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 "TypeLocBuilder.h"
15 #include "clang/AST/ASTConsumer.h"
16 #include "clang/AST/ASTContext.h"
17 #include "clang/AST/ASTMutationListener.h"
18 #include "clang/AST/ASTStructuralEquivalence.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/Lex/Preprocessor.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/SemaInternal.h"
33 #include "clang/Sema/Template.h"
34 #include "llvm/ADT/SmallPtrSet.h"
35 #include "llvm/ADT/SmallString.h"
36 #include "llvm/ADT/StringSwitch.h"
37 #include "llvm/Support/ErrorHandling.h"
39 using namespace clang;
41 enum TypeDiagSelector {
47 /// isOmittedBlockReturnType - Return true if this declarator is missing a
48 /// return type because this is a omitted return type on a block literal.
49 static bool isOmittedBlockReturnType(const Declarator &D) {
50 if (D.getContext() != Declarator::BlockLiteralContext ||
51 D.getDeclSpec().hasTypeSpecifier())
54 if (D.getNumTypeObjects() == 0)
55 return true; // ^{ ... }
57 if (D.getNumTypeObjects() == 1 &&
58 D.getTypeObject(0).Kind == DeclaratorChunk::Function)
59 return true; // ^(int X, float Y) { ... }
64 /// diagnoseBadTypeAttribute - Diagnoses a type attribute which
65 /// doesn't apply to the given type.
66 static void diagnoseBadTypeAttribute(Sema &S, const AttributeList &attr,
68 TypeDiagSelector WhichType;
69 bool useExpansionLoc = true;
70 switch (attr.getKind()) {
71 case AttributeList::AT_ObjCGC: WhichType = TDS_Pointer; break;
72 case AttributeList::AT_ObjCOwnership: WhichType = TDS_ObjCObjOrBlock; break;
74 // Assume everything else was a function attribute.
75 WhichType = TDS_Function;
76 useExpansionLoc = false;
80 SourceLocation loc = attr.getLoc();
81 StringRef name = attr.getName()->getName();
83 // The GC attributes are usually written with macros; special-case them.
84 IdentifierInfo *II = attr.isArgIdent(0) ? attr.getArgAsIdent(0)->Ident
86 if (useExpansionLoc && loc.isMacroID() && II) {
87 if (II->isStr("strong")) {
88 if (S.findMacroSpelling(loc, "__strong")) name = "__strong";
89 } else if (II->isStr("weak")) {
90 if (S.findMacroSpelling(loc, "__weak")) name = "__weak";
94 S.Diag(loc, diag::warn_type_attribute_wrong_type) << name << WhichType
98 // objc_gc applies to Objective-C pointers or, otherwise, to the
99 // smallest available pointer type (i.e. 'void*' in 'void**').
100 #define OBJC_POINTER_TYPE_ATTRS_CASELIST \
101 case AttributeList::AT_ObjCGC: \
102 case AttributeList::AT_ObjCOwnership
104 // Calling convention attributes.
105 #define CALLING_CONV_ATTRS_CASELIST \
106 case AttributeList::AT_CDecl: \
107 case AttributeList::AT_FastCall: \
108 case AttributeList::AT_StdCall: \
109 case AttributeList::AT_ThisCall: \
110 case AttributeList::AT_RegCall: \
111 case AttributeList::AT_Pascal: \
112 case AttributeList::AT_SwiftCall: \
113 case AttributeList::AT_VectorCall: \
114 case AttributeList::AT_MSABI: \
115 case AttributeList::AT_SysVABI: \
116 case AttributeList::AT_Pcs: \
117 case AttributeList::AT_IntelOclBicc: \
118 case AttributeList::AT_PreserveMost: \
119 case AttributeList::AT_PreserveAll
121 // Function type attributes.
122 #define FUNCTION_TYPE_ATTRS_CASELIST \
123 case AttributeList::AT_NSReturnsRetained: \
124 case AttributeList::AT_NoReturn: \
125 case AttributeList::AT_Regparm: \
126 case AttributeList::AT_AnyX86NoCallerSavedRegisters: \
127 CALLING_CONV_ATTRS_CASELIST
129 // Microsoft-specific type qualifiers.
130 #define MS_TYPE_ATTRS_CASELIST \
131 case AttributeList::AT_Ptr32: \
132 case AttributeList::AT_Ptr64: \
133 case AttributeList::AT_SPtr: \
134 case AttributeList::AT_UPtr
136 // Nullability qualifiers.
137 #define NULLABILITY_TYPE_ATTRS_CASELIST \
138 case AttributeList::AT_TypeNonNull: \
139 case AttributeList::AT_TypeNullable: \
140 case AttributeList::AT_TypeNullUnspecified
143 /// An object which stores processing state for the entire
144 /// GetTypeForDeclarator process.
145 class TypeProcessingState {
148 /// The declarator being processed.
149 Declarator &declarator;
151 /// The index of the declarator chunk we're currently processing.
152 /// May be the total number of valid chunks, indicating the
156 /// Whether there are non-trivial modifications to the decl spec.
159 /// Whether we saved the attributes in the decl spec.
162 /// The original set of attributes on the DeclSpec.
163 SmallVector<AttributeList*, 2> savedAttrs;
165 /// A list of attributes to diagnose the uselessness of when the
166 /// processing is complete.
167 SmallVector<AttributeList*, 2> ignoredTypeAttrs;
170 TypeProcessingState(Sema &sema, Declarator &declarator)
171 : sema(sema), declarator(declarator),
172 chunkIndex(declarator.getNumTypeObjects()),
173 trivial(true), hasSavedAttrs(false) {}
175 Sema &getSema() const {
179 Declarator &getDeclarator() const {
183 bool isProcessingDeclSpec() const {
184 return chunkIndex == declarator.getNumTypeObjects();
187 unsigned getCurrentChunkIndex() const {
191 void setCurrentChunkIndex(unsigned idx) {
192 assert(idx <= declarator.getNumTypeObjects());
196 AttributeList *&getCurrentAttrListRef() const {
197 if (isProcessingDeclSpec())
198 return getMutableDeclSpec().getAttributes().getListRef();
199 return declarator.getTypeObject(chunkIndex).getAttrListRef();
202 /// Save the current set of attributes on the DeclSpec.
203 void saveDeclSpecAttrs() {
204 // Don't try to save them multiple times.
205 if (hasSavedAttrs) return;
207 DeclSpec &spec = getMutableDeclSpec();
208 for (AttributeList *attr = spec.getAttributes().getList(); attr;
209 attr = attr->getNext())
210 savedAttrs.push_back(attr);
211 trivial &= savedAttrs.empty();
212 hasSavedAttrs = true;
215 /// Record that we had nowhere to put the given type attribute.
216 /// We will diagnose such attributes later.
217 void addIgnoredTypeAttr(AttributeList &attr) {
218 ignoredTypeAttrs.push_back(&attr);
221 /// Diagnose all the ignored type attributes, given that the
222 /// declarator worked out to the given type.
223 void diagnoseIgnoredTypeAttrs(QualType type) const {
224 for (auto *Attr : ignoredTypeAttrs)
225 diagnoseBadTypeAttribute(getSema(), *Attr, type);
228 ~TypeProcessingState() {
231 restoreDeclSpecAttrs();
235 DeclSpec &getMutableDeclSpec() const {
236 return const_cast<DeclSpec&>(declarator.getDeclSpec());
239 void restoreDeclSpecAttrs() {
240 assert(hasSavedAttrs);
242 if (savedAttrs.empty()) {
243 getMutableDeclSpec().getAttributes().set(nullptr);
247 getMutableDeclSpec().getAttributes().set(savedAttrs[0]);
248 for (unsigned i = 0, e = savedAttrs.size() - 1; i != e; ++i)
249 savedAttrs[i]->setNext(savedAttrs[i+1]);
250 savedAttrs.back()->setNext(nullptr);
253 } // end anonymous namespace
255 static void spliceAttrIntoList(AttributeList &attr, AttributeList *&head) {
260 static void spliceAttrOutOfList(AttributeList &attr, AttributeList *&head) {
262 head = attr.getNext();
266 AttributeList *cur = head;
268 assert(cur && cur->getNext() && "ran out of attrs?");
269 if (cur->getNext() == &attr) {
270 cur->setNext(attr.getNext());
273 cur = cur->getNext();
277 static void moveAttrFromListToList(AttributeList &attr,
278 AttributeList *&fromList,
279 AttributeList *&toList) {
280 spliceAttrOutOfList(attr, fromList);
281 spliceAttrIntoList(attr, toList);
284 /// The location of a type attribute.
285 enum TypeAttrLocation {
286 /// The attribute is in the decl-specifier-seq.
288 /// The attribute is part of a DeclaratorChunk.
290 /// The attribute is immediately after the declaration's name.
294 static void processTypeAttrs(TypeProcessingState &state,
295 QualType &type, TypeAttrLocation TAL,
296 AttributeList *attrs);
298 static bool handleFunctionTypeAttr(TypeProcessingState &state,
302 static bool handleMSPointerTypeQualifierAttr(TypeProcessingState &state,
306 static bool handleObjCGCTypeAttr(TypeProcessingState &state,
307 AttributeList &attr, QualType &type);
309 static bool handleObjCOwnershipTypeAttr(TypeProcessingState &state,
310 AttributeList &attr, QualType &type);
312 static bool handleObjCPointerTypeAttr(TypeProcessingState &state,
313 AttributeList &attr, QualType &type) {
314 if (attr.getKind() == AttributeList::AT_ObjCGC)
315 return handleObjCGCTypeAttr(state, attr, type);
316 assert(attr.getKind() == AttributeList::AT_ObjCOwnership);
317 return handleObjCOwnershipTypeAttr(state, attr, type);
320 /// Given the index of a declarator chunk, check whether that chunk
321 /// directly specifies the return type of a function and, if so, find
322 /// an appropriate place for it.
324 /// \param i - a notional index which the search will start
325 /// immediately inside
327 /// \param onlyBlockPointers Whether we should only look into block
328 /// pointer types (vs. all pointer types).
329 static DeclaratorChunk *maybeMovePastReturnType(Declarator &declarator,
331 bool onlyBlockPointers) {
332 assert(i <= declarator.getNumTypeObjects());
334 DeclaratorChunk *result = nullptr;
336 // First, look inwards past parens for a function declarator.
337 for (; i != 0; --i) {
338 DeclaratorChunk &fnChunk = declarator.getTypeObject(i-1);
339 switch (fnChunk.Kind) {
340 case DeclaratorChunk::Paren:
343 // If we find anything except a function, bail out.
344 case DeclaratorChunk::Pointer:
345 case DeclaratorChunk::BlockPointer:
346 case DeclaratorChunk::Array:
347 case DeclaratorChunk::Reference:
348 case DeclaratorChunk::MemberPointer:
349 case DeclaratorChunk::Pipe:
352 // If we do find a function declarator, scan inwards from that,
353 // looking for a (block-)pointer declarator.
354 case DeclaratorChunk::Function:
355 for (--i; i != 0; --i) {
356 DeclaratorChunk &ptrChunk = declarator.getTypeObject(i-1);
357 switch (ptrChunk.Kind) {
358 case DeclaratorChunk::Paren:
359 case DeclaratorChunk::Array:
360 case DeclaratorChunk::Function:
361 case DeclaratorChunk::Reference:
362 case DeclaratorChunk::Pipe:
365 case DeclaratorChunk::MemberPointer:
366 case DeclaratorChunk::Pointer:
367 if (onlyBlockPointers)
372 case DeclaratorChunk::BlockPointer:
376 llvm_unreachable("bad declarator chunk kind");
379 // If we run out of declarators doing that, we're done.
382 llvm_unreachable("bad declarator chunk kind");
384 // Okay, reconsider from our new point.
388 // Ran out of chunks, bail out.
392 /// Given that an objc_gc attribute was written somewhere on a
393 /// declaration *other* than on the declarator itself (for which, use
394 /// distributeObjCPointerTypeAttrFromDeclarator), and given that it
395 /// didn't apply in whatever position it was written in, try to move
396 /// it to a more appropriate position.
397 static void distributeObjCPointerTypeAttr(TypeProcessingState &state,
400 Declarator &declarator = state.getDeclarator();
402 // Move it to the outermost normal or block pointer declarator.
403 for (unsigned i = state.getCurrentChunkIndex(); i != 0; --i) {
404 DeclaratorChunk &chunk = declarator.getTypeObject(i-1);
405 switch (chunk.Kind) {
406 case DeclaratorChunk::Pointer:
407 case DeclaratorChunk::BlockPointer: {
408 // But don't move an ARC ownership attribute to the return type
410 DeclaratorChunk *destChunk = nullptr;
411 if (state.isProcessingDeclSpec() &&
412 attr.getKind() == AttributeList::AT_ObjCOwnership)
413 destChunk = maybeMovePastReturnType(declarator, i - 1,
414 /*onlyBlockPointers=*/true);
415 if (!destChunk) destChunk = &chunk;
417 moveAttrFromListToList(attr, state.getCurrentAttrListRef(),
418 destChunk->getAttrListRef());
422 case DeclaratorChunk::Paren:
423 case DeclaratorChunk::Array:
426 // We may be starting at the return type of a block.
427 case DeclaratorChunk::Function:
428 if (state.isProcessingDeclSpec() &&
429 attr.getKind() == AttributeList::AT_ObjCOwnership) {
430 if (DeclaratorChunk *dest = maybeMovePastReturnType(
432 /*onlyBlockPointers=*/true)) {
433 moveAttrFromListToList(attr, state.getCurrentAttrListRef(),
434 dest->getAttrListRef());
440 // Don't walk through these.
441 case DeclaratorChunk::Reference:
442 case DeclaratorChunk::MemberPointer:
443 case DeclaratorChunk::Pipe:
449 diagnoseBadTypeAttribute(state.getSema(), attr, type);
452 /// Distribute an objc_gc type attribute that was written on the
455 distributeObjCPointerTypeAttrFromDeclarator(TypeProcessingState &state,
457 QualType &declSpecType) {
458 Declarator &declarator = state.getDeclarator();
460 // objc_gc goes on the innermost pointer to something that's not a
462 unsigned innermost = -1U;
463 bool considerDeclSpec = true;
464 for (unsigned i = 0, e = declarator.getNumTypeObjects(); i != e; ++i) {
465 DeclaratorChunk &chunk = declarator.getTypeObject(i);
466 switch (chunk.Kind) {
467 case DeclaratorChunk::Pointer:
468 case DeclaratorChunk::BlockPointer:
472 case DeclaratorChunk::Reference:
473 case DeclaratorChunk::MemberPointer:
474 case DeclaratorChunk::Paren:
475 case DeclaratorChunk::Array:
476 case DeclaratorChunk::Pipe:
479 case DeclaratorChunk::Function:
480 considerDeclSpec = false;
486 // That might actually be the decl spec if we weren't blocked by
487 // anything in the declarator.
488 if (considerDeclSpec) {
489 if (handleObjCPointerTypeAttr(state, attr, declSpecType)) {
490 // Splice the attribute into the decl spec. Prevents the
491 // attribute from being applied multiple times and gives
492 // the source-location-filler something to work with.
493 state.saveDeclSpecAttrs();
494 moveAttrFromListToList(attr, declarator.getAttrListRef(),
495 declarator.getMutableDeclSpec().getAttributes().getListRef());
500 // Otherwise, if we found an appropriate chunk, splice the attribute
502 if (innermost != -1U) {
503 moveAttrFromListToList(attr, declarator.getAttrListRef(),
504 declarator.getTypeObject(innermost).getAttrListRef());
508 // Otherwise, diagnose when we're done building the type.
509 spliceAttrOutOfList(attr, declarator.getAttrListRef());
510 state.addIgnoredTypeAttr(attr);
513 /// A function type attribute was written somewhere in a declaration
514 /// *other* than on the declarator itself or in the decl spec. Given
515 /// that it didn't apply in whatever position it was written in, try
516 /// to move it to a more appropriate position.
517 static void distributeFunctionTypeAttr(TypeProcessingState &state,
520 Declarator &declarator = state.getDeclarator();
522 // Try to push the attribute from the return type of a function to
523 // the function itself.
524 for (unsigned i = state.getCurrentChunkIndex(); i != 0; --i) {
525 DeclaratorChunk &chunk = declarator.getTypeObject(i-1);
526 switch (chunk.Kind) {
527 case DeclaratorChunk::Function:
528 moveAttrFromListToList(attr, state.getCurrentAttrListRef(),
529 chunk.getAttrListRef());
532 case DeclaratorChunk::Paren:
533 case DeclaratorChunk::Pointer:
534 case DeclaratorChunk::BlockPointer:
535 case DeclaratorChunk::Array:
536 case DeclaratorChunk::Reference:
537 case DeclaratorChunk::MemberPointer:
538 case DeclaratorChunk::Pipe:
543 diagnoseBadTypeAttribute(state.getSema(), attr, type);
546 /// Try to distribute a function type attribute to the innermost
547 /// function chunk or type. Returns true if the attribute was
548 /// distributed, false if no location was found.
550 distributeFunctionTypeAttrToInnermost(TypeProcessingState &state,
552 AttributeList *&attrList,
553 QualType &declSpecType) {
554 Declarator &declarator = state.getDeclarator();
556 // Put it on the innermost function chunk, if there is one.
557 for (unsigned i = 0, e = declarator.getNumTypeObjects(); i != e; ++i) {
558 DeclaratorChunk &chunk = declarator.getTypeObject(i);
559 if (chunk.Kind != DeclaratorChunk::Function) continue;
561 moveAttrFromListToList(attr, attrList, chunk.getAttrListRef());
565 return handleFunctionTypeAttr(state, attr, declSpecType);
568 /// A function type attribute was written in the decl spec. Try to
569 /// apply it somewhere.
571 distributeFunctionTypeAttrFromDeclSpec(TypeProcessingState &state,
573 QualType &declSpecType) {
574 state.saveDeclSpecAttrs();
576 // C++11 attributes before the decl specifiers actually appertain to
577 // the declarators. Move them straight there. We don't support the
578 // 'put them wherever you like' semantics we allow for GNU attributes.
579 if (attr.isCXX11Attribute()) {
580 moveAttrFromListToList(attr, state.getCurrentAttrListRef(),
581 state.getDeclarator().getAttrListRef());
585 // Try to distribute to the innermost.
586 if (distributeFunctionTypeAttrToInnermost(state, attr,
587 state.getCurrentAttrListRef(),
591 // If that failed, diagnose the bad attribute when the declarator is
593 state.addIgnoredTypeAttr(attr);
596 /// A function type attribute was written on the declarator. Try to
597 /// apply it somewhere.
599 distributeFunctionTypeAttrFromDeclarator(TypeProcessingState &state,
601 QualType &declSpecType) {
602 Declarator &declarator = state.getDeclarator();
604 // Try to distribute to the innermost.
605 if (distributeFunctionTypeAttrToInnermost(state, attr,
606 declarator.getAttrListRef(),
610 // If that failed, diagnose the bad attribute when the declarator is
612 spliceAttrOutOfList(attr, declarator.getAttrListRef());
613 state.addIgnoredTypeAttr(attr);
616 /// \brief Given that there are attributes written on the declarator
617 /// itself, try to distribute any type attributes to the appropriate
618 /// declarator chunk.
620 /// These are attributes like the following:
623 /// but not necessarily this:
625 static void distributeTypeAttrsFromDeclarator(TypeProcessingState &state,
626 QualType &declSpecType) {
627 // Collect all the type attributes from the declarator itself.
628 assert(state.getDeclarator().getAttributes() && "declarator has no attrs!");
629 AttributeList *attr = state.getDeclarator().getAttributes();
632 next = attr->getNext();
634 // Do not distribute C++11 attributes. They have strict rules for what
635 // they appertain to.
636 if (attr->isCXX11Attribute())
639 switch (attr->getKind()) {
640 OBJC_POINTER_TYPE_ATTRS_CASELIST:
641 distributeObjCPointerTypeAttrFromDeclarator(state, *attr, declSpecType);
644 FUNCTION_TYPE_ATTRS_CASELIST:
645 distributeFunctionTypeAttrFromDeclarator(state, *attr, declSpecType);
648 MS_TYPE_ATTRS_CASELIST:
649 // Microsoft type attributes cannot go after the declarator-id.
652 NULLABILITY_TYPE_ATTRS_CASELIST:
653 // Nullability specifiers cannot go after the declarator-id.
655 // Objective-C __kindof does not get distributed.
656 case AttributeList::AT_ObjCKindOf:
662 } while ((attr = next));
665 /// Add a synthetic '()' to a block-literal declarator if it is
666 /// required, given the return type.
667 static void maybeSynthesizeBlockSignature(TypeProcessingState &state,
668 QualType declSpecType) {
669 Declarator &declarator = state.getDeclarator();
671 // First, check whether the declarator would produce a function,
672 // i.e. whether the innermost semantic chunk is a function.
673 if (declarator.isFunctionDeclarator()) {
674 // If so, make that declarator a prototyped declarator.
675 declarator.getFunctionTypeInfo().hasPrototype = true;
679 // If there are any type objects, the type as written won't name a
680 // function, regardless of the decl spec type. This is because a
681 // block signature declarator is always an abstract-declarator, and
682 // abstract-declarators can't just be parentheses chunks. Therefore
683 // we need to build a function chunk unless there are no type
684 // objects and the decl spec type is a function.
685 if (!declarator.getNumTypeObjects() && declSpecType->isFunctionType())
688 // Note that there *are* cases with invalid declarators where
689 // declarators consist solely of parentheses. In general, these
690 // occur only in failed efforts to make function declarators, so
691 // faking up the function chunk is still the right thing to do.
693 // Otherwise, we need to fake up a function declarator.
694 SourceLocation loc = declarator.getLocStart();
696 // ...and *prepend* it to the declarator.
697 SourceLocation NoLoc;
698 declarator.AddInnermostTypeInfo(DeclaratorChunk::getFunction(
700 /*IsAmbiguous=*/false,
704 /*EllipsisLoc=*/NoLoc,
707 /*RefQualifierIsLvalueRef=*/true,
708 /*RefQualifierLoc=*/NoLoc,
709 /*ConstQualifierLoc=*/NoLoc,
710 /*VolatileQualifierLoc=*/NoLoc,
711 /*RestrictQualifierLoc=*/NoLoc,
712 /*MutableLoc=*/NoLoc, EST_None,
713 /*ESpecRange=*/SourceRange(),
714 /*Exceptions=*/nullptr,
715 /*ExceptionRanges=*/nullptr,
717 /*NoexceptExpr=*/nullptr,
718 /*ExceptionSpecTokens=*/nullptr,
719 /*DeclsInPrototype=*/None,
720 loc, loc, declarator));
722 // For consistency, make sure the state still has us as processing
724 assert(state.getCurrentChunkIndex() == declarator.getNumTypeObjects() - 1);
725 state.setCurrentChunkIndex(declarator.getNumTypeObjects());
728 static void diagnoseAndRemoveTypeQualifiers(Sema &S, const DeclSpec &DS,
733 // If this occurs outside a template instantiation, warn the user about
734 // it; they probably didn't mean to specify a redundant qualifier.
735 typedef std::pair<DeclSpec::TQ, SourceLocation> QualLoc;
736 for (QualLoc Qual : {QualLoc(DeclSpec::TQ_const, DS.getConstSpecLoc()),
737 QualLoc(DeclSpec::TQ_restrict, DS.getRestrictSpecLoc()),
738 QualLoc(DeclSpec::TQ_volatile, DS.getVolatileSpecLoc()),
739 QualLoc(DeclSpec::TQ_atomic, DS.getAtomicSpecLoc())}) {
740 if (!(RemoveTQs & Qual.first))
743 if (!S.inTemplateInstantiation()) {
744 if (TypeQuals & Qual.first)
745 S.Diag(Qual.second, DiagID)
746 << DeclSpec::getSpecifierName(Qual.first) << TypeSoFar
747 << FixItHint::CreateRemoval(Qual.second);
750 TypeQuals &= ~Qual.first;
754 /// Return true if this is omitted block return type. Also check type
755 /// attributes and type qualifiers when returning true.
756 static bool checkOmittedBlockReturnType(Sema &S, Declarator &declarator,
758 if (!isOmittedBlockReturnType(declarator))
761 // Warn if we see type attributes for omitted return type on a block literal.
762 AttributeList *&attrs =
763 declarator.getMutableDeclSpec().getAttributes().getListRef();
764 AttributeList *prev = nullptr;
765 for (AttributeList *cur = attrs; cur; cur = cur->getNext()) {
766 AttributeList &attr = *cur;
767 // Skip attributes that were marked to be invalid or non-type
769 if (attr.isInvalid() || !attr.isTypeAttr()) {
773 S.Diag(attr.getLoc(),
774 diag::warn_block_literal_attributes_on_omitted_return_type)
776 // Remove cur from the list.
778 prev->setNext(cur->getNext());
781 attrs = cur->getNext();
785 // Warn if we see type qualifiers for omitted return type on a block literal.
786 const DeclSpec &DS = declarator.getDeclSpec();
787 unsigned TypeQuals = DS.getTypeQualifiers();
788 diagnoseAndRemoveTypeQualifiers(S, DS, TypeQuals, Result, (unsigned)-1,
789 diag::warn_block_literal_qualifiers_on_omitted_return_type);
790 declarator.getMutableDeclSpec().ClearTypeQualifiers();
795 /// Apply Objective-C type arguments to the given type.
796 static QualType applyObjCTypeArgs(Sema &S, SourceLocation loc, QualType type,
797 ArrayRef<TypeSourceInfo *> typeArgs,
798 SourceRange typeArgsRange,
799 bool failOnError = false) {
800 // We can only apply type arguments to an Objective-C class type.
801 const auto *objcObjectType = type->getAs<ObjCObjectType>();
802 if (!objcObjectType || !objcObjectType->getInterface()) {
803 S.Diag(loc, diag::err_objc_type_args_non_class)
812 // The class type must be parameterized.
813 ObjCInterfaceDecl *objcClass = objcObjectType->getInterface();
814 ObjCTypeParamList *typeParams = objcClass->getTypeParamList();
816 S.Diag(loc, diag::err_objc_type_args_non_parameterized_class)
817 << objcClass->getDeclName()
818 << FixItHint::CreateRemoval(typeArgsRange);
826 // The type must not already be specialized.
827 if (objcObjectType->isSpecialized()) {
828 S.Diag(loc, diag::err_objc_type_args_specialized_class)
830 << FixItHint::CreateRemoval(typeArgsRange);
838 // Check the type arguments.
839 SmallVector<QualType, 4> finalTypeArgs;
840 unsigned numTypeParams = typeParams->size();
841 bool anyPackExpansions = false;
842 for (unsigned i = 0, n = typeArgs.size(); i != n; ++i) {
843 TypeSourceInfo *typeArgInfo = typeArgs[i];
844 QualType typeArg = typeArgInfo->getType();
846 // Type arguments cannot have explicit qualifiers or nullability.
847 // We ignore indirect sources of these, e.g. behind typedefs or
848 // template arguments.
849 if (TypeLoc qual = typeArgInfo->getTypeLoc().findExplicitQualifierLoc()) {
850 bool diagnosed = false;
851 SourceRange rangeToRemove;
852 if (auto attr = qual.getAs<AttributedTypeLoc>()) {
853 rangeToRemove = attr.getLocalSourceRange();
854 if (attr.getTypePtr()->getImmediateNullability()) {
855 typeArg = attr.getTypePtr()->getModifiedType();
856 S.Diag(attr.getLocStart(),
857 diag::err_objc_type_arg_explicit_nullability)
858 << typeArg << FixItHint::CreateRemoval(rangeToRemove);
864 S.Diag(qual.getLocStart(), diag::err_objc_type_arg_qualified)
865 << typeArg << typeArg.getQualifiers().getAsString()
866 << FixItHint::CreateRemoval(rangeToRemove);
870 // Remove qualifiers even if they're non-local.
871 typeArg = typeArg.getUnqualifiedType();
873 finalTypeArgs.push_back(typeArg);
875 if (typeArg->getAs<PackExpansionType>())
876 anyPackExpansions = true;
878 // Find the corresponding type parameter, if there is one.
879 ObjCTypeParamDecl *typeParam = nullptr;
880 if (!anyPackExpansions) {
881 if (i < numTypeParams) {
882 typeParam = typeParams->begin()[i];
884 // Too many arguments.
885 S.Diag(loc, diag::err_objc_type_args_wrong_arity)
887 << objcClass->getDeclName()
888 << (unsigned)typeArgs.size()
890 S.Diag(objcClass->getLocation(), diag::note_previous_decl)
900 // Objective-C object pointer types must be substitutable for the bounds.
901 if (const auto *typeArgObjC = typeArg->getAs<ObjCObjectPointerType>()) {
902 // If we don't have a type parameter to match against, assume
903 // everything is fine. There was a prior pack expansion that
904 // means we won't be able to match anything.
906 assert(anyPackExpansions && "Too many arguments?");
910 // Retrieve the bound.
911 QualType bound = typeParam->getUnderlyingType();
912 const auto *boundObjC = bound->getAs<ObjCObjectPointerType>();
914 // Determine whether the type argument is substitutable for the bound.
915 if (typeArgObjC->isObjCIdType()) {
916 // When the type argument is 'id', the only acceptable type
917 // parameter bound is 'id'.
918 if (boundObjC->isObjCIdType())
920 } else if (S.Context.canAssignObjCInterfaces(boundObjC, typeArgObjC)) {
921 // Otherwise, we follow the assignability rules.
925 // Diagnose the mismatch.
926 S.Diag(typeArgInfo->getTypeLoc().getLocStart(),
927 diag::err_objc_type_arg_does_not_match_bound)
928 << typeArg << bound << typeParam->getDeclName();
929 S.Diag(typeParam->getLocation(), diag::note_objc_type_param_here)
930 << typeParam->getDeclName();
938 // Block pointer types are permitted for unqualified 'id' bounds.
939 if (typeArg->isBlockPointerType()) {
940 // If we don't have a type parameter to match against, assume
941 // everything is fine. There was a prior pack expansion that
942 // means we won't be able to match anything.
944 assert(anyPackExpansions && "Too many arguments?");
948 // Retrieve the bound.
949 QualType bound = typeParam->getUnderlyingType();
950 if (bound->isBlockCompatibleObjCPointerType(S.Context))
953 // Diagnose the mismatch.
954 S.Diag(typeArgInfo->getTypeLoc().getLocStart(),
955 diag::err_objc_type_arg_does_not_match_bound)
956 << typeArg << bound << typeParam->getDeclName();
957 S.Diag(typeParam->getLocation(), diag::note_objc_type_param_here)
958 << typeParam->getDeclName();
966 // Dependent types will be checked at instantiation time.
967 if (typeArg->isDependentType()) {
971 // Diagnose non-id-compatible type arguments.
972 S.Diag(typeArgInfo->getTypeLoc().getLocStart(),
973 diag::err_objc_type_arg_not_id_compatible)
975 << typeArgInfo->getTypeLoc().getSourceRange();
983 // Make sure we didn't have the wrong number of arguments.
984 if (!anyPackExpansions && finalTypeArgs.size() != numTypeParams) {
985 S.Diag(loc, diag::err_objc_type_args_wrong_arity)
986 << (typeArgs.size() < typeParams->size())
987 << objcClass->getDeclName()
988 << (unsigned)finalTypeArgs.size()
989 << (unsigned)numTypeParams;
990 S.Diag(objcClass->getLocation(), diag::note_previous_decl)
999 // Success. Form the specialized type.
1000 return S.Context.getObjCObjectType(type, finalTypeArgs, { }, false);
1003 QualType Sema::BuildObjCTypeParamType(const ObjCTypeParamDecl *Decl,
1004 SourceLocation ProtocolLAngleLoc,
1005 ArrayRef<ObjCProtocolDecl *> Protocols,
1006 ArrayRef<SourceLocation> ProtocolLocs,
1007 SourceLocation ProtocolRAngleLoc,
1009 QualType Result = QualType(Decl->getTypeForDecl(), 0);
1010 if (!Protocols.empty()) {
1012 Result = Context.applyObjCProtocolQualifiers(Result, Protocols,
1015 Diag(SourceLocation(), diag::err_invalid_protocol_qualifiers)
1016 << SourceRange(ProtocolLAngleLoc, ProtocolRAngleLoc);
1017 if (FailOnError) Result = QualType();
1019 if (FailOnError && Result.isNull())
1026 QualType Sema::BuildObjCObjectType(QualType BaseType,
1028 SourceLocation TypeArgsLAngleLoc,
1029 ArrayRef<TypeSourceInfo *> TypeArgs,
1030 SourceLocation TypeArgsRAngleLoc,
1031 SourceLocation ProtocolLAngleLoc,
1032 ArrayRef<ObjCProtocolDecl *> Protocols,
1033 ArrayRef<SourceLocation> ProtocolLocs,
1034 SourceLocation ProtocolRAngleLoc,
1036 QualType Result = BaseType;
1037 if (!TypeArgs.empty()) {
1038 Result = applyObjCTypeArgs(*this, Loc, Result, TypeArgs,
1039 SourceRange(TypeArgsLAngleLoc,
1042 if (FailOnError && Result.isNull())
1046 if (!Protocols.empty()) {
1048 Result = Context.applyObjCProtocolQualifiers(Result, Protocols,
1051 Diag(Loc, diag::err_invalid_protocol_qualifiers)
1052 << SourceRange(ProtocolLAngleLoc, ProtocolRAngleLoc);
1053 if (FailOnError) Result = QualType();
1055 if (FailOnError && Result.isNull())
1062 TypeResult Sema::actOnObjCProtocolQualifierType(
1063 SourceLocation lAngleLoc,
1064 ArrayRef<Decl *> protocols,
1065 ArrayRef<SourceLocation> protocolLocs,
1066 SourceLocation rAngleLoc) {
1067 // Form id<protocol-list>.
1068 QualType Result = Context.getObjCObjectType(
1069 Context.ObjCBuiltinIdTy, { },
1071 (ObjCProtocolDecl * const *)protocols.data(),
1074 Result = Context.getObjCObjectPointerType(Result);
1076 TypeSourceInfo *ResultTInfo = Context.CreateTypeSourceInfo(Result);
1077 TypeLoc ResultTL = ResultTInfo->getTypeLoc();
1079 auto ObjCObjectPointerTL = ResultTL.castAs<ObjCObjectPointerTypeLoc>();
1080 ObjCObjectPointerTL.setStarLoc(SourceLocation()); // implicit
1082 auto ObjCObjectTL = ObjCObjectPointerTL.getPointeeLoc()
1083 .castAs<ObjCObjectTypeLoc>();
1084 ObjCObjectTL.setHasBaseTypeAsWritten(false);
1085 ObjCObjectTL.getBaseLoc().initialize(Context, SourceLocation());
1087 // No type arguments.
1088 ObjCObjectTL.setTypeArgsLAngleLoc(SourceLocation());
1089 ObjCObjectTL.setTypeArgsRAngleLoc(SourceLocation());
1091 // Fill in protocol qualifiers.
1092 ObjCObjectTL.setProtocolLAngleLoc(lAngleLoc);
1093 ObjCObjectTL.setProtocolRAngleLoc(rAngleLoc);
1094 for (unsigned i = 0, n = protocols.size(); i != n; ++i)
1095 ObjCObjectTL.setProtocolLoc(i, protocolLocs[i]);
1097 // We're done. Return the completed type to the parser.
1098 return CreateParsedType(Result, ResultTInfo);
1101 TypeResult Sema::actOnObjCTypeArgsAndProtocolQualifiers(
1104 ParsedType BaseType,
1105 SourceLocation TypeArgsLAngleLoc,
1106 ArrayRef<ParsedType> TypeArgs,
1107 SourceLocation TypeArgsRAngleLoc,
1108 SourceLocation ProtocolLAngleLoc,
1109 ArrayRef<Decl *> Protocols,
1110 ArrayRef<SourceLocation> ProtocolLocs,
1111 SourceLocation ProtocolRAngleLoc) {
1112 TypeSourceInfo *BaseTypeInfo = nullptr;
1113 QualType T = GetTypeFromParser(BaseType, &BaseTypeInfo);
1117 // Handle missing type-source info.
1119 BaseTypeInfo = Context.getTrivialTypeSourceInfo(T, Loc);
1121 // Extract type arguments.
1122 SmallVector<TypeSourceInfo *, 4> ActualTypeArgInfos;
1123 for (unsigned i = 0, n = TypeArgs.size(); i != n; ++i) {
1124 TypeSourceInfo *TypeArgInfo = nullptr;
1125 QualType TypeArg = GetTypeFromParser(TypeArgs[i], &TypeArgInfo);
1126 if (TypeArg.isNull()) {
1127 ActualTypeArgInfos.clear();
1131 assert(TypeArgInfo && "No type source info?");
1132 ActualTypeArgInfos.push_back(TypeArgInfo);
1135 // Build the object type.
1136 QualType Result = BuildObjCObjectType(
1137 T, BaseTypeInfo->getTypeLoc().getSourceRange().getBegin(),
1138 TypeArgsLAngleLoc, ActualTypeArgInfos, TypeArgsRAngleLoc,
1140 llvm::makeArrayRef((ObjCProtocolDecl * const *)Protocols.data(),
1142 ProtocolLocs, ProtocolRAngleLoc,
1143 /*FailOnError=*/false);
1148 // Create source information for this type.
1149 TypeSourceInfo *ResultTInfo = Context.CreateTypeSourceInfo(Result);
1150 TypeLoc ResultTL = ResultTInfo->getTypeLoc();
1152 // For id<Proto1, Proto2> or Class<Proto1, Proto2>, we'll have an
1153 // object pointer type. Fill in source information for it.
1154 if (auto ObjCObjectPointerTL = ResultTL.getAs<ObjCObjectPointerTypeLoc>()) {
1155 // The '*' is implicit.
1156 ObjCObjectPointerTL.setStarLoc(SourceLocation());
1157 ResultTL = ObjCObjectPointerTL.getPointeeLoc();
1160 if (auto OTPTL = ResultTL.getAs<ObjCTypeParamTypeLoc>()) {
1161 // Protocol qualifier information.
1162 if (OTPTL.getNumProtocols() > 0) {
1163 assert(OTPTL.getNumProtocols() == Protocols.size());
1164 OTPTL.setProtocolLAngleLoc(ProtocolLAngleLoc);
1165 OTPTL.setProtocolRAngleLoc(ProtocolRAngleLoc);
1166 for (unsigned i = 0, n = Protocols.size(); i != n; ++i)
1167 OTPTL.setProtocolLoc(i, ProtocolLocs[i]);
1170 // We're done. Return the completed type to the parser.
1171 return CreateParsedType(Result, ResultTInfo);
1174 auto ObjCObjectTL = ResultTL.castAs<ObjCObjectTypeLoc>();
1176 // Type argument information.
1177 if (ObjCObjectTL.getNumTypeArgs() > 0) {
1178 assert(ObjCObjectTL.getNumTypeArgs() == ActualTypeArgInfos.size());
1179 ObjCObjectTL.setTypeArgsLAngleLoc(TypeArgsLAngleLoc);
1180 ObjCObjectTL.setTypeArgsRAngleLoc(TypeArgsRAngleLoc);
1181 for (unsigned i = 0, n = ActualTypeArgInfos.size(); i != n; ++i)
1182 ObjCObjectTL.setTypeArgTInfo(i, ActualTypeArgInfos[i]);
1184 ObjCObjectTL.setTypeArgsLAngleLoc(SourceLocation());
1185 ObjCObjectTL.setTypeArgsRAngleLoc(SourceLocation());
1188 // Protocol qualifier information.
1189 if (ObjCObjectTL.getNumProtocols() > 0) {
1190 assert(ObjCObjectTL.getNumProtocols() == Protocols.size());
1191 ObjCObjectTL.setProtocolLAngleLoc(ProtocolLAngleLoc);
1192 ObjCObjectTL.setProtocolRAngleLoc(ProtocolRAngleLoc);
1193 for (unsigned i = 0, n = Protocols.size(); i != n; ++i)
1194 ObjCObjectTL.setProtocolLoc(i, ProtocolLocs[i]);
1196 ObjCObjectTL.setProtocolLAngleLoc(SourceLocation());
1197 ObjCObjectTL.setProtocolRAngleLoc(SourceLocation());
1201 ObjCObjectTL.setHasBaseTypeAsWritten(true);
1202 if (ObjCObjectTL.getType() == T)
1203 ObjCObjectTL.getBaseLoc().initializeFullCopy(BaseTypeInfo->getTypeLoc());
1205 ObjCObjectTL.getBaseLoc().initialize(Context, Loc);
1207 // We're done. Return the completed type to the parser.
1208 return CreateParsedType(Result, ResultTInfo);
1211 static OpenCLAccessAttr::Spelling getImageAccess(const AttributeList *Attrs) {
1213 const AttributeList *Next = Attrs;
1215 const AttributeList &Attr = *Next;
1216 Next = Attr.getNext();
1217 if (Attr.getKind() == AttributeList::AT_OpenCLAccess) {
1218 return static_cast<OpenCLAccessAttr::Spelling>(
1219 Attr.getSemanticSpelling());
1223 return OpenCLAccessAttr::Keyword_read_only;
1226 /// \brief Convert the specified declspec to the appropriate type
1228 /// \param state Specifies the declarator containing the declaration specifier
1229 /// to be converted, along with other associated processing state.
1230 /// \returns The type described by the declaration specifiers. This function
1231 /// never returns null.
1232 static QualType ConvertDeclSpecToType(TypeProcessingState &state) {
1233 // FIXME: Should move the logic from DeclSpec::Finish to here for validity
1236 Sema &S = state.getSema();
1237 Declarator &declarator = state.getDeclarator();
1238 const DeclSpec &DS = declarator.getDeclSpec();
1239 SourceLocation DeclLoc = declarator.getIdentifierLoc();
1240 if (DeclLoc.isInvalid())
1241 DeclLoc = DS.getLocStart();
1243 ASTContext &Context = S.Context;
1246 switch (DS.getTypeSpecType()) {
1247 case DeclSpec::TST_void:
1248 Result = Context.VoidTy;
1250 case DeclSpec::TST_char:
1251 if (DS.getTypeSpecSign() == DeclSpec::TSS_unspecified)
1252 Result = Context.CharTy;
1253 else if (DS.getTypeSpecSign() == DeclSpec::TSS_signed)
1254 Result = Context.SignedCharTy;
1256 assert(DS.getTypeSpecSign() == DeclSpec::TSS_unsigned &&
1257 "Unknown TSS value");
1258 Result = Context.UnsignedCharTy;
1261 case DeclSpec::TST_wchar:
1262 if (DS.getTypeSpecSign() == DeclSpec::TSS_unspecified)
1263 Result = Context.WCharTy;
1264 else if (DS.getTypeSpecSign() == DeclSpec::TSS_signed) {
1265 S.Diag(DS.getTypeSpecSignLoc(), diag::ext_invalid_sign_spec)
1266 << DS.getSpecifierName(DS.getTypeSpecType(),
1267 Context.getPrintingPolicy());
1268 Result = Context.getSignedWCharType();
1270 assert(DS.getTypeSpecSign() == DeclSpec::TSS_unsigned &&
1271 "Unknown TSS value");
1272 S.Diag(DS.getTypeSpecSignLoc(), diag::ext_invalid_sign_spec)
1273 << DS.getSpecifierName(DS.getTypeSpecType(),
1274 Context.getPrintingPolicy());
1275 Result = Context.getUnsignedWCharType();
1278 case DeclSpec::TST_char16:
1279 assert(DS.getTypeSpecSign() == DeclSpec::TSS_unspecified &&
1280 "Unknown TSS value");
1281 Result = Context.Char16Ty;
1283 case DeclSpec::TST_char32:
1284 assert(DS.getTypeSpecSign() == DeclSpec::TSS_unspecified &&
1285 "Unknown TSS value");
1286 Result = Context.Char32Ty;
1288 case DeclSpec::TST_unspecified:
1289 // If this is a missing declspec in a block literal return context, then it
1290 // is inferred from the return statements inside the block.
1291 // The declspec is always missing in a lambda expr context; it is either
1292 // specified with a trailing return type or inferred.
1293 if (S.getLangOpts().CPlusPlus14 &&
1294 declarator.getContext() == Declarator::LambdaExprContext) {
1295 // In C++1y, a lambda's implicit return type is 'auto'.
1296 Result = Context.getAutoDeductType();
1298 } else if (declarator.getContext() == Declarator::LambdaExprContext ||
1299 checkOmittedBlockReturnType(S, declarator,
1300 Context.DependentTy)) {
1301 Result = Context.DependentTy;
1305 // Unspecified typespec defaults to int in C90. However, the C90 grammar
1306 // [C90 6.5] only allows a decl-spec if there was *some* type-specifier,
1307 // type-qualifier, or storage-class-specifier. If not, emit an extwarn.
1308 // Note that the one exception to this is function definitions, which are
1309 // allowed to be completely missing a declspec. This is handled in the
1310 // parser already though by it pretending to have seen an 'int' in this
1312 if (S.getLangOpts().ImplicitInt) {
1313 // In C89 mode, we only warn if there is a completely missing declspec
1314 // when one is not allowed.
1316 S.Diag(DeclLoc, diag::ext_missing_declspec)
1317 << DS.getSourceRange()
1318 << FixItHint::CreateInsertion(DS.getLocStart(), "int");
1320 } else if (!DS.hasTypeSpecifier()) {
1321 // C99 and C++ require a type specifier. For example, C99 6.7.2p2 says:
1322 // "At least one type specifier shall be given in the declaration
1323 // specifiers in each declaration, and in the specifier-qualifier list in
1324 // each struct declaration and type name."
1325 if (S.getLangOpts().CPlusPlus) {
1326 S.Diag(DeclLoc, diag::err_missing_type_specifier)
1327 << DS.getSourceRange();
1329 // When this occurs in C++ code, often something is very broken with the
1330 // value being declared, poison it as invalid so we don't get chains of
1332 declarator.setInvalidType(true);
1333 } else if (S.getLangOpts().OpenCLVersion >= 200 && DS.isTypeSpecPipe()){
1334 S.Diag(DeclLoc, diag::err_missing_actual_pipe_type)
1335 << DS.getSourceRange();
1336 declarator.setInvalidType(true);
1338 S.Diag(DeclLoc, diag::ext_missing_type_specifier)
1339 << DS.getSourceRange();
1344 case DeclSpec::TST_int: {
1345 if (DS.getTypeSpecSign() != DeclSpec::TSS_unsigned) {
1346 switch (DS.getTypeSpecWidth()) {
1347 case DeclSpec::TSW_unspecified: Result = Context.IntTy; break;
1348 case DeclSpec::TSW_short: Result = Context.ShortTy; break;
1349 case DeclSpec::TSW_long: Result = Context.LongTy; break;
1350 case DeclSpec::TSW_longlong:
1351 Result = Context.LongLongTy;
1353 // 'long long' is a C99 or C++11 feature.
1354 if (!S.getLangOpts().C99) {
1355 if (S.getLangOpts().CPlusPlus)
1356 S.Diag(DS.getTypeSpecWidthLoc(),
1357 S.getLangOpts().CPlusPlus11 ?
1358 diag::warn_cxx98_compat_longlong : diag::ext_cxx11_longlong);
1360 S.Diag(DS.getTypeSpecWidthLoc(), diag::ext_c99_longlong);
1365 switch (DS.getTypeSpecWidth()) {
1366 case DeclSpec::TSW_unspecified: Result = Context.UnsignedIntTy; break;
1367 case DeclSpec::TSW_short: Result = Context.UnsignedShortTy; break;
1368 case DeclSpec::TSW_long: Result = Context.UnsignedLongTy; break;
1369 case DeclSpec::TSW_longlong:
1370 Result = Context.UnsignedLongLongTy;
1372 // 'long long' is a C99 or C++11 feature.
1373 if (!S.getLangOpts().C99) {
1374 if (S.getLangOpts().CPlusPlus)
1375 S.Diag(DS.getTypeSpecWidthLoc(),
1376 S.getLangOpts().CPlusPlus11 ?
1377 diag::warn_cxx98_compat_longlong : diag::ext_cxx11_longlong);
1379 S.Diag(DS.getTypeSpecWidthLoc(), diag::ext_c99_longlong);
1386 case DeclSpec::TST_int128:
1387 if (!S.Context.getTargetInfo().hasInt128Type())
1388 S.Diag(DS.getTypeSpecTypeLoc(), diag::err_type_unsupported)
1390 if (DS.getTypeSpecSign() == DeclSpec::TSS_unsigned)
1391 Result = Context.UnsignedInt128Ty;
1393 Result = Context.Int128Ty;
1395 case DeclSpec::TST_half: Result = Context.HalfTy; break;
1396 case DeclSpec::TST_float: Result = Context.FloatTy; break;
1397 case DeclSpec::TST_double:
1398 if (DS.getTypeSpecWidth() == DeclSpec::TSW_long)
1399 Result = Context.LongDoubleTy;
1401 Result = Context.DoubleTy;
1403 case DeclSpec::TST_float128:
1404 if (!S.Context.getTargetInfo().hasFloat128Type())
1405 S.Diag(DS.getTypeSpecTypeLoc(), diag::err_type_unsupported)
1407 Result = Context.Float128Ty;
1409 case DeclSpec::TST_bool: Result = Context.BoolTy; break; // _Bool or bool
1411 case DeclSpec::TST_decimal32: // _Decimal32
1412 case DeclSpec::TST_decimal64: // _Decimal64
1413 case DeclSpec::TST_decimal128: // _Decimal128
1414 S.Diag(DS.getTypeSpecTypeLoc(), diag::err_decimal_unsupported);
1415 Result = Context.IntTy;
1416 declarator.setInvalidType(true);
1418 case DeclSpec::TST_class:
1419 case DeclSpec::TST_enum:
1420 case DeclSpec::TST_union:
1421 case DeclSpec::TST_struct:
1422 case DeclSpec::TST_interface: {
1423 TypeDecl *D = dyn_cast_or_null<TypeDecl>(DS.getRepAsDecl());
1425 // This can happen in C++ with ambiguous lookups.
1426 Result = Context.IntTy;
1427 declarator.setInvalidType(true);
1431 // If the type is deprecated or unavailable, diagnose it.
1432 S.DiagnoseUseOfDecl(D, DS.getTypeSpecTypeNameLoc());
1434 assert(DS.getTypeSpecWidth() == 0 && DS.getTypeSpecComplex() == 0 &&
1435 DS.getTypeSpecSign() == 0 && "No qualifiers on tag names!");
1437 // TypeQuals handled by caller.
1438 Result = Context.getTypeDeclType(D);
1440 // In both C and C++, make an ElaboratedType.
1441 ElaboratedTypeKeyword Keyword
1442 = ElaboratedType::getKeywordForTypeSpec(DS.getTypeSpecType());
1443 Result = S.getElaboratedType(Keyword, DS.getTypeSpecScope(), Result);
1446 case DeclSpec::TST_typename: {
1447 assert(DS.getTypeSpecWidth() == 0 && DS.getTypeSpecComplex() == 0 &&
1448 DS.getTypeSpecSign() == 0 &&
1449 "Can't handle qualifiers on typedef names yet!");
1450 Result = S.GetTypeFromParser(DS.getRepAsType());
1451 if (Result.isNull()) {
1452 declarator.setInvalidType(true);
1455 // TypeQuals handled by caller.
1458 case DeclSpec::TST_typeofType:
1459 // FIXME: Preserve type source info.
1460 Result = S.GetTypeFromParser(DS.getRepAsType());
1461 assert(!Result.isNull() && "Didn't get a type for typeof?");
1462 if (!Result->isDependentType())
1463 if (const TagType *TT = Result->getAs<TagType>())
1464 S.DiagnoseUseOfDecl(TT->getDecl(), DS.getTypeSpecTypeLoc());
1465 // TypeQuals handled by caller.
1466 Result = Context.getTypeOfType(Result);
1468 case DeclSpec::TST_typeofExpr: {
1469 Expr *E = DS.getRepAsExpr();
1470 assert(E && "Didn't get an expression for typeof?");
1471 // TypeQuals handled by caller.
1472 Result = S.BuildTypeofExprType(E, DS.getTypeSpecTypeLoc());
1473 if (Result.isNull()) {
1474 Result = Context.IntTy;
1475 declarator.setInvalidType(true);
1479 case DeclSpec::TST_decltype: {
1480 Expr *E = DS.getRepAsExpr();
1481 assert(E && "Didn't get an expression for decltype?");
1482 // TypeQuals handled by caller.
1483 Result = S.BuildDecltypeType(E, DS.getTypeSpecTypeLoc());
1484 if (Result.isNull()) {
1485 Result = Context.IntTy;
1486 declarator.setInvalidType(true);
1490 case DeclSpec::TST_underlyingType:
1491 Result = S.GetTypeFromParser(DS.getRepAsType());
1492 assert(!Result.isNull() && "Didn't get a type for __underlying_type?");
1493 Result = S.BuildUnaryTransformType(Result,
1494 UnaryTransformType::EnumUnderlyingType,
1495 DS.getTypeSpecTypeLoc());
1496 if (Result.isNull()) {
1497 Result = Context.IntTy;
1498 declarator.setInvalidType(true);
1502 case DeclSpec::TST_auto:
1503 Result = Context.getAutoType(QualType(), AutoTypeKeyword::Auto, false);
1506 case DeclSpec::TST_auto_type:
1507 Result = Context.getAutoType(QualType(), AutoTypeKeyword::GNUAutoType, false);
1510 case DeclSpec::TST_decltype_auto:
1511 Result = Context.getAutoType(QualType(), AutoTypeKeyword::DecltypeAuto,
1512 /*IsDependent*/ false);
1515 case DeclSpec::TST_unknown_anytype:
1516 Result = Context.UnknownAnyTy;
1519 case DeclSpec::TST_atomic:
1520 Result = S.GetTypeFromParser(DS.getRepAsType());
1521 assert(!Result.isNull() && "Didn't get a type for _Atomic?");
1522 Result = S.BuildAtomicType(Result, DS.getTypeSpecTypeLoc());
1523 if (Result.isNull()) {
1524 Result = Context.IntTy;
1525 declarator.setInvalidType(true);
1529 #define GENERIC_IMAGE_TYPE(ImgType, Id) \
1530 case DeclSpec::TST_##ImgType##_t: \
1531 switch (getImageAccess(DS.getAttributes().getList())) { \
1532 case OpenCLAccessAttr::Keyword_write_only: \
1533 Result = Context.Id##WOTy; break; \
1534 case OpenCLAccessAttr::Keyword_read_write: \
1535 Result = Context.Id##RWTy; break; \
1536 case OpenCLAccessAttr::Keyword_read_only: \
1537 Result = Context.Id##ROTy; break; \
1540 #include "clang/Basic/OpenCLImageTypes.def"
1542 case DeclSpec::TST_error:
1543 Result = Context.IntTy;
1544 declarator.setInvalidType(true);
1548 if (S.getLangOpts().OpenCL &&
1549 S.checkOpenCLDisabledTypeDeclSpec(DS, Result))
1550 declarator.setInvalidType(true);
1552 // Handle complex types.
1553 if (DS.getTypeSpecComplex() == DeclSpec::TSC_complex) {
1554 if (S.getLangOpts().Freestanding)
1555 S.Diag(DS.getTypeSpecComplexLoc(), diag::ext_freestanding_complex);
1556 Result = Context.getComplexType(Result);
1557 } else if (DS.isTypeAltiVecVector()) {
1558 unsigned typeSize = static_cast<unsigned>(Context.getTypeSize(Result));
1559 assert(typeSize > 0 && "type size for vector must be greater than 0 bits");
1560 VectorType::VectorKind VecKind = VectorType::AltiVecVector;
1561 if (DS.isTypeAltiVecPixel())
1562 VecKind = VectorType::AltiVecPixel;
1563 else if (DS.isTypeAltiVecBool())
1564 VecKind = VectorType::AltiVecBool;
1565 Result = Context.getVectorType(Result, 128/typeSize, VecKind);
1568 // FIXME: Imaginary.
1569 if (DS.getTypeSpecComplex() == DeclSpec::TSC_imaginary)
1570 S.Diag(DS.getTypeSpecComplexLoc(), diag::err_imaginary_not_supported);
1572 // Before we process any type attributes, synthesize a block literal
1573 // function declarator if necessary.
1574 if (declarator.getContext() == Declarator::BlockLiteralContext)
1575 maybeSynthesizeBlockSignature(state, Result);
1577 // Apply any type attributes from the decl spec. This may cause the
1578 // list of type attributes to be temporarily saved while the type
1579 // attributes are pushed around.
1580 // pipe attributes will be handled later ( at GetFullTypeForDeclarator )
1581 if (!DS.isTypeSpecPipe())
1582 processTypeAttrs(state, Result, TAL_DeclSpec, DS.getAttributes().getList());
1584 // Apply const/volatile/restrict qualifiers to T.
1585 if (unsigned TypeQuals = DS.getTypeQualifiers()) {
1586 // Warn about CV qualifiers on function types.
1588 // If the specification of a function type includes any type qualifiers,
1589 // the behavior is undefined.
1590 // C++11 [dcl.fct]p7:
1591 // The effect of a cv-qualifier-seq in a function declarator is not the
1592 // same as adding cv-qualification on top of the function type. In the
1593 // latter case, the cv-qualifiers are ignored.
1594 if (TypeQuals && Result->isFunctionType()) {
1595 diagnoseAndRemoveTypeQualifiers(
1596 S, DS, TypeQuals, Result, DeclSpec::TQ_const | DeclSpec::TQ_volatile,
1597 S.getLangOpts().CPlusPlus
1598 ? diag::warn_typecheck_function_qualifiers_ignored
1599 : diag::warn_typecheck_function_qualifiers_unspecified);
1600 // No diagnostic for 'restrict' or '_Atomic' applied to a
1601 // function type; we'll diagnose those later, in BuildQualifiedType.
1604 // C++11 [dcl.ref]p1:
1605 // Cv-qualified references are ill-formed except when the
1606 // cv-qualifiers are introduced through the use of a typedef-name
1607 // or decltype-specifier, in which case the cv-qualifiers are ignored.
1609 // There don't appear to be any other contexts in which a cv-qualified
1610 // reference type could be formed, so the 'ill-formed' clause here appears
1612 if (TypeQuals && Result->isReferenceType()) {
1613 diagnoseAndRemoveTypeQualifiers(
1614 S, DS, TypeQuals, Result,
1615 DeclSpec::TQ_const | DeclSpec::TQ_volatile | DeclSpec::TQ_atomic,
1616 diag::warn_typecheck_reference_qualifiers);
1619 // C90 6.5.3 constraints: "The same type qualifier shall not appear more
1620 // than once in the same specifier-list or qualifier-list, either directly
1621 // or via one or more typedefs."
1622 if (!S.getLangOpts().C99 && !S.getLangOpts().CPlusPlus
1623 && TypeQuals & Result.getCVRQualifiers()) {
1624 if (TypeQuals & DeclSpec::TQ_const && Result.isConstQualified()) {
1625 S.Diag(DS.getConstSpecLoc(), diag::ext_duplicate_declspec)
1629 if (TypeQuals & DeclSpec::TQ_volatile && Result.isVolatileQualified()) {
1630 S.Diag(DS.getVolatileSpecLoc(), diag::ext_duplicate_declspec)
1634 // C90 doesn't have restrict nor _Atomic, so it doesn't force us to
1635 // produce a warning in this case.
1638 QualType Qualified = S.BuildQualifiedType(Result, DeclLoc, TypeQuals, &DS);
1640 // If adding qualifiers fails, just use the unqualified type.
1641 if (Qualified.isNull())
1642 declarator.setInvalidType(true);
1647 assert(!Result.isNull() && "This function should not return a null type");
1651 static std::string getPrintableNameForEntity(DeclarationName Entity) {
1653 return Entity.getAsString();
1658 QualType Sema::BuildQualifiedType(QualType T, SourceLocation Loc,
1659 Qualifiers Qs, const DeclSpec *DS) {
1663 // Ignore any attempt to form a cv-qualified reference.
1664 if (T->isReferenceType()) {
1666 Qs.removeVolatile();
1669 // Enforce C99 6.7.3p2: "Types other than pointer types derived from
1670 // object or incomplete types shall not be restrict-qualified."
1671 if (Qs.hasRestrict()) {
1672 unsigned DiagID = 0;
1675 if (T->isAnyPointerType() || T->isReferenceType() ||
1676 T->isMemberPointerType()) {
1678 if (T->isObjCObjectPointerType())
1680 else if (const MemberPointerType *PTy = T->getAs<MemberPointerType>())
1681 EltTy = PTy->getPointeeType();
1683 EltTy = T->getPointeeType();
1685 // If we have a pointer or reference, the pointee must have an object
1687 if (!EltTy->isIncompleteOrObjectType()) {
1688 DiagID = diag::err_typecheck_invalid_restrict_invalid_pointee;
1691 } else if (!T->isDependentType()) {
1692 DiagID = diag::err_typecheck_invalid_restrict_not_pointer;
1697 Diag(DS ? DS->getRestrictSpecLoc() : Loc, DiagID) << ProblemTy;
1698 Qs.removeRestrict();
1702 return Context.getQualifiedType(T, Qs);
1705 QualType Sema::BuildQualifiedType(QualType T, SourceLocation Loc,
1706 unsigned CVRAU, const DeclSpec *DS) {
1710 // Ignore any attempt to form a cv-qualified reference.
1711 if (T->isReferenceType())
1713 ~(DeclSpec::TQ_const | DeclSpec::TQ_volatile | DeclSpec::TQ_atomic);
1715 // Convert from DeclSpec::TQ to Qualifiers::TQ by just dropping TQ_atomic and
1717 unsigned CVR = CVRAU & ~(DeclSpec::TQ_atomic | DeclSpec::TQ_unaligned);
1720 // If the same qualifier appears more than once in the same
1721 // specifier-qualifier-list, either directly or via one or more typedefs,
1722 // the behavior is the same as if it appeared only once.
1724 // It's not specified what happens when the _Atomic qualifier is applied to
1725 // a type specified with the _Atomic specifier, but we assume that this
1726 // should be treated as if the _Atomic qualifier appeared multiple times.
1727 if (CVRAU & DeclSpec::TQ_atomic && !T->isAtomicType()) {
1729 // If other qualifiers appear along with the _Atomic qualifier in a
1730 // specifier-qualifier-list, the resulting type is the so-qualified
1733 // Don't need to worry about array types here, since _Atomic can't be
1734 // applied to such types.
1735 SplitQualType Split = T.getSplitUnqualifiedType();
1736 T = BuildAtomicType(QualType(Split.Ty, 0),
1737 DS ? DS->getAtomicSpecLoc() : Loc);
1740 Split.Quals.addCVRQualifiers(CVR);
1741 return BuildQualifiedType(T, Loc, Split.Quals);
1744 Qualifiers Q = Qualifiers::fromCVRMask(CVR);
1745 Q.setUnaligned(CVRAU & DeclSpec::TQ_unaligned);
1746 return BuildQualifiedType(T, Loc, Q, DS);
1749 /// \brief Build a paren type including \p T.
1750 QualType Sema::BuildParenType(QualType T) {
1751 return Context.getParenType(T);
1754 /// Given that we're building a pointer or reference to the given
1755 static QualType inferARCLifetimeForPointee(Sema &S, QualType type,
1758 // Bail out if retention is unrequired or already specified.
1759 if (!type->isObjCLifetimeType() ||
1760 type.getObjCLifetime() != Qualifiers::OCL_None)
1763 Qualifiers::ObjCLifetime implicitLifetime = Qualifiers::OCL_None;
1765 // If the object type is const-qualified, we can safely use
1766 // __unsafe_unretained. This is safe (because there are no read
1767 // barriers), and it'll be safe to coerce anything but __weak* to
1768 // the resulting type.
1769 if (type.isConstQualified()) {
1770 implicitLifetime = Qualifiers::OCL_ExplicitNone;
1772 // Otherwise, check whether the static type does not require
1773 // retaining. This currently only triggers for Class (possibly
1774 // protocol-qualifed, and arrays thereof).
1775 } else if (type->isObjCARCImplicitlyUnretainedType()) {
1776 implicitLifetime = Qualifiers::OCL_ExplicitNone;
1778 // If we are in an unevaluated context, like sizeof, skip adding a
1780 } else if (S.isUnevaluatedContext()) {
1783 // If that failed, give an error and recover using __strong. __strong
1784 // is the option most likely to prevent spurious second-order diagnostics,
1785 // like when binding a reference to a field.
1787 // These types can show up in private ivars in system headers, so
1788 // we need this to not be an error in those cases. Instead we
1790 if (S.DelayedDiagnostics.shouldDelayDiagnostics()) {
1791 S.DelayedDiagnostics.add(
1792 sema::DelayedDiagnostic::makeForbiddenType(loc,
1793 diag::err_arc_indirect_no_ownership, type, isReference));
1795 S.Diag(loc, diag::err_arc_indirect_no_ownership) << type << isReference;
1797 implicitLifetime = Qualifiers::OCL_Strong;
1799 assert(implicitLifetime && "didn't infer any lifetime!");
1802 qs.addObjCLifetime(implicitLifetime);
1803 return S.Context.getQualifiedType(type, qs);
1806 static std::string getFunctionQualifiersAsString(const FunctionProtoType *FnTy){
1808 Qualifiers::fromCVRMask(FnTy->getTypeQuals()).getAsString();
1810 switch (FnTy->getRefQualifier()) {
1831 /// Kinds of declarator that cannot contain a qualified function type.
1833 /// C++98 [dcl.fct]p4 / C++11 [dcl.fct]p6:
1834 /// a function type with a cv-qualifier or a ref-qualifier can only appear
1835 /// at the topmost level of a type.
1837 /// Parens and member pointers are permitted. We don't diagnose array and
1838 /// function declarators, because they don't allow function types at all.
1840 /// The values of this enum are used in diagnostics.
1841 enum QualifiedFunctionKind { QFK_BlockPointer, QFK_Pointer, QFK_Reference };
1842 } // end anonymous namespace
1844 /// Check whether the type T is a qualified function type, and if it is,
1845 /// diagnose that it cannot be contained within the given kind of declarator.
1846 static bool checkQualifiedFunction(Sema &S, QualType T, SourceLocation Loc,
1847 QualifiedFunctionKind QFK) {
1848 // Does T refer to a function type with a cv-qualifier or a ref-qualifier?
1849 const FunctionProtoType *FPT = T->getAs<FunctionProtoType>();
1850 if (!FPT || (FPT->getTypeQuals() == 0 && FPT->getRefQualifier() == RQ_None))
1853 S.Diag(Loc, diag::err_compound_qualified_function_type)
1854 << QFK << isa<FunctionType>(T.IgnoreParens()) << T
1855 << getFunctionQualifiersAsString(FPT);
1859 /// \brief Build a pointer type.
1861 /// \param T The type to which we'll be building a pointer.
1863 /// \param Loc The location of the entity whose type involves this
1864 /// pointer type or, if there is no such entity, the location of the
1865 /// type that will have pointer type.
1867 /// \param Entity The name of the entity that involves the pointer
1870 /// \returns A suitable pointer type, if there are no
1871 /// errors. Otherwise, returns a NULL type.
1872 QualType Sema::BuildPointerType(QualType T,
1873 SourceLocation Loc, DeclarationName Entity) {
1874 if (T->isReferenceType()) {
1875 // C++ 8.3.2p4: There shall be no ... pointers to references ...
1876 Diag(Loc, diag::err_illegal_decl_pointer_to_reference)
1877 << getPrintableNameForEntity(Entity) << T;
1881 if (T->isFunctionType() && getLangOpts().OpenCL) {
1882 Diag(Loc, diag::err_opencl_function_pointer);
1886 if (checkQualifiedFunction(*this, T, Loc, QFK_Pointer))
1889 assert(!T->isObjCObjectType() && "Should build ObjCObjectPointerType");
1891 // In ARC, it is forbidden to build pointers to unqualified pointers.
1892 if (getLangOpts().ObjCAutoRefCount)
1893 T = inferARCLifetimeForPointee(*this, T, Loc, /*reference*/ false);
1895 // Build the pointer type.
1896 return Context.getPointerType(T);
1899 /// \brief Build a reference type.
1901 /// \param T The type to which we'll be building a reference.
1903 /// \param Loc The location of the entity whose type involves this
1904 /// reference type or, if there is no such entity, the location of the
1905 /// type that will have reference type.
1907 /// \param Entity The name of the entity that involves the reference
1910 /// \returns A suitable reference type, if there are no
1911 /// errors. Otherwise, returns a NULL type.
1912 QualType Sema::BuildReferenceType(QualType T, bool SpelledAsLValue,
1914 DeclarationName Entity) {
1915 assert(Context.getCanonicalType(T) != Context.OverloadTy &&
1916 "Unresolved overloaded function type");
1918 // C++0x [dcl.ref]p6:
1919 // If a typedef (7.1.3), a type template-parameter (14.3.1), or a
1920 // decltype-specifier (7.1.6.2) denotes a type TR that is a reference to a
1921 // type T, an attempt to create the type "lvalue reference to cv TR" creates
1922 // the type "lvalue reference to T", while an attempt to create the type
1923 // "rvalue reference to cv TR" creates the type TR.
1924 bool LValueRef = SpelledAsLValue || T->getAs<LValueReferenceType>();
1926 // C++ [dcl.ref]p4: There shall be no references to references.
1928 // According to C++ DR 106, references to references are only
1929 // diagnosed when they are written directly (e.g., "int & &"),
1930 // but not when they happen via a typedef:
1932 // typedef int& intref;
1933 // typedef intref& intref2;
1935 // Parser::ParseDeclaratorInternal diagnoses the case where
1936 // references are written directly; here, we handle the
1937 // collapsing of references-to-references as described in C++0x.
1938 // DR 106 and 540 introduce reference-collapsing into C++98/03.
1941 // A declarator that specifies the type "reference to cv void"
1943 if (T->isVoidType()) {
1944 Diag(Loc, diag::err_reference_to_void);
1948 if (checkQualifiedFunction(*this, T, Loc, QFK_Reference))
1951 // In ARC, it is forbidden to build references to unqualified pointers.
1952 if (getLangOpts().ObjCAutoRefCount)
1953 T = inferARCLifetimeForPointee(*this, T, Loc, /*reference*/ true);
1955 // Handle restrict on references.
1957 return Context.getLValueReferenceType(T, SpelledAsLValue);
1958 return Context.getRValueReferenceType(T);
1961 /// \brief Build a Read-only Pipe type.
1963 /// \param T The type to which we'll be building a Pipe.
1965 /// \param Loc We do not use it for now.
1967 /// \returns A suitable pipe type, if there are no errors. Otherwise, returns a
1969 QualType Sema::BuildReadPipeType(QualType T, SourceLocation Loc) {
1970 return Context.getReadPipeType(T);
1973 /// \brief Build a Write-only Pipe type.
1975 /// \param T The type to which we'll be building a Pipe.
1977 /// \param Loc We do not use it for now.
1979 /// \returns A suitable pipe type, if there are no errors. Otherwise, returns a
1981 QualType Sema::BuildWritePipeType(QualType T, SourceLocation Loc) {
1982 return Context.getWritePipeType(T);
1985 /// Check whether the specified array size makes the array type a VLA. If so,
1986 /// return true, if not, return the size of the array in SizeVal.
1987 static bool isArraySizeVLA(Sema &S, Expr *ArraySize, llvm::APSInt &SizeVal) {
1988 // If the size is an ICE, it certainly isn't a VLA. If we're in a GNU mode
1989 // (like gnu99, but not c99) accept any evaluatable value as an extension.
1990 class VLADiagnoser : public Sema::VerifyICEDiagnoser {
1992 VLADiagnoser() : Sema::VerifyICEDiagnoser(true) {}
1994 void diagnoseNotICE(Sema &S, SourceLocation Loc, SourceRange SR) override {
1997 void diagnoseFold(Sema &S, SourceLocation Loc, SourceRange SR) override {
1998 S.Diag(Loc, diag::ext_vla_folded_to_constant) << SR;
2002 return S.VerifyIntegerConstantExpression(ArraySize, &SizeVal, Diagnoser,
2003 S.LangOpts.GNUMode ||
2004 S.LangOpts.OpenCL).isInvalid();
2007 /// \brief Build an array type.
2009 /// \param T The type of each element in the array.
2011 /// \param ASM C99 array size modifier (e.g., '*', 'static').
2013 /// \param ArraySize Expression describing the size of the array.
2015 /// \param Brackets The range from the opening '[' to the closing ']'.
2017 /// \param Entity The name of the entity that involves the array
2020 /// \returns A suitable array type, if there are no errors. Otherwise,
2021 /// returns a NULL type.
2022 QualType Sema::BuildArrayType(QualType T, ArrayType::ArraySizeModifier ASM,
2023 Expr *ArraySize, unsigned Quals,
2024 SourceRange Brackets, DeclarationName Entity) {
2026 SourceLocation Loc = Brackets.getBegin();
2027 if (getLangOpts().CPlusPlus) {
2028 // C++ [dcl.array]p1:
2029 // T is called the array element type; this type shall not be a reference
2030 // type, the (possibly cv-qualified) type void, a function type or an
2031 // abstract class type.
2033 // C++ [dcl.array]p3:
2034 // When several "array of" specifications are adjacent, [...] only the
2035 // first of the constant expressions that specify the bounds of the arrays
2038 // Note: function types are handled in the common path with C.
2039 if (T->isReferenceType()) {
2040 Diag(Loc, diag::err_illegal_decl_array_of_references)
2041 << getPrintableNameForEntity(Entity) << T;
2045 if (T->isVoidType() || T->isIncompleteArrayType()) {
2046 Diag(Loc, diag::err_illegal_decl_array_incomplete_type) << T;
2050 if (RequireNonAbstractType(Brackets.getBegin(), T,
2051 diag::err_array_of_abstract_type))
2054 // Mentioning a member pointer type for an array type causes us to lock in
2055 // an inheritance model, even if it's inside an unused typedef.
2056 if (Context.getTargetInfo().getCXXABI().isMicrosoft())
2057 if (const MemberPointerType *MPTy = T->getAs<MemberPointerType>())
2058 if (!MPTy->getClass()->isDependentType())
2059 (void)isCompleteType(Loc, T);
2062 // C99 6.7.5.2p1: If the element type is an incomplete or function type,
2063 // reject it (e.g. void ary[7], struct foo ary[7], void ary[7]())
2064 if (RequireCompleteType(Loc, T,
2065 diag::err_illegal_decl_array_incomplete_type))
2069 if (T->isFunctionType()) {
2070 Diag(Loc, diag::err_illegal_decl_array_of_functions)
2071 << getPrintableNameForEntity(Entity) << T;
2075 if (const RecordType *EltTy = T->getAs<RecordType>()) {
2076 // If the element type is a struct or union that contains a variadic
2077 // array, accept it as a GNU extension: C99 6.7.2.1p2.
2078 if (EltTy->getDecl()->hasFlexibleArrayMember())
2079 Diag(Loc, diag::ext_flexible_array_in_array) << T;
2080 } else if (T->isObjCObjectType()) {
2081 Diag(Loc, diag::err_objc_array_of_interfaces) << T;
2085 // Do placeholder conversions on the array size expression.
2086 if (ArraySize && ArraySize->hasPlaceholderType()) {
2087 ExprResult Result = CheckPlaceholderExpr(ArraySize);
2088 if (Result.isInvalid()) return QualType();
2089 ArraySize = Result.get();
2092 // Do lvalue-to-rvalue conversions on the array size expression.
2093 if (ArraySize && !ArraySize->isRValue()) {
2094 ExprResult Result = DefaultLvalueConversion(ArraySize);
2095 if (Result.isInvalid())
2098 ArraySize = Result.get();
2101 // C99 6.7.5.2p1: The size expression shall have integer type.
2102 // C++11 allows contextual conversions to such types.
2103 if (!getLangOpts().CPlusPlus11 &&
2104 ArraySize && !ArraySize->isTypeDependent() &&
2105 !ArraySize->getType()->isIntegralOrUnscopedEnumerationType()) {
2106 Diag(ArraySize->getLocStart(), diag::err_array_size_non_int)
2107 << ArraySize->getType() << ArraySize->getSourceRange();
2111 llvm::APSInt ConstVal(Context.getTypeSize(Context.getSizeType()));
2113 if (ASM == ArrayType::Star)
2114 T = Context.getVariableArrayType(T, nullptr, ASM, Quals, Brackets);
2116 T = Context.getIncompleteArrayType(T, ASM, Quals);
2117 } else if (ArraySize->isTypeDependent() || ArraySize->isValueDependent()) {
2118 T = Context.getDependentSizedArrayType(T, ArraySize, ASM, Quals, Brackets);
2119 } else if ((!T->isDependentType() && !T->isIncompleteType() &&
2120 !T->isConstantSizeType()) ||
2121 isArraySizeVLA(*this, ArraySize, ConstVal)) {
2122 // Even in C++11, don't allow contextual conversions in the array bound
2124 if (getLangOpts().CPlusPlus11 &&
2125 !ArraySize->getType()->isIntegralOrUnscopedEnumerationType()) {
2126 Diag(ArraySize->getLocStart(), diag::err_array_size_non_int)
2127 << ArraySize->getType() << ArraySize->getSourceRange();
2131 // C99: an array with an element type that has a non-constant-size is a VLA.
2132 // C99: an array with a non-ICE size is a VLA. We accept any expression
2133 // that we can fold to a non-zero positive value as an extension.
2134 T = Context.getVariableArrayType(T, ArraySize, ASM, Quals, Brackets);
2136 // C99 6.7.5.2p1: If the expression is a constant expression, it shall
2137 // have a value greater than zero.
2138 if (ConstVal.isSigned() && ConstVal.isNegative()) {
2140 Diag(ArraySize->getLocStart(), diag::err_decl_negative_array_size)
2141 << getPrintableNameForEntity(Entity) << ArraySize->getSourceRange();
2143 Diag(ArraySize->getLocStart(), diag::err_typecheck_negative_array_size)
2144 << ArraySize->getSourceRange();
2147 if (ConstVal == 0) {
2148 // GCC accepts zero sized static arrays. We allow them when
2149 // we're not in a SFINAE context.
2150 Diag(ArraySize->getLocStart(),
2151 isSFINAEContext()? diag::err_typecheck_zero_array_size
2152 : diag::ext_typecheck_zero_array_size)
2153 << ArraySize->getSourceRange();
2155 if (ASM == ArrayType::Static) {
2156 Diag(ArraySize->getLocStart(),
2157 diag::warn_typecheck_zero_static_array_size)
2158 << ArraySize->getSourceRange();
2159 ASM = ArrayType::Normal;
2161 } else if (!T->isDependentType() && !T->isVariablyModifiedType() &&
2162 !T->isIncompleteType() && !T->isUndeducedType()) {
2163 // Is the array too large?
2164 unsigned ActiveSizeBits
2165 = ConstantArrayType::getNumAddressingBits(Context, T, ConstVal);
2166 if (ActiveSizeBits > ConstantArrayType::getMaxSizeBits(Context)) {
2167 Diag(ArraySize->getLocStart(), diag::err_array_too_large)
2168 << ConstVal.toString(10)
2169 << ArraySize->getSourceRange();
2174 T = Context.getConstantArrayType(T, ConstVal, ASM, Quals);
2177 // OpenCL v1.2 s6.9.d: variable length arrays are not supported.
2178 if (getLangOpts().OpenCL && T->isVariableArrayType()) {
2179 Diag(Loc, diag::err_opencl_vla);
2182 // CUDA device code doesn't support VLAs.
2183 if (getLangOpts().CUDA && T->isVariableArrayType())
2184 CUDADiagIfDeviceCode(Loc, diag::err_cuda_vla) << CurrentCUDATarget();
2186 // If this is not C99, extwarn about VLA's and C99 array size modifiers.
2187 if (!getLangOpts().C99) {
2188 if (T->isVariableArrayType()) {
2189 // Prohibit the use of VLAs during template argument deduction.
2190 if (isSFINAEContext()) {
2191 Diag(Loc, diag::err_vla_in_sfinae);
2194 // Just extwarn about VLAs.
2196 Diag(Loc, diag::ext_vla);
2197 } else if (ASM != ArrayType::Normal || Quals != 0)
2199 getLangOpts().CPlusPlus? diag::err_c99_array_usage_cxx
2200 : diag::ext_c99_array_usage) << ASM;
2203 if (T->isVariableArrayType()) {
2204 // Warn about VLAs for -Wvla.
2205 Diag(Loc, diag::warn_vla_used);
2208 // OpenCL v2.0 s6.12.5 - Arrays of blocks are not supported.
2209 // OpenCL v2.0 s6.16.13.1 - Arrays of pipe type are not supported.
2210 // OpenCL v2.0 s6.9.b - Arrays of image/sampler type are not supported.
2211 if (getLangOpts().OpenCL) {
2212 const QualType ArrType = Context.getBaseElementType(T);
2213 if (ArrType->isBlockPointerType() || ArrType->isPipeType() ||
2214 ArrType->isSamplerT() || ArrType->isImageType()) {
2215 Diag(Loc, diag::err_opencl_invalid_type_array) << ArrType;
2223 /// \brief Build an ext-vector type.
2225 /// Run the required checks for the extended vector type.
2226 QualType Sema::BuildExtVectorType(QualType T, Expr *ArraySize,
2227 SourceLocation AttrLoc) {
2228 // Unlike gcc's vector_size attribute, we do not allow vectors to be defined
2229 // in conjunction with complex types (pointers, arrays, functions, etc.).
2231 // Additionally, OpenCL prohibits vectors of booleans (they're considered a
2232 // reserved data type under OpenCL v2.0 s6.1.4), we don't support selects
2233 // on bitvectors, and we have no well-defined ABI for bitvectors, so vectors
2234 // of bool aren't allowed.
2235 if ((!T->isDependentType() && !T->isIntegerType() &&
2236 !T->isRealFloatingType()) ||
2237 T->isBooleanType()) {
2238 Diag(AttrLoc, diag::err_attribute_invalid_vector_type) << T;
2242 if (!ArraySize->isTypeDependent() && !ArraySize->isValueDependent()) {
2243 llvm::APSInt vecSize(32);
2244 if (!ArraySize->isIntegerConstantExpr(vecSize, Context)) {
2245 Diag(AttrLoc, diag::err_attribute_argument_type)
2246 << "ext_vector_type" << AANT_ArgumentIntegerConstant
2247 << ArraySize->getSourceRange();
2251 // Unlike gcc's vector_size attribute, the size is specified as the
2252 // number of elements, not the number of bytes.
2253 unsigned vectorSize = static_cast<unsigned>(vecSize.getZExtValue());
2255 if (vectorSize == 0) {
2256 Diag(AttrLoc, diag::err_attribute_zero_size)
2257 << ArraySize->getSourceRange();
2261 if (VectorType::isVectorSizeTooLarge(vectorSize)) {
2262 Diag(AttrLoc, diag::err_attribute_size_too_large)
2263 << ArraySize->getSourceRange();
2267 return Context.getExtVectorType(T, vectorSize);
2270 return Context.getDependentSizedExtVectorType(T, ArraySize, AttrLoc);
2273 bool Sema::CheckFunctionReturnType(QualType T, SourceLocation Loc) {
2274 if (T->isArrayType() || T->isFunctionType()) {
2275 Diag(Loc, diag::err_func_returning_array_function)
2276 << T->isFunctionType() << T;
2280 // Functions cannot return half FP.
2281 if (T->isHalfType() && !getLangOpts().HalfArgsAndReturns) {
2282 Diag(Loc, diag::err_parameters_retval_cannot_have_fp16_type) << 1 <<
2283 FixItHint::CreateInsertion(Loc, "*");
2287 // Methods cannot return interface types. All ObjC objects are
2288 // passed by reference.
2289 if (T->isObjCObjectType()) {
2290 Diag(Loc, diag::err_object_cannot_be_passed_returned_by_value)
2291 << 0 << T << FixItHint::CreateInsertion(Loc, "*");
2298 /// Check the extended parameter information. Most of the necessary
2299 /// checking should occur when applying the parameter attribute; the
2300 /// only other checks required are positional restrictions.
2301 static void checkExtParameterInfos(Sema &S, ArrayRef<QualType> paramTypes,
2302 const FunctionProtoType::ExtProtoInfo &EPI,
2303 llvm::function_ref<SourceLocation(unsigned)> getParamLoc) {
2304 assert(EPI.ExtParameterInfos && "shouldn't get here without param infos");
2306 bool hasCheckedSwiftCall = false;
2307 auto checkForSwiftCC = [&](unsigned paramIndex) {
2308 // Only do this once.
2309 if (hasCheckedSwiftCall) return;
2310 hasCheckedSwiftCall = true;
2311 if (EPI.ExtInfo.getCC() == CC_Swift) return;
2312 S.Diag(getParamLoc(paramIndex), diag::err_swift_param_attr_not_swiftcall)
2313 << getParameterABISpelling(EPI.ExtParameterInfos[paramIndex].getABI());
2316 for (size_t paramIndex = 0, numParams = paramTypes.size();
2317 paramIndex != numParams; ++paramIndex) {
2318 switch (EPI.ExtParameterInfos[paramIndex].getABI()) {
2319 // Nothing interesting to check for orindary-ABI parameters.
2320 case ParameterABI::Ordinary:
2323 // swift_indirect_result parameters must be a prefix of the function
2325 case ParameterABI::SwiftIndirectResult:
2326 checkForSwiftCC(paramIndex);
2327 if (paramIndex != 0 &&
2328 EPI.ExtParameterInfos[paramIndex - 1].getABI()
2329 != ParameterABI::SwiftIndirectResult) {
2330 S.Diag(getParamLoc(paramIndex),
2331 diag::err_swift_indirect_result_not_first);
2335 case ParameterABI::SwiftContext:
2336 checkForSwiftCC(paramIndex);
2339 // swift_error parameters must be preceded by a swift_context parameter.
2340 case ParameterABI::SwiftErrorResult:
2341 checkForSwiftCC(paramIndex);
2342 if (paramIndex == 0 ||
2343 EPI.ExtParameterInfos[paramIndex - 1].getABI() !=
2344 ParameterABI::SwiftContext) {
2345 S.Diag(getParamLoc(paramIndex),
2346 diag::err_swift_error_result_not_after_swift_context);
2350 llvm_unreachable("bad ABI kind");
2354 QualType Sema::BuildFunctionType(QualType T,
2355 MutableArrayRef<QualType> ParamTypes,
2356 SourceLocation Loc, DeclarationName Entity,
2357 const FunctionProtoType::ExtProtoInfo &EPI) {
2358 bool Invalid = false;
2360 Invalid |= CheckFunctionReturnType(T, Loc);
2362 for (unsigned Idx = 0, Cnt = ParamTypes.size(); Idx < Cnt; ++Idx) {
2363 // FIXME: Loc is too inprecise here, should use proper locations for args.
2364 QualType ParamType = Context.getAdjustedParameterType(ParamTypes[Idx]);
2365 if (ParamType->isVoidType()) {
2366 Diag(Loc, diag::err_param_with_void_type);
2368 } else if (ParamType->isHalfType() && !getLangOpts().HalfArgsAndReturns) {
2369 // Disallow half FP arguments.
2370 Diag(Loc, diag::err_parameters_retval_cannot_have_fp16_type) << 0 <<
2371 FixItHint::CreateInsertion(Loc, "*");
2375 ParamTypes[Idx] = ParamType;
2378 if (EPI.ExtParameterInfos) {
2379 checkExtParameterInfos(*this, ParamTypes, EPI,
2380 [=](unsigned i) { return Loc; });
2383 if (EPI.ExtInfo.getProducesResult()) {
2384 // This is just a warning, so we can't fail to build if we see it.
2385 checkNSReturnsRetainedReturnType(Loc, T);
2391 return Context.getFunctionType(T, ParamTypes, EPI);
2394 /// \brief Build a member pointer type \c T Class::*.
2396 /// \param T the type to which the member pointer refers.
2397 /// \param Class the class type into which the member pointer points.
2398 /// \param Loc the location where this type begins
2399 /// \param Entity the name of the entity that will have this member pointer type
2401 /// \returns a member pointer type, if successful, or a NULL type if there was
2403 QualType Sema::BuildMemberPointerType(QualType T, QualType Class,
2405 DeclarationName Entity) {
2406 // Verify that we're not building a pointer to pointer to function with
2407 // exception specification.
2408 if (CheckDistantExceptionSpec(T)) {
2409 Diag(Loc, diag::err_distant_exception_spec);
2413 // C++ 8.3.3p3: A pointer to member shall not point to ... a member
2414 // with reference type, or "cv void."
2415 if (T->isReferenceType()) {
2416 Diag(Loc, diag::err_illegal_decl_mempointer_to_reference)
2417 << getPrintableNameForEntity(Entity) << T;
2421 if (T->isVoidType()) {
2422 Diag(Loc, diag::err_illegal_decl_mempointer_to_void)
2423 << getPrintableNameForEntity(Entity);
2427 if (!Class->isDependentType() && !Class->isRecordType()) {
2428 Diag(Loc, diag::err_mempointer_in_nonclass_type) << Class;
2432 // Adjust the default free function calling convention to the default method
2433 // calling convention.
2435 (Entity.getNameKind() == DeclarationName::CXXConstructorName) ||
2436 (Entity.getNameKind() == DeclarationName::CXXDestructorName);
2437 if (T->isFunctionType())
2438 adjustMemberFunctionCC(T, /*IsStatic=*/false, IsCtorOrDtor, Loc);
2440 return Context.getMemberPointerType(T, Class.getTypePtr());
2443 /// \brief Build a block pointer type.
2445 /// \param T The type to which we'll be building a block pointer.
2447 /// \param Loc The source location, used for diagnostics.
2449 /// \param Entity The name of the entity that involves the block pointer
2452 /// \returns A suitable block pointer type, if there are no
2453 /// errors. Otherwise, returns a NULL type.
2454 QualType Sema::BuildBlockPointerType(QualType T,
2456 DeclarationName Entity) {
2457 if (!T->isFunctionType()) {
2458 Diag(Loc, diag::err_nonfunction_block_type);
2462 if (checkQualifiedFunction(*this, T, Loc, QFK_BlockPointer))
2465 return Context.getBlockPointerType(T);
2468 QualType Sema::GetTypeFromParser(ParsedType Ty, TypeSourceInfo **TInfo) {
2469 QualType QT = Ty.get();
2471 if (TInfo) *TInfo = nullptr;
2475 TypeSourceInfo *DI = nullptr;
2476 if (const LocInfoType *LIT = dyn_cast<LocInfoType>(QT)) {
2477 QT = LIT->getType();
2478 DI = LIT->getTypeSourceInfo();
2481 if (TInfo) *TInfo = DI;
2485 static void transferARCOwnershipToDeclaratorChunk(TypeProcessingState &state,
2486 Qualifiers::ObjCLifetime ownership,
2487 unsigned chunkIndex);
2489 /// Given that this is the declaration of a parameter under ARC,
2490 /// attempt to infer attributes and such for pointer-to-whatever
2492 static void inferARCWriteback(TypeProcessingState &state,
2493 QualType &declSpecType) {
2494 Sema &S = state.getSema();
2495 Declarator &declarator = state.getDeclarator();
2497 // TODO: should we care about decl qualifiers?
2499 // Check whether the declarator has the expected form. We walk
2500 // from the inside out in order to make the block logic work.
2501 unsigned outermostPointerIndex = 0;
2502 bool isBlockPointer = false;
2503 unsigned numPointers = 0;
2504 for (unsigned i = 0, e = declarator.getNumTypeObjects(); i != e; ++i) {
2505 unsigned chunkIndex = i;
2506 DeclaratorChunk &chunk = declarator.getTypeObject(chunkIndex);
2507 switch (chunk.Kind) {
2508 case DeclaratorChunk::Paren:
2512 case DeclaratorChunk::Reference:
2513 case DeclaratorChunk::Pointer:
2514 // Count the number of pointers. Treat references
2515 // interchangeably as pointers; if they're mis-ordered, normal
2516 // type building will discover that.
2517 outermostPointerIndex = chunkIndex;
2521 case DeclaratorChunk::BlockPointer:
2522 // If we have a pointer to block pointer, that's an acceptable
2523 // indirect reference; anything else is not an application of
2525 if (numPointers != 1) return;
2527 outermostPointerIndex = chunkIndex;
2528 isBlockPointer = true;
2530 // We don't care about pointer structure in return values here.
2533 case DeclaratorChunk::Array: // suppress if written (id[])?
2534 case DeclaratorChunk::Function:
2535 case DeclaratorChunk::MemberPointer:
2536 case DeclaratorChunk::Pipe:
2542 // If we have *one* pointer, then we want to throw the qualifier on
2543 // the declaration-specifiers, which means that it needs to be a
2544 // retainable object type.
2545 if (numPointers == 1) {
2546 // If it's not a retainable object type, the rule doesn't apply.
2547 if (!declSpecType->isObjCRetainableType()) return;
2549 // If it already has lifetime, don't do anything.
2550 if (declSpecType.getObjCLifetime()) return;
2552 // Otherwise, modify the type in-place.
2555 if (declSpecType->isObjCARCImplicitlyUnretainedType())
2556 qs.addObjCLifetime(Qualifiers::OCL_ExplicitNone);
2558 qs.addObjCLifetime(Qualifiers::OCL_Autoreleasing);
2559 declSpecType = S.Context.getQualifiedType(declSpecType, qs);
2561 // If we have *two* pointers, then we want to throw the qualifier on
2562 // the outermost pointer.
2563 } else if (numPointers == 2) {
2564 // If we don't have a block pointer, we need to check whether the
2565 // declaration-specifiers gave us something that will turn into a
2566 // retainable object pointer after we slap the first pointer on it.
2567 if (!isBlockPointer && !declSpecType->isObjCObjectType())
2570 // Look for an explicit lifetime attribute there.
2571 DeclaratorChunk &chunk = declarator.getTypeObject(outermostPointerIndex);
2572 if (chunk.Kind != DeclaratorChunk::Pointer &&
2573 chunk.Kind != DeclaratorChunk::BlockPointer)
2575 for (const AttributeList *attr = chunk.getAttrs(); attr;
2576 attr = attr->getNext())
2577 if (attr->getKind() == AttributeList::AT_ObjCOwnership)
2580 transferARCOwnershipToDeclaratorChunk(state, Qualifiers::OCL_Autoreleasing,
2581 outermostPointerIndex);
2583 // Any other number of pointers/references does not trigger the rule.
2586 // TODO: mark whether we did this inference?
2589 void Sema::diagnoseIgnoredQualifiers(unsigned DiagID, unsigned Quals,
2590 SourceLocation FallbackLoc,
2591 SourceLocation ConstQualLoc,
2592 SourceLocation VolatileQualLoc,
2593 SourceLocation RestrictQualLoc,
2594 SourceLocation AtomicQualLoc,
2595 SourceLocation UnalignedQualLoc) {
2603 } const QualKinds[5] = {
2604 { "const", DeclSpec::TQ_const, ConstQualLoc },
2605 { "volatile", DeclSpec::TQ_volatile, VolatileQualLoc },
2606 { "restrict", DeclSpec::TQ_restrict, RestrictQualLoc },
2607 { "__unaligned", DeclSpec::TQ_unaligned, UnalignedQualLoc },
2608 { "_Atomic", DeclSpec::TQ_atomic, AtomicQualLoc }
2611 SmallString<32> QualStr;
2612 unsigned NumQuals = 0;
2614 FixItHint FixIts[5];
2616 // Build a string naming the redundant qualifiers.
2617 for (auto &E : QualKinds) {
2618 if (Quals & E.Mask) {
2619 if (!QualStr.empty()) QualStr += ' ';
2622 // If we have a location for the qualifier, offer a fixit.
2623 SourceLocation QualLoc = E.Loc;
2624 if (QualLoc.isValid()) {
2625 FixIts[NumQuals] = FixItHint::CreateRemoval(QualLoc);
2626 if (Loc.isInvalid() ||
2627 getSourceManager().isBeforeInTranslationUnit(QualLoc, Loc))
2635 Diag(Loc.isInvalid() ? FallbackLoc : Loc, DiagID)
2636 << QualStr << NumQuals << FixIts[0] << FixIts[1] << FixIts[2] << FixIts[3];
2639 // Diagnose pointless type qualifiers on the return type of a function.
2640 static void diagnoseRedundantReturnTypeQualifiers(Sema &S, QualType RetTy,
2642 unsigned FunctionChunkIndex) {
2643 if (D.getTypeObject(FunctionChunkIndex).Fun.hasTrailingReturnType()) {
2644 // FIXME: TypeSourceInfo doesn't preserve location information for
2646 S.diagnoseIgnoredQualifiers(diag::warn_qual_return_type,
2647 RetTy.getLocalCVRQualifiers(),
2648 D.getIdentifierLoc());
2652 for (unsigned OuterChunkIndex = FunctionChunkIndex + 1,
2653 End = D.getNumTypeObjects();
2654 OuterChunkIndex != End; ++OuterChunkIndex) {
2655 DeclaratorChunk &OuterChunk = D.getTypeObject(OuterChunkIndex);
2656 switch (OuterChunk.Kind) {
2657 case DeclaratorChunk::Paren:
2660 case DeclaratorChunk::Pointer: {
2661 DeclaratorChunk::PointerTypeInfo &PTI = OuterChunk.Ptr;
2662 S.diagnoseIgnoredQualifiers(
2663 diag::warn_qual_return_type,
2666 SourceLocation::getFromRawEncoding(PTI.ConstQualLoc),
2667 SourceLocation::getFromRawEncoding(PTI.VolatileQualLoc),
2668 SourceLocation::getFromRawEncoding(PTI.RestrictQualLoc),
2669 SourceLocation::getFromRawEncoding(PTI.AtomicQualLoc),
2670 SourceLocation::getFromRawEncoding(PTI.UnalignedQualLoc));
2674 case DeclaratorChunk::Function:
2675 case DeclaratorChunk::BlockPointer:
2676 case DeclaratorChunk::Reference:
2677 case DeclaratorChunk::Array:
2678 case DeclaratorChunk::MemberPointer:
2679 case DeclaratorChunk::Pipe:
2680 // FIXME: We can't currently provide an accurate source location and a
2681 // fix-it hint for these.
2682 unsigned AtomicQual = RetTy->isAtomicType() ? DeclSpec::TQ_atomic : 0;
2683 S.diagnoseIgnoredQualifiers(diag::warn_qual_return_type,
2684 RetTy.getCVRQualifiers() | AtomicQual,
2685 D.getIdentifierLoc());
2689 llvm_unreachable("unknown declarator chunk kind");
2692 // If the qualifiers come from a conversion function type, don't diagnose
2693 // them -- they're not necessarily redundant, since such a conversion
2694 // operator can be explicitly called as "x.operator const int()".
2695 if (D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId)
2698 // Just parens all the way out to the decl specifiers. Diagnose any qualifiers
2699 // which are present there.
2700 S.diagnoseIgnoredQualifiers(diag::warn_qual_return_type,
2701 D.getDeclSpec().getTypeQualifiers(),
2702 D.getIdentifierLoc(),
2703 D.getDeclSpec().getConstSpecLoc(),
2704 D.getDeclSpec().getVolatileSpecLoc(),
2705 D.getDeclSpec().getRestrictSpecLoc(),
2706 D.getDeclSpec().getAtomicSpecLoc(),
2707 D.getDeclSpec().getUnalignedSpecLoc());
2710 static QualType GetDeclSpecTypeForDeclarator(TypeProcessingState &state,
2711 TypeSourceInfo *&ReturnTypeInfo) {
2712 Sema &SemaRef = state.getSema();
2713 Declarator &D = state.getDeclarator();
2715 ReturnTypeInfo = nullptr;
2717 // The TagDecl owned by the DeclSpec.
2718 TagDecl *OwnedTagDecl = nullptr;
2720 switch (D.getName().getKind()) {
2721 case UnqualifiedId::IK_ImplicitSelfParam:
2722 case UnqualifiedId::IK_OperatorFunctionId:
2723 case UnqualifiedId::IK_Identifier:
2724 case UnqualifiedId::IK_LiteralOperatorId:
2725 case UnqualifiedId::IK_TemplateId:
2726 T = ConvertDeclSpecToType(state);
2728 if (!D.isInvalidType() && D.getDeclSpec().isTypeSpecOwned()) {
2729 OwnedTagDecl = cast<TagDecl>(D.getDeclSpec().getRepAsDecl());
2730 // Owned declaration is embedded in declarator.
2731 OwnedTagDecl->setEmbeddedInDeclarator(true);
2735 case UnqualifiedId::IK_ConstructorName:
2736 case UnqualifiedId::IK_ConstructorTemplateId:
2737 case UnqualifiedId::IK_DestructorName:
2738 // Constructors and destructors don't have return types. Use
2740 T = SemaRef.Context.VoidTy;
2741 processTypeAttrs(state, T, TAL_DeclSpec,
2742 D.getDeclSpec().getAttributes().getList());
2745 case UnqualifiedId::IK_DeductionGuideName:
2746 // Deduction guides have a trailing return type and no type in their
2747 // decl-specifier sequence. Use a placeholder return type for now.
2748 T = SemaRef.Context.DependentTy;
2751 case UnqualifiedId::IK_ConversionFunctionId:
2752 // The result type of a conversion function is the type that it
2754 T = SemaRef.GetTypeFromParser(D.getName().ConversionFunctionId,
2759 if (D.getAttributes())
2760 distributeTypeAttrsFromDeclarator(state, T);
2762 // C++11 [dcl.spec.auto]p5: reject 'auto' if it is not in an allowed context.
2763 if (DeducedType *Deduced = T->getContainedDeducedType()) {
2764 AutoType *Auto = dyn_cast<AutoType>(Deduced);
2767 // Is this a 'auto' or 'decltype(auto)' type (as opposed to __auto_type or
2768 // class template argument deduction)?
2769 bool IsCXXAutoType =
2770 (Auto && Auto->getKeyword() != AutoTypeKeyword::GNUAutoType);
2772 switch (D.getContext()) {
2773 case Declarator::LambdaExprContext:
2774 // Declared return type of a lambda-declarator is implicit and is always
2777 case Declarator::ObjCParameterContext:
2778 case Declarator::ObjCResultContext:
2779 case Declarator::PrototypeContext:
2782 case Declarator::LambdaExprParameterContext:
2783 // In C++14, generic lambdas allow 'auto' in their parameters.
2784 if (!SemaRef.getLangOpts().CPlusPlus14 ||
2785 !Auto || Auto->getKeyword() != AutoTypeKeyword::Auto)
2788 // If auto is mentioned in a lambda parameter context, convert it to a
2789 // template parameter type.
2790 sema::LambdaScopeInfo *LSI = SemaRef.getCurLambda();
2791 assert(LSI && "No LambdaScopeInfo on the stack!");
2792 const unsigned TemplateParameterDepth = LSI->AutoTemplateParameterDepth;
2793 const unsigned AutoParameterPosition = LSI->AutoTemplateParams.size();
2794 const bool IsParameterPack = D.hasEllipsis();
2796 // Create the TemplateTypeParmDecl here to retrieve the corresponding
2797 // template parameter type. Template parameters are temporarily added
2798 // to the TU until the associated TemplateDecl is created.
2799 TemplateTypeParmDecl *CorrespondingTemplateParam =
2800 TemplateTypeParmDecl::Create(
2801 SemaRef.Context, SemaRef.Context.getTranslationUnitDecl(),
2802 /*KeyLoc*/SourceLocation(), /*NameLoc*/D.getLocStart(),
2803 TemplateParameterDepth, AutoParameterPosition,
2804 /*Identifier*/nullptr, false, IsParameterPack);
2805 LSI->AutoTemplateParams.push_back(CorrespondingTemplateParam);
2806 // Replace the 'auto' in the function parameter with this invented
2807 // template type parameter.
2808 // FIXME: Retain some type sugar to indicate that this was written
2810 T = SemaRef.ReplaceAutoType(
2811 T, QualType(CorrespondingTemplateParam->getTypeForDecl(), 0));
2814 case Declarator::MemberContext: {
2815 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_static ||
2816 D.isFunctionDeclarator())
2818 bool Cxx = SemaRef.getLangOpts().CPlusPlus;
2819 switch (cast<TagDecl>(SemaRef.CurContext)->getTagKind()) {
2820 case TTK_Enum: llvm_unreachable("unhandled tag kind");
2821 case TTK_Struct: Error = Cxx ? 1 : 2; /* Struct member */ break;
2822 case TTK_Union: Error = Cxx ? 3 : 4; /* Union member */ break;
2823 case TTK_Class: Error = 5; /* Class member */ break;
2824 case TTK_Interface: Error = 6; /* Interface member */ break;
2826 if (D.getDeclSpec().isFriendSpecified())
2827 Error = 20; // Friend type
2830 case Declarator::CXXCatchContext:
2831 case Declarator::ObjCCatchContext:
2832 Error = 7; // Exception declaration
2834 case Declarator::TemplateParamContext:
2835 if (isa<DeducedTemplateSpecializationType>(Deduced))
2836 Error = 19; // Template parameter
2837 else if (!SemaRef.getLangOpts().CPlusPlus1z)
2838 Error = 8; // Template parameter (until C++1z)
2840 case Declarator::BlockLiteralContext:
2841 Error = 9; // Block literal
2843 case Declarator::TemplateTypeArgContext:
2844 Error = 10; // Template type argument
2846 case Declarator::AliasDeclContext:
2847 case Declarator::AliasTemplateContext:
2848 Error = 12; // Type alias
2850 case Declarator::TrailingReturnContext:
2851 if (!SemaRef.getLangOpts().CPlusPlus14 || !IsCXXAutoType)
2852 Error = 13; // Function return type
2854 case Declarator::ConversionIdContext:
2855 if (!SemaRef.getLangOpts().CPlusPlus14 || !IsCXXAutoType)
2856 Error = 14; // conversion-type-id
2858 case Declarator::FunctionalCastContext:
2859 if (isa<DeducedTemplateSpecializationType>(Deduced))
2862 case Declarator::TypeNameContext:
2863 Error = 15; // Generic
2865 case Declarator::FileContext:
2866 case Declarator::BlockContext:
2867 case Declarator::ForContext:
2868 case Declarator::InitStmtContext:
2869 case Declarator::ConditionContext:
2870 // FIXME: P0091R3 (erroneously) does not permit class template argument
2871 // deduction in conditions, for-init-statements, and other declarations
2872 // that are not simple-declarations.
2874 case Declarator::CXXNewContext:
2875 // FIXME: P0091R3 does not permit class template argument deduction here,
2876 // but we follow GCC and allow it anyway.
2877 if (!IsCXXAutoType && !isa<DeducedTemplateSpecializationType>(Deduced))
2878 Error = 17; // 'new' type
2880 case Declarator::KNRTypeListContext:
2881 Error = 18; // K&R function parameter
2885 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef)
2888 // In Objective-C it is an error to use 'auto' on a function declarator
2889 // (and everywhere for '__auto_type').
2890 if (D.isFunctionDeclarator() &&
2891 (!SemaRef.getLangOpts().CPlusPlus11 || !IsCXXAutoType))
2894 bool HaveTrailing = false;
2896 // C++11 [dcl.spec.auto]p2: 'auto' is always fine if the declarator
2897 // contains a trailing return type. That is only legal at the outermost
2898 // level. Check all declarator chunks (outermost first) anyway, to give
2899 // better diagnostics.
2900 // We don't support '__auto_type' with trailing return types.
2901 // FIXME: Should we only do this for 'auto' and not 'decltype(auto)'?
2902 if (SemaRef.getLangOpts().CPlusPlus11 && IsCXXAutoType &&
2903 D.hasTrailingReturnType()) {
2904 HaveTrailing = true;
2908 SourceRange AutoRange = D.getDeclSpec().getTypeSpecTypeLoc();
2909 if (D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId)
2910 AutoRange = D.getName().getSourceRange();
2915 switch (Auto->getKeyword()) {
2916 case AutoTypeKeyword::Auto: Kind = 0; break;
2917 case AutoTypeKeyword::DecltypeAuto: Kind = 1; break;
2918 case AutoTypeKeyword::GNUAutoType: Kind = 2; break;
2921 assert(isa<DeducedTemplateSpecializationType>(Deduced) &&
2922 "unknown auto type");
2926 auto *DTST = dyn_cast<DeducedTemplateSpecializationType>(Deduced);
2927 TemplateName TN = DTST ? DTST->getTemplateName() : TemplateName();
2929 SemaRef.Diag(AutoRange.getBegin(), diag::err_auto_not_allowed)
2930 << Kind << Error << (int)SemaRef.getTemplateNameKindForDiagnostics(TN)
2931 << QualType(Deduced, 0) << AutoRange;
2932 if (auto *TD = TN.getAsTemplateDecl())
2933 SemaRef.Diag(TD->getLocation(), diag::note_template_decl_here);
2935 T = SemaRef.Context.IntTy;
2936 D.setInvalidType(true);
2937 } else if (!HaveTrailing) {
2938 // If there was a trailing return type, we already got
2939 // warn_cxx98_compat_trailing_return_type in the parser.
2940 SemaRef.Diag(AutoRange.getBegin(),
2941 diag::warn_cxx98_compat_auto_type_specifier)
2946 if (SemaRef.getLangOpts().CPlusPlus &&
2947 OwnedTagDecl && OwnedTagDecl->isCompleteDefinition()) {
2948 // Check the contexts where C++ forbids the declaration of a new class
2949 // or enumeration in a type-specifier-seq.
2950 unsigned DiagID = 0;
2951 switch (D.getContext()) {
2952 case Declarator::TrailingReturnContext:
2953 // Class and enumeration definitions are syntactically not allowed in
2954 // trailing return types.
2955 llvm_unreachable("parser should not have allowed this");
2957 case Declarator::FileContext:
2958 case Declarator::MemberContext:
2959 case Declarator::BlockContext:
2960 case Declarator::ForContext:
2961 case Declarator::InitStmtContext:
2962 case Declarator::BlockLiteralContext:
2963 case Declarator::LambdaExprContext:
2964 // C++11 [dcl.type]p3:
2965 // A type-specifier-seq shall not define a class or enumeration unless
2966 // it appears in the type-id of an alias-declaration (7.1.3) that is not
2967 // the declaration of a template-declaration.
2968 case Declarator::AliasDeclContext:
2970 case Declarator::AliasTemplateContext:
2971 DiagID = diag::err_type_defined_in_alias_template;
2973 case Declarator::TypeNameContext:
2974 case Declarator::FunctionalCastContext:
2975 case Declarator::ConversionIdContext:
2976 case Declarator::TemplateParamContext:
2977 case Declarator::CXXNewContext:
2978 case Declarator::CXXCatchContext:
2979 case Declarator::ObjCCatchContext:
2980 case Declarator::TemplateTypeArgContext:
2981 DiagID = diag::err_type_defined_in_type_specifier;
2983 case Declarator::PrototypeContext:
2984 case Declarator::LambdaExprParameterContext:
2985 case Declarator::ObjCParameterContext:
2986 case Declarator::ObjCResultContext:
2987 case Declarator::KNRTypeListContext:
2989 // Types shall not be defined in return or parameter types.
2990 DiagID = diag::err_type_defined_in_param_type;
2992 case Declarator::ConditionContext:
2994 // The type-specifier-seq shall not contain typedef and shall not declare
2995 // a new class or enumeration.
2996 DiagID = diag::err_type_defined_in_condition;
3001 SemaRef.Diag(OwnedTagDecl->getLocation(), DiagID)
3002 << SemaRef.Context.getTypeDeclType(OwnedTagDecl);
3003 D.setInvalidType(true);
3007 assert(!T.isNull() && "This function should not return a null type");
3011 /// Produce an appropriate diagnostic for an ambiguity between a function
3012 /// declarator and a C++ direct-initializer.
3013 static void warnAboutAmbiguousFunction(Sema &S, Declarator &D,
3014 DeclaratorChunk &DeclType, QualType RT) {
3015 const DeclaratorChunk::FunctionTypeInfo &FTI = DeclType.Fun;
3016 assert(FTI.isAmbiguous && "no direct-initializer / function ambiguity");
3018 // If the return type is void there is no ambiguity.
3019 if (RT->isVoidType())
3022 // An initializer for a non-class type can have at most one argument.
3023 if (!RT->isRecordType() && FTI.NumParams > 1)
3026 // An initializer for a reference must have exactly one argument.
3027 if (RT->isReferenceType() && FTI.NumParams != 1)
3030 // Only warn if this declarator is declaring a function at block scope, and
3031 // doesn't have a storage class (such as 'extern') specified.
3032 if (!D.isFunctionDeclarator() ||
3033 D.getFunctionDefinitionKind() != FDK_Declaration ||
3034 !S.CurContext->isFunctionOrMethod() ||
3035 D.getDeclSpec().getStorageClassSpec()
3036 != DeclSpec::SCS_unspecified)
3039 // Inside a condition, a direct initializer is not permitted. We allow one to
3040 // be parsed in order to give better diagnostics in condition parsing.
3041 if (D.getContext() == Declarator::ConditionContext)
3044 SourceRange ParenRange(DeclType.Loc, DeclType.EndLoc);
3046 S.Diag(DeclType.Loc,
3047 FTI.NumParams ? diag::warn_parens_disambiguated_as_function_declaration
3048 : diag::warn_empty_parens_are_function_decl)
3051 // If the declaration looks like:
3054 // and name lookup finds a function named 'f', then the ',' was
3055 // probably intended to be a ';'.
3056 if (!D.isFirstDeclarator() && D.getIdentifier()) {
3057 FullSourceLoc Comma(D.getCommaLoc(), S.SourceMgr);
3058 FullSourceLoc Name(D.getIdentifierLoc(), S.SourceMgr);
3059 if (Comma.getFileID() != Name.getFileID() ||
3060 Comma.getSpellingLineNumber() != Name.getSpellingLineNumber()) {
3061 LookupResult Result(S, D.getIdentifier(), SourceLocation(),
3062 Sema::LookupOrdinaryName);
3063 if (S.LookupName(Result, S.getCurScope()))
3064 S.Diag(D.getCommaLoc(), diag::note_empty_parens_function_call)
3065 << FixItHint::CreateReplacement(D.getCommaLoc(), ";")
3066 << D.getIdentifier();
3070 if (FTI.NumParams > 0) {
3071 // For a declaration with parameters, eg. "T var(T());", suggest adding
3072 // parens around the first parameter to turn the declaration into a
3073 // variable declaration.
3074 SourceRange Range = FTI.Params[0].Param->getSourceRange();
3075 SourceLocation B = Range.getBegin();
3076 SourceLocation E = S.getLocForEndOfToken(Range.getEnd());
3077 // FIXME: Maybe we should suggest adding braces instead of parens
3078 // in C++11 for classes that don't have an initializer_list constructor.
3079 S.Diag(B, diag::note_additional_parens_for_variable_declaration)
3080 << FixItHint::CreateInsertion(B, "(")
3081 << FixItHint::CreateInsertion(E, ")");
3083 // For a declaration without parameters, eg. "T var();", suggest replacing
3084 // the parens with an initializer to turn the declaration into a variable
3086 const CXXRecordDecl *RD = RT->getAsCXXRecordDecl();
3088 // Empty parens mean value-initialization, and no parens mean
3089 // default initialization. These are equivalent if the default
3090 // constructor is user-provided or if zero-initialization is a
3092 if (RD && RD->hasDefinition() &&
3093 (RD->isEmpty() || RD->hasUserProvidedDefaultConstructor()))
3094 S.Diag(DeclType.Loc, diag::note_empty_parens_default_ctor)
3095 << FixItHint::CreateRemoval(ParenRange);
3098 S.getFixItZeroInitializerForType(RT, ParenRange.getBegin());
3099 if (Init.empty() && S.LangOpts.CPlusPlus11)
3102 S.Diag(DeclType.Loc, diag::note_empty_parens_zero_initialize)
3103 << FixItHint::CreateReplacement(ParenRange, Init);
3108 /// Helper for figuring out the default CC for a function declarator type. If
3109 /// this is the outermost chunk, then we can determine the CC from the
3110 /// declarator context. If not, then this could be either a member function
3111 /// type or normal function type.
3113 getCCForDeclaratorChunk(Sema &S, Declarator &D,
3114 const DeclaratorChunk::FunctionTypeInfo &FTI,
3115 unsigned ChunkIndex) {
3116 assert(D.getTypeObject(ChunkIndex).Kind == DeclaratorChunk::Function);
3118 // Check for an explicit CC attribute.
3119 for (auto Attr = FTI.AttrList; Attr; Attr = Attr->getNext()) {
3120 switch (Attr->getKind()) {
3121 CALLING_CONV_ATTRS_CASELIST: {
3122 // Ignore attributes that don't validate or can't apply to the
3123 // function type. We'll diagnose the failure to apply them in
3124 // handleFunctionTypeAttr.
3126 if (!S.CheckCallingConvAttr(*Attr, CC) &&
3127 (!FTI.isVariadic || supportsVariadicCall(CC))) {
3138 bool IsCXXInstanceMethod = false;
3140 if (S.getLangOpts().CPlusPlus) {
3141 // Look inwards through parentheses to see if this chunk will form a
3142 // member pointer type or if we're the declarator. Any type attributes
3143 // between here and there will override the CC we choose here.
3144 unsigned I = ChunkIndex;
3145 bool FoundNonParen = false;
3146 while (I && !FoundNonParen) {
3148 if (D.getTypeObject(I).Kind != DeclaratorChunk::Paren)
3149 FoundNonParen = true;
3152 if (FoundNonParen) {
3153 // If we're not the declarator, we're a regular function type unless we're
3154 // in a member pointer.
3155 IsCXXInstanceMethod =
3156 D.getTypeObject(I).Kind == DeclaratorChunk::MemberPointer;
3157 } else if (D.getContext() == Declarator::LambdaExprContext) {
3158 // This can only be a call operator for a lambda, which is an instance
3160 IsCXXInstanceMethod = true;
3162 // We're the innermost decl chunk, so must be a function declarator.
3163 assert(D.isFunctionDeclarator());
3165 // If we're inside a record, we're declaring a method, but it could be
3166 // explicitly or implicitly static.
3167 IsCXXInstanceMethod =
3168 D.isFirstDeclarationOfMember() &&
3169 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef &&
3170 !D.isStaticMember();
3174 CallingConv CC = S.Context.getDefaultCallingConvention(FTI.isVariadic,
3175 IsCXXInstanceMethod);
3177 // Attribute AT_OpenCLKernel affects the calling convention for SPIR
3178 // and AMDGPU targets, hence it cannot be treated as a calling
3179 // convention attribute. This is the simplest place to infer
3180 // calling convention for OpenCL kernels.
3181 if (S.getLangOpts().OpenCL) {
3182 for (const AttributeList *Attr = D.getDeclSpec().getAttributes().getList();
3183 Attr; Attr = Attr->getNext()) {
3184 if (Attr->getKind() == AttributeList::AT_OpenCLKernel) {
3185 CC = CC_OpenCLKernel;
3195 /// A simple notion of pointer kinds, which matches up with the various
3196 /// pointer declarators.
3197 enum class SimplePointerKind {
3203 } // end anonymous namespace
3205 IdentifierInfo *Sema::getNullabilityKeyword(NullabilityKind nullability) {
3206 switch (nullability) {
3207 case NullabilityKind::NonNull:
3208 if (!Ident__Nonnull)
3209 Ident__Nonnull = PP.getIdentifierInfo("_Nonnull");
3210 return Ident__Nonnull;
3212 case NullabilityKind::Nullable:
3213 if (!Ident__Nullable)
3214 Ident__Nullable = PP.getIdentifierInfo("_Nullable");
3215 return Ident__Nullable;
3217 case NullabilityKind::Unspecified:
3218 if (!Ident__Null_unspecified)
3219 Ident__Null_unspecified = PP.getIdentifierInfo("_Null_unspecified");
3220 return Ident__Null_unspecified;
3222 llvm_unreachable("Unknown nullability kind.");
3225 /// Retrieve the identifier "NSError".
3226 IdentifierInfo *Sema::getNSErrorIdent() {
3228 Ident_NSError = PP.getIdentifierInfo("NSError");
3230 return Ident_NSError;
3233 /// Check whether there is a nullability attribute of any kind in the given
3235 static bool hasNullabilityAttr(const AttributeList *attrs) {
3236 for (const AttributeList *attr = attrs; attr;
3237 attr = attr->getNext()) {
3238 if (attr->getKind() == AttributeList::AT_TypeNonNull ||
3239 attr->getKind() == AttributeList::AT_TypeNullable ||
3240 attr->getKind() == AttributeList::AT_TypeNullUnspecified)
3248 /// Describes the kind of a pointer a declarator describes.
3249 enum class PointerDeclaratorKind {
3252 // Single-level pointer.
3254 // Multi-level pointer (of any pointer kind).
3257 MaybePointerToCFRef,
3261 NSErrorPointerPointer,
3264 /// Describes a declarator chunk wrapping a pointer that marks inference as
3266 // These values must be kept in sync with diagnostics.
3267 enum class PointerWrappingDeclaratorKind {
3268 /// Pointer is top-level.
3270 /// Pointer is an array element.
3272 /// Pointer is the referent type of a C++ reference.
3275 } // end anonymous namespace
3277 /// Classify the given declarator, whose type-specified is \c type, based on
3278 /// what kind of pointer it refers to.
3280 /// This is used to determine the default nullability.
3281 static PointerDeclaratorKind
3282 classifyPointerDeclarator(Sema &S, QualType type, Declarator &declarator,
3283 PointerWrappingDeclaratorKind &wrappingKind) {
3284 unsigned numNormalPointers = 0;
3286 // For any dependent type, we consider it a non-pointer.
3287 if (type->isDependentType())
3288 return PointerDeclaratorKind::NonPointer;
3290 // Look through the declarator chunks to identify pointers.
3291 for (unsigned i = 0, n = declarator.getNumTypeObjects(); i != n; ++i) {
3292 DeclaratorChunk &chunk = declarator.getTypeObject(i);
3293 switch (chunk.Kind) {
3294 case DeclaratorChunk::Array:
3295 if (numNormalPointers == 0)
3296 wrappingKind = PointerWrappingDeclaratorKind::Array;
3299 case DeclaratorChunk::Function:
3300 case DeclaratorChunk::Pipe:
3303 case DeclaratorChunk::BlockPointer:
3304 case DeclaratorChunk::MemberPointer:
3305 return numNormalPointers > 0 ? PointerDeclaratorKind::MultiLevelPointer
3306 : PointerDeclaratorKind::SingleLevelPointer;
3308 case DeclaratorChunk::Paren:
3311 case DeclaratorChunk::Reference:
3312 if (numNormalPointers == 0)
3313 wrappingKind = PointerWrappingDeclaratorKind::Reference;
3316 case DeclaratorChunk::Pointer:
3317 ++numNormalPointers;
3318 if (numNormalPointers > 2)
3319 return PointerDeclaratorKind::MultiLevelPointer;
3324 // Then, dig into the type specifier itself.
3325 unsigned numTypeSpecifierPointers = 0;
3327 // Decompose normal pointers.
3328 if (auto ptrType = type->getAs<PointerType>()) {
3329 ++numNormalPointers;
3331 if (numNormalPointers > 2)
3332 return PointerDeclaratorKind::MultiLevelPointer;
3334 type = ptrType->getPointeeType();
3335 ++numTypeSpecifierPointers;
3339 // Decompose block pointers.
3340 if (type->getAs<BlockPointerType>()) {
3341 return numNormalPointers > 0 ? PointerDeclaratorKind::MultiLevelPointer
3342 : PointerDeclaratorKind::SingleLevelPointer;
3345 // Decompose member pointers.
3346 if (type->getAs<MemberPointerType>()) {
3347 return numNormalPointers > 0 ? PointerDeclaratorKind::MultiLevelPointer
3348 : PointerDeclaratorKind::SingleLevelPointer;
3351 // Look at Objective-C object pointers.
3352 if (auto objcObjectPtr = type->getAs<ObjCObjectPointerType>()) {
3353 ++numNormalPointers;
3354 ++numTypeSpecifierPointers;
3356 // If this is NSError**, report that.
3357 if (auto objcClassDecl = objcObjectPtr->getInterfaceDecl()) {
3358 if (objcClassDecl->getIdentifier() == S.getNSErrorIdent() &&
3359 numNormalPointers == 2 && numTypeSpecifierPointers < 2) {
3360 return PointerDeclaratorKind::NSErrorPointerPointer;
3367 // Look at Objective-C class types.
3368 if (auto objcClass = type->getAs<ObjCInterfaceType>()) {
3369 if (objcClass->getInterface()->getIdentifier() == S.getNSErrorIdent()) {
3370 if (numNormalPointers == 2 && numTypeSpecifierPointers < 2)
3371 return PointerDeclaratorKind::NSErrorPointerPointer;
3377 // If at this point we haven't seen a pointer, we won't see one.
3378 if (numNormalPointers == 0)
3379 return PointerDeclaratorKind::NonPointer;
3381 if (auto recordType = type->getAs<RecordType>()) {
3382 RecordDecl *recordDecl = recordType->getDecl();
3384 bool isCFError = false;
3386 // If we already know about CFError, test it directly.
3387 isCFError = (S.CFError == recordDecl);
3389 // Check whether this is CFError, which we identify based on its bridge
3391 if (recordDecl->getTagKind() == TTK_Struct && numNormalPointers > 0) {
3392 if (auto bridgeAttr = recordDecl->getAttr<ObjCBridgeAttr>()) {
3393 if (bridgeAttr->getBridgedType() == S.getNSErrorIdent()) {
3394 S.CFError = recordDecl;
3401 // If this is CFErrorRef*, report it as such.
3402 if (isCFError && numNormalPointers == 2 && numTypeSpecifierPointers < 2) {
3403 return PointerDeclaratorKind::CFErrorRefPointer;
3411 switch (numNormalPointers) {
3413 return PointerDeclaratorKind::NonPointer;
3416 return PointerDeclaratorKind::SingleLevelPointer;
3419 return PointerDeclaratorKind::MaybePointerToCFRef;
3422 return PointerDeclaratorKind::MultiLevelPointer;
3426 static FileID getNullabilityCompletenessCheckFileID(Sema &S,
3427 SourceLocation loc) {
3428 // If we're anywhere in a function, method, or closure context, don't perform
3429 // completeness checks.
3430 for (DeclContext *ctx = S.CurContext; ctx; ctx = ctx->getParent()) {
3431 if (ctx->isFunctionOrMethod())
3434 if (ctx->isFileContext())
3438 // We only care about the expansion location.
3439 loc = S.SourceMgr.getExpansionLoc(loc);
3440 FileID file = S.SourceMgr.getFileID(loc);
3441 if (file.isInvalid())
3444 // Retrieve file information.
3445 bool invalid = false;
3446 const SrcMgr::SLocEntry &sloc = S.SourceMgr.getSLocEntry(file, &invalid);
3447 if (invalid || !sloc.isFile())
3450 // We don't want to perform completeness checks on the main file or in
3452 const SrcMgr::FileInfo &fileInfo = sloc.getFile();
3453 if (fileInfo.getIncludeLoc().isInvalid())
3455 if (fileInfo.getFileCharacteristic() != SrcMgr::C_User &&
3456 S.Diags.getSuppressSystemWarnings()) {
3463 /// Creates a fix-it to insert a C-style nullability keyword at \p pointerLoc,
3464 /// taking into account whitespace before and after.
3465 static void fixItNullability(Sema &S, DiagnosticBuilder &Diag,
3466 SourceLocation PointerLoc,
3467 NullabilityKind Nullability) {
3468 assert(PointerLoc.isValid());
3469 if (PointerLoc.isMacroID())
3472 SourceLocation FixItLoc = S.getLocForEndOfToken(PointerLoc);
3473 if (!FixItLoc.isValid() || FixItLoc == PointerLoc)
3476 const char *NextChar = S.SourceMgr.getCharacterData(FixItLoc);
3480 SmallString<32> InsertionTextBuf{" "};
3481 InsertionTextBuf += getNullabilitySpelling(Nullability);
3482 InsertionTextBuf += " ";
3483 StringRef InsertionText = InsertionTextBuf.str();
3485 if (isWhitespace(*NextChar)) {
3486 InsertionText = InsertionText.drop_back();
3487 } else if (NextChar[-1] == '[') {
3488 if (NextChar[0] == ']')
3489 InsertionText = InsertionText.drop_back().drop_front();
3491 InsertionText = InsertionText.drop_front();
3492 } else if (!isIdentifierBody(NextChar[0], /*allow dollar*/true) &&
3493 !isIdentifierBody(NextChar[-1], /*allow dollar*/true)) {
3494 InsertionText = InsertionText.drop_back().drop_front();
3497 Diag << FixItHint::CreateInsertion(FixItLoc, InsertionText);
3500 static void emitNullabilityConsistencyWarning(Sema &S,
3501 SimplePointerKind PointerKind,
3502 SourceLocation PointerLoc) {
3503 assert(PointerLoc.isValid());
3505 if (PointerKind == SimplePointerKind::Array) {
3506 S.Diag(PointerLoc, diag::warn_nullability_missing_array);
3508 S.Diag(PointerLoc, diag::warn_nullability_missing)
3509 << static_cast<unsigned>(PointerKind);
3512 if (PointerLoc.isMacroID())
3515 auto addFixIt = [&](NullabilityKind Nullability) {
3516 auto Diag = S.Diag(PointerLoc, diag::note_nullability_fix_it);
3517 Diag << static_cast<unsigned>(Nullability);
3518 Diag << static_cast<unsigned>(PointerKind);
3519 fixItNullability(S, Diag, PointerLoc, Nullability);
3521 addFixIt(NullabilityKind::Nullable);
3522 addFixIt(NullabilityKind::NonNull);
3525 /// Complains about missing nullability if the file containing \p pointerLoc
3526 /// has other uses of nullability (either the keywords or the \c assume_nonnull
3529 /// If the file has \e not seen other uses of nullability, this particular
3530 /// pointer is saved for possible later diagnosis. See recordNullabilitySeen().
3531 static void checkNullabilityConsistency(Sema &S,
3532 SimplePointerKind pointerKind,
3533 SourceLocation pointerLoc) {
3534 // Determine which file we're performing consistency checking for.
3535 FileID file = getNullabilityCompletenessCheckFileID(S, pointerLoc);
3536 if (file.isInvalid())
3539 // If we haven't seen any type nullability in this file, we won't warn now
3541 FileNullability &fileNullability = S.NullabilityMap[file];
3542 if (!fileNullability.SawTypeNullability) {
3543 // If this is the first pointer declarator in the file, and the appropriate
3544 // warning is on, record it in case we need to diagnose it retroactively.
3545 diag::kind diagKind;
3546 if (pointerKind == SimplePointerKind::Array)
3547 diagKind = diag::warn_nullability_missing_array;
3549 diagKind = diag::warn_nullability_missing;
3551 if (fileNullability.PointerLoc.isInvalid() &&
3552 !S.Context.getDiagnostics().isIgnored(diagKind, pointerLoc)) {
3553 fileNullability.PointerLoc = pointerLoc;
3554 fileNullability.PointerKind = static_cast<unsigned>(pointerKind);
3560 // Complain about missing nullability.
3561 emitNullabilityConsistencyWarning(S, pointerKind, pointerLoc);
3564 /// Marks that a nullability feature has been used in the file containing
3567 /// If this file already had pointer types in it that were missing nullability,
3568 /// the first such instance is retroactively diagnosed.
3570 /// \sa checkNullabilityConsistency
3571 static void recordNullabilitySeen(Sema &S, SourceLocation loc) {
3572 FileID file = getNullabilityCompletenessCheckFileID(S, loc);
3573 if (file.isInvalid())
3576 FileNullability &fileNullability = S.NullabilityMap[file];
3577 if (fileNullability.SawTypeNullability)
3579 fileNullability.SawTypeNullability = true;
3581 // If we haven't seen any type nullability before, now we have. Retroactively
3582 // diagnose the first unannotated pointer, if there was one.
3583 if (fileNullability.PointerLoc.isInvalid())
3586 auto kind = static_cast<SimplePointerKind>(fileNullability.PointerKind);
3587 emitNullabilityConsistencyWarning(S, kind, fileNullability.PointerLoc);
3590 /// Returns true if any of the declarator chunks before \p endIndex include a
3591 /// level of indirection: array, pointer, reference, or pointer-to-member.
3593 /// Because declarator chunks are stored in outer-to-inner order, testing
3594 /// every chunk before \p endIndex is testing all chunks that embed the current
3595 /// chunk as part of their type.
3597 /// It is legal to pass the result of Declarator::getNumTypeObjects() as the
3598 /// end index, in which case all chunks are tested.
3599 static bool hasOuterPointerLikeChunk(const Declarator &D, unsigned endIndex) {
3600 unsigned i = endIndex;
3602 // Walk outwards along the declarator chunks.
3604 const DeclaratorChunk &DC = D.getTypeObject(i);
3606 case DeclaratorChunk::Paren:
3608 case DeclaratorChunk::Array:
3609 case DeclaratorChunk::Pointer:
3610 case DeclaratorChunk::Reference:
3611 case DeclaratorChunk::MemberPointer:
3613 case DeclaratorChunk::Function:
3614 case DeclaratorChunk::BlockPointer:
3615 case DeclaratorChunk::Pipe:
3616 // These are invalid anyway, so just ignore.
3623 static TypeSourceInfo *GetFullTypeForDeclarator(TypeProcessingState &state,
3624 QualType declSpecType,
3625 TypeSourceInfo *TInfo) {
3626 // The TypeSourceInfo that this function returns will not be a null type.
3627 // If there is an error, this function will fill in a dummy type as fallback.
3628 QualType T = declSpecType;
3629 Declarator &D = state.getDeclarator();
3630 Sema &S = state.getSema();
3631 ASTContext &Context = S.Context;
3632 const LangOptions &LangOpts = S.getLangOpts();
3634 // The name we're declaring, if any.
3635 DeclarationName Name;
3636 if (D.getIdentifier())
3637 Name = D.getIdentifier();
3639 // Does this declaration declare a typedef-name?
3640 bool IsTypedefName =
3641 D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef ||
3642 D.getContext() == Declarator::AliasDeclContext ||
3643 D.getContext() == Declarator::AliasTemplateContext;
3645 // Does T refer to a function type with a cv-qualifier or a ref-qualifier?
3646 bool IsQualifiedFunction = T->isFunctionProtoType() &&
3647 (T->castAs<FunctionProtoType>()->getTypeQuals() != 0 ||
3648 T->castAs<FunctionProtoType>()->getRefQualifier() != RQ_None);
3650 // If T is 'decltype(auto)', the only declarators we can have are parens
3651 // and at most one function declarator if this is a function declaration.
3652 // If T is a deduced class template specialization type, we can have no
3653 // declarator chunks at all.
3654 if (auto *DT = T->getAs<DeducedType>()) {
3655 const AutoType *AT = T->getAs<AutoType>();
3656 bool IsClassTemplateDeduction = isa<DeducedTemplateSpecializationType>(DT);
3657 if ((AT && AT->isDecltypeAuto()) || IsClassTemplateDeduction) {
3658 for (unsigned I = 0, E = D.getNumTypeObjects(); I != E; ++I) {
3659 unsigned Index = E - I - 1;
3660 DeclaratorChunk &DeclChunk = D.getTypeObject(Index);
3661 unsigned DiagId = IsClassTemplateDeduction
3662 ? diag::err_deduced_class_template_compound_type
3663 : diag::err_decltype_auto_compound_type;
3664 unsigned DiagKind = 0;
3665 switch (DeclChunk.Kind) {
3666 case DeclaratorChunk::Paren:
3667 // FIXME: Rejecting this is a little silly.
3668 if (IsClassTemplateDeduction) {
3673 case DeclaratorChunk::Function: {
3674 if (IsClassTemplateDeduction) {
3679 if (D.isFunctionDeclarationContext() &&
3680 D.isFunctionDeclarator(FnIndex) && FnIndex == Index)
3682 DiagId = diag::err_decltype_auto_function_declarator_not_declaration;
3685 case DeclaratorChunk::Pointer:
3686 case DeclaratorChunk::BlockPointer:
3687 case DeclaratorChunk::MemberPointer:
3690 case DeclaratorChunk::Reference:
3693 case DeclaratorChunk::Array:
3696 case DeclaratorChunk::Pipe:
3700 S.Diag(DeclChunk.Loc, DiagId) << DiagKind;
3701 D.setInvalidType(true);
3707 // Determine whether we should infer _Nonnull on pointer types.
3708 Optional<NullabilityKind> inferNullability;
3709 bool inferNullabilityCS = false;
3710 bool inferNullabilityInnerOnly = false;
3711 bool inferNullabilityInnerOnlyComplete = false;
3713 // Are we in an assume-nonnull region?
3714 bool inAssumeNonNullRegion = false;
3715 SourceLocation assumeNonNullLoc = S.PP.getPragmaAssumeNonNullLoc();
3716 if (assumeNonNullLoc.isValid()) {
3717 inAssumeNonNullRegion = true;
3718 recordNullabilitySeen(S, assumeNonNullLoc);
3721 // Whether to complain about missing nullability specifiers or not.
3725 /// Complain on the inner pointers (but not the outermost
3728 /// Complain about any pointers that don't have nullability
3729 /// specified or inferred.
3731 } complainAboutMissingNullability = CAMN_No;
3732 unsigned NumPointersRemaining = 0;
3733 auto complainAboutInferringWithinChunk = PointerWrappingDeclaratorKind::None;
3735 if (IsTypedefName) {
3736 // For typedefs, we do not infer any nullability (the default),
3737 // and we only complain about missing nullability specifiers on
3739 complainAboutMissingNullability = CAMN_InnerPointers;
3741 if (T->canHaveNullability(/*ResultIfUnknown*/false) &&
3742 !T->getNullability(S.Context)) {
3743 // Note that we allow but don't require nullability on dependent types.
3744 ++NumPointersRemaining;
3747 for (unsigned i = 0, n = D.getNumTypeObjects(); i != n; ++i) {
3748 DeclaratorChunk &chunk = D.getTypeObject(i);
3749 switch (chunk.Kind) {
3750 case DeclaratorChunk::Array:
3751 case DeclaratorChunk::Function:
3752 case DeclaratorChunk::Pipe:
3755 case DeclaratorChunk::BlockPointer:
3756 case DeclaratorChunk::MemberPointer:
3757 ++NumPointersRemaining;
3760 case DeclaratorChunk::Paren:
3761 case DeclaratorChunk::Reference:
3764 case DeclaratorChunk::Pointer:
3765 ++NumPointersRemaining;
3770 bool isFunctionOrMethod = false;
3771 switch (auto context = state.getDeclarator().getContext()) {
3772 case Declarator::ObjCParameterContext:
3773 case Declarator::ObjCResultContext:
3774 case Declarator::PrototypeContext:
3775 case Declarator::TrailingReturnContext:
3776 isFunctionOrMethod = true;
3779 case Declarator::MemberContext:
3780 if (state.getDeclarator().isObjCIvar() && !isFunctionOrMethod) {
3781 complainAboutMissingNullability = CAMN_No;
3785 // Weak properties are inferred to be nullable.
3786 if (state.getDeclarator().isObjCWeakProperty() && inAssumeNonNullRegion) {
3787 inferNullability = NullabilityKind::Nullable;
3793 case Declarator::FileContext:
3794 case Declarator::KNRTypeListContext: {
3795 complainAboutMissingNullability = CAMN_Yes;
3797 // Nullability inference depends on the type and declarator.
3798 auto wrappingKind = PointerWrappingDeclaratorKind::None;
3799 switch (classifyPointerDeclarator(S, T, D, wrappingKind)) {
3800 case PointerDeclaratorKind::NonPointer:
3801 case PointerDeclaratorKind::MultiLevelPointer:
3802 // Cannot infer nullability.
3805 case PointerDeclaratorKind::SingleLevelPointer:
3806 // Infer _Nonnull if we are in an assumes-nonnull region.
3807 if (inAssumeNonNullRegion) {
3808 complainAboutInferringWithinChunk = wrappingKind;
3809 inferNullability = NullabilityKind::NonNull;
3810 inferNullabilityCS = (context == Declarator::ObjCParameterContext ||
3811 context == Declarator::ObjCResultContext);
3815 case PointerDeclaratorKind::CFErrorRefPointer:
3816 case PointerDeclaratorKind::NSErrorPointerPointer:
3817 // Within a function or method signature, infer _Nullable at both
3819 if (isFunctionOrMethod && inAssumeNonNullRegion)
3820 inferNullability = NullabilityKind::Nullable;
3823 case PointerDeclaratorKind::MaybePointerToCFRef:
3824 if (isFunctionOrMethod) {
3825 // On pointer-to-pointer parameters marked cf_returns_retained or
3826 // cf_returns_not_retained, if the outer pointer is explicit then
3827 // infer the inner pointer as _Nullable.
3828 auto hasCFReturnsAttr = [](const AttributeList *NextAttr) -> bool {
3830 if (NextAttr->getKind() == AttributeList::AT_CFReturnsRetained ||
3831 NextAttr->getKind() == AttributeList::AT_CFReturnsNotRetained)
3833 NextAttr = NextAttr->getNext();
3837 if (const auto *InnermostChunk = D.getInnermostNonParenChunk()) {
3838 if (hasCFReturnsAttr(D.getAttributes()) ||
3839 hasCFReturnsAttr(InnermostChunk->getAttrs()) ||
3840 hasCFReturnsAttr(D.getDeclSpec().getAttributes().getList())) {
3841 inferNullability = NullabilityKind::Nullable;
3842 inferNullabilityInnerOnly = true;
3851 case Declarator::ConversionIdContext:
3852 complainAboutMissingNullability = CAMN_Yes;
3855 case Declarator::AliasDeclContext:
3856 case Declarator::AliasTemplateContext:
3857 case Declarator::BlockContext:
3858 case Declarator::BlockLiteralContext:
3859 case Declarator::ConditionContext:
3860 case Declarator::CXXCatchContext:
3861 case Declarator::CXXNewContext:
3862 case Declarator::ForContext:
3863 case Declarator::InitStmtContext:
3864 case Declarator::LambdaExprContext:
3865 case Declarator::LambdaExprParameterContext:
3866 case Declarator::ObjCCatchContext:
3867 case Declarator::TemplateParamContext:
3868 case Declarator::TemplateTypeArgContext:
3869 case Declarator::TypeNameContext:
3870 case Declarator::FunctionalCastContext:
3871 // Don't infer in these contexts.
3876 // Local function that returns true if its argument looks like a va_list.
3877 auto isVaList = [&S](QualType T) -> bool {
3878 auto *typedefTy = T->getAs<TypedefType>();
3881 TypedefDecl *vaListTypedef = S.Context.getBuiltinVaListDecl();
3883 if (typedefTy->getDecl() == vaListTypedef)
3885 if (auto *name = typedefTy->getDecl()->getIdentifier())
3886 if (name->isStr("va_list"))
3888 typedefTy = typedefTy->desugar()->getAs<TypedefType>();
3889 } while (typedefTy);
3893 // Local function that checks the nullability for a given pointer declarator.
3894 // Returns true if _Nonnull was inferred.
3895 auto inferPointerNullability = [&](SimplePointerKind pointerKind,
3896 SourceLocation pointerLoc,
3897 AttributeList *&attrs) -> AttributeList * {
3898 // We've seen a pointer.
3899 if (NumPointersRemaining > 0)
3900 --NumPointersRemaining;
3902 // If a nullability attribute is present, there's nothing to do.
3903 if (hasNullabilityAttr(attrs))
3906 // If we're supposed to infer nullability, do so now.
3907 if (inferNullability && !inferNullabilityInnerOnlyComplete) {
3908 AttributeList::Syntax syntax
3909 = inferNullabilityCS ? AttributeList::AS_ContextSensitiveKeyword
3910 : AttributeList::AS_Keyword;
3911 AttributeList *nullabilityAttr = state.getDeclarator().getAttributePool()
3913 S.getNullabilityKeyword(
3915 SourceRange(pointerLoc),
3916 nullptr, SourceLocation(),
3917 nullptr, 0, syntax);
3919 spliceAttrIntoList(*nullabilityAttr, attrs);
3921 if (inferNullabilityCS) {
3922 state.getDeclarator().getMutableDeclSpec().getObjCQualifiers()
3923 ->setObjCDeclQualifier(ObjCDeclSpec::DQ_CSNullability);
3926 if (pointerLoc.isValid() &&
3927 complainAboutInferringWithinChunk !=
3928 PointerWrappingDeclaratorKind::None) {
3930 S.Diag(pointerLoc, diag::warn_nullability_inferred_on_nested_type);
3931 Diag << static_cast<int>(complainAboutInferringWithinChunk);
3932 fixItNullability(S, Diag, pointerLoc, NullabilityKind::NonNull);
3935 if (inferNullabilityInnerOnly)
3936 inferNullabilityInnerOnlyComplete = true;
3937 return nullabilityAttr;
3940 // If we're supposed to complain about missing nullability, do so
3941 // now if it's truly missing.
3942 switch (complainAboutMissingNullability) {
3946 case CAMN_InnerPointers:
3947 if (NumPointersRemaining == 0)
3952 checkNullabilityConsistency(S, pointerKind, pointerLoc);
3957 // If the type itself could have nullability but does not, infer pointer
3958 // nullability and perform consistency checking.
3959 if (S.CodeSynthesisContexts.empty()) {
3960 if (T->canHaveNullability(/*ResultIfUnknown*/false) &&
3961 !T->getNullability(S.Context)) {
3963 // Record that we've seen a pointer, but do nothing else.
3964 if (NumPointersRemaining > 0)
3965 --NumPointersRemaining;
3967 SimplePointerKind pointerKind = SimplePointerKind::Pointer;
3968 if (T->isBlockPointerType())
3969 pointerKind = SimplePointerKind::BlockPointer;
3970 else if (T->isMemberPointerType())
3971 pointerKind = SimplePointerKind::MemberPointer;
3973 if (auto *attr = inferPointerNullability(
3974 pointerKind, D.getDeclSpec().getTypeSpecTypeLoc(),
3975 D.getMutableDeclSpec().getAttributes().getListRef())) {
3976 T = Context.getAttributedType(
3977 AttributedType::getNullabilityAttrKind(*inferNullability),T,T);
3978 attr->setUsedAsTypeAttr();
3983 if (complainAboutMissingNullability == CAMN_Yes &&
3984 T->isArrayType() && !T->getNullability(S.Context) && !isVaList(T) &&
3985 D.isPrototypeContext() &&
3986 !hasOuterPointerLikeChunk(D, D.getNumTypeObjects())) {
3987 checkNullabilityConsistency(S, SimplePointerKind::Array,
3988 D.getDeclSpec().getTypeSpecTypeLoc());
3992 // Walk the DeclTypeInfo, building the recursive type as we go.
3993 // DeclTypeInfos are ordered from the identifier out, which is
3994 // opposite of what we want :).
3995 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) {
3996 unsigned chunkIndex = e - i - 1;
3997 state.setCurrentChunkIndex(chunkIndex);
3998 DeclaratorChunk &DeclType = D.getTypeObject(chunkIndex);
3999 IsQualifiedFunction &= DeclType.Kind == DeclaratorChunk::Paren;
4000 switch (DeclType.Kind) {
4001 case DeclaratorChunk::Paren:
4002 T = S.BuildParenType(T);
4004 case DeclaratorChunk::BlockPointer:
4005 // If blocks are disabled, emit an error.
4006 if (!LangOpts.Blocks)
4007 S.Diag(DeclType.Loc, diag::err_blocks_disable) << LangOpts.OpenCL;
4009 // Handle pointer nullability.
4010 inferPointerNullability(SimplePointerKind::BlockPointer,
4011 DeclType.Loc, DeclType.getAttrListRef());
4013 T = S.BuildBlockPointerType(T, D.getIdentifierLoc(), Name);
4014 if (DeclType.Cls.TypeQuals || LangOpts.OpenCL) {
4015 // OpenCL v2.0, s6.12.5 - Block variable declarations are implicitly
4016 // qualified with const.
4017 if (LangOpts.OpenCL)
4018 DeclType.Cls.TypeQuals |= DeclSpec::TQ_const;
4019 T = S.BuildQualifiedType(T, DeclType.Loc, DeclType.Cls.TypeQuals);
4022 case DeclaratorChunk::Pointer:
4023 // Verify that we're not building a pointer to pointer to function with
4024 // exception specification.
4025 if (LangOpts.CPlusPlus && S.CheckDistantExceptionSpec(T)) {
4026 S.Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec);
4027 D.setInvalidType(true);
4028 // Build the type anyway.
4031 // Handle pointer nullability
4032 inferPointerNullability(SimplePointerKind::Pointer, DeclType.Loc,
4033 DeclType.getAttrListRef());
4035 if (LangOpts.ObjC1 && T->getAs<ObjCObjectType>()) {
4036 T = Context.getObjCObjectPointerType(T);
4037 if (DeclType.Ptr.TypeQuals)
4038 T = S.BuildQualifiedType(T, DeclType.Loc, DeclType.Ptr.TypeQuals);
4042 // OpenCL v2.0 s6.9b - Pointer to image/sampler cannot be used.
4043 // OpenCL v2.0 s6.13.16.1 - Pointer to pipe cannot be used.
4044 // OpenCL v2.0 s6.12.5 - Pointers to Blocks are not allowed.
4045 if (LangOpts.OpenCL) {
4046 if (T->isImageType() || T->isSamplerT() || T->isPipeType() ||
4047 T->isBlockPointerType()) {
4048 S.Diag(D.getIdentifierLoc(), diag::err_opencl_pointer_to_type) << T;
4049 D.setInvalidType(true);
4053 T = S.BuildPointerType(T, DeclType.Loc, Name);
4054 if (DeclType.Ptr.TypeQuals)
4055 T = S.BuildQualifiedType(T, DeclType.Loc, DeclType.Ptr.TypeQuals);
4057 case DeclaratorChunk::Reference: {
4058 // Verify that we're not building a reference to pointer to function with
4059 // exception specification.
4060 if (LangOpts.CPlusPlus && S.CheckDistantExceptionSpec(T)) {
4061 S.Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec);
4062 D.setInvalidType(true);
4063 // Build the type anyway.
4065 T = S.BuildReferenceType(T, DeclType.Ref.LValueRef, DeclType.Loc, Name);
4067 if (DeclType.Ref.HasRestrict)
4068 T = S.BuildQualifiedType(T, DeclType.Loc, Qualifiers::Restrict);
4071 case DeclaratorChunk::Array: {
4072 // Verify that we're not building an array of pointers to function with
4073 // exception specification.
4074 if (LangOpts.CPlusPlus && S.CheckDistantExceptionSpec(T)) {
4075 S.Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec);
4076 D.setInvalidType(true);
4077 // Build the type anyway.
4079 DeclaratorChunk::ArrayTypeInfo &ATI = DeclType.Arr;
4080 Expr *ArraySize = static_cast<Expr*>(ATI.NumElts);
4081 ArrayType::ArraySizeModifier ASM;
4083 ASM = ArrayType::Star;
4084 else if (ATI.hasStatic)
4085 ASM = ArrayType::Static;
4087 ASM = ArrayType::Normal;
4088 if (ASM == ArrayType::Star && !D.isPrototypeContext()) {
4089 // FIXME: This check isn't quite right: it allows star in prototypes
4090 // for function definitions, and disallows some edge cases detailed
4091 // in http://gcc.gnu.org/ml/gcc-patches/2009-02/msg00133.html
4092 S.Diag(DeclType.Loc, diag::err_array_star_outside_prototype);
4093 ASM = ArrayType::Normal;
4094 D.setInvalidType(true);
4097 // C99 6.7.5.2p1: The optional type qualifiers and the keyword static
4098 // shall appear only in a declaration of a function parameter with an
4100 if (ASM == ArrayType::Static || ATI.TypeQuals) {
4101 if (!(D.isPrototypeContext() ||
4102 D.getContext() == Declarator::KNRTypeListContext)) {
4103 S.Diag(DeclType.Loc, diag::err_array_static_outside_prototype) <<
4104 (ASM == ArrayType::Static ? "'static'" : "type qualifier");
4105 // Remove the 'static' and the type qualifiers.
4106 if (ASM == ArrayType::Static)
4107 ASM = ArrayType::Normal;
4109 D.setInvalidType(true);
4112 // C99 6.7.5.2p1: ... and then only in the outermost array type
4114 if (hasOuterPointerLikeChunk(D, chunkIndex)) {
4115 S.Diag(DeclType.Loc, diag::err_array_static_not_outermost) <<
4116 (ASM == ArrayType::Static ? "'static'" : "type qualifier");
4117 if (ASM == ArrayType::Static)
4118 ASM = ArrayType::Normal;
4120 D.setInvalidType(true);
4123 const AutoType *AT = T->getContainedAutoType();
4124 // Allow arrays of auto if we are a generic lambda parameter.
4125 // i.e. [](auto (&array)[5]) { return array[0]; }; OK
4126 if (AT && D.getContext() != Declarator::LambdaExprParameterContext) {
4127 // We've already diagnosed this for decltype(auto).
4128 if (!AT->isDecltypeAuto())
4129 S.Diag(DeclType.Loc, diag::err_illegal_decl_array_of_auto)
4130 << getPrintableNameForEntity(Name) << T;
4135 // Array parameters can be marked nullable as well, although it's not
4136 // necessary if they're marked 'static'.
4137 if (complainAboutMissingNullability == CAMN_Yes &&
4138 !hasNullabilityAttr(DeclType.getAttrs()) &&
4139 ASM != ArrayType::Static &&
4140 D.isPrototypeContext() &&
4141 !hasOuterPointerLikeChunk(D, chunkIndex)) {
4142 checkNullabilityConsistency(S, SimplePointerKind::Array, DeclType.Loc);
4145 T = S.BuildArrayType(T, ASM, ArraySize, ATI.TypeQuals,
4146 SourceRange(DeclType.Loc, DeclType.EndLoc), Name);
4149 case DeclaratorChunk::Function: {
4150 // If the function declarator has a prototype (i.e. it is not () and
4151 // does not have a K&R-style identifier list), then the arguments are part
4152 // of the type, otherwise the argument list is ().
4153 const DeclaratorChunk::FunctionTypeInfo &FTI = DeclType.Fun;
4154 IsQualifiedFunction = FTI.TypeQuals || FTI.hasRefQualifier();
4156 // Check for auto functions and trailing return type and adjust the
4157 // return type accordingly.
4158 if (!D.isInvalidType()) {
4159 // trailing-return-type is only required if we're declaring a function,
4160 // and not, for instance, a pointer to a function.
4161 if (D.getDeclSpec().hasAutoTypeSpec() &&
4162 !FTI.hasTrailingReturnType() && chunkIndex == 0 &&
4163 !S.getLangOpts().CPlusPlus14) {
4164 S.Diag(D.getDeclSpec().getTypeSpecTypeLoc(),
4165 D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_auto
4166 ? diag::err_auto_missing_trailing_return
4167 : diag::err_deduced_return_type);
4169 D.setInvalidType(true);
4170 } else if (FTI.hasTrailingReturnType()) {
4171 // T must be exactly 'auto' at this point. See CWG issue 681.
4172 if (isa<ParenType>(T)) {
4173 S.Diag(D.getLocStart(),
4174 diag::err_trailing_return_in_parens)
4175 << T << D.getSourceRange();
4176 D.setInvalidType(true);
4177 } else if (D.getName().getKind() ==
4178 UnqualifiedId::IK_DeductionGuideName) {
4179 if (T != Context.DependentTy) {
4180 S.Diag(D.getDeclSpec().getLocStart(),
4181 diag::err_deduction_guide_with_complex_decl)
4182 << D.getSourceRange();
4183 D.setInvalidType(true);
4185 } else if (D.getContext() != Declarator::LambdaExprContext &&
4186 (T.hasQualifiers() || !isa<AutoType>(T) ||
4187 cast<AutoType>(T)->getKeyword() !=
4188 AutoTypeKeyword::Auto)) {
4189 S.Diag(D.getDeclSpec().getTypeSpecTypeLoc(),
4190 diag::err_trailing_return_without_auto)
4191 << T << D.getDeclSpec().getSourceRange();
4192 D.setInvalidType(true);
4194 T = S.GetTypeFromParser(FTI.getTrailingReturnType(), &TInfo);
4196 // An error occurred parsing the trailing return type.
4198 D.setInvalidType(true);
4203 // C99 6.7.5.3p1: The return type may not be a function or array type.
4204 // For conversion functions, we'll diagnose this particular error later.
4205 if (!D.isInvalidType() && (T->isArrayType() || T->isFunctionType()) &&
4206 (D.getName().getKind() != UnqualifiedId::IK_ConversionFunctionId)) {
4207 unsigned diagID = diag::err_func_returning_array_function;
4208 // Last processing chunk in block context means this function chunk
4209 // represents the block.
4210 if (chunkIndex == 0 &&
4211 D.getContext() == Declarator::BlockLiteralContext)
4212 diagID = diag::err_block_returning_array_function;
4213 S.Diag(DeclType.Loc, diagID) << T->isFunctionType() << T;
4215 D.setInvalidType(true);
4218 // Do not allow returning half FP value.
4219 // FIXME: This really should be in BuildFunctionType.
4220 if (T->isHalfType()) {
4221 if (S.getLangOpts().OpenCL) {
4222 if (!S.getOpenCLOptions().isEnabled("cl_khr_fp16")) {
4223 S.Diag(D.getIdentifierLoc(), diag::err_opencl_invalid_return)
4224 << T << 0 /*pointer hint*/;
4225 D.setInvalidType(true);
4227 } else if (!S.getLangOpts().HalfArgsAndReturns) {
4228 S.Diag(D.getIdentifierLoc(),
4229 diag::err_parameters_retval_cannot_have_fp16_type) << 1;
4230 D.setInvalidType(true);
4234 if (LangOpts.OpenCL) {
4235 // OpenCL v2.0 s6.12.5 - A block cannot be the return value of a
4237 if (T->isBlockPointerType() || T->isImageType() || T->isSamplerT() ||
4239 S.Diag(D.getIdentifierLoc(), diag::err_opencl_invalid_return)
4240 << T << 1 /*hint off*/;
4241 D.setInvalidType(true);
4243 // OpenCL doesn't support variadic functions and blocks
4244 // (s6.9.e and s6.12.5 OpenCL v2.0) except for printf.
4245 // We also allow here any toolchain reserved identifiers.
4246 if (FTI.isVariadic &&
4247 !(D.getIdentifier() &&
4248 ((D.getIdentifier()->getName() == "printf" &&
4249 LangOpts.OpenCLVersion >= 120) ||
4250 D.getIdentifier()->getName().startswith("__")))) {
4251 S.Diag(D.getIdentifierLoc(), diag::err_opencl_variadic_function);
4252 D.setInvalidType(true);
4256 // Methods cannot return interface types. All ObjC objects are
4257 // passed by reference.
4258 if (T->isObjCObjectType()) {
4259 SourceLocation DiagLoc, FixitLoc;
4261 DiagLoc = TInfo->getTypeLoc().getLocStart();
4262 FixitLoc = S.getLocForEndOfToken(TInfo->getTypeLoc().getLocEnd());
4264 DiagLoc = D.getDeclSpec().getTypeSpecTypeLoc();
4265 FixitLoc = S.getLocForEndOfToken(D.getDeclSpec().getLocEnd());
4267 S.Diag(DiagLoc, diag::err_object_cannot_be_passed_returned_by_value)
4269 << FixItHint::CreateInsertion(FixitLoc, "*");
4271 T = Context.getObjCObjectPointerType(T);
4274 TLB.pushFullCopy(TInfo->getTypeLoc());
4275 ObjCObjectPointerTypeLoc TLoc = TLB.push<ObjCObjectPointerTypeLoc>(T);
4276 TLoc.setStarLoc(FixitLoc);
4277 TInfo = TLB.getTypeSourceInfo(Context, T);
4280 D.setInvalidType(true);
4283 // cv-qualifiers on return types are pointless except when the type is a
4284 // class type in C++.
4285 if ((T.getCVRQualifiers() || T->isAtomicType()) &&
4286 !(S.getLangOpts().CPlusPlus &&
4287 (T->isDependentType() || T->isRecordType()))) {
4288 if (T->isVoidType() && !S.getLangOpts().CPlusPlus &&
4289 D.getFunctionDefinitionKind() == FDK_Definition) {
4290 // [6.9.1/3] qualified void return is invalid on a C
4291 // function definition. Apparently ok on declarations and
4292 // in C++ though (!)
4293 S.Diag(DeclType.Loc, diag::err_func_returning_qualified_void) << T;
4295 diagnoseRedundantReturnTypeQualifiers(S, T, D, chunkIndex);
4298 // Objective-C ARC ownership qualifiers are ignored on the function
4299 // return type (by type canonicalization). Complain if this attribute
4300 // was written here.
4301 if (T.getQualifiers().hasObjCLifetime()) {
4302 SourceLocation AttrLoc;
4303 if (chunkIndex + 1 < D.getNumTypeObjects()) {
4304 DeclaratorChunk ReturnTypeChunk = D.getTypeObject(chunkIndex + 1);
4305 for (const AttributeList *Attr = ReturnTypeChunk.getAttrs();
4306 Attr; Attr = Attr->getNext()) {
4307 if (Attr->getKind() == AttributeList::AT_ObjCOwnership) {
4308 AttrLoc = Attr->getLoc();
4313 if (AttrLoc.isInvalid()) {
4314 for (const AttributeList *Attr
4315 = D.getDeclSpec().getAttributes().getList();
4316 Attr; Attr = Attr->getNext()) {
4317 if (Attr->getKind() == AttributeList::AT_ObjCOwnership) {
4318 AttrLoc = Attr->getLoc();
4324 if (AttrLoc.isValid()) {
4325 // The ownership attributes are almost always written via
4327 // __strong/__weak/__autoreleasing/__unsafe_unretained.
4328 if (AttrLoc.isMacroID())
4329 AttrLoc = S.SourceMgr.getImmediateExpansionRange(AttrLoc).first;
4331 S.Diag(AttrLoc, diag::warn_arc_lifetime_result_type)
4332 << T.getQualifiers().getObjCLifetime();
4336 if (LangOpts.CPlusPlus && D.getDeclSpec().hasTagDefinition()) {
4338 // Types shall not be defined in return or parameter types.
4339 TagDecl *Tag = cast<TagDecl>(D.getDeclSpec().getRepAsDecl());
4340 S.Diag(Tag->getLocation(), diag::err_type_defined_in_result_type)
4341 << Context.getTypeDeclType(Tag);
4344 // Exception specs are not allowed in typedefs. Complain, but add it
4346 if (IsTypedefName && FTI.getExceptionSpecType() && !LangOpts.CPlusPlus1z)
4347 S.Diag(FTI.getExceptionSpecLocBeg(),
4348 diag::err_exception_spec_in_typedef)
4349 << (D.getContext() == Declarator::AliasDeclContext ||
4350 D.getContext() == Declarator::AliasTemplateContext);
4352 // If we see "T var();" or "T var(T());" at block scope, it is probably
4353 // an attempt to initialize a variable, not a function declaration.
4354 if (FTI.isAmbiguous)
4355 warnAboutAmbiguousFunction(S, D, DeclType, T);
4357 FunctionType::ExtInfo EI(getCCForDeclaratorChunk(S, D, FTI, chunkIndex));
4359 if (!FTI.NumParams && !FTI.isVariadic && !LangOpts.CPlusPlus) {
4360 // Simple void foo(), where the incoming T is the result type.
4361 T = Context.getFunctionNoProtoType(T, EI);
4363 // We allow a zero-parameter variadic function in C if the
4364 // function is marked with the "overloadable" attribute. Scan
4365 // for this attribute now.
4366 if (!FTI.NumParams && FTI.isVariadic && !LangOpts.CPlusPlus) {
4367 bool Overloadable = false;
4368 for (const AttributeList *Attrs = D.getAttributes();
4369 Attrs; Attrs = Attrs->getNext()) {
4370 if (Attrs->getKind() == AttributeList::AT_Overloadable) {
4371 Overloadable = true;
4377 S.Diag(FTI.getEllipsisLoc(), diag::err_ellipsis_first_param);
4380 if (FTI.NumParams && FTI.Params[0].Param == nullptr) {
4381 // C99 6.7.5.3p3: Reject int(x,y,z) when it's not a function
4383 S.Diag(FTI.Params[0].IdentLoc,
4384 diag::err_ident_list_in_fn_declaration);
4385 D.setInvalidType(true);
4386 // Recover by creating a K&R-style function type.
4387 T = Context.getFunctionNoProtoType(T, EI);
4391 FunctionProtoType::ExtProtoInfo EPI;
4393 EPI.Variadic = FTI.isVariadic;
4394 EPI.HasTrailingReturn = FTI.hasTrailingReturnType();
4395 EPI.TypeQuals = FTI.TypeQuals;
4396 EPI.RefQualifier = !FTI.hasRefQualifier()? RQ_None
4397 : FTI.RefQualifierIsLValueRef? RQ_LValue
4400 // Otherwise, we have a function with a parameter list that is
4401 // potentially variadic.
4402 SmallVector<QualType, 16> ParamTys;
4403 ParamTys.reserve(FTI.NumParams);
4405 SmallVector<FunctionProtoType::ExtParameterInfo, 16>
4406 ExtParameterInfos(FTI.NumParams);
4407 bool HasAnyInterestingExtParameterInfos = false;
4409 for (unsigned i = 0, e = FTI.NumParams; i != e; ++i) {
4410 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.Params[i].Param);
4411 QualType ParamTy = Param->getType();
4412 assert(!ParamTy.isNull() && "Couldn't parse type?");
4414 // Look for 'void'. void is allowed only as a single parameter to a
4415 // function with no other parameters (C99 6.7.5.3p10). We record
4416 // int(void) as a FunctionProtoType with an empty parameter list.
4417 if (ParamTy->isVoidType()) {
4418 // If this is something like 'float(int, void)', reject it. 'void'
4419 // is an incomplete type (C99 6.2.5p19) and function decls cannot
4420 // have parameters of incomplete type.
4421 if (FTI.NumParams != 1 || FTI.isVariadic) {
4422 S.Diag(DeclType.Loc, diag::err_void_only_param);
4423 ParamTy = Context.IntTy;
4424 Param->setType(ParamTy);
4425 } else if (FTI.Params[i].Ident) {
4426 // Reject, but continue to parse 'int(void abc)'.
4427 S.Diag(FTI.Params[i].IdentLoc, diag::err_param_with_void_type);
4428 ParamTy = Context.IntTy;
4429 Param->setType(ParamTy);
4431 // Reject, but continue to parse 'float(const void)'.
4432 if (ParamTy.hasQualifiers())
4433 S.Diag(DeclType.Loc, diag::err_void_param_qualified);
4435 // Do not add 'void' to the list.
4438 } else if (ParamTy->isHalfType()) {
4439 // Disallow half FP parameters.
4440 // FIXME: This really should be in BuildFunctionType.
4441 if (S.getLangOpts().OpenCL) {
4442 if (!S.getOpenCLOptions().isEnabled("cl_khr_fp16")) {
4443 S.Diag(Param->getLocation(),
4444 diag::err_opencl_half_param) << ParamTy;
4446 Param->setInvalidDecl();
4448 } else if (!S.getLangOpts().HalfArgsAndReturns) {
4449 S.Diag(Param->getLocation(),
4450 diag::err_parameters_retval_cannot_have_fp16_type) << 0;
4453 } else if (!FTI.hasPrototype) {
4454 if (ParamTy->isPromotableIntegerType()) {
4455 ParamTy = Context.getPromotedIntegerType(ParamTy);
4456 Param->setKNRPromoted(true);
4457 } else if (const BuiltinType* BTy = ParamTy->getAs<BuiltinType>()) {
4458 if (BTy->getKind() == BuiltinType::Float) {
4459 ParamTy = Context.DoubleTy;
4460 Param->setKNRPromoted(true);
4465 if (LangOpts.ObjCAutoRefCount && Param->hasAttr<NSConsumedAttr>()) {
4466 ExtParameterInfos[i] = ExtParameterInfos[i].withIsConsumed(true);
4467 HasAnyInterestingExtParameterInfos = true;
4470 if (auto attr = Param->getAttr<ParameterABIAttr>()) {
4471 ExtParameterInfos[i] =
4472 ExtParameterInfos[i].withABI(attr->getABI());
4473 HasAnyInterestingExtParameterInfos = true;
4476 if (Param->hasAttr<PassObjectSizeAttr>()) {
4477 ExtParameterInfos[i] = ExtParameterInfos[i].withHasPassObjectSize();
4478 HasAnyInterestingExtParameterInfos = true;
4481 ParamTys.push_back(ParamTy);
4484 if (HasAnyInterestingExtParameterInfos) {
4485 EPI.ExtParameterInfos = ExtParameterInfos.data();
4486 checkExtParameterInfos(S, ParamTys, EPI,
4487 [&](unsigned i) { return FTI.Params[i].Param->getLocation(); });
4490 SmallVector<QualType, 4> Exceptions;
4491 SmallVector<ParsedType, 2> DynamicExceptions;
4492 SmallVector<SourceRange, 2> DynamicExceptionRanges;
4493 Expr *NoexceptExpr = nullptr;
4495 if (FTI.getExceptionSpecType() == EST_Dynamic) {
4496 // FIXME: It's rather inefficient to have to split into two vectors
4498 unsigned N = FTI.getNumExceptions();
4499 DynamicExceptions.reserve(N);
4500 DynamicExceptionRanges.reserve(N);
4501 for (unsigned I = 0; I != N; ++I) {
4502 DynamicExceptions.push_back(FTI.Exceptions[I].Ty);
4503 DynamicExceptionRanges.push_back(FTI.Exceptions[I].Range);
4505 } else if (FTI.getExceptionSpecType() == EST_ComputedNoexcept) {
4506 NoexceptExpr = FTI.NoexceptExpr;
4509 S.checkExceptionSpecification(D.isFunctionDeclarationContext(),
4510 FTI.getExceptionSpecType(),
4512 DynamicExceptionRanges,
4517 T = Context.getFunctionType(T, ParamTys, EPI);
4521 case DeclaratorChunk::MemberPointer: {
4522 // The scope spec must refer to a class, or be dependent.
4523 CXXScopeSpec &SS = DeclType.Mem.Scope();
4526 // Handle pointer nullability.
4527 inferPointerNullability(SimplePointerKind::MemberPointer,
4528 DeclType.Loc, DeclType.getAttrListRef());
4530 if (SS.isInvalid()) {
4531 // Avoid emitting extra errors if we already errored on the scope.
4532 D.setInvalidType(true);
4533 } else if (S.isDependentScopeSpecifier(SS) ||
4534 dyn_cast_or_null<CXXRecordDecl>(S.computeDeclContext(SS))) {
4535 NestedNameSpecifier *NNS = SS.getScopeRep();
4536 NestedNameSpecifier *NNSPrefix = NNS->getPrefix();
4537 switch (NNS->getKind()) {
4538 case NestedNameSpecifier::Identifier:
4539 ClsType = Context.getDependentNameType(ETK_None, NNSPrefix,
4540 NNS->getAsIdentifier());
4543 case NestedNameSpecifier::Namespace:
4544 case NestedNameSpecifier::NamespaceAlias:
4545 case NestedNameSpecifier::Global:
4546 case NestedNameSpecifier::Super:
4547 llvm_unreachable("Nested-name-specifier must name a type");
4549 case NestedNameSpecifier::TypeSpec:
4550 case NestedNameSpecifier::TypeSpecWithTemplate:
4551 ClsType = QualType(NNS->getAsType(), 0);
4552 // Note: if the NNS has a prefix and ClsType is a nondependent
4553 // TemplateSpecializationType, then the NNS prefix is NOT included
4554 // in ClsType; hence we wrap ClsType into an ElaboratedType.
4555 // NOTE: in particular, no wrap occurs if ClsType already is an
4556 // Elaborated, DependentName, or DependentTemplateSpecialization.
4557 if (NNSPrefix && isa<TemplateSpecializationType>(NNS->getAsType()))
4558 ClsType = Context.getElaboratedType(ETK_None, NNSPrefix, ClsType);
4562 S.Diag(DeclType.Mem.Scope().getBeginLoc(),
4563 diag::err_illegal_decl_mempointer_in_nonclass)
4564 << (D.getIdentifier() ? D.getIdentifier()->getName() : "type name")
4565 << DeclType.Mem.Scope().getRange();
4566 D.setInvalidType(true);
4569 if (!ClsType.isNull())
4570 T = S.BuildMemberPointerType(T, ClsType, DeclType.Loc,
4574 D.setInvalidType(true);
4575 } else if (DeclType.Mem.TypeQuals) {
4576 T = S.BuildQualifiedType(T, DeclType.Loc, DeclType.Mem.TypeQuals);
4581 case DeclaratorChunk::Pipe: {
4582 T = S.BuildReadPipeType(T, DeclType.Loc);
4583 processTypeAttrs(state, T, TAL_DeclSpec,
4584 D.getDeclSpec().getAttributes().getList());
4590 D.setInvalidType(true);
4594 // See if there are any attributes on this declarator chunk.
4595 processTypeAttrs(state, T, TAL_DeclChunk,
4596 const_cast<AttributeList *>(DeclType.getAttrs()));
4599 // GNU warning -Wstrict-prototypes
4600 // Warn if a function declaration is without a prototype.
4601 // This warning is issued for all kinds of unprototyped function
4602 // declarations (i.e. function type typedef, function pointer etc.)
4604 // The empty list in a function declarator that is not part of a definition
4605 // of that function specifies that no information about the number or types
4606 // of the parameters is supplied.
4607 if (!LangOpts.CPlusPlus && D.getFunctionDefinitionKind() == FDK_Declaration) {
4608 bool IsBlock = false;
4609 for (const DeclaratorChunk &DeclType : D.type_objects()) {
4610 switch (DeclType.Kind) {
4611 case DeclaratorChunk::BlockPointer:
4614 case DeclaratorChunk::Function: {
4615 const DeclaratorChunk::FunctionTypeInfo &FTI = DeclType.Fun;
4616 if (FTI.NumParams == 0)
4617 S.Diag(DeclType.Loc, diag::warn_strict_prototypes)
4619 << FixItHint::CreateInsertion(FTI.getRParenLoc(), "void");
4629 assert(!T.isNull() && "T must not be null after this point");
4631 if (LangOpts.CPlusPlus && T->isFunctionType()) {
4632 const FunctionProtoType *FnTy = T->getAs<FunctionProtoType>();
4633 assert(FnTy && "Why oh why is there not a FunctionProtoType here?");
4636 // A cv-qualifier-seq shall only be part of the function type
4637 // for a nonstatic member function, the function type to which a pointer
4638 // to member refers, or the top-level function type of a function typedef
4641 // Core issue 547 also allows cv-qualifiers on function types that are
4642 // top-level template type arguments.
4643 enum { NonMember, Member, DeductionGuide } Kind = NonMember;
4644 if (D.getName().getKind() == UnqualifiedId::IK_DeductionGuideName)
4645 Kind = DeductionGuide;
4646 else if (!D.getCXXScopeSpec().isSet()) {
4647 if ((D.getContext() == Declarator::MemberContext ||
4648 D.getContext() == Declarator::LambdaExprContext) &&
4649 !D.getDeclSpec().isFriendSpecified())
4652 DeclContext *DC = S.computeDeclContext(D.getCXXScopeSpec());
4653 if (!DC || DC->isRecord())
4657 // C++11 [dcl.fct]p6 (w/DR1417):
4658 // An attempt to specify a function type with a cv-qualifier-seq or a
4659 // ref-qualifier (including by typedef-name) is ill-formed unless it is:
4660 // - the function type for a non-static member function,
4661 // - the function type to which a pointer to member refers,
4662 // - the top-level function type of a function typedef declaration or
4663 // alias-declaration,
4664 // - the type-id in the default argument of a type-parameter, or
4665 // - the type-id of a template-argument for a type-parameter
4667 // FIXME: Checking this here is insufficient. We accept-invalid on:
4669 // template<typename T> struct S { void f(T); };
4670 // S<int() const> s;
4672 // ... for instance.
4673 if (IsQualifiedFunction &&
4675 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) &&
4677 D.getContext() != Declarator::TemplateTypeArgContext) {
4678 SourceLocation Loc = D.getLocStart();
4679 SourceRange RemovalRange;
4681 if (D.isFunctionDeclarator(I)) {
4682 SmallVector<SourceLocation, 4> RemovalLocs;
4683 const DeclaratorChunk &Chunk = D.getTypeObject(I);
4684 assert(Chunk.Kind == DeclaratorChunk::Function);
4685 if (Chunk.Fun.hasRefQualifier())
4686 RemovalLocs.push_back(Chunk.Fun.getRefQualifierLoc());
4687 if (Chunk.Fun.TypeQuals & Qualifiers::Const)
4688 RemovalLocs.push_back(Chunk.Fun.getConstQualifierLoc());
4689 if (Chunk.Fun.TypeQuals & Qualifiers::Volatile)
4690 RemovalLocs.push_back(Chunk.Fun.getVolatileQualifierLoc());
4691 if (Chunk.Fun.TypeQuals & Qualifiers::Restrict)
4692 RemovalLocs.push_back(Chunk.Fun.getRestrictQualifierLoc());
4693 if (!RemovalLocs.empty()) {
4694 std::sort(RemovalLocs.begin(), RemovalLocs.end(),
4695 BeforeThanCompare<SourceLocation>(S.getSourceManager()));
4696 RemovalRange = SourceRange(RemovalLocs.front(), RemovalLocs.back());
4697 Loc = RemovalLocs.front();
4701 S.Diag(Loc, diag::err_invalid_qualified_function_type)
4702 << Kind << D.isFunctionDeclarator() << T
4703 << getFunctionQualifiersAsString(FnTy)
4704 << FixItHint::CreateRemoval(RemovalRange);
4706 // Strip the cv-qualifiers and ref-qualifiers from the type.
4707 FunctionProtoType::ExtProtoInfo EPI = FnTy->getExtProtoInfo();
4709 EPI.RefQualifier = RQ_None;
4711 T = Context.getFunctionType(FnTy->getReturnType(), FnTy->getParamTypes(),
4713 // Rebuild any parens around the identifier in the function type.
4714 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) {
4715 if (D.getTypeObject(i).Kind != DeclaratorChunk::Paren)
4717 T = S.BuildParenType(T);
4722 // Apply any undistributed attributes from the declarator.
4723 processTypeAttrs(state, T, TAL_DeclName, D.getAttributes());
4725 // Diagnose any ignored type attributes.
4726 state.diagnoseIgnoredTypeAttrs(T);
4728 // C++0x [dcl.constexpr]p9:
4729 // A constexpr specifier used in an object declaration declares the object
4731 if (D.getDeclSpec().isConstexprSpecified() && T->isObjectType()) {
4735 // If there was an ellipsis in the declarator, the declaration declares a
4736 // parameter pack whose type may be a pack expansion type.
4737 if (D.hasEllipsis()) {
4738 // C++0x [dcl.fct]p13:
4739 // A declarator-id or abstract-declarator containing an ellipsis shall
4740 // only be used in a parameter-declaration. Such a parameter-declaration
4741 // is a parameter pack (14.5.3). [...]
4742 switch (D.getContext()) {
4743 case Declarator::PrototypeContext:
4744 case Declarator::LambdaExprParameterContext:
4745 // C++0x [dcl.fct]p13:
4746 // [...] When it is part of a parameter-declaration-clause, the
4747 // parameter pack is a function parameter pack (14.5.3). The type T
4748 // of the declarator-id of the function parameter pack shall contain
4749 // a template parameter pack; each template parameter pack in T is
4750 // expanded by the function parameter pack.
4752 // We represent function parameter packs as function parameters whose
4753 // type is a pack expansion.
4754 if (!T->containsUnexpandedParameterPack()) {
4755 S.Diag(D.getEllipsisLoc(),
4756 diag::err_function_parameter_pack_without_parameter_packs)
4757 << T << D.getSourceRange();
4758 D.setEllipsisLoc(SourceLocation());
4760 T = Context.getPackExpansionType(T, None);
4763 case Declarator::TemplateParamContext:
4764 // C++0x [temp.param]p15:
4765 // If a template-parameter is a [...] is a parameter-declaration that
4766 // declares a parameter pack (8.3.5), then the template-parameter is a
4767 // template parameter pack (14.5.3).
4769 // Note: core issue 778 clarifies that, if there are any unexpanded
4770 // parameter packs in the type of the non-type template parameter, then
4771 // it expands those parameter packs.
4772 if (T->containsUnexpandedParameterPack())
4773 T = Context.getPackExpansionType(T, None);
4775 S.Diag(D.getEllipsisLoc(),
4776 LangOpts.CPlusPlus11
4777 ? diag::warn_cxx98_compat_variadic_templates
4778 : diag::ext_variadic_templates);
4781 case Declarator::FileContext:
4782 case Declarator::KNRTypeListContext:
4783 case Declarator::ObjCParameterContext: // FIXME: special diagnostic here?
4784 case Declarator::ObjCResultContext: // FIXME: special diagnostic here?
4785 case Declarator::TypeNameContext:
4786 case Declarator::FunctionalCastContext:
4787 case Declarator::CXXNewContext:
4788 case Declarator::AliasDeclContext:
4789 case Declarator::AliasTemplateContext:
4790 case Declarator::MemberContext:
4791 case Declarator::BlockContext:
4792 case Declarator::ForContext:
4793 case Declarator::InitStmtContext:
4794 case Declarator::ConditionContext:
4795 case Declarator::CXXCatchContext:
4796 case Declarator::ObjCCatchContext:
4797 case Declarator::BlockLiteralContext:
4798 case Declarator::LambdaExprContext:
4799 case Declarator::ConversionIdContext:
4800 case Declarator::TrailingReturnContext:
4801 case Declarator::TemplateTypeArgContext:
4802 // FIXME: We may want to allow parameter packs in block-literal contexts
4804 S.Diag(D.getEllipsisLoc(),
4805 diag::err_ellipsis_in_declarator_not_parameter);
4806 D.setEllipsisLoc(SourceLocation());
4811 assert(!T.isNull() && "T must not be null at the end of this function");
4812 if (D.isInvalidType())
4813 return Context.getTrivialTypeSourceInfo(T);
4815 return S.GetTypeSourceInfoForDeclarator(D, T, TInfo);
4818 /// GetTypeForDeclarator - Convert the type for the specified
4819 /// declarator to Type instances.
4821 /// The result of this call will never be null, but the associated
4822 /// type may be a null type if there's an unrecoverable error.
4823 TypeSourceInfo *Sema::GetTypeForDeclarator(Declarator &D, Scope *S) {
4824 // Determine the type of the declarator. Not all forms of declarator
4827 TypeProcessingState state(*this, D);
4829 TypeSourceInfo *ReturnTypeInfo = nullptr;
4830 QualType T = GetDeclSpecTypeForDeclarator(state, ReturnTypeInfo);
4832 if (D.isPrototypeContext() && getLangOpts().ObjCAutoRefCount)
4833 inferARCWriteback(state, T);
4835 return GetFullTypeForDeclarator(state, T, ReturnTypeInfo);
4838 static void transferARCOwnershipToDeclSpec(Sema &S,
4839 QualType &declSpecTy,
4840 Qualifiers::ObjCLifetime ownership) {
4841 if (declSpecTy->isObjCRetainableType() &&
4842 declSpecTy.getObjCLifetime() == Qualifiers::OCL_None) {
4844 qs.addObjCLifetime(ownership);
4845 declSpecTy = S.Context.getQualifiedType(declSpecTy, qs);
4849 static void transferARCOwnershipToDeclaratorChunk(TypeProcessingState &state,
4850 Qualifiers::ObjCLifetime ownership,
4851 unsigned chunkIndex) {
4852 Sema &S = state.getSema();
4853 Declarator &D = state.getDeclarator();
4855 // Look for an explicit lifetime attribute.
4856 DeclaratorChunk &chunk = D.getTypeObject(chunkIndex);
4857 for (const AttributeList *attr = chunk.getAttrs(); attr;
4858 attr = attr->getNext())
4859 if (attr->getKind() == AttributeList::AT_ObjCOwnership)
4862 const char *attrStr = nullptr;
4863 switch (ownership) {
4864 case Qualifiers::OCL_None: llvm_unreachable("no ownership!");
4865 case Qualifiers::OCL_ExplicitNone: attrStr = "none"; break;
4866 case Qualifiers::OCL_Strong: attrStr = "strong"; break;
4867 case Qualifiers::OCL_Weak: attrStr = "weak"; break;
4868 case Qualifiers::OCL_Autoreleasing: attrStr = "autoreleasing"; break;
4871 IdentifierLoc *Arg = new (S.Context) IdentifierLoc;
4872 Arg->Ident = &S.Context.Idents.get(attrStr);
4873 Arg->Loc = SourceLocation();
4875 ArgsUnion Args(Arg);
4877 // If there wasn't one, add one (with an invalid source location
4878 // so that we don't make an AttributedType for it).
4879 AttributeList *attr = D.getAttributePool()
4880 .create(&S.Context.Idents.get("objc_ownership"), SourceLocation(),
4881 /*scope*/ nullptr, SourceLocation(),
4882 /*args*/ &Args, 1, AttributeList::AS_GNU);
4883 spliceAttrIntoList(*attr, chunk.getAttrListRef());
4885 // TODO: mark whether we did this inference?
4888 /// \brief Used for transferring ownership in casts resulting in l-values.
4889 static void transferARCOwnership(TypeProcessingState &state,
4890 QualType &declSpecTy,
4891 Qualifiers::ObjCLifetime ownership) {
4892 Sema &S = state.getSema();
4893 Declarator &D = state.getDeclarator();
4896 bool hasIndirection = false;
4897 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) {
4898 DeclaratorChunk &chunk = D.getTypeObject(i);
4899 switch (chunk.Kind) {
4900 case DeclaratorChunk::Paren:
4904 case DeclaratorChunk::Array:
4905 case DeclaratorChunk::Reference:
4906 case DeclaratorChunk::Pointer:
4908 hasIndirection = true;
4912 case DeclaratorChunk::BlockPointer:
4914 transferARCOwnershipToDeclaratorChunk(state, ownership, i);
4917 case DeclaratorChunk::Function:
4918 case DeclaratorChunk::MemberPointer:
4919 case DeclaratorChunk::Pipe:
4927 DeclaratorChunk &chunk = D.getTypeObject(inner);
4928 if (chunk.Kind == DeclaratorChunk::Pointer) {
4929 if (declSpecTy->isObjCRetainableType())
4930 return transferARCOwnershipToDeclSpec(S, declSpecTy, ownership);
4931 if (declSpecTy->isObjCObjectType() && hasIndirection)
4932 return transferARCOwnershipToDeclaratorChunk(state, ownership, inner);
4934 assert(chunk.Kind == DeclaratorChunk::Array ||
4935 chunk.Kind == DeclaratorChunk::Reference);
4936 return transferARCOwnershipToDeclSpec(S, declSpecTy, ownership);
4940 TypeSourceInfo *Sema::GetTypeForDeclaratorCast(Declarator &D, QualType FromTy) {
4941 TypeProcessingState state(*this, D);
4943 TypeSourceInfo *ReturnTypeInfo = nullptr;
4944 QualType declSpecTy = GetDeclSpecTypeForDeclarator(state, ReturnTypeInfo);
4946 if (getLangOpts().ObjC1) {
4947 Qualifiers::ObjCLifetime ownership = Context.getInnerObjCOwnership(FromTy);
4948 if (ownership != Qualifiers::OCL_None)
4949 transferARCOwnership(state, declSpecTy, ownership);
4952 return GetFullTypeForDeclarator(state, declSpecTy, ReturnTypeInfo);
4955 /// Map an AttributedType::Kind to an AttributeList::Kind.
4956 static AttributeList::Kind getAttrListKind(AttributedType::Kind kind) {
4958 case AttributedType::attr_address_space:
4959 return AttributeList::AT_AddressSpace;
4960 case AttributedType::attr_regparm:
4961 return AttributeList::AT_Regparm;
4962 case AttributedType::attr_vector_size:
4963 return AttributeList::AT_VectorSize;
4964 case AttributedType::attr_neon_vector_type:
4965 return AttributeList::AT_NeonVectorType;
4966 case AttributedType::attr_neon_polyvector_type:
4967 return AttributeList::AT_NeonPolyVectorType;
4968 case AttributedType::attr_objc_gc:
4969 return AttributeList::AT_ObjCGC;
4970 case AttributedType::attr_objc_ownership:
4971 case AttributedType::attr_objc_inert_unsafe_unretained:
4972 return AttributeList::AT_ObjCOwnership;
4973 case AttributedType::attr_noreturn:
4974 return AttributeList::AT_NoReturn;
4975 case AttributedType::attr_cdecl:
4976 return AttributeList::AT_CDecl;
4977 case AttributedType::attr_fastcall:
4978 return AttributeList::AT_FastCall;
4979 case AttributedType::attr_stdcall:
4980 return AttributeList::AT_StdCall;
4981 case AttributedType::attr_thiscall:
4982 return AttributeList::AT_ThisCall;
4983 case AttributedType::attr_regcall:
4984 return AttributeList::AT_RegCall;
4985 case AttributedType::attr_pascal:
4986 return AttributeList::AT_Pascal;
4987 case AttributedType::attr_swiftcall:
4988 return AttributeList::AT_SwiftCall;
4989 case AttributedType::attr_vectorcall:
4990 return AttributeList::AT_VectorCall;
4991 case AttributedType::attr_pcs:
4992 case AttributedType::attr_pcs_vfp:
4993 return AttributeList::AT_Pcs;
4994 case AttributedType::attr_inteloclbicc:
4995 return AttributeList::AT_IntelOclBicc;
4996 case AttributedType::attr_ms_abi:
4997 return AttributeList::AT_MSABI;
4998 case AttributedType::attr_sysv_abi:
4999 return AttributeList::AT_SysVABI;
5000 case AttributedType::attr_preserve_most:
5001 return AttributeList::AT_PreserveMost;
5002 case AttributedType::attr_preserve_all:
5003 return AttributeList::AT_PreserveAll;
5004 case AttributedType::attr_ptr32:
5005 return AttributeList::AT_Ptr32;
5006 case AttributedType::attr_ptr64:
5007 return AttributeList::AT_Ptr64;
5008 case AttributedType::attr_sptr:
5009 return AttributeList::AT_SPtr;
5010 case AttributedType::attr_uptr:
5011 return AttributeList::AT_UPtr;
5012 case AttributedType::attr_nonnull:
5013 return AttributeList::AT_TypeNonNull;
5014 case AttributedType::attr_nullable:
5015 return AttributeList::AT_TypeNullable;
5016 case AttributedType::attr_null_unspecified:
5017 return AttributeList::AT_TypeNullUnspecified;
5018 case AttributedType::attr_objc_kindof:
5019 return AttributeList::AT_ObjCKindOf;
5020 case AttributedType::attr_ns_returns_retained:
5021 return AttributeList::AT_NSReturnsRetained;
5023 llvm_unreachable("unexpected attribute kind!");
5026 static void fillAttributedTypeLoc(AttributedTypeLoc TL,
5027 const AttributeList *attrs,
5028 const AttributeList *DeclAttrs = nullptr) {
5029 // DeclAttrs and attrs cannot be both empty.
5030 assert((attrs || DeclAttrs) &&
5031 "no type attributes in the expected location!");
5033 AttributeList::Kind parsedKind = getAttrListKind(TL.getAttrKind());
5034 // Try to search for an attribute of matching kind in attrs list.
5035 while (attrs && attrs->getKind() != parsedKind)
5036 attrs = attrs->getNext();
5038 // No matching type attribute in attrs list found.
5039 // Try searching through C++11 attributes in the declarator attribute list.
5040 while (DeclAttrs && (!DeclAttrs->isCXX11Attribute() ||
5041 DeclAttrs->getKind() != parsedKind))
5042 DeclAttrs = DeclAttrs->getNext();
5046 assert(attrs && "no matching type attribute in expected location!");
5048 TL.setAttrNameLoc(attrs->getLoc());
5049 if (TL.hasAttrExprOperand()) {
5050 assert(attrs->isArgExpr(0) && "mismatched attribute operand kind");
5051 TL.setAttrExprOperand(attrs->getArgAsExpr(0));
5052 } else if (TL.hasAttrEnumOperand()) {
5053 assert((attrs->isArgIdent(0) || attrs->isArgExpr(0)) &&
5054 "unexpected attribute operand kind");
5055 if (attrs->isArgIdent(0))
5056 TL.setAttrEnumOperandLoc(attrs->getArgAsIdent(0)->Loc);
5058 TL.setAttrEnumOperandLoc(attrs->getArgAsExpr(0)->getExprLoc());
5061 // FIXME: preserve this information to here.
5062 if (TL.hasAttrOperand())
5063 TL.setAttrOperandParensRange(SourceRange());
5067 class TypeSpecLocFiller : public TypeLocVisitor<TypeSpecLocFiller> {
5068 ASTContext &Context;
5072 TypeSpecLocFiller(ASTContext &Context, const DeclSpec &DS)
5073 : Context(Context), DS(DS) {}
5075 void VisitAttributedTypeLoc(AttributedTypeLoc TL) {
5076 fillAttributedTypeLoc(TL, DS.getAttributes().getList());
5077 Visit(TL.getModifiedLoc());
5079 void VisitQualifiedTypeLoc(QualifiedTypeLoc TL) {
5080 Visit(TL.getUnqualifiedLoc());
5082 void VisitTypedefTypeLoc(TypedefTypeLoc TL) {
5083 TL.setNameLoc(DS.getTypeSpecTypeLoc());
5085 void VisitObjCInterfaceTypeLoc(ObjCInterfaceTypeLoc TL) {
5086 TL.setNameLoc(DS.getTypeSpecTypeLoc());
5087 // FIXME. We should have DS.getTypeSpecTypeEndLoc(). But, it requires
5088 // addition field. What we have is good enough for dispay of location
5089 // of 'fixit' on interface name.
5090 TL.setNameEndLoc(DS.getLocEnd());
5092 void VisitObjCObjectTypeLoc(ObjCObjectTypeLoc TL) {
5093 TypeSourceInfo *RepTInfo = nullptr;
5094 Sema::GetTypeFromParser(DS.getRepAsType(), &RepTInfo);
5095 TL.copy(RepTInfo->getTypeLoc());
5097 void VisitObjCObjectPointerTypeLoc(ObjCObjectPointerTypeLoc TL) {
5098 TypeSourceInfo *RepTInfo = nullptr;
5099 Sema::GetTypeFromParser(DS.getRepAsType(), &RepTInfo);
5100 TL.copy(RepTInfo->getTypeLoc());
5102 void VisitTemplateSpecializationTypeLoc(TemplateSpecializationTypeLoc TL) {
5103 TypeSourceInfo *TInfo = nullptr;
5104 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo);
5106 // If we got no declarator info from previous Sema routines,
5107 // just fill with the typespec loc.
5109 TL.initialize(Context, DS.getTypeSpecTypeNameLoc());
5113 TypeLoc OldTL = TInfo->getTypeLoc();
5114 if (TInfo->getType()->getAs<ElaboratedType>()) {
5115 ElaboratedTypeLoc ElabTL = OldTL.castAs<ElaboratedTypeLoc>();
5116 TemplateSpecializationTypeLoc NamedTL = ElabTL.getNamedTypeLoc()
5117 .castAs<TemplateSpecializationTypeLoc>();
5120 TL.copy(OldTL.castAs<TemplateSpecializationTypeLoc>());
5121 assert(TL.getRAngleLoc() == OldTL.castAs<TemplateSpecializationTypeLoc>().getRAngleLoc());
5125 void VisitTypeOfExprTypeLoc(TypeOfExprTypeLoc TL) {
5126 assert(DS.getTypeSpecType() == DeclSpec::TST_typeofExpr);
5127 TL.setTypeofLoc(DS.getTypeSpecTypeLoc());
5128 TL.setParensRange(DS.getTypeofParensRange());
5130 void VisitTypeOfTypeLoc(TypeOfTypeLoc TL) {
5131 assert(DS.getTypeSpecType() == DeclSpec::TST_typeofType);
5132 TL.setTypeofLoc(DS.getTypeSpecTypeLoc());
5133 TL.setParensRange(DS.getTypeofParensRange());
5134 assert(DS.getRepAsType());
5135 TypeSourceInfo *TInfo = nullptr;
5136 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo);
5137 TL.setUnderlyingTInfo(TInfo);
5139 void VisitUnaryTransformTypeLoc(UnaryTransformTypeLoc TL) {
5140 // FIXME: This holds only because we only have one unary transform.
5141 assert(DS.getTypeSpecType() == DeclSpec::TST_underlyingType);
5142 TL.setKWLoc(DS.getTypeSpecTypeLoc());
5143 TL.setParensRange(DS.getTypeofParensRange());
5144 assert(DS.getRepAsType());
5145 TypeSourceInfo *TInfo = nullptr;
5146 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo);
5147 TL.setUnderlyingTInfo(TInfo);
5149 void VisitBuiltinTypeLoc(BuiltinTypeLoc TL) {
5150 // By default, use the source location of the type specifier.
5151 TL.setBuiltinLoc(DS.getTypeSpecTypeLoc());
5152 if (TL.needsExtraLocalData()) {
5153 // Set info for the written builtin specifiers.
5154 TL.getWrittenBuiltinSpecs() = DS.getWrittenBuiltinSpecs();
5155 // Try to have a meaningful source location.
5156 if (TL.getWrittenSignSpec() != TSS_unspecified)
5157 TL.expandBuiltinRange(DS.getTypeSpecSignLoc());
5158 if (TL.getWrittenWidthSpec() != TSW_unspecified)
5159 TL.expandBuiltinRange(DS.getTypeSpecWidthRange());
5162 void VisitElaboratedTypeLoc(ElaboratedTypeLoc TL) {
5163 ElaboratedTypeKeyword Keyword
5164 = TypeWithKeyword::getKeywordForTypeSpec(DS.getTypeSpecType());
5165 if (DS.getTypeSpecType() == TST_typename) {
5166 TypeSourceInfo *TInfo = nullptr;
5167 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo);
5169 TL.copy(TInfo->getTypeLoc().castAs<ElaboratedTypeLoc>());
5173 TL.setElaboratedKeywordLoc(Keyword != ETK_None
5174 ? DS.getTypeSpecTypeLoc()
5175 : SourceLocation());
5176 const CXXScopeSpec& SS = DS.getTypeSpecScope();
5177 TL.setQualifierLoc(SS.getWithLocInContext(Context));
5178 Visit(TL.getNextTypeLoc().getUnqualifiedLoc());
5180 void VisitDependentNameTypeLoc(DependentNameTypeLoc TL) {
5181 assert(DS.getTypeSpecType() == TST_typename);
5182 TypeSourceInfo *TInfo = nullptr;
5183 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo);
5185 TL.copy(TInfo->getTypeLoc().castAs<DependentNameTypeLoc>());
5187 void VisitDependentTemplateSpecializationTypeLoc(
5188 DependentTemplateSpecializationTypeLoc TL) {
5189 assert(DS.getTypeSpecType() == TST_typename);
5190 TypeSourceInfo *TInfo = nullptr;
5191 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo);
5194 TInfo->getTypeLoc().castAs<DependentTemplateSpecializationTypeLoc>());
5196 void VisitTagTypeLoc(TagTypeLoc TL) {
5197 TL.setNameLoc(DS.getTypeSpecTypeNameLoc());
5199 void VisitAtomicTypeLoc(AtomicTypeLoc TL) {
5200 // An AtomicTypeLoc can come from either an _Atomic(...) type specifier
5201 // or an _Atomic qualifier.
5202 if (DS.getTypeSpecType() == DeclSpec::TST_atomic) {
5203 TL.setKWLoc(DS.getTypeSpecTypeLoc());
5204 TL.setParensRange(DS.getTypeofParensRange());
5206 TypeSourceInfo *TInfo = nullptr;
5207 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo);
5209 TL.getValueLoc().initializeFullCopy(TInfo->getTypeLoc());
5211 TL.setKWLoc(DS.getAtomicSpecLoc());
5212 // No parens, to indicate this was spelled as an _Atomic qualifier.
5213 TL.setParensRange(SourceRange());
5214 Visit(TL.getValueLoc());
5218 void VisitPipeTypeLoc(PipeTypeLoc TL) {
5219 TL.setKWLoc(DS.getTypeSpecTypeLoc());
5221 TypeSourceInfo *TInfo = nullptr;
5222 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo);
5223 TL.getValueLoc().initializeFullCopy(TInfo->getTypeLoc());
5226 void VisitTypeLoc(TypeLoc TL) {
5227 // FIXME: add other typespec types and change this to an assert.
5228 TL.initialize(Context, DS.getTypeSpecTypeLoc());
5232 class DeclaratorLocFiller : public TypeLocVisitor<DeclaratorLocFiller> {
5233 ASTContext &Context;
5234 const DeclaratorChunk &Chunk;
5237 DeclaratorLocFiller(ASTContext &Context, const DeclaratorChunk &Chunk)
5238 : Context(Context), Chunk(Chunk) {}
5240 void VisitQualifiedTypeLoc(QualifiedTypeLoc TL) {
5241 llvm_unreachable("qualified type locs not expected here!");
5243 void VisitDecayedTypeLoc(DecayedTypeLoc TL) {
5244 llvm_unreachable("decayed type locs not expected here!");
5247 void VisitAttributedTypeLoc(AttributedTypeLoc TL) {
5248 fillAttributedTypeLoc(TL, Chunk.getAttrs());
5250 void VisitAdjustedTypeLoc(AdjustedTypeLoc TL) {
5253 void VisitBlockPointerTypeLoc(BlockPointerTypeLoc TL) {
5254 assert(Chunk.Kind == DeclaratorChunk::BlockPointer);
5255 TL.setCaretLoc(Chunk.Loc);
5257 void VisitPointerTypeLoc(PointerTypeLoc TL) {
5258 assert(Chunk.Kind == DeclaratorChunk::Pointer);
5259 TL.setStarLoc(Chunk.Loc);
5261 void VisitObjCObjectPointerTypeLoc(ObjCObjectPointerTypeLoc TL) {
5262 assert(Chunk.Kind == DeclaratorChunk::Pointer);
5263 TL.setStarLoc(Chunk.Loc);
5265 void VisitMemberPointerTypeLoc(MemberPointerTypeLoc TL) {
5266 assert(Chunk.Kind == DeclaratorChunk::MemberPointer);
5267 const CXXScopeSpec& SS = Chunk.Mem.Scope();
5268 NestedNameSpecifierLoc NNSLoc = SS.getWithLocInContext(Context);
5270 const Type* ClsTy = TL.getClass();
5271 QualType ClsQT = QualType(ClsTy, 0);
5272 TypeSourceInfo *ClsTInfo = Context.CreateTypeSourceInfo(ClsQT, 0);
5273 // Now copy source location info into the type loc component.
5274 TypeLoc ClsTL = ClsTInfo->getTypeLoc();
5275 switch (NNSLoc.getNestedNameSpecifier()->getKind()) {
5276 case NestedNameSpecifier::Identifier:
5277 assert(isa<DependentNameType>(ClsTy) && "Unexpected TypeLoc");
5279 DependentNameTypeLoc DNTLoc = ClsTL.castAs<DependentNameTypeLoc>();
5280 DNTLoc.setElaboratedKeywordLoc(SourceLocation());
5281 DNTLoc.setQualifierLoc(NNSLoc.getPrefix());
5282 DNTLoc.setNameLoc(NNSLoc.getLocalBeginLoc());
5286 case NestedNameSpecifier::TypeSpec:
5287 case NestedNameSpecifier::TypeSpecWithTemplate:
5288 if (isa<ElaboratedType>(ClsTy)) {
5289 ElaboratedTypeLoc ETLoc = ClsTL.castAs<ElaboratedTypeLoc>();
5290 ETLoc.setElaboratedKeywordLoc(SourceLocation());
5291 ETLoc.setQualifierLoc(NNSLoc.getPrefix());
5292 TypeLoc NamedTL = ETLoc.getNamedTypeLoc();
5293 NamedTL.initializeFullCopy(NNSLoc.getTypeLoc());
5295 ClsTL.initializeFullCopy(NNSLoc.getTypeLoc());
5299 case NestedNameSpecifier::Namespace:
5300 case NestedNameSpecifier::NamespaceAlias:
5301 case NestedNameSpecifier::Global:
5302 case NestedNameSpecifier::Super:
5303 llvm_unreachable("Nested-name-specifier must name a type");
5306 // Finally fill in MemberPointerLocInfo fields.
5307 TL.setStarLoc(Chunk.Loc);
5308 TL.setClassTInfo(ClsTInfo);
5310 void VisitLValueReferenceTypeLoc(LValueReferenceTypeLoc TL) {
5311 assert(Chunk.Kind == DeclaratorChunk::Reference);
5312 // 'Amp' is misleading: this might have been originally
5313 /// spelled with AmpAmp.
5314 TL.setAmpLoc(Chunk.Loc);
5316 void VisitRValueReferenceTypeLoc(RValueReferenceTypeLoc TL) {
5317 assert(Chunk.Kind == DeclaratorChunk::Reference);
5318 assert(!Chunk.Ref.LValueRef);
5319 TL.setAmpAmpLoc(Chunk.Loc);
5321 void VisitArrayTypeLoc(ArrayTypeLoc TL) {
5322 assert(Chunk.Kind == DeclaratorChunk::Array);
5323 TL.setLBracketLoc(Chunk.Loc);
5324 TL.setRBracketLoc(Chunk.EndLoc);
5325 TL.setSizeExpr(static_cast<Expr*>(Chunk.Arr.NumElts));
5327 void VisitFunctionTypeLoc(FunctionTypeLoc TL) {
5328 assert(Chunk.Kind == DeclaratorChunk::Function);
5329 TL.setLocalRangeBegin(Chunk.Loc);
5330 TL.setLocalRangeEnd(Chunk.EndLoc);
5332 const DeclaratorChunk::FunctionTypeInfo &FTI = Chunk.Fun;
5333 TL.setLParenLoc(FTI.getLParenLoc());
5334 TL.setRParenLoc(FTI.getRParenLoc());
5335 for (unsigned i = 0, e = TL.getNumParams(), tpi = 0; i != e; ++i) {
5336 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.Params[i].Param);
5337 TL.setParam(tpi++, Param);
5339 TL.setExceptionSpecRange(FTI.getExceptionSpecRange());
5341 void VisitParenTypeLoc(ParenTypeLoc TL) {
5342 assert(Chunk.Kind == DeclaratorChunk::Paren);
5343 TL.setLParenLoc(Chunk.Loc);
5344 TL.setRParenLoc(Chunk.EndLoc);
5346 void VisitPipeTypeLoc(PipeTypeLoc TL) {
5347 assert(Chunk.Kind == DeclaratorChunk::Pipe);
5348 TL.setKWLoc(Chunk.Loc);
5351 void VisitTypeLoc(TypeLoc TL) {
5352 llvm_unreachable("unsupported TypeLoc kind in declarator!");
5355 } // end anonymous namespace
5357 static void fillAtomicQualLoc(AtomicTypeLoc ATL, const DeclaratorChunk &Chunk) {
5359 switch (Chunk.Kind) {
5360 case DeclaratorChunk::Function:
5361 case DeclaratorChunk::Array:
5362 case DeclaratorChunk::Paren:
5363 case DeclaratorChunk::Pipe:
5364 llvm_unreachable("cannot be _Atomic qualified");
5366 case DeclaratorChunk::Pointer:
5367 Loc = SourceLocation::getFromRawEncoding(Chunk.Ptr.AtomicQualLoc);
5370 case DeclaratorChunk::BlockPointer:
5371 case DeclaratorChunk::Reference:
5372 case DeclaratorChunk::MemberPointer:
5373 // FIXME: Provide a source location for the _Atomic keyword.
5378 ATL.setParensRange(SourceRange());
5381 /// \brief Create and instantiate a TypeSourceInfo with type source information.
5383 /// \param T QualType referring to the type as written in source code.
5385 /// \param ReturnTypeInfo For declarators whose return type does not show
5386 /// up in the normal place in the declaration specifiers (such as a C++
5387 /// conversion function), this pointer will refer to a type source information
5388 /// for that return type.
5390 Sema::GetTypeSourceInfoForDeclarator(Declarator &D, QualType T,
5391 TypeSourceInfo *ReturnTypeInfo) {
5392 TypeSourceInfo *TInfo = Context.CreateTypeSourceInfo(T);
5393 UnqualTypeLoc CurrTL = TInfo->getTypeLoc().getUnqualifiedLoc();
5394 const AttributeList *DeclAttrs = D.getAttributes();
5396 // Handle parameter packs whose type is a pack expansion.
5397 if (isa<PackExpansionType>(T)) {
5398 CurrTL.castAs<PackExpansionTypeLoc>().setEllipsisLoc(D.getEllipsisLoc());
5399 CurrTL = CurrTL.getNextTypeLoc().getUnqualifiedLoc();
5402 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) {
5403 // An AtomicTypeLoc might be produced by an atomic qualifier in this
5404 // declarator chunk.
5405 if (AtomicTypeLoc ATL = CurrTL.getAs<AtomicTypeLoc>()) {
5406 fillAtomicQualLoc(ATL, D.getTypeObject(i));
5407 CurrTL = ATL.getValueLoc().getUnqualifiedLoc();
5410 while (AttributedTypeLoc TL = CurrTL.getAs<AttributedTypeLoc>()) {
5411 fillAttributedTypeLoc(TL, D.getTypeObject(i).getAttrs(), DeclAttrs);
5412 CurrTL = TL.getNextTypeLoc().getUnqualifiedLoc();
5415 // FIXME: Ordering here?
5416 while (AdjustedTypeLoc TL = CurrTL.getAs<AdjustedTypeLoc>())
5417 CurrTL = TL.getNextTypeLoc().getUnqualifiedLoc();
5419 DeclaratorLocFiller(Context, D.getTypeObject(i)).Visit(CurrTL);
5420 CurrTL = CurrTL.getNextTypeLoc().getUnqualifiedLoc();
5423 // If we have different source information for the return type, use
5424 // that. This really only applies to C++ conversion functions.
5425 if (ReturnTypeInfo) {
5426 TypeLoc TL = ReturnTypeInfo->getTypeLoc();
5427 assert(TL.getFullDataSize() == CurrTL.getFullDataSize());
5428 memcpy(CurrTL.getOpaqueData(), TL.getOpaqueData(), TL.getFullDataSize());
5430 TypeSpecLocFiller(Context, D.getDeclSpec()).Visit(CurrTL);
5436 /// \brief Create a LocInfoType to hold the given QualType and TypeSourceInfo.
5437 ParsedType Sema::CreateParsedType(QualType T, TypeSourceInfo *TInfo) {
5438 // FIXME: LocInfoTypes are "transient", only needed for passing to/from Parser
5439 // and Sema during declaration parsing. Try deallocating/caching them when
5440 // it's appropriate, instead of allocating them and keeping them around.
5441 LocInfoType *LocT = (LocInfoType*)BumpAlloc.Allocate(sizeof(LocInfoType),
5443 new (LocT) LocInfoType(T, TInfo);
5444 assert(LocT->getTypeClass() != T->getTypeClass() &&
5445 "LocInfoType's TypeClass conflicts with an existing Type class");
5446 return ParsedType::make(QualType(LocT, 0));
5449 void LocInfoType::getAsStringInternal(std::string &Str,
5450 const PrintingPolicy &Policy) const {
5451 llvm_unreachable("LocInfoType leaked into the type system; an opaque TypeTy*"
5452 " was used directly instead of getting the QualType through"
5453 " GetTypeFromParser");
5456 TypeResult Sema::ActOnTypeName(Scope *S, Declarator &D) {
5457 // C99 6.7.6: Type names have no identifier. This is already validated by
5459 assert(D.getIdentifier() == nullptr &&
5460 "Type name should have no identifier!");
5462 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S);
5463 QualType T = TInfo->getType();
5464 if (D.isInvalidType())
5467 // Make sure there are no unused decl attributes on the declarator.
5468 // We don't want to do this for ObjC parameters because we're going
5469 // to apply them to the actual parameter declaration.
5470 // Likewise, we don't want to do this for alias declarations, because
5471 // we are actually going to build a declaration from this eventually.
5472 if (D.getContext() != Declarator::ObjCParameterContext &&
5473 D.getContext() != Declarator::AliasDeclContext &&
5474 D.getContext() != Declarator::AliasTemplateContext)
5475 checkUnusedDeclAttributes(D);
5477 if (getLangOpts().CPlusPlus) {
5478 // Check that there are no default arguments (C++ only).
5479 CheckExtraCXXDefaultArguments(D);
5482 return CreateParsedType(T, TInfo);
5485 ParsedType Sema::ActOnObjCInstanceType(SourceLocation Loc) {
5486 QualType T = Context.getObjCInstanceType();
5487 TypeSourceInfo *TInfo = Context.getTrivialTypeSourceInfo(T, Loc);
5488 return CreateParsedType(T, TInfo);
5491 //===----------------------------------------------------------------------===//
5492 // Type Attribute Processing
5493 //===----------------------------------------------------------------------===//
5495 /// HandleAddressSpaceTypeAttribute - Process an address_space attribute on the
5496 /// specified type. The attribute contains 1 argument, the id of the address
5497 /// space for the type.
5498 static void HandleAddressSpaceTypeAttribute(QualType &Type,
5499 const AttributeList &Attr, Sema &S){
5501 // If this type is already address space qualified, reject it.
5502 // ISO/IEC TR 18037 S5.3 (amending C99 6.7.3): "No type shall be qualified by
5503 // qualifiers for two or more different address spaces."
5504 if (Type.getAddressSpace()) {
5505 S.Diag(Attr.getLoc(), diag::err_attribute_address_multiple_qualifiers);
5510 // ISO/IEC TR 18037 S5.3 (amending C99 6.7.3): "A function type shall not be
5511 // qualified by an address-space qualifier."
5512 if (Type->isFunctionType()) {
5513 S.Diag(Attr.getLoc(), diag::err_attribute_address_function_type);
5519 if (Attr.getKind() == AttributeList::AT_AddressSpace) {
5520 // Check the attribute arguments.
5521 if (Attr.getNumArgs() != 1) {
5522 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments)
5523 << Attr.getName() << 1;
5527 Expr *ASArgExpr = static_cast<Expr *>(Attr.getArgAsExpr(0));
5528 llvm::APSInt addrSpace(32);
5529 if (ASArgExpr->isTypeDependent() || ASArgExpr->isValueDependent() ||
5530 !ASArgExpr->isIntegerConstantExpr(addrSpace, S.Context)) {
5531 S.Diag(Attr.getLoc(), diag::err_attribute_argument_type)
5532 << Attr.getName() << AANT_ArgumentIntegerConstant
5533 << ASArgExpr->getSourceRange();
5539 if (addrSpace.isSigned()) {
5540 if (addrSpace.isNegative()) {
5541 S.Diag(Attr.getLoc(), diag::err_attribute_address_space_negative)
5542 << ASArgExpr->getSourceRange();
5546 addrSpace.setIsSigned(false);
5548 llvm::APSInt max(addrSpace.getBitWidth());
5549 max = Qualifiers::MaxAddressSpace - LangAS::FirstTargetAddressSpace;
5550 if (addrSpace > max) {
5551 S.Diag(Attr.getLoc(), diag::err_attribute_address_space_too_high)
5552 << (unsigned)max.getZExtValue() << ASArgExpr->getSourceRange();
5556 ASIdx = static_cast<unsigned>(addrSpace.getZExtValue()) +
5557 LangAS::FirstTargetAddressSpace;
5559 // The keyword-based type attributes imply which address space to use.
5560 switch (Attr.getKind()) {
5561 case AttributeList::AT_OpenCLGlobalAddressSpace:
5562 ASIdx = LangAS::opencl_global; break;
5563 case AttributeList::AT_OpenCLLocalAddressSpace:
5564 ASIdx = LangAS::opencl_local; break;
5565 case AttributeList::AT_OpenCLConstantAddressSpace:
5566 ASIdx = LangAS::opencl_constant; break;
5567 case AttributeList::AT_OpenCLGenericAddressSpace:
5568 ASIdx = LangAS::opencl_generic; break;
5570 assert(Attr.getKind() == AttributeList::AT_OpenCLPrivateAddressSpace);
5575 Type = S.Context.getAddrSpaceQualType(Type, ASIdx);
5578 /// Does this type have a "direct" ownership qualifier? That is,
5579 /// is it written like "__strong id", as opposed to something like
5580 /// "typeof(foo)", where that happens to be strong?
5581 static bool hasDirectOwnershipQualifier(QualType type) {
5582 // Fast path: no qualifier at all.
5583 assert(type.getQualifiers().hasObjCLifetime());
5587 if (const AttributedType *attr = dyn_cast<AttributedType>(type)) {
5588 if (attr->getAttrKind() == AttributedType::attr_objc_ownership)
5591 type = attr->getModifiedType();
5593 // X *__strong (...)
5594 } else if (const ParenType *paren = dyn_cast<ParenType>(type)) {
5595 type = paren->getInnerType();
5597 // That's it for things we want to complain about. In particular,
5598 // we do not want to look through typedefs, typeof(expr),
5599 // typeof(type), or any other way that the type is somehow
5608 /// handleObjCOwnershipTypeAttr - Process an objc_ownership
5609 /// attribute on the specified type.
5611 /// Returns 'true' if the attribute was handled.
5612 static bool handleObjCOwnershipTypeAttr(TypeProcessingState &state,
5613 AttributeList &attr,
5615 bool NonObjCPointer = false;
5617 if (!type->isDependentType() && !type->isUndeducedType()) {
5618 if (const PointerType *ptr = type->getAs<PointerType>()) {
5619 QualType pointee = ptr->getPointeeType();
5620 if (pointee->isObjCRetainableType() || pointee->isPointerType())
5622 // It is important not to lose the source info that there was an attribute
5623 // applied to non-objc pointer. We will create an attributed type but
5624 // its type will be the same as the original type.
5625 NonObjCPointer = true;
5626 } else if (!type->isObjCRetainableType()) {
5630 // Don't accept an ownership attribute in the declspec if it would
5631 // just be the return type of a block pointer.
5632 if (state.isProcessingDeclSpec()) {
5633 Declarator &D = state.getDeclarator();
5634 if (maybeMovePastReturnType(D, D.getNumTypeObjects(),
5635 /*onlyBlockPointers=*/true))
5640 Sema &S = state.getSema();
5641 SourceLocation AttrLoc = attr.getLoc();
5642 if (AttrLoc.isMacroID())
5643 AttrLoc = S.getSourceManager().getImmediateExpansionRange(AttrLoc).first;
5645 if (!attr.isArgIdent(0)) {
5646 S.Diag(AttrLoc, diag::err_attribute_argument_type)
5647 << attr.getName() << AANT_ArgumentString;
5652 IdentifierInfo *II = attr.getArgAsIdent(0)->Ident;
5653 Qualifiers::ObjCLifetime lifetime;
5654 if (II->isStr("none"))
5655 lifetime = Qualifiers::OCL_ExplicitNone;
5656 else if (II->isStr("strong"))
5657 lifetime = Qualifiers::OCL_Strong;
5658 else if (II->isStr("weak"))
5659 lifetime = Qualifiers::OCL_Weak;
5660 else if (II->isStr("autoreleasing"))
5661 lifetime = Qualifiers::OCL_Autoreleasing;
5663 S.Diag(AttrLoc, diag::warn_attribute_type_not_supported)
5664 << attr.getName() << II;
5669 // Just ignore lifetime attributes other than __weak and __unsafe_unretained
5670 // outside of ARC mode.
5671 if (!S.getLangOpts().ObjCAutoRefCount &&
5672 lifetime != Qualifiers::OCL_Weak &&
5673 lifetime != Qualifiers::OCL_ExplicitNone) {
5677 SplitQualType underlyingType = type.split();
5679 // Check for redundant/conflicting ownership qualifiers.
5680 if (Qualifiers::ObjCLifetime previousLifetime
5681 = type.getQualifiers().getObjCLifetime()) {
5682 // If it's written directly, that's an error.
5683 if (hasDirectOwnershipQualifier(type)) {
5684 S.Diag(AttrLoc, diag::err_attr_objc_ownership_redundant)
5689 // Otherwise, if the qualifiers actually conflict, pull sugar off
5690 // and remove the ObjCLifetime qualifiers.
5691 if (previousLifetime != lifetime) {
5692 // It's possible to have multiple local ObjCLifetime qualifiers. We
5693 // can't stop after we reach a type that is directly qualified.
5694 const Type *prevTy = nullptr;
5695 while (!prevTy || prevTy != underlyingType.Ty) {
5696 prevTy = underlyingType.Ty;
5697 underlyingType = underlyingType.getSingleStepDesugaredType();
5699 underlyingType.Quals.removeObjCLifetime();
5703 underlyingType.Quals.addObjCLifetime(lifetime);
5705 if (NonObjCPointer) {
5706 StringRef name = attr.getName()->getName();
5708 case Qualifiers::OCL_None:
5709 case Qualifiers::OCL_ExplicitNone:
5711 case Qualifiers::OCL_Strong: name = "__strong"; break;
5712 case Qualifiers::OCL_Weak: name = "__weak"; break;
5713 case Qualifiers::OCL_Autoreleasing: name = "__autoreleasing"; break;
5715 S.Diag(AttrLoc, diag::warn_type_attribute_wrong_type) << name
5716 << TDS_ObjCObjOrBlock << type;
5719 // Don't actually add the __unsafe_unretained qualifier in non-ARC files,
5720 // because having both 'T' and '__unsafe_unretained T' exist in the type
5721 // system causes unfortunate widespread consistency problems. (For example,
5722 // they're not considered compatible types, and we mangle them identicially
5723 // as template arguments.) These problems are all individually fixable,
5724 // but it's easier to just not add the qualifier and instead sniff it out
5725 // in specific places using isObjCInertUnsafeUnretainedType().
5727 // Doing this does means we miss some trivial consistency checks that
5728 // would've triggered in ARC, but that's better than trying to solve all
5729 // the coexistence problems with __unsafe_unretained.
5730 if (!S.getLangOpts().ObjCAutoRefCount &&
5731 lifetime == Qualifiers::OCL_ExplicitNone) {
5732 type = S.Context.getAttributedType(
5733 AttributedType::attr_objc_inert_unsafe_unretained,
5738 QualType origType = type;
5739 if (!NonObjCPointer)
5740 type = S.Context.getQualifiedType(underlyingType);
5742 // If we have a valid source location for the attribute, use an
5743 // AttributedType instead.
5744 if (AttrLoc.isValid())
5745 type = S.Context.getAttributedType(AttributedType::attr_objc_ownership,
5748 auto diagnoseOrDelay = [](Sema &S, SourceLocation loc,
5749 unsigned diagnostic, QualType type) {
5750 if (S.DelayedDiagnostics.shouldDelayDiagnostics()) {
5751 S.DelayedDiagnostics.add(
5752 sema::DelayedDiagnostic::makeForbiddenType(
5753 S.getSourceManager().getExpansionLoc(loc),
5754 diagnostic, type, /*ignored*/ 0));
5756 S.Diag(loc, diagnostic);
5760 // Sometimes, __weak isn't allowed.
5761 if (lifetime == Qualifiers::OCL_Weak &&
5762 !S.getLangOpts().ObjCWeak && !NonObjCPointer) {
5764 // Use a specialized diagnostic if the runtime just doesn't support them.
5765 unsigned diagnostic =
5766 (S.getLangOpts().ObjCWeakRuntime ? diag::err_arc_weak_disabled
5767 : diag::err_arc_weak_no_runtime);
5769 // In any case, delay the diagnostic until we know what we're parsing.
5770 diagnoseOrDelay(S, AttrLoc, diagnostic, type);
5776 // Forbid __weak for class objects marked as
5777 // objc_arc_weak_reference_unavailable
5778 if (lifetime == Qualifiers::OCL_Weak) {
5779 if (const ObjCObjectPointerType *ObjT =
5780 type->getAs<ObjCObjectPointerType>()) {
5781 if (ObjCInterfaceDecl *Class = ObjT->getInterfaceDecl()) {
5782 if (Class->isArcWeakrefUnavailable()) {
5783 S.Diag(AttrLoc, diag::err_arc_unsupported_weak_class);
5784 S.Diag(ObjT->getInterfaceDecl()->getLocation(),
5785 diag::note_class_declared);
5794 /// handleObjCGCTypeAttr - Process the __attribute__((objc_gc)) type
5795 /// attribute on the specified type. Returns true to indicate that
5796 /// the attribute was handled, false to indicate that the type does
5797 /// not permit the attribute.
5798 static bool handleObjCGCTypeAttr(TypeProcessingState &state,
5799 AttributeList &attr,
5801 Sema &S = state.getSema();
5803 // Delay if this isn't some kind of pointer.
5804 if (!type->isPointerType() &&
5805 !type->isObjCObjectPointerType() &&
5806 !type->isBlockPointerType())
5809 if (type.getObjCGCAttr() != Qualifiers::GCNone) {
5810 S.Diag(attr.getLoc(), diag::err_attribute_multiple_objc_gc);
5815 // Check the attribute arguments.
5816 if (!attr.isArgIdent(0)) {
5817 S.Diag(attr.getLoc(), diag::err_attribute_argument_type)
5818 << attr.getName() << AANT_ArgumentString;
5822 Qualifiers::GC GCAttr;
5823 if (attr.getNumArgs() > 1) {
5824 S.Diag(attr.getLoc(), diag::err_attribute_wrong_number_arguments)
5825 << attr.getName() << 1;
5830 IdentifierInfo *II = attr.getArgAsIdent(0)->Ident;
5831 if (II->isStr("weak"))
5832 GCAttr = Qualifiers::Weak;
5833 else if (II->isStr("strong"))
5834 GCAttr = Qualifiers::Strong;
5836 S.Diag(attr.getLoc(), diag::warn_attribute_type_not_supported)
5837 << attr.getName() << II;
5842 QualType origType = type;
5843 type = S.Context.getObjCGCQualType(origType, GCAttr);
5845 // Make an attributed type to preserve the source information.
5846 if (attr.getLoc().isValid())
5847 type = S.Context.getAttributedType(AttributedType::attr_objc_gc,
5854 /// A helper class to unwrap a type down to a function for the
5855 /// purposes of applying attributes there.
5858 /// FunctionTypeUnwrapper unwrapped(SemaRef, T);
5859 /// if (unwrapped.isFunctionType()) {
5860 /// const FunctionType *fn = unwrapped.get();
5861 /// // change fn somehow
5862 /// T = unwrapped.wrap(fn);
5864 struct FunctionTypeUnwrapper {
5876 const FunctionType *Fn;
5877 SmallVector<unsigned char /*WrapKind*/, 8> Stack;
5879 FunctionTypeUnwrapper(Sema &S, QualType T) : Original(T) {
5881 const Type *Ty = T.getTypePtr();
5882 if (isa<FunctionType>(Ty)) {
5883 Fn = cast<FunctionType>(Ty);
5885 } else if (isa<ParenType>(Ty)) {
5886 T = cast<ParenType>(Ty)->getInnerType();
5887 Stack.push_back(Parens);
5888 } else if (isa<PointerType>(Ty)) {
5889 T = cast<PointerType>(Ty)->getPointeeType();
5890 Stack.push_back(Pointer);
5891 } else if (isa<BlockPointerType>(Ty)) {
5892 T = cast<BlockPointerType>(Ty)->getPointeeType();
5893 Stack.push_back(BlockPointer);
5894 } else if (isa<MemberPointerType>(Ty)) {
5895 T = cast<MemberPointerType>(Ty)->getPointeeType();
5896 Stack.push_back(MemberPointer);
5897 } else if (isa<ReferenceType>(Ty)) {
5898 T = cast<ReferenceType>(Ty)->getPointeeType();
5899 Stack.push_back(Reference);
5900 } else if (isa<AttributedType>(Ty)) {
5901 T = cast<AttributedType>(Ty)->getEquivalentType();
5902 Stack.push_back(Attributed);
5904 const Type *DTy = Ty->getUnqualifiedDesugaredType();
5910 T = QualType(DTy, 0);
5911 Stack.push_back(Desugar);
5916 bool isFunctionType() const { return (Fn != nullptr); }
5917 const FunctionType *get() const { return Fn; }
5919 QualType wrap(Sema &S, const FunctionType *New) {
5920 // If T wasn't modified from the unwrapped type, do nothing.
5921 if (New == get()) return Original;
5924 return wrap(S.Context, Original, 0);
5928 QualType wrap(ASTContext &C, QualType Old, unsigned I) {
5929 if (I == Stack.size())
5930 return C.getQualifiedType(Fn, Old.getQualifiers());
5932 // Build up the inner type, applying the qualifiers from the old
5933 // type to the new type.
5934 SplitQualType SplitOld = Old.split();
5936 // As a special case, tail-recurse if there are no qualifiers.
5937 if (SplitOld.Quals.empty())
5938 return wrap(C, SplitOld.Ty, I);
5939 return C.getQualifiedType(wrap(C, SplitOld.Ty, I), SplitOld.Quals);
5942 QualType wrap(ASTContext &C, const Type *Old, unsigned I) {
5943 if (I == Stack.size()) return QualType(Fn, 0);
5945 switch (static_cast<WrapKind>(Stack[I++])) {
5947 // This is the point at which we potentially lose source
5949 return wrap(C, Old->getUnqualifiedDesugaredType(), I);
5952 return wrap(C, cast<AttributedType>(Old)->getEquivalentType(), I);
5955 QualType New = wrap(C, cast<ParenType>(Old)->getInnerType(), I);
5956 return C.getParenType(New);
5960 QualType New = wrap(C, cast<PointerType>(Old)->getPointeeType(), I);
5961 return C.getPointerType(New);
5964 case BlockPointer: {
5965 QualType New = wrap(C, cast<BlockPointerType>(Old)->getPointeeType(),I);
5966 return C.getBlockPointerType(New);
5969 case MemberPointer: {
5970 const MemberPointerType *OldMPT = cast<MemberPointerType>(Old);
5971 QualType New = wrap(C, OldMPT->getPointeeType(), I);
5972 return C.getMemberPointerType(New, OldMPT->getClass());
5976 const ReferenceType *OldRef = cast<ReferenceType>(Old);
5977 QualType New = wrap(C, OldRef->getPointeeType(), I);
5978 if (isa<LValueReferenceType>(OldRef))
5979 return C.getLValueReferenceType(New, OldRef->isSpelledAsLValue());
5981 return C.getRValueReferenceType(New);
5985 llvm_unreachable("unknown wrapping kind");
5988 } // end anonymous namespace
5990 static bool handleMSPointerTypeQualifierAttr(TypeProcessingState &State,
5991 AttributeList &Attr,
5993 Sema &S = State.getSema();
5995 AttributeList::Kind Kind = Attr.getKind();
5996 QualType Desugared = Type;
5997 const AttributedType *AT = dyn_cast<AttributedType>(Type);
5999 AttributedType::Kind CurAttrKind = AT->getAttrKind();
6001 // You cannot specify duplicate type attributes, so if the attribute has
6002 // already been applied, flag it.
6003 if (getAttrListKind(CurAttrKind) == Kind) {
6004 S.Diag(Attr.getLoc(), diag::warn_duplicate_attribute_exact)
6009 // You cannot have both __sptr and __uptr on the same type, nor can you
6010 // have __ptr32 and __ptr64.
6011 if ((CurAttrKind == AttributedType::attr_ptr32 &&
6012 Kind == AttributeList::AT_Ptr64) ||
6013 (CurAttrKind == AttributedType::attr_ptr64 &&
6014 Kind == AttributeList::AT_Ptr32)) {
6015 S.Diag(Attr.getLoc(), diag::err_attributes_are_not_compatible)
6016 << "'__ptr32'" << "'__ptr64'";
6018 } else if ((CurAttrKind == AttributedType::attr_sptr &&
6019 Kind == AttributeList::AT_UPtr) ||
6020 (CurAttrKind == AttributedType::attr_uptr &&
6021 Kind == AttributeList::AT_SPtr)) {
6022 S.Diag(Attr.getLoc(), diag::err_attributes_are_not_compatible)
6023 << "'__sptr'" << "'__uptr'";
6027 Desugared = AT->getEquivalentType();
6028 AT = dyn_cast<AttributedType>(Desugared);
6031 // Pointer type qualifiers can only operate on pointer types, but not
6032 // pointer-to-member types.
6033 if (!isa<PointerType>(Desugared)) {
6034 if (Type->isMemberPointerType())
6035 S.Diag(Attr.getLoc(), diag::err_attribute_no_member_pointers)
6038 S.Diag(Attr.getLoc(), diag::err_attribute_pointers_only)
6039 << Attr.getName() << 0;
6043 AttributedType::Kind TAK;
6045 default: llvm_unreachable("Unknown attribute kind");
6046 case AttributeList::AT_Ptr32: TAK = AttributedType::attr_ptr32; break;
6047 case AttributeList::AT_Ptr64: TAK = AttributedType::attr_ptr64; break;
6048 case AttributeList::AT_SPtr: TAK = AttributedType::attr_sptr; break;
6049 case AttributeList::AT_UPtr: TAK = AttributedType::attr_uptr; break;
6052 Type = S.Context.getAttributedType(TAK, Type, Type);
6056 bool Sema::checkNullabilityTypeSpecifier(QualType &type,
6057 NullabilityKind nullability,
6058 SourceLocation nullabilityLoc,
6059 bool isContextSensitive,
6060 bool allowOnArrayType) {
6061 recordNullabilitySeen(*this, nullabilityLoc);
6063 // Check for existing nullability attributes on the type.
6064 QualType desugared = type;
6065 while (auto attributed = dyn_cast<AttributedType>(desugared.getTypePtr())) {
6066 // Check whether there is already a null
6067 if (auto existingNullability = attributed->getImmediateNullability()) {
6068 // Duplicated nullability.
6069 if (nullability == *existingNullability) {
6070 Diag(nullabilityLoc, diag::warn_nullability_duplicate)
6071 << DiagNullabilityKind(nullability, isContextSensitive)
6072 << FixItHint::CreateRemoval(nullabilityLoc);
6077 // Conflicting nullability.
6078 Diag(nullabilityLoc, diag::err_nullability_conflicting)
6079 << DiagNullabilityKind(nullability, isContextSensitive)
6080 << DiagNullabilityKind(*existingNullability, false);
6084 desugared = attributed->getModifiedType();
6087 // If there is already a different nullability specifier, complain.
6088 // This (unlike the code above) looks through typedefs that might
6089 // have nullability specifiers on them, which means we cannot
6090 // provide a useful Fix-It.
6091 if (auto existingNullability = desugared->getNullability(Context)) {
6092 if (nullability != *existingNullability) {
6093 Diag(nullabilityLoc, diag::err_nullability_conflicting)
6094 << DiagNullabilityKind(nullability, isContextSensitive)
6095 << DiagNullabilityKind(*existingNullability, false);
6097 // Try to find the typedef with the existing nullability specifier.
6098 if (auto typedefType = desugared->getAs<TypedefType>()) {
6099 TypedefNameDecl *typedefDecl = typedefType->getDecl();
6100 QualType underlyingType = typedefDecl->getUnderlyingType();
6101 if (auto typedefNullability
6102 = AttributedType::stripOuterNullability(underlyingType)) {
6103 if (*typedefNullability == *existingNullability) {
6104 Diag(typedefDecl->getLocation(), diag::note_nullability_here)
6105 << DiagNullabilityKind(*existingNullability, false);
6114 // If this definitely isn't a pointer type, reject the specifier.
6115 if (!desugared->canHaveNullability() &&
6116 !(allowOnArrayType && desugared->isArrayType())) {
6117 Diag(nullabilityLoc, diag::err_nullability_nonpointer)
6118 << DiagNullabilityKind(nullability, isContextSensitive) << type;
6122 // For the context-sensitive keywords/Objective-C property
6123 // attributes, require that the type be a single-level pointer.
6124 if (isContextSensitive) {
6125 // Make sure that the pointee isn't itself a pointer type.
6126 const Type *pointeeType;
6127 if (desugared->isArrayType())
6128 pointeeType = desugared->getArrayElementTypeNoTypeQual();
6130 pointeeType = desugared->getPointeeType().getTypePtr();
6132 if (pointeeType->isAnyPointerType() ||
6133 pointeeType->isObjCObjectPointerType() ||
6134 pointeeType->isMemberPointerType()) {
6135 Diag(nullabilityLoc, diag::err_nullability_cs_multilevel)
6136 << DiagNullabilityKind(nullability, true)
6138 Diag(nullabilityLoc, diag::note_nullability_type_specifier)
6139 << DiagNullabilityKind(nullability, false)
6141 << FixItHint::CreateReplacement(nullabilityLoc,
6142 getNullabilitySpelling(nullability));
6147 // Form the attributed type.
6148 type = Context.getAttributedType(
6149 AttributedType::getNullabilityAttrKind(nullability), type, type);
6153 bool Sema::checkObjCKindOfType(QualType &type, SourceLocation loc) {
6154 if (isa<ObjCTypeParamType>(type)) {
6155 // Build the attributed type to record where __kindof occurred.
6156 type = Context.getAttributedType(AttributedType::attr_objc_kindof,
6161 // Find out if it's an Objective-C object or object pointer type;
6162 const ObjCObjectPointerType *ptrType = type->getAs<ObjCObjectPointerType>();
6163 const ObjCObjectType *objType = ptrType ? ptrType->getObjectType()
6164 : type->getAs<ObjCObjectType>();
6166 // If not, we can't apply __kindof.
6168 // FIXME: Handle dependent types that aren't yet object types.
6169 Diag(loc, diag::err_objc_kindof_nonobject)
6174 // Rebuild the "equivalent" type, which pushes __kindof down into
6176 // There is no need to apply kindof on an unqualified id type.
6177 QualType equivType = Context.getObjCObjectType(
6178 objType->getBaseType(), objType->getTypeArgsAsWritten(),
6179 objType->getProtocols(),
6180 /*isKindOf=*/objType->isObjCUnqualifiedId() ? false : true);
6182 // If we started with an object pointer type, rebuild it.
6184 equivType = Context.getObjCObjectPointerType(equivType);
6185 if (auto nullability = type->getNullability(Context)) {
6186 auto attrKind = AttributedType::getNullabilityAttrKind(*nullability);
6187 equivType = Context.getAttributedType(attrKind, equivType, equivType);
6191 // Build the attributed type to record where __kindof occurred.
6192 type = Context.getAttributedType(AttributedType::attr_objc_kindof,
6199 /// Map a nullability attribute kind to a nullability kind.
6200 static NullabilityKind mapNullabilityAttrKind(AttributeList::Kind kind) {
6202 case AttributeList::AT_TypeNonNull:
6203 return NullabilityKind::NonNull;
6205 case AttributeList::AT_TypeNullable:
6206 return NullabilityKind::Nullable;
6208 case AttributeList::AT_TypeNullUnspecified:
6209 return NullabilityKind::Unspecified;
6212 llvm_unreachable("not a nullability attribute kind");
6216 /// Distribute a nullability type attribute that cannot be applied to
6217 /// the type specifier to a pointer, block pointer, or member pointer
6218 /// declarator, complaining if necessary.
6220 /// \returns true if the nullability annotation was distributed, false
6222 static bool distributeNullabilityTypeAttr(TypeProcessingState &state,
6224 AttributeList &attr) {
6225 Declarator &declarator = state.getDeclarator();
6227 /// Attempt to move the attribute to the specified chunk.
6228 auto moveToChunk = [&](DeclaratorChunk &chunk, bool inFunction) -> bool {
6229 // If there is already a nullability attribute there, don't add
6231 if (hasNullabilityAttr(chunk.getAttrListRef()))
6234 // Complain about the nullability qualifier being in the wrong
6241 PK_MemberFunctionPointer,
6243 = chunk.Kind == DeclaratorChunk::Pointer ? (inFunction ? PK_FunctionPointer
6245 : chunk.Kind == DeclaratorChunk::BlockPointer ? PK_BlockPointer
6246 : inFunction? PK_MemberFunctionPointer : PK_MemberPointer;
6248 auto diag = state.getSema().Diag(attr.getLoc(),
6249 diag::warn_nullability_declspec)
6250 << DiagNullabilityKind(mapNullabilityAttrKind(attr.getKind()),
6251 attr.isContextSensitiveKeywordAttribute())
6253 << static_cast<unsigned>(pointerKind);
6255 // FIXME: MemberPointer chunks don't carry the location of the *.
6256 if (chunk.Kind != DeclaratorChunk::MemberPointer) {
6257 diag << FixItHint::CreateRemoval(attr.getLoc())
6258 << FixItHint::CreateInsertion(
6259 state.getSema().getPreprocessor()
6260 .getLocForEndOfToken(chunk.Loc),
6261 " " + attr.getName()->getName().str() + " ");
6264 moveAttrFromListToList(attr, state.getCurrentAttrListRef(),
6265 chunk.getAttrListRef());
6269 // Move it to the outermost pointer, member pointer, or block
6270 // pointer declarator.
6271 for (unsigned i = state.getCurrentChunkIndex(); i != 0; --i) {
6272 DeclaratorChunk &chunk = declarator.getTypeObject(i-1);
6273 switch (chunk.Kind) {
6274 case DeclaratorChunk::Pointer:
6275 case DeclaratorChunk::BlockPointer:
6276 case DeclaratorChunk::MemberPointer:
6277 return moveToChunk(chunk, false);
6279 case DeclaratorChunk::Paren:
6280 case DeclaratorChunk::Array:
6283 case DeclaratorChunk::Function:
6284 // Try to move past the return type to a function/block/member
6285 // function pointer.
6286 if (DeclaratorChunk *dest = maybeMovePastReturnType(
6288 /*onlyBlockPointers=*/false)) {
6289 return moveToChunk(*dest, true);
6294 // Don't walk through these.
6295 case DeclaratorChunk::Reference:
6296 case DeclaratorChunk::Pipe:
6304 static AttributedType::Kind getCCTypeAttrKind(AttributeList &Attr) {
6305 assert(!Attr.isInvalid());
6306 switch (Attr.getKind()) {
6308 llvm_unreachable("not a calling convention attribute");
6309 case AttributeList::AT_CDecl:
6310 return AttributedType::attr_cdecl;
6311 case AttributeList::AT_FastCall:
6312 return AttributedType::attr_fastcall;
6313 case AttributeList::AT_StdCall:
6314 return AttributedType::attr_stdcall;
6315 case AttributeList::AT_ThisCall:
6316 return AttributedType::attr_thiscall;
6317 case AttributeList::AT_RegCall:
6318 return AttributedType::attr_regcall;
6319 case AttributeList::AT_Pascal:
6320 return AttributedType::attr_pascal;
6321 case AttributeList::AT_SwiftCall:
6322 return AttributedType::attr_swiftcall;
6323 case AttributeList::AT_VectorCall:
6324 return AttributedType::attr_vectorcall;
6325 case AttributeList::AT_Pcs: {
6326 // The attribute may have had a fixit applied where we treated an
6327 // identifier as a string literal. The contents of the string are valid,
6328 // but the form may not be.
6330 if (Attr.isArgExpr(0))
6331 Str = cast<StringLiteral>(Attr.getArgAsExpr(0))->getString();
6333 Str = Attr.getArgAsIdent(0)->Ident->getName();
6334 return llvm::StringSwitch<AttributedType::Kind>(Str)
6335 .Case("aapcs", AttributedType::attr_pcs)
6336 .Case("aapcs-vfp", AttributedType::attr_pcs_vfp);
6338 case AttributeList::AT_IntelOclBicc:
6339 return AttributedType::attr_inteloclbicc;
6340 case AttributeList::AT_MSABI:
6341 return AttributedType::attr_ms_abi;
6342 case AttributeList::AT_SysVABI:
6343 return AttributedType::attr_sysv_abi;
6344 case AttributeList::AT_PreserveMost:
6345 return AttributedType::attr_preserve_most;
6346 case AttributeList::AT_PreserveAll:
6347 return AttributedType::attr_preserve_all;
6349 llvm_unreachable("unexpected attribute kind!");
6352 /// Process an individual function attribute. Returns true to
6353 /// indicate that the attribute was handled, false if it wasn't.
6354 static bool handleFunctionTypeAttr(TypeProcessingState &state,
6355 AttributeList &attr,
6357 Sema &S = state.getSema();
6359 FunctionTypeUnwrapper unwrapped(S, type);
6361 if (attr.getKind() == AttributeList::AT_NoReturn) {
6362 if (S.CheckNoReturnAttr(attr))
6365 // Delay if this is not a function type.
6366 if (!unwrapped.isFunctionType())
6369 // Otherwise we can process right away.
6370 FunctionType::ExtInfo EI = unwrapped.get()->getExtInfo().withNoReturn(true);
6371 type = unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI));
6375 // ns_returns_retained is not always a type attribute, but if we got
6376 // here, we're treating it as one right now.
6377 if (attr.getKind() == AttributeList::AT_NSReturnsRetained) {
6378 if (attr.getNumArgs()) return true;
6380 // Delay if this is not a function type.
6381 if (!unwrapped.isFunctionType())
6384 // Check whether the return type is reasonable.
6385 if (S.checkNSReturnsRetainedReturnType(attr.getLoc(),
6386 unwrapped.get()->getReturnType()))
6389 // Only actually change the underlying type in ARC builds.
6390 QualType origType = type;
6391 if (state.getSema().getLangOpts().ObjCAutoRefCount) {
6392 FunctionType::ExtInfo EI
6393 = unwrapped.get()->getExtInfo().withProducesResult(true);
6394 type = unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI));
6396 type = S.Context.getAttributedType(AttributedType::attr_ns_returns_retained,
6401 if (attr.getKind() == AttributeList::AT_AnyX86NoCallerSavedRegisters) {
6402 if (S.CheckNoCallerSavedRegsAttr(attr))
6405 // Delay if this is not a function type.
6406 if (!unwrapped.isFunctionType())
6409 FunctionType::ExtInfo EI =
6410 unwrapped.get()->getExtInfo().withNoCallerSavedRegs(true);
6411 type = unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI));
6415 if (attr.getKind() == AttributeList::AT_Regparm) {
6417 if (S.CheckRegparmAttr(attr, value))
6420 // Delay if this is not a function type.
6421 if (!unwrapped.isFunctionType())
6424 // Diagnose regparm with fastcall.
6425 const FunctionType *fn = unwrapped.get();
6426 CallingConv CC = fn->getCallConv();
6427 if (CC == CC_X86FastCall) {
6428 S.Diag(attr.getLoc(), diag::err_attributes_are_not_compatible)
6429 << FunctionType::getNameForCallConv(CC)
6435 FunctionType::ExtInfo EI =
6436 unwrapped.get()->getExtInfo().withRegParm(value);
6437 type = unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI));
6441 // Delay if the type didn't work out to a function.
6442 if (!unwrapped.isFunctionType()) return false;
6444 // Otherwise, a calling convention.
6446 if (S.CheckCallingConvAttr(attr, CC))
6449 const FunctionType *fn = unwrapped.get();
6450 CallingConv CCOld = fn->getCallConv();
6451 AttributedType::Kind CCAttrKind = getCCTypeAttrKind(attr);
6454 // Error out on when there's already an attribute on the type
6455 // and the CCs don't match.
6456 const AttributedType *AT = S.getCallingConvAttributedType(type);
6457 if (AT && AT->getAttrKind() != CCAttrKind) {
6458 S.Diag(attr.getLoc(), diag::err_attributes_are_not_compatible)
6459 << FunctionType::getNameForCallConv(CC)
6460 << FunctionType::getNameForCallConv(CCOld);
6466 // Diagnose use of variadic functions with calling conventions that
6467 // don't support them (e.g. because they're callee-cleanup).
6468 // We delay warning about this on unprototyped function declarations
6469 // until after redeclaration checking, just in case we pick up a
6470 // prototype that way. And apparently we also "delay" warning about
6471 // unprototyped function types in general, despite not necessarily having
6472 // much ability to diagnose it later.
6473 if (!supportsVariadicCall(CC)) {
6474 const FunctionProtoType *FnP = dyn_cast<FunctionProtoType>(fn);
6475 if (FnP && FnP->isVariadic()) {
6476 unsigned DiagID = diag::err_cconv_varargs;
6478 // stdcall and fastcall are ignored with a warning for GCC and MS
6480 bool IsInvalid = true;
6481 if (CC == CC_X86StdCall || CC == CC_X86FastCall) {
6482 DiagID = diag::warn_cconv_varargs;
6486 S.Diag(attr.getLoc(), DiagID) << FunctionType::getNameForCallConv(CC);
6487 if (IsInvalid) attr.setInvalid();
6492 // Also diagnose fastcall with regparm.
6493 if (CC == CC_X86FastCall && fn->getHasRegParm()) {
6494 S.Diag(attr.getLoc(), diag::err_attributes_are_not_compatible)
6495 << "regparm" << FunctionType::getNameForCallConv(CC_X86FastCall);
6500 // Modify the CC from the wrapped function type, wrap it all back, and then
6501 // wrap the whole thing in an AttributedType as written. The modified type
6502 // might have a different CC if we ignored the attribute.
6503 QualType Equivalent;
6507 auto EI = unwrapped.get()->getExtInfo().withCallingConv(CC);
6509 unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI));
6511 type = S.Context.getAttributedType(CCAttrKind, type, Equivalent);
6515 bool Sema::hasExplicitCallingConv(QualType &T) {
6516 QualType R = T.IgnoreParens();
6517 while (const AttributedType *AT = dyn_cast<AttributedType>(R)) {
6518 if (AT->isCallingConv())
6520 R = AT->getModifiedType().IgnoreParens();
6525 void Sema::adjustMemberFunctionCC(QualType &T, bool IsStatic, bool IsCtorOrDtor,
6526 SourceLocation Loc) {
6527 FunctionTypeUnwrapper Unwrapped(*this, T);
6528 const FunctionType *FT = Unwrapped.get();
6529 bool IsVariadic = (isa<FunctionProtoType>(FT) &&
6530 cast<FunctionProtoType>(FT)->isVariadic());
6531 CallingConv CurCC = FT->getCallConv();
6532 CallingConv ToCC = Context.getDefaultCallingConvention(IsVariadic, !IsStatic);
6537 // MS compiler ignores explicit calling convention attributes on structors. We
6538 // should do the same.
6539 if (Context.getTargetInfo().getCXXABI().isMicrosoft() && IsCtorOrDtor) {
6540 // Issue a warning on ignored calling convention -- except of __stdcall.
6541 // Again, this is what MS compiler does.
6542 if (CurCC != CC_X86StdCall)
6543 Diag(Loc, diag::warn_cconv_structors)
6544 << FunctionType::getNameForCallConv(CurCC);
6545 // Default adjustment.
6547 // Only adjust types with the default convention. For example, on Windows
6548 // we should adjust a __cdecl type to __thiscall for instance methods, and a
6549 // __thiscall type to __cdecl for static methods.
6550 CallingConv DefaultCC =
6551 Context.getDefaultCallingConvention(IsVariadic, IsStatic);
6553 if (CurCC != DefaultCC || DefaultCC == ToCC)
6556 if (hasExplicitCallingConv(T))
6560 FT = Context.adjustFunctionType(FT, FT->getExtInfo().withCallingConv(ToCC));
6561 QualType Wrapped = Unwrapped.wrap(*this, FT);
6562 T = Context.getAdjustedType(T, Wrapped);
6565 /// HandleVectorSizeAttribute - this attribute is only applicable to integral
6566 /// and float scalars, although arrays, pointers, and function return values are
6567 /// allowed in conjunction with this construct. Aggregates with this attribute
6568 /// are invalid, even if they are of the same size as a corresponding scalar.
6569 /// The raw attribute should contain precisely 1 argument, the vector size for
6570 /// the variable, measured in bytes. If curType and rawAttr are well formed,
6571 /// this routine will return a new vector type.
6572 static void HandleVectorSizeAttr(QualType& CurType, const AttributeList &Attr,
6574 // Check the attribute arguments.
6575 if (Attr.getNumArgs() != 1) {
6576 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments)
6577 << Attr.getName() << 1;
6581 Expr *sizeExpr = static_cast<Expr *>(Attr.getArgAsExpr(0));
6582 llvm::APSInt vecSize(32);
6583 if (sizeExpr->isTypeDependent() || sizeExpr->isValueDependent() ||
6584 !sizeExpr->isIntegerConstantExpr(vecSize, S.Context)) {
6585 S.Diag(Attr.getLoc(), diag::err_attribute_argument_type)
6586 << Attr.getName() << AANT_ArgumentIntegerConstant
6587 << sizeExpr->getSourceRange();
6591 // The base type must be integer (not Boolean or enumeration) or float, and
6592 // can't already be a vector.
6593 if (!CurType->isBuiltinType() || CurType->isBooleanType() ||
6594 (!CurType->isIntegerType() && !CurType->isRealFloatingType())) {
6595 S.Diag(Attr.getLoc(), diag::err_attribute_invalid_vector_type) << CurType;
6599 unsigned typeSize = static_cast<unsigned>(S.Context.getTypeSize(CurType));
6600 // vecSize is specified in bytes - convert to bits.
6601 unsigned vectorSize = static_cast<unsigned>(vecSize.getZExtValue() * 8);
6603 // the vector size needs to be an integral multiple of the type size.
6604 if (vectorSize % typeSize) {
6605 S.Diag(Attr.getLoc(), diag::err_attribute_invalid_size)
6606 << sizeExpr->getSourceRange();
6610 if (VectorType::isVectorSizeTooLarge(vectorSize / typeSize)) {
6611 S.Diag(Attr.getLoc(), diag::err_attribute_size_too_large)
6612 << sizeExpr->getSourceRange();
6616 if (vectorSize == 0) {
6617 S.Diag(Attr.getLoc(), diag::err_attribute_zero_size)
6618 << sizeExpr->getSourceRange();
6623 // Success! Instantiate the vector type, the number of elements is > 0, and
6624 // not required to be a power of 2, unlike GCC.
6625 CurType = S.Context.getVectorType(CurType, vectorSize/typeSize,
6626 VectorType::GenericVector);
6629 /// \brief Process the OpenCL-like ext_vector_type attribute when it occurs on
6631 static void HandleExtVectorTypeAttr(QualType &CurType,
6632 const AttributeList &Attr,
6634 // check the attribute arguments.
6635 if (Attr.getNumArgs() != 1) {
6636 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments)
6637 << Attr.getName() << 1;
6643 // Special case where the argument is a template id.
6644 if (Attr.isArgIdent(0)) {
6646 SourceLocation TemplateKWLoc;
6648 id.setIdentifier(Attr.getArgAsIdent(0)->Ident, Attr.getLoc());
6650 ExprResult Size = S.ActOnIdExpression(S.getCurScope(), SS, TemplateKWLoc,
6652 if (Size.isInvalid())
6655 sizeExpr = Size.get();
6657 sizeExpr = Attr.getArgAsExpr(0);
6660 // Create the vector type.
6661 QualType T = S.BuildExtVectorType(CurType, sizeExpr, Attr.getLoc());
6666 static bool isPermittedNeonBaseType(QualType &Ty,
6667 VectorType::VectorKind VecKind, Sema &S) {
6668 const BuiltinType *BTy = Ty->getAs<BuiltinType>();
6672 llvm::Triple Triple = S.Context.getTargetInfo().getTriple();
6674 // Signed poly is mathematically wrong, but has been baked into some ABIs by
6676 bool IsPolyUnsigned = Triple.getArch() == llvm::Triple::aarch64 ||
6677 Triple.getArch() == llvm::Triple::aarch64_be;
6678 if (VecKind == VectorType::NeonPolyVector) {
6679 if (IsPolyUnsigned) {
6680 // AArch64 polynomial vectors are unsigned and support poly64.
6681 return BTy->getKind() == BuiltinType::UChar ||
6682 BTy->getKind() == BuiltinType::UShort ||
6683 BTy->getKind() == BuiltinType::ULong ||
6684 BTy->getKind() == BuiltinType::ULongLong;
6686 // AArch32 polynomial vector are signed.
6687 return BTy->getKind() == BuiltinType::SChar ||
6688 BTy->getKind() == BuiltinType::Short;
6692 // Non-polynomial vector types: the usual suspects are allowed, as well as
6693 // float64_t on AArch64.
6694 bool Is64Bit = Triple.getArch() == llvm::Triple::aarch64 ||
6695 Triple.getArch() == llvm::Triple::aarch64_be;
6697 if (Is64Bit && BTy->getKind() == BuiltinType::Double)
6700 return BTy->getKind() == BuiltinType::SChar ||
6701 BTy->getKind() == BuiltinType::UChar ||
6702 BTy->getKind() == BuiltinType::Short ||
6703 BTy->getKind() == BuiltinType::UShort ||
6704 BTy->getKind() == BuiltinType::Int ||
6705 BTy->getKind() == BuiltinType::UInt ||
6706 BTy->getKind() == BuiltinType::Long ||
6707 BTy->getKind() == BuiltinType::ULong ||
6708 BTy->getKind() == BuiltinType::LongLong ||
6709 BTy->getKind() == BuiltinType::ULongLong ||
6710 BTy->getKind() == BuiltinType::Float ||
6711 BTy->getKind() == BuiltinType::Half;
6714 /// HandleNeonVectorTypeAttr - The "neon_vector_type" and
6715 /// "neon_polyvector_type" attributes are used to create vector types that
6716 /// are mangled according to ARM's ABI. Otherwise, these types are identical
6717 /// to those created with the "vector_size" attribute. Unlike "vector_size"
6718 /// the argument to these Neon attributes is the number of vector elements,
6719 /// not the vector size in bytes. The vector width and element type must
6720 /// match one of the standard Neon vector types.
6721 static void HandleNeonVectorTypeAttr(QualType& CurType,
6722 const AttributeList &Attr, Sema &S,
6723 VectorType::VectorKind VecKind) {
6724 // Target must have NEON
6725 if (!S.Context.getTargetInfo().hasFeature("neon")) {
6726 S.Diag(Attr.getLoc(), diag::err_attribute_unsupported) << Attr.getName();
6730 // Check the attribute arguments.
6731 if (Attr.getNumArgs() != 1) {
6732 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments)
6733 << Attr.getName() << 1;
6737 // The number of elements must be an ICE.
6738 Expr *numEltsExpr = static_cast<Expr *>(Attr.getArgAsExpr(0));
6739 llvm::APSInt numEltsInt(32);
6740 if (numEltsExpr->isTypeDependent() || numEltsExpr->isValueDependent() ||
6741 !numEltsExpr->isIntegerConstantExpr(numEltsInt, S.Context)) {
6742 S.Diag(Attr.getLoc(), diag::err_attribute_argument_type)
6743 << Attr.getName() << AANT_ArgumentIntegerConstant
6744 << numEltsExpr->getSourceRange();
6748 // Only certain element types are supported for Neon vectors.
6749 if (!isPermittedNeonBaseType(CurType, VecKind, S)) {
6750 S.Diag(Attr.getLoc(), diag::err_attribute_invalid_vector_type) << CurType;
6755 // The total size of the vector must be 64 or 128 bits.
6756 unsigned typeSize = static_cast<unsigned>(S.Context.getTypeSize(CurType));
6757 unsigned numElts = static_cast<unsigned>(numEltsInt.getZExtValue());
6758 unsigned vecSize = typeSize * numElts;
6759 if (vecSize != 64 && vecSize != 128) {
6760 S.Diag(Attr.getLoc(), diag::err_attribute_bad_neon_vector_size) << CurType;
6765 CurType = S.Context.getVectorType(CurType, numElts, VecKind);
6768 /// Handle OpenCL Access Qualifier Attribute.
6769 static void HandleOpenCLAccessAttr(QualType &CurType, const AttributeList &Attr,
6771 // OpenCL v2.0 s6.6 - Access qualifier can be used only for image and pipe type.
6772 if (!(CurType->isImageType() || CurType->isPipeType())) {
6773 S.Diag(Attr.getLoc(), diag::err_opencl_invalid_access_qualifier);
6778 if (const TypedefType* TypedefTy = CurType->getAs<TypedefType>()) {
6779 QualType PointeeTy = TypedefTy->desugar();
6780 S.Diag(Attr.getLoc(), diag::err_opencl_multiple_access_qualifiers);
6782 std::string PrevAccessQual;
6783 switch (cast<BuiltinType>(PointeeTy.getTypePtr())->getKind()) {
6784 #define IMAGE_TYPE(ImgType, Id, SingletonId, Access, Suffix) \
6785 case BuiltinType::Id: \
6786 PrevAccessQual = #Access; \
6788 #include "clang/Basic/OpenCLImageTypes.def"
6790 assert(0 && "Unable to find corresponding image type.");
6793 S.Diag(TypedefTy->getDecl()->getLocStart(),
6794 diag::note_opencl_typedef_access_qualifier) << PrevAccessQual;
6795 } else if (CurType->isPipeType()) {
6796 if (Attr.getSemanticSpelling() == OpenCLAccessAttr::Keyword_write_only) {
6797 QualType ElemType = CurType->getAs<PipeType>()->getElementType();
6798 CurType = S.Context.getWritePipeType(ElemType);
6803 static void processTypeAttrs(TypeProcessingState &state, QualType &type,
6804 TypeAttrLocation TAL, AttributeList *attrs) {
6805 // Scan through and apply attributes to this type where it makes sense. Some
6806 // attributes (such as __address_space__, __vector_size__, etc) apply to the
6807 // type, but others can be present in the type specifiers even though they
6808 // apply to the decl. Here we apply type attributes and ignore the rest.
6810 bool hasOpenCLAddressSpace = false;
6812 AttributeList &attr = *attrs;
6813 attrs = attr.getNext(); // reset to the next here due to early loop continue
6816 // Skip attributes that were marked to be invalid.
6817 if (attr.isInvalid())
6820 if (attr.isCXX11Attribute()) {
6821 // [[gnu::...]] attributes are treated as declaration attributes, so may
6822 // not appertain to a DeclaratorChunk, even if we handle them as type
6824 if (attr.getScopeName() && attr.getScopeName()->isStr("gnu")) {
6825 if (TAL == TAL_DeclChunk) {
6826 state.getSema().Diag(attr.getLoc(),
6827 diag::warn_cxx11_gnu_attribute_on_type)
6831 } else if (TAL != TAL_DeclChunk) {
6832 // Otherwise, only consider type processing for a C++11 attribute if
6833 // it's actually been applied to a type.
6838 // If this is an attribute we can handle, do so now,
6839 // otherwise, add it to the FnAttrs list for rechaining.
6840 switch (attr.getKind()) {
6842 // A C++11 attribute on a declarator chunk must appertain to a type.
6843 if (attr.isCXX11Attribute() && TAL == TAL_DeclChunk) {
6844 state.getSema().Diag(attr.getLoc(), diag::err_attribute_not_type_attr)
6846 attr.setUsedAsTypeAttr();
6850 case AttributeList::UnknownAttribute:
6851 if (attr.isCXX11Attribute() && TAL == TAL_DeclChunk)
6852 state.getSema().Diag(attr.getLoc(),
6853 diag::warn_unknown_attribute_ignored)
6857 case AttributeList::IgnoredAttribute:
6860 case AttributeList::AT_MayAlias:
6861 // FIXME: This attribute needs to actually be handled, but if we ignore
6862 // it it breaks large amounts of Linux software.
6863 attr.setUsedAsTypeAttr();
6865 case AttributeList::AT_OpenCLPrivateAddressSpace:
6866 case AttributeList::AT_OpenCLGlobalAddressSpace:
6867 case AttributeList::AT_OpenCLLocalAddressSpace:
6868 case AttributeList::AT_OpenCLConstantAddressSpace:
6869 case AttributeList::AT_OpenCLGenericAddressSpace:
6870 case AttributeList::AT_AddressSpace:
6871 HandleAddressSpaceTypeAttribute(type, attr, state.getSema());
6872 attr.setUsedAsTypeAttr();
6873 hasOpenCLAddressSpace = true;
6875 OBJC_POINTER_TYPE_ATTRS_CASELIST:
6876 if (!handleObjCPointerTypeAttr(state, attr, type))
6877 distributeObjCPointerTypeAttr(state, attr, type);
6878 attr.setUsedAsTypeAttr();
6880 case AttributeList::AT_VectorSize:
6881 HandleVectorSizeAttr(type, attr, state.getSema());
6882 attr.setUsedAsTypeAttr();
6884 case AttributeList::AT_ExtVectorType:
6885 HandleExtVectorTypeAttr(type, attr, state.getSema());
6886 attr.setUsedAsTypeAttr();
6888 case AttributeList::AT_NeonVectorType:
6889 HandleNeonVectorTypeAttr(type, attr, state.getSema(),
6890 VectorType::NeonVector);
6891 attr.setUsedAsTypeAttr();
6893 case AttributeList::AT_NeonPolyVectorType:
6894 HandleNeonVectorTypeAttr(type, attr, state.getSema(),
6895 VectorType::NeonPolyVector);
6896 attr.setUsedAsTypeAttr();
6898 case AttributeList::AT_OpenCLAccess:
6899 HandleOpenCLAccessAttr(type, attr, state.getSema());
6900 attr.setUsedAsTypeAttr();
6903 MS_TYPE_ATTRS_CASELIST:
6904 if (!handleMSPointerTypeQualifierAttr(state, attr, type))
6905 attr.setUsedAsTypeAttr();
6909 NULLABILITY_TYPE_ATTRS_CASELIST:
6910 // Either add nullability here or try to distribute it. We
6911 // don't want to distribute the nullability specifier past any
6912 // dependent type, because that complicates the user model.
6913 if (type->canHaveNullability() || type->isDependentType() ||
6914 type->isArrayType() ||
6915 !distributeNullabilityTypeAttr(state, type, attr)) {
6917 if (TAL == TAL_DeclChunk)
6918 endIndex = state.getCurrentChunkIndex();
6920 endIndex = state.getDeclarator().getNumTypeObjects();
6921 bool allowOnArrayType =
6922 state.getDeclarator().isPrototypeContext() &&
6923 !hasOuterPointerLikeChunk(state.getDeclarator(), endIndex);
6924 if (state.getSema().checkNullabilityTypeSpecifier(
6926 mapNullabilityAttrKind(attr.getKind()),
6928 attr.isContextSensitiveKeywordAttribute(),
6929 allowOnArrayType)) {
6933 attr.setUsedAsTypeAttr();
6937 case AttributeList::AT_ObjCKindOf:
6938 // '__kindof' must be part of the decl-specifiers.
6945 state.getSema().Diag(attr.getLoc(),
6946 diag::err_objc_kindof_wrong_position)
6947 << FixItHint::CreateRemoval(attr.getLoc())
6948 << FixItHint::CreateInsertion(
6949 state.getDeclarator().getDeclSpec().getLocStart(), "__kindof ");
6953 // Apply it regardless.
6954 if (state.getSema().checkObjCKindOfType(type, attr.getLoc()))
6956 attr.setUsedAsTypeAttr();
6959 FUNCTION_TYPE_ATTRS_CASELIST:
6960 attr.setUsedAsTypeAttr();
6962 // Never process function type attributes as part of the
6963 // declaration-specifiers.
6964 if (TAL == TAL_DeclSpec)
6965 distributeFunctionTypeAttrFromDeclSpec(state, attr, type);
6967 // Otherwise, handle the possible delays.
6968 else if (!handleFunctionTypeAttr(state, attr, type))
6969 distributeFunctionTypeAttr(state, attr, type);
6974 // If address space is not set, OpenCL 2.0 defines non private default
6975 // address spaces for some cases:
6976 // OpenCL 2.0, section 6.5:
6977 // The address space for a variable at program scope or a static variable
6978 // inside a function can either be __global or __constant, but defaults to
6979 // __global if not specified.
6981 // Pointers that are declared without pointing to a named address space point
6982 // to the generic address space.
6983 if (state.getSema().getLangOpts().OpenCLVersion >= 200 &&
6984 !hasOpenCLAddressSpace && type.getAddressSpace() == 0 &&
6985 (TAL == TAL_DeclSpec || TAL == TAL_DeclChunk)) {
6986 Declarator &D = state.getDeclarator();
6987 if (state.getCurrentChunkIndex() > 0 &&
6988 (D.getTypeObject(state.getCurrentChunkIndex() - 1).Kind ==
6989 DeclaratorChunk::Pointer ||
6990 D.getTypeObject(state.getCurrentChunkIndex() - 1).Kind ==
6991 DeclaratorChunk::BlockPointer)) {
6992 type = state.getSema().Context.getAddrSpaceQualType(
6993 type, LangAS::opencl_generic);
6994 } else if (state.getCurrentChunkIndex() == 0 &&
6995 D.getContext() == Declarator::FileContext &&
6996 !D.isFunctionDeclarator() && !D.isFunctionDefinition() &&
6997 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef &&
6998 !type->isSamplerT())
6999 type = state.getSema().Context.getAddrSpaceQualType(
7000 type, LangAS::opencl_global);
7001 else if (state.getCurrentChunkIndex() == 0 &&
7002 D.getContext() == Declarator::BlockContext &&
7003 D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_static)
7004 type = state.getSema().Context.getAddrSpaceQualType(
7005 type, LangAS::opencl_global);
7009 void Sema::completeExprArrayBound(Expr *E) {
7010 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E->IgnoreParens())) {
7011 if (VarDecl *Var = dyn_cast<VarDecl>(DRE->getDecl())) {
7012 if (isTemplateInstantiation(Var->getTemplateSpecializationKind())) {
7013 SourceLocation PointOfInstantiation = E->getExprLoc();
7015 if (MemberSpecializationInfo *MSInfo =
7016 Var->getMemberSpecializationInfo()) {
7017 // If we don't already have a point of instantiation, this is it.
7018 if (MSInfo->getPointOfInstantiation().isInvalid()) {
7019 MSInfo->setPointOfInstantiation(PointOfInstantiation);
7021 // This is a modification of an existing AST node. Notify
7023 if (ASTMutationListener *L = getASTMutationListener())
7024 L->StaticDataMemberInstantiated(Var);
7027 VarTemplateSpecializationDecl *VarSpec =
7028 cast<VarTemplateSpecializationDecl>(Var);
7029 if (VarSpec->getPointOfInstantiation().isInvalid())
7030 VarSpec->setPointOfInstantiation(PointOfInstantiation);
7033 InstantiateVariableDefinition(PointOfInstantiation, Var);
7035 // Update the type to the newly instantiated definition's type both
7036 // here and within the expression.
7037 if (VarDecl *Def = Var->getDefinition()) {
7039 QualType T = Def->getType();
7041 // FIXME: Update the type on all intervening expressions.
7045 // We still go on to try to complete the type independently, as it
7046 // may also require instantiations or diagnostics if it remains
7053 /// \brief Ensure that the type of the given expression is complete.
7055 /// This routine checks whether the expression \p E has a complete type. If the
7056 /// expression refers to an instantiable construct, that instantiation is
7057 /// performed as needed to complete its type. Furthermore
7058 /// Sema::RequireCompleteType is called for the expression's type (or in the
7059 /// case of a reference type, the referred-to type).
7061 /// \param E The expression whose type is required to be complete.
7062 /// \param Diagnoser The object that will emit a diagnostic if the type is
7065 /// \returns \c true if the type of \p E is incomplete and diagnosed, \c false
7067 bool Sema::RequireCompleteExprType(Expr *E, TypeDiagnoser &Diagnoser) {
7068 QualType T = E->getType();
7070 // Incomplete array types may be completed by the initializer attached to
7071 // their definitions. For static data members of class templates and for
7072 // variable templates, we need to instantiate the definition to get this
7073 // initializer and complete the type.
7074 if (T->isIncompleteArrayType()) {
7075 completeExprArrayBound(E);
7079 // FIXME: Are there other cases which require instantiating something other
7080 // than the type to complete the type of an expression?
7082 return RequireCompleteType(E->getExprLoc(), T, Diagnoser);
7085 bool Sema::RequireCompleteExprType(Expr *E, unsigned DiagID) {
7086 BoundTypeDiagnoser<> Diagnoser(DiagID);
7087 return RequireCompleteExprType(E, Diagnoser);
7090 /// @brief Ensure that the type T is a complete type.
7092 /// This routine checks whether the type @p T is complete in any
7093 /// context where a complete type is required. If @p T is a complete
7094 /// type, returns false. If @p T is a class template specialization,
7095 /// this routine then attempts to perform class template
7096 /// instantiation. If instantiation fails, or if @p T is incomplete
7097 /// and cannot be completed, issues the diagnostic @p diag (giving it
7098 /// the type @p T) and returns true.
7100 /// @param Loc The location in the source that the incomplete type
7101 /// diagnostic should refer to.
7103 /// @param T The type that this routine is examining for completeness.
7105 /// @returns @c true if @p T is incomplete and a diagnostic was emitted,
7106 /// @c false otherwise.
7107 bool Sema::RequireCompleteType(SourceLocation Loc, QualType T,
7108 TypeDiagnoser &Diagnoser) {
7109 if (RequireCompleteTypeImpl(Loc, T, &Diagnoser))
7111 if (const TagType *Tag = T->getAs<TagType>()) {
7112 if (!Tag->getDecl()->isCompleteDefinitionRequired()) {
7113 Tag->getDecl()->setCompleteDefinitionRequired();
7114 Consumer.HandleTagDeclRequiredDefinition(Tag->getDecl());
7120 bool Sema::hasStructuralCompatLayout(Decl *D, Decl *Suggested) {
7121 llvm::DenseSet<std::pair<Decl *, Decl *>> NonEquivalentDecls;
7125 // FIXME: Add a specific mode for C11 6.2.7/1 in StructuralEquivalenceContext
7126 // and isolate from other C++ specific checks.
7127 StructuralEquivalenceContext Ctx(
7128 D->getASTContext(), Suggested->getASTContext(), NonEquivalentDecls,
7129 false /*StrictTypeSpelling*/, true /*Complain*/,
7130 true /*ErrorOnTagTypeMismatch*/);
7131 return Ctx.IsStructurallyEquivalent(D, Suggested);
7134 /// \brief Determine whether there is any declaration of \p D that was ever a
7135 /// definition (perhaps before module merging) and is currently visible.
7136 /// \param D The definition of the entity.
7137 /// \param Suggested Filled in with the declaration that should be made visible
7138 /// in order to provide a definition of this entity.
7139 /// \param OnlyNeedComplete If \c true, we only need the type to be complete,
7140 /// not defined. This only matters for enums with a fixed underlying
7141 /// type, since in all other cases, a type is complete if and only if it
7143 bool Sema::hasVisibleDefinition(NamedDecl *D, NamedDecl **Suggested,
7144 bool OnlyNeedComplete) {
7145 // Easy case: if we don't have modules, all declarations are visible.
7146 if (!getLangOpts().Modules && !getLangOpts().ModulesLocalVisibility)
7149 // If this definition was instantiated from a template, map back to the
7150 // pattern from which it was instantiated.
7151 if (isa<TagDecl>(D) && cast<TagDecl>(D)->isBeingDefined()) {
7152 // We're in the middle of defining it; this definition should be treated
7155 } else if (auto *RD = dyn_cast<CXXRecordDecl>(D)) {
7156 if (auto *Pattern = RD->getTemplateInstantiationPattern())
7158 D = RD->getDefinition();
7159 } else if (auto *ED = dyn_cast<EnumDecl>(D)) {
7160 if (auto *Pattern = ED->getTemplateInstantiationPattern())
7162 if (OnlyNeedComplete && ED->isFixed()) {
7163 // If the enum has a fixed underlying type, and we're only looking for a
7164 // complete type (not a definition), any visible declaration of it will
7166 *Suggested = nullptr;
7167 for (auto *Redecl : ED->redecls()) {
7168 if (isVisible(Redecl))
7170 if (Redecl->isThisDeclarationADefinition() ||
7171 (Redecl->isCanonicalDecl() && !*Suggested))
7172 *Suggested = Redecl;
7176 D = ED->getDefinition();
7177 } else if (auto *FD = dyn_cast<FunctionDecl>(D)) {
7178 if (auto *Pattern = FD->getTemplateInstantiationPattern())
7180 D = FD->getDefinition();
7181 } else if (auto *VD = dyn_cast<VarDecl>(D)) {
7182 if (auto *Pattern = VD->getTemplateInstantiationPattern())
7184 D = VD->getDefinition();
7186 assert(D && "missing definition for pattern of instantiated definition");
7192 // The external source may have additional definitions of this entity that are
7193 // visible, so complete the redeclaration chain now and ask again.
7194 if (auto *Source = Context.getExternalSource()) {
7195 Source->CompleteRedeclChain(D);
7196 return isVisible(D);
7202 /// Locks in the inheritance model for the given class and all of its bases.
7203 static void assignInheritanceModel(Sema &S, CXXRecordDecl *RD) {
7204 RD = RD->getMostRecentDecl();
7205 if (!RD->hasAttr<MSInheritanceAttr>()) {
7206 MSInheritanceAttr::Spelling IM;
7208 switch (S.MSPointerToMemberRepresentationMethod) {
7209 case LangOptions::PPTMK_BestCase:
7210 IM = RD->calculateInheritanceModel();
7212 case LangOptions::PPTMK_FullGeneralitySingleInheritance:
7213 IM = MSInheritanceAttr::Keyword_single_inheritance;
7215 case LangOptions::PPTMK_FullGeneralityMultipleInheritance:
7216 IM = MSInheritanceAttr::Keyword_multiple_inheritance;
7218 case LangOptions::PPTMK_FullGeneralityVirtualInheritance:
7219 IM = MSInheritanceAttr::Keyword_unspecified_inheritance;
7223 RD->addAttr(MSInheritanceAttr::CreateImplicit(
7224 S.getASTContext(), IM,
7225 /*BestCase=*/S.MSPointerToMemberRepresentationMethod ==
7226 LangOptions::PPTMK_BestCase,
7227 S.ImplicitMSInheritanceAttrLoc.isValid()
7228 ? S.ImplicitMSInheritanceAttrLoc
7229 : RD->getSourceRange()));
7230 S.Consumer.AssignInheritanceModel(RD);
7234 /// \brief The implementation of RequireCompleteType
7235 bool Sema::RequireCompleteTypeImpl(SourceLocation Loc, QualType T,
7236 TypeDiagnoser *Diagnoser) {
7237 // FIXME: Add this assertion to make sure we always get instantiation points.
7238 // assert(!Loc.isInvalid() && "Invalid location in RequireCompleteType");
7239 // FIXME: Add this assertion to help us flush out problems with
7240 // checking for dependent types and type-dependent expressions.
7242 // assert(!T->isDependentType() &&
7243 // "Can't ask whether a dependent type is complete");
7245 // We lock in the inheritance model once somebody has asked us to ensure
7246 // that a pointer-to-member type is complete.
7247 if (Context.getTargetInfo().getCXXABI().isMicrosoft()) {
7248 if (const MemberPointerType *MPTy = T->getAs<MemberPointerType>()) {
7249 if (!MPTy->getClass()->isDependentType()) {
7250 (void)isCompleteType(Loc, QualType(MPTy->getClass(), 0));
7251 assignInheritanceModel(*this, MPTy->getMostRecentCXXRecordDecl());
7256 NamedDecl *Def = nullptr;
7257 bool Incomplete = T->isIncompleteType(&Def);
7259 // Check that any necessary explicit specializations are visible. For an
7260 // enum, we just need the declaration, so don't check this.
7261 if (Def && !isa<EnumDecl>(Def))
7262 checkSpecializationVisibility(Loc, Def);
7264 // If we have a complete type, we're done.
7266 // If we know about the definition but it is not visible, complain.
7267 NamedDecl *SuggestedDef = nullptr;
7269 !hasVisibleDefinition(Def, &SuggestedDef, /*OnlyNeedComplete*/true)) {
7270 // If the user is going to see an error here, recover by making the
7271 // definition visible.
7272 bool TreatAsComplete = Diagnoser && !isSFINAEContext();
7274 diagnoseMissingImport(Loc, SuggestedDef, MissingImportKind::Definition,
7275 /*Recover*/TreatAsComplete);
7276 return !TreatAsComplete;
7282 const TagType *Tag = T->getAs<TagType>();
7283 const ObjCInterfaceType *IFace = T->getAs<ObjCInterfaceType>();
7285 // If there's an unimported definition of this type in a module (for
7286 // instance, because we forward declared it, then imported the definition),
7287 // import that definition now.
7289 // FIXME: What about other cases where an import extends a redeclaration
7290 // chain for a declaration that can be accessed through a mechanism other
7291 // than name lookup (eg, referenced in a template, or a variable whose type
7292 // could be completed by the module)?
7294 // FIXME: Should we map through to the base array element type before
7295 // checking for a tag type?
7298 Tag ? static_cast<NamedDecl *>(Tag->getDecl()) : IFace->getDecl();
7300 // Avoid diagnosing invalid decls as incomplete.
7301 if (D->isInvalidDecl())
7304 // Give the external AST source a chance to complete the type.
7305 if (auto *Source = Context.getExternalSource()) {
7307 Source->CompleteType(Tag->getDecl());
7309 Source->CompleteType(IFace->getDecl());
7311 // If the external source completed the type, go through the motions
7312 // again to ensure we're allowed to use the completed type.
7313 if (!T->isIncompleteType())
7314 return RequireCompleteTypeImpl(Loc, T, Diagnoser);
7318 // If we have a class template specialization or a class member of a
7319 // class template specialization, or an array with known size of such,
7320 // try to instantiate it.
7321 QualType MaybeTemplate = T;
7322 while (const ConstantArrayType *Array
7323 = Context.getAsConstantArrayType(MaybeTemplate))
7324 MaybeTemplate = Array->getElementType();
7325 if (const RecordType *Record = MaybeTemplate->getAs<RecordType>()) {
7326 bool Instantiated = false;
7327 bool Diagnosed = false;
7328 if (ClassTemplateSpecializationDecl *ClassTemplateSpec
7329 = dyn_cast<ClassTemplateSpecializationDecl>(Record->getDecl())) {
7330 if (ClassTemplateSpec->getSpecializationKind() == TSK_Undeclared) {
7331 Diagnosed = InstantiateClassTemplateSpecialization(
7332 Loc, ClassTemplateSpec, TSK_ImplicitInstantiation,
7333 /*Complain=*/Diagnoser);
7334 Instantiated = true;
7336 } else if (CXXRecordDecl *Rec
7337 = dyn_cast<CXXRecordDecl>(Record->getDecl())) {
7338 CXXRecordDecl *Pattern = Rec->getInstantiatedFromMemberClass();
7339 if (!Rec->isBeingDefined() && Pattern) {
7340 MemberSpecializationInfo *MSI = Rec->getMemberSpecializationInfo();
7341 assert(MSI && "Missing member specialization information?");
7342 // This record was instantiated from a class within a template.
7343 if (MSI->getTemplateSpecializationKind() !=
7344 TSK_ExplicitSpecialization) {
7345 Diagnosed = InstantiateClass(Loc, Rec, Pattern,
7346 getTemplateInstantiationArgs(Rec),
7347 TSK_ImplicitInstantiation,
7348 /*Complain=*/Diagnoser);
7349 Instantiated = true;
7355 // Instantiate* might have already complained that the template is not
7356 // defined, if we asked it to.
7357 if (Diagnoser && Diagnosed)
7359 // If we instantiated a definition, check that it's usable, even if
7360 // instantiation produced an error, so that repeated calls to this
7361 // function give consistent answers.
7362 if (!T->isIncompleteType())
7363 return RequireCompleteTypeImpl(Loc, T, Diagnoser);
7367 // FIXME: If we didn't instantiate a definition because of an explicit
7368 // specialization declaration, check that it's visible.
7373 Diagnoser->diagnose(*this, Loc, T);
7375 // If the type was a forward declaration of a class/struct/union
7376 // type, produce a note.
7377 if (Tag && !Tag->getDecl()->isInvalidDecl())
7378 Diag(Tag->getDecl()->getLocation(),
7379 Tag->isBeingDefined() ? diag::note_type_being_defined
7380 : diag::note_forward_declaration)
7381 << QualType(Tag, 0);
7383 // If the Objective-C class was a forward declaration, produce a note.
7384 if (IFace && !IFace->getDecl()->isInvalidDecl())
7385 Diag(IFace->getDecl()->getLocation(), diag::note_forward_class);
7387 // If we have external information that we can use to suggest a fix,
7390 ExternalSource->MaybeDiagnoseMissingCompleteType(Loc, T);
7395 bool Sema::RequireCompleteType(SourceLocation Loc, QualType T,
7397 BoundTypeDiagnoser<> Diagnoser(DiagID);
7398 return RequireCompleteType(Loc, T, Diagnoser);
7401 /// \brief Get diagnostic %select index for tag kind for
7402 /// literal type diagnostic message.
7403 /// WARNING: Indexes apply to particular diagnostics only!
7405 /// \returns diagnostic %select index.
7406 static unsigned getLiteralDiagFromTagKind(TagTypeKind Tag) {
7408 case TTK_Struct: return 0;
7409 case TTK_Interface: return 1;
7410 case TTK_Class: return 2;
7411 default: llvm_unreachable("Invalid tag kind for literal type diagnostic!");
7415 /// @brief Ensure that the type T is a literal type.
7417 /// This routine checks whether the type @p T is a literal type. If @p T is an
7418 /// incomplete type, an attempt is made to complete it. If @p T is a literal
7419 /// type, or @p AllowIncompleteType is true and @p T is an incomplete type,
7420 /// returns false. Otherwise, this routine issues the diagnostic @p PD (giving
7421 /// it the type @p T), along with notes explaining why the type is not a
7422 /// literal type, and returns true.
7424 /// @param Loc The location in the source that the non-literal type
7425 /// diagnostic should refer to.
7427 /// @param T The type that this routine is examining for literalness.
7429 /// @param Diagnoser Emits a diagnostic if T is not a literal type.
7431 /// @returns @c true if @p T is not a literal type and a diagnostic was emitted,
7432 /// @c false otherwise.
7433 bool Sema::RequireLiteralType(SourceLocation Loc, QualType T,
7434 TypeDiagnoser &Diagnoser) {
7435 assert(!T->isDependentType() && "type should not be dependent");
7437 QualType ElemType = Context.getBaseElementType(T);
7438 if ((isCompleteType(Loc, ElemType) || ElemType->isVoidType()) &&
7439 T->isLiteralType(Context))
7442 Diagnoser.diagnose(*this, Loc, T);
7444 if (T->isVariableArrayType())
7447 const RecordType *RT = ElemType->getAs<RecordType>();
7451 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl());
7453 // A partially-defined class type can't be a literal type, because a literal
7454 // class type must have a trivial destructor (which can't be checked until
7455 // the class definition is complete).
7456 if (RequireCompleteType(Loc, ElemType, diag::note_non_literal_incomplete, T))
7459 // If the class has virtual base classes, then it's not an aggregate, and
7460 // cannot have any constexpr constructors or a trivial default constructor,
7461 // so is non-literal. This is better to diagnose than the resulting absence
7462 // of constexpr constructors.
7463 if (RD->getNumVBases()) {
7464 Diag(RD->getLocation(), diag::note_non_literal_virtual_base)
7465 << getLiteralDiagFromTagKind(RD->getTagKind()) << RD->getNumVBases();
7466 for (const auto &I : RD->vbases())
7467 Diag(I.getLocStart(), diag::note_constexpr_virtual_base_here)
7468 << I.getSourceRange();
7469 } else if (!RD->isAggregate() && !RD->hasConstexprNonCopyMoveConstructor() &&
7470 !RD->hasTrivialDefaultConstructor()) {
7471 Diag(RD->getLocation(), diag::note_non_literal_no_constexpr_ctors) << RD;
7472 } else if (RD->hasNonLiteralTypeFieldsOrBases()) {
7473 for (const auto &I : RD->bases()) {
7474 if (!I.getType()->isLiteralType(Context)) {
7475 Diag(I.getLocStart(),
7476 diag::note_non_literal_base_class)
7477 << RD << I.getType() << I.getSourceRange();
7481 for (const auto *I : RD->fields()) {
7482 if (!I->getType()->isLiteralType(Context) ||
7483 I->getType().isVolatileQualified()) {
7484 Diag(I->getLocation(), diag::note_non_literal_field)
7485 << RD << I << I->getType()
7486 << I->getType().isVolatileQualified();
7490 } else if (!RD->hasTrivialDestructor()) {
7491 // All fields and bases are of literal types, so have trivial destructors.
7492 // If this class's destructor is non-trivial it must be user-declared.
7493 CXXDestructorDecl *Dtor = RD->getDestructor();
7494 assert(Dtor && "class has literal fields and bases but no dtor?");
7498 Diag(Dtor->getLocation(), Dtor->isUserProvided() ?
7499 diag::note_non_literal_user_provided_dtor :
7500 diag::note_non_literal_nontrivial_dtor) << RD;
7501 if (!Dtor->isUserProvided())
7502 SpecialMemberIsTrivial(Dtor, CXXDestructor, /*Diagnose*/true);
7508 bool Sema::RequireLiteralType(SourceLocation Loc, QualType T, unsigned DiagID) {
7509 BoundTypeDiagnoser<> Diagnoser(DiagID);
7510 return RequireLiteralType(Loc, T, Diagnoser);
7513 /// \brief Retrieve a version of the type 'T' that is elaborated by Keyword
7514 /// and qualified by the nested-name-specifier contained in SS.
7515 QualType Sema::getElaboratedType(ElaboratedTypeKeyword Keyword,
7516 const CXXScopeSpec &SS, QualType T) {
7519 NestedNameSpecifier *NNS;
7521 NNS = SS.getScopeRep();
7523 if (Keyword == ETK_None)
7527 return Context.getElaboratedType(Keyword, NNS, T);
7530 QualType Sema::BuildTypeofExprType(Expr *E, SourceLocation Loc) {
7531 ExprResult ER = CheckPlaceholderExpr(E);
7532 if (ER.isInvalid()) return QualType();
7535 if (!getLangOpts().CPlusPlus && E->refersToBitField())
7536 Diag(E->getExprLoc(), diag::err_sizeof_alignof_typeof_bitfield) << 2;
7538 if (!E->isTypeDependent()) {
7539 QualType T = E->getType();
7540 if (const TagType *TT = T->getAs<TagType>())
7541 DiagnoseUseOfDecl(TT->getDecl(), E->getExprLoc());
7543 return Context.getTypeOfExprType(E);
7546 /// getDecltypeForExpr - Given an expr, will return the decltype for
7547 /// that expression, according to the rules in C++11
7548 /// [dcl.type.simple]p4 and C++11 [expr.lambda.prim]p18.
7549 static QualType getDecltypeForExpr(Sema &S, Expr *E) {
7550 if (E->isTypeDependent())
7551 return S.Context.DependentTy;
7553 // C++11 [dcl.type.simple]p4:
7554 // The type denoted by decltype(e) is defined as follows:
7556 // - if e is an unparenthesized id-expression or an unparenthesized class
7557 // member access (5.2.5), decltype(e) is the type of the entity named
7558 // by e. If there is no such entity, or if e names a set of overloaded
7559 // functions, the program is ill-formed;
7561 // We apply the same rules for Objective-C ivar and property references.
7562 if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E)) {
7563 if (const ValueDecl *VD = dyn_cast<ValueDecl>(DRE->getDecl()))
7564 return VD->getType();
7565 } else if (const MemberExpr *ME = dyn_cast<MemberExpr>(E)) {
7566 if (const FieldDecl *FD = dyn_cast<FieldDecl>(ME->getMemberDecl()))
7567 return FD->getType();
7568 } else if (const ObjCIvarRefExpr *IR = dyn_cast<ObjCIvarRefExpr>(E)) {
7569 return IR->getDecl()->getType();
7570 } else if (const ObjCPropertyRefExpr *PR = dyn_cast<ObjCPropertyRefExpr>(E)) {
7571 if (PR->isExplicitProperty())
7572 return PR->getExplicitProperty()->getType();
7573 } else if (auto *PE = dyn_cast<PredefinedExpr>(E)) {
7574 return PE->getType();
7577 // C++11 [expr.lambda.prim]p18:
7578 // Every occurrence of decltype((x)) where x is a possibly
7579 // parenthesized id-expression that names an entity of automatic
7580 // storage duration is treated as if x were transformed into an
7581 // access to a corresponding data member of the closure type that
7582 // would have been declared if x were an odr-use of the denoted
7584 using namespace sema;
7585 if (S.getCurLambda()) {
7586 if (isa<ParenExpr>(E)) {
7587 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E->IgnoreParens())) {
7588 if (VarDecl *Var = dyn_cast<VarDecl>(DRE->getDecl())) {
7589 QualType T = S.getCapturedDeclRefType(Var, DRE->getLocation());
7591 return S.Context.getLValueReferenceType(T);
7598 // C++11 [dcl.type.simple]p4:
7600 QualType T = E->getType();
7601 switch (E->getValueKind()) {
7602 // - otherwise, if e is an xvalue, decltype(e) is T&&, where T is the
7604 case VK_XValue: T = S.Context.getRValueReferenceType(T); break;
7605 // - otherwise, if e is an lvalue, decltype(e) is T&, where T is the
7607 case VK_LValue: T = S.Context.getLValueReferenceType(T); break;
7608 // - otherwise, decltype(e) is the type of e.
7609 case VK_RValue: break;
7615 QualType Sema::BuildDecltypeType(Expr *E, SourceLocation Loc,
7616 bool AsUnevaluated) {
7617 ExprResult ER = CheckPlaceholderExpr(E);
7618 if (ER.isInvalid()) return QualType();
7621 if (AsUnevaluated && CodeSynthesisContexts.empty() &&
7622 E->HasSideEffects(Context, false)) {
7623 // The expression operand for decltype is in an unevaluated expression
7624 // context, so side effects could result in unintended consequences.
7625 Diag(E->getExprLoc(), diag::warn_side_effects_unevaluated_context);
7628 return Context.getDecltypeType(E, getDecltypeForExpr(*this, E));
7631 QualType Sema::BuildUnaryTransformType(QualType BaseType,
7632 UnaryTransformType::UTTKind UKind,
7633 SourceLocation Loc) {
7635 case UnaryTransformType::EnumUnderlyingType:
7636 if (!BaseType->isDependentType() && !BaseType->isEnumeralType()) {
7637 Diag(Loc, diag::err_only_enums_have_underlying_types);
7640 QualType Underlying = BaseType;
7641 if (!BaseType->isDependentType()) {
7642 // The enum could be incomplete if we're parsing its definition or
7643 // recovering from an error.
7644 NamedDecl *FwdDecl = nullptr;
7645 if (BaseType->isIncompleteType(&FwdDecl)) {
7646 Diag(Loc, diag::err_underlying_type_of_incomplete_enum) << BaseType;
7647 Diag(FwdDecl->getLocation(), diag::note_forward_declaration) << FwdDecl;
7651 EnumDecl *ED = BaseType->getAs<EnumType>()->getDecl();
7652 assert(ED && "EnumType has no EnumDecl");
7654 DiagnoseUseOfDecl(ED, Loc);
7656 Underlying = ED->getIntegerType();
7657 assert(!Underlying.isNull());
7659 return Context.getUnaryTransformType(BaseType, Underlying,
7660 UnaryTransformType::EnumUnderlyingType);
7663 llvm_unreachable("unknown unary transform type");
7666 QualType Sema::BuildAtomicType(QualType T, SourceLocation Loc) {
7667 if (!T->isDependentType()) {
7668 // FIXME: It isn't entirely clear whether incomplete atomic types
7669 // are allowed or not; for simplicity, ban them for the moment.
7670 if (RequireCompleteType(Loc, T, diag::err_atomic_specifier_bad_type, 0))
7673 int DisallowedKind = -1;
7674 if (T->isArrayType())
7676 else if (T->isFunctionType())
7678 else if (T->isReferenceType())
7680 else if (T->isAtomicType())
7682 else if (T.hasQualifiers())
7684 else if (!T.isTriviallyCopyableType(Context))
7685 // Some other non-trivially-copyable type (probably a C++ class)
7688 if (DisallowedKind != -1) {
7689 Diag(Loc, diag::err_atomic_specifier_bad_type) << DisallowedKind << T;
7693 // FIXME: Do we need any handling for ARC here?
7696 // Build the pointer type.
7697 return Context.getAtomicType(T);