1 //===--- SemaType.cpp - Semantic Analysis for Types -----------------------===//
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
7 //===----------------------------------------------------------------------===//
9 // This file implements type-related semantic analysis.
11 //===----------------------------------------------------------------------===//
13 #include "TypeLocBuilder.h"
14 #include "clang/AST/ASTConsumer.h"
15 #include "clang/AST/ASTContext.h"
16 #include "clang/AST/ASTMutationListener.h"
17 #include "clang/AST/ASTStructuralEquivalence.h"
18 #include "clang/AST/CXXInheritance.h"
19 #include "clang/AST/DeclObjC.h"
20 #include "clang/AST/DeclTemplate.h"
21 #include "clang/AST/Expr.h"
22 #include "clang/AST/TypeLoc.h"
23 #include "clang/AST/TypeLocVisitor.h"
24 #include "clang/Basic/PartialDiagnostic.h"
25 #include "clang/Basic/Specifiers.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/ParsedTemplate.h"
32 #include "clang/Sema/ScopeInfo.h"
33 #include "clang/Sema/SemaInternal.h"
34 #include "clang/Sema/Template.h"
35 #include "clang/Sema/TemplateInstCallback.h"
36 #include "llvm/ADT/SmallPtrSet.h"
37 #include "llvm/ADT/SmallString.h"
38 #include "llvm/ADT/StringSwitch.h"
39 #include "llvm/IR/DerivedTypes.h"
40 #include "llvm/Support/ErrorHandling.h"
43 using namespace clang;
45 enum TypeDiagSelector {
51 /// isOmittedBlockReturnType - Return true if this declarator is missing a
52 /// return type because this is a omitted return type on a block literal.
53 static bool isOmittedBlockReturnType(const Declarator &D) {
54 if (D.getContext() != DeclaratorContext::BlockLiteral ||
55 D.getDeclSpec().hasTypeSpecifier())
58 if (D.getNumTypeObjects() == 0)
59 return true; // ^{ ... }
61 if (D.getNumTypeObjects() == 1 &&
62 D.getTypeObject(0).Kind == DeclaratorChunk::Function)
63 return true; // ^(int X, float Y) { ... }
68 /// diagnoseBadTypeAttribute - Diagnoses a type attribute which
69 /// doesn't apply to the given type.
70 static void diagnoseBadTypeAttribute(Sema &S, const ParsedAttr &attr,
72 TypeDiagSelector WhichType;
73 bool useExpansionLoc = true;
74 switch (attr.getKind()) {
75 case ParsedAttr::AT_ObjCGC:
76 WhichType = TDS_Pointer;
78 case ParsedAttr::AT_ObjCOwnership:
79 WhichType = TDS_ObjCObjOrBlock;
82 // Assume everything else was a function attribute.
83 WhichType = TDS_Function;
84 useExpansionLoc = false;
88 SourceLocation loc = attr.getLoc();
89 StringRef name = attr.getAttrName()->getName();
91 // The GC attributes are usually written with macros; special-case them.
92 IdentifierInfo *II = attr.isArgIdent(0) ? attr.getArgAsIdent(0)->Ident
94 if (useExpansionLoc && loc.isMacroID() && II) {
95 if (II->isStr("strong")) {
96 if (S.findMacroSpelling(loc, "__strong")) name = "__strong";
97 } else if (II->isStr("weak")) {
98 if (S.findMacroSpelling(loc, "__weak")) name = "__weak";
102 S.Diag(loc, diag::warn_type_attribute_wrong_type) << name << WhichType
106 // objc_gc applies to Objective-C pointers or, otherwise, to the
107 // smallest available pointer type (i.e. 'void*' in 'void**').
108 #define OBJC_POINTER_TYPE_ATTRS_CASELIST \
109 case ParsedAttr::AT_ObjCGC: \
110 case ParsedAttr::AT_ObjCOwnership
112 // Calling convention attributes.
113 #define CALLING_CONV_ATTRS_CASELIST \
114 case ParsedAttr::AT_CDecl: \
115 case ParsedAttr::AT_FastCall: \
116 case ParsedAttr::AT_StdCall: \
117 case ParsedAttr::AT_ThisCall: \
118 case ParsedAttr::AT_RegCall: \
119 case ParsedAttr::AT_Pascal: \
120 case ParsedAttr::AT_SwiftCall: \
121 case ParsedAttr::AT_SwiftAsyncCall: \
122 case ParsedAttr::AT_VectorCall: \
123 case ParsedAttr::AT_AArch64VectorPcs: \
124 case ParsedAttr::AT_AArch64SVEPcs: \
125 case ParsedAttr::AT_AMDGPUKernelCall: \
126 case ParsedAttr::AT_MSABI: \
127 case ParsedAttr::AT_SysVABI: \
128 case ParsedAttr::AT_Pcs: \
129 case ParsedAttr::AT_IntelOclBicc: \
130 case ParsedAttr::AT_PreserveMost: \
131 case ParsedAttr::AT_PreserveAll
133 // Function type attributes.
134 #define FUNCTION_TYPE_ATTRS_CASELIST \
135 case ParsedAttr::AT_NSReturnsRetained: \
136 case ParsedAttr::AT_NoReturn: \
137 case ParsedAttr::AT_Regparm: \
138 case ParsedAttr::AT_CmseNSCall: \
139 case ParsedAttr::AT_AnyX86NoCallerSavedRegisters: \
140 case ParsedAttr::AT_AnyX86NoCfCheck: \
141 CALLING_CONV_ATTRS_CASELIST
143 // Microsoft-specific type qualifiers.
144 #define MS_TYPE_ATTRS_CASELIST \
145 case ParsedAttr::AT_Ptr32: \
146 case ParsedAttr::AT_Ptr64: \
147 case ParsedAttr::AT_SPtr: \
148 case ParsedAttr::AT_UPtr
150 // Nullability qualifiers.
151 #define NULLABILITY_TYPE_ATTRS_CASELIST \
152 case ParsedAttr::AT_TypeNonNull: \
153 case ParsedAttr::AT_TypeNullable: \
154 case ParsedAttr::AT_TypeNullableResult: \
155 case ParsedAttr::AT_TypeNullUnspecified
158 /// An object which stores processing state for the entire
159 /// GetTypeForDeclarator process.
160 class TypeProcessingState {
163 /// The declarator being processed.
164 Declarator &declarator;
166 /// The index of the declarator chunk we're currently processing.
167 /// May be the total number of valid chunks, indicating the
171 /// The original set of attributes on the DeclSpec.
172 SmallVector<ParsedAttr *, 2> savedAttrs;
174 /// A list of attributes to diagnose the uselessness of when the
175 /// processing is complete.
176 SmallVector<ParsedAttr *, 2> ignoredTypeAttrs;
178 /// Attributes corresponding to AttributedTypeLocs that we have not yet
180 // FIXME: The two-phase mechanism by which we construct Types and fill
181 // their TypeLocs makes it hard to correctly assign these. We keep the
182 // attributes in creation order as an attempt to make them line up
184 using TypeAttrPair = std::pair<const AttributedType*, const Attr*>;
185 SmallVector<TypeAttrPair, 8> AttrsForTypes;
186 bool AttrsForTypesSorted = true;
188 /// MacroQualifiedTypes mapping to macro expansion locations that will be
189 /// stored in a MacroQualifiedTypeLoc.
190 llvm::DenseMap<const MacroQualifiedType *, SourceLocation> LocsForMacros;
192 /// Flag to indicate we parsed a noderef attribute. This is used for
193 /// validating that noderef was used on a pointer or array.
197 TypeProcessingState(Sema &sema, Declarator &declarator)
198 : sema(sema), declarator(declarator),
199 chunkIndex(declarator.getNumTypeObjects()), parsedNoDeref(false) {}
201 Sema &getSema() const {
205 Declarator &getDeclarator() const {
209 bool isProcessingDeclSpec() const {
210 return chunkIndex == declarator.getNumTypeObjects();
213 unsigned getCurrentChunkIndex() const {
217 void setCurrentChunkIndex(unsigned idx) {
218 assert(idx <= declarator.getNumTypeObjects());
222 ParsedAttributesView &getCurrentAttributes() const {
223 if (isProcessingDeclSpec())
224 return getMutableDeclSpec().getAttributes();
225 return declarator.getTypeObject(chunkIndex).getAttrs();
228 /// Save the current set of attributes on the DeclSpec.
229 void saveDeclSpecAttrs() {
230 // Don't try to save them multiple times.
231 if (!savedAttrs.empty())
234 DeclSpec &spec = getMutableDeclSpec();
235 llvm::append_range(savedAttrs,
236 llvm::make_pointer_range(spec.getAttributes()));
239 /// Record that we had nowhere to put the given type attribute.
240 /// We will diagnose such attributes later.
241 void addIgnoredTypeAttr(ParsedAttr &attr) {
242 ignoredTypeAttrs.push_back(&attr);
245 /// Diagnose all the ignored type attributes, given that the
246 /// declarator worked out to the given type.
247 void diagnoseIgnoredTypeAttrs(QualType type) const {
248 for (auto *Attr : ignoredTypeAttrs)
249 diagnoseBadTypeAttribute(getSema(), *Attr, type);
252 /// Get an attributed type for the given attribute, and remember the Attr
253 /// object so that we can attach it to the AttributedTypeLoc.
254 QualType getAttributedType(Attr *A, QualType ModifiedType,
255 QualType EquivType) {
257 sema.Context.getAttributedType(A->getKind(), ModifiedType, EquivType);
258 AttrsForTypes.push_back({cast<AttributedType>(T.getTypePtr()), A});
259 AttrsForTypesSorted = false;
263 /// Get a BTFTagAttributed type for the btf_type_tag attribute.
264 QualType getBTFTagAttributedType(const BTFTypeTagAttr *BTFAttr,
265 QualType WrappedType) {
266 return sema.Context.getBTFTagAttributedType(BTFAttr, WrappedType);
269 /// Completely replace the \c auto in \p TypeWithAuto by
270 /// \p Replacement. Also replace \p TypeWithAuto in \c TypeAttrPair if
272 QualType ReplaceAutoType(QualType TypeWithAuto, QualType Replacement) {
273 QualType T = sema.ReplaceAutoType(TypeWithAuto, Replacement);
274 if (auto *AttrTy = TypeWithAuto->getAs<AttributedType>()) {
275 // Attributed type still should be an attributed type after replacement.
276 auto *NewAttrTy = cast<AttributedType>(T.getTypePtr());
277 for (TypeAttrPair &A : AttrsForTypes) {
278 if (A.first == AttrTy)
281 AttrsForTypesSorted = false;
286 /// Extract and remove the Attr* for a given attributed type.
287 const Attr *takeAttrForAttributedType(const AttributedType *AT) {
288 if (!AttrsForTypesSorted) {
289 llvm::stable_sort(AttrsForTypes, llvm::less_first());
290 AttrsForTypesSorted = true;
293 // FIXME: This is quadratic if we have lots of reuses of the same
295 for (auto It = std::partition_point(
296 AttrsForTypes.begin(), AttrsForTypes.end(),
297 [=](const TypeAttrPair &A) { return A.first < AT; });
298 It != AttrsForTypes.end() && It->first == AT; ++It) {
300 const Attr *Result = It->second;
301 It->second = nullptr;
306 llvm_unreachable("no Attr* for AttributedType*");
310 getExpansionLocForMacroQualifiedType(const MacroQualifiedType *MQT) const {
311 auto FoundLoc = LocsForMacros.find(MQT);
312 assert(FoundLoc != LocsForMacros.end() &&
313 "Unable to find macro expansion location for MacroQualifedType");
314 return FoundLoc->second;
317 void setExpansionLocForMacroQualifiedType(const MacroQualifiedType *MQT,
318 SourceLocation Loc) {
319 LocsForMacros[MQT] = Loc;
322 void setParsedNoDeref(bool parsed) { parsedNoDeref = parsed; }
324 bool didParseNoDeref() const { return parsedNoDeref; }
326 ~TypeProcessingState() {
327 if (savedAttrs.empty())
330 getMutableDeclSpec().getAttributes().clearListOnly();
331 for (ParsedAttr *AL : savedAttrs)
332 getMutableDeclSpec().getAttributes().addAtEnd(AL);
336 DeclSpec &getMutableDeclSpec() const {
337 return const_cast<DeclSpec&>(declarator.getDeclSpec());
340 } // end anonymous namespace
342 static void moveAttrFromListToList(ParsedAttr &attr,
343 ParsedAttributesView &fromList,
344 ParsedAttributesView &toList) {
345 fromList.remove(&attr);
346 toList.addAtEnd(&attr);
349 /// The location of a type attribute.
350 enum TypeAttrLocation {
351 /// The attribute is in the decl-specifier-seq.
353 /// The attribute is part of a DeclaratorChunk.
355 /// The attribute is immediately after the declaration's name.
359 static void processTypeAttrs(TypeProcessingState &state, QualType &type,
360 TypeAttrLocation TAL,
361 const ParsedAttributesView &attrs);
363 static bool handleFunctionTypeAttr(TypeProcessingState &state, ParsedAttr &attr,
366 static bool handleMSPointerTypeQualifierAttr(TypeProcessingState &state,
367 ParsedAttr &attr, QualType &type);
369 static bool handleObjCGCTypeAttr(TypeProcessingState &state, ParsedAttr &attr,
372 static bool handleObjCOwnershipTypeAttr(TypeProcessingState &state,
373 ParsedAttr &attr, QualType &type);
375 static bool handleObjCPointerTypeAttr(TypeProcessingState &state,
376 ParsedAttr &attr, QualType &type) {
377 if (attr.getKind() == ParsedAttr::AT_ObjCGC)
378 return handleObjCGCTypeAttr(state, attr, type);
379 assert(attr.getKind() == ParsedAttr::AT_ObjCOwnership);
380 return handleObjCOwnershipTypeAttr(state, attr, type);
383 /// Given the index of a declarator chunk, check whether that chunk
384 /// directly specifies the return type of a function and, if so, find
385 /// an appropriate place for it.
387 /// \param i - a notional index which the search will start
388 /// immediately inside
390 /// \param onlyBlockPointers Whether we should only look into block
391 /// pointer types (vs. all pointer types).
392 static DeclaratorChunk *maybeMovePastReturnType(Declarator &declarator,
394 bool onlyBlockPointers) {
395 assert(i <= declarator.getNumTypeObjects());
397 DeclaratorChunk *result = nullptr;
399 // First, look inwards past parens for a function declarator.
400 for (; i != 0; --i) {
401 DeclaratorChunk &fnChunk = declarator.getTypeObject(i-1);
402 switch (fnChunk.Kind) {
403 case DeclaratorChunk::Paren:
406 // If we find anything except a function, bail out.
407 case DeclaratorChunk::Pointer:
408 case DeclaratorChunk::BlockPointer:
409 case DeclaratorChunk::Array:
410 case DeclaratorChunk::Reference:
411 case DeclaratorChunk::MemberPointer:
412 case DeclaratorChunk::Pipe:
415 // If we do find a function declarator, scan inwards from that,
416 // looking for a (block-)pointer declarator.
417 case DeclaratorChunk::Function:
418 for (--i; i != 0; --i) {
419 DeclaratorChunk &ptrChunk = declarator.getTypeObject(i-1);
420 switch (ptrChunk.Kind) {
421 case DeclaratorChunk::Paren:
422 case DeclaratorChunk::Array:
423 case DeclaratorChunk::Function:
424 case DeclaratorChunk::Reference:
425 case DeclaratorChunk::Pipe:
428 case DeclaratorChunk::MemberPointer:
429 case DeclaratorChunk::Pointer:
430 if (onlyBlockPointers)
435 case DeclaratorChunk::BlockPointer:
439 llvm_unreachable("bad declarator chunk kind");
442 // If we run out of declarators doing that, we're done.
445 llvm_unreachable("bad declarator chunk kind");
447 // Okay, reconsider from our new point.
451 // Ran out of chunks, bail out.
455 /// Given that an objc_gc attribute was written somewhere on a
456 /// declaration *other* than on the declarator itself (for which, use
457 /// distributeObjCPointerTypeAttrFromDeclarator), and given that it
458 /// didn't apply in whatever position it was written in, try to move
459 /// it to a more appropriate position.
460 static void distributeObjCPointerTypeAttr(TypeProcessingState &state,
461 ParsedAttr &attr, QualType type) {
462 Declarator &declarator = state.getDeclarator();
464 // Move it to the outermost normal or block pointer declarator.
465 for (unsigned i = state.getCurrentChunkIndex(); i != 0; --i) {
466 DeclaratorChunk &chunk = declarator.getTypeObject(i-1);
467 switch (chunk.Kind) {
468 case DeclaratorChunk::Pointer:
469 case DeclaratorChunk::BlockPointer: {
470 // But don't move an ARC ownership attribute to the return type
472 DeclaratorChunk *destChunk = nullptr;
473 if (state.isProcessingDeclSpec() &&
474 attr.getKind() == ParsedAttr::AT_ObjCOwnership)
475 destChunk = maybeMovePastReturnType(declarator, i - 1,
476 /*onlyBlockPointers=*/true);
477 if (!destChunk) destChunk = &chunk;
479 moveAttrFromListToList(attr, state.getCurrentAttributes(),
480 destChunk->getAttrs());
484 case DeclaratorChunk::Paren:
485 case DeclaratorChunk::Array:
488 // We may be starting at the return type of a block.
489 case DeclaratorChunk::Function:
490 if (state.isProcessingDeclSpec() &&
491 attr.getKind() == ParsedAttr::AT_ObjCOwnership) {
492 if (DeclaratorChunk *dest = maybeMovePastReturnType(
494 /*onlyBlockPointers=*/true)) {
495 moveAttrFromListToList(attr, state.getCurrentAttributes(),
502 // Don't walk through these.
503 case DeclaratorChunk::Reference:
504 case DeclaratorChunk::MemberPointer:
505 case DeclaratorChunk::Pipe:
511 diagnoseBadTypeAttribute(state.getSema(), attr, type);
514 /// Distribute an objc_gc type attribute that was written on the
516 static void distributeObjCPointerTypeAttrFromDeclarator(
517 TypeProcessingState &state, ParsedAttr &attr, QualType &declSpecType) {
518 Declarator &declarator = state.getDeclarator();
520 // objc_gc goes on the innermost pointer to something that's not a
522 unsigned innermost = -1U;
523 bool considerDeclSpec = true;
524 for (unsigned i = 0, e = declarator.getNumTypeObjects(); i != e; ++i) {
525 DeclaratorChunk &chunk = declarator.getTypeObject(i);
526 switch (chunk.Kind) {
527 case DeclaratorChunk::Pointer:
528 case DeclaratorChunk::BlockPointer:
532 case DeclaratorChunk::Reference:
533 case DeclaratorChunk::MemberPointer:
534 case DeclaratorChunk::Paren:
535 case DeclaratorChunk::Array:
536 case DeclaratorChunk::Pipe:
539 case DeclaratorChunk::Function:
540 considerDeclSpec = false;
546 // That might actually be the decl spec if we weren't blocked by
547 // anything in the declarator.
548 if (considerDeclSpec) {
549 if (handleObjCPointerTypeAttr(state, attr, declSpecType)) {
550 // Splice the attribute into the decl spec. Prevents the
551 // attribute from being applied multiple times and gives
552 // the source-location-filler something to work with.
553 state.saveDeclSpecAttrs();
554 declarator.getMutableDeclSpec().getAttributes().takeOneFrom(
555 declarator.getAttributes(), &attr);
560 // Otherwise, if we found an appropriate chunk, splice the attribute
562 if (innermost != -1U) {
563 moveAttrFromListToList(attr, declarator.getAttributes(),
564 declarator.getTypeObject(innermost).getAttrs());
568 // Otherwise, diagnose when we're done building the type.
569 declarator.getAttributes().remove(&attr);
570 state.addIgnoredTypeAttr(attr);
573 /// A function type attribute was written somewhere in a declaration
574 /// *other* than on the declarator itself or in the decl spec. Given
575 /// that it didn't apply in whatever position it was written in, try
576 /// to move it to a more appropriate position.
577 static void distributeFunctionTypeAttr(TypeProcessingState &state,
578 ParsedAttr &attr, QualType type) {
579 Declarator &declarator = state.getDeclarator();
581 // Try to push the attribute from the return type of a function to
582 // the function itself.
583 for (unsigned i = state.getCurrentChunkIndex(); i != 0; --i) {
584 DeclaratorChunk &chunk = declarator.getTypeObject(i-1);
585 switch (chunk.Kind) {
586 case DeclaratorChunk::Function:
587 moveAttrFromListToList(attr, state.getCurrentAttributes(),
591 case DeclaratorChunk::Paren:
592 case DeclaratorChunk::Pointer:
593 case DeclaratorChunk::BlockPointer:
594 case DeclaratorChunk::Array:
595 case DeclaratorChunk::Reference:
596 case DeclaratorChunk::MemberPointer:
597 case DeclaratorChunk::Pipe:
602 diagnoseBadTypeAttribute(state.getSema(), attr, type);
605 /// Try to distribute a function type attribute to the innermost
606 /// function chunk or type. Returns true if the attribute was
607 /// distributed, false if no location was found.
608 static bool distributeFunctionTypeAttrToInnermost(
609 TypeProcessingState &state, ParsedAttr &attr,
610 ParsedAttributesView &attrList, QualType &declSpecType) {
611 Declarator &declarator = state.getDeclarator();
613 // Put it on the innermost function chunk, if there is one.
614 for (unsigned i = 0, e = declarator.getNumTypeObjects(); i != e; ++i) {
615 DeclaratorChunk &chunk = declarator.getTypeObject(i);
616 if (chunk.Kind != DeclaratorChunk::Function) continue;
618 moveAttrFromListToList(attr, attrList, chunk.getAttrs());
622 return handleFunctionTypeAttr(state, attr, declSpecType);
625 /// A function type attribute was written in the decl spec. Try to
626 /// apply it somewhere.
627 static void distributeFunctionTypeAttrFromDeclSpec(TypeProcessingState &state,
629 QualType &declSpecType) {
630 state.saveDeclSpecAttrs();
632 // Try to distribute to the innermost.
633 if (distributeFunctionTypeAttrToInnermost(
634 state, attr, state.getCurrentAttributes(), declSpecType))
637 // If that failed, diagnose the bad attribute when the declarator is
639 state.addIgnoredTypeAttr(attr);
642 /// A function type attribute was written on the declarator or declaration.
643 /// Try to apply it somewhere.
644 /// `Attrs` is the attribute list containing the declaration (either of the
645 /// declarator or the declaration).
646 static void distributeFunctionTypeAttrFromDeclarator(TypeProcessingState &state,
648 QualType &declSpecType) {
649 Declarator &declarator = state.getDeclarator();
651 // Try to distribute to the innermost.
652 if (distributeFunctionTypeAttrToInnermost(
653 state, attr, declarator.getAttributes(), declSpecType))
656 // If that failed, diagnose the bad attribute when the declarator is
658 declarator.getAttributes().remove(&attr);
659 state.addIgnoredTypeAttr(attr);
662 /// Given that there are attributes written on the declarator or declaration
663 /// itself, try to distribute any type attributes to the appropriate
664 /// declarator chunk.
666 /// These are attributes like the following:
669 /// but not necessarily this:
672 /// `Attrs` is the attribute list containing the declaration (either of the
673 /// declarator or the declaration).
674 static void distributeTypeAttrsFromDeclarator(TypeProcessingState &state,
675 QualType &declSpecType) {
676 // The called functions in this loop actually remove things from the current
677 // list, so iterating over the existing list isn't possible. Instead, make a
678 // non-owning copy and iterate over that.
679 ParsedAttributesView AttrsCopy{state.getDeclarator().getAttributes()};
680 for (ParsedAttr &attr : AttrsCopy) {
681 // Do not distribute [[]] attributes. They have strict rules for what
682 // they appertain to.
683 if (attr.isStandardAttributeSyntax())
686 switch (attr.getKind()) {
687 OBJC_POINTER_TYPE_ATTRS_CASELIST:
688 distributeObjCPointerTypeAttrFromDeclarator(state, attr, declSpecType);
691 FUNCTION_TYPE_ATTRS_CASELIST:
692 distributeFunctionTypeAttrFromDeclarator(state, attr, declSpecType);
695 MS_TYPE_ATTRS_CASELIST:
696 // Microsoft type attributes cannot go after the declarator-id.
699 NULLABILITY_TYPE_ATTRS_CASELIST:
700 // Nullability specifiers cannot go after the declarator-id.
702 // Objective-C __kindof does not get distributed.
703 case ParsedAttr::AT_ObjCKindOf:
712 /// Add a synthetic '()' to a block-literal declarator if it is
713 /// required, given the return type.
714 static void maybeSynthesizeBlockSignature(TypeProcessingState &state,
715 QualType declSpecType) {
716 Declarator &declarator = state.getDeclarator();
718 // First, check whether the declarator would produce a function,
719 // i.e. whether the innermost semantic chunk is a function.
720 if (declarator.isFunctionDeclarator()) {
721 // If so, make that declarator a prototyped declarator.
722 declarator.getFunctionTypeInfo().hasPrototype = true;
726 // If there are any type objects, the type as written won't name a
727 // function, regardless of the decl spec type. This is because a
728 // block signature declarator is always an abstract-declarator, and
729 // abstract-declarators can't just be parentheses chunks. Therefore
730 // we need to build a function chunk unless there are no type
731 // objects and the decl spec type is a function.
732 if (!declarator.getNumTypeObjects() && declSpecType->isFunctionType())
735 // Note that there *are* cases with invalid declarators where
736 // declarators consist solely of parentheses. In general, these
737 // occur only in failed efforts to make function declarators, so
738 // faking up the function chunk is still the right thing to do.
740 // Otherwise, we need to fake up a function declarator.
741 SourceLocation loc = declarator.getBeginLoc();
743 // ...and *prepend* it to the declarator.
744 SourceLocation NoLoc;
745 declarator.AddInnermostTypeInfo(DeclaratorChunk::getFunction(
747 /*IsAmbiguous=*/false,
751 /*EllipsisLoc=*/NoLoc,
753 /*RefQualifierIsLvalueRef=*/true,
754 /*RefQualifierLoc=*/NoLoc,
755 /*MutableLoc=*/NoLoc, EST_None,
756 /*ESpecRange=*/SourceRange(),
757 /*Exceptions=*/nullptr,
758 /*ExceptionRanges=*/nullptr,
760 /*NoexceptExpr=*/nullptr,
761 /*ExceptionSpecTokens=*/nullptr,
762 /*DeclsInPrototype=*/None, loc, loc, declarator));
764 // For consistency, make sure the state still has us as processing
766 assert(state.getCurrentChunkIndex() == declarator.getNumTypeObjects() - 1);
767 state.setCurrentChunkIndex(declarator.getNumTypeObjects());
770 static void diagnoseAndRemoveTypeQualifiers(Sema &S, const DeclSpec &DS,
775 // If this occurs outside a template instantiation, warn the user about
776 // it; they probably didn't mean to specify a redundant qualifier.
777 typedef std::pair<DeclSpec::TQ, SourceLocation> QualLoc;
778 for (QualLoc Qual : {QualLoc(DeclSpec::TQ_const, DS.getConstSpecLoc()),
779 QualLoc(DeclSpec::TQ_restrict, DS.getRestrictSpecLoc()),
780 QualLoc(DeclSpec::TQ_volatile, DS.getVolatileSpecLoc()),
781 QualLoc(DeclSpec::TQ_atomic, DS.getAtomicSpecLoc())}) {
782 if (!(RemoveTQs & Qual.first))
785 if (!S.inTemplateInstantiation()) {
786 if (TypeQuals & Qual.first)
787 S.Diag(Qual.second, DiagID)
788 << DeclSpec::getSpecifierName(Qual.first) << TypeSoFar
789 << FixItHint::CreateRemoval(Qual.second);
792 TypeQuals &= ~Qual.first;
796 /// Return true if this is omitted block return type. Also check type
797 /// attributes and type qualifiers when returning true.
798 static bool checkOmittedBlockReturnType(Sema &S, Declarator &declarator,
800 if (!isOmittedBlockReturnType(declarator))
803 // Warn if we see type attributes for omitted return type on a block literal.
804 SmallVector<ParsedAttr *, 2> ToBeRemoved;
805 for (ParsedAttr &AL : declarator.getMutableDeclSpec().getAttributes()) {
806 if (AL.isInvalid() || !AL.isTypeAttr())
809 diag::warn_block_literal_attributes_on_omitted_return_type)
811 ToBeRemoved.push_back(&AL);
813 // Remove bad attributes from the list.
814 for (ParsedAttr *AL : ToBeRemoved)
815 declarator.getMutableDeclSpec().getAttributes().remove(AL);
817 // Warn if we see type qualifiers for omitted return type on a block literal.
818 const DeclSpec &DS = declarator.getDeclSpec();
819 unsigned TypeQuals = DS.getTypeQualifiers();
820 diagnoseAndRemoveTypeQualifiers(S, DS, TypeQuals, Result, (unsigned)-1,
821 diag::warn_block_literal_qualifiers_on_omitted_return_type);
822 declarator.getMutableDeclSpec().ClearTypeQualifiers();
827 /// Apply Objective-C type arguments to the given type.
828 static QualType applyObjCTypeArgs(Sema &S, SourceLocation loc, QualType type,
829 ArrayRef<TypeSourceInfo *> typeArgs,
830 SourceRange typeArgsRange,
831 bool failOnError = false) {
832 // We can only apply type arguments to an Objective-C class type.
833 const auto *objcObjectType = type->getAs<ObjCObjectType>();
834 if (!objcObjectType || !objcObjectType->getInterface()) {
835 S.Diag(loc, diag::err_objc_type_args_non_class)
844 // The class type must be parameterized.
845 ObjCInterfaceDecl *objcClass = objcObjectType->getInterface();
846 ObjCTypeParamList *typeParams = objcClass->getTypeParamList();
848 S.Diag(loc, diag::err_objc_type_args_non_parameterized_class)
849 << objcClass->getDeclName()
850 << FixItHint::CreateRemoval(typeArgsRange);
858 // The type must not already be specialized.
859 if (objcObjectType->isSpecialized()) {
860 S.Diag(loc, diag::err_objc_type_args_specialized_class)
862 << FixItHint::CreateRemoval(typeArgsRange);
870 // Check the type arguments.
871 SmallVector<QualType, 4> finalTypeArgs;
872 unsigned numTypeParams = typeParams->size();
873 bool anyPackExpansions = false;
874 for (unsigned i = 0, n = typeArgs.size(); i != n; ++i) {
875 TypeSourceInfo *typeArgInfo = typeArgs[i];
876 QualType typeArg = typeArgInfo->getType();
878 // Type arguments cannot have explicit qualifiers or nullability.
879 // We ignore indirect sources of these, e.g. behind typedefs or
880 // template arguments.
881 if (TypeLoc qual = typeArgInfo->getTypeLoc().findExplicitQualifierLoc()) {
882 bool diagnosed = false;
883 SourceRange rangeToRemove;
884 if (auto attr = qual.getAs<AttributedTypeLoc>()) {
885 rangeToRemove = attr.getLocalSourceRange();
886 if (attr.getTypePtr()->getImmediateNullability()) {
887 typeArg = attr.getTypePtr()->getModifiedType();
888 S.Diag(attr.getBeginLoc(),
889 diag::err_objc_type_arg_explicit_nullability)
890 << typeArg << FixItHint::CreateRemoval(rangeToRemove);
896 S.Diag(qual.getBeginLoc(), diag::err_objc_type_arg_qualified)
897 << typeArg << typeArg.getQualifiers().getAsString()
898 << FixItHint::CreateRemoval(rangeToRemove);
902 // Remove qualifiers even if they're non-local.
903 typeArg = typeArg.getUnqualifiedType();
905 finalTypeArgs.push_back(typeArg);
907 if (typeArg->getAs<PackExpansionType>())
908 anyPackExpansions = true;
910 // Find the corresponding type parameter, if there is one.
911 ObjCTypeParamDecl *typeParam = nullptr;
912 if (!anyPackExpansions) {
913 if (i < numTypeParams) {
914 typeParam = typeParams->begin()[i];
916 // Too many arguments.
917 S.Diag(loc, diag::err_objc_type_args_wrong_arity)
919 << objcClass->getDeclName()
920 << (unsigned)typeArgs.size()
922 S.Diag(objcClass->getLocation(), diag::note_previous_decl)
932 // Objective-C object pointer types must be substitutable for the bounds.
933 if (const auto *typeArgObjC = typeArg->getAs<ObjCObjectPointerType>()) {
934 // If we don't have a type parameter to match against, assume
935 // everything is fine. There was a prior pack expansion that
936 // means we won't be able to match anything.
938 assert(anyPackExpansions && "Too many arguments?");
942 // Retrieve the bound.
943 QualType bound = typeParam->getUnderlyingType();
944 const auto *boundObjC = bound->getAs<ObjCObjectPointerType>();
946 // Determine whether the type argument is substitutable for the bound.
947 if (typeArgObjC->isObjCIdType()) {
948 // When the type argument is 'id', the only acceptable type
949 // parameter bound is 'id'.
950 if (boundObjC->isObjCIdType())
952 } else if (S.Context.canAssignObjCInterfaces(boundObjC, typeArgObjC)) {
953 // Otherwise, we follow the assignability rules.
957 // Diagnose the mismatch.
958 S.Diag(typeArgInfo->getTypeLoc().getBeginLoc(),
959 diag::err_objc_type_arg_does_not_match_bound)
960 << typeArg << bound << typeParam->getDeclName();
961 S.Diag(typeParam->getLocation(), diag::note_objc_type_param_here)
962 << typeParam->getDeclName();
970 // Block pointer types are permitted for unqualified 'id' bounds.
971 if (typeArg->isBlockPointerType()) {
972 // If we don't have a type parameter to match against, assume
973 // everything is fine. There was a prior pack expansion that
974 // means we won't be able to match anything.
976 assert(anyPackExpansions && "Too many arguments?");
980 // Retrieve the bound.
981 QualType bound = typeParam->getUnderlyingType();
982 if (bound->isBlockCompatibleObjCPointerType(S.Context))
985 // Diagnose the mismatch.
986 S.Diag(typeArgInfo->getTypeLoc().getBeginLoc(),
987 diag::err_objc_type_arg_does_not_match_bound)
988 << typeArg << bound << typeParam->getDeclName();
989 S.Diag(typeParam->getLocation(), diag::note_objc_type_param_here)
990 << typeParam->getDeclName();
998 // Dependent types will be checked at instantiation time.
999 if (typeArg->isDependentType()) {
1003 // Diagnose non-id-compatible type arguments.
1004 S.Diag(typeArgInfo->getTypeLoc().getBeginLoc(),
1005 diag::err_objc_type_arg_not_id_compatible)
1006 << typeArg << typeArgInfo->getTypeLoc().getSourceRange();
1014 // Make sure we didn't have the wrong number of arguments.
1015 if (!anyPackExpansions && finalTypeArgs.size() != numTypeParams) {
1016 S.Diag(loc, diag::err_objc_type_args_wrong_arity)
1017 << (typeArgs.size() < typeParams->size())
1018 << objcClass->getDeclName()
1019 << (unsigned)finalTypeArgs.size()
1020 << (unsigned)numTypeParams;
1021 S.Diag(objcClass->getLocation(), diag::note_previous_decl)
1030 // Success. Form the specialized type.
1031 return S.Context.getObjCObjectType(type, finalTypeArgs, { }, false);
1034 QualType Sema::BuildObjCTypeParamType(const ObjCTypeParamDecl *Decl,
1035 SourceLocation ProtocolLAngleLoc,
1036 ArrayRef<ObjCProtocolDecl *> Protocols,
1037 ArrayRef<SourceLocation> ProtocolLocs,
1038 SourceLocation ProtocolRAngleLoc,
1040 QualType Result = QualType(Decl->getTypeForDecl(), 0);
1041 if (!Protocols.empty()) {
1043 Result = Context.applyObjCProtocolQualifiers(Result, Protocols,
1046 Diag(SourceLocation(), diag::err_invalid_protocol_qualifiers)
1047 << SourceRange(ProtocolLAngleLoc, ProtocolRAngleLoc);
1048 if (FailOnError) Result = QualType();
1050 if (FailOnError && Result.isNull())
1057 QualType Sema::BuildObjCObjectType(QualType BaseType,
1059 SourceLocation TypeArgsLAngleLoc,
1060 ArrayRef<TypeSourceInfo *> TypeArgs,
1061 SourceLocation TypeArgsRAngleLoc,
1062 SourceLocation ProtocolLAngleLoc,
1063 ArrayRef<ObjCProtocolDecl *> Protocols,
1064 ArrayRef<SourceLocation> ProtocolLocs,
1065 SourceLocation ProtocolRAngleLoc,
1067 QualType Result = BaseType;
1068 if (!TypeArgs.empty()) {
1069 Result = applyObjCTypeArgs(*this, Loc, Result, TypeArgs,
1070 SourceRange(TypeArgsLAngleLoc,
1073 if (FailOnError && Result.isNull())
1077 if (!Protocols.empty()) {
1079 Result = Context.applyObjCProtocolQualifiers(Result, Protocols,
1082 Diag(Loc, diag::err_invalid_protocol_qualifiers)
1083 << SourceRange(ProtocolLAngleLoc, ProtocolRAngleLoc);
1084 if (FailOnError) Result = QualType();
1086 if (FailOnError && Result.isNull())
1093 TypeResult Sema::actOnObjCProtocolQualifierType(
1094 SourceLocation lAngleLoc,
1095 ArrayRef<Decl *> protocols,
1096 ArrayRef<SourceLocation> protocolLocs,
1097 SourceLocation rAngleLoc) {
1098 // Form id<protocol-list>.
1099 QualType Result = Context.getObjCObjectType(
1100 Context.ObjCBuiltinIdTy, { },
1102 (ObjCProtocolDecl * const *)protocols.data(),
1105 Result = Context.getObjCObjectPointerType(Result);
1107 TypeSourceInfo *ResultTInfo = Context.CreateTypeSourceInfo(Result);
1108 TypeLoc ResultTL = ResultTInfo->getTypeLoc();
1110 auto ObjCObjectPointerTL = ResultTL.castAs<ObjCObjectPointerTypeLoc>();
1111 ObjCObjectPointerTL.setStarLoc(SourceLocation()); // implicit
1113 auto ObjCObjectTL = ObjCObjectPointerTL.getPointeeLoc()
1114 .castAs<ObjCObjectTypeLoc>();
1115 ObjCObjectTL.setHasBaseTypeAsWritten(false);
1116 ObjCObjectTL.getBaseLoc().initialize(Context, SourceLocation());
1118 // No type arguments.
1119 ObjCObjectTL.setTypeArgsLAngleLoc(SourceLocation());
1120 ObjCObjectTL.setTypeArgsRAngleLoc(SourceLocation());
1122 // Fill in protocol qualifiers.
1123 ObjCObjectTL.setProtocolLAngleLoc(lAngleLoc);
1124 ObjCObjectTL.setProtocolRAngleLoc(rAngleLoc);
1125 for (unsigned i = 0, n = protocols.size(); i != n; ++i)
1126 ObjCObjectTL.setProtocolLoc(i, protocolLocs[i]);
1128 // We're done. Return the completed type to the parser.
1129 return CreateParsedType(Result, ResultTInfo);
1132 TypeResult Sema::actOnObjCTypeArgsAndProtocolQualifiers(
1135 ParsedType BaseType,
1136 SourceLocation TypeArgsLAngleLoc,
1137 ArrayRef<ParsedType> TypeArgs,
1138 SourceLocation TypeArgsRAngleLoc,
1139 SourceLocation ProtocolLAngleLoc,
1140 ArrayRef<Decl *> Protocols,
1141 ArrayRef<SourceLocation> ProtocolLocs,
1142 SourceLocation ProtocolRAngleLoc) {
1143 TypeSourceInfo *BaseTypeInfo = nullptr;
1144 QualType T = GetTypeFromParser(BaseType, &BaseTypeInfo);
1148 // Handle missing type-source info.
1150 BaseTypeInfo = Context.getTrivialTypeSourceInfo(T, Loc);
1152 // Extract type arguments.
1153 SmallVector<TypeSourceInfo *, 4> ActualTypeArgInfos;
1154 for (unsigned i = 0, n = TypeArgs.size(); i != n; ++i) {
1155 TypeSourceInfo *TypeArgInfo = nullptr;
1156 QualType TypeArg = GetTypeFromParser(TypeArgs[i], &TypeArgInfo);
1157 if (TypeArg.isNull()) {
1158 ActualTypeArgInfos.clear();
1162 assert(TypeArgInfo && "No type source info?");
1163 ActualTypeArgInfos.push_back(TypeArgInfo);
1166 // Build the object type.
1167 QualType Result = BuildObjCObjectType(
1168 T, BaseTypeInfo->getTypeLoc().getSourceRange().getBegin(),
1169 TypeArgsLAngleLoc, ActualTypeArgInfos, TypeArgsRAngleLoc,
1171 llvm::makeArrayRef((ObjCProtocolDecl * const *)Protocols.data(),
1173 ProtocolLocs, ProtocolRAngleLoc,
1174 /*FailOnError=*/false);
1179 // Create source information for this type.
1180 TypeSourceInfo *ResultTInfo = Context.CreateTypeSourceInfo(Result);
1181 TypeLoc ResultTL = ResultTInfo->getTypeLoc();
1183 // For id<Proto1, Proto2> or Class<Proto1, Proto2>, we'll have an
1184 // object pointer type. Fill in source information for it.
1185 if (auto ObjCObjectPointerTL = ResultTL.getAs<ObjCObjectPointerTypeLoc>()) {
1186 // The '*' is implicit.
1187 ObjCObjectPointerTL.setStarLoc(SourceLocation());
1188 ResultTL = ObjCObjectPointerTL.getPointeeLoc();
1191 if (auto OTPTL = ResultTL.getAs<ObjCTypeParamTypeLoc>()) {
1192 // Protocol qualifier information.
1193 if (OTPTL.getNumProtocols() > 0) {
1194 assert(OTPTL.getNumProtocols() == Protocols.size());
1195 OTPTL.setProtocolLAngleLoc(ProtocolLAngleLoc);
1196 OTPTL.setProtocolRAngleLoc(ProtocolRAngleLoc);
1197 for (unsigned i = 0, n = Protocols.size(); i != n; ++i)
1198 OTPTL.setProtocolLoc(i, ProtocolLocs[i]);
1201 // We're done. Return the completed type to the parser.
1202 return CreateParsedType(Result, ResultTInfo);
1205 auto ObjCObjectTL = ResultTL.castAs<ObjCObjectTypeLoc>();
1207 // Type argument information.
1208 if (ObjCObjectTL.getNumTypeArgs() > 0) {
1209 assert(ObjCObjectTL.getNumTypeArgs() == ActualTypeArgInfos.size());
1210 ObjCObjectTL.setTypeArgsLAngleLoc(TypeArgsLAngleLoc);
1211 ObjCObjectTL.setTypeArgsRAngleLoc(TypeArgsRAngleLoc);
1212 for (unsigned i = 0, n = ActualTypeArgInfos.size(); i != n; ++i)
1213 ObjCObjectTL.setTypeArgTInfo(i, ActualTypeArgInfos[i]);
1215 ObjCObjectTL.setTypeArgsLAngleLoc(SourceLocation());
1216 ObjCObjectTL.setTypeArgsRAngleLoc(SourceLocation());
1219 // Protocol qualifier information.
1220 if (ObjCObjectTL.getNumProtocols() > 0) {
1221 assert(ObjCObjectTL.getNumProtocols() == Protocols.size());
1222 ObjCObjectTL.setProtocolLAngleLoc(ProtocolLAngleLoc);
1223 ObjCObjectTL.setProtocolRAngleLoc(ProtocolRAngleLoc);
1224 for (unsigned i = 0, n = Protocols.size(); i != n; ++i)
1225 ObjCObjectTL.setProtocolLoc(i, ProtocolLocs[i]);
1227 ObjCObjectTL.setProtocolLAngleLoc(SourceLocation());
1228 ObjCObjectTL.setProtocolRAngleLoc(SourceLocation());
1232 ObjCObjectTL.setHasBaseTypeAsWritten(true);
1233 if (ObjCObjectTL.getType() == T)
1234 ObjCObjectTL.getBaseLoc().initializeFullCopy(BaseTypeInfo->getTypeLoc());
1236 ObjCObjectTL.getBaseLoc().initialize(Context, Loc);
1238 // We're done. Return the completed type to the parser.
1239 return CreateParsedType(Result, ResultTInfo);
1242 static OpenCLAccessAttr::Spelling
1243 getImageAccess(const ParsedAttributesView &Attrs) {
1244 for (const ParsedAttr &AL : Attrs)
1245 if (AL.getKind() == ParsedAttr::AT_OpenCLAccess)
1246 return static_cast<OpenCLAccessAttr::Spelling>(AL.getSemanticSpelling());
1247 return OpenCLAccessAttr::Keyword_read_only;
1250 /// Convert the specified declspec to the appropriate type
1252 /// \param state Specifies the declarator containing the declaration specifier
1253 /// to be converted, along with other associated processing state.
1254 /// \returns The type described by the declaration specifiers. This function
1255 /// never returns null.
1256 static QualType ConvertDeclSpecToType(TypeProcessingState &state) {
1257 // FIXME: Should move the logic from DeclSpec::Finish to here for validity
1260 Sema &S = state.getSema();
1261 Declarator &declarator = state.getDeclarator();
1262 DeclSpec &DS = declarator.getMutableDeclSpec();
1263 SourceLocation DeclLoc = declarator.getIdentifierLoc();
1264 if (DeclLoc.isInvalid())
1265 DeclLoc = DS.getBeginLoc();
1267 ASTContext &Context = S.Context;
1270 switch (DS.getTypeSpecType()) {
1271 case DeclSpec::TST_void:
1272 Result = Context.VoidTy;
1274 case DeclSpec::TST_char:
1275 if (DS.getTypeSpecSign() == TypeSpecifierSign::Unspecified)
1276 Result = Context.CharTy;
1277 else if (DS.getTypeSpecSign() == TypeSpecifierSign::Signed)
1278 Result = Context.SignedCharTy;
1280 assert(DS.getTypeSpecSign() == TypeSpecifierSign::Unsigned &&
1281 "Unknown TSS value");
1282 Result = Context.UnsignedCharTy;
1285 case DeclSpec::TST_wchar:
1286 if (DS.getTypeSpecSign() == TypeSpecifierSign::Unspecified)
1287 Result = Context.WCharTy;
1288 else if (DS.getTypeSpecSign() == TypeSpecifierSign::Signed) {
1289 S.Diag(DS.getTypeSpecSignLoc(), diag::ext_wchar_t_sign_spec)
1290 << DS.getSpecifierName(DS.getTypeSpecType(),
1291 Context.getPrintingPolicy());
1292 Result = Context.getSignedWCharType();
1294 assert(DS.getTypeSpecSign() == TypeSpecifierSign::Unsigned &&
1295 "Unknown TSS value");
1296 S.Diag(DS.getTypeSpecSignLoc(), diag::ext_wchar_t_sign_spec)
1297 << DS.getSpecifierName(DS.getTypeSpecType(),
1298 Context.getPrintingPolicy());
1299 Result = Context.getUnsignedWCharType();
1302 case DeclSpec::TST_char8:
1303 assert(DS.getTypeSpecSign() == TypeSpecifierSign::Unspecified &&
1304 "Unknown TSS value");
1305 Result = Context.Char8Ty;
1307 case DeclSpec::TST_char16:
1308 assert(DS.getTypeSpecSign() == TypeSpecifierSign::Unspecified &&
1309 "Unknown TSS value");
1310 Result = Context.Char16Ty;
1312 case DeclSpec::TST_char32:
1313 assert(DS.getTypeSpecSign() == TypeSpecifierSign::Unspecified &&
1314 "Unknown TSS value");
1315 Result = Context.Char32Ty;
1317 case DeclSpec::TST_unspecified:
1318 // If this is a missing declspec in a block literal return context, then it
1319 // is inferred from the return statements inside the block.
1320 // The declspec is always missing in a lambda expr context; it is either
1321 // specified with a trailing return type or inferred.
1322 if (S.getLangOpts().CPlusPlus14 &&
1323 declarator.getContext() == DeclaratorContext::LambdaExpr) {
1324 // In C++1y, a lambda's implicit return type is 'auto'.
1325 Result = Context.getAutoDeductType();
1327 } else if (declarator.getContext() == DeclaratorContext::LambdaExpr ||
1328 checkOmittedBlockReturnType(S, declarator,
1329 Context.DependentTy)) {
1330 Result = Context.DependentTy;
1334 // Unspecified typespec defaults to int in C90. However, the C90 grammar
1335 // [C90 6.5] only allows a decl-spec if there was *some* type-specifier,
1336 // type-qualifier, or storage-class-specifier. If not, emit an extwarn.
1337 // Note that the one exception to this is function definitions, which are
1338 // allowed to be completely missing a declspec. This is handled in the
1339 // parser already though by it pretending to have seen an 'int' in this
1341 if (S.getLangOpts().isImplicitIntRequired()) {
1342 S.Diag(DeclLoc, diag::warn_missing_type_specifier)
1343 << DS.getSourceRange()
1344 << FixItHint::CreateInsertion(DS.getBeginLoc(), "int");
1345 } else if (!DS.hasTypeSpecifier()) {
1346 // C99 and C++ require a type specifier. For example, C99 6.7.2p2 says:
1347 // "At least one type specifier shall be given in the declaration
1348 // specifiers in each declaration, and in the specifier-qualifier list in
1349 // each struct declaration and type name."
1350 if (!S.getLangOpts().isImplicitIntAllowed() && !DS.isTypeSpecPipe()) {
1351 S.Diag(DeclLoc, diag::err_missing_type_specifier)
1352 << DS.getSourceRange();
1354 // When this occurs, often something is very broken with the value
1355 // being declared, poison it as invalid so we don't get chains of
1357 declarator.setInvalidType(true);
1358 } else if (S.getLangOpts().getOpenCLCompatibleVersion() >= 200 &&
1359 DS.isTypeSpecPipe()) {
1360 S.Diag(DeclLoc, diag::err_missing_actual_pipe_type)
1361 << DS.getSourceRange();
1362 declarator.setInvalidType(true);
1364 assert(S.getLangOpts().isImplicitIntAllowed() &&
1365 "implicit int is disabled?");
1366 S.Diag(DeclLoc, diag::ext_missing_type_specifier)
1367 << DS.getSourceRange()
1368 << FixItHint::CreateInsertion(DS.getBeginLoc(), "int");
1373 case DeclSpec::TST_int: {
1374 if (DS.getTypeSpecSign() != TypeSpecifierSign::Unsigned) {
1375 switch (DS.getTypeSpecWidth()) {
1376 case TypeSpecifierWidth::Unspecified:
1377 Result = Context.IntTy;
1379 case TypeSpecifierWidth::Short:
1380 Result = Context.ShortTy;
1382 case TypeSpecifierWidth::Long:
1383 Result = Context.LongTy;
1385 case TypeSpecifierWidth::LongLong:
1386 Result = Context.LongLongTy;
1388 // 'long long' is a C99 or C++11 feature.
1389 if (!S.getLangOpts().C99) {
1390 if (S.getLangOpts().CPlusPlus)
1391 S.Diag(DS.getTypeSpecWidthLoc(),
1392 S.getLangOpts().CPlusPlus11 ?
1393 diag::warn_cxx98_compat_longlong : diag::ext_cxx11_longlong);
1395 S.Diag(DS.getTypeSpecWidthLoc(), diag::ext_c99_longlong);
1400 switch (DS.getTypeSpecWidth()) {
1401 case TypeSpecifierWidth::Unspecified:
1402 Result = Context.UnsignedIntTy;
1404 case TypeSpecifierWidth::Short:
1405 Result = Context.UnsignedShortTy;
1407 case TypeSpecifierWidth::Long:
1408 Result = Context.UnsignedLongTy;
1410 case TypeSpecifierWidth::LongLong:
1411 Result = Context.UnsignedLongLongTy;
1413 // 'long long' is a C99 or C++11 feature.
1414 if (!S.getLangOpts().C99) {
1415 if (S.getLangOpts().CPlusPlus)
1416 S.Diag(DS.getTypeSpecWidthLoc(),
1417 S.getLangOpts().CPlusPlus11 ?
1418 diag::warn_cxx98_compat_longlong : diag::ext_cxx11_longlong);
1420 S.Diag(DS.getTypeSpecWidthLoc(), diag::ext_c99_longlong);
1427 case DeclSpec::TST_bitint: {
1428 if (!S.Context.getTargetInfo().hasBitIntType())
1429 S.Diag(DS.getTypeSpecTypeLoc(), diag::err_type_unsupported) << "_BitInt";
1431 S.BuildBitIntType(DS.getTypeSpecSign() == TypeSpecifierSign::Unsigned,
1432 DS.getRepAsExpr(), DS.getBeginLoc());
1433 if (Result.isNull()) {
1434 Result = Context.IntTy;
1435 declarator.setInvalidType(true);
1439 case DeclSpec::TST_accum: {
1440 switch (DS.getTypeSpecWidth()) {
1441 case TypeSpecifierWidth::Short:
1442 Result = Context.ShortAccumTy;
1444 case TypeSpecifierWidth::Unspecified:
1445 Result = Context.AccumTy;
1447 case TypeSpecifierWidth::Long:
1448 Result = Context.LongAccumTy;
1450 case TypeSpecifierWidth::LongLong:
1451 llvm_unreachable("Unable to specify long long as _Accum width");
1454 if (DS.getTypeSpecSign() == TypeSpecifierSign::Unsigned)
1455 Result = Context.getCorrespondingUnsignedType(Result);
1457 if (DS.isTypeSpecSat())
1458 Result = Context.getCorrespondingSaturatedType(Result);
1462 case DeclSpec::TST_fract: {
1463 switch (DS.getTypeSpecWidth()) {
1464 case TypeSpecifierWidth::Short:
1465 Result = Context.ShortFractTy;
1467 case TypeSpecifierWidth::Unspecified:
1468 Result = Context.FractTy;
1470 case TypeSpecifierWidth::Long:
1471 Result = Context.LongFractTy;
1473 case TypeSpecifierWidth::LongLong:
1474 llvm_unreachable("Unable to specify long long as _Fract width");
1477 if (DS.getTypeSpecSign() == TypeSpecifierSign::Unsigned)
1478 Result = Context.getCorrespondingUnsignedType(Result);
1480 if (DS.isTypeSpecSat())
1481 Result = Context.getCorrespondingSaturatedType(Result);
1485 case DeclSpec::TST_int128:
1486 if (!S.Context.getTargetInfo().hasInt128Type() &&
1487 !(S.getLangOpts().SYCLIsDevice || S.getLangOpts().CUDAIsDevice ||
1488 (S.getLangOpts().OpenMP && S.getLangOpts().OpenMPIsDevice)))
1489 S.Diag(DS.getTypeSpecTypeLoc(), diag::err_type_unsupported)
1491 if (DS.getTypeSpecSign() == TypeSpecifierSign::Unsigned)
1492 Result = Context.UnsignedInt128Ty;
1494 Result = Context.Int128Ty;
1496 case DeclSpec::TST_float16:
1497 // CUDA host and device may have different _Float16 support, therefore
1498 // do not diagnose _Float16 usage to avoid false alarm.
1499 // ToDo: more precise diagnostics for CUDA.
1500 if (!S.Context.getTargetInfo().hasFloat16Type() && !S.getLangOpts().CUDA &&
1501 !(S.getLangOpts().OpenMP && S.getLangOpts().OpenMPIsDevice))
1502 S.Diag(DS.getTypeSpecTypeLoc(), diag::err_type_unsupported)
1504 Result = Context.Float16Ty;
1506 case DeclSpec::TST_half: Result = Context.HalfTy; break;
1507 case DeclSpec::TST_BFloat16:
1508 if (!S.Context.getTargetInfo().hasBFloat16Type())
1509 S.Diag(DS.getTypeSpecTypeLoc(), diag::err_type_unsupported)
1511 Result = Context.BFloat16Ty;
1513 case DeclSpec::TST_float: Result = Context.FloatTy; break;
1514 case DeclSpec::TST_double:
1515 if (DS.getTypeSpecWidth() == TypeSpecifierWidth::Long)
1516 Result = Context.LongDoubleTy;
1518 Result = Context.DoubleTy;
1519 if (S.getLangOpts().OpenCL) {
1520 if (!S.getOpenCLOptions().isSupported("cl_khr_fp64", S.getLangOpts()))
1521 S.Diag(DS.getTypeSpecTypeLoc(), diag::err_opencl_requires_extension)
1523 << (S.getLangOpts().getOpenCLCompatibleVersion() == 300
1524 ? "cl_khr_fp64 and __opencl_c_fp64"
1526 else if (!S.getOpenCLOptions().isAvailableOption("cl_khr_fp64", S.getLangOpts()))
1527 S.Diag(DS.getTypeSpecTypeLoc(), diag::ext_opencl_double_without_pragma);
1530 case DeclSpec::TST_float128:
1531 if (!S.Context.getTargetInfo().hasFloat128Type() &&
1532 !S.getLangOpts().SYCLIsDevice &&
1533 !(S.getLangOpts().OpenMP && S.getLangOpts().OpenMPIsDevice))
1534 S.Diag(DS.getTypeSpecTypeLoc(), diag::err_type_unsupported)
1536 Result = Context.Float128Ty;
1538 case DeclSpec::TST_ibm128:
1539 if (!S.Context.getTargetInfo().hasIbm128Type() &&
1540 !S.getLangOpts().SYCLIsDevice &&
1541 !(S.getLangOpts().OpenMP && S.getLangOpts().OpenMPIsDevice))
1542 S.Diag(DS.getTypeSpecTypeLoc(), diag::err_type_unsupported) << "__ibm128";
1543 Result = Context.Ibm128Ty;
1545 case DeclSpec::TST_bool:
1546 Result = Context.BoolTy; // _Bool or bool
1548 case DeclSpec::TST_decimal32: // _Decimal32
1549 case DeclSpec::TST_decimal64: // _Decimal64
1550 case DeclSpec::TST_decimal128: // _Decimal128
1551 S.Diag(DS.getTypeSpecTypeLoc(), diag::err_decimal_unsupported);
1552 Result = Context.IntTy;
1553 declarator.setInvalidType(true);
1555 case DeclSpec::TST_class:
1556 case DeclSpec::TST_enum:
1557 case DeclSpec::TST_union:
1558 case DeclSpec::TST_struct:
1559 case DeclSpec::TST_interface: {
1560 TagDecl *D = dyn_cast_or_null<TagDecl>(DS.getRepAsDecl());
1562 // This can happen in C++ with ambiguous lookups.
1563 Result = Context.IntTy;
1564 declarator.setInvalidType(true);
1568 // If the type is deprecated or unavailable, diagnose it.
1569 S.DiagnoseUseOfDecl(D, DS.getTypeSpecTypeNameLoc());
1571 assert(DS.getTypeSpecWidth() == TypeSpecifierWidth::Unspecified &&
1572 DS.getTypeSpecComplex() == 0 &&
1573 DS.getTypeSpecSign() == TypeSpecifierSign::Unspecified &&
1574 "No qualifiers on tag names!");
1576 // TypeQuals handled by caller.
1577 Result = Context.getTypeDeclType(D);
1579 // In both C and C++, make an ElaboratedType.
1580 ElaboratedTypeKeyword Keyword
1581 = ElaboratedType::getKeywordForTypeSpec(DS.getTypeSpecType());
1582 Result = S.getElaboratedType(Keyword, DS.getTypeSpecScope(), Result,
1583 DS.isTypeSpecOwned() ? D : nullptr);
1586 case DeclSpec::TST_typename: {
1587 assert(DS.getTypeSpecWidth() == TypeSpecifierWidth::Unspecified &&
1588 DS.getTypeSpecComplex() == 0 &&
1589 DS.getTypeSpecSign() == TypeSpecifierSign::Unspecified &&
1590 "Can't handle qualifiers on typedef names yet!");
1591 Result = S.GetTypeFromParser(DS.getRepAsType());
1592 if (Result.isNull()) {
1593 declarator.setInvalidType(true);
1596 // TypeQuals handled by caller.
1599 case DeclSpec::TST_typeofType:
1600 // FIXME: Preserve type source info.
1601 Result = S.GetTypeFromParser(DS.getRepAsType());
1602 assert(!Result.isNull() && "Didn't get a type for typeof?");
1603 if (!Result->isDependentType())
1604 if (const TagType *TT = Result->getAs<TagType>())
1605 S.DiagnoseUseOfDecl(TT->getDecl(), DS.getTypeSpecTypeLoc());
1606 // TypeQuals handled by caller.
1607 Result = Context.getTypeOfType(Result);
1609 case DeclSpec::TST_typeofExpr: {
1610 Expr *E = DS.getRepAsExpr();
1611 assert(E && "Didn't get an expression for typeof?");
1612 // TypeQuals handled by caller.
1613 Result = S.BuildTypeofExprType(E);
1614 if (Result.isNull()) {
1615 Result = Context.IntTy;
1616 declarator.setInvalidType(true);
1620 case DeclSpec::TST_decltype: {
1621 Expr *E = DS.getRepAsExpr();
1622 assert(E && "Didn't get an expression for decltype?");
1623 // TypeQuals handled by caller.
1624 Result = S.BuildDecltypeType(E);
1625 if (Result.isNull()) {
1626 Result = Context.IntTy;
1627 declarator.setInvalidType(true);
1631 case DeclSpec::TST_underlyingType:
1632 Result = S.GetTypeFromParser(DS.getRepAsType());
1633 assert(!Result.isNull() && "Didn't get a type for __underlying_type?");
1634 Result = S.BuildUnaryTransformType(Result,
1635 UnaryTransformType::EnumUnderlyingType,
1636 DS.getTypeSpecTypeLoc());
1637 if (Result.isNull()) {
1638 Result = Context.IntTy;
1639 declarator.setInvalidType(true);
1643 case DeclSpec::TST_auto:
1644 case DeclSpec::TST_decltype_auto: {
1645 auto AutoKW = DS.getTypeSpecType() == DeclSpec::TST_decltype_auto
1646 ? AutoTypeKeyword::DecltypeAuto
1647 : AutoTypeKeyword::Auto;
1649 ConceptDecl *TypeConstraintConcept = nullptr;
1650 llvm::SmallVector<TemplateArgument, 8> TemplateArgs;
1651 if (DS.isConstrainedAuto()) {
1652 if (TemplateIdAnnotation *TemplateId = DS.getRepAsTemplateId()) {
1653 TypeConstraintConcept =
1654 cast<ConceptDecl>(TemplateId->Template.get().getAsTemplateDecl());
1655 TemplateArgumentListInfo TemplateArgsInfo;
1656 TemplateArgsInfo.setLAngleLoc(TemplateId->LAngleLoc);
1657 TemplateArgsInfo.setRAngleLoc(TemplateId->RAngleLoc);
1658 ASTTemplateArgsPtr TemplateArgsPtr(TemplateId->getTemplateArgs(),
1659 TemplateId->NumArgs);
1660 S.translateTemplateArguments(TemplateArgsPtr, TemplateArgsInfo);
1661 for (const auto &ArgLoc : TemplateArgsInfo.arguments())
1662 TemplateArgs.push_back(ArgLoc.getArgument());
1664 declarator.setInvalidType(true);
1667 Result = S.Context.getAutoType(QualType(), AutoKW,
1668 /*IsDependent*/ false, /*IsPack=*/false,
1669 TypeConstraintConcept, TemplateArgs);
1673 case DeclSpec::TST_auto_type:
1674 Result = Context.getAutoType(QualType(), AutoTypeKeyword::GNUAutoType, false);
1677 case DeclSpec::TST_unknown_anytype:
1678 Result = Context.UnknownAnyTy;
1681 case DeclSpec::TST_atomic:
1682 Result = S.GetTypeFromParser(DS.getRepAsType());
1683 assert(!Result.isNull() && "Didn't get a type for _Atomic?");
1684 Result = S.BuildAtomicType(Result, DS.getTypeSpecTypeLoc());
1685 if (Result.isNull()) {
1686 Result = Context.IntTy;
1687 declarator.setInvalidType(true);
1691 #define GENERIC_IMAGE_TYPE(ImgType, Id) \
1692 case DeclSpec::TST_##ImgType##_t: \
1693 switch (getImageAccess(DS.getAttributes())) { \
1694 case OpenCLAccessAttr::Keyword_write_only: \
1695 Result = Context.Id##WOTy; \
1697 case OpenCLAccessAttr::Keyword_read_write: \
1698 Result = Context.Id##RWTy; \
1700 case OpenCLAccessAttr::Keyword_read_only: \
1701 Result = Context.Id##ROTy; \
1703 case OpenCLAccessAttr::SpellingNotCalculated: \
1704 llvm_unreachable("Spelling not yet calculated"); \
1707 #include "clang/Basic/OpenCLImageTypes.def"
1709 case DeclSpec::TST_error:
1710 Result = Context.IntTy;
1711 declarator.setInvalidType(true);
1715 // FIXME: we want resulting declarations to be marked invalid, but claiming
1716 // the type is invalid is too strong - e.g. it causes ActOnTypeName to return
1718 if (Result->containsErrors())
1719 declarator.setInvalidType();
1721 if (S.getLangOpts().OpenCL) {
1722 const auto &OpenCLOptions = S.getOpenCLOptions();
1723 bool IsOpenCLC30Compatible =
1724 S.getLangOpts().getOpenCLCompatibleVersion() == 300;
1725 // OpenCL C v3.0 s6.3.3 - OpenCL image types require __opencl_c_images
1727 // OpenCL C v3.0 s6.2.1 - OpenCL 3d image write types requires support
1728 // for OpenCL C 2.0, or OpenCL C 3.0 or newer and the
1729 // __opencl_c_3d_image_writes feature. OpenCL C v3.0 API s4.2 - For devices
1730 // that support OpenCL 3.0, cl_khr_3d_image_writes must be returned when and
1731 // only when the optional feature is supported
1732 if ((Result->isImageType() || Result->isSamplerT()) &&
1733 (IsOpenCLC30Compatible &&
1734 !OpenCLOptions.isSupported("__opencl_c_images", S.getLangOpts()))) {
1735 S.Diag(DS.getTypeSpecTypeLoc(), diag::err_opencl_requires_extension)
1736 << 0 << Result << "__opencl_c_images";
1737 declarator.setInvalidType();
1738 } else if (Result->isOCLImage3dWOType() &&
1739 !OpenCLOptions.isSupported("cl_khr_3d_image_writes",
1741 S.Diag(DS.getTypeSpecTypeLoc(), diag::err_opencl_requires_extension)
1743 << (IsOpenCLC30Compatible
1744 ? "cl_khr_3d_image_writes and __opencl_c_3d_image_writes"
1745 : "cl_khr_3d_image_writes");
1746 declarator.setInvalidType();
1750 bool IsFixedPointType = DS.getTypeSpecType() == DeclSpec::TST_accum ||
1751 DS.getTypeSpecType() == DeclSpec::TST_fract;
1753 // Only fixed point types can be saturated
1754 if (DS.isTypeSpecSat() && !IsFixedPointType)
1755 S.Diag(DS.getTypeSpecSatLoc(), diag::err_invalid_saturation_spec)
1756 << DS.getSpecifierName(DS.getTypeSpecType(),
1757 Context.getPrintingPolicy());
1759 // Handle complex types.
1760 if (DS.getTypeSpecComplex() == DeclSpec::TSC_complex) {
1761 if (S.getLangOpts().Freestanding)
1762 S.Diag(DS.getTypeSpecComplexLoc(), diag::ext_freestanding_complex);
1763 Result = Context.getComplexType(Result);
1764 } else if (DS.isTypeAltiVecVector()) {
1765 unsigned typeSize = static_cast<unsigned>(Context.getTypeSize(Result));
1766 assert(typeSize > 0 && "type size for vector must be greater than 0 bits");
1767 VectorType::VectorKind VecKind = VectorType::AltiVecVector;
1768 if (DS.isTypeAltiVecPixel())
1769 VecKind = VectorType::AltiVecPixel;
1770 else if (DS.isTypeAltiVecBool())
1771 VecKind = VectorType::AltiVecBool;
1772 Result = Context.getVectorType(Result, 128/typeSize, VecKind);
1775 // FIXME: Imaginary.
1776 if (DS.getTypeSpecComplex() == DeclSpec::TSC_imaginary)
1777 S.Diag(DS.getTypeSpecComplexLoc(), diag::err_imaginary_not_supported);
1779 // Before we process any type attributes, synthesize a block literal
1780 // function declarator if necessary.
1781 if (declarator.getContext() == DeclaratorContext::BlockLiteral)
1782 maybeSynthesizeBlockSignature(state, Result);
1784 // Apply any type attributes from the decl spec. This may cause the
1785 // list of type attributes to be temporarily saved while the type
1786 // attributes are pushed around.
1787 // pipe attributes will be handled later ( at GetFullTypeForDeclarator )
1788 if (!DS.isTypeSpecPipe()) {
1789 // We also apply declaration attributes that "slide" to the decl spec.
1790 // Ordering can be important for attributes. The decalaration attributes
1791 // come syntactically before the decl spec attributes, so we process them
1793 ParsedAttributesView SlidingAttrs;
1794 for (ParsedAttr &AL : declarator.getDeclarationAttributes()) {
1795 if (AL.slidesFromDeclToDeclSpecLegacyBehavior()) {
1796 SlidingAttrs.addAtEnd(&AL);
1798 // For standard syntax attributes, which would normally appertain to the
1799 // declaration here, suggest moving them to the type instead. But only
1800 // do this for our own vendor attributes; moving other vendors'
1801 // attributes might hurt portability.
1802 // There's one special case that we need to deal with here: The
1803 // `MatrixType` attribute may only be used in a typedef declaration. If
1804 // it's being used anywhere else, don't output the warning as
1805 // ProcessDeclAttributes() will output an error anyway.
1806 if (AL.isStandardAttributeSyntax() && AL.isClangScope() &&
1807 !(AL.getKind() == ParsedAttr::AT_MatrixType &&
1808 DS.getStorageClassSpec() != DeclSpec::SCS_typedef)) {
1809 S.Diag(AL.getLoc(), diag::warn_type_attribute_deprecated_on_decl)
1814 // During this call to processTypeAttrs(),
1815 // TypeProcessingState::getCurrentAttributes() will erroneously return a
1816 // reference to the DeclSpec attributes, rather than the declaration
1817 // attributes. However, this doesn't matter, as getCurrentAttributes()
1818 // is only called when distributing attributes from one attribute list
1819 // to another. Declaration attributes are always C++11 attributes, and these
1820 // are never distributed.
1821 processTypeAttrs(state, Result, TAL_DeclSpec, SlidingAttrs);
1822 processTypeAttrs(state, Result, TAL_DeclSpec, DS.getAttributes());
1825 // Apply const/volatile/restrict qualifiers to T.
1826 if (unsigned TypeQuals = DS.getTypeQualifiers()) {
1827 // Warn about CV qualifiers on function types.
1829 // If the specification of a function type includes any type qualifiers,
1830 // the behavior is undefined.
1831 // C++11 [dcl.fct]p7:
1832 // The effect of a cv-qualifier-seq in a function declarator is not the
1833 // same as adding cv-qualification on top of the function type. In the
1834 // latter case, the cv-qualifiers are ignored.
1835 if (Result->isFunctionType()) {
1836 diagnoseAndRemoveTypeQualifiers(
1837 S, DS, TypeQuals, Result, DeclSpec::TQ_const | DeclSpec::TQ_volatile,
1838 S.getLangOpts().CPlusPlus
1839 ? diag::warn_typecheck_function_qualifiers_ignored
1840 : diag::warn_typecheck_function_qualifiers_unspecified);
1841 // No diagnostic for 'restrict' or '_Atomic' applied to a
1842 // function type; we'll diagnose those later, in BuildQualifiedType.
1845 // C++11 [dcl.ref]p1:
1846 // Cv-qualified references are ill-formed except when the
1847 // cv-qualifiers are introduced through the use of a typedef-name
1848 // or decltype-specifier, in which case the cv-qualifiers are ignored.
1850 // There don't appear to be any other contexts in which a cv-qualified
1851 // reference type could be formed, so the 'ill-formed' clause here appears
1853 if (TypeQuals && Result->isReferenceType()) {
1854 diagnoseAndRemoveTypeQualifiers(
1855 S, DS, TypeQuals, Result,
1856 DeclSpec::TQ_const | DeclSpec::TQ_volatile | DeclSpec::TQ_atomic,
1857 diag::warn_typecheck_reference_qualifiers);
1860 // C90 6.5.3 constraints: "The same type qualifier shall not appear more
1861 // than once in the same specifier-list or qualifier-list, either directly
1862 // or via one or more typedefs."
1863 if (!S.getLangOpts().C99 && !S.getLangOpts().CPlusPlus
1864 && TypeQuals & Result.getCVRQualifiers()) {
1865 if (TypeQuals & DeclSpec::TQ_const && Result.isConstQualified()) {
1866 S.Diag(DS.getConstSpecLoc(), diag::ext_duplicate_declspec)
1870 if (TypeQuals & DeclSpec::TQ_volatile && Result.isVolatileQualified()) {
1871 S.Diag(DS.getVolatileSpecLoc(), diag::ext_duplicate_declspec)
1875 // C90 doesn't have restrict nor _Atomic, so it doesn't force us to
1876 // produce a warning in this case.
1879 QualType Qualified = S.BuildQualifiedType(Result, DeclLoc, TypeQuals, &DS);
1881 // If adding qualifiers fails, just use the unqualified type.
1882 if (Qualified.isNull())
1883 declarator.setInvalidType(true);
1888 assert(!Result.isNull() && "This function should not return a null type");
1892 static std::string getPrintableNameForEntity(DeclarationName Entity) {
1894 return Entity.getAsString();
1899 static bool isDependentOrGNUAutoType(QualType T) {
1900 if (T->isDependentType())
1903 const auto *AT = dyn_cast<AutoType>(T);
1904 return AT && AT->isGNUAutoType();
1907 QualType Sema::BuildQualifiedType(QualType T, SourceLocation Loc,
1908 Qualifiers Qs, const DeclSpec *DS) {
1912 // Ignore any attempt to form a cv-qualified reference.
1913 if (T->isReferenceType()) {
1915 Qs.removeVolatile();
1918 // Enforce C99 6.7.3p2: "Types other than pointer types derived from
1919 // object or incomplete types shall not be restrict-qualified."
1920 if (Qs.hasRestrict()) {
1921 unsigned DiagID = 0;
1924 if (T->isAnyPointerType() || T->isReferenceType() ||
1925 T->isMemberPointerType()) {
1927 if (T->isObjCObjectPointerType())
1929 else if (const MemberPointerType *PTy = T->getAs<MemberPointerType>())
1930 EltTy = PTy->getPointeeType();
1932 EltTy = T->getPointeeType();
1934 // If we have a pointer or reference, the pointee must have an object
1936 if (!EltTy->isIncompleteOrObjectType()) {
1937 DiagID = diag::err_typecheck_invalid_restrict_invalid_pointee;
1940 } else if (!isDependentOrGNUAutoType(T)) {
1941 // For an __auto_type variable, we may not have seen the initializer yet
1942 // and so have no idea whether the underlying type is a pointer type or
1944 DiagID = diag::err_typecheck_invalid_restrict_not_pointer;
1949 Diag(DS ? DS->getRestrictSpecLoc() : Loc, DiagID) << ProblemTy;
1950 Qs.removeRestrict();
1954 return Context.getQualifiedType(T, Qs);
1957 QualType Sema::BuildQualifiedType(QualType T, SourceLocation Loc,
1958 unsigned CVRAU, const DeclSpec *DS) {
1962 // Ignore any attempt to form a cv-qualified reference.
1963 if (T->isReferenceType())
1965 ~(DeclSpec::TQ_const | DeclSpec::TQ_volatile | DeclSpec::TQ_atomic);
1967 // Convert from DeclSpec::TQ to Qualifiers::TQ by just dropping TQ_atomic and
1969 unsigned CVR = CVRAU & ~(DeclSpec::TQ_atomic | DeclSpec::TQ_unaligned);
1972 // If the same qualifier appears more than once in the same
1973 // specifier-qualifier-list, either directly or via one or more typedefs,
1974 // the behavior is the same as if it appeared only once.
1976 // It's not specified what happens when the _Atomic qualifier is applied to
1977 // a type specified with the _Atomic specifier, but we assume that this
1978 // should be treated as if the _Atomic qualifier appeared multiple times.
1979 if (CVRAU & DeclSpec::TQ_atomic && !T->isAtomicType()) {
1981 // If other qualifiers appear along with the _Atomic qualifier in a
1982 // specifier-qualifier-list, the resulting type is the so-qualified
1985 // Don't need to worry about array types here, since _Atomic can't be
1986 // applied to such types.
1987 SplitQualType Split = T.getSplitUnqualifiedType();
1988 T = BuildAtomicType(QualType(Split.Ty, 0),
1989 DS ? DS->getAtomicSpecLoc() : Loc);
1992 Split.Quals.addCVRQualifiers(CVR);
1993 return BuildQualifiedType(T, Loc, Split.Quals);
1996 Qualifiers Q = Qualifiers::fromCVRMask(CVR);
1997 Q.setUnaligned(CVRAU & DeclSpec::TQ_unaligned);
1998 return BuildQualifiedType(T, Loc, Q, DS);
2001 /// Build a paren type including \p T.
2002 QualType Sema::BuildParenType(QualType T) {
2003 return Context.getParenType(T);
2006 /// Given that we're building a pointer or reference to the given
2007 static QualType inferARCLifetimeForPointee(Sema &S, QualType type,
2010 // Bail out if retention is unrequired or already specified.
2011 if (!type->isObjCLifetimeType() ||
2012 type.getObjCLifetime() != Qualifiers::OCL_None)
2015 Qualifiers::ObjCLifetime implicitLifetime = Qualifiers::OCL_None;
2017 // If the object type is const-qualified, we can safely use
2018 // __unsafe_unretained. This is safe (because there are no read
2019 // barriers), and it'll be safe to coerce anything but __weak* to
2020 // the resulting type.
2021 if (type.isConstQualified()) {
2022 implicitLifetime = Qualifiers::OCL_ExplicitNone;
2024 // Otherwise, check whether the static type does not require
2025 // retaining. This currently only triggers for Class (possibly
2026 // protocol-qualifed, and arrays thereof).
2027 } else if (type->isObjCARCImplicitlyUnretainedType()) {
2028 implicitLifetime = Qualifiers::OCL_ExplicitNone;
2030 // If we are in an unevaluated context, like sizeof, skip adding a
2032 } else if (S.isUnevaluatedContext()) {
2035 // If that failed, give an error and recover using __strong. __strong
2036 // is the option most likely to prevent spurious second-order diagnostics,
2037 // like when binding a reference to a field.
2039 // These types can show up in private ivars in system headers, so
2040 // we need this to not be an error in those cases. Instead we
2042 if (S.DelayedDiagnostics.shouldDelayDiagnostics()) {
2043 S.DelayedDiagnostics.add(
2044 sema::DelayedDiagnostic::makeForbiddenType(loc,
2045 diag::err_arc_indirect_no_ownership, type, isReference));
2047 S.Diag(loc, diag::err_arc_indirect_no_ownership) << type << isReference;
2049 implicitLifetime = Qualifiers::OCL_Strong;
2051 assert(implicitLifetime && "didn't infer any lifetime!");
2054 qs.addObjCLifetime(implicitLifetime);
2055 return S.Context.getQualifiedType(type, qs);
2058 static std::string getFunctionQualifiersAsString(const FunctionProtoType *FnTy){
2059 std::string Quals = FnTy->getMethodQuals().getAsString();
2061 switch (FnTy->getRefQualifier()) {
2082 /// Kinds of declarator that cannot contain a qualified function type.
2084 /// C++98 [dcl.fct]p4 / C++11 [dcl.fct]p6:
2085 /// a function type with a cv-qualifier or a ref-qualifier can only appear
2086 /// at the topmost level of a type.
2088 /// Parens and member pointers are permitted. We don't diagnose array and
2089 /// function declarators, because they don't allow function types at all.
2091 /// The values of this enum are used in diagnostics.
2092 enum QualifiedFunctionKind { QFK_BlockPointer, QFK_Pointer, QFK_Reference };
2093 } // end anonymous namespace
2095 /// Check whether the type T is a qualified function type, and if it is,
2096 /// diagnose that it cannot be contained within the given kind of declarator.
2097 static bool checkQualifiedFunction(Sema &S, QualType T, SourceLocation Loc,
2098 QualifiedFunctionKind QFK) {
2099 // Does T refer to a function type with a cv-qualifier or a ref-qualifier?
2100 const FunctionProtoType *FPT = T->getAs<FunctionProtoType>();
2102 (FPT->getMethodQuals().empty() && FPT->getRefQualifier() == RQ_None))
2105 S.Diag(Loc, diag::err_compound_qualified_function_type)
2106 << QFK << isa<FunctionType>(T.IgnoreParens()) << T
2107 << getFunctionQualifiersAsString(FPT);
2111 bool Sema::CheckQualifiedFunctionForTypeId(QualType T, SourceLocation Loc) {
2112 const FunctionProtoType *FPT = T->getAs<FunctionProtoType>();
2114 (FPT->getMethodQuals().empty() && FPT->getRefQualifier() == RQ_None))
2117 Diag(Loc, diag::err_qualified_function_typeid)
2118 << T << getFunctionQualifiersAsString(FPT);
2122 // Helper to deduce addr space of a pointee type in OpenCL mode.
2123 static QualType deduceOpenCLPointeeAddrSpace(Sema &S, QualType PointeeType) {
2124 if (!PointeeType->isUndeducedAutoType() && !PointeeType->isDependentType() &&
2125 !PointeeType->isSamplerT() &&
2126 !PointeeType.hasAddressSpace())
2127 PointeeType = S.getASTContext().getAddrSpaceQualType(
2128 PointeeType, S.getASTContext().getDefaultOpenCLPointeeAddrSpace());
2132 /// Build a pointer type.
2134 /// \param T The type to which we'll be building a pointer.
2136 /// \param Loc The location of the entity whose type involves this
2137 /// pointer type or, if there is no such entity, the location of the
2138 /// type that will have pointer type.
2140 /// \param Entity The name of the entity that involves the pointer
2143 /// \returns A suitable pointer type, if there are no
2144 /// errors. Otherwise, returns a NULL type.
2145 QualType Sema::BuildPointerType(QualType T,
2146 SourceLocation Loc, DeclarationName Entity) {
2147 if (T->isReferenceType()) {
2148 // C++ 8.3.2p4: There shall be no ... pointers to references ...
2149 Diag(Loc, diag::err_illegal_decl_pointer_to_reference)
2150 << getPrintableNameForEntity(Entity) << T;
2154 if (T->isFunctionType() && getLangOpts().OpenCL &&
2155 !getOpenCLOptions().isAvailableOption("__cl_clang_function_pointers",
2157 Diag(Loc, diag::err_opencl_function_pointer) << /*pointer*/ 0;
2161 if (getLangOpts().HLSL) {
2162 Diag(Loc, diag::err_hlsl_pointers_unsupported) << 0;
2166 if (checkQualifiedFunction(*this, T, Loc, QFK_Pointer))
2169 assert(!T->isObjCObjectType() && "Should build ObjCObjectPointerType");
2171 // In ARC, it is forbidden to build pointers to unqualified pointers.
2172 if (getLangOpts().ObjCAutoRefCount)
2173 T = inferARCLifetimeForPointee(*this, T, Loc, /*reference*/ false);
2175 if (getLangOpts().OpenCL)
2176 T = deduceOpenCLPointeeAddrSpace(*this, T);
2178 // Build the pointer type.
2179 return Context.getPointerType(T);
2182 /// Build a reference type.
2184 /// \param T The type to which we'll be building a reference.
2186 /// \param Loc The location of the entity whose type involves this
2187 /// reference type or, if there is no such entity, the location of the
2188 /// type that will have reference type.
2190 /// \param Entity The name of the entity that involves the reference
2193 /// \returns A suitable reference type, if there are no
2194 /// errors. Otherwise, returns a NULL type.
2195 QualType Sema::BuildReferenceType(QualType T, bool SpelledAsLValue,
2197 DeclarationName Entity) {
2198 assert(Context.getCanonicalType(T) != Context.OverloadTy &&
2199 "Unresolved overloaded function type");
2201 // C++0x [dcl.ref]p6:
2202 // If a typedef (7.1.3), a type template-parameter (14.3.1), or a
2203 // decltype-specifier (7.1.6.2) denotes a type TR that is a reference to a
2204 // type T, an attempt to create the type "lvalue reference to cv TR" creates
2205 // the type "lvalue reference to T", while an attempt to create the type
2206 // "rvalue reference to cv TR" creates the type TR.
2207 bool LValueRef = SpelledAsLValue || T->getAs<LValueReferenceType>();
2209 // C++ [dcl.ref]p4: There shall be no references to references.
2211 // According to C++ DR 106, references to references are only
2212 // diagnosed when they are written directly (e.g., "int & &"),
2213 // but not when they happen via a typedef:
2215 // typedef int& intref;
2216 // typedef intref& intref2;
2218 // Parser::ParseDeclaratorInternal diagnoses the case where
2219 // references are written directly; here, we handle the
2220 // collapsing of references-to-references as described in C++0x.
2221 // DR 106 and 540 introduce reference-collapsing into C++98/03.
2224 // A declarator that specifies the type "reference to cv void"
2226 if (T->isVoidType()) {
2227 Diag(Loc, diag::err_reference_to_void);
2231 if (getLangOpts().HLSL) {
2232 Diag(Loc, diag::err_hlsl_pointers_unsupported) << 1;
2236 if (checkQualifiedFunction(*this, T, Loc, QFK_Reference))
2239 if (T->isFunctionType() && getLangOpts().OpenCL &&
2240 !getOpenCLOptions().isAvailableOption("__cl_clang_function_pointers",
2242 Diag(Loc, diag::err_opencl_function_pointer) << /*reference*/ 1;
2246 // In ARC, it is forbidden to build references to unqualified pointers.
2247 if (getLangOpts().ObjCAutoRefCount)
2248 T = inferARCLifetimeForPointee(*this, T, Loc, /*reference*/ true);
2250 if (getLangOpts().OpenCL)
2251 T = deduceOpenCLPointeeAddrSpace(*this, T);
2253 // Handle restrict on references.
2255 return Context.getLValueReferenceType(T, SpelledAsLValue);
2256 return Context.getRValueReferenceType(T);
2259 /// Build a Read-only Pipe type.
2261 /// \param T The type to which we'll be building a Pipe.
2263 /// \param Loc We do not use it for now.
2265 /// \returns A suitable pipe type, if there are no errors. Otherwise, returns a
2267 QualType Sema::BuildReadPipeType(QualType T, SourceLocation Loc) {
2268 return Context.getReadPipeType(T);
2271 /// Build a Write-only Pipe type.
2273 /// \param T The type to which we'll be building a Pipe.
2275 /// \param Loc We do not use it for now.
2277 /// \returns A suitable pipe type, if there are no errors. Otherwise, returns a
2279 QualType Sema::BuildWritePipeType(QualType T, SourceLocation Loc) {
2280 return Context.getWritePipeType(T);
2283 /// Build a bit-precise integer type.
2285 /// \param IsUnsigned Boolean representing the signedness of the type.
2287 /// \param BitWidth Size of this int type in bits, or an expression representing
2290 /// \param Loc Location of the keyword.
2291 QualType Sema::BuildBitIntType(bool IsUnsigned, Expr *BitWidth,
2292 SourceLocation Loc) {
2293 if (BitWidth->isInstantiationDependent())
2294 return Context.getDependentBitIntType(IsUnsigned, BitWidth);
2296 llvm::APSInt Bits(32);
2298 VerifyIntegerConstantExpression(BitWidth, &Bits, /*FIXME*/ AllowFold);
2300 if (ICE.isInvalid())
2303 size_t NumBits = Bits.getZExtValue();
2304 if (!IsUnsigned && NumBits < 2) {
2305 Diag(Loc, diag::err_bit_int_bad_size) << 0;
2309 if (IsUnsigned && NumBits < 1) {
2310 Diag(Loc, diag::err_bit_int_bad_size) << 1;
2314 const TargetInfo &TI = getASTContext().getTargetInfo();
2315 if (NumBits > TI.getMaxBitIntWidth()) {
2316 Diag(Loc, diag::err_bit_int_max_size)
2317 << IsUnsigned << static_cast<uint64_t>(TI.getMaxBitIntWidth());
2321 return Context.getBitIntType(IsUnsigned, NumBits);
2324 /// Check whether the specified array bound can be evaluated using the relevant
2325 /// language rules. If so, returns the possibly-converted expression and sets
2326 /// SizeVal to the size. If not, but the expression might be a VLA bound,
2327 /// returns ExprResult(). Otherwise, produces a diagnostic and returns
2329 static ExprResult checkArraySize(Sema &S, Expr *&ArraySize,
2330 llvm::APSInt &SizeVal, unsigned VLADiag,
2332 if (S.getLangOpts().CPlusPlus14 &&
2334 !ArraySize->getType()->isIntegralOrUnscopedEnumerationType())) {
2335 // C++14 [dcl.array]p1:
2336 // The constant-expression shall be a converted constant expression of
2337 // type std::size_t.
2339 // Don't apply this rule if we might be forming a VLA: in that case, we
2340 // allow non-constant expressions and constant-folding. We only need to use
2341 // the converted constant expression rules (to properly convert the source)
2342 // when the source expression is of class type.
2343 return S.CheckConvertedConstantExpression(
2344 ArraySize, S.Context.getSizeType(), SizeVal, Sema::CCEK_ArrayBound);
2347 // If the size is an ICE, it certainly isn't a VLA. If we're in a GNU mode
2348 // (like gnu99, but not c99) accept any evaluatable value as an extension.
2349 class VLADiagnoser : public Sema::VerifyICEDiagnoser {
2355 VLADiagnoser(unsigned VLADiag, bool VLAIsError)
2356 : VLADiag(VLADiag), VLAIsError(VLAIsError) {}
2358 Sema::SemaDiagnosticBuilder diagnoseNotICEType(Sema &S, SourceLocation Loc,
2359 QualType T) override {
2360 return S.Diag(Loc, diag::err_array_size_non_int) << T;
2363 Sema::SemaDiagnosticBuilder diagnoseNotICE(Sema &S,
2364 SourceLocation Loc) override {
2365 IsVLA = !VLAIsError;
2366 return S.Diag(Loc, VLADiag);
2369 Sema::SemaDiagnosticBuilder diagnoseFold(Sema &S,
2370 SourceLocation Loc) override {
2371 return S.Diag(Loc, diag::ext_vla_folded_to_constant);
2373 } Diagnoser(VLADiag, VLAIsError);
2376 S.VerifyIntegerConstantExpression(ArraySize, &SizeVal, Diagnoser);
2377 if (Diagnoser.IsVLA)
2378 return ExprResult();
2382 /// Build an array type.
2384 /// \param T The type of each element in the array.
2386 /// \param ASM C99 array size modifier (e.g., '*', 'static').
2388 /// \param ArraySize Expression describing the size of the array.
2390 /// \param Brackets The range from the opening '[' to the closing ']'.
2392 /// \param Entity The name of the entity that involves the array
2395 /// \returns A suitable array type, if there are no errors. Otherwise,
2396 /// returns a NULL type.
2397 QualType Sema::BuildArrayType(QualType T, ArrayType::ArraySizeModifier ASM,
2398 Expr *ArraySize, unsigned Quals,
2399 SourceRange Brackets, DeclarationName Entity) {
2401 SourceLocation Loc = Brackets.getBegin();
2402 if (getLangOpts().CPlusPlus) {
2403 // C++ [dcl.array]p1:
2404 // T is called the array element type; this type shall not be a reference
2405 // type, the (possibly cv-qualified) type void, a function type or an
2406 // abstract class type.
2408 // C++ [dcl.array]p3:
2409 // When several "array of" specifications are adjacent, [...] only the
2410 // first of the constant expressions that specify the bounds of the arrays
2413 // Note: function types are handled in the common path with C.
2414 if (T->isReferenceType()) {
2415 Diag(Loc, diag::err_illegal_decl_array_of_references)
2416 << getPrintableNameForEntity(Entity) << T;
2420 if (T->isVoidType() || T->isIncompleteArrayType()) {
2421 Diag(Loc, diag::err_array_incomplete_or_sizeless_type) << 0 << T;
2425 if (RequireNonAbstractType(Brackets.getBegin(), T,
2426 diag::err_array_of_abstract_type))
2429 // Mentioning a member pointer type for an array type causes us to lock in
2430 // an inheritance model, even if it's inside an unused typedef.
2431 if (Context.getTargetInfo().getCXXABI().isMicrosoft())
2432 if (const MemberPointerType *MPTy = T->getAs<MemberPointerType>())
2433 if (!MPTy->getClass()->isDependentType())
2434 (void)isCompleteType(Loc, T);
2437 // C99 6.7.5.2p1: If the element type is an incomplete or function type,
2438 // reject it (e.g. void ary[7], struct foo ary[7], void ary[7]())
2439 if (RequireCompleteSizedType(Loc, T,
2440 diag::err_array_incomplete_or_sizeless_type))
2444 if (T->isSizelessType()) {
2445 Diag(Loc, diag::err_array_incomplete_or_sizeless_type) << 1 << T;
2449 if (T->isFunctionType()) {
2450 Diag(Loc, diag::err_illegal_decl_array_of_functions)
2451 << getPrintableNameForEntity(Entity) << T;
2455 if (const RecordType *EltTy = T->getAs<RecordType>()) {
2456 // If the element type is a struct or union that contains a variadic
2457 // array, accept it as a GNU extension: C99 6.7.2.1p2.
2458 if (EltTy->getDecl()->hasFlexibleArrayMember())
2459 Diag(Loc, diag::ext_flexible_array_in_array) << T;
2460 } else if (T->isObjCObjectType()) {
2461 Diag(Loc, diag::err_objc_array_of_interfaces) << T;
2465 // Do placeholder conversions on the array size expression.
2466 if (ArraySize && ArraySize->hasPlaceholderType()) {
2467 ExprResult Result = CheckPlaceholderExpr(ArraySize);
2468 if (Result.isInvalid()) return QualType();
2469 ArraySize = Result.get();
2472 // Do lvalue-to-rvalue conversions on the array size expression.
2473 if (ArraySize && !ArraySize->isPRValue()) {
2474 ExprResult Result = DefaultLvalueConversion(ArraySize);
2475 if (Result.isInvalid())
2478 ArraySize = Result.get();
2481 // C99 6.7.5.2p1: The size expression shall have integer type.
2482 // C++11 allows contextual conversions to such types.
2483 if (!getLangOpts().CPlusPlus11 &&
2484 ArraySize && !ArraySize->isTypeDependent() &&
2485 !ArraySize->getType()->isIntegralOrUnscopedEnumerationType()) {
2486 Diag(ArraySize->getBeginLoc(), diag::err_array_size_non_int)
2487 << ArraySize->getType() << ArraySize->getSourceRange();
2491 // VLAs always produce at least a -Wvla diagnostic, sometimes an error.
2494 if (getLangOpts().OpenCL) {
2495 // OpenCL v1.2 s6.9.d: variable length arrays are not supported.
2496 VLADiag = diag::err_opencl_vla;
2498 } else if (getLangOpts().C99) {
2499 VLADiag = diag::warn_vla_used;
2501 } else if (isSFINAEContext()) {
2502 VLADiag = diag::err_vla_in_sfinae;
2504 } else if (getLangOpts().OpenMP && isInOpenMPTaskUntiedContext()) {
2505 VLADiag = diag::err_openmp_vla_in_task_untied;
2508 VLADiag = diag::ext_vla;
2512 llvm::APSInt ConstVal(Context.getTypeSize(Context.getSizeType()));
2514 if (ASM == ArrayType::Star) {
2519 T = Context.getVariableArrayType(T, nullptr, ASM, Quals, Brackets);
2521 T = Context.getIncompleteArrayType(T, ASM, Quals);
2523 } else if (ArraySize->isTypeDependent() || ArraySize->isValueDependent()) {
2524 T = Context.getDependentSizedArrayType(T, ArraySize, ASM, Quals, Brackets);
2527 checkArraySize(*this, ArraySize, ConstVal, VLADiag, VLAIsError);
2531 if (!R.isUsable()) {
2532 // C99: an array with a non-ICE size is a VLA. We accept any expression
2533 // that we can fold to a non-zero positive value as a non-VLA as an
2535 T = Context.getVariableArrayType(T, ArraySize, ASM, Quals, Brackets);
2536 } else if (!T->isDependentType() && !T->isIncompleteType() &&
2537 !T->isConstantSizeType()) {
2538 // C99: an array with an element type that has a non-constant-size is a
2540 // FIXME: Add a note to explain why this isn't a VLA.
2544 T = Context.getVariableArrayType(T, ArraySize, ASM, Quals, Brackets);
2546 // C99 6.7.5.2p1: If the expression is a constant expression, it shall
2547 // have a value greater than zero.
2548 // In C++, this follows from narrowing conversions being disallowed.
2549 if (ConstVal.isSigned() && ConstVal.isNegative()) {
2551 Diag(ArraySize->getBeginLoc(), diag::err_decl_negative_array_size)
2552 << getPrintableNameForEntity(Entity)
2553 << ArraySize->getSourceRange();
2555 Diag(ArraySize->getBeginLoc(),
2556 diag::err_typecheck_negative_array_size)
2557 << ArraySize->getSourceRange();
2560 if (ConstVal == 0) {
2561 // GCC accepts zero sized static arrays. We allow them when
2562 // we're not in a SFINAE context.
2563 Diag(ArraySize->getBeginLoc(),
2564 isSFINAEContext() ? diag::err_typecheck_zero_array_size
2565 : diag::ext_typecheck_zero_array_size)
2566 << 0 << ArraySize->getSourceRange();
2569 // Is the array too large?
2570 unsigned ActiveSizeBits =
2571 (!T->isDependentType() && !T->isVariablyModifiedType() &&
2572 !T->isIncompleteType() && !T->isUndeducedType())
2573 ? ConstantArrayType::getNumAddressingBits(Context, T, ConstVal)
2574 : ConstVal.getActiveBits();
2575 if (ActiveSizeBits > ConstantArrayType::getMaxSizeBits(Context)) {
2576 Diag(ArraySize->getBeginLoc(), diag::err_array_too_large)
2577 << toString(ConstVal, 10) << ArraySize->getSourceRange();
2581 T = Context.getConstantArrayType(T, ConstVal, ArraySize, ASM, Quals);
2585 if (T->isVariableArrayType() && !Context.getTargetInfo().isVLASupported()) {
2586 // CUDA device code and some other targets don't support VLAs.
2587 targetDiag(Loc, (getLangOpts().CUDA && getLangOpts().CUDAIsDevice)
2588 ? diag::err_cuda_vla
2589 : diag::err_vla_unsupported)
2590 << ((getLangOpts().CUDA && getLangOpts().CUDAIsDevice)
2591 ? CurrentCUDATarget()
2592 : CFT_InvalidTarget);
2595 // If this is not C99, diagnose array size modifiers on non-VLAs.
2596 if (!getLangOpts().C99 && !T->isVariableArrayType() &&
2597 (ASM != ArrayType::Normal || Quals != 0)) {
2598 Diag(Loc, getLangOpts().CPlusPlus ? diag::err_c99_array_usage_cxx
2599 : diag::ext_c99_array_usage)
2603 // OpenCL v2.0 s6.12.5 - Arrays of blocks are not supported.
2604 // OpenCL v2.0 s6.16.13.1 - Arrays of pipe type are not supported.
2605 // OpenCL v2.0 s6.9.b - Arrays of image/sampler type are not supported.
2606 if (getLangOpts().OpenCL) {
2607 const QualType ArrType = Context.getBaseElementType(T);
2608 if (ArrType->isBlockPointerType() || ArrType->isPipeType() ||
2609 ArrType->isSamplerT() || ArrType->isImageType()) {
2610 Diag(Loc, diag::err_opencl_invalid_type_array) << ArrType;
2618 QualType Sema::BuildVectorType(QualType CurType, Expr *SizeExpr,
2619 SourceLocation AttrLoc) {
2620 // The base type must be integer (not Boolean or enumeration) or float, and
2621 // can't already be a vector.
2622 if ((!CurType->isDependentType() &&
2623 (!CurType->isBuiltinType() || CurType->isBooleanType() ||
2624 (!CurType->isIntegerType() && !CurType->isRealFloatingType()))) ||
2625 CurType->isArrayType()) {
2626 Diag(AttrLoc, diag::err_attribute_invalid_vector_type) << CurType;
2630 if (SizeExpr->isTypeDependent() || SizeExpr->isValueDependent())
2631 return Context.getDependentVectorType(CurType, SizeExpr, AttrLoc,
2632 VectorType::GenericVector);
2634 Optional<llvm::APSInt> VecSize = SizeExpr->getIntegerConstantExpr(Context);
2636 Diag(AttrLoc, diag::err_attribute_argument_type)
2637 << "vector_size" << AANT_ArgumentIntegerConstant
2638 << SizeExpr->getSourceRange();
2642 if (CurType->isDependentType())
2643 return Context.getDependentVectorType(CurType, SizeExpr, AttrLoc,
2644 VectorType::GenericVector);
2646 // vecSize is specified in bytes - convert to bits.
2647 if (!VecSize->isIntN(61)) {
2648 // Bit size will overflow uint64.
2649 Diag(AttrLoc, diag::err_attribute_size_too_large)
2650 << SizeExpr->getSourceRange() << "vector";
2653 uint64_t VectorSizeBits = VecSize->getZExtValue() * 8;
2654 unsigned TypeSize = static_cast<unsigned>(Context.getTypeSize(CurType));
2656 if (VectorSizeBits == 0) {
2657 Diag(AttrLoc, diag::err_attribute_zero_size)
2658 << SizeExpr->getSourceRange() << "vector";
2662 if (!TypeSize || VectorSizeBits % TypeSize) {
2663 Diag(AttrLoc, diag::err_attribute_invalid_size)
2664 << SizeExpr->getSourceRange();
2668 if (VectorSizeBits / TypeSize > std::numeric_limits<uint32_t>::max()) {
2669 Diag(AttrLoc, diag::err_attribute_size_too_large)
2670 << SizeExpr->getSourceRange() << "vector";
2674 return Context.getVectorType(CurType, VectorSizeBits / TypeSize,
2675 VectorType::GenericVector);
2678 /// Build an ext-vector type.
2680 /// Run the required checks for the extended vector type.
2681 QualType Sema::BuildExtVectorType(QualType T, Expr *ArraySize,
2682 SourceLocation AttrLoc) {
2683 // Unlike gcc's vector_size attribute, we do not allow vectors to be defined
2684 // in conjunction with complex types (pointers, arrays, functions, etc.).
2686 // Additionally, OpenCL prohibits vectors of booleans (they're considered a
2687 // reserved data type under OpenCL v2.0 s6.1.4), we don't support selects
2688 // on bitvectors, and we have no well-defined ABI for bitvectors, so vectors
2689 // of bool aren't allowed.
2691 // We explictly allow bool elements in ext_vector_type for C/C++.
2692 bool IsNoBoolVecLang = getLangOpts().OpenCL || getLangOpts().OpenCLCPlusPlus;
2693 if ((!T->isDependentType() && !T->isIntegerType() &&
2694 !T->isRealFloatingType()) ||
2695 (IsNoBoolVecLang && T->isBooleanType())) {
2696 Diag(AttrLoc, diag::err_attribute_invalid_vector_type) << T;
2700 if (!ArraySize->isTypeDependent() && !ArraySize->isValueDependent()) {
2701 Optional<llvm::APSInt> vecSize = ArraySize->getIntegerConstantExpr(Context);
2703 Diag(AttrLoc, diag::err_attribute_argument_type)
2704 << "ext_vector_type" << AANT_ArgumentIntegerConstant
2705 << ArraySize->getSourceRange();
2709 if (!vecSize->isIntN(32)) {
2710 Diag(AttrLoc, diag::err_attribute_size_too_large)
2711 << ArraySize->getSourceRange() << "vector";
2714 // Unlike gcc's vector_size attribute, the size is specified as the
2715 // number of elements, not the number of bytes.
2716 unsigned vectorSize = static_cast<unsigned>(vecSize->getZExtValue());
2718 if (vectorSize == 0) {
2719 Diag(AttrLoc, diag::err_attribute_zero_size)
2720 << ArraySize->getSourceRange() << "vector";
2724 return Context.getExtVectorType(T, vectorSize);
2727 return Context.getDependentSizedExtVectorType(T, ArraySize, AttrLoc);
2730 QualType Sema::BuildMatrixType(QualType ElementTy, Expr *NumRows, Expr *NumCols,
2731 SourceLocation AttrLoc) {
2732 assert(Context.getLangOpts().MatrixTypes &&
2733 "Should never build a matrix type when it is disabled");
2735 // Check element type, if it is not dependent.
2736 if (!ElementTy->isDependentType() &&
2737 !MatrixType::isValidElementType(ElementTy)) {
2738 Diag(AttrLoc, diag::err_attribute_invalid_matrix_type) << ElementTy;
2742 if (NumRows->isTypeDependent() || NumCols->isTypeDependent() ||
2743 NumRows->isValueDependent() || NumCols->isValueDependent())
2744 return Context.getDependentSizedMatrixType(ElementTy, NumRows, NumCols,
2747 Optional<llvm::APSInt> ValueRows = NumRows->getIntegerConstantExpr(Context);
2748 Optional<llvm::APSInt> ValueColumns =
2749 NumCols->getIntegerConstantExpr(Context);
2751 auto const RowRange = NumRows->getSourceRange();
2752 auto const ColRange = NumCols->getSourceRange();
2754 // Both are row and column expressions are invalid.
2755 if (!ValueRows && !ValueColumns) {
2756 Diag(AttrLoc, diag::err_attribute_argument_type)
2757 << "matrix_type" << AANT_ArgumentIntegerConstant << RowRange
2762 // Only the row expression is invalid.
2764 Diag(AttrLoc, diag::err_attribute_argument_type)
2765 << "matrix_type" << AANT_ArgumentIntegerConstant << RowRange;
2769 // Only the column expression is invalid.
2770 if (!ValueColumns) {
2771 Diag(AttrLoc, diag::err_attribute_argument_type)
2772 << "matrix_type" << AANT_ArgumentIntegerConstant << ColRange;
2776 // Check the matrix dimensions.
2777 unsigned MatrixRows = static_cast<unsigned>(ValueRows->getZExtValue());
2778 unsigned MatrixColumns = static_cast<unsigned>(ValueColumns->getZExtValue());
2779 if (MatrixRows == 0 && MatrixColumns == 0) {
2780 Diag(AttrLoc, diag::err_attribute_zero_size)
2781 << "matrix" << RowRange << ColRange;
2784 if (MatrixRows == 0) {
2785 Diag(AttrLoc, diag::err_attribute_zero_size) << "matrix" << RowRange;
2788 if (MatrixColumns == 0) {
2789 Diag(AttrLoc, diag::err_attribute_zero_size) << "matrix" << ColRange;
2792 if (!ConstantMatrixType::isDimensionValid(MatrixRows)) {
2793 Diag(AttrLoc, diag::err_attribute_size_too_large)
2794 << RowRange << "matrix row";
2797 if (!ConstantMatrixType::isDimensionValid(MatrixColumns)) {
2798 Diag(AttrLoc, diag::err_attribute_size_too_large)
2799 << ColRange << "matrix column";
2802 return Context.getConstantMatrixType(ElementTy, MatrixRows, MatrixColumns);
2805 bool Sema::CheckFunctionReturnType(QualType T, SourceLocation Loc) {
2806 if (T->isArrayType() || T->isFunctionType()) {
2807 Diag(Loc, diag::err_func_returning_array_function)
2808 << T->isFunctionType() << T;
2812 // Functions cannot return half FP.
2813 if (T->isHalfType() && !getLangOpts().HalfArgsAndReturns) {
2814 Diag(Loc, diag::err_parameters_retval_cannot_have_fp16_type) << 1 <<
2815 FixItHint::CreateInsertion(Loc, "*");
2819 // Methods cannot return interface types. All ObjC objects are
2820 // passed by reference.
2821 if (T->isObjCObjectType()) {
2822 Diag(Loc, diag::err_object_cannot_be_passed_returned_by_value)
2823 << 0 << T << FixItHint::CreateInsertion(Loc, "*");
2827 if (T.hasNonTrivialToPrimitiveDestructCUnion() ||
2828 T.hasNonTrivialToPrimitiveCopyCUnion())
2829 checkNonTrivialCUnion(T, Loc, NTCUC_FunctionReturn,
2830 NTCUK_Destruct|NTCUK_Copy);
2832 // C++2a [dcl.fct]p12:
2833 // A volatile-qualified return type is deprecated
2834 if (T.isVolatileQualified() && getLangOpts().CPlusPlus20)
2835 Diag(Loc, diag::warn_deprecated_volatile_return) << T;
2840 /// Check the extended parameter information. Most of the necessary
2841 /// checking should occur when applying the parameter attribute; the
2842 /// only other checks required are positional restrictions.
2843 static void checkExtParameterInfos(Sema &S, ArrayRef<QualType> paramTypes,
2844 const FunctionProtoType::ExtProtoInfo &EPI,
2845 llvm::function_ref<SourceLocation(unsigned)> getParamLoc) {
2846 assert(EPI.ExtParameterInfos && "shouldn't get here without param infos");
2848 bool emittedError = false;
2849 auto actualCC = EPI.ExtInfo.getCC();
2850 enum class RequiredCC { OnlySwift, SwiftOrSwiftAsync };
2851 auto checkCompatible = [&](unsigned paramIndex, RequiredCC required) {
2853 (required == RequiredCC::OnlySwift)
2854 ? (actualCC == CC_Swift)
2855 : (actualCC == CC_Swift || actualCC == CC_SwiftAsync);
2856 if (isCompatible || emittedError)
2858 S.Diag(getParamLoc(paramIndex), diag::err_swift_param_attr_not_swiftcall)
2859 << getParameterABISpelling(EPI.ExtParameterInfos[paramIndex].getABI())
2860 << (required == RequiredCC::OnlySwift);
2861 emittedError = true;
2863 for (size_t paramIndex = 0, numParams = paramTypes.size();
2864 paramIndex != numParams; ++paramIndex) {
2865 switch (EPI.ExtParameterInfos[paramIndex].getABI()) {
2866 // Nothing interesting to check for orindary-ABI parameters.
2867 case ParameterABI::Ordinary:
2870 // swift_indirect_result parameters must be a prefix of the function
2872 case ParameterABI::SwiftIndirectResult:
2873 checkCompatible(paramIndex, RequiredCC::SwiftOrSwiftAsync);
2874 if (paramIndex != 0 &&
2875 EPI.ExtParameterInfos[paramIndex - 1].getABI()
2876 != ParameterABI::SwiftIndirectResult) {
2877 S.Diag(getParamLoc(paramIndex),
2878 diag::err_swift_indirect_result_not_first);
2882 case ParameterABI::SwiftContext:
2883 checkCompatible(paramIndex, RequiredCC::SwiftOrSwiftAsync);
2886 // SwiftAsyncContext is not limited to swiftasynccall functions.
2887 case ParameterABI::SwiftAsyncContext:
2890 // swift_error parameters must be preceded by a swift_context parameter.
2891 case ParameterABI::SwiftErrorResult:
2892 checkCompatible(paramIndex, RequiredCC::OnlySwift);
2893 if (paramIndex == 0 ||
2894 EPI.ExtParameterInfos[paramIndex - 1].getABI() !=
2895 ParameterABI::SwiftContext) {
2896 S.Diag(getParamLoc(paramIndex),
2897 diag::err_swift_error_result_not_after_swift_context);
2901 llvm_unreachable("bad ABI kind");
2905 QualType Sema::BuildFunctionType(QualType T,
2906 MutableArrayRef<QualType> ParamTypes,
2907 SourceLocation Loc, DeclarationName Entity,
2908 const FunctionProtoType::ExtProtoInfo &EPI) {
2909 bool Invalid = false;
2911 Invalid |= CheckFunctionReturnType(T, Loc);
2913 for (unsigned Idx = 0, Cnt = ParamTypes.size(); Idx < Cnt; ++Idx) {
2914 // FIXME: Loc is too inprecise here, should use proper locations for args.
2915 QualType ParamType = Context.getAdjustedParameterType(ParamTypes[Idx]);
2916 if (ParamType->isVoidType()) {
2917 Diag(Loc, diag::err_param_with_void_type);
2919 } else if (ParamType->isHalfType() && !getLangOpts().HalfArgsAndReturns) {
2920 // Disallow half FP arguments.
2921 Diag(Loc, diag::err_parameters_retval_cannot_have_fp16_type) << 0 <<
2922 FixItHint::CreateInsertion(Loc, "*");
2926 // C++2a [dcl.fct]p4:
2927 // A parameter with volatile-qualified type is deprecated
2928 if (ParamType.isVolatileQualified() && getLangOpts().CPlusPlus20)
2929 Diag(Loc, diag::warn_deprecated_volatile_param) << ParamType;
2931 ParamTypes[Idx] = ParamType;
2934 if (EPI.ExtParameterInfos) {
2935 checkExtParameterInfos(*this, ParamTypes, EPI,
2936 [=](unsigned i) { return Loc; });
2939 if (EPI.ExtInfo.getProducesResult()) {
2940 // This is just a warning, so we can't fail to build if we see it.
2941 checkNSReturnsRetainedReturnType(Loc, T);
2947 return Context.getFunctionType(T, ParamTypes, EPI);
2950 /// Build a member pointer type \c T Class::*.
2952 /// \param T the type to which the member pointer refers.
2953 /// \param Class the class type into which the member pointer points.
2954 /// \param Loc the location where this type begins
2955 /// \param Entity the name of the entity that will have this member pointer type
2957 /// \returns a member pointer type, if successful, or a NULL type if there was
2959 QualType Sema::BuildMemberPointerType(QualType T, QualType Class,
2961 DeclarationName Entity) {
2962 // Verify that we're not building a pointer to pointer to function with
2963 // exception specification.
2964 if (CheckDistantExceptionSpec(T)) {
2965 Diag(Loc, diag::err_distant_exception_spec);
2969 // C++ 8.3.3p3: A pointer to member shall not point to ... a member
2970 // with reference type, or "cv void."
2971 if (T->isReferenceType()) {
2972 Diag(Loc, diag::err_illegal_decl_mempointer_to_reference)
2973 << getPrintableNameForEntity(Entity) << T;
2977 if (T->isVoidType()) {
2978 Diag(Loc, diag::err_illegal_decl_mempointer_to_void)
2979 << getPrintableNameForEntity(Entity);
2983 if (!Class->isDependentType() && !Class->isRecordType()) {
2984 Diag(Loc, diag::err_mempointer_in_nonclass_type) << Class;
2988 if (T->isFunctionType() && getLangOpts().OpenCL &&
2989 !getOpenCLOptions().isAvailableOption("__cl_clang_function_pointers",
2991 Diag(Loc, diag::err_opencl_function_pointer) << /*pointer*/ 0;
2995 if (getLangOpts().HLSL) {
2996 Diag(Loc, diag::err_hlsl_pointers_unsupported) << 0;
3000 // Adjust the default free function calling convention to the default method
3001 // calling convention.
3003 (Entity.getNameKind() == DeclarationName::CXXConstructorName) ||
3004 (Entity.getNameKind() == DeclarationName::CXXDestructorName);
3005 if (T->isFunctionType())
3006 adjustMemberFunctionCC(T, /*IsStatic=*/false, IsCtorOrDtor, Loc);
3008 return Context.getMemberPointerType(T, Class.getTypePtr());
3011 /// Build a block pointer type.
3013 /// \param T The type to which we'll be building a block pointer.
3015 /// \param Loc The source location, used for diagnostics.
3017 /// \param Entity The name of the entity that involves the block pointer
3020 /// \returns A suitable block pointer type, if there are no
3021 /// errors. Otherwise, returns a NULL type.
3022 QualType Sema::BuildBlockPointerType(QualType T,
3024 DeclarationName Entity) {
3025 if (!T->isFunctionType()) {
3026 Diag(Loc, diag::err_nonfunction_block_type);
3030 if (checkQualifiedFunction(*this, T, Loc, QFK_BlockPointer))
3033 if (getLangOpts().OpenCL)
3034 T = deduceOpenCLPointeeAddrSpace(*this, T);
3036 return Context.getBlockPointerType(T);
3039 QualType Sema::GetTypeFromParser(ParsedType Ty, TypeSourceInfo **TInfo) {
3040 QualType QT = Ty.get();
3042 if (TInfo) *TInfo = nullptr;
3046 TypeSourceInfo *DI = nullptr;
3047 if (const LocInfoType *LIT = dyn_cast<LocInfoType>(QT)) {
3048 QT = LIT->getType();
3049 DI = LIT->getTypeSourceInfo();
3052 if (TInfo) *TInfo = DI;
3056 static void transferARCOwnershipToDeclaratorChunk(TypeProcessingState &state,
3057 Qualifiers::ObjCLifetime ownership,
3058 unsigned chunkIndex);
3060 /// Given that this is the declaration of a parameter under ARC,
3061 /// attempt to infer attributes and such for pointer-to-whatever
3063 static void inferARCWriteback(TypeProcessingState &state,
3064 QualType &declSpecType) {
3065 Sema &S = state.getSema();
3066 Declarator &declarator = state.getDeclarator();
3068 // TODO: should we care about decl qualifiers?
3070 // Check whether the declarator has the expected form. We walk
3071 // from the inside out in order to make the block logic work.
3072 unsigned outermostPointerIndex = 0;
3073 bool isBlockPointer = false;
3074 unsigned numPointers = 0;
3075 for (unsigned i = 0, e = declarator.getNumTypeObjects(); i != e; ++i) {
3076 unsigned chunkIndex = i;
3077 DeclaratorChunk &chunk = declarator.getTypeObject(chunkIndex);
3078 switch (chunk.Kind) {
3079 case DeclaratorChunk::Paren:
3083 case DeclaratorChunk::Reference:
3084 case DeclaratorChunk::Pointer:
3085 // Count the number of pointers. Treat references
3086 // interchangeably as pointers; if they're mis-ordered, normal
3087 // type building will discover that.
3088 outermostPointerIndex = chunkIndex;
3092 case DeclaratorChunk::BlockPointer:
3093 // If we have a pointer to block pointer, that's an acceptable
3094 // indirect reference; anything else is not an application of
3096 if (numPointers != 1) return;
3098 outermostPointerIndex = chunkIndex;
3099 isBlockPointer = true;
3101 // We don't care about pointer structure in return values here.
3104 case DeclaratorChunk::Array: // suppress if written (id[])?
3105 case DeclaratorChunk::Function:
3106 case DeclaratorChunk::MemberPointer:
3107 case DeclaratorChunk::Pipe:
3113 // If we have *one* pointer, then we want to throw the qualifier on
3114 // the declaration-specifiers, which means that it needs to be a
3115 // retainable object type.
3116 if (numPointers == 1) {
3117 // If it's not a retainable object type, the rule doesn't apply.
3118 if (!declSpecType->isObjCRetainableType()) return;
3120 // If it already has lifetime, don't do anything.
3121 if (declSpecType.getObjCLifetime()) return;
3123 // Otherwise, modify the type in-place.
3126 if (declSpecType->isObjCARCImplicitlyUnretainedType())
3127 qs.addObjCLifetime(Qualifiers::OCL_ExplicitNone);
3129 qs.addObjCLifetime(Qualifiers::OCL_Autoreleasing);
3130 declSpecType = S.Context.getQualifiedType(declSpecType, qs);
3132 // If we have *two* pointers, then we want to throw the qualifier on
3133 // the outermost pointer.
3134 } else if (numPointers == 2) {
3135 // If we don't have a block pointer, we need to check whether the
3136 // declaration-specifiers gave us something that will turn into a
3137 // retainable object pointer after we slap the first pointer on it.
3138 if (!isBlockPointer && !declSpecType->isObjCObjectType())
3141 // Look for an explicit lifetime attribute there.
3142 DeclaratorChunk &chunk = declarator.getTypeObject(outermostPointerIndex);
3143 if (chunk.Kind != DeclaratorChunk::Pointer &&
3144 chunk.Kind != DeclaratorChunk::BlockPointer)
3146 for (const ParsedAttr &AL : chunk.getAttrs())
3147 if (AL.getKind() == ParsedAttr::AT_ObjCOwnership)
3150 transferARCOwnershipToDeclaratorChunk(state, Qualifiers::OCL_Autoreleasing,
3151 outermostPointerIndex);
3153 // Any other number of pointers/references does not trigger the rule.
3156 // TODO: mark whether we did this inference?
3159 void Sema::diagnoseIgnoredQualifiers(unsigned DiagID, unsigned Quals,
3160 SourceLocation FallbackLoc,
3161 SourceLocation ConstQualLoc,
3162 SourceLocation VolatileQualLoc,
3163 SourceLocation RestrictQualLoc,
3164 SourceLocation AtomicQualLoc,
3165 SourceLocation UnalignedQualLoc) {
3173 } const QualKinds[5] = {
3174 { "const", DeclSpec::TQ_const, ConstQualLoc },
3175 { "volatile", DeclSpec::TQ_volatile, VolatileQualLoc },
3176 { "restrict", DeclSpec::TQ_restrict, RestrictQualLoc },
3177 { "__unaligned", DeclSpec::TQ_unaligned, UnalignedQualLoc },
3178 { "_Atomic", DeclSpec::TQ_atomic, AtomicQualLoc }
3181 SmallString<32> QualStr;
3182 unsigned NumQuals = 0;
3184 FixItHint FixIts[5];
3186 // Build a string naming the redundant qualifiers.
3187 for (auto &E : QualKinds) {
3188 if (Quals & E.Mask) {
3189 if (!QualStr.empty()) QualStr += ' ';
3192 // If we have a location for the qualifier, offer a fixit.
3193 SourceLocation QualLoc = E.Loc;
3194 if (QualLoc.isValid()) {
3195 FixIts[NumQuals] = FixItHint::CreateRemoval(QualLoc);
3196 if (Loc.isInvalid() ||
3197 getSourceManager().isBeforeInTranslationUnit(QualLoc, Loc))
3205 Diag(Loc.isInvalid() ? FallbackLoc : Loc, DiagID)
3206 << QualStr << NumQuals << FixIts[0] << FixIts[1] << FixIts[2] << FixIts[3];
3209 // Diagnose pointless type qualifiers on the return type of a function.
3210 static void diagnoseRedundantReturnTypeQualifiers(Sema &S, QualType RetTy,
3212 unsigned FunctionChunkIndex) {
3213 const DeclaratorChunk::FunctionTypeInfo &FTI =
3214 D.getTypeObject(FunctionChunkIndex).Fun;
3215 if (FTI.hasTrailingReturnType()) {
3216 S.diagnoseIgnoredQualifiers(diag::warn_qual_return_type,
3217 RetTy.getLocalCVRQualifiers(),
3218 FTI.getTrailingReturnTypeLoc());
3222 for (unsigned OuterChunkIndex = FunctionChunkIndex + 1,
3223 End = D.getNumTypeObjects();
3224 OuterChunkIndex != End; ++OuterChunkIndex) {
3225 DeclaratorChunk &OuterChunk = D.getTypeObject(OuterChunkIndex);
3226 switch (OuterChunk.Kind) {
3227 case DeclaratorChunk::Paren:
3230 case DeclaratorChunk::Pointer: {
3231 DeclaratorChunk::PointerTypeInfo &PTI = OuterChunk.Ptr;
3232 S.diagnoseIgnoredQualifiers(
3233 diag::warn_qual_return_type,
3237 PTI.VolatileQualLoc,
3238 PTI.RestrictQualLoc,
3240 PTI.UnalignedQualLoc);
3244 case DeclaratorChunk::Function:
3245 case DeclaratorChunk::BlockPointer:
3246 case DeclaratorChunk::Reference:
3247 case DeclaratorChunk::Array:
3248 case DeclaratorChunk::MemberPointer:
3249 case DeclaratorChunk::Pipe:
3250 // FIXME: We can't currently provide an accurate source location and a
3251 // fix-it hint for these.
3252 unsigned AtomicQual = RetTy->isAtomicType() ? DeclSpec::TQ_atomic : 0;
3253 S.diagnoseIgnoredQualifiers(diag::warn_qual_return_type,
3254 RetTy.getCVRQualifiers() | AtomicQual,
3255 D.getIdentifierLoc());
3259 llvm_unreachable("unknown declarator chunk kind");
3262 // If the qualifiers come from a conversion function type, don't diagnose
3263 // them -- they're not necessarily redundant, since such a conversion
3264 // operator can be explicitly called as "x.operator const int()".
3265 if (D.getName().getKind() == UnqualifiedIdKind::IK_ConversionFunctionId)
3268 // Just parens all the way out to the decl specifiers. Diagnose any qualifiers
3269 // which are present there.
3270 S.diagnoseIgnoredQualifiers(diag::warn_qual_return_type,
3271 D.getDeclSpec().getTypeQualifiers(),
3272 D.getIdentifierLoc(),
3273 D.getDeclSpec().getConstSpecLoc(),
3274 D.getDeclSpec().getVolatileSpecLoc(),
3275 D.getDeclSpec().getRestrictSpecLoc(),
3276 D.getDeclSpec().getAtomicSpecLoc(),
3277 D.getDeclSpec().getUnalignedSpecLoc());
3280 static std::pair<QualType, TypeSourceInfo *>
3281 InventTemplateParameter(TypeProcessingState &state, QualType T,
3282 TypeSourceInfo *TrailingTSI, AutoType *Auto,
3283 InventedTemplateParameterInfo &Info) {
3284 Sema &S = state.getSema();
3285 Declarator &D = state.getDeclarator();
3287 const unsigned TemplateParameterDepth = Info.AutoTemplateParameterDepth;
3288 const unsigned AutoParameterPosition = Info.TemplateParams.size();
3289 const bool IsParameterPack = D.hasEllipsis();
3291 // If auto is mentioned in a lambda parameter or abbreviated function
3292 // template context, convert it to a template parameter type.
3294 // Create the TemplateTypeParmDecl here to retrieve the corresponding
3295 // template parameter type. Template parameters are temporarily added
3296 // to the TU until the associated TemplateDecl is created.
3297 TemplateTypeParmDecl *InventedTemplateParam =
3298 TemplateTypeParmDecl::Create(
3299 S.Context, S.Context.getTranslationUnitDecl(),
3300 /*KeyLoc=*/D.getDeclSpec().getTypeSpecTypeLoc(),
3301 /*NameLoc=*/D.getIdentifierLoc(),
3302 TemplateParameterDepth, AutoParameterPosition,
3303 S.InventAbbreviatedTemplateParameterTypeName(
3304 D.getIdentifier(), AutoParameterPosition), false,
3305 IsParameterPack, /*HasTypeConstraint=*/Auto->isConstrained());
3306 InventedTemplateParam->setImplicit();
3307 Info.TemplateParams.push_back(InventedTemplateParam);
3309 // Attach type constraints to the new parameter.
3310 if (Auto->isConstrained()) {
3312 // The 'auto' appears in a trailing return type we've already built;
3313 // extract its type constraints to attach to the template parameter.
3314 AutoTypeLoc AutoLoc = TrailingTSI->getTypeLoc().getContainedAutoTypeLoc();
3315 TemplateArgumentListInfo TAL(AutoLoc.getLAngleLoc(), AutoLoc.getRAngleLoc());
3316 bool Invalid = false;
3317 for (unsigned Idx = 0; Idx < AutoLoc.getNumArgs(); ++Idx) {
3318 if (D.getEllipsisLoc().isInvalid() && !Invalid &&
3319 S.DiagnoseUnexpandedParameterPack(AutoLoc.getArgLoc(Idx),
3320 Sema::UPPC_TypeConstraint))
3322 TAL.addArgument(AutoLoc.getArgLoc(Idx));
3326 S.AttachTypeConstraint(
3327 AutoLoc.getNestedNameSpecifierLoc(), AutoLoc.getConceptNameInfo(),
3328 AutoLoc.getNamedConcept(),
3329 AutoLoc.hasExplicitTemplateArgs() ? &TAL : nullptr,
3330 InventedTemplateParam, D.getEllipsisLoc());
3333 // The 'auto' appears in the decl-specifiers; we've not finished forming
3334 // TypeSourceInfo for it yet.
3335 TemplateIdAnnotation *TemplateId = D.getDeclSpec().getRepAsTemplateId();
3336 TemplateArgumentListInfo TemplateArgsInfo;
3337 bool Invalid = false;
3338 if (TemplateId->LAngleLoc.isValid()) {
3339 ASTTemplateArgsPtr TemplateArgsPtr(TemplateId->getTemplateArgs(),
3340 TemplateId->NumArgs);
3341 S.translateTemplateArguments(TemplateArgsPtr, TemplateArgsInfo);
3343 if (D.getEllipsisLoc().isInvalid()) {
3344 for (TemplateArgumentLoc Arg : TemplateArgsInfo.arguments()) {
3345 if (S.DiagnoseUnexpandedParameterPack(Arg,
3346 Sema::UPPC_TypeConstraint)) {
3354 S.AttachTypeConstraint(
3355 D.getDeclSpec().getTypeSpecScope().getWithLocInContext(S.Context),
3356 DeclarationNameInfo(DeclarationName(TemplateId->Name),
3357 TemplateId->TemplateNameLoc),
3358 cast<ConceptDecl>(TemplateId->Template.get().getAsTemplateDecl()),
3359 TemplateId->LAngleLoc.isValid() ? &TemplateArgsInfo : nullptr,
3360 InventedTemplateParam, D.getEllipsisLoc());
3365 // Replace the 'auto' in the function parameter with this invented
3366 // template type parameter.
3367 // FIXME: Retain some type sugar to indicate that this was written
3369 QualType Replacement(InventedTemplateParam->getTypeForDecl(), 0);
3370 QualType NewT = state.ReplaceAutoType(T, Replacement);
3371 TypeSourceInfo *NewTSI =
3372 TrailingTSI ? S.ReplaceAutoTypeSourceInfo(TrailingTSI, Replacement)
3374 return {NewT, NewTSI};
3377 static TypeSourceInfo *
3378 GetTypeSourceInfoForDeclarator(TypeProcessingState &State,
3379 QualType T, TypeSourceInfo *ReturnTypeInfo);
3381 static QualType GetDeclSpecTypeForDeclarator(TypeProcessingState &state,
3382 TypeSourceInfo *&ReturnTypeInfo) {
3383 Sema &SemaRef = state.getSema();
3384 Declarator &D = state.getDeclarator();
3386 ReturnTypeInfo = nullptr;
3388 // The TagDecl owned by the DeclSpec.
3389 TagDecl *OwnedTagDecl = nullptr;
3391 switch (D.getName().getKind()) {
3392 case UnqualifiedIdKind::IK_ImplicitSelfParam:
3393 case UnqualifiedIdKind::IK_OperatorFunctionId:
3394 case UnqualifiedIdKind::IK_Identifier:
3395 case UnqualifiedIdKind::IK_LiteralOperatorId:
3396 case UnqualifiedIdKind::IK_TemplateId:
3397 T = ConvertDeclSpecToType(state);
3399 if (!D.isInvalidType() && D.getDeclSpec().isTypeSpecOwned()) {
3400 OwnedTagDecl = cast<TagDecl>(D.getDeclSpec().getRepAsDecl());
3401 // Owned declaration is embedded in declarator.
3402 OwnedTagDecl->setEmbeddedInDeclarator(true);
3406 case UnqualifiedIdKind::IK_ConstructorName:
3407 case UnqualifiedIdKind::IK_ConstructorTemplateId:
3408 case UnqualifiedIdKind::IK_DestructorName:
3409 // Constructors and destructors don't have return types. Use
3411 T = SemaRef.Context.VoidTy;
3412 processTypeAttrs(state, T, TAL_DeclSpec,
3413 D.getMutableDeclSpec().getAttributes());
3416 case UnqualifiedIdKind::IK_DeductionGuideName:
3417 // Deduction guides have a trailing return type and no type in their
3418 // decl-specifier sequence. Use a placeholder return type for now.
3419 T = SemaRef.Context.DependentTy;
3422 case UnqualifiedIdKind::IK_ConversionFunctionId:
3423 // The result type of a conversion function is the type that it
3425 T = SemaRef.GetTypeFromParser(D.getName().ConversionFunctionId,
3430 // Note: We don't need to distribute declaration attributes (i.e.
3431 // D.getDeclarationAttributes()) because those are always C++11 attributes,
3432 // and those don't get distributed.
3433 distributeTypeAttrsFromDeclarator(state, T);
3435 // Find the deduced type in this type. Look in the trailing return type if we
3436 // have one, otherwise in the DeclSpec type.
3437 // FIXME: The standard wording doesn't currently describe this.
3438 DeducedType *Deduced = T->getContainedDeducedType();
3439 bool DeducedIsTrailingReturnType = false;
3440 if (Deduced && isa<AutoType>(Deduced) && D.hasTrailingReturnType()) {
3441 QualType T = SemaRef.GetTypeFromParser(D.getTrailingReturnType());
3442 Deduced = T.isNull() ? nullptr : T->getContainedDeducedType();
3443 DeducedIsTrailingReturnType = true;
3446 // C++11 [dcl.spec.auto]p5: reject 'auto' if it is not in an allowed context.
3448 AutoType *Auto = dyn_cast<AutoType>(Deduced);
3451 // Is this a 'auto' or 'decltype(auto)' type (as opposed to __auto_type or
3452 // class template argument deduction)?
3453 bool IsCXXAutoType =
3454 (Auto && Auto->getKeyword() != AutoTypeKeyword::GNUAutoType);
3455 bool IsDeducedReturnType = false;
3457 switch (D.getContext()) {
3458 case DeclaratorContext::LambdaExpr:
3459 // Declared return type of a lambda-declarator is implicit and is always
3462 case DeclaratorContext::ObjCParameter:
3463 case DeclaratorContext::ObjCResult:
3466 case DeclaratorContext::RequiresExpr:
3469 case DeclaratorContext::Prototype:
3470 case DeclaratorContext::LambdaExprParameter: {
3471 InventedTemplateParameterInfo *Info = nullptr;
3472 if (D.getContext() == DeclaratorContext::Prototype) {
3473 // With concepts we allow 'auto' in function parameters.
3474 if (!SemaRef.getLangOpts().CPlusPlus20 || !Auto ||
3475 Auto->getKeyword() != AutoTypeKeyword::Auto) {
3478 } else if (!SemaRef.getCurScope()->isFunctionDeclarationScope()) {
3483 Info = &SemaRef.InventedParameterInfos.back();
3485 // In C++14, generic lambdas allow 'auto' in their parameters.
3486 if (!SemaRef.getLangOpts().CPlusPlus14 || !Auto ||
3487 Auto->getKeyword() != AutoTypeKeyword::Auto) {
3491 Info = SemaRef.getCurLambda();
3492 assert(Info && "No LambdaScopeInfo on the stack!");
3495 // We'll deal with inventing template parameters for 'auto' in trailing
3496 // return types when we pick up the trailing return type when processing
3497 // the function chunk.
3498 if (!DeducedIsTrailingReturnType)
3499 T = InventTemplateParameter(state, T, nullptr, Auto, *Info).first;
3502 case DeclaratorContext::Member: {
3503 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_static ||
3504 D.isFunctionDeclarator())
3506 bool Cxx = SemaRef.getLangOpts().CPlusPlus;
3507 if (isa<ObjCContainerDecl>(SemaRef.CurContext)) {
3508 Error = 6; // Interface member.
3510 switch (cast<TagDecl>(SemaRef.CurContext)->getTagKind()) {
3511 case TTK_Enum: llvm_unreachable("unhandled tag kind");
3512 case TTK_Struct: Error = Cxx ? 1 : 2; /* Struct member */ break;
3513 case TTK_Union: Error = Cxx ? 3 : 4; /* Union member */ break;
3514 case TTK_Class: Error = 5; /* Class member */ break;
3515 case TTK_Interface: Error = 6; /* Interface member */ break;
3518 if (D.getDeclSpec().isFriendSpecified())
3519 Error = 20; // Friend type
3522 case DeclaratorContext::CXXCatch:
3523 case DeclaratorContext::ObjCCatch:
3524 Error = 7; // Exception declaration
3526 case DeclaratorContext::TemplateParam:
3527 if (isa<DeducedTemplateSpecializationType>(Deduced) &&
3528 !SemaRef.getLangOpts().CPlusPlus20)
3529 Error = 19; // Template parameter (until C++20)
3530 else if (!SemaRef.getLangOpts().CPlusPlus17)
3531 Error = 8; // Template parameter (until C++17)
3533 case DeclaratorContext::BlockLiteral:
3534 Error = 9; // Block literal
3536 case DeclaratorContext::TemplateArg:
3537 // Within a template argument list, a deduced template specialization
3538 // type will be reinterpreted as a template template argument.
3539 if (isa<DeducedTemplateSpecializationType>(Deduced) &&
3540 !D.getNumTypeObjects() &&
3541 D.getDeclSpec().getParsedSpecifiers() == DeclSpec::PQ_TypeSpecifier)
3544 case DeclaratorContext::TemplateTypeArg:
3545 Error = 10; // Template type argument
3547 case DeclaratorContext::AliasDecl:
3548 case DeclaratorContext::AliasTemplate:
3549 Error = 12; // Type alias
3551 case DeclaratorContext::TrailingReturn:
3552 case DeclaratorContext::TrailingReturnVar:
3553 if (!SemaRef.getLangOpts().CPlusPlus14 || !IsCXXAutoType)
3554 Error = 13; // Function return type
3555 IsDeducedReturnType = true;
3557 case DeclaratorContext::ConversionId:
3558 if (!SemaRef.getLangOpts().CPlusPlus14 || !IsCXXAutoType)
3559 Error = 14; // conversion-type-id
3560 IsDeducedReturnType = true;
3562 case DeclaratorContext::FunctionalCast:
3563 if (isa<DeducedTemplateSpecializationType>(Deduced))
3565 if (SemaRef.getLangOpts().CPlusPlus2b && IsCXXAutoType &&
3566 !Auto->isDecltypeAuto())
3569 case DeclaratorContext::TypeName:
3570 case DeclaratorContext::Association:
3571 Error = 15; // Generic
3573 case DeclaratorContext::File:
3574 case DeclaratorContext::Block:
3575 case DeclaratorContext::ForInit:
3576 case DeclaratorContext::SelectionInit:
3577 case DeclaratorContext::Condition:
3578 // FIXME: P0091R3 (erroneously) does not permit class template argument
3579 // deduction in conditions, for-init-statements, and other declarations
3580 // that are not simple-declarations.
3582 case DeclaratorContext::CXXNew:
3583 // FIXME: P0091R3 does not permit class template argument deduction here,
3584 // but we follow GCC and allow it anyway.
3585 if (!IsCXXAutoType && !isa<DeducedTemplateSpecializationType>(Deduced))
3586 Error = 17; // 'new' type
3588 case DeclaratorContext::KNRTypeList:
3589 Error = 18; // K&R function parameter
3593 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef)
3596 // In Objective-C it is an error to use 'auto' on a function declarator
3597 // (and everywhere for '__auto_type').
3598 if (D.isFunctionDeclarator() &&
3599 (!SemaRef.getLangOpts().CPlusPlus11 || !IsCXXAutoType))
3602 SourceRange AutoRange = D.getDeclSpec().getTypeSpecTypeLoc();
3603 if (D.getName().getKind() == UnqualifiedIdKind::IK_ConversionFunctionId)
3604 AutoRange = D.getName().getSourceRange();
3609 switch (Auto->getKeyword()) {
3610 case AutoTypeKeyword::Auto: Kind = 0; break;
3611 case AutoTypeKeyword::DecltypeAuto: Kind = 1; break;
3612 case AutoTypeKeyword::GNUAutoType: Kind = 2; break;
3615 assert(isa<DeducedTemplateSpecializationType>(Deduced) &&
3616 "unknown auto type");
3620 auto *DTST = dyn_cast<DeducedTemplateSpecializationType>(Deduced);
3621 TemplateName TN = DTST ? DTST->getTemplateName() : TemplateName();
3623 SemaRef.Diag(AutoRange.getBegin(), diag::err_auto_not_allowed)
3624 << Kind << Error << (int)SemaRef.getTemplateNameKindForDiagnostics(TN)
3625 << QualType(Deduced, 0) << AutoRange;
3626 if (auto *TD = TN.getAsTemplateDecl())
3627 SemaRef.Diag(TD->getLocation(), diag::note_template_decl_here);
3629 T = SemaRef.Context.IntTy;
3630 D.setInvalidType(true);
3631 } else if (Auto && D.getContext() != DeclaratorContext::LambdaExpr) {
3632 // If there was a trailing return type, we already got
3633 // warn_cxx98_compat_trailing_return_type in the parser.
3634 SemaRef.Diag(AutoRange.getBegin(),
3635 D.getContext() == DeclaratorContext::LambdaExprParameter
3636 ? diag::warn_cxx11_compat_generic_lambda
3637 : IsDeducedReturnType
3638 ? diag::warn_cxx11_compat_deduced_return_type
3639 : diag::warn_cxx98_compat_auto_type_specifier)
3644 if (SemaRef.getLangOpts().CPlusPlus &&
3645 OwnedTagDecl && OwnedTagDecl->isCompleteDefinition()) {
3646 // Check the contexts where C++ forbids the declaration of a new class
3647 // or enumeration in a type-specifier-seq.
3648 unsigned DiagID = 0;
3649 switch (D.getContext()) {
3650 case DeclaratorContext::TrailingReturn:
3651 case DeclaratorContext::TrailingReturnVar:
3652 // Class and enumeration definitions are syntactically not allowed in
3653 // trailing return types.
3654 llvm_unreachable("parser should not have allowed this");
3656 case DeclaratorContext::File:
3657 case DeclaratorContext::Member:
3658 case DeclaratorContext::Block:
3659 case DeclaratorContext::ForInit:
3660 case DeclaratorContext::SelectionInit:
3661 case DeclaratorContext::BlockLiteral:
3662 case DeclaratorContext::LambdaExpr:
3663 // C++11 [dcl.type]p3:
3664 // A type-specifier-seq shall not define a class or enumeration unless
3665 // it appears in the type-id of an alias-declaration (7.1.3) that is not
3666 // the declaration of a template-declaration.
3667 case DeclaratorContext::AliasDecl:
3669 case DeclaratorContext::AliasTemplate:
3670 DiagID = diag::err_type_defined_in_alias_template;
3672 case DeclaratorContext::TypeName:
3673 case DeclaratorContext::FunctionalCast:
3674 case DeclaratorContext::ConversionId:
3675 case DeclaratorContext::TemplateParam:
3676 case DeclaratorContext::CXXNew:
3677 case DeclaratorContext::CXXCatch:
3678 case DeclaratorContext::ObjCCatch:
3679 case DeclaratorContext::TemplateArg:
3680 case DeclaratorContext::TemplateTypeArg:
3681 case DeclaratorContext::Association:
3682 DiagID = diag::err_type_defined_in_type_specifier;
3684 case DeclaratorContext::Prototype:
3685 case DeclaratorContext::LambdaExprParameter:
3686 case DeclaratorContext::ObjCParameter:
3687 case DeclaratorContext::ObjCResult:
3688 case DeclaratorContext::KNRTypeList:
3689 case DeclaratorContext::RequiresExpr:
3691 // Types shall not be defined in return or parameter types.
3692 DiagID = diag::err_type_defined_in_param_type;
3694 case DeclaratorContext::Condition:
3696 // The type-specifier-seq shall not contain typedef and shall not declare
3697 // a new class or enumeration.
3698 DiagID = diag::err_type_defined_in_condition;
3703 SemaRef.Diag(OwnedTagDecl->getLocation(), DiagID)
3704 << SemaRef.Context.getTypeDeclType(OwnedTagDecl);
3705 D.setInvalidType(true);
3709 assert(!T.isNull() && "This function should not return a null type");
3713 /// Produce an appropriate diagnostic for an ambiguity between a function
3714 /// declarator and a C++ direct-initializer.
3715 static void warnAboutAmbiguousFunction(Sema &S, Declarator &D,
3716 DeclaratorChunk &DeclType, QualType RT) {
3717 const DeclaratorChunk::FunctionTypeInfo &FTI = DeclType.Fun;
3718 assert(FTI.isAmbiguous && "no direct-initializer / function ambiguity");
3720 // If the return type is void there is no ambiguity.
3721 if (RT->isVoidType())
3724 // An initializer for a non-class type can have at most one argument.
3725 if (!RT->isRecordType() && FTI.NumParams > 1)
3728 // An initializer for a reference must have exactly one argument.
3729 if (RT->isReferenceType() && FTI.NumParams != 1)
3732 // Only warn if this declarator is declaring a function at block scope, and
3733 // doesn't have a storage class (such as 'extern') specified.
3734 if (!D.isFunctionDeclarator() ||
3735 D.getFunctionDefinitionKind() != FunctionDefinitionKind::Declaration ||
3736 !S.CurContext->isFunctionOrMethod() ||
3737 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_unspecified)
3740 // Inside a condition, a direct initializer is not permitted. We allow one to
3741 // be parsed in order to give better diagnostics in condition parsing.
3742 if (D.getContext() == DeclaratorContext::Condition)
3745 SourceRange ParenRange(DeclType.Loc, DeclType.EndLoc);
3747 S.Diag(DeclType.Loc,
3748 FTI.NumParams ? diag::warn_parens_disambiguated_as_function_declaration
3749 : diag::warn_empty_parens_are_function_decl)
3752 // If the declaration looks like:
3755 // and name lookup finds a function named 'f', then the ',' was
3756 // probably intended to be a ';'.
3757 if (!D.isFirstDeclarator() && D.getIdentifier()) {
3758 FullSourceLoc Comma(D.getCommaLoc(), S.SourceMgr);
3759 FullSourceLoc Name(D.getIdentifierLoc(), S.SourceMgr);
3760 if (Comma.getFileID() != Name.getFileID() ||
3761 Comma.getSpellingLineNumber() != Name.getSpellingLineNumber()) {
3762 LookupResult Result(S, D.getIdentifier(), SourceLocation(),
3763 Sema::LookupOrdinaryName);
3764 if (S.LookupName(Result, S.getCurScope()))
3765 S.Diag(D.getCommaLoc(), diag::note_empty_parens_function_call)
3766 << FixItHint::CreateReplacement(D.getCommaLoc(), ";")
3767 << D.getIdentifier();
3768 Result.suppressDiagnostics();
3772 if (FTI.NumParams > 0) {
3773 // For a declaration with parameters, eg. "T var(T());", suggest adding
3774 // parens around the first parameter to turn the declaration into a
3775 // variable declaration.
3776 SourceRange Range = FTI.Params[0].Param->getSourceRange();
3777 SourceLocation B = Range.getBegin();
3778 SourceLocation E = S.getLocForEndOfToken(Range.getEnd());
3779 // FIXME: Maybe we should suggest adding braces instead of parens
3780 // in C++11 for classes that don't have an initializer_list constructor.
3781 S.Diag(B, diag::note_additional_parens_for_variable_declaration)
3782 << FixItHint::CreateInsertion(B, "(")
3783 << FixItHint::CreateInsertion(E, ")");
3785 // For a declaration without parameters, eg. "T var();", suggest replacing
3786 // the parens with an initializer to turn the declaration into a variable
3788 const CXXRecordDecl *RD = RT->getAsCXXRecordDecl();
3790 // Empty parens mean value-initialization, and no parens mean
3791 // default initialization. These are equivalent if the default
3792 // constructor is user-provided or if zero-initialization is a
3794 if (RD && RD->hasDefinition() &&
3795 (RD->isEmpty() || RD->hasUserProvidedDefaultConstructor()))
3796 S.Diag(DeclType.Loc, diag::note_empty_parens_default_ctor)
3797 << FixItHint::CreateRemoval(ParenRange);
3800 S.getFixItZeroInitializerForType(RT, ParenRange.getBegin());
3801 if (Init.empty() && S.LangOpts.CPlusPlus11)
3804 S.Diag(DeclType.Loc, diag::note_empty_parens_zero_initialize)
3805 << FixItHint::CreateReplacement(ParenRange, Init);
3810 /// Produce an appropriate diagnostic for a declarator with top-level
3812 static void warnAboutRedundantParens(Sema &S, Declarator &D, QualType T) {
3813 DeclaratorChunk &Paren = D.getTypeObject(D.getNumTypeObjects() - 1);
3814 assert(Paren.Kind == DeclaratorChunk::Paren &&
3815 "do not have redundant top-level parentheses");
3817 // This is a syntactic check; we're not interested in cases that arise
3818 // during template instantiation.
3819 if (S.inTemplateInstantiation())
3822 // Check whether this could be intended to be a construction of a temporary
3823 // object in C++ via a function-style cast.
3824 bool CouldBeTemporaryObject =
3825 S.getLangOpts().CPlusPlus && D.isExpressionContext() &&
3826 !D.isInvalidType() && D.getIdentifier() &&
3827 D.getDeclSpec().getParsedSpecifiers() == DeclSpec::PQ_TypeSpecifier &&
3828 (T->isRecordType() || T->isDependentType()) &&
3829 D.getDeclSpec().getTypeQualifiers() == 0 && D.isFirstDeclarator();
3831 bool StartsWithDeclaratorId = true;
3832 for (auto &C : D.type_objects()) {
3834 case DeclaratorChunk::Paren:
3838 case DeclaratorChunk::Pointer:
3839 StartsWithDeclaratorId = false;
3842 case DeclaratorChunk::Array:
3844 CouldBeTemporaryObject = false;
3847 case DeclaratorChunk::Reference:
3848 // FIXME: Suppress the warning here if there is no initializer; we're
3849 // going to give an error anyway.
3850 // We assume that something like 'T (&x) = y;' is highly likely to not
3851 // be intended to be a temporary object.
3852 CouldBeTemporaryObject = false;
3853 StartsWithDeclaratorId = false;
3856 case DeclaratorChunk::Function:
3857 // In a new-type-id, function chunks require parentheses.
3858 if (D.getContext() == DeclaratorContext::CXXNew)
3860 // FIXME: "A(f())" deserves a vexing-parse warning, not just a
3861 // redundant-parens warning, but we don't know whether the function
3862 // chunk was syntactically valid as an expression here.
3863 CouldBeTemporaryObject = false;
3866 case DeclaratorChunk::BlockPointer:
3867 case DeclaratorChunk::MemberPointer:
3868 case DeclaratorChunk::Pipe:
3869 // These cannot appear in expressions.
3870 CouldBeTemporaryObject = false;
3871 StartsWithDeclaratorId = false;
3876 // FIXME: If there is an initializer, assume that this is not intended to be
3877 // a construction of a temporary object.
3879 // Check whether the name has already been declared; if not, this is not a
3880 // function-style cast.
3881 if (CouldBeTemporaryObject) {
3882 LookupResult Result(S, D.getIdentifier(), SourceLocation(),
3883 Sema::LookupOrdinaryName);
3884 if (!S.LookupName(Result, S.getCurScope()))
3885 CouldBeTemporaryObject = false;
3886 Result.suppressDiagnostics();
3889 SourceRange ParenRange(Paren.Loc, Paren.EndLoc);
3891 if (!CouldBeTemporaryObject) {
3892 // If we have A (::B), the parentheses affect the meaning of the program.
3893 // Suppress the warning in that case. Don't bother looking at the DeclSpec
3894 // here: even (e.g.) "int ::x" is visually ambiguous even though it's
3895 // formally unambiguous.
3896 if (StartsWithDeclaratorId && D.getCXXScopeSpec().isValid()) {
3897 for (NestedNameSpecifier *NNS = D.getCXXScopeSpec().getScopeRep(); NNS;
3898 NNS = NNS->getPrefix()) {
3899 if (NNS->getKind() == NestedNameSpecifier::Global)
3904 S.Diag(Paren.Loc, diag::warn_redundant_parens_around_declarator)
3905 << ParenRange << FixItHint::CreateRemoval(Paren.Loc)
3906 << FixItHint::CreateRemoval(Paren.EndLoc);
3910 S.Diag(Paren.Loc, diag::warn_parens_disambiguated_as_variable_declaration)
3911 << ParenRange << D.getIdentifier();
3912 auto *RD = T->getAsCXXRecordDecl();
3913 if (!RD || !RD->hasDefinition() || RD->hasNonTrivialDestructor())
3914 S.Diag(Paren.Loc, diag::note_raii_guard_add_name)
3915 << FixItHint::CreateInsertion(Paren.Loc, " varname") << T
3916 << D.getIdentifier();
3917 // FIXME: A cast to void is probably a better suggestion in cases where it's
3918 // valid (when there is no initializer and we're not in a condition).
3919 S.Diag(D.getBeginLoc(), diag::note_function_style_cast_add_parentheses)
3920 << FixItHint::CreateInsertion(D.getBeginLoc(), "(")
3921 << FixItHint::CreateInsertion(S.getLocForEndOfToken(D.getEndLoc()), ")");
3922 S.Diag(Paren.Loc, diag::note_remove_parens_for_variable_declaration)
3923 << FixItHint::CreateRemoval(Paren.Loc)
3924 << FixItHint::CreateRemoval(Paren.EndLoc);
3927 /// Helper for figuring out the default CC for a function declarator type. If
3928 /// this is the outermost chunk, then we can determine the CC from the
3929 /// declarator context. If not, then this could be either a member function
3930 /// type or normal function type.
3931 static CallingConv getCCForDeclaratorChunk(
3932 Sema &S, Declarator &D, const ParsedAttributesView &AttrList,
3933 const DeclaratorChunk::FunctionTypeInfo &FTI, unsigned ChunkIndex) {
3934 assert(D.getTypeObject(ChunkIndex).Kind == DeclaratorChunk::Function);
3936 // Check for an explicit CC attribute.
3937 for (const ParsedAttr &AL : AttrList) {
3938 switch (AL.getKind()) {
3939 CALLING_CONV_ATTRS_CASELIST : {
3940 // Ignore attributes that don't validate or can't apply to the
3941 // function type. We'll diagnose the failure to apply them in
3942 // handleFunctionTypeAttr.
3944 if (!S.CheckCallingConvAttr(AL, CC) &&
3945 (!FTI.isVariadic || supportsVariadicCall(CC))) {
3956 bool IsCXXInstanceMethod = false;
3958 if (S.getLangOpts().CPlusPlus) {
3959 // Look inwards through parentheses to see if this chunk will form a
3960 // member pointer type or if we're the declarator. Any type attributes
3961 // between here and there will override the CC we choose here.
3962 unsigned I = ChunkIndex;
3963 bool FoundNonParen = false;
3964 while (I && !FoundNonParen) {
3966 if (D.getTypeObject(I).Kind != DeclaratorChunk::Paren)
3967 FoundNonParen = true;
3970 if (FoundNonParen) {
3971 // If we're not the declarator, we're a regular function type unless we're
3972 // in a member pointer.
3973 IsCXXInstanceMethod =
3974 D.getTypeObject(I).Kind == DeclaratorChunk::MemberPointer;
3975 } else if (D.getContext() == DeclaratorContext::LambdaExpr) {
3976 // This can only be a call operator for a lambda, which is an instance
3978 IsCXXInstanceMethod = true;
3980 // We're the innermost decl chunk, so must be a function declarator.
3981 assert(D.isFunctionDeclarator());
3983 // If we're inside a record, we're declaring a method, but it could be
3984 // explicitly or implicitly static.
3985 IsCXXInstanceMethod =
3986 D.isFirstDeclarationOfMember() &&
3987 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef &&
3988 !D.isStaticMember();
3992 CallingConv CC = S.Context.getDefaultCallingConvention(FTI.isVariadic,
3993 IsCXXInstanceMethod);
3995 // Attribute AT_OpenCLKernel affects the calling convention for SPIR
3996 // and AMDGPU targets, hence it cannot be treated as a calling
3997 // convention attribute. This is the simplest place to infer
3998 // calling convention for OpenCL kernels.
3999 if (S.getLangOpts().OpenCL) {
4000 for (const ParsedAttr &AL : D.getDeclSpec().getAttributes()) {
4001 if (AL.getKind() == ParsedAttr::AT_OpenCLKernel) {
4002 CC = CC_OpenCLKernel;
4006 } else if (S.getLangOpts().CUDA) {
4007 // If we're compiling CUDA/HIP code and targeting SPIR-V we need to make
4008 // sure the kernels will be marked with the right calling convention so that
4009 // they will be visible by the APIs that ingest SPIR-V.
4010 llvm::Triple Triple = S.Context.getTargetInfo().getTriple();
4011 if (Triple.getArch() == llvm::Triple::spirv32 ||
4012 Triple.getArch() == llvm::Triple::spirv64) {
4013 for (const ParsedAttr &AL : D.getDeclSpec().getAttributes()) {
4014 if (AL.getKind() == ParsedAttr::AT_CUDAGlobal) {
4015 CC = CC_OpenCLKernel;
4026 /// A simple notion of pointer kinds, which matches up with the various
4027 /// pointer declarators.
4028 enum class SimplePointerKind {
4034 } // end anonymous namespace
4036 IdentifierInfo *Sema::getNullabilityKeyword(NullabilityKind nullability) {
4037 switch (nullability) {
4038 case NullabilityKind::NonNull:
4039 if (!Ident__Nonnull)
4040 Ident__Nonnull = PP.getIdentifierInfo("_Nonnull");
4041 return Ident__Nonnull;
4043 case NullabilityKind::Nullable:
4044 if (!Ident__Nullable)
4045 Ident__Nullable = PP.getIdentifierInfo("_Nullable");
4046 return Ident__Nullable;
4048 case NullabilityKind::NullableResult:
4049 if (!Ident__Nullable_result)
4050 Ident__Nullable_result = PP.getIdentifierInfo("_Nullable_result");
4051 return Ident__Nullable_result;
4053 case NullabilityKind::Unspecified:
4054 if (!Ident__Null_unspecified)
4055 Ident__Null_unspecified = PP.getIdentifierInfo("_Null_unspecified");
4056 return Ident__Null_unspecified;
4058 llvm_unreachable("Unknown nullability kind.");
4061 /// Retrieve the identifier "NSError".
4062 IdentifierInfo *Sema::getNSErrorIdent() {
4064 Ident_NSError = PP.getIdentifierInfo("NSError");
4066 return Ident_NSError;
4069 /// Check whether there is a nullability attribute of any kind in the given
4071 static bool hasNullabilityAttr(const ParsedAttributesView &attrs) {
4072 for (const ParsedAttr &AL : attrs) {
4073 if (AL.getKind() == ParsedAttr::AT_TypeNonNull ||
4074 AL.getKind() == ParsedAttr::AT_TypeNullable ||
4075 AL.getKind() == ParsedAttr::AT_TypeNullableResult ||
4076 AL.getKind() == ParsedAttr::AT_TypeNullUnspecified)
4084 /// Describes the kind of a pointer a declarator describes.
4085 enum class PointerDeclaratorKind {
4088 // Single-level pointer.
4090 // Multi-level pointer (of any pointer kind).
4093 MaybePointerToCFRef,
4097 NSErrorPointerPointer,
4100 /// Describes a declarator chunk wrapping a pointer that marks inference as
4102 // These values must be kept in sync with diagnostics.
4103 enum class PointerWrappingDeclaratorKind {
4104 /// Pointer is top-level.
4106 /// Pointer is an array element.
4108 /// Pointer is the referent type of a C++ reference.
4111 } // end anonymous namespace
4113 /// Classify the given declarator, whose type-specified is \c type, based on
4114 /// what kind of pointer it refers to.
4116 /// This is used to determine the default nullability.
4117 static PointerDeclaratorKind
4118 classifyPointerDeclarator(Sema &S, QualType type, Declarator &declarator,
4119 PointerWrappingDeclaratorKind &wrappingKind) {
4120 unsigned numNormalPointers = 0;
4122 // For any dependent type, we consider it a non-pointer.
4123 if (type->isDependentType())
4124 return PointerDeclaratorKind::NonPointer;
4126 // Look through the declarator chunks to identify pointers.
4127 for (unsigned i = 0, n = declarator.getNumTypeObjects(); i != n; ++i) {
4128 DeclaratorChunk &chunk = declarator.getTypeObject(i);
4129 switch (chunk.Kind) {
4130 case DeclaratorChunk::Array:
4131 if (numNormalPointers == 0)
4132 wrappingKind = PointerWrappingDeclaratorKind::Array;
4135 case DeclaratorChunk::Function:
4136 case DeclaratorChunk::Pipe:
4139 case DeclaratorChunk::BlockPointer:
4140 case DeclaratorChunk::MemberPointer:
4141 return numNormalPointers > 0 ? PointerDeclaratorKind::MultiLevelPointer
4142 : PointerDeclaratorKind::SingleLevelPointer;
4144 case DeclaratorChunk::Paren:
4147 case DeclaratorChunk::Reference:
4148 if (numNormalPointers == 0)
4149 wrappingKind = PointerWrappingDeclaratorKind::Reference;
4152 case DeclaratorChunk::Pointer:
4153 ++numNormalPointers;
4154 if (numNormalPointers > 2)
4155 return PointerDeclaratorKind::MultiLevelPointer;
4160 // Then, dig into the type specifier itself.
4161 unsigned numTypeSpecifierPointers = 0;
4163 // Decompose normal pointers.
4164 if (auto ptrType = type->getAs<PointerType>()) {
4165 ++numNormalPointers;
4167 if (numNormalPointers > 2)
4168 return PointerDeclaratorKind::MultiLevelPointer;
4170 type = ptrType->getPointeeType();
4171 ++numTypeSpecifierPointers;
4175 // Decompose block pointers.
4176 if (type->getAs<BlockPointerType>()) {
4177 return numNormalPointers > 0 ? PointerDeclaratorKind::MultiLevelPointer
4178 : PointerDeclaratorKind::SingleLevelPointer;
4181 // Decompose member pointers.
4182 if (type->getAs<MemberPointerType>()) {
4183 return numNormalPointers > 0 ? PointerDeclaratorKind::MultiLevelPointer
4184 : PointerDeclaratorKind::SingleLevelPointer;
4187 // Look at Objective-C object pointers.
4188 if (auto objcObjectPtr = type->getAs<ObjCObjectPointerType>()) {
4189 ++numNormalPointers;
4190 ++numTypeSpecifierPointers;
4192 // If this is NSError**, report that.
4193 if (auto objcClassDecl = objcObjectPtr->getInterfaceDecl()) {
4194 if (objcClassDecl->getIdentifier() == S.getNSErrorIdent() &&
4195 numNormalPointers == 2 && numTypeSpecifierPointers < 2) {
4196 return PointerDeclaratorKind::NSErrorPointerPointer;
4203 // Look at Objective-C class types.
4204 if (auto objcClass = type->getAs<ObjCInterfaceType>()) {
4205 if (objcClass->getInterface()->getIdentifier() == S.getNSErrorIdent()) {
4206 if (numNormalPointers == 2 && numTypeSpecifierPointers < 2)
4207 return PointerDeclaratorKind::NSErrorPointerPointer;
4213 // If at this point we haven't seen a pointer, we won't see one.
4214 if (numNormalPointers == 0)
4215 return PointerDeclaratorKind::NonPointer;
4217 if (auto recordType = type->getAs<RecordType>()) {
4218 RecordDecl *recordDecl = recordType->getDecl();
4220 // If this is CFErrorRef*, report it as such.
4221 if (numNormalPointers == 2 && numTypeSpecifierPointers < 2 &&
4222 S.isCFError(recordDecl)) {
4223 return PointerDeclaratorKind::CFErrorRefPointer;
4231 switch (numNormalPointers) {
4233 return PointerDeclaratorKind::NonPointer;
4236 return PointerDeclaratorKind::SingleLevelPointer;
4239 return PointerDeclaratorKind::MaybePointerToCFRef;
4242 return PointerDeclaratorKind::MultiLevelPointer;
4246 bool Sema::isCFError(RecordDecl *RD) {
4247 // If we already know about CFError, test it directly.
4249 return CFError == RD;
4251 // Check whether this is CFError, which we identify based on its bridge to
4252 // NSError. CFErrorRef used to be declared with "objc_bridge" but is now
4253 // declared with "objc_bridge_mutable", so look for either one of the two
4255 if (RD->getTagKind() == TTK_Struct) {
4256 IdentifierInfo *bridgedType = nullptr;
4257 if (auto bridgeAttr = RD->getAttr<ObjCBridgeAttr>())
4258 bridgedType = bridgeAttr->getBridgedType();
4259 else if (auto bridgeAttr = RD->getAttr<ObjCBridgeMutableAttr>())
4260 bridgedType = bridgeAttr->getBridgedType();
4262 if (bridgedType == getNSErrorIdent()) {
4271 static FileID getNullabilityCompletenessCheckFileID(Sema &S,
4272 SourceLocation loc) {
4273 // If we're anywhere in a function, method, or closure context, don't perform
4274 // completeness checks.
4275 for (DeclContext *ctx = S.CurContext; ctx; ctx = ctx->getParent()) {
4276 if (ctx->isFunctionOrMethod())
4279 if (ctx->isFileContext())
4283 // We only care about the expansion location.
4284 loc = S.SourceMgr.getExpansionLoc(loc);
4285 FileID file = S.SourceMgr.getFileID(loc);
4286 if (file.isInvalid())
4289 // Retrieve file information.
4290 bool invalid = false;
4291 const SrcMgr::SLocEntry &sloc = S.SourceMgr.getSLocEntry(file, &invalid);
4292 if (invalid || !sloc.isFile())
4295 // We don't want to perform completeness checks on the main file or in
4297 const SrcMgr::FileInfo &fileInfo = sloc.getFile();
4298 if (fileInfo.getIncludeLoc().isInvalid())
4300 if (fileInfo.getFileCharacteristic() != SrcMgr::C_User &&
4301 S.Diags.getSuppressSystemWarnings()) {
4308 /// Creates a fix-it to insert a C-style nullability keyword at \p pointerLoc,
4309 /// taking into account whitespace before and after.
4310 template <typename DiagBuilderT>
4311 static void fixItNullability(Sema &S, DiagBuilderT &Diag,
4312 SourceLocation PointerLoc,
4313 NullabilityKind Nullability) {
4314 assert(PointerLoc.isValid());
4315 if (PointerLoc.isMacroID())
4318 SourceLocation FixItLoc = S.getLocForEndOfToken(PointerLoc);
4319 if (!FixItLoc.isValid() || FixItLoc == PointerLoc)
4322 const char *NextChar = S.SourceMgr.getCharacterData(FixItLoc);
4326 SmallString<32> InsertionTextBuf{" "};
4327 InsertionTextBuf += getNullabilitySpelling(Nullability);
4328 InsertionTextBuf += " ";
4329 StringRef InsertionText = InsertionTextBuf.str();
4331 if (isWhitespace(*NextChar)) {
4332 InsertionText = InsertionText.drop_back();
4333 } else if (NextChar[-1] == '[') {
4334 if (NextChar[0] == ']')
4335 InsertionText = InsertionText.drop_back().drop_front();
4337 InsertionText = InsertionText.drop_front();
4338 } else if (!isAsciiIdentifierContinue(NextChar[0], /*allow dollar*/ true) &&
4339 !isAsciiIdentifierContinue(NextChar[-1], /*allow dollar*/ true)) {
4340 InsertionText = InsertionText.drop_back().drop_front();
4343 Diag << FixItHint::CreateInsertion(FixItLoc, InsertionText);
4346 static void emitNullabilityConsistencyWarning(Sema &S,
4347 SimplePointerKind PointerKind,
4348 SourceLocation PointerLoc,
4349 SourceLocation PointerEndLoc) {
4350 assert(PointerLoc.isValid());
4352 if (PointerKind == SimplePointerKind::Array) {
4353 S.Diag(PointerLoc, diag::warn_nullability_missing_array);
4355 S.Diag(PointerLoc, diag::warn_nullability_missing)
4356 << static_cast<unsigned>(PointerKind);
4359 auto FixItLoc = PointerEndLoc.isValid() ? PointerEndLoc : PointerLoc;
4360 if (FixItLoc.isMacroID())
4363 auto addFixIt = [&](NullabilityKind Nullability) {
4364 auto Diag = S.Diag(FixItLoc, diag::note_nullability_fix_it);
4365 Diag << static_cast<unsigned>(Nullability);
4366 Diag << static_cast<unsigned>(PointerKind);
4367 fixItNullability(S, Diag, FixItLoc, Nullability);
4369 addFixIt(NullabilityKind::Nullable);
4370 addFixIt(NullabilityKind::NonNull);
4373 /// Complains about missing nullability if the file containing \p pointerLoc
4374 /// has other uses of nullability (either the keywords or the \c assume_nonnull
4377 /// If the file has \e not seen other uses of nullability, this particular
4378 /// pointer is saved for possible later diagnosis. See recordNullabilitySeen().
4380 checkNullabilityConsistency(Sema &S, SimplePointerKind pointerKind,
4381 SourceLocation pointerLoc,
4382 SourceLocation pointerEndLoc = SourceLocation()) {
4383 // Determine which file we're performing consistency checking for.
4384 FileID file = getNullabilityCompletenessCheckFileID(S, pointerLoc);
4385 if (file.isInvalid())
4388 // If we haven't seen any type nullability in this file, we won't warn now
4390 FileNullability &fileNullability = S.NullabilityMap[file];
4391 if (!fileNullability.SawTypeNullability) {
4392 // If this is the first pointer declarator in the file, and the appropriate
4393 // warning is on, record it in case we need to diagnose it retroactively.
4394 diag::kind diagKind;
4395 if (pointerKind == SimplePointerKind::Array)
4396 diagKind = diag::warn_nullability_missing_array;
4398 diagKind = diag::warn_nullability_missing;
4400 if (fileNullability.PointerLoc.isInvalid() &&
4401 !S.Context.getDiagnostics().isIgnored(diagKind, pointerLoc)) {
4402 fileNullability.PointerLoc = pointerLoc;
4403 fileNullability.PointerEndLoc = pointerEndLoc;
4404 fileNullability.PointerKind = static_cast<unsigned>(pointerKind);
4410 // Complain about missing nullability.
4411 emitNullabilityConsistencyWarning(S, pointerKind, pointerLoc, pointerEndLoc);
4414 /// Marks that a nullability feature has been used in the file containing
4417 /// If this file already had pointer types in it that were missing nullability,
4418 /// the first such instance is retroactively diagnosed.
4420 /// \sa checkNullabilityConsistency
4421 static void recordNullabilitySeen(Sema &S, SourceLocation loc) {
4422 FileID file = getNullabilityCompletenessCheckFileID(S, loc);
4423 if (file.isInvalid())
4426 FileNullability &fileNullability = S.NullabilityMap[file];
4427 if (fileNullability.SawTypeNullability)
4429 fileNullability.SawTypeNullability = true;
4431 // If we haven't seen any type nullability before, now we have. Retroactively
4432 // diagnose the first unannotated pointer, if there was one.
4433 if (fileNullability.PointerLoc.isInvalid())
4436 auto kind = static_cast<SimplePointerKind>(fileNullability.PointerKind);
4437 emitNullabilityConsistencyWarning(S, kind, fileNullability.PointerLoc,
4438 fileNullability.PointerEndLoc);
4441 /// Returns true if any of the declarator chunks before \p endIndex include a
4442 /// level of indirection: array, pointer, reference, or pointer-to-member.
4444 /// Because declarator chunks are stored in outer-to-inner order, testing
4445 /// every chunk before \p endIndex is testing all chunks that embed the current
4446 /// chunk as part of their type.
4448 /// It is legal to pass the result of Declarator::getNumTypeObjects() as the
4449 /// end index, in which case all chunks are tested.
4450 static bool hasOuterPointerLikeChunk(const Declarator &D, unsigned endIndex) {
4451 unsigned i = endIndex;
4453 // Walk outwards along the declarator chunks.
4455 const DeclaratorChunk &DC = D.getTypeObject(i);
4457 case DeclaratorChunk::Paren:
4459 case DeclaratorChunk::Array:
4460 case DeclaratorChunk::Pointer:
4461 case DeclaratorChunk::Reference:
4462 case DeclaratorChunk::MemberPointer:
4464 case DeclaratorChunk::Function:
4465 case DeclaratorChunk::BlockPointer:
4466 case DeclaratorChunk::Pipe:
4467 // These are invalid anyway, so just ignore.
4474 static bool IsNoDerefableChunk(DeclaratorChunk Chunk) {
4475 return (Chunk.Kind == DeclaratorChunk::Pointer ||
4476 Chunk.Kind == DeclaratorChunk::Array);
4479 template<typename AttrT>
4480 static AttrT *createSimpleAttr(ASTContext &Ctx, ParsedAttr &AL) {
4481 AL.setUsedAsTypeAttr();
4482 return ::new (Ctx) AttrT(Ctx, AL);
4485 static Attr *createNullabilityAttr(ASTContext &Ctx, ParsedAttr &Attr,
4486 NullabilityKind NK) {
4488 case NullabilityKind::NonNull:
4489 return createSimpleAttr<TypeNonNullAttr>(Ctx, Attr);
4491 case NullabilityKind::Nullable:
4492 return createSimpleAttr<TypeNullableAttr>(Ctx, Attr);
4494 case NullabilityKind::NullableResult:
4495 return createSimpleAttr<TypeNullableResultAttr>(Ctx, Attr);
4497 case NullabilityKind::Unspecified:
4498 return createSimpleAttr<TypeNullUnspecifiedAttr>(Ctx, Attr);
4500 llvm_unreachable("unknown NullabilityKind");
4503 // Diagnose whether this is a case with the multiple addr spaces.
4504 // Returns true if this is an invalid case.
4505 // ISO/IEC TR 18037 S5.3 (amending C99 6.7.3): "No type shall be qualified
4506 // by qualifiers for two or more different address spaces."
4507 static bool DiagnoseMultipleAddrSpaceAttributes(Sema &S, LangAS ASOld,
4509 SourceLocation AttrLoc) {
4510 if (ASOld != LangAS::Default) {
4511 if (ASOld != ASNew) {
4512 S.Diag(AttrLoc, diag::err_attribute_address_multiple_qualifiers);
4515 // Emit a warning if they are identical; it's likely unintended.
4517 diag::warn_attribute_address_multiple_identical_qualifiers);
4522 static TypeSourceInfo *GetFullTypeForDeclarator(TypeProcessingState &state,
4523 QualType declSpecType,
4524 TypeSourceInfo *TInfo) {
4525 // The TypeSourceInfo that this function returns will not be a null type.
4526 // If there is an error, this function will fill in a dummy type as fallback.
4527 QualType T = declSpecType;
4528 Declarator &D = state.getDeclarator();
4529 Sema &S = state.getSema();
4530 ASTContext &Context = S.Context;
4531 const LangOptions &LangOpts = S.getLangOpts();
4533 // The name we're declaring, if any.
4534 DeclarationName Name;
4535 if (D.getIdentifier())
4536 Name = D.getIdentifier();
4538 // Does this declaration declare a typedef-name?
4539 bool IsTypedefName =
4540 D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef ||
4541 D.getContext() == DeclaratorContext::AliasDecl ||
4542 D.getContext() == DeclaratorContext::AliasTemplate;
4544 // Does T refer to a function type with a cv-qualifier or a ref-qualifier?
4545 bool IsQualifiedFunction = T->isFunctionProtoType() &&
4546 (!T->castAs<FunctionProtoType>()->getMethodQuals().empty() ||
4547 T->castAs<FunctionProtoType>()->getRefQualifier() != RQ_None);
4549 // If T is 'decltype(auto)', the only declarators we can have are parens
4550 // and at most one function declarator if this is a function declaration.
4551 // If T is a deduced class template specialization type, we can have no
4552 // declarator chunks at all.
4553 if (auto *DT = T->getAs<DeducedType>()) {
4554 const AutoType *AT = T->getAs<AutoType>();
4555 bool IsClassTemplateDeduction = isa<DeducedTemplateSpecializationType>(DT);
4556 if ((AT && AT->isDecltypeAuto()) || IsClassTemplateDeduction) {
4557 for (unsigned I = 0, E = D.getNumTypeObjects(); I != E; ++I) {
4558 unsigned Index = E - I - 1;
4559 DeclaratorChunk &DeclChunk = D.getTypeObject(Index);
4560 unsigned DiagId = IsClassTemplateDeduction
4561 ? diag::err_deduced_class_template_compound_type
4562 : diag::err_decltype_auto_compound_type;
4563 unsigned DiagKind = 0;
4564 switch (DeclChunk.Kind) {
4565 case DeclaratorChunk::Paren:
4566 // FIXME: Rejecting this is a little silly.
4567 if (IsClassTemplateDeduction) {
4572 case DeclaratorChunk::Function: {
4573 if (IsClassTemplateDeduction) {
4578 if (D.isFunctionDeclarationContext() &&
4579 D.isFunctionDeclarator(FnIndex) && FnIndex == Index)
4581 DiagId = diag::err_decltype_auto_function_declarator_not_declaration;
4584 case DeclaratorChunk::Pointer:
4585 case DeclaratorChunk::BlockPointer:
4586 case DeclaratorChunk::MemberPointer:
4589 case DeclaratorChunk::Reference:
4592 case DeclaratorChunk::Array:
4595 case DeclaratorChunk::Pipe:
4599 S.Diag(DeclChunk.Loc, DiagId) << DiagKind;
4600 D.setInvalidType(true);
4606 // Determine whether we should infer _Nonnull on pointer types.
4607 Optional<NullabilityKind> inferNullability;
4608 bool inferNullabilityCS = false;
4609 bool inferNullabilityInnerOnly = false;
4610 bool inferNullabilityInnerOnlyComplete = false;
4612 // Are we in an assume-nonnull region?
4613 bool inAssumeNonNullRegion = false;
4614 SourceLocation assumeNonNullLoc = S.PP.getPragmaAssumeNonNullLoc();
4615 if (assumeNonNullLoc.isValid()) {
4616 inAssumeNonNullRegion = true;
4617 recordNullabilitySeen(S, assumeNonNullLoc);
4620 // Whether to complain about missing nullability specifiers or not.
4624 /// Complain on the inner pointers (but not the outermost
4627 /// Complain about any pointers that don't have nullability
4628 /// specified or inferred.
4630 } complainAboutMissingNullability = CAMN_No;
4631 unsigned NumPointersRemaining = 0;
4632 auto complainAboutInferringWithinChunk = PointerWrappingDeclaratorKind::None;
4634 if (IsTypedefName) {
4635 // For typedefs, we do not infer any nullability (the default),
4636 // and we only complain about missing nullability specifiers on
4638 complainAboutMissingNullability = CAMN_InnerPointers;
4640 if (T->canHaveNullability(/*ResultIfUnknown*/false) &&
4641 !T->getNullability(S.Context)) {
4642 // Note that we allow but don't require nullability on dependent types.
4643 ++NumPointersRemaining;
4646 for (unsigned i = 0, n = D.getNumTypeObjects(); i != n; ++i) {
4647 DeclaratorChunk &chunk = D.getTypeObject(i);
4648 switch (chunk.Kind) {
4649 case DeclaratorChunk::Array:
4650 case DeclaratorChunk::Function:
4651 case DeclaratorChunk::Pipe:
4654 case DeclaratorChunk::BlockPointer:
4655 case DeclaratorChunk::MemberPointer:
4656 ++NumPointersRemaining;
4659 case DeclaratorChunk::Paren:
4660 case DeclaratorChunk::Reference:
4663 case DeclaratorChunk::Pointer:
4664 ++NumPointersRemaining;
4669 bool isFunctionOrMethod = false;
4670 switch (auto context = state.getDeclarator().getContext()) {
4671 case DeclaratorContext::ObjCParameter:
4672 case DeclaratorContext::ObjCResult:
4673 case DeclaratorContext::Prototype:
4674 case DeclaratorContext::TrailingReturn:
4675 case DeclaratorContext::TrailingReturnVar:
4676 isFunctionOrMethod = true;
4679 case DeclaratorContext::Member:
4680 if (state.getDeclarator().isObjCIvar() && !isFunctionOrMethod) {
4681 complainAboutMissingNullability = CAMN_No;
4685 // Weak properties are inferred to be nullable.
4686 if (state.getDeclarator().isObjCWeakProperty() && inAssumeNonNullRegion) {
4687 inferNullability = NullabilityKind::Nullable;
4693 case DeclaratorContext::File:
4694 case DeclaratorContext::KNRTypeList: {
4695 complainAboutMissingNullability = CAMN_Yes;
4697 // Nullability inference depends on the type and declarator.
4698 auto wrappingKind = PointerWrappingDeclaratorKind::None;
4699 switch (classifyPointerDeclarator(S, T, D, wrappingKind)) {
4700 case PointerDeclaratorKind::NonPointer:
4701 case PointerDeclaratorKind::MultiLevelPointer:
4702 // Cannot infer nullability.
4705 case PointerDeclaratorKind::SingleLevelPointer:
4706 // Infer _Nonnull if we are in an assumes-nonnull region.
4707 if (inAssumeNonNullRegion) {
4708 complainAboutInferringWithinChunk = wrappingKind;
4709 inferNullability = NullabilityKind::NonNull;
4710 inferNullabilityCS = (context == DeclaratorContext::ObjCParameter ||
4711 context == DeclaratorContext::ObjCResult);
4715 case PointerDeclaratorKind::CFErrorRefPointer:
4716 case PointerDeclaratorKind::NSErrorPointerPointer:
4717 // Within a function or method signature, infer _Nullable at both
4719 if (isFunctionOrMethod && inAssumeNonNullRegion)
4720 inferNullability = NullabilityKind::Nullable;
4723 case PointerDeclaratorKind::MaybePointerToCFRef:
4724 if (isFunctionOrMethod) {
4725 // On pointer-to-pointer parameters marked cf_returns_retained or
4726 // cf_returns_not_retained, if the outer pointer is explicit then
4727 // infer the inner pointer as _Nullable.
4728 auto hasCFReturnsAttr =
4729 [](const ParsedAttributesView &AttrList) -> bool {
4730 return AttrList.hasAttribute(ParsedAttr::AT_CFReturnsRetained) ||
4731 AttrList.hasAttribute(ParsedAttr::AT_CFReturnsNotRetained);
4733 if (const auto *InnermostChunk = D.getInnermostNonParenChunk()) {
4734 if (hasCFReturnsAttr(D.getDeclarationAttributes()) ||
4735 hasCFReturnsAttr(D.getAttributes()) ||
4736 hasCFReturnsAttr(InnermostChunk->getAttrs()) ||
4737 hasCFReturnsAttr(D.getDeclSpec().getAttributes())) {
4738 inferNullability = NullabilityKind::Nullable;
4739 inferNullabilityInnerOnly = true;
4748 case DeclaratorContext::ConversionId:
4749 complainAboutMissingNullability = CAMN_Yes;
4752 case DeclaratorContext::AliasDecl:
4753 case DeclaratorContext::AliasTemplate:
4754 case DeclaratorContext::Block:
4755 case DeclaratorContext::BlockLiteral:
4756 case DeclaratorContext::Condition:
4757 case DeclaratorContext::CXXCatch:
4758 case DeclaratorContext::CXXNew:
4759 case DeclaratorContext::ForInit:
4760 case DeclaratorContext::SelectionInit:
4761 case DeclaratorContext::LambdaExpr:
4762 case DeclaratorContext::LambdaExprParameter:
4763 case DeclaratorContext::ObjCCatch:
4764 case DeclaratorContext::TemplateParam:
4765 case DeclaratorContext::TemplateArg:
4766 case DeclaratorContext::TemplateTypeArg:
4767 case DeclaratorContext::TypeName:
4768 case DeclaratorContext::FunctionalCast:
4769 case DeclaratorContext::RequiresExpr:
4770 case DeclaratorContext::Association:
4771 // Don't infer in these contexts.
4776 // Local function that returns true if its argument looks like a va_list.
4777 auto isVaList = [&S](QualType T) -> bool {
4778 auto *typedefTy = T->getAs<TypedefType>();
4781 TypedefDecl *vaListTypedef = S.Context.getBuiltinVaListDecl();
4783 if (typedefTy->getDecl() == vaListTypedef)
4785 if (auto *name = typedefTy->getDecl()->getIdentifier())
4786 if (name->isStr("va_list"))
4788 typedefTy = typedefTy->desugar()->getAs<TypedefType>();
4789 } while (typedefTy);
4793 // Local function that checks the nullability for a given pointer declarator.
4794 // Returns true if _Nonnull was inferred.
4795 auto inferPointerNullability =
4796 [&](SimplePointerKind pointerKind, SourceLocation pointerLoc,
4797 SourceLocation pointerEndLoc,
4798 ParsedAttributesView &attrs, AttributePool &Pool) -> ParsedAttr * {
4799 // We've seen a pointer.
4800 if (NumPointersRemaining > 0)
4801 --NumPointersRemaining;
4803 // If a nullability attribute is present, there's nothing to do.
4804 if (hasNullabilityAttr(attrs))
4807 // If we're supposed to infer nullability, do so now.
4808 if (inferNullability && !inferNullabilityInnerOnlyComplete) {
4809 ParsedAttr::Syntax syntax = inferNullabilityCS
4810 ? ParsedAttr::AS_ContextSensitiveKeyword
4811 : ParsedAttr::AS_Keyword;
4812 ParsedAttr *nullabilityAttr = Pool.create(
4813 S.getNullabilityKeyword(*inferNullability), SourceRange(pointerLoc),
4814 nullptr, SourceLocation(), nullptr, 0, syntax);
4816 attrs.addAtEnd(nullabilityAttr);
4818 if (inferNullabilityCS) {
4819 state.getDeclarator().getMutableDeclSpec().getObjCQualifiers()
4820 ->setObjCDeclQualifier(ObjCDeclSpec::DQ_CSNullability);
4823 if (pointerLoc.isValid() &&
4824 complainAboutInferringWithinChunk !=
4825 PointerWrappingDeclaratorKind::None) {
4827 S.Diag(pointerLoc, diag::warn_nullability_inferred_on_nested_type);
4828 Diag << static_cast<int>(complainAboutInferringWithinChunk);
4829 fixItNullability(S, Diag, pointerLoc, NullabilityKind::NonNull);
4832 if (inferNullabilityInnerOnly)
4833 inferNullabilityInnerOnlyComplete = true;
4834 return nullabilityAttr;
4837 // If we're supposed to complain about missing nullability, do so
4838 // now if it's truly missing.
4839 switch (complainAboutMissingNullability) {
4843 case CAMN_InnerPointers:
4844 if (NumPointersRemaining == 0)
4849 checkNullabilityConsistency(S, pointerKind, pointerLoc, pointerEndLoc);
4854 // If the type itself could have nullability but does not, infer pointer
4855 // nullability and perform consistency checking.
4856 if (S.CodeSynthesisContexts.empty()) {
4857 if (T->canHaveNullability(/*ResultIfUnknown*/false) &&
4858 !T->getNullability(S.Context)) {
4860 // Record that we've seen a pointer, but do nothing else.
4861 if (NumPointersRemaining > 0)
4862 --NumPointersRemaining;
4864 SimplePointerKind pointerKind = SimplePointerKind::Pointer;
4865 if (T->isBlockPointerType())
4866 pointerKind = SimplePointerKind::BlockPointer;
4867 else if (T->isMemberPointerType())
4868 pointerKind = SimplePointerKind::MemberPointer;
4870 if (auto *attr = inferPointerNullability(
4871 pointerKind, D.getDeclSpec().getTypeSpecTypeLoc(),
4872 D.getDeclSpec().getEndLoc(),
4873 D.getMutableDeclSpec().getAttributes(),
4874 D.getMutableDeclSpec().getAttributePool())) {
4875 T = state.getAttributedType(
4876 createNullabilityAttr(Context, *attr, *inferNullability), T, T);
4881 if (complainAboutMissingNullability == CAMN_Yes &&
4882 T->isArrayType() && !T->getNullability(S.Context) && !isVaList(T) &&
4883 D.isPrototypeContext() &&
4884 !hasOuterPointerLikeChunk(D, D.getNumTypeObjects())) {
4885 checkNullabilityConsistency(S, SimplePointerKind::Array,
4886 D.getDeclSpec().getTypeSpecTypeLoc());
4890 bool ExpectNoDerefChunk =
4891 state.getCurrentAttributes().hasAttribute(ParsedAttr::AT_NoDeref);
4893 // Walk the DeclTypeInfo, building the recursive type as we go.
4894 // DeclTypeInfos are ordered from the identifier out, which is
4895 // opposite of what we want :).
4896 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) {
4897 unsigned chunkIndex = e - i - 1;
4898 state.setCurrentChunkIndex(chunkIndex);
4899 DeclaratorChunk &DeclType = D.getTypeObject(chunkIndex);
4900 IsQualifiedFunction &= DeclType.Kind == DeclaratorChunk::Paren;
4901 switch (DeclType.Kind) {
4902 case DeclaratorChunk::Paren:
4904 warnAboutRedundantParens(S, D, T);
4905 T = S.BuildParenType(T);
4907 case DeclaratorChunk::BlockPointer:
4908 // If blocks are disabled, emit an error.
4909 if (!LangOpts.Blocks)
4910 S.Diag(DeclType.Loc, diag::err_blocks_disable) << LangOpts.OpenCL;
4912 // Handle pointer nullability.
4913 inferPointerNullability(SimplePointerKind::BlockPointer, DeclType.Loc,
4914 DeclType.EndLoc, DeclType.getAttrs(),
4915 state.getDeclarator().getAttributePool());
4917 T = S.BuildBlockPointerType(T, D.getIdentifierLoc(), Name);
4918 if (DeclType.Cls.TypeQuals || LangOpts.OpenCL) {
4919 // OpenCL v2.0, s6.12.5 - Block variable declarations are implicitly
4920 // qualified with const.
4921 if (LangOpts.OpenCL)
4922 DeclType.Cls.TypeQuals |= DeclSpec::TQ_const;
4923 T = S.BuildQualifiedType(T, DeclType.Loc, DeclType.Cls.TypeQuals);
4926 case DeclaratorChunk::Pointer:
4927 // Verify that we're not building a pointer to pointer to function with
4928 // exception specification.
4929 if (LangOpts.CPlusPlus && S.CheckDistantExceptionSpec(T)) {
4930 S.Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec);
4931 D.setInvalidType(true);
4932 // Build the type anyway.
4935 // Handle pointer nullability
4936 inferPointerNullability(SimplePointerKind::Pointer, DeclType.Loc,
4937 DeclType.EndLoc, DeclType.getAttrs(),
4938 state.getDeclarator().getAttributePool());
4940 if (LangOpts.ObjC && T->getAs<ObjCObjectType>()) {
4941 T = Context.getObjCObjectPointerType(T);
4942 if (DeclType.Ptr.TypeQuals)
4943 T = S.BuildQualifiedType(T, DeclType.Loc, DeclType.Ptr.TypeQuals);
4947 // OpenCL v2.0 s6.9b - Pointer to image/sampler cannot be used.
4948 // OpenCL v2.0 s6.13.16.1 - Pointer to pipe cannot be used.
4949 // OpenCL v2.0 s6.12.5 - Pointers to Blocks are not allowed.
4950 if (LangOpts.OpenCL) {
4951 if (T->isImageType() || T->isSamplerT() || T->isPipeType() ||
4952 T->isBlockPointerType()) {
4953 S.Diag(D.getIdentifierLoc(), diag::err_opencl_pointer_to_type) << T;
4954 D.setInvalidType(true);
4958 T = S.BuildPointerType(T, DeclType.Loc, Name);
4959 if (DeclType.Ptr.TypeQuals)
4960 T = S.BuildQualifiedType(T, DeclType.Loc, DeclType.Ptr.TypeQuals);
4962 case DeclaratorChunk::Reference: {
4963 // Verify that we're not building a reference to pointer to function with
4964 // exception specification.
4965 if (LangOpts.CPlusPlus && S.CheckDistantExceptionSpec(T)) {
4966 S.Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec);
4967 D.setInvalidType(true);
4968 // Build the type anyway.
4970 T = S.BuildReferenceType(T, DeclType.Ref.LValueRef, DeclType.Loc, Name);
4972 if (DeclType.Ref.HasRestrict)
4973 T = S.BuildQualifiedType(T, DeclType.Loc, Qualifiers::Restrict);
4976 case DeclaratorChunk::Array: {
4977 // Verify that we're not building an array of pointers to function with
4978 // exception specification.
4979 if (LangOpts.CPlusPlus && S.CheckDistantExceptionSpec(T)) {
4980 S.Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec);
4981 D.setInvalidType(true);
4982 // Build the type anyway.
4984 DeclaratorChunk::ArrayTypeInfo &ATI = DeclType.Arr;
4985 Expr *ArraySize = static_cast<Expr*>(ATI.NumElts);
4986 ArrayType::ArraySizeModifier ASM;
4988 ASM = ArrayType::Star;
4989 else if (ATI.hasStatic)
4990 ASM = ArrayType::Static;
4992 ASM = ArrayType::Normal;
4993 if (ASM == ArrayType::Star && !D.isPrototypeContext()) {
4994 // FIXME: This check isn't quite right: it allows star in prototypes
4995 // for function definitions, and disallows some edge cases detailed
4996 // in http://gcc.gnu.org/ml/gcc-patches/2009-02/msg00133.html
4997 S.Diag(DeclType.Loc, diag::err_array_star_outside_prototype);
4998 ASM = ArrayType::Normal;
4999 D.setInvalidType(true);
5002 // C99 6.7.5.2p1: The optional type qualifiers and the keyword static
5003 // shall appear only in a declaration of a function parameter with an
5005 if (ASM == ArrayType::Static || ATI.TypeQuals) {
5006 if (!(D.isPrototypeContext() ||
5007 D.getContext() == DeclaratorContext::KNRTypeList)) {
5008 S.Diag(DeclType.Loc, diag::err_array_static_outside_prototype) <<
5009 (ASM == ArrayType::Static ? "'static'" : "type qualifier");
5010 // Remove the 'static' and the type qualifiers.
5011 if (ASM == ArrayType::Static)
5012 ASM = ArrayType::Normal;
5014 D.setInvalidType(true);
5017 // C99 6.7.5.2p1: ... and then only in the outermost array type
5019 if (hasOuterPointerLikeChunk(D, chunkIndex)) {
5020 S.Diag(DeclType.Loc, diag::err_array_static_not_outermost) <<
5021 (ASM == ArrayType::Static ? "'static'" : "type qualifier");
5022 if (ASM == ArrayType::Static)
5023 ASM = ArrayType::Normal;
5025 D.setInvalidType(true);
5028 const AutoType *AT = T->getContainedAutoType();
5029 // Allow arrays of auto if we are a generic lambda parameter.
5030 // i.e. [](auto (&array)[5]) { return array[0]; }; OK
5031 if (AT && D.getContext() != DeclaratorContext::LambdaExprParameter) {
5032 // We've already diagnosed this for decltype(auto).
5033 if (!AT->isDecltypeAuto())
5034 S.Diag(DeclType.Loc, diag::err_illegal_decl_array_of_auto)
5035 << getPrintableNameForEntity(Name) << T;
5040 // Array parameters can be marked nullable as well, although it's not
5041 // necessary if they're marked 'static'.
5042 if (complainAboutMissingNullability == CAMN_Yes &&
5043 !hasNullabilityAttr(DeclType.getAttrs()) &&
5044 ASM != ArrayType::Static &&
5045 D.isPrototypeContext() &&
5046 !hasOuterPointerLikeChunk(D, chunkIndex)) {
5047 checkNullabilityConsistency(S, SimplePointerKind::Array, DeclType.Loc);
5050 T = S.BuildArrayType(T, ASM, ArraySize, ATI.TypeQuals,
5051 SourceRange(DeclType.Loc, DeclType.EndLoc), Name);
5054 case DeclaratorChunk::Function: {
5055 // If the function declarator has a prototype (i.e. it is not () and
5056 // does not have a K&R-style identifier list), then the arguments are part
5057 // of the type, otherwise the argument list is ().
5058 DeclaratorChunk::FunctionTypeInfo &FTI = DeclType.Fun;
5059 IsQualifiedFunction =
5060 FTI.hasMethodTypeQualifiers() || FTI.hasRefQualifier();
5062 // Check for auto functions and trailing return type and adjust the
5063 // return type accordingly.
5064 if (!D.isInvalidType()) {
5065 // trailing-return-type is only required if we're declaring a function,
5066 // and not, for instance, a pointer to a function.
5067 if (D.getDeclSpec().hasAutoTypeSpec() &&
5068 !FTI.hasTrailingReturnType() && chunkIndex == 0) {
5069 if (!S.getLangOpts().CPlusPlus14) {
5070 S.Diag(D.getDeclSpec().getTypeSpecTypeLoc(),
5071 D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_auto
5072 ? diag::err_auto_missing_trailing_return
5073 : diag::err_deduced_return_type);
5075 D.setInvalidType(true);
5077 S.Diag(D.getDeclSpec().getTypeSpecTypeLoc(),
5078 diag::warn_cxx11_compat_deduced_return_type);
5080 } else if (FTI.hasTrailingReturnType()) {
5081 // T must be exactly 'auto' at this point. See CWG issue 681.
5082 if (isa<ParenType>(T)) {
5083 S.Diag(D.getBeginLoc(), diag::err_trailing_return_in_parens)
5084 << T << D.getSourceRange();
5085 D.setInvalidType(true);
5086 } else if (D.getName().getKind() ==
5087 UnqualifiedIdKind::IK_DeductionGuideName) {
5088 if (T != Context.DependentTy) {
5089 S.Diag(D.getDeclSpec().getBeginLoc(),
5090 diag::err_deduction_guide_with_complex_decl)
5091 << D.getSourceRange();
5092 D.setInvalidType(true);
5094 } else if (D.getContext() != DeclaratorContext::LambdaExpr &&
5095 (T.hasQualifiers() || !isa<AutoType>(T) ||
5096 cast<AutoType>(T)->getKeyword() !=
5097 AutoTypeKeyword::Auto ||
5098 cast<AutoType>(T)->isConstrained())) {
5099 S.Diag(D.getDeclSpec().getTypeSpecTypeLoc(),
5100 diag::err_trailing_return_without_auto)
5101 << T << D.getDeclSpec().getSourceRange();
5102 D.setInvalidType(true);
5104 T = S.GetTypeFromParser(FTI.getTrailingReturnType(), &TInfo);
5106 // An error occurred parsing the trailing return type.
5108 D.setInvalidType(true);
5109 } else if (AutoType *Auto = T->getContainedAutoType()) {
5110 // If the trailing return type contains an `auto`, we may need to
5111 // invent a template parameter for it, for cases like
5112 // `auto f() -> C auto` or `[](auto (*p) -> auto) {}`.
5113 InventedTemplateParameterInfo *InventedParamInfo = nullptr;
5114 if (D.getContext() == DeclaratorContext::Prototype)
5115 InventedParamInfo = &S.InventedParameterInfos.back();
5116 else if (D.getContext() == DeclaratorContext::LambdaExprParameter)
5117 InventedParamInfo = S.getCurLambda();
5118 if (InventedParamInfo) {
5119 std::tie(T, TInfo) = InventTemplateParameter(
5120 state, T, TInfo, Auto, *InventedParamInfo);
5124 // This function type is not the type of the entity being declared,
5125 // so checking the 'auto' is not the responsibility of this chunk.
5129 // C99 6.7.5.3p1: The return type may not be a function or array type.
5130 // For conversion functions, we'll diagnose this particular error later.
5131 if (!D.isInvalidType() && (T->isArrayType() || T->isFunctionType()) &&
5132 (D.getName().getKind() !=
5133 UnqualifiedIdKind::IK_ConversionFunctionId)) {
5134 unsigned diagID = diag::err_func_returning_array_function;
5135 // Last processing chunk in block context means this function chunk
5136 // represents the block.
5137 if (chunkIndex == 0 &&
5138 D.getContext() == DeclaratorContext::BlockLiteral)
5139 diagID = diag::err_block_returning_array_function;
5140 S.Diag(DeclType.Loc, diagID) << T->isFunctionType() << T;
5142 D.setInvalidType(true);
5145 // Do not allow returning half FP value.
5146 // FIXME: This really should be in BuildFunctionType.
5147 if (T->isHalfType()) {
5148 if (S.getLangOpts().OpenCL) {
5149 if (!S.getOpenCLOptions().isAvailableOption("cl_khr_fp16",
5151 S.Diag(D.getIdentifierLoc(), diag::err_opencl_invalid_return)
5152 << T << 0 /*pointer hint*/;
5153 D.setInvalidType(true);
5155 } else if (!S.getLangOpts().HalfArgsAndReturns) {
5156 S.Diag(D.getIdentifierLoc(),
5157 diag::err_parameters_retval_cannot_have_fp16_type) << 1;
5158 D.setInvalidType(true);
5162 if (LangOpts.OpenCL) {
5163 // OpenCL v2.0 s6.12.5 - A block cannot be the return value of a
5165 if (T->isBlockPointerType() || T->isImageType() || T->isSamplerT() ||
5167 S.Diag(D.getIdentifierLoc(), diag::err_opencl_invalid_return)
5168 << T << 1 /*hint off*/;
5169 D.setInvalidType(true);
5171 // OpenCL doesn't support variadic functions and blocks
5172 // (s6.9.e and s6.12.5 OpenCL v2.0) except for printf.
5173 // We also allow here any toolchain reserved identifiers.
5174 if (FTI.isVariadic &&
5175 !S.getOpenCLOptions().isAvailableOption(
5176 "__cl_clang_variadic_functions", S.getLangOpts()) &&
5177 !(D.getIdentifier() &&
5178 ((D.getIdentifier()->getName() == "printf" &&
5179 LangOpts.getOpenCLCompatibleVersion() >= 120) ||
5180 D.getIdentifier()->getName().startswith("__")))) {
5181 S.Diag(D.getIdentifierLoc(), diag::err_opencl_variadic_function);
5182 D.setInvalidType(true);
5186 // Methods cannot return interface types. All ObjC objects are
5187 // passed by reference.
5188 if (T->isObjCObjectType()) {
5189 SourceLocation DiagLoc, FixitLoc;
5191 DiagLoc = TInfo->getTypeLoc().getBeginLoc();
5192 FixitLoc = S.getLocForEndOfToken(TInfo->getTypeLoc().getEndLoc());
5194 DiagLoc = D.getDeclSpec().getTypeSpecTypeLoc();
5195 FixitLoc = S.getLocForEndOfToken(D.getDeclSpec().getEndLoc());
5197 S.Diag(DiagLoc, diag::err_object_cannot_be_passed_returned_by_value)
5199 << FixItHint::CreateInsertion(FixitLoc, "*");
5201 T = Context.getObjCObjectPointerType(T);
5204 TLB.pushFullCopy(TInfo->getTypeLoc());
5205 ObjCObjectPointerTypeLoc TLoc = TLB.push<ObjCObjectPointerTypeLoc>(T);
5206 TLoc.setStarLoc(FixitLoc);
5207 TInfo = TLB.getTypeSourceInfo(Context, T);
5210 D.setInvalidType(true);
5213 // cv-qualifiers on return types are pointless except when the type is a
5214 // class type in C++.
5215 if ((T.getCVRQualifiers() || T->isAtomicType()) &&
5216 !(S.getLangOpts().CPlusPlus &&
5217 (T->isDependentType() || T->isRecordType()))) {
5218 if (T->isVoidType() && !S.getLangOpts().CPlusPlus &&
5219 D.getFunctionDefinitionKind() ==
5220 FunctionDefinitionKind::Definition) {
5221 // [6.9.1/3] qualified void return is invalid on a C
5222 // function definition. Apparently ok on declarations and
5223 // in C++ though (!)
5224 S.Diag(DeclType.Loc, diag::err_func_returning_qualified_void) << T;
5226 diagnoseRedundantReturnTypeQualifiers(S, T, D, chunkIndex);
5228 // C++2a [dcl.fct]p12:
5229 // A volatile-qualified return type is deprecated
5230 if (T.isVolatileQualified() && S.getLangOpts().CPlusPlus20)
5231 S.Diag(DeclType.Loc, diag::warn_deprecated_volatile_return) << T;
5234 // Objective-C ARC ownership qualifiers are ignored on the function
5235 // return type (by type canonicalization). Complain if this attribute
5236 // was written here.
5237 if (T.getQualifiers().hasObjCLifetime()) {
5238 SourceLocation AttrLoc;
5239 if (chunkIndex + 1 < D.getNumTypeObjects()) {
5240 DeclaratorChunk ReturnTypeChunk = D.getTypeObject(chunkIndex + 1);
5241 for (const ParsedAttr &AL : ReturnTypeChunk.getAttrs()) {
5242 if (AL.getKind() == ParsedAttr::AT_ObjCOwnership) {
5243 AttrLoc = AL.getLoc();
5248 if (AttrLoc.isInvalid()) {
5249 for (const ParsedAttr &AL : D.getDeclSpec().getAttributes()) {
5250 if (AL.getKind() == ParsedAttr::AT_ObjCOwnership) {
5251 AttrLoc = AL.getLoc();
5257 if (AttrLoc.isValid()) {
5258 // The ownership attributes are almost always written via
5260 // __strong/__weak/__autoreleasing/__unsafe_unretained.
5261 if (AttrLoc.isMacroID())
5263 S.SourceMgr.getImmediateExpansionRange(AttrLoc).getBegin();
5265 S.Diag(AttrLoc, diag::warn_arc_lifetime_result_type)
5266 << T.getQualifiers().getObjCLifetime();
5270 if (LangOpts.CPlusPlus && D.getDeclSpec().hasTagDefinition()) {
5272 // Types shall not be defined in return or parameter types.
5273 TagDecl *Tag = cast<TagDecl>(D.getDeclSpec().getRepAsDecl());
5274 S.Diag(Tag->getLocation(), diag::err_type_defined_in_result_type)
5275 << Context.getTypeDeclType(Tag);
5278 // Exception specs are not allowed in typedefs. Complain, but add it
5280 if (IsTypedefName && FTI.getExceptionSpecType() && !LangOpts.CPlusPlus17)
5281 S.Diag(FTI.getExceptionSpecLocBeg(),
5282 diag::err_exception_spec_in_typedef)
5283 << (D.getContext() == DeclaratorContext::AliasDecl ||
5284 D.getContext() == DeclaratorContext::AliasTemplate);
5286 // If we see "T var();" or "T var(T());" at block scope, it is probably
5287 // an attempt to initialize a variable, not a function declaration.
5288 if (FTI.isAmbiguous)
5289 warnAboutAmbiguousFunction(S, D, DeclType, T);
5291 FunctionType::ExtInfo EI(
5292 getCCForDeclaratorChunk(S, D, DeclType.getAttrs(), FTI, chunkIndex));
5294 // OpenCL disallows functions without a prototype, but it doesn't enforce
5295 // strict prototypes as in C2x because it allows a function definition to
5296 // have an identifier list. See OpenCL 3.0 6.11/g for more details.
5297 if (!FTI.NumParams && !FTI.isVariadic &&
5298 !LangOpts.requiresStrictPrototypes() && !LangOpts.OpenCL) {
5299 // Simple void foo(), where the incoming T is the result type.
5300 T = Context.getFunctionNoProtoType(T, EI);
5302 // We allow a zero-parameter variadic function in C if the
5303 // function is marked with the "overloadable" attribute. Scan
5304 // for this attribute now.
5305 if (!FTI.NumParams && FTI.isVariadic && !LangOpts.CPlusPlus)
5306 if (!D.getDeclarationAttributes().hasAttribute(
5307 ParsedAttr::AT_Overloadable) &&
5308 !D.getAttributes().hasAttribute(ParsedAttr::AT_Overloadable) &&
5309 !D.getDeclSpec().getAttributes().hasAttribute(
5310 ParsedAttr::AT_Overloadable))
5311 S.Diag(FTI.getEllipsisLoc(), diag::err_ellipsis_first_param);
5313 if (FTI.NumParams && FTI.Params[0].Param == nullptr) {
5314 // C99 6.7.5.3p3: Reject int(x,y,z) when it's not a function
5316 S.Diag(FTI.Params[0].IdentLoc,
5317 diag::err_ident_list_in_fn_declaration);
5318 D.setInvalidType(true);
5319 // Recover by creating a K&R-style function type, if possible.
5320 T = (!LangOpts.requiresStrictPrototypes() && !LangOpts.OpenCL)
5321 ? Context.getFunctionNoProtoType(T, EI)
5326 FunctionProtoType::ExtProtoInfo EPI;
5328 EPI.Variadic = FTI.isVariadic;
5329 EPI.EllipsisLoc = FTI.getEllipsisLoc();
5330 EPI.HasTrailingReturn = FTI.hasTrailingReturnType();
5331 EPI.TypeQuals.addCVRUQualifiers(
5332 FTI.MethodQualifiers ? FTI.MethodQualifiers->getTypeQualifiers()
5334 EPI.RefQualifier = !FTI.hasRefQualifier()? RQ_None
5335 : FTI.RefQualifierIsLValueRef? RQ_LValue
5338 // Otherwise, we have a function with a parameter list that is
5339 // potentially variadic.
5340 SmallVector<QualType, 16> ParamTys;
5341 ParamTys.reserve(FTI.NumParams);
5343 SmallVector<FunctionProtoType::ExtParameterInfo, 16>
5344 ExtParameterInfos(FTI.NumParams);
5345 bool HasAnyInterestingExtParameterInfos = false;
5347 for (unsigned i = 0, e = FTI.NumParams; i != e; ++i) {
5348 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.Params[i].Param);
5349 QualType ParamTy = Param->getType();
5350 assert(!ParamTy.isNull() && "Couldn't parse type?");
5352 // Look for 'void'. void is allowed only as a single parameter to a
5353 // function with no other parameters (C99 6.7.5.3p10). We record
5354 // int(void) as a FunctionProtoType with an empty parameter list.
5355 if (ParamTy->isVoidType()) {
5356 // If this is something like 'float(int, void)', reject it. 'void'
5357 // is an incomplete type (C99 6.2.5p19) and function decls cannot
5358 // have parameters of incomplete type.
5359 if (FTI.NumParams != 1 || FTI.isVariadic) {
5360 S.Diag(FTI.Params[i].IdentLoc, diag::err_void_only_param);
5361 ParamTy = Context.IntTy;
5362 Param->setType(ParamTy);
5363 } else if (FTI.Params[i].Ident) {
5364 // Reject, but continue to parse 'int(void abc)'.
5365 S.Diag(FTI.Params[i].IdentLoc, diag::err_param_with_void_type);
5366 ParamTy = Context.IntTy;
5367 Param->setType(ParamTy);
5369 // Reject, but continue to parse 'float(const void)'.
5370 if (ParamTy.hasQualifiers())
5371 S.Diag(DeclType.Loc, diag::err_void_param_qualified);
5373 // Do not add 'void' to the list.
5376 } else if (ParamTy->isHalfType()) {
5377 // Disallow half FP parameters.
5378 // FIXME: This really should be in BuildFunctionType.
5379 if (S.getLangOpts().OpenCL) {
5380 if (!S.getOpenCLOptions().isAvailableOption("cl_khr_fp16",
5382 S.Diag(Param->getLocation(), diag::err_opencl_invalid_param)
5385 Param->setInvalidDecl();
5387 } else if (!S.getLangOpts().HalfArgsAndReturns) {
5388 S.Diag(Param->getLocation(),
5389 diag::err_parameters_retval_cannot_have_fp16_type) << 0;
5392 } else if (!FTI.hasPrototype) {
5393 if (ParamTy->isPromotableIntegerType()) {
5394 ParamTy = Context.getPromotedIntegerType(ParamTy);
5395 Param->setKNRPromoted(true);
5396 } else if (const BuiltinType* BTy = ParamTy->getAs<BuiltinType>()) {
5397 if (BTy->getKind() == BuiltinType::Float) {
5398 ParamTy = Context.DoubleTy;
5399 Param->setKNRPromoted(true);
5402 } else if (S.getLangOpts().OpenCL && ParamTy->isBlockPointerType()) {
5403 // OpenCL 2.0 s6.12.5: A block cannot be a parameter of a function.
5404 S.Diag(Param->getLocation(), diag::err_opencl_invalid_param)
5405 << ParamTy << 1 /*hint off*/;
5409 if (LangOpts.ObjCAutoRefCount && Param->hasAttr<NSConsumedAttr>()) {
5410 ExtParameterInfos[i] = ExtParameterInfos[i].withIsConsumed(true);
5411 HasAnyInterestingExtParameterInfos = true;
5414 if (auto attr = Param->getAttr<ParameterABIAttr>()) {
5415 ExtParameterInfos[i] =
5416 ExtParameterInfos[i].withABI(attr->getABI());
5417 HasAnyInterestingExtParameterInfos = true;
5420 if (Param->hasAttr<PassObjectSizeAttr>()) {
5421 ExtParameterInfos[i] = ExtParameterInfos[i].withHasPassObjectSize();
5422 HasAnyInterestingExtParameterInfos = true;
5425 if (Param->hasAttr<NoEscapeAttr>()) {
5426 ExtParameterInfos[i] = ExtParameterInfos[i].withIsNoEscape(true);
5427 HasAnyInterestingExtParameterInfos = true;
5430 ParamTys.push_back(ParamTy);
5433 if (HasAnyInterestingExtParameterInfos) {
5434 EPI.ExtParameterInfos = ExtParameterInfos.data();
5435 checkExtParameterInfos(S, ParamTys, EPI,
5436 [&](unsigned i) { return FTI.Params[i].Param->getLocation(); });
5439 SmallVector<QualType, 4> Exceptions;
5440 SmallVector<ParsedType, 2> DynamicExceptions;
5441 SmallVector<SourceRange, 2> DynamicExceptionRanges;
5442 Expr *NoexceptExpr = nullptr;
5444 if (FTI.getExceptionSpecType() == EST_Dynamic) {
5445 // FIXME: It's rather inefficient to have to split into two vectors
5447 unsigned N = FTI.getNumExceptions();
5448 DynamicExceptions.reserve(N);
5449 DynamicExceptionRanges.reserve(N);
5450 for (unsigned I = 0; I != N; ++I) {
5451 DynamicExceptions.push_back(FTI.Exceptions[I].Ty);
5452 DynamicExceptionRanges.push_back(FTI.Exceptions[I].Range);
5454 } else if (isComputedNoexcept(FTI.getExceptionSpecType())) {
5455 NoexceptExpr = FTI.NoexceptExpr;
5458 S.checkExceptionSpecification(D.isFunctionDeclarationContext(),
5459 FTI.getExceptionSpecType(),
5461 DynamicExceptionRanges,
5466 // FIXME: Set address space from attrs for C++ mode here.
5467 // OpenCLCPlusPlus: A class member function has an address space.
5468 auto IsClassMember = [&]() {
5469 return (!state.getDeclarator().getCXXScopeSpec().isEmpty() &&
5470 state.getDeclarator()
5473 ->getKind() == NestedNameSpecifier::TypeSpec) ||
5474 state.getDeclarator().getContext() ==
5475 DeclaratorContext::Member ||
5476 state.getDeclarator().getContext() ==
5477 DeclaratorContext::LambdaExpr;
5480 if (state.getSema().getLangOpts().OpenCLCPlusPlus && IsClassMember()) {
5481 LangAS ASIdx = LangAS::Default;
5482 // Take address space attr if any and mark as invalid to avoid adding
5483 // them later while creating QualType.
5484 if (FTI.MethodQualifiers)
5485 for (ParsedAttr &attr : FTI.MethodQualifiers->getAttributes()) {
5486 LangAS ASIdxNew = attr.asOpenCLLangAS();
5487 if (DiagnoseMultipleAddrSpaceAttributes(S, ASIdx, ASIdxNew,
5489 D.setInvalidType(true);
5493 // If a class member function's address space is not set, set it to
5496 (ASIdx == LangAS::Default ? S.getDefaultCXXMethodAddrSpace()
5498 EPI.TypeQuals.addAddressSpace(AS);
5500 T = Context.getFunctionType(T, ParamTys, EPI);
5504 case DeclaratorChunk::MemberPointer: {
5505 // The scope spec must refer to a class, or be dependent.
5506 CXXScopeSpec &SS = DeclType.Mem.Scope();
5509 // Handle pointer nullability.
5510 inferPointerNullability(SimplePointerKind::MemberPointer, DeclType.Loc,
5511 DeclType.EndLoc, DeclType.getAttrs(),
5512 state.getDeclarator().getAttributePool());
5514 if (SS.isInvalid()) {
5515 // Avoid emitting extra errors if we already errored on the scope.
5516 D.setInvalidType(true);
5517 } else if (S.isDependentScopeSpecifier(SS) ||
5518 isa_and_nonnull<CXXRecordDecl>(S.computeDeclContext(SS))) {
5519 NestedNameSpecifier *NNS = SS.getScopeRep();
5520 NestedNameSpecifier *NNSPrefix = NNS->getPrefix();
5521 switch (NNS->getKind()) {
5522 case NestedNameSpecifier::Identifier:
5523 ClsType = Context.getDependentNameType(ETK_None, NNSPrefix,
5524 NNS->getAsIdentifier());
5527 case NestedNameSpecifier::Namespace:
5528 case NestedNameSpecifier::NamespaceAlias:
5529 case NestedNameSpecifier::Global:
5530 case NestedNameSpecifier::Super:
5531 llvm_unreachable("Nested-name-specifier must name a type");
5533 case NestedNameSpecifier::TypeSpec:
5534 case NestedNameSpecifier::TypeSpecWithTemplate:
5535 ClsType = QualType(NNS->getAsType(), 0);
5536 // Note: if the NNS has a prefix and ClsType is a nondependent
5537 // TemplateSpecializationType, then the NNS prefix is NOT included
5538 // in ClsType; hence we wrap ClsType into an ElaboratedType.
5539 // NOTE: in particular, no wrap occurs if ClsType already is an
5540 // Elaborated, DependentName, or DependentTemplateSpecialization.
5541 if (NNSPrefix && isa<TemplateSpecializationType>(NNS->getAsType()))
5542 ClsType = Context.getElaboratedType(ETK_None, NNSPrefix, ClsType);
5546 S.Diag(DeclType.Mem.Scope().getBeginLoc(),
5547 diag::err_illegal_decl_mempointer_in_nonclass)
5548 << (D.getIdentifier() ? D.getIdentifier()->getName() : "type name")
5549 << DeclType.Mem.Scope().getRange();
5550 D.setInvalidType(true);
5553 if (!ClsType.isNull())
5554 T = S.BuildMemberPointerType(T, ClsType, DeclType.Loc,
5558 D.setInvalidType(true);
5559 } else if (DeclType.Mem.TypeQuals) {
5560 T = S.BuildQualifiedType(T, DeclType.Loc, DeclType.Mem.TypeQuals);
5565 case DeclaratorChunk::Pipe: {
5566 T = S.BuildReadPipeType(T, DeclType.Loc);
5567 processTypeAttrs(state, T, TAL_DeclSpec,
5568 D.getMutableDeclSpec().getAttributes());
5574 D.setInvalidType(true);
5578 // See if there are any attributes on this declarator chunk.
5579 processTypeAttrs(state, T, TAL_DeclChunk, DeclType.getAttrs());
5581 if (DeclType.Kind != DeclaratorChunk::Paren) {
5582 if (ExpectNoDerefChunk && !IsNoDerefableChunk(DeclType))
5583 S.Diag(DeclType.Loc, diag::warn_noderef_on_non_pointer_or_array);
5585 ExpectNoDerefChunk = state.didParseNoDeref();
5589 if (ExpectNoDerefChunk)
5590 S.Diag(state.getDeclarator().getBeginLoc(),
5591 diag::warn_noderef_on_non_pointer_or_array);
5593 // GNU warning -Wstrict-prototypes
5594 // Warn if a function declaration or definition is without a prototype.
5595 // This warning is issued for all kinds of unprototyped function
5596 // declarations (i.e. function type typedef, function pointer etc.)
5598 // The empty list in a function declarator that is not part of a definition
5599 // of that function specifies that no information about the number or types
5600 // of the parameters is supplied.
5601 // See ActOnFinishFunctionBody() and MergeFunctionDecl() for handling of
5602 // function declarations whose behavior changes in C2x.
5603 if (!LangOpts.requiresStrictPrototypes()) {
5604 bool IsBlock = false;
5605 for (const DeclaratorChunk &DeclType : D.type_objects()) {
5606 switch (DeclType.Kind) {
5607 case DeclaratorChunk::BlockPointer:
5610 case DeclaratorChunk::Function: {
5611 const DeclaratorChunk::FunctionTypeInfo &FTI = DeclType.Fun;
5612 // We suppress the warning when there's no LParen location, as this
5613 // indicates the declaration was an implicit declaration, which gets
5614 // warned about separately via -Wimplicit-function-declaration. We also
5615 // suppress the warning when we know the function has a prototype.
5616 if (!FTI.hasPrototype && FTI.NumParams == 0 && !FTI.isVariadic &&
5617 FTI.getLParenLoc().isValid())
5618 S.Diag(DeclType.Loc, diag::warn_strict_prototypes)
5620 << FixItHint::CreateInsertion(FTI.getRParenLoc(), "void");
5630 assert(!T.isNull() && "T must not be null after this point");
5632 if (LangOpts.CPlusPlus && T->isFunctionType()) {
5633 const FunctionProtoType *FnTy = T->getAs<FunctionProtoType>();
5634 assert(FnTy && "Why oh why is there not a FunctionProtoType here?");
5637 // A cv-qualifier-seq shall only be part of the function type
5638 // for a nonstatic member function, the function type to which a pointer
5639 // to member refers, or the top-level function type of a function typedef
5642 // Core issue 547 also allows cv-qualifiers on function types that are
5643 // top-level template type arguments.
5644 enum { NonMember, Member, DeductionGuide } Kind = NonMember;
5645 if (D.getName().getKind() == UnqualifiedIdKind::IK_DeductionGuideName)
5646 Kind = DeductionGuide;
5647 else if (!D.getCXXScopeSpec().isSet()) {
5648 if ((D.getContext() == DeclaratorContext::Member ||
5649 D.getContext() == DeclaratorContext::LambdaExpr) &&
5650 !D.getDeclSpec().isFriendSpecified())
5653 DeclContext *DC = S.computeDeclContext(D.getCXXScopeSpec());
5654 if (!DC || DC->isRecord())
5658 // C++11 [dcl.fct]p6 (w/DR1417):
5659 // An attempt to specify a function type with a cv-qualifier-seq or a
5660 // ref-qualifier (including by typedef-name) is ill-formed unless it is:
5661 // - the function type for a non-static member function,
5662 // - the function type to which a pointer to member refers,
5663 // - the top-level function type of a function typedef declaration or
5664 // alias-declaration,
5665 // - the type-id in the default argument of a type-parameter, or
5666 // - the type-id of a template-argument for a type-parameter
5668 // FIXME: Checking this here is insufficient. We accept-invalid on:
5670 // template<typename T> struct S { void f(T); };
5671 // S<int() const> s;
5673 // ... for instance.
5674 if (IsQualifiedFunction &&
5676 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) &&
5677 !IsTypedefName && D.getContext() != DeclaratorContext::TemplateArg &&
5678 D.getContext() != DeclaratorContext::TemplateTypeArg) {
5679 SourceLocation Loc = D.getBeginLoc();
5680 SourceRange RemovalRange;
5682 if (D.isFunctionDeclarator(I)) {
5683 SmallVector<SourceLocation, 4> RemovalLocs;
5684 const DeclaratorChunk &Chunk = D.getTypeObject(I);
5685 assert(Chunk.Kind == DeclaratorChunk::Function);
5687 if (Chunk.Fun.hasRefQualifier())
5688 RemovalLocs.push_back(Chunk.Fun.getRefQualifierLoc());
5690 if (Chunk.Fun.hasMethodTypeQualifiers())
5691 Chunk.Fun.MethodQualifiers->forEachQualifier(
5692 [&](DeclSpec::TQ TypeQual, StringRef QualName,
5693 SourceLocation SL) { RemovalLocs.push_back(SL); });
5695 if (!RemovalLocs.empty()) {
5696 llvm::sort(RemovalLocs,
5697 BeforeThanCompare<SourceLocation>(S.getSourceManager()));
5698 RemovalRange = SourceRange(RemovalLocs.front(), RemovalLocs.back());
5699 Loc = RemovalLocs.front();
5703 S.Diag(Loc, diag::err_invalid_qualified_function_type)
5704 << Kind << D.isFunctionDeclarator() << T
5705 << getFunctionQualifiersAsString(FnTy)
5706 << FixItHint::CreateRemoval(RemovalRange);
5708 // Strip the cv-qualifiers and ref-qualifiers from the type.
5709 FunctionProtoType::ExtProtoInfo EPI = FnTy->getExtProtoInfo();
5710 EPI.TypeQuals.removeCVRQualifiers();
5711 EPI.RefQualifier = RQ_None;
5713 T = Context.getFunctionType(FnTy->getReturnType(), FnTy->getParamTypes(),
5715 // Rebuild any parens around the identifier in the function type.
5716 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) {
5717 if (D.getTypeObject(i).Kind != DeclaratorChunk::Paren)
5719 T = S.BuildParenType(T);
5724 // Apply any undistributed attributes from the declaration or declarator.
5725 ParsedAttributesView NonSlidingAttrs;
5726 for (ParsedAttr &AL : D.getDeclarationAttributes()) {
5727 if (!AL.slidesFromDeclToDeclSpecLegacyBehavior()) {
5728 NonSlidingAttrs.addAtEnd(&AL);
5731 processTypeAttrs(state, T, TAL_DeclName, NonSlidingAttrs);
5732 processTypeAttrs(state, T, TAL_DeclName, D.getAttributes());
5734 // Diagnose any ignored type attributes.
5735 state.diagnoseIgnoredTypeAttrs(T);
5737 // C++0x [dcl.constexpr]p9:
5738 // A constexpr specifier used in an object declaration declares the object
5740 if (D.getDeclSpec().getConstexprSpecifier() == ConstexprSpecKind::Constexpr &&
5744 // C++2a [dcl.fct]p4:
5745 // A parameter with volatile-qualified type is deprecated
5746 if (T.isVolatileQualified() && S.getLangOpts().CPlusPlus20 &&
5747 (D.getContext() == DeclaratorContext::Prototype ||
5748 D.getContext() == DeclaratorContext::LambdaExprParameter))
5749 S.Diag(D.getIdentifierLoc(), diag::warn_deprecated_volatile_param) << T;
5751 // If there was an ellipsis in the declarator, the declaration declares a
5752 // parameter pack whose type may be a pack expansion type.
5753 if (D.hasEllipsis()) {
5754 // C++0x [dcl.fct]p13:
5755 // A declarator-id or abstract-declarator containing an ellipsis shall
5756 // only be used in a parameter-declaration. Such a parameter-declaration
5757 // is a parameter pack (14.5.3). [...]
5758 switch (D.getContext()) {
5759 case DeclaratorContext::Prototype:
5760 case DeclaratorContext::LambdaExprParameter:
5761 case DeclaratorContext::RequiresExpr:
5762 // C++0x [dcl.fct]p13:
5763 // [...] When it is part of a parameter-declaration-clause, the
5764 // parameter pack is a function parameter pack (14.5.3). The type T
5765 // of the declarator-id of the function parameter pack shall contain
5766 // a template parameter pack; each template parameter pack in T is
5767 // expanded by the function parameter pack.
5769 // We represent function parameter packs as function parameters whose
5770 // type is a pack expansion.
5771 if (!T->containsUnexpandedParameterPack() &&
5772 (!LangOpts.CPlusPlus20 || !T->getContainedAutoType())) {
5773 S.Diag(D.getEllipsisLoc(),
5774 diag::err_function_parameter_pack_without_parameter_packs)
5775 << T << D.getSourceRange();
5776 D.setEllipsisLoc(SourceLocation());
5778 T = Context.getPackExpansionType(T, None, /*ExpectPackInType=*/false);
5781 case DeclaratorContext::TemplateParam:
5782 // C++0x [temp.param]p15:
5783 // If a template-parameter is a [...] is a parameter-declaration that
5784 // declares a parameter pack (8.3.5), then the template-parameter is a
5785 // template parameter pack (14.5.3).
5787 // Note: core issue 778 clarifies that, if there are any unexpanded
5788 // parameter packs in the type of the non-type template parameter, then
5789 // it expands those parameter packs.
5790 if (T->containsUnexpandedParameterPack())
5791 T = Context.getPackExpansionType(T, None);
5793 S.Diag(D.getEllipsisLoc(),
5794 LangOpts.CPlusPlus11
5795 ? diag::warn_cxx98_compat_variadic_templates
5796 : diag::ext_variadic_templates);
5799 case DeclaratorContext::File:
5800 case DeclaratorContext::KNRTypeList:
5801 case DeclaratorContext::ObjCParameter: // FIXME: special diagnostic here?
5802 case DeclaratorContext::ObjCResult: // FIXME: special diagnostic here?
5803 case DeclaratorContext::TypeName:
5804 case DeclaratorContext::FunctionalCast:
5805 case DeclaratorContext::CXXNew:
5806 case DeclaratorContext::AliasDecl:
5807 case DeclaratorContext::AliasTemplate:
5808 case DeclaratorContext::Member:
5809 case DeclaratorContext::Block:
5810 case DeclaratorContext::ForInit:
5811 case DeclaratorContext::SelectionInit:
5812 case DeclaratorContext::Condition:
5813 case DeclaratorContext::CXXCatch:
5814 case DeclaratorContext::ObjCCatch:
5815 case DeclaratorContext::BlockLiteral:
5816 case DeclaratorContext::LambdaExpr:
5817 case DeclaratorContext::ConversionId:
5818 case DeclaratorContext::TrailingReturn:
5819 case DeclaratorContext::TrailingReturnVar:
5820 case DeclaratorContext::TemplateArg:
5821 case DeclaratorContext::TemplateTypeArg:
5822 case DeclaratorContext::Association:
5823 // FIXME: We may want to allow parameter packs in block-literal contexts
5825 S.Diag(D.getEllipsisLoc(),
5826 diag::err_ellipsis_in_declarator_not_parameter);
5827 D.setEllipsisLoc(SourceLocation());
5832 assert(!T.isNull() && "T must not be null at the end of this function");
5833 if (D.isInvalidType())
5834 return Context.getTrivialTypeSourceInfo(T);
5836 return GetTypeSourceInfoForDeclarator(state, T, TInfo);
5839 /// GetTypeForDeclarator - Convert the type for the specified
5840 /// declarator to Type instances.
5842 /// The result of this call will never be null, but the associated
5843 /// type may be a null type if there's an unrecoverable error.
5844 TypeSourceInfo *Sema::GetTypeForDeclarator(Declarator &D, Scope *S) {
5845 // Determine the type of the declarator. Not all forms of declarator
5848 TypeProcessingState state(*this, D);
5850 TypeSourceInfo *ReturnTypeInfo = nullptr;
5851 QualType T = GetDeclSpecTypeForDeclarator(state, ReturnTypeInfo);
5852 if (D.isPrototypeContext() && getLangOpts().ObjCAutoRefCount)
5853 inferARCWriteback(state, T);
5855 return GetFullTypeForDeclarator(state, T, ReturnTypeInfo);
5858 static void transferARCOwnershipToDeclSpec(Sema &S,
5859 QualType &declSpecTy,
5860 Qualifiers::ObjCLifetime ownership) {
5861 if (declSpecTy->isObjCRetainableType() &&
5862 declSpecTy.getObjCLifetime() == Qualifiers::OCL_None) {
5864 qs.addObjCLifetime(ownership);
5865 declSpecTy = S.Context.getQualifiedType(declSpecTy, qs);
5869 static void transferARCOwnershipToDeclaratorChunk(TypeProcessingState &state,
5870 Qualifiers::ObjCLifetime ownership,
5871 unsigned chunkIndex) {
5872 Sema &S = state.getSema();
5873 Declarator &D = state.getDeclarator();
5875 // Look for an explicit lifetime attribute.
5876 DeclaratorChunk &chunk = D.getTypeObject(chunkIndex);
5877 if (chunk.getAttrs().hasAttribute(ParsedAttr::AT_ObjCOwnership))
5880 const char *attrStr = nullptr;
5881 switch (ownership) {
5882 case Qualifiers::OCL_None: llvm_unreachable("no ownership!");
5883 case Qualifiers::OCL_ExplicitNone: attrStr = "none"; break;
5884 case Qualifiers::OCL_Strong: attrStr = "strong"; break;
5885 case Qualifiers::OCL_Weak: attrStr = "weak"; break;
5886 case Qualifiers::OCL_Autoreleasing: attrStr = "autoreleasing"; break;
5889 IdentifierLoc *Arg = new (S.Context) IdentifierLoc;
5890 Arg->Ident = &S.Context.Idents.get(attrStr);
5891 Arg->Loc = SourceLocation();
5893 ArgsUnion Args(Arg);
5895 // If there wasn't one, add one (with an invalid source location
5896 // so that we don't make an AttributedType for it).
5897 ParsedAttr *attr = D.getAttributePool().create(
5898 &S.Context.Idents.get("objc_ownership"), SourceLocation(),
5899 /*scope*/ nullptr, SourceLocation(),
5900 /*args*/ &Args, 1, ParsedAttr::AS_GNU);
5901 chunk.getAttrs().addAtEnd(attr);
5902 // TODO: mark whether we did this inference?
5905 /// Used for transferring ownership in casts resulting in l-values.
5906 static void transferARCOwnership(TypeProcessingState &state,
5907 QualType &declSpecTy,
5908 Qualifiers::ObjCLifetime ownership) {
5909 Sema &S = state.getSema();
5910 Declarator &D = state.getDeclarator();
5913 bool hasIndirection = false;
5914 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) {
5915 DeclaratorChunk &chunk = D.getTypeObject(i);
5916 switch (chunk.Kind) {
5917 case DeclaratorChunk::Paren:
5921 case DeclaratorChunk::Array:
5922 case DeclaratorChunk::Reference:
5923 case DeclaratorChunk::Pointer:
5925 hasIndirection = true;
5929 case DeclaratorChunk::BlockPointer:
5931 transferARCOwnershipToDeclaratorChunk(state, ownership, i);
5934 case DeclaratorChunk::Function:
5935 case DeclaratorChunk::MemberPointer:
5936 case DeclaratorChunk::Pipe:
5944 DeclaratorChunk &chunk = D.getTypeObject(inner);
5945 if (chunk.Kind == DeclaratorChunk::Pointer) {
5946 if (declSpecTy->isObjCRetainableType())
5947 return transferARCOwnershipToDeclSpec(S, declSpecTy, ownership);
5948 if (declSpecTy->isObjCObjectType() && hasIndirection)
5949 return transferARCOwnershipToDeclaratorChunk(state, ownership, inner);
5951 assert(chunk.Kind == DeclaratorChunk::Array ||
5952 chunk.Kind == DeclaratorChunk::Reference);
5953 return transferARCOwnershipToDeclSpec(S, declSpecTy, ownership);
5957 TypeSourceInfo *Sema::GetTypeForDeclaratorCast(Declarator &D, QualType FromTy) {
5958 TypeProcessingState state(*this, D);
5960 TypeSourceInfo *ReturnTypeInfo = nullptr;
5961 QualType declSpecTy = GetDeclSpecTypeForDeclarator(state, ReturnTypeInfo);
5963 if (getLangOpts().ObjC) {
5964 Qualifiers::ObjCLifetime ownership = Context.getInnerObjCOwnership(FromTy);
5965 if (ownership != Qualifiers::OCL_None)
5966 transferARCOwnership(state, declSpecTy, ownership);
5969 return GetFullTypeForDeclarator(state, declSpecTy, ReturnTypeInfo);
5972 static void fillAttributedTypeLoc(AttributedTypeLoc TL,
5973 TypeProcessingState &State) {
5974 TL.setAttr(State.takeAttrForAttributedType(TL.getTypePtr()));
5978 class TypeSpecLocFiller : public TypeLocVisitor<TypeSpecLocFiller> {
5980 ASTContext &Context;
5981 TypeProcessingState &State;
5985 TypeSpecLocFiller(Sema &S, ASTContext &Context, TypeProcessingState &State,
5987 : SemaRef(S), Context(Context), State(State), DS(DS) {}
5989 void VisitAttributedTypeLoc(AttributedTypeLoc TL) {
5990 Visit(TL.getModifiedLoc());
5991 fillAttributedTypeLoc(TL, State);
5993 void VisitBTFTagAttributedTypeLoc(BTFTagAttributedTypeLoc TL) {
5994 Visit(TL.getWrappedLoc());
5996 void VisitMacroQualifiedTypeLoc(MacroQualifiedTypeLoc TL) {
5997 Visit(TL.getInnerLoc());
5999 State.getExpansionLocForMacroQualifiedType(TL.getTypePtr()));
6001 void VisitQualifiedTypeLoc(QualifiedTypeLoc TL) {
6002 Visit(TL.getUnqualifiedLoc());
6004 // Allow to fill pointee's type locations, e.g.,
6005 // int __attr * __attr * __attr *p;
6006 void VisitPointerTypeLoc(PointerTypeLoc TL) { Visit(TL.getNextTypeLoc()); }
6007 void VisitTypedefTypeLoc(TypedefTypeLoc TL) {
6008 TL.setNameLoc(DS.getTypeSpecTypeLoc());
6010 void VisitObjCInterfaceTypeLoc(ObjCInterfaceTypeLoc TL) {
6011 TL.setNameLoc(DS.getTypeSpecTypeLoc());
6012 // FIXME. We should have DS.getTypeSpecTypeEndLoc(). But, it requires
6013 // addition field. What we have is good enough for display of location
6014 // of 'fixit' on interface name.
6015 TL.setNameEndLoc(DS.getEndLoc());
6017 void VisitObjCObjectTypeLoc(ObjCObjectTypeLoc TL) {
6018 TypeSourceInfo *RepTInfo = nullptr;
6019 Sema::GetTypeFromParser(DS.getRepAsType(), &RepTInfo);
6020 TL.copy(RepTInfo->getTypeLoc());
6022 void VisitObjCObjectPointerTypeLoc(ObjCObjectPointerTypeLoc TL) {
6023 TypeSourceInfo *RepTInfo = nullptr;
6024 Sema::GetTypeFromParser(DS.getRepAsType(), &RepTInfo);
6025 TL.copy(RepTInfo->getTypeLoc());
6027 void VisitTemplateSpecializationTypeLoc(TemplateSpecializationTypeLoc TL) {
6028 TypeSourceInfo *TInfo = nullptr;
6029 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo);
6031 // If we got no declarator info from previous Sema routines,
6032 // just fill with the typespec loc.
6034 TL.initialize(Context, DS.getTypeSpecTypeNameLoc());
6038 TypeLoc OldTL = TInfo->getTypeLoc();
6039 if (TInfo->getType()->getAs<ElaboratedType>()) {
6040 ElaboratedTypeLoc ElabTL = OldTL.castAs<ElaboratedTypeLoc>();
6041 TemplateSpecializationTypeLoc NamedTL = ElabTL.getNamedTypeLoc()
6042 .castAs<TemplateSpecializationTypeLoc>();
6045 TL.copy(OldTL.castAs<TemplateSpecializationTypeLoc>());
6046 assert(TL.getRAngleLoc() == OldTL.castAs<TemplateSpecializationTypeLoc>().getRAngleLoc());
6050 void VisitTypeOfExprTypeLoc(TypeOfExprTypeLoc TL) {
6051 assert(DS.getTypeSpecType() == DeclSpec::TST_typeofExpr);
6052 TL.setTypeofLoc(DS.getTypeSpecTypeLoc());
6053 TL.setParensRange(DS.getTypeofParensRange());
6055 void VisitTypeOfTypeLoc(TypeOfTypeLoc TL) {
6056 assert(DS.getTypeSpecType() == DeclSpec::TST_typeofType);
6057 TL.setTypeofLoc(DS.getTypeSpecTypeLoc());
6058 TL.setParensRange(DS.getTypeofParensRange());
6059 assert(DS.getRepAsType());
6060 TypeSourceInfo *TInfo = nullptr;
6061 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo);
6062 TL.setUnderlyingTInfo(TInfo);
6064 void VisitDecltypeTypeLoc(DecltypeTypeLoc TL) {
6065 assert(DS.getTypeSpecType() == DeclSpec::TST_decltype);
6066 TL.setDecltypeLoc(DS.getTypeSpecTypeLoc());
6067 TL.setRParenLoc(DS.getTypeofParensRange().getEnd());
6069 void VisitUnaryTransformTypeLoc(UnaryTransformTypeLoc TL) {
6070 // FIXME: This holds only because we only have one unary transform.
6071 assert(DS.getTypeSpecType() == DeclSpec::TST_underlyingType);
6072 TL.setKWLoc(DS.getTypeSpecTypeLoc());
6073 TL.setParensRange(DS.getTypeofParensRange());
6074 assert(DS.getRepAsType());
6075 TypeSourceInfo *TInfo = nullptr;
6076 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo);
6077 TL.setUnderlyingTInfo(TInfo);
6079 void VisitBuiltinTypeLoc(BuiltinTypeLoc TL) {
6080 // By default, use the source location of the type specifier.
6081 TL.setBuiltinLoc(DS.getTypeSpecTypeLoc());
6082 if (TL.needsExtraLocalData()) {
6083 // Set info for the written builtin specifiers.
6084 TL.getWrittenBuiltinSpecs() = DS.getWrittenBuiltinSpecs();
6085 // Try to have a meaningful source location.
6086 if (TL.getWrittenSignSpec() != TypeSpecifierSign::Unspecified)
6087 TL.expandBuiltinRange(DS.getTypeSpecSignLoc());
6088 if (TL.getWrittenWidthSpec() != TypeSpecifierWidth::Unspecified)
6089 TL.expandBuiltinRange(DS.getTypeSpecWidthRange());
6092 void VisitElaboratedTypeLoc(ElaboratedTypeLoc TL) {
6093 ElaboratedTypeKeyword Keyword
6094 = TypeWithKeyword::getKeywordForTypeSpec(DS.getTypeSpecType());
6095 if (DS.getTypeSpecType() == TST_typename) {
6096 TypeSourceInfo *TInfo = nullptr;
6097 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo);
6099 TL.copy(TInfo->getTypeLoc().castAs<ElaboratedTypeLoc>());
6103 TL.setElaboratedKeywordLoc(Keyword != ETK_None
6104 ? DS.getTypeSpecTypeLoc()
6105 : SourceLocation());
6106 const CXXScopeSpec& SS = DS.getTypeSpecScope();
6107 TL.setQualifierLoc(SS.getWithLocInContext(Context));
6108 Visit(TL.getNextTypeLoc().getUnqualifiedLoc());
6110 void VisitDependentNameTypeLoc(DependentNameTypeLoc TL) {
6111 assert(DS.getTypeSpecType() == TST_typename);
6112 TypeSourceInfo *TInfo = nullptr;
6113 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo);
6115 TL.copy(TInfo->getTypeLoc().castAs<DependentNameTypeLoc>());
6117 void VisitDependentTemplateSpecializationTypeLoc(
6118 DependentTemplateSpecializationTypeLoc TL) {
6119 assert(DS.getTypeSpecType() == TST_typename);
6120 TypeSourceInfo *TInfo = nullptr;
6121 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo);
6124 TInfo->getTypeLoc().castAs<DependentTemplateSpecializationTypeLoc>());
6126 void VisitAutoTypeLoc(AutoTypeLoc TL) {
6127 assert(DS.getTypeSpecType() == TST_auto ||
6128 DS.getTypeSpecType() == TST_decltype_auto ||
6129 DS.getTypeSpecType() == TST_auto_type ||
6130 DS.getTypeSpecType() == TST_unspecified);
6131 TL.setNameLoc(DS.getTypeSpecTypeLoc());
6132 if (DS.getTypeSpecType() == TST_decltype_auto)
6133 TL.setRParenLoc(DS.getTypeofParensRange().getEnd());
6134 if (!DS.isConstrainedAuto())
6136 TemplateIdAnnotation *TemplateId = DS.getRepAsTemplateId();
6139 if (DS.getTypeSpecScope().isNotEmpty())
6140 TL.setNestedNameSpecifierLoc(
6141 DS.getTypeSpecScope().getWithLocInContext(Context));
6143 TL.setNestedNameSpecifierLoc(NestedNameSpecifierLoc());
6144 TL.setTemplateKWLoc(TemplateId->TemplateKWLoc);
6145 TL.setConceptNameLoc(TemplateId->TemplateNameLoc);
6146 TL.setFoundDecl(nullptr);
6147 TL.setLAngleLoc(TemplateId->LAngleLoc);
6148 TL.setRAngleLoc(TemplateId->RAngleLoc);
6149 if (TemplateId->NumArgs == 0)
6151 TemplateArgumentListInfo TemplateArgsInfo;
6152 ASTTemplateArgsPtr TemplateArgsPtr(TemplateId->getTemplateArgs(),
6153 TemplateId->NumArgs);
6154 SemaRef.translateTemplateArguments(TemplateArgsPtr, TemplateArgsInfo);
6155 for (unsigned I = 0; I < TemplateId->NumArgs; ++I)
6156 TL.setArgLocInfo(I, TemplateArgsInfo.arguments()[I].getLocInfo());
6158 void VisitTagTypeLoc(TagTypeLoc TL) {
6159 TL.setNameLoc(DS.getTypeSpecTypeNameLoc());
6161 void VisitAtomicTypeLoc(AtomicTypeLoc TL) {
6162 // An AtomicTypeLoc can come from either an _Atomic(...) type specifier
6163 // or an _Atomic qualifier.
6164 if (DS.getTypeSpecType() == DeclSpec::TST_atomic) {
6165 TL.setKWLoc(DS.getTypeSpecTypeLoc());
6166 TL.setParensRange(DS.getTypeofParensRange());
6168 TypeSourceInfo *TInfo = nullptr;
6169 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo);
6171 TL.getValueLoc().initializeFullCopy(TInfo->getTypeLoc());
6173 TL.setKWLoc(DS.getAtomicSpecLoc());
6174 // No parens, to indicate this was spelled as an _Atomic qualifier.
6175 TL.setParensRange(SourceRange());
6176 Visit(TL.getValueLoc());
6180 void VisitPipeTypeLoc(PipeTypeLoc TL) {
6181 TL.setKWLoc(DS.getTypeSpecTypeLoc());
6183 TypeSourceInfo *TInfo = nullptr;
6184 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo);
6185 TL.getValueLoc().initializeFullCopy(TInfo->getTypeLoc());
6188 void VisitExtIntTypeLoc(BitIntTypeLoc TL) {
6189 TL.setNameLoc(DS.getTypeSpecTypeLoc());
6192 void VisitDependentExtIntTypeLoc(DependentBitIntTypeLoc TL) {
6193 TL.setNameLoc(DS.getTypeSpecTypeLoc());
6196 void VisitTypeLoc(TypeLoc TL) {
6197 // FIXME: add other typespec types and change this to an assert.
6198 TL.initialize(Context, DS.getTypeSpecTypeLoc());
6202 class DeclaratorLocFiller : public TypeLocVisitor<DeclaratorLocFiller> {
6203 ASTContext &Context;
6204 TypeProcessingState &State;
6205 const DeclaratorChunk &Chunk;
6208 DeclaratorLocFiller(ASTContext &Context, TypeProcessingState &State,
6209 const DeclaratorChunk &Chunk)
6210 : Context(Context), State(State), Chunk(Chunk) {}
6212 void VisitQualifiedTypeLoc(QualifiedTypeLoc TL) {
6213 llvm_unreachable("qualified type locs not expected here!");
6215 void VisitDecayedTypeLoc(DecayedTypeLoc TL) {
6216 llvm_unreachable("decayed type locs not expected here!");
6219 void VisitAttributedTypeLoc(AttributedTypeLoc TL) {
6220 fillAttributedTypeLoc(TL, State);
6222 void VisitBTFTagAttributedTypeLoc(BTFTagAttributedTypeLoc TL) {
6225 void VisitAdjustedTypeLoc(AdjustedTypeLoc TL) {
6228 void VisitBlockPointerTypeLoc(BlockPointerTypeLoc TL) {
6229 assert(Chunk.Kind == DeclaratorChunk::BlockPointer);
6230 TL.setCaretLoc(Chunk.Loc);
6232 void VisitPointerTypeLoc(PointerTypeLoc TL) {
6233 assert(Chunk.Kind == DeclaratorChunk::Pointer);
6234 TL.setStarLoc(Chunk.Loc);
6236 void VisitObjCObjectPointerTypeLoc(ObjCObjectPointerTypeLoc TL) {
6237 assert(Chunk.Kind == DeclaratorChunk::Pointer);
6238 TL.setStarLoc(Chunk.Loc);
6240 void VisitMemberPointerTypeLoc(MemberPointerTypeLoc TL) {
6241 assert(Chunk.Kind == DeclaratorChunk::MemberPointer);
6242 const CXXScopeSpec& SS = Chunk.Mem.Scope();
6243 NestedNameSpecifierLoc NNSLoc = SS.getWithLocInContext(Context);
6245 const Type* ClsTy = TL.getClass();
6246 QualType ClsQT = QualType(ClsTy, 0);
6247 TypeSourceInfo *ClsTInfo = Context.CreateTypeSourceInfo(ClsQT, 0);
6248 // Now copy source location info into the type loc component.
6249 TypeLoc ClsTL = ClsTInfo->getTypeLoc();
6250 switch (NNSLoc.getNestedNameSpecifier()->getKind()) {
6251 case NestedNameSpecifier::Identifier:
6252 assert(isa<DependentNameType>(ClsTy) && "Unexpected TypeLoc");
6254 DependentNameTypeLoc DNTLoc = ClsTL.castAs<DependentNameTypeLoc>();
6255 DNTLoc.setElaboratedKeywordLoc(SourceLocation());
6256 DNTLoc.setQualifierLoc(NNSLoc.getPrefix());
6257 DNTLoc.setNameLoc(NNSLoc.getLocalBeginLoc());
6261 case NestedNameSpecifier::TypeSpec:
6262 case NestedNameSpecifier::TypeSpecWithTemplate:
6263 if (isa<ElaboratedType>(ClsTy)) {
6264 ElaboratedTypeLoc ETLoc = ClsTL.castAs<ElaboratedTypeLoc>();
6265 ETLoc.setElaboratedKeywordLoc(SourceLocation());
6266 ETLoc.setQualifierLoc(NNSLoc.getPrefix());
6267 TypeLoc NamedTL = ETLoc.getNamedTypeLoc();
6268 NamedTL.initializeFullCopy(NNSLoc.getTypeLoc());
6270 ClsTL.initializeFullCopy(NNSLoc.getTypeLoc());
6274 case NestedNameSpecifier::Namespace:
6275 case NestedNameSpecifier::NamespaceAlias:
6276 case NestedNameSpecifier::Global:
6277 case NestedNameSpecifier::Super:
6278 llvm_unreachable("Nested-name-specifier must name a type");
6281 // Finally fill in MemberPointerLocInfo fields.
6282 TL.setStarLoc(Chunk.Mem.StarLoc);
6283 TL.setClassTInfo(ClsTInfo);
6285 void VisitLValueReferenceTypeLoc(LValueReferenceTypeLoc TL) {
6286 assert(Chunk.Kind == DeclaratorChunk::Reference);
6287 // 'Amp' is misleading: this might have been originally
6288 /// spelled with AmpAmp.
6289 TL.setAmpLoc(Chunk.Loc);
6291 void VisitRValueReferenceTypeLoc(RValueReferenceTypeLoc TL) {
6292 assert(Chunk.Kind == DeclaratorChunk::Reference);
6293 assert(!Chunk.Ref.LValueRef);
6294 TL.setAmpAmpLoc(Chunk.Loc);
6296 void VisitArrayTypeLoc(ArrayTypeLoc TL) {
6297 assert(Chunk.Kind == DeclaratorChunk::Array);
6298 TL.setLBracketLoc(Chunk.Loc);
6299 TL.setRBracketLoc(Chunk.EndLoc);
6300 TL.setSizeExpr(static_cast<Expr*>(Chunk.Arr.NumElts));
6302 void VisitFunctionTypeLoc(FunctionTypeLoc TL) {
6303 assert(Chunk.Kind == DeclaratorChunk::Function);
6304 TL.setLocalRangeBegin(Chunk.Loc);
6305 TL.setLocalRangeEnd(Chunk.EndLoc);
6307 const DeclaratorChunk::FunctionTypeInfo &FTI = Chunk.Fun;
6308 TL.setLParenLoc(FTI.getLParenLoc());
6309 TL.setRParenLoc(FTI.getRParenLoc());
6310 for (unsigned i = 0, e = TL.getNumParams(), tpi = 0; i != e; ++i) {
6311 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.Params[i].Param);
6312 TL.setParam(tpi++, Param);
6314 TL.setExceptionSpecRange(FTI.getExceptionSpecRange());
6316 void VisitParenTypeLoc(ParenTypeLoc TL) {
6317 assert(Chunk.Kind == DeclaratorChunk::Paren);
6318 TL.setLParenLoc(Chunk.Loc);
6319 TL.setRParenLoc(Chunk.EndLoc);
6321 void VisitPipeTypeLoc(PipeTypeLoc TL) {
6322 assert(Chunk.Kind == DeclaratorChunk::Pipe);
6323 TL.setKWLoc(Chunk.Loc);
6325 void VisitBitIntTypeLoc(BitIntTypeLoc TL) {
6326 TL.setNameLoc(Chunk.Loc);
6328 void VisitMacroQualifiedTypeLoc(MacroQualifiedTypeLoc TL) {
6329 TL.setExpansionLoc(Chunk.Loc);
6331 void VisitVectorTypeLoc(VectorTypeLoc TL) { TL.setNameLoc(Chunk.Loc); }
6332 void VisitDependentVectorTypeLoc(DependentVectorTypeLoc TL) {
6333 TL.setNameLoc(Chunk.Loc);
6335 void VisitExtVectorTypeLoc(ExtVectorTypeLoc TL) {
6336 TL.setNameLoc(Chunk.Loc);
6339 VisitDependentSizedExtVectorTypeLoc(DependentSizedExtVectorTypeLoc TL) {
6340 TL.setNameLoc(Chunk.Loc);
6343 void VisitTypeLoc(TypeLoc TL) {
6344 llvm_unreachable("unsupported TypeLoc kind in declarator!");
6347 } // end anonymous namespace
6349 static void fillAtomicQualLoc(AtomicTypeLoc ATL, const DeclaratorChunk &Chunk) {
6351 switch (Chunk.Kind) {
6352 case DeclaratorChunk::Function:
6353 case DeclaratorChunk::Array:
6354 case DeclaratorChunk::Paren:
6355 case DeclaratorChunk::Pipe:
6356 llvm_unreachable("cannot be _Atomic qualified");
6358 case DeclaratorChunk::Pointer:
6359 Loc = Chunk.Ptr.AtomicQualLoc;
6362 case DeclaratorChunk::BlockPointer:
6363 case DeclaratorChunk::Reference:
6364 case DeclaratorChunk::MemberPointer:
6365 // FIXME: Provide a source location for the _Atomic keyword.
6370 ATL.setParensRange(SourceRange());
6374 fillDependentAddressSpaceTypeLoc(DependentAddressSpaceTypeLoc DASTL,
6375 const ParsedAttributesView &Attrs) {
6376 for (const ParsedAttr &AL : Attrs) {
6377 if (AL.getKind() == ParsedAttr::AT_AddressSpace) {
6378 DASTL.setAttrNameLoc(AL.getLoc());
6379 DASTL.setAttrExprOperand(AL.getArgAsExpr(0));
6380 DASTL.setAttrOperandParensRange(SourceRange());
6386 "no address_space attribute found at the expected location!");
6389 static void fillMatrixTypeLoc(MatrixTypeLoc MTL,
6390 const ParsedAttributesView &Attrs) {
6391 for (const ParsedAttr &AL : Attrs) {
6392 if (AL.getKind() == ParsedAttr::AT_MatrixType) {
6393 MTL.setAttrNameLoc(AL.getLoc());
6394 MTL.setAttrRowOperand(AL.getArgAsExpr(0));
6395 MTL.setAttrColumnOperand(AL.getArgAsExpr(1));
6396 MTL.setAttrOperandParensRange(SourceRange());
6401 llvm_unreachable("no matrix_type attribute found at the expected location!");
6404 /// Create and instantiate a TypeSourceInfo with type source information.
6406 /// \param T QualType referring to the type as written in source code.
6408 /// \param ReturnTypeInfo For declarators whose return type does not show
6409 /// up in the normal place in the declaration specifiers (such as a C++
6410 /// conversion function), this pointer will refer to a type source information
6411 /// for that return type.
6412 static TypeSourceInfo *
6413 GetTypeSourceInfoForDeclarator(TypeProcessingState &State,
6414 QualType T, TypeSourceInfo *ReturnTypeInfo) {
6415 Sema &S = State.getSema();
6416 Declarator &D = State.getDeclarator();
6418 TypeSourceInfo *TInfo = S.Context.CreateTypeSourceInfo(T);
6419 UnqualTypeLoc CurrTL = TInfo->getTypeLoc().getUnqualifiedLoc();
6421 // Handle parameter packs whose type is a pack expansion.
6422 if (isa<PackExpansionType>(T)) {
6423 CurrTL.castAs<PackExpansionTypeLoc>().setEllipsisLoc(D.getEllipsisLoc());
6424 CurrTL = CurrTL.getNextTypeLoc().getUnqualifiedLoc();
6427 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) {
6428 // An AtomicTypeLoc might be produced by an atomic qualifier in this
6429 // declarator chunk.
6430 if (AtomicTypeLoc ATL = CurrTL.getAs<AtomicTypeLoc>()) {
6431 fillAtomicQualLoc(ATL, D.getTypeObject(i));
6432 CurrTL = ATL.getValueLoc().getUnqualifiedLoc();
6435 while (MacroQualifiedTypeLoc TL = CurrTL.getAs<MacroQualifiedTypeLoc>()) {
6437 State.getExpansionLocForMacroQualifiedType(TL.getTypePtr()));
6438 CurrTL = TL.getNextTypeLoc().getUnqualifiedLoc();
6441 while (AttributedTypeLoc TL = CurrTL.getAs<AttributedTypeLoc>()) {
6442 fillAttributedTypeLoc(TL, State);
6443 CurrTL = TL.getNextTypeLoc().getUnqualifiedLoc();
6446 while (DependentAddressSpaceTypeLoc TL =
6447 CurrTL.getAs<DependentAddressSpaceTypeLoc>()) {
6448 fillDependentAddressSpaceTypeLoc(TL, D.getTypeObject(i).getAttrs());
6449 CurrTL = TL.getPointeeTypeLoc().getUnqualifiedLoc();
6452 if (MatrixTypeLoc TL = CurrTL.getAs<MatrixTypeLoc>())
6453 fillMatrixTypeLoc(TL, D.getTypeObject(i).getAttrs());
6455 // FIXME: Ordering here?
6456 while (AdjustedTypeLoc TL = CurrTL.getAs<AdjustedTypeLoc>())
6457 CurrTL = TL.getNextTypeLoc().getUnqualifiedLoc();
6459 DeclaratorLocFiller(S.Context, State, D.getTypeObject(i)).Visit(CurrTL);
6460 CurrTL = CurrTL.getNextTypeLoc().getUnqualifiedLoc();
6463 // If we have different source information for the return type, use
6464 // that. This really only applies to C++ conversion functions.
6465 if (ReturnTypeInfo) {
6466 TypeLoc TL = ReturnTypeInfo->getTypeLoc();
6467 assert(TL.getFullDataSize() == CurrTL.getFullDataSize());
6468 memcpy(CurrTL.getOpaqueData(), TL.getOpaqueData(), TL.getFullDataSize());
6470 TypeSpecLocFiller(S, S.Context, State, D.getDeclSpec()).Visit(CurrTL);
6476 /// Create a LocInfoType to hold the given QualType and TypeSourceInfo.
6477 ParsedType Sema::CreateParsedType(QualType T, TypeSourceInfo *TInfo) {
6478 // FIXME: LocInfoTypes are "transient", only needed for passing to/from Parser
6479 // and Sema during declaration parsing. Try deallocating/caching them when
6480 // it's appropriate, instead of allocating them and keeping them around.
6481 LocInfoType *LocT = (LocInfoType*)BumpAlloc.Allocate(sizeof(LocInfoType),
6483 new (LocT) LocInfoType(T, TInfo);
6484 assert(LocT->getTypeClass() != T->getTypeClass() &&
6485 "LocInfoType's TypeClass conflicts with an existing Type class");
6486 return ParsedType::make(QualType(LocT, 0));
6489 void LocInfoType::getAsStringInternal(std::string &Str,
6490 const PrintingPolicy &Policy) const {
6491 llvm_unreachable("LocInfoType leaked into the type system; an opaque TypeTy*"
6492 " was used directly instead of getting the QualType through"
6493 " GetTypeFromParser");
6496 TypeResult Sema::ActOnTypeName(Scope *S, Declarator &D) {
6497 // C99 6.7.6: Type names have no identifier. This is already validated by
6499 assert(D.getIdentifier() == nullptr &&
6500 "Type name should have no identifier!");
6502 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S);
6503 QualType T = TInfo->getType();
6504 if (D.isInvalidType())
6507 // Make sure there are no unused decl attributes on the declarator.
6508 // We don't want to do this for ObjC parameters because we're going
6509 // to apply them to the actual parameter declaration.
6510 // Likewise, we don't want to do this for alias declarations, because
6511 // we are actually going to build a declaration from this eventually.
6512 if (D.getContext() != DeclaratorContext::ObjCParameter &&
6513 D.getContext() != DeclaratorContext::AliasDecl &&
6514 D.getContext() != DeclaratorContext::AliasTemplate)
6515 checkUnusedDeclAttributes(D);
6517 if (getLangOpts().CPlusPlus) {
6518 // Check that there are no default arguments (C++ only).
6519 CheckExtraCXXDefaultArguments(D);
6522 return CreateParsedType(T, TInfo);
6525 ParsedType Sema::ActOnObjCInstanceType(SourceLocation Loc) {
6526 QualType T = Context.getObjCInstanceType();
6527 TypeSourceInfo *TInfo = Context.getTrivialTypeSourceInfo(T, Loc);
6528 return CreateParsedType(T, TInfo);
6531 //===----------------------------------------------------------------------===//
6532 // Type Attribute Processing
6533 //===----------------------------------------------------------------------===//
6535 /// Build an AddressSpace index from a constant expression and diagnose any
6536 /// errors related to invalid address_spaces. Returns true on successfully
6537 /// building an AddressSpace index.
6538 static bool BuildAddressSpaceIndex(Sema &S, LangAS &ASIdx,
6539 const Expr *AddrSpace,
6540 SourceLocation AttrLoc) {
6541 if (!AddrSpace->isValueDependent()) {
6542 Optional<llvm::APSInt> OptAddrSpace =
6543 AddrSpace->getIntegerConstantExpr(S.Context);
6544 if (!OptAddrSpace) {
6545 S.Diag(AttrLoc, diag::err_attribute_argument_type)
6546 << "'address_space'" << AANT_ArgumentIntegerConstant
6547 << AddrSpace->getSourceRange();
6550 llvm::APSInt &addrSpace = *OptAddrSpace;
6553 if (addrSpace.isSigned()) {
6554 if (addrSpace.isNegative()) {
6555 S.Diag(AttrLoc, diag::err_attribute_address_space_negative)
6556 << AddrSpace->getSourceRange();
6559 addrSpace.setIsSigned(false);
6562 llvm::APSInt max(addrSpace.getBitWidth());
6564 Qualifiers::MaxAddressSpace - (unsigned)LangAS::FirstTargetAddressSpace;
6566 if (addrSpace > max) {
6567 S.Diag(AttrLoc, diag::err_attribute_address_space_too_high)
6568 << (unsigned)max.getZExtValue() << AddrSpace->getSourceRange();
6573 getLangASFromTargetAS(static_cast<unsigned>(addrSpace.getZExtValue()));
6577 // Default value for DependentAddressSpaceTypes
6578 ASIdx = LangAS::Default;
6582 /// BuildAddressSpaceAttr - Builds a DependentAddressSpaceType if an expression
6583 /// is uninstantiated. If instantiated it will apply the appropriate address
6584 /// space to the type. This function allows dependent template variables to be
6585 /// used in conjunction with the address_space attribute
6586 QualType Sema::BuildAddressSpaceAttr(QualType &T, LangAS ASIdx, Expr *AddrSpace,
6587 SourceLocation AttrLoc) {
6588 if (!AddrSpace->isValueDependent()) {
6589 if (DiagnoseMultipleAddrSpaceAttributes(*this, T.getAddressSpace(), ASIdx,
6593 return Context.getAddrSpaceQualType(T, ASIdx);
6596 // A check with similar intentions as checking if a type already has an
6597 // address space except for on a dependent types, basically if the
6598 // current type is already a DependentAddressSpaceType then its already
6599 // lined up to have another address space on it and we can't have
6600 // multiple address spaces on the one pointer indirection
6601 if (T->getAs<DependentAddressSpaceType>()) {
6602 Diag(AttrLoc, diag::err_attribute_address_multiple_qualifiers);
6606 return Context.getDependentAddressSpaceType(T, AddrSpace, AttrLoc);
6609 QualType Sema::BuildAddressSpaceAttr(QualType &T, Expr *AddrSpace,
6610 SourceLocation AttrLoc) {
6612 if (!BuildAddressSpaceIndex(*this, ASIdx, AddrSpace, AttrLoc))
6614 return BuildAddressSpaceAttr(T, ASIdx, AddrSpace, AttrLoc);
6617 static void HandleBTFTypeTagAttribute(QualType &Type, const ParsedAttr &Attr,
6618 TypeProcessingState &State) {
6619 Sema &S = State.getSema();
6621 // Check the number of attribute arguments.
6622 if (Attr.getNumArgs() != 1) {
6623 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments)
6629 // Ensure the argument is a string.
6630 auto *StrLiteral = dyn_cast<StringLiteral>(Attr.getArgAsExpr(0));
6632 S.Diag(Attr.getLoc(), diag::err_attribute_argument_type)
6633 << Attr << AANT_ArgumentString;
6638 ASTContext &Ctx = S.Context;
6639 StringRef BTFTypeTag = StrLiteral->getString();
6640 Type = State.getBTFTagAttributedType(
6641 ::new (Ctx) BTFTypeTagAttr(Ctx, Attr, BTFTypeTag), Type);
6644 /// HandleAddressSpaceTypeAttribute - Process an address_space attribute on the
6645 /// specified type. The attribute contains 1 argument, the id of the address
6646 /// space for the type.
6647 static void HandleAddressSpaceTypeAttribute(QualType &Type,
6648 const ParsedAttr &Attr,
6649 TypeProcessingState &State) {
6650 Sema &S = State.getSema();
6652 // ISO/IEC TR 18037 S5.3 (amending C99 6.7.3): "A function type shall not be
6653 // qualified by an address-space qualifier."
6654 if (Type->isFunctionType()) {
6655 S.Diag(Attr.getLoc(), diag::err_attribute_address_function_type);
6661 if (Attr.getKind() == ParsedAttr::AT_AddressSpace) {
6663 // Check the attribute arguments.
6664 if (Attr.getNumArgs() != 1) {
6665 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << Attr
6671 Expr *ASArgExpr = static_cast<Expr *>(Attr.getArgAsExpr(0));
6673 if (!BuildAddressSpaceIndex(S, ASIdx, ASArgExpr, Attr.getLoc())) {
6678 ASTContext &Ctx = S.Context;
6680 ::new (Ctx) AddressSpaceAttr(Ctx, Attr, static_cast<unsigned>(ASIdx));
6682 // If the expression is not value dependent (not templated), then we can
6683 // apply the address space qualifiers just to the equivalent type.
6684 // Otherwise, we make an AttributedType with the modified and equivalent
6685 // type the same, and wrap it in a DependentAddressSpaceType. When this
6686 // dependent type is resolved, the qualifier is added to the equivalent type
6689 if (!ASArgExpr->isValueDependent()) {
6690 QualType EquivType =
6691 S.BuildAddressSpaceAttr(Type, ASIdx, ASArgExpr, Attr.getLoc());
6692 if (EquivType.isNull()) {
6696 T = State.getAttributedType(ASAttr, Type, EquivType);
6698 T = State.getAttributedType(ASAttr, Type, Type);
6699 T = S.BuildAddressSpaceAttr(T, ASIdx, ASArgExpr, Attr.getLoc());
6707 // The keyword-based type attributes imply which address space to use.
6708 ASIdx = S.getLangOpts().SYCLIsDevice ? Attr.asSYCLLangAS()
6709 : Attr.asOpenCLLangAS();
6711 if (ASIdx == LangAS::Default)
6712 llvm_unreachable("Invalid address space");
6714 if (DiagnoseMultipleAddrSpaceAttributes(S, Type.getAddressSpace(), ASIdx,
6720 Type = S.Context.getAddrSpaceQualType(Type, ASIdx);
6724 /// handleObjCOwnershipTypeAttr - Process an objc_ownership
6725 /// attribute on the specified type.
6727 /// Returns 'true' if the attribute was handled.
6728 static bool handleObjCOwnershipTypeAttr(TypeProcessingState &state,
6729 ParsedAttr &attr, QualType &type) {
6730 bool NonObjCPointer = false;
6732 if (!type->isDependentType() && !type->isUndeducedType()) {
6733 if (const PointerType *ptr = type->getAs<PointerType>()) {
6734 QualType pointee = ptr->getPointeeType();
6735 if (pointee->isObjCRetainableType() || pointee->isPointerType())
6737 // It is important not to lose the source info that there was an attribute
6738 // applied to non-objc pointer. We will create an attributed type but
6739 // its type will be the same as the original type.
6740 NonObjCPointer = true;
6741 } else if (!type->isObjCRetainableType()) {
6745 // Don't accept an ownership attribute in the declspec if it would
6746 // just be the return type of a block pointer.
6747 if (state.isProcessingDeclSpec()) {
6748 Declarator &D = state.getDeclarator();
6749 if (maybeMovePastReturnType(D, D.getNumTypeObjects(),
6750 /*onlyBlockPointers=*/true))
6755 Sema &S = state.getSema();
6756 SourceLocation AttrLoc = attr.getLoc();
6757 if (AttrLoc.isMacroID())
6759 S.getSourceManager().getImmediateExpansionRange(AttrLoc).getBegin();
6761 if (!attr.isArgIdent(0)) {
6762 S.Diag(AttrLoc, diag::err_attribute_argument_type) << attr
6763 << AANT_ArgumentString;
6768 IdentifierInfo *II = attr.getArgAsIdent(0)->Ident;
6769 Qualifiers::ObjCLifetime lifetime;
6770 if (II->isStr("none"))
6771 lifetime = Qualifiers::OCL_ExplicitNone;
6772 else if (II->isStr("strong"))
6773 lifetime = Qualifiers::OCL_Strong;
6774 else if (II->isStr("weak"))
6775 lifetime = Qualifiers::OCL_Weak;
6776 else if (II->isStr("autoreleasing"))
6777 lifetime = Qualifiers::OCL_Autoreleasing;
6779 S.Diag(AttrLoc, diag::warn_attribute_type_not_supported) << attr << II;
6784 // Just ignore lifetime attributes other than __weak and __unsafe_unretained
6785 // outside of ARC mode.
6786 if (!S.getLangOpts().ObjCAutoRefCount &&
6787 lifetime != Qualifiers::OCL_Weak &&
6788 lifetime != Qualifiers::OCL_ExplicitNone) {
6792 SplitQualType underlyingType = type.split();
6794 // Check for redundant/conflicting ownership qualifiers.
6795 if (Qualifiers::ObjCLifetime previousLifetime
6796 = type.getQualifiers().getObjCLifetime()) {
6797 // If it's written directly, that's an error.
6798 if (S.Context.hasDirectOwnershipQualifier(type)) {
6799 S.Diag(AttrLoc, diag::err_attr_objc_ownership_redundant)
6804 // Otherwise, if the qualifiers actually conflict, pull sugar off
6805 // and remove the ObjCLifetime qualifiers.
6806 if (previousLifetime != lifetime) {
6807 // It's possible to have multiple local ObjCLifetime qualifiers. We
6808 // can't stop after we reach a type that is directly qualified.
6809 const Type *prevTy = nullptr;
6810 while (!prevTy || prevTy != underlyingType.Ty) {
6811 prevTy = underlyingType.Ty;
6812 underlyingType = underlyingType.getSingleStepDesugaredType();
6814 underlyingType.Quals.removeObjCLifetime();
6818 underlyingType.Quals.addObjCLifetime(lifetime);
6820 if (NonObjCPointer) {
6821 StringRef name = attr.getAttrName()->getName();
6823 case Qualifiers::OCL_None:
6824 case Qualifiers::OCL_ExplicitNone:
6826 case Qualifiers::OCL_Strong: name = "__strong"; break;
6827 case Qualifiers::OCL_Weak: name = "__weak"; break;
6828 case Qualifiers::OCL_Autoreleasing: name = "__autoreleasing"; break;
6830 S.Diag(AttrLoc, diag::warn_type_attribute_wrong_type) << name
6831 << TDS_ObjCObjOrBlock << type;
6834 // Don't actually add the __unsafe_unretained qualifier in non-ARC files,
6835 // because having both 'T' and '__unsafe_unretained T' exist in the type
6836 // system causes unfortunate widespread consistency problems. (For example,
6837 // they're not considered compatible types, and we mangle them identicially
6838 // as template arguments.) These problems are all individually fixable,
6839 // but it's easier to just not add the qualifier and instead sniff it out
6840 // in specific places using isObjCInertUnsafeUnretainedType().
6842 // Doing this does means we miss some trivial consistency checks that
6843 // would've triggered in ARC, but that's better than trying to solve all
6844 // the coexistence problems with __unsafe_unretained.
6845 if (!S.getLangOpts().ObjCAutoRefCount &&
6846 lifetime == Qualifiers::OCL_ExplicitNone) {
6847 type = state.getAttributedType(
6848 createSimpleAttr<ObjCInertUnsafeUnretainedAttr>(S.Context, attr),
6853 QualType origType = type;
6854 if (!NonObjCPointer)
6855 type = S.Context.getQualifiedType(underlyingType);
6857 // If we have a valid source location for the attribute, use an
6858 // AttributedType instead.
6859 if (AttrLoc.isValid()) {
6860 type = state.getAttributedType(::new (S.Context)
6861 ObjCOwnershipAttr(S.Context, attr, II),
6865 auto diagnoseOrDelay = [](Sema &S, SourceLocation loc,
6866 unsigned diagnostic, QualType type) {
6867 if (S.DelayedDiagnostics.shouldDelayDiagnostics()) {
6868 S.DelayedDiagnostics.add(
6869 sema::DelayedDiagnostic::makeForbiddenType(
6870 S.getSourceManager().getExpansionLoc(loc),
6871 diagnostic, type, /*ignored*/ 0));
6873 S.Diag(loc, diagnostic);
6877 // Sometimes, __weak isn't allowed.
6878 if (lifetime == Qualifiers::OCL_Weak &&
6879 !S.getLangOpts().ObjCWeak && !NonObjCPointer) {
6881 // Use a specialized diagnostic if the runtime just doesn't support them.
6882 unsigned diagnostic =
6883 (S.getLangOpts().ObjCWeakRuntime ? diag::err_arc_weak_disabled
6884 : diag::err_arc_weak_no_runtime);
6886 // In any case, delay the diagnostic until we know what we're parsing.
6887 diagnoseOrDelay(S, AttrLoc, diagnostic, type);
6893 // Forbid __weak for class objects marked as
6894 // objc_arc_weak_reference_unavailable
6895 if (lifetime == Qualifiers::OCL_Weak) {
6896 if (const ObjCObjectPointerType *ObjT =
6897 type->getAs<ObjCObjectPointerType>()) {
6898 if (ObjCInterfaceDecl *Class = ObjT->getInterfaceDecl()) {
6899 if (Class->isArcWeakrefUnavailable()) {
6900 S.Diag(AttrLoc, diag::err_arc_unsupported_weak_class);
6901 S.Diag(ObjT->getInterfaceDecl()->getLocation(),
6902 diag::note_class_declared);
6911 /// handleObjCGCTypeAttr - Process the __attribute__((objc_gc)) type
6912 /// attribute on the specified type. Returns true to indicate that
6913 /// the attribute was handled, false to indicate that the type does
6914 /// not permit the attribute.
6915 static bool handleObjCGCTypeAttr(TypeProcessingState &state, ParsedAttr &attr,
6917 Sema &S = state.getSema();
6919 // Delay if this isn't some kind of pointer.
6920 if (!type->isPointerType() &&
6921 !type->isObjCObjectPointerType() &&
6922 !type->isBlockPointerType())
6925 if (type.getObjCGCAttr() != Qualifiers::GCNone) {
6926 S.Diag(attr.getLoc(), diag::err_attribute_multiple_objc_gc);
6931 // Check the attribute arguments.
6932 if (!attr.isArgIdent(0)) {
6933 S.Diag(attr.getLoc(), diag::err_attribute_argument_type)
6934 << attr << AANT_ArgumentString;
6938 Qualifiers::GC GCAttr;
6939 if (attr.getNumArgs() > 1) {
6940 S.Diag(attr.getLoc(), diag::err_attribute_wrong_number_arguments) << attr
6946 IdentifierInfo *II = attr.getArgAsIdent(0)->Ident;
6947 if (II->isStr("weak"))
6948 GCAttr = Qualifiers::Weak;
6949 else if (II->isStr("strong"))
6950 GCAttr = Qualifiers::Strong;
6952 S.Diag(attr.getLoc(), diag::warn_attribute_type_not_supported)
6958 QualType origType = type;
6959 type = S.Context.getObjCGCQualType(origType, GCAttr);
6961 // Make an attributed type to preserve the source information.
6962 if (attr.getLoc().isValid())
6963 type = state.getAttributedType(
6964 ::new (S.Context) ObjCGCAttr(S.Context, attr, II), origType, type);
6970 /// A helper class to unwrap a type down to a function for the
6971 /// purposes of applying attributes there.
6974 /// FunctionTypeUnwrapper unwrapped(SemaRef, T);
6975 /// if (unwrapped.isFunctionType()) {
6976 /// const FunctionType *fn = unwrapped.get();
6977 /// // change fn somehow
6978 /// T = unwrapped.wrap(fn);
6980 struct FunctionTypeUnwrapper {
6994 const FunctionType *Fn;
6995 SmallVector<unsigned char /*WrapKind*/, 8> Stack;
6997 FunctionTypeUnwrapper(Sema &S, QualType T) : Original(T) {
6999 const Type *Ty = T.getTypePtr();
7000 if (isa<FunctionType>(Ty)) {
7001 Fn = cast<FunctionType>(Ty);
7003 } else if (isa<ParenType>(Ty)) {
7004 T = cast<ParenType>(Ty)->getInnerType();
7005 Stack.push_back(Parens);
7006 } else if (isa<ConstantArrayType>(Ty) || isa<VariableArrayType>(Ty) ||
7007 isa<IncompleteArrayType>(Ty)) {
7008 T = cast<ArrayType>(Ty)->getElementType();
7009 Stack.push_back(Array);
7010 } else if (isa<PointerType>(Ty)) {
7011 T = cast<PointerType>(Ty)->getPointeeType();
7012 Stack.push_back(Pointer);
7013 } else if (isa<BlockPointerType>(Ty)) {
7014 T = cast<BlockPointerType>(Ty)->getPointeeType();
7015 Stack.push_back(BlockPointer);
7016 } else if (isa<MemberPointerType>(Ty)) {
7017 T = cast<MemberPointerType>(Ty)->getPointeeType();
7018 Stack.push_back(MemberPointer);
7019 } else if (isa<ReferenceType>(Ty)) {
7020 T = cast<ReferenceType>(Ty)->getPointeeType();
7021 Stack.push_back(Reference);
7022 } else if (isa<AttributedType>(Ty)) {
7023 T = cast<AttributedType>(Ty)->getEquivalentType();
7024 Stack.push_back(Attributed);
7025 } else if (isa<MacroQualifiedType>(Ty)) {
7026 T = cast<MacroQualifiedType>(Ty)->getUnderlyingType();
7027 Stack.push_back(MacroQualified);
7029 const Type *DTy = Ty->getUnqualifiedDesugaredType();
7035 T = QualType(DTy, 0);
7036 Stack.push_back(Desugar);
7041 bool isFunctionType() const { return (Fn != nullptr); }
7042 const FunctionType *get() const { return Fn; }
7044 QualType wrap(Sema &S, const FunctionType *New) {
7045 // If T wasn't modified from the unwrapped type, do nothing.
7046 if (New == get()) return Original;
7049 return wrap(S.Context, Original, 0);
7053 QualType wrap(ASTContext &C, QualType Old, unsigned I) {
7054 if (I == Stack.size())
7055 return C.getQualifiedType(Fn, Old.getQualifiers());
7057 // Build up the inner type, applying the qualifiers from the old
7058 // type to the new type.
7059 SplitQualType SplitOld = Old.split();
7061 // As a special case, tail-recurse if there are no qualifiers.
7062 if (SplitOld.Quals.empty())
7063 return wrap(C, SplitOld.Ty, I);
7064 return C.getQualifiedType(wrap(C, SplitOld.Ty, I), SplitOld.Quals);
7067 QualType wrap(ASTContext &C, const Type *Old, unsigned I) {
7068 if (I == Stack.size()) return QualType(Fn, 0);
7070 switch (static_cast<WrapKind>(Stack[I++])) {
7072 // This is the point at which we potentially lose source
7074 return wrap(C, Old->getUnqualifiedDesugaredType(), I);
7077 return wrap(C, cast<AttributedType>(Old)->getEquivalentType(), I);
7080 QualType New = wrap(C, cast<ParenType>(Old)->getInnerType(), I);
7081 return C.getParenType(New);
7084 case MacroQualified:
7085 return wrap(C, cast<MacroQualifiedType>(Old)->getUnderlyingType(), I);
7088 if (const auto *CAT = dyn_cast<ConstantArrayType>(Old)) {
7089 QualType New = wrap(C, CAT->getElementType(), I);
7090 return C.getConstantArrayType(New, CAT->getSize(), CAT->getSizeExpr(),
7091 CAT->getSizeModifier(),
7092 CAT->getIndexTypeCVRQualifiers());
7095 if (const auto *VAT = dyn_cast<VariableArrayType>(Old)) {
7096 QualType New = wrap(C, VAT->getElementType(), I);
7097 return C.getVariableArrayType(
7098 New, VAT->getSizeExpr(), VAT->getSizeModifier(),
7099 VAT->getIndexTypeCVRQualifiers(), VAT->getBracketsRange());
7102 const auto *IAT = cast<IncompleteArrayType>(Old);
7103 QualType New = wrap(C, IAT->getElementType(), I);
7104 return C.getIncompleteArrayType(New, IAT->getSizeModifier(),
7105 IAT->getIndexTypeCVRQualifiers());
7109 QualType New = wrap(C, cast<PointerType>(Old)->getPointeeType(), I);
7110 return C.getPointerType(New);
7113 case BlockPointer: {
7114 QualType New = wrap(C, cast<BlockPointerType>(Old)->getPointeeType(),I);
7115 return C.getBlockPointerType(New);
7118 case MemberPointer: {
7119 const MemberPointerType *OldMPT = cast<MemberPointerType>(Old);
7120 QualType New = wrap(C, OldMPT->getPointeeType(), I);
7121 return C.getMemberPointerType(New, OldMPT->getClass());
7125 const ReferenceType *OldRef = cast<ReferenceType>(Old);
7126 QualType New = wrap(C, OldRef->getPointeeType(), I);
7127 if (isa<LValueReferenceType>(OldRef))
7128 return C.getLValueReferenceType(New, OldRef->isSpelledAsLValue());
7130 return C.getRValueReferenceType(New);
7134 llvm_unreachable("unknown wrapping kind");
7137 } // end anonymous namespace
7139 static bool handleMSPointerTypeQualifierAttr(TypeProcessingState &State,
7140 ParsedAttr &PAttr, QualType &Type) {
7141 Sema &S = State.getSema();
7144 switch (PAttr.getKind()) {
7145 default: llvm_unreachable("Unknown attribute kind");
7146 case ParsedAttr::AT_Ptr32:
7147 A = createSimpleAttr<Ptr32Attr>(S.Context, PAttr);
7149 case ParsedAttr::AT_Ptr64:
7150 A = createSimpleAttr<Ptr64Attr>(S.Context, PAttr);
7152 case ParsedAttr::AT_SPtr:
7153 A = createSimpleAttr<SPtrAttr>(S.Context, PAttr);
7155 case ParsedAttr::AT_UPtr:
7156 A = createSimpleAttr<UPtrAttr>(S.Context, PAttr);
7160 std::bitset<attr::LastAttr> Attrs;
7161 attr::Kind NewAttrKind = A->getKind();
7162 QualType Desugared = Type;
7163 const AttributedType *AT = dyn_cast<AttributedType>(Type);
7165 Attrs[AT->getAttrKind()] = true;
7166 Desugared = AT->getModifiedType();
7167 AT = dyn_cast<AttributedType>(Desugared);
7170 // You cannot specify duplicate type attributes, so if the attribute has
7171 // already been applied, flag it.
7172 if (Attrs[NewAttrKind]) {
7173 S.Diag(PAttr.getLoc(), diag::warn_duplicate_attribute_exact) << PAttr;
7176 Attrs[NewAttrKind] = true;
7178 // You cannot have both __sptr and __uptr on the same type, nor can you
7179 // have __ptr32 and __ptr64.
7180 if (Attrs[attr::Ptr32] && Attrs[attr::Ptr64]) {
7181 S.Diag(PAttr.getLoc(), diag::err_attributes_are_not_compatible)
7185 } else if (Attrs[attr::SPtr] && Attrs[attr::UPtr]) {
7186 S.Diag(PAttr.getLoc(), diag::err_attributes_are_not_compatible)
7192 // Pointer type qualifiers can only operate on pointer types, but not
7193 // pointer-to-member types.
7195 // FIXME: Should we really be disallowing this attribute if there is any
7196 // type sugar between it and the pointer (other than attributes)? Eg, this
7197 // disallows the attribute on a parenthesized pointer.
7198 // And if so, should we really allow *any* type attribute?
7199 if (!isa<PointerType>(Desugared)) {
7200 if (Type->isMemberPointerType())
7201 S.Diag(PAttr.getLoc(), diag::err_attribute_no_member_pointers) << PAttr;
7203 S.Diag(PAttr.getLoc(), diag::err_attribute_pointers_only) << PAttr << 0;
7207 // Add address space to type based on its attributes.
7208 LangAS ASIdx = LangAS::Default;
7209 uint64_t PtrWidth = S.Context.getTargetInfo().getPointerWidth(0);
7210 if (PtrWidth == 32) {
7211 if (Attrs[attr::Ptr64])
7212 ASIdx = LangAS::ptr64;
7213 else if (Attrs[attr::UPtr])
7214 ASIdx = LangAS::ptr32_uptr;
7215 } else if (PtrWidth == 64 && Attrs[attr::Ptr32]) {
7216 if (Attrs[attr::UPtr])
7217 ASIdx = LangAS::ptr32_uptr;
7219 ASIdx = LangAS::ptr32_sptr;
7222 QualType Pointee = Type->getPointeeType();
7223 if (ASIdx != LangAS::Default)
7224 Pointee = S.Context.getAddrSpaceQualType(
7225 S.Context.removeAddrSpaceQualType(Pointee), ASIdx);
7226 Type = State.getAttributedType(A, Type, S.Context.getPointerType(Pointee));
7230 /// Map a nullability attribute kind to a nullability kind.
7231 static NullabilityKind mapNullabilityAttrKind(ParsedAttr::Kind kind) {
7233 case ParsedAttr::AT_TypeNonNull:
7234 return NullabilityKind::NonNull;
7236 case ParsedAttr::AT_TypeNullable:
7237 return NullabilityKind::Nullable;
7239 case ParsedAttr::AT_TypeNullableResult:
7240 return NullabilityKind::NullableResult;
7242 case ParsedAttr::AT_TypeNullUnspecified:
7243 return NullabilityKind::Unspecified;
7246 llvm_unreachable("not a nullability attribute kind");
7250 /// Applies a nullability type specifier to the given type, if possible.
7252 /// \param state The type processing state.
7254 /// \param type The type to which the nullability specifier will be
7255 /// added. On success, this type will be updated appropriately.
7257 /// \param attr The attribute as written on the type.
7259 /// \param allowOnArrayType Whether to accept nullability specifiers on an
7260 /// array type (e.g., because it will decay to a pointer).
7262 /// \returns true if a problem has been diagnosed, false on success.
7263 static bool checkNullabilityTypeSpecifier(TypeProcessingState &state,
7266 bool allowOnArrayType) {
7267 Sema &S = state.getSema();
7269 NullabilityKind nullability = mapNullabilityAttrKind(attr.getKind());
7270 SourceLocation nullabilityLoc = attr.getLoc();
7271 bool isContextSensitive = attr.isContextSensitiveKeywordAttribute();
7273 recordNullabilitySeen(S, nullabilityLoc);
7275 // Check for existing nullability attributes on the type.
7276 QualType desugared = type;
7277 while (auto attributed = dyn_cast<AttributedType>(desugared.getTypePtr())) {
7278 // Check whether there is already a null
7279 if (auto existingNullability = attributed->getImmediateNullability()) {
7280 // Duplicated nullability.
7281 if (nullability == *existingNullability) {
7282 S.Diag(nullabilityLoc, diag::warn_nullability_duplicate)
7283 << DiagNullabilityKind(nullability, isContextSensitive)
7284 << FixItHint::CreateRemoval(nullabilityLoc);
7289 // Conflicting nullability.
7290 S.Diag(nullabilityLoc, diag::err_nullability_conflicting)
7291 << DiagNullabilityKind(nullability, isContextSensitive)
7292 << DiagNullabilityKind(*existingNullability, false);
7296 desugared = attributed->getModifiedType();
7299 // If there is already a different nullability specifier, complain.
7300 // This (unlike the code above) looks through typedefs that might
7301 // have nullability specifiers on them, which means we cannot
7302 // provide a useful Fix-It.
7303 if (auto existingNullability = desugared->getNullability(S.Context)) {
7304 if (nullability != *existingNullability) {
7305 S.Diag(nullabilityLoc, diag::err_nullability_conflicting)
7306 << DiagNullabilityKind(nullability, isContextSensitive)
7307 << DiagNullabilityKind(*existingNullability, false);
7309 // Try to find the typedef with the existing nullability specifier.
7310 if (auto typedefType = desugared->getAs<TypedefType>()) {
7311 TypedefNameDecl *typedefDecl = typedefType->getDecl();
7312 QualType underlyingType = typedefDecl->getUnderlyingType();
7313 if (auto typedefNullability
7314 = AttributedType::stripOuterNullability(underlyingType)) {
7315 if (*typedefNullability == *existingNullability) {
7316 S.Diag(typedefDecl->getLocation(), diag::note_nullability_here)
7317 << DiagNullabilityKind(*existingNullability, false);
7326 // If this definitely isn't a pointer type, reject the specifier.
7327 if (!desugared->canHaveNullability() &&
7328 !(allowOnArrayType && desugared->isArrayType())) {
7329 S.Diag(nullabilityLoc, diag::err_nullability_nonpointer)
7330 << DiagNullabilityKind(nullability, isContextSensitive) << type;
7334 // For the context-sensitive keywords/Objective-C property
7335 // attributes, require that the type be a single-level pointer.
7336 if (isContextSensitive) {
7337 // Make sure that the pointee isn't itself a pointer type.
7338 const Type *pointeeType = nullptr;
7339 if (desugared->isArrayType())
7340 pointeeType = desugared->getArrayElementTypeNoTypeQual();
7341 else if (desugared->isAnyPointerType())
7342 pointeeType = desugared->getPointeeType().getTypePtr();
7344 if (pointeeType && (pointeeType->isAnyPointerType() ||
7345 pointeeType->isObjCObjectPointerType() ||
7346 pointeeType->isMemberPointerType())) {
7347 S.Diag(nullabilityLoc, diag::err_nullability_cs_multilevel)
7348 << DiagNullabilityKind(nullability, true)
7350 S.Diag(nullabilityLoc, diag::note_nullability_type_specifier)
7351 << DiagNullabilityKind(nullability, false)
7353 << FixItHint::CreateReplacement(nullabilityLoc,
7354 getNullabilitySpelling(nullability));
7359 // Form the attributed type.
7360 type = state.getAttributedType(
7361 createNullabilityAttr(S.Context, attr, nullability), type, type);
7365 /// Check the application of the Objective-C '__kindof' qualifier to
7367 static bool checkObjCKindOfType(TypeProcessingState &state, QualType &type,
7369 Sema &S = state.getSema();
7371 if (isa<ObjCTypeParamType>(type)) {
7372 // Build the attributed type to record where __kindof occurred.
7373 type = state.getAttributedType(
7374 createSimpleAttr<ObjCKindOfAttr>(S.Context, attr), type, type);
7378 // Find out if it's an Objective-C object or object pointer type;
7379 const ObjCObjectPointerType *ptrType = type->getAs<ObjCObjectPointerType>();
7380 const ObjCObjectType *objType = ptrType ? ptrType->getObjectType()
7381 : type->getAs<ObjCObjectType>();
7383 // If not, we can't apply __kindof.
7385 // FIXME: Handle dependent types that aren't yet object types.
7386 S.Diag(attr.getLoc(), diag::err_objc_kindof_nonobject)
7391 // Rebuild the "equivalent" type, which pushes __kindof down into
7393 // There is no need to apply kindof on an unqualified id type.
7394 QualType equivType = S.Context.getObjCObjectType(
7395 objType->getBaseType(), objType->getTypeArgsAsWritten(),
7396 objType->getProtocols(),
7397 /*isKindOf=*/objType->isObjCUnqualifiedId() ? false : true);
7399 // If we started with an object pointer type, rebuild it.
7401 equivType = S.Context.getObjCObjectPointerType(equivType);
7402 if (auto nullability = type->getNullability(S.Context)) {
7403 // We create a nullability attribute from the __kindof attribute.
7404 // Make sure that will make sense.
7405 assert(attr.getAttributeSpellingListIndex() == 0 &&
7406 "multiple spellings for __kindof?");
7407 Attr *A = createNullabilityAttr(S.Context, attr, *nullability);
7408 A->setImplicit(true);
7409 equivType = state.getAttributedType(A, equivType, equivType);
7413 // Build the attributed type to record where __kindof occurred.
7414 type = state.getAttributedType(
7415 createSimpleAttr<ObjCKindOfAttr>(S.Context, attr), type, equivType);
7419 /// Distribute a nullability type attribute that cannot be applied to
7420 /// the type specifier to a pointer, block pointer, or member pointer
7421 /// declarator, complaining if necessary.
7423 /// \returns true if the nullability annotation was distributed, false
7425 static bool distributeNullabilityTypeAttr(TypeProcessingState &state,
7426 QualType type, ParsedAttr &attr) {
7427 Declarator &declarator = state.getDeclarator();
7429 /// Attempt to move the attribute to the specified chunk.
7430 auto moveToChunk = [&](DeclaratorChunk &chunk, bool inFunction) -> bool {
7431 // If there is already a nullability attribute there, don't add
7433 if (hasNullabilityAttr(chunk.getAttrs()))
7436 // Complain about the nullability qualifier being in the wrong
7443 PK_MemberFunctionPointer,
7445 = chunk.Kind == DeclaratorChunk::Pointer ? (inFunction ? PK_FunctionPointer
7447 : chunk.Kind == DeclaratorChunk::BlockPointer ? PK_BlockPointer
7448 : inFunction? PK_MemberFunctionPointer : PK_MemberPointer;
7450 auto diag = state.getSema().Diag(attr.getLoc(),
7451 diag::warn_nullability_declspec)
7452 << DiagNullabilityKind(mapNullabilityAttrKind(attr.getKind()),
7453 attr.isContextSensitiveKeywordAttribute())
7455 << static_cast<unsigned>(pointerKind);
7457 // FIXME: MemberPointer chunks don't carry the location of the *.
7458 if (chunk.Kind != DeclaratorChunk::MemberPointer) {
7459 diag << FixItHint::CreateRemoval(attr.getLoc())
7460 << FixItHint::CreateInsertion(
7461 state.getSema().getPreprocessor().getLocForEndOfToken(
7463 " " + attr.getAttrName()->getName().str() + " ");
7466 moveAttrFromListToList(attr, state.getCurrentAttributes(),
7471 // Move it to the outermost pointer, member pointer, or block
7472 // pointer declarator.
7473 for (unsigned i = state.getCurrentChunkIndex(); i != 0; --i) {
7474 DeclaratorChunk &chunk = declarator.getTypeObject(i-1);
7475 switch (chunk.Kind) {
7476 case DeclaratorChunk::Pointer:
7477 case DeclaratorChunk::BlockPointer:
7478 case DeclaratorChunk::MemberPointer:
7479 return moveToChunk(chunk, false);
7481 case DeclaratorChunk::Paren:
7482 case DeclaratorChunk::Array:
7485 case DeclaratorChunk::Function:
7486 // Try to move past the return type to a function/block/member
7487 // function pointer.
7488 if (DeclaratorChunk *dest = maybeMovePastReturnType(
7490 /*onlyBlockPointers=*/false)) {
7491 return moveToChunk(*dest, true);
7496 // Don't walk through these.
7497 case DeclaratorChunk::Reference:
7498 case DeclaratorChunk::Pipe:
7506 static Attr *getCCTypeAttr(ASTContext &Ctx, ParsedAttr &Attr) {
7507 assert(!Attr.isInvalid());
7508 switch (Attr.getKind()) {
7510 llvm_unreachable("not a calling convention attribute");
7511 case ParsedAttr::AT_CDecl:
7512 return createSimpleAttr<CDeclAttr>(Ctx, Attr);
7513 case ParsedAttr::AT_FastCall:
7514 return createSimpleAttr<FastCallAttr>(Ctx, Attr);
7515 case ParsedAttr::AT_StdCall:
7516 return createSimpleAttr<StdCallAttr>(Ctx, Attr);
7517 case ParsedAttr::AT_ThisCall:
7518 return createSimpleAttr<ThisCallAttr>(Ctx, Attr);
7519 case ParsedAttr::AT_RegCall:
7520 return createSimpleAttr<RegCallAttr>(Ctx, Attr);
7521 case ParsedAttr::AT_Pascal:
7522 return createSimpleAttr<PascalAttr>(Ctx, Attr);
7523 case ParsedAttr::AT_SwiftCall:
7524 return createSimpleAttr<SwiftCallAttr>(Ctx, Attr);
7525 case ParsedAttr::AT_SwiftAsyncCall:
7526 return createSimpleAttr<SwiftAsyncCallAttr>(Ctx, Attr);
7527 case ParsedAttr::AT_VectorCall:
7528 return createSimpleAttr<VectorCallAttr>(Ctx, Attr);
7529 case ParsedAttr::AT_AArch64VectorPcs:
7530 return createSimpleAttr<AArch64VectorPcsAttr>(Ctx, Attr);
7531 case ParsedAttr::AT_AArch64SVEPcs:
7532 return createSimpleAttr<AArch64SVEPcsAttr>(Ctx, Attr);
7533 case ParsedAttr::AT_AMDGPUKernelCall:
7534 return createSimpleAttr<AMDGPUKernelCallAttr>(Ctx, Attr);
7535 case ParsedAttr::AT_Pcs: {
7536 // The attribute may have had a fixit applied where we treated an
7537 // identifier as a string literal. The contents of the string are valid,
7538 // but the form may not be.
7540 if (Attr.isArgExpr(0))
7541 Str = cast<StringLiteral>(Attr.getArgAsExpr(0))->getString();
7543 Str = Attr.getArgAsIdent(0)->Ident->getName();
7544 PcsAttr::PCSType Type;
7545 if (!PcsAttr::ConvertStrToPCSType(Str, Type))
7546 llvm_unreachable("already validated the attribute");
7547 return ::new (Ctx) PcsAttr(Ctx, Attr, Type);
7549 case ParsedAttr::AT_IntelOclBicc:
7550 return createSimpleAttr<IntelOclBiccAttr>(Ctx, Attr);
7551 case ParsedAttr::AT_MSABI:
7552 return createSimpleAttr<MSABIAttr>(Ctx, Attr);
7553 case ParsedAttr::AT_SysVABI:
7554 return createSimpleAttr<SysVABIAttr>(Ctx, Attr);
7555 case ParsedAttr::AT_PreserveMost:
7556 return createSimpleAttr<PreserveMostAttr>(Ctx, Attr);
7557 case ParsedAttr::AT_PreserveAll:
7558 return createSimpleAttr<PreserveAllAttr>(Ctx, Attr);
7560 llvm_unreachable("unexpected attribute kind!");
7563 /// Process an individual function attribute. Returns true to
7564 /// indicate that the attribute was handled, false if it wasn't.
7565 static bool handleFunctionTypeAttr(TypeProcessingState &state, ParsedAttr &attr,
7567 Sema &S = state.getSema();
7569 FunctionTypeUnwrapper unwrapped(S, type);
7571 if (attr.getKind() == ParsedAttr::AT_NoReturn) {
7572 if (S.CheckAttrNoArgs(attr))
7575 // Delay if this is not a function type.
7576 if (!unwrapped.isFunctionType())
7579 // Otherwise we can process right away.
7580 FunctionType::ExtInfo EI = unwrapped.get()->getExtInfo().withNoReturn(true);
7581 type = unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI));
7585 if (attr.getKind() == ParsedAttr::AT_CmseNSCall) {
7586 // Delay if this is not a function type.
7587 if (!unwrapped.isFunctionType())
7590 // Ignore if we don't have CMSE enabled.
7591 if (!S.getLangOpts().Cmse) {
7592 S.Diag(attr.getLoc(), diag::warn_attribute_ignored) << attr;
7597 // Otherwise we can process right away.
7598 FunctionType::ExtInfo EI =
7599 unwrapped.get()->getExtInfo().withCmseNSCall(true);
7600 type = unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI));
7604 // ns_returns_retained is not always a type attribute, but if we got
7605 // here, we're treating it as one right now.
7606 if (attr.getKind() == ParsedAttr::AT_NSReturnsRetained) {
7607 if (attr.getNumArgs()) return true;
7609 // Delay if this is not a function type.
7610 if (!unwrapped.isFunctionType())
7613 // Check whether the return type is reasonable.
7614 if (S.checkNSReturnsRetainedReturnType(attr.getLoc(),
7615 unwrapped.get()->getReturnType()))
7618 // Only actually change the underlying type in ARC builds.
7619 QualType origType = type;
7620 if (state.getSema().getLangOpts().ObjCAutoRefCount) {
7621 FunctionType::ExtInfo EI
7622 = unwrapped.get()->getExtInfo().withProducesResult(true);
7623 type = unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI));
7625 type = state.getAttributedType(
7626 createSimpleAttr<NSReturnsRetainedAttr>(S.Context, attr),
7631 if (attr.getKind() == ParsedAttr::AT_AnyX86NoCallerSavedRegisters) {
7632 if (S.CheckAttrTarget(attr) || S.CheckAttrNoArgs(attr))
7635 // Delay if this is not a function type.
7636 if (!unwrapped.isFunctionType())
7639 FunctionType::ExtInfo EI =
7640 unwrapped.get()->getExtInfo().withNoCallerSavedRegs(true);
7641 type = unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI));
7645 if (attr.getKind() == ParsedAttr::AT_AnyX86NoCfCheck) {
7646 if (!S.getLangOpts().CFProtectionBranch) {
7647 S.Diag(attr.getLoc(), diag::warn_nocf_check_attribute_ignored);
7652 if (S.CheckAttrTarget(attr) || S.CheckAttrNoArgs(attr))
7655 // If this is not a function type, warning will be asserted by subject
7657 if (!unwrapped.isFunctionType())
7660 FunctionType::ExtInfo EI =
7661 unwrapped.get()->getExtInfo().withNoCfCheck(true);
7662 type = unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI));
7666 if (attr.getKind() == ParsedAttr::AT_Regparm) {
7668 if (S.CheckRegparmAttr(attr, value))
7671 // Delay if this is not a function type.
7672 if (!unwrapped.isFunctionType())
7675 // Diagnose regparm with fastcall.
7676 const FunctionType *fn = unwrapped.get();
7677 CallingConv CC = fn->getCallConv();
7678 if (CC == CC_X86FastCall) {
7679 S.Diag(attr.getLoc(), diag::err_attributes_are_not_compatible)
7680 << FunctionType::getNameForCallConv(CC)
7686 FunctionType::ExtInfo EI =
7687 unwrapped.get()->getExtInfo().withRegParm(value);
7688 type = unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI));
7692 if (attr.getKind() == ParsedAttr::AT_NoThrow) {
7693 // Delay if this is not a function type.
7694 if (!unwrapped.isFunctionType())
7697 if (S.CheckAttrNoArgs(attr)) {
7702 // Otherwise we can process right away.
7703 auto *Proto = unwrapped.get()->castAs<FunctionProtoType>();
7705 // MSVC ignores nothrow if it is in conflict with an explicit exception
7707 if (Proto->hasExceptionSpec()) {
7708 switch (Proto->getExceptionSpecType()) {
7710 llvm_unreachable("This doesn't have an exception spec!");
7712 case EST_DynamicNone:
7713 case EST_BasicNoexcept:
7714 case EST_NoexceptTrue:
7716 // Exception spec doesn't conflict with nothrow, so don't warn.
7719 case EST_Uninstantiated:
7720 case EST_DependentNoexcept:
7721 case EST_Unevaluated:
7722 // We don't have enough information to properly determine if there is a
7723 // conflict, so suppress the warning.
7727 case EST_NoexceptFalse:
7728 S.Diag(attr.getLoc(), diag::warn_nothrow_attribute_ignored);
7734 type = unwrapped.wrap(
7736 .getFunctionTypeWithExceptionSpec(
7738 FunctionProtoType::ExceptionSpecInfo{EST_NoThrow})
7739 ->getAs<FunctionType>());
7743 // Delay if the type didn't work out to a function.
7744 if (!unwrapped.isFunctionType()) return false;
7746 // Otherwise, a calling convention.
7748 if (S.CheckCallingConvAttr(attr, CC))
7751 const FunctionType *fn = unwrapped.get();
7752 CallingConv CCOld = fn->getCallConv();
7753 Attr *CCAttr = getCCTypeAttr(S.Context, attr);
7756 // Error out on when there's already an attribute on the type
7757 // and the CCs don't match.
7758 if (S.getCallingConvAttributedType(type)) {
7759 S.Diag(attr.getLoc(), diag::err_attributes_are_not_compatible)
7760 << FunctionType::getNameForCallConv(CC)
7761 << FunctionType::getNameForCallConv(CCOld);
7767 // Diagnose use of variadic functions with calling conventions that
7768 // don't support them (e.g. because they're callee-cleanup).
7769 // We delay warning about this on unprototyped function declarations
7770 // until after redeclaration checking, just in case we pick up a
7771 // prototype that way. And apparently we also "delay" warning about
7772 // unprototyped function types in general, despite not necessarily having
7773 // much ability to diagnose it later.
7774 if (!supportsVariadicCall(CC)) {
7775 const FunctionProtoType *FnP = dyn_cast<FunctionProtoType>(fn);
7776 if (FnP && FnP->isVariadic()) {
7777 // stdcall and fastcall are ignored with a warning for GCC and MS
7779 if (CC == CC_X86StdCall || CC == CC_X86FastCall)
7780 return S.Diag(attr.getLoc(), diag::warn_cconv_unsupported)
7781 << FunctionType::getNameForCallConv(CC)
7782 << (int)Sema::CallingConventionIgnoredReason::VariadicFunction;
7785 return S.Diag(attr.getLoc(), diag::err_cconv_varargs)
7786 << FunctionType::getNameForCallConv(CC);
7790 // Also diagnose fastcall with regparm.
7791 if (CC == CC_X86FastCall && fn->getHasRegParm()) {
7792 S.Diag(attr.getLoc(), diag::err_attributes_are_not_compatible)
7793 << "regparm" << FunctionType::getNameForCallConv(CC_X86FastCall);
7798 // Modify the CC from the wrapped function type, wrap it all back, and then
7799 // wrap the whole thing in an AttributedType as written. The modified type
7800 // might have a different CC if we ignored the attribute.
7801 QualType Equivalent;
7805 auto EI = unwrapped.get()->getExtInfo().withCallingConv(CC);
7807 unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI));
7809 type = state.getAttributedType(CCAttr, type, Equivalent);
7813 bool Sema::hasExplicitCallingConv(QualType T) {
7814 const AttributedType *AT;
7816 // Stop if we'd be stripping off a typedef sugar node to reach the
7818 while ((AT = T->getAs<AttributedType>()) &&
7819 AT->getAs<TypedefType>() == T->getAs<TypedefType>()) {
7820 if (AT->isCallingConv())
7822 T = AT->getModifiedType();
7827 void Sema::adjustMemberFunctionCC(QualType &T, bool IsStatic, bool IsCtorOrDtor,
7828 SourceLocation Loc) {
7829 FunctionTypeUnwrapper Unwrapped(*this, T);
7830 const FunctionType *FT = Unwrapped.get();
7831 bool IsVariadic = (isa<FunctionProtoType>(FT) &&
7832 cast<FunctionProtoType>(FT)->isVariadic());
7833 CallingConv CurCC = FT->getCallConv();
7834 CallingConv ToCC = Context.getDefaultCallingConvention(IsVariadic, !IsStatic);
7839 // MS compiler ignores explicit calling convention attributes on structors. We
7840 // should do the same.
7841 if (Context.getTargetInfo().getCXXABI().isMicrosoft() && IsCtorOrDtor) {
7842 // Issue a warning on ignored calling convention -- except of __stdcall.
7843 // Again, this is what MS compiler does.
7844 if (CurCC != CC_X86StdCall)
7845 Diag(Loc, diag::warn_cconv_unsupported)
7846 << FunctionType::getNameForCallConv(CurCC)
7847 << (int)Sema::CallingConventionIgnoredReason::ConstructorDestructor;
7848 // Default adjustment.
7850 // Only adjust types with the default convention. For example, on Windows
7851 // we should adjust a __cdecl type to __thiscall for instance methods, and a
7852 // __thiscall type to __cdecl for static methods.
7853 CallingConv DefaultCC =
7854 Context.getDefaultCallingConvention(IsVariadic, IsStatic);
7856 if (CurCC != DefaultCC || DefaultCC == ToCC)
7859 if (hasExplicitCallingConv(T))
7863 FT = Context.adjustFunctionType(FT, FT->getExtInfo().withCallingConv(ToCC));
7864 QualType Wrapped = Unwrapped.wrap(*this, FT);
7865 T = Context.getAdjustedType(T, Wrapped);
7868 /// HandleVectorSizeAttribute - this attribute is only applicable to integral
7869 /// and float scalars, although arrays, pointers, and function return values are
7870 /// allowed in conjunction with this construct. Aggregates with this attribute
7871 /// are invalid, even if they are of the same size as a corresponding scalar.
7872 /// The raw attribute should contain precisely 1 argument, the vector size for
7873 /// the variable, measured in bytes. If curType and rawAttr are well formed,
7874 /// this routine will return a new vector type.
7875 static void HandleVectorSizeAttr(QualType &CurType, const ParsedAttr &Attr,
7877 // Check the attribute arguments.
7878 if (Attr.getNumArgs() != 1) {
7879 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << Attr
7885 Expr *SizeExpr = Attr.getArgAsExpr(0);
7886 QualType T = S.BuildVectorType(CurType, SizeExpr, Attr.getLoc());
7893 /// Process the OpenCL-like ext_vector_type attribute when it occurs on
7895 static void HandleExtVectorTypeAttr(QualType &CurType, const ParsedAttr &Attr,
7897 // check the attribute arguments.
7898 if (Attr.getNumArgs() != 1) {
7899 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << Attr
7904 Expr *SizeExpr = Attr.getArgAsExpr(0);
7905 QualType T = S.BuildExtVectorType(CurType, SizeExpr, Attr.getLoc());
7910 static bool isPermittedNeonBaseType(QualType &Ty,
7911 VectorType::VectorKind VecKind, Sema &S) {
7912 const BuiltinType *BTy = Ty->getAs<BuiltinType>();
7916 llvm::Triple Triple = S.Context.getTargetInfo().getTriple();
7918 // Signed poly is mathematically wrong, but has been baked into some ABIs by
7920 bool IsPolyUnsigned = Triple.getArch() == llvm::Triple::aarch64 ||
7921 Triple.getArch() == llvm::Triple::aarch64_32 ||
7922 Triple.getArch() == llvm::Triple::aarch64_be;
7923 if (VecKind == VectorType::NeonPolyVector) {
7924 if (IsPolyUnsigned) {
7925 // AArch64 polynomial vectors are unsigned.
7926 return BTy->getKind() == BuiltinType::UChar ||
7927 BTy->getKind() == BuiltinType::UShort ||
7928 BTy->getKind() == BuiltinType::ULong ||
7929 BTy->getKind() == BuiltinType::ULongLong;
7931 // AArch32 polynomial vectors are signed.
7932 return BTy->getKind() == BuiltinType::SChar ||
7933 BTy->getKind() == BuiltinType::Short ||
7934 BTy->getKind() == BuiltinType::LongLong;
7938 // Non-polynomial vector types: the usual suspects are allowed, as well as
7939 // float64_t on AArch64.
7940 if ((Triple.isArch64Bit() || Triple.getArch() == llvm::Triple::aarch64_32) &&
7941 BTy->getKind() == BuiltinType::Double)
7944 return BTy->getKind() == BuiltinType::SChar ||
7945 BTy->getKind() == BuiltinType::UChar ||
7946 BTy->getKind() == BuiltinType::Short ||
7947 BTy->getKind() == BuiltinType::UShort ||
7948 BTy->getKind() == BuiltinType::Int ||
7949 BTy->getKind() == BuiltinType::UInt ||
7950 BTy->getKind() == BuiltinType::Long ||
7951 BTy->getKind() == BuiltinType::ULong ||
7952 BTy->getKind() == BuiltinType::LongLong ||
7953 BTy->getKind() == BuiltinType::ULongLong ||
7954 BTy->getKind() == BuiltinType::Float ||
7955 BTy->getKind() == BuiltinType::Half ||
7956 BTy->getKind() == BuiltinType::BFloat16;
7959 static bool verifyValidIntegerConstantExpr(Sema &S, const ParsedAttr &Attr,
7960 llvm::APSInt &Result) {
7961 const auto *AttrExpr = Attr.getArgAsExpr(0);
7962 if (!AttrExpr->isTypeDependent()) {
7963 if (Optional<llvm::APSInt> Res =
7964 AttrExpr->getIntegerConstantExpr(S.Context)) {
7969 S.Diag(Attr.getLoc(), diag::err_attribute_argument_type)
7970 << Attr << AANT_ArgumentIntegerConstant << AttrExpr->getSourceRange();
7975 /// HandleNeonVectorTypeAttr - The "neon_vector_type" and
7976 /// "neon_polyvector_type" attributes are used to create vector types that
7977 /// are mangled according to ARM's ABI. Otherwise, these types are identical
7978 /// to those created with the "vector_size" attribute. Unlike "vector_size"
7979 /// the argument to these Neon attributes is the number of vector elements,
7980 /// not the vector size in bytes. The vector width and element type must
7981 /// match one of the standard Neon vector types.
7982 static void HandleNeonVectorTypeAttr(QualType &CurType, const ParsedAttr &Attr,
7983 Sema &S, VectorType::VectorKind VecKind) {
7984 // Target must have NEON (or MVE, whose vectors are similar enough
7985 // not to need a separate attribute)
7986 if (!S.Context.getTargetInfo().hasFeature("neon") &&
7987 !S.Context.getTargetInfo().hasFeature("mve")) {
7988 S.Diag(Attr.getLoc(), diag::err_attribute_unsupported)
7989 << Attr << "'neon' or 'mve'";
7993 // Check the attribute arguments.
7994 if (Attr.getNumArgs() != 1) {
7995 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << Attr
8000 // The number of elements must be an ICE.
8001 llvm::APSInt numEltsInt(32);
8002 if (!verifyValidIntegerConstantExpr(S, Attr, numEltsInt))
8005 // Only certain element types are supported for Neon vectors.
8006 if (!isPermittedNeonBaseType(CurType, VecKind, S)) {
8007 S.Diag(Attr.getLoc(), diag::err_attribute_invalid_vector_type) << CurType;
8012 // The total size of the vector must be 64 or 128 bits.
8013 unsigned typeSize = static_cast<unsigned>(S.Context.getTypeSize(CurType));
8014 unsigned numElts = static_cast<unsigned>(numEltsInt.getZExtValue());
8015 unsigned vecSize = typeSize * numElts;
8016 if (vecSize != 64 && vecSize != 128) {
8017 S.Diag(Attr.getLoc(), diag::err_attribute_bad_neon_vector_size) << CurType;
8022 CurType = S.Context.getVectorType(CurType, numElts, VecKind);
8025 /// HandleArmSveVectorBitsTypeAttr - The "arm_sve_vector_bits" attribute is
8026 /// used to create fixed-length versions of sizeless SVE types defined by
8027 /// the ACLE, such as svint32_t and svbool_t.
8028 static void HandleArmSveVectorBitsTypeAttr(QualType &CurType, ParsedAttr &Attr,
8030 // Target must have SVE.
8031 if (!S.Context.getTargetInfo().hasFeature("sve")) {
8032 S.Diag(Attr.getLoc(), diag::err_attribute_unsupported) << Attr << "'sve'";
8037 // Attribute is unsupported if '-msve-vector-bits=<bits>' isn't specified, or
8038 // if <bits>+ syntax is used.
8039 if (!S.getLangOpts().VScaleMin ||
8040 S.getLangOpts().VScaleMin != S.getLangOpts().VScaleMax) {
8041 S.Diag(Attr.getLoc(), diag::err_attribute_arm_feature_sve_bits_unsupported)
8047 // Check the attribute arguments.
8048 if (Attr.getNumArgs() != 1) {
8049 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments)
8055 // The vector size must be an integer constant expression.
8056 llvm::APSInt SveVectorSizeInBits(32);
8057 if (!verifyValidIntegerConstantExpr(S, Attr, SveVectorSizeInBits))
8060 unsigned VecSize = static_cast<unsigned>(SveVectorSizeInBits.getZExtValue());
8062 // The attribute vector size must match -msve-vector-bits.
8063 if (VecSize != S.getLangOpts().VScaleMin * 128) {
8064 S.Diag(Attr.getLoc(), diag::err_attribute_bad_sve_vector_size)
8065 << VecSize << S.getLangOpts().VScaleMin * 128;
8070 // Attribute can only be attached to a single SVE vector or predicate type.
8071 if (!CurType->isVLSTBuiltinType()) {
8072 S.Diag(Attr.getLoc(), diag::err_attribute_invalid_sve_type)
8078 const auto *BT = CurType->castAs<BuiltinType>();
8080 QualType EltType = CurType->getSveEltType(S.Context);
8081 unsigned TypeSize = S.Context.getTypeSize(EltType);
8082 VectorType::VectorKind VecKind = VectorType::SveFixedLengthDataVector;
8083 if (BT->getKind() == BuiltinType::SveBool) {
8084 // Predicates are represented as i8.
8085 VecSize /= S.Context.getCharWidth() * S.Context.getCharWidth();
8086 VecKind = VectorType::SveFixedLengthPredicateVector;
8088 VecSize /= TypeSize;
8089 CurType = S.Context.getVectorType(EltType, VecSize, VecKind);
8092 static void HandleArmMveStrictPolymorphismAttr(TypeProcessingState &State,
8095 const VectorType *VT = dyn_cast<VectorType>(CurType);
8096 if (!VT || VT->getVectorKind() != VectorType::NeonVector) {
8097 State.getSema().Diag(Attr.getLoc(),
8098 diag::err_attribute_arm_mve_polymorphism);
8104 State.getAttributedType(createSimpleAttr<ArmMveStrictPolymorphismAttr>(
8105 State.getSema().Context, Attr),
8109 /// Handle OpenCL Access Qualifier Attribute.
8110 static void HandleOpenCLAccessAttr(QualType &CurType, const ParsedAttr &Attr,
8112 // OpenCL v2.0 s6.6 - Access qualifier can be used only for image and pipe type.
8113 if (!(CurType->isImageType() || CurType->isPipeType())) {
8114 S.Diag(Attr.getLoc(), diag::err_opencl_invalid_access_qualifier);
8119 if (const TypedefType* TypedefTy = CurType->getAs<TypedefType>()) {
8120 QualType BaseTy = TypedefTy->desugar();
8122 std::string PrevAccessQual;
8123 if (BaseTy->isPipeType()) {
8124 if (TypedefTy->getDecl()->hasAttr<OpenCLAccessAttr>()) {
8125 OpenCLAccessAttr *Attr =
8126 TypedefTy->getDecl()->getAttr<OpenCLAccessAttr>();
8127 PrevAccessQual = Attr->getSpelling();
8129 PrevAccessQual = "read_only";
8131 } else if (const BuiltinType* ImgType = BaseTy->getAs<BuiltinType>()) {
8133 switch (ImgType->getKind()) {
8134 #define IMAGE_TYPE(ImgType, Id, SingletonId, Access, Suffix) \
8135 case BuiltinType::Id: \
8136 PrevAccessQual = #Access; \
8138 #include "clang/Basic/OpenCLImageTypes.def"
8140 llvm_unreachable("Unable to find corresponding image type.");
8143 llvm_unreachable("unexpected type");
8145 StringRef AttrName = Attr.getAttrName()->getName();
8146 if (PrevAccessQual == AttrName.ltrim("_")) {
8147 // Duplicated qualifiers
8148 S.Diag(Attr.getLoc(), diag::warn_duplicate_declspec)
8149 << AttrName << Attr.getRange();
8151 // Contradicting qualifiers
8152 S.Diag(Attr.getLoc(), diag::err_opencl_multiple_access_qualifiers);
8155 S.Diag(TypedefTy->getDecl()->getBeginLoc(),
8156 diag::note_opencl_typedef_access_qualifier) << PrevAccessQual;
8157 } else if (CurType->isPipeType()) {
8158 if (Attr.getSemanticSpelling() == OpenCLAccessAttr::Keyword_write_only) {
8159 QualType ElemType = CurType->castAs<PipeType>()->getElementType();
8160 CurType = S.Context.getWritePipeType(ElemType);
8165 /// HandleMatrixTypeAttr - "matrix_type" attribute, like ext_vector_type
8166 static void HandleMatrixTypeAttr(QualType &CurType, const ParsedAttr &Attr,
8168 if (!S.getLangOpts().MatrixTypes) {
8169 S.Diag(Attr.getLoc(), diag::err_builtin_matrix_disabled);
8173 if (Attr.getNumArgs() != 2) {
8174 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments)
8179 Expr *RowsExpr = Attr.getArgAsExpr(0);
8180 Expr *ColsExpr = Attr.getArgAsExpr(1);
8181 QualType T = S.BuildMatrixType(CurType, RowsExpr, ColsExpr, Attr.getLoc());
8186 static void HandleAnnotateTypeAttr(TypeProcessingState &State,
8187 QualType &CurType, const ParsedAttr &PA) {
8188 Sema &S = State.getSema();
8190 if (PA.getNumArgs() < 1) {
8191 S.Diag(PA.getLoc(), diag::err_attribute_too_few_arguments) << PA << 1;
8195 // Make sure that there is a string literal as the annotation's first
8198 if (!S.checkStringLiteralArgumentAttr(PA, 0, Str))
8201 llvm::SmallVector<Expr *, 4> Args;
8202 Args.reserve(PA.getNumArgs() - 1);
8203 for (unsigned Idx = 1; Idx < PA.getNumArgs(); Idx++) {
8204 assert(!PA.isArgIdent(Idx));
8205 Args.push_back(PA.getArgAsExpr(Idx));
8207 if (!S.ConstantFoldAttrArgs(PA, Args))
8209 auto *AnnotateTypeAttr =
8210 AnnotateTypeAttr::Create(S.Context, Str, Args.data(), Args.size(), PA);
8211 CurType = State.getAttributedType(AnnotateTypeAttr, CurType, CurType);
8214 static void HandleLifetimeBoundAttr(TypeProcessingState &State,
8217 if (State.getDeclarator().isDeclarationOfFunction()) {
8218 CurType = State.getAttributedType(
8219 createSimpleAttr<LifetimeBoundAttr>(State.getSema().Context, Attr),
8224 static void processTypeAttrs(TypeProcessingState &state, QualType &type,
8225 TypeAttrLocation TAL,
8226 const ParsedAttributesView &attrs) {
8228 state.setParsedNoDeref(false);
8232 // Scan through and apply attributes to this type where it makes sense. Some
8233 // attributes (such as __address_space__, __vector_size__, etc) apply to the
8234 // type, but others can be present in the type specifiers even though they
8235 // apply to the decl. Here we apply type attributes and ignore the rest.
8237 // This loop modifies the list pretty frequently, but we still need to make
8238 // sure we visit every element once. Copy the attributes list, and iterate
8240 ParsedAttributesView AttrsCopy{attrs};
8241 for (ParsedAttr &attr : AttrsCopy) {
8243 // Skip attributes that were marked to be invalid.
8244 if (attr.isInvalid())
8247 if (attr.isStandardAttributeSyntax()) {
8248 // [[gnu::...]] attributes are treated as declaration attributes, so may
8249 // not appertain to a DeclaratorChunk. If we handle them as type
8250 // attributes, accept them in that position and diagnose the GCC
8252 if (attr.isGNUScope()) {
8253 bool IsTypeAttr = attr.isTypeAttr();
8254 if (TAL == TAL_DeclChunk) {
8255 state.getSema().Diag(attr.getLoc(),
8257 ? diag::warn_gcc_ignores_type_attr
8258 : diag::warn_cxx11_gnu_attribute_on_type)
8263 } else if (TAL != TAL_DeclSpec && TAL != TAL_DeclChunk &&
8264 !attr.isTypeAttr()) {
8265 // Otherwise, only consider type processing for a C++11 attribute if
8266 // - it has actually been applied to a type (decl-specifier-seq or
8267 // declarator chunk), or
8268 // - it is a type attribute, irrespective of where it was applied (so
8269 // that we can support the legacy behavior of some type attributes
8270 // that can be applied to the declaration name).
8275 // If this is an attribute we can handle, do so now,
8276 // otherwise, add it to the FnAttrs list for rechaining.
8277 switch (attr.getKind()) {
8279 // A [[]] attribute on a declarator chunk must appertain to a type.
8280 if (attr.isStandardAttributeSyntax() && TAL == TAL_DeclChunk) {
8281 state.getSema().Diag(attr.getLoc(), diag::err_attribute_not_type_attr)
8283 attr.setUsedAsTypeAttr();
8287 case ParsedAttr::UnknownAttribute:
8288 if (attr.isStandardAttributeSyntax()) {
8289 state.getSema().Diag(attr.getLoc(),
8290 diag::warn_unknown_attribute_ignored)
8291 << attr << attr.getRange();
8292 // Mark the attribute as invalid so we don't emit the same diagnostic
8298 case ParsedAttr::IgnoredAttribute:
8301 case ParsedAttr::AT_BTFTypeTag:
8302 HandleBTFTypeTagAttribute(type, attr, state);
8303 attr.setUsedAsTypeAttr();
8306 case ParsedAttr::AT_MayAlias:
8307 // FIXME: This attribute needs to actually be handled, but if we ignore
8308 // it it breaks large amounts of Linux software.
8309 attr.setUsedAsTypeAttr();
8311 case ParsedAttr::AT_OpenCLPrivateAddressSpace:
8312 case ParsedAttr::AT_OpenCLGlobalAddressSpace:
8313 case ParsedAttr::AT_OpenCLGlobalDeviceAddressSpace:
8314 case ParsedAttr::AT_OpenCLGlobalHostAddressSpace:
8315 case ParsedAttr::AT_OpenCLLocalAddressSpace:
8316 case ParsedAttr::AT_OpenCLConstantAddressSpace:
8317 case ParsedAttr::AT_OpenCLGenericAddressSpace:
8318 case ParsedAttr::AT_AddressSpace:
8319 HandleAddressSpaceTypeAttribute(type, attr, state);
8320 attr.setUsedAsTypeAttr();
8322 OBJC_POINTER_TYPE_ATTRS_CASELIST:
8323 if (!handleObjCPointerTypeAttr(state, attr, type))
8324 distributeObjCPointerTypeAttr(state, attr, type);
8325 attr.setUsedAsTypeAttr();
8327 case ParsedAttr::AT_VectorSize:
8328 HandleVectorSizeAttr(type, attr, state.getSema());
8329 attr.setUsedAsTypeAttr();
8331 case ParsedAttr::AT_ExtVectorType:
8332 HandleExtVectorTypeAttr(type, attr, state.getSema());
8333 attr.setUsedAsTypeAttr();
8335 case ParsedAttr::AT_NeonVectorType:
8336 HandleNeonVectorTypeAttr(type, attr, state.getSema(),
8337 VectorType::NeonVector);
8338 attr.setUsedAsTypeAttr();
8340 case ParsedAttr::AT_NeonPolyVectorType:
8341 HandleNeonVectorTypeAttr(type, attr, state.getSema(),
8342 VectorType::NeonPolyVector);
8343 attr.setUsedAsTypeAttr();
8345 case ParsedAttr::AT_ArmSveVectorBits:
8346 HandleArmSveVectorBitsTypeAttr(type, attr, state.getSema());
8347 attr.setUsedAsTypeAttr();
8349 case ParsedAttr::AT_ArmMveStrictPolymorphism: {
8350 HandleArmMveStrictPolymorphismAttr(state, type, attr);
8351 attr.setUsedAsTypeAttr();
8354 case ParsedAttr::AT_OpenCLAccess:
8355 HandleOpenCLAccessAttr(type, attr, state.getSema());
8356 attr.setUsedAsTypeAttr();
8358 case ParsedAttr::AT_LifetimeBound:
8359 if (TAL == TAL_DeclChunk)
8360 HandleLifetimeBoundAttr(state, type, attr);
8363 case ParsedAttr::AT_NoDeref: {
8364 // FIXME: `noderef` currently doesn't work correctly in [[]] syntax.
8365 // See https://github.com/llvm/llvm-project/issues/55790 for details.
8366 // For the time being, we simply emit a warning that the attribute is
8368 if (attr.isStandardAttributeSyntax()) {
8369 state.getSema().Diag(attr.getLoc(), diag::warn_attribute_ignored)
8373 ASTContext &Ctx = state.getSema().Context;
8374 type = state.getAttributedType(createSimpleAttr<NoDerefAttr>(Ctx, attr),
8376 attr.setUsedAsTypeAttr();
8377 state.setParsedNoDeref(true);
8381 case ParsedAttr::AT_MatrixType:
8382 HandleMatrixTypeAttr(type, attr, state.getSema());
8383 attr.setUsedAsTypeAttr();
8386 MS_TYPE_ATTRS_CASELIST:
8387 if (!handleMSPointerTypeQualifierAttr(state, attr, type))
8388 attr.setUsedAsTypeAttr();
8392 NULLABILITY_TYPE_ATTRS_CASELIST:
8393 // Either add nullability here or try to distribute it. We
8394 // don't want to distribute the nullability specifier past any
8395 // dependent type, because that complicates the user model.
8396 if (type->canHaveNullability() || type->isDependentType() ||
8397 type->isArrayType() ||
8398 !distributeNullabilityTypeAttr(state, type, attr)) {
8400 if (TAL == TAL_DeclChunk)
8401 endIndex = state.getCurrentChunkIndex();
8403 endIndex = state.getDeclarator().getNumTypeObjects();
8404 bool allowOnArrayType =
8405 state.getDeclarator().isPrototypeContext() &&
8406 !hasOuterPointerLikeChunk(state.getDeclarator(), endIndex);
8407 if (checkNullabilityTypeSpecifier(
8411 allowOnArrayType)) {
8415 attr.setUsedAsTypeAttr();
8419 case ParsedAttr::AT_ObjCKindOf:
8420 // '__kindof' must be part of the decl-specifiers.
8427 state.getSema().Diag(attr.getLoc(),
8428 diag::err_objc_kindof_wrong_position)
8429 << FixItHint::CreateRemoval(attr.getLoc())
8430 << FixItHint::CreateInsertion(
8431 state.getDeclarator().getDeclSpec().getBeginLoc(),
8436 // Apply it regardless.
8437 if (checkObjCKindOfType(state, type, attr))
8441 case ParsedAttr::AT_NoThrow:
8442 // Exception Specifications aren't generally supported in C mode throughout
8443 // clang, so revert to attribute-based handling for C.
8444 if (!state.getSema().getLangOpts().CPlusPlus)
8447 FUNCTION_TYPE_ATTRS_CASELIST:
8448 attr.setUsedAsTypeAttr();
8450 // Attributes with standard syntax have strict rules for what they
8451 // appertain to and hence should not use the "distribution" logic below.
8452 if (attr.isStandardAttributeSyntax()) {
8453 if (!handleFunctionTypeAttr(state, attr, type)) {
8454 diagnoseBadTypeAttribute(state.getSema(), attr, type);
8460 // Never process function type attributes as part of the
8461 // declaration-specifiers.
8462 if (TAL == TAL_DeclSpec)
8463 distributeFunctionTypeAttrFromDeclSpec(state, attr, type);
8465 // Otherwise, handle the possible delays.
8466 else if (!handleFunctionTypeAttr(state, attr, type))
8467 distributeFunctionTypeAttr(state, attr, type);
8469 case ParsedAttr::AT_AcquireHandle: {
8470 if (!type->isFunctionType())
8473 if (attr.getNumArgs() != 1) {
8474 state.getSema().Diag(attr.getLoc(),
8475 diag::err_attribute_wrong_number_arguments)
8481 StringRef HandleType;
8482 if (!state.getSema().checkStringLiteralArgumentAttr(attr, 0, HandleType))
8484 type = state.getAttributedType(
8485 AcquireHandleAttr::Create(state.getSema().Context, HandleType, attr),
8487 attr.setUsedAsTypeAttr();
8490 case ParsedAttr::AT_AnnotateType: {
8491 HandleAnnotateTypeAttr(state, type, attr);
8492 attr.setUsedAsTypeAttr();
8497 // Handle attributes that are defined in a macro. We do not want this to be
8498 // applied to ObjC builtin attributes.
8499 if (isa<AttributedType>(type) && attr.hasMacroIdentifier() &&
8500 !type.getQualifiers().hasObjCLifetime() &&
8501 !type.getQualifiers().hasObjCGCAttr() &&
8502 attr.getKind() != ParsedAttr::AT_ObjCGC &&
8503 attr.getKind() != ParsedAttr::AT_ObjCOwnership) {
8504 const IdentifierInfo *MacroII = attr.getMacroIdentifier();
8505 type = state.getSema().Context.getMacroQualifiedType(type, MacroII);
8506 state.setExpansionLocForMacroQualifiedType(
8507 cast<MacroQualifiedType>(type.getTypePtr()),
8508 attr.getMacroExpansionLoc());
8513 void Sema::completeExprArrayBound(Expr *E) {
8514 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E->IgnoreParens())) {
8515 if (VarDecl *Var = dyn_cast<VarDecl>(DRE->getDecl())) {
8516 if (isTemplateInstantiation(Var->getTemplateSpecializationKind())) {
8517 auto *Def = Var->getDefinition();
8519 SourceLocation PointOfInstantiation = E->getExprLoc();
8520 runWithSufficientStackSpace(PointOfInstantiation, [&] {
8521 InstantiateVariableDefinition(PointOfInstantiation, Var);
8523 Def = Var->getDefinition();
8525 // If we don't already have a point of instantiation, and we managed
8526 // to instantiate a definition, this is the point of instantiation.
8527 // Otherwise, we don't request an end-of-TU instantiation, so this is
8528 // not a point of instantiation.
8529 // FIXME: Is this really the right behavior?
8530 if (Var->getPointOfInstantiation().isInvalid() && Def) {
8531 assert(Var->getTemplateSpecializationKind() ==
8532 TSK_ImplicitInstantiation &&
8533 "explicit instantiation with no point of instantiation");
8534 Var->setTemplateSpecializationKind(
8535 Var->getTemplateSpecializationKind(), PointOfInstantiation);
8539 // Update the type to the definition's type both here and within the
8543 QualType T = Def->getType();
8545 // FIXME: Update the type on all intervening expressions.
8549 // We still go on to try to complete the type independently, as it
8550 // may also require instantiations or diagnostics if it remains
8557 QualType Sema::getCompletedType(Expr *E) {
8558 // Incomplete array types may be completed by the initializer attached to
8559 // their definitions. For static data members of class templates and for
8560 // variable templates, we need to instantiate the definition to get this
8561 // initializer and complete the type.
8562 if (E->getType()->isIncompleteArrayType())
8563 completeExprArrayBound(E);
8565 // FIXME: Are there other cases which require instantiating something other
8566 // than the type to complete the type of an expression?
8568 return E->getType();
8571 /// Ensure that the type of the given expression is complete.
8573 /// This routine checks whether the expression \p E has a complete type. If the
8574 /// expression refers to an instantiable construct, that instantiation is
8575 /// performed as needed to complete its type. Furthermore
8576 /// Sema::RequireCompleteType is called for the expression's type (or in the
8577 /// case of a reference type, the referred-to type).
8579 /// \param E The expression whose type is required to be complete.
8580 /// \param Kind Selects which completeness rules should be applied.
8581 /// \param Diagnoser The object that will emit a diagnostic if the type is
8584 /// \returns \c true if the type of \p E is incomplete and diagnosed, \c false
8586 bool Sema::RequireCompleteExprType(Expr *E, CompleteTypeKind Kind,
8587 TypeDiagnoser &Diagnoser) {
8588 return RequireCompleteType(E->getExprLoc(), getCompletedType(E), Kind,
8592 bool Sema::RequireCompleteExprType(Expr *E, unsigned DiagID) {
8593 BoundTypeDiagnoser<> Diagnoser(DiagID);
8594 return RequireCompleteExprType(E, CompleteTypeKind::Default, Diagnoser);
8597 /// Ensure that the type T is a complete type.
8599 /// This routine checks whether the type @p T is complete in any
8600 /// context where a complete type is required. If @p T is a complete
8601 /// type, returns false. If @p T is a class template specialization,
8602 /// this routine then attempts to perform class template
8603 /// instantiation. If instantiation fails, or if @p T is incomplete
8604 /// and cannot be completed, issues the diagnostic @p diag (giving it
8605 /// the type @p T) and returns true.
8607 /// @param Loc The location in the source that the incomplete type
8608 /// diagnostic should refer to.
8610 /// @param T The type that this routine is examining for completeness.
8612 /// @param Kind Selects which completeness rules should be applied.
8614 /// @returns @c true if @p T is incomplete and a diagnostic was emitted,
8615 /// @c false otherwise.
8616 bool Sema::RequireCompleteType(SourceLocation Loc, QualType T,
8617 CompleteTypeKind Kind,
8618 TypeDiagnoser &Diagnoser) {
8619 if (RequireCompleteTypeImpl(Loc, T, Kind, &Diagnoser))
8621 if (const TagType *Tag = T->getAs<TagType>()) {
8622 if (!Tag->getDecl()->isCompleteDefinitionRequired()) {
8623 Tag->getDecl()->setCompleteDefinitionRequired();
8624 Consumer.HandleTagDeclRequiredDefinition(Tag->getDecl());
8630 bool Sema::hasStructuralCompatLayout(Decl *D, Decl *Suggested) {
8631 llvm::DenseSet<std::pair<Decl *, Decl *>> NonEquivalentDecls;
8635 // FIXME: Add a specific mode for C11 6.2.7/1 in StructuralEquivalenceContext
8636 // and isolate from other C++ specific checks.
8637 StructuralEquivalenceContext Ctx(
8638 D->getASTContext(), Suggested->getASTContext(), NonEquivalentDecls,
8639 StructuralEquivalenceKind::Default,
8640 false /*StrictTypeSpelling*/, true /*Complain*/,
8641 true /*ErrorOnTagTypeMismatch*/);
8642 return Ctx.IsEquivalent(D, Suggested);
8645 bool Sema::hasAcceptableDefinition(NamedDecl *D, NamedDecl **Suggested,
8646 AcceptableKind Kind, bool OnlyNeedComplete) {
8647 // Easy case: if we don't have modules, all declarations are visible.
8648 if (!getLangOpts().Modules && !getLangOpts().ModulesLocalVisibility)
8651 // If this definition was instantiated from a template, map back to the
8652 // pattern from which it was instantiated.
8653 if (isa<TagDecl>(D) && cast<TagDecl>(D)->isBeingDefined()) {
8654 // We're in the middle of defining it; this definition should be treated
8657 } else if (auto *RD = dyn_cast<CXXRecordDecl>(D)) {
8658 if (auto *Pattern = RD->getTemplateInstantiationPattern())
8660 D = RD->getDefinition();
8661 } else if (auto *ED = dyn_cast<EnumDecl>(D)) {
8662 if (auto *Pattern = ED->getTemplateInstantiationPattern())
8664 if (OnlyNeedComplete && (ED->isFixed() || getLangOpts().MSVCCompat)) {
8665 // If the enum has a fixed underlying type, it may have been forward
8666 // declared. In -fms-compatibility, `enum Foo;` will also forward declare
8667 // the enum and assign it the underlying type of `int`. Since we're only
8668 // looking for a complete type (not a definition), any visible declaration
8670 *Suggested = nullptr;
8671 for (auto *Redecl : ED->redecls()) {
8672 if (isAcceptable(Redecl, Kind))
8674 if (Redecl->isThisDeclarationADefinition() ||
8675 (Redecl->isCanonicalDecl() && !*Suggested))
8676 *Suggested = Redecl;
8681 D = ED->getDefinition();
8682 } else if (auto *FD = dyn_cast<FunctionDecl>(D)) {
8683 if (auto *Pattern = FD->getTemplateInstantiationPattern())
8685 D = FD->getDefinition();
8686 } else if (auto *VD = dyn_cast<VarDecl>(D)) {
8687 if (auto *Pattern = VD->getTemplateInstantiationPattern())
8689 D = VD->getDefinition();
8692 assert(D && "missing definition for pattern of instantiated definition");
8696 auto DefinitionIsAcceptable = [&] {
8697 // The (primary) definition might be in a visible module.
8698 if (isAcceptable(D, Kind))
8701 // A visible module might have a merged definition instead.
8702 if (D->isModulePrivate() ? hasMergedDefinitionInCurrentModule(D)
8703 : hasVisibleMergedDefinition(D)) {
8704 if (CodeSynthesisContexts.empty() &&
8705 !getLangOpts().ModulesLocalVisibility) {
8706 // Cache the fact that this definition is implicitly visible because
8707 // there is a visible merged definition.
8708 D->setVisibleDespiteOwningModule();
8716 if (DefinitionIsAcceptable())
8719 // The external source may have additional definitions of this entity that are
8720 // visible, so complete the redeclaration chain now and ask again.
8721 if (auto *Source = Context.getExternalSource()) {
8722 Source->CompleteRedeclChain(D);
8723 return DefinitionIsAcceptable();
8729 /// Determine whether there is any declaration of \p D that was ever a
8730 /// definition (perhaps before module merging) and is currently visible.
8731 /// \param D The definition of the entity.
8732 /// \param Suggested Filled in with the declaration that should be made visible
8733 /// in order to provide a definition of this entity.
8734 /// \param OnlyNeedComplete If \c true, we only need the type to be complete,
8735 /// not defined. This only matters for enums with a fixed underlying
8736 /// type, since in all other cases, a type is complete if and only if it
8738 bool Sema::hasVisibleDefinition(NamedDecl *D, NamedDecl **Suggested,
8739 bool OnlyNeedComplete) {
8740 return hasAcceptableDefinition(D, Suggested, Sema::AcceptableKind::Visible,
8744 /// Determine whether there is any declaration of \p D that was ever a
8745 /// definition (perhaps before module merging) and is currently
8747 /// \param D The definition of the entity.
8748 /// \param Suggested Filled in with the declaration that should be made
8750 /// in order to provide a definition of this entity.
8751 /// \param OnlyNeedComplete If \c true, we only need the type to be complete,
8752 /// not defined. This only matters for enums with a fixed underlying
8753 /// type, since in all other cases, a type is complete if and only if it
8755 bool Sema::hasReachableDefinition(NamedDecl *D, NamedDecl **Suggested,
8756 bool OnlyNeedComplete) {
8757 return hasAcceptableDefinition(D, Suggested, Sema::AcceptableKind::Reachable,
8761 /// Locks in the inheritance model for the given class and all of its bases.
8762 static void assignInheritanceModel(Sema &S, CXXRecordDecl *RD) {
8763 RD = RD->getMostRecentNonInjectedDecl();
8764 if (!RD->hasAttr<MSInheritanceAttr>()) {
8765 MSInheritanceModel IM;
8766 bool BestCase = false;
8767 switch (S.MSPointerToMemberRepresentationMethod) {
8768 case LangOptions::PPTMK_BestCase:
8770 IM = RD->calculateInheritanceModel();
8772 case LangOptions::PPTMK_FullGeneralitySingleInheritance:
8773 IM = MSInheritanceModel::Single;
8775 case LangOptions::PPTMK_FullGeneralityMultipleInheritance:
8776 IM = MSInheritanceModel::Multiple;
8778 case LangOptions::PPTMK_FullGeneralityVirtualInheritance:
8779 IM = MSInheritanceModel::Unspecified;
8783 SourceRange Loc = S.ImplicitMSInheritanceAttrLoc.isValid()
8784 ? S.ImplicitMSInheritanceAttrLoc
8785 : RD->getSourceRange();
8786 RD->addAttr(MSInheritanceAttr::CreateImplicit(
8787 S.getASTContext(), BestCase, Loc, AttributeCommonInfo::AS_Microsoft,
8788 MSInheritanceAttr::Spelling(IM)));
8789 S.Consumer.AssignInheritanceModel(RD);
8793 /// The implementation of RequireCompleteType
8794 bool Sema::RequireCompleteTypeImpl(SourceLocation Loc, QualType T,
8795 CompleteTypeKind Kind,
8796 TypeDiagnoser *Diagnoser) {
8797 // FIXME: Add this assertion to make sure we always get instantiation points.
8798 // assert(!Loc.isInvalid() && "Invalid location in RequireCompleteType");
8799 // FIXME: Add this assertion to help us flush out problems with
8800 // checking for dependent types and type-dependent expressions.
8802 // assert(!T->isDependentType() &&
8803 // "Can't ask whether a dependent type is complete");
8805 if (const MemberPointerType *MPTy = T->getAs<MemberPointerType>()) {
8806 if (!MPTy->getClass()->isDependentType()) {
8807 if (getLangOpts().CompleteMemberPointers &&
8808 !MPTy->getClass()->getAsCXXRecordDecl()->isBeingDefined() &&
8809 RequireCompleteType(Loc, QualType(MPTy->getClass(), 0), Kind,
8810 diag::err_memptr_incomplete))
8813 // We lock in the inheritance model once somebody has asked us to ensure
8814 // that a pointer-to-member type is complete.
8815 if (Context.getTargetInfo().getCXXABI().isMicrosoft()) {
8816 (void)isCompleteType(Loc, QualType(MPTy->getClass(), 0));
8817 assignInheritanceModel(*this, MPTy->getMostRecentCXXRecordDecl());
8822 NamedDecl *Def = nullptr;
8823 bool AcceptSizeless = (Kind == CompleteTypeKind::AcceptSizeless);
8824 bool Incomplete = (T->isIncompleteType(&Def) ||
8825 (!AcceptSizeless && T->isSizelessBuiltinType()));
8827 // Check that any necessary explicit specializations are visible. For an
8828 // enum, we just need the declaration, so don't check this.
8829 if (Def && !isa<EnumDecl>(Def))
8830 checkSpecializationReachability(Loc, Def);
8832 // If we have a complete type, we're done.
8834 NamedDecl *Suggested = nullptr;
8836 !hasReachableDefinition(Def, &Suggested, /*OnlyNeedComplete=*/true)) {
8837 // If the user is going to see an error here, recover by making the
8838 // definition visible.
8839 bool TreatAsComplete = Diagnoser && !isSFINAEContext();
8840 if (Diagnoser && Suggested)
8841 diagnoseMissingImport(Loc, Suggested, MissingImportKind::Definition,
8842 /*Recover*/ TreatAsComplete);
8843 return !TreatAsComplete;
8844 } else if (Def && !TemplateInstCallbacks.empty()) {
8845 CodeSynthesisContext TempInst;
8846 TempInst.Kind = CodeSynthesisContext::Memoization;
8847 TempInst.Template = Def;
8848 TempInst.Entity = Def;
8849 TempInst.PointOfInstantiation = Loc;
8850 atTemplateBegin(TemplateInstCallbacks, *this, TempInst);
8851 atTemplateEnd(TemplateInstCallbacks, *this, TempInst);
8857 TagDecl *Tag = dyn_cast_or_null<TagDecl>(Def);
8858 ObjCInterfaceDecl *IFace = dyn_cast_or_null<ObjCInterfaceDecl>(Def);
8860 // Give the external source a chance to provide a definition of the type.
8861 // This is kept separate from completing the redeclaration chain so that
8862 // external sources such as LLDB can avoid synthesizing a type definition
8863 // unless it's actually needed.
8865 // Avoid diagnosing invalid decls as incomplete.
8866 if (Def->isInvalidDecl())
8869 // Give the external AST source a chance to complete the type.
8870 if (auto *Source = Context.getExternalSource()) {
8871 if (Tag && Tag->hasExternalLexicalStorage())
8872 Source->CompleteType(Tag);
8873 if (IFace && IFace->hasExternalLexicalStorage())
8874 Source->CompleteType(IFace);
8875 // If the external source completed the type, go through the motions
8876 // again to ensure we're allowed to use the completed type.
8877 if (!T->isIncompleteType())
8878 return RequireCompleteTypeImpl(Loc, T, Kind, Diagnoser);
8882 // If we have a class template specialization or a class member of a
8883 // class template specialization, or an array with known size of such,
8884 // try to instantiate it.
8885 if (auto *RD = dyn_cast_or_null<CXXRecordDecl>(Tag)) {
8886 bool Instantiated = false;
8887 bool Diagnosed = false;
8888 if (RD->isDependentContext()) {
8889 // Don't try to instantiate a dependent class (eg, a member template of
8890 // an instantiated class template specialization).
8891 // FIXME: Can this ever happen?
8892 } else if (auto *ClassTemplateSpec =
8893 dyn_cast<ClassTemplateSpecializationDecl>(RD)) {
8894 if (ClassTemplateSpec->getSpecializationKind() == TSK_Undeclared) {
8895 runWithSufficientStackSpace(Loc, [&] {
8896 Diagnosed = InstantiateClassTemplateSpecialization(
8897 Loc, ClassTemplateSpec, TSK_ImplicitInstantiation,
8898 /*Complain=*/Diagnoser);
8900 Instantiated = true;
8903 CXXRecordDecl *Pattern = RD->getInstantiatedFromMemberClass();
8904 if (!RD->isBeingDefined() && Pattern) {
8905 MemberSpecializationInfo *MSI = RD->getMemberSpecializationInfo();
8906 assert(MSI && "Missing member specialization information?");
8907 // This record was instantiated from a class within a template.
8908 if (MSI->getTemplateSpecializationKind() !=
8909 TSK_ExplicitSpecialization) {
8910 runWithSufficientStackSpace(Loc, [&] {
8911 Diagnosed = InstantiateClass(Loc, RD, Pattern,
8912 getTemplateInstantiationArgs(RD),
8913 TSK_ImplicitInstantiation,
8914 /*Complain=*/Diagnoser);
8916 Instantiated = true;
8922 // Instantiate* might have already complained that the template is not
8923 // defined, if we asked it to.
8924 if (Diagnoser && Diagnosed)
8926 // If we instantiated a definition, check that it's usable, even if
8927 // instantiation produced an error, so that repeated calls to this
8928 // function give consistent answers.
8929 if (!T->isIncompleteType())
8930 return RequireCompleteTypeImpl(Loc, T, Kind, Diagnoser);
8934 // FIXME: If we didn't instantiate a definition because of an explicit
8935 // specialization declaration, check that it's visible.
8940 Diagnoser->diagnose(*this, Loc, T);
8942 // If the type was a forward declaration of a class/struct/union
8943 // type, produce a note.
8944 if (Tag && !Tag->isInvalidDecl() && !Tag->getLocation().isInvalid())
8945 Diag(Tag->getLocation(),
8946 Tag->isBeingDefined() ? diag::note_type_being_defined
8947 : diag::note_forward_declaration)
8948 << Context.getTagDeclType(Tag);
8950 // If the Objective-C class was a forward declaration, produce a note.
8951 if (IFace && !IFace->isInvalidDecl() && !IFace->getLocation().isInvalid())
8952 Diag(IFace->getLocation(), diag::note_forward_class);
8954 // If we have external information that we can use to suggest a fix,
8957 ExternalSource->MaybeDiagnoseMissingCompleteType(Loc, T);
8962 bool Sema::RequireCompleteType(SourceLocation Loc, QualType T,
8963 CompleteTypeKind Kind, unsigned DiagID) {
8964 BoundTypeDiagnoser<> Diagnoser(DiagID);
8965 return RequireCompleteType(Loc, T, Kind, Diagnoser);
8968 /// Get diagnostic %select index for tag kind for
8969 /// literal type diagnostic message.
8970 /// WARNING: Indexes apply to particular diagnostics only!
8972 /// \returns diagnostic %select index.
8973 static unsigned getLiteralDiagFromTagKind(TagTypeKind Tag) {
8975 case TTK_Struct: return 0;
8976 case TTK_Interface: return 1;
8977 case TTK_Class: return 2;
8978 default: llvm_unreachable("Invalid tag kind for literal type diagnostic!");
8982 /// Ensure that the type T is a literal type.
8984 /// This routine checks whether the type @p T is a literal type. If @p T is an
8985 /// incomplete type, an attempt is made to complete it. If @p T is a literal
8986 /// type, or @p AllowIncompleteType is true and @p T is an incomplete type,
8987 /// returns false. Otherwise, this routine issues the diagnostic @p PD (giving
8988 /// it the type @p T), along with notes explaining why the type is not a
8989 /// literal type, and returns true.
8991 /// @param Loc The location in the source that the non-literal type
8992 /// diagnostic should refer to.
8994 /// @param T The type that this routine is examining for literalness.
8996 /// @param Diagnoser Emits a diagnostic if T is not a literal type.
8998 /// @returns @c true if @p T is not a literal type and a diagnostic was emitted,
8999 /// @c false otherwise.
9000 bool Sema::RequireLiteralType(SourceLocation Loc, QualType T,
9001 TypeDiagnoser &Diagnoser) {
9002 assert(!T->isDependentType() && "type should not be dependent");
9004 QualType ElemType = Context.getBaseElementType(T);
9005 if ((isCompleteType(Loc, ElemType) || ElemType->isVoidType()) &&
9006 T->isLiteralType(Context))
9009 Diagnoser.diagnose(*this, Loc, T);
9011 if (T->isVariableArrayType())
9014 const RecordType *RT = ElemType->getAs<RecordType>();
9018 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl());
9020 // A partially-defined class type can't be a literal type, because a literal
9021 // class type must have a trivial destructor (which can't be checked until
9022 // the class definition is complete).
9023 if (RequireCompleteType(Loc, ElemType, diag::note_non_literal_incomplete, T))
9026 // [expr.prim.lambda]p3:
9027 // This class type is [not] a literal type.
9028 if (RD->isLambda() && !getLangOpts().CPlusPlus17) {
9029 Diag(RD->getLocation(), diag::note_non_literal_lambda);
9033 // If the class has virtual base classes, then it's not an aggregate, and
9034 // cannot have any constexpr constructors or a trivial default constructor,
9035 // so is non-literal. This is better to diagnose than the resulting absence
9036 // of constexpr constructors.
9037 if (RD->getNumVBases()) {
9038 Diag(RD->getLocation(), diag::note_non_literal_virtual_base)
9039 << getLiteralDiagFromTagKind(RD->getTagKind()) << RD->getNumVBases();
9040 for (const auto &I : RD->vbases())
9041 Diag(I.getBeginLoc(), diag::note_constexpr_virtual_base_here)
9042 << I.getSourceRange();
9043 } else if (!RD->isAggregate() && !RD->hasConstexprNonCopyMoveConstructor() &&
9044 !RD->hasTrivialDefaultConstructor()) {
9045 Diag(RD->getLocation(), diag::note_non_literal_no_constexpr_ctors) << RD;
9046 } else if (RD->hasNonLiteralTypeFieldsOrBases()) {
9047 for (const auto &I : RD->bases()) {
9048 if (!I.getType()->isLiteralType(Context)) {
9049 Diag(I.getBeginLoc(), diag::note_non_literal_base_class)
9050 << RD << I.getType() << I.getSourceRange();
9054 for (const auto *I : RD->fields()) {
9055 if (!I->getType()->isLiteralType(Context) ||
9056 I->getType().isVolatileQualified()) {
9057 Diag(I->getLocation(), diag::note_non_literal_field)
9058 << RD << I << I->getType()
9059 << I->getType().isVolatileQualified();
9063 } else if (getLangOpts().CPlusPlus20 ? !RD->hasConstexprDestructor()
9064 : !RD->hasTrivialDestructor()) {
9065 // All fields and bases are of literal types, so have trivial or constexpr
9066 // destructors. If this class's destructor is non-trivial / non-constexpr,
9067 // it must be user-declared.
9068 CXXDestructorDecl *Dtor = RD->getDestructor();
9069 assert(Dtor && "class has literal fields and bases but no dtor?");
9073 if (getLangOpts().CPlusPlus20) {
9074 Diag(Dtor->getLocation(), diag::note_non_literal_non_constexpr_dtor)
9077 Diag(Dtor->getLocation(), Dtor->isUserProvided()
9078 ? diag::note_non_literal_user_provided_dtor
9079 : diag::note_non_literal_nontrivial_dtor)
9081 if (!Dtor->isUserProvided())
9082 SpecialMemberIsTrivial(Dtor, CXXDestructor, TAH_IgnoreTrivialABI,
9090 bool Sema::RequireLiteralType(SourceLocation Loc, QualType T, unsigned DiagID) {
9091 BoundTypeDiagnoser<> Diagnoser(DiagID);
9092 return RequireLiteralType(Loc, T, Diagnoser);
9095 /// Retrieve a version of the type 'T' that is elaborated by Keyword, qualified
9096 /// by the nested-name-specifier contained in SS, and that is (re)declared by
9097 /// OwnedTagDecl, which is nullptr if this is not a (re)declaration.
9098 QualType Sema::getElaboratedType(ElaboratedTypeKeyword Keyword,
9099 const CXXScopeSpec &SS, QualType T,
9100 TagDecl *OwnedTagDecl) {
9103 NestedNameSpecifier *NNS;
9105 NNS = SS.getScopeRep();
9107 if (Keyword == ETK_None)
9111 return Context.getElaboratedType(Keyword, NNS, T, OwnedTagDecl);
9114 QualType Sema::BuildTypeofExprType(Expr *E) {
9115 assert(!E->hasPlaceholderType() && "unexpected placeholder");
9117 if (!getLangOpts().CPlusPlus && E->refersToBitField())
9118 Diag(E->getExprLoc(), diag::err_sizeof_alignof_typeof_bitfield) << 2;
9120 if (!E->isTypeDependent()) {
9121 QualType T = E->getType();
9122 if (const TagType *TT = T->getAs<TagType>())
9123 DiagnoseUseOfDecl(TT->getDecl(), E->getExprLoc());
9125 return Context.getTypeOfExprType(E);
9128 /// getDecltypeForExpr - Given an expr, will return the decltype for
9129 /// that expression, according to the rules in C++11
9130 /// [dcl.type.simple]p4 and C++11 [expr.lambda.prim]p18.
9131 QualType Sema::getDecltypeForExpr(Expr *E) {
9132 if (E->isTypeDependent())
9133 return Context.DependentTy;
9136 if (auto *ImplCastExpr = dyn_cast<ImplicitCastExpr>(E))
9137 IDExpr = ImplCastExpr->getSubExpr();
9139 // C++11 [dcl.type.simple]p4:
9140 // The type denoted by decltype(e) is defined as follows:
9143 // - if E is an unparenthesized id-expression naming a non-type
9144 // template-parameter (13.2), decltype(E) is the type of the
9145 // template-parameter after performing any necessary type deduction
9146 // Note that this does not pick up the implicit 'const' for a template
9147 // parameter object. This rule makes no difference before C++20 so we apply
9148 // it unconditionally.
9149 if (const auto *SNTTPE = dyn_cast<SubstNonTypeTemplateParmExpr>(IDExpr))
9150 return SNTTPE->getParameterType(Context);
9152 // - if e is an unparenthesized id-expression or an unparenthesized class
9153 // member access (5.2.5), decltype(e) is the type of the entity named
9154 // by e. If there is no such entity, or if e names a set of overloaded
9155 // functions, the program is ill-formed;
9157 // We apply the same rules for Objective-C ivar and property references.
9158 if (const auto *DRE = dyn_cast<DeclRefExpr>(IDExpr)) {
9159 const ValueDecl *VD = DRE->getDecl();
9160 QualType T = VD->getType();
9161 return isa<TemplateParamObjectDecl>(VD) ? T.getUnqualifiedType() : T;
9163 if (const auto *ME = dyn_cast<MemberExpr>(IDExpr)) {
9164 if (const auto *VD = ME->getMemberDecl())
9165 if (isa<FieldDecl>(VD) || isa<VarDecl>(VD))
9166 return VD->getType();
9167 } else if (const auto *IR = dyn_cast<ObjCIvarRefExpr>(IDExpr)) {
9168 return IR->getDecl()->getType();
9169 } else if (const auto *PR = dyn_cast<ObjCPropertyRefExpr>(IDExpr)) {
9170 if (PR->isExplicitProperty())
9171 return PR->getExplicitProperty()->getType();
9172 } else if (const auto *PE = dyn_cast<PredefinedExpr>(IDExpr)) {
9173 return PE->getType();
9176 // C++11 [expr.lambda.prim]p18:
9177 // Every occurrence of decltype((x)) where x is a possibly
9178 // parenthesized id-expression that names an entity of automatic
9179 // storage duration is treated as if x were transformed into an
9180 // access to a corresponding data member of the closure type that
9181 // would have been declared if x were an odr-use of the denoted
9183 if (getCurLambda() && isa<ParenExpr>(IDExpr)) {
9184 if (auto *DRE = dyn_cast<DeclRefExpr>(IDExpr->IgnoreParens())) {
9185 if (auto *Var = dyn_cast<VarDecl>(DRE->getDecl())) {
9186 QualType T = getCapturedDeclRefType(Var, DRE->getLocation());
9188 return Context.getLValueReferenceType(T);
9193 return Context.getReferenceQualifiedType(E);
9196 QualType Sema::BuildDecltypeType(Expr *E, bool AsUnevaluated) {
9197 assert(!E->hasPlaceholderType() && "unexpected placeholder");
9199 if (AsUnevaluated && CodeSynthesisContexts.empty() &&
9200 !E->isInstantiationDependent() && E->HasSideEffects(Context, false)) {
9201 // The expression operand for decltype is in an unevaluated expression
9202 // context, so side effects could result in unintended consequences.
9203 // Exclude instantiation-dependent expressions, because 'decltype' is often
9204 // used to build SFINAE gadgets.
9205 Diag(E->getExprLoc(), diag::warn_side_effects_unevaluated_context);
9207 return Context.getDecltypeType(E, getDecltypeForExpr(E));
9210 QualType Sema::BuildUnaryTransformType(QualType BaseType,
9211 UnaryTransformType::UTTKind UKind,
9212 SourceLocation Loc) {
9214 case UnaryTransformType::EnumUnderlyingType:
9215 if (!BaseType->isDependentType() && !BaseType->isEnumeralType()) {
9216 Diag(Loc, diag::err_only_enums_have_underlying_types);
9219 QualType Underlying = BaseType;
9220 if (!BaseType->isDependentType()) {
9221 // The enum could be incomplete if we're parsing its definition or
9222 // recovering from an error.
9223 NamedDecl *FwdDecl = nullptr;
9224 if (BaseType->isIncompleteType(&FwdDecl)) {
9225 Diag(Loc, diag::err_underlying_type_of_incomplete_enum) << BaseType;
9226 Diag(FwdDecl->getLocation(), diag::note_forward_declaration) << FwdDecl;
9230 EnumDecl *ED = BaseType->castAs<EnumType>()->getDecl();
9231 assert(ED && "EnumType has no EnumDecl");
9233 DiagnoseUseOfDecl(ED, Loc);
9235 Underlying = ED->getIntegerType();
9236 assert(!Underlying.isNull());
9238 return Context.getUnaryTransformType(BaseType, Underlying,
9239 UnaryTransformType::EnumUnderlyingType);
9242 llvm_unreachable("unknown unary transform type");
9245 QualType Sema::BuildAtomicType(QualType T, SourceLocation Loc) {
9246 if (!isDependentOrGNUAutoType(T)) {
9247 // FIXME: It isn't entirely clear whether incomplete atomic types
9248 // are allowed or not; for simplicity, ban them for the moment.
9249 if (RequireCompleteType(Loc, T, diag::err_atomic_specifier_bad_type, 0))
9252 int DisallowedKind = -1;
9253 if (T->isArrayType())
9255 else if (T->isFunctionType())
9257 else if (T->isReferenceType())
9259 else if (T->isAtomicType())
9261 else if (T.hasQualifiers())
9263 else if (T->isSizelessType())
9265 else if (!T.isTriviallyCopyableType(Context))
9266 // Some other non-trivially-copyable type (probably a C++ class)
9268 else if (T->isBitIntType())
9271 if (DisallowedKind != -1) {
9272 Diag(Loc, diag::err_atomic_specifier_bad_type) << DisallowedKind << T;
9276 // FIXME: Do we need any handling for ARC here?
9279 // Build the pointer type.
9280 return Context.getAtomicType(T);