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/AST/ASTContext.h"
16 #include "clang/AST/ASTDiagnostic.h"
17 #include "clang/AST/DeclCXX.h"
18 #include "clang/AST/DeclFriend.h"
19 #include "clang/AST/DeclObjC.h"
20 #include "clang/AST/Expr.h"
21 #include "clang/AST/ExprCXX.h"
22 #include "clang/AST/StmtCXX.h"
23 #include "clang/Basic/DiagnosticOptions.h"
24 #include "clang/Basic/PartialDiagnostic.h"
25 #include "clang/Basic/TargetInfo.h"
26 #include "clang/Lex/HeaderSearch.h"
27 #include "clang/Lex/Preprocessor.h"
28 #include "clang/Sema/CXXFieldCollector.h"
29 #include "clang/Sema/DelayedDiagnostic.h"
30 #include "clang/Sema/ExternalSemaSource.h"
31 #include "clang/Sema/Initialization.h"
32 #include "clang/Sema/MultiplexExternalSemaSource.h"
33 #include "clang/Sema/ObjCMethodList.h"
34 #include "clang/Sema/PrettyDeclStackTrace.h"
35 #include "clang/Sema/Scope.h"
36 #include "clang/Sema/ScopeInfo.h"
37 #include "clang/Sema/SemaConsumer.h"
38 #include "clang/Sema/SemaInternal.h"
39 #include "clang/Sema/TemplateDeduction.h"
40 #include "llvm/ADT/DenseMap.h"
41 #include "llvm/ADT/SmallSet.h"
42 using namespace clang;
45 SourceLocation Sema::getLocForEndOfToken(SourceLocation Loc, unsigned Offset) {
46 return Lexer::getLocForEndOfToken(Loc, Offset, SourceMgr, LangOpts);
49 ModuleLoader &Sema::getModuleLoader() const { return PP.getModuleLoader(); }
51 PrintingPolicy Sema::getPrintingPolicy(const ASTContext &Context,
52 const Preprocessor &PP) {
53 PrintingPolicy Policy = Context.getPrintingPolicy();
54 // Our printing policy is copied over the ASTContext printing policy whenever
55 // a diagnostic is emitted, so recompute it.
56 Policy.Bool = Context.getLangOpts().Bool;
58 if (const MacroInfo *BoolMacro = PP.getMacroInfo(Context.getBoolName())) {
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, CodeCompleteConsumer *CodeCompleter)
75 : ExternalSource(nullptr), isMultiplexExternalSource(false),
76 FPFeatures(pp.getLangOpts()), LangOpts(pp.getLangOpts()), PP(pp),
77 Context(ctxt), Consumer(consumer), Diags(PP.getDiagnostics()),
78 SourceMgr(PP.getSourceManager()), CollectStats(false),
79 CodeCompleter(CodeCompleter), CurContext(nullptr),
80 OriginalLexicalContext(nullptr), MSStructPragmaOn(false),
81 MSPointerToMemberRepresentationMethod(
82 LangOpts.getMSPointerToMemberRepresentationMethod()),
83 VtorDispStack(MSVtorDispAttr::Mode(LangOpts.VtorDispMode)), PackStack(0),
84 DataSegStack(nullptr), BSSSegStack(nullptr), ConstSegStack(nullptr),
85 CodeSegStack(nullptr), CurInitSeg(nullptr), VisContext(nullptr),
86 PragmaAttributeCurrentTargetDecl(nullptr),
87 IsBuildingRecoveryCallExpr(false), Cleanup{}, LateTemplateParser(nullptr),
88 LateTemplateParserCleanup(nullptr), OpaqueParser(nullptr), IdResolver(pp),
89 StdExperimentalNamespaceCache(nullptr), StdInitializerList(nullptr),
90 CXXTypeInfoDecl(nullptr), MSVCGuidDecl(nullptr), NSNumberDecl(nullptr),
91 NSValueDecl(nullptr), NSStringDecl(nullptr),
92 StringWithUTF8StringMethod(nullptr),
93 ValueWithBytesObjCTypeMethod(nullptr), NSArrayDecl(nullptr),
94 ArrayWithObjectsMethod(nullptr), NSDictionaryDecl(nullptr),
95 DictionaryWithObjectsMethod(nullptr), GlobalNewDeleteDeclared(false),
96 TUKind(TUKind), NumSFINAEErrors(0), AccessCheckingSFINAE(false),
97 InNonInstantiationSFINAEContext(false), NonInstantiationEntries(0),
98 ArgumentPackSubstitutionIndex(-1), CurrentInstantiationScope(nullptr),
99 DisableTypoCorrection(false), TyposCorrected(0), AnalysisWarnings(*this),
100 ThreadSafetyDeclCache(nullptr), VarDataSharingAttributesStack(nullptr),
101 CurScope(nullptr), Ident_super(nullptr), Ident___float128(nullptr) {
104 LoadedExternalKnownNamespaces = false;
105 for (unsigned I = 0; I != NSAPI::NumNSNumberLiteralMethods; ++I)
106 NSNumberLiteralMethods[I] = nullptr;
108 if (getLangOpts().ObjC1)
109 NSAPIObj.reset(new NSAPI(Context));
111 if (getLangOpts().CPlusPlus)
112 FieldCollector.reset(new CXXFieldCollector());
114 // Tell diagnostics how to render things from the AST library.
115 Diags.SetArgToStringFn(&FormatASTNodeDiagnosticArgument, &Context);
117 ExprEvalContexts.emplace_back(
118 ExpressionEvaluationContext::PotentiallyEvaluated, 0, CleanupInfo{},
121 FunctionScopes.push_back(new FunctionScopeInfo(Diags));
123 // Initilization of data sharing attributes stack for OpenMP
124 InitDataSharingAttributesStack();
127 void Sema::addImplicitTypedef(StringRef Name, QualType T) {
128 DeclarationName DN = &Context.Idents.get(Name);
129 if (IdResolver.begin(DN) == IdResolver.end())
130 PushOnScopeChains(Context.buildImplicitTypedef(T, Name), TUScope);
133 void Sema::Initialize() {
134 if (SemaConsumer *SC = dyn_cast<SemaConsumer>(&Consumer))
135 SC->InitializeSema(*this);
137 // Tell the external Sema source about this Sema object.
138 if (ExternalSemaSource *ExternalSema
139 = dyn_cast_or_null<ExternalSemaSource>(Context.getExternalSource()))
140 ExternalSema->InitializeSema(*this);
142 // This needs to happen after ExternalSemaSource::InitializeSema(this) or we
143 // will not be able to merge any duplicate __va_list_tag decls correctly.
144 VAListTagName = PP.getIdentifierInfo("__va_list_tag");
149 // Initialize predefined 128-bit integer types, if needed.
150 if (Context.getTargetInfo().hasInt128Type()) {
151 // If either of the 128-bit integer types are unavailable to name lookup,
153 DeclarationName Int128 = &Context.Idents.get("__int128_t");
154 if (IdResolver.begin(Int128) == IdResolver.end())
155 PushOnScopeChains(Context.getInt128Decl(), TUScope);
157 DeclarationName UInt128 = &Context.Idents.get("__uint128_t");
158 if (IdResolver.begin(UInt128) == IdResolver.end())
159 PushOnScopeChains(Context.getUInt128Decl(), TUScope);
163 // Initialize predefined Objective-C types:
164 if (getLangOpts().ObjC1) {
165 // If 'SEL' does not yet refer to any declarations, make it refer to the
167 DeclarationName SEL = &Context.Idents.get("SEL");
168 if (IdResolver.begin(SEL) == IdResolver.end())
169 PushOnScopeChains(Context.getObjCSelDecl(), TUScope);
171 // If 'id' does not yet refer to any declarations, make it refer to the
173 DeclarationName Id = &Context.Idents.get("id");
174 if (IdResolver.begin(Id) == IdResolver.end())
175 PushOnScopeChains(Context.getObjCIdDecl(), TUScope);
177 // Create the built-in typedef for 'Class'.
178 DeclarationName Class = &Context.Idents.get("Class");
179 if (IdResolver.begin(Class) == IdResolver.end())
180 PushOnScopeChains(Context.getObjCClassDecl(), TUScope);
182 // Create the built-in forward declaratino for 'Protocol'.
183 DeclarationName Protocol = &Context.Idents.get("Protocol");
184 if (IdResolver.begin(Protocol) == IdResolver.end())
185 PushOnScopeChains(Context.getObjCProtocolDecl(), TUScope);
188 // Create the internal type for the *StringMakeConstantString builtins.
189 DeclarationName ConstantString = &Context.Idents.get("__NSConstantString");
190 if (IdResolver.begin(ConstantString) == IdResolver.end())
191 PushOnScopeChains(Context.getCFConstantStringDecl(), TUScope);
193 // Initialize Microsoft "predefined C++ types".
194 if (getLangOpts().MSVCCompat) {
195 if (getLangOpts().CPlusPlus &&
196 IdResolver.begin(&Context.Idents.get("type_info")) == IdResolver.end())
197 PushOnScopeChains(Context.buildImplicitRecord("type_info", TTK_Class),
200 addImplicitTypedef("size_t", Context.getSizeType());
203 // Initialize predefined OpenCL types and supported extensions and (optional)
205 if (getLangOpts().OpenCL) {
206 getOpenCLOptions().addSupport(Context.getTargetInfo().getSupportedOpenCLOpts());
207 getOpenCLOptions().enableSupportedCore(getLangOpts().OpenCLVersion);
208 addImplicitTypedef("sampler_t", Context.OCLSamplerTy);
209 addImplicitTypedef("event_t", Context.OCLEventTy);
210 if (getLangOpts().OpenCLVersion >= 200) {
211 addImplicitTypedef("clk_event_t", Context.OCLClkEventTy);
212 addImplicitTypedef("queue_t", Context.OCLQueueTy);
213 addImplicitTypedef("reserve_id_t", Context.OCLReserveIDTy);
214 addImplicitTypedef("atomic_int", Context.getAtomicType(Context.IntTy));
215 addImplicitTypedef("atomic_uint",
216 Context.getAtomicType(Context.UnsignedIntTy));
217 auto AtomicLongT = Context.getAtomicType(Context.LongTy);
218 addImplicitTypedef("atomic_long", AtomicLongT);
219 auto AtomicULongT = Context.getAtomicType(Context.UnsignedLongTy);
220 addImplicitTypedef("atomic_ulong", AtomicULongT);
221 addImplicitTypedef("atomic_float",
222 Context.getAtomicType(Context.FloatTy));
223 auto AtomicDoubleT = Context.getAtomicType(Context.DoubleTy);
224 addImplicitTypedef("atomic_double", AtomicDoubleT);
225 // OpenCLC v2.0, s6.13.11.6 requires that atomic_flag is implemented as
226 // 32-bit integer and OpenCLC v2.0, s6.1.1 int is always 32-bit wide.
227 addImplicitTypedef("atomic_flag", Context.getAtomicType(Context.IntTy));
228 auto AtomicIntPtrT = Context.getAtomicType(Context.getIntPtrType());
229 addImplicitTypedef("atomic_intptr_t", AtomicIntPtrT);
230 auto AtomicUIntPtrT = Context.getAtomicType(Context.getUIntPtrType());
231 addImplicitTypedef("atomic_uintptr_t", AtomicUIntPtrT);
232 auto AtomicSizeT = Context.getAtomicType(Context.getSizeType());
233 addImplicitTypedef("atomic_size_t", AtomicSizeT);
234 auto AtomicPtrDiffT = Context.getAtomicType(Context.getPointerDiffType());
235 addImplicitTypedef("atomic_ptrdiff_t", AtomicPtrDiffT);
237 // OpenCL v2.0 s6.13.11.6:
238 // - The atomic_long and atomic_ulong types are supported if the
239 // cl_khr_int64_base_atomics and cl_khr_int64_extended_atomics
240 // extensions are supported.
241 // - The atomic_double type is only supported if double precision
242 // is supported and the cl_khr_int64_base_atomics and
243 // cl_khr_int64_extended_atomics extensions are supported.
244 // - If the device address space is 64-bits, the data types
245 // atomic_intptr_t, atomic_uintptr_t, atomic_size_t and
246 // atomic_ptrdiff_t are supported if the cl_khr_int64_base_atomics and
247 // cl_khr_int64_extended_atomics extensions are supported.
248 std::vector<QualType> Atomic64BitTypes;
249 Atomic64BitTypes.push_back(AtomicLongT);
250 Atomic64BitTypes.push_back(AtomicULongT);
251 Atomic64BitTypes.push_back(AtomicDoubleT);
252 if (Context.getTypeSize(AtomicSizeT) == 64) {
253 Atomic64BitTypes.push_back(AtomicSizeT);
254 Atomic64BitTypes.push_back(AtomicIntPtrT);
255 Atomic64BitTypes.push_back(AtomicUIntPtrT);
256 Atomic64BitTypes.push_back(AtomicPtrDiffT);
258 for (auto &I : Atomic64BitTypes)
259 setOpenCLExtensionForType(I,
260 "cl_khr_int64_base_atomics cl_khr_int64_extended_atomics");
262 setOpenCLExtensionForType(AtomicDoubleT, "cl_khr_fp64");
265 setOpenCLExtensionForType(Context.DoubleTy, "cl_khr_fp64");
267 #define GENERIC_IMAGE_TYPE_EXT(Type, Id, Ext) \
268 setOpenCLExtensionForType(Context.Id, Ext);
269 #include "clang/Basic/OpenCLImageTypes.def"
272 if (Context.getTargetInfo().hasBuiltinMSVaList()) {
273 DeclarationName MSVaList = &Context.Idents.get("__builtin_ms_va_list");
274 if (IdResolver.begin(MSVaList) == IdResolver.end())
275 PushOnScopeChains(Context.getBuiltinMSVaListDecl(), TUScope);
278 DeclarationName BuiltinVaList = &Context.Idents.get("__builtin_va_list");
279 if (IdResolver.begin(BuiltinVaList) == IdResolver.end())
280 PushOnScopeChains(Context.getBuiltinVaListDecl(), TUScope);
284 if (VisContext) FreeVisContext();
285 // Kill all the active scopes.
286 for (unsigned I = 1, E = FunctionScopes.size(); I != E; ++I)
287 delete FunctionScopes[I];
288 if (FunctionScopes.size() == 1)
289 delete FunctionScopes[0];
291 // Tell the SemaConsumer to forget about us; we're going out of scope.
292 if (SemaConsumer *SC = dyn_cast<SemaConsumer>(&Consumer))
295 // Detach from the external Sema source.
296 if (ExternalSemaSource *ExternalSema
297 = dyn_cast_or_null<ExternalSemaSource>(Context.getExternalSource()))
298 ExternalSema->ForgetSema();
300 // If Sema's ExternalSource is the multiplexer - we own it.
301 if (isMultiplexExternalSource)
302 delete ExternalSource;
304 threadSafety::threadSafetyCleanup(ThreadSafetyDeclCache);
306 // Destroys data sharing attributes stack for OpenMP
307 DestroyDataSharingAttributesStack();
309 assert(DelayedTypos.empty() && "Uncorrected typos!");
312 /// makeUnavailableInSystemHeader - There is an error in the current
313 /// context. If we're still in a system header, and we can plausibly
314 /// make the relevant declaration unavailable instead of erroring, do
315 /// so and return true.
316 bool Sema::makeUnavailableInSystemHeader(SourceLocation loc,
317 UnavailableAttr::ImplicitReason reason) {
318 // If we're not in a function, it's an error.
319 FunctionDecl *fn = dyn_cast<FunctionDecl>(CurContext);
320 if (!fn) return false;
322 // If we're in template instantiation, it's an error.
323 if (inTemplateInstantiation())
326 // If that function's not in a system header, it's an error.
327 if (!Context.getSourceManager().isInSystemHeader(loc))
330 // If the function is already unavailable, it's not an error.
331 if (fn->hasAttr<UnavailableAttr>()) return true;
333 fn->addAttr(UnavailableAttr::CreateImplicit(Context, "", reason, loc));
337 ASTMutationListener *Sema::getASTMutationListener() const {
338 return getASTConsumer().GetASTMutationListener();
341 ///\brief Registers an external source. If an external source already exists,
342 /// creates a multiplex external source and appends to it.
344 ///\param[in] E - A non-null external sema source.
346 void Sema::addExternalSource(ExternalSemaSource *E) {
347 assert(E && "Cannot use with NULL ptr");
349 if (!ExternalSource) {
354 if (isMultiplexExternalSource)
355 static_cast<MultiplexExternalSemaSource*>(ExternalSource)->addSource(*E);
357 ExternalSource = new MultiplexExternalSemaSource(*ExternalSource, *E);
358 isMultiplexExternalSource = true;
362 /// \brief Print out statistics about the semantic analysis.
363 void Sema::PrintStats() const {
364 llvm::errs() << "\n*** Semantic Analysis Stats:\n";
365 llvm::errs() << NumSFINAEErrors << " SFINAE diagnostics trapped.\n";
367 BumpAlloc.PrintStats();
368 AnalysisWarnings.PrintStats();
371 void Sema::diagnoseNullableToNonnullConversion(QualType DstType,
373 SourceLocation Loc) {
374 Optional<NullabilityKind> ExprNullability = SrcType->getNullability(Context);
375 if (!ExprNullability || *ExprNullability != NullabilityKind::Nullable)
378 Optional<NullabilityKind> TypeNullability = DstType->getNullability(Context);
379 if (!TypeNullability || *TypeNullability != NullabilityKind::NonNull)
382 Diag(Loc, diag::warn_nullability_lost) << SrcType << DstType;
385 void Sema::diagnoseZeroToNullptrConversion(CastKind Kind, const Expr* E) {
386 if (Kind != CK_NullToPointer && Kind != CK_NullToMemberPointer)
388 if (E->getType()->isNullPtrType())
390 // nullptr only exists from C++11 on, so don't warn on its absence earlier.
391 if (!getLangOpts().CPlusPlus11)
394 Diag(E->getLocStart(), diag::warn_zero_as_null_pointer_constant)
395 << FixItHint::CreateReplacement(E->getSourceRange(), "nullptr");
398 /// ImpCastExprToType - If Expr is not of type 'Type', insert an implicit cast.
399 /// If there is already an implicit cast, merge into the existing one.
400 /// The result is of the given category.
401 ExprResult Sema::ImpCastExprToType(Expr *E, QualType Ty,
402 CastKind Kind, ExprValueKind VK,
403 const CXXCastPath *BasePath,
404 CheckedConversionKind CCK) {
406 if (VK == VK_RValue && !E->isRValue()) {
409 llvm_unreachable("can't implicitly cast lvalue to rvalue with this cast "
411 case CK_LValueToRValue:
412 case CK_ArrayToPointerDecay:
413 case CK_FunctionToPointerDecay:
418 assert((VK == VK_RValue || !E->isRValue()) && "can't cast rvalue to lvalue");
421 diagnoseNullableToNonnullConversion(Ty, E->getType(), E->getLocStart());
422 diagnoseZeroToNullptrConversion(Kind, E);
424 QualType ExprTy = Context.getCanonicalType(E->getType());
425 QualType TypeTy = Context.getCanonicalType(Ty);
427 if (ExprTy == TypeTy)
430 // C++1z [conv.array]: The temporary materialization conversion is applied.
431 // We also use this to fuel C++ DR1213, which applies to C++11 onwards.
432 if (Kind == CK_ArrayToPointerDecay && getLangOpts().CPlusPlus &&
433 E->getValueKind() == VK_RValue) {
434 // The temporary is an lvalue in C++98 and an xvalue otherwise.
435 ExprResult Materialized = CreateMaterializeTemporaryExpr(
436 E->getType(), E, !getLangOpts().CPlusPlus11);
437 if (Materialized.isInvalid())
439 E = Materialized.get();
442 if (ImplicitCastExpr *ImpCast = dyn_cast<ImplicitCastExpr>(E)) {
443 if (ImpCast->getCastKind() == Kind && (!BasePath || BasePath->empty())) {
444 ImpCast->setType(Ty);
445 ImpCast->setValueKind(VK);
450 return ImplicitCastExpr::Create(Context, Ty, Kind, E, BasePath, VK);
453 /// ScalarTypeToBooleanCastKind - Returns the cast kind corresponding
454 /// to the conversion from scalar type ScalarTy to the Boolean type.
455 CastKind Sema::ScalarTypeToBooleanCastKind(QualType ScalarTy) {
456 switch (ScalarTy->getScalarTypeKind()) {
457 case Type::STK_Bool: return CK_NoOp;
458 case Type::STK_CPointer: return CK_PointerToBoolean;
459 case Type::STK_BlockPointer: return CK_PointerToBoolean;
460 case Type::STK_ObjCObjectPointer: return CK_PointerToBoolean;
461 case Type::STK_MemberPointer: return CK_MemberPointerToBoolean;
462 case Type::STK_Integral: return CK_IntegralToBoolean;
463 case Type::STK_Floating: return CK_FloatingToBoolean;
464 case Type::STK_IntegralComplex: return CK_IntegralComplexToBoolean;
465 case Type::STK_FloatingComplex: return CK_FloatingComplexToBoolean;
470 /// \brief Used to prune the decls of Sema's UnusedFileScopedDecls vector.
471 static bool ShouldRemoveFromUnused(Sema *SemaRef, const DeclaratorDecl *D) {
472 if (D->getMostRecentDecl()->isUsed())
475 if (D->isExternallyVisible())
478 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
479 // If this is a function template and none of its specializations is used,
481 if (FunctionTemplateDecl *Template = FD->getDescribedFunctionTemplate())
482 for (const auto *Spec : Template->specializations())
483 if (ShouldRemoveFromUnused(SemaRef, Spec))
486 // UnusedFileScopedDecls stores the first declaration.
487 // The declaration may have become definition so check again.
488 const FunctionDecl *DeclToCheck;
489 if (FD->hasBody(DeclToCheck))
490 return !SemaRef->ShouldWarnIfUnusedFileScopedDecl(DeclToCheck);
492 // Later redecls may add new information resulting in not having to warn,
494 DeclToCheck = FD->getMostRecentDecl();
495 if (DeclToCheck != FD)
496 return !SemaRef->ShouldWarnIfUnusedFileScopedDecl(DeclToCheck);
499 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) {
500 // If a variable usable in constant expressions is referenced,
501 // don't warn if it isn't used: if the value of a variable is required
502 // for the computation of a constant expression, it doesn't make sense to
503 // warn even if the variable isn't odr-used. (isReferenced doesn't
504 // precisely reflect that, but it's a decent approximation.)
505 if (VD->isReferenced() &&
506 VD->isUsableInConstantExpressions(SemaRef->Context))
509 if (VarTemplateDecl *Template = VD->getDescribedVarTemplate())
510 // If this is a variable template and none of its specializations is used,
512 for (const auto *Spec : Template->specializations())
513 if (ShouldRemoveFromUnused(SemaRef, Spec))
516 // UnusedFileScopedDecls stores the first declaration.
517 // The declaration may have become definition so check again.
518 const VarDecl *DeclToCheck = VD->getDefinition();
520 return !SemaRef->ShouldWarnIfUnusedFileScopedDecl(DeclToCheck);
522 // Later redecls may add new information resulting in not having to warn,
524 DeclToCheck = VD->getMostRecentDecl();
525 if (DeclToCheck != VD)
526 return !SemaRef->ShouldWarnIfUnusedFileScopedDecl(DeclToCheck);
532 /// Obtains a sorted list of functions and variables that are undefined but
534 void Sema::getUndefinedButUsed(
535 SmallVectorImpl<std::pair<NamedDecl *, SourceLocation> > &Undefined) {
536 for (const auto &UndefinedUse : UndefinedButUsed) {
537 NamedDecl *ND = UndefinedUse.first;
539 // Ignore attributes that have become invalid.
540 if (ND->isInvalidDecl()) continue;
542 // __attribute__((weakref)) is basically a definition.
543 if (ND->hasAttr<WeakRefAttr>()) continue;
545 if (FunctionDecl *FD = dyn_cast<FunctionDecl>(ND)) {
548 if (FD->isExternallyVisible() &&
549 !FD->getMostRecentDecl()->isInlined())
552 auto *VD = cast<VarDecl>(ND);
553 if (VD->hasDefinition() != VarDecl::DeclarationOnly)
555 if (VD->isExternallyVisible() && !VD->getMostRecentDecl()->isInline())
559 Undefined.push_back(std::make_pair(ND, UndefinedUse.second));
563 /// checkUndefinedButUsed - Check for undefined objects with internal linkage
564 /// or that are inline.
565 static void checkUndefinedButUsed(Sema &S) {
566 if (S.UndefinedButUsed.empty()) return;
568 // Collect all the still-undefined entities with internal linkage.
569 SmallVector<std::pair<NamedDecl *, SourceLocation>, 16> Undefined;
570 S.getUndefinedButUsed(Undefined);
571 if (Undefined.empty()) return;
573 for (SmallVectorImpl<std::pair<NamedDecl *, SourceLocation> >::iterator
574 I = Undefined.begin(), E = Undefined.end(); I != E; ++I) {
575 NamedDecl *ND = I->first;
577 if (ND->hasAttr<DLLImportAttr>() || ND->hasAttr<DLLExportAttr>()) {
578 // An exported function will always be emitted when defined, so even if
579 // the function is inline, it doesn't have to be emitted in this TU. An
580 // imported function implies that it has been exported somewhere else.
584 if (!ND->isExternallyVisible()) {
585 S.Diag(ND->getLocation(), diag::warn_undefined_internal)
586 << isa<VarDecl>(ND) << ND;
587 } else if (auto *FD = dyn_cast<FunctionDecl>(ND)) {
589 assert(FD->getMostRecentDecl()->isInlined() &&
590 "used object requires definition but isn't inline or internal?");
591 // FIXME: This is ill-formed; we should reject.
592 S.Diag(ND->getLocation(), diag::warn_undefined_inline) << ND;
594 assert(cast<VarDecl>(ND)->getMostRecentDecl()->isInline() &&
595 "used var requires definition but isn't inline or internal?");
596 S.Diag(ND->getLocation(), diag::err_undefined_inline_var) << ND;
598 if (I->second.isValid())
599 S.Diag(I->second, diag::note_used_here);
602 S.UndefinedButUsed.clear();
605 void Sema::LoadExternalWeakUndeclaredIdentifiers() {
609 SmallVector<std::pair<IdentifierInfo *, WeakInfo>, 4> WeakIDs;
610 ExternalSource->ReadWeakUndeclaredIdentifiers(WeakIDs);
611 for (auto &WeakID : WeakIDs)
612 WeakUndeclaredIdentifiers.insert(WeakID);
616 typedef llvm::DenseMap<const CXXRecordDecl*, bool> RecordCompleteMap;
618 /// \brief Returns true, if all methods and nested classes of the given
619 /// CXXRecordDecl are defined in this translation unit.
621 /// Should only be called from ActOnEndOfTranslationUnit so that all
622 /// definitions are actually read.
623 static bool MethodsAndNestedClassesComplete(const CXXRecordDecl *RD,
624 RecordCompleteMap &MNCComplete) {
625 RecordCompleteMap::iterator Cache = MNCComplete.find(RD);
626 if (Cache != MNCComplete.end())
627 return Cache->second;
628 if (!RD->isCompleteDefinition())
630 bool Complete = true;
631 for (DeclContext::decl_iterator I = RD->decls_begin(),
633 I != E && Complete; ++I) {
634 if (const CXXMethodDecl *M = dyn_cast<CXXMethodDecl>(*I))
635 Complete = M->isDefined() || (M->isPure() && !isa<CXXDestructorDecl>(M));
636 else if (const FunctionTemplateDecl *F = dyn_cast<FunctionTemplateDecl>(*I))
637 // If the template function is marked as late template parsed at this
638 // point, it has not been instantiated and therefore we have not
639 // performed semantic analysis on it yet, so we cannot know if the type
640 // can be considered complete.
641 Complete = !F->getTemplatedDecl()->isLateTemplateParsed() &&
642 F->getTemplatedDecl()->isDefined();
643 else if (const CXXRecordDecl *R = dyn_cast<CXXRecordDecl>(*I)) {
644 if (R->isInjectedClassName())
646 if (R->hasDefinition())
647 Complete = MethodsAndNestedClassesComplete(R->getDefinition(),
653 MNCComplete[RD] = Complete;
657 /// \brief Returns true, if the given CXXRecordDecl is fully defined in this
658 /// translation unit, i.e. all methods are defined or pure virtual and all
659 /// friends, friend functions and nested classes are fully defined in this
660 /// translation unit.
662 /// Should only be called from ActOnEndOfTranslationUnit so that all
663 /// definitions are actually read.
664 static bool IsRecordFullyDefined(const CXXRecordDecl *RD,
665 RecordCompleteMap &RecordsComplete,
666 RecordCompleteMap &MNCComplete) {
667 RecordCompleteMap::iterator Cache = RecordsComplete.find(RD);
668 if (Cache != RecordsComplete.end())
669 return Cache->second;
670 bool Complete = MethodsAndNestedClassesComplete(RD, MNCComplete);
671 for (CXXRecordDecl::friend_iterator I = RD->friend_begin(),
672 E = RD->friend_end();
673 I != E && Complete; ++I) {
674 // Check if friend classes and methods are complete.
675 if (TypeSourceInfo *TSI = (*I)->getFriendType()) {
676 // Friend classes are available as the TypeSourceInfo of the FriendDecl.
677 if (CXXRecordDecl *FriendD = TSI->getType()->getAsCXXRecordDecl())
678 Complete = MethodsAndNestedClassesComplete(FriendD, MNCComplete);
682 // Friend functions are available through the NamedDecl of FriendDecl.
683 if (const FunctionDecl *FD =
684 dyn_cast<FunctionDecl>((*I)->getFriendDecl()))
685 Complete = FD->isDefined();
687 // This is a template friend, give up.
691 RecordsComplete[RD] = Complete;
695 void Sema::emitAndClearUnusedLocalTypedefWarnings() {
697 ExternalSource->ReadUnusedLocalTypedefNameCandidates(
698 UnusedLocalTypedefNameCandidates);
699 for (const TypedefNameDecl *TD : UnusedLocalTypedefNameCandidates) {
700 if (TD->isReferenced())
702 Diag(TD->getLocation(), diag::warn_unused_local_typedef)
703 << isa<TypeAliasDecl>(TD) << TD->getDeclName();
705 UnusedLocalTypedefNameCandidates.clear();
708 /// This is called before the very first declaration in the translation unit
709 /// is parsed. Note that the ASTContext may have already injected some
711 void Sema::ActOnStartOfTranslationUnit() {
712 if (getLangOpts().ModulesTS) {
713 // We start in the global module; all those declarations are implicitly
714 // module-private (though they do not have module linkage).
715 Context.getTranslationUnitDecl()->setModuleOwnershipKind(
716 Decl::ModuleOwnershipKind::ModulePrivate);
720 /// ActOnEndOfTranslationUnit - This is called at the very end of the
721 /// translation unit when EOF is reached and all but the top-level scope is
723 void Sema::ActOnEndOfTranslationUnit() {
724 assert(DelayedDiagnostics.getCurrentPool() == nullptr
725 && "reached end of translation unit with a pool attached?");
727 // If code completion is enabled, don't perform any end-of-translation-unit
729 if (PP.isCodeCompletionEnabled())
732 // Complete translation units and modules define vtables and perform implicit
733 // instantiations. PCH files do not.
734 if (TUKind != TU_Prefix) {
735 DiagnoseUseOfUnimplementedSelectors();
737 // If DefinedUsedVTables ends up marking any virtual member functions it
738 // might lead to more pending template instantiations, which we then need
742 // C++: Perform implicit template instantiations.
744 // FIXME: When we perform these implicit instantiations, we do not
745 // carefully keep track of the point of instantiation (C++ [temp.point]).
746 // This means that name lookup that occurs within the template
747 // instantiation will always happen at the end of the translation unit,
748 // so it will find some names that are not required to be found. This is
749 // valid, but we could do better by diagnosing if an instantiation uses a
750 // name that was not visible at its first point of instantiation.
751 if (ExternalSource) {
752 // Load pending instantiations from the external source.
753 SmallVector<PendingImplicitInstantiation, 4> Pending;
754 ExternalSource->ReadPendingInstantiations(Pending);
755 for (auto PII : Pending)
756 if (auto Func = dyn_cast<FunctionDecl>(PII.first))
757 Func->setInstantiationIsPending(true);
758 PendingInstantiations.insert(PendingInstantiations.begin(),
759 Pending.begin(), Pending.end());
761 PerformPendingInstantiations();
763 if (LateTemplateParserCleanup)
764 LateTemplateParserCleanup(OpaqueParser);
766 CheckDelayedMemberExceptionSpecs();
769 DiagnoseUnterminatedPragmaAttribute();
771 // All delayed member exception specs should be checked or we end up accepting
772 // incompatible declarations.
773 // FIXME: This is wrong for TUKind == TU_Prefix. In that case, we need to
774 // write out the lists to the AST file (if any).
775 assert(DelayedDefaultedMemberExceptionSpecs.empty());
776 assert(DelayedExceptionSpecChecks.empty());
778 // All dllexport classes should have been processed already.
779 assert(DelayedDllExportClasses.empty());
781 // Remove file scoped decls that turned out to be used.
782 UnusedFileScopedDecls.erase(
783 std::remove_if(UnusedFileScopedDecls.begin(nullptr, true),
784 UnusedFileScopedDecls.end(),
785 [this](const DeclaratorDecl *DD) {
786 return ShouldRemoveFromUnused(this, DD);
788 UnusedFileScopedDecls.end());
790 if (TUKind == TU_Prefix) {
791 // Translation unit prefixes don't need any of the checking below.
792 if (!PP.isIncrementalProcessingEnabled())
797 // Check for #pragma weak identifiers that were never declared
798 LoadExternalWeakUndeclaredIdentifiers();
799 for (auto WeakID : WeakUndeclaredIdentifiers) {
800 if (WeakID.second.getUsed())
803 Decl *PrevDecl = LookupSingleName(TUScope, WeakID.first, SourceLocation(),
805 if (PrevDecl != nullptr &&
806 !(isa<FunctionDecl>(PrevDecl) || isa<VarDecl>(PrevDecl)))
807 Diag(WeakID.second.getLocation(), diag::warn_attribute_wrong_decl_type)
808 << "'weak'" << ExpectedVariableOrFunction;
810 Diag(WeakID.second.getLocation(), diag::warn_weak_identifier_undeclared)
814 if (LangOpts.CPlusPlus11 &&
815 !Diags.isIgnored(diag::warn_delegating_ctor_cycle, SourceLocation()))
816 CheckDelegatingCtorCycles();
818 if (!Diags.hasErrorOccurred()) {
820 ExternalSource->ReadUndefinedButUsed(UndefinedButUsed);
821 checkUndefinedButUsed(*this);
824 if (TUKind == TU_Module) {
825 // If we are building a module, resolve all of the exported declarations
827 if (Module *CurrentModule = PP.getCurrentModule()) {
828 ModuleMap &ModMap = PP.getHeaderSearchInfo().getModuleMap();
830 SmallVector<Module *, 2> Stack;
831 Stack.push_back(CurrentModule);
832 while (!Stack.empty()) {
833 Module *Mod = Stack.pop_back_val();
835 // Resolve the exported declarations and conflicts.
836 // FIXME: Actually complain, once we figure out how to teach the
837 // diagnostic client to deal with complaints in the module map at this
839 ModMap.resolveExports(Mod, /*Complain=*/false);
840 ModMap.resolveUses(Mod, /*Complain=*/false);
841 ModMap.resolveConflicts(Mod, /*Complain=*/false);
843 // Queue the submodules, so their exports will also be resolved.
844 Stack.append(Mod->submodule_begin(), Mod->submodule_end());
848 // Warnings emitted in ActOnEndOfTranslationUnit() should be emitted for
849 // modules when they are built, not every time they are used.
850 emitAndClearUnusedLocalTypedefWarnings();
852 // Modules don't need any of the checking below.
858 // A declaration of an identifier for an object that has file
859 // scope without an initializer, and without a storage-class
860 // specifier or with the storage-class specifier static,
861 // constitutes a tentative definition. If a translation unit
862 // contains one or more tentative definitions for an identifier,
863 // and the translation unit contains no external definition for
864 // that identifier, then the behavior is exactly as if the
865 // translation unit contains a file scope declaration of that
866 // identifier, with the composite type as of the end of the
867 // translation unit, with an initializer equal to 0.
868 llvm::SmallSet<VarDecl *, 32> Seen;
869 for (TentativeDefinitionsType::iterator
870 T = TentativeDefinitions.begin(ExternalSource),
871 TEnd = TentativeDefinitions.end();
874 VarDecl *VD = (*T)->getActingDefinition();
876 // If the tentative definition was completed, getActingDefinition() returns
877 // null. If we've already seen this variable before, insert()'s second
878 // return value is false.
879 if (!VD || VD->isInvalidDecl() || !Seen.insert(VD).second)
882 if (const IncompleteArrayType *ArrayT
883 = Context.getAsIncompleteArrayType(VD->getType())) {
884 // Set the length of the array to 1 (C99 6.9.2p5).
885 Diag(VD->getLocation(), diag::warn_tentative_incomplete_array);
886 llvm::APInt One(Context.getTypeSize(Context.getSizeType()), true);
887 QualType T = Context.getConstantArrayType(ArrayT->getElementType(),
888 One, ArrayType::Normal, 0);
890 } else if (RequireCompleteType(VD->getLocation(), VD->getType(),
891 diag::err_tentative_def_incomplete_type))
892 VD->setInvalidDecl();
894 // No initialization is performed for a tentative definition.
895 CheckCompleteVariableDeclaration(VD);
897 // Notify the consumer that we've completed a tentative definition.
898 if (!VD->isInvalidDecl())
899 Consumer.CompleteTentativeDefinition(VD);
903 // If there were errors, disable 'unused' warnings since they will mostly be
905 if (!Diags.hasErrorOccurred()) {
906 // Output warning for unused file scoped decls.
907 for (UnusedFileScopedDeclsType::iterator
908 I = UnusedFileScopedDecls.begin(ExternalSource),
909 E = UnusedFileScopedDecls.end(); I != E; ++I) {
910 if (ShouldRemoveFromUnused(this, *I))
913 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(*I)) {
914 const FunctionDecl *DiagD;
915 if (!FD->hasBody(DiagD))
917 if (DiagD->isDeleted())
918 continue; // Deleted functions are supposed to be unused.
919 if (DiagD->isReferenced()) {
920 if (isa<CXXMethodDecl>(DiagD))
921 Diag(DiagD->getLocation(), diag::warn_unneeded_member_function)
922 << DiagD->getDeclName();
924 if (FD->getStorageClass() == SC_Static &&
925 !FD->isInlineSpecified() &&
926 !SourceMgr.isInMainFile(
927 SourceMgr.getExpansionLoc(FD->getLocation())))
928 Diag(DiagD->getLocation(),
929 diag::warn_unneeded_static_internal_decl)
930 << DiagD->getDeclName();
932 Diag(DiagD->getLocation(), diag::warn_unneeded_internal_decl)
933 << /*function*/0 << DiagD->getDeclName();
936 if (FD->getDescribedFunctionTemplate())
937 Diag(DiagD->getLocation(), diag::warn_unused_template)
938 << /*function*/0 << DiagD->getDeclName();
940 Diag(DiagD->getLocation(),
941 isa<CXXMethodDecl>(DiagD) ? diag::warn_unused_member_function
942 : diag::warn_unused_function)
943 << DiagD->getDeclName();
946 const VarDecl *DiagD = cast<VarDecl>(*I)->getDefinition();
948 DiagD = cast<VarDecl>(*I);
949 if (DiagD->isReferenced()) {
950 Diag(DiagD->getLocation(), diag::warn_unneeded_internal_decl)
951 << /*variable*/1 << DiagD->getDeclName();
952 } else if (DiagD->getType().isConstQualified()) {
953 const SourceManager &SM = SourceMgr;
954 if (SM.getMainFileID() != SM.getFileID(DiagD->getLocation()) ||
955 !PP.getLangOpts().IsHeaderFile)
956 Diag(DiagD->getLocation(), diag::warn_unused_const_variable)
957 << DiagD->getDeclName();
959 if (DiagD->getDescribedVarTemplate())
960 Diag(DiagD->getLocation(), diag::warn_unused_template)
961 << /*variable*/1 << DiagD->getDeclName();
963 Diag(DiagD->getLocation(), diag::warn_unused_variable)
964 << DiagD->getDeclName();
969 emitAndClearUnusedLocalTypedefWarnings();
972 if (!Diags.isIgnored(diag::warn_unused_private_field, SourceLocation())) {
973 RecordCompleteMap RecordsComplete;
974 RecordCompleteMap MNCComplete;
975 for (NamedDeclSetType::iterator I = UnusedPrivateFields.begin(),
976 E = UnusedPrivateFields.end(); I != E; ++I) {
977 const NamedDecl *D = *I;
978 const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(D->getDeclContext());
979 if (RD && !RD->isUnion() &&
980 IsRecordFullyDefined(RD, RecordsComplete, MNCComplete)) {
981 Diag(D->getLocation(), diag::warn_unused_private_field)
987 if (!Diags.isIgnored(diag::warn_mismatched_delete_new, SourceLocation())) {
989 ExternalSource->ReadMismatchingDeleteExpressions(DeleteExprs);
990 for (const auto &DeletedFieldInfo : DeleteExprs) {
991 for (const auto &DeleteExprLoc : DeletedFieldInfo.second) {
992 AnalyzeDeleteExprMismatch(DeletedFieldInfo.first, DeleteExprLoc.first,
993 DeleteExprLoc.second);
998 // Check we've noticed that we're no longer parsing the initializer for every
999 // variable. If we miss cases, then at best we have a performance issue and
1000 // at worst a rejects-valid bug.
1001 assert(ParsingInitForAutoVars.empty() &&
1002 "Didn't unmark var as having its initializer parsed");
1004 if (!PP.isIncrementalProcessingEnabled())
1009 //===----------------------------------------------------------------------===//
1010 // Helper functions.
1011 //===----------------------------------------------------------------------===//
1013 DeclContext *Sema::getFunctionLevelDeclContext() {
1014 DeclContext *DC = CurContext;
1017 if (isa<BlockDecl>(DC) || isa<EnumDecl>(DC) || isa<CapturedDecl>(DC)) {
1018 DC = DC->getParent();
1019 } else if (isa<CXXMethodDecl>(DC) &&
1020 cast<CXXMethodDecl>(DC)->getOverloadedOperator() == OO_Call &&
1021 cast<CXXRecordDecl>(DC->getParent())->isLambda()) {
1022 DC = DC->getParent()->getParent();
1030 /// getCurFunctionDecl - If inside of a function body, this returns a pointer
1031 /// to the function decl for the function being parsed. If we're currently
1032 /// in a 'block', this returns the containing context.
1033 FunctionDecl *Sema::getCurFunctionDecl() {
1034 DeclContext *DC = getFunctionLevelDeclContext();
1035 return dyn_cast<FunctionDecl>(DC);
1038 ObjCMethodDecl *Sema::getCurMethodDecl() {
1039 DeclContext *DC = getFunctionLevelDeclContext();
1040 while (isa<RecordDecl>(DC))
1041 DC = DC->getParent();
1042 return dyn_cast<ObjCMethodDecl>(DC);
1045 NamedDecl *Sema::getCurFunctionOrMethodDecl() {
1046 DeclContext *DC = getFunctionLevelDeclContext();
1047 if (isa<ObjCMethodDecl>(DC) || isa<FunctionDecl>(DC))
1048 return cast<NamedDecl>(DC);
1052 void Sema::EmitCurrentDiagnostic(unsigned DiagID) {
1053 // FIXME: It doesn't make sense to me that DiagID is an incoming argument here
1054 // and yet we also use the current diag ID on the DiagnosticsEngine. This has
1055 // been made more painfully obvious by the refactor that introduced this
1056 // function, but it is possible that the incoming argument can be
1057 // eliminated. If it truly cannot be (for example, there is some reentrancy
1058 // issue I am not seeing yet), then there should at least be a clarifying
1059 // comment somewhere.
1060 if (Optional<TemplateDeductionInfo*> Info = isSFINAEContext()) {
1061 switch (DiagnosticIDs::getDiagnosticSFINAEResponse(
1062 Diags.getCurrentDiagID())) {
1063 case DiagnosticIDs::SFINAE_Report:
1064 // We'll report the diagnostic below.
1067 case DiagnosticIDs::SFINAE_SubstitutionFailure:
1068 // Count this failure so that we know that template argument deduction
1072 // Make a copy of this suppressed diagnostic and store it with the
1073 // template-deduction information.
1074 if (*Info && !(*Info)->hasSFINAEDiagnostic()) {
1075 Diagnostic DiagInfo(&Diags);
1076 (*Info)->addSFINAEDiagnostic(DiagInfo.getLocation(),
1077 PartialDiagnostic(DiagInfo, Context.getDiagAllocator()));
1080 Diags.setLastDiagnosticIgnored();
1084 case DiagnosticIDs::SFINAE_AccessControl: {
1085 // Per C++ Core Issue 1170, access control is part of SFINAE.
1086 // Additionally, the AccessCheckingSFINAE flag can be used to temporarily
1087 // make access control a part of SFINAE for the purposes of checking
1089 if (!AccessCheckingSFINAE && !getLangOpts().CPlusPlus11)
1092 SourceLocation Loc = Diags.getCurrentDiagLoc();
1094 // Suppress this diagnostic.
1097 // Make a copy of this suppressed diagnostic and store it with the
1098 // template-deduction information.
1099 if (*Info && !(*Info)->hasSFINAEDiagnostic()) {
1100 Diagnostic DiagInfo(&Diags);
1101 (*Info)->addSFINAEDiagnostic(DiagInfo.getLocation(),
1102 PartialDiagnostic(DiagInfo, Context.getDiagAllocator()));
1105 Diags.setLastDiagnosticIgnored();
1108 // Now the diagnostic state is clear, produce a C++98 compatibility
1110 Diag(Loc, diag::warn_cxx98_compat_sfinae_access_control);
1112 // The last diagnostic which Sema produced was ignored. Suppress any
1113 // notes attached to it.
1114 Diags.setLastDiagnosticIgnored();
1118 case DiagnosticIDs::SFINAE_Suppress:
1119 // Make a copy of this suppressed diagnostic and store it with the
1120 // template-deduction information;
1122 Diagnostic DiagInfo(&Diags);
1123 (*Info)->addSuppressedDiagnostic(DiagInfo.getLocation(),
1124 PartialDiagnostic(DiagInfo, Context.getDiagAllocator()));
1127 // Suppress this diagnostic.
1128 Diags.setLastDiagnosticIgnored();
1134 // Set up the context's printing policy based on our current state.
1135 Context.setPrintingPolicy(getPrintingPolicy());
1137 // Emit the diagnostic.
1138 if (!Diags.EmitCurrentDiagnostic())
1141 // If this is not a note, and we're in a template instantiation
1142 // that is different from the last template instantiation where
1143 // we emitted an error, print a template instantiation
1145 if (!DiagnosticIDs::isBuiltinNote(DiagID))
1146 PrintContextStack();
1149 Sema::SemaDiagnosticBuilder
1150 Sema::Diag(SourceLocation Loc, const PartialDiagnostic& PD) {
1151 SemaDiagnosticBuilder Builder(Diag(Loc, PD.getDiagID()));
1157 /// \brief Looks through the macro-expansion chain for the given
1158 /// location, looking for a macro expansion with the given name.
1159 /// If one is found, returns true and sets the location to that
1161 bool Sema::findMacroSpelling(SourceLocation &locref, StringRef name) {
1162 SourceLocation loc = locref;
1163 if (!loc.isMacroID()) return false;
1165 // There's no good way right now to look at the intermediate
1166 // expansions, so just jump to the expansion location.
1167 loc = getSourceManager().getExpansionLoc(loc);
1169 // If that's written with the name, stop here.
1170 SmallVector<char, 16> buffer;
1171 if (getPreprocessor().getSpelling(loc, buffer) == name) {
1178 /// \brief Determines the active Scope associated with the given declaration
1181 /// This routine maps a declaration context to the active Scope object that
1182 /// represents that declaration context in the parser. It is typically used
1183 /// from "scope-less" code (e.g., template instantiation, lazy creation of
1184 /// declarations) that injects a name for name-lookup purposes and, therefore,
1185 /// must update the Scope.
1187 /// \returns The scope corresponding to the given declaraion context, or NULL
1188 /// if no such scope is open.
1189 Scope *Sema::getScopeForContext(DeclContext *Ctx) {
1194 Ctx = Ctx->getPrimaryContext();
1195 for (Scope *S = getCurScope(); S; S = S->getParent()) {
1196 // Ignore scopes that cannot have declarations. This is important for
1197 // out-of-line definitions of static class members.
1198 if (S->getFlags() & (Scope::DeclScope | Scope::TemplateParamScope))
1199 if (DeclContext *Entity = S->getEntity())
1200 if (Ctx == Entity->getPrimaryContext())
1207 /// \brief Enter a new function scope
1208 void Sema::PushFunctionScope() {
1209 if (FunctionScopes.size() == 1) {
1210 // Use the "top" function scope rather than having to allocate
1211 // memory for a new scope.
1212 FunctionScopes.back()->Clear();
1213 FunctionScopes.push_back(FunctionScopes.back());
1214 if (LangOpts.OpenMP)
1215 pushOpenMPFunctionRegion();
1219 FunctionScopes.push_back(new FunctionScopeInfo(getDiagnostics()));
1220 if (LangOpts.OpenMP)
1221 pushOpenMPFunctionRegion();
1224 void Sema::PushBlockScope(Scope *BlockScope, BlockDecl *Block) {
1225 FunctionScopes.push_back(new BlockScopeInfo(getDiagnostics(),
1226 BlockScope, Block));
1229 LambdaScopeInfo *Sema::PushLambdaScope() {
1230 LambdaScopeInfo *const LSI = new LambdaScopeInfo(getDiagnostics());
1231 FunctionScopes.push_back(LSI);
1235 void Sema::RecordParsingTemplateParameterDepth(unsigned Depth) {
1236 if (LambdaScopeInfo *const LSI = getCurLambda()) {
1237 LSI->AutoTemplateParameterDepth = Depth;
1241 "Remove assertion if intentionally called in a non-lambda context.");
1244 void Sema::PopFunctionScopeInfo(const AnalysisBasedWarnings::Policy *WP,
1245 const Decl *D, const BlockExpr *blkExpr) {
1246 FunctionScopeInfo *Scope = FunctionScopes.pop_back_val();
1247 assert(!FunctionScopes.empty() && "mismatched push/pop!");
1249 if (LangOpts.OpenMP)
1250 popOpenMPFunctionRegion(Scope);
1252 // Issue any analysis-based warnings.
1254 AnalysisWarnings.IssueWarnings(*WP, Scope, D, blkExpr);
1256 for (const auto &PUD : Scope->PossiblyUnreachableDiags)
1257 Diag(PUD.Loc, PUD.PD);
1259 if (FunctionScopes.back() != Scope)
1263 void Sema::PushCompoundScope() {
1264 getCurFunction()->CompoundScopes.push_back(CompoundScopeInfo());
1267 void Sema::PopCompoundScope() {
1268 FunctionScopeInfo *CurFunction = getCurFunction();
1269 assert(!CurFunction->CompoundScopes.empty() && "mismatched push/pop");
1271 CurFunction->CompoundScopes.pop_back();
1274 /// \brief Determine whether any errors occurred within this function/method/
1276 bool Sema::hasAnyUnrecoverableErrorsInThisFunction() const {
1277 return getCurFunction()->ErrorTrap.hasUnrecoverableErrorOccurred();
1280 BlockScopeInfo *Sema::getCurBlock() {
1281 if (FunctionScopes.empty())
1284 auto CurBSI = dyn_cast<BlockScopeInfo>(FunctionScopes.back());
1285 if (CurBSI && CurBSI->TheDecl &&
1286 !CurBSI->TheDecl->Encloses(CurContext)) {
1287 // We have switched contexts due to template instantiation.
1288 assert(!CodeSynthesisContexts.empty());
1295 LambdaScopeInfo *Sema::getCurLambda(bool IgnoreNonLambdaCapturingScope) {
1296 if (FunctionScopes.empty())
1299 auto I = FunctionScopes.rbegin();
1300 if (IgnoreNonLambdaCapturingScope) {
1301 auto E = FunctionScopes.rend();
1302 while (I != E && isa<CapturingScopeInfo>(*I) && !isa<LambdaScopeInfo>(*I))
1307 auto *CurLSI = dyn_cast<LambdaScopeInfo>(*I);
1308 if (CurLSI && CurLSI->Lambda &&
1309 !CurLSI->Lambda->Encloses(CurContext)) {
1310 // We have switched contexts due to template instantiation.
1311 assert(!CodeSynthesisContexts.empty());
1317 // We have a generic lambda if we parsed auto parameters, or we have
1318 // an associated template parameter list.
1319 LambdaScopeInfo *Sema::getCurGenericLambda() {
1320 if (LambdaScopeInfo *LSI = getCurLambda()) {
1321 return (LSI->AutoTemplateParams.size() ||
1322 LSI->GLTemplateParameterList) ? LSI : nullptr;
1328 void Sema::ActOnComment(SourceRange Comment) {
1329 if (!LangOpts.RetainCommentsFromSystemHeaders &&
1330 SourceMgr.isInSystemHeader(Comment.getBegin()))
1332 RawComment RC(SourceMgr, Comment, false,
1333 LangOpts.CommentOpts.ParseAllComments);
1334 if (RC.isAlmostTrailingComment()) {
1335 SourceRange MagicMarkerRange(Comment.getBegin(),
1336 Comment.getBegin().getLocWithOffset(3));
1337 StringRef MagicMarkerText;
1338 switch (RC.getKind()) {
1339 case RawComment::RCK_OrdinaryBCPL:
1340 MagicMarkerText = "///<";
1342 case RawComment::RCK_OrdinaryC:
1343 MagicMarkerText = "/**<";
1346 llvm_unreachable("if this is an almost Doxygen comment, "
1347 "it should be ordinary");
1349 Diag(Comment.getBegin(), diag::warn_not_a_doxygen_trailing_member_comment) <<
1350 FixItHint::CreateReplacement(MagicMarkerRange, MagicMarkerText);
1352 Context.addComment(RC);
1355 // Pin this vtable to this file.
1356 ExternalSemaSource::~ExternalSemaSource() {}
1358 void ExternalSemaSource::ReadMethodPool(Selector Sel) { }
1359 void ExternalSemaSource::updateOutOfDateSelector(Selector Sel) { }
1361 void ExternalSemaSource::ReadKnownNamespaces(
1362 SmallVectorImpl<NamespaceDecl *> &Namespaces) {
1365 void ExternalSemaSource::ReadUndefinedButUsed(
1366 llvm::MapVector<NamedDecl *, SourceLocation> &Undefined) {}
1368 void ExternalSemaSource::ReadMismatchingDeleteExpressions(llvm::MapVector<
1369 FieldDecl *, llvm::SmallVector<std::pair<SourceLocation, bool>, 4>> &) {}
1371 void PrettyDeclStackTraceEntry::print(raw_ostream &OS) const {
1372 SourceLocation Loc = this->Loc;
1373 if (!Loc.isValid() && TheDecl) Loc = TheDecl->getLocation();
1374 if (Loc.isValid()) {
1375 Loc.print(OS, S.getSourceManager());
1380 if (auto *ND = dyn_cast_or_null<NamedDecl>(TheDecl)) {
1382 ND->getNameForDiagnostic(OS, ND->getASTContext().getPrintingPolicy(), true);
1389 /// \brief Figure out if an expression could be turned into a call.
1391 /// Use this when trying to recover from an error where the programmer may have
1392 /// written just the name of a function instead of actually calling it.
1394 /// \param E - The expression to examine.
1395 /// \param ZeroArgCallReturnTy - If the expression can be turned into a call
1396 /// with no arguments, this parameter is set to the type returned by such a
1397 /// call; otherwise, it is set to an empty QualType.
1398 /// \param OverloadSet - If the expression is an overloaded function
1399 /// name, this parameter is populated with the decls of the various overloads.
1400 bool Sema::tryExprAsCall(Expr &E, QualType &ZeroArgCallReturnTy,
1401 UnresolvedSetImpl &OverloadSet) {
1402 ZeroArgCallReturnTy = QualType();
1403 OverloadSet.clear();
1405 const OverloadExpr *Overloads = nullptr;
1406 bool IsMemExpr = false;
1407 if (E.getType() == Context.OverloadTy) {
1408 OverloadExpr::FindResult FR = OverloadExpr::find(const_cast<Expr*>(&E));
1410 // Ignore overloads that are pointer-to-member constants.
1411 if (FR.HasFormOfMemberPointer)
1414 Overloads = FR.Expression;
1415 } else if (E.getType() == Context.BoundMemberTy) {
1416 Overloads = dyn_cast<UnresolvedMemberExpr>(E.IgnoreParens());
1420 bool Ambiguous = false;
1423 for (OverloadExpr::decls_iterator it = Overloads->decls_begin(),
1424 DeclsEnd = Overloads->decls_end(); it != DeclsEnd; ++it) {
1425 OverloadSet.addDecl(*it);
1427 // Check whether the function is a non-template, non-member which takes no
1431 if (const FunctionDecl *OverloadDecl
1432 = dyn_cast<FunctionDecl>((*it)->getUnderlyingDecl())) {
1433 if (OverloadDecl->getMinRequiredArguments() == 0) {
1434 if (!ZeroArgCallReturnTy.isNull() && !Ambiguous) {
1435 ZeroArgCallReturnTy = QualType();
1438 ZeroArgCallReturnTy = OverloadDecl->getReturnType();
1443 // If it's not a member, use better machinery to try to resolve the call
1445 return !ZeroArgCallReturnTy.isNull();
1448 // Attempt to call the member with no arguments - this will correctly handle
1449 // member templates with defaults/deduction of template arguments, overloads
1450 // with default arguments, etc.
1451 if (IsMemExpr && !E.isTypeDependent()) {
1452 bool Suppress = getDiagnostics().getSuppressAllDiagnostics();
1453 getDiagnostics().setSuppressAllDiagnostics(true);
1454 ExprResult R = BuildCallToMemberFunction(nullptr, &E, SourceLocation(),
1455 None, SourceLocation());
1456 getDiagnostics().setSuppressAllDiagnostics(Suppress);
1458 ZeroArgCallReturnTy = R.get()->getType();
1464 if (const DeclRefExpr *DeclRef = dyn_cast<DeclRefExpr>(E.IgnoreParens())) {
1465 if (const FunctionDecl *Fun = dyn_cast<FunctionDecl>(DeclRef->getDecl())) {
1466 if (Fun->getMinRequiredArguments() == 0)
1467 ZeroArgCallReturnTy = Fun->getReturnType();
1472 // We don't have an expression that's convenient to get a FunctionDecl from,
1473 // but we can at least check if the type is "function of 0 arguments".
1474 QualType ExprTy = E.getType();
1475 const FunctionType *FunTy = nullptr;
1476 QualType PointeeTy = ExprTy->getPointeeType();
1477 if (!PointeeTy.isNull())
1478 FunTy = PointeeTy->getAs<FunctionType>();
1480 FunTy = ExprTy->getAs<FunctionType>();
1482 if (const FunctionProtoType *FPT =
1483 dyn_cast_or_null<FunctionProtoType>(FunTy)) {
1484 if (FPT->getNumParams() == 0)
1485 ZeroArgCallReturnTy = FunTy->getReturnType();
1491 /// \brief Give notes for a set of overloads.
1493 /// A companion to tryExprAsCall. In cases when the name that the programmer
1494 /// wrote was an overloaded function, we may be able to make some guesses about
1495 /// plausible overloads based on their return types; such guesses can be handed
1496 /// off to this method to be emitted as notes.
1498 /// \param Overloads - The overloads to note.
1499 /// \param FinalNoteLoc - If we've suppressed printing some overloads due to
1500 /// -fshow-overloads=best, this is the location to attach to the note about too
1501 /// many candidates. Typically this will be the location of the original
1502 /// ill-formed expression.
1503 static void noteOverloads(Sema &S, const UnresolvedSetImpl &Overloads,
1504 const SourceLocation FinalNoteLoc) {
1505 int ShownOverloads = 0;
1506 int SuppressedOverloads = 0;
1507 for (UnresolvedSetImpl::iterator It = Overloads.begin(),
1508 DeclsEnd = Overloads.end(); It != DeclsEnd; ++It) {
1509 // FIXME: Magic number for max shown overloads stolen from
1510 // OverloadCandidateSet::NoteCandidates.
1511 if (ShownOverloads >= 4 && S.Diags.getShowOverloads() == Ovl_Best) {
1512 ++SuppressedOverloads;
1516 NamedDecl *Fn = (*It)->getUnderlyingDecl();
1517 S.Diag(Fn->getLocation(), diag::note_possible_target_of_call);
1521 if (SuppressedOverloads)
1522 S.Diag(FinalNoteLoc, diag::note_ovl_too_many_candidates)
1523 << SuppressedOverloads;
1526 static void notePlausibleOverloads(Sema &S, SourceLocation Loc,
1527 const UnresolvedSetImpl &Overloads,
1528 bool (*IsPlausibleResult)(QualType)) {
1529 if (!IsPlausibleResult)
1530 return noteOverloads(S, Overloads, Loc);
1532 UnresolvedSet<2> PlausibleOverloads;
1533 for (OverloadExpr::decls_iterator It = Overloads.begin(),
1534 DeclsEnd = Overloads.end(); It != DeclsEnd; ++It) {
1535 const FunctionDecl *OverloadDecl = cast<FunctionDecl>(*It);
1536 QualType OverloadResultTy = OverloadDecl->getReturnType();
1537 if (IsPlausibleResult(OverloadResultTy))
1538 PlausibleOverloads.addDecl(It.getDecl());
1540 noteOverloads(S, PlausibleOverloads, Loc);
1543 /// Determine whether the given expression can be called by just
1544 /// putting parentheses after it. Notably, expressions with unary
1545 /// operators can't be because the unary operator will start parsing
1546 /// outside the call.
1547 static bool IsCallableWithAppend(Expr *E) {
1548 E = E->IgnoreImplicit();
1549 return (!isa<CStyleCastExpr>(E) &&
1550 !isa<UnaryOperator>(E) &&
1551 !isa<BinaryOperator>(E) &&
1552 !isa<CXXOperatorCallExpr>(E));
1555 bool Sema::tryToRecoverWithCall(ExprResult &E, const PartialDiagnostic &PD,
1557 bool (*IsPlausibleResult)(QualType)) {
1558 SourceLocation Loc = E.get()->getExprLoc();
1559 SourceRange Range = E.get()->getSourceRange();
1561 QualType ZeroArgCallTy;
1562 UnresolvedSet<4> Overloads;
1563 if (tryExprAsCall(*E.get(), ZeroArgCallTy, Overloads) &&
1564 !ZeroArgCallTy.isNull() &&
1565 (!IsPlausibleResult || IsPlausibleResult(ZeroArgCallTy))) {
1566 // At this point, we know E is potentially callable with 0
1567 // arguments and that it returns something of a reasonable type,
1568 // so we can emit a fixit and carry on pretending that E was
1569 // actually a CallExpr.
1570 SourceLocation ParenInsertionLoc = getLocForEndOfToken(Range.getEnd());
1572 << /*zero-arg*/ 1 << Range
1573 << (IsCallableWithAppend(E.get())
1574 ? FixItHint::CreateInsertion(ParenInsertionLoc, "()")
1576 notePlausibleOverloads(*this, Loc, Overloads, IsPlausibleResult);
1578 // FIXME: Try this before emitting the fixit, and suppress diagnostics
1580 E = ActOnCallExpr(nullptr, E.get(), Range.getEnd(), None,
1581 Range.getEnd().getLocWithOffset(1));
1585 if (!ForceComplain) return false;
1587 Diag(Loc, PD) << /*not zero-arg*/ 0 << Range;
1588 notePlausibleOverloads(*this, Loc, Overloads, IsPlausibleResult);
1593 IdentifierInfo *Sema::getSuperIdentifier() const {
1595 Ident_super = &Context.Idents.get("super");
1599 IdentifierInfo *Sema::getFloat128Identifier() const {
1600 if (!Ident___float128)
1601 Ident___float128 = &Context.Idents.get("__float128");
1602 return Ident___float128;
1605 void Sema::PushCapturedRegionScope(Scope *S, CapturedDecl *CD, RecordDecl *RD,
1606 CapturedRegionKind K) {
1607 CapturingScopeInfo *CSI = new CapturedRegionScopeInfo(
1608 getDiagnostics(), S, CD, RD, CD->getContextParam(), K,
1609 (getLangOpts().OpenMP && K == CR_OpenMP) ? getOpenMPNestingLevel() : 0);
1610 CSI->ReturnType = Context.VoidTy;
1611 FunctionScopes.push_back(CSI);
1614 CapturedRegionScopeInfo *Sema::getCurCapturedRegion() {
1615 if (FunctionScopes.empty())
1618 return dyn_cast<CapturedRegionScopeInfo>(FunctionScopes.back());
1621 const llvm::MapVector<FieldDecl *, Sema::DeleteLocs> &
1622 Sema::getMismatchingDeleteExpressions() const {
1626 void Sema::setOpenCLExtensionForType(QualType T, llvm::StringRef ExtStr) {
1629 llvm::SmallVector<StringRef, 1> Exts;
1630 ExtStr.split(Exts, " ", /* limit */ -1, /* keep empty */ false);
1631 auto CanT = T.getCanonicalType().getTypePtr();
1632 for (auto &I : Exts)
1633 OpenCLTypeExtMap[CanT].insert(I.str());
1636 void Sema::setOpenCLExtensionForDecl(Decl *FD, StringRef ExtStr) {
1637 llvm::SmallVector<StringRef, 1> Exts;
1638 ExtStr.split(Exts, " ", /* limit */ -1, /* keep empty */ false);
1641 for (auto &I : Exts)
1642 OpenCLDeclExtMap[FD].insert(I.str());
1645 void Sema::setCurrentOpenCLExtensionForType(QualType T) {
1646 if (CurrOpenCLExtension.empty())
1648 setOpenCLExtensionForType(T, CurrOpenCLExtension);
1651 void Sema::setCurrentOpenCLExtensionForDecl(Decl *D) {
1652 if (CurrOpenCLExtension.empty())
1654 setOpenCLExtensionForDecl(D, CurrOpenCLExtension);
1657 bool Sema::isOpenCLDisabledDecl(Decl *FD) {
1658 auto Loc = OpenCLDeclExtMap.find(FD);
1659 if (Loc == OpenCLDeclExtMap.end())
1661 for (auto &I : Loc->second) {
1662 if (!getOpenCLOptions().isEnabled(I))
1668 template <typename T, typename DiagLocT, typename DiagInfoT, typename MapT>
1669 bool Sema::checkOpenCLDisabledTypeOrDecl(T D, DiagLocT DiagLoc,
1670 DiagInfoT DiagInfo, MapT &Map,
1672 SourceRange SrcRange) {
1673 auto Loc = Map.find(D);
1674 if (Loc == Map.end())
1676 bool Disabled = false;
1677 for (auto &I : Loc->second) {
1678 if (I != CurrOpenCLExtension && !getOpenCLOptions().isEnabled(I)) {
1679 Diag(DiagLoc, diag::err_opencl_requires_extension) << Selector << DiagInfo
1687 bool Sema::checkOpenCLDisabledTypeDeclSpec(const DeclSpec &DS, QualType QT) {
1688 // Check extensions for declared types.
1689 Decl *Decl = nullptr;
1690 if (auto TypedefT = dyn_cast<TypedefType>(QT.getTypePtr()))
1691 Decl = TypedefT->getDecl();
1692 if (auto TagT = dyn_cast<TagType>(QT.getCanonicalType().getTypePtr()))
1693 Decl = TagT->getDecl();
1694 auto Loc = DS.getTypeSpecTypeLoc();
1695 if (checkOpenCLDisabledTypeOrDecl(Decl, Loc, QT, OpenCLDeclExtMap))
1698 // Check extensions for builtin types.
1699 return checkOpenCLDisabledTypeOrDecl(QT.getCanonicalType().getTypePtr(), Loc,
1700 QT, OpenCLTypeExtMap);
1703 bool Sema::checkOpenCLDisabledDecl(const NamedDecl &D, const Expr &E) {
1704 IdentifierInfo *FnName = D.getIdentifier();
1705 return checkOpenCLDisabledTypeOrDecl(&D, E.getLocStart(), FnName,
1706 OpenCLDeclExtMap, 1, D.getSourceRange());