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), NSValueDecl(nullptr),
95 NSStringDecl(nullptr), StringWithUTF8StringMethod(nullptr),
96 ValueWithBytesObjCTypeMethod(nullptr),
97 NSArrayDecl(nullptr), ArrayWithObjectsMethod(nullptr),
98 NSDictionaryDecl(nullptr), DictionaryWithObjectsMethod(nullptr),
99 MSAsmLabelNameCounter(0),
100 GlobalNewDeleteDeclared(false),
103 CachedFakeTopLevelModule(nullptr),
104 AccessCheckingSFINAE(false), InNonInstantiationSFINAEContext(false),
105 NonInstantiationEntries(0), ArgumentPackSubstitutionIndex(-1),
106 CurrentInstantiationScope(nullptr), DisableTypoCorrection(false),
107 TyposCorrected(0), AnalysisWarnings(*this), ThreadSafetyDeclCache(nullptr),
108 VarDataSharingAttributesStack(nullptr), CurScope(nullptr),
109 Ident_super(nullptr), Ident___float128(nullptr)
113 LoadedExternalKnownNamespaces = false;
114 for (unsigned I = 0; I != NSAPI::NumNSNumberLiteralMethods; ++I)
115 NSNumberLiteralMethods[I] = nullptr;
117 if (getLangOpts().ObjC1)
118 NSAPIObj.reset(new NSAPI(Context));
120 if (getLangOpts().CPlusPlus)
121 FieldCollector.reset(new CXXFieldCollector());
123 // Tell diagnostics how to render things from the AST library.
124 PP.getDiagnostics().SetArgToStringFn(&FormatASTNodeDiagnosticArgument,
127 ExprEvalContexts.emplace_back(PotentiallyEvaluated, 0, false, nullptr, false);
129 FunctionScopes.push_back(new FunctionScopeInfo(Diags));
131 // Initilization of data sharing attributes stack for OpenMP
132 InitDataSharingAttributesStack();
135 void Sema::addImplicitTypedef(StringRef Name, QualType T) {
136 DeclarationName DN = &Context.Idents.get(Name);
137 if (IdResolver.begin(DN) == IdResolver.end())
138 PushOnScopeChains(Context.buildImplicitTypedef(T, Name), TUScope);
141 void Sema::Initialize() {
142 // Tell the AST consumer about this Sema object.
143 Consumer.Initialize(Context);
145 // FIXME: Isn't this redundant with the initialization above?
146 if (SemaConsumer *SC = dyn_cast<SemaConsumer>(&Consumer))
147 SC->InitializeSema(*this);
149 // Tell the external Sema source about this Sema object.
150 if (ExternalSemaSource *ExternalSema
151 = dyn_cast_or_null<ExternalSemaSource>(Context.getExternalSource()))
152 ExternalSema->InitializeSema(*this);
154 // This needs to happen after ExternalSemaSource::InitializeSema(this) or we
155 // will not be able to merge any duplicate __va_list_tag decls correctly.
156 VAListTagName = PP.getIdentifierInfo("__va_list_tag");
158 // Initialize predefined 128-bit integer types, if needed.
159 if (Context.getTargetInfo().hasInt128Type()) {
160 // If either of the 128-bit integer types are unavailable to name lookup,
162 DeclarationName Int128 = &Context.Idents.get("__int128_t");
163 if (IdResolver.begin(Int128) == IdResolver.end())
164 PushOnScopeChains(Context.getInt128Decl(), TUScope);
166 DeclarationName UInt128 = &Context.Idents.get("__uint128_t");
167 if (IdResolver.begin(UInt128) == IdResolver.end())
168 PushOnScopeChains(Context.getUInt128Decl(), TUScope);
172 // Initialize predefined Objective-C types:
173 if (PP.getLangOpts().ObjC1) {
174 // If 'SEL' does not yet refer to any declarations, make it refer to the
176 DeclarationName SEL = &Context.Idents.get("SEL");
177 if (IdResolver.begin(SEL) == IdResolver.end())
178 PushOnScopeChains(Context.getObjCSelDecl(), TUScope);
180 // If 'id' does not yet refer to any declarations, make it refer to the
182 DeclarationName Id = &Context.Idents.get("id");
183 if (IdResolver.begin(Id) == IdResolver.end())
184 PushOnScopeChains(Context.getObjCIdDecl(), TUScope);
186 // Create the built-in typedef for 'Class'.
187 DeclarationName Class = &Context.Idents.get("Class");
188 if (IdResolver.begin(Class) == IdResolver.end())
189 PushOnScopeChains(Context.getObjCClassDecl(), TUScope);
191 // Create the built-in forward declaratino for 'Protocol'.
192 DeclarationName Protocol = &Context.Idents.get("Protocol");
193 if (IdResolver.begin(Protocol) == IdResolver.end())
194 PushOnScopeChains(Context.getObjCProtocolDecl(), TUScope);
197 // Initialize Microsoft "predefined C++ types".
198 if (PP.getLangOpts().MSVCCompat) {
199 if (PP.getLangOpts().CPlusPlus &&
200 IdResolver.begin(&Context.Idents.get("type_info")) == IdResolver.end())
201 PushOnScopeChains(Context.buildImplicitRecord("type_info", TTK_Class),
204 addImplicitTypedef("size_t", Context.getSizeType());
207 // Initialize predefined OpenCL types.
208 if (PP.getLangOpts().OpenCL) {
209 addImplicitTypedef("image1d_t", Context.OCLImage1dTy);
210 addImplicitTypedef("image1d_array_t", Context.OCLImage1dArrayTy);
211 addImplicitTypedef("image1d_buffer_t", Context.OCLImage1dBufferTy);
212 addImplicitTypedef("image2d_t", Context.OCLImage2dTy);
213 addImplicitTypedef("image2d_array_t", Context.OCLImage2dArrayTy);
214 addImplicitTypedef("image3d_t", Context.OCLImage3dTy);
215 addImplicitTypedef("sampler_t", Context.OCLSamplerTy);
216 addImplicitTypedef("event_t", Context.OCLEventTy);
217 if (getLangOpts().OpenCLVersion >= 200) {
218 addImplicitTypedef("atomic_int", Context.getAtomicType(Context.IntTy));
219 addImplicitTypedef("atomic_uint",
220 Context.getAtomicType(Context.UnsignedIntTy));
221 addImplicitTypedef("atomic_long", Context.getAtomicType(Context.LongTy));
222 addImplicitTypedef("atomic_ulong",
223 Context.getAtomicType(Context.UnsignedLongTy));
224 addImplicitTypedef("atomic_float",
225 Context.getAtomicType(Context.FloatTy));
226 addImplicitTypedef("atomic_double",
227 Context.getAtomicType(Context.DoubleTy));
228 // OpenCLC v2.0, s6.13.11.6 requires that atomic_flag is implemented as
229 // 32-bit integer and OpenCLC v2.0, s6.1.1 int is always 32-bit wide.
230 addImplicitTypedef("atomic_flag", Context.getAtomicType(Context.IntTy));
231 addImplicitTypedef("atomic_intptr_t",
232 Context.getAtomicType(Context.getIntPtrType()));
233 addImplicitTypedef("atomic_uintptr_t",
234 Context.getAtomicType(Context.getUIntPtrType()));
235 addImplicitTypedef("atomic_size_t",
236 Context.getAtomicType(Context.getSizeType()));
237 addImplicitTypedef("atomic_ptrdiff_t",
238 Context.getAtomicType(Context.getPointerDiffType()));
242 DeclarationName BuiltinVaList = &Context.Idents.get("__builtin_va_list");
243 if (IdResolver.begin(BuiltinVaList) == IdResolver.end())
244 PushOnScopeChains(Context.getBuiltinVaListDecl(), TUScope);
248 llvm::DeleteContainerSeconds(LateParsedTemplateMap);
249 if (PackContext) FreePackedContext();
250 if (VisContext) FreeVisContext();
251 // Kill all the active scopes.
252 for (unsigned I = 1, E = FunctionScopes.size(); I != E; ++I)
253 delete FunctionScopes[I];
254 if (FunctionScopes.size() == 1)
255 delete FunctionScopes[0];
257 // Tell the SemaConsumer to forget about us; we're going out of scope.
258 if (SemaConsumer *SC = dyn_cast<SemaConsumer>(&Consumer))
261 // Detach from the external Sema source.
262 if (ExternalSemaSource *ExternalSema
263 = dyn_cast_or_null<ExternalSemaSource>(Context.getExternalSource()))
264 ExternalSema->ForgetSema();
266 // If Sema's ExternalSource is the multiplexer - we own it.
267 if (isMultiplexExternalSource)
268 delete ExternalSource;
270 threadSafety::threadSafetyCleanup(ThreadSafetyDeclCache);
272 // Destroys data sharing attributes stack for OpenMP
273 DestroyDataSharingAttributesStack();
275 assert(DelayedTypos.empty() && "Uncorrected typos!");
278 /// makeUnavailableInSystemHeader - There is an error in the current
279 /// context. If we're still in a system header, and we can plausibly
280 /// make the relevant declaration unavailable instead of erroring, do
281 /// so and return true.
282 bool Sema::makeUnavailableInSystemHeader(SourceLocation loc,
284 // If we're not in a function, it's an error.
285 FunctionDecl *fn = dyn_cast<FunctionDecl>(CurContext);
286 if (!fn) return false;
288 // If we're in template instantiation, it's an error.
289 if (!ActiveTemplateInstantiations.empty())
292 // If that function's not in a system header, it's an error.
293 if (!Context.getSourceManager().isInSystemHeader(loc))
296 // If the function is already unavailable, it's not an error.
297 if (fn->hasAttr<UnavailableAttr>()) return true;
299 fn->addAttr(UnavailableAttr::CreateImplicit(Context, msg, loc));
303 ASTMutationListener *Sema::getASTMutationListener() const {
304 return getASTConsumer().GetASTMutationListener();
307 ///\brief Registers an external source. If an external source already exists,
308 /// creates a multiplex external source and appends to it.
310 ///\param[in] E - A non-null external sema source.
312 void Sema::addExternalSource(ExternalSemaSource *E) {
313 assert(E && "Cannot use with NULL ptr");
315 if (!ExternalSource) {
320 if (isMultiplexExternalSource)
321 static_cast<MultiplexExternalSemaSource*>(ExternalSource)->addSource(*E);
323 ExternalSource = new MultiplexExternalSemaSource(*ExternalSource, *E);
324 isMultiplexExternalSource = true;
328 /// \brief Print out statistics about the semantic analysis.
329 void Sema::PrintStats() const {
330 llvm::errs() << "\n*** Semantic Analysis Stats:\n";
331 llvm::errs() << NumSFINAEErrors << " SFINAE diagnostics trapped.\n";
333 BumpAlloc.PrintStats();
334 AnalysisWarnings.PrintStats();
337 /// ImpCastExprToType - If Expr is not of type 'Type', insert an implicit cast.
338 /// If there is already an implicit cast, merge into the existing one.
339 /// The result is of the given category.
340 ExprResult Sema::ImpCastExprToType(Expr *E, QualType Ty,
341 CastKind Kind, ExprValueKind VK,
342 const CXXCastPath *BasePath,
343 CheckedConversionKind CCK) {
345 if (VK == VK_RValue && !E->isRValue()) {
348 llvm_unreachable("can't implicitly cast lvalue to rvalue with this cast "
350 case CK_LValueToRValue:
351 case CK_ArrayToPointerDecay:
352 case CK_FunctionToPointerDecay:
357 assert((VK == VK_RValue || !E->isRValue()) && "can't cast rvalue to lvalue");
360 // Check whether we're implicitly casting from a nullable type to a nonnull
362 if (auto exprNullability = E->getType()->getNullability(Context)) {
363 if (*exprNullability == NullabilityKind::Nullable) {
364 if (auto typeNullability = Ty->getNullability(Context)) {
365 if (*typeNullability == NullabilityKind::NonNull) {
366 Diag(E->getLocStart(), diag::warn_nullability_lost)
367 << E->getType() << Ty;
373 QualType ExprTy = Context.getCanonicalType(E->getType());
374 QualType TypeTy = Context.getCanonicalType(Ty);
376 if (ExprTy == TypeTy)
379 if (ImplicitCastExpr *ImpCast = dyn_cast<ImplicitCastExpr>(E)) {
380 if (ImpCast->getCastKind() == Kind && (!BasePath || BasePath->empty())) {
381 ImpCast->setType(Ty);
382 ImpCast->setValueKind(VK);
387 return ImplicitCastExpr::Create(Context, Ty, Kind, E, BasePath, VK);
390 /// ScalarTypeToBooleanCastKind - Returns the cast kind corresponding
391 /// to the conversion from scalar type ScalarTy to the Boolean type.
392 CastKind Sema::ScalarTypeToBooleanCastKind(QualType ScalarTy) {
393 switch (ScalarTy->getScalarTypeKind()) {
394 case Type::STK_Bool: return CK_NoOp;
395 case Type::STK_CPointer: return CK_PointerToBoolean;
396 case Type::STK_BlockPointer: return CK_PointerToBoolean;
397 case Type::STK_ObjCObjectPointer: return CK_PointerToBoolean;
398 case Type::STK_MemberPointer: return CK_MemberPointerToBoolean;
399 case Type::STK_Integral: return CK_IntegralToBoolean;
400 case Type::STK_Floating: return CK_FloatingToBoolean;
401 case Type::STK_IntegralComplex: return CK_IntegralComplexToBoolean;
402 case Type::STK_FloatingComplex: return CK_FloatingComplexToBoolean;
407 /// \brief Used to prune the decls of Sema's UnusedFileScopedDecls vector.
408 static bool ShouldRemoveFromUnused(Sema *SemaRef, const DeclaratorDecl *D) {
409 if (D->getMostRecentDecl()->isUsed())
412 if (D->isExternallyVisible())
415 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
416 // UnusedFileScopedDecls stores the first declaration.
417 // The declaration may have become definition so check again.
418 const FunctionDecl *DeclToCheck;
419 if (FD->hasBody(DeclToCheck))
420 return !SemaRef->ShouldWarnIfUnusedFileScopedDecl(DeclToCheck);
422 // Later redecls may add new information resulting in not having to warn,
424 DeclToCheck = FD->getMostRecentDecl();
425 if (DeclToCheck != FD)
426 return !SemaRef->ShouldWarnIfUnusedFileScopedDecl(DeclToCheck);
429 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) {
430 // If a variable usable in constant expressions is referenced,
431 // don't warn if it isn't used: if the value of a variable is required
432 // for the computation of a constant expression, it doesn't make sense to
433 // warn even if the variable isn't odr-used. (isReferenced doesn't
434 // precisely reflect that, but it's a decent approximation.)
435 if (VD->isReferenced() &&
436 VD->isUsableInConstantExpressions(SemaRef->Context))
439 // UnusedFileScopedDecls stores the first declaration.
440 // The declaration may have become definition so check again.
441 const VarDecl *DeclToCheck = VD->getDefinition();
443 return !SemaRef->ShouldWarnIfUnusedFileScopedDecl(DeclToCheck);
445 // Later redecls may add new information resulting in not having to warn,
447 DeclToCheck = VD->getMostRecentDecl();
448 if (DeclToCheck != VD)
449 return !SemaRef->ShouldWarnIfUnusedFileScopedDecl(DeclToCheck);
455 /// Obtains a sorted list of functions that are undefined but ODR-used.
456 void Sema::getUndefinedButUsed(
457 SmallVectorImpl<std::pair<NamedDecl *, SourceLocation> > &Undefined) {
458 for (llvm::DenseMap<NamedDecl *, SourceLocation>::iterator
459 I = UndefinedButUsed.begin(), E = UndefinedButUsed.end();
461 NamedDecl *ND = I->first;
463 // Ignore attributes that have become invalid.
464 if (ND->isInvalidDecl()) continue;
466 // __attribute__((weakref)) is basically a definition.
467 if (ND->hasAttr<WeakRefAttr>()) continue;
469 if (FunctionDecl *FD = dyn_cast<FunctionDecl>(ND)) {
472 if (FD->isExternallyVisible() &&
473 !FD->getMostRecentDecl()->isInlined())
476 if (cast<VarDecl>(ND)->hasDefinition() != VarDecl::DeclarationOnly)
478 if (ND->isExternallyVisible())
482 Undefined.push_back(std::make_pair(ND, I->second));
485 // Sort (in order of use site) so that we're not dependent on the iteration
486 // order through an llvm::DenseMap.
487 SourceManager &SM = Context.getSourceManager();
488 std::sort(Undefined.begin(), Undefined.end(),
489 [&SM](const std::pair<NamedDecl *, SourceLocation> &l,
490 const std::pair<NamedDecl *, SourceLocation> &r) {
491 if (l.second.isValid() && !r.second.isValid())
493 if (!l.second.isValid() && r.second.isValid())
495 if (l.second != r.second)
496 return SM.isBeforeInTranslationUnit(l.second, r.second);
497 return SM.isBeforeInTranslationUnit(l.first->getLocation(),
498 r.first->getLocation());
502 /// checkUndefinedButUsed - Check for undefined objects with internal linkage
503 /// or that are inline.
504 static void checkUndefinedButUsed(Sema &S) {
505 if (S.UndefinedButUsed.empty()) return;
507 // Collect all the still-undefined entities with internal linkage.
508 SmallVector<std::pair<NamedDecl *, SourceLocation>, 16> Undefined;
509 S.getUndefinedButUsed(Undefined);
510 if (Undefined.empty()) return;
512 for (SmallVectorImpl<std::pair<NamedDecl *, SourceLocation> >::iterator
513 I = Undefined.begin(), E = Undefined.end(); I != E; ++I) {
514 NamedDecl *ND = I->first;
516 if (ND->hasAttr<DLLImportAttr>() || ND->hasAttr<DLLExportAttr>()) {
517 // An exported function will always be emitted when defined, so even if
518 // the function is inline, it doesn't have to be emitted in this TU. An
519 // imported function implies that it has been exported somewhere else.
523 if (!ND->isExternallyVisible()) {
524 S.Diag(ND->getLocation(), diag::warn_undefined_internal)
525 << isa<VarDecl>(ND) << ND;
527 assert(cast<FunctionDecl>(ND)->getMostRecentDecl()->isInlined() &&
528 "used object requires definition but isn't inline or internal?");
529 S.Diag(ND->getLocation(), diag::warn_undefined_inline) << ND;
531 if (I->second.isValid())
532 S.Diag(I->second, diag::note_used_here);
536 void Sema::LoadExternalWeakUndeclaredIdentifiers() {
540 SmallVector<std::pair<IdentifierInfo *, WeakInfo>, 4> WeakIDs;
541 ExternalSource->ReadWeakUndeclaredIdentifiers(WeakIDs);
542 for (auto &WeakID : WeakIDs)
543 WeakUndeclaredIdentifiers.insert(WeakID);
547 typedef llvm::DenseMap<const CXXRecordDecl*, bool> RecordCompleteMap;
549 /// \brief Returns true, if all methods and nested classes of the given
550 /// CXXRecordDecl are defined in this translation unit.
552 /// Should only be called from ActOnEndOfTranslationUnit so that all
553 /// definitions are actually read.
554 static bool MethodsAndNestedClassesComplete(const CXXRecordDecl *RD,
555 RecordCompleteMap &MNCComplete) {
556 RecordCompleteMap::iterator Cache = MNCComplete.find(RD);
557 if (Cache != MNCComplete.end())
558 return Cache->second;
559 if (!RD->isCompleteDefinition())
561 bool Complete = true;
562 for (DeclContext::decl_iterator I = RD->decls_begin(),
564 I != E && Complete; ++I) {
565 if (const CXXMethodDecl *M = dyn_cast<CXXMethodDecl>(*I))
566 Complete = M->isDefined() || (M->isPure() && !isa<CXXDestructorDecl>(M));
567 else if (const FunctionTemplateDecl *F = dyn_cast<FunctionTemplateDecl>(*I))
568 // If the template function is marked as late template parsed at this
569 // point, it has not been instantiated and therefore we have not
570 // performed semantic analysis on it yet, so we cannot know if the type
571 // can be considered complete.
572 Complete = !F->getTemplatedDecl()->isLateTemplateParsed() &&
573 F->getTemplatedDecl()->isDefined();
574 else if (const CXXRecordDecl *R = dyn_cast<CXXRecordDecl>(*I)) {
575 if (R->isInjectedClassName())
577 if (R->hasDefinition())
578 Complete = MethodsAndNestedClassesComplete(R->getDefinition(),
584 MNCComplete[RD] = Complete;
588 /// \brief Returns true, if the given CXXRecordDecl is fully defined in this
589 /// translation unit, i.e. all methods are defined or pure virtual and all
590 /// friends, friend functions and nested classes are fully defined in this
591 /// translation unit.
593 /// Should only be called from ActOnEndOfTranslationUnit so that all
594 /// definitions are actually read.
595 static bool IsRecordFullyDefined(const CXXRecordDecl *RD,
596 RecordCompleteMap &RecordsComplete,
597 RecordCompleteMap &MNCComplete) {
598 RecordCompleteMap::iterator Cache = RecordsComplete.find(RD);
599 if (Cache != RecordsComplete.end())
600 return Cache->second;
601 bool Complete = MethodsAndNestedClassesComplete(RD, MNCComplete);
602 for (CXXRecordDecl::friend_iterator I = RD->friend_begin(),
603 E = RD->friend_end();
604 I != E && Complete; ++I) {
605 // Check if friend classes and methods are complete.
606 if (TypeSourceInfo *TSI = (*I)->getFriendType()) {
607 // Friend classes are available as the TypeSourceInfo of the FriendDecl.
608 if (CXXRecordDecl *FriendD = TSI->getType()->getAsCXXRecordDecl())
609 Complete = MethodsAndNestedClassesComplete(FriendD, MNCComplete);
613 // Friend functions are available through the NamedDecl of FriendDecl.
614 if (const FunctionDecl *FD =
615 dyn_cast<FunctionDecl>((*I)->getFriendDecl()))
616 Complete = FD->isDefined();
618 // This is a template friend, give up.
622 RecordsComplete[RD] = Complete;
626 void Sema::emitAndClearUnusedLocalTypedefWarnings() {
628 ExternalSource->ReadUnusedLocalTypedefNameCandidates(
629 UnusedLocalTypedefNameCandidates);
630 for (const TypedefNameDecl *TD : UnusedLocalTypedefNameCandidates) {
631 if (TD->isReferenced())
633 Diag(TD->getLocation(), diag::warn_unused_local_typedef)
634 << isa<TypeAliasDecl>(TD) << TD->getDeclName();
636 UnusedLocalTypedefNameCandidates.clear();
639 /// ActOnEndOfTranslationUnit - This is called at the very end of the
640 /// translation unit when EOF is reached and all but the top-level scope is
642 void Sema::ActOnEndOfTranslationUnit() {
643 assert(DelayedDiagnostics.getCurrentPool() == nullptr
644 && "reached end of translation unit with a pool attached?");
646 // If code completion is enabled, don't perform any end-of-translation-unit
648 if (PP.isCodeCompletionEnabled())
651 // Complete translation units and modules define vtables and perform implicit
652 // instantiations. PCH files do not.
653 if (TUKind != TU_Prefix) {
654 DiagnoseUseOfUnimplementedSelectors();
656 // If DefinedUsedVTables ends up marking any virtual member functions it
657 // might lead to more pending template instantiations, which we then need
661 // C++: Perform implicit template instantiations.
663 // FIXME: When we perform these implicit instantiations, we do not
664 // carefully keep track of the point of instantiation (C++ [temp.point]).
665 // This means that name lookup that occurs within the template
666 // instantiation will always happen at the end of the translation unit,
667 // so it will find some names that are not required to be found. This is
668 // valid, but we could do better by diagnosing if an instantiation uses a
669 // name that was not visible at its first point of instantiation.
670 if (ExternalSource) {
671 // Load pending instantiations from the external source.
672 SmallVector<PendingImplicitInstantiation, 4> Pending;
673 ExternalSource->ReadPendingInstantiations(Pending);
674 PendingInstantiations.insert(PendingInstantiations.begin(),
675 Pending.begin(), Pending.end());
677 PerformPendingInstantiations();
679 if (LateTemplateParserCleanup)
680 LateTemplateParserCleanup(OpaqueParser);
682 CheckDelayedMemberExceptionSpecs();
685 // All delayed member exception specs should be checked or we end up accepting
686 // incompatible declarations.
687 // FIXME: This is wrong for TUKind == TU_Prefix. In that case, we need to
688 // write out the lists to the AST file (if any).
689 assert(DelayedDefaultedMemberExceptionSpecs.empty());
690 assert(DelayedExceptionSpecChecks.empty());
692 // Remove file scoped decls that turned out to be used.
693 UnusedFileScopedDecls.erase(
694 std::remove_if(UnusedFileScopedDecls.begin(nullptr, true),
695 UnusedFileScopedDecls.end(),
696 std::bind1st(std::ptr_fun(ShouldRemoveFromUnused), this)),
697 UnusedFileScopedDecls.end());
699 if (TUKind == TU_Prefix) {
700 // Translation unit prefixes don't need any of the checking below.
705 // Check for #pragma weak identifiers that were never declared
706 LoadExternalWeakUndeclaredIdentifiers();
707 for (auto WeakID : WeakUndeclaredIdentifiers) {
708 if (WeakID.second.getUsed())
711 Diag(WeakID.second.getLocation(), diag::warn_weak_identifier_undeclared)
715 if (LangOpts.CPlusPlus11 &&
716 !Diags.isIgnored(diag::warn_delegating_ctor_cycle, SourceLocation()))
717 CheckDelegatingCtorCycles();
719 if (TUKind == TU_Module) {
720 // If we are building a module, resolve all of the exported declarations
722 if (Module *CurrentModule = PP.getCurrentModule()) {
723 ModuleMap &ModMap = PP.getHeaderSearchInfo().getModuleMap();
725 SmallVector<Module *, 2> Stack;
726 Stack.push_back(CurrentModule);
727 while (!Stack.empty()) {
728 Module *Mod = Stack.pop_back_val();
730 // Resolve the exported declarations and conflicts.
731 // FIXME: Actually complain, once we figure out how to teach the
732 // diagnostic client to deal with complaints in the module map at this
734 ModMap.resolveExports(Mod, /*Complain=*/false);
735 ModMap.resolveUses(Mod, /*Complain=*/false);
736 ModMap.resolveConflicts(Mod, /*Complain=*/false);
738 // Queue the submodules, so their exports will also be resolved.
739 Stack.append(Mod->submodule_begin(), Mod->submodule_end());
743 // Warnings emitted in ActOnEndOfTranslationUnit() should be emitted for
744 // modules when they are built, not every time they are used.
745 emitAndClearUnusedLocalTypedefWarnings();
747 // Modules don't need any of the checking below.
753 // A declaration of an identifier for an object that has file
754 // scope without an initializer, and without a storage-class
755 // specifier or with the storage-class specifier static,
756 // constitutes a tentative definition. If a translation unit
757 // contains one or more tentative definitions for an identifier,
758 // and the translation unit contains no external definition for
759 // that identifier, then the behavior is exactly as if the
760 // translation unit contains a file scope declaration of that
761 // identifier, with the composite type as of the end of the
762 // translation unit, with an initializer equal to 0.
763 llvm::SmallSet<VarDecl *, 32> Seen;
764 for (TentativeDefinitionsType::iterator
765 T = TentativeDefinitions.begin(ExternalSource),
766 TEnd = TentativeDefinitions.end();
769 VarDecl *VD = (*T)->getActingDefinition();
771 // If the tentative definition was completed, getActingDefinition() returns
772 // null. If we've already seen this variable before, insert()'s second
773 // return value is false.
774 if (!VD || VD->isInvalidDecl() || !Seen.insert(VD).second)
777 if (const IncompleteArrayType *ArrayT
778 = Context.getAsIncompleteArrayType(VD->getType())) {
779 // Set the length of the array to 1 (C99 6.9.2p5).
780 Diag(VD->getLocation(), diag::warn_tentative_incomplete_array);
781 llvm::APInt One(Context.getTypeSize(Context.getSizeType()), true);
782 QualType T = Context.getConstantArrayType(ArrayT->getElementType(),
783 One, ArrayType::Normal, 0);
785 } else if (RequireCompleteType(VD->getLocation(), VD->getType(),
786 diag::err_tentative_def_incomplete_type))
787 VD->setInvalidDecl();
789 CheckCompleteVariableDeclaration(VD);
791 // Notify the consumer that we've completed a tentative definition.
792 if (!VD->isInvalidDecl())
793 Consumer.CompleteTentativeDefinition(VD);
797 // If there were errors, disable 'unused' warnings since they will mostly be
799 if (!Diags.hasErrorOccurred()) {
800 // Output warning for unused file scoped decls.
801 for (UnusedFileScopedDeclsType::iterator
802 I = UnusedFileScopedDecls.begin(ExternalSource),
803 E = UnusedFileScopedDecls.end(); I != E; ++I) {
804 if (ShouldRemoveFromUnused(this, *I))
807 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(*I)) {
808 const FunctionDecl *DiagD;
809 if (!FD->hasBody(DiagD))
811 if (DiagD->isDeleted())
812 continue; // Deleted functions are supposed to be unused.
813 if (DiagD->isReferenced()) {
814 if (isa<CXXMethodDecl>(DiagD))
815 Diag(DiagD->getLocation(), diag::warn_unneeded_member_function)
816 << DiagD->getDeclName();
818 if (FD->getStorageClass() == SC_Static &&
819 !FD->isInlineSpecified() &&
820 !SourceMgr.isInMainFile(
821 SourceMgr.getExpansionLoc(FD->getLocation())))
822 Diag(DiagD->getLocation(),
823 diag::warn_unneeded_static_internal_decl)
824 << DiagD->getDeclName();
826 Diag(DiagD->getLocation(), diag::warn_unneeded_internal_decl)
827 << /*function*/0 << DiagD->getDeclName();
830 Diag(DiagD->getLocation(),
831 isa<CXXMethodDecl>(DiagD) ? diag::warn_unused_member_function
832 : diag::warn_unused_function)
833 << DiagD->getDeclName();
836 const VarDecl *DiagD = cast<VarDecl>(*I)->getDefinition();
838 DiagD = cast<VarDecl>(*I);
839 if (DiagD->isReferenced()) {
840 Diag(DiagD->getLocation(), diag::warn_unneeded_internal_decl)
841 << /*variable*/1 << DiagD->getDeclName();
842 } else if (DiagD->getType().isConstQualified()) {
843 Diag(DiagD->getLocation(), diag::warn_unused_const_variable)
844 << DiagD->getDeclName();
846 Diag(DiagD->getLocation(), diag::warn_unused_variable)
847 << DiagD->getDeclName();
853 ExternalSource->ReadUndefinedButUsed(UndefinedButUsed);
854 checkUndefinedButUsed(*this);
856 emitAndClearUnusedLocalTypedefWarnings();
859 if (!Diags.isIgnored(diag::warn_unused_private_field, SourceLocation())) {
860 RecordCompleteMap RecordsComplete;
861 RecordCompleteMap MNCComplete;
862 for (NamedDeclSetType::iterator I = UnusedPrivateFields.begin(),
863 E = UnusedPrivateFields.end(); I != E; ++I) {
864 const NamedDecl *D = *I;
865 const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(D->getDeclContext());
866 if (RD && !RD->isUnion() &&
867 IsRecordFullyDefined(RD, RecordsComplete, MNCComplete)) {
868 Diag(D->getLocation(), diag::warn_unused_private_field)
874 if (!Diags.isIgnored(diag::warn_mismatched_delete_new, SourceLocation())) {
876 ExternalSource->ReadMismatchingDeleteExpressions(DeleteExprs);
877 for (const auto &DeletedFieldInfo : DeleteExprs) {
878 for (const auto &DeleteExprLoc : DeletedFieldInfo.second) {
879 AnalyzeDeleteExprMismatch(DeletedFieldInfo.first, DeleteExprLoc.first,
880 DeleteExprLoc.second);
885 // Check we've noticed that we're no longer parsing the initializer for every
886 // variable. If we miss cases, then at best we have a performance issue and
887 // at worst a rejects-valid bug.
888 assert(ParsingInitForAutoVars.empty() &&
889 "Didn't unmark var as having its initializer parsed");
895 //===----------------------------------------------------------------------===//
897 //===----------------------------------------------------------------------===//
899 DeclContext *Sema::getFunctionLevelDeclContext() {
900 DeclContext *DC = CurContext;
903 if (isa<BlockDecl>(DC) || isa<EnumDecl>(DC) || isa<CapturedDecl>(DC)) {
904 DC = DC->getParent();
905 } else if (isa<CXXMethodDecl>(DC) &&
906 cast<CXXMethodDecl>(DC)->getOverloadedOperator() == OO_Call &&
907 cast<CXXRecordDecl>(DC->getParent())->isLambda()) {
908 DC = DC->getParent()->getParent();
916 /// getCurFunctionDecl - If inside of a function body, this returns a pointer
917 /// to the function decl for the function being parsed. If we're currently
918 /// in a 'block', this returns the containing context.
919 FunctionDecl *Sema::getCurFunctionDecl() {
920 DeclContext *DC = getFunctionLevelDeclContext();
921 return dyn_cast<FunctionDecl>(DC);
924 ObjCMethodDecl *Sema::getCurMethodDecl() {
925 DeclContext *DC = getFunctionLevelDeclContext();
926 while (isa<RecordDecl>(DC))
927 DC = DC->getParent();
928 return dyn_cast<ObjCMethodDecl>(DC);
931 NamedDecl *Sema::getCurFunctionOrMethodDecl() {
932 DeclContext *DC = getFunctionLevelDeclContext();
933 if (isa<ObjCMethodDecl>(DC) || isa<FunctionDecl>(DC))
934 return cast<NamedDecl>(DC);
938 void Sema::EmitCurrentDiagnostic(unsigned DiagID) {
939 // FIXME: It doesn't make sense to me that DiagID is an incoming argument here
940 // and yet we also use the current diag ID on the DiagnosticsEngine. This has
941 // been made more painfully obvious by the refactor that introduced this
942 // function, but it is possible that the incoming argument can be
943 // eliminnated. If it truly cannot be (for example, there is some reentrancy
944 // issue I am not seeing yet), then there should at least be a clarifying
945 // comment somewhere.
946 if (Optional<TemplateDeductionInfo*> Info = isSFINAEContext()) {
947 switch (DiagnosticIDs::getDiagnosticSFINAEResponse(
948 Diags.getCurrentDiagID())) {
949 case DiagnosticIDs::SFINAE_Report:
950 // We'll report the diagnostic below.
953 case DiagnosticIDs::SFINAE_SubstitutionFailure:
954 // Count this failure so that we know that template argument deduction
958 // Make a copy of this suppressed diagnostic and store it with the
959 // template-deduction information.
960 if (*Info && !(*Info)->hasSFINAEDiagnostic()) {
961 Diagnostic DiagInfo(&Diags);
962 (*Info)->addSFINAEDiagnostic(DiagInfo.getLocation(),
963 PartialDiagnostic(DiagInfo, Context.getDiagAllocator()));
966 Diags.setLastDiagnosticIgnored();
970 case DiagnosticIDs::SFINAE_AccessControl: {
971 // Per C++ Core Issue 1170, access control is part of SFINAE.
972 // Additionally, the AccessCheckingSFINAE flag can be used to temporarily
973 // make access control a part of SFINAE for the purposes of checking
975 if (!AccessCheckingSFINAE && !getLangOpts().CPlusPlus11)
978 SourceLocation Loc = Diags.getCurrentDiagLoc();
980 // Suppress this diagnostic.
983 // Make a copy of this suppressed diagnostic and store it with the
984 // template-deduction information.
985 if (*Info && !(*Info)->hasSFINAEDiagnostic()) {
986 Diagnostic DiagInfo(&Diags);
987 (*Info)->addSFINAEDiagnostic(DiagInfo.getLocation(),
988 PartialDiagnostic(DiagInfo, Context.getDiagAllocator()));
991 Diags.setLastDiagnosticIgnored();
994 // Now the diagnostic state is clear, produce a C++98 compatibility
996 Diag(Loc, diag::warn_cxx98_compat_sfinae_access_control);
998 // The last diagnostic which Sema produced was ignored. Suppress any
999 // notes attached to it.
1000 Diags.setLastDiagnosticIgnored();
1004 case DiagnosticIDs::SFINAE_Suppress:
1005 // Make a copy of this suppressed diagnostic and store it with the
1006 // template-deduction information;
1008 Diagnostic DiagInfo(&Diags);
1009 (*Info)->addSuppressedDiagnostic(DiagInfo.getLocation(),
1010 PartialDiagnostic(DiagInfo, Context.getDiagAllocator()));
1013 // Suppress this diagnostic.
1014 Diags.setLastDiagnosticIgnored();
1020 // Set up the context's printing policy based on our current state.
1021 Context.setPrintingPolicy(getPrintingPolicy());
1023 // Emit the diagnostic.
1024 if (!Diags.EmitCurrentDiagnostic())
1027 // If this is not a note, and we're in a template instantiation
1028 // that is different from the last template instantiation where
1029 // we emitted an error, print a template instantiation
1031 if (!DiagnosticIDs::isBuiltinNote(DiagID) &&
1032 !ActiveTemplateInstantiations.empty() &&
1033 ActiveTemplateInstantiations.back()
1034 != LastTemplateInstantiationErrorContext) {
1035 PrintInstantiationStack();
1036 LastTemplateInstantiationErrorContext = ActiveTemplateInstantiations.back();
1040 Sema::SemaDiagnosticBuilder
1041 Sema::Diag(SourceLocation Loc, const PartialDiagnostic& PD) {
1042 SemaDiagnosticBuilder Builder(Diag(Loc, PD.getDiagID()));
1048 /// \brief Looks through the macro-expansion chain for the given
1049 /// location, looking for a macro expansion with the given name.
1050 /// If one is found, returns true and sets the location to that
1052 bool Sema::findMacroSpelling(SourceLocation &locref, StringRef name) {
1053 SourceLocation loc = locref;
1054 if (!loc.isMacroID()) return false;
1056 // There's no good way right now to look at the intermediate
1057 // expansions, so just jump to the expansion location.
1058 loc = getSourceManager().getExpansionLoc(loc);
1060 // If that's written with the name, stop here.
1061 SmallVector<char, 16> buffer;
1062 if (getPreprocessor().getSpelling(loc, buffer) == name) {
1069 /// \brief Determines the active Scope associated with the given declaration
1072 /// This routine maps a declaration context to the active Scope object that
1073 /// represents that declaration context in the parser. It is typically used
1074 /// from "scope-less" code (e.g., template instantiation, lazy creation of
1075 /// declarations) that injects a name for name-lookup purposes and, therefore,
1076 /// must update the Scope.
1078 /// \returns The scope corresponding to the given declaraion context, or NULL
1079 /// if no such scope is open.
1080 Scope *Sema::getScopeForContext(DeclContext *Ctx) {
1085 Ctx = Ctx->getPrimaryContext();
1086 for (Scope *S = getCurScope(); S; S = S->getParent()) {
1087 // Ignore scopes that cannot have declarations. This is important for
1088 // out-of-line definitions of static class members.
1089 if (S->getFlags() & (Scope::DeclScope | Scope::TemplateParamScope))
1090 if (DeclContext *Entity = S->getEntity())
1091 if (Ctx == Entity->getPrimaryContext())
1098 /// \brief Enter a new function scope
1099 void Sema::PushFunctionScope() {
1100 if (FunctionScopes.size() == 1) {
1101 // Use the "top" function scope rather than having to allocate
1102 // memory for a new scope.
1103 FunctionScopes.back()->Clear();
1104 FunctionScopes.push_back(FunctionScopes.back());
1108 FunctionScopes.push_back(new FunctionScopeInfo(getDiagnostics()));
1111 void Sema::PushBlockScope(Scope *BlockScope, BlockDecl *Block) {
1112 FunctionScopes.push_back(new BlockScopeInfo(getDiagnostics(),
1113 BlockScope, Block));
1116 LambdaScopeInfo *Sema::PushLambdaScope() {
1117 LambdaScopeInfo *const LSI = new LambdaScopeInfo(getDiagnostics());
1118 FunctionScopes.push_back(LSI);
1122 void Sema::RecordParsingTemplateParameterDepth(unsigned Depth) {
1123 if (LambdaScopeInfo *const LSI = getCurLambda()) {
1124 LSI->AutoTemplateParameterDepth = Depth;
1128 "Remove assertion if intentionally called in a non-lambda context.");
1131 void Sema::PopFunctionScopeInfo(const AnalysisBasedWarnings::Policy *WP,
1132 const Decl *D, const BlockExpr *blkExpr) {
1133 FunctionScopeInfo *Scope = FunctionScopes.pop_back_val();
1134 assert(!FunctionScopes.empty() && "mismatched push/pop!");
1136 // Issue any analysis-based warnings.
1138 AnalysisWarnings.IssueWarnings(*WP, Scope, D, blkExpr);
1140 for (const auto &PUD : Scope->PossiblyUnreachableDiags)
1141 Diag(PUD.Loc, PUD.PD);
1143 if (FunctionScopes.back() != Scope)
1147 void Sema::PushCompoundScope() {
1148 getCurFunction()->CompoundScopes.push_back(CompoundScopeInfo());
1151 void Sema::PopCompoundScope() {
1152 FunctionScopeInfo *CurFunction = getCurFunction();
1153 assert(!CurFunction->CompoundScopes.empty() && "mismatched push/pop");
1155 CurFunction->CompoundScopes.pop_back();
1158 /// \brief Determine whether any errors occurred within this function/method/
1160 bool Sema::hasAnyUnrecoverableErrorsInThisFunction() const {
1161 return getCurFunction()->ErrorTrap.hasUnrecoverableErrorOccurred();
1164 BlockScopeInfo *Sema::getCurBlock() {
1165 if (FunctionScopes.empty())
1168 auto CurBSI = dyn_cast<BlockScopeInfo>(FunctionScopes.back());
1169 if (CurBSI && CurBSI->TheDecl &&
1170 !CurBSI->TheDecl->Encloses(CurContext)) {
1171 // We have switched contexts due to template instantiation.
1172 assert(!ActiveTemplateInstantiations.empty());
1179 LambdaScopeInfo *Sema::getCurLambda() {
1180 if (FunctionScopes.empty())
1183 auto CurLSI = dyn_cast<LambdaScopeInfo>(FunctionScopes.back());
1184 if (CurLSI && CurLSI->Lambda &&
1185 !CurLSI->Lambda->Encloses(CurContext)) {
1186 // We have switched contexts due to template instantiation.
1187 assert(!ActiveTemplateInstantiations.empty());
1193 // We have a generic lambda if we parsed auto parameters, or we have
1194 // an associated template parameter list.
1195 LambdaScopeInfo *Sema::getCurGenericLambda() {
1196 if (LambdaScopeInfo *LSI = getCurLambda()) {
1197 return (LSI->AutoTemplateParams.size() ||
1198 LSI->GLTemplateParameterList) ? LSI : nullptr;
1204 void Sema::ActOnComment(SourceRange Comment) {
1205 if (!LangOpts.RetainCommentsFromSystemHeaders &&
1206 SourceMgr.isInSystemHeader(Comment.getBegin()))
1208 RawComment RC(SourceMgr, Comment, false,
1209 LangOpts.CommentOpts.ParseAllComments);
1210 if (RC.isAlmostTrailingComment()) {
1211 SourceRange MagicMarkerRange(Comment.getBegin(),
1212 Comment.getBegin().getLocWithOffset(3));
1213 StringRef MagicMarkerText;
1214 switch (RC.getKind()) {
1215 case RawComment::RCK_OrdinaryBCPL:
1216 MagicMarkerText = "///<";
1218 case RawComment::RCK_OrdinaryC:
1219 MagicMarkerText = "/**<";
1222 llvm_unreachable("if this is an almost Doxygen comment, "
1223 "it should be ordinary");
1225 Diag(Comment.getBegin(), diag::warn_not_a_doxygen_trailing_member_comment) <<
1226 FixItHint::CreateReplacement(MagicMarkerRange, MagicMarkerText);
1228 Context.addComment(RC);
1231 // Pin this vtable to this file.
1232 ExternalSemaSource::~ExternalSemaSource() {}
1234 void ExternalSemaSource::ReadMethodPool(Selector Sel) { }
1236 void ExternalSemaSource::ReadKnownNamespaces(
1237 SmallVectorImpl<NamespaceDecl *> &Namespaces) {
1240 void ExternalSemaSource::ReadUndefinedButUsed(
1241 llvm::DenseMap<NamedDecl *, SourceLocation> &Undefined) {
1244 void ExternalSemaSource::ReadMismatchingDeleteExpressions(llvm::MapVector<
1245 FieldDecl *, llvm::SmallVector<std::pair<SourceLocation, bool>, 4>> &) {}
1247 void PrettyDeclStackTraceEntry::print(raw_ostream &OS) const {
1248 SourceLocation Loc = this->Loc;
1249 if (!Loc.isValid() && TheDecl) Loc = TheDecl->getLocation();
1250 if (Loc.isValid()) {
1251 Loc.print(OS, S.getSourceManager());
1256 if (TheDecl && isa<NamedDecl>(TheDecl)) {
1257 std::string Name = cast<NamedDecl>(TheDecl)->getNameAsString();
1259 OS << " '" << Name << '\'';
1265 /// \brief Figure out if an expression could be turned into a call.
1267 /// Use this when trying to recover from an error where the programmer may have
1268 /// written just the name of a function instead of actually calling it.
1270 /// \param E - The expression to examine.
1271 /// \param ZeroArgCallReturnTy - If the expression can be turned into a call
1272 /// with no arguments, this parameter is set to the type returned by such a
1273 /// call; otherwise, it is set to an empty QualType.
1274 /// \param OverloadSet - If the expression is an overloaded function
1275 /// name, this parameter is populated with the decls of the various overloads.
1276 bool Sema::tryExprAsCall(Expr &E, QualType &ZeroArgCallReturnTy,
1277 UnresolvedSetImpl &OverloadSet) {
1278 ZeroArgCallReturnTy = QualType();
1279 OverloadSet.clear();
1281 const OverloadExpr *Overloads = nullptr;
1282 bool IsMemExpr = false;
1283 if (E.getType() == Context.OverloadTy) {
1284 OverloadExpr::FindResult FR = OverloadExpr::find(const_cast<Expr*>(&E));
1286 // Ignore overloads that are pointer-to-member constants.
1287 if (FR.HasFormOfMemberPointer)
1290 Overloads = FR.Expression;
1291 } else if (E.getType() == Context.BoundMemberTy) {
1292 Overloads = dyn_cast<UnresolvedMemberExpr>(E.IgnoreParens());
1296 bool Ambiguous = false;
1299 for (OverloadExpr::decls_iterator it = Overloads->decls_begin(),
1300 DeclsEnd = Overloads->decls_end(); it != DeclsEnd; ++it) {
1301 OverloadSet.addDecl(*it);
1303 // Check whether the function is a non-template, non-member which takes no
1307 if (const FunctionDecl *OverloadDecl
1308 = dyn_cast<FunctionDecl>((*it)->getUnderlyingDecl())) {
1309 if (OverloadDecl->getMinRequiredArguments() == 0) {
1310 if (!ZeroArgCallReturnTy.isNull() && !Ambiguous) {
1311 ZeroArgCallReturnTy = QualType();
1314 ZeroArgCallReturnTy = OverloadDecl->getReturnType();
1319 // If it's not a member, use better machinery to try to resolve the call
1321 return !ZeroArgCallReturnTy.isNull();
1324 // Attempt to call the member with no arguments - this will correctly handle
1325 // member templates with defaults/deduction of template arguments, overloads
1326 // with default arguments, etc.
1327 if (IsMemExpr && !E.isTypeDependent()) {
1328 bool Suppress = getDiagnostics().getSuppressAllDiagnostics();
1329 getDiagnostics().setSuppressAllDiagnostics(true);
1330 ExprResult R = BuildCallToMemberFunction(nullptr, &E, SourceLocation(),
1331 None, SourceLocation());
1332 getDiagnostics().setSuppressAllDiagnostics(Suppress);
1334 ZeroArgCallReturnTy = R.get()->getType();
1340 if (const DeclRefExpr *DeclRef = dyn_cast<DeclRefExpr>(E.IgnoreParens())) {
1341 if (const FunctionDecl *Fun = dyn_cast<FunctionDecl>(DeclRef->getDecl())) {
1342 if (Fun->getMinRequiredArguments() == 0)
1343 ZeroArgCallReturnTy = Fun->getReturnType();
1348 // We don't have an expression that's convenient to get a FunctionDecl from,
1349 // but we can at least check if the type is "function of 0 arguments".
1350 QualType ExprTy = E.getType();
1351 const FunctionType *FunTy = nullptr;
1352 QualType PointeeTy = ExprTy->getPointeeType();
1353 if (!PointeeTy.isNull())
1354 FunTy = PointeeTy->getAs<FunctionType>();
1356 FunTy = ExprTy->getAs<FunctionType>();
1358 if (const FunctionProtoType *FPT =
1359 dyn_cast_or_null<FunctionProtoType>(FunTy)) {
1360 if (FPT->getNumParams() == 0)
1361 ZeroArgCallReturnTy = FunTy->getReturnType();
1367 /// \brief Give notes for a set of overloads.
1369 /// A companion to tryExprAsCall. In cases when the name that the programmer
1370 /// wrote was an overloaded function, we may be able to make some guesses about
1371 /// plausible overloads based on their return types; such guesses can be handed
1372 /// off to this method to be emitted as notes.
1374 /// \param Overloads - The overloads to note.
1375 /// \param FinalNoteLoc - If we've suppressed printing some overloads due to
1376 /// -fshow-overloads=best, this is the location to attach to the note about too
1377 /// many candidates. Typically this will be the location of the original
1378 /// ill-formed expression.
1379 static void noteOverloads(Sema &S, const UnresolvedSetImpl &Overloads,
1380 const SourceLocation FinalNoteLoc) {
1381 int ShownOverloads = 0;
1382 int SuppressedOverloads = 0;
1383 for (UnresolvedSetImpl::iterator It = Overloads.begin(),
1384 DeclsEnd = Overloads.end(); It != DeclsEnd; ++It) {
1385 // FIXME: Magic number for max shown overloads stolen from
1386 // OverloadCandidateSet::NoteCandidates.
1387 if (ShownOverloads >= 4 && S.Diags.getShowOverloads() == Ovl_Best) {
1388 ++SuppressedOverloads;
1392 NamedDecl *Fn = (*It)->getUnderlyingDecl();
1393 S.Diag(Fn->getLocation(), diag::note_possible_target_of_call);
1397 if (SuppressedOverloads)
1398 S.Diag(FinalNoteLoc, diag::note_ovl_too_many_candidates)
1399 << SuppressedOverloads;
1402 static void notePlausibleOverloads(Sema &S, SourceLocation Loc,
1403 const UnresolvedSetImpl &Overloads,
1404 bool (*IsPlausibleResult)(QualType)) {
1405 if (!IsPlausibleResult)
1406 return noteOverloads(S, Overloads, Loc);
1408 UnresolvedSet<2> PlausibleOverloads;
1409 for (OverloadExpr::decls_iterator It = Overloads.begin(),
1410 DeclsEnd = Overloads.end(); It != DeclsEnd; ++It) {
1411 const FunctionDecl *OverloadDecl = cast<FunctionDecl>(*It);
1412 QualType OverloadResultTy = OverloadDecl->getReturnType();
1413 if (IsPlausibleResult(OverloadResultTy))
1414 PlausibleOverloads.addDecl(It.getDecl());
1416 noteOverloads(S, PlausibleOverloads, Loc);
1419 /// Determine whether the given expression can be called by just
1420 /// putting parentheses after it. Notably, expressions with unary
1421 /// operators can't be because the unary operator will start parsing
1422 /// outside the call.
1423 static bool IsCallableWithAppend(Expr *E) {
1424 E = E->IgnoreImplicit();
1425 return (!isa<CStyleCastExpr>(E) &&
1426 !isa<UnaryOperator>(E) &&
1427 !isa<BinaryOperator>(E) &&
1428 !isa<CXXOperatorCallExpr>(E));
1431 bool Sema::tryToRecoverWithCall(ExprResult &E, const PartialDiagnostic &PD,
1433 bool (*IsPlausibleResult)(QualType)) {
1434 SourceLocation Loc = E.get()->getExprLoc();
1435 SourceRange Range = E.get()->getSourceRange();
1437 QualType ZeroArgCallTy;
1438 UnresolvedSet<4> Overloads;
1439 if (tryExprAsCall(*E.get(), ZeroArgCallTy, Overloads) &&
1440 !ZeroArgCallTy.isNull() &&
1441 (!IsPlausibleResult || IsPlausibleResult(ZeroArgCallTy))) {
1442 // At this point, we know E is potentially callable with 0
1443 // arguments and that it returns something of a reasonable type,
1444 // so we can emit a fixit and carry on pretending that E was
1445 // actually a CallExpr.
1446 SourceLocation ParenInsertionLoc = PP.getLocForEndOfToken(Range.getEnd());
1448 << /*zero-arg*/ 1 << Range
1449 << (IsCallableWithAppend(E.get())
1450 ? FixItHint::CreateInsertion(ParenInsertionLoc, "()")
1452 notePlausibleOverloads(*this, Loc, Overloads, IsPlausibleResult);
1454 // FIXME: Try this before emitting the fixit, and suppress diagnostics
1456 E = ActOnCallExpr(nullptr, E.get(), Range.getEnd(), None,
1457 Range.getEnd().getLocWithOffset(1));
1461 if (!ForceComplain) return false;
1463 Diag(Loc, PD) << /*not zero-arg*/ 0 << Range;
1464 notePlausibleOverloads(*this, Loc, Overloads, IsPlausibleResult);
1469 IdentifierInfo *Sema::getSuperIdentifier() const {
1471 Ident_super = &Context.Idents.get("super");
1475 IdentifierInfo *Sema::getFloat128Identifier() const {
1476 if (!Ident___float128)
1477 Ident___float128 = &Context.Idents.get("__float128");
1478 return Ident___float128;
1481 void Sema::PushCapturedRegionScope(Scope *S, CapturedDecl *CD, RecordDecl *RD,
1482 CapturedRegionKind K) {
1483 CapturingScopeInfo *CSI = new CapturedRegionScopeInfo(
1484 getDiagnostics(), S, CD, RD, CD->getContextParam(), K);
1485 CSI->ReturnType = Context.VoidTy;
1486 FunctionScopes.push_back(CSI);
1489 CapturedRegionScopeInfo *Sema::getCurCapturedRegion() {
1490 if (FunctionScopes.empty())
1493 return dyn_cast<CapturedRegionScopeInfo>(FunctionScopes.back());
1496 const llvm::MapVector<FieldDecl *, Sema::DeleteLocs> &
1497 Sema::getMismatchingDeleteExpressions() const {