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,
75 CodeCompleteConsumer *CodeCompleter)
76 : ExternalSource(nullptr),
77 isMultiplexExternalSource(false), FPFeatures(pp.getLangOpts()),
78 LangOpts(pp.getLangOpts()), PP(pp), Context(ctxt), Consumer(consumer),
79 Diags(PP.getDiagnostics()), SourceMgr(PP.getSourceManager()),
80 CollectStats(false), CodeCompleter(CodeCompleter),
81 CurContext(nullptr), OriginalLexicalContext(nullptr),
82 MSStructPragmaOn(false),
83 MSPointerToMemberRepresentationMethod(
84 LangOpts.getMSPointerToMemberRepresentationMethod()),
85 VtorDispStack(MSVtorDispAttr::Mode(LangOpts.VtorDispMode)),
86 PackStack(0), DataSegStack(nullptr), BSSSegStack(nullptr),
87 ConstSegStack(nullptr), CodeSegStack(nullptr), CurInitSeg(nullptr),
89 IsBuildingRecoveryCallExpr(false),
90 Cleanup{}, LateTemplateParser(nullptr),
91 LateTemplateParserCleanup(nullptr), OpaqueParser(nullptr), IdResolver(pp),
92 StdExperimentalNamespaceCache(nullptr), StdInitializerList(nullptr),
93 CXXTypeInfoDecl(nullptr), MSVCGuidDecl(nullptr),
94 NSNumberDecl(nullptr), NSValueDecl(nullptr),
95 NSStringDecl(nullptr), StringWithUTF8StringMethod(nullptr),
96 ValueWithBytesObjCTypeMethod(nullptr),
97 NSArrayDecl(nullptr), ArrayWithObjectsMethod(nullptr),
98 NSDictionaryDecl(nullptr), DictionaryWithObjectsMethod(nullptr),
99 GlobalNewDeleteDeclared(false),
102 CachedFakeTopLevelModule(nullptr),
103 AccessCheckingSFINAE(false), InNonInstantiationSFINAEContext(false),
104 NonInstantiationEntries(0), ArgumentPackSubstitutionIndex(-1),
105 CurrentInstantiationScope(nullptr), DisableTypoCorrection(false),
106 TyposCorrected(0), AnalysisWarnings(*this), ThreadSafetyDeclCache(nullptr),
107 VarDataSharingAttributesStack(nullptr), CurScope(nullptr),
108 Ident_super(nullptr), Ident___float128(nullptr)
112 LoadedExternalKnownNamespaces = false;
113 for (unsigned I = 0; I != NSAPI::NumNSNumberLiteralMethods; ++I)
114 NSNumberLiteralMethods[I] = nullptr;
116 if (getLangOpts().ObjC1)
117 NSAPIObj.reset(new NSAPI(Context));
119 if (getLangOpts().CPlusPlus)
120 FieldCollector.reset(new CXXFieldCollector());
122 // Tell diagnostics how to render things from the AST library.
123 Diags.SetArgToStringFn(&FormatASTNodeDiagnosticArgument, &Context);
125 ExprEvalContexts.emplace_back(PotentiallyEvaluated, 0, CleanupInfo{}, nullptr,
128 FunctionScopes.push_back(new FunctionScopeInfo(Diags));
130 // Initilization of data sharing attributes stack for OpenMP
131 InitDataSharingAttributesStack();
134 void Sema::addImplicitTypedef(StringRef Name, QualType T) {
135 DeclarationName DN = &Context.Idents.get(Name);
136 if (IdResolver.begin(DN) == IdResolver.end())
137 PushOnScopeChains(Context.buildImplicitTypedef(T, Name), TUScope);
140 void Sema::Initialize() {
141 if (SemaConsumer *SC = dyn_cast<SemaConsumer>(&Consumer))
142 SC->InitializeSema(*this);
144 // Tell the external Sema source about this Sema object.
145 if (ExternalSemaSource *ExternalSema
146 = dyn_cast_or_null<ExternalSemaSource>(Context.getExternalSource()))
147 ExternalSema->InitializeSema(*this);
149 // This needs to happen after ExternalSemaSource::InitializeSema(this) or we
150 // will not be able to merge any duplicate __va_list_tag decls correctly.
151 VAListTagName = PP.getIdentifierInfo("__va_list_tag");
156 // Initialize predefined 128-bit integer types, if needed.
157 if (Context.getTargetInfo().hasInt128Type()) {
158 // If either of the 128-bit integer types are unavailable to name lookup,
160 DeclarationName Int128 = &Context.Idents.get("__int128_t");
161 if (IdResolver.begin(Int128) == IdResolver.end())
162 PushOnScopeChains(Context.getInt128Decl(), TUScope);
164 DeclarationName UInt128 = &Context.Idents.get("__uint128_t");
165 if (IdResolver.begin(UInt128) == IdResolver.end())
166 PushOnScopeChains(Context.getUInt128Decl(), TUScope);
170 // Initialize predefined Objective-C types:
171 if (getLangOpts().ObjC1) {
172 // If 'SEL' does not yet refer to any declarations, make it refer to the
174 DeclarationName SEL = &Context.Idents.get("SEL");
175 if (IdResolver.begin(SEL) == IdResolver.end())
176 PushOnScopeChains(Context.getObjCSelDecl(), TUScope);
178 // If 'id' does not yet refer to any declarations, make it refer to the
180 DeclarationName Id = &Context.Idents.get("id");
181 if (IdResolver.begin(Id) == IdResolver.end())
182 PushOnScopeChains(Context.getObjCIdDecl(), TUScope);
184 // Create the built-in typedef for 'Class'.
185 DeclarationName Class = &Context.Idents.get("Class");
186 if (IdResolver.begin(Class) == IdResolver.end())
187 PushOnScopeChains(Context.getObjCClassDecl(), TUScope);
189 // Create the built-in forward declaratino for 'Protocol'.
190 DeclarationName Protocol = &Context.Idents.get("Protocol");
191 if (IdResolver.begin(Protocol) == IdResolver.end())
192 PushOnScopeChains(Context.getObjCProtocolDecl(), TUScope);
195 // Create the internal type for the *StringMakeConstantString builtins.
196 DeclarationName ConstantString = &Context.Idents.get("__NSConstantString");
197 if (IdResolver.begin(ConstantString) == IdResolver.end())
198 PushOnScopeChains(Context.getCFConstantStringDecl(), TUScope);
200 // Initialize Microsoft "predefined C++ types".
201 if (getLangOpts().MSVCCompat) {
202 if (getLangOpts().CPlusPlus &&
203 IdResolver.begin(&Context.Idents.get("type_info")) == IdResolver.end())
204 PushOnScopeChains(Context.buildImplicitRecord("type_info", TTK_Class),
207 addImplicitTypedef("size_t", Context.getSizeType());
210 // Initialize predefined OpenCL types and supported extensions and (optional)
212 if (getLangOpts().OpenCL) {
213 getOpenCLOptions().addSupport(Context.getTargetInfo().getSupportedOpenCLOpts());
214 getOpenCLOptions().enableSupportedCore(getLangOpts().OpenCLVersion);
215 addImplicitTypedef("sampler_t", Context.OCLSamplerTy);
216 addImplicitTypedef("event_t", Context.OCLEventTy);
217 if (getLangOpts().OpenCLVersion >= 200) {
218 addImplicitTypedef("clk_event_t", Context.OCLClkEventTy);
219 addImplicitTypedef("queue_t", Context.OCLQueueTy);
220 addImplicitTypedef("ndrange_t", Context.OCLNDRangeTy);
221 addImplicitTypedef("reserve_id_t", Context.OCLReserveIDTy);
222 addImplicitTypedef("atomic_int", Context.getAtomicType(Context.IntTy));
223 addImplicitTypedef("atomic_uint",
224 Context.getAtomicType(Context.UnsignedIntTy));
225 auto AtomicLongT = Context.getAtomicType(Context.LongTy);
226 addImplicitTypedef("atomic_long", AtomicLongT);
227 auto AtomicULongT = Context.getAtomicType(Context.UnsignedLongTy);
228 addImplicitTypedef("atomic_ulong", AtomicULongT);
229 addImplicitTypedef("atomic_float",
230 Context.getAtomicType(Context.FloatTy));
231 auto AtomicDoubleT = Context.getAtomicType(Context.DoubleTy);
232 addImplicitTypedef("atomic_double", AtomicDoubleT);
233 // OpenCLC v2.0, s6.13.11.6 requires that atomic_flag is implemented as
234 // 32-bit integer and OpenCLC v2.0, s6.1.1 int is always 32-bit wide.
235 addImplicitTypedef("atomic_flag", Context.getAtomicType(Context.IntTy));
236 auto AtomicIntPtrT = Context.getAtomicType(Context.getIntPtrType());
237 addImplicitTypedef("atomic_intptr_t", AtomicIntPtrT);
238 auto AtomicUIntPtrT = Context.getAtomicType(Context.getUIntPtrType());
239 addImplicitTypedef("atomic_uintptr_t", AtomicUIntPtrT);
240 auto AtomicSizeT = Context.getAtomicType(Context.getSizeType());
241 addImplicitTypedef("atomic_size_t", AtomicSizeT);
242 auto AtomicPtrDiffT = Context.getAtomicType(Context.getPointerDiffType());
243 addImplicitTypedef("atomic_ptrdiff_t", AtomicPtrDiffT);
245 // OpenCL v2.0 s6.13.11.6:
246 // - The atomic_long and atomic_ulong types are supported if the
247 // cl_khr_int64_base_atomics and cl_khr_int64_extended_atomics
248 // extensions are supported.
249 // - The atomic_double type is only supported if double precision
250 // is supported and the cl_khr_int64_base_atomics and
251 // cl_khr_int64_extended_atomics extensions are supported.
252 // - If the device address space is 64-bits, the data types
253 // atomic_intptr_t, atomic_uintptr_t, atomic_size_t and
254 // atomic_ptrdiff_t are supported if the cl_khr_int64_base_atomics and
255 // cl_khr_int64_extended_atomics extensions are supported.
256 std::vector<QualType> Atomic64BitTypes;
257 Atomic64BitTypes.push_back(AtomicLongT);
258 Atomic64BitTypes.push_back(AtomicULongT);
259 Atomic64BitTypes.push_back(AtomicDoubleT);
260 if (Context.getTypeSize(AtomicSizeT) == 64) {
261 Atomic64BitTypes.push_back(AtomicSizeT);
262 Atomic64BitTypes.push_back(AtomicIntPtrT);
263 Atomic64BitTypes.push_back(AtomicUIntPtrT);
264 Atomic64BitTypes.push_back(AtomicPtrDiffT);
266 for (auto &I : Atomic64BitTypes)
267 setOpenCLExtensionForType(I,
268 "cl_khr_int64_base_atomics cl_khr_int64_extended_atomics");
270 setOpenCLExtensionForType(AtomicDoubleT, "cl_khr_fp64");
273 setOpenCLExtensionForType(Context.DoubleTy, "cl_khr_fp64");
275 #define GENERIC_IMAGE_TYPE_EXT(Type, Id, Ext) \
276 setOpenCLExtensionForType(Context.Id, Ext);
277 #include "clang/Basic/OpenCLImageTypes.def"
280 if (Context.getTargetInfo().hasBuiltinMSVaList()) {
281 DeclarationName MSVaList = &Context.Idents.get("__builtin_ms_va_list");
282 if (IdResolver.begin(MSVaList) == IdResolver.end())
283 PushOnScopeChains(Context.getBuiltinMSVaListDecl(), TUScope);
286 DeclarationName BuiltinVaList = &Context.Idents.get("__builtin_va_list");
287 if (IdResolver.begin(BuiltinVaList) == IdResolver.end())
288 PushOnScopeChains(Context.getBuiltinVaListDecl(), TUScope);
292 if (VisContext) FreeVisContext();
293 // Kill all the active scopes.
294 for (unsigned I = 1, E = FunctionScopes.size(); I != E; ++I)
295 delete FunctionScopes[I];
296 if (FunctionScopes.size() == 1)
297 delete FunctionScopes[0];
299 // Tell the SemaConsumer to forget about us; we're going out of scope.
300 if (SemaConsumer *SC = dyn_cast<SemaConsumer>(&Consumer))
303 // Detach from the external Sema source.
304 if (ExternalSemaSource *ExternalSema
305 = dyn_cast_or_null<ExternalSemaSource>(Context.getExternalSource()))
306 ExternalSema->ForgetSema();
308 // If Sema's ExternalSource is the multiplexer - we own it.
309 if (isMultiplexExternalSource)
310 delete ExternalSource;
312 threadSafety::threadSafetyCleanup(ThreadSafetyDeclCache);
314 // Destroys data sharing attributes stack for OpenMP
315 DestroyDataSharingAttributesStack();
317 assert(DelayedTypos.empty() && "Uncorrected typos!");
320 /// makeUnavailableInSystemHeader - There is an error in the current
321 /// context. If we're still in a system header, and we can plausibly
322 /// make the relevant declaration unavailable instead of erroring, do
323 /// so and return true.
324 bool Sema::makeUnavailableInSystemHeader(SourceLocation loc,
325 UnavailableAttr::ImplicitReason reason) {
326 // If we're not in a function, it's an error.
327 FunctionDecl *fn = dyn_cast<FunctionDecl>(CurContext);
328 if (!fn) return false;
330 // If we're in template instantiation, it's an error.
331 if (!ActiveTemplateInstantiations.empty())
334 // If that function's not in a system header, it's an error.
335 if (!Context.getSourceManager().isInSystemHeader(loc))
338 // If the function is already unavailable, it's not an error.
339 if (fn->hasAttr<UnavailableAttr>()) return true;
341 fn->addAttr(UnavailableAttr::CreateImplicit(Context, "", reason, loc));
345 ASTMutationListener *Sema::getASTMutationListener() const {
346 return getASTConsumer().GetASTMutationListener();
349 ///\brief Registers an external source. If an external source already exists,
350 /// creates a multiplex external source and appends to it.
352 ///\param[in] E - A non-null external sema source.
354 void Sema::addExternalSource(ExternalSemaSource *E) {
355 assert(E && "Cannot use with NULL ptr");
357 if (!ExternalSource) {
362 if (isMultiplexExternalSource)
363 static_cast<MultiplexExternalSemaSource*>(ExternalSource)->addSource(*E);
365 ExternalSource = new MultiplexExternalSemaSource(*ExternalSource, *E);
366 isMultiplexExternalSource = true;
370 /// \brief Print out statistics about the semantic analysis.
371 void Sema::PrintStats() const {
372 llvm::errs() << "\n*** Semantic Analysis Stats:\n";
373 llvm::errs() << NumSFINAEErrors << " SFINAE diagnostics trapped.\n";
375 BumpAlloc.PrintStats();
376 AnalysisWarnings.PrintStats();
379 void Sema::diagnoseNullableToNonnullConversion(QualType DstType,
381 SourceLocation Loc) {
382 Optional<NullabilityKind> ExprNullability = SrcType->getNullability(Context);
383 if (!ExprNullability || *ExprNullability != NullabilityKind::Nullable)
386 Optional<NullabilityKind> TypeNullability = DstType->getNullability(Context);
387 if (!TypeNullability || *TypeNullability != NullabilityKind::NonNull)
390 Diag(Loc, diag::warn_nullability_lost) << SrcType << DstType;
393 /// ImpCastExprToType - If Expr is not of type 'Type', insert an implicit cast.
394 /// If there is already an implicit cast, merge into the existing one.
395 /// The result is of the given category.
396 ExprResult Sema::ImpCastExprToType(Expr *E, QualType Ty,
397 CastKind Kind, ExprValueKind VK,
398 const CXXCastPath *BasePath,
399 CheckedConversionKind CCK) {
401 if (VK == VK_RValue && !E->isRValue()) {
404 llvm_unreachable("can't implicitly cast lvalue to rvalue with this cast "
406 case CK_LValueToRValue:
407 case CK_ArrayToPointerDecay:
408 case CK_FunctionToPointerDecay:
413 assert((VK == VK_RValue || !E->isRValue()) && "can't cast rvalue to lvalue");
416 diagnoseNullableToNonnullConversion(Ty, E->getType(), E->getLocStart());
418 QualType ExprTy = Context.getCanonicalType(E->getType());
419 QualType TypeTy = Context.getCanonicalType(Ty);
421 if (ExprTy == TypeTy)
424 // C++1z [conv.array]: The temporary materialization conversion is applied.
425 // We also use this to fuel C++ DR1213, which applies to C++11 onwards.
426 if (Kind == CK_ArrayToPointerDecay && getLangOpts().CPlusPlus &&
427 E->getValueKind() == VK_RValue) {
428 // The temporary is an lvalue in C++98 and an xvalue otherwise.
429 ExprResult Materialized = CreateMaterializeTemporaryExpr(
430 E->getType(), E, !getLangOpts().CPlusPlus11);
431 if (Materialized.isInvalid())
433 E = Materialized.get();
436 if (ImplicitCastExpr *ImpCast = dyn_cast<ImplicitCastExpr>(E)) {
437 if (ImpCast->getCastKind() == Kind && (!BasePath || BasePath->empty())) {
438 ImpCast->setType(Ty);
439 ImpCast->setValueKind(VK);
444 return ImplicitCastExpr::Create(Context, Ty, Kind, E, BasePath, VK);
447 /// ScalarTypeToBooleanCastKind - Returns the cast kind corresponding
448 /// to the conversion from scalar type ScalarTy to the Boolean type.
449 CastKind Sema::ScalarTypeToBooleanCastKind(QualType ScalarTy) {
450 switch (ScalarTy->getScalarTypeKind()) {
451 case Type::STK_Bool: return CK_NoOp;
452 case Type::STK_CPointer: return CK_PointerToBoolean;
453 case Type::STK_BlockPointer: return CK_PointerToBoolean;
454 case Type::STK_ObjCObjectPointer: return CK_PointerToBoolean;
455 case Type::STK_MemberPointer: return CK_MemberPointerToBoolean;
456 case Type::STK_Integral: return CK_IntegralToBoolean;
457 case Type::STK_Floating: return CK_FloatingToBoolean;
458 case Type::STK_IntegralComplex: return CK_IntegralComplexToBoolean;
459 case Type::STK_FloatingComplex: return CK_FloatingComplexToBoolean;
464 /// \brief Used to prune the decls of Sema's UnusedFileScopedDecls vector.
465 static bool ShouldRemoveFromUnused(Sema *SemaRef, const DeclaratorDecl *D) {
466 if (D->getMostRecentDecl()->isUsed())
469 if (D->isExternallyVisible())
472 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
473 // UnusedFileScopedDecls stores the first declaration.
474 // The declaration may have become definition so check again.
475 const FunctionDecl *DeclToCheck;
476 if (FD->hasBody(DeclToCheck))
477 return !SemaRef->ShouldWarnIfUnusedFileScopedDecl(DeclToCheck);
479 // Later redecls may add new information resulting in not having to warn,
481 DeclToCheck = FD->getMostRecentDecl();
482 if (DeclToCheck != FD)
483 return !SemaRef->ShouldWarnIfUnusedFileScopedDecl(DeclToCheck);
486 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) {
487 // If a variable usable in constant expressions is referenced,
488 // don't warn if it isn't used: if the value of a variable is required
489 // for the computation of a constant expression, it doesn't make sense to
490 // warn even if the variable isn't odr-used. (isReferenced doesn't
491 // precisely reflect that, but it's a decent approximation.)
492 if (VD->isReferenced() &&
493 VD->isUsableInConstantExpressions(SemaRef->Context))
496 // UnusedFileScopedDecls stores the first declaration.
497 // The declaration may have become definition so check again.
498 const VarDecl *DeclToCheck = VD->getDefinition();
500 return !SemaRef->ShouldWarnIfUnusedFileScopedDecl(DeclToCheck);
502 // Later redecls may add new information resulting in not having to warn,
504 DeclToCheck = VD->getMostRecentDecl();
505 if (DeclToCheck != VD)
506 return !SemaRef->ShouldWarnIfUnusedFileScopedDecl(DeclToCheck);
512 /// Obtains a sorted list of functions and variables that are undefined but
514 void Sema::getUndefinedButUsed(
515 SmallVectorImpl<std::pair<NamedDecl *, SourceLocation> > &Undefined) {
516 for (const auto &UndefinedUse : UndefinedButUsed) {
517 NamedDecl *ND = UndefinedUse.first;
519 // Ignore attributes that have become invalid.
520 if (ND->isInvalidDecl()) continue;
522 // __attribute__((weakref)) is basically a definition.
523 if (ND->hasAttr<WeakRefAttr>()) continue;
525 if (FunctionDecl *FD = dyn_cast<FunctionDecl>(ND)) {
528 if (FD->isExternallyVisible() &&
529 !FD->getMostRecentDecl()->isInlined())
532 auto *VD = cast<VarDecl>(ND);
533 if (VD->hasDefinition() != VarDecl::DeclarationOnly)
535 if (VD->isExternallyVisible() && !VD->getMostRecentDecl()->isInline())
539 Undefined.push_back(std::make_pair(ND, UndefinedUse.second));
543 /// checkUndefinedButUsed - Check for undefined objects with internal linkage
544 /// or that are inline.
545 static void checkUndefinedButUsed(Sema &S) {
546 if (S.UndefinedButUsed.empty()) return;
548 // Collect all the still-undefined entities with internal linkage.
549 SmallVector<std::pair<NamedDecl *, SourceLocation>, 16> Undefined;
550 S.getUndefinedButUsed(Undefined);
551 if (Undefined.empty()) return;
553 for (SmallVectorImpl<std::pair<NamedDecl *, SourceLocation> >::iterator
554 I = Undefined.begin(), E = Undefined.end(); I != E; ++I) {
555 NamedDecl *ND = I->first;
557 if (ND->hasAttr<DLLImportAttr>() || ND->hasAttr<DLLExportAttr>()) {
558 // An exported function will always be emitted when defined, so even if
559 // the function is inline, it doesn't have to be emitted in this TU. An
560 // imported function implies that it has been exported somewhere else.
564 if (!ND->isExternallyVisible()) {
565 S.Diag(ND->getLocation(), diag::warn_undefined_internal)
566 << isa<VarDecl>(ND) << ND;
567 } else if (auto *FD = dyn_cast<FunctionDecl>(ND)) {
569 assert(FD->getMostRecentDecl()->isInlined() &&
570 "used object requires definition but isn't inline or internal?");
571 // FIXME: This is ill-formed; we should reject.
572 S.Diag(ND->getLocation(), diag::warn_undefined_inline) << ND;
574 assert(cast<VarDecl>(ND)->getMostRecentDecl()->isInline() &&
575 "used var requires definition but isn't inline or internal?");
576 S.Diag(ND->getLocation(), diag::err_undefined_inline_var) << ND;
578 if (I->second.isValid())
579 S.Diag(I->second, diag::note_used_here);
582 S.UndefinedButUsed.clear();
585 void Sema::LoadExternalWeakUndeclaredIdentifiers() {
589 SmallVector<std::pair<IdentifierInfo *, WeakInfo>, 4> WeakIDs;
590 ExternalSource->ReadWeakUndeclaredIdentifiers(WeakIDs);
591 for (auto &WeakID : WeakIDs)
592 WeakUndeclaredIdentifiers.insert(WeakID);
596 typedef llvm::DenseMap<const CXXRecordDecl*, bool> RecordCompleteMap;
598 /// \brief Returns true, if all methods and nested classes of the given
599 /// CXXRecordDecl are defined in this translation unit.
601 /// Should only be called from ActOnEndOfTranslationUnit so that all
602 /// definitions are actually read.
603 static bool MethodsAndNestedClassesComplete(const CXXRecordDecl *RD,
604 RecordCompleteMap &MNCComplete) {
605 RecordCompleteMap::iterator Cache = MNCComplete.find(RD);
606 if (Cache != MNCComplete.end())
607 return Cache->second;
608 if (!RD->isCompleteDefinition())
610 bool Complete = true;
611 for (DeclContext::decl_iterator I = RD->decls_begin(),
613 I != E && Complete; ++I) {
614 if (const CXXMethodDecl *M = dyn_cast<CXXMethodDecl>(*I))
615 Complete = M->isDefined() || (M->isPure() && !isa<CXXDestructorDecl>(M));
616 else if (const FunctionTemplateDecl *F = dyn_cast<FunctionTemplateDecl>(*I))
617 // If the template function is marked as late template parsed at this
618 // point, it has not been instantiated and therefore we have not
619 // performed semantic analysis on it yet, so we cannot know if the type
620 // can be considered complete.
621 Complete = !F->getTemplatedDecl()->isLateTemplateParsed() &&
622 F->getTemplatedDecl()->isDefined();
623 else if (const CXXRecordDecl *R = dyn_cast<CXXRecordDecl>(*I)) {
624 if (R->isInjectedClassName())
626 if (R->hasDefinition())
627 Complete = MethodsAndNestedClassesComplete(R->getDefinition(),
633 MNCComplete[RD] = Complete;
637 /// \brief Returns true, if the given CXXRecordDecl is fully defined in this
638 /// translation unit, i.e. all methods are defined or pure virtual and all
639 /// friends, friend functions and nested classes are fully defined in this
640 /// translation unit.
642 /// Should only be called from ActOnEndOfTranslationUnit so that all
643 /// definitions are actually read.
644 static bool IsRecordFullyDefined(const CXXRecordDecl *RD,
645 RecordCompleteMap &RecordsComplete,
646 RecordCompleteMap &MNCComplete) {
647 RecordCompleteMap::iterator Cache = RecordsComplete.find(RD);
648 if (Cache != RecordsComplete.end())
649 return Cache->second;
650 bool Complete = MethodsAndNestedClassesComplete(RD, MNCComplete);
651 for (CXXRecordDecl::friend_iterator I = RD->friend_begin(),
652 E = RD->friend_end();
653 I != E && Complete; ++I) {
654 // Check if friend classes and methods are complete.
655 if (TypeSourceInfo *TSI = (*I)->getFriendType()) {
656 // Friend classes are available as the TypeSourceInfo of the FriendDecl.
657 if (CXXRecordDecl *FriendD = TSI->getType()->getAsCXXRecordDecl())
658 Complete = MethodsAndNestedClassesComplete(FriendD, MNCComplete);
662 // Friend functions are available through the NamedDecl of FriendDecl.
663 if (const FunctionDecl *FD =
664 dyn_cast<FunctionDecl>((*I)->getFriendDecl()))
665 Complete = FD->isDefined();
667 // This is a template friend, give up.
671 RecordsComplete[RD] = Complete;
675 void Sema::emitAndClearUnusedLocalTypedefWarnings() {
677 ExternalSource->ReadUnusedLocalTypedefNameCandidates(
678 UnusedLocalTypedefNameCandidates);
679 for (const TypedefNameDecl *TD : UnusedLocalTypedefNameCandidates) {
680 if (TD->isReferenced())
682 Diag(TD->getLocation(), diag::warn_unused_local_typedef)
683 << isa<TypeAliasDecl>(TD) << TD->getDeclName();
685 UnusedLocalTypedefNameCandidates.clear();
688 /// ActOnEndOfTranslationUnit - This is called at the very end of the
689 /// translation unit when EOF is reached and all but the top-level scope is
691 void Sema::ActOnEndOfTranslationUnit() {
692 assert(DelayedDiagnostics.getCurrentPool() == nullptr
693 && "reached end of translation unit with a pool attached?");
695 // If code completion is enabled, don't perform any end-of-translation-unit
697 if (PP.isCodeCompletionEnabled())
700 // Complete translation units and modules define vtables and perform implicit
701 // instantiations. PCH files do not.
702 if (TUKind != TU_Prefix) {
703 DiagnoseUseOfUnimplementedSelectors();
705 // If DefinedUsedVTables ends up marking any virtual member functions it
706 // might lead to more pending template instantiations, which we then need
710 // C++: Perform implicit template instantiations.
712 // FIXME: When we perform these implicit instantiations, we do not
713 // carefully keep track of the point of instantiation (C++ [temp.point]).
714 // This means that name lookup that occurs within the template
715 // instantiation will always happen at the end of the translation unit,
716 // so it will find some names that are not required to be found. This is
717 // valid, but we could do better by diagnosing if an instantiation uses a
718 // name that was not visible at its first point of instantiation.
719 if (ExternalSource) {
720 // Load pending instantiations from the external source.
721 SmallVector<PendingImplicitInstantiation, 4> Pending;
722 ExternalSource->ReadPendingInstantiations(Pending);
723 PendingInstantiations.insert(PendingInstantiations.begin(),
724 Pending.begin(), Pending.end());
726 PerformPendingInstantiations();
728 if (LateTemplateParserCleanup)
729 LateTemplateParserCleanup(OpaqueParser);
731 CheckDelayedMemberExceptionSpecs();
734 // All delayed member exception specs should be checked or we end up accepting
735 // incompatible declarations.
736 // FIXME: This is wrong for TUKind == TU_Prefix. In that case, we need to
737 // write out the lists to the AST file (if any).
738 assert(DelayedDefaultedMemberExceptionSpecs.empty());
739 assert(DelayedExceptionSpecChecks.empty());
741 // All dllexport classes should have been processed already.
742 assert(DelayedDllExportClasses.empty());
744 // Remove file scoped decls that turned out to be used.
745 UnusedFileScopedDecls.erase(
746 std::remove_if(UnusedFileScopedDecls.begin(nullptr, true),
747 UnusedFileScopedDecls.end(),
748 std::bind1st(std::ptr_fun(ShouldRemoveFromUnused), this)),
749 UnusedFileScopedDecls.end());
751 if (TUKind == TU_Prefix) {
752 // Translation unit prefixes don't need any of the checking below.
753 if (!PP.isIncrementalProcessingEnabled())
758 // Check for #pragma weak identifiers that were never declared
759 LoadExternalWeakUndeclaredIdentifiers();
760 for (auto WeakID : WeakUndeclaredIdentifiers) {
761 if (WeakID.second.getUsed())
764 Decl *PrevDecl = LookupSingleName(TUScope, WeakID.first, SourceLocation(),
766 if (PrevDecl != nullptr &&
767 !(isa<FunctionDecl>(PrevDecl) || isa<VarDecl>(PrevDecl)))
768 Diag(WeakID.second.getLocation(), diag::warn_attribute_wrong_decl_type)
769 << "'weak'" << ExpectedVariableOrFunction;
771 Diag(WeakID.second.getLocation(), diag::warn_weak_identifier_undeclared)
775 if (LangOpts.CPlusPlus11 &&
776 !Diags.isIgnored(diag::warn_delegating_ctor_cycle, SourceLocation()))
777 CheckDelegatingCtorCycles();
779 if (!Diags.hasErrorOccurred()) {
781 ExternalSource->ReadUndefinedButUsed(UndefinedButUsed);
782 checkUndefinedButUsed(*this);
785 if (TUKind == TU_Module) {
786 // If we are building a module, resolve all of the exported declarations
788 if (Module *CurrentModule = PP.getCurrentModule()) {
789 ModuleMap &ModMap = PP.getHeaderSearchInfo().getModuleMap();
791 SmallVector<Module *, 2> Stack;
792 Stack.push_back(CurrentModule);
793 while (!Stack.empty()) {
794 Module *Mod = Stack.pop_back_val();
796 // Resolve the exported declarations and conflicts.
797 // FIXME: Actually complain, once we figure out how to teach the
798 // diagnostic client to deal with complaints in the module map at this
800 ModMap.resolveExports(Mod, /*Complain=*/false);
801 ModMap.resolveUses(Mod, /*Complain=*/false);
802 ModMap.resolveConflicts(Mod, /*Complain=*/false);
804 // Queue the submodules, so their exports will also be resolved.
805 Stack.append(Mod->submodule_begin(), Mod->submodule_end());
809 // Warnings emitted in ActOnEndOfTranslationUnit() should be emitted for
810 // modules when they are built, not every time they are used.
811 emitAndClearUnusedLocalTypedefWarnings();
813 // Modules don't need any of the checking below.
819 // A declaration of an identifier for an object that has file
820 // scope without an initializer, and without a storage-class
821 // specifier or with the storage-class specifier static,
822 // constitutes a tentative definition. If a translation unit
823 // contains one or more tentative definitions for an identifier,
824 // and the translation unit contains no external definition for
825 // that identifier, then the behavior is exactly as if the
826 // translation unit contains a file scope declaration of that
827 // identifier, with the composite type as of the end of the
828 // translation unit, with an initializer equal to 0.
829 llvm::SmallSet<VarDecl *, 32> Seen;
830 for (TentativeDefinitionsType::iterator
831 T = TentativeDefinitions.begin(ExternalSource),
832 TEnd = TentativeDefinitions.end();
835 VarDecl *VD = (*T)->getActingDefinition();
837 // If the tentative definition was completed, getActingDefinition() returns
838 // null. If we've already seen this variable before, insert()'s second
839 // return value is false.
840 if (!VD || VD->isInvalidDecl() || !Seen.insert(VD).second)
843 if (const IncompleteArrayType *ArrayT
844 = Context.getAsIncompleteArrayType(VD->getType())) {
845 // Set the length of the array to 1 (C99 6.9.2p5).
846 Diag(VD->getLocation(), diag::warn_tentative_incomplete_array);
847 llvm::APInt One(Context.getTypeSize(Context.getSizeType()), true);
848 QualType T = Context.getConstantArrayType(ArrayT->getElementType(),
849 One, ArrayType::Normal, 0);
851 } else if (RequireCompleteType(VD->getLocation(), VD->getType(),
852 diag::err_tentative_def_incomplete_type))
853 VD->setInvalidDecl();
855 // No initialization is performed for a tentative definition.
856 CheckCompleteVariableDeclaration(VD);
858 // Notify the consumer that we've completed a tentative definition.
859 if (!VD->isInvalidDecl())
860 Consumer.CompleteTentativeDefinition(VD);
864 // If there were errors, disable 'unused' warnings since they will mostly be
866 if (!Diags.hasErrorOccurred()) {
867 // Output warning for unused file scoped decls.
868 for (UnusedFileScopedDeclsType::iterator
869 I = UnusedFileScopedDecls.begin(ExternalSource),
870 E = UnusedFileScopedDecls.end(); I != E; ++I) {
871 if (ShouldRemoveFromUnused(this, *I))
874 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(*I)) {
875 const FunctionDecl *DiagD;
876 if (!FD->hasBody(DiagD))
878 if (DiagD->isDeleted())
879 continue; // Deleted functions are supposed to be unused.
880 if (DiagD->isReferenced()) {
881 if (isa<CXXMethodDecl>(DiagD))
882 Diag(DiagD->getLocation(), diag::warn_unneeded_member_function)
883 << DiagD->getDeclName();
885 if (FD->getStorageClass() == SC_Static &&
886 !FD->isInlineSpecified() &&
887 !SourceMgr.isInMainFile(
888 SourceMgr.getExpansionLoc(FD->getLocation())))
889 Diag(DiagD->getLocation(),
890 diag::warn_unneeded_static_internal_decl)
891 << DiagD->getDeclName();
893 Diag(DiagD->getLocation(), diag::warn_unneeded_internal_decl)
894 << /*function*/0 << DiagD->getDeclName();
897 Diag(DiagD->getLocation(),
898 isa<CXXMethodDecl>(DiagD) ? diag::warn_unused_member_function
899 : diag::warn_unused_function)
900 << DiagD->getDeclName();
903 const VarDecl *DiagD = cast<VarDecl>(*I)->getDefinition();
905 DiagD = cast<VarDecl>(*I);
906 if (DiagD->isReferenced()) {
907 Diag(DiagD->getLocation(), diag::warn_unneeded_internal_decl)
908 << /*variable*/1 << DiagD->getDeclName();
909 } else if (DiagD->getType().isConstQualified()) {
910 const SourceManager &SM = SourceMgr;
911 if (SM.getMainFileID() != SM.getFileID(DiagD->getLocation()) ||
912 !PP.getLangOpts().IsHeaderFile)
913 Diag(DiagD->getLocation(), diag::warn_unused_const_variable)
914 << DiagD->getDeclName();
916 Diag(DiagD->getLocation(), diag::warn_unused_variable)
917 << DiagD->getDeclName();
922 emitAndClearUnusedLocalTypedefWarnings();
925 if (!Diags.isIgnored(diag::warn_unused_private_field, SourceLocation())) {
926 RecordCompleteMap RecordsComplete;
927 RecordCompleteMap MNCComplete;
928 for (NamedDeclSetType::iterator I = UnusedPrivateFields.begin(),
929 E = UnusedPrivateFields.end(); I != E; ++I) {
930 const NamedDecl *D = *I;
931 const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(D->getDeclContext());
932 if (RD && !RD->isUnion() &&
933 IsRecordFullyDefined(RD, RecordsComplete, MNCComplete)) {
934 Diag(D->getLocation(), diag::warn_unused_private_field)
940 if (!Diags.isIgnored(diag::warn_mismatched_delete_new, SourceLocation())) {
942 ExternalSource->ReadMismatchingDeleteExpressions(DeleteExprs);
943 for (const auto &DeletedFieldInfo : DeleteExprs) {
944 for (const auto &DeleteExprLoc : DeletedFieldInfo.second) {
945 AnalyzeDeleteExprMismatch(DeletedFieldInfo.first, DeleteExprLoc.first,
946 DeleteExprLoc.second);
951 // Check we've noticed that we're no longer parsing the initializer for every
952 // variable. If we miss cases, then at best we have a performance issue and
953 // at worst a rejects-valid bug.
954 assert(ParsingInitForAutoVars.empty() &&
955 "Didn't unmark var as having its initializer parsed");
957 if (!PP.isIncrementalProcessingEnabled())
962 //===----------------------------------------------------------------------===//
964 //===----------------------------------------------------------------------===//
966 DeclContext *Sema::getFunctionLevelDeclContext() {
967 DeclContext *DC = CurContext;
970 if (isa<BlockDecl>(DC) || isa<EnumDecl>(DC) || isa<CapturedDecl>(DC)) {
971 DC = DC->getParent();
972 } else if (isa<CXXMethodDecl>(DC) &&
973 cast<CXXMethodDecl>(DC)->getOverloadedOperator() == OO_Call &&
974 cast<CXXRecordDecl>(DC->getParent())->isLambda()) {
975 DC = DC->getParent()->getParent();
983 /// getCurFunctionDecl - If inside of a function body, this returns a pointer
984 /// to the function decl for the function being parsed. If we're currently
985 /// in a 'block', this returns the containing context.
986 FunctionDecl *Sema::getCurFunctionDecl() {
987 DeclContext *DC = getFunctionLevelDeclContext();
988 return dyn_cast<FunctionDecl>(DC);
991 ObjCMethodDecl *Sema::getCurMethodDecl() {
992 DeclContext *DC = getFunctionLevelDeclContext();
993 while (isa<RecordDecl>(DC))
994 DC = DC->getParent();
995 return dyn_cast<ObjCMethodDecl>(DC);
998 NamedDecl *Sema::getCurFunctionOrMethodDecl() {
999 DeclContext *DC = getFunctionLevelDeclContext();
1000 if (isa<ObjCMethodDecl>(DC) || isa<FunctionDecl>(DC))
1001 return cast<NamedDecl>(DC);
1005 void Sema::EmitCurrentDiagnostic(unsigned DiagID) {
1006 // FIXME: It doesn't make sense to me that DiagID is an incoming argument here
1007 // and yet we also use the current diag ID on the DiagnosticsEngine. This has
1008 // been made more painfully obvious by the refactor that introduced this
1009 // function, but it is possible that the incoming argument can be
1010 // eliminnated. If it truly cannot be (for example, there is some reentrancy
1011 // issue I am not seeing yet), then there should at least be a clarifying
1012 // comment somewhere.
1013 if (Optional<TemplateDeductionInfo*> Info = isSFINAEContext()) {
1014 switch (DiagnosticIDs::getDiagnosticSFINAEResponse(
1015 Diags.getCurrentDiagID())) {
1016 case DiagnosticIDs::SFINAE_Report:
1017 // We'll report the diagnostic below.
1020 case DiagnosticIDs::SFINAE_SubstitutionFailure:
1021 // Count this failure so that we know that template argument deduction
1025 // Make a copy of this suppressed diagnostic and store it with the
1026 // template-deduction information.
1027 if (*Info && !(*Info)->hasSFINAEDiagnostic()) {
1028 Diagnostic DiagInfo(&Diags);
1029 (*Info)->addSFINAEDiagnostic(DiagInfo.getLocation(),
1030 PartialDiagnostic(DiagInfo, Context.getDiagAllocator()));
1033 Diags.setLastDiagnosticIgnored();
1037 case DiagnosticIDs::SFINAE_AccessControl: {
1038 // Per C++ Core Issue 1170, access control is part of SFINAE.
1039 // Additionally, the AccessCheckingSFINAE flag can be used to temporarily
1040 // make access control a part of SFINAE for the purposes of checking
1042 if (!AccessCheckingSFINAE && !getLangOpts().CPlusPlus11)
1045 SourceLocation Loc = Diags.getCurrentDiagLoc();
1047 // Suppress this diagnostic.
1050 // Make a copy of this suppressed diagnostic and store it with the
1051 // template-deduction information.
1052 if (*Info && !(*Info)->hasSFINAEDiagnostic()) {
1053 Diagnostic DiagInfo(&Diags);
1054 (*Info)->addSFINAEDiagnostic(DiagInfo.getLocation(),
1055 PartialDiagnostic(DiagInfo, Context.getDiagAllocator()));
1058 Diags.setLastDiagnosticIgnored();
1061 // Now the diagnostic state is clear, produce a C++98 compatibility
1063 Diag(Loc, diag::warn_cxx98_compat_sfinae_access_control);
1065 // The last diagnostic which Sema produced was ignored. Suppress any
1066 // notes attached to it.
1067 Diags.setLastDiagnosticIgnored();
1071 case DiagnosticIDs::SFINAE_Suppress:
1072 // Make a copy of this suppressed diagnostic and store it with the
1073 // template-deduction information;
1075 Diagnostic DiagInfo(&Diags);
1076 (*Info)->addSuppressedDiagnostic(DiagInfo.getLocation(),
1077 PartialDiagnostic(DiagInfo, Context.getDiagAllocator()));
1080 // Suppress this diagnostic.
1081 Diags.setLastDiagnosticIgnored();
1087 // Set up the context's printing policy based on our current state.
1088 Context.setPrintingPolicy(getPrintingPolicy());
1090 // Emit the diagnostic.
1091 if (!Diags.EmitCurrentDiagnostic())
1094 // If this is not a note, and we're in a template instantiation
1095 // that is different from the last template instantiation where
1096 // we emitted an error, print a template instantiation
1098 if (!DiagnosticIDs::isBuiltinNote(DiagID) &&
1099 !ActiveTemplateInstantiations.empty() &&
1100 ActiveTemplateInstantiations.back()
1101 != LastTemplateInstantiationErrorContext) {
1102 PrintInstantiationStack();
1103 LastTemplateInstantiationErrorContext = ActiveTemplateInstantiations.back();
1107 Sema::SemaDiagnosticBuilder
1108 Sema::Diag(SourceLocation Loc, const PartialDiagnostic& PD) {
1109 SemaDiagnosticBuilder Builder(Diag(Loc, PD.getDiagID()));
1115 /// \brief Looks through the macro-expansion chain for the given
1116 /// location, looking for a macro expansion with the given name.
1117 /// If one is found, returns true and sets the location to that
1119 bool Sema::findMacroSpelling(SourceLocation &locref, StringRef name) {
1120 SourceLocation loc = locref;
1121 if (!loc.isMacroID()) return false;
1123 // There's no good way right now to look at the intermediate
1124 // expansions, so just jump to the expansion location.
1125 loc = getSourceManager().getExpansionLoc(loc);
1127 // If that's written with the name, stop here.
1128 SmallVector<char, 16> buffer;
1129 if (getPreprocessor().getSpelling(loc, buffer) == name) {
1136 /// \brief Determines the active Scope associated with the given declaration
1139 /// This routine maps a declaration context to the active Scope object that
1140 /// represents that declaration context in the parser. It is typically used
1141 /// from "scope-less" code (e.g., template instantiation, lazy creation of
1142 /// declarations) that injects a name for name-lookup purposes and, therefore,
1143 /// must update the Scope.
1145 /// \returns The scope corresponding to the given declaraion context, or NULL
1146 /// if no such scope is open.
1147 Scope *Sema::getScopeForContext(DeclContext *Ctx) {
1152 Ctx = Ctx->getPrimaryContext();
1153 for (Scope *S = getCurScope(); S; S = S->getParent()) {
1154 // Ignore scopes that cannot have declarations. This is important for
1155 // out-of-line definitions of static class members.
1156 if (S->getFlags() & (Scope::DeclScope | Scope::TemplateParamScope))
1157 if (DeclContext *Entity = S->getEntity())
1158 if (Ctx == Entity->getPrimaryContext())
1165 /// \brief Enter a new function scope
1166 void Sema::PushFunctionScope() {
1167 if (FunctionScopes.size() == 1) {
1168 // Use the "top" function scope rather than having to allocate
1169 // memory for a new scope.
1170 FunctionScopes.back()->Clear();
1171 FunctionScopes.push_back(FunctionScopes.back());
1175 FunctionScopes.push_back(new FunctionScopeInfo(getDiagnostics()));
1178 void Sema::PushBlockScope(Scope *BlockScope, BlockDecl *Block) {
1179 FunctionScopes.push_back(new BlockScopeInfo(getDiagnostics(),
1180 BlockScope, Block));
1183 LambdaScopeInfo *Sema::PushLambdaScope() {
1184 LambdaScopeInfo *const LSI = new LambdaScopeInfo(getDiagnostics());
1185 FunctionScopes.push_back(LSI);
1189 void Sema::RecordParsingTemplateParameterDepth(unsigned Depth) {
1190 if (LambdaScopeInfo *const LSI = getCurLambda()) {
1191 LSI->AutoTemplateParameterDepth = Depth;
1195 "Remove assertion if intentionally called in a non-lambda context.");
1198 void Sema::PopFunctionScopeInfo(const AnalysisBasedWarnings::Policy *WP,
1199 const Decl *D, const BlockExpr *blkExpr) {
1200 FunctionScopeInfo *Scope = FunctionScopes.pop_back_val();
1201 assert(!FunctionScopes.empty() && "mismatched push/pop!");
1203 // Issue any analysis-based warnings.
1205 AnalysisWarnings.IssueWarnings(*WP, Scope, D, blkExpr);
1207 for (const auto &PUD : Scope->PossiblyUnreachableDiags)
1208 Diag(PUD.Loc, PUD.PD);
1210 if (FunctionScopes.back() != Scope)
1214 void Sema::PushCompoundScope() {
1215 getCurFunction()->CompoundScopes.push_back(CompoundScopeInfo());
1218 void Sema::PopCompoundScope() {
1219 FunctionScopeInfo *CurFunction = getCurFunction();
1220 assert(!CurFunction->CompoundScopes.empty() && "mismatched push/pop");
1222 CurFunction->CompoundScopes.pop_back();
1225 /// \brief Determine whether any errors occurred within this function/method/
1227 bool Sema::hasAnyUnrecoverableErrorsInThisFunction() const {
1228 return getCurFunction()->ErrorTrap.hasUnrecoverableErrorOccurred();
1231 BlockScopeInfo *Sema::getCurBlock() {
1232 if (FunctionScopes.empty())
1235 auto CurBSI = dyn_cast<BlockScopeInfo>(FunctionScopes.back());
1236 if (CurBSI && CurBSI->TheDecl &&
1237 !CurBSI->TheDecl->Encloses(CurContext)) {
1238 // We have switched contexts due to template instantiation.
1239 assert(!ActiveTemplateInstantiations.empty());
1246 LambdaScopeInfo *Sema::getCurLambda(bool IgnoreCapturedRegions) {
1247 if (FunctionScopes.empty())
1250 auto I = FunctionScopes.rbegin();
1251 if (IgnoreCapturedRegions) {
1252 auto E = FunctionScopes.rend();
1253 while (I != E && isa<CapturedRegionScopeInfo>(*I))
1258 auto *CurLSI = dyn_cast<LambdaScopeInfo>(*I);
1259 if (CurLSI && CurLSI->Lambda &&
1260 !CurLSI->Lambda->Encloses(CurContext)) {
1261 // We have switched contexts due to template instantiation.
1262 assert(!ActiveTemplateInstantiations.empty());
1268 // We have a generic lambda if we parsed auto parameters, or we have
1269 // an associated template parameter list.
1270 LambdaScopeInfo *Sema::getCurGenericLambda() {
1271 if (LambdaScopeInfo *LSI = getCurLambda()) {
1272 return (LSI->AutoTemplateParams.size() ||
1273 LSI->GLTemplateParameterList) ? LSI : nullptr;
1279 void Sema::ActOnComment(SourceRange Comment) {
1280 if (!LangOpts.RetainCommentsFromSystemHeaders &&
1281 SourceMgr.isInSystemHeader(Comment.getBegin()))
1283 RawComment RC(SourceMgr, Comment, false,
1284 LangOpts.CommentOpts.ParseAllComments);
1285 if (RC.isAlmostTrailingComment()) {
1286 SourceRange MagicMarkerRange(Comment.getBegin(),
1287 Comment.getBegin().getLocWithOffset(3));
1288 StringRef MagicMarkerText;
1289 switch (RC.getKind()) {
1290 case RawComment::RCK_OrdinaryBCPL:
1291 MagicMarkerText = "///<";
1293 case RawComment::RCK_OrdinaryC:
1294 MagicMarkerText = "/**<";
1297 llvm_unreachable("if this is an almost Doxygen comment, "
1298 "it should be ordinary");
1300 Diag(Comment.getBegin(), diag::warn_not_a_doxygen_trailing_member_comment) <<
1301 FixItHint::CreateReplacement(MagicMarkerRange, MagicMarkerText);
1303 Context.addComment(RC);
1306 // Pin this vtable to this file.
1307 ExternalSemaSource::~ExternalSemaSource() {}
1309 void ExternalSemaSource::ReadMethodPool(Selector Sel) { }
1310 void ExternalSemaSource::updateOutOfDateSelector(Selector Sel) { }
1312 void ExternalSemaSource::ReadKnownNamespaces(
1313 SmallVectorImpl<NamespaceDecl *> &Namespaces) {
1316 void ExternalSemaSource::ReadUndefinedButUsed(
1317 llvm::MapVector<NamedDecl *, SourceLocation> &Undefined) {}
1319 void ExternalSemaSource::ReadMismatchingDeleteExpressions(llvm::MapVector<
1320 FieldDecl *, llvm::SmallVector<std::pair<SourceLocation, bool>, 4>> &) {}
1322 void PrettyDeclStackTraceEntry::print(raw_ostream &OS) const {
1323 SourceLocation Loc = this->Loc;
1324 if (!Loc.isValid() && TheDecl) Loc = TheDecl->getLocation();
1325 if (Loc.isValid()) {
1326 Loc.print(OS, S.getSourceManager());
1331 if (auto *ND = dyn_cast_or_null<NamedDecl>(TheDecl)) {
1333 ND->getNameForDiagnostic(OS, ND->getASTContext().getPrintingPolicy(), true);
1340 /// \brief Figure out if an expression could be turned into a call.
1342 /// Use this when trying to recover from an error where the programmer may have
1343 /// written just the name of a function instead of actually calling it.
1345 /// \param E - The expression to examine.
1346 /// \param ZeroArgCallReturnTy - If the expression can be turned into a call
1347 /// with no arguments, this parameter is set to the type returned by such a
1348 /// call; otherwise, it is set to an empty QualType.
1349 /// \param OverloadSet - If the expression is an overloaded function
1350 /// name, this parameter is populated with the decls of the various overloads.
1351 bool Sema::tryExprAsCall(Expr &E, QualType &ZeroArgCallReturnTy,
1352 UnresolvedSetImpl &OverloadSet) {
1353 ZeroArgCallReturnTy = QualType();
1354 OverloadSet.clear();
1356 const OverloadExpr *Overloads = nullptr;
1357 bool IsMemExpr = false;
1358 if (E.getType() == Context.OverloadTy) {
1359 OverloadExpr::FindResult FR = OverloadExpr::find(const_cast<Expr*>(&E));
1361 // Ignore overloads that are pointer-to-member constants.
1362 if (FR.HasFormOfMemberPointer)
1365 Overloads = FR.Expression;
1366 } else if (E.getType() == Context.BoundMemberTy) {
1367 Overloads = dyn_cast<UnresolvedMemberExpr>(E.IgnoreParens());
1371 bool Ambiguous = false;
1374 for (OverloadExpr::decls_iterator it = Overloads->decls_begin(),
1375 DeclsEnd = Overloads->decls_end(); it != DeclsEnd; ++it) {
1376 OverloadSet.addDecl(*it);
1378 // Check whether the function is a non-template, non-member which takes no
1382 if (const FunctionDecl *OverloadDecl
1383 = dyn_cast<FunctionDecl>((*it)->getUnderlyingDecl())) {
1384 if (OverloadDecl->getMinRequiredArguments() == 0) {
1385 if (!ZeroArgCallReturnTy.isNull() && !Ambiguous) {
1386 ZeroArgCallReturnTy = QualType();
1389 ZeroArgCallReturnTy = OverloadDecl->getReturnType();
1394 // If it's not a member, use better machinery to try to resolve the call
1396 return !ZeroArgCallReturnTy.isNull();
1399 // Attempt to call the member with no arguments - this will correctly handle
1400 // member templates with defaults/deduction of template arguments, overloads
1401 // with default arguments, etc.
1402 if (IsMemExpr && !E.isTypeDependent()) {
1403 bool Suppress = getDiagnostics().getSuppressAllDiagnostics();
1404 getDiagnostics().setSuppressAllDiagnostics(true);
1405 ExprResult R = BuildCallToMemberFunction(nullptr, &E, SourceLocation(),
1406 None, SourceLocation());
1407 getDiagnostics().setSuppressAllDiagnostics(Suppress);
1409 ZeroArgCallReturnTy = R.get()->getType();
1415 if (const DeclRefExpr *DeclRef = dyn_cast<DeclRefExpr>(E.IgnoreParens())) {
1416 if (const FunctionDecl *Fun = dyn_cast<FunctionDecl>(DeclRef->getDecl())) {
1417 if (Fun->getMinRequiredArguments() == 0)
1418 ZeroArgCallReturnTy = Fun->getReturnType();
1423 // We don't have an expression that's convenient to get a FunctionDecl from,
1424 // but we can at least check if the type is "function of 0 arguments".
1425 QualType ExprTy = E.getType();
1426 const FunctionType *FunTy = nullptr;
1427 QualType PointeeTy = ExprTy->getPointeeType();
1428 if (!PointeeTy.isNull())
1429 FunTy = PointeeTy->getAs<FunctionType>();
1431 FunTy = ExprTy->getAs<FunctionType>();
1433 if (const FunctionProtoType *FPT =
1434 dyn_cast_or_null<FunctionProtoType>(FunTy)) {
1435 if (FPT->getNumParams() == 0)
1436 ZeroArgCallReturnTy = FunTy->getReturnType();
1442 /// \brief Give notes for a set of overloads.
1444 /// A companion to tryExprAsCall. In cases when the name that the programmer
1445 /// wrote was an overloaded function, we may be able to make some guesses about
1446 /// plausible overloads based on their return types; such guesses can be handed
1447 /// off to this method to be emitted as notes.
1449 /// \param Overloads - The overloads to note.
1450 /// \param FinalNoteLoc - If we've suppressed printing some overloads due to
1451 /// -fshow-overloads=best, this is the location to attach to the note about too
1452 /// many candidates. Typically this will be the location of the original
1453 /// ill-formed expression.
1454 static void noteOverloads(Sema &S, const UnresolvedSetImpl &Overloads,
1455 const SourceLocation FinalNoteLoc) {
1456 int ShownOverloads = 0;
1457 int SuppressedOverloads = 0;
1458 for (UnresolvedSetImpl::iterator It = Overloads.begin(),
1459 DeclsEnd = Overloads.end(); It != DeclsEnd; ++It) {
1460 // FIXME: Magic number for max shown overloads stolen from
1461 // OverloadCandidateSet::NoteCandidates.
1462 if (ShownOverloads >= 4 && S.Diags.getShowOverloads() == Ovl_Best) {
1463 ++SuppressedOverloads;
1467 NamedDecl *Fn = (*It)->getUnderlyingDecl();
1468 S.Diag(Fn->getLocation(), diag::note_possible_target_of_call);
1472 if (SuppressedOverloads)
1473 S.Diag(FinalNoteLoc, diag::note_ovl_too_many_candidates)
1474 << SuppressedOverloads;
1477 static void notePlausibleOverloads(Sema &S, SourceLocation Loc,
1478 const UnresolvedSetImpl &Overloads,
1479 bool (*IsPlausibleResult)(QualType)) {
1480 if (!IsPlausibleResult)
1481 return noteOverloads(S, Overloads, Loc);
1483 UnresolvedSet<2> PlausibleOverloads;
1484 for (OverloadExpr::decls_iterator It = Overloads.begin(),
1485 DeclsEnd = Overloads.end(); It != DeclsEnd; ++It) {
1486 const FunctionDecl *OverloadDecl = cast<FunctionDecl>(*It);
1487 QualType OverloadResultTy = OverloadDecl->getReturnType();
1488 if (IsPlausibleResult(OverloadResultTy))
1489 PlausibleOverloads.addDecl(It.getDecl());
1491 noteOverloads(S, PlausibleOverloads, Loc);
1494 /// Determine whether the given expression can be called by just
1495 /// putting parentheses after it. Notably, expressions with unary
1496 /// operators can't be because the unary operator will start parsing
1497 /// outside the call.
1498 static bool IsCallableWithAppend(Expr *E) {
1499 E = E->IgnoreImplicit();
1500 return (!isa<CStyleCastExpr>(E) &&
1501 !isa<UnaryOperator>(E) &&
1502 !isa<BinaryOperator>(E) &&
1503 !isa<CXXOperatorCallExpr>(E));
1506 bool Sema::tryToRecoverWithCall(ExprResult &E, const PartialDiagnostic &PD,
1508 bool (*IsPlausibleResult)(QualType)) {
1509 SourceLocation Loc = E.get()->getExprLoc();
1510 SourceRange Range = E.get()->getSourceRange();
1512 QualType ZeroArgCallTy;
1513 UnresolvedSet<4> Overloads;
1514 if (tryExprAsCall(*E.get(), ZeroArgCallTy, Overloads) &&
1515 !ZeroArgCallTy.isNull() &&
1516 (!IsPlausibleResult || IsPlausibleResult(ZeroArgCallTy))) {
1517 // At this point, we know E is potentially callable with 0
1518 // arguments and that it returns something of a reasonable type,
1519 // so we can emit a fixit and carry on pretending that E was
1520 // actually a CallExpr.
1521 SourceLocation ParenInsertionLoc = getLocForEndOfToken(Range.getEnd());
1523 << /*zero-arg*/ 1 << Range
1524 << (IsCallableWithAppend(E.get())
1525 ? FixItHint::CreateInsertion(ParenInsertionLoc, "()")
1527 notePlausibleOverloads(*this, Loc, Overloads, IsPlausibleResult);
1529 // FIXME: Try this before emitting the fixit, and suppress diagnostics
1531 E = ActOnCallExpr(nullptr, E.get(), Range.getEnd(), None,
1532 Range.getEnd().getLocWithOffset(1));
1536 if (!ForceComplain) return false;
1538 Diag(Loc, PD) << /*not zero-arg*/ 0 << Range;
1539 notePlausibleOverloads(*this, Loc, Overloads, IsPlausibleResult);
1544 IdentifierInfo *Sema::getSuperIdentifier() const {
1546 Ident_super = &Context.Idents.get("super");
1550 IdentifierInfo *Sema::getFloat128Identifier() const {
1551 if (!Ident___float128)
1552 Ident___float128 = &Context.Idents.get("__float128");
1553 return Ident___float128;
1556 void Sema::PushCapturedRegionScope(Scope *S, CapturedDecl *CD, RecordDecl *RD,
1557 CapturedRegionKind K) {
1558 CapturingScopeInfo *CSI = new CapturedRegionScopeInfo(
1559 getDiagnostics(), S, CD, RD, CD->getContextParam(), K,
1560 (getLangOpts().OpenMP && K == CR_OpenMP) ? getOpenMPNestingLevel() : 0);
1561 CSI->ReturnType = Context.VoidTy;
1562 FunctionScopes.push_back(CSI);
1565 CapturedRegionScopeInfo *Sema::getCurCapturedRegion() {
1566 if (FunctionScopes.empty())
1569 return dyn_cast<CapturedRegionScopeInfo>(FunctionScopes.back());
1572 const llvm::MapVector<FieldDecl *, Sema::DeleteLocs> &
1573 Sema::getMismatchingDeleteExpressions() const {
1577 void Sema::setOpenCLExtensionForType(QualType T, llvm::StringRef ExtStr) {
1580 llvm::SmallVector<StringRef, 1> Exts;
1581 ExtStr.split(Exts, " ", /* limit */ -1, /* keep empty */ false);
1582 auto CanT = T.getCanonicalType().getTypePtr();
1583 for (auto &I : Exts)
1584 OpenCLTypeExtMap[CanT].insert(I.str());
1587 void Sema::setOpenCLExtensionForDecl(Decl *FD, StringRef ExtStr) {
1588 llvm::SmallVector<StringRef, 1> Exts;
1589 ExtStr.split(Exts, " ", /* limit */ -1, /* keep empty */ false);
1592 for (auto &I : Exts)
1593 OpenCLDeclExtMap[FD].insert(I.str());
1596 void Sema::setCurrentOpenCLExtensionForType(QualType T) {
1597 if (CurrOpenCLExtension.empty())
1599 setOpenCLExtensionForType(T, CurrOpenCLExtension);
1602 void Sema::setCurrentOpenCLExtensionForDecl(Decl *D) {
1603 if (CurrOpenCLExtension.empty())
1605 setOpenCLExtensionForDecl(D, CurrOpenCLExtension);
1608 bool Sema::isOpenCLDisabledDecl(Decl *FD) {
1609 auto Loc = OpenCLDeclExtMap.find(FD);
1610 if (Loc == OpenCLDeclExtMap.end())
1612 for (auto &I : Loc->second) {
1613 if (!getOpenCLOptions().isEnabled(I))
1619 template <typename T, typename DiagLocT, typename DiagInfoT, typename MapT>
1620 bool Sema::checkOpenCLDisabledTypeOrDecl(T D, DiagLocT DiagLoc,
1621 DiagInfoT DiagInfo, MapT &Map,
1623 SourceRange SrcRange) {
1624 auto Loc = Map.find(D);
1625 if (Loc == Map.end())
1627 bool Disabled = false;
1628 for (auto &I : Loc->second) {
1629 if (I != CurrOpenCLExtension && !getOpenCLOptions().isEnabled(I)) {
1630 Diag(DiagLoc, diag::err_opencl_requires_extension) << Selector << DiagInfo
1638 bool Sema::checkOpenCLDisabledTypeDeclSpec(const DeclSpec &DS, QualType QT) {
1639 // Check extensions for declared types.
1640 Decl *Decl = nullptr;
1641 if (auto TypedefT = dyn_cast<TypedefType>(QT.getTypePtr()))
1642 Decl = TypedefT->getDecl();
1643 if (auto TagT = dyn_cast<TagType>(QT.getCanonicalType().getTypePtr()))
1644 Decl = TagT->getDecl();
1645 auto Loc = DS.getTypeSpecTypeLoc();
1646 if (checkOpenCLDisabledTypeOrDecl(Decl, Loc, QT, OpenCLDeclExtMap))
1649 // Check extensions for builtin types.
1650 return checkOpenCLDisabledTypeOrDecl(QT.getCanonicalType().getTypePtr(), Loc,
1651 QT, OpenCLTypeExtMap);
1654 bool Sema::checkOpenCLDisabledDecl(const Decl &D, const Expr &E) {
1655 return checkOpenCLDisabledTypeOrDecl(&D, E.getLocStart(), "",
1656 OpenCLDeclExtMap, 1, D.getSourceRange());