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 using namespace clang;
46 SourceLocation Sema::getLocForEndOfToken(SourceLocation Loc, unsigned Offset) {
47 return Lexer::getLocForEndOfToken(Loc, Offset, SourceMgr, LangOpts);
50 ModuleLoader &Sema::getModuleLoader() const { return PP.getModuleLoader(); }
52 PrintingPolicy Sema::getPrintingPolicy(const ASTContext &Context,
53 const Preprocessor &PP) {
54 PrintingPolicy Policy = Context.getPrintingPolicy();
55 Policy.Bool = Context.getLangOpts().Bool;
58 BoolMacro = PP.getMacroInfo(&Context.Idents.get("bool"))) {
59 Policy.Bool = BoolMacro->isObjectLike() &&
60 BoolMacro->getNumTokens() == 1 &&
61 BoolMacro->getReplacementToken(0).is(tok::kw__Bool);
68 void Sema::ActOnTranslationUnitScope(Scope *S) {
70 PushDeclContext(S, Context.getTranslationUnitDecl());
73 Sema::Sema(Preprocessor &pp, ASTContext &ctxt, ASTConsumer &consumer,
74 TranslationUnitKind TUKind,
75 CodeCompleteConsumer *CodeCompleter)
76 : ExternalSource(nullptr),
77 isMultiplexExternalSource(false), FPFeatures(pp.getLangOpts()),
78 LangOpts(pp.getLangOpts()), PP(pp), Context(ctxt), Consumer(consumer),
79 Diags(PP.getDiagnostics()), SourceMgr(PP.getSourceManager()),
80 CollectStats(false), CodeCompleter(CodeCompleter),
81 CurContext(nullptr), OriginalLexicalContext(nullptr),
82 PackContext(nullptr), MSStructPragmaOn(false),
83 MSPointerToMemberRepresentationMethod(
84 LangOpts.getMSPointerToMemberRepresentationMethod()),
85 VtorDispModeStack(1, MSVtorDispAttr::Mode(LangOpts.VtorDispMode)),
86 DataSegStack(nullptr), BSSSegStack(nullptr), ConstSegStack(nullptr),
87 CodeSegStack(nullptr), CurInitSeg(nullptr), VisContext(nullptr),
88 IsBuildingRecoveryCallExpr(false),
89 ExprNeedsCleanups(false), LateTemplateParser(nullptr),
90 LateTemplateParserCleanup(nullptr),
91 OpaqueParser(nullptr), IdResolver(pp), StdInitializerList(nullptr),
92 CXXTypeInfoDecl(nullptr), MSVCGuidDecl(nullptr),
93 NSNumberDecl(nullptr), NSValueDecl(nullptr),
94 NSStringDecl(nullptr), StringWithUTF8StringMethod(nullptr),
95 ValueWithBytesObjCTypeMethod(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 Diags.SetArgToStringFn(&FormatASTNodeDiagnosticArgument, &Context);
125 ExprEvalContexts.emplace_back(PotentiallyEvaluated, 0, false, nullptr, false);
127 FunctionScopes.push_back(new FunctionScopeInfo(Diags));
129 // Initilization of data sharing attributes stack for OpenMP
130 InitDataSharingAttributesStack();
133 void Sema::addImplicitTypedef(StringRef Name, QualType T) {
134 DeclarationName DN = &Context.Idents.get(Name);
135 if (IdResolver.begin(DN) == IdResolver.end())
136 PushOnScopeChains(Context.buildImplicitTypedef(T, Name), TUScope);
139 void Sema::Initialize() {
140 if (SemaConsumer *SC = dyn_cast<SemaConsumer>(&Consumer))
141 SC->InitializeSema(*this);
143 // Tell the external Sema source about this Sema object.
144 if (ExternalSemaSource *ExternalSema
145 = dyn_cast_or_null<ExternalSemaSource>(Context.getExternalSource()))
146 ExternalSema->InitializeSema(*this);
148 // This needs to happen after ExternalSemaSource::InitializeSema(this) or we
149 // will not be able to merge any duplicate __va_list_tag decls correctly.
150 VAListTagName = PP.getIdentifierInfo("__va_list_tag");
155 // Initialize predefined 128-bit integer types, if needed.
156 if (Context.getTargetInfo().hasInt128Type()) {
157 // If either of the 128-bit integer types are unavailable to name lookup,
159 DeclarationName Int128 = &Context.Idents.get("__int128_t");
160 if (IdResolver.begin(Int128) == IdResolver.end())
161 PushOnScopeChains(Context.getInt128Decl(), TUScope);
163 DeclarationName UInt128 = &Context.Idents.get("__uint128_t");
164 if (IdResolver.begin(UInt128) == IdResolver.end())
165 PushOnScopeChains(Context.getUInt128Decl(), TUScope);
169 // Initialize predefined Objective-C types:
170 if (getLangOpts().ObjC1) {
171 // If 'SEL' does not yet refer to any declarations, make it refer to the
173 DeclarationName SEL = &Context.Idents.get("SEL");
174 if (IdResolver.begin(SEL) == IdResolver.end())
175 PushOnScopeChains(Context.getObjCSelDecl(), TUScope);
177 // If 'id' does not yet refer to any declarations, make it refer to the
179 DeclarationName Id = &Context.Idents.get("id");
180 if (IdResolver.begin(Id) == IdResolver.end())
181 PushOnScopeChains(Context.getObjCIdDecl(), TUScope);
183 // Create the built-in typedef for 'Class'.
184 DeclarationName Class = &Context.Idents.get("Class");
185 if (IdResolver.begin(Class) == IdResolver.end())
186 PushOnScopeChains(Context.getObjCClassDecl(), TUScope);
188 // Create the built-in forward declaratino for 'Protocol'.
189 DeclarationName Protocol = &Context.Idents.get("Protocol");
190 if (IdResolver.begin(Protocol) == IdResolver.end())
191 PushOnScopeChains(Context.getObjCProtocolDecl(), TUScope);
194 // Initialize Microsoft "predefined C++ types".
195 if (getLangOpts().MSVCCompat) {
196 if (getLangOpts().CPlusPlus &&
197 IdResolver.begin(&Context.Idents.get("type_info")) == IdResolver.end())
198 PushOnScopeChains(Context.buildImplicitRecord("type_info", TTK_Class),
201 addImplicitTypedef("size_t", Context.getSizeType());
204 // Initialize predefined OpenCL types.
205 if (getLangOpts().OpenCL) {
206 addImplicitTypedef("image1d_t", Context.OCLImage1dTy);
207 addImplicitTypedef("image1d_array_t", Context.OCLImage1dArrayTy);
208 addImplicitTypedef("image1d_buffer_t", Context.OCLImage1dBufferTy);
209 addImplicitTypedef("image2d_t", Context.OCLImage2dTy);
210 addImplicitTypedef("image2d_array_t", Context.OCLImage2dArrayTy);
211 addImplicitTypedef("image3d_t", Context.OCLImage3dTy);
212 addImplicitTypedef("sampler_t", Context.OCLSamplerTy);
213 addImplicitTypedef("event_t", Context.OCLEventTy);
214 if (getLangOpts().OpenCLVersion >= 200) {
215 addImplicitTypedef("image2d_depth_t", Context.OCLImage2dDepthTy);
216 addImplicitTypedef("image2d_array_depth_t",
217 Context.OCLImage2dArrayDepthTy);
218 addImplicitTypedef("image2d_msaa_t", Context.OCLImage2dMSAATy);
219 addImplicitTypedef("image2d_array_msaa_t", Context.OCLImage2dArrayMSAATy);
220 addImplicitTypedef("image2d_msaa_depth_t", Context.OCLImage2dMSAADepthTy);
221 addImplicitTypedef("image2d_array_msaa_depth_t",
222 Context.OCLImage2dArrayMSAADepthTy);
223 addImplicitTypedef("clk_event_t", Context.OCLClkEventTy);
224 addImplicitTypedef("queue_t", Context.OCLQueueTy);
225 addImplicitTypedef("ndrange_t", Context.OCLNDRangeTy);
226 addImplicitTypedef("reserve_id_t", Context.OCLReserveIDTy);
227 addImplicitTypedef("atomic_int", Context.getAtomicType(Context.IntTy));
228 addImplicitTypedef("atomic_uint",
229 Context.getAtomicType(Context.UnsignedIntTy));
230 addImplicitTypedef("atomic_long", Context.getAtomicType(Context.LongTy));
231 addImplicitTypedef("atomic_ulong",
232 Context.getAtomicType(Context.UnsignedLongTy));
233 addImplicitTypedef("atomic_float",
234 Context.getAtomicType(Context.FloatTy));
235 addImplicitTypedef("atomic_double",
236 Context.getAtomicType(Context.DoubleTy));
237 // OpenCLC v2.0, s6.13.11.6 requires that atomic_flag is implemented as
238 // 32-bit integer and OpenCLC v2.0, s6.1.1 int is always 32-bit wide.
239 addImplicitTypedef("atomic_flag", Context.getAtomicType(Context.IntTy));
240 addImplicitTypedef("atomic_intptr_t",
241 Context.getAtomicType(Context.getIntPtrType()));
242 addImplicitTypedef("atomic_uintptr_t",
243 Context.getAtomicType(Context.getUIntPtrType()));
244 addImplicitTypedef("atomic_size_t",
245 Context.getAtomicType(Context.getSizeType()));
246 addImplicitTypedef("atomic_ptrdiff_t",
247 Context.getAtomicType(Context.getPointerDiffType()));
251 if (Context.getTargetInfo().hasBuiltinMSVaList()) {
252 DeclarationName MSVaList = &Context.Idents.get("__builtin_ms_va_list");
253 if (IdResolver.begin(MSVaList) == IdResolver.end())
254 PushOnScopeChains(Context.getBuiltinMSVaListDecl(), TUScope);
257 DeclarationName BuiltinVaList = &Context.Idents.get("__builtin_va_list");
258 if (IdResolver.begin(BuiltinVaList) == IdResolver.end())
259 PushOnScopeChains(Context.getBuiltinVaListDecl(), TUScope);
263 llvm::DeleteContainerSeconds(LateParsedTemplateMap);
264 if (PackContext) FreePackedContext();
265 if (VisContext) FreeVisContext();
266 // Kill all the active scopes.
267 for (unsigned I = 1, E = FunctionScopes.size(); I != E; ++I)
268 delete FunctionScopes[I];
269 if (FunctionScopes.size() == 1)
270 delete FunctionScopes[0];
272 // Tell the SemaConsumer to forget about us; we're going out of scope.
273 if (SemaConsumer *SC = dyn_cast<SemaConsumer>(&Consumer))
276 // Detach from the external Sema source.
277 if (ExternalSemaSource *ExternalSema
278 = dyn_cast_or_null<ExternalSemaSource>(Context.getExternalSource()))
279 ExternalSema->ForgetSema();
281 // If Sema's ExternalSource is the multiplexer - we own it.
282 if (isMultiplexExternalSource)
283 delete ExternalSource;
285 threadSafety::threadSafetyCleanup(ThreadSafetyDeclCache);
287 // Destroys data sharing attributes stack for OpenMP
288 DestroyDataSharingAttributesStack();
290 assert(DelayedTypos.empty() && "Uncorrected typos!");
293 /// makeUnavailableInSystemHeader - There is an error in the current
294 /// context. If we're still in a system header, and we can plausibly
295 /// make the relevant declaration unavailable instead of erroring, do
296 /// so and return true.
297 bool Sema::makeUnavailableInSystemHeader(SourceLocation loc,
298 UnavailableAttr::ImplicitReason reason) {
299 // If we're not in a function, it's an error.
300 FunctionDecl *fn = dyn_cast<FunctionDecl>(CurContext);
301 if (!fn) return false;
303 // If we're in template instantiation, it's an error.
304 if (!ActiveTemplateInstantiations.empty())
307 // If that function's not in a system header, it's an error.
308 if (!Context.getSourceManager().isInSystemHeader(loc))
311 // If the function is already unavailable, it's not an error.
312 if (fn->hasAttr<UnavailableAttr>()) return true;
314 fn->addAttr(UnavailableAttr::CreateImplicit(Context, "", reason, loc));
318 ASTMutationListener *Sema::getASTMutationListener() const {
319 return getASTConsumer().GetASTMutationListener();
322 ///\brief Registers an external source. If an external source already exists,
323 /// creates a multiplex external source and appends to it.
325 ///\param[in] E - A non-null external sema source.
327 void Sema::addExternalSource(ExternalSemaSource *E) {
328 assert(E && "Cannot use with NULL ptr");
330 if (!ExternalSource) {
335 if (isMultiplexExternalSource)
336 static_cast<MultiplexExternalSemaSource*>(ExternalSource)->addSource(*E);
338 ExternalSource = new MultiplexExternalSemaSource(*ExternalSource, *E);
339 isMultiplexExternalSource = true;
343 /// \brief Print out statistics about the semantic analysis.
344 void Sema::PrintStats() const {
345 llvm::errs() << "\n*** Semantic Analysis Stats:\n";
346 llvm::errs() << NumSFINAEErrors << " SFINAE diagnostics trapped.\n";
348 BumpAlloc.PrintStats();
349 AnalysisWarnings.PrintStats();
352 void Sema::diagnoseNullableToNonnullConversion(QualType DstType,
354 SourceLocation Loc) {
355 Optional<NullabilityKind> ExprNullability = SrcType->getNullability(Context);
356 if (!ExprNullability || *ExprNullability != NullabilityKind::Nullable)
359 Optional<NullabilityKind> TypeNullability = DstType->getNullability(Context);
360 if (!TypeNullability || *TypeNullability != NullabilityKind::NonNull)
363 Diag(Loc, diag::warn_nullability_lost) << SrcType << DstType;
366 /// ImpCastExprToType - If Expr is not of type 'Type', insert an implicit cast.
367 /// If there is already an implicit cast, merge into the existing one.
368 /// The result is of the given category.
369 ExprResult Sema::ImpCastExprToType(Expr *E, QualType Ty,
370 CastKind Kind, ExprValueKind VK,
371 const CXXCastPath *BasePath,
372 CheckedConversionKind CCK) {
374 if (VK == VK_RValue && !E->isRValue()) {
377 llvm_unreachable("can't implicitly cast lvalue to rvalue with this cast "
379 case CK_LValueToRValue:
380 case CK_ArrayToPointerDecay:
381 case CK_FunctionToPointerDecay:
386 assert((VK == VK_RValue || !E->isRValue()) && "can't cast rvalue to lvalue");
389 diagnoseNullableToNonnullConversion(Ty, E->getType(), E->getLocStart());
391 QualType ExprTy = Context.getCanonicalType(E->getType());
392 QualType TypeTy = Context.getCanonicalType(Ty);
394 if (ExprTy == TypeTy)
397 if (ImplicitCastExpr *ImpCast = dyn_cast<ImplicitCastExpr>(E)) {
398 if (ImpCast->getCastKind() == Kind && (!BasePath || BasePath->empty())) {
399 ImpCast->setType(Ty);
400 ImpCast->setValueKind(VK);
405 return ImplicitCastExpr::Create(Context, Ty, Kind, E, BasePath, VK);
408 /// ScalarTypeToBooleanCastKind - Returns the cast kind corresponding
409 /// to the conversion from scalar type ScalarTy to the Boolean type.
410 CastKind Sema::ScalarTypeToBooleanCastKind(QualType ScalarTy) {
411 switch (ScalarTy->getScalarTypeKind()) {
412 case Type::STK_Bool: return CK_NoOp;
413 case Type::STK_CPointer: return CK_PointerToBoolean;
414 case Type::STK_BlockPointer: return CK_PointerToBoolean;
415 case Type::STK_ObjCObjectPointer: return CK_PointerToBoolean;
416 case Type::STK_MemberPointer: return CK_MemberPointerToBoolean;
417 case Type::STK_Integral: return CK_IntegralToBoolean;
418 case Type::STK_Floating: return CK_FloatingToBoolean;
419 case Type::STK_IntegralComplex: return CK_IntegralComplexToBoolean;
420 case Type::STK_FloatingComplex: return CK_FloatingComplexToBoolean;
425 /// \brief Used to prune the decls of Sema's UnusedFileScopedDecls vector.
426 static bool ShouldRemoveFromUnused(Sema *SemaRef, const DeclaratorDecl *D) {
427 if (D->getMostRecentDecl()->isUsed())
430 if (D->isExternallyVisible())
433 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
434 // UnusedFileScopedDecls stores the first declaration.
435 // The declaration may have become definition so check again.
436 const FunctionDecl *DeclToCheck;
437 if (FD->hasBody(DeclToCheck))
438 return !SemaRef->ShouldWarnIfUnusedFileScopedDecl(DeclToCheck);
440 // Later redecls may add new information resulting in not having to warn,
442 DeclToCheck = FD->getMostRecentDecl();
443 if (DeclToCheck != FD)
444 return !SemaRef->ShouldWarnIfUnusedFileScopedDecl(DeclToCheck);
447 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) {
448 // If a variable usable in constant expressions is referenced,
449 // don't warn if it isn't used: if the value of a variable is required
450 // for the computation of a constant expression, it doesn't make sense to
451 // warn even if the variable isn't odr-used. (isReferenced doesn't
452 // precisely reflect that, but it's a decent approximation.)
453 if (VD->isReferenced() &&
454 VD->isUsableInConstantExpressions(SemaRef->Context))
457 // UnusedFileScopedDecls stores the first declaration.
458 // The declaration may have become definition so check again.
459 const VarDecl *DeclToCheck = VD->getDefinition();
461 return !SemaRef->ShouldWarnIfUnusedFileScopedDecl(DeclToCheck);
463 // Later redecls may add new information resulting in not having to warn,
465 DeclToCheck = VD->getMostRecentDecl();
466 if (DeclToCheck != VD)
467 return !SemaRef->ShouldWarnIfUnusedFileScopedDecl(DeclToCheck);
473 /// Obtains a sorted list of functions that are undefined but ODR-used.
474 void Sema::getUndefinedButUsed(
475 SmallVectorImpl<std::pair<NamedDecl *, SourceLocation> > &Undefined) {
476 for (llvm::DenseMap<NamedDecl *, SourceLocation>::iterator
477 I = UndefinedButUsed.begin(), E = UndefinedButUsed.end();
479 NamedDecl *ND = I->first;
481 // Ignore attributes that have become invalid.
482 if (ND->isInvalidDecl()) continue;
484 // __attribute__((weakref)) is basically a definition.
485 if (ND->hasAttr<WeakRefAttr>()) continue;
487 if (FunctionDecl *FD = dyn_cast<FunctionDecl>(ND)) {
490 if (FD->isExternallyVisible() &&
491 !FD->getMostRecentDecl()->isInlined())
494 if (cast<VarDecl>(ND)->hasDefinition() != VarDecl::DeclarationOnly)
496 if (ND->isExternallyVisible())
500 Undefined.push_back(std::make_pair(ND, I->second));
503 // Sort (in order of use site) so that we're not dependent on the iteration
504 // order through an llvm::DenseMap.
505 SourceManager &SM = Context.getSourceManager();
506 std::sort(Undefined.begin(), Undefined.end(),
507 [&SM](const std::pair<NamedDecl *, SourceLocation> &l,
508 const std::pair<NamedDecl *, SourceLocation> &r) {
509 if (l.second.isValid() && !r.second.isValid())
511 if (!l.second.isValid() && r.second.isValid())
513 if (l.second != r.second)
514 return SM.isBeforeInTranslationUnit(l.second, r.second);
515 return SM.isBeforeInTranslationUnit(l.first->getLocation(),
516 r.first->getLocation());
520 /// checkUndefinedButUsed - Check for undefined objects with internal linkage
521 /// or that are inline.
522 static void checkUndefinedButUsed(Sema &S) {
523 if (S.UndefinedButUsed.empty()) return;
525 // Collect all the still-undefined entities with internal linkage.
526 SmallVector<std::pair<NamedDecl *, SourceLocation>, 16> Undefined;
527 S.getUndefinedButUsed(Undefined);
528 if (Undefined.empty()) return;
530 for (SmallVectorImpl<std::pair<NamedDecl *, SourceLocation> >::iterator
531 I = Undefined.begin(), E = Undefined.end(); I != E; ++I) {
532 NamedDecl *ND = I->first;
534 if (ND->hasAttr<DLLImportAttr>() || ND->hasAttr<DLLExportAttr>()) {
535 // An exported function will always be emitted when defined, so even if
536 // the function is inline, it doesn't have to be emitted in this TU. An
537 // imported function implies that it has been exported somewhere else.
541 if (!ND->isExternallyVisible()) {
542 S.Diag(ND->getLocation(), diag::warn_undefined_internal)
543 << isa<VarDecl>(ND) << ND;
545 assert(cast<FunctionDecl>(ND)->getMostRecentDecl()->isInlined() &&
546 "used object requires definition but isn't inline or internal?");
547 S.Diag(ND->getLocation(), diag::warn_undefined_inline) << ND;
549 if (I->second.isValid())
550 S.Diag(I->second, diag::note_used_here);
554 void Sema::LoadExternalWeakUndeclaredIdentifiers() {
558 SmallVector<std::pair<IdentifierInfo *, WeakInfo>, 4> WeakIDs;
559 ExternalSource->ReadWeakUndeclaredIdentifiers(WeakIDs);
560 for (auto &WeakID : WeakIDs)
561 WeakUndeclaredIdentifiers.insert(WeakID);
565 typedef llvm::DenseMap<const CXXRecordDecl*, bool> RecordCompleteMap;
567 /// \brief Returns true, if all methods and nested classes of the given
568 /// CXXRecordDecl are defined in this translation unit.
570 /// Should only be called from ActOnEndOfTranslationUnit so that all
571 /// definitions are actually read.
572 static bool MethodsAndNestedClassesComplete(const CXXRecordDecl *RD,
573 RecordCompleteMap &MNCComplete) {
574 RecordCompleteMap::iterator Cache = MNCComplete.find(RD);
575 if (Cache != MNCComplete.end())
576 return Cache->second;
577 if (!RD->isCompleteDefinition())
579 bool Complete = true;
580 for (DeclContext::decl_iterator I = RD->decls_begin(),
582 I != E && Complete; ++I) {
583 if (const CXXMethodDecl *M = dyn_cast<CXXMethodDecl>(*I))
584 Complete = M->isDefined() || (M->isPure() && !isa<CXXDestructorDecl>(M));
585 else if (const FunctionTemplateDecl *F = dyn_cast<FunctionTemplateDecl>(*I))
586 // If the template function is marked as late template parsed at this
587 // point, it has not been instantiated and therefore we have not
588 // performed semantic analysis on it yet, so we cannot know if the type
589 // can be considered complete.
590 Complete = !F->getTemplatedDecl()->isLateTemplateParsed() &&
591 F->getTemplatedDecl()->isDefined();
592 else if (const CXXRecordDecl *R = dyn_cast<CXXRecordDecl>(*I)) {
593 if (R->isInjectedClassName())
595 if (R->hasDefinition())
596 Complete = MethodsAndNestedClassesComplete(R->getDefinition(),
602 MNCComplete[RD] = Complete;
606 /// \brief Returns true, if the given CXXRecordDecl is fully defined in this
607 /// translation unit, i.e. all methods are defined or pure virtual and all
608 /// friends, friend functions and nested classes are fully defined in this
609 /// translation unit.
611 /// Should only be called from ActOnEndOfTranslationUnit so that all
612 /// definitions are actually read.
613 static bool IsRecordFullyDefined(const CXXRecordDecl *RD,
614 RecordCompleteMap &RecordsComplete,
615 RecordCompleteMap &MNCComplete) {
616 RecordCompleteMap::iterator Cache = RecordsComplete.find(RD);
617 if (Cache != RecordsComplete.end())
618 return Cache->second;
619 bool Complete = MethodsAndNestedClassesComplete(RD, MNCComplete);
620 for (CXXRecordDecl::friend_iterator I = RD->friend_begin(),
621 E = RD->friend_end();
622 I != E && Complete; ++I) {
623 // Check if friend classes and methods are complete.
624 if (TypeSourceInfo *TSI = (*I)->getFriendType()) {
625 // Friend classes are available as the TypeSourceInfo of the FriendDecl.
626 if (CXXRecordDecl *FriendD = TSI->getType()->getAsCXXRecordDecl())
627 Complete = MethodsAndNestedClassesComplete(FriendD, MNCComplete);
631 // Friend functions are available through the NamedDecl of FriendDecl.
632 if (const FunctionDecl *FD =
633 dyn_cast<FunctionDecl>((*I)->getFriendDecl()))
634 Complete = FD->isDefined();
636 // This is a template friend, give up.
640 RecordsComplete[RD] = Complete;
644 void Sema::emitAndClearUnusedLocalTypedefWarnings() {
646 ExternalSource->ReadUnusedLocalTypedefNameCandidates(
647 UnusedLocalTypedefNameCandidates);
648 for (const TypedefNameDecl *TD : UnusedLocalTypedefNameCandidates) {
649 if (TD->isReferenced())
651 Diag(TD->getLocation(), diag::warn_unused_local_typedef)
652 << isa<TypeAliasDecl>(TD) << TD->getDeclName();
654 UnusedLocalTypedefNameCandidates.clear();
657 /// ActOnEndOfTranslationUnit - This is called at the very end of the
658 /// translation unit when EOF is reached and all but the top-level scope is
660 void Sema::ActOnEndOfTranslationUnit() {
661 assert(DelayedDiagnostics.getCurrentPool() == nullptr
662 && "reached end of translation unit with a pool attached?");
664 // If code completion is enabled, don't perform any end-of-translation-unit
666 if (PP.isCodeCompletionEnabled())
669 // Complete translation units and modules define vtables and perform implicit
670 // instantiations. PCH files do not.
671 if (TUKind != TU_Prefix) {
672 DiagnoseUseOfUnimplementedSelectors();
674 // If DefinedUsedVTables ends up marking any virtual member functions it
675 // might lead to more pending template instantiations, which we then need
679 // C++: Perform implicit template instantiations.
681 // FIXME: When we perform these implicit instantiations, we do not
682 // carefully keep track of the point of instantiation (C++ [temp.point]).
683 // This means that name lookup that occurs within the template
684 // instantiation will always happen at the end of the translation unit,
685 // so it will find some names that are not required to be found. This is
686 // valid, but we could do better by diagnosing if an instantiation uses a
687 // name that was not visible at its first point of instantiation.
688 if (ExternalSource) {
689 // Load pending instantiations from the external source.
690 SmallVector<PendingImplicitInstantiation, 4> Pending;
691 ExternalSource->ReadPendingInstantiations(Pending);
692 PendingInstantiations.insert(PendingInstantiations.begin(),
693 Pending.begin(), Pending.end());
695 PerformPendingInstantiations();
697 if (LateTemplateParserCleanup)
698 LateTemplateParserCleanup(OpaqueParser);
700 CheckDelayedMemberExceptionSpecs();
703 // All delayed member exception specs should be checked or we end up accepting
704 // incompatible declarations.
705 // FIXME: This is wrong for TUKind == TU_Prefix. In that case, we need to
706 // write out the lists to the AST file (if any).
707 assert(DelayedDefaultedMemberExceptionSpecs.empty());
708 assert(DelayedExceptionSpecChecks.empty());
710 // All dllexport classes should have been processed already.
711 assert(DelayedDllExportClasses.empty());
713 // Remove file scoped decls that turned out to be used.
714 UnusedFileScopedDecls.erase(
715 std::remove_if(UnusedFileScopedDecls.begin(nullptr, true),
716 UnusedFileScopedDecls.end(),
717 std::bind1st(std::ptr_fun(ShouldRemoveFromUnused), this)),
718 UnusedFileScopedDecls.end());
720 if (TUKind == TU_Prefix) {
721 // Translation unit prefixes don't need any of the checking below.
726 // Check for #pragma weak identifiers that were never declared
727 LoadExternalWeakUndeclaredIdentifiers();
728 for (auto WeakID : WeakUndeclaredIdentifiers) {
729 if (WeakID.second.getUsed())
732 Decl *PrevDecl = LookupSingleName(TUScope, WeakID.first, SourceLocation(),
734 if (PrevDecl != nullptr &&
735 !(isa<FunctionDecl>(PrevDecl) || isa<VarDecl>(PrevDecl)))
736 Diag(WeakID.second.getLocation(), diag::warn_attribute_wrong_decl_type)
737 << "'weak'" << ExpectedVariableOrFunction;
739 Diag(WeakID.second.getLocation(), diag::warn_weak_identifier_undeclared)
743 if (LangOpts.CPlusPlus11 &&
744 !Diags.isIgnored(diag::warn_delegating_ctor_cycle, SourceLocation()))
745 CheckDelegatingCtorCycles();
747 if (TUKind == TU_Module) {
748 // If we are building a module, resolve all of the exported declarations
750 if (Module *CurrentModule = PP.getCurrentModule()) {
751 ModuleMap &ModMap = PP.getHeaderSearchInfo().getModuleMap();
753 SmallVector<Module *, 2> Stack;
754 Stack.push_back(CurrentModule);
755 while (!Stack.empty()) {
756 Module *Mod = Stack.pop_back_val();
758 // Resolve the exported declarations and conflicts.
759 // FIXME: Actually complain, once we figure out how to teach the
760 // diagnostic client to deal with complaints in the module map at this
762 ModMap.resolveExports(Mod, /*Complain=*/false);
763 ModMap.resolveUses(Mod, /*Complain=*/false);
764 ModMap.resolveConflicts(Mod, /*Complain=*/false);
766 // Queue the submodules, so their exports will also be resolved.
767 Stack.append(Mod->submodule_begin(), Mod->submodule_end());
771 // Warnings emitted in ActOnEndOfTranslationUnit() should be emitted for
772 // modules when they are built, not every time they are used.
773 emitAndClearUnusedLocalTypedefWarnings();
775 // Modules don't need any of the checking below.
781 // A declaration of an identifier for an object that has file
782 // scope without an initializer, and without a storage-class
783 // specifier or with the storage-class specifier static,
784 // constitutes a tentative definition. If a translation unit
785 // contains one or more tentative definitions for an identifier,
786 // and the translation unit contains no external definition for
787 // that identifier, then the behavior is exactly as if the
788 // translation unit contains a file scope declaration of that
789 // identifier, with the composite type as of the end of the
790 // translation unit, with an initializer equal to 0.
791 llvm::SmallSet<VarDecl *, 32> Seen;
792 for (TentativeDefinitionsType::iterator
793 T = TentativeDefinitions.begin(ExternalSource),
794 TEnd = TentativeDefinitions.end();
797 VarDecl *VD = (*T)->getActingDefinition();
799 // If the tentative definition was completed, getActingDefinition() returns
800 // null. If we've already seen this variable before, insert()'s second
801 // return value is false.
802 if (!VD || VD->isInvalidDecl() || !Seen.insert(VD).second)
805 if (const IncompleteArrayType *ArrayT
806 = Context.getAsIncompleteArrayType(VD->getType())) {
807 // Set the length of the array to 1 (C99 6.9.2p5).
808 Diag(VD->getLocation(), diag::warn_tentative_incomplete_array);
809 llvm::APInt One(Context.getTypeSize(Context.getSizeType()), true);
810 QualType T = Context.getConstantArrayType(ArrayT->getElementType(),
811 One, ArrayType::Normal, 0);
813 } else if (RequireCompleteType(VD->getLocation(), VD->getType(),
814 diag::err_tentative_def_incomplete_type))
815 VD->setInvalidDecl();
817 CheckCompleteVariableDeclaration(VD);
819 // Notify the consumer that we've completed a tentative definition.
820 if (!VD->isInvalidDecl())
821 Consumer.CompleteTentativeDefinition(VD);
825 // If there were errors, disable 'unused' warnings since they will mostly be
827 if (!Diags.hasErrorOccurred()) {
828 // Output warning for unused file scoped decls.
829 for (UnusedFileScopedDeclsType::iterator
830 I = UnusedFileScopedDecls.begin(ExternalSource),
831 E = UnusedFileScopedDecls.end(); I != E; ++I) {
832 if (ShouldRemoveFromUnused(this, *I))
835 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(*I)) {
836 const FunctionDecl *DiagD;
837 if (!FD->hasBody(DiagD))
839 if (DiagD->isDeleted())
840 continue; // Deleted functions are supposed to be unused.
841 if (DiagD->isReferenced()) {
842 if (isa<CXXMethodDecl>(DiagD))
843 Diag(DiagD->getLocation(), diag::warn_unneeded_member_function)
844 << DiagD->getDeclName();
846 if (FD->getStorageClass() == SC_Static &&
847 !FD->isInlineSpecified() &&
848 !SourceMgr.isInMainFile(
849 SourceMgr.getExpansionLoc(FD->getLocation())))
850 Diag(DiagD->getLocation(),
851 diag::warn_unneeded_static_internal_decl)
852 << DiagD->getDeclName();
854 Diag(DiagD->getLocation(), diag::warn_unneeded_internal_decl)
855 << /*function*/0 << DiagD->getDeclName();
858 Diag(DiagD->getLocation(),
859 isa<CXXMethodDecl>(DiagD) ? diag::warn_unused_member_function
860 : diag::warn_unused_function)
861 << DiagD->getDeclName();
864 const VarDecl *DiagD = cast<VarDecl>(*I)->getDefinition();
866 DiagD = cast<VarDecl>(*I);
867 if (DiagD->isReferenced()) {
868 Diag(DiagD->getLocation(), diag::warn_unneeded_internal_decl)
869 << /*variable*/1 << DiagD->getDeclName();
870 } else if (DiagD->getType().isConstQualified()) {
871 Diag(DiagD->getLocation(), diag::warn_unused_const_variable)
872 << DiagD->getDeclName();
874 Diag(DiagD->getLocation(), diag::warn_unused_variable)
875 << DiagD->getDeclName();
881 ExternalSource->ReadUndefinedButUsed(UndefinedButUsed);
882 checkUndefinedButUsed(*this);
884 emitAndClearUnusedLocalTypedefWarnings();
887 if (!Diags.isIgnored(diag::warn_unused_private_field, SourceLocation())) {
888 RecordCompleteMap RecordsComplete;
889 RecordCompleteMap MNCComplete;
890 for (NamedDeclSetType::iterator I = UnusedPrivateFields.begin(),
891 E = UnusedPrivateFields.end(); I != E; ++I) {
892 const NamedDecl *D = *I;
893 const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(D->getDeclContext());
894 if (RD && !RD->isUnion() &&
895 IsRecordFullyDefined(RD, RecordsComplete, MNCComplete)) {
896 Diag(D->getLocation(), diag::warn_unused_private_field)
902 if (!Diags.isIgnored(diag::warn_mismatched_delete_new, SourceLocation())) {
904 ExternalSource->ReadMismatchingDeleteExpressions(DeleteExprs);
905 for (const auto &DeletedFieldInfo : DeleteExprs) {
906 for (const auto &DeleteExprLoc : DeletedFieldInfo.second) {
907 AnalyzeDeleteExprMismatch(DeletedFieldInfo.first, DeleteExprLoc.first,
908 DeleteExprLoc.second);
913 // Check we've noticed that we're no longer parsing the initializer for every
914 // variable. If we miss cases, then at best we have a performance issue and
915 // at worst a rejects-valid bug.
916 assert(ParsingInitForAutoVars.empty() &&
917 "Didn't unmark var as having its initializer parsed");
923 //===----------------------------------------------------------------------===//
925 //===----------------------------------------------------------------------===//
927 DeclContext *Sema::getFunctionLevelDeclContext() {
928 DeclContext *DC = CurContext;
931 if (isa<BlockDecl>(DC) || isa<EnumDecl>(DC) || isa<CapturedDecl>(DC)) {
932 DC = DC->getParent();
933 } else if (isa<CXXMethodDecl>(DC) &&
934 cast<CXXMethodDecl>(DC)->getOverloadedOperator() == OO_Call &&
935 cast<CXXRecordDecl>(DC->getParent())->isLambda()) {
936 DC = DC->getParent()->getParent();
944 /// getCurFunctionDecl - If inside of a function body, this returns a pointer
945 /// to the function decl for the function being parsed. If we're currently
946 /// in a 'block', this returns the containing context.
947 FunctionDecl *Sema::getCurFunctionDecl() {
948 DeclContext *DC = getFunctionLevelDeclContext();
949 return dyn_cast<FunctionDecl>(DC);
952 ObjCMethodDecl *Sema::getCurMethodDecl() {
953 DeclContext *DC = getFunctionLevelDeclContext();
954 while (isa<RecordDecl>(DC))
955 DC = DC->getParent();
956 return dyn_cast<ObjCMethodDecl>(DC);
959 NamedDecl *Sema::getCurFunctionOrMethodDecl() {
960 DeclContext *DC = getFunctionLevelDeclContext();
961 if (isa<ObjCMethodDecl>(DC) || isa<FunctionDecl>(DC))
962 return cast<NamedDecl>(DC);
966 void Sema::EmitCurrentDiagnostic(unsigned DiagID) {
967 // FIXME: It doesn't make sense to me that DiagID is an incoming argument here
968 // and yet we also use the current diag ID on the DiagnosticsEngine. This has
969 // been made more painfully obvious by the refactor that introduced this
970 // function, but it is possible that the incoming argument can be
971 // eliminnated. If it truly cannot be (for example, there is some reentrancy
972 // issue I am not seeing yet), then there should at least be a clarifying
973 // comment somewhere.
974 if (Optional<TemplateDeductionInfo*> Info = isSFINAEContext()) {
975 switch (DiagnosticIDs::getDiagnosticSFINAEResponse(
976 Diags.getCurrentDiagID())) {
977 case DiagnosticIDs::SFINAE_Report:
978 // We'll report the diagnostic below.
981 case DiagnosticIDs::SFINAE_SubstitutionFailure:
982 // Count this failure so that we know that template argument deduction
986 // Make a copy of this suppressed diagnostic and store it with the
987 // template-deduction information.
988 if (*Info && !(*Info)->hasSFINAEDiagnostic()) {
989 Diagnostic DiagInfo(&Diags);
990 (*Info)->addSFINAEDiagnostic(DiagInfo.getLocation(),
991 PartialDiagnostic(DiagInfo, Context.getDiagAllocator()));
994 Diags.setLastDiagnosticIgnored();
998 case DiagnosticIDs::SFINAE_AccessControl: {
999 // Per C++ Core Issue 1170, access control is part of SFINAE.
1000 // Additionally, the AccessCheckingSFINAE flag can be used to temporarily
1001 // make access control a part of SFINAE for the purposes of checking
1003 if (!AccessCheckingSFINAE && !getLangOpts().CPlusPlus11)
1006 SourceLocation Loc = Diags.getCurrentDiagLoc();
1008 // Suppress this diagnostic.
1011 // Make a copy of this suppressed diagnostic and store it with the
1012 // template-deduction information.
1013 if (*Info && !(*Info)->hasSFINAEDiagnostic()) {
1014 Diagnostic DiagInfo(&Diags);
1015 (*Info)->addSFINAEDiagnostic(DiagInfo.getLocation(),
1016 PartialDiagnostic(DiagInfo, Context.getDiagAllocator()));
1019 Diags.setLastDiagnosticIgnored();
1022 // Now the diagnostic state is clear, produce a C++98 compatibility
1024 Diag(Loc, diag::warn_cxx98_compat_sfinae_access_control);
1026 // The last diagnostic which Sema produced was ignored. Suppress any
1027 // notes attached to it.
1028 Diags.setLastDiagnosticIgnored();
1032 case DiagnosticIDs::SFINAE_Suppress:
1033 // Make a copy of this suppressed diagnostic and store it with the
1034 // template-deduction information;
1036 Diagnostic DiagInfo(&Diags);
1037 (*Info)->addSuppressedDiagnostic(DiagInfo.getLocation(),
1038 PartialDiagnostic(DiagInfo, Context.getDiagAllocator()));
1041 // Suppress this diagnostic.
1042 Diags.setLastDiagnosticIgnored();
1048 // Set up the context's printing policy based on our current state.
1049 Context.setPrintingPolicy(getPrintingPolicy());
1051 // Emit the diagnostic.
1052 if (!Diags.EmitCurrentDiagnostic())
1055 // If this is not a note, and we're in a template instantiation
1056 // that is different from the last template instantiation where
1057 // we emitted an error, print a template instantiation
1059 if (!DiagnosticIDs::isBuiltinNote(DiagID) &&
1060 !ActiveTemplateInstantiations.empty() &&
1061 ActiveTemplateInstantiations.back()
1062 != LastTemplateInstantiationErrorContext) {
1063 PrintInstantiationStack();
1064 LastTemplateInstantiationErrorContext = ActiveTemplateInstantiations.back();
1068 Sema::SemaDiagnosticBuilder
1069 Sema::Diag(SourceLocation Loc, const PartialDiagnostic& PD) {
1070 SemaDiagnosticBuilder Builder(Diag(Loc, PD.getDiagID()));
1076 /// \brief Looks through the macro-expansion chain for the given
1077 /// location, looking for a macro expansion with the given name.
1078 /// If one is found, returns true and sets the location to that
1080 bool Sema::findMacroSpelling(SourceLocation &locref, StringRef name) {
1081 SourceLocation loc = locref;
1082 if (!loc.isMacroID()) return false;
1084 // There's no good way right now to look at the intermediate
1085 // expansions, so just jump to the expansion location.
1086 loc = getSourceManager().getExpansionLoc(loc);
1088 // If that's written with the name, stop here.
1089 SmallVector<char, 16> buffer;
1090 if (getPreprocessor().getSpelling(loc, buffer) == name) {
1097 /// \brief Determines the active Scope associated with the given declaration
1100 /// This routine maps a declaration context to the active Scope object that
1101 /// represents that declaration context in the parser. It is typically used
1102 /// from "scope-less" code (e.g., template instantiation, lazy creation of
1103 /// declarations) that injects a name for name-lookup purposes and, therefore,
1104 /// must update the Scope.
1106 /// \returns The scope corresponding to the given declaraion context, or NULL
1107 /// if no such scope is open.
1108 Scope *Sema::getScopeForContext(DeclContext *Ctx) {
1113 Ctx = Ctx->getPrimaryContext();
1114 for (Scope *S = getCurScope(); S; S = S->getParent()) {
1115 // Ignore scopes that cannot have declarations. This is important for
1116 // out-of-line definitions of static class members.
1117 if (S->getFlags() & (Scope::DeclScope | Scope::TemplateParamScope))
1118 if (DeclContext *Entity = S->getEntity())
1119 if (Ctx == Entity->getPrimaryContext())
1126 /// \brief Enter a new function scope
1127 void Sema::PushFunctionScope() {
1128 if (FunctionScopes.size() == 1) {
1129 // Use the "top" function scope rather than having to allocate
1130 // memory for a new scope.
1131 FunctionScopes.back()->Clear();
1132 FunctionScopes.push_back(FunctionScopes.back());
1136 FunctionScopes.push_back(new FunctionScopeInfo(getDiagnostics()));
1139 void Sema::PushBlockScope(Scope *BlockScope, BlockDecl *Block) {
1140 FunctionScopes.push_back(new BlockScopeInfo(getDiagnostics(),
1141 BlockScope, Block));
1144 LambdaScopeInfo *Sema::PushLambdaScope() {
1145 LambdaScopeInfo *const LSI = new LambdaScopeInfo(getDiagnostics());
1146 FunctionScopes.push_back(LSI);
1150 void Sema::RecordParsingTemplateParameterDepth(unsigned Depth) {
1151 if (LambdaScopeInfo *const LSI = getCurLambda()) {
1152 LSI->AutoTemplateParameterDepth = Depth;
1156 "Remove assertion if intentionally called in a non-lambda context.");
1159 void Sema::PopFunctionScopeInfo(const AnalysisBasedWarnings::Policy *WP,
1160 const Decl *D, const BlockExpr *blkExpr) {
1161 FunctionScopeInfo *Scope = FunctionScopes.pop_back_val();
1162 assert(!FunctionScopes.empty() && "mismatched push/pop!");
1164 // Issue any analysis-based warnings.
1166 AnalysisWarnings.IssueWarnings(*WP, Scope, D, blkExpr);
1168 for (const auto &PUD : Scope->PossiblyUnreachableDiags)
1169 Diag(PUD.Loc, PUD.PD);
1171 if (FunctionScopes.back() != Scope)
1175 void Sema::PushCompoundScope() {
1176 getCurFunction()->CompoundScopes.push_back(CompoundScopeInfo());
1179 void Sema::PopCompoundScope() {
1180 FunctionScopeInfo *CurFunction = getCurFunction();
1181 assert(!CurFunction->CompoundScopes.empty() && "mismatched push/pop");
1183 CurFunction->CompoundScopes.pop_back();
1186 /// \brief Determine whether any errors occurred within this function/method/
1188 bool Sema::hasAnyUnrecoverableErrorsInThisFunction() const {
1189 return getCurFunction()->ErrorTrap.hasUnrecoverableErrorOccurred();
1192 BlockScopeInfo *Sema::getCurBlock() {
1193 if (FunctionScopes.empty())
1196 auto CurBSI = dyn_cast<BlockScopeInfo>(FunctionScopes.back());
1197 if (CurBSI && CurBSI->TheDecl &&
1198 !CurBSI->TheDecl->Encloses(CurContext)) {
1199 // We have switched contexts due to template instantiation.
1200 assert(!ActiveTemplateInstantiations.empty());
1207 LambdaScopeInfo *Sema::getCurLambda() {
1208 if (FunctionScopes.empty())
1211 auto CurLSI = dyn_cast<LambdaScopeInfo>(FunctionScopes.back());
1212 if (CurLSI && CurLSI->Lambda &&
1213 !CurLSI->Lambda->Encloses(CurContext)) {
1214 // We have switched contexts due to template instantiation.
1215 assert(!ActiveTemplateInstantiations.empty());
1221 // We have a generic lambda if we parsed auto parameters, or we have
1222 // an associated template parameter list.
1223 LambdaScopeInfo *Sema::getCurGenericLambda() {
1224 if (LambdaScopeInfo *LSI = getCurLambda()) {
1225 return (LSI->AutoTemplateParams.size() ||
1226 LSI->GLTemplateParameterList) ? LSI : nullptr;
1232 void Sema::ActOnComment(SourceRange Comment) {
1233 if (!LangOpts.RetainCommentsFromSystemHeaders &&
1234 SourceMgr.isInSystemHeader(Comment.getBegin()))
1236 RawComment RC(SourceMgr, Comment, false,
1237 LangOpts.CommentOpts.ParseAllComments);
1238 if (RC.isAlmostTrailingComment()) {
1239 SourceRange MagicMarkerRange(Comment.getBegin(),
1240 Comment.getBegin().getLocWithOffset(3));
1241 StringRef MagicMarkerText;
1242 switch (RC.getKind()) {
1243 case RawComment::RCK_OrdinaryBCPL:
1244 MagicMarkerText = "///<";
1246 case RawComment::RCK_OrdinaryC:
1247 MagicMarkerText = "/**<";
1250 llvm_unreachable("if this is an almost Doxygen comment, "
1251 "it should be ordinary");
1253 Diag(Comment.getBegin(), diag::warn_not_a_doxygen_trailing_member_comment) <<
1254 FixItHint::CreateReplacement(MagicMarkerRange, MagicMarkerText);
1256 Context.addComment(RC);
1259 // Pin this vtable to this file.
1260 ExternalSemaSource::~ExternalSemaSource() {}
1262 void ExternalSemaSource::ReadMethodPool(Selector Sel) { }
1264 void ExternalSemaSource::ReadKnownNamespaces(
1265 SmallVectorImpl<NamespaceDecl *> &Namespaces) {
1268 void ExternalSemaSource::ReadUndefinedButUsed(
1269 llvm::DenseMap<NamedDecl *, SourceLocation> &Undefined) {
1272 void ExternalSemaSource::ReadMismatchingDeleteExpressions(llvm::MapVector<
1273 FieldDecl *, llvm::SmallVector<std::pair<SourceLocation, bool>, 4>> &) {}
1275 void PrettyDeclStackTraceEntry::print(raw_ostream &OS) const {
1276 SourceLocation Loc = this->Loc;
1277 if (!Loc.isValid() && TheDecl) Loc = TheDecl->getLocation();
1278 if (Loc.isValid()) {
1279 Loc.print(OS, S.getSourceManager());
1284 if (TheDecl && isa<NamedDecl>(TheDecl)) {
1285 std::string Name = cast<NamedDecl>(TheDecl)->getNameAsString();
1287 OS << " '" << Name << '\'';
1293 /// \brief Figure out if an expression could be turned into a call.
1295 /// Use this when trying to recover from an error where the programmer may have
1296 /// written just the name of a function instead of actually calling it.
1298 /// \param E - The expression to examine.
1299 /// \param ZeroArgCallReturnTy - If the expression can be turned into a call
1300 /// with no arguments, this parameter is set to the type returned by such a
1301 /// call; otherwise, it is set to an empty QualType.
1302 /// \param OverloadSet - If the expression is an overloaded function
1303 /// name, this parameter is populated with the decls of the various overloads.
1304 bool Sema::tryExprAsCall(Expr &E, QualType &ZeroArgCallReturnTy,
1305 UnresolvedSetImpl &OverloadSet) {
1306 ZeroArgCallReturnTy = QualType();
1307 OverloadSet.clear();
1309 const OverloadExpr *Overloads = nullptr;
1310 bool IsMemExpr = false;
1311 if (E.getType() == Context.OverloadTy) {
1312 OverloadExpr::FindResult FR = OverloadExpr::find(const_cast<Expr*>(&E));
1314 // Ignore overloads that are pointer-to-member constants.
1315 if (FR.HasFormOfMemberPointer)
1318 Overloads = FR.Expression;
1319 } else if (E.getType() == Context.BoundMemberTy) {
1320 Overloads = dyn_cast<UnresolvedMemberExpr>(E.IgnoreParens());
1324 bool Ambiguous = false;
1327 for (OverloadExpr::decls_iterator it = Overloads->decls_begin(),
1328 DeclsEnd = Overloads->decls_end(); it != DeclsEnd; ++it) {
1329 OverloadSet.addDecl(*it);
1331 // Check whether the function is a non-template, non-member which takes no
1335 if (const FunctionDecl *OverloadDecl
1336 = dyn_cast<FunctionDecl>((*it)->getUnderlyingDecl())) {
1337 if (OverloadDecl->getMinRequiredArguments() == 0) {
1338 if (!ZeroArgCallReturnTy.isNull() && !Ambiguous) {
1339 ZeroArgCallReturnTy = QualType();
1342 ZeroArgCallReturnTy = OverloadDecl->getReturnType();
1347 // If it's not a member, use better machinery to try to resolve the call
1349 return !ZeroArgCallReturnTy.isNull();
1352 // Attempt to call the member with no arguments - this will correctly handle
1353 // member templates with defaults/deduction of template arguments, overloads
1354 // with default arguments, etc.
1355 if (IsMemExpr && !E.isTypeDependent()) {
1356 bool Suppress = getDiagnostics().getSuppressAllDiagnostics();
1357 getDiagnostics().setSuppressAllDiagnostics(true);
1358 ExprResult R = BuildCallToMemberFunction(nullptr, &E, SourceLocation(),
1359 None, SourceLocation());
1360 getDiagnostics().setSuppressAllDiagnostics(Suppress);
1362 ZeroArgCallReturnTy = R.get()->getType();
1368 if (const DeclRefExpr *DeclRef = dyn_cast<DeclRefExpr>(E.IgnoreParens())) {
1369 if (const FunctionDecl *Fun = dyn_cast<FunctionDecl>(DeclRef->getDecl())) {
1370 if (Fun->getMinRequiredArguments() == 0)
1371 ZeroArgCallReturnTy = Fun->getReturnType();
1376 // We don't have an expression that's convenient to get a FunctionDecl from,
1377 // but we can at least check if the type is "function of 0 arguments".
1378 QualType ExprTy = E.getType();
1379 const FunctionType *FunTy = nullptr;
1380 QualType PointeeTy = ExprTy->getPointeeType();
1381 if (!PointeeTy.isNull())
1382 FunTy = PointeeTy->getAs<FunctionType>();
1384 FunTy = ExprTy->getAs<FunctionType>();
1386 if (const FunctionProtoType *FPT =
1387 dyn_cast_or_null<FunctionProtoType>(FunTy)) {
1388 if (FPT->getNumParams() == 0)
1389 ZeroArgCallReturnTy = FunTy->getReturnType();
1395 /// \brief Give notes for a set of overloads.
1397 /// A companion to tryExprAsCall. In cases when the name that the programmer
1398 /// wrote was an overloaded function, we may be able to make some guesses about
1399 /// plausible overloads based on their return types; such guesses can be handed
1400 /// off to this method to be emitted as notes.
1402 /// \param Overloads - The overloads to note.
1403 /// \param FinalNoteLoc - If we've suppressed printing some overloads due to
1404 /// -fshow-overloads=best, this is the location to attach to the note about too
1405 /// many candidates. Typically this will be the location of the original
1406 /// ill-formed expression.
1407 static void noteOverloads(Sema &S, const UnresolvedSetImpl &Overloads,
1408 const SourceLocation FinalNoteLoc) {
1409 int ShownOverloads = 0;
1410 int SuppressedOverloads = 0;
1411 for (UnresolvedSetImpl::iterator It = Overloads.begin(),
1412 DeclsEnd = Overloads.end(); It != DeclsEnd; ++It) {
1413 // FIXME: Magic number for max shown overloads stolen from
1414 // OverloadCandidateSet::NoteCandidates.
1415 if (ShownOverloads >= 4 && S.Diags.getShowOverloads() == Ovl_Best) {
1416 ++SuppressedOverloads;
1420 NamedDecl *Fn = (*It)->getUnderlyingDecl();
1421 S.Diag(Fn->getLocation(), diag::note_possible_target_of_call);
1425 if (SuppressedOverloads)
1426 S.Diag(FinalNoteLoc, diag::note_ovl_too_many_candidates)
1427 << SuppressedOverloads;
1430 static void notePlausibleOverloads(Sema &S, SourceLocation Loc,
1431 const UnresolvedSetImpl &Overloads,
1432 bool (*IsPlausibleResult)(QualType)) {
1433 if (!IsPlausibleResult)
1434 return noteOverloads(S, Overloads, Loc);
1436 UnresolvedSet<2> PlausibleOverloads;
1437 for (OverloadExpr::decls_iterator It = Overloads.begin(),
1438 DeclsEnd = Overloads.end(); It != DeclsEnd; ++It) {
1439 const FunctionDecl *OverloadDecl = cast<FunctionDecl>(*It);
1440 QualType OverloadResultTy = OverloadDecl->getReturnType();
1441 if (IsPlausibleResult(OverloadResultTy))
1442 PlausibleOverloads.addDecl(It.getDecl());
1444 noteOverloads(S, PlausibleOverloads, Loc);
1447 /// Determine whether the given expression can be called by just
1448 /// putting parentheses after it. Notably, expressions with unary
1449 /// operators can't be because the unary operator will start parsing
1450 /// outside the call.
1451 static bool IsCallableWithAppend(Expr *E) {
1452 E = E->IgnoreImplicit();
1453 return (!isa<CStyleCastExpr>(E) &&
1454 !isa<UnaryOperator>(E) &&
1455 !isa<BinaryOperator>(E) &&
1456 !isa<CXXOperatorCallExpr>(E));
1459 bool Sema::tryToRecoverWithCall(ExprResult &E, const PartialDiagnostic &PD,
1461 bool (*IsPlausibleResult)(QualType)) {
1462 SourceLocation Loc = E.get()->getExprLoc();
1463 SourceRange Range = E.get()->getSourceRange();
1465 QualType ZeroArgCallTy;
1466 UnresolvedSet<4> Overloads;
1467 if (tryExprAsCall(*E.get(), ZeroArgCallTy, Overloads) &&
1468 !ZeroArgCallTy.isNull() &&
1469 (!IsPlausibleResult || IsPlausibleResult(ZeroArgCallTy))) {
1470 // At this point, we know E is potentially callable with 0
1471 // arguments and that it returns something of a reasonable type,
1472 // so we can emit a fixit and carry on pretending that E was
1473 // actually a CallExpr.
1474 SourceLocation ParenInsertionLoc = getLocForEndOfToken(Range.getEnd());
1476 << /*zero-arg*/ 1 << Range
1477 << (IsCallableWithAppend(E.get())
1478 ? FixItHint::CreateInsertion(ParenInsertionLoc, "()")
1480 notePlausibleOverloads(*this, Loc, Overloads, IsPlausibleResult);
1482 // FIXME: Try this before emitting the fixit, and suppress diagnostics
1484 E = ActOnCallExpr(nullptr, E.get(), Range.getEnd(), None,
1485 Range.getEnd().getLocWithOffset(1));
1489 if (!ForceComplain) return false;
1491 Diag(Loc, PD) << /*not zero-arg*/ 0 << Range;
1492 notePlausibleOverloads(*this, Loc, Overloads, IsPlausibleResult);
1497 IdentifierInfo *Sema::getSuperIdentifier() const {
1499 Ident_super = &Context.Idents.get("super");
1503 IdentifierInfo *Sema::getFloat128Identifier() const {
1504 if (!Ident___float128)
1505 Ident___float128 = &Context.Idents.get("__float128");
1506 return Ident___float128;
1509 void Sema::PushCapturedRegionScope(Scope *S, CapturedDecl *CD, RecordDecl *RD,
1510 CapturedRegionKind K) {
1511 CapturingScopeInfo *CSI = new CapturedRegionScopeInfo(
1512 getDiagnostics(), S, CD, RD, CD->getContextParam(), K);
1513 CSI->ReturnType = Context.VoidTy;
1514 FunctionScopes.push_back(CSI);
1517 CapturedRegionScopeInfo *Sema::getCurCapturedRegion() {
1518 if (FunctionScopes.empty())
1521 return dyn_cast<CapturedRegionScopeInfo>(FunctionScopes.back());
1524 const llvm::MapVector<FieldDecl *, Sema::DeleteLocs> &
1525 Sema::getMismatchingDeleteExpressions() const {