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), CachedFakeTopLevelModule(nullptr),
97 AccessCheckingSFINAE(false), InNonInstantiationSFINAEContext(false),
98 NonInstantiationEntries(0), ArgumentPackSubstitutionIndex(-1),
99 CurrentInstantiationScope(nullptr), DisableTypoCorrection(false),
100 TyposCorrected(0), AnalysisWarnings(*this),
101 ThreadSafetyDeclCache(nullptr), VarDataSharingAttributesStack(nullptr),
102 CurScope(nullptr), Ident_super(nullptr), Ident___float128(nullptr) {
105 LoadedExternalKnownNamespaces = false;
106 for (unsigned I = 0; I != NSAPI::NumNSNumberLiteralMethods; ++I)
107 NSNumberLiteralMethods[I] = nullptr;
109 if (getLangOpts().ObjC1)
110 NSAPIObj.reset(new NSAPI(Context));
112 if (getLangOpts().CPlusPlus)
113 FieldCollector.reset(new CXXFieldCollector());
115 // Tell diagnostics how to render things from the AST library.
116 Diags.SetArgToStringFn(&FormatASTNodeDiagnosticArgument, &Context);
118 ExprEvalContexts.emplace_back(
119 ExpressionEvaluationContext::PotentiallyEvaluated, 0, CleanupInfo{},
122 FunctionScopes.push_back(new FunctionScopeInfo(Diags));
124 // Initilization of data sharing attributes stack for OpenMP
125 InitDataSharingAttributesStack();
128 void Sema::addImplicitTypedef(StringRef Name, QualType T) {
129 DeclarationName DN = &Context.Idents.get(Name);
130 if (IdResolver.begin(DN) == IdResolver.end())
131 PushOnScopeChains(Context.buildImplicitTypedef(T, Name), TUScope);
134 void Sema::Initialize() {
135 if (SemaConsumer *SC = dyn_cast<SemaConsumer>(&Consumer))
136 SC->InitializeSema(*this);
138 // Tell the external Sema source about this Sema object.
139 if (ExternalSemaSource *ExternalSema
140 = dyn_cast_or_null<ExternalSemaSource>(Context.getExternalSource()))
141 ExternalSema->InitializeSema(*this);
143 // This needs to happen after ExternalSemaSource::InitializeSema(this) or we
144 // will not be able to merge any duplicate __va_list_tag decls correctly.
145 VAListTagName = PP.getIdentifierInfo("__va_list_tag");
150 // Initialize predefined 128-bit integer types, if needed.
151 if (Context.getTargetInfo().hasInt128Type()) {
152 // If either of the 128-bit integer types are unavailable to name lookup,
154 DeclarationName Int128 = &Context.Idents.get("__int128_t");
155 if (IdResolver.begin(Int128) == IdResolver.end())
156 PushOnScopeChains(Context.getInt128Decl(), TUScope);
158 DeclarationName UInt128 = &Context.Idents.get("__uint128_t");
159 if (IdResolver.begin(UInt128) == IdResolver.end())
160 PushOnScopeChains(Context.getUInt128Decl(), TUScope);
164 // Initialize predefined Objective-C types:
165 if (getLangOpts().ObjC1) {
166 // If 'SEL' does not yet refer to any declarations, make it refer to the
168 DeclarationName SEL = &Context.Idents.get("SEL");
169 if (IdResolver.begin(SEL) == IdResolver.end())
170 PushOnScopeChains(Context.getObjCSelDecl(), TUScope);
172 // If 'id' does not yet refer to any declarations, make it refer to the
174 DeclarationName Id = &Context.Idents.get("id");
175 if (IdResolver.begin(Id) == IdResolver.end())
176 PushOnScopeChains(Context.getObjCIdDecl(), TUScope);
178 // Create the built-in typedef for 'Class'.
179 DeclarationName Class = &Context.Idents.get("Class");
180 if (IdResolver.begin(Class) == IdResolver.end())
181 PushOnScopeChains(Context.getObjCClassDecl(), TUScope);
183 // Create the built-in forward declaratino for 'Protocol'.
184 DeclarationName Protocol = &Context.Idents.get("Protocol");
185 if (IdResolver.begin(Protocol) == IdResolver.end())
186 PushOnScopeChains(Context.getObjCProtocolDecl(), TUScope);
189 // Create the internal type for the *StringMakeConstantString builtins.
190 DeclarationName ConstantString = &Context.Idents.get("__NSConstantString");
191 if (IdResolver.begin(ConstantString) == IdResolver.end())
192 PushOnScopeChains(Context.getCFConstantStringDecl(), 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 and supported extensions and (optional)
206 if (getLangOpts().OpenCL) {
207 getOpenCLOptions().addSupport(Context.getTargetInfo().getSupportedOpenCLOpts());
208 getOpenCLOptions().enableSupportedCore(getLangOpts().OpenCLVersion);
209 addImplicitTypedef("sampler_t", Context.OCLSamplerTy);
210 addImplicitTypedef("event_t", Context.OCLEventTy);
211 if (getLangOpts().OpenCLVersion >= 200) {
212 addImplicitTypedef("clk_event_t", Context.OCLClkEventTy);
213 addImplicitTypedef("queue_t", Context.OCLQueueTy);
214 addImplicitTypedef("reserve_id_t", Context.OCLReserveIDTy);
215 addImplicitTypedef("atomic_int", Context.getAtomicType(Context.IntTy));
216 addImplicitTypedef("atomic_uint",
217 Context.getAtomicType(Context.UnsignedIntTy));
218 auto AtomicLongT = Context.getAtomicType(Context.LongTy);
219 addImplicitTypedef("atomic_long", AtomicLongT);
220 auto AtomicULongT = Context.getAtomicType(Context.UnsignedLongTy);
221 addImplicitTypedef("atomic_ulong", AtomicULongT);
222 addImplicitTypedef("atomic_float",
223 Context.getAtomicType(Context.FloatTy));
224 auto AtomicDoubleT = Context.getAtomicType(Context.DoubleTy);
225 addImplicitTypedef("atomic_double", AtomicDoubleT);
226 // OpenCLC v2.0, s6.13.11.6 requires that atomic_flag is implemented as
227 // 32-bit integer and OpenCLC v2.0, s6.1.1 int is always 32-bit wide.
228 addImplicitTypedef("atomic_flag", Context.getAtomicType(Context.IntTy));
229 auto AtomicIntPtrT = Context.getAtomicType(Context.getIntPtrType());
230 addImplicitTypedef("atomic_intptr_t", AtomicIntPtrT);
231 auto AtomicUIntPtrT = Context.getAtomicType(Context.getUIntPtrType());
232 addImplicitTypedef("atomic_uintptr_t", AtomicUIntPtrT);
233 auto AtomicSizeT = Context.getAtomicType(Context.getSizeType());
234 addImplicitTypedef("atomic_size_t", AtomicSizeT);
235 auto AtomicPtrDiffT = Context.getAtomicType(Context.getPointerDiffType());
236 addImplicitTypedef("atomic_ptrdiff_t", AtomicPtrDiffT);
238 // OpenCL v2.0 s6.13.11.6:
239 // - The atomic_long and atomic_ulong types are supported if the
240 // cl_khr_int64_base_atomics and cl_khr_int64_extended_atomics
241 // extensions are supported.
242 // - The atomic_double type is only supported if double precision
243 // is supported and the cl_khr_int64_base_atomics and
244 // cl_khr_int64_extended_atomics extensions are supported.
245 // - If the device address space is 64-bits, the data types
246 // atomic_intptr_t, atomic_uintptr_t, atomic_size_t and
247 // atomic_ptrdiff_t are supported if the cl_khr_int64_base_atomics and
248 // cl_khr_int64_extended_atomics extensions are supported.
249 std::vector<QualType> Atomic64BitTypes;
250 Atomic64BitTypes.push_back(AtomicLongT);
251 Atomic64BitTypes.push_back(AtomicULongT);
252 Atomic64BitTypes.push_back(AtomicDoubleT);
253 if (Context.getTypeSize(AtomicSizeT) == 64) {
254 Atomic64BitTypes.push_back(AtomicSizeT);
255 Atomic64BitTypes.push_back(AtomicIntPtrT);
256 Atomic64BitTypes.push_back(AtomicUIntPtrT);
257 Atomic64BitTypes.push_back(AtomicPtrDiffT);
259 for (auto &I : Atomic64BitTypes)
260 setOpenCLExtensionForType(I,
261 "cl_khr_int64_base_atomics cl_khr_int64_extended_atomics");
263 setOpenCLExtensionForType(AtomicDoubleT, "cl_khr_fp64");
266 setOpenCLExtensionForType(Context.DoubleTy, "cl_khr_fp64");
268 #define GENERIC_IMAGE_TYPE_EXT(Type, Id, Ext) \
269 setOpenCLExtensionForType(Context.Id, Ext);
270 #include "clang/Basic/OpenCLImageTypes.def"
273 if (Context.getTargetInfo().hasBuiltinMSVaList()) {
274 DeclarationName MSVaList = &Context.Idents.get("__builtin_ms_va_list");
275 if (IdResolver.begin(MSVaList) == IdResolver.end())
276 PushOnScopeChains(Context.getBuiltinMSVaListDecl(), TUScope);
279 DeclarationName BuiltinVaList = &Context.Idents.get("__builtin_va_list");
280 if (IdResolver.begin(BuiltinVaList) == IdResolver.end())
281 PushOnScopeChains(Context.getBuiltinVaListDecl(), TUScope);
285 if (VisContext) FreeVisContext();
286 // Kill all the active scopes.
287 for (unsigned I = 1, E = FunctionScopes.size(); I != E; ++I)
288 delete FunctionScopes[I];
289 if (FunctionScopes.size() == 1)
290 delete FunctionScopes[0];
292 // Tell the SemaConsumer to forget about us; we're going out of scope.
293 if (SemaConsumer *SC = dyn_cast<SemaConsumer>(&Consumer))
296 // Detach from the external Sema source.
297 if (ExternalSemaSource *ExternalSema
298 = dyn_cast_or_null<ExternalSemaSource>(Context.getExternalSource()))
299 ExternalSema->ForgetSema();
301 // If Sema's ExternalSource is the multiplexer - we own it.
302 if (isMultiplexExternalSource)
303 delete ExternalSource;
305 threadSafety::threadSafetyCleanup(ThreadSafetyDeclCache);
307 // Destroys data sharing attributes stack for OpenMP
308 DestroyDataSharingAttributesStack();
310 assert(DelayedTypos.empty() && "Uncorrected typos!");
313 /// makeUnavailableInSystemHeader - There is an error in the current
314 /// context. If we're still in a system header, and we can plausibly
315 /// make the relevant declaration unavailable instead of erroring, do
316 /// so and return true.
317 bool Sema::makeUnavailableInSystemHeader(SourceLocation loc,
318 UnavailableAttr::ImplicitReason reason) {
319 // If we're not in a function, it's an error.
320 FunctionDecl *fn = dyn_cast<FunctionDecl>(CurContext);
321 if (!fn) return false;
323 // If we're in template instantiation, it's an error.
324 if (inTemplateInstantiation())
327 // If that function's not in a system header, it's an error.
328 if (!Context.getSourceManager().isInSystemHeader(loc))
331 // If the function is already unavailable, it's not an error.
332 if (fn->hasAttr<UnavailableAttr>()) return true;
334 fn->addAttr(UnavailableAttr::CreateImplicit(Context, "", reason, loc));
338 ASTMutationListener *Sema::getASTMutationListener() const {
339 return getASTConsumer().GetASTMutationListener();
342 ///\brief Registers an external source. If an external source already exists,
343 /// creates a multiplex external source and appends to it.
345 ///\param[in] E - A non-null external sema source.
347 void Sema::addExternalSource(ExternalSemaSource *E) {
348 assert(E && "Cannot use with NULL ptr");
350 if (!ExternalSource) {
355 if (isMultiplexExternalSource)
356 static_cast<MultiplexExternalSemaSource*>(ExternalSource)->addSource(*E);
358 ExternalSource = new MultiplexExternalSemaSource(*ExternalSource, *E);
359 isMultiplexExternalSource = true;
363 /// \brief Print out statistics about the semantic analysis.
364 void Sema::PrintStats() const {
365 llvm::errs() << "\n*** Semantic Analysis Stats:\n";
366 llvm::errs() << NumSFINAEErrors << " SFINAE diagnostics trapped.\n";
368 BumpAlloc.PrintStats();
369 AnalysisWarnings.PrintStats();
372 void Sema::diagnoseNullableToNonnullConversion(QualType DstType,
374 SourceLocation Loc) {
375 Optional<NullabilityKind> ExprNullability = SrcType->getNullability(Context);
376 if (!ExprNullability || *ExprNullability != NullabilityKind::Nullable)
379 Optional<NullabilityKind> TypeNullability = DstType->getNullability(Context);
380 if (!TypeNullability || *TypeNullability != NullabilityKind::NonNull)
383 Diag(Loc, diag::warn_nullability_lost) << SrcType << DstType;
386 /// ImpCastExprToType - If Expr is not of type 'Type', insert an implicit cast.
387 /// If there is already an implicit cast, merge into the existing one.
388 /// The result is of the given category.
389 ExprResult Sema::ImpCastExprToType(Expr *E, QualType Ty,
390 CastKind Kind, ExprValueKind VK,
391 const CXXCastPath *BasePath,
392 CheckedConversionKind CCK) {
394 if (VK == VK_RValue && !E->isRValue()) {
397 llvm_unreachable("can't implicitly cast lvalue to rvalue with this cast "
399 case CK_LValueToRValue:
400 case CK_ArrayToPointerDecay:
401 case CK_FunctionToPointerDecay:
406 assert((VK == VK_RValue || !E->isRValue()) && "can't cast rvalue to lvalue");
409 diagnoseNullableToNonnullConversion(Ty, E->getType(), E->getLocStart());
411 QualType ExprTy = Context.getCanonicalType(E->getType());
412 QualType TypeTy = Context.getCanonicalType(Ty);
414 if (ExprTy == TypeTy)
417 // C++1z [conv.array]: The temporary materialization conversion is applied.
418 // We also use this to fuel C++ DR1213, which applies to C++11 onwards.
419 if (Kind == CK_ArrayToPointerDecay && getLangOpts().CPlusPlus &&
420 E->getValueKind() == VK_RValue) {
421 // The temporary is an lvalue in C++98 and an xvalue otherwise.
422 ExprResult Materialized = CreateMaterializeTemporaryExpr(
423 E->getType(), E, !getLangOpts().CPlusPlus11);
424 if (Materialized.isInvalid())
426 E = Materialized.get();
429 if (ImplicitCastExpr *ImpCast = dyn_cast<ImplicitCastExpr>(E)) {
430 if (ImpCast->getCastKind() == Kind && (!BasePath || BasePath->empty())) {
431 ImpCast->setType(Ty);
432 ImpCast->setValueKind(VK);
437 return ImplicitCastExpr::Create(Context, Ty, Kind, E, BasePath, VK);
440 /// ScalarTypeToBooleanCastKind - Returns the cast kind corresponding
441 /// to the conversion from scalar type ScalarTy to the Boolean type.
442 CastKind Sema::ScalarTypeToBooleanCastKind(QualType ScalarTy) {
443 switch (ScalarTy->getScalarTypeKind()) {
444 case Type::STK_Bool: return CK_NoOp;
445 case Type::STK_CPointer: return CK_PointerToBoolean;
446 case Type::STK_BlockPointer: return CK_PointerToBoolean;
447 case Type::STK_ObjCObjectPointer: return CK_PointerToBoolean;
448 case Type::STK_MemberPointer: return CK_MemberPointerToBoolean;
449 case Type::STK_Integral: return CK_IntegralToBoolean;
450 case Type::STK_Floating: return CK_FloatingToBoolean;
451 case Type::STK_IntegralComplex: return CK_IntegralComplexToBoolean;
452 case Type::STK_FloatingComplex: return CK_FloatingComplexToBoolean;
457 /// \brief Used to prune the decls of Sema's UnusedFileScopedDecls vector.
458 static bool ShouldRemoveFromUnused(Sema *SemaRef, const DeclaratorDecl *D) {
459 if (D->getMostRecentDecl()->isUsed())
462 if (D->isExternallyVisible())
465 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
466 // UnusedFileScopedDecls stores the first declaration.
467 // The declaration may have become definition so check again.
468 const FunctionDecl *DeclToCheck;
469 if (FD->hasBody(DeclToCheck))
470 return !SemaRef->ShouldWarnIfUnusedFileScopedDecl(DeclToCheck);
472 // Later redecls may add new information resulting in not having to warn,
474 DeclToCheck = FD->getMostRecentDecl();
475 if (DeclToCheck != FD)
476 return !SemaRef->ShouldWarnIfUnusedFileScopedDecl(DeclToCheck);
479 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) {
480 // If a variable usable in constant expressions is referenced,
481 // don't warn if it isn't used: if the value of a variable is required
482 // for the computation of a constant expression, it doesn't make sense to
483 // warn even if the variable isn't odr-used. (isReferenced doesn't
484 // precisely reflect that, but it's a decent approximation.)
485 if (VD->isReferenced() &&
486 VD->isUsableInConstantExpressions(SemaRef->Context))
489 // UnusedFileScopedDecls stores the first declaration.
490 // The declaration may have become definition so check again.
491 const VarDecl *DeclToCheck = VD->getDefinition();
493 return !SemaRef->ShouldWarnIfUnusedFileScopedDecl(DeclToCheck);
495 // Later redecls may add new information resulting in not having to warn,
497 DeclToCheck = VD->getMostRecentDecl();
498 if (DeclToCheck != VD)
499 return !SemaRef->ShouldWarnIfUnusedFileScopedDecl(DeclToCheck);
505 /// Obtains a sorted list of functions and variables that are undefined but
507 void Sema::getUndefinedButUsed(
508 SmallVectorImpl<std::pair<NamedDecl *, SourceLocation> > &Undefined) {
509 for (const auto &UndefinedUse : UndefinedButUsed) {
510 NamedDecl *ND = UndefinedUse.first;
512 // Ignore attributes that have become invalid.
513 if (ND->isInvalidDecl()) continue;
515 // __attribute__((weakref)) is basically a definition.
516 if (ND->hasAttr<WeakRefAttr>()) continue;
518 if (FunctionDecl *FD = dyn_cast<FunctionDecl>(ND)) {
521 if (FD->isExternallyVisible() &&
522 !FD->getMostRecentDecl()->isInlined())
525 auto *VD = cast<VarDecl>(ND);
526 if (VD->hasDefinition() != VarDecl::DeclarationOnly)
528 if (VD->isExternallyVisible() && !VD->getMostRecentDecl()->isInline())
532 Undefined.push_back(std::make_pair(ND, UndefinedUse.second));
536 /// checkUndefinedButUsed - Check for undefined objects with internal linkage
537 /// or that are inline.
538 static void checkUndefinedButUsed(Sema &S) {
539 if (S.UndefinedButUsed.empty()) return;
541 // Collect all the still-undefined entities with internal linkage.
542 SmallVector<std::pair<NamedDecl *, SourceLocation>, 16> Undefined;
543 S.getUndefinedButUsed(Undefined);
544 if (Undefined.empty()) return;
546 for (SmallVectorImpl<std::pair<NamedDecl *, SourceLocation> >::iterator
547 I = Undefined.begin(), E = Undefined.end(); I != E; ++I) {
548 NamedDecl *ND = I->first;
550 if (ND->hasAttr<DLLImportAttr>() || ND->hasAttr<DLLExportAttr>()) {
551 // An exported function will always be emitted when defined, so even if
552 // the function is inline, it doesn't have to be emitted in this TU. An
553 // imported function implies that it has been exported somewhere else.
557 if (!ND->isExternallyVisible()) {
558 S.Diag(ND->getLocation(), diag::warn_undefined_internal)
559 << isa<VarDecl>(ND) << ND;
560 } else if (auto *FD = dyn_cast<FunctionDecl>(ND)) {
562 assert(FD->getMostRecentDecl()->isInlined() &&
563 "used object requires definition but isn't inline or internal?");
564 // FIXME: This is ill-formed; we should reject.
565 S.Diag(ND->getLocation(), diag::warn_undefined_inline) << ND;
567 assert(cast<VarDecl>(ND)->getMostRecentDecl()->isInline() &&
568 "used var requires definition but isn't inline or internal?");
569 S.Diag(ND->getLocation(), diag::err_undefined_inline_var) << ND;
571 if (I->second.isValid())
572 S.Diag(I->second, diag::note_used_here);
575 S.UndefinedButUsed.clear();
578 void Sema::LoadExternalWeakUndeclaredIdentifiers() {
582 SmallVector<std::pair<IdentifierInfo *, WeakInfo>, 4> WeakIDs;
583 ExternalSource->ReadWeakUndeclaredIdentifiers(WeakIDs);
584 for (auto &WeakID : WeakIDs)
585 WeakUndeclaredIdentifiers.insert(WeakID);
589 typedef llvm::DenseMap<const CXXRecordDecl*, bool> RecordCompleteMap;
591 /// \brief Returns true, if all methods and nested classes of the given
592 /// CXXRecordDecl are defined in this translation unit.
594 /// Should only be called from ActOnEndOfTranslationUnit so that all
595 /// definitions are actually read.
596 static bool MethodsAndNestedClassesComplete(const CXXRecordDecl *RD,
597 RecordCompleteMap &MNCComplete) {
598 RecordCompleteMap::iterator Cache = MNCComplete.find(RD);
599 if (Cache != MNCComplete.end())
600 return Cache->second;
601 if (!RD->isCompleteDefinition())
603 bool Complete = true;
604 for (DeclContext::decl_iterator I = RD->decls_begin(),
606 I != E && Complete; ++I) {
607 if (const CXXMethodDecl *M = dyn_cast<CXXMethodDecl>(*I))
608 Complete = M->isDefined() || (M->isPure() && !isa<CXXDestructorDecl>(M));
609 else if (const FunctionTemplateDecl *F = dyn_cast<FunctionTemplateDecl>(*I))
610 // If the template function is marked as late template parsed at this
611 // point, it has not been instantiated and therefore we have not
612 // performed semantic analysis on it yet, so we cannot know if the type
613 // can be considered complete.
614 Complete = !F->getTemplatedDecl()->isLateTemplateParsed() &&
615 F->getTemplatedDecl()->isDefined();
616 else if (const CXXRecordDecl *R = dyn_cast<CXXRecordDecl>(*I)) {
617 if (R->isInjectedClassName())
619 if (R->hasDefinition())
620 Complete = MethodsAndNestedClassesComplete(R->getDefinition(),
626 MNCComplete[RD] = Complete;
630 /// \brief Returns true, if the given CXXRecordDecl is fully defined in this
631 /// translation unit, i.e. all methods are defined or pure virtual and all
632 /// friends, friend functions and nested classes are fully defined in this
633 /// translation unit.
635 /// Should only be called from ActOnEndOfTranslationUnit so that all
636 /// definitions are actually read.
637 static bool IsRecordFullyDefined(const CXXRecordDecl *RD,
638 RecordCompleteMap &RecordsComplete,
639 RecordCompleteMap &MNCComplete) {
640 RecordCompleteMap::iterator Cache = RecordsComplete.find(RD);
641 if (Cache != RecordsComplete.end())
642 return Cache->second;
643 bool Complete = MethodsAndNestedClassesComplete(RD, MNCComplete);
644 for (CXXRecordDecl::friend_iterator I = RD->friend_begin(),
645 E = RD->friend_end();
646 I != E && Complete; ++I) {
647 // Check if friend classes and methods are complete.
648 if (TypeSourceInfo *TSI = (*I)->getFriendType()) {
649 // Friend classes are available as the TypeSourceInfo of the FriendDecl.
650 if (CXXRecordDecl *FriendD = TSI->getType()->getAsCXXRecordDecl())
651 Complete = MethodsAndNestedClassesComplete(FriendD, MNCComplete);
655 // Friend functions are available through the NamedDecl of FriendDecl.
656 if (const FunctionDecl *FD =
657 dyn_cast<FunctionDecl>((*I)->getFriendDecl()))
658 Complete = FD->isDefined();
660 // This is a template friend, give up.
664 RecordsComplete[RD] = Complete;
668 void Sema::emitAndClearUnusedLocalTypedefWarnings() {
670 ExternalSource->ReadUnusedLocalTypedefNameCandidates(
671 UnusedLocalTypedefNameCandidates);
672 for (const TypedefNameDecl *TD : UnusedLocalTypedefNameCandidates) {
673 if (TD->isReferenced())
675 Diag(TD->getLocation(), diag::warn_unused_local_typedef)
676 << isa<TypeAliasDecl>(TD) << TD->getDeclName();
678 UnusedLocalTypedefNameCandidates.clear();
681 /// ActOnEndOfTranslationUnit - This is called at the very end of the
682 /// translation unit when EOF is reached and all but the top-level scope is
684 void Sema::ActOnEndOfTranslationUnit() {
685 assert(DelayedDiagnostics.getCurrentPool() == nullptr
686 && "reached end of translation unit with a pool attached?");
688 // If code completion is enabled, don't perform any end-of-translation-unit
690 if (PP.isCodeCompletionEnabled())
693 // Complete translation units and modules define vtables and perform implicit
694 // instantiations. PCH files do not.
695 if (TUKind != TU_Prefix) {
696 DiagnoseUseOfUnimplementedSelectors();
698 // If DefinedUsedVTables ends up marking any virtual member functions it
699 // might lead to more pending template instantiations, which we then need
703 // C++: Perform implicit template instantiations.
705 // FIXME: When we perform these implicit instantiations, we do not
706 // carefully keep track of the point of instantiation (C++ [temp.point]).
707 // This means that name lookup that occurs within the template
708 // instantiation will always happen at the end of the translation unit,
709 // so it will find some names that are not required to be found. This is
710 // valid, but we could do better by diagnosing if an instantiation uses a
711 // name that was not visible at its first point of instantiation.
712 if (ExternalSource) {
713 // Load pending instantiations from the external source.
714 SmallVector<PendingImplicitInstantiation, 4> Pending;
715 ExternalSource->ReadPendingInstantiations(Pending);
716 PendingInstantiations.insert(PendingInstantiations.begin(),
717 Pending.begin(), Pending.end());
719 PerformPendingInstantiations();
721 if (LateTemplateParserCleanup)
722 LateTemplateParserCleanup(OpaqueParser);
724 CheckDelayedMemberExceptionSpecs();
727 DiagnoseUnterminatedPragmaAttribute();
729 // All delayed member exception specs should be checked or we end up accepting
730 // incompatible declarations.
731 // FIXME: This is wrong for TUKind == TU_Prefix. In that case, we need to
732 // write out the lists to the AST file (if any).
733 assert(DelayedDefaultedMemberExceptionSpecs.empty());
734 assert(DelayedExceptionSpecChecks.empty());
736 // All dllexport classes should have been processed already.
737 assert(DelayedDllExportClasses.empty());
739 // Remove file scoped decls that turned out to be used.
740 UnusedFileScopedDecls.erase(
741 std::remove_if(UnusedFileScopedDecls.begin(nullptr, true),
742 UnusedFileScopedDecls.end(),
743 [this](const DeclaratorDecl *DD) {
744 return ShouldRemoveFromUnused(this, DD);
746 UnusedFileScopedDecls.end());
748 if (TUKind == TU_Prefix) {
749 // Translation unit prefixes don't need any of the checking below.
750 if (!PP.isIncrementalProcessingEnabled())
755 // Check for #pragma weak identifiers that were never declared
756 LoadExternalWeakUndeclaredIdentifiers();
757 for (auto WeakID : WeakUndeclaredIdentifiers) {
758 if (WeakID.second.getUsed())
761 Decl *PrevDecl = LookupSingleName(TUScope, WeakID.first, SourceLocation(),
763 if (PrevDecl != nullptr &&
764 !(isa<FunctionDecl>(PrevDecl) || isa<VarDecl>(PrevDecl)))
765 Diag(WeakID.second.getLocation(), diag::warn_attribute_wrong_decl_type)
766 << "'weak'" << ExpectedVariableOrFunction;
768 Diag(WeakID.second.getLocation(), diag::warn_weak_identifier_undeclared)
772 if (LangOpts.CPlusPlus11 &&
773 !Diags.isIgnored(diag::warn_delegating_ctor_cycle, SourceLocation()))
774 CheckDelegatingCtorCycles();
776 if (!Diags.hasErrorOccurred()) {
778 ExternalSource->ReadUndefinedButUsed(UndefinedButUsed);
779 checkUndefinedButUsed(*this);
782 if (TUKind == TU_Module) {
783 // If we are building a module, resolve all of the exported declarations
785 if (Module *CurrentModule = PP.getCurrentModule()) {
786 ModuleMap &ModMap = PP.getHeaderSearchInfo().getModuleMap();
788 SmallVector<Module *, 2> Stack;
789 Stack.push_back(CurrentModule);
790 while (!Stack.empty()) {
791 Module *Mod = Stack.pop_back_val();
793 // Resolve the exported declarations and conflicts.
794 // FIXME: Actually complain, once we figure out how to teach the
795 // diagnostic client to deal with complaints in the module map at this
797 ModMap.resolveExports(Mod, /*Complain=*/false);
798 ModMap.resolveUses(Mod, /*Complain=*/false);
799 ModMap.resolveConflicts(Mod, /*Complain=*/false);
801 // Queue the submodules, so their exports will also be resolved.
802 Stack.append(Mod->submodule_begin(), Mod->submodule_end());
806 // Warnings emitted in ActOnEndOfTranslationUnit() should be emitted for
807 // modules when they are built, not every time they are used.
808 emitAndClearUnusedLocalTypedefWarnings();
810 // Modules don't need any of the checking below.
816 // A declaration of an identifier for an object that has file
817 // scope without an initializer, and without a storage-class
818 // specifier or with the storage-class specifier static,
819 // constitutes a tentative definition. If a translation unit
820 // contains one or more tentative definitions for an identifier,
821 // and the translation unit contains no external definition for
822 // that identifier, then the behavior is exactly as if the
823 // translation unit contains a file scope declaration of that
824 // identifier, with the composite type as of the end of the
825 // translation unit, with an initializer equal to 0.
826 llvm::SmallSet<VarDecl *, 32> Seen;
827 for (TentativeDefinitionsType::iterator
828 T = TentativeDefinitions.begin(ExternalSource),
829 TEnd = TentativeDefinitions.end();
832 VarDecl *VD = (*T)->getActingDefinition();
834 // If the tentative definition was completed, getActingDefinition() returns
835 // null. If we've already seen this variable before, insert()'s second
836 // return value is false.
837 if (!VD || VD->isInvalidDecl() || !Seen.insert(VD).second)
840 if (const IncompleteArrayType *ArrayT
841 = Context.getAsIncompleteArrayType(VD->getType())) {
842 // Set the length of the array to 1 (C99 6.9.2p5).
843 Diag(VD->getLocation(), diag::warn_tentative_incomplete_array);
844 llvm::APInt One(Context.getTypeSize(Context.getSizeType()), true);
845 QualType T = Context.getConstantArrayType(ArrayT->getElementType(),
846 One, ArrayType::Normal, 0);
848 } else if (RequireCompleteType(VD->getLocation(), VD->getType(),
849 diag::err_tentative_def_incomplete_type))
850 VD->setInvalidDecl();
852 // No initialization is performed for a tentative definition.
853 CheckCompleteVariableDeclaration(VD);
855 // Notify the consumer that we've completed a tentative definition.
856 if (!VD->isInvalidDecl())
857 Consumer.CompleteTentativeDefinition(VD);
861 // If there were errors, disable 'unused' warnings since they will mostly be
863 if (!Diags.hasErrorOccurred()) {
864 // Output warning for unused file scoped decls.
865 for (UnusedFileScopedDeclsType::iterator
866 I = UnusedFileScopedDecls.begin(ExternalSource),
867 E = UnusedFileScopedDecls.end(); I != E; ++I) {
868 if (ShouldRemoveFromUnused(this, *I))
871 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(*I)) {
872 const FunctionDecl *DiagD;
873 if (!FD->hasBody(DiagD))
875 if (DiagD->isDeleted())
876 continue; // Deleted functions are supposed to be unused.
877 if (DiagD->isReferenced()) {
878 if (isa<CXXMethodDecl>(DiagD))
879 Diag(DiagD->getLocation(), diag::warn_unneeded_member_function)
880 << DiagD->getDeclName();
882 if (FD->getStorageClass() == SC_Static &&
883 !FD->isInlineSpecified() &&
884 !SourceMgr.isInMainFile(
885 SourceMgr.getExpansionLoc(FD->getLocation())))
886 Diag(DiagD->getLocation(),
887 diag::warn_unneeded_static_internal_decl)
888 << DiagD->getDeclName();
890 Diag(DiagD->getLocation(), diag::warn_unneeded_internal_decl)
891 << /*function*/0 << DiagD->getDeclName();
894 Diag(DiagD->getLocation(),
895 isa<CXXMethodDecl>(DiagD) ? diag::warn_unused_member_function
896 : diag::warn_unused_function)
897 << DiagD->getDeclName();
900 const VarDecl *DiagD = cast<VarDecl>(*I)->getDefinition();
902 DiagD = cast<VarDecl>(*I);
903 if (DiagD->isReferenced()) {
904 Diag(DiagD->getLocation(), diag::warn_unneeded_internal_decl)
905 << /*variable*/1 << DiagD->getDeclName();
906 } else if (DiagD->getType().isConstQualified()) {
907 const SourceManager &SM = SourceMgr;
908 if (SM.getMainFileID() != SM.getFileID(DiagD->getLocation()) ||
909 !PP.getLangOpts().IsHeaderFile)
910 Diag(DiagD->getLocation(), diag::warn_unused_const_variable)
911 << DiagD->getDeclName();
913 Diag(DiagD->getLocation(), diag::warn_unused_variable)
914 << DiagD->getDeclName();
919 emitAndClearUnusedLocalTypedefWarnings();
922 if (!Diags.isIgnored(diag::warn_unused_private_field, SourceLocation())) {
923 RecordCompleteMap RecordsComplete;
924 RecordCompleteMap MNCComplete;
925 for (NamedDeclSetType::iterator I = UnusedPrivateFields.begin(),
926 E = UnusedPrivateFields.end(); I != E; ++I) {
927 const NamedDecl *D = *I;
928 const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(D->getDeclContext());
929 if (RD && !RD->isUnion() &&
930 IsRecordFullyDefined(RD, RecordsComplete, MNCComplete)) {
931 Diag(D->getLocation(), diag::warn_unused_private_field)
937 if (!Diags.isIgnored(diag::warn_mismatched_delete_new, SourceLocation())) {
939 ExternalSource->ReadMismatchingDeleteExpressions(DeleteExprs);
940 for (const auto &DeletedFieldInfo : DeleteExprs) {
941 for (const auto &DeleteExprLoc : DeletedFieldInfo.second) {
942 AnalyzeDeleteExprMismatch(DeletedFieldInfo.first, DeleteExprLoc.first,
943 DeleteExprLoc.second);
948 // Check we've noticed that we're no longer parsing the initializer for every
949 // variable. If we miss cases, then at best we have a performance issue and
950 // at worst a rejects-valid bug.
951 assert(ParsingInitForAutoVars.empty() &&
952 "Didn't unmark var as having its initializer parsed");
954 if (!PP.isIncrementalProcessingEnabled())
959 //===----------------------------------------------------------------------===//
961 //===----------------------------------------------------------------------===//
963 DeclContext *Sema::getFunctionLevelDeclContext() {
964 DeclContext *DC = CurContext;
967 if (isa<BlockDecl>(DC) || isa<EnumDecl>(DC) || isa<CapturedDecl>(DC)) {
968 DC = DC->getParent();
969 } else if (isa<CXXMethodDecl>(DC) &&
970 cast<CXXMethodDecl>(DC)->getOverloadedOperator() == OO_Call &&
971 cast<CXXRecordDecl>(DC->getParent())->isLambda()) {
972 DC = DC->getParent()->getParent();
980 /// getCurFunctionDecl - If inside of a function body, this returns a pointer
981 /// to the function decl for the function being parsed. If we're currently
982 /// in a 'block', this returns the containing context.
983 FunctionDecl *Sema::getCurFunctionDecl() {
984 DeclContext *DC = getFunctionLevelDeclContext();
985 return dyn_cast<FunctionDecl>(DC);
988 ObjCMethodDecl *Sema::getCurMethodDecl() {
989 DeclContext *DC = getFunctionLevelDeclContext();
990 while (isa<RecordDecl>(DC))
991 DC = DC->getParent();
992 return dyn_cast<ObjCMethodDecl>(DC);
995 NamedDecl *Sema::getCurFunctionOrMethodDecl() {
996 DeclContext *DC = getFunctionLevelDeclContext();
997 if (isa<ObjCMethodDecl>(DC) || isa<FunctionDecl>(DC))
998 return cast<NamedDecl>(DC);
1002 void Sema::EmitCurrentDiagnostic(unsigned DiagID) {
1003 // FIXME: It doesn't make sense to me that DiagID is an incoming argument here
1004 // and yet we also use the current diag ID on the DiagnosticsEngine. This has
1005 // been made more painfully obvious by the refactor that introduced this
1006 // function, but it is possible that the incoming argument can be
1007 // eliminated. If it truly cannot be (for example, there is some reentrancy
1008 // issue I am not seeing yet), then there should at least be a clarifying
1009 // comment somewhere.
1010 if (Optional<TemplateDeductionInfo*> Info = isSFINAEContext()) {
1011 switch (DiagnosticIDs::getDiagnosticSFINAEResponse(
1012 Diags.getCurrentDiagID())) {
1013 case DiagnosticIDs::SFINAE_Report:
1014 // We'll report the diagnostic below.
1017 case DiagnosticIDs::SFINAE_SubstitutionFailure:
1018 // Count this failure so that we know that template argument deduction
1022 // Make a copy of this suppressed diagnostic and store it with the
1023 // template-deduction information.
1024 if (*Info && !(*Info)->hasSFINAEDiagnostic()) {
1025 Diagnostic DiagInfo(&Diags);
1026 (*Info)->addSFINAEDiagnostic(DiagInfo.getLocation(),
1027 PartialDiagnostic(DiagInfo, Context.getDiagAllocator()));
1030 Diags.setLastDiagnosticIgnored();
1034 case DiagnosticIDs::SFINAE_AccessControl: {
1035 // Per C++ Core Issue 1170, access control is part of SFINAE.
1036 // Additionally, the AccessCheckingSFINAE flag can be used to temporarily
1037 // make access control a part of SFINAE for the purposes of checking
1039 if (!AccessCheckingSFINAE && !getLangOpts().CPlusPlus11)
1042 SourceLocation Loc = Diags.getCurrentDiagLoc();
1044 // Suppress this diagnostic.
1047 // Make a copy of this suppressed diagnostic and store it with the
1048 // template-deduction information.
1049 if (*Info && !(*Info)->hasSFINAEDiagnostic()) {
1050 Diagnostic DiagInfo(&Diags);
1051 (*Info)->addSFINAEDiagnostic(DiagInfo.getLocation(),
1052 PartialDiagnostic(DiagInfo, Context.getDiagAllocator()));
1055 Diags.setLastDiagnosticIgnored();
1058 // Now the diagnostic state is clear, produce a C++98 compatibility
1060 Diag(Loc, diag::warn_cxx98_compat_sfinae_access_control);
1062 // The last diagnostic which Sema produced was ignored. Suppress any
1063 // notes attached to it.
1064 Diags.setLastDiagnosticIgnored();
1068 case DiagnosticIDs::SFINAE_Suppress:
1069 // Make a copy of this suppressed diagnostic and store it with the
1070 // template-deduction information;
1072 Diagnostic DiagInfo(&Diags);
1073 (*Info)->addSuppressedDiagnostic(DiagInfo.getLocation(),
1074 PartialDiagnostic(DiagInfo, Context.getDiagAllocator()));
1077 // Suppress this diagnostic.
1078 Diags.setLastDiagnosticIgnored();
1084 // Set up the context's printing policy based on our current state.
1085 Context.setPrintingPolicy(getPrintingPolicy());
1087 // Emit the diagnostic.
1088 if (!Diags.EmitCurrentDiagnostic())
1091 // If this is not a note, and we're in a template instantiation
1092 // that is different from the last template instantiation where
1093 // we emitted an error, print a template instantiation
1095 if (!DiagnosticIDs::isBuiltinNote(DiagID))
1096 PrintContextStack();
1099 Sema::SemaDiagnosticBuilder
1100 Sema::Diag(SourceLocation Loc, const PartialDiagnostic& PD) {
1101 SemaDiagnosticBuilder Builder(Diag(Loc, PD.getDiagID()));
1107 /// \brief Looks through the macro-expansion chain for the given
1108 /// location, looking for a macro expansion with the given name.
1109 /// If one is found, returns true and sets the location to that
1111 bool Sema::findMacroSpelling(SourceLocation &locref, StringRef name) {
1112 SourceLocation loc = locref;
1113 if (!loc.isMacroID()) return false;
1115 // There's no good way right now to look at the intermediate
1116 // expansions, so just jump to the expansion location.
1117 loc = getSourceManager().getExpansionLoc(loc);
1119 // If that's written with the name, stop here.
1120 SmallVector<char, 16> buffer;
1121 if (getPreprocessor().getSpelling(loc, buffer) == name) {
1128 /// \brief Determines the active Scope associated with the given declaration
1131 /// This routine maps a declaration context to the active Scope object that
1132 /// represents that declaration context in the parser. It is typically used
1133 /// from "scope-less" code (e.g., template instantiation, lazy creation of
1134 /// declarations) that injects a name for name-lookup purposes and, therefore,
1135 /// must update the Scope.
1137 /// \returns The scope corresponding to the given declaraion context, or NULL
1138 /// if no such scope is open.
1139 Scope *Sema::getScopeForContext(DeclContext *Ctx) {
1144 Ctx = Ctx->getPrimaryContext();
1145 for (Scope *S = getCurScope(); S; S = S->getParent()) {
1146 // Ignore scopes that cannot have declarations. This is important for
1147 // out-of-line definitions of static class members.
1148 if (S->getFlags() & (Scope::DeclScope | Scope::TemplateParamScope))
1149 if (DeclContext *Entity = S->getEntity())
1150 if (Ctx == Entity->getPrimaryContext())
1157 /// \brief Enter a new function scope
1158 void Sema::PushFunctionScope() {
1159 if (FunctionScopes.size() == 1) {
1160 // Use the "top" function scope rather than having to allocate
1161 // memory for a new scope.
1162 FunctionScopes.back()->Clear();
1163 FunctionScopes.push_back(FunctionScopes.back());
1167 FunctionScopes.push_back(new FunctionScopeInfo(getDiagnostics()));
1170 void Sema::PushBlockScope(Scope *BlockScope, BlockDecl *Block) {
1171 FunctionScopes.push_back(new BlockScopeInfo(getDiagnostics(),
1172 BlockScope, Block));
1175 LambdaScopeInfo *Sema::PushLambdaScope() {
1176 LambdaScopeInfo *const LSI = new LambdaScopeInfo(getDiagnostics());
1177 FunctionScopes.push_back(LSI);
1181 void Sema::RecordParsingTemplateParameterDepth(unsigned Depth) {
1182 if (LambdaScopeInfo *const LSI = getCurLambda()) {
1183 LSI->AutoTemplateParameterDepth = Depth;
1187 "Remove assertion if intentionally called in a non-lambda context.");
1190 void Sema::PopFunctionScopeInfo(const AnalysisBasedWarnings::Policy *WP,
1191 const Decl *D, const BlockExpr *blkExpr) {
1192 FunctionScopeInfo *Scope = FunctionScopes.pop_back_val();
1193 assert(!FunctionScopes.empty() && "mismatched push/pop!");
1195 // Issue any analysis-based warnings.
1197 AnalysisWarnings.IssueWarnings(*WP, Scope, D, blkExpr);
1199 for (const auto &PUD : Scope->PossiblyUnreachableDiags)
1200 Diag(PUD.Loc, PUD.PD);
1202 if (FunctionScopes.back() != Scope)
1206 void Sema::PushCompoundScope() {
1207 getCurFunction()->CompoundScopes.push_back(CompoundScopeInfo());
1210 void Sema::PopCompoundScope() {
1211 FunctionScopeInfo *CurFunction = getCurFunction();
1212 assert(!CurFunction->CompoundScopes.empty() && "mismatched push/pop");
1214 CurFunction->CompoundScopes.pop_back();
1217 /// \brief Determine whether any errors occurred within this function/method/
1219 bool Sema::hasAnyUnrecoverableErrorsInThisFunction() const {
1220 return getCurFunction()->ErrorTrap.hasUnrecoverableErrorOccurred();
1223 BlockScopeInfo *Sema::getCurBlock() {
1224 if (FunctionScopes.empty())
1227 auto CurBSI = dyn_cast<BlockScopeInfo>(FunctionScopes.back());
1228 if (CurBSI && CurBSI->TheDecl &&
1229 !CurBSI->TheDecl->Encloses(CurContext)) {
1230 // We have switched contexts due to template instantiation.
1231 assert(!CodeSynthesisContexts.empty());
1238 LambdaScopeInfo *Sema::getCurLambda(bool IgnoreNonLambdaCapturingScope) {
1239 if (FunctionScopes.empty())
1242 auto I = FunctionScopes.rbegin();
1243 if (IgnoreNonLambdaCapturingScope) {
1244 auto E = FunctionScopes.rend();
1245 while (I != E && isa<CapturingScopeInfo>(*I) && !isa<LambdaScopeInfo>(*I))
1250 auto *CurLSI = dyn_cast<LambdaScopeInfo>(*I);
1251 if (CurLSI && CurLSI->Lambda &&
1252 !CurLSI->Lambda->Encloses(CurContext)) {
1253 // We have switched contexts due to template instantiation.
1254 assert(!CodeSynthesisContexts.empty());
1260 // We have a generic lambda if we parsed auto parameters, or we have
1261 // an associated template parameter list.
1262 LambdaScopeInfo *Sema::getCurGenericLambda() {
1263 if (LambdaScopeInfo *LSI = getCurLambda()) {
1264 return (LSI->AutoTemplateParams.size() ||
1265 LSI->GLTemplateParameterList) ? LSI : nullptr;
1271 void Sema::ActOnComment(SourceRange Comment) {
1272 if (!LangOpts.RetainCommentsFromSystemHeaders &&
1273 SourceMgr.isInSystemHeader(Comment.getBegin()))
1275 RawComment RC(SourceMgr, Comment, false,
1276 LangOpts.CommentOpts.ParseAllComments);
1277 if (RC.isAlmostTrailingComment()) {
1278 SourceRange MagicMarkerRange(Comment.getBegin(),
1279 Comment.getBegin().getLocWithOffset(3));
1280 StringRef MagicMarkerText;
1281 switch (RC.getKind()) {
1282 case RawComment::RCK_OrdinaryBCPL:
1283 MagicMarkerText = "///<";
1285 case RawComment::RCK_OrdinaryC:
1286 MagicMarkerText = "/**<";
1289 llvm_unreachable("if this is an almost Doxygen comment, "
1290 "it should be ordinary");
1292 Diag(Comment.getBegin(), diag::warn_not_a_doxygen_trailing_member_comment) <<
1293 FixItHint::CreateReplacement(MagicMarkerRange, MagicMarkerText);
1295 Context.addComment(RC);
1298 // Pin this vtable to this file.
1299 ExternalSemaSource::~ExternalSemaSource() {}
1301 void ExternalSemaSource::ReadMethodPool(Selector Sel) { }
1302 void ExternalSemaSource::updateOutOfDateSelector(Selector Sel) { }
1304 void ExternalSemaSource::ReadKnownNamespaces(
1305 SmallVectorImpl<NamespaceDecl *> &Namespaces) {
1308 void ExternalSemaSource::ReadUndefinedButUsed(
1309 llvm::MapVector<NamedDecl *, SourceLocation> &Undefined) {}
1311 void ExternalSemaSource::ReadMismatchingDeleteExpressions(llvm::MapVector<
1312 FieldDecl *, llvm::SmallVector<std::pair<SourceLocation, bool>, 4>> &) {}
1314 void PrettyDeclStackTraceEntry::print(raw_ostream &OS) const {
1315 SourceLocation Loc = this->Loc;
1316 if (!Loc.isValid() && TheDecl) Loc = TheDecl->getLocation();
1317 if (Loc.isValid()) {
1318 Loc.print(OS, S.getSourceManager());
1323 if (auto *ND = dyn_cast_or_null<NamedDecl>(TheDecl)) {
1325 ND->getNameForDiagnostic(OS, ND->getASTContext().getPrintingPolicy(), true);
1332 /// \brief Figure out if an expression could be turned into a call.
1334 /// Use this when trying to recover from an error where the programmer may have
1335 /// written just the name of a function instead of actually calling it.
1337 /// \param E - The expression to examine.
1338 /// \param ZeroArgCallReturnTy - If the expression can be turned into a call
1339 /// with no arguments, this parameter is set to the type returned by such a
1340 /// call; otherwise, it is set to an empty QualType.
1341 /// \param OverloadSet - If the expression is an overloaded function
1342 /// name, this parameter is populated with the decls of the various overloads.
1343 bool Sema::tryExprAsCall(Expr &E, QualType &ZeroArgCallReturnTy,
1344 UnresolvedSetImpl &OverloadSet) {
1345 ZeroArgCallReturnTy = QualType();
1346 OverloadSet.clear();
1348 const OverloadExpr *Overloads = nullptr;
1349 bool IsMemExpr = false;
1350 if (E.getType() == Context.OverloadTy) {
1351 OverloadExpr::FindResult FR = OverloadExpr::find(const_cast<Expr*>(&E));
1353 // Ignore overloads that are pointer-to-member constants.
1354 if (FR.HasFormOfMemberPointer)
1357 Overloads = FR.Expression;
1358 } else if (E.getType() == Context.BoundMemberTy) {
1359 Overloads = dyn_cast<UnresolvedMemberExpr>(E.IgnoreParens());
1363 bool Ambiguous = false;
1366 for (OverloadExpr::decls_iterator it = Overloads->decls_begin(),
1367 DeclsEnd = Overloads->decls_end(); it != DeclsEnd; ++it) {
1368 OverloadSet.addDecl(*it);
1370 // Check whether the function is a non-template, non-member which takes no
1374 if (const FunctionDecl *OverloadDecl
1375 = dyn_cast<FunctionDecl>((*it)->getUnderlyingDecl())) {
1376 if (OverloadDecl->getMinRequiredArguments() == 0) {
1377 if (!ZeroArgCallReturnTy.isNull() && !Ambiguous) {
1378 ZeroArgCallReturnTy = QualType();
1381 ZeroArgCallReturnTy = OverloadDecl->getReturnType();
1386 // If it's not a member, use better machinery to try to resolve the call
1388 return !ZeroArgCallReturnTy.isNull();
1391 // Attempt to call the member with no arguments - this will correctly handle
1392 // member templates with defaults/deduction of template arguments, overloads
1393 // with default arguments, etc.
1394 if (IsMemExpr && !E.isTypeDependent()) {
1395 bool Suppress = getDiagnostics().getSuppressAllDiagnostics();
1396 getDiagnostics().setSuppressAllDiagnostics(true);
1397 ExprResult R = BuildCallToMemberFunction(nullptr, &E, SourceLocation(),
1398 None, SourceLocation());
1399 getDiagnostics().setSuppressAllDiagnostics(Suppress);
1401 ZeroArgCallReturnTy = R.get()->getType();
1407 if (const DeclRefExpr *DeclRef = dyn_cast<DeclRefExpr>(E.IgnoreParens())) {
1408 if (const FunctionDecl *Fun = dyn_cast<FunctionDecl>(DeclRef->getDecl())) {
1409 if (Fun->getMinRequiredArguments() == 0)
1410 ZeroArgCallReturnTy = Fun->getReturnType();
1415 // We don't have an expression that's convenient to get a FunctionDecl from,
1416 // but we can at least check if the type is "function of 0 arguments".
1417 QualType ExprTy = E.getType();
1418 const FunctionType *FunTy = nullptr;
1419 QualType PointeeTy = ExprTy->getPointeeType();
1420 if (!PointeeTy.isNull())
1421 FunTy = PointeeTy->getAs<FunctionType>();
1423 FunTy = ExprTy->getAs<FunctionType>();
1425 if (const FunctionProtoType *FPT =
1426 dyn_cast_or_null<FunctionProtoType>(FunTy)) {
1427 if (FPT->getNumParams() == 0)
1428 ZeroArgCallReturnTy = FunTy->getReturnType();
1434 /// \brief Give notes for a set of overloads.
1436 /// A companion to tryExprAsCall. In cases when the name that the programmer
1437 /// wrote was an overloaded function, we may be able to make some guesses about
1438 /// plausible overloads based on their return types; such guesses can be handed
1439 /// off to this method to be emitted as notes.
1441 /// \param Overloads - The overloads to note.
1442 /// \param FinalNoteLoc - If we've suppressed printing some overloads due to
1443 /// -fshow-overloads=best, this is the location to attach to the note about too
1444 /// many candidates. Typically this will be the location of the original
1445 /// ill-formed expression.
1446 static void noteOverloads(Sema &S, const UnresolvedSetImpl &Overloads,
1447 const SourceLocation FinalNoteLoc) {
1448 int ShownOverloads = 0;
1449 int SuppressedOverloads = 0;
1450 for (UnresolvedSetImpl::iterator It = Overloads.begin(),
1451 DeclsEnd = Overloads.end(); It != DeclsEnd; ++It) {
1452 // FIXME: Magic number for max shown overloads stolen from
1453 // OverloadCandidateSet::NoteCandidates.
1454 if (ShownOverloads >= 4 && S.Diags.getShowOverloads() == Ovl_Best) {
1455 ++SuppressedOverloads;
1459 NamedDecl *Fn = (*It)->getUnderlyingDecl();
1460 S.Diag(Fn->getLocation(), diag::note_possible_target_of_call);
1464 if (SuppressedOverloads)
1465 S.Diag(FinalNoteLoc, diag::note_ovl_too_many_candidates)
1466 << SuppressedOverloads;
1469 static void notePlausibleOverloads(Sema &S, SourceLocation Loc,
1470 const UnresolvedSetImpl &Overloads,
1471 bool (*IsPlausibleResult)(QualType)) {
1472 if (!IsPlausibleResult)
1473 return noteOverloads(S, Overloads, Loc);
1475 UnresolvedSet<2> PlausibleOverloads;
1476 for (OverloadExpr::decls_iterator It = Overloads.begin(),
1477 DeclsEnd = Overloads.end(); It != DeclsEnd; ++It) {
1478 const FunctionDecl *OverloadDecl = cast<FunctionDecl>(*It);
1479 QualType OverloadResultTy = OverloadDecl->getReturnType();
1480 if (IsPlausibleResult(OverloadResultTy))
1481 PlausibleOverloads.addDecl(It.getDecl());
1483 noteOverloads(S, PlausibleOverloads, Loc);
1486 /// Determine whether the given expression can be called by just
1487 /// putting parentheses after it. Notably, expressions with unary
1488 /// operators can't be because the unary operator will start parsing
1489 /// outside the call.
1490 static bool IsCallableWithAppend(Expr *E) {
1491 E = E->IgnoreImplicit();
1492 return (!isa<CStyleCastExpr>(E) &&
1493 !isa<UnaryOperator>(E) &&
1494 !isa<BinaryOperator>(E) &&
1495 !isa<CXXOperatorCallExpr>(E));
1498 bool Sema::tryToRecoverWithCall(ExprResult &E, const PartialDiagnostic &PD,
1500 bool (*IsPlausibleResult)(QualType)) {
1501 SourceLocation Loc = E.get()->getExprLoc();
1502 SourceRange Range = E.get()->getSourceRange();
1504 QualType ZeroArgCallTy;
1505 UnresolvedSet<4> Overloads;
1506 if (tryExprAsCall(*E.get(), ZeroArgCallTy, Overloads) &&
1507 !ZeroArgCallTy.isNull() &&
1508 (!IsPlausibleResult || IsPlausibleResult(ZeroArgCallTy))) {
1509 // At this point, we know E is potentially callable with 0
1510 // arguments and that it returns something of a reasonable type,
1511 // so we can emit a fixit and carry on pretending that E was
1512 // actually a CallExpr.
1513 SourceLocation ParenInsertionLoc = getLocForEndOfToken(Range.getEnd());
1515 << /*zero-arg*/ 1 << Range
1516 << (IsCallableWithAppend(E.get())
1517 ? FixItHint::CreateInsertion(ParenInsertionLoc, "()")
1519 notePlausibleOverloads(*this, Loc, Overloads, IsPlausibleResult);
1521 // FIXME: Try this before emitting the fixit, and suppress diagnostics
1523 E = ActOnCallExpr(nullptr, E.get(), Range.getEnd(), None,
1524 Range.getEnd().getLocWithOffset(1));
1528 if (!ForceComplain) return false;
1530 Diag(Loc, PD) << /*not zero-arg*/ 0 << Range;
1531 notePlausibleOverloads(*this, Loc, Overloads, IsPlausibleResult);
1536 IdentifierInfo *Sema::getSuperIdentifier() const {
1538 Ident_super = &Context.Idents.get("super");
1542 IdentifierInfo *Sema::getFloat128Identifier() const {
1543 if (!Ident___float128)
1544 Ident___float128 = &Context.Idents.get("__float128");
1545 return Ident___float128;
1548 void Sema::PushCapturedRegionScope(Scope *S, CapturedDecl *CD, RecordDecl *RD,
1549 CapturedRegionKind K) {
1550 CapturingScopeInfo *CSI = new CapturedRegionScopeInfo(
1551 getDiagnostics(), S, CD, RD, CD->getContextParam(), K,
1552 (getLangOpts().OpenMP && K == CR_OpenMP) ? getOpenMPNestingLevel() : 0);
1553 CSI->ReturnType = Context.VoidTy;
1554 FunctionScopes.push_back(CSI);
1557 CapturedRegionScopeInfo *Sema::getCurCapturedRegion() {
1558 if (FunctionScopes.empty())
1561 return dyn_cast<CapturedRegionScopeInfo>(FunctionScopes.back());
1564 const llvm::MapVector<FieldDecl *, Sema::DeleteLocs> &
1565 Sema::getMismatchingDeleteExpressions() const {
1569 void Sema::setOpenCLExtensionForType(QualType T, llvm::StringRef ExtStr) {
1572 llvm::SmallVector<StringRef, 1> Exts;
1573 ExtStr.split(Exts, " ", /* limit */ -1, /* keep empty */ false);
1574 auto CanT = T.getCanonicalType().getTypePtr();
1575 for (auto &I : Exts)
1576 OpenCLTypeExtMap[CanT].insert(I.str());
1579 void Sema::setOpenCLExtensionForDecl(Decl *FD, StringRef ExtStr) {
1580 llvm::SmallVector<StringRef, 1> Exts;
1581 ExtStr.split(Exts, " ", /* limit */ -1, /* keep empty */ false);
1584 for (auto &I : Exts)
1585 OpenCLDeclExtMap[FD].insert(I.str());
1588 void Sema::setCurrentOpenCLExtensionForType(QualType T) {
1589 if (CurrOpenCLExtension.empty())
1591 setOpenCLExtensionForType(T, CurrOpenCLExtension);
1594 void Sema::setCurrentOpenCLExtensionForDecl(Decl *D) {
1595 if (CurrOpenCLExtension.empty())
1597 setOpenCLExtensionForDecl(D, CurrOpenCLExtension);
1600 bool Sema::isOpenCLDisabledDecl(Decl *FD) {
1601 auto Loc = OpenCLDeclExtMap.find(FD);
1602 if (Loc == OpenCLDeclExtMap.end())
1604 for (auto &I : Loc->second) {
1605 if (!getOpenCLOptions().isEnabled(I))
1611 template <typename T, typename DiagLocT, typename DiagInfoT, typename MapT>
1612 bool Sema::checkOpenCLDisabledTypeOrDecl(T D, DiagLocT DiagLoc,
1613 DiagInfoT DiagInfo, MapT &Map,
1615 SourceRange SrcRange) {
1616 auto Loc = Map.find(D);
1617 if (Loc == Map.end())
1619 bool Disabled = false;
1620 for (auto &I : Loc->second) {
1621 if (I != CurrOpenCLExtension && !getOpenCLOptions().isEnabled(I)) {
1622 Diag(DiagLoc, diag::err_opencl_requires_extension) << Selector << DiagInfo
1630 bool Sema::checkOpenCLDisabledTypeDeclSpec(const DeclSpec &DS, QualType QT) {
1631 // Check extensions for declared types.
1632 Decl *Decl = nullptr;
1633 if (auto TypedefT = dyn_cast<TypedefType>(QT.getTypePtr()))
1634 Decl = TypedefT->getDecl();
1635 if (auto TagT = dyn_cast<TagType>(QT.getCanonicalType().getTypePtr()))
1636 Decl = TagT->getDecl();
1637 auto Loc = DS.getTypeSpecTypeLoc();
1638 if (checkOpenCLDisabledTypeOrDecl(Decl, Loc, QT, OpenCLDeclExtMap))
1641 // Check extensions for builtin types.
1642 return checkOpenCLDisabledTypeOrDecl(QT.getCanonicalType().getTypePtr(), Loc,
1643 QT, OpenCLTypeExtMap);
1646 bool Sema::checkOpenCLDisabledDecl(const Decl &D, const Expr &E) {
1647 return checkOpenCLDisabledTypeOrDecl(&D, E.getLocStart(), "",
1648 OpenCLDeclExtMap, 1, D.getSourceRange());