forked from OSchip/llvm-project
4264 lines
165 KiB
C++
4264 lines
165 KiB
C++
//===--- CGExpr.cpp - Emit LLVM Code from Expressions ---------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This contains code to emit Expr nodes as LLVM code.
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//
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//===----------------------------------------------------------------------===//
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#include "CGCXXABI.h"
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#include "CGCall.h"
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#include "CGCleanup.h"
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#include "CGDebugInfo.h"
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#include "CGObjCRuntime.h"
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#include "CGOpenMPRuntime.h"
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#include "CGRecordLayout.h"
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#include "CodeGenFunction.h"
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#include "CodeGenModule.h"
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#include "TargetInfo.h"
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#include "clang/AST/ASTContext.h"
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#include "clang/AST/Attr.h"
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#include "clang/AST/DeclObjC.h"
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#include "clang/Frontend/CodeGenOptions.h"
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#include "llvm/ADT/Hashing.h"
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#include "llvm/ADT/StringExtras.h"
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#include "llvm/IR/DataLayout.h"
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#include "llvm/IR/Intrinsics.h"
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#include "llvm/IR/LLVMContext.h"
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#include "llvm/IR/MDBuilder.h"
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#include "llvm/Support/ConvertUTF.h"
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#include "llvm/Support/MathExtras.h"
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#include "llvm/Support/Path.h"
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#include "llvm/Transforms/Utils/SanitizerStats.h"
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using namespace clang;
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using namespace CodeGen;
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//===--------------------------------------------------------------------===//
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// Miscellaneous Helper Methods
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//===--------------------------------------------------------------------===//
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llvm::Value *CodeGenFunction::EmitCastToVoidPtr(llvm::Value *value) {
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unsigned addressSpace =
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cast<llvm::PointerType>(value->getType())->getAddressSpace();
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llvm::PointerType *destType = Int8PtrTy;
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if (addressSpace)
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destType = llvm::Type::getInt8PtrTy(getLLVMContext(), addressSpace);
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if (value->getType() == destType) return value;
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return Builder.CreateBitCast(value, destType);
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}
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/// CreateTempAlloca - This creates a alloca and inserts it into the entry
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/// block.
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Address CodeGenFunction::CreateTempAlloca(llvm::Type *Ty, CharUnits Align,
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const Twine &Name) {
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auto Alloca = CreateTempAlloca(Ty, Name);
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Alloca->setAlignment(Align.getQuantity());
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return Address(Alloca, Align);
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}
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/// CreateTempAlloca - This creates a alloca and inserts it into the entry
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/// block.
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llvm::AllocaInst *CodeGenFunction::CreateTempAlloca(llvm::Type *Ty,
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const Twine &Name) {
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return new llvm::AllocaInst(Ty, nullptr, Name, AllocaInsertPt);
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}
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/// CreateDefaultAlignTempAlloca - This creates an alloca with the
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/// default alignment of the corresponding LLVM type, which is *not*
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/// guaranteed to be related in any way to the expected alignment of
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/// an AST type that might have been lowered to Ty.
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Address CodeGenFunction::CreateDefaultAlignTempAlloca(llvm::Type *Ty,
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const Twine &Name) {
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CharUnits Align =
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CharUnits::fromQuantity(CGM.getDataLayout().getABITypeAlignment(Ty));
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return CreateTempAlloca(Ty, Align, Name);
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}
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void CodeGenFunction::InitTempAlloca(Address Var, llvm::Value *Init) {
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assert(isa<llvm::AllocaInst>(Var.getPointer()));
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auto *Store = new llvm::StoreInst(Init, Var.getPointer());
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Store->setAlignment(Var.getAlignment().getQuantity());
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llvm::BasicBlock *Block = AllocaInsertPt->getParent();
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Block->getInstList().insertAfter(AllocaInsertPt->getIterator(), Store);
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}
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Address CodeGenFunction::CreateIRTemp(QualType Ty, const Twine &Name) {
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CharUnits Align = getContext().getTypeAlignInChars(Ty);
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return CreateTempAlloca(ConvertType(Ty), Align, Name);
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}
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Address CodeGenFunction::CreateMemTemp(QualType Ty, const Twine &Name) {
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// FIXME: Should we prefer the preferred type alignment here?
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return CreateMemTemp(Ty, getContext().getTypeAlignInChars(Ty), Name);
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}
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Address CodeGenFunction::CreateMemTemp(QualType Ty, CharUnits Align,
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const Twine &Name) {
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return CreateTempAlloca(ConvertTypeForMem(Ty), Align, Name);
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}
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/// EvaluateExprAsBool - Perform the usual unary conversions on the specified
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/// expression and compare the result against zero, returning an Int1Ty value.
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llvm::Value *CodeGenFunction::EvaluateExprAsBool(const Expr *E) {
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PGO.setCurrentStmt(E);
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if (const MemberPointerType *MPT = E->getType()->getAs<MemberPointerType>()) {
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llvm::Value *MemPtr = EmitScalarExpr(E);
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return CGM.getCXXABI().EmitMemberPointerIsNotNull(*this, MemPtr, MPT);
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}
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QualType BoolTy = getContext().BoolTy;
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SourceLocation Loc = E->getExprLoc();
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if (!E->getType()->isAnyComplexType())
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return EmitScalarConversion(EmitScalarExpr(E), E->getType(), BoolTy, Loc);
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return EmitComplexToScalarConversion(EmitComplexExpr(E), E->getType(), BoolTy,
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Loc);
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}
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/// EmitIgnoredExpr - Emit code to compute the specified expression,
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/// ignoring the result.
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void CodeGenFunction::EmitIgnoredExpr(const Expr *E) {
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if (E->isRValue())
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return (void) EmitAnyExpr(E, AggValueSlot::ignored(), true);
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// Just emit it as an l-value and drop the result.
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EmitLValue(E);
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}
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/// EmitAnyExpr - Emit code to compute the specified expression which
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/// can have any type. The result is returned as an RValue struct.
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/// If this is an aggregate expression, AggSlot indicates where the
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/// result should be returned.
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RValue CodeGenFunction::EmitAnyExpr(const Expr *E,
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AggValueSlot aggSlot,
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bool ignoreResult) {
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switch (getEvaluationKind(E->getType())) {
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case TEK_Scalar:
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return RValue::get(EmitScalarExpr(E, ignoreResult));
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case TEK_Complex:
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return RValue::getComplex(EmitComplexExpr(E, ignoreResult, ignoreResult));
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case TEK_Aggregate:
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if (!ignoreResult && aggSlot.isIgnored())
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aggSlot = CreateAggTemp(E->getType(), "agg-temp");
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EmitAggExpr(E, aggSlot);
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return aggSlot.asRValue();
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}
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llvm_unreachable("bad evaluation kind");
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}
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/// EmitAnyExprToTemp - Similary to EmitAnyExpr(), however, the result will
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/// always be accessible even if no aggregate location is provided.
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RValue CodeGenFunction::EmitAnyExprToTemp(const Expr *E) {
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AggValueSlot AggSlot = AggValueSlot::ignored();
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if (hasAggregateEvaluationKind(E->getType()))
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AggSlot = CreateAggTemp(E->getType(), "agg.tmp");
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return EmitAnyExpr(E, AggSlot);
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}
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/// EmitAnyExprToMem - Evaluate an expression into a given memory
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/// location.
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void CodeGenFunction::EmitAnyExprToMem(const Expr *E,
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Address Location,
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Qualifiers Quals,
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bool IsInit) {
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// FIXME: This function should take an LValue as an argument.
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switch (getEvaluationKind(E->getType())) {
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case TEK_Complex:
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EmitComplexExprIntoLValue(E, MakeAddrLValue(Location, E->getType()),
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/*isInit*/ false);
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return;
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case TEK_Aggregate: {
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EmitAggExpr(E, AggValueSlot::forAddr(Location, Quals,
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AggValueSlot::IsDestructed_t(IsInit),
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AggValueSlot::DoesNotNeedGCBarriers,
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AggValueSlot::IsAliased_t(!IsInit)));
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return;
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}
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case TEK_Scalar: {
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RValue RV = RValue::get(EmitScalarExpr(E, /*Ignore*/ false));
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LValue LV = MakeAddrLValue(Location, E->getType());
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EmitStoreThroughLValue(RV, LV);
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return;
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}
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}
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llvm_unreachable("bad evaluation kind");
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}
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static void
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pushTemporaryCleanup(CodeGenFunction &CGF, const MaterializeTemporaryExpr *M,
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const Expr *E, Address ReferenceTemporary) {
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// Objective-C++ ARC:
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// If we are binding a reference to a temporary that has ownership, we
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// need to perform retain/release operations on the temporary.
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//
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// FIXME: This should be looking at E, not M.
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if (auto Lifetime = M->getType().getObjCLifetime()) {
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switch (Lifetime) {
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case Qualifiers::OCL_None:
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case Qualifiers::OCL_ExplicitNone:
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// Carry on to normal cleanup handling.
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break;
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case Qualifiers::OCL_Autoreleasing:
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// Nothing to do; cleaned up by an autorelease pool.
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return;
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case Qualifiers::OCL_Strong:
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case Qualifiers::OCL_Weak:
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switch (StorageDuration Duration = M->getStorageDuration()) {
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case SD_Static:
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// Note: we intentionally do not register a cleanup to release
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// the object on program termination.
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return;
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case SD_Thread:
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// FIXME: We should probably register a cleanup in this case.
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return;
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case SD_Automatic:
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case SD_FullExpression:
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CodeGenFunction::Destroyer *Destroy;
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CleanupKind CleanupKind;
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if (Lifetime == Qualifiers::OCL_Strong) {
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const ValueDecl *VD = M->getExtendingDecl();
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bool Precise =
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VD && isa<VarDecl>(VD) && VD->hasAttr<ObjCPreciseLifetimeAttr>();
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CleanupKind = CGF.getARCCleanupKind();
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Destroy = Precise ? &CodeGenFunction::destroyARCStrongPrecise
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: &CodeGenFunction::destroyARCStrongImprecise;
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} else {
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// __weak objects always get EH cleanups; otherwise, exceptions
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// could cause really nasty crashes instead of mere leaks.
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CleanupKind = NormalAndEHCleanup;
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Destroy = &CodeGenFunction::destroyARCWeak;
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}
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if (Duration == SD_FullExpression)
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CGF.pushDestroy(CleanupKind, ReferenceTemporary,
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M->getType(), *Destroy,
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CleanupKind & EHCleanup);
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else
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CGF.pushLifetimeExtendedDestroy(CleanupKind, ReferenceTemporary,
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M->getType(),
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*Destroy, CleanupKind & EHCleanup);
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return;
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case SD_Dynamic:
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llvm_unreachable("temporary cannot have dynamic storage duration");
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}
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llvm_unreachable("unknown storage duration");
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}
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}
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CXXDestructorDecl *ReferenceTemporaryDtor = nullptr;
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if (const RecordType *RT =
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E->getType()->getBaseElementTypeUnsafe()->getAs<RecordType>()) {
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// Get the destructor for the reference temporary.
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auto *ClassDecl = cast<CXXRecordDecl>(RT->getDecl());
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if (!ClassDecl->hasTrivialDestructor())
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ReferenceTemporaryDtor = ClassDecl->getDestructor();
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}
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if (!ReferenceTemporaryDtor)
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return;
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// Call the destructor for the temporary.
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switch (M->getStorageDuration()) {
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case SD_Static:
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case SD_Thread: {
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llvm::Constant *CleanupFn;
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llvm::Constant *CleanupArg;
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if (E->getType()->isArrayType()) {
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CleanupFn = CodeGenFunction(CGF.CGM).generateDestroyHelper(
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ReferenceTemporary, E->getType(),
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CodeGenFunction::destroyCXXObject, CGF.getLangOpts().Exceptions,
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dyn_cast_or_null<VarDecl>(M->getExtendingDecl()));
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CleanupArg = llvm::Constant::getNullValue(CGF.Int8PtrTy);
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} else {
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CleanupFn = CGF.CGM.getAddrOfCXXStructor(ReferenceTemporaryDtor,
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StructorType::Complete);
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CleanupArg = cast<llvm::Constant>(ReferenceTemporary.getPointer());
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}
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CGF.CGM.getCXXABI().registerGlobalDtor(
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CGF, *cast<VarDecl>(M->getExtendingDecl()), CleanupFn, CleanupArg);
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break;
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}
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case SD_FullExpression:
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CGF.pushDestroy(NormalAndEHCleanup, ReferenceTemporary, E->getType(),
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CodeGenFunction::destroyCXXObject,
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CGF.getLangOpts().Exceptions);
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break;
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case SD_Automatic:
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CGF.pushLifetimeExtendedDestroy(NormalAndEHCleanup,
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ReferenceTemporary, E->getType(),
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CodeGenFunction::destroyCXXObject,
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CGF.getLangOpts().Exceptions);
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break;
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case SD_Dynamic:
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llvm_unreachable("temporary cannot have dynamic storage duration");
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}
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}
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static Address
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createReferenceTemporary(CodeGenFunction &CGF,
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const MaterializeTemporaryExpr *M, const Expr *Inner) {
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switch (M->getStorageDuration()) {
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case SD_FullExpression:
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case SD_Automatic: {
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// If we have a constant temporary array or record try to promote it into a
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// constant global under the same rules a normal constant would've been
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// promoted. This is easier on the optimizer and generally emits fewer
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// instructions.
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QualType Ty = Inner->getType();
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if (CGF.CGM.getCodeGenOpts().MergeAllConstants &&
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(Ty->isArrayType() || Ty->isRecordType()) &&
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CGF.CGM.isTypeConstant(Ty, true))
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if (llvm::Constant *Init = CGF.CGM.EmitConstantExpr(Inner, Ty, &CGF)) {
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auto *GV = new llvm::GlobalVariable(
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CGF.CGM.getModule(), Init->getType(), /*isConstant=*/true,
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llvm::GlobalValue::PrivateLinkage, Init, ".ref.tmp");
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CharUnits alignment = CGF.getContext().getTypeAlignInChars(Ty);
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GV->setAlignment(alignment.getQuantity());
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// FIXME: Should we put the new global into a COMDAT?
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return Address(GV, alignment);
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}
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return CGF.CreateMemTemp(Ty, "ref.tmp");
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}
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case SD_Thread:
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case SD_Static:
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return CGF.CGM.GetAddrOfGlobalTemporary(M, Inner);
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case SD_Dynamic:
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llvm_unreachable("temporary can't have dynamic storage duration");
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}
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llvm_unreachable("unknown storage duration");
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}
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LValue CodeGenFunction::
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EmitMaterializeTemporaryExpr(const MaterializeTemporaryExpr *M) {
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const Expr *E = M->GetTemporaryExpr();
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// FIXME: ideally this would use EmitAnyExprToMem, however, we cannot do so
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// as that will cause the lifetime adjustment to be lost for ARC
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auto ownership = M->getType().getObjCLifetime();
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if (ownership != Qualifiers::OCL_None &&
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ownership != Qualifiers::OCL_ExplicitNone) {
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Address Object = createReferenceTemporary(*this, M, E);
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if (auto *Var = dyn_cast<llvm::GlobalVariable>(Object.getPointer())) {
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Object = Address(llvm::ConstantExpr::getBitCast(Var,
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ConvertTypeForMem(E->getType())
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->getPointerTo(Object.getAddressSpace())),
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Object.getAlignment());
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// createReferenceTemporary will promote the temporary to a global with a
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// constant initializer if it can. It can only do this to a value of
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// ARC-manageable type if the value is global and therefore "immune" to
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// ref-counting operations. Therefore we have no need to emit either a
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// dynamic initialization or a cleanup and we can just return the address
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// of the temporary.
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if (Var->hasInitializer())
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return MakeAddrLValue(Object, M->getType(), AlignmentSource::Decl);
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Var->setInitializer(CGM.EmitNullConstant(E->getType()));
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}
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LValue RefTempDst = MakeAddrLValue(Object, M->getType(),
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AlignmentSource::Decl);
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switch (getEvaluationKind(E->getType())) {
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default: llvm_unreachable("expected scalar or aggregate expression");
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case TEK_Scalar:
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EmitScalarInit(E, M->getExtendingDecl(), RefTempDst, false);
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break;
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case TEK_Aggregate: {
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EmitAggExpr(E, AggValueSlot::forAddr(Object,
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E->getType().getQualifiers(),
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AggValueSlot::IsDestructed,
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AggValueSlot::DoesNotNeedGCBarriers,
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AggValueSlot::IsNotAliased));
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break;
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}
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}
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pushTemporaryCleanup(*this, M, E, Object);
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return RefTempDst;
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}
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SmallVector<const Expr *, 2> CommaLHSs;
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SmallVector<SubobjectAdjustment, 2> Adjustments;
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E = E->skipRValueSubobjectAdjustments(CommaLHSs, Adjustments);
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for (const auto &Ignored : CommaLHSs)
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EmitIgnoredExpr(Ignored);
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if (const auto *opaque = dyn_cast<OpaqueValueExpr>(E)) {
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if (opaque->getType()->isRecordType()) {
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assert(Adjustments.empty());
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return EmitOpaqueValueLValue(opaque);
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}
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}
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// Create and initialize the reference temporary.
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Address Object = createReferenceTemporary(*this, M, E);
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if (auto *Var = dyn_cast<llvm::GlobalVariable>(Object.getPointer())) {
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Object = Address(llvm::ConstantExpr::getBitCast(
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Var, ConvertTypeForMem(E->getType())->getPointerTo()),
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Object.getAlignment());
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// If the temporary is a global and has a constant initializer or is a
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// constant temporary that we promoted to a global, we may have already
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// initialized it.
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if (!Var->hasInitializer()) {
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Var->setInitializer(CGM.EmitNullConstant(E->getType()));
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EmitAnyExprToMem(E, Object, Qualifiers(), /*IsInit*/true);
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}
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} else {
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switch (M->getStorageDuration()) {
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case SD_Automatic:
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case SD_FullExpression:
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if (auto *Size = EmitLifetimeStart(
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CGM.getDataLayout().getTypeAllocSize(Object.getElementType()),
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Object.getPointer())) {
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if (M->getStorageDuration() == SD_Automatic)
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pushCleanupAfterFullExpr<CallLifetimeEnd>(NormalEHLifetimeMarker,
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Object, Size);
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else
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pushFullExprCleanup<CallLifetimeEnd>(NormalEHLifetimeMarker, Object,
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Size);
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}
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break;
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default:
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break;
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}
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EmitAnyExprToMem(E, Object, Qualifiers(), /*IsInit*/true);
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}
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pushTemporaryCleanup(*this, M, E, Object);
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// Perform derived-to-base casts and/or field accesses, to get from the
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// temporary object we created (and, potentially, for which we extended
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// the lifetime) to the subobject we're binding the reference to.
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for (unsigned I = Adjustments.size(); I != 0; --I) {
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SubobjectAdjustment &Adjustment = Adjustments[I-1];
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switch (Adjustment.Kind) {
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case SubobjectAdjustment::DerivedToBaseAdjustment:
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Object =
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GetAddressOfBaseClass(Object, Adjustment.DerivedToBase.DerivedClass,
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Adjustment.DerivedToBase.BasePath->path_begin(),
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Adjustment.DerivedToBase.BasePath->path_end(),
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/*NullCheckValue=*/ false, E->getExprLoc());
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break;
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case SubobjectAdjustment::FieldAdjustment: {
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LValue LV = MakeAddrLValue(Object, E->getType(),
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AlignmentSource::Decl);
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LV = EmitLValueForField(LV, Adjustment.Field);
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assert(LV.isSimple() &&
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"materialized temporary field is not a simple lvalue");
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Object = LV.getAddress();
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break;
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}
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case SubobjectAdjustment::MemberPointerAdjustment: {
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llvm::Value *Ptr = EmitScalarExpr(Adjustment.Ptr.RHS);
|
|
Object = EmitCXXMemberDataPointerAddress(E, Object, Ptr,
|
|
Adjustment.Ptr.MPT);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
return MakeAddrLValue(Object, M->getType(), AlignmentSource::Decl);
|
|
}
|
|
|
|
RValue
|
|
CodeGenFunction::EmitReferenceBindingToExpr(const Expr *E) {
|
|
// Emit the expression as an lvalue.
|
|
LValue LV = EmitLValue(E);
|
|
assert(LV.isSimple());
|
|
llvm::Value *Value = LV.getPointer();
|
|
|
|
if (sanitizePerformTypeCheck() && !E->getType()->isFunctionType()) {
|
|
// C++11 [dcl.ref]p5 (as amended by core issue 453):
|
|
// If a glvalue to which a reference is directly bound designates neither
|
|
// an existing object or function of an appropriate type nor a region of
|
|
// storage of suitable size and alignment to contain an object of the
|
|
// reference's type, the behavior is undefined.
|
|
QualType Ty = E->getType();
|
|
EmitTypeCheck(TCK_ReferenceBinding, E->getExprLoc(), Value, Ty);
|
|
}
|
|
|
|
return RValue::get(Value);
|
|
}
|
|
|
|
|
|
/// getAccessedFieldNo - Given an encoded value and a result number, return the
|
|
/// input field number being accessed.
|
|
unsigned CodeGenFunction::getAccessedFieldNo(unsigned Idx,
|
|
const llvm::Constant *Elts) {
|
|
return cast<llvm::ConstantInt>(Elts->getAggregateElement(Idx))
|
|
->getZExtValue();
|
|
}
|
|
|
|
/// Emit the hash_16_bytes function from include/llvm/ADT/Hashing.h.
|
|
static llvm::Value *emitHash16Bytes(CGBuilderTy &Builder, llvm::Value *Low,
|
|
llvm::Value *High) {
|
|
llvm::Value *KMul = Builder.getInt64(0x9ddfea08eb382d69ULL);
|
|
llvm::Value *K47 = Builder.getInt64(47);
|
|
llvm::Value *A0 = Builder.CreateMul(Builder.CreateXor(Low, High), KMul);
|
|
llvm::Value *A1 = Builder.CreateXor(Builder.CreateLShr(A0, K47), A0);
|
|
llvm::Value *B0 = Builder.CreateMul(Builder.CreateXor(High, A1), KMul);
|
|
llvm::Value *B1 = Builder.CreateXor(Builder.CreateLShr(B0, K47), B0);
|
|
return Builder.CreateMul(B1, KMul);
|
|
}
|
|
|
|
bool CodeGenFunction::sanitizePerformTypeCheck() const {
|
|
return SanOpts.has(SanitizerKind::Null) |
|
|
SanOpts.has(SanitizerKind::Alignment) |
|
|
SanOpts.has(SanitizerKind::ObjectSize) |
|
|
SanOpts.has(SanitizerKind::Vptr);
|
|
}
|
|
|
|
void CodeGenFunction::EmitTypeCheck(TypeCheckKind TCK, SourceLocation Loc,
|
|
llvm::Value *Ptr, QualType Ty,
|
|
CharUnits Alignment, bool SkipNullCheck) {
|
|
if (!sanitizePerformTypeCheck())
|
|
return;
|
|
|
|
// Don't check pointers outside the default address space. The null check
|
|
// isn't correct, the object-size check isn't supported by LLVM, and we can't
|
|
// communicate the addresses to the runtime handler for the vptr check.
|
|
if (Ptr->getType()->getPointerAddressSpace())
|
|
return;
|
|
|
|
SanitizerScope SanScope(this);
|
|
|
|
SmallVector<std::pair<llvm::Value *, SanitizerMask>, 3> Checks;
|
|
llvm::BasicBlock *Done = nullptr;
|
|
|
|
bool AllowNullPointers = TCK == TCK_DowncastPointer || TCK == TCK_Upcast ||
|
|
TCK == TCK_UpcastToVirtualBase;
|
|
if ((SanOpts.has(SanitizerKind::Null) || AllowNullPointers) &&
|
|
!SkipNullCheck) {
|
|
// The glvalue must not be an empty glvalue.
|
|
llvm::Value *IsNonNull = Builder.CreateIsNotNull(Ptr);
|
|
|
|
if (AllowNullPointers) {
|
|
// When performing pointer casts, it's OK if the value is null.
|
|
// Skip the remaining checks in that case.
|
|
Done = createBasicBlock("null");
|
|
llvm::BasicBlock *Rest = createBasicBlock("not.null");
|
|
Builder.CreateCondBr(IsNonNull, Rest, Done);
|
|
EmitBlock(Rest);
|
|
} else {
|
|
Checks.push_back(std::make_pair(IsNonNull, SanitizerKind::Null));
|
|
}
|
|
}
|
|
|
|
if (SanOpts.has(SanitizerKind::ObjectSize) && !Ty->isIncompleteType()) {
|
|
uint64_t Size = getContext().getTypeSizeInChars(Ty).getQuantity();
|
|
|
|
// The glvalue must refer to a large enough storage region.
|
|
// FIXME: If Address Sanitizer is enabled, insert dynamic instrumentation
|
|
// to check this.
|
|
// FIXME: Get object address space
|
|
llvm::Type *Tys[2] = { IntPtrTy, Int8PtrTy };
|
|
llvm::Value *F = CGM.getIntrinsic(llvm::Intrinsic::objectsize, Tys);
|
|
llvm::Value *Min = Builder.getFalse();
|
|
llvm::Value *CastAddr = Builder.CreateBitCast(Ptr, Int8PtrTy);
|
|
llvm::Value *LargeEnough =
|
|
Builder.CreateICmpUGE(Builder.CreateCall(F, {CastAddr, Min}),
|
|
llvm::ConstantInt::get(IntPtrTy, Size));
|
|
Checks.push_back(std::make_pair(LargeEnough, SanitizerKind::ObjectSize));
|
|
}
|
|
|
|
uint64_t AlignVal = 0;
|
|
|
|
if (SanOpts.has(SanitizerKind::Alignment)) {
|
|
AlignVal = Alignment.getQuantity();
|
|
if (!Ty->isIncompleteType() && !AlignVal)
|
|
AlignVal = getContext().getTypeAlignInChars(Ty).getQuantity();
|
|
|
|
// The glvalue must be suitably aligned.
|
|
if (AlignVal) {
|
|
llvm::Value *Align =
|
|
Builder.CreateAnd(Builder.CreatePtrToInt(Ptr, IntPtrTy),
|
|
llvm::ConstantInt::get(IntPtrTy, AlignVal - 1));
|
|
llvm::Value *Aligned =
|
|
Builder.CreateICmpEQ(Align, llvm::ConstantInt::get(IntPtrTy, 0));
|
|
Checks.push_back(std::make_pair(Aligned, SanitizerKind::Alignment));
|
|
}
|
|
}
|
|
|
|
if (Checks.size() > 0) {
|
|
llvm::Constant *StaticData[] = {
|
|
EmitCheckSourceLocation(Loc),
|
|
EmitCheckTypeDescriptor(Ty),
|
|
llvm::ConstantInt::get(SizeTy, AlignVal),
|
|
llvm::ConstantInt::get(Int8Ty, TCK)
|
|
};
|
|
EmitCheck(Checks, "type_mismatch", StaticData, Ptr);
|
|
}
|
|
|
|
// If possible, check that the vptr indicates that there is a subobject of
|
|
// type Ty at offset zero within this object.
|
|
//
|
|
// C++11 [basic.life]p5,6:
|
|
// [For storage which does not refer to an object within its lifetime]
|
|
// The program has undefined behavior if:
|
|
// -- the [pointer or glvalue] is used to access a non-static data member
|
|
// or call a non-static member function
|
|
CXXRecordDecl *RD = Ty->getAsCXXRecordDecl();
|
|
if (SanOpts.has(SanitizerKind::Vptr) &&
|
|
(TCK == TCK_MemberAccess || TCK == TCK_MemberCall ||
|
|
TCK == TCK_DowncastPointer || TCK == TCK_DowncastReference ||
|
|
TCK == TCK_UpcastToVirtualBase) &&
|
|
RD && RD->hasDefinition() && RD->isDynamicClass()) {
|
|
// Compute a hash of the mangled name of the type.
|
|
//
|
|
// FIXME: This is not guaranteed to be deterministic! Move to a
|
|
// fingerprinting mechanism once LLVM provides one. For the time
|
|
// being the implementation happens to be deterministic.
|
|
SmallString<64> MangledName;
|
|
llvm::raw_svector_ostream Out(MangledName);
|
|
CGM.getCXXABI().getMangleContext().mangleCXXRTTI(Ty.getUnqualifiedType(),
|
|
Out);
|
|
|
|
// Blacklist based on the mangled type.
|
|
if (!CGM.getContext().getSanitizerBlacklist().isBlacklistedType(
|
|
Out.str())) {
|
|
llvm::hash_code TypeHash = hash_value(Out.str());
|
|
|
|
// Load the vptr, and compute hash_16_bytes(TypeHash, vptr).
|
|
llvm::Value *Low = llvm::ConstantInt::get(Int64Ty, TypeHash);
|
|
llvm::Type *VPtrTy = llvm::PointerType::get(IntPtrTy, 0);
|
|
Address VPtrAddr(Builder.CreateBitCast(Ptr, VPtrTy), getPointerAlign());
|
|
llvm::Value *VPtrVal = Builder.CreateLoad(VPtrAddr);
|
|
llvm::Value *High = Builder.CreateZExt(VPtrVal, Int64Ty);
|
|
|
|
llvm::Value *Hash = emitHash16Bytes(Builder, Low, High);
|
|
Hash = Builder.CreateTrunc(Hash, IntPtrTy);
|
|
|
|
// Look the hash up in our cache.
|
|
const int CacheSize = 128;
|
|
llvm::Type *HashTable = llvm::ArrayType::get(IntPtrTy, CacheSize);
|
|
llvm::Value *Cache = CGM.CreateRuntimeVariable(HashTable,
|
|
"__ubsan_vptr_type_cache");
|
|
llvm::Value *Slot = Builder.CreateAnd(Hash,
|
|
llvm::ConstantInt::get(IntPtrTy,
|
|
CacheSize-1));
|
|
llvm::Value *Indices[] = { Builder.getInt32(0), Slot };
|
|
llvm::Value *CacheVal =
|
|
Builder.CreateAlignedLoad(Builder.CreateInBoundsGEP(Cache, Indices),
|
|
getPointerAlign());
|
|
|
|
// If the hash isn't in the cache, call a runtime handler to perform the
|
|
// hard work of checking whether the vptr is for an object of the right
|
|
// type. This will either fill in the cache and return, or produce a
|
|
// diagnostic.
|
|
llvm::Value *EqualHash = Builder.CreateICmpEQ(CacheVal, Hash);
|
|
llvm::Constant *StaticData[] = {
|
|
EmitCheckSourceLocation(Loc),
|
|
EmitCheckTypeDescriptor(Ty),
|
|
CGM.GetAddrOfRTTIDescriptor(Ty.getUnqualifiedType()),
|
|
llvm::ConstantInt::get(Int8Ty, TCK)
|
|
};
|
|
llvm::Value *DynamicData[] = { Ptr, Hash };
|
|
EmitCheck(std::make_pair(EqualHash, SanitizerKind::Vptr),
|
|
"dynamic_type_cache_miss", StaticData, DynamicData);
|
|
}
|
|
}
|
|
|
|
if (Done) {
|
|
Builder.CreateBr(Done);
|
|
EmitBlock(Done);
|
|
}
|
|
}
|
|
|
|
/// Determine whether this expression refers to a flexible array member in a
|
|
/// struct. We disable array bounds checks for such members.
|
|
static bool isFlexibleArrayMemberExpr(const Expr *E) {
|
|
// For compatibility with existing code, we treat arrays of length 0 or
|
|
// 1 as flexible array members.
|
|
const ArrayType *AT = E->getType()->castAsArrayTypeUnsafe();
|
|
if (const auto *CAT = dyn_cast<ConstantArrayType>(AT)) {
|
|
if (CAT->getSize().ugt(1))
|
|
return false;
|
|
} else if (!isa<IncompleteArrayType>(AT))
|
|
return false;
|
|
|
|
E = E->IgnoreParens();
|
|
|
|
// A flexible array member must be the last member in the class.
|
|
if (const auto *ME = dyn_cast<MemberExpr>(E)) {
|
|
// FIXME: If the base type of the member expr is not FD->getParent(),
|
|
// this should not be treated as a flexible array member access.
|
|
if (const auto *FD = dyn_cast<FieldDecl>(ME->getMemberDecl())) {
|
|
RecordDecl::field_iterator FI(
|
|
DeclContext::decl_iterator(const_cast<FieldDecl *>(FD)));
|
|
return ++FI == FD->getParent()->field_end();
|
|
}
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
/// If Base is known to point to the start of an array, return the length of
|
|
/// that array. Return 0 if the length cannot be determined.
|
|
static llvm::Value *getArrayIndexingBound(
|
|
CodeGenFunction &CGF, const Expr *Base, QualType &IndexedType) {
|
|
// For the vector indexing extension, the bound is the number of elements.
|
|
if (const VectorType *VT = Base->getType()->getAs<VectorType>()) {
|
|
IndexedType = Base->getType();
|
|
return CGF.Builder.getInt32(VT->getNumElements());
|
|
}
|
|
|
|
Base = Base->IgnoreParens();
|
|
|
|
if (const auto *CE = dyn_cast<CastExpr>(Base)) {
|
|
if (CE->getCastKind() == CK_ArrayToPointerDecay &&
|
|
!isFlexibleArrayMemberExpr(CE->getSubExpr())) {
|
|
IndexedType = CE->getSubExpr()->getType();
|
|
const ArrayType *AT = IndexedType->castAsArrayTypeUnsafe();
|
|
if (const auto *CAT = dyn_cast<ConstantArrayType>(AT))
|
|
return CGF.Builder.getInt(CAT->getSize());
|
|
else if (const auto *VAT = dyn_cast<VariableArrayType>(AT))
|
|
return CGF.getVLASize(VAT).first;
|
|
}
|
|
}
|
|
|
|
return nullptr;
|
|
}
|
|
|
|
void CodeGenFunction::EmitBoundsCheck(const Expr *E, const Expr *Base,
|
|
llvm::Value *Index, QualType IndexType,
|
|
bool Accessed) {
|
|
assert(SanOpts.has(SanitizerKind::ArrayBounds) &&
|
|
"should not be called unless adding bounds checks");
|
|
SanitizerScope SanScope(this);
|
|
|
|
QualType IndexedType;
|
|
llvm::Value *Bound = getArrayIndexingBound(*this, Base, IndexedType);
|
|
if (!Bound)
|
|
return;
|
|
|
|
bool IndexSigned = IndexType->isSignedIntegerOrEnumerationType();
|
|
llvm::Value *IndexVal = Builder.CreateIntCast(Index, SizeTy, IndexSigned);
|
|
llvm::Value *BoundVal = Builder.CreateIntCast(Bound, SizeTy, false);
|
|
|
|
llvm::Constant *StaticData[] = {
|
|
EmitCheckSourceLocation(E->getExprLoc()),
|
|
EmitCheckTypeDescriptor(IndexedType),
|
|
EmitCheckTypeDescriptor(IndexType)
|
|
};
|
|
llvm::Value *Check = Accessed ? Builder.CreateICmpULT(IndexVal, BoundVal)
|
|
: Builder.CreateICmpULE(IndexVal, BoundVal);
|
|
EmitCheck(std::make_pair(Check, SanitizerKind::ArrayBounds), "out_of_bounds",
|
|
StaticData, Index);
|
|
}
|
|
|
|
|
|
CodeGenFunction::ComplexPairTy CodeGenFunction::
|
|
EmitComplexPrePostIncDec(const UnaryOperator *E, LValue LV,
|
|
bool isInc, bool isPre) {
|
|
ComplexPairTy InVal = EmitLoadOfComplex(LV, E->getExprLoc());
|
|
|
|
llvm::Value *NextVal;
|
|
if (isa<llvm::IntegerType>(InVal.first->getType())) {
|
|
uint64_t AmountVal = isInc ? 1 : -1;
|
|
NextVal = llvm::ConstantInt::get(InVal.first->getType(), AmountVal, true);
|
|
|
|
// Add the inc/dec to the real part.
|
|
NextVal = Builder.CreateAdd(InVal.first, NextVal, isInc ? "inc" : "dec");
|
|
} else {
|
|
QualType ElemTy = E->getType()->getAs<ComplexType>()->getElementType();
|
|
llvm::APFloat FVal(getContext().getFloatTypeSemantics(ElemTy), 1);
|
|
if (!isInc)
|
|
FVal.changeSign();
|
|
NextVal = llvm::ConstantFP::get(getLLVMContext(), FVal);
|
|
|
|
// Add the inc/dec to the real part.
|
|
NextVal = Builder.CreateFAdd(InVal.first, NextVal, isInc ? "inc" : "dec");
|
|
}
|
|
|
|
ComplexPairTy IncVal(NextVal, InVal.second);
|
|
|
|
// Store the updated result through the lvalue.
|
|
EmitStoreOfComplex(IncVal, LV, /*init*/ false);
|
|
|
|
// If this is a postinc, return the value read from memory, otherwise use the
|
|
// updated value.
|
|
return isPre ? IncVal : InVal;
|
|
}
|
|
|
|
void CodeGenModule::EmitExplicitCastExprType(const ExplicitCastExpr *E,
|
|
CodeGenFunction *CGF) {
|
|
// Bind VLAs in the cast type.
|
|
if (CGF && E->getType()->isVariablyModifiedType())
|
|
CGF->EmitVariablyModifiedType(E->getType());
|
|
|
|
if (CGDebugInfo *DI = getModuleDebugInfo())
|
|
DI->EmitExplicitCastType(E->getType());
|
|
}
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// LValue Expression Emission
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
/// EmitPointerWithAlignment - Given an expression of pointer type, try to
|
|
/// derive a more accurate bound on the alignment of the pointer.
|
|
Address CodeGenFunction::EmitPointerWithAlignment(const Expr *E,
|
|
AlignmentSource *Source) {
|
|
// We allow this with ObjC object pointers because of fragile ABIs.
|
|
assert(E->getType()->isPointerType() ||
|
|
E->getType()->isObjCObjectPointerType());
|
|
E = E->IgnoreParens();
|
|
|
|
// Casts:
|
|
if (const CastExpr *CE = dyn_cast<CastExpr>(E)) {
|
|
if (const auto *ECE = dyn_cast<ExplicitCastExpr>(CE))
|
|
CGM.EmitExplicitCastExprType(ECE, this);
|
|
|
|
switch (CE->getCastKind()) {
|
|
// Non-converting casts (but not C's implicit conversion from void*).
|
|
case CK_BitCast:
|
|
case CK_NoOp:
|
|
if (auto PtrTy = CE->getSubExpr()->getType()->getAs<PointerType>()) {
|
|
if (PtrTy->getPointeeType()->isVoidType())
|
|
break;
|
|
|
|
AlignmentSource InnerSource;
|
|
Address Addr = EmitPointerWithAlignment(CE->getSubExpr(), &InnerSource);
|
|
if (Source) *Source = InnerSource;
|
|
|
|
// If this is an explicit bitcast, and the source l-value is
|
|
// opaque, honor the alignment of the casted-to type.
|
|
if (isa<ExplicitCastExpr>(CE) &&
|
|
InnerSource != AlignmentSource::Decl) {
|
|
Addr = Address(Addr.getPointer(),
|
|
getNaturalPointeeTypeAlignment(E->getType(), Source));
|
|
}
|
|
|
|
if (SanOpts.has(SanitizerKind::CFIUnrelatedCast) &&
|
|
CE->getCastKind() == CK_BitCast) {
|
|
if (auto PT = E->getType()->getAs<PointerType>())
|
|
EmitVTablePtrCheckForCast(PT->getPointeeType(), Addr.getPointer(),
|
|
/*MayBeNull=*/true,
|
|
CodeGenFunction::CFITCK_UnrelatedCast,
|
|
CE->getLocStart());
|
|
}
|
|
|
|
return Builder.CreateBitCast(Addr, ConvertType(E->getType()));
|
|
}
|
|
break;
|
|
|
|
// Array-to-pointer decay.
|
|
case CK_ArrayToPointerDecay:
|
|
return EmitArrayToPointerDecay(CE->getSubExpr(), Source);
|
|
|
|
// Derived-to-base conversions.
|
|
case CK_UncheckedDerivedToBase:
|
|
case CK_DerivedToBase: {
|
|
Address Addr = EmitPointerWithAlignment(CE->getSubExpr(), Source);
|
|
auto Derived = CE->getSubExpr()->getType()->getPointeeCXXRecordDecl();
|
|
return GetAddressOfBaseClass(Addr, Derived,
|
|
CE->path_begin(), CE->path_end(),
|
|
ShouldNullCheckClassCastValue(CE),
|
|
CE->getExprLoc());
|
|
}
|
|
|
|
// TODO: Is there any reason to treat base-to-derived conversions
|
|
// specially?
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
// Unary &.
|
|
if (const UnaryOperator *UO = dyn_cast<UnaryOperator>(E)) {
|
|
if (UO->getOpcode() == UO_AddrOf) {
|
|
LValue LV = EmitLValue(UO->getSubExpr());
|
|
if (Source) *Source = LV.getAlignmentSource();
|
|
return LV.getAddress();
|
|
}
|
|
}
|
|
|
|
// TODO: conditional operators, comma.
|
|
|
|
// Otherwise, use the alignment of the type.
|
|
CharUnits Align = getNaturalPointeeTypeAlignment(E->getType(), Source);
|
|
return Address(EmitScalarExpr(E), Align);
|
|
}
|
|
|
|
RValue CodeGenFunction::GetUndefRValue(QualType Ty) {
|
|
if (Ty->isVoidType())
|
|
return RValue::get(nullptr);
|
|
|
|
switch (getEvaluationKind(Ty)) {
|
|
case TEK_Complex: {
|
|
llvm::Type *EltTy =
|
|
ConvertType(Ty->castAs<ComplexType>()->getElementType());
|
|
llvm::Value *U = llvm::UndefValue::get(EltTy);
|
|
return RValue::getComplex(std::make_pair(U, U));
|
|
}
|
|
|
|
// If this is a use of an undefined aggregate type, the aggregate must have an
|
|
// identifiable address. Just because the contents of the value are undefined
|
|
// doesn't mean that the address can't be taken and compared.
|
|
case TEK_Aggregate: {
|
|
Address DestPtr = CreateMemTemp(Ty, "undef.agg.tmp");
|
|
return RValue::getAggregate(DestPtr);
|
|
}
|
|
|
|
case TEK_Scalar:
|
|
return RValue::get(llvm::UndefValue::get(ConvertType(Ty)));
|
|
}
|
|
llvm_unreachable("bad evaluation kind");
|
|
}
|
|
|
|
RValue CodeGenFunction::EmitUnsupportedRValue(const Expr *E,
|
|
const char *Name) {
|
|
ErrorUnsupported(E, Name);
|
|
return GetUndefRValue(E->getType());
|
|
}
|
|
|
|
LValue CodeGenFunction::EmitUnsupportedLValue(const Expr *E,
|
|
const char *Name) {
|
|
ErrorUnsupported(E, Name);
|
|
llvm::Type *Ty = llvm::PointerType::getUnqual(ConvertType(E->getType()));
|
|
return MakeAddrLValue(Address(llvm::UndefValue::get(Ty), CharUnits::One()),
|
|
E->getType());
|
|
}
|
|
|
|
LValue CodeGenFunction::EmitCheckedLValue(const Expr *E, TypeCheckKind TCK) {
|
|
LValue LV;
|
|
if (SanOpts.has(SanitizerKind::ArrayBounds) && isa<ArraySubscriptExpr>(E))
|
|
LV = EmitArraySubscriptExpr(cast<ArraySubscriptExpr>(E), /*Accessed*/true);
|
|
else
|
|
LV = EmitLValue(E);
|
|
if (!isa<DeclRefExpr>(E) && !LV.isBitField() && LV.isSimple())
|
|
EmitTypeCheck(TCK, E->getExprLoc(), LV.getPointer(),
|
|
E->getType(), LV.getAlignment());
|
|
return LV;
|
|
}
|
|
|
|
/// EmitLValue - Emit code to compute a designator that specifies the location
|
|
/// of the expression.
|
|
///
|
|
/// This can return one of two things: a simple address or a bitfield reference.
|
|
/// In either case, the LLVM Value* in the LValue structure is guaranteed to be
|
|
/// an LLVM pointer type.
|
|
///
|
|
/// If this returns a bitfield reference, nothing about the pointee type of the
|
|
/// LLVM value is known: For example, it may not be a pointer to an integer.
|
|
///
|
|
/// If this returns a normal address, and if the lvalue's C type is fixed size,
|
|
/// this method guarantees that the returned pointer type will point to an LLVM
|
|
/// type of the same size of the lvalue's type. If the lvalue has a variable
|
|
/// length type, this is not possible.
|
|
///
|
|
LValue CodeGenFunction::EmitLValue(const Expr *E) {
|
|
ApplyDebugLocation DL(*this, E);
|
|
switch (E->getStmtClass()) {
|
|
default: return EmitUnsupportedLValue(E, "l-value expression");
|
|
|
|
case Expr::ObjCPropertyRefExprClass:
|
|
llvm_unreachable("cannot emit a property reference directly");
|
|
|
|
case Expr::ObjCSelectorExprClass:
|
|
return EmitObjCSelectorLValue(cast<ObjCSelectorExpr>(E));
|
|
case Expr::ObjCIsaExprClass:
|
|
return EmitObjCIsaExpr(cast<ObjCIsaExpr>(E));
|
|
case Expr::BinaryOperatorClass:
|
|
return EmitBinaryOperatorLValue(cast<BinaryOperator>(E));
|
|
case Expr::CompoundAssignOperatorClass: {
|
|
QualType Ty = E->getType();
|
|
if (const AtomicType *AT = Ty->getAs<AtomicType>())
|
|
Ty = AT->getValueType();
|
|
if (!Ty->isAnyComplexType())
|
|
return EmitCompoundAssignmentLValue(cast<CompoundAssignOperator>(E));
|
|
return EmitComplexCompoundAssignmentLValue(cast<CompoundAssignOperator>(E));
|
|
}
|
|
case Expr::CallExprClass:
|
|
case Expr::CXXMemberCallExprClass:
|
|
case Expr::CXXOperatorCallExprClass:
|
|
case Expr::UserDefinedLiteralClass:
|
|
return EmitCallExprLValue(cast<CallExpr>(E));
|
|
case Expr::VAArgExprClass:
|
|
return EmitVAArgExprLValue(cast<VAArgExpr>(E));
|
|
case Expr::DeclRefExprClass:
|
|
return EmitDeclRefLValue(cast<DeclRefExpr>(E));
|
|
case Expr::ParenExprClass:
|
|
return EmitLValue(cast<ParenExpr>(E)->getSubExpr());
|
|
case Expr::GenericSelectionExprClass:
|
|
return EmitLValue(cast<GenericSelectionExpr>(E)->getResultExpr());
|
|
case Expr::PredefinedExprClass:
|
|
return EmitPredefinedLValue(cast<PredefinedExpr>(E));
|
|
case Expr::StringLiteralClass:
|
|
return EmitStringLiteralLValue(cast<StringLiteral>(E));
|
|
case Expr::ObjCEncodeExprClass:
|
|
return EmitObjCEncodeExprLValue(cast<ObjCEncodeExpr>(E));
|
|
case Expr::PseudoObjectExprClass:
|
|
return EmitPseudoObjectLValue(cast<PseudoObjectExpr>(E));
|
|
case Expr::InitListExprClass:
|
|
return EmitInitListLValue(cast<InitListExpr>(E));
|
|
case Expr::CXXTemporaryObjectExprClass:
|
|
case Expr::CXXConstructExprClass:
|
|
return EmitCXXConstructLValue(cast<CXXConstructExpr>(E));
|
|
case Expr::CXXBindTemporaryExprClass:
|
|
return EmitCXXBindTemporaryLValue(cast<CXXBindTemporaryExpr>(E));
|
|
case Expr::CXXUuidofExprClass:
|
|
return EmitCXXUuidofLValue(cast<CXXUuidofExpr>(E));
|
|
case Expr::LambdaExprClass:
|
|
return EmitLambdaLValue(cast<LambdaExpr>(E));
|
|
|
|
case Expr::ExprWithCleanupsClass: {
|
|
const auto *cleanups = cast<ExprWithCleanups>(E);
|
|
enterFullExpression(cleanups);
|
|
RunCleanupsScope Scope(*this);
|
|
return EmitLValue(cleanups->getSubExpr());
|
|
}
|
|
|
|
case Expr::CXXDefaultArgExprClass:
|
|
return EmitLValue(cast<CXXDefaultArgExpr>(E)->getExpr());
|
|
case Expr::CXXDefaultInitExprClass: {
|
|
CXXDefaultInitExprScope Scope(*this);
|
|
return EmitLValue(cast<CXXDefaultInitExpr>(E)->getExpr());
|
|
}
|
|
case Expr::CXXTypeidExprClass:
|
|
return EmitCXXTypeidLValue(cast<CXXTypeidExpr>(E));
|
|
|
|
case Expr::ObjCMessageExprClass:
|
|
return EmitObjCMessageExprLValue(cast<ObjCMessageExpr>(E));
|
|
case Expr::ObjCIvarRefExprClass:
|
|
return EmitObjCIvarRefLValue(cast<ObjCIvarRefExpr>(E));
|
|
case Expr::StmtExprClass:
|
|
return EmitStmtExprLValue(cast<StmtExpr>(E));
|
|
case Expr::UnaryOperatorClass:
|
|
return EmitUnaryOpLValue(cast<UnaryOperator>(E));
|
|
case Expr::ArraySubscriptExprClass:
|
|
return EmitArraySubscriptExpr(cast<ArraySubscriptExpr>(E));
|
|
case Expr::OMPArraySectionExprClass:
|
|
return EmitOMPArraySectionExpr(cast<OMPArraySectionExpr>(E));
|
|
case Expr::ExtVectorElementExprClass:
|
|
return EmitExtVectorElementExpr(cast<ExtVectorElementExpr>(E));
|
|
case Expr::MemberExprClass:
|
|
return EmitMemberExpr(cast<MemberExpr>(E));
|
|
case Expr::CompoundLiteralExprClass:
|
|
return EmitCompoundLiteralLValue(cast<CompoundLiteralExpr>(E));
|
|
case Expr::ConditionalOperatorClass:
|
|
return EmitConditionalOperatorLValue(cast<ConditionalOperator>(E));
|
|
case Expr::BinaryConditionalOperatorClass:
|
|
return EmitConditionalOperatorLValue(cast<BinaryConditionalOperator>(E));
|
|
case Expr::ChooseExprClass:
|
|
return EmitLValue(cast<ChooseExpr>(E)->getChosenSubExpr());
|
|
case Expr::OpaqueValueExprClass:
|
|
return EmitOpaqueValueLValue(cast<OpaqueValueExpr>(E));
|
|
case Expr::SubstNonTypeTemplateParmExprClass:
|
|
return EmitLValue(cast<SubstNonTypeTemplateParmExpr>(E)->getReplacement());
|
|
case Expr::ImplicitCastExprClass:
|
|
case Expr::CStyleCastExprClass:
|
|
case Expr::CXXFunctionalCastExprClass:
|
|
case Expr::CXXStaticCastExprClass:
|
|
case Expr::CXXDynamicCastExprClass:
|
|
case Expr::CXXReinterpretCastExprClass:
|
|
case Expr::CXXConstCastExprClass:
|
|
case Expr::ObjCBridgedCastExprClass:
|
|
return EmitCastLValue(cast<CastExpr>(E));
|
|
|
|
case Expr::MaterializeTemporaryExprClass:
|
|
return EmitMaterializeTemporaryExpr(cast<MaterializeTemporaryExpr>(E));
|
|
}
|
|
}
|
|
|
|
/// Given an object of the given canonical type, can we safely copy a
|
|
/// value out of it based on its initializer?
|
|
static bool isConstantEmittableObjectType(QualType type) {
|
|
assert(type.isCanonical());
|
|
assert(!type->isReferenceType());
|
|
|
|
// Must be const-qualified but non-volatile.
|
|
Qualifiers qs = type.getLocalQualifiers();
|
|
if (!qs.hasConst() || qs.hasVolatile()) return false;
|
|
|
|
// Otherwise, all object types satisfy this except C++ classes with
|
|
// mutable subobjects or non-trivial copy/destroy behavior.
|
|
if (const auto *RT = dyn_cast<RecordType>(type))
|
|
if (const auto *RD = dyn_cast<CXXRecordDecl>(RT->getDecl()))
|
|
if (RD->hasMutableFields() || !RD->isTrivial())
|
|
return false;
|
|
|
|
return true;
|
|
}
|
|
|
|
/// Can we constant-emit a load of a reference to a variable of the
|
|
/// given type? This is different from predicates like
|
|
/// Decl::isUsableInConstantExpressions because we do want it to apply
|
|
/// in situations that don't necessarily satisfy the language's rules
|
|
/// for this (e.g. C++'s ODR-use rules). For example, we want to able
|
|
/// to do this with const float variables even if those variables
|
|
/// aren't marked 'constexpr'.
|
|
enum ConstantEmissionKind {
|
|
CEK_None,
|
|
CEK_AsReferenceOnly,
|
|
CEK_AsValueOrReference,
|
|
CEK_AsValueOnly
|
|
};
|
|
static ConstantEmissionKind checkVarTypeForConstantEmission(QualType type) {
|
|
type = type.getCanonicalType();
|
|
if (const auto *ref = dyn_cast<ReferenceType>(type)) {
|
|
if (isConstantEmittableObjectType(ref->getPointeeType()))
|
|
return CEK_AsValueOrReference;
|
|
return CEK_AsReferenceOnly;
|
|
}
|
|
if (isConstantEmittableObjectType(type))
|
|
return CEK_AsValueOnly;
|
|
return CEK_None;
|
|
}
|
|
|
|
/// Try to emit a reference to the given value without producing it as
|
|
/// an l-value. This is actually more than an optimization: we can't
|
|
/// produce an l-value for variables that we never actually captured
|
|
/// in a block or lambda, which means const int variables or constexpr
|
|
/// literals or similar.
|
|
CodeGenFunction::ConstantEmission
|
|
CodeGenFunction::tryEmitAsConstant(DeclRefExpr *refExpr) {
|
|
ValueDecl *value = refExpr->getDecl();
|
|
|
|
// The value needs to be an enum constant or a constant variable.
|
|
ConstantEmissionKind CEK;
|
|
if (isa<ParmVarDecl>(value)) {
|
|
CEK = CEK_None;
|
|
} else if (auto *var = dyn_cast<VarDecl>(value)) {
|
|
CEK = checkVarTypeForConstantEmission(var->getType());
|
|
} else if (isa<EnumConstantDecl>(value)) {
|
|
CEK = CEK_AsValueOnly;
|
|
} else {
|
|
CEK = CEK_None;
|
|
}
|
|
if (CEK == CEK_None) return ConstantEmission();
|
|
|
|
Expr::EvalResult result;
|
|
bool resultIsReference;
|
|
QualType resultType;
|
|
|
|
// It's best to evaluate all the way as an r-value if that's permitted.
|
|
if (CEK != CEK_AsReferenceOnly &&
|
|
refExpr->EvaluateAsRValue(result, getContext())) {
|
|
resultIsReference = false;
|
|
resultType = refExpr->getType();
|
|
|
|
// Otherwise, try to evaluate as an l-value.
|
|
} else if (CEK != CEK_AsValueOnly &&
|
|
refExpr->EvaluateAsLValue(result, getContext())) {
|
|
resultIsReference = true;
|
|
resultType = value->getType();
|
|
|
|
// Failure.
|
|
} else {
|
|
return ConstantEmission();
|
|
}
|
|
|
|
// In any case, if the initializer has side-effects, abandon ship.
|
|
if (result.HasSideEffects)
|
|
return ConstantEmission();
|
|
|
|
// Emit as a constant.
|
|
llvm::Constant *C = CGM.EmitConstantValue(result.Val, resultType, this);
|
|
|
|
// Make sure we emit a debug reference to the global variable.
|
|
// This should probably fire even for
|
|
if (isa<VarDecl>(value)) {
|
|
if (!getContext().DeclMustBeEmitted(cast<VarDecl>(value)))
|
|
EmitDeclRefExprDbgValue(refExpr, C);
|
|
} else {
|
|
assert(isa<EnumConstantDecl>(value));
|
|
EmitDeclRefExprDbgValue(refExpr, C);
|
|
}
|
|
|
|
// If we emitted a reference constant, we need to dereference that.
|
|
if (resultIsReference)
|
|
return ConstantEmission::forReference(C);
|
|
|
|
return ConstantEmission::forValue(C);
|
|
}
|
|
|
|
llvm::Value *CodeGenFunction::EmitLoadOfScalar(LValue lvalue,
|
|
SourceLocation Loc) {
|
|
return EmitLoadOfScalar(lvalue.getAddress(), lvalue.isVolatile(),
|
|
lvalue.getType(), Loc, lvalue.getAlignmentSource(),
|
|
lvalue.getTBAAInfo(),
|
|
lvalue.getTBAABaseType(), lvalue.getTBAAOffset(),
|
|
lvalue.isNontemporal());
|
|
}
|
|
|
|
static bool hasBooleanRepresentation(QualType Ty) {
|
|
if (Ty->isBooleanType())
|
|
return true;
|
|
|
|
if (const EnumType *ET = Ty->getAs<EnumType>())
|
|
return ET->getDecl()->getIntegerType()->isBooleanType();
|
|
|
|
if (const AtomicType *AT = Ty->getAs<AtomicType>())
|
|
return hasBooleanRepresentation(AT->getValueType());
|
|
|
|
return false;
|
|
}
|
|
|
|
static bool getRangeForType(CodeGenFunction &CGF, QualType Ty,
|
|
llvm::APInt &Min, llvm::APInt &End,
|
|
bool StrictEnums) {
|
|
const EnumType *ET = Ty->getAs<EnumType>();
|
|
bool IsRegularCPlusPlusEnum = CGF.getLangOpts().CPlusPlus && StrictEnums &&
|
|
ET && !ET->getDecl()->isFixed();
|
|
bool IsBool = hasBooleanRepresentation(Ty);
|
|
if (!IsBool && !IsRegularCPlusPlusEnum)
|
|
return false;
|
|
|
|
if (IsBool) {
|
|
Min = llvm::APInt(CGF.getContext().getTypeSize(Ty), 0);
|
|
End = llvm::APInt(CGF.getContext().getTypeSize(Ty), 2);
|
|
} else {
|
|
const EnumDecl *ED = ET->getDecl();
|
|
llvm::Type *LTy = CGF.ConvertTypeForMem(ED->getIntegerType());
|
|
unsigned Bitwidth = LTy->getScalarSizeInBits();
|
|
unsigned NumNegativeBits = ED->getNumNegativeBits();
|
|
unsigned NumPositiveBits = ED->getNumPositiveBits();
|
|
|
|
if (NumNegativeBits) {
|
|
unsigned NumBits = std::max(NumNegativeBits, NumPositiveBits + 1);
|
|
assert(NumBits <= Bitwidth);
|
|
End = llvm::APInt(Bitwidth, 1) << (NumBits - 1);
|
|
Min = -End;
|
|
} else {
|
|
assert(NumPositiveBits <= Bitwidth);
|
|
End = llvm::APInt(Bitwidth, 1) << NumPositiveBits;
|
|
Min = llvm::APInt(Bitwidth, 0);
|
|
}
|
|
}
|
|
return true;
|
|
}
|
|
|
|
llvm::MDNode *CodeGenFunction::getRangeForLoadFromType(QualType Ty) {
|
|
llvm::APInt Min, End;
|
|
if (!getRangeForType(*this, Ty, Min, End,
|
|
CGM.getCodeGenOpts().StrictEnums))
|
|
return nullptr;
|
|
|
|
llvm::MDBuilder MDHelper(getLLVMContext());
|
|
return MDHelper.createRange(Min, End);
|
|
}
|
|
|
|
llvm::Value *CodeGenFunction::EmitLoadOfScalar(Address Addr, bool Volatile,
|
|
QualType Ty,
|
|
SourceLocation Loc,
|
|
AlignmentSource AlignSource,
|
|
llvm::MDNode *TBAAInfo,
|
|
QualType TBAABaseType,
|
|
uint64_t TBAAOffset,
|
|
bool isNontemporal) {
|
|
// For better performance, handle vector loads differently.
|
|
if (Ty->isVectorType()) {
|
|
const llvm::Type *EltTy = Addr.getElementType();
|
|
|
|
const auto *VTy = cast<llvm::VectorType>(EltTy);
|
|
|
|
// Handle vectors of size 3 like size 4 for better performance.
|
|
if (VTy->getNumElements() == 3) {
|
|
|
|
// Bitcast to vec4 type.
|
|
llvm::VectorType *vec4Ty = llvm::VectorType::get(VTy->getElementType(),
|
|
4);
|
|
Address Cast = Builder.CreateElementBitCast(Addr, vec4Ty, "castToVec4");
|
|
// Now load value.
|
|
llvm::Value *V = Builder.CreateLoad(Cast, Volatile, "loadVec4");
|
|
|
|
// Shuffle vector to get vec3.
|
|
V = Builder.CreateShuffleVector(V, llvm::UndefValue::get(vec4Ty),
|
|
{0, 1, 2}, "extractVec");
|
|
return EmitFromMemory(V, Ty);
|
|
}
|
|
}
|
|
|
|
// Atomic operations have to be done on integral types.
|
|
LValue AtomicLValue =
|
|
LValue::MakeAddr(Addr, Ty, getContext(), AlignSource, TBAAInfo);
|
|
if (Ty->isAtomicType() || LValueIsSuitableForInlineAtomic(AtomicLValue)) {
|
|
return EmitAtomicLoad(AtomicLValue, Loc).getScalarVal();
|
|
}
|
|
|
|
llvm::LoadInst *Load = Builder.CreateLoad(Addr, Volatile);
|
|
if (isNontemporal) {
|
|
llvm::MDNode *Node = llvm::MDNode::get(
|
|
Load->getContext(), llvm::ConstantAsMetadata::get(Builder.getInt32(1)));
|
|
Load->setMetadata(CGM.getModule().getMDKindID("nontemporal"), Node);
|
|
}
|
|
if (TBAAInfo) {
|
|
llvm::MDNode *TBAAPath = CGM.getTBAAStructTagInfo(TBAABaseType, TBAAInfo,
|
|
TBAAOffset);
|
|
if (TBAAPath)
|
|
CGM.DecorateInstructionWithTBAA(Load, TBAAPath,
|
|
false /*ConvertTypeToTag*/);
|
|
}
|
|
|
|
bool NeedsBoolCheck =
|
|
SanOpts.has(SanitizerKind::Bool) && hasBooleanRepresentation(Ty);
|
|
bool NeedsEnumCheck =
|
|
SanOpts.has(SanitizerKind::Enum) && Ty->getAs<EnumType>();
|
|
if (NeedsBoolCheck || NeedsEnumCheck) {
|
|
SanitizerScope SanScope(this);
|
|
llvm::APInt Min, End;
|
|
if (getRangeForType(*this, Ty, Min, End, true)) {
|
|
--End;
|
|
llvm::Value *Check;
|
|
if (!Min)
|
|
Check = Builder.CreateICmpULE(
|
|
Load, llvm::ConstantInt::get(getLLVMContext(), End));
|
|
else {
|
|
llvm::Value *Upper = Builder.CreateICmpSLE(
|
|
Load, llvm::ConstantInt::get(getLLVMContext(), End));
|
|
llvm::Value *Lower = Builder.CreateICmpSGE(
|
|
Load, llvm::ConstantInt::get(getLLVMContext(), Min));
|
|
Check = Builder.CreateAnd(Upper, Lower);
|
|
}
|
|
llvm::Constant *StaticArgs[] = {
|
|
EmitCheckSourceLocation(Loc),
|
|
EmitCheckTypeDescriptor(Ty)
|
|
};
|
|
SanitizerMask Kind = NeedsEnumCheck ? SanitizerKind::Enum : SanitizerKind::Bool;
|
|
EmitCheck(std::make_pair(Check, Kind), "load_invalid_value", StaticArgs,
|
|
EmitCheckValue(Load));
|
|
}
|
|
} else if (CGM.getCodeGenOpts().OptimizationLevel > 0)
|
|
if (llvm::MDNode *RangeInfo = getRangeForLoadFromType(Ty))
|
|
Load->setMetadata(llvm::LLVMContext::MD_range, RangeInfo);
|
|
|
|
return EmitFromMemory(Load, Ty);
|
|
}
|
|
|
|
llvm::Value *CodeGenFunction::EmitToMemory(llvm::Value *Value, QualType Ty) {
|
|
// Bool has a different representation in memory than in registers.
|
|
if (hasBooleanRepresentation(Ty)) {
|
|
// This should really always be an i1, but sometimes it's already
|
|
// an i8, and it's awkward to track those cases down.
|
|
if (Value->getType()->isIntegerTy(1))
|
|
return Builder.CreateZExt(Value, ConvertTypeForMem(Ty), "frombool");
|
|
assert(Value->getType()->isIntegerTy(getContext().getTypeSize(Ty)) &&
|
|
"wrong value rep of bool");
|
|
}
|
|
|
|
return Value;
|
|
}
|
|
|
|
llvm::Value *CodeGenFunction::EmitFromMemory(llvm::Value *Value, QualType Ty) {
|
|
// Bool has a different representation in memory than in registers.
|
|
if (hasBooleanRepresentation(Ty)) {
|
|
assert(Value->getType()->isIntegerTy(getContext().getTypeSize(Ty)) &&
|
|
"wrong value rep of bool");
|
|
return Builder.CreateTrunc(Value, Builder.getInt1Ty(), "tobool");
|
|
}
|
|
|
|
return Value;
|
|
}
|
|
|
|
void CodeGenFunction::EmitStoreOfScalar(llvm::Value *Value, Address Addr,
|
|
bool Volatile, QualType Ty,
|
|
AlignmentSource AlignSource,
|
|
llvm::MDNode *TBAAInfo,
|
|
bool isInit, QualType TBAABaseType,
|
|
uint64_t TBAAOffset,
|
|
bool isNontemporal) {
|
|
|
|
// Handle vectors differently to get better performance.
|
|
if (Ty->isVectorType()) {
|
|
llvm::Type *SrcTy = Value->getType();
|
|
auto *VecTy = cast<llvm::VectorType>(SrcTy);
|
|
// Handle vec3 special.
|
|
if (VecTy->getNumElements() == 3) {
|
|
// Our source is a vec3, do a shuffle vector to make it a vec4.
|
|
llvm::Constant *Mask[] = {Builder.getInt32(0), Builder.getInt32(1),
|
|
Builder.getInt32(2),
|
|
llvm::UndefValue::get(Builder.getInt32Ty())};
|
|
llvm::Value *MaskV = llvm::ConstantVector::get(Mask);
|
|
Value = Builder.CreateShuffleVector(Value,
|
|
llvm::UndefValue::get(VecTy),
|
|
MaskV, "extractVec");
|
|
SrcTy = llvm::VectorType::get(VecTy->getElementType(), 4);
|
|
}
|
|
if (Addr.getElementType() != SrcTy) {
|
|
Addr = Builder.CreateElementBitCast(Addr, SrcTy, "storetmp");
|
|
}
|
|
}
|
|
|
|
Value = EmitToMemory(Value, Ty);
|
|
|
|
LValue AtomicLValue =
|
|
LValue::MakeAddr(Addr, Ty, getContext(), AlignSource, TBAAInfo);
|
|
if (Ty->isAtomicType() ||
|
|
(!isInit && LValueIsSuitableForInlineAtomic(AtomicLValue))) {
|
|
EmitAtomicStore(RValue::get(Value), AtomicLValue, isInit);
|
|
return;
|
|
}
|
|
|
|
llvm::StoreInst *Store = Builder.CreateStore(Value, Addr, Volatile);
|
|
if (isNontemporal) {
|
|
llvm::MDNode *Node =
|
|
llvm::MDNode::get(Store->getContext(),
|
|
llvm::ConstantAsMetadata::get(Builder.getInt32(1)));
|
|
Store->setMetadata(CGM.getModule().getMDKindID("nontemporal"), Node);
|
|
}
|
|
if (TBAAInfo) {
|
|
llvm::MDNode *TBAAPath = CGM.getTBAAStructTagInfo(TBAABaseType, TBAAInfo,
|
|
TBAAOffset);
|
|
if (TBAAPath)
|
|
CGM.DecorateInstructionWithTBAA(Store, TBAAPath,
|
|
false /*ConvertTypeToTag*/);
|
|
}
|
|
}
|
|
|
|
void CodeGenFunction::EmitStoreOfScalar(llvm::Value *value, LValue lvalue,
|
|
bool isInit) {
|
|
EmitStoreOfScalar(value, lvalue.getAddress(), lvalue.isVolatile(),
|
|
lvalue.getType(), lvalue.getAlignmentSource(),
|
|
lvalue.getTBAAInfo(), isInit, lvalue.getTBAABaseType(),
|
|
lvalue.getTBAAOffset(), lvalue.isNontemporal());
|
|
}
|
|
|
|
/// EmitLoadOfLValue - Given an expression that represents a value lvalue, this
|
|
/// method emits the address of the lvalue, then loads the result as an rvalue,
|
|
/// returning the rvalue.
|
|
RValue CodeGenFunction::EmitLoadOfLValue(LValue LV, SourceLocation Loc) {
|
|
if (LV.isObjCWeak()) {
|
|
// load of a __weak object.
|
|
Address AddrWeakObj = LV.getAddress();
|
|
return RValue::get(CGM.getObjCRuntime().EmitObjCWeakRead(*this,
|
|
AddrWeakObj));
|
|
}
|
|
if (LV.getQuals().getObjCLifetime() == Qualifiers::OCL_Weak) {
|
|
// In MRC mode, we do a load+autorelease.
|
|
if (!getLangOpts().ObjCAutoRefCount) {
|
|
return RValue::get(EmitARCLoadWeak(LV.getAddress()));
|
|
}
|
|
|
|
// In ARC mode, we load retained and then consume the value.
|
|
llvm::Value *Object = EmitARCLoadWeakRetained(LV.getAddress());
|
|
Object = EmitObjCConsumeObject(LV.getType(), Object);
|
|
return RValue::get(Object);
|
|
}
|
|
|
|
if (LV.isSimple()) {
|
|
assert(!LV.getType()->isFunctionType());
|
|
|
|
// Everything needs a load.
|
|
return RValue::get(EmitLoadOfScalar(LV, Loc));
|
|
}
|
|
|
|
if (LV.isVectorElt()) {
|
|
llvm::LoadInst *Load = Builder.CreateLoad(LV.getVectorAddress(),
|
|
LV.isVolatileQualified());
|
|
return RValue::get(Builder.CreateExtractElement(Load, LV.getVectorIdx(),
|
|
"vecext"));
|
|
}
|
|
|
|
// If this is a reference to a subset of the elements of a vector, either
|
|
// shuffle the input or extract/insert them as appropriate.
|
|
if (LV.isExtVectorElt())
|
|
return EmitLoadOfExtVectorElementLValue(LV);
|
|
|
|
// Global Register variables always invoke intrinsics
|
|
if (LV.isGlobalReg())
|
|
return EmitLoadOfGlobalRegLValue(LV);
|
|
|
|
assert(LV.isBitField() && "Unknown LValue type!");
|
|
return EmitLoadOfBitfieldLValue(LV);
|
|
}
|
|
|
|
RValue CodeGenFunction::EmitLoadOfBitfieldLValue(LValue LV) {
|
|
const CGBitFieldInfo &Info = LV.getBitFieldInfo();
|
|
|
|
// Get the output type.
|
|
llvm::Type *ResLTy = ConvertType(LV.getType());
|
|
|
|
Address Ptr = LV.getBitFieldAddress();
|
|
llvm::Value *Val = Builder.CreateLoad(Ptr, LV.isVolatileQualified(), "bf.load");
|
|
|
|
if (Info.IsSigned) {
|
|
assert(static_cast<unsigned>(Info.Offset + Info.Size) <= Info.StorageSize);
|
|
unsigned HighBits = Info.StorageSize - Info.Offset - Info.Size;
|
|
if (HighBits)
|
|
Val = Builder.CreateShl(Val, HighBits, "bf.shl");
|
|
if (Info.Offset + HighBits)
|
|
Val = Builder.CreateAShr(Val, Info.Offset + HighBits, "bf.ashr");
|
|
} else {
|
|
if (Info.Offset)
|
|
Val = Builder.CreateLShr(Val, Info.Offset, "bf.lshr");
|
|
if (static_cast<unsigned>(Info.Offset) + Info.Size < Info.StorageSize)
|
|
Val = Builder.CreateAnd(Val, llvm::APInt::getLowBitsSet(Info.StorageSize,
|
|
Info.Size),
|
|
"bf.clear");
|
|
}
|
|
Val = Builder.CreateIntCast(Val, ResLTy, Info.IsSigned, "bf.cast");
|
|
|
|
return RValue::get(Val);
|
|
}
|
|
|
|
// If this is a reference to a subset of the elements of a vector, create an
|
|
// appropriate shufflevector.
|
|
RValue CodeGenFunction::EmitLoadOfExtVectorElementLValue(LValue LV) {
|
|
llvm::Value *Vec = Builder.CreateLoad(LV.getExtVectorAddress(),
|
|
LV.isVolatileQualified());
|
|
|
|
const llvm::Constant *Elts = LV.getExtVectorElts();
|
|
|
|
// If the result of the expression is a non-vector type, we must be extracting
|
|
// a single element. Just codegen as an extractelement.
|
|
const VectorType *ExprVT = LV.getType()->getAs<VectorType>();
|
|
if (!ExprVT) {
|
|
unsigned InIdx = getAccessedFieldNo(0, Elts);
|
|
llvm::Value *Elt = llvm::ConstantInt::get(SizeTy, InIdx);
|
|
return RValue::get(Builder.CreateExtractElement(Vec, Elt));
|
|
}
|
|
|
|
// Always use shuffle vector to try to retain the original program structure
|
|
unsigned NumResultElts = ExprVT->getNumElements();
|
|
|
|
SmallVector<llvm::Constant*, 4> Mask;
|
|
for (unsigned i = 0; i != NumResultElts; ++i)
|
|
Mask.push_back(Builder.getInt32(getAccessedFieldNo(i, Elts)));
|
|
|
|
llvm::Value *MaskV = llvm::ConstantVector::get(Mask);
|
|
Vec = Builder.CreateShuffleVector(Vec, llvm::UndefValue::get(Vec->getType()),
|
|
MaskV);
|
|
return RValue::get(Vec);
|
|
}
|
|
|
|
/// @brief Generates lvalue for partial ext_vector access.
|
|
Address CodeGenFunction::EmitExtVectorElementLValue(LValue LV) {
|
|
Address VectorAddress = LV.getExtVectorAddress();
|
|
const VectorType *ExprVT = LV.getType()->getAs<VectorType>();
|
|
QualType EQT = ExprVT->getElementType();
|
|
llvm::Type *VectorElementTy = CGM.getTypes().ConvertType(EQT);
|
|
|
|
Address CastToPointerElement =
|
|
Builder.CreateElementBitCast(VectorAddress, VectorElementTy,
|
|
"conv.ptr.element");
|
|
|
|
const llvm::Constant *Elts = LV.getExtVectorElts();
|
|
unsigned ix = getAccessedFieldNo(0, Elts);
|
|
|
|
Address VectorBasePtrPlusIx =
|
|
Builder.CreateConstInBoundsGEP(CastToPointerElement, ix,
|
|
getContext().getTypeSizeInChars(EQT),
|
|
"vector.elt");
|
|
|
|
return VectorBasePtrPlusIx;
|
|
}
|
|
|
|
/// @brief Load of global gamed gegisters are always calls to intrinsics.
|
|
RValue CodeGenFunction::EmitLoadOfGlobalRegLValue(LValue LV) {
|
|
assert((LV.getType()->isIntegerType() || LV.getType()->isPointerType()) &&
|
|
"Bad type for register variable");
|
|
llvm::MDNode *RegName = cast<llvm::MDNode>(
|
|
cast<llvm::MetadataAsValue>(LV.getGlobalReg())->getMetadata());
|
|
|
|
// We accept integer and pointer types only
|
|
llvm::Type *OrigTy = CGM.getTypes().ConvertType(LV.getType());
|
|
llvm::Type *Ty = OrigTy;
|
|
if (OrigTy->isPointerTy())
|
|
Ty = CGM.getTypes().getDataLayout().getIntPtrType(OrigTy);
|
|
llvm::Type *Types[] = { Ty };
|
|
|
|
llvm::Value *F = CGM.getIntrinsic(llvm::Intrinsic::read_register, Types);
|
|
llvm::Value *Call = Builder.CreateCall(
|
|
F, llvm::MetadataAsValue::get(Ty->getContext(), RegName));
|
|
if (OrigTy->isPointerTy())
|
|
Call = Builder.CreateIntToPtr(Call, OrigTy);
|
|
return RValue::get(Call);
|
|
}
|
|
|
|
|
|
/// EmitStoreThroughLValue - Store the specified rvalue into the specified
|
|
/// lvalue, where both are guaranteed to the have the same type, and that type
|
|
/// is 'Ty'.
|
|
void CodeGenFunction::EmitStoreThroughLValue(RValue Src, LValue Dst,
|
|
bool isInit) {
|
|
if (!Dst.isSimple()) {
|
|
if (Dst.isVectorElt()) {
|
|
// Read/modify/write the vector, inserting the new element.
|
|
llvm::Value *Vec = Builder.CreateLoad(Dst.getVectorAddress(),
|
|
Dst.isVolatileQualified());
|
|
Vec = Builder.CreateInsertElement(Vec, Src.getScalarVal(),
|
|
Dst.getVectorIdx(), "vecins");
|
|
Builder.CreateStore(Vec, Dst.getVectorAddress(),
|
|
Dst.isVolatileQualified());
|
|
return;
|
|
}
|
|
|
|
// If this is an update of extended vector elements, insert them as
|
|
// appropriate.
|
|
if (Dst.isExtVectorElt())
|
|
return EmitStoreThroughExtVectorComponentLValue(Src, Dst);
|
|
|
|
if (Dst.isGlobalReg())
|
|
return EmitStoreThroughGlobalRegLValue(Src, Dst);
|
|
|
|
assert(Dst.isBitField() && "Unknown LValue type");
|
|
return EmitStoreThroughBitfieldLValue(Src, Dst);
|
|
}
|
|
|
|
// There's special magic for assigning into an ARC-qualified l-value.
|
|
if (Qualifiers::ObjCLifetime Lifetime = Dst.getQuals().getObjCLifetime()) {
|
|
switch (Lifetime) {
|
|
case Qualifiers::OCL_None:
|
|
llvm_unreachable("present but none");
|
|
|
|
case Qualifiers::OCL_ExplicitNone:
|
|
// nothing special
|
|
break;
|
|
|
|
case Qualifiers::OCL_Strong:
|
|
EmitARCStoreStrong(Dst, Src.getScalarVal(), /*ignore*/ true);
|
|
return;
|
|
|
|
case Qualifiers::OCL_Weak:
|
|
EmitARCStoreWeak(Dst.getAddress(), Src.getScalarVal(), /*ignore*/ true);
|
|
return;
|
|
|
|
case Qualifiers::OCL_Autoreleasing:
|
|
Src = RValue::get(EmitObjCExtendObjectLifetime(Dst.getType(),
|
|
Src.getScalarVal()));
|
|
// fall into the normal path
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (Dst.isObjCWeak() && !Dst.isNonGC()) {
|
|
// load of a __weak object.
|
|
Address LvalueDst = Dst.getAddress();
|
|
llvm::Value *src = Src.getScalarVal();
|
|
CGM.getObjCRuntime().EmitObjCWeakAssign(*this, src, LvalueDst);
|
|
return;
|
|
}
|
|
|
|
if (Dst.isObjCStrong() && !Dst.isNonGC()) {
|
|
// load of a __strong object.
|
|
Address LvalueDst = Dst.getAddress();
|
|
llvm::Value *src = Src.getScalarVal();
|
|
if (Dst.isObjCIvar()) {
|
|
assert(Dst.getBaseIvarExp() && "BaseIvarExp is NULL");
|
|
llvm::Type *ResultType = IntPtrTy;
|
|
Address dst = EmitPointerWithAlignment(Dst.getBaseIvarExp());
|
|
llvm::Value *RHS = dst.getPointer();
|
|
RHS = Builder.CreatePtrToInt(RHS, ResultType, "sub.ptr.rhs.cast");
|
|
llvm::Value *LHS =
|
|
Builder.CreatePtrToInt(LvalueDst.getPointer(), ResultType,
|
|
"sub.ptr.lhs.cast");
|
|
llvm::Value *BytesBetween = Builder.CreateSub(LHS, RHS, "ivar.offset");
|
|
CGM.getObjCRuntime().EmitObjCIvarAssign(*this, src, dst,
|
|
BytesBetween);
|
|
} else if (Dst.isGlobalObjCRef()) {
|
|
CGM.getObjCRuntime().EmitObjCGlobalAssign(*this, src, LvalueDst,
|
|
Dst.isThreadLocalRef());
|
|
}
|
|
else
|
|
CGM.getObjCRuntime().EmitObjCStrongCastAssign(*this, src, LvalueDst);
|
|
return;
|
|
}
|
|
|
|
assert(Src.isScalar() && "Can't emit an agg store with this method");
|
|
EmitStoreOfScalar(Src.getScalarVal(), Dst, isInit);
|
|
}
|
|
|
|
void CodeGenFunction::EmitStoreThroughBitfieldLValue(RValue Src, LValue Dst,
|
|
llvm::Value **Result) {
|
|
const CGBitFieldInfo &Info = Dst.getBitFieldInfo();
|
|
llvm::Type *ResLTy = ConvertTypeForMem(Dst.getType());
|
|
Address Ptr = Dst.getBitFieldAddress();
|
|
|
|
// Get the source value, truncated to the width of the bit-field.
|
|
llvm::Value *SrcVal = Src.getScalarVal();
|
|
|
|
// Cast the source to the storage type and shift it into place.
|
|
SrcVal = Builder.CreateIntCast(SrcVal, Ptr.getElementType(),
|
|
/*IsSigned=*/false);
|
|
llvm::Value *MaskedVal = SrcVal;
|
|
|
|
// See if there are other bits in the bitfield's storage we'll need to load
|
|
// and mask together with source before storing.
|
|
if (Info.StorageSize != Info.Size) {
|
|
assert(Info.StorageSize > Info.Size && "Invalid bitfield size.");
|
|
llvm::Value *Val =
|
|
Builder.CreateLoad(Ptr, Dst.isVolatileQualified(), "bf.load");
|
|
|
|
// Mask the source value as needed.
|
|
if (!hasBooleanRepresentation(Dst.getType()))
|
|
SrcVal = Builder.CreateAnd(SrcVal,
|
|
llvm::APInt::getLowBitsSet(Info.StorageSize,
|
|
Info.Size),
|
|
"bf.value");
|
|
MaskedVal = SrcVal;
|
|
if (Info.Offset)
|
|
SrcVal = Builder.CreateShl(SrcVal, Info.Offset, "bf.shl");
|
|
|
|
// Mask out the original value.
|
|
Val = Builder.CreateAnd(Val,
|
|
~llvm::APInt::getBitsSet(Info.StorageSize,
|
|
Info.Offset,
|
|
Info.Offset + Info.Size),
|
|
"bf.clear");
|
|
|
|
// Or together the unchanged values and the source value.
|
|
SrcVal = Builder.CreateOr(Val, SrcVal, "bf.set");
|
|
} else {
|
|
assert(Info.Offset == 0);
|
|
}
|
|
|
|
// Write the new value back out.
|
|
Builder.CreateStore(SrcVal, Ptr, Dst.isVolatileQualified());
|
|
|
|
// Return the new value of the bit-field, if requested.
|
|
if (Result) {
|
|
llvm::Value *ResultVal = MaskedVal;
|
|
|
|
// Sign extend the value if needed.
|
|
if (Info.IsSigned) {
|
|
assert(Info.Size <= Info.StorageSize);
|
|
unsigned HighBits = Info.StorageSize - Info.Size;
|
|
if (HighBits) {
|
|
ResultVal = Builder.CreateShl(ResultVal, HighBits, "bf.result.shl");
|
|
ResultVal = Builder.CreateAShr(ResultVal, HighBits, "bf.result.ashr");
|
|
}
|
|
}
|
|
|
|
ResultVal = Builder.CreateIntCast(ResultVal, ResLTy, Info.IsSigned,
|
|
"bf.result.cast");
|
|
*Result = EmitFromMemory(ResultVal, Dst.getType());
|
|
}
|
|
}
|
|
|
|
void CodeGenFunction::EmitStoreThroughExtVectorComponentLValue(RValue Src,
|
|
LValue Dst) {
|
|
// This access turns into a read/modify/write of the vector. Load the input
|
|
// value now.
|
|
llvm::Value *Vec = Builder.CreateLoad(Dst.getExtVectorAddress(),
|
|
Dst.isVolatileQualified());
|
|
const llvm::Constant *Elts = Dst.getExtVectorElts();
|
|
|
|
llvm::Value *SrcVal = Src.getScalarVal();
|
|
|
|
if (const VectorType *VTy = Dst.getType()->getAs<VectorType>()) {
|
|
unsigned NumSrcElts = VTy->getNumElements();
|
|
unsigned NumDstElts = Vec->getType()->getVectorNumElements();
|
|
if (NumDstElts == NumSrcElts) {
|
|
// Use shuffle vector is the src and destination are the same number of
|
|
// elements and restore the vector mask since it is on the side it will be
|
|
// stored.
|
|
SmallVector<llvm::Constant*, 4> Mask(NumDstElts);
|
|
for (unsigned i = 0; i != NumSrcElts; ++i)
|
|
Mask[getAccessedFieldNo(i, Elts)] = Builder.getInt32(i);
|
|
|
|
llvm::Value *MaskV = llvm::ConstantVector::get(Mask);
|
|
Vec = Builder.CreateShuffleVector(SrcVal,
|
|
llvm::UndefValue::get(Vec->getType()),
|
|
MaskV);
|
|
} else if (NumDstElts > NumSrcElts) {
|
|
// Extended the source vector to the same length and then shuffle it
|
|
// into the destination.
|
|
// FIXME: since we're shuffling with undef, can we just use the indices
|
|
// into that? This could be simpler.
|
|
SmallVector<llvm::Constant*, 4> ExtMask;
|
|
for (unsigned i = 0; i != NumSrcElts; ++i)
|
|
ExtMask.push_back(Builder.getInt32(i));
|
|
ExtMask.resize(NumDstElts, llvm::UndefValue::get(Int32Ty));
|
|
llvm::Value *ExtMaskV = llvm::ConstantVector::get(ExtMask);
|
|
llvm::Value *ExtSrcVal =
|
|
Builder.CreateShuffleVector(SrcVal,
|
|
llvm::UndefValue::get(SrcVal->getType()),
|
|
ExtMaskV);
|
|
// build identity
|
|
SmallVector<llvm::Constant*, 4> Mask;
|
|
for (unsigned i = 0; i != NumDstElts; ++i)
|
|
Mask.push_back(Builder.getInt32(i));
|
|
|
|
// When the vector size is odd and .odd or .hi is used, the last element
|
|
// of the Elts constant array will be one past the size of the vector.
|
|
// Ignore the last element here, if it is greater than the mask size.
|
|
if (getAccessedFieldNo(NumSrcElts - 1, Elts) == Mask.size())
|
|
NumSrcElts--;
|
|
|
|
// modify when what gets shuffled in
|
|
for (unsigned i = 0; i != NumSrcElts; ++i)
|
|
Mask[getAccessedFieldNo(i, Elts)] = Builder.getInt32(i+NumDstElts);
|
|
llvm::Value *MaskV = llvm::ConstantVector::get(Mask);
|
|
Vec = Builder.CreateShuffleVector(Vec, ExtSrcVal, MaskV);
|
|
} else {
|
|
// We should never shorten the vector
|
|
llvm_unreachable("unexpected shorten vector length");
|
|
}
|
|
} else {
|
|
// If the Src is a scalar (not a vector) it must be updating one element.
|
|
unsigned InIdx = getAccessedFieldNo(0, Elts);
|
|
llvm::Value *Elt = llvm::ConstantInt::get(SizeTy, InIdx);
|
|
Vec = Builder.CreateInsertElement(Vec, SrcVal, Elt);
|
|
}
|
|
|
|
Builder.CreateStore(Vec, Dst.getExtVectorAddress(),
|
|
Dst.isVolatileQualified());
|
|
}
|
|
|
|
/// @brief Store of global named registers are always calls to intrinsics.
|
|
void CodeGenFunction::EmitStoreThroughGlobalRegLValue(RValue Src, LValue Dst) {
|
|
assert((Dst.getType()->isIntegerType() || Dst.getType()->isPointerType()) &&
|
|
"Bad type for register variable");
|
|
llvm::MDNode *RegName = cast<llvm::MDNode>(
|
|
cast<llvm::MetadataAsValue>(Dst.getGlobalReg())->getMetadata());
|
|
assert(RegName && "Register LValue is not metadata");
|
|
|
|
// We accept integer and pointer types only
|
|
llvm::Type *OrigTy = CGM.getTypes().ConvertType(Dst.getType());
|
|
llvm::Type *Ty = OrigTy;
|
|
if (OrigTy->isPointerTy())
|
|
Ty = CGM.getTypes().getDataLayout().getIntPtrType(OrigTy);
|
|
llvm::Type *Types[] = { Ty };
|
|
|
|
llvm::Value *F = CGM.getIntrinsic(llvm::Intrinsic::write_register, Types);
|
|
llvm::Value *Value = Src.getScalarVal();
|
|
if (OrigTy->isPointerTy())
|
|
Value = Builder.CreatePtrToInt(Value, Ty);
|
|
Builder.CreateCall(
|
|
F, {llvm::MetadataAsValue::get(Ty->getContext(), RegName), Value});
|
|
}
|
|
|
|
// setObjCGCLValueClass - sets class of the lvalue for the purpose of
|
|
// generating write-barries API. It is currently a global, ivar,
|
|
// or neither.
|
|
static void setObjCGCLValueClass(const ASTContext &Ctx, const Expr *E,
|
|
LValue &LV,
|
|
bool IsMemberAccess=false) {
|
|
if (Ctx.getLangOpts().getGC() == LangOptions::NonGC)
|
|
return;
|
|
|
|
if (isa<ObjCIvarRefExpr>(E)) {
|
|
QualType ExpTy = E->getType();
|
|
if (IsMemberAccess && ExpTy->isPointerType()) {
|
|
// If ivar is a structure pointer, assigning to field of
|
|
// this struct follows gcc's behavior and makes it a non-ivar
|
|
// writer-barrier conservatively.
|
|
ExpTy = ExpTy->getAs<PointerType>()->getPointeeType();
|
|
if (ExpTy->isRecordType()) {
|
|
LV.setObjCIvar(false);
|
|
return;
|
|
}
|
|
}
|
|
LV.setObjCIvar(true);
|
|
auto *Exp = cast<ObjCIvarRefExpr>(const_cast<Expr *>(E));
|
|
LV.setBaseIvarExp(Exp->getBase());
|
|
LV.setObjCArray(E->getType()->isArrayType());
|
|
return;
|
|
}
|
|
|
|
if (const auto *Exp = dyn_cast<DeclRefExpr>(E)) {
|
|
if (const auto *VD = dyn_cast<VarDecl>(Exp->getDecl())) {
|
|
if (VD->hasGlobalStorage()) {
|
|
LV.setGlobalObjCRef(true);
|
|
LV.setThreadLocalRef(VD->getTLSKind() != VarDecl::TLS_None);
|
|
}
|
|
}
|
|
LV.setObjCArray(E->getType()->isArrayType());
|
|
return;
|
|
}
|
|
|
|
if (const auto *Exp = dyn_cast<UnaryOperator>(E)) {
|
|
setObjCGCLValueClass(Ctx, Exp->getSubExpr(), LV, IsMemberAccess);
|
|
return;
|
|
}
|
|
|
|
if (const auto *Exp = dyn_cast<ParenExpr>(E)) {
|
|
setObjCGCLValueClass(Ctx, Exp->getSubExpr(), LV, IsMemberAccess);
|
|
if (LV.isObjCIvar()) {
|
|
// If cast is to a structure pointer, follow gcc's behavior and make it
|
|
// a non-ivar write-barrier.
|
|
QualType ExpTy = E->getType();
|
|
if (ExpTy->isPointerType())
|
|
ExpTy = ExpTy->getAs<PointerType>()->getPointeeType();
|
|
if (ExpTy->isRecordType())
|
|
LV.setObjCIvar(false);
|
|
}
|
|
return;
|
|
}
|
|
|
|
if (const auto *Exp = dyn_cast<GenericSelectionExpr>(E)) {
|
|
setObjCGCLValueClass(Ctx, Exp->getResultExpr(), LV);
|
|
return;
|
|
}
|
|
|
|
if (const auto *Exp = dyn_cast<ImplicitCastExpr>(E)) {
|
|
setObjCGCLValueClass(Ctx, Exp->getSubExpr(), LV, IsMemberAccess);
|
|
return;
|
|
}
|
|
|
|
if (const auto *Exp = dyn_cast<CStyleCastExpr>(E)) {
|
|
setObjCGCLValueClass(Ctx, Exp->getSubExpr(), LV, IsMemberAccess);
|
|
return;
|
|
}
|
|
|
|
if (const auto *Exp = dyn_cast<ObjCBridgedCastExpr>(E)) {
|
|
setObjCGCLValueClass(Ctx, Exp->getSubExpr(), LV, IsMemberAccess);
|
|
return;
|
|
}
|
|
|
|
if (const auto *Exp = dyn_cast<ArraySubscriptExpr>(E)) {
|
|
setObjCGCLValueClass(Ctx, Exp->getBase(), LV);
|
|
if (LV.isObjCIvar() && !LV.isObjCArray())
|
|
// Using array syntax to assigning to what an ivar points to is not
|
|
// same as assigning to the ivar itself. {id *Names;} Names[i] = 0;
|
|
LV.setObjCIvar(false);
|
|
else if (LV.isGlobalObjCRef() && !LV.isObjCArray())
|
|
// Using array syntax to assigning to what global points to is not
|
|
// same as assigning to the global itself. {id *G;} G[i] = 0;
|
|
LV.setGlobalObjCRef(false);
|
|
return;
|
|
}
|
|
|
|
if (const auto *Exp = dyn_cast<MemberExpr>(E)) {
|
|
setObjCGCLValueClass(Ctx, Exp->getBase(), LV, true);
|
|
// We don't know if member is an 'ivar', but this flag is looked at
|
|
// only in the context of LV.isObjCIvar().
|
|
LV.setObjCArray(E->getType()->isArrayType());
|
|
return;
|
|
}
|
|
}
|
|
|
|
static llvm::Value *
|
|
EmitBitCastOfLValueToProperType(CodeGenFunction &CGF,
|
|
llvm::Value *V, llvm::Type *IRType,
|
|
StringRef Name = StringRef()) {
|
|
unsigned AS = cast<llvm::PointerType>(V->getType())->getAddressSpace();
|
|
return CGF.Builder.CreateBitCast(V, IRType->getPointerTo(AS), Name);
|
|
}
|
|
|
|
static LValue EmitThreadPrivateVarDeclLValue(
|
|
CodeGenFunction &CGF, const VarDecl *VD, QualType T, Address Addr,
|
|
llvm::Type *RealVarTy, SourceLocation Loc) {
|
|
Addr = CGF.CGM.getOpenMPRuntime().getAddrOfThreadPrivate(CGF, VD, Addr, Loc);
|
|
Addr = CGF.Builder.CreateElementBitCast(Addr, RealVarTy);
|
|
return CGF.MakeAddrLValue(Addr, T, AlignmentSource::Decl);
|
|
}
|
|
|
|
Address CodeGenFunction::EmitLoadOfReference(Address Addr,
|
|
const ReferenceType *RefTy,
|
|
AlignmentSource *Source) {
|
|
llvm::Value *Ptr = Builder.CreateLoad(Addr);
|
|
return Address(Ptr, getNaturalTypeAlignment(RefTy->getPointeeType(),
|
|
Source, /*forPointee*/ true));
|
|
|
|
}
|
|
|
|
LValue CodeGenFunction::EmitLoadOfReferenceLValue(Address RefAddr,
|
|
const ReferenceType *RefTy) {
|
|
AlignmentSource Source;
|
|
Address Addr = EmitLoadOfReference(RefAddr, RefTy, &Source);
|
|
return MakeAddrLValue(Addr, RefTy->getPointeeType(), Source);
|
|
}
|
|
|
|
Address CodeGenFunction::EmitLoadOfPointer(Address Ptr,
|
|
const PointerType *PtrTy,
|
|
AlignmentSource *Source) {
|
|
llvm::Value *Addr = Builder.CreateLoad(Ptr);
|
|
return Address(Addr, getNaturalTypeAlignment(PtrTy->getPointeeType(), Source,
|
|
/*forPointeeType=*/true));
|
|
}
|
|
|
|
LValue CodeGenFunction::EmitLoadOfPointerLValue(Address PtrAddr,
|
|
const PointerType *PtrTy) {
|
|
AlignmentSource Source;
|
|
Address Addr = EmitLoadOfPointer(PtrAddr, PtrTy, &Source);
|
|
return MakeAddrLValue(Addr, PtrTy->getPointeeType(), Source);
|
|
}
|
|
|
|
static LValue EmitGlobalVarDeclLValue(CodeGenFunction &CGF,
|
|
const Expr *E, const VarDecl *VD) {
|
|
QualType T = E->getType();
|
|
|
|
// If it's thread_local, emit a call to its wrapper function instead.
|
|
if (VD->getTLSKind() == VarDecl::TLS_Dynamic &&
|
|
CGF.CGM.getCXXABI().usesThreadWrapperFunction())
|
|
return CGF.CGM.getCXXABI().EmitThreadLocalVarDeclLValue(CGF, VD, T);
|
|
|
|
llvm::Value *V = CGF.CGM.GetAddrOfGlobalVar(VD);
|
|
llvm::Type *RealVarTy = CGF.getTypes().ConvertTypeForMem(VD->getType());
|
|
V = EmitBitCastOfLValueToProperType(CGF, V, RealVarTy);
|
|
CharUnits Alignment = CGF.getContext().getDeclAlign(VD);
|
|
Address Addr(V, Alignment);
|
|
LValue LV;
|
|
// Emit reference to the private copy of the variable if it is an OpenMP
|
|
// threadprivate variable.
|
|
if (CGF.getLangOpts().OpenMP && VD->hasAttr<OMPThreadPrivateDeclAttr>())
|
|
return EmitThreadPrivateVarDeclLValue(CGF, VD, T, Addr, RealVarTy,
|
|
E->getExprLoc());
|
|
if (auto RefTy = VD->getType()->getAs<ReferenceType>()) {
|
|
LV = CGF.EmitLoadOfReferenceLValue(Addr, RefTy);
|
|
} else {
|
|
LV = CGF.MakeAddrLValue(Addr, T, AlignmentSource::Decl);
|
|
}
|
|
setObjCGCLValueClass(CGF.getContext(), E, LV);
|
|
return LV;
|
|
}
|
|
|
|
static LValue EmitFunctionDeclLValue(CodeGenFunction &CGF,
|
|
const Expr *E, const FunctionDecl *FD) {
|
|
llvm::Value *V = CGF.CGM.GetAddrOfFunction(FD);
|
|
if (!FD->hasPrototype()) {
|
|
if (const FunctionProtoType *Proto =
|
|
FD->getType()->getAs<FunctionProtoType>()) {
|
|
// Ugly case: for a K&R-style definition, the type of the definition
|
|
// isn't the same as the type of a use. Correct for this with a
|
|
// bitcast.
|
|
QualType NoProtoType =
|
|
CGF.getContext().getFunctionNoProtoType(Proto->getReturnType());
|
|
NoProtoType = CGF.getContext().getPointerType(NoProtoType);
|
|
V = CGF.Builder.CreateBitCast(V, CGF.ConvertType(NoProtoType));
|
|
}
|
|
}
|
|
CharUnits Alignment = CGF.getContext().getDeclAlign(FD);
|
|
return CGF.MakeAddrLValue(V, E->getType(), Alignment, AlignmentSource::Decl);
|
|
}
|
|
|
|
static LValue EmitCapturedFieldLValue(CodeGenFunction &CGF, const FieldDecl *FD,
|
|
llvm::Value *ThisValue) {
|
|
QualType TagType = CGF.getContext().getTagDeclType(FD->getParent());
|
|
LValue LV = CGF.MakeNaturalAlignAddrLValue(ThisValue, TagType);
|
|
return CGF.EmitLValueForField(LV, FD);
|
|
}
|
|
|
|
/// Named Registers are named metadata pointing to the register name
|
|
/// which will be read from/written to as an argument to the intrinsic
|
|
/// @llvm.read/write_register.
|
|
/// So far, only the name is being passed down, but other options such as
|
|
/// register type, allocation type or even optimization options could be
|
|
/// passed down via the metadata node.
|
|
static LValue EmitGlobalNamedRegister(const VarDecl *VD, CodeGenModule &CGM) {
|
|
SmallString<64> Name("llvm.named.register.");
|
|
AsmLabelAttr *Asm = VD->getAttr<AsmLabelAttr>();
|
|
assert(Asm->getLabel().size() < 64-Name.size() &&
|
|
"Register name too big");
|
|
Name.append(Asm->getLabel());
|
|
llvm::NamedMDNode *M =
|
|
CGM.getModule().getOrInsertNamedMetadata(Name);
|
|
if (M->getNumOperands() == 0) {
|
|
llvm::MDString *Str = llvm::MDString::get(CGM.getLLVMContext(),
|
|
Asm->getLabel());
|
|
llvm::Metadata *Ops[] = {Str};
|
|
M->addOperand(llvm::MDNode::get(CGM.getLLVMContext(), Ops));
|
|
}
|
|
|
|
CharUnits Alignment = CGM.getContext().getDeclAlign(VD);
|
|
|
|
llvm::Value *Ptr =
|
|
llvm::MetadataAsValue::get(CGM.getLLVMContext(), M->getOperand(0));
|
|
return LValue::MakeGlobalReg(Address(Ptr, Alignment), VD->getType());
|
|
}
|
|
|
|
LValue CodeGenFunction::EmitDeclRefLValue(const DeclRefExpr *E) {
|
|
const NamedDecl *ND = E->getDecl();
|
|
QualType T = E->getType();
|
|
|
|
if (const auto *VD = dyn_cast<VarDecl>(ND)) {
|
|
// Global Named registers access via intrinsics only
|
|
if (VD->getStorageClass() == SC_Register &&
|
|
VD->hasAttr<AsmLabelAttr>() && !VD->isLocalVarDecl())
|
|
return EmitGlobalNamedRegister(VD, CGM);
|
|
|
|
// A DeclRefExpr for a reference initialized by a constant expression can
|
|
// appear without being odr-used. Directly emit the constant initializer.
|
|
const Expr *Init = VD->getAnyInitializer(VD);
|
|
if (Init && !isa<ParmVarDecl>(VD) && VD->getType()->isReferenceType() &&
|
|
VD->isUsableInConstantExpressions(getContext()) &&
|
|
VD->checkInitIsICE() &&
|
|
// Do not emit if it is private OpenMP variable.
|
|
!(E->refersToEnclosingVariableOrCapture() && CapturedStmtInfo &&
|
|
LocalDeclMap.count(VD))) {
|
|
llvm::Constant *Val =
|
|
CGM.EmitConstantValue(*VD->evaluateValue(), VD->getType(), this);
|
|
assert(Val && "failed to emit reference constant expression");
|
|
// FIXME: Eventually we will want to emit vector element references.
|
|
|
|
// Should we be using the alignment of the constant pointer we emitted?
|
|
CharUnits Alignment = getNaturalTypeAlignment(E->getType(), nullptr,
|
|
/*pointee*/ true);
|
|
|
|
return MakeAddrLValue(Address(Val, Alignment), T, AlignmentSource::Decl);
|
|
}
|
|
|
|
// Check for captured variables.
|
|
if (E->refersToEnclosingVariableOrCapture()) {
|
|
if (auto *FD = LambdaCaptureFields.lookup(VD))
|
|
return EmitCapturedFieldLValue(*this, FD, CXXABIThisValue);
|
|
else if (CapturedStmtInfo) {
|
|
auto it = LocalDeclMap.find(VD);
|
|
if (it != LocalDeclMap.end()) {
|
|
if (auto RefTy = VD->getType()->getAs<ReferenceType>()) {
|
|
return EmitLoadOfReferenceLValue(it->second, RefTy);
|
|
}
|
|
return MakeAddrLValue(it->second, T);
|
|
}
|
|
LValue CapLVal =
|
|
EmitCapturedFieldLValue(*this, CapturedStmtInfo->lookup(VD),
|
|
CapturedStmtInfo->getContextValue());
|
|
return MakeAddrLValue(
|
|
Address(CapLVal.getPointer(), getContext().getDeclAlign(VD)),
|
|
CapLVal.getType(), AlignmentSource::Decl);
|
|
}
|
|
|
|
assert(isa<BlockDecl>(CurCodeDecl));
|
|
Address addr = GetAddrOfBlockDecl(VD, VD->hasAttr<BlocksAttr>());
|
|
return MakeAddrLValue(addr, T, AlignmentSource::Decl);
|
|
}
|
|
}
|
|
|
|
// FIXME: We should be able to assert this for FunctionDecls as well!
|
|
// FIXME: We should be able to assert this for all DeclRefExprs, not just
|
|
// those with a valid source location.
|
|
assert((ND->isUsed(false) || !isa<VarDecl>(ND) ||
|
|
!E->getLocation().isValid()) &&
|
|
"Should not use decl without marking it used!");
|
|
|
|
if (ND->hasAttr<WeakRefAttr>()) {
|
|
const auto *VD = cast<ValueDecl>(ND);
|
|
ConstantAddress Aliasee = CGM.GetWeakRefReference(VD);
|
|
return MakeAddrLValue(Aliasee, T, AlignmentSource::Decl);
|
|
}
|
|
|
|
if (const auto *VD = dyn_cast<VarDecl>(ND)) {
|
|
// Check if this is a global variable.
|
|
if (VD->hasLinkage() || VD->isStaticDataMember())
|
|
return EmitGlobalVarDeclLValue(*this, E, VD);
|
|
|
|
Address addr = Address::invalid();
|
|
|
|
// The variable should generally be present in the local decl map.
|
|
auto iter = LocalDeclMap.find(VD);
|
|
if (iter != LocalDeclMap.end()) {
|
|
addr = iter->second;
|
|
|
|
// Otherwise, it might be static local we haven't emitted yet for
|
|
// some reason; most likely, because it's in an outer function.
|
|
} else if (VD->isStaticLocal()) {
|
|
addr = Address(CGM.getOrCreateStaticVarDecl(
|
|
*VD, CGM.getLLVMLinkageVarDefinition(VD, /*isConstant=*/false)),
|
|
getContext().getDeclAlign(VD));
|
|
|
|
// No other cases for now.
|
|
} else {
|
|
llvm_unreachable("DeclRefExpr for Decl not entered in LocalDeclMap?");
|
|
}
|
|
|
|
|
|
// Check for OpenMP threadprivate variables.
|
|
if (getLangOpts().OpenMP && VD->hasAttr<OMPThreadPrivateDeclAttr>()) {
|
|
return EmitThreadPrivateVarDeclLValue(
|
|
*this, VD, T, addr, getTypes().ConvertTypeForMem(VD->getType()),
|
|
E->getExprLoc());
|
|
}
|
|
|
|
// Drill into block byref variables.
|
|
bool isBlockByref = VD->hasAttr<BlocksAttr>();
|
|
if (isBlockByref) {
|
|
addr = emitBlockByrefAddress(addr, VD);
|
|
}
|
|
|
|
// Drill into reference types.
|
|
LValue LV;
|
|
if (auto RefTy = VD->getType()->getAs<ReferenceType>()) {
|
|
LV = EmitLoadOfReferenceLValue(addr, RefTy);
|
|
} else {
|
|
LV = MakeAddrLValue(addr, T, AlignmentSource::Decl);
|
|
}
|
|
|
|
bool isLocalStorage = VD->hasLocalStorage();
|
|
|
|
bool NonGCable = isLocalStorage &&
|
|
!VD->getType()->isReferenceType() &&
|
|
!isBlockByref;
|
|
if (NonGCable) {
|
|
LV.getQuals().removeObjCGCAttr();
|
|
LV.setNonGC(true);
|
|
}
|
|
|
|
bool isImpreciseLifetime =
|
|
(isLocalStorage && !VD->hasAttr<ObjCPreciseLifetimeAttr>());
|
|
if (isImpreciseLifetime)
|
|
LV.setARCPreciseLifetime(ARCImpreciseLifetime);
|
|
setObjCGCLValueClass(getContext(), E, LV);
|
|
return LV;
|
|
}
|
|
|
|
if (const auto *FD = dyn_cast<FunctionDecl>(ND))
|
|
return EmitFunctionDeclLValue(*this, E, FD);
|
|
|
|
llvm_unreachable("Unhandled DeclRefExpr");
|
|
}
|
|
|
|
LValue CodeGenFunction::EmitUnaryOpLValue(const UnaryOperator *E) {
|
|
// __extension__ doesn't affect lvalue-ness.
|
|
if (E->getOpcode() == UO_Extension)
|
|
return EmitLValue(E->getSubExpr());
|
|
|
|
QualType ExprTy = getContext().getCanonicalType(E->getSubExpr()->getType());
|
|
switch (E->getOpcode()) {
|
|
default: llvm_unreachable("Unknown unary operator lvalue!");
|
|
case UO_Deref: {
|
|
QualType T = E->getSubExpr()->getType()->getPointeeType();
|
|
assert(!T.isNull() && "CodeGenFunction::EmitUnaryOpLValue: Illegal type");
|
|
|
|
AlignmentSource AlignSource;
|
|
Address Addr = EmitPointerWithAlignment(E->getSubExpr(), &AlignSource);
|
|
LValue LV = MakeAddrLValue(Addr, T, AlignSource);
|
|
LV.getQuals().setAddressSpace(ExprTy.getAddressSpace());
|
|
|
|
// We should not generate __weak write barrier on indirect reference
|
|
// of a pointer to object; as in void foo (__weak id *param); *param = 0;
|
|
// But, we continue to generate __strong write barrier on indirect write
|
|
// into a pointer to object.
|
|
if (getLangOpts().ObjC1 &&
|
|
getLangOpts().getGC() != LangOptions::NonGC &&
|
|
LV.isObjCWeak())
|
|
LV.setNonGC(!E->isOBJCGCCandidate(getContext()));
|
|
return LV;
|
|
}
|
|
case UO_Real:
|
|
case UO_Imag: {
|
|
LValue LV = EmitLValue(E->getSubExpr());
|
|
assert(LV.isSimple() && "real/imag on non-ordinary l-value");
|
|
|
|
// __real is valid on scalars. This is a faster way of testing that.
|
|
// __imag can only produce an rvalue on scalars.
|
|
if (E->getOpcode() == UO_Real &&
|
|
!LV.getAddress().getElementType()->isStructTy()) {
|
|
assert(E->getSubExpr()->getType()->isArithmeticType());
|
|
return LV;
|
|
}
|
|
|
|
assert(E->getSubExpr()->getType()->isAnyComplexType());
|
|
|
|
Address Component =
|
|
(E->getOpcode() == UO_Real
|
|
? emitAddrOfRealComponent(LV.getAddress(), LV.getType())
|
|
: emitAddrOfImagComponent(LV.getAddress(), LV.getType()));
|
|
return MakeAddrLValue(Component, ExprTy, LV.getAlignmentSource());
|
|
}
|
|
case UO_PreInc:
|
|
case UO_PreDec: {
|
|
LValue LV = EmitLValue(E->getSubExpr());
|
|
bool isInc = E->getOpcode() == UO_PreInc;
|
|
|
|
if (E->getType()->isAnyComplexType())
|
|
EmitComplexPrePostIncDec(E, LV, isInc, true/*isPre*/);
|
|
else
|
|
EmitScalarPrePostIncDec(E, LV, isInc, true/*isPre*/);
|
|
return LV;
|
|
}
|
|
}
|
|
}
|
|
|
|
LValue CodeGenFunction::EmitStringLiteralLValue(const StringLiteral *E) {
|
|
return MakeAddrLValue(CGM.GetAddrOfConstantStringFromLiteral(E),
|
|
E->getType(), AlignmentSource::Decl);
|
|
}
|
|
|
|
LValue CodeGenFunction::EmitObjCEncodeExprLValue(const ObjCEncodeExpr *E) {
|
|
return MakeAddrLValue(CGM.GetAddrOfConstantStringFromObjCEncode(E),
|
|
E->getType(), AlignmentSource::Decl);
|
|
}
|
|
|
|
LValue CodeGenFunction::EmitPredefinedLValue(const PredefinedExpr *E) {
|
|
auto SL = E->getFunctionName();
|
|
assert(SL != nullptr && "No StringLiteral name in PredefinedExpr");
|
|
StringRef FnName = CurFn->getName();
|
|
if (FnName.startswith("\01"))
|
|
FnName = FnName.substr(1);
|
|
StringRef NameItems[] = {
|
|
PredefinedExpr::getIdentTypeName(E->getIdentType()), FnName};
|
|
std::string GVName = llvm::join(NameItems, NameItems + 2, ".");
|
|
if (CurCodeDecl && isa<BlockDecl>(CurCodeDecl)) {
|
|
auto C = CGM.GetAddrOfConstantCString(FnName, GVName.c_str());
|
|
return MakeAddrLValue(C, E->getType(), AlignmentSource::Decl);
|
|
}
|
|
auto C = CGM.GetAddrOfConstantStringFromLiteral(SL, GVName);
|
|
return MakeAddrLValue(C, E->getType(), AlignmentSource::Decl);
|
|
}
|
|
|
|
/// Emit a type description suitable for use by a runtime sanitizer library. The
|
|
/// format of a type descriptor is
|
|
///
|
|
/// \code
|
|
/// { i16 TypeKind, i16 TypeInfo }
|
|
/// \endcode
|
|
///
|
|
/// followed by an array of i8 containing the type name. TypeKind is 0 for an
|
|
/// integer, 1 for a floating point value, and -1 for anything else.
|
|
llvm::Constant *CodeGenFunction::EmitCheckTypeDescriptor(QualType T) {
|
|
// Only emit each type's descriptor once.
|
|
if (llvm::Constant *C = CGM.getTypeDescriptorFromMap(T))
|
|
return C;
|
|
|
|
uint16_t TypeKind = -1;
|
|
uint16_t TypeInfo = 0;
|
|
|
|
if (T->isIntegerType()) {
|
|
TypeKind = 0;
|
|
TypeInfo = (llvm::Log2_32(getContext().getTypeSize(T)) << 1) |
|
|
(T->isSignedIntegerType() ? 1 : 0);
|
|
} else if (T->isFloatingType()) {
|
|
TypeKind = 1;
|
|
TypeInfo = getContext().getTypeSize(T);
|
|
}
|
|
|
|
// Format the type name as if for a diagnostic, including quotes and
|
|
// optionally an 'aka'.
|
|
SmallString<32> Buffer;
|
|
CGM.getDiags().ConvertArgToString(DiagnosticsEngine::ak_qualtype,
|
|
(intptr_t)T.getAsOpaquePtr(),
|
|
StringRef(), StringRef(), None, Buffer,
|
|
None);
|
|
|
|
llvm::Constant *Components[] = {
|
|
Builder.getInt16(TypeKind), Builder.getInt16(TypeInfo),
|
|
llvm::ConstantDataArray::getString(getLLVMContext(), Buffer)
|
|
};
|
|
llvm::Constant *Descriptor = llvm::ConstantStruct::getAnon(Components);
|
|
|
|
auto *GV = new llvm::GlobalVariable(
|
|
CGM.getModule(), Descriptor->getType(),
|
|
/*isConstant=*/true, llvm::GlobalVariable::PrivateLinkage, Descriptor);
|
|
GV->setUnnamedAddr(llvm::GlobalValue::UnnamedAddr::Global);
|
|
CGM.getSanitizerMetadata()->disableSanitizerForGlobal(GV);
|
|
|
|
// Remember the descriptor for this type.
|
|
CGM.setTypeDescriptorInMap(T, GV);
|
|
|
|
return GV;
|
|
}
|
|
|
|
llvm::Value *CodeGenFunction::EmitCheckValue(llvm::Value *V) {
|
|
llvm::Type *TargetTy = IntPtrTy;
|
|
|
|
// Floating-point types which fit into intptr_t are bitcast to integers
|
|
// and then passed directly (after zero-extension, if necessary).
|
|
if (V->getType()->isFloatingPointTy()) {
|
|
unsigned Bits = V->getType()->getPrimitiveSizeInBits();
|
|
if (Bits <= TargetTy->getIntegerBitWidth())
|
|
V = Builder.CreateBitCast(V, llvm::Type::getIntNTy(getLLVMContext(),
|
|
Bits));
|
|
}
|
|
|
|
// Integers which fit in intptr_t are zero-extended and passed directly.
|
|
if (V->getType()->isIntegerTy() &&
|
|
V->getType()->getIntegerBitWidth() <= TargetTy->getIntegerBitWidth())
|
|
return Builder.CreateZExt(V, TargetTy);
|
|
|
|
// Pointers are passed directly, everything else is passed by address.
|
|
if (!V->getType()->isPointerTy()) {
|
|
Address Ptr = CreateDefaultAlignTempAlloca(V->getType());
|
|
Builder.CreateStore(V, Ptr);
|
|
V = Ptr.getPointer();
|
|
}
|
|
return Builder.CreatePtrToInt(V, TargetTy);
|
|
}
|
|
|
|
/// \brief Emit a representation of a SourceLocation for passing to a handler
|
|
/// in a sanitizer runtime library. The format for this data is:
|
|
/// \code
|
|
/// struct SourceLocation {
|
|
/// const char *Filename;
|
|
/// int32_t Line, Column;
|
|
/// };
|
|
/// \endcode
|
|
/// For an invalid SourceLocation, the Filename pointer is null.
|
|
llvm::Constant *CodeGenFunction::EmitCheckSourceLocation(SourceLocation Loc) {
|
|
llvm::Constant *Filename;
|
|
int Line, Column;
|
|
|
|
PresumedLoc PLoc = getContext().getSourceManager().getPresumedLoc(Loc);
|
|
if (PLoc.isValid()) {
|
|
StringRef FilenameString = PLoc.getFilename();
|
|
|
|
int PathComponentsToStrip =
|
|
CGM.getCodeGenOpts().EmitCheckPathComponentsToStrip;
|
|
if (PathComponentsToStrip < 0) {
|
|
assert(PathComponentsToStrip != INT_MIN);
|
|
int PathComponentsToKeep = -PathComponentsToStrip;
|
|
auto I = llvm::sys::path::rbegin(FilenameString);
|
|
auto E = llvm::sys::path::rend(FilenameString);
|
|
while (I != E && --PathComponentsToKeep)
|
|
++I;
|
|
|
|
FilenameString = FilenameString.substr(I - E);
|
|
} else if (PathComponentsToStrip > 0) {
|
|
auto I = llvm::sys::path::begin(FilenameString);
|
|
auto E = llvm::sys::path::end(FilenameString);
|
|
while (I != E && PathComponentsToStrip--)
|
|
++I;
|
|
|
|
if (I != E)
|
|
FilenameString =
|
|
FilenameString.substr(I - llvm::sys::path::begin(FilenameString));
|
|
else
|
|
FilenameString = llvm::sys::path::filename(FilenameString);
|
|
}
|
|
|
|
auto FilenameGV = CGM.GetAddrOfConstantCString(FilenameString, ".src");
|
|
CGM.getSanitizerMetadata()->disableSanitizerForGlobal(
|
|
cast<llvm::GlobalVariable>(FilenameGV.getPointer()));
|
|
Filename = FilenameGV.getPointer();
|
|
Line = PLoc.getLine();
|
|
Column = PLoc.getColumn();
|
|
} else {
|
|
Filename = llvm::Constant::getNullValue(Int8PtrTy);
|
|
Line = Column = 0;
|
|
}
|
|
|
|
llvm::Constant *Data[] = {Filename, Builder.getInt32(Line),
|
|
Builder.getInt32(Column)};
|
|
|
|
return llvm::ConstantStruct::getAnon(Data);
|
|
}
|
|
|
|
namespace {
|
|
/// \brief Specify under what conditions this check can be recovered
|
|
enum class CheckRecoverableKind {
|
|
/// Always terminate program execution if this check fails.
|
|
Unrecoverable,
|
|
/// Check supports recovering, runtime has both fatal (noreturn) and
|
|
/// non-fatal handlers for this check.
|
|
Recoverable,
|
|
/// Runtime conditionally aborts, always need to support recovery.
|
|
AlwaysRecoverable
|
|
};
|
|
}
|
|
|
|
static CheckRecoverableKind getRecoverableKind(SanitizerMask Kind) {
|
|
assert(llvm::countPopulation(Kind) == 1);
|
|
switch (Kind) {
|
|
case SanitizerKind::Vptr:
|
|
return CheckRecoverableKind::AlwaysRecoverable;
|
|
case SanitizerKind::Return:
|
|
case SanitizerKind::Unreachable:
|
|
return CheckRecoverableKind::Unrecoverable;
|
|
default:
|
|
return CheckRecoverableKind::Recoverable;
|
|
}
|
|
}
|
|
|
|
static void emitCheckHandlerCall(CodeGenFunction &CGF,
|
|
llvm::FunctionType *FnType,
|
|
ArrayRef<llvm::Value *> FnArgs,
|
|
StringRef CheckName,
|
|
CheckRecoverableKind RecoverKind, bool IsFatal,
|
|
llvm::BasicBlock *ContBB) {
|
|
assert(IsFatal || RecoverKind != CheckRecoverableKind::Unrecoverable);
|
|
bool NeedsAbortSuffix =
|
|
IsFatal && RecoverKind != CheckRecoverableKind::Unrecoverable;
|
|
std::string FnName = ("__ubsan_handle_" + CheckName +
|
|
(NeedsAbortSuffix ? "_abort" : "")).str();
|
|
bool MayReturn =
|
|
!IsFatal || RecoverKind == CheckRecoverableKind::AlwaysRecoverable;
|
|
|
|
llvm::AttrBuilder B;
|
|
if (!MayReturn) {
|
|
B.addAttribute(llvm::Attribute::NoReturn)
|
|
.addAttribute(llvm::Attribute::NoUnwind);
|
|
}
|
|
B.addAttribute(llvm::Attribute::UWTable);
|
|
|
|
llvm::Value *Fn = CGF.CGM.CreateRuntimeFunction(
|
|
FnType, FnName,
|
|
llvm::AttributeSet::get(CGF.getLLVMContext(),
|
|
llvm::AttributeSet::FunctionIndex, B));
|
|
llvm::CallInst *HandlerCall = CGF.EmitNounwindRuntimeCall(Fn, FnArgs);
|
|
if (!MayReturn) {
|
|
HandlerCall->setDoesNotReturn();
|
|
CGF.Builder.CreateUnreachable();
|
|
} else {
|
|
CGF.Builder.CreateBr(ContBB);
|
|
}
|
|
}
|
|
|
|
void CodeGenFunction::EmitCheck(
|
|
ArrayRef<std::pair<llvm::Value *, SanitizerMask>> Checked,
|
|
StringRef CheckName, ArrayRef<llvm::Constant *> StaticArgs,
|
|
ArrayRef<llvm::Value *> DynamicArgs) {
|
|
assert(IsSanitizerScope);
|
|
assert(Checked.size() > 0);
|
|
|
|
llvm::Value *FatalCond = nullptr;
|
|
llvm::Value *RecoverableCond = nullptr;
|
|
llvm::Value *TrapCond = nullptr;
|
|
for (int i = 0, n = Checked.size(); i < n; ++i) {
|
|
llvm::Value *Check = Checked[i].first;
|
|
// -fsanitize-trap= overrides -fsanitize-recover=.
|
|
llvm::Value *&Cond =
|
|
CGM.getCodeGenOpts().SanitizeTrap.has(Checked[i].second)
|
|
? TrapCond
|
|
: CGM.getCodeGenOpts().SanitizeRecover.has(Checked[i].second)
|
|
? RecoverableCond
|
|
: FatalCond;
|
|
Cond = Cond ? Builder.CreateAnd(Cond, Check) : Check;
|
|
}
|
|
|
|
if (TrapCond)
|
|
EmitTrapCheck(TrapCond);
|
|
if (!FatalCond && !RecoverableCond)
|
|
return;
|
|
|
|
llvm::Value *JointCond;
|
|
if (FatalCond && RecoverableCond)
|
|
JointCond = Builder.CreateAnd(FatalCond, RecoverableCond);
|
|
else
|
|
JointCond = FatalCond ? FatalCond : RecoverableCond;
|
|
assert(JointCond);
|
|
|
|
CheckRecoverableKind RecoverKind = getRecoverableKind(Checked[0].second);
|
|
assert(SanOpts.has(Checked[0].second));
|
|
#ifndef NDEBUG
|
|
for (int i = 1, n = Checked.size(); i < n; ++i) {
|
|
assert(RecoverKind == getRecoverableKind(Checked[i].second) &&
|
|
"All recoverable kinds in a single check must be same!");
|
|
assert(SanOpts.has(Checked[i].second));
|
|
}
|
|
#endif
|
|
|
|
llvm::BasicBlock *Cont = createBasicBlock("cont");
|
|
llvm::BasicBlock *Handlers = createBasicBlock("handler." + CheckName);
|
|
llvm::Instruction *Branch = Builder.CreateCondBr(JointCond, Cont, Handlers);
|
|
// Give hint that we very much don't expect to execute the handler
|
|
// Value chosen to match UR_NONTAKEN_WEIGHT, see BranchProbabilityInfo.cpp
|
|
llvm::MDBuilder MDHelper(getLLVMContext());
|
|
llvm::MDNode *Node = MDHelper.createBranchWeights((1U << 20) - 1, 1);
|
|
Branch->setMetadata(llvm::LLVMContext::MD_prof, Node);
|
|
EmitBlock(Handlers);
|
|
|
|
// Handler functions take an i8* pointing to the (handler-specific) static
|
|
// information block, followed by a sequence of intptr_t arguments
|
|
// representing operand values.
|
|
SmallVector<llvm::Value *, 4> Args;
|
|
SmallVector<llvm::Type *, 4> ArgTypes;
|
|
Args.reserve(DynamicArgs.size() + 1);
|
|
ArgTypes.reserve(DynamicArgs.size() + 1);
|
|
|
|
// Emit handler arguments and create handler function type.
|
|
if (!StaticArgs.empty()) {
|
|
llvm::Constant *Info = llvm::ConstantStruct::getAnon(StaticArgs);
|
|
auto *InfoPtr =
|
|
new llvm::GlobalVariable(CGM.getModule(), Info->getType(), false,
|
|
llvm::GlobalVariable::PrivateLinkage, Info);
|
|
InfoPtr->setUnnamedAddr(llvm::GlobalValue::UnnamedAddr::Global);
|
|
CGM.getSanitizerMetadata()->disableSanitizerForGlobal(InfoPtr);
|
|
Args.push_back(Builder.CreateBitCast(InfoPtr, Int8PtrTy));
|
|
ArgTypes.push_back(Int8PtrTy);
|
|
}
|
|
|
|
for (size_t i = 0, n = DynamicArgs.size(); i != n; ++i) {
|
|
Args.push_back(EmitCheckValue(DynamicArgs[i]));
|
|
ArgTypes.push_back(IntPtrTy);
|
|
}
|
|
|
|
llvm::FunctionType *FnType =
|
|
llvm::FunctionType::get(CGM.VoidTy, ArgTypes, false);
|
|
|
|
if (!FatalCond || !RecoverableCond) {
|
|
// Simple case: we need to generate a single handler call, either
|
|
// fatal, or non-fatal.
|
|
emitCheckHandlerCall(*this, FnType, Args, CheckName, RecoverKind,
|
|
(FatalCond != nullptr), Cont);
|
|
} else {
|
|
// Emit two handler calls: first one for set of unrecoverable checks,
|
|
// another one for recoverable.
|
|
llvm::BasicBlock *NonFatalHandlerBB =
|
|
createBasicBlock("non_fatal." + CheckName);
|
|
llvm::BasicBlock *FatalHandlerBB = createBasicBlock("fatal." + CheckName);
|
|
Builder.CreateCondBr(FatalCond, NonFatalHandlerBB, FatalHandlerBB);
|
|
EmitBlock(FatalHandlerBB);
|
|
emitCheckHandlerCall(*this, FnType, Args, CheckName, RecoverKind, true,
|
|
NonFatalHandlerBB);
|
|
EmitBlock(NonFatalHandlerBB);
|
|
emitCheckHandlerCall(*this, FnType, Args, CheckName, RecoverKind, false,
|
|
Cont);
|
|
}
|
|
|
|
EmitBlock(Cont);
|
|
}
|
|
|
|
void CodeGenFunction::EmitCfiSlowPathCheck(
|
|
SanitizerMask Kind, llvm::Value *Cond, llvm::ConstantInt *TypeId,
|
|
llvm::Value *Ptr, ArrayRef<llvm::Constant *> StaticArgs) {
|
|
llvm::BasicBlock *Cont = createBasicBlock("cfi.cont");
|
|
|
|
llvm::BasicBlock *CheckBB = createBasicBlock("cfi.slowpath");
|
|
llvm::BranchInst *BI = Builder.CreateCondBr(Cond, Cont, CheckBB);
|
|
|
|
llvm::MDBuilder MDHelper(getLLVMContext());
|
|
llvm::MDNode *Node = MDHelper.createBranchWeights((1U << 20) - 1, 1);
|
|
BI->setMetadata(llvm::LLVMContext::MD_prof, Node);
|
|
|
|
EmitBlock(CheckBB);
|
|
|
|
bool WithDiag = !CGM.getCodeGenOpts().SanitizeTrap.has(Kind);
|
|
|
|
llvm::CallInst *CheckCall;
|
|
if (WithDiag) {
|
|
llvm::Constant *Info = llvm::ConstantStruct::getAnon(StaticArgs);
|
|
auto *InfoPtr =
|
|
new llvm::GlobalVariable(CGM.getModule(), Info->getType(), false,
|
|
llvm::GlobalVariable::PrivateLinkage, Info);
|
|
InfoPtr->setUnnamedAddr(llvm::GlobalValue::UnnamedAddr::Global);
|
|
CGM.getSanitizerMetadata()->disableSanitizerForGlobal(InfoPtr);
|
|
|
|
llvm::Constant *SlowPathDiagFn = CGM.getModule().getOrInsertFunction(
|
|
"__cfi_slowpath_diag",
|
|
llvm::FunctionType::get(VoidTy, {Int64Ty, Int8PtrTy, Int8PtrTy},
|
|
false));
|
|
CheckCall = Builder.CreateCall(
|
|
SlowPathDiagFn,
|
|
{TypeId, Ptr, Builder.CreateBitCast(InfoPtr, Int8PtrTy)});
|
|
} else {
|
|
llvm::Constant *SlowPathFn = CGM.getModule().getOrInsertFunction(
|
|
"__cfi_slowpath",
|
|
llvm::FunctionType::get(VoidTy, {Int64Ty, Int8PtrTy}, false));
|
|
CheckCall = Builder.CreateCall(SlowPathFn, {TypeId, Ptr});
|
|
}
|
|
|
|
CheckCall->setDoesNotThrow();
|
|
|
|
EmitBlock(Cont);
|
|
}
|
|
|
|
// This function is basically a switch over the CFI failure kind, which is
|
|
// extracted from CFICheckFailData (1st function argument). Each case is either
|
|
// llvm.trap or a call to one of the two runtime handlers, based on
|
|
// -fsanitize-trap and -fsanitize-recover settings. Default case (invalid
|
|
// failure kind) traps, but this should really never happen. CFICheckFailData
|
|
// can be nullptr if the calling module has -fsanitize-trap behavior for this
|
|
// check kind; in this case __cfi_check_fail traps as well.
|
|
void CodeGenFunction::EmitCfiCheckFail() {
|
|
SanitizerScope SanScope(this);
|
|
FunctionArgList Args;
|
|
ImplicitParamDecl ArgData(getContext(), nullptr, SourceLocation(), nullptr,
|
|
getContext().VoidPtrTy);
|
|
ImplicitParamDecl ArgAddr(getContext(), nullptr, SourceLocation(), nullptr,
|
|
getContext().VoidPtrTy);
|
|
Args.push_back(&ArgData);
|
|
Args.push_back(&ArgAddr);
|
|
|
|
const CGFunctionInfo &FI =
|
|
CGM.getTypes().arrangeBuiltinFunctionDeclaration(getContext().VoidTy, Args);
|
|
|
|
llvm::Function *F = llvm::Function::Create(
|
|
llvm::FunctionType::get(VoidTy, {VoidPtrTy, VoidPtrTy}, false),
|
|
llvm::GlobalValue::WeakODRLinkage, "__cfi_check_fail", &CGM.getModule());
|
|
F->setVisibility(llvm::GlobalValue::HiddenVisibility);
|
|
|
|
StartFunction(GlobalDecl(), CGM.getContext().VoidTy, F, FI, Args,
|
|
SourceLocation());
|
|
|
|
llvm::Value *Data =
|
|
EmitLoadOfScalar(GetAddrOfLocalVar(&ArgData), /*Volatile=*/false,
|
|
CGM.getContext().VoidPtrTy, ArgData.getLocation());
|
|
llvm::Value *Addr =
|
|
EmitLoadOfScalar(GetAddrOfLocalVar(&ArgAddr), /*Volatile=*/false,
|
|
CGM.getContext().VoidPtrTy, ArgAddr.getLocation());
|
|
|
|
// Data == nullptr means the calling module has trap behaviour for this check.
|
|
llvm::Value *DataIsNotNullPtr =
|
|
Builder.CreateICmpNE(Data, llvm::ConstantPointerNull::get(Int8PtrTy));
|
|
EmitTrapCheck(DataIsNotNullPtr);
|
|
|
|
llvm::StructType *SourceLocationTy =
|
|
llvm::StructType::get(VoidPtrTy, Int32Ty, Int32Ty, nullptr);
|
|
llvm::StructType *CfiCheckFailDataTy =
|
|
llvm::StructType::get(Int8Ty, SourceLocationTy, VoidPtrTy, nullptr);
|
|
|
|
llvm::Value *V = Builder.CreateConstGEP2_32(
|
|
CfiCheckFailDataTy,
|
|
Builder.CreatePointerCast(Data, CfiCheckFailDataTy->getPointerTo(0)), 0,
|
|
0);
|
|
Address CheckKindAddr(V, getIntAlign());
|
|
llvm::Value *CheckKind = Builder.CreateLoad(CheckKindAddr);
|
|
|
|
llvm::Value *AllVtables = llvm::MetadataAsValue::get(
|
|
CGM.getLLVMContext(),
|
|
llvm::MDString::get(CGM.getLLVMContext(), "all-vtables"));
|
|
llvm::Value *ValidVtable = Builder.CreateZExt(
|
|
Builder.CreateCall(CGM.getIntrinsic(llvm::Intrinsic::type_test),
|
|
{Addr, AllVtables}),
|
|
IntPtrTy);
|
|
|
|
const std::pair<int, SanitizerMask> CheckKinds[] = {
|
|
{CFITCK_VCall, SanitizerKind::CFIVCall},
|
|
{CFITCK_NVCall, SanitizerKind::CFINVCall},
|
|
{CFITCK_DerivedCast, SanitizerKind::CFIDerivedCast},
|
|
{CFITCK_UnrelatedCast, SanitizerKind::CFIUnrelatedCast},
|
|
{CFITCK_ICall, SanitizerKind::CFIICall}};
|
|
|
|
SmallVector<std::pair<llvm::Value *, SanitizerMask>, 5> Checks;
|
|
for (auto CheckKindMaskPair : CheckKinds) {
|
|
int Kind = CheckKindMaskPair.first;
|
|
SanitizerMask Mask = CheckKindMaskPair.second;
|
|
llvm::Value *Cond =
|
|
Builder.CreateICmpNE(CheckKind, llvm::ConstantInt::get(Int8Ty, Kind));
|
|
if (CGM.getLangOpts().Sanitize.has(Mask))
|
|
EmitCheck(std::make_pair(Cond, Mask), "cfi_check_fail", {},
|
|
{Data, Addr, ValidVtable});
|
|
else
|
|
EmitTrapCheck(Cond);
|
|
}
|
|
|
|
FinishFunction();
|
|
// The only reference to this function will be created during LTO link.
|
|
// Make sure it survives until then.
|
|
CGM.addUsedGlobal(F);
|
|
}
|
|
|
|
void CodeGenFunction::EmitTrapCheck(llvm::Value *Checked) {
|
|
llvm::BasicBlock *Cont = createBasicBlock("cont");
|
|
|
|
// If we're optimizing, collapse all calls to trap down to just one per
|
|
// function to save on code size.
|
|
if (!CGM.getCodeGenOpts().OptimizationLevel || !TrapBB) {
|
|
TrapBB = createBasicBlock("trap");
|
|
Builder.CreateCondBr(Checked, Cont, TrapBB);
|
|
EmitBlock(TrapBB);
|
|
llvm::CallInst *TrapCall = EmitTrapCall(llvm::Intrinsic::trap);
|
|
TrapCall->setDoesNotReturn();
|
|
TrapCall->setDoesNotThrow();
|
|
Builder.CreateUnreachable();
|
|
} else {
|
|
Builder.CreateCondBr(Checked, Cont, TrapBB);
|
|
}
|
|
|
|
EmitBlock(Cont);
|
|
}
|
|
|
|
llvm::CallInst *CodeGenFunction::EmitTrapCall(llvm::Intrinsic::ID IntrID) {
|
|
llvm::CallInst *TrapCall = Builder.CreateCall(CGM.getIntrinsic(IntrID));
|
|
|
|
if (!CGM.getCodeGenOpts().TrapFuncName.empty())
|
|
TrapCall->addAttribute(llvm::AttributeSet::FunctionIndex,
|
|
"trap-func-name",
|
|
CGM.getCodeGenOpts().TrapFuncName);
|
|
|
|
return TrapCall;
|
|
}
|
|
|
|
Address CodeGenFunction::EmitArrayToPointerDecay(const Expr *E,
|
|
AlignmentSource *AlignSource) {
|
|
assert(E->getType()->isArrayType() &&
|
|
"Array to pointer decay must have array source type!");
|
|
|
|
// Expressions of array type can't be bitfields or vector elements.
|
|
LValue LV = EmitLValue(E);
|
|
Address Addr = LV.getAddress();
|
|
if (AlignSource) *AlignSource = LV.getAlignmentSource();
|
|
|
|
// If the array type was an incomplete type, we need to make sure
|
|
// the decay ends up being the right type.
|
|
llvm::Type *NewTy = ConvertType(E->getType());
|
|
Addr = Builder.CreateElementBitCast(Addr, NewTy);
|
|
|
|
// Note that VLA pointers are always decayed, so we don't need to do
|
|
// anything here.
|
|
if (!E->getType()->isVariableArrayType()) {
|
|
assert(isa<llvm::ArrayType>(Addr.getElementType()) &&
|
|
"Expected pointer to array");
|
|
Addr = Builder.CreateStructGEP(Addr, 0, CharUnits::Zero(), "arraydecay");
|
|
}
|
|
|
|
QualType EltType = E->getType()->castAsArrayTypeUnsafe()->getElementType();
|
|
return Builder.CreateElementBitCast(Addr, ConvertTypeForMem(EltType));
|
|
}
|
|
|
|
/// isSimpleArrayDecayOperand - If the specified expr is a simple decay from an
|
|
/// array to pointer, return the array subexpression.
|
|
static const Expr *isSimpleArrayDecayOperand(const Expr *E) {
|
|
// If this isn't just an array->pointer decay, bail out.
|
|
const auto *CE = dyn_cast<CastExpr>(E);
|
|
if (!CE || CE->getCastKind() != CK_ArrayToPointerDecay)
|
|
return nullptr;
|
|
|
|
// If this is a decay from variable width array, bail out.
|
|
const Expr *SubExpr = CE->getSubExpr();
|
|
if (SubExpr->getType()->isVariableArrayType())
|
|
return nullptr;
|
|
|
|
return SubExpr;
|
|
}
|
|
|
|
static llvm::Value *emitArraySubscriptGEP(CodeGenFunction &CGF,
|
|
llvm::Value *ptr,
|
|
ArrayRef<llvm::Value*> indices,
|
|
bool inbounds,
|
|
const llvm::Twine &name = "arrayidx") {
|
|
if (inbounds) {
|
|
return CGF.Builder.CreateInBoundsGEP(ptr, indices, name);
|
|
} else {
|
|
return CGF.Builder.CreateGEP(ptr, indices, name);
|
|
}
|
|
}
|
|
|
|
static CharUnits getArrayElementAlign(CharUnits arrayAlign,
|
|
llvm::Value *idx,
|
|
CharUnits eltSize) {
|
|
// If we have a constant index, we can use the exact offset of the
|
|
// element we're accessing.
|
|
if (auto constantIdx = dyn_cast<llvm::ConstantInt>(idx)) {
|
|
CharUnits offset = constantIdx->getZExtValue() * eltSize;
|
|
return arrayAlign.alignmentAtOffset(offset);
|
|
|
|
// Otherwise, use the worst-case alignment for any element.
|
|
} else {
|
|
return arrayAlign.alignmentOfArrayElement(eltSize);
|
|
}
|
|
}
|
|
|
|
static QualType getFixedSizeElementType(const ASTContext &ctx,
|
|
const VariableArrayType *vla) {
|
|
QualType eltType;
|
|
do {
|
|
eltType = vla->getElementType();
|
|
} while ((vla = ctx.getAsVariableArrayType(eltType)));
|
|
return eltType;
|
|
}
|
|
|
|
static Address emitArraySubscriptGEP(CodeGenFunction &CGF, Address addr,
|
|
ArrayRef<llvm::Value*> indices,
|
|
QualType eltType, bool inbounds,
|
|
const llvm::Twine &name = "arrayidx") {
|
|
// All the indices except that last must be zero.
|
|
#ifndef NDEBUG
|
|
for (auto idx : indices.drop_back())
|
|
assert(isa<llvm::ConstantInt>(idx) &&
|
|
cast<llvm::ConstantInt>(idx)->isZero());
|
|
#endif
|
|
|
|
// Determine the element size of the statically-sized base. This is
|
|
// the thing that the indices are expressed in terms of.
|
|
if (auto vla = CGF.getContext().getAsVariableArrayType(eltType)) {
|
|
eltType = getFixedSizeElementType(CGF.getContext(), vla);
|
|
}
|
|
|
|
// We can use that to compute the best alignment of the element.
|
|
CharUnits eltSize = CGF.getContext().getTypeSizeInChars(eltType);
|
|
CharUnits eltAlign =
|
|
getArrayElementAlign(addr.getAlignment(), indices.back(), eltSize);
|
|
|
|
llvm::Value *eltPtr =
|
|
emitArraySubscriptGEP(CGF, addr.getPointer(), indices, inbounds, name);
|
|
return Address(eltPtr, eltAlign);
|
|
}
|
|
|
|
LValue CodeGenFunction::EmitArraySubscriptExpr(const ArraySubscriptExpr *E,
|
|
bool Accessed) {
|
|
// The index must always be an integer, which is not an aggregate. Emit it.
|
|
llvm::Value *Idx = EmitScalarExpr(E->getIdx());
|
|
QualType IdxTy = E->getIdx()->getType();
|
|
bool IdxSigned = IdxTy->isSignedIntegerOrEnumerationType();
|
|
|
|
if (SanOpts.has(SanitizerKind::ArrayBounds))
|
|
EmitBoundsCheck(E, E->getBase(), Idx, IdxTy, Accessed);
|
|
|
|
// If the base is a vector type, then we are forming a vector element lvalue
|
|
// with this subscript.
|
|
if (E->getBase()->getType()->isVectorType() &&
|
|
!isa<ExtVectorElementExpr>(E->getBase())) {
|
|
// Emit the vector as an lvalue to get its address.
|
|
LValue LHS = EmitLValue(E->getBase());
|
|
assert(LHS.isSimple() && "Can only subscript lvalue vectors here!");
|
|
return LValue::MakeVectorElt(LHS.getAddress(), Idx,
|
|
E->getBase()->getType(),
|
|
LHS.getAlignmentSource());
|
|
}
|
|
|
|
// All the other cases basically behave like simple offsetting.
|
|
|
|
// Extend or truncate the index type to 32 or 64-bits.
|
|
if (Idx->getType() != IntPtrTy)
|
|
Idx = Builder.CreateIntCast(Idx, IntPtrTy, IdxSigned, "idxprom");
|
|
|
|
// Handle the extvector case we ignored above.
|
|
if (isa<ExtVectorElementExpr>(E->getBase())) {
|
|
LValue LV = EmitLValue(E->getBase());
|
|
Address Addr = EmitExtVectorElementLValue(LV);
|
|
|
|
QualType EltType = LV.getType()->castAs<VectorType>()->getElementType();
|
|
Addr = emitArraySubscriptGEP(*this, Addr, Idx, EltType, /*inbounds*/ true);
|
|
return MakeAddrLValue(Addr, EltType, LV.getAlignmentSource());
|
|
}
|
|
|
|
AlignmentSource AlignSource;
|
|
Address Addr = Address::invalid();
|
|
if (const VariableArrayType *vla =
|
|
getContext().getAsVariableArrayType(E->getType())) {
|
|
// The base must be a pointer, which is not an aggregate. Emit
|
|
// it. It needs to be emitted first in case it's what captures
|
|
// the VLA bounds.
|
|
Addr = EmitPointerWithAlignment(E->getBase(), &AlignSource);
|
|
|
|
// The element count here is the total number of non-VLA elements.
|
|
llvm::Value *numElements = getVLASize(vla).first;
|
|
|
|
// Effectively, the multiply by the VLA size is part of the GEP.
|
|
// GEP indexes are signed, and scaling an index isn't permitted to
|
|
// signed-overflow, so we use the same semantics for our explicit
|
|
// multiply. We suppress this if overflow is not undefined behavior.
|
|
if (getLangOpts().isSignedOverflowDefined()) {
|
|
Idx = Builder.CreateMul(Idx, numElements);
|
|
} else {
|
|
Idx = Builder.CreateNSWMul(Idx, numElements);
|
|
}
|
|
|
|
Addr = emitArraySubscriptGEP(*this, Addr, Idx, vla->getElementType(),
|
|
!getLangOpts().isSignedOverflowDefined());
|
|
|
|
} else if (const ObjCObjectType *OIT = E->getType()->getAs<ObjCObjectType>()){
|
|
// Indexing over an interface, as in "NSString *P; P[4];"
|
|
CharUnits InterfaceSize = getContext().getTypeSizeInChars(OIT);
|
|
llvm::Value *InterfaceSizeVal =
|
|
llvm::ConstantInt::get(Idx->getType(), InterfaceSize.getQuantity());;
|
|
|
|
llvm::Value *ScaledIdx = Builder.CreateMul(Idx, InterfaceSizeVal);
|
|
|
|
// Emit the base pointer.
|
|
Addr = EmitPointerWithAlignment(E->getBase(), &AlignSource);
|
|
|
|
// We don't necessarily build correct LLVM struct types for ObjC
|
|
// interfaces, so we can't rely on GEP to do this scaling
|
|
// correctly, so we need to cast to i8*. FIXME: is this actually
|
|
// true? A lot of other things in the fragile ABI would break...
|
|
llvm::Type *OrigBaseTy = Addr.getType();
|
|
Addr = Builder.CreateElementBitCast(Addr, Int8Ty);
|
|
|
|
// Do the GEP.
|
|
CharUnits EltAlign =
|
|
getArrayElementAlign(Addr.getAlignment(), Idx, InterfaceSize);
|
|
llvm::Value *EltPtr =
|
|
emitArraySubscriptGEP(*this, Addr.getPointer(), ScaledIdx, false);
|
|
Addr = Address(EltPtr, EltAlign);
|
|
|
|
// Cast back.
|
|
Addr = Builder.CreateBitCast(Addr, OrigBaseTy);
|
|
} else if (const Expr *Array = isSimpleArrayDecayOperand(E->getBase())) {
|
|
// If this is A[i] where A is an array, the frontend will have decayed the
|
|
// base to be a ArrayToPointerDecay implicit cast. While correct, it is
|
|
// inefficient at -O0 to emit a "gep A, 0, 0" when codegen'ing it, then a
|
|
// "gep x, i" here. Emit one "gep A, 0, i".
|
|
assert(Array->getType()->isArrayType() &&
|
|
"Array to pointer decay must have array source type!");
|
|
LValue ArrayLV;
|
|
// For simple multidimensional array indexing, set the 'accessed' flag for
|
|
// better bounds-checking of the base expression.
|
|
if (const auto *ASE = dyn_cast<ArraySubscriptExpr>(Array))
|
|
ArrayLV = EmitArraySubscriptExpr(ASE, /*Accessed*/ true);
|
|
else
|
|
ArrayLV = EmitLValue(Array);
|
|
|
|
// Propagate the alignment from the array itself to the result.
|
|
Addr = emitArraySubscriptGEP(*this, ArrayLV.getAddress(),
|
|
{CGM.getSize(CharUnits::Zero()), Idx},
|
|
E->getType(),
|
|
!getLangOpts().isSignedOverflowDefined());
|
|
AlignSource = ArrayLV.getAlignmentSource();
|
|
} else {
|
|
// The base must be a pointer; emit it with an estimate of its alignment.
|
|
Addr = EmitPointerWithAlignment(E->getBase(), &AlignSource);
|
|
Addr = emitArraySubscriptGEP(*this, Addr, Idx, E->getType(),
|
|
!getLangOpts().isSignedOverflowDefined());
|
|
}
|
|
|
|
LValue LV = MakeAddrLValue(Addr, E->getType(), AlignSource);
|
|
|
|
// TODO: Preserve/extend path TBAA metadata?
|
|
|
|
if (getLangOpts().ObjC1 &&
|
|
getLangOpts().getGC() != LangOptions::NonGC) {
|
|
LV.setNonGC(!E->isOBJCGCCandidate(getContext()));
|
|
setObjCGCLValueClass(getContext(), E, LV);
|
|
}
|
|
return LV;
|
|
}
|
|
|
|
static Address emitOMPArraySectionBase(CodeGenFunction &CGF, const Expr *Base,
|
|
AlignmentSource &AlignSource,
|
|
QualType BaseTy, QualType ElTy,
|
|
bool IsLowerBound) {
|
|
LValue BaseLVal;
|
|
if (auto *ASE = dyn_cast<OMPArraySectionExpr>(Base->IgnoreParenImpCasts())) {
|
|
BaseLVal = CGF.EmitOMPArraySectionExpr(ASE, IsLowerBound);
|
|
if (BaseTy->isArrayType()) {
|
|
Address Addr = BaseLVal.getAddress();
|
|
AlignSource = BaseLVal.getAlignmentSource();
|
|
|
|
// If the array type was an incomplete type, we need to make sure
|
|
// the decay ends up being the right type.
|
|
llvm::Type *NewTy = CGF.ConvertType(BaseTy);
|
|
Addr = CGF.Builder.CreateElementBitCast(Addr, NewTy);
|
|
|
|
// Note that VLA pointers are always decayed, so we don't need to do
|
|
// anything here.
|
|
if (!BaseTy->isVariableArrayType()) {
|
|
assert(isa<llvm::ArrayType>(Addr.getElementType()) &&
|
|
"Expected pointer to array");
|
|
Addr = CGF.Builder.CreateStructGEP(Addr, 0, CharUnits::Zero(),
|
|
"arraydecay");
|
|
}
|
|
|
|
return CGF.Builder.CreateElementBitCast(Addr,
|
|
CGF.ConvertTypeForMem(ElTy));
|
|
}
|
|
CharUnits Align = CGF.getNaturalTypeAlignment(ElTy, &AlignSource);
|
|
return Address(CGF.Builder.CreateLoad(BaseLVal.getAddress()), Align);
|
|
}
|
|
return CGF.EmitPointerWithAlignment(Base, &AlignSource);
|
|
}
|
|
|
|
LValue CodeGenFunction::EmitOMPArraySectionExpr(const OMPArraySectionExpr *E,
|
|
bool IsLowerBound) {
|
|
QualType BaseTy;
|
|
if (auto *ASE =
|
|
dyn_cast<OMPArraySectionExpr>(E->getBase()->IgnoreParenImpCasts()))
|
|
BaseTy = OMPArraySectionExpr::getBaseOriginalType(ASE);
|
|
else
|
|
BaseTy = E->getBase()->getType();
|
|
QualType ResultExprTy;
|
|
if (auto *AT = getContext().getAsArrayType(BaseTy))
|
|
ResultExprTy = AT->getElementType();
|
|
else
|
|
ResultExprTy = BaseTy->getPointeeType();
|
|
llvm::Value *Idx = nullptr;
|
|
if (IsLowerBound || E->getColonLoc().isInvalid()) {
|
|
// Requesting lower bound or upper bound, but without provided length and
|
|
// without ':' symbol for the default length -> length = 1.
|
|
// Idx = LowerBound ?: 0;
|
|
if (auto *LowerBound = E->getLowerBound()) {
|
|
Idx = Builder.CreateIntCast(
|
|
EmitScalarExpr(LowerBound), IntPtrTy,
|
|
LowerBound->getType()->hasSignedIntegerRepresentation());
|
|
} else
|
|
Idx = llvm::ConstantInt::getNullValue(IntPtrTy);
|
|
} else {
|
|
// Try to emit length or lower bound as constant. If this is possible, 1
|
|
// is subtracted from constant length or lower bound. Otherwise, emit LLVM
|
|
// IR (LB + Len) - 1.
|
|
auto &C = CGM.getContext();
|
|
auto *Length = E->getLength();
|
|
llvm::APSInt ConstLength;
|
|
if (Length) {
|
|
// Idx = LowerBound + Length - 1;
|
|
if (Length->isIntegerConstantExpr(ConstLength, C)) {
|
|
ConstLength = ConstLength.zextOrTrunc(PointerWidthInBits);
|
|
Length = nullptr;
|
|
}
|
|
auto *LowerBound = E->getLowerBound();
|
|
llvm::APSInt ConstLowerBound(PointerWidthInBits, /*isUnsigned=*/false);
|
|
if (LowerBound && LowerBound->isIntegerConstantExpr(ConstLowerBound, C)) {
|
|
ConstLowerBound = ConstLowerBound.zextOrTrunc(PointerWidthInBits);
|
|
LowerBound = nullptr;
|
|
}
|
|
if (!Length)
|
|
--ConstLength;
|
|
else if (!LowerBound)
|
|
--ConstLowerBound;
|
|
|
|
if (Length || LowerBound) {
|
|
auto *LowerBoundVal =
|
|
LowerBound
|
|
? Builder.CreateIntCast(
|
|
EmitScalarExpr(LowerBound), IntPtrTy,
|
|
LowerBound->getType()->hasSignedIntegerRepresentation())
|
|
: llvm::ConstantInt::get(IntPtrTy, ConstLowerBound);
|
|
auto *LengthVal =
|
|
Length
|
|
? Builder.CreateIntCast(
|
|
EmitScalarExpr(Length), IntPtrTy,
|
|
Length->getType()->hasSignedIntegerRepresentation())
|
|
: llvm::ConstantInt::get(IntPtrTy, ConstLength);
|
|
Idx = Builder.CreateAdd(LowerBoundVal, LengthVal, "lb_add_len",
|
|
/*HasNUW=*/false,
|
|
!getLangOpts().isSignedOverflowDefined());
|
|
if (Length && LowerBound) {
|
|
Idx = Builder.CreateSub(
|
|
Idx, llvm::ConstantInt::get(IntPtrTy, /*V=*/1), "idx_sub_1",
|
|
/*HasNUW=*/false, !getLangOpts().isSignedOverflowDefined());
|
|
}
|
|
} else
|
|
Idx = llvm::ConstantInt::get(IntPtrTy, ConstLength + ConstLowerBound);
|
|
} else {
|
|
// Idx = ArraySize - 1;
|
|
QualType ArrayTy = BaseTy->isPointerType()
|
|
? E->getBase()->IgnoreParenImpCasts()->getType()
|
|
: BaseTy;
|
|
if (auto *VAT = C.getAsVariableArrayType(ArrayTy)) {
|
|
Length = VAT->getSizeExpr();
|
|
if (Length->isIntegerConstantExpr(ConstLength, C))
|
|
Length = nullptr;
|
|
} else {
|
|
auto *CAT = C.getAsConstantArrayType(ArrayTy);
|
|
ConstLength = CAT->getSize();
|
|
}
|
|
if (Length) {
|
|
auto *LengthVal = Builder.CreateIntCast(
|
|
EmitScalarExpr(Length), IntPtrTy,
|
|
Length->getType()->hasSignedIntegerRepresentation());
|
|
Idx = Builder.CreateSub(
|
|
LengthVal, llvm::ConstantInt::get(IntPtrTy, /*V=*/1), "len_sub_1",
|
|
/*HasNUW=*/false, !getLangOpts().isSignedOverflowDefined());
|
|
} else {
|
|
ConstLength = ConstLength.zextOrTrunc(PointerWidthInBits);
|
|
--ConstLength;
|
|
Idx = llvm::ConstantInt::get(IntPtrTy, ConstLength);
|
|
}
|
|
}
|
|
}
|
|
assert(Idx);
|
|
|
|
Address EltPtr = Address::invalid();
|
|
AlignmentSource AlignSource;
|
|
if (auto *VLA = getContext().getAsVariableArrayType(ResultExprTy)) {
|
|
// The base must be a pointer, which is not an aggregate. Emit
|
|
// it. It needs to be emitted first in case it's what captures
|
|
// the VLA bounds.
|
|
Address Base =
|
|
emitOMPArraySectionBase(*this, E->getBase(), AlignSource, BaseTy,
|
|
VLA->getElementType(), IsLowerBound);
|
|
// The element count here is the total number of non-VLA elements.
|
|
llvm::Value *NumElements = getVLASize(VLA).first;
|
|
|
|
// Effectively, the multiply by the VLA size is part of the GEP.
|
|
// GEP indexes are signed, and scaling an index isn't permitted to
|
|
// signed-overflow, so we use the same semantics for our explicit
|
|
// multiply. We suppress this if overflow is not undefined behavior.
|
|
if (getLangOpts().isSignedOverflowDefined())
|
|
Idx = Builder.CreateMul(Idx, NumElements);
|
|
else
|
|
Idx = Builder.CreateNSWMul(Idx, NumElements);
|
|
EltPtr = emitArraySubscriptGEP(*this, Base, Idx, VLA->getElementType(),
|
|
!getLangOpts().isSignedOverflowDefined());
|
|
} else if (const Expr *Array = isSimpleArrayDecayOperand(E->getBase())) {
|
|
// If this is A[i] where A is an array, the frontend will have decayed the
|
|
// base to be a ArrayToPointerDecay implicit cast. While correct, it is
|
|
// inefficient at -O0 to emit a "gep A, 0, 0" when codegen'ing it, then a
|
|
// "gep x, i" here. Emit one "gep A, 0, i".
|
|
assert(Array->getType()->isArrayType() &&
|
|
"Array to pointer decay must have array source type!");
|
|
LValue ArrayLV;
|
|
// For simple multidimensional array indexing, set the 'accessed' flag for
|
|
// better bounds-checking of the base expression.
|
|
if (const auto *ASE = dyn_cast<ArraySubscriptExpr>(Array))
|
|
ArrayLV = EmitArraySubscriptExpr(ASE, /*Accessed*/ true);
|
|
else
|
|
ArrayLV = EmitLValue(Array);
|
|
|
|
// Propagate the alignment from the array itself to the result.
|
|
EltPtr = emitArraySubscriptGEP(
|
|
*this, ArrayLV.getAddress(), {CGM.getSize(CharUnits::Zero()), Idx},
|
|
ResultExprTy, !getLangOpts().isSignedOverflowDefined());
|
|
AlignSource = ArrayLV.getAlignmentSource();
|
|
} else {
|
|
Address Base = emitOMPArraySectionBase(*this, E->getBase(), AlignSource,
|
|
BaseTy, ResultExprTy, IsLowerBound);
|
|
EltPtr = emitArraySubscriptGEP(*this, Base, Idx, ResultExprTy,
|
|
!getLangOpts().isSignedOverflowDefined());
|
|
}
|
|
|
|
return MakeAddrLValue(EltPtr, ResultExprTy, AlignSource);
|
|
}
|
|
|
|
LValue CodeGenFunction::
|
|
EmitExtVectorElementExpr(const ExtVectorElementExpr *E) {
|
|
// Emit the base vector as an l-value.
|
|
LValue Base;
|
|
|
|
// ExtVectorElementExpr's base can either be a vector or pointer to vector.
|
|
if (E->isArrow()) {
|
|
// If it is a pointer to a vector, emit the address and form an lvalue with
|
|
// it.
|
|
AlignmentSource AlignSource;
|
|
Address Ptr = EmitPointerWithAlignment(E->getBase(), &AlignSource);
|
|
const PointerType *PT = E->getBase()->getType()->getAs<PointerType>();
|
|
Base = MakeAddrLValue(Ptr, PT->getPointeeType(), AlignSource);
|
|
Base.getQuals().removeObjCGCAttr();
|
|
} else if (E->getBase()->isGLValue()) {
|
|
// Otherwise, if the base is an lvalue ( as in the case of foo.x.x),
|
|
// emit the base as an lvalue.
|
|
assert(E->getBase()->getType()->isVectorType());
|
|
Base = EmitLValue(E->getBase());
|
|
} else {
|
|
// Otherwise, the base is a normal rvalue (as in (V+V).x), emit it as such.
|
|
assert(E->getBase()->getType()->isVectorType() &&
|
|
"Result must be a vector");
|
|
llvm::Value *Vec = EmitScalarExpr(E->getBase());
|
|
|
|
// Store the vector to memory (because LValue wants an address).
|
|
Address VecMem = CreateMemTemp(E->getBase()->getType());
|
|
Builder.CreateStore(Vec, VecMem);
|
|
Base = MakeAddrLValue(VecMem, E->getBase()->getType(),
|
|
AlignmentSource::Decl);
|
|
}
|
|
|
|
QualType type =
|
|
E->getType().withCVRQualifiers(Base.getQuals().getCVRQualifiers());
|
|
|
|
// Encode the element access list into a vector of unsigned indices.
|
|
SmallVector<uint32_t, 4> Indices;
|
|
E->getEncodedElementAccess(Indices);
|
|
|
|
if (Base.isSimple()) {
|
|
llvm::Constant *CV =
|
|
llvm::ConstantDataVector::get(getLLVMContext(), Indices);
|
|
return LValue::MakeExtVectorElt(Base.getAddress(), CV, type,
|
|
Base.getAlignmentSource());
|
|
}
|
|
assert(Base.isExtVectorElt() && "Can only subscript lvalue vec elts here!");
|
|
|
|
llvm::Constant *BaseElts = Base.getExtVectorElts();
|
|
SmallVector<llvm::Constant *, 4> CElts;
|
|
|
|
for (unsigned i = 0, e = Indices.size(); i != e; ++i)
|
|
CElts.push_back(BaseElts->getAggregateElement(Indices[i]));
|
|
llvm::Constant *CV = llvm::ConstantVector::get(CElts);
|
|
return LValue::MakeExtVectorElt(Base.getExtVectorAddress(), CV, type,
|
|
Base.getAlignmentSource());
|
|
}
|
|
|
|
LValue CodeGenFunction::EmitMemberExpr(const MemberExpr *E) {
|
|
Expr *BaseExpr = E->getBase();
|
|
|
|
// If this is s.x, emit s as an lvalue. If it is s->x, emit s as a scalar.
|
|
LValue BaseLV;
|
|
if (E->isArrow()) {
|
|
AlignmentSource AlignSource;
|
|
Address Addr = EmitPointerWithAlignment(BaseExpr, &AlignSource);
|
|
QualType PtrTy = BaseExpr->getType()->getPointeeType();
|
|
EmitTypeCheck(TCK_MemberAccess, E->getExprLoc(), Addr.getPointer(), PtrTy);
|
|
BaseLV = MakeAddrLValue(Addr, PtrTy, AlignSource);
|
|
} else
|
|
BaseLV = EmitCheckedLValue(BaseExpr, TCK_MemberAccess);
|
|
|
|
NamedDecl *ND = E->getMemberDecl();
|
|
if (auto *Field = dyn_cast<FieldDecl>(ND)) {
|
|
LValue LV = EmitLValueForField(BaseLV, Field);
|
|
setObjCGCLValueClass(getContext(), E, LV);
|
|
return LV;
|
|
}
|
|
|
|
if (auto *VD = dyn_cast<VarDecl>(ND))
|
|
return EmitGlobalVarDeclLValue(*this, E, VD);
|
|
|
|
if (const auto *FD = dyn_cast<FunctionDecl>(ND))
|
|
return EmitFunctionDeclLValue(*this, E, FD);
|
|
|
|
llvm_unreachable("Unhandled member declaration!");
|
|
}
|
|
|
|
/// Given that we are currently emitting a lambda, emit an l-value for
|
|
/// one of its members.
|
|
LValue CodeGenFunction::EmitLValueForLambdaField(const FieldDecl *Field) {
|
|
assert(cast<CXXMethodDecl>(CurCodeDecl)->getParent()->isLambda());
|
|
assert(cast<CXXMethodDecl>(CurCodeDecl)->getParent() == Field->getParent());
|
|
QualType LambdaTagType =
|
|
getContext().getTagDeclType(Field->getParent());
|
|
LValue LambdaLV = MakeNaturalAlignAddrLValue(CXXABIThisValue, LambdaTagType);
|
|
return EmitLValueForField(LambdaLV, Field);
|
|
}
|
|
|
|
/// Drill down to the storage of a field without walking into
|
|
/// reference types.
|
|
///
|
|
/// The resulting address doesn't necessarily have the right type.
|
|
static Address emitAddrOfFieldStorage(CodeGenFunction &CGF, Address base,
|
|
const FieldDecl *field) {
|
|
const RecordDecl *rec = field->getParent();
|
|
|
|
unsigned idx =
|
|
CGF.CGM.getTypes().getCGRecordLayout(rec).getLLVMFieldNo(field);
|
|
|
|
CharUnits offset;
|
|
// Adjust the alignment down to the given offset.
|
|
// As a special case, if the LLVM field index is 0, we know that this
|
|
// is zero.
|
|
assert((idx != 0 || CGF.getContext().getASTRecordLayout(rec)
|
|
.getFieldOffset(field->getFieldIndex()) == 0) &&
|
|
"LLVM field at index zero had non-zero offset?");
|
|
if (idx != 0) {
|
|
auto &recLayout = CGF.getContext().getASTRecordLayout(rec);
|
|
auto offsetInBits = recLayout.getFieldOffset(field->getFieldIndex());
|
|
offset = CGF.getContext().toCharUnitsFromBits(offsetInBits);
|
|
}
|
|
|
|
return CGF.Builder.CreateStructGEP(base, idx, offset, field->getName());
|
|
}
|
|
|
|
LValue CodeGenFunction::EmitLValueForField(LValue base,
|
|
const FieldDecl *field) {
|
|
AlignmentSource fieldAlignSource =
|
|
getFieldAlignmentSource(base.getAlignmentSource());
|
|
|
|
if (field->isBitField()) {
|
|
const CGRecordLayout &RL =
|
|
CGM.getTypes().getCGRecordLayout(field->getParent());
|
|
const CGBitFieldInfo &Info = RL.getBitFieldInfo(field);
|
|
Address Addr = base.getAddress();
|
|
unsigned Idx = RL.getLLVMFieldNo(field);
|
|
if (Idx != 0)
|
|
// For structs, we GEP to the field that the record layout suggests.
|
|
Addr = Builder.CreateStructGEP(Addr, Idx, Info.StorageOffset,
|
|
field->getName());
|
|
// Get the access type.
|
|
llvm::Type *FieldIntTy =
|
|
llvm::Type::getIntNTy(getLLVMContext(), Info.StorageSize);
|
|
if (Addr.getElementType() != FieldIntTy)
|
|
Addr = Builder.CreateElementBitCast(Addr, FieldIntTy);
|
|
|
|
QualType fieldType =
|
|
field->getType().withCVRQualifiers(base.getVRQualifiers());
|
|
return LValue::MakeBitfield(Addr, Info, fieldType, fieldAlignSource);
|
|
}
|
|
|
|
const RecordDecl *rec = field->getParent();
|
|
QualType type = field->getType();
|
|
|
|
bool mayAlias = rec->hasAttr<MayAliasAttr>();
|
|
|
|
Address addr = base.getAddress();
|
|
unsigned cvr = base.getVRQualifiers();
|
|
bool TBAAPath = CGM.getCodeGenOpts().StructPathTBAA;
|
|
if (rec->isUnion()) {
|
|
// For unions, there is no pointer adjustment.
|
|
assert(!type->isReferenceType() && "union has reference member");
|
|
// TODO: handle path-aware TBAA for union.
|
|
TBAAPath = false;
|
|
} else {
|
|
// For structs, we GEP to the field that the record layout suggests.
|
|
addr = emitAddrOfFieldStorage(*this, addr, field);
|
|
|
|
// If this is a reference field, load the reference right now.
|
|
if (const ReferenceType *refType = type->getAs<ReferenceType>()) {
|
|
llvm::LoadInst *load = Builder.CreateLoad(addr, "ref");
|
|
if (cvr & Qualifiers::Volatile) load->setVolatile(true);
|
|
|
|
// Loading the reference will disable path-aware TBAA.
|
|
TBAAPath = false;
|
|
if (CGM.shouldUseTBAA()) {
|
|
llvm::MDNode *tbaa;
|
|
if (mayAlias)
|
|
tbaa = CGM.getTBAAInfo(getContext().CharTy);
|
|
else
|
|
tbaa = CGM.getTBAAInfo(type);
|
|
if (tbaa)
|
|
CGM.DecorateInstructionWithTBAA(load, tbaa);
|
|
}
|
|
|
|
mayAlias = false;
|
|
type = refType->getPointeeType();
|
|
|
|
CharUnits alignment =
|
|
getNaturalTypeAlignment(type, &fieldAlignSource, /*pointee*/ true);
|
|
addr = Address(load, alignment);
|
|
|
|
// Qualifiers on the struct don't apply to the referencee, and
|
|
// we'll pick up CVR from the actual type later, so reset these
|
|
// additional qualifiers now.
|
|
cvr = 0;
|
|
}
|
|
}
|
|
|
|
// Make sure that the address is pointing to the right type. This is critical
|
|
// for both unions and structs. A union needs a bitcast, a struct element
|
|
// will need a bitcast if the LLVM type laid out doesn't match the desired
|
|
// type.
|
|
addr = Builder.CreateElementBitCast(addr,
|
|
CGM.getTypes().ConvertTypeForMem(type),
|
|
field->getName());
|
|
|
|
if (field->hasAttr<AnnotateAttr>())
|
|
addr = EmitFieldAnnotations(field, addr);
|
|
|
|
LValue LV = MakeAddrLValue(addr, type, fieldAlignSource);
|
|
LV.getQuals().addCVRQualifiers(cvr);
|
|
if (TBAAPath) {
|
|
const ASTRecordLayout &Layout =
|
|
getContext().getASTRecordLayout(field->getParent());
|
|
// Set the base type to be the base type of the base LValue and
|
|
// update offset to be relative to the base type.
|
|
LV.setTBAABaseType(mayAlias ? getContext().CharTy : base.getTBAABaseType());
|
|
LV.setTBAAOffset(mayAlias ? 0 : base.getTBAAOffset() +
|
|
Layout.getFieldOffset(field->getFieldIndex()) /
|
|
getContext().getCharWidth());
|
|
}
|
|
|
|
// __weak attribute on a field is ignored.
|
|
if (LV.getQuals().getObjCGCAttr() == Qualifiers::Weak)
|
|
LV.getQuals().removeObjCGCAttr();
|
|
|
|
// Fields of may_alias structs act like 'char' for TBAA purposes.
|
|
// FIXME: this should get propagated down through anonymous structs
|
|
// and unions.
|
|
if (mayAlias && LV.getTBAAInfo())
|
|
LV.setTBAAInfo(CGM.getTBAAInfo(getContext().CharTy));
|
|
|
|
return LV;
|
|
}
|
|
|
|
LValue
|
|
CodeGenFunction::EmitLValueForFieldInitialization(LValue Base,
|
|
const FieldDecl *Field) {
|
|
QualType FieldType = Field->getType();
|
|
|
|
if (!FieldType->isReferenceType())
|
|
return EmitLValueForField(Base, Field);
|
|
|
|
Address V = emitAddrOfFieldStorage(*this, Base.getAddress(), Field);
|
|
|
|
// Make sure that the address is pointing to the right type.
|
|
llvm::Type *llvmType = ConvertTypeForMem(FieldType);
|
|
V = Builder.CreateElementBitCast(V, llvmType, Field->getName());
|
|
|
|
// TODO: access-path TBAA?
|
|
auto FieldAlignSource = getFieldAlignmentSource(Base.getAlignmentSource());
|
|
return MakeAddrLValue(V, FieldType, FieldAlignSource);
|
|
}
|
|
|
|
LValue CodeGenFunction::EmitCompoundLiteralLValue(const CompoundLiteralExpr *E){
|
|
if (E->isFileScope()) {
|
|
ConstantAddress GlobalPtr = CGM.GetAddrOfConstantCompoundLiteral(E);
|
|
return MakeAddrLValue(GlobalPtr, E->getType(), AlignmentSource::Decl);
|
|
}
|
|
if (E->getType()->isVariablyModifiedType())
|
|
// make sure to emit the VLA size.
|
|
EmitVariablyModifiedType(E->getType());
|
|
|
|
Address DeclPtr = CreateMemTemp(E->getType(), ".compoundliteral");
|
|
const Expr *InitExpr = E->getInitializer();
|
|
LValue Result = MakeAddrLValue(DeclPtr, E->getType(), AlignmentSource::Decl);
|
|
|
|
EmitAnyExprToMem(InitExpr, DeclPtr, E->getType().getQualifiers(),
|
|
/*Init*/ true);
|
|
|
|
return Result;
|
|
}
|
|
|
|
LValue CodeGenFunction::EmitInitListLValue(const InitListExpr *E) {
|
|
if (!E->isGLValue())
|
|
// Initializing an aggregate temporary in C++11: T{...}.
|
|
return EmitAggExprToLValue(E);
|
|
|
|
// An lvalue initializer list must be initializing a reference.
|
|
assert(E->getNumInits() == 1 && "reference init with multiple values");
|
|
return EmitLValue(E->getInit(0));
|
|
}
|
|
|
|
/// Emit the operand of a glvalue conditional operator. This is either a glvalue
|
|
/// or a (possibly-parenthesized) throw-expression. If this is a throw, no
|
|
/// LValue is returned and the current block has been terminated.
|
|
static Optional<LValue> EmitLValueOrThrowExpression(CodeGenFunction &CGF,
|
|
const Expr *Operand) {
|
|
if (auto *ThrowExpr = dyn_cast<CXXThrowExpr>(Operand->IgnoreParens())) {
|
|
CGF.EmitCXXThrowExpr(ThrowExpr, /*KeepInsertionPoint*/false);
|
|
return None;
|
|
}
|
|
|
|
return CGF.EmitLValue(Operand);
|
|
}
|
|
|
|
LValue CodeGenFunction::
|
|
EmitConditionalOperatorLValue(const AbstractConditionalOperator *expr) {
|
|
if (!expr->isGLValue()) {
|
|
// ?: here should be an aggregate.
|
|
assert(hasAggregateEvaluationKind(expr->getType()) &&
|
|
"Unexpected conditional operator!");
|
|
return EmitAggExprToLValue(expr);
|
|
}
|
|
|
|
OpaqueValueMapping binding(*this, expr);
|
|
|
|
const Expr *condExpr = expr->getCond();
|
|
bool CondExprBool;
|
|
if (ConstantFoldsToSimpleInteger(condExpr, CondExprBool)) {
|
|
const Expr *live = expr->getTrueExpr(), *dead = expr->getFalseExpr();
|
|
if (!CondExprBool) std::swap(live, dead);
|
|
|
|
if (!ContainsLabel(dead)) {
|
|
// If the true case is live, we need to track its region.
|
|
if (CondExprBool)
|
|
incrementProfileCounter(expr);
|
|
return EmitLValue(live);
|
|
}
|
|
}
|
|
|
|
llvm::BasicBlock *lhsBlock = createBasicBlock("cond.true");
|
|
llvm::BasicBlock *rhsBlock = createBasicBlock("cond.false");
|
|
llvm::BasicBlock *contBlock = createBasicBlock("cond.end");
|
|
|
|
ConditionalEvaluation eval(*this);
|
|
EmitBranchOnBoolExpr(condExpr, lhsBlock, rhsBlock, getProfileCount(expr));
|
|
|
|
// Any temporaries created here are conditional.
|
|
EmitBlock(lhsBlock);
|
|
incrementProfileCounter(expr);
|
|
eval.begin(*this);
|
|
Optional<LValue> lhs =
|
|
EmitLValueOrThrowExpression(*this, expr->getTrueExpr());
|
|
eval.end(*this);
|
|
|
|
if (lhs && !lhs->isSimple())
|
|
return EmitUnsupportedLValue(expr, "conditional operator");
|
|
|
|
lhsBlock = Builder.GetInsertBlock();
|
|
if (lhs)
|
|
Builder.CreateBr(contBlock);
|
|
|
|
// Any temporaries created here are conditional.
|
|
EmitBlock(rhsBlock);
|
|
eval.begin(*this);
|
|
Optional<LValue> rhs =
|
|
EmitLValueOrThrowExpression(*this, expr->getFalseExpr());
|
|
eval.end(*this);
|
|
if (rhs && !rhs->isSimple())
|
|
return EmitUnsupportedLValue(expr, "conditional operator");
|
|
rhsBlock = Builder.GetInsertBlock();
|
|
|
|
EmitBlock(contBlock);
|
|
|
|
if (lhs && rhs) {
|
|
llvm::PHINode *phi = Builder.CreatePHI(lhs->getPointer()->getType(),
|
|
2, "cond-lvalue");
|
|
phi->addIncoming(lhs->getPointer(), lhsBlock);
|
|
phi->addIncoming(rhs->getPointer(), rhsBlock);
|
|
Address result(phi, std::min(lhs->getAlignment(), rhs->getAlignment()));
|
|
AlignmentSource alignSource =
|
|
std::max(lhs->getAlignmentSource(), rhs->getAlignmentSource());
|
|
return MakeAddrLValue(result, expr->getType(), alignSource);
|
|
} else {
|
|
assert((lhs || rhs) &&
|
|
"both operands of glvalue conditional are throw-expressions?");
|
|
return lhs ? *lhs : *rhs;
|
|
}
|
|
}
|
|
|
|
/// EmitCastLValue - Casts are never lvalues unless that cast is to a reference
|
|
/// type. If the cast is to a reference, we can have the usual lvalue result,
|
|
/// otherwise if a cast is needed by the code generator in an lvalue context,
|
|
/// then it must mean that we need the address of an aggregate in order to
|
|
/// access one of its members. This can happen for all the reasons that casts
|
|
/// are permitted with aggregate result, including noop aggregate casts, and
|
|
/// cast from scalar to union.
|
|
LValue CodeGenFunction::EmitCastLValue(const CastExpr *E) {
|
|
switch (E->getCastKind()) {
|
|
case CK_ToVoid:
|
|
case CK_BitCast:
|
|
case CK_ArrayToPointerDecay:
|
|
case CK_FunctionToPointerDecay:
|
|
case CK_NullToMemberPointer:
|
|
case CK_NullToPointer:
|
|
case CK_IntegralToPointer:
|
|
case CK_PointerToIntegral:
|
|
case CK_PointerToBoolean:
|
|
case CK_VectorSplat:
|
|
case CK_IntegralCast:
|
|
case CK_BooleanToSignedIntegral:
|
|
case CK_IntegralToBoolean:
|
|
case CK_IntegralToFloating:
|
|
case CK_FloatingToIntegral:
|
|
case CK_FloatingToBoolean:
|
|
case CK_FloatingCast:
|
|
case CK_FloatingRealToComplex:
|
|
case CK_FloatingComplexToReal:
|
|
case CK_FloatingComplexToBoolean:
|
|
case CK_FloatingComplexCast:
|
|
case CK_FloatingComplexToIntegralComplex:
|
|
case CK_IntegralRealToComplex:
|
|
case CK_IntegralComplexToReal:
|
|
case CK_IntegralComplexToBoolean:
|
|
case CK_IntegralComplexCast:
|
|
case CK_IntegralComplexToFloatingComplex:
|
|
case CK_DerivedToBaseMemberPointer:
|
|
case CK_BaseToDerivedMemberPointer:
|
|
case CK_MemberPointerToBoolean:
|
|
case CK_ReinterpretMemberPointer:
|
|
case CK_AnyPointerToBlockPointerCast:
|
|
case CK_ARCProduceObject:
|
|
case CK_ARCConsumeObject:
|
|
case CK_ARCReclaimReturnedObject:
|
|
case CK_ARCExtendBlockObject:
|
|
case CK_CopyAndAutoreleaseBlockObject:
|
|
case CK_AddressSpaceConversion:
|
|
return EmitUnsupportedLValue(E, "unexpected cast lvalue");
|
|
|
|
case CK_Dependent:
|
|
llvm_unreachable("dependent cast kind in IR gen!");
|
|
|
|
case CK_BuiltinFnToFnPtr:
|
|
llvm_unreachable("builtin functions are handled elsewhere");
|
|
|
|
// These are never l-values; just use the aggregate emission code.
|
|
case CK_NonAtomicToAtomic:
|
|
case CK_AtomicToNonAtomic:
|
|
return EmitAggExprToLValue(E);
|
|
|
|
case CK_Dynamic: {
|
|
LValue LV = EmitLValue(E->getSubExpr());
|
|
Address V = LV.getAddress();
|
|
const auto *DCE = cast<CXXDynamicCastExpr>(E);
|
|
return MakeNaturalAlignAddrLValue(EmitDynamicCast(V, DCE), E->getType());
|
|
}
|
|
|
|
case CK_ConstructorConversion:
|
|
case CK_UserDefinedConversion:
|
|
case CK_CPointerToObjCPointerCast:
|
|
case CK_BlockPointerToObjCPointerCast:
|
|
case CK_NoOp:
|
|
case CK_LValueToRValue:
|
|
return EmitLValue(E->getSubExpr());
|
|
|
|
case CK_UncheckedDerivedToBase:
|
|
case CK_DerivedToBase: {
|
|
const RecordType *DerivedClassTy =
|
|
E->getSubExpr()->getType()->getAs<RecordType>();
|
|
auto *DerivedClassDecl = cast<CXXRecordDecl>(DerivedClassTy->getDecl());
|
|
|
|
LValue LV = EmitLValue(E->getSubExpr());
|
|
Address This = LV.getAddress();
|
|
|
|
// Perform the derived-to-base conversion
|
|
Address Base = GetAddressOfBaseClass(
|
|
This, DerivedClassDecl, E->path_begin(), E->path_end(),
|
|
/*NullCheckValue=*/false, E->getExprLoc());
|
|
|
|
return MakeAddrLValue(Base, E->getType(), LV.getAlignmentSource());
|
|
}
|
|
case CK_ToUnion:
|
|
return EmitAggExprToLValue(E);
|
|
case CK_BaseToDerived: {
|
|
const RecordType *DerivedClassTy = E->getType()->getAs<RecordType>();
|
|
auto *DerivedClassDecl = cast<CXXRecordDecl>(DerivedClassTy->getDecl());
|
|
|
|
LValue LV = EmitLValue(E->getSubExpr());
|
|
|
|
// Perform the base-to-derived conversion
|
|
Address Derived =
|
|
GetAddressOfDerivedClass(LV.getAddress(), DerivedClassDecl,
|
|
E->path_begin(), E->path_end(),
|
|
/*NullCheckValue=*/false);
|
|
|
|
// C++11 [expr.static.cast]p2: Behavior is undefined if a downcast is
|
|
// performed and the object is not of the derived type.
|
|
if (sanitizePerformTypeCheck())
|
|
EmitTypeCheck(TCK_DowncastReference, E->getExprLoc(),
|
|
Derived.getPointer(), E->getType());
|
|
|
|
if (SanOpts.has(SanitizerKind::CFIDerivedCast))
|
|
EmitVTablePtrCheckForCast(E->getType(), Derived.getPointer(),
|
|
/*MayBeNull=*/false,
|
|
CFITCK_DerivedCast, E->getLocStart());
|
|
|
|
return MakeAddrLValue(Derived, E->getType(), LV.getAlignmentSource());
|
|
}
|
|
case CK_LValueBitCast: {
|
|
// This must be a reinterpret_cast (or c-style equivalent).
|
|
const auto *CE = cast<ExplicitCastExpr>(E);
|
|
|
|
CGM.EmitExplicitCastExprType(CE, this);
|
|
LValue LV = EmitLValue(E->getSubExpr());
|
|
Address V = Builder.CreateBitCast(LV.getAddress(),
|
|
ConvertType(CE->getTypeAsWritten()));
|
|
|
|
if (SanOpts.has(SanitizerKind::CFIUnrelatedCast))
|
|
EmitVTablePtrCheckForCast(E->getType(), V.getPointer(),
|
|
/*MayBeNull=*/false,
|
|
CFITCK_UnrelatedCast, E->getLocStart());
|
|
|
|
return MakeAddrLValue(V, E->getType(), LV.getAlignmentSource());
|
|
}
|
|
case CK_ObjCObjectLValueCast: {
|
|
LValue LV = EmitLValue(E->getSubExpr());
|
|
Address V = Builder.CreateElementBitCast(LV.getAddress(),
|
|
ConvertType(E->getType()));
|
|
return MakeAddrLValue(V, E->getType(), LV.getAlignmentSource());
|
|
}
|
|
case CK_ZeroToOCLEvent:
|
|
llvm_unreachable("NULL to OpenCL event lvalue cast is not valid");
|
|
}
|
|
|
|
llvm_unreachable("Unhandled lvalue cast kind?");
|
|
}
|
|
|
|
LValue CodeGenFunction::EmitOpaqueValueLValue(const OpaqueValueExpr *e) {
|
|
assert(OpaqueValueMappingData::shouldBindAsLValue(e));
|
|
return getOpaqueLValueMapping(e);
|
|
}
|
|
|
|
RValue CodeGenFunction::EmitRValueForField(LValue LV,
|
|
const FieldDecl *FD,
|
|
SourceLocation Loc) {
|
|
QualType FT = FD->getType();
|
|
LValue FieldLV = EmitLValueForField(LV, FD);
|
|
switch (getEvaluationKind(FT)) {
|
|
case TEK_Complex:
|
|
return RValue::getComplex(EmitLoadOfComplex(FieldLV, Loc));
|
|
case TEK_Aggregate:
|
|
return FieldLV.asAggregateRValue();
|
|
case TEK_Scalar:
|
|
// This routine is used to load fields one-by-one to perform a copy, so
|
|
// don't load reference fields.
|
|
if (FD->getType()->isReferenceType())
|
|
return RValue::get(FieldLV.getPointer());
|
|
return EmitLoadOfLValue(FieldLV, Loc);
|
|
}
|
|
llvm_unreachable("bad evaluation kind");
|
|
}
|
|
|
|
//===--------------------------------------------------------------------===//
|
|
// Expression Emission
|
|
//===--------------------------------------------------------------------===//
|
|
|
|
RValue CodeGenFunction::EmitCallExpr(const CallExpr *E,
|
|
ReturnValueSlot ReturnValue) {
|
|
// Builtins never have block type.
|
|
if (E->getCallee()->getType()->isBlockPointerType())
|
|
return EmitBlockCallExpr(E, ReturnValue);
|
|
|
|
if (const auto *CE = dyn_cast<CXXMemberCallExpr>(E))
|
|
return EmitCXXMemberCallExpr(CE, ReturnValue);
|
|
|
|
if (const auto *CE = dyn_cast<CUDAKernelCallExpr>(E))
|
|
return EmitCUDAKernelCallExpr(CE, ReturnValue);
|
|
|
|
const Decl *TargetDecl = E->getCalleeDecl();
|
|
if (const FunctionDecl *FD = dyn_cast_or_null<FunctionDecl>(TargetDecl)) {
|
|
if (unsigned builtinID = FD->getBuiltinID())
|
|
return EmitBuiltinExpr(FD, builtinID, E, ReturnValue);
|
|
}
|
|
|
|
if (const auto *CE = dyn_cast<CXXOperatorCallExpr>(E))
|
|
if (const CXXMethodDecl *MD = dyn_cast_or_null<CXXMethodDecl>(TargetDecl))
|
|
return EmitCXXOperatorMemberCallExpr(CE, MD, ReturnValue);
|
|
|
|
if (const auto *PseudoDtor =
|
|
dyn_cast<CXXPseudoDestructorExpr>(E->getCallee()->IgnoreParens())) {
|
|
QualType DestroyedType = PseudoDtor->getDestroyedType();
|
|
if (DestroyedType.hasStrongOrWeakObjCLifetime()) {
|
|
// Automatic Reference Counting:
|
|
// If the pseudo-expression names a retainable object with weak or
|
|
// strong lifetime, the object shall be released.
|
|
Expr *BaseExpr = PseudoDtor->getBase();
|
|
Address BaseValue = Address::invalid();
|
|
Qualifiers BaseQuals;
|
|
|
|
// If this is s.x, emit s as an lvalue. If it is s->x, emit s as a scalar.
|
|
if (PseudoDtor->isArrow()) {
|
|
BaseValue = EmitPointerWithAlignment(BaseExpr);
|
|
const PointerType *PTy = BaseExpr->getType()->getAs<PointerType>();
|
|
BaseQuals = PTy->getPointeeType().getQualifiers();
|
|
} else {
|
|
LValue BaseLV = EmitLValue(BaseExpr);
|
|
BaseValue = BaseLV.getAddress();
|
|
QualType BaseTy = BaseExpr->getType();
|
|
BaseQuals = BaseTy.getQualifiers();
|
|
}
|
|
|
|
switch (DestroyedType.getObjCLifetime()) {
|
|
case Qualifiers::OCL_None:
|
|
case Qualifiers::OCL_ExplicitNone:
|
|
case Qualifiers::OCL_Autoreleasing:
|
|
break;
|
|
|
|
case Qualifiers::OCL_Strong:
|
|
EmitARCRelease(Builder.CreateLoad(BaseValue,
|
|
PseudoDtor->getDestroyedType().isVolatileQualified()),
|
|
ARCPreciseLifetime);
|
|
break;
|
|
|
|
case Qualifiers::OCL_Weak:
|
|
EmitARCDestroyWeak(BaseValue);
|
|
break;
|
|
}
|
|
} else {
|
|
// C++ [expr.pseudo]p1:
|
|
// The result shall only be used as the operand for the function call
|
|
// operator (), and the result of such a call has type void. The only
|
|
// effect is the evaluation of the postfix-expression before the dot or
|
|
// arrow.
|
|
EmitScalarExpr(E->getCallee());
|
|
}
|
|
|
|
return RValue::get(nullptr);
|
|
}
|
|
|
|
llvm::Value *Callee = EmitScalarExpr(E->getCallee());
|
|
return EmitCall(E->getCallee()->getType(), Callee, E, ReturnValue,
|
|
TargetDecl);
|
|
}
|
|
|
|
LValue CodeGenFunction::EmitBinaryOperatorLValue(const BinaryOperator *E) {
|
|
// Comma expressions just emit their LHS then their RHS as an l-value.
|
|
if (E->getOpcode() == BO_Comma) {
|
|
EmitIgnoredExpr(E->getLHS());
|
|
EnsureInsertPoint();
|
|
return EmitLValue(E->getRHS());
|
|
}
|
|
|
|
if (E->getOpcode() == BO_PtrMemD ||
|
|
E->getOpcode() == BO_PtrMemI)
|
|
return EmitPointerToDataMemberBinaryExpr(E);
|
|
|
|
assert(E->getOpcode() == BO_Assign && "unexpected binary l-value");
|
|
|
|
// Note that in all of these cases, __block variables need the RHS
|
|
// evaluated first just in case the variable gets moved by the RHS.
|
|
|
|
switch (getEvaluationKind(E->getType())) {
|
|
case TEK_Scalar: {
|
|
switch (E->getLHS()->getType().getObjCLifetime()) {
|
|
case Qualifiers::OCL_Strong:
|
|
return EmitARCStoreStrong(E, /*ignored*/ false).first;
|
|
|
|
case Qualifiers::OCL_Autoreleasing:
|
|
return EmitARCStoreAutoreleasing(E).first;
|
|
|
|
// No reason to do any of these differently.
|
|
case Qualifiers::OCL_None:
|
|
case Qualifiers::OCL_ExplicitNone:
|
|
case Qualifiers::OCL_Weak:
|
|
break;
|
|
}
|
|
|
|
RValue RV = EmitAnyExpr(E->getRHS());
|
|
LValue LV = EmitCheckedLValue(E->getLHS(), TCK_Store);
|
|
EmitStoreThroughLValue(RV, LV);
|
|
return LV;
|
|
}
|
|
|
|
case TEK_Complex:
|
|
return EmitComplexAssignmentLValue(E);
|
|
|
|
case TEK_Aggregate:
|
|
return EmitAggExprToLValue(E);
|
|
}
|
|
llvm_unreachable("bad evaluation kind");
|
|
}
|
|
|
|
LValue CodeGenFunction::EmitCallExprLValue(const CallExpr *E) {
|
|
RValue RV = EmitCallExpr(E);
|
|
|
|
if (!RV.isScalar())
|
|
return MakeAddrLValue(RV.getAggregateAddress(), E->getType(),
|
|
AlignmentSource::Decl);
|
|
|
|
assert(E->getCallReturnType(getContext())->isReferenceType() &&
|
|
"Can't have a scalar return unless the return type is a "
|
|
"reference type!");
|
|
|
|
return MakeNaturalAlignPointeeAddrLValue(RV.getScalarVal(), E->getType());
|
|
}
|
|
|
|
LValue CodeGenFunction::EmitVAArgExprLValue(const VAArgExpr *E) {
|
|
// FIXME: This shouldn't require another copy.
|
|
return EmitAggExprToLValue(E);
|
|
}
|
|
|
|
LValue CodeGenFunction::EmitCXXConstructLValue(const CXXConstructExpr *E) {
|
|
assert(E->getType()->getAsCXXRecordDecl()->hasTrivialDestructor()
|
|
&& "binding l-value to type which needs a temporary");
|
|
AggValueSlot Slot = CreateAggTemp(E->getType());
|
|
EmitCXXConstructExpr(E, Slot);
|
|
return MakeAddrLValue(Slot.getAddress(), E->getType(),
|
|
AlignmentSource::Decl);
|
|
}
|
|
|
|
LValue
|
|
CodeGenFunction::EmitCXXTypeidLValue(const CXXTypeidExpr *E) {
|
|
return MakeNaturalAlignAddrLValue(EmitCXXTypeidExpr(E), E->getType());
|
|
}
|
|
|
|
Address CodeGenFunction::EmitCXXUuidofExpr(const CXXUuidofExpr *E) {
|
|
return Builder.CreateElementBitCast(CGM.GetAddrOfUuidDescriptor(E),
|
|
ConvertType(E->getType()));
|
|
}
|
|
|
|
LValue CodeGenFunction::EmitCXXUuidofLValue(const CXXUuidofExpr *E) {
|
|
return MakeAddrLValue(EmitCXXUuidofExpr(E), E->getType(),
|
|
AlignmentSource::Decl);
|
|
}
|
|
|
|
LValue
|
|
CodeGenFunction::EmitCXXBindTemporaryLValue(const CXXBindTemporaryExpr *E) {
|
|
AggValueSlot Slot = CreateAggTemp(E->getType(), "temp.lvalue");
|
|
Slot.setExternallyDestructed();
|
|
EmitAggExpr(E->getSubExpr(), Slot);
|
|
EmitCXXTemporary(E->getTemporary(), E->getType(), Slot.getAddress());
|
|
return MakeAddrLValue(Slot.getAddress(), E->getType(),
|
|
AlignmentSource::Decl);
|
|
}
|
|
|
|
LValue
|
|
CodeGenFunction::EmitLambdaLValue(const LambdaExpr *E) {
|
|
AggValueSlot Slot = CreateAggTemp(E->getType(), "temp.lvalue");
|
|
EmitLambdaExpr(E, Slot);
|
|
return MakeAddrLValue(Slot.getAddress(), E->getType(),
|
|
AlignmentSource::Decl);
|
|
}
|
|
|
|
LValue CodeGenFunction::EmitObjCMessageExprLValue(const ObjCMessageExpr *E) {
|
|
RValue RV = EmitObjCMessageExpr(E);
|
|
|
|
if (!RV.isScalar())
|
|
return MakeAddrLValue(RV.getAggregateAddress(), E->getType(),
|
|
AlignmentSource::Decl);
|
|
|
|
assert(E->getMethodDecl()->getReturnType()->isReferenceType() &&
|
|
"Can't have a scalar return unless the return type is a "
|
|
"reference type!");
|
|
|
|
return MakeNaturalAlignPointeeAddrLValue(RV.getScalarVal(), E->getType());
|
|
}
|
|
|
|
LValue CodeGenFunction::EmitObjCSelectorLValue(const ObjCSelectorExpr *E) {
|
|
Address V =
|
|
CGM.getObjCRuntime().GetAddrOfSelector(*this, E->getSelector());
|
|
return MakeAddrLValue(V, E->getType(), AlignmentSource::Decl);
|
|
}
|
|
|
|
llvm::Value *CodeGenFunction::EmitIvarOffset(const ObjCInterfaceDecl *Interface,
|
|
const ObjCIvarDecl *Ivar) {
|
|
return CGM.getObjCRuntime().EmitIvarOffset(*this, Interface, Ivar);
|
|
}
|
|
|
|
LValue CodeGenFunction::EmitLValueForIvar(QualType ObjectTy,
|
|
llvm::Value *BaseValue,
|
|
const ObjCIvarDecl *Ivar,
|
|
unsigned CVRQualifiers) {
|
|
return CGM.getObjCRuntime().EmitObjCValueForIvar(*this, ObjectTy, BaseValue,
|
|
Ivar, CVRQualifiers);
|
|
}
|
|
|
|
LValue CodeGenFunction::EmitObjCIvarRefLValue(const ObjCIvarRefExpr *E) {
|
|
// FIXME: A lot of the code below could be shared with EmitMemberExpr.
|
|
llvm::Value *BaseValue = nullptr;
|
|
const Expr *BaseExpr = E->getBase();
|
|
Qualifiers BaseQuals;
|
|
QualType ObjectTy;
|
|
if (E->isArrow()) {
|
|
BaseValue = EmitScalarExpr(BaseExpr);
|
|
ObjectTy = BaseExpr->getType()->getPointeeType();
|
|
BaseQuals = ObjectTy.getQualifiers();
|
|
} else {
|
|
LValue BaseLV = EmitLValue(BaseExpr);
|
|
BaseValue = BaseLV.getPointer();
|
|
ObjectTy = BaseExpr->getType();
|
|
BaseQuals = ObjectTy.getQualifiers();
|
|
}
|
|
|
|
LValue LV =
|
|
EmitLValueForIvar(ObjectTy, BaseValue, E->getDecl(),
|
|
BaseQuals.getCVRQualifiers());
|
|
setObjCGCLValueClass(getContext(), E, LV);
|
|
return LV;
|
|
}
|
|
|
|
LValue CodeGenFunction::EmitStmtExprLValue(const StmtExpr *E) {
|
|
// Can only get l-value for message expression returning aggregate type
|
|
RValue RV = EmitAnyExprToTemp(E);
|
|
return MakeAddrLValue(RV.getAggregateAddress(), E->getType(),
|
|
AlignmentSource::Decl);
|
|
}
|
|
|
|
RValue CodeGenFunction::EmitCall(QualType CalleeType, llvm::Value *Callee,
|
|
const CallExpr *E, ReturnValueSlot ReturnValue,
|
|
CGCalleeInfo CalleeInfo, llvm::Value *Chain) {
|
|
// Get the actual function type. The callee type will always be a pointer to
|
|
// function type or a block pointer type.
|
|
assert(CalleeType->isFunctionPointerType() &&
|
|
"Call must have function pointer type!");
|
|
|
|
// Preserve the non-canonical function type because things like exception
|
|
// specifications disappear in the canonical type. That information is useful
|
|
// to drive the generation of more accurate code for this call later on.
|
|
const FunctionProtoType *NonCanonicalFTP = CalleeType->getAs<PointerType>()
|
|
->getPointeeType()
|
|
->getAs<FunctionProtoType>();
|
|
|
|
const Decl *TargetDecl = CalleeInfo.getCalleeDecl();
|
|
|
|
if (const FunctionDecl *FD = dyn_cast_or_null<FunctionDecl>(TargetDecl))
|
|
// We can only guarantee that a function is called from the correct
|
|
// context/function based on the appropriate target attributes,
|
|
// so only check in the case where we have both always_inline and target
|
|
// since otherwise we could be making a conditional call after a check for
|
|
// the proper cpu features (and it won't cause code generation issues due to
|
|
// function based code generation).
|
|
if (TargetDecl->hasAttr<AlwaysInlineAttr>() &&
|
|
TargetDecl->hasAttr<TargetAttr>())
|
|
checkTargetFeatures(E, FD);
|
|
|
|
CalleeType = getContext().getCanonicalType(CalleeType);
|
|
|
|
const auto *FnType =
|
|
cast<FunctionType>(cast<PointerType>(CalleeType)->getPointeeType());
|
|
|
|
if (getLangOpts().CPlusPlus && SanOpts.has(SanitizerKind::Function) &&
|
|
(!TargetDecl || !isa<FunctionDecl>(TargetDecl))) {
|
|
if (llvm::Constant *PrefixSig =
|
|
CGM.getTargetCodeGenInfo().getUBSanFunctionSignature(CGM)) {
|
|
SanitizerScope SanScope(this);
|
|
llvm::Constant *FTRTTIConst =
|
|
CGM.GetAddrOfRTTIDescriptor(QualType(FnType, 0), /*ForEH=*/true);
|
|
llvm::Type *PrefixStructTyElems[] = {
|
|
PrefixSig->getType(),
|
|
FTRTTIConst->getType()
|
|
};
|
|
llvm::StructType *PrefixStructTy = llvm::StructType::get(
|
|
CGM.getLLVMContext(), PrefixStructTyElems, /*isPacked=*/true);
|
|
|
|
llvm::Value *CalleePrefixStruct = Builder.CreateBitCast(
|
|
Callee, llvm::PointerType::getUnqual(PrefixStructTy));
|
|
llvm::Value *CalleeSigPtr =
|
|
Builder.CreateConstGEP2_32(PrefixStructTy, CalleePrefixStruct, 0, 0);
|
|
llvm::Value *CalleeSig =
|
|
Builder.CreateAlignedLoad(CalleeSigPtr, getIntAlign());
|
|
llvm::Value *CalleeSigMatch = Builder.CreateICmpEQ(CalleeSig, PrefixSig);
|
|
|
|
llvm::BasicBlock *Cont = createBasicBlock("cont");
|
|
llvm::BasicBlock *TypeCheck = createBasicBlock("typecheck");
|
|
Builder.CreateCondBr(CalleeSigMatch, TypeCheck, Cont);
|
|
|
|
EmitBlock(TypeCheck);
|
|
llvm::Value *CalleeRTTIPtr =
|
|
Builder.CreateConstGEP2_32(PrefixStructTy, CalleePrefixStruct, 0, 1);
|
|
llvm::Value *CalleeRTTI =
|
|
Builder.CreateAlignedLoad(CalleeRTTIPtr, getPointerAlign());
|
|
llvm::Value *CalleeRTTIMatch =
|
|
Builder.CreateICmpEQ(CalleeRTTI, FTRTTIConst);
|
|
llvm::Constant *StaticData[] = {
|
|
EmitCheckSourceLocation(E->getLocStart()),
|
|
EmitCheckTypeDescriptor(CalleeType)
|
|
};
|
|
EmitCheck(std::make_pair(CalleeRTTIMatch, SanitizerKind::Function),
|
|
"function_type_mismatch", StaticData, Callee);
|
|
|
|
Builder.CreateBr(Cont);
|
|
EmitBlock(Cont);
|
|
}
|
|
}
|
|
|
|
// If we are checking indirect calls and this call is indirect, check that the
|
|
// function pointer is a member of the bit set for the function type.
|
|
if (SanOpts.has(SanitizerKind::CFIICall) &&
|
|
(!TargetDecl || !isa<FunctionDecl>(TargetDecl))) {
|
|
SanitizerScope SanScope(this);
|
|
EmitSanitizerStatReport(llvm::SanStat_CFI_ICall);
|
|
|
|
llvm::Metadata *MD = CGM.CreateMetadataIdentifierForType(QualType(FnType, 0));
|
|
llvm::Value *TypeId = llvm::MetadataAsValue::get(getLLVMContext(), MD);
|
|
|
|
llvm::Value *CastedCallee = Builder.CreateBitCast(Callee, Int8PtrTy);
|
|
llvm::Value *TypeTest = Builder.CreateCall(
|
|
CGM.getIntrinsic(llvm::Intrinsic::type_test), {CastedCallee, TypeId});
|
|
|
|
auto CrossDsoTypeId = CGM.CreateCrossDsoCfiTypeId(MD);
|
|
llvm::Constant *StaticData[] = {
|
|
llvm::ConstantInt::get(Int8Ty, CFITCK_ICall),
|
|
EmitCheckSourceLocation(E->getLocStart()),
|
|
EmitCheckTypeDescriptor(QualType(FnType, 0)),
|
|
};
|
|
if (CGM.getCodeGenOpts().SanitizeCfiCrossDso && CrossDsoTypeId) {
|
|
EmitCfiSlowPathCheck(SanitizerKind::CFIICall, TypeTest, CrossDsoTypeId,
|
|
CastedCallee, StaticData);
|
|
} else {
|
|
EmitCheck(std::make_pair(TypeTest, SanitizerKind::CFIICall),
|
|
"cfi_check_fail", StaticData,
|
|
{CastedCallee, llvm::UndefValue::get(IntPtrTy)});
|
|
}
|
|
}
|
|
|
|
CallArgList Args;
|
|
if (Chain)
|
|
Args.add(RValue::get(Builder.CreateBitCast(Chain, CGM.VoidPtrTy)),
|
|
CGM.getContext().VoidPtrTy);
|
|
EmitCallArgs(Args, dyn_cast<FunctionProtoType>(FnType), E->arguments(),
|
|
E->getDirectCallee(), /*ParamsToSkip*/ 0);
|
|
|
|
const CGFunctionInfo &FnInfo = CGM.getTypes().arrangeFreeFunctionCall(
|
|
Args, FnType, /*isChainCall=*/Chain);
|
|
|
|
// C99 6.5.2.2p6:
|
|
// If the expression that denotes the called function has a type
|
|
// that does not include a prototype, [the default argument
|
|
// promotions are performed]. If the number of arguments does not
|
|
// equal the number of parameters, the behavior is undefined. If
|
|
// the function is defined with a type that includes a prototype,
|
|
// and either the prototype ends with an ellipsis (, ...) or the
|
|
// types of the arguments after promotion are not compatible with
|
|
// the types of the parameters, the behavior is undefined. If the
|
|
// function is defined with a type that does not include a
|
|
// prototype, and the types of the arguments after promotion are
|
|
// not compatible with those of the parameters after promotion,
|
|
// the behavior is undefined [except in some trivial cases].
|
|
// That is, in the general case, we should assume that a call
|
|
// through an unprototyped function type works like a *non-variadic*
|
|
// call. The way we make this work is to cast to the exact type
|
|
// of the promoted arguments.
|
|
//
|
|
// Chain calls use this same code path to add the invisible chain parameter
|
|
// to the function type.
|
|
if (isa<FunctionNoProtoType>(FnType) || Chain) {
|
|
llvm::Type *CalleeTy = getTypes().GetFunctionType(FnInfo);
|
|
CalleeTy = CalleeTy->getPointerTo();
|
|
Callee = Builder.CreateBitCast(Callee, CalleeTy, "callee.knr.cast");
|
|
}
|
|
|
|
return EmitCall(FnInfo, Callee, ReturnValue, Args,
|
|
CGCalleeInfo(NonCanonicalFTP, TargetDecl));
|
|
}
|
|
|
|
LValue CodeGenFunction::
|
|
EmitPointerToDataMemberBinaryExpr(const BinaryOperator *E) {
|
|
Address BaseAddr = Address::invalid();
|
|
if (E->getOpcode() == BO_PtrMemI) {
|
|
BaseAddr = EmitPointerWithAlignment(E->getLHS());
|
|
} else {
|
|
BaseAddr = EmitLValue(E->getLHS()).getAddress();
|
|
}
|
|
|
|
llvm::Value *OffsetV = EmitScalarExpr(E->getRHS());
|
|
|
|
const MemberPointerType *MPT
|
|
= E->getRHS()->getType()->getAs<MemberPointerType>();
|
|
|
|
AlignmentSource AlignSource;
|
|
Address MemberAddr =
|
|
EmitCXXMemberDataPointerAddress(E, BaseAddr, OffsetV, MPT,
|
|
&AlignSource);
|
|
|
|
return MakeAddrLValue(MemberAddr, MPT->getPointeeType(), AlignSource);
|
|
}
|
|
|
|
/// Given the address of a temporary variable, produce an r-value of
|
|
/// its type.
|
|
RValue CodeGenFunction::convertTempToRValue(Address addr,
|
|
QualType type,
|
|
SourceLocation loc) {
|
|
LValue lvalue = MakeAddrLValue(addr, type, AlignmentSource::Decl);
|
|
switch (getEvaluationKind(type)) {
|
|
case TEK_Complex:
|
|
return RValue::getComplex(EmitLoadOfComplex(lvalue, loc));
|
|
case TEK_Aggregate:
|
|
return lvalue.asAggregateRValue();
|
|
case TEK_Scalar:
|
|
return RValue::get(EmitLoadOfScalar(lvalue, loc));
|
|
}
|
|
llvm_unreachable("bad evaluation kind");
|
|
}
|
|
|
|
void CodeGenFunction::SetFPAccuracy(llvm::Value *Val, float Accuracy) {
|
|
assert(Val->getType()->isFPOrFPVectorTy());
|
|
if (Accuracy == 0.0 || !isa<llvm::Instruction>(Val))
|
|
return;
|
|
|
|
llvm::MDBuilder MDHelper(getLLVMContext());
|
|
llvm::MDNode *Node = MDHelper.createFPMath(Accuracy);
|
|
|
|
cast<llvm::Instruction>(Val)->setMetadata(llvm::LLVMContext::MD_fpmath, Node);
|
|
}
|
|
|
|
namespace {
|
|
struct LValueOrRValue {
|
|
LValue LV;
|
|
RValue RV;
|
|
};
|
|
}
|
|
|
|
static LValueOrRValue emitPseudoObjectExpr(CodeGenFunction &CGF,
|
|
const PseudoObjectExpr *E,
|
|
bool forLValue,
|
|
AggValueSlot slot) {
|
|
SmallVector<CodeGenFunction::OpaqueValueMappingData, 4> opaques;
|
|
|
|
// Find the result expression, if any.
|
|
const Expr *resultExpr = E->getResultExpr();
|
|
LValueOrRValue result;
|
|
|
|
for (PseudoObjectExpr::const_semantics_iterator
|
|
i = E->semantics_begin(), e = E->semantics_end(); i != e; ++i) {
|
|
const Expr *semantic = *i;
|
|
|
|
// If this semantic expression is an opaque value, bind it
|
|
// to the result of its source expression.
|
|
if (const auto *ov = dyn_cast<OpaqueValueExpr>(semantic)) {
|
|
|
|
// If this is the result expression, we may need to evaluate
|
|
// directly into the slot.
|
|
typedef CodeGenFunction::OpaqueValueMappingData OVMA;
|
|
OVMA opaqueData;
|
|
if (ov == resultExpr && ov->isRValue() && !forLValue &&
|
|
CodeGenFunction::hasAggregateEvaluationKind(ov->getType())) {
|
|
CGF.EmitAggExpr(ov->getSourceExpr(), slot);
|
|
|
|
LValue LV = CGF.MakeAddrLValue(slot.getAddress(), ov->getType(),
|
|
AlignmentSource::Decl);
|
|
opaqueData = OVMA::bind(CGF, ov, LV);
|
|
result.RV = slot.asRValue();
|
|
|
|
// Otherwise, emit as normal.
|
|
} else {
|
|
opaqueData = OVMA::bind(CGF, ov, ov->getSourceExpr());
|
|
|
|
// If this is the result, also evaluate the result now.
|
|
if (ov == resultExpr) {
|
|
if (forLValue)
|
|
result.LV = CGF.EmitLValue(ov);
|
|
else
|
|
result.RV = CGF.EmitAnyExpr(ov, slot);
|
|
}
|
|
}
|
|
|
|
opaques.push_back(opaqueData);
|
|
|
|
// Otherwise, if the expression is the result, evaluate it
|
|
// and remember the result.
|
|
} else if (semantic == resultExpr) {
|
|
if (forLValue)
|
|
result.LV = CGF.EmitLValue(semantic);
|
|
else
|
|
result.RV = CGF.EmitAnyExpr(semantic, slot);
|
|
|
|
// Otherwise, evaluate the expression in an ignored context.
|
|
} else {
|
|
CGF.EmitIgnoredExpr(semantic);
|
|
}
|
|
}
|
|
|
|
// Unbind all the opaques now.
|
|
for (unsigned i = 0, e = opaques.size(); i != e; ++i)
|
|
opaques[i].unbind(CGF);
|
|
|
|
return result;
|
|
}
|
|
|
|
RValue CodeGenFunction::EmitPseudoObjectRValue(const PseudoObjectExpr *E,
|
|
AggValueSlot slot) {
|
|
return emitPseudoObjectExpr(*this, E, false, slot).RV;
|
|
}
|
|
|
|
LValue CodeGenFunction::EmitPseudoObjectLValue(const PseudoObjectExpr *E) {
|
|
return emitPseudoObjectExpr(*this, E, true, AggValueSlot::ignored()).LV;
|
|
}
|