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 void Sema::diagnoseZeroToNullptrConversion(CastKind Kind, const Expr* E) {
387 if (Kind != CK_NullToPointer && Kind != CK_NullToMemberPointer)
389 if (E->getType()->isNullPtrType())
391 // nullptr only exists from C++11 on, so don't warn on its absence earlier.
392 if (!getLangOpts().CPlusPlus11)
395 Diag(E->getLocStart(), diag::warn_zero_as_null_pointer_constant)
396 << FixItHint::CreateReplacement(E->getSourceRange(), "nullptr");
399 /// ImpCastExprToType - If Expr is not of type 'Type', insert an implicit cast.
400 /// If there is already an implicit cast, merge into the existing one.
401 /// The result is of the given category.
402 ExprResult Sema::ImpCastExprToType(Expr *E, QualType Ty,
403 CastKind Kind, ExprValueKind VK,
404 const CXXCastPath *BasePath,
405 CheckedConversionKind CCK) {
407 if (VK == VK_RValue && !E->isRValue()) {
410 llvm_unreachable("can't implicitly cast lvalue to rvalue with this cast "
412 case CK_LValueToRValue:
413 case CK_ArrayToPointerDecay:
414 case CK_FunctionToPointerDecay:
419 assert((VK == VK_RValue || !E->isRValue()) && "can't cast rvalue to lvalue");
422 diagnoseNullableToNonnullConversion(Ty, E->getType(), E->getLocStart());
423 diagnoseZeroToNullptrConversion(Kind, E);
425 QualType ExprTy = Context.getCanonicalType(E->getType());
426 QualType TypeTy = Context.getCanonicalType(Ty);
428 if (ExprTy == TypeTy)
431 // C++1z [conv.array]: The temporary materialization conversion is applied.
432 // We also use this to fuel C++ DR1213, which applies to C++11 onwards.
433 if (Kind == CK_ArrayToPointerDecay && getLangOpts().CPlusPlus &&
434 E->getValueKind() == VK_RValue) {
435 // The temporary is an lvalue in C++98 and an xvalue otherwise.
436 ExprResult Materialized = CreateMaterializeTemporaryExpr(
437 E->getType(), E, !getLangOpts().CPlusPlus11);
438 if (Materialized.isInvalid())
440 E = Materialized.get();
443 if (ImplicitCastExpr *ImpCast = dyn_cast<ImplicitCastExpr>(E)) {
444 if (ImpCast->getCastKind() == Kind && (!BasePath || BasePath->empty())) {
445 ImpCast->setType(Ty);
446 ImpCast->setValueKind(VK);
451 return ImplicitCastExpr::Create(Context, Ty, Kind, E, BasePath, VK);
454 /// ScalarTypeToBooleanCastKind - Returns the cast kind corresponding
455 /// to the conversion from scalar type ScalarTy to the Boolean type.
456 CastKind Sema::ScalarTypeToBooleanCastKind(QualType ScalarTy) {
457 switch (ScalarTy->getScalarTypeKind()) {
458 case Type::STK_Bool: return CK_NoOp;
459 case Type::STK_CPointer: return CK_PointerToBoolean;
460 case Type::STK_BlockPointer: return CK_PointerToBoolean;
461 case Type::STK_ObjCObjectPointer: return CK_PointerToBoolean;
462 case Type::STK_MemberPointer: return CK_MemberPointerToBoolean;
463 case Type::STK_Integral: return CK_IntegralToBoolean;
464 case Type::STK_Floating: return CK_FloatingToBoolean;
465 case Type::STK_IntegralComplex: return CK_IntegralComplexToBoolean;
466 case Type::STK_FloatingComplex: return CK_FloatingComplexToBoolean;
471 /// \brief Used to prune the decls of Sema's UnusedFileScopedDecls vector.
472 static bool ShouldRemoveFromUnused(Sema *SemaRef, const DeclaratorDecl *D) {
473 if (D->getMostRecentDecl()->isUsed())
476 if (D->isExternallyVisible())
479 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
480 // UnusedFileScopedDecls stores the first declaration.
481 // The declaration may have become definition so check again.
482 const FunctionDecl *DeclToCheck;
483 if (FD->hasBody(DeclToCheck))
484 return !SemaRef->ShouldWarnIfUnusedFileScopedDecl(DeclToCheck);
486 // Later redecls may add new information resulting in not having to warn,
488 DeclToCheck = FD->getMostRecentDecl();
489 if (DeclToCheck != FD)
490 return !SemaRef->ShouldWarnIfUnusedFileScopedDecl(DeclToCheck);
493 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) {
494 // If a variable usable in constant expressions is referenced,
495 // don't warn if it isn't used: if the value of a variable is required
496 // for the computation of a constant expression, it doesn't make sense to
497 // warn even if the variable isn't odr-used. (isReferenced doesn't
498 // precisely reflect that, but it's a decent approximation.)
499 if (VD->isReferenced() &&
500 VD->isUsableInConstantExpressions(SemaRef->Context))
503 // UnusedFileScopedDecls stores the first declaration.
504 // The declaration may have become definition so check again.
505 const VarDecl *DeclToCheck = VD->getDefinition();
507 return !SemaRef->ShouldWarnIfUnusedFileScopedDecl(DeclToCheck);
509 // Later redecls may add new information resulting in not having to warn,
511 DeclToCheck = VD->getMostRecentDecl();
512 if (DeclToCheck != VD)
513 return !SemaRef->ShouldWarnIfUnusedFileScopedDecl(DeclToCheck);
519 /// Obtains a sorted list of functions and variables that are undefined but
521 void Sema::getUndefinedButUsed(
522 SmallVectorImpl<std::pair<NamedDecl *, SourceLocation> > &Undefined) {
523 for (const auto &UndefinedUse : UndefinedButUsed) {
524 NamedDecl *ND = UndefinedUse.first;
526 // Ignore attributes that have become invalid.
527 if (ND->isInvalidDecl()) continue;
529 // __attribute__((weakref)) is basically a definition.
530 if (ND->hasAttr<WeakRefAttr>()) continue;
532 if (FunctionDecl *FD = dyn_cast<FunctionDecl>(ND)) {
535 if (FD->isExternallyVisible() &&
536 !FD->getMostRecentDecl()->isInlined())
539 auto *VD = cast<VarDecl>(ND);
540 if (VD->hasDefinition() != VarDecl::DeclarationOnly)
542 if (VD->isExternallyVisible() && !VD->getMostRecentDecl()->isInline())
546 Undefined.push_back(std::make_pair(ND, UndefinedUse.second));
550 /// checkUndefinedButUsed - Check for undefined objects with internal linkage
551 /// or that are inline.
552 static void checkUndefinedButUsed(Sema &S) {
553 if (S.UndefinedButUsed.empty()) return;
555 // Collect all the still-undefined entities with internal linkage.
556 SmallVector<std::pair<NamedDecl *, SourceLocation>, 16> Undefined;
557 S.getUndefinedButUsed(Undefined);
558 if (Undefined.empty()) return;
560 for (SmallVectorImpl<std::pair<NamedDecl *, SourceLocation> >::iterator
561 I = Undefined.begin(), E = Undefined.end(); I != E; ++I) {
562 NamedDecl *ND = I->first;
564 if (ND->hasAttr<DLLImportAttr>() || ND->hasAttr<DLLExportAttr>()) {
565 // An exported function will always be emitted when defined, so even if
566 // the function is inline, it doesn't have to be emitted in this TU. An
567 // imported function implies that it has been exported somewhere else.
571 if (!ND->isExternallyVisible()) {
572 S.Diag(ND->getLocation(), diag::warn_undefined_internal)
573 << isa<VarDecl>(ND) << ND;
574 } else if (auto *FD = dyn_cast<FunctionDecl>(ND)) {
576 assert(FD->getMostRecentDecl()->isInlined() &&
577 "used object requires definition but isn't inline or internal?");
578 // FIXME: This is ill-formed; we should reject.
579 S.Diag(ND->getLocation(), diag::warn_undefined_inline) << ND;
581 assert(cast<VarDecl>(ND)->getMostRecentDecl()->isInline() &&
582 "used var requires definition but isn't inline or internal?");
583 S.Diag(ND->getLocation(), diag::err_undefined_inline_var) << ND;
585 if (I->second.isValid())
586 S.Diag(I->second, diag::note_used_here);
589 S.UndefinedButUsed.clear();
592 void Sema::LoadExternalWeakUndeclaredIdentifiers() {
596 SmallVector<std::pair<IdentifierInfo *, WeakInfo>, 4> WeakIDs;
597 ExternalSource->ReadWeakUndeclaredIdentifiers(WeakIDs);
598 for (auto &WeakID : WeakIDs)
599 WeakUndeclaredIdentifiers.insert(WeakID);
603 typedef llvm::DenseMap<const CXXRecordDecl*, bool> RecordCompleteMap;
605 /// \brief Returns true, if all methods and nested classes of the given
606 /// CXXRecordDecl are defined in this translation unit.
608 /// Should only be called from ActOnEndOfTranslationUnit so that all
609 /// definitions are actually read.
610 static bool MethodsAndNestedClassesComplete(const CXXRecordDecl *RD,
611 RecordCompleteMap &MNCComplete) {
612 RecordCompleteMap::iterator Cache = MNCComplete.find(RD);
613 if (Cache != MNCComplete.end())
614 return Cache->second;
615 if (!RD->isCompleteDefinition())
617 bool Complete = true;
618 for (DeclContext::decl_iterator I = RD->decls_begin(),
620 I != E && Complete; ++I) {
621 if (const CXXMethodDecl *M = dyn_cast<CXXMethodDecl>(*I))
622 Complete = M->isDefined() || (M->isPure() && !isa<CXXDestructorDecl>(M));
623 else if (const FunctionTemplateDecl *F = dyn_cast<FunctionTemplateDecl>(*I))
624 // If the template function is marked as late template parsed at this
625 // point, it has not been instantiated and therefore we have not
626 // performed semantic analysis on it yet, so we cannot know if the type
627 // can be considered complete.
628 Complete = !F->getTemplatedDecl()->isLateTemplateParsed() &&
629 F->getTemplatedDecl()->isDefined();
630 else if (const CXXRecordDecl *R = dyn_cast<CXXRecordDecl>(*I)) {
631 if (R->isInjectedClassName())
633 if (R->hasDefinition())
634 Complete = MethodsAndNestedClassesComplete(R->getDefinition(),
640 MNCComplete[RD] = Complete;
644 /// \brief Returns true, if the given CXXRecordDecl is fully defined in this
645 /// translation unit, i.e. all methods are defined or pure virtual and all
646 /// friends, friend functions and nested classes are fully defined in this
647 /// translation unit.
649 /// Should only be called from ActOnEndOfTranslationUnit so that all
650 /// definitions are actually read.
651 static bool IsRecordFullyDefined(const CXXRecordDecl *RD,
652 RecordCompleteMap &RecordsComplete,
653 RecordCompleteMap &MNCComplete) {
654 RecordCompleteMap::iterator Cache = RecordsComplete.find(RD);
655 if (Cache != RecordsComplete.end())
656 return Cache->second;
657 bool Complete = MethodsAndNestedClassesComplete(RD, MNCComplete);
658 for (CXXRecordDecl::friend_iterator I = RD->friend_begin(),
659 E = RD->friend_end();
660 I != E && Complete; ++I) {
661 // Check if friend classes and methods are complete.
662 if (TypeSourceInfo *TSI = (*I)->getFriendType()) {
663 // Friend classes are available as the TypeSourceInfo of the FriendDecl.
664 if (CXXRecordDecl *FriendD = TSI->getType()->getAsCXXRecordDecl())
665 Complete = MethodsAndNestedClassesComplete(FriendD, MNCComplete);
669 // Friend functions are available through the NamedDecl of FriendDecl.
670 if (const FunctionDecl *FD =
671 dyn_cast<FunctionDecl>((*I)->getFriendDecl()))
672 Complete = FD->isDefined();
674 // This is a template friend, give up.
678 RecordsComplete[RD] = Complete;
682 void Sema::emitAndClearUnusedLocalTypedefWarnings() {
684 ExternalSource->ReadUnusedLocalTypedefNameCandidates(
685 UnusedLocalTypedefNameCandidates);
686 for (const TypedefNameDecl *TD : UnusedLocalTypedefNameCandidates) {
687 if (TD->isReferenced())
689 Diag(TD->getLocation(), diag::warn_unused_local_typedef)
690 << isa<TypeAliasDecl>(TD) << TD->getDeclName();
692 UnusedLocalTypedefNameCandidates.clear();
695 /// ActOnEndOfTranslationUnit - This is called at the very end of the
696 /// translation unit when EOF is reached and all but the top-level scope is
698 void Sema::ActOnEndOfTranslationUnit() {
699 assert(DelayedDiagnostics.getCurrentPool() == nullptr
700 && "reached end of translation unit with a pool attached?");
702 // If code completion is enabled, don't perform any end-of-translation-unit
704 if (PP.isCodeCompletionEnabled())
707 // Complete translation units and modules define vtables and perform implicit
708 // instantiations. PCH files do not.
709 if (TUKind != TU_Prefix) {
710 DiagnoseUseOfUnimplementedSelectors();
712 // If DefinedUsedVTables ends up marking any virtual member functions it
713 // might lead to more pending template instantiations, which we then need
717 // C++: Perform implicit template instantiations.
719 // FIXME: When we perform these implicit instantiations, we do not
720 // carefully keep track of the point of instantiation (C++ [temp.point]).
721 // This means that name lookup that occurs within the template
722 // instantiation will always happen at the end of the translation unit,
723 // so it will find some names that are not required to be found. This is
724 // valid, but we could do better by diagnosing if an instantiation uses a
725 // name that was not visible at its first point of instantiation.
726 if (ExternalSource) {
727 // Load pending instantiations from the external source.
728 SmallVector<PendingImplicitInstantiation, 4> Pending;
729 ExternalSource->ReadPendingInstantiations(Pending);
730 PendingInstantiations.insert(PendingInstantiations.begin(),
731 Pending.begin(), Pending.end());
733 PerformPendingInstantiations();
735 if (LateTemplateParserCleanup)
736 LateTemplateParserCleanup(OpaqueParser);
738 CheckDelayedMemberExceptionSpecs();
741 DiagnoseUnterminatedPragmaAttribute();
743 // All delayed member exception specs should be checked or we end up accepting
744 // incompatible declarations.
745 // FIXME: This is wrong for TUKind == TU_Prefix. In that case, we need to
746 // write out the lists to the AST file (if any).
747 assert(DelayedDefaultedMemberExceptionSpecs.empty());
748 assert(DelayedExceptionSpecChecks.empty());
750 // All dllexport classes should have been processed already.
751 assert(DelayedDllExportClasses.empty());
753 // Remove file scoped decls that turned out to be used.
754 UnusedFileScopedDecls.erase(
755 std::remove_if(UnusedFileScopedDecls.begin(nullptr, true),
756 UnusedFileScopedDecls.end(),
757 [this](const DeclaratorDecl *DD) {
758 return ShouldRemoveFromUnused(this, DD);
760 UnusedFileScopedDecls.end());
762 if (TUKind == TU_Prefix) {
763 // Translation unit prefixes don't need any of the checking below.
764 if (!PP.isIncrementalProcessingEnabled())
769 // Check for #pragma weak identifiers that were never declared
770 LoadExternalWeakUndeclaredIdentifiers();
771 for (auto WeakID : WeakUndeclaredIdentifiers) {
772 if (WeakID.second.getUsed())
775 Decl *PrevDecl = LookupSingleName(TUScope, WeakID.first, SourceLocation(),
777 if (PrevDecl != nullptr &&
778 !(isa<FunctionDecl>(PrevDecl) || isa<VarDecl>(PrevDecl)))
779 Diag(WeakID.second.getLocation(), diag::warn_attribute_wrong_decl_type)
780 << "'weak'" << ExpectedVariableOrFunction;
782 Diag(WeakID.second.getLocation(), diag::warn_weak_identifier_undeclared)
786 if (LangOpts.CPlusPlus11 &&
787 !Diags.isIgnored(diag::warn_delegating_ctor_cycle, SourceLocation()))
788 CheckDelegatingCtorCycles();
790 if (!Diags.hasErrorOccurred()) {
792 ExternalSource->ReadUndefinedButUsed(UndefinedButUsed);
793 checkUndefinedButUsed(*this);
796 if (TUKind == TU_Module) {
797 // If we are building a module, resolve all of the exported declarations
799 if (Module *CurrentModule = PP.getCurrentModule()) {
800 ModuleMap &ModMap = PP.getHeaderSearchInfo().getModuleMap();
802 SmallVector<Module *, 2> Stack;
803 Stack.push_back(CurrentModule);
804 while (!Stack.empty()) {
805 Module *Mod = Stack.pop_back_val();
807 // Resolve the exported declarations and conflicts.
808 // FIXME: Actually complain, once we figure out how to teach the
809 // diagnostic client to deal with complaints in the module map at this
811 ModMap.resolveExports(Mod, /*Complain=*/false);
812 ModMap.resolveUses(Mod, /*Complain=*/false);
813 ModMap.resolveConflicts(Mod, /*Complain=*/false);
815 // Queue the submodules, so their exports will also be resolved.
816 Stack.append(Mod->submodule_begin(), Mod->submodule_end());
820 // Warnings emitted in ActOnEndOfTranslationUnit() should be emitted for
821 // modules when they are built, not every time they are used.
822 emitAndClearUnusedLocalTypedefWarnings();
824 // Modules don't need any of the checking below.
830 // A declaration of an identifier for an object that has file
831 // scope without an initializer, and without a storage-class
832 // specifier or with the storage-class specifier static,
833 // constitutes a tentative definition. If a translation unit
834 // contains one or more tentative definitions for an identifier,
835 // and the translation unit contains no external definition for
836 // that identifier, then the behavior is exactly as if the
837 // translation unit contains a file scope declaration of that
838 // identifier, with the composite type as of the end of the
839 // translation unit, with an initializer equal to 0.
840 llvm::SmallSet<VarDecl *, 32> Seen;
841 for (TentativeDefinitionsType::iterator
842 T = TentativeDefinitions.begin(ExternalSource),
843 TEnd = TentativeDefinitions.end();
846 VarDecl *VD = (*T)->getActingDefinition();
848 // If the tentative definition was completed, getActingDefinition() returns
849 // null. If we've already seen this variable before, insert()'s second
850 // return value is false.
851 if (!VD || VD->isInvalidDecl() || !Seen.insert(VD).second)
854 if (const IncompleteArrayType *ArrayT
855 = Context.getAsIncompleteArrayType(VD->getType())) {
856 // Set the length of the array to 1 (C99 6.9.2p5).
857 Diag(VD->getLocation(), diag::warn_tentative_incomplete_array);
858 llvm::APInt One(Context.getTypeSize(Context.getSizeType()), true);
859 QualType T = Context.getConstantArrayType(ArrayT->getElementType(),
860 One, ArrayType::Normal, 0);
862 } else if (RequireCompleteType(VD->getLocation(), VD->getType(),
863 diag::err_tentative_def_incomplete_type))
864 VD->setInvalidDecl();
866 // No initialization is performed for a tentative definition.
867 CheckCompleteVariableDeclaration(VD);
869 // Notify the consumer that we've completed a tentative definition.
870 if (!VD->isInvalidDecl())
871 Consumer.CompleteTentativeDefinition(VD);
875 // If there were errors, disable 'unused' warnings since they will mostly be
877 if (!Diags.hasErrorOccurred()) {
878 // Output warning for unused file scoped decls.
879 for (UnusedFileScopedDeclsType::iterator
880 I = UnusedFileScopedDecls.begin(ExternalSource),
881 E = UnusedFileScopedDecls.end(); I != E; ++I) {
882 if (ShouldRemoveFromUnused(this, *I))
885 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(*I)) {
886 const FunctionDecl *DiagD;
887 if (!FD->hasBody(DiagD))
889 if (DiagD->isDeleted())
890 continue; // Deleted functions are supposed to be unused.
891 if (DiagD->isReferenced()) {
892 if (isa<CXXMethodDecl>(DiagD))
893 Diag(DiagD->getLocation(), diag::warn_unneeded_member_function)
894 << DiagD->getDeclName();
896 if (FD->getStorageClass() == SC_Static &&
897 !FD->isInlineSpecified() &&
898 !SourceMgr.isInMainFile(
899 SourceMgr.getExpansionLoc(FD->getLocation())))
900 Diag(DiagD->getLocation(),
901 diag::warn_unneeded_static_internal_decl)
902 << DiagD->getDeclName();
904 Diag(DiagD->getLocation(), diag::warn_unneeded_internal_decl)
905 << /*function*/0 << DiagD->getDeclName();
908 Diag(DiagD->getLocation(),
909 isa<CXXMethodDecl>(DiagD) ? diag::warn_unused_member_function
910 : diag::warn_unused_function)
911 << DiagD->getDeclName();
914 const VarDecl *DiagD = cast<VarDecl>(*I)->getDefinition();
916 DiagD = cast<VarDecl>(*I);
917 if (DiagD->isReferenced()) {
918 Diag(DiagD->getLocation(), diag::warn_unneeded_internal_decl)
919 << /*variable*/1 << DiagD->getDeclName();
920 } else if (DiagD->getType().isConstQualified()) {
921 const SourceManager &SM = SourceMgr;
922 if (SM.getMainFileID() != SM.getFileID(DiagD->getLocation()) ||
923 !PP.getLangOpts().IsHeaderFile)
924 Diag(DiagD->getLocation(), diag::warn_unused_const_variable)
925 << DiagD->getDeclName();
927 Diag(DiagD->getLocation(), diag::warn_unused_variable)
928 << DiagD->getDeclName();
933 emitAndClearUnusedLocalTypedefWarnings();
936 if (!Diags.isIgnored(diag::warn_unused_private_field, SourceLocation())) {
937 RecordCompleteMap RecordsComplete;
938 RecordCompleteMap MNCComplete;
939 for (NamedDeclSetType::iterator I = UnusedPrivateFields.begin(),
940 E = UnusedPrivateFields.end(); I != E; ++I) {
941 const NamedDecl *D = *I;
942 const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(D->getDeclContext());
943 if (RD && !RD->isUnion() &&
944 IsRecordFullyDefined(RD, RecordsComplete, MNCComplete)) {
945 Diag(D->getLocation(), diag::warn_unused_private_field)
951 if (!Diags.isIgnored(diag::warn_mismatched_delete_new, SourceLocation())) {
953 ExternalSource->ReadMismatchingDeleteExpressions(DeleteExprs);
954 for (const auto &DeletedFieldInfo : DeleteExprs) {
955 for (const auto &DeleteExprLoc : DeletedFieldInfo.second) {
956 AnalyzeDeleteExprMismatch(DeletedFieldInfo.first, DeleteExprLoc.first,
957 DeleteExprLoc.second);
962 // Check we've noticed that we're no longer parsing the initializer for every
963 // variable. If we miss cases, then at best we have a performance issue and
964 // at worst a rejects-valid bug.
965 assert(ParsingInitForAutoVars.empty() &&
966 "Didn't unmark var as having its initializer parsed");
968 if (!PP.isIncrementalProcessingEnabled())
973 //===----------------------------------------------------------------------===//
975 //===----------------------------------------------------------------------===//
977 DeclContext *Sema::getFunctionLevelDeclContext() {
978 DeclContext *DC = CurContext;
981 if (isa<BlockDecl>(DC) || isa<EnumDecl>(DC) || isa<CapturedDecl>(DC)) {
982 DC = DC->getParent();
983 } else if (isa<CXXMethodDecl>(DC) &&
984 cast<CXXMethodDecl>(DC)->getOverloadedOperator() == OO_Call &&
985 cast<CXXRecordDecl>(DC->getParent())->isLambda()) {
986 DC = DC->getParent()->getParent();
994 /// getCurFunctionDecl - If inside of a function body, this returns a pointer
995 /// to the function decl for the function being parsed. If we're currently
996 /// in a 'block', this returns the containing context.
997 FunctionDecl *Sema::getCurFunctionDecl() {
998 DeclContext *DC = getFunctionLevelDeclContext();
999 return dyn_cast<FunctionDecl>(DC);
1002 ObjCMethodDecl *Sema::getCurMethodDecl() {
1003 DeclContext *DC = getFunctionLevelDeclContext();
1004 while (isa<RecordDecl>(DC))
1005 DC = DC->getParent();
1006 return dyn_cast<ObjCMethodDecl>(DC);
1009 NamedDecl *Sema::getCurFunctionOrMethodDecl() {
1010 DeclContext *DC = getFunctionLevelDeclContext();
1011 if (isa<ObjCMethodDecl>(DC) || isa<FunctionDecl>(DC))
1012 return cast<NamedDecl>(DC);
1016 void Sema::EmitCurrentDiagnostic(unsigned DiagID) {
1017 // FIXME: It doesn't make sense to me that DiagID is an incoming argument here
1018 // and yet we also use the current diag ID on the DiagnosticsEngine. This has
1019 // been made more painfully obvious by the refactor that introduced this
1020 // function, but it is possible that the incoming argument can be
1021 // eliminated. If it truly cannot be (for example, there is some reentrancy
1022 // issue I am not seeing yet), then there should at least be a clarifying
1023 // comment somewhere.
1024 if (Optional<TemplateDeductionInfo*> Info = isSFINAEContext()) {
1025 switch (DiagnosticIDs::getDiagnosticSFINAEResponse(
1026 Diags.getCurrentDiagID())) {
1027 case DiagnosticIDs::SFINAE_Report:
1028 // We'll report the diagnostic below.
1031 case DiagnosticIDs::SFINAE_SubstitutionFailure:
1032 // Count this failure so that we know that template argument deduction
1036 // Make a copy of this suppressed diagnostic and store it with the
1037 // template-deduction information.
1038 if (*Info && !(*Info)->hasSFINAEDiagnostic()) {
1039 Diagnostic DiagInfo(&Diags);
1040 (*Info)->addSFINAEDiagnostic(DiagInfo.getLocation(),
1041 PartialDiagnostic(DiagInfo, Context.getDiagAllocator()));
1044 Diags.setLastDiagnosticIgnored();
1048 case DiagnosticIDs::SFINAE_AccessControl: {
1049 // Per C++ Core Issue 1170, access control is part of SFINAE.
1050 // Additionally, the AccessCheckingSFINAE flag can be used to temporarily
1051 // make access control a part of SFINAE for the purposes of checking
1053 if (!AccessCheckingSFINAE && !getLangOpts().CPlusPlus11)
1056 SourceLocation Loc = Diags.getCurrentDiagLoc();
1058 // Suppress this diagnostic.
1061 // Make a copy of this suppressed diagnostic and store it with the
1062 // template-deduction information.
1063 if (*Info && !(*Info)->hasSFINAEDiagnostic()) {
1064 Diagnostic DiagInfo(&Diags);
1065 (*Info)->addSFINAEDiagnostic(DiagInfo.getLocation(),
1066 PartialDiagnostic(DiagInfo, Context.getDiagAllocator()));
1069 Diags.setLastDiagnosticIgnored();
1072 // Now the diagnostic state is clear, produce a C++98 compatibility
1074 Diag(Loc, diag::warn_cxx98_compat_sfinae_access_control);
1076 // The last diagnostic which Sema produced was ignored. Suppress any
1077 // notes attached to it.
1078 Diags.setLastDiagnosticIgnored();
1082 case DiagnosticIDs::SFINAE_Suppress:
1083 // Make a copy of this suppressed diagnostic and store it with the
1084 // template-deduction information;
1086 Diagnostic DiagInfo(&Diags);
1087 (*Info)->addSuppressedDiagnostic(DiagInfo.getLocation(),
1088 PartialDiagnostic(DiagInfo, Context.getDiagAllocator()));
1091 // Suppress this diagnostic.
1092 Diags.setLastDiagnosticIgnored();
1098 // Set up the context's printing policy based on our current state.
1099 Context.setPrintingPolicy(getPrintingPolicy());
1101 // Emit the diagnostic.
1102 if (!Diags.EmitCurrentDiagnostic())
1105 // If this is not a note, and we're in a template instantiation
1106 // that is different from the last template instantiation where
1107 // we emitted an error, print a template instantiation
1109 if (!DiagnosticIDs::isBuiltinNote(DiagID))
1110 PrintContextStack();
1113 Sema::SemaDiagnosticBuilder
1114 Sema::Diag(SourceLocation Loc, const PartialDiagnostic& PD) {
1115 SemaDiagnosticBuilder Builder(Diag(Loc, PD.getDiagID()));
1121 /// \brief Looks through the macro-expansion chain for the given
1122 /// location, looking for a macro expansion with the given name.
1123 /// If one is found, returns true and sets the location to that
1125 bool Sema::findMacroSpelling(SourceLocation &locref, StringRef name) {
1126 SourceLocation loc = locref;
1127 if (!loc.isMacroID()) return false;
1129 // There's no good way right now to look at the intermediate
1130 // expansions, so just jump to the expansion location.
1131 loc = getSourceManager().getExpansionLoc(loc);
1133 // If that's written with the name, stop here.
1134 SmallVector<char, 16> buffer;
1135 if (getPreprocessor().getSpelling(loc, buffer) == name) {
1142 /// \brief Determines the active Scope associated with the given declaration
1145 /// This routine maps a declaration context to the active Scope object that
1146 /// represents that declaration context in the parser. It is typically used
1147 /// from "scope-less" code (e.g., template instantiation, lazy creation of
1148 /// declarations) that injects a name for name-lookup purposes and, therefore,
1149 /// must update the Scope.
1151 /// \returns The scope corresponding to the given declaraion context, or NULL
1152 /// if no such scope is open.
1153 Scope *Sema::getScopeForContext(DeclContext *Ctx) {
1158 Ctx = Ctx->getPrimaryContext();
1159 for (Scope *S = getCurScope(); S; S = S->getParent()) {
1160 // Ignore scopes that cannot have declarations. This is important for
1161 // out-of-line definitions of static class members.
1162 if (S->getFlags() & (Scope::DeclScope | Scope::TemplateParamScope))
1163 if (DeclContext *Entity = S->getEntity())
1164 if (Ctx == Entity->getPrimaryContext())
1171 /// \brief Enter a new function scope
1172 void Sema::PushFunctionScope() {
1173 if (FunctionScopes.size() == 1) {
1174 // Use the "top" function scope rather than having to allocate
1175 // memory for a new scope.
1176 FunctionScopes.back()->Clear();
1177 FunctionScopes.push_back(FunctionScopes.back());
1178 if (LangOpts.OpenMP)
1179 pushOpenMPFunctionRegion();
1183 FunctionScopes.push_back(new FunctionScopeInfo(getDiagnostics()));
1184 if (LangOpts.OpenMP)
1185 pushOpenMPFunctionRegion();
1188 void Sema::PushBlockScope(Scope *BlockScope, BlockDecl *Block) {
1189 FunctionScopes.push_back(new BlockScopeInfo(getDiagnostics(),
1190 BlockScope, Block));
1193 LambdaScopeInfo *Sema::PushLambdaScope() {
1194 LambdaScopeInfo *const LSI = new LambdaScopeInfo(getDiagnostics());
1195 FunctionScopes.push_back(LSI);
1199 void Sema::RecordParsingTemplateParameterDepth(unsigned Depth) {
1200 if (LambdaScopeInfo *const LSI = getCurLambda()) {
1201 LSI->AutoTemplateParameterDepth = Depth;
1205 "Remove assertion if intentionally called in a non-lambda context.");
1208 void Sema::PopFunctionScopeInfo(const AnalysisBasedWarnings::Policy *WP,
1209 const Decl *D, const BlockExpr *blkExpr) {
1210 FunctionScopeInfo *Scope = FunctionScopes.pop_back_val();
1211 assert(!FunctionScopes.empty() && "mismatched push/pop!");
1213 if (LangOpts.OpenMP)
1214 popOpenMPFunctionRegion(Scope);
1216 // Issue any analysis-based warnings.
1218 AnalysisWarnings.IssueWarnings(*WP, Scope, D, blkExpr);
1220 for (const auto &PUD : Scope->PossiblyUnreachableDiags)
1221 Diag(PUD.Loc, PUD.PD);
1223 if (FunctionScopes.back() != Scope)
1227 void Sema::PushCompoundScope() {
1228 getCurFunction()->CompoundScopes.push_back(CompoundScopeInfo());
1231 void Sema::PopCompoundScope() {
1232 FunctionScopeInfo *CurFunction = getCurFunction();
1233 assert(!CurFunction->CompoundScopes.empty() && "mismatched push/pop");
1235 CurFunction->CompoundScopes.pop_back();
1238 /// \brief Determine whether any errors occurred within this function/method/
1240 bool Sema::hasAnyUnrecoverableErrorsInThisFunction() const {
1241 return getCurFunction()->ErrorTrap.hasUnrecoverableErrorOccurred();
1244 BlockScopeInfo *Sema::getCurBlock() {
1245 if (FunctionScopes.empty())
1248 auto CurBSI = dyn_cast<BlockScopeInfo>(FunctionScopes.back());
1249 if (CurBSI && CurBSI->TheDecl &&
1250 !CurBSI->TheDecl->Encloses(CurContext)) {
1251 // We have switched contexts due to template instantiation.
1252 assert(!CodeSynthesisContexts.empty());
1259 LambdaScopeInfo *Sema::getCurLambda(bool IgnoreNonLambdaCapturingScope) {
1260 if (FunctionScopes.empty())
1263 auto I = FunctionScopes.rbegin();
1264 if (IgnoreNonLambdaCapturingScope) {
1265 auto E = FunctionScopes.rend();
1266 while (I != E && isa<CapturingScopeInfo>(*I) && !isa<LambdaScopeInfo>(*I))
1271 auto *CurLSI = dyn_cast<LambdaScopeInfo>(*I);
1272 if (CurLSI && CurLSI->Lambda &&
1273 !CurLSI->Lambda->Encloses(CurContext)) {
1274 // We have switched contexts due to template instantiation.
1275 assert(!CodeSynthesisContexts.empty());
1281 // We have a generic lambda if we parsed auto parameters, or we have
1282 // an associated template parameter list.
1283 LambdaScopeInfo *Sema::getCurGenericLambda() {
1284 if (LambdaScopeInfo *LSI = getCurLambda()) {
1285 return (LSI->AutoTemplateParams.size() ||
1286 LSI->GLTemplateParameterList) ? LSI : nullptr;
1292 void Sema::ActOnComment(SourceRange Comment) {
1293 if (!LangOpts.RetainCommentsFromSystemHeaders &&
1294 SourceMgr.isInSystemHeader(Comment.getBegin()))
1296 RawComment RC(SourceMgr, Comment, false,
1297 LangOpts.CommentOpts.ParseAllComments);
1298 if (RC.isAlmostTrailingComment()) {
1299 SourceRange MagicMarkerRange(Comment.getBegin(),
1300 Comment.getBegin().getLocWithOffset(3));
1301 StringRef MagicMarkerText;
1302 switch (RC.getKind()) {
1303 case RawComment::RCK_OrdinaryBCPL:
1304 MagicMarkerText = "///<";
1306 case RawComment::RCK_OrdinaryC:
1307 MagicMarkerText = "/**<";
1310 llvm_unreachable("if this is an almost Doxygen comment, "
1311 "it should be ordinary");
1313 Diag(Comment.getBegin(), diag::warn_not_a_doxygen_trailing_member_comment) <<
1314 FixItHint::CreateReplacement(MagicMarkerRange, MagicMarkerText);
1316 Context.addComment(RC);
1319 // Pin this vtable to this file.
1320 ExternalSemaSource::~ExternalSemaSource() {}
1322 void ExternalSemaSource::ReadMethodPool(Selector Sel) { }
1323 void ExternalSemaSource::updateOutOfDateSelector(Selector Sel) { }
1325 void ExternalSemaSource::ReadKnownNamespaces(
1326 SmallVectorImpl<NamespaceDecl *> &Namespaces) {
1329 void ExternalSemaSource::ReadUndefinedButUsed(
1330 llvm::MapVector<NamedDecl *, SourceLocation> &Undefined) {}
1332 void ExternalSemaSource::ReadMismatchingDeleteExpressions(llvm::MapVector<
1333 FieldDecl *, llvm::SmallVector<std::pair<SourceLocation, bool>, 4>> &) {}
1335 void PrettyDeclStackTraceEntry::print(raw_ostream &OS) const {
1336 SourceLocation Loc = this->Loc;
1337 if (!Loc.isValid() && TheDecl) Loc = TheDecl->getLocation();
1338 if (Loc.isValid()) {
1339 Loc.print(OS, S.getSourceManager());
1344 if (auto *ND = dyn_cast_or_null<NamedDecl>(TheDecl)) {
1346 ND->getNameForDiagnostic(OS, ND->getASTContext().getPrintingPolicy(), true);
1353 /// \brief Figure out if an expression could be turned into a call.
1355 /// Use this when trying to recover from an error where the programmer may have
1356 /// written just the name of a function instead of actually calling it.
1358 /// \param E - The expression to examine.
1359 /// \param ZeroArgCallReturnTy - If the expression can be turned into a call
1360 /// with no arguments, this parameter is set to the type returned by such a
1361 /// call; otherwise, it is set to an empty QualType.
1362 /// \param OverloadSet - If the expression is an overloaded function
1363 /// name, this parameter is populated with the decls of the various overloads.
1364 bool Sema::tryExprAsCall(Expr &E, QualType &ZeroArgCallReturnTy,
1365 UnresolvedSetImpl &OverloadSet) {
1366 ZeroArgCallReturnTy = QualType();
1367 OverloadSet.clear();
1369 const OverloadExpr *Overloads = nullptr;
1370 bool IsMemExpr = false;
1371 if (E.getType() == Context.OverloadTy) {
1372 OverloadExpr::FindResult FR = OverloadExpr::find(const_cast<Expr*>(&E));
1374 // Ignore overloads that are pointer-to-member constants.
1375 if (FR.HasFormOfMemberPointer)
1378 Overloads = FR.Expression;
1379 } else if (E.getType() == Context.BoundMemberTy) {
1380 Overloads = dyn_cast<UnresolvedMemberExpr>(E.IgnoreParens());
1384 bool Ambiguous = false;
1387 for (OverloadExpr::decls_iterator it = Overloads->decls_begin(),
1388 DeclsEnd = Overloads->decls_end(); it != DeclsEnd; ++it) {
1389 OverloadSet.addDecl(*it);
1391 // Check whether the function is a non-template, non-member which takes no
1395 if (const FunctionDecl *OverloadDecl
1396 = dyn_cast<FunctionDecl>((*it)->getUnderlyingDecl())) {
1397 if (OverloadDecl->getMinRequiredArguments() == 0) {
1398 if (!ZeroArgCallReturnTy.isNull() && !Ambiguous) {
1399 ZeroArgCallReturnTy = QualType();
1402 ZeroArgCallReturnTy = OverloadDecl->getReturnType();
1407 // If it's not a member, use better machinery to try to resolve the call
1409 return !ZeroArgCallReturnTy.isNull();
1412 // Attempt to call the member with no arguments - this will correctly handle
1413 // member templates with defaults/deduction of template arguments, overloads
1414 // with default arguments, etc.
1415 if (IsMemExpr && !E.isTypeDependent()) {
1416 bool Suppress = getDiagnostics().getSuppressAllDiagnostics();
1417 getDiagnostics().setSuppressAllDiagnostics(true);
1418 ExprResult R = BuildCallToMemberFunction(nullptr, &E, SourceLocation(),
1419 None, SourceLocation());
1420 getDiagnostics().setSuppressAllDiagnostics(Suppress);
1422 ZeroArgCallReturnTy = R.get()->getType();
1428 if (const DeclRefExpr *DeclRef = dyn_cast<DeclRefExpr>(E.IgnoreParens())) {
1429 if (const FunctionDecl *Fun = dyn_cast<FunctionDecl>(DeclRef->getDecl())) {
1430 if (Fun->getMinRequiredArguments() == 0)
1431 ZeroArgCallReturnTy = Fun->getReturnType();
1436 // We don't have an expression that's convenient to get a FunctionDecl from,
1437 // but we can at least check if the type is "function of 0 arguments".
1438 QualType ExprTy = E.getType();
1439 const FunctionType *FunTy = nullptr;
1440 QualType PointeeTy = ExprTy->getPointeeType();
1441 if (!PointeeTy.isNull())
1442 FunTy = PointeeTy->getAs<FunctionType>();
1444 FunTy = ExprTy->getAs<FunctionType>();
1446 if (const FunctionProtoType *FPT =
1447 dyn_cast_or_null<FunctionProtoType>(FunTy)) {
1448 if (FPT->getNumParams() == 0)
1449 ZeroArgCallReturnTy = FunTy->getReturnType();
1455 /// \brief Give notes for a set of overloads.
1457 /// A companion to tryExprAsCall. In cases when the name that the programmer
1458 /// wrote was an overloaded function, we may be able to make some guesses about
1459 /// plausible overloads based on their return types; such guesses can be handed
1460 /// off to this method to be emitted as notes.
1462 /// \param Overloads - The overloads to note.
1463 /// \param FinalNoteLoc - If we've suppressed printing some overloads due to
1464 /// -fshow-overloads=best, this is the location to attach to the note about too
1465 /// many candidates. Typically this will be the location of the original
1466 /// ill-formed expression.
1467 static void noteOverloads(Sema &S, const UnresolvedSetImpl &Overloads,
1468 const SourceLocation FinalNoteLoc) {
1469 int ShownOverloads = 0;
1470 int SuppressedOverloads = 0;
1471 for (UnresolvedSetImpl::iterator It = Overloads.begin(),
1472 DeclsEnd = Overloads.end(); It != DeclsEnd; ++It) {
1473 // FIXME: Magic number for max shown overloads stolen from
1474 // OverloadCandidateSet::NoteCandidates.
1475 if (ShownOverloads >= 4 && S.Diags.getShowOverloads() == Ovl_Best) {
1476 ++SuppressedOverloads;
1480 NamedDecl *Fn = (*It)->getUnderlyingDecl();
1481 S.Diag(Fn->getLocation(), diag::note_possible_target_of_call);
1485 if (SuppressedOverloads)
1486 S.Diag(FinalNoteLoc, diag::note_ovl_too_many_candidates)
1487 << SuppressedOverloads;
1490 static void notePlausibleOverloads(Sema &S, SourceLocation Loc,
1491 const UnresolvedSetImpl &Overloads,
1492 bool (*IsPlausibleResult)(QualType)) {
1493 if (!IsPlausibleResult)
1494 return noteOverloads(S, Overloads, Loc);
1496 UnresolvedSet<2> PlausibleOverloads;
1497 for (OverloadExpr::decls_iterator It = Overloads.begin(),
1498 DeclsEnd = Overloads.end(); It != DeclsEnd; ++It) {
1499 const FunctionDecl *OverloadDecl = cast<FunctionDecl>(*It);
1500 QualType OverloadResultTy = OverloadDecl->getReturnType();
1501 if (IsPlausibleResult(OverloadResultTy))
1502 PlausibleOverloads.addDecl(It.getDecl());
1504 noteOverloads(S, PlausibleOverloads, Loc);
1507 /// Determine whether the given expression can be called by just
1508 /// putting parentheses after it. Notably, expressions with unary
1509 /// operators can't be because the unary operator will start parsing
1510 /// outside the call.
1511 static bool IsCallableWithAppend(Expr *E) {
1512 E = E->IgnoreImplicit();
1513 return (!isa<CStyleCastExpr>(E) &&
1514 !isa<UnaryOperator>(E) &&
1515 !isa<BinaryOperator>(E) &&
1516 !isa<CXXOperatorCallExpr>(E));
1519 bool Sema::tryToRecoverWithCall(ExprResult &E, const PartialDiagnostic &PD,
1521 bool (*IsPlausibleResult)(QualType)) {
1522 SourceLocation Loc = E.get()->getExprLoc();
1523 SourceRange Range = E.get()->getSourceRange();
1525 QualType ZeroArgCallTy;
1526 UnresolvedSet<4> Overloads;
1527 if (tryExprAsCall(*E.get(), ZeroArgCallTy, Overloads) &&
1528 !ZeroArgCallTy.isNull() &&
1529 (!IsPlausibleResult || IsPlausibleResult(ZeroArgCallTy))) {
1530 // At this point, we know E is potentially callable with 0
1531 // arguments and that it returns something of a reasonable type,
1532 // so we can emit a fixit and carry on pretending that E was
1533 // actually a CallExpr.
1534 SourceLocation ParenInsertionLoc = getLocForEndOfToken(Range.getEnd());
1536 << /*zero-arg*/ 1 << Range
1537 << (IsCallableWithAppend(E.get())
1538 ? FixItHint::CreateInsertion(ParenInsertionLoc, "()")
1540 notePlausibleOverloads(*this, Loc, Overloads, IsPlausibleResult);
1542 // FIXME: Try this before emitting the fixit, and suppress diagnostics
1544 E = ActOnCallExpr(nullptr, E.get(), Range.getEnd(), None,
1545 Range.getEnd().getLocWithOffset(1));
1549 if (!ForceComplain) return false;
1551 Diag(Loc, PD) << /*not zero-arg*/ 0 << Range;
1552 notePlausibleOverloads(*this, Loc, Overloads, IsPlausibleResult);
1557 IdentifierInfo *Sema::getSuperIdentifier() const {
1559 Ident_super = &Context.Idents.get("super");
1563 IdentifierInfo *Sema::getFloat128Identifier() const {
1564 if (!Ident___float128)
1565 Ident___float128 = &Context.Idents.get("__float128");
1566 return Ident___float128;
1569 void Sema::PushCapturedRegionScope(Scope *S, CapturedDecl *CD, RecordDecl *RD,
1570 CapturedRegionKind K) {
1571 CapturingScopeInfo *CSI = new CapturedRegionScopeInfo(
1572 getDiagnostics(), S, CD, RD, CD->getContextParam(), K,
1573 (getLangOpts().OpenMP && K == CR_OpenMP) ? getOpenMPNestingLevel() : 0);
1574 CSI->ReturnType = Context.VoidTy;
1575 FunctionScopes.push_back(CSI);
1578 CapturedRegionScopeInfo *Sema::getCurCapturedRegion() {
1579 if (FunctionScopes.empty())
1582 return dyn_cast<CapturedRegionScopeInfo>(FunctionScopes.back());
1585 const llvm::MapVector<FieldDecl *, Sema::DeleteLocs> &
1586 Sema::getMismatchingDeleteExpressions() const {
1590 void Sema::setOpenCLExtensionForType(QualType T, llvm::StringRef ExtStr) {
1593 llvm::SmallVector<StringRef, 1> Exts;
1594 ExtStr.split(Exts, " ", /* limit */ -1, /* keep empty */ false);
1595 auto CanT = T.getCanonicalType().getTypePtr();
1596 for (auto &I : Exts)
1597 OpenCLTypeExtMap[CanT].insert(I.str());
1600 void Sema::setOpenCLExtensionForDecl(Decl *FD, StringRef ExtStr) {
1601 llvm::SmallVector<StringRef, 1> Exts;
1602 ExtStr.split(Exts, " ", /* limit */ -1, /* keep empty */ false);
1605 for (auto &I : Exts)
1606 OpenCLDeclExtMap[FD].insert(I.str());
1609 void Sema::setCurrentOpenCLExtensionForType(QualType T) {
1610 if (CurrOpenCLExtension.empty())
1612 setOpenCLExtensionForType(T, CurrOpenCLExtension);
1615 void Sema::setCurrentOpenCLExtensionForDecl(Decl *D) {
1616 if (CurrOpenCLExtension.empty())
1618 setOpenCLExtensionForDecl(D, CurrOpenCLExtension);
1621 bool Sema::isOpenCLDisabledDecl(Decl *FD) {
1622 auto Loc = OpenCLDeclExtMap.find(FD);
1623 if (Loc == OpenCLDeclExtMap.end())
1625 for (auto &I : Loc->second) {
1626 if (!getOpenCLOptions().isEnabled(I))
1632 template <typename T, typename DiagLocT, typename DiagInfoT, typename MapT>
1633 bool Sema::checkOpenCLDisabledTypeOrDecl(T D, DiagLocT DiagLoc,
1634 DiagInfoT DiagInfo, MapT &Map,
1636 SourceRange SrcRange) {
1637 auto Loc = Map.find(D);
1638 if (Loc == Map.end())
1640 bool Disabled = false;
1641 for (auto &I : Loc->second) {
1642 if (I != CurrOpenCLExtension && !getOpenCLOptions().isEnabled(I)) {
1643 Diag(DiagLoc, diag::err_opencl_requires_extension) << Selector << DiagInfo
1651 bool Sema::checkOpenCLDisabledTypeDeclSpec(const DeclSpec &DS, QualType QT) {
1652 // Check extensions for declared types.
1653 Decl *Decl = nullptr;
1654 if (auto TypedefT = dyn_cast<TypedefType>(QT.getTypePtr()))
1655 Decl = TypedefT->getDecl();
1656 if (auto TagT = dyn_cast<TagType>(QT.getCanonicalType().getTypePtr()))
1657 Decl = TagT->getDecl();
1658 auto Loc = DS.getTypeSpecTypeLoc();
1659 if (checkOpenCLDisabledTypeOrDecl(Decl, Loc, QT, OpenCLDeclExtMap))
1662 // Check extensions for builtin types.
1663 return checkOpenCLDisabledTypeOrDecl(QT.getCanonicalType().getTypePtr(), Loc,
1664 QT, OpenCLTypeExtMap);
1667 bool Sema::checkOpenCLDisabledDecl(const Decl &D, const Expr &E) {
1668 return checkOpenCLDisabledTypeOrDecl(&D, E.getLocStart(), "",
1669 OpenCLDeclExtMap, 1, D.getSourceRange());