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llvm-project/clang/lib/Sema/SemaChecking.cpp

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//===- SemaChecking.cpp - Extra Semantic Checking -------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file implements extra semantic analysis beyond what is enforced
// by the C type system.
//
//===----------------------------------------------------------------------===//
#include "clang/AST/APValue.h"
#include "clang/AST/ASTContext.h"
#include "clang/AST/Attr.h"
#include "clang/AST/AttrIterator.h"
#include "clang/AST/CharUnits.h"
#include "clang/AST/Decl.h"
#include "clang/AST/DeclBase.h"
#include "clang/AST/DeclCXX.h"
#include "clang/AST/DeclObjC.h"
#include "clang/AST/DeclarationName.h"
#include "clang/AST/EvaluatedExprVisitor.h"
#include "clang/AST/Expr.h"
#include "clang/AST/ExprCXX.h"
#include "clang/AST/ExprObjC.h"
#include "clang/AST/ExprOpenMP.h"
#include "clang/AST/FormatString.h"
#include "clang/AST/NSAPI.h"
#include "clang/AST/NonTrivialTypeVisitor.h"
#include "clang/AST/OperationKinds.h"
#include "clang/AST/RecordLayout.h"
#include "clang/AST/Stmt.h"
#include "clang/AST/TemplateBase.h"
#include "clang/AST/Type.h"
#include "clang/AST/TypeLoc.h"
#include "clang/AST/UnresolvedSet.h"
#include "clang/Basic/AddressSpaces.h"
#include "clang/Basic/CharInfo.h"
#include "clang/Basic/Diagnostic.h"
#include "clang/Basic/IdentifierTable.h"
#include "clang/Basic/LLVM.h"
#include "clang/Basic/LangOptions.h"
#include "clang/Basic/OpenCLOptions.h"
#include "clang/Basic/OperatorKinds.h"
#include "clang/Basic/PartialDiagnostic.h"
#include "clang/Basic/SourceLocation.h"
#include "clang/Basic/SourceManager.h"
#include "clang/Basic/Specifiers.h"
#include "clang/Basic/SyncScope.h"
#include "clang/Basic/TargetBuiltins.h"
#include "clang/Basic/TargetCXXABI.h"
#include "clang/Basic/TargetInfo.h"
#include "clang/Basic/TypeTraits.h"
#include "clang/Lex/Lexer.h" // TODO: Extract static functions to fix layering.
#include "clang/Sema/Initialization.h"
#include "clang/Sema/Lookup.h"
#include "clang/Sema/Ownership.h"
#include "clang/Sema/Scope.h"
#include "clang/Sema/ScopeInfo.h"
#include "clang/Sema/Sema.h"
#include "clang/Sema/SemaInternal.h"
#include "llvm/ADT/APFloat.h"
#include "llvm/ADT/APInt.h"
#include "llvm/ADT/APSInt.h"
#include "llvm/ADT/ArrayRef.h"
#include "llvm/ADT/DenseMap.h"
#include "llvm/ADT/FoldingSet.h"
#include "llvm/ADT/None.h"
#include "llvm/ADT/Optional.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/ADT/SmallBitVector.h"
#include "llvm/ADT/SmallPtrSet.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/ADT/StringSwitch.h"
#include "llvm/ADT/Triple.h"
#include "llvm/Support/AtomicOrdering.h"
#include "llvm/Support/Casting.h"
#include "llvm/Support/Compiler.h"
#include "llvm/Support/ConvertUTF.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/Format.h"
#include "llvm/Support/Locale.h"
#include "llvm/Support/MathExtras.h"
#include "llvm/Support/SaveAndRestore.h"
#include "llvm/Support/raw_ostream.h"
#include <algorithm>
#include <bitset>
#include <cassert>
#include <cstddef>
#include <cstdint>
#include <functional>
#include <limits>
#include <string>
#include <tuple>
#include <utility>
using namespace clang;
using namespace sema;
SourceLocation Sema::getLocationOfStringLiteralByte(const StringLiteral *SL,
unsigned ByteNo) const {
return SL->getLocationOfByte(ByteNo, getSourceManager(), LangOpts,
Context.getTargetInfo());
}
/// Checks that a call expression's argument count is the desired number.
/// This is useful when doing custom type-checking. Returns true on error.
static bool checkArgCount(Sema &S, CallExpr *call, unsigned desiredArgCount) {
unsigned argCount = call->getNumArgs();
if (argCount == desiredArgCount) return false;
if (argCount < desiredArgCount)
return S.Diag(call->getEndLoc(), diag::err_typecheck_call_too_few_args)
<< 0 /*function call*/ << desiredArgCount << argCount
<< call->getSourceRange();
// Highlight all the excess arguments.
SourceRange range(call->getArg(desiredArgCount)->getBeginLoc(),
call->getArg(argCount - 1)->getEndLoc());
return S.Diag(range.getBegin(), diag::err_typecheck_call_too_many_args)
<< 0 /*function call*/ << desiredArgCount << argCount
<< call->getArg(1)->getSourceRange();
}
/// Check that the first argument to __builtin_annotation is an integer
/// and the second argument is a non-wide string literal.
static bool SemaBuiltinAnnotation(Sema &S, CallExpr *TheCall) {
if (checkArgCount(S, TheCall, 2))
return true;
// First argument should be an integer.
Expr *ValArg = TheCall->getArg(0);
QualType Ty = ValArg->getType();
if (!Ty->isIntegerType()) {
S.Diag(ValArg->getBeginLoc(), diag::err_builtin_annotation_first_arg)
<< ValArg->getSourceRange();
return true;
}
// Second argument should be a constant string.
Expr *StrArg = TheCall->getArg(1)->IgnoreParenCasts();
StringLiteral *Literal = dyn_cast<StringLiteral>(StrArg);
if (!Literal || !Literal->isAscii()) {
S.Diag(StrArg->getBeginLoc(), diag::err_builtin_annotation_second_arg)
<< StrArg->getSourceRange();
return true;
}
TheCall->setType(Ty);
return false;
}
static bool SemaBuiltinMSVCAnnotation(Sema &S, CallExpr *TheCall) {
// We need at least one argument.
if (TheCall->getNumArgs() < 1) {
S.Diag(TheCall->getEndLoc(), diag::err_typecheck_call_too_few_args_at_least)
<< 0 << 1 << TheCall->getNumArgs()
<< TheCall->getCallee()->getSourceRange();
return true;
}
// All arguments should be wide string literals.
for (Expr *Arg : TheCall->arguments()) {
auto *Literal = dyn_cast<StringLiteral>(Arg->IgnoreParenCasts());
if (!Literal || !Literal->isWide()) {
S.Diag(Arg->getBeginLoc(), diag::err_msvc_annotation_wide_str)
<< Arg->getSourceRange();
return true;
}
}
return false;
}
/// Check that the argument to __builtin_addressof is a glvalue, and set the
/// result type to the corresponding pointer type.
static bool SemaBuiltinAddressof(Sema &S, CallExpr *TheCall) {
if (checkArgCount(S, TheCall, 1))
return true;
ExprResult Arg(TheCall->getArg(0));
QualType ResultType = S.CheckAddressOfOperand(Arg, TheCall->getBeginLoc());
if (ResultType.isNull())
return true;
TheCall->setArg(0, Arg.get());
TheCall->setType(ResultType);
return false;
}
/// Check the number of arguments and set the result type to
/// the argument type.
static bool SemaBuiltinPreserveAI(Sema &S, CallExpr *TheCall) {
if (checkArgCount(S, TheCall, 1))
return true;
TheCall->setType(TheCall->getArg(0)->getType());
return false;
}
/// Check that the value argument for __builtin_is_aligned(value, alignment) and
/// __builtin_aligned_{up,down}(value, alignment) is an integer or a pointer
/// type (but not a function pointer) and that the alignment is a power-of-two.
static bool SemaBuiltinAlignment(Sema &S, CallExpr *TheCall, unsigned ID) {
if (checkArgCount(S, TheCall, 2))
return true;
clang::Expr *Source = TheCall->getArg(0);
bool IsBooleanAlignBuiltin = ID == Builtin::BI__builtin_is_aligned;
auto IsValidIntegerType = [](QualType Ty) {
return Ty->isIntegerType() && !Ty->isEnumeralType() && !Ty->isBooleanType();
};
QualType SrcTy = Source->getType();
// We should also be able to use it with arrays (but not functions!).
if (SrcTy->canDecayToPointerType() && SrcTy->isArrayType()) {
SrcTy = S.Context.getDecayedType(SrcTy);
}
if ((!SrcTy->isPointerType() && !IsValidIntegerType(SrcTy)) ||
SrcTy->isFunctionPointerType()) {
// FIXME: this is not quite the right error message since we don't allow
// floating point types, or member pointers.
S.Diag(Source->getExprLoc(), diag::err_typecheck_expect_scalar_operand)
<< SrcTy;
return true;
}
clang::Expr *AlignOp = TheCall->getArg(1);
if (!IsValidIntegerType(AlignOp->getType())) {
S.Diag(AlignOp->getExprLoc(), diag::err_typecheck_expect_int)
<< AlignOp->getType();
return true;
}
Expr::EvalResult AlignResult;
unsigned MaxAlignmentBits = S.Context.getIntWidth(SrcTy) - 1;
// We can't check validity of alignment if it is value dependent.
if (!AlignOp->isValueDependent() &&
AlignOp->EvaluateAsInt(AlignResult, S.Context,
Expr::SE_AllowSideEffects)) {
llvm::APSInt AlignValue = AlignResult.Val.getInt();
llvm::APSInt MaxValue(
llvm::APInt::getOneBitSet(MaxAlignmentBits + 1, MaxAlignmentBits));
if (AlignValue < 1) {
S.Diag(AlignOp->getExprLoc(), diag::err_alignment_too_small) << 1;
return true;
}
if (llvm::APSInt::compareValues(AlignValue, MaxValue) > 0) {
S.Diag(AlignOp->getExprLoc(), diag::err_alignment_too_big)
<< MaxValue.toString(10);
return true;
}
if (!AlignValue.isPowerOf2()) {
S.Diag(AlignOp->getExprLoc(), diag::err_alignment_not_power_of_two);
return true;
}
if (AlignValue == 1) {
S.Diag(AlignOp->getExprLoc(), diag::warn_alignment_builtin_useless)
<< IsBooleanAlignBuiltin;
}
}
ExprResult SrcArg = S.PerformCopyInitialization(
InitializedEntity::InitializeParameter(S.Context, SrcTy, false),
SourceLocation(), Source);
if (SrcArg.isInvalid())
return true;
TheCall->setArg(0, SrcArg.get());
ExprResult AlignArg =
S.PerformCopyInitialization(InitializedEntity::InitializeParameter(
S.Context, AlignOp->getType(), false),
SourceLocation(), AlignOp);
if (AlignArg.isInvalid())
return true;
TheCall->setArg(1, AlignArg.get());
// For align_up/align_down, the return type is the same as the (potentially
// decayed) argument type including qualifiers. For is_aligned(), the result
// is always bool.
TheCall->setType(IsBooleanAlignBuiltin ? S.Context.BoolTy : SrcTy);
return false;
}
static bool SemaBuiltinOverflow(Sema &S, CallExpr *TheCall,
unsigned BuiltinID) {
if (checkArgCount(S, TheCall, 3))
return true;
// First two arguments should be integers.
for (unsigned I = 0; I < 2; ++I) {
ExprResult Arg = S.DefaultFunctionArrayLvalueConversion(TheCall->getArg(I));
if (Arg.isInvalid()) return true;
TheCall->setArg(I, Arg.get());
QualType Ty = Arg.get()->getType();
if (!Ty->isIntegerType()) {
S.Diag(Arg.get()->getBeginLoc(), diag::err_overflow_builtin_must_be_int)
<< Ty << Arg.get()->getSourceRange();
return true;
}
}
// Third argument should be a pointer to a non-const integer.
// IRGen correctly handles volatile, restrict, and address spaces, and
// the other qualifiers aren't possible.
{
ExprResult Arg = S.DefaultFunctionArrayLvalueConversion(TheCall->getArg(2));
if (Arg.isInvalid()) return true;
TheCall->setArg(2, Arg.get());
QualType Ty = Arg.get()->getType();
const auto *PtrTy = Ty->getAs<PointerType>();
if (!PtrTy ||
!PtrTy->getPointeeType()->isIntegerType() ||
PtrTy->getPointeeType().isConstQualified()) {
S.Diag(Arg.get()->getBeginLoc(),
diag::err_overflow_builtin_must_be_ptr_int)
<< Ty << Arg.get()->getSourceRange();
return true;
}
}
// Disallow signed ExtIntType args larger than 128 bits to mul function until
// we improve backend support.
if (BuiltinID == Builtin::BI__builtin_mul_overflow) {
for (unsigned I = 0; I < 3; ++I) {
const auto Arg = TheCall->getArg(I);
// Third argument will be a pointer.
auto Ty = I < 2 ? Arg->getType() : Arg->getType()->getPointeeType();
if (Ty->isExtIntType() && Ty->isSignedIntegerType() &&
S.getASTContext().getIntWidth(Ty) > 128)
return S.Diag(Arg->getBeginLoc(),
diag::err_overflow_builtin_ext_int_max_size)
<< 128;
}
}
return false;
}
static bool SemaBuiltinCallWithStaticChain(Sema &S, CallExpr *BuiltinCall) {
if (checkArgCount(S, BuiltinCall, 2))
return true;
SourceLocation BuiltinLoc = BuiltinCall->getBeginLoc();
Expr *Builtin = BuiltinCall->getCallee()->IgnoreImpCasts();
Expr *Call = BuiltinCall->getArg(0);
Expr *Chain = BuiltinCall->getArg(1);
if (Call->getStmtClass() != Stmt::CallExprClass) {
S.Diag(BuiltinLoc, diag::err_first_argument_to_cwsc_not_call)
<< Call->getSourceRange();
return true;
}
auto CE = cast<CallExpr>(Call);
if (CE->getCallee()->getType()->isBlockPointerType()) {
S.Diag(BuiltinLoc, diag::err_first_argument_to_cwsc_block_call)
<< Call->getSourceRange();
return true;
}
const Decl *TargetDecl = CE->getCalleeDecl();
if (const FunctionDecl *FD = dyn_cast_or_null<FunctionDecl>(TargetDecl))
if (FD->getBuiltinID()) {
S.Diag(BuiltinLoc, diag::err_first_argument_to_cwsc_builtin_call)
<< Call->getSourceRange();
return true;
}
if (isa<CXXPseudoDestructorExpr>(CE->getCallee()->IgnoreParens())) {
S.Diag(BuiltinLoc, diag::err_first_argument_to_cwsc_pdtor_call)
<< Call->getSourceRange();
return true;
}
ExprResult ChainResult = S.UsualUnaryConversions(Chain);
if (ChainResult.isInvalid())
return true;
if (!ChainResult.get()->getType()->isPointerType()) {
S.Diag(BuiltinLoc, diag::err_second_argument_to_cwsc_not_pointer)
<< Chain->getSourceRange();
return true;
}
QualType ReturnTy = CE->getCallReturnType(S.Context);
QualType ArgTys[2] = { ReturnTy, ChainResult.get()->getType() };
QualType BuiltinTy = S.Context.getFunctionType(
ReturnTy, ArgTys, FunctionProtoType::ExtProtoInfo());
QualType BuiltinPtrTy = S.Context.getPointerType(BuiltinTy);
Builtin =
S.ImpCastExprToType(Builtin, BuiltinPtrTy, CK_BuiltinFnToFnPtr).get();
BuiltinCall->setType(CE->getType());
BuiltinCall->setValueKind(CE->getValueKind());
BuiltinCall->setObjectKind(CE->getObjectKind());
BuiltinCall->setCallee(Builtin);
BuiltinCall->setArg(1, ChainResult.get());
return false;
}
namespace {
class EstimateSizeFormatHandler
: public analyze_format_string::FormatStringHandler {
size_t Size;
public:
EstimateSizeFormatHandler(StringRef Format)
: Size(std::min(Format.find(0), Format.size()) +
1 /* null byte always written by sprintf */) {}
bool HandlePrintfSpecifier(const analyze_printf::PrintfSpecifier &FS,
const char *, unsigned SpecifierLen) override {
const size_t FieldWidth = computeFieldWidth(FS);
const size_t Precision = computePrecision(FS);
// The actual format.
switch (FS.getConversionSpecifier().getKind()) {
// Just a char.
case analyze_format_string::ConversionSpecifier::cArg:
case analyze_format_string::ConversionSpecifier::CArg:
Size += std::max(FieldWidth, (size_t)1);
break;
// Just an integer.
case analyze_format_string::ConversionSpecifier::dArg:
case analyze_format_string::ConversionSpecifier::DArg:
case analyze_format_string::ConversionSpecifier::iArg:
case analyze_format_string::ConversionSpecifier::oArg:
case analyze_format_string::ConversionSpecifier::OArg:
case analyze_format_string::ConversionSpecifier::uArg:
case analyze_format_string::ConversionSpecifier::UArg:
case analyze_format_string::ConversionSpecifier::xArg:
case analyze_format_string::ConversionSpecifier::XArg:
Size += std::max(FieldWidth, Precision);
break;
// %g style conversion switches between %f or %e style dynamically.
// %f always takes less space, so default to it.
case analyze_format_string::ConversionSpecifier::gArg:
case analyze_format_string::ConversionSpecifier::GArg:
// Floating point number in the form '[+]ddd.ddd'.
case analyze_format_string::ConversionSpecifier::fArg:
case analyze_format_string::ConversionSpecifier::FArg:
Size += std::max(FieldWidth, 1 /* integer part */ +
(Precision ? 1 + Precision
: 0) /* period + decimal */);
break;
// Floating point number in the form '[-]d.ddde[+-]dd'.
case analyze_format_string::ConversionSpecifier::eArg:
case analyze_format_string::ConversionSpecifier::EArg:
Size +=
std::max(FieldWidth,
1 /* integer part */ +
(Precision ? 1 + Precision : 0) /* period + decimal */ +
1 /* e or E letter */ + 2 /* exponent */);
break;
// Floating point number in the form '[-]0xh.hhhhp±dd'.
case analyze_format_string::ConversionSpecifier::aArg:
case analyze_format_string::ConversionSpecifier::AArg:
Size +=
std::max(FieldWidth,
2 /* 0x */ + 1 /* integer part */ +
(Precision ? 1 + Precision : 0) /* period + decimal */ +
1 /* p or P letter */ + 1 /* + or - */ + 1 /* value */);
break;
// Just a string.
case analyze_format_string::ConversionSpecifier::sArg:
case analyze_format_string::ConversionSpecifier::SArg:
Size += FieldWidth;
break;
// Just a pointer in the form '0xddd'.
case analyze_format_string::ConversionSpecifier::pArg:
Size += std::max(FieldWidth, 2 /* leading 0x */ + Precision);
break;
// A plain percent.
case analyze_format_string::ConversionSpecifier::PercentArg:
Size += 1;
break;
default:
break;
}
Size += FS.hasPlusPrefix() || FS.hasSpacePrefix();
if (FS.hasAlternativeForm()) {
switch (FS.getConversionSpecifier().getKind()) {
default:
break;
// Force a leading '0'.
case analyze_format_string::ConversionSpecifier::oArg:
Size += 1;
break;
// Force a leading '0x'.
case analyze_format_string::ConversionSpecifier::xArg:
case analyze_format_string::ConversionSpecifier::XArg:
Size += 2;
break;
// Force a period '.' before decimal, even if precision is 0.
case analyze_format_string::ConversionSpecifier::aArg:
case analyze_format_string::ConversionSpecifier::AArg:
case analyze_format_string::ConversionSpecifier::eArg:
case analyze_format_string::ConversionSpecifier::EArg:
case analyze_format_string::ConversionSpecifier::fArg:
case analyze_format_string::ConversionSpecifier::FArg:
case analyze_format_string::ConversionSpecifier::gArg:
case analyze_format_string::ConversionSpecifier::GArg:
Size += (Precision ? 0 : 1);
break;
}
}
assert(SpecifierLen <= Size && "no underflow");
Size -= SpecifierLen;
return true;
}
size_t getSizeLowerBound() const { return Size; }
private:
static size_t computeFieldWidth(const analyze_printf::PrintfSpecifier &FS) {
const analyze_format_string::OptionalAmount &FW = FS.getFieldWidth();
size_t FieldWidth = 0;
if (FW.getHowSpecified() == analyze_format_string::OptionalAmount::Constant)
FieldWidth = FW.getConstantAmount();
return FieldWidth;
}
static size_t computePrecision(const analyze_printf::PrintfSpecifier &FS) {
const analyze_format_string::OptionalAmount &FW = FS.getPrecision();
size_t Precision = 0;
// See man 3 printf for default precision value based on the specifier.
switch (FW.getHowSpecified()) {
case analyze_format_string::OptionalAmount::NotSpecified:
switch (FS.getConversionSpecifier().getKind()) {
default:
break;
case analyze_format_string::ConversionSpecifier::dArg: // %d
case analyze_format_string::ConversionSpecifier::DArg: // %D
case analyze_format_string::ConversionSpecifier::iArg: // %i
Precision = 1;
break;
case analyze_format_string::ConversionSpecifier::oArg: // %d
case analyze_format_string::ConversionSpecifier::OArg: // %D
case analyze_format_string::ConversionSpecifier::uArg: // %d
case analyze_format_string::ConversionSpecifier::UArg: // %D
case analyze_format_string::ConversionSpecifier::xArg: // %d
case analyze_format_string::ConversionSpecifier::XArg: // %D
Precision = 1;
break;
case analyze_format_string::ConversionSpecifier::fArg: // %f
case analyze_format_string::ConversionSpecifier::FArg: // %F
case analyze_format_string::ConversionSpecifier::eArg: // %e
case analyze_format_string::ConversionSpecifier::EArg: // %E
case analyze_format_string::ConversionSpecifier::gArg: // %g
case analyze_format_string::ConversionSpecifier::GArg: // %G
Precision = 6;
break;
case analyze_format_string::ConversionSpecifier::pArg: // %d
Precision = 1;
break;
}
break;
case analyze_format_string::OptionalAmount::Constant:
Precision = FW.getConstantAmount();
break;
default:
break;
}
return Precision;
}
};
} // namespace
/// Check a call to BuiltinID for buffer overflows. If BuiltinID is a
/// __builtin_*_chk function, then use the object size argument specified in the
/// source. Otherwise, infer the object size using __builtin_object_size.
void Sema::checkFortifiedBuiltinMemoryFunction(FunctionDecl *FD,
CallExpr *TheCall) {
// FIXME: There are some more useful checks we could be doing here:
// - Evaluate strlen of strcpy arguments, use as object size.
if (TheCall->isValueDependent() || TheCall->isTypeDependent() ||
isConstantEvaluated())
return;
unsigned BuiltinID = FD->getBuiltinID(/*ConsiderWrappers=*/true);
if (!BuiltinID)
return;
const TargetInfo &TI = getASTContext().getTargetInfo();
unsigned SizeTypeWidth = TI.getTypeWidth(TI.getSizeType());
unsigned DiagID = 0;
bool IsChkVariant = false;
Optional<llvm::APSInt> UsedSize;
unsigned SizeIndex, ObjectIndex;
switch (BuiltinID) {
default:
return;
case Builtin::BIsprintf:
case Builtin::BI__builtin___sprintf_chk: {
size_t FormatIndex = BuiltinID == Builtin::BIsprintf ? 1 : 3;
auto *FormatExpr = TheCall->getArg(FormatIndex)->IgnoreParenImpCasts();
if (auto *Format = dyn_cast<StringLiteral>(FormatExpr)) {
if (!Format->isAscii() && !Format->isUTF8())
return;
StringRef FormatStrRef = Format->getString();
EstimateSizeFormatHandler H(FormatStrRef);
const char *FormatBytes = FormatStrRef.data();
const ConstantArrayType *T =
Context.getAsConstantArrayType(Format->getType());
assert(T && "String literal not of constant array type!");
size_t TypeSize = T->getSize().getZExtValue();
// In case there's a null byte somewhere.
size_t StrLen =
std::min(std::max(TypeSize, size_t(1)) - 1, FormatStrRef.find(0));
if (!analyze_format_string::ParsePrintfString(
H, FormatBytes, FormatBytes + StrLen, getLangOpts(),
Context.getTargetInfo(), false)) {
DiagID = diag::warn_fortify_source_format_overflow;
UsedSize = llvm::APSInt::getUnsigned(H.getSizeLowerBound())
.extOrTrunc(SizeTypeWidth);
if (BuiltinID == Builtin::BI__builtin___sprintf_chk) {
IsChkVariant = true;
ObjectIndex = 2;
} else {
IsChkVariant = false;
ObjectIndex = 0;
}
break;
}
}
return;
}
case Builtin::BI__builtin___memcpy_chk:
case Builtin::BI__builtin___memmove_chk:
case Builtin::BI__builtin___memset_chk:
case Builtin::BI__builtin___strlcat_chk:
case Builtin::BI__builtin___strlcpy_chk:
case Builtin::BI__builtin___strncat_chk:
case Builtin::BI__builtin___strncpy_chk:
case Builtin::BI__builtin___stpncpy_chk:
case Builtin::BI__builtin___memccpy_chk:
case Builtin::BI__builtin___mempcpy_chk: {
DiagID = diag::warn_builtin_chk_overflow;
IsChkVariant = true;
SizeIndex = TheCall->getNumArgs() - 2;
ObjectIndex = TheCall->getNumArgs() - 1;
break;
}
case Builtin::BI__builtin___snprintf_chk:
case Builtin::BI__builtin___vsnprintf_chk: {
DiagID = diag::warn_builtin_chk_overflow;
IsChkVariant = true;
SizeIndex = 1;
ObjectIndex = 3;
break;
}
case Builtin::BIstrncat:
case Builtin::BI__builtin_strncat:
case Builtin::BIstrncpy:
case Builtin::BI__builtin_strncpy:
case Builtin::BIstpncpy:
case Builtin::BI__builtin_stpncpy: {
// Whether these functions overflow depends on the runtime strlen of the
// string, not just the buffer size, so emitting the "always overflow"
// diagnostic isn't quite right. We should still diagnose passing a buffer
// size larger than the destination buffer though; this is a runtime abort
// in _FORTIFY_SOURCE mode, and is quite suspicious otherwise.
DiagID = diag::warn_fortify_source_size_mismatch;
SizeIndex = TheCall->getNumArgs() - 1;
ObjectIndex = 0;
break;
}
case Builtin::BImemcpy:
case Builtin::BI__builtin_memcpy:
case Builtin::BImemmove:
case Builtin::BI__builtin_memmove:
case Builtin::BImemset:
case Builtin::BI__builtin_memset:
case Builtin::BImempcpy:
case Builtin::BI__builtin_mempcpy: {
DiagID = diag::warn_fortify_source_overflow;
SizeIndex = TheCall->getNumArgs() - 1;
ObjectIndex = 0;
break;
}
case Builtin::BIsnprintf:
case Builtin::BI__builtin_snprintf:
case Builtin::BIvsnprintf:
case Builtin::BI__builtin_vsnprintf: {
DiagID = diag::warn_fortify_source_size_mismatch;
SizeIndex = 1;
ObjectIndex = 0;
break;
}
}
llvm::APSInt ObjectSize;
// For __builtin___*_chk, the object size is explicitly provided by the caller
// (usually using __builtin_object_size). Use that value to check this call.
if (IsChkVariant) {
Expr::EvalResult Result;
Expr *SizeArg = TheCall->getArg(ObjectIndex);
if (!SizeArg->EvaluateAsInt(Result, getASTContext()))
return;
ObjectSize = Result.Val.getInt();
// Otherwise, try to evaluate an imaginary call to __builtin_object_size.
} else {
// If the parameter has a pass_object_size attribute, then we should use its
// (potentially) more strict checking mode. Otherwise, conservatively assume
// type 0.
int BOSType = 0;
if (const auto *POS =
FD->getParamDecl(ObjectIndex)->getAttr<PassObjectSizeAttr>())
BOSType = POS->getType();
Expr *ObjArg = TheCall->getArg(ObjectIndex);
uint64_t Result;
if (!ObjArg->tryEvaluateObjectSize(Result, getASTContext(), BOSType))
return;
// Get the object size in the target's size_t width.
ObjectSize = llvm::APSInt::getUnsigned(Result).extOrTrunc(SizeTypeWidth);
}
// Evaluate the number of bytes of the object that this call will use.
if (!UsedSize) {
Expr::EvalResult Result;
Expr *UsedSizeArg = TheCall->getArg(SizeIndex);
if (!UsedSizeArg->EvaluateAsInt(Result, getASTContext()))
return;
UsedSize = Result.Val.getInt().extOrTrunc(SizeTypeWidth);
}
if (UsedSize.getValue().ule(ObjectSize))
return;
StringRef FunctionName = getASTContext().BuiltinInfo.getName(BuiltinID);
// Skim off the details of whichever builtin was called to produce a better
// diagnostic, as it's unlikley that the user wrote the __builtin explicitly.
if (IsChkVariant) {
FunctionName = FunctionName.drop_front(std::strlen("__builtin___"));
FunctionName = FunctionName.drop_back(std::strlen("_chk"));
} else if (FunctionName.startswith("__builtin_")) {
FunctionName = FunctionName.drop_front(std::strlen("__builtin_"));
}
DiagRuntimeBehavior(TheCall->getBeginLoc(), TheCall,
PDiag(DiagID)
<< FunctionName << ObjectSize.toString(/*Radix=*/10)
<< UsedSize.getValue().toString(/*Radix=*/10));
}
static bool SemaBuiltinSEHScopeCheck(Sema &SemaRef, CallExpr *TheCall,
Scope::ScopeFlags NeededScopeFlags,
unsigned DiagID) {
// Scopes aren't available during instantiation. Fortunately, builtin
// functions cannot be template args so they cannot be formed through template
// instantiation. Therefore checking once during the parse is sufficient.
if (SemaRef.inTemplateInstantiation())
return false;
Scope *S = SemaRef.getCurScope();
while (S && !S->isSEHExceptScope())
S = S->getParent();
if (!S || !(S->getFlags() & NeededScopeFlags)) {
auto *DRE = cast<DeclRefExpr>(TheCall->getCallee()->IgnoreParenCasts());
SemaRef.Diag(TheCall->getExprLoc(), DiagID)
<< DRE->getDecl()->getIdentifier();
return true;
}
return false;
}
static inline bool isBlockPointer(Expr *Arg) {
return Arg->getType()->isBlockPointerType();
}
/// OpenCL C v2.0, s6.13.17.2 - Checks that the block parameters are all local
/// void*, which is a requirement of device side enqueue.
static bool checkOpenCLBlockArgs(Sema &S, Expr *BlockArg) {
const BlockPointerType *BPT =
cast<BlockPointerType>(BlockArg->getType().getCanonicalType());
ArrayRef<QualType> Params =
BPT->getPointeeType()->castAs<FunctionProtoType>()->getParamTypes();
unsigned ArgCounter = 0;
bool IllegalParams = false;
// Iterate through the block parameters until either one is found that is not
// a local void*, or the block is valid.
for (ArrayRef<QualType>::iterator I = Params.begin(), E = Params.end();
I != E; ++I, ++ArgCounter) {
if (!(*I)->isPointerType() || !(*I)->getPointeeType()->isVoidType() ||
(*I)->getPointeeType().getQualifiers().getAddressSpace() !=
LangAS::opencl_local) {
// Get the location of the error. If a block literal has been passed
// (BlockExpr) then we can point straight to the offending argument,
// else we just point to the variable reference.
SourceLocation ErrorLoc;
if (isa<BlockExpr>(BlockArg)) {
BlockDecl *BD = cast<BlockExpr>(BlockArg)->getBlockDecl();
ErrorLoc = BD->getParamDecl(ArgCounter)->getBeginLoc();
} else if (isa<DeclRefExpr>(BlockArg)) {
ErrorLoc = cast<DeclRefExpr>(BlockArg)->getBeginLoc();
}
S.Diag(ErrorLoc,
diag::err_opencl_enqueue_kernel_blocks_non_local_void_args);
IllegalParams = true;
}
}
return IllegalParams;
}
static bool checkOpenCLSubgroupExt(Sema &S, CallExpr *Call) {
if (!S.getOpenCLOptions().isEnabled("cl_khr_subgroups")) {
S.Diag(Call->getBeginLoc(), diag::err_opencl_requires_extension)
<< 1 << Call->getDirectCallee() << "cl_khr_subgroups";
return true;
}
return false;
}
static bool SemaOpenCLBuiltinNDRangeAndBlock(Sema &S, CallExpr *TheCall) {
if (checkArgCount(S, TheCall, 2))
return true;
if (checkOpenCLSubgroupExt(S, TheCall))
return true;
// First argument is an ndrange_t type.
Expr *NDRangeArg = TheCall->getArg(0);
if (NDRangeArg->getType().getUnqualifiedType().getAsString() != "ndrange_t") {
S.Diag(NDRangeArg->getBeginLoc(), diag::err_opencl_builtin_expected_type)
<< TheCall->getDirectCallee() << "'ndrange_t'";
return true;
}
Expr *BlockArg = TheCall->getArg(1);
if (!isBlockPointer(BlockArg)) {
S.Diag(BlockArg->getBeginLoc(), diag::err_opencl_builtin_expected_type)
<< TheCall->getDirectCallee() << "block";
return true;
}
return checkOpenCLBlockArgs(S, BlockArg);
}
/// OpenCL C v2.0, s6.13.17.6 - Check the argument to the
/// get_kernel_work_group_size
/// and get_kernel_preferred_work_group_size_multiple builtin functions.
static bool SemaOpenCLBuiltinKernelWorkGroupSize(Sema &S, CallExpr *TheCall) {
if (checkArgCount(S, TheCall, 1))
return true;
Expr *BlockArg = TheCall->getArg(0);
if (!isBlockPointer(BlockArg)) {
S.Diag(BlockArg->getBeginLoc(), diag::err_opencl_builtin_expected_type)
<< TheCall->getDirectCallee() << "block";
return true;
}
return checkOpenCLBlockArgs(S, BlockArg);
}
/// Diagnose integer type and any valid implicit conversion to it.
static bool checkOpenCLEnqueueIntType(Sema &S, Expr *E,
const QualType &IntType);
static bool checkOpenCLEnqueueLocalSizeArgs(Sema &S, CallExpr *TheCall,
unsigned Start, unsigned End) {
bool IllegalParams = false;
for (unsigned I = Start; I <= End; ++I)
IllegalParams |= checkOpenCLEnqueueIntType(S, TheCall->getArg(I),
S.Context.getSizeType());
return IllegalParams;
}
/// OpenCL v2.0, s6.13.17.1 - Check that sizes are provided for all
/// 'local void*' parameter of passed block.
static bool checkOpenCLEnqueueVariadicArgs(Sema &S, CallExpr *TheCall,
Expr *BlockArg,
unsigned NumNonVarArgs) {
const BlockPointerType *BPT =
cast<BlockPointerType>(BlockArg->getType().getCanonicalType());
unsigned NumBlockParams =
BPT->getPointeeType()->castAs<FunctionProtoType>()->getNumParams();
unsigned TotalNumArgs = TheCall->getNumArgs();
// For each argument passed to the block, a corresponding uint needs to
// be passed to describe the size of the local memory.
if (TotalNumArgs != NumBlockParams + NumNonVarArgs) {
S.Diag(TheCall->getBeginLoc(),
diag::err_opencl_enqueue_kernel_local_size_args);
return true;
}
// Check that the sizes of the local memory are specified by integers.
return checkOpenCLEnqueueLocalSizeArgs(S, TheCall, NumNonVarArgs,
TotalNumArgs - 1);
}
/// OpenCL C v2.0, s6.13.17 - Enqueue kernel function contains four different
/// overload formats specified in Table 6.13.17.1.
/// int enqueue_kernel(queue_t queue,
/// kernel_enqueue_flags_t flags,
/// const ndrange_t ndrange,
/// void (^block)(void))
/// int enqueue_kernel(queue_t queue,
/// kernel_enqueue_flags_t flags,
/// const ndrange_t ndrange,
/// uint num_events_in_wait_list,
/// clk_event_t *event_wait_list,
/// clk_event_t *event_ret,
/// void (^block)(void))
/// int enqueue_kernel(queue_t queue,
/// kernel_enqueue_flags_t flags,
/// const ndrange_t ndrange,
/// void (^block)(local void*, ...),
/// uint size0, ...)
/// int enqueue_kernel(queue_t queue,
/// kernel_enqueue_flags_t flags,
/// const ndrange_t ndrange,
/// uint num_events_in_wait_list,
/// clk_event_t *event_wait_list,
/// clk_event_t *event_ret,
/// void (^block)(local void*, ...),
/// uint size0, ...)
static bool SemaOpenCLBuiltinEnqueueKernel(Sema &S, CallExpr *TheCall) {
unsigned NumArgs = TheCall->getNumArgs();
if (NumArgs < 4) {
S.Diag(TheCall->getBeginLoc(),
diag::err_typecheck_call_too_few_args_at_least)
<< 0 << 4 << NumArgs;
return true;
}
Expr *Arg0 = TheCall->getArg(0);
Expr *Arg1 = TheCall->getArg(1);
Expr *Arg2 = TheCall->getArg(2);
Expr *Arg3 = TheCall->getArg(3);
// First argument always needs to be a queue_t type.
if (!Arg0->getType()->isQueueT()) {
S.Diag(TheCall->getArg(0)->getBeginLoc(),
diag::err_opencl_builtin_expected_type)
<< TheCall->getDirectCallee() << S.Context.OCLQueueTy;
return true;
}
// Second argument always needs to be a kernel_enqueue_flags_t enum value.
if (!Arg1->getType()->isIntegerType()) {
S.Diag(TheCall->getArg(1)->getBeginLoc(),
diag::err_opencl_builtin_expected_type)
<< TheCall->getDirectCallee() << "'kernel_enqueue_flags_t' (i.e. uint)";
return true;
}
// Third argument is always an ndrange_t type.
if (Arg2->getType().getUnqualifiedType().getAsString() != "ndrange_t") {
S.Diag(TheCall->getArg(2)->getBeginLoc(),
diag::err_opencl_builtin_expected_type)
<< TheCall->getDirectCallee() << "'ndrange_t'";
return true;
}
// With four arguments, there is only one form that the function could be
// called in: no events and no variable arguments.
if (NumArgs == 4) {
// check that the last argument is the right block type.
if (!isBlockPointer(Arg3)) {
S.Diag(Arg3->getBeginLoc(), diag::err_opencl_builtin_expected_type)
<< TheCall->getDirectCallee() << "block";
return true;
}
// we have a block type, check the prototype
const BlockPointerType *BPT =
cast<BlockPointerType>(Arg3->getType().getCanonicalType());
if (BPT->getPointeeType()->castAs<FunctionProtoType>()->getNumParams() > 0) {
S.Diag(Arg3->getBeginLoc(),
diag::err_opencl_enqueue_kernel_blocks_no_args);
return true;
}
return false;
}
// we can have block + varargs.
if (isBlockPointer(Arg3))
return (checkOpenCLBlockArgs(S, Arg3) ||
checkOpenCLEnqueueVariadicArgs(S, TheCall, Arg3, 4));
// last two cases with either exactly 7 args or 7 args and varargs.
if (NumArgs >= 7) {
// check common block argument.
Expr *Arg6 = TheCall->getArg(6);
if (!isBlockPointer(Arg6)) {
S.Diag(Arg6->getBeginLoc(), diag::err_opencl_builtin_expected_type)
<< TheCall->getDirectCallee() << "block";
return true;
}
if (checkOpenCLBlockArgs(S, Arg6))
return true;
// Forth argument has to be any integer type.
if (!Arg3->getType()->isIntegerType()) {
S.Diag(TheCall->getArg(3)->getBeginLoc(),
diag::err_opencl_builtin_expected_type)
<< TheCall->getDirectCallee() << "integer";
return true;
}
// check remaining common arguments.
Expr *Arg4 = TheCall->getArg(4);
Expr *Arg5 = TheCall->getArg(5);
// Fifth argument is always passed as a pointer to clk_event_t.
if (!Arg4->isNullPointerConstant(S.Context,
Expr::NPC_ValueDependentIsNotNull) &&
!Arg4->getType()->getPointeeOrArrayElementType()->isClkEventT()) {
S.Diag(TheCall->getArg(4)->getBeginLoc(),
diag::err_opencl_builtin_expected_type)
<< TheCall->getDirectCallee()
<< S.Context.getPointerType(S.Context.OCLClkEventTy);
return true;
}
// Sixth argument is always passed as a pointer to clk_event_t.
if (!Arg5->isNullPointerConstant(S.Context,
Expr::NPC_ValueDependentIsNotNull) &&
!(Arg5->getType()->isPointerType() &&
Arg5->getType()->getPointeeType()->isClkEventT())) {
S.Diag(TheCall->getArg(5)->getBeginLoc(),
diag::err_opencl_builtin_expected_type)
<< TheCall->getDirectCallee()
<< S.Context.getPointerType(S.Context.OCLClkEventTy);
return true;
}
if (NumArgs == 7)
return false;
return checkOpenCLEnqueueVariadicArgs(S, TheCall, Arg6, 7);
}
// None of the specific case has been detected, give generic error
S.Diag(TheCall->getBeginLoc(),
diag::err_opencl_enqueue_kernel_incorrect_args);
return true;
}
/// Returns OpenCL access qual.
static OpenCLAccessAttr *getOpenCLArgAccess(const Decl *D) {
return D->getAttr<OpenCLAccessAttr>();
}
/// Returns true if pipe element type is different from the pointer.
static bool checkOpenCLPipeArg(Sema &S, CallExpr *Call) {
const Expr *Arg0 = Call->getArg(0);
// First argument type should always be pipe.
if (!Arg0->getType()->isPipeType()) {
S.Diag(Call->getBeginLoc(), diag::err_opencl_builtin_pipe_first_arg)
<< Call->getDirectCallee() << Arg0->getSourceRange();
return true;
}
OpenCLAccessAttr *AccessQual =
getOpenCLArgAccess(cast<DeclRefExpr>(Arg0)->getDecl());
// Validates the access qualifier is compatible with the call.
// OpenCL v2.0 s6.13.16 - The access qualifiers for pipe should only be
// read_only and write_only, and assumed to be read_only if no qualifier is
// specified.
switch (Call->getDirectCallee()->getBuiltinID()) {
case Builtin::BIread_pipe:
case Builtin::BIreserve_read_pipe:
case Builtin::BIcommit_read_pipe:
case Builtin::BIwork_group_reserve_read_pipe:
case Builtin::BIsub_group_reserve_read_pipe:
case Builtin::BIwork_group_commit_read_pipe:
case Builtin::BIsub_group_commit_read_pipe:
if (!(!AccessQual || AccessQual->isReadOnly())) {
S.Diag(Arg0->getBeginLoc(),
diag::err_opencl_builtin_pipe_invalid_access_modifier)
<< "read_only" << Arg0->getSourceRange();
return true;
}
break;
case Builtin::BIwrite_pipe:
case Builtin::BIreserve_write_pipe:
case Builtin::BIcommit_write_pipe:
case Builtin::BIwork_group_reserve_write_pipe:
case Builtin::BIsub_group_reserve_write_pipe:
case Builtin::BIwork_group_commit_write_pipe:
case Builtin::BIsub_group_commit_write_pipe:
if (!(AccessQual && AccessQual->isWriteOnly())) {
S.Diag(Arg0->getBeginLoc(),
diag::err_opencl_builtin_pipe_invalid_access_modifier)
<< "write_only" << Arg0->getSourceRange();
return true;
}
break;
default:
break;
}
return false;
}
/// Returns true if pipe element type is different from the pointer.
static bool checkOpenCLPipePacketType(Sema &S, CallExpr *Call, unsigned Idx) {
const Expr *Arg0 = Call->getArg(0);
const Expr *ArgIdx = Call->getArg(Idx);
const PipeType *PipeTy = cast<PipeType>(Arg0->getType());
const QualType EltTy = PipeTy->getElementType();
const PointerType *ArgTy = ArgIdx->getType()->getAs<PointerType>();
// The Idx argument should be a pointer and the type of the pointer and
// the type of pipe element should also be the same.
if (!ArgTy ||
!S.Context.hasSameType(
EltTy, ArgTy->getPointeeType()->getCanonicalTypeInternal())) {
S.Diag(Call->getBeginLoc(), diag::err_opencl_builtin_pipe_invalid_arg)
<< Call->getDirectCallee() << S.Context.getPointerType(EltTy)
<< ArgIdx->getType() << ArgIdx->getSourceRange();
return true;
}
return false;
}
// Performs semantic analysis for the read/write_pipe call.
// \param S Reference to the semantic analyzer.
// \param Call A pointer to the builtin call.
// \return True if a semantic error has been found, false otherwise.
static bool SemaBuiltinRWPipe(Sema &S, CallExpr *Call) {
// OpenCL v2.0 s6.13.16.2 - The built-in read/write
// functions have two forms.
switch (Call->getNumArgs()) {
case 2:
if (checkOpenCLPipeArg(S, Call))
return true;
// The call with 2 arguments should be
// read/write_pipe(pipe T, T*).
// Check packet type T.
if (checkOpenCLPipePacketType(S, Call, 1))
return true;
break;
case 4: {
if (checkOpenCLPipeArg(S, Call))
return true;
// The call with 4 arguments should be
// read/write_pipe(pipe T, reserve_id_t, uint, T*).
// Check reserve_id_t.
if (!Call->getArg(1)->getType()->isReserveIDT()) {
S.Diag(Call->getBeginLoc(), diag::err_opencl_builtin_pipe_invalid_arg)
<< Call->getDirectCallee() << S.Context.OCLReserveIDTy
<< Call->getArg(1)->getType() << Call->getArg(1)->getSourceRange();
return true;
}
// Check the index.
const Expr *Arg2 = Call->getArg(2);
if (!Arg2->getType()->isIntegerType() &&
!Arg2->getType()->isUnsignedIntegerType()) {
S.Diag(Call->getBeginLoc(), diag::err_opencl_builtin_pipe_invalid_arg)
<< Call->getDirectCallee() << S.Context.UnsignedIntTy
<< Arg2->getType() << Arg2->getSourceRange();
return true;
}
// Check packet type T.
if (checkOpenCLPipePacketType(S, Call, 3))
return true;
} break;
default:
S.Diag(Call->getBeginLoc(), diag::err_opencl_builtin_pipe_arg_num)
<< Call->getDirectCallee() << Call->getSourceRange();
return true;
}
return false;
}
// Performs a semantic analysis on the {work_group_/sub_group_
// /_}reserve_{read/write}_pipe
// \param S Reference to the semantic analyzer.
// \param Call The call to the builtin function to be analyzed.
// \return True if a semantic error was found, false otherwise.
static bool SemaBuiltinReserveRWPipe(Sema &S, CallExpr *Call) {
if (checkArgCount(S, Call, 2))
return true;
if (checkOpenCLPipeArg(S, Call))
return true;
// Check the reserve size.
if (!Call->getArg(1)->getType()->isIntegerType() &&
!Call->getArg(1)->getType()->isUnsignedIntegerType()) {
S.Diag(Call->getBeginLoc(), diag::err_opencl_builtin_pipe_invalid_arg)
<< Call->getDirectCallee() << S.Context.UnsignedIntTy
<< Call->getArg(1)->getType() << Call->getArg(1)->getSourceRange();
return true;
}
// Since return type of reserve_read/write_pipe built-in function is
// reserve_id_t, which is not defined in the builtin def file , we used int
// as return type and need to override the return type of these functions.
Call->setType(S.Context.OCLReserveIDTy);
return false;
}
// Performs a semantic analysis on {work_group_/sub_group_
// /_}commit_{read/write}_pipe
// \param S Reference to the semantic analyzer.
// \param Call The call to the builtin function to be analyzed.
// \return True if a semantic error was found, false otherwise.
static bool SemaBuiltinCommitRWPipe(Sema &S, CallExpr *Call) {
if (checkArgCount(S, Call, 2))
return true;
if (checkOpenCLPipeArg(S, Call))
return true;
// Check reserve_id_t.
if (!Call->getArg(1)->getType()->isReserveIDT()) {
S.Diag(Call->getBeginLoc(), diag::err_opencl_builtin_pipe_invalid_arg)
<< Call->getDirectCallee() << S.Context.OCLReserveIDTy
<< Call->getArg(1)->getType() << Call->getArg(1)->getSourceRange();
return true;
}
return false;
}
// Performs a semantic analysis on the call to built-in Pipe
// Query Functions.
// \param S Reference to the semantic analyzer.
// \param Call The call to the builtin function to be analyzed.
// \return True if a semantic error was found, false otherwise.
static bool SemaBuiltinPipePackets(Sema &S, CallExpr *Call) {
if (checkArgCount(S, Call, 1))
return true;
if (!Call->getArg(0)->getType()->isPipeType()) {
S.Diag(Call->getBeginLoc(), diag::err_opencl_builtin_pipe_first_arg)
<< Call->getDirectCallee() << Call->getArg(0)->getSourceRange();
return true;
}
return false;
}
// OpenCL v2.0 s6.13.9 - Address space qualifier functions.
// Performs semantic analysis for the to_global/local/private call.
// \param S Reference to the semantic analyzer.
// \param BuiltinID ID of the builtin function.
// \param Call A pointer to the builtin call.
// \return True if a semantic error has been found, false otherwise.
static bool SemaOpenCLBuiltinToAddr(Sema &S, unsigned BuiltinID,
CallExpr *Call) {
if (checkArgCount(S, Call, 1))
return true;
auto RT = Call->getArg(0)->getType();
if (!RT->isPointerType() || RT->getPointeeType()
.getAddressSpace() == LangAS::opencl_constant) {
S.Diag(Call->getBeginLoc(), diag::err_opencl_builtin_to_addr_invalid_arg)
<< Call->getArg(0) << Call->getDirectCallee() << Call->getSourceRange();
return true;
}
if (RT->getPointeeType().getAddressSpace() != LangAS::opencl_generic) {
S.Diag(Call->getArg(0)->getBeginLoc(),
diag::warn_opencl_generic_address_space_arg)
<< Call->getDirectCallee()->getNameInfo().getAsString()
<< Call->getArg(0)->getSourceRange();
}
RT = RT->getPointeeType();
auto Qual = RT.getQualifiers();
switch (BuiltinID) {
case Builtin::BIto_global:
Qual.setAddressSpace(LangAS::opencl_global);
break;
case Builtin::BIto_local:
Qual.setAddressSpace(LangAS::opencl_local);
break;
case Builtin::BIto_private:
Qual.setAddressSpace(LangAS::opencl_private);
break;
default:
llvm_unreachable("Invalid builtin function");
}
Call->setType(S.Context.getPointerType(S.Context.getQualifiedType(
RT.getUnqualifiedType(), Qual)));
return false;
}
static ExprResult SemaBuiltinLaunder(Sema &S, CallExpr *TheCall) {
if (checkArgCount(S, TheCall, 1))
return ExprError();
// Compute __builtin_launder's parameter type from the argument.
// The parameter type is:
// * The type of the argument if it's not an array or function type,
// Otherwise,
// * The decayed argument type.
QualType ParamTy = [&]() {
QualType ArgTy = TheCall->getArg(0)->getType();
if (const ArrayType *Ty = ArgTy->getAsArrayTypeUnsafe())
return S.Context.getPointerType(Ty->getElementType());
if (ArgTy->isFunctionType()) {
return S.Context.getPointerType(ArgTy);
}
return ArgTy;
}();
TheCall->setType(ParamTy);
auto DiagSelect = [&]() -> llvm::Optional<unsigned> {
if (!ParamTy->isPointerType())
return 0;
if (ParamTy->isFunctionPointerType())
return 1;
if (ParamTy->isVoidPointerType())
return 2;
return llvm::Optional<unsigned>{};
}();
if (DiagSelect.hasValue()) {
S.Diag(TheCall->getBeginLoc(), diag::err_builtin_launder_invalid_arg)
<< DiagSelect.getValue() << TheCall->getSourceRange();
return ExprError();
}
// We either have an incomplete class type, or we have a class template
// whose instantiation has not been forced. Example:
//
// template <class T> struct Foo { T value; };
// Foo<int> *p = nullptr;
// auto *d = __builtin_launder(p);
if (S.RequireCompleteType(TheCall->getBeginLoc(), ParamTy->getPointeeType(),
diag::err_incomplete_type))
return ExprError();
assert(ParamTy->getPointeeType()->isObjectType() &&
"Unhandled non-object pointer case");
InitializedEntity Entity =
InitializedEntity::InitializeParameter(S.Context, ParamTy, false);
ExprResult Arg =
S.PerformCopyInitialization(Entity, SourceLocation(), TheCall->getArg(0));
if (Arg.isInvalid())
return ExprError();
TheCall->setArg(0, Arg.get());
return TheCall;
}
// Emit an error and return true if the current architecture is not in the list
// of supported architectures.
static bool
CheckBuiltinTargetSupport(Sema &S, unsigned BuiltinID, CallExpr *TheCall,
ArrayRef<llvm::Triple::ArchType> SupportedArchs) {
llvm::Triple::ArchType CurArch =
S.getASTContext().getTargetInfo().getTriple().getArch();
if (llvm::is_contained(SupportedArchs, CurArch))
return false;
S.Diag(TheCall->getBeginLoc(), diag::err_builtin_target_unsupported)
<< TheCall->getSourceRange();
return true;
}
static void CheckNonNullArgument(Sema &S, const Expr *ArgExpr,
SourceLocation CallSiteLoc);
bool Sema::CheckTSBuiltinFunctionCall(const TargetInfo &TI, unsigned BuiltinID,
CallExpr *TheCall) {
switch (TI.getTriple().getArch()) {
default:
// Some builtins don't require additional checking, so just consider these
// acceptable.
return false;
case llvm::Triple::arm:
case llvm::Triple::armeb:
case llvm::Triple::thumb:
case llvm::Triple::thumbeb:
return CheckARMBuiltinFunctionCall(TI, BuiltinID, TheCall);
case llvm::Triple::aarch64:
case llvm::Triple::aarch64_32:
case llvm::Triple::aarch64_be:
return CheckAArch64BuiltinFunctionCall(TI, BuiltinID, TheCall);
case llvm::Triple::bpfeb:
case llvm::Triple::bpfel:
return CheckBPFBuiltinFunctionCall(BuiltinID, TheCall);
case llvm::Triple::hexagon:
return CheckHexagonBuiltinFunctionCall(BuiltinID, TheCall);
case llvm::Triple::mips:
case llvm::Triple::mipsel:
case llvm::Triple::mips64:
case llvm::Triple::mips64el:
return CheckMipsBuiltinFunctionCall(TI, BuiltinID, TheCall);
case llvm::Triple::systemz:
return CheckSystemZBuiltinFunctionCall(BuiltinID, TheCall);
case llvm::Triple::x86:
case llvm::Triple::x86_64:
return CheckX86BuiltinFunctionCall(TI, BuiltinID, TheCall);
case llvm::Triple::ppc:
case llvm::Triple::ppc64:
case llvm::Triple::ppc64le:
return CheckPPCBuiltinFunctionCall(TI, BuiltinID, TheCall);
case llvm::Triple::amdgcn:
return CheckAMDGCNBuiltinFunctionCall(BuiltinID, TheCall);
}
}
ExprResult
Sema::CheckBuiltinFunctionCall(FunctionDecl *FDecl, unsigned BuiltinID,
CallExpr *TheCall) {
ExprResult TheCallResult(TheCall);
// Find out if any arguments are required to be integer constant expressions.
unsigned ICEArguments = 0;
ASTContext::GetBuiltinTypeError Error;
Context.GetBuiltinType(BuiltinID, Error, &ICEArguments);
if (Error != ASTContext::GE_None)
ICEArguments = 0; // Don't diagnose previously diagnosed errors.
// If any arguments are required to be ICE's, check and diagnose.
for (unsigned ArgNo = 0; ICEArguments != 0; ++ArgNo) {
// Skip arguments not required to be ICE's.
if ((ICEArguments & (1 << ArgNo)) == 0) continue;
llvm::APSInt Result;
if (SemaBuiltinConstantArg(TheCall, ArgNo, Result))
return true;
ICEArguments &= ~(1 << ArgNo);
}
switch (BuiltinID) {
case Builtin::BI__builtin___CFStringMakeConstantString:
assert(TheCall->getNumArgs() == 1 &&
"Wrong # arguments to builtin CFStringMakeConstantString");
if (CheckObjCString(TheCall->getArg(0)))
return ExprError();
break;
case Builtin::BI__builtin_ms_va_start:
case Builtin::BI__builtin_stdarg_start:
case Builtin::BI__builtin_va_start:
if (SemaBuiltinVAStart(BuiltinID, TheCall))
return ExprError();
break;
case Builtin::BI__va_start: {
switch (Context.getTargetInfo().getTriple().getArch()) {
case llvm::Triple::aarch64:
case llvm::Triple::arm:
case llvm::Triple::thumb:
if (SemaBuiltinVAStartARMMicrosoft(TheCall))
return ExprError();
break;
default:
if (SemaBuiltinVAStart(BuiltinID, TheCall))
return ExprError();
break;
}
break;
}
// The acquire, release, and no fence variants are ARM and AArch64 only.
case Builtin::BI_interlockedbittestandset_acq:
case Builtin::BI_interlockedbittestandset_rel:
case Builtin::BI_interlockedbittestandset_nf:
case Builtin::BI_interlockedbittestandreset_acq:
case Builtin::BI_interlockedbittestandreset_rel:
case Builtin::BI_interlockedbittestandreset_nf:
if (CheckBuiltinTargetSupport(
*this, BuiltinID, TheCall,
{llvm::Triple::arm, llvm::Triple::thumb, llvm::Triple::aarch64}))
return ExprError();
break;
// The 64-bit bittest variants are x64, ARM, and AArch64 only.
case Builtin::BI_bittest64:
case Builtin::BI_bittestandcomplement64:
case Builtin::BI_bittestandreset64:
case Builtin::BI_bittestandset64:
case Builtin::BI_interlockedbittestandreset64:
case Builtin::BI_interlockedbittestandset64:
if (CheckBuiltinTargetSupport(*this, BuiltinID, TheCall,
{llvm::Triple::x86_64, llvm::Triple::arm,
llvm::Triple::thumb, llvm::Triple::aarch64}))
return ExprError();
break;
case Builtin::BI__builtin_isgreater:
case Builtin::BI__builtin_isgreaterequal:
case Builtin::BI__builtin_isless:
case Builtin::BI__builtin_islessequal:
case Builtin::BI__builtin_islessgreater:
case Builtin::BI__builtin_isunordered:
if (SemaBuiltinUnorderedCompare(TheCall))
return ExprError();
break;
case Builtin::BI__builtin_fpclassify:
if (SemaBuiltinFPClassification(TheCall, 6))
return ExprError();
break;
case Builtin::BI__builtin_isfinite:
case Builtin::BI__builtin_isinf:
case Builtin::BI__builtin_isinf_sign:
case Builtin::BI__builtin_isnan:
case Builtin::BI__builtin_isnormal:
case Builtin::BI__builtin_signbit:
case Builtin::BI__builtin_signbitf:
case Builtin::BI__builtin_signbitl:
if (SemaBuiltinFPClassification(TheCall, 1))
return ExprError();
break;
case Builtin::BI__builtin_shufflevector:
return SemaBuiltinShuffleVector(TheCall);
// TheCall will be freed by the smart pointer here, but that's fine, since
// SemaBuiltinShuffleVector guts it, but then doesn't release it.
case Builtin::BI__builtin_prefetch:
if (SemaBuiltinPrefetch(TheCall))
return ExprError();
break;
case Builtin::BI__builtin_alloca_with_align:
if (SemaBuiltinAllocaWithAlign(TheCall))
return ExprError();
LLVM_FALLTHROUGH;
case Builtin::BI__builtin_alloca:
Diag(TheCall->getBeginLoc(), diag::warn_alloca)
<< TheCall->getDirectCallee();
break;
case Builtin::BI__assume:
case Builtin::BI__builtin_assume:
if (SemaBuiltinAssume(TheCall))
return ExprError();
break;
case Builtin::BI__builtin_assume_aligned:
if (SemaBuiltinAssumeAligned(TheCall))
return ExprError();
break;
case Builtin::BI__builtin_dynamic_object_size:
case Builtin::BI__builtin_object_size:
if (SemaBuiltinConstantArgRange(TheCall, 1, 0, 3))
return ExprError();
break;
case Builtin::BI__builtin_longjmp:
if (SemaBuiltinLongjmp(TheCall))
return ExprError();
break;
case Builtin::BI__builtin_setjmp:
if (SemaBuiltinSetjmp(TheCall))
return ExprError();
break;
case Builtin::BI_setjmp:
case Builtin::BI_setjmpex:
if (checkArgCount(*this, TheCall, 1))
return true;
break;
case Builtin::BI__builtin_classify_type:
if (checkArgCount(*this, TheCall, 1)) return true;
TheCall->setType(Context.IntTy);
break;
case Builtin::BI__builtin_complex:
if (SemaBuiltinComplex(TheCall))
return ExprError();
break;
case Builtin::BI__builtin_constant_p: {
if (checkArgCount(*this, TheCall, 1)) return true;
ExprResult Arg = DefaultFunctionArrayLvalueConversion(TheCall->getArg(0));
if (Arg.isInvalid()) return true;
TheCall->setArg(0, Arg.get());
TheCall->setType(Context.IntTy);
break;
}
case Builtin::BI__builtin_launder:
return SemaBuiltinLaunder(*this, TheCall);
case Builtin::BI__sync_fetch_and_add:
case Builtin::BI__sync_fetch_and_add_1:
case Builtin::BI__sync_fetch_and_add_2:
case Builtin::BI__sync_fetch_and_add_4:
case Builtin::BI__sync_fetch_and_add_8:
case Builtin::BI__sync_fetch_and_add_16:
case Builtin::BI__sync_fetch_and_sub:
case Builtin::BI__sync_fetch_and_sub_1:
case Builtin::BI__sync_fetch_and_sub_2:
case Builtin::BI__sync_fetch_and_sub_4:
case Builtin::BI__sync_fetch_and_sub_8:
case Builtin::BI__sync_fetch_and_sub_16:
case Builtin::BI__sync_fetch_and_or:
case Builtin::BI__sync_fetch_and_or_1:
case Builtin::BI__sync_fetch_and_or_2:
case Builtin::BI__sync_fetch_and_or_4:
case Builtin::BI__sync_fetch_and_or_8:
case Builtin::BI__sync_fetch_and_or_16:
case Builtin::BI__sync_fetch_and_and:
case Builtin::BI__sync_fetch_and_and_1:
case Builtin::BI__sync_fetch_and_and_2:
case Builtin::BI__sync_fetch_and_and_4:
case Builtin::BI__sync_fetch_and_and_8:
case Builtin::BI__sync_fetch_and_and_16:
case Builtin::BI__sync_fetch_and_xor:
case Builtin::BI__sync_fetch_and_xor_1:
case Builtin::BI__sync_fetch_and_xor_2:
case Builtin::BI__sync_fetch_and_xor_4:
case Builtin::BI__sync_fetch_and_xor_8:
case Builtin::BI__sync_fetch_and_xor_16:
case Builtin::BI__sync_fetch_and_nand:
case Builtin::BI__sync_fetch_and_nand_1:
case Builtin::BI__sync_fetch_and_nand_2:
case Builtin::BI__sync_fetch_and_nand_4:
case Builtin::BI__sync_fetch_and_nand_8:
case Builtin::BI__sync_fetch_and_nand_16:
case Builtin::BI__sync_add_and_fetch:
case Builtin::BI__sync_add_and_fetch_1:
case Builtin::BI__sync_add_and_fetch_2:
case Builtin::BI__sync_add_and_fetch_4:
case Builtin::BI__sync_add_and_fetch_8:
case Builtin::BI__sync_add_and_fetch_16:
case Builtin::BI__sync_sub_and_fetch:
case Builtin::BI__sync_sub_and_fetch_1:
case Builtin::BI__sync_sub_and_fetch_2:
case Builtin::BI__sync_sub_and_fetch_4:
case Builtin::BI__sync_sub_and_fetch_8:
case Builtin::BI__sync_sub_and_fetch_16:
case Builtin::BI__sync_and_and_fetch:
case Builtin::BI__sync_and_and_fetch_1:
case Builtin::BI__sync_and_and_fetch_2:
case Builtin::BI__sync_and_and_fetch_4:
case Builtin::BI__sync_and_and_fetch_8:
case Builtin::BI__sync_and_and_fetch_16:
case Builtin::BI__sync_or_and_fetch:
case Builtin::BI__sync_or_and_fetch_1:
case Builtin::BI__sync_or_and_fetch_2:
case Builtin::BI__sync_or_and_fetch_4:
case Builtin::BI__sync_or_and_fetch_8:
case Builtin::BI__sync_or_and_fetch_16:
case Builtin::BI__sync_xor_and_fetch:
case Builtin::BI__sync_xor_and_fetch_1:
case Builtin::BI__sync_xor_and_fetch_2:
case Builtin::BI__sync_xor_and_fetch_4:
case Builtin::BI__sync_xor_and_fetch_8:
case Builtin::BI__sync_xor_and_fetch_16:
case Builtin::BI__sync_nand_and_fetch:
case Builtin::BI__sync_nand_and_fetch_1:
case Builtin::BI__sync_nand_and_fetch_2:
case Builtin::BI__sync_nand_and_fetch_4:
case Builtin::BI__sync_nand_and_fetch_8:
case Builtin::BI__sync_nand_and_fetch_16:
case Builtin::BI__sync_val_compare_and_swap:
case Builtin::BI__sync_val_compare_and_swap_1:
case Builtin::BI__sync_val_compare_and_swap_2:
case Builtin::BI__sync_val_compare_and_swap_4:
case Builtin::BI__sync_val_compare_and_swap_8:
case Builtin::BI__sync_val_compare_and_swap_16:
case Builtin::BI__sync_bool_compare_and_swap:
case Builtin::BI__sync_bool_compare_and_swap_1:
case Builtin::BI__sync_bool_compare_and_swap_2:
case Builtin::BI__sync_bool_compare_and_swap_4:
case Builtin::BI__sync_bool_compare_and_swap_8:
case Builtin::BI__sync_bool_compare_and_swap_16:
case Builtin::BI__sync_lock_test_and_set:
case Builtin::BI__sync_lock_test_and_set_1:
case Builtin::BI__sync_lock_test_and_set_2:
case Builtin::BI__sync_lock_test_and_set_4:
case Builtin::BI__sync_lock_test_and_set_8:
case Builtin::BI__sync_lock_test_and_set_16:
case Builtin::BI__sync_lock_release:
case Builtin::BI__sync_lock_release_1:
case Builtin::BI__sync_lock_release_2:
case Builtin::BI__sync_lock_release_4:
case Builtin::BI__sync_lock_release_8:
case Builtin::BI__sync_lock_release_16:
case Builtin::BI__sync_swap:
case Builtin::BI__sync_swap_1:
case Builtin::BI__sync_swap_2:
case Builtin::BI__sync_swap_4:
case Builtin::BI__sync_swap_8:
case Builtin::BI__sync_swap_16:
return SemaBuiltinAtomicOverloaded(TheCallResult);
case Builtin::BI__sync_synchronize:
Diag(TheCall->getBeginLoc(), diag::warn_atomic_implicit_seq_cst)
<< TheCall->getCallee()->getSourceRange();
break;
case Builtin::BI__builtin_nontemporal_load:
case Builtin::BI__builtin_nontemporal_store:
return SemaBuiltinNontemporalOverloaded(TheCallResult);
case Builtin::BI__builtin_memcpy_inline: {
clang::Expr *SizeOp = TheCall->getArg(2);
// We warn about copying to or from `nullptr` pointers when `size` is
// greater than 0. When `size` is value dependent we cannot evaluate its
// value so we bail out.
if (SizeOp->isValueDependent())
break;
if (!SizeOp->EvaluateKnownConstInt(Context).isNullValue()) {
CheckNonNullArgument(*this, TheCall->getArg(0), TheCall->getExprLoc());
CheckNonNullArgument(*this, TheCall->getArg(1), TheCall->getExprLoc());
}
break;
}
#define BUILTIN(ID, TYPE, ATTRS)
#define ATOMIC_BUILTIN(ID, TYPE, ATTRS) \
case Builtin::BI##ID: \
return SemaAtomicOpsOverloaded(TheCallResult, AtomicExpr::AO##ID);
#include "clang/Basic/Builtins.def"
case Builtin::BI__annotation:
if (SemaBuiltinMSVCAnnotation(*this, TheCall))
return ExprError();
break;
case Builtin::BI__builtin_annotation:
if (SemaBuiltinAnnotation(*this, TheCall))
return ExprError();
break;
case Builtin::BI__builtin_addressof:
if (SemaBuiltinAddressof(*this, TheCall))
return ExprError();
break;
case Builtin::BI__builtin_is_aligned:
case Builtin::BI__builtin_align_up:
case Builtin::BI__builtin_align_down:
if (SemaBuiltinAlignment(*this, TheCall, BuiltinID))
return ExprError();
break;
case Builtin::BI__builtin_add_overflow:
case Builtin::BI__builtin_sub_overflow:
case Builtin::BI__builtin_mul_overflow:
if (SemaBuiltinOverflow(*this, TheCall, BuiltinID))
return ExprError();
break;
case Builtin::BI__builtin_operator_new:
case Builtin::BI__builtin_operator_delete: {
bool IsDelete = BuiltinID == Builtin::BI__builtin_operator_delete;
ExprResult Res =
SemaBuiltinOperatorNewDeleteOverloaded(TheCallResult, IsDelete);
if (Res.isInvalid())
CorrectDelayedTyposInExpr(TheCallResult.get());
return Res;
}
case Builtin::BI__builtin_dump_struct: {
// We first want to ensure we are called with 2 arguments
if (checkArgCount(*this, TheCall, 2))
return ExprError();
// Ensure that the first argument is of type 'struct XX *'
const Expr *PtrArg = TheCall->getArg(0)->IgnoreParenImpCasts();
const QualType PtrArgType = PtrArg->getType();
if (!PtrArgType->isPointerType() ||
!PtrArgType->getPointeeType()->isRecordType()) {
Diag(PtrArg->getBeginLoc(), diag::err_typecheck_convert_incompatible)
<< PtrArgType << "structure pointer" << 1 << 0 << 3 << 1 << PtrArgType
<< "structure pointer";
return ExprError();
}
// Ensure that the second argument is of type 'FunctionType'
const Expr *FnPtrArg = TheCall->getArg(1)->IgnoreImpCasts();
const QualType FnPtrArgType = FnPtrArg->getType();
if (!FnPtrArgType->isPointerType()) {
Diag(FnPtrArg->getBeginLoc(), diag::err_typecheck_convert_incompatible)
<< FnPtrArgType << "'int (*)(const char *, ...)'" << 1 << 0 << 3 << 2
<< FnPtrArgType << "'int (*)(const char *, ...)'";
return ExprError();
}
const auto *FuncType =
FnPtrArgType->getPointeeType()->getAs<FunctionType>();
if (!FuncType) {
Diag(FnPtrArg->getBeginLoc(), diag::err_typecheck_convert_incompatible)
<< FnPtrArgType << "'int (*)(const char *, ...)'" << 1 << 0 << 3 << 2
<< FnPtrArgType << "'int (*)(const char *, ...)'";
return ExprError();
}
if (const auto *FT = dyn_cast<FunctionProtoType>(FuncType)) {
if (!FT->getNumParams()) {
Diag(FnPtrArg->getBeginLoc(), diag::err_typecheck_convert_incompatible)
<< FnPtrArgType << "'int (*)(const char *, ...)'" << 1 << 0 << 3
<< 2 << FnPtrArgType << "'int (*)(const char *, ...)'";
return ExprError();
}
QualType PT = FT->getParamType(0);
if (!FT->isVariadic() || FT->getReturnType() != Context.IntTy ||
!PT->isPointerType() || !PT->getPointeeType()->isCharType() ||
!PT->getPointeeType().isConstQualified()) {
Diag(FnPtrArg->getBeginLoc(), diag::err_typecheck_convert_incompatible)
<< FnPtrArgType << "'int (*)(const char *, ...)'" << 1 << 0 << 3
<< 2 << FnPtrArgType << "'int (*)(const char *, ...)'";
return ExprError();
}
}
TheCall->setType(Context.IntTy);
break;
}
case Builtin::BI__builtin_expect_with_probability: {
// We first want to ensure we are called with 3 arguments
if (checkArgCount(*this, TheCall, 3))
return ExprError();
// then check probability is constant float in range [0.0, 1.0]
const Expr *ProbArg = TheCall->getArg(2);
SmallVector<PartialDiagnosticAt, 8> Notes;
Expr::EvalResult Eval;
Eval.Diag = &Notes;
if ((!ProbArg->EvaluateAsConstantExpr(Eval, Expr::EvaluateForCodeGen,
Context)) ||
!Eval.Val.isFloat()) {
Diag(ProbArg->getBeginLoc(), diag::err_probability_not_constant_float)
<< ProbArg->getSourceRange();
for (const PartialDiagnosticAt &PDiag : Notes)
Diag(PDiag.first, PDiag.second);
return ExprError();
}
llvm::APFloat Probability = Eval.Val.getFloat();
bool LoseInfo = false;
Probability.convert(llvm::APFloat::IEEEdouble(),
llvm::RoundingMode::Dynamic, &LoseInfo);
if (!(Probability >= llvm::APFloat(0.0) &&
Probability <= llvm::APFloat(1.0))) {
Diag(ProbArg->getBeginLoc(), diag::err_probability_out_of_range)
<< ProbArg->getSourceRange();
return ExprError();
}
break;
}
case Builtin::BI__builtin_preserve_access_index:
if (SemaBuiltinPreserveAI(*this, TheCall))
return ExprError();
break;
case Builtin::BI__builtin_call_with_static_chain:
if (SemaBuiltinCallWithStaticChain(*this, TheCall))
return ExprError();
break;
case Builtin::BI__exception_code:
case Builtin::BI_exception_code:
if (SemaBuiltinSEHScopeCheck(*this, TheCall, Scope::SEHExceptScope,
diag::err_seh___except_block))
return ExprError();
break;
case Builtin::BI__exception_info:
case Builtin::BI_exception_info:
if (SemaBuiltinSEHScopeCheck(*this, TheCall, Scope::SEHFilterScope,
diag::err_seh___except_filter))
return ExprError();
break;
case Builtin::BI__GetExceptionInfo:
if (checkArgCount(*this, TheCall, 1))
return ExprError();
if (CheckCXXThrowOperand(
TheCall->getBeginLoc(),
Context.getExceptionObjectType(FDecl->getParamDecl(0)->getType()),
TheCall))
return ExprError();
TheCall->setType(Context.VoidPtrTy);
break;
// OpenCL v2.0, s6.13.16 - Pipe functions
case Builtin::BIread_pipe:
case Builtin::BIwrite_pipe:
// Since those two functions are declared with var args, we need a semantic
// check for the argument.
if (SemaBuiltinRWPipe(*this, TheCall))
return ExprError();
break;
case Builtin::BIreserve_read_pipe:
case Builtin::BIreserve_write_pipe:
case Builtin::BIwork_group_reserve_read_pipe:
case Builtin::BIwork_group_reserve_write_pipe:
if (SemaBuiltinReserveRWPipe(*this, TheCall))
return ExprError();
break;
case Builtin::BIsub_group_reserve_read_pipe:
case Builtin::BIsub_group_reserve_write_pipe:
if (checkOpenCLSubgroupExt(*this, TheCall) ||
SemaBuiltinReserveRWPipe(*this, TheCall))
return ExprError();
break;
case Builtin::BIcommit_read_pipe:
case Builtin::BIcommit_write_pipe:
case Builtin::BIwork_group_commit_read_pipe:
case Builtin::BIwork_group_commit_write_pipe:
if (SemaBuiltinCommitRWPipe(*this, TheCall))
return ExprError();
break;
case Builtin::BIsub_group_commit_read_pipe:
case Builtin::BIsub_group_commit_write_pipe:
if (checkOpenCLSubgroupExt(*this, TheCall) ||
SemaBuiltinCommitRWPipe(*this, TheCall))
return ExprError();
break;
case Builtin::BIget_pipe_num_packets:
case Builtin::BIget_pipe_max_packets:
if (SemaBuiltinPipePackets(*this, TheCall))
return ExprError();
break;
case Builtin::BIto_global:
case Builtin::BIto_local:
case Builtin::BIto_private:
if (SemaOpenCLBuiltinToAddr(*this, BuiltinID, TheCall))
return ExprError();
break;
// OpenCL v2.0, s6.13.17 - Enqueue kernel functions.
case Builtin::BIenqueue_kernel:
if (SemaOpenCLBuiltinEnqueueKernel(*this, TheCall))
return ExprError();
break;
case Builtin::BIget_kernel_work_group_size:
case Builtin::BIget_kernel_preferred_work_group_size_multiple:
if (SemaOpenCLBuiltinKernelWorkGroupSize(*this, TheCall))
return ExprError();
break;
case Builtin::BIget_kernel_max_sub_group_size_for_ndrange:
case Builtin::BIget_kernel_sub_group_count_for_ndrange:
if (SemaOpenCLBuiltinNDRangeAndBlock(*this, TheCall))
return ExprError();
break;
case Builtin::BI__builtin_os_log_format:
Cleanup.setExprNeedsCleanups(true);
LLVM_FALLTHROUGH;
case Builtin::BI__builtin_os_log_format_buffer_size:
if (SemaBuiltinOSLogFormat(TheCall))
return ExprError();
break;
case Builtin::BI__builtin_frame_address:
case Builtin::BI__builtin_return_address: {
if (SemaBuiltinConstantArgRange(TheCall, 0, 0, 0xFFFF))
return ExprError();
// -Wframe-address warning if non-zero passed to builtin
// return/frame address.
Expr::EvalResult Result;
if (TheCall->getArg(0)->EvaluateAsInt(Result, getASTContext()) &&
Result.Val.getInt() != 0)
Diag(TheCall->getBeginLoc(), diag::warn_frame_address)
<< ((BuiltinID == Builtin::BI__builtin_return_address)
? "__builtin_return_address"
: "__builtin_frame_address")
<< TheCall->getSourceRange();
break;
}
case Builtin::BI__builtin_matrix_transpose:
return SemaBuiltinMatrixTranspose(TheCall, TheCallResult);
case Builtin::BI__builtin_matrix_column_major_load:
return SemaBuiltinMatrixColumnMajorLoad(TheCall, TheCallResult);
case Builtin::BI__builtin_matrix_column_major_store:
return SemaBuiltinMatrixColumnMajorStore(TheCall, TheCallResult);
}
// Since the target specific builtins for each arch overlap, only check those
// of the arch we are compiling for.
if (Context.BuiltinInfo.isTSBuiltin(BuiltinID)) {
if (Context.BuiltinInfo.isAuxBuiltinID(BuiltinID)) {
assert(Context.getAuxTargetInfo() &&
"Aux Target Builtin, but not an aux target?");
if (CheckTSBuiltinFunctionCall(
*Context.getAuxTargetInfo(),
Context.BuiltinInfo.getAuxBuiltinID(BuiltinID), TheCall))
return ExprError();
} else {
if (CheckTSBuiltinFunctionCall(Context.getTargetInfo(), BuiltinID,
TheCall))
return ExprError();
}
}
return TheCallResult;
}
// Get the valid immediate range for the specified NEON type code.
static unsigned RFT(unsigned t, bool shift = false, bool ForceQuad = false) {
NeonTypeFlags Type(t);
int IsQuad = ForceQuad ? true : Type.isQuad();
switch (Type.getEltType()) {
case NeonTypeFlags::Int8:
case NeonTypeFlags::Poly8:
return shift ? 7 : (8 << IsQuad) - 1;
case NeonTypeFlags::Int16:
case NeonTypeFlags::Poly16:
return shift ? 15 : (4 << IsQuad) - 1;
case NeonTypeFlags::Int32:
return shift ? 31 : (2 << IsQuad) - 1;
case NeonTypeFlags::Int64:
case NeonTypeFlags::Poly64:
return shift ? 63 : (1 << IsQuad) - 1;
case NeonTypeFlags::Poly128:
return shift ? 127 : (1 << IsQuad) - 1;
case NeonTypeFlags::Float16:
assert(!shift && "cannot shift float types!");
return (4 << IsQuad) - 1;
case NeonTypeFlags::Float32:
assert(!shift && "cannot shift float types!");
return (2 << IsQuad) - 1;
case NeonTypeFlags::Float64:
assert(!shift && "cannot shift float types!");
return (1 << IsQuad) - 1;
case NeonTypeFlags::BFloat16:
assert(!shift && "cannot shift float types!");
return (4 << IsQuad) - 1;
}
llvm_unreachable("Invalid NeonTypeFlag!");
}
/// getNeonEltType - Return the QualType corresponding to the elements of
/// the vector type specified by the NeonTypeFlags. This is used to check
/// the pointer arguments for Neon load/store intrinsics.
static QualType getNeonEltType(NeonTypeFlags Flags, ASTContext &Context,
bool IsPolyUnsigned, bool IsInt64Long) {
switch (Flags.getEltType()) {
case NeonTypeFlags::Int8:
return Flags.isUnsigned() ? Context.UnsignedCharTy : Context.SignedCharTy;
case NeonTypeFlags::Int16:
return Flags.isUnsigned() ? Context.UnsignedShortTy : Context.ShortTy;
case NeonTypeFlags::Int32:
return Flags.isUnsigned() ? Context.UnsignedIntTy : Context.IntTy;
case NeonTypeFlags::Int64:
if (IsInt64Long)
return Flags.isUnsigned() ? Context.UnsignedLongTy : Context.LongTy;
else
return Flags.isUnsigned() ? Context.UnsignedLongLongTy
: Context.LongLongTy;
case NeonTypeFlags::Poly8:
return IsPolyUnsigned ? Context.UnsignedCharTy : Context.SignedCharTy;
case NeonTypeFlags::Poly16:
return IsPolyUnsigned ? Context.UnsignedShortTy : Context.ShortTy;
case NeonTypeFlags::Poly64:
if (IsInt64Long)
return Context.UnsignedLongTy;
else
return Context.UnsignedLongLongTy;
case NeonTypeFlags::Poly128:
break;
case NeonTypeFlags::Float16:
return Context.HalfTy;
case NeonTypeFlags::Float32:
return Context.FloatTy;
case NeonTypeFlags::Float64:
return Context.DoubleTy;
case NeonTypeFlags::BFloat16:
return Context.BFloat16Ty;
}
llvm_unreachable("Invalid NeonTypeFlag!");
}
bool Sema::CheckSVEBuiltinFunctionCall(unsigned BuiltinID, CallExpr *TheCall) {
// Range check SVE intrinsics that take immediate values.
SmallVector<std::tuple<int,int,int>, 3> ImmChecks;
switch (BuiltinID) {
default:
return false;
#define GET_SVE_IMMEDIATE_CHECK
#include "clang/Basic/arm_sve_sema_rangechecks.inc"
#undef GET_SVE_IMMEDIATE_CHECK
}
// Perform all the immediate checks for this builtin call.
bool HasError = false;
for (auto &I : ImmChecks) {
int ArgNum, CheckTy, ElementSizeInBits;
std::tie(ArgNum, CheckTy, ElementSizeInBits) = I;
typedef bool(*OptionSetCheckFnTy)(int64_t Value);
// Function that checks whether the operand (ArgNum) is an immediate
// that is one of the predefined values.
auto CheckImmediateInSet = [&](OptionSetCheckFnTy CheckImm,
int ErrDiag) -> bool {
// We can't check the value of a dependent argument.
Expr *Arg = TheCall->getArg(ArgNum);
if (Arg->isTypeDependent() || Arg->isValueDependent())
return false;
// Check constant-ness first.
llvm::APSInt Imm;
if (SemaBuiltinConstantArg(TheCall, ArgNum, Imm))
return true;
if (!CheckImm(Imm.getSExtValue()))
return Diag(TheCall->getBeginLoc(), ErrDiag) << Arg->getSourceRange();
return false;
};
switch ((SVETypeFlags::ImmCheckType)CheckTy) {
case SVETypeFlags::ImmCheck0_31:
if (SemaBuiltinConstantArgRange(TheCall, ArgNum, 0, 31))
HasError = true;
break;
case SVETypeFlags::ImmCheck0_13:
if (SemaBuiltinConstantArgRange(TheCall, ArgNum, 0, 13))
HasError = true;
break;
case SVETypeFlags::ImmCheck1_16:
if (SemaBuiltinConstantArgRange(TheCall, ArgNum, 1, 16))
HasError = true;
break;
case SVETypeFlags::ImmCheck0_7:
if (SemaBuiltinConstantArgRange(TheCall, ArgNum, 0, 7))
HasError = true;
break;
case SVETypeFlags::ImmCheckExtract:
if (SemaBuiltinConstantArgRange(TheCall, ArgNum, 0,
(2048 / ElementSizeInBits) - 1))
HasError = true;
break;
case SVETypeFlags::ImmCheckShiftRight:
if (SemaBuiltinConstantArgRange(TheCall, ArgNum, 1, ElementSizeInBits))
HasError = true;
break;
case SVETypeFlags::ImmCheckShiftRightNarrow:
if (SemaBuiltinConstantArgRange(TheCall, ArgNum, 1,
ElementSizeInBits / 2))
HasError = true;
break;
case SVETypeFlags::ImmCheckShiftLeft:
if (SemaBuiltinConstantArgRange(TheCall, ArgNum, 0,
ElementSizeInBits - 1))
HasError = true;
break;
case SVETypeFlags::ImmCheckLaneIndex:
if (SemaBuiltinConstantArgRange(TheCall, ArgNum, 0,
(128 / (1 * ElementSizeInBits)) - 1))
HasError = true;
break;
case SVETypeFlags::ImmCheckLaneIndexCompRotate:
if (SemaBuiltinConstantArgRange(TheCall, ArgNum, 0,
(128 / (2 * ElementSizeInBits)) - 1))
HasError = true;
break;
case SVETypeFlags::ImmCheckLaneIndexDot:
if (SemaBuiltinConstantArgRange(TheCall, ArgNum, 0,
(128 / (4 * ElementSizeInBits)) - 1))
HasError = true;
break;
case SVETypeFlags::ImmCheckComplexRot90_270:
if (CheckImmediateInSet([](int64_t V) { return V == 90 || V == 270; },
diag::err_rotation_argument_to_cadd))
HasError = true;
break;
case SVETypeFlags::ImmCheckComplexRotAll90:
if (CheckImmediateInSet(
[](int64_t V) {
return V == 0 || V == 90 || V == 180 || V == 270;
},
diag::err_rotation_argument_to_cmla))
HasError = true;
break;
case SVETypeFlags::ImmCheck0_1:
if (SemaBuiltinConstantArgRange(TheCall, ArgNum, 0, 1))
HasError = true;
break;
case SVETypeFlags::ImmCheck0_2:
if (SemaBuiltinConstantArgRange(TheCall, ArgNum, 0, 2))
HasError = true;
break;
case SVETypeFlags::ImmCheck0_3:
if (SemaBuiltinConstantArgRange(TheCall, ArgNum, 0, 3))
HasError = true;
break;
}
}
return HasError;
}
bool Sema::CheckNeonBuiltinFunctionCall(const TargetInfo &TI,
unsigned BuiltinID, CallExpr *TheCall) {
llvm::APSInt Result;
uint64_t mask = 0;
unsigned TV = 0;
int PtrArgNum = -1;
bool HasConstPtr = false;
switch (BuiltinID) {
#define GET_NEON_OVERLOAD_CHECK
#include "clang/Basic/arm_neon.inc"
#include "clang/Basic/arm_fp16.inc"
#undef GET_NEON_OVERLOAD_CHECK
}
// For NEON intrinsics which are overloaded on vector element type, validate
// the immediate which specifies which variant to emit.
unsigned ImmArg = TheCall->getNumArgs()-1;
if (mask) {
if (SemaBuiltinConstantArg(TheCall, ImmArg, Result))
return true;
TV = Result.getLimitedValue(64);
if ((TV > 63) || (mask & (1ULL << TV)) == 0)
return Diag(TheCall->getBeginLoc(), diag::err_invalid_neon_type_code)
<< TheCall->getArg(ImmArg)->getSourceRange();
}
if (PtrArgNum >= 0) {
// Check that pointer arguments have the specified type.
Expr *Arg = TheCall->getArg(PtrArgNum);
if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(Arg))
Arg = ICE->getSubExpr();
ExprResult RHS = DefaultFunctionArrayLvalueConversion(Arg);
QualType RHSTy = RHS.get()->getType();
llvm::Triple::ArchType Arch = TI.getTriple().getArch();
bool IsPolyUnsigned = Arch == llvm::Triple::aarch64 ||
Arch == llvm::Triple::aarch64_32 ||
Arch == llvm::Triple::aarch64_be;
bool IsInt64Long = TI.getInt64Type() == TargetInfo::SignedLong;
QualType EltTy =
getNeonEltType(NeonTypeFlags(TV), Context, IsPolyUnsigned, IsInt64Long);
if (HasConstPtr)
EltTy = EltTy.withConst();
QualType LHSTy = Context.getPointerType(EltTy);
AssignConvertType ConvTy;
ConvTy = CheckSingleAssignmentConstraints(LHSTy, RHS);
if (RHS.isInvalid())
return true;
if (DiagnoseAssignmentResult(ConvTy, Arg->getBeginLoc(), LHSTy, RHSTy,
RHS.get(), AA_Assigning))
return true;
}
// For NEON intrinsics which take an immediate value as part of the
// instruction, range check them here.
unsigned i = 0, l = 0, u = 0;
switch (BuiltinID) {
default:
return false;
#define GET_NEON_IMMEDIATE_CHECK
#include "clang/Basic/arm_neon.inc"
#include "clang/Basic/arm_fp16.inc"
#undef GET_NEON_IMMEDIATE_CHECK
}
return SemaBuiltinConstantArgRange(TheCall, i, l, u + l);
}
bool Sema::CheckMVEBuiltinFunctionCall(unsigned BuiltinID, CallExpr *TheCall) {
switch (BuiltinID) {
default:
return false;
#include "clang/Basic/arm_mve_builtin_sema.inc"
}
}
bool Sema::CheckCDEBuiltinFunctionCall(const TargetInfo &TI, unsigned BuiltinID,
CallExpr *TheCall) {
bool Err = false;
switch (BuiltinID) {
default:
return false;
#include "clang/Basic/arm_cde_builtin_sema.inc"
}
if (Err)
return true;
return CheckARMCoprocessorImmediate(TI, TheCall->getArg(0), /*WantCDE*/ true);
}
bool Sema::CheckARMCoprocessorImmediate(const TargetInfo &TI,
const Expr *CoprocArg, bool WantCDE) {
if (isConstantEvaluated())
return false;
// We can't check the value of a dependent argument.
if (CoprocArg->isTypeDependent() || CoprocArg->isValueDependent())
return false;
llvm::APSInt CoprocNoAP = *CoprocArg->getIntegerConstantExpr(Context);
int64_t CoprocNo = CoprocNoAP.getExtValue();
assert(CoprocNo >= 0 && "Coprocessor immediate must be non-negative");
uint32_t CDECoprocMask = TI.getARMCDECoprocMask();
bool IsCDECoproc = CoprocNo <= 7 && (CDECoprocMask & (1 << CoprocNo));
if (IsCDECoproc != WantCDE)
return Diag(CoprocArg->getBeginLoc(), diag::err_arm_invalid_coproc)
<< (int)CoprocNo << (int)WantCDE << CoprocArg->getSourceRange();
return false;
}
bool Sema::CheckARMBuiltinExclusiveCall(unsigned BuiltinID, CallExpr *TheCall,
unsigned MaxWidth) {
assert((BuiltinID == ARM::BI__builtin_arm_ldrex ||
BuiltinID == ARM::BI__builtin_arm_ldaex ||
BuiltinID == ARM::BI__builtin_arm_strex ||
BuiltinID == ARM::BI__builtin_arm_stlex ||
BuiltinID == AArch64::BI__builtin_arm_ldrex ||
BuiltinID == AArch64::BI__builtin_arm_ldaex ||
BuiltinID == AArch64::BI__builtin_arm_strex ||
BuiltinID == AArch64::BI__builtin_arm_stlex) &&
"unexpected ARM builtin");
bool IsLdrex = BuiltinID == ARM::BI__builtin_arm_ldrex ||
BuiltinID == ARM::BI__builtin_arm_ldaex ||
BuiltinID == AArch64::BI__builtin_arm_ldrex ||
BuiltinID == AArch64::BI__builtin_arm_ldaex;
DeclRefExpr *DRE =cast<DeclRefExpr>(TheCall->getCallee()->IgnoreParenCasts());
// Ensure that we have the proper number of arguments.
if (checkArgCount(*this, TheCall, IsLdrex ? 1 : 2))
return true;
// Inspect the pointer argument of the atomic builtin. This should always be
// a pointer type, whose element is an integral scalar or pointer type.
// Because it is a pointer type, we don't have to worry about any implicit
// casts here.
Expr *PointerArg = TheCall->getArg(IsLdrex ? 0 : 1);
ExprResult PointerArgRes = DefaultFunctionArrayLvalueConversion(PointerArg);
if (PointerArgRes.isInvalid())
return true;
PointerArg = PointerArgRes.get();
const PointerType *pointerType = PointerArg->getType()->getAs<PointerType>();
if (!pointerType) {
Diag(DRE->getBeginLoc(), diag::err_atomic_builtin_must_be_pointer)
<< PointerArg->getType() << PointerArg->getSourceRange();
return true;
}
// ldrex takes a "const volatile T*" and strex takes a "volatile T*". Our next
// task is to insert the appropriate casts into the AST. First work out just
// what the appropriate type is.
QualType ValType = pointerType->getPointeeType();
QualType AddrType = ValType.getUnqualifiedType().withVolatile();
if (IsLdrex)
AddrType.addConst();
// Issue a warning if the cast is dodgy.
CastKind CastNeeded = CK_NoOp;
if (!AddrType.isAtLeastAsQualifiedAs(ValType)) {
CastNeeded = CK_BitCast;
Diag(DRE->getBeginLoc(), diag::ext_typecheck_convert_discards_qualifiers)
<< PointerArg->getType() << Context.getPointerType(AddrType)
<< AA_Passing << PointerArg->getSourceRange();
}
// Finally, do the cast and replace the argument with the corrected version.
AddrType = Context.getPointerType(AddrType);
PointerArgRes = ImpCastExprToType(PointerArg, AddrType, CastNeeded);
if (PointerArgRes.isInvalid())
return true;
PointerArg = PointerArgRes.get();
TheCall->setArg(IsLdrex ? 0 : 1, PointerArg);
// In general, we allow ints, floats and pointers to be loaded and stored.
if (!ValType->isIntegerType() && !ValType->isAnyPointerType() &&
!ValType->isBlockPointerType() && !ValType->isFloatingType()) {
Diag(DRE->getBeginLoc(), diag::err_atomic_builtin_must_be_pointer_intfltptr)
<< PointerArg->getType() << PointerArg->getSourceRange();
return true;
}
// But ARM doesn't have instructions to deal with 128-bit versions.
if (Context.getTypeSize(ValType) > MaxWidth) {
assert(MaxWidth == 64 && "Diagnostic unexpectedly inaccurate");
Diag(DRE->getBeginLoc(), diag::err_atomic_exclusive_builtin_pointer_size)
<< PointerArg->getType() << PointerArg->getSourceRange();
return true;
}
switch (ValType.getObjCLifetime()) {
case Qualifiers::OCL_None:
case Qualifiers::OCL_ExplicitNone:
// okay
break;
case Qualifiers::OCL_Weak:
case Qualifiers::OCL_Strong:
case Qualifiers::OCL_Autoreleasing:
Diag(DRE->getBeginLoc(), diag::err_arc_atomic_ownership)
<< ValType << PointerArg->getSourceRange();
return true;
}
if (IsLdrex) {
TheCall->setType(ValType);
return false;
}
// Initialize the argument to be stored.
ExprResult ValArg = TheCall->getArg(0);
InitializedEntity Entity = InitializedEntity::InitializeParameter(
Context, ValType, /*consume*/ false);
ValArg = PerformCopyInitialization(Entity, SourceLocation(), ValArg);
if (ValArg.isInvalid())
return true;
TheCall->setArg(0, ValArg.get());
// __builtin_arm_strex always returns an int. It's marked as such in the .def,
// but the custom checker bypasses all default analysis.
TheCall->setType(Context.IntTy);
return false;
}
bool Sema::CheckARMBuiltinFunctionCall(const TargetInfo &TI, unsigned BuiltinID,
CallExpr *TheCall) {
if (BuiltinID == ARM::BI__builtin_arm_ldrex ||
BuiltinID == ARM::BI__builtin_arm_ldaex ||
BuiltinID == ARM::BI__builtin_arm_strex ||
BuiltinID == ARM::BI__builtin_arm_stlex) {
return CheckARMBuiltinExclusiveCall(BuiltinID, TheCall, 64);
}
if (BuiltinID == ARM::BI__builtin_arm_prefetch) {
return SemaBuiltinConstantArgRange(TheCall, 1, 0, 1) ||
SemaBuiltinConstantArgRange(TheCall, 2, 0, 1);
}
if (BuiltinID == ARM::BI__builtin_arm_rsr64 ||
BuiltinID == ARM::BI__builtin_arm_wsr64)
return SemaBuiltinARMSpecialReg(BuiltinID, TheCall, 0, 3, false);
if (BuiltinID == ARM::BI__builtin_arm_rsr ||
BuiltinID == ARM::BI__builtin_arm_rsrp ||
BuiltinID == ARM::BI__builtin_arm_wsr ||
BuiltinID == ARM::BI__builtin_arm_wsrp)
return SemaBuiltinARMSpecialReg(BuiltinID, TheCall, 0, 5, true);
if (CheckNeonBuiltinFunctionCall(TI, BuiltinID, TheCall))
return true;
if (CheckMVEBuiltinFunctionCall(BuiltinID, TheCall))
return true;
if (CheckCDEBuiltinFunctionCall(TI, BuiltinID, TheCall))
return true;
// For intrinsics which take an immediate value as part of the instruction,
// range check them here.
// FIXME: VFP Intrinsics should error if VFP not present.
switch (BuiltinID) {
default: return false;
case ARM::BI__builtin_arm_ssat:
return SemaBuiltinConstantArgRange(TheCall, 1, 1, 32);
case ARM::BI__builtin_arm_usat:
return SemaBuiltinConstantArgRange(TheCall, 1, 0, 31);
case ARM::BI__builtin_arm_ssat16:
return SemaBuiltinConstantArgRange(TheCall, 1, 1, 16);
case ARM::BI__builtin_arm_usat16:
return SemaBuiltinConstantArgRange(TheCall, 1, 0, 15);
case ARM::BI__builtin_arm_vcvtr_f:
case ARM::BI__builtin_arm_vcvtr_d:
return SemaBuiltinConstantArgRange(TheCall, 1, 0, 1);
case ARM::BI__builtin_arm_dmb:
case ARM::BI__builtin_arm_dsb:
case ARM::BI__builtin_arm_isb:
case ARM::BI__builtin_arm_dbg:
return SemaBuiltinConstantArgRange(TheCall, 0, 0, 15);
case ARM::BI__builtin_arm_cdp:
case ARM::BI__builtin_arm_cdp2:
case ARM::BI__builtin_arm_mcr:
case ARM::BI__builtin_arm_mcr2:
case ARM::BI__builtin_arm_mrc:
case ARM::BI__builtin_arm_mrc2:
case ARM::BI__builtin_arm_mcrr:
case ARM::BI__builtin_arm_mcrr2:
case ARM::BI__builtin_arm_mrrc:
case ARM::BI__builtin_arm_mrrc2:
case ARM::BI__builtin_arm_ldc:
case ARM::BI__builtin_arm_ldcl:
case ARM::BI__builtin_arm_ldc2:
case ARM::BI__builtin_arm_ldc2l:
case ARM::BI__builtin_arm_stc:
case ARM::BI__builtin_arm_stcl:
case ARM::BI__builtin_arm_stc2:
case ARM::BI__builtin_arm_stc2l:
return SemaBuiltinConstantArgRange(TheCall, 0, 0, 15) ||
CheckARMCoprocessorImmediate(TI, TheCall->getArg(0),
/*WantCDE*/ false);
}
}
bool Sema::CheckAArch64BuiltinFunctionCall(const TargetInfo &TI,
unsigned BuiltinID,
CallExpr *TheCall) {
if (BuiltinID == AArch64::BI__builtin_arm_ldrex ||
BuiltinID == AArch64::BI__builtin_arm_ldaex ||
BuiltinID == AArch64::BI__builtin_arm_strex ||
BuiltinID == AArch64::BI__builtin_arm_stlex) {
return CheckARMBuiltinExclusiveCall(BuiltinID, TheCall, 128);
}
if (BuiltinID == AArch64::BI__builtin_arm_prefetch) {
return SemaBuiltinConstantArgRange(TheCall, 1, 0, 1) ||
SemaBuiltinConstantArgRange(TheCall, 2, 0, 2) ||
SemaBuiltinConstantArgRange(TheCall, 3, 0, 1) ||
SemaBuiltinConstantArgRange(TheCall, 4, 0, 1);
}
if (BuiltinID == AArch64::BI__builtin_arm_rsr64 ||
BuiltinID == AArch64::BI__builtin_arm_wsr64)
return SemaBuiltinARMSpecialReg(BuiltinID, TheCall, 0, 5, true);
// Memory Tagging Extensions (MTE) Intrinsics
if (BuiltinID == AArch64::BI__builtin_arm_irg ||
BuiltinID == AArch64::BI__builtin_arm_addg ||
BuiltinID == AArch64::BI__builtin_arm_gmi ||
BuiltinID == AArch64::BI__builtin_arm_ldg ||
BuiltinID == AArch64::BI__builtin_arm_stg ||
BuiltinID == AArch64::BI__builtin_arm_subp) {
return SemaBuiltinARMMemoryTaggingCall(BuiltinID, TheCall);
}
if (BuiltinID == AArch64::BI__builtin_arm_rsr ||
BuiltinID == AArch64::BI__builtin_arm_rsrp ||
BuiltinID == AArch64::BI__builtin_arm_wsr ||
BuiltinID == AArch64::BI__builtin_arm_wsrp)
return SemaBuiltinARMSpecialReg(BuiltinID, TheCall, 0, 5, true);
// Only check the valid encoding range. Any constant in this range would be
// converted to a register of the form S1_2_C3_C4_5. Let the hardware throw
// an exception for incorrect registers. This matches MSVC behavior.
if (BuiltinID == AArch64::BI_ReadStatusReg ||
BuiltinID == AArch64::BI_WriteStatusReg)
return SemaBuiltinConstantArgRange(TheCall, 0, 0, 0x7fff);
if (BuiltinID == AArch64::BI__getReg)
return SemaBuiltinConstantArgRange(TheCall, 0, 0, 31);
if (CheckNeonBuiltinFunctionCall(TI, BuiltinID, TheCall))
return true;
if (CheckSVEBuiltinFunctionCall(BuiltinID, TheCall))
return true;
// For intrinsics which take an immediate value as part of the instruction,
// range check them here.
unsigned i = 0, l = 0, u = 0;
switch (BuiltinID) {
default: return false;
case AArch64::BI__builtin_arm_dmb:
case AArch64::BI__builtin_arm_dsb:
case AArch64::BI__builtin_arm_isb: l = 0; u = 15; break;
case AArch64::BI__builtin_arm_tcancel: l = 0; u = 65535; break;
}
return SemaBuiltinConstantArgRange(TheCall, i, l, u + l);
}
static bool isValidBPFPreserveFieldInfoArg(Expr *Arg) {
if (Arg->getType()->getAsPlaceholderType())
return false;
// The first argument needs to be a record field access.
// If it is an array element access, we delay decision
// to BPF backend to check whether the access is a
// field access or not.
return (Arg->IgnoreParens()->getObjectKind() == OK_BitField ||
dyn_cast<MemberExpr>(Arg->IgnoreParens()) ||
dyn_cast<ArraySubscriptExpr>(Arg->IgnoreParens()));
}
static bool isValidBPFPreserveTypeInfoArg(Expr *Arg) {
QualType ArgType = Arg->getType();
if (ArgType->getAsPlaceholderType())
return false;
// for TYPE_EXISTENCE/TYPE_SIZEOF reloc type
// format:
// 1. __builtin_preserve_type_info(*(<type> *)0, flag);
// 2. <type> var;
// __builtin_preserve_type_info(var, flag);
if (!dyn_cast<DeclRefExpr>(Arg->IgnoreParens()) &&
!dyn_cast<UnaryOperator>(Arg->IgnoreParens()))
return false;
// Typedef type.
if (ArgType->getAs<TypedefType>())
return true;
// Record type or Enum type.
const Type *Ty = ArgType->getUnqualifiedDesugaredType();
if (const auto *RT = Ty->getAs<RecordType>()) {
if (!RT->getDecl()->getDeclName().isEmpty())
return true;
} else if (const auto *ET = Ty->getAs<EnumType>()) {
if (!ET->getDecl()->getDeclName().isEmpty())
return true;
}
return false;
}
static bool isValidBPFPreserveEnumValueArg(Expr *Arg) {
QualType ArgType = Arg->getType();
if (ArgType->getAsPlaceholderType())
return false;
// for ENUM_VALUE_EXISTENCE/ENUM_VALUE reloc type
// format:
// __builtin_preserve_enum_value(*(<enum_type> *)<enum_value>,
// flag);
const auto *UO = dyn_cast<UnaryOperator>(Arg->IgnoreParens());
if (!UO)
return false;
const auto *CE = dyn_cast<CStyleCastExpr>(UO->getSubExpr());
if (!CE || CE->getCastKind() != CK_IntegralToPointer)
return false;
// The integer must be from an EnumConstantDecl.
const auto *DR = dyn_cast<DeclRefExpr>(CE->getSubExpr());
if (!DR)
return false;
const EnumConstantDecl *Enumerator =
dyn_cast<EnumConstantDecl>(DR->getDecl());
if (!Enumerator)
return false;
// The type must be EnumType.
const Type *Ty = ArgType->getUnqualifiedDesugaredType();
const auto *ET = Ty->getAs<EnumType>();
if (!ET)
return false;
// The enum value must be supported.
for (auto *EDI : ET->getDecl()->enumerators()) {
if (EDI == Enumerator)
return true;
}
return false;
}
bool Sema::CheckBPFBuiltinFunctionCall(unsigned BuiltinID,
CallExpr *TheCall) {
assert((BuiltinID == BPF::BI__builtin_preserve_field_info ||
BuiltinID == BPF::BI__builtin_btf_type_id ||
BuiltinID == BPF::BI__builtin_preserve_type_info ||
BuiltinID == BPF::BI__builtin_preserve_enum_value) &&
"unexpected BPF builtin");
if (checkArgCount(*this, TheCall, 2))
return true;
// The second argument needs to be a constant int
Expr *Arg = TheCall->getArg(1);
Optional<llvm::APSInt> Value = Arg->getIntegerConstantExpr(Context);
diag::kind kind;
if (!Value) {
if (BuiltinID == BPF::BI__builtin_preserve_field_info)
kind = diag::err_preserve_field_info_not_const;
else if (BuiltinID == BPF::BI__builtin_btf_type_id)
kind = diag::err_btf_type_id_not_const;
else if (BuiltinID == BPF::BI__builtin_preserve_type_info)
kind = diag::err_preserve_type_info_not_const;
else
kind = diag::err_preserve_enum_value_not_const;
Diag(Arg->getBeginLoc(), kind) << 2 << Arg->getSourceRange();
return true;
}
// The first argument
Arg = TheCall->getArg(0);
bool InvalidArg = false;
bool ReturnUnsignedInt = true;
if (BuiltinID == BPF::BI__builtin_preserve_field_info) {
if (!isValidBPFPreserveFieldInfoArg(Arg)) {
InvalidArg = true;
kind = diag::err_preserve_field_info_not_field;
}
} else if (BuiltinID == BPF::BI__builtin_preserve_type_info) {
if (!isValidBPFPreserveTypeInfoArg(Arg)) {
InvalidArg = true;
kind = diag::err_preserve_type_info_invalid;
}
} else if (BuiltinID == BPF::BI__builtin_preserve_enum_value) {
if (!isValidBPFPreserveEnumValueArg(Arg)) {
InvalidArg = true;
kind = diag::err_preserve_enum_value_invalid;
}
ReturnUnsignedInt = false;
}
if (InvalidArg) {
Diag(Arg->getBeginLoc(), kind) << 1 << Arg->getSourceRange();
return true;
}
if (ReturnUnsignedInt)
TheCall->setType(Context.UnsignedIntTy);
else
TheCall->setType(Context.UnsignedLongTy);
return false;
}
bool Sema::CheckHexagonBuiltinArgument(unsigned BuiltinID, CallExpr *TheCall) {
struct ArgInfo {
uint8_t OpNum;
bool IsSigned;
uint8_t BitWidth;
uint8_t Align;
};
struct BuiltinInfo {
unsigned BuiltinID;
ArgInfo Infos[2];
};
static BuiltinInfo Infos[] = {
{ Hexagon::BI__builtin_circ_ldd, {{ 3, true, 4, 3 }} },
{ Hexagon::BI__builtin_circ_ldw, {{ 3, true, 4, 2 }} },
{ Hexagon::BI__builtin_circ_ldh, {{ 3, true, 4, 1 }} },
{ Hexagon::BI__builtin_circ_lduh, {{ 3, true, 4, 1 }} },
{ Hexagon::BI__builtin_circ_ldb, {{ 3, true, 4, 0 }} },
{ Hexagon::BI__builtin_circ_ldub, {{ 3, true, 4, 0 }} },
{ Hexagon::BI__builtin_circ_std, {{ 3, true, 4, 3 }} },
{ Hexagon::BI__builtin_circ_stw, {{ 3, true, 4, 2 }} },
{ Hexagon::BI__builtin_circ_sth, {{ 3, true, 4, 1 }} },
{ Hexagon::BI__builtin_circ_sthhi, {{ 3, true, 4, 1 }} },
{ Hexagon::BI__builtin_circ_stb, {{ 3, true, 4, 0 }} },
{ Hexagon::BI__builtin_HEXAGON_L2_loadrub_pci, {{ 1, true, 4, 0 }} },
{ Hexagon::BI__builtin_HEXAGON_L2_loadrb_pci, {{ 1, true, 4, 0 }} },
{ Hexagon::BI__builtin_HEXAGON_L2_loadruh_pci, {{ 1, true, 4, 1 }} },
{ Hexagon::BI__builtin_HEXAGON_L2_loadrh_pci, {{ 1, true, 4, 1 }} },
{ Hexagon::BI__builtin_HEXAGON_L2_loadri_pci, {{ 1, true, 4, 2 }} },
{ Hexagon::BI__builtin_HEXAGON_L2_loadrd_pci, {{ 1, true, 4, 3 }} },
{ Hexagon::BI__builtin_HEXAGON_S2_storerb_pci, {{ 1, true, 4, 0 }} },
{ Hexagon::BI__builtin_HEXAGON_S2_storerh_pci, {{ 1, true, 4, 1 }} },
{ Hexagon::BI__builtin_HEXAGON_S2_storerf_pci, {{ 1, true, 4, 1 }} },
{ Hexagon::BI__builtin_HEXAGON_S2_storeri_pci, {{ 1, true, 4, 2 }} },
{ Hexagon::BI__builtin_HEXAGON_S2_storerd_pci, {{ 1, true, 4, 3 }} },
{ Hexagon::BI__builtin_HEXAGON_A2_combineii, {{ 1, true, 8, 0 }} },
{ Hexagon::BI__builtin_HEXAGON_A2_tfrih, {{ 1, false, 16, 0 }} },
{ Hexagon::BI__builtin_HEXAGON_A2_tfril, {{ 1, false, 16, 0 }} },
{ Hexagon::BI__builtin_HEXAGON_A2_tfrpi, {{ 0, true, 8, 0 }} },
{ Hexagon::BI__builtin_HEXAGON_A4_bitspliti, {{ 1, false, 5, 0 }} },
{ Hexagon::BI__builtin_HEXAGON_A4_cmpbeqi, {{ 1, false, 8, 0 }} },
{ Hexagon::BI__builtin_HEXAGON_A4_cmpbgti, {{ 1, true, 8, 0 }} },
{ Hexagon::BI__builtin_HEXAGON_A4_cround_ri, {{ 1, false, 5, 0 }} },
{ Hexagon::BI__builtin_HEXAGON_A4_round_ri, {{ 1, false, 5, 0 }} },
{ Hexagon::BI__builtin_HEXAGON_A4_round_ri_sat, {{ 1, false, 5, 0 }} },
{ Hexagon::BI__builtin_HEXAGON_A4_vcmpbeqi, {{ 1, false, 8, 0 }} },
{ Hexagon::BI__builtin_HEXAGON_A4_vcmpbgti, {{ 1, true, 8, 0 }} },
{ Hexagon::BI__builtin_HEXAGON_A4_vcmpbgtui, {{ 1, false, 7, 0 }} },
{ Hexagon::BI__builtin_HEXAGON_A4_vcmpheqi, {{ 1, true, 8, 0 }} },
{ Hexagon::BI__builtin_HEXAGON_A4_vcmphgti, {{ 1, true, 8, 0 }} },
{ Hexagon::BI__builtin_HEXAGON_A4_vcmphgtui, {{ 1, false, 7, 0 }} },
{ Hexagon::BI__builtin_HEXAGON_A4_vcmpweqi, {{ 1, true, 8, 0 }} },
{ Hexagon::BI__builtin_HEXAGON_A4_vcmpwgti, {{ 1, true, 8, 0 }} },
{ Hexagon::BI__builtin_HEXAGON_A4_vcmpwgtui, {{ 1, false, 7, 0 }} },
{ Hexagon::BI__builtin_HEXAGON_C2_bitsclri, {{ 1, false, 6, 0 }} },
{ Hexagon::BI__builtin_HEXAGON_C2_muxii, {{ 2, true, 8, 0 }} },
{ Hexagon::BI__builtin_HEXAGON_C4_nbitsclri, {{ 1, false, 6, 0 }} },
{ Hexagon::BI__builtin_HEXAGON_F2_dfclass, {{ 1, false, 5, 0 }} },
{ Hexagon::BI__builtin_HEXAGON_F2_dfimm_n, {{ 0, false, 10, 0 }} },
{ Hexagon::BI__builtin_HEXAGON_F2_dfimm_p, {{ 0, false, 10, 0 }} },
{ Hexagon::BI__builtin_HEXAGON_F2_sfclass, {{ 1, false, 5, 0 }} },
{ Hexagon::BI__builtin_HEXAGON_F2_sfimm_n, {{ 0, false, 10, 0 }} },
{ Hexagon::BI__builtin_HEXAGON_F2_sfimm_p, {{ 0, false, 10, 0 }} },
{ Hexagon::BI__builtin_HEXAGON_M4_mpyri_addi, {{ 2, false, 6, 0 }} },
{ Hexagon::BI__builtin_HEXAGON_M4_mpyri_addr_u2, {{ 1, false, 6, 2 }} },
{ Hexagon::BI__builtin_HEXAGON_S2_addasl_rrri, {{ 2, false, 3, 0 }} },
{ Hexagon::BI__builtin_HEXAGON_S2_asl_i_p_acc, {{ 2, false, 6, 0 }} },
{ Hexagon::BI__builtin_HEXAGON_S2_asl_i_p_and, {{ 2, false, 6, 0 }} },
{ Hexagon::BI__builtin_HEXAGON_S2_asl_i_p, {{ 1, false, 6, 0 }} },
{ Hexagon::BI__builtin_HEXAGON_S2_asl_i_p_nac, {{ 2, false, 6, 0 }} },
{ Hexagon::BI__builtin_HEXAGON_S2_asl_i_p_or, {{ 2, false, 6, 0 }} },
{ Hexagon::BI__builtin_HEXAGON_S2_asl_i_p_xacc, {{ 2, false, 6, 0 }} },
{ Hexagon::BI__builtin_HEXAGON_S2_asl_i_r_acc, {{ 2, false, 5, 0 }} },
{ Hexagon::BI__builtin_HEXAGON_S2_asl_i_r_and, {{ 2, false, 5, 0 }} },
{ Hexagon::BI__builtin_HEXAGON_S2_asl_i_r, {{ 1, false, 5, 0 }} },
{ Hexagon::BI__builtin_HEXAGON_S2_asl_i_r_nac, {{ 2, false, 5, 0 }} },
{ Hexagon::BI__builtin_HEXAGON_S2_asl_i_r_or, {{ 2, false, 5, 0 }} },
{ Hexagon::BI__builtin_HEXAGON_S2_asl_i_r_sat, {{ 1, false, 5, 0 }} },
{ Hexagon::BI__builtin_HEXAGON_S2_asl_i_r_xacc, {{ 2, false, 5, 0 }} },
{ Hexagon::BI__builtin_HEXAGON_S2_asl_i_vh, {{ 1, false, 4, 0 }} },
{ Hexagon::BI__builtin_HEXAGON_S2_asl_i_vw, {{ 1, false, 5, 0 }} },
{ Hexagon::BI__builtin_HEXAGON_S2_asr_i_p_acc, {{ 2, false, 6, 0 }} },
{ Hexagon::BI__builtin_HEXAGON_S2_asr_i_p_and, {{ 2, false, 6, 0 }} },
{ Hexagon::BI__builtin_HEXAGON_S2_asr_i_p, {{ 1, false, 6, 0 }} },
{ Hexagon::BI__builtin_HEXAGON_S2_asr_i_p_nac, {{ 2, false, 6, 0 }} },
{ Hexagon::BI__builtin_HEXAGON_S2_asr_i_p_or, {{ 2, false, 6, 0 }} },
{ Hexagon::BI__builtin_HEXAGON_S2_asr_i_p_rnd_goodsyntax,
{{ 1, false, 6, 0 }} },
{ Hexagon::BI__builtin_HEXAGON_S2_asr_i_p_rnd, {{ 1, false, 6, 0 }} },
{ Hexagon::BI__builtin_HEXAGON_S2_asr_i_r_acc, {{ 2, false, 5, 0 }} },
{ Hexagon::BI__builtin_HEXAGON_S2_asr_i_r_and, {{ 2, false, 5, 0 }} },
{ Hexagon::BI__builtin_HEXAGON_S2_asr_i_r, {{ 1, false, 5, 0 }} },
{ Hexagon::BI__builtin_HEXAGON_S2_asr_i_r_nac, {{ 2, false, 5, 0 }} },
{ Hexagon::BI__builtin_HEXAGON_S2_asr_i_r_or, {{ 2, false, 5, 0 }} },
{ Hexagon::BI__builtin_HEXAGON_S2_asr_i_r_rnd_goodsyntax,
{{ 1, false, 5, 0 }} },
{ Hexagon::BI__builtin_HEXAGON_S2_asr_i_r_rnd, {{ 1, false, 5, 0 }} },
{ Hexagon::BI__builtin_HEXAGON_S2_asr_i_svw_trun, {{ 1, false, 5, 0 }} },
{ Hexagon::BI__builtin_HEXAGON_S2_asr_i_vh, {{ 1, false, 4, 0 }} },
{ Hexagon::BI__builtin_HEXAGON_S2_asr_i_vw, {{ 1, false, 5, 0 }} },
{ Hexagon::BI__builtin_HEXAGON_S2_clrbit_i, {{ 1, false, 5, 0 }} },
{ Hexagon::BI__builtin_HEXAGON_S2_extractu, {{ 1, false, 5, 0 },
{ 2, false, 5, 0 }} },
{ Hexagon::BI__builtin_HEXAGON_S2_extractup, {{ 1, false, 6, 0 },
{ 2, false, 6, 0 }} },
{ Hexagon::BI__builtin_HEXAGON_S2_insert, {{ 2, false, 5, 0 },
{ 3, false, 5, 0 }} },
{ Hexagon::BI__builtin_HEXAGON_S2_insertp, {{ 2, false, 6, 0 },
{ 3, false, 6, 0 }} },
{ Hexagon::BI__builtin_HEXAGON_S2_lsr_i_p_acc, {{ 2, false, 6, 0 }} },
{ Hexagon::BI__builtin_HEXAGON_S2_lsr_i_p_and, {{ 2, false, 6, 0 }} },
{ Hexagon::BI__builtin_HEXAGON_S2_lsr_i_p, {{ 1, false, 6, 0 }} },
{ Hexagon::BI__builtin_HEXAGON_S2_lsr_i_p_nac, {{ 2, false, 6, 0 }} },
{ Hexagon::BI__builtin_HEXAGON_S2_lsr_i_p_or, {{ 2, false, 6, 0 }} },
{ Hexagon::BI__builtin_HEXAGON_S2_lsr_i_p_xacc, {{ 2, false, 6, 0 }} },
{ Hexagon::BI__builtin_HEXAGON_S2_lsr_i_r_acc, {{ 2, false, 5, 0 }} },
{ Hexagon::BI__builtin_HEXAGON_S2_lsr_i_r_and, {{ 2, false, 5, 0 }} },
{ Hexagon::BI__builtin_HEXAGON_S2_lsr_i_r, {{ 1, false, 5, 0 }} },
{ Hexagon::BI__builtin_HEXAGON_S2_lsr_i_r_nac, {{ 2, false, 5, 0 }} },
{ Hexagon::BI__builtin_HEXAGON_S2_lsr_i_r_or, {{ 2, false, 5, 0 }} },
{ Hexagon::BI__builtin_HEXAGON_S2_lsr_i_r_xacc, {{ 2, false, 5, 0 }} },
{ Hexagon::BI__builtin_HEXAGON_S2_lsr_i_vh, {{ 1, false, 4, 0 }} },
{ Hexagon::BI__builtin_HEXAGON_S2_lsr_i_vw, {{ 1, false, 5, 0 }} },
{ Hexagon::BI__builtin_HEXAGON_S2_setbit_i, {{ 1, false, 5, 0 }} },
{ Hexagon::BI__builtin_HEXAGON_S2_tableidxb_goodsyntax,
{{ 2, false, 4, 0 },
{ 3, false, 5, 0 }} },
{ Hexagon::BI__builtin_HEXAGON_S2_tableidxd_goodsyntax,
{{ 2, false, 4, 0 },
{ 3, false, 5, 0 }} },
{ Hexagon::BI__builtin_HEXAGON_S2_tableidxh_goodsyntax,
{{ 2, false, 4, 0 },
{ 3, false, 5, 0 }} },
{ Hexagon::BI__builtin_HEXAGON_S2_tableidxw_goodsyntax,
{{ 2, false, 4, 0 },
{ 3, false, 5, 0 }} },
{ Hexagon::BI__builtin_HEXAGON_S2_togglebit_i, {{ 1, false, 5, 0 }} },
{ Hexagon::BI__builtin_HEXAGON_S2_tstbit_i, {{ 1, false, 5, 0 }} },
{ Hexagon::BI__builtin_HEXAGON_S2_valignib, {{ 2, false, 3, 0 }} },
{ Hexagon::BI__builtin_HEXAGON_S2_vspliceib, {{ 2, false, 3, 0 }} },
{ Hexagon::BI__builtin_HEXAGON_S4_addi_asl_ri, {{ 2, false, 5, 0 }} },
{ Hexagon::BI__builtin_HEXAGON_S4_addi_lsr_ri, {{ 2, false, 5, 0 }} },
{ Hexagon::BI__builtin_HEXAGON_S4_andi_asl_ri, {{ 2, false, 5, 0 }} },
{ Hexagon::BI__builtin_HEXAGON_S4_andi_lsr_ri, {{ 2, false, 5, 0 }} },
{ Hexagon::BI__builtin_HEXAGON_S4_clbaddi, {{ 1, true , 6, 0 }} },
{ Hexagon::BI__builtin_HEXAGON_S4_clbpaddi, {{ 1, true, 6, 0 }} },
{ Hexagon::BI__builtin_HEXAGON_S4_extract, {{ 1, false, 5, 0 },
{ 2, false, 5, 0 }} },
{ Hexagon::BI__builtin_HEXAGON_S4_extractp, {{ 1, false, 6, 0 },
{ 2, false, 6, 0 }} },
{ Hexagon::BI__builtin_HEXAGON_S4_lsli, {{ 0, true, 6, 0 }} },
{ Hexagon::BI__builtin_HEXAGON_S4_ntstbit_i, {{ 1, false, 5, 0 }} },
{ Hexagon::BI__builtin_HEXAGON_S4_ori_asl_ri, {{ 2, false, 5, 0 }} },
{ Hexagon::BI__builtin_HEXAGON_S4_ori_lsr_ri, {{ 2, false, 5, 0 }} },
{ Hexagon::BI__builtin_HEXAGON_S4_subi_asl_ri, {{ 2, false, 5, 0 }} },
{ Hexagon::BI__builtin_HEXAGON_S4_subi_lsr_ri, {{ 2, false, 5, 0 }} },
{ Hexagon::BI__builtin_HEXAGON_S4_vrcrotate_acc, {{ 3, false, 2, 0 }} },
{ Hexagon::BI__builtin_HEXAGON_S4_vrcrotate, {{ 2, false, 2, 0 }} },
{ Hexagon::BI__builtin_HEXAGON_S5_asrhub_rnd_sat_goodsyntax,
{{ 1, false, 4, 0 }} },
{ Hexagon::BI__builtin_HEXAGON_S5_asrhub_sat, {{ 1, false, 4, 0 }} },
{ Hexagon::BI__builtin_HEXAGON_S5_vasrhrnd_goodsyntax,
{{ 1, false, 4, 0 }} },
{ Hexagon::BI__builtin_HEXAGON_S6_rol_i_p, {{ 1, false, 6, 0 }} },
{ Hexagon::BI__builtin_HEXAGON_S6_rol_i_p_acc, {{ 2, false, 6, 0 }} },
{ Hexagon::BI__builtin_HEXAGON_S6_rol_i_p_and, {{ 2, false, 6, 0 }} },
{ Hexagon::BI__builtin_HEXAGON_S6_rol_i_p_nac, {{ 2, false, 6, 0 }} },
{ Hexagon::BI__builtin_HEXAGON_S6_rol_i_p_or, {{ 2, false, 6, 0 }} },
{ Hexagon::BI__builtin_HEXAGON_S6_rol_i_p_xacc, {{ 2, false, 6, 0 }} },
{ Hexagon::BI__builtin_HEXAGON_S6_rol_i_r, {{ 1, false, 5, 0 }} },
{ Hexagon::BI__builtin_HEXAGON_S6_rol_i_r_acc, {{ 2, false, 5, 0 }} },
{ Hexagon::BI__builtin_HEXAGON_S6_rol_i_r_and, {{ 2, false, 5, 0 }} },
{ Hexagon::BI__builtin_HEXAGON_S6_rol_i_r_nac, {{ 2, false, 5, 0 }} },
{ Hexagon::BI__builtin_HEXAGON_S6_rol_i_r_or, {{ 2, false, 5, 0 }} },
{ Hexagon::BI__builtin_HEXAGON_S6_rol_i_r_xacc, {{ 2, false, 5, 0 }} },
{ Hexagon::BI__builtin_HEXAGON_V6_valignbi, {{ 2, false, 3, 0 }} },
{ Hexagon::BI__builtin_HEXAGON_V6_valignbi_128B, {{ 2, false, 3, 0 }} },
{ Hexagon::BI__builtin_HEXAGON_V6_vlalignbi, {{ 2, false, 3, 0 }} },
{ Hexagon::BI__builtin_HEXAGON_V6_vlalignbi_128B, {{ 2, false, 3, 0 }} },
{ Hexagon::BI__builtin_HEXAGON_V6_vrmpybusi, {{ 2, false, 1, 0 }} },
{ Hexagon::BI__builtin_HEXAGON_V6_vrmpybusi_128B, {{ 2, false, 1, 0 }} },
{ Hexagon::BI__builtin_HEXAGON_V6_vrmpybusi_acc, {{ 3, false, 1, 0 }} },
{ Hexagon::BI__builtin_HEXAGON_V6_vrmpybusi_acc_128B,
{{ 3, false, 1, 0 }} },
{ Hexagon::BI__builtin_HEXAGON_V6_vrmpyubi, {{ 2, false, 1, 0 }} },
{ Hexagon::BI__builtin_HEXAGON_V6_vrmpyubi_128B, {{ 2, false, 1, 0 }} },
{ Hexagon::BI__builtin_HEXAGON_V6_vrmpyubi_acc, {{ 3, false, 1, 0 }} },
{ Hexagon::BI__builtin_HEXAGON_V6_vrmpyubi_acc_128B,
{{ 3, false, 1, 0 }} },
{ Hexagon::BI__builtin_HEXAGON_V6_vrsadubi, {{ 2, false, 1, 0 }} },
{ Hexagon::BI__builtin_HEXAGON_V6_vrsadubi_128B, {{ 2, false, 1, 0 }} },
{ Hexagon::BI__builtin_HEXAGON_V6_vrsadubi_acc, {{ 3, false, 1, 0 }} },
{ Hexagon::BI__builtin_HEXAGON_V6_vrsadubi_acc_128B,
{{ 3, false, 1, 0 }} },
};
// Use a dynamically initialized static to sort the table exactly once on
// first run.
static const bool SortOnce =
(llvm::sort(Infos,
[](const BuiltinInfo &LHS, const BuiltinInfo &RHS) {
return LHS.BuiltinID < RHS.BuiltinID;
}),
true);
(void)SortOnce;
const BuiltinInfo *F = llvm::partition_point(
Infos, [=](const BuiltinInfo &BI) { return BI.BuiltinID < BuiltinID; });
if (F == std::end(Infos) || F->BuiltinID != BuiltinID)
return false;
bool Error = false;
for (const ArgInfo &A : F->Infos) {
// Ignore empty ArgInfo elements.
if (A.BitWidth == 0)
continue;
int32_t Min = A.IsSigned ? -(1 << (A.BitWidth - 1)) : 0;
int32_t Max = (1 << (A.IsSigned ? A.BitWidth - 1 : A.BitWidth)) - 1;
if (!A.Align) {
Error |= SemaBuiltinConstantArgRange(TheCall, A.OpNum, Min, Max);
} else {
unsigned M = 1 << A.Align;
Min *= M;
Max *= M;
Error |= SemaBuiltinConstantArgRange(TheCall, A.OpNum, Min, Max) |
SemaBuiltinConstantArgMultiple(TheCall, A.OpNum, M);
}
}
return Error;
}
bool Sema::CheckHexagonBuiltinFunctionCall(unsigned BuiltinID,
CallExpr *TheCall) {
return CheckHexagonBuiltinArgument(BuiltinID, TheCall);
}
bool Sema::CheckMipsBuiltinFunctionCall(const TargetInfo &TI,
unsigned BuiltinID, CallExpr *TheCall) {
return CheckMipsBuiltinCpu(TI, BuiltinID, TheCall) ||
CheckMipsBuiltinArgument(BuiltinID, TheCall);
}
bool Sema::CheckMipsBuiltinCpu(const TargetInfo &TI, unsigned BuiltinID,
CallExpr *TheCall) {
if (Mips::BI__builtin_mips_addu_qb <= BuiltinID &&
BuiltinID <= Mips::BI__builtin_mips_lwx) {
if (!TI.hasFeature("dsp"))
return Diag(TheCall->getBeginLoc(), diag::err_mips_builtin_requires_dsp);
}
if (Mips::BI__builtin_mips_absq_s_qb <= BuiltinID &&
BuiltinID <= Mips::BI__builtin_mips_subuh_r_qb) {
if (!TI.hasFeature("dspr2"))
return Diag(TheCall->getBeginLoc(),
diag::err_mips_builtin_requires_dspr2);
}
if (Mips::BI__builtin_msa_add_a_b <= BuiltinID &&
BuiltinID <= Mips::BI__builtin_msa_xori_b) {
if (!TI.hasFeature("msa"))
return Diag(TheCall->getBeginLoc(), diag::err_mips_builtin_requires_msa);
}
return false;
}
// CheckMipsBuiltinArgument - Checks the constant value passed to the
// intrinsic is correct. The switch statement is ordered by DSP, MSA. The
// ordering for DSP is unspecified. MSA is ordered by the data format used
// by the underlying instruction i.e., df/m, df/n and then by size.
//
// FIXME: The size tests here should instead be tablegen'd along with the
// definitions from include/clang/Basic/BuiltinsMips.def.
// FIXME: GCC is strict on signedness for some of these intrinsics, we should
// be too.
bool Sema::CheckMipsBuiltinArgument(unsigned BuiltinID, CallExpr *TheCall) {
unsigned i = 0, l = 0, u = 0, m = 0;
switch (BuiltinID) {
default: return false;
case Mips::BI__builtin_mips_wrdsp: i = 1; l = 0; u = 63; break;
case Mips::BI__builtin_mips_rddsp: i = 0; l = 0; u = 63; break;
case Mips::BI__builtin_mips_append: i = 2; l = 0; u = 31; break;
case Mips::BI__builtin_mips_balign: i = 2; l = 0; u = 3; break;
case Mips::BI__builtin_mips_precr_sra_ph_w: i = 2; l = 0; u = 31; break;
case Mips::BI__builtin_mips_precr_sra_r_ph_w: i = 2; l = 0; u = 31; break;
case Mips::BI__builtin_mips_prepend: i = 2; l = 0; u = 31; break;
// MSA intrinsics. Instructions (which the intrinsics maps to) which use the
// df/m field.
// These intrinsics take an unsigned 3 bit immediate.
case Mips::BI__builtin_msa_bclri_b:
case Mips::BI__builtin_msa_bnegi_b:
case Mips::BI__builtin_msa_bseti_b:
case Mips::BI__builtin_msa_sat_s_b:
case Mips::BI__builtin_msa_sat_u_b:
case Mips::BI__builtin_msa_slli_b:
case Mips::BI__builtin_msa_srai_b:
case Mips::BI__builtin_msa_srari_b:
case Mips::BI__builtin_msa_srli_b:
case Mips::BI__builtin_msa_srlri_b: i = 1; l = 0; u = 7; break;
case Mips::BI__builtin_msa_binsli_b:
case Mips::BI__builtin_msa_binsri_b: i = 2; l = 0; u = 7; break;
// These intrinsics take an unsigned 4 bit immediate.
case Mips::BI__builtin_msa_bclri_h:
case Mips::BI__builtin_msa_bnegi_h:
case Mips::BI__builtin_msa_bseti_h:
case Mips::BI__builtin_msa_sat_s_h:
case Mips::BI__builtin_msa_sat_u_h:
case Mips::BI__builtin_msa_slli_h:
case Mips::BI__builtin_msa_srai_h:
case Mips::BI__builtin_msa_srari_h:
case Mips::BI__builtin_msa_srli_h:
case Mips::BI__builtin_msa_srlri_h: i = 1; l = 0; u = 15; break;
case Mips::BI__builtin_msa_binsli_h:
case Mips::BI__builtin_msa_binsri_h: i = 2; l = 0; u = 15; break;
// These intrinsics take an unsigned 5 bit immediate.
// The first block of intrinsics actually have an unsigned 5 bit field,
// not a df/n field.
case Mips::BI__builtin_msa_cfcmsa:
case Mips::BI__builtin_msa_ctcmsa: i = 0; l = 0; u = 31; break;
case Mips::BI__builtin_msa_clei_u_b:
case Mips::BI__builtin_msa_clei_u_h:
case Mips::BI__builtin_msa_clei_u_w:
case Mips::BI__builtin_msa_clei_u_d:
case Mips::BI__builtin_msa_clti_u_b:
case Mips::BI__builtin_msa_clti_u_h:
case Mips::BI__builtin_msa_clti_u_w:
case Mips::BI__builtin_msa_clti_u_d:
case Mips::BI__builtin_msa_maxi_u_b:
case Mips::BI__builtin_msa_maxi_u_h:
case Mips::BI__builtin_msa_maxi_u_w:
case Mips::BI__builtin_msa_maxi_u_d:
case Mips::BI__builtin_msa_mini_u_b:
case Mips::BI__builtin_msa_mini_u_h:
case Mips::BI__builtin_msa_mini_u_w:
case Mips::BI__builtin_msa_mini_u_d:
case Mips::BI__builtin_msa_addvi_b:
case Mips::BI__builtin_msa_addvi_h:
case Mips::BI__builtin_msa_addvi_w:
case Mips::BI__builtin_msa_addvi_d:
case Mips::BI__builtin_msa_bclri_w:
case Mips::BI__builtin_msa_bnegi_w:
case Mips::BI__builtin_msa_bseti_w:
case Mips::BI__builtin_msa_sat_s_w:
case Mips::BI__builtin_msa_sat_u_w:
case Mips::BI__builtin_msa_slli_w:
case Mips::BI__builtin_msa_srai_w:
case Mips::BI__builtin_msa_srari_w:
case Mips::BI__builtin_msa_srli_w:
case Mips::BI__builtin_msa_srlri_w:
case Mips::BI__builtin_msa_subvi_b:
case Mips::BI__builtin_msa_subvi_h:
case Mips::BI__builtin_msa_subvi_w:
case Mips::BI__builtin_msa_subvi_d: i = 1; l = 0; u = 31; break;
case Mips::BI__builtin_msa_binsli_w:
case Mips::BI__builtin_msa_binsri_w: i = 2; l = 0; u = 31; break;
// These intrinsics take an unsigned 6 bit immediate.
case Mips::BI__builtin_msa_bclri_d:
case Mips::BI__builtin_msa_bnegi_d:
case Mips::BI__builtin_msa_bseti_d:
case Mips::BI__builtin_msa_sat_s_d:
case Mips::BI__builtin_msa_sat_u_d:
case Mips::BI__builtin_msa_slli_d:
case Mips::BI__builtin_msa_srai_d:
case Mips::BI__builtin_msa_srari_d:
case Mips::BI__builtin_msa_srli_d:
case Mips::BI__builtin_msa_srlri_d: i = 1; l = 0; u = 63; break;
case Mips::BI__builtin_msa_binsli_d:
case Mips::BI__builtin_msa_binsri_d: i = 2; l = 0; u = 63; break;
// These intrinsics take a signed 5 bit immediate.
case Mips::BI__builtin_msa_ceqi_b:
case Mips::BI__builtin_msa_ceqi_h:
case Mips::BI__builtin_msa_ceqi_w:
case Mips::BI__builtin_msa_ceqi_d:
case Mips::BI__builtin_msa_clti_s_b:
case Mips::BI__builtin_msa_clti_s_h:
case Mips::BI__builtin_msa_clti_s_w:
case Mips::BI__builtin_msa_clti_s_d:
case Mips::BI__builtin_msa_clei_s_b:
case Mips::BI__builtin_msa_clei_s_h:
case Mips::BI__builtin_msa_clei_s_w:
case Mips::BI__builtin_msa_clei_s_d:
case Mips::BI__builtin_msa_maxi_s_b:
case Mips::BI__builtin_msa_maxi_s_h:
case Mips::BI__builtin_msa_maxi_s_w:
case Mips::BI__builtin_msa_maxi_s_d:
case Mips::BI__builtin_msa_mini_s_b:
case Mips::BI__builtin_msa_mini_s_h:
case Mips::BI__builtin_msa_mini_s_w:
case Mips::BI__builtin_msa_mini_s_d: i = 1; l = -16; u = 15; break;
// These intrinsics take an unsigned 8 bit immediate.
case Mips::BI__builtin_msa_andi_b:
case Mips::BI__builtin_msa_nori_b:
case Mips::BI__builtin_msa_ori_b:
case Mips::BI__builtin_msa_shf_b:
case Mips::BI__builtin_msa_shf_h:
case Mips::BI__builtin_msa_shf_w:
case Mips::BI__builtin_msa_xori_b: i = 1; l = 0; u = 255; break;
case Mips::BI__builtin_msa_bseli_b:
case Mips::BI__builtin_msa_bmnzi_b:
case Mips::BI__builtin_msa_bmzi_b: i = 2; l = 0; u = 255; break;
// df/n format
// These intrinsics take an unsigned 4 bit immediate.
case Mips::BI__builtin_msa_copy_s_b:
case Mips::BI__builtin_msa_copy_u_b:
case Mips::BI__builtin_msa_insve_b:
case Mips::BI__builtin_msa_splati_b: i = 1; l = 0; u = 15; break;
case Mips::BI__builtin_msa_sldi_b: i = 2; l = 0; u = 15; break;
// These intrinsics take an unsigned 3 bit immediate.
case Mips::BI__builtin_msa_copy_s_h:
case Mips::BI__builtin_msa_copy_u_h:
case Mips::BI__builtin_msa_insve_h:
case Mips::BI__builtin_msa_splati_h: i = 1; l = 0; u = 7; break;
case Mips::BI__builtin_msa_sldi_h: i = 2; l = 0; u = 7; break;
// These intrinsics take an unsigned 2 bit immediate.
case Mips::BI__builtin_msa_copy_s_w:
case Mips::BI__builtin_msa_copy_u_w:
case Mips::BI__builtin_msa_insve_w:
case Mips::BI__builtin_msa_splati_w: i = 1; l = 0; u = 3; break;
case Mips::BI__builtin_msa_sldi_w: i = 2; l = 0; u = 3; break;
// These intrinsics take an unsigned 1 bit immediate.
case Mips::BI__builtin_msa_copy_s_d:
case Mips::BI__builtin_msa_copy_u_d:
case Mips::BI__builtin_msa_insve_d:
case Mips::BI__builtin_msa_splati_d: i = 1; l = 0; u = 1; break;
case Mips::BI__builtin_msa_sldi_d: i = 2; l = 0; u = 1; break;
// Memory offsets and immediate loads.
// These intrinsics take a signed 10 bit immediate.
case Mips::BI__builtin_msa_ldi_b: i = 0; l = -128; u = 255; break;
case Mips::BI__builtin_msa_ldi_h:
case Mips::BI__builtin_msa_ldi_w:
case Mips::BI__builtin_msa_ldi_d: i = 0; l = -512; u = 511; break;
case Mips::BI__builtin_msa_ld_b: i = 1; l = -512; u = 511; m = 1; break;
case Mips::BI__builtin_msa_ld_h: i = 1; l = -1024; u = 1022; m = 2; break;
case Mips::BI__builtin_msa_ld_w: i = 1; l = -2048; u = 2044; m = 4; break;
case Mips::BI__builtin_msa_ld_d: i = 1; l = -4096; u = 4088; m = 8; break;
case Mips::BI__builtin_msa_ldr_d: i = 1; l = -4096; u = 4088; m = 8; break;
case Mips::BI__builtin_msa_ldr_w: i = 1; l = -2048; u = 2044; m = 4; break;
case Mips::BI__builtin_msa_st_b: i = 2; l = -512; u = 511; m = 1; break;
case Mips::BI__builtin_msa_st_h: i = 2; l = -1024; u = 1022; m = 2; break;
case Mips::BI__builtin_msa_st_w: i = 2; l = -2048; u = 2044; m = 4; break;
case Mips::BI__builtin_msa_st_d: i = 2; l = -4096; u = 4088; m = 8; break;
case Mips::BI__builtin_msa_str_d: i = 2; l = -4096; u = 4088; m = 8; break;
case Mips::BI__builtin_msa_str_w: i = 2; l = -2048; u = 2044; m = 4; break;
}
if (!m)
return SemaBuiltinConstantArgRange(TheCall, i, l, u);
return SemaBuiltinConstantArgRange(TheCall, i, l, u) ||
SemaBuiltinConstantArgMultiple(TheCall, i, m);
}
bool Sema::CheckPPCBuiltinFunctionCall(const TargetInfo &TI, unsigned BuiltinID,
CallExpr *TheCall) {
unsigned i = 0, l = 0, u = 0;
bool Is64BitBltin = BuiltinID == PPC::BI__builtin_divde ||
BuiltinID == PPC::BI__builtin_divdeu ||
BuiltinID == PPC::BI__builtin_bpermd;
bool IsTarget64Bit = TI.getTypeWidth(TI.getIntPtrType()) == 64;
bool IsBltinExtDiv = BuiltinID == PPC::BI__builtin_divwe ||
BuiltinID == PPC::BI__builtin_divweu ||
BuiltinID == PPC::BI__builtin_divde ||
BuiltinID == PPC::BI__builtin_divdeu;
if (Is64BitBltin && !IsTarget64Bit)
return Diag(TheCall->getBeginLoc(), diag::err_64_bit_builtin_32_bit_tgt)
<< TheCall->getSourceRange();
if ((IsBltinExtDiv && !TI.hasFeature("extdiv")) ||
(BuiltinID == PPC::BI__builtin_bpermd && !TI.hasFeature("bpermd")))
return Diag(TheCall->getBeginLoc(), diag::err_ppc_builtin_only_on_pwr7)
<< TheCall->getSourceRange();
auto SemaVSXCheck = [&](CallExpr *TheCall) -> bool {
if (!TI.hasFeature("vsx"))
return Diag(TheCall->getBeginLoc(), diag::err_ppc_builtin_only_on_pwr7)
<< TheCall->getSourceRange();
return false;
};
switch (BuiltinID) {
default: return false;
case PPC::BI__builtin_altivec_crypto_vshasigmaw:
case PPC::BI__builtin_altivec_crypto_vshasigmad:
return SemaBuiltinConstantArgRange(TheCall, 1, 0, 1) ||
SemaBuiltinConstantArgRange(TheCall, 2, 0, 15);
case PPC::BI__builtin_altivec_dss:
return SemaBuiltinConstantArgRange(TheCall, 0, 0, 3);
case PPC::BI__builtin_tbegin:
case PPC::BI__builtin_tend: i = 0; l = 0; u = 1; break;
case PPC::BI__builtin_tsr: i = 0; l = 0; u = 7; break;
case PPC::BI__builtin_tabortwc:
case PPC::BI__builtin_tabortdc: i = 0; l = 0; u = 31; break;
case PPC::BI__builtin_tabortwci:
case PPC::BI__builtin_tabortdci:
return SemaBuiltinConstantArgRange(TheCall, 0, 0, 31) ||
SemaBuiltinConstantArgRange(TheCall, 2, 0, 31);
case PPC::BI__builtin_altivec_dst:
case PPC::BI__builtin_altivec_dstt:
case PPC::BI__builtin_altivec_dstst:
case PPC::BI__builtin_altivec_dststt:
return SemaBuiltinConstantArgRange(TheCall, 2, 0, 3);
case PPC::BI__builtin_vsx_xxpermdi:
case PPC::BI__builtin_vsx_xxsldwi:
return SemaBuiltinVSX(TheCall);
case PPC::BI__builtin_unpack_vector_int128:
return SemaVSXCheck(TheCall) ||
SemaBuiltinConstantArgRange(TheCall, 1, 0, 1);
case PPC::BI__builtin_pack_vector_int128:
return SemaVSXCheck(TheCall);
case PPC::BI__builtin_altivec_vgnb:
return SemaBuiltinConstantArgRange(TheCall, 1, 2, 7);
case PPC::BI__builtin_vsx_xxeval:
return SemaBuiltinConstantArgRange(TheCall, 3, 0, 255);
case PPC::BI__builtin_altivec_vsldbi:
return SemaBuiltinConstantArgRange(TheCall, 2, 0, 7);
case PPC::BI__builtin_altivec_vsrdbi:
return SemaBuiltinConstantArgRange(TheCall, 2, 0, 7);
case PPC::BI__builtin_vsx_xxpermx:
return SemaBuiltinConstantArgRange(TheCall, 3, 0, 7);
}
return SemaBuiltinConstantArgRange(TheCall, i, l, u);
}
bool Sema::CheckAMDGCNBuiltinFunctionCall(unsigned BuiltinID,
CallExpr *TheCall) {
// position of memory order and scope arguments in the builtin
unsigned OrderIndex, ScopeIndex;
switch (BuiltinID) {
case AMDGPU::BI__builtin_amdgcn_atomic_inc32:
case AMDGPU::BI__builtin_amdgcn_atomic_inc64:
case AMDGPU::BI__builtin_amdgcn_atomic_dec32:
case AMDGPU::BI__builtin_amdgcn_atomic_dec64:
OrderIndex = 2;
ScopeIndex = 3;
break;
case AMDGPU::BI__builtin_amdgcn_fence:
OrderIndex = 0;
ScopeIndex = 1;
break;
default:
return false;
}
ExprResult Arg = TheCall->getArg(OrderIndex);
auto ArgExpr = Arg.get();
Expr::EvalResult ArgResult;
if (!ArgExpr->EvaluateAsInt(ArgResult, Context))
return Diag(ArgExpr->getExprLoc(), diag::err_typecheck_expect_int)
<< ArgExpr->getType();
int ord = ArgResult.Val.getInt().getZExtValue();
// Check valididty of memory ordering as per C11 / C++11's memody model.
switch (static_cast<llvm::AtomicOrderingCABI>(ord)) {
case llvm::AtomicOrderingCABI::acquire:
case llvm::AtomicOrderingCABI::release:
case llvm::AtomicOrderingCABI::acq_rel:
case llvm::AtomicOrderingCABI::seq_cst:
break;
default: {
return Diag(ArgExpr->getBeginLoc(),
diag::warn_atomic_op_has_invalid_memory_order)
<< ArgExpr->getSourceRange();
}
}
Arg = TheCall->getArg(ScopeIndex);
ArgExpr = Arg.get();
Expr::EvalResult ArgResult1;
// Check that sync scope is a constant literal
if (!ArgExpr->EvaluateAsConstantExpr(ArgResult1, Expr::EvaluateForCodeGen,
Context))
return Diag(ArgExpr->getExprLoc(), diag::err_expr_not_string_literal)
<< ArgExpr->getType();
return false;
}
bool Sema::CheckSystemZBuiltinFunctionCall(unsigned BuiltinID,
CallExpr *TheCall) {
if (BuiltinID == SystemZ::BI__builtin_tabort) {
Expr *Arg = TheCall->getArg(0);
if (Optional<llvm::APSInt> AbortCode = Arg->getIntegerConstantExpr(Context))
if (AbortCode->getSExtValue() >= 0 && AbortCode->getSExtValue() < 256)
return Diag(Arg->getBeginLoc(), diag::err_systemz_invalid_tabort_code)
<< Arg->getSourceRange();
}
// For intrinsics which take an immediate value as part of the instruction,
// range check them here.
unsigned i = 0, l = 0, u = 0;
switch (BuiltinID) {
default: return false;
case SystemZ::BI__builtin_s390_lcbb: i = 1; l = 0; u = 15; break;
case SystemZ::BI__builtin_s390_verimb:
case SystemZ::BI__builtin_s390_verimh:
case SystemZ::BI__builtin_s390_verimf:
case SystemZ::BI__builtin_s390_verimg: i = 3; l = 0; u = 255; break;
case SystemZ::BI__builtin_s390_vfaeb:
case SystemZ::BI__builtin_s390_vfaeh:
case SystemZ::BI__builtin_s390_vfaef:
case SystemZ::BI__builtin_s390_vfaebs:
case SystemZ::BI__builtin_s390_vfaehs:
case SystemZ::BI__builtin_s390_vfaefs:
case SystemZ::BI__builtin_s390_vfaezb:
case SystemZ::BI__builtin_s390_vfaezh:
case SystemZ::BI__builtin_s390_vfaezf:
case SystemZ::BI__builtin_s390_vfaezbs:
case SystemZ::BI__builtin_s390_vfaezhs:
case SystemZ::BI__builtin_s390_vfaezfs: i = 2; l = 0; u = 15; break;
case SystemZ::BI__builtin_s390_vfisb:
case SystemZ::BI__builtin_s390_vfidb:
return SemaBuiltinConstantArgRange(TheCall, 1, 0, 15) ||
SemaBuiltinConstantArgRange(TheCall, 2, 0, 15);
case SystemZ::BI__builtin_s390_vftcisb:
case SystemZ::BI__builtin_s390_vftcidb: i = 1; l = 0; u = 4095; break;
case SystemZ::BI__builtin_s390_vlbb: i = 1; l = 0; u = 15; break;
case SystemZ::BI__builtin_s390_vpdi: i = 2; l = 0; u = 15; break;
case SystemZ::BI__builtin_s390_vsldb: i = 2; l = 0; u = 15; break;
case SystemZ::BI__builtin_s390_vstrcb:
case SystemZ::BI__builtin_s390_vstrch:
case SystemZ::BI__builtin_s390_vstrcf:
case SystemZ::BI__builtin_s390_vstrczb:
case SystemZ::BI__builtin_s390_vstrczh:
case SystemZ::BI__builtin_s390_vstrczf:
case SystemZ::BI__builtin_s390_vstrcbs:
case SystemZ::BI__builtin_s390_vstrchs:
case SystemZ::BI__builtin_s390_vstrcfs:
case SystemZ::BI__builtin_s390_vstrczbs:
case SystemZ::BI__builtin_s390_vstrczhs:
case SystemZ::BI__builtin_s390_vstrczfs: i = 3; l = 0; u = 15; break;
case SystemZ::BI__builtin_s390_vmslg: i = 3; l = 0; u = 15; break;
case SystemZ::BI__builtin_s390_vfminsb:
case SystemZ::BI__builtin_s390_vfmaxsb:
case SystemZ::BI__builtin_s390_vfmindb:
case SystemZ::BI__builtin_s390_vfmaxdb: i = 2; l = 0; u = 15; break;
case SystemZ::BI__builtin_s390_vsld: i = 2; l = 0; u = 7; break;
case SystemZ::BI__builtin_s390_vsrd: i = 2; l = 0; u = 7; break;
}
return SemaBuiltinConstantArgRange(TheCall, i, l, u);
}
/// SemaBuiltinCpuSupports - Handle __builtin_cpu_supports(char *).
/// This checks that the target supports __builtin_cpu_supports and
/// that the string argument is constant and valid.
static bool SemaBuiltinCpuSupports(Sema &S, const TargetInfo &TI,
CallExpr *TheCall) {
Expr *Arg = TheCall->getArg(0);
// Check if the argument is a string literal.
if (!isa<StringLiteral>(Arg->IgnoreParenImpCasts()))
return S.Diag(TheCall->getBeginLoc(), diag::err_expr_not_string_literal)
<< Arg->getSourceRange();
// Check the contents of the string.
StringRef Feature =
cast<StringLiteral>(Arg->IgnoreParenImpCasts())->getString();
if (!TI.validateCpuSupports(Feature))
return S.Diag(TheCall->getBeginLoc(), diag::err_invalid_cpu_supports)
<< Arg->getSourceRange();
return false;
}
/// SemaBuiltinCpuIs - Handle __builtin_cpu_is(char *).
/// This checks that the target supports __builtin_cpu_is and
/// that the string argument is constant and valid.
static bool SemaBuiltinCpuIs(Sema &S, const TargetInfo &TI, CallExpr *TheCall) {
Expr *Arg = TheCall->getArg(0);
// Check if the argument is a string literal.
if (!isa<StringLiteral>(Arg->IgnoreParenImpCasts()))
return S.Diag(TheCall->getBeginLoc(), diag::err_expr_not_string_literal)
<< Arg->getSourceRange();
// Check the contents of the string.
StringRef Feature =
cast<StringLiteral>(Arg->IgnoreParenImpCasts())->getString();
if (!TI.validateCpuIs(Feature))
return S.Diag(TheCall->getBeginLoc(), diag::err_invalid_cpu_is)
<< Arg->getSourceRange();
return false;
}
// Check if the rounding mode is legal.
bool Sema::CheckX86BuiltinRoundingOrSAE(unsigned BuiltinID, CallExpr *TheCall) {
// Indicates if this instruction has rounding control or just SAE.
bool HasRC = false;
unsigned ArgNum = 0;
switch (BuiltinID) {
default:
return false;
case X86::BI__builtin_ia32_vcvttsd2si32:
case X86::BI__builtin_ia32_vcvttsd2si64:
case X86::BI__builtin_ia32_vcvttsd2usi32:
case X86::BI__builtin_ia32_vcvttsd2usi64:
case X86::BI__builtin_ia32_vcvttss2si32:
case X86::BI__builtin_ia32_vcvttss2si64:
case X86::BI__builtin_ia32_vcvttss2usi32:
case X86::BI__builtin_ia32_vcvttss2usi64:
ArgNum = 1;
break;
case X86::BI__builtin_ia32_maxpd512:
case X86::BI__builtin_ia32_maxps512:
case X86::BI__builtin_ia32_minpd512:
case X86::BI__builtin_ia32_minps512:
ArgNum = 2;
break;
case X86::BI__builtin_ia32_cvtps2pd512_mask:
case X86::BI__builtin_ia32_cvttpd2dq512_mask:
case X86::BI__builtin_ia32_cvttpd2qq512_mask:
case X86::BI__builtin_ia32_cvttpd2udq512_mask:
case X86::BI__builtin_ia32_cvttpd2uqq512_mask:
case X86::BI__builtin_ia32_cvttps2dq512_mask:
case X86::BI__builtin_ia32_cvttps2qq512_mask:
case X86::BI__builtin_ia32_cvttps2udq512_mask:
case X86::BI__builtin_ia32_cvttps2uqq512_mask:
case X86::BI__builtin_ia32_exp2pd_mask:
case X86::BI__builtin_ia32_exp2ps_mask:
case X86::BI__builtin_ia32_getexppd512_mask:
case X86::BI__builtin_ia32_getexpps512_mask:
case X86::BI__builtin_ia32_rcp28pd_mask:
case X86::BI__builtin_ia32_rcp28ps_mask:
case X86::BI__builtin_ia32_rsqrt28pd_mask:
case X86::BI__builtin_ia32_rsqrt28ps_mask:
case X86::BI__builtin_ia32_vcomisd:
case X86::BI__builtin_ia32_vcomiss:
case X86::BI__builtin_ia32_vcvtph2ps512_mask:
ArgNum = 3;
break;
case X86::BI__builtin_ia32_cmppd512_mask:
case X86::BI__builtin_ia32_cmpps512_mask:
case X86::BI__builtin_ia32_cmpsd_mask:
case X86::BI__builtin_ia32_cmpss_mask:
case X86::BI__builtin_ia32_cvtss2sd_round_mask:
case X86::BI__builtin_ia32_getexpsd128_round_mask:
case X86::BI__builtin_ia32_getexpss128_round_mask:
case X86::BI__builtin_ia32_getmantpd512_mask:
case X86::BI__builtin_ia32_getmantps512_mask:
case X86::BI__builtin_ia32_maxsd_round_mask:
case X86::BI__builtin_ia32_maxss_round_mask:
case X86::BI__builtin_ia32_minsd_round_mask:
case X86::BI__builtin_ia32_minss_round_mask:
case X86::BI__builtin_ia32_rcp28sd_round_mask:
case X86::BI__builtin_ia32_rcp28ss_round_mask:
case X86::BI__builtin_ia32_reducepd512_mask:
case X86::BI__builtin_ia32_reduceps512_mask:
case X86::BI__builtin_ia32_rndscalepd_mask:
case X86::BI__builtin_ia32_rndscaleps_mask:
case X86::BI__builtin_ia32_rsqrt28sd_round_mask:
case X86::BI__builtin_ia32_rsqrt28ss_round_mask:
ArgNum = 4;
break;
case X86::BI__builtin_ia32_fixupimmpd512_mask:
case X86::BI__builtin_ia32_fixupimmpd512_maskz:
case X86::BI__builtin_ia32_fixupimmps512_mask:
case X86::BI__builtin_ia32_fixupimmps512_maskz:
case X86::BI__builtin_ia32_fixupimmsd_mask:
case X86::BI__builtin_ia32_fixupimmsd_maskz:
case X86::BI__builtin_ia32_fixupimmss_mask:
case X86::BI__builtin_ia32_fixupimmss_maskz:
case X86::BI__builtin_ia32_getmantsd_round_mask:
case X86::BI__builtin_ia32_getmantss_round_mask:
case X86::BI__builtin_ia32_rangepd512_mask:
case X86::BI__builtin_ia32_rangeps512_mask:
case X86::BI__builtin_ia32_rangesd128_round_mask:
case X86::BI__builtin_ia32_rangess128_round_mask:
case X86::BI__builtin_ia32_reducesd_mask:
case X86::BI__builtin_ia32_reducess_mask:
case X86::BI__builtin_ia32_rndscalesd_round_mask:
case X86::BI__builtin_ia32_rndscaless_round_mask:
ArgNum = 5;
break;
case X86::BI__builtin_ia32_vcvtsd2si64:
case X86::BI__builtin_ia32_vcvtsd2si32:
case X86::BI__builtin_ia32_vcvtsd2usi32:
case X86::BI__builtin_ia32_vcvtsd2usi64:
case X86::BI__builtin_ia32_vcvtss2si32:
case X86::BI__builtin_ia32_vcvtss2si64:
case X86::BI__builtin_ia32_vcvtss2usi32:
case X86::BI__builtin_ia32_vcvtss2usi64:
case X86::BI__builtin_ia32_sqrtpd512:
case X86::BI__builtin_ia32_sqrtps512:
ArgNum = 1;
HasRC = true;
break;
case X86::BI__builtin_ia32_addpd512:
case X86::BI__builtin_ia32_addps512:
case X86::BI__builtin_ia32_divpd512:
case X86::BI__builtin_ia32_divps512:
case X86::BI__builtin_ia32_mulpd512:
case X86::BI__builtin_ia32_mulps512:
case X86::BI__builtin_ia32_subpd512:
case X86::BI__builtin_ia32_subps512:
case X86::BI__builtin_ia32_cvtsi2sd64:
case X86::BI__builtin_ia32_cvtsi2ss32:
case X86::BI__builtin_ia32_cvtsi2ss64:
case X86::BI__builtin_ia32_cvtusi2sd64:
case X86::BI__builtin_ia32_cvtusi2ss32:
case X86::BI__builtin_ia32_cvtusi2ss64:
ArgNum = 2;
HasRC = true;
break;
case X86::BI__builtin_ia32_cvtdq2ps512_mask:
case X86::BI__builtin_ia32_cvtudq2ps512_mask:
case X86::BI__builtin_ia32_cvtpd2ps512_mask:
case X86::BI__builtin_ia32_cvtpd2dq512_mask:
case X86::BI__builtin_ia32_cvtpd2qq512_mask:
case X86::BI__builtin_ia32_cvtpd2udq512_mask:
case X86::BI__builtin_ia32_cvtpd2uqq512_mask:
case X86::BI__builtin_ia32_cvtps2dq512_mask:
case X86::BI__builtin_ia32_cvtps2qq512_mask:
case X86::BI__builtin_ia32_cvtps2udq512_mask:
case X86::BI__builtin_ia32_cvtps2uqq512_mask:
case X86::BI__builtin_ia32_cvtqq2pd512_mask:
case X86::BI__builtin_ia32_cvtqq2ps512_mask:
case X86::BI__builtin_ia32_cvtuqq2pd512_mask:
case X86::BI__builtin_ia32_cvtuqq2ps512_mask:
ArgNum = 3;
HasRC = true;
break;
case X86::BI__builtin_ia32_addss_round_mask:
case X86::BI__builtin_ia32_addsd_round_mask:
case X86::BI__builtin_ia32_divss_round_mask:
case X86::BI__builtin_ia32_divsd_round_mask:
case X86::BI__builtin_ia32_mulss_round_mask:
case X86::BI__builtin_ia32_mulsd_round_mask:
case X86::BI__builtin_ia32_subss_round_mask:
case X86::BI__builtin_ia32_subsd_round_mask:
case X86::BI__builtin_ia32_scalefpd512_mask:
case X86::BI__builtin_ia32_scalefps512_mask:
case X86::BI__builtin_ia32_scalefsd_round_mask:
case X86::BI__builtin_ia32_scalefss_round_mask:
case X86::BI__builtin_ia32_cvtsd2ss_round_mask:
case X86::BI__builtin_ia32_sqrtsd_round_mask:
case X86::BI__builtin_ia32_sqrtss_round_mask:
case X86::BI__builtin_ia32_vfmaddsd3_mask:
case X86::BI__builtin_ia32_vfmaddsd3_maskz:
case X86::BI__builtin_ia32_vfmaddsd3_mask3:
case X86::BI__builtin_ia32_vfmaddss3_mask:
case X86::BI__builtin_ia32_vfmaddss3_maskz:
case X86::BI__builtin_ia32_vfmaddss3_mask3:
case X86::BI__builtin_ia32_vfmaddpd512_mask:
case X86::BI__builtin_ia32_vfmaddpd512_maskz:
case X86::BI__builtin_ia32_vfmaddpd512_mask3:
case X86::BI__builtin_ia32_vfmsubpd512_mask3:
case X86::BI__builtin_ia32_vfmaddps512_mask:
case X86::BI__builtin_ia32_vfmaddps512_maskz:
case X86::BI__builtin_ia32_vfmaddps512_mask3:
case X86::BI__builtin_ia32_vfmsubps512_mask3:
case X86::BI__builtin_ia32_vfmaddsubpd512_mask:
case X86::BI__builtin_ia32_vfmaddsubpd512_maskz:
case X86::BI__builtin_ia32_vfmaddsubpd512_mask3:
case X86::BI__builtin_ia32_vfmsubaddpd512_mask3:
case X86::BI__builtin_ia32_vfmaddsubps512_mask:
case X86::BI__builtin_ia32_vfmaddsubps512_maskz:
case X86::BI__builtin_ia32_vfmaddsubps512_mask3:
case X86::BI__builtin_ia32_vfmsubaddps512_mask3:
ArgNum = 4;
HasRC = true;
break;
}
llvm::APSInt Result;
// We can't check the value of a dependent argument.
Expr *Arg = TheCall->getArg(ArgNum);
if (Arg->isTypeDependent() || Arg->isValueDependent())
return false;
// Check constant-ness first.
if (SemaBuiltinConstantArg(TheCall, ArgNum, Result))
return true;
// Make sure rounding mode is either ROUND_CUR_DIRECTION or ROUND_NO_EXC bit
// is set. If the intrinsic has rounding control(bits 1:0), make sure its only
// combined with ROUND_NO_EXC. If the intrinsic does not have rounding
// control, allow ROUND_NO_EXC and ROUND_CUR_DIRECTION together.
if (Result == 4/*ROUND_CUR_DIRECTION*/ ||
Result == 8/*ROUND_NO_EXC*/ ||
(!HasRC && Result == 12/*ROUND_CUR_DIRECTION|ROUND_NO_EXC*/) ||
(HasRC && Result.getZExtValue() >= 8 && Result.getZExtValue() <= 11))
return false;
return Diag(TheCall->getBeginLoc(), diag::err_x86_builtin_invalid_rounding)
<< Arg->getSourceRange();
}
// Check if the gather/scatter scale is legal.
bool Sema::CheckX86BuiltinGatherScatterScale(unsigned BuiltinID,
CallExpr *TheCall) {
unsigned ArgNum = 0;
switch (BuiltinID) {
default:
return false;
case X86::BI__builtin_ia32_gatherpfdpd:
case X86::BI__builtin_ia32_gatherpfdps:
case X86::BI__builtin_ia32_gatherpfqpd:
case X86::BI__builtin_ia32_gatherpfqps:
case X86::BI__builtin_ia32_scatterpfdpd:
case X86::BI__builtin_ia32_scatterpfdps:
case X86::BI__builtin_ia32_scatterpfqpd:
case X86::BI__builtin_ia32_scatterpfqps:
ArgNum = 3;
break;
case X86::BI__builtin_ia32_gatherd_pd:
case X86::BI__builtin_ia32_gatherd_pd256:
case X86::BI__builtin_ia32_gatherq_pd:
case X86::BI__builtin_ia32_gatherq_pd256:
case X86::BI__builtin_ia32_gatherd_ps:
case X86::BI__builtin_ia32_gatherd_ps256:
case X86::BI__builtin_ia32_gatherq_ps:
case X86::BI__builtin_ia32_gatherq_ps256:
case X86::BI__builtin_ia32_gatherd_q:
case X86::BI__builtin_ia32_gatherd_q256:
case X86::BI__builtin_ia32_gatherq_q:
case X86::BI__builtin_ia32_gatherq_q256:
case X86::BI__builtin_ia32_gatherd_d:
case X86::BI__builtin_ia32_gatherd_d256:
case X86::BI__builtin_ia32_gatherq_d:
case X86::BI__builtin_ia32_gatherq_d256:
case X86::BI__builtin_ia32_gather3div2df:
case X86::BI__builtin_ia32_gather3div2di:
case X86::BI__builtin_ia32_gather3div4df:
case X86::BI__builtin_ia32_gather3div4di:
case X86::BI__builtin_ia32_gather3div4sf:
case X86::BI__builtin_ia32_gather3div4si:
case X86::BI__builtin_ia32_gather3div8sf:
case X86::BI__builtin_ia32_gather3div8si:
case X86::BI__builtin_ia32_gather3siv2df:
case X86::BI__builtin_ia32_gather3siv2di:
case X86::BI__builtin_ia32_gather3siv4df:
case X86::BI__builtin_ia32_gather3siv4di:
case X86::BI__builtin_ia32_gather3siv4sf:
case X86::BI__builtin_ia32_gather3siv4si:
case X86::BI__builtin_ia32_gather3siv8sf:
case X86::BI__builtin_ia32_gather3siv8si:
case X86::BI__builtin_ia32_gathersiv8df:
case X86::BI__builtin_ia32_gathersiv16sf:
case X86::BI__builtin_ia32_gatherdiv8df:
case X86::BI__builtin_ia32_gatherdiv16sf:
case X86::BI__builtin_ia32_gathersiv8di:
case X86::BI__builtin_ia32_gathersiv16si:
case X86::BI__builtin_ia32_gatherdiv8di:
case X86::BI__builtin_ia32_gatherdiv16si:
case X86::BI__builtin_ia32_scatterdiv2df:
case X86::BI__builtin_ia32_scatterdiv2di:
case X86::BI__builtin_ia32_scatterdiv4df:
case X86::BI__builtin_ia32_scatterdiv4di:
case X86::BI__builtin_ia32_scatterdiv4sf:
case X86::BI__builtin_ia32_scatterdiv4si:
case X86::BI__builtin_ia32_scatterdiv8sf:
case X86::BI__builtin_ia32_scatterdiv8si:
case X86::BI__builtin_ia32_scattersiv2df:
case X86::BI__builtin_ia32_scattersiv2di:
case X86::BI__builtin_ia32_scattersiv4df:
case X86::BI__builtin_ia32_scattersiv4di:
case X86::BI__builtin_ia32_scattersiv4sf:
case X86::BI__builtin_ia32_scattersiv4si:
case X86::BI__builtin_ia32_scattersiv8sf:
case X86::BI__builtin_ia32_scattersiv8si:
case X86::BI__builtin_ia32_scattersiv8df:
case X86::BI__builtin_ia32_scattersiv16sf:
case X86::BI__builtin_ia32_scatterdiv8df:
case X86::BI__builtin_ia32_scatterdiv16sf:
case X86::BI__builtin_ia32_scattersiv8di:
case X86::BI__builtin_ia32_scattersiv16si:
case X86::BI__builtin_ia32_scatterdiv8di:
case X86::BI__builtin_ia32_scatterdiv16si:
ArgNum = 4;
break;
}
llvm::APSInt Result;
// We can't check the value of a dependent argument.
Expr *Arg = TheCall->getArg(ArgNum);
if (Arg->isTypeDependent() || Arg->isValueDependent())
return false;
// Check constant-ness first.
if (SemaBuiltinConstantArg(TheCall, ArgNum, Result))
return true;
if (Result == 1 || Result == 2 || Result == 4 || Result == 8)
return false;
return Diag(TheCall->getBeginLoc(), diag::err_x86_builtin_invalid_scale)
<< Arg->getSourceRange();
}
enum { TileRegLow = 0, TileRegHigh = 7 };
bool Sema::CheckX86BuiltinTileArgumentsRange(CallExpr *TheCall,
ArrayRef<int> ArgNums) {
for (int ArgNum : ArgNums) {
if (SemaBuiltinConstantArgRange(TheCall, ArgNum, TileRegLow, TileRegHigh))
return true;
}
return false;
}
bool Sema::CheckX86BuiltinTileDuplicate(CallExpr *TheCall,
ArrayRef<int> ArgNums) {
// Because the max number of tile register is TileRegHigh + 1, so here we use
// each bit to represent the usage of them in bitset.
std::bitset<TileRegHigh + 1> ArgValues;
for (int ArgNum : ArgNums) {
Expr *Arg = TheCall->getArg(ArgNum);
if (Arg->isTypeDependent() || Arg->isValueDependent())
continue;
llvm::APSInt Result;
if (SemaBuiltinConstantArg(TheCall, ArgNum, Result))
return true;
int ArgExtValue = Result.getExtValue();
assert((ArgExtValue >= TileRegLow || ArgExtValue <= TileRegHigh) &&
"Incorrect tile register num.");
if (ArgValues.test(ArgExtValue))
return Diag(TheCall->getBeginLoc(),
diag::err_x86_builtin_tile_arg_duplicate)
<< TheCall->getArg(ArgNum)->getSourceRange();
ArgValues.set(ArgExtValue);
}
return false;
}
bool Sema::CheckX86BuiltinTileRangeAndDuplicate(CallExpr *TheCall,
ArrayRef<int> ArgNums) {
return CheckX86BuiltinTileArgumentsRange(TheCall, ArgNums) ||
CheckX86BuiltinTileDuplicate(TheCall, ArgNums);
}
bool Sema::CheckX86BuiltinTileArguments(unsigned BuiltinID, CallExpr *TheCall) {
switch (BuiltinID) {
default:
return false;
case X86::BI__builtin_ia32_tileloadd64:
case X86::BI__builtin_ia32_tileloaddt164:
case X86::BI__builtin_ia32_tilestored64:
case X86::BI__builtin_ia32_tilezero:
return CheckX86BuiltinTileArgumentsRange(TheCall, 0);
case X86::BI__builtin_ia32_tdpbssd:
case X86::BI__builtin_ia32_tdpbsud:
case X86::BI__builtin_ia32_tdpbusd:
case X86::BI__builtin_ia32_tdpbuud:
case X86::BI__builtin_ia32_tdpbf16ps:
return CheckX86BuiltinTileRangeAndDuplicate(TheCall, {0, 1, 2});
}
}
static bool isX86_32Builtin(unsigned BuiltinID) {
// These builtins only work on x86-32 targets.
switch (BuiltinID) {
case X86::BI__builtin_ia32_readeflags_u32:
case X86::BI__builtin_ia32_writeeflags_u32:
return true;
}
return false;
}
bool Sema::CheckX86BuiltinFunctionCall(const TargetInfo &TI, unsigned BuiltinID,
CallExpr *TheCall) {
if (BuiltinID == X86::BI__builtin_cpu_supports)
return SemaBuiltinCpuSupports(*this, TI, TheCall);
if (BuiltinID == X86::BI__builtin_cpu_is)
return SemaBuiltinCpuIs(*this, TI, TheCall);
// Check for 32-bit only builtins on a 64-bit target.
const llvm::Triple &TT = TI.getTriple();
if (TT.getArch() != llvm::Triple::x86 && isX86_32Builtin(BuiltinID))
return Diag(TheCall->getCallee()->getBeginLoc(),
diag::err_32_bit_builtin_64_bit_tgt);
// If the intrinsic has rounding or SAE make sure its valid.
if (CheckX86BuiltinRoundingOrSAE(BuiltinID, TheCall))
return true;
// If the intrinsic has a gather/scatter scale immediate make sure its valid.
if (CheckX86BuiltinGatherScatterScale(BuiltinID, TheCall))
return true;
// If the intrinsic has a tile arguments, make sure they are valid.
if (CheckX86BuiltinTileArguments(BuiltinID, TheCall))
return true;
// For intrinsics which take an immediate value as part of the instruction,
// range check them here.
int i = 0, l = 0, u = 0;
switch (BuiltinID) {
default:
return false;
case X86::BI__builtin_ia32_vec_ext_v2si:
case X86::BI__builtin_ia32_vec_ext_v2di:
case X86::BI__builtin_ia32_vextractf128_pd256:
case X86::BI__builtin_ia32_vextractf128_ps256:
case X86::BI__builtin_ia32_vextractf128_si256:
case X86::BI__builtin_ia32_extract128i256:
case X86::BI__builtin_ia32_extractf64x4_mask:
case X86::BI__builtin_ia32_extracti64x4_mask:
case X86::BI__builtin_ia32_extractf32x8_mask:
case X86::BI__builtin_ia32_extracti32x8_mask:
case X86::BI__builtin_ia32_extractf64x2_256_mask:
case X86::BI__builtin_ia32_extracti64x2_256_mask:
case X86::BI__builtin_ia32_extractf32x4_256_mask:
case X86::BI__builtin_ia32_extracti32x4_256_mask:
i = 1; l = 0; u = 1;
break;
case X86::BI__builtin_ia32_vec_set_v2di:
case X86::BI__builtin_ia32_vinsertf128_pd256:
case X86::BI__builtin_ia32_vinsertf128_ps256:
case X86::BI__builtin_ia32_vinsertf128_si256:
case X86::BI__builtin_ia32_insert128i256:
case X86::BI__builtin_ia32_insertf32x8:
case X86::BI__builtin_ia32_inserti32x8:
case X86::BI__builtin_ia32_insertf64x4:
case X86::BI__builtin_ia32_inserti64x4:
case X86::BI__builtin_ia32_insertf64x2_256:
case X86::BI__builtin_ia32_inserti64x2_256:
case X86::BI__builtin_ia32_insertf32x4_256:
case X86::BI__builtin_ia32_inserti32x4_256:
i = 2; l = 0; u = 1;
break;
case X86::BI__builtin_ia32_vpermilpd:
case X86::BI__builtin_ia32_vec_ext_v4hi:
case X86::BI__builtin_ia32_vec_ext_v4si:
case X86::BI__builtin_ia32_vec_ext_v4sf:
case X86::BI__builtin_ia32_vec_ext_v4di:
case X86::BI__builtin_ia32_extractf32x4_mask:
case X86::BI__builtin_ia32_extracti32x4_mask:
case X86::BI__builtin_ia32_extractf64x2_512_mask:
case X86::BI__builtin_ia32_extracti64x2_512_mask:
i = 1; l = 0; u = 3;
break;
case X86::BI_mm_prefetch:
case X86::BI__builtin_ia32_vec_ext_v8hi:
case X86::BI__builtin_ia32_vec_ext_v8si:
i = 1; l = 0; u = 7;
break;
case X86::BI__builtin_ia32_sha1rnds4:
case X86::BI__builtin_ia32_blendpd:
case X86::BI__builtin_ia32_shufpd:
case X86::BI__builtin_ia32_vec_set_v4hi:
case X86::BI__builtin_ia32_vec_set_v4si:
case X86::BI__builtin_ia32_vec_set_v4di:
case X86::BI__builtin_ia32_shuf_f32x4_256:
case X86::BI__builtin_ia32_shuf_f64x2_256:
case X86::BI__builtin_ia32_shuf_i32x4_256:
case X86::BI__builtin_ia32_shuf_i64x2_256:
case X86::BI__builtin_ia32_insertf64x2_512:
case X86::BI__builtin_ia32_inserti64x2_512:
case X86::BI__builtin_ia32_insertf32x4:
case X86::BI__builtin_ia32_inserti32x4:
i = 2; l = 0; u = 3;
break;
case X86::BI__builtin_ia32_vpermil2pd:
case X86::BI__builtin_ia32_vpermil2pd256:
case X86::BI__builtin_ia32_vpermil2ps:
case X86::BI__builtin_ia32_vpermil2ps256:
i = 3; l = 0; u = 3;
break;
case X86::BI__builtin_ia32_cmpb128_mask:
case X86::BI__builtin_ia32_cmpw128_mask:
case X86::BI__builtin_ia32_cmpd128_mask:
case X86::BI__builtin_ia32_cmpq128_mask:
case X86::BI__builtin_ia32_cmpb256_mask:
case X86::BI__builtin_ia32_cmpw256_mask:
case X86::BI__builtin_ia32_cmpd256_mask:
case X86::BI__builtin_ia32_cmpq256_mask:
case X86::BI__builtin_ia32_cmpb512_mask:
case X86::BI__builtin_ia32_cmpw512_mask:
case X86::BI__builtin_ia32_cmpd512_mask:
case X86::BI__builtin_ia32_cmpq512_mask:
case X86::BI__builtin_ia32_ucmpb128_mask:
case X86::BI__builtin_ia32_ucmpw128_mask:
case X86::BI__builtin_ia32_ucmpd128_mask:
case X86::BI__builtin_ia32_ucmpq128_mask:
case X86::BI__builtin_ia32_ucmpb256_mask:
case X86::BI__builtin_ia32_ucmpw256_mask:
case X86::BI__builtin_ia32_ucmpd256_mask:
case X86::BI__builtin_ia32_ucmpq256_mask:
case X86::BI__builtin_ia32_ucmpb512_mask:
case X86::BI__builtin_ia32_ucmpw512_mask:
case X86::BI__builtin_ia32_ucmpd512_mask:
case X86::BI__builtin_ia32_ucmpq512_mask:
case X86::BI__builtin_ia32_vpcomub:
case X86::BI__builtin_ia32_vpcomuw:
case X86::BI__builtin_ia32_vpcomud:
case X86::BI__builtin_ia32_vpcomuq:
case X86::BI__builtin_ia32_vpcomb:
case X86::BI__builtin_ia32_vpcomw:
case X86::BI__builtin_ia32_vpcomd:
case X86::BI__builtin_ia32_vpcomq:
case X86::BI__builtin_ia32_vec_set_v8hi:
case X86::BI__builtin_ia32_vec_set_v8si:
i = 2; l = 0; u = 7;
break;
case X86::BI__builtin_ia32_vpermilpd256:
case X86::BI__builtin_ia32_roundps:
case X86::BI__builtin_ia32_roundpd:
case X86::BI__builtin_ia32_roundps256:
case X86::BI__builtin_ia32_roundpd256:
case X86::BI__builtin_ia32_getmantpd128_mask:
case X86::BI__builtin_ia32_getmantpd256_mask:
case X86::BI__builtin_ia32_getmantps128_mask:
case X86::BI__builtin_ia32_getmantps256_mask:
case X86::BI__builtin_ia32_getmantpd512_mask:
case X86::BI__builtin_ia32_getmantps512_mask:
case X86::BI__builtin_ia32_vec_ext_v16qi:
case X86::BI__builtin_ia32_vec_ext_v16hi:
i = 1; l = 0; u = 15;
break;
case X86::BI__builtin_ia32_pblendd128:
case X86::BI__builtin_ia32_blendps:
case X86::BI__builtin_ia32_blendpd256:
case X86::BI__builtin_ia32_shufpd256:
case X86::BI__builtin_ia32_roundss:
case X86::BI__builtin_ia32_roundsd:
case X86::BI__builtin_ia32_rangepd128_mask:
case X86::BI__builtin_ia32_rangepd256_mask:
case X86::BI__builtin_ia32_rangepd512_mask:
case X86::BI__builtin_ia32_rangeps128_mask:
case X86::BI__builtin_ia32_rangeps256_mask:
case X86::BI__builtin_ia32_rangeps512_mask:
case X86::BI__builtin_ia32_getmantsd_round_mask:
case X86::BI__builtin_ia32_getmantss_round_mask:
case X86::BI__builtin_ia32_vec_set_v16qi:
case X86::BI__builtin_ia32_vec_set_v16hi:
i = 2; l = 0; u = 15;
break;
case X86::BI__builtin_ia32_vec_ext_v32qi:
i = 1; l = 0; u = 31;
break;
case X86::BI__builtin_ia32_cmpps:
case X86::BI__builtin_ia32_cmpss:
case X86::BI__builtin_ia32_cmppd:
case X86::BI__builtin_ia32_cmpsd:
case X86::BI__builtin_ia32_cmpps256:
case X86::BI__builtin_ia32_cmppd256:
case X86::BI__builtin_ia32_cmpps128_mask:
case X86::BI__builtin_ia32_cmppd128_mask:
case X86::BI__builtin_ia32_cmpps256_mask:
case X86::BI__builtin_ia32_cmppd256_mask:
case X86::BI__builtin_ia32_cmpps512_mask:
case X86::BI__builtin_ia32_cmppd512_mask:
case X86::BI__builtin_ia32_cmpsd_mask:
case X86::BI__builtin_ia32_cmpss_mask:
case X86::BI__builtin_ia32_vec_set_v32qi:
i = 2; l = 0; u = 31;
break;
case X86::BI__builtin_ia32_permdf256:
case X86::BI__builtin_ia32_permdi256:
case X86::BI__builtin_ia32_permdf512:
case X86::BI__builtin_ia32_permdi512:
case X86::BI__builtin_ia32_vpermilps:
case X86::BI__builtin_ia32_vpermilps256:
case X86::BI__builtin_ia32_vpermilpd512:
case X86::BI__builtin_ia32_vpermilps512:
case X86::BI__builtin_ia32_pshufd:
case X86::BI__builtin_ia32_pshufd256:
case X86::BI__builtin_ia32_pshufd512:
case X86::BI__builtin_ia32_pshufhw:
case X86::BI__builtin_ia32_pshufhw256:
case X86::BI__builtin_ia32_pshufhw512:
case X86::BI__builtin_ia32_pshuflw:
case X86::BI__builtin_ia32_pshuflw256:
case X86::BI__builtin_ia32_pshuflw512:
case X86::BI__builtin_ia32_vcvtps2ph:
case X86::BI__builtin_ia32_vcvtps2ph_mask:
case X86::BI__builtin_ia32_vcvtps2ph256:
case X86::BI__builtin_ia32_vcvtps2ph256_mask:
case X86::BI__builtin_ia32_vcvtps2ph512_mask:
case X86::BI__builtin_ia32_rndscaleps_128_mask:
case X86::BI__builtin_ia32_rndscalepd_128_mask:
case X86::BI__builtin_ia32_rndscaleps_256_mask:
case X86::BI__builtin_ia32_rndscalepd_256_mask:
case X86::BI__builtin_ia32_rndscaleps_mask:
case X86::BI__builtin_ia32_rndscalepd_mask:
case X86::BI__builtin_ia32_reducepd128_mask:
case X86::BI__builtin_ia32_reducepd256_mask:
case X86::BI__builtin_ia32_reducepd512_mask:
case X86::BI__builtin_ia32_reduceps128_mask:
case X86::BI__builtin_ia32_reduceps256_mask:
case X86::BI__builtin_ia32_reduceps512_mask:
case X86::BI__builtin_ia32_prold512:
case X86::BI__builtin_ia32_prolq512:
case X86::BI__builtin_ia32_prold128:
case X86::BI__builtin_ia32_prold256:
case X86::BI__builtin_ia32_prolq128:
case X86::BI__builtin_ia32_prolq256:
case X86::BI__builtin_ia32_prord512:
case X86::BI__builtin_ia32_prorq512:
case X86::BI__builtin_ia32_prord128:
case X86::BI__builtin_ia32_prord256:
case X86::BI__builtin_ia32_prorq128:
case X86::BI__builtin_ia32_prorq256:
case X86::BI__builtin_ia32_fpclasspd128_mask:
case X86::BI__builtin_ia32_fpclasspd256_mask:
case X86::BI__builtin_ia32_fpclassps128_mask:
case X86::BI__builtin_ia32_fpclassps256_mask:
case X86::BI__builtin_ia32_fpclassps512_mask:
case X86::BI__builtin_ia32_fpclasspd512_mask:
case X86::BI__builtin_ia32_fpclasssd_mask:
case X86::BI__builtin_ia32_fpclassss_mask:
case X86::BI__builtin_ia32_pslldqi128_byteshift:
case X86::BI__builtin_ia32_pslldqi256_byteshift:
case X86::BI__builtin_ia32_pslldqi512_byteshift:
case X86::BI__builtin_ia32_psrldqi128_byteshift:
case X86::BI__builtin_ia32_psrldqi256_byteshift:
case X86::BI__builtin_ia32_psrldqi512_byteshift:
case X86::BI__builtin_ia32_kshiftliqi:
case X86::BI__builtin_ia32_kshiftlihi:
case X86::BI__builtin_ia32_kshiftlisi:
case X86::BI__builtin_ia32_kshiftlidi:
case X86::BI__builtin_ia32_kshiftriqi:
case X86::BI__builtin_ia32_kshiftrihi:
case X86::BI__builtin_ia32_kshiftrisi:
case X86::BI__builtin_ia32_kshiftridi:
i = 1; l = 0; u = 255;
break;
case X86::BI__builtin_ia32_vperm2f128_pd256:
case X86::BI__builtin_ia32_vperm2f128_ps256:
case X86::BI__builtin_ia32_vperm2f128_si256:
case X86::BI__builtin_ia32_permti256:
case X86::BI__builtin_ia32_pblendw128:
case X86::BI__builtin_ia32_pblendw256:
case X86::BI__builtin_ia32_blendps256:
case X86::BI__builtin_ia32_pblendd256:
case X86::BI__builtin_ia32_palignr128:
case X86::BI__builtin_ia32_palignr256:
case X86::BI__builtin_ia32_palignr512:
case X86::BI__builtin_ia32_alignq512:
case X86::BI__builtin_ia32_alignd512:
case X86::BI__builtin_ia32_alignd128:
case X86::BI__builtin_ia32_alignd256:
case X86::BI__builtin_ia32_alignq128:
case X86::BI__builtin_ia32_alignq256:
case X86::BI__builtin_ia32_vcomisd:
case X86::BI__builtin_ia32_vcomiss:
case X86::BI__builtin_ia32_shuf_f32x4:
case X86::BI__builtin_ia32_shuf_f64x2:
case X86::BI__builtin_ia32_shuf_i32x4:
case X86::BI__builtin_ia32_shuf_i64x2:
case X86::BI__builtin_ia32_shufpd512:
case X86::BI__builtin_ia32_shufps:
case X86::BI__builtin_ia32_shufps256:
case X86::BI__builtin_ia32_shufps512:
case X86::BI__builtin_ia32_dbpsadbw128:
case X86::BI__builtin_ia32_dbpsadbw256:
case X86::BI__builtin_ia32_dbpsadbw512:
case X86::BI__builtin_ia32_vpshldd128:
case X86::BI__builtin_ia32_vpshldd256:
case X86::BI__builtin_ia32_vpshldd512:
case X86::BI__builtin_ia32_vpshldq128:
case X86::BI__builtin_ia32_vpshldq256:
case X86::BI__builtin_ia32_vpshldq512:
case X86::BI__builtin_ia32_vpshldw128:
case X86::BI__builtin_ia32_vpshldw256:
case X86::BI__builtin_ia32_vpshldw512:
case X86::BI__builtin_ia32_vpshrdd128:
case X86::BI__builtin_ia32_vpshrdd256:
case X86::BI__builtin_ia32_vpshrdd512:
case X86::BI__builtin_ia32_vpshrdq128:
case X86::BI__builtin_ia32_vpshrdq256:
case X86::BI__builtin_ia32_vpshrdq512:
case X86::BI__builtin_ia32_vpshrdw128:
case X86::BI__builtin_ia32_vpshrdw256:
case X86::BI__builtin_ia32_vpshrdw512:
i = 2; l = 0; u = 255;
break;
case X86::BI__builtin_ia32_fixupimmpd512_mask:
case X86::BI__builtin_ia32_fixupimmpd512_maskz:
case X86::BI__builtin_ia32_fixupimmps512_mask:
case X86::BI__builtin_ia32_fixupimmps512_maskz:
case X86::BI__builtin_ia32_fixupimmsd_mask:
case X86::BI__builtin_ia32_fixupimmsd_maskz:
case X86::BI__builtin_ia32_fixupimmss_mask:
case X86::BI__builtin_ia32_fixupimmss_maskz:
case X86::BI__builtin_ia32_fixupimmpd128_mask:
case X86::BI__builtin_ia32_fixupimmpd128_maskz:
case X86::BI__builtin_ia32_fixupimmpd256_mask:
case X86::BI__builtin_ia32_fixupimmpd256_maskz:
case X86::BI__builtin_ia32_fixupimmps128_mask:
case X86::BI__builtin_ia32_fixupimmps128_maskz:
case X86::BI__builtin_ia32_fixupimmps256_mask:
case X86::BI__builtin_ia32_fixupimmps256_maskz:
case X86::BI__builtin_ia32_pternlogd512_mask:
case X86::BI__builtin_ia32_pternlogd512_maskz:
case X86::BI__builtin_ia32_pternlogq512_mask:
case X86::BI__builtin_ia32_pternlogq512_maskz:
case X86::BI__builtin_ia32_pternlogd128_mask:
case X86::BI__builtin_ia32_pternlogd128_maskz:
case X86::BI__builtin_ia32_pternlogd256_mask:
case X86::BI__builtin_ia32_pternlogd256_maskz:
case X86::BI__builtin_ia32_pternlogq128_mask:
case X86::BI__builtin_ia32_pternlogq128_maskz:
case X86::BI__builtin_ia32_pternlogq256_mask:
case X86::BI__builtin_ia32_pternlogq256_maskz:
i = 3; l = 0; u = 255;
break;
case X86::BI__builtin_ia32_gatherpfdpd:
case X86::BI__builtin_ia32_gatherpfdps:
case X86::BI__builtin_ia32_gatherpfqpd:
case X86::BI__builtin_ia32_gatherpfqps:
case X86::BI__builtin_ia32_scatterpfdpd:
case X86::BI__builtin_ia32_scatterpfdps:
case X86::BI__builtin_ia32_scatterpfqpd:
case X86::BI__builtin_ia32_scatterpfqps:
i = 4; l = 2; u = 3;
break;
case X86::BI__builtin_ia32_reducesd_mask:
case X86::BI__builtin_ia32_reducess_mask:
case X86::BI__builtin_ia32_rndscalesd_round_mask:
case X86::BI__builtin_ia32_rndscaless_round_mask:
i = 4; l = 0; u = 255;
break;
}
// Note that we don't force a hard error on the range check here, allowing
// template-generated or macro-generated dead code to potentially have out-of-
// range values. These need to code generate, but don't need to necessarily
// make any sense. We use a warning that defaults to an error.
return SemaBuiltinConstantArgRange(TheCall, i, l, u, /*RangeIsError*/ false);
}
/// Given a FunctionDecl's FormatAttr, attempts to populate the FomatStringInfo
/// parameter with the FormatAttr's correct format_idx and firstDataArg.
/// Returns true when the format fits the function and the FormatStringInfo has
/// been populated.
bool Sema::getFormatStringInfo(const FormatAttr *Format, bool IsCXXMember,
FormatStringInfo *FSI) {
FSI->HasVAListArg = Format->getFirstArg() == 0;
FSI->FormatIdx = Format->getFormatIdx() - 1;
FSI->FirstDataArg = FSI->HasVAListArg ? 0 : Format->getFirstArg() - 1;
// The way the format attribute works in GCC, the implicit this argument
// of member functions is counted. However, it doesn't appear in our own
// lists, so decrement format_idx in that case.
if (IsCXXMember) {
if(FSI->FormatIdx == 0)
return false;
--FSI->FormatIdx;
if (FSI->FirstDataArg != 0)
--FSI->FirstDataArg;
}
return true;
}
/// Checks if a the given expression evaluates to null.
///
/// Returns true if the value evaluates to null.
static bool CheckNonNullExpr(Sema &S, const Expr *Expr) {
// If the expression has non-null type, it doesn't evaluate to null.
if (auto nullability
= Expr->IgnoreImplicit()->getType()->getNullability(S.Context)) {
if (*nullability == NullabilityKind::NonNull)
return false;
}
// As a special case, transparent unions initialized with zero are
// considered null for the purposes of the nonnull attribute.
if (const RecordType *UT = Expr->getType()->getAsUnionType()) {
if (UT->getDecl()->hasAttr<TransparentUnionAttr>())
if (const CompoundLiteralExpr *CLE =
dyn_cast<CompoundLiteralExpr>(Expr))
if (const InitListExpr *ILE =
dyn_cast<InitListExpr>(CLE->getInitializer()))
Expr = ILE->getInit(0);
}
bool Result;
return (!Expr->isValueDependent() &&
Expr->EvaluateAsBooleanCondition(Result, S.Context) &&
!Result);
}
static void CheckNonNullArgument(Sema &S,
const Expr *ArgExpr,
SourceLocation CallSiteLoc) {
if (CheckNonNullExpr(S, ArgExpr))
S.DiagRuntimeBehavior(CallSiteLoc, ArgExpr,
S.PDiag(diag::warn_null_arg)
<< ArgExpr->getSourceRange());
}
bool Sema::GetFormatNSStringIdx(const FormatAttr *Format, unsigned &Idx) {
FormatStringInfo FSI;
if ((GetFormatStringType(Format) == FST_NSString) &&
getFormatStringInfo(Format, false, &FSI)) {
Idx = FSI.FormatIdx;
return true;
}
return false;
}
/// Diagnose use of %s directive in an NSString which is being passed
/// as formatting string to formatting method.
static void
DiagnoseCStringFormatDirectiveInCFAPI(Sema &S,
const NamedDecl *FDecl,
Expr **Args,
unsigned NumArgs) {
unsigned Idx = 0;
bool Format = false;
ObjCStringFormatFamily SFFamily = FDecl->getObjCFStringFormattingFamily();
if (SFFamily == ObjCStringFormatFamily::SFF_CFString) {
Idx = 2;
Format = true;
}
else
for (const auto *I : FDecl->specific_attrs<FormatAttr>()) {
if (S.GetFormatNSStringIdx(I, Idx)) {
Format = true;
break;
}
}
if (!Format || NumArgs <= Idx)
return;
const Expr *FormatExpr = Args[Idx];
if (const CStyleCastExpr *CSCE = dyn_cast<CStyleCastExpr>(FormatExpr))
FormatExpr = CSCE->getSubExpr();
const StringLiteral *FormatString;
if (const ObjCStringLiteral *OSL =
dyn_cast<ObjCStringLiteral>(FormatExpr->IgnoreParenImpCasts()))
FormatString = OSL->getString();
else
FormatString = dyn_cast<StringLiteral>(FormatExpr->IgnoreParenImpCasts());
if (!FormatString)
return;
if (S.FormatStringHasSArg(FormatString)) {
S.Diag(FormatExpr->getExprLoc(), diag::warn_objc_cdirective_format_string)
<< "%s" << 1 << 1;
S.Diag(FDecl->getLocation(), diag::note_entity_declared_at)
<< FDecl->getDeclName();
}
}
/// Determine whether the given type has a non-null nullability annotation.
static bool isNonNullType(ASTContext &ctx, QualType type) {
if (auto nullability = type->getNullability(ctx))
return *nullability == NullabilityKind::NonNull;
return false;
}
static void CheckNonNullArguments(Sema &S,
const NamedDecl *FDecl,
const FunctionProtoType *Proto,
ArrayRef<const Expr *> Args,
SourceLocation CallSiteLoc) {
assert((FDecl || Proto) && "Need a function declaration or prototype");
// Already checked by by constant evaluator.
if (S.isConstantEvaluated())
return;
// Check the attributes attached to the method/function itself.
llvm::SmallBitVector NonNullArgs;
if (FDecl) {
// Handle the nonnull attribute on the function/method declaration itself.
for (const auto *NonNull : FDecl->specific_attrs<NonNullAttr>()) {
if (!NonNull->args_size()) {
// Easy case: all pointer arguments are nonnull.
for (const auto *Arg : Args)
if (S.isValidPointerAttrType(Arg->getType()))
CheckNonNullArgument(S, Arg, CallSiteLoc);
return;
}
for (const ParamIdx &Idx : NonNull->args()) {
unsigned IdxAST = Idx.getASTIndex();
if (IdxAST >= Args.size())
continue;
if (NonNullArgs.empty())
NonNullArgs.resize(Args.size());
NonNullArgs.set(IdxAST);
}
}
}
if (FDecl && (isa<FunctionDecl>(FDecl) || isa<ObjCMethodDecl>(FDecl))) {
// Handle the nonnull attribute on the parameters of the
// function/method.
ArrayRef<ParmVarDecl*> parms;
if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(FDecl))
parms = FD->parameters();
else
parms = cast<ObjCMethodDecl>(FDecl)->parameters();
unsigned ParamIndex = 0;
for (ArrayRef<ParmVarDecl*>::iterator I = parms.begin(), E = parms.end();
I != E; ++I, ++ParamIndex) {
const ParmVarDecl *PVD = *I;
if (PVD->hasAttr<NonNullAttr>() ||
isNonNullType(S.Context, PVD->getType())) {
if (NonNullArgs.empty())
NonNullArgs.resize(Args.size());
NonNullArgs.set(ParamIndex);
}
}
} else {
// If we have a non-function, non-method declaration but no
// function prototype, try to dig out the function prototype.
if (!Proto) {
if (const ValueDecl *VD = dyn_cast<ValueDecl>(FDecl)) {
QualType type = VD->getType().getNonReferenceType();
if (auto pointerType = type->getAs<PointerType>())
type = pointerType->getPointeeType();
else if (auto blockType = type->getAs<BlockPointerType>())
type = blockType->getPointeeType();
// FIXME: data member pointers?
// Dig out the function prototype, if there is one.
Proto = type->getAs<FunctionProtoType>();
}
}
// Fill in non-null argument information from the nullability
// information on the parameter types (if we have them).
if (Proto) {
unsigned Index = 0;
for (auto paramType : Proto->getParamTypes()) {
if (isNonNullType(S.Context, paramType)) {
if (NonNullArgs.empty())
NonNullArgs.resize(Args.size());
NonNullArgs.set(Index);
}
++Index;
}
}
}
// Check for non-null arguments.
for (unsigned ArgIndex = 0, ArgIndexEnd = NonNullArgs.size();
ArgIndex != ArgIndexEnd; ++ArgIndex) {
if (NonNullArgs[ArgIndex])
CheckNonNullArgument(S, Args[ArgIndex], CallSiteLoc);
}
}
/// Handles the checks for format strings, non-POD arguments to vararg
/// functions, NULL arguments passed to non-NULL parameters, and diagnose_if
/// attributes.
void Sema::checkCall(NamedDecl *FDecl, const FunctionProtoType *Proto,
const Expr *ThisArg, ArrayRef<const Expr *> Args,
bool IsMemberFunction, SourceLocation Loc,
SourceRange Range, VariadicCallType CallType) {
// FIXME: We should check as much as we can in the template definition.
if (CurContext->isDependentContext())
return;
// Printf and scanf checking.
llvm::SmallBitVector CheckedVarArgs;
if (FDecl) {
for (const auto *I : FDecl->specific_attrs<FormatAttr>()) {
// Only create vector if there are format attributes.
CheckedVarArgs.resize(Args.size());
CheckFormatArguments(I, Args, IsMemberFunction, CallType, Loc, Range,
CheckedVarArgs);
}
}
// Refuse POD arguments that weren't caught by the format string
// checks above.
auto *FD = dyn_cast_or_null<FunctionDecl>(FDecl);
if (CallType != VariadicDoesNotApply &&
(!FD || FD->getBuiltinID() != Builtin::BI__noop)) {
unsigned NumParams = Proto ? Proto->getNumParams()
: FDecl && isa<FunctionDecl>(FDecl)
? cast<FunctionDecl>(FDecl)->getNumParams()
: FDecl && isa<ObjCMethodDecl>(FDecl)
? cast<ObjCMethodDecl>(FDecl)->param_size()
: 0;
for (unsigned ArgIdx = NumParams; ArgIdx < Args.size(); ++ArgIdx) {
// Args[ArgIdx] can be null in malformed code.
if (const Expr *Arg = Args[ArgIdx]) {
if (CheckedVarArgs.empty() || !CheckedVarArgs[ArgIdx])
checkVariadicArgument(Arg, CallType);
}
}
}
if (FDecl || Proto) {
CheckNonNullArguments(*this, FDecl, Proto, Args, Loc);
// Type safety checking.
if (FDecl) {
for (const auto *I : FDecl->specific_attrs<ArgumentWithTypeTagAttr>())
CheckArgumentWithTypeTag(I, Args, Loc);
}
}
if (FDecl && FDecl->hasAttr<AllocAlignAttr>()) {
auto *AA = FDecl->getAttr<AllocAlignAttr>();
const Expr *Arg = Args[AA->getParamIndex().getASTIndex()];
if (!Arg->isValueDependent()) {
Expr::EvalResult Align;
if (Arg->EvaluateAsInt(Align, Context)) {
const llvm::APSInt &I = Align.Val.getInt();
if (!I.isPowerOf2())
Diag(Arg->getExprLoc(), diag::warn_alignment_not_power_of_two)
<< Arg->getSourceRange();
if (I > Sema::MaximumAlignment)
Diag(Arg->getExprLoc(), diag::warn_assume_aligned_too_great)
<< Arg->getSourceRange() << Sema::MaximumAlignment;
}
}
}
if (FD)
diagnoseArgDependentDiagnoseIfAttrs(FD, ThisArg, Args, Loc);
}
/// CheckConstructorCall - Check a constructor call for correctness and safety
/// properties not enforced by the C type system.
void Sema::CheckConstructorCall(FunctionDecl *FDecl,
ArrayRef<const Expr *> Args,
const FunctionProtoType *Proto,
SourceLocation Loc) {
VariadicCallType CallType =
Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply;
checkCall(FDecl, Proto, /*ThisArg=*/nullptr, Args, /*IsMemberFunction=*/true,
Loc, SourceRange(), CallType);
}
/// CheckFunctionCall - Check a direct function call for various correctness
/// and safety properties not strictly enforced by the C type system.
bool Sema::CheckFunctionCall(FunctionDecl *FDecl, CallExpr *TheCall,
const FunctionProtoType *Proto) {
bool IsMemberOperatorCall = isa<CXXOperatorCallExpr>(TheCall) &&
isa<CXXMethodDecl>(FDecl);
bool IsMemberFunction = isa<CXXMemberCallExpr>(TheCall) ||
IsMemberOperatorCall;
VariadicCallType CallType = getVariadicCallType(FDecl, Proto,
TheCall->getCallee());
Expr** Args = TheCall->getArgs();
unsigned NumArgs = TheCall->getNumArgs();
Expr *ImplicitThis = nullptr;
if (IsMemberOperatorCall) {
// If this is a call to a member operator, hide the first argument
// from checkCall.
// FIXME: Our choice of AST representation here is less than ideal.
ImplicitThis = Args[0];
++Args;
--NumArgs;
} else if (IsMemberFunction)
ImplicitThis =
cast<CXXMemberCallExpr>(TheCall)->getImplicitObjectArgument();
checkCall(FDecl, Proto, ImplicitThis, llvm::makeArrayRef(Args, NumArgs),
IsMemberFunction, TheCall->getRParenLoc(),
TheCall->getCallee()->getSourceRange(), CallType);
IdentifierInfo *FnInfo = FDecl->getIdentifier();
// None of the checks below are needed for functions that don't have
// simple names (e.g., C++ conversion functions).
if (!FnInfo)
return false;
CheckAbsoluteValueFunction(TheCall, FDecl);
CheckMaxUnsignedZero(TheCall, FDecl);
if (getLangOpts().ObjC)
DiagnoseCStringFormatDirectiveInCFAPI(*this, FDecl, Args, NumArgs);
unsigned CMId = FDecl->getMemoryFunctionKind();
if (CMId == 0)
return false;
// Handle memory setting and copying functions.
if (CMId == Builtin::BIstrlcpy || CMId == Builtin::BIstrlcat)
CheckStrlcpycatArguments(TheCall, FnInfo);
else if (CMId == Builtin::BIstrncat)
CheckStrncatArguments(TheCall, FnInfo);
else
CheckMemaccessArguments(TheCall, CMId, FnInfo);
return false;
}
bool Sema::CheckObjCMethodCall(ObjCMethodDecl *Method, SourceLocation lbrac,
ArrayRef<const Expr *> Args) {
VariadicCallType CallType =
Method->isVariadic() ? VariadicMethod : VariadicDoesNotApply;
checkCall(Method, nullptr, /*ThisArg=*/nullptr, Args,
/*IsMemberFunction=*/false, lbrac, Method->getSourceRange(),
CallType);
return false;
}
bool Sema::CheckPointerCall(NamedDecl *NDecl, CallExpr *TheCall,
const FunctionProtoType *Proto) {
QualType Ty;
if (const auto *V = dyn_cast<VarDecl>(NDecl))
Ty = V->getType().getNonReferenceType();
else if (const auto *F = dyn_cast<FieldDecl>(NDecl))
Ty = F->getType().getNonReferenceType();
else
return false;
if (!Ty->isBlockPointerType() && !Ty->isFunctionPointerType() &&
!Ty->isFunctionProtoType())
return false;
VariadicCallType CallType;
if (!Proto || !Proto->isVariadic()) {
CallType = VariadicDoesNotApply;
} else if (Ty->isBlockPointerType()) {
CallType = VariadicBlock;
} else { // Ty->isFunctionPointerType()
CallType = VariadicFunction;
}
checkCall(NDecl, Proto, /*ThisArg=*/nullptr,
llvm::makeArrayRef(TheCall->getArgs(), TheCall->getNumArgs()),
/*IsMemberFunction=*/false, TheCall->getRParenLoc(),
TheCall->getCallee()->getSourceRange(), CallType);
return false;
}
/// Checks function calls when a FunctionDecl or a NamedDecl is not available,
/// such as function pointers returned from functions.
bool Sema::CheckOtherCall(CallExpr *TheCall, const FunctionProtoType *Proto) {
VariadicCallType CallType = getVariadicCallType(/*FDecl=*/nullptr, Proto,
TheCall->getCallee());
checkCall(/*FDecl=*/nullptr, Proto, /*ThisArg=*/nullptr,
llvm::makeArrayRef(TheCall->getArgs(), TheCall->getNumArgs()),
/*IsMemberFunction=*/false, TheCall->getRParenLoc(),
TheCall->getCallee()->getSourceRange(), CallType);
return false;
}
static bool isValidOrderingForOp(int64_t Ordering, AtomicExpr::AtomicOp Op) {
if (!llvm::isValidAtomicOrderingCABI(Ordering))
return false;
auto OrderingCABI = (llvm::AtomicOrderingCABI)Ordering;
switch (Op) {
case AtomicExpr::AO__c11_atomic_init:
case AtomicExpr::AO__opencl_atomic_init:
llvm_unreachable("There is no ordering argument for an init");
case AtomicExpr::AO__c11_atomic_load:
case AtomicExpr::AO__opencl_atomic_load:
case AtomicExpr::AO__atomic_load_n:
case AtomicExpr::AO__atomic_load:
return OrderingCABI != llvm::AtomicOrderingCABI::release &&
OrderingCABI != llvm::AtomicOrderingCABI::acq_rel;
case AtomicExpr::AO__c11_atomic_store:
case AtomicExpr::AO__opencl_atomic_store:
case AtomicExpr::AO__atomic_store:
case AtomicExpr::AO__atomic_store_n:
return OrderingCABI != llvm::AtomicOrderingCABI::consume &&
OrderingCABI != llvm::AtomicOrderingCABI::acquire &&
OrderingCABI != llvm::AtomicOrderingCABI::acq_rel;
default:
return true;
}
}
ExprResult Sema::SemaAtomicOpsOverloaded(ExprResult TheCallResult,
AtomicExpr::AtomicOp Op) {
CallExpr *TheCall = cast<CallExpr>(TheCallResult.get());
DeclRefExpr *DRE =cast<DeclRefExpr>(TheCall->getCallee()->IgnoreParenCasts());
MultiExprArg Args{TheCall->getArgs(), TheCall->getNumArgs()};
return BuildAtomicExpr({TheCall->getBeginLoc(), TheCall->getEndLoc()},
DRE->getSourceRange(), TheCall->getRParenLoc(), Args,
Op);
}
ExprResult Sema::BuildAtomicExpr(SourceRange CallRange, SourceRange ExprRange,
SourceLocation RParenLoc, MultiExprArg Args,
AtomicExpr::AtomicOp Op,
AtomicArgumentOrder ArgOrder) {
// All the non-OpenCL operations take one of the following forms.
// The OpenCL operations take the __c11 forms with one extra argument for
// synchronization scope.
enum {
// C __c11_atomic_init(A *, C)
Init,
// C __c11_atomic_load(A *, int)
Load,
// void __atomic_load(A *, CP, int)
LoadCopy,
// void __atomic_store(A *, CP, int)
Copy,
// C __c11_atomic_add(A *, M, int)
Arithmetic,
// C __atomic_exchange_n(A *, CP, int)
Xchg,
// void __atomic_exchange(A *, C *, CP, int)
GNUXchg,
// bool __c11_atomic_compare_exchange_strong(A *, C *, CP, int, int)
C11CmpXchg,
// bool __atomic_compare_exchange(A *, C *, CP, bool, int, int)
GNUCmpXchg
} Form = Init;
const unsigned NumForm = GNUCmpXchg + 1;
const unsigned NumArgs[] = { 2, 2, 3, 3, 3, 3, 4, 5, 6 };
const unsigned NumVals[] = { 1, 0, 1, 1, 1, 1, 2, 2, 3 };
// where:
// C is an appropriate type,
// A is volatile _Atomic(C) for __c11 builtins and is C for GNU builtins,
// CP is C for __c11 builtins and GNU _n builtins and is C * otherwise,
// M is C if C is an integer, and ptrdiff_t if C is a pointer, and
// the int parameters are for orderings.
static_assert(sizeof(NumArgs)/sizeof(NumArgs[0]) == NumForm
&& sizeof(NumVals)/sizeof(NumVals[0]) == NumForm,
"need to update code for modified forms");
static_assert(AtomicExpr::AO__c11_atomic_init == 0 &&
AtomicExpr::AO__c11_atomic_fetch_min + 1 ==
AtomicExpr::AO__atomic_load,
"need to update code for modified C11 atomics");
bool IsOpenCL = Op >= AtomicExpr::AO__opencl_atomic_init &&
Op <= AtomicExpr::AO__opencl_atomic_fetch_max;
bool IsC11 = (Op >= AtomicExpr::AO__c11_atomic_init &&
Op <= AtomicExpr::AO__c11_atomic_fetch_min) ||
IsOpenCL;
bool IsN = Op == AtomicExpr::AO__atomic_load_n ||
Op == AtomicExpr::AO__atomic_store_n ||
Op == AtomicExpr::AO__atomic_exchange_n ||
Op == AtomicExpr::AO__atomic_compare_exchange_n;
bool IsAddSub = false;
switch (Op) {
case AtomicExpr::AO__c11_atomic_init:
case AtomicExpr::AO__opencl_atomic_init:
Form = Init;
break;
case AtomicExpr::AO__c11_atomic_load:
case AtomicExpr::AO__opencl_atomic_load:
case AtomicExpr::AO__atomic_load_n:
Form = Load;
break;
case AtomicExpr::AO__atomic_load:
Form = LoadCopy;
break;
case AtomicExpr::AO__c11_atomic_store:
case AtomicExpr::AO__opencl_atomic_store:
case AtomicExpr::AO__atomic_store:
case AtomicExpr::AO__atomic_store_n:
Form = Copy;
break;
case AtomicExpr::AO__c11_atomic_fetch_add:
case AtomicExpr::AO__c11_atomic_fetch_sub:
case AtomicExpr::AO__opencl_atomic_fetch_add:
case AtomicExpr::AO__opencl_atomic_fetch_sub:
case AtomicExpr::AO__atomic_fetch_add:
case AtomicExpr::AO__atomic_fetch_sub:
case AtomicExpr::AO__atomic_add_fetch:
case AtomicExpr::AO__atomic_sub_fetch:
IsAddSub = true;
LLVM_FALLTHROUGH;
case AtomicExpr::AO__c11_atomic_fetch_and:
case AtomicExpr::AO__c11_atomic_fetch_or:
case AtomicExpr::AO__c11_atomic_fetch_xor:
case AtomicExpr::AO__opencl_atomic_fetch_and:
case AtomicExpr::AO__opencl_atomic_fetch_or:
case AtomicExpr::AO__opencl_atomic_fetch_xor:
case AtomicExpr::AO__atomic_fetch_and:
case AtomicExpr::AO__atomic_fetch_or:
case AtomicExpr::AO__atomic_fetch_xor:
case AtomicExpr::AO__atomic_fetch_nand:
case AtomicExpr::AO__atomic_and_fetch:
case AtomicExpr::AO__atomic_or_fetch:
case AtomicExpr::AO__atomic_xor_fetch:
case AtomicExpr::AO__atomic_nand_fetch:
case AtomicExpr::AO__c11_atomic_fetch_min:
case AtomicExpr::AO__c11_atomic_fetch_max:
case AtomicExpr::AO__opencl_atomic_fetch_min:
case AtomicExpr::AO__opencl_atomic_fetch_max:
case AtomicExpr::AO__atomic_min_fetch:
case AtomicExpr::AO__atomic_max_fetch:
case AtomicExpr::AO__atomic_fetch_min:
case AtomicExpr::AO__atomic_fetch_max:
Form = Arithmetic;
break;
case AtomicExpr::AO__c11_atomic_exchange:
case AtomicExpr::AO__opencl_atomic_exchange:
case AtomicExpr::AO__atomic_exchange_n:
Form = Xchg;
break;
case AtomicExpr::AO__atomic_exchange:
Form = GNUXchg;
break;
case AtomicExpr::AO__c11_atomic_compare_exchange_strong:
case AtomicExpr::AO__c11_atomic_compare_exchange_weak:
case AtomicExpr::AO__opencl_atomic_compare_exchange_strong:
case AtomicExpr::AO__opencl_atomic_compare_exchange_weak:
Form = C11CmpXchg;
break;
case AtomicExpr::AO__atomic_compare_exchange:
case AtomicExpr::AO__atomic_compare_exchange_n:
Form = GNUCmpXchg;
break;
}
unsigned AdjustedNumArgs = NumArgs[Form];
if (IsOpenCL && Op != AtomicExpr::AO__opencl_atomic_init)
++AdjustedNumArgs;
// Check we have the right number of arguments.
if (Args.size() < AdjustedNumArgs) {
Diag(CallRange.getEnd(), diag::err_typecheck_call_too_few_args)
<< 0 << AdjustedNumArgs << static_cast<unsigned>(Args.size())
<< ExprRange;
return ExprError();
} else if (Args.size() > AdjustedNumArgs) {
Diag(Args[AdjustedNumArgs]->getBeginLoc(),
diag::err_typecheck_call_too_many_args)
<< 0 << AdjustedNumArgs << static_cast<unsigned>(Args.size())
<< ExprRange;
return ExprError();
}
// Inspect the first argument of the atomic operation.
Expr *Ptr = Args[0];
ExprResult ConvertedPtr = DefaultFunctionArrayLvalueConversion(Ptr);
if (ConvertedPtr.isInvalid())
return ExprError();
Ptr = ConvertedPtr.get();
const PointerType *pointerType = Ptr->getType()->getAs<PointerType>();
if (!pointerType) {
Diag(ExprRange.getBegin(), diag::err_atomic_builtin_must_be_pointer)
<< Ptr->getType() << Ptr->getSourceRange();
return ExprError();
}
// For a __c11 builtin, this should be a pointer to an _Atomic type.
QualType AtomTy = pointerType->getPointeeType(); // 'A'
QualType ValType = AtomTy; // 'C'
if (IsC11) {
if (!AtomTy->isAtomicType()) {
Diag(ExprRange.getBegin(), diag::err_atomic_op_needs_atomic)
<< Ptr->getType() << Ptr->getSourceRange();
return ExprError();
}
if ((Form != Load && Form != LoadCopy && AtomTy.isConstQualified()) ||
AtomTy.getAddressSpace() == LangAS::opencl_constant) {
Diag(ExprRange.getBegin(), diag::err_atomic_op_needs_non_const_atomic)
<< (AtomTy.isConstQualified() ? 0 : 1) << Ptr->getType()
<< Ptr->getSourceRange();
return ExprError();
}
ValType = AtomTy->castAs<AtomicType>()->getValueType();
} else if (Form != Load && Form != LoadCopy) {
if (ValType.isConstQualified()) {
Diag(ExprRange.getBegin(), diag::err_atomic_op_needs_non_const_pointer)
<< Ptr->getType() << Ptr->getSourceRange();
return ExprError();
}
}
// For an arithmetic operation, the implied arithmetic must be well-formed.
if (Form == Arithmetic) {
// gcc does not enforce these rules for GNU atomics, but we do so for sanity.
if (IsAddSub && !ValType->isIntegerType()
&& !ValType->isPointerType()) {
Diag(ExprRange.getBegin(), diag::err_atomic_op_needs_atomic_int_or_ptr)
<< IsC11 << Ptr->getType() << Ptr->getSourceRange();
return ExprError();
}
if (!IsAddSub && !ValType->isIntegerType()) {
Diag(ExprRange.getBegin(), diag::err_atomic_op_needs_atomic_int)
<< IsC11 << Ptr->getType() << Ptr->getSourceRange();
return ExprError();
}
if (IsC11 && ValType->isPointerType() &&
RequireCompleteType(Ptr->getBeginLoc(), ValType->getPointeeType(),
diag::err_incomplete_type)) {
return ExprError();
}
} else if (IsN && !ValType->isIntegerType() && !ValType->isPointerType()) {
// For __atomic_*_n operations, the value type must be a scalar integral or
// pointer type which is 1, 2, 4, 8 or 16 bytes in length.
Diag(ExprRange.getBegin(), diag::err_atomic_op_needs_atomic_int_or_ptr)
<< IsC11 << Ptr->getType() << Ptr->getSourceRange();
return ExprError();
}
if (!IsC11 && !AtomTy.isTriviallyCopyableType(Context) &&
!AtomTy->isScalarType()) {
// For GNU atomics, require a trivially-copyable type. This is not part of
// the GNU atomics specification, but we enforce it for sanity.
Diag(ExprRange.getBegin(), diag::err_atomic_op_needs_trivial_copy)
<< Ptr->getType() << Ptr->getSourceRange();
return ExprError();
}
switch (ValType.getObjCLifetime()) {
case Qualifiers::OCL_None:
case Qualifiers::OCL_ExplicitNone:
// okay
break;
case Qualifiers::OCL_Weak:
case Qualifiers::OCL_Strong:
case Qualifiers::OCL_Autoreleasing:
// FIXME: Can this happen? By this point, ValType should be known
// to be trivially copyable.
Diag(ExprRange.getBegin(), diag::err_arc_atomic_ownership)
<< ValType << Ptr->getSourceRange();
return ExprError();
}
// All atomic operations have an overload which takes a pointer to a volatile
// 'A'. We shouldn't let the volatile-ness of the pointee-type inject itself
// into the result or the other operands. Similarly atomic_load takes a
// pointer to a const 'A'.
ValType.removeLocalVolatile();
ValType.removeLocalConst();
QualType ResultType = ValType;
if (Form == Copy || Form == LoadCopy || Form == GNUXchg ||
Form == Init)
ResultType = Context.VoidTy;
else if (Form == C11CmpXchg || Form == GNUCmpXchg)
ResultType = Context.BoolTy;
// The type of a parameter passed 'by value'. In the GNU atomics, such
// arguments are actually passed as pointers.
QualType ByValType = ValType; // 'CP'
bool IsPassedByAddress = false;
if (!IsC11 && !IsN) {
ByValType = Ptr->getType();
IsPassedByAddress = true;
}
SmallVector<Expr *, 5> APIOrderedArgs;
if (ArgOrder == Sema::AtomicArgumentOrder::AST) {
APIOrderedArgs.push_back(Args[0]);
switch (Form) {
case Init:
case Load:
APIOrderedArgs.push_back(Args[1]); // Val1/Order
break;
case LoadCopy:
case Copy:
case Arithmetic:
case Xchg:
APIOrderedArgs.push_back(Args[2]); // Val1
APIOrderedArgs.push_back(Args[1]); // Order
break;
case GNUXchg:
APIOrderedArgs.push_back(Args[2]); // Val1
APIOrderedArgs.push_back(Args[3]); // Val2
APIOrderedArgs.push_back(Args[1]); // Order
break;
case C11CmpXchg:
APIOrderedArgs.push_back(Args[2]); // Val1
APIOrderedArgs.push_back(Args[4]); // Val2
APIOrderedArgs.push_back(Args[1]); // Order
APIOrderedArgs.push_back(Args[3]); // OrderFail
break;
case GNUCmpXchg:
APIOrderedArgs.push_back(Args[2]); // Val1
APIOrderedArgs.push_back(Args[4]); // Val2
APIOrderedArgs.push_back(Args[5]); // Weak
APIOrderedArgs.push_back(Args[1]); // Order
APIOrderedArgs.push_back(Args[3]); // OrderFail
break;
}
} else
APIOrderedArgs.append(Args.begin(), Args.end());
// The first argument's non-CV pointer type is used to deduce the type of
// subsequent arguments, except for:
// - weak flag (always converted to bool)
// - memory order (always converted to int)
// - scope (always converted to int)
for (unsigned i = 0; i != APIOrderedArgs.size(); ++i) {
QualType Ty;
if (i < NumVals[Form] + 1) {
switch (i) {
case 0:
// The first argument is always a pointer. It has a fixed type.
// It is always dereferenced, a nullptr is undefined.
CheckNonNullArgument(*this, APIOrderedArgs[i], ExprRange.getBegin());
// Nothing else to do: we already know all we want about this pointer.
continue;
case 1:
// The second argument is the non-atomic operand. For arithmetic, this
// is always passed by value, and for a compare_exchange it is always
// passed by address. For the rest, GNU uses by-address and C11 uses
// by-value.
assert(Form != Load);
if (Form == Init || (Form == Arithmetic && ValType->isIntegerType()))
Ty = ValType;
else if (Form == Copy || Form == Xchg) {
if (IsPassedByAddress) {
// The value pointer is always dereferenced, a nullptr is undefined.
CheckNonNullArgument(*this, APIOrderedArgs[i],
ExprRange.getBegin());
}
Ty = ByValType;
} else if (Form == Arithmetic)
Ty = Context.getPointerDiffType();
else {
Expr *ValArg = APIOrderedArgs[i];
// The value pointer is always dereferenced, a nullptr is undefined.
CheckNonNullArgument(*this, ValArg, ExprRange.getBegin());
LangAS AS = LangAS::Default;
// Keep address space of non-atomic pointer type.
if (const PointerType *PtrTy =
ValArg->getType()->getAs<PointerType>()) {
AS = PtrTy->getPointeeType().getAddressSpace();
}
Ty = Context.getPointerType(
Context.getAddrSpaceQualType(ValType.getUnqualifiedType(), AS));
}
break;
case 2:
// The third argument to compare_exchange / GNU exchange is the desired
// value, either by-value (for the C11 and *_n variant) or as a pointer.
if (IsPassedByAddress)
CheckNonNullArgument(*this, APIOrderedArgs[i], ExprRange.getBegin());
Ty = ByValType;
break;
case 3:
// The fourth argument to GNU compare_exchange is a 'weak' flag.
Ty = Context.BoolTy;
break;
}
} else {
// The order(s) and scope are always converted to int.
Ty = Context.IntTy;
}
InitializedEntity Entity =
InitializedEntity::InitializeParameter(Context, Ty, false);
ExprResult Arg = APIOrderedArgs[i];
Arg = PerformCopyInitialization(Entity, SourceLocation(), Arg);
if (Arg.isInvalid())
return true;
APIOrderedArgs[i] = Arg.get();
}
// Permute the arguments into a 'consistent' order.
SmallVector<Expr*, 5> SubExprs;
SubExprs.push_back(Ptr);
switch (Form) {
case Init:
// Note, AtomicExpr::getVal1() has a special case for this atomic.
SubExprs.push_back(APIOrderedArgs[1]); // Val1
break;
case Load:
SubExprs.push_back(APIOrderedArgs[1]); // Order
break;
case LoadCopy:
case Copy:
case Arithmetic:
case Xchg:
SubExprs.push_back(APIOrderedArgs[2]); // Order
SubExprs.push_back(APIOrderedArgs[1]); // Val1
break;
case GNUXchg:
// Note, AtomicExpr::getVal2() has a special case for this atomic.
SubExprs.push_back(APIOrderedArgs[3]); // Order
SubExprs.push_back(APIOrderedArgs[1]); // Val1
SubExprs.push_back(APIOrderedArgs[2]); // Val2
break;
case C11CmpXchg:
SubExprs.push_back(APIOrderedArgs[3]); // Order
SubExprs.push_back(APIOrderedArgs[1]); // Val1
SubExprs.push_back(APIOrderedArgs[4]); // OrderFail
SubExprs.push_back(APIOrderedArgs[2]); // Val2
break;
case GNUCmpXchg:
SubExprs.push_back(APIOrderedArgs[4]); // Order
SubExprs.push_back(APIOrderedArgs[1]); // Val1
SubExprs.push_back(APIOrderedArgs[5]); // OrderFail
SubExprs.push_back(APIOrderedArgs[2]); // Val2
SubExprs.push_back(APIOrderedArgs[3]); // Weak
break;
}
if (SubExprs.size() >= 2 && Form != Init) {
if (Optional<llvm::APSInt> Result =
SubExprs[1]->getIntegerConstantExpr(Context))
if (!isValidOrderingForOp(Result->getSExtValue(), Op))
Diag(SubExprs[1]->getBeginLoc(),
diag::warn_atomic_op_has_invalid_memory_order)
<< SubExprs[1]->getSourceRange();
}
if (auto ScopeModel = AtomicExpr::getScopeModel(Op)) {
auto *Scope = Args[Args.size() - 1];
if (Optional<llvm::APSInt> Result =
Scope->getIntegerConstantExpr(Context)) {
if (!ScopeModel->isValid(Result->getZExtValue()))
Diag(Scope->getBeginLoc(), diag::err_atomic_op_has_invalid_synch_scope)
<< Scope->getSourceRange();
}
SubExprs.push_back(Scope);
}
AtomicExpr *AE = new (Context)
AtomicExpr(ExprRange.getBegin(), SubExprs, ResultType, Op, RParenLoc);
if ((Op == AtomicExpr::AO__c11_atomic_load ||
Op == AtomicExpr::AO__c11_atomic_store ||
Op == AtomicExpr::AO__opencl_atomic_load ||
Op == AtomicExpr::AO__opencl_atomic_store ) &&
Context.AtomicUsesUnsupportedLibcall(AE))
Diag(AE->getBeginLoc(), diag::err_atomic_load_store_uses_lib)
<< ((Op == AtomicExpr::AO__c11_atomic_load ||
Op == AtomicExpr::AO__opencl_atomic_load)
? 0
: 1);
if (ValType->isExtIntType()) {
Diag(Ptr->getExprLoc(), diag::err_atomic_builtin_ext_int_prohibit);
return ExprError();
}
return AE;
}
/// checkBuiltinArgument - Given a call to a builtin function, perform
/// normal type-checking on the given argument, updating the call in
/// place. This is useful when a builtin function requires custom
/// type-checking for some of its arguments but not necessarily all of
/// them.
///
/// Returns true on error.
static bool checkBuiltinArgument(Sema &S, CallExpr *E, unsigned ArgIndex) {
FunctionDecl *Fn = E->getDirectCallee();
assert(Fn && "builtin call without direct callee!");
ParmVarDecl *Param = Fn->getParamDecl(ArgIndex);
InitializedEntity Entity =
InitializedEntity::InitializeParameter(S.Context, Param);
ExprResult Arg = E->getArg(0);
Arg = S.PerformCopyInitialization(Entity, SourceLocation(), Arg);
if (Arg.isInvalid())
return true;
E->setArg(ArgIndex, Arg.get());
return false;
}
/// We have a call to a function like __sync_fetch_and_add, which is an
/// overloaded function based on the pointer type of its first argument.
/// The main BuildCallExpr routines have already promoted the types of
/// arguments because all of these calls are prototyped as void(...).
///
/// This function goes through and does final semantic checking for these
/// builtins, as well as generating any warnings.
ExprResult
Sema::SemaBuiltinAtomicOverloaded(ExprResult TheCallResult) {
CallExpr *TheCall = static_cast<CallExpr *>(TheCallResult.get());
Expr *Callee = TheCall->getCallee();
DeclRefExpr *DRE = cast<DeclRefExpr>(Callee->IgnoreParenCasts());
FunctionDecl *FDecl = cast<FunctionDecl>(DRE->getDecl());
// Ensure that we have at least one argument to do type inference from.
if (TheCall->getNumArgs() < 1) {
Diag(TheCall->getEndLoc(), diag::err_typecheck_call_too_few_args_at_least)
<< 0 << 1 << TheCall->getNumArgs() << Callee->getSourceRange();
return ExprError();
}
// Inspect the first argument of the atomic builtin. This should always be
// a pointer type, whose element is an integral scalar or pointer type.
// Because it is a pointer type, we don't have to worry about any implicit
// casts here.
// FIXME: We don't allow floating point scalars as input.
Expr *FirstArg = TheCall->getArg(0);
ExprResult FirstArgResult = DefaultFunctionArrayLvalueConversion(FirstArg);
if (FirstArgResult.isInvalid())
return ExprError();
FirstArg = FirstArgResult.get();
TheCall->setArg(0, FirstArg);
const PointerType *pointerType = FirstArg->getType()->getAs<PointerType>();
if (!pointerType) {
Diag(DRE->getBeginLoc(), diag::err_atomic_builtin_must_be_pointer)
<< FirstArg->getType() << FirstArg->getSourceRange();
return ExprError();
}
QualType ValType = pointerType->getPointeeType();
if (!ValType->isIntegerType() && !ValType->isAnyPointerType() &&
!ValType->isBlockPointerType()) {
Diag(DRE->getBeginLoc(), diag::err_atomic_builtin_must_be_pointer_intptr)
<< FirstArg->getType() << FirstArg->getSourceRange();
return ExprError();
}
if (ValType.isConstQualified()) {
Diag(DRE->getBeginLoc(), diag::err_atomic_builtin_cannot_be_const)
<< FirstArg->getType() << FirstArg->getSourceRange();
return ExprError();
}
switch (ValType.getObjCLifetime()) {
case Qualifiers::OCL_None:
case Qualifiers::OCL_ExplicitNone:
// okay
break;
case Qualifiers::OCL_Weak:
case Qualifiers::OCL_Strong:
case Qualifiers::OCL_Autoreleasing:
Diag(DRE->getBeginLoc(), diag::err_arc_atomic_ownership)
<< ValType << FirstArg->getSourceRange();
return ExprError();
}
// Strip any qualifiers off ValType.
ValType = ValType.getUnqualifiedType();
// The majority of builtins return a value, but a few have special return
// types, so allow them to override appropriately below.
QualType ResultType = ValType;
// We need to figure out which concrete builtin this maps onto. For example,
// __sync_fetch_and_add with a 2 byte object turns into
// __sync_fetch_and_add_2.
#define BUILTIN_ROW(x) \
{ Builtin::BI##x##_1, Builtin::BI##x##_2, Builtin::BI##x##_4, \
Builtin::BI##x##_8, Builtin::BI##x##_16 }
static const unsigned BuiltinIndices[][5] = {
BUILTIN_ROW(__sync_fetch_and_add),
BUILTIN_ROW(__sync_fetch_and_sub),
BUILTIN_ROW(__sync_fetch_and_or),
BUILTIN_ROW(__sync_fetch_and_and),
BUILTIN_ROW(__sync_fetch_and_xor),
BUILTIN_ROW(__sync_fetch_and_nand),
BUILTIN_ROW(__sync_add_and_fetch),
BUILTIN_ROW(__sync_sub_and_fetch),
BUILTIN_ROW(__sync_and_and_fetch),
BUILTIN_ROW(__sync_or_and_fetch),
BUILTIN_ROW(__sync_xor_and_fetch),
BUILTIN_ROW(__sync_nand_and_fetch),
BUILTIN_ROW(__sync_val_compare_and_swap),
BUILTIN_ROW(__sync_bool_compare_and_swap),
BUILTIN_ROW(__sync_lock_test_and_set),
BUILTIN_ROW(__sync_lock_release),
BUILTIN_ROW(__sync_swap)
};
#undef BUILTIN_ROW
// Determine the index of the size.
unsigned SizeIndex;
switch (Context.getTypeSizeInChars(ValType).getQuantity()) {
case 1: SizeIndex = 0; break;
case 2: SizeIndex = 1; break;
case 4: SizeIndex = 2; break;
case 8: SizeIndex = 3; break;
case 16: SizeIndex = 4; break;
default:
Diag(DRE->getBeginLoc(), diag::err_atomic_builtin_pointer_size)
<< FirstArg->getType() << FirstArg->getSourceRange();
return ExprError();
}
// Each of these builtins has one pointer argument, followed by some number of
// values (0, 1 or 2) followed by a potentially empty varags list of stuff
// that we ignore. Find out which row of BuiltinIndices to read from as well
// as the number of fixed args.
unsigned BuiltinID = FDecl->getBuiltinID();
unsigned BuiltinIndex, NumFixed = 1;
bool WarnAboutSemanticsChange = false;
switch (BuiltinID) {
default: llvm_unreachable("Unknown overloaded atomic builtin!");
case Builtin::BI__sync_fetch_and_add:
case Builtin::BI__sync_fetch_and_add_1:
case Builtin::BI__sync_fetch_and_add_2:
case Builtin::BI__sync_fetch_and_add_4:
case Builtin::BI__sync_fetch_and_add_8:
case Builtin::BI__sync_fetch_and_add_16:
BuiltinIndex = 0;
break;
case Builtin::BI__sync_fetch_and_sub:
case Builtin::BI__sync_fetch_and_sub_1:
case Builtin::BI__sync_fetch_and_sub_2:
case Builtin::BI__sync_fetch_and_sub_4:
case Builtin::BI__sync_fetch_and_sub_8:
case Builtin::BI__sync_fetch_and_sub_16:
BuiltinIndex = 1;
break;
case Builtin::BI__sync_fetch_and_or:
case Builtin::BI__sync_fetch_and_or_1:
case Builtin::BI__sync_fetch_and_or_2:
case Builtin::BI__sync_fetch_and_or_4:
case Builtin::BI__sync_fetch_and_or_8:
case Builtin::BI__sync_fetch_and_or_16:
BuiltinIndex = 2;
break;
case Builtin::BI__sync_fetch_and_and:
case Builtin::BI__sync_fetch_and_and_1:
case Builtin::BI__sync_fetch_and_and_2:
case Builtin::BI__sync_fetch_and_and_4:
case Builtin::BI__sync_fetch_and_and_8:
case Builtin::BI__sync_fetch_and_and_16:
BuiltinIndex = 3;
break;
case Builtin::BI__sync_fetch_and_xor:
case Builtin::BI__sync_fetch_and_xor_1:
case Builtin::BI__sync_fetch_and_xor_2:
case Builtin::BI__sync_fetch_and_xor_4:
case Builtin::BI__sync_fetch_and_xor_8:
case Builtin::BI__sync_fetch_and_xor_16:
BuiltinIndex = 4;
break;
case Builtin::BI__sync_fetch_and_nand:
case Builtin::BI__sync_fetch_and_nand_1:
case Builtin::BI__sync_fetch_and_nand_2:
case Builtin::BI__sync_fetch_and_nand_4:
case Builtin::BI__sync_fetch_and_nand_8:
case Builtin::BI__sync_fetch_and_nand_16:
BuiltinIndex = 5;
WarnAboutSemanticsChange = true;
break;
case Builtin::BI__sync_add_and_fetch:
case Builtin::BI__sync_add_and_fetch_1:
case Builtin::BI__sync_add_and_fetch_2:
case Builtin::BI__sync_add_and_fetch_4:
case Builtin::BI__sync_add_and_fetch_8:
case Builtin::BI__sync_add_and_fetch_16:
BuiltinIndex = 6;
break;
case Builtin::BI__sync_sub_and_fetch:
case Builtin::BI__sync_sub_and_fetch_1:
case Builtin::BI__sync_sub_and_fetch_2:
case Builtin::BI__sync_sub_and_fetch_4:
case Builtin::BI__sync_sub_and_fetch_8:
case Builtin::BI__sync_sub_and_fetch_16:
BuiltinIndex = 7;
break;
case Builtin::BI__sync_and_and_fetch:
case Builtin::BI__sync_and_and_fetch_1:
case Builtin::BI__sync_and_and_fetch_2:
case Builtin::BI__sync_and_and_fetch_4:
case Builtin::BI__sync_and_and_fetch_8:
case Builtin::BI__sync_and_and_fetch_16:
BuiltinIndex = 8;
break;
case Builtin::BI__sync_or_and_fetch:
case Builtin::BI__sync_or_and_fetch_1:
case Builtin::BI__sync_or_and_fetch_2:
case Builtin::BI__sync_or_and_fetch_4:
case Builtin::BI__sync_or_and_fetch_8:
case Builtin::BI__sync_or_and_fetch_16:
BuiltinIndex = 9;
break;
case Builtin::BI__sync_xor_and_fetch:
case Builtin::BI__sync_xor_and_fetch_1:
case Builtin::BI__sync_xor_and_fetch_2:
case Builtin::BI__sync_xor_and_fetch_4:
case Builtin::BI__sync_xor_and_fetch_8:
case Builtin::BI__sync_xor_and_fetch_16:
BuiltinIndex = 10;
break;
case Builtin::BI__sync_nand_and_fetch:
case Builtin::BI__sync_nand_and_fetch_1:
case Builtin::BI__sync_nand_and_fetch_2:
case Builtin::BI__sync_nand_and_fetch_4:
case Builtin::BI__sync_nand_and_fetch_8:
case Builtin::BI__sync_nand_and_fetch_16:
BuiltinIndex = 11;
WarnAboutSemanticsChange = true;
break;
case Builtin::BI__sync_val_compare_and_swap:
case Builtin::BI__sync_val_compare_and_swap_1:
case Builtin::BI__sync_val_compare_and_swap_2:
case Builtin::BI__sync_val_compare_and_swap_4:
case Builtin::BI__sync_val_compare_and_swap_8:
case Builtin::BI__sync_val_compare_and_swap_16:
BuiltinIndex = 12;
NumFixed = 2;
break;
case Builtin::BI__sync_bool_compare_and_swap:
case Builtin::BI__sync_bool_compare_and_swap_1:
case Builtin::BI__sync_bool_compare_and_swap_2:
case Builtin::BI__sync_bool_compare_and_swap_4:
case Builtin::BI__sync_bool_compare_and_swap_8:
case Builtin::BI__sync_bool_compare_and_swap_16:
BuiltinIndex = 13;
NumFixed = 2;
ResultType = Context.BoolTy;
break;
case Builtin::BI__sync_lock_test_and_set:
case Builtin::BI__sync_lock_test_and_set_1:
case Builtin::BI__sync_lock_test_and_set_2:
case Builtin::BI__sync_lock_test_and_set_4:
case Builtin::BI__sync_lock_test_and_set_8:
case Builtin::BI__sync_lock_test_and_set_16:
BuiltinIndex = 14;
break;
case Builtin::BI__sync_lock_release:
case Builtin::BI__sync_lock_release_1:
case Builtin::BI__sync_lock_release_2:
case Builtin::BI__sync_lock_release_4:
case Builtin::BI__sync_lock_release_8:
case Builtin::BI__sync_lock_release_16:
BuiltinIndex = 15;
NumFixed = 0;
ResultType = Context.VoidTy;
break;
case Builtin::BI__sync_swap:
case Builtin::BI__sync_swap_1:
case Builtin::BI__sync_swap_2:
case Builtin::BI__sync_swap_4:
case Builtin::BI__sync_swap_8:
case Builtin::BI__sync_swap_16:
BuiltinIndex = 16;
break;
}
// Now that we know how many fixed arguments we expect, first check that we
// have at least that many.
if (TheCall->getNumArgs() < 1+NumFixed) {
Diag(TheCall->getEndLoc(), diag::err_typecheck_call_too_few_args_at_least)
<< 0 << 1 + NumFixed << TheCall->getNumArgs()
<< Callee->getSourceRange();
return ExprError();
}
Diag(TheCall->getEndLoc(), diag::warn_atomic_implicit_seq_cst)
<< Callee->getSourceRange();
if (WarnAboutSemanticsChange) {
Diag(TheCall->getEndLoc(), diag::warn_sync_fetch_and_nand_semantics_change)
<< Callee->getSourceRange();
}
// Get the decl for the concrete builtin from this, we can tell what the
// concrete integer type we should convert to is.
unsigned NewBuiltinID = BuiltinIndices[BuiltinIndex][SizeIndex];
const char *NewBuiltinName = Context.BuiltinInfo.getName(NewBuiltinID);
FunctionDecl *NewBuiltinDecl;
if (NewBuiltinID == BuiltinID)
NewBuiltinDecl = FDecl;
else {
// Perform builtin lookup to avoid redeclaring it.
DeclarationName DN(&Context.Idents.get(NewBuiltinName));
LookupResult Res(*this, DN, DRE->getBeginLoc(), LookupOrdinaryName);
LookupName(Res, TUScope, /*AllowBuiltinCreation=*/true);
assert(Res.getFoundDecl());
NewBuiltinDecl = dyn_cast<FunctionDecl>(Res.getFoundDecl());
if (!NewBuiltinDecl)
return ExprError();
}
// The first argument --- the pointer --- has a fixed type; we
// deduce the types of the rest of the arguments accordingly. Walk
// the remaining arguments, converting them to the deduced value type.
for (unsigned i = 0; i != NumFixed; ++i) {
ExprResult Arg = TheCall->getArg(i+1);
// GCC does an implicit conversion to the pointer or integer ValType. This
// can fail in some cases (1i -> int**), check for this error case now.
// Initialize the argument.
InitializedEntity Entity = InitializedEntity::InitializeParameter(Context,
ValType, /*consume*/ false);
Arg = PerformCopyInitialization(Entity, SourceLocation(), Arg);
if (Arg.isInvalid())
return ExprError();
// Okay, we have something that *can* be converted to the right type. Check
// to see if there is a potentially weird extension going on here. This can
// happen when you do an atomic operation on something like an char* and
// pass in 42. The 42 gets converted to char. This is even more strange
// for things like 45.123 -> char, etc.
// FIXME: Do this check.
TheCall->setArg(i+1, Arg.get());
}
// Create a new DeclRefExpr to refer to the new decl.
DeclRefExpr *NewDRE = DeclRefExpr::Create(
Context, DRE->getQualifierLoc(), SourceLocation(), NewBuiltinDecl,
/*enclosing*/ false, DRE->getLocation(), Context.BuiltinFnTy,
DRE->getValueKind(), nullptr, nullptr, DRE->isNonOdrUse());
// Set the callee in the CallExpr.
// FIXME: This loses syntactic information.
QualType CalleePtrTy = Context.getPointerType(NewBuiltinDecl->getType());
ExprResult PromotedCall = ImpCastExprToType(NewDRE, CalleePtrTy,
CK_BuiltinFnToFnPtr);
TheCall->setCallee(PromotedCall.get());
// Change the result type of the call to match the original value type. This
// is arbitrary, but the codegen for these builtins ins design to handle it
// gracefully.
TheCall->setType(ResultType);
// Prohibit use of _ExtInt with atomic builtins.
// The arguments would have already been converted to the first argument's
// type, so only need to check the first argument.
const auto *ExtIntValType = ValType->getAs<ExtIntType>();
if (ExtIntValType && !llvm::isPowerOf2_64(ExtIntValType->getNumBits())) {
Diag(FirstArg->getExprLoc(), diag::err_atomic_builtin_ext_int_size);
return ExprError();
}
return TheCallResult;
}
/// SemaBuiltinNontemporalOverloaded - We have a call to
/// __builtin_nontemporal_store or __builtin_nontemporal_load, which is an
/// overloaded function based on the pointer type of its last argument.
///
/// This function goes through and does final semantic checking for these
/// builtins.
ExprResult Sema::SemaBuiltinNontemporalOverloaded(ExprResult TheCallResult) {
CallExpr *TheCall = (CallExpr *)TheCallResult.get();
DeclRefExpr *DRE =
cast<DeclRefExpr>(TheCall->getCallee()->IgnoreParenCasts());
FunctionDecl *FDecl = cast<FunctionDecl>(DRE->getDecl());
unsigned BuiltinID = FDecl->getBuiltinID();
assert((BuiltinID == Builtin::BI__builtin_nontemporal_store ||
BuiltinID == Builtin::BI__builtin_nontemporal_load) &&
"Unexpected nontemporal load/store builtin!");
bool isStore = BuiltinID == Builtin::BI__builtin_nontemporal_store;
unsigned numArgs = isStore ? 2 : 1;
// Ensure that we have the proper number of arguments.
if (checkArgCount(*this, TheCall, numArgs))
return ExprError();
// Inspect the last argument of the nontemporal builtin. This should always
// be a pointer type, from which we imply the type of the memory access.
// Because it is a pointer type, we don't have to worry about any implicit
// casts here.
Expr *PointerArg = TheCall->getArg(numArgs - 1);
ExprResult PointerArgResult =
DefaultFunctionArrayLvalueConversion(PointerArg);
if (PointerArgResult.isInvalid())
return ExprError();
PointerArg = PointerArgResult.get();
TheCall->setArg(numArgs - 1, PointerArg);
const PointerType *pointerType = PointerArg->getType()->getAs<PointerType>();
if (!pointerType) {
Diag(DRE->getBeginLoc(), diag::err_nontemporal_builtin_must_be_pointer)
<< PointerArg->getType() << PointerArg->getSourceRange();
return ExprError();
}
QualType ValType = pointerType->getPointeeType();
// Strip any qualifiers off ValType.
ValType = ValType.getUnqualifiedType();
if (!ValType->isIntegerType() && !ValType->isAnyPointerType() &&
!ValType->isBlockPointerType() && !ValType->isFloatingType() &&
!ValType->isVectorType()) {
Diag(DRE->getBeginLoc(),
diag::err_nontemporal_builtin_must_be_pointer_intfltptr_or_vector)
<< PointerArg->getType() << PointerArg->getSourceRange();
return ExprError();
}
if (!isStore) {
TheCall->setType(ValType);
return TheCallResult;
}
ExprResult ValArg = TheCall->getArg(0);
InitializedEntity Entity = InitializedEntity::InitializeParameter(
Context, ValType, /*consume*/ false);
ValArg = PerformCopyInitialization(Entity, SourceLocation(), ValArg);
if (ValArg.isInvalid())
return ExprError();
TheCall->setArg(0, ValArg.get());
TheCall->setType(Context.VoidTy);
return TheCallResult;
}
/// CheckObjCString - Checks that the argument to the builtin
/// CFString constructor is correct
/// Note: It might also make sense to do the UTF-16 conversion here (would
/// simplify the backend).
bool Sema::CheckObjCString(Expr *Arg) {
Arg = Arg->IgnoreParenCasts();
StringLiteral *Literal = dyn_cast<StringLiteral>(Arg);
if (!Literal || !Literal->isAscii()) {
Diag(Arg->getBeginLoc(), diag::err_cfstring_literal_not_string_constant)
<< Arg->getSourceRange();
return true;
}
if (Literal->containsNonAsciiOrNull()) {
StringRef String = Literal->getString();
unsigned NumBytes = String.size();
SmallVector<llvm::UTF16, 128> ToBuf(NumBytes);
const llvm::UTF8 *FromPtr = (const llvm::UTF8 *)String.data();
llvm::UTF16 *ToPtr = &ToBuf[0];
llvm::ConversionResult Result =
llvm::ConvertUTF8toUTF16(&FromPtr, FromPtr + NumBytes, &ToPtr,
ToPtr + NumBytes, llvm::strictConversion);
// Check for conversion failure.
if (Result != llvm::conversionOK)
Diag(Arg->getBeginLoc(), diag::warn_cfstring_truncated)
<< Arg->getSourceRange();
}
return false;
}
/// CheckObjCString - Checks that the format string argument to the os_log()
/// and os_trace() functions is correct, and converts it to const char *.
ExprResult Sema::CheckOSLogFormatStringArg(Expr *Arg) {
Arg = Arg->IgnoreParenCasts();
auto *Literal = dyn_cast<StringLiteral>(Arg);
if (!Literal) {
if (auto *ObjcLiteral = dyn_cast<ObjCStringLiteral>(Arg)) {
Literal = ObjcLiteral->getString();
}
}
if (!Literal || (!Literal->isAscii() && !Literal->isUTF8())) {
return ExprError(
Diag(Arg->getBeginLoc(), diag::err_os_log_format_not_string_constant)
<< Arg->getSourceRange());
}
ExprResult Result(Literal);
QualType ResultTy = Context.getPointerType(Context.CharTy.withConst());
InitializedEntity Entity =
InitializedEntity::InitializeParameter(Context, ResultTy, false);
Result = PerformCopyInitialization(Entity, SourceLocation(), Result);
return Result;
}
/// Check that the user is calling the appropriate va_start builtin for the
/// target and calling convention.
static bool checkVAStartABI(Sema &S, unsigned BuiltinID, Expr *Fn) {
const llvm::Triple &TT = S.Context.getTargetInfo().getTriple();
bool IsX64 = TT.getArch() == llvm::Triple::x86_64;
bool IsAArch64 = (TT.getArch() == llvm::Triple::aarch64 ||
TT.getArch() == llvm::Triple::aarch64_32);
bool IsWindows = TT.isOSWindows();
bool IsMSVAStart = BuiltinID == Builtin::BI__builtin_ms_va_start;
if (IsX64 || IsAArch64) {
CallingConv CC = CC_C;
if (const FunctionDecl *FD = S.getCurFunctionDecl())
CC = FD->getType()->castAs<FunctionType>()->getCallConv();
if (IsMSVAStart) {
// Don't allow this in System V ABI functions.
if (CC == CC_X86_64SysV || (!IsWindows && CC != CC_Win64))
return S.Diag(Fn->getBeginLoc(),
diag::err_ms_va_start_used_in_sysv_function);
} else {
// On x86-64/AArch64 Unix, don't allow this in Win64 ABI functions.
// On x64 Windows, don't allow this in System V ABI functions.
// (Yes, that means there's no corresponding way to support variadic
// System V ABI functions on Windows.)
if ((IsWindows && CC == CC_X86_64SysV) ||
(!IsWindows && CC == CC_Win64))
return S.Diag(Fn->getBeginLoc(),
diag::err_va_start_used_in_wrong_abi_function)
<< !IsWindows;
}
return false;
}
if (IsMSVAStart)
return S.Diag(Fn->getBeginLoc(), diag::err_builtin_x64_aarch64_only);
return false;
}
static bool checkVAStartIsInVariadicFunction(Sema &S, Expr *Fn,
ParmVarDecl **LastParam = nullptr) {
// Determine whether the current function, block, or obj-c method is variadic
// and get its parameter list.
bool IsVariadic = false;
ArrayRef<ParmVarDecl *> Params;
DeclContext *Caller = S.CurContext;
if (auto *Block = dyn_cast<BlockDecl>(Caller)) {
IsVariadic = Block->isVariadic();
Params = Block->parameters();
} else if (auto *FD = dyn_cast<FunctionDecl>(Caller)) {
IsVariadic = FD->isVariadic();
Params = FD->parameters();
} else if (auto *MD = dyn_cast<ObjCMethodDecl>(Caller)) {
IsVariadic = MD->isVariadic();
// FIXME: This isn't correct for methods (results in bogus warning).
Params = MD->parameters();
} else if (isa<CapturedDecl>(Caller)) {
// We don't support va_start in a CapturedDecl.
S.Diag(Fn->getBeginLoc(), diag::err_va_start_captured_stmt);
return true;
} else {
// This must be some other declcontext that parses exprs.
S.Diag(Fn->getBeginLoc(), diag::err_va_start_outside_function);
return true;
}
if (!IsVariadic) {
S.Diag(Fn->getBeginLoc(), diag::err_va_start_fixed_function);
return true;
}
if (LastParam)
*LastParam = Params.empty() ? nullptr : Params.back();
return false;
}
/// Check the arguments to '__builtin_va_start' or '__builtin_ms_va_start'
/// for validity. Emit an error and return true on failure; return false
/// on success.
bool Sema::SemaBuiltinVAStart(unsigned BuiltinID, CallExpr *TheCall) {
Expr *Fn = TheCall->getCallee();
if (checkVAStartABI(*this, BuiltinID, Fn))
return true;
if (checkArgCount(*this, TheCall, 2))
return true;
// Type-check the first argument normally.
if (checkBuiltinArgument(*this, TheCall, 0))
return true;
// Check that the current function is variadic, and get its last parameter.
ParmVarDecl *LastParam;
if (checkVAStartIsInVariadicFunction(*this, Fn, &LastParam))
return true;
// Verify that the second argument to the builtin is the last argument of the
// current function or method.
bool SecondArgIsLastNamedArgument = false;
const Expr *Arg = TheCall->getArg(1)->IgnoreParenCasts();
// These are valid if SecondArgIsLastNamedArgument is false after the next
// block.
QualType Type;
SourceLocation ParamLoc;
bool IsCRegister = false;
if (const DeclRefExpr *DR = dyn_cast<DeclRefExpr>(Arg)) {
if (const ParmVarDecl *PV = dyn_cast<ParmVarDecl>(DR->getDecl())) {
SecondArgIsLastNamedArgument = PV == LastParam;
Type = PV->getType();
ParamLoc = PV->getLocation();
IsCRegister =
PV->getStorageClass() == SC_Register && !getLangOpts().CPlusPlus;
}
}
if (!SecondArgIsLastNamedArgument)
Diag(TheCall->getArg(1)->getBeginLoc(),
diag::warn_second_arg_of_va_start_not_last_named_param);
else if (IsCRegister || Type->isReferenceType() ||
Type->isSpecificBuiltinType(BuiltinType::Float) || [=] {
// Promotable integers are UB, but enumerations need a bit of
// extra checking to see what their promotable type actually is.
if (!Type->isPromotableIntegerType())
return false;
if (!Type->isEnumeralType())
return true;
const EnumDecl *ED = Type->castAs<EnumType>()->getDecl();
return !(ED &&
Context.typesAreCompatible(ED->getPromotionType(), Type));
}()) {
unsigned Reason = 0;
if (Type->isReferenceType()) Reason = 1;
else if (IsCRegister) Reason = 2;
Diag(Arg->getBeginLoc(), diag::warn_va_start_type_is_undefined) << Reason;
Diag(ParamLoc, diag::note_parameter_type) << Type;
}
TheCall->setType(Context.VoidTy);
return false;
}
bool Sema::SemaBuiltinVAStartARMMicrosoft(CallExpr *Call) {
// void __va_start(va_list *ap, const char *named_addr, size_t slot_size,
// const char *named_addr);
Expr *Func = Call->getCallee();
if (Call->getNumArgs() < 3)
return Diag(Call->getEndLoc(),
diag::err_typecheck_call_too_few_args_at_least)
<< 0 /*function call*/ << 3 << Call->getNumArgs();
// Type-check the first argument normally.
if (checkBuiltinArgument(*this, Call, 0))
return true;
// Check that the current function is variadic.
if (checkVAStartIsInVariadicFunction(*this, Func))
return true;
// __va_start on Windows does not validate the parameter qualifiers
const Expr *Arg1 = Call->getArg(1)->IgnoreParens();
const Type *Arg1Ty = Arg1->getType().getCanonicalType().getTypePtr();
const Expr *Arg2 = Call->getArg(2)->IgnoreParens();
const Type *Arg2Ty = Arg2->getType().getCanonicalType().getTypePtr();
const QualType &ConstCharPtrTy =
Context.getPointerType(Context.CharTy.withConst());
if (!Arg1Ty->isPointerType() ||
Arg1Ty->getPointeeType().withoutLocalFastQualifiers() != Context.CharTy)
Diag(Arg1->getBeginLoc(), diag::err_typecheck_convert_incompatible)
<< Arg1->getType() << ConstCharPtrTy << 1 /* different class */
<< 0 /* qualifier difference */
<< 3 /* parameter mismatch */
<< 2 << Arg1->getType() << ConstCharPtrTy;
const QualType SizeTy = Context.getSizeType();
if (Arg2Ty->getCanonicalTypeInternal().withoutLocalFastQualifiers() != SizeTy)
Diag(Arg2->getBeginLoc(), diag::err_typecheck_convert_incompatible)
<< Arg2->getType() << SizeTy << 1 /* different class */
<< 0 /* qualifier difference */
<< 3 /* parameter mismatch */
<< 3 << Arg2->getType() << SizeTy;
return false;
}
/// SemaBuiltinUnorderedCompare - Handle functions like __builtin_isgreater and
/// friends. This is declared to take (...), so we have to check everything.
bool Sema::SemaBuiltinUnorderedCompare(CallExpr *TheCall) {
if (checkArgCount(*this, TheCall, 2))
return true;
ExprResult OrigArg0 = TheCall->getArg(0);
ExprResult OrigArg1 = TheCall->getArg(1);
// Do standard promotions between the two arguments, returning their common
// type.
QualType Res = UsualArithmeticConversions(
OrigArg0, OrigArg1, TheCall->getExprLoc(), ACK_Comparison);
if (OrigArg0.isInvalid() || OrigArg1.isInvalid())
return true;
// Make sure any conversions are pushed back into the call; this is
// type safe since unordered compare builtins are declared as "_Bool
// foo(...)".
TheCall->setArg(0, OrigArg0.get());
TheCall->setArg(1, OrigArg1.get());
if (OrigArg0.get()->isTypeDependent() || OrigArg1.get()->isTypeDependent())
return false;
// If the common type isn't a real floating type, then the arguments were
// invalid for this operation.
if (Res.isNull() || !Res->isRealFloatingType())
return Diag(OrigArg0.get()->getBeginLoc(),
diag::err_typecheck_call_invalid_ordered_compare)
<< OrigArg0.get()->getType() << OrigArg1.get()->getType()
<< SourceRange(OrigArg0.get()->getBeginLoc(),
OrigArg1.get()->getEndLoc());
return false;
}
/// SemaBuiltinSemaBuiltinFPClassification - Handle functions like
/// __builtin_isnan and friends. This is declared to take (...), so we have
/// to check everything. We expect the last argument to be a floating point
/// value.
bool Sema::SemaBuiltinFPClassification(CallExpr *TheCall, unsigned NumArgs) {
if (checkArgCount(*this, TheCall, NumArgs))
return true;
// __builtin_fpclassify is the only case where NumArgs != 1, so we can count
// on all preceding parameters just being int. Try all of those.
for (unsigned i = 0; i < NumArgs - 1; ++i) {
Expr *Arg = TheCall->getArg(i);
if (Arg->isTypeDependent())
return false;
ExprResult Res = PerformImplicitConversion(Arg, Context.IntTy, AA_Passing);
if (Res.isInvalid())
return true;
TheCall->setArg(i, Res.get());
}
Expr *OrigArg = TheCall->getArg(NumArgs-1);
if (OrigArg->isTypeDependent())
return false;
// Usual Unary Conversions will convert half to float, which we want for
// machines that use fp16 conversion intrinsics. Else, we wnat to leave the
// type how it is, but do normal L->Rvalue conversions.
if (Context.getTargetInfo().useFP16ConversionIntrinsics())
OrigArg = UsualUnaryConversions(OrigArg).get();
else
OrigArg = DefaultFunctionArrayLvalueConversion(OrigArg).get();
TheCall->setArg(NumArgs - 1, OrigArg);
// This operation requires a non-_Complex floating-point number.
if (!OrigArg->getType()->isRealFloatingType())
return Diag(OrigArg->getBeginLoc(),
diag::err_typecheck_call_invalid_unary_fp)
<< OrigArg->getType() << OrigArg->getSourceRange();
return false;
}
/// Perform semantic analysis for a call to __builtin_complex.
bool Sema::SemaBuiltinComplex(CallExpr *TheCall) {
if (checkArgCount(*this, TheCall, 2))
return true;
bool Dependent = false;
for (unsigned I = 0; I != 2; ++I) {
Expr *Arg = TheCall->getArg(I);
QualType T = Arg->getType();
if (T->isDependentType()) {
Dependent = true;
continue;
}
// Despite supporting _Complex int, GCC requires a real floating point type
// for the operands of __builtin_complex.
if (!T->isRealFloatingType()) {
return Diag(Arg->getBeginLoc(), diag::err_typecheck_call_requires_real_fp)
<< Arg->getType() << Arg->getSourceRange();
}
ExprResult Converted = DefaultLvalueConversion(Arg);
if (Converted.isInvalid())
return true;
TheCall->setArg(I, Converted.get());
}
if (Dependent) {
TheCall->setType(Context.DependentTy);
return false;
}
Expr *Real = TheCall->getArg(0);
Expr *Imag = TheCall->getArg(1);
if (!Context.hasSameType(Real->getType(), Imag->getType())) {
return Diag(Real->getBeginLoc(),
diag::err_typecheck_call_different_arg_types)
<< Real->getType() << Imag->getType()
<< Real->getSourceRange() << Imag->getSourceRange();
}
// We don't allow _Complex _Float16 nor _Complex __fp16 as type specifiers;
// don't allow this builtin to form those types either.
// FIXME: Should we allow these types?
if (Real->getType()->isFloat16Type())
return Diag(TheCall->getBeginLoc(), diag::err_invalid_complex_spec)
<< "_Float16";
if (Real->getType()->isHalfType())
return Diag(TheCall->getBeginLoc(), diag::err_invalid_complex_spec)
<< "half";
TheCall->setType(Context.getComplexType(Real->getType()));
return false;
}
// Customized Sema Checking for VSX builtins that have the following signature:
// vector [...] builtinName(vector [...], vector [...], const int);
// Which takes the same type of vectors (any legal vector type) for the first
// two arguments and takes compile time constant for the third argument.
// Example builtins are :
// vector double vec_xxpermdi(vector double, vector double, int);
// vector short vec_xxsldwi(vector short, vector short, int);
bool Sema::SemaBuiltinVSX(CallExpr *TheCall) {
unsigned ExpectedNumArgs = 3;
if (checkArgCount(*this, TheCall, ExpectedNumArgs))
return true;
// Check the third argument is a compile time constant
if (!TheCall->getArg(2)->isIntegerConstantExpr(Context))
return Diag(TheCall->getBeginLoc(),
diag::err_vsx_builtin_nonconstant_argument)
<< 3 /* argument index */ << TheCall->getDirectCallee()
<< SourceRange(TheCall->getArg(2)->getBeginLoc(),
TheCall->getArg(2)->getEndLoc());
QualType Arg1Ty = TheCall->getArg(0)->getType();
QualType Arg2Ty = TheCall->getArg(1)->getType();
// Check the type of argument 1 and argument 2 are vectors.
SourceLocation BuiltinLoc = TheCall->getBeginLoc();
if ((!Arg1Ty->isVectorType() && !Arg1Ty->isDependentType()) ||
(!Arg2Ty->isVectorType() && !Arg2Ty->isDependentType())) {
return Diag(BuiltinLoc, diag::err_vec_builtin_non_vector)
<< TheCall->getDirectCallee()
<< SourceRange(TheCall->getArg(0)->getBeginLoc(),
TheCall->getArg(1)->getEndLoc());
}
// Check the first two arguments are the same type.
if (!Context.hasSameUnqualifiedType(Arg1Ty, Arg2Ty)) {
return Diag(BuiltinLoc, diag::err_vec_builtin_incompatible_vector)
<< TheCall->getDirectCallee()
<< SourceRange(TheCall->getArg(0)->getBeginLoc(),
TheCall->getArg(1)->getEndLoc());
}
// When default clang type checking is turned off and the customized type
// checking is used, the returning type of the function must be explicitly
// set. Otherwise it is _Bool by default.
TheCall->setType(Arg1Ty);
return false;
}
/// SemaBuiltinShuffleVector - Handle __builtin_shufflevector.
// This is declared to take (...), so we have to check everything.
ExprResult Sema::SemaBuiltinShuffleVector(CallExpr *TheCall) {
if (TheCall->getNumArgs() < 2)
return ExprError(Diag(TheCall->getEndLoc(),
diag::err_typecheck_call_too_few_args_at_least)
<< 0 /*function call*/ << 2 << TheCall->getNumArgs()
<< TheCall->getSourceRange());
// Determine which of the following types of shufflevector we're checking:
// 1) unary, vector mask: (lhs, mask)
// 2) binary, scalar mask: (lhs, rhs, index, ..., index)
QualType resType = TheCall->getArg(0)->getType();
unsigned numElements = 0;
if (!TheCall->getArg(0)->isTypeDependent() &&
!TheCall->getArg(1)->isTypeDependent()) {
QualType LHSType = TheCall->getArg(0)->getType();
QualType RHSType = TheCall->getArg(1)->getType();
if (!LHSType->isVectorType() || !RHSType->isVectorType())
return ExprError(
Diag(TheCall->getBeginLoc(), diag::err_vec_builtin_non_vector)
<< TheCall->getDirectCallee()
<< SourceRange(TheCall->getArg(0)->getBeginLoc(),
TheCall->getArg(1)->getEndLoc()));
numElements = LHSType->castAs<VectorType>()->getNumElements();
unsigned numResElements = TheCall->getNumArgs() - 2;
// Check to see if we have a call with 2 vector arguments, the unary shuffle
// with mask. If so, verify that RHS is an integer vector type with the
// same number of elts as lhs.
if (TheCall->getNumArgs() == 2) {
if (!RHSType->hasIntegerRepresentation() ||
RHSType->castAs<VectorType>()->getNumElements() != numElements)
return ExprError(Diag(TheCall->getBeginLoc(),
diag::err_vec_builtin_incompatible_vector)
<< TheCall->getDirectCallee()
<< SourceRange(TheCall->getArg(1)->getBeginLoc(),
TheCall->getArg(1)->getEndLoc()));
} else if (!Context.hasSameUnqualifiedType(LHSType, RHSType)) {
return ExprError(Diag(TheCall->getBeginLoc(),
diag::err_vec_builtin_incompatible_vector)
<< TheCall->getDirectCallee()
<< SourceRange(TheCall->getArg(0)->getBeginLoc(),
TheCall->getArg(1)->getEndLoc()));
} else if (numElements != numResElements) {
QualType eltType = LHSType->castAs<VectorType>()->getElementType();
resType = Context.getVectorType(eltType, numResElements,
VectorType::GenericVector);
}
}
for (unsigned i = 2; i < TheCall->getNumArgs(); i++) {
if (TheCall->getArg(i)->isTypeDependent() ||
TheCall->getArg(i)->isValueDependent())
continue;
Optional<llvm::APSInt> Result;
if (!(Result = TheCall->getArg(i)->getIntegerConstantExpr(Context)))
return ExprError(Diag(TheCall->getBeginLoc(),
diag::err_shufflevector_nonconstant_argument)
<< TheCall->getArg(i)->getSourceRange());
// Allow -1 which will be translated to undef in the IR.
if (Result->isSigned() && Result->isAllOnesValue())
continue;
if (Result->getActiveBits() > 64 ||
Result->getZExtValue() >= numElements * 2)
return ExprError(Diag(TheCall->getBeginLoc(),
diag::err_shufflevector_argument_too_large)
<< TheCall->getArg(i)->getSourceRange());
}
SmallVector<Expr*, 32> exprs;
for (unsigned i = 0, e = TheCall->getNumArgs(); i != e; i++) {
exprs.push_back(TheCall->getArg(i));
TheCall->setArg(i, nullptr);
}
return new (Context) ShuffleVectorExpr(Context, exprs, resType,
TheCall->getCallee()->getBeginLoc(),
TheCall->getRParenLoc());
}
/// SemaConvertVectorExpr - Handle __builtin_convertvector
ExprResult Sema::SemaConvertVectorExpr(Expr *E, TypeSourceInfo *TInfo,
SourceLocation BuiltinLoc,
SourceLocation RParenLoc) {
ExprValueKind VK = VK_RValue;
ExprObjectKind OK = OK_Ordinary;
QualType DstTy = TInfo->getType();
QualType SrcTy = E->getType();
if (!SrcTy->isVectorType() && !SrcTy->isDependentType())
return ExprError(Diag(BuiltinLoc,
diag::err_convertvector_non_vector)
<< E->getSourceRange());
if (!DstTy->isVectorType() && !DstTy->isDependentType())
return ExprError(Diag(BuiltinLoc,
diag::err_convertvector_non_vector_type));
if (!SrcTy->isDependentType() && !DstTy->isDependentType()) {
unsigned SrcElts = SrcTy->castAs<VectorType>()->getNumElements();
unsigned DstElts = DstTy->castAs<VectorType>()->getNumElements();
if (SrcElts != DstElts)
return ExprError(Diag(BuiltinLoc,
diag::err_convertvector_incompatible_vector)
<< E->getSourceRange());
}
return new (Context)
ConvertVectorExpr(E, TInfo, DstTy, VK, OK, BuiltinLoc, RParenLoc);
}
/// SemaBuiltinPrefetch - Handle __builtin_prefetch.
// This is declared to take (const void*, ...) and can take two
// optional constant int args.
bool Sema::SemaBuiltinPrefetch(CallExpr *TheCall) {
unsigned NumArgs = TheCall->getNumArgs();
if (NumArgs > 3)
return Diag(TheCall->getEndLoc(),
diag::err_typecheck_call_too_many_args_at_most)
<< 0 /*function call*/ << 3 << NumArgs << TheCall->getSourceRange();
// Argument 0 is checked for us and the remaining arguments must be
// constant integers.
for (unsigned i = 1; i != NumArgs; ++i)
if (SemaBuiltinConstantArgRange(TheCall, i, 0, i == 1 ? 1 : 3))
return true;
return false;
}
/// SemaBuiltinAssume - Handle __assume (MS Extension).
// __assume does not evaluate its arguments, and should warn if its argument
// has side effects.
bool Sema::SemaBuiltinAssume(CallExpr *TheCall) {
Expr *Arg = TheCall->getArg(0);
if (Arg->isInstantiationDependent()) return false;
if (Arg->HasSideEffects(Context))
Diag(Arg->getBeginLoc(), diag::warn_assume_side_effects)
<< Arg->getSourceRange()
<< cast<FunctionDecl>(TheCall->getCalleeDecl())->getIdentifier();
return false;
}
/// Handle __builtin_alloca_with_align. This is declared
/// as (size_t, size_t) where the second size_t must be a power of 2 greater
/// than 8.
bool Sema::SemaBuiltinAllocaWithAlign(CallExpr *TheCall) {
// The alignment must be a constant integer.
Expr *Arg = TheCall->getArg(1);
// We can't check the value of a dependent argument.
if (!Arg->isTypeDependent() && !Arg->isValueDependent()) {
if (const auto *UE =
dyn_cast<UnaryExprOrTypeTraitExpr>(Arg->IgnoreParenImpCasts()))
if (UE->getKind() == UETT_AlignOf ||
UE->getKind() == UETT_PreferredAlignOf)
Diag(TheCall->getBeginLoc(), diag::warn_alloca_align_alignof)
<< Arg->getSourceRange();
llvm::APSInt Result = Arg->EvaluateKnownConstInt(Context);
if (!Result.isPowerOf2())
return Diag(TheCall->getBeginLoc(), diag::err_alignment_not_power_of_two)
<< Arg->getSourceRange();
if (Result < Context.getCharWidth())
return Diag(TheCall->getBeginLoc(), diag::err_alignment_too_small)
<< (unsigned)Context.getCharWidth() << Arg->getSourceRange();
if (Result > std::numeric_limits<int32_t>::max())
return Diag(TheCall->getBeginLoc(), diag::err_alignment_too_big)
<< std::numeric_limits<int32_t>::max() << Arg->getSourceRange();
}
return false;
}
/// Handle __builtin_assume_aligned. This is declared
/// as (const void*, size_t, ...) and can take one optional constant int arg.
bool Sema::SemaBuiltinAssumeAligned(CallExpr *TheCall) {
unsigned NumArgs = TheCall->getNumArgs();
if (NumArgs > 3)
return Diag(TheCall->getEndLoc(),
diag::err_typecheck_call_too_many_args_at_most)
<< 0 /*function call*/ << 3 << NumArgs << TheCall->getSourceRange();
// The alignment must be a constant integer.
Expr *Arg = TheCall->getArg(1);
// We can't check the value of a dependent argument.
if (!Arg->isTypeDependent() && !Arg->isValueDependent()) {
llvm::APSInt Result;
if (SemaBuiltinConstantArg(TheCall, 1, Result))
return true;
if (!Result.isPowerOf2())
return Diag(TheCall->getBeginLoc(), diag::err_alignment_not_power_of_two)
<< Arg->getSourceRange();
if (Result > Sema::MaximumAlignment)
Diag(TheCall->getBeginLoc(), diag::warn_assume_aligned_too_great)
<< Arg->getSourceRange() << Sema::MaximumAlignment;
}
if (NumArgs > 2) {
ExprResult Arg(TheCall->getArg(2));
InitializedEntity Entity = InitializedEntity::InitializeParameter(Context,
Context.getSizeType(), false);
Arg = PerformCopyInitialization(Entity, SourceLocation(), Arg);
if (Arg.isInvalid()) return true;
TheCall->setArg(2, Arg.get());
}
return false;
}
bool Sema::SemaBuiltinOSLogFormat(CallExpr *TheCall) {
unsigned BuiltinID =
cast<FunctionDecl>(TheCall->getCalleeDecl())->getBuiltinID();
bool IsSizeCall = BuiltinID == Builtin::BI__builtin_os_log_format_buffer_size;
unsigned NumArgs = TheCall->getNumArgs();
unsigned NumRequiredArgs = IsSizeCall ? 1 : 2;
if (NumArgs < NumRequiredArgs) {
return Diag(TheCall->getEndLoc(), diag::err_typecheck_call_too_few_args)
<< 0 /* function call */ << NumRequiredArgs << NumArgs
<< TheCall->getSourceRange();
}
if (NumArgs >= NumRequiredArgs + 0x100) {
return Diag(TheCall->getEndLoc(),
diag::err_typecheck_call_too_many_args_at_most)
<< 0 /* function call */ << (NumRequiredArgs + 0xff) << NumArgs
<< TheCall->getSourceRange();
}
unsigned i = 0;
// For formatting call, check buffer arg.
if (!IsSizeCall) {
ExprResult Arg(TheCall->getArg(i));
InitializedEntity Entity = InitializedEntity::InitializeParameter(
Context, Context.VoidPtrTy, false);
Arg = PerformCopyInitialization(Entity, SourceLocation(), Arg);
if (Arg.isInvalid())
return true;
TheCall->setArg(i, Arg.get());
i++;
}
// Check string literal arg.
unsigned FormatIdx = i;
{
ExprResult Arg = CheckOSLogFormatStringArg(TheCall->getArg(i));
if (Arg.isInvalid())
return true;
TheCall->setArg(i, Arg.get());
i++;
}
// Make sure variadic args are scalar.
unsigned FirstDataArg = i;
while (i < NumArgs) {
ExprResult Arg = DefaultVariadicArgumentPromotion(
TheCall->getArg(i), VariadicFunction, nullptr);
if (Arg.isInvalid())
return true;
CharUnits ArgSize = Context.getTypeSizeInChars(Arg.get()->getType());
if (ArgSize.getQuantity() >= 0x100) {
return Diag(Arg.get()->getEndLoc(), diag::err_os_log_argument_too_big)
<< i << (int)ArgSize.getQuantity() << 0xff
<< TheCall->getSourceRange();
}
TheCall->setArg(i, Arg.get());
i++;
}
// Check formatting specifiers. NOTE: We're only doing this for the non-size
// call to avoid duplicate diagnostics.
if (!IsSizeCall) {
llvm::SmallBitVector CheckedVarArgs(NumArgs, false);
ArrayRef<const Expr *> Args(TheCall->getArgs(), TheCall->getNumArgs());
bool Success = CheckFormatArguments(
Args, /*HasVAListArg*/ false, FormatIdx, FirstDataArg, FST_OSLog,
VariadicFunction, TheCall->getBeginLoc(), SourceRange(),
CheckedVarArgs);
if (!Success)
return true;
}
if (IsSizeCall) {
TheCall->setType(Context.getSizeType());
} else {
TheCall->setType(Context.VoidPtrTy);
}
return false;
}
/// SemaBuiltinConstantArg - Handle a check if argument ArgNum of CallExpr
/// TheCall is a constant expression.
bool Sema::SemaBuiltinConstantArg(CallExpr *TheCall, int ArgNum,
llvm::APSInt &Result) {
Expr *Arg = TheCall->getArg(ArgNum);
DeclRefExpr *DRE =cast<DeclRefExpr>(TheCall->getCallee()->IgnoreParenCasts());
FunctionDecl *FDecl = cast<FunctionDecl>(DRE->getDecl());
if (Arg->isTypeDependent() || Arg->isValueDependent()) return false;
Optional<llvm::APSInt> R;
if (!(R = Arg->getIntegerConstantExpr(Context)))
return Diag(TheCall->getBeginLoc(), diag::err_constant_integer_arg_type)
<< FDecl->getDeclName() << Arg->getSourceRange();
Result = *R;
return false;
}
/// SemaBuiltinConstantArgRange - Handle a check if argument ArgNum of CallExpr
/// TheCall is a constant expression in the range [Low, High].
bool Sema::SemaBuiltinConstantArgRange(CallExpr *TheCall, int ArgNum,
int Low, int High, bool RangeIsError) {
if (isConstantEvaluated())
return false;
llvm::APSInt Result;
// We can't check the value of a dependent argument.
Expr *Arg = TheCall->getArg(ArgNum);
if (Arg->isTypeDependent() || Arg->isValueDependent())
return false;
// Check constant-ness first.
if (SemaBuiltinConstantArg(TheCall, ArgNum, Result))
return true;
if (Result.getSExtValue() < Low || Result.getSExtValue() > High) {
if (RangeIsError)
return Diag(TheCall->getBeginLoc(), diag::err_argument_invalid_range)
<< Result.toString(10) << Low << High << Arg->getSourceRange();
else
// Defer the warning until we know if the code will be emitted so that
// dead code can ignore this.
DiagRuntimeBehavior(TheCall->getBeginLoc(), TheCall,
PDiag(diag::warn_argument_invalid_range)
<< Result.toString(10) << Low << High
<< Arg->getSourceRange());
}
return false;
}
/// SemaBuiltinConstantArgMultiple - Handle a check if argument ArgNum of CallExpr
/// TheCall is a constant expression is a multiple of Num..
bool Sema::SemaBuiltinConstantArgMultiple(CallExpr *TheCall, int ArgNum,
unsigned Num) {
llvm::APSInt Result;
// We can't check the value of a dependent argument.
Expr *Arg = TheCall->getArg(ArgNum);
if (Arg->isTypeDependent() || Arg->isValueDependent())
return false;
// Check constant-ness first.
if (SemaBuiltinConstantArg(TheCall, ArgNum, Result))
return true;
if (Result.getSExtValue() % Num != 0)
return Diag(TheCall->getBeginLoc(), diag::err_argument_not_multiple)
<< Num << Arg->getSourceRange();
return false;
}
/// SemaBuiltinConstantArgPower2 - Check if argument ArgNum of TheCall is a
/// constant expression representing a power of 2.
bool Sema::SemaBuiltinConstantArgPower2(CallExpr *TheCall, int ArgNum) {
llvm::APSInt Result;
// We can't check the value of a dependent argument.
Expr *Arg = TheCall->getArg(ArgNum);
if (Arg->isTypeDependent() || Arg->isValueDependent())
return false;
// Check constant-ness first.
if (SemaBuiltinConstantArg(TheCall, ArgNum, Result))
return true;
// Bit-twiddling to test for a power of 2: for x > 0, x & (x-1) is zero if
// and only if x is a power of 2.
if (Result.isStrictlyPositive() && (Result & (Result - 1)) == 0)
return false;
return Diag(TheCall->getBeginLoc(), diag::err_argument_not_power_of_2)
<< Arg->getSourceRange();
}
static bool IsShiftedByte(llvm::APSInt Value) {
if (Value.isNegative())
return false;
// Check if it's a shifted byte, by shifting it down
while (true) {
// If the value fits in the bottom byte, the check passes.
if (Value < 0x100)
return true;
// Otherwise, if the value has _any_ bits in the bottom byte, the check
// fails.
if ((Value & 0xFF) != 0)
return false;
// If the bottom 8 bits are all 0, but something above that is nonzero,
// then shifting the value right by 8 bits won't affect whether it's a
// shifted byte or not. So do that, and go round again.
Value >>= 8;
}
}
/// SemaBuiltinConstantArgShiftedByte - Check if argument ArgNum of TheCall is
/// a constant expression representing an arbitrary byte value shifted left by
/// a multiple of 8 bits.
bool Sema::SemaBuiltinConstantArgShiftedByte(CallExpr *TheCall, int ArgNum,
unsigned ArgBits) {
llvm::APSInt Result;
// We can't check the value of a dependent argument.
Expr *Arg = TheCall->getArg(ArgNum);
if (Arg->isTypeDependent() || Arg->isValueDependent())
return false;
// Check constant-ness first.
if (SemaBuiltinConstantArg(TheCall, ArgNum, Result))
return true;
// Truncate to the given size.
Result = Result.getLoBits(ArgBits);
Result.setIsUnsigned(true);
if (IsShiftedByte(Result))
return false;
return Diag(TheCall->getBeginLoc(), diag::err_argument_not_shifted_byte)
<< Arg->getSourceRange();
}
/// SemaBuiltinConstantArgShiftedByteOr0xFF - Check if argument ArgNum of
/// TheCall is a constant expression representing either a shifted byte value,
/// or a value of the form 0x??FF (i.e. a member of the arithmetic progression
/// 0x00FF, 0x01FF, ..., 0xFFFF). This strange range check is needed for some
/// Arm MVE intrinsics.
bool Sema::SemaBuiltinConstantArgShiftedByteOrXXFF(CallExpr *TheCall,
int ArgNum,
unsigned ArgBits) {
llvm::APSInt Result;
// We can't check the value of a dependent argument.
Expr *Arg = TheCall->getArg(ArgNum);
if (Arg->isTypeDependent() || Arg->isValueDependent())
return false;
// Check constant-ness first.
if (SemaBuiltinConstantArg(TheCall, ArgNum, Result))
return true;
// Truncate to the given size.
Result = Result.getLoBits(ArgBits);
Result.setIsUnsigned(true);
// Check to see if it's in either of the required forms.
if (IsShiftedByte(Result) ||
(Result > 0 && Result < 0x10000 && (Result & 0xFF) == 0xFF))
return false;
return Diag(TheCall->getBeginLoc(),
diag::err_argument_not_shifted_byte_or_xxff)
<< Arg->getSourceRange();
}
/// SemaBuiltinARMMemoryTaggingCall - Handle calls of memory tagging extensions
bool Sema::SemaBuiltinARMMemoryTaggingCall(unsigned BuiltinID, CallExpr *TheCall) {
if (BuiltinID == AArch64::BI__builtin_arm_irg) {
if (checkArgCount(*this, TheCall, 2))
return true;
Expr *Arg0 = TheCall->getArg(0);
Expr *Arg1 = TheCall->getArg(1);
ExprResult FirstArg = DefaultFunctionArrayLvalueConversion(Arg0);
if (FirstArg.isInvalid())
return true;
QualType FirstArgType = FirstArg.get()->getType();
if (!FirstArgType->isAnyPointerType())
return Diag(TheCall->getBeginLoc(), diag::err_memtag_arg_must_be_pointer)
<< "first" << FirstArgType << Arg0->getSourceRange();
TheCall->setArg(0, FirstArg.get());
ExprResult SecArg = DefaultLvalueConversion(Arg1);
if (SecArg.isInvalid())
return true;
QualType SecArgType = SecArg.get()->getType();
if (!SecArgType->isIntegerType())
return Diag(TheCall->getBeginLoc(), diag::err_memtag_arg_must_be_integer)
<< "second" << SecArgType << Arg1->getSourceRange();
// Derive the return type from the pointer argument.
TheCall->setType(FirstArgType);
return false;
}
if (BuiltinID == AArch64::BI__builtin_arm_addg) {
if (checkArgCount(*this, TheCall, 2))
return true;
Expr *Arg0 = TheCall->getArg(0);
ExprResult FirstArg = DefaultFunctionArrayLvalueConversion(Arg0);
if (FirstArg.isInvalid())
return true;
QualType FirstArgType = FirstArg.get()->getType();
if (!FirstArgType->isAnyPointerType())
return Diag(TheCall->getBeginLoc(), diag::err_memtag_arg_must_be_pointer)
<< "first" << FirstArgType << Arg0->getSourceRange();
TheCall->setArg(0, FirstArg.get());
// Derive the return type from the pointer argument.
TheCall->setType(FirstArgType);
// Second arg must be an constant in range [0,15]
return SemaBuiltinConstantArgRange(TheCall, 1, 0, 15);
}
if (BuiltinID == AArch64::BI__builtin_arm_gmi) {
if (checkArgCount(*this, TheCall, 2))
return true;
Expr *Arg0 = TheCall->getArg(0);
Expr *Arg1 = TheCall->getArg(1);
ExprResult FirstArg = DefaultFunctionArrayLvalueConversion(Arg0);
if (FirstArg.isInvalid())
return true;
QualType FirstArgType = FirstArg.get()->getType();
if (!FirstArgType->isAnyPointerType())
return Diag(TheCall->getBeginLoc(), diag::err_memtag_arg_must_be_pointer)
<< "first" << FirstArgType << Arg0->getSourceRange();
QualType SecArgType = Arg1->getType();
if (!SecArgType->isIntegerType())
return Diag(TheCall->getBeginLoc(), diag::err_memtag_arg_must_be_integer)
<< "second" << SecArgType << Arg1->getSourceRange();
TheCall->setType(Context.IntTy);
return false;
}
if (BuiltinID == AArch64::BI__builtin_arm_ldg ||
BuiltinID == AArch64::BI__builtin_arm_stg) {
if (checkArgCount(*this, TheCall, 1))
return true;
Expr *Arg0 = TheCall->getArg(0);
ExprResult FirstArg = DefaultFunctionArrayLvalueConversion(Arg0);
if (FirstArg.isInvalid())
return true;
QualType FirstArgType = FirstArg.get()->getType();
if (!FirstArgType->isAnyPointerType())
return Diag(TheCall->getBeginLoc(), diag::err_memtag_arg_must_be_pointer)
<< "first" << FirstArgType << Arg0->getSourceRange();
TheCall->setArg(0, FirstArg.get());
// Derive the return type from the pointer argument.
if (BuiltinID == AArch64::BI__builtin_arm_ldg)
TheCall->setType(FirstArgType);
return false;
}
if (BuiltinID == AArch64::BI__builtin_arm_subp) {
Expr *ArgA = TheCall->getArg(0);
Expr *ArgB = TheCall->getArg(1);
ExprResult ArgExprA = DefaultFunctionArrayLvalueConversion(ArgA);
ExprResult ArgExprB = DefaultFunctionArrayLvalueConversion(ArgB);
if (ArgExprA.isInvalid() || ArgExprB.isInvalid())
return true;
QualType ArgTypeA = ArgExprA.get()->getType();
QualType ArgTypeB = ArgExprB.get()->getType();
auto isNull = [&] (Expr *E) -> bool {
return E->isNullPointerConstant(
Context, Expr::NPC_ValueDependentIsNotNull); };
// argument should be either a pointer or null
if (!ArgTypeA->isAnyPointerType() && !isNull(ArgA))
return Diag(TheCall->getBeginLoc(), diag::err_memtag_arg_null_or_pointer)
<< "first" << ArgTypeA << ArgA->getSourceRange();
if (!ArgTypeB->isAnyPointerType() && !isNull(ArgB))
return Diag(TheCall->getBeginLoc(), diag::err_memtag_arg_null_or_pointer)
<< "second" << ArgTypeB << ArgB->getSourceRange();
// Ensure Pointee types are compatible
if (ArgTypeA->isAnyPointerType() && !isNull(ArgA) &&
ArgTypeB->isAnyPointerType() && !isNull(ArgB)) {
QualType pointeeA = ArgTypeA->getPointeeType();
QualType pointeeB = ArgTypeB->getPointeeType();
if (!Context.typesAreCompatible(
Context.getCanonicalType(pointeeA).getUnqualifiedType(),
Context.getCanonicalType(pointeeB).getUnqualifiedType())) {
return Diag(TheCall->getBeginLoc(), diag::err_typecheck_sub_ptr_compatible)
<< ArgTypeA << ArgTypeB << ArgA->getSourceRange()
<< ArgB->getSourceRange();
}
}
// at least one argument should be pointer type
if (!ArgTypeA->isAnyPointerType() && !ArgTypeB->isAnyPointerType())
return Diag(TheCall->getBeginLoc(), diag::err_memtag_any2arg_pointer)
<< ArgTypeA << ArgTypeB << ArgA->getSourceRange();
if (isNull(ArgA)) // adopt type of the other pointer
ArgExprA = ImpCastExprToType(ArgExprA.get(), ArgTypeB, CK_NullToPointer);
if (isNull(ArgB))
ArgExprB = ImpCastExprToType(ArgExprB.get(), ArgTypeA, CK_NullToPointer);
TheCall->setArg(0, ArgExprA.get());
TheCall->setArg(1, ArgExprB.get());
TheCall->setType(Context.LongLongTy);
return false;
}
assert(false && "Unhandled ARM MTE intrinsic");
return true;
}
/// SemaBuiltinARMSpecialReg - Handle a check if argument ArgNum of CallExpr
/// TheCall is an ARM/AArch64 special register string literal.
bool Sema::SemaBuiltinARMSpecialReg(unsigned BuiltinID, CallExpr *TheCall,
int ArgNum, unsigned ExpectedFieldNum,
bool AllowName) {
bool IsARMBuiltin = BuiltinID == ARM::BI__builtin_arm_rsr64 ||
BuiltinID == ARM::BI__builtin_arm_wsr64 ||
BuiltinID == ARM::BI__builtin_arm_rsr ||
BuiltinID == ARM::BI__builtin_arm_rsrp ||
BuiltinID == ARM::BI__builtin_arm_wsr ||
BuiltinID == ARM::BI__builtin_arm_wsrp;
bool IsAArch64Builtin = BuiltinID == AArch64::BI__builtin_arm_rsr64 ||
BuiltinID == AArch64::BI__builtin_arm_wsr64 ||
BuiltinID == AArch64::BI__builtin_arm_rsr ||
BuiltinID == AArch64::BI__builtin_arm_rsrp ||
BuiltinID == AArch64::BI__builtin_arm_wsr ||
BuiltinID == AArch64::BI__builtin_arm_wsrp;
assert((IsARMBuiltin || IsAArch64Builtin) && "Unexpected ARM builtin.");
// We can't check the value of a dependent argument.
Expr *Arg = TheCall->getArg(ArgNum);
if (Arg->isTypeDependent() || Arg->isValueDependent())
return false;
// Check if the argument is a string literal.
if (!isa<StringLiteral>(Arg->IgnoreParenImpCasts()))
return Diag(TheCall->getBeginLoc(), diag::err_expr_not_string_literal)
<< Arg->getSourceRange();
// Check the type of special register given.
StringRef Reg = cast<StringLiteral>(Arg->IgnoreParenImpCasts())->getString();
SmallVector<StringRef, 6> Fields;
Reg.split(Fields, ":");
if (Fields.size() != ExpectedFieldNum && !(AllowName && Fields.size() == 1))
return Diag(TheCall->getBeginLoc(), diag::err_arm_invalid_specialreg)
<< Arg->getSourceRange();
// If the string is the name of a register then we cannot check that it is
// valid here but if the string is of one the forms described in ACLE then we
// can check that the supplied fields are integers and within the valid
// ranges.
if (Fields.size() > 1) {
bool FiveFields = Fields.size() == 5;
bool ValidString = true;
if (IsARMBuiltin) {
ValidString &= Fields[0].startswith_lower("cp") ||
Fields[0].startswith_lower("p");
if (ValidString)
Fields[0] =
Fields[0].drop_front(Fields[0].startswith_lower("cp") ? 2 : 1);
ValidString &= Fields[2].startswith_lower("c");
if (ValidString)
Fields[2] = Fields[2].drop_front(1);
if (FiveFields) {
ValidString &= Fields[3].startswith_lower("c");
if (ValidString)
Fields[3] = Fields[3].drop_front(1);
}
}
SmallVector<int, 5> Ranges;
if (FiveFields)
Ranges.append({IsAArch64Builtin ? 1 : 15, 7, 15, 15, 7});
else
Ranges.append({15, 7, 15});
for (unsigned i=0; i<Fields.size(); ++i) {
int IntField;
ValidString &= !Fields[i].getAsInteger(10, IntField);
ValidString &= (IntField >= 0 && IntField <= Ranges[i]);
}
if (!ValidString)
return Diag(TheCall->getBeginLoc(), diag::err_arm_invalid_specialreg)
<< Arg->getSourceRange();
} else if (IsAArch64Builtin && Fields.size() == 1) {
// If the register name is one of those that appear in the condition below
// and the special register builtin being used is one of the write builtins,
// then we require that the argument provided for writing to the register
// is an integer constant expression. This is because it will be lowered to
// an MSR (immediate) instruction, so we need to know the immediate at
// compile time.
if (TheCall->getNumArgs() != 2)
return false;
std::string RegLower = Reg.lower();
if (RegLower != "spsel" && RegLower != "daifset" && RegLower != "daifclr" &&
RegLower != "pan" && RegLower != "uao")
return false;
return SemaBuiltinConstantArgRange(TheCall, 1, 0, 15);
}
return false;
}
/// SemaBuiltinLongjmp - Handle __builtin_longjmp(void *env[5], int val).
/// This checks that the target supports __builtin_longjmp and
/// that val is a constant 1.
bool Sema::SemaBuiltinLongjmp(CallExpr *TheCall) {
if (!Context.getTargetInfo().hasSjLjLowering())
return Diag(TheCall->getBeginLoc(), diag::err_builtin_longjmp_unsupported)
<< SourceRange(TheCall->getBeginLoc(), TheCall->getEndLoc());
Expr *Arg = TheCall->getArg(1);
llvm::APSInt Result;
// TODO: This is less than ideal. Overload this to take a value.
if (SemaBuiltinConstantArg(TheCall, 1, Result))
return true;
if (Result != 1)
return Diag(TheCall->getBeginLoc(), diag::err_builtin_longjmp_invalid_val)
<< SourceRange(Arg->getBeginLoc(), Arg->getEndLoc());
return false;
}
/// SemaBuiltinSetjmp - Handle __builtin_setjmp(void *env[5]).
/// This checks that the target supports __builtin_setjmp.
bool Sema::SemaBuiltinSetjmp(CallExpr *TheCall) {
if (!Context.getTargetInfo().hasSjLjLowering())
return Diag(TheCall->getBeginLoc(), diag::err_builtin_setjmp_unsupported)
<< SourceRange(TheCall->getBeginLoc(), TheCall->getEndLoc());
return false;
}
namespace {
class UncoveredArgHandler {
enum { Unknown = -1, AllCovered = -2 };
signed FirstUncoveredArg = Unknown;
SmallVector<const Expr *, 4> DiagnosticExprs;
public:
UncoveredArgHandler() = default;
bool hasUncoveredArg() const {
return (FirstUncoveredArg >= 0);
}
unsigned getUncoveredArg() const {
assert(hasUncoveredArg() && "no uncovered argument");
return FirstUncoveredArg;
}
void setAllCovered() {
// A string has been found with all arguments covered, so clear out
// the diagnostics.
DiagnosticExprs.clear();
FirstUncoveredArg = AllCovered;
}
void Update(signed NewFirstUncoveredArg, const Expr *StrExpr) {
assert(NewFirstUncoveredArg >= 0 && "Outside range");
// Don't update if a previous string covers all arguments.
if (FirstUncoveredArg == AllCovered)
return;
// UncoveredArgHandler tracks the highest uncovered argument index
// and with it all the strings that match this index.
if (NewFirstUncoveredArg == FirstUncoveredArg)
DiagnosticExprs.push_back(StrExpr);
else if (NewFirstUncoveredArg > FirstUncoveredArg) {
DiagnosticExprs.clear();
DiagnosticExprs.push_back(StrExpr);
FirstUncoveredArg = NewFirstUncoveredArg;
}
}
void Diagnose(Sema &S, bool IsFunctionCall, const Expr *ArgExpr);
};
enum StringLiteralCheckType {
SLCT_NotALiteral,
SLCT_UncheckedLiteral,
SLCT_CheckedLiteral
};
} // namespace
static void sumOffsets(llvm::APSInt &Offset, llvm::APSInt Addend,
BinaryOperatorKind BinOpKind,
bool AddendIsRight) {
unsigned BitWidth = Offset.getBitWidth();
unsigned AddendBitWidth = Addend.getBitWidth();
// There might be negative interim results.
if (Addend.isUnsigned()) {
Addend = Addend.zext(++AddendBitWidth);
Addend.setIsSigned(true);
}
// Adjust the bit width of the APSInts.
if (AddendBitWidth > BitWidth) {
Offset = Offset.sext(AddendBitWidth);
BitWidth = AddendBitWidth;
} else if (BitWidth > AddendBitWidth) {
Addend = Addend.sext(BitWidth);
}
bool Ov = false;
llvm::APSInt ResOffset = Offset;
if (BinOpKind == BO_Add)
ResOffset = Offset.sadd_ov(Addend, Ov);
else {
assert(AddendIsRight && BinOpKind == BO_Sub &&
"operator must be add or sub with addend on the right");
ResOffset = Offset.ssub_ov(Addend, Ov);
}
// We add an offset to a pointer here so we should support an offset as big as
// possible.
if (Ov) {
assert(BitWidth <= std::numeric_limits<unsigned>::max() / 2 &&
"index (intermediate) result too big");
Offset = Offset.sext(2 * BitWidth);
sumOffsets(Offset, Addend, BinOpKind, AddendIsRight);
return;
}
Offset = ResOffset;
}
namespace {
// This is a wrapper class around StringLiteral to support offsetted string
// literals as format strings. It takes the offset into account when returning
// the string and its length or the source locations to display notes correctly.
class FormatStringLiteral {
const StringLiteral *FExpr;
int64_t Offset;
public:
FormatStringLiteral(const StringLiteral *fexpr, int64_t Offset = 0)
: FExpr(fexpr), Offset(Offset) {}
StringRef getString() const {
return FExpr->getString().drop_front(Offset);
}
unsigned getByteLength() const {
return FExpr->getByteLength() - getCharByteWidth() * Offset;
}
unsigned getLength() const { return FExpr->getLength() - Offset; }
unsigned getCharByteWidth() const { return FExpr->getCharByteWidth(); }
StringLiteral::StringKind getKind() const { return FExpr->getKind(); }
QualType getType() const { return FExpr->getType(); }
bool isAscii() const { return FExpr->isAscii(); }
bool isWide() const { return FExpr->isWide(); }
bool isUTF8() const { return FExpr->isUTF8(); }
bool isUTF16() const { return FExpr->isUTF16(); }
bool isUTF32() const { return FExpr->isUTF32(); }
bool isPascal() const { return FExpr->isPascal(); }
SourceLocation getLocationOfByte(
unsigned ByteNo, const SourceManager &SM, const LangOptions &Features,
const TargetInfo &Target, unsigned *StartToken = nullptr,
unsigned *StartTokenByteOffset = nullptr) const {
return FExpr->getLocationOfByte(ByteNo + Offset, SM, Features, Target,
StartToken, StartTokenByteOffset);
}
SourceLocation getBeginLoc() const LLVM_READONLY {
return FExpr->getBeginLoc().getLocWithOffset(Offset);
}
SourceLocation getEndLoc() const LLVM_READONLY { return FExpr->getEndLoc(); }
};
} // namespace
static void CheckFormatString(Sema &S, const FormatStringLiteral *FExpr,
const Expr *OrigFormatExpr,
ArrayRef<const Expr *> Args,
bool HasVAListArg, unsigned format_idx,
unsigned firstDataArg,
Sema::FormatStringType Type,
bool inFunctionCall,
Sema::VariadicCallType CallType,
llvm::SmallBitVector &CheckedVarArgs,
UncoveredArgHandler &UncoveredArg,
bool IgnoreStringsWithoutSpecifiers);
// Determine if an expression is a string literal or constant string.
// If this function returns false on the arguments to a function expecting a
// format string, we will usually need to emit a warning.
// True string literals are then checked by CheckFormatString.
static StringLiteralCheckType
checkFormatStringExpr(Sema &S, const Expr *E, ArrayRef<const Expr *> Args,
bool HasVAListArg, unsigned format_idx,
unsigned firstDataArg, Sema::FormatStringType Type,
Sema::VariadicCallType CallType, bool InFunctionCall,
llvm::SmallBitVector &CheckedVarArgs,
UncoveredArgHandler &UncoveredArg,
llvm::APSInt Offset,
bool IgnoreStringsWithoutSpecifiers = false) {
if (S.isConstantEvaluated())
return SLCT_NotALiteral;
tryAgain:
assert(Offset.isSigned() && "invalid offset");
if (E->isTypeDependent() || E->isValueDependent())
return SLCT_NotALiteral;
E = E->IgnoreParenCasts();
if (E->isNullPointerConstant(S.Context, Expr::NPC_ValueDependentIsNotNull))
// Technically -Wformat-nonliteral does not warn about this case.
// The behavior of printf and friends in this case is implementation
// dependent. Ideally if the format string cannot be null then
// it should have a 'nonnull' attribute in the function prototype.
return SLCT_UncheckedLiteral;
switch (E->getStmtClass()) {
case Stmt::BinaryConditionalOperatorClass:
case Stmt::ConditionalOperatorClass: {
// The expression is a literal if both sub-expressions were, and it was
// completely checked only if both sub-expressions were checked.
const AbstractConditionalOperator *C =
cast<AbstractConditionalOperator>(E);
// Determine whether it is necessary to check both sub-expressions, for
// example, because the condition expression is a constant that can be
// evaluated at compile time.
bool CheckLeft = true, CheckRight = true;
bool Cond;
if (C->getCond()->EvaluateAsBooleanCondition(Cond, S.getASTContext(),
S.isConstantEvaluated())) {
if (Cond)
CheckRight = false;
else
CheckLeft = false;
}
// We need to maintain the offsets for the right and the left hand side
// separately to check if every possible indexed expression is a valid
// string literal. They might have different offsets for different string
// literals in the end.
StringLiteralCheckType Left;
if (!CheckLeft)
Left = SLCT_UncheckedLiteral;
else {
Left = checkFormatStringExpr(S, C->getTrueExpr(), Args,
HasVAListArg, format_idx, firstDataArg,
Type, CallType, InFunctionCall,
CheckedVarArgs, UncoveredArg, Offset,
IgnoreStringsWithoutSpecifiers);
if (Left == SLCT_NotALiteral || !CheckRight) {
return Left;
}
}
StringLiteralCheckType Right = checkFormatStringExpr(
S, C->getFalseExpr(), Args, HasVAListArg, format_idx, firstDataArg,
Type, CallType, InFunctionCall, CheckedVarArgs, UncoveredArg, Offset,
IgnoreStringsWithoutSpecifiers);
return (CheckLeft && Left < Right) ? Left : Right;
}
case Stmt::ImplicitCastExprClass:
E = cast<ImplicitCastExpr>(E)->getSubExpr();
goto tryAgain;
case Stmt::OpaqueValueExprClass:
if (const Expr *src = cast<OpaqueValueExpr>(E)->getSourceExpr()) {
E = src;
goto tryAgain;
}
return SLCT_NotALiteral;
case Stmt::PredefinedExprClass:
// While __func__, etc., are technically not string literals, they
// cannot contain format specifiers and thus are not a security
// liability.
return SLCT_UncheckedLiteral;
case Stmt::DeclRefExprClass: {
const DeclRefExpr *DR = cast<DeclRefExpr>(E);
// As an exception, do not flag errors for variables binding to
// const string literals.
if (const VarDecl *VD = dyn_cast<VarDecl>(DR->getDecl())) {
bool isConstant = false;
QualType T = DR->getType();
if (const ArrayType *AT = S.Context.getAsArrayType(T)) {
isConstant = AT->getElementType().isConstant(S.Context);
} else if (const PointerType *PT = T->getAs<PointerType>()) {
isConstant = T.isConstant(S.Context) &&
PT->getPointeeType().isConstant(S.Context);
} else if (T->isObjCObjectPointerType()) {
// In ObjC, there is usually no "const ObjectPointer" type,
// so don't check if the pointee type is constant.
isConstant = T.isConstant(S.Context);
}
if (isConstant) {
if (const Expr *Init = VD->getAnyInitializer()) {
// Look through initializers like const char c[] = { "foo" }
if (const InitListExpr *InitList = dyn_cast<InitListExpr>(Init)) {
if (InitList->isStringLiteralInit())
Init = InitList->getInit(0)->IgnoreParenImpCasts();
}
return checkFormatStringExpr(S, Init, Args,
HasVAListArg, format_idx,
firstDataArg, Type, CallType,
/*InFunctionCall*/ false, CheckedVarArgs,
UncoveredArg, Offset);
}
}
// For vprintf* functions (i.e., HasVAListArg==true), we add a
// special check to see if the format string is a function parameter
// of the function calling the printf function. If the function
// has an attribute indicating it is a printf-like function, then we
// should suppress warnings concerning non-literals being used in a call
// to a vprintf function. For example:
//
// void
// logmessage(char const *fmt __attribute__ (format (printf, 1, 2)), ...){
// va_list ap;
// va_start(ap, fmt);
// vprintf(fmt, ap); // Do NOT emit a warning about "fmt".
// ...
// }
if (HasVAListArg) {
if (const ParmVarDecl *PV = dyn_cast<ParmVarDecl>(VD)) {
if (const NamedDecl *ND = dyn_cast<NamedDecl>(PV->getDeclContext())) {
int PVIndex = PV->getFunctionScopeIndex() + 1;
for (const auto *PVFormat : ND->specific_attrs<FormatAttr>()) {
// adjust for implicit parameter
if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(ND))
if (MD->isInstance())
++PVIndex;
// We also check if the formats are compatible.
// We can't pass a 'scanf' string to a 'printf' function.
if (PVIndex == PVFormat->getFormatIdx() &&
Type == S.GetFormatStringType(PVFormat))
return SLCT_UncheckedLiteral;
}
}
}
}
}
return SLCT_NotALiteral;
}
case Stmt::CallExprClass:
case Stmt::CXXMemberCallExprClass: {
const CallExpr *CE = cast<CallExpr>(E);
if (const NamedDecl *ND = dyn_cast_or_null<NamedDecl>(CE->getCalleeDecl())) {
bool IsFirst = true;
StringLiteralCheckType CommonResult;
for (const auto *FA : ND->specific_attrs<FormatArgAttr>()) {
const Expr *Arg = CE->getArg(FA->getFormatIdx().getASTIndex());
StringLiteralCheckType Result = checkFormatStringExpr(
S, Arg, Args, HasVAListArg, format_idx, firstDataArg, Type,
CallType, InFunctionCall, CheckedVarArgs, UncoveredArg, Offset,
IgnoreStringsWithoutSpecifiers);
if (IsFirst) {
CommonResult = Result;
IsFirst = false;
}
}
if (!IsFirst)
return CommonResult;
if (const auto *FD = dyn_cast<FunctionDecl>(ND)) {
unsigned BuiltinID = FD->getBuiltinID();
if (BuiltinID == Builtin::BI__builtin___CFStringMakeConstantString ||
BuiltinID == Builtin::BI__builtin___NSStringMakeConstantString) {
const Expr *Arg = CE->getArg(0);
return checkFormatStringExpr(S, Arg, Args,
HasVAListArg, format_idx,
firstDataArg, Type, CallType,
InFunctionCall, CheckedVarArgs,
UncoveredArg, Offset,
IgnoreStringsWithoutSpecifiers);
}
}
}
return SLCT_NotALiteral;
}
case Stmt::ObjCMessageExprClass: {
const auto *ME = cast<ObjCMessageExpr>(E);
if (const auto *MD = ME->getMethodDecl()) {
if (const auto *FA = MD->getAttr<FormatArgAttr>()) {
// As a special case heuristic, if we're using the method -[NSBundle
// localizedStringForKey:value:table:], ignore any key strings that lack
// format specifiers. The idea is that if the key doesn't have any
// format specifiers then its probably just a key to map to the
// localized strings. If it does have format specifiers though, then its
// likely that the text of the key is the format string in the
// programmer's language, and should be checked.
const ObjCInterfaceDecl *IFace;
if (MD->isInstanceMethod() && (IFace = MD->getClassInterface()) &&
IFace->getIdentifier()->isStr("NSBundle") &&
MD->getSelector().isKeywordSelector(
{"localizedStringForKey", "value", "table"})) {
IgnoreStringsWithoutSpecifiers = true;
}
const Expr *Arg = ME->getArg(FA->getFormatIdx().getASTIndex());
return checkFormatStringExpr(
S, Arg, Args, HasVAListArg, format_idx, firstDataArg, Type,
CallType, InFunctionCall, CheckedVarArgs, UncoveredArg, Offset,
IgnoreStringsWithoutSpecifiers);
}
}
return SLCT_NotALiteral;
}
case Stmt::ObjCStringLiteralClass:
case Stmt::StringLiteralClass: {
const StringLiteral *StrE = nullptr;
if (const ObjCStringLiteral *ObjCFExpr = dyn_cast<ObjCStringLiteral>(E))
StrE = ObjCFExpr->getString();
else
StrE = cast<StringLiteral>(E);
if (StrE) {
if (Offset.isNegative() || Offset > StrE->getLength()) {
// TODO: It would be better to have an explicit warning for out of
// bounds literals.
return SLCT_NotALiteral;
}
FormatStringLiteral FStr(StrE, Offset.sextOrTrunc(64).getSExtValue());
CheckFormatString(S, &FStr, E, Args, HasVAListArg, format_idx,
firstDataArg, Type, InFunctionCall, CallType,
CheckedVarArgs, UncoveredArg,
IgnoreStringsWithoutSpecifiers);
return SLCT_CheckedLiteral;
}
return SLCT_NotALiteral;
}
case Stmt::BinaryOperatorClass: {
const BinaryOperator *BinOp = cast<BinaryOperator>(E);
// A string literal + an int offset is still a string literal.
if (BinOp->isAdditiveOp()) {
Expr::EvalResult LResult, RResult;
bool LIsInt = BinOp->getLHS()->EvaluateAsInt(
LResult, S.Context, Expr::SE_NoSideEffects, S.isConstantEvaluated());
bool RIsInt = BinOp->getRHS()->EvaluateAsInt(
RResult, S.Context, Expr::SE_NoSideEffects, S.isConstantEvaluated());
if (LIsInt != RIsInt) {
BinaryOperatorKind BinOpKind = BinOp->getOpcode();
if (LIsInt) {
if (BinOpKind == BO_Add) {
sumOffsets(Offset, LResult.Val.getInt(), BinOpKind, RIsInt);
E = BinOp->getRHS();
goto tryAgain;
}
} else {
sumOffsets(Offset, RResult.Val.getInt(), BinOpKind, RIsInt);
E = BinOp->getLHS();
goto tryAgain;
}
}
}
return SLCT_NotALiteral;
}
case Stmt::UnaryOperatorClass: {
const UnaryOperator *UnaOp = cast<UnaryOperator>(E);
auto ASE = dyn_cast<ArraySubscriptExpr>(UnaOp->getSubExpr());
if (UnaOp->getOpcode() == UO_AddrOf && ASE) {
Expr::EvalResult IndexResult;
if (ASE->getRHS()->EvaluateAsInt(IndexResult, S.Context,
Expr::SE_NoSideEffects,
S.isConstantEvaluated())) {
sumOffsets(Offset, IndexResult.Val.getInt(), BO_Add,
/*RHS is int*/ true);
E = ASE->getBase();
goto tryAgain;
}
}
return SLCT_NotALiteral;
}
default:
return SLCT_NotALiteral;
}
}
Sema::FormatStringType Sema::GetFormatStringType(const FormatAttr *Format) {
return llvm::StringSwitch<FormatStringType>(Format->getType()->getName())
.Case("scanf", FST_Scanf)
.Cases("printf", "printf0", FST_Printf)
.Cases("NSString", "CFString", FST_NSString)
.Case("strftime", FST_Strftime)
.Case("strfmon", FST_Strfmon)
.Cases("kprintf", "cmn_err", "vcmn_err", "zcmn_err", FST_Kprintf)
.Case("freebsd_kprintf", FST_FreeBSDKPrintf)
.Case("os_trace", FST_OSLog)
.Case("os_log", FST_OSLog)
.Default(FST_Unknown);
}
/// CheckFormatArguments - Check calls to printf and scanf (and similar
/// functions) for correct use of format strings.
/// Returns true if a format string has been fully checked.
bool Sema::CheckFormatArguments(const FormatAttr *Format,
ArrayRef<const Expr *> Args,
bool IsCXXMember,
VariadicCallType CallType,
SourceLocation Loc, SourceRange Range,
llvm::SmallBitVector &CheckedVarArgs) {
FormatStringInfo FSI;
if (getFormatStringInfo(Format, IsCXXMember, &FSI))
return CheckFormatArguments(Args, FSI.HasVAListArg, FSI.FormatIdx,
FSI.FirstDataArg, GetFormatStringType(Format),
CallType, Loc, Range, CheckedVarArgs);
return false;
}
bool Sema::CheckFormatArguments(ArrayRef<const Expr *> Args,
bool HasVAListArg, unsigned format_idx,
unsigned firstDataArg, FormatStringType Type,
VariadicCallType CallType,
SourceLocation Loc, SourceRange Range,
llvm::SmallBitVector &CheckedVarArgs) {
// CHECK: printf/scanf-like function is called with no format string.
if (format_idx >= Args.size()) {
Diag(Loc, diag::warn_missing_format_string) << Range;
return false;
}
const Expr *OrigFormatExpr = Args[format_idx]->IgnoreParenCasts();
// CHECK: format string is not a string literal.
//
// Dynamically generated format strings are difficult to
// automatically vet at compile time. Requiring that format strings
// are string literals: (1) permits the checking of format strings by
// the compiler and thereby (2) can practically remove the source of
// many format string exploits.
// Format string can be either ObjC string (e.g. @"%d") or
// C string (e.g. "%d")
// ObjC string uses the same format specifiers as C string, so we can use
// the same format string checking logic for both ObjC and C strings.
UncoveredArgHandler UncoveredArg;
StringLiteralCheckType CT =
checkFormatStringExpr(*this, OrigFormatExpr, Args, HasVAListArg,
format_idx, firstDataArg, Type, CallType,
/*IsFunctionCall*/ true, CheckedVarArgs,
UncoveredArg,
/*no string offset*/ llvm::APSInt(64, false) = 0);
// Generate a diagnostic where an uncovered argument is detected.
if (UncoveredArg.hasUncoveredArg()) {
unsigned ArgIdx = UncoveredArg.getUncoveredArg() + firstDataArg;
assert(ArgIdx < Args.size() && "ArgIdx outside bounds");
UncoveredArg.Diagnose(*this, /*IsFunctionCall*/true, Args[ArgIdx]);
}
if (CT != SLCT_NotALiteral)
// Literal format string found, check done!
return CT == SLCT_CheckedLiteral;
// Strftime is particular as it always uses a single 'time' argument,
// so it is safe to pass a non-literal string.
if (Type == FST_Strftime)
return false;
// Do not emit diag when the string param is a macro expansion and the
// format is either NSString or CFString. This is a hack to prevent
// diag when using the NSLocalizedString and CFCopyLocalizedString macros
// which are usually used in place of NS and CF string literals.
SourceLocation FormatLoc = Args[format_idx]->getBeginLoc();
if (Type == FST_NSString && SourceMgr.isInSystemMacro(FormatLoc))
return false;
// If there are no arguments specified, warn with -Wformat-security, otherwise
// warn only with -Wformat-nonliteral.
if (Args.size() == firstDataArg) {
Diag(FormatLoc, diag::warn_format_nonliteral_noargs)
<< OrigFormatExpr->getSourceRange();
switch (Type) {
default:
break;
case FST_Kprintf:
case FST_FreeBSDKPrintf:
case FST_Printf:
Diag(FormatLoc, diag::note_format_security_fixit)
<< FixItHint::CreateInsertion(FormatLoc, "\"%s\", ");
break;
case FST_NSString:
Diag(FormatLoc, diag::note_format_security_fixit)
<< FixItHint::CreateInsertion(FormatLoc, "@\"%@\", ");
break;
}
} else {
Diag(FormatLoc, diag::warn_format_nonliteral)
<< OrigFormatExpr->getSourceRange();
}
return false;
}
namespace {
class CheckFormatHandler : public analyze_format_string::FormatStringHandler {
protected:
Sema &S;
const FormatStringLiteral *FExpr;
const Expr *OrigFormatExpr;
const Sema::FormatStringType FSType;
const unsigned FirstDataArg;
const unsigned NumDataArgs;
const char *Beg; // Start of format string.
const bool HasVAListArg;
ArrayRef<const Expr *> Args;
unsigned FormatIdx;
llvm::SmallBitVector CoveredArgs;
bool usesPositionalArgs = false;
bool atFirstArg = true;
bool inFunctionCall;
Sema::VariadicCallType CallType;
llvm::SmallBitVector &CheckedVarArgs;
UncoveredArgHandler &UncoveredArg;
public:
CheckFormatHandler(Sema &s, const FormatStringLiteral *fexpr,
const Expr *origFormatExpr,
const Sema::FormatStringType type, unsigned firstDataArg,
unsigned numDataArgs, const char *beg, bool hasVAListArg,
ArrayRef<const Expr *> Args, unsigned formatIdx,
bool inFunctionCall, Sema::VariadicCallType callType,
llvm::SmallBitVector &CheckedVarArgs,
UncoveredArgHandler &UncoveredArg)
: S(s), FExpr(fexpr), OrigFormatExpr(origFormatExpr), FSType(type),
FirstDataArg(firstDataArg), NumDataArgs(numDataArgs), Beg(beg),
HasVAListArg(hasVAListArg), Args(Args), FormatIdx(formatIdx),
inFunctionCall(inFunctionCall), CallType(callType),
CheckedVarArgs(CheckedVarArgs), UncoveredArg(UncoveredArg) {
CoveredArgs.resize(numDataArgs);
CoveredArgs.reset();
}
void DoneProcessing();
void HandleIncompleteSpecifier(const char *startSpecifier,
unsigned specifierLen) override;
void HandleInvalidLengthModifier(
const analyze_format_string::FormatSpecifier &FS,
const analyze_format_string::ConversionSpecifier &CS,
const char *startSpecifier, unsigned specifierLen,
unsigned DiagID);
void HandleNonStandardLengthModifier(
const analyze_format_string::FormatSpecifier &FS,
const char *startSpecifier, unsigned specifierLen);
void HandleNonStandardConversionSpecifier(
const analyze_format_string::ConversionSpecifier &CS,
const char *startSpecifier, unsigned specifierLen);
void HandlePosition(const char *startPos, unsigned posLen) override;
void HandleInvalidPosition(const char *startSpecifier,
unsigned specifierLen,
analyze_format_string::PositionContext p) override;
void HandleZeroPosition(const char *startPos, unsigned posLen) override;
void HandleNullChar(const char *nullCharacter) override;
template <typename Range>
static void
EmitFormatDiagnostic(Sema &S, bool inFunctionCall, const Expr *ArgumentExpr,
const PartialDiagnostic &PDiag, SourceLocation StringLoc,
bool IsStringLocation, Range StringRange,
ArrayRef<FixItHint> Fixit = None);
protected:
bool HandleInvalidConversionSpecifier(unsigned argIndex, SourceLocation Loc,
const char *startSpec,
unsigned specifierLen,
const char *csStart, unsigned csLen);
void HandlePositionalNonpositionalArgs(SourceLocation Loc,
const char *startSpec,
unsigned specifierLen);
SourceRange getFormatStringRange();
CharSourceRange getSpecifierRange(const char *startSpecifier,
unsigned specifierLen);
SourceLocation getLocationOfByte(const char *x);
const Expr *getDataArg(unsigned i) const;
bool CheckNumArgs(const analyze_format_string::FormatSpecifier &FS,
const analyze_format_string::ConversionSpecifier &CS,
const char *startSpecifier, unsigned specifierLen,
unsigned argIndex);
template <typename Range>
void EmitFormatDiagnostic(PartialDiagnostic PDiag, SourceLocation StringLoc,
bool IsStringLocation, Range StringRange,
ArrayRef<FixItHint> Fixit = None);
};
} // namespace
SourceRange CheckFormatHandler::getFormatStringRange() {
return OrigFormatExpr->getSourceRange();
}
CharSourceRange CheckFormatHandler::
getSpecifierRange(const char *startSpecifier, unsigned specifierLen) {
SourceLocation Start = getLocationOfByte(startSpecifier);
SourceLocation End = getLocationOfByte(startSpecifier + specifierLen - 1);
// Advance the end SourceLocation by one due to half-open ranges.
End = End.getLocWithOffset(1);
return CharSourceRange::getCharRange(Start, End);
}
SourceLocation CheckFormatHandler::getLocationOfByte(const char *x) {
return FExpr->getLocationOfByte(x - Beg, S.getSourceManager(),
S.getLangOpts(), S.Context.getTargetInfo());
}
void CheckFormatHandler::HandleIncompleteSpecifier(const char *startSpecifier,
unsigned specifierLen){
EmitFormatDiagnostic(S.PDiag(diag::warn_printf_incomplete_specifier),
getLocationOfByte(startSpecifier),
/*IsStringLocation*/true,
getSpecifierRange(startSpecifier, specifierLen));
}
void CheckFormatHandler::HandleInvalidLengthModifier(
const analyze_format_string::FormatSpecifier &FS,
const analyze_format_string::ConversionSpecifier &CS,
const char *startSpecifier, unsigned specifierLen, unsigned DiagID) {
using namespace analyze_format_string;
const LengthModifier &LM = FS.getLengthModifier();
CharSourceRange LMRange = getSpecifierRange(LM.getStart(), LM.getLength());
// See if we know how to fix this length modifier.
Optional<LengthModifier> FixedLM = FS.getCorrectedLengthModifier();
if (FixedLM) {
EmitFormatDiagnostic(S.PDiag(DiagID) << LM.toString() << CS.toString(),
getLocationOfByte(LM.getStart()),
/*IsStringLocation*/true,
getSpecifierRange(startSpecifier, specifierLen));
S.Diag(getLocationOfByte(LM.getStart()), diag::note_format_fix_specifier)
<< FixedLM->toString()
<< FixItHint::CreateReplacement(LMRange, FixedLM->toString());
} else {
FixItHint Hint;
if (DiagID == diag::warn_format_nonsensical_length)
Hint = FixItHint::CreateRemoval(LMRange);
EmitFormatDiagnostic(S.PDiag(DiagID) << LM.toString() << CS.toString(),
getLocationOfByte(LM.getStart()),
/*IsStringLocation*/true,
getSpecifierRange(startSpecifier, specifierLen),
Hint);
}
}
void CheckFormatHandler::HandleNonStandardLengthModifier(
const analyze_format_string::FormatSpecifier &FS,
const char *startSpecifier, unsigned specifierLen) {
using namespace analyze_format_string;
const LengthModifier &LM = FS.getLengthModifier();
CharSourceRange LMRange = getSpecifierRange(LM.getStart(), LM.getLength());
// See if we know how to fix this length modifier.
Optional<LengthModifier> FixedLM = FS.getCorrectedLengthModifier();
if (FixedLM) {
EmitFormatDiagnostic(S.PDiag(diag::warn_format_non_standard)
<< LM.toString() << 0,
getLocationOfByte(LM.getStart()),
/*IsStringLocation*/true,
getSpecifierRange(startSpecifier, specifierLen));
S.Diag(getLocationOfByte(LM.getStart()), diag::note_format_fix_specifier)
<< FixedLM->toString()
<< FixItHint::CreateReplacement(LMRange, FixedLM->toString());
} else {
EmitFormatDiagnostic(S.PDiag(diag::warn_format_non_standard)
<< LM.toString() << 0,
getLocationOfByte(LM.getStart()),
/*IsStringLocation*/true,
getSpecifierRange(startSpecifier, specifierLen));
}
}
void CheckFormatHandler::HandleNonStandardConversionSpecifier(
const analyze_format_string::ConversionSpecifier &CS,
const char *startSpecifier, unsigned specifierLen) {
using namespace analyze_format_string;
// See if we know how to fix this conversion specifier.
Optional<ConversionSpecifier> FixedCS = CS.getStandardSpecifier();
if (FixedCS) {
EmitFormatDiagnostic(S.PDiag(diag::warn_format_non_standard)
<< CS.toString() << /*conversion specifier*/1,
getLocationOfByte(CS.getStart()),
/*IsStringLocation*/true,
getSpecifierRange(startSpecifier, specifierLen));
CharSourceRange CSRange = getSpecifierRange(CS.getStart(), CS.getLength());
S.Diag(getLocationOfByte(CS.getStart()), diag::note_format_fix_specifier)
<< FixedCS->toString()
<< FixItHint::CreateReplacement(CSRange, FixedCS->toString());
} else {
EmitFormatDiagnostic(S.PDiag(diag::warn_format_non_standard)
<< CS.toString() << /*conversion specifier*/1,
getLocationOfByte(CS.getStart()),
/*IsStringLocation*/true,
getSpecifierRange(startSpecifier, specifierLen));
}
}
void CheckFormatHandler::HandlePosition(const char *startPos,
unsigned posLen) {
EmitFormatDiagnostic(S.PDiag(diag::warn_format_non_standard_positional_arg),
getLocationOfByte(startPos),
/*IsStringLocation*/true,
getSpecifierRange(startPos, posLen));
}
void
CheckFormatHandler::HandleInvalidPosition(const char *startPos, unsigned posLen,
analyze_format_string::PositionContext p) {
EmitFormatDiagnostic(S.PDiag(diag::warn_format_invalid_positional_specifier)
<< (unsigned) p,
getLocationOfByte(startPos), /*IsStringLocation*/true,
getSpecifierRange(startPos, posLen));
}
void CheckFormatHandler::HandleZeroPosition(const char *startPos,
unsigned posLen) {
EmitFormatDiagnostic(S.PDiag(diag::warn_format_zero_positional_specifier),
getLocationOfByte(startPos),
/*IsStringLocation*/true,
getSpecifierRange(startPos, posLen));
}
void CheckFormatHandler::HandleNullChar(const char *nullCharacter) {
if (!isa<ObjCStringLiteral>(OrigFormatExpr)) {
// The presence of a null character is likely an error.
EmitFormatDiagnostic(
S.PDiag(diag::warn_printf_format_string_contains_null_char),
getLocationOfByte(nullCharacter), /*IsStringLocation*/true,
getFormatStringRange());
}
}
// Note that this may return NULL if there was an error parsing or building
// one of the argument expressions.
const Expr *CheckFormatHandler::getDataArg(unsigned i) const {
return Args[FirstDataArg + i];
}
void CheckFormatHandler::DoneProcessing() {
// Does the number of data arguments exceed the number of
// format conversions in the format string?
if (!HasVAListArg) {
// Find any arguments that weren't covered.
CoveredArgs.flip();
signed notCoveredArg = CoveredArgs.find_first();
if (notCoveredArg >= 0) {
assert((unsigned)notCoveredArg < NumDataArgs);
UncoveredArg.Update(notCoveredArg, OrigFormatExpr);
} else {
UncoveredArg.setAllCovered();
}
}
}
void UncoveredArgHandler::Diagnose(Sema &S, bool IsFunctionCall,
const Expr *ArgExpr) {
assert(hasUncoveredArg() && DiagnosticExprs.size() > 0 &&
"Invalid state");
if (!ArgExpr)
return;
SourceLocation Loc = ArgExpr->getBeginLoc();
if (S.getSourceManager().isInSystemMacro(Loc))
return;
PartialDiagnostic PDiag = S.PDiag(diag::warn_printf_data_arg_not_used);
for (auto E : DiagnosticExprs)
PDiag << E->getSourceRange();
CheckFormatHandler::EmitFormatDiagnostic(
S, IsFunctionCall, DiagnosticExprs[0],
PDiag, Loc, /*IsStringLocation*/false,
DiagnosticExprs[0]->getSourceRange());
}
bool
CheckFormatHandler::HandleInvalidConversionSpecifier(unsigned argIndex,
SourceLocation Loc,
const char *startSpec,
unsigned specifierLen,
const char *csStart,
unsigned csLen) {
bool keepGoing = true;
if (argIndex < NumDataArgs) {
// Consider the argument coverered, even though the specifier doesn't
// make sense.
CoveredArgs.set(argIndex);
}
else {
// If argIndex exceeds the number of data arguments we
// don't issue a warning because that is just a cascade of warnings (and
// they may have intended '%%' anyway). We don't want to continue processing
// the format string after this point, however, as we will like just get
// gibberish when trying to match arguments.
keepGoing = false;
}
StringRef Specifier(csStart, csLen);
// If the specifier in non-printable, it could be the first byte of a UTF-8
// sequence. In that case, print the UTF-8 code point. If not, print the byte
// hex value.
std::string CodePointStr;
if (!llvm::sys::locale::isPrint(*csStart)) {
llvm::UTF32 CodePoint;
const llvm::UTF8 **B = reinterpret_cast<const llvm::UTF8 **>(&csStart);
const llvm::UTF8 *E =
reinterpret_cast<const llvm::UTF8 *>(csStart + csLen);
llvm::ConversionResult Result =
llvm::convertUTF8Sequence(B, E, &CodePoint, llvm::strictConversion);
if (Result != llvm::conversionOK) {
unsigned char FirstChar = *csStart;
CodePoint = (llvm::UTF32)FirstChar;
}
llvm::raw_string_ostream OS(CodePointStr);
if (CodePoint < 256)
OS << "\\x" << llvm::format("%02x", CodePoint);
else if (CodePoint <= 0xFFFF)
OS << "\\u" << llvm::format("%04x", CodePoint);
else
OS << "\\U" << llvm::format("%08x", CodePoint);
OS.flush();
Specifier = CodePointStr;
}
EmitFormatDiagnostic(
S.PDiag(diag::warn_format_invalid_conversion) << Specifier, Loc,
/*IsStringLocation*/ true, getSpecifierRange(startSpec, specifierLen));
return keepGoing;
}
void
CheckFormatHandler::HandlePositionalNonpositionalArgs(SourceLocation Loc,
const char *startSpec,
unsigned specifierLen) {
EmitFormatDiagnostic(
S.PDiag(diag::warn_format_mix_positional_nonpositional_args),
Loc, /*isStringLoc*/true, getSpecifierRange(startSpec, specifierLen));
}
bool
CheckFormatHandler::CheckNumArgs(
const analyze_format_string::FormatSpecifier &FS,
const analyze_format_string::ConversionSpecifier &CS,
const char *startSpecifier, unsigned specifierLen, unsigned argIndex) {
if (argIndex >= NumDataArgs) {
PartialDiagnostic PDiag = FS.usesPositionalArg()
? (S.PDiag(diag::warn_printf_positional_arg_exceeds_data_args)
<< (argIndex+1) << NumDataArgs)
: S.PDiag(diag::warn_printf_insufficient_data_args);
EmitFormatDiagnostic(
PDiag, getLocationOfByte(CS.getStart()), /*IsStringLocation*/true,
getSpecifierRange(startSpecifier, specifierLen));
// Since more arguments than conversion tokens are given, by extension
// all arguments are covered, so mark this as so.
UncoveredArg.setAllCovered();
return false;
}
return true;
}
template<typename Range>
void CheckFormatHandler::EmitFormatDiagnostic(PartialDiagnostic PDiag,
SourceLocation Loc,
bool IsStringLocation,
Range StringRange,
ArrayRef<FixItHint> FixIt) {
EmitFormatDiagnostic(S, inFunctionCall, Args[FormatIdx], PDiag,
Loc, IsStringLocation, StringRange, FixIt);
}
/// If the format string is not within the function call, emit a note
/// so that the function call and string are in diagnostic messages.
///
/// \param InFunctionCall if true, the format string is within the function
/// call and only one diagnostic message will be produced. Otherwise, an
/// extra note will be emitted pointing to location of the format string.
///
/// \param ArgumentExpr the expression that is passed as the format string
/// argument in the function call. Used for getting locations when two
/// diagnostics are emitted.
///
/// \param PDiag the callee should already have provided any strings for the
/// diagnostic message. This function only adds locations and fixits
/// to diagnostics.
///
/// \param Loc primary location for diagnostic. If two diagnostics are
/// required, one will be at Loc and a new SourceLocation will be created for
/// the other one.
///
/// \param IsStringLocation if true, Loc points to the format string should be
/// used for the note. Otherwise, Loc points to the argument list and will
/// be used with PDiag.
///
/// \param StringRange some or all of the string to highlight. This is
/// templated so it can accept either a CharSourceRange or a SourceRange.
///
/// \param FixIt optional fix it hint for the format string.
template <typename Range>
void CheckFormatHandler::EmitFormatDiagnostic(
Sema &S, bool InFunctionCall, const Expr *ArgumentExpr,
const PartialDiagnostic &PDiag, SourceLocation Loc, bool IsStringLocation,
Range StringRange, ArrayRef<FixItHint> FixIt) {
if (InFunctionCall) {
const Sema::SemaDiagnosticBuilder &D = S.Diag(Loc, PDiag);
D << StringRange;
D << FixIt;
} else {
S.Diag(IsStringLocation ? ArgumentExpr->getExprLoc() : Loc, PDiag)
<< ArgumentExpr->getSourceRange();
const Sema::SemaDiagnosticBuilder &Note =
S.Diag(IsStringLocation ? Loc : StringRange.getBegin(),
diag::note_format_string_defined);
Note << StringRange;
Note << FixIt;
}
}
//===--- CHECK: Printf format string checking ------------------------------===//
namespace {
class CheckPrintfHandler : public CheckFormatHandler {
public:
CheckPrintfHandler(Sema &s, const FormatStringLiteral *fexpr,
const Expr *origFormatExpr,
const Sema::FormatStringType type, unsigned firstDataArg,
unsigned numDataArgs, bool isObjC, const char *beg,
bool hasVAListArg, ArrayRef<const Expr *> Args,
unsigned formatIdx, bool inFunctionCall,
Sema::VariadicCallType CallType,
llvm::SmallBitVector &CheckedVarArgs,
UncoveredArgHandler &UncoveredArg)
: CheckFormatHandler(s, fexpr, origFormatExpr, type, firstDataArg,
numDataArgs, beg, hasVAListArg, Args, formatIdx,
inFunctionCall, CallType, CheckedVarArgs,
UncoveredArg) {}
bool isObjCContext() const { return FSType == Sema::FST_NSString; }
/// Returns true if '%@' specifiers are allowed in the format string.
bool allowsObjCArg() const {
return FSType == Sema::FST_NSString || FSType == Sema::FST_OSLog ||
FSType == Sema::FST_OSTrace;
}
bool HandleInvalidPrintfConversionSpecifier(
const analyze_printf::PrintfSpecifier &FS,
const char *startSpecifier,
unsigned specifierLen) override;
void handleInvalidMaskType(StringRef MaskType) override;
bool HandlePrintfSpecifier(const analyze_printf::PrintfSpecifier &FS,
const char *startSpecifier,
unsigned specifierLen) override;
bool checkFormatExpr(const analyze_printf::PrintfSpecifier &FS,
const char *StartSpecifier,
unsigned SpecifierLen,
const Expr *E);
bool HandleAmount(const analyze_format_string::OptionalAmount &Amt, unsigned k,
const char *startSpecifier, unsigned specifierLen);
void HandleInvalidAmount(const analyze_printf::PrintfSpecifier &FS,
const analyze_printf::OptionalAmount &Amt,
unsigned type,
const char *startSpecifier, unsigned specifierLen);
void HandleFlag(const analyze_printf::PrintfSpecifier &FS,
const analyze_printf::OptionalFlag &flag,
const char *startSpecifier, unsigned specifierLen);
void HandleIgnoredFlag(const analyze_printf::PrintfSpecifier &FS,
const analyze_printf::OptionalFlag &ignoredFlag,
const analyze_printf::OptionalFlag &flag,
const char *startSpecifier, unsigned specifierLen);
bool checkForCStrMembers(const analyze_printf::ArgType &AT,
const Expr *E);
void HandleEmptyObjCModifierFlag(const char *startFlag,
unsigned flagLen) override;
void HandleInvalidObjCModifierFlag(const char *startFlag,
unsigned flagLen) override;
void HandleObjCFlagsWithNonObjCConversion(const char *flagsStart,
const char *flagsEnd,
const char *conversionPosition)
override;
};
} // namespace
bool CheckPrintfHandler::HandleInvalidPrintfConversionSpecifier(
const analyze_printf::PrintfSpecifier &FS,
const char *startSpecifier,
unsigned specifierLen) {
const analyze_printf::PrintfConversionSpecifier &CS =
FS.getConversionSpecifier();
return HandleInvalidConversionSpecifier(FS.getArgIndex(),
getLocationOfByte(CS.getStart()),
startSpecifier, specifierLen,
CS.getStart(), CS.getLength());
}
void CheckPrintfHandler::handleInvalidMaskType(StringRef MaskType) {
S.Diag(getLocationOfByte(MaskType.data()), diag::err_invalid_mask_type_size);
}
bool CheckPrintfHandler::HandleAmount(
const analyze_format_string::OptionalAmount &Amt,
unsigned k, const char *startSpecifier,
unsigned specifierLen) {
if (Amt.hasDataArgument()) {
if (!HasVAListArg) {
unsigned argIndex = Amt.getArgIndex();
if (argIndex >= NumDataArgs) {
EmitFormatDiagnostic(S.PDiag(diag::warn_printf_asterisk_missing_arg)
<< k,
getLocationOfByte(Amt.getStart()),
/*IsStringLocation*/true,
getSpecifierRange(startSpecifier, specifierLen));
// Don't do any more checking. We will just emit
// spurious errors.
return false;
}
// Type check the data argument. It should be an 'int'.
// Although not in conformance with C99, we also allow the argument to be
// an 'unsigned int' as that is a reasonably safe case. GCC also
// doesn't emit a warning for that case.
CoveredArgs.set(argIndex);
const Expr *Arg = getDataArg(argIndex);
if (!Arg)
return false;
QualType T = Arg->getType();
const analyze_printf::ArgType &AT = Amt.getArgType(S.Context);
assert(AT.isValid());
if (!AT.matchesType(S.Context, T)) {
EmitFormatDiagnostic(S.PDiag(diag::warn_printf_asterisk_wrong_type)
<< k << AT.getRepresentativeTypeName(S.Context)
<< T << Arg->getSourceRange(),
getLocationOfByte(Amt.getStart()),
/*IsStringLocation*/true,
getSpecifierRange(startSpecifier, specifierLen));
// Don't do any more checking. We will just emit
// spurious errors.
return false;
}
}
}
return true;
}
void CheckPrintfHandler::HandleInvalidAmount(
const analyze_printf::PrintfSpecifier &FS,
const analyze_printf::OptionalAmount &Amt,
unsigned type,
const char *startSpecifier,
unsigned specifierLen) {
const analyze_printf::PrintfConversionSpecifier &CS =
FS.getConversionSpecifier();
FixItHint fixit =
Amt.getHowSpecified() == analyze_printf::OptionalAmount::Constant
? FixItHint::CreateRemoval(getSpecifierRange(Amt.getStart(),
Amt.getConstantLength()))
: FixItHint();
EmitFormatDiagnostic(S.PDiag(diag::warn_printf_nonsensical_optional_amount)
<< type << CS.toString(),
getLocationOfByte(Amt.getStart()),
/*IsStringLocation*/true,
getSpecifierRange(startSpecifier, specifierLen),
fixit);
}
void CheckPrintfHandler::HandleFlag(const analyze_printf::PrintfSpecifier &FS,
const analyze_printf::OptionalFlag &flag,
const char *startSpecifier,
unsigned specifierLen) {
// Warn about pointless flag with a fixit removal.
const analyze_printf::PrintfConversionSpecifier &CS =
FS.getConversionSpecifier();
EmitFormatDiagnostic(S.PDiag(diag::warn_printf_nonsensical_flag)
<< flag.toString() << CS.toString(),
getLocationOfByte(flag.getPosition()),
/*IsStringLocation*/true,
getSpecifierRange(startSpecifier, specifierLen),
FixItHint::CreateRemoval(
getSpecifierRange(flag.getPosition(), 1)));
}
void CheckPrintfHandler::HandleIgnoredFlag(
const analyze_printf::PrintfSpecifier &FS,
const analyze_printf::OptionalFlag &ignoredFlag,
const analyze_printf::OptionalFlag &flag,
const char *startSpecifier,
unsigned specifierLen) {
// Warn about ignored flag with a fixit removal.
EmitFormatDiagnostic(S.PDiag(diag::warn_printf_ignored_flag)
<< ignoredFlag.toString() << flag.toString(),
getLocationOfByte(ignoredFlag.getPosition()),
/*IsStringLocation*/true,
getSpecifierRange(startSpecifier, specifierLen),
FixItHint::CreateRemoval(
getSpecifierRange(ignoredFlag.getPosition(), 1)));
}
void CheckPrintfHandler::HandleEmptyObjCModifierFlag(const char *startFlag,
unsigned flagLen) {
// Warn about an empty flag.
EmitFormatDiagnostic(S.PDiag(diag::warn_printf_empty_objc_flag),
getLocationOfByte(startFlag),
/*IsStringLocation*/true,
getSpecifierRange(startFlag, flagLen));
}
void CheckPrintfHandler::HandleInvalidObjCModifierFlag(const char *startFlag,
unsigned flagLen) {
// Warn about an invalid flag.
auto Range = getSpecifierRange(startFlag, flagLen);
StringRef flag(startFlag, flagLen);
EmitFormatDiagnostic(S.PDiag(diag::warn_printf_invalid_objc_flag) << flag,
getLocationOfByte(startFlag),
/*IsStringLocation*/true,
Range, FixItHint::CreateRemoval(Range));
}
void CheckPrintfHandler::HandleObjCFlagsWithNonObjCConversion(
const char *flagsStart, const char *flagsEnd, const char *conversionPosition) {
// Warn about using '[...]' without a '@' conversion.
auto Range = getSpecifierRange(flagsStart, flagsEnd - flagsStart + 1);
auto diag = diag::warn_printf_ObjCflags_without_ObjCConversion;
EmitFormatDiagnostic(S.PDiag(diag) << StringRef(conversionPosition, 1),
getLocationOfByte(conversionPosition),
/*IsStringLocation*/true,
Range, FixItHint::CreateRemoval(Range));
}
// Determines if the specified is a C++ class or struct containing
// a member with the specified name and kind (e.g. a CXXMethodDecl named
// "c_str()").
template<typename MemberKind>
static llvm::SmallPtrSet<MemberKind*, 1>
CXXRecordMembersNamed(StringRef Name, Sema &S, QualType Ty) {
const RecordType *RT = Ty->getAs<RecordType>();
llvm::SmallPtrSet<MemberKind*, 1> Results;
if (!RT)
return Results;
const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(RT->getDecl());
if (!RD || !RD->getDefinition())
return Results;
LookupResult R(S, &S.Context.Idents.get(Name), SourceLocation(),
Sema::LookupMemberName);
R.suppressDiagnostics();
// We just need to include all members of the right kind turned up by the
// filter, at this point.
if (S.LookupQualifiedName(R, RT->getDecl()))
for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) {
NamedDecl *decl = (*I)->getUnderlyingDecl();
if (MemberKind *FK = dyn_cast<MemberKind>(decl))
Results.insert(FK);
}
return Results;
}
/// Check if we could call '.c_str()' on an object.
///
/// FIXME: This returns the wrong results in some cases (if cv-qualifiers don't
/// allow the call, or if it would be ambiguous).
bool Sema::hasCStrMethod(const Expr *E) {
using MethodSet = llvm::SmallPtrSet<CXXMethodDecl *, 1>;
MethodSet Results =
CXXRecordMembersNamed<CXXMethodDecl>("c_str", *this, E->getType());
for (MethodSet::iterator MI = Results.begin(), ME = Results.end();
MI != ME; ++MI)
if ((*MI)->getMinRequiredArguments() == 0)
return true;
return false;
}
// Check if a (w)string was passed when a (w)char* was needed, and offer a
// better diagnostic if so. AT is assumed to be valid.
// Returns true when a c_str() conversion method is found.
bool CheckPrintfHandler::checkForCStrMembers(
const analyze_printf::ArgType &AT, const Expr *E) {
using MethodSet = llvm::SmallPtrSet<CXXMethodDecl *, 1>;
MethodSet Results =
CXXRecordMembersNamed<CXXMethodDecl>("c_str", S, E->getType());
for (MethodSet::iterator MI = Results.begin(), ME = Results.end();
MI != ME; ++MI) {
const CXXMethodDecl *Method = *MI;
if (Method->getMinRequiredArguments() == 0 &&
AT.matchesType(S.Context, Method->getReturnType())) {
// FIXME: Suggest parens if the expression needs them.
SourceLocation EndLoc = S.getLocForEndOfToken(E->getEndLoc());
S.Diag(E->getBeginLoc(), diag::note_printf_c_str)
<< "c_str()" << FixItHint::CreateInsertion(EndLoc, ".c_str()");
return true;
}
}
return false;
}
bool
CheckPrintfHandler::HandlePrintfSpecifier(const analyze_printf::PrintfSpecifier
&FS,
const char *startSpecifier,
unsigned specifierLen) {
using namespace analyze_format_string;
using namespace analyze_printf;
const PrintfConversionSpecifier &CS = FS.getConversionSpecifier();
if (FS.consumesDataArgument()) {
if (atFirstArg) {
atFirstArg = false;
usesPositionalArgs = FS.usesPositionalArg();
}
else if (usesPositionalArgs != FS.usesPositionalArg()) {
HandlePositionalNonpositionalArgs(getLocationOfByte(CS.getStart()),
startSpecifier, specifierLen);
return false;
}
}
// First check if the field width, precision, and conversion specifier
// have matching data arguments.
if (!HandleAmount(FS.getFieldWidth(), /* field width */ 0,
startSpecifier, specifierLen)) {
return false;
}
if (!HandleAmount(FS.getPrecision(), /* precision */ 1,
startSpecifier, specifierLen)) {
return false;
}
if (!CS.consumesDataArgument()) {
// FIXME: Technically specifying a precision or field width here
// makes no sense. Worth issuing a warning at some point.
return true;
}
// Consume the argument.
unsigned argIndex = FS.getArgIndex();
if (argIndex < NumDataArgs) {
// The check to see if the argIndex is valid will come later.
// We set the bit here because we may exit early from this
// function if we encounter some other error.
CoveredArgs.set(argIndex);
}
// FreeBSD kernel extensions.
if (CS.getKind() == ConversionSpecifier::FreeBSDbArg ||
CS.getKind() == ConversionSpecifier::FreeBSDDArg) {
// We need at least two arguments.
if (!CheckNumArgs(FS, CS, startSpecifier, specifierLen, argIndex + 1))
return false;
// Claim the second argument.
CoveredArgs.set(argIndex + 1);
// Type check the first argument (int for %b, pointer for %D)
const Expr *Ex = getDataArg(argIndex);
const analyze_printf::ArgType &AT =
(CS.getKind() == ConversionSpecifier::FreeBSDbArg) ?
ArgType(S.Context.IntTy) : ArgType::CPointerTy;
if (AT.isValid() && !AT.matchesType(S.Context, Ex->getType()))
EmitFormatDiagnostic(
S.PDiag(diag::warn_format_conversion_argument_type_mismatch)
<< AT.getRepresentativeTypeName(S.Context) << Ex->getType()
<< false << Ex->getSourceRange(),
Ex->getBeginLoc(), /*IsStringLocation*/ false,
getSpecifierRange(startSpecifier, specifierLen));
// Type check the second argument (char * for both %b and %D)
Ex = getDataArg(argIndex + 1);
const analyze_printf::ArgType &AT2 = ArgType::CStrTy;
if (AT2.isValid() && !AT2.matchesType(S.Context, Ex->getType()))
EmitFormatDiagnostic(
S.PDiag(diag::warn_format_conversion_argument_type_mismatch)
<< AT2.getRepresentativeTypeName(S.Context) << Ex->getType()
<< false << Ex->getSourceRange(),
Ex->getBeginLoc(), /*IsStringLocation*/ false,
getSpecifierRange(startSpecifier, specifierLen));
return true;
}
// Check for using an Objective-C specific conversion specifier
// in a non-ObjC literal.
if (!allowsObjCArg() && CS.isObjCArg()) {
return HandleInvalidPrintfConversionSpecifier(FS, startSpecifier,
specifierLen);
}
// %P can only be used with os_log.
if (FSType != Sema::FST_OSLog && CS.getKind() == ConversionSpecifier::PArg) {
return HandleInvalidPrintfConversionSpecifier(FS, startSpecifier,
specifierLen);
}
// %n is not allowed with os_log.
if (FSType == Sema::FST_OSLog && CS.getKind() == ConversionSpecifier::nArg) {
EmitFormatDiagnostic(S.PDiag(diag::warn_os_log_format_narg),
getLocationOfByte(CS.getStart()),
/*IsStringLocation*/ false,
getSpecifierRange(startSpecifier, specifierLen));
return true;
}
// Only scalars are allowed for os_trace.
if (FSType == Sema::FST_OSTrace &&
(CS.getKind() == ConversionSpecifier::PArg ||
CS.getKind() == ConversionSpecifier::sArg ||
CS.getKind() == ConversionSpecifier::ObjCObjArg)) {
return HandleInvalidPrintfConversionSpecifier(FS, startSpecifier,
specifierLen);
}
// Check for use of public/private annotation outside of os_log().
if (FSType != Sema::FST_OSLog) {
if (FS.isPublic().isSet()) {
EmitFormatDiagnostic(S.PDiag(diag::warn_format_invalid_annotation)
<< "public",
getLocationOfByte(FS.isPublic().getPosition()),
/*IsStringLocation*/ false,
getSpecifierRange(startSpecifier, specifierLen));
}
if (FS.isPrivate().isSet()) {
EmitFormatDiagnostic(S.PDiag(diag::warn_format_invalid_annotation)
<< "private",
getLocationOfByte(FS.isPrivate().getPosition()),
/*IsStringLocation*/ false,
getSpecifierRange(startSpecifier, specifierLen));
}
}
// Check for invalid use of field width
if (!FS.hasValidFieldWidth()) {
HandleInvalidAmount(FS, FS.getFieldWidth(), /* field width */ 0,
startSpecifier, specifierLen);
}
// Check for invalid use of precision
if (!FS.hasValidPrecision()) {
HandleInvalidAmount(FS, FS.getPrecision(), /* precision */ 1,
startSpecifier, specifierLen);
}
// Precision is mandatory for %P specifier.
if (CS.getKind() == ConversionSpecifier::PArg &&
FS.getPrecision().getHowSpecified() == OptionalAmount::NotSpecified) {
EmitFormatDiagnostic(S.PDiag(diag::warn_format_P_no_precision),
getLocationOfByte(startSpecifier),
/*IsStringLocation*/ false,
getSpecifierRange(startSpecifier, specifierLen));
}
// Check each flag does not conflict with any other component.
if (!FS.hasValidThousandsGroupingPrefix())
HandleFlag(FS, FS.hasThousandsGrouping(), startSpecifier, specifierLen);
if (!FS.hasValidLeadingZeros())
HandleFlag(FS, FS.hasLeadingZeros(), startSpecifier, specifierLen);
if (!FS.hasValidPlusPrefix())
HandleFlag(FS, FS.hasPlusPrefix(), startSpecifier, specifierLen);
if (!FS.hasValidSpacePrefix())
HandleFlag(FS, FS.hasSpacePrefix(), startSpecifier, specifierLen);
if (!FS.hasValidAlternativeForm())
HandleFlag(FS, FS.hasAlternativeForm(), startSpecifier, specifierLen);
if (!FS.hasValidLeftJustified())
HandleFlag(FS, FS.isLeftJustified(), startSpecifier, specifierLen);
// Check that flags are not ignored by another flag
if (FS.hasSpacePrefix() && FS.hasPlusPrefix()) // ' ' ignored by '+'
HandleIgnoredFlag(FS, FS.hasSpacePrefix(), FS.hasPlusPrefix(),
startSpecifier, specifierLen);
if (FS.hasLeadingZeros() && FS.isLeftJustified()) // '0' ignored by '-'
HandleIgnoredFlag(FS, FS.hasLeadingZeros(), FS.isLeftJustified(),
startSpecifier, specifierLen);
// Check the length modifier is valid with the given conversion specifier.
if (!FS.hasValidLengthModifier(S.getASTContext().getTargetInfo(),
S.getLangOpts()))
HandleInvalidLengthModifier(FS, CS, startSpecifier, specifierLen,
diag::warn_format_nonsensical_length);
else if (!FS.hasStandardLengthModifier())
HandleNonStandardLengthModifier(FS, startSpecifier, specifierLen);
else if (!FS.hasStandardLengthConversionCombination())
HandleInvalidLengthModifier(FS, CS, startSpecifier, specifierLen,
diag::warn_format_non_standard_conversion_spec);
if (!FS.hasStandardConversionSpecifier(S.getLangOpts()))
HandleNonStandardConversionSpecifier(CS, startSpecifier, specifierLen);
// The remaining checks depend on the data arguments.
if (HasVAListArg)
return true;
if (!CheckNumArgs(FS, CS, startSpecifier, specifierLen, argIndex))
return false;
const Expr *Arg = getDataArg(argIndex);
if (!Arg)
return true;
return checkFormatExpr(FS, startSpecifier, specifierLen, Arg);
}
static bool requiresParensToAddCast(const Expr *E) {
// FIXME: We should have a general way to reason about operator
// precedence and whether parens are actually needed here.
// Take care of a few common cases where they aren't.
const Expr *Inside = E->IgnoreImpCasts();
if (const PseudoObjectExpr *POE = dyn_cast<PseudoObjectExpr>(Inside))
Inside = POE->getSyntacticForm()->IgnoreImpCasts();
switch (Inside->getStmtClass()) {
case Stmt::ArraySubscriptExprClass:
case Stmt::CallExprClass:
case Stmt::CharacterLiteralClass:
case Stmt::CXXBoolLiteralExprClass:
case Stmt::DeclRefExprClass:
case Stmt::FloatingLiteralClass:
case Stmt::IntegerLiteralClass:
case Stmt::MemberExprClass:
case Stmt::ObjCArrayLiteralClass:
case Stmt::ObjCBoolLiteralExprClass:
case Stmt::ObjCBoxedExprClass:
case Stmt::ObjCDictionaryLiteralClass:
case Stmt::ObjCEncodeExprClass:
case Stmt::ObjCIvarRefExprClass:
case Stmt::ObjCMessageExprClass:
case Stmt::ObjCPropertyRefExprClass:
case Stmt::ObjCStringLiteralClass:
case Stmt::ObjCSubscriptRefExprClass:
case Stmt::ParenExprClass:
case Stmt::StringLiteralClass:
case Stmt::UnaryOperatorClass:
return false;
default:
return true;
}
}
static std::pair<QualType, StringRef>
shouldNotPrintDirectly(const ASTContext &Context,
QualType IntendedTy,
const Expr *E) {
// Use a 'while' to peel off layers of typedefs.
QualType TyTy = IntendedTy;
while (const TypedefType *UserTy = TyTy->getAs<TypedefType>()) {
StringRef Name = UserTy->getDecl()->getName();
QualType CastTy = llvm::StringSwitch<QualType>(Name)
.Case("CFIndex", Context.getNSIntegerType())
.Case("NSInteger", Context.getNSIntegerType())
.Case("NSUInteger", Context.getNSUIntegerType())
.Case("SInt32", Context.IntTy)
.Case("UInt32", Context.UnsignedIntTy)
.Default(QualType());
if (!CastTy.isNull())
return std::make_pair(CastTy, Name);
TyTy = UserTy->desugar();
}
// Strip parens if necessary.
if (const ParenExpr *PE = dyn_cast<ParenExpr>(E))
return shouldNotPrintDirectly(Context,
PE->getSubExpr()->getType(),
PE->getSubExpr());
// If this is a conditional expression, then its result type is constructed
// via usual arithmetic conversions and thus there might be no necessary
// typedef sugar there. Recurse to operands to check for NSInteger &
// Co. usage condition.
if (const ConditionalOperator *CO = dyn_cast<ConditionalOperator>(E)) {
QualType TrueTy, FalseTy;
StringRef TrueName, FalseName;
std::tie(TrueTy, TrueName) =
shouldNotPrintDirectly(Context,
CO->getTrueExpr()->getType(),
CO->getTrueExpr());
std::tie(FalseTy, FalseName) =
shouldNotPrintDirectly(Context,
CO->getFalseExpr()->getType(),
CO->getFalseExpr());
if (TrueTy == FalseTy)
return std::make_pair(TrueTy, TrueName);
else if (TrueTy.isNull())
return std::make_pair(FalseTy, FalseName);
else if (FalseTy.isNull())
return std::make_pair(TrueTy, TrueName);
}
return std::make_pair(QualType(), StringRef());
}
/// Return true if \p ICE is an implicit argument promotion of an arithmetic
/// type. Bit-field 'promotions' from a higher ranked type to a lower ranked
/// type do not count.
static bool
isArithmeticArgumentPromotion(Sema &S, const ImplicitCastExpr *ICE) {
QualType From = ICE->getSubExpr()->getType();
QualType To = ICE->getType();
// It's an integer promotion if the destination type is the promoted
// source type.
if (ICE->getCastKind() == CK_IntegralCast &&
From->isPromotableIntegerType() &&
S.Context.getPromotedIntegerType(From) == To)
return true;
// Look through vector types, since we do default argument promotion for
// those in OpenCL.
if (const auto *VecTy = From->getAs<ExtVectorType>())
From = VecTy->getElementType();
if (const auto *VecTy = To->getAs<ExtVectorType>())
To = VecTy->getElementType();
// It's a floating promotion if the source type is a lower rank.
return ICE->getCastKind() == CK_FloatingCast &&
S.Context.getFloatingTypeOrder(From, To) < 0;
}
bool
CheckPrintfHandler::checkFormatExpr(const analyze_printf::PrintfSpecifier &FS,
const char *StartSpecifier,
unsigned SpecifierLen,
const Expr *E) {
using namespace analyze_format_string;
using namespace analyze_printf;
// Now type check the data expression that matches the
// format specifier.
const analyze_printf::ArgType &AT = FS.getArgType(S.Context, isObjCContext());
if (!AT.isValid())
return true;
QualType ExprTy = E->getType();
while (const TypeOfExprType *TET = dyn_cast<TypeOfExprType>(ExprTy)) {
ExprTy = TET->getUnderlyingExpr()->getType();
}
// Diagnose attempts to print a boolean value as a character. Unlike other
// -Wformat diagnostics, this is fine from a type perspective, but it still
// doesn't make sense.
if (FS.getConversionSpecifier().getKind() == ConversionSpecifier::cArg &&
E->isKnownToHaveBooleanValue()) {
const CharSourceRange &CSR =
getSpecifierRange(StartSpecifier, SpecifierLen);
SmallString<4> FSString;
llvm::raw_svector_ostream os(FSString);
FS.toString(os);
EmitFormatDiagnostic(S.PDiag(diag::warn_format_bool_as_character)
<< FSString,
E->getExprLoc(), false, CSR);
return true;
}
analyze_printf::ArgType::MatchKind Match = AT.matchesType(S.Context, ExprTy);
if (Match == analyze_printf::ArgType::Match)
return true;
// Look through argument promotions for our error message's reported type.
// This includes the integral and floating promotions, but excludes array
// and function pointer decay (seeing that an argument intended to be a
// string has type 'char [6]' is probably more confusing than 'char *') and
// certain bitfield promotions (bitfields can be 'demoted' to a lesser type).
if (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) {
if (isArithmeticArgumentPromotion(S, ICE)) {
E = ICE->getSubExpr();
ExprTy = E->getType();
// Check if we didn't match because of an implicit cast from a 'char'
// or 'short' to an 'int'. This is done because printf is a varargs
// function.
if (ICE->getType() == S.Context.IntTy ||
ICE->getType() == S.Context.UnsignedIntTy) {
// All further checking is done on the subexpression
const analyze_printf::ArgType::MatchKind ImplicitMatch =
AT.matchesType(S.Context, ExprTy);
if (ImplicitMatch == analyze_printf::ArgType::Match)
return true;
if (ImplicitMatch == ArgType::NoMatchPedantic ||
ImplicitMatch == ArgType::NoMatchTypeConfusion)
Match = ImplicitMatch;
}
}
} else if (const CharacterLiteral *CL = dyn_cast<CharacterLiteral>(E)) {
// Special case for 'a', which has type 'int' in C.
// Note, however, that we do /not/ want to treat multibyte constants like
// 'MooV' as characters! This form is deprecated but still exists.
if (ExprTy == S.Context.IntTy)
if (llvm::isUIntN(S.Context.getCharWidth(), CL->getValue()))
ExprTy = S.Context.CharTy;
}
// Look through enums to their underlying type.
bool IsEnum = false;
if (auto EnumTy = ExprTy->getAs<EnumType>()) {
ExprTy = EnumTy->getDecl()->getIntegerType();
IsEnum = true;
}
// %C in an Objective-C context prints a unichar, not a wchar_t.
// If the argument is an integer of some kind, believe the %C and suggest
// a cast instead of changing the conversion specifier.
QualType IntendedTy = ExprTy;
if (isObjCContext() &&
FS.getConversionSpecifier().getKind() == ConversionSpecifier::CArg) {
if (ExprTy->isIntegralOrUnscopedEnumerationType() &&
!ExprTy->isCharType()) {
// 'unichar' is defined as a typedef of unsigned short, but we should
// prefer using the typedef if it is visible.
IntendedTy = S.Context.UnsignedShortTy;
// While we are here, check if the value is an IntegerLiteral that happens
// to be within the valid range.
if (const IntegerLiteral *IL = dyn_cast<IntegerLiteral>(E)) {
const llvm::APInt &V = IL->getValue();
if (V.getActiveBits() <= S.Context.getTypeSize(IntendedTy))
return true;
}
LookupResult Result(S, &S.Context.Idents.get("unichar"), E->getBeginLoc(),
Sema::LookupOrdinaryName);
if (S.LookupName(Result, S.getCurScope())) {
NamedDecl *ND = Result.getFoundDecl();
if (TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(ND))
if (TD->getUnderlyingType() == IntendedTy)
IntendedTy = S.Context.getTypedefType(TD);
}
}
}
// Special-case some of Darwin's platform-independence types by suggesting
// casts to primitive types that are known to be large enough.
bool ShouldNotPrintDirectly = false; StringRef CastTyName;
if (S.Context.getTargetInfo().getTriple().isOSDarwin()) {
QualType CastTy;
std::tie(CastTy, CastTyName) = shouldNotPrintDirectly(S.Context, IntendedTy, E);
if (!CastTy.isNull()) {
// %zi/%zu and %td/%tu are OK to use for NSInteger/NSUInteger of type int
// (long in ASTContext). Only complain to pedants.
if ((CastTyName == "NSInteger" || CastTyName == "NSUInteger") &&
(AT.isSizeT() || AT.isPtrdiffT()) &&
AT.matchesType(S.Context, CastTy))
Match = ArgType::NoMatchPedantic;
IntendedTy = CastTy;
ShouldNotPrintDirectly = true;
}
}
// We may be able to offer a FixItHint if it is a supported type.
PrintfSpecifier fixedFS = FS;
bool Success =
fixedFS.fixType(IntendedTy, S.getLangOpts(), S.Context, isObjCContext());
if (Success) {
// Get the fix string from the fixed format specifier
SmallString<16> buf;
llvm::raw_svector_ostream os(buf);
fixedFS.toString(os);
CharSourceRange SpecRange = getSpecifierRange(StartSpecifier, SpecifierLen);
if (IntendedTy == ExprTy && !ShouldNotPrintDirectly) {
unsigned Diag;
switch (Match) {
case ArgType::Match: llvm_unreachable("expected non-matching");
case ArgType::NoMatchPedantic:
Diag = diag::warn_format_conversion_argument_type_mismatch_pedantic;
break;
case ArgType::NoMatchTypeConfusion:
Diag = diag::warn_format_conversion_argument_type_mismatch_confusion;
break;
case ArgType::NoMatch:
Diag = diag::warn_format_conversion_argument_type_mismatch;
break;
}
// In this case, the specifier is wrong and should be changed to match
// the argument.
EmitFormatDiagnostic(S.PDiag(Diag)
<< AT.getRepresentativeTypeName(S.Context)
<< IntendedTy << IsEnum << E->getSourceRange(),
E->getBeginLoc(),
/*IsStringLocation*/ false, SpecRange,
FixItHint::CreateReplacement(SpecRange, os.str()));
} else {
// The canonical type for formatting this value is different from the
// actual type of the expression. (This occurs, for example, with Darwin's
// NSInteger on 32-bit platforms, where it is typedef'd as 'int', but
// should be printed as 'long' for 64-bit compatibility.)
// Rather than emitting a normal format/argument mismatch, we want to
// add a cast to the recommended type (and correct the format string
// if necessary).
SmallString<16> CastBuf;
llvm::raw_svector_ostream CastFix(CastBuf);
CastFix << "(";
IntendedTy.print(CastFix, S.Context.getPrintingPolicy());
CastFix << ")";
SmallVector<FixItHint,4> Hints;
if (!AT.matchesType(S.Context, IntendedTy) || ShouldNotPrintDirectly)
Hints.push_back(FixItHint::CreateReplacement(SpecRange, os.str()));
if (const CStyleCastExpr *CCast = dyn_cast<CStyleCastExpr>(E)) {
// If there's already a cast present, just replace it.
SourceRange CastRange(CCast->getLParenLoc(), CCast->getRParenLoc());
Hints.push_back(FixItHint::CreateReplacement(CastRange, CastFix.str()));
} else if (!requiresParensToAddCast(E)) {
// If the expression has high enough precedence,
// just write the C-style cast.
Hints.push_back(
FixItHint::CreateInsertion(E->getBeginLoc(), CastFix.str()));
} else {
// Otherwise, add parens around the expression as well as the cast.
CastFix << "(";
Hints.push_back(
FixItHint::CreateInsertion(E->getBeginLoc(), CastFix.str()));
SourceLocation After = S.getLocForEndOfToken(E->getEndLoc());
Hints.push_back(FixItHint::CreateInsertion(After, ")"));
}
if (ShouldNotPrintDirectly) {
// The expression has a type that should not be printed directly.
// We extract the name from the typedef because we don't want to show
// the underlying type in the diagnostic.
StringRef Name;
if (const TypedefType *TypedefTy = dyn_cast<TypedefType>(ExprTy))
Name = TypedefTy->getDecl()->getName();
else
Name = CastTyName;
unsigned Diag = Match == ArgType::NoMatchPedantic
? diag::warn_format_argument_needs_cast_pedantic
: diag::warn_format_argument_needs_cast;
EmitFormatDiagnostic(S.PDiag(Diag) << Name << IntendedTy << IsEnum
<< E->getSourceRange(),
E->getBeginLoc(), /*IsStringLocation=*/false,
SpecRange, Hints);
} else {
// In this case, the expression could be printed using a different
// specifier, but we've decided that the specifier is probably correct
// and we should cast instead. Just use the normal warning message.
EmitFormatDiagnostic(
S.PDiag(diag::warn_format_conversion_argument_type_mismatch)
<< AT.getRepresentativeTypeName(S.Context) << ExprTy << IsEnum
<< E->getSourceRange(),
E->getBeginLoc(), /*IsStringLocation*/ false, SpecRange, Hints);
}
}
} else {
const CharSourceRange &CSR = getSpecifierRange(StartSpecifier,
SpecifierLen);
// Since the warning for passing non-POD types to variadic functions
// was deferred until now, we emit a warning for non-POD
// arguments here.
switch (S.isValidVarArgType(ExprTy)) {
case Sema::VAK_Valid:
case Sema::VAK_ValidInCXX11: {
unsigned Diag;
switch (Match) {
case ArgType::Match: llvm_unreachable("expected non-matching");
case ArgType::NoMatchPedantic:
Diag = diag::warn_format_conversion_argument_type_mismatch_pedantic;
break;
case ArgType::NoMatchTypeConfusion:
Diag = diag::warn_format_conversion_argument_type_mismatch_confusion;
break;
case ArgType::NoMatch:
Diag = diag::warn_format_conversion_argument_type_mismatch;
break;
}
EmitFormatDiagnostic(
S.PDiag(Diag) << AT.getRepresentativeTypeName(S.Context) << ExprTy
<< IsEnum << CSR << E->getSourceRange(),
E->getBeginLoc(), /*IsStringLocation*/ false, CSR);
break;
}
case Sema::VAK_Undefined:
case Sema::VAK_MSVCUndefined:
EmitFormatDiagnostic(S.PDiag(diag::warn_non_pod_vararg_with_format_string)
<< S.getLangOpts().CPlusPlus11 << ExprTy
<< CallType
<< AT.getRepresentativeTypeName(S.Context) << CSR
<< E->getSourceRange(),
E->getBeginLoc(), /*IsStringLocation*/ false, CSR);
checkForCStrMembers(AT, E);
break;
case Sema::VAK_Invalid:
if (ExprTy->isObjCObjectType())
EmitFormatDiagnostic(
S.PDiag(diag::err_cannot_pass_objc_interface_to_vararg_format)
<< S.getLangOpts().CPlusPlus11 << ExprTy << CallType
<< AT.getRepresentativeTypeName(S.Context) << CSR
<< E->getSourceRange(),
E->getBeginLoc(), /*IsStringLocation*/ false, CSR);
else
// FIXME: If this is an initializer list, suggest removing the braces
// or inserting a cast to the target type.
S.Diag(E->getBeginLoc(), diag::err_cannot_pass_to_vararg_format)
<< isa<InitListExpr>(E) << ExprTy << CallType
<< AT.getRepresentativeTypeName(S.Context) << E->getSourceRange();
break;
}
assert(FirstDataArg + FS.getArgIndex() < CheckedVarArgs.size() &&
"format string specifier index out of range");
CheckedVarArgs[FirstDataArg + FS.getArgIndex()] = true;
}
return true;
}
//===--- CHECK: Scanf format string checking ------------------------------===//
namespace {
class CheckScanfHandler : public CheckFormatHandler {
public:
CheckScanfHandler(Sema &s, const FormatStringLiteral *fexpr,
const Expr *origFormatExpr, Sema::FormatStringType type,
unsigned firstDataArg, unsigned numDataArgs,
const char *beg, bool hasVAListArg,
ArrayRef<const Expr *> Args, unsigned formatIdx,
bool inFunctionCall, Sema::VariadicCallType CallType,
llvm::SmallBitVector &CheckedVarArgs,
UncoveredArgHandler &UncoveredArg)
: CheckFormatHandler(s, fexpr, origFormatExpr, type, firstDataArg,
numDataArgs, beg, hasVAListArg, Args, formatIdx,
inFunctionCall, CallType, CheckedVarArgs,
UncoveredArg) {}
bool HandleScanfSpecifier(const analyze_scanf::ScanfSpecifier &FS,
const char *startSpecifier,
unsigned specifierLen) override;
bool HandleInvalidScanfConversionSpecifier(
const analyze_scanf::ScanfSpecifier &FS,
const char *startSpecifier,
unsigned specifierLen) override;
void HandleIncompleteScanList(const char *start, const char *end) override;
};
} // namespace
void CheckScanfHandler::HandleIncompleteScanList(const char *start,
const char *end) {
EmitFormatDiagnostic(S.PDiag(diag::warn_scanf_scanlist_incomplete),
getLocationOfByte(end), /*IsStringLocation*/true,
getSpecifierRange(start, end - start));
}
bool CheckScanfHandler::HandleInvalidScanfConversionSpecifier(
const analyze_scanf::ScanfSpecifier &FS,
const char *startSpecifier,
unsigned specifierLen) {
const analyze_scanf::ScanfConversionSpecifier &CS =
FS.getConversionSpecifier();
return HandleInvalidConversionSpecifier(FS.getArgIndex(),
getLocationOfByte(CS.getStart()),
startSpecifier, specifierLen,
CS.getStart(), CS.getLength());
}
bool CheckScanfHandler::HandleScanfSpecifier(
const analyze_scanf::ScanfSpecifier &FS,
const char *startSpecifier,
unsigned specifierLen) {
using namespace analyze_scanf;
using namespace analyze_format_string;
const ScanfConversionSpecifier &CS = FS.getConversionSpecifier();
// Handle case where '%' and '*' don't consume an argument. These shouldn't
// be used to decide if we are using positional arguments consistently.
if (FS.consumesDataArgument()) {
if (atFirstArg) {
atFirstArg = false;
usesPositionalArgs = FS.usesPositionalArg();
}
else if (usesPositionalArgs != FS.usesPositionalArg()) {
HandlePositionalNonpositionalArgs(getLocationOfByte(CS.getStart()),
startSpecifier, specifierLen);
return false;
}
}
// Check if the field with is non-zero.
const OptionalAmount &Amt = FS.getFieldWidth();
if (Amt.getHowSpecified() == OptionalAmount::Constant) {
if (Amt.getConstantAmount() == 0) {
const CharSourceRange &R = getSpecifierRange(Amt.getStart(),
Amt.getConstantLength());
EmitFormatDiagnostic(S.PDiag(diag::warn_scanf_nonzero_width),
getLocationOfByte(Amt.getStart()),
/*IsStringLocation*/true, R,
FixItHint::CreateRemoval(R));
}
}
if (!FS.consumesDataArgument()) {
// FIXME: Technically specifying a precision or field width here
// makes no sense. Worth issuing a warning at some point.
return true;
}
// Consume the argument.
unsigned argIndex = FS.getArgIndex();
if (argIndex < NumDataArgs) {
// The check to see if the argIndex is valid will come later.
// We set the bit here because we may exit early from this
// function if we encounter some other error.
CoveredArgs.set(argIndex);
}
// Check the length modifier is valid with the given conversion specifier.
if (!FS.hasValidLengthModifier(S.getASTContext().getTargetInfo(),
S.getLangOpts()))
HandleInvalidLengthModifier(FS, CS, startSpecifier, specifierLen,
diag::warn_format_nonsensical_length);
else if (!FS.hasStandardLengthModifier())
HandleNonStandardLengthModifier(FS, startSpecifier, specifierLen);
else if (!FS.hasStandardLengthConversionCombination())
HandleInvalidLengthModifier(FS, CS, startSpecifier, specifierLen,
diag::warn_format_non_standard_conversion_spec);
if (!FS.hasStandardConversionSpecifier(S.getLangOpts()))
HandleNonStandardConversionSpecifier(CS, startSpecifier, specifierLen);
// The remaining checks depend on the data arguments.
if (HasVAListArg)
return true;
if (!CheckNumArgs(FS, CS, startSpecifier, specifierLen, argIndex))
return false;
// Check that the argument type matches the format specifier.
const Expr *Ex = getDataArg(argIndex);
if (!Ex)
return true;
const analyze_format_string::ArgType &AT = FS.getArgType(S.Context);
if (!AT.isValid()) {
return true;
}
analyze_format_string::ArgType::MatchKind Match =
AT.matchesType(S.Context, Ex->getType());
bool Pedantic = Match == analyze_format_string::ArgType::NoMatchPedantic;
if (Match == analyze_format_string::ArgType::Match)
return true;
ScanfSpecifier fixedFS = FS;
bool Success = fixedFS.fixType(Ex->getType(), Ex->IgnoreImpCasts()->getType(),
S.getLangOpts(), S.Context);
unsigned Diag =
Pedantic ? diag::warn_format_conversion_argument_type_mismatch_pedantic
: diag::warn_format_conversion_argument_type_mismatch;
if (Success) {
// Get the fix string from the fixed format specifier.
SmallString<128> buf;
llvm::raw_svector_ostream os(buf);
fixedFS.toString(os);
EmitFormatDiagnostic(
S.PDiag(Diag) << AT.getRepresentativeTypeName(S.Context)
<< Ex->getType() << false << Ex->getSourceRange(),
Ex->getBeginLoc(),
/*IsStringLocation*/ false,
getSpecifierRange(startSpecifier, specifierLen),
FixItHint::CreateReplacement(
getSpecifierRange(startSpecifier, specifierLen), os.str()));
} else {
EmitFormatDiagnostic(S.PDiag(Diag)
<< AT.getRepresentativeTypeName(S.Context)
<< Ex->getType() << false << Ex->getSourceRange(),
Ex->getBeginLoc(),
/*IsStringLocation*/ false,
getSpecifierRange(startSpecifier, specifierLen));
}
return true;
}
static void CheckFormatString(Sema &S, const FormatStringLiteral *FExpr,
const Expr *OrigFormatExpr,
ArrayRef<const Expr *> Args,
bool HasVAListArg, unsigned format_idx,
unsigned firstDataArg,
Sema::FormatStringType Type,
bool inFunctionCall,
Sema::VariadicCallType CallType,
llvm::SmallBitVector &CheckedVarArgs,
UncoveredArgHandler &UncoveredArg,
bool IgnoreStringsWithoutSpecifiers) {
// CHECK: is the format string a wide literal?
if (!FExpr->isAscii() && !FExpr->isUTF8()) {
CheckFormatHandler::EmitFormatDiagnostic(
S, inFunctionCall, Args[format_idx],
S.PDiag(diag::warn_format_string_is_wide_literal), FExpr->getBeginLoc(),
/*IsStringLocation*/ true, OrigFormatExpr->getSourceRange());
return;
}
// Str - The format string. NOTE: this is NOT null-terminated!
StringRef StrRef = FExpr->getString();
const char *Str = StrRef.data();
// Account for cases where the string literal is truncated in a declaration.
const ConstantArrayType *T =
S.Context.getAsConstantArrayType(FExpr->getType());
assert(T && "String literal not of constant array type!");
size_t TypeSize = T->getSize().getZExtValue();
size_t StrLen = std::min(std::max(TypeSize, size_t(1)) - 1, StrRef.size());
const unsigned numDataArgs = Args.size() - firstDataArg;
if (IgnoreStringsWithoutSpecifiers &&
!analyze_format_string::parseFormatStringHasFormattingSpecifiers(
Str, Str + StrLen, S.getLangOpts(), S.Context.getTargetInfo()))
return;
// Emit a warning if the string literal is truncated and does not contain an
// embedded null character.
if (TypeSize <= StrRef.size() &&
StrRef.substr(0, TypeSize).find('\0') == StringRef::npos) {
CheckFormatHandler::EmitFormatDiagnostic(
S, inFunctionCall, Args[format_idx],
S.PDiag(diag::warn_printf_format_string_not_null_terminated),
FExpr->getBeginLoc(),
/*IsStringLocation=*/true, OrigFormatExpr->getSourceRange());
return;
}
// CHECK: empty format string?
if (StrLen == 0 && numDataArgs > 0) {
CheckFormatHandler::EmitFormatDiagnostic(
S, inFunctionCall, Args[format_idx],
S.PDiag(diag::warn_empty_format_string), FExpr->getBeginLoc(),
/*IsStringLocation*/ true, OrigFormatExpr->getSourceRange());
return;
}
if (Type == Sema::FST_Printf || Type == Sema::FST_NSString ||
Type == Sema::FST_FreeBSDKPrintf || Type == Sema::FST_OSLog ||
Type == Sema::FST_OSTrace) {
CheckPrintfHandler H(
S, FExpr, OrigFormatExpr, Type, firstDataArg, numDataArgs,
(Type == Sema::FST_NSString || Type == Sema::FST_OSTrace), Str,
HasVAListArg, Args, format_idx, inFunctionCall, CallType,
CheckedVarArgs, UncoveredArg);
if (!analyze_format_string::ParsePrintfString(H, Str, Str + StrLen,
S.getLangOpts(),
S.Context.getTargetInfo(),
Type == Sema::FST_FreeBSDKPrintf))
H.DoneProcessing();
} else if (Type == Sema::FST_Scanf) {
CheckScanfHandler H(S, FExpr, OrigFormatExpr, Type, firstDataArg,
numDataArgs, Str, HasVAListArg, Args, format_idx,
inFunctionCall, CallType, CheckedVarArgs, UncoveredArg);
if (!analyze_format_string::ParseScanfString(H, Str, Str + StrLen,
S.getLangOpts(),
S.Context.getTargetInfo()))
H.DoneProcessing();
} // TODO: handle other formats
}
bool Sema::FormatStringHasSArg(const StringLiteral *FExpr) {
// Str - The format string. NOTE: this is NOT null-terminated!
StringRef StrRef = FExpr->getString();
const char *Str = StrRef.data();
// Account for cases where the string literal is truncated in a declaration.
const ConstantArrayType *T = Context.getAsConstantArrayType(FExpr->getType());
assert(T && "String literal not of constant array type!");
size_t TypeSize = T->getSize().getZExtValue();
size_t StrLen = std::min(std::max(TypeSize, size_t(1)) - 1, StrRef.size());
return analyze_format_string::ParseFormatStringHasSArg(Str, Str + StrLen,
getLangOpts(),
Context.getTargetInfo());
}
//===--- CHECK: Warn on use of wrong absolute value function. -------------===//
// Returns the related absolute value function that is larger, of 0 if one
// does not exist.
static unsigned getLargerAbsoluteValueFunction(unsigned AbsFunction) {
switch (AbsFunction) {
default:
return 0;
case Builtin::BI__builtin_abs:
return Builtin::BI__builtin_labs;
case Builtin::BI__builtin_labs:
return Builtin::BI__builtin_llabs;
case Builtin::BI__builtin_llabs:
return 0;
case Builtin::BI__builtin_fabsf:
return Builtin::BI__builtin_fabs;
case Builtin::BI__builtin_fabs:
return Builtin::BI__builtin_fabsl;
case Builtin::BI__builtin_fabsl:
return 0;
case Builtin::BI__builtin_cabsf:
return Builtin::BI__builtin_cabs;
case Builtin::BI__builtin_cabs:
return Builtin::BI__builtin_cabsl;
case Builtin::BI__builtin_cabsl:
return 0;
case Builtin::BIabs:
return Builtin::BIlabs;
case Builtin::BIlabs:
return Builtin::BIllabs;
case Builtin::BIllabs:
return 0;
case Builtin::BIfabsf:
return Builtin::BIfabs;
case Builtin::BIfabs:
return Builtin::BIfabsl;
case Builtin::BIfabsl:
return 0;
case Builtin::BIcabsf:
return Builtin::BIcabs;
case Builtin::BIcabs:
return Builtin::BIcabsl;
case Builtin::BIcabsl:
return 0;
}
}
// Returns the argument type of the absolute value function.
static QualType getAbsoluteValueArgumentType(ASTContext &Context,
unsigned AbsType) {
if (AbsType == 0)
return QualType();
ASTContext::GetBuiltinTypeError Error = ASTContext::GE_None;
QualType BuiltinType = Context.GetBuiltinType(AbsType, Error);
if (Error != ASTContext::GE_None)
return QualType();
const FunctionProtoType *FT = BuiltinType->getAs<FunctionProtoType>();
if (!FT)
return QualType();
if (FT->getNumParams() != 1)
return QualType();
return FT->getParamType(0);
}
// Returns the best absolute value function, or zero, based on type and
// current absolute value function.
static unsigned getBestAbsFunction(ASTContext &Context, QualType ArgType,
unsigned AbsFunctionKind) {
unsigned BestKind = 0;
uint64_t ArgSize = Context.getTypeSize(ArgType);
for (unsigned Kind = AbsFunctionKind; Kind != 0;
Kind = getLargerAbsoluteValueFunction(Kind)) {
QualType ParamType = getAbsoluteValueArgumentType(Context, Kind);
if (Context.getTypeSize(ParamType) >= ArgSize) {
if (BestKind == 0)
BestKind = Kind;
else if (Context.hasSameType(ParamType, ArgType)) {
BestKind = Kind;
break;
}
}
}
return BestKind;
}
enum AbsoluteValueKind {
AVK_Integer,
AVK_Floating,
AVK_Complex
};
static AbsoluteValueKind getAbsoluteValueKind(QualType T) {
if (T->isIntegralOrEnumerationType())
return AVK_Integer;
if (T->isRealFloatingType())
return AVK_Floating;
if (T->isAnyComplexType())
return AVK_Complex;
llvm_unreachable("Type not integer, floating, or complex");
}
// Changes the absolute value function to a different type. Preserves whether
// the function is a builtin.
static unsigned changeAbsFunction(unsigned AbsKind,
AbsoluteValueKind ValueKind) {
switch (ValueKind) {
case AVK_Integer:
switch (AbsKind) {
default:
return 0;
case Builtin::BI__builtin_fabsf:
case Builtin::BI__builtin_fabs:
case Builtin::BI__builtin_fabsl:
case Builtin::BI__builtin_cabsf:
case Builtin::BI__builtin_cabs:
case Builtin::BI__builtin_cabsl:
return Builtin::BI__builtin_abs;
case Builtin::BIfabsf:
case Builtin::BIfabs:
case Builtin::BIfabsl:
case Builtin::BIcabsf:
case Builtin::BIcabs:
case Builtin::BIcabsl:
return Builtin::BIabs;
}
case AVK_Floating:
switch (AbsKind) {
default:
return 0;
case Builtin::BI__builtin_abs:
case Builtin::BI__builtin_labs:
case Builtin::BI__builtin_llabs:
case Builtin::BI__builtin_cabsf:
case Builtin::BI__builtin_cabs:
case Builtin::BI__builtin_cabsl:
return Builtin::BI__builtin_fabsf;
case Builtin::BIabs:
case Builtin::BIlabs:
case Builtin::BIllabs:
case Builtin::BIcabsf:
case Builtin::BIcabs:
case Builtin::BIcabsl:
return Builtin::BIfabsf;
}
case AVK_Complex:
switch (AbsKind) {
default:
return 0;
case Builtin::BI__builtin_abs:
case Builtin::BI__builtin_labs:
case Builtin::BI__builtin_llabs:
case Builtin::BI__builtin_fabsf:
case Builtin::BI__builtin_fabs:
case Builtin::BI__builtin_fabsl:
return Builtin::BI__builtin_cabsf;
case Builtin::BIabs:
case Builtin::BIlabs:
case Builtin::BIllabs:
case Builtin::BIfabsf:
case Builtin::BIfabs:
case Builtin::BIfabsl:
return Builtin::BIcabsf;
}
}
llvm_unreachable("Unable to convert function");
}
static unsigned getAbsoluteValueFunctionKind(const FunctionDecl *FDecl) {
const IdentifierInfo *FnInfo = FDecl->getIdentifier();
if (!FnInfo)
return 0;
switch (FDecl->getBuiltinID()) {
default:
return 0;
case Builtin::BI__builtin_abs:
case Builtin::BI__builtin_fabs:
case Builtin::BI__builtin_fabsf:
case Builtin::BI__builtin_fabsl:
case Builtin::BI__builtin_labs:
case Builtin::BI__builtin_llabs:
case Builtin::BI__builtin_cabs:
case Builtin::BI__builtin_cabsf:
case Builtin::BI__builtin_cabsl:
case Builtin::BIabs:
case Builtin::BIlabs:
case Builtin::BIllabs:
case Builtin::BIfabs:
case Builtin::BIfabsf:
case Builtin::BIfabsl:
case Builtin::BIcabs:
case Builtin::BIcabsf:
case Builtin::BIcabsl:
return FDecl->getBuiltinID();
}
llvm_unreachable("Unknown Builtin type");
}
// If the replacement is valid, emit a note with replacement function.
// Additionally, suggest including the proper header if not already included.
static void emitReplacement(Sema &S, SourceLocation Loc, SourceRange Range,
unsigned AbsKind, QualType ArgType) {
bool EmitHeaderHint = true;
const char *HeaderName = nullptr;
const char *FunctionName = nullptr;
if (S.getLangOpts().CPlusPlus && !ArgType->isAnyComplexType()) {
FunctionName = "std::abs";
if (ArgType->isIntegralOrEnumerationType()) {
HeaderName = "cstdlib";
} else if (ArgType->isRealFloatingType()) {
HeaderName = "cmath";
} else {
llvm_unreachable("Invalid Type");
}
// Lookup all std::abs
if (NamespaceDecl *Std = S.getStdNamespace()) {
LookupResult R(S, &S.Context.Idents.get("abs"), Loc, Sema::LookupAnyName);
R.suppressDiagnostics();
S.LookupQualifiedName(R, Std);
for (const auto *I : R) {
const FunctionDecl *FDecl = nullptr;
if (const UsingShadowDecl *UsingD = dyn_cast<UsingShadowDecl>(I)) {
FDecl = dyn_cast<FunctionDecl>(UsingD->getTargetDecl());
} else {
FDecl = dyn_cast<FunctionDecl>(I);
}
if (!FDecl)
continue;
// Found std::abs(), check that they are the right ones.
if (FDecl->getNumParams() != 1)
continue;
// Check that the parameter type can handle the argument.
QualType ParamType = FDecl->getParamDecl(0)->getType();
if (getAbsoluteValueKind(ArgType) == getAbsoluteValueKind(ParamType) &&
S.Context.getTypeSize(ArgType) <=
S.Context.getTypeSize(ParamType)) {
// Found a function, don't need the header hint.
EmitHeaderHint = false;
break;
}
}
}
} else {
FunctionName = S.Context.BuiltinInfo.getName(AbsKind);
HeaderName = S.Context.BuiltinInfo.getHeaderName(AbsKind);
if (HeaderName) {
DeclarationName DN(&S.Context.Idents.get(FunctionName));
LookupResult R(S, DN, Loc, Sema::LookupAnyName);
R.suppressDiagnostics();
S.LookupName(R, S.getCurScope());
if (R.isSingleResult()) {
FunctionDecl *FD = dyn_cast<FunctionDecl>(R.getFoundDecl());
if (FD && FD->getBuiltinID() == AbsKind) {
EmitHeaderHint = false;
} else {
return;
}
} else if (!R.empty()) {
return;
}
}
}
S.Diag(Loc, diag::note_replace_abs_function)
<< FunctionName << FixItHint::CreateReplacement(Range, FunctionName);
if (!HeaderName)
return;
if (!EmitHeaderHint)
return;
S.Diag(Loc, diag::note_include_header_or_declare) << HeaderName
<< FunctionName;
}
template <std::size_t StrLen>
static bool IsStdFunction(const FunctionDecl *FDecl,
const char (&Str)[StrLen]) {
if (!FDecl)
return false;
if (!FDecl->getIdentifier() || !FDecl->getIdentifier()->isStr(Str))
return false;
if (!FDecl->isInStdNamespace())
return false;
return true;
}
// Warn when using the wrong abs() function.
void Sema::CheckAbsoluteValueFunction(const CallExpr *Call,
const FunctionDecl *FDecl) {
if (Call->getNumArgs() != 1)
return;
unsigned AbsKind = getAbsoluteValueFunctionKind(FDecl);
bool IsStdAbs = IsStdFunction(FDecl, "abs");
if (AbsKind == 0 && !IsStdAbs)
return;
QualType ArgType = Call->getArg(0)->IgnoreParenImpCasts()->getType();
QualType ParamType = Call->getArg(0)->getType();
// Unsigned types cannot be negative. Suggest removing the absolute value
// function call.
if (ArgType->isUnsignedIntegerType()) {
const char *FunctionName =
IsStdAbs ? "std::abs" : Context.BuiltinInfo.getName(AbsKind);
Diag(Call->getExprLoc(), diag::warn_unsigned_abs) << ArgType << ParamType;
Diag(Call->getExprLoc(), diag::note_remove_abs)
<< FunctionName
<< FixItHint::CreateRemoval(Call->getCallee()->getSourceRange());
return;
}
// Taking the absolute value of a pointer is very suspicious, they probably
// wanted to index into an array, dereference a pointer, call a function, etc.
if (ArgType->isPointerType() || ArgType->canDecayToPointerType()) {
unsigned DiagType = 0;
if (ArgType->isFunctionType())
DiagType = 1;
else if (ArgType->isArrayType())
DiagType = 2;
Diag(Call->getExprLoc(), diag::warn_pointer_abs) << DiagType << ArgType;
return;
}
// std::abs has overloads which prevent most of the absolute value problems
// from occurring.
if (IsStdAbs)
return;
AbsoluteValueKind ArgValueKind = getAbsoluteValueKind(ArgType);
AbsoluteValueKind ParamValueKind = getAbsoluteValueKind(ParamType);
// The argument and parameter are the same kind. Check if they are the right
// size.
if (ArgValueKind == ParamValueKind) {
if (Context.getTypeSize(ArgType) <= Context.getTypeSize(ParamType))
return;
unsigned NewAbsKind = getBestAbsFunction(Context, ArgType, AbsKind);
Diag(Call->getExprLoc(), diag::warn_abs_too_small)
<< FDecl << ArgType << ParamType;
if (NewAbsKind == 0)
return;
emitReplacement(*this, Call->getExprLoc(),
Call->getCallee()->getSourceRange(), NewAbsKind, ArgType);
return;
}
// ArgValueKind != ParamValueKind
// The wrong type of absolute value function was used. Attempt to find the
// proper one.
unsigned NewAbsKind = changeAbsFunction(AbsKind, ArgValueKind);
NewAbsKind = getBestAbsFunction(Context, ArgType, NewAbsKind);
if (NewAbsKind == 0)
return;
Diag(Call->getExprLoc(), diag::warn_wrong_absolute_value_type)
<< FDecl << ParamValueKind << ArgValueKind;
emitReplacement(*this, Call->getExprLoc(),
Call->getCallee()->getSourceRange(), NewAbsKind, ArgType);
}
//===--- CHECK: Warn on use of std::max and unsigned zero. r---------------===//
void Sema::CheckMaxUnsignedZero(const CallExpr *Call,
const FunctionDecl *FDecl) {
if (!Call || !FDecl) return;
// Ignore template specializations and macros.
if (inTemplateInstantiation()) return;
if (Call->getExprLoc().isMacroID()) return;
// Only care about the one template argument, two function parameter std::max
if (Call->getNumArgs() != 2) return;
if (!IsStdFunction(FDecl, "max")) return;
const auto * ArgList = FDecl->getTemplateSpecializationArgs();
if (!ArgList) return;
if (ArgList->size() != 1) return;
// Check that template type argument is unsigned integer.
const auto& TA = ArgList->get(0);
if (TA.getKind() != TemplateArgument::Type) return;
QualType ArgType = TA.getAsType();
if (!ArgType->isUnsignedIntegerType()) return;
// See if either argument is a literal zero.
auto IsLiteralZeroArg = [](const Expr* E) -> bool {
const auto *MTE = dyn_cast<MaterializeTemporaryExpr>(E);
if (!MTE) return false;
const auto *Num = dyn_cast<IntegerLiteral>(MTE->getSubExpr());
if (!Num) return false;
if (Num->getValue() != 0) return false;
return true;
};
const Expr *FirstArg = Call->getArg(0);
const Expr *SecondArg = Call->getArg(1);
const bool IsFirstArgZero = IsLiteralZeroArg(FirstArg);
const bool IsSecondArgZero = IsLiteralZeroArg(SecondArg);
// Only warn when exactly one argument is zero.
if (IsFirstArgZero == IsSecondArgZero) return;
SourceRange FirstRange = FirstArg->getSourceRange();
SourceRange SecondRange = SecondArg->getSourceRange();
SourceRange ZeroRange = IsFirstArgZero ? FirstRange : SecondRange;
Diag(Call->getExprLoc(), diag::warn_max_unsigned_zero)
<< IsFirstArgZero << Call->getCallee()->getSourceRange() << ZeroRange;
// Deduce what parts to remove so that "std::max(0u, foo)" becomes "(foo)".
SourceRange RemovalRange;
if (IsFirstArgZero) {
RemovalRange = SourceRange(FirstRange.getBegin(),
SecondRange.getBegin().getLocWithOffset(-1));
} else {
RemovalRange = SourceRange(getLocForEndOfToken(FirstRange.getEnd()),
SecondRange.getEnd());
}
Diag(Call->getExprLoc(), diag::note_remove_max_call)
<< FixItHint::CreateRemoval(Call->getCallee()->getSourceRange())
<< FixItHint::CreateRemoval(RemovalRange);
}
//===--- CHECK: Standard memory functions ---------------------------------===//
/// Takes the expression passed to the size_t parameter of functions
/// such as memcmp, strncat, etc and warns if it's a comparison.
///
/// This is to catch typos like `if (memcmp(&a, &b, sizeof(a) > 0))`.
static bool CheckMemorySizeofForComparison(Sema &S, const Expr *E,
IdentifierInfo *FnName,
SourceLocation FnLoc,
SourceLocation RParenLoc) {
const BinaryOperator *Size = dyn_cast<BinaryOperator>(E);
if (!Size)
return false;
// if E is binop and op is <=>, >, <, >=, <=, ==, &&, ||:
if (!Size->isComparisonOp() && !Size->isLogicalOp())
return false;
SourceRange SizeRange = Size->getSourceRange();
S.Diag(Size->getOperatorLoc(), diag::warn_memsize_comparison)
<< SizeRange << FnName;
S.Diag(FnLoc, diag::note_memsize_comparison_paren)
<< FnName
<< FixItHint::CreateInsertion(
S.getLocForEndOfToken(Size->getLHS()->getEndLoc()), ")")
<< FixItHint::CreateRemoval(RParenLoc);
S.Diag(SizeRange.getBegin(), diag::note_memsize_comparison_cast_silence)
<< FixItHint::CreateInsertion(SizeRange.getBegin(), "(size_t)(")
<< FixItHint::CreateInsertion(S.getLocForEndOfToken(SizeRange.getEnd()),
")");
return true;
}
/// Determine whether the given type is or contains a dynamic class type
/// (e.g., whether it has a vtable).
static const CXXRecordDecl *getContainedDynamicClass(QualType T,
bool &IsContained) {
// Look through array types while ignoring qualifiers.
const Type *Ty = T->getBaseElementTypeUnsafe();
IsContained = false;
const CXXRecordDecl *RD = Ty->getAsCXXRecordDecl();
RD = RD ? RD->getDefinition() : nullptr;
if (!RD || RD->isInvalidDecl())
return nullptr;
if (RD->isDynamicClass())
return RD;
// Check all the fields. If any bases were dynamic, the class is dynamic.
// It's impossible for a class to transitively contain itself by value, so
// infinite recursion is impossible.
for (auto *FD : RD->fields()) {
bool SubContained;
if (const CXXRecordDecl *ContainedRD =
getContainedDynamicClass(FD->getType(), SubContained)) {
IsContained = true;
return ContainedRD;
}
}
return nullptr;
}
static const UnaryExprOrTypeTraitExpr *getAsSizeOfExpr(const Expr *E) {
if (const auto *Unary = dyn_cast<UnaryExprOrTypeTraitExpr>(E))
if (Unary->getKind() == UETT_SizeOf)
return Unary;
return nullptr;
}
/// If E is a sizeof expression, returns its argument expression,
/// otherwise returns NULL.
static const Expr *getSizeOfExprArg(const Expr *E) {
if (const UnaryExprOrTypeTraitExpr *SizeOf = getAsSizeOfExpr(E))
if (!SizeOf->isArgumentType())
return SizeOf->getArgumentExpr()->IgnoreParenImpCasts();
return nullptr;
}
/// If E is a sizeof expression, returns its argument type.
static QualType getSizeOfArgType(const Expr *E) {
if (const UnaryExprOrTypeTraitExpr *SizeOf = getAsSizeOfExpr(E))
return SizeOf->getTypeOfArgument();
return QualType();
}
namespace {
struct SearchNonTrivialToInitializeField
: DefaultInitializedTypeVisitor<SearchNonTrivialToInitializeField> {
using Super =
DefaultInitializedTypeVisitor<SearchNonTrivialToInitializeField>;
SearchNonTrivialToInitializeField(const Expr *E, Sema &S) : E(E), S(S) {}
void visitWithKind(QualType::PrimitiveDefaultInitializeKind PDIK, QualType FT,
SourceLocation SL) {
if (const auto *AT = asDerived().getContext().getAsArrayType(FT)) {
asDerived().visitArray(PDIK, AT, SL);
return;
}
Super::visitWithKind(PDIK, FT, SL);
}
void visitARCStrong(QualType FT, SourceLocation SL) {
S.DiagRuntimeBehavior(SL, E, S.PDiag(diag::note_nontrivial_field) << 1);
}
void visitARCWeak(QualType FT, SourceLocation SL) {
S.DiagRuntimeBehavior(SL, E, S.PDiag(diag::note_nontrivial_field) << 1);
}
void visitStruct(QualType FT, SourceLocation SL) {
for (const FieldDecl *FD : FT->castAs<RecordType>()->getDecl()->fields())
visit(FD->getType(), FD->getLocation());
}
void visitArray(QualType::PrimitiveDefaultInitializeKind PDIK,
const ArrayType *AT, SourceLocation SL) {
visit(getContext().getBaseElementType(AT), SL);
}
void visitTrivial(QualType FT, SourceLocation SL) {}
static void diag(QualType RT, const Expr *E, Sema &S) {
SearchNonTrivialToInitializeField(E, S).visitStruct(RT, SourceLocation());
}
ASTContext &getContext() { return S.getASTContext(); }
const Expr *E;
Sema &S;
};
struct SearchNonTrivialToCopyField
: CopiedTypeVisitor<SearchNonTrivialToCopyField, false> {
using Super = CopiedTypeVisitor<SearchNonTrivialToCopyField, false>;
SearchNonTrivialToCopyField(const Expr *E, Sema &S) : E(E), S(S) {}
void visitWithKind(QualType::PrimitiveCopyKind PCK, QualType FT,
SourceLocation SL) {
if (const auto *AT = asDerived().getContext().getAsArrayType(FT)) {
asDerived().visitArray(PCK, AT, SL);
return;
}
Super::visitWithKind(PCK, FT, SL);
}
void visitARCStrong(QualType FT, SourceLocation SL) {
S.DiagRuntimeBehavior(SL, E, S.PDiag(diag::note_nontrivial_field) << 0);
}
void visitARCWeak(QualType FT, SourceLocation SL) {
S.DiagRuntimeBehavior(SL, E, S.PDiag(diag::note_nontrivial_field) << 0);
}
void visitStruct(QualType FT, SourceLocation SL) {
for (const FieldDecl *FD : FT->castAs<RecordType>()->getDecl()->fields())
visit(FD->getType(), FD->getLocation());
}
void visitArray(QualType::PrimitiveCopyKind PCK, const ArrayType *AT,
SourceLocation SL) {
visit(getContext().getBaseElementType(AT), SL);
}
void preVisit(QualType::PrimitiveCopyKind PCK, QualType FT,
SourceLocation SL) {}
void visitTrivial(QualType FT, SourceLocation SL) {}
void visitVolatileTrivial(QualType FT, SourceLocation SL) {}
static void diag(QualType RT, const Expr *E, Sema &S) {
SearchNonTrivialToCopyField(E, S).visitStruct(RT, SourceLocation());
}
ASTContext &getContext() { return S.getASTContext(); }
const Expr *E;
Sema &S;
};
}
/// Detect if \c SizeofExpr is likely to calculate the sizeof an object.
static bool doesExprLikelyComputeSize(const Expr *SizeofExpr) {
SizeofExpr = SizeofExpr->IgnoreParenImpCasts();
if (const auto *BO = dyn_cast<BinaryOperator>(SizeofExpr)) {
if (BO->getOpcode() != BO_Mul && BO->getOpcode() != BO_Add)
return false;
return doesExprLikelyComputeSize(BO->getLHS()) ||
doesExprLikelyComputeSize(BO->getRHS());
}
return getAsSizeOfExpr(SizeofExpr) != nullptr;
}
/// Check if the ArgLoc originated from a macro passed to the call at CallLoc.
///
/// \code
/// #define MACRO 0
/// foo(MACRO);
/// foo(0);
/// \endcode
///
/// This should return true for the first call to foo, but not for the second
/// (regardless of whether foo is a macro or function).
static bool isArgumentExpandedFromMacro(SourceManager &SM,
SourceLocation CallLoc,
SourceLocation ArgLoc) {
if (!CallLoc.isMacroID())
return SM.getFileID(CallLoc) != SM.getFileID(ArgLoc);
return SM.getFileID(SM.getImmediateMacroCallerLoc(CallLoc)) !=
SM.getFileID(SM.getImmediateMacroCallerLoc(ArgLoc));
}
/// Diagnose cases like 'memset(buf, sizeof(buf), 0)', which should have the
/// last two arguments transposed.
static void CheckMemaccessSize(Sema &S, unsigned BId, const CallExpr *Call) {
if (BId != Builtin::BImemset && BId != Builtin::BIbzero)
return;
const Expr *SizeArg =
Call->getArg(BId == Builtin::BImemset ? 2 : 1)->IgnoreImpCasts();
auto isLiteralZero = [](const Expr *E) {
return isa<IntegerLiteral>(E) && cast<IntegerLiteral>(E)->getValue() == 0;
};
// If we're memsetting or bzeroing 0 bytes, then this is likely an error.
SourceLocation CallLoc = Call->getRParenLoc();
SourceManager &SM = S.getSourceManager();
if (isLiteralZero(SizeArg) &&
!isArgumentExpandedFromMacro(SM, CallLoc, SizeArg->getExprLoc())) {
SourceLocation DiagLoc = SizeArg->getExprLoc();
// Some platforms #define bzero to __builtin_memset. See if this is the
// case, and if so, emit a better diagnostic.
if (BId == Builtin::BIbzero ||
(CallLoc.isMacroID() && Lexer::getImmediateMacroName(
CallLoc, SM, S.getLangOpts()) == "bzero")) {
S.Diag(DiagLoc, diag::warn_suspicious_bzero_size);
S.Diag(DiagLoc, diag::note_suspicious_bzero_size_silence);
} else if (!isLiteralZero(Call->getArg(1)->IgnoreImpCasts())) {
S.Diag(DiagLoc, diag::warn_suspicious_sizeof_memset) << 0;
S.Diag(DiagLoc, diag::note_suspicious_sizeof_memset_silence) << 0;
}
return;
}
// If the second argument to a memset is a sizeof expression and the third
// isn't, this is also likely an error. This should catch
// 'memset(buf, sizeof(buf), 0xff)'.
if (BId == Builtin::BImemset &&
doesExprLikelyComputeSize(Call->getArg(1)) &&
!doesExprLikelyComputeSize(Call->getArg(2))) {
SourceLocation DiagLoc = Call->getArg(1)->getExprLoc();
S.Diag(DiagLoc, diag::warn_suspicious_sizeof_memset) << 1;
S.Diag(DiagLoc, diag::note_suspicious_sizeof_memset_silence) << 1;
return;
}
}
/// Check for dangerous or invalid arguments to memset().
///
/// This issues warnings on known problematic, dangerous or unspecified
/// arguments to the standard 'memset', 'memcpy', 'memmove', and 'memcmp'
/// function calls.
///
/// \param Call The call expression to diagnose.
void Sema::CheckMemaccessArguments(const CallExpr *Call,
unsigned BId,
IdentifierInfo *FnName) {
assert(BId != 0);
// It is possible to have a non-standard definition of memset. Validate
// we have enough arguments, and if not, abort further checking.
unsigned ExpectedNumArgs =
(BId == Builtin::BIstrndup || BId == Builtin::BIbzero ? 2 : 3);
if (Call->getNumArgs() < ExpectedNumArgs)
return;
unsigned LastArg = (BId == Builtin::BImemset || BId == Builtin::BIbzero ||
BId == Builtin::BIstrndup ? 1 : 2);
unsigned LenArg =
(BId == Builtin::BIbzero || BId == Builtin::BIstrndup ? 1 : 2);
const Expr *LenExpr = Call->getArg(LenArg)->IgnoreParenImpCasts();
if (CheckMemorySizeofForComparison(*this, LenExpr, FnName,
Call->getBeginLoc(), Call->getRParenLoc()))
return;
// Catch cases like 'memset(buf, sizeof(buf), 0)'.
CheckMemaccessSize(*this, BId, Call);
// We have special checking when the length is a sizeof expression.
QualType SizeOfArgTy = getSizeOfArgType(LenExpr);
const Expr *SizeOfArg = getSizeOfExprArg(LenExpr);
llvm::FoldingSetNodeID SizeOfArgID;
// Although widely used, 'bzero' is not a standard function. Be more strict
// with the argument types before allowing diagnostics and only allow the
// form bzero(ptr, sizeof(...)).
QualType FirstArgTy = Call->getArg(0)->IgnoreParenImpCasts()->getType();
if (BId == Builtin::BIbzero && !FirstArgTy->getAs<PointerType>())
return;
for (unsigned ArgIdx = 0; ArgIdx != LastArg; ++ArgIdx) {
const Expr *Dest = Call->getArg(ArgIdx)->IgnoreParenImpCasts();
SourceRange ArgRange = Call->getArg(ArgIdx)->getSourceRange();
QualType DestTy = Dest->getType();
QualType PointeeTy;
if (const PointerType *DestPtrTy = DestTy->getAs<PointerType>()) {
PointeeTy = DestPtrTy->getPointeeType();
// Never warn about void type pointers. This can be used to suppress
// false positives.
if (PointeeTy->isVoidType())
continue;
// Catch "memset(p, 0, sizeof(p))" -- needs to be sizeof(*p). Do this by
// actually comparing the expressions for equality. Because computing the
// expression IDs can be expensive, we only do this if the diagnostic is
// enabled.
if (SizeOfArg &&
!Diags.isIgnored(diag::warn_sizeof_pointer_expr_memaccess,
SizeOfArg->getExprLoc())) {
// We only compute IDs for expressions if the warning is enabled, and
// cache the sizeof arg's ID.
if (SizeOfArgID == llvm::FoldingSetNodeID())
SizeOfArg->Profile(SizeOfArgID, Context, true);
llvm::FoldingSetNodeID DestID;
Dest->Profile(DestID, Context, true);
if (DestID == SizeOfArgID) {
// TODO: For strncpy() and friends, this could suggest sizeof(dst)
// over sizeof(src) as well.
unsigned ActionIdx = 0; // Default is to suggest dereferencing.
StringRef ReadableName = FnName->getName();
if (const UnaryOperator *UnaryOp = dyn_cast<UnaryOperator>(Dest))
if (UnaryOp->getOpcode() == UO_AddrOf)
ActionIdx = 1; // If its an address-of operator, just remove it.
if (!PointeeTy->isIncompleteType() &&
(Context.getTypeSize(PointeeTy) == Context.getCharWidth()))
ActionIdx = 2; // If the pointee's size is sizeof(char),
// suggest an explicit length.
// If the function is defined as a builtin macro, do not show macro
// expansion.
SourceLocation SL = SizeOfArg->getExprLoc();
SourceRange DSR = Dest->getSourceRange();
SourceRange SSR = SizeOfArg->getSourceRange();
SourceManager &SM = getSourceManager();
if (SM.isMacroArgExpansion(SL)) {
ReadableName = Lexer::getImmediateMacroName(SL, SM, LangOpts);
SL = SM.getSpellingLoc(SL);
DSR = SourceRange(SM.getSpellingLoc(DSR.getBegin()),
SM.getSpellingLoc(DSR.getEnd()));
SSR = SourceRange(SM.getSpellingLoc(SSR.getBegin()),
SM.getSpellingLoc(SSR.getEnd()));
}
DiagRuntimeBehavior(SL, SizeOfArg,
PDiag(diag::warn_sizeof_pointer_expr_memaccess)
<< ReadableName
<< PointeeTy
<< DestTy
<< DSR
<< SSR);
DiagRuntimeBehavior(SL, SizeOfArg,
PDiag(diag::warn_sizeof_pointer_expr_memaccess_note)
<< ActionIdx
<< SSR);
break;
}
}
// Also check for cases where the sizeof argument is the exact same
// type as the memory argument, and where it points to a user-defined
// record type.
if (SizeOfArgTy != QualType()) {
if (PointeeTy->isRecordType() &&
Context.typesAreCompatible(SizeOfArgTy, DestTy)) {
DiagRuntimeBehavior(LenExpr->getExprLoc(), Dest,
PDiag(diag::warn_sizeof_pointer_type_memaccess)
<< FnName << SizeOfArgTy << ArgIdx
<< PointeeTy << Dest->getSourceRange()
<< LenExpr->getSourceRange());
break;
}
}
} else if (DestTy->isArrayType()) {
PointeeTy = DestTy;
}
if (PointeeTy == QualType())
continue;
// Always complain about dynamic classes.
bool IsContained;
if (const CXXRecordDecl *ContainedRD =
getContainedDynamicClass(PointeeTy, IsContained)) {
unsigned OperationType = 0;
const bool IsCmp = BId == Builtin::BImemcmp || BId == Builtin::BIbcmp;
// "overwritten" if we're warning about the destination for any call
// but memcmp; otherwise a verb appropriate to the call.
if (ArgIdx != 0 || IsCmp) {
if (BId == Builtin::BImemcpy)
OperationType = 1;
else if(BId == Builtin::BImemmove)
OperationType = 2;
else if (IsCmp)
OperationType = 3;
}
DiagRuntimeBehavior(Dest->getExprLoc(), Dest,
PDiag(diag::warn_dyn_class_memaccess)
<< (IsCmp ? ArgIdx + 2 : ArgIdx) << FnName
<< IsContained << ContainedRD << OperationType
<< Call->getCallee()->getSourceRange());
} else if (PointeeTy.hasNonTrivialObjCLifetime() &&
BId != Builtin::BImemset)
DiagRuntimeBehavior(
Dest->getExprLoc(), Dest,
PDiag(diag::warn_arc_object_memaccess)
<< ArgIdx << FnName << PointeeTy
<< Call->getCallee()->getSourceRange());
else if (const auto *RT = PointeeTy->getAs<RecordType>()) {
if ((BId == Builtin::BImemset || BId == Builtin::BIbzero) &&
RT->getDecl()->isNonTrivialToPrimitiveDefaultInitialize()) {
DiagRuntimeBehavior(Dest->getExprLoc(), Dest,
PDiag(diag::warn_cstruct_memaccess)
<< ArgIdx << FnName << PointeeTy << 0);
SearchNonTrivialToInitializeField::diag(PointeeTy, Dest, *this);
} else if ((BId == Builtin::BImemcpy || BId == Builtin::BImemmove) &&
RT->getDecl()->isNonTrivialToPrimitiveCopy()) {
DiagRuntimeBehavior(Dest->getExprLoc(), Dest,
PDiag(diag::warn_cstruct_memaccess)
<< ArgIdx << FnName << PointeeTy << 1);
SearchNonTrivialToCopyField::diag(PointeeTy, Dest, *this);
} else {
continue;
}
} else
continue;
DiagRuntimeBehavior(
Dest->getExprLoc(), Dest,
PDiag(diag::note_bad_memaccess_silence)
<< FixItHint::CreateInsertion(ArgRange.getBegin(), "(void*)"));
break;
}
}
// A little helper routine: ignore addition and subtraction of integer literals.
// This intentionally does not ignore all integer constant expressions because
// we don't want to remove sizeof().
static const Expr *ignoreLiteralAdditions(const Expr *Ex, ASTContext &Ctx) {
Ex = Ex->IgnoreParenCasts();
while (true) {
const BinaryOperator * BO = dyn_cast<BinaryOperator>(Ex);
if (!BO || !BO->isAdditiveOp())
break;
const Expr *RHS = BO->getRHS()->IgnoreParenCasts();
const Expr *LHS = BO->getLHS()->IgnoreParenCasts();
if (isa<IntegerLiteral>(RHS))
Ex = LHS;
else if (isa<IntegerLiteral>(LHS))
Ex = RHS;
else
break;
}
return Ex;
}
static bool isConstantSizeArrayWithMoreThanOneElement(QualType Ty,
ASTContext &Context) {
// Only handle constant-sized or VLAs, but not flexible members.
if (const ConstantArrayType *CAT = Context.getAsConstantArrayType(Ty)) {
// Only issue the FIXIT for arrays of size > 1.
if (CAT->getSize().getSExtValue() <= 1)
return false;
} else if (!Ty->isVariableArrayType()) {
return false;
}
return true;
}
// Warn if the user has made the 'size' argument to strlcpy or strlcat
// be the size of the source, instead of the destination.
void Sema::CheckStrlcpycatArguments(const CallExpr *Call,
IdentifierInfo *FnName) {
// Don't crash if the user has the wrong number of arguments
unsigned NumArgs = Call->getNumArgs();
if ((NumArgs != 3) && (NumArgs != 4))
return;
const Expr *SrcArg = ignoreLiteralAdditions(Call->getArg(1), Context);
const Expr *SizeArg = ignoreLiteralAdditions(Call->getArg(2), Context);
const Expr *CompareWithSrc = nullptr;
if (CheckMemorySizeofForComparison(*this, SizeArg, FnName,
Call->getBeginLoc(), Call->getRParenLoc()))
return;
// Look for 'strlcpy(dst, x, sizeof(x))'
if (const Expr *Ex = getSizeOfExprArg(SizeArg))
CompareWithSrc = Ex;
else {
// Look for 'strlcpy(dst, x, strlen(x))'
if (const CallExpr *SizeCall = dyn_cast<CallExpr>(SizeArg)) {
if (SizeCall->getBuiltinCallee() == Builtin::BIstrlen &&
SizeCall->getNumArgs() == 1)
CompareWithSrc = ignoreLiteralAdditions(SizeCall->getArg(0), Context);
}
}
if (!CompareWithSrc)
return;
// Determine if the argument to sizeof/strlen is equal to the source
// argument. In principle there's all kinds of things you could do
// here, for instance creating an == expression and evaluating it with
// EvaluateAsBooleanCondition, but this uses a more direct technique:
const DeclRefExpr *SrcArgDRE = dyn_cast<DeclRefExpr>(SrcArg);
if (!SrcArgDRE)
return;
const DeclRefExpr *CompareWithSrcDRE = dyn_cast<DeclRefExpr>(CompareWithSrc);
if (!CompareWithSrcDRE ||
SrcArgDRE->getDecl() != CompareWithSrcDRE->getDecl())
return;
const Expr *OriginalSizeArg = Call->getArg(2);
Diag(CompareWithSrcDRE->getBeginLoc(), diag::warn_strlcpycat_wrong_size)
<< OriginalSizeArg->getSourceRange() << FnName;
// Output a FIXIT hint if the destination is an array (rather than a
// pointer to an array). This could be enhanced to handle some
// pointers if we know the actual size, like if DstArg is 'array+2'
// we could say 'sizeof(array)-2'.
const Expr *DstArg = Call->getArg(0)->IgnoreParenImpCasts();
if (!isConstantSizeArrayWithMoreThanOneElement(DstArg->getType(), Context))
return;
SmallString<128> sizeString;
llvm::raw_svector_ostream OS(sizeString);
OS << "sizeof(";
DstArg->printPretty(OS, nullptr, getPrintingPolicy());
OS << ")";
Diag(OriginalSizeArg->getBeginLoc(), diag::note_strlcpycat_wrong_size)
<< FixItHint::CreateReplacement(OriginalSizeArg->getSourceRange(),
OS.str());
}
/// Check if two expressions refer to the same declaration.
static bool referToTheSameDecl(const Expr *E1, const Expr *E2) {
if (const DeclRefExpr *D1 = dyn_cast_or_null<DeclRefExpr>(E1))
if (const DeclRefExpr *D2 = dyn_cast_or_null<DeclRefExpr>(E2))
return D1->getDecl() == D2->getDecl();
return false;
}
static const Expr *getStrlenExprArg(const Expr *E) {
if (const CallExpr *CE = dyn_cast<CallExpr>(E)) {
const FunctionDecl *FD = CE->getDirectCallee();
if (!FD || FD->getMemoryFunctionKind() != Builtin::BIstrlen)
return nullptr;
return CE->getArg(0)->IgnoreParenCasts();
}
return nullptr;
}
// Warn on anti-patterns as the 'size' argument to strncat.
// The correct size argument should look like following:
// strncat(dst, src, sizeof(dst) - strlen(dest) - 1);
void Sema::CheckStrncatArguments(const CallExpr *CE,
IdentifierInfo *FnName) {
// Don't crash if the user has the wrong number of arguments.
if (CE->getNumArgs() < 3)
return;
const Expr *DstArg = CE->getArg(0)->IgnoreParenCasts();
const Expr *SrcArg = CE->getArg(1)->IgnoreParenCasts();
const Expr *LenArg = CE->getArg(2)->IgnoreParenCasts();
if (CheckMemorySizeofForComparison(*this, LenArg, FnName, CE->getBeginLoc(),
CE->getRParenLoc()))
return;
// Identify common expressions, which are wrongly used as the size argument
// to strncat and may lead to buffer overflows.
unsigned PatternType = 0;
if (const Expr *SizeOfArg = getSizeOfExprArg(LenArg)) {
// - sizeof(dst)
if (referToTheSameDecl(SizeOfArg, DstArg))
PatternType = 1;
// - sizeof(src)
else if (referToTheSameDecl(SizeOfArg, SrcArg))
PatternType = 2;
} else if (const BinaryOperator *BE = dyn_cast<BinaryOperator>(LenArg)) {
if (BE->getOpcode() == BO_Sub) {
const Expr *L = BE->getLHS()->IgnoreParenCasts();
const Expr *R = BE->getRHS()->IgnoreParenCasts();
// - sizeof(dst) - strlen(dst)
if (referToTheSameDecl(DstArg, getSizeOfExprArg(L)) &&
referToTheSameDecl(DstArg, getStrlenExprArg(R)))
PatternType = 1;
// - sizeof(src) - (anything)
else if (referToTheSameDecl(SrcArg, getSizeOfExprArg(L)))
PatternType = 2;
}
}
if (PatternType == 0)
return;
// Generate the diagnostic.
SourceLocation SL = LenArg->getBeginLoc();
SourceRange SR = LenArg->getSourceRange();
SourceManager &SM = getSourceManager();
// If the function is defined as a builtin macro, do not show macro expansion.
if (SM.isMacroArgExpansion(SL)) {
SL = SM.getSpellingLoc(SL);
SR = SourceRange(SM.getSpellingLoc(SR.getBegin()),
SM.getSpellingLoc(SR.getEnd()));
}
// Check if the destination is an array (rather than a pointer to an array).
QualType DstTy = DstArg->getType();
bool isKnownSizeArray = isConstantSizeArrayWithMoreThanOneElement(DstTy,
Context);
if (!isKnownSizeArray) {
if (PatternType == 1)
Diag(SL, diag::warn_strncat_wrong_size) << SR;
else
Diag(SL, diag::warn_strncat_src_size) << SR;
return;
}
if (PatternType == 1)
Diag(SL, diag::warn_strncat_large_size) << SR;
else
Diag(SL, diag::warn_strncat_src_size) << SR;
SmallString<128> sizeString;
llvm::raw_svector_ostream OS(sizeString);
OS << "sizeof(";
DstArg->printPretty(OS, nullptr, getPrintingPolicy());
OS << ") - ";
OS << "strlen(";
DstArg->printPretty(OS, nullptr, getPrintingPolicy());
OS << ") - 1";
Diag(SL, diag::note_strncat_wrong_size)
<< FixItHint::CreateReplacement(SR, OS.str());
}
void
Sema::CheckReturnValExpr(Expr *RetValExp, QualType lhsType,
SourceLocation ReturnLoc,
bool isObjCMethod,
const AttrVec *Attrs,
const FunctionDecl *FD) {
// Check if the return value is null but should not be.
if (((Attrs && hasSpecificAttr<ReturnsNonNullAttr>(*Attrs)) ||
(!isObjCMethod && isNonNullType(Context, lhsType))) &&
CheckNonNullExpr(*this, RetValExp))
Diag(ReturnLoc, diag::warn_null_ret)
<< (isObjCMethod ? 1 : 0) << RetValExp->getSourceRange();
// C++11 [basic.stc.dynamic.allocation]p4:
// If an allocation function declared with a non-throwing
// exception-specification fails to allocate storage, it shall return
// a null pointer. Any other allocation function that fails to allocate
// storage shall indicate failure only by throwing an exception [...]
if (FD) {
OverloadedOperatorKind Op = FD->getOverloadedOperator();
if (Op == OO_New || Op == OO_Array_New) {
const FunctionProtoType *Proto
= FD->getType()->castAs<FunctionProtoType>();
if (!Proto->isNothrow(/*ResultIfDependent*/true) &&
CheckNonNullExpr(*this, RetValExp))
Diag(ReturnLoc, diag::warn_operator_new_returns_null)
<< FD << getLangOpts().CPlusPlus11;
}
}
}
//===--- CHECK: Floating-Point comparisons (-Wfloat-equal) ---------------===//
/// Check for comparisons of floating point operands using != and ==.
/// Issue a warning if these are no self-comparisons, as they are not likely
/// to do what the programmer intended.
void Sema::CheckFloatComparison(SourceLocation Loc, Expr* LHS, Expr *RHS) {
Expr* LeftExprSansParen = LHS->IgnoreParenImpCasts();
Expr* RightExprSansParen = RHS->IgnoreParenImpCasts();
// Special case: check for x == x (which is OK).
// Do not emit warnings for such cases.
if (DeclRefExpr* DRL = dyn_cast<DeclRefExpr>(LeftExprSansParen))
if (DeclRefExpr* DRR = dyn_cast<DeclRefExpr>(RightExprSansParen))
if (DRL->getDecl() == DRR->getDecl())
return;
// Special case: check for comparisons against literals that can be exactly
// represented by APFloat. In such cases, do not emit a warning. This
// is a heuristic: often comparison against such literals are used to
// detect if a value in a variable has not changed. This clearly can
// lead to false negatives.
if (FloatingLiteral* FLL = dyn_cast<FloatingLiteral>(LeftExprSansParen)) {
if (FLL->isExact())
return;
} else
if (FloatingLiteral* FLR = dyn_cast<FloatingLiteral>(RightExprSansParen))
if (FLR->isExact())
return;
// Check for comparisons with builtin types.
if (CallExpr* CL = dyn_cast<CallExpr>(LeftExprSansParen))
if (CL->getBuiltinCallee())
return;
if (CallExpr* CR = dyn_cast<CallExpr>(RightExprSansParen))
if (CR->getBuiltinCallee())
return;
// Emit the diagnostic.
Diag(Loc, diag::warn_floatingpoint_eq)
<< LHS->getSourceRange() << RHS->getSourceRange();
}
//===--- CHECK: Integer mixed-sign comparisons (-Wsign-compare) --------===//
//===--- CHECK: Lossy implicit conversions (-Wconversion) --------------===//
namespace {
/// Structure recording the 'active' range of an integer-valued
/// expression.
struct IntRange {
/// The number of bits active in the int. Note that this includes exactly one
/// sign bit if !NonNegative.
unsigned Width;
/// True if the int is known not to have negative values. If so, all leading
/// bits before Width are known zero, otherwise they are known to be the
/// same as the MSB within Width.
bool NonNegative;
IntRange(unsigned Width, bool NonNegative)
: Width(Width), NonNegative(NonNegative) {}
/// Number of bits excluding the sign bit.
unsigned valueBits() const {
return NonNegative ? Width : Width - 1;
}
/// Returns the range of the bool type.
static IntRange forBoolType() {
return IntRange(1, true);
}
/// Returns the range of an opaque value of the given integral type.
static IntRange forValueOfType(ASTContext &C, QualType T) {
return forValueOfCanonicalType(C,
T->getCanonicalTypeInternal().getTypePtr());
}
/// Returns the range of an opaque value of a canonical integral type.
static IntRange forValueOfCanonicalType(ASTContext &C, const Type *T) {
assert(T->isCanonicalUnqualified());
if (const VectorType *VT = dyn_cast<VectorType>(T))
T = VT->getElementType().getTypePtr();
if (const ComplexType *CT = dyn_cast<ComplexType>(T))
T = CT->getElementType().getTypePtr();
if (const AtomicType *AT = dyn_cast<AtomicType>(T))
T = AT->getValueType().getTypePtr();
if (!C.getLangOpts().CPlusPlus) {
// For enum types in C code, use the underlying datatype.
if (const EnumType *ET = dyn_cast<EnumType>(T))
T = ET->getDecl()->getIntegerType().getDesugaredType(C).getTypePtr();
} else if (const EnumType *ET = dyn_cast<EnumType>(T)) {
// For enum types in C++, use the known bit width of the enumerators.
EnumDecl *Enum = ET->getDecl();
// In C++11, enums can have a fixed underlying type. Use this type to
// compute the range.
if (Enum->isFixed()) {
return IntRange(C.getIntWidth(QualType(T, 0)),
!ET->isSignedIntegerOrEnumerationType());
}
unsigned NumPositive = Enum->getNumPositiveBits();
unsigned NumNegative = Enum->getNumNegativeBits();
if (NumNegative == 0)
return IntRange(NumPositive, true/*NonNegative*/);
else
return IntRange(std::max(NumPositive + 1, NumNegative),
false/*NonNegative*/);
}
if (const auto *EIT = dyn_cast<ExtIntType>(T))
return IntRange(EIT->getNumBits(), EIT->isUnsigned());
const BuiltinType *BT = cast<BuiltinType>(T);
assert(BT->isInteger());
return IntRange(C.getIntWidth(QualType(T, 0)), BT->isUnsignedInteger());
}
/// Returns the "target" range of a canonical integral type, i.e.
/// the range of values expressible in the type.
///
/// This matches forValueOfCanonicalType except that enums have the
/// full range of their type, not the range of their enumerators.
static IntRange forTargetOfCanonicalType(ASTContext &C, const Type *T) {
assert(T->isCanonicalUnqualified());
if (const VectorType *VT = dyn_cast<VectorType>(T))
T = VT->getElementType().getTypePtr();
if (const ComplexType *CT = dyn_cast<ComplexType>(T))
T = CT->getElementType().getTypePtr();
if (const AtomicType *AT = dyn_cast<AtomicType>(T))
T = AT->getValueType().getTypePtr();
if (const EnumType *ET = dyn_cast<EnumType>(T))
T = C.getCanonicalType(ET->getDecl()->getIntegerType()).getTypePtr();
if (const auto *EIT = dyn_cast<ExtIntType>(T))
return IntRange(EIT->getNumBits(), EIT->isUnsigned());
const BuiltinType *BT = cast<BuiltinType>(T);
assert(BT->isInteger());
return IntRange(C.getIntWidth(QualType(T, 0)), BT->isUnsignedInteger());
}
/// Returns the supremum of two ranges: i.e. their conservative merge.
static IntRange join(IntRange L, IntRange R) {
bool Unsigned = L.NonNegative && R.NonNegative;
return IntRange(std::max(L.valueBits(), R.valueBits()) + !Unsigned,
L.NonNegative && R.NonNegative);
}
/// Return the range of a bitwise-AND of the two ranges.
static IntRange bit_and(IntRange L, IntRange R) {
unsigned Bits = std::max(L.Width, R.Width);
bool NonNegative = false;
if (L.NonNegative) {
Bits = std::min(Bits, L.Width);
NonNegative = true;
}
if (R.NonNegative) {
Bits = std::min(Bits, R.Width);
NonNegative = true;
}
return IntRange(Bits, NonNegative);
}
/// Return the range of a sum of the two ranges.
static IntRange sum(IntRange L, IntRange R) {
bool Unsigned = L.NonNegative && R.NonNegative;
return IntRange(std::max(L.valueBits(), R.valueBits()) + 1 + !Unsigned,
Unsigned);
}
/// Return the range of a difference of the two ranges.
static IntRange difference(IntRange L, IntRange R) {
// We need a 1-bit-wider range if:
// 1) LHS can be negative: least value can be reduced.
// 2) RHS can be negative: greatest value can be increased.
bool CanWiden = !L.NonNegative || !R.NonNegative;
bool Unsigned = L.NonNegative && R.Width == 0;
return IntRange(std::max(L.valueBits(), R.valueBits()) + CanWiden +
!Unsigned,
Unsigned);
}
/// Return the range of a product of the two ranges.
static IntRange product(IntRange L, IntRange R) {
// If both LHS and RHS can be negative, we can form
// -2^L * -2^R = 2^(L + R)
// which requires L + R + 1 value bits to represent.
bool CanWiden = !L.NonNegative && !R.NonNegative;
bool Unsigned = L.NonNegative && R.NonNegative;
return IntRange(L.valueBits() + R.valueBits() + CanWiden + !Unsigned,
Unsigned);
}
/// Return the range of a remainder operation between the two ranges.
static IntRange rem(IntRange L, IntRange R) {
// The result of a remainder can't be larger than the result of
// either side. The sign of the result is the sign of the LHS.
bool Unsigned = L.NonNegative;
return IntRange(std::min(L.valueBits(), R.valueBits()) + !Unsigned,
Unsigned);
}
};
} // namespace
static IntRange GetValueRange(ASTContext &C, llvm::APSInt &value,
unsigned MaxWidth) {
if (value.isSigned() && value.isNegative())
return IntRange(value.getMinSignedBits(), false);
if (value.getBitWidth() > MaxWidth)
value = value.trunc(MaxWidth);
// isNonNegative() just checks the sign bit without considering
// signedness.
return IntRange(value.getActiveBits(), true);
}
static IntRange GetValueRange(ASTContext &C, APValue &result, QualType Ty,
unsigned MaxWidth) {
if (result.isInt())
return GetValueRange(C, result.getInt(), MaxWidth);
if (result.isVector()) {
IntRange R = GetValueRange(C, result.getVectorElt(0), Ty, MaxWidth);
for (unsigned i = 1, e = result.getVectorLength(); i != e; ++i) {
IntRange El = GetValueRange(C, result.getVectorElt(i), Ty, MaxWidth);
R = IntRange::join(R, El);
}
return R;
}
if (result.isComplexInt()) {
IntRange R = GetValueRange(C, result.getComplexIntReal(), MaxWidth);
IntRange I = GetValueRange(C, result.getComplexIntImag(), MaxWidth);
return IntRange::join(R, I);
}
// This can happen with lossless casts to intptr_t of "based" lvalues.
// Assume it might use arbitrary bits.
// FIXME: The only reason we need to pass the type in here is to get
// the sign right on this one case. It would be nice if APValue
// preserved this.
assert(result.isLValue() || result.isAddrLabelDiff());
return IntRange(MaxWidth, Ty->isUnsignedIntegerOrEnumerationType());
}
static QualType GetExprType(const Expr *E) {
QualType Ty = E->getType();
if (const AtomicType *AtomicRHS = Ty->getAs<AtomicType>())
Ty = AtomicRHS->getValueType();
return Ty;
}
/// Pseudo-evaluate the given integer expression, estimating the
/// range of values it might take.
///
/// \param MaxWidth The width to which the value will be truncated.
/// \param Approximate If \c true, return a likely range for the result: in
/// particular, assume that aritmetic on narrower types doesn't leave
/// those types. If \c false, return a range including all possible
/// result values.
static IntRange GetExprRange(ASTContext &C, const Expr *E, unsigned MaxWidth,
bool InConstantContext, bool Approximate) {
E = E->IgnoreParens();
// Try a full evaluation first.
Expr::EvalResult result;
if (E->EvaluateAsRValue(result, C, InConstantContext))
return GetValueRange(C, result.Val, GetExprType(E), MaxWidth);
// I think we only want to look through implicit casts here; if the
// user has an explicit widening cast, we should treat the value as
// being of the new, wider type.
if (const auto *CE = dyn_cast<ImplicitCastExpr>(E)) {
if (CE->getCastKind() == CK_NoOp || CE->getCastKind() == CK_LValueToRValue)
return GetExprRange(C, CE->getSubExpr(), MaxWidth, InConstantContext,
Approximate);
IntRange OutputTypeRange = IntRange::forValueOfType(C, GetExprType(CE));
bool isIntegerCast = CE->getCastKind() == CK_IntegralCast ||
CE->getCastKind() == CK_BooleanToSignedIntegral;
// Assume that non-integer casts can span the full range of the type.
if (!isIntegerCast)
return OutputTypeRange;
IntRange SubRange = GetExprRange(C, CE->getSubExpr(),
std::min(MaxWidth, OutputTypeRange.Width),
InConstantContext, Approximate);
// Bail out if the subexpr's range is as wide as the cast type.
if (SubRange.Width >= OutputTypeRange.Width)
return OutputTypeRange;
// Otherwise, we take the smaller width, and we're non-negative if
// either the output type or the subexpr is.
return IntRange(SubRange.Width,
SubRange.NonNegative || OutputTypeRange.NonNegative);
}
if (const auto *CO = dyn_cast<ConditionalOperator>(E)) {
// If we can fold the condition, just take that operand.
bool CondResult;
if (CO->getCond()->EvaluateAsBooleanCondition(CondResult, C))
return GetExprRange(C,
CondResult ? CO->getTrueExpr() : CO->getFalseExpr(),
MaxWidth, InConstantContext, Approximate);
// Otherwise, conservatively merge.
// GetExprRange requires an integer expression, but a throw expression
// results in a void type.
Expr *E = CO->getTrueExpr();
IntRange L = E->getType()->isVoidType()
? IntRange{0, true}
: GetExprRange(C, E, MaxWidth, InConstantContext, Approximate);
E = CO->getFalseExpr();
IntRange R = E->getType()->isVoidType()
? IntRange{0, true}
: GetExprRange(C, E, MaxWidth, InConstantContext, Approximate);
return IntRange::join(L, R);
}
if (const auto *BO = dyn_cast<BinaryOperator>(E)) {
IntRange (*Combine)(IntRange, IntRange) = IntRange::join;
switch (BO->getOpcode()) {
case BO_Cmp:
llvm_unreachable("builtin <=> should have class type");
// Boolean-valued operations are single-bit and positive.
case BO_LAnd:
case BO_LOr:
case BO_LT:
case BO_GT:
case BO_LE:
case BO_GE:
case BO_EQ:
case BO_NE:
return IntRange::forBoolType();
// The type of the assignments is the type of the LHS, so the RHS
// is not necessarily the same type.
case BO_MulAssign:
case BO_DivAssign:
case BO_RemAssign:
case BO_AddAssign:
case BO_SubAssign:
case BO_XorAssign:
case BO_OrAssign:
// TODO: bitfields?
return IntRange::forValueOfType(C, GetExprType(E));
// Simple assignments just pass through the RHS, which will have
// been coerced to the LHS type.
case BO_Assign:
// TODO: bitfields?
return GetExprRange(C, BO->getRHS(), MaxWidth, InConstantContext,
Approximate);
// Operations with opaque sources are black-listed.
case BO_PtrMemD:
case BO_PtrMemI:
return IntRange::forValueOfType(C, GetExprType(E));
// Bitwise-and uses the *infinum* of the two source ranges.
case BO_And:
case BO_AndAssign:
Combine = IntRange::bit_and;
break;
// Left shift gets black-listed based on a judgement call.
case BO_Shl:
// ...except that we want to treat '1 << (blah)' as logically
// positive. It's an important idiom.
if (IntegerLiteral *I
= dyn_cast<IntegerLiteral>(BO->getLHS()->IgnoreParenCasts())) {
if (I->getValue() == 1) {
IntRange R = IntRange::forValueOfType(C, GetExprType(E));
return IntRange(R.Width, /*NonNegative*/ true);
}
}
LLVM_FALLTHROUGH;
case BO_ShlAssign:
return IntRange::forValueOfType(C, GetExprType(E));
// Right shift by a constant can narrow its left argument.
case BO_Shr:
case BO_ShrAssign: {
IntRange L = GetExprRange(C, BO->getLHS(), MaxWidth, InConstantContext,
Approximate);
// If the shift amount is a positive constant, drop the width by
// that much.
if (Optional<llvm::APSInt> shift =
BO->getRHS()->getIntegerConstantExpr(C)) {
if (shift->isNonNegative()) {
unsigned zext = shift->getZExtValue();
if (zext >= L.Width)
L.Width = (L.NonNegative ? 0 : 1);
else
L.Width -= zext;
}
}
return L;
}
// Comma acts as its right operand.
case BO_Comma:
return GetExprRange(C, BO->getRHS(), MaxWidth, InConstantContext,
Approximate);
case BO_Add:
if (!Approximate)
Combine = IntRange::sum;
break;
case BO_Sub:
if (BO->getLHS()->getType()->isPointerType())
return IntRange::forValueOfType(C, GetExprType(E));
if (!Approximate)
Combine = IntRange::difference;
break;
case BO_Mul:
if (!Approximate)
Combine = IntRange::product;
break;
// The width of a division result is mostly determined by the size
// of the LHS.
case BO_Div: {
// Don't 'pre-truncate' the operands.
unsigned opWidth = C.getIntWidth(GetExprType(E));
IntRange L = GetExprRange(C, BO->getLHS(), opWidth, InConstantContext,
Approximate);
// If the divisor is constant, use that.
if (Optional<llvm::APSInt> divisor =
BO->getRHS()->getIntegerConstantExpr(C)) {
unsigned log2 = divisor->logBase2(); // floor(log_2(divisor))
if (log2 >= L.Width)
L.Width = (L.NonNegative ? 0 : 1);
else
L.Width = std::min(L.Width - log2, MaxWidth);
return L;
}
// Otherwise, just use the LHS's width.
// FIXME: This is wrong if the LHS could be its minimal value and the RHS
// could be -1.
IntRange R = GetExprRange(C, BO->getRHS(), opWidth, InConstantContext,
Approximate);
return IntRange(L.Width, L.NonNegative && R.NonNegative);
}
case BO_Rem:
Combine = IntRange::rem;
break;
// The default behavior is okay for these.
case BO_Xor:
case BO_Or:
break;
}
// Combine the two ranges, but limit the result to the type in which we
// performed the computation.
QualType T = GetExprType(E);
unsigned opWidth = C.getIntWidth(T);
IntRange L =
GetExprRange(C, BO->getLHS(), opWidth, InConstantContext, Approximate);
IntRange R =
GetExprRange(C, BO->getRHS(), opWidth, InConstantContext, Approximate);
IntRange C = Combine(L, R);
C.NonNegative |= T->isUnsignedIntegerOrEnumerationType();
C.Width = std::min(C.Width, MaxWidth);
return C;
}
if (const auto *UO = dyn_cast<UnaryOperator>(E)) {
switch (UO->getOpcode()) {
// Boolean-valued operations are white-listed.
case UO_LNot:
return IntRange::forBoolType();
// Operations with opaque sources are black-listed.
case UO_Deref:
case UO_AddrOf: // should be impossible
return IntRange::forValueOfType(C, GetExprType(E));
default:
return GetExprRange(C, UO->getSubExpr(), MaxWidth, InConstantContext,
Approximate);
}
}
if (const auto *OVE = dyn_cast<OpaqueValueExpr>(E))
return GetExprRange(C, OVE->getSourceExpr(), MaxWidth, InConstantContext,
Approximate);
if (const auto *BitField = E->getSourceBitField())
return IntRange(BitField->getBitWidthValue(C),
BitField->getType()->isUnsignedIntegerOrEnumerationType());
return IntRange::forValueOfType(C, GetExprType(E));
}
static IntRange GetExprRange(ASTContext &C, const Expr *E,
bool InConstantContext, bool Approximate) {
return GetExprRange(C, E, C.getIntWidth(GetExprType(E)), InConstantContext,
Approximate);
}
/// Checks whether the given value, which currently has the given
/// source semantics, has the same value when coerced through the
/// target semantics.
static bool IsSameFloatAfterCast(const llvm::APFloat &value,
const llvm::fltSemantics &Src,
const llvm::fltSemantics &Tgt) {
llvm::APFloat truncated = value;
bool ignored;
truncated.convert(Src, llvm::APFloat::rmNearestTiesToEven, &ignored);
truncated.convert(Tgt, llvm::APFloat::rmNearestTiesToEven, &ignored);
return truncated.bitwiseIsEqual(value);
}
/// Checks whether the given value, which currently has the given
/// source semantics, has the same value when coerced through the
/// target semantics.
///
/// The value might be a vector of floats (or a complex number).
static bool IsSameFloatAfterCast(const APValue &value,
const llvm::fltSemantics &Src,
const llvm::fltSemantics &Tgt) {
if (value.isFloat())
return IsSameFloatAfterCast(value.getFloat(), Src, Tgt);
if (value.isVector()) {
for (unsigned i = 0, e = value.getVectorLength(); i != e; ++i)
if (!IsSameFloatAfterCast(value.getVectorElt(i), Src, Tgt))
return false;
return true;
}
assert(value.isComplexFloat());
return (IsSameFloatAfterCast(value.getComplexFloatReal(), Src, Tgt) &&
IsSameFloatAfterCast(value.getComplexFloatImag(), Src, Tgt));
}
static void AnalyzeImplicitConversions(Sema &S, Expr *E, SourceLocation CC,
bool IsListInit = false);
static bool IsEnumConstOrFromMacro(Sema &S, Expr *E) {
// Suppress cases where we are comparing against an enum constant.
if (const DeclRefExpr *DR =
dyn_cast<DeclRefExpr>(E->IgnoreParenImpCasts()))
if (isa<EnumConstantDecl>(DR->getDecl()))
return true;
// Suppress cases where the value is expanded from a macro, unless that macro
// is how a language represents a boolean literal. This is the case in both C
// and Objective-C.
SourceLocation BeginLoc = E->getBeginLoc();
if (BeginLoc.isMacroID()) {
StringRef MacroName = Lexer::getImmediateMacroName(
BeginLoc, S.getSourceManager(), S.getLangOpts());
return MacroName != "YES" && MacroName != "NO" &&
MacroName != "true" && MacroName != "false";
}
return false;
}
static bool isKnownToHaveUnsignedValue(Expr *E) {
return E->getType()->isIntegerType() &&
(!E->getType()->isSignedIntegerType() ||
!E->IgnoreParenImpCasts()->getType()->isSignedIntegerType());
}
namespace {
/// The promoted range of values of a type. In general this has the
/// following structure:
///
/// |-----------| . . . |-----------|
/// ^ ^ ^ ^
/// Min HoleMin HoleMax Max
///
/// ... where there is only a hole if a signed type is promoted to unsigned
/// (in which case Min and Max are the smallest and largest representable
/// values).
struct PromotedRange {
// Min, or HoleMax if there is a hole.
llvm::APSInt PromotedMin;
// Max, or HoleMin if there is a hole.
llvm::APSInt PromotedMax;
PromotedRange(IntRange R, unsigned BitWidth, bool Unsigned) {
if (R.Width == 0)
PromotedMin = PromotedMax = llvm::APSInt(BitWidth, Unsigned);
else if (R.Width >= BitWidth && !Unsigned) {
// Promotion made the type *narrower*. This happens when promoting
// a < 32-bit unsigned / <= 32-bit signed bit-field to 'signed int'.
// Treat all values of 'signed int' as being in range for now.
PromotedMin = llvm::APSInt::getMinValue(BitWidth, Unsigned);
PromotedMax = llvm::APSInt::getMaxValue(BitWidth, Unsigned);
} else {
PromotedMin = llvm::APSInt::getMinValue(R.Width, R.NonNegative)
.extOrTrunc(BitWidth);
PromotedMin.setIsUnsigned(Unsigned);
PromotedMax = llvm::APSInt::getMaxValue(R.Width, R.NonNegative)
.extOrTrunc(BitWidth);
PromotedMax.setIsUnsigned(Unsigned);
}
}
// Determine whether this range is contiguous (has no hole).
bool isContiguous() const { return PromotedMin <= PromotedMax; }
// Where a constant value is within the range.
enum ComparisonResult {
LT = 0x1,
LE = 0x2,
GT = 0x4,
GE = 0x8,
EQ = 0x10,
NE = 0x20,
InRangeFlag = 0x40,
Less = LE | LT | NE,
Min = LE | InRangeFlag,
InRange = InRangeFlag,
Max = GE | InRangeFlag,
Greater = GE | GT | NE,
OnlyValue = LE | GE | EQ | InRangeFlag,
InHole = NE
};
ComparisonResult compare(const llvm::APSInt &Value) const {
assert(Value.getBitWidth() == PromotedMin.getBitWidth() &&
Value.isUnsigned() == PromotedMin.isUnsigned());
if (!isContiguous()) {
assert(Value.isUnsigned() && "discontiguous range for signed compare");
if (Value.isMinValue()) return Min;
if (Value.isMaxValue()) return Max;
if (Value >= PromotedMin) return InRange;
if (Value <= PromotedMax) return InRange;
return InHole;
}
switch (llvm::APSInt::compareValues(Value, PromotedMin)) {
case -1: return Less;
case 0: return PromotedMin == PromotedMax ? OnlyValue : Min;
case 1:
switch (llvm::APSInt::compareValues(Value, PromotedMax)) {
case -1: return InRange;
case 0: return Max;
case 1: return Greater;
}
}
llvm_unreachable("impossible compare result");
}
static llvm::Optional<StringRef>
constantValue(BinaryOperatorKind Op, ComparisonResult R, bool ConstantOnRHS) {
if (Op == BO_Cmp) {
ComparisonResult LTFlag = LT, GTFlag = GT;
if (ConstantOnRHS) std::swap(LTFlag, GTFlag);
if (R & EQ) return StringRef("'std::strong_ordering::equal'");
if (R & LTFlag) return StringRef("'std::strong_ordering::less'");
if (R & GTFlag) return StringRef("'std::strong_ordering::greater'");
return llvm::None;
}
ComparisonResult TrueFlag, FalseFlag;
if (Op == BO_EQ) {
TrueFlag = EQ;
FalseFlag = NE;
} else if (Op == BO_NE) {
TrueFlag = NE;
FalseFlag = EQ;
} else {
if ((Op == BO_LT || Op == BO_GE) ^ ConstantOnRHS) {
TrueFlag = LT;
FalseFlag = GE;
} else {
TrueFlag = GT;
FalseFlag = LE;
}
if (Op == BO_GE || Op == BO_LE)
std::swap(TrueFlag, FalseFlag);
}
if (R & TrueFlag)
return StringRef("true");
if (R & FalseFlag)
return StringRef("false");
return llvm::None;
}
};
}
static bool HasEnumType(Expr *E) {
// Strip off implicit integral promotions.
while (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) {
if (ICE->getCastKind() != CK_IntegralCast &&
ICE->getCastKind() != CK_NoOp)
break;
E = ICE->getSubExpr();
}
return E->getType()->isEnumeralType();
}
static int classifyConstantValue(Expr *Constant) {
// The values of this enumeration are used in the diagnostics
// diag::warn_out_of_range_compare and diag::warn_tautological_bool_compare.
enum ConstantValueKind {
Miscellaneous = 0,
LiteralTrue,
LiteralFalse
};
if (auto *BL = dyn_cast<CXXBoolLiteralExpr>(Constant))
return BL->getValue() ? ConstantValueKind::LiteralTrue
: ConstantValueKind::LiteralFalse;
return ConstantValueKind::Miscellaneous;
}
static bool CheckTautologicalComparison(Sema &S, BinaryOperator *E,
Expr *Constant, Expr *Other,
const llvm::APSInt &Value,
bool RhsConstant) {
if (S.inTemplateInstantiation())
return false;
Expr *OriginalOther = Other;
Constant = Constant->IgnoreParenImpCasts();
Other = Other->IgnoreParenImpCasts();
// Suppress warnings on tautological comparisons between values of the same
// enumeration type. There are only two ways we could warn on this:
// - If the constant is outside the range of representable values of
// the enumeration. In such a case, we should warn about the cast
// to enumeration type, not about the comparison.
// - If the constant is the maximum / minimum in-range value. For an
// enumeratin type, such comparisons can be meaningful and useful.
if (Constant->getType()->isEnumeralType() &&
S.Context.hasSameUnqualifiedType(Constant->getType(), Other->getType()))
return false;
IntRange OtherValueRange = GetExprRange(
S.Context, Other, S.isConstantEvaluated(), /*Approximate*/ false);
QualType OtherT = Other->getType();
if (const auto *AT = OtherT->getAs<AtomicType>())
OtherT = AT->getValueType();
IntRange OtherTypeRange = IntRange::forValueOfType(S.Context, OtherT);
// Special case for ObjC BOOL on targets where its a typedef for a signed char
// (Namely, macOS). FIXME: IntRange::forValueOfType should do this.
bool IsObjCSignedCharBool = S.getLangOpts().ObjC &&
S.NSAPIObj->isObjCBOOLType(OtherT) &&
OtherT->isSpecificBuiltinType(BuiltinType::SChar);
// Whether we're treating Other as being a bool because of the form of
// expression despite it having another type (typically 'int' in C).
bool OtherIsBooleanDespiteType =
!OtherT->isBooleanType() && Other->isKnownToHaveBooleanValue();
if (OtherIsBooleanDespiteType || IsObjCSignedCharBool)
OtherTypeRange = OtherValueRange = IntRange::forBoolType();
// Check if all values in the range of possible values of this expression
// lead to the same comparison outcome.
PromotedRange OtherPromotedValueRange(OtherValueRange, Value.getBitWidth(),
Value.isUnsigned());
auto Cmp = OtherPromotedValueRange.compare(Value);
auto Result = PromotedRange::constantValue(E->getOpcode(), Cmp, RhsConstant);
if (!Result)
return false;
// Also consider the range determined by the type alone. This allows us to
// classify the warning under the proper diagnostic group.
bool TautologicalTypeCompare = false;
{
PromotedRange OtherPromotedTypeRange(OtherTypeRange, Value.getBitWidth(),
Value.isUnsigned());
auto TypeCmp = OtherPromotedTypeRange.compare(Value);
if (auto TypeResult = PromotedRange::constantValue(E->getOpcode(), TypeCmp,
RhsConstant)) {
TautologicalTypeCompare = true;
Cmp = TypeCmp;
Result = TypeResult;
}
}
// Don't warn if the non-constant operand actually always evaluates to the
// same value.
if (!TautologicalTypeCompare && OtherValueRange.Width == 0)
return false;
// Suppress the diagnostic for an in-range comparison if the constant comes
// from a macro or enumerator. We don't want to diagnose
//
// some_long_value <= INT_MAX
//
// when sizeof(int) == sizeof(long).
bool InRange = Cmp & PromotedRange::InRangeFlag;
if (InRange && IsEnumConstOrFromMacro(S, Constant))
return false;
// A comparison of an unsigned bit-field against 0 is really a type problem,
// even though at the type level the bit-field might promote to 'signed int'.
if (Other->refersToBitField() && InRange && Value == 0 &&
Other->getType()->isUnsignedIntegerOrEnumerationType())
TautologicalTypeCompare = true;
// If this is a comparison to an enum constant, include that
// constant in the diagnostic.
const EnumConstantDecl *ED = nullptr;
if (const DeclRefExpr *DR = dyn_cast<DeclRefExpr>(Constant))
ED = dyn_cast<EnumConstantDecl>(DR->getDecl());
// Should be enough for uint128 (39 decimal digits)
SmallString<64> PrettySourceValue;
llvm::raw_svector_ostream OS(PrettySourceValue);
if (ED) {
OS << '\'' << *ED << "' (" << Value << ")";
} else if (auto *BL = dyn_cast<ObjCBoolLiteralExpr>(
Constant->IgnoreParenImpCasts())) {
OS << (BL->getValue() ? "YES" : "NO");
} else {
OS << Value;
}
if (!TautologicalTypeCompare) {
S.Diag(E->getOperatorLoc(), diag::warn_tautological_compare_value_range)
<< RhsConstant << OtherValueRange.Width << OtherValueRange.NonNegative
<< E->getOpcodeStr() << OS.str() << *Result
<< E->getLHS()->getSourceRange() << E->getRHS()->getSourceRange();
return true;
}
if (IsObjCSignedCharBool) {
S.DiagRuntimeBehavior(E->getOperatorLoc(), E,
S.PDiag(diag::warn_tautological_compare_objc_bool)
<< OS.str() << *Result);
return true;
}
// FIXME: We use a somewhat different formatting for the in-range cases and
// cases involving boolean values for historical reasons. We should pick a
// consistent way of presenting these diagnostics.
if (!InRange || Other->isKnownToHaveBooleanValue()) {
S.DiagRuntimeBehavior(
E->getOperatorLoc(), E,
S.PDiag(!InRange ? diag::warn_out_of_range_compare
: diag::warn_tautological_bool_compare)
<< OS.str() << classifyConstantValue(Constant) << OtherT
<< OtherIsBooleanDespiteType << *Result
<< E->getLHS()->getSourceRange() << E->getRHS()->getSourceRange());
} else {
unsigned Diag = (isKnownToHaveUnsignedValue(OriginalOther) && Value == 0)
? (HasEnumType(OriginalOther)
? diag::warn_unsigned_enum_always_true_comparison
: diag::warn_unsigned_always_true_comparison)
: diag::warn_tautological_constant_compare;
S.Diag(E->getOperatorLoc(), Diag)
<< RhsConstant << OtherT << E->getOpcodeStr() << OS.str() << *Result
<< E->getLHS()->getSourceRange() << E->getRHS()->getSourceRange();
}
return true;
}
/// Analyze the operands of the given comparison. Implements the
/// fallback case from AnalyzeComparison.
static void AnalyzeImpConvsInComparison(Sema &S, BinaryOperator *E) {
AnalyzeImplicitConversions(S, E->getLHS(), E->getOperatorLoc());
AnalyzeImplicitConversions(S, E->getRHS(), E->getOperatorLoc());
}
/// Implements -Wsign-compare.
///
/// \param E the binary operator to check for warnings
static void AnalyzeComparison(Sema &S, BinaryOperator *E) {
// The type the comparison is being performed in.
QualType T = E->getLHS()->getType();
// Only analyze comparison operators where both sides have been converted to
// the same type.
if (!S.Context.hasSameUnqualifiedType(T, E->getRHS()->getType()))
return AnalyzeImpConvsInComparison(S, E);
// Don't analyze value-dependent comparisons directly.
if (E->isValueDependent())
return AnalyzeImpConvsInComparison(S, E);
Expr *LHS = E->getLHS();
Expr *RHS = E->getRHS();
if (T->isIntegralType(S.Context)) {
Optional<llvm::APSInt> RHSValue = RHS->getIntegerConstantExpr(S.Context);
Optional<llvm::APSInt> LHSValue = LHS->getIntegerConstantExpr(S.Context);
// We don't care about expressions whose result is a constant.
if (RHSValue && LHSValue)
return AnalyzeImpConvsInComparison(S, E);
// We only care about expressions where just one side is literal
if ((bool)RHSValue ^ (bool)LHSValue) {
// Is the constant on the RHS or LHS?
const bool RhsConstant = (bool)RHSValue;
Expr *Const = RhsConstant ? RHS : LHS;
Expr *Other = RhsConstant ? LHS : RHS;
const llvm::APSInt &Value = RhsConstant ? *RHSValue : *LHSValue;
// Check whether an integer constant comparison results in a value
// of 'true' or 'false'.
if (CheckTautologicalComparison(S, E, Const, Other, Value, RhsConstant))
return AnalyzeImpConvsInComparison(S, E);
}
}
if (!T->hasUnsignedIntegerRepresentation()) {
// We don't do anything special if this isn't an unsigned integral
// comparison: we're only interested in integral comparisons, and
// signed comparisons only happen in cases we don't care to warn about.
return AnalyzeImpConvsInComparison(S, E);
}
LHS = LHS->IgnoreParenImpCasts();
RHS = RHS->IgnoreParenImpCasts();
if (!S.getLangOpts().CPlusPlus) {
// Avoid warning about comparison of integers with different signs when
// RHS/LHS has a `typeof(E)` type whose sign is different from the sign of
// the type of `E`.
if (const auto *TET = dyn_cast<TypeOfExprType>(LHS->getType()))
LHS = TET->getUnderlyingExpr()->IgnoreParenImpCasts();
if (const auto *TET = dyn_cast<TypeOfExprType>(RHS->getType()))
RHS = TET->getUnderlyingExpr()->IgnoreParenImpCasts();
}
// Check to see if one of the (unmodified) operands is of different
// signedness.
Expr *signedOperand, *unsignedOperand;
if (LHS->getType()->hasSignedIntegerRepresentation()) {
assert(!RHS->getType()->hasSignedIntegerRepresentation() &&
"unsigned comparison between two signed integer expressions?");
signedOperand = LHS;
unsignedOperand = RHS;
} else if (RHS->getType()->hasSignedIntegerRepresentation()) {
signedOperand = RHS;
unsignedOperand = LHS;
} else {
return AnalyzeImpConvsInComparison(S, E);
}
// Otherwise, calculate the effective range of the signed operand.
IntRange signedRange = GetExprRange(
S.Context, signedOperand, S.isConstantEvaluated(), /*Approximate*/ true);
// Go ahead and analyze implicit conversions in the operands. Note
// that we skip the implicit conversions on both sides.
AnalyzeImplicitConversions(S, LHS, E->getOperatorLoc());
AnalyzeImplicitConversions(S, RHS, E->getOperatorLoc());
// If the signed range is non-negative, -Wsign-compare won't fire.
if (signedRange.NonNegative)
return;
// For (in)equality comparisons, if the unsigned operand is a
// constant which cannot collide with a overflowed signed operand,
// then reinterpreting the signed operand as unsigned will not
// change the result of the comparison.
if (E->isEqualityOp()) {
unsigned comparisonWidth = S.Context.getIntWidth(T);
IntRange unsignedRange =
GetExprRange(S.Context, unsignedOperand, S.isConstantEvaluated(),
/*Approximate*/ true);
// We should never be unable to prove that the unsigned operand is
// non-negative.
assert(unsignedRange.NonNegative && "unsigned range includes negative?");
if (unsignedRange.Width < comparisonWidth)
return;
}
S.DiagRuntimeBehavior(E->getOperatorLoc(), E,
S.PDiag(diag::warn_mixed_sign_comparison)
<< LHS->getType() << RHS->getType()
<< LHS->getSourceRange() << RHS->getSourceRange());
}
/// Analyzes an attempt to assign the given value to a bitfield.
///
/// Returns true if there was something fishy about the attempt.
static bool AnalyzeBitFieldAssignment(Sema &S, FieldDecl *Bitfield, Expr *Init,
SourceLocation InitLoc) {
assert(Bitfield->isBitField());
if (Bitfield->isInvalidDecl())
return false;
// White-list bool bitfields.
QualType BitfieldType = Bitfield->getType();
if (BitfieldType->isBooleanType())
return false;
if (BitfieldType->isEnumeralType()) {
EnumDecl *BitfieldEnumDecl = BitfieldType->castAs<EnumType>()->getDecl();
// If the underlying enum type was not explicitly specified as an unsigned
// type and the enum contain only positive values, MSVC++ will cause an
// inconsistency by storing this as a signed type.
if (S.getLangOpts().CPlusPlus11 &&
!BitfieldEnumDecl->getIntegerTypeSourceInfo() &&
BitfieldEnumDecl->getNumPositiveBits() > 0 &&
BitfieldEnumDecl->getNumNegativeBits() == 0) {
S.Diag(InitLoc, diag::warn_no_underlying_type_specified_for_enum_bitfield)
<< BitfieldEnumDecl;
}
}
if (Bitfield->getType()->isBooleanType())
return false;
// Ignore value- or type-dependent expressions.
if (Bitfield->getBitWidth()->isValueDependent() ||
Bitfield->getBitWidth()->isTypeDependent() ||
Init->isValueDependent() ||
Init->isTypeDependent())
return false;
Expr *OriginalInit = Init->IgnoreParenImpCasts();
unsigned FieldWidth = Bitfield->getBitWidthValue(S.Context);
Expr::EvalResult Result;
if (!OriginalInit->EvaluateAsInt(Result, S.Context,
Expr::SE_AllowSideEffects)) {
// The RHS is not constant. If the RHS has an enum type, make sure the
// bitfield is wide enough to hold all the values of the enum without
// truncation.
if (const auto *EnumTy = OriginalInit->getType()->getAs<EnumType>()) {
EnumDecl *ED = EnumTy->getDecl();
bool SignedBitfield = BitfieldType->isSignedIntegerType();
// Enum types are implicitly signed on Windows, so check if there are any
// negative enumerators to see if the enum was intended to be signed or
// not.
bool SignedEnum = ED->getNumNegativeBits() > 0;
// Check for surprising sign changes when assigning enum values to a
// bitfield of different signedness. If the bitfield is signed and we
// have exactly the right number of bits to store this unsigned enum,
// suggest changing the enum to an unsigned type. This typically happens
// on Windows where unfixed enums always use an underlying type of 'int'.
unsigned DiagID = 0;
if (SignedEnum && !SignedBitfield) {
DiagID = diag::warn_unsigned_bitfield_assigned_signed_enum;
} else if (SignedBitfield && !SignedEnum &&
ED->getNumPositiveBits() == FieldWidth) {
DiagID = diag::warn_signed_bitfield_enum_conversion;
}
if (DiagID) {
S.Diag(InitLoc, DiagID) << Bitfield << ED;
TypeSourceInfo *TSI = Bitfield->getTypeSourceInfo();
SourceRange TypeRange =
TSI ? TSI->getTypeLoc().getSourceRange() : SourceRange();
S.Diag(Bitfield->getTypeSpecStartLoc(), diag::note_change_bitfield_sign)
<< SignedEnum << TypeRange;
}
// Compute the required bitwidth. If the enum has negative values, we need
// one more bit than the normal number of positive bits to represent the
// sign bit.
unsigned BitsNeeded = SignedEnum ? std::max(ED->getNumPositiveBits() + 1,
ED->getNumNegativeBits())
: ED->getNumPositiveBits();
// Check the bitwidth.
if (BitsNeeded > FieldWidth) {
Expr *WidthExpr = Bitfield->getBitWidth();
S.Diag(InitLoc, diag::warn_bitfield_too_small_for_enum)
<< Bitfield << ED;
S.Diag(WidthExpr->getExprLoc(), diag::note_widen_bitfield)
<< BitsNeeded << ED << WidthExpr->getSourceRange();
}
}
return false;
}
llvm::APSInt Value = Result.Val.getInt();
unsigned OriginalWidth = Value.getBitWidth();
if (!Value.isSigned() || Value.isNegative())
if (UnaryOperator *UO = dyn_cast<UnaryOperator>(OriginalInit))
if (UO->getOpcode() == UO_Minus || UO->getOpcode() == UO_Not)
OriginalWidth = Value.getMinSignedBits();
if (OriginalWidth <= FieldWidth)
return false;
// Compute the value which the bitfield will contain.
llvm::APSInt TruncatedValue = Value.trunc(FieldWidth);
TruncatedValue.setIsSigned(BitfieldType->isSignedIntegerType());
// Check whether the stored value is equal to the original value.
TruncatedValue = TruncatedValue.extend(OriginalWidth);
if (llvm::APSInt::isSameValue(Value, TruncatedValue))
return false;
// Special-case bitfields of width 1: booleans are naturally 0/1, and
// therefore don't strictly fit into a signed bitfield of width 1.
if (FieldWidth == 1 && Value == 1)
return false;
std::string PrettyValue = Value.toString(10);
std::string PrettyTrunc = TruncatedValue.toString(10);
S.Diag(InitLoc, diag::warn_impcast_bitfield_precision_constant)
<< PrettyValue << PrettyTrunc << OriginalInit->getType()
<< Init->getSourceRange();
return true;
}
/// Analyze the given simple or compound assignment for warning-worthy
/// operations.
static void AnalyzeAssignment(Sema &S, BinaryOperator *E) {
// Just recurse on the LHS.
AnalyzeImplicitConversions(S, E->getLHS(), E->getOperatorLoc());
// We want to recurse on the RHS as normal unless we're assigning to
// a bitfield.
if (FieldDecl *Bitfield = E->getLHS()->getSourceBitField()) {
if (AnalyzeBitFieldAssignment(S, Bitfield, E->getRHS(),
E->getOperatorLoc())) {
// Recurse, ignoring any implicit conversions on the RHS.
return AnalyzeImplicitConversions(S, E->getRHS()->IgnoreParenImpCasts(),
E->getOperatorLoc());
}
}
AnalyzeImplicitConversions(S, E->getRHS(), E->getOperatorLoc());
// Diagnose implicitly sequentially-consistent atomic assignment.
if (E->getLHS()->getType()->isAtomicType())
S.Diag(E->getRHS()->getBeginLoc(), diag::warn_atomic_implicit_seq_cst);
}
/// Diagnose an implicit cast; purely a helper for CheckImplicitConversion.
static void DiagnoseImpCast(Sema &S, Expr *E, QualType SourceType, QualType T,
SourceLocation CContext, unsigned diag,
bool pruneControlFlow = false) {
if (pruneControlFlow) {
S.DiagRuntimeBehavior(E->getExprLoc(), E,
S.PDiag(diag)
<< SourceType << T << E->getSourceRange()
<< SourceRange(CContext));
return;
}
S.Diag(E->getExprLoc(), diag)
<< SourceType << T << E->getSourceRange() << SourceRange(CContext);
}
/// Diagnose an implicit cast; purely a helper for CheckImplicitConversion.
static void DiagnoseImpCast(Sema &S, Expr *E, QualType T,
SourceLocation CContext,
unsigned diag, bool pruneControlFlow = false) {
DiagnoseImpCast(S, E, E->getType(), T, CContext, diag, pruneControlFlow);
}
static bool isObjCSignedCharBool(Sema &S, QualType Ty) {
return Ty->isSpecificBuiltinType(BuiltinType::SChar) &&
S.getLangOpts().ObjC && S.NSAPIObj->isObjCBOOLType(Ty);
}
static void adornObjCBoolConversionDiagWithTernaryFixit(
Sema &S, Expr *SourceExpr, const Sema::SemaDiagnosticBuilder &Builder) {
Expr *Ignored = SourceExpr->IgnoreImplicit();
if (const auto *OVE = dyn_cast<OpaqueValueExpr>(Ignored))
Ignored = OVE->getSourceExpr();
bool NeedsParens = isa<AbstractConditionalOperator>(Ignored) ||
isa<BinaryOperator>(Ignored) ||
isa<CXXOperatorCallExpr>(Ignored);
SourceLocation EndLoc = S.getLocForEndOfToken(SourceExpr->getEndLoc());
if (NeedsParens)
Builder << FixItHint::CreateInsertion(SourceExpr->getBeginLoc(), "(")
<< FixItHint::CreateInsertion(EndLoc, ")");
Builder << FixItHint::CreateInsertion(EndLoc, " ? YES : NO");
}
/// Diagnose an implicit cast from a floating point value to an integer value.
static void DiagnoseFloatingImpCast(Sema &S, Expr *E, QualType T,
SourceLocation CContext) {
const bool IsBool = T->isSpecificBuiltinType(BuiltinType::Bool);
const bool PruneWarnings = S.inTemplateInstantiation();
Expr *InnerE = E->IgnoreParenImpCasts();
// We also want to warn on, e.g., "int i = -1.234"
if (UnaryOperator *UOp = dyn_cast<UnaryOperator>(InnerE))
if (UOp->getOpcode() == UO_Minus || UOp->getOpcode() == UO_Plus)
InnerE = UOp->getSubExpr()->IgnoreParenImpCasts();
const bool IsLiteral =
isa<FloatingLiteral>(E) || isa<FloatingLiteral>(InnerE);
llvm::APFloat Value(0.0);
bool IsConstant =
E->EvaluateAsFloat(Value, S.Context, Expr::SE_AllowSideEffects);
if (!IsConstant) {
if (isObjCSignedCharBool(S, T)) {
return adornObjCBoolConversionDiagWithTernaryFixit(
S, E,
S.Diag(CContext, diag::warn_impcast_float_to_objc_signed_char_bool)
<< E->getType());
}
return DiagnoseImpCast(S, E, T, CContext,
diag::warn_impcast_float_integer, PruneWarnings);
}
bool isExact = false;
llvm::APSInt IntegerValue(S.Context.getIntWidth(T),
T->hasUnsignedIntegerRepresentation());
llvm::APFloat::opStatus Result = Value.convertToInteger(
IntegerValue, llvm::APFloat::rmTowardZero, &isExact);
// FIXME: Force the precision of the source value down so we don't print
// digits which are usually useless (we don't really care here if we
// truncate a digit by accident in edge cases). Ideally, APFloat::toString
// would automatically print the shortest representation, but it's a bit
// tricky to implement.
SmallString<16> PrettySourceValue;
unsigned precision = llvm::APFloat::semanticsPrecision(Value.getSemantics());
precision = (precision * 59 + 195) / 196;
Value.toString(PrettySourceValue, precision);
if (isObjCSignedCharBool(S, T) && IntegerValue != 0 && IntegerValue != 1) {
return adornObjCBoolConversionDiagWithTernaryFixit(
S, E,
S.Diag(CContext, diag::warn_impcast_constant_value_to_objc_bool)
<< PrettySourceValue);
}
if (Result == llvm::APFloat::opOK && isExact) {
if (IsLiteral) return;
return DiagnoseImpCast(S, E, T, CContext, diag::warn_impcast_float_integer,
PruneWarnings);
}
// Conversion of a floating-point value to a non-bool integer where the
// integral part cannot be represented by the integer type is undefined.
if (!IsBool && Result == llvm::APFloat::opInvalidOp)
return DiagnoseImpCast(
S, E, T, CContext,
IsLiteral ? diag::warn_impcast_literal_float_to_integer_out_of_range
: diag::warn_impcast_float_to_integer_out_of_range,
PruneWarnings);
unsigned DiagID = 0;
if (IsLiteral) {
// Warn on floating point literal to integer.
DiagID = diag::warn_impcast_literal_float_to_integer;
} else if (IntegerValue == 0) {
if (Value.isZero()) { // Skip -0.0 to 0 conversion.
return DiagnoseImpCast(S, E, T, CContext,
diag::warn_impcast_float_integer, PruneWarnings);
}
// Warn on non-zero to zero conversion.
DiagID = diag::warn_impcast_float_to_integer_zero;
} else {
if (IntegerValue.isUnsigned()) {
if (!IntegerValue.isMaxValue()) {
return DiagnoseImpCast(S, E, T, CContext,
diag::warn_impcast_float_integer, PruneWarnings);
}
} else { // IntegerValue.isSigned()
if (!IntegerValue.isMaxSignedValue() &&
!IntegerValue.isMinSignedValue()) {
return DiagnoseImpCast(S, E, T, CContext,
diag::warn_impcast_float_integer, PruneWarnings);
}
}
// Warn on evaluatable floating point expression to integer conversion.
DiagID = diag::warn_impcast_float_to_integer;
}
SmallString<16> PrettyTargetValue;
if (IsBool)
PrettyTargetValue = Value.isZero() ? "false" : "true";
else
IntegerValue.toString(PrettyTargetValue);
if (PruneWarnings) {
S.DiagRuntimeBehavior(E->getExprLoc(), E,
S.PDiag(DiagID)
<< E->getType() << T.getUnqualifiedType()
<< PrettySourceValue << PrettyTargetValue
<< E->getSourceRange() << SourceRange(CContext));
} else {
S.Diag(E->getExprLoc(), DiagID)
<< E->getType() << T.getUnqualifiedType() << PrettySourceValue
<< PrettyTargetValue << E->getSourceRange() << SourceRange(CContext);
}
}
/// Analyze the given compound assignment for the possible losing of
/// floating-point precision.
static void AnalyzeCompoundAssignment(Sema &S, BinaryOperator *E) {
assert(isa<CompoundAssignOperator>(E) &&
"Must be compound assignment operation");
// Recurse on the LHS and RHS in here
AnalyzeImplicitConversions(S, E->getLHS(), E->getOperatorLoc());
AnalyzeImplicitConversions(S, E->getRHS(), E->getOperatorLoc());
if (E->getLHS()->getType()->isAtomicType())
S.Diag(E->getOperatorLoc(), diag::warn_atomic_implicit_seq_cst);
// Now check the outermost expression
const auto *ResultBT = E->getLHS()->getType()->getAs<BuiltinType>();
const auto *RBT = cast<CompoundAssignOperator>(E)
->getComputationResultType()
->getAs<BuiltinType>();
// The below checks assume source is floating point.
if (!ResultBT || !RBT || !RBT->isFloatingPoint()) return;
// If source is floating point but target is an integer.
if (ResultBT->isInteger())
return DiagnoseImpCast(S, E, E->getRHS()->getType(), E->getLHS()->getType(),
E->getExprLoc(), diag::warn_impcast_float_integer);
if (!ResultBT->isFloatingPoint())
return;
// If both source and target are floating points, warn about losing precision.
int Order = S.getASTContext().getFloatingTypeSemanticOrder(
QualType(ResultBT, 0), QualType(RBT, 0));
if (Order < 0 && !S.SourceMgr.isInSystemMacro(E->getOperatorLoc()))
// warn about dropping FP rank.
DiagnoseImpCast(S, E->getRHS(), E->getLHS()->getType(), E->getOperatorLoc(),
diag::warn_impcast_float_result_precision);
}
static std::string PrettyPrintInRange(const llvm::APSInt &Value,
IntRange Range) {
if (!Range.Width) return "0";
llvm::APSInt ValueInRange = Value;
ValueInRange.setIsSigned(!Range.NonNegative);
ValueInRange = ValueInRange.trunc(Range.Width);
return ValueInRange.toString(10);
}
static bool IsImplicitBoolFloatConversion(Sema &S, Expr *Ex, bool ToBool) {
if (!isa<ImplicitCastExpr>(Ex))
return false;
Expr *InnerE = Ex->IgnoreParenImpCasts();
const Type *Target = S.Context.getCanonicalType(Ex->getType()).getTypePtr();
const Type *Source =
S.Context.getCanonicalType(InnerE->getType()).getTypePtr();
if (Target->isDependentType())
return false;
const BuiltinType *FloatCandidateBT =
dyn_cast<BuiltinType>(ToBool ? Source : Target);
const Type *BoolCandidateType = ToBool ? Target : Source;
return (BoolCandidateType->isSpecificBuiltinType(BuiltinType::Bool) &&
FloatCandidateBT && (FloatCandidateBT->isFloatingPoint()));
}
static void CheckImplicitArgumentConversions(Sema &S, CallExpr *TheCall,
SourceLocation CC) {
unsigned NumArgs = TheCall->getNumArgs();
for (unsigned i = 0; i < NumArgs; ++i) {
Expr *CurrA = TheCall->getArg(i);
if (!IsImplicitBoolFloatConversion(S, CurrA, true))
continue;
bool IsSwapped = ((i > 0) &&
IsImplicitBoolFloatConversion(S, TheCall->getArg(i - 1), false));
IsSwapped |= ((i < (NumArgs - 1)) &&
IsImplicitBoolFloatConversion(S, TheCall->getArg(i + 1), false));
if (IsSwapped) {
// Warn on this floating-point to bool conversion.
DiagnoseImpCast(S, CurrA->IgnoreParenImpCasts(),
CurrA->getType(), CC,
diag::warn_impcast_floating_point_to_bool);
}
}
}
static void DiagnoseNullConversion(Sema &S, Expr *E, QualType T,
SourceLocation CC) {
if (S.Diags.isIgnored(diag::warn_impcast_null_pointer_to_integer,
E->getExprLoc()))
return;
// Don't warn on functions which have return type nullptr_t.
if (isa<CallExpr>(E))
return;
// Check for NULL (GNUNull) or nullptr (CXX11_nullptr).
const Expr::NullPointerConstantKind NullKind =
E->isNullPointerConstant(S.Context, Expr::NPC_ValueDependentIsNotNull);
if (NullKind != Expr::NPCK_GNUNull && NullKind != Expr::NPCK_CXX11_nullptr)
return;
// Return if target type is a safe conversion.
if (T->isAnyPointerType() || T->isBlockPointerType() ||
T->isMemberPointerType() || !T->isScalarType() || T->isNullPtrType())
return;
SourceLocation Loc = E->getSourceRange().getBegin();
// Venture through the macro stacks to get to the source of macro arguments.
// The new location is a better location than the complete location that was
// passed in.
Loc = S.SourceMgr.getTopMacroCallerLoc(Loc);
CC = S.SourceMgr.getTopMacroCallerLoc(CC);
// __null is usually wrapped in a macro. Go up a macro if that is the case.
if (NullKind == Expr::NPCK_GNUNull && Loc.isMacroID()) {
StringRef MacroName = Lexer::getImmediateMacroNameForDiagnostics(
Loc, S.SourceMgr, S.getLangOpts());
if (MacroName == "NULL")
Loc = S.SourceMgr.getImmediateExpansionRange(Loc).getBegin();
}
// Only warn if the null and context location are in the same macro expansion.
if (S.SourceMgr.getFileID(Loc) != S.SourceMgr.getFileID(CC))
return;
S.Diag(Loc, diag::warn_impcast_null_pointer_to_integer)
<< (NullKind == Expr::NPCK_CXX11_nullptr) << T << SourceRange(CC)
<< FixItHint::CreateReplacement(Loc,
S.getFixItZeroLiteralForType(T, Loc));
}
static void checkObjCArrayLiteral(Sema &S, QualType TargetType,
ObjCArrayLiteral *ArrayLiteral);
static void
checkObjCDictionaryLiteral(Sema &S, QualType TargetType,
ObjCDictionaryLiteral *DictionaryLiteral);
/// Check a single element within a collection literal against the
/// target element type.
static void checkObjCCollectionLiteralElement(Sema &S,
QualType TargetElementType,
Expr *Element,
unsigned ElementKind) {
// Skip a bitcast to 'id' or qualified 'id'.
if (auto ICE = dyn_cast<ImplicitCastExpr>(Element)) {
if (ICE->getCastKind() == CK_BitCast &&
ICE->getSubExpr()->getType()->getAs<ObjCObjectPointerType>())
Element = ICE->getSubExpr();
}
QualType ElementType = Element->getType();
ExprResult ElementResult(Element);
if (ElementType->getAs<ObjCObjectPointerType>() &&
S.CheckSingleAssignmentConstraints(TargetElementType,
ElementResult,
false, false)
!= Sema::Compatible) {
S.Diag(Element->getBeginLoc(), diag::warn_objc_collection_literal_element)
<< ElementType << ElementKind << TargetElementType
<< Element->getSourceRange();
}
if (auto ArrayLiteral = dyn_cast<ObjCArrayLiteral>(Element))
checkObjCArrayLiteral(S, TargetElementType, ArrayLiteral);
else if (auto DictionaryLiteral = dyn_cast<ObjCDictionaryLiteral>(Element))
checkObjCDictionaryLiteral(S, TargetElementType, DictionaryLiteral);
}
/// Check an Objective-C array literal being converted to the given
/// target type.
static void checkObjCArrayLiteral(Sema &S, QualType TargetType,
ObjCArrayLiteral *ArrayLiteral) {
if (!S.NSArrayDecl)
return;
const auto *TargetObjCPtr = TargetType->getAs<ObjCObjectPointerType>();
if (!TargetObjCPtr)
return;
if (TargetObjCPtr->isUnspecialized() ||
TargetObjCPtr->getInterfaceDecl()->getCanonicalDecl()
!= S.NSArrayDecl->getCanonicalDecl())
return;
auto TypeArgs = TargetObjCPtr->getTypeArgs();
if (TypeArgs.size() != 1)
return;
QualType TargetElementType = TypeArgs[0];
for (unsigned I = 0, N = ArrayLiteral->getNumElements(); I != N; ++I) {
checkObjCCollectionLiteralElement(S, TargetElementType,
ArrayLiteral->getElement(I),
0);
}
}
/// Check an Objective-C dictionary literal being converted to the given
/// target type.
static void
checkObjCDictionaryLiteral(Sema &S, QualType TargetType,
ObjCDictionaryLiteral *DictionaryLiteral) {
if (!S.NSDictionaryDecl)
return;
const auto *TargetObjCPtr = TargetType->getAs<ObjCObjectPointerType>();
if (!TargetObjCPtr)
return;
if (TargetObjCPtr->isUnspecialized() ||
TargetObjCPtr->getInterfaceDecl()->getCanonicalDecl()
!= S.NSDictionaryDecl->getCanonicalDecl())
return;
auto TypeArgs = TargetObjCPtr->getTypeArgs();
if (TypeArgs.size() != 2)
return;
QualType TargetKeyType = TypeArgs[0];
QualType TargetObjectType = TypeArgs[1];
for (unsigned I = 0, N = DictionaryLiteral->getNumElements(); I != N; ++I) {
auto Element = DictionaryLiteral->getKeyValueElement(I);
checkObjCCollectionLiteralElement(S, TargetKeyType, Element.Key, 1);
checkObjCCollectionLiteralElement(S, TargetObjectType, Element.Value, 2);
}
}
// Helper function to filter out cases for constant width constant conversion.
// Don't warn on char array initialization or for non-decimal values.
static bool isSameWidthConstantConversion(Sema &S, Expr *E, QualType T,
SourceLocation CC) {
// If initializing from a constant, and the constant starts with '0',
// then it is a binary, octal, or hexadecimal. Allow these constants
// to fill all the bits, even if there is a sign change.
if (auto *IntLit = dyn_cast<IntegerLiteral>(E->IgnoreParenImpCasts())) {
const char FirstLiteralCharacter =
S.getSourceManager().getCharacterData(IntLit->getBeginLoc())[0];
if (FirstLiteralCharacter == '0')
return false;
}
// If the CC location points to a '{', and the type is char, then assume
// assume it is an array initialization.
if (CC.isValid() && T->isCharType()) {
const char FirstContextCharacter =
S.getSourceManager().getCharacterData(CC)[0];
if (FirstContextCharacter == '{')
return false;
}
return true;
}
static const IntegerLiteral *getIntegerLiteral(Expr *E) {
const auto *IL = dyn_cast<IntegerLiteral>(E);
if (!IL) {
if (auto *UO = dyn_cast<UnaryOperator>(E)) {
if (UO->getOpcode() == UO_Minus)
return dyn_cast<IntegerLiteral>(UO->getSubExpr());
}
}
return IL;
}
static void DiagnoseIntInBoolContext(Sema &S, Expr *E) {
E = E->IgnoreParenImpCasts();
SourceLocation ExprLoc = E->getExprLoc();
if (const auto *BO = dyn_cast<BinaryOperator>(E)) {
BinaryOperator::Opcode Opc = BO->getOpcode();
Expr::EvalResult Result;
// Do not diagnose unsigned shifts.
if (Opc == BO_Shl) {
const auto *LHS = getIntegerLiteral(BO->getLHS());
const auto *RHS = getIntegerLiteral(BO->getRHS());
if (LHS && LHS->getValue() == 0)
S.Diag(ExprLoc, diag::warn_left_shift_always) << 0;
else if (!E->isValueDependent() && LHS && RHS &&
RHS->getValue().isNonNegative() &&
E->EvaluateAsInt(Result, S.Context, Expr::SE_AllowSideEffects))
S.Diag(ExprLoc, diag::warn_left_shift_always)
<< (Result.Val.getInt() != 0);
else if (E->getType()->isSignedIntegerType())
S.Diag(ExprLoc, diag::warn_left_shift_in_bool_context) << E;
}
}
if (const auto *CO = dyn_cast<ConditionalOperator>(E)) {
const auto *LHS = getIntegerLiteral(CO->getTrueExpr());
const auto *RHS = getIntegerLiteral(CO->getFalseExpr());
if (!LHS || !RHS)
return;
if ((LHS->getValue() == 0 || LHS->getValue() == 1) &&
(RHS->getValue() == 0 || RHS->getValue() == 1))
// Do not diagnose common idioms.
return;
if (LHS->getValue() != 0 && RHS->getValue() != 0)
S.Diag(ExprLoc, diag::warn_integer_constants_in_conditional_always_true);
}
}
static void CheckImplicitConversion(Sema &S, Expr *E, QualType T,
SourceLocation CC,
bool *ICContext = nullptr,
bool IsListInit = false) {
if (E->isTypeDependent() || E->isValueDependent()) return;
const Type *Source = S.Context.getCanonicalType(E->getType()).getTypePtr();
const Type *Target = S.Context.getCanonicalType(T).getTypePtr();
if (Source == Target) return;
if (Target->isDependentType()) return;
// If the conversion context location is invalid don't complain. We also
// don't want to emit a warning if the issue occurs from the expansion of
// a system macro. The problem is that 'getSpellingLoc()' is slow, so we
// delay this check as long as possible. Once we detect we are in that
// scenario, we just return.
if (CC.isInvalid())
return;
if (Source->isAtomicType())
S.Diag(E->getExprLoc(), diag::warn_atomic_implicit_seq_cst);
// Diagnose implicit casts to bool.
if (Target->isSpecificBuiltinType(BuiltinType::Bool)) {
if (isa<StringLiteral>(E))
// Warn on string literal to bool. Checks for string literals in logical
// and expressions, for instance, assert(0 && "error here"), are
// prevented by a check in AnalyzeImplicitConversions().
return DiagnoseImpCast(S, E, T, CC,
diag::warn_impcast_string_literal_to_bool);
if (isa<ObjCStringLiteral>(E) || isa<ObjCArrayLiteral>(E) ||
isa<ObjCDictionaryLiteral>(E) || isa<ObjCBoxedExpr>(E)) {
// This covers the literal expressions that evaluate to Objective-C
// objects.
return DiagnoseImpCast(S, E, T, CC,
diag::warn_impcast_objective_c_literal_to_bool);
}
if (Source->isPointerType() || Source->canDecayToPointerType()) {
// Warn on pointer to bool conversion that is always true.
S.DiagnoseAlwaysNonNullPointer(E, Expr::NPCK_NotNull, /*IsEqual*/ false,
SourceRange(CC));
}
}
// If the we're converting a constant to an ObjC BOOL on a platform where BOOL
// is a typedef for signed char (macOS), then that constant value has to be 1
// or 0.
if (isObjCSignedCharBool(S, T) && Source->isIntegralType(S.Context)) {
Expr::EvalResult Result;
if (E->EvaluateAsInt(Result, S.getASTContext(),
Expr::SE_AllowSideEffects)) {
if (Result.Val.getInt() != 1 && Result.Val.getInt() != 0) {
adornObjCBoolConversionDiagWithTernaryFixit(
S, E,
S.Diag(CC, diag::warn_impcast_constant_value_to_objc_bool)
<< Result.Val.getInt().toString(10));
}
return;
}
}
// Check implicit casts from Objective-C collection literals to specialized
// collection types, e.g., NSArray<NSString *> *.
if (auto *ArrayLiteral = dyn_cast<ObjCArrayLiteral>(E))
checkObjCArrayLiteral(S, QualType(Target, 0), ArrayLiteral);
else if (auto *DictionaryLiteral = dyn_cast<ObjCDictionaryLiteral>(E))
checkObjCDictionaryLiteral(S, QualType(Target, 0), DictionaryLiteral);
// Strip vector types.
if (isa<VectorType>(Source)) {
if (!isa<VectorType>(Target)) {
if (S.SourceMgr.isInSystemMacro(CC))
return;
return DiagnoseImpCast(S, E, T, CC, diag::warn_impcast_vector_scalar);
}
// If the vector cast is cast between two vectors of the same size, it is
// a bitcast, not a conversion.
if (S.Context.getTypeSize(Source) == S.Context.getTypeSize(Target))
return;
Source = cast<VectorType>(Source)->getElementType().getTypePtr();
Target = cast<VectorType>(Target)->getElementType().getTypePtr();
}
if (auto VecTy = dyn_cast<VectorType>(Target))
Target = VecTy->getElementType().getTypePtr();
// Strip complex types.
if (isa<ComplexType>(Source)) {
if (!isa<ComplexType>(Target)) {
if (S.SourceMgr.isInSystemMacro(CC) || Target->isBooleanType())
return;
return DiagnoseImpCast(S, E, T, CC,
S.getLangOpts().CPlusPlus
? diag::err_impcast_complex_scalar
: diag::warn_impcast_complex_scalar);
}
Source = cast<ComplexType>(Source)->getElementType().getTypePtr();
Target = cast<ComplexType>(Target)->getElementType().getTypePtr();
}
const BuiltinType *SourceBT = dyn_cast<BuiltinType>(Source);
const BuiltinType *TargetBT = dyn_cast<BuiltinType>(Target);
// If the source is floating point...
if (SourceBT && SourceBT->isFloatingPoint()) {
// ...and the target is floating point...
if (TargetBT && TargetBT->isFloatingPoint()) {
// ...then warn if we're dropping FP rank.
int Order = S.getASTContext().getFloatingTypeSemanticOrder(
QualType(SourceBT, 0), QualType(TargetBT, 0));
if (Order > 0) {
// Don't warn about float constants that are precisely
// representable in the target type.
Expr::EvalResult result;
if (E->EvaluateAsRValue(result, S.Context)) {
// Value might be a float, a float vector, or a float complex.
if (IsSameFloatAfterCast(result.Val,
S.Context.getFloatTypeSemantics(QualType(TargetBT, 0)),
S.Context.getFloatTypeSemantics(QualType(SourceBT, 0))))
return;
}
if (S.SourceMgr.isInSystemMacro(CC))
return;
DiagnoseImpCast(S, E, T, CC, diag::warn_impcast_float_precision);
}
// ... or possibly if we're increasing rank, too
else if (Order < 0) {
if (S.SourceMgr.isInSystemMacro(CC))
return;
DiagnoseImpCast(S, E, T, CC, diag::warn_impcast_double_promotion);
}
return;
}
// If the target is integral, always warn.
if (TargetBT && TargetBT->isInteger()) {
if (S.SourceMgr.isInSystemMacro(CC))
return;
DiagnoseFloatingImpCast(S, E, T, CC);
}
// Detect the case where a call result is converted from floating-point to
// to bool, and the final argument to the call is converted from bool, to
// discover this typo:
//
// bool b = fabs(x < 1.0); // should be "bool b = fabs(x) < 1.0;"
//
// FIXME: This is an incredibly special case; is there some more general
// way to detect this class of misplaced-parentheses bug?
if (Target->isBooleanType() && isa<CallExpr>(E)) {
// Check last argument of function call to see if it is an
// implicit cast from a type matching the type the result
// is being cast to.
CallExpr *CEx = cast<CallExpr>(E);
if (unsigned NumArgs = CEx->getNumArgs()) {
Expr *LastA = CEx->getArg(NumArgs - 1);
Expr *InnerE = LastA->IgnoreParenImpCasts();
if (isa<ImplicitCastExpr>(LastA) &&
InnerE->getType()->isBooleanType()) {
// Warn on this floating-point to bool conversion
DiagnoseImpCast(S, E, T, CC,
diag::warn_impcast_floating_point_to_bool);
}
}
}
return;
}
// Valid casts involving fixed point types should be accounted for here.
if (Source->isFixedPointType()) {
if (Target->isUnsaturatedFixedPointType()) {
Expr::EvalResult Result;
if (E->EvaluateAsFixedPoint(Result, S.Context, Expr::SE_AllowSideEffects,
S.isConstantEvaluated())) {
llvm::APFixedPoint Value = Result.Val.getFixedPoint();
llvm::APFixedPoint MaxVal = S.Context.getFixedPointMax(T);
llvm::APFixedPoint MinVal = S.Context.getFixedPointMin(T);
if (Value > MaxVal || Value < MinVal) {
S.DiagRuntimeBehavior(E->getExprLoc(), E,
S.PDiag(diag::warn_impcast_fixed_point_range)
<< Value.toString() << T
<< E->getSourceRange()
<< clang::SourceRange(CC));
return;
}
}
} else if (Target->isIntegerType()) {
Expr::EvalResult Result;
if (!S.isConstantEvaluated() &&
E->EvaluateAsFixedPoint(Result, S.Context,
Expr::SE_AllowSideEffects)) {
llvm::APFixedPoint FXResult = Result.Val.getFixedPoint();
bool Overflowed;
llvm::APSInt IntResult = FXResult.convertToInt(
S.Context.getIntWidth(T),
Target->isSignedIntegerOrEnumerationType(), &Overflowed);
if (Overflowed) {
S.DiagRuntimeBehavior(E->getExprLoc(), E,
S.PDiag(diag::warn_impcast_fixed_point_range)
<< FXResult.toString() << T
<< E->getSourceRange()
<< clang::SourceRange(CC));
return;
}
}
}
} else if (Target->isUnsaturatedFixedPointType()) {
if (Source->isIntegerType()) {
Expr::EvalResult Result;
if (!S.isConstantEvaluated() &&
E->EvaluateAsInt(Result, S.Context, Expr::SE_AllowSideEffects)) {
llvm::APSInt Value = Result.Val.getInt();
bool Overflowed;
llvm::APFixedPoint IntResult = llvm::APFixedPoint::getFromIntValue(
Value, S.Context.getFixedPointSemantics(T), &Overflowed);
if (Overflowed) {
S.DiagRuntimeBehavior(E->getExprLoc(), E,
S.PDiag(diag::warn_impcast_fixed_point_range)
<< Value.toString(/*Radix=*/10) << T
<< E->getSourceRange()
<< clang::SourceRange(CC));
return;
}
}
}
}
// If we are casting an integer type to a floating point type without
// initialization-list syntax, we might lose accuracy if the floating
// point type has a narrower significand than the integer type.
if (SourceBT && TargetBT && SourceBT->isIntegerType() &&
TargetBT->isFloatingType() && !IsListInit) {
// Determine the number of precision bits in the source integer type.
IntRange SourceRange = GetExprRange(S.Context, E, S.isConstantEvaluated(),
/*Approximate*/ true);
unsigned int SourcePrecision = SourceRange.Width;
// Determine the number of precision bits in the
// target floating point type.
unsigned int TargetPrecision = llvm::APFloatBase::semanticsPrecision(
S.Context.getFloatTypeSemantics(QualType(TargetBT, 0)));
if (SourcePrecision > 0 && TargetPrecision > 0 &&
SourcePrecision > TargetPrecision) {
if (Optional<llvm::APSInt> SourceInt =
E->getIntegerConstantExpr(S.Context)) {
// If the source integer is a constant, convert it to the target
// floating point type. Issue a warning if the value changes
// during the whole conversion.
llvm::APFloat TargetFloatValue(
S.Context.getFloatTypeSemantics(QualType(TargetBT, 0)));
llvm::APFloat::opStatus ConversionStatus =
TargetFloatValue.convertFromAPInt(
*SourceInt, SourceBT->isSignedInteger(),
llvm::APFloat::rmNearestTiesToEven);
if (ConversionStatus != llvm::APFloat::opOK) {
std::string PrettySourceValue = SourceInt->toString(10);
SmallString<32> PrettyTargetValue;
TargetFloatValue.toString(PrettyTargetValue, TargetPrecision);
S.DiagRuntimeBehavior(
E->getExprLoc(), E,
S.PDiag(diag::warn_impcast_integer_float_precision_constant)
<< PrettySourceValue << PrettyTargetValue << E->getType() << T
<< E->getSourceRange() << clang::SourceRange(CC));
}
} else {
// Otherwise, the implicit conversion may lose precision.
DiagnoseImpCast(S, E, T, CC,
diag::warn_impcast_integer_float_precision);
}
}
}
DiagnoseNullConversion(S, E, T, CC);
S.DiscardMisalignedMemberAddress(Target, E);
if (Target->isBooleanType())
DiagnoseIntInBoolContext(S, E);
if (!Source->isIntegerType() || !Target->isIntegerType())
return;
// TODO: remove this early return once the false positives for constant->bool
// in templates, macros, etc, are reduced or removed.
if (Target->isSpecificBuiltinType(BuiltinType::Bool))
return;
if (isObjCSignedCharBool(S, T) && !Source->isCharType() &&
!E->isKnownToHaveBooleanValue(/*Semantic=*/false)) {
return adornObjCBoolConversionDiagWithTernaryFixit(
S, E,
S.Diag(CC, diag::warn_impcast_int_to_objc_signed_char_bool)
<< E->getType());
}
IntRange SourceTypeRange =
IntRange::forTargetOfCanonicalType(S.Context, Source);
IntRange LikelySourceRange =
GetExprRange(S.Context, E, S.isConstantEvaluated(), /*Approximate*/ true);
IntRange TargetRange = IntRange::forTargetOfCanonicalType(S.Context, Target);
if (LikelySourceRange.Width > TargetRange.Width) {
// If the source is a constant, use a default-on diagnostic.
// TODO: this should happen for bitfield stores, too.
Expr::EvalResult Result;
if (E->EvaluateAsInt(Result, S.Context, Expr::SE_AllowSideEffects,
S.isConstantEvaluated())) {
llvm::APSInt Value(32);
Value = Result.Val.getInt();
if (S.SourceMgr.isInSystemMacro(CC))
return;
std::string PrettySourceValue = Value.toString(10);
std::string PrettyTargetValue = PrettyPrintInRange(Value, TargetRange);
S.DiagRuntimeBehavior(
E->getExprLoc(), E,
S.PDiag(diag::warn_impcast_integer_precision_constant)
<< PrettySourceValue << PrettyTargetValue << E->getType() << T
<< E->getSourceRange() << SourceRange(CC));
return;
}
// People want to build with -Wshorten-64-to-32 and not -Wconversion.
if (S.SourceMgr.isInSystemMacro(CC))
return;
if (TargetRange.Width == 32 && S.Context.getIntWidth(E->getType()) == 64)
return DiagnoseImpCast(S, E, T, CC, diag::warn_impcast_integer_64_32,
/* pruneControlFlow */ true);
return DiagnoseImpCast(S, E, T, CC, diag::warn_impcast_integer_precision);
}
if (TargetRange.Width > SourceTypeRange.Width) {
if (auto *UO = dyn_cast<UnaryOperator>(E))
if (UO->getOpcode() == UO_Minus)
if (Source->isUnsignedIntegerType()) {
if (Target->isUnsignedIntegerType())
return DiagnoseImpCast(S, E, T, CC,
diag::warn_impcast_high_order_zero_bits);
if (Target->isSignedIntegerType())
return DiagnoseImpCast(S, E, T, CC,
diag::warn_impcast_nonnegative_result);
}
}
if (TargetRange.Width == LikelySourceRange.Width &&
!TargetRange.NonNegative && LikelySourceRange.NonNegative &&
Source->isSignedIntegerType()) {
// Warn when doing a signed to signed conversion, warn if the positive
// source value is exactly the width of the target type, which will
// cause a negative value to be stored.
Expr::EvalResult Result;
if (E->EvaluateAsInt(Result, S.Context, Expr::SE_AllowSideEffects) &&
!S.SourceMgr.isInSystemMacro(CC)) {
llvm::APSInt Value = Result.Val.getInt();
if (isSameWidthConstantConversion(S, E, T, CC)) {
std::string PrettySourceValue = Value.toString(10);
std::string PrettyTargetValue = PrettyPrintInRange(Value, TargetRange);
S.DiagRuntimeBehavior(
E->getExprLoc(), E,
S.PDiag(diag::warn_impcast_integer_precision_constant)
<< PrettySourceValue << PrettyTargetValue << E->getType() << T
<< E->getSourceRange() << SourceRange(CC));
return;
}
}
// Fall through for non-constants to give a sign conversion warning.
}
if ((TargetRange.NonNegative && !LikelySourceRange.NonNegative) ||
(!TargetRange.NonNegative && LikelySourceRange.NonNegative &&
LikelySourceRange.Width == TargetRange.Width)) {
if (S.SourceMgr.isInSystemMacro(CC))
return;
unsigned DiagID = diag::warn_impcast_integer_sign;
// Traditionally, gcc has warned about this under -Wsign-compare.
// We also want to warn about it in -Wconversion.
// So if -Wconversion is off, use a completely identical diagnostic
// in the sign-compare group.
// The conditional-checking code will
if (ICContext) {
DiagID = diag::warn_impcast_integer_sign_conditional;
*ICContext = true;
}
return DiagnoseImpCast(S, E, T, CC, DiagID);
}
// Diagnose conversions between different enumeration types.
// In C, we pretend that the type of an EnumConstantDecl is its enumeration
// type, to give us better diagnostics.
QualType SourceType = E->getType();
if (!S.getLangOpts().CPlusPlus) {
if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E))
if (EnumConstantDecl *ECD = dyn_cast<EnumConstantDecl>(DRE->getDecl())) {
EnumDecl *Enum = cast<EnumDecl>(ECD->getDeclContext());
SourceType = S.Context.getTypeDeclType(Enum);
Source = S.Context.getCanonicalType(SourceType).getTypePtr();
}
}
if (const EnumType *SourceEnum = Source->getAs<EnumType>())
if (const EnumType *TargetEnum = Target->getAs<EnumType>())
if (SourceEnum->getDecl()->hasNameForLinkage() &&
TargetEnum->getDecl()->hasNameForLinkage() &&
SourceEnum != TargetEnum) {
if (S.SourceMgr.isInSystemMacro(CC))
return;
return DiagnoseImpCast(S, E, SourceType, T, CC,
diag::warn_impcast_different_enum_types);
}
}
static void CheckConditionalOperator(Sema &S, AbstractConditionalOperator *E,
SourceLocation CC, QualType T);
static void CheckConditionalOperand(Sema &S, Expr *E, QualType T,
SourceLocation CC, bool &ICContext) {
E = E->IgnoreParenImpCasts();
if (auto *CO = dyn_cast<AbstractConditionalOperator>(E))
return CheckConditionalOperator(S, CO, CC, T);
AnalyzeImplicitConversions(S, E, CC);
if (E->getType() != T)
return CheckImplicitConversion(S, E, T, CC, &ICContext);
}
static void CheckConditionalOperator(Sema &S, AbstractConditionalOperator *E,
SourceLocation CC, QualType T) {
AnalyzeImplicitConversions(S, E->getCond(), E->getQuestionLoc());
Expr *TrueExpr = E->getTrueExpr();
if (auto *BCO = dyn_cast<BinaryConditionalOperator>(E))
TrueExpr = BCO->getCommon();
bool Suspicious = false;
CheckConditionalOperand(S, TrueExpr, T, CC, Suspicious);
CheckConditionalOperand(S, E->getFalseExpr(), T, CC, Suspicious);
if (T->isBooleanType())
DiagnoseIntInBoolContext(S, E);
// If -Wconversion would have warned about either of the candidates
// for a signedness conversion to the context type...
if (!Suspicious) return;
// ...but it's currently ignored...
if (!S.Diags.isIgnored(diag::warn_impcast_integer_sign_conditional, CC))
return;
// ...then check whether it would have warned about either of the
// candidates for a signedness conversion to the condition type.
if (E->getType() == T) return;
Suspicious = false;
CheckImplicitConversion(S, TrueExpr->IgnoreParenImpCasts(),
E->getType(), CC, &Suspicious);
if (!Suspicious)
CheckImplicitConversion(S, E->getFalseExpr()->IgnoreParenImpCasts(),
E->getType(), CC, &Suspicious);
}
/// Check conversion of given expression to boolean.
/// Input argument E is a logical expression.
static void CheckBoolLikeConversion(Sema &S, Expr *E, SourceLocation CC) {
if (S.getLangOpts().Bool)
return;
if (E->IgnoreParenImpCasts()->getType()->isAtomicType())
return;
CheckImplicitConversion(S, E->IgnoreParenImpCasts(), S.Context.BoolTy, CC);
}
namespace {
struct AnalyzeImplicitConversionsWorkItem {
Expr *E;
SourceLocation CC;
bool IsListInit;
};
}
/// Data recursive variant of AnalyzeImplicitConversions. Subexpressions
/// that should be visited are added to WorkList.
static void AnalyzeImplicitConversions(
Sema &S, AnalyzeImplicitConversionsWorkItem Item,
llvm::SmallVectorImpl<AnalyzeImplicitConversionsWorkItem> &WorkList) {
Expr *OrigE = Item.E;
SourceLocation CC = Item.CC;
QualType T = OrigE->getType();
Expr *E = OrigE->IgnoreParenImpCasts();
// Propagate whether we are in a C++ list initialization expression.
// If so, we do not issue warnings for implicit int-float conversion
// precision loss, because C++11 narrowing already handles it.
bool IsListInit = Item.IsListInit ||
(isa<InitListExpr>(OrigE) && S.getLangOpts().CPlusPlus);
if (E->isTypeDependent() || E->isValueDependent())
return;
Expr *SourceExpr = E;
// Examine, but don't traverse into the source expression of an
// OpaqueValueExpr, since it may have multiple parents and we don't want to
// emit duplicate diagnostics. Its fine to examine the form or attempt to
// evaluate it in the context of checking the specific conversion to T though.
if (auto *OVE = dyn_cast<OpaqueValueExpr>(E))
if (auto *Src = OVE->getSourceExpr())
SourceExpr = Src;
if (const auto *UO = dyn_cast<UnaryOperator>(SourceExpr))
if (UO->getOpcode() == UO_Not &&
UO->getSubExpr()->isKnownToHaveBooleanValue())
S.Diag(UO->getBeginLoc(), diag::warn_bitwise_negation_bool)
<< OrigE->getSourceRange() << T->isBooleanType()
<< FixItHint::CreateReplacement(UO->getBeginLoc(), "!");
// For conditional operators, we analyze the arguments as if they
// were being fed directly into the output.
if (auto *CO = dyn_cast<AbstractConditionalOperator>(SourceExpr)) {
CheckConditionalOperator(S, CO, CC, T);
return;
}
// Check implicit argument conversions for function calls.
if (CallExpr *Call = dyn_cast<CallExpr>(SourceExpr))
CheckImplicitArgumentConversions(S, Call, CC);
// Go ahead and check any implicit conversions we might have skipped.
// The non-canonical typecheck is just an optimization;
// CheckImplicitConversion will filter out dead implicit conversions.
if (SourceExpr->getType() != T)
CheckImplicitConversion(S, SourceExpr, T, CC, nullptr, IsListInit);
// Now continue drilling into this expression.
if (PseudoObjectExpr *POE = dyn_cast<PseudoObjectExpr>(E)) {
// The bound subexpressions in a PseudoObjectExpr are not reachable
// as transitive children.
// FIXME: Use a more uniform representation for this.
for (auto *SE : POE->semantics())
if (auto *OVE = dyn_cast<OpaqueValueExpr>(SE))
WorkList.push_back({OVE->getSourceExpr(), CC, IsListInit});
}
// Skip past explicit casts.
if (auto *CE = dyn_cast<ExplicitCastExpr>(E)) {
E = CE->getSubExpr()->IgnoreParenImpCasts();
if (!CE->getType()->isVoidType() && E->getType()->isAtomicType())
S.Diag(E->getBeginLoc(), diag::warn_atomic_implicit_seq_cst);
WorkList.push_back({E, CC, IsListInit});
return;
}
if (BinaryOperator *BO = dyn_cast<BinaryOperator>(E)) {
// Do a somewhat different check with comparison operators.
if (BO->isComparisonOp())
return AnalyzeComparison(S, BO);
// And with simple assignments.
if (BO->getOpcode() == BO_Assign)
return AnalyzeAssignment(S, BO);
// And with compound assignments.
if (BO->isAssignmentOp())
return AnalyzeCompoundAssignment(S, BO);
}
// These break the otherwise-useful invariant below. Fortunately,
// we don't really need to recurse into them, because any internal
// expressions should have been analyzed already when they were
// built into statements.
if (isa<StmtExpr>(E)) return;
// Don't descend into unevaluated contexts.
if (isa<UnaryExprOrTypeTraitExpr>(E)) return;
// Now just recurse over the expression's children.
CC = E->getExprLoc();
BinaryOperator *BO = dyn_cast<BinaryOperator>(E);
bool IsLogicalAndOperator = BO && BO->getOpcode() == BO_LAnd;
for (Stmt *SubStmt : E->children()) {
Expr *ChildExpr = dyn_cast_or_null<Expr>(SubStmt);
if (!ChildExpr)
continue;
if (IsLogicalAndOperator &&
isa<StringLiteral>(ChildExpr->IgnoreParenImpCasts()))
// Ignore checking string literals that are in logical and operators.
// This is a common pattern for asserts.
continue;
WorkList.push_back({ChildExpr, CC, IsListInit});
}
if (BO && BO->isLogicalOp()) {
Expr *SubExpr = BO->getLHS()->IgnoreParenImpCasts();
if (!IsLogicalAndOperator || !isa<StringLiteral>(SubExpr))
::CheckBoolLikeConversion(S, SubExpr, BO->getExprLoc());
SubExpr = BO->getRHS()->IgnoreParenImpCasts();
if (!IsLogicalAndOperator || !isa<StringLiteral>(SubExpr))
::CheckBoolLikeConversion(S, SubExpr, BO->getExprLoc());
}
if (const UnaryOperator *U = dyn_cast<UnaryOperator>(E)) {
if (U->getOpcode() == UO_LNot) {
::CheckBoolLikeConversion(S, U->getSubExpr(), CC);
} else if (U->getOpcode() != UO_AddrOf) {
if (U->getSubExpr()->getType()->isAtomicType())
S.Diag(U->getSubExpr()->getBeginLoc(),
diag::warn_atomic_implicit_seq_cst);
}
}
}
/// AnalyzeImplicitConversions - Find and report any interesting
/// implicit conversions in the given expression. There are a couple
/// of competing diagnostics here, -Wconversion and -Wsign-compare.
static void AnalyzeImplicitConversions(Sema &S, Expr *OrigE, SourceLocation CC,
bool IsListInit/*= false*/) {
llvm::SmallVector<AnalyzeImplicitConversionsWorkItem, 16> WorkList;
WorkList.push_back({OrigE, CC, IsListInit});
while (!WorkList.empty())
AnalyzeImplicitConversions(S, WorkList.pop_back_val(), WorkList);
}
/// Diagnose integer type and any valid implicit conversion to it.
static bool checkOpenCLEnqueueIntType(Sema &S, Expr *E, const QualType &IntT) {
// Taking into account implicit conversions,
// allow any integer.
if (!E->getType()->isIntegerType()) {
S.Diag(E->getBeginLoc(),
diag::err_opencl_enqueue_kernel_invalid_local_size_type);
return true;
}
// Potentially emit standard warnings for implicit conversions if enabled
// using -Wconversion.
CheckImplicitConversion(S, E, IntT, E->getBeginLoc());
return false;
}
// Helper function for Sema::DiagnoseAlwaysNonNullPointer.
// Returns true when emitting a warning about taking the address of a reference.
static bool CheckForReference(Sema &SemaRef, const Expr *E,
const PartialDiagnostic &PD) {
E = E->IgnoreParenImpCasts();
const FunctionDecl *FD = nullptr;
if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E)) {
if (!DRE->getDecl()->getType()->isReferenceType())
return false;
} else if (const MemberExpr *M = dyn_cast<MemberExpr>(E)) {
if (!M->getMemberDecl()->getType()->isReferenceType())
return false;
} else if (const CallExpr *Call = dyn_cast<CallExpr>(E)) {
if (!Call->getCallReturnType(SemaRef.Context)->isReferenceType())
return false;
FD = Call->getDirectCallee();
} else {
return false;
}
SemaRef.Diag(E->getExprLoc(), PD);
// If possible, point to location of function.
if (FD) {
SemaRef.Diag(FD->getLocation(), diag::note_reference_is_return_value) << FD;
}
return true;
}
// Returns true if the SourceLocation is expanded from any macro body.
// Returns false if the SourceLocation is invalid, is from not in a macro
// expansion, or is from expanded from a top-level macro argument.
static bool IsInAnyMacroBody(const SourceManager &SM, SourceLocation Loc) {
if (Loc.isInvalid())
return false;
while (Loc.isMacroID()) {
if (SM.isMacroBodyExpansion(Loc))
return true;
Loc = SM.getImmediateMacroCallerLoc(Loc);
}
return false;
}
/// Diagnose pointers that are always non-null.
/// \param E the expression containing the pointer
/// \param NullKind NPCK_NotNull if E is a cast to bool, otherwise, E is
/// compared to a null pointer
/// \param IsEqual True when the comparison is equal to a null pointer
/// \param Range Extra SourceRange to highlight in the diagnostic
void Sema::DiagnoseAlwaysNonNullPointer(Expr *E,
Expr::NullPointerConstantKind NullKind,
bool IsEqual, SourceRange Range) {
if (!E)
return;
// Don't warn inside macros.
if (E->getExprLoc().isMacroID()) {
const SourceManager &SM = getSourceManager();
if (IsInAnyMacroBody(SM, E->getExprLoc()) ||
IsInAnyMacroBody(SM, Range.getBegin()))
return;
}
E = E->IgnoreImpCasts();
const bool IsCompare = NullKind != Expr::NPCK_NotNull;
if (isa<CXXThisExpr>(E)) {
unsigned DiagID = IsCompare ? diag::warn_this_null_compare
: diag::warn_this_bool_conversion;
Diag(E->getExprLoc(), DiagID) << E->getSourceRange() << Range << IsEqual;
return;
}
bool IsAddressOf = false;
if (UnaryOperator *UO = dyn_cast<UnaryOperator>(E)) {
if (UO->getOpcode() != UO_AddrOf)
return;
IsAddressOf = true;
E = UO->getSubExpr();
}
if (IsAddressOf) {
unsigned DiagID = IsCompare
? diag::warn_address_of_reference_null_compare
: diag::warn_address_of_reference_bool_conversion;
PartialDiagnostic PD = PDiag(DiagID) << E->getSourceRange() << Range
<< IsEqual;
if (CheckForReference(*this, E, PD)) {
return;
}
}
auto ComplainAboutNonnullParamOrCall = [&](const Attr *NonnullAttr) {
bool IsParam = isa<NonNullAttr>(NonnullAttr);
std::string Str;
llvm::raw_string_ostream S(Str);
E->printPretty(S, nullptr, getPrintingPolicy());
unsigned DiagID = IsCompare ? diag::warn_nonnull_expr_compare
: diag::warn_cast_nonnull_to_bool;
Diag(E->getExprLoc(), DiagID) << IsParam << S.str()
<< E->getSourceRange() << Range << IsEqual;
Diag(NonnullAttr->getLocation(), diag::note_declared_nonnull) << IsParam;
};
// If we have a CallExpr that is tagged with returns_nonnull, we can complain.
if (auto *Call = dyn_cast<CallExpr>(E->IgnoreParenImpCasts())) {
if (auto *Callee = Call->getDirectCallee()) {
if (const Attr *A = Callee->getAttr<ReturnsNonNullAttr>()) {
ComplainAboutNonnullParamOrCall(A);
return;
}
}
}
// Expect to find a single Decl. Skip anything more complicated.
ValueDecl *D = nullptr;
if (DeclRefExpr *R = dyn_cast<DeclRefExpr>(E)) {
D = R->getDecl();
} else if (MemberExpr *M = dyn_cast<MemberExpr>(E)) {
D = M->getMemberDecl();
}
// Weak Decls can be null.
if (!D || D->isWeak())
return;
// Check for parameter decl with nonnull attribute
if (const auto* PV = dyn_cast<ParmVarDecl>(D)) {
if (getCurFunction() &&
!getCurFunction()->ModifiedNonNullParams.count(PV)) {
if (const Attr *A = PV->getAttr<NonNullAttr>()) {
ComplainAboutNonnullParamOrCall(A);
return;
}
if (const auto *FD = dyn_cast<FunctionDecl>(PV->getDeclContext())) {
// Skip function template not specialized yet.
if (FD->getTemplatedKind() == FunctionDecl::TK_FunctionTemplate)
return;
auto ParamIter = llvm::find(FD->parameters(), PV);
assert(ParamIter != FD->param_end());
unsigned ParamNo = std::distance(FD->param_begin(), ParamIter);
for (const auto *NonNull : FD->specific_attrs<NonNullAttr>()) {
if (!NonNull->args_size()) {
ComplainAboutNonnullParamOrCall(NonNull);
return;
}
for (const ParamIdx &ArgNo : NonNull->args()) {
if (ArgNo.getASTIndex() == ParamNo) {
ComplainAboutNonnullParamOrCall(NonNull);
return;
}
}
}
}
}
}
QualType T = D->getType();
const bool IsArray = T->isArrayType();
const bool IsFunction = T->isFunctionType();
// Address of function is used to silence the function warning.
if (IsAddressOf && IsFunction) {
return;
}
// Found nothing.
if (!IsAddressOf && !IsFunction && !IsArray)
return;
// Pretty print the expression for the diagnostic.
std::string Str;
llvm::raw_string_ostream S(Str);
E->printPretty(S, nullptr, getPrintingPolicy());
unsigned DiagID = IsCompare ? diag::warn_null_pointer_compare
: diag::warn_impcast_pointer_to_bool;
enum {
AddressOf,
FunctionPointer,
ArrayPointer
} DiagType;
if (IsAddressOf)
DiagType = AddressOf;
else if (IsFunction)
DiagType = FunctionPointer;
else if (IsArray)
DiagType = ArrayPointer;
else
llvm_unreachable("Could not determine diagnostic.");
Diag(E->getExprLoc(), DiagID) << DiagType << S.str() << E->getSourceRange()
<< Range << IsEqual;
if (!IsFunction)
return;
// Suggest '&' to silence the function warning.
Diag(E->getExprLoc(), diag::note_function_warning_silence)
<< FixItHint::CreateInsertion(E->getBeginLoc(), "&");
// Check to see if '()' fixit should be emitted.
QualType ReturnType;
UnresolvedSet<4> NonTemplateOverloads;
tryExprAsCall(*E, ReturnType, NonTemplateOverloads);
if (ReturnType.isNull())
return;
if (IsCompare) {
// There are two cases here. If there is null constant, the only suggest
// for a pointer return type. If the null is 0, then suggest if the return
// type is a pointer or an integer type.
if (!ReturnType->isPointerType()) {
if (NullKind == Expr::NPCK_ZeroExpression ||
NullKind == Expr::NPCK_ZeroLiteral) {
if (!ReturnType->isIntegerType())
return;
} else {
return;
}
}
} else { // !IsCompare
// For function to bool, only suggest if the function pointer has bool
// return type.
if (!ReturnType->isSpecificBuiltinType(BuiltinType::Bool))
return;
}
Diag(E->getExprLoc(), diag::note_function_to_function_call)
<< FixItHint::CreateInsertion(getLocForEndOfToken(E->getEndLoc()), "()");
}
/// Diagnoses "dangerous" implicit conversions within the given
/// expression (which is a full expression). Implements -Wconversion
/// and -Wsign-compare.
///
/// \param CC the "context" location of the implicit conversion, i.e.
/// the most location of the syntactic entity requiring the implicit
/// conversion
void Sema::CheckImplicitConversions(Expr *E, SourceLocation CC) {
// Don't diagnose in unevaluated contexts.
if (isUnevaluatedContext())
return;
// Don't diagnose for value- or type-dependent expressions.
if (E->isTypeDependent() || E->isValueDependent())
return;
// Check for array bounds violations in cases where the check isn't triggered
// elsewhere for other Expr types (like BinaryOperators), e.g. when an
// ArraySubscriptExpr is on the RHS of a variable initialization.
CheckArrayAccess(E);
// This is not the right CC for (e.g.) a variable initialization.
AnalyzeImplicitConversions(*this, E, CC);
}
/// CheckBoolLikeConversion - Check conversion of given expression to boolean.
/// Input argument E is a logical expression.
void Sema::CheckBoolLikeConversion(Expr *E, SourceLocation CC) {
::CheckBoolLikeConversion(*this, E, CC);
}
/// Diagnose when expression is an integer constant expression and its evaluation
/// results in integer overflow
void Sema::CheckForIntOverflow (Expr *E) {
// Use a work list to deal with nested struct initializers.
SmallVector<Expr *, 2> Exprs(1, E);
do {
Expr *OriginalE = Exprs.pop_back_val();
Expr *E = OriginalE->IgnoreParenCasts();
if (isa<BinaryOperator>(E)) {
E->EvaluateForOverflow(Context);
continue;
}
if (auto InitList = dyn_cast<InitListExpr>(OriginalE))
Exprs.append(InitList->inits().begin(), InitList->inits().end());
else if (isa<ObjCBoxedExpr>(OriginalE))
E->EvaluateForOverflow(Context);
else if (auto Call = dyn_cast<CallExpr>(E))
Exprs.append(Call->arg_begin(), Call->arg_end());
else if (auto Message = dyn_cast<ObjCMessageExpr>(E))
Exprs.append(Message->arg_begin(), Message->arg_end());
} while (!Exprs.empty());
}
namespace {
/// Visitor for expressions which looks for unsequenced operations on the
/// same object.
class SequenceChecker : public ConstEvaluatedExprVisitor<SequenceChecker> {
using Base = ConstEvaluatedExprVisitor<SequenceChecker>;
/// A tree of sequenced regions within an expression. Two regions are
/// unsequenced if one is an ancestor or a descendent of the other. When we
/// finish processing an expression with sequencing, such as a comma
/// expression, we fold its tree nodes into its parent, since they are
/// unsequenced with respect to nodes we will visit later.
class SequenceTree {
struct Value {
explicit Value(unsigned Parent) : Parent(Parent), Merged(false) {}
unsigned Parent : 31;
unsigned Merged : 1;
};
SmallVector<Value, 8> Values;
public:
/// A region within an expression which may be sequenced with respect
/// to some other region.
class Seq {
friend class SequenceTree;
unsigned Index;
explicit Seq(unsigned N) : Index(N) {}
public:
Seq() : Index(0) {}
};
SequenceTree() { Values.push_back(Value(0)); }
Seq root() const { return Seq(0); }
/// Create a new sequence of operations, which is an unsequenced
/// subset of \p Parent. This sequence of operations is sequenced with
/// respect to other children of \p Parent.
Seq allocate(Seq Parent) {
Values.push_back(Value(Parent.Index));
return Seq(Values.size() - 1);
}
/// Merge a sequence of operations into its parent.
void merge(Seq S) {
Values[S.Index].Merged = true;
}
/// Determine whether two operations are unsequenced. This operation
/// is asymmetric: \p Cur should be the more recent sequence, and \p Old
/// should have been merged into its parent as appropriate.
bool isUnsequenced(Seq Cur, Seq Old) {
unsigned C = representative(Cur.Index);
unsigned Target = representative(Old.Index);
while (C >= Target) {
if (C == Target)
return true;
C = Values[C].Parent;
}
return false;
}
private:
/// Pick a representative for a sequence.
unsigned representative(unsigned K) {
if (Values[K].Merged)
// Perform path compression as we go.
return Values[K].Parent = representative(Values[K].Parent);
return K;
}
};
/// An object for which we can track unsequenced uses.
using Object = const NamedDecl *;
/// Different flavors of object usage which we track. We only track the
/// least-sequenced usage of each kind.
enum UsageKind {
/// A read of an object. Multiple unsequenced reads are OK.
UK_Use,
/// A modification of an object which is sequenced before the value
/// computation of the expression, such as ++n in C++.
UK_ModAsValue,
/// A modification of an object which is not sequenced before the value
/// computation of the expression, such as n++.
UK_ModAsSideEffect,
UK_Count = UK_ModAsSideEffect + 1
};
/// Bundle together a sequencing region and the expression corresponding
/// to a specific usage. One Usage is stored for each usage kind in UsageInfo.
struct Usage {
const Expr *UsageExpr;
SequenceTree::Seq Seq;
Usage() : UsageExpr(nullptr), Seq() {}
};
struct UsageInfo {
Usage Uses[UK_Count];
/// Have we issued a diagnostic for this object already?
bool Diagnosed;
UsageInfo() : Uses(), Diagnosed(false) {}
};
using UsageInfoMap = llvm::SmallDenseMap<Object, UsageInfo, 16>;
Sema &SemaRef;
/// Sequenced regions within the expression.
SequenceTree Tree;
/// Declaration modifications and references which we have seen.
UsageInfoMap UsageMap;
/// The region we are currently within.
SequenceTree::Seq Region;
/// Filled in with declarations which were modified as a side-effect
/// (that is, post-increment operations).
SmallVectorImpl<std::pair<Object, Usage>> *ModAsSideEffect = nullptr;
/// Expressions to check later. We defer checking these to reduce
/// stack usage.
SmallVectorImpl<const Expr *> &WorkList;
/// RAII object wrapping the visitation of a sequenced subexpression of an
/// expression. At the end of this process, the side-effects of the evaluation
/// become sequenced with respect to the value computation of the result, so
/// we downgrade any UK_ModAsSideEffect within the evaluation to
/// UK_ModAsValue.
struct SequencedSubexpression {
SequencedSubexpression(SequenceChecker &Self)
: Self(Self), OldModAsSideEffect(Self.ModAsSideEffect) {
Self.ModAsSideEffect = &ModAsSideEffect;
}
~SequencedSubexpression() {
for (const std::pair<Object, Usage> &M : llvm::reverse(ModAsSideEffect)) {
// Add a new usage with usage kind UK_ModAsValue, and then restore
// the previous usage with UK_ModAsSideEffect (thus clearing it if
// the previous one was empty).
UsageInfo &UI = Self.UsageMap[M.first];
auto &SideEffectUsage = UI.Uses[UK_ModAsSideEffect];
Self.addUsage(M.first, UI, SideEffectUsage.UsageExpr, UK_ModAsValue);
SideEffectUsage = M.second;
}
Self.ModAsSideEffect = OldModAsSideEffect;
}
SequenceChecker &Self;
SmallVector<std::pair<Object, Usage>, 4> ModAsSideEffect;
SmallVectorImpl<std::pair<Object, Usage>> *OldModAsSideEffect;
};
/// RAII object wrapping the visitation of a subexpression which we might
/// choose to evaluate as a constant. If any subexpression is evaluated and
/// found to be non-constant, this allows us to suppress the evaluation of
/// the outer expression.
class EvaluationTracker {
public:
EvaluationTracker(SequenceChecker &Self)
: Self(Self), Prev(Self.EvalTracker) {
Self.EvalTracker = this;
}
~EvaluationTracker() {
Self.EvalTracker = Prev;
if (Prev)
Prev->EvalOK &= EvalOK;
}
bool evaluate(const Expr *E, bool &Result) {
if (!EvalOK || E->isValueDependent())
return false;
EvalOK = E->EvaluateAsBooleanCondition(
Result, Self.SemaRef.Context, Self.SemaRef.isConstantEvaluated());
return EvalOK;
}
private:
SequenceChecker &Self;
EvaluationTracker *Prev;
bool EvalOK = true;
} *EvalTracker = nullptr;
/// Find the object which is produced by the specified expression,
/// if any.
Object getObject(const Expr *E, bool Mod) const {
E = E->IgnoreParenCasts();
if (const UnaryOperator *UO = dyn_cast<UnaryOperator>(E)) {
if (Mod && (UO->getOpcode() == UO_PreInc || UO->getOpcode() == UO_PreDec))
return getObject(UO->getSubExpr(), Mod);
} else if (const BinaryOperator *BO = dyn_cast<BinaryOperator>(E)) {
if (BO->getOpcode() == BO_Comma)
return getObject(BO->getRHS(), Mod);
if (Mod && BO->isAssignmentOp())
return getObject(BO->getLHS(), Mod);
} else if (const MemberExpr *ME = dyn_cast<MemberExpr>(E)) {
// FIXME: Check for more interesting cases, like "x.n = ++x.n".
if (isa<CXXThisExpr>(ME->getBase()->IgnoreParenCasts()))
return ME->getMemberDecl();
} else if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E))
// FIXME: If this is a reference, map through to its value.
return DRE->getDecl();
return nullptr;
}
/// Note that an object \p O was modified or used by an expression
/// \p UsageExpr with usage kind \p UK. \p UI is the \p UsageInfo for
/// the object \p O as obtained via the \p UsageMap.
void addUsage(Object O, UsageInfo &UI, const Expr *UsageExpr, UsageKind UK) {
// Get the old usage for the given object and usage kind.
Usage &U = UI.Uses[UK];
if (!U.UsageExpr || !Tree.isUnsequenced(Region, U.Seq)) {
// If we have a modification as side effect and are in a sequenced
// subexpression, save the old Usage so that we can restore it later
// in SequencedSubexpression::~SequencedSubexpression.
if (UK == UK_ModAsSideEffect && ModAsSideEffect)
ModAsSideEffect->push_back(std::make_pair(O, U));
// Then record the new usage with the current sequencing region.
U.UsageExpr = UsageExpr;
U.Seq = Region;
}
}
/// Check whether a modification or use of an object \p O in an expression
/// \p UsageExpr conflicts with a prior usage of kind \p OtherKind. \p UI is
/// the \p UsageInfo for the object \p O as obtained via the \p UsageMap.
/// \p IsModMod is true when we are checking for a mod-mod unsequenced
/// usage and false we are checking for a mod-use unsequenced usage.
void checkUsage(Object O, UsageInfo &UI, const Expr *UsageExpr,
UsageKind OtherKind, bool IsModMod) {
if (UI.Diagnosed)
return;
const Usage &U = UI.Uses[OtherKind];
if (!U.UsageExpr || !Tree.isUnsequenced(Region, U.Seq))
return;
const Expr *Mod = U.UsageExpr;
const Expr *ModOrUse = UsageExpr;
if (OtherKind == UK_Use)
std::swap(Mod, ModOrUse);
SemaRef.DiagRuntimeBehavior(
Mod->getExprLoc(), {Mod, ModOrUse},
SemaRef.PDiag(IsModMod ? diag::warn_unsequenced_mod_mod
: diag::warn_unsequenced_mod_use)
<< O << SourceRange(ModOrUse->getExprLoc()));
UI.Diagnosed = true;
}
// A note on note{Pre, Post}{Use, Mod}:
//
// (It helps to follow the algorithm with an expression such as
// "((++k)++, k) = k" or "k = (k++, k++)". Both contain unsequenced
// operations before C++17 and both are well-defined in C++17).
//
// When visiting a node which uses/modify an object we first call notePreUse
// or notePreMod before visiting its sub-expression(s). At this point the
// children of the current node have not yet been visited and so the eventual
// uses/modifications resulting from the children of the current node have not
// been recorded yet.
//
// We then visit the children of the current node. After that notePostUse or
// notePostMod is called. These will 1) detect an unsequenced modification
// as side effect (as in "k++ + k") and 2) add a new usage with the
// appropriate usage kind.
//
// We also have to be careful that some operation sequences modification as
// side effect as well (for example: || or ,). To account for this we wrap
// the visitation of such a sub-expression (for example: the LHS of || or ,)
// with SequencedSubexpression. SequencedSubexpression is an RAII object
// which record usages which are modifications as side effect, and then
// downgrade them (or more accurately restore the previous usage which was a
// modification as side effect) when exiting the scope of the sequenced
// subexpression.
void notePreUse(Object O, const Expr *UseExpr) {
UsageInfo &UI = UsageMap[O];
// Uses conflict with other modifications.
checkUsage(O, UI, UseExpr, /*OtherKind=*/UK_ModAsValue, /*IsModMod=*/false);
}
void notePostUse(Object O, const Expr *UseExpr) {
UsageInfo &UI = UsageMap[O];
checkUsage(O, UI, UseExpr, /*OtherKind=*/UK_ModAsSideEffect,
/*IsModMod=*/false);
addUsage(O, UI, UseExpr, /*UsageKind=*/UK_Use);
}
void notePreMod(Object O, const Expr *ModExpr) {
UsageInfo &UI = UsageMap[O];
// Modifications conflict with other modifications and with uses.
checkUsage(O, UI, ModExpr, /*OtherKind=*/UK_ModAsValue, /*IsModMod=*/true);
checkUsage(O, UI, ModExpr, /*OtherKind=*/UK_Use, /*IsModMod=*/false);
}
void notePostMod(Object O, const Expr *ModExpr, UsageKind UK) {
UsageInfo &UI = UsageMap[O];
checkUsage(O, UI, ModExpr, /*OtherKind=*/UK_ModAsSideEffect,
/*IsModMod=*/true);
addUsage(O, UI, ModExpr, /*UsageKind=*/UK);
}
public:
SequenceChecker(Sema &S, const Expr *E,
SmallVectorImpl<const Expr *> &WorkList)
: Base(S.Context), SemaRef(S), Region(Tree.root()), WorkList(WorkList) {
Visit(E);
// Silence a -Wunused-private-field since WorkList is now unused.
// TODO: Evaluate if it can be used, and if not remove it.
(void)this->WorkList;
}
void VisitStmt(const Stmt *S) {
// Skip all statements which aren't expressions for now.
}
void VisitExpr(const Expr *E) {
// By default, just recurse to evaluated subexpressions.
Base::VisitStmt(E);
}
void VisitCastExpr(const CastExpr *E) {
Object O = Object();
if (E->getCastKind() == CK_LValueToRValue)
O = getObject(E->getSubExpr(), false);
if (O)
notePreUse(O, E);
VisitExpr(E);
if (O)
notePostUse(O, E);
}
void VisitSequencedExpressions(const Expr *SequencedBefore,
const Expr *SequencedAfter) {
SequenceTree::Seq BeforeRegion = Tree.allocate(Region);
SequenceTree::Seq AfterRegion = Tree.allocate(Region);
SequenceTree::Seq OldRegion = Region;
{
SequencedSubexpression SeqBefore(*this);
Region = BeforeRegion;
Visit(SequencedBefore);
}
Region = AfterRegion;
Visit(SequencedAfter);
Region = OldRegion;
Tree.merge(BeforeRegion);
Tree.merge(AfterRegion);
}
void VisitArraySubscriptExpr(const ArraySubscriptExpr *ASE) {
// C++17 [expr.sub]p1:
// The expression E1[E2] is identical (by definition) to *((E1)+(E2)). The
// expression E1 is sequenced before the expression E2.
if (SemaRef.getLangOpts().CPlusPlus17)
VisitSequencedExpressions(ASE->getLHS(), ASE->getRHS());
else {
Visit(ASE->getLHS());
Visit(ASE->getRHS());
}
}
void VisitBinPtrMemD(const BinaryOperator *BO) { VisitBinPtrMem(BO); }
void VisitBinPtrMemI(const BinaryOperator *BO) { VisitBinPtrMem(BO); }
void VisitBinPtrMem(const BinaryOperator *BO) {
// C++17 [expr.mptr.oper]p4:
// Abbreviating pm-expression.*cast-expression as E1.*E2, [...]
// the expression E1 is sequenced before the expression E2.
if (SemaRef.getLangOpts().CPlusPlus17)
VisitSequencedExpressions(BO->getLHS(), BO->getRHS());
else {
Visit(BO->getLHS());
Visit(BO->getRHS());
}
}
void VisitBinShl(const BinaryOperator *BO) { VisitBinShlShr(BO); }
void VisitBinShr(const BinaryOperator *BO) { VisitBinShlShr(BO); }
void VisitBinShlShr(const BinaryOperator *BO) {
// C++17 [expr.shift]p4:
// The expression E1 is sequenced before the expression E2.
if (SemaRef.getLangOpts().CPlusPlus17)
VisitSequencedExpressions(BO->getLHS(), BO->getRHS());
else {
Visit(BO->getLHS());
Visit(BO->getRHS());
}
}
void VisitBinComma(const BinaryOperator *BO) {
// C++11 [expr.comma]p1:
// Every value computation and side effect associated with the left
// expression is sequenced before every value computation and side
// effect associated with the right expression.
VisitSequencedExpressions(BO->getLHS(), BO->getRHS());
}
void VisitBinAssign(const BinaryOperator *BO) {
SequenceTree::Seq RHSRegion;
SequenceTree::Seq LHSRegion;
if (SemaRef.getLangOpts().CPlusPlus17) {
RHSRegion = Tree.allocate(Region);
LHSRegion = Tree.allocate(Region);
} else {
RHSRegion = Region;
LHSRegion = Region;
}
SequenceTree::Seq OldRegion = Region;
// C++11 [expr.ass]p1:
// [...] the assignment is sequenced after the value computation
// of the right and left operands, [...]
//
// so check it before inspecting the operands and update the
// map afterwards.
Object O = getObject(BO->getLHS(), /*Mod=*/true);
if (O)
notePreMod(O, BO);
if (SemaRef.getLangOpts().CPlusPlus17) {
// C++17 [expr.ass]p1:
// [...] The right operand is sequenced before the left operand. [...]
{
SequencedSubexpression SeqBefore(*this);
Region = RHSRegion;
Visit(BO->getRHS());
}
Region = LHSRegion;
Visit(BO->getLHS());
if (O && isa<CompoundAssignOperator>(BO))
notePostUse(O, BO);
} else {
// C++11 does not specify any sequencing between the LHS and RHS.
Region = LHSRegion;
Visit(BO->getLHS());
if (O && isa<CompoundAssignOperator>(BO))
notePostUse(O, BO);
Region = RHSRegion;
Visit(BO->getRHS());
}
// C++11 [expr.ass]p1:
// the assignment is sequenced [...] before the value computation of the
// assignment expression.
// C11 6.5.16/3 has no such rule.
Region = OldRegion;
if (O)
notePostMod(O, BO,
SemaRef.getLangOpts().CPlusPlus ? UK_ModAsValue
: UK_ModAsSideEffect);
if (SemaRef.getLangOpts().CPlusPlus17) {
Tree.merge(RHSRegion);
Tree.merge(LHSRegion);
}
}
void VisitCompoundAssignOperator(const CompoundAssignOperator *CAO) {
VisitBinAssign(CAO);
}
void VisitUnaryPreInc(const UnaryOperator *UO) { VisitUnaryPreIncDec(UO); }
void VisitUnaryPreDec(const UnaryOperator *UO) { VisitUnaryPreIncDec(UO); }
void VisitUnaryPreIncDec(const UnaryOperator *UO) {
Object O = getObject(UO->getSubExpr(), true);
if (!O)
return VisitExpr(UO);
notePreMod(O, UO);
Visit(UO->getSubExpr());
// C++11 [expr.pre.incr]p1:
// the expression ++x is equivalent to x+=1
notePostMod(O, UO,
SemaRef.getLangOpts().CPlusPlus ? UK_ModAsValue
: UK_ModAsSideEffect);
}
void VisitUnaryPostInc(const UnaryOperator *UO) { VisitUnaryPostIncDec(UO); }
void VisitUnaryPostDec(const UnaryOperator *UO) { VisitUnaryPostIncDec(UO); }
void VisitUnaryPostIncDec(const UnaryOperator *UO) {
Object O = getObject(UO->getSubExpr(), true);
if (!O)
return VisitExpr(UO);
notePreMod(O, UO);
Visit(UO->getSubExpr());
notePostMod(O, UO, UK_ModAsSideEffect);
}
void VisitBinLOr(const BinaryOperator *BO) {
// C++11 [expr.log.or]p2:
// If the second expression is evaluated, every value computation and
// side effect associated with the first expression is sequenced before
// every value computation and side effect associated with the
// second expression.
SequenceTree::Seq LHSRegion = Tree.allocate(Region);
SequenceTree::Seq RHSRegion = Tree.allocate(Region);
SequenceTree::Seq OldRegion = Region;
EvaluationTracker Eval(*this);
{
SequencedSubexpression Sequenced(*this);
Region = LHSRegion;
Visit(BO->getLHS());
}
// C++11 [expr.log.or]p1:
// [...] the second operand is not evaluated if the first operand
// evaluates to true.
bool EvalResult = false;
bool EvalOK = Eval.evaluate(BO->getLHS(), EvalResult);
bool ShouldVisitRHS = !EvalOK || (EvalOK && !EvalResult);
if (ShouldVisitRHS) {
Region = RHSRegion;
Visit(BO->getRHS());
}
Region = OldRegion;
Tree.merge(LHSRegion);
Tree.merge(RHSRegion);
}
void VisitBinLAnd(const BinaryOperator *BO) {
// C++11 [expr.log.and]p2:
// If the second expression is evaluated, every value computation and
// side effect associated with the first expression is sequenced before
// every value computation and side effect associated with the
// second expression.
SequenceTree::Seq LHSRegion = Tree.allocate(Region);
SequenceTree::Seq RHSRegion = Tree.allocate(Region);
SequenceTree::Seq OldRegion = Region;
EvaluationTracker Eval(*this);
{
SequencedSubexpression Sequenced(*this);
Region = LHSRegion;
Visit(BO->getLHS());
}
// C++11 [expr.log.and]p1:
// [...] the second operand is not evaluated if the first operand is false.
bool EvalResult = false;
bool EvalOK = Eval.evaluate(BO->getLHS(), EvalResult);
bool ShouldVisitRHS = !EvalOK || (EvalOK && EvalResult);
if (ShouldVisitRHS) {
Region = RHSRegion;
Visit(BO->getRHS());
}
Region = OldRegion;
Tree.merge(LHSRegion);
Tree.merge(RHSRegion);
}
void VisitAbstractConditionalOperator(const AbstractConditionalOperator *CO) {
// C++11 [expr.cond]p1:
// [...] Every value computation and side effect associated with the first
// expression is sequenced before every value computation and side effect
// associated with the second or third expression.
SequenceTree::Seq ConditionRegion = Tree.allocate(Region);
// No sequencing is specified between the true and false expression.
// However since exactly one of both is going to be evaluated we can
// consider them to be sequenced. This is needed to avoid warning on
// something like "x ? y+= 1 : y += 2;" in the case where we will visit
// both the true and false expressions because we can't evaluate x.
// This will still allow us to detect an expression like (pre C++17)
// "(x ? y += 1 : y += 2) = y".
//
// We don't wrap the visitation of the true and false expression with
// SequencedSubexpression because we don't want to downgrade modifications
// as side effect in the true and false expressions after the visition
// is done. (for example in the expression "(x ? y++ : y++) + y" we should
// not warn between the two "y++", but we should warn between the "y++"
// and the "y".
SequenceTree::Seq TrueRegion = Tree.allocate(Region);
SequenceTree::Seq FalseRegion = Tree.allocate(Region);
SequenceTree::Seq OldRegion = Region;
EvaluationTracker Eval(*this);
{
SequencedSubexpression Sequenced(*this);
Region = ConditionRegion;
Visit(CO->getCond());
}
// C++11 [expr.cond]p1:
// [...] The first expression is contextually converted to bool (Clause 4).
// It is evaluated and if it is true, the result of the conditional
// expression is the value of the second expression, otherwise that of the
// third expression. Only one of the second and third expressions is
// evaluated. [...]
bool EvalResult = false;
bool EvalOK = Eval.evaluate(CO->getCond(), EvalResult);
bool ShouldVisitTrueExpr = !EvalOK || (EvalOK && EvalResult);
bool ShouldVisitFalseExpr = !EvalOK || (EvalOK && !EvalResult);
if (ShouldVisitTrueExpr) {
Region = TrueRegion;
Visit(CO->getTrueExpr());
}
if (ShouldVisitFalseExpr) {
Region = FalseRegion;
Visit(CO->getFalseExpr());
}
Region = OldRegion;
Tree.merge(ConditionRegion);
Tree.merge(TrueRegion);
Tree.merge(FalseRegion);
}
void VisitCallExpr(const CallExpr *CE) {
// FIXME: CXXNewExpr and CXXDeleteExpr implicitly call functions.
if (CE->isUnevaluatedBuiltinCall(Context))
return;
// C++11 [intro.execution]p15:
// When calling a function [...], every value computation and side effect
// associated with any argument expression, or with the postfix expression
// designating the called function, is sequenced before execution of every
// expression or statement in the body of the function [and thus before
// the value computation of its result].
SequencedSubexpression Sequenced(*this);
SemaRef.runWithSufficientStackSpace(CE->getExprLoc(), [&] {
// C++17 [expr.call]p5
// The postfix-expression is sequenced before each expression in the
// expression-list and any default argument. [...]
SequenceTree::Seq CalleeRegion;
SequenceTree::Seq OtherRegion;
if (SemaRef.getLangOpts().CPlusPlus17) {
CalleeRegion = Tree.allocate(Region);
OtherRegion = Tree.allocate(Region);
} else {
CalleeRegion = Region;
OtherRegion = Region;
}
SequenceTree::Seq OldRegion = Region;
// Visit the callee expression first.
Region = CalleeRegion;
if (SemaRef.getLangOpts().CPlusPlus17) {
SequencedSubexpression Sequenced(*this);
Visit(CE->getCallee());
} else {
Visit(CE->getCallee());
}
// Then visit the argument expressions.
Region = OtherRegion;
for (const Expr *Argument : CE->arguments())
Visit(Argument);
Region = OldRegion;
if (SemaRef.getLangOpts().CPlusPlus17) {
Tree.merge(CalleeRegion);
Tree.merge(OtherRegion);
}
});
}
void VisitCXXOperatorCallExpr(const CXXOperatorCallExpr *CXXOCE) {
// C++17 [over.match.oper]p2:
// [...] the operator notation is first transformed to the equivalent
// function-call notation as summarized in Table 12 (where @ denotes one
// of the operators covered in the specified subclause). However, the
// operands are sequenced in the order prescribed for the built-in
// operator (Clause 8).
//
// From the above only overloaded binary operators and overloaded call
// operators have sequencing rules in C++17 that we need to handle
// separately.
if (!SemaRef.getLangOpts().CPlusPlus17 ||
(CXXOCE->getNumArgs() != 2 && CXXOCE->getOperator() != OO_Call))
return VisitCallExpr(CXXOCE);
enum {
NoSequencing,
LHSBeforeRHS,
RHSBeforeLHS,
LHSBeforeRest
} SequencingKind;
switch (CXXOCE->getOperator()) {
case OO_Equal:
case OO_PlusEqual:
case OO_MinusEqual:
case OO_StarEqual:
case OO_SlashEqual:
case OO_PercentEqual:
case OO_CaretEqual:
case OO_AmpEqual:
case OO_PipeEqual:
case OO_LessLessEqual:
case OO_GreaterGreaterEqual:
SequencingKind = RHSBeforeLHS;
break;
case OO_LessLess:
case OO_GreaterGreater:
case OO_AmpAmp:
case OO_PipePipe:
case OO_Comma:
case OO_ArrowStar:
case OO_Subscript:
SequencingKind = LHSBeforeRHS;
break;
case OO_Call:
SequencingKind = LHSBeforeRest;
break;
default:
SequencingKind = NoSequencing;
break;
}
if (SequencingKind == NoSequencing)
return VisitCallExpr(CXXOCE);
// This is a call, so all subexpressions are sequenced before the result.
SequencedSubexpression Sequenced(*this);
SemaRef.runWithSufficientStackSpace(CXXOCE->getExprLoc(), [&] {
assert(SemaRef.getLangOpts().CPlusPlus17 &&
"Should only get there with C++17 and above!");
assert((CXXOCE->getNumArgs() == 2 || CXXOCE->getOperator() == OO_Call) &&
"Should only get there with an overloaded binary operator"
" or an overloaded call operator!");
if (SequencingKind == LHSBeforeRest) {
assert(CXXOCE->getOperator() == OO_Call &&
"We should only have an overloaded call operator here!");
// This is very similar to VisitCallExpr, except that we only have the
// C++17 case. The postfix-expression is the first argument of the
// CXXOperatorCallExpr. The expressions in the expression-list, if any,
// are in the following arguments.
//
// Note that we intentionally do not visit the callee expression since
// it is just a decayed reference to a function.
SequenceTree::Seq PostfixExprRegion = Tree.allocate(Region);
SequenceTree::Seq ArgsRegion = Tree.allocate(Region);
SequenceTree::Seq OldRegion = Region;
assert(CXXOCE->getNumArgs() >= 1 &&
"An overloaded call operator must have at least one argument"
" for the postfix-expression!");
const Expr *PostfixExpr = CXXOCE->getArgs()[0];
llvm::ArrayRef<const Expr *> Args(CXXOCE->getArgs() + 1,
CXXOCE->getNumArgs() - 1);
// Visit the postfix-expression first.
{
Region = PostfixExprRegion;
SequencedSubexpression Sequenced(*this);
Visit(PostfixExpr);
}
// Then visit the argument expressions.
Region = ArgsRegion;
for (const Expr *Arg : Args)
Visit(Arg);
Region = OldRegion;
Tree.merge(PostfixExprRegion);
Tree.merge(ArgsRegion);
} else {
assert(CXXOCE->getNumArgs() == 2 &&
"Should only have two arguments here!");
assert((SequencingKind == LHSBeforeRHS ||
SequencingKind == RHSBeforeLHS) &&
"Unexpected sequencing kind!");
// We do not visit the callee expression since it is just a decayed
// reference to a function.
const Expr *E1 = CXXOCE->getArg(0);
const Expr *E2 = CXXOCE->getArg(1);
if (SequencingKind == RHSBeforeLHS)
std::swap(E1, E2);
return VisitSequencedExpressions(E1, E2);
}
});
}
void VisitCXXConstructExpr(const CXXConstructExpr *CCE) {
// This is a call, so all subexpressions are sequenced before the result.
SequencedSubexpression Sequenced(*this);
if (!CCE->isListInitialization())
return VisitExpr(CCE);
// In C++11, list initializations are sequenced.
SmallVector<SequenceTree::Seq, 32> Elts;
SequenceTree::Seq Parent = Region;
for (CXXConstructExpr::const_arg_iterator I = CCE->arg_begin(),
E = CCE->arg_end();
I != E; ++I) {
Region = Tree.allocate(Parent);
Elts.push_back(Region);
Visit(*I);
}
// Forget that the initializers are sequenced.
Region = Parent;
for (unsigned I = 0; I < Elts.size(); ++I)
Tree.merge(Elts[I]);
}
void VisitInitListExpr(const InitListExpr *ILE) {
if (!SemaRef.getLangOpts().CPlusPlus11)
return VisitExpr(ILE);
// In C++11, list initializations are sequenced.
SmallVector<SequenceTree::Seq, 32> Elts;
SequenceTree::Seq Parent = Region;
for (unsigned I = 0; I < ILE->getNumInits(); ++I) {
const Expr *E = ILE->getInit(I);
if (!E)
continue;
Region = Tree.allocate(Parent);
Elts.push_back(Region);
Visit(E);
}
// Forget that the initializers are sequenced.
Region = Parent;
for (unsigned I = 0; I < Elts.size(); ++I)
Tree.merge(Elts[I]);
}
};
} // namespace
void Sema::CheckUnsequencedOperations(const Expr *E) {
SmallVector<const Expr *, 8> WorkList;
WorkList.push_back(E);
while (!WorkList.empty()) {
const Expr *Item = WorkList.pop_back_val();
SequenceChecker(*this, Item, WorkList);
}
}
void Sema::CheckCompletedExpr(Expr *E, SourceLocation CheckLoc,
bool IsConstexpr) {
llvm::SaveAndRestore<bool> ConstantContext(
isConstantEvaluatedOverride, IsConstexpr || isa<ConstantExpr>(E));
CheckImplicitConversions(E, CheckLoc);
if (!E->isInstantiationDependent())
CheckUnsequencedOperations(E);
if (!IsConstexpr && !E->isValueDependent())
CheckForIntOverflow(E);
DiagnoseMisalignedMembers();
}
void Sema::CheckBitFieldInitialization(SourceLocation InitLoc,
FieldDecl *BitField,
Expr *Init) {
(void) AnalyzeBitFieldAssignment(*this, BitField, Init, InitLoc);
}
static void diagnoseArrayStarInParamType(Sema &S, QualType PType,
SourceLocation Loc) {
if (!PType->isVariablyModifiedType())
return;
if (const auto *PointerTy = dyn_cast<PointerType>(PType)) {
diagnoseArrayStarInParamType(S, PointerTy->getPointeeType(), Loc);
return;
}
if (const auto *ReferenceTy = dyn_cast<ReferenceType>(PType)) {
diagnoseArrayStarInParamType(S, ReferenceTy->getPointeeType(), Loc);
return;
}
if (const auto *ParenTy = dyn_cast<ParenType>(PType)) {
diagnoseArrayStarInParamType(S, ParenTy->getInnerType(), Loc);
return;
}
const ArrayType *AT = S.Context.getAsArrayType(PType);
if (!AT)
return;
if (AT->getSizeModifier() != ArrayType::Star) {
diagnoseArrayStarInParamType(S, AT->getElementType(), Loc);
return;
}
S.Diag(Loc, diag::err_array_star_in_function_definition);
}
/// CheckParmsForFunctionDef - Check that the parameters of the given
/// function are appropriate for the definition of a function. This
/// takes care of any checks that cannot be performed on the
/// declaration itself, e.g., that the types of each of the function
/// parameters are complete.
bool Sema::CheckParmsForFunctionDef(ArrayRef<ParmVarDecl *> Parameters,
bool CheckParameterNames) {
bool HasInvalidParm = false;
for (ParmVarDecl *Param : Parameters) {
// C99 6.7.5.3p4: the parameters in a parameter type list in a
// function declarator that is part of a function definition of
// that function shall not have incomplete type.
//
// This is also C++ [dcl.fct]p6.
if (!Param->isInvalidDecl() &&
RequireCompleteType(Param->getLocation(), Param->getType(),
diag::err_typecheck_decl_incomplete_type)) {
Param->setInvalidDecl();
HasInvalidParm = true;
}
// C99 6.9.1p5: If the declarator includes a parameter type list, the
// declaration of each parameter shall include an identifier.
if (CheckParameterNames && Param->getIdentifier() == nullptr &&
!Param->isImplicit() && !getLangOpts().CPlusPlus) {
// Diagnose this as an extension in C17 and earlier.
if (!getLangOpts().C2x)
Diag(Param->getLocation(), diag::ext_parameter_name_omitted_c2x);
}
// C99 6.7.5.3p12:
// If the function declarator is not part of a definition of that
// function, parameters may have incomplete type and may use the [*]
// notation in their sequences of declarator specifiers to specify
// variable length array types.
QualType PType = Param->getOriginalType();
// FIXME: This diagnostic should point the '[*]' if source-location
// information is added for it.
diagnoseArrayStarInParamType(*this, PType, Param->getLocation());
// If the parameter is a c++ class type and it has to be destructed in the
// callee function, declare the destructor so that it can be called by the
// callee function. Do not perform any direct access check on the dtor here.
if (!Param->isInvalidDecl()) {
if (CXXRecordDecl *ClassDecl = Param->getType()->getAsCXXRecordDecl()) {
if (!ClassDecl->isInvalidDecl() &&
!ClassDecl->hasIrrelevantDestructor() &&
!ClassDecl->isDependentContext() &&
ClassDecl->isParamDestroyedInCallee()) {
CXXDestructorDecl *Destructor = LookupDestructor(ClassDecl);
MarkFunctionReferenced(Param->getLocation(), Destructor);
DiagnoseUseOfDecl(Destructor, Param->getLocation());
}
}
}
// Parameters with the pass_object_size attribute only need to be marked
// constant at function definitions. Because we lack information about
// whether we're on a declaration or definition when we're instantiating the
// attribute, we need to check for constness here.
if (const auto *Attr = Param->getAttr<PassObjectSizeAttr>())
if (!Param->getType().isConstQualified())
Diag(Param->getLocation(), diag::err_attribute_pointers_only)
<< Attr->getSpelling() << 1;
// Check for parameter names shadowing fields from the class.
if (LangOpts.CPlusPlus && !Param->isInvalidDecl()) {
// The owning context for the parameter should be the function, but we
// want to see if this function's declaration context is a record.
DeclContext *DC = Param->getDeclContext();
if (DC && DC->isFunctionOrMethod()) {
if (auto *RD = dyn_cast<CXXRecordDecl>(DC->getParent()))
CheckShadowInheritedFields(Param->getLocation(), Param->getDeclName(),
RD, /*DeclIsField*/ false);
}
}
}
return HasInvalidParm;
}
Optional<std::pair<CharUnits, CharUnits>>
static getBaseAlignmentAndOffsetFromPtr(const Expr *E, ASTContext &Ctx);
/// Compute the alignment and offset of the base class object given the
/// derived-to-base cast expression and the alignment and offset of the derived
/// class object.
static std::pair<CharUnits, CharUnits>
getDerivedToBaseAlignmentAndOffset(const CastExpr *CE, QualType DerivedType,
CharUnits BaseAlignment, CharUnits Offset,
ASTContext &Ctx) {
for (auto PathI = CE->path_begin(), PathE = CE->path_end(); PathI != PathE;
++PathI) {
const CXXBaseSpecifier *Base = *PathI;
const CXXRecordDecl *BaseDecl = Base->getType()->getAsCXXRecordDecl();
if (Base->isVirtual()) {
// The complete object may have a lower alignment than the non-virtual
// alignment of the base, in which case the base may be misaligned. Choose
// the smaller of the non-virtual alignment and BaseAlignment, which is a
// conservative lower bound of the complete object alignment.
CharUnits NonVirtualAlignment =
Ctx.getASTRecordLayout(BaseDecl).getNonVirtualAlignment();
BaseAlignment = std::min(BaseAlignment, NonVirtualAlignment);
Offset = CharUnits::Zero();
} else {
const ASTRecordLayout &RL =
Ctx.getASTRecordLayout(DerivedType->getAsCXXRecordDecl());
Offset += RL.getBaseClassOffset(BaseDecl);
}
DerivedType = Base->getType();
}
return std::make_pair(BaseAlignment, Offset);
}
/// Compute the alignment and offset of a binary additive operator.
static Optional<std::pair<CharUnits, CharUnits>>
getAlignmentAndOffsetFromBinAddOrSub(const Expr *PtrE, const Expr *IntE,
bool IsSub, ASTContext &Ctx) {
QualType PointeeType = PtrE->getType()->getPointeeType();
if (!PointeeType->isConstantSizeType())
return llvm::None;
auto P = getBaseAlignmentAndOffsetFromPtr(PtrE, Ctx);
if (!P)
return llvm::None;
CharUnits EltSize = Ctx.getTypeSizeInChars(PointeeType);
if (Optional<llvm::APSInt> IdxRes = IntE->getIntegerConstantExpr(Ctx)) {
CharUnits Offset = EltSize * IdxRes->getExtValue();
if (IsSub)
Offset = -Offset;
return std::make_pair(P->first, P->second + Offset);
}
// If the integer expression isn't a constant expression, compute the lower
// bound of the alignment using the alignment and offset of the pointer
// expression and the element size.
return std::make_pair(
P->first.alignmentAtOffset(P->second).alignmentAtOffset(EltSize),
CharUnits::Zero());
}
/// This helper function takes an lvalue expression and returns the alignment of
/// a VarDecl and a constant offset from the VarDecl.
Optional<std::pair<CharUnits, CharUnits>>
static getBaseAlignmentAndOffsetFromLValue(const Expr *E, ASTContext &Ctx) {
E = E->IgnoreParens();
switch (E->getStmtClass()) {
default:
break;
case Stmt::CStyleCastExprClass:
case Stmt::CXXStaticCastExprClass:
case Stmt::ImplicitCastExprClass: {
auto *CE = cast<CastExpr>(E);
const Expr *From = CE->getSubExpr();
switch (CE->getCastKind()) {
default:
break;
case CK_NoOp:
return getBaseAlignmentAndOffsetFromLValue(From, Ctx);
case CK_UncheckedDerivedToBase:
case CK_DerivedToBase: {
auto P = getBaseAlignmentAndOffsetFromLValue(From, Ctx);
if (!P)
break;
return getDerivedToBaseAlignmentAndOffset(CE, From->getType(), P->first,
P->second, Ctx);
}
}
break;
}
case Stmt::ArraySubscriptExprClass: {
auto *ASE = cast<ArraySubscriptExpr>(E);
return getAlignmentAndOffsetFromBinAddOrSub(ASE->getBase(), ASE->getIdx(),
false, Ctx);
}
case Stmt::DeclRefExprClass: {
if (auto *VD = dyn_cast<VarDecl>(cast<DeclRefExpr>(E)->getDecl())) {
// FIXME: If VD is captured by copy or is an escaping __block variable,
// use the alignment of VD's type.
if (!VD->getType()->isReferenceType())
return std::make_pair(Ctx.getDeclAlign(VD), CharUnits::Zero());
if (VD->hasInit())
return getBaseAlignmentAndOffsetFromLValue(VD->getInit(), Ctx);
}
break;
}
case Stmt::MemberExprClass: {
auto *ME = cast<MemberExpr>(E);
auto *FD = dyn_cast<FieldDecl>(ME->getMemberDecl());
if (!FD || FD->getType()->isReferenceType())
break;
Optional<std::pair<CharUnits, CharUnits>> P;
if (ME->isArrow())
P = getBaseAlignmentAndOffsetFromPtr(ME->getBase(), Ctx);
else
P = getBaseAlignmentAndOffsetFromLValue(ME->getBase(), Ctx);
if (!P)
break;
const ASTRecordLayout &Layout = Ctx.getASTRecordLayout(FD->getParent());
uint64_t Offset = Layout.getFieldOffset(FD->getFieldIndex());
return std::make_pair(P->first,
P->second + CharUnits::fromQuantity(Offset));
}
case Stmt::UnaryOperatorClass: {
auto *UO = cast<UnaryOperator>(E);
switch (UO->getOpcode()) {
default:
break;
case UO_Deref:
return getBaseAlignmentAndOffsetFromPtr(UO->getSubExpr(), Ctx);
}
break;
}
case Stmt::BinaryOperatorClass: {
auto *BO = cast<BinaryOperator>(E);
auto Opcode = BO->getOpcode();
switch (Opcode) {
default:
break;
case BO_Comma:
return getBaseAlignmentAndOffsetFromLValue(BO->getRHS(), Ctx);
}
break;
}
}
return llvm::None;
}
/// This helper function takes a pointer expression and returns the alignment of
/// a VarDecl and a constant offset from the VarDecl.
Optional<std::pair<CharUnits, CharUnits>>
static getBaseAlignmentAndOffsetFromPtr(const Expr *E, ASTContext &Ctx) {
E = E->IgnoreParens();
switch (E->getStmtClass()) {
default:
break;
case Stmt::CStyleCastExprClass:
case Stmt::CXXStaticCastExprClass:
case Stmt::ImplicitCastExprClass: {
auto *CE = cast<CastExpr>(E);
const Expr *From = CE->getSubExpr();
switch (CE->getCastKind()) {
default:
break;
case CK_NoOp:
return getBaseAlignmentAndOffsetFromPtr(From, Ctx);
case CK_ArrayToPointerDecay:
return getBaseAlignmentAndOffsetFromLValue(From, Ctx);
case CK_UncheckedDerivedToBase:
case CK_DerivedToBase: {
auto P = getBaseAlignmentAndOffsetFromPtr(From, Ctx);
if (!P)
break;
return getDerivedToBaseAlignmentAndOffset(
CE, From->getType()->getPointeeType(), P->first, P->second, Ctx);
}
}
break;
}
case Stmt::CXXThisExprClass: {
auto *RD = E->getType()->getPointeeType()->getAsCXXRecordDecl();
CharUnits Alignment = Ctx.getASTRecordLayout(RD).getNonVirtualAlignment();
return std::make_pair(Alignment, CharUnits::Zero());
}
case Stmt::UnaryOperatorClass: {
auto *UO = cast<UnaryOperator>(E);
if (UO->getOpcode() == UO_AddrOf)
return getBaseAlignmentAndOffsetFromLValue(UO->getSubExpr(), Ctx);
break;
}
case Stmt::BinaryOperatorClass: {
auto *BO = cast<BinaryOperator>(E);
auto Opcode = BO->getOpcode();
switch (Opcode) {
default:
break;
case BO_Add:
case BO_Sub: {
const Expr *LHS = BO->getLHS(), *RHS = BO->getRHS();
if (Opcode == BO_Add && !RHS->getType()->isIntegralOrEnumerationType())
std::swap(LHS, RHS);
return getAlignmentAndOffsetFromBinAddOrSub(LHS, RHS, Opcode == BO_Sub,
Ctx);
}
case BO_Comma:
return getBaseAlignmentAndOffsetFromPtr(BO->getRHS(), Ctx);
}
break;
}
}
return llvm::None;
}
static CharUnits getPresumedAlignmentOfPointer(const Expr *E, Sema &S) {
// See if we can compute the alignment of a VarDecl and an offset from it.
Optional<std::pair<CharUnits, CharUnits>> P =
getBaseAlignmentAndOffsetFromPtr(E, S.Context);
if (P)
return P->first.alignmentAtOffset(P->second);
// If that failed, return the type's alignment.
return S.Context.getTypeAlignInChars(E->getType()->getPointeeType());
}
/// CheckCastAlign - Implements -Wcast-align, which warns when a
/// pointer cast increases the alignment requirements.
void Sema::CheckCastAlign(Expr *Op, QualType T, SourceRange TRange) {
// This is actually a lot of work to potentially be doing on every
// cast; don't do it if we're ignoring -Wcast_align (as is the default).
if (getDiagnostics().isIgnored(diag::warn_cast_align, TRange.getBegin()))
return;
// Ignore dependent types.
if (T->isDependentType() || Op->getType()->isDependentType())
return;
// Require that the destination be a pointer type.
const PointerType *DestPtr = T->getAs<PointerType>();
if (!DestPtr) return;
// If the destination has alignment 1, we're done.
QualType DestPointee = DestPtr->getPointeeType();
if (DestPointee->isIncompleteType()) return;
CharUnits DestAlign = Context.getTypeAlignInChars(DestPointee);
if (DestAlign.isOne()) return;
// Require that the source be a pointer type.
const PointerType *SrcPtr = Op->getType()->getAs<PointerType>();
if (!SrcPtr) return;
QualType SrcPointee = SrcPtr->getPointeeType();
// Explicitly allow casts from cv void*. We already implicitly
// allowed casts to cv void*, since they have alignment 1.
// Also allow casts involving incomplete types, which implicitly
// includes 'void'.
if (SrcPointee->isIncompleteType()) return;
CharUnits SrcAlign = getPresumedAlignmentOfPointer(Op, *this);
if (SrcAlign >= DestAlign) return;
Diag(TRange.getBegin(), diag::warn_cast_align)
<< Op->getType() << T
<< static_cast<unsigned>(SrcAlign.getQuantity())
<< static_cast<unsigned>(DestAlign.getQuantity())
<< TRange << Op->getSourceRange();
}
/// Check whether this array fits the idiom of a size-one tail padded
/// array member of a struct.
///
/// We avoid emitting out-of-bounds access warnings for such arrays as they are
/// commonly used to emulate flexible arrays in C89 code.
static bool IsTailPaddedMemberArray(Sema &S, const llvm::APInt &Size,
const NamedDecl *ND) {
if (Size != 1 || !ND) return false;
const FieldDecl *FD = dyn_cast<FieldDecl>(ND);
if (!FD) return false;
// Don't consider sizes resulting from macro expansions or template argument
// substitution to form C89 tail-padded arrays.
TypeSourceInfo *TInfo = FD->getTypeSourceInfo();
while (TInfo) {
TypeLoc TL = TInfo->getTypeLoc();
// Look through typedefs.
if (TypedefTypeLoc TTL = TL.getAs<TypedefTypeLoc>()) {
const TypedefNameDecl *TDL = TTL.getTypedefNameDecl();
TInfo = TDL->getTypeSourceInfo();
continue;
}
if (ConstantArrayTypeLoc CTL = TL.getAs<ConstantArrayTypeLoc>()) {
const Expr *SizeExpr = dyn_cast<IntegerLiteral>(CTL.getSizeExpr());
if (!SizeExpr || SizeExpr->getExprLoc().isMacroID())
return false;
}
break;
}
const RecordDecl *RD = dyn_cast<RecordDecl>(FD->getDeclContext());
if (!RD) return false;
if (RD->isUnion()) return false;
if (const CXXRecordDecl *CRD = dyn_cast<CXXRecordDecl>(RD)) {
if (!CRD->isStandardLayout()) return false;
}
// See if this is the last field decl in the record.
const Decl *D = FD;
while ((D = D->getNextDeclInContext()))
if (isa<FieldDecl>(D))
return false;
return true;
}
void Sema::CheckArrayAccess(const Expr *BaseExpr, const Expr *IndexExpr,
const ArraySubscriptExpr *ASE,
bool AllowOnePastEnd, bool IndexNegated) {
// Already diagnosed by the constant evaluator.
if (isConstantEvaluated())
return;
IndexExpr = IndexExpr->IgnoreParenImpCasts();
if (IndexExpr->isValueDependent())
return;
const Type *EffectiveType =
BaseExpr->getType()->getPointeeOrArrayElementType();
BaseExpr = BaseExpr->IgnoreParenCasts();
const ConstantArrayType *ArrayTy =
Context.getAsConstantArrayType(BaseExpr->getType());
if (!ArrayTy)
return;
const Type *BaseType = ArrayTy->getElementType().getTypePtr();
if (EffectiveType->isDependentType() || BaseType->isDependentType())
return;
Expr::EvalResult Result;
if (!IndexExpr->EvaluateAsInt(Result, Context, Expr::SE_AllowSideEffects))
return;
llvm::APSInt index = Result.Val.getInt();
if (IndexNegated)
index = -index;
const NamedDecl *ND = nullptr;
if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(BaseExpr))
ND = DRE->getDecl();
if (const MemberExpr *ME = dyn_cast<MemberExpr>(BaseExpr))
ND = ME->getMemberDecl();
if (index.isUnsigned() || !index.isNegative()) {
// It is possible that the type of the base expression after
// IgnoreParenCasts is incomplete, even though the type of the base
// expression before IgnoreParenCasts is complete (see PR39746 for an
// example). In this case we have no information about whether the array
// access exceeds the array bounds. However we can still diagnose an array
// access which precedes the array bounds.
if (BaseType->isIncompleteType())
return;
llvm::APInt size = ArrayTy->getSize();
if (!size.isStrictlyPositive())
return;
if (BaseType != EffectiveType) {
// Make sure we're comparing apples to apples when comparing index to size
uint64_t ptrarith_typesize = Context.getTypeSize(EffectiveType);
uint64_t array_typesize = Context.getTypeSize(BaseType);
// Handle ptrarith_typesize being zero, such as when casting to void*
if (!ptrarith_typesize) ptrarith_typesize = 1;
if (ptrarith_typesize != array_typesize) {
// There's a cast to a different size type involved
uint64_t ratio = array_typesize / ptrarith_typesize;
// TODO: Be smarter about handling cases where array_typesize is not a
// multiple of ptrarith_typesize
if (ptrarith_typesize * ratio == array_typesize)
size *= llvm::APInt(size.getBitWidth(), ratio);
}
}
if (size.getBitWidth() > index.getBitWidth())
index = index.zext(size.getBitWidth());
else if (size.getBitWidth() < index.getBitWidth())
size = size.zext(index.getBitWidth());
// For array subscripting the index must be less than size, but for pointer
// arithmetic also allow the index (offset) to be equal to size since
// computing the next address after the end of the array is legal and
// commonly done e.g. in C++ iterators and range-based for loops.
if (AllowOnePastEnd ? index.ule(size) : index.ult(size))
return;
// Also don't warn for arrays of size 1 which are members of some
// structure. These are often used to approximate flexible arrays in C89
// code.
if (IsTailPaddedMemberArray(*this, size, ND))
return;
// Suppress the warning if the subscript expression (as identified by the
// ']' location) and the index expression are both from macro expansions
// within a system header.
if (ASE) {
SourceLocation RBracketLoc = SourceMgr.getSpellingLoc(
ASE->getRBracketLoc());
if (SourceMgr.isInSystemHeader(RBracketLoc)) {
SourceLocation IndexLoc =
SourceMgr.getSpellingLoc(IndexExpr->getBeginLoc());
if (SourceMgr.isWrittenInSameFile(RBracketLoc, IndexLoc))
return;
}
}
unsigned DiagID = diag::warn_ptr_arith_exceeds_bounds;
if (ASE)
DiagID = diag::warn_array_index_exceeds_bounds;
DiagRuntimeBehavior(BaseExpr->getBeginLoc(), BaseExpr,
PDiag(DiagID) << index.toString(10, true)
<< size.toString(10, true)
<< (unsigned)size.getLimitedValue(~0U)
<< IndexExpr->getSourceRange());
} else {
unsigned DiagID = diag::warn_array_index_precedes_bounds;
if (!ASE) {
DiagID = diag::warn_ptr_arith_precedes_bounds;
if (index.isNegative()) index = -index;
}
DiagRuntimeBehavior(BaseExpr->getBeginLoc(), BaseExpr,
PDiag(DiagID) << index.toString(10, true)
<< IndexExpr->getSourceRange());
}
if (!ND) {
// Try harder to find a NamedDecl to point at in the note.
while (const ArraySubscriptExpr *ASE =
dyn_cast<ArraySubscriptExpr>(BaseExpr))
BaseExpr = ASE->getBase()->IgnoreParenCasts();
if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(BaseExpr))
ND = DRE->getDecl();
if (const MemberExpr *ME = dyn_cast<MemberExpr>(BaseExpr))
ND = ME->getMemberDecl();
}
if (ND)
DiagRuntimeBehavior(ND->getBeginLoc(), BaseExpr,
PDiag(diag::note_array_declared_here) << ND);
}
void Sema::CheckArrayAccess(const Expr *expr) {
int AllowOnePastEnd = 0;
while (expr) {
expr = expr->IgnoreParenImpCasts();
switch (expr->getStmtClass()) {
case Stmt::ArraySubscriptExprClass: {
const ArraySubscriptExpr *ASE = cast<ArraySubscriptExpr>(expr);
CheckArrayAccess(ASE->getBase(), ASE->getIdx(), ASE,
AllowOnePastEnd > 0);
expr = ASE->getBase();
break;
}
case Stmt::MemberExprClass: {
expr = cast<MemberExpr>(expr)->getBase();
break;
}
case Stmt::OMPArraySectionExprClass: {
const OMPArraySectionExpr *ASE = cast<OMPArraySectionExpr>(expr);
if (ASE->getLowerBound())
CheckArrayAccess(ASE->getBase(), ASE->getLowerBound(),
/*ASE=*/nullptr, AllowOnePastEnd > 0);
return;
}
case Stmt::UnaryOperatorClass: {
// Only unwrap the * and & unary operators
const UnaryOperator *UO = cast<UnaryOperator>(expr);
expr = UO->getSubExpr();
switch (UO->getOpcode()) {
case UO_AddrOf:
AllowOnePastEnd++;
break;
case UO_Deref:
AllowOnePastEnd--;
break;
default:
return;
}
break;
}
case Stmt::ConditionalOperatorClass: {
const ConditionalOperator *cond = cast<ConditionalOperator>(expr);
if (const Expr *lhs = cond->getLHS())
CheckArrayAccess(lhs);
if (const Expr *rhs = cond->getRHS())
CheckArrayAccess(rhs);
return;
}
case Stmt::CXXOperatorCallExprClass: {
const auto *OCE = cast<CXXOperatorCallExpr>(expr);
for (const auto *Arg : OCE->arguments())
CheckArrayAccess(Arg);
return;
}
default:
return;
}
}
}
//===--- CHECK: Objective-C retain cycles ----------------------------------//
namespace {
struct RetainCycleOwner {
VarDecl *Variable = nullptr;
SourceRange Range;
SourceLocation Loc;
bool Indirect = false;
RetainCycleOwner() = default;
void setLocsFrom(Expr *e) {
Loc = e->getExprLoc();
Range = e->getSourceRange();
}
};
} // namespace
/// Consider whether capturing the given variable can possibly lead to
/// a retain cycle.
static bool considerVariable(VarDecl *var, Expr *ref, RetainCycleOwner &owner) {
// In ARC, it's captured strongly iff the variable has __strong
// lifetime. In MRR, it's captured strongly if the variable is
// __block and has an appropriate type.
if (var->getType().getObjCLifetime() != Qualifiers::OCL_Strong)
return false;
owner.Variable = var;
if (ref)
owner.setLocsFrom(ref);
return true;
}
static bool findRetainCycleOwner(Sema &S, Expr *e, RetainCycleOwner &owner) {
while (true) {
e = e->IgnoreParens();
if (CastExpr *cast = dyn_cast<CastExpr>(e)) {
switch (cast->getCastKind()) {
case CK_BitCast:
case CK_LValueBitCast:
case CK_LValueToRValue:
case CK_ARCReclaimReturnedObject:
e = cast->getSubExpr();
continue;
default:
return false;
}
}
if (ObjCIvarRefExpr *ref = dyn_cast<ObjCIvarRefExpr>(e)) {
ObjCIvarDecl *ivar = ref->getDecl();
if (ivar->getType().getObjCLifetime() != Qualifiers::OCL_Strong)
return false;
// Try to find a retain cycle in the base.
if (!findRetainCycleOwner(S, ref->getBase(), owner))
return false;
if (ref->isFreeIvar()) owner.setLocsFrom(ref);
owner.Indirect = true;
return true;
}
if (DeclRefExpr *ref = dyn_cast<DeclRefExpr>(e)) {
VarDecl *var = dyn_cast<VarDecl>(ref->getDecl());
if (!var) return false;
return considerVariable(var, ref, owner);
}
if (MemberExpr *member = dyn_cast<MemberExpr>(e)) {
if (member->isArrow()) return false;
// Don't count this as an indirect ownership.
e = member->getBase();
continue;
}
if (PseudoObjectExpr *pseudo = dyn_cast<PseudoObjectExpr>(e)) {
// Only pay attention to pseudo-objects on property references.
ObjCPropertyRefExpr *pre
= dyn_cast<ObjCPropertyRefExpr>(pseudo->getSyntacticForm()
->IgnoreParens());
if (!pre) return false;
if (pre->isImplicitProperty()) return false;
ObjCPropertyDecl *property = pre->getExplicitProperty();
if (!property->isRetaining() &&
!(property->getPropertyIvarDecl() &&
property->getPropertyIvarDecl()->getType()
.getObjCLifetime() == Qualifiers::OCL_Strong))
return false;
owner.Indirect = true;
if (pre->isSuperReceiver()) {
owner.Variable = S.getCurMethodDecl()->getSelfDecl();
if (!owner.Variable)
return false;
owner.Loc = pre->getLocation();
owner.Range = pre->getSourceRange();
return true;
}
e = const_cast<Expr*>(cast<OpaqueValueExpr>(pre->getBase())
->getSourceExpr());
continue;
}
// Array ivars?
return false;
}
}
namespace {
struct FindCaptureVisitor : EvaluatedExprVisitor<FindCaptureVisitor> {
ASTContext &Context;
VarDecl *Variable;
Expr *Capturer = nullptr;
bool VarWillBeReased = false;
FindCaptureVisitor(ASTContext &Context, VarDecl *variable)
: EvaluatedExprVisitor<FindCaptureVisitor>(Context),
Context(Context), Variable(variable) {}
void VisitDeclRefExpr(DeclRefExpr *ref) {
if (ref->getDecl() == Variable && !Capturer)
Capturer = ref;
}
void VisitObjCIvarRefExpr(ObjCIvarRefExpr *ref) {
if (Capturer) return;
Visit(ref->getBase());
if (Capturer && ref->isFreeIvar())
Capturer = ref;
}
void VisitBlockExpr(BlockExpr *block) {
// Look inside nested blocks
if (block->getBlockDecl()->capturesVariable(Variable))
Visit(block->getBlockDecl()->getBody());
}
void VisitOpaqueValueExpr(OpaqueValueExpr *OVE) {
if (Capturer) return;
if (OVE->getSourceExpr())
Visit(OVE->getSourceExpr());
}
void VisitBinaryOperator(BinaryOperator *BinOp) {
if (!Variable || VarWillBeReased || BinOp->getOpcode() != BO_Assign)
return;
Expr *LHS = BinOp->getLHS();
if (const DeclRefExpr *DRE = dyn_cast_or_null<DeclRefExpr>(LHS)) {
if (DRE->getDecl() != Variable)
return;
if (Expr *RHS = BinOp->getRHS()) {
RHS = RHS->IgnoreParenCasts();
Optional<llvm::APSInt> Value;
VarWillBeReased =
(RHS && (Value = RHS->getIntegerConstantExpr(Context)) &&
*Value == 0);
}
}
}
};
} // namespace
/// Check whether the given argument is a block which captures a
/// variable.
static Expr *findCapturingExpr(Sema &S, Expr *e, RetainCycleOwner &owner) {
assert(owner.Variable && owner.Loc.isValid());
e = e->IgnoreParenCasts();
// Look through [^{...} copy] and Block_copy(^{...}).
if (ObjCMessageExpr *ME = dyn_cast<ObjCMessageExpr>(e)) {
Selector Cmd = ME->getSelector();
if (Cmd.isUnarySelector() && Cmd.getNameForSlot(0) == "copy") {
e = ME->getInstanceReceiver();
if (!e)
return nullptr;
e = e->IgnoreParenCasts();
}
} else if (CallExpr *CE = dyn_cast<CallExpr>(e)) {
if (CE->getNumArgs() == 1) {
FunctionDecl *Fn = dyn_cast_or_null<FunctionDecl>(CE->getCalleeDecl());
if (Fn) {
const IdentifierInfo *FnI = Fn->getIdentifier();
if (FnI && FnI->isStr("_Block_copy")) {
e = CE->getArg(0)->IgnoreParenCasts();
}
}
}
}
BlockExpr *block = dyn_cast<BlockExpr>(e);
if (!block || !block->getBlockDecl()->capturesVariable(owner.Variable))
return nullptr;
FindCaptureVisitor visitor(S.Context, owner.Variable);
visitor.Visit(block->getBlockDecl()->getBody());
return visitor.VarWillBeReased ? nullptr : visitor.Capturer;
}
static void diagnoseRetainCycle(Sema &S, Expr *capturer,
RetainCycleOwner &owner) {
assert(capturer);
assert(owner.Variable && owner.Loc.isValid());
S.Diag(capturer->getExprLoc(), diag::warn_arc_retain_cycle)
<< owner.Variable << capturer->getSourceRange();
S.Diag(owner.Loc, diag::note_arc_retain_cycle_owner)
<< owner.Indirect << owner.Range;
}
/// Check for a keyword selector that starts with the word 'add' or
/// 'set'.
static bool isSetterLikeSelector(Selector sel) {
if (sel.isUnarySelector()) return false;
StringRef str = sel.getNameForSlot(0);
while (!str.empty() && str.front() == '_') str = str.substr(1);
if (str.startswith("set"))
str = str.substr(3);
else if (str.startswith("add")) {
// Specially allow 'addOperationWithBlock:'.
if (sel.getNumArgs() == 1 && str.startswith("addOperationWithBlock"))
return false;
str = str.substr(3);
}
else
return false;
if (str.empty()) return true;
return !isLowercase(str.front());
}
static Optional<int> GetNSMutableArrayArgumentIndex(Sema &S,
ObjCMessageExpr *Message) {
bool IsMutableArray = S.NSAPIObj->isSubclassOfNSClass(
Message->getReceiverInterface(),
NSAPI::ClassId_NSMutableArray);
if (!IsMutableArray) {
return None;
}
Selector Sel = Message->getSelector();
Optional<NSAPI::NSArrayMethodKind> MKOpt =
S.NSAPIObj->getNSArrayMethodKind(Sel);
if (!MKOpt) {
return None;
}
NSAPI::NSArrayMethodKind MK = *MKOpt;
switch (MK) {
case NSAPI::NSMutableArr_addObject:
case NSAPI::NSMutableArr_insertObjectAtIndex:
case NSAPI::NSMutableArr_setObjectAtIndexedSubscript:
return 0;
case NSAPI::NSMutableArr_replaceObjectAtIndex:
return 1;
default:
return None;
}
return None;
}
static
Optional<int> GetNSMutableDictionaryArgumentIndex(Sema &S,
ObjCMessageExpr *Message) {
bool IsMutableDictionary = S.NSAPIObj->isSubclassOfNSClass(
Message->getReceiverInterface(),
NSAPI::ClassId_NSMutableDictionary);
if (!IsMutableDictionary) {
return None;
}
Selector Sel = Message->getSelector();
Optional<NSAPI::NSDictionaryMethodKind> MKOpt =
S.NSAPIObj->getNSDictionaryMethodKind(Sel);
if (!MKOpt) {
return None;
}
NSAPI::NSDictionaryMethodKind MK = *MKOpt;
switch (MK) {
case NSAPI::NSMutableDict_setObjectForKey:
case NSAPI::NSMutableDict_setValueForKey:
case NSAPI::NSMutableDict_setObjectForKeyedSubscript:
return 0;
default:
return None;
}
return None;
}
static Optional<int> GetNSSetArgumentIndex(Sema &S, ObjCMessageExpr *Message) {
bool IsMutableSet = S.NSAPIObj->isSubclassOfNSClass(
Message->getReceiverInterface(),
NSAPI::ClassId_NSMutableSet);
bool IsMutableOrderedSet = S.NSAPIObj->isSubclassOfNSClass(
Message->getReceiverInterface(),
NSAPI::ClassId_NSMutableOrderedSet);
if (!IsMutableSet && !IsMutableOrderedSet) {
return None;
}
Selector Sel = Message->getSelector();
Optional<NSAPI::NSSetMethodKind> MKOpt = S.NSAPIObj->getNSSetMethodKind(Sel);
if (!MKOpt) {
return None;
}
NSAPI::NSSetMethodKind MK = *MKOpt;
switch (MK) {
case NSAPI::NSMutableSet_addObject:
case NSAPI::NSOrderedSet_setObjectAtIndex:
case NSAPI::NSOrderedSet_setObjectAtIndexedSubscript:
case NSAPI::NSOrderedSet_insertObjectAtIndex:
return 0;
case NSAPI::NSOrderedSet_replaceObjectAtIndexWithObject:
return 1;
}
return None;
}
void Sema::CheckObjCCircularContainer(ObjCMessageExpr *Message) {
if (!Message->isInstanceMessage()) {
return;
}
Optional<int> ArgOpt;
if (!(ArgOpt = GetNSMutableArrayArgumentIndex(*this, Message)) &&
!(ArgOpt = GetNSMutableDictionaryArgumentIndex(*this, Message)) &&
!(ArgOpt = GetNSSetArgumentIndex(*this, Message))) {
return;
}
int ArgIndex = *ArgOpt;
Expr *Arg = Message->getArg(ArgIndex)->IgnoreImpCasts();
if (OpaqueValueExpr *OE = dyn_cast<OpaqueValueExpr>(Arg)) {
Arg = OE->getSourceExpr()->IgnoreImpCasts();
}
if (Message->getReceiverKind() == ObjCMessageExpr::SuperInstance) {
if (DeclRefExpr *ArgRE = dyn_cast<DeclRefExpr>(Arg)) {
if (ArgRE->isObjCSelfExpr()) {
Diag(Message->getSourceRange().getBegin(),
diag::warn_objc_circular_container)
<< ArgRE->getDecl() << StringRef("'super'");
}
}
} else {
Expr *Receiver = Message->getInstanceReceiver()->IgnoreImpCasts();
if (OpaqueValueExpr *OE = dyn_cast<OpaqueValueExpr>(Receiver)) {
Receiver = OE->getSourceExpr()->IgnoreImpCasts();
}
if (DeclRefExpr *ReceiverRE = dyn_cast<DeclRefExpr>(Receiver)) {
if (DeclRefExpr *ArgRE = dyn_cast<DeclRefExpr>(Arg)) {
if (ReceiverRE->getDecl() == ArgRE->getDecl()) {
ValueDecl *Decl = ReceiverRE->getDecl();
Diag(Message->getSourceRange().getBegin(),
diag::warn_objc_circular_container)
<< Decl << Decl;
if (!ArgRE->isObjCSelfExpr()) {
Diag(Decl->getLocation(),
diag::note_objc_circular_container_declared_here)
<< Decl;
}
}
}
} else if (ObjCIvarRefExpr *IvarRE = dyn_cast<ObjCIvarRefExpr>(Receiver)) {
if (ObjCIvarRefExpr *IvarArgRE = dyn_cast<ObjCIvarRefExpr>(Arg)) {
if (IvarRE->getDecl() == IvarArgRE->getDecl()) {
ObjCIvarDecl *Decl = IvarRE->getDecl();
Diag(Message->getSourceRange().getBegin(),
diag::warn_objc_circular_container)
<< Decl << Decl;
Diag(Decl->getLocation(),
diag::note_objc_circular_container_declared_here)
<< Decl;
}
}
}
}
}
/// Check a message send to see if it's likely to cause a retain cycle.
void Sema::checkRetainCycles(ObjCMessageExpr *msg) {
// Only check instance methods whose selector looks like a setter.
if (!msg->isInstanceMessage() || !isSetterLikeSelector(msg->getSelector()))
return;
// Try to find a variable that the receiver is strongly owned by.
RetainCycleOwner owner;
if (msg->getReceiverKind() == ObjCMessageExpr::Instance) {
if (!findRetainCycleOwner(*this, msg->getInstanceReceiver(), owner))
return;
} else {
assert(msg->getReceiverKind() == ObjCMessageExpr::SuperInstance);
owner.Variable = getCurMethodDecl()->getSelfDecl();
owner.Loc = msg->getSuperLoc();
owner.Range = msg->getSuperLoc();
}
// Check whether the receiver is captured by any of the arguments.
const ObjCMethodDecl *MD = msg->getMethodDecl();
for (unsigned i = 0, e = msg->getNumArgs(); i != e; ++i) {
if (Expr *capturer = findCapturingExpr(*this, msg->getArg(i), owner)) {
// noescape blocks should not be retained by the method.
if (MD && MD->parameters()[i]->hasAttr<NoEscapeAttr>())
continue;
return diagnoseRetainCycle(*this, capturer, owner);
}
}
}
/// Check a property assign to see if it's likely to cause a retain cycle.
void Sema::checkRetainCycles(Expr *receiver, Expr *argument) {
RetainCycleOwner owner;
if (!findRetainCycleOwner(*this, receiver, owner))
return;
if (Expr *capturer = findCapturingExpr(*this, argument, owner))
diagnoseRetainCycle(*this, capturer, owner);
}
void Sema::checkRetainCycles(VarDecl *Var, Expr *Init) {
RetainCycleOwner Owner;
if (!considerVariable(Var, /*DeclRefExpr=*/nullptr, Owner))
return;
// Because we don't have an expression for the variable, we have to set the
// location explicitly here.
Owner.Loc = Var->getLocation();
Owner.Range = Var->getSourceRange();
if (Expr *Capturer = findCapturingExpr(*this, Init, Owner))
diagnoseRetainCycle(*this, Capturer, Owner);
}
static bool checkUnsafeAssignLiteral(Sema &S, SourceLocation Loc,
Expr *RHS, bool isProperty) {
// Check if RHS is an Objective-C object literal, which also can get
// immediately zapped in a weak reference. Note that we explicitly
// allow ObjCStringLiterals, since those are designed to never really die.
RHS = RHS->IgnoreParenImpCasts();
// This enum needs to match with the 'select' in
// warn_objc_arc_literal_assign (off-by-1).
Sema::ObjCLiteralKind Kind = S.CheckLiteralKind(RHS);
if (Kind == Sema::LK_String || Kind == Sema::LK_None)
return false;
S.Diag(Loc, diag::warn_arc_literal_assign)
<< (unsigned) Kind
<< (isProperty ? 0 : 1)
<< RHS->getSourceRange();
return true;
}
static bool checkUnsafeAssignObject(Sema &S, SourceLocation Loc,
Qualifiers::ObjCLifetime LT,
Expr *RHS, bool isProperty) {
// Strip off any implicit cast added to get to the one ARC-specific.
while (ImplicitCastExpr *cast = dyn_cast<ImplicitCastExpr>(RHS)) {
if (cast->getCastKind() == CK_ARCConsumeObject) {
S.Diag(Loc, diag::warn_arc_retained_assign)
<< (LT == Qualifiers::OCL_ExplicitNone)
<< (isProperty ? 0 : 1)
<< RHS->getSourceRange();
return true;
}
RHS = cast->getSubExpr();
}
if (LT == Qualifiers::OCL_Weak &&
checkUnsafeAssignLiteral(S, Loc, RHS, isProperty))
return true;
return false;
}
bool Sema::checkUnsafeAssigns(SourceLocation Loc,
QualType LHS, Expr *RHS) {
Qualifiers::ObjCLifetime LT = LHS.getObjCLifetime();
if (LT != Qualifiers::OCL_Weak && LT != Qualifiers::OCL_ExplicitNone)
return false;
if (checkUnsafeAssignObject(*this, Loc, LT, RHS, false))
return true;
return false;
}
void Sema::checkUnsafeExprAssigns(SourceLocation Loc,
Expr *LHS, Expr *RHS) {
QualType LHSType;
// PropertyRef on LHS type need be directly obtained from
// its declaration as it has a PseudoType.
ObjCPropertyRefExpr *PRE
= dyn_cast<ObjCPropertyRefExpr>(LHS->IgnoreParens());
if (PRE && !PRE->isImplicitProperty()) {
const ObjCPropertyDecl *PD = PRE->getExplicitProperty();
if (PD)
LHSType = PD->getType();
}
if (LHSType.isNull())
LHSType = LHS->getType();
Qualifiers::ObjCLifetime LT = LHSType.getObjCLifetime();
if (LT == Qualifiers::OCL_Weak) {
if (!Diags.isIgnored(diag::warn_arc_repeated_use_of_weak, Loc))
getCurFunction()->markSafeWeakUse(LHS);
}
if (checkUnsafeAssigns(Loc, LHSType, RHS))
return;
// FIXME. Check for other life times.
if (LT != Qualifiers::OCL_None)
return;
if (PRE) {
if (PRE->isImplicitProperty())
return;
const ObjCPropertyDecl *PD = PRE->getExplicitProperty();
if (!PD)
return;
unsigned Attributes = PD->getPropertyAttributes();
if (Attributes & ObjCPropertyAttribute::kind_assign) {
// when 'assign' attribute was not explicitly specified
// by user, ignore it and rely on property type itself
// for lifetime info.
unsigned AsWrittenAttr = PD->getPropertyAttributesAsWritten();
if (!(AsWrittenAttr & ObjCPropertyAttribute::kind_assign) &&
LHSType->isObjCRetainableType())
return;
while (ImplicitCastExpr *cast = dyn_cast<ImplicitCastExpr>(RHS)) {
if (cast->getCastKind() == CK_ARCConsumeObject) {
Diag(Loc, diag::warn_arc_retained_property_assign)
<< RHS->getSourceRange();
return;
}
RHS = cast->getSubExpr();
}
} else if (Attributes & ObjCPropertyAttribute::kind_weak) {
if (checkUnsafeAssignObject(*this, Loc, Qualifiers::OCL_Weak, RHS, true))
return;
}
}
}
//===--- CHECK: Empty statement body (-Wempty-body) ---------------------===//
static bool ShouldDiagnoseEmptyStmtBody(const SourceManager &SourceMgr,
SourceLocation StmtLoc,
const NullStmt *Body) {
// Do not warn if the body is a macro that expands to nothing, e.g:
//
// #define CALL(x)
// if (condition)
// CALL(0);
if (Body->hasLeadingEmptyMacro())
return false;
// Get line numbers of statement and body.
bool StmtLineInvalid;
unsigned StmtLine = SourceMgr.getPresumedLineNumber(StmtLoc,
&StmtLineInvalid);
if (StmtLineInvalid)
return false;
bool BodyLineInvalid;
unsigned BodyLine = SourceMgr.getSpellingLineNumber(Body->getSemiLoc(),
&BodyLineInvalid);
if (BodyLineInvalid)
return false;
// Warn if null statement and body are on the same line.
if (StmtLine != BodyLine)
return false;
return true;
}
void Sema::DiagnoseEmptyStmtBody(SourceLocation StmtLoc,
const Stmt *Body,
unsigned DiagID) {
// Since this is a syntactic check, don't emit diagnostic for template
// instantiations, this just adds noise.
if (CurrentInstantiationScope)
return;
// The body should be a null statement.
const NullStmt *NBody = dyn_cast<NullStmt>(Body);
if (!NBody)
return;
// Do the usual checks.
if (!ShouldDiagnoseEmptyStmtBody(SourceMgr, StmtLoc, NBody))
return;
Diag(NBody->getSemiLoc(), DiagID);
Diag(NBody->getSemiLoc(), diag::note_empty_body_on_separate_line);
}
void Sema::DiagnoseEmptyLoopBody(const Stmt *S,
const Stmt *PossibleBody) {
assert(!CurrentInstantiationScope); // Ensured by caller
SourceLocation StmtLoc;
const Stmt *Body;
unsigned DiagID;
if (const ForStmt *FS = dyn_cast<ForStmt>(S)) {
StmtLoc = FS->getRParenLoc();
Body = FS->getBody();
DiagID = diag::warn_empty_for_body;
} else if (const WhileStmt *WS = dyn_cast<WhileStmt>(S)) {
StmtLoc = WS->getCond()->getSourceRange().getEnd();
Body = WS->getBody();
DiagID = diag::warn_empty_while_body;
} else
return; // Neither `for' nor `while'.
// The body should be a null statement.
const NullStmt *NBody = dyn_cast<NullStmt>(Body);
if (!NBody)
return;
// Skip expensive checks if diagnostic is disabled.
if (Diags.isIgnored(DiagID, NBody->getSemiLoc()))
return;
// Do the usual checks.
if (!ShouldDiagnoseEmptyStmtBody(SourceMgr, StmtLoc, NBody))
return;
// `for(...);' and `while(...);' are popular idioms, so in order to keep
// noise level low, emit diagnostics only if for/while is followed by a
// CompoundStmt, e.g.:
// for (int i = 0; i < n; i++);
// {
// a(i);
// }
// or if for/while is followed by a statement with more indentation
// than for/while itself:
// for (int i = 0; i < n; i++);
// a(i);
bool ProbableTypo = isa<CompoundStmt>(PossibleBody);
if (!ProbableTypo) {
bool BodyColInvalid;
unsigned BodyCol = SourceMgr.getPresumedColumnNumber(
PossibleBody->getBeginLoc(), &BodyColInvalid);
if (BodyColInvalid)
return;
bool StmtColInvalid;
unsigned StmtCol =
SourceMgr.getPresumedColumnNumber(S->getBeginLoc(), &StmtColInvalid);
if (StmtColInvalid)
return;
if (BodyCol > StmtCol)
ProbableTypo = true;
}
if (ProbableTypo) {
Diag(NBody->getSemiLoc(), DiagID);
Diag(NBody->getSemiLoc(), diag::note_empty_body_on_separate_line);
}
}
//===--- CHECK: Warn on self move with std::move. -------------------------===//
/// DiagnoseSelfMove - Emits a warning if a value is moved to itself.
void Sema::DiagnoseSelfMove(const Expr *LHSExpr, const Expr *RHSExpr,
SourceLocation OpLoc) {
if (Diags.isIgnored(diag::warn_sizeof_pointer_expr_memaccess, OpLoc))
return;
if (inTemplateInstantiation())
return;
// Strip parens and casts away.
LHSExpr = LHSExpr->IgnoreParenImpCasts();
RHSExpr = RHSExpr->IgnoreParenImpCasts();
// Check for a call expression
const CallExpr *CE = dyn_cast<CallExpr>(RHSExpr);
if (!CE || CE->getNumArgs() != 1)
return;
// Check for a call to std::move
if (!CE->isCallToStdMove())
return;
// Get argument from std::move
RHSExpr = CE->getArg(0);
const DeclRefExpr *LHSDeclRef = dyn_cast<DeclRefExpr>(LHSExpr);
const DeclRefExpr *RHSDeclRef = dyn_cast<DeclRefExpr>(RHSExpr);
// Two DeclRefExpr's, check that the decls are the same.
if (LHSDeclRef && RHSDeclRef) {
if (!LHSDeclRef->getDecl() || !RHSDeclRef->getDecl())
return;
if (LHSDeclRef->getDecl()->getCanonicalDecl() !=
RHSDeclRef->getDecl()->getCanonicalDecl())
return;
Diag(OpLoc, diag::warn_self_move) << LHSExpr->getType()
<< LHSExpr->getSourceRange()
<< RHSExpr->getSourceRange();
return;
}
// Member variables require a different approach to check for self moves.
// MemberExpr's are the same if every nested MemberExpr refers to the same
// Decl and that the base Expr's are DeclRefExpr's with the same Decl or
// the base Expr's are CXXThisExpr's.
const Expr *LHSBase = LHSExpr;
const Expr *RHSBase = RHSExpr;
const MemberExpr *LHSME = dyn_cast<MemberExpr>(LHSExpr);
const MemberExpr *RHSME = dyn_cast<MemberExpr>(RHSExpr);
if (!LHSME || !RHSME)
return;
while (LHSME && RHSME) {
if (LHSME->getMemberDecl()->getCanonicalDecl() !=
RHSME->getMemberDecl()->getCanonicalDecl())
return;
LHSBase = LHSME->getBase();
RHSBase = RHSME->getBase();
LHSME = dyn_cast<MemberExpr>(LHSBase);
RHSME = dyn_cast<MemberExpr>(RHSBase);
}
LHSDeclRef = dyn_cast<DeclRefExpr>(LHSBase);
RHSDeclRef = dyn_cast<DeclRefExpr>(RHSBase);
if (LHSDeclRef && RHSDeclRef) {
if (!LHSDeclRef->getDecl() || !RHSDeclRef->getDecl())
return;
if (LHSDeclRef->getDecl()->getCanonicalDecl() !=
RHSDeclRef->getDecl()->getCanonicalDecl())
return;
Diag(OpLoc, diag::warn_self_move) << LHSExpr->getType()
<< LHSExpr->getSourceRange()
<< RHSExpr->getSourceRange();
return;
}
if (isa<CXXThisExpr>(LHSBase) && isa<CXXThisExpr>(RHSBase))
Diag(OpLoc, diag::warn_self_move) << LHSExpr->getType()
<< LHSExpr->getSourceRange()
<< RHSExpr->getSourceRange();
}
//===--- Layout compatibility ----------------------------------------------//
static bool isLayoutCompatible(ASTContext &C, QualType T1, QualType T2);
/// Check if two enumeration types are layout-compatible.
static bool isLayoutCompatible(ASTContext &C, EnumDecl *ED1, EnumDecl *ED2) {
// C++11 [dcl.enum] p8:
// Two enumeration types are layout-compatible if they have the same
// underlying type.
return ED1->isComplete() && ED2->isComplete() &&
C.hasSameType(ED1->getIntegerType(), ED2->getIntegerType());
}
/// Check if two fields are layout-compatible.
static bool isLayoutCompatible(ASTContext &C, FieldDecl *Field1,
FieldDecl *Field2) {
if (!isLayoutCompatible(C, Field1->getType(), Field2->getType()))
return false;
if (Field1->isBitField() != Field2->isBitField())
return false;
if (Field1->isBitField()) {
// Make sure that the bit-fields are the same length.
unsigned Bits1 = Field1->getBitWidthValue(C);
unsigned Bits2 = Field2->getBitWidthValue(C);
if (Bits1 != Bits2)
return false;
}
return true;
}
/// Check if two standard-layout structs are layout-compatible.
/// (C++11 [class.mem] p17)
static bool isLayoutCompatibleStruct(ASTContext &C, RecordDecl *RD1,
RecordDecl *RD2) {
// If both records are C++ classes, check that base classes match.
if (const CXXRecordDecl *D1CXX = dyn_cast<CXXRecordDecl>(RD1)) {
// If one of records is a CXXRecordDecl we are in C++ mode,
// thus the other one is a CXXRecordDecl, too.
const CXXRecordDecl *D2CXX = cast<CXXRecordDecl>(RD2);
// Check number of base classes.
if (D1CXX->getNumBases() != D2CXX->getNumBases())
return false;
// Check the base classes.
for (CXXRecordDecl::base_class_const_iterator
Base1 = D1CXX->bases_begin(),
BaseEnd1 = D1CXX->bases_end(),
Base2 = D2CXX->bases_begin();
Base1 != BaseEnd1;
++Base1, ++Base2) {
if (!isLayoutCompatible(C, Base1->getType(), Base2->getType()))
return false;
}
} else if (const CXXRecordDecl *D2CXX = dyn_cast<CXXRecordDecl>(RD2)) {
// If only RD2 is a C++ class, it should have zero base classes.
if (D2CXX->getNumBases() > 0)
return false;
}
// Check the fields.
RecordDecl::field_iterator Field2 = RD2->field_begin(),
Field2End = RD2->field_end(),
Field1 = RD1->field_begin(),
Field1End = RD1->field_end();
for ( ; Field1 != Field1End && Field2 != Field2End; ++Field1, ++Field2) {
if (!isLayoutCompatible(C, *Field1, *Field2))
return false;
}
if (Field1 != Field1End || Field2 != Field2End)
return false;
return true;
}
/// Check if two standard-layout unions are layout-compatible.
/// (C++11 [class.mem] p18)
static bool isLayoutCompatibleUnion(ASTContext &C, RecordDecl *RD1,
RecordDecl *RD2) {
llvm::SmallPtrSet<FieldDecl *, 8> UnmatchedFields;
for (auto *Field2 : RD2->fields())
UnmatchedFields.insert(Field2);
for (auto *Field1 : RD1->fields()) {
llvm::SmallPtrSet<FieldDecl *, 8>::iterator
I = UnmatchedFields.begin(),
E = UnmatchedFields.end();
for ( ; I != E; ++I) {
if (isLayoutCompatible(C, Field1, *I)) {
bool Result = UnmatchedFields.erase(*I);
(void) Result;
assert(Result);
break;
}
}
if (I == E)
return false;
}
return UnmatchedFields.empty();
}
static bool isLayoutCompatible(ASTContext &C, RecordDecl *RD1,
RecordDecl *RD2) {
if (RD1->isUnion() != RD2->isUnion())
return false;
if (RD1->isUnion())
return isLayoutCompatibleUnion(C, RD1, RD2);
else
return isLayoutCompatibleStruct(C, RD1, RD2);
}
/// Check if two types are layout-compatible in C++11 sense.
static bool isLayoutCompatible(ASTContext &C, QualType T1, QualType T2) {
if (T1.isNull() || T2.isNull())
return false;
// C++11 [basic.types] p11:
// If two types T1 and T2 are the same type, then T1 and T2 are
// layout-compatible types.
if (C.hasSameType(T1, T2))
return true;
T1 = T1.getCanonicalType().getUnqualifiedType();
T2 = T2.getCanonicalType().getUnqualifiedType();
const Type::TypeClass TC1 = T1->getTypeClass();
const Type::TypeClass TC2 = T2->getTypeClass();
if (TC1 != TC2)
return false;
if (TC1 == Type::Enum) {
return isLayoutCompatible(C,
cast<EnumType>(T1)->getDecl(),
cast<EnumType>(T2)->getDecl());
} else if (TC1 == Type::Record) {
if (!T1->isStandardLayoutType() || !T2->isStandardLayoutType())
return false;
return isLayoutCompatible(C,
cast<RecordType>(T1)->getDecl(),
cast<RecordType>(T2)->getDecl());
}
return false;
}
//===--- CHECK: pointer_with_type_tag attribute: datatypes should match ----//
/// Given a type tag expression find the type tag itself.
///
/// \param TypeExpr Type tag expression, as it appears in user's code.
///
/// \param VD Declaration of an identifier that appears in a type tag.
///
/// \param MagicValue Type tag magic value.
///
/// \param isConstantEvaluated wether the evalaution should be performed in
/// constant context.
static bool FindTypeTagExpr(const Expr *TypeExpr, const ASTContext &Ctx,
const ValueDecl **VD, uint64_t *MagicValue,
bool isConstantEvaluated) {
while(true) {
if (!TypeExpr)
return false;
TypeExpr = TypeExpr->IgnoreParenImpCasts()->IgnoreParenCasts();
switch (TypeExpr->getStmtClass()) {
case Stmt::UnaryOperatorClass: {
const UnaryOperator *UO = cast<UnaryOperator>(TypeExpr);
if (UO->getOpcode() == UO_AddrOf || UO->getOpcode() == UO_Deref) {
TypeExpr = UO->getSubExpr();
continue;
}
return false;
}
case Stmt::DeclRefExprClass: {
const DeclRefExpr *DRE = cast<DeclRefExpr>(TypeExpr);
*VD = DRE->getDecl();
return true;
}
case Stmt::IntegerLiteralClass: {
const IntegerLiteral *IL = cast<IntegerLiteral>(TypeExpr);
llvm::APInt MagicValueAPInt = IL->getValue();
if (MagicValueAPInt.getActiveBits() <= 64) {
*MagicValue = MagicValueAPInt.getZExtValue();
return true;
} else
return false;
}
case Stmt::BinaryConditionalOperatorClass:
case Stmt::ConditionalOperatorClass: {
const AbstractConditionalOperator *ACO =
cast<AbstractConditionalOperator>(TypeExpr);
bool Result;
if (ACO->getCond()->EvaluateAsBooleanCondition(Result, Ctx,
isConstantEvaluated)) {
if (Result)
TypeExpr = ACO->getTrueExpr();
else
TypeExpr = ACO->getFalseExpr();
continue;
}
return false;
}
case Stmt::BinaryOperatorClass: {
const BinaryOperator *BO = cast<BinaryOperator>(TypeExpr);
if (BO->getOpcode() == BO_Comma) {
TypeExpr = BO->getRHS();
continue;
}
return false;
}
default:
return false;
}
}
}
/// Retrieve the C type corresponding to type tag TypeExpr.
///
/// \param TypeExpr Expression that specifies a type tag.
///
/// \param MagicValues Registered magic values.
///
/// \param FoundWrongKind Set to true if a type tag was found, but of a wrong
/// kind.
///
/// \param TypeInfo Information about the corresponding C type.
///
/// \param isConstantEvaluated wether the evalaution should be performed in
/// constant context.
///
/// \returns true if the corresponding C type was found.
static bool GetMatchingCType(
const IdentifierInfo *ArgumentKind, const Expr *TypeExpr,
const ASTContext &Ctx,
const llvm::DenseMap<Sema::TypeTagMagicValue, Sema::TypeTagData>
*MagicValues,
bool &FoundWrongKind, Sema::TypeTagData &TypeInfo,
bool isConstantEvaluated) {
FoundWrongKind = false;
// Variable declaration that has type_tag_for_datatype attribute.
const ValueDecl *VD = nullptr;
uint64_t MagicValue;
if (!FindTypeTagExpr(TypeExpr, Ctx, &VD, &MagicValue, isConstantEvaluated))
return false;
if (VD) {
if (TypeTagForDatatypeAttr *I = VD->getAttr<TypeTagForDatatypeAttr>()) {
if (I->getArgumentKind() != ArgumentKind) {
FoundWrongKind = true;
return false;
}
TypeInfo.Type = I->getMatchingCType();
TypeInfo.LayoutCompatible = I->getLayoutCompatible();
TypeInfo.MustBeNull = I->getMustBeNull();
return true;
}
return false;
}
if (!MagicValues)
return false;
llvm::DenseMap<Sema::TypeTagMagicValue,
Sema::TypeTagData>::const_iterator I =
MagicValues->find(std::make_pair(ArgumentKind, MagicValue));
if (I == MagicValues->end())
return false;
TypeInfo = I->second;
return true;
}
void Sema::RegisterTypeTagForDatatype(const IdentifierInfo *ArgumentKind,
uint64_t MagicValue, QualType Type,
bool LayoutCompatible,
bool MustBeNull) {
if (!TypeTagForDatatypeMagicValues)
TypeTagForDatatypeMagicValues.reset(
new llvm::DenseMap<TypeTagMagicValue, TypeTagData>);
TypeTagMagicValue Magic(ArgumentKind, MagicValue);
(*TypeTagForDatatypeMagicValues)[Magic] =
TypeTagData(Type, LayoutCompatible, MustBeNull);
}
static bool IsSameCharType(QualType T1, QualType T2) {
const BuiltinType *BT1 = T1->getAs<BuiltinType>();
if (!BT1)
return false;
const BuiltinType *BT2 = T2->getAs<BuiltinType>();
if (!BT2)
return false;
BuiltinType::Kind T1Kind = BT1->getKind();
BuiltinType::Kind T2Kind = BT2->getKind();
return (T1Kind == BuiltinType::SChar && T2Kind == BuiltinType::Char_S) ||
(T1Kind == BuiltinType::UChar && T2Kind == BuiltinType::Char_U) ||
(T1Kind == BuiltinType::Char_U && T2Kind == BuiltinType::UChar) ||
(T1Kind == BuiltinType::Char_S && T2Kind == BuiltinType::SChar);
}
void Sema::CheckArgumentWithTypeTag(const ArgumentWithTypeTagAttr *Attr,
const ArrayRef<const Expr *> ExprArgs,
SourceLocation CallSiteLoc) {
const IdentifierInfo *ArgumentKind = Attr->getArgumentKind();
bool IsPointerAttr = Attr->getIsPointer();
// Retrieve the argument representing the 'type_tag'.
unsigned TypeTagIdxAST = Attr->getTypeTagIdx().getASTIndex();
if (TypeTagIdxAST >= ExprArgs.size()) {
Diag(CallSiteLoc, diag::err_tag_index_out_of_range)
<< 0 << Attr->getTypeTagIdx().getSourceIndex();
return;
}
const Expr *TypeTagExpr = ExprArgs[TypeTagIdxAST];
bool FoundWrongKind;
TypeTagData TypeInfo;
if (!GetMatchingCType(ArgumentKind, TypeTagExpr, Context,
TypeTagForDatatypeMagicValues.get(), FoundWrongKind,
TypeInfo, isConstantEvaluated())) {
if (FoundWrongKind)
Diag(TypeTagExpr->getExprLoc(),
diag::warn_type_tag_for_datatype_wrong_kind)
<< TypeTagExpr->getSourceRange();
return;
}
// Retrieve the argument representing the 'arg_idx'.
unsigned ArgumentIdxAST = Attr->getArgumentIdx().getASTIndex();
if (ArgumentIdxAST >= ExprArgs.size()) {
Diag(CallSiteLoc, diag::err_tag_index_out_of_range)
<< 1 << Attr->getArgumentIdx().getSourceIndex();
return;
}
const Expr *ArgumentExpr = ExprArgs[ArgumentIdxAST];
if (IsPointerAttr) {
// Skip implicit cast of pointer to `void *' (as a function argument).
if (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(ArgumentExpr))
if (ICE->getType()->isVoidPointerType() &&
ICE->getCastKind() == CK_BitCast)
ArgumentExpr = ICE->getSubExpr();
}
QualType ArgumentType = ArgumentExpr->getType();
// Passing a `void*' pointer shouldn't trigger a warning.
if (IsPointerAttr && ArgumentType->isVoidPointerType())
return;
if (TypeInfo.MustBeNull) {
// Type tag with matching void type requires a null pointer.
if (!ArgumentExpr->isNullPointerConstant(Context,
Expr::NPC_ValueDependentIsNotNull)) {
Diag(ArgumentExpr->getExprLoc(),
diag::warn_type_safety_null_pointer_required)
<< ArgumentKind->getName()
<< ArgumentExpr->getSourceRange()
<< TypeTagExpr->getSourceRange();
}
return;
}
QualType RequiredType = TypeInfo.Type;
if (IsPointerAttr)
RequiredType = Context.getPointerType(RequiredType);
bool mismatch = false;
if (!TypeInfo.LayoutCompatible) {
mismatch = !Context.hasSameType(ArgumentType, RequiredType);
// C++11 [basic.fundamental] p1:
// Plain char, signed char, and unsigned char are three distinct types.
//
// But we treat plain `char' as equivalent to `signed char' or `unsigned
// char' depending on the current char signedness mode.
if (mismatch)
if ((IsPointerAttr && IsSameCharType(ArgumentType->getPointeeType(),
RequiredType->getPointeeType())) ||
(!IsPointerAttr && IsSameCharType(ArgumentType, RequiredType)))
mismatch = false;
} else
if (IsPointerAttr)
mismatch = !isLayoutCompatible(Context,
ArgumentType->getPointeeType(),
RequiredType->getPointeeType());
else
mismatch = !isLayoutCompatible(Context, ArgumentType, RequiredType);
if (mismatch)
Diag(ArgumentExpr->getExprLoc(), diag::warn_type_safety_type_mismatch)
<< ArgumentType << ArgumentKind
<< TypeInfo.LayoutCompatible << RequiredType
<< ArgumentExpr->getSourceRange()
<< TypeTagExpr->getSourceRange();
}
void Sema::AddPotentialMisalignedMembers(Expr *E, RecordDecl *RD, ValueDecl *MD,
CharUnits Alignment) {
MisalignedMembers.emplace_back(E, RD, MD, Alignment);
}
void Sema::DiagnoseMisalignedMembers() {
for (MisalignedMember &m : MisalignedMembers) {
const NamedDecl *ND = m.RD;
if (ND->getName().empty()) {
if (const TypedefNameDecl *TD = m.RD->getTypedefNameForAnonDecl())
ND = TD;
}
Diag(m.E->getBeginLoc(), diag::warn_taking_address_of_packed_member)
<< m.MD << ND << m.E->getSourceRange();
}
MisalignedMembers.clear();
}
void Sema::DiscardMisalignedMemberAddress(const Type *T, Expr *E) {
E = E->IgnoreParens();
if (!T->isPointerType() && !T->isIntegerType())
return;
if (isa<UnaryOperator>(E) &&
cast<UnaryOperator>(E)->getOpcode() == UO_AddrOf) {
auto *Op = cast<UnaryOperator>(E)->getSubExpr()->IgnoreParens();
if (isa<MemberExpr>(Op)) {
auto MA = llvm::find(MisalignedMembers, MisalignedMember(Op));
if (MA != MisalignedMembers.end() &&
(T->isIntegerType() ||
(T->isPointerType() && (T->getPointeeType()->isIncompleteType() ||
Context.getTypeAlignInChars(
T->getPointeeType()) <= MA->Alignment))))
MisalignedMembers.erase(MA);
}
}
}
void Sema::RefersToMemberWithReducedAlignment(
Expr *E,
llvm::function_ref<void(Expr *, RecordDecl *, FieldDecl *, CharUnits)>
Action) {
const auto *ME = dyn_cast<MemberExpr>(E);
if (!ME)
return;
// No need to check expressions with an __unaligned-qualified type.
if (E->getType().getQualifiers().hasUnaligned())
return;
// For a chain of MemberExpr like "a.b.c.d" this list
// will keep FieldDecl's like [d, c, b].
SmallVector<FieldDecl *, 4> ReverseMemberChain;
const MemberExpr *TopME = nullptr;
bool AnyIsPacked = false;
do {
QualType BaseType = ME->getBase()->getType();
if (BaseType->isDependentType())
return;
if (ME->isArrow())
BaseType = BaseType->getPointeeType();
RecordDecl *RD = BaseType->castAs<RecordType>()->getDecl();
if (RD->isInvalidDecl())
return;
ValueDecl *MD = ME->getMemberDecl();
auto *FD = dyn_cast<FieldDecl>(MD);
// We do not care about non-data members.
if (!FD || FD->isInvalidDecl())
return;
AnyIsPacked =
AnyIsPacked || (RD->hasAttr<PackedAttr>() || MD->hasAttr<PackedAttr>());
ReverseMemberChain.push_back(FD);
TopME = ME;
ME = dyn_cast<MemberExpr>(ME->getBase()->IgnoreParens());
} while (ME);
assert(TopME && "We did not compute a topmost MemberExpr!");
// Not the scope of this diagnostic.
if (!AnyIsPacked)
return;
const Expr *TopBase = TopME->getBase()->IgnoreParenImpCasts();
const auto *DRE = dyn_cast<DeclRefExpr>(TopBase);
// TODO: The innermost base of the member expression may be too complicated.
// For now, just disregard these cases. This is left for future
// improvement.
if (!DRE && !isa<CXXThisExpr>(TopBase))
return;
// Alignment expected by the whole expression.
CharUnits ExpectedAlignment = Context.getTypeAlignInChars(E->getType());
// No need to do anything else with this case.
if (ExpectedAlignment.isOne())
return;
// Synthesize offset of the whole access.
CharUnits Offset;
for (auto I = ReverseMemberChain.rbegin(); I != ReverseMemberChain.rend();
I++) {
Offset += Context.toCharUnitsFromBits(Context.getFieldOffset(*I));
}
// Compute the CompleteObjectAlignment as the alignment of the whole chain.
CharUnits CompleteObjectAlignment = Context.getTypeAlignInChars(
ReverseMemberChain.back()->getParent()->getTypeForDecl());
// The base expression of the innermost MemberExpr may give
// stronger guarantees than the class containing the member.
if (DRE && !TopME->isArrow()) {
const ValueDecl *VD = DRE->getDecl();
if (!VD->getType()->isReferenceType())
CompleteObjectAlignment =
std::max(CompleteObjectAlignment, Context.getDeclAlign(VD));
}
// Check if the synthesized offset fulfills the alignment.
if (Offset % ExpectedAlignment != 0 ||
// It may fulfill the offset it but the effective alignment may still be
// lower than the expected expression alignment.
CompleteObjectAlignment < ExpectedAlignment) {
// If this happens, we want to determine a sensible culprit of this.
// Intuitively, watching the chain of member expressions from right to
// left, we start with the required alignment (as required by the field
// type) but some packed attribute in that chain has reduced the alignment.
// It may happen that another packed structure increases it again. But if
// we are here such increase has not been enough. So pointing the first
// FieldDecl that either is packed or else its RecordDecl is,
// seems reasonable.
FieldDecl *FD = nullptr;
CharUnits Alignment;
for (FieldDecl *FDI : ReverseMemberChain) {
if (FDI->hasAttr<PackedAttr>() ||
FDI->getParent()->hasAttr<PackedAttr>()) {
FD = FDI;
Alignment = std::min(
Context.getTypeAlignInChars(FD->getType()),
Context.getTypeAlignInChars(FD->getParent()->getTypeForDecl()));
break;
}
}
assert(FD && "We did not find a packed FieldDecl!");
Action(E, FD->getParent(), FD, Alignment);
}
}
void Sema::CheckAddressOfPackedMember(Expr *rhs) {
using namespace std::placeholders;
RefersToMemberWithReducedAlignment(
rhs, std::bind(&Sema::AddPotentialMisalignedMembers, std::ref(*this), _1,
_2, _3, _4));
}
ExprResult Sema::SemaBuiltinMatrixTranspose(CallExpr *TheCall,
ExprResult CallResult) {
if (checkArgCount(*this, TheCall, 1))
return ExprError();
ExprResult MatrixArg = DefaultLvalueConversion(TheCall->getArg(0));
if (MatrixArg.isInvalid())
return MatrixArg;
Expr *Matrix = MatrixArg.get();
auto *MType = Matrix->getType()->getAs<ConstantMatrixType>();
if (!MType) {
Diag(Matrix->getBeginLoc(), diag::err_builtin_matrix_arg);
return ExprError();
}
// Create returned matrix type by swapping rows and columns of the argument
// matrix type.
QualType ResultType = Context.getConstantMatrixType(
MType->getElementType(), MType->getNumColumns(), MType->getNumRows());
// Change the return type to the type of the returned matrix.
TheCall->setType(ResultType);
// Update call argument to use the possibly converted matrix argument.
TheCall->setArg(0, Matrix);
return CallResult;
}
// Get and verify the matrix dimensions.
static llvm::Optional<unsigned>
getAndVerifyMatrixDimension(Expr *Expr, StringRef Name, Sema &S) {
SourceLocation ErrorPos;
Optional<llvm::APSInt> Value =
Expr->getIntegerConstantExpr(S.Context, &ErrorPos);
if (!Value) {
S.Diag(Expr->getBeginLoc(), diag::err_builtin_matrix_scalar_unsigned_arg)
<< Name;
return {};
}
uint64_t Dim = Value->getZExtValue();
if (!ConstantMatrixType::isDimensionValid(Dim)) {
S.Diag(Expr->getBeginLoc(), diag::err_builtin_matrix_invalid_dimension)
<< Name << ConstantMatrixType::getMaxElementsPerDimension();
return {};
}
return Dim;
}
ExprResult Sema::SemaBuiltinMatrixColumnMajorLoad(CallExpr *TheCall,
ExprResult CallResult) {
if (!getLangOpts().MatrixTypes) {
Diag(TheCall->getBeginLoc(), diag::err_builtin_matrix_disabled);
return ExprError();
}
if (checkArgCount(*this, TheCall, 4))
return ExprError();
unsigned PtrArgIdx = 0;
Expr *PtrExpr = TheCall->getArg(PtrArgIdx);
Expr *RowsExpr = TheCall->getArg(1);
Expr *ColumnsExpr = TheCall->getArg(2);
Expr *StrideExpr = TheCall->getArg(3);
bool ArgError = false;
// Check pointer argument.
{
ExprResult PtrConv = DefaultFunctionArrayLvalueConversion(PtrExpr);
if (PtrConv.isInvalid())
return PtrConv;
PtrExpr = PtrConv.get();
TheCall->setArg(0, PtrExpr);
if (PtrExpr->isTypeDependent()) {
TheCall->setType(Context.DependentTy);
return TheCall;
}
}
auto *PtrTy = PtrExpr->getType()->getAs<PointerType>();
QualType ElementTy;
if (!PtrTy) {
Diag(PtrExpr->getBeginLoc(), diag::err_builtin_matrix_pointer_arg)
<< PtrArgIdx + 1;
ArgError = true;
} else {
ElementTy = PtrTy->getPointeeType().getUnqualifiedType();
if (!ConstantMatrixType::isValidElementType(ElementTy)) {
Diag(PtrExpr->getBeginLoc(), diag::err_builtin_matrix_pointer_arg)
<< PtrArgIdx + 1;
ArgError = true;
}
}
// Apply default Lvalue conversions and convert the expression to size_t.
auto ApplyArgumentConversions = [this](Expr *E) {
ExprResult Conv = DefaultLvalueConversion(E);
if (Conv.isInvalid())
return Conv;
return tryConvertExprToType(Conv.get(), Context.getSizeType());
};
// Apply conversion to row and column expressions.
ExprResult RowsConv = ApplyArgumentConversions(RowsExpr);
if (!RowsConv.isInvalid()) {
RowsExpr = RowsConv.get();
TheCall->setArg(1, RowsExpr);
} else
RowsExpr = nullptr;
ExprResult ColumnsConv = ApplyArgumentConversions(ColumnsExpr);
if (!ColumnsConv.isInvalid()) {
ColumnsExpr = ColumnsConv.get();
TheCall->setArg(2, ColumnsExpr);
} else
ColumnsExpr = nullptr;
// If any any part of the result matrix type is still pending, just use
// Context.DependentTy, until all parts are resolved.
if ((RowsExpr && RowsExpr->isTypeDependent()) ||
(ColumnsExpr && ColumnsExpr->isTypeDependent())) {
TheCall->setType(Context.DependentTy);
return CallResult;
}
// Check row and column dimenions.
llvm::Optional<unsigned> MaybeRows;
if (RowsExpr)
MaybeRows = getAndVerifyMatrixDimension(RowsExpr, "row", *this);
llvm::Optional<unsigned> MaybeColumns;
if (ColumnsExpr)
MaybeColumns = getAndVerifyMatrixDimension(ColumnsExpr, "column", *this);
// Check stride argument.
ExprResult StrideConv = ApplyArgumentConversions(StrideExpr);
if (StrideConv.isInvalid())
return ExprError();
StrideExpr = StrideConv.get();
TheCall->setArg(3, StrideExpr);
if (MaybeRows) {
if (Optional<llvm::APSInt> Value =
StrideExpr->getIntegerConstantExpr(Context)) {
uint64_t Stride = Value->getZExtValue();
if (Stride < *MaybeRows) {
Diag(StrideExpr->getBeginLoc(),
diag::err_builtin_matrix_stride_too_small);
ArgError = true;
}
}
}
if (ArgError || !MaybeRows || !MaybeColumns)
return ExprError();
TheCall->setType(
Context.getConstantMatrixType(ElementTy, *MaybeRows, *MaybeColumns));
return CallResult;
}
ExprResult Sema::SemaBuiltinMatrixColumnMajorStore(CallExpr *TheCall,
ExprResult CallResult) {
if (checkArgCount(*this, TheCall, 3))
return ExprError();
unsigned PtrArgIdx = 1;
Expr *MatrixExpr = TheCall->getArg(0);
Expr *PtrExpr = TheCall->getArg(PtrArgIdx);
Expr *StrideExpr = TheCall->getArg(2);
bool ArgError = false;
{
ExprResult MatrixConv = DefaultLvalueConversion(MatrixExpr);
if (MatrixConv.isInvalid())
return MatrixConv;
MatrixExpr = MatrixConv.get();
TheCall->setArg(0, MatrixExpr);
}
if (MatrixExpr->isTypeDependent()) {
TheCall->setType(Context.DependentTy);
return TheCall;
}
auto *MatrixTy = MatrixExpr->getType()->getAs<ConstantMatrixType>();
if (!MatrixTy) {
Diag(MatrixExpr->getBeginLoc(), diag::err_builtin_matrix_arg) << 0;
ArgError = true;
}
{
ExprResult PtrConv = DefaultFunctionArrayLvalueConversion(PtrExpr);
if (PtrConv.isInvalid())
return PtrConv;
PtrExpr = PtrConv.get();
TheCall->setArg(1, PtrExpr);
if (PtrExpr->isTypeDependent()) {
TheCall->setType(Context.DependentTy);
return TheCall;
}
}
// Check pointer argument.
auto *PtrTy = PtrExpr->getType()->getAs<PointerType>();
if (!PtrTy) {
Diag(PtrExpr->getBeginLoc(), diag::err_builtin_matrix_pointer_arg)
<< PtrArgIdx + 1;
ArgError = true;
} else {
QualType ElementTy = PtrTy->getPointeeType();
if (ElementTy.isConstQualified()) {
Diag(PtrExpr->getBeginLoc(), diag::err_builtin_matrix_store_to_const);
ArgError = true;
}
ElementTy = ElementTy.getUnqualifiedType().getCanonicalType();
if (MatrixTy &&
!Context.hasSameType(ElementTy, MatrixTy->getElementType())) {
Diag(PtrExpr->getBeginLoc(),
diag::err_builtin_matrix_pointer_arg_mismatch)
<< ElementTy << MatrixTy->getElementType();
ArgError = true;
}
}
// Apply default Lvalue conversions and convert the stride expression to
// size_t.
{
ExprResult StrideConv = DefaultLvalueConversion(StrideExpr);
if (StrideConv.isInvalid())
return StrideConv;
StrideConv = tryConvertExprToType(StrideConv.get(), Context.getSizeType());
if (StrideConv.isInvalid())
return StrideConv;
StrideExpr = StrideConv.get();
TheCall->setArg(2, StrideExpr);
}
// Check stride argument.
if (MatrixTy) {
if (Optional<llvm::APSInt> Value =
StrideExpr->getIntegerConstantExpr(Context)) {
uint64_t Stride = Value->getZExtValue();
if (Stride < MatrixTy->getNumRows()) {
Diag(StrideExpr->getBeginLoc(),
diag::err_builtin_matrix_stride_too_small);
ArgError = true;
}
}
}
if (ArgError)
return ExprError();
return CallResult;
}
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