1 //===--- Sema.cpp - AST Builder and Semantic Analysis Implementation ------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file implements the actions class which performs semantic analysis and
11 // builds an AST out of a parse stream.
13 //===----------------------------------------------------------------------===//
15 #include "clang/Sema/SemaInternal.h"
16 #include "clang/AST/ASTContext.h"
17 #include "clang/AST/ASTDiagnostic.h"
18 #include "clang/AST/DeclCXX.h"
19 #include "clang/AST/DeclFriend.h"
20 #include "clang/AST/DeclObjC.h"
21 #include "clang/AST/Expr.h"
22 #include "clang/AST/ExprCXX.h"
23 #include "clang/AST/StmtCXX.h"
24 #include "clang/Basic/DiagnosticOptions.h"
25 #include "clang/Basic/FileManager.h"
26 #include "clang/Basic/PartialDiagnostic.h"
27 #include "clang/Basic/TargetInfo.h"
28 #include "clang/Lex/HeaderSearch.h"
29 #include "clang/Lex/Preprocessor.h"
30 #include "clang/Sema/CXXFieldCollector.h"
31 #include "clang/Sema/DelayedDiagnostic.h"
32 #include "clang/Sema/ExternalSemaSource.h"
33 #include "clang/Sema/MultiplexExternalSemaSource.h"
34 #include "clang/Sema/ObjCMethodList.h"
35 #include "clang/Sema/PrettyDeclStackTrace.h"
36 #include "clang/Sema/Scope.h"
37 #include "clang/Sema/ScopeInfo.h"
38 #include "clang/Sema/SemaConsumer.h"
39 #include "clang/Sema/TemplateDeduction.h"
40 #include "llvm/ADT/APFloat.h"
41 #include "llvm/ADT/DenseMap.h"
42 #include "llvm/ADT/SmallSet.h"
43 #include "llvm/Support/CrashRecoveryContext.h"
44 using namespace clang;
47 SourceLocation Sema::getLocForEndOfToken(SourceLocation Loc, unsigned Offset) {
48 return Lexer::getLocForEndOfToken(Loc, Offset, SourceMgr, LangOpts);
51 ModuleLoader &Sema::getModuleLoader() const { return PP.getModuleLoader(); }
53 PrintingPolicy Sema::getPrintingPolicy(const ASTContext &Context,
54 const Preprocessor &PP) {
55 PrintingPolicy Policy = Context.getPrintingPolicy();
56 Policy.Bool = Context.getLangOpts().Bool;
59 BoolMacro = PP.getMacroInfo(&Context.Idents.get("bool"))) {
60 Policy.Bool = BoolMacro->isObjectLike() &&
61 BoolMacro->getNumTokens() == 1 &&
62 BoolMacro->getReplacementToken(0).is(tok::kw__Bool);
69 void Sema::ActOnTranslationUnitScope(Scope *S) {
71 PushDeclContext(S, Context.getTranslationUnitDecl());
74 Sema::Sema(Preprocessor &pp, ASTContext &ctxt, ASTConsumer &consumer,
75 TranslationUnitKind TUKind,
76 CodeCompleteConsumer *CodeCompleter)
77 : ExternalSource(nullptr),
78 isMultiplexExternalSource(false), FPFeatures(pp.getLangOpts()),
79 LangOpts(pp.getLangOpts()), PP(pp), Context(ctxt), Consumer(consumer),
80 Diags(PP.getDiagnostics()), SourceMgr(PP.getSourceManager()),
81 CollectStats(false), CodeCompleter(CodeCompleter),
82 CurContext(nullptr), OriginalLexicalContext(nullptr),
83 PackContext(nullptr), MSStructPragmaOn(false),
84 MSPointerToMemberRepresentationMethod(
85 LangOpts.getMSPointerToMemberRepresentationMethod()),
86 VtorDispModeStack(1, MSVtorDispAttr::Mode(LangOpts.VtorDispMode)),
87 DataSegStack(nullptr), BSSSegStack(nullptr), ConstSegStack(nullptr),
88 CodeSegStack(nullptr), CurInitSeg(nullptr), VisContext(nullptr),
89 IsBuildingRecoveryCallExpr(false),
90 ExprNeedsCleanups(false), LateTemplateParser(nullptr),
91 LateTemplateParserCleanup(nullptr),
92 OpaqueParser(nullptr), IdResolver(pp), StdInitializerList(nullptr),
93 CXXTypeInfoDecl(nullptr), MSVCGuidDecl(nullptr),
94 NSNumberDecl(nullptr),
95 NSStringDecl(nullptr), StringWithUTF8StringMethod(nullptr),
96 NSArrayDecl(nullptr), ArrayWithObjectsMethod(nullptr),
97 NSDictionaryDecl(nullptr), DictionaryWithObjectsMethod(nullptr),
98 MSAsmLabelNameCounter(0),
99 GlobalNewDeleteDeclared(false),
102 CachedFakeTopLevelModule(nullptr),
103 AccessCheckingSFINAE(false), InNonInstantiationSFINAEContext(false),
104 NonInstantiationEntries(0), ArgumentPackSubstitutionIndex(-1),
105 CurrentInstantiationScope(nullptr), DisableTypoCorrection(false),
106 TyposCorrected(0), AnalysisWarnings(*this), ThreadSafetyDeclCache(nullptr),
107 VarDataSharingAttributesStack(nullptr), CurScope(nullptr),
108 Ident_super(nullptr), Ident___float128(nullptr)
112 LoadedExternalKnownNamespaces = false;
113 for (unsigned I = 0; I != NSAPI::NumNSNumberLiteralMethods; ++I)
114 NSNumberLiteralMethods[I] = nullptr;
116 if (getLangOpts().ObjC1)
117 NSAPIObj.reset(new NSAPI(Context));
119 if (getLangOpts().CPlusPlus)
120 FieldCollector.reset(new CXXFieldCollector());
122 // Tell diagnostics how to render things from the AST library.
123 PP.getDiagnostics().SetArgToStringFn(&FormatASTNodeDiagnosticArgument,
126 ExprEvalContexts.emplace_back(PotentiallyEvaluated, 0, false, nullptr, false);
128 FunctionScopes.push_back(new FunctionScopeInfo(Diags));
130 // Initilization of data sharing attributes stack for OpenMP
131 InitDataSharingAttributesStack();
134 void Sema::addImplicitTypedef(StringRef Name, QualType T) {
135 DeclarationName DN = &Context.Idents.get(Name);
136 if (IdResolver.begin(DN) == IdResolver.end())
137 PushOnScopeChains(Context.buildImplicitTypedef(T, Name), TUScope);
140 void Sema::Initialize() {
141 // Tell the AST consumer about this Sema object.
142 Consumer.Initialize(Context);
144 // FIXME: Isn't this redundant with the initialization above?
145 if (SemaConsumer *SC = dyn_cast<SemaConsumer>(&Consumer))
146 SC->InitializeSema(*this);
148 // Tell the external Sema source about this Sema object.
149 if (ExternalSemaSource *ExternalSema
150 = dyn_cast_or_null<ExternalSemaSource>(Context.getExternalSource()))
151 ExternalSema->InitializeSema(*this);
153 // This needs to happen after ExternalSemaSource::InitializeSema(this) or we
154 // will not be able to merge any duplicate __va_list_tag decls correctly.
155 VAListTagName = PP.getIdentifierInfo("__va_list_tag");
157 // Initialize predefined 128-bit integer types, if needed.
158 if (Context.getTargetInfo().hasInt128Type()) {
159 // If either of the 128-bit integer types are unavailable to name lookup,
161 DeclarationName Int128 = &Context.Idents.get("__int128_t");
162 if (IdResolver.begin(Int128) == IdResolver.end())
163 PushOnScopeChains(Context.getInt128Decl(), TUScope);
165 DeclarationName UInt128 = &Context.Idents.get("__uint128_t");
166 if (IdResolver.begin(UInt128) == IdResolver.end())
167 PushOnScopeChains(Context.getUInt128Decl(), TUScope);
171 // Initialize predefined Objective-C types:
172 if (PP.getLangOpts().ObjC1) {
173 // If 'SEL' does not yet refer to any declarations, make it refer to the
175 DeclarationName SEL = &Context.Idents.get("SEL");
176 if (IdResolver.begin(SEL) == IdResolver.end())
177 PushOnScopeChains(Context.getObjCSelDecl(), TUScope);
179 // If 'id' does not yet refer to any declarations, make it refer to the
181 DeclarationName Id = &Context.Idents.get("id");
182 if (IdResolver.begin(Id) == IdResolver.end())
183 PushOnScopeChains(Context.getObjCIdDecl(), TUScope);
185 // Create the built-in typedef for 'Class'.
186 DeclarationName Class = &Context.Idents.get("Class");
187 if (IdResolver.begin(Class) == IdResolver.end())
188 PushOnScopeChains(Context.getObjCClassDecl(), TUScope);
190 // Create the built-in forward declaratino for 'Protocol'.
191 DeclarationName Protocol = &Context.Idents.get("Protocol");
192 if (IdResolver.begin(Protocol) == IdResolver.end())
193 PushOnScopeChains(Context.getObjCProtocolDecl(), TUScope);
196 // Initialize Microsoft "predefined C++ types".
197 if (PP.getLangOpts().MSVCCompat) {
198 if (PP.getLangOpts().CPlusPlus &&
199 IdResolver.begin(&Context.Idents.get("type_info")) == IdResolver.end())
200 PushOnScopeChains(Context.buildImplicitRecord("type_info", TTK_Class),
203 addImplicitTypedef("size_t", Context.getSizeType());
206 // Initialize predefined OpenCL types.
207 if (PP.getLangOpts().OpenCL) {
208 addImplicitTypedef("image1d_t", Context.OCLImage1dTy);
209 addImplicitTypedef("image1d_array_t", Context.OCLImage1dArrayTy);
210 addImplicitTypedef("image1d_buffer_t", Context.OCLImage1dBufferTy);
211 addImplicitTypedef("image2d_t", Context.OCLImage2dTy);
212 addImplicitTypedef("image2d_array_t", Context.OCLImage2dArrayTy);
213 addImplicitTypedef("image3d_t", Context.OCLImage3dTy);
214 addImplicitTypedef("sampler_t", Context.OCLSamplerTy);
215 addImplicitTypedef("event_t", Context.OCLEventTy);
216 if (getLangOpts().OpenCLVersion >= 200) {
217 addImplicitTypedef("atomic_int", Context.getAtomicType(Context.IntTy));
218 addImplicitTypedef("atomic_uint",
219 Context.getAtomicType(Context.UnsignedIntTy));
220 addImplicitTypedef("atomic_long", Context.getAtomicType(Context.LongTy));
221 addImplicitTypedef("atomic_ulong",
222 Context.getAtomicType(Context.UnsignedLongTy));
223 addImplicitTypedef("atomic_float",
224 Context.getAtomicType(Context.FloatTy));
225 addImplicitTypedef("atomic_double",
226 Context.getAtomicType(Context.DoubleTy));
227 // OpenCLC v2.0, s6.13.11.6 requires that atomic_flag is implemented as
228 // 32-bit integer and OpenCLC v2.0, s6.1.1 int is always 32-bit wide.
229 addImplicitTypedef("atomic_flag", Context.getAtomicType(Context.IntTy));
230 addImplicitTypedef("atomic_intptr_t",
231 Context.getAtomicType(Context.getIntPtrType()));
232 addImplicitTypedef("atomic_uintptr_t",
233 Context.getAtomicType(Context.getUIntPtrType()));
234 addImplicitTypedef("atomic_size_t",
235 Context.getAtomicType(Context.getSizeType()));
236 addImplicitTypedef("atomic_ptrdiff_t",
237 Context.getAtomicType(Context.getPointerDiffType()));
241 DeclarationName BuiltinVaList = &Context.Idents.get("__builtin_va_list");
242 if (IdResolver.begin(BuiltinVaList) == IdResolver.end())
243 PushOnScopeChains(Context.getBuiltinVaListDecl(), TUScope);
247 llvm::DeleteContainerSeconds(LateParsedTemplateMap);
248 if (PackContext) FreePackedContext();
249 if (VisContext) FreeVisContext();
250 // Kill all the active scopes.
251 for (unsigned I = 1, E = FunctionScopes.size(); I != E; ++I)
252 delete FunctionScopes[I];
253 if (FunctionScopes.size() == 1)
254 delete FunctionScopes[0];
256 // Tell the SemaConsumer to forget about us; we're going out of scope.
257 if (SemaConsumer *SC = dyn_cast<SemaConsumer>(&Consumer))
260 // Detach from the external Sema source.
261 if (ExternalSemaSource *ExternalSema
262 = dyn_cast_or_null<ExternalSemaSource>(Context.getExternalSource()))
263 ExternalSema->ForgetSema();
265 // If Sema's ExternalSource is the multiplexer - we own it.
266 if (isMultiplexExternalSource)
267 delete ExternalSource;
269 threadSafety::threadSafetyCleanup(ThreadSafetyDeclCache);
271 // Destroys data sharing attributes stack for OpenMP
272 DestroyDataSharingAttributesStack();
274 assert(DelayedTypos.empty() && "Uncorrected typos!");
277 /// makeUnavailableInSystemHeader - There is an error in the current
278 /// context. If we're still in a system header, and we can plausibly
279 /// make the relevant declaration unavailable instead of erroring, do
280 /// so and return true.
281 bool Sema::makeUnavailableInSystemHeader(SourceLocation loc,
283 // If we're not in a function, it's an error.
284 FunctionDecl *fn = dyn_cast<FunctionDecl>(CurContext);
285 if (!fn) return false;
287 // If we're in template instantiation, it's an error.
288 if (!ActiveTemplateInstantiations.empty())
291 // If that function's not in a system header, it's an error.
292 if (!Context.getSourceManager().isInSystemHeader(loc))
295 // If the function is already unavailable, it's not an error.
296 if (fn->hasAttr<UnavailableAttr>()) return true;
298 fn->addAttr(UnavailableAttr::CreateImplicit(Context, msg, loc));
302 ASTMutationListener *Sema::getASTMutationListener() const {
303 return getASTConsumer().GetASTMutationListener();
306 ///\brief Registers an external source. If an external source already exists,
307 /// creates a multiplex external source and appends to it.
309 ///\param[in] E - A non-null external sema source.
311 void Sema::addExternalSource(ExternalSemaSource *E) {
312 assert(E && "Cannot use with NULL ptr");
314 if (!ExternalSource) {
319 if (isMultiplexExternalSource)
320 static_cast<MultiplexExternalSemaSource*>(ExternalSource)->addSource(*E);
322 ExternalSource = new MultiplexExternalSemaSource(*ExternalSource, *E);
323 isMultiplexExternalSource = true;
327 /// \brief Print out statistics about the semantic analysis.
328 void Sema::PrintStats() const {
329 llvm::errs() << "\n*** Semantic Analysis Stats:\n";
330 llvm::errs() << NumSFINAEErrors << " SFINAE diagnostics trapped.\n";
332 BumpAlloc.PrintStats();
333 AnalysisWarnings.PrintStats();
336 /// ImpCastExprToType - If Expr is not of type 'Type', insert an implicit cast.
337 /// If there is already an implicit cast, merge into the existing one.
338 /// The result is of the given category.
339 ExprResult Sema::ImpCastExprToType(Expr *E, QualType Ty,
340 CastKind Kind, ExprValueKind VK,
341 const CXXCastPath *BasePath,
342 CheckedConversionKind CCK) {
344 if (VK == VK_RValue && !E->isRValue()) {
347 llvm_unreachable("can't implicitly cast lvalue to rvalue with this cast "
349 case CK_LValueToRValue:
350 case CK_ArrayToPointerDecay:
351 case CK_FunctionToPointerDecay:
356 assert((VK == VK_RValue || !E->isRValue()) && "can't cast rvalue to lvalue");
359 // Check whether we're implicitly casting from a nullable type to a nonnull
361 if (auto exprNullability = E->getType()->getNullability(Context)) {
362 if (*exprNullability == NullabilityKind::Nullable) {
363 if (auto typeNullability = Ty->getNullability(Context)) {
364 if (*typeNullability == NullabilityKind::NonNull) {
365 Diag(E->getLocStart(), diag::warn_nullability_lost)
366 << E->getType() << Ty;
372 QualType ExprTy = Context.getCanonicalType(E->getType());
373 QualType TypeTy = Context.getCanonicalType(Ty);
375 if (ExprTy == TypeTy)
378 if (ImplicitCastExpr *ImpCast = dyn_cast<ImplicitCastExpr>(E)) {
379 if (ImpCast->getCastKind() == Kind && (!BasePath || BasePath->empty())) {
380 ImpCast->setType(Ty);
381 ImpCast->setValueKind(VK);
386 return ImplicitCastExpr::Create(Context, Ty, Kind, E, BasePath, VK);
389 /// ScalarTypeToBooleanCastKind - Returns the cast kind corresponding
390 /// to the conversion from scalar type ScalarTy to the Boolean type.
391 CastKind Sema::ScalarTypeToBooleanCastKind(QualType ScalarTy) {
392 switch (ScalarTy->getScalarTypeKind()) {
393 case Type::STK_Bool: return CK_NoOp;
394 case Type::STK_CPointer: return CK_PointerToBoolean;
395 case Type::STK_BlockPointer: return CK_PointerToBoolean;
396 case Type::STK_ObjCObjectPointer: return CK_PointerToBoolean;
397 case Type::STK_MemberPointer: return CK_MemberPointerToBoolean;
398 case Type::STK_Integral: return CK_IntegralToBoolean;
399 case Type::STK_Floating: return CK_FloatingToBoolean;
400 case Type::STK_IntegralComplex: return CK_IntegralComplexToBoolean;
401 case Type::STK_FloatingComplex: return CK_FloatingComplexToBoolean;
406 /// \brief Used to prune the decls of Sema's UnusedFileScopedDecls vector.
407 static bool ShouldRemoveFromUnused(Sema *SemaRef, const DeclaratorDecl *D) {
408 if (D->getMostRecentDecl()->isUsed())
411 if (D->isExternallyVisible())
414 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
415 // UnusedFileScopedDecls stores the first declaration.
416 // The declaration may have become definition so check again.
417 const FunctionDecl *DeclToCheck;
418 if (FD->hasBody(DeclToCheck))
419 return !SemaRef->ShouldWarnIfUnusedFileScopedDecl(DeclToCheck);
421 // Later redecls may add new information resulting in not having to warn,
423 DeclToCheck = FD->getMostRecentDecl();
424 if (DeclToCheck != FD)
425 return !SemaRef->ShouldWarnIfUnusedFileScopedDecl(DeclToCheck);
428 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) {
429 // If a variable usable in constant expressions is referenced,
430 // don't warn if it isn't used: if the value of a variable is required
431 // for the computation of a constant expression, it doesn't make sense to
432 // warn even if the variable isn't odr-used. (isReferenced doesn't
433 // precisely reflect that, but it's a decent approximation.)
434 if (VD->isReferenced() &&
435 VD->isUsableInConstantExpressions(SemaRef->Context))
438 // UnusedFileScopedDecls stores the first declaration.
439 // The declaration may have become definition so check again.
440 const VarDecl *DeclToCheck = VD->getDefinition();
442 return !SemaRef->ShouldWarnIfUnusedFileScopedDecl(DeclToCheck);
444 // Later redecls may add new information resulting in not having to warn,
446 DeclToCheck = VD->getMostRecentDecl();
447 if (DeclToCheck != VD)
448 return !SemaRef->ShouldWarnIfUnusedFileScopedDecl(DeclToCheck);
454 /// Obtains a sorted list of functions that are undefined but ODR-used.
455 void Sema::getUndefinedButUsed(
456 SmallVectorImpl<std::pair<NamedDecl *, SourceLocation> > &Undefined) {
457 for (llvm::DenseMap<NamedDecl *, SourceLocation>::iterator
458 I = UndefinedButUsed.begin(), E = UndefinedButUsed.end();
460 NamedDecl *ND = I->first;
462 // Ignore attributes that have become invalid.
463 if (ND->isInvalidDecl()) continue;
465 // __attribute__((weakref)) is basically a definition.
466 if (ND->hasAttr<WeakRefAttr>()) continue;
468 if (FunctionDecl *FD = dyn_cast<FunctionDecl>(ND)) {
471 if (FD->isExternallyVisible() &&
472 !FD->getMostRecentDecl()->isInlined())
475 if (cast<VarDecl>(ND)->hasDefinition() != VarDecl::DeclarationOnly)
477 if (ND->isExternallyVisible())
481 Undefined.push_back(std::make_pair(ND, I->second));
484 // Sort (in order of use site) so that we're not dependent on the iteration
485 // order through an llvm::DenseMap.
486 SourceManager &SM = Context.getSourceManager();
487 std::sort(Undefined.begin(), Undefined.end(),
488 [&SM](const std::pair<NamedDecl *, SourceLocation> &l,
489 const std::pair<NamedDecl *, SourceLocation> &r) {
490 if (l.second.isValid() && !r.second.isValid())
492 if (!l.second.isValid() && r.second.isValid())
494 if (l.second != r.second)
495 return SM.isBeforeInTranslationUnit(l.second, r.second);
496 return SM.isBeforeInTranslationUnit(l.first->getLocation(),
497 r.first->getLocation());
501 /// checkUndefinedButUsed - Check for undefined objects with internal linkage
502 /// or that are inline.
503 static void checkUndefinedButUsed(Sema &S) {
504 if (S.UndefinedButUsed.empty()) return;
506 // Collect all the still-undefined entities with internal linkage.
507 SmallVector<std::pair<NamedDecl *, SourceLocation>, 16> Undefined;
508 S.getUndefinedButUsed(Undefined);
509 if (Undefined.empty()) return;
511 for (SmallVectorImpl<std::pair<NamedDecl *, SourceLocation> >::iterator
512 I = Undefined.begin(), E = Undefined.end(); I != E; ++I) {
513 NamedDecl *ND = I->first;
515 if (ND->hasAttr<DLLImportAttr>() || ND->hasAttr<DLLExportAttr>()) {
516 // An exported function will always be emitted when defined, so even if
517 // the function is inline, it doesn't have to be emitted in this TU. An
518 // imported function implies that it has been exported somewhere else.
522 if (!ND->isExternallyVisible()) {
523 S.Diag(ND->getLocation(), diag::warn_undefined_internal)
524 << isa<VarDecl>(ND) << ND;
526 assert(cast<FunctionDecl>(ND)->getMostRecentDecl()->isInlined() &&
527 "used object requires definition but isn't inline or internal?");
528 S.Diag(ND->getLocation(), diag::warn_undefined_inline) << ND;
530 if (I->second.isValid())
531 S.Diag(I->second, diag::note_used_here);
535 void Sema::LoadExternalWeakUndeclaredIdentifiers() {
539 SmallVector<std::pair<IdentifierInfo *, WeakInfo>, 4> WeakIDs;
540 ExternalSource->ReadWeakUndeclaredIdentifiers(WeakIDs);
541 for (auto &WeakID : WeakIDs)
542 WeakUndeclaredIdentifiers.insert(WeakID);
546 typedef llvm::DenseMap<const CXXRecordDecl*, bool> RecordCompleteMap;
548 /// \brief Returns true, if all methods and nested classes of the given
549 /// CXXRecordDecl are defined in this translation unit.
551 /// Should only be called from ActOnEndOfTranslationUnit so that all
552 /// definitions are actually read.
553 static bool MethodsAndNestedClassesComplete(const CXXRecordDecl *RD,
554 RecordCompleteMap &MNCComplete) {
555 RecordCompleteMap::iterator Cache = MNCComplete.find(RD);
556 if (Cache != MNCComplete.end())
557 return Cache->second;
558 if (!RD->isCompleteDefinition())
560 bool Complete = true;
561 for (DeclContext::decl_iterator I = RD->decls_begin(),
563 I != E && Complete; ++I) {
564 if (const CXXMethodDecl *M = dyn_cast<CXXMethodDecl>(*I))
565 Complete = M->isDefined() || (M->isPure() && !isa<CXXDestructorDecl>(M));
566 else if (const FunctionTemplateDecl *F = dyn_cast<FunctionTemplateDecl>(*I))
567 // If the template function is marked as late template parsed at this
568 // point, it has not been instantiated and therefore we have not
569 // performed semantic analysis on it yet, so we cannot know if the type
570 // can be considered complete.
571 Complete = !F->getTemplatedDecl()->isLateTemplateParsed() &&
572 F->getTemplatedDecl()->isDefined();
573 else if (const CXXRecordDecl *R = dyn_cast<CXXRecordDecl>(*I)) {
574 if (R->isInjectedClassName())
576 if (R->hasDefinition())
577 Complete = MethodsAndNestedClassesComplete(R->getDefinition(),
583 MNCComplete[RD] = Complete;
587 /// \brief Returns true, if the given CXXRecordDecl is fully defined in this
588 /// translation unit, i.e. all methods are defined or pure virtual and all
589 /// friends, friend functions and nested classes are fully defined in this
590 /// translation unit.
592 /// Should only be called from ActOnEndOfTranslationUnit so that all
593 /// definitions are actually read.
594 static bool IsRecordFullyDefined(const CXXRecordDecl *RD,
595 RecordCompleteMap &RecordsComplete,
596 RecordCompleteMap &MNCComplete) {
597 RecordCompleteMap::iterator Cache = RecordsComplete.find(RD);
598 if (Cache != RecordsComplete.end())
599 return Cache->second;
600 bool Complete = MethodsAndNestedClassesComplete(RD, MNCComplete);
601 for (CXXRecordDecl::friend_iterator I = RD->friend_begin(),
602 E = RD->friend_end();
603 I != E && Complete; ++I) {
604 // Check if friend classes and methods are complete.
605 if (TypeSourceInfo *TSI = (*I)->getFriendType()) {
606 // Friend classes are available as the TypeSourceInfo of the FriendDecl.
607 if (CXXRecordDecl *FriendD = TSI->getType()->getAsCXXRecordDecl())
608 Complete = MethodsAndNestedClassesComplete(FriendD, MNCComplete);
612 // Friend functions are available through the NamedDecl of FriendDecl.
613 if (const FunctionDecl *FD =
614 dyn_cast<FunctionDecl>((*I)->getFriendDecl()))
615 Complete = FD->isDefined();
617 // This is a template friend, give up.
621 RecordsComplete[RD] = Complete;
625 void Sema::emitAndClearUnusedLocalTypedefWarnings() {
627 ExternalSource->ReadUnusedLocalTypedefNameCandidates(
628 UnusedLocalTypedefNameCandidates);
629 for (const TypedefNameDecl *TD : UnusedLocalTypedefNameCandidates) {
630 if (TD->isReferenced())
632 Diag(TD->getLocation(), diag::warn_unused_local_typedef)
633 << isa<TypeAliasDecl>(TD) << TD->getDeclName();
635 UnusedLocalTypedefNameCandidates.clear();
638 /// ActOnEndOfTranslationUnit - This is called at the very end of the
639 /// translation unit when EOF is reached and all but the top-level scope is
641 void Sema::ActOnEndOfTranslationUnit() {
642 assert(DelayedDiagnostics.getCurrentPool() == nullptr
643 && "reached end of translation unit with a pool attached?");
645 // If code completion is enabled, don't perform any end-of-translation-unit
647 if (PP.isCodeCompletionEnabled())
650 // Complete translation units and modules define vtables and perform implicit
651 // instantiations. PCH files do not.
652 if (TUKind != TU_Prefix) {
653 DiagnoseUseOfUnimplementedSelectors();
655 // If DefinedUsedVTables ends up marking any virtual member functions it
656 // might lead to more pending template instantiations, which we then need
660 // C++: Perform implicit template instantiations.
662 // FIXME: When we perform these implicit instantiations, we do not
663 // carefully keep track of the point of instantiation (C++ [temp.point]).
664 // This means that name lookup that occurs within the template
665 // instantiation will always happen at the end of the translation unit,
666 // so it will find some names that are not required to be found. This is
667 // valid, but we could do better by diagnosing if an instantiation uses a
668 // name that was not visible at its first point of instantiation.
669 if (ExternalSource) {
670 // Load pending instantiations from the external source.
671 SmallVector<PendingImplicitInstantiation, 4> Pending;
672 ExternalSource->ReadPendingInstantiations(Pending);
673 PendingInstantiations.insert(PendingInstantiations.begin(),
674 Pending.begin(), Pending.end());
676 PerformPendingInstantiations();
678 if (LateTemplateParserCleanup)
679 LateTemplateParserCleanup(OpaqueParser);
681 CheckDelayedMemberExceptionSpecs();
684 // All delayed member exception specs should be checked or we end up accepting
685 // incompatible declarations.
686 // FIXME: This is wrong for TUKind == TU_Prefix. In that case, we need to
687 // write out the lists to the AST file (if any).
688 assert(DelayedDefaultedMemberExceptionSpecs.empty());
689 assert(DelayedExceptionSpecChecks.empty());
691 // Remove file scoped decls that turned out to be used.
692 UnusedFileScopedDecls.erase(
693 std::remove_if(UnusedFileScopedDecls.begin(nullptr, true),
694 UnusedFileScopedDecls.end(),
695 std::bind1st(std::ptr_fun(ShouldRemoveFromUnused), this)),
696 UnusedFileScopedDecls.end());
698 if (TUKind == TU_Prefix) {
699 // Translation unit prefixes don't need any of the checking below.
704 // Check for #pragma weak identifiers that were never declared
705 LoadExternalWeakUndeclaredIdentifiers();
706 for (auto WeakID : WeakUndeclaredIdentifiers) {
707 if (WeakID.second.getUsed())
710 Diag(WeakID.second.getLocation(), diag::warn_weak_identifier_undeclared)
714 if (LangOpts.CPlusPlus11 &&
715 !Diags.isIgnored(diag::warn_delegating_ctor_cycle, SourceLocation()))
716 CheckDelegatingCtorCycles();
718 if (TUKind == TU_Module) {
719 // If we are building a module, resolve all of the exported declarations
721 if (Module *CurrentModule = PP.getCurrentModule()) {
722 ModuleMap &ModMap = PP.getHeaderSearchInfo().getModuleMap();
724 SmallVector<Module *, 2> Stack;
725 Stack.push_back(CurrentModule);
726 while (!Stack.empty()) {
727 Module *Mod = Stack.pop_back_val();
729 // Resolve the exported declarations and conflicts.
730 // FIXME: Actually complain, once we figure out how to teach the
731 // diagnostic client to deal with complaints in the module map at this
733 ModMap.resolveExports(Mod, /*Complain=*/false);
734 ModMap.resolveUses(Mod, /*Complain=*/false);
735 ModMap.resolveConflicts(Mod, /*Complain=*/false);
737 // Queue the submodules, so their exports will also be resolved.
738 Stack.append(Mod->submodule_begin(), Mod->submodule_end());
742 // Warnings emitted in ActOnEndOfTranslationUnit() should be emitted for
743 // modules when they are built, not every time they are used.
744 emitAndClearUnusedLocalTypedefWarnings();
746 // Modules don't need any of the checking below.
752 // A declaration of an identifier for an object that has file
753 // scope without an initializer, and without a storage-class
754 // specifier or with the storage-class specifier static,
755 // constitutes a tentative definition. If a translation unit
756 // contains one or more tentative definitions for an identifier,
757 // and the translation unit contains no external definition for
758 // that identifier, then the behavior is exactly as if the
759 // translation unit contains a file scope declaration of that
760 // identifier, with the composite type as of the end of the
761 // translation unit, with an initializer equal to 0.
762 llvm::SmallSet<VarDecl *, 32> Seen;
763 for (TentativeDefinitionsType::iterator
764 T = TentativeDefinitions.begin(ExternalSource),
765 TEnd = TentativeDefinitions.end();
768 VarDecl *VD = (*T)->getActingDefinition();
770 // If the tentative definition was completed, getActingDefinition() returns
771 // null. If we've already seen this variable before, insert()'s second
772 // return value is false.
773 if (!VD || VD->isInvalidDecl() || !Seen.insert(VD).second)
776 if (const IncompleteArrayType *ArrayT
777 = Context.getAsIncompleteArrayType(VD->getType())) {
778 // Set the length of the array to 1 (C99 6.9.2p5).
779 Diag(VD->getLocation(), diag::warn_tentative_incomplete_array);
780 llvm::APInt One(Context.getTypeSize(Context.getSizeType()), true);
781 QualType T = Context.getConstantArrayType(ArrayT->getElementType(),
782 One, ArrayType::Normal, 0);
784 } else if (RequireCompleteType(VD->getLocation(), VD->getType(),
785 diag::err_tentative_def_incomplete_type))
786 VD->setInvalidDecl();
788 CheckCompleteVariableDeclaration(VD);
790 // Notify the consumer that we've completed a tentative definition.
791 if (!VD->isInvalidDecl())
792 Consumer.CompleteTentativeDefinition(VD);
796 // If there were errors, disable 'unused' warnings since they will mostly be
798 if (!Diags.hasErrorOccurred()) {
799 // Output warning for unused file scoped decls.
800 for (UnusedFileScopedDeclsType::iterator
801 I = UnusedFileScopedDecls.begin(ExternalSource),
802 E = UnusedFileScopedDecls.end(); I != E; ++I) {
803 if (ShouldRemoveFromUnused(this, *I))
806 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(*I)) {
807 const FunctionDecl *DiagD;
808 if (!FD->hasBody(DiagD))
810 if (DiagD->isDeleted())
811 continue; // Deleted functions are supposed to be unused.
812 if (DiagD->isReferenced()) {
813 if (isa<CXXMethodDecl>(DiagD))
814 Diag(DiagD->getLocation(), diag::warn_unneeded_member_function)
815 << DiagD->getDeclName();
817 if (FD->getStorageClass() == SC_Static &&
818 !FD->isInlineSpecified() &&
819 !SourceMgr.isInMainFile(
820 SourceMgr.getExpansionLoc(FD->getLocation())))
821 Diag(DiagD->getLocation(),
822 diag::warn_unneeded_static_internal_decl)
823 << DiagD->getDeclName();
825 Diag(DiagD->getLocation(), diag::warn_unneeded_internal_decl)
826 << /*function*/0 << DiagD->getDeclName();
829 Diag(DiagD->getLocation(),
830 isa<CXXMethodDecl>(DiagD) ? diag::warn_unused_member_function
831 : diag::warn_unused_function)
832 << DiagD->getDeclName();
835 const VarDecl *DiagD = cast<VarDecl>(*I)->getDefinition();
837 DiagD = cast<VarDecl>(*I);
838 if (DiagD->isReferenced()) {
839 Diag(DiagD->getLocation(), diag::warn_unneeded_internal_decl)
840 << /*variable*/1 << DiagD->getDeclName();
841 } else if (DiagD->getType().isConstQualified()) {
842 Diag(DiagD->getLocation(), diag::warn_unused_const_variable)
843 << DiagD->getDeclName();
845 Diag(DiagD->getLocation(), diag::warn_unused_variable)
846 << DiagD->getDeclName();
852 ExternalSource->ReadUndefinedButUsed(UndefinedButUsed);
853 checkUndefinedButUsed(*this);
855 emitAndClearUnusedLocalTypedefWarnings();
858 if (!Diags.isIgnored(diag::warn_unused_private_field, SourceLocation())) {
859 RecordCompleteMap RecordsComplete;
860 RecordCompleteMap MNCComplete;
861 for (NamedDeclSetType::iterator I = UnusedPrivateFields.begin(),
862 E = UnusedPrivateFields.end(); I != E; ++I) {
863 const NamedDecl *D = *I;
864 const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(D->getDeclContext());
865 if (RD && !RD->isUnion() &&
866 IsRecordFullyDefined(RD, RecordsComplete, MNCComplete)) {
867 Diag(D->getLocation(), diag::warn_unused_private_field)
873 if (!Diags.isIgnored(diag::warn_mismatched_delete_new, SourceLocation())) {
875 ExternalSource->ReadMismatchingDeleteExpressions(DeleteExprs);
876 for (const auto &DeletedFieldInfo : DeleteExprs) {
877 for (const auto &DeleteExprLoc : DeletedFieldInfo.second) {
878 AnalyzeDeleteExprMismatch(DeletedFieldInfo.first, DeleteExprLoc.first,
879 DeleteExprLoc.second);
884 // Check we've noticed that we're no longer parsing the initializer for every
885 // variable. If we miss cases, then at best we have a performance issue and
886 // at worst a rejects-valid bug.
887 assert(ParsingInitForAutoVars.empty() &&
888 "Didn't unmark var as having its initializer parsed");
894 //===----------------------------------------------------------------------===//
896 //===----------------------------------------------------------------------===//
898 DeclContext *Sema::getFunctionLevelDeclContext() {
899 DeclContext *DC = CurContext;
902 if (isa<BlockDecl>(DC) || isa<EnumDecl>(DC) || isa<CapturedDecl>(DC)) {
903 DC = DC->getParent();
904 } else if (isa<CXXMethodDecl>(DC) &&
905 cast<CXXMethodDecl>(DC)->getOverloadedOperator() == OO_Call &&
906 cast<CXXRecordDecl>(DC->getParent())->isLambda()) {
907 DC = DC->getParent()->getParent();
915 /// getCurFunctionDecl - If inside of a function body, this returns a pointer
916 /// to the function decl for the function being parsed. If we're currently
917 /// in a 'block', this returns the containing context.
918 FunctionDecl *Sema::getCurFunctionDecl() {
919 DeclContext *DC = getFunctionLevelDeclContext();
920 return dyn_cast<FunctionDecl>(DC);
923 ObjCMethodDecl *Sema::getCurMethodDecl() {
924 DeclContext *DC = getFunctionLevelDeclContext();
925 while (isa<RecordDecl>(DC))
926 DC = DC->getParent();
927 return dyn_cast<ObjCMethodDecl>(DC);
930 NamedDecl *Sema::getCurFunctionOrMethodDecl() {
931 DeclContext *DC = getFunctionLevelDeclContext();
932 if (isa<ObjCMethodDecl>(DC) || isa<FunctionDecl>(DC))
933 return cast<NamedDecl>(DC);
937 void Sema::EmitCurrentDiagnostic(unsigned DiagID) {
938 // FIXME: It doesn't make sense to me that DiagID is an incoming argument here
939 // and yet we also use the current diag ID on the DiagnosticsEngine. This has
940 // been made more painfully obvious by the refactor that introduced this
941 // function, but it is possible that the incoming argument can be
942 // eliminnated. If it truly cannot be (for example, there is some reentrancy
943 // issue I am not seeing yet), then there should at least be a clarifying
944 // comment somewhere.
945 if (Optional<TemplateDeductionInfo*> Info = isSFINAEContext()) {
946 switch (DiagnosticIDs::getDiagnosticSFINAEResponse(
947 Diags.getCurrentDiagID())) {
948 case DiagnosticIDs::SFINAE_Report:
949 // We'll report the diagnostic below.
952 case DiagnosticIDs::SFINAE_SubstitutionFailure:
953 // Count this failure so that we know that template argument deduction
957 // Make a copy of this suppressed diagnostic and store it with the
958 // template-deduction information.
959 if (*Info && !(*Info)->hasSFINAEDiagnostic()) {
960 Diagnostic DiagInfo(&Diags);
961 (*Info)->addSFINAEDiagnostic(DiagInfo.getLocation(),
962 PartialDiagnostic(DiagInfo, Context.getDiagAllocator()));
965 Diags.setLastDiagnosticIgnored();
969 case DiagnosticIDs::SFINAE_AccessControl: {
970 // Per C++ Core Issue 1170, access control is part of SFINAE.
971 // Additionally, the AccessCheckingSFINAE flag can be used to temporarily
972 // make access control a part of SFINAE for the purposes of checking
974 if (!AccessCheckingSFINAE && !getLangOpts().CPlusPlus11)
977 SourceLocation Loc = Diags.getCurrentDiagLoc();
979 // Suppress this diagnostic.
982 // Make a copy of this suppressed diagnostic and store it with the
983 // template-deduction information.
984 if (*Info && !(*Info)->hasSFINAEDiagnostic()) {
985 Diagnostic DiagInfo(&Diags);
986 (*Info)->addSFINAEDiagnostic(DiagInfo.getLocation(),
987 PartialDiagnostic(DiagInfo, Context.getDiagAllocator()));
990 Diags.setLastDiagnosticIgnored();
993 // Now the diagnostic state is clear, produce a C++98 compatibility
995 Diag(Loc, diag::warn_cxx98_compat_sfinae_access_control);
997 // The last diagnostic which Sema produced was ignored. Suppress any
998 // notes attached to it.
999 Diags.setLastDiagnosticIgnored();
1003 case DiagnosticIDs::SFINAE_Suppress:
1004 // Make a copy of this suppressed diagnostic and store it with the
1005 // template-deduction information;
1007 Diagnostic DiagInfo(&Diags);
1008 (*Info)->addSuppressedDiagnostic(DiagInfo.getLocation(),
1009 PartialDiagnostic(DiagInfo, Context.getDiagAllocator()));
1012 // Suppress this diagnostic.
1013 Diags.setLastDiagnosticIgnored();
1019 // Set up the context's printing policy based on our current state.
1020 Context.setPrintingPolicy(getPrintingPolicy());
1022 // Emit the diagnostic.
1023 if (!Diags.EmitCurrentDiagnostic())
1026 // If this is not a note, and we're in a template instantiation
1027 // that is different from the last template instantiation where
1028 // we emitted an error, print a template instantiation
1030 if (!DiagnosticIDs::isBuiltinNote(DiagID) &&
1031 !ActiveTemplateInstantiations.empty() &&
1032 ActiveTemplateInstantiations.back()
1033 != LastTemplateInstantiationErrorContext) {
1034 PrintInstantiationStack();
1035 LastTemplateInstantiationErrorContext = ActiveTemplateInstantiations.back();
1039 Sema::SemaDiagnosticBuilder
1040 Sema::Diag(SourceLocation Loc, const PartialDiagnostic& PD) {
1041 SemaDiagnosticBuilder Builder(Diag(Loc, PD.getDiagID()));
1047 /// \brief Looks through the macro-expansion chain for the given
1048 /// location, looking for a macro expansion with the given name.
1049 /// If one is found, returns true and sets the location to that
1051 bool Sema::findMacroSpelling(SourceLocation &locref, StringRef name) {
1052 SourceLocation loc = locref;
1053 if (!loc.isMacroID()) return false;
1055 // There's no good way right now to look at the intermediate
1056 // expansions, so just jump to the expansion location.
1057 loc = getSourceManager().getExpansionLoc(loc);
1059 // If that's written with the name, stop here.
1060 SmallVector<char, 16> buffer;
1061 if (getPreprocessor().getSpelling(loc, buffer) == name) {
1068 /// \brief Determines the active Scope associated with the given declaration
1071 /// This routine maps a declaration context to the active Scope object that
1072 /// represents that declaration context in the parser. It is typically used
1073 /// from "scope-less" code (e.g., template instantiation, lazy creation of
1074 /// declarations) that injects a name for name-lookup purposes and, therefore,
1075 /// must update the Scope.
1077 /// \returns The scope corresponding to the given declaraion context, or NULL
1078 /// if no such scope is open.
1079 Scope *Sema::getScopeForContext(DeclContext *Ctx) {
1084 Ctx = Ctx->getPrimaryContext();
1085 for (Scope *S = getCurScope(); S; S = S->getParent()) {
1086 // Ignore scopes that cannot have declarations. This is important for
1087 // out-of-line definitions of static class members.
1088 if (S->getFlags() & (Scope::DeclScope | Scope::TemplateParamScope))
1089 if (DeclContext *Entity = S->getEntity())
1090 if (Ctx == Entity->getPrimaryContext())
1097 /// \brief Enter a new function scope
1098 void Sema::PushFunctionScope() {
1099 if (FunctionScopes.size() == 1) {
1100 // Use the "top" function scope rather than having to allocate
1101 // memory for a new scope.
1102 FunctionScopes.back()->Clear();
1103 FunctionScopes.push_back(FunctionScopes.back());
1107 FunctionScopes.push_back(new FunctionScopeInfo(getDiagnostics()));
1110 void Sema::PushBlockScope(Scope *BlockScope, BlockDecl *Block) {
1111 FunctionScopes.push_back(new BlockScopeInfo(getDiagnostics(),
1112 BlockScope, Block));
1115 LambdaScopeInfo *Sema::PushLambdaScope() {
1116 LambdaScopeInfo *const LSI = new LambdaScopeInfo(getDiagnostics());
1117 FunctionScopes.push_back(LSI);
1121 void Sema::RecordParsingTemplateParameterDepth(unsigned Depth) {
1122 if (LambdaScopeInfo *const LSI = getCurLambda()) {
1123 LSI->AutoTemplateParameterDepth = Depth;
1127 "Remove assertion if intentionally called in a non-lambda context.");
1130 void Sema::PopFunctionScopeInfo(const AnalysisBasedWarnings::Policy *WP,
1131 const Decl *D, const BlockExpr *blkExpr) {
1132 FunctionScopeInfo *Scope = FunctionScopes.pop_back_val();
1133 assert(!FunctionScopes.empty() && "mismatched push/pop!");
1135 // Issue any analysis-based warnings.
1137 AnalysisWarnings.IssueWarnings(*WP, Scope, D, blkExpr);
1139 for (const auto &PUD : Scope->PossiblyUnreachableDiags)
1140 Diag(PUD.Loc, PUD.PD);
1142 if (FunctionScopes.back() != Scope)
1146 void Sema::PushCompoundScope() {
1147 getCurFunction()->CompoundScopes.push_back(CompoundScopeInfo());
1150 void Sema::PopCompoundScope() {
1151 FunctionScopeInfo *CurFunction = getCurFunction();
1152 assert(!CurFunction->CompoundScopes.empty() && "mismatched push/pop");
1154 CurFunction->CompoundScopes.pop_back();
1157 /// \brief Determine whether any errors occurred within this function/method/
1159 bool Sema::hasAnyUnrecoverableErrorsInThisFunction() const {
1160 return getCurFunction()->ErrorTrap.hasUnrecoverableErrorOccurred();
1163 BlockScopeInfo *Sema::getCurBlock() {
1164 if (FunctionScopes.empty())
1167 auto CurBSI = dyn_cast<BlockScopeInfo>(FunctionScopes.back());
1168 if (CurBSI && CurBSI->TheDecl &&
1169 !CurBSI->TheDecl->Encloses(CurContext)) {
1170 // We have switched contexts due to template instantiation.
1171 assert(!ActiveTemplateInstantiations.empty());
1178 LambdaScopeInfo *Sema::getCurLambda() {
1179 if (FunctionScopes.empty())
1182 auto CurLSI = dyn_cast<LambdaScopeInfo>(FunctionScopes.back());
1183 if (CurLSI && CurLSI->Lambda &&
1184 !CurLSI->Lambda->Encloses(CurContext)) {
1185 // We have switched contexts due to template instantiation.
1186 assert(!ActiveTemplateInstantiations.empty());
1192 // We have a generic lambda if we parsed auto parameters, or we have
1193 // an associated template parameter list.
1194 LambdaScopeInfo *Sema::getCurGenericLambda() {
1195 if (LambdaScopeInfo *LSI = getCurLambda()) {
1196 return (LSI->AutoTemplateParams.size() ||
1197 LSI->GLTemplateParameterList) ? LSI : nullptr;
1203 void Sema::ActOnComment(SourceRange Comment) {
1204 if (!LangOpts.RetainCommentsFromSystemHeaders &&
1205 SourceMgr.isInSystemHeader(Comment.getBegin()))
1207 RawComment RC(SourceMgr, Comment, false,
1208 LangOpts.CommentOpts.ParseAllComments);
1209 if (RC.isAlmostTrailingComment()) {
1210 SourceRange MagicMarkerRange(Comment.getBegin(),
1211 Comment.getBegin().getLocWithOffset(3));
1212 StringRef MagicMarkerText;
1213 switch (RC.getKind()) {
1214 case RawComment::RCK_OrdinaryBCPL:
1215 MagicMarkerText = "///<";
1217 case RawComment::RCK_OrdinaryC:
1218 MagicMarkerText = "/**<";
1221 llvm_unreachable("if this is an almost Doxygen comment, "
1222 "it should be ordinary");
1224 Diag(Comment.getBegin(), diag::warn_not_a_doxygen_trailing_member_comment) <<
1225 FixItHint::CreateReplacement(MagicMarkerRange, MagicMarkerText);
1227 Context.addComment(RC);
1230 // Pin this vtable to this file.
1231 ExternalSemaSource::~ExternalSemaSource() {}
1233 void ExternalSemaSource::ReadMethodPool(Selector Sel) { }
1235 void ExternalSemaSource::ReadKnownNamespaces(
1236 SmallVectorImpl<NamespaceDecl *> &Namespaces) {
1239 void ExternalSemaSource::ReadUndefinedButUsed(
1240 llvm::DenseMap<NamedDecl *, SourceLocation> &Undefined) {
1243 void ExternalSemaSource::ReadMismatchingDeleteExpressions(llvm::MapVector<
1244 FieldDecl *, llvm::SmallVector<std::pair<SourceLocation, bool>, 4>> &) {}
1246 void PrettyDeclStackTraceEntry::print(raw_ostream &OS) const {
1247 SourceLocation Loc = this->Loc;
1248 if (!Loc.isValid() && TheDecl) Loc = TheDecl->getLocation();
1249 if (Loc.isValid()) {
1250 Loc.print(OS, S.getSourceManager());
1255 if (TheDecl && isa<NamedDecl>(TheDecl)) {
1256 std::string Name = cast<NamedDecl>(TheDecl)->getNameAsString();
1258 OS << " '" << Name << '\'';
1264 /// \brief Figure out if an expression could be turned into a call.
1266 /// Use this when trying to recover from an error where the programmer may have
1267 /// written just the name of a function instead of actually calling it.
1269 /// \param E - The expression to examine.
1270 /// \param ZeroArgCallReturnTy - If the expression can be turned into a call
1271 /// with no arguments, this parameter is set to the type returned by such a
1272 /// call; otherwise, it is set to an empty QualType.
1273 /// \param OverloadSet - If the expression is an overloaded function
1274 /// name, this parameter is populated with the decls of the various overloads.
1275 bool Sema::tryExprAsCall(Expr &E, QualType &ZeroArgCallReturnTy,
1276 UnresolvedSetImpl &OverloadSet) {
1277 ZeroArgCallReturnTy = QualType();
1278 OverloadSet.clear();
1280 const OverloadExpr *Overloads = nullptr;
1281 bool IsMemExpr = false;
1282 if (E.getType() == Context.OverloadTy) {
1283 OverloadExpr::FindResult FR = OverloadExpr::find(const_cast<Expr*>(&E));
1285 // Ignore overloads that are pointer-to-member constants.
1286 if (FR.HasFormOfMemberPointer)
1289 Overloads = FR.Expression;
1290 } else if (E.getType() == Context.BoundMemberTy) {
1291 Overloads = dyn_cast<UnresolvedMemberExpr>(E.IgnoreParens());
1295 bool Ambiguous = false;
1298 for (OverloadExpr::decls_iterator it = Overloads->decls_begin(),
1299 DeclsEnd = Overloads->decls_end(); it != DeclsEnd; ++it) {
1300 OverloadSet.addDecl(*it);
1302 // Check whether the function is a non-template, non-member which takes no
1306 if (const FunctionDecl *OverloadDecl
1307 = dyn_cast<FunctionDecl>((*it)->getUnderlyingDecl())) {
1308 if (OverloadDecl->getMinRequiredArguments() == 0) {
1309 if (!ZeroArgCallReturnTy.isNull() && !Ambiguous) {
1310 ZeroArgCallReturnTy = QualType();
1313 ZeroArgCallReturnTy = OverloadDecl->getReturnType();
1318 // If it's not a member, use better machinery to try to resolve the call
1320 return !ZeroArgCallReturnTy.isNull();
1323 // Attempt to call the member with no arguments - this will correctly handle
1324 // member templates with defaults/deduction of template arguments, overloads
1325 // with default arguments, etc.
1326 if (IsMemExpr && !E.isTypeDependent()) {
1327 bool Suppress = getDiagnostics().getSuppressAllDiagnostics();
1328 getDiagnostics().setSuppressAllDiagnostics(true);
1329 ExprResult R = BuildCallToMemberFunction(nullptr, &E, SourceLocation(),
1330 None, SourceLocation());
1331 getDiagnostics().setSuppressAllDiagnostics(Suppress);
1333 ZeroArgCallReturnTy = R.get()->getType();
1339 if (const DeclRefExpr *DeclRef = dyn_cast<DeclRefExpr>(E.IgnoreParens())) {
1340 if (const FunctionDecl *Fun = dyn_cast<FunctionDecl>(DeclRef->getDecl())) {
1341 if (Fun->getMinRequiredArguments() == 0)
1342 ZeroArgCallReturnTy = Fun->getReturnType();
1347 // We don't have an expression that's convenient to get a FunctionDecl from,
1348 // but we can at least check if the type is "function of 0 arguments".
1349 QualType ExprTy = E.getType();
1350 const FunctionType *FunTy = nullptr;
1351 QualType PointeeTy = ExprTy->getPointeeType();
1352 if (!PointeeTy.isNull())
1353 FunTy = PointeeTy->getAs<FunctionType>();
1355 FunTy = ExprTy->getAs<FunctionType>();
1357 if (const FunctionProtoType *FPT =
1358 dyn_cast_or_null<FunctionProtoType>(FunTy)) {
1359 if (FPT->getNumParams() == 0)
1360 ZeroArgCallReturnTy = FunTy->getReturnType();
1366 /// \brief Give notes for a set of overloads.
1368 /// A companion to tryExprAsCall. In cases when the name that the programmer
1369 /// wrote was an overloaded function, we may be able to make some guesses about
1370 /// plausible overloads based on their return types; such guesses can be handed
1371 /// off to this method to be emitted as notes.
1373 /// \param Overloads - The overloads to note.
1374 /// \param FinalNoteLoc - If we've suppressed printing some overloads due to
1375 /// -fshow-overloads=best, this is the location to attach to the note about too
1376 /// many candidates. Typically this will be the location of the original
1377 /// ill-formed expression.
1378 static void noteOverloads(Sema &S, const UnresolvedSetImpl &Overloads,
1379 const SourceLocation FinalNoteLoc) {
1380 int ShownOverloads = 0;
1381 int SuppressedOverloads = 0;
1382 for (UnresolvedSetImpl::iterator It = Overloads.begin(),
1383 DeclsEnd = Overloads.end(); It != DeclsEnd; ++It) {
1384 // FIXME: Magic number for max shown overloads stolen from
1385 // OverloadCandidateSet::NoteCandidates.
1386 if (ShownOverloads >= 4 && S.Diags.getShowOverloads() == Ovl_Best) {
1387 ++SuppressedOverloads;
1391 NamedDecl *Fn = (*It)->getUnderlyingDecl();
1392 S.Diag(Fn->getLocation(), diag::note_possible_target_of_call);
1396 if (SuppressedOverloads)
1397 S.Diag(FinalNoteLoc, diag::note_ovl_too_many_candidates)
1398 << SuppressedOverloads;
1401 static void notePlausibleOverloads(Sema &S, SourceLocation Loc,
1402 const UnresolvedSetImpl &Overloads,
1403 bool (*IsPlausibleResult)(QualType)) {
1404 if (!IsPlausibleResult)
1405 return noteOverloads(S, Overloads, Loc);
1407 UnresolvedSet<2> PlausibleOverloads;
1408 for (OverloadExpr::decls_iterator It = Overloads.begin(),
1409 DeclsEnd = Overloads.end(); It != DeclsEnd; ++It) {
1410 const FunctionDecl *OverloadDecl = cast<FunctionDecl>(*It);
1411 QualType OverloadResultTy = OverloadDecl->getReturnType();
1412 if (IsPlausibleResult(OverloadResultTy))
1413 PlausibleOverloads.addDecl(It.getDecl());
1415 noteOverloads(S, PlausibleOverloads, Loc);
1418 /// Determine whether the given expression can be called by just
1419 /// putting parentheses after it. Notably, expressions with unary
1420 /// operators can't be because the unary operator will start parsing
1421 /// outside the call.
1422 static bool IsCallableWithAppend(Expr *E) {
1423 E = E->IgnoreImplicit();
1424 return (!isa<CStyleCastExpr>(E) &&
1425 !isa<UnaryOperator>(E) &&
1426 !isa<BinaryOperator>(E) &&
1427 !isa<CXXOperatorCallExpr>(E));
1430 bool Sema::tryToRecoverWithCall(ExprResult &E, const PartialDiagnostic &PD,
1432 bool (*IsPlausibleResult)(QualType)) {
1433 SourceLocation Loc = E.get()->getExprLoc();
1434 SourceRange Range = E.get()->getSourceRange();
1436 QualType ZeroArgCallTy;
1437 UnresolvedSet<4> Overloads;
1438 if (tryExprAsCall(*E.get(), ZeroArgCallTy, Overloads) &&
1439 !ZeroArgCallTy.isNull() &&
1440 (!IsPlausibleResult || IsPlausibleResult(ZeroArgCallTy))) {
1441 // At this point, we know E is potentially callable with 0
1442 // arguments and that it returns something of a reasonable type,
1443 // so we can emit a fixit and carry on pretending that E was
1444 // actually a CallExpr.
1445 SourceLocation ParenInsertionLoc = PP.getLocForEndOfToken(Range.getEnd());
1447 << /*zero-arg*/ 1 << Range
1448 << (IsCallableWithAppend(E.get())
1449 ? FixItHint::CreateInsertion(ParenInsertionLoc, "()")
1451 notePlausibleOverloads(*this, Loc, Overloads, IsPlausibleResult);
1453 // FIXME: Try this before emitting the fixit, and suppress diagnostics
1455 E = ActOnCallExpr(nullptr, E.get(), Range.getEnd(), None,
1456 Range.getEnd().getLocWithOffset(1));
1460 if (!ForceComplain) return false;
1462 Diag(Loc, PD) << /*not zero-arg*/ 0 << Range;
1463 notePlausibleOverloads(*this, Loc, Overloads, IsPlausibleResult);
1468 IdentifierInfo *Sema::getSuperIdentifier() const {
1470 Ident_super = &Context.Idents.get("super");
1474 IdentifierInfo *Sema::getFloat128Identifier() const {
1475 if (!Ident___float128)
1476 Ident___float128 = &Context.Idents.get("__float128");
1477 return Ident___float128;
1480 void Sema::PushCapturedRegionScope(Scope *S, CapturedDecl *CD, RecordDecl *RD,
1481 CapturedRegionKind K) {
1482 CapturingScopeInfo *CSI = new CapturedRegionScopeInfo(
1483 getDiagnostics(), S, CD, RD, CD->getContextParam(), K);
1484 CSI->ReturnType = Context.VoidTy;
1485 FunctionScopes.push_back(CSI);
1488 CapturedRegionScopeInfo *Sema::getCurCapturedRegion() {
1489 if (FunctionScopes.empty())
1492 return dyn_cast<CapturedRegionScopeInfo>(FunctionScopes.back());
1495 const llvm::MapVector<FieldDecl *, Sema::DeleteLocs> &
1496 Sema::getMismatchingDeleteExpressions() const {