1 //===--- SemaType.cpp - Semantic Analysis for Types -----------------------===//
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 type-related semantic analysis.
12 //===----------------------------------------------------------------------===//
14 #include "clang/Sema/SemaInternal.h"
15 #include "TypeLocBuilder.h"
16 #include "clang/AST/ASTConsumer.h"
17 #include "clang/AST/ASTContext.h"
18 #include "clang/AST/ASTMutationListener.h"
19 #include "clang/AST/CXXInheritance.h"
20 #include "clang/AST/DeclObjC.h"
21 #include "clang/AST/DeclTemplate.h"
22 #include "clang/AST/Expr.h"
23 #include "clang/AST/TypeLoc.h"
24 #include "clang/AST/TypeLocVisitor.h"
25 #include "clang/Basic/PartialDiagnostic.h"
26 #include "clang/Basic/TargetInfo.h"
27 #include "clang/Parse/ParseDiagnostic.h"
28 #include "clang/Sema/DeclSpec.h"
29 #include "clang/Sema/DelayedDiagnostic.h"
30 #include "clang/Sema/Lookup.h"
31 #include "clang/Sema/ScopeInfo.h"
32 #include "clang/Sema/Template.h"
33 #include "llvm/ADT/SmallPtrSet.h"
34 #include "llvm/ADT/SmallString.h"
35 #include "llvm/Support/ErrorHandling.h"
37 using namespace clang;
39 enum TypeDiagSelector {
45 /// isOmittedBlockReturnType - Return true if this declarator is missing a
46 /// return type because this is a omitted return type on a block literal.
47 static bool isOmittedBlockReturnType(const Declarator &D) {
48 if (D.getContext() != Declarator::BlockLiteralContext ||
49 D.getDeclSpec().hasTypeSpecifier())
52 if (D.getNumTypeObjects() == 0)
53 return true; // ^{ ... }
55 if (D.getNumTypeObjects() == 1 &&
56 D.getTypeObject(0).Kind == DeclaratorChunk::Function)
57 return true; // ^(int X, float Y) { ... }
62 /// diagnoseBadTypeAttribute - Diagnoses a type attribute which
63 /// doesn't apply to the given type.
64 static void diagnoseBadTypeAttribute(Sema &S, const AttributeList &attr,
66 TypeDiagSelector WhichType;
67 bool useExpansionLoc = true;
68 switch (attr.getKind()) {
69 case AttributeList::AT_ObjCGC: WhichType = TDS_Pointer; break;
70 case AttributeList::AT_ObjCOwnership: WhichType = TDS_ObjCObjOrBlock; break;
72 // Assume everything else was a function attribute.
73 WhichType = TDS_Function;
74 useExpansionLoc = false;
78 SourceLocation loc = attr.getLoc();
79 StringRef name = attr.getName()->getName();
81 // The GC attributes are usually written with macros; special-case them.
82 IdentifierInfo *II = attr.isArgIdent(0) ? attr.getArgAsIdent(0)->Ident
84 if (useExpansionLoc && loc.isMacroID() && II) {
85 if (II->isStr("strong")) {
86 if (S.findMacroSpelling(loc, "__strong")) name = "__strong";
87 } else if (II->isStr("weak")) {
88 if (S.findMacroSpelling(loc, "__weak")) name = "__weak";
92 S.Diag(loc, diag::warn_type_attribute_wrong_type) << name << WhichType
96 // objc_gc applies to Objective-C pointers or, otherwise, to the
97 // smallest available pointer type (i.e. 'void*' in 'void**').
98 #define OBJC_POINTER_TYPE_ATTRS_CASELIST \
99 case AttributeList::AT_ObjCGC: \
100 case AttributeList::AT_ObjCOwnership
102 // Function type attributes.
103 #define FUNCTION_TYPE_ATTRS_CASELIST \
104 case AttributeList::AT_NoReturn: \
105 case AttributeList::AT_CDecl: \
106 case AttributeList::AT_FastCall: \
107 case AttributeList::AT_StdCall: \
108 case AttributeList::AT_ThisCall: \
109 case AttributeList::AT_Pascal: \
110 case AttributeList::AT_VectorCall: \
111 case AttributeList::AT_MSABI: \
112 case AttributeList::AT_SysVABI: \
113 case AttributeList::AT_Regparm: \
114 case AttributeList::AT_Pcs: \
115 case AttributeList::AT_IntelOclBicc
117 // Microsoft-specific type qualifiers.
118 #define MS_TYPE_ATTRS_CASELIST \
119 case AttributeList::AT_Ptr32: \
120 case AttributeList::AT_Ptr64: \
121 case AttributeList::AT_SPtr: \
122 case AttributeList::AT_UPtr
125 /// An object which stores processing state for the entire
126 /// GetTypeForDeclarator process.
127 class TypeProcessingState {
130 /// The declarator being processed.
131 Declarator &declarator;
133 /// The index of the declarator chunk we're currently processing.
134 /// May be the total number of valid chunks, indicating the
138 /// Whether there are non-trivial modifications to the decl spec.
141 /// Whether we saved the attributes in the decl spec.
144 /// The original set of attributes on the DeclSpec.
145 SmallVector<AttributeList*, 2> savedAttrs;
147 /// A list of attributes to diagnose the uselessness of when the
148 /// processing is complete.
149 SmallVector<AttributeList*, 2> ignoredTypeAttrs;
152 TypeProcessingState(Sema &sema, Declarator &declarator)
153 : sema(sema), declarator(declarator),
154 chunkIndex(declarator.getNumTypeObjects()),
155 trivial(true), hasSavedAttrs(false) {}
157 Sema &getSema() const {
161 Declarator &getDeclarator() const {
165 bool isProcessingDeclSpec() const {
166 return chunkIndex == declarator.getNumTypeObjects();
169 unsigned getCurrentChunkIndex() const {
173 void setCurrentChunkIndex(unsigned idx) {
174 assert(idx <= declarator.getNumTypeObjects());
178 AttributeList *&getCurrentAttrListRef() const {
179 if (isProcessingDeclSpec())
180 return getMutableDeclSpec().getAttributes().getListRef();
181 return declarator.getTypeObject(chunkIndex).getAttrListRef();
184 /// Save the current set of attributes on the DeclSpec.
185 void saveDeclSpecAttrs() {
186 // Don't try to save them multiple times.
187 if (hasSavedAttrs) return;
189 DeclSpec &spec = getMutableDeclSpec();
190 for (AttributeList *attr = spec.getAttributes().getList(); attr;
191 attr = attr->getNext())
192 savedAttrs.push_back(attr);
193 trivial &= savedAttrs.empty();
194 hasSavedAttrs = true;
197 /// Record that we had nowhere to put the given type attribute.
198 /// We will diagnose such attributes later.
199 void addIgnoredTypeAttr(AttributeList &attr) {
200 ignoredTypeAttrs.push_back(&attr);
203 /// Diagnose all the ignored type attributes, given that the
204 /// declarator worked out to the given type.
205 void diagnoseIgnoredTypeAttrs(QualType type) const {
206 for (SmallVectorImpl<AttributeList*>::const_iterator
207 i = ignoredTypeAttrs.begin(), e = ignoredTypeAttrs.end();
209 diagnoseBadTypeAttribute(getSema(), **i, type);
212 ~TypeProcessingState() {
215 restoreDeclSpecAttrs();
219 DeclSpec &getMutableDeclSpec() const {
220 return const_cast<DeclSpec&>(declarator.getDeclSpec());
223 void restoreDeclSpecAttrs() {
224 assert(hasSavedAttrs);
226 if (savedAttrs.empty()) {
227 getMutableDeclSpec().getAttributes().set(nullptr);
231 getMutableDeclSpec().getAttributes().set(savedAttrs[0]);
232 for (unsigned i = 0, e = savedAttrs.size() - 1; i != e; ++i)
233 savedAttrs[i]->setNext(savedAttrs[i+1]);
234 savedAttrs.back()->setNext(nullptr);
239 static void spliceAttrIntoList(AttributeList &attr, AttributeList *&head) {
244 static void spliceAttrOutOfList(AttributeList &attr, AttributeList *&head) {
246 head = attr.getNext();
250 AttributeList *cur = head;
252 assert(cur && cur->getNext() && "ran out of attrs?");
253 if (cur->getNext() == &attr) {
254 cur->setNext(attr.getNext());
257 cur = cur->getNext();
261 static void moveAttrFromListToList(AttributeList &attr,
262 AttributeList *&fromList,
263 AttributeList *&toList) {
264 spliceAttrOutOfList(attr, fromList);
265 spliceAttrIntoList(attr, toList);
268 /// The location of a type attribute.
269 enum TypeAttrLocation {
270 /// The attribute is in the decl-specifier-seq.
272 /// The attribute is part of a DeclaratorChunk.
274 /// The attribute is immediately after the declaration's name.
278 static void processTypeAttrs(TypeProcessingState &state,
279 QualType &type, TypeAttrLocation TAL,
280 AttributeList *attrs);
282 static bool handleFunctionTypeAttr(TypeProcessingState &state,
286 static bool handleMSPointerTypeQualifierAttr(TypeProcessingState &state,
290 static bool handleObjCGCTypeAttr(TypeProcessingState &state,
291 AttributeList &attr, QualType &type);
293 static bool handleObjCOwnershipTypeAttr(TypeProcessingState &state,
294 AttributeList &attr, QualType &type);
296 static bool handleObjCPointerTypeAttr(TypeProcessingState &state,
297 AttributeList &attr, QualType &type) {
298 if (attr.getKind() == AttributeList::AT_ObjCGC)
299 return handleObjCGCTypeAttr(state, attr, type);
300 assert(attr.getKind() == AttributeList::AT_ObjCOwnership);
301 return handleObjCOwnershipTypeAttr(state, attr, type);
304 /// Given the index of a declarator chunk, check whether that chunk
305 /// directly specifies the return type of a function and, if so, find
306 /// an appropriate place for it.
308 /// \param i - a notional index which the search will start
309 /// immediately inside
310 static DeclaratorChunk *maybeMovePastReturnType(Declarator &declarator,
312 assert(i <= declarator.getNumTypeObjects());
314 DeclaratorChunk *result = nullptr;
316 // First, look inwards past parens for a function declarator.
317 for (; i != 0; --i) {
318 DeclaratorChunk &fnChunk = declarator.getTypeObject(i-1);
319 switch (fnChunk.Kind) {
320 case DeclaratorChunk::Paren:
323 // If we find anything except a function, bail out.
324 case DeclaratorChunk::Pointer:
325 case DeclaratorChunk::BlockPointer:
326 case DeclaratorChunk::Array:
327 case DeclaratorChunk::Reference:
328 case DeclaratorChunk::MemberPointer:
331 // If we do find a function declarator, scan inwards from that,
332 // looking for a block-pointer declarator.
333 case DeclaratorChunk::Function:
334 for (--i; i != 0; --i) {
335 DeclaratorChunk &blockChunk = declarator.getTypeObject(i-1);
336 switch (blockChunk.Kind) {
337 case DeclaratorChunk::Paren:
338 case DeclaratorChunk::Pointer:
339 case DeclaratorChunk::Array:
340 case DeclaratorChunk::Function:
341 case DeclaratorChunk::Reference:
342 case DeclaratorChunk::MemberPointer:
344 case DeclaratorChunk::BlockPointer:
345 result = &blockChunk;
348 llvm_unreachable("bad declarator chunk kind");
351 // If we run out of declarators doing that, we're done.
354 llvm_unreachable("bad declarator chunk kind");
356 // Okay, reconsider from our new point.
360 // Ran out of chunks, bail out.
364 /// Given that an objc_gc attribute was written somewhere on a
365 /// declaration *other* than on the declarator itself (for which, use
366 /// distributeObjCPointerTypeAttrFromDeclarator), and given that it
367 /// didn't apply in whatever position it was written in, try to move
368 /// it to a more appropriate position.
369 static void distributeObjCPointerTypeAttr(TypeProcessingState &state,
372 Declarator &declarator = state.getDeclarator();
374 // Move it to the outermost normal or block pointer declarator.
375 for (unsigned i = state.getCurrentChunkIndex(); i != 0; --i) {
376 DeclaratorChunk &chunk = declarator.getTypeObject(i-1);
377 switch (chunk.Kind) {
378 case DeclaratorChunk::Pointer:
379 case DeclaratorChunk::BlockPointer: {
380 // But don't move an ARC ownership attribute to the return type
382 DeclaratorChunk *destChunk = nullptr;
383 if (state.isProcessingDeclSpec() &&
384 attr.getKind() == AttributeList::AT_ObjCOwnership)
385 destChunk = maybeMovePastReturnType(declarator, i - 1);
386 if (!destChunk) destChunk = &chunk;
388 moveAttrFromListToList(attr, state.getCurrentAttrListRef(),
389 destChunk->getAttrListRef());
393 case DeclaratorChunk::Paren:
394 case DeclaratorChunk::Array:
397 // We may be starting at the return type of a block.
398 case DeclaratorChunk::Function:
399 if (state.isProcessingDeclSpec() &&
400 attr.getKind() == AttributeList::AT_ObjCOwnership) {
401 if (DeclaratorChunk *dest = maybeMovePastReturnType(declarator, i)) {
402 moveAttrFromListToList(attr, state.getCurrentAttrListRef(),
403 dest->getAttrListRef());
409 // Don't walk through these.
410 case DeclaratorChunk::Reference:
411 case DeclaratorChunk::MemberPointer:
417 diagnoseBadTypeAttribute(state.getSema(), attr, type);
420 /// Distribute an objc_gc type attribute that was written on the
423 distributeObjCPointerTypeAttrFromDeclarator(TypeProcessingState &state,
425 QualType &declSpecType) {
426 Declarator &declarator = state.getDeclarator();
428 // objc_gc goes on the innermost pointer to something that's not a
430 unsigned innermost = -1U;
431 bool considerDeclSpec = true;
432 for (unsigned i = 0, e = declarator.getNumTypeObjects(); i != e; ++i) {
433 DeclaratorChunk &chunk = declarator.getTypeObject(i);
434 switch (chunk.Kind) {
435 case DeclaratorChunk::Pointer:
436 case DeclaratorChunk::BlockPointer:
440 case DeclaratorChunk::Reference:
441 case DeclaratorChunk::MemberPointer:
442 case DeclaratorChunk::Paren:
443 case DeclaratorChunk::Array:
446 case DeclaratorChunk::Function:
447 considerDeclSpec = false;
453 // That might actually be the decl spec if we weren't blocked by
454 // anything in the declarator.
455 if (considerDeclSpec) {
456 if (handleObjCPointerTypeAttr(state, attr, declSpecType)) {
457 // Splice the attribute into the decl spec. Prevents the
458 // attribute from being applied multiple times and gives
459 // the source-location-filler something to work with.
460 state.saveDeclSpecAttrs();
461 moveAttrFromListToList(attr, declarator.getAttrListRef(),
462 declarator.getMutableDeclSpec().getAttributes().getListRef());
467 // Otherwise, if we found an appropriate chunk, splice the attribute
469 if (innermost != -1U) {
470 moveAttrFromListToList(attr, declarator.getAttrListRef(),
471 declarator.getTypeObject(innermost).getAttrListRef());
475 // Otherwise, diagnose when we're done building the type.
476 spliceAttrOutOfList(attr, declarator.getAttrListRef());
477 state.addIgnoredTypeAttr(attr);
480 /// A function type attribute was written somewhere in a declaration
481 /// *other* than on the declarator itself or in the decl spec. Given
482 /// that it didn't apply in whatever position it was written in, try
483 /// to move it to a more appropriate position.
484 static void distributeFunctionTypeAttr(TypeProcessingState &state,
487 Declarator &declarator = state.getDeclarator();
489 // Try to push the attribute from the return type of a function to
490 // the function itself.
491 for (unsigned i = state.getCurrentChunkIndex(); i != 0; --i) {
492 DeclaratorChunk &chunk = declarator.getTypeObject(i-1);
493 switch (chunk.Kind) {
494 case DeclaratorChunk::Function:
495 moveAttrFromListToList(attr, state.getCurrentAttrListRef(),
496 chunk.getAttrListRef());
499 case DeclaratorChunk::Paren:
500 case DeclaratorChunk::Pointer:
501 case DeclaratorChunk::BlockPointer:
502 case DeclaratorChunk::Array:
503 case DeclaratorChunk::Reference:
504 case DeclaratorChunk::MemberPointer:
509 diagnoseBadTypeAttribute(state.getSema(), attr, type);
512 /// Try to distribute a function type attribute to the innermost
513 /// function chunk or type. Returns true if the attribute was
514 /// distributed, false if no location was found.
516 distributeFunctionTypeAttrToInnermost(TypeProcessingState &state,
518 AttributeList *&attrList,
519 QualType &declSpecType) {
520 Declarator &declarator = state.getDeclarator();
522 // Put it on the innermost function chunk, if there is one.
523 for (unsigned i = 0, e = declarator.getNumTypeObjects(); i != e; ++i) {
524 DeclaratorChunk &chunk = declarator.getTypeObject(i);
525 if (chunk.Kind != DeclaratorChunk::Function) continue;
527 moveAttrFromListToList(attr, attrList, chunk.getAttrListRef());
531 return handleFunctionTypeAttr(state, attr, declSpecType);
534 /// A function type attribute was written in the decl spec. Try to
535 /// apply it somewhere.
537 distributeFunctionTypeAttrFromDeclSpec(TypeProcessingState &state,
539 QualType &declSpecType) {
540 state.saveDeclSpecAttrs();
542 // C++11 attributes before the decl specifiers actually appertain to
543 // the declarators. Move them straight there. We don't support the
544 // 'put them wherever you like' semantics we allow for GNU attributes.
545 if (attr.isCXX11Attribute()) {
546 moveAttrFromListToList(attr, state.getCurrentAttrListRef(),
547 state.getDeclarator().getAttrListRef());
551 // Try to distribute to the innermost.
552 if (distributeFunctionTypeAttrToInnermost(state, attr,
553 state.getCurrentAttrListRef(),
557 // If that failed, diagnose the bad attribute when the declarator is
559 state.addIgnoredTypeAttr(attr);
562 /// A function type attribute was written on the declarator. Try to
563 /// apply it somewhere.
565 distributeFunctionTypeAttrFromDeclarator(TypeProcessingState &state,
567 QualType &declSpecType) {
568 Declarator &declarator = state.getDeclarator();
570 // Try to distribute to the innermost.
571 if (distributeFunctionTypeAttrToInnermost(state, attr,
572 declarator.getAttrListRef(),
576 // If that failed, diagnose the bad attribute when the declarator is
578 spliceAttrOutOfList(attr, declarator.getAttrListRef());
579 state.addIgnoredTypeAttr(attr);
582 /// \brief Given that there are attributes written on the declarator
583 /// itself, try to distribute any type attributes to the appropriate
584 /// declarator chunk.
586 /// These are attributes like the following:
589 /// but not necessarily this:
591 static void distributeTypeAttrsFromDeclarator(TypeProcessingState &state,
592 QualType &declSpecType) {
593 // Collect all the type attributes from the declarator itself.
594 assert(state.getDeclarator().getAttributes() && "declarator has no attrs!");
595 AttributeList *attr = state.getDeclarator().getAttributes();
598 next = attr->getNext();
600 // Do not distribute C++11 attributes. They have strict rules for what
601 // they appertain to.
602 if (attr->isCXX11Attribute())
605 switch (attr->getKind()) {
606 OBJC_POINTER_TYPE_ATTRS_CASELIST:
607 distributeObjCPointerTypeAttrFromDeclarator(state, *attr, declSpecType);
610 case AttributeList::AT_NSReturnsRetained:
611 if (!state.getSema().getLangOpts().ObjCAutoRefCount)
615 FUNCTION_TYPE_ATTRS_CASELIST:
616 distributeFunctionTypeAttrFromDeclarator(state, *attr, declSpecType);
619 MS_TYPE_ATTRS_CASELIST:
620 // Microsoft type attributes cannot go after the declarator-id.
626 } while ((attr = next));
629 /// Add a synthetic '()' to a block-literal declarator if it is
630 /// required, given the return type.
631 static void maybeSynthesizeBlockSignature(TypeProcessingState &state,
632 QualType declSpecType) {
633 Declarator &declarator = state.getDeclarator();
635 // First, check whether the declarator would produce a function,
636 // i.e. whether the innermost semantic chunk is a function.
637 if (declarator.isFunctionDeclarator()) {
638 // If so, make that declarator a prototyped declarator.
639 declarator.getFunctionTypeInfo().hasPrototype = true;
643 // If there are any type objects, the type as written won't name a
644 // function, regardless of the decl spec type. This is because a
645 // block signature declarator is always an abstract-declarator, and
646 // abstract-declarators can't just be parentheses chunks. Therefore
647 // we need to build a function chunk unless there are no type
648 // objects and the decl spec type is a function.
649 if (!declarator.getNumTypeObjects() && declSpecType->isFunctionType())
652 // Note that there *are* cases with invalid declarators where
653 // declarators consist solely of parentheses. In general, these
654 // occur only in failed efforts to make function declarators, so
655 // faking up the function chunk is still the right thing to do.
657 // Otherwise, we need to fake up a function declarator.
658 SourceLocation loc = declarator.getLocStart();
660 // ...and *prepend* it to the declarator.
661 SourceLocation NoLoc;
662 declarator.AddInnermostTypeInfo(DeclaratorChunk::getFunction(
664 /*IsAmbiguous=*/false,
668 /*EllipsisLoc=*/NoLoc,
671 /*RefQualifierIsLvalueRef=*/true,
672 /*RefQualifierLoc=*/NoLoc,
673 /*ConstQualifierLoc=*/NoLoc,
674 /*VolatileQualifierLoc=*/NoLoc,
675 /*RestrictQualifierLoc=*/NoLoc,
676 /*MutableLoc=*/NoLoc, EST_None,
678 /*Exceptions=*/nullptr,
679 /*ExceptionRanges=*/nullptr,
681 /*NoexceptExpr=*/nullptr,
682 /*ExceptionSpecTokens=*/nullptr,
683 loc, loc, declarator));
685 // For consistency, make sure the state still has us as processing
687 assert(state.getCurrentChunkIndex() == declarator.getNumTypeObjects() - 1);
688 state.setCurrentChunkIndex(declarator.getNumTypeObjects());
691 static void diagnoseAndRemoveTypeQualifiers(Sema &S, const DeclSpec &DS,
696 // If this occurs outside a template instantiation, warn the user about
697 // it; they probably didn't mean to specify a redundant qualifier.
698 typedef std::pair<DeclSpec::TQ, SourceLocation> QualLoc;
699 for (QualLoc Qual : {QualLoc(DeclSpec::TQ_const, DS.getConstSpecLoc()),
700 QualLoc(DeclSpec::TQ_volatile, DS.getVolatileSpecLoc()),
701 QualLoc(DeclSpec::TQ_atomic, DS.getAtomicSpecLoc())}) {
702 if (!(RemoveTQs & Qual.first))
705 if (S.ActiveTemplateInstantiations.empty()) {
706 if (TypeQuals & Qual.first)
707 S.Diag(Qual.second, DiagID)
708 << DeclSpec::getSpecifierName(Qual.first) << TypeSoFar
709 << FixItHint::CreateRemoval(Qual.second);
712 TypeQuals &= ~Qual.first;
716 /// \brief Convert the specified declspec to the appropriate type
718 /// \param state Specifies the declarator containing the declaration specifier
719 /// to be converted, along with other associated processing state.
720 /// \returns The type described by the declaration specifiers. This function
721 /// never returns null.
722 static QualType ConvertDeclSpecToType(TypeProcessingState &state) {
723 // FIXME: Should move the logic from DeclSpec::Finish to here for validity
726 Sema &S = state.getSema();
727 Declarator &declarator = state.getDeclarator();
728 const DeclSpec &DS = declarator.getDeclSpec();
729 SourceLocation DeclLoc = declarator.getIdentifierLoc();
730 if (DeclLoc.isInvalid())
731 DeclLoc = DS.getLocStart();
733 ASTContext &Context = S.Context;
736 switch (DS.getTypeSpecType()) {
737 case DeclSpec::TST_void:
738 Result = Context.VoidTy;
740 case DeclSpec::TST_char:
741 if (DS.getTypeSpecSign() == DeclSpec::TSS_unspecified)
742 Result = Context.CharTy;
743 else if (DS.getTypeSpecSign() == DeclSpec::TSS_signed)
744 Result = Context.SignedCharTy;
746 assert(DS.getTypeSpecSign() == DeclSpec::TSS_unsigned &&
747 "Unknown TSS value");
748 Result = Context.UnsignedCharTy;
751 case DeclSpec::TST_wchar:
752 if (DS.getTypeSpecSign() == DeclSpec::TSS_unspecified)
753 Result = Context.WCharTy;
754 else if (DS.getTypeSpecSign() == DeclSpec::TSS_signed) {
755 S.Diag(DS.getTypeSpecSignLoc(), diag::ext_invalid_sign_spec)
756 << DS.getSpecifierName(DS.getTypeSpecType(),
757 Context.getPrintingPolicy());
758 Result = Context.getSignedWCharType();
760 assert(DS.getTypeSpecSign() == DeclSpec::TSS_unsigned &&
761 "Unknown TSS value");
762 S.Diag(DS.getTypeSpecSignLoc(), diag::ext_invalid_sign_spec)
763 << DS.getSpecifierName(DS.getTypeSpecType(),
764 Context.getPrintingPolicy());
765 Result = Context.getUnsignedWCharType();
768 case DeclSpec::TST_char16:
769 assert(DS.getTypeSpecSign() == DeclSpec::TSS_unspecified &&
770 "Unknown TSS value");
771 Result = Context.Char16Ty;
773 case DeclSpec::TST_char32:
774 assert(DS.getTypeSpecSign() == DeclSpec::TSS_unspecified &&
775 "Unknown TSS value");
776 Result = Context.Char32Ty;
778 case DeclSpec::TST_unspecified:
779 // "<proto1,proto2>" is an objc qualified ID with a missing id.
780 if (DeclSpec::ProtocolQualifierListTy PQ = DS.getProtocolQualifiers()) {
781 Result = Context.getObjCObjectType(Context.ObjCBuiltinIdTy,
782 (ObjCProtocolDecl*const*)PQ,
783 DS.getNumProtocolQualifiers());
784 Result = Context.getObjCObjectPointerType(Result);
788 // If this is a missing declspec in a block literal return context, then it
789 // is inferred from the return statements inside the block.
790 // The declspec is always missing in a lambda expr context; it is either
791 // specified with a trailing return type or inferred.
792 if (S.getLangOpts().CPlusPlus14 &&
793 declarator.getContext() == Declarator::LambdaExprContext) {
794 // In C++1y, a lambda's implicit return type is 'auto'.
795 Result = Context.getAutoDeductType();
797 } else if (declarator.getContext() == Declarator::LambdaExprContext ||
798 isOmittedBlockReturnType(declarator)) {
799 Result = Context.DependentTy;
803 // Unspecified typespec defaults to int in C90. However, the C90 grammar
804 // [C90 6.5] only allows a decl-spec if there was *some* type-specifier,
805 // type-qualifier, or storage-class-specifier. If not, emit an extwarn.
806 // Note that the one exception to this is function definitions, which are
807 // allowed to be completely missing a declspec. This is handled in the
808 // parser already though by it pretending to have seen an 'int' in this
810 if (S.getLangOpts().ImplicitInt) {
811 // In C89 mode, we only warn if there is a completely missing declspec
812 // when one is not allowed.
814 S.Diag(DeclLoc, diag::ext_missing_declspec)
815 << DS.getSourceRange()
816 << FixItHint::CreateInsertion(DS.getLocStart(), "int");
818 } else if (!DS.hasTypeSpecifier()) {
819 // C99 and C++ require a type specifier. For example, C99 6.7.2p2 says:
820 // "At least one type specifier shall be given in the declaration
821 // specifiers in each declaration, and in the specifier-qualifier list in
822 // each struct declaration and type name."
823 if (S.getLangOpts().CPlusPlus) {
824 S.Diag(DeclLoc, diag::err_missing_type_specifier)
825 << DS.getSourceRange();
827 // When this occurs in C++ code, often something is very broken with the
828 // value being declared, poison it as invalid so we don't get chains of
830 declarator.setInvalidType(true);
832 S.Diag(DeclLoc, diag::ext_missing_type_specifier)
833 << DS.getSourceRange();
838 case DeclSpec::TST_int: {
839 if (DS.getTypeSpecSign() != DeclSpec::TSS_unsigned) {
840 switch (DS.getTypeSpecWidth()) {
841 case DeclSpec::TSW_unspecified: Result = Context.IntTy; break;
842 case DeclSpec::TSW_short: Result = Context.ShortTy; break;
843 case DeclSpec::TSW_long: Result = Context.LongTy; break;
844 case DeclSpec::TSW_longlong:
845 Result = Context.LongLongTy;
847 // 'long long' is a C99 or C++11 feature.
848 if (!S.getLangOpts().C99) {
849 if (S.getLangOpts().CPlusPlus)
850 S.Diag(DS.getTypeSpecWidthLoc(),
851 S.getLangOpts().CPlusPlus11 ?
852 diag::warn_cxx98_compat_longlong : diag::ext_cxx11_longlong);
854 S.Diag(DS.getTypeSpecWidthLoc(), diag::ext_c99_longlong);
859 switch (DS.getTypeSpecWidth()) {
860 case DeclSpec::TSW_unspecified: Result = Context.UnsignedIntTy; break;
861 case DeclSpec::TSW_short: Result = Context.UnsignedShortTy; break;
862 case DeclSpec::TSW_long: Result = Context.UnsignedLongTy; break;
863 case DeclSpec::TSW_longlong:
864 Result = Context.UnsignedLongLongTy;
866 // 'long long' is a C99 or C++11 feature.
867 if (!S.getLangOpts().C99) {
868 if (S.getLangOpts().CPlusPlus)
869 S.Diag(DS.getTypeSpecWidthLoc(),
870 S.getLangOpts().CPlusPlus11 ?
871 diag::warn_cxx98_compat_longlong : diag::ext_cxx11_longlong);
873 S.Diag(DS.getTypeSpecWidthLoc(), diag::ext_c99_longlong);
880 case DeclSpec::TST_int128:
881 if (!S.Context.getTargetInfo().hasInt128Type())
882 S.Diag(DS.getTypeSpecTypeLoc(), diag::err_int128_unsupported);
883 if (DS.getTypeSpecSign() == DeclSpec::TSS_unsigned)
884 Result = Context.UnsignedInt128Ty;
886 Result = Context.Int128Ty;
888 case DeclSpec::TST_half: Result = Context.HalfTy; break;
889 case DeclSpec::TST_float: Result = Context.FloatTy; break;
890 case DeclSpec::TST_double:
891 if (DS.getTypeSpecWidth() == DeclSpec::TSW_long)
892 Result = Context.LongDoubleTy;
894 Result = Context.DoubleTy;
896 if (S.getLangOpts().OpenCL &&
897 !((S.getLangOpts().OpenCLVersion >= 120) ||
898 S.getOpenCLOptions().cl_khr_fp64)) {
899 S.Diag(DS.getTypeSpecTypeLoc(), diag::err_type_requires_extension)
900 << Result << "cl_khr_fp64";
901 declarator.setInvalidType(true);
904 case DeclSpec::TST_bool: Result = Context.BoolTy; break; // _Bool or bool
905 case DeclSpec::TST_decimal32: // _Decimal32
906 case DeclSpec::TST_decimal64: // _Decimal64
907 case DeclSpec::TST_decimal128: // _Decimal128
908 S.Diag(DS.getTypeSpecTypeLoc(), diag::err_decimal_unsupported);
909 Result = Context.IntTy;
910 declarator.setInvalidType(true);
912 case DeclSpec::TST_class:
913 case DeclSpec::TST_enum:
914 case DeclSpec::TST_union:
915 case DeclSpec::TST_struct:
916 case DeclSpec::TST_interface: {
917 TypeDecl *D = dyn_cast_or_null<TypeDecl>(DS.getRepAsDecl());
919 // This can happen in C++ with ambiguous lookups.
920 Result = Context.IntTy;
921 declarator.setInvalidType(true);
925 // If the type is deprecated or unavailable, diagnose it.
926 S.DiagnoseUseOfDecl(D, DS.getTypeSpecTypeNameLoc());
928 assert(DS.getTypeSpecWidth() == 0 && DS.getTypeSpecComplex() == 0 &&
929 DS.getTypeSpecSign() == 0 && "No qualifiers on tag names!");
931 // TypeQuals handled by caller.
932 Result = Context.getTypeDeclType(D);
934 // In both C and C++, make an ElaboratedType.
935 ElaboratedTypeKeyword Keyword
936 = ElaboratedType::getKeywordForTypeSpec(DS.getTypeSpecType());
937 Result = S.getElaboratedType(Keyword, DS.getTypeSpecScope(), Result);
940 case DeclSpec::TST_typename: {
941 assert(DS.getTypeSpecWidth() == 0 && DS.getTypeSpecComplex() == 0 &&
942 DS.getTypeSpecSign() == 0 &&
943 "Can't handle qualifiers on typedef names yet!");
944 Result = S.GetTypeFromParser(DS.getRepAsType());
946 declarator.setInvalidType(true);
947 else if (DeclSpec::ProtocolQualifierListTy PQ
948 = DS.getProtocolQualifiers()) {
949 if (const ObjCObjectType *ObjT = Result->getAs<ObjCObjectType>()) {
950 // Silently drop any existing protocol qualifiers.
951 // TODO: determine whether that's the right thing to do.
952 if (ObjT->getNumProtocols())
953 Result = ObjT->getBaseType();
955 if (DS.getNumProtocolQualifiers())
956 Result = Context.getObjCObjectType(Result,
957 (ObjCProtocolDecl*const*) PQ,
958 DS.getNumProtocolQualifiers());
959 } else if (Result->isObjCIdType()) {
961 Result = Context.getObjCObjectType(Context.ObjCBuiltinIdTy,
962 (ObjCProtocolDecl*const*) PQ,
963 DS.getNumProtocolQualifiers());
964 Result = Context.getObjCObjectPointerType(Result);
965 } else if (Result->isObjCClassType()) {
966 // Class<protocol-list>
967 Result = Context.getObjCObjectType(Context.ObjCBuiltinClassTy,
968 (ObjCProtocolDecl*const*) PQ,
969 DS.getNumProtocolQualifiers());
970 Result = Context.getObjCObjectPointerType(Result);
972 S.Diag(DeclLoc, diag::err_invalid_protocol_qualifiers)
973 << DS.getSourceRange();
974 declarator.setInvalidType(true);
976 } else if (S.getLangOpts().OpenCL) {
977 if (const AtomicType *AT = Result->getAs<AtomicType>()) {
978 const BuiltinType *BT = AT->getValueType()->getAs<BuiltinType>();
979 bool NoExtTypes = BT && (BT->getKind() == BuiltinType::Int ||
980 BT->getKind() == BuiltinType::UInt ||
981 BT->getKind() == BuiltinType::Float);
982 if (!S.getOpenCLOptions().cl_khr_int64_base_atomics && !NoExtTypes) {
983 S.Diag(DS.getTypeSpecTypeLoc(), diag::err_type_requires_extension)
984 << Result << "cl_khr_int64_base_atomics";
985 declarator.setInvalidType(true);
987 if (!S.getOpenCLOptions().cl_khr_int64_extended_atomics &&
989 S.Diag(DS.getTypeSpecTypeLoc(), diag::err_type_requires_extension)
990 << Result << "cl_khr_int64_extended_atomics";
991 declarator.setInvalidType(true);
993 if (!S.getOpenCLOptions().cl_khr_fp64 && BT &&
994 BT->getKind() == BuiltinType::Double) {
995 S.Diag(DS.getTypeSpecTypeLoc(), diag::err_type_requires_extension)
996 << Result << "cl_khr_fp64";
997 declarator.setInvalidType(true);
1002 // TypeQuals handled by caller.
1005 case DeclSpec::TST_typeofType:
1006 // FIXME: Preserve type source info.
1007 Result = S.GetTypeFromParser(DS.getRepAsType());
1008 assert(!Result.isNull() && "Didn't get a type for typeof?");
1009 if (!Result->isDependentType())
1010 if (const TagType *TT = Result->getAs<TagType>())
1011 S.DiagnoseUseOfDecl(TT->getDecl(), DS.getTypeSpecTypeLoc());
1012 // TypeQuals handled by caller.
1013 Result = Context.getTypeOfType(Result);
1015 case DeclSpec::TST_typeofExpr: {
1016 Expr *E = DS.getRepAsExpr();
1017 assert(E && "Didn't get an expression for typeof?");
1018 // TypeQuals handled by caller.
1019 Result = S.BuildTypeofExprType(E, DS.getTypeSpecTypeLoc());
1020 if (Result.isNull()) {
1021 Result = Context.IntTy;
1022 declarator.setInvalidType(true);
1026 case DeclSpec::TST_decltype: {
1027 Expr *E = DS.getRepAsExpr();
1028 assert(E && "Didn't get an expression for decltype?");
1029 // TypeQuals handled by caller.
1030 Result = S.BuildDecltypeType(E, DS.getTypeSpecTypeLoc());
1031 if (Result.isNull()) {
1032 Result = Context.IntTy;
1033 declarator.setInvalidType(true);
1037 case DeclSpec::TST_underlyingType:
1038 Result = S.GetTypeFromParser(DS.getRepAsType());
1039 assert(!Result.isNull() && "Didn't get a type for __underlying_type?");
1040 Result = S.BuildUnaryTransformType(Result,
1041 UnaryTransformType::EnumUnderlyingType,
1042 DS.getTypeSpecTypeLoc());
1043 if (Result.isNull()) {
1044 Result = Context.IntTy;
1045 declarator.setInvalidType(true);
1049 case DeclSpec::TST_auto:
1050 // TypeQuals handled by caller.
1051 // If auto is mentioned in a lambda parameter context, convert it to a
1052 // template parameter type immediately, with the appropriate depth and
1053 // index, and update sema's state (LambdaScopeInfo) for the current lambda
1054 // being analyzed (which tracks the invented type template parameter).
1055 if (declarator.getContext() == Declarator::LambdaExprParameterContext) {
1056 sema::LambdaScopeInfo *LSI = S.getCurLambda();
1057 assert(LSI && "No LambdaScopeInfo on the stack!");
1058 const unsigned TemplateParameterDepth = LSI->AutoTemplateParameterDepth;
1059 const unsigned AutoParameterPosition = LSI->AutoTemplateParams.size();
1060 const bool IsParameterPack = declarator.hasEllipsis();
1062 // Turns out we must create the TemplateTypeParmDecl here to
1063 // retrieve the corresponding template parameter type.
1064 TemplateTypeParmDecl *CorrespondingTemplateParam =
1065 TemplateTypeParmDecl::Create(Context,
1066 // Temporarily add to the TranslationUnit DeclContext. When the
1067 // associated TemplateParameterList is attached to a template
1068 // declaration (such as FunctionTemplateDecl), the DeclContext
1069 // for each template parameter gets updated appropriately via
1070 // a call to AdoptTemplateParameterList.
1071 Context.getTranslationUnitDecl(),
1072 /*KeyLoc*/ SourceLocation(),
1073 /*NameLoc*/ declarator.getLocStart(),
1074 TemplateParameterDepth,
1075 AutoParameterPosition, // our template param index
1076 /* Identifier*/ nullptr, false, IsParameterPack);
1077 LSI->AutoTemplateParams.push_back(CorrespondingTemplateParam);
1078 // Replace the 'auto' in the function parameter with this invented
1079 // template type parameter.
1080 Result = QualType(CorrespondingTemplateParam->getTypeForDecl(), 0);
1082 Result = Context.getAutoType(QualType(), /*decltype(auto)*/false, false);
1086 case DeclSpec::TST_decltype_auto:
1087 Result = Context.getAutoType(QualType(),
1088 /*decltype(auto)*/true,
1089 /*IsDependent*/ false);
1092 case DeclSpec::TST_unknown_anytype:
1093 Result = Context.UnknownAnyTy;
1096 case DeclSpec::TST_atomic:
1097 Result = S.GetTypeFromParser(DS.getRepAsType());
1098 assert(!Result.isNull() && "Didn't get a type for _Atomic?");
1099 Result = S.BuildAtomicType(Result, DS.getTypeSpecTypeLoc());
1100 if (Result.isNull()) {
1101 Result = Context.IntTy;
1102 declarator.setInvalidType(true);
1106 case DeclSpec::TST_error:
1107 Result = Context.IntTy;
1108 declarator.setInvalidType(true);
1112 // Handle complex types.
1113 if (DS.getTypeSpecComplex() == DeclSpec::TSC_complex) {
1114 if (S.getLangOpts().Freestanding)
1115 S.Diag(DS.getTypeSpecComplexLoc(), diag::ext_freestanding_complex);
1116 Result = Context.getComplexType(Result);
1117 } else if (DS.isTypeAltiVecVector()) {
1118 unsigned typeSize = static_cast<unsigned>(Context.getTypeSize(Result));
1119 assert(typeSize > 0 && "type size for vector must be greater than 0 bits");
1120 VectorType::VectorKind VecKind = VectorType::AltiVecVector;
1121 if (DS.isTypeAltiVecPixel())
1122 VecKind = VectorType::AltiVecPixel;
1123 else if (DS.isTypeAltiVecBool())
1124 VecKind = VectorType::AltiVecBool;
1125 Result = Context.getVectorType(Result, 128/typeSize, VecKind);
1128 // FIXME: Imaginary.
1129 if (DS.getTypeSpecComplex() == DeclSpec::TSC_imaginary)
1130 S.Diag(DS.getTypeSpecComplexLoc(), diag::err_imaginary_not_supported);
1132 // Before we process any type attributes, synthesize a block literal
1133 // function declarator if necessary.
1134 if (declarator.getContext() == Declarator::BlockLiteralContext)
1135 maybeSynthesizeBlockSignature(state, Result);
1137 // Apply any type attributes from the decl spec. This may cause the
1138 // list of type attributes to be temporarily saved while the type
1139 // attributes are pushed around.
1140 if (AttributeList *attrs = DS.getAttributes().getList())
1141 processTypeAttrs(state, Result, TAL_DeclSpec, attrs);
1143 // Apply const/volatile/restrict qualifiers to T.
1144 if (unsigned TypeQuals = DS.getTypeQualifiers()) {
1145 // Warn about CV qualifiers on function types.
1147 // If the specification of a function type includes any type qualifiers,
1148 // the behavior is undefined.
1149 // C++11 [dcl.fct]p7:
1150 // The effect of a cv-qualifier-seq in a function declarator is not the
1151 // same as adding cv-qualification on top of the function type. In the
1152 // latter case, the cv-qualifiers are ignored.
1153 if (TypeQuals && Result->isFunctionType()) {
1154 diagnoseAndRemoveTypeQualifiers(
1155 S, DS, TypeQuals, Result, DeclSpec::TQ_const | DeclSpec::TQ_volatile,
1156 S.getLangOpts().CPlusPlus
1157 ? diag::warn_typecheck_function_qualifiers_ignored
1158 : diag::warn_typecheck_function_qualifiers_unspecified);
1159 // No diagnostic for 'restrict' or '_Atomic' applied to a
1160 // function type; we'll diagnose those later, in BuildQualifiedType.
1163 // C++11 [dcl.ref]p1:
1164 // Cv-qualified references are ill-formed except when the
1165 // cv-qualifiers are introduced through the use of a typedef-name
1166 // or decltype-specifier, in which case the cv-qualifiers are ignored.
1168 // There don't appear to be any other contexts in which a cv-qualified
1169 // reference type could be formed, so the 'ill-formed' clause here appears
1171 if (TypeQuals && Result->isReferenceType()) {
1172 diagnoseAndRemoveTypeQualifiers(
1173 S, DS, TypeQuals, Result,
1174 DeclSpec::TQ_const | DeclSpec::TQ_volatile | DeclSpec::TQ_atomic,
1175 diag::warn_typecheck_reference_qualifiers);
1178 // C90 6.5.3 constraints: "The same type qualifier shall not appear more
1179 // than once in the same specifier-list or qualifier-list, either directly
1180 // or via one or more typedefs."
1181 if (!S.getLangOpts().C99 && !S.getLangOpts().CPlusPlus
1182 && TypeQuals & Result.getCVRQualifiers()) {
1183 if (TypeQuals & DeclSpec::TQ_const && Result.isConstQualified()) {
1184 S.Diag(DS.getConstSpecLoc(), diag::ext_duplicate_declspec)
1188 if (TypeQuals & DeclSpec::TQ_volatile && Result.isVolatileQualified()) {
1189 S.Diag(DS.getVolatileSpecLoc(), diag::ext_duplicate_declspec)
1193 // C90 doesn't have restrict nor _Atomic, so it doesn't force us to
1194 // produce a warning in this case.
1197 QualType Qualified = S.BuildQualifiedType(Result, DeclLoc, TypeQuals, &DS);
1199 // If adding qualifiers fails, just use the unqualified type.
1200 if (Qualified.isNull())
1201 declarator.setInvalidType(true);
1206 assert(!Result.isNull() && "This function should not return a null type");
1210 static std::string getPrintableNameForEntity(DeclarationName Entity) {
1212 return Entity.getAsString();
1217 QualType Sema::BuildQualifiedType(QualType T, SourceLocation Loc,
1218 Qualifiers Qs, const DeclSpec *DS) {
1222 // Enforce C99 6.7.3p2: "Types other than pointer types derived from
1223 // object or incomplete types shall not be restrict-qualified."
1224 if (Qs.hasRestrict()) {
1225 unsigned DiagID = 0;
1228 if (T->isAnyPointerType() || T->isReferenceType() ||
1229 T->isMemberPointerType()) {
1231 if (T->isObjCObjectPointerType())
1233 else if (const MemberPointerType *PTy = T->getAs<MemberPointerType>())
1234 EltTy = PTy->getPointeeType();
1236 EltTy = T->getPointeeType();
1238 // If we have a pointer or reference, the pointee must have an object
1240 if (!EltTy->isIncompleteOrObjectType()) {
1241 DiagID = diag::err_typecheck_invalid_restrict_invalid_pointee;
1244 } else if (!T->isDependentType()) {
1245 DiagID = diag::err_typecheck_invalid_restrict_not_pointer;
1250 Diag(DS ? DS->getRestrictSpecLoc() : Loc, DiagID) << ProblemTy;
1251 Qs.removeRestrict();
1255 return Context.getQualifiedType(T, Qs);
1258 QualType Sema::BuildQualifiedType(QualType T, SourceLocation Loc,
1259 unsigned CVRA, const DeclSpec *DS) {
1263 // Convert from DeclSpec::TQ to Qualifiers::TQ by just dropping TQ_atomic.
1264 unsigned CVR = CVRA & ~DeclSpec::TQ_atomic;
1267 // If the same qualifier appears more than once in the same
1268 // specifier-qualifier-list, either directly or via one or more typedefs,
1269 // the behavior is the same as if it appeared only once.
1271 // It's not specified what happens when the _Atomic qualifier is applied to
1272 // a type specified with the _Atomic specifier, but we assume that this
1273 // should be treated as if the _Atomic qualifier appeared multiple times.
1274 if (CVRA & DeclSpec::TQ_atomic && !T->isAtomicType()) {
1276 // If other qualifiers appear along with the _Atomic qualifier in a
1277 // specifier-qualifier-list, the resulting type is the so-qualified
1280 // Don't need to worry about array types here, since _Atomic can't be
1281 // applied to such types.
1282 SplitQualType Split = T.getSplitUnqualifiedType();
1283 T = BuildAtomicType(QualType(Split.Ty, 0),
1284 DS ? DS->getAtomicSpecLoc() : Loc);
1287 Split.Quals.addCVRQualifiers(CVR);
1288 return BuildQualifiedType(T, Loc, Split.Quals);
1291 return BuildQualifiedType(T, Loc, Qualifiers::fromCVRMask(CVR), DS);
1294 /// \brief Build a paren type including \p T.
1295 QualType Sema::BuildParenType(QualType T) {
1296 return Context.getParenType(T);
1299 /// Given that we're building a pointer or reference to the given
1300 static QualType inferARCLifetimeForPointee(Sema &S, QualType type,
1303 // Bail out if retention is unrequired or already specified.
1304 if (!type->isObjCLifetimeType() ||
1305 type.getObjCLifetime() != Qualifiers::OCL_None)
1308 Qualifiers::ObjCLifetime implicitLifetime = Qualifiers::OCL_None;
1310 // If the object type is const-qualified, we can safely use
1311 // __unsafe_unretained. This is safe (because there are no read
1312 // barriers), and it'll be safe to coerce anything but __weak* to
1313 // the resulting type.
1314 if (type.isConstQualified()) {
1315 implicitLifetime = Qualifiers::OCL_ExplicitNone;
1317 // Otherwise, check whether the static type does not require
1318 // retaining. This currently only triggers for Class (possibly
1319 // protocol-qualifed, and arrays thereof).
1320 } else if (type->isObjCARCImplicitlyUnretainedType()) {
1321 implicitLifetime = Qualifiers::OCL_ExplicitNone;
1323 // If we are in an unevaluated context, like sizeof, skip adding a
1325 } else if (S.isUnevaluatedContext()) {
1328 // If that failed, give an error and recover using __strong. __strong
1329 // is the option most likely to prevent spurious second-order diagnostics,
1330 // like when binding a reference to a field.
1332 // These types can show up in private ivars in system headers, so
1333 // we need this to not be an error in those cases. Instead we
1335 if (S.DelayedDiagnostics.shouldDelayDiagnostics()) {
1336 S.DelayedDiagnostics.add(
1337 sema::DelayedDiagnostic::makeForbiddenType(loc,
1338 diag::err_arc_indirect_no_ownership, type, isReference));
1340 S.Diag(loc, diag::err_arc_indirect_no_ownership) << type << isReference;
1342 implicitLifetime = Qualifiers::OCL_Strong;
1344 assert(implicitLifetime && "didn't infer any lifetime!");
1347 qs.addObjCLifetime(implicitLifetime);
1348 return S.Context.getQualifiedType(type, qs);
1351 static std::string getFunctionQualifiersAsString(const FunctionProtoType *FnTy){
1353 Qualifiers::fromCVRMask(FnTy->getTypeQuals()).getAsString();
1355 switch (FnTy->getRefQualifier()) {
1376 /// Kinds of declarator that cannot contain a qualified function type.
1378 /// C++98 [dcl.fct]p4 / C++11 [dcl.fct]p6:
1379 /// a function type with a cv-qualifier or a ref-qualifier can only appear
1380 /// at the topmost level of a type.
1382 /// Parens and member pointers are permitted. We don't diagnose array and
1383 /// function declarators, because they don't allow function types at all.
1385 /// The values of this enum are used in diagnostics.
1386 enum QualifiedFunctionKind { QFK_BlockPointer, QFK_Pointer, QFK_Reference };
1389 /// Check whether the type T is a qualified function type, and if it is,
1390 /// diagnose that it cannot be contained within the given kind of declarator.
1391 static bool checkQualifiedFunction(Sema &S, QualType T, SourceLocation Loc,
1392 QualifiedFunctionKind QFK) {
1393 // Does T refer to a function type with a cv-qualifier or a ref-qualifier?
1394 const FunctionProtoType *FPT = T->getAs<FunctionProtoType>();
1395 if (!FPT || (FPT->getTypeQuals() == 0 && FPT->getRefQualifier() == RQ_None))
1398 S.Diag(Loc, diag::err_compound_qualified_function_type)
1399 << QFK << isa<FunctionType>(T.IgnoreParens()) << T
1400 << getFunctionQualifiersAsString(FPT);
1404 /// \brief Build a pointer type.
1406 /// \param T The type to which we'll be building a pointer.
1408 /// \param Loc The location of the entity whose type involves this
1409 /// pointer type or, if there is no such entity, the location of the
1410 /// type that will have pointer type.
1412 /// \param Entity The name of the entity that involves the pointer
1415 /// \returns A suitable pointer type, if there are no
1416 /// errors. Otherwise, returns a NULL type.
1417 QualType Sema::BuildPointerType(QualType T,
1418 SourceLocation Loc, DeclarationName Entity) {
1419 if (T->isReferenceType()) {
1420 // C++ 8.3.2p4: There shall be no ... pointers to references ...
1421 Diag(Loc, diag::err_illegal_decl_pointer_to_reference)
1422 << getPrintableNameForEntity(Entity) << T;
1426 if (checkQualifiedFunction(*this, T, Loc, QFK_Pointer))
1429 assert(!T->isObjCObjectType() && "Should build ObjCObjectPointerType");
1431 // In ARC, it is forbidden to build pointers to unqualified pointers.
1432 if (getLangOpts().ObjCAutoRefCount)
1433 T = inferARCLifetimeForPointee(*this, T, Loc, /*reference*/ false);
1435 // Build the pointer type.
1436 return Context.getPointerType(T);
1439 /// \brief Build a reference type.
1441 /// \param T The type to which we'll be building a reference.
1443 /// \param Loc The location of the entity whose type involves this
1444 /// reference type or, if there is no such entity, the location of the
1445 /// type that will have reference type.
1447 /// \param Entity The name of the entity that involves the reference
1450 /// \returns A suitable reference type, if there are no
1451 /// errors. Otherwise, returns a NULL type.
1452 QualType Sema::BuildReferenceType(QualType T, bool SpelledAsLValue,
1454 DeclarationName Entity) {
1455 assert(Context.getCanonicalType(T) != Context.OverloadTy &&
1456 "Unresolved overloaded function type");
1458 // C++0x [dcl.ref]p6:
1459 // If a typedef (7.1.3), a type template-parameter (14.3.1), or a
1460 // decltype-specifier (7.1.6.2) denotes a type TR that is a reference to a
1461 // type T, an attempt to create the type "lvalue reference to cv TR" creates
1462 // the type "lvalue reference to T", while an attempt to create the type
1463 // "rvalue reference to cv TR" creates the type TR.
1464 bool LValueRef = SpelledAsLValue || T->getAs<LValueReferenceType>();
1466 // C++ [dcl.ref]p4: There shall be no references to references.
1468 // According to C++ DR 106, references to references are only
1469 // diagnosed when they are written directly (e.g., "int & &"),
1470 // but not when they happen via a typedef:
1472 // typedef int& intref;
1473 // typedef intref& intref2;
1475 // Parser::ParseDeclaratorInternal diagnoses the case where
1476 // references are written directly; here, we handle the
1477 // collapsing of references-to-references as described in C++0x.
1478 // DR 106 and 540 introduce reference-collapsing into C++98/03.
1481 // A declarator that specifies the type "reference to cv void"
1483 if (T->isVoidType()) {
1484 Diag(Loc, diag::err_reference_to_void);
1488 if (checkQualifiedFunction(*this, T, Loc, QFK_Reference))
1491 // In ARC, it is forbidden to build references to unqualified pointers.
1492 if (getLangOpts().ObjCAutoRefCount)
1493 T = inferARCLifetimeForPointee(*this, T, Loc, /*reference*/ true);
1495 // Handle restrict on references.
1497 return Context.getLValueReferenceType(T, SpelledAsLValue);
1498 return Context.getRValueReferenceType(T);
1501 /// Check whether the specified array size makes the array type a VLA. If so,
1502 /// return true, if not, return the size of the array in SizeVal.
1503 static bool isArraySizeVLA(Sema &S, Expr *ArraySize, llvm::APSInt &SizeVal) {
1504 // If the size is an ICE, it certainly isn't a VLA. If we're in a GNU mode
1505 // (like gnu99, but not c99) accept any evaluatable value as an extension.
1506 class VLADiagnoser : public Sema::VerifyICEDiagnoser {
1508 VLADiagnoser() : Sema::VerifyICEDiagnoser(true) {}
1510 void diagnoseNotICE(Sema &S, SourceLocation Loc, SourceRange SR) override {
1513 void diagnoseFold(Sema &S, SourceLocation Loc, SourceRange SR) override {
1514 S.Diag(Loc, diag::ext_vla_folded_to_constant) << SR;
1518 return S.VerifyIntegerConstantExpression(ArraySize, &SizeVal, Diagnoser,
1519 S.LangOpts.GNUMode).isInvalid();
1523 /// \brief Build an array type.
1525 /// \param T The type of each element in the array.
1527 /// \param ASM C99 array size modifier (e.g., '*', 'static').
1529 /// \param ArraySize Expression describing the size of the array.
1531 /// \param Brackets The range from the opening '[' to the closing ']'.
1533 /// \param Entity The name of the entity that involves the array
1536 /// \returns A suitable array type, if there are no errors. Otherwise,
1537 /// returns a NULL type.
1538 QualType Sema::BuildArrayType(QualType T, ArrayType::ArraySizeModifier ASM,
1539 Expr *ArraySize, unsigned Quals,
1540 SourceRange Brackets, DeclarationName Entity) {
1542 SourceLocation Loc = Brackets.getBegin();
1543 if (getLangOpts().CPlusPlus) {
1544 // C++ [dcl.array]p1:
1545 // T is called the array element type; this type shall not be a reference
1546 // type, the (possibly cv-qualified) type void, a function type or an
1547 // abstract class type.
1549 // C++ [dcl.array]p3:
1550 // When several "array of" specifications are adjacent, [...] only the
1551 // first of the constant expressions that specify the bounds of the arrays
1554 // Note: function types are handled in the common path with C.
1555 if (T->isReferenceType()) {
1556 Diag(Loc, diag::err_illegal_decl_array_of_references)
1557 << getPrintableNameForEntity(Entity) << T;
1561 if (T->isVoidType() || T->isIncompleteArrayType()) {
1562 Diag(Loc, diag::err_illegal_decl_array_incomplete_type) << T;
1566 if (RequireNonAbstractType(Brackets.getBegin(), T,
1567 diag::err_array_of_abstract_type))
1570 // Mentioning a member pointer type for an array type causes us to lock in
1571 // an inheritance model, even if it's inside an unused typedef.
1572 if (Context.getTargetInfo().getCXXABI().isMicrosoft())
1573 if (const MemberPointerType *MPTy = T->getAs<MemberPointerType>())
1574 if (!MPTy->getClass()->isDependentType())
1575 RequireCompleteType(Loc, T, 0);
1578 // C99 6.7.5.2p1: If the element type is an incomplete or function type,
1579 // reject it (e.g. void ary[7], struct foo ary[7], void ary[7]())
1580 if (RequireCompleteType(Loc, T,
1581 diag::err_illegal_decl_array_incomplete_type))
1585 if (T->isFunctionType()) {
1586 Diag(Loc, diag::err_illegal_decl_array_of_functions)
1587 << getPrintableNameForEntity(Entity) << T;
1591 if (const RecordType *EltTy = T->getAs<RecordType>()) {
1592 // If the element type is a struct or union that contains a variadic
1593 // array, accept it as a GNU extension: C99 6.7.2.1p2.
1594 if (EltTy->getDecl()->hasFlexibleArrayMember())
1595 Diag(Loc, diag::ext_flexible_array_in_array) << T;
1596 } else if (T->isObjCObjectType()) {
1597 Diag(Loc, diag::err_objc_array_of_interfaces) << T;
1601 // Do placeholder conversions on the array size expression.
1602 if (ArraySize && ArraySize->hasPlaceholderType()) {
1603 ExprResult Result = CheckPlaceholderExpr(ArraySize);
1604 if (Result.isInvalid()) return QualType();
1605 ArraySize = Result.get();
1608 // Do lvalue-to-rvalue conversions on the array size expression.
1609 if (ArraySize && !ArraySize->isRValue()) {
1610 ExprResult Result = DefaultLvalueConversion(ArraySize);
1611 if (Result.isInvalid())
1614 ArraySize = Result.get();
1617 // C99 6.7.5.2p1: The size expression shall have integer type.
1618 // C++11 allows contextual conversions to such types.
1619 if (!getLangOpts().CPlusPlus11 &&
1620 ArraySize && !ArraySize->isTypeDependent() &&
1621 !ArraySize->getType()->isIntegralOrUnscopedEnumerationType()) {
1622 Diag(ArraySize->getLocStart(), diag::err_array_size_non_int)
1623 << ArraySize->getType() << ArraySize->getSourceRange();
1627 llvm::APSInt ConstVal(Context.getTypeSize(Context.getSizeType()));
1629 if (ASM == ArrayType::Star)
1630 T = Context.getVariableArrayType(T, nullptr, ASM, Quals, Brackets);
1632 T = Context.getIncompleteArrayType(T, ASM, Quals);
1633 } else if (ArraySize->isTypeDependent() || ArraySize->isValueDependent()) {
1634 T = Context.getDependentSizedArrayType(T, ArraySize, ASM, Quals, Brackets);
1635 } else if ((!T->isDependentType() && !T->isIncompleteType() &&
1636 !T->isConstantSizeType()) ||
1637 isArraySizeVLA(*this, ArraySize, ConstVal)) {
1638 // Even in C++11, don't allow contextual conversions in the array bound
1640 if (getLangOpts().CPlusPlus11 &&
1641 !ArraySize->getType()->isIntegralOrUnscopedEnumerationType()) {
1642 Diag(ArraySize->getLocStart(), diag::err_array_size_non_int)
1643 << ArraySize->getType() << ArraySize->getSourceRange();
1647 // C99: an array with an element type that has a non-constant-size is a VLA.
1648 // C99: an array with a non-ICE size is a VLA. We accept any expression
1649 // that we can fold to a non-zero positive value as an extension.
1650 T = Context.getVariableArrayType(T, ArraySize, ASM, Quals, Brackets);
1652 // C99 6.7.5.2p1: If the expression is a constant expression, it shall
1653 // have a value greater than zero.
1654 if (ConstVal.isSigned() && ConstVal.isNegative()) {
1656 Diag(ArraySize->getLocStart(), diag::err_decl_negative_array_size)
1657 << getPrintableNameForEntity(Entity) << ArraySize->getSourceRange();
1659 Diag(ArraySize->getLocStart(), diag::err_typecheck_negative_array_size)
1660 << ArraySize->getSourceRange();
1663 if (ConstVal == 0) {
1664 // GCC accepts zero sized static arrays. We allow them when
1665 // we're not in a SFINAE context.
1666 Diag(ArraySize->getLocStart(),
1667 isSFINAEContext()? diag::err_typecheck_zero_array_size
1668 : diag::ext_typecheck_zero_array_size)
1669 << ArraySize->getSourceRange();
1671 if (ASM == ArrayType::Static) {
1672 Diag(ArraySize->getLocStart(),
1673 diag::warn_typecheck_zero_static_array_size)
1674 << ArraySize->getSourceRange();
1675 ASM = ArrayType::Normal;
1677 } else if (!T->isDependentType() && !T->isVariablyModifiedType() &&
1678 !T->isIncompleteType() && !T->isUndeducedType()) {
1679 // Is the array too large?
1680 unsigned ActiveSizeBits
1681 = ConstantArrayType::getNumAddressingBits(Context, T, ConstVal);
1682 if (ActiveSizeBits > ConstantArrayType::getMaxSizeBits(Context)) {
1683 Diag(ArraySize->getLocStart(), diag::err_array_too_large)
1684 << ConstVal.toString(10)
1685 << ArraySize->getSourceRange();
1690 T = Context.getConstantArrayType(T, ConstVal, ASM, Quals);
1693 // OpenCL v1.2 s6.9.d: variable length arrays are not supported.
1694 if (getLangOpts().OpenCL && T->isVariableArrayType()) {
1695 Diag(Loc, diag::err_opencl_vla);
1698 // If this is not C99, extwarn about VLA's and C99 array size modifiers.
1699 if (!getLangOpts().C99) {
1700 if (T->isVariableArrayType()) {
1701 // Prohibit the use of non-POD types in VLAs.
1702 QualType BaseT = Context.getBaseElementType(T);
1703 if (!T->isDependentType() &&
1704 !RequireCompleteType(Loc, BaseT, 0) &&
1705 !BaseT.isPODType(Context) &&
1706 !BaseT->isObjCLifetimeType()) {
1707 Diag(Loc, diag::err_vla_non_pod)
1711 // Prohibit the use of VLAs during template argument deduction.
1712 else if (isSFINAEContext()) {
1713 Diag(Loc, diag::err_vla_in_sfinae);
1716 // Just extwarn about VLAs.
1718 Diag(Loc, diag::ext_vla);
1719 } else if (ASM != ArrayType::Normal || Quals != 0)
1721 getLangOpts().CPlusPlus? diag::err_c99_array_usage_cxx
1722 : diag::ext_c99_array_usage) << ASM;
1725 if (T->isVariableArrayType()) {
1726 // Warn about VLAs for -Wvla.
1727 Diag(Loc, diag::warn_vla_used);
1733 /// \brief Build an ext-vector type.
1735 /// Run the required checks for the extended vector type.
1736 QualType Sema::BuildExtVectorType(QualType T, Expr *ArraySize,
1737 SourceLocation AttrLoc) {
1738 // unlike gcc's vector_size attribute, we do not allow vectors to be defined
1739 // in conjunction with complex types (pointers, arrays, functions, etc.).
1740 if (!T->isDependentType() &&
1741 !T->isIntegerType() && !T->isRealFloatingType()) {
1742 Diag(AttrLoc, diag::err_attribute_invalid_vector_type) << T;
1746 if (!ArraySize->isTypeDependent() && !ArraySize->isValueDependent()) {
1747 llvm::APSInt vecSize(32);
1748 if (!ArraySize->isIntegerConstantExpr(vecSize, Context)) {
1749 Diag(AttrLoc, diag::err_attribute_argument_type)
1750 << "ext_vector_type" << AANT_ArgumentIntegerConstant
1751 << ArraySize->getSourceRange();
1755 // unlike gcc's vector_size attribute, the size is specified as the
1756 // number of elements, not the number of bytes.
1757 unsigned vectorSize = static_cast<unsigned>(vecSize.getZExtValue());
1759 if (vectorSize == 0) {
1760 Diag(AttrLoc, diag::err_attribute_zero_size)
1761 << ArraySize->getSourceRange();
1765 if (VectorType::isVectorSizeTooLarge(vectorSize)) {
1766 Diag(AttrLoc, diag::err_attribute_size_too_large)
1767 << ArraySize->getSourceRange();
1771 return Context.getExtVectorType(T, vectorSize);
1774 return Context.getDependentSizedExtVectorType(T, ArraySize, AttrLoc);
1777 bool Sema::CheckFunctionReturnType(QualType T, SourceLocation Loc) {
1778 if (T->isArrayType() || T->isFunctionType()) {
1779 Diag(Loc, diag::err_func_returning_array_function)
1780 << T->isFunctionType() << T;
1784 // Functions cannot return half FP.
1785 if (T->isHalfType() && !getLangOpts().HalfArgsAndReturns) {
1786 Diag(Loc, diag::err_parameters_retval_cannot_have_fp16_type) << 1 <<
1787 FixItHint::CreateInsertion(Loc, "*");
1791 // Methods cannot return interface types. All ObjC objects are
1792 // passed by reference.
1793 if (T->isObjCObjectType()) {
1794 Diag(Loc, diag::err_object_cannot_be_passed_returned_by_value) << 0 << T;
1801 QualType Sema::BuildFunctionType(QualType T,
1802 MutableArrayRef<QualType> ParamTypes,
1803 SourceLocation Loc, DeclarationName Entity,
1804 const FunctionProtoType::ExtProtoInfo &EPI) {
1805 bool Invalid = false;
1807 Invalid |= CheckFunctionReturnType(T, Loc);
1809 for (unsigned Idx = 0, Cnt = ParamTypes.size(); Idx < Cnt; ++Idx) {
1810 // FIXME: Loc is too inprecise here, should use proper locations for args.
1811 QualType ParamType = Context.getAdjustedParameterType(ParamTypes[Idx]);
1812 if (ParamType->isVoidType()) {
1813 Diag(Loc, diag::err_param_with_void_type);
1815 } else if (ParamType->isHalfType() && !getLangOpts().HalfArgsAndReturns) {
1816 // Disallow half FP arguments.
1817 Diag(Loc, diag::err_parameters_retval_cannot_have_fp16_type) << 0 <<
1818 FixItHint::CreateInsertion(Loc, "*");
1822 ParamTypes[Idx] = ParamType;
1828 return Context.getFunctionType(T, ParamTypes, EPI);
1831 /// \brief Build a member pointer type \c T Class::*.
1833 /// \param T the type to which the member pointer refers.
1834 /// \param Class the class type into which the member pointer points.
1835 /// \param Loc the location where this type begins
1836 /// \param Entity the name of the entity that will have this member pointer type
1838 /// \returns a member pointer type, if successful, or a NULL type if there was
1840 QualType Sema::BuildMemberPointerType(QualType T, QualType Class,
1842 DeclarationName Entity) {
1843 // Verify that we're not building a pointer to pointer to function with
1844 // exception specification.
1845 if (CheckDistantExceptionSpec(T)) {
1846 Diag(Loc, diag::err_distant_exception_spec);
1850 // C++ 8.3.3p3: A pointer to member shall not point to ... a member
1851 // with reference type, or "cv void."
1852 if (T->isReferenceType()) {
1853 Diag(Loc, diag::err_illegal_decl_mempointer_to_reference)
1854 << getPrintableNameForEntity(Entity) << T;
1858 if (T->isVoidType()) {
1859 Diag(Loc, diag::err_illegal_decl_mempointer_to_void)
1860 << getPrintableNameForEntity(Entity);
1864 if (!Class->isDependentType() && !Class->isRecordType()) {
1865 Diag(Loc, diag::err_mempointer_in_nonclass_type) << Class;
1869 // Adjust the default free function calling convention to the default method
1870 // calling convention.
1871 if (T->isFunctionType())
1872 adjustMemberFunctionCC(T, /*IsStatic=*/false);
1874 return Context.getMemberPointerType(T, Class.getTypePtr());
1877 /// \brief Build a block pointer type.
1879 /// \param T The type to which we'll be building a block pointer.
1881 /// \param Loc The source location, used for diagnostics.
1883 /// \param Entity The name of the entity that involves the block pointer
1886 /// \returns A suitable block pointer type, if there are no
1887 /// errors. Otherwise, returns a NULL type.
1888 QualType Sema::BuildBlockPointerType(QualType T,
1890 DeclarationName Entity) {
1891 if (!T->isFunctionType()) {
1892 Diag(Loc, diag::err_nonfunction_block_type);
1896 if (checkQualifiedFunction(*this, T, Loc, QFK_BlockPointer))
1899 return Context.getBlockPointerType(T);
1902 QualType Sema::GetTypeFromParser(ParsedType Ty, TypeSourceInfo **TInfo) {
1903 QualType QT = Ty.get();
1905 if (TInfo) *TInfo = nullptr;
1909 TypeSourceInfo *DI = nullptr;
1910 if (const LocInfoType *LIT = dyn_cast<LocInfoType>(QT)) {
1911 QT = LIT->getType();
1912 DI = LIT->getTypeSourceInfo();
1915 if (TInfo) *TInfo = DI;
1919 static void transferARCOwnershipToDeclaratorChunk(TypeProcessingState &state,
1920 Qualifiers::ObjCLifetime ownership,
1921 unsigned chunkIndex);
1923 /// Given that this is the declaration of a parameter under ARC,
1924 /// attempt to infer attributes and such for pointer-to-whatever
1926 static void inferARCWriteback(TypeProcessingState &state,
1927 QualType &declSpecType) {
1928 Sema &S = state.getSema();
1929 Declarator &declarator = state.getDeclarator();
1931 // TODO: should we care about decl qualifiers?
1933 // Check whether the declarator has the expected form. We walk
1934 // from the inside out in order to make the block logic work.
1935 unsigned outermostPointerIndex = 0;
1936 bool isBlockPointer = false;
1937 unsigned numPointers = 0;
1938 for (unsigned i = 0, e = declarator.getNumTypeObjects(); i != e; ++i) {
1939 unsigned chunkIndex = i;
1940 DeclaratorChunk &chunk = declarator.getTypeObject(chunkIndex);
1941 switch (chunk.Kind) {
1942 case DeclaratorChunk::Paren:
1946 case DeclaratorChunk::Reference:
1947 case DeclaratorChunk::Pointer:
1948 // Count the number of pointers. Treat references
1949 // interchangeably as pointers; if they're mis-ordered, normal
1950 // type building will discover that.
1951 outermostPointerIndex = chunkIndex;
1955 case DeclaratorChunk::BlockPointer:
1956 // If we have a pointer to block pointer, that's an acceptable
1957 // indirect reference; anything else is not an application of
1959 if (numPointers != 1) return;
1961 outermostPointerIndex = chunkIndex;
1962 isBlockPointer = true;
1964 // We don't care about pointer structure in return values here.
1967 case DeclaratorChunk::Array: // suppress if written (id[])?
1968 case DeclaratorChunk::Function:
1969 case DeclaratorChunk::MemberPointer:
1975 // If we have *one* pointer, then we want to throw the qualifier on
1976 // the declaration-specifiers, which means that it needs to be a
1977 // retainable object type.
1978 if (numPointers == 1) {
1979 // If it's not a retainable object type, the rule doesn't apply.
1980 if (!declSpecType->isObjCRetainableType()) return;
1982 // If it already has lifetime, don't do anything.
1983 if (declSpecType.getObjCLifetime()) return;
1985 // Otherwise, modify the type in-place.
1988 if (declSpecType->isObjCARCImplicitlyUnretainedType())
1989 qs.addObjCLifetime(Qualifiers::OCL_ExplicitNone);
1991 qs.addObjCLifetime(Qualifiers::OCL_Autoreleasing);
1992 declSpecType = S.Context.getQualifiedType(declSpecType, qs);
1994 // If we have *two* pointers, then we want to throw the qualifier on
1995 // the outermost pointer.
1996 } else if (numPointers == 2) {
1997 // If we don't have a block pointer, we need to check whether the
1998 // declaration-specifiers gave us something that will turn into a
1999 // retainable object pointer after we slap the first pointer on it.
2000 if (!isBlockPointer && !declSpecType->isObjCObjectType())
2003 // Look for an explicit lifetime attribute there.
2004 DeclaratorChunk &chunk = declarator.getTypeObject(outermostPointerIndex);
2005 if (chunk.Kind != DeclaratorChunk::Pointer &&
2006 chunk.Kind != DeclaratorChunk::BlockPointer)
2008 for (const AttributeList *attr = chunk.getAttrs(); attr;
2009 attr = attr->getNext())
2010 if (attr->getKind() == AttributeList::AT_ObjCOwnership)
2013 transferARCOwnershipToDeclaratorChunk(state, Qualifiers::OCL_Autoreleasing,
2014 outermostPointerIndex);
2016 // Any other number of pointers/references does not trigger the rule.
2019 // TODO: mark whether we did this inference?
2022 void Sema::diagnoseIgnoredQualifiers(unsigned DiagID, unsigned Quals,
2023 SourceLocation FallbackLoc,
2024 SourceLocation ConstQualLoc,
2025 SourceLocation VolatileQualLoc,
2026 SourceLocation RestrictQualLoc,
2027 SourceLocation AtomicQualLoc) {
2035 } const QualKinds[4] = {
2036 { DeclSpec::TQ_const, "const", ConstQualLoc },
2037 { DeclSpec::TQ_volatile, "volatile", VolatileQualLoc },
2038 { DeclSpec::TQ_restrict, "restrict", RestrictQualLoc },
2039 { DeclSpec::TQ_atomic, "_Atomic", AtomicQualLoc }
2042 SmallString<32> QualStr;
2043 unsigned NumQuals = 0;
2045 FixItHint FixIts[4];
2047 // Build a string naming the redundant qualifiers.
2048 for (unsigned I = 0; I != 4; ++I) {
2049 if (Quals & QualKinds[I].Mask) {
2050 if (!QualStr.empty()) QualStr += ' ';
2051 QualStr += QualKinds[I].Name;
2053 // If we have a location for the qualifier, offer a fixit.
2054 SourceLocation QualLoc = QualKinds[I].Loc;
2055 if (!QualLoc.isInvalid()) {
2056 FixIts[NumQuals] = FixItHint::CreateRemoval(QualLoc);
2057 if (Loc.isInvalid() ||
2058 getSourceManager().isBeforeInTranslationUnit(QualLoc, Loc))
2066 Diag(Loc.isInvalid() ? FallbackLoc : Loc, DiagID)
2067 << QualStr << NumQuals << FixIts[0] << FixIts[1] << FixIts[2] << FixIts[3];
2070 // Diagnose pointless type qualifiers on the return type of a function.
2071 static void diagnoseRedundantReturnTypeQualifiers(Sema &S, QualType RetTy,
2073 unsigned FunctionChunkIndex) {
2074 if (D.getTypeObject(FunctionChunkIndex).Fun.hasTrailingReturnType()) {
2075 // FIXME: TypeSourceInfo doesn't preserve location information for
2077 S.diagnoseIgnoredQualifiers(diag::warn_qual_return_type,
2078 RetTy.getLocalCVRQualifiers(),
2079 D.getIdentifierLoc());
2083 for (unsigned OuterChunkIndex = FunctionChunkIndex + 1,
2084 End = D.getNumTypeObjects();
2085 OuterChunkIndex != End; ++OuterChunkIndex) {
2086 DeclaratorChunk &OuterChunk = D.getTypeObject(OuterChunkIndex);
2087 switch (OuterChunk.Kind) {
2088 case DeclaratorChunk::Paren:
2091 case DeclaratorChunk::Pointer: {
2092 DeclaratorChunk::PointerTypeInfo &PTI = OuterChunk.Ptr;
2093 S.diagnoseIgnoredQualifiers(
2094 diag::warn_qual_return_type,
2097 SourceLocation::getFromRawEncoding(PTI.ConstQualLoc),
2098 SourceLocation::getFromRawEncoding(PTI.VolatileQualLoc),
2099 SourceLocation::getFromRawEncoding(PTI.RestrictQualLoc),
2100 SourceLocation::getFromRawEncoding(PTI.AtomicQualLoc));
2104 case DeclaratorChunk::Function:
2105 case DeclaratorChunk::BlockPointer:
2106 case DeclaratorChunk::Reference:
2107 case DeclaratorChunk::Array:
2108 case DeclaratorChunk::MemberPointer:
2109 // FIXME: We can't currently provide an accurate source location and a
2110 // fix-it hint for these.
2111 unsigned AtomicQual = RetTy->isAtomicType() ? DeclSpec::TQ_atomic : 0;
2112 S.diagnoseIgnoredQualifiers(diag::warn_qual_return_type,
2113 RetTy.getCVRQualifiers() | AtomicQual,
2114 D.getIdentifierLoc());
2118 llvm_unreachable("unknown declarator chunk kind");
2121 // If the qualifiers come from a conversion function type, don't diagnose
2122 // them -- they're not necessarily redundant, since such a conversion
2123 // operator can be explicitly called as "x.operator const int()".
2124 if (D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId)
2127 // Just parens all the way out to the decl specifiers. Diagnose any qualifiers
2128 // which are present there.
2129 S.diagnoseIgnoredQualifiers(diag::warn_qual_return_type,
2130 D.getDeclSpec().getTypeQualifiers(),
2131 D.getIdentifierLoc(),
2132 D.getDeclSpec().getConstSpecLoc(),
2133 D.getDeclSpec().getVolatileSpecLoc(),
2134 D.getDeclSpec().getRestrictSpecLoc(),
2135 D.getDeclSpec().getAtomicSpecLoc());
2138 static QualType GetDeclSpecTypeForDeclarator(TypeProcessingState &state,
2139 TypeSourceInfo *&ReturnTypeInfo) {
2140 Sema &SemaRef = state.getSema();
2141 Declarator &D = state.getDeclarator();
2143 ReturnTypeInfo = nullptr;
2145 // The TagDecl owned by the DeclSpec.
2146 TagDecl *OwnedTagDecl = nullptr;
2148 bool ContainsPlaceholderType = false;
2150 switch (D.getName().getKind()) {
2151 case UnqualifiedId::IK_ImplicitSelfParam:
2152 case UnqualifiedId::IK_OperatorFunctionId:
2153 case UnqualifiedId::IK_Identifier:
2154 case UnqualifiedId::IK_LiteralOperatorId:
2155 case UnqualifiedId::IK_TemplateId:
2156 T = ConvertDeclSpecToType(state);
2157 ContainsPlaceholderType = D.getDeclSpec().containsPlaceholderType();
2159 if (!D.isInvalidType() && D.getDeclSpec().isTypeSpecOwned()) {
2160 OwnedTagDecl = cast<TagDecl>(D.getDeclSpec().getRepAsDecl());
2161 // Owned declaration is embedded in declarator.
2162 OwnedTagDecl->setEmbeddedInDeclarator(true);
2166 case UnqualifiedId::IK_ConstructorName:
2167 case UnqualifiedId::IK_ConstructorTemplateId:
2168 case UnqualifiedId::IK_DestructorName:
2169 // Constructors and destructors don't have return types. Use
2171 T = SemaRef.Context.VoidTy;
2172 if (AttributeList *attrs = D.getDeclSpec().getAttributes().getList())
2173 processTypeAttrs(state, T, TAL_DeclSpec, attrs);
2176 case UnqualifiedId::IK_ConversionFunctionId:
2177 // The result type of a conversion function is the type that it
2179 T = SemaRef.GetTypeFromParser(D.getName().ConversionFunctionId,
2181 ContainsPlaceholderType = T->getContainedAutoType();
2185 if (D.getAttributes())
2186 distributeTypeAttrsFromDeclarator(state, T);
2188 // C++11 [dcl.spec.auto]p5: reject 'auto' if it is not in an allowed context.
2189 // In C++11, a function declarator using 'auto' must have a trailing return
2190 // type (this is checked later) and we can skip this. In other languages
2191 // using auto, we need to check regardless.
2192 // C++14 In generic lambdas allow 'auto' in their parameters.
2193 if (ContainsPlaceholderType &&
2194 (!SemaRef.getLangOpts().CPlusPlus11 || !D.isFunctionDeclarator())) {
2197 switch (D.getContext()) {
2198 case Declarator::KNRTypeListContext:
2199 llvm_unreachable("K&R type lists aren't allowed in C++");
2200 case Declarator::LambdaExprContext:
2201 llvm_unreachable("Can't specify a type specifier in lambda grammar");
2202 case Declarator::ObjCParameterContext:
2203 case Declarator::ObjCResultContext:
2204 case Declarator::PrototypeContext:
2207 case Declarator::LambdaExprParameterContext:
2208 if (!(SemaRef.getLangOpts().CPlusPlus14
2209 && D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_auto))
2212 case Declarator::MemberContext:
2213 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_static)
2215 switch (cast<TagDecl>(SemaRef.CurContext)->getTagKind()) {
2216 case TTK_Enum: llvm_unreachable("unhandled tag kind");
2217 case TTK_Struct: Error = 1; /* Struct member */ break;
2218 case TTK_Union: Error = 2; /* Union member */ break;
2219 case TTK_Class: Error = 3; /* Class member */ break;
2220 case TTK_Interface: Error = 4; /* Interface member */ break;
2223 case Declarator::CXXCatchContext:
2224 case Declarator::ObjCCatchContext:
2225 Error = 5; // Exception declaration
2227 case Declarator::TemplateParamContext:
2228 Error = 6; // Template parameter
2230 case Declarator::BlockLiteralContext:
2231 Error = 7; // Block literal
2233 case Declarator::TemplateTypeArgContext:
2234 Error = 8; // Template type argument
2236 case Declarator::AliasDeclContext:
2237 case Declarator::AliasTemplateContext:
2238 Error = 10; // Type alias
2240 case Declarator::TrailingReturnContext:
2241 if (!SemaRef.getLangOpts().CPlusPlus14)
2242 Error = 11; // Function return type
2244 case Declarator::ConversionIdContext:
2245 if (!SemaRef.getLangOpts().CPlusPlus14)
2246 Error = 12; // conversion-type-id
2248 case Declarator::TypeNameContext:
2249 Error = 13; // Generic
2251 case Declarator::FileContext:
2252 case Declarator::BlockContext:
2253 case Declarator::ForContext:
2254 case Declarator::ConditionContext:
2255 case Declarator::CXXNewContext:
2259 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef)
2262 // In Objective-C it is an error to use 'auto' on a function declarator.
2263 if (D.isFunctionDeclarator())
2266 // C++11 [dcl.spec.auto]p2: 'auto' is always fine if the declarator
2267 // contains a trailing return type. That is only legal at the outermost
2268 // level. Check all declarator chunks (outermost first) anyway, to give
2269 // better diagnostics.
2270 if (SemaRef.getLangOpts().CPlusPlus11 && Error != -1) {
2271 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) {
2272 unsigned chunkIndex = e - i - 1;
2273 state.setCurrentChunkIndex(chunkIndex);
2274 DeclaratorChunk &DeclType = D.getTypeObject(chunkIndex);
2275 if (DeclType.Kind == DeclaratorChunk::Function) {
2276 const DeclaratorChunk::FunctionTypeInfo &FTI = DeclType.Fun;
2277 if (FTI.hasTrailingReturnType()) {
2285 SourceRange AutoRange = D.getDeclSpec().getTypeSpecTypeLoc();
2286 if (D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId)
2287 AutoRange = D.getName().getSourceRange();
2290 const bool IsDeclTypeAuto =
2291 D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_decltype_auto;
2292 SemaRef.Diag(AutoRange.getBegin(), diag::err_auto_not_allowed)
2293 << IsDeclTypeAuto << Error << AutoRange;
2294 T = SemaRef.Context.IntTy;
2295 D.setInvalidType(true);
2297 SemaRef.Diag(AutoRange.getBegin(),
2298 diag::warn_cxx98_compat_auto_type_specifier)
2302 if (SemaRef.getLangOpts().CPlusPlus &&
2303 OwnedTagDecl && OwnedTagDecl->isCompleteDefinition()) {
2304 // Check the contexts where C++ forbids the declaration of a new class
2305 // or enumeration in a type-specifier-seq.
2306 switch (D.getContext()) {
2307 case Declarator::TrailingReturnContext:
2308 // Class and enumeration definitions are syntactically not allowed in
2309 // trailing return types.
2310 llvm_unreachable("parser should not have allowed this");
2312 case Declarator::FileContext:
2313 case Declarator::MemberContext:
2314 case Declarator::BlockContext:
2315 case Declarator::ForContext:
2316 case Declarator::BlockLiteralContext:
2317 case Declarator::LambdaExprContext:
2318 // C++11 [dcl.type]p3:
2319 // A type-specifier-seq shall not define a class or enumeration unless
2320 // it appears in the type-id of an alias-declaration (7.1.3) that is not
2321 // the declaration of a template-declaration.
2322 case Declarator::AliasDeclContext:
2324 case Declarator::AliasTemplateContext:
2325 SemaRef.Diag(OwnedTagDecl->getLocation(),
2326 diag::err_type_defined_in_alias_template)
2327 << SemaRef.Context.getTypeDeclType(OwnedTagDecl);
2328 D.setInvalidType(true);
2330 case Declarator::TypeNameContext:
2331 case Declarator::ConversionIdContext:
2332 case Declarator::TemplateParamContext:
2333 case Declarator::CXXNewContext:
2334 case Declarator::CXXCatchContext:
2335 case Declarator::ObjCCatchContext:
2336 case Declarator::TemplateTypeArgContext:
2337 SemaRef.Diag(OwnedTagDecl->getLocation(),
2338 diag::err_type_defined_in_type_specifier)
2339 << SemaRef.Context.getTypeDeclType(OwnedTagDecl);
2340 D.setInvalidType(true);
2342 case Declarator::PrototypeContext:
2343 case Declarator::LambdaExprParameterContext:
2344 case Declarator::ObjCParameterContext:
2345 case Declarator::ObjCResultContext:
2346 case Declarator::KNRTypeListContext:
2348 // Types shall not be defined in return or parameter types.
2349 SemaRef.Diag(OwnedTagDecl->getLocation(),
2350 diag::err_type_defined_in_param_type)
2351 << SemaRef.Context.getTypeDeclType(OwnedTagDecl);
2352 D.setInvalidType(true);
2354 case Declarator::ConditionContext:
2356 // The type-specifier-seq shall not contain typedef and shall not declare
2357 // a new class or enumeration.
2358 SemaRef.Diag(OwnedTagDecl->getLocation(),
2359 diag::err_type_defined_in_condition);
2360 D.setInvalidType(true);
2365 assert(!T.isNull() && "This function should not return a null type");
2369 /// Produce an appropriate diagnostic for an ambiguity between a function
2370 /// declarator and a C++ direct-initializer.
2371 static void warnAboutAmbiguousFunction(Sema &S, Declarator &D,
2372 DeclaratorChunk &DeclType, QualType RT) {
2373 const DeclaratorChunk::FunctionTypeInfo &FTI = DeclType.Fun;
2374 assert(FTI.isAmbiguous && "no direct-initializer / function ambiguity");
2376 // If the return type is void there is no ambiguity.
2377 if (RT->isVoidType())
2380 // An initializer for a non-class type can have at most one argument.
2381 if (!RT->isRecordType() && FTI.NumParams > 1)
2384 // An initializer for a reference must have exactly one argument.
2385 if (RT->isReferenceType() && FTI.NumParams != 1)
2388 // Only warn if this declarator is declaring a function at block scope, and
2389 // doesn't have a storage class (such as 'extern') specified.
2390 if (!D.isFunctionDeclarator() ||
2391 D.getFunctionDefinitionKind() != FDK_Declaration ||
2392 !S.CurContext->isFunctionOrMethod() ||
2393 D.getDeclSpec().getStorageClassSpec()
2394 != DeclSpec::SCS_unspecified)
2397 // Inside a condition, a direct initializer is not permitted. We allow one to
2398 // be parsed in order to give better diagnostics in condition parsing.
2399 if (D.getContext() == Declarator::ConditionContext)
2402 SourceRange ParenRange(DeclType.Loc, DeclType.EndLoc);
2404 S.Diag(DeclType.Loc,
2405 FTI.NumParams ? diag::warn_parens_disambiguated_as_function_declaration
2406 : diag::warn_empty_parens_are_function_decl)
2409 // If the declaration looks like:
2412 // and name lookup finds a function named 'f', then the ',' was
2413 // probably intended to be a ';'.
2414 if (!D.isFirstDeclarator() && D.getIdentifier()) {
2415 FullSourceLoc Comma(D.getCommaLoc(), S.SourceMgr);
2416 FullSourceLoc Name(D.getIdentifierLoc(), S.SourceMgr);
2417 if (Comma.getFileID() != Name.getFileID() ||
2418 Comma.getSpellingLineNumber() != Name.getSpellingLineNumber()) {
2419 LookupResult Result(S, D.getIdentifier(), SourceLocation(),
2420 Sema::LookupOrdinaryName);
2421 if (S.LookupName(Result, S.getCurScope()))
2422 S.Diag(D.getCommaLoc(), diag::note_empty_parens_function_call)
2423 << FixItHint::CreateReplacement(D.getCommaLoc(), ";")
2424 << D.getIdentifier();
2428 if (FTI.NumParams > 0) {
2429 // For a declaration with parameters, eg. "T var(T());", suggest adding
2430 // parens around the first parameter to turn the declaration into a
2431 // variable declaration.
2432 SourceRange Range = FTI.Params[0].Param->getSourceRange();
2433 SourceLocation B = Range.getBegin();
2434 SourceLocation E = S.getLocForEndOfToken(Range.getEnd());
2435 // FIXME: Maybe we should suggest adding braces instead of parens
2436 // in C++11 for classes that don't have an initializer_list constructor.
2437 S.Diag(B, diag::note_additional_parens_for_variable_declaration)
2438 << FixItHint::CreateInsertion(B, "(")
2439 << FixItHint::CreateInsertion(E, ")");
2441 // For a declaration without parameters, eg. "T var();", suggest replacing
2442 // the parens with an initializer to turn the declaration into a variable
2444 const CXXRecordDecl *RD = RT->getAsCXXRecordDecl();
2446 // Empty parens mean value-initialization, and no parens mean
2447 // default initialization. These are equivalent if the default
2448 // constructor is user-provided or if zero-initialization is a
2450 if (RD && RD->hasDefinition() &&
2451 (RD->isEmpty() || RD->hasUserProvidedDefaultConstructor()))
2452 S.Diag(DeclType.Loc, diag::note_empty_parens_default_ctor)
2453 << FixItHint::CreateRemoval(ParenRange);
2456 S.getFixItZeroInitializerForType(RT, ParenRange.getBegin());
2457 if (Init.empty() && S.LangOpts.CPlusPlus11)
2460 S.Diag(DeclType.Loc, diag::note_empty_parens_zero_initialize)
2461 << FixItHint::CreateReplacement(ParenRange, Init);
2466 /// Helper for figuring out the default CC for a function declarator type. If
2467 /// this is the outermost chunk, then we can determine the CC from the
2468 /// declarator context. If not, then this could be either a member function
2469 /// type or normal function type.
2471 getCCForDeclaratorChunk(Sema &S, Declarator &D,
2472 const DeclaratorChunk::FunctionTypeInfo &FTI,
2473 unsigned ChunkIndex) {
2474 assert(D.getTypeObject(ChunkIndex).Kind == DeclaratorChunk::Function);
2476 bool IsCXXInstanceMethod = false;
2478 if (S.getLangOpts().CPlusPlus) {
2479 // Look inwards through parentheses to see if this chunk will form a
2480 // member pointer type or if we're the declarator. Any type attributes
2481 // between here and there will override the CC we choose here.
2482 unsigned I = ChunkIndex;
2483 bool FoundNonParen = false;
2484 while (I && !FoundNonParen) {
2486 if (D.getTypeObject(I).Kind != DeclaratorChunk::Paren)
2487 FoundNonParen = true;
2490 if (FoundNonParen) {
2491 // If we're not the declarator, we're a regular function type unless we're
2492 // in a member pointer.
2493 IsCXXInstanceMethod =
2494 D.getTypeObject(I).Kind == DeclaratorChunk::MemberPointer;
2495 } else if (D.getContext() == Declarator::LambdaExprContext) {
2496 // This can only be a call operator for a lambda, which is an instance
2498 IsCXXInstanceMethod = true;
2500 // We're the innermost decl chunk, so must be a function declarator.
2501 assert(D.isFunctionDeclarator());
2503 // If we're inside a record, we're declaring a method, but it could be
2504 // explicitly or implicitly static.
2505 IsCXXInstanceMethod =
2506 D.isFirstDeclarationOfMember() &&
2507 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef &&
2508 !D.isStaticMember();
2512 CallingConv CC = S.Context.getDefaultCallingConvention(FTI.isVariadic,
2513 IsCXXInstanceMethod);
2515 // Attribute AT_OpenCLKernel affects the calling convention only on
2516 // the SPIR target, hence it cannot be treated as a calling
2517 // convention attribute. This is the simplest place to infer
2518 // "spir_kernel" for OpenCL kernels on SPIR.
2519 if (CC == CC_SpirFunction) {
2520 for (const AttributeList *Attr = D.getDeclSpec().getAttributes().getList();
2521 Attr; Attr = Attr->getNext()) {
2522 if (Attr->getKind() == AttributeList::AT_OpenCLKernel) {
2532 static TypeSourceInfo *GetFullTypeForDeclarator(TypeProcessingState &state,
2533 QualType declSpecType,
2534 TypeSourceInfo *TInfo) {
2535 // The TypeSourceInfo that this function returns will not be a null type.
2536 // If there is an error, this function will fill in a dummy type as fallback.
2537 QualType T = declSpecType;
2538 Declarator &D = state.getDeclarator();
2539 Sema &S = state.getSema();
2540 ASTContext &Context = S.Context;
2541 const LangOptions &LangOpts = S.getLangOpts();
2543 // The name we're declaring, if any.
2544 DeclarationName Name;
2545 if (D.getIdentifier())
2546 Name = D.getIdentifier();
2548 // Does this declaration declare a typedef-name?
2549 bool IsTypedefName =
2550 D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef ||
2551 D.getContext() == Declarator::AliasDeclContext ||
2552 D.getContext() == Declarator::AliasTemplateContext;
2554 // Does T refer to a function type with a cv-qualifier or a ref-qualifier?
2555 bool IsQualifiedFunction = T->isFunctionProtoType() &&
2556 (T->castAs<FunctionProtoType>()->getTypeQuals() != 0 ||
2557 T->castAs<FunctionProtoType>()->getRefQualifier() != RQ_None);
2559 // If T is 'decltype(auto)', the only declarators we can have are parens
2560 // and at most one function declarator if this is a function declaration.
2561 if (const AutoType *AT = T->getAs<AutoType>()) {
2562 if (AT->isDecltypeAuto()) {
2563 for (unsigned I = 0, E = D.getNumTypeObjects(); I != E; ++I) {
2564 unsigned Index = E - I - 1;
2565 DeclaratorChunk &DeclChunk = D.getTypeObject(Index);
2566 unsigned DiagId = diag::err_decltype_auto_compound_type;
2567 unsigned DiagKind = 0;
2568 switch (DeclChunk.Kind) {
2569 case DeclaratorChunk::Paren:
2571 case DeclaratorChunk::Function: {
2573 if (D.isFunctionDeclarationContext() &&
2574 D.isFunctionDeclarator(FnIndex) && FnIndex == Index)
2576 DiagId = diag::err_decltype_auto_function_declarator_not_declaration;
2579 case DeclaratorChunk::Pointer:
2580 case DeclaratorChunk::BlockPointer:
2581 case DeclaratorChunk::MemberPointer:
2584 case DeclaratorChunk::Reference:
2587 case DeclaratorChunk::Array:
2592 S.Diag(DeclChunk.Loc, DiagId) << DiagKind;
2593 D.setInvalidType(true);
2599 // Walk the DeclTypeInfo, building the recursive type as we go.
2600 // DeclTypeInfos are ordered from the identifier out, which is
2601 // opposite of what we want :).
2602 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) {
2603 unsigned chunkIndex = e - i - 1;
2604 state.setCurrentChunkIndex(chunkIndex);
2605 DeclaratorChunk &DeclType = D.getTypeObject(chunkIndex);
2606 IsQualifiedFunction &= DeclType.Kind == DeclaratorChunk::Paren;
2607 switch (DeclType.Kind) {
2608 case DeclaratorChunk::Paren:
2609 T = S.BuildParenType(T);
2611 case DeclaratorChunk::BlockPointer:
2612 // If blocks are disabled, emit an error.
2613 if (!LangOpts.Blocks)
2614 S.Diag(DeclType.Loc, diag::err_blocks_disable);
2616 T = S.BuildBlockPointerType(T, D.getIdentifierLoc(), Name);
2617 if (DeclType.Cls.TypeQuals)
2618 T = S.BuildQualifiedType(T, DeclType.Loc, DeclType.Cls.TypeQuals);
2620 case DeclaratorChunk::Pointer:
2621 // Verify that we're not building a pointer to pointer to function with
2622 // exception specification.
2623 if (LangOpts.CPlusPlus && S.CheckDistantExceptionSpec(T)) {
2624 S.Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec);
2625 D.setInvalidType(true);
2626 // Build the type anyway.
2628 if (LangOpts.ObjC1 && T->getAs<ObjCObjectType>()) {
2629 T = Context.getObjCObjectPointerType(T);
2630 if (DeclType.Ptr.TypeQuals)
2631 T = S.BuildQualifiedType(T, DeclType.Loc, DeclType.Ptr.TypeQuals);
2634 T = S.BuildPointerType(T, DeclType.Loc, Name);
2635 if (DeclType.Ptr.TypeQuals)
2636 T = S.BuildQualifiedType(T, DeclType.Loc, DeclType.Ptr.TypeQuals);
2639 case DeclaratorChunk::Reference: {
2640 // Verify that we're not building a reference to pointer to function with
2641 // exception specification.
2642 if (LangOpts.CPlusPlus && S.CheckDistantExceptionSpec(T)) {
2643 S.Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec);
2644 D.setInvalidType(true);
2645 // Build the type anyway.
2647 T = S.BuildReferenceType(T, DeclType.Ref.LValueRef, DeclType.Loc, Name);
2649 if (DeclType.Ref.HasRestrict)
2650 T = S.BuildQualifiedType(T, DeclType.Loc, Qualifiers::Restrict);
2653 case DeclaratorChunk::Array: {
2654 // Verify that we're not building an array of pointers to function with
2655 // exception specification.
2656 if (LangOpts.CPlusPlus && S.CheckDistantExceptionSpec(T)) {
2657 S.Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec);
2658 D.setInvalidType(true);
2659 // Build the type anyway.
2661 DeclaratorChunk::ArrayTypeInfo &ATI = DeclType.Arr;
2662 Expr *ArraySize = static_cast<Expr*>(ATI.NumElts);
2663 ArrayType::ArraySizeModifier ASM;
2665 ASM = ArrayType::Star;
2666 else if (ATI.hasStatic)
2667 ASM = ArrayType::Static;
2669 ASM = ArrayType::Normal;
2670 if (ASM == ArrayType::Star && !D.isPrototypeContext()) {
2671 // FIXME: This check isn't quite right: it allows star in prototypes
2672 // for function definitions, and disallows some edge cases detailed
2673 // in http://gcc.gnu.org/ml/gcc-patches/2009-02/msg00133.html
2674 S.Diag(DeclType.Loc, diag::err_array_star_outside_prototype);
2675 ASM = ArrayType::Normal;
2676 D.setInvalidType(true);
2679 // C99 6.7.5.2p1: The optional type qualifiers and the keyword static
2680 // shall appear only in a declaration of a function parameter with an
2682 if (ASM == ArrayType::Static || ATI.TypeQuals) {
2683 if (!(D.isPrototypeContext() ||
2684 D.getContext() == Declarator::KNRTypeListContext)) {
2685 S.Diag(DeclType.Loc, diag::err_array_static_outside_prototype) <<
2686 (ASM == ArrayType::Static ? "'static'" : "type qualifier");
2687 // Remove the 'static' and the type qualifiers.
2688 if (ASM == ArrayType::Static)
2689 ASM = ArrayType::Normal;
2691 D.setInvalidType(true);
2694 // C99 6.7.5.2p1: ... and then only in the outermost array type
2696 unsigned x = chunkIndex;
2698 // Walk outwards along the declarator chunks.
2700 const DeclaratorChunk &DC = D.getTypeObject(x);
2702 case DeclaratorChunk::Paren:
2704 case DeclaratorChunk::Array:
2705 case DeclaratorChunk::Pointer:
2706 case DeclaratorChunk::Reference:
2707 case DeclaratorChunk::MemberPointer:
2708 S.Diag(DeclType.Loc, diag::err_array_static_not_outermost) <<
2709 (ASM == ArrayType::Static ? "'static'" : "type qualifier");
2710 if (ASM == ArrayType::Static)
2711 ASM = ArrayType::Normal;
2713 D.setInvalidType(true);
2715 case DeclaratorChunk::Function:
2716 case DeclaratorChunk::BlockPointer:
2717 // These are invalid anyway, so just ignore.
2722 const AutoType *AT = T->getContainedAutoType();
2723 // Allow arrays of auto if we are a generic lambda parameter.
2724 // i.e. [](auto (&array)[5]) { return array[0]; }; OK
2725 if (AT && D.getContext() != Declarator::LambdaExprParameterContext) {
2726 // We've already diagnosed this for decltype(auto).
2727 if (!AT->isDecltypeAuto())
2728 S.Diag(DeclType.Loc, diag::err_illegal_decl_array_of_auto)
2729 << getPrintableNameForEntity(Name) << T;
2734 T = S.BuildArrayType(T, ASM, ArraySize, ATI.TypeQuals,
2735 SourceRange(DeclType.Loc, DeclType.EndLoc), Name);
2738 case DeclaratorChunk::Function: {
2739 // If the function declarator has a prototype (i.e. it is not () and
2740 // does not have a K&R-style identifier list), then the arguments are part
2741 // of the type, otherwise the argument list is ().
2742 const DeclaratorChunk::FunctionTypeInfo &FTI = DeclType.Fun;
2743 IsQualifiedFunction = FTI.TypeQuals || FTI.hasRefQualifier();
2745 // Check for auto functions and trailing return type and adjust the
2746 // return type accordingly.
2747 if (!D.isInvalidType()) {
2748 // trailing-return-type is only required if we're declaring a function,
2749 // and not, for instance, a pointer to a function.
2750 if (D.getDeclSpec().containsPlaceholderType() &&
2751 !FTI.hasTrailingReturnType() && chunkIndex == 0 &&
2752 !S.getLangOpts().CPlusPlus14) {
2753 S.Diag(D.getDeclSpec().getTypeSpecTypeLoc(),
2754 D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_auto
2755 ? diag::err_auto_missing_trailing_return
2756 : diag::err_deduced_return_type);
2758 D.setInvalidType(true);
2759 } else if (FTI.hasTrailingReturnType()) {
2760 // T must be exactly 'auto' at this point. See CWG issue 681.
2761 if (isa<ParenType>(T)) {
2762 S.Diag(D.getDeclSpec().getTypeSpecTypeLoc(),
2763 diag::err_trailing_return_in_parens)
2764 << T << D.getDeclSpec().getSourceRange();
2765 D.setInvalidType(true);
2766 } else if (D.getContext() != Declarator::LambdaExprContext &&
2767 (T.hasQualifiers() || !isa<AutoType>(T) ||
2768 cast<AutoType>(T)->isDecltypeAuto())) {
2769 S.Diag(D.getDeclSpec().getTypeSpecTypeLoc(),
2770 diag::err_trailing_return_without_auto)
2771 << T << D.getDeclSpec().getSourceRange();
2772 D.setInvalidType(true);
2774 T = S.GetTypeFromParser(FTI.getTrailingReturnType(), &TInfo);
2776 // An error occurred parsing the trailing return type.
2778 D.setInvalidType(true);
2783 // C99 6.7.5.3p1: The return type may not be a function or array type.
2784 // For conversion functions, we'll diagnose this particular error later.
2785 if ((T->isArrayType() || T->isFunctionType()) &&
2786 (D.getName().getKind() != UnqualifiedId::IK_ConversionFunctionId)) {
2787 unsigned diagID = diag::err_func_returning_array_function;
2788 // Last processing chunk in block context means this function chunk
2789 // represents the block.
2790 if (chunkIndex == 0 &&
2791 D.getContext() == Declarator::BlockLiteralContext)
2792 diagID = diag::err_block_returning_array_function;
2793 S.Diag(DeclType.Loc, diagID) << T->isFunctionType() << T;
2795 D.setInvalidType(true);
2798 // Do not allow returning half FP value.
2799 // FIXME: This really should be in BuildFunctionType.
2800 if (T->isHalfType()) {
2801 if (S.getLangOpts().OpenCL) {
2802 if (!S.getOpenCLOptions().cl_khr_fp16) {
2803 S.Diag(D.getIdentifierLoc(), diag::err_opencl_half_return) << T;
2804 D.setInvalidType(true);
2806 } else if (!S.getLangOpts().HalfArgsAndReturns) {
2807 S.Diag(D.getIdentifierLoc(),
2808 diag::err_parameters_retval_cannot_have_fp16_type) << 1;
2809 D.setInvalidType(true);
2813 // Methods cannot return interface types. All ObjC objects are
2814 // passed by reference.
2815 if (T->isObjCObjectType()) {
2816 SourceLocation DiagLoc, FixitLoc;
2818 DiagLoc = TInfo->getTypeLoc().getLocStart();
2819 FixitLoc = S.getLocForEndOfToken(TInfo->getTypeLoc().getLocEnd());
2821 DiagLoc = D.getDeclSpec().getTypeSpecTypeLoc();
2822 FixitLoc = S.getLocForEndOfToken(D.getDeclSpec().getLocEnd());
2824 S.Diag(DiagLoc, diag::err_object_cannot_be_passed_returned_by_value)
2826 << FixItHint::CreateInsertion(FixitLoc, "*");
2828 T = Context.getObjCObjectPointerType(T);
2831 TLB.pushFullCopy(TInfo->getTypeLoc());
2832 ObjCObjectPointerTypeLoc TLoc = TLB.push<ObjCObjectPointerTypeLoc>(T);
2833 TLoc.setStarLoc(FixitLoc);
2834 TInfo = TLB.getTypeSourceInfo(Context, T);
2837 D.setInvalidType(true);
2840 // cv-qualifiers on return types are pointless except when the type is a
2841 // class type in C++.
2842 if ((T.getCVRQualifiers() || T->isAtomicType()) &&
2843 !(S.getLangOpts().CPlusPlus &&
2844 (T->isDependentType() || T->isRecordType()))) {
2845 if (T->isVoidType() && !S.getLangOpts().CPlusPlus &&
2846 D.getFunctionDefinitionKind() == FDK_Definition) {
2847 // [6.9.1/3] qualified void return is invalid on a C
2848 // function definition. Apparently ok on declarations and
2849 // in C++ though (!)
2850 S.Diag(DeclType.Loc, diag::err_func_returning_qualified_void) << T;
2852 diagnoseRedundantReturnTypeQualifiers(S, T, D, chunkIndex);
2855 // Objective-C ARC ownership qualifiers are ignored on the function
2856 // return type (by type canonicalization). Complain if this attribute
2857 // was written here.
2858 if (T.getQualifiers().hasObjCLifetime()) {
2859 SourceLocation AttrLoc;
2860 if (chunkIndex + 1 < D.getNumTypeObjects()) {
2861 DeclaratorChunk ReturnTypeChunk = D.getTypeObject(chunkIndex + 1);
2862 for (const AttributeList *Attr = ReturnTypeChunk.getAttrs();
2863 Attr; Attr = Attr->getNext()) {
2864 if (Attr->getKind() == AttributeList::AT_ObjCOwnership) {
2865 AttrLoc = Attr->getLoc();
2870 if (AttrLoc.isInvalid()) {
2871 for (const AttributeList *Attr
2872 = D.getDeclSpec().getAttributes().getList();
2873 Attr; Attr = Attr->getNext()) {
2874 if (Attr->getKind() == AttributeList::AT_ObjCOwnership) {
2875 AttrLoc = Attr->getLoc();
2881 if (AttrLoc.isValid()) {
2882 // The ownership attributes are almost always written via
2884 // __strong/__weak/__autoreleasing/__unsafe_unretained.
2885 if (AttrLoc.isMacroID())
2886 AttrLoc = S.SourceMgr.getImmediateExpansionRange(AttrLoc).first;
2888 S.Diag(AttrLoc, diag::warn_arc_lifetime_result_type)
2889 << T.getQualifiers().getObjCLifetime();
2893 if (LangOpts.CPlusPlus && D.getDeclSpec().hasTagDefinition()) {
2895 // Types shall not be defined in return or parameter types.
2896 TagDecl *Tag = cast<TagDecl>(D.getDeclSpec().getRepAsDecl());
2897 S.Diag(Tag->getLocation(), diag::err_type_defined_in_result_type)
2898 << Context.getTypeDeclType(Tag);
2901 // Exception specs are not allowed in typedefs. Complain, but add it
2903 if (IsTypedefName && FTI.getExceptionSpecType())
2904 S.Diag(FTI.getExceptionSpecLoc(), diag::err_exception_spec_in_typedef)
2905 << (D.getContext() == Declarator::AliasDeclContext ||
2906 D.getContext() == Declarator::AliasTemplateContext);
2908 // If we see "T var();" or "T var(T());" at block scope, it is probably
2909 // an attempt to initialize a variable, not a function declaration.
2910 if (FTI.isAmbiguous)
2911 warnAboutAmbiguousFunction(S, D, DeclType, T);
2913 FunctionType::ExtInfo EI(getCCForDeclaratorChunk(S, D, FTI, chunkIndex));
2915 if (!FTI.NumParams && !FTI.isVariadic && !LangOpts.CPlusPlus) {
2916 // Simple void foo(), where the incoming T is the result type.
2917 T = Context.getFunctionNoProtoType(T, EI);
2919 // We allow a zero-parameter variadic function in C if the
2920 // function is marked with the "overloadable" attribute. Scan
2921 // for this attribute now.
2922 if (!FTI.NumParams && FTI.isVariadic && !LangOpts.CPlusPlus) {
2923 bool Overloadable = false;
2924 for (const AttributeList *Attrs = D.getAttributes();
2925 Attrs; Attrs = Attrs->getNext()) {
2926 if (Attrs->getKind() == AttributeList::AT_Overloadable) {
2927 Overloadable = true;
2933 S.Diag(FTI.getEllipsisLoc(), diag::err_ellipsis_first_param);
2936 if (FTI.NumParams && FTI.Params[0].Param == nullptr) {
2937 // C99 6.7.5.3p3: Reject int(x,y,z) when it's not a function
2939 S.Diag(FTI.Params[0].IdentLoc,
2940 diag::err_ident_list_in_fn_declaration);
2941 D.setInvalidType(true);
2942 // Recover by creating a K&R-style function type.
2943 T = Context.getFunctionNoProtoType(T, EI);
2947 FunctionProtoType::ExtProtoInfo EPI;
2949 EPI.Variadic = FTI.isVariadic;
2950 EPI.HasTrailingReturn = FTI.hasTrailingReturnType();
2951 EPI.TypeQuals = FTI.TypeQuals;
2952 EPI.RefQualifier = !FTI.hasRefQualifier()? RQ_None
2953 : FTI.RefQualifierIsLValueRef? RQ_LValue
2956 // Otherwise, we have a function with a parameter list that is
2957 // potentially variadic.
2958 SmallVector<QualType, 16> ParamTys;
2959 ParamTys.reserve(FTI.NumParams);
2961 SmallVector<bool, 16> ConsumedParameters;
2962 ConsumedParameters.reserve(FTI.NumParams);
2963 bool HasAnyConsumedParameters = false;
2965 for (unsigned i = 0, e = FTI.NumParams; i != e; ++i) {
2966 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.Params[i].Param);
2967 QualType ParamTy = Param->getType();
2968 assert(!ParamTy.isNull() && "Couldn't parse type?");
2970 // Look for 'void'. void is allowed only as a single parameter to a
2971 // function with no other parameters (C99 6.7.5.3p10). We record
2972 // int(void) as a FunctionProtoType with an empty parameter list.
2973 if (ParamTy->isVoidType()) {
2974 // If this is something like 'float(int, void)', reject it. 'void'
2975 // is an incomplete type (C99 6.2.5p19) and function decls cannot
2976 // have parameters of incomplete type.
2977 if (FTI.NumParams != 1 || FTI.isVariadic) {
2978 S.Diag(DeclType.Loc, diag::err_void_only_param);
2979 ParamTy = Context.IntTy;
2980 Param->setType(ParamTy);
2981 } else if (FTI.Params[i].Ident) {
2982 // Reject, but continue to parse 'int(void abc)'.
2983 S.Diag(FTI.Params[i].IdentLoc, diag::err_param_with_void_type);
2984 ParamTy = Context.IntTy;
2985 Param->setType(ParamTy);
2987 // Reject, but continue to parse 'float(const void)'.
2988 if (ParamTy.hasQualifiers())
2989 S.Diag(DeclType.Loc, diag::err_void_param_qualified);
2991 // Do not add 'void' to the list.
2994 } else if (ParamTy->isHalfType()) {
2995 // Disallow half FP parameters.
2996 // FIXME: This really should be in BuildFunctionType.
2997 if (S.getLangOpts().OpenCL) {
2998 if (!S.getOpenCLOptions().cl_khr_fp16) {
2999 S.Diag(Param->getLocation(),
3000 diag::err_opencl_half_param) << ParamTy;
3002 Param->setInvalidDecl();
3004 } else if (!S.getLangOpts().HalfArgsAndReturns) {
3005 S.Diag(Param->getLocation(),
3006 diag::err_parameters_retval_cannot_have_fp16_type) << 0;
3009 } else if (!FTI.hasPrototype) {
3010 if (ParamTy->isPromotableIntegerType()) {
3011 ParamTy = Context.getPromotedIntegerType(ParamTy);
3012 Param->setKNRPromoted(true);
3013 } else if (const BuiltinType* BTy = ParamTy->getAs<BuiltinType>()) {
3014 if (BTy->getKind() == BuiltinType::Float) {
3015 ParamTy = Context.DoubleTy;
3016 Param->setKNRPromoted(true);
3021 if (LangOpts.ObjCAutoRefCount) {
3022 bool Consumed = Param->hasAttr<NSConsumedAttr>();
3023 ConsumedParameters.push_back(Consumed);
3024 HasAnyConsumedParameters |= Consumed;
3027 ParamTys.push_back(ParamTy);
3030 if (HasAnyConsumedParameters)
3031 EPI.ConsumedParameters = ConsumedParameters.data();
3033 SmallVector<QualType, 4> Exceptions;
3034 SmallVector<ParsedType, 2> DynamicExceptions;
3035 SmallVector<SourceRange, 2> DynamicExceptionRanges;
3036 Expr *NoexceptExpr = nullptr;
3038 if (FTI.getExceptionSpecType() == EST_Dynamic) {
3039 // FIXME: It's rather inefficient to have to split into two vectors
3041 unsigned N = FTI.NumExceptions;
3042 DynamicExceptions.reserve(N);
3043 DynamicExceptionRanges.reserve(N);
3044 for (unsigned I = 0; I != N; ++I) {
3045 DynamicExceptions.push_back(FTI.Exceptions[I].Ty);
3046 DynamicExceptionRanges.push_back(FTI.Exceptions[I].Range);
3048 } else if (FTI.getExceptionSpecType() == EST_ComputedNoexcept) {
3049 NoexceptExpr = FTI.NoexceptExpr;
3052 S.checkExceptionSpecification(D.isFunctionDeclarationContext(),
3053 FTI.getExceptionSpecType(),
3055 DynamicExceptionRanges,
3060 T = Context.getFunctionType(T, ParamTys, EPI);
3065 case DeclaratorChunk::MemberPointer:
3066 // The scope spec must refer to a class, or be dependent.
3067 CXXScopeSpec &SS = DeclType.Mem.Scope();
3069 if (SS.isInvalid()) {
3070 // Avoid emitting extra errors if we already errored on the scope.
3071 D.setInvalidType(true);
3072 } else if (S.isDependentScopeSpecifier(SS) ||
3073 dyn_cast_or_null<CXXRecordDecl>(S.computeDeclContext(SS))) {
3074 NestedNameSpecifier *NNS = SS.getScopeRep();
3075 NestedNameSpecifier *NNSPrefix = NNS->getPrefix();
3076 switch (NNS->getKind()) {
3077 case NestedNameSpecifier::Identifier:
3078 ClsType = Context.getDependentNameType(ETK_None, NNSPrefix,
3079 NNS->getAsIdentifier());
3082 case NestedNameSpecifier::Namespace:
3083 case NestedNameSpecifier::NamespaceAlias:
3084 case NestedNameSpecifier::Global:
3085 case NestedNameSpecifier::Super:
3086 llvm_unreachable("Nested-name-specifier must name a type");
3088 case NestedNameSpecifier::TypeSpec:
3089 case NestedNameSpecifier::TypeSpecWithTemplate:
3090 ClsType = QualType(NNS->getAsType(), 0);
3091 // Note: if the NNS has a prefix and ClsType is a nondependent
3092 // TemplateSpecializationType, then the NNS prefix is NOT included
3093 // in ClsType; hence we wrap ClsType into an ElaboratedType.
3094 // NOTE: in particular, no wrap occurs if ClsType already is an
3095 // Elaborated, DependentName, or DependentTemplateSpecialization.
3096 if (NNSPrefix && isa<TemplateSpecializationType>(NNS->getAsType()))
3097 ClsType = Context.getElaboratedType(ETK_None, NNSPrefix, ClsType);
3101 S.Diag(DeclType.Mem.Scope().getBeginLoc(),
3102 diag::err_illegal_decl_mempointer_in_nonclass)
3103 << (D.getIdentifier() ? D.getIdentifier()->getName() : "type name")
3104 << DeclType.Mem.Scope().getRange();
3105 D.setInvalidType(true);
3108 if (!ClsType.isNull())
3109 T = S.BuildMemberPointerType(T, ClsType, DeclType.Loc,
3113 D.setInvalidType(true);
3114 } else if (DeclType.Mem.TypeQuals) {
3115 T = S.BuildQualifiedType(T, DeclType.Loc, DeclType.Mem.TypeQuals);
3121 D.setInvalidType(true);
3125 // See if there are any attributes on this declarator chunk.
3126 if (AttributeList *attrs = const_cast<AttributeList*>(DeclType.getAttrs()))
3127 processTypeAttrs(state, T, TAL_DeclChunk, attrs);
3130 assert(!T.isNull() && "T must not be null after this point");
3132 if (LangOpts.CPlusPlus && T->isFunctionType()) {
3133 const FunctionProtoType *FnTy = T->getAs<FunctionProtoType>();
3134 assert(FnTy && "Why oh why is there not a FunctionProtoType here?");
3137 // A cv-qualifier-seq shall only be part of the function type
3138 // for a nonstatic member function, the function type to which a pointer
3139 // to member refers, or the top-level function type of a function typedef
3142 // Core issue 547 also allows cv-qualifiers on function types that are
3143 // top-level template type arguments.
3145 if (!D.getCXXScopeSpec().isSet()) {
3146 FreeFunction = ((D.getContext() != Declarator::MemberContext &&
3147 D.getContext() != Declarator::LambdaExprContext) ||
3148 D.getDeclSpec().isFriendSpecified());
3150 DeclContext *DC = S.computeDeclContext(D.getCXXScopeSpec());
3151 FreeFunction = (DC && !DC->isRecord());
3154 // C++11 [dcl.fct]p6 (w/DR1417):
3155 // An attempt to specify a function type with a cv-qualifier-seq or a
3156 // ref-qualifier (including by typedef-name) is ill-formed unless it is:
3157 // - the function type for a non-static member function,
3158 // - the function type to which a pointer to member refers,
3159 // - the top-level function type of a function typedef declaration or
3160 // alias-declaration,
3161 // - the type-id in the default argument of a type-parameter, or
3162 // - the type-id of a template-argument for a type-parameter
3164 // FIXME: Checking this here is insufficient. We accept-invalid on:
3166 // template<typename T> struct S { void f(T); };
3167 // S<int() const> s;
3169 // ... for instance.
3170 if (IsQualifiedFunction &&
3172 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) &&
3174 D.getContext() != Declarator::TemplateTypeArgContext) {
3175 SourceLocation Loc = D.getLocStart();
3176 SourceRange RemovalRange;
3178 if (D.isFunctionDeclarator(I)) {
3179 SmallVector<SourceLocation, 4> RemovalLocs;
3180 const DeclaratorChunk &Chunk = D.getTypeObject(I);
3181 assert(Chunk.Kind == DeclaratorChunk::Function);
3182 if (Chunk.Fun.hasRefQualifier())
3183 RemovalLocs.push_back(Chunk.Fun.getRefQualifierLoc());
3184 if (Chunk.Fun.TypeQuals & Qualifiers::Const)
3185 RemovalLocs.push_back(Chunk.Fun.getConstQualifierLoc());
3186 if (Chunk.Fun.TypeQuals & Qualifiers::Volatile)
3187 RemovalLocs.push_back(Chunk.Fun.getVolatileQualifierLoc());
3188 if (Chunk.Fun.TypeQuals & Qualifiers::Restrict)
3189 RemovalLocs.push_back(Chunk.Fun.getRestrictQualifierLoc());
3190 if (!RemovalLocs.empty()) {
3191 std::sort(RemovalLocs.begin(), RemovalLocs.end(),
3192 BeforeThanCompare<SourceLocation>(S.getSourceManager()));
3193 RemovalRange = SourceRange(RemovalLocs.front(), RemovalLocs.back());
3194 Loc = RemovalLocs.front();
3198 S.Diag(Loc, diag::err_invalid_qualified_function_type)
3199 << FreeFunction << D.isFunctionDeclarator() << T
3200 << getFunctionQualifiersAsString(FnTy)
3201 << FixItHint::CreateRemoval(RemovalRange);
3203 // Strip the cv-qualifiers and ref-qualifiers from the type.
3204 FunctionProtoType::ExtProtoInfo EPI = FnTy->getExtProtoInfo();
3206 EPI.RefQualifier = RQ_None;
3208 T = Context.getFunctionType(FnTy->getReturnType(), FnTy->getParamTypes(),
3210 // Rebuild any parens around the identifier in the function type.
3211 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) {
3212 if (D.getTypeObject(i).Kind != DeclaratorChunk::Paren)
3214 T = S.BuildParenType(T);
3219 // Apply any undistributed attributes from the declarator.
3220 if (AttributeList *attrs = D.getAttributes())
3221 processTypeAttrs(state, T, TAL_DeclName, attrs);
3223 // Diagnose any ignored type attributes.
3224 state.diagnoseIgnoredTypeAttrs(T);
3226 // C++0x [dcl.constexpr]p9:
3227 // A constexpr specifier used in an object declaration declares the object
3229 if (D.getDeclSpec().isConstexprSpecified() && T->isObjectType()) {
3233 // If there was an ellipsis in the declarator, the declaration declares a
3234 // parameter pack whose type may be a pack expansion type.
3235 if (D.hasEllipsis()) {
3236 // C++0x [dcl.fct]p13:
3237 // A declarator-id or abstract-declarator containing an ellipsis shall
3238 // only be used in a parameter-declaration. Such a parameter-declaration
3239 // is a parameter pack (14.5.3). [...]
3240 switch (D.getContext()) {
3241 case Declarator::PrototypeContext:
3242 case Declarator::LambdaExprParameterContext:
3243 // C++0x [dcl.fct]p13:
3244 // [...] When it is part of a parameter-declaration-clause, the
3245 // parameter pack is a function parameter pack (14.5.3). The type T
3246 // of the declarator-id of the function parameter pack shall contain
3247 // a template parameter pack; each template parameter pack in T is
3248 // expanded by the function parameter pack.
3250 // We represent function parameter packs as function parameters whose
3251 // type is a pack expansion.
3252 if (!T->containsUnexpandedParameterPack()) {
3253 S.Diag(D.getEllipsisLoc(),
3254 diag::err_function_parameter_pack_without_parameter_packs)
3255 << T << D.getSourceRange();
3256 D.setEllipsisLoc(SourceLocation());
3258 T = Context.getPackExpansionType(T, None);
3261 case Declarator::TemplateParamContext:
3262 // C++0x [temp.param]p15:
3263 // If a template-parameter is a [...] is a parameter-declaration that
3264 // declares a parameter pack (8.3.5), then the template-parameter is a
3265 // template parameter pack (14.5.3).
3267 // Note: core issue 778 clarifies that, if there are any unexpanded
3268 // parameter packs in the type of the non-type template parameter, then
3269 // it expands those parameter packs.
3270 if (T->containsUnexpandedParameterPack())
3271 T = Context.getPackExpansionType(T, None);
3273 S.Diag(D.getEllipsisLoc(),
3274 LangOpts.CPlusPlus11
3275 ? diag::warn_cxx98_compat_variadic_templates
3276 : diag::ext_variadic_templates);
3279 case Declarator::FileContext:
3280 case Declarator::KNRTypeListContext:
3281 case Declarator::ObjCParameterContext: // FIXME: special diagnostic here?
3282 case Declarator::ObjCResultContext: // FIXME: special diagnostic here?
3283 case Declarator::TypeNameContext:
3284 case Declarator::CXXNewContext:
3285 case Declarator::AliasDeclContext:
3286 case Declarator::AliasTemplateContext:
3287 case Declarator::MemberContext:
3288 case Declarator::BlockContext:
3289 case Declarator::ForContext:
3290 case Declarator::ConditionContext:
3291 case Declarator::CXXCatchContext:
3292 case Declarator::ObjCCatchContext:
3293 case Declarator::BlockLiteralContext:
3294 case Declarator::LambdaExprContext:
3295 case Declarator::ConversionIdContext:
3296 case Declarator::TrailingReturnContext:
3297 case Declarator::TemplateTypeArgContext:
3298 // FIXME: We may want to allow parameter packs in block-literal contexts
3300 S.Diag(D.getEllipsisLoc(),
3301 diag::err_ellipsis_in_declarator_not_parameter);
3302 D.setEllipsisLoc(SourceLocation());
3307 assert(!T.isNull() && "T must not be null at the end of this function");
3308 if (D.isInvalidType())
3309 return Context.getTrivialTypeSourceInfo(T);
3311 return S.GetTypeSourceInfoForDeclarator(D, T, TInfo);
3314 /// GetTypeForDeclarator - Convert the type for the specified
3315 /// declarator to Type instances.
3317 /// The result of this call will never be null, but the associated
3318 /// type may be a null type if there's an unrecoverable error.
3319 TypeSourceInfo *Sema::GetTypeForDeclarator(Declarator &D, Scope *S) {
3320 // Determine the type of the declarator. Not all forms of declarator
3323 TypeProcessingState state(*this, D);
3325 TypeSourceInfo *ReturnTypeInfo = nullptr;
3326 QualType T = GetDeclSpecTypeForDeclarator(state, ReturnTypeInfo);
3328 if (D.isPrototypeContext() && getLangOpts().ObjCAutoRefCount)
3329 inferARCWriteback(state, T);
3331 return GetFullTypeForDeclarator(state, T, ReturnTypeInfo);
3334 static void transferARCOwnershipToDeclSpec(Sema &S,
3335 QualType &declSpecTy,
3336 Qualifiers::ObjCLifetime ownership) {
3337 if (declSpecTy->isObjCRetainableType() &&
3338 declSpecTy.getObjCLifetime() == Qualifiers::OCL_None) {
3340 qs.addObjCLifetime(ownership);
3341 declSpecTy = S.Context.getQualifiedType(declSpecTy, qs);
3345 static void transferARCOwnershipToDeclaratorChunk(TypeProcessingState &state,
3346 Qualifiers::ObjCLifetime ownership,
3347 unsigned chunkIndex) {
3348 Sema &S = state.getSema();
3349 Declarator &D = state.getDeclarator();
3351 // Look for an explicit lifetime attribute.
3352 DeclaratorChunk &chunk = D.getTypeObject(chunkIndex);
3353 for (const AttributeList *attr = chunk.getAttrs(); attr;
3354 attr = attr->getNext())
3355 if (attr->getKind() == AttributeList::AT_ObjCOwnership)
3358 const char *attrStr = nullptr;
3359 switch (ownership) {
3360 case Qualifiers::OCL_None: llvm_unreachable("no ownership!");
3361 case Qualifiers::OCL_ExplicitNone: attrStr = "none"; break;
3362 case Qualifiers::OCL_Strong: attrStr = "strong"; break;
3363 case Qualifiers::OCL_Weak: attrStr = "weak"; break;
3364 case Qualifiers::OCL_Autoreleasing: attrStr = "autoreleasing"; break;
3367 IdentifierLoc *Arg = new (S.Context) IdentifierLoc;
3368 Arg->Ident = &S.Context.Idents.get(attrStr);
3369 Arg->Loc = SourceLocation();
3371 ArgsUnion Args(Arg);
3373 // If there wasn't one, add one (with an invalid source location
3374 // so that we don't make an AttributedType for it).
3375 AttributeList *attr = D.getAttributePool()
3376 .create(&S.Context.Idents.get("objc_ownership"), SourceLocation(),
3377 /*scope*/ nullptr, SourceLocation(),
3378 /*args*/ &Args, 1, AttributeList::AS_GNU);
3379 spliceAttrIntoList(*attr, chunk.getAttrListRef());
3381 // TODO: mark whether we did this inference?
3384 /// \brief Used for transferring ownership in casts resulting in l-values.
3385 static void transferARCOwnership(TypeProcessingState &state,
3386 QualType &declSpecTy,
3387 Qualifiers::ObjCLifetime ownership) {
3388 Sema &S = state.getSema();
3389 Declarator &D = state.getDeclarator();
3392 bool hasIndirection = false;
3393 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) {
3394 DeclaratorChunk &chunk = D.getTypeObject(i);
3395 switch (chunk.Kind) {
3396 case DeclaratorChunk::Paren:
3400 case DeclaratorChunk::Array:
3401 case DeclaratorChunk::Reference:
3402 case DeclaratorChunk::Pointer:
3404 hasIndirection = true;
3408 case DeclaratorChunk::BlockPointer:
3410 transferARCOwnershipToDeclaratorChunk(state, ownership, i);
3413 case DeclaratorChunk::Function:
3414 case DeclaratorChunk::MemberPointer:
3422 DeclaratorChunk &chunk = D.getTypeObject(inner);
3423 if (chunk.Kind == DeclaratorChunk::Pointer) {
3424 if (declSpecTy->isObjCRetainableType())
3425 return transferARCOwnershipToDeclSpec(S, declSpecTy, ownership);
3426 if (declSpecTy->isObjCObjectType() && hasIndirection)
3427 return transferARCOwnershipToDeclaratorChunk(state, ownership, inner);
3429 assert(chunk.Kind == DeclaratorChunk::Array ||
3430 chunk.Kind == DeclaratorChunk::Reference);
3431 return transferARCOwnershipToDeclSpec(S, declSpecTy, ownership);
3435 TypeSourceInfo *Sema::GetTypeForDeclaratorCast(Declarator &D, QualType FromTy) {
3436 TypeProcessingState state(*this, D);
3438 TypeSourceInfo *ReturnTypeInfo = nullptr;
3439 QualType declSpecTy = GetDeclSpecTypeForDeclarator(state, ReturnTypeInfo);
3441 if (getLangOpts().ObjCAutoRefCount) {
3442 Qualifiers::ObjCLifetime ownership = Context.getInnerObjCOwnership(FromTy);
3443 if (ownership != Qualifiers::OCL_None)
3444 transferARCOwnership(state, declSpecTy, ownership);
3447 return GetFullTypeForDeclarator(state, declSpecTy, ReturnTypeInfo);
3450 /// Map an AttributedType::Kind to an AttributeList::Kind.
3451 static AttributeList::Kind getAttrListKind(AttributedType::Kind kind) {
3453 case AttributedType::attr_address_space:
3454 return AttributeList::AT_AddressSpace;
3455 case AttributedType::attr_regparm:
3456 return AttributeList::AT_Regparm;
3457 case AttributedType::attr_vector_size:
3458 return AttributeList::AT_VectorSize;
3459 case AttributedType::attr_neon_vector_type:
3460 return AttributeList::AT_NeonVectorType;
3461 case AttributedType::attr_neon_polyvector_type:
3462 return AttributeList::AT_NeonPolyVectorType;
3463 case AttributedType::attr_objc_gc:
3464 return AttributeList::AT_ObjCGC;
3465 case AttributedType::attr_objc_ownership:
3466 return AttributeList::AT_ObjCOwnership;
3467 case AttributedType::attr_noreturn:
3468 return AttributeList::AT_NoReturn;
3469 case AttributedType::attr_cdecl:
3470 return AttributeList::AT_CDecl;
3471 case AttributedType::attr_fastcall:
3472 return AttributeList::AT_FastCall;
3473 case AttributedType::attr_stdcall:
3474 return AttributeList::AT_StdCall;
3475 case AttributedType::attr_thiscall:
3476 return AttributeList::AT_ThisCall;
3477 case AttributedType::attr_pascal:
3478 return AttributeList::AT_Pascal;
3479 case AttributedType::attr_vectorcall:
3480 return AttributeList::AT_VectorCall;
3481 case AttributedType::attr_pcs:
3482 case AttributedType::attr_pcs_vfp:
3483 return AttributeList::AT_Pcs;
3484 case AttributedType::attr_inteloclbicc:
3485 return AttributeList::AT_IntelOclBicc;
3486 case AttributedType::attr_ms_abi:
3487 return AttributeList::AT_MSABI;
3488 case AttributedType::attr_sysv_abi:
3489 return AttributeList::AT_SysVABI;
3490 case AttributedType::attr_ptr32:
3491 return AttributeList::AT_Ptr32;
3492 case AttributedType::attr_ptr64:
3493 return AttributeList::AT_Ptr64;
3494 case AttributedType::attr_sptr:
3495 return AttributeList::AT_SPtr;
3496 case AttributedType::attr_uptr:
3497 return AttributeList::AT_UPtr;
3499 llvm_unreachable("unexpected attribute kind!");
3502 static void fillAttributedTypeLoc(AttributedTypeLoc TL,
3503 const AttributeList *attrs,
3504 const AttributeList *DeclAttrs = nullptr) {
3505 // DeclAttrs and attrs cannot be both empty.
3506 assert((attrs || DeclAttrs) &&
3507 "no type attributes in the expected location!");
3509 AttributeList::Kind parsedKind = getAttrListKind(TL.getAttrKind());
3510 // Try to search for an attribute of matching kind in attrs list.
3511 while (attrs && attrs->getKind() != parsedKind)
3512 attrs = attrs->getNext();
3514 // No matching type attribute in attrs list found.
3515 // Try searching through C++11 attributes in the declarator attribute list.
3516 while (DeclAttrs && (!DeclAttrs->isCXX11Attribute() ||
3517 DeclAttrs->getKind() != parsedKind))
3518 DeclAttrs = DeclAttrs->getNext();
3522 assert(attrs && "no matching type attribute in expected location!");
3524 TL.setAttrNameLoc(attrs->getLoc());
3525 if (TL.hasAttrExprOperand()) {
3526 assert(attrs->isArgExpr(0) && "mismatched attribute operand kind");
3527 TL.setAttrExprOperand(attrs->getArgAsExpr(0));
3528 } else if (TL.hasAttrEnumOperand()) {
3529 assert((attrs->isArgIdent(0) || attrs->isArgExpr(0)) &&
3530 "unexpected attribute operand kind");
3531 if (attrs->isArgIdent(0))
3532 TL.setAttrEnumOperandLoc(attrs->getArgAsIdent(0)->Loc);
3534 TL.setAttrEnumOperandLoc(attrs->getArgAsExpr(0)->getExprLoc());
3537 // FIXME: preserve this information to here.
3538 if (TL.hasAttrOperand())
3539 TL.setAttrOperandParensRange(SourceRange());
3543 class TypeSpecLocFiller : public TypeLocVisitor<TypeSpecLocFiller> {
3544 ASTContext &Context;
3548 TypeSpecLocFiller(ASTContext &Context, const DeclSpec &DS)
3549 : Context(Context), DS(DS) {}
3551 void VisitAttributedTypeLoc(AttributedTypeLoc TL) {
3552 fillAttributedTypeLoc(TL, DS.getAttributes().getList());
3553 Visit(TL.getModifiedLoc());
3555 void VisitQualifiedTypeLoc(QualifiedTypeLoc TL) {
3556 Visit(TL.getUnqualifiedLoc());
3558 void VisitTypedefTypeLoc(TypedefTypeLoc TL) {
3559 TL.setNameLoc(DS.getTypeSpecTypeLoc());
3561 void VisitObjCInterfaceTypeLoc(ObjCInterfaceTypeLoc TL) {
3562 TL.setNameLoc(DS.getTypeSpecTypeLoc());
3563 // FIXME. We should have DS.getTypeSpecTypeEndLoc(). But, it requires
3564 // addition field. What we have is good enough for dispay of location
3565 // of 'fixit' on interface name.
3566 TL.setNameEndLoc(DS.getLocEnd());
3568 void VisitObjCObjectTypeLoc(ObjCObjectTypeLoc TL) {
3569 // Handle the base type, which might not have been written explicitly.
3570 if (DS.getTypeSpecType() == DeclSpec::TST_unspecified) {
3571 TL.setHasBaseTypeAsWritten(false);
3572 TL.getBaseLoc().initialize(Context, SourceLocation());
3574 TL.setHasBaseTypeAsWritten(true);
3575 Visit(TL.getBaseLoc());
3578 // Protocol qualifiers.
3579 if (DS.getProtocolQualifiers()) {
3580 assert(TL.getNumProtocols() > 0);
3581 assert(TL.getNumProtocols() == DS.getNumProtocolQualifiers());
3582 TL.setLAngleLoc(DS.getProtocolLAngleLoc());
3583 TL.setRAngleLoc(DS.getSourceRange().getEnd());
3584 for (unsigned i = 0, e = DS.getNumProtocolQualifiers(); i != e; ++i)
3585 TL.setProtocolLoc(i, DS.getProtocolLocs()[i]);
3587 assert(TL.getNumProtocols() == 0);
3588 TL.setLAngleLoc(SourceLocation());
3589 TL.setRAngleLoc(SourceLocation());
3592 void VisitObjCObjectPointerTypeLoc(ObjCObjectPointerTypeLoc TL) {
3593 TL.setStarLoc(SourceLocation());
3594 Visit(TL.getPointeeLoc());
3596 void VisitTemplateSpecializationTypeLoc(TemplateSpecializationTypeLoc TL) {
3597 TypeSourceInfo *TInfo = nullptr;
3598 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo);
3600 // If we got no declarator info from previous Sema routines,
3601 // just fill with the typespec loc.
3603 TL.initialize(Context, DS.getTypeSpecTypeNameLoc());
3607 TypeLoc OldTL = TInfo->getTypeLoc();
3608 if (TInfo->getType()->getAs<ElaboratedType>()) {
3609 ElaboratedTypeLoc ElabTL = OldTL.castAs<ElaboratedTypeLoc>();
3610 TemplateSpecializationTypeLoc NamedTL = ElabTL.getNamedTypeLoc()
3611 .castAs<TemplateSpecializationTypeLoc>();
3614 TL.copy(OldTL.castAs<TemplateSpecializationTypeLoc>());
3615 assert(TL.getRAngleLoc() == OldTL.castAs<TemplateSpecializationTypeLoc>().getRAngleLoc());
3619 void VisitTypeOfExprTypeLoc(TypeOfExprTypeLoc TL) {
3620 assert(DS.getTypeSpecType() == DeclSpec::TST_typeofExpr);
3621 TL.setTypeofLoc(DS.getTypeSpecTypeLoc());
3622 TL.setParensRange(DS.getTypeofParensRange());
3624 void VisitTypeOfTypeLoc(TypeOfTypeLoc TL) {
3625 assert(DS.getTypeSpecType() == DeclSpec::TST_typeofType);
3626 TL.setTypeofLoc(DS.getTypeSpecTypeLoc());
3627 TL.setParensRange(DS.getTypeofParensRange());
3628 assert(DS.getRepAsType());
3629 TypeSourceInfo *TInfo = nullptr;
3630 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo);
3631 TL.setUnderlyingTInfo(TInfo);
3633 void VisitUnaryTransformTypeLoc(UnaryTransformTypeLoc TL) {
3634 // FIXME: This holds only because we only have one unary transform.
3635 assert(DS.getTypeSpecType() == DeclSpec::TST_underlyingType);
3636 TL.setKWLoc(DS.getTypeSpecTypeLoc());
3637 TL.setParensRange(DS.getTypeofParensRange());
3638 assert(DS.getRepAsType());
3639 TypeSourceInfo *TInfo = nullptr;
3640 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo);
3641 TL.setUnderlyingTInfo(TInfo);
3643 void VisitBuiltinTypeLoc(BuiltinTypeLoc TL) {
3644 // By default, use the source location of the type specifier.
3645 TL.setBuiltinLoc(DS.getTypeSpecTypeLoc());
3646 if (TL.needsExtraLocalData()) {
3647 // Set info for the written builtin specifiers.
3648 TL.getWrittenBuiltinSpecs() = DS.getWrittenBuiltinSpecs();
3649 // Try to have a meaningful source location.
3650 if (TL.getWrittenSignSpec() != TSS_unspecified)
3651 // Sign spec loc overrides the others (e.g., 'unsigned long').
3652 TL.setBuiltinLoc(DS.getTypeSpecSignLoc());
3653 else if (TL.getWrittenWidthSpec() != TSW_unspecified)
3654 // Width spec loc overrides type spec loc (e.g., 'short int').
3655 TL.setBuiltinLoc(DS.getTypeSpecWidthLoc());
3658 void VisitElaboratedTypeLoc(ElaboratedTypeLoc TL) {
3659 ElaboratedTypeKeyword Keyword
3660 = TypeWithKeyword::getKeywordForTypeSpec(DS.getTypeSpecType());
3661 if (DS.getTypeSpecType() == TST_typename) {
3662 TypeSourceInfo *TInfo = nullptr;
3663 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo);
3665 TL.copy(TInfo->getTypeLoc().castAs<ElaboratedTypeLoc>());
3669 TL.setElaboratedKeywordLoc(Keyword != ETK_None
3670 ? DS.getTypeSpecTypeLoc()
3671 : SourceLocation());
3672 const CXXScopeSpec& SS = DS.getTypeSpecScope();
3673 TL.setQualifierLoc(SS.getWithLocInContext(Context));
3674 Visit(TL.getNextTypeLoc().getUnqualifiedLoc());
3676 void VisitDependentNameTypeLoc(DependentNameTypeLoc TL) {
3677 assert(DS.getTypeSpecType() == TST_typename);
3678 TypeSourceInfo *TInfo = nullptr;
3679 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo);
3681 TL.copy(TInfo->getTypeLoc().castAs<DependentNameTypeLoc>());
3683 void VisitDependentTemplateSpecializationTypeLoc(
3684 DependentTemplateSpecializationTypeLoc TL) {
3685 assert(DS.getTypeSpecType() == TST_typename);
3686 TypeSourceInfo *TInfo = nullptr;
3687 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo);
3690 TInfo->getTypeLoc().castAs<DependentTemplateSpecializationTypeLoc>());
3692 void VisitTagTypeLoc(TagTypeLoc TL) {
3693 TL.setNameLoc(DS.getTypeSpecTypeNameLoc());
3695 void VisitAtomicTypeLoc(AtomicTypeLoc TL) {
3696 // An AtomicTypeLoc can come from either an _Atomic(...) type specifier
3697 // or an _Atomic qualifier.
3698 if (DS.getTypeSpecType() == DeclSpec::TST_atomic) {
3699 TL.setKWLoc(DS.getTypeSpecTypeLoc());
3700 TL.setParensRange(DS.getTypeofParensRange());
3702 TypeSourceInfo *TInfo = nullptr;
3703 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo);
3705 TL.getValueLoc().initializeFullCopy(TInfo->getTypeLoc());
3707 TL.setKWLoc(DS.getAtomicSpecLoc());
3708 // No parens, to indicate this was spelled as an _Atomic qualifier.
3709 TL.setParensRange(SourceRange());
3710 Visit(TL.getValueLoc());
3714 void VisitTypeLoc(TypeLoc TL) {
3715 // FIXME: add other typespec types and change this to an assert.
3716 TL.initialize(Context, DS.getTypeSpecTypeLoc());
3720 class DeclaratorLocFiller : public TypeLocVisitor<DeclaratorLocFiller> {
3721 ASTContext &Context;
3722 const DeclaratorChunk &Chunk;
3725 DeclaratorLocFiller(ASTContext &Context, const DeclaratorChunk &Chunk)
3726 : Context(Context), Chunk(Chunk) {}
3728 void VisitQualifiedTypeLoc(QualifiedTypeLoc TL) {
3729 llvm_unreachable("qualified type locs not expected here!");
3731 void VisitDecayedTypeLoc(DecayedTypeLoc TL) {
3732 llvm_unreachable("decayed type locs not expected here!");
3735 void VisitAttributedTypeLoc(AttributedTypeLoc TL) {
3736 fillAttributedTypeLoc(TL, Chunk.getAttrs());
3738 void VisitAdjustedTypeLoc(AdjustedTypeLoc TL) {
3741 void VisitBlockPointerTypeLoc(BlockPointerTypeLoc TL) {
3742 assert(Chunk.Kind == DeclaratorChunk::BlockPointer);
3743 TL.setCaretLoc(Chunk.Loc);
3745 void VisitPointerTypeLoc(PointerTypeLoc TL) {
3746 assert(Chunk.Kind == DeclaratorChunk::Pointer);
3747 TL.setStarLoc(Chunk.Loc);
3749 void VisitObjCObjectPointerTypeLoc(ObjCObjectPointerTypeLoc TL) {
3750 assert(Chunk.Kind == DeclaratorChunk::Pointer);
3751 TL.setStarLoc(Chunk.Loc);
3753 void VisitMemberPointerTypeLoc(MemberPointerTypeLoc TL) {
3754 assert(Chunk.Kind == DeclaratorChunk::MemberPointer);
3755 const CXXScopeSpec& SS = Chunk.Mem.Scope();
3756 NestedNameSpecifierLoc NNSLoc = SS.getWithLocInContext(Context);
3758 const Type* ClsTy = TL.getClass();
3759 QualType ClsQT = QualType(ClsTy, 0);
3760 TypeSourceInfo *ClsTInfo = Context.CreateTypeSourceInfo(ClsQT, 0);
3761 // Now copy source location info into the type loc component.
3762 TypeLoc ClsTL = ClsTInfo->getTypeLoc();
3763 switch (NNSLoc.getNestedNameSpecifier()->getKind()) {
3764 case NestedNameSpecifier::Identifier:
3765 assert(isa<DependentNameType>(ClsTy) && "Unexpected TypeLoc");
3767 DependentNameTypeLoc DNTLoc = ClsTL.castAs<DependentNameTypeLoc>();
3768 DNTLoc.setElaboratedKeywordLoc(SourceLocation());
3769 DNTLoc.setQualifierLoc(NNSLoc.getPrefix());
3770 DNTLoc.setNameLoc(NNSLoc.getLocalBeginLoc());
3774 case NestedNameSpecifier::TypeSpec:
3775 case NestedNameSpecifier::TypeSpecWithTemplate:
3776 if (isa<ElaboratedType>(ClsTy)) {
3777 ElaboratedTypeLoc ETLoc = ClsTL.castAs<ElaboratedTypeLoc>();
3778 ETLoc.setElaboratedKeywordLoc(SourceLocation());
3779 ETLoc.setQualifierLoc(NNSLoc.getPrefix());
3780 TypeLoc NamedTL = ETLoc.getNamedTypeLoc();
3781 NamedTL.initializeFullCopy(NNSLoc.getTypeLoc());
3783 ClsTL.initializeFullCopy(NNSLoc.getTypeLoc());
3787 case NestedNameSpecifier::Namespace:
3788 case NestedNameSpecifier::NamespaceAlias:
3789 case NestedNameSpecifier::Global:
3790 case NestedNameSpecifier::Super:
3791 llvm_unreachable("Nested-name-specifier must name a type");
3794 // Finally fill in MemberPointerLocInfo fields.
3795 TL.setStarLoc(Chunk.Loc);
3796 TL.setClassTInfo(ClsTInfo);
3798 void VisitLValueReferenceTypeLoc(LValueReferenceTypeLoc TL) {
3799 assert(Chunk.Kind == DeclaratorChunk::Reference);
3800 // 'Amp' is misleading: this might have been originally
3801 /// spelled with AmpAmp.
3802 TL.setAmpLoc(Chunk.Loc);
3804 void VisitRValueReferenceTypeLoc(RValueReferenceTypeLoc TL) {
3805 assert(Chunk.Kind == DeclaratorChunk::Reference);
3806 assert(!Chunk.Ref.LValueRef);
3807 TL.setAmpAmpLoc(Chunk.Loc);
3809 void VisitArrayTypeLoc(ArrayTypeLoc TL) {
3810 assert(Chunk.Kind == DeclaratorChunk::Array);
3811 TL.setLBracketLoc(Chunk.Loc);
3812 TL.setRBracketLoc(Chunk.EndLoc);
3813 TL.setSizeExpr(static_cast<Expr*>(Chunk.Arr.NumElts));
3815 void VisitFunctionTypeLoc(FunctionTypeLoc TL) {
3816 assert(Chunk.Kind == DeclaratorChunk::Function);
3817 TL.setLocalRangeBegin(Chunk.Loc);
3818 TL.setLocalRangeEnd(Chunk.EndLoc);
3820 const DeclaratorChunk::FunctionTypeInfo &FTI = Chunk.Fun;
3821 TL.setLParenLoc(FTI.getLParenLoc());
3822 TL.setRParenLoc(FTI.getRParenLoc());
3823 for (unsigned i = 0, e = TL.getNumParams(), tpi = 0; i != e; ++i) {
3824 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.Params[i].Param);
3825 TL.setParam(tpi++, Param);
3827 // FIXME: exception specs
3829 void VisitParenTypeLoc(ParenTypeLoc TL) {
3830 assert(Chunk.Kind == DeclaratorChunk::Paren);
3831 TL.setLParenLoc(Chunk.Loc);
3832 TL.setRParenLoc(Chunk.EndLoc);
3835 void VisitTypeLoc(TypeLoc TL) {
3836 llvm_unreachable("unsupported TypeLoc kind in declarator!");
3841 static void fillAtomicQualLoc(AtomicTypeLoc ATL, const DeclaratorChunk &Chunk) {
3843 switch (Chunk.Kind) {
3844 case DeclaratorChunk::Function:
3845 case DeclaratorChunk::Array:
3846 case DeclaratorChunk::Paren:
3847 llvm_unreachable("cannot be _Atomic qualified");
3849 case DeclaratorChunk::Pointer:
3850 Loc = SourceLocation::getFromRawEncoding(Chunk.Ptr.AtomicQualLoc);
3853 case DeclaratorChunk::BlockPointer:
3854 case DeclaratorChunk::Reference:
3855 case DeclaratorChunk::MemberPointer:
3856 // FIXME: Provide a source location for the _Atomic keyword.
3861 ATL.setParensRange(SourceRange());
3864 /// \brief Create and instantiate a TypeSourceInfo with type source information.
3866 /// \param T QualType referring to the type as written in source code.
3868 /// \param ReturnTypeInfo For declarators whose return type does not show
3869 /// up in the normal place in the declaration specifiers (such as a C++
3870 /// conversion function), this pointer will refer to a type source information
3871 /// for that return type.
3873 Sema::GetTypeSourceInfoForDeclarator(Declarator &D, QualType T,
3874 TypeSourceInfo *ReturnTypeInfo) {
3875 TypeSourceInfo *TInfo = Context.CreateTypeSourceInfo(T);
3876 UnqualTypeLoc CurrTL = TInfo->getTypeLoc().getUnqualifiedLoc();
3877 const AttributeList *DeclAttrs = D.getAttributes();
3879 // Handle parameter packs whose type is a pack expansion.
3880 if (isa<PackExpansionType>(T)) {
3881 CurrTL.castAs<PackExpansionTypeLoc>().setEllipsisLoc(D.getEllipsisLoc());
3882 CurrTL = CurrTL.getNextTypeLoc().getUnqualifiedLoc();
3885 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) {
3886 // An AtomicTypeLoc might be produced by an atomic qualifier in this
3887 // declarator chunk.
3888 if (AtomicTypeLoc ATL = CurrTL.getAs<AtomicTypeLoc>()) {
3889 fillAtomicQualLoc(ATL, D.getTypeObject(i));
3890 CurrTL = ATL.getValueLoc().getUnqualifiedLoc();
3893 while (AttributedTypeLoc TL = CurrTL.getAs<AttributedTypeLoc>()) {
3894 fillAttributedTypeLoc(TL, D.getTypeObject(i).getAttrs(), DeclAttrs);
3895 CurrTL = TL.getNextTypeLoc().getUnqualifiedLoc();
3898 // FIXME: Ordering here?
3899 while (AdjustedTypeLoc TL = CurrTL.getAs<AdjustedTypeLoc>())
3900 CurrTL = TL.getNextTypeLoc().getUnqualifiedLoc();
3902 DeclaratorLocFiller(Context, D.getTypeObject(i)).Visit(CurrTL);
3903 CurrTL = CurrTL.getNextTypeLoc().getUnqualifiedLoc();
3906 // If we have different source information for the return type, use
3907 // that. This really only applies to C++ conversion functions.
3908 if (ReturnTypeInfo) {
3909 TypeLoc TL = ReturnTypeInfo->getTypeLoc();
3910 assert(TL.getFullDataSize() == CurrTL.getFullDataSize());
3911 memcpy(CurrTL.getOpaqueData(), TL.getOpaqueData(), TL.getFullDataSize());
3913 TypeSpecLocFiller(Context, D.getDeclSpec()).Visit(CurrTL);
3919 /// \brief Create a LocInfoType to hold the given QualType and TypeSourceInfo.
3920 ParsedType Sema::CreateParsedType(QualType T, TypeSourceInfo *TInfo) {
3921 // FIXME: LocInfoTypes are "transient", only needed for passing to/from Parser
3922 // and Sema during declaration parsing. Try deallocating/caching them when
3923 // it's appropriate, instead of allocating them and keeping them around.
3924 LocInfoType *LocT = (LocInfoType*)BumpAlloc.Allocate(sizeof(LocInfoType),
3926 new (LocT) LocInfoType(T, TInfo);
3927 assert(LocT->getTypeClass() != T->getTypeClass() &&
3928 "LocInfoType's TypeClass conflicts with an existing Type class");
3929 return ParsedType::make(QualType(LocT, 0));
3932 void LocInfoType::getAsStringInternal(std::string &Str,
3933 const PrintingPolicy &Policy) const {
3934 llvm_unreachable("LocInfoType leaked into the type system; an opaque TypeTy*"
3935 " was used directly instead of getting the QualType through"
3936 " GetTypeFromParser");
3939 TypeResult Sema::ActOnTypeName(Scope *S, Declarator &D) {
3940 // C99 6.7.6: Type names have no identifier. This is already validated by
3942 assert(D.getIdentifier() == nullptr &&
3943 "Type name should have no identifier!");
3945 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S);
3946 QualType T = TInfo->getType();
3947 if (D.isInvalidType())
3950 // Make sure there are no unused decl attributes on the declarator.
3951 // We don't want to do this for ObjC parameters because we're going
3952 // to apply them to the actual parameter declaration.
3953 // Likewise, we don't want to do this for alias declarations, because
3954 // we are actually going to build a declaration from this eventually.
3955 if (D.getContext() != Declarator::ObjCParameterContext &&
3956 D.getContext() != Declarator::AliasDeclContext &&
3957 D.getContext() != Declarator::AliasTemplateContext)
3958 checkUnusedDeclAttributes(D);
3960 if (getLangOpts().CPlusPlus) {
3961 // Check that there are no default arguments (C++ only).
3962 CheckExtraCXXDefaultArguments(D);
3965 return CreateParsedType(T, TInfo);
3968 ParsedType Sema::ActOnObjCInstanceType(SourceLocation Loc) {
3969 QualType T = Context.getObjCInstanceType();
3970 TypeSourceInfo *TInfo = Context.getTrivialTypeSourceInfo(T, Loc);
3971 return CreateParsedType(T, TInfo);
3975 //===----------------------------------------------------------------------===//
3976 // Type Attribute Processing
3977 //===----------------------------------------------------------------------===//
3979 /// HandleAddressSpaceTypeAttribute - Process an address_space attribute on the
3980 /// specified type. The attribute contains 1 argument, the id of the address
3981 /// space for the type.
3982 static void HandleAddressSpaceTypeAttribute(QualType &Type,
3983 const AttributeList &Attr, Sema &S){
3985 // If this type is already address space qualified, reject it.
3986 // ISO/IEC TR 18037 S5.3 (amending C99 6.7.3): "No type shall be qualified by
3987 // qualifiers for two or more different address spaces."
3988 if (Type.getAddressSpace()) {
3989 S.Diag(Attr.getLoc(), diag::err_attribute_address_multiple_qualifiers);
3994 // ISO/IEC TR 18037 S5.3 (amending C99 6.7.3): "A function type shall not be
3995 // qualified by an address-space qualifier."
3996 if (Type->isFunctionType()) {
3997 S.Diag(Attr.getLoc(), diag::err_attribute_address_function_type);
4003 if (Attr.getKind() == AttributeList::AT_AddressSpace) {
4004 // Check the attribute arguments.
4005 if (Attr.getNumArgs() != 1) {
4006 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments)
4007 << Attr.getName() << 1;
4011 Expr *ASArgExpr = static_cast<Expr *>(Attr.getArgAsExpr(0));
4012 llvm::APSInt addrSpace(32);
4013 if (ASArgExpr->isTypeDependent() || ASArgExpr->isValueDependent() ||
4014 !ASArgExpr->isIntegerConstantExpr(addrSpace, S.Context)) {
4015 S.Diag(Attr.getLoc(), diag::err_attribute_argument_type)
4016 << Attr.getName() << AANT_ArgumentIntegerConstant
4017 << ASArgExpr->getSourceRange();
4023 if (addrSpace.isSigned()) {
4024 if (addrSpace.isNegative()) {
4025 S.Diag(Attr.getLoc(), diag::err_attribute_address_space_negative)
4026 << ASArgExpr->getSourceRange();
4030 addrSpace.setIsSigned(false);
4032 llvm::APSInt max(addrSpace.getBitWidth());
4033 max = Qualifiers::MaxAddressSpace;
4034 if (addrSpace > max) {
4035 S.Diag(Attr.getLoc(), diag::err_attribute_address_space_too_high)
4036 << int(Qualifiers::MaxAddressSpace) << ASArgExpr->getSourceRange();
4040 ASIdx = static_cast<unsigned>(addrSpace.getZExtValue());
4042 // The keyword-based type attributes imply which address space to use.
4043 switch (Attr.getKind()) {
4044 case AttributeList::AT_OpenCLGlobalAddressSpace:
4045 ASIdx = LangAS::opencl_global; break;
4046 case AttributeList::AT_OpenCLLocalAddressSpace:
4047 ASIdx = LangAS::opencl_local; break;
4048 case AttributeList::AT_OpenCLConstantAddressSpace:
4049 ASIdx = LangAS::opencl_constant; break;
4050 case AttributeList::AT_OpenCLGenericAddressSpace:
4051 ASIdx = LangAS::opencl_generic; break;
4053 assert(Attr.getKind() == AttributeList::AT_OpenCLPrivateAddressSpace);
4058 Type = S.Context.getAddrSpaceQualType(Type, ASIdx);
4061 /// Does this type have a "direct" ownership qualifier? That is,
4062 /// is it written like "__strong id", as opposed to something like
4063 /// "typeof(foo)", where that happens to be strong?
4064 static bool hasDirectOwnershipQualifier(QualType type) {
4065 // Fast path: no qualifier at all.
4066 assert(type.getQualifiers().hasObjCLifetime());
4070 if (const AttributedType *attr = dyn_cast<AttributedType>(type)) {
4071 if (attr->getAttrKind() == AttributedType::attr_objc_ownership)
4074 type = attr->getModifiedType();
4076 // X *__strong (...)
4077 } else if (const ParenType *paren = dyn_cast<ParenType>(type)) {
4078 type = paren->getInnerType();
4080 // That's it for things we want to complain about. In particular,
4081 // we do not want to look through typedefs, typeof(expr),
4082 // typeof(type), or any other way that the type is somehow
4091 /// handleObjCOwnershipTypeAttr - Process an objc_ownership
4092 /// attribute on the specified type.
4094 /// Returns 'true' if the attribute was handled.
4095 static bool handleObjCOwnershipTypeAttr(TypeProcessingState &state,
4096 AttributeList &attr,
4098 bool NonObjCPointer = false;
4100 if (!type->isDependentType() && !type->isUndeducedType()) {
4101 if (const PointerType *ptr = type->getAs<PointerType>()) {
4102 QualType pointee = ptr->getPointeeType();
4103 if (pointee->isObjCRetainableType() || pointee->isPointerType())
4105 // It is important not to lose the source info that there was an attribute
4106 // applied to non-objc pointer. We will create an attributed type but
4107 // its type will be the same as the original type.
4108 NonObjCPointer = true;
4109 } else if (!type->isObjCRetainableType()) {
4113 // Don't accept an ownership attribute in the declspec if it would
4114 // just be the return type of a block pointer.
4115 if (state.isProcessingDeclSpec()) {
4116 Declarator &D = state.getDeclarator();
4117 if (maybeMovePastReturnType(D, D.getNumTypeObjects()))
4122 Sema &S = state.getSema();
4123 SourceLocation AttrLoc = attr.getLoc();
4124 if (AttrLoc.isMacroID())
4125 AttrLoc = S.getSourceManager().getImmediateExpansionRange(AttrLoc).first;
4127 if (!attr.isArgIdent(0)) {
4128 S.Diag(AttrLoc, diag::err_attribute_argument_type)
4129 << attr.getName() << AANT_ArgumentString;
4134 // Consume lifetime attributes without further comment outside of
4136 if (!S.getLangOpts().ObjCAutoRefCount)
4139 IdentifierInfo *II = attr.getArgAsIdent(0)->Ident;
4140 Qualifiers::ObjCLifetime lifetime;
4141 if (II->isStr("none"))
4142 lifetime = Qualifiers::OCL_ExplicitNone;
4143 else if (II->isStr("strong"))
4144 lifetime = Qualifiers::OCL_Strong;
4145 else if (II->isStr("weak"))
4146 lifetime = Qualifiers::OCL_Weak;
4147 else if (II->isStr("autoreleasing"))
4148 lifetime = Qualifiers::OCL_Autoreleasing;
4150 S.Diag(AttrLoc, diag::warn_attribute_type_not_supported)
4151 << attr.getName() << II;
4156 SplitQualType underlyingType = type.split();
4158 // Check for redundant/conflicting ownership qualifiers.
4159 if (Qualifiers::ObjCLifetime previousLifetime
4160 = type.getQualifiers().getObjCLifetime()) {
4161 // If it's written directly, that's an error.
4162 if (hasDirectOwnershipQualifier(type)) {
4163 S.Diag(AttrLoc, diag::err_attr_objc_ownership_redundant)
4168 // Otherwise, if the qualifiers actually conflict, pull sugar off
4169 // until we reach a type that is directly qualified.
4170 if (previousLifetime != lifetime) {
4171 // This should always terminate: the canonical type is
4172 // qualified, so some bit of sugar must be hiding it.
4173 while (!underlyingType.Quals.hasObjCLifetime()) {
4174 underlyingType = underlyingType.getSingleStepDesugaredType();
4176 underlyingType.Quals.removeObjCLifetime();
4180 underlyingType.Quals.addObjCLifetime(lifetime);
4182 if (NonObjCPointer) {
4183 StringRef name = attr.getName()->getName();
4185 case Qualifiers::OCL_None:
4186 case Qualifiers::OCL_ExplicitNone:
4188 case Qualifiers::OCL_Strong: name = "__strong"; break;
4189 case Qualifiers::OCL_Weak: name = "__weak"; break;
4190 case Qualifiers::OCL_Autoreleasing: name = "__autoreleasing"; break;
4192 S.Diag(AttrLoc, diag::warn_type_attribute_wrong_type) << name
4193 << TDS_ObjCObjOrBlock << type;
4196 QualType origType = type;
4197 if (!NonObjCPointer)
4198 type = S.Context.getQualifiedType(underlyingType);
4200 // If we have a valid source location for the attribute, use an
4201 // AttributedType instead.
4202 if (AttrLoc.isValid())
4203 type = S.Context.getAttributedType(AttributedType::attr_objc_ownership,
4206 // Forbid __weak if the runtime doesn't support it.
4207 if (lifetime == Qualifiers::OCL_Weak &&
4208 !S.getLangOpts().ObjCARCWeak && !NonObjCPointer) {
4210 // Actually, delay this until we know what we're parsing.
4211 if (S.DelayedDiagnostics.shouldDelayDiagnostics()) {
4212 S.DelayedDiagnostics.add(
4213 sema::DelayedDiagnostic::makeForbiddenType(
4214 S.getSourceManager().getExpansionLoc(AttrLoc),
4215 diag::err_arc_weak_no_runtime, type, /*ignored*/ 0));
4217 S.Diag(AttrLoc, diag::err_arc_weak_no_runtime);
4224 // Forbid __weak for class objects marked as
4225 // objc_arc_weak_reference_unavailable
4226 if (lifetime == Qualifiers::OCL_Weak) {
4227 if (const ObjCObjectPointerType *ObjT =
4228 type->getAs<ObjCObjectPointerType>()) {
4229 if (ObjCInterfaceDecl *Class = ObjT->getInterfaceDecl()) {
4230 if (Class->isArcWeakrefUnavailable()) {
4231 S.Diag(AttrLoc, diag::err_arc_unsupported_weak_class);
4232 S.Diag(ObjT->getInterfaceDecl()->getLocation(),
4233 diag::note_class_declared);
4242 /// handleObjCGCTypeAttr - Process the __attribute__((objc_gc)) type
4243 /// attribute on the specified type. Returns true to indicate that
4244 /// the attribute was handled, false to indicate that the type does
4245 /// not permit the attribute.
4246 static bool handleObjCGCTypeAttr(TypeProcessingState &state,
4247 AttributeList &attr,
4249 Sema &S = state.getSema();
4251 // Delay if this isn't some kind of pointer.
4252 if (!type->isPointerType() &&
4253 !type->isObjCObjectPointerType() &&
4254 !type->isBlockPointerType())
4257 if (type.getObjCGCAttr() != Qualifiers::GCNone) {
4258 S.Diag(attr.getLoc(), diag::err_attribute_multiple_objc_gc);
4263 // Check the attribute arguments.
4264 if (!attr.isArgIdent(0)) {
4265 S.Diag(attr.getLoc(), diag::err_attribute_argument_type)
4266 << attr.getName() << AANT_ArgumentString;
4270 Qualifiers::GC GCAttr;
4271 if (attr.getNumArgs() > 1) {
4272 S.Diag(attr.getLoc(), diag::err_attribute_wrong_number_arguments)
4273 << attr.getName() << 1;
4278 IdentifierInfo *II = attr.getArgAsIdent(0)->Ident;
4279 if (II->isStr("weak"))
4280 GCAttr = Qualifiers::Weak;
4281 else if (II->isStr("strong"))
4282 GCAttr = Qualifiers::Strong;
4284 S.Diag(attr.getLoc(), diag::warn_attribute_type_not_supported)
4285 << attr.getName() << II;
4290 QualType origType = type;
4291 type = S.Context.getObjCGCQualType(origType, GCAttr);
4293 // Make an attributed type to preserve the source information.
4294 if (attr.getLoc().isValid())
4295 type = S.Context.getAttributedType(AttributedType::attr_objc_gc,
4302 /// A helper class to unwrap a type down to a function for the
4303 /// purposes of applying attributes there.
4306 /// FunctionTypeUnwrapper unwrapped(SemaRef, T);
4307 /// if (unwrapped.isFunctionType()) {
4308 /// const FunctionType *fn = unwrapped.get();
4309 /// // change fn somehow
4310 /// T = unwrapped.wrap(fn);
4312 struct FunctionTypeUnwrapper {
4323 const FunctionType *Fn;
4324 SmallVector<unsigned char /*WrapKind*/, 8> Stack;
4326 FunctionTypeUnwrapper(Sema &S, QualType T) : Original(T) {
4328 const Type *Ty = T.getTypePtr();
4329 if (isa<FunctionType>(Ty)) {
4330 Fn = cast<FunctionType>(Ty);
4332 } else if (isa<ParenType>(Ty)) {
4333 T = cast<ParenType>(Ty)->getInnerType();
4334 Stack.push_back(Parens);
4335 } else if (isa<PointerType>(Ty)) {
4336 T = cast<PointerType>(Ty)->getPointeeType();
4337 Stack.push_back(Pointer);
4338 } else if (isa<BlockPointerType>(Ty)) {
4339 T = cast<BlockPointerType>(Ty)->getPointeeType();
4340 Stack.push_back(BlockPointer);
4341 } else if (isa<MemberPointerType>(Ty)) {
4342 T = cast<MemberPointerType>(Ty)->getPointeeType();
4343 Stack.push_back(MemberPointer);
4344 } else if (isa<ReferenceType>(Ty)) {
4345 T = cast<ReferenceType>(Ty)->getPointeeType();
4346 Stack.push_back(Reference);
4348 const Type *DTy = Ty->getUnqualifiedDesugaredType();
4354 T = QualType(DTy, 0);
4355 Stack.push_back(Desugar);
4360 bool isFunctionType() const { return (Fn != nullptr); }
4361 const FunctionType *get() const { return Fn; }
4363 QualType wrap(Sema &S, const FunctionType *New) {
4364 // If T wasn't modified from the unwrapped type, do nothing.
4365 if (New == get()) return Original;
4368 return wrap(S.Context, Original, 0);
4372 QualType wrap(ASTContext &C, QualType Old, unsigned I) {
4373 if (I == Stack.size())
4374 return C.getQualifiedType(Fn, Old.getQualifiers());
4376 // Build up the inner type, applying the qualifiers from the old
4377 // type to the new type.
4378 SplitQualType SplitOld = Old.split();
4380 // As a special case, tail-recurse if there are no qualifiers.
4381 if (SplitOld.Quals.empty())
4382 return wrap(C, SplitOld.Ty, I);
4383 return C.getQualifiedType(wrap(C, SplitOld.Ty, I), SplitOld.Quals);
4386 QualType wrap(ASTContext &C, const Type *Old, unsigned I) {
4387 if (I == Stack.size()) return QualType(Fn, 0);
4389 switch (static_cast<WrapKind>(Stack[I++])) {
4391 // This is the point at which we potentially lose source
4393 return wrap(C, Old->getUnqualifiedDesugaredType(), I);
4396 QualType New = wrap(C, cast<ParenType>(Old)->getInnerType(), I);
4397 return C.getParenType(New);
4401 QualType New = wrap(C, cast<PointerType>(Old)->getPointeeType(), I);
4402 return C.getPointerType(New);
4405 case BlockPointer: {
4406 QualType New = wrap(C, cast<BlockPointerType>(Old)->getPointeeType(),I);
4407 return C.getBlockPointerType(New);
4410 case MemberPointer: {
4411 const MemberPointerType *OldMPT = cast<MemberPointerType>(Old);
4412 QualType New = wrap(C, OldMPT->getPointeeType(), I);
4413 return C.getMemberPointerType(New, OldMPT->getClass());
4417 const ReferenceType *OldRef = cast<ReferenceType>(Old);
4418 QualType New = wrap(C, OldRef->getPointeeType(), I);
4419 if (isa<LValueReferenceType>(OldRef))
4420 return C.getLValueReferenceType(New, OldRef->isSpelledAsLValue());
4422 return C.getRValueReferenceType(New);
4426 llvm_unreachable("unknown wrapping kind");
4431 static bool handleMSPointerTypeQualifierAttr(TypeProcessingState &State,
4432 AttributeList &Attr,
4434 Sema &S = State.getSema();
4436 AttributeList::Kind Kind = Attr.getKind();
4437 QualType Desugared = Type;
4438 const AttributedType *AT = dyn_cast<AttributedType>(Type);
4440 AttributedType::Kind CurAttrKind = AT->getAttrKind();
4442 // You cannot specify duplicate type attributes, so if the attribute has
4443 // already been applied, flag it.
4444 if (getAttrListKind(CurAttrKind) == Kind) {
4445 S.Diag(Attr.getLoc(), diag::warn_duplicate_attribute_exact)
4450 // You cannot have both __sptr and __uptr on the same type, nor can you
4451 // have __ptr32 and __ptr64.
4452 if ((CurAttrKind == AttributedType::attr_ptr32 &&
4453 Kind == AttributeList::AT_Ptr64) ||
4454 (CurAttrKind == AttributedType::attr_ptr64 &&
4455 Kind == AttributeList::AT_Ptr32)) {
4456 S.Diag(Attr.getLoc(), diag::err_attributes_are_not_compatible)
4457 << "'__ptr32'" << "'__ptr64'";
4459 } else if ((CurAttrKind == AttributedType::attr_sptr &&
4460 Kind == AttributeList::AT_UPtr) ||
4461 (CurAttrKind == AttributedType::attr_uptr &&
4462 Kind == AttributeList::AT_SPtr)) {
4463 S.Diag(Attr.getLoc(), diag::err_attributes_are_not_compatible)
4464 << "'__sptr'" << "'__uptr'";
4468 Desugared = AT->getEquivalentType();
4469 AT = dyn_cast<AttributedType>(Desugared);
4472 // Pointer type qualifiers can only operate on pointer types, but not
4473 // pointer-to-member types.
4474 if (!isa<PointerType>(Desugared)) {
4475 S.Diag(Attr.getLoc(), Type->isMemberPointerType() ?
4476 diag::err_attribute_no_member_pointers :
4477 diag::err_attribute_pointers_only) << Attr.getName();
4481 AttributedType::Kind TAK;
4483 default: llvm_unreachable("Unknown attribute kind");
4484 case AttributeList::AT_Ptr32: TAK = AttributedType::attr_ptr32; break;
4485 case AttributeList::AT_Ptr64: TAK = AttributedType::attr_ptr64; break;
4486 case AttributeList::AT_SPtr: TAK = AttributedType::attr_sptr; break;
4487 case AttributeList::AT_UPtr: TAK = AttributedType::attr_uptr; break;
4490 Type = S.Context.getAttributedType(TAK, Type, Type);
4494 static AttributedType::Kind getCCTypeAttrKind(AttributeList &Attr) {
4495 assert(!Attr.isInvalid());
4496 switch (Attr.getKind()) {
4498 llvm_unreachable("not a calling convention attribute");
4499 case AttributeList::AT_CDecl:
4500 return AttributedType::attr_cdecl;
4501 case AttributeList::AT_FastCall:
4502 return AttributedType::attr_fastcall;
4503 case AttributeList::AT_StdCall:
4504 return AttributedType::attr_stdcall;
4505 case AttributeList::AT_ThisCall:
4506 return AttributedType::attr_thiscall;
4507 case AttributeList::AT_Pascal:
4508 return AttributedType::attr_pascal;
4509 case AttributeList::AT_VectorCall:
4510 return AttributedType::attr_vectorcall;
4511 case AttributeList::AT_Pcs: {
4512 // The attribute may have had a fixit applied where we treated an
4513 // identifier as a string literal. The contents of the string are valid,
4514 // but the form may not be.
4516 if (Attr.isArgExpr(0))
4517 Str = cast<StringLiteral>(Attr.getArgAsExpr(0))->getString();
4519 Str = Attr.getArgAsIdent(0)->Ident->getName();
4520 return llvm::StringSwitch<AttributedType::Kind>(Str)
4521 .Case("aapcs", AttributedType::attr_pcs)
4522 .Case("aapcs-vfp", AttributedType::attr_pcs_vfp);
4524 case AttributeList::AT_IntelOclBicc:
4525 return AttributedType::attr_inteloclbicc;
4526 case AttributeList::AT_MSABI:
4527 return AttributedType::attr_ms_abi;
4528 case AttributeList::AT_SysVABI:
4529 return AttributedType::attr_sysv_abi;
4531 llvm_unreachable("unexpected attribute kind!");
4534 /// Process an individual function attribute. Returns true to
4535 /// indicate that the attribute was handled, false if it wasn't.
4536 static bool handleFunctionTypeAttr(TypeProcessingState &state,
4537 AttributeList &attr,
4539 Sema &S = state.getSema();
4541 FunctionTypeUnwrapper unwrapped(S, type);
4543 if (attr.getKind() == AttributeList::AT_NoReturn) {
4544 if (S.CheckNoReturnAttr(attr))
4547 // Delay if this is not a function type.
4548 if (!unwrapped.isFunctionType())
4551 // Otherwise we can process right away.
4552 FunctionType::ExtInfo EI = unwrapped.get()->getExtInfo().withNoReturn(true);
4553 type = unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI));
4557 // ns_returns_retained is not always a type attribute, but if we got
4558 // here, we're treating it as one right now.
4559 if (attr.getKind() == AttributeList::AT_NSReturnsRetained) {
4560 assert(S.getLangOpts().ObjCAutoRefCount &&
4561 "ns_returns_retained treated as type attribute in non-ARC");
4562 if (attr.getNumArgs()) return true;
4564 // Delay if this is not a function type.
4565 if (!unwrapped.isFunctionType())
4568 FunctionType::ExtInfo EI
4569 = unwrapped.get()->getExtInfo().withProducesResult(true);
4570 type = unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI));
4574 if (attr.getKind() == AttributeList::AT_Regparm) {
4576 if (S.CheckRegparmAttr(attr, value))
4579 // Delay if this is not a function type.
4580 if (!unwrapped.isFunctionType())
4583 // Diagnose regparm with fastcall.
4584 const FunctionType *fn = unwrapped.get();
4585 CallingConv CC = fn->getCallConv();
4586 if (CC == CC_X86FastCall) {
4587 S.Diag(attr.getLoc(), diag::err_attributes_are_not_compatible)
4588 << FunctionType::getNameForCallConv(CC)
4594 FunctionType::ExtInfo EI =
4595 unwrapped.get()->getExtInfo().withRegParm(value);
4596 type = unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI));
4600 // Delay if the type didn't work out to a function.
4601 if (!unwrapped.isFunctionType()) return false;
4603 // Otherwise, a calling convention.
4605 if (S.CheckCallingConvAttr(attr, CC))
4608 const FunctionType *fn = unwrapped.get();
4609 CallingConv CCOld = fn->getCallConv();
4610 AttributedType::Kind CCAttrKind = getCCTypeAttrKind(attr);
4613 // Error out on when there's already an attribute on the type
4614 // and the CCs don't match.
4615 const AttributedType *AT = S.getCallingConvAttributedType(type);
4616 if (AT && AT->getAttrKind() != CCAttrKind) {
4617 S.Diag(attr.getLoc(), diag::err_attributes_are_not_compatible)
4618 << FunctionType::getNameForCallConv(CC)
4619 << FunctionType::getNameForCallConv(CCOld);
4625 // Diagnose use of callee-cleanup calling convention on variadic functions.
4626 if (!supportsVariadicCall(CC)) {
4627 const FunctionProtoType *FnP = dyn_cast<FunctionProtoType>(fn);
4628 if (FnP && FnP->isVariadic()) {
4629 unsigned DiagID = diag::err_cconv_varargs;
4630 // stdcall and fastcall are ignored with a warning for GCC and MS
4632 if (CC == CC_X86StdCall || CC == CC_X86FastCall)
4633 DiagID = diag::warn_cconv_varargs;
4635 S.Diag(attr.getLoc(), DiagID) << FunctionType::getNameForCallConv(CC);
4641 // Also diagnose fastcall with regparm.
4642 if (CC == CC_X86FastCall && fn->getHasRegParm()) {
4643 S.Diag(attr.getLoc(), diag::err_attributes_are_not_compatible)
4644 << "regparm" << FunctionType::getNameForCallConv(CC_X86FastCall);
4649 // Modify the CC from the wrapped function type, wrap it all back, and then
4650 // wrap the whole thing in an AttributedType as written. The modified type
4651 // might have a different CC if we ignored the attribute.
4652 FunctionType::ExtInfo EI = unwrapped.get()->getExtInfo().withCallingConv(CC);
4653 QualType Equivalent =
4654 unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI));
4655 type = S.Context.getAttributedType(CCAttrKind, type, Equivalent);
4659 bool Sema::hasExplicitCallingConv(QualType &T) {
4660 QualType R = T.IgnoreParens();
4661 while (const AttributedType *AT = dyn_cast<AttributedType>(R)) {
4662 if (AT->isCallingConv())
4664 R = AT->getModifiedType().IgnoreParens();
4669 void Sema::adjustMemberFunctionCC(QualType &T, bool IsStatic) {
4670 FunctionTypeUnwrapper Unwrapped(*this, T);
4671 const FunctionType *FT = Unwrapped.get();
4672 bool IsVariadic = (isa<FunctionProtoType>(FT) &&
4673 cast<FunctionProtoType>(FT)->isVariadic());
4675 // Only adjust types with the default convention. For example, on Windows we
4676 // should adjust a __cdecl type to __thiscall for instance methods, and a
4677 // __thiscall type to __cdecl for static methods.
4678 CallingConv CurCC = FT->getCallConv();
4679 CallingConv FromCC =
4680 Context.getDefaultCallingConvention(IsVariadic, IsStatic);
4681 CallingConv ToCC = Context.getDefaultCallingConvention(IsVariadic, !IsStatic);
4682 if (CurCC != FromCC || FromCC == ToCC)
4685 if (hasExplicitCallingConv(T))
4688 FT = Context.adjustFunctionType(FT, FT->getExtInfo().withCallingConv(ToCC));
4689 QualType Wrapped = Unwrapped.wrap(*this, FT);
4690 T = Context.getAdjustedType(T, Wrapped);
4693 /// HandleVectorSizeAttribute - this attribute is only applicable to integral
4694 /// and float scalars, although arrays, pointers, and function return values are
4695 /// allowed in conjunction with this construct. Aggregates with this attribute
4696 /// are invalid, even if they are of the same size as a corresponding scalar.
4697 /// The raw attribute should contain precisely 1 argument, the vector size for
4698 /// the variable, measured in bytes. If curType and rawAttr are well formed,
4699 /// this routine will return a new vector type.
4700 static void HandleVectorSizeAttr(QualType& CurType, const AttributeList &Attr,
4702 // Check the attribute arguments.
4703 if (Attr.getNumArgs() != 1) {
4704 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments)
4705 << Attr.getName() << 1;
4709 Expr *sizeExpr = static_cast<Expr *>(Attr.getArgAsExpr(0));
4710 llvm::APSInt vecSize(32);
4711 if (sizeExpr->isTypeDependent() || sizeExpr->isValueDependent() ||
4712 !sizeExpr->isIntegerConstantExpr(vecSize, S.Context)) {
4713 S.Diag(Attr.getLoc(), diag::err_attribute_argument_type)
4714 << Attr.getName() << AANT_ArgumentIntegerConstant
4715 << sizeExpr->getSourceRange();
4719 // The base type must be integer (not Boolean or enumeration) or float, and
4720 // can't already be a vector.
4721 if (!CurType->isBuiltinType() || CurType->isBooleanType() ||
4722 (!CurType->isIntegerType() && !CurType->isRealFloatingType())) {
4723 S.Diag(Attr.getLoc(), diag::err_attribute_invalid_vector_type) << CurType;
4727 unsigned typeSize = static_cast<unsigned>(S.Context.getTypeSize(CurType));
4728 // vecSize is specified in bytes - convert to bits.
4729 unsigned vectorSize = static_cast<unsigned>(vecSize.getZExtValue() * 8);
4731 // the vector size needs to be an integral multiple of the type size.
4732 if (vectorSize % typeSize) {
4733 S.Diag(Attr.getLoc(), diag::err_attribute_invalid_size)
4734 << sizeExpr->getSourceRange();
4738 if (VectorType::isVectorSizeTooLarge(vectorSize / typeSize)) {
4739 S.Diag(Attr.getLoc(), diag::err_attribute_size_too_large)
4740 << sizeExpr->getSourceRange();
4744 if (vectorSize == 0) {
4745 S.Diag(Attr.getLoc(), diag::err_attribute_zero_size)
4746 << sizeExpr->getSourceRange();
4751 // Success! Instantiate the vector type, the number of elements is > 0, and
4752 // not required to be a power of 2, unlike GCC.
4753 CurType = S.Context.getVectorType(CurType, vectorSize/typeSize,
4754 VectorType::GenericVector);
4757 /// \brief Process the OpenCL-like ext_vector_type attribute when it occurs on
4759 static void HandleExtVectorTypeAttr(QualType &CurType,
4760 const AttributeList &Attr,
4762 // check the attribute arguments.
4763 if (Attr.getNumArgs() != 1) {
4764 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments)
4765 << Attr.getName() << 1;
4771 // Special case where the argument is a template id.
4772 if (Attr.isArgIdent(0)) {
4774 SourceLocation TemplateKWLoc;
4776 id.setIdentifier(Attr.getArgAsIdent(0)->Ident, Attr.getLoc());
4778 ExprResult Size = S.ActOnIdExpression(S.getCurScope(), SS, TemplateKWLoc,
4780 if (Size.isInvalid())
4783 sizeExpr = Size.get();
4785 sizeExpr = Attr.getArgAsExpr(0);
4788 // Create the vector type.
4789 QualType T = S.BuildExtVectorType(CurType, sizeExpr, Attr.getLoc());
4794 static bool isPermittedNeonBaseType(QualType &Ty,
4795 VectorType::VectorKind VecKind, Sema &S) {
4796 const BuiltinType *BTy = Ty->getAs<BuiltinType>();
4800 llvm::Triple Triple = S.Context.getTargetInfo().getTriple();
4802 // Signed poly is mathematically wrong, but has been baked into some ABIs by
4804 bool IsPolyUnsigned = Triple.getArch() == llvm::Triple::aarch64 ||
4805 Triple.getArch() == llvm::Triple::aarch64_be;
4806 if (VecKind == VectorType::NeonPolyVector) {
4807 if (IsPolyUnsigned) {
4808 // AArch64 polynomial vectors are unsigned and support poly64.
4809 return BTy->getKind() == BuiltinType::UChar ||
4810 BTy->getKind() == BuiltinType::UShort ||
4811 BTy->getKind() == BuiltinType::ULong ||
4812 BTy->getKind() == BuiltinType::ULongLong;
4814 // AArch32 polynomial vector are signed.
4815 return BTy->getKind() == BuiltinType::SChar ||
4816 BTy->getKind() == BuiltinType::Short;
4820 // Non-polynomial vector types: the usual suspects are allowed, as well as
4821 // float64_t on AArch64.
4822 bool Is64Bit = Triple.getArch() == llvm::Triple::aarch64 ||
4823 Triple.getArch() == llvm::Triple::aarch64_be;
4825 if (Is64Bit && BTy->getKind() == BuiltinType::Double)
4828 return BTy->getKind() == BuiltinType::SChar ||
4829 BTy->getKind() == BuiltinType::UChar ||
4830 BTy->getKind() == BuiltinType::Short ||
4831 BTy->getKind() == BuiltinType::UShort ||
4832 BTy->getKind() == BuiltinType::Int ||
4833 BTy->getKind() == BuiltinType::UInt ||
4834 BTy->getKind() == BuiltinType::Long ||
4835 BTy->getKind() == BuiltinType::ULong ||
4836 BTy->getKind() == BuiltinType::LongLong ||
4837 BTy->getKind() == BuiltinType::ULongLong ||
4838 BTy->getKind() == BuiltinType::Float ||
4839 BTy->getKind() == BuiltinType::Half;
4842 /// HandleNeonVectorTypeAttr - The "neon_vector_type" and
4843 /// "neon_polyvector_type" attributes are used to create vector types that
4844 /// are mangled according to ARM's ABI. Otherwise, these types are identical
4845 /// to those created with the "vector_size" attribute. Unlike "vector_size"
4846 /// the argument to these Neon attributes is the number of vector elements,
4847 /// not the vector size in bytes. The vector width and element type must
4848 /// match one of the standard Neon vector types.
4849 static void HandleNeonVectorTypeAttr(QualType& CurType,
4850 const AttributeList &Attr, Sema &S,
4851 VectorType::VectorKind VecKind) {
4852 // Target must have NEON
4853 if (!S.Context.getTargetInfo().hasFeature("neon")) {
4854 S.Diag(Attr.getLoc(), diag::err_attribute_unsupported) << Attr.getName();
4858 // Check the attribute arguments.
4859 if (Attr.getNumArgs() != 1) {
4860 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments)
4861 << Attr.getName() << 1;
4865 // The number of elements must be an ICE.
4866 Expr *numEltsExpr = static_cast<Expr *>(Attr.getArgAsExpr(0));
4867 llvm::APSInt numEltsInt(32);
4868 if (numEltsExpr->isTypeDependent() || numEltsExpr->isValueDependent() ||
4869 !numEltsExpr->isIntegerConstantExpr(numEltsInt, S.Context)) {
4870 S.Diag(Attr.getLoc(), diag::err_attribute_argument_type)
4871 << Attr.getName() << AANT_ArgumentIntegerConstant
4872 << numEltsExpr->getSourceRange();
4876 // Only certain element types are supported for Neon vectors.
4877 if (!isPermittedNeonBaseType(CurType, VecKind, S)) {
4878 S.Diag(Attr.getLoc(), diag::err_attribute_invalid_vector_type) << CurType;
4883 // The total size of the vector must be 64 or 128 bits.
4884 unsigned typeSize = static_cast<unsigned>(S.Context.getTypeSize(CurType));
4885 unsigned numElts = static_cast<unsigned>(numEltsInt.getZExtValue());
4886 unsigned vecSize = typeSize * numElts;
4887 if (vecSize != 64 && vecSize != 128) {
4888 S.Diag(Attr.getLoc(), diag::err_attribute_bad_neon_vector_size) << CurType;
4893 CurType = S.Context.getVectorType(CurType, numElts, VecKind);
4896 static void processTypeAttrs(TypeProcessingState &state, QualType &type,
4897 TypeAttrLocation TAL, AttributeList *attrs) {
4898 // Scan through and apply attributes to this type where it makes sense. Some
4899 // attributes (such as __address_space__, __vector_size__, etc) apply to the
4900 // type, but others can be present in the type specifiers even though they
4901 // apply to the decl. Here we apply type attributes and ignore the rest.
4903 AttributeList *next;
4905 AttributeList &attr = *attrs;
4906 next = attr.getNext();
4908 // Skip attributes that were marked to be invalid.
4909 if (attr.isInvalid())
4912 if (attr.isCXX11Attribute()) {
4913 // [[gnu::...]] attributes are treated as declaration attributes, so may
4914 // not appertain to a DeclaratorChunk, even if we handle them as type
4916 if (attr.getScopeName() && attr.getScopeName()->isStr("gnu")) {
4917 if (TAL == TAL_DeclChunk) {
4918 state.getSema().Diag(attr.getLoc(),
4919 diag::warn_cxx11_gnu_attribute_on_type)
4923 } else if (TAL != TAL_DeclChunk) {
4924 // Otherwise, only consider type processing for a C++11 attribute if
4925 // it's actually been applied to a type.
4930 // If this is an attribute we can handle, do so now,
4931 // otherwise, add it to the FnAttrs list for rechaining.
4932 switch (attr.getKind()) {
4934 // A C++11 attribute on a declarator chunk must appertain to a type.
4935 if (attr.isCXX11Attribute() && TAL == TAL_DeclChunk) {
4936 state.getSema().Diag(attr.getLoc(), diag::err_attribute_not_type_attr)
4938 attr.setUsedAsTypeAttr();
4942 case AttributeList::UnknownAttribute:
4943 if (attr.isCXX11Attribute() && TAL == TAL_DeclChunk)
4944 state.getSema().Diag(attr.getLoc(),
4945 diag::warn_unknown_attribute_ignored)
4949 case AttributeList::IgnoredAttribute:
4952 case AttributeList::AT_MayAlias:
4953 // FIXME: This attribute needs to actually be handled, but if we ignore
4954 // it it breaks large amounts of Linux software.
4955 attr.setUsedAsTypeAttr();
4957 case AttributeList::AT_OpenCLPrivateAddressSpace:
4958 case AttributeList::AT_OpenCLGlobalAddressSpace:
4959 case AttributeList::AT_OpenCLLocalAddressSpace:
4960 case AttributeList::AT_OpenCLConstantAddressSpace:
4961 case AttributeList::AT_OpenCLGenericAddressSpace:
4962 case AttributeList::AT_AddressSpace:
4963 HandleAddressSpaceTypeAttribute(type, attr, state.getSema());
4964 attr.setUsedAsTypeAttr();
4966 OBJC_POINTER_TYPE_ATTRS_CASELIST:
4967 if (!handleObjCPointerTypeAttr(state, attr, type))
4968 distributeObjCPointerTypeAttr(state, attr, type);
4969 attr.setUsedAsTypeAttr();
4971 case AttributeList::AT_VectorSize:
4972 HandleVectorSizeAttr(type, attr, state.getSema());
4973 attr.setUsedAsTypeAttr();
4975 case AttributeList::AT_ExtVectorType:
4976 HandleExtVectorTypeAttr(type, attr, state.getSema());
4977 attr.setUsedAsTypeAttr();
4979 case AttributeList::AT_NeonVectorType:
4980 HandleNeonVectorTypeAttr(type, attr, state.getSema(),
4981 VectorType::NeonVector);
4982 attr.setUsedAsTypeAttr();
4984 case AttributeList::AT_NeonPolyVectorType:
4985 HandleNeonVectorTypeAttr(type, attr, state.getSema(),
4986 VectorType::NeonPolyVector);
4987 attr.setUsedAsTypeAttr();
4989 case AttributeList::AT_OpenCLImageAccess:
4990 // FIXME: there should be some type checking happening here, I would
4991 // imagine, but the original handler's checking was entirely superfluous.
4992 attr.setUsedAsTypeAttr();
4995 MS_TYPE_ATTRS_CASELIST:
4996 if (!handleMSPointerTypeQualifierAttr(state, attr, type))
4997 attr.setUsedAsTypeAttr();
5000 case AttributeList::AT_NSReturnsRetained:
5001 if (!state.getSema().getLangOpts().ObjCAutoRefCount)
5003 // fallthrough into the function attrs
5005 FUNCTION_TYPE_ATTRS_CASELIST:
5006 attr.setUsedAsTypeAttr();
5008 // Never process function type attributes as part of the
5009 // declaration-specifiers.
5010 if (TAL == TAL_DeclSpec)
5011 distributeFunctionTypeAttrFromDeclSpec(state, attr, type);
5013 // Otherwise, handle the possible delays.
5014 else if (!handleFunctionTypeAttr(state, attr, type))
5015 distributeFunctionTypeAttr(state, attr, type);
5018 } while ((attrs = next));
5021 /// \brief Ensure that the type of the given expression is complete.
5023 /// This routine checks whether the expression \p E has a complete type. If the
5024 /// expression refers to an instantiable construct, that instantiation is
5025 /// performed as needed to complete its type. Furthermore
5026 /// Sema::RequireCompleteType is called for the expression's type (or in the
5027 /// case of a reference type, the referred-to type).
5029 /// \param E The expression whose type is required to be complete.
5030 /// \param Diagnoser The object that will emit a diagnostic if the type is
5033 /// \returns \c true if the type of \p E is incomplete and diagnosed, \c false
5035 bool Sema::RequireCompleteExprType(Expr *E, TypeDiagnoser &Diagnoser){
5036 QualType T = E->getType();
5038 // Fast path the case where the type is already complete.
5039 if (!T->isIncompleteType())
5040 // FIXME: The definition might not be visible.
5043 // Incomplete array types may be completed by the initializer attached to
5044 // their definitions. For static data members of class templates and for
5045 // variable templates, we need to instantiate the definition to get this
5046 // initializer and complete the type.
5047 if (T->isIncompleteArrayType()) {
5048 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E->IgnoreParens())) {
5049 if (VarDecl *Var = dyn_cast<VarDecl>(DRE->getDecl())) {
5050 if (isTemplateInstantiation(Var->getTemplateSpecializationKind())) {
5051 SourceLocation PointOfInstantiation = E->getExprLoc();
5053 if (MemberSpecializationInfo *MSInfo =
5054 Var->getMemberSpecializationInfo()) {
5055 // If we don't already have a point of instantiation, this is it.
5056 if (MSInfo->getPointOfInstantiation().isInvalid()) {
5057 MSInfo->setPointOfInstantiation(PointOfInstantiation);
5059 // This is a modification of an existing AST node. Notify
5061 if (ASTMutationListener *L = getASTMutationListener())
5062 L->StaticDataMemberInstantiated(Var);
5065 VarTemplateSpecializationDecl *VarSpec =
5066 cast<VarTemplateSpecializationDecl>(Var);
5067 if (VarSpec->getPointOfInstantiation().isInvalid())
5068 VarSpec->setPointOfInstantiation(PointOfInstantiation);
5071 InstantiateVariableDefinition(PointOfInstantiation, Var);
5073 // Update the type to the newly instantiated definition's type both
5074 // here and within the expression.
5075 if (VarDecl *Def = Var->getDefinition()) {
5082 // We still go on to try to complete the type independently, as it
5083 // may also require instantiations or diagnostics if it remains
5090 // FIXME: Are there other cases which require instantiating something other
5091 // than the type to complete the type of an expression?
5093 // Look through reference types and complete the referred type.
5094 if (const ReferenceType *Ref = T->getAs<ReferenceType>())
5095 T = Ref->getPointeeType();
5097 return RequireCompleteType(E->getExprLoc(), T, Diagnoser);
5101 struct TypeDiagnoserDiag : Sema::TypeDiagnoser {
5104 TypeDiagnoserDiag(unsigned DiagID)
5105 : Sema::TypeDiagnoser(DiagID == 0), DiagID(DiagID) {}
5107 void diagnose(Sema &S, SourceLocation Loc, QualType T) override {
5108 if (Suppressed) return;
5109 S.Diag(Loc, DiagID) << T;
5114 bool Sema::RequireCompleteExprType(Expr *E, unsigned DiagID) {
5115 TypeDiagnoserDiag Diagnoser(DiagID);
5116 return RequireCompleteExprType(E, Diagnoser);
5119 /// @brief Ensure that the type T is a complete type.
5121 /// This routine checks whether the type @p T is complete in any
5122 /// context where a complete type is required. If @p T is a complete
5123 /// type, returns false. If @p T is a class template specialization,
5124 /// this routine then attempts to perform class template
5125 /// instantiation. If instantiation fails, or if @p T is incomplete
5126 /// and cannot be completed, issues the diagnostic @p diag (giving it
5127 /// the type @p T) and returns true.
5129 /// @param Loc The location in the source that the incomplete type
5130 /// diagnostic should refer to.
5132 /// @param T The type that this routine is examining for completeness.
5134 /// @returns @c true if @p T is incomplete and a diagnostic was emitted,
5135 /// @c false otherwise.
5136 bool Sema::RequireCompleteType(SourceLocation Loc, QualType T,
5137 TypeDiagnoser &Diagnoser) {
5138 if (RequireCompleteTypeImpl(Loc, T, Diagnoser))
5140 if (const TagType *Tag = T->getAs<TagType>()) {
5141 if (!Tag->getDecl()->isCompleteDefinitionRequired()) {
5142 Tag->getDecl()->setCompleteDefinitionRequired();
5143 Consumer.HandleTagDeclRequiredDefinition(Tag->getDecl());
5149 /// \brief Determine whether there is any declaration of \p D that was ever a
5150 /// definition (perhaps before module merging) and is currently visible.
5151 /// \param D The definition of the entity.
5152 /// \param Suggested Filled in with the declaration that should be made visible
5153 /// in order to provide a definition of this entity.
5154 bool Sema::hasVisibleDefinition(NamedDecl *D, NamedDecl **Suggested) {
5155 // Easy case: if we don't have modules, all declarations are visible.
5156 if (!getLangOpts().Modules)
5159 // If this definition was instantiated from a template, map back to the
5160 // pattern from which it was instantiated.
5161 if (isa<TagDecl>(D) && cast<TagDecl>(D)->isBeingDefined()) {
5162 // We're in the middle of defining it; this definition should be treated
5165 } else if (auto *RD = dyn_cast<CXXRecordDecl>(D)) {
5166 if (auto *Pattern = RD->getTemplateInstantiationPattern())
5168 D = RD->getDefinition();
5169 } else if (auto *ED = dyn_cast<EnumDecl>(D)) {
5170 while (auto *NewED = ED->getInstantiatedFromMemberEnum())
5172 if (ED->isFixed()) {
5173 // If the enum has a fixed underlying type, any declaration of it will do.
5174 *Suggested = nullptr;
5175 for (auto *Redecl : ED->redecls()) {
5176 if (LookupResult::isVisible(*this, Redecl))
5178 if (Redecl->isThisDeclarationADefinition() ||
5179 (Redecl->isCanonicalDecl() && !*Suggested))
5180 *Suggested = Redecl;
5184 D = ED->getDefinition();
5186 assert(D && "missing definition for pattern of instantiated definition");
5188 // FIXME: If we merged any other decl into D, and that declaration is visible,
5189 // then we should consider a definition to be visible.
5191 return LookupResult::isVisible(*this, D);
5194 /// Locks in the inheritance model for the given class and all of its bases.
5195 static void assignInheritanceModel(Sema &S, CXXRecordDecl *RD) {
5196 RD = RD->getMostRecentDecl();
5197 if (!RD->hasAttr<MSInheritanceAttr>()) {
5198 MSInheritanceAttr::Spelling IM;
5200 switch (S.MSPointerToMemberRepresentationMethod) {
5201 case LangOptions::PPTMK_BestCase:
5202 IM = RD->calculateInheritanceModel();
5204 case LangOptions::PPTMK_FullGeneralitySingleInheritance:
5205 IM = MSInheritanceAttr::Keyword_single_inheritance;
5207 case LangOptions::PPTMK_FullGeneralityMultipleInheritance:
5208 IM = MSInheritanceAttr::Keyword_multiple_inheritance;
5210 case LangOptions::PPTMK_FullGeneralityVirtualInheritance:
5211 IM = MSInheritanceAttr::Keyword_unspecified_inheritance;
5215 RD->addAttr(MSInheritanceAttr::CreateImplicit(
5216 S.getASTContext(), IM,
5217 /*BestCase=*/S.MSPointerToMemberRepresentationMethod ==
5218 LangOptions::PPTMK_BestCase,
5219 S.ImplicitMSInheritanceAttrLoc.isValid()
5220 ? S.ImplicitMSInheritanceAttrLoc
5221 : RD->getSourceRange()));
5225 /// \brief The implementation of RequireCompleteType
5226 bool Sema::RequireCompleteTypeImpl(SourceLocation Loc, QualType T,
5227 TypeDiagnoser &Diagnoser) {
5228 // FIXME: Add this assertion to make sure we always get instantiation points.
5229 // assert(!Loc.isInvalid() && "Invalid location in RequireCompleteType");
5230 // FIXME: Add this assertion to help us flush out problems with
5231 // checking for dependent types and type-dependent expressions.
5233 // assert(!T->isDependentType() &&
5234 // "Can't ask whether a dependent type is complete");
5236 // If we have a complete type, we're done.
5237 NamedDecl *Def = nullptr;
5238 if (!T->isIncompleteType(&Def)) {
5239 // If we know about the definition but it is not visible, complain.
5240 NamedDecl *SuggestedDef = nullptr;
5241 if (!Diagnoser.Suppressed && Def &&
5242 !hasVisibleDefinition(Def, &SuggestedDef)) {
5243 // Suppress this error outside of a SFINAE context if we've already
5244 // emitted the error once for this type. There's no usefulness in
5245 // repeating the diagnostic.
5246 // FIXME: Add a Fix-It that imports the corresponding module or includes
5248 Module *Owner = getOwningModule(SuggestedDef);
5249 Diag(Loc, diag::err_module_private_definition)
5250 << T << Owner->getFullModuleName();
5251 Diag(SuggestedDef->getLocation(), diag::note_previous_definition);
5253 // Try to recover by implicitly importing this module.
5254 createImplicitModuleImportForErrorRecovery(Loc, Owner);
5257 // We lock in the inheritance model once somebody has asked us to ensure
5258 // that a pointer-to-member type is complete.
5259 if (Context.getTargetInfo().getCXXABI().isMicrosoft()) {
5260 if (const MemberPointerType *MPTy = T->getAs<MemberPointerType>()) {
5261 if (!MPTy->getClass()->isDependentType()) {
5262 RequireCompleteType(Loc, QualType(MPTy->getClass(), 0), 0);
5263 assignInheritanceModel(*this, MPTy->getMostRecentCXXRecordDecl());
5271 const TagType *Tag = T->getAs<TagType>();
5272 const ObjCInterfaceType *IFace = T->getAs<ObjCInterfaceType>();
5274 // If there's an unimported definition of this type in a module (for
5275 // instance, because we forward declared it, then imported the definition),
5276 // import that definition now.
5278 // FIXME: What about other cases where an import extends a redeclaration
5279 // chain for a declaration that can be accessed through a mechanism other
5280 // than name lookup (eg, referenced in a template, or a variable whose type
5281 // could be completed by the module)?
5284 Tag ? static_cast<NamedDecl *>(Tag->getDecl()) : IFace->getDecl();
5286 // Avoid diagnosing invalid decls as incomplete.
5287 if (D->isInvalidDecl())
5290 // Give the external AST source a chance to complete the type.
5291 if (auto *Source = Context.getExternalSource()) {
5293 Source->CompleteType(Tag->getDecl());
5295 Source->CompleteType(IFace->getDecl());
5297 // If the external source completed the type, go through the motions
5298 // again to ensure we're allowed to use the completed type.
5299 if (!T->isIncompleteType())
5300 return RequireCompleteTypeImpl(Loc, T, Diagnoser);
5304 // If we have a class template specialization or a class member of a
5305 // class template specialization, or an array with known size of such,
5306 // try to instantiate it.
5307 QualType MaybeTemplate = T;
5308 while (const ConstantArrayType *Array
5309 = Context.getAsConstantArrayType(MaybeTemplate))
5310 MaybeTemplate = Array->getElementType();
5311 if (const RecordType *Record = MaybeTemplate->getAs<RecordType>()) {
5312 if (ClassTemplateSpecializationDecl *ClassTemplateSpec
5313 = dyn_cast<ClassTemplateSpecializationDecl>(Record->getDecl())) {
5314 if (ClassTemplateSpec->getSpecializationKind() == TSK_Undeclared)
5315 return InstantiateClassTemplateSpecialization(Loc, ClassTemplateSpec,
5316 TSK_ImplicitInstantiation,
5317 /*Complain=*/!Diagnoser.Suppressed);
5318 } else if (CXXRecordDecl *Rec
5319 = dyn_cast<CXXRecordDecl>(Record->getDecl())) {
5320 CXXRecordDecl *Pattern = Rec->getInstantiatedFromMemberClass();
5321 if (!Rec->isBeingDefined() && Pattern) {
5322 MemberSpecializationInfo *MSI = Rec->getMemberSpecializationInfo();
5323 assert(MSI && "Missing member specialization information?");
5324 // This record was instantiated from a class within a template.
5325 if (MSI->getTemplateSpecializationKind() != TSK_ExplicitSpecialization)
5326 return InstantiateClass(Loc, Rec, Pattern,
5327 getTemplateInstantiationArgs(Rec),
5328 TSK_ImplicitInstantiation,
5329 /*Complain=*/!Diagnoser.Suppressed);
5334 if (Diagnoser.Suppressed)
5337 // We have an incomplete type. Produce a diagnostic.
5338 if (Ident___float128 &&
5339 T == Context.getTypeDeclType(Context.getFloat128StubType())) {
5340 Diag(Loc, diag::err_typecheck_decl_incomplete_type___float128);
5344 Diagnoser.diagnose(*this, Loc, T);
5346 // If the type was a forward declaration of a class/struct/union
5347 // type, produce a note.
5348 if (Tag && !Tag->getDecl()->isInvalidDecl())
5349 Diag(Tag->getDecl()->getLocation(),
5350 Tag->isBeingDefined() ? diag::note_type_being_defined
5351 : diag::note_forward_declaration)
5352 << QualType(Tag, 0);
5354 // If the Objective-C class was a forward declaration, produce a note.
5355 if (IFace && !IFace->getDecl()->isInvalidDecl())
5356 Diag(IFace->getDecl()->getLocation(), diag::note_forward_class);
5358 // If we have external information that we can use to suggest a fix,
5361 ExternalSource->MaybeDiagnoseMissingCompleteType(Loc, T);
5366 bool Sema::RequireCompleteType(SourceLocation Loc, QualType T,
5368 TypeDiagnoserDiag Diagnoser(DiagID);
5369 return RequireCompleteType(Loc, T, Diagnoser);
5372 /// \brief Get diagnostic %select index for tag kind for
5373 /// literal type diagnostic message.
5374 /// WARNING: Indexes apply to particular diagnostics only!
5376 /// \returns diagnostic %select index.
5377 static unsigned getLiteralDiagFromTagKind(TagTypeKind Tag) {
5379 case TTK_Struct: return 0;
5380 case TTK_Interface: return 1;
5381 case TTK_Class: return 2;
5382 default: llvm_unreachable("Invalid tag kind for literal type diagnostic!");
5386 /// @brief Ensure that the type T is a literal type.
5388 /// This routine checks whether the type @p T is a literal type. If @p T is an
5389 /// incomplete type, an attempt is made to complete it. If @p T is a literal
5390 /// type, or @p AllowIncompleteType is true and @p T is an incomplete type,
5391 /// returns false. Otherwise, this routine issues the diagnostic @p PD (giving
5392 /// it the type @p T), along with notes explaining why the type is not a
5393 /// literal type, and returns true.
5395 /// @param Loc The location in the source that the non-literal type
5396 /// diagnostic should refer to.
5398 /// @param T The type that this routine is examining for literalness.
5400 /// @param Diagnoser Emits a diagnostic if T is not a literal type.
5402 /// @returns @c true if @p T is not a literal type and a diagnostic was emitted,
5403 /// @c false otherwise.
5404 bool Sema::RequireLiteralType(SourceLocation Loc, QualType T,
5405 TypeDiagnoser &Diagnoser) {
5406 assert(!T->isDependentType() && "type should not be dependent");
5408 QualType ElemType = Context.getBaseElementType(T);
5409 RequireCompleteType(Loc, ElemType, 0);
5411 if (T->isLiteralType(Context))
5414 if (Diagnoser.Suppressed)
5417 Diagnoser.diagnose(*this, Loc, T);
5419 if (T->isVariableArrayType())
5422 const RecordType *RT = ElemType->getAs<RecordType>();
5426 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl());
5428 // A partially-defined class type can't be a literal type, because a literal
5429 // class type must have a trivial destructor (which can't be checked until
5430 // the class definition is complete).
5431 if (!RD->isCompleteDefinition()) {
5432 RequireCompleteType(Loc, ElemType, diag::note_non_literal_incomplete, T);
5436 // If the class has virtual base classes, then it's not an aggregate, and
5437 // cannot have any constexpr constructors or a trivial default constructor,
5438 // so is non-literal. This is better to diagnose than the resulting absence
5439 // of constexpr constructors.
5440 if (RD->getNumVBases()) {
5441 Diag(RD->getLocation(), diag::note_non_literal_virtual_base)
5442 << getLiteralDiagFromTagKind(RD->getTagKind()) << RD->getNumVBases();
5443 for (const auto &I : RD->vbases())
5444 Diag(I.getLocStart(), diag::note_constexpr_virtual_base_here)
5445 << I.getSourceRange();
5446 } else if (!RD->isAggregate() && !RD->hasConstexprNonCopyMoveConstructor() &&
5447 !RD->hasTrivialDefaultConstructor()) {
5448 Diag(RD->getLocation(), diag::note_non_literal_no_constexpr_ctors) << RD;
5449 } else if (RD->hasNonLiteralTypeFieldsOrBases()) {
5450 for (const auto &I : RD->bases()) {
5451 if (!I.getType()->isLiteralType(Context)) {
5452 Diag(I.getLocStart(),
5453 diag::note_non_literal_base_class)
5454 << RD << I.getType() << I.getSourceRange();
5458 for (const auto *I : RD->fields()) {
5459 if (!I->getType()->isLiteralType(Context) ||
5460 I->getType().isVolatileQualified()) {
5461 Diag(I->getLocation(), diag::note_non_literal_field)
5462 << RD << I << I->getType()
5463 << I->getType().isVolatileQualified();
5467 } else if (!RD->hasTrivialDestructor()) {
5468 // All fields and bases are of literal types, so have trivial destructors.
5469 // If this class's destructor is non-trivial it must be user-declared.
5470 CXXDestructorDecl *Dtor = RD->getDestructor();
5471 assert(Dtor && "class has literal fields and bases but no dtor?");
5475 Diag(Dtor->getLocation(), Dtor->isUserProvided() ?
5476 diag::note_non_literal_user_provided_dtor :
5477 diag::note_non_literal_nontrivial_dtor) << RD;
5478 if (!Dtor->isUserProvided())
5479 SpecialMemberIsTrivial(Dtor, CXXDestructor, /*Diagnose*/true);
5485 bool Sema::RequireLiteralType(SourceLocation Loc, QualType T, unsigned DiagID) {
5486 TypeDiagnoserDiag Diagnoser(DiagID);
5487 return RequireLiteralType(Loc, T, Diagnoser);
5490 /// \brief Retrieve a version of the type 'T' that is elaborated by Keyword
5491 /// and qualified by the nested-name-specifier contained in SS.
5492 QualType Sema::getElaboratedType(ElaboratedTypeKeyword Keyword,
5493 const CXXScopeSpec &SS, QualType T) {
5496 NestedNameSpecifier *NNS;
5498 NNS = SS.getScopeRep();
5500 if (Keyword == ETK_None)
5504 return Context.getElaboratedType(Keyword, NNS, T);
5507 QualType Sema::BuildTypeofExprType(Expr *E, SourceLocation Loc) {
5508 ExprResult ER = CheckPlaceholderExpr(E);
5509 if (ER.isInvalid()) return QualType();
5512 if (!E->isTypeDependent()) {
5513 QualType T = E->getType();
5514 if (const TagType *TT = T->getAs<TagType>())
5515 DiagnoseUseOfDecl(TT->getDecl(), E->getExprLoc());
5517 return Context.getTypeOfExprType(E);
5520 /// getDecltypeForExpr - Given an expr, will return the decltype for
5521 /// that expression, according to the rules in C++11
5522 /// [dcl.type.simple]p4 and C++11 [expr.lambda.prim]p18.
5523 static QualType getDecltypeForExpr(Sema &S, Expr *E) {
5524 if (E->isTypeDependent())
5525 return S.Context.DependentTy;
5527 // C++11 [dcl.type.simple]p4:
5528 // The type denoted by decltype(e) is defined as follows:
5530 // - if e is an unparenthesized id-expression or an unparenthesized class
5531 // member access (5.2.5), decltype(e) is the type of the entity named
5532 // by e. If there is no such entity, or if e names a set of overloaded
5533 // functions, the program is ill-formed;
5535 // We apply the same rules for Objective-C ivar and property references.
5536 if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E)) {
5537 if (const ValueDecl *VD = dyn_cast<ValueDecl>(DRE->getDecl()))
5538 return VD->getType();
5539 } else if (const MemberExpr *ME = dyn_cast<MemberExpr>(E)) {
5540 if (const FieldDecl *FD = dyn_cast<FieldDecl>(ME->getMemberDecl()))
5541 return FD->getType();
5542 } else if (const ObjCIvarRefExpr *IR = dyn_cast<ObjCIvarRefExpr>(E)) {
5543 return IR->getDecl()->getType();
5544 } else if (const ObjCPropertyRefExpr *PR = dyn_cast<ObjCPropertyRefExpr>(E)) {
5545 if (PR->isExplicitProperty())
5546 return PR->getExplicitProperty()->getType();
5547 } else if (auto *PE = dyn_cast<PredefinedExpr>(E)) {
5548 return PE->getType();
5551 // C++11 [expr.lambda.prim]p18:
5552 // Every occurrence of decltype((x)) where x is a possibly
5553 // parenthesized id-expression that names an entity of automatic
5554 // storage duration is treated as if x were transformed into an
5555 // access to a corresponding data member of the closure type that
5556 // would have been declared if x were an odr-use of the denoted
5558 using namespace sema;
5559 if (S.getCurLambda()) {
5560 if (isa<ParenExpr>(E)) {
5561 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E->IgnoreParens())) {
5562 if (VarDecl *Var = dyn_cast<VarDecl>(DRE->getDecl())) {
5563 QualType T = S.getCapturedDeclRefType(Var, DRE->getLocation());
5565 return S.Context.getLValueReferenceType(T);
5572 // C++11 [dcl.type.simple]p4:
5574 QualType T = E->getType();
5575 switch (E->getValueKind()) {
5576 // - otherwise, if e is an xvalue, decltype(e) is T&&, where T is the
5578 case VK_XValue: T = S.Context.getRValueReferenceType(T); break;
5579 // - otherwise, if e is an lvalue, decltype(e) is T&, where T is the
5581 case VK_LValue: T = S.Context.getLValueReferenceType(T); break;
5582 // - otherwise, decltype(e) is the type of e.
5583 case VK_RValue: break;
5589 QualType Sema::BuildDecltypeType(Expr *E, SourceLocation Loc,
5590 bool AsUnevaluated) {
5591 ExprResult ER = CheckPlaceholderExpr(E);
5592 if (ER.isInvalid()) return QualType();
5595 if (AsUnevaluated && ActiveTemplateInstantiations.empty() &&
5596 E->HasSideEffects(Context, false)) {
5597 // The expression operand for decltype is in an unevaluated expression
5598 // context, so side effects could result in unintended consequences.
5599 Diag(E->getExprLoc(), diag::warn_side_effects_unevaluated_context);
5602 return Context.getDecltypeType(E, getDecltypeForExpr(*this, E));
5605 QualType Sema::BuildUnaryTransformType(QualType BaseType,
5606 UnaryTransformType::UTTKind UKind,
5607 SourceLocation Loc) {
5609 case UnaryTransformType::EnumUnderlyingType:
5610 if (!BaseType->isDependentType() && !BaseType->isEnumeralType()) {
5611 Diag(Loc, diag::err_only_enums_have_underlying_types);
5614 QualType Underlying = BaseType;
5615 if (!BaseType->isDependentType()) {
5616 // The enum could be incomplete if we're parsing its definition or
5617 // recovering from an error.
5618 NamedDecl *FwdDecl = nullptr;
5619 if (BaseType->isIncompleteType(&FwdDecl)) {
5620 Diag(Loc, diag::err_underlying_type_of_incomplete_enum) << BaseType;
5621 Diag(FwdDecl->getLocation(), diag::note_forward_declaration) << FwdDecl;
5625 EnumDecl *ED = BaseType->getAs<EnumType>()->getDecl();
5626 assert(ED && "EnumType has no EnumDecl");
5628 DiagnoseUseOfDecl(ED, Loc);
5630 Underlying = ED->getIntegerType();
5631 assert(!Underlying.isNull());
5633 return Context.getUnaryTransformType(BaseType, Underlying,
5634 UnaryTransformType::EnumUnderlyingType);
5637 llvm_unreachable("unknown unary transform type");
5640 QualType Sema::BuildAtomicType(QualType T, SourceLocation Loc) {
5641 if (!T->isDependentType()) {
5642 // FIXME: It isn't entirely clear whether incomplete atomic types
5643 // are allowed or not; for simplicity, ban them for the moment.
5644 if (RequireCompleteType(Loc, T, diag::err_atomic_specifier_bad_type, 0))
5647 int DisallowedKind = -1;
5648 if (T->isArrayType())
5650 else if (T->isFunctionType())
5652 else if (T->isReferenceType())
5654 else if (T->isAtomicType())
5656 else if (T.hasQualifiers())
5658 else if (!T.isTriviallyCopyableType(Context))
5659 // Some other non-trivially-copyable type (probably a C++ class)
5662 if (DisallowedKind != -1) {
5663 Diag(Loc, diag::err_atomic_specifier_bad_type) << DisallowedKind << T;
5667 // FIXME: Do we need any handling for ARC here?
5670 // Build the pointer type.
5671 return Context.getAtomicType(T);