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

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//===--- Sema.cpp - AST Builder and Semantic Analysis Implementation ------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements the actions class which performs semantic analysis and
// builds an AST out of a parse stream.
//
//===----------------------------------------------------------------------===//
#include "clang/Sema/SemaInternal.h"
#include "clang/Sema/DelayedDiagnostic.h"
#include "TargetAttributesSema.h"
#include "llvm/ADT/DenseMap.h"
#include "llvm/ADT/SmallSet.h"
#include "llvm/ADT/APFloat.h"
#include "clang/Sema/CXXFieldCollector.h"
#include "clang/Sema/TemplateDeduction.h"
#include "clang/Sema/ExternalSemaSource.h"
#include "clang/Sema/ObjCMethodList.h"
#include "clang/Sema/PrettyDeclStackTrace.h"
#include "clang/Sema/Scope.h"
#include "clang/Sema/ScopeInfo.h"
#include "clang/Sema/SemaConsumer.h"
#include "clang/AST/ASTContext.h"
#include "clang/AST/ASTDiagnostic.h"
#include "clang/AST/DeclCXX.h"
#include "clang/AST/DeclObjC.h"
#include "clang/AST/Expr.h"
#include "clang/AST/ExprCXX.h"
#include "clang/AST/StmtCXX.h"
#include "clang/Lex/Preprocessor.h"
#include "clang/Basic/PartialDiagnostic.h"
#include "clang/Basic/TargetInfo.h"
using namespace clang;
using namespace sema;
FunctionScopeInfo::~FunctionScopeInfo() { }
void FunctionScopeInfo::Clear() {
HasBranchProtectedScope = false;
HasBranchIntoScope = false;
HasIndirectGoto = false;
SwitchStack.clear();
Returns.clear();
ErrorTrap.reset();
PossiblyUnreachableDiags.clear();
}
BlockScopeInfo::~BlockScopeInfo() { }
void Sema::ActOnTranslationUnitScope(Scope *S) {
TUScope = S;
PushDeclContext(S, Context.getTranslationUnitDecl());
VAListTagName = PP.getIdentifierInfo("__va_list_tag");
if (PP.getLangOptions().ObjC1) {
// Synthesize "@class Protocol;
if (Context.getObjCProtoType().isNull()) {
ObjCInterfaceDecl *ProtocolDecl =
ObjCInterfaceDecl::Create(Context, CurContext, SourceLocation(),
&Context.Idents.get("Protocol"),
SourceLocation(), true);
Context.setObjCProtoType(Context.getObjCInterfaceType(ProtocolDecl));
PushOnScopeChains(ProtocolDecl, TUScope, false);
}
}
}
Sema::Sema(Preprocessor &pp, ASTContext &ctxt, ASTConsumer &consumer,
TranslationUnitKind TUKind,
CodeCompleteConsumer *CodeCompleter)
: TheTargetAttributesSema(0), FPFeatures(pp.getLangOptions()),
LangOpts(pp.getLangOptions()), PP(pp), Context(ctxt), Consumer(consumer),
Diags(PP.getDiagnostics()), SourceMgr(PP.getSourceManager()),
CollectStats(false), ExternalSource(0), CodeCompleter(CodeCompleter),
CurContext(0), PackContext(0), MSStructPragmaOn(false), VisContext(0),
ExprNeedsCleanups(0), LateTemplateParser(0), OpaqueParser(0),
IdResolver(pp.getLangOptions()), CXXTypeInfoDecl(0), MSVCGuidDecl(0),
GlobalNewDeleteDeclared(false),
ObjCShouldCallSuperDealloc(false),
ObjCShouldCallSuperFinalize(false),
TUKind(TUKind),
NumSFINAEErrors(0), SuppressAccessChecking(false),
AccessCheckingSFINAE(false), InNonInstantiationSFINAEContext(false),
NonInstantiationEntries(0), ArgumentPackSubstitutionIndex(-1),
CurrentInstantiationScope(0), TyposCorrected(0),
AnalysisWarnings(*this)
{
TUScope = 0;
LoadedExternalKnownNamespaces = false;
if (getLangOptions().CPlusPlus)
FieldCollector.reset(new CXXFieldCollector());
// Tell diagnostics how to render things from the AST library.
PP.getDiagnostics().SetArgToStringFn(&FormatASTNodeDiagnosticArgument,
&Context);
ExprEvalContexts.push_back(
ExpressionEvaluationContextRecord(PotentiallyEvaluated, 0, false));
FunctionScopes.push_back(new FunctionScopeInfo(Diags));
}
void Sema::Initialize() {
// Tell the AST consumer about this Sema object.
Consumer.Initialize(Context);
// FIXME: Isn't this redundant with the initialization above?
if (SemaConsumer *SC = dyn_cast<SemaConsumer>(&Consumer))
SC->InitializeSema(*this);
// Tell the external Sema source about this Sema object.
if (ExternalSemaSource *ExternalSema
= dyn_cast_or_null<ExternalSemaSource>(Context.getExternalSource()))
ExternalSema->InitializeSema(*this);
// Initialize predefined 128-bit integer types, if needed.
if (PP.getTargetInfo().getPointerWidth(0) >= 64) {
// If either of the 128-bit integer types are unavailable to name lookup,
// define them now.
DeclarationName Int128 = &Context.Idents.get("__int128_t");
if (IdentifierResolver::begin(Int128) == IdentifierResolver::end())
PushOnScopeChains(Context.getInt128Decl(), TUScope);
DeclarationName UInt128 = &Context.Idents.get("__uint128_t");
if (IdentifierResolver::begin(UInt128) == IdentifierResolver::end())
PushOnScopeChains(Context.getUInt128Decl(), TUScope);
}
// Initialize predefined Objective-C types:
if (PP.getLangOptions().ObjC1) {
// If 'SEL' does not yet refer to any declarations, make it refer to the
// predefined 'SEL'.
DeclarationName SEL = &Context.Idents.get("SEL");
if (IdentifierResolver::begin(SEL) == IdentifierResolver::end())
PushOnScopeChains(Context.getObjCSelDecl(), TUScope);
// If 'id' does not yet refer to any declarations, make it refer to the
// predefined 'id'.
DeclarationName Id = &Context.Idents.get("id");
if (IdentifierResolver::begin(Id) == IdentifierResolver::end())
PushOnScopeChains(Context.getObjCIdDecl(), TUScope);
// Create the built-in typedef for 'Class'.
DeclarationName Class = &Context.Idents.get("Class");
if (IdentifierResolver::begin(Class) == IdentifierResolver::end())
PushOnScopeChains(Context.getObjCClassDecl(), TUScope);
}
}
Sema::~Sema() {
if (PackContext) FreePackedContext();
if (VisContext) FreeVisContext();
delete TheTargetAttributesSema;
MSStructPragmaOn = false;
// Kill all the active scopes.
for (unsigned I = 1, E = FunctionScopes.size(); I != E; ++I)
delete FunctionScopes[I];
if (FunctionScopes.size() == 1)
delete FunctionScopes[0];
// Tell the SemaConsumer to forget about us; we're going out of scope.
if (SemaConsumer *SC = dyn_cast<SemaConsumer>(&Consumer))
SC->ForgetSema();
// Detach from the external Sema source.
if (ExternalSemaSource *ExternalSema
= dyn_cast_or_null<ExternalSemaSource>(Context.getExternalSource()))
ExternalSema->ForgetSema();
}
/// makeUnavailableInSystemHeader - There is an error in the current
/// context. If we're still in a system header, and we can plausibly
/// make the relevant declaration unavailable instead of erroring, do
/// so and return true.
bool Sema::makeUnavailableInSystemHeader(SourceLocation loc,
StringRef msg) {
// If we're not in a function, it's an error.
FunctionDecl *fn = dyn_cast<FunctionDecl>(CurContext);
if (!fn) return false;
// If we're in template instantiation, it's an error.
if (!ActiveTemplateInstantiations.empty())
return false;
// If that function's not in a system header, it's an error.
if (!Context.getSourceManager().isInSystemHeader(loc))
return false;
// If the function is already unavailable, it's not an error.
if (fn->hasAttr<UnavailableAttr>()) return true;
fn->addAttr(new (Context) UnavailableAttr(loc, Context, msg));
return true;
}
ASTMutationListener *Sema::getASTMutationListener() const {
return getASTConsumer().GetASTMutationListener();
}
/// \brief Print out statistics about the semantic analysis.
void Sema::PrintStats() const {
llvm::errs() << "\n*** Semantic Analysis Stats:\n";
llvm::errs() << NumSFINAEErrors << " SFINAE diagnostics trapped.\n";
BumpAlloc.PrintStats();
AnalysisWarnings.PrintStats();
}
/// ImpCastExprToType - If Expr is not of type 'Type', insert an implicit cast.
/// If there is already an implicit cast, merge into the existing one.
/// The result is of the given category.
ExprResult Sema::ImpCastExprToType(Expr *E, QualType Ty,
CastKind Kind, ExprValueKind VK,
const CXXCastPath *BasePath,
CheckedConversionKind CCK) {
QualType ExprTy = Context.getCanonicalType(E->getType());
QualType TypeTy = Context.getCanonicalType(Ty);
if (ExprTy == TypeTy)
return Owned(E);
if (getLangOptions().ObjCAutoRefCount)
CheckObjCARCConversion(SourceRange(), Ty, E, CCK);
// If this is a derived-to-base cast to a through a virtual base, we
// need a vtable.
if (Kind == CK_DerivedToBase &&
BasePathInvolvesVirtualBase(*BasePath)) {
QualType T = E->getType();
if (const PointerType *Pointer = T->getAs<PointerType>())
T = Pointer->getPointeeType();
if (const RecordType *RecordTy = T->getAs<RecordType>())
MarkVTableUsed(E->getLocStart(),
cast<CXXRecordDecl>(RecordTy->getDecl()));
}
if (ImplicitCastExpr *ImpCast = dyn_cast<ImplicitCastExpr>(E)) {
if (ImpCast->getCastKind() == Kind && (!BasePath || BasePath->empty())) {
ImpCast->setType(Ty);
ImpCast->setValueKind(VK);
return Owned(E);
}
}
return Owned(ImplicitCastExpr::Create(Context, Ty, Kind, E, BasePath, VK));
}
/// ScalarTypeToBooleanCastKind - Returns the cast kind corresponding
/// to the conversion from scalar type ScalarTy to the Boolean type.
CastKind Sema::ScalarTypeToBooleanCastKind(QualType ScalarTy) {
switch (ScalarTy->getScalarTypeKind()) {
case Type::STK_Bool: return CK_NoOp;
case Type::STK_CPointer: return CK_PointerToBoolean;
case Type::STK_BlockPointer: return CK_PointerToBoolean;
case Type::STK_ObjCObjectPointer: return CK_PointerToBoolean;
case Type::STK_MemberPointer: return CK_MemberPointerToBoolean;
case Type::STK_Integral: return CK_IntegralToBoolean;
case Type::STK_Floating: return CK_FloatingToBoolean;
case Type::STK_IntegralComplex: return CK_IntegralComplexToBoolean;
case Type::STK_FloatingComplex: return CK_FloatingComplexToBoolean;
}
return CK_Invalid;
}
ExprValueKind Sema::CastCategory(Expr *E) {
Expr::Classification Classification = E->Classify(Context);
return Classification.isRValue() ? VK_RValue :
(Classification.isLValue() ? VK_LValue : VK_XValue);
}
/// \brief Used to prune the decls of Sema's UnusedFileScopedDecls vector.
static bool ShouldRemoveFromUnused(Sema *SemaRef, const DeclaratorDecl *D) {
if (D->isUsed())
return true;
if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
// UnusedFileScopedDecls stores the first declaration.
// The declaration may have become definition so check again.
const FunctionDecl *DeclToCheck;
if (FD->hasBody(DeclToCheck))
return !SemaRef->ShouldWarnIfUnusedFileScopedDecl(DeclToCheck);
// Later redecls may add new information resulting in not having to warn,
// so check again.
DeclToCheck = FD->getMostRecentDeclaration();
if (DeclToCheck != FD)
return !SemaRef->ShouldWarnIfUnusedFileScopedDecl(DeclToCheck);
}
if (const VarDecl *VD = dyn_cast<VarDecl>(D)) {
// UnusedFileScopedDecls stores the first declaration.
// The declaration may have become definition so check again.
const VarDecl *DeclToCheck = VD->getDefinition();
if (DeclToCheck)
return !SemaRef->ShouldWarnIfUnusedFileScopedDecl(DeclToCheck);
// Later redecls may add new information resulting in not having to warn,
// so check again.
DeclToCheck = VD->getMostRecentDeclaration();
if (DeclToCheck != VD)
return !SemaRef->ShouldWarnIfUnusedFileScopedDecl(DeclToCheck);
}
return false;
}
namespace {
struct UndefinedInternal {
NamedDecl *decl;
FullSourceLoc useLoc;
UndefinedInternal(NamedDecl *decl, FullSourceLoc useLoc)
: decl(decl), useLoc(useLoc) {}
};
bool operator<(const UndefinedInternal &l, const UndefinedInternal &r) {
return l.useLoc.isBeforeInTranslationUnitThan(r.useLoc);
}
}
/// checkUndefinedInternals - Check for undefined objects with internal linkage.
static void checkUndefinedInternals(Sema &S) {
if (S.UndefinedInternals.empty()) return;
// Collect all the still-undefined entities with internal linkage.
SmallVector<UndefinedInternal, 16> undefined;
for (llvm::DenseMap<NamedDecl*,SourceLocation>::iterator
i = S.UndefinedInternals.begin(), e = S.UndefinedInternals.end();
i != e; ++i) {
NamedDecl *decl = i->first;
// Ignore attributes that have become invalid.
if (decl->isInvalidDecl()) continue;
// __attribute__((weakref)) is basically a definition.
if (decl->hasAttr<WeakRefAttr>()) continue;
if (FunctionDecl *fn = dyn_cast<FunctionDecl>(decl)) {
if (fn->isPure() || fn->hasBody())
continue;
} else {
if (cast<VarDecl>(decl)->hasDefinition() != VarDecl::DeclarationOnly)
continue;
}
// We build a FullSourceLoc so that we can sort with array_pod_sort.
FullSourceLoc loc(i->second, S.Context.getSourceManager());
undefined.push_back(UndefinedInternal(decl, loc));
}
if (undefined.empty()) return;
// Sort (in order of use site) so that we're not (as) dependent on
// the iteration order through an llvm::DenseMap.
llvm::array_pod_sort(undefined.begin(), undefined.end());
for (SmallVectorImpl<UndefinedInternal>::iterator
i = undefined.begin(), e = undefined.end(); i != e; ++i) {
NamedDecl *decl = i->decl;
S.Diag(decl->getLocation(), diag::warn_undefined_internal)
<< isa<VarDecl>(decl) << decl;
S.Diag(i->useLoc, diag::note_used_here);
}
}
void Sema::LoadExternalWeakUndeclaredIdentifiers() {
if (!ExternalSource)
return;
SmallVector<std::pair<IdentifierInfo *, WeakInfo>, 4> WeakIDs;
ExternalSource->ReadWeakUndeclaredIdentifiers(WeakIDs);
for (unsigned I = 0, N = WeakIDs.size(); I != N; ++I) {
llvm::DenseMap<IdentifierInfo*,WeakInfo>::iterator Pos
= WeakUndeclaredIdentifiers.find(WeakIDs[I].first);
if (Pos != WeakUndeclaredIdentifiers.end())
continue;
WeakUndeclaredIdentifiers.insert(WeakIDs[I]);
}
}
/// ActOnEndOfTranslationUnit - This is called at the very end of the
/// translation unit when EOF is reached and all but the top-level scope is
/// popped.
void Sema::ActOnEndOfTranslationUnit() {
// Only complete translation units define vtables and perform implicit
// instantiations.
if (TUKind == TU_Complete) {
// If any dynamic classes have their key function defined within
// this translation unit, then those vtables are considered "used" and must
// be emitted.
for (DynamicClassesType::iterator I = DynamicClasses.begin(ExternalSource),
E = DynamicClasses.end();
I != E; ++I) {
assert(!(*I)->isDependentType() &&
"Should not see dependent types here!");
if (const CXXMethodDecl *KeyFunction = Context.getKeyFunction(*I)) {
const FunctionDecl *Definition = 0;
if (KeyFunction->hasBody(Definition))
MarkVTableUsed(Definition->getLocation(), *I, true);
}
}
// If DefinedUsedVTables ends up marking any virtual member functions it
// might lead to more pending template instantiations, which we then need
// to instantiate.
DefineUsedVTables();
// C++: Perform implicit template instantiations.
//
// FIXME: When we perform these implicit instantiations, we do not
// carefully keep track of the point of instantiation (C++ [temp.point]).
// This means that name lookup that occurs within the template
// instantiation will always happen at the end of the translation unit,
// so it will find some names that should not be found. Although this is
// common behavior for C++ compilers, it is technically wrong. In the
// future, we either need to be able to filter the results of name lookup
// or we need to perform template instantiations earlier.
PerformPendingInstantiations();
}
// Remove file scoped decls that turned out to be used.
UnusedFileScopedDecls.erase(std::remove_if(UnusedFileScopedDecls.begin(0,
true),
UnusedFileScopedDecls.end(),
std::bind1st(std::ptr_fun(ShouldRemoveFromUnused),
this)),
UnusedFileScopedDecls.end());
if (TUKind == TU_Prefix) {
// Translation unit prefixes don't need any of the checking below.
TUScope = 0;
return;
}
// Check for #pragma weak identifiers that were never declared
// FIXME: This will cause diagnostics to be emitted in a non-determinstic
// order! Iterating over a densemap like this is bad.
LoadExternalWeakUndeclaredIdentifiers();
for (llvm::DenseMap<IdentifierInfo*,WeakInfo>::iterator
I = WeakUndeclaredIdentifiers.begin(),
E = WeakUndeclaredIdentifiers.end(); I != E; ++I) {
if (I->second.getUsed()) continue;
Diag(I->second.getLocation(), diag::warn_weak_identifier_undeclared)
<< I->first;
}
if (TUKind == TU_Module) {
// Modules don't need any of the checking below.
TUScope = 0;
return;
}
// C99 6.9.2p2:
// A declaration of an identifier for an object that has file
// scope without an initializer, and without a storage-class
// specifier or with the storage-class specifier static,
// constitutes a tentative definition. If a translation unit
// contains one or more tentative definitions for an identifier,
// and the translation unit contains no external definition for
// that identifier, then the behavior is exactly as if the
// translation unit contains a file scope declaration of that
// identifier, with the composite type as of the end of the
// translation unit, with an initializer equal to 0.
llvm::SmallSet<VarDecl *, 32> Seen;
for (TentativeDefinitionsType::iterator
T = TentativeDefinitions.begin(ExternalSource),
TEnd = TentativeDefinitions.end();
T != TEnd; ++T)
{
VarDecl *VD = (*T)->getActingDefinition();
// If the tentative definition was completed, getActingDefinition() returns
// null. If we've already seen this variable before, insert()'s second
// return value is false.
if (VD == 0 || VD->isInvalidDecl() || !Seen.insert(VD))
continue;
if (const IncompleteArrayType *ArrayT
= Context.getAsIncompleteArrayType(VD->getType())) {
if (RequireCompleteType(VD->getLocation(),
ArrayT->getElementType(),
diag::err_tentative_def_incomplete_type_arr)) {
VD->setInvalidDecl();
continue;
}
// Set the length of the array to 1 (C99 6.9.2p5).
Diag(VD->getLocation(), diag::warn_tentative_incomplete_array);
llvm::APInt One(Context.getTypeSize(Context.getSizeType()), true);
QualType T = Context.getConstantArrayType(ArrayT->getElementType(),
One, ArrayType::Normal, 0);
VD->setType(T);
} else if (RequireCompleteType(VD->getLocation(), VD->getType(),
diag::err_tentative_def_incomplete_type))
VD->setInvalidDecl();
// Notify the consumer that we've completed a tentative definition.
if (!VD->isInvalidDecl())
Consumer.CompleteTentativeDefinition(VD);
}
if (LangOpts.CPlusPlus0x &&
Diags.getDiagnosticLevel(diag::warn_delegating_ctor_cycle,
SourceLocation())
!= Diagnostic::Ignored)
CheckDelegatingCtorCycles();
// If there were errors, disable 'unused' warnings since they will mostly be
// noise.
if (!Diags.hasErrorOccurred()) {
// Output warning for unused file scoped decls.
for (UnusedFileScopedDeclsType::iterator
I = UnusedFileScopedDecls.begin(ExternalSource),
E = UnusedFileScopedDecls.end(); I != E; ++I) {
if (ShouldRemoveFromUnused(this, *I))
continue;
if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(*I)) {
const FunctionDecl *DiagD;
if (!FD->hasBody(DiagD))
DiagD = FD;
if (DiagD->isDeleted())
continue; // Deleted functions are supposed to be unused.
if (DiagD->isReferenced()) {
if (isa<CXXMethodDecl>(DiagD))
Diag(DiagD->getLocation(), diag::warn_unneeded_member_function)
<< DiagD->getDeclName();
else
Diag(DiagD->getLocation(), diag::warn_unneeded_internal_decl)
<< /*function*/0 << DiagD->getDeclName();
} else {
Diag(DiagD->getLocation(),
isa<CXXMethodDecl>(DiagD) ? diag::warn_unused_member_function
: diag::warn_unused_function)
<< DiagD->getDeclName();
}
} else {
const VarDecl *DiagD = cast<VarDecl>(*I)->getDefinition();
if (!DiagD)
DiagD = cast<VarDecl>(*I);
if (DiagD->isReferenced()) {
Diag(DiagD->getLocation(), diag::warn_unneeded_internal_decl)
<< /*variable*/1 << DiagD->getDeclName();
} else {
Diag(DiagD->getLocation(), diag::warn_unused_variable)
<< DiagD->getDeclName();
}
}
}
checkUndefinedInternals(*this);
}
// Check we've noticed that we're no longer parsing the initializer for every
// variable. If we miss cases, then at best we have a performance issue and
// at worst a rejects-valid bug.
assert(ParsingInitForAutoVars.empty() &&
"Didn't unmark var as having its initializer parsed");
TUScope = 0;
}
//===----------------------------------------------------------------------===//
// Helper functions.
//===----------------------------------------------------------------------===//
DeclContext *Sema::getFunctionLevelDeclContext() {
DeclContext *DC = CurContext;
while (isa<BlockDecl>(DC) || isa<EnumDecl>(DC))
DC = DC->getParent();
return DC;
}
/// getCurFunctionDecl - If inside of a function body, this returns a pointer
/// to the function decl for the function being parsed. If we're currently
/// in a 'block', this returns the containing context.
FunctionDecl *Sema::getCurFunctionDecl() {
DeclContext *DC = getFunctionLevelDeclContext();
return dyn_cast<FunctionDecl>(DC);
}
ObjCMethodDecl *Sema::getCurMethodDecl() {
DeclContext *DC = getFunctionLevelDeclContext();
return dyn_cast<ObjCMethodDecl>(DC);
}
NamedDecl *Sema::getCurFunctionOrMethodDecl() {
DeclContext *DC = getFunctionLevelDeclContext();
if (isa<ObjCMethodDecl>(DC) || isa<FunctionDecl>(DC))
return cast<NamedDecl>(DC);
return 0;
}
Sema::SemaDiagnosticBuilder::~SemaDiagnosticBuilder() {
if (!isActive())
return;
if (llvm::Optional<TemplateDeductionInfo*> Info = SemaRef.isSFINAEContext()) {
switch (DiagnosticIDs::getDiagnosticSFINAEResponse(getDiagID())) {
case DiagnosticIDs::SFINAE_Report:
// Fall through; we'll report the diagnostic below.
break;
case DiagnosticIDs::SFINAE_AccessControl:
// Per C++ Core Issue 1170, access control is part of SFINAE.
// Additionally, the AccessCheckingSFINAE flag can be used to temporary
// make access control a part of SFINAE for the purposes of checking
// type traits.
if (!SemaRef.AccessCheckingSFINAE &&
!SemaRef.getLangOptions().CPlusPlus0x)
break;
case DiagnosticIDs::SFINAE_SubstitutionFailure:
// Count this failure so that we know that template argument deduction
// has failed.
++SemaRef.NumSFINAEErrors;
SemaRef.Diags.setLastDiagnosticIgnored();
SemaRef.Diags.Clear();
Clear();
return;
case DiagnosticIDs::SFINAE_Suppress:
// Make a copy of this suppressed diagnostic and store it with the
// template-deduction information;
FlushCounts();
DiagnosticInfo DiagInfo(&SemaRef.Diags);
if (*Info)
(*Info)->addSuppressedDiagnostic(DiagInfo.getLocation(),
PartialDiagnostic(DiagInfo,
SemaRef.Context.getDiagAllocator()));
// Suppress this diagnostic.
SemaRef.Diags.setLastDiagnosticIgnored();
SemaRef.Diags.Clear();
Clear();
return;
}
}
// Emit the diagnostic.
if (!this->Emit())
return;
// If this is not a note, and we're in a template instantiation
// that is different from the last template instantiation where
// we emitted an error, print a template instantiation
// backtrace.
if (!DiagnosticIDs::isBuiltinNote(DiagID) &&
!SemaRef.ActiveTemplateInstantiations.empty() &&
SemaRef.ActiveTemplateInstantiations.back()
!= SemaRef.LastTemplateInstantiationErrorContext) {
SemaRef.PrintInstantiationStack();
SemaRef.LastTemplateInstantiationErrorContext
= SemaRef.ActiveTemplateInstantiations.back();
}
}
Sema::SemaDiagnosticBuilder Sema::Diag(SourceLocation Loc, unsigned DiagID) {
DiagnosticBuilder DB = Diags.Report(Loc, DiagID);
return SemaDiagnosticBuilder(DB, *this, DiagID);
}
Sema::SemaDiagnosticBuilder
Sema::Diag(SourceLocation Loc, const PartialDiagnostic& PD) {
SemaDiagnosticBuilder Builder(Diag(Loc, PD.getDiagID()));
PD.Emit(Builder);
return Builder;
}
/// \brief Looks through the macro-expansion chain for the given
/// location, looking for a macro expansion with the given name.
/// If one is found, returns true and sets the location to that
/// expansion loc.
bool Sema::findMacroSpelling(SourceLocation &locref, StringRef name) {
SourceLocation loc = locref;
if (!loc.isMacroID()) return false;
// There's no good way right now to look at the intermediate
// expansions, so just jump to the expansion location.
loc = getSourceManager().getExpansionLoc(loc);
// If that's written with the name, stop here.
SmallVector<char, 16> buffer;
if (getPreprocessor().getSpelling(loc, buffer) == name) {
locref = loc;
return true;
}
return false;
}
/// \brief Determines the active Scope associated with the given declaration
/// context.
///
/// This routine maps a declaration context to the active Scope object that
/// represents that declaration context in the parser. It is typically used
/// from "scope-less" code (e.g., template instantiation, lazy creation of
/// declarations) that injects a name for name-lookup purposes and, therefore,
/// must update the Scope.
///
/// \returns The scope corresponding to the given declaraion context, or NULL
/// if no such scope is open.
Scope *Sema::getScopeForContext(DeclContext *Ctx) {
if (!Ctx)
return 0;
Ctx = Ctx->getPrimaryContext();
for (Scope *S = getCurScope(); S; S = S->getParent()) {
// Ignore scopes that cannot have declarations. This is important for
// out-of-line definitions of static class members.
if (S->getFlags() & (Scope::DeclScope | Scope::TemplateParamScope))
if (DeclContext *Entity = static_cast<DeclContext *> (S->getEntity()))
if (Ctx == Entity->getPrimaryContext())
return S;
}
return 0;
}
/// \brief Enter a new function scope
void Sema::PushFunctionScope() {
if (FunctionScopes.size() == 1) {
// Use the "top" function scope rather than having to allocate
// memory for a new scope.
FunctionScopes.back()->Clear();
FunctionScopes.push_back(FunctionScopes.back());
return;
}
FunctionScopes.push_back(new FunctionScopeInfo(getDiagnostics()));
}
void Sema::PushBlockScope(Scope *BlockScope, BlockDecl *Block) {
FunctionScopes.push_back(new BlockScopeInfo(getDiagnostics(),
BlockScope, Block));
}
void Sema::PopFunctionOrBlockScope(const AnalysisBasedWarnings::Policy *WP,
const Decl *D, const BlockExpr *blkExpr) {
FunctionScopeInfo *Scope = FunctionScopes.pop_back_val();
assert(!FunctionScopes.empty() && "mismatched push/pop!");
// Issue any analysis-based warnings.
if (WP && D)
AnalysisWarnings.IssueWarnings(*WP, Scope, D, blkExpr);
else {
for (SmallVectorImpl<sema::PossiblyUnreachableDiag>::iterator
i = Scope->PossiblyUnreachableDiags.begin(),
e = Scope->PossiblyUnreachableDiags.end();
i != e; ++i) {
const sema::PossiblyUnreachableDiag &D = *i;
Diag(D.Loc, D.PD);
}
}
if (FunctionScopes.back() != Scope) {
delete Scope;
}
}
/// \brief Determine whether any errors occurred within this function/method/
/// block.
bool Sema::hasAnyUnrecoverableErrorsInThisFunction() const {
return getCurFunction()->ErrorTrap.hasUnrecoverableErrorOccurred();
}
BlockScopeInfo *Sema::getCurBlock() {
if (FunctionScopes.empty())
return 0;
return dyn_cast<BlockScopeInfo>(FunctionScopes.back());
}
// Pin this vtable to this file.
ExternalSemaSource::~ExternalSemaSource() {}
std::pair<ObjCMethodList, ObjCMethodList>
ExternalSemaSource::ReadMethodPool(Selector Sel) {
return std::pair<ObjCMethodList, ObjCMethodList>();
}
void ExternalSemaSource::ReadKnownNamespaces(
SmallVectorImpl<NamespaceDecl *> &Namespaces) {
}
void PrettyDeclStackTraceEntry::print(raw_ostream &OS) const {
SourceLocation Loc = this->Loc;
if (!Loc.isValid() && TheDecl) Loc = TheDecl->getLocation();
if (Loc.isValid()) {
Loc.print(OS, S.getSourceManager());
OS << ": ";
}
OS << Message;
if (TheDecl && isa<NamedDecl>(TheDecl)) {
std::string Name = cast<NamedDecl>(TheDecl)->getNameAsString();
if (!Name.empty())
OS << " '" << Name << '\'';
}
OS << '\n';
}
/// \brief Figure out if an expression could be turned into a call.
///
/// Use this when trying to recover from an error where the programmer may have
/// written just the name of a function instead of actually calling it.
///
/// \param E - The expression to examine.
/// \param ZeroArgCallReturnTy - If the expression can be turned into a call
/// with no arguments, this parameter is set to the type returned by such a
/// call; otherwise, it is set to an empty QualType.
/// \param NonTemplateOverloads - If the expression is an overloaded function
/// name, this parameter is populated with the decls of the various overloads.
bool Sema::isExprCallable(const Expr &E, QualType &ZeroArgCallReturnTy,
UnresolvedSetImpl &NonTemplateOverloads) {
ZeroArgCallReturnTy = QualType();
NonTemplateOverloads.clear();
if (const OverloadExpr *Overloads = dyn_cast<OverloadExpr>(&E)) {
for (OverloadExpr::decls_iterator it = Overloads->decls_begin(),
DeclsEnd = Overloads->decls_end(); it != DeclsEnd; ++it) {
// Our overload set may include TemplateDecls, which we'll ignore for our
// present purpose.
if (const FunctionDecl *OverloadDecl = dyn_cast<FunctionDecl>(*it)) {
NonTemplateOverloads.addDecl(*it);
if (OverloadDecl->getMinRequiredArguments() == 0)
ZeroArgCallReturnTy = OverloadDecl->getResultType();
}
}
return true;
}
if (const DeclRefExpr *DeclRef = dyn_cast<DeclRefExpr>(&E)) {
if (const FunctionDecl *Fun = dyn_cast<FunctionDecl>(DeclRef->getDecl())) {
if (Fun->getMinRequiredArguments() == 0)
ZeroArgCallReturnTy = Fun->getResultType();
return true;
}
}
// We don't have an expression that's convenient to get a FunctionDecl from,
// but we can at least check if the type is "function of 0 arguments".
QualType ExprTy = E.getType();
const FunctionType *FunTy = NULL;
QualType PointeeTy = ExprTy->getPointeeType();
if (!PointeeTy.isNull())
FunTy = PointeeTy->getAs<FunctionType>();
if (!FunTy)
FunTy = ExprTy->getAs<FunctionType>();
if (!FunTy && ExprTy == Context.BoundMemberTy) {
// Look for the bound-member type. If it's still overloaded, give up,
// although we probably should have fallen into the OverloadExpr case above
// if we actually have an overloaded bound member.
QualType BoundMemberTy = Expr::findBoundMemberType(&E);
if (!BoundMemberTy.isNull())
FunTy = BoundMemberTy->castAs<FunctionType>();
}
if (const FunctionProtoType *FPT =
dyn_cast_or_null<FunctionProtoType>(FunTy)) {
if (FPT->getNumArgs() == 0)
ZeroArgCallReturnTy = FunTy->getResultType();
return true;
}
return false;
}
/// \brief Give notes for a set of overloads.
///
/// A companion to isExprCallable. In cases when the name that the programmer
/// wrote was an overloaded function, we may be able to make some guesses about
/// plausible overloads based on their return types; such guesses can be handed
/// off to this method to be emitted as notes.
///
/// \param Overloads - The overloads to note.
/// \param FinalNoteLoc - If we've suppressed printing some overloads due to
/// -fshow-overloads=best, this is the location to attach to the note about too
/// many candidates. Typically this will be the location of the original
/// ill-formed expression.
void Sema::NoteOverloads(const UnresolvedSetImpl &Overloads,
const SourceLocation FinalNoteLoc) {
int ShownOverloads = 0;
int SuppressedOverloads = 0;
for (UnresolvedSetImpl::iterator It = Overloads.begin(),
DeclsEnd = Overloads.end(); It != DeclsEnd; ++It) {
// FIXME: Magic number for max shown overloads stolen from
// OverloadCandidateSet::NoteCandidates.
if (ShownOverloads >= 4 &&
Diags.getShowOverloads() == Diagnostic::Ovl_Best) {
++SuppressedOverloads;
continue;
}
Diag(cast<FunctionDecl>(*It)->getSourceRange().getBegin(),
diag::note_member_ref_possible_intended_overload);
++ShownOverloads;
}
if (SuppressedOverloads)
Diag(FinalNoteLoc, diag::note_ovl_too_many_candidates)
<< SuppressedOverloads;
}
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