1 //===--- SemaType.cpp - Semantic Analysis for Types -----------------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file implements type-related semantic analysis.
12 //===----------------------------------------------------------------------===//
14 #include "clang/Sema/ScopeInfo.h"
15 #include "clang/Sema/SemaInternal.h"
16 #include "clang/Sema/Template.h"
17 #include "clang/Basic/OpenCL.h"
18 #include "clang/AST/ASTContext.h"
19 #include "clang/AST/ASTMutationListener.h"
20 #include "clang/AST/CXXInheritance.h"
21 #include "clang/AST/DeclObjC.h"
22 #include "clang/AST/DeclTemplate.h"
23 #include "clang/AST/TypeLoc.h"
24 #include "clang/AST/TypeLocVisitor.h"
25 #include "clang/AST/Expr.h"
26 #include "clang/Basic/PartialDiagnostic.h"
27 #include "clang/Basic/TargetInfo.h"
28 #include "clang/Lex/Preprocessor.h"
29 #include "clang/Parse/ParseDiagnostic.h"
30 #include "clang/Sema/DeclSpec.h"
31 #include "clang/Sema/DelayedDiagnostic.h"
32 #include "clang/Sema/Lookup.h"
33 #include "llvm/ADT/SmallPtrSet.h"
34 #include "llvm/Support/ErrorHandling.h"
35 using namespace clang;
37 /// isOmittedBlockReturnType - Return true if this declarator is missing a
38 /// return type because this is a omitted return type on a block literal.
39 static bool isOmittedBlockReturnType(const Declarator &D) {
40 if (D.getContext() != Declarator::BlockLiteralContext ||
41 D.getDeclSpec().hasTypeSpecifier())
44 if (D.getNumTypeObjects() == 0)
45 return true; // ^{ ... }
47 if (D.getNumTypeObjects() == 1 &&
48 D.getTypeObject(0).Kind == DeclaratorChunk::Function)
49 return true; // ^(int X, float Y) { ... }
54 /// diagnoseBadTypeAttribute - Diagnoses a type attribute which
55 /// doesn't apply to the given type.
56 static void diagnoseBadTypeAttribute(Sema &S, const AttributeList &attr,
58 bool useExpansionLoc = false;
61 switch (attr.getKind()) {
62 case AttributeList::AT_objc_gc:
63 diagID = diag::warn_pointer_attribute_wrong_type;
64 useExpansionLoc = true;
67 case AttributeList::AT_objc_ownership:
68 diagID = diag::warn_objc_object_attribute_wrong_type;
69 useExpansionLoc = true;
73 // Assume everything else was a function attribute.
74 diagID = diag::warn_function_attribute_wrong_type;
78 SourceLocation loc = attr.getLoc();
79 StringRef name = attr.getName()->getName();
81 // The GC attributes are usually written with macros; special-case them.
82 if (useExpansionLoc && loc.isMacroID() && attr.getParameterName()) {
83 if (attr.getParameterName()->isStr("strong")) {
84 if (S.findMacroSpelling(loc, "__strong")) name = "__strong";
85 } else if (attr.getParameterName()->isStr("weak")) {
86 if (S.findMacroSpelling(loc, "__weak")) name = "__weak";
90 S.Diag(loc, diagID) << name << type;
93 // objc_gc applies to Objective-C pointers or, otherwise, to the
94 // smallest available pointer type (i.e. 'void*' in 'void**').
95 #define OBJC_POINTER_TYPE_ATTRS_CASELIST \
96 case AttributeList::AT_objc_gc: \
97 case AttributeList::AT_objc_ownership
99 // Function type attributes.
100 #define FUNCTION_TYPE_ATTRS_CASELIST \
101 case AttributeList::AT_noreturn: \
102 case AttributeList::AT_cdecl: \
103 case AttributeList::AT_fastcall: \
104 case AttributeList::AT_stdcall: \
105 case AttributeList::AT_thiscall: \
106 case AttributeList::AT_pascal: \
107 case AttributeList::AT_regparm: \
108 case AttributeList::AT_pcs \
111 /// An object which stores processing state for the entire
112 /// GetTypeForDeclarator process.
113 class TypeProcessingState {
116 /// The declarator being processed.
117 Declarator &declarator;
119 /// The index of the declarator chunk we're currently processing.
120 /// May be the total number of valid chunks, indicating the
124 /// Whether there are non-trivial modifications to the decl spec.
127 /// Whether we saved the attributes in the decl spec.
130 /// The original set of attributes on the DeclSpec.
131 SmallVector<AttributeList*, 2> savedAttrs;
133 /// A list of attributes to diagnose the uselessness of when the
134 /// processing is complete.
135 SmallVector<AttributeList*, 2> ignoredTypeAttrs;
138 TypeProcessingState(Sema &sema, Declarator &declarator)
139 : sema(sema), declarator(declarator),
140 chunkIndex(declarator.getNumTypeObjects()),
141 trivial(true), hasSavedAttrs(false) {}
143 Sema &getSema() const {
147 Declarator &getDeclarator() const {
151 unsigned getCurrentChunkIndex() const {
155 void setCurrentChunkIndex(unsigned idx) {
156 assert(idx <= declarator.getNumTypeObjects());
160 AttributeList *&getCurrentAttrListRef() const {
161 assert(chunkIndex <= declarator.getNumTypeObjects());
162 if (chunkIndex == declarator.getNumTypeObjects())
163 return getMutableDeclSpec().getAttributes().getListRef();
164 return declarator.getTypeObject(chunkIndex).getAttrListRef();
167 /// Save the current set of attributes on the DeclSpec.
168 void saveDeclSpecAttrs() {
169 // Don't try to save them multiple times.
170 if (hasSavedAttrs) return;
172 DeclSpec &spec = getMutableDeclSpec();
173 for (AttributeList *attr = spec.getAttributes().getList(); attr;
174 attr = attr->getNext())
175 savedAttrs.push_back(attr);
176 trivial &= savedAttrs.empty();
177 hasSavedAttrs = true;
180 /// Record that we had nowhere to put the given type attribute.
181 /// We will diagnose such attributes later.
182 void addIgnoredTypeAttr(AttributeList &attr) {
183 ignoredTypeAttrs.push_back(&attr);
186 /// Diagnose all the ignored type attributes, given that the
187 /// declarator worked out to the given type.
188 void diagnoseIgnoredTypeAttrs(QualType type) const {
189 for (SmallVectorImpl<AttributeList*>::const_iterator
190 i = ignoredTypeAttrs.begin(), e = ignoredTypeAttrs.end();
192 diagnoseBadTypeAttribute(getSema(), **i, type);
195 ~TypeProcessingState() {
198 restoreDeclSpecAttrs();
202 DeclSpec &getMutableDeclSpec() const {
203 return const_cast<DeclSpec&>(declarator.getDeclSpec());
206 void restoreDeclSpecAttrs() {
207 assert(hasSavedAttrs);
209 if (savedAttrs.empty()) {
210 getMutableDeclSpec().getAttributes().set(0);
214 getMutableDeclSpec().getAttributes().set(savedAttrs[0]);
215 for (unsigned i = 0, e = savedAttrs.size() - 1; i != e; ++i)
216 savedAttrs[i]->setNext(savedAttrs[i+1]);
217 savedAttrs.back()->setNext(0);
221 /// Basically std::pair except that we really want to avoid an
222 /// implicit operator= for safety concerns. It's also a minor
223 /// link-time optimization for this to be a private type.
226 AttributeList &first;
228 /// The head of the list the attribute is currently in.
229 AttributeList *&second;
231 AttrAndList(AttributeList &attr, AttributeList *&head)
232 : first(attr), second(head) {}
237 template <> struct isPodLike<AttrAndList> {
238 static const bool value = true;
242 static void spliceAttrIntoList(AttributeList &attr, AttributeList *&head) {
247 static void spliceAttrOutOfList(AttributeList &attr, AttributeList *&head) {
249 head = attr.getNext();
253 AttributeList *cur = head;
255 assert(cur && cur->getNext() && "ran out of attrs?");
256 if (cur->getNext() == &attr) {
257 cur->setNext(attr.getNext());
260 cur = cur->getNext();
264 static void moveAttrFromListToList(AttributeList &attr,
265 AttributeList *&fromList,
266 AttributeList *&toList) {
267 spliceAttrOutOfList(attr, fromList);
268 spliceAttrIntoList(attr, toList);
271 static void processTypeAttrs(TypeProcessingState &state,
272 QualType &type, bool isDeclSpec,
273 AttributeList *attrs);
275 static bool handleFunctionTypeAttr(TypeProcessingState &state,
279 static bool handleObjCGCTypeAttr(TypeProcessingState &state,
280 AttributeList &attr, QualType &type);
282 static bool handleObjCOwnershipTypeAttr(TypeProcessingState &state,
283 AttributeList &attr, QualType &type);
285 static bool handleObjCPointerTypeAttr(TypeProcessingState &state,
286 AttributeList &attr, QualType &type) {
287 if (attr.getKind() == AttributeList::AT_objc_gc)
288 return handleObjCGCTypeAttr(state, attr, type);
289 assert(attr.getKind() == AttributeList::AT_objc_ownership);
290 return handleObjCOwnershipTypeAttr(state, attr, type);
293 /// Given that an objc_gc attribute was written somewhere on a
294 /// declaration *other* than on the declarator itself (for which, use
295 /// distributeObjCPointerTypeAttrFromDeclarator), and given that it
296 /// didn't apply in whatever position it was written in, try to move
297 /// it to a more appropriate position.
298 static void distributeObjCPointerTypeAttr(TypeProcessingState &state,
301 Declarator &declarator = state.getDeclarator();
302 for (unsigned i = state.getCurrentChunkIndex(); i != 0; --i) {
303 DeclaratorChunk &chunk = declarator.getTypeObject(i-1);
304 switch (chunk.Kind) {
305 case DeclaratorChunk::Pointer:
306 case DeclaratorChunk::BlockPointer:
307 moveAttrFromListToList(attr, state.getCurrentAttrListRef(),
308 chunk.getAttrListRef());
311 case DeclaratorChunk::Paren:
312 case DeclaratorChunk::Array:
315 // Don't walk through these.
316 case DeclaratorChunk::Reference:
317 case DeclaratorChunk::Function:
318 case DeclaratorChunk::MemberPointer:
324 diagnoseBadTypeAttribute(state.getSema(), attr, type);
327 /// Distribute an objc_gc type attribute that was written on the
330 distributeObjCPointerTypeAttrFromDeclarator(TypeProcessingState &state,
332 QualType &declSpecType) {
333 Declarator &declarator = state.getDeclarator();
335 // objc_gc goes on the innermost pointer to something that's not a
337 unsigned innermost = -1U;
338 bool considerDeclSpec = true;
339 for (unsigned i = 0, e = declarator.getNumTypeObjects(); i != e; ++i) {
340 DeclaratorChunk &chunk = declarator.getTypeObject(i);
341 switch (chunk.Kind) {
342 case DeclaratorChunk::Pointer:
343 case DeclaratorChunk::BlockPointer:
347 case DeclaratorChunk::Reference:
348 case DeclaratorChunk::MemberPointer:
349 case DeclaratorChunk::Paren:
350 case DeclaratorChunk::Array:
353 case DeclaratorChunk::Function:
354 considerDeclSpec = false;
360 // That might actually be the decl spec if we weren't blocked by
361 // anything in the declarator.
362 if (considerDeclSpec) {
363 if (handleObjCPointerTypeAttr(state, attr, declSpecType)) {
364 // Splice the attribute into the decl spec. Prevents the
365 // attribute from being applied multiple times and gives
366 // the source-location-filler something to work with.
367 state.saveDeclSpecAttrs();
368 moveAttrFromListToList(attr, declarator.getAttrListRef(),
369 declarator.getMutableDeclSpec().getAttributes().getListRef());
374 // Otherwise, if we found an appropriate chunk, splice the attribute
376 if (innermost != -1U) {
377 moveAttrFromListToList(attr, declarator.getAttrListRef(),
378 declarator.getTypeObject(innermost).getAttrListRef());
382 // Otherwise, diagnose when we're done building the type.
383 spliceAttrOutOfList(attr, declarator.getAttrListRef());
384 state.addIgnoredTypeAttr(attr);
387 /// A function type attribute was written somewhere in a declaration
388 /// *other* than on the declarator itself or in the decl spec. Given
389 /// that it didn't apply in whatever position it was written in, try
390 /// to move it to a more appropriate position.
391 static void distributeFunctionTypeAttr(TypeProcessingState &state,
394 Declarator &declarator = state.getDeclarator();
396 // Try to push the attribute from the return type of a function to
397 // the function itself.
398 for (unsigned i = state.getCurrentChunkIndex(); i != 0; --i) {
399 DeclaratorChunk &chunk = declarator.getTypeObject(i-1);
400 switch (chunk.Kind) {
401 case DeclaratorChunk::Function:
402 moveAttrFromListToList(attr, state.getCurrentAttrListRef(),
403 chunk.getAttrListRef());
406 case DeclaratorChunk::Paren:
407 case DeclaratorChunk::Pointer:
408 case DeclaratorChunk::BlockPointer:
409 case DeclaratorChunk::Array:
410 case DeclaratorChunk::Reference:
411 case DeclaratorChunk::MemberPointer:
416 diagnoseBadTypeAttribute(state.getSema(), attr, type);
419 /// Try to distribute a function type attribute to the innermost
420 /// function chunk or type. Returns true if the attribute was
421 /// distributed, false if no location was found.
423 distributeFunctionTypeAttrToInnermost(TypeProcessingState &state,
425 AttributeList *&attrList,
426 QualType &declSpecType) {
427 Declarator &declarator = state.getDeclarator();
429 // Put it on the innermost function chunk, if there is one.
430 for (unsigned i = 0, e = declarator.getNumTypeObjects(); i != e; ++i) {
431 DeclaratorChunk &chunk = declarator.getTypeObject(i);
432 if (chunk.Kind != DeclaratorChunk::Function) continue;
434 moveAttrFromListToList(attr, attrList, chunk.getAttrListRef());
438 if (handleFunctionTypeAttr(state, attr, declSpecType)) {
439 spliceAttrOutOfList(attr, attrList);
446 /// A function type attribute was written in the decl spec. Try to
447 /// apply it somewhere.
449 distributeFunctionTypeAttrFromDeclSpec(TypeProcessingState &state,
451 QualType &declSpecType) {
452 state.saveDeclSpecAttrs();
454 // Try to distribute to the innermost.
455 if (distributeFunctionTypeAttrToInnermost(state, attr,
456 state.getCurrentAttrListRef(),
460 // If that failed, diagnose the bad attribute when the declarator is
462 state.addIgnoredTypeAttr(attr);
465 /// A function type attribute was written on the declarator. Try to
466 /// apply it somewhere.
468 distributeFunctionTypeAttrFromDeclarator(TypeProcessingState &state,
470 QualType &declSpecType) {
471 Declarator &declarator = state.getDeclarator();
473 // Try to distribute to the innermost.
474 if (distributeFunctionTypeAttrToInnermost(state, attr,
475 declarator.getAttrListRef(),
479 // If that failed, diagnose the bad attribute when the declarator is
481 spliceAttrOutOfList(attr, declarator.getAttrListRef());
482 state.addIgnoredTypeAttr(attr);
485 /// \brief Given that there are attributes written on the declarator
486 /// itself, try to distribute any type attributes to the appropriate
487 /// declarator chunk.
489 /// These are attributes like the following:
492 /// but not necessarily this:
494 static void distributeTypeAttrsFromDeclarator(TypeProcessingState &state,
495 QualType &declSpecType) {
496 // Collect all the type attributes from the declarator itself.
497 assert(state.getDeclarator().getAttributes() && "declarator has no attrs!");
498 AttributeList *attr = state.getDeclarator().getAttributes();
501 next = attr->getNext();
503 switch (attr->getKind()) {
504 OBJC_POINTER_TYPE_ATTRS_CASELIST:
505 distributeObjCPointerTypeAttrFromDeclarator(state, *attr, declSpecType);
508 case AttributeList::AT_ns_returns_retained:
509 if (!state.getSema().getLangOpts().ObjCAutoRefCount)
513 FUNCTION_TYPE_ATTRS_CASELIST:
514 distributeFunctionTypeAttrFromDeclarator(state, *attr, declSpecType);
520 } while ((attr = next));
523 /// Add a synthetic '()' to a block-literal declarator if it is
524 /// required, given the return type.
525 static void maybeSynthesizeBlockSignature(TypeProcessingState &state,
526 QualType declSpecType) {
527 Declarator &declarator = state.getDeclarator();
529 // First, check whether the declarator would produce a function,
530 // i.e. whether the innermost semantic chunk is a function.
531 if (declarator.isFunctionDeclarator()) {
532 // If so, make that declarator a prototyped declarator.
533 declarator.getFunctionTypeInfo().hasPrototype = true;
537 // If there are any type objects, the type as written won't name a
538 // function, regardless of the decl spec type. This is because a
539 // block signature declarator is always an abstract-declarator, and
540 // abstract-declarators can't just be parentheses chunks. Therefore
541 // we need to build a function chunk unless there are no type
542 // objects and the decl spec type is a function.
543 if (!declarator.getNumTypeObjects() && declSpecType->isFunctionType())
546 // Note that there *are* cases with invalid declarators where
547 // declarators consist solely of parentheses. In general, these
548 // occur only in failed efforts to make function declarators, so
549 // faking up the function chunk is still the right thing to do.
551 // Otherwise, we need to fake up a function declarator.
552 SourceLocation loc = declarator.getLocStart();
554 // ...and *prepend* it to the declarator.
555 declarator.AddInnermostTypeInfo(DeclaratorChunk::getFunction(
557 /*variadic*/ false, SourceLocation(),
560 /*ref-qualifier*/true, SourceLocation(),
561 /*const qualifier*/SourceLocation(),
562 /*volatile qualifier*/SourceLocation(),
563 /*mutable qualifier*/SourceLocation(),
564 /*EH*/ EST_None, SourceLocation(), 0, 0, 0, 0,
568 // For consistency, make sure the state still has us as processing
570 assert(state.getCurrentChunkIndex() == declarator.getNumTypeObjects() - 1);
571 state.setCurrentChunkIndex(declarator.getNumTypeObjects());
574 /// \brief Convert the specified declspec to the appropriate type
576 /// \param D the declarator containing the declaration specifier.
577 /// \returns The type described by the declaration specifiers. This function
578 /// never returns null.
579 static QualType ConvertDeclSpecToType(TypeProcessingState &state) {
580 // FIXME: Should move the logic from DeclSpec::Finish to here for validity
583 Sema &S = state.getSema();
584 Declarator &declarator = state.getDeclarator();
585 const DeclSpec &DS = declarator.getDeclSpec();
586 SourceLocation DeclLoc = declarator.getIdentifierLoc();
587 if (DeclLoc.isInvalid())
588 DeclLoc = DS.getLocStart();
590 ASTContext &Context = S.Context;
593 switch (DS.getTypeSpecType()) {
594 case DeclSpec::TST_void:
595 Result = Context.VoidTy;
597 case DeclSpec::TST_char:
598 if (DS.getTypeSpecSign() == DeclSpec::TSS_unspecified)
599 Result = Context.CharTy;
600 else if (DS.getTypeSpecSign() == DeclSpec::TSS_signed)
601 Result = Context.SignedCharTy;
603 assert(DS.getTypeSpecSign() == DeclSpec::TSS_unsigned &&
604 "Unknown TSS value");
605 Result = Context.UnsignedCharTy;
608 case DeclSpec::TST_wchar:
609 if (DS.getTypeSpecSign() == DeclSpec::TSS_unspecified)
610 Result = Context.WCharTy;
611 else if (DS.getTypeSpecSign() == DeclSpec::TSS_signed) {
612 S.Diag(DS.getTypeSpecSignLoc(), diag::ext_invalid_sign_spec)
613 << DS.getSpecifierName(DS.getTypeSpecType());
614 Result = Context.getSignedWCharType();
616 assert(DS.getTypeSpecSign() == DeclSpec::TSS_unsigned &&
617 "Unknown TSS value");
618 S.Diag(DS.getTypeSpecSignLoc(), diag::ext_invalid_sign_spec)
619 << DS.getSpecifierName(DS.getTypeSpecType());
620 Result = Context.getUnsignedWCharType();
623 case DeclSpec::TST_char16:
624 assert(DS.getTypeSpecSign() == DeclSpec::TSS_unspecified &&
625 "Unknown TSS value");
626 Result = Context.Char16Ty;
628 case DeclSpec::TST_char32:
629 assert(DS.getTypeSpecSign() == DeclSpec::TSS_unspecified &&
630 "Unknown TSS value");
631 Result = Context.Char32Ty;
633 case DeclSpec::TST_unspecified:
634 // "<proto1,proto2>" is an objc qualified ID with a missing id.
635 if (DeclSpec::ProtocolQualifierListTy PQ = DS.getProtocolQualifiers()) {
636 Result = Context.getObjCObjectType(Context.ObjCBuiltinIdTy,
637 (ObjCProtocolDecl**)PQ,
638 DS.getNumProtocolQualifiers());
639 Result = Context.getObjCObjectPointerType(Result);
643 // If this is a missing declspec in a block literal return context, then it
644 // is inferred from the return statements inside the block.
645 // The declspec is always missing in a lambda expr context; it is either
646 // specified with a trailing return type or inferred.
647 if (declarator.getContext() == Declarator::LambdaExprContext ||
648 isOmittedBlockReturnType(declarator)) {
649 Result = Context.DependentTy;
653 // Unspecified typespec defaults to int in C90. However, the C90 grammar
654 // [C90 6.5] only allows a decl-spec if there was *some* type-specifier,
655 // type-qualifier, or storage-class-specifier. If not, emit an extwarn.
656 // Note that the one exception to this is function definitions, which are
657 // allowed to be completely missing a declspec. This is handled in the
658 // parser already though by it pretending to have seen an 'int' in this
660 if (S.getLangOpts().ImplicitInt) {
661 // In C89 mode, we only warn if there is a completely missing declspec
662 // when one is not allowed.
664 S.Diag(DeclLoc, diag::ext_missing_declspec)
665 << DS.getSourceRange()
666 << FixItHint::CreateInsertion(DS.getLocStart(), "int");
668 } else if (!DS.hasTypeSpecifier()) {
669 // C99 and C++ require a type specifier. For example, C99 6.7.2p2 says:
670 // "At least one type specifier shall be given in the declaration
671 // specifiers in each declaration, and in the specifier-qualifier list in
672 // each struct declaration and type name."
673 // FIXME: Does Microsoft really have the implicit int extension in C++?
674 if (S.getLangOpts().CPlusPlus &&
675 !S.getLangOpts().MicrosoftExt) {
676 S.Diag(DeclLoc, diag::err_missing_type_specifier)
677 << DS.getSourceRange();
679 // When this occurs in C++ code, often something is very broken with the
680 // value being declared, poison it as invalid so we don't get chains of
682 declarator.setInvalidType(true);
684 S.Diag(DeclLoc, diag::ext_missing_type_specifier)
685 << DS.getSourceRange();
690 case DeclSpec::TST_int: {
691 if (DS.getTypeSpecSign() != DeclSpec::TSS_unsigned) {
692 switch (DS.getTypeSpecWidth()) {
693 case DeclSpec::TSW_unspecified: Result = Context.IntTy; break;
694 case DeclSpec::TSW_short: Result = Context.ShortTy; break;
695 case DeclSpec::TSW_long: Result = Context.LongTy; break;
696 case DeclSpec::TSW_longlong:
697 Result = Context.LongLongTy;
699 // long long is a C99 feature.
700 if (!S.getLangOpts().C99)
701 S.Diag(DS.getTypeSpecWidthLoc(),
702 S.getLangOpts().CPlusPlus0x ?
703 diag::warn_cxx98_compat_longlong : diag::ext_longlong);
707 switch (DS.getTypeSpecWidth()) {
708 case DeclSpec::TSW_unspecified: Result = Context.UnsignedIntTy; break;
709 case DeclSpec::TSW_short: Result = Context.UnsignedShortTy; break;
710 case DeclSpec::TSW_long: Result = Context.UnsignedLongTy; break;
711 case DeclSpec::TSW_longlong:
712 Result = Context.UnsignedLongLongTy;
714 // long long is a C99 feature.
715 if (!S.getLangOpts().C99)
716 S.Diag(DS.getTypeSpecWidthLoc(),
717 S.getLangOpts().CPlusPlus0x ?
718 diag::warn_cxx98_compat_longlong : diag::ext_longlong);
724 case DeclSpec::TST_int128:
725 if (DS.getTypeSpecSign() == DeclSpec::TSS_unsigned)
726 Result = Context.UnsignedInt128Ty;
728 Result = Context.Int128Ty;
730 case DeclSpec::TST_half: Result = Context.HalfTy; break;
731 case DeclSpec::TST_float: Result = Context.FloatTy; break;
732 case DeclSpec::TST_double:
733 if (DS.getTypeSpecWidth() == DeclSpec::TSW_long)
734 Result = Context.LongDoubleTy;
736 Result = Context.DoubleTy;
738 if (S.getLangOpts().OpenCL && !S.getOpenCLOptions().cl_khr_fp64) {
739 S.Diag(DS.getTypeSpecTypeLoc(), diag::err_double_requires_fp64);
740 declarator.setInvalidType(true);
743 case DeclSpec::TST_bool: Result = Context.BoolTy; break; // _Bool or bool
744 case DeclSpec::TST_decimal32: // _Decimal32
745 case DeclSpec::TST_decimal64: // _Decimal64
746 case DeclSpec::TST_decimal128: // _Decimal128
747 S.Diag(DS.getTypeSpecTypeLoc(), diag::err_decimal_unsupported);
748 Result = Context.IntTy;
749 declarator.setInvalidType(true);
751 case DeclSpec::TST_class:
752 case DeclSpec::TST_enum:
753 case DeclSpec::TST_union:
754 case DeclSpec::TST_struct: {
755 TypeDecl *D = dyn_cast_or_null<TypeDecl>(DS.getRepAsDecl());
757 // This can happen in C++ with ambiguous lookups.
758 Result = Context.IntTy;
759 declarator.setInvalidType(true);
763 // If the type is deprecated or unavailable, diagnose it.
764 S.DiagnoseUseOfDecl(D, DS.getTypeSpecTypeNameLoc());
766 assert(DS.getTypeSpecWidth() == 0 && DS.getTypeSpecComplex() == 0 &&
767 DS.getTypeSpecSign() == 0 && "No qualifiers on tag names!");
769 // TypeQuals handled by caller.
770 Result = Context.getTypeDeclType(D);
772 // In both C and C++, make an ElaboratedType.
773 ElaboratedTypeKeyword Keyword
774 = ElaboratedType::getKeywordForTypeSpec(DS.getTypeSpecType());
775 Result = S.getElaboratedType(Keyword, DS.getTypeSpecScope(), Result);
778 case DeclSpec::TST_typename: {
779 assert(DS.getTypeSpecWidth() == 0 && DS.getTypeSpecComplex() == 0 &&
780 DS.getTypeSpecSign() == 0 &&
781 "Can't handle qualifiers on typedef names yet!");
782 Result = S.GetTypeFromParser(DS.getRepAsType());
784 declarator.setInvalidType(true);
785 else if (DeclSpec::ProtocolQualifierListTy PQ
786 = DS.getProtocolQualifiers()) {
787 if (const ObjCObjectType *ObjT = Result->getAs<ObjCObjectType>()) {
788 // Silently drop any existing protocol qualifiers.
789 // TODO: determine whether that's the right thing to do.
790 if (ObjT->getNumProtocols())
791 Result = ObjT->getBaseType();
793 if (DS.getNumProtocolQualifiers())
794 Result = Context.getObjCObjectType(Result,
795 (ObjCProtocolDecl**) PQ,
796 DS.getNumProtocolQualifiers());
797 } else if (Result->isObjCIdType()) {
799 Result = Context.getObjCObjectType(Context.ObjCBuiltinIdTy,
800 (ObjCProtocolDecl**) PQ,
801 DS.getNumProtocolQualifiers());
802 Result = Context.getObjCObjectPointerType(Result);
803 } else if (Result->isObjCClassType()) {
804 // Class<protocol-list>
805 Result = Context.getObjCObjectType(Context.ObjCBuiltinClassTy,
806 (ObjCProtocolDecl**) PQ,
807 DS.getNumProtocolQualifiers());
808 Result = Context.getObjCObjectPointerType(Result);
810 S.Diag(DeclLoc, diag::err_invalid_protocol_qualifiers)
811 << DS.getSourceRange();
812 declarator.setInvalidType(true);
816 // TypeQuals handled by caller.
819 case DeclSpec::TST_typeofType:
820 // FIXME: Preserve type source info.
821 Result = S.GetTypeFromParser(DS.getRepAsType());
822 assert(!Result.isNull() && "Didn't get a type for typeof?");
823 if (!Result->isDependentType())
824 if (const TagType *TT = Result->getAs<TagType>())
825 S.DiagnoseUseOfDecl(TT->getDecl(), DS.getTypeSpecTypeLoc());
826 // TypeQuals handled by caller.
827 Result = Context.getTypeOfType(Result);
829 case DeclSpec::TST_typeofExpr: {
830 Expr *E = DS.getRepAsExpr();
831 assert(E && "Didn't get an expression for typeof?");
832 // TypeQuals handled by caller.
833 Result = S.BuildTypeofExprType(E, DS.getTypeSpecTypeLoc());
834 if (Result.isNull()) {
835 Result = Context.IntTy;
836 declarator.setInvalidType(true);
840 case DeclSpec::TST_decltype: {
841 Expr *E = DS.getRepAsExpr();
842 assert(E && "Didn't get an expression for decltype?");
843 // TypeQuals handled by caller.
844 Result = S.BuildDecltypeType(E, DS.getTypeSpecTypeLoc());
845 if (Result.isNull()) {
846 Result = Context.IntTy;
847 declarator.setInvalidType(true);
851 case DeclSpec::TST_underlyingType:
852 Result = S.GetTypeFromParser(DS.getRepAsType());
853 assert(!Result.isNull() && "Didn't get a type for __underlying_type?");
854 Result = S.BuildUnaryTransformType(Result,
855 UnaryTransformType::EnumUnderlyingType,
856 DS.getTypeSpecTypeLoc());
857 if (Result.isNull()) {
858 Result = Context.IntTy;
859 declarator.setInvalidType(true);
863 case DeclSpec::TST_auto: {
864 // TypeQuals handled by caller.
865 Result = Context.getAutoType(QualType());
869 case DeclSpec::TST_unknown_anytype:
870 Result = Context.UnknownAnyTy;
873 case DeclSpec::TST_atomic:
874 Result = S.GetTypeFromParser(DS.getRepAsType());
875 assert(!Result.isNull() && "Didn't get a type for _Atomic?");
876 Result = S.BuildAtomicType(Result, DS.getTypeSpecTypeLoc());
877 if (Result.isNull()) {
878 Result = Context.IntTy;
879 declarator.setInvalidType(true);
883 case DeclSpec::TST_error:
884 Result = Context.IntTy;
885 declarator.setInvalidType(true);
889 // Handle complex types.
890 if (DS.getTypeSpecComplex() == DeclSpec::TSC_complex) {
891 if (S.getLangOpts().Freestanding)
892 S.Diag(DS.getTypeSpecComplexLoc(), diag::ext_freestanding_complex);
893 Result = Context.getComplexType(Result);
894 } else if (DS.isTypeAltiVecVector()) {
895 unsigned typeSize = static_cast<unsigned>(Context.getTypeSize(Result));
896 assert(typeSize > 0 && "type size for vector must be greater than 0 bits");
897 VectorType::VectorKind VecKind = VectorType::AltiVecVector;
898 if (DS.isTypeAltiVecPixel())
899 VecKind = VectorType::AltiVecPixel;
900 else if (DS.isTypeAltiVecBool())
901 VecKind = VectorType::AltiVecBool;
902 Result = Context.getVectorType(Result, 128/typeSize, VecKind);
906 if (DS.getTypeSpecComplex() == DeclSpec::TSC_imaginary)
907 S.Diag(DS.getTypeSpecComplexLoc(), diag::err_imaginary_not_supported);
909 // Before we process any type attributes, synthesize a block literal
910 // function declarator if necessary.
911 if (declarator.getContext() == Declarator::BlockLiteralContext)
912 maybeSynthesizeBlockSignature(state, Result);
914 // Apply any type attributes from the decl spec. This may cause the
915 // list of type attributes to be temporarily saved while the type
916 // attributes are pushed around.
917 if (AttributeList *attrs = DS.getAttributes().getList())
918 processTypeAttrs(state, Result, true, attrs);
920 // Apply const/volatile/restrict qualifiers to T.
921 if (unsigned TypeQuals = DS.getTypeQualifiers()) {
923 // Enforce C99 6.7.3p2: "Types other than pointer types derived from object
924 // or incomplete types shall not be restrict-qualified." C++ also allows
925 // restrict-qualified references.
926 if (TypeQuals & DeclSpec::TQ_restrict) {
927 if (Result->isAnyPointerType() || Result->isReferenceType()) {
929 if (Result->isObjCObjectPointerType())
932 EltTy = Result->isPointerType() ?
933 Result->getAs<PointerType>()->getPointeeType() :
934 Result->getAs<ReferenceType>()->getPointeeType();
936 // If we have a pointer or reference, the pointee must have an object
938 if (!EltTy->isIncompleteOrObjectType()) {
939 S.Diag(DS.getRestrictSpecLoc(),
940 diag::err_typecheck_invalid_restrict_invalid_pointee)
941 << EltTy << DS.getSourceRange();
942 TypeQuals &= ~DeclSpec::TQ_restrict; // Remove the restrict qualifier.
945 S.Diag(DS.getRestrictSpecLoc(),
946 diag::err_typecheck_invalid_restrict_not_pointer)
947 << Result << DS.getSourceRange();
948 TypeQuals &= ~DeclSpec::TQ_restrict; // Remove the restrict qualifier.
952 // Warn about CV qualifiers on functions: C99 6.7.3p8: "If the specification
953 // of a function type includes any type qualifiers, the behavior is
955 if (Result->isFunctionType() && TypeQuals) {
956 // Get some location to point at, either the C or V location.
958 if (TypeQuals & DeclSpec::TQ_const)
959 Loc = DS.getConstSpecLoc();
960 else if (TypeQuals & DeclSpec::TQ_volatile)
961 Loc = DS.getVolatileSpecLoc();
963 assert((TypeQuals & DeclSpec::TQ_restrict) &&
964 "Has CVR quals but not C, V, or R?");
965 Loc = DS.getRestrictSpecLoc();
967 S.Diag(Loc, diag::warn_typecheck_function_qualifiers)
968 << Result << DS.getSourceRange();
972 // Cv-qualified references are ill-formed except when the
973 // cv-qualifiers are introduced through the use of a typedef
974 // (7.1.3) or of a template type argument (14.3), in which
975 // case the cv-qualifiers are ignored.
976 // FIXME: Shouldn't we be checking SCS_typedef here?
977 if (DS.getTypeSpecType() == DeclSpec::TST_typename &&
978 TypeQuals && Result->isReferenceType()) {
979 TypeQuals &= ~DeclSpec::TQ_const;
980 TypeQuals &= ~DeclSpec::TQ_volatile;
983 // C90 6.5.3 constraints: "The same type qualifier shall not appear more
984 // than once in the same specifier-list or qualifier-list, either directly
985 // or via one or more typedefs."
986 if (!S.getLangOpts().C99 && !S.getLangOpts().CPlusPlus
987 && TypeQuals & Result.getCVRQualifiers()) {
988 if (TypeQuals & DeclSpec::TQ_const && Result.isConstQualified()) {
989 S.Diag(DS.getConstSpecLoc(), diag::ext_duplicate_declspec)
993 if (TypeQuals & DeclSpec::TQ_volatile && Result.isVolatileQualified()) {
994 S.Diag(DS.getVolatileSpecLoc(), diag::ext_duplicate_declspec)
998 // C90 doesn't have restrict, so it doesn't force us to produce a warning
1002 Qualifiers Quals = Qualifiers::fromCVRMask(TypeQuals);
1003 Result = Context.getQualifiedType(Result, Quals);
1009 static std::string getPrintableNameForEntity(DeclarationName Entity) {
1011 return Entity.getAsString();
1016 QualType Sema::BuildQualifiedType(QualType T, SourceLocation Loc,
1018 // Enforce C99 6.7.3p2: "Types other than pointer types derived from
1019 // object or incomplete types shall not be restrict-qualified."
1020 if (Qs.hasRestrict()) {
1021 unsigned DiagID = 0;
1024 const Type *Ty = T->getCanonicalTypeInternal().getTypePtr();
1025 if (const ReferenceType *RTy = dyn_cast<ReferenceType>(Ty)) {
1026 if (!RTy->getPointeeType()->isIncompleteOrObjectType()) {
1027 DiagID = diag::err_typecheck_invalid_restrict_invalid_pointee;
1028 ProblemTy = T->getAs<ReferenceType>()->getPointeeType();
1030 } else if (const PointerType *PTy = dyn_cast<PointerType>(Ty)) {
1031 if (!PTy->getPointeeType()->isIncompleteOrObjectType()) {
1032 DiagID = diag::err_typecheck_invalid_restrict_invalid_pointee;
1033 ProblemTy = T->getAs<PointerType>()->getPointeeType();
1035 } else if (const MemberPointerType *PTy = dyn_cast<MemberPointerType>(Ty)) {
1036 if (!PTy->getPointeeType()->isIncompleteOrObjectType()) {
1037 DiagID = diag::err_typecheck_invalid_restrict_invalid_pointee;
1038 ProblemTy = T->getAs<PointerType>()->getPointeeType();
1040 } else if (!Ty->isDependentType()) {
1041 // FIXME: this deserves a proper diagnostic
1042 DiagID = diag::err_typecheck_invalid_restrict_invalid_pointee;
1047 Diag(Loc, DiagID) << ProblemTy;
1048 Qs.removeRestrict();
1052 return Context.getQualifiedType(T, Qs);
1055 /// \brief Build a paren type including \p T.
1056 QualType Sema::BuildParenType(QualType T) {
1057 return Context.getParenType(T);
1060 /// Given that we're building a pointer or reference to the given
1061 static QualType inferARCLifetimeForPointee(Sema &S, QualType type,
1064 // Bail out if retention is unrequired or already specified.
1065 if (!type->isObjCLifetimeType() ||
1066 type.getObjCLifetime() != Qualifiers::OCL_None)
1069 Qualifiers::ObjCLifetime implicitLifetime = Qualifiers::OCL_None;
1071 // If the object type is const-qualified, we can safely use
1072 // __unsafe_unretained. This is safe (because there are no read
1073 // barriers), and it'll be safe to coerce anything but __weak* to
1074 // the resulting type.
1075 if (type.isConstQualified()) {
1076 implicitLifetime = Qualifiers::OCL_ExplicitNone;
1078 // Otherwise, check whether the static type does not require
1079 // retaining. This currently only triggers for Class (possibly
1080 // protocol-qualifed, and arrays thereof).
1081 } else if (type->isObjCARCImplicitlyUnretainedType()) {
1082 implicitLifetime = Qualifiers::OCL_ExplicitNone;
1084 // If we are in an unevaluated context, like sizeof, skip adding a
1086 } else if (S.ExprEvalContexts.back().Context == Sema::Unevaluated) {
1089 // If that failed, give an error and recover using __strong. __strong
1090 // is the option most likely to prevent spurious second-order diagnostics,
1091 // like when binding a reference to a field.
1093 // These types can show up in private ivars in system headers, so
1094 // we need this to not be an error in those cases. Instead we
1096 if (S.DelayedDiagnostics.shouldDelayDiagnostics()) {
1097 S.DelayedDiagnostics.add(
1098 sema::DelayedDiagnostic::makeForbiddenType(loc,
1099 diag::err_arc_indirect_no_ownership, type, isReference));
1101 S.Diag(loc, diag::err_arc_indirect_no_ownership) << type << isReference;
1103 implicitLifetime = Qualifiers::OCL_Strong;
1105 assert(implicitLifetime && "didn't infer any lifetime!");
1108 qs.addObjCLifetime(implicitLifetime);
1109 return S.Context.getQualifiedType(type, qs);
1112 /// \brief Build a pointer type.
1114 /// \param T The type to which we'll be building a pointer.
1116 /// \param Loc The location of the entity whose type involves this
1117 /// pointer type or, if there is no such entity, the location of the
1118 /// type that will have pointer type.
1120 /// \param Entity The name of the entity that involves the pointer
1123 /// \returns A suitable pointer type, if there are no
1124 /// errors. Otherwise, returns a NULL type.
1125 QualType Sema::BuildPointerType(QualType T,
1126 SourceLocation Loc, DeclarationName Entity) {
1127 if (T->isReferenceType()) {
1128 // C++ 8.3.2p4: There shall be no ... pointers to references ...
1129 Diag(Loc, diag::err_illegal_decl_pointer_to_reference)
1130 << getPrintableNameForEntity(Entity) << T;
1134 assert(!T->isObjCObjectType() && "Should build ObjCObjectPointerType");
1136 // In ARC, it is forbidden to build pointers to unqualified pointers.
1137 if (getLangOpts().ObjCAutoRefCount)
1138 T = inferARCLifetimeForPointee(*this, T, Loc, /*reference*/ false);
1140 // Build the pointer type.
1141 return Context.getPointerType(T);
1144 /// \brief Build a reference type.
1146 /// \param T The type to which we'll be building a reference.
1148 /// \param Loc The location of the entity whose type involves this
1149 /// reference type or, if there is no such entity, the location of the
1150 /// type that will have reference type.
1152 /// \param Entity The name of the entity that involves the reference
1155 /// \returns A suitable reference type, if there are no
1156 /// errors. Otherwise, returns a NULL type.
1157 QualType Sema::BuildReferenceType(QualType T, bool SpelledAsLValue,
1159 DeclarationName Entity) {
1160 assert(Context.getCanonicalType(T) != Context.OverloadTy &&
1161 "Unresolved overloaded function type");
1163 // C++0x [dcl.ref]p6:
1164 // If a typedef (7.1.3), a type template-parameter (14.3.1), or a
1165 // decltype-specifier (7.1.6.2) denotes a type TR that is a reference to a
1166 // type T, an attempt to create the type "lvalue reference to cv TR" creates
1167 // the type "lvalue reference to T", while an attempt to create the type
1168 // "rvalue reference to cv TR" creates the type TR.
1169 bool LValueRef = SpelledAsLValue || T->getAs<LValueReferenceType>();
1171 // C++ [dcl.ref]p4: There shall be no references to references.
1173 // According to C++ DR 106, references to references are only
1174 // diagnosed when they are written directly (e.g., "int & &"),
1175 // but not when they happen via a typedef:
1177 // typedef int& intref;
1178 // typedef intref& intref2;
1180 // Parser::ParseDeclaratorInternal diagnoses the case where
1181 // references are written directly; here, we handle the
1182 // collapsing of references-to-references as described in C++0x.
1183 // DR 106 and 540 introduce reference-collapsing into C++98/03.
1186 // A declarator that specifies the type "reference to cv void"
1188 if (T->isVoidType()) {
1189 Diag(Loc, diag::err_reference_to_void);
1193 // In ARC, it is forbidden to build references to unqualified pointers.
1194 if (getLangOpts().ObjCAutoRefCount)
1195 T = inferARCLifetimeForPointee(*this, T, Loc, /*reference*/ true);
1197 // Handle restrict on references.
1199 return Context.getLValueReferenceType(T, SpelledAsLValue);
1200 return Context.getRValueReferenceType(T);
1203 /// Check whether the specified array size makes the array type a VLA. If so,
1204 /// return true, if not, return the size of the array in SizeVal.
1205 static bool isArraySizeVLA(Sema &S, Expr *ArraySize, llvm::APSInt &SizeVal) {
1206 // If the size is an ICE, it certainly isn't a VLA. If we're in a GNU mode
1207 // (like gnu99, but not c99) accept any evaluatable value as an extension.
1208 return S.VerifyIntegerConstantExpression(
1209 ArraySize, &SizeVal, S.PDiag(), S.LangOpts.GNUMode,
1210 S.PDiag(diag::ext_vla_folded_to_constant)).isInvalid();
1214 /// \brief Build an array type.
1216 /// \param T The type of each element in the array.
1218 /// \param ASM C99 array size modifier (e.g., '*', 'static').
1220 /// \param ArraySize Expression describing the size of the array.
1222 /// \param Loc The location of the entity whose type involves this
1223 /// array type or, if there is no such entity, the location of the
1224 /// type that will have array type.
1226 /// \param Entity The name of the entity that involves the array
1229 /// \returns A suitable array type, if there are no errors. Otherwise,
1230 /// returns a NULL type.
1231 QualType Sema::BuildArrayType(QualType T, ArrayType::ArraySizeModifier ASM,
1232 Expr *ArraySize, unsigned Quals,
1233 SourceRange Brackets, DeclarationName Entity) {
1235 SourceLocation Loc = Brackets.getBegin();
1236 if (getLangOpts().CPlusPlus) {
1237 // C++ [dcl.array]p1:
1238 // T is called the array element type; this type shall not be a reference
1239 // type, the (possibly cv-qualified) type void, a function type or an
1240 // abstract class type.
1242 // Note: function types are handled in the common path with C.
1243 if (T->isReferenceType()) {
1244 Diag(Loc, diag::err_illegal_decl_array_of_references)
1245 << getPrintableNameForEntity(Entity) << T;
1249 if (T->isVoidType()) {
1250 Diag(Loc, diag::err_illegal_decl_array_incomplete_type) << T;
1254 if (RequireNonAbstractType(Brackets.getBegin(), T,
1255 diag::err_array_of_abstract_type))
1259 // C99 6.7.5.2p1: If the element type is an incomplete or function type,
1260 // reject it (e.g. void ary[7], struct foo ary[7], void ary[7]())
1261 if (RequireCompleteType(Loc, T,
1262 diag::err_illegal_decl_array_incomplete_type))
1266 if (T->isFunctionType()) {
1267 Diag(Loc, diag::err_illegal_decl_array_of_functions)
1268 << getPrintableNameForEntity(Entity) << T;
1272 if (T->getContainedAutoType()) {
1273 Diag(Loc, diag::err_illegal_decl_array_of_auto)
1274 << getPrintableNameForEntity(Entity) << T;
1278 if (const RecordType *EltTy = T->getAs<RecordType>()) {
1279 // If the element type is a struct or union that contains a variadic
1280 // array, accept it as a GNU extension: C99 6.7.2.1p2.
1281 if (EltTy->getDecl()->hasFlexibleArrayMember())
1282 Diag(Loc, diag::ext_flexible_array_in_array) << T;
1283 } else if (T->isObjCObjectType()) {
1284 Diag(Loc, diag::err_objc_array_of_interfaces) << T;
1288 // Do placeholder conversions on the array size expression.
1289 if (ArraySize && ArraySize->hasPlaceholderType()) {
1290 ExprResult Result = CheckPlaceholderExpr(ArraySize);
1291 if (Result.isInvalid()) return QualType();
1292 ArraySize = Result.take();
1295 // Do lvalue-to-rvalue conversions on the array size expression.
1296 if (ArraySize && !ArraySize->isRValue()) {
1297 ExprResult Result = DefaultLvalueConversion(ArraySize);
1298 if (Result.isInvalid())
1301 ArraySize = Result.take();
1304 // C99 6.7.5.2p1: The size expression shall have integer type.
1305 // C++11 allows contextual conversions to such types.
1306 if (!getLangOpts().CPlusPlus0x &&
1307 ArraySize && !ArraySize->isTypeDependent() &&
1308 !ArraySize->getType()->isIntegralOrUnscopedEnumerationType()) {
1309 Diag(ArraySize->getLocStart(), diag::err_array_size_non_int)
1310 << ArraySize->getType() << ArraySize->getSourceRange();
1314 llvm::APSInt ConstVal(Context.getTypeSize(Context.getSizeType()));
1316 if (ASM == ArrayType::Star)
1317 T = Context.getVariableArrayType(T, 0, ASM, Quals, Brackets);
1319 T = Context.getIncompleteArrayType(T, ASM, Quals);
1320 } else if (ArraySize->isTypeDependent() || ArraySize->isValueDependent()) {
1321 T = Context.getDependentSizedArrayType(T, ArraySize, ASM, Quals, Brackets);
1322 } else if ((!T->isDependentType() && !T->isIncompleteType() &&
1323 !T->isConstantSizeType()) ||
1324 isArraySizeVLA(*this, ArraySize, ConstVal)) {
1325 // Even in C++11, don't allow contextual conversions in the array bound
1327 if (getLangOpts().CPlusPlus0x &&
1328 !ArraySize->getType()->isIntegralOrUnscopedEnumerationType()) {
1329 Diag(ArraySize->getLocStart(), diag::err_array_size_non_int)
1330 << ArraySize->getType() << ArraySize->getSourceRange();
1334 // C99: an array with an element type that has a non-constant-size is a VLA.
1335 // C99: an array with a non-ICE size is a VLA. We accept any expression
1336 // that we can fold to a non-zero positive value as an extension.
1337 T = Context.getVariableArrayType(T, ArraySize, ASM, Quals, Brackets);
1339 // C99 6.7.5.2p1: If the expression is a constant expression, it shall
1340 // have a value greater than zero.
1341 if (ConstVal.isSigned() && ConstVal.isNegative()) {
1343 Diag(ArraySize->getLocStart(), diag::err_decl_negative_array_size)
1344 << getPrintableNameForEntity(Entity) << ArraySize->getSourceRange();
1346 Diag(ArraySize->getLocStart(), diag::err_typecheck_negative_array_size)
1347 << ArraySize->getSourceRange();
1350 if (ConstVal == 0) {
1351 // GCC accepts zero sized static arrays. We allow them when
1352 // we're not in a SFINAE context.
1353 Diag(ArraySize->getLocStart(),
1354 isSFINAEContext()? diag::err_typecheck_zero_array_size
1355 : diag::ext_typecheck_zero_array_size)
1356 << ArraySize->getSourceRange();
1358 if (ASM == ArrayType::Static) {
1359 Diag(ArraySize->getLocStart(),
1360 diag::warn_typecheck_zero_static_array_size)
1361 << ArraySize->getSourceRange();
1362 ASM = ArrayType::Normal;
1364 } else if (!T->isDependentType() && !T->isVariablyModifiedType() &&
1365 !T->isIncompleteType()) {
1366 // Is the array too large?
1367 unsigned ActiveSizeBits
1368 = ConstantArrayType::getNumAddressingBits(Context, T, ConstVal);
1369 if (ActiveSizeBits > ConstantArrayType::getMaxSizeBits(Context))
1370 Diag(ArraySize->getLocStart(), diag::err_array_too_large)
1371 << ConstVal.toString(10)
1372 << ArraySize->getSourceRange();
1375 T = Context.getConstantArrayType(T, ConstVal, ASM, Quals);
1377 // If this is not C99, extwarn about VLA's and C99 array size modifiers.
1378 if (!getLangOpts().C99) {
1379 if (T->isVariableArrayType()) {
1380 // Prohibit the use of non-POD types in VLAs.
1381 QualType BaseT = Context.getBaseElementType(T);
1382 if (!T->isDependentType() &&
1383 !BaseT.isPODType(Context) &&
1384 !BaseT->isObjCLifetimeType()) {
1385 Diag(Loc, diag::err_vla_non_pod)
1389 // Prohibit the use of VLAs during template argument deduction.
1390 else if (isSFINAEContext()) {
1391 Diag(Loc, diag::err_vla_in_sfinae);
1394 // Just extwarn about VLAs.
1396 Diag(Loc, diag::ext_vla);
1397 } else if (ASM != ArrayType::Normal || Quals != 0)
1399 getLangOpts().CPlusPlus? diag::err_c99_array_usage_cxx
1400 : diag::ext_c99_array_usage) << ASM;
1406 /// \brief Build an ext-vector type.
1408 /// Run the required checks for the extended vector type.
1409 QualType Sema::BuildExtVectorType(QualType T, Expr *ArraySize,
1410 SourceLocation AttrLoc) {
1411 // unlike gcc's vector_size attribute, we do not allow vectors to be defined
1412 // in conjunction with complex types (pointers, arrays, functions, etc.).
1413 if (!T->isDependentType() &&
1414 !T->isIntegerType() && !T->isRealFloatingType()) {
1415 Diag(AttrLoc, diag::err_attribute_invalid_vector_type) << T;
1419 if (!ArraySize->isTypeDependent() && !ArraySize->isValueDependent()) {
1420 llvm::APSInt vecSize(32);
1421 if (!ArraySize->isIntegerConstantExpr(vecSize, Context)) {
1422 Diag(AttrLoc, diag::err_attribute_argument_not_int)
1423 << "ext_vector_type" << ArraySize->getSourceRange();
1427 // unlike gcc's vector_size attribute, the size is specified as the
1428 // number of elements, not the number of bytes.
1429 unsigned vectorSize = static_cast<unsigned>(vecSize.getZExtValue());
1431 if (vectorSize == 0) {
1432 Diag(AttrLoc, diag::err_attribute_zero_size)
1433 << ArraySize->getSourceRange();
1437 return Context.getExtVectorType(T, vectorSize);
1440 return Context.getDependentSizedExtVectorType(T, ArraySize, AttrLoc);
1443 /// \brief Build a function type.
1445 /// This routine checks the function type according to C++ rules and
1446 /// under the assumption that the result type and parameter types have
1447 /// just been instantiated from a template. It therefore duplicates
1448 /// some of the behavior of GetTypeForDeclarator, but in a much
1449 /// simpler form that is only suitable for this narrow use case.
1451 /// \param T The return type of the function.
1453 /// \param ParamTypes The parameter types of the function. This array
1454 /// will be modified to account for adjustments to the types of the
1455 /// function parameters.
1457 /// \param NumParamTypes The number of parameter types in ParamTypes.
1459 /// \param Variadic Whether this is a variadic function type.
1461 /// \param HasTrailingReturn Whether this function has a trailing return type.
1463 /// \param Quals The cvr-qualifiers to be applied to the function type.
1465 /// \param Loc The location of the entity whose type involves this
1466 /// function type or, if there is no such entity, the location of the
1467 /// type that will have function type.
1469 /// \param Entity The name of the entity that involves the function
1472 /// \returns A suitable function type, if there are no
1473 /// errors. Otherwise, returns a NULL type.
1474 QualType Sema::BuildFunctionType(QualType T,
1475 QualType *ParamTypes,
1476 unsigned NumParamTypes,
1477 bool Variadic, bool HasTrailingReturn,
1479 RefQualifierKind RefQualifier,
1480 SourceLocation Loc, DeclarationName Entity,
1481 FunctionType::ExtInfo Info) {
1482 if (T->isArrayType() || T->isFunctionType()) {
1483 Diag(Loc, diag::err_func_returning_array_function)
1484 << T->isFunctionType() << T;
1488 // Functions cannot return half FP.
1489 if (T->isHalfType()) {
1490 Diag(Loc, diag::err_parameters_retval_cannot_have_fp16_type) << 1 <<
1491 FixItHint::CreateInsertion(Loc, "*");
1495 bool Invalid = false;
1496 for (unsigned Idx = 0; Idx < NumParamTypes; ++Idx) {
1497 // FIXME: Loc is too inprecise here, should use proper locations for args.
1498 QualType ParamType = Context.getAdjustedParameterType(ParamTypes[Idx]);
1499 if (ParamType->isVoidType()) {
1500 Diag(Loc, diag::err_param_with_void_type);
1502 } else if (ParamType->isHalfType()) {
1503 // Disallow half FP arguments.
1504 Diag(Loc, diag::err_parameters_retval_cannot_have_fp16_type) << 0 <<
1505 FixItHint::CreateInsertion(Loc, "*");
1509 ParamTypes[Idx] = ParamType;
1515 FunctionProtoType::ExtProtoInfo EPI;
1516 EPI.Variadic = Variadic;
1517 EPI.HasTrailingReturn = HasTrailingReturn;
1518 EPI.TypeQuals = Quals;
1519 EPI.RefQualifier = RefQualifier;
1522 return Context.getFunctionType(T, ParamTypes, NumParamTypes, EPI);
1525 /// \brief Build a member pointer type \c T Class::*.
1527 /// \param T the type to which the member pointer refers.
1528 /// \param Class the class type into which the member pointer points.
1529 /// \param Loc the location where this type begins
1530 /// \param Entity the name of the entity that will have this member pointer type
1532 /// \returns a member pointer type, if successful, or a NULL type if there was
1534 QualType Sema::BuildMemberPointerType(QualType T, QualType Class,
1536 DeclarationName Entity) {
1537 // Verify that we're not building a pointer to pointer to function with
1538 // exception specification.
1539 if (CheckDistantExceptionSpec(T)) {
1540 Diag(Loc, diag::err_distant_exception_spec);
1542 // FIXME: If we're doing this as part of template instantiation,
1543 // we should return immediately.
1545 // Build the type anyway, but use the canonical type so that the
1546 // exception specifiers are stripped off.
1547 T = Context.getCanonicalType(T);
1550 // C++ 8.3.3p3: A pointer to member shall not point to ... a member
1551 // with reference type, or "cv void."
1552 if (T->isReferenceType()) {
1553 Diag(Loc, diag::err_illegal_decl_mempointer_to_reference)
1554 << (Entity? Entity.getAsString() : "type name") << T;
1558 if (T->isVoidType()) {
1559 Diag(Loc, diag::err_illegal_decl_mempointer_to_void)
1560 << (Entity? Entity.getAsString() : "type name");
1564 if (!Class->isDependentType() && !Class->isRecordType()) {
1565 Diag(Loc, diag::err_mempointer_in_nonclass_type) << Class;
1569 // In the Microsoft ABI, the class is allowed to be an incomplete
1570 // type. In such cases, the compiler makes a worst-case assumption.
1571 // We make no such assumption right now, so emit an error if the
1572 // class isn't a complete type.
1573 if (Context.getTargetInfo().getCXXABI() == CXXABI_Microsoft &&
1574 RequireCompleteType(Loc, Class, diag::err_incomplete_type))
1577 return Context.getMemberPointerType(T, Class.getTypePtr());
1580 /// \brief Build a block pointer type.
1582 /// \param T The type to which we'll be building a block pointer.
1584 /// \param CVR The cvr-qualifiers to be applied to the block pointer type.
1586 /// \param Loc The location of the entity whose type involves this
1587 /// block pointer type or, if there is no such entity, the location of the
1588 /// type that will have block pointer type.
1590 /// \param Entity The name of the entity that involves the block pointer
1593 /// \returns A suitable block pointer type, if there are no
1594 /// errors. Otherwise, returns a NULL type.
1595 QualType Sema::BuildBlockPointerType(QualType T,
1597 DeclarationName Entity) {
1598 if (!T->isFunctionType()) {
1599 Diag(Loc, diag::err_nonfunction_block_type);
1603 return Context.getBlockPointerType(T);
1606 QualType Sema::GetTypeFromParser(ParsedType Ty, TypeSourceInfo **TInfo) {
1607 QualType QT = Ty.get();
1609 if (TInfo) *TInfo = 0;
1613 TypeSourceInfo *DI = 0;
1614 if (const LocInfoType *LIT = dyn_cast<LocInfoType>(QT)) {
1615 QT = LIT->getType();
1616 DI = LIT->getTypeSourceInfo();
1619 if (TInfo) *TInfo = DI;
1623 static void transferARCOwnershipToDeclaratorChunk(TypeProcessingState &state,
1624 Qualifiers::ObjCLifetime ownership,
1625 unsigned chunkIndex);
1627 /// Given that this is the declaration of a parameter under ARC,
1628 /// attempt to infer attributes and such for pointer-to-whatever
1630 static void inferARCWriteback(TypeProcessingState &state,
1631 QualType &declSpecType) {
1632 Sema &S = state.getSema();
1633 Declarator &declarator = state.getDeclarator();
1635 // TODO: should we care about decl qualifiers?
1637 // Check whether the declarator has the expected form. We walk
1638 // from the inside out in order to make the block logic work.
1639 unsigned outermostPointerIndex = 0;
1640 bool isBlockPointer = false;
1641 unsigned numPointers = 0;
1642 for (unsigned i = 0, e = declarator.getNumTypeObjects(); i != e; ++i) {
1643 unsigned chunkIndex = i;
1644 DeclaratorChunk &chunk = declarator.getTypeObject(chunkIndex);
1645 switch (chunk.Kind) {
1646 case DeclaratorChunk::Paren:
1650 case DeclaratorChunk::Reference:
1651 case DeclaratorChunk::Pointer:
1652 // Count the number of pointers. Treat references
1653 // interchangeably as pointers; if they're mis-ordered, normal
1654 // type building will discover that.
1655 outermostPointerIndex = chunkIndex;
1659 case DeclaratorChunk::BlockPointer:
1660 // If we have a pointer to block pointer, that's an acceptable
1661 // indirect reference; anything else is not an application of
1663 if (numPointers != 1) return;
1665 outermostPointerIndex = chunkIndex;
1666 isBlockPointer = true;
1668 // We don't care about pointer structure in return values here.
1671 case DeclaratorChunk::Array: // suppress if written (id[])?
1672 case DeclaratorChunk::Function:
1673 case DeclaratorChunk::MemberPointer:
1679 // If we have *one* pointer, then we want to throw the qualifier on
1680 // the declaration-specifiers, which means that it needs to be a
1681 // retainable object type.
1682 if (numPointers == 1) {
1683 // If it's not a retainable object type, the rule doesn't apply.
1684 if (!declSpecType->isObjCRetainableType()) return;
1686 // If it already has lifetime, don't do anything.
1687 if (declSpecType.getObjCLifetime()) return;
1689 // Otherwise, modify the type in-place.
1692 if (declSpecType->isObjCARCImplicitlyUnretainedType())
1693 qs.addObjCLifetime(Qualifiers::OCL_ExplicitNone);
1695 qs.addObjCLifetime(Qualifiers::OCL_Autoreleasing);
1696 declSpecType = S.Context.getQualifiedType(declSpecType, qs);
1698 // If we have *two* pointers, then we want to throw the qualifier on
1699 // the outermost pointer.
1700 } else if (numPointers == 2) {
1701 // If we don't have a block pointer, we need to check whether the
1702 // declaration-specifiers gave us something that will turn into a
1703 // retainable object pointer after we slap the first pointer on it.
1704 if (!isBlockPointer && !declSpecType->isObjCObjectType())
1707 // Look for an explicit lifetime attribute there.
1708 DeclaratorChunk &chunk = declarator.getTypeObject(outermostPointerIndex);
1709 if (chunk.Kind != DeclaratorChunk::Pointer &&
1710 chunk.Kind != DeclaratorChunk::BlockPointer)
1712 for (const AttributeList *attr = chunk.getAttrs(); attr;
1713 attr = attr->getNext())
1714 if (attr->getKind() == AttributeList::AT_objc_ownership)
1717 transferARCOwnershipToDeclaratorChunk(state, Qualifiers::OCL_Autoreleasing,
1718 outermostPointerIndex);
1720 // Any other number of pointers/references does not trigger the rule.
1723 // TODO: mark whether we did this inference?
1726 static void DiagnoseIgnoredQualifiers(unsigned Quals,
1727 SourceLocation ConstQualLoc,
1728 SourceLocation VolatileQualLoc,
1729 SourceLocation RestrictQualLoc,
1731 std::string QualStr;
1732 unsigned NumQuals = 0;
1735 FixItHint ConstFixIt;
1736 FixItHint VolatileFixIt;
1737 FixItHint RestrictFixIt;
1739 const SourceManager &SM = S.getSourceManager();
1741 // FIXME: The locations here are set kind of arbitrarily. It'd be nicer to
1742 // find a range and grow it to encompass all the qualifiers, regardless of
1743 // the order in which they textually appear.
1744 if (Quals & Qualifiers::Const) {
1745 ConstFixIt = FixItHint::CreateRemoval(ConstQualLoc);
1748 if (!Loc.isValid() || SM.isBeforeInTranslationUnit(ConstQualLoc, Loc))
1751 if (Quals & Qualifiers::Volatile) {
1752 VolatileFixIt = FixItHint::CreateRemoval(VolatileQualLoc);
1753 QualStr += (NumQuals == 0 ? "volatile" : " volatile");
1755 if (!Loc.isValid() || SM.isBeforeInTranslationUnit(VolatileQualLoc, Loc))
1756 Loc = VolatileQualLoc;
1758 if (Quals & Qualifiers::Restrict) {
1759 RestrictFixIt = FixItHint::CreateRemoval(RestrictQualLoc);
1760 QualStr += (NumQuals == 0 ? "restrict" : " restrict");
1762 if (!Loc.isValid() || SM.isBeforeInTranslationUnit(RestrictQualLoc, Loc))
1763 Loc = RestrictQualLoc;
1766 assert(NumQuals > 0 && "No known qualifiers?");
1768 S.Diag(Loc, diag::warn_qual_return_type)
1769 << QualStr << NumQuals << ConstFixIt << VolatileFixIt << RestrictFixIt;
1772 static QualType GetDeclSpecTypeForDeclarator(TypeProcessingState &state,
1773 TypeSourceInfo *&ReturnTypeInfo) {
1774 Sema &SemaRef = state.getSema();
1775 Declarator &D = state.getDeclarator();
1779 // The TagDecl owned by the DeclSpec.
1780 TagDecl *OwnedTagDecl = 0;
1782 switch (D.getName().getKind()) {
1783 case UnqualifiedId::IK_ImplicitSelfParam:
1784 case UnqualifiedId::IK_OperatorFunctionId:
1785 case UnqualifiedId::IK_Identifier:
1786 case UnqualifiedId::IK_LiteralOperatorId:
1787 case UnqualifiedId::IK_TemplateId:
1788 T = ConvertDeclSpecToType(state);
1790 if (!D.isInvalidType() && D.getDeclSpec().isTypeSpecOwned()) {
1791 OwnedTagDecl = cast<TagDecl>(D.getDeclSpec().getRepAsDecl());
1792 // Owned declaration is embedded in declarator.
1793 OwnedTagDecl->setEmbeddedInDeclarator(true);
1797 case UnqualifiedId::IK_ConstructorName:
1798 case UnqualifiedId::IK_ConstructorTemplateId:
1799 case UnqualifiedId::IK_DestructorName:
1800 // Constructors and destructors don't have return types. Use
1802 T = SemaRef.Context.VoidTy;
1805 case UnqualifiedId::IK_ConversionFunctionId:
1806 // The result type of a conversion function is the type that it
1808 T = SemaRef.GetTypeFromParser(D.getName().ConversionFunctionId,
1813 if (D.getAttributes())
1814 distributeTypeAttrsFromDeclarator(state, T);
1816 // C++11 [dcl.spec.auto]p5: reject 'auto' if it is not in an allowed context.
1817 // In C++11, a function declarator using 'auto' must have a trailing return
1818 // type (this is checked later) and we can skip this. In other languages
1819 // using auto, we need to check regardless.
1820 if (D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_auto &&
1821 (!SemaRef.getLangOpts().CPlusPlus0x || !D.isFunctionDeclarator())) {
1824 switch (D.getContext()) {
1825 case Declarator::KNRTypeListContext:
1826 llvm_unreachable("K&R type lists aren't allowed in C++");
1827 case Declarator::LambdaExprContext:
1828 llvm_unreachable("Can't specify a type specifier in lambda grammar");
1829 case Declarator::ObjCParameterContext:
1830 case Declarator::ObjCResultContext:
1831 case Declarator::PrototypeContext:
1832 Error = 0; // Function prototype
1834 case Declarator::MemberContext:
1835 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_static)
1837 switch (cast<TagDecl>(SemaRef.CurContext)->getTagKind()) {
1838 case TTK_Enum: llvm_unreachable("unhandled tag kind");
1839 case TTK_Struct: Error = 1; /* Struct member */ break;
1840 case TTK_Union: Error = 2; /* Union member */ break;
1841 case TTK_Class: Error = 3; /* Class member */ break;
1844 case Declarator::CXXCatchContext:
1845 case Declarator::ObjCCatchContext:
1846 Error = 4; // Exception declaration
1848 case Declarator::TemplateParamContext:
1849 Error = 5; // Template parameter
1851 case Declarator::BlockLiteralContext:
1852 Error = 6; // Block literal
1854 case Declarator::TemplateTypeArgContext:
1855 Error = 7; // Template type argument
1857 case Declarator::AliasDeclContext:
1858 case Declarator::AliasTemplateContext:
1859 Error = 9; // Type alias
1861 case Declarator::TrailingReturnContext:
1862 Error = 10; // Function return type
1864 case Declarator::TypeNameContext:
1865 Error = 11; // Generic
1867 case Declarator::FileContext:
1868 case Declarator::BlockContext:
1869 case Declarator::ForContext:
1870 case Declarator::ConditionContext:
1871 case Declarator::CXXNewContext:
1875 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef)
1878 // In Objective-C it is an error to use 'auto' on a function declarator.
1879 if (D.isFunctionDeclarator())
1882 // C++11 [dcl.spec.auto]p2: 'auto' is always fine if the declarator
1883 // contains a trailing return type. That is only legal at the outermost
1884 // level. Check all declarator chunks (outermost first) anyway, to give
1885 // better diagnostics.
1886 if (SemaRef.getLangOpts().CPlusPlus0x && Error != -1) {
1887 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) {
1888 unsigned chunkIndex = e - i - 1;
1889 state.setCurrentChunkIndex(chunkIndex);
1890 DeclaratorChunk &DeclType = D.getTypeObject(chunkIndex);
1891 if (DeclType.Kind == DeclaratorChunk::Function) {
1892 const DeclaratorChunk::FunctionTypeInfo &FTI = DeclType.Fun;
1893 if (FTI.TrailingReturnType) {
1902 SemaRef.Diag(D.getDeclSpec().getTypeSpecTypeLoc(),
1903 diag::err_auto_not_allowed)
1905 T = SemaRef.Context.IntTy;
1906 D.setInvalidType(true);
1908 SemaRef.Diag(D.getDeclSpec().getTypeSpecTypeLoc(),
1909 diag::warn_cxx98_compat_auto_type_specifier);
1912 if (SemaRef.getLangOpts().CPlusPlus &&
1913 OwnedTagDecl && OwnedTagDecl->isCompleteDefinition()) {
1914 // Check the contexts where C++ forbids the declaration of a new class
1915 // or enumeration in a type-specifier-seq.
1916 switch (D.getContext()) {
1917 case Declarator::TrailingReturnContext:
1918 // Class and enumeration definitions are syntactically not allowed in
1919 // trailing return types.
1920 llvm_unreachable("parser should not have allowed this");
1922 case Declarator::FileContext:
1923 case Declarator::MemberContext:
1924 case Declarator::BlockContext:
1925 case Declarator::ForContext:
1926 case Declarator::BlockLiteralContext:
1927 case Declarator::LambdaExprContext:
1928 // C++11 [dcl.type]p3:
1929 // A type-specifier-seq shall not define a class or enumeration unless
1930 // it appears in the type-id of an alias-declaration (7.1.3) that is not
1931 // the declaration of a template-declaration.
1932 case Declarator::AliasDeclContext:
1934 case Declarator::AliasTemplateContext:
1935 SemaRef.Diag(OwnedTagDecl->getLocation(),
1936 diag::err_type_defined_in_alias_template)
1937 << SemaRef.Context.getTypeDeclType(OwnedTagDecl);
1939 case Declarator::TypeNameContext:
1940 case Declarator::TemplateParamContext:
1941 case Declarator::CXXNewContext:
1942 case Declarator::CXXCatchContext:
1943 case Declarator::ObjCCatchContext:
1944 case Declarator::TemplateTypeArgContext:
1945 SemaRef.Diag(OwnedTagDecl->getLocation(),
1946 diag::err_type_defined_in_type_specifier)
1947 << SemaRef.Context.getTypeDeclType(OwnedTagDecl);
1949 case Declarator::PrototypeContext:
1950 case Declarator::ObjCParameterContext:
1951 case Declarator::ObjCResultContext:
1952 case Declarator::KNRTypeListContext:
1954 // Types shall not be defined in return or parameter types.
1955 SemaRef.Diag(OwnedTagDecl->getLocation(),
1956 diag::err_type_defined_in_param_type)
1957 << SemaRef.Context.getTypeDeclType(OwnedTagDecl);
1959 case Declarator::ConditionContext:
1961 // The type-specifier-seq shall not contain typedef and shall not declare
1962 // a new class or enumeration.
1963 SemaRef.Diag(OwnedTagDecl->getLocation(),
1964 diag::err_type_defined_in_condition);
1972 static std::string getFunctionQualifiersAsString(const FunctionProtoType *FnTy){
1974 Qualifiers::fromCVRMask(FnTy->getTypeQuals()).getAsString();
1976 switch (FnTy->getRefQualifier()) {
1996 /// Check that the function type T, which has a cv-qualifier or a ref-qualifier,
1997 /// can be contained within the declarator chunk DeclType, and produce an
1998 /// appropriate diagnostic if not.
1999 static void checkQualifiedFunction(Sema &S, QualType T,
2000 DeclaratorChunk &DeclType) {
2001 // C++98 [dcl.fct]p4 / C++11 [dcl.fct]p6: a function type with a
2002 // cv-qualifier or a ref-qualifier can only appear at the topmost level
2005 switch (DeclType.Kind) {
2006 case DeclaratorChunk::Paren:
2007 case DeclaratorChunk::MemberPointer:
2008 // These cases are permitted.
2010 case DeclaratorChunk::Array:
2011 case DeclaratorChunk::Function:
2012 // These cases don't allow function types at all; no need to diagnose the
2013 // qualifiers separately.
2015 case DeclaratorChunk::BlockPointer:
2018 case DeclaratorChunk::Pointer:
2021 case DeclaratorChunk::Reference:
2026 assert(DiagKind != -1);
2027 S.Diag(DeclType.Loc, diag::err_compound_qualified_function_type)
2028 << DiagKind << isa<FunctionType>(T.IgnoreParens()) << T
2029 << getFunctionQualifiersAsString(T->castAs<FunctionProtoType>());
2032 static TypeSourceInfo *GetFullTypeForDeclarator(TypeProcessingState &state,
2033 QualType declSpecType,
2034 TypeSourceInfo *TInfo) {
2036 QualType T = declSpecType;
2037 Declarator &D = state.getDeclarator();
2038 Sema &S = state.getSema();
2039 ASTContext &Context = S.Context;
2040 const LangOptions &LangOpts = S.getLangOpts();
2042 bool ImplicitlyNoexcept = false;
2043 if (D.getName().getKind() == UnqualifiedId::IK_OperatorFunctionId &&
2044 LangOpts.CPlusPlus0x) {
2045 OverloadedOperatorKind OO = D.getName().OperatorFunctionId.Operator;
2046 /// In C++0x, deallocation functions (normal and array operator delete)
2047 /// are implicitly noexcept.
2048 if (OO == OO_Delete || OO == OO_Array_Delete)
2049 ImplicitlyNoexcept = true;
2052 // The name we're declaring, if any.
2053 DeclarationName Name;
2054 if (D.getIdentifier())
2055 Name = D.getIdentifier();
2057 // Does this declaration declare a typedef-name?
2058 bool IsTypedefName =
2059 D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef ||
2060 D.getContext() == Declarator::AliasDeclContext ||
2061 D.getContext() == Declarator::AliasTemplateContext;
2063 // Does T refer to a function type with a cv-qualifier or a ref-qualifier?
2064 bool IsQualifiedFunction = T->isFunctionProtoType() &&
2065 (T->castAs<FunctionProtoType>()->getTypeQuals() != 0 ||
2066 T->castAs<FunctionProtoType>()->getRefQualifier() != RQ_None);
2068 // Walk the DeclTypeInfo, building the recursive type as we go.
2069 // DeclTypeInfos are ordered from the identifier out, which is
2070 // opposite of what we want :).
2071 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) {
2072 unsigned chunkIndex = e - i - 1;
2073 state.setCurrentChunkIndex(chunkIndex);
2074 DeclaratorChunk &DeclType = D.getTypeObject(chunkIndex);
2075 if (IsQualifiedFunction) {
2076 checkQualifiedFunction(S, T, DeclType);
2077 IsQualifiedFunction = DeclType.Kind == DeclaratorChunk::Paren;
2079 switch (DeclType.Kind) {
2080 case DeclaratorChunk::Paren:
2081 T = S.BuildParenType(T);
2083 case DeclaratorChunk::BlockPointer:
2084 // If blocks are disabled, emit an error.
2085 if (!LangOpts.Blocks)
2086 S.Diag(DeclType.Loc, diag::err_blocks_disable);
2088 T = S.BuildBlockPointerType(T, D.getIdentifierLoc(), Name);
2089 if (DeclType.Cls.TypeQuals)
2090 T = S.BuildQualifiedType(T, DeclType.Loc, DeclType.Cls.TypeQuals);
2092 case DeclaratorChunk::Pointer:
2093 // Verify that we're not building a pointer to pointer to function with
2094 // exception specification.
2095 if (LangOpts.CPlusPlus && S.CheckDistantExceptionSpec(T)) {
2096 S.Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec);
2097 D.setInvalidType(true);
2098 // Build the type anyway.
2100 if (LangOpts.ObjC1 && T->getAs<ObjCObjectType>()) {
2101 T = Context.getObjCObjectPointerType(T);
2102 if (DeclType.Ptr.TypeQuals)
2103 T = S.BuildQualifiedType(T, DeclType.Loc, DeclType.Ptr.TypeQuals);
2106 T = S.BuildPointerType(T, DeclType.Loc, Name);
2107 if (DeclType.Ptr.TypeQuals)
2108 T = S.BuildQualifiedType(T, DeclType.Loc, DeclType.Ptr.TypeQuals);
2111 case DeclaratorChunk::Reference: {
2112 // Verify that we're not building a reference to pointer to function with
2113 // exception specification.
2114 if (LangOpts.CPlusPlus && S.CheckDistantExceptionSpec(T)) {
2115 S.Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec);
2116 D.setInvalidType(true);
2117 // Build the type anyway.
2119 T = S.BuildReferenceType(T, DeclType.Ref.LValueRef, DeclType.Loc, Name);
2122 if (DeclType.Ref.HasRestrict)
2123 T = S.BuildQualifiedType(T, DeclType.Loc, Qualifiers::Restrict);
2126 case DeclaratorChunk::Array: {
2127 // Verify that we're not building an array of pointers to function with
2128 // exception specification.
2129 if (LangOpts.CPlusPlus && S.CheckDistantExceptionSpec(T)) {
2130 S.Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec);
2131 D.setInvalidType(true);
2132 // Build the type anyway.
2134 DeclaratorChunk::ArrayTypeInfo &ATI = DeclType.Arr;
2135 Expr *ArraySize = static_cast<Expr*>(ATI.NumElts);
2136 ArrayType::ArraySizeModifier ASM;
2138 ASM = ArrayType::Star;
2139 else if (ATI.hasStatic)
2140 ASM = ArrayType::Static;
2142 ASM = ArrayType::Normal;
2143 if (ASM == ArrayType::Star && !D.isPrototypeContext()) {
2144 // FIXME: This check isn't quite right: it allows star in prototypes
2145 // for function definitions, and disallows some edge cases detailed
2146 // in http://gcc.gnu.org/ml/gcc-patches/2009-02/msg00133.html
2147 S.Diag(DeclType.Loc, diag::err_array_star_outside_prototype);
2148 ASM = ArrayType::Normal;
2149 D.setInvalidType(true);
2151 T = S.BuildArrayType(T, ASM, ArraySize, ATI.TypeQuals,
2152 SourceRange(DeclType.Loc, DeclType.EndLoc), Name);
2155 case DeclaratorChunk::Function: {
2156 // If the function declarator has a prototype (i.e. it is not () and
2157 // does not have a K&R-style identifier list), then the arguments are part
2158 // of the type, otherwise the argument list is ().
2159 const DeclaratorChunk::FunctionTypeInfo &FTI = DeclType.Fun;
2160 IsQualifiedFunction = FTI.TypeQuals || FTI.hasRefQualifier();
2162 // Check for auto functions and trailing return type and adjust the
2163 // return type accordingly.
2164 if (!D.isInvalidType()) {
2165 // trailing-return-type is only required if we're declaring a function,
2166 // and not, for instance, a pointer to a function.
2167 if (D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_auto &&
2168 !FTI.TrailingReturnType && chunkIndex == 0) {
2169 S.Diag(D.getDeclSpec().getTypeSpecTypeLoc(),
2170 diag::err_auto_missing_trailing_return);
2172 D.setInvalidType(true);
2173 } else if (FTI.TrailingReturnType) {
2174 // T must be exactly 'auto' at this point. See CWG issue 681.
2175 if (isa<ParenType>(T)) {
2176 S.Diag(D.getDeclSpec().getTypeSpecTypeLoc(),
2177 diag::err_trailing_return_in_parens)
2178 << T << D.getDeclSpec().getSourceRange();
2179 D.setInvalidType(true);
2180 } else if (D.getContext() != Declarator::LambdaExprContext &&
2181 (T.hasQualifiers() || !isa<AutoType>(T))) {
2182 S.Diag(D.getDeclSpec().getTypeSpecTypeLoc(),
2183 diag::err_trailing_return_without_auto)
2184 << T << D.getDeclSpec().getSourceRange();
2185 D.setInvalidType(true);
2188 T = S.GetTypeFromParser(
2189 ParsedType::getFromOpaquePtr(FTI.TrailingReturnType),
2194 // C99 6.7.5.3p1: The return type may not be a function or array type.
2195 // For conversion functions, we'll diagnose this particular error later.
2196 if ((T->isArrayType() || T->isFunctionType()) &&
2197 (D.getName().getKind() != UnqualifiedId::IK_ConversionFunctionId)) {
2198 unsigned diagID = diag::err_func_returning_array_function;
2199 // Last processing chunk in block context means this function chunk
2200 // represents the block.
2201 if (chunkIndex == 0 &&
2202 D.getContext() == Declarator::BlockLiteralContext)
2203 diagID = diag::err_block_returning_array_function;
2204 S.Diag(DeclType.Loc, diagID) << T->isFunctionType() << T;
2206 D.setInvalidType(true);
2209 // Do not allow returning half FP value.
2210 // FIXME: This really should be in BuildFunctionType.
2211 if (T->isHalfType()) {
2212 S.Diag(D.getIdentifierLoc(),
2213 diag::err_parameters_retval_cannot_have_fp16_type) << 1
2214 << FixItHint::CreateInsertion(D.getIdentifierLoc(), "*");
2215 D.setInvalidType(true);
2218 // cv-qualifiers on return types are pointless except when the type is a
2219 // class type in C++.
2220 if (isa<PointerType>(T) && T.getLocalCVRQualifiers() &&
2221 (D.getName().getKind() != UnqualifiedId::IK_ConversionFunctionId) &&
2222 (!LangOpts.CPlusPlus || !T->isDependentType())) {
2223 assert(chunkIndex + 1 < e && "No DeclaratorChunk for the return type?");
2224 DeclaratorChunk ReturnTypeChunk = D.getTypeObject(chunkIndex + 1);
2225 assert(ReturnTypeChunk.Kind == DeclaratorChunk::Pointer);
2227 DeclaratorChunk::PointerTypeInfo &PTI = ReturnTypeChunk.Ptr;
2229 DiagnoseIgnoredQualifiers(PTI.TypeQuals,
2230 SourceLocation::getFromRawEncoding(PTI.ConstQualLoc),
2231 SourceLocation::getFromRawEncoding(PTI.VolatileQualLoc),
2232 SourceLocation::getFromRawEncoding(PTI.RestrictQualLoc),
2235 } else if (T.getCVRQualifiers() && D.getDeclSpec().getTypeQualifiers() &&
2236 (!LangOpts.CPlusPlus ||
2237 (!T->isDependentType() && !T->isRecordType()))) {
2239 DiagnoseIgnoredQualifiers(D.getDeclSpec().getTypeQualifiers(),
2240 D.getDeclSpec().getConstSpecLoc(),
2241 D.getDeclSpec().getVolatileSpecLoc(),
2242 D.getDeclSpec().getRestrictSpecLoc(),
2246 if (LangOpts.CPlusPlus && D.getDeclSpec().isTypeSpecOwned()) {
2248 // Types shall not be defined in return or parameter types.
2249 TagDecl *Tag = cast<TagDecl>(D.getDeclSpec().getRepAsDecl());
2250 if (Tag->isCompleteDefinition())
2251 S.Diag(Tag->getLocation(), diag::err_type_defined_in_result_type)
2252 << Context.getTypeDeclType(Tag);
2255 // Exception specs are not allowed in typedefs. Complain, but add it
2257 if (IsTypedefName && FTI.getExceptionSpecType())
2258 S.Diag(FTI.getExceptionSpecLoc(), diag::err_exception_spec_in_typedef)
2259 << (D.getContext() == Declarator::AliasDeclContext ||
2260 D.getContext() == Declarator::AliasTemplateContext);
2262 if (!FTI.NumArgs && !FTI.isVariadic && !LangOpts.CPlusPlus) {
2263 // Simple void foo(), where the incoming T is the result type.
2264 T = Context.getFunctionNoProtoType(T);
2266 // We allow a zero-parameter variadic function in C if the
2267 // function is marked with the "overloadable" attribute. Scan
2268 // for this attribute now.
2269 if (!FTI.NumArgs && FTI.isVariadic && !LangOpts.CPlusPlus) {
2270 bool Overloadable = false;
2271 for (const AttributeList *Attrs = D.getAttributes();
2272 Attrs; Attrs = Attrs->getNext()) {
2273 if (Attrs->getKind() == AttributeList::AT_overloadable) {
2274 Overloadable = true;
2280 S.Diag(FTI.getEllipsisLoc(), diag::err_ellipsis_first_arg);
2283 if (FTI.NumArgs && FTI.ArgInfo[0].Param == 0) {
2284 // C99 6.7.5.3p3: Reject int(x,y,z) when it's not a function
2286 S.Diag(FTI.ArgInfo[0].IdentLoc, diag::err_ident_list_in_fn_declaration);
2287 D.setInvalidType(true);
2291 FunctionProtoType::ExtProtoInfo EPI;
2292 EPI.Variadic = FTI.isVariadic;
2293 EPI.HasTrailingReturn = FTI.TrailingReturnType;
2294 EPI.TypeQuals = FTI.TypeQuals;
2295 EPI.RefQualifier = !FTI.hasRefQualifier()? RQ_None
2296 : FTI.RefQualifierIsLValueRef? RQ_LValue
2299 // Otherwise, we have a function with an argument list that is
2300 // potentially variadic.
2301 SmallVector<QualType, 16> ArgTys;
2302 ArgTys.reserve(FTI.NumArgs);
2304 SmallVector<bool, 16> ConsumedArguments;
2305 ConsumedArguments.reserve(FTI.NumArgs);
2306 bool HasAnyConsumedArguments = false;
2308 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) {
2309 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[i].Param);
2310 QualType ArgTy = Param->getType();
2311 assert(!ArgTy.isNull() && "Couldn't parse type?");
2313 // Adjust the parameter type.
2314 assert((ArgTy == Context.getAdjustedParameterType(ArgTy)) &&
2315 "Unadjusted type?");
2317 // Look for 'void'. void is allowed only as a single argument to a
2318 // function with no other parameters (C99 6.7.5.3p10). We record
2319 // int(void) as a FunctionProtoType with an empty argument list.
2320 if (ArgTy->isVoidType()) {
2321 // If this is something like 'float(int, void)', reject it. 'void'
2322 // is an incomplete type (C99 6.2.5p19) and function decls cannot
2323 // have arguments of incomplete type.
2324 if (FTI.NumArgs != 1 || FTI.isVariadic) {
2325 S.Diag(DeclType.Loc, diag::err_void_only_param);
2326 ArgTy = Context.IntTy;
2327 Param->setType(ArgTy);
2328 } else if (FTI.ArgInfo[i].Ident) {
2329 // Reject, but continue to parse 'int(void abc)'.
2330 S.Diag(FTI.ArgInfo[i].IdentLoc,
2331 diag::err_param_with_void_type);
2332 ArgTy = Context.IntTy;
2333 Param->setType(ArgTy);
2335 // Reject, but continue to parse 'float(const void)'.
2336 if (ArgTy.hasQualifiers())
2337 S.Diag(DeclType.Loc, diag::err_void_param_qualified);
2339 // Do not add 'void' to the ArgTys list.
2342 } else if (ArgTy->isHalfType()) {
2343 // Disallow half FP arguments.
2344 // FIXME: This really should be in BuildFunctionType.
2345 S.Diag(Param->getLocation(),
2346 diag::err_parameters_retval_cannot_have_fp16_type) << 0
2347 << FixItHint::CreateInsertion(Param->getLocation(), "*");
2349 } else if (!FTI.hasPrototype) {
2350 if (ArgTy->isPromotableIntegerType()) {
2351 ArgTy = Context.getPromotedIntegerType(ArgTy);
2352 Param->setKNRPromoted(true);
2353 } else if (const BuiltinType* BTy = ArgTy->getAs<BuiltinType>()) {
2354 if (BTy->getKind() == BuiltinType::Float) {
2355 ArgTy = Context.DoubleTy;
2356 Param->setKNRPromoted(true);
2361 if (LangOpts.ObjCAutoRefCount) {
2362 bool Consumed = Param->hasAttr<NSConsumedAttr>();
2363 ConsumedArguments.push_back(Consumed);
2364 HasAnyConsumedArguments |= Consumed;
2367 ArgTys.push_back(ArgTy);
2370 if (HasAnyConsumedArguments)
2371 EPI.ConsumedArguments = ConsumedArguments.data();
2373 SmallVector<QualType, 4> Exceptions;
2374 SmallVector<ParsedType, 2> DynamicExceptions;
2375 SmallVector<SourceRange, 2> DynamicExceptionRanges;
2376 Expr *NoexceptExpr = 0;
2378 if (FTI.getExceptionSpecType() == EST_Dynamic) {
2379 // FIXME: It's rather inefficient to have to split into two vectors
2381 unsigned N = FTI.NumExceptions;
2382 DynamicExceptions.reserve(N);
2383 DynamicExceptionRanges.reserve(N);
2384 for (unsigned I = 0; I != N; ++I) {
2385 DynamicExceptions.push_back(FTI.Exceptions[I].Ty);
2386 DynamicExceptionRanges.push_back(FTI.Exceptions[I].Range);
2388 } else if (FTI.getExceptionSpecType() == EST_ComputedNoexcept) {
2389 NoexceptExpr = FTI.NoexceptExpr;
2392 S.checkExceptionSpecification(FTI.getExceptionSpecType(),
2394 DynamicExceptionRanges,
2399 if (FTI.getExceptionSpecType() == EST_None &&
2400 ImplicitlyNoexcept && chunkIndex == 0) {
2401 // Only the outermost chunk is marked noexcept, of course.
2402 EPI.ExceptionSpecType = EST_BasicNoexcept;
2405 T = Context.getFunctionType(T, ArgTys.data(), ArgTys.size(), EPI);
2410 case DeclaratorChunk::MemberPointer:
2411 // The scope spec must refer to a class, or be dependent.
2412 CXXScopeSpec &SS = DeclType.Mem.Scope();
2414 if (SS.isInvalid()) {
2415 // Avoid emitting extra errors if we already errored on the scope.
2416 D.setInvalidType(true);
2417 } else if (S.isDependentScopeSpecifier(SS) ||
2418 dyn_cast_or_null<CXXRecordDecl>(S.computeDeclContext(SS))) {
2419 NestedNameSpecifier *NNS
2420 = static_cast<NestedNameSpecifier*>(SS.getScopeRep());
2421 NestedNameSpecifier *NNSPrefix = NNS->getPrefix();
2422 switch (NNS->getKind()) {
2423 case NestedNameSpecifier::Identifier:
2424 ClsType = Context.getDependentNameType(ETK_None, NNSPrefix,
2425 NNS->getAsIdentifier());
2428 case NestedNameSpecifier::Namespace:
2429 case NestedNameSpecifier::NamespaceAlias:
2430 case NestedNameSpecifier::Global:
2431 llvm_unreachable("Nested-name-specifier must name a type");
2433 case NestedNameSpecifier::TypeSpec:
2434 case NestedNameSpecifier::TypeSpecWithTemplate:
2435 ClsType = QualType(NNS->getAsType(), 0);
2436 // Note: if the NNS has a prefix and ClsType is a nondependent
2437 // TemplateSpecializationType, then the NNS prefix is NOT included
2438 // in ClsType; hence we wrap ClsType into an ElaboratedType.
2439 // NOTE: in particular, no wrap occurs if ClsType already is an
2440 // Elaborated, DependentName, or DependentTemplateSpecialization.
2441 if (NNSPrefix && isa<TemplateSpecializationType>(NNS->getAsType()))
2442 ClsType = Context.getElaboratedType(ETK_None, NNSPrefix, ClsType);
2446 S.Diag(DeclType.Mem.Scope().getBeginLoc(),
2447 diag::err_illegal_decl_mempointer_in_nonclass)
2448 << (D.getIdentifier() ? D.getIdentifier()->getName() : "type name")
2449 << DeclType.Mem.Scope().getRange();
2450 D.setInvalidType(true);
2453 if (!ClsType.isNull())
2454 T = S.BuildMemberPointerType(T, ClsType, DeclType.Loc, D.getIdentifier());
2457 D.setInvalidType(true);
2458 } else if (DeclType.Mem.TypeQuals) {
2459 T = S.BuildQualifiedType(T, DeclType.Loc, DeclType.Mem.TypeQuals);
2465 D.setInvalidType(true);
2469 // See if there are any attributes on this declarator chunk.
2470 if (AttributeList *attrs = const_cast<AttributeList*>(DeclType.getAttrs()))
2471 processTypeAttrs(state, T, false, attrs);
2474 if (LangOpts.CPlusPlus && T->isFunctionType()) {
2475 const FunctionProtoType *FnTy = T->getAs<FunctionProtoType>();
2476 assert(FnTy && "Why oh why is there not a FunctionProtoType here?");
2479 // A cv-qualifier-seq shall only be part of the function type
2480 // for a nonstatic member function, the function type to which a pointer
2481 // to member refers, or the top-level function type of a function typedef
2484 // Core issue 547 also allows cv-qualifiers on function types that are
2485 // top-level template type arguments.
2487 if (!D.getCXXScopeSpec().isSet()) {
2488 FreeFunction = ((D.getContext() != Declarator::MemberContext &&
2489 D.getContext() != Declarator::LambdaExprContext) ||
2490 D.getDeclSpec().isFriendSpecified());
2492 DeclContext *DC = S.computeDeclContext(D.getCXXScopeSpec());
2493 FreeFunction = (DC && !DC->isRecord());
2496 // C++0x [dcl.constexpr]p8: A constexpr specifier for a non-static member
2497 // function that is not a constructor declares that function to be const.
2498 if (D.getDeclSpec().isConstexprSpecified() && !FreeFunction &&
2499 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static &&
2500 D.getName().getKind() != UnqualifiedId::IK_ConstructorName &&
2501 D.getName().getKind() != UnqualifiedId::IK_ConstructorTemplateId &&
2502 !(FnTy->getTypeQuals() & DeclSpec::TQ_const)) {
2503 // Rebuild function type adding a 'const' qualifier.
2504 FunctionProtoType::ExtProtoInfo EPI = FnTy->getExtProtoInfo();
2505 EPI.TypeQuals |= DeclSpec::TQ_const;
2506 T = Context.getFunctionType(FnTy->getResultType(),
2507 FnTy->arg_type_begin(),
2508 FnTy->getNumArgs(), EPI);
2511 // C++11 [dcl.fct]p6 (w/DR1417):
2512 // An attempt to specify a function type with a cv-qualifier-seq or a
2513 // ref-qualifier (including by typedef-name) is ill-formed unless it is:
2514 // - the function type for a non-static member function,
2515 // - the function type to which a pointer to member refers,
2516 // - the top-level function type of a function typedef declaration or
2517 // alias-declaration,
2518 // - the type-id in the default argument of a type-parameter, or
2519 // - the type-id of a template-argument for a type-parameter
2520 if (IsQualifiedFunction &&
2522 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) &&
2524 D.getContext() != Declarator::TemplateTypeArgContext) {
2525 SourceLocation Loc = D.getLocStart();
2526 SourceRange RemovalRange;
2528 if (D.isFunctionDeclarator(I)) {
2529 SmallVector<SourceLocation, 4> RemovalLocs;
2530 const DeclaratorChunk &Chunk = D.getTypeObject(I);
2531 assert(Chunk.Kind == DeclaratorChunk::Function);
2532 if (Chunk.Fun.hasRefQualifier())
2533 RemovalLocs.push_back(Chunk.Fun.getRefQualifierLoc());
2534 if (Chunk.Fun.TypeQuals & Qualifiers::Const)
2535 RemovalLocs.push_back(Chunk.Fun.getConstQualifierLoc());
2536 if (Chunk.Fun.TypeQuals & Qualifiers::Volatile)
2537 RemovalLocs.push_back(Chunk.Fun.getVolatileQualifierLoc());
2538 // FIXME: We do not track the location of the __restrict qualifier.
2539 //if (Chunk.Fun.TypeQuals & Qualifiers::Restrict)
2540 // RemovalLocs.push_back(Chunk.Fun.getRestrictQualifierLoc());
2541 if (!RemovalLocs.empty()) {
2542 std::sort(RemovalLocs.begin(), RemovalLocs.end(),
2543 SourceManager::LocBeforeThanCompare(S.getSourceManager()));
2544 RemovalRange = SourceRange(RemovalLocs.front(), RemovalLocs.back());
2545 Loc = RemovalLocs.front();
2549 S.Diag(Loc, diag::err_invalid_qualified_function_type)
2550 << FreeFunction << D.isFunctionDeclarator() << T
2551 << getFunctionQualifiersAsString(FnTy)
2552 << FixItHint::CreateRemoval(RemovalRange);
2554 // Strip the cv-qualifiers and ref-qualifiers from the type.
2555 FunctionProtoType::ExtProtoInfo EPI = FnTy->getExtProtoInfo();
2557 EPI.RefQualifier = RQ_None;
2559 T = Context.getFunctionType(FnTy->getResultType(),
2560 FnTy->arg_type_begin(),
2561 FnTy->getNumArgs(), EPI);
2565 // Apply any undistributed attributes from the declarator.
2567 if (AttributeList *attrs = D.getAttributes())
2568 processTypeAttrs(state, T, false, attrs);
2570 // Diagnose any ignored type attributes.
2571 if (!T.isNull()) state.diagnoseIgnoredTypeAttrs(T);
2573 // C++0x [dcl.constexpr]p9:
2574 // A constexpr specifier used in an object declaration declares the object
2576 if (D.getDeclSpec().isConstexprSpecified() && T->isObjectType()) {
2580 // If there was an ellipsis in the declarator, the declaration declares a
2581 // parameter pack whose type may be a pack expansion type.
2582 if (D.hasEllipsis() && !T.isNull()) {
2583 // C++0x [dcl.fct]p13:
2584 // A declarator-id or abstract-declarator containing an ellipsis shall
2585 // only be used in a parameter-declaration. Such a parameter-declaration
2586 // is a parameter pack (14.5.3). [...]
2587 switch (D.getContext()) {
2588 case Declarator::PrototypeContext:
2589 // C++0x [dcl.fct]p13:
2590 // [...] When it is part of a parameter-declaration-clause, the
2591 // parameter pack is a function parameter pack (14.5.3). The type T
2592 // of the declarator-id of the function parameter pack shall contain
2593 // a template parameter pack; each template parameter pack in T is
2594 // expanded by the function parameter pack.
2596 // We represent function parameter packs as function parameters whose
2597 // type is a pack expansion.
2598 if (!T->containsUnexpandedParameterPack()) {
2599 S.Diag(D.getEllipsisLoc(),
2600 diag::err_function_parameter_pack_without_parameter_packs)
2601 << T << D.getSourceRange();
2602 D.setEllipsisLoc(SourceLocation());
2604 T = Context.getPackExpansionType(T, llvm::Optional<unsigned>());
2608 case Declarator::TemplateParamContext:
2609 // C++0x [temp.param]p15:
2610 // If a template-parameter is a [...] is a parameter-declaration that
2611 // declares a parameter pack (8.3.5), then the template-parameter is a
2612 // template parameter pack (14.5.3).
2614 // Note: core issue 778 clarifies that, if there are any unexpanded
2615 // parameter packs in the type of the non-type template parameter, then
2616 // it expands those parameter packs.
2617 if (T->containsUnexpandedParameterPack())
2618 T = Context.getPackExpansionType(T, llvm::Optional<unsigned>());
2620 S.Diag(D.getEllipsisLoc(),
2621 LangOpts.CPlusPlus0x
2622 ? diag::warn_cxx98_compat_variadic_templates
2623 : diag::ext_variadic_templates);
2626 case Declarator::FileContext:
2627 case Declarator::KNRTypeListContext:
2628 case Declarator::ObjCParameterContext: // FIXME: special diagnostic here?
2629 case Declarator::ObjCResultContext: // FIXME: special diagnostic here?
2630 case Declarator::TypeNameContext:
2631 case Declarator::CXXNewContext:
2632 case Declarator::AliasDeclContext:
2633 case Declarator::AliasTemplateContext:
2634 case Declarator::MemberContext:
2635 case Declarator::BlockContext:
2636 case Declarator::ForContext:
2637 case Declarator::ConditionContext:
2638 case Declarator::CXXCatchContext:
2639 case Declarator::ObjCCatchContext:
2640 case Declarator::BlockLiteralContext:
2641 case Declarator::LambdaExprContext:
2642 case Declarator::TrailingReturnContext:
2643 case Declarator::TemplateTypeArgContext:
2644 // FIXME: We may want to allow parameter packs in block-literal contexts
2646 S.Diag(D.getEllipsisLoc(), diag::err_ellipsis_in_declarator_not_parameter);
2647 D.setEllipsisLoc(SourceLocation());
2653 return Context.getNullTypeSourceInfo();
2654 else if (D.isInvalidType())
2655 return Context.getTrivialTypeSourceInfo(T);
2657 return S.GetTypeSourceInfoForDeclarator(D, T, TInfo);
2660 /// GetTypeForDeclarator - Convert the type for the specified
2661 /// declarator to Type instances.
2663 /// The result of this call will never be null, but the associated
2664 /// type may be a null type if there's an unrecoverable error.
2665 TypeSourceInfo *Sema::GetTypeForDeclarator(Declarator &D, Scope *S) {
2666 // Determine the type of the declarator. Not all forms of declarator
2669 TypeProcessingState state(*this, D);
2671 TypeSourceInfo *ReturnTypeInfo = 0;
2672 QualType T = GetDeclSpecTypeForDeclarator(state, ReturnTypeInfo);
2674 return Context.getNullTypeSourceInfo();
2676 if (D.isPrototypeContext() && getLangOpts().ObjCAutoRefCount)
2677 inferARCWriteback(state, T);
2679 return GetFullTypeForDeclarator(state, T, ReturnTypeInfo);
2682 static void transferARCOwnershipToDeclSpec(Sema &S,
2683 QualType &declSpecTy,
2684 Qualifiers::ObjCLifetime ownership) {
2685 if (declSpecTy->isObjCRetainableType() &&
2686 declSpecTy.getObjCLifetime() == Qualifiers::OCL_None) {
2688 qs.addObjCLifetime(ownership);
2689 declSpecTy = S.Context.getQualifiedType(declSpecTy, qs);
2693 static void transferARCOwnershipToDeclaratorChunk(TypeProcessingState &state,
2694 Qualifiers::ObjCLifetime ownership,
2695 unsigned chunkIndex) {
2696 Sema &S = state.getSema();
2697 Declarator &D = state.getDeclarator();
2699 // Look for an explicit lifetime attribute.
2700 DeclaratorChunk &chunk = D.getTypeObject(chunkIndex);
2701 for (const AttributeList *attr = chunk.getAttrs(); attr;
2702 attr = attr->getNext())
2703 if (attr->getKind() == AttributeList::AT_objc_ownership)
2706 const char *attrStr = 0;
2707 switch (ownership) {
2708 case Qualifiers::OCL_None: llvm_unreachable("no ownership!");
2709 case Qualifiers::OCL_ExplicitNone: attrStr = "none"; break;
2710 case Qualifiers::OCL_Strong: attrStr = "strong"; break;
2711 case Qualifiers::OCL_Weak: attrStr = "weak"; break;
2712 case Qualifiers::OCL_Autoreleasing: attrStr = "autoreleasing"; break;
2715 // If there wasn't one, add one (with an invalid source location
2716 // so that we don't make an AttributedType for it).
2717 AttributeList *attr = D.getAttributePool()
2718 .create(&S.Context.Idents.get("objc_ownership"), SourceLocation(),
2719 /*scope*/ 0, SourceLocation(),
2720 &S.Context.Idents.get(attrStr), SourceLocation(),
2722 /*declspec*/ false, /*C++0x*/ false);
2723 spliceAttrIntoList(*attr, chunk.getAttrListRef());
2725 // TODO: mark whether we did this inference?
2728 /// \brief Used for transfering ownership in casts resulting in l-values.
2729 static void transferARCOwnership(TypeProcessingState &state,
2730 QualType &declSpecTy,
2731 Qualifiers::ObjCLifetime ownership) {
2732 Sema &S = state.getSema();
2733 Declarator &D = state.getDeclarator();
2736 bool hasIndirection = false;
2737 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) {
2738 DeclaratorChunk &chunk = D.getTypeObject(i);
2739 switch (chunk.Kind) {
2740 case DeclaratorChunk::Paren:
2744 case DeclaratorChunk::Array:
2745 case DeclaratorChunk::Reference:
2746 case DeclaratorChunk::Pointer:
2748 hasIndirection = true;
2752 case DeclaratorChunk::BlockPointer:
2754 transferARCOwnershipToDeclaratorChunk(state, ownership, i);
2757 case DeclaratorChunk::Function:
2758 case DeclaratorChunk::MemberPointer:
2766 DeclaratorChunk &chunk = D.getTypeObject(inner);
2767 if (chunk.Kind == DeclaratorChunk::Pointer) {
2768 if (declSpecTy->isObjCRetainableType())
2769 return transferARCOwnershipToDeclSpec(S, declSpecTy, ownership);
2770 if (declSpecTy->isObjCObjectType() && hasIndirection)
2771 return transferARCOwnershipToDeclaratorChunk(state, ownership, inner);
2773 assert(chunk.Kind == DeclaratorChunk::Array ||
2774 chunk.Kind == DeclaratorChunk::Reference);
2775 return transferARCOwnershipToDeclSpec(S, declSpecTy, ownership);
2779 TypeSourceInfo *Sema::GetTypeForDeclaratorCast(Declarator &D, QualType FromTy) {
2780 TypeProcessingState state(*this, D);
2782 TypeSourceInfo *ReturnTypeInfo = 0;
2783 QualType declSpecTy = GetDeclSpecTypeForDeclarator(state, ReturnTypeInfo);
2784 if (declSpecTy.isNull())
2785 return Context.getNullTypeSourceInfo();
2787 if (getLangOpts().ObjCAutoRefCount) {
2788 Qualifiers::ObjCLifetime ownership = Context.getInnerObjCOwnership(FromTy);
2789 if (ownership != Qualifiers::OCL_None)
2790 transferARCOwnership(state, declSpecTy, ownership);
2793 return GetFullTypeForDeclarator(state, declSpecTy, ReturnTypeInfo);
2796 /// Map an AttributedType::Kind to an AttributeList::Kind.
2797 static AttributeList::Kind getAttrListKind(AttributedType::Kind kind) {
2799 case AttributedType::attr_address_space:
2800 return AttributeList::AT_address_space;
2801 case AttributedType::attr_regparm:
2802 return AttributeList::AT_regparm;
2803 case AttributedType::attr_vector_size:
2804 return AttributeList::AT_vector_size;
2805 case AttributedType::attr_neon_vector_type:
2806 return AttributeList::AT_neon_vector_type;
2807 case AttributedType::attr_neon_polyvector_type:
2808 return AttributeList::AT_neon_polyvector_type;
2809 case AttributedType::attr_objc_gc:
2810 return AttributeList::AT_objc_gc;
2811 case AttributedType::attr_objc_ownership:
2812 return AttributeList::AT_objc_ownership;
2813 case AttributedType::attr_noreturn:
2814 return AttributeList::AT_noreturn;
2815 case AttributedType::attr_cdecl:
2816 return AttributeList::AT_cdecl;
2817 case AttributedType::attr_fastcall:
2818 return AttributeList::AT_fastcall;
2819 case AttributedType::attr_stdcall:
2820 return AttributeList::AT_stdcall;
2821 case AttributedType::attr_thiscall:
2822 return AttributeList::AT_thiscall;
2823 case AttributedType::attr_pascal:
2824 return AttributeList::AT_pascal;
2825 case AttributedType::attr_pcs:
2826 return AttributeList::AT_pcs;
2828 llvm_unreachable("unexpected attribute kind!");
2831 static void fillAttributedTypeLoc(AttributedTypeLoc TL,
2832 const AttributeList *attrs) {
2833 AttributedType::Kind kind = TL.getAttrKind();
2835 assert(attrs && "no type attributes in the expected location!");
2836 AttributeList::Kind parsedKind = getAttrListKind(kind);
2837 while (attrs->getKind() != parsedKind) {
2838 attrs = attrs->getNext();
2839 assert(attrs && "no matching attribute in expected location!");
2842 TL.setAttrNameLoc(attrs->getLoc());
2843 if (TL.hasAttrExprOperand())
2844 TL.setAttrExprOperand(attrs->getArg(0));
2845 else if (TL.hasAttrEnumOperand())
2846 TL.setAttrEnumOperandLoc(attrs->getParameterLoc());
2848 // FIXME: preserve this information to here.
2849 if (TL.hasAttrOperand())
2850 TL.setAttrOperandParensRange(SourceRange());
2854 class TypeSpecLocFiller : public TypeLocVisitor<TypeSpecLocFiller> {
2855 ASTContext &Context;
2859 TypeSpecLocFiller(ASTContext &Context, const DeclSpec &DS)
2860 : Context(Context), DS(DS) {}
2862 void VisitAttributedTypeLoc(AttributedTypeLoc TL) {
2863 fillAttributedTypeLoc(TL, DS.getAttributes().getList());
2864 Visit(TL.getModifiedLoc());
2866 void VisitQualifiedTypeLoc(QualifiedTypeLoc TL) {
2867 Visit(TL.getUnqualifiedLoc());
2869 void VisitTypedefTypeLoc(TypedefTypeLoc TL) {
2870 TL.setNameLoc(DS.getTypeSpecTypeLoc());
2872 void VisitObjCInterfaceTypeLoc(ObjCInterfaceTypeLoc TL) {
2873 TL.setNameLoc(DS.getTypeSpecTypeLoc());
2875 void VisitObjCObjectTypeLoc(ObjCObjectTypeLoc TL) {
2876 // Handle the base type, which might not have been written explicitly.
2877 if (DS.getTypeSpecType() == DeclSpec::TST_unspecified) {
2878 TL.setHasBaseTypeAsWritten(false);
2879 TL.getBaseLoc().initialize(Context, SourceLocation());
2881 TL.setHasBaseTypeAsWritten(true);
2882 Visit(TL.getBaseLoc());
2885 // Protocol qualifiers.
2886 if (DS.getProtocolQualifiers()) {
2887 assert(TL.getNumProtocols() > 0);
2888 assert(TL.getNumProtocols() == DS.getNumProtocolQualifiers());
2889 TL.setLAngleLoc(DS.getProtocolLAngleLoc());
2890 TL.setRAngleLoc(DS.getSourceRange().getEnd());
2891 for (unsigned i = 0, e = DS.getNumProtocolQualifiers(); i != e; ++i)
2892 TL.setProtocolLoc(i, DS.getProtocolLocs()[i]);
2894 assert(TL.getNumProtocols() == 0);
2895 TL.setLAngleLoc(SourceLocation());
2896 TL.setRAngleLoc(SourceLocation());
2899 void VisitObjCObjectPointerTypeLoc(ObjCObjectPointerTypeLoc TL) {
2900 TL.setStarLoc(SourceLocation());
2901 Visit(TL.getPointeeLoc());
2903 void VisitTemplateSpecializationTypeLoc(TemplateSpecializationTypeLoc TL) {
2904 TypeSourceInfo *TInfo = 0;
2905 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo);
2907 // If we got no declarator info from previous Sema routines,
2908 // just fill with the typespec loc.
2910 TL.initialize(Context, DS.getTypeSpecTypeNameLoc());
2914 TypeLoc OldTL = TInfo->getTypeLoc();
2915 if (TInfo->getType()->getAs<ElaboratedType>()) {
2916 ElaboratedTypeLoc ElabTL = cast<ElaboratedTypeLoc>(OldTL);
2917 TemplateSpecializationTypeLoc NamedTL =
2918 cast<TemplateSpecializationTypeLoc>(ElabTL.getNamedTypeLoc());
2922 TL.copy(cast<TemplateSpecializationTypeLoc>(OldTL));
2924 void VisitTypeOfExprTypeLoc(TypeOfExprTypeLoc TL) {
2925 assert(DS.getTypeSpecType() == DeclSpec::TST_typeofExpr);
2926 TL.setTypeofLoc(DS.getTypeSpecTypeLoc());
2927 TL.setParensRange(DS.getTypeofParensRange());
2929 void VisitTypeOfTypeLoc(TypeOfTypeLoc TL) {
2930 assert(DS.getTypeSpecType() == DeclSpec::TST_typeofType);
2931 TL.setTypeofLoc(DS.getTypeSpecTypeLoc());
2932 TL.setParensRange(DS.getTypeofParensRange());
2933 assert(DS.getRepAsType());
2934 TypeSourceInfo *TInfo = 0;
2935 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo);
2936 TL.setUnderlyingTInfo(TInfo);
2938 void VisitUnaryTransformTypeLoc(UnaryTransformTypeLoc TL) {
2939 // FIXME: This holds only because we only have one unary transform.
2940 assert(DS.getTypeSpecType() == DeclSpec::TST_underlyingType);
2941 TL.setKWLoc(DS.getTypeSpecTypeLoc());
2942 TL.setParensRange(DS.getTypeofParensRange());
2943 assert(DS.getRepAsType());
2944 TypeSourceInfo *TInfo = 0;
2945 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo);
2946 TL.setUnderlyingTInfo(TInfo);
2948 void VisitBuiltinTypeLoc(BuiltinTypeLoc TL) {
2949 // By default, use the source location of the type specifier.
2950 TL.setBuiltinLoc(DS.getTypeSpecTypeLoc());
2951 if (TL.needsExtraLocalData()) {
2952 // Set info for the written builtin specifiers.
2953 TL.getWrittenBuiltinSpecs() = DS.getWrittenBuiltinSpecs();
2954 // Try to have a meaningful source location.
2955 if (TL.getWrittenSignSpec() != TSS_unspecified)
2956 // Sign spec loc overrides the others (e.g., 'unsigned long').
2957 TL.setBuiltinLoc(DS.getTypeSpecSignLoc());
2958 else if (TL.getWrittenWidthSpec() != TSW_unspecified)
2959 // Width spec loc overrides type spec loc (e.g., 'short int').
2960 TL.setBuiltinLoc(DS.getTypeSpecWidthLoc());
2963 void VisitElaboratedTypeLoc(ElaboratedTypeLoc TL) {
2964 ElaboratedTypeKeyword Keyword
2965 = TypeWithKeyword::getKeywordForTypeSpec(DS.getTypeSpecType());
2966 if (DS.getTypeSpecType() == TST_typename) {
2967 TypeSourceInfo *TInfo = 0;
2968 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo);
2970 TL.copy(cast<ElaboratedTypeLoc>(TInfo->getTypeLoc()));
2974 TL.setElaboratedKeywordLoc(Keyword != ETK_None
2975 ? DS.getTypeSpecTypeLoc()
2976 : SourceLocation());
2977 const CXXScopeSpec& SS = DS.getTypeSpecScope();
2978 TL.setQualifierLoc(SS.getWithLocInContext(Context));
2979 Visit(TL.getNextTypeLoc().getUnqualifiedLoc());
2981 void VisitDependentNameTypeLoc(DependentNameTypeLoc TL) {
2982 assert(DS.getTypeSpecType() == TST_typename);
2983 TypeSourceInfo *TInfo = 0;
2984 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo);
2986 TL.copy(cast<DependentNameTypeLoc>(TInfo->getTypeLoc()));
2988 void VisitDependentTemplateSpecializationTypeLoc(
2989 DependentTemplateSpecializationTypeLoc TL) {
2990 assert(DS.getTypeSpecType() == TST_typename);
2991 TypeSourceInfo *TInfo = 0;
2992 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo);
2994 TL.copy(cast<DependentTemplateSpecializationTypeLoc>(
2995 TInfo->getTypeLoc()));
2997 void VisitTagTypeLoc(TagTypeLoc TL) {
2998 TL.setNameLoc(DS.getTypeSpecTypeNameLoc());
3000 void VisitAtomicTypeLoc(AtomicTypeLoc TL) {
3001 TL.setKWLoc(DS.getTypeSpecTypeLoc());
3002 TL.setParensRange(DS.getTypeofParensRange());
3004 TypeSourceInfo *TInfo = 0;
3005 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo);
3006 TL.getValueLoc().initializeFullCopy(TInfo->getTypeLoc());
3009 void VisitTypeLoc(TypeLoc TL) {
3010 // FIXME: add other typespec types and change this to an assert.
3011 TL.initialize(Context, DS.getTypeSpecTypeLoc());
3015 class DeclaratorLocFiller : public TypeLocVisitor<DeclaratorLocFiller> {
3016 ASTContext &Context;
3017 const DeclaratorChunk &Chunk;
3020 DeclaratorLocFiller(ASTContext &Context, const DeclaratorChunk &Chunk)
3021 : Context(Context), Chunk(Chunk) {}
3023 void VisitQualifiedTypeLoc(QualifiedTypeLoc TL) {
3024 llvm_unreachable("qualified type locs not expected here!");
3027 void VisitAttributedTypeLoc(AttributedTypeLoc TL) {
3028 fillAttributedTypeLoc(TL, Chunk.getAttrs());
3030 void VisitBlockPointerTypeLoc(BlockPointerTypeLoc TL) {
3031 assert(Chunk.Kind == DeclaratorChunk::BlockPointer);
3032 TL.setCaretLoc(Chunk.Loc);
3034 void VisitPointerTypeLoc(PointerTypeLoc TL) {
3035 assert(Chunk.Kind == DeclaratorChunk::Pointer);
3036 TL.setStarLoc(Chunk.Loc);
3038 void VisitObjCObjectPointerTypeLoc(ObjCObjectPointerTypeLoc TL) {
3039 assert(Chunk.Kind == DeclaratorChunk::Pointer);
3040 TL.setStarLoc(Chunk.Loc);
3042 void VisitMemberPointerTypeLoc(MemberPointerTypeLoc TL) {
3043 assert(Chunk.Kind == DeclaratorChunk::MemberPointer);
3044 const CXXScopeSpec& SS = Chunk.Mem.Scope();
3045 NestedNameSpecifierLoc NNSLoc = SS.getWithLocInContext(Context);
3047 const Type* ClsTy = TL.getClass();
3048 QualType ClsQT = QualType(ClsTy, 0);
3049 TypeSourceInfo *ClsTInfo = Context.CreateTypeSourceInfo(ClsQT, 0);
3050 // Now copy source location info into the type loc component.
3051 TypeLoc ClsTL = ClsTInfo->getTypeLoc();
3052 switch (NNSLoc.getNestedNameSpecifier()->getKind()) {
3053 case NestedNameSpecifier::Identifier:
3054 assert(isa<DependentNameType>(ClsTy) && "Unexpected TypeLoc");
3056 DependentNameTypeLoc DNTLoc = cast<DependentNameTypeLoc>(ClsTL);
3057 DNTLoc.setElaboratedKeywordLoc(SourceLocation());
3058 DNTLoc.setQualifierLoc(NNSLoc.getPrefix());
3059 DNTLoc.setNameLoc(NNSLoc.getLocalBeginLoc());
3063 case NestedNameSpecifier::TypeSpec:
3064 case NestedNameSpecifier::TypeSpecWithTemplate:
3065 if (isa<ElaboratedType>(ClsTy)) {
3066 ElaboratedTypeLoc ETLoc = *cast<ElaboratedTypeLoc>(&ClsTL);
3067 ETLoc.setElaboratedKeywordLoc(SourceLocation());
3068 ETLoc.setQualifierLoc(NNSLoc.getPrefix());
3069 TypeLoc NamedTL = ETLoc.getNamedTypeLoc();
3070 NamedTL.initializeFullCopy(NNSLoc.getTypeLoc());
3072 ClsTL.initializeFullCopy(NNSLoc.getTypeLoc());
3076 case NestedNameSpecifier::Namespace:
3077 case NestedNameSpecifier::NamespaceAlias:
3078 case NestedNameSpecifier::Global:
3079 llvm_unreachable("Nested-name-specifier must name a type");
3082 // Finally fill in MemberPointerLocInfo fields.
3083 TL.setStarLoc(Chunk.Loc);
3084 TL.setClassTInfo(ClsTInfo);
3086 void VisitLValueReferenceTypeLoc(LValueReferenceTypeLoc TL) {
3087 assert(Chunk.Kind == DeclaratorChunk::Reference);
3088 // 'Amp' is misleading: this might have been originally
3089 /// spelled with AmpAmp.
3090 TL.setAmpLoc(Chunk.Loc);
3092 void VisitRValueReferenceTypeLoc(RValueReferenceTypeLoc TL) {
3093 assert(Chunk.Kind == DeclaratorChunk::Reference);
3094 assert(!Chunk.Ref.LValueRef);
3095 TL.setAmpAmpLoc(Chunk.Loc);
3097 void VisitArrayTypeLoc(ArrayTypeLoc TL) {
3098 assert(Chunk.Kind == DeclaratorChunk::Array);
3099 TL.setLBracketLoc(Chunk.Loc);
3100 TL.setRBracketLoc(Chunk.EndLoc);
3101 TL.setSizeExpr(static_cast<Expr*>(Chunk.Arr.NumElts));
3103 void VisitFunctionTypeLoc(FunctionTypeLoc TL) {
3104 assert(Chunk.Kind == DeclaratorChunk::Function);
3105 TL.setLocalRangeBegin(Chunk.Loc);
3106 TL.setLocalRangeEnd(Chunk.EndLoc);
3107 TL.setTrailingReturn(!!Chunk.Fun.TrailingReturnType);
3109 const DeclaratorChunk::FunctionTypeInfo &FTI = Chunk.Fun;
3110 for (unsigned i = 0, e = TL.getNumArgs(), tpi = 0; i != e; ++i) {
3111 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[i].Param);
3112 TL.setArg(tpi++, Param);
3114 // FIXME: exception specs
3116 void VisitParenTypeLoc(ParenTypeLoc TL) {
3117 assert(Chunk.Kind == DeclaratorChunk::Paren);
3118 TL.setLParenLoc(Chunk.Loc);
3119 TL.setRParenLoc(Chunk.EndLoc);
3122 void VisitTypeLoc(TypeLoc TL) {
3123 llvm_unreachable("unsupported TypeLoc kind in declarator!");
3128 /// \brief Create and instantiate a TypeSourceInfo with type source information.
3130 /// \param T QualType referring to the type as written in source code.
3132 /// \param ReturnTypeInfo For declarators whose return type does not show
3133 /// up in the normal place in the declaration specifiers (such as a C++
3134 /// conversion function), this pointer will refer to a type source information
3135 /// for that return type.
3137 Sema::GetTypeSourceInfoForDeclarator(Declarator &D, QualType T,
3138 TypeSourceInfo *ReturnTypeInfo) {
3139 TypeSourceInfo *TInfo = Context.CreateTypeSourceInfo(T);
3140 UnqualTypeLoc CurrTL = TInfo->getTypeLoc().getUnqualifiedLoc();
3142 // Handle parameter packs whose type is a pack expansion.
3143 if (isa<PackExpansionType>(T)) {
3144 cast<PackExpansionTypeLoc>(CurrTL).setEllipsisLoc(D.getEllipsisLoc());
3145 CurrTL = CurrTL.getNextTypeLoc().getUnqualifiedLoc();
3148 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) {
3149 while (isa<AttributedTypeLoc>(CurrTL)) {
3150 AttributedTypeLoc TL = cast<AttributedTypeLoc>(CurrTL);
3151 fillAttributedTypeLoc(TL, D.getTypeObject(i).getAttrs());
3152 CurrTL = TL.getNextTypeLoc().getUnqualifiedLoc();
3155 DeclaratorLocFiller(Context, D.getTypeObject(i)).Visit(CurrTL);
3156 CurrTL = CurrTL.getNextTypeLoc().getUnqualifiedLoc();
3159 // If we have different source information for the return type, use
3160 // that. This really only applies to C++ conversion functions.
3161 if (ReturnTypeInfo) {
3162 TypeLoc TL = ReturnTypeInfo->getTypeLoc();
3163 assert(TL.getFullDataSize() == CurrTL.getFullDataSize());
3164 memcpy(CurrTL.getOpaqueData(), TL.getOpaqueData(), TL.getFullDataSize());
3166 TypeSpecLocFiller(Context, D.getDeclSpec()).Visit(CurrTL);
3172 /// \brief Create a LocInfoType to hold the given QualType and TypeSourceInfo.
3173 ParsedType Sema::CreateParsedType(QualType T, TypeSourceInfo *TInfo) {
3174 // FIXME: LocInfoTypes are "transient", only needed for passing to/from Parser
3175 // and Sema during declaration parsing. Try deallocating/caching them when
3176 // it's appropriate, instead of allocating them and keeping them around.
3177 LocInfoType *LocT = (LocInfoType*)BumpAlloc.Allocate(sizeof(LocInfoType),
3179 new (LocT) LocInfoType(T, TInfo);
3180 assert(LocT->getTypeClass() != T->getTypeClass() &&
3181 "LocInfoType's TypeClass conflicts with an existing Type class");
3182 return ParsedType::make(QualType(LocT, 0));
3185 void LocInfoType::getAsStringInternal(std::string &Str,
3186 const PrintingPolicy &Policy) const {
3187 llvm_unreachable("LocInfoType leaked into the type system; an opaque TypeTy*"
3188 " was used directly instead of getting the QualType through"
3189 " GetTypeFromParser");
3192 TypeResult Sema::ActOnTypeName(Scope *S, Declarator &D) {
3193 // C99 6.7.6: Type names have no identifier. This is already validated by
3195 assert(D.getIdentifier() == 0 && "Type name should have no identifier!");
3197 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S);
3198 QualType T = TInfo->getType();
3199 if (D.isInvalidType())
3202 // Make sure there are no unused decl attributes on the declarator.
3203 // We don't want to do this for ObjC parameters because we're going
3204 // to apply them to the actual parameter declaration.
3205 if (D.getContext() != Declarator::ObjCParameterContext)
3206 checkUnusedDeclAttributes(D);
3208 if (getLangOpts().CPlusPlus) {
3209 // Check that there are no default arguments (C++ only).
3210 CheckExtraCXXDefaultArguments(D);
3213 return CreateParsedType(T, TInfo);
3216 ParsedType Sema::ActOnObjCInstanceType(SourceLocation Loc) {
3217 QualType T = Context.getObjCInstanceType();
3218 TypeSourceInfo *TInfo = Context.getTrivialTypeSourceInfo(T, Loc);
3219 return CreateParsedType(T, TInfo);
3223 //===----------------------------------------------------------------------===//
3224 // Type Attribute Processing
3225 //===----------------------------------------------------------------------===//
3227 /// HandleAddressSpaceTypeAttribute - Process an address_space attribute on the
3228 /// specified type. The attribute contains 1 argument, the id of the address
3229 /// space for the type.
3230 static void HandleAddressSpaceTypeAttribute(QualType &Type,
3231 const AttributeList &Attr, Sema &S){
3233 // If this type is already address space qualified, reject it.
3234 // ISO/IEC TR 18037 S5.3 (amending C99 6.7.3): "No type shall be qualified by
3235 // qualifiers for two or more different address spaces."
3236 if (Type.getAddressSpace()) {
3237 S.Diag(Attr.getLoc(), diag::err_attribute_address_multiple_qualifiers);
3242 // ISO/IEC TR 18037 S5.3 (amending C99 6.7.3): "A function type shall not be
3243 // qualified by an address-space qualifier."
3244 if (Type->isFunctionType()) {
3245 S.Diag(Attr.getLoc(), diag::err_attribute_address_function_type);
3250 // Check the attribute arguments.
3251 if (Attr.getNumArgs() != 1) {
3252 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1;
3256 Expr *ASArgExpr = static_cast<Expr *>(Attr.getArg(0));
3257 llvm::APSInt addrSpace(32);
3258 if (ASArgExpr->isTypeDependent() || ASArgExpr->isValueDependent() ||
3259 !ASArgExpr->isIntegerConstantExpr(addrSpace, S.Context)) {
3260 S.Diag(Attr.getLoc(), diag::err_attribute_address_space_not_int)
3261 << ASArgExpr->getSourceRange();
3267 if (addrSpace.isSigned()) {
3268 if (addrSpace.isNegative()) {
3269 S.Diag(Attr.getLoc(), diag::err_attribute_address_space_negative)
3270 << ASArgExpr->getSourceRange();
3274 addrSpace.setIsSigned(false);
3276 llvm::APSInt max(addrSpace.getBitWidth());
3277 max = Qualifiers::MaxAddressSpace;
3278 if (addrSpace > max) {
3279 S.Diag(Attr.getLoc(), diag::err_attribute_address_space_too_high)
3280 << Qualifiers::MaxAddressSpace << ASArgExpr->getSourceRange();
3285 unsigned ASIdx = static_cast<unsigned>(addrSpace.getZExtValue());
3286 Type = S.Context.getAddrSpaceQualType(Type, ASIdx);
3289 /// Does this type have a "direct" ownership qualifier? That is,
3290 /// is it written like "__strong id", as opposed to something like
3291 /// "typeof(foo)", where that happens to be strong?
3292 static bool hasDirectOwnershipQualifier(QualType type) {
3293 // Fast path: no qualifier at all.
3294 assert(type.getQualifiers().hasObjCLifetime());
3298 if (const AttributedType *attr = dyn_cast<AttributedType>(type)) {
3299 if (attr->getAttrKind() == AttributedType::attr_objc_ownership)
3302 type = attr->getModifiedType();
3304 // X *__strong (...)
3305 } else if (const ParenType *paren = dyn_cast<ParenType>(type)) {
3306 type = paren->getInnerType();
3308 // That's it for things we want to complain about. In particular,
3309 // we do not want to look through typedefs, typeof(expr),
3310 // typeof(type), or any other way that the type is somehow
3319 /// handleObjCOwnershipTypeAttr - Process an objc_ownership
3320 /// attribute on the specified type.
3322 /// Returns 'true' if the attribute was handled.
3323 static bool handleObjCOwnershipTypeAttr(TypeProcessingState &state,
3324 AttributeList &attr,
3326 bool NonObjCPointer = false;
3328 if (!type->isDependentType()) {
3329 if (const PointerType *ptr = type->getAs<PointerType>()) {
3330 QualType pointee = ptr->getPointeeType();
3331 if (pointee->isObjCRetainableType() || pointee->isPointerType())
3333 // It is important not to lose the source info that there was an attribute
3334 // applied to non-objc pointer. We will create an attributed type but
3335 // its type will be the same as the original type.
3336 NonObjCPointer = true;
3337 } else if (!type->isObjCRetainableType()) {
3342 Sema &S = state.getSema();
3343 SourceLocation AttrLoc = attr.getLoc();
3344 if (AttrLoc.isMacroID())
3345 AttrLoc = S.getSourceManager().getImmediateExpansionRange(AttrLoc).first;
3347 if (!attr.getParameterName()) {
3348 S.Diag(AttrLoc, diag::err_attribute_argument_n_not_string)
3349 << "objc_ownership" << 1;
3354 // Consume lifetime attributes without further comment outside of
3356 if (!S.getLangOpts().ObjCAutoRefCount)
3359 Qualifiers::ObjCLifetime lifetime;
3360 if (attr.getParameterName()->isStr("none"))
3361 lifetime = Qualifiers::OCL_ExplicitNone;
3362 else if (attr.getParameterName()->isStr("strong"))
3363 lifetime = Qualifiers::OCL_Strong;
3364 else if (attr.getParameterName()->isStr("weak"))
3365 lifetime = Qualifiers::OCL_Weak;
3366 else if (attr.getParameterName()->isStr("autoreleasing"))
3367 lifetime = Qualifiers::OCL_Autoreleasing;
3369 S.Diag(AttrLoc, diag::warn_attribute_type_not_supported)
3370 << "objc_ownership" << attr.getParameterName();
3375 SplitQualType underlyingType = type.split();
3377 // Check for redundant/conflicting ownership qualifiers.
3378 if (Qualifiers::ObjCLifetime previousLifetime
3379 = type.getQualifiers().getObjCLifetime()) {
3380 // If it's written directly, that's an error.
3381 if (hasDirectOwnershipQualifier(type)) {
3382 S.Diag(AttrLoc, diag::err_attr_objc_ownership_redundant)
3387 // Otherwise, if the qualifiers actually conflict, pull sugar off
3388 // until we reach a type that is directly qualified.
3389 if (previousLifetime != lifetime) {
3390 // This should always terminate: the canonical type is
3391 // qualified, so some bit of sugar must be hiding it.
3392 while (!underlyingType.Quals.hasObjCLifetime()) {
3393 underlyingType = underlyingType.getSingleStepDesugaredType();
3395 underlyingType.Quals.removeObjCLifetime();
3399 underlyingType.Quals.addObjCLifetime(lifetime);
3401 if (NonObjCPointer) {
3402 StringRef name = attr.getName()->getName();
3404 case Qualifiers::OCL_None:
3405 case Qualifiers::OCL_ExplicitNone:
3407 case Qualifiers::OCL_Strong: name = "__strong"; break;
3408 case Qualifiers::OCL_Weak: name = "__weak"; break;
3409 case Qualifiers::OCL_Autoreleasing: name = "__autoreleasing"; break;
3411 S.Diag(AttrLoc, diag::warn_objc_object_attribute_wrong_type)
3415 QualType origType = type;
3416 if (!NonObjCPointer)
3417 type = S.Context.getQualifiedType(underlyingType);
3419 // If we have a valid source location for the attribute, use an
3420 // AttributedType instead.
3421 if (AttrLoc.isValid())
3422 type = S.Context.getAttributedType(AttributedType::attr_objc_ownership,
3425 // Forbid __weak if the runtime doesn't support it.
3426 if (lifetime == Qualifiers::OCL_Weak &&
3427 !S.getLangOpts().ObjCRuntimeHasWeak && !NonObjCPointer) {
3429 // Actually, delay this until we know what we're parsing.
3430 if (S.DelayedDiagnostics.shouldDelayDiagnostics()) {
3431 S.DelayedDiagnostics.add(
3432 sema::DelayedDiagnostic::makeForbiddenType(
3433 S.getSourceManager().getExpansionLoc(AttrLoc),
3434 diag::err_arc_weak_no_runtime, type, /*ignored*/ 0));
3436 S.Diag(AttrLoc, diag::err_arc_weak_no_runtime);
3443 // Forbid __weak for class objects marked as
3444 // objc_arc_weak_reference_unavailable
3445 if (lifetime == Qualifiers::OCL_Weak) {
3447 while (const PointerType *ptr = T->getAs<PointerType>())
3448 T = ptr->getPointeeType();
3449 if (const ObjCObjectPointerType *ObjT = T->getAs<ObjCObjectPointerType>()) {
3450 ObjCInterfaceDecl *Class = ObjT->getInterfaceDecl();
3451 if (Class->isArcWeakrefUnavailable()) {
3452 S.Diag(AttrLoc, diag::err_arc_unsupported_weak_class);
3453 S.Diag(ObjT->getInterfaceDecl()->getLocation(),
3454 diag::note_class_declared);
3462 /// handleObjCGCTypeAttr - Process the __attribute__((objc_gc)) type
3463 /// attribute on the specified type. Returns true to indicate that
3464 /// the attribute was handled, false to indicate that the type does
3465 /// not permit the attribute.
3466 static bool handleObjCGCTypeAttr(TypeProcessingState &state,
3467 AttributeList &attr,
3469 Sema &S = state.getSema();
3471 // Delay if this isn't some kind of pointer.
3472 if (!type->isPointerType() &&
3473 !type->isObjCObjectPointerType() &&
3474 !type->isBlockPointerType())
3477 if (type.getObjCGCAttr() != Qualifiers::GCNone) {
3478 S.Diag(attr.getLoc(), diag::err_attribute_multiple_objc_gc);
3483 // Check the attribute arguments.
3484 if (!attr.getParameterName()) {
3485 S.Diag(attr.getLoc(), diag::err_attribute_argument_n_not_string)
3490 Qualifiers::GC GCAttr;
3491 if (attr.getNumArgs() != 0) {
3492 S.Diag(attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1;
3496 if (attr.getParameterName()->isStr("weak"))
3497 GCAttr = Qualifiers::Weak;
3498 else if (attr.getParameterName()->isStr("strong"))
3499 GCAttr = Qualifiers::Strong;
3501 S.Diag(attr.getLoc(), diag::warn_attribute_type_not_supported)
3502 << "objc_gc" << attr.getParameterName();
3507 QualType origType = type;
3508 type = S.Context.getObjCGCQualType(origType, GCAttr);
3510 // Make an attributed type to preserve the source information.
3511 if (attr.getLoc().isValid())
3512 type = S.Context.getAttributedType(AttributedType::attr_objc_gc,
3519 /// A helper class to unwrap a type down to a function for the
3520 /// purposes of applying attributes there.
3523 /// FunctionTypeUnwrapper unwrapped(SemaRef, T);
3524 /// if (unwrapped.isFunctionType()) {
3525 /// const FunctionType *fn = unwrapped.get();
3526 /// // change fn somehow
3527 /// T = unwrapped.wrap(fn);
3529 struct FunctionTypeUnwrapper {
3540 const FunctionType *Fn;
3541 SmallVector<unsigned char /*WrapKind*/, 8> Stack;
3543 FunctionTypeUnwrapper(Sema &S, QualType T) : Original(T) {
3545 const Type *Ty = T.getTypePtr();
3546 if (isa<FunctionType>(Ty)) {
3547 Fn = cast<FunctionType>(Ty);
3549 } else if (isa<ParenType>(Ty)) {
3550 T = cast<ParenType>(Ty)->getInnerType();
3551 Stack.push_back(Parens);
3552 } else if (isa<PointerType>(Ty)) {
3553 T = cast<PointerType>(Ty)->getPointeeType();
3554 Stack.push_back(Pointer);
3555 } else if (isa<BlockPointerType>(Ty)) {
3556 T = cast<BlockPointerType>(Ty)->getPointeeType();
3557 Stack.push_back(BlockPointer);
3558 } else if (isa<MemberPointerType>(Ty)) {
3559 T = cast<MemberPointerType>(Ty)->getPointeeType();
3560 Stack.push_back(MemberPointer);
3561 } else if (isa<ReferenceType>(Ty)) {
3562 T = cast<ReferenceType>(Ty)->getPointeeType();
3563 Stack.push_back(Reference);
3565 const Type *DTy = Ty->getUnqualifiedDesugaredType();
3571 T = QualType(DTy, 0);
3572 Stack.push_back(Desugar);
3577 bool isFunctionType() const { return (Fn != 0); }
3578 const FunctionType *get() const { return Fn; }
3580 QualType wrap(Sema &S, const FunctionType *New) {
3581 // If T wasn't modified from the unwrapped type, do nothing.
3582 if (New == get()) return Original;
3585 return wrap(S.Context, Original, 0);
3589 QualType wrap(ASTContext &C, QualType Old, unsigned I) {
3590 if (I == Stack.size())
3591 return C.getQualifiedType(Fn, Old.getQualifiers());
3593 // Build up the inner type, applying the qualifiers from the old
3594 // type to the new type.
3595 SplitQualType SplitOld = Old.split();
3597 // As a special case, tail-recurse if there are no qualifiers.
3598 if (SplitOld.Quals.empty())
3599 return wrap(C, SplitOld.Ty, I);
3600 return C.getQualifiedType(wrap(C, SplitOld.Ty, I), SplitOld.Quals);
3603 QualType wrap(ASTContext &C, const Type *Old, unsigned I) {
3604 if (I == Stack.size()) return QualType(Fn, 0);
3606 switch (static_cast<WrapKind>(Stack[I++])) {
3608 // This is the point at which we potentially lose source
3610 return wrap(C, Old->getUnqualifiedDesugaredType(), I);
3613 QualType New = wrap(C, cast<ParenType>(Old)->getInnerType(), I);
3614 return C.getParenType(New);
3618 QualType New = wrap(C, cast<PointerType>(Old)->getPointeeType(), I);
3619 return C.getPointerType(New);
3622 case BlockPointer: {
3623 QualType New = wrap(C, cast<BlockPointerType>(Old)->getPointeeType(),I);
3624 return C.getBlockPointerType(New);
3627 case MemberPointer: {
3628 const MemberPointerType *OldMPT = cast<MemberPointerType>(Old);
3629 QualType New = wrap(C, OldMPT->getPointeeType(), I);
3630 return C.getMemberPointerType(New, OldMPT->getClass());
3634 const ReferenceType *OldRef = cast<ReferenceType>(Old);
3635 QualType New = wrap(C, OldRef->getPointeeType(), I);
3636 if (isa<LValueReferenceType>(OldRef))
3637 return C.getLValueReferenceType(New, OldRef->isSpelledAsLValue());
3639 return C.getRValueReferenceType(New);
3643 llvm_unreachable("unknown wrapping kind");
3648 /// Process an individual function attribute. Returns true to
3649 /// indicate that the attribute was handled, false if it wasn't.
3650 static bool handleFunctionTypeAttr(TypeProcessingState &state,
3651 AttributeList &attr,
3653 Sema &S = state.getSema();
3655 FunctionTypeUnwrapper unwrapped(S, type);
3657 if (attr.getKind() == AttributeList::AT_noreturn) {
3658 if (S.CheckNoReturnAttr(attr))
3661 // Delay if this is not a function type.
3662 if (!unwrapped.isFunctionType())
3665 // Otherwise we can process right away.
3666 FunctionType::ExtInfo EI = unwrapped.get()->getExtInfo().withNoReturn(true);
3667 type = unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI));
3671 // ns_returns_retained is not always a type attribute, but if we got
3672 // here, we're treating it as one right now.
3673 if (attr.getKind() == AttributeList::AT_ns_returns_retained) {
3674 assert(S.getLangOpts().ObjCAutoRefCount &&
3675 "ns_returns_retained treated as type attribute in non-ARC");
3676 if (attr.getNumArgs()) return true;
3678 // Delay if this is not a function type.
3679 if (!unwrapped.isFunctionType())
3682 FunctionType::ExtInfo EI
3683 = unwrapped.get()->getExtInfo().withProducesResult(true);
3684 type = unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI));
3688 if (attr.getKind() == AttributeList::AT_regparm) {
3690 if (S.CheckRegparmAttr(attr, value))
3693 // Delay if this is not a function type.
3694 if (!unwrapped.isFunctionType())
3697 // Diagnose regparm with fastcall.
3698 const FunctionType *fn = unwrapped.get();
3699 CallingConv CC = fn->getCallConv();
3700 if (CC == CC_X86FastCall) {
3701 S.Diag(attr.getLoc(), diag::err_attributes_are_not_compatible)
3702 << FunctionType::getNameForCallConv(CC)
3708 FunctionType::ExtInfo EI =
3709 unwrapped.get()->getExtInfo().withRegParm(value);
3710 type = unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI));
3714 // Otherwise, a calling convention.
3716 if (S.CheckCallingConvAttr(attr, CC))
3719 // Delay if the type didn't work out to a function.
3720 if (!unwrapped.isFunctionType()) return false;
3722 const FunctionType *fn = unwrapped.get();
3723 CallingConv CCOld = fn->getCallConv();
3724 if (S.Context.getCanonicalCallConv(CC) ==
3725 S.Context.getCanonicalCallConv(CCOld)) {
3726 FunctionType::ExtInfo EI= unwrapped.get()->getExtInfo().withCallingConv(CC);
3727 type = unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI));
3731 if (CCOld != (S.LangOpts.MRTD ? CC_X86StdCall : CC_Default)) {
3732 // Should we diagnose reapplications of the same convention?
3733 S.Diag(attr.getLoc(), diag::err_attributes_are_not_compatible)
3734 << FunctionType::getNameForCallConv(CC)
3735 << FunctionType::getNameForCallConv(CCOld);
3740 // Diagnose the use of X86 fastcall on varargs or unprototyped functions.
3741 if (CC == CC_X86FastCall) {
3742 if (isa<FunctionNoProtoType>(fn)) {
3743 S.Diag(attr.getLoc(), diag::err_cconv_knr)
3744 << FunctionType::getNameForCallConv(CC);
3749 const FunctionProtoType *FnP = cast<FunctionProtoType>(fn);
3750 if (FnP->isVariadic()) {
3751 S.Diag(attr.getLoc(), diag::err_cconv_varargs)
3752 << FunctionType::getNameForCallConv(CC);
3757 // Also diagnose fastcall with regparm.
3758 if (fn->getHasRegParm()) {
3759 S.Diag(attr.getLoc(), diag::err_attributes_are_not_compatible)
3761 << FunctionType::getNameForCallConv(CC);
3767 FunctionType::ExtInfo EI = unwrapped.get()->getExtInfo().withCallingConv(CC);
3768 type = unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI));
3772 /// Handle OpenCL image access qualifiers: read_only, write_only, read_write
3773 static void HandleOpenCLImageAccessAttribute(QualType& CurType,
3774 const AttributeList &Attr,
3776 // Check the attribute arguments.
3777 if (Attr.getNumArgs() != 1) {
3778 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1;
3782 Expr *sizeExpr = static_cast<Expr *>(Attr.getArg(0));
3783 llvm::APSInt arg(32);
3784 if (sizeExpr->isTypeDependent() || sizeExpr->isValueDependent() ||
3785 !sizeExpr->isIntegerConstantExpr(arg, S.Context)) {
3786 S.Diag(Attr.getLoc(), diag::err_attribute_argument_not_int)
3787 << "opencl_image_access" << sizeExpr->getSourceRange();
3791 unsigned iarg = static_cast<unsigned>(arg.getZExtValue());
3793 case CLIA_read_only:
3794 case CLIA_write_only:
3795 case CLIA_read_write:
3796 // Implemented in a separate patch
3799 // Implemented in a separate patch
3800 S.Diag(Attr.getLoc(), diag::err_attribute_invalid_size)
3801 << sizeExpr->getSourceRange();
3807 /// HandleVectorSizeAttribute - this attribute is only applicable to integral
3808 /// and float scalars, although arrays, pointers, and function return values are
3809 /// allowed in conjunction with this construct. Aggregates with this attribute
3810 /// are invalid, even if they are of the same size as a corresponding scalar.
3811 /// The raw attribute should contain precisely 1 argument, the vector size for
3812 /// the variable, measured in bytes. If curType and rawAttr are well formed,
3813 /// this routine will return a new vector type.
3814 static void HandleVectorSizeAttr(QualType& CurType, const AttributeList &Attr,
3816 // Check the attribute arguments.
3817 if (Attr.getNumArgs() != 1) {
3818 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1;
3822 Expr *sizeExpr = static_cast<Expr *>(Attr.getArg(0));
3823 llvm::APSInt vecSize(32);
3824 if (sizeExpr->isTypeDependent() || sizeExpr->isValueDependent() ||
3825 !sizeExpr->isIntegerConstantExpr(vecSize, S.Context)) {
3826 S.Diag(Attr.getLoc(), diag::err_attribute_argument_not_int)
3827 << "vector_size" << sizeExpr->getSourceRange();
3831 // the base type must be integer or float, and can't already be a vector.
3832 if (!CurType->isIntegerType() && !CurType->isRealFloatingType()) {
3833 S.Diag(Attr.getLoc(), diag::err_attribute_invalid_vector_type) << CurType;
3837 unsigned typeSize = static_cast<unsigned>(S.Context.getTypeSize(CurType));
3838 // vecSize is specified in bytes - convert to bits.
3839 unsigned vectorSize = static_cast<unsigned>(vecSize.getZExtValue() * 8);
3841 // the vector size needs to be an integral multiple of the type size.
3842 if (vectorSize % typeSize) {
3843 S.Diag(Attr.getLoc(), diag::err_attribute_invalid_size)
3844 << sizeExpr->getSourceRange();
3848 if (vectorSize == 0) {
3849 S.Diag(Attr.getLoc(), diag::err_attribute_zero_size)
3850 << sizeExpr->getSourceRange();
3855 // Success! Instantiate the vector type, the number of elements is > 0, and
3856 // not required to be a power of 2, unlike GCC.
3857 CurType = S.Context.getVectorType(CurType, vectorSize/typeSize,
3858 VectorType::GenericVector);
3861 /// \brief Process the OpenCL-like ext_vector_type attribute when it occurs on
3863 static void HandleExtVectorTypeAttr(QualType &CurType,
3864 const AttributeList &Attr,
3868 // Special case where the argument is a template id.
3869 if (Attr.getParameterName()) {
3871 SourceLocation TemplateKWLoc;
3873 id.setIdentifier(Attr.getParameterName(), Attr.getLoc());
3875 ExprResult Size = S.ActOnIdExpression(S.getCurScope(), SS, TemplateKWLoc,
3877 if (Size.isInvalid())
3880 sizeExpr = Size.get();
3882 // check the attribute arguments.
3883 if (Attr.getNumArgs() != 1) {
3884 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1;
3887 sizeExpr = Attr.getArg(0);
3890 // Create the vector type.
3891 QualType T = S.BuildExtVectorType(CurType, sizeExpr, Attr.getLoc());
3896 /// HandleNeonVectorTypeAttr - The "neon_vector_type" and
3897 /// "neon_polyvector_type" attributes are used to create vector types that
3898 /// are mangled according to ARM's ABI. Otherwise, these types are identical
3899 /// to those created with the "vector_size" attribute. Unlike "vector_size"
3900 /// the argument to these Neon attributes is the number of vector elements,
3901 /// not the vector size in bytes. The vector width and element type must
3902 /// match one of the standard Neon vector types.
3903 static void HandleNeonVectorTypeAttr(QualType& CurType,
3904 const AttributeList &Attr, Sema &S,
3905 VectorType::VectorKind VecKind,
3906 const char *AttrName) {
3907 // Check the attribute arguments.
3908 if (Attr.getNumArgs() != 1) {
3909 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1;
3913 // The number of elements must be an ICE.
3914 Expr *numEltsExpr = static_cast<Expr *>(Attr.getArg(0));
3915 llvm::APSInt numEltsInt(32);
3916 if (numEltsExpr->isTypeDependent() || numEltsExpr->isValueDependent() ||
3917 !numEltsExpr->isIntegerConstantExpr(numEltsInt, S.Context)) {
3918 S.Diag(Attr.getLoc(), diag::err_attribute_argument_not_int)
3919 << AttrName << numEltsExpr->getSourceRange();
3923 // Only certain element types are supported for Neon vectors.
3924 const BuiltinType* BTy = CurType->getAs<BuiltinType>();
3926 (VecKind == VectorType::NeonPolyVector &&
3927 BTy->getKind() != BuiltinType::SChar &&
3928 BTy->getKind() != BuiltinType::Short) ||
3929 (BTy->getKind() != BuiltinType::SChar &&
3930 BTy->getKind() != BuiltinType::UChar &&
3931 BTy->getKind() != BuiltinType::Short &&
3932 BTy->getKind() != BuiltinType::UShort &&
3933 BTy->getKind() != BuiltinType::Int &&
3934 BTy->getKind() != BuiltinType::UInt &&
3935 BTy->getKind() != BuiltinType::LongLong &&
3936 BTy->getKind() != BuiltinType::ULongLong &&
3937 BTy->getKind() != BuiltinType::Float)) {
3938 S.Diag(Attr.getLoc(), diag::err_attribute_invalid_vector_type) <<CurType;
3942 // The total size of the vector must be 64 or 128 bits.
3943 unsigned typeSize = static_cast<unsigned>(S.Context.getTypeSize(CurType));
3944 unsigned numElts = static_cast<unsigned>(numEltsInt.getZExtValue());
3945 unsigned vecSize = typeSize * numElts;
3946 if (vecSize != 64 && vecSize != 128) {
3947 S.Diag(Attr.getLoc(), diag::err_attribute_bad_neon_vector_size) << CurType;
3952 CurType = S.Context.getVectorType(CurType, numElts, VecKind);
3955 static void processTypeAttrs(TypeProcessingState &state, QualType &type,
3956 bool isDeclSpec, AttributeList *attrs) {
3957 // Scan through and apply attributes to this type where it makes sense. Some
3958 // attributes (such as __address_space__, __vector_size__, etc) apply to the
3959 // type, but others can be present in the type specifiers even though they
3960 // apply to the decl. Here we apply type attributes and ignore the rest.
3962 AttributeList *next;
3964 AttributeList &attr = *attrs;
3965 next = attr.getNext();
3967 // Skip attributes that were marked to be invalid.
3968 if (attr.isInvalid())
3971 // If this is an attribute we can handle, do so now,
3972 // otherwise, add it to the FnAttrs list for rechaining.
3973 switch (attr.getKind()) {
3976 case AttributeList::AT_may_alias:
3977 // FIXME: This attribute needs to actually be handled, but if we ignore
3978 // it it breaks large amounts of Linux software.
3979 attr.setUsedAsTypeAttr();
3981 case AttributeList::AT_address_space:
3982 HandleAddressSpaceTypeAttribute(type, attr, state.getSema());
3983 attr.setUsedAsTypeAttr();
3985 OBJC_POINTER_TYPE_ATTRS_CASELIST:
3986 if (!handleObjCPointerTypeAttr(state, attr, type))
3987 distributeObjCPointerTypeAttr(state, attr, type);
3988 attr.setUsedAsTypeAttr();
3990 case AttributeList::AT_vector_size:
3991 HandleVectorSizeAttr(type, attr, state.getSema());
3992 attr.setUsedAsTypeAttr();
3994 case AttributeList::AT_ext_vector_type:
3995 if (state.getDeclarator().getDeclSpec().getStorageClassSpec()
3996 != DeclSpec::SCS_typedef)
3997 HandleExtVectorTypeAttr(type, attr, state.getSema());
3998 attr.setUsedAsTypeAttr();
4000 case AttributeList::AT_neon_vector_type:
4001 HandleNeonVectorTypeAttr(type, attr, state.getSema(),
4002 VectorType::NeonVector, "neon_vector_type");
4003 attr.setUsedAsTypeAttr();
4005 case AttributeList::AT_neon_polyvector_type:
4006 HandleNeonVectorTypeAttr(type, attr, state.getSema(),
4007 VectorType::NeonPolyVector,
4008 "neon_polyvector_type");
4009 attr.setUsedAsTypeAttr();
4011 case AttributeList::AT_opencl_image_access:
4012 HandleOpenCLImageAccessAttribute(type, attr, state.getSema());
4013 attr.setUsedAsTypeAttr();
4016 case AttributeList::AT_ns_returns_retained:
4017 if (!state.getSema().getLangOpts().ObjCAutoRefCount)
4019 // fallthrough into the function attrs
4021 FUNCTION_TYPE_ATTRS_CASELIST:
4022 attr.setUsedAsTypeAttr();
4024 // Never process function type attributes as part of the
4025 // declaration-specifiers.
4027 distributeFunctionTypeAttrFromDeclSpec(state, attr, type);
4029 // Otherwise, handle the possible delays.
4030 else if (!handleFunctionTypeAttr(state, attr, type))
4031 distributeFunctionTypeAttr(state, attr, type);
4034 } while ((attrs = next));
4037 /// \brief Ensure that the type of the given expression is complete.
4039 /// This routine checks whether the expression \p E has a complete type. If the
4040 /// expression refers to an instantiable construct, that instantiation is
4041 /// performed as needed to complete its type. Furthermore
4042 /// Sema::RequireCompleteType is called for the expression's type (or in the
4043 /// case of a reference type, the referred-to type).
4045 /// \param E The expression whose type is required to be complete.
4046 /// \param PD The partial diagnostic that will be printed out if the type cannot
4049 /// \returns \c true if the type of \p E is incomplete and diagnosed, \c false
4051 bool Sema::RequireCompleteExprType(Expr *E, const PartialDiagnostic &PD,
4052 std::pair<SourceLocation,
4053 PartialDiagnostic> Note) {
4054 QualType T = E->getType();
4056 // Fast path the case where the type is already complete.
4057 if (!T->isIncompleteType())
4060 // Incomplete array types may be completed by the initializer attached to
4061 // their definitions. For static data members of class templates we need to
4062 // instantiate the definition to get this initializer and complete the type.
4063 if (T->isIncompleteArrayType()) {
4064 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E->IgnoreParens())) {
4065 if (VarDecl *Var = dyn_cast<VarDecl>(DRE->getDecl())) {
4066 if (Var->isStaticDataMember() &&
4067 Var->getInstantiatedFromStaticDataMember()) {
4069 MemberSpecializationInfo *MSInfo = Var->getMemberSpecializationInfo();
4070 assert(MSInfo && "Missing member specialization information?");
4071 if (MSInfo->getTemplateSpecializationKind()
4072 != TSK_ExplicitSpecialization) {
4073 // If we don't already have a point of instantiation, this is it.
4074 if (MSInfo->getPointOfInstantiation().isInvalid()) {
4075 MSInfo->setPointOfInstantiation(E->getLocStart());
4077 // This is a modification of an existing AST node. Notify
4079 if (ASTMutationListener *L = getASTMutationListener())
4080 L->StaticDataMemberInstantiated(Var);
4083 InstantiateStaticDataMemberDefinition(E->getExprLoc(), Var);
4085 // Update the type to the newly instantiated definition's type both
4086 // here and within the expression.
4087 if (VarDecl *Def = Var->getDefinition()) {
4095 // We still go on to try to complete the type independently, as it
4096 // may also require instantiations or diagnostics if it remains
4103 // FIXME: Are there other cases which require instantiating something other
4104 // than the type to complete the type of an expression?
4106 // Look through reference types and complete the referred type.
4107 if (const ReferenceType *Ref = T->getAs<ReferenceType>())
4108 T = Ref->getPointeeType();
4110 return RequireCompleteType(E->getExprLoc(), T, PD, Note);
4113 /// @brief Ensure that the type T is a complete type.
4115 /// This routine checks whether the type @p T is complete in any
4116 /// context where a complete type is required. If @p T is a complete
4117 /// type, returns false. If @p T is a class template specialization,
4118 /// this routine then attempts to perform class template
4119 /// instantiation. If instantiation fails, or if @p T is incomplete
4120 /// and cannot be completed, issues the diagnostic @p diag (giving it
4121 /// the type @p T) and returns true.
4123 /// @param Loc The location in the source that the incomplete type
4124 /// diagnostic should refer to.
4126 /// @param T The type that this routine is examining for completeness.
4128 /// @param PD The partial diagnostic that will be printed out if T is not a
4131 /// @returns @c true if @p T is incomplete and a diagnostic was emitted,
4132 /// @c false otherwise.
4133 bool Sema::RequireCompleteType(SourceLocation Loc, QualType T,
4134 const PartialDiagnostic &PD,
4135 std::pair<SourceLocation,
4136 PartialDiagnostic> Note) {
4137 unsigned diag = PD.getDiagID();
4139 // FIXME: Add this assertion to make sure we always get instantiation points.
4140 // assert(!Loc.isInvalid() && "Invalid location in RequireCompleteType");
4141 // FIXME: Add this assertion to help us flush out problems with
4142 // checking for dependent types and type-dependent expressions.
4144 // assert(!T->isDependentType() &&
4145 // "Can't ask whether a dependent type is complete");
4147 // If we have a complete type, we're done.
4149 if (!T->isIncompleteType(&Def)) {
4150 // If we know about the definition but it is not visible, complain.
4151 if (diag != 0 && Def && !LookupResult::isVisible(Def)) {
4152 // Suppress this error outside of a SFINAE context if we've already
4153 // emitted the error once for this type. There's no usefulness in
4154 // repeating the diagnostic.
4155 // FIXME: Add a Fix-It that imports the corresponding module or includes
4157 if (isSFINAEContext() || HiddenDefinitions.insert(Def)) {
4158 Diag(Loc, diag::err_module_private_definition) << T;
4159 Diag(Def->getLocation(), diag::note_previous_definition);
4166 const TagType *Tag = T->getAs<TagType>();
4167 const ObjCInterfaceType *IFace = 0;
4170 // Avoid diagnosing invalid decls as incomplete.
4171 if (Tag->getDecl()->isInvalidDecl())
4174 // Give the external AST source a chance to complete the type.
4175 if (Tag->getDecl()->hasExternalLexicalStorage()) {
4176 Context.getExternalSource()->CompleteType(Tag->getDecl());
4177 if (!Tag->isIncompleteType())
4181 else if ((IFace = T->getAs<ObjCInterfaceType>())) {
4182 // Avoid diagnosing invalid decls as incomplete.
4183 if (IFace->getDecl()->isInvalidDecl())
4186 // Give the external AST source a chance to complete the type.
4187 if (IFace->getDecl()->hasExternalLexicalStorage()) {
4188 Context.getExternalSource()->CompleteType(IFace->getDecl());
4189 if (!IFace->isIncompleteType())
4194 // If we have a class template specialization or a class member of a
4195 // class template specialization, or an array with known size of such,
4196 // try to instantiate it.
4197 QualType MaybeTemplate = T;
4198 while (const ConstantArrayType *Array
4199 = Context.getAsConstantArrayType(MaybeTemplate))
4200 MaybeTemplate = Array->getElementType();
4201 if (const RecordType *Record = MaybeTemplate->getAs<RecordType>()) {
4202 if (ClassTemplateSpecializationDecl *ClassTemplateSpec
4203 = dyn_cast<ClassTemplateSpecializationDecl>(Record->getDecl())) {
4204 if (ClassTemplateSpec->getSpecializationKind() == TSK_Undeclared)
4205 return InstantiateClassTemplateSpecialization(Loc, ClassTemplateSpec,
4206 TSK_ImplicitInstantiation,
4207 /*Complain=*/diag != 0);
4208 } else if (CXXRecordDecl *Rec
4209 = dyn_cast<CXXRecordDecl>(Record->getDecl())) {
4210 CXXRecordDecl *Pattern = Rec->getInstantiatedFromMemberClass();
4211 if (!Rec->isBeingDefined() && Pattern) {
4212 MemberSpecializationInfo *MSI = Rec->getMemberSpecializationInfo();
4213 assert(MSI && "Missing member specialization information?");
4214 // This record was instantiated from a class within a template.
4215 if (MSI->getTemplateSpecializationKind() != TSK_ExplicitSpecialization)
4216 return InstantiateClass(Loc, Rec, Pattern,
4217 getTemplateInstantiationArgs(Rec),
4218 TSK_ImplicitInstantiation,
4219 /*Complain=*/diag != 0);
4227 // We have an incomplete type. Produce a diagnostic.
4230 // If we have a note, produce it.
4231 if (!Note.first.isInvalid())
4232 Diag(Note.first, Note.second);
4234 // If the type was a forward declaration of a class/struct/union
4235 // type, produce a note.
4236 if (Tag && !Tag->getDecl()->isInvalidDecl())
4237 Diag(Tag->getDecl()->getLocation(),
4238 Tag->isBeingDefined() ? diag::note_type_being_defined
4239 : diag::note_forward_declaration)
4240 << QualType(Tag, 0);
4242 // If the Objective-C class was a forward declaration, produce a note.
4243 if (IFace && !IFace->getDecl()->isInvalidDecl())
4244 Diag(IFace->getDecl()->getLocation(), diag::note_forward_class);
4249 bool Sema::RequireCompleteType(SourceLocation Loc, QualType T,
4250 const PartialDiagnostic &PD) {
4251 return RequireCompleteType(Loc, T, PD,
4252 std::make_pair(SourceLocation(), PDiag(0)));
4255 bool Sema::RequireCompleteType(SourceLocation Loc, QualType T,
4257 return RequireCompleteType(Loc, T, PDiag(DiagID),
4258 std::make_pair(SourceLocation(), PDiag(0)));
4261 /// @brief Ensure that the type T is a literal type.
4263 /// This routine checks whether the type @p T is a literal type. If @p T is an
4264 /// incomplete type, an attempt is made to complete it. If @p T is a literal
4265 /// type, or @p AllowIncompleteType is true and @p T is an incomplete type,
4266 /// returns false. Otherwise, this routine issues the diagnostic @p PD (giving
4267 /// it the type @p T), along with notes explaining why the type is not a
4268 /// literal type, and returns true.
4270 /// @param Loc The location in the source that the non-literal type
4271 /// diagnostic should refer to.
4273 /// @param T The type that this routine is examining for literalness.
4275 /// @param PD The partial diagnostic that will be printed out if T is not a
4278 /// @returns @c true if @p T is not a literal type and a diagnostic was emitted,
4279 /// @c false otherwise.
4280 bool Sema::RequireLiteralType(SourceLocation Loc, QualType T,
4281 const PartialDiagnostic &PD) {
4282 assert(!T->isDependentType() && "type should not be dependent");
4284 QualType ElemType = Context.getBaseElementType(T);
4285 RequireCompleteType(Loc, ElemType, 0);
4287 if (T->isLiteralType())
4290 if (PD.getDiagID() == 0)
4295 if (T->isVariableArrayType())
4298 const RecordType *RT = ElemType->getAs<RecordType>();
4302 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl());
4304 // FIXME: Better diagnostic for incomplete class?
4305 if (!RD->isCompleteDefinition())
4308 // If the class has virtual base classes, then it's not an aggregate, and
4309 // cannot have any constexpr constructors or a trivial default constructor,
4310 // so is non-literal. This is better to diagnose than the resulting absence
4311 // of constexpr constructors.
4312 if (RD->getNumVBases()) {
4313 Diag(RD->getLocation(), diag::note_non_literal_virtual_base)
4314 << RD->isStruct() << RD->getNumVBases();
4315 for (CXXRecordDecl::base_class_const_iterator I = RD->vbases_begin(),
4316 E = RD->vbases_end(); I != E; ++I)
4317 Diag(I->getLocStart(),
4318 diag::note_constexpr_virtual_base_here) << I->getSourceRange();
4319 } else if (!RD->isAggregate() && !RD->hasConstexprNonCopyMoveConstructor() &&
4320 !RD->hasTrivialDefaultConstructor()) {
4321 Diag(RD->getLocation(), diag::note_non_literal_no_constexpr_ctors) << RD;
4322 } else if (RD->hasNonLiteralTypeFieldsOrBases()) {
4323 for (CXXRecordDecl::base_class_const_iterator I = RD->bases_begin(),
4324 E = RD->bases_end(); I != E; ++I) {
4325 if (!I->getType()->isLiteralType()) {
4326 Diag(I->getLocStart(),
4327 diag::note_non_literal_base_class)
4328 << RD << I->getType() << I->getSourceRange();
4332 for (CXXRecordDecl::field_iterator I = RD->field_begin(),
4333 E = RD->field_end(); I != E; ++I) {
4334 if (!(*I)->getType()->isLiteralType() ||
4335 (*I)->getType().isVolatileQualified()) {
4336 Diag((*I)->getLocation(), diag::note_non_literal_field)
4337 << RD << (*I) << (*I)->getType()
4338 << (*I)->getType().isVolatileQualified();
4342 } else if (!RD->hasTrivialDestructor()) {
4343 // All fields and bases are of literal types, so have trivial destructors.
4344 // If this class's destructor is non-trivial it must be user-declared.
4345 CXXDestructorDecl *Dtor = RD->getDestructor();
4346 assert(Dtor && "class has literal fields and bases but no dtor?");
4350 Diag(Dtor->getLocation(), Dtor->isUserProvided() ?
4351 diag::note_non_literal_user_provided_dtor :
4352 diag::note_non_literal_nontrivial_dtor) << RD;
4358 /// \brief Retrieve a version of the type 'T' that is elaborated by Keyword
4359 /// and qualified by the nested-name-specifier contained in SS.
4360 QualType Sema::getElaboratedType(ElaboratedTypeKeyword Keyword,
4361 const CXXScopeSpec &SS, QualType T) {
4364 NestedNameSpecifier *NNS;
4366 NNS = static_cast<NestedNameSpecifier *>(SS.getScopeRep());
4368 if (Keyword == ETK_None)
4372 return Context.getElaboratedType(Keyword, NNS, T);
4375 QualType Sema::BuildTypeofExprType(Expr *E, SourceLocation Loc) {
4376 ExprResult ER = CheckPlaceholderExpr(E);
4377 if (ER.isInvalid()) return QualType();
4380 if (!E->isTypeDependent()) {
4381 QualType T = E->getType();
4382 if (const TagType *TT = T->getAs<TagType>())
4383 DiagnoseUseOfDecl(TT->getDecl(), E->getExprLoc());
4385 return Context.getTypeOfExprType(E);
4388 /// getDecltypeForExpr - Given an expr, will return the decltype for
4389 /// that expression, according to the rules in C++11
4390 /// [dcl.type.simple]p4 and C++11 [expr.lambda.prim]p18.
4391 static QualType getDecltypeForExpr(Sema &S, Expr *E) {
4392 if (E->isTypeDependent())
4393 return S.Context.DependentTy;
4395 // C++11 [dcl.type.simple]p4:
4396 // The type denoted by decltype(e) is defined as follows:
4398 // - if e is an unparenthesized id-expression or an unparenthesized class
4399 // member access (5.2.5), decltype(e) is the type of the entity named
4400 // by e. If there is no such entity, or if e names a set of overloaded
4401 // functions, the program is ill-formed;
4402 if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E)) {
4403 if (const ValueDecl *VD = dyn_cast<ValueDecl>(DRE->getDecl()))
4404 return VD->getType();
4406 if (const MemberExpr *ME = dyn_cast<MemberExpr>(E)) {
4407 if (const FieldDecl *FD = dyn_cast<FieldDecl>(ME->getMemberDecl()))
4408 return FD->getType();
4411 // C++11 [expr.lambda.prim]p18:
4412 // Every occurrence of decltype((x)) where x is a possibly
4413 // parenthesized id-expression that names an entity of automatic
4414 // storage duration is treated as if x were transformed into an
4415 // access to a corresponding data member of the closure type that
4416 // would have been declared if x were an odr-use of the denoted
4418 using namespace sema;
4419 if (S.getCurLambda()) {
4420 if (isa<ParenExpr>(E)) {
4421 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E->IgnoreParens())) {
4422 if (VarDecl *Var = dyn_cast<VarDecl>(DRE->getDecl())) {
4423 QualType T = S.getCapturedDeclRefType(Var, DRE->getLocation());
4425 return S.Context.getLValueReferenceType(T);
4432 // C++11 [dcl.type.simple]p4:
4434 QualType T = E->getType();
4435 switch (E->getValueKind()) {
4436 // - otherwise, if e is an xvalue, decltype(e) is T&&, where T is the
4438 case VK_XValue: T = S.Context.getRValueReferenceType(T); break;
4439 // - otherwise, if e is an lvalue, decltype(e) is T&, where T is the
4441 case VK_LValue: T = S.Context.getLValueReferenceType(T); break;
4442 // - otherwise, decltype(e) is the type of e.
4443 case VK_RValue: break;
4449 QualType Sema::BuildDecltypeType(Expr *E, SourceLocation Loc) {
4450 ExprResult ER = CheckPlaceholderExpr(E);
4451 if (ER.isInvalid()) return QualType();
4454 return Context.getDecltypeType(E, getDecltypeForExpr(*this, E));
4457 QualType Sema::BuildUnaryTransformType(QualType BaseType,
4458 UnaryTransformType::UTTKind UKind,
4459 SourceLocation Loc) {
4461 case UnaryTransformType::EnumUnderlyingType:
4462 if (!BaseType->isDependentType() && !BaseType->isEnumeralType()) {
4463 Diag(Loc, diag::err_only_enums_have_underlying_types);
4466 QualType Underlying = BaseType;
4467 if (!BaseType->isDependentType()) {
4468 EnumDecl *ED = BaseType->getAs<EnumType>()->getDecl();
4469 assert(ED && "EnumType has no EnumDecl");
4470 DiagnoseUseOfDecl(ED, Loc);
4471 Underlying = ED->getIntegerType();
4473 assert(!Underlying.isNull());
4474 return Context.getUnaryTransformType(BaseType, Underlying,
4475 UnaryTransformType::EnumUnderlyingType);
4478 llvm_unreachable("unknown unary transform type");
4481 QualType Sema::BuildAtomicType(QualType T, SourceLocation Loc) {
4482 if (!T->isDependentType()) {
4483 // FIXME: It isn't entirely clear whether incomplete atomic types
4484 // are allowed or not; for simplicity, ban them for the moment.
4485 if (RequireCompleteType(Loc, T,
4486 PDiag(diag::err_atomic_specifier_bad_type) << 0))
4489 int DisallowedKind = -1;
4490 if (T->isArrayType())
4492 else if (T->isFunctionType())
4494 else if (T->isReferenceType())
4496 else if (T->isAtomicType())
4498 else if (T.hasQualifiers())
4500 else if (!T.isTriviallyCopyableType(Context))
4501 // Some other non-trivially-copyable type (probably a C++ class)
4504 if (DisallowedKind != -1) {
4505 Diag(Loc, diag::err_atomic_specifier_bad_type) << DisallowedKind << T;
4509 // FIXME: Do we need any handling for ARC here?
4512 // Build the pointer type.
4513 return Context.getAtomicType(T);