//===--- SemaType.cpp - Semantic Analysis for Types -----------------------===// // // The LLVM Compiler Infrastructure // // This file is distributed under the University of Illinois Open Source // License. See LICENSE.TXT for details. // //===----------------------------------------------------------------------===// // // This file implements type-related semantic analysis. // //===----------------------------------------------------------------------===// #include "clang/Sema/SemaInternal.h" #include "clang/AST/ASTContext.h" #include "clang/AST/ASTMutationListener.h" #include "clang/AST/CXXInheritance.h" #include "clang/AST/DeclObjC.h" #include "clang/AST/DeclTemplate.h" #include "clang/AST/Expr.h" #include "clang/AST/TypeLoc.h" #include "clang/AST/TypeLocVisitor.h" #include "clang/Basic/OpenCL.h" #include "clang/Basic/PartialDiagnostic.h" #include "clang/Basic/TargetInfo.h" #include "clang/Lex/Preprocessor.h" #include "clang/Parse/ParseDiagnostic.h" #include "clang/Sema/DeclSpec.h" #include "clang/Sema/DelayedDiagnostic.h" #include "clang/Sema/Lookup.h" #include "clang/Sema/ScopeInfo.h" #include "clang/Sema/Template.h" #include "llvm/ADT/SmallPtrSet.h" #include "llvm/ADT/SmallString.h" #include "llvm/Support/ErrorHandling.h" using namespace clang; /// isOmittedBlockReturnType - Return true if this declarator is missing a /// return type because this is a omitted return type on a block literal. static bool isOmittedBlockReturnType(const Declarator &D) { if (D.getContext() != Declarator::BlockLiteralContext || D.getDeclSpec().hasTypeSpecifier()) return false; if (D.getNumTypeObjects() == 0) return true; // ^{ ... } if (D.getNumTypeObjects() == 1 && D.getTypeObject(0).Kind == DeclaratorChunk::Function) return true; // ^(int X, float Y) { ... } return false; } /// diagnoseBadTypeAttribute - Diagnoses a type attribute which /// doesn't apply to the given type. static void diagnoseBadTypeAttribute(Sema &S, const AttributeList &attr, QualType type) { bool useExpansionLoc = false; unsigned diagID = 0; switch (attr.getKind()) { case AttributeList::AT_ObjCGC: diagID = diag::warn_pointer_attribute_wrong_type; useExpansionLoc = true; break; case AttributeList::AT_ObjCOwnership: diagID = diag::warn_objc_object_attribute_wrong_type; useExpansionLoc = true; break; default: // Assume everything else was a function attribute. diagID = diag::warn_function_attribute_wrong_type; break; } SourceLocation loc = attr.getLoc(); StringRef name = attr.getName()->getName(); // The GC attributes are usually written with macros; special-case them. if (useExpansionLoc && loc.isMacroID() && attr.getParameterName()) { if (attr.getParameterName()->isStr("strong")) { if (S.findMacroSpelling(loc, "__strong")) name = "__strong"; } else if (attr.getParameterName()->isStr("weak")) { if (S.findMacroSpelling(loc, "__weak")) name = "__weak"; } } S.Diag(loc, diagID) << name << type; } // objc_gc applies to Objective-C pointers or, otherwise, to the // smallest available pointer type (i.e. 'void*' in 'void**'). #define OBJC_POINTER_TYPE_ATTRS_CASELIST \ case AttributeList::AT_ObjCGC: \ case AttributeList::AT_ObjCOwnership // Function type attributes. #define FUNCTION_TYPE_ATTRS_CASELIST \ case AttributeList::AT_NoReturn: \ case AttributeList::AT_CDecl: \ case AttributeList::AT_FastCall: \ case AttributeList::AT_StdCall: \ case AttributeList::AT_ThisCall: \ case AttributeList::AT_Pascal: \ case AttributeList::AT_Regparm: \ case AttributeList::AT_Pcs: \ case AttributeList::AT_PnaclCall: \ case AttributeList::AT_IntelOclBicc \ namespace { /// An object which stores processing state for the entire /// GetTypeForDeclarator process. class TypeProcessingState { Sema &sema; /// The declarator being processed. Declarator &declarator; /// The index of the declarator chunk we're currently processing. /// May be the total number of valid chunks, indicating the /// DeclSpec. unsigned chunkIndex; /// Whether there are non-trivial modifications to the decl spec. bool trivial; /// Whether we saved the attributes in the decl spec. bool hasSavedAttrs; /// The original set of attributes on the DeclSpec. SmallVector savedAttrs; /// A list of attributes to diagnose the uselessness of when the /// processing is complete. SmallVector ignoredTypeAttrs; public: TypeProcessingState(Sema &sema, Declarator &declarator) : sema(sema), declarator(declarator), chunkIndex(declarator.getNumTypeObjects()), trivial(true), hasSavedAttrs(false) {} Sema &getSema() const { return sema; } Declarator &getDeclarator() const { return declarator; } bool isProcessingDeclSpec() const { return chunkIndex == declarator.getNumTypeObjects(); } unsigned getCurrentChunkIndex() const { return chunkIndex; } void setCurrentChunkIndex(unsigned idx) { assert(idx <= declarator.getNumTypeObjects()); chunkIndex = idx; } AttributeList *&getCurrentAttrListRef() const { if (isProcessingDeclSpec()) return getMutableDeclSpec().getAttributes().getListRef(); return declarator.getTypeObject(chunkIndex).getAttrListRef(); } /// Save the current set of attributes on the DeclSpec. void saveDeclSpecAttrs() { // Don't try to save them multiple times. if (hasSavedAttrs) return; DeclSpec &spec = getMutableDeclSpec(); for (AttributeList *attr = spec.getAttributes().getList(); attr; attr = attr->getNext()) savedAttrs.push_back(attr); trivial &= savedAttrs.empty(); hasSavedAttrs = true; } /// Record that we had nowhere to put the given type attribute. /// We will diagnose such attributes later. void addIgnoredTypeAttr(AttributeList &attr) { ignoredTypeAttrs.push_back(&attr); } /// Diagnose all the ignored type attributes, given that the /// declarator worked out to the given type. void diagnoseIgnoredTypeAttrs(QualType type) const { for (SmallVectorImpl::const_iterator i = ignoredTypeAttrs.begin(), e = ignoredTypeAttrs.end(); i != e; ++i) diagnoseBadTypeAttribute(getSema(), **i, type); } ~TypeProcessingState() { if (trivial) return; restoreDeclSpecAttrs(); } private: DeclSpec &getMutableDeclSpec() const { return const_cast(declarator.getDeclSpec()); } void restoreDeclSpecAttrs() { assert(hasSavedAttrs); if (savedAttrs.empty()) { getMutableDeclSpec().getAttributes().set(0); return; } getMutableDeclSpec().getAttributes().set(savedAttrs[0]); for (unsigned i = 0, e = savedAttrs.size() - 1; i != e; ++i) savedAttrs[i]->setNext(savedAttrs[i+1]); savedAttrs.back()->setNext(0); } }; /// Basically std::pair except that we really want to avoid an /// implicit operator= for safety concerns. It's also a minor /// link-time optimization for this to be a private type. struct AttrAndList { /// The attribute. AttributeList &first; /// The head of the list the attribute is currently in. AttributeList *&second; AttrAndList(AttributeList &attr, AttributeList *&head) : first(attr), second(head) {} }; } namespace llvm { template <> struct isPodLike { static const bool value = true; }; } static void spliceAttrIntoList(AttributeList &attr, AttributeList *&head) { attr.setNext(head); head = &attr; } static void spliceAttrOutOfList(AttributeList &attr, AttributeList *&head) { if (head == &attr) { head = attr.getNext(); return; } AttributeList *cur = head; while (true) { assert(cur && cur->getNext() && "ran out of attrs?"); if (cur->getNext() == &attr) { cur->setNext(attr.getNext()); return; } cur = cur->getNext(); } } static void moveAttrFromListToList(AttributeList &attr, AttributeList *&fromList, AttributeList *&toList) { spliceAttrOutOfList(attr, fromList); spliceAttrIntoList(attr, toList); } /// The location of a type attribute. enum TypeAttrLocation { /// The attribute is in the decl-specifier-seq. TAL_DeclSpec, /// The attribute is part of a DeclaratorChunk. TAL_DeclChunk, /// The attribute is immediately after the declaration's name. TAL_DeclName }; static void processTypeAttrs(TypeProcessingState &state, QualType &type, TypeAttrLocation TAL, AttributeList *attrs); static bool handleFunctionTypeAttr(TypeProcessingState &state, AttributeList &attr, QualType &type); static bool handleObjCGCTypeAttr(TypeProcessingState &state, AttributeList &attr, QualType &type); static bool handleObjCOwnershipTypeAttr(TypeProcessingState &state, AttributeList &attr, QualType &type); static bool handleObjCPointerTypeAttr(TypeProcessingState &state, AttributeList &attr, QualType &type) { if (attr.getKind() == AttributeList::AT_ObjCGC) return handleObjCGCTypeAttr(state, attr, type); assert(attr.getKind() == AttributeList::AT_ObjCOwnership); return handleObjCOwnershipTypeAttr(state, attr, type); } /// Given the index of a declarator chunk, check whether that chunk /// directly specifies the return type of a function and, if so, find /// an appropriate place for it. /// /// \param i - a notional index which the search will start /// immediately inside static DeclaratorChunk *maybeMovePastReturnType(Declarator &declarator, unsigned i) { assert(i <= declarator.getNumTypeObjects()); DeclaratorChunk *result = 0; // First, look inwards past parens for a function declarator. for (; i != 0; --i) { DeclaratorChunk &fnChunk = declarator.getTypeObject(i-1); switch (fnChunk.Kind) { case DeclaratorChunk::Paren: continue; // If we find anything except a function, bail out. case DeclaratorChunk::Pointer: case DeclaratorChunk::BlockPointer: case DeclaratorChunk::Array: case DeclaratorChunk::Reference: case DeclaratorChunk::MemberPointer: return result; // If we do find a function declarator, scan inwards from that, // looking for a block-pointer declarator. case DeclaratorChunk::Function: for (--i; i != 0; --i) { DeclaratorChunk &blockChunk = declarator.getTypeObject(i-1); switch (blockChunk.Kind) { case DeclaratorChunk::Paren: case DeclaratorChunk::Pointer: case DeclaratorChunk::Array: case DeclaratorChunk::Function: case DeclaratorChunk::Reference: case DeclaratorChunk::MemberPointer: continue; case DeclaratorChunk::BlockPointer: result = &blockChunk; goto continue_outer; } llvm_unreachable("bad declarator chunk kind"); } // If we run out of declarators doing that, we're done. return result; } llvm_unreachable("bad declarator chunk kind"); // Okay, reconsider from our new point. continue_outer: ; } // Ran out of chunks, bail out. return result; } /// Given that an objc_gc attribute was written somewhere on a /// declaration *other* than on the declarator itself (for which, use /// distributeObjCPointerTypeAttrFromDeclarator), and given that it /// didn't apply in whatever position it was written in, try to move /// it to a more appropriate position. static void distributeObjCPointerTypeAttr(TypeProcessingState &state, AttributeList &attr, QualType type) { Declarator &declarator = state.getDeclarator(); // Move it to the outermost normal or block pointer declarator. for (unsigned i = state.getCurrentChunkIndex(); i != 0; --i) { DeclaratorChunk &chunk = declarator.getTypeObject(i-1); switch (chunk.Kind) { case DeclaratorChunk::Pointer: case DeclaratorChunk::BlockPointer: { // But don't move an ARC ownership attribute to the return type // of a block. DeclaratorChunk *destChunk = 0; if (state.isProcessingDeclSpec() && attr.getKind() == AttributeList::AT_ObjCOwnership) destChunk = maybeMovePastReturnType(declarator, i - 1); if (!destChunk) destChunk = &chunk; moveAttrFromListToList(attr, state.getCurrentAttrListRef(), destChunk->getAttrListRef()); return; } case DeclaratorChunk::Paren: case DeclaratorChunk::Array: continue; // We may be starting at the return type of a block. case DeclaratorChunk::Function: if (state.isProcessingDeclSpec() && attr.getKind() == AttributeList::AT_ObjCOwnership) { if (DeclaratorChunk *dest = maybeMovePastReturnType(declarator, i)) { moveAttrFromListToList(attr, state.getCurrentAttrListRef(), dest->getAttrListRef()); return; } } goto error; // Don't walk through these. case DeclaratorChunk::Reference: case DeclaratorChunk::MemberPointer: goto error; } } error: diagnoseBadTypeAttribute(state.getSema(), attr, type); } /// Distribute an objc_gc type attribute that was written on the /// declarator. static void distributeObjCPointerTypeAttrFromDeclarator(TypeProcessingState &state, AttributeList &attr, QualType &declSpecType) { Declarator &declarator = state.getDeclarator(); // objc_gc goes on the innermost pointer to something that's not a // pointer. unsigned innermost = -1U; bool considerDeclSpec = true; for (unsigned i = 0, e = declarator.getNumTypeObjects(); i != e; ++i) { DeclaratorChunk &chunk = declarator.getTypeObject(i); switch (chunk.Kind) { case DeclaratorChunk::Pointer: case DeclaratorChunk::BlockPointer: innermost = i; continue; case DeclaratorChunk::Reference: case DeclaratorChunk::MemberPointer: case DeclaratorChunk::Paren: case DeclaratorChunk::Array: continue; case DeclaratorChunk::Function: considerDeclSpec = false; goto done; } } done: // That might actually be the decl spec if we weren't blocked by // anything in the declarator. if (considerDeclSpec) { if (handleObjCPointerTypeAttr(state, attr, declSpecType)) { // Splice the attribute into the decl spec. Prevents the // attribute from being applied multiple times and gives // the source-location-filler something to work with. state.saveDeclSpecAttrs(); moveAttrFromListToList(attr, declarator.getAttrListRef(), declarator.getMutableDeclSpec().getAttributes().getListRef()); return; } } // Otherwise, if we found an appropriate chunk, splice the attribute // into it. if (innermost != -1U) { moveAttrFromListToList(attr, declarator.getAttrListRef(), declarator.getTypeObject(innermost).getAttrListRef()); return; } // Otherwise, diagnose when we're done building the type. spliceAttrOutOfList(attr, declarator.getAttrListRef()); state.addIgnoredTypeAttr(attr); } /// A function type attribute was written somewhere in a declaration /// *other* than on the declarator itself or in the decl spec. Given /// that it didn't apply in whatever position it was written in, try /// to move it to a more appropriate position. static void distributeFunctionTypeAttr(TypeProcessingState &state, AttributeList &attr, QualType type) { Declarator &declarator = state.getDeclarator(); // Try to push the attribute from the return type of a function to // the function itself. for (unsigned i = state.getCurrentChunkIndex(); i != 0; --i) { DeclaratorChunk &chunk = declarator.getTypeObject(i-1); switch (chunk.Kind) { case DeclaratorChunk::Function: moveAttrFromListToList(attr, state.getCurrentAttrListRef(), chunk.getAttrListRef()); return; case DeclaratorChunk::Paren: case DeclaratorChunk::Pointer: case DeclaratorChunk::BlockPointer: case DeclaratorChunk::Array: case DeclaratorChunk::Reference: case DeclaratorChunk::MemberPointer: continue; } } diagnoseBadTypeAttribute(state.getSema(), attr, type); } /// Try to distribute a function type attribute to the innermost /// function chunk or type. Returns true if the attribute was /// distributed, false if no location was found. static bool distributeFunctionTypeAttrToInnermost(TypeProcessingState &state, AttributeList &attr, AttributeList *&attrList, QualType &declSpecType) { Declarator &declarator = state.getDeclarator(); // Put it on the innermost function chunk, if there is one. for (unsigned i = 0, e = declarator.getNumTypeObjects(); i != e; ++i) { DeclaratorChunk &chunk = declarator.getTypeObject(i); if (chunk.Kind != DeclaratorChunk::Function) continue; moveAttrFromListToList(attr, attrList, chunk.getAttrListRef()); return true; } if (handleFunctionTypeAttr(state, attr, declSpecType)) { spliceAttrOutOfList(attr, attrList); return true; } return false; } /// A function type attribute was written in the decl spec. Try to /// apply it somewhere. static void distributeFunctionTypeAttrFromDeclSpec(TypeProcessingState &state, AttributeList &attr, QualType &declSpecType) { state.saveDeclSpecAttrs(); // C++11 attributes before the decl specifiers actually appertain to // the declarators. Move them straight there. We don't support the // 'put them wherever you like' semantics we allow for GNU attributes. if (attr.isCXX11Attribute()) { moveAttrFromListToList(attr, state.getCurrentAttrListRef(), state.getDeclarator().getAttrListRef()); return; } // Try to distribute to the innermost. if (distributeFunctionTypeAttrToInnermost(state, attr, state.getCurrentAttrListRef(), declSpecType)) return; // If that failed, diagnose the bad attribute when the declarator is // fully built. state.addIgnoredTypeAttr(attr); } /// A function type attribute was written on the declarator. Try to /// apply it somewhere. static void distributeFunctionTypeAttrFromDeclarator(TypeProcessingState &state, AttributeList &attr, QualType &declSpecType) { Declarator &declarator = state.getDeclarator(); // Try to distribute to the innermost. if (distributeFunctionTypeAttrToInnermost(state, attr, declarator.getAttrListRef(), declSpecType)) return; // If that failed, diagnose the bad attribute when the declarator is // fully built. spliceAttrOutOfList(attr, declarator.getAttrListRef()); state.addIgnoredTypeAttr(attr); } /// \brief Given that there are attributes written on the declarator /// itself, try to distribute any type attributes to the appropriate /// declarator chunk. /// /// These are attributes like the following: /// int f ATTR; /// int (f ATTR)(); /// but not necessarily this: /// int f() ATTR; static void distributeTypeAttrsFromDeclarator(TypeProcessingState &state, QualType &declSpecType) { // Collect all the type attributes from the declarator itself. assert(state.getDeclarator().getAttributes() && "declarator has no attrs!"); AttributeList *attr = state.getDeclarator().getAttributes(); AttributeList *next; do { next = attr->getNext(); // Do not distribute C++11 attributes. They have strict rules for what // they appertain to. if (attr->isCXX11Attribute()) continue; switch (attr->getKind()) { OBJC_POINTER_TYPE_ATTRS_CASELIST: distributeObjCPointerTypeAttrFromDeclarator(state, *attr, declSpecType); break; case AttributeList::AT_NSReturnsRetained: if (!state.getSema().getLangOpts().ObjCAutoRefCount) break; // fallthrough FUNCTION_TYPE_ATTRS_CASELIST: distributeFunctionTypeAttrFromDeclarator(state, *attr, declSpecType); break; default: break; } } while ((attr = next)); } /// Add a synthetic '()' to a block-literal declarator if it is /// required, given the return type. static void maybeSynthesizeBlockSignature(TypeProcessingState &state, QualType declSpecType) { Declarator &declarator = state.getDeclarator(); // First, check whether the declarator would produce a function, // i.e. whether the innermost semantic chunk is a function. if (declarator.isFunctionDeclarator()) { // If so, make that declarator a prototyped declarator. declarator.getFunctionTypeInfo().hasPrototype = true; return; } // If there are any type objects, the type as written won't name a // function, regardless of the decl spec type. This is because a // block signature declarator is always an abstract-declarator, and // abstract-declarators can't just be parentheses chunks. Therefore // we need to build a function chunk unless there are no type // objects and the decl spec type is a function. if (!declarator.getNumTypeObjects() && declSpecType->isFunctionType()) return; // Note that there *are* cases with invalid declarators where // declarators consist solely of parentheses. In general, these // occur only in failed efforts to make function declarators, so // faking up the function chunk is still the right thing to do. // Otherwise, we need to fake up a function declarator. SourceLocation loc = declarator.getLocStart(); // ...and *prepend* it to the declarator. SourceLocation NoLoc; declarator.AddInnermostTypeInfo(DeclaratorChunk::getFunction( /*HasProto=*/true, /*IsAmbiguous=*/false, /*LParenLoc=*/NoLoc, /*ArgInfo=*/0, /*NumArgs=*/0, /*EllipsisLoc=*/NoLoc, /*RParenLoc=*/NoLoc, /*TypeQuals=*/0, /*RefQualifierIsLvalueRef=*/true, /*RefQualifierLoc=*/NoLoc, /*ConstQualifierLoc=*/NoLoc, /*VolatileQualifierLoc=*/NoLoc, /*MutableLoc=*/NoLoc, EST_None, /*ESpecLoc=*/NoLoc, /*Exceptions=*/0, /*ExceptionRanges=*/0, /*NumExceptions=*/0, /*NoexceptExpr=*/0, loc, loc, declarator)); // For consistency, make sure the state still has us as processing // the decl spec. assert(state.getCurrentChunkIndex() == declarator.getNumTypeObjects() - 1); state.setCurrentChunkIndex(declarator.getNumTypeObjects()); } /// \brief Convert the specified declspec to the appropriate type /// object. /// \param state Specifies the declarator containing the declaration specifier /// to be converted, along with other associated processing state. /// \returns The type described by the declaration specifiers. This function /// never returns null. static QualType ConvertDeclSpecToType(TypeProcessingState &state) { // FIXME: Should move the logic from DeclSpec::Finish to here for validity // checking. Sema &S = state.getSema(); Declarator &declarator = state.getDeclarator(); const DeclSpec &DS = declarator.getDeclSpec(); SourceLocation DeclLoc = declarator.getIdentifierLoc(); if (DeclLoc.isInvalid()) DeclLoc = DS.getLocStart(); ASTContext &Context = S.Context; QualType Result; switch (DS.getTypeSpecType()) { case DeclSpec::TST_void: Result = Context.VoidTy; break; case DeclSpec::TST_char: if (DS.getTypeSpecSign() == DeclSpec::TSS_unspecified) Result = Context.CharTy; else if (DS.getTypeSpecSign() == DeclSpec::TSS_signed) Result = Context.SignedCharTy; else { assert(DS.getTypeSpecSign() == DeclSpec::TSS_unsigned && "Unknown TSS value"); Result = Context.UnsignedCharTy; } break; case DeclSpec::TST_wchar: if (DS.getTypeSpecSign() == DeclSpec::TSS_unspecified) Result = Context.WCharTy; else if (DS.getTypeSpecSign() == DeclSpec::TSS_signed) { S.Diag(DS.getTypeSpecSignLoc(), diag::ext_invalid_sign_spec) << DS.getSpecifierName(DS.getTypeSpecType()); Result = Context.getSignedWCharType(); } else { assert(DS.getTypeSpecSign() == DeclSpec::TSS_unsigned && "Unknown TSS value"); S.Diag(DS.getTypeSpecSignLoc(), diag::ext_invalid_sign_spec) << DS.getSpecifierName(DS.getTypeSpecType()); Result = Context.getUnsignedWCharType(); } break; case DeclSpec::TST_char16: assert(DS.getTypeSpecSign() == DeclSpec::TSS_unspecified && "Unknown TSS value"); Result = Context.Char16Ty; break; case DeclSpec::TST_char32: assert(DS.getTypeSpecSign() == DeclSpec::TSS_unspecified && "Unknown TSS value"); Result = Context.Char32Ty; break; case DeclSpec::TST_unspecified: // "" is an objc qualified ID with a missing id. if (DeclSpec::ProtocolQualifierListTy PQ = DS.getProtocolQualifiers()) { Result = Context.getObjCObjectType(Context.ObjCBuiltinIdTy, (ObjCProtocolDecl*const*)PQ, DS.getNumProtocolQualifiers()); Result = Context.getObjCObjectPointerType(Result); break; } // If this is a missing declspec in a block literal return context, then it // is inferred from the return statements inside the block. // The declspec is always missing in a lambda expr context; it is either // specified with a trailing return type or inferred. if (declarator.getContext() == Declarator::LambdaExprContext || isOmittedBlockReturnType(declarator)) { Result = Context.DependentTy; break; } // Unspecified typespec defaults to int in C90. However, the C90 grammar // [C90 6.5] only allows a decl-spec if there was *some* type-specifier, // type-qualifier, or storage-class-specifier. If not, emit an extwarn. // Note that the one exception to this is function definitions, which are // allowed to be completely missing a declspec. This is handled in the // parser already though by it pretending to have seen an 'int' in this // case. if (S.getLangOpts().ImplicitInt) { // In C89 mode, we only warn if there is a completely missing declspec // when one is not allowed. if (DS.isEmpty()) { S.Diag(DeclLoc, diag::ext_missing_declspec) << DS.getSourceRange() << FixItHint::CreateInsertion(DS.getLocStart(), "int"); } } else if (!DS.hasTypeSpecifier()) { // C99 and C++ require a type specifier. For example, C99 6.7.2p2 says: // "At least one type specifier shall be given in the declaration // specifiers in each declaration, and in the specifier-qualifier list in // each struct declaration and type name." // FIXME: Does Microsoft really have the implicit int extension in C++? if (S.getLangOpts().CPlusPlus && !S.getLangOpts().MicrosoftExt) { S.Diag(DeclLoc, diag::err_missing_type_specifier) << DS.getSourceRange(); // When this occurs in C++ code, often something is very broken with the // value being declared, poison it as invalid so we don't get chains of // errors. declarator.setInvalidType(true); } else { S.Diag(DeclLoc, diag::ext_missing_type_specifier) << DS.getSourceRange(); } } // FALL THROUGH. case DeclSpec::TST_int: { if (DS.getTypeSpecSign() != DeclSpec::TSS_unsigned) { switch (DS.getTypeSpecWidth()) { case DeclSpec::TSW_unspecified: Result = Context.IntTy; break; case DeclSpec::TSW_short: Result = Context.ShortTy; break; case DeclSpec::TSW_long: Result = Context.LongTy; break; case DeclSpec::TSW_longlong: Result = Context.LongLongTy; // 'long long' is a C99 or C++11 feature. if (!S.getLangOpts().C99) { if (S.getLangOpts().CPlusPlus) S.Diag(DS.getTypeSpecWidthLoc(), S.getLangOpts().CPlusPlus11 ? diag::warn_cxx98_compat_longlong : diag::ext_cxx11_longlong); else S.Diag(DS.getTypeSpecWidthLoc(), diag::ext_c99_longlong); } break; } } else { switch (DS.getTypeSpecWidth()) { case DeclSpec::TSW_unspecified: Result = Context.UnsignedIntTy; break; case DeclSpec::TSW_short: Result = Context.UnsignedShortTy; break; case DeclSpec::TSW_long: Result = Context.UnsignedLongTy; break; case DeclSpec::TSW_longlong: Result = Context.UnsignedLongLongTy; // 'long long' is a C99 or C++11 feature. if (!S.getLangOpts().C99) { if (S.getLangOpts().CPlusPlus) S.Diag(DS.getTypeSpecWidthLoc(), S.getLangOpts().CPlusPlus11 ? diag::warn_cxx98_compat_longlong : diag::ext_cxx11_longlong); else S.Diag(DS.getTypeSpecWidthLoc(), diag::ext_c99_longlong); } break; } } break; } case DeclSpec::TST_int128: if (!S.PP.getTargetInfo().hasInt128Type()) S.Diag(DS.getTypeSpecTypeLoc(), diag::err_int128_unsupported); if (DS.getTypeSpecSign() == DeclSpec::TSS_unsigned) Result = Context.UnsignedInt128Ty; else Result = Context.Int128Ty; break; case DeclSpec::TST_half: Result = Context.HalfTy; break; case DeclSpec::TST_float: Result = Context.FloatTy; break; case DeclSpec::TST_double: if (DS.getTypeSpecWidth() == DeclSpec::TSW_long) Result = Context.LongDoubleTy; else Result = Context.DoubleTy; if (S.getLangOpts().OpenCL && !S.getOpenCLOptions().cl_khr_fp64) { S.Diag(DS.getTypeSpecTypeLoc(), diag::err_double_requires_fp64); declarator.setInvalidType(true); } break; case DeclSpec::TST_bool: Result = Context.BoolTy; break; // _Bool or bool case DeclSpec::TST_decimal32: // _Decimal32 case DeclSpec::TST_decimal64: // _Decimal64 case DeclSpec::TST_decimal128: // _Decimal128 S.Diag(DS.getTypeSpecTypeLoc(), diag::err_decimal_unsupported); Result = Context.IntTy; declarator.setInvalidType(true); break; case DeclSpec::TST_class: case DeclSpec::TST_enum: case DeclSpec::TST_union: case DeclSpec::TST_struct: case DeclSpec::TST_interface: { TypeDecl *D = dyn_cast_or_null(DS.getRepAsDecl()); if (!D) { // This can happen in C++ with ambiguous lookups. Result = Context.IntTy; declarator.setInvalidType(true); break; } // If the type is deprecated or unavailable, diagnose it. S.DiagnoseUseOfDecl(D, DS.getTypeSpecTypeNameLoc()); assert(DS.getTypeSpecWidth() == 0 && DS.getTypeSpecComplex() == 0 && DS.getTypeSpecSign() == 0 && "No qualifiers on tag names!"); // TypeQuals handled by caller. Result = Context.getTypeDeclType(D); // In both C and C++, make an ElaboratedType. ElaboratedTypeKeyword Keyword = ElaboratedType::getKeywordForTypeSpec(DS.getTypeSpecType()); Result = S.getElaboratedType(Keyword, DS.getTypeSpecScope(), Result); break; } case DeclSpec::TST_typename: { assert(DS.getTypeSpecWidth() == 0 && DS.getTypeSpecComplex() == 0 && DS.getTypeSpecSign() == 0 && "Can't handle qualifiers on typedef names yet!"); Result = S.GetTypeFromParser(DS.getRepAsType()); if (Result.isNull()) declarator.setInvalidType(true); else if (DeclSpec::ProtocolQualifierListTy PQ = DS.getProtocolQualifiers()) { if (const ObjCObjectType *ObjT = Result->getAs()) { // Silently drop any existing protocol qualifiers. // TODO: determine whether that's the right thing to do. if (ObjT->getNumProtocols()) Result = ObjT->getBaseType(); if (DS.getNumProtocolQualifiers()) Result = Context.getObjCObjectType(Result, (ObjCProtocolDecl*const*) PQ, DS.getNumProtocolQualifiers()); } else if (Result->isObjCIdType()) { // id Result = Context.getObjCObjectType(Context.ObjCBuiltinIdTy, (ObjCProtocolDecl*const*) PQ, DS.getNumProtocolQualifiers()); Result = Context.getObjCObjectPointerType(Result); } else if (Result->isObjCClassType()) { // Class Result = Context.getObjCObjectType(Context.ObjCBuiltinClassTy, (ObjCProtocolDecl*const*) PQ, DS.getNumProtocolQualifiers()); Result = Context.getObjCObjectPointerType(Result); } else { S.Diag(DeclLoc, diag::err_invalid_protocol_qualifiers) << DS.getSourceRange(); declarator.setInvalidType(true); } } // TypeQuals handled by caller. break; } case DeclSpec::TST_typeofType: // FIXME: Preserve type source info. Result = S.GetTypeFromParser(DS.getRepAsType()); assert(!Result.isNull() && "Didn't get a type for typeof?"); if (!Result->isDependentType()) if (const TagType *TT = Result->getAs()) S.DiagnoseUseOfDecl(TT->getDecl(), DS.getTypeSpecTypeLoc()); // TypeQuals handled by caller. Result = Context.getTypeOfType(Result); break; case DeclSpec::TST_typeofExpr: { Expr *E = DS.getRepAsExpr(); assert(E && "Didn't get an expression for typeof?"); // TypeQuals handled by caller. Result = S.BuildTypeofExprType(E, DS.getTypeSpecTypeLoc()); if (Result.isNull()) { Result = Context.IntTy; declarator.setInvalidType(true); } break; } case DeclSpec::TST_decltype: { Expr *E = DS.getRepAsExpr(); assert(E && "Didn't get an expression for decltype?"); // TypeQuals handled by caller. Result = S.BuildDecltypeType(E, DS.getTypeSpecTypeLoc()); if (Result.isNull()) { Result = Context.IntTy; declarator.setInvalidType(true); } break; } case DeclSpec::TST_underlyingType: Result = S.GetTypeFromParser(DS.getRepAsType()); assert(!Result.isNull() && "Didn't get a type for __underlying_type?"); Result = S.BuildUnaryTransformType(Result, UnaryTransformType::EnumUnderlyingType, DS.getTypeSpecTypeLoc()); if (Result.isNull()) { Result = Context.IntTy; declarator.setInvalidType(true); } break; case DeclSpec::TST_auto: { // TypeQuals handled by caller. Result = Context.getAutoType(QualType()); break; } case DeclSpec::TST_unknown_anytype: Result = Context.UnknownAnyTy; break; case DeclSpec::TST_atomic: Result = S.GetTypeFromParser(DS.getRepAsType()); assert(!Result.isNull() && "Didn't get a type for _Atomic?"); Result = S.BuildAtomicType(Result, DS.getTypeSpecTypeLoc()); if (Result.isNull()) { Result = Context.IntTy; declarator.setInvalidType(true); } break; case DeclSpec::TST_image1d_t: Result = Context.OCLImage1dTy; break; case DeclSpec::TST_image1d_array_t: Result = Context.OCLImage1dArrayTy; break; case DeclSpec::TST_image1d_buffer_t: Result = Context.OCLImage1dBufferTy; break; case DeclSpec::TST_image2d_t: Result = Context.OCLImage2dTy; break; case DeclSpec::TST_image2d_array_t: Result = Context.OCLImage2dArrayTy; break; case DeclSpec::TST_image3d_t: Result = Context.OCLImage3dTy; break; case DeclSpec::TST_sampler_t: Result = Context.OCLSamplerTy; break; case DeclSpec::TST_event_t: Result = Context.OCLEventTy; break; case DeclSpec::TST_error: Result = Context.IntTy; declarator.setInvalidType(true); break; } // Handle complex types. if (DS.getTypeSpecComplex() == DeclSpec::TSC_complex) { if (S.getLangOpts().Freestanding) S.Diag(DS.getTypeSpecComplexLoc(), diag::ext_freestanding_complex); Result = Context.getComplexType(Result); } else if (DS.isTypeAltiVecVector()) { unsigned typeSize = static_cast(Context.getTypeSize(Result)); assert(typeSize > 0 && "type size for vector must be greater than 0 bits"); VectorType::VectorKind VecKind = VectorType::AltiVecVector; if (DS.isTypeAltiVecPixel()) VecKind = VectorType::AltiVecPixel; else if (DS.isTypeAltiVecBool()) VecKind = VectorType::AltiVecBool; Result = Context.getVectorType(Result, 128/typeSize, VecKind); } // FIXME: Imaginary. if (DS.getTypeSpecComplex() == DeclSpec::TSC_imaginary) S.Diag(DS.getTypeSpecComplexLoc(), diag::err_imaginary_not_supported); // Before we process any type attributes, synthesize a block literal // function declarator if necessary. if (declarator.getContext() == Declarator::BlockLiteralContext) maybeSynthesizeBlockSignature(state, Result); // Apply any type attributes from the decl spec. This may cause the // list of type attributes to be temporarily saved while the type // attributes are pushed around. if (AttributeList *attrs = DS.getAttributes().getList()) processTypeAttrs(state, Result, TAL_DeclSpec, attrs); // Apply const/volatile/restrict qualifiers to T. if (unsigned TypeQuals = DS.getTypeQualifiers()) { // Warn about CV qualifiers on functions: C99 6.7.3p8: "If the specification // of a function type includes any type qualifiers, the behavior is // undefined." if (Result->isFunctionType() && TypeQuals) { if (TypeQuals & DeclSpec::TQ_const) S.Diag(DS.getConstSpecLoc(), diag::warn_typecheck_function_qualifiers) << Result << DS.getSourceRange(); else if (TypeQuals & DeclSpec::TQ_volatile) S.Diag(DS.getVolatileSpecLoc(), diag::warn_typecheck_function_qualifiers) << Result << DS.getSourceRange(); else { assert((TypeQuals & (DeclSpec::TQ_restrict | DeclSpec::TQ_atomic)) && "Has CVRA quals but not C, V, R, or A?"); // No diagnostic; we'll diagnose 'restrict' or '_Atomic' applied to a // function type later, in BuildQualifiedType. } } // C++ [dcl.ref]p1: // Cv-qualified references are ill-formed except when the // cv-qualifiers are introduced through the use of a typedef // (7.1.3) or of a template type argument (14.3), in which // case the cv-qualifiers are ignored. // FIXME: Shouldn't we be checking SCS_typedef here? if (DS.getTypeSpecType() == DeclSpec::TST_typename && TypeQuals && Result->isReferenceType()) { TypeQuals &= ~DeclSpec::TQ_const; TypeQuals &= ~DeclSpec::TQ_volatile; TypeQuals &= ~DeclSpec::TQ_atomic; } // C90 6.5.3 constraints: "The same type qualifier shall not appear more // than once in the same specifier-list or qualifier-list, either directly // or via one or more typedefs." if (!S.getLangOpts().C99 && !S.getLangOpts().CPlusPlus && TypeQuals & Result.getCVRQualifiers()) { if (TypeQuals & DeclSpec::TQ_const && Result.isConstQualified()) { S.Diag(DS.getConstSpecLoc(), diag::ext_duplicate_declspec) << "const"; } if (TypeQuals & DeclSpec::TQ_volatile && Result.isVolatileQualified()) { S.Diag(DS.getVolatileSpecLoc(), diag::ext_duplicate_declspec) << "volatile"; } // C90 doesn't have restrict nor _Atomic, so it doesn't force us to // produce a warning in this case. } QualType Qualified = S.BuildQualifiedType(Result, DeclLoc, TypeQuals, &DS); // If adding qualifiers fails, just use the unqualified type. if (Qualified.isNull()) declarator.setInvalidType(true); else Result = Qualified; } return Result; } static std::string getPrintableNameForEntity(DeclarationName Entity) { if (Entity) return Entity.getAsString(); return "type name"; } QualType Sema::BuildQualifiedType(QualType T, SourceLocation Loc, Qualifiers Qs, const DeclSpec *DS) { // Enforce C99 6.7.3p2: "Types other than pointer types derived from // object or incomplete types shall not be restrict-qualified." if (Qs.hasRestrict()) { unsigned DiagID = 0; QualType ProblemTy; if (T->isAnyPointerType() || T->isReferenceType() || T->isMemberPointerType()) { QualType EltTy; if (T->isObjCObjectPointerType()) EltTy = T; else if (const MemberPointerType *PTy = T->getAs()) EltTy = PTy->getPointeeType(); else EltTy = T->getPointeeType(); // If we have a pointer or reference, the pointee must have an object // incomplete type. if (!EltTy->isIncompleteOrObjectType()) { DiagID = diag::err_typecheck_invalid_restrict_invalid_pointee; ProblemTy = EltTy; } } else if (!T->isDependentType()) { DiagID = diag::err_typecheck_invalid_restrict_not_pointer; ProblemTy = T; } if (DiagID) { Diag(DS ? DS->getRestrictSpecLoc() : Loc, DiagID) << ProblemTy; Qs.removeRestrict(); } } return Context.getQualifiedType(T, Qs); } QualType Sema::BuildQualifiedType(QualType T, SourceLocation Loc, unsigned CVRA, const DeclSpec *DS) { // Convert from DeclSpec::TQ to Qualifiers::TQ by just dropping TQ_atomic. unsigned CVR = CVRA & ~DeclSpec::TQ_atomic; // C11 6.7.3/5: // If the same qualifier appears more than once in the same // specifier-qualifier-list, either directly or via one or more typedefs, // the behavior is the same as if it appeared only once. // // It's not specified what happens when the _Atomic qualifier is applied to // a type specified with the _Atomic specifier, but we assume that this // should be treated as if the _Atomic qualifier appeared multiple times. if (CVRA & DeclSpec::TQ_atomic && !T->isAtomicType()) { // C11 6.7.3/5: // If other qualifiers appear along with the _Atomic qualifier in a // specifier-qualifier-list, the resulting type is the so-qualified // atomic type. // // Don't need to worry about array types here, since _Atomic can't be // applied to such types. SplitQualType Split = T.getSplitUnqualifiedType(); T = BuildAtomicType(QualType(Split.Ty, 0), DS ? DS->getAtomicSpecLoc() : Loc); if (T.isNull()) return T; Split.Quals.addCVRQualifiers(CVR); return BuildQualifiedType(T, Loc, Split.Quals); } return BuildQualifiedType(T, Loc, Qualifiers::fromCVRMask(CVR), DS); } /// \brief Build a paren type including \p T. QualType Sema::BuildParenType(QualType T) { return Context.getParenType(T); } /// Given that we're building a pointer or reference to the given static QualType inferARCLifetimeForPointee(Sema &S, QualType type, SourceLocation loc, bool isReference) { // Bail out if retention is unrequired or already specified. if (!type->isObjCLifetimeType() || type.getObjCLifetime() != Qualifiers::OCL_None) return type; Qualifiers::ObjCLifetime implicitLifetime = Qualifiers::OCL_None; // If the object type is const-qualified, we can safely use // __unsafe_unretained. This is safe (because there are no read // barriers), and it'll be safe to coerce anything but __weak* to // the resulting type. if (type.isConstQualified()) { implicitLifetime = Qualifiers::OCL_ExplicitNone; // Otherwise, check whether the static type does not require // retaining. This currently only triggers for Class (possibly // protocol-qualifed, and arrays thereof). } else if (type->isObjCARCImplicitlyUnretainedType()) { implicitLifetime = Qualifiers::OCL_ExplicitNone; // If we are in an unevaluated context, like sizeof, skip adding a // qualification. } else if (S.isUnevaluatedContext()) { return type; // If that failed, give an error and recover using __strong. __strong // is the option most likely to prevent spurious second-order diagnostics, // like when binding a reference to a field. } else { // These types can show up in private ivars in system headers, so // we need this to not be an error in those cases. Instead we // want to delay. if (S.DelayedDiagnostics.shouldDelayDiagnostics()) { S.DelayedDiagnostics.add( sema::DelayedDiagnostic::makeForbiddenType(loc, diag::err_arc_indirect_no_ownership, type, isReference)); } else { S.Diag(loc, diag::err_arc_indirect_no_ownership) << type << isReference; } implicitLifetime = Qualifiers::OCL_Strong; } assert(implicitLifetime && "didn't infer any lifetime!"); Qualifiers qs; qs.addObjCLifetime(implicitLifetime); return S.Context.getQualifiedType(type, qs); } /// \brief Build a pointer type. /// /// \param T The type to which we'll be building a pointer. /// /// \param Loc The location of the entity whose type involves this /// pointer type or, if there is no such entity, the location of the /// type that will have pointer type. /// /// \param Entity The name of the entity that involves the pointer /// type, if known. /// /// \returns A suitable pointer type, if there are no /// errors. Otherwise, returns a NULL type. QualType Sema::BuildPointerType(QualType T, SourceLocation Loc, DeclarationName Entity) { if (T->isReferenceType()) { // C++ 8.3.2p4: There shall be no ... pointers to references ... Diag(Loc, diag::err_illegal_decl_pointer_to_reference) << getPrintableNameForEntity(Entity) << T; return QualType(); } assert(!T->isObjCObjectType() && "Should build ObjCObjectPointerType"); // In ARC, it is forbidden to build pointers to unqualified pointers. if (getLangOpts().ObjCAutoRefCount) T = inferARCLifetimeForPointee(*this, T, Loc, /*reference*/ false); // Build the pointer type. return Context.getPointerType(T); } /// \brief Build a reference type. /// /// \param T The type to which we'll be building a reference. /// /// \param Loc The location of the entity whose type involves this /// reference type or, if there is no such entity, the location of the /// type that will have reference type. /// /// \param Entity The name of the entity that involves the reference /// type, if known. /// /// \returns A suitable reference type, if there are no /// errors. Otherwise, returns a NULL type. QualType Sema::BuildReferenceType(QualType T, bool SpelledAsLValue, SourceLocation Loc, DeclarationName Entity) { assert(Context.getCanonicalType(T) != Context.OverloadTy && "Unresolved overloaded function type"); // C++0x [dcl.ref]p6: // If a typedef (7.1.3), a type template-parameter (14.3.1), or a // decltype-specifier (7.1.6.2) denotes a type TR that is a reference to a // type T, an attempt to create the type "lvalue reference to cv TR" creates // the type "lvalue reference to T", while an attempt to create the type // "rvalue reference to cv TR" creates the type TR. bool LValueRef = SpelledAsLValue || T->getAs(); // C++ [dcl.ref]p4: There shall be no references to references. // // According to C++ DR 106, references to references are only // diagnosed when they are written directly (e.g., "int & &"), // but not when they happen via a typedef: // // typedef int& intref; // typedef intref& intref2; // // Parser::ParseDeclaratorInternal diagnoses the case where // references are written directly; here, we handle the // collapsing of references-to-references as described in C++0x. // DR 106 and 540 introduce reference-collapsing into C++98/03. // C++ [dcl.ref]p1: // A declarator that specifies the type "reference to cv void" // is ill-formed. if (T->isVoidType()) { Diag(Loc, diag::err_reference_to_void); return QualType(); } // In ARC, it is forbidden to build references to unqualified pointers. if (getLangOpts().ObjCAutoRefCount) T = inferARCLifetimeForPointee(*this, T, Loc, /*reference*/ true); // Handle restrict on references. if (LValueRef) return Context.getLValueReferenceType(T, SpelledAsLValue); return Context.getRValueReferenceType(T); } /// Check whether the specified array size makes the array type a VLA. If so, /// return true, if not, return the size of the array in SizeVal. static bool isArraySizeVLA(Sema &S, Expr *ArraySize, llvm::APSInt &SizeVal) { // If the size is an ICE, it certainly isn't a VLA. If we're in a GNU mode // (like gnu99, but not c99) accept any evaluatable value as an extension. class VLADiagnoser : public Sema::VerifyICEDiagnoser { public: VLADiagnoser() : Sema::VerifyICEDiagnoser(true) {} virtual void diagnoseNotICE(Sema &S, SourceLocation Loc, SourceRange SR) { } virtual void diagnoseFold(Sema &S, SourceLocation Loc, SourceRange SR) { S.Diag(Loc, diag::ext_vla_folded_to_constant) << SR; } } Diagnoser; return S.VerifyIntegerConstantExpression(ArraySize, &SizeVal, Diagnoser, S.LangOpts.GNUMode).isInvalid(); } /// \brief Build an array type. /// /// \param T The type of each element in the array. /// /// \param ASM C99 array size modifier (e.g., '*', 'static'). /// /// \param ArraySize Expression describing the size of the array. /// /// \param Brackets The range from the opening '[' to the closing ']'. /// /// \param Entity The name of the entity that involves the array /// type, if known. /// /// \returns A suitable array type, if there are no errors. Otherwise, /// returns a NULL type. QualType Sema::BuildArrayType(QualType T, ArrayType::ArraySizeModifier ASM, Expr *ArraySize, unsigned Quals, SourceRange Brackets, DeclarationName Entity) { SourceLocation Loc = Brackets.getBegin(); if (getLangOpts().CPlusPlus) { // C++ [dcl.array]p1: // T is called the array element type; this type shall not be a reference // type, the (possibly cv-qualified) type void, a function type or an // abstract class type. // // C++ [dcl.array]p3: // When several "array of" specifications are adjacent, [...] only the // first of the constant expressions that specify the bounds of the arrays // may be omitted. // // Note: function types are handled in the common path with C. if (T->isReferenceType()) { Diag(Loc, diag::err_illegal_decl_array_of_references) << getPrintableNameForEntity(Entity) << T; return QualType(); } if (T->isVoidType() || T->isIncompleteArrayType()) { Diag(Loc, diag::err_illegal_decl_array_incomplete_type) << T; return QualType(); } if (RequireNonAbstractType(Brackets.getBegin(), T, diag::err_array_of_abstract_type)) return QualType(); } else { // C99 6.7.5.2p1: If the element type is an incomplete or function type, // reject it (e.g. void ary[7], struct foo ary[7], void ary[7]()) if (RequireCompleteType(Loc, T, diag::err_illegal_decl_array_incomplete_type)) return QualType(); } if (T->isFunctionType()) { Diag(Loc, diag::err_illegal_decl_array_of_functions) << getPrintableNameForEntity(Entity) << T; return QualType(); } if (T->getContainedAutoType()) { Diag(Loc, diag::err_illegal_decl_array_of_auto) << getPrintableNameForEntity(Entity) << T; return QualType(); } if (const RecordType *EltTy = T->getAs()) { // If the element type is a struct or union that contains a variadic // array, accept it as a GNU extension: C99 6.7.2.1p2. if (EltTy->getDecl()->hasFlexibleArrayMember()) Diag(Loc, diag::ext_flexible_array_in_array) << T; } else if (T->isObjCObjectType()) { Diag(Loc, diag::err_objc_array_of_interfaces) << T; return QualType(); } // Do placeholder conversions on the array size expression. if (ArraySize && ArraySize->hasPlaceholderType()) { ExprResult Result = CheckPlaceholderExpr(ArraySize); if (Result.isInvalid()) return QualType(); ArraySize = Result.take(); } // Do lvalue-to-rvalue conversions on the array size expression. if (ArraySize && !ArraySize->isRValue()) { ExprResult Result = DefaultLvalueConversion(ArraySize); if (Result.isInvalid()) return QualType(); ArraySize = Result.take(); } // C99 6.7.5.2p1: The size expression shall have integer type. // C++11 allows contextual conversions to such types. if (!getLangOpts().CPlusPlus11 && ArraySize && !ArraySize->isTypeDependent() && !ArraySize->getType()->isIntegralOrUnscopedEnumerationType()) { Diag(ArraySize->getLocStart(), diag::err_array_size_non_int) << ArraySize->getType() << ArraySize->getSourceRange(); return QualType(); } llvm::APSInt ConstVal(Context.getTypeSize(Context.getSizeType())); if (!ArraySize) { if (ASM == ArrayType::Star) T = Context.getVariableArrayType(T, 0, ASM, Quals, Brackets); else T = Context.getIncompleteArrayType(T, ASM, Quals); } else if (ArraySize->isTypeDependent() || ArraySize->isValueDependent()) { T = Context.getDependentSizedArrayType(T, ArraySize, ASM, Quals, Brackets); } else if ((!T->isDependentType() && !T->isIncompleteType() && !T->isConstantSizeType()) || isArraySizeVLA(*this, ArraySize, ConstVal)) { // Even in C++11, don't allow contextual conversions in the array bound // of a VLA. if (getLangOpts().CPlusPlus11 && !ArraySize->getType()->isIntegralOrUnscopedEnumerationType()) { Diag(ArraySize->getLocStart(), diag::err_array_size_non_int) << ArraySize->getType() << ArraySize->getSourceRange(); return QualType(); } // C99: an array with an element type that has a non-constant-size is a VLA. // C99: an array with a non-ICE size is a VLA. We accept any expression // that we can fold to a non-zero positive value as an extension. T = Context.getVariableArrayType(T, ArraySize, ASM, Quals, Brackets); } else { // C99 6.7.5.2p1: If the expression is a constant expression, it shall // have a value greater than zero. if (ConstVal.isSigned() && ConstVal.isNegative()) { if (Entity) Diag(ArraySize->getLocStart(), diag::err_decl_negative_array_size) << getPrintableNameForEntity(Entity) << ArraySize->getSourceRange(); else Diag(ArraySize->getLocStart(), diag::err_typecheck_negative_array_size) << ArraySize->getSourceRange(); return QualType(); } if (ConstVal == 0) { // GCC accepts zero sized static arrays. We allow them when // we're not in a SFINAE context. Diag(ArraySize->getLocStart(), isSFINAEContext()? diag::err_typecheck_zero_array_size : diag::ext_typecheck_zero_array_size) << ArraySize->getSourceRange(); if (ASM == ArrayType::Static) { Diag(ArraySize->getLocStart(), diag::warn_typecheck_zero_static_array_size) << ArraySize->getSourceRange(); ASM = ArrayType::Normal; } } else if (!T->isDependentType() && !T->isVariablyModifiedType() && !T->isIncompleteType()) { // Is the array too large? unsigned ActiveSizeBits = ConstantArrayType::getNumAddressingBits(Context, T, ConstVal); if (ActiveSizeBits > ConstantArrayType::getMaxSizeBits(Context)) Diag(ArraySize->getLocStart(), diag::err_array_too_large) << ConstVal.toString(10) << ArraySize->getSourceRange(); } T = Context.getConstantArrayType(T, ConstVal, ASM, Quals); } // OpenCL v1.2 s6.9.d: variable length arrays are not supported. if (getLangOpts().OpenCL && T->isVariableArrayType()) { Diag(Loc, diag::err_opencl_vla); return QualType(); } // If this is not C99, extwarn about VLA's and C99 array size modifiers. if (!getLangOpts().C99) { if (T->isVariableArrayType()) { // Prohibit the use of non-POD types in VLAs. QualType BaseT = Context.getBaseElementType(T); if (!T->isDependentType() && !BaseT.isPODType(Context) && !BaseT->isObjCLifetimeType()) { Diag(Loc, diag::err_vla_non_pod) << BaseT; return QualType(); } // Prohibit the use of VLAs during template argument deduction. else if (isSFINAEContext()) { Diag(Loc, diag::err_vla_in_sfinae); return QualType(); } // Just extwarn about VLAs. else Diag(Loc, diag::ext_vla); } else if (ASM != ArrayType::Normal || Quals != 0) Diag(Loc, getLangOpts().CPlusPlus? diag::err_c99_array_usage_cxx : diag::ext_c99_array_usage) << ASM; } if (T->isVariableArrayType()) { // Warn about VLAs for -Wvla. Diag(Loc, diag::warn_vla_used); } return T; } /// \brief Build an ext-vector type. /// /// Run the required checks for the extended vector type. QualType Sema::BuildExtVectorType(QualType T, Expr *ArraySize, SourceLocation AttrLoc) { // unlike gcc's vector_size attribute, we do not allow vectors to be defined // in conjunction with complex types (pointers, arrays, functions, etc.). if (!T->isDependentType() && !T->isIntegerType() && !T->isRealFloatingType()) { Diag(AttrLoc, diag::err_attribute_invalid_vector_type) << T; return QualType(); } if (!ArraySize->isTypeDependent() && !ArraySize->isValueDependent()) { llvm::APSInt vecSize(32); if (!ArraySize->isIntegerConstantExpr(vecSize, Context)) { Diag(AttrLoc, diag::err_attribute_argument_not_int) << "ext_vector_type" << ArraySize->getSourceRange(); return QualType(); } // unlike gcc's vector_size attribute, the size is specified as the // number of elements, not the number of bytes. unsigned vectorSize = static_cast(vecSize.getZExtValue()); if (vectorSize == 0) { Diag(AttrLoc, diag::err_attribute_zero_size) << ArraySize->getSourceRange(); return QualType(); } return Context.getExtVectorType(T, vectorSize); } return Context.getDependentSizedExtVectorType(T, ArraySize, AttrLoc); } QualType Sema::BuildFunctionType(QualType T, llvm::MutableArrayRef ParamTypes, SourceLocation Loc, DeclarationName Entity, const FunctionProtoType::ExtProtoInfo &EPI) { if (T->isArrayType() || T->isFunctionType()) { Diag(Loc, diag::err_func_returning_array_function) << T->isFunctionType() << T; return QualType(); } // Functions cannot return half FP. if (T->isHalfType()) { Diag(Loc, diag::err_parameters_retval_cannot_have_fp16_type) << 1 << FixItHint::CreateInsertion(Loc, "*"); return QualType(); } bool Invalid = false; for (unsigned Idx = 0, Cnt = ParamTypes.size(); Idx < Cnt; ++Idx) { // FIXME: Loc is too inprecise here, should use proper locations for args. QualType ParamType = Context.getAdjustedParameterType(ParamTypes[Idx]); if (ParamType->isVoidType()) { Diag(Loc, diag::err_param_with_void_type); Invalid = true; } else if (ParamType->isHalfType()) { // Disallow half FP arguments. Diag(Loc, diag::err_parameters_retval_cannot_have_fp16_type) << 0 << FixItHint::CreateInsertion(Loc, "*"); Invalid = true; } ParamTypes[Idx] = ParamType; } if (Invalid) return QualType(); return Context.getFunctionType(T, ParamTypes, EPI); } /// \brief Build a member pointer type \c T Class::*. /// /// \param T the type to which the member pointer refers. /// \param Class the class type into which the member pointer points. /// \param Loc the location where this type begins /// \param Entity the name of the entity that will have this member pointer type /// /// \returns a member pointer type, if successful, or a NULL type if there was /// an error. QualType Sema::BuildMemberPointerType(QualType T, QualType Class, SourceLocation Loc, DeclarationName Entity) { // Verify that we're not building a pointer to pointer to function with // exception specification. if (CheckDistantExceptionSpec(T)) { Diag(Loc, diag::err_distant_exception_spec); // FIXME: If we're doing this as part of template instantiation, // we should return immediately. // Build the type anyway, but use the canonical type so that the // exception specifiers are stripped off. T = Context.getCanonicalType(T); } // C++ 8.3.3p3: A pointer to member shall not point to ... a member // with reference type, or "cv void." if (T->isReferenceType()) { Diag(Loc, diag::err_illegal_decl_mempointer_to_reference) << (Entity? Entity.getAsString() : "type name") << T; return QualType(); } if (T->isVoidType()) { Diag(Loc, diag::err_illegal_decl_mempointer_to_void) << (Entity? Entity.getAsString() : "type name"); return QualType(); } if (!Class->isDependentType() && !Class->isRecordType()) { Diag(Loc, diag::err_mempointer_in_nonclass_type) << Class; return QualType(); } // C++ allows the class type in a member pointer to be an incomplete type. // In the Microsoft ABI, the size of the member pointer can vary // according to the class type, which means that we really need a // complete type if possible, which means we need to instantiate templates. // // If template instantiation fails or the type is just incomplete, we have to // add an extra slot to the member pointer. Yes, this does cause problems // when passing pointers between TUs that disagree about the size. if (Context.getTargetInfo().getCXXABI().isMicrosoft()) { CXXRecordDecl *RD = Class->getAsCXXRecordDecl(); if (RD && !RD->hasAttr()) { // Lock in the inheritance model on the first use of a member pointer. // Otherwise we may disagree about the size at different points in the TU. // FIXME: MSVC picks a model on the first use that needs to know the size, // rather than on the first mention of the type, e.g. typedefs. if (RequireCompleteType(Loc, Class, 0) && !RD->isBeingDefined()) { // We know it doesn't have an attribute and it's incomplete, so use the // unspecified inheritance model. If we're in the record body, we can // figure out the inheritance model. for (CXXRecordDecl::redecl_iterator I = RD->redecls_begin(), E = RD->redecls_end(); I != E; ++I) { I->addAttr(::new (Context) UnspecifiedInheritanceAttr( RD->getSourceRange(), Context)); } } } } return Context.getMemberPointerType(T, Class.getTypePtr()); } /// \brief Build a block pointer type. /// /// \param T The type to which we'll be building a block pointer. /// /// \param Loc The source location, used for diagnostics. /// /// \param Entity The name of the entity that involves the block pointer /// type, if known. /// /// \returns A suitable block pointer type, if there are no /// errors. Otherwise, returns a NULL type. QualType Sema::BuildBlockPointerType(QualType T, SourceLocation Loc, DeclarationName Entity) { if (!T->isFunctionType()) { Diag(Loc, diag::err_nonfunction_block_type); return QualType(); } return Context.getBlockPointerType(T); } QualType Sema::GetTypeFromParser(ParsedType Ty, TypeSourceInfo **TInfo) { QualType QT = Ty.get(); if (QT.isNull()) { if (TInfo) *TInfo = 0; return QualType(); } TypeSourceInfo *DI = 0; if (const LocInfoType *LIT = dyn_cast(QT)) { QT = LIT->getType(); DI = LIT->getTypeSourceInfo(); } if (TInfo) *TInfo = DI; return QT; } static void transferARCOwnershipToDeclaratorChunk(TypeProcessingState &state, Qualifiers::ObjCLifetime ownership, unsigned chunkIndex); /// Given that this is the declaration of a parameter under ARC, /// attempt to infer attributes and such for pointer-to-whatever /// types. static void inferARCWriteback(TypeProcessingState &state, QualType &declSpecType) { Sema &S = state.getSema(); Declarator &declarator = state.getDeclarator(); // TODO: should we care about decl qualifiers? // Check whether the declarator has the expected form. We walk // from the inside out in order to make the block logic work. unsigned outermostPointerIndex = 0; bool isBlockPointer = false; unsigned numPointers = 0; for (unsigned i = 0, e = declarator.getNumTypeObjects(); i != e; ++i) { unsigned chunkIndex = i; DeclaratorChunk &chunk = declarator.getTypeObject(chunkIndex); switch (chunk.Kind) { case DeclaratorChunk::Paren: // Ignore parens. break; case DeclaratorChunk::Reference: case DeclaratorChunk::Pointer: // Count the number of pointers. Treat references // interchangeably as pointers; if they're mis-ordered, normal // type building will discover that. outermostPointerIndex = chunkIndex; numPointers++; break; case DeclaratorChunk::BlockPointer: // If we have a pointer to block pointer, that's an acceptable // indirect reference; anything else is not an application of // the rules. if (numPointers != 1) return; numPointers++; outermostPointerIndex = chunkIndex; isBlockPointer = true; // We don't care about pointer structure in return values here. goto done; case DeclaratorChunk::Array: // suppress if written (id[])? case DeclaratorChunk::Function: case DeclaratorChunk::MemberPointer: return; } } done: // If we have *one* pointer, then we want to throw the qualifier on // the declaration-specifiers, which means that it needs to be a // retainable object type. if (numPointers == 1) { // If it's not a retainable object type, the rule doesn't apply. if (!declSpecType->isObjCRetainableType()) return; // If it already has lifetime, don't do anything. if (declSpecType.getObjCLifetime()) return; // Otherwise, modify the type in-place. Qualifiers qs; if (declSpecType->isObjCARCImplicitlyUnretainedType()) qs.addObjCLifetime(Qualifiers::OCL_ExplicitNone); else qs.addObjCLifetime(Qualifiers::OCL_Autoreleasing); declSpecType = S.Context.getQualifiedType(declSpecType, qs); // If we have *two* pointers, then we want to throw the qualifier on // the outermost pointer. } else if (numPointers == 2) { // If we don't have a block pointer, we need to check whether the // declaration-specifiers gave us something that will turn into a // retainable object pointer after we slap the first pointer on it. if (!isBlockPointer && !declSpecType->isObjCObjectType()) return; // Look for an explicit lifetime attribute there. DeclaratorChunk &chunk = declarator.getTypeObject(outermostPointerIndex); if (chunk.Kind != DeclaratorChunk::Pointer && chunk.Kind != DeclaratorChunk::BlockPointer) return; for (const AttributeList *attr = chunk.getAttrs(); attr; attr = attr->getNext()) if (attr->getKind() == AttributeList::AT_ObjCOwnership) return; transferARCOwnershipToDeclaratorChunk(state, Qualifiers::OCL_Autoreleasing, outermostPointerIndex); // Any other number of pointers/references does not trigger the rule. } else return; // TODO: mark whether we did this inference? } static void diagnoseIgnoredQualifiers( Sema &S, unsigned Quals, SourceLocation FallbackLoc, SourceLocation ConstQualLoc = SourceLocation(), SourceLocation VolatileQualLoc = SourceLocation(), SourceLocation RestrictQualLoc = SourceLocation(), SourceLocation AtomicQualLoc = SourceLocation()) { if (!Quals) return; const SourceManager &SM = S.getSourceManager(); struct Qual { unsigned Mask; const char *Name; SourceLocation Loc; } const QualKinds[4] = { { DeclSpec::TQ_const, "const", ConstQualLoc }, { DeclSpec::TQ_volatile, "volatile", VolatileQualLoc }, { DeclSpec::TQ_restrict, "restrict", RestrictQualLoc }, { DeclSpec::TQ_atomic, "_Atomic", AtomicQualLoc } }; llvm::SmallString<32> QualStr; unsigned NumQuals = 0; SourceLocation Loc; FixItHint FixIts[4]; // Build a string naming the redundant qualifiers. for (unsigned I = 0; I != 4; ++I) { if (Quals & QualKinds[I].Mask) { if (!QualStr.empty()) QualStr += ' '; QualStr += QualKinds[I].Name; // If we have a location for the qualifier, offer a fixit. SourceLocation QualLoc = QualKinds[I].Loc; if (!QualLoc.isInvalid()) { FixIts[NumQuals] = FixItHint::CreateRemoval(QualLoc); if (Loc.isInvalid() || SM.isBeforeInTranslationUnit(QualLoc, Loc)) Loc = QualLoc; } ++NumQuals; } } S.Diag(Loc.isInvalid() ? FallbackLoc : Loc, diag::warn_qual_return_type) << QualStr << NumQuals << FixIts[0] << FixIts[1] << FixIts[2] << FixIts[3]; } // Diagnose pointless type qualifiers on the return type of a function. static void diagnoseIgnoredFunctionQualifiers(Sema &S, QualType RetTy, Declarator &D, unsigned FunctionChunkIndex) { if (D.getTypeObject(FunctionChunkIndex).Fun.hasTrailingReturnType()) { // FIXME: TypeSourceInfo doesn't preserve location information for // qualifiers. diagnoseIgnoredQualifiers(S, RetTy.getLocalCVRQualifiers(), D.getIdentifierLoc()); return; } for (unsigned OuterChunkIndex = FunctionChunkIndex + 1, End = D.getNumTypeObjects(); OuterChunkIndex != End; ++OuterChunkIndex) { DeclaratorChunk &OuterChunk = D.getTypeObject(OuterChunkIndex); switch (OuterChunk.Kind) { case DeclaratorChunk::Paren: continue; case DeclaratorChunk::Pointer: { DeclaratorChunk::PointerTypeInfo &PTI = OuterChunk.Ptr; diagnoseIgnoredQualifiers( S, PTI.TypeQuals, SourceLocation(), SourceLocation::getFromRawEncoding(PTI.ConstQualLoc), SourceLocation::getFromRawEncoding(PTI.VolatileQualLoc), SourceLocation::getFromRawEncoding(PTI.RestrictQualLoc), SourceLocation::getFromRawEncoding(PTI.AtomicQualLoc)); return; } case DeclaratorChunk::Function: case DeclaratorChunk::BlockPointer: case DeclaratorChunk::Reference: case DeclaratorChunk::Array: case DeclaratorChunk::MemberPointer: // FIXME: We can't currently provide an accurate source location and a // fix-it hint for these. unsigned AtomicQual = RetTy->isAtomicType() ? DeclSpec::TQ_atomic : 0; diagnoseIgnoredQualifiers(S, RetTy.getCVRQualifiers() | AtomicQual, D.getIdentifierLoc()); return; } llvm_unreachable("unknown declarator chunk kind"); } // If the qualifiers come from a conversion function type, don't diagnose // them -- they're not necessarily redundant, since such a conversion // operator can be explicitly called as "x.operator const int()". if (D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) return; // Just parens all the way out to the decl specifiers. Diagnose any qualifiers // which are present there. diagnoseIgnoredQualifiers(S, D.getDeclSpec().getTypeQualifiers(), D.getIdentifierLoc(), D.getDeclSpec().getConstSpecLoc(), D.getDeclSpec().getVolatileSpecLoc(), D.getDeclSpec().getRestrictSpecLoc(), D.getDeclSpec().getAtomicSpecLoc()); } static QualType GetDeclSpecTypeForDeclarator(TypeProcessingState &state, TypeSourceInfo *&ReturnTypeInfo) { Sema &SemaRef = state.getSema(); Declarator &D = state.getDeclarator(); QualType T; ReturnTypeInfo = 0; // The TagDecl owned by the DeclSpec. TagDecl *OwnedTagDecl = 0; switch (D.getName().getKind()) { case UnqualifiedId::IK_ImplicitSelfParam: case UnqualifiedId::IK_OperatorFunctionId: case UnqualifiedId::IK_Identifier: case UnqualifiedId::IK_LiteralOperatorId: case UnqualifiedId::IK_TemplateId: T = ConvertDeclSpecToType(state); if (!D.isInvalidType() && D.getDeclSpec().isTypeSpecOwned()) { OwnedTagDecl = cast(D.getDeclSpec().getRepAsDecl()); // Owned declaration is embedded in declarator. OwnedTagDecl->setEmbeddedInDeclarator(true); } break; case UnqualifiedId::IK_ConstructorName: case UnqualifiedId::IK_ConstructorTemplateId: case UnqualifiedId::IK_DestructorName: // Constructors and destructors don't have return types. Use // "void" instead. T = SemaRef.Context.VoidTy; if (AttributeList *attrs = D.getDeclSpec().getAttributes().getList()) processTypeAttrs(state, T, TAL_DeclSpec, attrs); break; case UnqualifiedId::IK_ConversionFunctionId: // The result type of a conversion function is the type that it // converts to. T = SemaRef.GetTypeFromParser(D.getName().ConversionFunctionId, &ReturnTypeInfo); break; } if (D.getAttributes()) distributeTypeAttrsFromDeclarator(state, T); // C++11 [dcl.spec.auto]p5: reject 'auto' if it is not in an allowed context. // In C++11, a function declarator using 'auto' must have a trailing return // type (this is checked later) and we can skip this. In other languages // using auto, we need to check regardless. if (D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_auto && (!SemaRef.getLangOpts().CPlusPlus11 || !D.isFunctionDeclarator())) { int Error = -1; switch (D.getContext()) { case Declarator::KNRTypeListContext: llvm_unreachable("K&R type lists aren't allowed in C++"); case Declarator::LambdaExprContext: llvm_unreachable("Can't specify a type specifier in lambda grammar"); case Declarator::ObjCParameterContext: case Declarator::ObjCResultContext: case Declarator::PrototypeContext: Error = 0; // Function prototype break; case Declarator::MemberContext: if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_static) break; switch (cast(SemaRef.CurContext)->getTagKind()) { case TTK_Enum: llvm_unreachable("unhandled tag kind"); case TTK_Struct: Error = 1; /* Struct member */ break; case TTK_Union: Error = 2; /* Union member */ break; case TTK_Class: Error = 3; /* Class member */ break; case TTK_Interface: Error = 4; /* Interface member */ break; } break; case Declarator::CXXCatchContext: case Declarator::ObjCCatchContext: Error = 5; // Exception declaration break; case Declarator::TemplateParamContext: Error = 6; // Template parameter break; case Declarator::BlockLiteralContext: Error = 7; // Block literal break; case Declarator::TemplateTypeArgContext: Error = 8; // Template type argument break; case Declarator::AliasDeclContext: case Declarator::AliasTemplateContext: Error = 10; // Type alias break; case Declarator::TrailingReturnContext: Error = 11; // Function return type break; case Declarator::TypeNameContext: Error = 12; // Generic break; case Declarator::FileContext: case Declarator::BlockContext: case Declarator::ForContext: case Declarator::ConditionContext: case Declarator::CXXNewContext: break; } if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) Error = 9; // In Objective-C it is an error to use 'auto' on a function declarator. if (D.isFunctionDeclarator()) Error = 11; // C++11 [dcl.spec.auto]p2: 'auto' is always fine if the declarator // contains a trailing return type. That is only legal at the outermost // level. Check all declarator chunks (outermost first) anyway, to give // better diagnostics. if (SemaRef.getLangOpts().CPlusPlus11 && Error != -1) { for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { unsigned chunkIndex = e - i - 1; state.setCurrentChunkIndex(chunkIndex); DeclaratorChunk &DeclType = D.getTypeObject(chunkIndex); if (DeclType.Kind == DeclaratorChunk::Function) { const DeclaratorChunk::FunctionTypeInfo &FTI = DeclType.Fun; if (FTI.hasTrailingReturnType()) { Error = -1; break; } } } } if (Error != -1) { SemaRef.Diag(D.getDeclSpec().getTypeSpecTypeLoc(), diag::err_auto_not_allowed) << Error; T = SemaRef.Context.IntTy; D.setInvalidType(true); } else SemaRef.Diag(D.getDeclSpec().getTypeSpecTypeLoc(), diag::warn_cxx98_compat_auto_type_specifier); } if (SemaRef.getLangOpts().CPlusPlus && OwnedTagDecl && OwnedTagDecl->isCompleteDefinition()) { // Check the contexts where C++ forbids the declaration of a new class // or enumeration in a type-specifier-seq. switch (D.getContext()) { case Declarator::TrailingReturnContext: // Class and enumeration definitions are syntactically not allowed in // trailing return types. llvm_unreachable("parser should not have allowed this"); break; case Declarator::FileContext: case Declarator::MemberContext: case Declarator::BlockContext: case Declarator::ForContext: case Declarator::BlockLiteralContext: case Declarator::LambdaExprContext: // C++11 [dcl.type]p3: // A type-specifier-seq shall not define a class or enumeration unless // it appears in the type-id of an alias-declaration (7.1.3) that is not // the declaration of a template-declaration. case Declarator::AliasDeclContext: break; case Declarator::AliasTemplateContext: SemaRef.Diag(OwnedTagDecl->getLocation(), diag::err_type_defined_in_alias_template) << SemaRef.Context.getTypeDeclType(OwnedTagDecl); D.setInvalidType(true); break; case Declarator::TypeNameContext: case Declarator::TemplateParamContext: case Declarator::CXXNewContext: case Declarator::CXXCatchContext: case Declarator::ObjCCatchContext: case Declarator::TemplateTypeArgContext: SemaRef.Diag(OwnedTagDecl->getLocation(), diag::err_type_defined_in_type_specifier) << SemaRef.Context.getTypeDeclType(OwnedTagDecl); D.setInvalidType(true); break; case Declarator::PrototypeContext: case Declarator::ObjCParameterContext: case Declarator::ObjCResultContext: case Declarator::KNRTypeListContext: // C++ [dcl.fct]p6: // Types shall not be defined in return or parameter types. SemaRef.Diag(OwnedTagDecl->getLocation(), diag::err_type_defined_in_param_type) << SemaRef.Context.getTypeDeclType(OwnedTagDecl); D.setInvalidType(true); break; case Declarator::ConditionContext: // C++ 6.4p2: // The type-specifier-seq shall not contain typedef and shall not declare // a new class or enumeration. SemaRef.Diag(OwnedTagDecl->getLocation(), diag::err_type_defined_in_condition); D.setInvalidType(true); break; } } return T; } static std::string getFunctionQualifiersAsString(const FunctionProtoType *FnTy){ std::string Quals = Qualifiers::fromCVRMask(FnTy->getTypeQuals()).getAsString(); switch (FnTy->getRefQualifier()) { case RQ_None: break; case RQ_LValue: if (!Quals.empty()) Quals += ' '; Quals += '&'; break; case RQ_RValue: if (!Quals.empty()) Quals += ' '; Quals += "&&"; break; } return Quals; } /// Check that the function type T, which has a cv-qualifier or a ref-qualifier, /// can be contained within the declarator chunk DeclType, and produce an /// appropriate diagnostic if not. static void checkQualifiedFunction(Sema &S, QualType T, DeclaratorChunk &DeclType) { // C++98 [dcl.fct]p4 / C++11 [dcl.fct]p6: a function type with a // cv-qualifier or a ref-qualifier can only appear at the topmost level // of a type. int DiagKind = -1; switch (DeclType.Kind) { case DeclaratorChunk::Paren: case DeclaratorChunk::MemberPointer: // These cases are permitted. return; case DeclaratorChunk::Array: case DeclaratorChunk::Function: // These cases don't allow function types at all; no need to diagnose the // qualifiers separately. return; case DeclaratorChunk::BlockPointer: DiagKind = 0; break; case DeclaratorChunk::Pointer: DiagKind = 1; break; case DeclaratorChunk::Reference: DiagKind = 2; break; } assert(DiagKind != -1); S.Diag(DeclType.Loc, diag::err_compound_qualified_function_type) << DiagKind << isa(T.IgnoreParens()) << T << getFunctionQualifiersAsString(T->castAs()); } /// Produce an approprioate diagnostic for an ambiguity between a function /// declarator and a C++ direct-initializer. static void warnAboutAmbiguousFunction(Sema &S, Declarator &D, DeclaratorChunk &DeclType, QualType RT) { const DeclaratorChunk::FunctionTypeInfo &FTI = DeclType.Fun; assert(FTI.isAmbiguous && "no direct-initializer / function ambiguity"); // If the return type is void there is no ambiguity. if (RT->isVoidType()) return; // An initializer for a non-class type can have at most one argument. if (!RT->isRecordType() && FTI.NumArgs > 1) return; // An initializer for a reference must have exactly one argument. if (RT->isReferenceType() && FTI.NumArgs != 1) return; // Only warn if this declarator is declaring a function at block scope, and // doesn't have a storage class (such as 'extern') specified. if (!D.isFunctionDeclarator() || D.getFunctionDefinitionKind() != FDK_Declaration || !S.CurContext->isFunctionOrMethod() || D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_unspecified) return; // Inside a condition, a direct initializer is not permitted. We allow one to // be parsed in order to give better diagnostics in condition parsing. if (D.getContext() == Declarator::ConditionContext) return; SourceRange ParenRange(DeclType.Loc, DeclType.EndLoc); S.Diag(DeclType.Loc, FTI.NumArgs ? diag::warn_parens_disambiguated_as_function_declaration : diag::warn_empty_parens_are_function_decl) << ParenRange; // If the declaration looks like: // T var1, // f(); // and name lookup finds a function named 'f', then the ',' was // probably intended to be a ';'. if (!D.isFirstDeclarator() && D.getIdentifier()) { FullSourceLoc Comma(D.getCommaLoc(), S.SourceMgr); FullSourceLoc Name(D.getIdentifierLoc(), S.SourceMgr); if (Comma.getFileID() != Name.getFileID() || Comma.getSpellingLineNumber() != Name.getSpellingLineNumber()) { LookupResult Result(S, D.getIdentifier(), SourceLocation(), Sema::LookupOrdinaryName); if (S.LookupName(Result, S.getCurScope())) S.Diag(D.getCommaLoc(), diag::note_empty_parens_function_call) << FixItHint::CreateReplacement(D.getCommaLoc(), ";") << D.getIdentifier(); } } if (FTI.NumArgs > 0) { // For a declaration with parameters, eg. "T var(T());", suggest adding parens // around the first parameter to turn the declaration into a variable // declaration. SourceRange Range = FTI.ArgInfo[0].Param->getSourceRange(); SourceLocation B = Range.getBegin(); SourceLocation E = S.PP.getLocForEndOfToken(Range.getEnd()); // FIXME: Maybe we should suggest adding braces instead of parens // in C++11 for classes that don't have an initializer_list constructor. S.Diag(B, diag::note_additional_parens_for_variable_declaration) << FixItHint::CreateInsertion(B, "(") << FixItHint::CreateInsertion(E, ")"); } else { // For a declaration without parameters, eg. "T var();", suggest replacing the // parens with an initializer to turn the declaration into a variable // declaration. const CXXRecordDecl *RD = RT->getAsCXXRecordDecl(); // Empty parens mean value-initialization, and no parens mean // default initialization. These are equivalent if the default // constructor is user-provided or if zero-initialization is a // no-op. if (RD && RD->hasDefinition() && (RD->isEmpty() || RD->hasUserProvidedDefaultConstructor())) S.Diag(DeclType.Loc, diag::note_empty_parens_default_ctor) << FixItHint::CreateRemoval(ParenRange); else { std::string Init = S.getFixItZeroInitializerForType(RT); if (Init.empty() && S.LangOpts.CPlusPlus11) Init = "{}"; if (!Init.empty()) S.Diag(DeclType.Loc, diag::note_empty_parens_zero_initialize) << FixItHint::CreateReplacement(ParenRange, Init); } } } static TypeSourceInfo *GetFullTypeForDeclarator(TypeProcessingState &state, QualType declSpecType, TypeSourceInfo *TInfo) { QualType T = declSpecType; Declarator &D = state.getDeclarator(); Sema &S = state.getSema(); ASTContext &Context = S.Context; const LangOptions &LangOpts = S.getLangOpts(); // The name we're declaring, if any. DeclarationName Name; if (D.getIdentifier()) Name = D.getIdentifier(); // Does this declaration declare a typedef-name? bool IsTypedefName = D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef || D.getContext() == Declarator::AliasDeclContext || D.getContext() == Declarator::AliasTemplateContext; // Does T refer to a function type with a cv-qualifier or a ref-qualifier? bool IsQualifiedFunction = T->isFunctionProtoType() && (T->castAs()->getTypeQuals() != 0 || T->castAs()->getRefQualifier() != RQ_None); // Walk the DeclTypeInfo, building the recursive type as we go. // DeclTypeInfos are ordered from the identifier out, which is // opposite of what we want :). for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { unsigned chunkIndex = e - i - 1; state.setCurrentChunkIndex(chunkIndex); DeclaratorChunk &DeclType = D.getTypeObject(chunkIndex); if (IsQualifiedFunction) { checkQualifiedFunction(S, T, DeclType); IsQualifiedFunction = DeclType.Kind == DeclaratorChunk::Paren; } switch (DeclType.Kind) { case DeclaratorChunk::Paren: T = S.BuildParenType(T); break; case DeclaratorChunk::BlockPointer: // If blocks are disabled, emit an error. if (!LangOpts.Blocks) S.Diag(DeclType.Loc, diag::err_blocks_disable); T = S.BuildBlockPointerType(T, D.getIdentifierLoc(), Name); if (DeclType.Cls.TypeQuals) T = S.BuildQualifiedType(T, DeclType.Loc, DeclType.Cls.TypeQuals); break; case DeclaratorChunk::Pointer: // Verify that we're not building a pointer to pointer to function with // exception specification. if (LangOpts.CPlusPlus && S.CheckDistantExceptionSpec(T)) { S.Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec); D.setInvalidType(true); // Build the type anyway. } if (LangOpts.ObjC1 && T->getAs()) { T = Context.getObjCObjectPointerType(T); if (DeclType.Ptr.TypeQuals) T = S.BuildQualifiedType(T, DeclType.Loc, DeclType.Ptr.TypeQuals); break; } T = S.BuildPointerType(T, DeclType.Loc, Name); if (DeclType.Ptr.TypeQuals) T = S.BuildQualifiedType(T, DeclType.Loc, DeclType.Ptr.TypeQuals); break; case DeclaratorChunk::Reference: { // Verify that we're not building a reference to pointer to function with // exception specification. if (LangOpts.CPlusPlus && S.CheckDistantExceptionSpec(T)) { S.Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec); D.setInvalidType(true); // Build the type anyway. } T = S.BuildReferenceType(T, DeclType.Ref.LValueRef, DeclType.Loc, Name); Qualifiers Quals; if (DeclType.Ref.HasRestrict) T = S.BuildQualifiedType(T, DeclType.Loc, Qualifiers::Restrict); break; } case DeclaratorChunk::Array: { // Verify that we're not building an array of pointers to function with // exception specification. if (LangOpts.CPlusPlus && S.CheckDistantExceptionSpec(T)) { S.Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec); D.setInvalidType(true); // Build the type anyway. } DeclaratorChunk::ArrayTypeInfo &ATI = DeclType.Arr; Expr *ArraySize = static_cast(ATI.NumElts); ArrayType::ArraySizeModifier ASM; if (ATI.isStar) ASM = ArrayType::Star; else if (ATI.hasStatic) ASM = ArrayType::Static; else ASM = ArrayType::Normal; if (ASM == ArrayType::Star && !D.isPrototypeContext()) { // FIXME: This check isn't quite right: it allows star in prototypes // for function definitions, and disallows some edge cases detailed // in http://gcc.gnu.org/ml/gcc-patches/2009-02/msg00133.html S.Diag(DeclType.Loc, diag::err_array_star_outside_prototype); ASM = ArrayType::Normal; D.setInvalidType(true); } // C99 6.7.5.2p1: The optional type qualifiers and the keyword static // shall appear only in a declaration of a function parameter with an // array type, ... if (ASM == ArrayType::Static || ATI.TypeQuals) { if (!(D.isPrototypeContext() || D.getContext() == Declarator::KNRTypeListContext)) { S.Diag(DeclType.Loc, diag::err_array_static_outside_prototype) << (ASM == ArrayType::Static ? "'static'" : "type qualifier"); // Remove the 'static' and the type qualifiers. if (ASM == ArrayType::Static) ASM = ArrayType::Normal; ATI.TypeQuals = 0; D.setInvalidType(true); } // C99 6.7.5.2p1: ... and then only in the outermost array type // derivation. unsigned x = chunkIndex; while (x != 0) { // Walk outwards along the declarator chunks. x--; const DeclaratorChunk &DC = D.getTypeObject(x); switch (DC.Kind) { case DeclaratorChunk::Paren: continue; case DeclaratorChunk::Array: case DeclaratorChunk::Pointer: case DeclaratorChunk::Reference: case DeclaratorChunk::MemberPointer: S.Diag(DeclType.Loc, diag::err_array_static_not_outermost) << (ASM == ArrayType::Static ? "'static'" : "type qualifier"); if (ASM == ArrayType::Static) ASM = ArrayType::Normal; ATI.TypeQuals = 0; D.setInvalidType(true); break; case DeclaratorChunk::Function: case DeclaratorChunk::BlockPointer: // These are invalid anyway, so just ignore. break; } } } T = S.BuildArrayType(T, ASM, ArraySize, ATI.TypeQuals, SourceRange(DeclType.Loc, DeclType.EndLoc), Name); break; } case DeclaratorChunk::Function: { // If the function declarator has a prototype (i.e. it is not () and // does not have a K&R-style identifier list), then the arguments are part // of the type, otherwise the argument list is (). const DeclaratorChunk::FunctionTypeInfo &FTI = DeclType.Fun; IsQualifiedFunction = FTI.TypeQuals || FTI.hasRefQualifier(); // Check for auto functions and trailing return type and adjust the // return type accordingly. if (!D.isInvalidType()) { // trailing-return-type is only required if we're declaring a function, // and not, for instance, a pointer to a function. if (D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_auto && !FTI.hasTrailingReturnType() && chunkIndex == 0) { S.Diag(D.getDeclSpec().getTypeSpecTypeLoc(), diag::err_auto_missing_trailing_return); T = Context.IntTy; D.setInvalidType(true); } else if (FTI.hasTrailingReturnType()) { // T must be exactly 'auto' at this point. See CWG issue 681. if (isa(T)) { S.Diag(D.getDeclSpec().getTypeSpecTypeLoc(), diag::err_trailing_return_in_parens) << T << D.getDeclSpec().getSourceRange(); D.setInvalidType(true); } else if (D.getContext() != Declarator::LambdaExprContext && (T.hasQualifiers() || !isa(T))) { S.Diag(D.getDeclSpec().getTypeSpecTypeLoc(), diag::err_trailing_return_without_auto) << T << D.getDeclSpec().getSourceRange(); D.setInvalidType(true); } T = S.GetTypeFromParser(FTI.getTrailingReturnType(), &TInfo); if (T.isNull()) { // An error occurred parsing the trailing return type. T = Context.IntTy; D.setInvalidType(true); } } } // C99 6.7.5.3p1: The return type may not be a function or array type. // For conversion functions, we'll diagnose this particular error later. if ((T->isArrayType() || T->isFunctionType()) && (D.getName().getKind() != UnqualifiedId::IK_ConversionFunctionId)) { unsigned diagID = diag::err_func_returning_array_function; // Last processing chunk in block context means this function chunk // represents the block. if (chunkIndex == 0 && D.getContext() == Declarator::BlockLiteralContext) diagID = diag::err_block_returning_array_function; S.Diag(DeclType.Loc, diagID) << T->isFunctionType() << T; T = Context.IntTy; D.setInvalidType(true); } // Do not allow returning half FP value. // FIXME: This really should be in BuildFunctionType. if (T->isHalfType()) { if (S.getLangOpts().OpenCL) { if (!S.getOpenCLOptions().cl_khr_fp16) { S.Diag(D.getIdentifierLoc(), diag::err_opencl_half_return) << T; D.setInvalidType(true); } } else { S.Diag(D.getIdentifierLoc(), diag::err_parameters_retval_cannot_have_fp16_type) << 1; D.setInvalidType(true); } } // cv-qualifiers on return types are pointless except when the type is a // class type in C++. if ((T.getCVRQualifiers() || T->isAtomicType()) && !(S.getLangOpts().CPlusPlus && (T->isDependentType() || T->isRecordType()))) diagnoseIgnoredFunctionQualifiers(S, T, D, chunkIndex); // Objective-C ARC ownership qualifiers are ignored on the function // return type (by type canonicalization). Complain if this attribute // was written here. if (T.getQualifiers().hasObjCLifetime()) { SourceLocation AttrLoc; if (chunkIndex + 1 < D.getNumTypeObjects()) { DeclaratorChunk ReturnTypeChunk = D.getTypeObject(chunkIndex + 1); for (const AttributeList *Attr = ReturnTypeChunk.getAttrs(); Attr; Attr = Attr->getNext()) { if (Attr->getKind() == AttributeList::AT_ObjCOwnership) { AttrLoc = Attr->getLoc(); break; } } } if (AttrLoc.isInvalid()) { for (const AttributeList *Attr = D.getDeclSpec().getAttributes().getList(); Attr; Attr = Attr->getNext()) { if (Attr->getKind() == AttributeList::AT_ObjCOwnership) { AttrLoc = Attr->getLoc(); break; } } } if (AttrLoc.isValid()) { // The ownership attributes are almost always written via // the predefined // __strong/__weak/__autoreleasing/__unsafe_unretained. if (AttrLoc.isMacroID()) AttrLoc = S.SourceMgr.getImmediateExpansionRange(AttrLoc).first; S.Diag(AttrLoc, diag::warn_arc_lifetime_result_type) << T.getQualifiers().getObjCLifetime(); } } if (LangOpts.CPlusPlus && D.getDeclSpec().isTypeSpecOwned()) { // C++ [dcl.fct]p6: // Types shall not be defined in return or parameter types. TagDecl *Tag = cast(D.getDeclSpec().getRepAsDecl()); if (Tag->isCompleteDefinition()) S.Diag(Tag->getLocation(), diag::err_type_defined_in_result_type) << Context.getTypeDeclType(Tag); } // Exception specs are not allowed in typedefs. Complain, but add it // anyway. if (IsTypedefName && FTI.getExceptionSpecType()) S.Diag(FTI.getExceptionSpecLoc(), diag::err_exception_spec_in_typedef) << (D.getContext() == Declarator::AliasDeclContext || D.getContext() == Declarator::AliasTemplateContext); // If we see "T var();" or "T var(T());" at block scope, it is probably // an attempt to initialize a variable, not a function declaration. if (FTI.isAmbiguous) warnAboutAmbiguousFunction(S, D, DeclType, T); if (!FTI.NumArgs && !FTI.isVariadic && !LangOpts.CPlusPlus) { // Simple void foo(), where the incoming T is the result type. T = Context.getFunctionNoProtoType(T); } else { // We allow a zero-parameter variadic function in C if the // function is marked with the "overloadable" attribute. Scan // for this attribute now. if (!FTI.NumArgs && FTI.isVariadic && !LangOpts.CPlusPlus) { bool Overloadable = false; for (const AttributeList *Attrs = D.getAttributes(); Attrs; Attrs = Attrs->getNext()) { if (Attrs->getKind() == AttributeList::AT_Overloadable) { Overloadable = true; break; } } if (!Overloadable) S.Diag(FTI.getEllipsisLoc(), diag::err_ellipsis_first_arg); } if (FTI.NumArgs && FTI.ArgInfo[0].Param == 0) { // C99 6.7.5.3p3: Reject int(x,y,z) when it's not a function // definition. S.Diag(FTI.ArgInfo[0].IdentLoc, diag::err_ident_list_in_fn_declaration); D.setInvalidType(true); // Recover by creating a K&R-style function type. T = Context.getFunctionNoProtoType(T); break; } FunctionProtoType::ExtProtoInfo EPI; EPI.Variadic = FTI.isVariadic; EPI.HasTrailingReturn = FTI.hasTrailingReturnType(); EPI.TypeQuals = FTI.TypeQuals; EPI.RefQualifier = !FTI.hasRefQualifier()? RQ_None : FTI.RefQualifierIsLValueRef? RQ_LValue : RQ_RValue; // Otherwise, we have a function with an argument list that is // potentially variadic. SmallVector ArgTys; ArgTys.reserve(FTI.NumArgs); SmallVector ConsumedArguments; ConsumedArguments.reserve(FTI.NumArgs); bool HasAnyConsumedArguments = false; for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { ParmVarDecl *Param = cast(FTI.ArgInfo[i].Param); QualType ArgTy = Param->getType(); assert(!ArgTy.isNull() && "Couldn't parse type?"); // Adjust the parameter type. assert((ArgTy == Context.getAdjustedParameterType(ArgTy)) && "Unadjusted type?"); // Look for 'void'. void is allowed only as a single argument to a // function with no other parameters (C99 6.7.5.3p10). We record // int(void) as a FunctionProtoType with an empty argument list. if (ArgTy->isVoidType()) { // If this is something like 'float(int, void)', reject it. 'void' // is an incomplete type (C99 6.2.5p19) and function decls cannot // have arguments of incomplete type. if (FTI.NumArgs != 1 || FTI.isVariadic) { S.Diag(DeclType.Loc, diag::err_void_only_param); ArgTy = Context.IntTy; Param->setType(ArgTy); } else if (FTI.ArgInfo[i].Ident) { // Reject, but continue to parse 'int(void abc)'. S.Diag(FTI.ArgInfo[i].IdentLoc, diag::err_param_with_void_type); ArgTy = Context.IntTy; Param->setType(ArgTy); } else { // Reject, but continue to parse 'float(const void)'. if (ArgTy.hasQualifiers()) S.Diag(DeclType.Loc, diag::err_void_param_qualified); // Do not add 'void' to the ArgTys list. break; } } else if (ArgTy->isHalfType()) { // Disallow half FP arguments. // FIXME: This really should be in BuildFunctionType. if (S.getLangOpts().OpenCL) { if (!S.getOpenCLOptions().cl_khr_fp16) { S.Diag(Param->getLocation(), diag::err_opencl_half_argument) << ArgTy; D.setInvalidType(); Param->setInvalidDecl(); } } else { S.Diag(Param->getLocation(), diag::err_parameters_retval_cannot_have_fp16_type) << 0; D.setInvalidType(); } } else if (!FTI.hasPrototype) { if (ArgTy->isPromotableIntegerType()) { ArgTy = Context.getPromotedIntegerType(ArgTy); Param->setKNRPromoted(true); } else if (const BuiltinType* BTy = ArgTy->getAs()) { if (BTy->getKind() == BuiltinType::Float) { ArgTy = Context.DoubleTy; Param->setKNRPromoted(true); } } } if (LangOpts.ObjCAutoRefCount) { bool Consumed = Param->hasAttr(); ConsumedArguments.push_back(Consumed); HasAnyConsumedArguments |= Consumed; } ArgTys.push_back(ArgTy); } if (HasAnyConsumedArguments) EPI.ConsumedArguments = ConsumedArguments.data(); SmallVector Exceptions; SmallVector DynamicExceptions; SmallVector DynamicExceptionRanges; Expr *NoexceptExpr = 0; if (FTI.getExceptionSpecType() == EST_Dynamic) { // FIXME: It's rather inefficient to have to split into two vectors // here. unsigned N = FTI.NumExceptions; DynamicExceptions.reserve(N); DynamicExceptionRanges.reserve(N); for (unsigned I = 0; I != N; ++I) { DynamicExceptions.push_back(FTI.Exceptions[I].Ty); DynamicExceptionRanges.push_back(FTI.Exceptions[I].Range); } } else if (FTI.getExceptionSpecType() == EST_ComputedNoexcept) { NoexceptExpr = FTI.NoexceptExpr; } S.checkExceptionSpecification(FTI.getExceptionSpecType(), DynamicExceptions, DynamicExceptionRanges, NoexceptExpr, Exceptions, EPI); T = Context.getFunctionType(T, ArgTys, EPI); } break; } case DeclaratorChunk::MemberPointer: // The scope spec must refer to a class, or be dependent. CXXScopeSpec &SS = DeclType.Mem.Scope(); QualType ClsType; if (SS.isInvalid()) { // Avoid emitting extra errors if we already errored on the scope. D.setInvalidType(true); } else if (S.isDependentScopeSpecifier(SS) || dyn_cast_or_null(S.computeDeclContext(SS))) { NestedNameSpecifier *NNS = static_cast(SS.getScopeRep()); NestedNameSpecifier *NNSPrefix = NNS->getPrefix(); switch (NNS->getKind()) { case NestedNameSpecifier::Identifier: ClsType = Context.getDependentNameType(ETK_None, NNSPrefix, NNS->getAsIdentifier()); break; case NestedNameSpecifier::Namespace: case NestedNameSpecifier::NamespaceAlias: case NestedNameSpecifier::Global: llvm_unreachable("Nested-name-specifier must name a type"); case NestedNameSpecifier::TypeSpec: case NestedNameSpecifier::TypeSpecWithTemplate: ClsType = QualType(NNS->getAsType(), 0); // Note: if the NNS has a prefix and ClsType is a nondependent // TemplateSpecializationType, then the NNS prefix is NOT included // in ClsType; hence we wrap ClsType into an ElaboratedType. // NOTE: in particular, no wrap occurs if ClsType already is an // Elaborated, DependentName, or DependentTemplateSpecialization. if (NNSPrefix && isa(NNS->getAsType())) ClsType = Context.getElaboratedType(ETK_None, NNSPrefix, ClsType); break; } } else { S.Diag(DeclType.Mem.Scope().getBeginLoc(), diag::err_illegal_decl_mempointer_in_nonclass) << (D.getIdentifier() ? D.getIdentifier()->getName() : "type name") << DeclType.Mem.Scope().getRange(); D.setInvalidType(true); } if (!ClsType.isNull()) T = S.BuildMemberPointerType(T, ClsType, DeclType.Loc, D.getIdentifier()); if (T.isNull()) { T = Context.IntTy; D.setInvalidType(true); } else if (DeclType.Mem.TypeQuals) { T = S.BuildQualifiedType(T, DeclType.Loc, DeclType.Mem.TypeQuals); } break; } if (T.isNull()) { D.setInvalidType(true); T = Context.IntTy; } // See if there are any attributes on this declarator chunk. if (AttributeList *attrs = const_cast(DeclType.getAttrs())) processTypeAttrs(state, T, TAL_DeclChunk, attrs); } if (LangOpts.CPlusPlus && T->isFunctionType()) { const FunctionProtoType *FnTy = T->getAs(); assert(FnTy && "Why oh why is there not a FunctionProtoType here?"); // C++ 8.3.5p4: // A cv-qualifier-seq shall only be part of the function type // for a nonstatic member function, the function type to which a pointer // to member refers, or the top-level function type of a function typedef // declaration. // // Core issue 547 also allows cv-qualifiers on function types that are // top-level template type arguments. bool FreeFunction; if (!D.getCXXScopeSpec().isSet()) { FreeFunction = ((D.getContext() != Declarator::MemberContext && D.getContext() != Declarator::LambdaExprContext) || D.getDeclSpec().isFriendSpecified()); } else { DeclContext *DC = S.computeDeclContext(D.getCXXScopeSpec()); FreeFunction = (DC && !DC->isRecord()); } // C++11 [dcl.fct]p6 (w/DR1417): // An attempt to specify a function type with a cv-qualifier-seq or a // ref-qualifier (including by typedef-name) is ill-formed unless it is: // - the function type for a non-static member function, // - the function type to which a pointer to member refers, // - the top-level function type of a function typedef declaration or // alias-declaration, // - the type-id in the default argument of a type-parameter, or // - the type-id of a template-argument for a type-parameter if (IsQualifiedFunction && !(!FreeFunction && D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) && !IsTypedefName && D.getContext() != Declarator::TemplateTypeArgContext) { SourceLocation Loc = D.getLocStart(); SourceRange RemovalRange; unsigned I; if (D.isFunctionDeclarator(I)) { SmallVector RemovalLocs; const DeclaratorChunk &Chunk = D.getTypeObject(I); assert(Chunk.Kind == DeclaratorChunk::Function); if (Chunk.Fun.hasRefQualifier()) RemovalLocs.push_back(Chunk.Fun.getRefQualifierLoc()); if (Chunk.Fun.TypeQuals & Qualifiers::Const) RemovalLocs.push_back(Chunk.Fun.getConstQualifierLoc()); if (Chunk.Fun.TypeQuals & Qualifiers::Volatile) RemovalLocs.push_back(Chunk.Fun.getVolatileQualifierLoc()); // FIXME: We do not track the location of the __restrict qualifier. //if (Chunk.Fun.TypeQuals & Qualifiers::Restrict) // RemovalLocs.push_back(Chunk.Fun.getRestrictQualifierLoc()); if (!RemovalLocs.empty()) { std::sort(RemovalLocs.begin(), RemovalLocs.end(), BeforeThanCompare(S.getSourceManager())); RemovalRange = SourceRange(RemovalLocs.front(), RemovalLocs.back()); Loc = RemovalLocs.front(); } } S.Diag(Loc, diag::err_invalid_qualified_function_type) << FreeFunction << D.isFunctionDeclarator() << T << getFunctionQualifiersAsString(FnTy) << FixItHint::CreateRemoval(RemovalRange); // Strip the cv-qualifiers and ref-qualifiers from the type. FunctionProtoType::ExtProtoInfo EPI = FnTy->getExtProtoInfo(); EPI.TypeQuals = 0; EPI.RefQualifier = RQ_None; T = Context.getFunctionType(FnTy->getResultType(), ArrayRef(FnTy->arg_type_begin(), FnTy->getNumArgs()), EPI); // Rebuild any parens around the identifier in the function type. for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { if (D.getTypeObject(i).Kind != DeclaratorChunk::Paren) break; T = S.BuildParenType(T); } } } // Apply any undistributed attributes from the declarator. if (!T.isNull()) if (AttributeList *attrs = D.getAttributes()) processTypeAttrs(state, T, TAL_DeclName, attrs); // Diagnose any ignored type attributes. if (!T.isNull()) state.diagnoseIgnoredTypeAttrs(T); // C++0x [dcl.constexpr]p9: // A constexpr specifier used in an object declaration declares the object // as const. if (D.getDeclSpec().isConstexprSpecified() && T->isObjectType()) { T.addConst(); } // If there was an ellipsis in the declarator, the declaration declares a // parameter pack whose type may be a pack expansion type. if (D.hasEllipsis() && !T.isNull()) { // C++0x [dcl.fct]p13: // A declarator-id or abstract-declarator containing an ellipsis shall // only be used in a parameter-declaration. Such a parameter-declaration // is a parameter pack (14.5.3). [...] switch (D.getContext()) { case Declarator::PrototypeContext: // C++0x [dcl.fct]p13: // [...] When it is part of a parameter-declaration-clause, the // parameter pack is a function parameter pack (14.5.3). The type T // of the declarator-id of the function parameter pack shall contain // a template parameter pack; each template parameter pack in T is // expanded by the function parameter pack. // // We represent function parameter packs as function parameters whose // type is a pack expansion. if (!T->containsUnexpandedParameterPack()) { S.Diag(D.getEllipsisLoc(), diag::err_function_parameter_pack_without_parameter_packs) << T << D.getSourceRange(); D.setEllipsisLoc(SourceLocation()); } else { T = Context.getPackExpansionType(T, None); } break; case Declarator::TemplateParamContext: // C++0x [temp.param]p15: // If a template-parameter is a [...] is a parameter-declaration that // declares a parameter pack (8.3.5), then the template-parameter is a // template parameter pack (14.5.3). // // Note: core issue 778 clarifies that, if there are any unexpanded // parameter packs in the type of the non-type template parameter, then // it expands those parameter packs. if (T->containsUnexpandedParameterPack()) T = Context.getPackExpansionType(T, None); else S.Diag(D.getEllipsisLoc(), LangOpts.CPlusPlus11 ? diag::warn_cxx98_compat_variadic_templates : diag::ext_variadic_templates); break; case Declarator::FileContext: case Declarator::KNRTypeListContext: case Declarator::ObjCParameterContext: // FIXME: special diagnostic here? case Declarator::ObjCResultContext: // FIXME: special diagnostic here? case Declarator::TypeNameContext: case Declarator::CXXNewContext: case Declarator::AliasDeclContext: case Declarator::AliasTemplateContext: case Declarator::MemberContext: case Declarator::BlockContext: case Declarator::ForContext: case Declarator::ConditionContext: case Declarator::CXXCatchContext: case Declarator::ObjCCatchContext: case Declarator::BlockLiteralContext: case Declarator::LambdaExprContext: case Declarator::TrailingReturnContext: case Declarator::TemplateTypeArgContext: // FIXME: We may want to allow parameter packs in block-literal contexts // in the future. S.Diag(D.getEllipsisLoc(), diag::err_ellipsis_in_declarator_not_parameter); D.setEllipsisLoc(SourceLocation()); break; } } if (T.isNull()) return Context.getNullTypeSourceInfo(); else if (D.isInvalidType()) return Context.getTrivialTypeSourceInfo(T); return S.GetTypeSourceInfoForDeclarator(D, T, TInfo); } /// GetTypeForDeclarator - Convert the type for the specified /// declarator to Type instances. /// /// The result of this call will never be null, but the associated /// type may be a null type if there's an unrecoverable error. TypeSourceInfo *Sema::GetTypeForDeclarator(Declarator &D, Scope *S) { // Determine the type of the declarator. Not all forms of declarator // have a type. TypeProcessingState state(*this, D); TypeSourceInfo *ReturnTypeInfo = 0; QualType T = GetDeclSpecTypeForDeclarator(state, ReturnTypeInfo); if (T.isNull()) return Context.getNullTypeSourceInfo(); if (D.isPrototypeContext() && getLangOpts().ObjCAutoRefCount) inferARCWriteback(state, T); return GetFullTypeForDeclarator(state, T, ReturnTypeInfo); } static void transferARCOwnershipToDeclSpec(Sema &S, QualType &declSpecTy, Qualifiers::ObjCLifetime ownership) { if (declSpecTy->isObjCRetainableType() && declSpecTy.getObjCLifetime() == Qualifiers::OCL_None) { Qualifiers qs; qs.addObjCLifetime(ownership); declSpecTy = S.Context.getQualifiedType(declSpecTy, qs); } } static void transferARCOwnershipToDeclaratorChunk(TypeProcessingState &state, Qualifiers::ObjCLifetime ownership, unsigned chunkIndex) { Sema &S = state.getSema(); Declarator &D = state.getDeclarator(); // Look for an explicit lifetime attribute. DeclaratorChunk &chunk = D.getTypeObject(chunkIndex); for (const AttributeList *attr = chunk.getAttrs(); attr; attr = attr->getNext()) if (attr->getKind() == AttributeList::AT_ObjCOwnership) return; const char *attrStr = 0; switch (ownership) { case Qualifiers::OCL_None: llvm_unreachable("no ownership!"); case Qualifiers::OCL_ExplicitNone: attrStr = "none"; break; case Qualifiers::OCL_Strong: attrStr = "strong"; break; case Qualifiers::OCL_Weak: attrStr = "weak"; break; case Qualifiers::OCL_Autoreleasing: attrStr = "autoreleasing"; break; } // If there wasn't one, add one (with an invalid source location // so that we don't make an AttributedType for it). AttributeList *attr = D.getAttributePool() .create(&S.Context.Idents.get("objc_ownership"), SourceLocation(), /*scope*/ 0, SourceLocation(), &S.Context.Idents.get(attrStr), SourceLocation(), /*args*/ 0, 0, AttributeList::AS_GNU); spliceAttrIntoList(*attr, chunk.getAttrListRef()); // TODO: mark whether we did this inference? } /// \brief Used for transferring ownership in casts resulting in l-values. static void transferARCOwnership(TypeProcessingState &state, QualType &declSpecTy, Qualifiers::ObjCLifetime ownership) { Sema &S = state.getSema(); Declarator &D = state.getDeclarator(); int inner = -1; bool hasIndirection = false; for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { DeclaratorChunk &chunk = D.getTypeObject(i); switch (chunk.Kind) { case DeclaratorChunk::Paren: // Ignore parens. break; case DeclaratorChunk::Array: case DeclaratorChunk::Reference: case DeclaratorChunk::Pointer: if (inner != -1) hasIndirection = true; inner = i; break; case DeclaratorChunk::BlockPointer: if (inner != -1) transferARCOwnershipToDeclaratorChunk(state, ownership, i); return; case DeclaratorChunk::Function: case DeclaratorChunk::MemberPointer: return; } } if (inner == -1) return; DeclaratorChunk &chunk = D.getTypeObject(inner); if (chunk.Kind == DeclaratorChunk::Pointer) { if (declSpecTy->isObjCRetainableType()) return transferARCOwnershipToDeclSpec(S, declSpecTy, ownership); if (declSpecTy->isObjCObjectType() && hasIndirection) return transferARCOwnershipToDeclaratorChunk(state, ownership, inner); } else { assert(chunk.Kind == DeclaratorChunk::Array || chunk.Kind == DeclaratorChunk::Reference); return transferARCOwnershipToDeclSpec(S, declSpecTy, ownership); } } TypeSourceInfo *Sema::GetTypeForDeclaratorCast(Declarator &D, QualType FromTy) { TypeProcessingState state(*this, D); TypeSourceInfo *ReturnTypeInfo = 0; QualType declSpecTy = GetDeclSpecTypeForDeclarator(state, ReturnTypeInfo); if (declSpecTy.isNull()) return Context.getNullTypeSourceInfo(); if (getLangOpts().ObjCAutoRefCount) { Qualifiers::ObjCLifetime ownership = Context.getInnerObjCOwnership(FromTy); if (ownership != Qualifiers::OCL_None) transferARCOwnership(state, declSpecTy, ownership); } return GetFullTypeForDeclarator(state, declSpecTy, ReturnTypeInfo); } /// Map an AttributedType::Kind to an AttributeList::Kind. static AttributeList::Kind getAttrListKind(AttributedType::Kind kind) { switch (kind) { case AttributedType::attr_address_space: return AttributeList::AT_AddressSpace; case AttributedType::attr_regparm: return AttributeList::AT_Regparm; case AttributedType::attr_vector_size: return AttributeList::AT_VectorSize; case AttributedType::attr_neon_vector_type: return AttributeList::AT_NeonVectorType; case AttributedType::attr_neon_polyvector_type: return AttributeList::AT_NeonPolyVectorType; case AttributedType::attr_objc_gc: return AttributeList::AT_ObjCGC; case AttributedType::attr_objc_ownership: return AttributeList::AT_ObjCOwnership; case AttributedType::attr_noreturn: return AttributeList::AT_NoReturn; case AttributedType::attr_cdecl: return AttributeList::AT_CDecl; case AttributedType::attr_fastcall: return AttributeList::AT_FastCall; case AttributedType::attr_stdcall: return AttributeList::AT_StdCall; case AttributedType::attr_thiscall: return AttributeList::AT_ThisCall; case AttributedType::attr_pascal: return AttributeList::AT_Pascal; case AttributedType::attr_pcs: return AttributeList::AT_Pcs; case AttributedType::attr_pnaclcall: return AttributeList::AT_PnaclCall; case AttributedType::attr_inteloclbicc: return AttributeList::AT_IntelOclBicc; } llvm_unreachable("unexpected attribute kind!"); } static void fillAttributedTypeLoc(AttributedTypeLoc TL, const AttributeList *attrs) { AttributedType::Kind kind = TL.getAttrKind(); assert(attrs && "no type attributes in the expected location!"); AttributeList::Kind parsedKind = getAttrListKind(kind); while (attrs->getKind() != parsedKind) { attrs = attrs->getNext(); assert(attrs && "no matching attribute in expected location!"); } TL.setAttrNameLoc(attrs->getLoc()); if (TL.hasAttrExprOperand()) TL.setAttrExprOperand(attrs->getArg(0)); else if (TL.hasAttrEnumOperand()) TL.setAttrEnumOperandLoc(attrs->getParameterLoc()); // FIXME: preserve this information to here. if (TL.hasAttrOperand()) TL.setAttrOperandParensRange(SourceRange()); } namespace { class TypeSpecLocFiller : public TypeLocVisitor { ASTContext &Context; const DeclSpec &DS; public: TypeSpecLocFiller(ASTContext &Context, const DeclSpec &DS) : Context(Context), DS(DS) {} void VisitAttributedTypeLoc(AttributedTypeLoc TL) { fillAttributedTypeLoc(TL, DS.getAttributes().getList()); Visit(TL.getModifiedLoc()); } void VisitQualifiedTypeLoc(QualifiedTypeLoc TL) { Visit(TL.getUnqualifiedLoc()); } void VisitTypedefTypeLoc(TypedefTypeLoc TL) { TL.setNameLoc(DS.getTypeSpecTypeLoc()); } void VisitObjCInterfaceTypeLoc(ObjCInterfaceTypeLoc TL) { TL.setNameLoc(DS.getTypeSpecTypeLoc()); // FIXME. We should have DS.getTypeSpecTypeEndLoc(). But, it requires // addition field. What we have is good enough for dispay of location // of 'fixit' on interface name. TL.setNameEndLoc(DS.getLocEnd()); } void VisitObjCObjectTypeLoc(ObjCObjectTypeLoc TL) { // Handle the base type, which might not have been written explicitly. if (DS.getTypeSpecType() == DeclSpec::TST_unspecified) { TL.setHasBaseTypeAsWritten(false); TL.getBaseLoc().initialize(Context, SourceLocation()); } else { TL.setHasBaseTypeAsWritten(true); Visit(TL.getBaseLoc()); } // Protocol qualifiers. if (DS.getProtocolQualifiers()) { assert(TL.getNumProtocols() > 0); assert(TL.getNumProtocols() == DS.getNumProtocolQualifiers()); TL.setLAngleLoc(DS.getProtocolLAngleLoc()); TL.setRAngleLoc(DS.getSourceRange().getEnd()); for (unsigned i = 0, e = DS.getNumProtocolQualifiers(); i != e; ++i) TL.setProtocolLoc(i, DS.getProtocolLocs()[i]); } else { assert(TL.getNumProtocols() == 0); TL.setLAngleLoc(SourceLocation()); TL.setRAngleLoc(SourceLocation()); } } void VisitObjCObjectPointerTypeLoc(ObjCObjectPointerTypeLoc TL) { TL.setStarLoc(SourceLocation()); Visit(TL.getPointeeLoc()); } void VisitTemplateSpecializationTypeLoc(TemplateSpecializationTypeLoc TL) { TypeSourceInfo *TInfo = 0; Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); // If we got no declarator info from previous Sema routines, // just fill with the typespec loc. if (!TInfo) { TL.initialize(Context, DS.getTypeSpecTypeNameLoc()); return; } TypeLoc OldTL = TInfo->getTypeLoc(); if (TInfo->getType()->getAs()) { ElaboratedTypeLoc ElabTL = OldTL.castAs(); TemplateSpecializationTypeLoc NamedTL = ElabTL.getNamedTypeLoc() .castAs(); TL.copy(NamedTL); } else TL.copy(OldTL.castAs()); } void VisitTypeOfExprTypeLoc(TypeOfExprTypeLoc TL) { assert(DS.getTypeSpecType() == DeclSpec::TST_typeofExpr); TL.setTypeofLoc(DS.getTypeSpecTypeLoc()); TL.setParensRange(DS.getTypeofParensRange()); } void VisitTypeOfTypeLoc(TypeOfTypeLoc TL) { assert(DS.getTypeSpecType() == DeclSpec::TST_typeofType); TL.setTypeofLoc(DS.getTypeSpecTypeLoc()); TL.setParensRange(DS.getTypeofParensRange()); assert(DS.getRepAsType()); TypeSourceInfo *TInfo = 0; Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); TL.setUnderlyingTInfo(TInfo); } void VisitUnaryTransformTypeLoc(UnaryTransformTypeLoc TL) { // FIXME: This holds only because we only have one unary transform. assert(DS.getTypeSpecType() == DeclSpec::TST_underlyingType); TL.setKWLoc(DS.getTypeSpecTypeLoc()); TL.setParensRange(DS.getTypeofParensRange()); assert(DS.getRepAsType()); TypeSourceInfo *TInfo = 0; Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); TL.setUnderlyingTInfo(TInfo); } void VisitBuiltinTypeLoc(BuiltinTypeLoc TL) { // By default, use the source location of the type specifier. TL.setBuiltinLoc(DS.getTypeSpecTypeLoc()); if (TL.needsExtraLocalData()) { // Set info for the written builtin specifiers. TL.getWrittenBuiltinSpecs() = DS.getWrittenBuiltinSpecs(); // Try to have a meaningful source location. if (TL.getWrittenSignSpec() != TSS_unspecified) // Sign spec loc overrides the others (e.g., 'unsigned long'). TL.setBuiltinLoc(DS.getTypeSpecSignLoc()); else if (TL.getWrittenWidthSpec() != TSW_unspecified) // Width spec loc overrides type spec loc (e.g., 'short int'). TL.setBuiltinLoc(DS.getTypeSpecWidthLoc()); } } void VisitElaboratedTypeLoc(ElaboratedTypeLoc TL) { ElaboratedTypeKeyword Keyword = TypeWithKeyword::getKeywordForTypeSpec(DS.getTypeSpecType()); if (DS.getTypeSpecType() == TST_typename) { TypeSourceInfo *TInfo = 0; Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); if (TInfo) { TL.copy(TInfo->getTypeLoc().castAs()); return; } } TL.setElaboratedKeywordLoc(Keyword != ETK_None ? DS.getTypeSpecTypeLoc() : SourceLocation()); const CXXScopeSpec& SS = DS.getTypeSpecScope(); TL.setQualifierLoc(SS.getWithLocInContext(Context)); Visit(TL.getNextTypeLoc().getUnqualifiedLoc()); } void VisitDependentNameTypeLoc(DependentNameTypeLoc TL) { assert(DS.getTypeSpecType() == TST_typename); TypeSourceInfo *TInfo = 0; Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); assert(TInfo); TL.copy(TInfo->getTypeLoc().castAs()); } void VisitDependentTemplateSpecializationTypeLoc( DependentTemplateSpecializationTypeLoc TL) { assert(DS.getTypeSpecType() == TST_typename); TypeSourceInfo *TInfo = 0; Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); assert(TInfo); TL.copy( TInfo->getTypeLoc().castAs()); } void VisitTagTypeLoc(TagTypeLoc TL) { TL.setNameLoc(DS.getTypeSpecTypeNameLoc()); } void VisitAtomicTypeLoc(AtomicTypeLoc TL) { // An AtomicTypeLoc can come from either an _Atomic(...) type specifier // or an _Atomic qualifier. if (DS.getTypeSpecType() == DeclSpec::TST_atomic) { TL.setKWLoc(DS.getTypeSpecTypeLoc()); TL.setParensRange(DS.getTypeofParensRange()); TypeSourceInfo *TInfo = 0; Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); assert(TInfo); TL.getValueLoc().initializeFullCopy(TInfo->getTypeLoc()); } else { TL.setKWLoc(DS.getAtomicSpecLoc()); // No parens, to indicate this was spelled as an _Atomic qualifier. TL.setParensRange(SourceRange()); Visit(TL.getValueLoc()); } } void VisitTypeLoc(TypeLoc TL) { // FIXME: add other typespec types and change this to an assert. TL.initialize(Context, DS.getTypeSpecTypeLoc()); } }; class DeclaratorLocFiller : public TypeLocVisitor { ASTContext &Context; const DeclaratorChunk &Chunk; public: DeclaratorLocFiller(ASTContext &Context, const DeclaratorChunk &Chunk) : Context(Context), Chunk(Chunk) {} void VisitQualifiedTypeLoc(QualifiedTypeLoc TL) { llvm_unreachable("qualified type locs not expected here!"); } void VisitAttributedTypeLoc(AttributedTypeLoc TL) { fillAttributedTypeLoc(TL, Chunk.getAttrs()); } void VisitBlockPointerTypeLoc(BlockPointerTypeLoc TL) { assert(Chunk.Kind == DeclaratorChunk::BlockPointer); TL.setCaretLoc(Chunk.Loc); } void VisitPointerTypeLoc(PointerTypeLoc TL) { assert(Chunk.Kind == DeclaratorChunk::Pointer); TL.setStarLoc(Chunk.Loc); } void VisitObjCObjectPointerTypeLoc(ObjCObjectPointerTypeLoc TL) { assert(Chunk.Kind == DeclaratorChunk::Pointer); TL.setStarLoc(Chunk.Loc); } void VisitMemberPointerTypeLoc(MemberPointerTypeLoc TL) { assert(Chunk.Kind == DeclaratorChunk::MemberPointer); const CXXScopeSpec& SS = Chunk.Mem.Scope(); NestedNameSpecifierLoc NNSLoc = SS.getWithLocInContext(Context); const Type* ClsTy = TL.getClass(); QualType ClsQT = QualType(ClsTy, 0); TypeSourceInfo *ClsTInfo = Context.CreateTypeSourceInfo(ClsQT, 0); // Now copy source location info into the type loc component. TypeLoc ClsTL = ClsTInfo->getTypeLoc(); switch (NNSLoc.getNestedNameSpecifier()->getKind()) { case NestedNameSpecifier::Identifier: assert(isa(ClsTy) && "Unexpected TypeLoc"); { DependentNameTypeLoc DNTLoc = ClsTL.castAs(); DNTLoc.setElaboratedKeywordLoc(SourceLocation()); DNTLoc.setQualifierLoc(NNSLoc.getPrefix()); DNTLoc.setNameLoc(NNSLoc.getLocalBeginLoc()); } break; case NestedNameSpecifier::TypeSpec: case NestedNameSpecifier::TypeSpecWithTemplate: if (isa(ClsTy)) { ElaboratedTypeLoc ETLoc = ClsTL.castAs(); ETLoc.setElaboratedKeywordLoc(SourceLocation()); ETLoc.setQualifierLoc(NNSLoc.getPrefix()); TypeLoc NamedTL = ETLoc.getNamedTypeLoc(); NamedTL.initializeFullCopy(NNSLoc.getTypeLoc()); } else { ClsTL.initializeFullCopy(NNSLoc.getTypeLoc()); } break; case NestedNameSpecifier::Namespace: case NestedNameSpecifier::NamespaceAlias: case NestedNameSpecifier::Global: llvm_unreachable("Nested-name-specifier must name a type"); } // Finally fill in MemberPointerLocInfo fields. TL.setStarLoc(Chunk.Loc); TL.setClassTInfo(ClsTInfo); } void VisitLValueReferenceTypeLoc(LValueReferenceTypeLoc TL) { assert(Chunk.Kind == DeclaratorChunk::Reference); // 'Amp' is misleading: this might have been originally /// spelled with AmpAmp. TL.setAmpLoc(Chunk.Loc); } void VisitRValueReferenceTypeLoc(RValueReferenceTypeLoc TL) { assert(Chunk.Kind == DeclaratorChunk::Reference); assert(!Chunk.Ref.LValueRef); TL.setAmpAmpLoc(Chunk.Loc); } void VisitArrayTypeLoc(ArrayTypeLoc TL) { assert(Chunk.Kind == DeclaratorChunk::Array); TL.setLBracketLoc(Chunk.Loc); TL.setRBracketLoc(Chunk.EndLoc); TL.setSizeExpr(static_cast(Chunk.Arr.NumElts)); } void VisitFunctionTypeLoc(FunctionTypeLoc TL) { assert(Chunk.Kind == DeclaratorChunk::Function); TL.setLocalRangeBegin(Chunk.Loc); TL.setLocalRangeEnd(Chunk.EndLoc); const DeclaratorChunk::FunctionTypeInfo &FTI = Chunk.Fun; TL.setLParenLoc(FTI.getLParenLoc()); TL.setRParenLoc(FTI.getRParenLoc()); for (unsigned i = 0, e = TL.getNumArgs(), tpi = 0; i != e; ++i) { ParmVarDecl *Param = cast(FTI.ArgInfo[i].Param); TL.setArg(tpi++, Param); } // FIXME: exception specs } void VisitParenTypeLoc(ParenTypeLoc TL) { assert(Chunk.Kind == DeclaratorChunk::Paren); TL.setLParenLoc(Chunk.Loc); TL.setRParenLoc(Chunk.EndLoc); } void VisitTypeLoc(TypeLoc TL) { llvm_unreachable("unsupported TypeLoc kind in declarator!"); } }; } static void fillAtomicQualLoc(AtomicTypeLoc ATL, const DeclaratorChunk &Chunk) { SourceLocation Loc; switch (Chunk.Kind) { case DeclaratorChunk::Function: case DeclaratorChunk::Array: case DeclaratorChunk::Paren: llvm_unreachable("cannot be _Atomic qualified"); case DeclaratorChunk::Pointer: Loc = SourceLocation::getFromRawEncoding(Chunk.Ptr.AtomicQualLoc); break; case DeclaratorChunk::BlockPointer: case DeclaratorChunk::Reference: case DeclaratorChunk::MemberPointer: // FIXME: Provide a source location for the _Atomic keyword. break; } ATL.setKWLoc(Loc); ATL.setParensRange(SourceRange()); } /// \brief Create and instantiate a TypeSourceInfo with type source information. /// /// \param T QualType referring to the type as written in source code. /// /// \param ReturnTypeInfo For declarators whose return type does not show /// up in the normal place in the declaration specifiers (such as a C++ /// conversion function), this pointer will refer to a type source information /// for that return type. TypeSourceInfo * Sema::GetTypeSourceInfoForDeclarator(Declarator &D, QualType T, TypeSourceInfo *ReturnTypeInfo) { TypeSourceInfo *TInfo = Context.CreateTypeSourceInfo(T); UnqualTypeLoc CurrTL = TInfo->getTypeLoc().getUnqualifiedLoc(); // Handle parameter packs whose type is a pack expansion. if (isa(T)) { CurrTL.castAs().setEllipsisLoc(D.getEllipsisLoc()); CurrTL = CurrTL.getNextTypeLoc().getUnqualifiedLoc(); } for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { // An AtomicTypeLoc might be produced by an atomic qualifier in this // declarator chunk. if (AtomicTypeLoc ATL = CurrTL.getAs()) { fillAtomicQualLoc(ATL, D.getTypeObject(i)); CurrTL = ATL.getValueLoc().getUnqualifiedLoc(); } while (AttributedTypeLoc TL = CurrTL.getAs()) { fillAttributedTypeLoc(TL, D.getTypeObject(i).getAttrs()); CurrTL = TL.getNextTypeLoc().getUnqualifiedLoc(); } DeclaratorLocFiller(Context, D.getTypeObject(i)).Visit(CurrTL); CurrTL = CurrTL.getNextTypeLoc().getUnqualifiedLoc(); } // If we have different source information for the return type, use // that. This really only applies to C++ conversion functions. if (ReturnTypeInfo) { TypeLoc TL = ReturnTypeInfo->getTypeLoc(); assert(TL.getFullDataSize() == CurrTL.getFullDataSize()); memcpy(CurrTL.getOpaqueData(), TL.getOpaqueData(), TL.getFullDataSize()); } else { TypeSpecLocFiller(Context, D.getDeclSpec()).Visit(CurrTL); } return TInfo; } /// \brief Create a LocInfoType to hold the given QualType and TypeSourceInfo. ParsedType Sema::CreateParsedType(QualType T, TypeSourceInfo *TInfo) { // FIXME: LocInfoTypes are "transient", only needed for passing to/from Parser // and Sema during declaration parsing. Try deallocating/caching them when // it's appropriate, instead of allocating them and keeping them around. LocInfoType *LocT = (LocInfoType*)BumpAlloc.Allocate(sizeof(LocInfoType), TypeAlignment); new (LocT) LocInfoType(T, TInfo); assert(LocT->getTypeClass() != T->getTypeClass() && "LocInfoType's TypeClass conflicts with an existing Type class"); return ParsedType::make(QualType(LocT, 0)); } void LocInfoType::getAsStringInternal(std::string &Str, const PrintingPolicy &Policy) const { llvm_unreachable("LocInfoType leaked into the type system; an opaque TypeTy*" " was used directly instead of getting the QualType through" " GetTypeFromParser"); } TypeResult Sema::ActOnTypeName(Scope *S, Declarator &D) { // C99 6.7.6: Type names have no identifier. This is already validated by // the parser. assert(D.getIdentifier() == 0 && "Type name should have no identifier!"); TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); QualType T = TInfo->getType(); if (D.isInvalidType()) return true; // Make sure there are no unused decl attributes on the declarator. // We don't want to do this for ObjC parameters because we're going // to apply them to the actual parameter declaration. // Likewise, we don't want to do this for alias declarations, because // we are actually going to build a declaration from this eventually. if (D.getContext() != Declarator::ObjCParameterContext && D.getContext() != Declarator::AliasDeclContext && D.getContext() != Declarator::AliasTemplateContext) checkUnusedDeclAttributes(D); if (getLangOpts().CPlusPlus) { // Check that there are no default arguments (C++ only). CheckExtraCXXDefaultArguments(D); } return CreateParsedType(T, TInfo); } ParsedType Sema::ActOnObjCInstanceType(SourceLocation Loc) { QualType T = Context.getObjCInstanceType(); TypeSourceInfo *TInfo = Context.getTrivialTypeSourceInfo(T, Loc); return CreateParsedType(T, TInfo); } //===----------------------------------------------------------------------===// // Type Attribute Processing //===----------------------------------------------------------------------===// /// HandleAddressSpaceTypeAttribute - Process an address_space attribute on the /// specified type. The attribute contains 1 argument, the id of the address /// space for the type. static void HandleAddressSpaceTypeAttribute(QualType &Type, const AttributeList &Attr, Sema &S){ // If this type is already address space qualified, reject it. // ISO/IEC TR 18037 S5.3 (amending C99 6.7.3): "No type shall be qualified by // qualifiers for two or more different address spaces." if (Type.getAddressSpace()) { S.Diag(Attr.getLoc(), diag::err_attribute_address_multiple_qualifiers); Attr.setInvalid(); return; } // ISO/IEC TR 18037 S5.3 (amending C99 6.7.3): "A function type shall not be // qualified by an address-space qualifier." if (Type->isFunctionType()) { S.Diag(Attr.getLoc(), diag::err_attribute_address_function_type); Attr.setInvalid(); return; } // Check the attribute arguments. if (Attr.getNumArgs() != 1) { S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; Attr.setInvalid(); return; } Expr *ASArgExpr = static_cast(Attr.getArg(0)); llvm::APSInt addrSpace(32); if (ASArgExpr->isTypeDependent() || ASArgExpr->isValueDependent() || !ASArgExpr->isIntegerConstantExpr(addrSpace, S.Context)) { S.Diag(Attr.getLoc(), diag::err_attribute_address_space_not_int) << ASArgExpr->getSourceRange(); Attr.setInvalid(); return; } // Bounds checking. if (addrSpace.isSigned()) { if (addrSpace.isNegative()) { S.Diag(Attr.getLoc(), diag::err_attribute_address_space_negative) << ASArgExpr->getSourceRange(); Attr.setInvalid(); return; } addrSpace.setIsSigned(false); } llvm::APSInt max(addrSpace.getBitWidth()); max = Qualifiers::MaxAddressSpace; if (addrSpace > max) { S.Diag(Attr.getLoc(), diag::err_attribute_address_space_too_high) << Qualifiers::MaxAddressSpace << ASArgExpr->getSourceRange(); Attr.setInvalid(); return; } unsigned ASIdx = static_cast(addrSpace.getZExtValue()); Type = S.Context.getAddrSpaceQualType(Type, ASIdx); } /// Does this type have a "direct" ownership qualifier? That is, /// is it written like "__strong id", as opposed to something like /// "typeof(foo)", where that happens to be strong? static bool hasDirectOwnershipQualifier(QualType type) { // Fast path: no qualifier at all. assert(type.getQualifiers().hasObjCLifetime()); while (true) { // __strong id if (const AttributedType *attr = dyn_cast(type)) { if (attr->getAttrKind() == AttributedType::attr_objc_ownership) return true; type = attr->getModifiedType(); // X *__strong (...) } else if (const ParenType *paren = dyn_cast(type)) { type = paren->getInnerType(); // That's it for things we want to complain about. In particular, // we do not want to look through typedefs, typeof(expr), // typeof(type), or any other way that the type is somehow // abstracted. } else { return false; } } } /// handleObjCOwnershipTypeAttr - Process an objc_ownership /// attribute on the specified type. /// /// Returns 'true' if the attribute was handled. static bool handleObjCOwnershipTypeAttr(TypeProcessingState &state, AttributeList &attr, QualType &type) { bool NonObjCPointer = false; if (!type->isDependentType()) { if (const PointerType *ptr = type->getAs()) { QualType pointee = ptr->getPointeeType(); if (pointee->isObjCRetainableType() || pointee->isPointerType()) return false; // It is important not to lose the source info that there was an attribute // applied to non-objc pointer. We will create an attributed type but // its type will be the same as the original type. NonObjCPointer = true; } else if (!type->isObjCRetainableType()) { return false; } // Don't accept an ownership attribute in the declspec if it would // just be the return type of a block pointer. if (state.isProcessingDeclSpec()) { Declarator &D = state.getDeclarator(); if (maybeMovePastReturnType(D, D.getNumTypeObjects())) return false; } } Sema &S = state.getSema(); SourceLocation AttrLoc = attr.getLoc(); if (AttrLoc.isMacroID()) AttrLoc = S.getSourceManager().getImmediateExpansionRange(AttrLoc).first; if (!attr.getParameterName()) { S.Diag(AttrLoc, diag::err_attribute_argument_n_not_string) << "objc_ownership" << 1; attr.setInvalid(); return true; } // Consume lifetime attributes without further comment outside of // ARC mode. if (!S.getLangOpts().ObjCAutoRefCount) return true; Qualifiers::ObjCLifetime lifetime; if (attr.getParameterName()->isStr("none")) lifetime = Qualifiers::OCL_ExplicitNone; else if (attr.getParameterName()->isStr("strong")) lifetime = Qualifiers::OCL_Strong; else if (attr.getParameterName()->isStr("weak")) lifetime = Qualifiers::OCL_Weak; else if (attr.getParameterName()->isStr("autoreleasing")) lifetime = Qualifiers::OCL_Autoreleasing; else { S.Diag(AttrLoc, diag::warn_attribute_type_not_supported) << "objc_ownership" << attr.getParameterName(); attr.setInvalid(); return true; } SplitQualType underlyingType = type.split(); // Check for redundant/conflicting ownership qualifiers. if (Qualifiers::ObjCLifetime previousLifetime = type.getQualifiers().getObjCLifetime()) { // If it's written directly, that's an error. if (hasDirectOwnershipQualifier(type)) { S.Diag(AttrLoc, diag::err_attr_objc_ownership_redundant) << type; return true; } // Otherwise, if the qualifiers actually conflict, pull sugar off // until we reach a type that is directly qualified. if (previousLifetime != lifetime) { // This should always terminate: the canonical type is // qualified, so some bit of sugar must be hiding it. while (!underlyingType.Quals.hasObjCLifetime()) { underlyingType = underlyingType.getSingleStepDesugaredType(); } underlyingType.Quals.removeObjCLifetime(); } } underlyingType.Quals.addObjCLifetime(lifetime); if (NonObjCPointer) { StringRef name = attr.getName()->getName(); switch (lifetime) { case Qualifiers::OCL_None: case Qualifiers::OCL_ExplicitNone: break; case Qualifiers::OCL_Strong: name = "__strong"; break; case Qualifiers::OCL_Weak: name = "__weak"; break; case Qualifiers::OCL_Autoreleasing: name = "__autoreleasing"; break; } S.Diag(AttrLoc, diag::warn_objc_object_attribute_wrong_type) << name << type; } QualType origType = type; if (!NonObjCPointer) type = S.Context.getQualifiedType(underlyingType); // If we have a valid source location for the attribute, use an // AttributedType instead. if (AttrLoc.isValid()) type = S.Context.getAttributedType(AttributedType::attr_objc_ownership, origType, type); // Forbid __weak if the runtime doesn't support it. if (lifetime == Qualifiers::OCL_Weak && !S.getLangOpts().ObjCARCWeak && !NonObjCPointer) { // Actually, delay this until we know what we're parsing. if (S.DelayedDiagnostics.shouldDelayDiagnostics()) { S.DelayedDiagnostics.add( sema::DelayedDiagnostic::makeForbiddenType( S.getSourceManager().getExpansionLoc(AttrLoc), diag::err_arc_weak_no_runtime, type, /*ignored*/ 0)); } else { S.Diag(AttrLoc, diag::err_arc_weak_no_runtime); } attr.setInvalid(); return true; } // Forbid __weak for class objects marked as // objc_arc_weak_reference_unavailable if (lifetime == Qualifiers::OCL_Weak) { if (const ObjCObjectPointerType *ObjT = type->getAs()) { if (ObjCInterfaceDecl *Class = ObjT->getInterfaceDecl()) { if (Class->isArcWeakrefUnavailable()) { S.Diag(AttrLoc, diag::err_arc_unsupported_weak_class); S.Diag(ObjT->getInterfaceDecl()->getLocation(), diag::note_class_declared); } } } } return true; } /// handleObjCGCTypeAttr - Process the __attribute__((objc_gc)) type /// attribute on the specified type. Returns true to indicate that /// the attribute was handled, false to indicate that the type does /// not permit the attribute. static bool handleObjCGCTypeAttr(TypeProcessingState &state, AttributeList &attr, QualType &type) { Sema &S = state.getSema(); // Delay if this isn't some kind of pointer. if (!type->isPointerType() && !type->isObjCObjectPointerType() && !type->isBlockPointerType()) return false; if (type.getObjCGCAttr() != Qualifiers::GCNone) { S.Diag(attr.getLoc(), diag::err_attribute_multiple_objc_gc); attr.setInvalid(); return true; } // Check the attribute arguments. if (!attr.getParameterName()) { S.Diag(attr.getLoc(), diag::err_attribute_argument_n_not_string) << "objc_gc" << 1; attr.setInvalid(); return true; } Qualifiers::GC GCAttr; if (attr.getNumArgs() != 0) { S.Diag(attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; attr.setInvalid(); return true; } if (attr.getParameterName()->isStr("weak")) GCAttr = Qualifiers::Weak; else if (attr.getParameterName()->isStr("strong")) GCAttr = Qualifiers::Strong; else { S.Diag(attr.getLoc(), diag::warn_attribute_type_not_supported) << "objc_gc" << attr.getParameterName(); attr.setInvalid(); return true; } QualType origType = type; type = S.Context.getObjCGCQualType(origType, GCAttr); // Make an attributed type to preserve the source information. if (attr.getLoc().isValid()) type = S.Context.getAttributedType(AttributedType::attr_objc_gc, origType, type); return true; } namespace { /// A helper class to unwrap a type down to a function for the /// purposes of applying attributes there. /// /// Use: /// FunctionTypeUnwrapper unwrapped(SemaRef, T); /// if (unwrapped.isFunctionType()) { /// const FunctionType *fn = unwrapped.get(); /// // change fn somehow /// T = unwrapped.wrap(fn); /// } struct FunctionTypeUnwrapper { enum WrapKind { Desugar, Parens, Pointer, BlockPointer, Reference, MemberPointer }; QualType Original; const FunctionType *Fn; SmallVector Stack; FunctionTypeUnwrapper(Sema &S, QualType T) : Original(T) { while (true) { const Type *Ty = T.getTypePtr(); if (isa(Ty)) { Fn = cast(Ty); return; } else if (isa(Ty)) { T = cast(Ty)->getInnerType(); Stack.push_back(Parens); } else if (isa(Ty)) { T = cast(Ty)->getPointeeType(); Stack.push_back(Pointer); } else if (isa(Ty)) { T = cast(Ty)->getPointeeType(); Stack.push_back(BlockPointer); } else if (isa(Ty)) { T = cast(Ty)->getPointeeType(); Stack.push_back(MemberPointer); } else if (isa(Ty)) { T = cast(Ty)->getPointeeType(); Stack.push_back(Reference); } else { const Type *DTy = Ty->getUnqualifiedDesugaredType(); if (Ty == DTy) { Fn = 0; return; } T = QualType(DTy, 0); Stack.push_back(Desugar); } } } bool isFunctionType() const { return (Fn != 0); } const FunctionType *get() const { return Fn; } QualType wrap(Sema &S, const FunctionType *New) { // If T wasn't modified from the unwrapped type, do nothing. if (New == get()) return Original; Fn = New; return wrap(S.Context, Original, 0); } private: QualType wrap(ASTContext &C, QualType Old, unsigned I) { if (I == Stack.size()) return C.getQualifiedType(Fn, Old.getQualifiers()); // Build up the inner type, applying the qualifiers from the old // type to the new type. SplitQualType SplitOld = Old.split(); // As a special case, tail-recurse if there are no qualifiers. if (SplitOld.Quals.empty()) return wrap(C, SplitOld.Ty, I); return C.getQualifiedType(wrap(C, SplitOld.Ty, I), SplitOld.Quals); } QualType wrap(ASTContext &C, const Type *Old, unsigned I) { if (I == Stack.size()) return QualType(Fn, 0); switch (static_cast(Stack[I++])) { case Desugar: // This is the point at which we potentially lose source // information. return wrap(C, Old->getUnqualifiedDesugaredType(), I); case Parens: { QualType New = wrap(C, cast(Old)->getInnerType(), I); return C.getParenType(New); } case Pointer: { QualType New = wrap(C, cast(Old)->getPointeeType(), I); return C.getPointerType(New); } case BlockPointer: { QualType New = wrap(C, cast(Old)->getPointeeType(),I); return C.getBlockPointerType(New); } case MemberPointer: { const MemberPointerType *OldMPT = cast(Old); QualType New = wrap(C, OldMPT->getPointeeType(), I); return C.getMemberPointerType(New, OldMPT->getClass()); } case Reference: { const ReferenceType *OldRef = cast(Old); QualType New = wrap(C, OldRef->getPointeeType(), I); if (isa(OldRef)) return C.getLValueReferenceType(New, OldRef->isSpelledAsLValue()); else return C.getRValueReferenceType(New); } } llvm_unreachable("unknown wrapping kind"); } }; } /// Process an individual function attribute. Returns true to /// indicate that the attribute was handled, false if it wasn't. static bool handleFunctionTypeAttr(TypeProcessingState &state, AttributeList &attr, QualType &type) { Sema &S = state.getSema(); FunctionTypeUnwrapper unwrapped(S, type); if (attr.getKind() == AttributeList::AT_NoReturn) { if (S.CheckNoReturnAttr(attr)) return true; // Delay if this is not a function type. if (!unwrapped.isFunctionType()) return false; // Otherwise we can process right away. FunctionType::ExtInfo EI = unwrapped.get()->getExtInfo().withNoReturn(true); type = unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI)); return true; } // ns_returns_retained is not always a type attribute, but if we got // here, we're treating it as one right now. if (attr.getKind() == AttributeList::AT_NSReturnsRetained) { assert(S.getLangOpts().ObjCAutoRefCount && "ns_returns_retained treated as type attribute in non-ARC"); if (attr.getNumArgs()) return true; // Delay if this is not a function type. if (!unwrapped.isFunctionType()) return false; FunctionType::ExtInfo EI = unwrapped.get()->getExtInfo().withProducesResult(true); type = unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI)); return true; } if (attr.getKind() == AttributeList::AT_Regparm) { unsigned value; if (S.CheckRegparmAttr(attr, value)) return true; // Delay if this is not a function type. if (!unwrapped.isFunctionType()) return false; // Diagnose regparm with fastcall. const FunctionType *fn = unwrapped.get(); CallingConv CC = fn->getCallConv(); if (CC == CC_X86FastCall) { S.Diag(attr.getLoc(), diag::err_attributes_are_not_compatible) << FunctionType::getNameForCallConv(CC) << "regparm"; attr.setInvalid(); return true; } FunctionType::ExtInfo EI = unwrapped.get()->getExtInfo().withRegParm(value); type = unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI)); return true; } // Delay if the type didn't work out to a function. if (!unwrapped.isFunctionType()) return false; // Otherwise, a calling convention. CallingConv CC; if (S.CheckCallingConvAttr(attr, CC)) return true; const FunctionType *fn = unwrapped.get(); CallingConv CCOld = fn->getCallConv(); if (S.Context.getCanonicalCallConv(CC) == S.Context.getCanonicalCallConv(CCOld)) { FunctionType::ExtInfo EI= unwrapped.get()->getExtInfo().withCallingConv(CC); type = unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI)); return true; } if (CCOld != (S.LangOpts.MRTD ? CC_X86StdCall : CC_Default)) { // Should we diagnose reapplications of the same convention? S.Diag(attr.getLoc(), diag::err_attributes_are_not_compatible) << FunctionType::getNameForCallConv(CC) << FunctionType::getNameForCallConv(CCOld); attr.setInvalid(); return true; } // Diagnose the use of X86 fastcall on varargs or unprototyped functions. if (CC == CC_X86FastCall) { if (isa(fn)) { S.Diag(attr.getLoc(), diag::err_cconv_knr) << FunctionType::getNameForCallConv(CC); attr.setInvalid(); return true; } const FunctionProtoType *FnP = cast(fn); if (FnP->isVariadic()) { S.Diag(attr.getLoc(), diag::err_cconv_varargs) << FunctionType::getNameForCallConv(CC); attr.setInvalid(); return true; } // Also diagnose fastcall with regparm. if (fn->getHasRegParm()) { S.Diag(attr.getLoc(), diag::err_attributes_are_not_compatible) << "regparm" << FunctionType::getNameForCallConv(CC); attr.setInvalid(); return true; } } FunctionType::ExtInfo EI = unwrapped.get()->getExtInfo().withCallingConv(CC); type = unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI)); return true; } /// Handle OpenCL image access qualifiers: read_only, write_only, read_write static void HandleOpenCLImageAccessAttribute(QualType& CurType, const AttributeList &Attr, Sema &S) { // Check the attribute arguments. if (Attr.getNumArgs() != 1) { S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; Attr.setInvalid(); return; } Expr *sizeExpr = static_cast(Attr.getArg(0)); llvm::APSInt arg(32); if (sizeExpr->isTypeDependent() || sizeExpr->isValueDependent() || !sizeExpr->isIntegerConstantExpr(arg, S.Context)) { S.Diag(Attr.getLoc(), diag::err_attribute_argument_not_int) << "opencl_image_access" << sizeExpr->getSourceRange(); Attr.setInvalid(); return; } unsigned iarg = static_cast(arg.getZExtValue()); switch (iarg) { case CLIA_read_only: case CLIA_write_only: case CLIA_read_write: // Implemented in a separate patch break; default: // Implemented in a separate patch S.Diag(Attr.getLoc(), diag::err_attribute_invalid_size) << sizeExpr->getSourceRange(); Attr.setInvalid(); break; } } /// HandleVectorSizeAttribute - this attribute is only applicable to integral /// and float scalars, although arrays, pointers, and function return values are /// allowed in conjunction with this construct. Aggregates with this attribute /// are invalid, even if they are of the same size as a corresponding scalar. /// The raw attribute should contain precisely 1 argument, the vector size for /// the variable, measured in bytes. If curType and rawAttr are well formed, /// this routine will return a new vector type. static void HandleVectorSizeAttr(QualType& CurType, const AttributeList &Attr, Sema &S) { // Check the attribute arguments. if (Attr.getNumArgs() != 1) { S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; Attr.setInvalid(); return; } Expr *sizeExpr = static_cast(Attr.getArg(0)); llvm::APSInt vecSize(32); if (sizeExpr->isTypeDependent() || sizeExpr->isValueDependent() || !sizeExpr->isIntegerConstantExpr(vecSize, S.Context)) { S.Diag(Attr.getLoc(), diag::err_attribute_argument_not_int) << "vector_size" << sizeExpr->getSourceRange(); Attr.setInvalid(); return; } // the base type must be integer or float, and can't already be a vector. if (!CurType->isIntegerType() && !CurType->isRealFloatingType()) { S.Diag(Attr.getLoc(), diag::err_attribute_invalid_vector_type) << CurType; Attr.setInvalid(); return; } unsigned typeSize = static_cast(S.Context.getTypeSize(CurType)); // vecSize is specified in bytes - convert to bits. unsigned vectorSize = static_cast(vecSize.getZExtValue() * 8); // the vector size needs to be an integral multiple of the type size. if (vectorSize % typeSize) { S.Diag(Attr.getLoc(), diag::err_attribute_invalid_size) << sizeExpr->getSourceRange(); Attr.setInvalid(); return; } if (vectorSize == 0) { S.Diag(Attr.getLoc(), diag::err_attribute_zero_size) << sizeExpr->getSourceRange(); Attr.setInvalid(); return; } // Success! Instantiate the vector type, the number of elements is > 0, and // not required to be a power of 2, unlike GCC. CurType = S.Context.getVectorType(CurType, vectorSize/typeSize, VectorType::GenericVector); } /// \brief Process the OpenCL-like ext_vector_type attribute when it occurs on /// a type. static void HandleExtVectorTypeAttr(QualType &CurType, const AttributeList &Attr, Sema &S) { Expr *sizeExpr; // Special case where the argument is a template id. if (Attr.getParameterName()) { CXXScopeSpec SS; SourceLocation TemplateKWLoc; UnqualifiedId id; id.setIdentifier(Attr.getParameterName(), Attr.getLoc()); ExprResult Size = S.ActOnIdExpression(S.getCurScope(), SS, TemplateKWLoc, id, false, false); if (Size.isInvalid()) return; sizeExpr = Size.get(); } else { // check the attribute arguments. if (Attr.getNumArgs() != 1) { S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; return; } sizeExpr = Attr.getArg(0); } // Create the vector type. QualType T = S.BuildExtVectorType(CurType, sizeExpr, Attr.getLoc()); if (!T.isNull()) CurType = T; } /// HandleNeonVectorTypeAttr - The "neon_vector_type" and /// "neon_polyvector_type" attributes are used to create vector types that /// are mangled according to ARM's ABI. Otherwise, these types are identical /// to those created with the "vector_size" attribute. Unlike "vector_size" /// the argument to these Neon attributes is the number of vector elements, /// not the vector size in bytes. The vector width and element type must /// match one of the standard Neon vector types. static void HandleNeonVectorTypeAttr(QualType& CurType, const AttributeList &Attr, Sema &S, VectorType::VectorKind VecKind, const char *AttrName) { // Check the attribute arguments. if (Attr.getNumArgs() != 1) { S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; Attr.setInvalid(); return; } // The number of elements must be an ICE. Expr *numEltsExpr = static_cast(Attr.getArg(0)); llvm::APSInt numEltsInt(32); if (numEltsExpr->isTypeDependent() || numEltsExpr->isValueDependent() || !numEltsExpr->isIntegerConstantExpr(numEltsInt, S.Context)) { S.Diag(Attr.getLoc(), diag::err_attribute_argument_not_int) << AttrName << numEltsExpr->getSourceRange(); Attr.setInvalid(); return; } // Only certain element types are supported for Neon vectors. const BuiltinType* BTy = CurType->getAs(); if (!BTy || (VecKind == VectorType::NeonPolyVector && BTy->getKind() != BuiltinType::SChar && BTy->getKind() != BuiltinType::Short) || (BTy->getKind() != BuiltinType::SChar && BTy->getKind() != BuiltinType::UChar && BTy->getKind() != BuiltinType::Short && BTy->getKind() != BuiltinType::UShort && BTy->getKind() != BuiltinType::Int && BTy->getKind() != BuiltinType::UInt && BTy->getKind() != BuiltinType::LongLong && BTy->getKind() != BuiltinType::ULongLong && BTy->getKind() != BuiltinType::Float)) { S.Diag(Attr.getLoc(), diag::err_attribute_invalid_vector_type) <(S.Context.getTypeSize(CurType)); unsigned numElts = static_cast(numEltsInt.getZExtValue()); unsigned vecSize = typeSize * numElts; if (vecSize != 64 && vecSize != 128) { S.Diag(Attr.getLoc(), diag::err_attribute_bad_neon_vector_size) << CurType; Attr.setInvalid(); return; } CurType = S.Context.getVectorType(CurType, numElts, VecKind); } static void processTypeAttrs(TypeProcessingState &state, QualType &type, TypeAttrLocation TAL, AttributeList *attrs) { // Scan through and apply attributes to this type where it makes sense. Some // attributes (such as __address_space__, __vector_size__, etc) apply to the // type, but others can be present in the type specifiers even though they // apply to the decl. Here we apply type attributes and ignore the rest. AttributeList *next; do { AttributeList &attr = *attrs; next = attr.getNext(); // Skip attributes that were marked to be invalid. if (attr.isInvalid()) continue; if (attr.isCXX11Attribute()) { // [[gnu::...]] attributes are treated as declaration attributes, so may // not appertain to a DeclaratorChunk, even if we handle them as type // attributes. if (attr.getScopeName() && attr.getScopeName()->isStr("gnu")) { if (TAL == TAL_DeclChunk) { state.getSema().Diag(attr.getLoc(), diag::warn_cxx11_gnu_attribute_on_type) << attr.getName(); continue; } } else if (TAL != TAL_DeclChunk) { // Otherwise, only consider type processing for a C++11 attribute if // it's actually been applied to a type. continue; } } // If this is an attribute we can handle, do so now, // otherwise, add it to the FnAttrs list for rechaining. switch (attr.getKind()) { default: // A C++11 attribute on a declarator chunk must appertain to a type. if (attr.isCXX11Attribute() && TAL == TAL_DeclChunk) { state.getSema().Diag(attr.getLoc(), diag::err_attribute_not_type_attr) << attr.getName(); attr.setUsedAsTypeAttr(); } break; case AttributeList::UnknownAttribute: if (attr.isCXX11Attribute() && TAL == TAL_DeclChunk) state.getSema().Diag(attr.getLoc(), diag::warn_unknown_attribute_ignored) << attr.getName(); break; case AttributeList::IgnoredAttribute: break; case AttributeList::AT_MayAlias: // FIXME: This attribute needs to actually be handled, but if we ignore // it it breaks large amounts of Linux software. attr.setUsedAsTypeAttr(); break; case AttributeList::AT_AddressSpace: HandleAddressSpaceTypeAttribute(type, attr, state.getSema()); attr.setUsedAsTypeAttr(); break; OBJC_POINTER_TYPE_ATTRS_CASELIST: if (!handleObjCPointerTypeAttr(state, attr, type)) distributeObjCPointerTypeAttr(state, attr, type); attr.setUsedAsTypeAttr(); break; case AttributeList::AT_VectorSize: HandleVectorSizeAttr(type, attr, state.getSema()); attr.setUsedAsTypeAttr(); break; case AttributeList::AT_ExtVectorType: HandleExtVectorTypeAttr(type, attr, state.getSema()); attr.setUsedAsTypeAttr(); break; case AttributeList::AT_NeonVectorType: HandleNeonVectorTypeAttr(type, attr, state.getSema(), VectorType::NeonVector, "neon_vector_type"); attr.setUsedAsTypeAttr(); break; case AttributeList::AT_NeonPolyVectorType: HandleNeonVectorTypeAttr(type, attr, state.getSema(), VectorType::NeonPolyVector, "neon_polyvector_type"); attr.setUsedAsTypeAttr(); break; case AttributeList::AT_OpenCLImageAccess: HandleOpenCLImageAccessAttribute(type, attr, state.getSema()); attr.setUsedAsTypeAttr(); break; case AttributeList::AT_Win64: case AttributeList::AT_Ptr32: case AttributeList::AT_Ptr64: // FIXME: Don't ignore these. We have partial handling for them as // declaration attributes in SemaDeclAttr.cpp; that should be moved here. attr.setUsedAsTypeAttr(); break; case AttributeList::AT_NSReturnsRetained: if (!state.getSema().getLangOpts().ObjCAutoRefCount) break; // fallthrough into the function attrs FUNCTION_TYPE_ATTRS_CASELIST: attr.setUsedAsTypeAttr(); // Never process function type attributes as part of the // declaration-specifiers. if (TAL == TAL_DeclSpec) distributeFunctionTypeAttrFromDeclSpec(state, attr, type); // Otherwise, handle the possible delays. else if (!handleFunctionTypeAttr(state, attr, type)) distributeFunctionTypeAttr(state, attr, type); break; } } while ((attrs = next)); } /// \brief Ensure that the type of the given expression is complete. /// /// This routine checks whether the expression \p E has a complete type. If the /// expression refers to an instantiable construct, that instantiation is /// performed as needed to complete its type. Furthermore /// Sema::RequireCompleteType is called for the expression's type (or in the /// case of a reference type, the referred-to type). /// /// \param E The expression whose type is required to be complete. /// \param Diagnoser The object that will emit a diagnostic if the type is /// incomplete. /// /// \returns \c true if the type of \p E is incomplete and diagnosed, \c false /// otherwise. bool Sema::RequireCompleteExprType(Expr *E, TypeDiagnoser &Diagnoser){ QualType T = E->getType(); // Fast path the case where the type is already complete. if (!T->isIncompleteType()) return false; // Incomplete array types may be completed by the initializer attached to // their definitions. For static data members of class templates we need to // instantiate the definition to get this initializer and complete the type. if (T->isIncompleteArrayType()) { if (DeclRefExpr *DRE = dyn_cast(E->IgnoreParens())) { if (VarDecl *Var = dyn_cast(DRE->getDecl())) { if (Var->isStaticDataMember() && Var->getInstantiatedFromStaticDataMember()) { MemberSpecializationInfo *MSInfo = Var->getMemberSpecializationInfo(); assert(MSInfo && "Missing member specialization information?"); if (MSInfo->getTemplateSpecializationKind() != TSK_ExplicitSpecialization) { // If we don't already have a point of instantiation, this is it. if (MSInfo->getPointOfInstantiation().isInvalid()) { MSInfo->setPointOfInstantiation(E->getLocStart()); // This is a modification of an existing AST node. Notify // listeners. if (ASTMutationListener *L = getASTMutationListener()) L->StaticDataMemberInstantiated(Var); } InstantiateStaticDataMemberDefinition(E->getExprLoc(), Var); // Update the type to the newly instantiated definition's type both // here and within the expression. if (VarDecl *Def = Var->getDefinition()) { DRE->setDecl(Def); T = Def->getType(); DRE->setType(T); E->setType(T); } } // We still go on to try to complete the type independently, as it // may also require instantiations or diagnostics if it remains // incomplete. } } } } // FIXME: Are there other cases which require instantiating something other // than the type to complete the type of an expression? // Look through reference types and complete the referred type. if (const ReferenceType *Ref = T->getAs()) T = Ref->getPointeeType(); return RequireCompleteType(E->getExprLoc(), T, Diagnoser); } namespace { struct TypeDiagnoserDiag : Sema::TypeDiagnoser { unsigned DiagID; TypeDiagnoserDiag(unsigned DiagID) : Sema::TypeDiagnoser(DiagID == 0), DiagID(DiagID) {} virtual void diagnose(Sema &S, SourceLocation Loc, QualType T) { if (Suppressed) return; S.Diag(Loc, DiagID) << T; } }; } bool Sema::RequireCompleteExprType(Expr *E, unsigned DiagID) { TypeDiagnoserDiag Diagnoser(DiagID); return RequireCompleteExprType(E, Diagnoser); } /// @brief Ensure that the type T is a complete type. /// /// This routine checks whether the type @p T is complete in any /// context where a complete type is required. If @p T is a complete /// type, returns false. If @p T is a class template specialization, /// this routine then attempts to perform class template /// instantiation. If instantiation fails, or if @p T is incomplete /// and cannot be completed, issues the diagnostic @p diag (giving it /// the type @p T) and returns true. /// /// @param Loc The location in the source that the incomplete type /// diagnostic should refer to. /// /// @param T The type that this routine is examining for completeness. /// /// @returns @c true if @p T is incomplete and a diagnostic was emitted, /// @c false otherwise. bool Sema::RequireCompleteType(SourceLocation Loc, QualType T, TypeDiagnoser &Diagnoser) { // FIXME: Add this assertion to make sure we always get instantiation points. // assert(!Loc.isInvalid() && "Invalid location in RequireCompleteType"); // FIXME: Add this assertion to help us flush out problems with // checking for dependent types and type-dependent expressions. // // assert(!T->isDependentType() && // "Can't ask whether a dependent type is complete"); // If we have a complete type, we're done. NamedDecl *Def = 0; if (!T->isIncompleteType(&Def)) { // If we know about the definition but it is not visible, complain. if (!Diagnoser.Suppressed && Def && !LookupResult::isVisible(Def)) { // Suppress this error outside of a SFINAE context if we've already // emitted the error once for this type. There's no usefulness in // repeating the diagnostic. // FIXME: Add a Fix-It that imports the corresponding module or includes // the header. Module *Owner = Def->getOwningModule(); Diag(Loc, diag::err_module_private_definition) << T << Owner->getFullModuleName(); Diag(Def->getLocation(), diag::note_previous_definition); if (!isSFINAEContext()) { // Recover by implicitly importing this module. createImplicitModuleImport(Loc, Owner); } } return false; } const TagType *Tag = T->getAs(); const ObjCInterfaceType *IFace = 0; if (Tag) { // Avoid diagnosing invalid decls as incomplete. if (Tag->getDecl()->isInvalidDecl()) return true; // Give the external AST source a chance to complete the type. if (Tag->getDecl()->hasExternalLexicalStorage()) { Context.getExternalSource()->CompleteType(Tag->getDecl()); if (!Tag->isIncompleteType()) return false; } } else if ((IFace = T->getAs())) { // Avoid diagnosing invalid decls as incomplete. if (IFace->getDecl()->isInvalidDecl()) return true; // Give the external AST source a chance to complete the type. if (IFace->getDecl()->hasExternalLexicalStorage()) { Context.getExternalSource()->CompleteType(IFace->getDecl()); if (!IFace->isIncompleteType()) return false; } } // If we have a class template specialization or a class member of a // class template specialization, or an array with known size of such, // try to instantiate it. QualType MaybeTemplate = T; while (const ConstantArrayType *Array = Context.getAsConstantArrayType(MaybeTemplate)) MaybeTemplate = Array->getElementType(); if (const RecordType *Record = MaybeTemplate->getAs()) { if (ClassTemplateSpecializationDecl *ClassTemplateSpec = dyn_cast(Record->getDecl())) { if (ClassTemplateSpec->getSpecializationKind() == TSK_Undeclared) return InstantiateClassTemplateSpecialization(Loc, ClassTemplateSpec, TSK_ImplicitInstantiation, /*Complain=*/!Diagnoser.Suppressed); } else if (CXXRecordDecl *Rec = dyn_cast(Record->getDecl())) { CXXRecordDecl *Pattern = Rec->getInstantiatedFromMemberClass(); if (!Rec->isBeingDefined() && Pattern) { MemberSpecializationInfo *MSI = Rec->getMemberSpecializationInfo(); assert(MSI && "Missing member specialization information?"); // This record was instantiated from a class within a template. if (MSI->getTemplateSpecializationKind() != TSK_ExplicitSpecialization) return InstantiateClass(Loc, Rec, Pattern, getTemplateInstantiationArgs(Rec), TSK_ImplicitInstantiation, /*Complain=*/!Diagnoser.Suppressed); } } } if (Diagnoser.Suppressed) return true; // We have an incomplete type. Produce a diagnostic. Diagnoser.diagnose(*this, Loc, T); // If the type was a forward declaration of a class/struct/union // type, produce a note. if (Tag && !Tag->getDecl()->isInvalidDecl()) Diag(Tag->getDecl()->getLocation(), Tag->isBeingDefined() ? diag::note_type_being_defined : diag::note_forward_declaration) << QualType(Tag, 0); // If the Objective-C class was a forward declaration, produce a note. if (IFace && !IFace->getDecl()->isInvalidDecl()) Diag(IFace->getDecl()->getLocation(), diag::note_forward_class); return true; } bool Sema::RequireCompleteType(SourceLocation Loc, QualType T, unsigned DiagID) { TypeDiagnoserDiag Diagnoser(DiagID); return RequireCompleteType(Loc, T, Diagnoser); } /// \brief Get diagnostic %select index for tag kind for /// literal type diagnostic message. /// WARNING: Indexes apply to particular diagnostics only! /// /// \returns diagnostic %select index. static unsigned getLiteralDiagFromTagKind(TagTypeKind Tag) { switch (Tag) { case TTK_Struct: return 0; case TTK_Interface: return 1; case TTK_Class: return 2; default: llvm_unreachable("Invalid tag kind for literal type diagnostic!"); } } /// @brief Ensure that the type T is a literal type. /// /// This routine checks whether the type @p T is a literal type. If @p T is an /// incomplete type, an attempt is made to complete it. If @p T is a literal /// type, or @p AllowIncompleteType is true and @p T is an incomplete type, /// returns false. Otherwise, this routine issues the diagnostic @p PD (giving /// it the type @p T), along with notes explaining why the type is not a /// literal type, and returns true. /// /// @param Loc The location in the source that the non-literal type /// diagnostic should refer to. /// /// @param T The type that this routine is examining for literalness. /// /// @param Diagnoser Emits a diagnostic if T is not a literal type. /// /// @returns @c true if @p T is not a literal type and a diagnostic was emitted, /// @c false otherwise. bool Sema::RequireLiteralType(SourceLocation Loc, QualType T, TypeDiagnoser &Diagnoser) { assert(!T->isDependentType() && "type should not be dependent"); QualType ElemType = Context.getBaseElementType(T); RequireCompleteType(Loc, ElemType, 0); if (T->isLiteralType()) return false; if (Diagnoser.Suppressed) return true; Diagnoser.diagnose(*this, Loc, T); if (T->isVariableArrayType()) return true; const RecordType *RT = ElemType->getAs(); if (!RT) return true; const CXXRecordDecl *RD = cast(RT->getDecl()); // A partially-defined class type can't be a literal type, because a literal // class type must have a trivial destructor (which can't be checked until // the class definition is complete). if (!RD->isCompleteDefinition()) { RequireCompleteType(Loc, ElemType, diag::note_non_literal_incomplete, T); return true; } // If the class has virtual base classes, then it's not an aggregate, and // cannot have any constexpr constructors or a trivial default constructor, // so is non-literal. This is better to diagnose than the resulting absence // of constexpr constructors. if (RD->getNumVBases()) { Diag(RD->getLocation(), diag::note_non_literal_virtual_base) << getLiteralDiagFromTagKind(RD->getTagKind()) << RD->getNumVBases(); for (CXXRecordDecl::base_class_const_iterator I = RD->vbases_begin(), E = RD->vbases_end(); I != E; ++I) Diag(I->getLocStart(), diag::note_constexpr_virtual_base_here) << I->getSourceRange(); } else if (!RD->isAggregate() && !RD->hasConstexprNonCopyMoveConstructor() && !RD->hasTrivialDefaultConstructor()) { Diag(RD->getLocation(), diag::note_non_literal_no_constexpr_ctors) << RD; } else if (RD->hasNonLiteralTypeFieldsOrBases()) { for (CXXRecordDecl::base_class_const_iterator I = RD->bases_begin(), E = RD->bases_end(); I != E; ++I) { if (!I->getType()->isLiteralType()) { Diag(I->getLocStart(), diag::note_non_literal_base_class) << RD << I->getType() << I->getSourceRange(); return true; } } for (CXXRecordDecl::field_iterator I = RD->field_begin(), E = RD->field_end(); I != E; ++I) { if (!I->getType()->isLiteralType() || I->getType().isVolatileQualified()) { Diag(I->getLocation(), diag::note_non_literal_field) << RD << *I << I->getType() << I->getType().isVolatileQualified(); return true; } } } else if (!RD->hasTrivialDestructor()) { // All fields and bases are of literal types, so have trivial destructors. // If this class's destructor is non-trivial it must be user-declared. CXXDestructorDecl *Dtor = RD->getDestructor(); assert(Dtor && "class has literal fields and bases but no dtor?"); if (!Dtor) return true; Diag(Dtor->getLocation(), Dtor->isUserProvided() ? diag::note_non_literal_user_provided_dtor : diag::note_non_literal_nontrivial_dtor) << RD; if (!Dtor->isUserProvided()) SpecialMemberIsTrivial(Dtor, CXXDestructor, /*Diagnose*/true); } return true; } bool Sema::RequireLiteralType(SourceLocation Loc, QualType T, unsigned DiagID) { TypeDiagnoserDiag Diagnoser(DiagID); return RequireLiteralType(Loc, T, Diagnoser); } /// \brief Retrieve a version of the type 'T' that is elaborated by Keyword /// and qualified by the nested-name-specifier contained in SS. QualType Sema::getElaboratedType(ElaboratedTypeKeyword Keyword, const CXXScopeSpec &SS, QualType T) { if (T.isNull()) return T; NestedNameSpecifier *NNS; if (SS.isValid()) NNS = static_cast(SS.getScopeRep()); else { if (Keyword == ETK_None) return T; NNS = 0; } return Context.getElaboratedType(Keyword, NNS, T); } QualType Sema::BuildTypeofExprType(Expr *E, SourceLocation Loc) { ExprResult ER = CheckPlaceholderExpr(E); if (ER.isInvalid()) return QualType(); E = ER.take(); if (!E->isTypeDependent()) { QualType T = E->getType(); if (const TagType *TT = T->getAs()) DiagnoseUseOfDecl(TT->getDecl(), E->getExprLoc()); } return Context.getTypeOfExprType(E); } /// getDecltypeForExpr - Given an expr, will return the decltype for /// that expression, according to the rules in C++11 /// [dcl.type.simple]p4 and C++11 [expr.lambda.prim]p18. static QualType getDecltypeForExpr(Sema &S, Expr *E) { if (E->isTypeDependent()) return S.Context.DependentTy; // C++11 [dcl.type.simple]p4: // The type denoted by decltype(e) is defined as follows: // // - if e is an unparenthesized id-expression or an unparenthesized class // member access (5.2.5), decltype(e) is the type of the entity named // by e. If there is no such entity, or if e names a set of overloaded // functions, the program is ill-formed; // // We apply the same rules for Objective-C ivar and property references. if (const DeclRefExpr *DRE = dyn_cast(E)) { if (const ValueDecl *VD = dyn_cast(DRE->getDecl())) return VD->getType(); } else if (const MemberExpr *ME = dyn_cast(E)) { if (const FieldDecl *FD = dyn_cast(ME->getMemberDecl())) return FD->getType(); } else if (const ObjCIvarRefExpr *IR = dyn_cast(E)) { return IR->getDecl()->getType(); } else if (const ObjCPropertyRefExpr *PR = dyn_cast(E)) { if (PR->isExplicitProperty()) return PR->getExplicitProperty()->getType(); } // C++11 [expr.lambda.prim]p18: // Every occurrence of decltype((x)) where x is a possibly // parenthesized id-expression that names an entity of automatic // storage duration is treated as if x were transformed into an // access to a corresponding data member of the closure type that // would have been declared if x were an odr-use of the denoted // entity. using namespace sema; if (S.getCurLambda()) { if (isa(E)) { if (DeclRefExpr *DRE = dyn_cast(E->IgnoreParens())) { if (VarDecl *Var = dyn_cast(DRE->getDecl())) { QualType T = S.getCapturedDeclRefType(Var, DRE->getLocation()); if (!T.isNull()) return S.Context.getLValueReferenceType(T); } } } } // C++11 [dcl.type.simple]p4: // [...] QualType T = E->getType(); switch (E->getValueKind()) { // - otherwise, if e is an xvalue, decltype(e) is T&&, where T is the // type of e; case VK_XValue: T = S.Context.getRValueReferenceType(T); break; // - otherwise, if e is an lvalue, decltype(e) is T&, where T is the // type of e; case VK_LValue: T = S.Context.getLValueReferenceType(T); break; // - otherwise, decltype(e) is the type of e. case VK_RValue: break; } return T; } QualType Sema::BuildDecltypeType(Expr *E, SourceLocation Loc) { ExprResult ER = CheckPlaceholderExpr(E); if (ER.isInvalid()) return QualType(); E = ER.take(); return Context.getDecltypeType(E, getDecltypeForExpr(*this, E)); } QualType Sema::BuildUnaryTransformType(QualType BaseType, UnaryTransformType::UTTKind UKind, SourceLocation Loc) { switch (UKind) { case UnaryTransformType::EnumUnderlyingType: if (!BaseType->isDependentType() && !BaseType->isEnumeralType()) { Diag(Loc, diag::err_only_enums_have_underlying_types); return QualType(); } else { QualType Underlying = BaseType; if (!BaseType->isDependentType()) { EnumDecl *ED = BaseType->getAs()->getDecl(); assert(ED && "EnumType has no EnumDecl"); DiagnoseUseOfDecl(ED, Loc); Underlying = ED->getIntegerType(); } assert(!Underlying.isNull()); return Context.getUnaryTransformType(BaseType, Underlying, UnaryTransformType::EnumUnderlyingType); } } llvm_unreachable("unknown unary transform type"); } QualType Sema::BuildAtomicType(QualType T, SourceLocation Loc) { if (!T->isDependentType()) { // FIXME: It isn't entirely clear whether incomplete atomic types // are allowed or not; for simplicity, ban them for the moment. if (RequireCompleteType(Loc, T, diag::err_atomic_specifier_bad_type, 0)) return QualType(); int DisallowedKind = -1; if (T->isArrayType()) DisallowedKind = 1; else if (T->isFunctionType()) DisallowedKind = 2; else if (T->isReferenceType()) DisallowedKind = 3; else if (T->isAtomicType()) DisallowedKind = 4; else if (T.hasQualifiers()) DisallowedKind = 5; else if (!T.isTriviallyCopyableType(Context)) // Some other non-trivially-copyable type (probably a C++ class) DisallowedKind = 6; if (DisallowedKind != -1) { Diag(Loc, diag::err_atomic_specifier_bad_type) << DisallowedKind << T; return QualType(); } // FIXME: Do we need any handling for ARC here? } // Build the pointer type. return Context.getAtomicType(T); }