//===--- 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 "TypeLocBuilder.h" #include "clang/AST/ASTConsumer.h" #include "clang/AST/ASTContext.h" #include "clang/AST/ASTMutationListener.h" #include "clang/AST/ASTStructuralEquivalence.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/PartialDiagnostic.h" #include "clang/Basic/TargetInfo.h" #include "clang/Lex/Preprocessor.h" #include "clang/Sema/DeclSpec.h" #include "clang/Sema/DelayedDiagnostic.h" #include "clang/Sema/Lookup.h" #include "clang/Sema/ScopeInfo.h" #include "clang/Sema/SemaInternal.h" #include "clang/Sema/Template.h" #include "llvm/ADT/SmallPtrSet.h" #include "llvm/ADT/SmallString.h" #include "llvm/ADT/StringSwitch.h" #include "llvm/Support/ErrorHandling.h" using namespace clang; enum TypeDiagSelector { TDS_Function, TDS_Pointer, TDS_ObjCObjOrBlock }; /// 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() != DeclaratorContext::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) { TypeDiagSelector WhichType; bool useExpansionLoc = true; switch (attr.getKind()) { case AttributeList::AT_ObjCGC: WhichType = TDS_Pointer; break; case AttributeList::AT_ObjCOwnership: WhichType = TDS_ObjCObjOrBlock; break; default: // Assume everything else was a function attribute. WhichType = TDS_Function; useExpansionLoc = false; break; } SourceLocation loc = attr.getLoc(); StringRef name = attr.getName()->getName(); // The GC attributes are usually written with macros; special-case them. IdentifierInfo *II = attr.isArgIdent(0) ? attr.getArgAsIdent(0)->Ident : nullptr; if (useExpansionLoc && loc.isMacroID() && II) { if (II->isStr("strong")) { if (S.findMacroSpelling(loc, "__strong")) name = "__strong"; } else if (II->isStr("weak")) { if (S.findMacroSpelling(loc, "__weak")) name = "__weak"; } } S.Diag(loc, diag::warn_type_attribute_wrong_type) << name << WhichType << 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 // Calling convention attributes. #define CALLING_CONV_ATTRS_CASELIST \ case AttributeList::AT_CDecl: \ case AttributeList::AT_FastCall: \ case AttributeList::AT_StdCall: \ case AttributeList::AT_ThisCall: \ case AttributeList::AT_RegCall: \ case AttributeList::AT_Pascal: \ case AttributeList::AT_SwiftCall: \ case AttributeList::AT_VectorCall: \ case AttributeList::AT_MSABI: \ case AttributeList::AT_SysVABI: \ case AttributeList::AT_Pcs: \ case AttributeList::AT_IntelOclBicc: \ case AttributeList::AT_PreserveMost: \ case AttributeList::AT_PreserveAll // Function type attributes. #define FUNCTION_TYPE_ATTRS_CASELIST \ case AttributeList::AT_NSReturnsRetained: \ case AttributeList::AT_NoReturn: \ case AttributeList::AT_Regparm: \ case AttributeList::AT_AnyX86NoCallerSavedRegisters: \ CALLING_CONV_ATTRS_CASELIST // Microsoft-specific type qualifiers. #define MS_TYPE_ATTRS_CASELIST \ case AttributeList::AT_Ptr32: \ case AttributeList::AT_Ptr64: \ case AttributeList::AT_SPtr: \ case AttributeList::AT_UPtr // Nullability qualifiers. #define NULLABILITY_TYPE_ATTRS_CASELIST \ case AttributeList::AT_TypeNonNull: \ case AttributeList::AT_TypeNullable: \ case AttributeList::AT_TypeNullUnspecified 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 (auto *Attr : ignoredTypeAttrs) diagnoseBadTypeAttribute(getSema(), *Attr, 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(nullptr); 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(nullptr); } }; } // end anonymous namespace 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 handleMSPointerTypeQualifierAttr(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 /// /// \param onlyBlockPointers Whether we should only look into block /// pointer types (vs. all pointer types). static DeclaratorChunk *maybeMovePastReturnType(Declarator &declarator, unsigned i, bool onlyBlockPointers) { assert(i <= declarator.getNumTypeObjects()); DeclaratorChunk *result = nullptr; // 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: case DeclaratorChunk::Pipe: 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 &ptrChunk = declarator.getTypeObject(i-1); switch (ptrChunk.Kind) { case DeclaratorChunk::Paren: case DeclaratorChunk::Array: case DeclaratorChunk::Function: case DeclaratorChunk::Reference: case DeclaratorChunk::Pipe: continue; case DeclaratorChunk::MemberPointer: case DeclaratorChunk::Pointer: if (onlyBlockPointers) continue; LLVM_FALLTHROUGH; case DeclaratorChunk::BlockPointer: result = &ptrChunk; 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 = nullptr; if (state.isProcessingDeclSpec() && attr.getKind() == AttributeList::AT_ObjCOwnership) destChunk = maybeMovePastReturnType(declarator, i - 1, /*onlyBlockPointers=*/true); 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, /*onlyBlockPointers=*/true)) { moveAttrFromListToList(attr, state.getCurrentAttrListRef(), dest->getAttrListRef()); return; } } goto error; // Don't walk through these. case DeclaratorChunk::Reference: case DeclaratorChunk::MemberPointer: case DeclaratorChunk::Pipe: 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: case DeclaratorChunk::Pipe: 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: case DeclaratorChunk::Pipe: 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; } return handleFunctionTypeAttr(state, attr, declSpecType); } /// 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; FUNCTION_TYPE_ATTRS_CASELIST: distributeFunctionTypeAttrFromDeclarator(state, *attr, declSpecType); break; MS_TYPE_ATTRS_CASELIST: // Microsoft type attributes cannot go after the declarator-id. continue; NULLABILITY_TYPE_ATTRS_CASELIST: // Nullability specifiers cannot go after the declarator-id. // Objective-C __kindof does not get distributed. case AttributeList::AT_ObjCKindOf: continue; 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=*/nullptr, /*NumArgs=*/0, /*EllipsisLoc=*/NoLoc, /*RParenLoc=*/NoLoc, /*TypeQuals=*/0, /*RefQualifierIsLvalueRef=*/true, /*RefQualifierLoc=*/NoLoc, /*ConstQualifierLoc=*/NoLoc, /*VolatileQualifierLoc=*/NoLoc, /*RestrictQualifierLoc=*/NoLoc, /*MutableLoc=*/NoLoc, EST_None, /*ESpecRange=*/SourceRange(), /*Exceptions=*/nullptr, /*ExceptionRanges=*/nullptr, /*NumExceptions=*/0, /*NoexceptExpr=*/nullptr, /*ExceptionSpecTokens=*/nullptr, /*DeclsInPrototype=*/None, 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()); } static void diagnoseAndRemoveTypeQualifiers(Sema &S, const DeclSpec &DS, unsigned &TypeQuals, QualType TypeSoFar, unsigned RemoveTQs, unsigned DiagID) { // If this occurs outside a template instantiation, warn the user about // it; they probably didn't mean to specify a redundant qualifier. typedef std::pair QualLoc; for (QualLoc Qual : {QualLoc(DeclSpec::TQ_const, DS.getConstSpecLoc()), QualLoc(DeclSpec::TQ_restrict, DS.getRestrictSpecLoc()), QualLoc(DeclSpec::TQ_volatile, DS.getVolatileSpecLoc()), QualLoc(DeclSpec::TQ_atomic, DS.getAtomicSpecLoc())}) { if (!(RemoveTQs & Qual.first)) continue; if (!S.inTemplateInstantiation()) { if (TypeQuals & Qual.first) S.Diag(Qual.second, DiagID) << DeclSpec::getSpecifierName(Qual.first) << TypeSoFar << FixItHint::CreateRemoval(Qual.second); } TypeQuals &= ~Qual.first; } } /// Return true if this is omitted block return type. Also check type /// attributes and type qualifiers when returning true. static bool checkOmittedBlockReturnType(Sema &S, Declarator &declarator, QualType Result) { if (!isOmittedBlockReturnType(declarator)) return false; // Warn if we see type attributes for omitted return type on a block literal. AttributeList *&attrs = declarator.getMutableDeclSpec().getAttributes().getListRef(); AttributeList *prev = nullptr; for (AttributeList *cur = attrs; cur; cur = cur->getNext()) { AttributeList &attr = *cur; // Skip attributes that were marked to be invalid or non-type // attributes. if (attr.isInvalid() || !attr.isTypeAttr()) { prev = cur; continue; } S.Diag(attr.getLoc(), diag::warn_block_literal_attributes_on_omitted_return_type) << attr.getName(); // Remove cur from the list. if (prev) { prev->setNext(cur->getNext()); prev = cur; } else { attrs = cur->getNext(); } } // Warn if we see type qualifiers for omitted return type on a block literal. const DeclSpec &DS = declarator.getDeclSpec(); unsigned TypeQuals = DS.getTypeQualifiers(); diagnoseAndRemoveTypeQualifiers(S, DS, TypeQuals, Result, (unsigned)-1, diag::warn_block_literal_qualifiers_on_omitted_return_type); declarator.getMutableDeclSpec().ClearTypeQualifiers(); return true; } /// Apply Objective-C type arguments to the given type. static QualType applyObjCTypeArgs(Sema &S, SourceLocation loc, QualType type, ArrayRef typeArgs, SourceRange typeArgsRange, bool failOnError = false) { // We can only apply type arguments to an Objective-C class type. const auto *objcObjectType = type->getAs(); if (!objcObjectType || !objcObjectType->getInterface()) { S.Diag(loc, diag::err_objc_type_args_non_class) << type << typeArgsRange; if (failOnError) return QualType(); return type; } // The class type must be parameterized. ObjCInterfaceDecl *objcClass = objcObjectType->getInterface(); ObjCTypeParamList *typeParams = objcClass->getTypeParamList(); if (!typeParams) { S.Diag(loc, diag::err_objc_type_args_non_parameterized_class) << objcClass->getDeclName() << FixItHint::CreateRemoval(typeArgsRange); if (failOnError) return QualType(); return type; } // The type must not already be specialized. if (objcObjectType->isSpecialized()) { S.Diag(loc, diag::err_objc_type_args_specialized_class) << type << FixItHint::CreateRemoval(typeArgsRange); if (failOnError) return QualType(); return type; } // Check the type arguments. SmallVector finalTypeArgs; unsigned numTypeParams = typeParams->size(); bool anyPackExpansions = false; for (unsigned i = 0, n = typeArgs.size(); i != n; ++i) { TypeSourceInfo *typeArgInfo = typeArgs[i]; QualType typeArg = typeArgInfo->getType(); // Type arguments cannot have explicit qualifiers or nullability. // We ignore indirect sources of these, e.g. behind typedefs or // template arguments. if (TypeLoc qual = typeArgInfo->getTypeLoc().findExplicitQualifierLoc()) { bool diagnosed = false; SourceRange rangeToRemove; if (auto attr = qual.getAs()) { rangeToRemove = attr.getLocalSourceRange(); if (attr.getTypePtr()->getImmediateNullability()) { typeArg = attr.getTypePtr()->getModifiedType(); S.Diag(attr.getLocStart(), diag::err_objc_type_arg_explicit_nullability) << typeArg << FixItHint::CreateRemoval(rangeToRemove); diagnosed = true; } } if (!diagnosed) { S.Diag(qual.getLocStart(), diag::err_objc_type_arg_qualified) << typeArg << typeArg.getQualifiers().getAsString() << FixItHint::CreateRemoval(rangeToRemove); } } // Remove qualifiers even if they're non-local. typeArg = typeArg.getUnqualifiedType(); finalTypeArgs.push_back(typeArg); if (typeArg->getAs()) anyPackExpansions = true; // Find the corresponding type parameter, if there is one. ObjCTypeParamDecl *typeParam = nullptr; if (!anyPackExpansions) { if (i < numTypeParams) { typeParam = typeParams->begin()[i]; } else { // Too many arguments. S.Diag(loc, diag::err_objc_type_args_wrong_arity) << false << objcClass->getDeclName() << (unsigned)typeArgs.size() << numTypeParams; S.Diag(objcClass->getLocation(), diag::note_previous_decl) << objcClass; if (failOnError) return QualType(); return type; } } // Objective-C object pointer types must be substitutable for the bounds. if (const auto *typeArgObjC = typeArg->getAs()) { // If we don't have a type parameter to match against, assume // everything is fine. There was a prior pack expansion that // means we won't be able to match anything. if (!typeParam) { assert(anyPackExpansions && "Too many arguments?"); continue; } // Retrieve the bound. QualType bound = typeParam->getUnderlyingType(); const auto *boundObjC = bound->getAs(); // Determine whether the type argument is substitutable for the bound. if (typeArgObjC->isObjCIdType()) { // When the type argument is 'id', the only acceptable type // parameter bound is 'id'. if (boundObjC->isObjCIdType()) continue; } else if (S.Context.canAssignObjCInterfaces(boundObjC, typeArgObjC)) { // Otherwise, we follow the assignability rules. continue; } // Diagnose the mismatch. S.Diag(typeArgInfo->getTypeLoc().getLocStart(), diag::err_objc_type_arg_does_not_match_bound) << typeArg << bound << typeParam->getDeclName(); S.Diag(typeParam->getLocation(), diag::note_objc_type_param_here) << typeParam->getDeclName(); if (failOnError) return QualType(); return type; } // Block pointer types are permitted for unqualified 'id' bounds. if (typeArg->isBlockPointerType()) { // If we don't have a type parameter to match against, assume // everything is fine. There was a prior pack expansion that // means we won't be able to match anything. if (!typeParam) { assert(anyPackExpansions && "Too many arguments?"); continue; } // Retrieve the bound. QualType bound = typeParam->getUnderlyingType(); if (bound->isBlockCompatibleObjCPointerType(S.Context)) continue; // Diagnose the mismatch. S.Diag(typeArgInfo->getTypeLoc().getLocStart(), diag::err_objc_type_arg_does_not_match_bound) << typeArg << bound << typeParam->getDeclName(); S.Diag(typeParam->getLocation(), diag::note_objc_type_param_here) << typeParam->getDeclName(); if (failOnError) return QualType(); return type; } // Dependent types will be checked at instantiation time. if (typeArg->isDependentType()) { continue; } // Diagnose non-id-compatible type arguments. S.Diag(typeArgInfo->getTypeLoc().getLocStart(), diag::err_objc_type_arg_not_id_compatible) << typeArg << typeArgInfo->getTypeLoc().getSourceRange(); if (failOnError) return QualType(); return type; } // Make sure we didn't have the wrong number of arguments. if (!anyPackExpansions && finalTypeArgs.size() != numTypeParams) { S.Diag(loc, diag::err_objc_type_args_wrong_arity) << (typeArgs.size() < typeParams->size()) << objcClass->getDeclName() << (unsigned)finalTypeArgs.size() << (unsigned)numTypeParams; S.Diag(objcClass->getLocation(), diag::note_previous_decl) << objcClass; if (failOnError) return QualType(); return type; } // Success. Form the specialized type. return S.Context.getObjCObjectType(type, finalTypeArgs, { }, false); } QualType Sema::BuildObjCTypeParamType(const ObjCTypeParamDecl *Decl, SourceLocation ProtocolLAngleLoc, ArrayRef Protocols, ArrayRef ProtocolLocs, SourceLocation ProtocolRAngleLoc, bool FailOnError) { QualType Result = QualType(Decl->getTypeForDecl(), 0); if (!Protocols.empty()) { bool HasError; Result = Context.applyObjCProtocolQualifiers(Result, Protocols, HasError); if (HasError) { Diag(SourceLocation(), diag::err_invalid_protocol_qualifiers) << SourceRange(ProtocolLAngleLoc, ProtocolRAngleLoc); if (FailOnError) Result = QualType(); } if (FailOnError && Result.isNull()) return QualType(); } return Result; } QualType Sema::BuildObjCObjectType(QualType BaseType, SourceLocation Loc, SourceLocation TypeArgsLAngleLoc, ArrayRef TypeArgs, SourceLocation TypeArgsRAngleLoc, SourceLocation ProtocolLAngleLoc, ArrayRef Protocols, ArrayRef ProtocolLocs, SourceLocation ProtocolRAngleLoc, bool FailOnError) { QualType Result = BaseType; if (!TypeArgs.empty()) { Result = applyObjCTypeArgs(*this, Loc, Result, TypeArgs, SourceRange(TypeArgsLAngleLoc, TypeArgsRAngleLoc), FailOnError); if (FailOnError && Result.isNull()) return QualType(); } if (!Protocols.empty()) { bool HasError; Result = Context.applyObjCProtocolQualifiers(Result, Protocols, HasError); if (HasError) { Diag(Loc, diag::err_invalid_protocol_qualifiers) << SourceRange(ProtocolLAngleLoc, ProtocolRAngleLoc); if (FailOnError) Result = QualType(); } if (FailOnError && Result.isNull()) return QualType(); } return Result; } TypeResult Sema::actOnObjCProtocolQualifierType( SourceLocation lAngleLoc, ArrayRef protocols, ArrayRef protocolLocs, SourceLocation rAngleLoc) { // Form id. QualType Result = Context.getObjCObjectType( Context.ObjCBuiltinIdTy, { }, llvm::makeArrayRef( (ObjCProtocolDecl * const *)protocols.data(), protocols.size()), false); Result = Context.getObjCObjectPointerType(Result); TypeSourceInfo *ResultTInfo = Context.CreateTypeSourceInfo(Result); TypeLoc ResultTL = ResultTInfo->getTypeLoc(); auto ObjCObjectPointerTL = ResultTL.castAs(); ObjCObjectPointerTL.setStarLoc(SourceLocation()); // implicit auto ObjCObjectTL = ObjCObjectPointerTL.getPointeeLoc() .castAs(); ObjCObjectTL.setHasBaseTypeAsWritten(false); ObjCObjectTL.getBaseLoc().initialize(Context, SourceLocation()); // No type arguments. ObjCObjectTL.setTypeArgsLAngleLoc(SourceLocation()); ObjCObjectTL.setTypeArgsRAngleLoc(SourceLocation()); // Fill in protocol qualifiers. ObjCObjectTL.setProtocolLAngleLoc(lAngleLoc); ObjCObjectTL.setProtocolRAngleLoc(rAngleLoc); for (unsigned i = 0, n = protocols.size(); i != n; ++i) ObjCObjectTL.setProtocolLoc(i, protocolLocs[i]); // We're done. Return the completed type to the parser. return CreateParsedType(Result, ResultTInfo); } TypeResult Sema::actOnObjCTypeArgsAndProtocolQualifiers( Scope *S, SourceLocation Loc, ParsedType BaseType, SourceLocation TypeArgsLAngleLoc, ArrayRef TypeArgs, SourceLocation TypeArgsRAngleLoc, SourceLocation ProtocolLAngleLoc, ArrayRef Protocols, ArrayRef ProtocolLocs, SourceLocation ProtocolRAngleLoc) { TypeSourceInfo *BaseTypeInfo = nullptr; QualType T = GetTypeFromParser(BaseType, &BaseTypeInfo); if (T.isNull()) return true; // Handle missing type-source info. if (!BaseTypeInfo) BaseTypeInfo = Context.getTrivialTypeSourceInfo(T, Loc); // Extract type arguments. SmallVector ActualTypeArgInfos; for (unsigned i = 0, n = TypeArgs.size(); i != n; ++i) { TypeSourceInfo *TypeArgInfo = nullptr; QualType TypeArg = GetTypeFromParser(TypeArgs[i], &TypeArgInfo); if (TypeArg.isNull()) { ActualTypeArgInfos.clear(); break; } assert(TypeArgInfo && "No type source info?"); ActualTypeArgInfos.push_back(TypeArgInfo); } // Build the object type. QualType Result = BuildObjCObjectType( T, BaseTypeInfo->getTypeLoc().getSourceRange().getBegin(), TypeArgsLAngleLoc, ActualTypeArgInfos, TypeArgsRAngleLoc, ProtocolLAngleLoc, llvm::makeArrayRef((ObjCProtocolDecl * const *)Protocols.data(), Protocols.size()), ProtocolLocs, ProtocolRAngleLoc, /*FailOnError=*/false); if (Result == T) return BaseType; // Create source information for this type. TypeSourceInfo *ResultTInfo = Context.CreateTypeSourceInfo(Result); TypeLoc ResultTL = ResultTInfo->getTypeLoc(); // For id or Class, we'll have an // object pointer type. Fill in source information for it. if (auto ObjCObjectPointerTL = ResultTL.getAs()) { // The '*' is implicit. ObjCObjectPointerTL.setStarLoc(SourceLocation()); ResultTL = ObjCObjectPointerTL.getPointeeLoc(); } if (auto OTPTL = ResultTL.getAs()) { // Protocol qualifier information. if (OTPTL.getNumProtocols() > 0) { assert(OTPTL.getNumProtocols() == Protocols.size()); OTPTL.setProtocolLAngleLoc(ProtocolLAngleLoc); OTPTL.setProtocolRAngleLoc(ProtocolRAngleLoc); for (unsigned i = 0, n = Protocols.size(); i != n; ++i) OTPTL.setProtocolLoc(i, ProtocolLocs[i]); } // We're done. Return the completed type to the parser. return CreateParsedType(Result, ResultTInfo); } auto ObjCObjectTL = ResultTL.castAs(); // Type argument information. if (ObjCObjectTL.getNumTypeArgs() > 0) { assert(ObjCObjectTL.getNumTypeArgs() == ActualTypeArgInfos.size()); ObjCObjectTL.setTypeArgsLAngleLoc(TypeArgsLAngleLoc); ObjCObjectTL.setTypeArgsRAngleLoc(TypeArgsRAngleLoc); for (unsigned i = 0, n = ActualTypeArgInfos.size(); i != n; ++i) ObjCObjectTL.setTypeArgTInfo(i, ActualTypeArgInfos[i]); } else { ObjCObjectTL.setTypeArgsLAngleLoc(SourceLocation()); ObjCObjectTL.setTypeArgsRAngleLoc(SourceLocation()); } // Protocol qualifier information. if (ObjCObjectTL.getNumProtocols() > 0) { assert(ObjCObjectTL.getNumProtocols() == Protocols.size()); ObjCObjectTL.setProtocolLAngleLoc(ProtocolLAngleLoc); ObjCObjectTL.setProtocolRAngleLoc(ProtocolRAngleLoc); for (unsigned i = 0, n = Protocols.size(); i != n; ++i) ObjCObjectTL.setProtocolLoc(i, ProtocolLocs[i]); } else { ObjCObjectTL.setProtocolLAngleLoc(SourceLocation()); ObjCObjectTL.setProtocolRAngleLoc(SourceLocation()); } // Base type. ObjCObjectTL.setHasBaseTypeAsWritten(true); if (ObjCObjectTL.getType() == T) ObjCObjectTL.getBaseLoc().initializeFullCopy(BaseTypeInfo->getTypeLoc()); else ObjCObjectTL.getBaseLoc().initialize(Context, Loc); // We're done. Return the completed type to the parser. return CreateParsedType(Result, ResultTInfo); } static OpenCLAccessAttr::Spelling getImageAccess(const AttributeList *Attrs) { if (Attrs) { const AttributeList *Next = Attrs; do { const AttributeList &Attr = *Next; Next = Attr.getNext(); if (Attr.getKind() == AttributeList::AT_OpenCLAccess) { return static_cast( Attr.getSemanticSpelling()); } } while (Next); } return OpenCLAccessAttr::Keyword_read_only; } /// \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(), Context.getPrintingPolicy()); 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(), Context.getPrintingPolicy()); 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: // 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 (S.getLangOpts().CPlusPlus14 && declarator.getContext() == DeclaratorContext::LambdaExprContext) { // In C++1y, a lambda's implicit return type is 'auto'. Result = Context.getAutoDeductType(); break; } else if (declarator.getContext() == DeclaratorContext::LambdaExprContext || checkOmittedBlockReturnType(S, declarator, Context.DependentTy)) { 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." if (S.getLangOpts().CPlusPlus) { 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 if (S.getLangOpts().OpenCLVersion >= 200 && DS.isTypeSpecPipe()){ S.Diag(DeclLoc, diag::err_missing_actual_pipe_type) << DS.getSourceRange(); declarator.setInvalidType(true); } else { S.Diag(DeclLoc, diag::ext_missing_type_specifier) << DS.getSourceRange(); } } LLVM_FALLTHROUGH; 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.Context.getTargetInfo().hasInt128Type()) S.Diag(DS.getTypeSpecTypeLoc(), diag::err_type_unsupported) << "__int128"; if (DS.getTypeSpecSign() == DeclSpec::TSS_unsigned) Result = Context.UnsignedInt128Ty; else Result = Context.Int128Ty; break; case DeclSpec::TST_float16: Result = Context.Float16Ty; 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; break; case DeclSpec::TST_float128: if (!S.Context.getTargetInfo().hasFloat128Type()) S.Diag(DS.getTypeSpecTypeLoc(), diag::err_type_unsupported) << "__float128"; Result = Context.Float128Ty; break; case DeclSpec::TST_bool: Result = Context.BoolTy; break; // _Bool or bool break; 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); } // 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: Result = Context.getAutoType(QualType(), AutoTypeKeyword::Auto, false); break; case DeclSpec::TST_auto_type: Result = Context.getAutoType(QualType(), AutoTypeKeyword::GNUAutoType, false); break; case DeclSpec::TST_decltype_auto: Result = Context.getAutoType(QualType(), AutoTypeKeyword::DecltypeAuto, /*IsDependent*/ false); 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; #define GENERIC_IMAGE_TYPE(ImgType, Id) \ case DeclSpec::TST_##ImgType##_t: \ switch (getImageAccess(DS.getAttributes().getList())) { \ case OpenCLAccessAttr::Keyword_write_only: \ Result = Context.Id##WOTy; break; \ case OpenCLAccessAttr::Keyword_read_write: \ Result = Context.Id##RWTy; break; \ case OpenCLAccessAttr::Keyword_read_only: \ Result = Context.Id##ROTy; break; \ } \ break; #include "clang/Basic/OpenCLImageTypes.def" case DeclSpec::TST_error: Result = Context.IntTy; declarator.setInvalidType(true); break; } if (S.getLangOpts().OpenCL && S.checkOpenCLDisabledTypeDeclSpec(DS, Result)) declarator.setInvalidType(true); // 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() == DeclaratorContext::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. // pipe attributes will be handled later ( at GetFullTypeForDeclarator ) if (!DS.isTypeSpecPipe()) processTypeAttrs(state, Result, TAL_DeclSpec, DS.getAttributes().getList()); // Apply const/volatile/restrict qualifiers to T. if (unsigned TypeQuals = DS.getTypeQualifiers()) { // Warn about CV qualifiers on function types. // C99 6.7.3p8: // If the specification of a function type includes any type qualifiers, // the behavior is undefined. // C++11 [dcl.fct]p7: // The effect of a cv-qualifier-seq in a function declarator is not the // same as adding cv-qualification on top of the function type. In the // latter case, the cv-qualifiers are ignored. if (TypeQuals && Result->isFunctionType()) { diagnoseAndRemoveTypeQualifiers( S, DS, TypeQuals, Result, DeclSpec::TQ_const | DeclSpec::TQ_volatile, S.getLangOpts().CPlusPlus ? diag::warn_typecheck_function_qualifiers_ignored : diag::warn_typecheck_function_qualifiers_unspecified); // No diagnostic for 'restrict' or '_Atomic' applied to a // function type; we'll diagnose those later, in BuildQualifiedType. } // C++11 [dcl.ref]p1: // Cv-qualified references are ill-formed except when the // cv-qualifiers are introduced through the use of a typedef-name // or decltype-specifier, in which case the cv-qualifiers are ignored. // // There don't appear to be any other contexts in which a cv-qualified // reference type could be formed, so the 'ill-formed' clause here appears // to never happen. if (TypeQuals && Result->isReferenceType()) { diagnoseAndRemoveTypeQualifiers( S, DS, TypeQuals, Result, DeclSpec::TQ_const | DeclSpec::TQ_volatile | DeclSpec::TQ_atomic, diag::warn_typecheck_reference_qualifiers); } // 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; } assert(!Result.isNull() && "This function should not return a null type"); 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) { if (T.isNull()) return QualType(); // Ignore any attempt to form a cv-qualified reference. if (T->isReferenceType()) { Qs.removeConst(); Qs.removeVolatile(); } // 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 CVRAU, const DeclSpec *DS) { if (T.isNull()) return QualType(); // Ignore any attempt to form a cv-qualified reference. if (T->isReferenceType()) CVRAU &= ~(DeclSpec::TQ_const | DeclSpec::TQ_volatile | DeclSpec::TQ_atomic); // Convert from DeclSpec::TQ to Qualifiers::TQ by just dropping TQ_atomic and // TQ_unaligned; unsigned CVR = CVRAU & ~(DeclSpec::TQ_atomic | DeclSpec::TQ_unaligned); // 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 (CVRAU & 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); } Qualifiers Q = Qualifiers::fromCVRMask(CVR); Q.setUnaligned(CVRAU & DeclSpec::TQ_unaligned); return BuildQualifiedType(T, Loc, Q, 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); } 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; } namespace { /// Kinds of declarator that cannot contain a qualified function type. /// /// 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. /// /// Parens and member pointers are permitted. We don't diagnose array and /// function declarators, because they don't allow function types at all. /// /// The values of this enum are used in diagnostics. enum QualifiedFunctionKind { QFK_BlockPointer, QFK_Pointer, QFK_Reference }; } // end anonymous namespace /// Check whether the type T is a qualified function type, and if it is, /// diagnose that it cannot be contained within the given kind of declarator. static bool checkQualifiedFunction(Sema &S, QualType T, SourceLocation Loc, QualifiedFunctionKind QFK) { // Does T refer to a function type with a cv-qualifier or a ref-qualifier? const FunctionProtoType *FPT = T->getAs(); if (!FPT || (FPT->getTypeQuals() == 0 && FPT->getRefQualifier() == RQ_None)) return false; S.Diag(Loc, diag::err_compound_qualified_function_type) << QFK << isa(T.IgnoreParens()) << T << getFunctionQualifiersAsString(FPT); return true; } /// \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(); } if (T->isFunctionType() && getLangOpts().OpenCL) { Diag(Loc, diag::err_opencl_function_pointer); return QualType(); } if (checkQualifiedFunction(*this, T, Loc, QFK_Pointer)) 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(); } if (checkQualifiedFunction(*this, T, Loc, QFK_Reference)) 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); } /// \brief Build a Read-only Pipe type. /// /// \param T The type to which we'll be building a Pipe. /// /// \param Loc We do not use it for now. /// /// \returns A suitable pipe type, if there are no errors. Otherwise, returns a /// NULL type. QualType Sema::BuildReadPipeType(QualType T, SourceLocation Loc) { return Context.getReadPipeType(T); } /// \brief Build a Write-only Pipe type. /// /// \param T The type to which we'll be building a Pipe. /// /// \param Loc We do not use it for now. /// /// \returns A suitable pipe type, if there are no errors. Otherwise, returns a /// NULL type. QualType Sema::BuildWritePipeType(QualType T, SourceLocation Loc) { return Context.getWritePipeType(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) {} void diagnoseNotICE(Sema &S, SourceLocation Loc, SourceRange SR) override { } void diagnoseFold(Sema &S, SourceLocation Loc, SourceRange SR) override { S.Diag(Loc, diag::ext_vla_folded_to_constant) << SR; } } Diagnoser; return S.VerifyIntegerConstantExpression(ArraySize, &SizeVal, Diagnoser, S.LangOpts.GNUMode || S.LangOpts.OpenCL).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(); // Mentioning a member pointer type for an array type causes us to lock in // an inheritance model, even if it's inside an unused typedef. if (Context.getTargetInfo().getCXXABI().isMicrosoft()) if (const MemberPointerType *MPTy = T->getAs()) if (!MPTy->getClass()->isDependentType()) (void)isCompleteType(Loc, T); } 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 (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.get(); } // 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.get(); } // 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, nullptr, 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() && !T->isUndeducedType()) { // 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(); return QualType(); } } 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 (T->isVariableArrayType() && !Context.getTargetInfo().isVLASupported()) { if (getLangOpts().CUDA) { // CUDA device code doesn't support VLAs. CUDADiagIfDeviceCode(Loc, diag::err_cuda_vla) << CurrentCUDATarget(); } else if (!getLangOpts().OpenMP || shouldDiagnoseTargetSupportFromOpenMP()) { // Some targets don't support VLAs. Diag(Loc, diag::err_vla_unsupported); 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 VLAs during template argument deduction. 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); } // OpenCL v2.0 s6.12.5 - Arrays of blocks are not supported. // OpenCL v2.0 s6.16.13.1 - Arrays of pipe type are not supported. // OpenCL v2.0 s6.9.b - Arrays of image/sampler type are not supported. if (getLangOpts().OpenCL) { const QualType ArrType = Context.getBaseElementType(T); if (ArrType->isBlockPointerType() || ArrType->isPipeType() || ArrType->isSamplerT() || ArrType->isImageType()) { Diag(Loc, diag::err_opencl_invalid_type_array) << ArrType; return QualType(); } } 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.). // // Additionally, OpenCL prohibits vectors of booleans (they're considered a // reserved data type under OpenCL v2.0 s6.1.4), we don't support selects // on bitvectors, and we have no well-defined ABI for bitvectors, so vectors // of bool aren't allowed. if ((!T->isDependentType() && !T->isIntegerType() && !T->isRealFloatingType()) || T->isBooleanType()) { 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_type) << "ext_vector_type" << AANT_ArgumentIntegerConstant << 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(); } if (VectorType::isVectorSizeTooLarge(vectorSize)) { Diag(AttrLoc, diag::err_attribute_size_too_large) << ArraySize->getSourceRange(); return QualType(); } return Context.getExtVectorType(T, vectorSize); } return Context.getDependentSizedExtVectorType(T, ArraySize, AttrLoc); } bool Sema::CheckFunctionReturnType(QualType T, SourceLocation Loc) { if (T->isArrayType() || T->isFunctionType()) { Diag(Loc, diag::err_func_returning_array_function) << T->isFunctionType() << T; return true; } // Functions cannot return half FP. if (T->isHalfType() && !getLangOpts().HalfArgsAndReturns) { Diag(Loc, diag::err_parameters_retval_cannot_have_fp16_type) << 1 << FixItHint::CreateInsertion(Loc, "*"); return true; } // Methods cannot return interface types. All ObjC objects are // passed by reference. if (T->isObjCObjectType()) { Diag(Loc, diag::err_object_cannot_be_passed_returned_by_value) << 0 << T << FixItHint::CreateInsertion(Loc, "*"); return true; } return false; } /// Check the extended parameter information. Most of the necessary /// checking should occur when applying the parameter attribute; the /// only other checks required are positional restrictions. static void checkExtParameterInfos(Sema &S, ArrayRef paramTypes, const FunctionProtoType::ExtProtoInfo &EPI, llvm::function_ref getParamLoc) { assert(EPI.ExtParameterInfos && "shouldn't get here without param infos"); bool hasCheckedSwiftCall = false; auto checkForSwiftCC = [&](unsigned paramIndex) { // Only do this once. if (hasCheckedSwiftCall) return; hasCheckedSwiftCall = true; if (EPI.ExtInfo.getCC() == CC_Swift) return; S.Diag(getParamLoc(paramIndex), diag::err_swift_param_attr_not_swiftcall) << getParameterABISpelling(EPI.ExtParameterInfos[paramIndex].getABI()); }; for (size_t paramIndex = 0, numParams = paramTypes.size(); paramIndex != numParams; ++paramIndex) { switch (EPI.ExtParameterInfos[paramIndex].getABI()) { // Nothing interesting to check for orindary-ABI parameters. case ParameterABI::Ordinary: continue; // swift_indirect_result parameters must be a prefix of the function // arguments. case ParameterABI::SwiftIndirectResult: checkForSwiftCC(paramIndex); if (paramIndex != 0 && EPI.ExtParameterInfos[paramIndex - 1].getABI() != ParameterABI::SwiftIndirectResult) { S.Diag(getParamLoc(paramIndex), diag::err_swift_indirect_result_not_first); } continue; case ParameterABI::SwiftContext: checkForSwiftCC(paramIndex); continue; // swift_error parameters must be preceded by a swift_context parameter. case ParameterABI::SwiftErrorResult: checkForSwiftCC(paramIndex); if (paramIndex == 0 || EPI.ExtParameterInfos[paramIndex - 1].getABI() != ParameterABI::SwiftContext) { S.Diag(getParamLoc(paramIndex), diag::err_swift_error_result_not_after_swift_context); } continue; } llvm_unreachable("bad ABI kind"); } } QualType Sema::BuildFunctionType(QualType T, MutableArrayRef ParamTypes, SourceLocation Loc, DeclarationName Entity, const FunctionProtoType::ExtProtoInfo &EPI) { bool Invalid = false; Invalid |= CheckFunctionReturnType(T, Loc); 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() && !getLangOpts().HalfArgsAndReturns) { // Disallow half FP arguments. Diag(Loc, diag::err_parameters_retval_cannot_have_fp16_type) << 0 << FixItHint::CreateInsertion(Loc, "*"); Invalid = true; } ParamTypes[Idx] = ParamType; } if (EPI.ExtParameterInfos) { checkExtParameterInfos(*this, ParamTypes, EPI, [=](unsigned i) { return Loc; }); } if (EPI.ExtInfo.getProducesResult()) { // This is just a warning, so we can't fail to build if we see it. checkNSReturnsRetainedReturnType(Loc, T); } 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); return QualType(); } // 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) << getPrintableNameForEntity(Entity) << T; return QualType(); } if (T->isVoidType()) { Diag(Loc, diag::err_illegal_decl_mempointer_to_void) << getPrintableNameForEntity(Entity); return QualType(); } if (!Class->isDependentType() && !Class->isRecordType()) { Diag(Loc, diag::err_mempointer_in_nonclass_type) << Class; return QualType(); } // Adjust the default free function calling convention to the default method // calling convention. bool IsCtorOrDtor = (Entity.getNameKind() == DeclarationName::CXXConstructorName) || (Entity.getNameKind() == DeclarationName::CXXDestructorName); if (T->isFunctionType()) adjustMemberFunctionCC(T, /*IsStatic=*/false, IsCtorOrDtor, Loc); 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(); } if (checkQualifiedFunction(*this, T, Loc, QFK_BlockPointer)) return QualType(); return Context.getBlockPointerType(T); } QualType Sema::GetTypeFromParser(ParsedType Ty, TypeSourceInfo **TInfo) { QualType QT = Ty.get(); if (QT.isNull()) { if (TInfo) *TInfo = nullptr; return QualType(); } TypeSourceInfo *DI = nullptr; 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: case DeclaratorChunk::Pipe: 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? } void Sema::diagnoseIgnoredQualifiers(unsigned DiagID, unsigned Quals, SourceLocation FallbackLoc, SourceLocation ConstQualLoc, SourceLocation VolatileQualLoc, SourceLocation RestrictQualLoc, SourceLocation AtomicQualLoc, SourceLocation UnalignedQualLoc) { if (!Quals) return; struct Qual { const char *Name; unsigned Mask; SourceLocation Loc; } const QualKinds[5] = { { "const", DeclSpec::TQ_const, ConstQualLoc }, { "volatile", DeclSpec::TQ_volatile, VolatileQualLoc }, { "restrict", DeclSpec::TQ_restrict, RestrictQualLoc }, { "__unaligned", DeclSpec::TQ_unaligned, UnalignedQualLoc }, { "_Atomic", DeclSpec::TQ_atomic, AtomicQualLoc } }; SmallString<32> QualStr; unsigned NumQuals = 0; SourceLocation Loc; FixItHint FixIts[5]; // Build a string naming the redundant qualifiers. for (auto &E : QualKinds) { if (Quals & E.Mask) { if (!QualStr.empty()) QualStr += ' '; QualStr += E.Name; // If we have a location for the qualifier, offer a fixit. SourceLocation QualLoc = E.Loc; if (QualLoc.isValid()) { FixIts[NumQuals] = FixItHint::CreateRemoval(QualLoc); if (Loc.isInvalid() || getSourceManager().isBeforeInTranslationUnit(QualLoc, Loc)) Loc = QualLoc; } ++NumQuals; } } Diag(Loc.isInvalid() ? FallbackLoc : Loc, DiagID) << QualStr << NumQuals << FixIts[0] << FixIts[1] << FixIts[2] << FixIts[3]; } // Diagnose pointless type qualifiers on the return type of a function. static void diagnoseRedundantReturnTypeQualifiers(Sema &S, QualType RetTy, Declarator &D, unsigned FunctionChunkIndex) { if (D.getTypeObject(FunctionChunkIndex).Fun.hasTrailingReturnType()) { // FIXME: TypeSourceInfo doesn't preserve location information for // qualifiers. S.diagnoseIgnoredQualifiers(diag::warn_qual_return_type, 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; S.diagnoseIgnoredQualifiers( diag::warn_qual_return_type, PTI.TypeQuals, SourceLocation(), SourceLocation::getFromRawEncoding(PTI.ConstQualLoc), SourceLocation::getFromRawEncoding(PTI.VolatileQualLoc), SourceLocation::getFromRawEncoding(PTI.RestrictQualLoc), SourceLocation::getFromRawEncoding(PTI.AtomicQualLoc), SourceLocation::getFromRawEncoding(PTI.UnalignedQualLoc)); return; } case DeclaratorChunk::Function: case DeclaratorChunk::BlockPointer: case DeclaratorChunk::Reference: case DeclaratorChunk::Array: case DeclaratorChunk::MemberPointer: case DeclaratorChunk::Pipe: // 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; S.diagnoseIgnoredQualifiers(diag::warn_qual_return_type, 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() == UnqualifiedIdKind::IK_ConversionFunctionId) return; // Just parens all the way out to the decl specifiers. Diagnose any qualifiers // which are present there. S.diagnoseIgnoredQualifiers(diag::warn_qual_return_type, D.getDeclSpec().getTypeQualifiers(), D.getIdentifierLoc(), D.getDeclSpec().getConstSpecLoc(), D.getDeclSpec().getVolatileSpecLoc(), D.getDeclSpec().getRestrictSpecLoc(), D.getDeclSpec().getAtomicSpecLoc(), D.getDeclSpec().getUnalignedSpecLoc()); } static QualType GetDeclSpecTypeForDeclarator(TypeProcessingState &state, TypeSourceInfo *&ReturnTypeInfo) { Sema &SemaRef = state.getSema(); Declarator &D = state.getDeclarator(); QualType T; ReturnTypeInfo = nullptr; // The TagDecl owned by the DeclSpec. TagDecl *OwnedTagDecl = nullptr; switch (D.getName().getKind()) { case UnqualifiedIdKind::IK_ImplicitSelfParam: case UnqualifiedIdKind::IK_OperatorFunctionId: case UnqualifiedIdKind::IK_Identifier: case UnqualifiedIdKind::IK_LiteralOperatorId: case UnqualifiedIdKind::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 UnqualifiedIdKind::IK_ConstructorName: case UnqualifiedIdKind::IK_ConstructorTemplateId: case UnqualifiedIdKind::IK_DestructorName: // Constructors and destructors don't have return types. Use // "void" instead. T = SemaRef.Context.VoidTy; processTypeAttrs(state, T, TAL_DeclSpec, D.getDeclSpec().getAttributes().getList()); break; case UnqualifiedIdKind::IK_DeductionGuideName: // Deduction guides have a trailing return type and no type in their // decl-specifier sequence. Use a placeholder return type for now. T = SemaRef.Context.DependentTy; break; case UnqualifiedIdKind::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. if (DeducedType *Deduced = T->getContainedDeducedType()) { AutoType *Auto = dyn_cast(Deduced); int Error = -1; // Is this a 'auto' or 'decltype(auto)' type (as opposed to __auto_type or // class template argument deduction)? bool IsCXXAutoType = (Auto && Auto->getKeyword() != AutoTypeKeyword::GNUAutoType); switch (D.getContext()) { case DeclaratorContext::LambdaExprContext: // Declared return type of a lambda-declarator is implicit and is always // 'auto'. break; case DeclaratorContext::ObjCParameterContext: case DeclaratorContext::ObjCResultContext: case DeclaratorContext::PrototypeContext: Error = 0; break; case DeclaratorContext::LambdaExprParameterContext: // In C++14, generic lambdas allow 'auto' in their parameters. if (!SemaRef.getLangOpts().CPlusPlus14 || !Auto || Auto->getKeyword() != AutoTypeKeyword::Auto) Error = 16; else { // If auto is mentioned in a lambda parameter context, convert it to a // template parameter type. sema::LambdaScopeInfo *LSI = SemaRef.getCurLambda(); assert(LSI && "No LambdaScopeInfo on the stack!"); const unsigned TemplateParameterDepth = LSI->AutoTemplateParameterDepth; const unsigned AutoParameterPosition = LSI->AutoTemplateParams.size(); const bool IsParameterPack = D.hasEllipsis(); // Create the TemplateTypeParmDecl here to retrieve the corresponding // template parameter type. Template parameters are temporarily added // to the TU until the associated TemplateDecl is created. TemplateTypeParmDecl *CorrespondingTemplateParam = TemplateTypeParmDecl::Create( SemaRef.Context, SemaRef.Context.getTranslationUnitDecl(), /*KeyLoc*/SourceLocation(), /*NameLoc*/D.getLocStart(), TemplateParameterDepth, AutoParameterPosition, /*Identifier*/nullptr, false, IsParameterPack); LSI->AutoTemplateParams.push_back(CorrespondingTemplateParam); // Replace the 'auto' in the function parameter with this invented // template type parameter. // FIXME: Retain some type sugar to indicate that this was written // as 'auto'. T = SemaRef.ReplaceAutoType( T, QualType(CorrespondingTemplateParam->getTypeForDecl(), 0)); } break; case DeclaratorContext::MemberContext: { if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_static || D.isFunctionDeclarator()) break; bool Cxx = SemaRef.getLangOpts().CPlusPlus; switch (cast(SemaRef.CurContext)->getTagKind()) { case TTK_Enum: llvm_unreachable("unhandled tag kind"); case TTK_Struct: Error = Cxx ? 1 : 2; /* Struct member */ break; case TTK_Union: Error = Cxx ? 3 : 4; /* Union member */ break; case TTK_Class: Error = 5; /* Class member */ break; case TTK_Interface: Error = 6; /* Interface member */ break; } if (D.getDeclSpec().isFriendSpecified()) Error = 20; // Friend type break; } case DeclaratorContext::CXXCatchContext: case DeclaratorContext::ObjCCatchContext: Error = 7; // Exception declaration break; case DeclaratorContext::TemplateParamContext: if (isa(Deduced)) Error = 19; // Template parameter else if (!SemaRef.getLangOpts().CPlusPlus17) Error = 8; // Template parameter (until C++17) break; case DeclaratorContext::BlockLiteralContext: Error = 9; // Block literal break; case DeclaratorContext::TemplateTypeArgContext: Error = 10; // Template type argument break; case DeclaratorContext::AliasDeclContext: case DeclaratorContext::AliasTemplateContext: Error = 12; // Type alias break; case DeclaratorContext::TrailingReturnContext: if (!SemaRef.getLangOpts().CPlusPlus14 || !IsCXXAutoType) Error = 13; // Function return type break; case DeclaratorContext::ConversionIdContext: if (!SemaRef.getLangOpts().CPlusPlus14 || !IsCXXAutoType) Error = 14; // conversion-type-id break; case DeclaratorContext::FunctionalCastContext: if (isa(Deduced)) break; LLVM_FALLTHROUGH; case DeclaratorContext::TypeNameContext: Error = 15; // Generic break; case DeclaratorContext::FileContext: case DeclaratorContext::BlockContext: case DeclaratorContext::ForContext: case DeclaratorContext::InitStmtContext: case DeclaratorContext::ConditionContext: // FIXME: P0091R3 (erroneously) does not permit class template argument // deduction in conditions, for-init-statements, and other declarations // that are not simple-declarations. break; case DeclaratorContext::CXXNewContext: // FIXME: P0091R3 does not permit class template argument deduction here, // but we follow GCC and allow it anyway. if (!IsCXXAutoType && !isa(Deduced)) Error = 17; // 'new' type break; case DeclaratorContext::KNRTypeListContext: Error = 18; // K&R function parameter break; } if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) Error = 11; // In Objective-C it is an error to use 'auto' on a function declarator // (and everywhere for '__auto_type'). if (D.isFunctionDeclarator() && (!SemaRef.getLangOpts().CPlusPlus11 || !IsCXXAutoType)) Error = 13; bool HaveTrailing = false; // 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. // We don't support '__auto_type' with trailing return types. // FIXME: Should we only do this for 'auto' and not 'decltype(auto)'? if (SemaRef.getLangOpts().CPlusPlus11 && IsCXXAutoType && D.hasTrailingReturnType()) { HaveTrailing = true; Error = -1; } SourceRange AutoRange = D.getDeclSpec().getTypeSpecTypeLoc(); if (D.getName().getKind() == UnqualifiedIdKind::IK_ConversionFunctionId) AutoRange = D.getName().getSourceRange(); if (Error != -1) { unsigned Kind; if (Auto) { switch (Auto->getKeyword()) { case AutoTypeKeyword::Auto: Kind = 0; break; case AutoTypeKeyword::DecltypeAuto: Kind = 1; break; case AutoTypeKeyword::GNUAutoType: Kind = 2; break; } } else { assert(isa(Deduced) && "unknown auto type"); Kind = 3; } auto *DTST = dyn_cast(Deduced); TemplateName TN = DTST ? DTST->getTemplateName() : TemplateName(); SemaRef.Diag(AutoRange.getBegin(), diag::err_auto_not_allowed) << Kind << Error << (int)SemaRef.getTemplateNameKindForDiagnostics(TN) << QualType(Deduced, 0) << AutoRange; if (auto *TD = TN.getAsTemplateDecl()) SemaRef.Diag(TD->getLocation(), diag::note_template_decl_here); T = SemaRef.Context.IntTy; D.setInvalidType(true); } else if (!HaveTrailing) { // If there was a trailing return type, we already got // warn_cxx98_compat_trailing_return_type in the parser. SemaRef.Diag(AutoRange.getBegin(), diag::warn_cxx98_compat_auto_type_specifier) << AutoRange; } } 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. unsigned DiagID = 0; switch (D.getContext()) { case DeclaratorContext::TrailingReturnContext: // Class and enumeration definitions are syntactically not allowed in // trailing return types. llvm_unreachable("parser should not have allowed this"); break; case DeclaratorContext::FileContext: case DeclaratorContext::MemberContext: case DeclaratorContext::BlockContext: case DeclaratorContext::ForContext: case DeclaratorContext::InitStmtContext: case DeclaratorContext::BlockLiteralContext: case DeclaratorContext::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 DeclaratorContext::AliasDeclContext: break; case DeclaratorContext::AliasTemplateContext: DiagID = diag::err_type_defined_in_alias_template; break; case DeclaratorContext::TypeNameContext: case DeclaratorContext::FunctionalCastContext: case DeclaratorContext::ConversionIdContext: case DeclaratorContext::TemplateParamContext: case DeclaratorContext::CXXNewContext: case DeclaratorContext::CXXCatchContext: case DeclaratorContext::ObjCCatchContext: case DeclaratorContext::TemplateTypeArgContext: DiagID = diag::err_type_defined_in_type_specifier; break; case DeclaratorContext::PrototypeContext: case DeclaratorContext::LambdaExprParameterContext: case DeclaratorContext::ObjCParameterContext: case DeclaratorContext::ObjCResultContext: case DeclaratorContext::KNRTypeListContext: // C++ [dcl.fct]p6: // Types shall not be defined in return or parameter types. DiagID = diag::err_type_defined_in_param_type; break; case DeclaratorContext::ConditionContext: // C++ 6.4p2: // The type-specifier-seq shall not contain typedef and shall not declare // a new class or enumeration. DiagID = diag::err_type_defined_in_condition; break; } if (DiagID != 0) { SemaRef.Diag(OwnedTagDecl->getLocation(), DiagID) << SemaRef.Context.getTypeDeclType(OwnedTagDecl); D.setInvalidType(true); } } assert(!T.isNull() && "This function should not return a null type"); return T; } /// Produce an appropriate 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.NumParams > 1) return; // An initializer for a reference must have exactly one argument. if (RT->isReferenceType() && FTI.NumParams != 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() == DeclaratorContext::ConditionContext) return; SourceRange ParenRange(DeclType.Loc, DeclType.EndLoc); S.Diag(DeclType.Loc, FTI.NumParams ? 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(); Result.suppressDiagnostics(); } } if (FTI.NumParams > 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.Params[0].Param->getSourceRange(); SourceLocation B = Range.getBegin(); SourceLocation E = S.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, ParenRange.getBegin()); if (Init.empty() && S.LangOpts.CPlusPlus11) Init = "{}"; if (!Init.empty()) S.Diag(DeclType.Loc, diag::note_empty_parens_zero_initialize) << FixItHint::CreateReplacement(ParenRange, Init); } } } /// Produce an appropriate diagnostic for a declarator with top-level /// parentheses. static void warnAboutRedundantParens(Sema &S, Declarator &D, QualType T) { DeclaratorChunk &Paren = D.getTypeObject(D.getNumTypeObjects() - 1); assert(Paren.Kind == DeclaratorChunk::Paren && "do not have redundant top-level parentheses"); // This is a syntactic check; we're not interested in cases that arise // during template instantiation. if (S.inTemplateInstantiation()) return; // Check whether this could be intended to be a construction of a temporary // object in C++ via a function-style cast. bool CouldBeTemporaryObject = S.getLangOpts().CPlusPlus && D.isExpressionContext() && !D.isInvalidType() && D.getIdentifier() && D.getDeclSpec().getParsedSpecifiers() == DeclSpec::PQ_TypeSpecifier && (T->isRecordType() || T->isDependentType()) && D.getDeclSpec().getTypeQualifiers() == 0 && D.isFirstDeclarator(); bool StartsWithDeclaratorId = true; for (auto &C : D.type_objects()) { switch (C.Kind) { case DeclaratorChunk::Paren: if (&C == &Paren) continue; LLVM_FALLTHROUGH; case DeclaratorChunk::Pointer: StartsWithDeclaratorId = false; continue; case DeclaratorChunk::Array: if (!C.Arr.NumElts) CouldBeTemporaryObject = false; continue; case DeclaratorChunk::Reference: // FIXME: Suppress the warning here if there is no initializer; we're // going to give an error anyway. // We assume that something like 'T (&x) = y;' is highly likely to not // be intended to be a temporary object. CouldBeTemporaryObject = false; StartsWithDeclaratorId = false; continue; case DeclaratorChunk::Function: // In a new-type-id, function chunks require parentheses. if (D.getContext() == DeclaratorContext::CXXNewContext) return; // FIXME: "A(f())" deserves a vexing-parse warning, not just a // redundant-parens warning, but we don't know whether the function // chunk was syntactically valid as an expression here. CouldBeTemporaryObject = false; continue; case DeclaratorChunk::BlockPointer: case DeclaratorChunk::MemberPointer: case DeclaratorChunk::Pipe: // These cannot appear in expressions. CouldBeTemporaryObject = false; StartsWithDeclaratorId = false; continue; } } // FIXME: If there is an initializer, assume that this is not intended to be // a construction of a temporary object. // Check whether the name has already been declared; if not, this is not a // function-style cast. if (CouldBeTemporaryObject) { LookupResult Result(S, D.getIdentifier(), SourceLocation(), Sema::LookupOrdinaryName); if (!S.LookupName(Result, S.getCurScope())) CouldBeTemporaryObject = false; Result.suppressDiagnostics(); } SourceRange ParenRange(Paren.Loc, Paren.EndLoc); if (!CouldBeTemporaryObject) { // If we have A (::B), the parentheses affect the meaning of the program. // Suppress the warning in that case. Don't bother looking at the DeclSpec // here: even (e.g.) "int ::x" is visually ambiguous even though it's // formally unambiguous. if (StartsWithDeclaratorId && D.getCXXScopeSpec().isValid()) { for (NestedNameSpecifier *NNS = D.getCXXScopeSpec().getScopeRep(); NNS; NNS = NNS->getPrefix()) { if (NNS->getKind() == NestedNameSpecifier::Global) return; } } S.Diag(Paren.Loc, diag::warn_redundant_parens_around_declarator) << ParenRange << FixItHint::CreateRemoval(Paren.Loc) << FixItHint::CreateRemoval(Paren.EndLoc); return; } S.Diag(Paren.Loc, diag::warn_parens_disambiguated_as_variable_declaration) << ParenRange << D.getIdentifier(); auto *RD = T->getAsCXXRecordDecl(); if (!RD || !RD->hasDefinition() || RD->hasNonTrivialDestructor()) S.Diag(Paren.Loc, diag::note_raii_guard_add_name) << FixItHint::CreateInsertion(Paren.Loc, " varname") << T << D.getIdentifier(); // FIXME: A cast to void is probably a better suggestion in cases where it's // valid (when there is no initializer and we're not in a condition). S.Diag(D.getLocStart(), diag::note_function_style_cast_add_parentheses) << FixItHint::CreateInsertion(D.getLocStart(), "(") << FixItHint::CreateInsertion(S.getLocForEndOfToken(D.getLocEnd()), ")"); S.Diag(Paren.Loc, diag::note_remove_parens_for_variable_declaration) << FixItHint::CreateRemoval(Paren.Loc) << FixItHint::CreateRemoval(Paren.EndLoc); } /// Helper for figuring out the default CC for a function declarator type. If /// this is the outermost chunk, then we can determine the CC from the /// declarator context. If not, then this could be either a member function /// type or normal function type. static CallingConv getCCForDeclaratorChunk(Sema &S, Declarator &D, const DeclaratorChunk::FunctionTypeInfo &FTI, unsigned ChunkIndex) { assert(D.getTypeObject(ChunkIndex).Kind == DeclaratorChunk::Function); // Check for an explicit CC attribute. for (auto Attr = FTI.AttrList; Attr; Attr = Attr->getNext()) { switch (Attr->getKind()) { CALLING_CONV_ATTRS_CASELIST: { // Ignore attributes that don't validate or can't apply to the // function type. We'll diagnose the failure to apply them in // handleFunctionTypeAttr. CallingConv CC; if (!S.CheckCallingConvAttr(*Attr, CC) && (!FTI.isVariadic || supportsVariadicCall(CC))) { return CC; } break; } default: break; } } bool IsCXXInstanceMethod = false; if (S.getLangOpts().CPlusPlus) { // Look inwards through parentheses to see if this chunk will form a // member pointer type or if we're the declarator. Any type attributes // between here and there will override the CC we choose here. unsigned I = ChunkIndex; bool FoundNonParen = false; while (I && !FoundNonParen) { --I; if (D.getTypeObject(I).Kind != DeclaratorChunk::Paren) FoundNonParen = true; } if (FoundNonParen) { // If we're not the declarator, we're a regular function type unless we're // in a member pointer. IsCXXInstanceMethod = D.getTypeObject(I).Kind == DeclaratorChunk::MemberPointer; } else if (D.getContext() == DeclaratorContext::LambdaExprContext) { // This can only be a call operator for a lambda, which is an instance // method. IsCXXInstanceMethod = true; } else { // We're the innermost decl chunk, so must be a function declarator. assert(D.isFunctionDeclarator()); // If we're inside a record, we're declaring a method, but it could be // explicitly or implicitly static. IsCXXInstanceMethod = D.isFirstDeclarationOfMember() && D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && !D.isStaticMember(); } } CallingConv CC = S.Context.getDefaultCallingConvention(FTI.isVariadic, IsCXXInstanceMethod); // Attribute AT_OpenCLKernel affects the calling convention for SPIR // and AMDGPU targets, hence it cannot be treated as a calling // convention attribute. This is the simplest place to infer // calling convention for OpenCL kernels. if (S.getLangOpts().OpenCL) { for (const AttributeList *Attr = D.getDeclSpec().getAttributes().getList(); Attr; Attr = Attr->getNext()) { if (Attr->getKind() == AttributeList::AT_OpenCLKernel) { CC = CC_OpenCLKernel; break; } } } return CC; } namespace { /// A simple notion of pointer kinds, which matches up with the various /// pointer declarators. enum class SimplePointerKind { Pointer, BlockPointer, MemberPointer, Array, }; } // end anonymous namespace IdentifierInfo *Sema::getNullabilityKeyword(NullabilityKind nullability) { switch (nullability) { case NullabilityKind::NonNull: if (!Ident__Nonnull) Ident__Nonnull = PP.getIdentifierInfo("_Nonnull"); return Ident__Nonnull; case NullabilityKind::Nullable: if (!Ident__Nullable) Ident__Nullable = PP.getIdentifierInfo("_Nullable"); return Ident__Nullable; case NullabilityKind::Unspecified: if (!Ident__Null_unspecified) Ident__Null_unspecified = PP.getIdentifierInfo("_Null_unspecified"); return Ident__Null_unspecified; } llvm_unreachable("Unknown nullability kind."); } /// Retrieve the identifier "NSError". IdentifierInfo *Sema::getNSErrorIdent() { if (!Ident_NSError) Ident_NSError = PP.getIdentifierInfo("NSError"); return Ident_NSError; } /// Check whether there is a nullability attribute of any kind in the given /// attribute list. static bool hasNullabilityAttr(const AttributeList *attrs) { for (const AttributeList *attr = attrs; attr; attr = attr->getNext()) { if (attr->getKind() == AttributeList::AT_TypeNonNull || attr->getKind() == AttributeList::AT_TypeNullable || attr->getKind() == AttributeList::AT_TypeNullUnspecified) return true; } return false; } namespace { /// Describes the kind of a pointer a declarator describes. enum class PointerDeclaratorKind { // Not a pointer. NonPointer, // Single-level pointer. SingleLevelPointer, // Multi-level pointer (of any pointer kind). MultiLevelPointer, // CFFooRef* MaybePointerToCFRef, // CFErrorRef* CFErrorRefPointer, // NSError** NSErrorPointerPointer, }; /// Describes a declarator chunk wrapping a pointer that marks inference as /// unexpected. // These values must be kept in sync with diagnostics. enum class PointerWrappingDeclaratorKind { /// Pointer is top-level. None = -1, /// Pointer is an array element. Array = 0, /// Pointer is the referent type of a C++ reference. Reference = 1 }; } // end anonymous namespace /// Classify the given declarator, whose type-specified is \c type, based on /// what kind of pointer it refers to. /// /// This is used to determine the default nullability. static PointerDeclaratorKind classifyPointerDeclarator(Sema &S, QualType type, Declarator &declarator, PointerWrappingDeclaratorKind &wrappingKind) { unsigned numNormalPointers = 0; // For any dependent type, we consider it a non-pointer. if (type->isDependentType()) return PointerDeclaratorKind::NonPointer; // Look through the declarator chunks to identify pointers. for (unsigned i = 0, n = declarator.getNumTypeObjects(); i != n; ++i) { DeclaratorChunk &chunk = declarator.getTypeObject(i); switch (chunk.Kind) { case DeclaratorChunk::Array: if (numNormalPointers == 0) wrappingKind = PointerWrappingDeclaratorKind::Array; break; case DeclaratorChunk::Function: case DeclaratorChunk::Pipe: break; case DeclaratorChunk::BlockPointer: case DeclaratorChunk::MemberPointer: return numNormalPointers > 0 ? PointerDeclaratorKind::MultiLevelPointer : PointerDeclaratorKind::SingleLevelPointer; case DeclaratorChunk::Paren: break; case DeclaratorChunk::Reference: if (numNormalPointers == 0) wrappingKind = PointerWrappingDeclaratorKind::Reference; break; case DeclaratorChunk::Pointer: ++numNormalPointers; if (numNormalPointers > 2) return PointerDeclaratorKind::MultiLevelPointer; break; } } // Then, dig into the type specifier itself. unsigned numTypeSpecifierPointers = 0; do { // Decompose normal pointers. if (auto ptrType = type->getAs()) { ++numNormalPointers; if (numNormalPointers > 2) return PointerDeclaratorKind::MultiLevelPointer; type = ptrType->getPointeeType(); ++numTypeSpecifierPointers; continue; } // Decompose block pointers. if (type->getAs()) { return numNormalPointers > 0 ? PointerDeclaratorKind::MultiLevelPointer : PointerDeclaratorKind::SingleLevelPointer; } // Decompose member pointers. if (type->getAs()) { return numNormalPointers > 0 ? PointerDeclaratorKind::MultiLevelPointer : PointerDeclaratorKind::SingleLevelPointer; } // Look at Objective-C object pointers. if (auto objcObjectPtr = type->getAs()) { ++numNormalPointers; ++numTypeSpecifierPointers; // If this is NSError**, report that. if (auto objcClassDecl = objcObjectPtr->getInterfaceDecl()) { if (objcClassDecl->getIdentifier() == S.getNSErrorIdent() && numNormalPointers == 2 && numTypeSpecifierPointers < 2) { return PointerDeclaratorKind::NSErrorPointerPointer; } } break; } // Look at Objective-C class types. if (auto objcClass = type->getAs()) { if (objcClass->getInterface()->getIdentifier() == S.getNSErrorIdent()) { if (numNormalPointers == 2 && numTypeSpecifierPointers < 2) return PointerDeclaratorKind::NSErrorPointerPointer; } break; } // If at this point we haven't seen a pointer, we won't see one. if (numNormalPointers == 0) return PointerDeclaratorKind::NonPointer; if (auto recordType = type->getAs()) { RecordDecl *recordDecl = recordType->getDecl(); bool isCFError = false; if (S.CFError) { // If we already know about CFError, test it directly. isCFError = (S.CFError == recordDecl); } else { // Check whether this is CFError, which we identify based on its bridge // to NSError. CFErrorRef used to be declared with "objc_bridge" but is // now declared with "objc_bridge_mutable", so look for either one of // the two attributes. if (recordDecl->getTagKind() == TTK_Struct && numNormalPointers > 0) { IdentifierInfo *bridgedType = nullptr; if (auto bridgeAttr = recordDecl->getAttr()) bridgedType = bridgeAttr->getBridgedType(); else if (auto bridgeAttr = recordDecl->getAttr()) bridgedType = bridgeAttr->getBridgedType(); if (bridgedType == S.getNSErrorIdent()) { S.CFError = recordDecl; isCFError = true; } } } // If this is CFErrorRef*, report it as such. if (isCFError && numNormalPointers == 2 && numTypeSpecifierPointers < 2) { return PointerDeclaratorKind::CFErrorRefPointer; } break; } break; } while (true); switch (numNormalPointers) { case 0: return PointerDeclaratorKind::NonPointer; case 1: return PointerDeclaratorKind::SingleLevelPointer; case 2: return PointerDeclaratorKind::MaybePointerToCFRef; default: return PointerDeclaratorKind::MultiLevelPointer; } } static FileID getNullabilityCompletenessCheckFileID(Sema &S, SourceLocation loc) { // If we're anywhere in a function, method, or closure context, don't perform // completeness checks. for (DeclContext *ctx = S.CurContext; ctx; ctx = ctx->getParent()) { if (ctx->isFunctionOrMethod()) return FileID(); if (ctx->isFileContext()) break; } // We only care about the expansion location. loc = S.SourceMgr.getExpansionLoc(loc); FileID file = S.SourceMgr.getFileID(loc); if (file.isInvalid()) return FileID(); // Retrieve file information. bool invalid = false; const SrcMgr::SLocEntry &sloc = S.SourceMgr.getSLocEntry(file, &invalid); if (invalid || !sloc.isFile()) return FileID(); // We don't want to perform completeness checks on the main file or in // system headers. const SrcMgr::FileInfo &fileInfo = sloc.getFile(); if (fileInfo.getIncludeLoc().isInvalid()) return FileID(); if (fileInfo.getFileCharacteristic() != SrcMgr::C_User && S.Diags.getSuppressSystemWarnings()) { return FileID(); } return file; } /// Creates a fix-it to insert a C-style nullability keyword at \p pointerLoc, /// taking into account whitespace before and after. static void fixItNullability(Sema &S, DiagnosticBuilder &Diag, SourceLocation PointerLoc, NullabilityKind Nullability) { assert(PointerLoc.isValid()); if (PointerLoc.isMacroID()) return; SourceLocation FixItLoc = S.getLocForEndOfToken(PointerLoc); if (!FixItLoc.isValid() || FixItLoc == PointerLoc) return; const char *NextChar = S.SourceMgr.getCharacterData(FixItLoc); if (!NextChar) return; SmallString<32> InsertionTextBuf{" "}; InsertionTextBuf += getNullabilitySpelling(Nullability); InsertionTextBuf += " "; StringRef InsertionText = InsertionTextBuf.str(); if (isWhitespace(*NextChar)) { InsertionText = InsertionText.drop_back(); } else if (NextChar[-1] == '[') { if (NextChar[0] == ']') InsertionText = InsertionText.drop_back().drop_front(); else InsertionText = InsertionText.drop_front(); } else if (!isIdentifierBody(NextChar[0], /*allow dollar*/true) && !isIdentifierBody(NextChar[-1], /*allow dollar*/true)) { InsertionText = InsertionText.drop_back().drop_front(); } Diag << FixItHint::CreateInsertion(FixItLoc, InsertionText); } static void emitNullabilityConsistencyWarning(Sema &S, SimplePointerKind PointerKind, SourceLocation PointerLoc, SourceLocation PointerEndLoc) { assert(PointerLoc.isValid()); if (PointerKind == SimplePointerKind::Array) { S.Diag(PointerLoc, diag::warn_nullability_missing_array); } else { S.Diag(PointerLoc, diag::warn_nullability_missing) << static_cast(PointerKind); } auto FixItLoc = PointerEndLoc.isValid() ? PointerEndLoc : PointerLoc; if (FixItLoc.isMacroID()) return; auto addFixIt = [&](NullabilityKind Nullability) { auto Diag = S.Diag(FixItLoc, diag::note_nullability_fix_it); Diag << static_cast(Nullability); Diag << static_cast(PointerKind); fixItNullability(S, Diag, FixItLoc, Nullability); }; addFixIt(NullabilityKind::Nullable); addFixIt(NullabilityKind::NonNull); } /// Complains about missing nullability if the file containing \p pointerLoc /// has other uses of nullability (either the keywords or the \c assume_nonnull /// pragma). /// /// If the file has \e not seen other uses of nullability, this particular /// pointer is saved for possible later diagnosis. See recordNullabilitySeen(). static void checkNullabilityConsistency(Sema &S, SimplePointerKind pointerKind, SourceLocation pointerLoc, SourceLocation pointerEndLoc = SourceLocation()) { // Determine which file we're performing consistency checking for. FileID file = getNullabilityCompletenessCheckFileID(S, pointerLoc); if (file.isInvalid()) return; // If we haven't seen any type nullability in this file, we won't warn now // about anything. FileNullability &fileNullability = S.NullabilityMap[file]; if (!fileNullability.SawTypeNullability) { // If this is the first pointer declarator in the file, and the appropriate // warning is on, record it in case we need to diagnose it retroactively. diag::kind diagKind; if (pointerKind == SimplePointerKind::Array) diagKind = diag::warn_nullability_missing_array; else diagKind = diag::warn_nullability_missing; if (fileNullability.PointerLoc.isInvalid() && !S.Context.getDiagnostics().isIgnored(diagKind, pointerLoc)) { fileNullability.PointerLoc = pointerLoc; fileNullability.PointerEndLoc = pointerEndLoc; fileNullability.PointerKind = static_cast(pointerKind); } return; } // Complain about missing nullability. emitNullabilityConsistencyWarning(S, pointerKind, pointerLoc, pointerEndLoc); } /// Marks that a nullability feature has been used in the file containing /// \p loc. /// /// If this file already had pointer types in it that were missing nullability, /// the first such instance is retroactively diagnosed. /// /// \sa checkNullabilityConsistency static void recordNullabilitySeen(Sema &S, SourceLocation loc) { FileID file = getNullabilityCompletenessCheckFileID(S, loc); if (file.isInvalid()) return; FileNullability &fileNullability = S.NullabilityMap[file]; if (fileNullability.SawTypeNullability) return; fileNullability.SawTypeNullability = true; // If we haven't seen any type nullability before, now we have. Retroactively // diagnose the first unannotated pointer, if there was one. if (fileNullability.PointerLoc.isInvalid()) return; auto kind = static_cast(fileNullability.PointerKind); emitNullabilityConsistencyWarning(S, kind, fileNullability.PointerLoc, fileNullability.PointerEndLoc); } /// Returns true if any of the declarator chunks before \p endIndex include a /// level of indirection: array, pointer, reference, or pointer-to-member. /// /// Because declarator chunks are stored in outer-to-inner order, testing /// every chunk before \p endIndex is testing all chunks that embed the current /// chunk as part of their type. /// /// It is legal to pass the result of Declarator::getNumTypeObjects() as the /// end index, in which case all chunks are tested. static bool hasOuterPointerLikeChunk(const Declarator &D, unsigned endIndex) { unsigned i = endIndex; while (i != 0) { // Walk outwards along the declarator chunks. --i; const DeclaratorChunk &DC = D.getTypeObject(i); switch (DC.Kind) { case DeclaratorChunk::Paren: break; case DeclaratorChunk::Array: case DeclaratorChunk::Pointer: case DeclaratorChunk::Reference: case DeclaratorChunk::MemberPointer: return true; case DeclaratorChunk::Function: case DeclaratorChunk::BlockPointer: case DeclaratorChunk::Pipe: // These are invalid anyway, so just ignore. break; } } return false; } static TypeSourceInfo *GetFullTypeForDeclarator(TypeProcessingState &state, QualType declSpecType, TypeSourceInfo *TInfo) { // The TypeSourceInfo that this function returns will not be a null type. // If there is an error, this function will fill in a dummy type as fallback. 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() == DeclaratorContext::AliasDeclContext || D.getContext() == DeclaratorContext::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); // If T is 'decltype(auto)', the only declarators we can have are parens // and at most one function declarator if this is a function declaration. // If T is a deduced class template specialization type, we can have no // declarator chunks at all. if (auto *DT = T->getAs()) { const AutoType *AT = T->getAs(); bool IsClassTemplateDeduction = isa(DT); if ((AT && AT->isDecltypeAuto()) || IsClassTemplateDeduction) { for (unsigned I = 0, E = D.getNumTypeObjects(); I != E; ++I) { unsigned Index = E - I - 1; DeclaratorChunk &DeclChunk = D.getTypeObject(Index); unsigned DiagId = IsClassTemplateDeduction ? diag::err_deduced_class_template_compound_type : diag::err_decltype_auto_compound_type; unsigned DiagKind = 0; switch (DeclChunk.Kind) { case DeclaratorChunk::Paren: // FIXME: Rejecting this is a little silly. if (IsClassTemplateDeduction) { DiagKind = 4; break; } continue; case DeclaratorChunk::Function: { if (IsClassTemplateDeduction) { DiagKind = 3; break; } unsigned FnIndex; if (D.isFunctionDeclarationContext() && D.isFunctionDeclarator(FnIndex) && FnIndex == Index) continue; DiagId = diag::err_decltype_auto_function_declarator_not_declaration; break; } case DeclaratorChunk::Pointer: case DeclaratorChunk::BlockPointer: case DeclaratorChunk::MemberPointer: DiagKind = 0; break; case DeclaratorChunk::Reference: DiagKind = 1; break; case DeclaratorChunk::Array: DiagKind = 2; break; case DeclaratorChunk::Pipe: break; } S.Diag(DeclChunk.Loc, DiagId) << DiagKind; D.setInvalidType(true); break; } } } // Determine whether we should infer _Nonnull on pointer types. Optional inferNullability; bool inferNullabilityCS = false; bool inferNullabilityInnerOnly = false; bool inferNullabilityInnerOnlyComplete = false; // Are we in an assume-nonnull region? bool inAssumeNonNullRegion = false; SourceLocation assumeNonNullLoc = S.PP.getPragmaAssumeNonNullLoc(); if (assumeNonNullLoc.isValid()) { inAssumeNonNullRegion = true; recordNullabilitySeen(S, assumeNonNullLoc); } // Whether to complain about missing nullability specifiers or not. enum { /// Never complain. CAMN_No, /// Complain on the inner pointers (but not the outermost /// pointer). CAMN_InnerPointers, /// Complain about any pointers that don't have nullability /// specified or inferred. CAMN_Yes } complainAboutMissingNullability = CAMN_No; unsigned NumPointersRemaining = 0; auto complainAboutInferringWithinChunk = PointerWrappingDeclaratorKind::None; if (IsTypedefName) { // For typedefs, we do not infer any nullability (the default), // and we only complain about missing nullability specifiers on // inner pointers. complainAboutMissingNullability = CAMN_InnerPointers; if (T->canHaveNullability(/*ResultIfUnknown*/false) && !T->getNullability(S.Context)) { // Note that we allow but don't require nullability on dependent types. ++NumPointersRemaining; } for (unsigned i = 0, n = D.getNumTypeObjects(); i != n; ++i) { DeclaratorChunk &chunk = D.getTypeObject(i); switch (chunk.Kind) { case DeclaratorChunk::Array: case DeclaratorChunk::Function: case DeclaratorChunk::Pipe: break; case DeclaratorChunk::BlockPointer: case DeclaratorChunk::MemberPointer: ++NumPointersRemaining; break; case DeclaratorChunk::Paren: case DeclaratorChunk::Reference: continue; case DeclaratorChunk::Pointer: ++NumPointersRemaining; continue; } } } else { bool isFunctionOrMethod = false; switch (auto context = state.getDeclarator().getContext()) { case DeclaratorContext::ObjCParameterContext: case DeclaratorContext::ObjCResultContext: case DeclaratorContext::PrototypeContext: case DeclaratorContext::TrailingReturnContext: isFunctionOrMethod = true; LLVM_FALLTHROUGH; case DeclaratorContext::MemberContext: if (state.getDeclarator().isObjCIvar() && !isFunctionOrMethod) { complainAboutMissingNullability = CAMN_No; break; } // Weak properties are inferred to be nullable. if (state.getDeclarator().isObjCWeakProperty() && inAssumeNonNullRegion) { inferNullability = NullabilityKind::Nullable; break; } LLVM_FALLTHROUGH; case DeclaratorContext::FileContext: case DeclaratorContext::KNRTypeListContext: { complainAboutMissingNullability = CAMN_Yes; // Nullability inference depends on the type and declarator. auto wrappingKind = PointerWrappingDeclaratorKind::None; switch (classifyPointerDeclarator(S, T, D, wrappingKind)) { case PointerDeclaratorKind::NonPointer: case PointerDeclaratorKind::MultiLevelPointer: // Cannot infer nullability. break; case PointerDeclaratorKind::SingleLevelPointer: // Infer _Nonnull if we are in an assumes-nonnull region. if (inAssumeNonNullRegion) { complainAboutInferringWithinChunk = wrappingKind; inferNullability = NullabilityKind::NonNull; inferNullabilityCS = (context == DeclaratorContext::ObjCParameterContext || context == DeclaratorContext::ObjCResultContext); } break; case PointerDeclaratorKind::CFErrorRefPointer: case PointerDeclaratorKind::NSErrorPointerPointer: // Within a function or method signature, infer _Nullable at both // levels. if (isFunctionOrMethod && inAssumeNonNullRegion) inferNullability = NullabilityKind::Nullable; break; case PointerDeclaratorKind::MaybePointerToCFRef: if (isFunctionOrMethod) { // On pointer-to-pointer parameters marked cf_returns_retained or // cf_returns_not_retained, if the outer pointer is explicit then // infer the inner pointer as _Nullable. auto hasCFReturnsAttr = [](const AttributeList *NextAttr) -> bool { while (NextAttr) { if (NextAttr->getKind() == AttributeList::AT_CFReturnsRetained || NextAttr->getKind() == AttributeList::AT_CFReturnsNotRetained) return true; NextAttr = NextAttr->getNext(); } return false; }; if (const auto *InnermostChunk = D.getInnermostNonParenChunk()) { if (hasCFReturnsAttr(D.getAttributes()) || hasCFReturnsAttr(InnermostChunk->getAttrs()) || hasCFReturnsAttr(D.getDeclSpec().getAttributes().getList())) { inferNullability = NullabilityKind::Nullable; inferNullabilityInnerOnly = true; } } } break; } break; } case DeclaratorContext::ConversionIdContext: complainAboutMissingNullability = CAMN_Yes; break; case DeclaratorContext::AliasDeclContext: case DeclaratorContext::AliasTemplateContext: case DeclaratorContext::BlockContext: case DeclaratorContext::BlockLiteralContext: case DeclaratorContext::ConditionContext: case DeclaratorContext::CXXCatchContext: case DeclaratorContext::CXXNewContext: case DeclaratorContext::ForContext: case DeclaratorContext::InitStmtContext: case DeclaratorContext::LambdaExprContext: case DeclaratorContext::LambdaExprParameterContext: case DeclaratorContext::ObjCCatchContext: case DeclaratorContext::TemplateParamContext: case DeclaratorContext::TemplateTypeArgContext: case DeclaratorContext::TypeNameContext: case DeclaratorContext::FunctionalCastContext: // Don't infer in these contexts. break; } } // Local function that returns true if its argument looks like a va_list. auto isVaList = [&S](QualType T) -> bool { auto *typedefTy = T->getAs(); if (!typedefTy) return false; TypedefDecl *vaListTypedef = S.Context.getBuiltinVaListDecl(); do { if (typedefTy->getDecl() == vaListTypedef) return true; if (auto *name = typedefTy->getDecl()->getIdentifier()) if (name->isStr("va_list")) return true; typedefTy = typedefTy->desugar()->getAs(); } while (typedefTy); return false; }; // Local function that checks the nullability for a given pointer declarator. // Returns true if _Nonnull was inferred. auto inferPointerNullability = [&](SimplePointerKind pointerKind, SourceLocation pointerLoc, SourceLocation pointerEndLoc, AttributeList *&attrs) -> AttributeList * { // We've seen a pointer. if (NumPointersRemaining > 0) --NumPointersRemaining; // If a nullability attribute is present, there's nothing to do. if (hasNullabilityAttr(attrs)) return nullptr; // If we're supposed to infer nullability, do so now. if (inferNullability && !inferNullabilityInnerOnlyComplete) { AttributeList::Syntax syntax = inferNullabilityCS ? AttributeList::AS_ContextSensitiveKeyword : AttributeList::AS_Keyword; AttributeList *nullabilityAttr = state.getDeclarator().getAttributePool() .create( S.getNullabilityKeyword( *inferNullability), SourceRange(pointerLoc), nullptr, SourceLocation(), nullptr, 0, syntax); spliceAttrIntoList(*nullabilityAttr, attrs); if (inferNullabilityCS) { state.getDeclarator().getMutableDeclSpec().getObjCQualifiers() ->setObjCDeclQualifier(ObjCDeclSpec::DQ_CSNullability); } if (pointerLoc.isValid() && complainAboutInferringWithinChunk != PointerWrappingDeclaratorKind::None) { auto Diag = S.Diag(pointerLoc, diag::warn_nullability_inferred_on_nested_type); Diag << static_cast(complainAboutInferringWithinChunk); fixItNullability(S, Diag, pointerLoc, NullabilityKind::NonNull); } if (inferNullabilityInnerOnly) inferNullabilityInnerOnlyComplete = true; return nullabilityAttr; } // If we're supposed to complain about missing nullability, do so // now if it's truly missing. switch (complainAboutMissingNullability) { case CAMN_No: break; case CAMN_InnerPointers: if (NumPointersRemaining == 0) break; LLVM_FALLTHROUGH; case CAMN_Yes: checkNullabilityConsistency(S, pointerKind, pointerLoc, pointerEndLoc); } return nullptr; }; // If the type itself could have nullability but does not, infer pointer // nullability and perform consistency checking. if (S.CodeSynthesisContexts.empty()) { if (T->canHaveNullability(/*ResultIfUnknown*/false) && !T->getNullability(S.Context)) { if (isVaList(T)) { // Record that we've seen a pointer, but do nothing else. if (NumPointersRemaining > 0) --NumPointersRemaining; } else { SimplePointerKind pointerKind = SimplePointerKind::Pointer; if (T->isBlockPointerType()) pointerKind = SimplePointerKind::BlockPointer; else if (T->isMemberPointerType()) pointerKind = SimplePointerKind::MemberPointer; if (auto *attr = inferPointerNullability( pointerKind, D.getDeclSpec().getTypeSpecTypeLoc(), D.getDeclSpec().getLocEnd(), D.getMutableDeclSpec().getAttributes().getListRef())) { T = Context.getAttributedType( AttributedType::getNullabilityAttrKind(*inferNullability),T,T); attr->setUsedAsTypeAttr(); } } } if (complainAboutMissingNullability == CAMN_Yes && T->isArrayType() && !T->getNullability(S.Context) && !isVaList(T) && D.isPrototypeContext() && !hasOuterPointerLikeChunk(D, D.getNumTypeObjects())) { checkNullabilityConsistency(S, SimplePointerKind::Array, D.getDeclSpec().getTypeSpecTypeLoc()); } } // 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); IsQualifiedFunction &= DeclType.Kind == DeclaratorChunk::Paren; switch (DeclType.Kind) { case DeclaratorChunk::Paren: if (i == 0) warnAboutRedundantParens(S, D, T); 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) << LangOpts.OpenCL; // Handle pointer nullability. inferPointerNullability(SimplePointerKind::BlockPointer, DeclType.Loc, DeclType.EndLoc, DeclType.getAttrListRef()); T = S.BuildBlockPointerType(T, D.getIdentifierLoc(), Name); if (DeclType.Cls.TypeQuals || LangOpts.OpenCL) { // OpenCL v2.0, s6.12.5 - Block variable declarations are implicitly // qualified with const. if (LangOpts.OpenCL) DeclType.Cls.TypeQuals |= DeclSpec::TQ_const; 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. } // Handle pointer nullability inferPointerNullability(SimplePointerKind::Pointer, DeclType.Loc, DeclType.EndLoc, DeclType.getAttrListRef()); if (LangOpts.ObjC1 && T->getAs()) { T = Context.getObjCObjectPointerType(T); if (DeclType.Ptr.TypeQuals) T = S.BuildQualifiedType(T, DeclType.Loc, DeclType.Ptr.TypeQuals); break; } // OpenCL v2.0 s6.9b - Pointer to image/sampler cannot be used. // OpenCL v2.0 s6.13.16.1 - Pointer to pipe cannot be used. // OpenCL v2.0 s6.12.5 - Pointers to Blocks are not allowed. if (LangOpts.OpenCL) { if (T->isImageType() || T->isSamplerT() || T->isPipeType() || T->isBlockPointerType()) { S.Diag(D.getIdentifierLoc(), diag::err_opencl_pointer_to_type) << T; D.setInvalidType(true); } } 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); 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() == DeclaratorContext::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. if (hasOuterPointerLikeChunk(D, chunkIndex)) { 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); } } const AutoType *AT = T->getContainedAutoType(); // Allow arrays of auto if we are a generic lambda parameter. // i.e. [](auto (&array)[5]) { return array[0]; }; OK if (AT && D.getContext() != DeclaratorContext::LambdaExprParameterContext) { // We've already diagnosed this for decltype(auto). if (!AT->isDecltypeAuto()) S.Diag(DeclType.Loc, diag::err_illegal_decl_array_of_auto) << getPrintableNameForEntity(Name) << T; T = QualType(); break; } // Array parameters can be marked nullable as well, although it's not // necessary if they're marked 'static'. if (complainAboutMissingNullability == CAMN_Yes && !hasNullabilityAttr(DeclType.getAttrs()) && ASM != ArrayType::Static && D.isPrototypeContext() && !hasOuterPointerLikeChunk(D, chunkIndex)) { checkNullabilityConsistency(S, SimplePointerKind::Array, DeclType.Loc); } 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().hasAutoTypeSpec() && !FTI.hasTrailingReturnType() && chunkIndex == 0 && !S.getLangOpts().CPlusPlus14) { S.Diag(D.getDeclSpec().getTypeSpecTypeLoc(), D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_auto ? diag::err_auto_missing_trailing_return : diag::err_deduced_return_type); 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.getLocStart(), diag::err_trailing_return_in_parens) << T << D.getSourceRange(); D.setInvalidType(true); } else if (D.getName().getKind() == UnqualifiedIdKind::IK_DeductionGuideName) { if (T != Context.DependentTy) { S.Diag(D.getDeclSpec().getLocStart(), diag::err_deduction_guide_with_complex_decl) << D.getSourceRange(); D.setInvalidType(true); } } else if (D.getContext() != DeclaratorContext::LambdaExprContext && (T.hasQualifiers() || !isa(T) || cast(T)->getKeyword() != AutoTypeKeyword::Auto)) { 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 (!D.isInvalidType() && (T->isArrayType() || T->isFunctionType()) && (D.getName().getKind() != UnqualifiedIdKind::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() == DeclaratorContext::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().isEnabled("cl_khr_fp16")) { S.Diag(D.getIdentifierLoc(), diag::err_opencl_invalid_return) << T << 0 /*pointer hint*/; D.setInvalidType(true); } } else if (!S.getLangOpts().HalfArgsAndReturns) { S.Diag(D.getIdentifierLoc(), diag::err_parameters_retval_cannot_have_fp16_type) << 1; D.setInvalidType(true); } } if (LangOpts.OpenCL) { // OpenCL v2.0 s6.12.5 - A block cannot be the return value of a // function. if (T->isBlockPointerType() || T->isImageType() || T->isSamplerT() || T->isPipeType()) { S.Diag(D.getIdentifierLoc(), diag::err_opencl_invalid_return) << T << 1 /*hint off*/; D.setInvalidType(true); } // OpenCL doesn't support variadic functions and blocks // (s6.9.e and s6.12.5 OpenCL v2.0) except for printf. // We also allow here any toolchain reserved identifiers. if (FTI.isVariadic && !(D.getIdentifier() && ((D.getIdentifier()->getName() == "printf" && LangOpts.OpenCLVersion >= 120) || D.getIdentifier()->getName().startswith("__")))) { S.Diag(D.getIdentifierLoc(), diag::err_opencl_variadic_function); D.setInvalidType(true); } } // Methods cannot return interface types. All ObjC objects are // passed by reference. if (T->isObjCObjectType()) { SourceLocation DiagLoc, FixitLoc; if (TInfo) { DiagLoc = TInfo->getTypeLoc().getLocStart(); FixitLoc = S.getLocForEndOfToken(TInfo->getTypeLoc().getLocEnd()); } else { DiagLoc = D.getDeclSpec().getTypeSpecTypeLoc(); FixitLoc = S.getLocForEndOfToken(D.getDeclSpec().getLocEnd()); } S.Diag(DiagLoc, diag::err_object_cannot_be_passed_returned_by_value) << 0 << T << FixItHint::CreateInsertion(FixitLoc, "*"); T = Context.getObjCObjectPointerType(T); if (TInfo) { TypeLocBuilder TLB; TLB.pushFullCopy(TInfo->getTypeLoc()); ObjCObjectPointerTypeLoc TLoc = TLB.push(T); TLoc.setStarLoc(FixitLoc); TInfo = TLB.getTypeSourceInfo(Context, T); } 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()))) { if (T->isVoidType() && !S.getLangOpts().CPlusPlus && D.getFunctionDefinitionKind() == FDK_Definition) { // [6.9.1/3] qualified void return is invalid on a C // function definition. Apparently ok on declarations and // in C++ though (!) S.Diag(DeclType.Loc, diag::err_func_returning_qualified_void) << T; } else diagnoseRedundantReturnTypeQualifiers(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().hasTagDefinition()) { // C++ [dcl.fct]p6: // Types shall not be defined in return or parameter types. TagDecl *Tag = cast(D.getDeclSpec().getRepAsDecl()); 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() && !LangOpts.CPlusPlus17) S.Diag(FTI.getExceptionSpecLocBeg(), diag::err_exception_spec_in_typedef) << (D.getContext() == DeclaratorContext::AliasDeclContext || D.getContext() == DeclaratorContext::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); FunctionType::ExtInfo EI(getCCForDeclaratorChunk(S, D, FTI, chunkIndex)); if (!FTI.NumParams && !FTI.isVariadic && !LangOpts.CPlusPlus && !LangOpts.OpenCL) { // Simple void foo(), where the incoming T is the result type. T = Context.getFunctionNoProtoType(T, EI); } 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.NumParams && 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_param); } if (FTI.NumParams && FTI.Params[0].Param == nullptr) { // C99 6.7.5.3p3: Reject int(x,y,z) when it's not a function // definition. S.Diag(FTI.Params[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, EI); break; } FunctionProtoType::ExtProtoInfo EPI; EPI.ExtInfo = EI; 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 a parameter list that is // potentially variadic. SmallVector ParamTys; ParamTys.reserve(FTI.NumParams); SmallVector ExtParameterInfos(FTI.NumParams); bool HasAnyInterestingExtParameterInfos = false; for (unsigned i = 0, e = FTI.NumParams; i != e; ++i) { ParmVarDecl *Param = cast(FTI.Params[i].Param); QualType ParamTy = Param->getType(); assert(!ParamTy.isNull() && "Couldn't parse type?"); // Look for 'void'. void is allowed only as a single parameter to a // function with no other parameters (C99 6.7.5.3p10). We record // int(void) as a FunctionProtoType with an empty parameter list. if (ParamTy->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 parameters of incomplete type. if (FTI.NumParams != 1 || FTI.isVariadic) { S.Diag(DeclType.Loc, diag::err_void_only_param); ParamTy = Context.IntTy; Param->setType(ParamTy); } else if (FTI.Params[i].Ident) { // Reject, but continue to parse 'int(void abc)'. S.Diag(FTI.Params[i].IdentLoc, diag::err_param_with_void_type); ParamTy = Context.IntTy; Param->setType(ParamTy); } else { // Reject, but continue to parse 'float(const void)'. if (ParamTy.hasQualifiers()) S.Diag(DeclType.Loc, diag::err_void_param_qualified); // Do not add 'void' to the list. break; } } else if (ParamTy->isHalfType()) { // Disallow half FP parameters. // FIXME: This really should be in BuildFunctionType. if (S.getLangOpts().OpenCL) { if (!S.getOpenCLOptions().isEnabled("cl_khr_fp16")) { S.Diag(Param->getLocation(), diag::err_opencl_half_param) << ParamTy; D.setInvalidType(); Param->setInvalidDecl(); } } else if (!S.getLangOpts().HalfArgsAndReturns) { S.Diag(Param->getLocation(), diag::err_parameters_retval_cannot_have_fp16_type) << 0; D.setInvalidType(); } } else if (!FTI.hasPrototype) { if (ParamTy->isPromotableIntegerType()) { ParamTy = Context.getPromotedIntegerType(ParamTy); Param->setKNRPromoted(true); } else if (const BuiltinType* BTy = ParamTy->getAs()) { if (BTy->getKind() == BuiltinType::Float) { ParamTy = Context.DoubleTy; Param->setKNRPromoted(true); } } } if (LangOpts.ObjCAutoRefCount && Param->hasAttr()) { ExtParameterInfos[i] = ExtParameterInfos[i].withIsConsumed(true); HasAnyInterestingExtParameterInfos = true; } if (auto attr = Param->getAttr()) { ExtParameterInfos[i] = ExtParameterInfos[i].withABI(attr->getABI()); HasAnyInterestingExtParameterInfos = true; } if (Param->hasAttr()) { ExtParameterInfos[i] = ExtParameterInfos[i].withHasPassObjectSize(); HasAnyInterestingExtParameterInfos = true; } if (Param->hasAttr()) { ExtParameterInfos[i] = ExtParameterInfos[i].withIsNoEscape(true); HasAnyInterestingExtParameterInfos = true; } ParamTys.push_back(ParamTy); } if (HasAnyInterestingExtParameterInfos) { EPI.ExtParameterInfos = ExtParameterInfos.data(); checkExtParameterInfos(S, ParamTys, EPI, [&](unsigned i) { return FTI.Params[i].Param->getLocation(); }); } SmallVector Exceptions; SmallVector DynamicExceptions; SmallVector DynamicExceptionRanges; Expr *NoexceptExpr = nullptr; if (FTI.getExceptionSpecType() == EST_Dynamic) { // FIXME: It's rather inefficient to have to split into two vectors // here. unsigned N = FTI.getNumExceptions(); 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(D.isFunctionDeclarationContext(), FTI.getExceptionSpecType(), DynamicExceptions, DynamicExceptionRanges, NoexceptExpr, Exceptions, EPI.ExceptionSpec); T = Context.getFunctionType(T, ParamTys, EPI); } break; } case DeclaratorChunk::MemberPointer: { // The scope spec must refer to a class, or be dependent. CXXScopeSpec &SS = DeclType.Mem.Scope(); QualType ClsType; // Handle pointer nullability. inferPointerNullability(SimplePointerKind::MemberPointer, DeclType.Loc, DeclType.EndLoc, DeclType.getAttrListRef()); 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 = 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: case NestedNameSpecifier::Super: 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; } case DeclaratorChunk::Pipe: { T = S.BuildReadPipeType(T, DeclType.Loc); processTypeAttrs(state, T, TAL_DeclSpec, D.getDeclSpec().getAttributes().getList()); break; } } if (T.isNull()) { D.setInvalidType(true); T = Context.IntTy; } // See if there are any attributes on this declarator chunk. processTypeAttrs(state, T, TAL_DeclChunk, const_cast(DeclType.getAttrs())); } // GNU warning -Wstrict-prototypes // Warn if a function declaration is without a prototype. // This warning is issued for all kinds of unprototyped function // declarations (i.e. function type typedef, function pointer etc.) // C99 6.7.5.3p14: // The empty list in a function declarator that is not part of a definition // of that function specifies that no information about the number or types // of the parameters is supplied. if (!LangOpts.CPlusPlus && D.getFunctionDefinitionKind() == FDK_Declaration) { bool IsBlock = false; for (const DeclaratorChunk &DeclType : D.type_objects()) { switch (DeclType.Kind) { case DeclaratorChunk::BlockPointer: IsBlock = true; break; case DeclaratorChunk::Function: { const DeclaratorChunk::FunctionTypeInfo &FTI = DeclType.Fun; if (FTI.NumParams == 0 && !FTI.isVariadic) S.Diag(DeclType.Loc, diag::warn_strict_prototypes) << IsBlock << FixItHint::CreateInsertion(FTI.getRParenLoc(), "void"); IsBlock = false; break; } default: break; } } } assert(!T.isNull() && "T must not be null after this point"); 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. enum { NonMember, Member, DeductionGuide } Kind = NonMember; if (D.getName().getKind() == UnqualifiedIdKind::IK_DeductionGuideName) Kind = DeductionGuide; else if (!D.getCXXScopeSpec().isSet()) { if ((D.getContext() == DeclaratorContext::MemberContext || D.getContext() == DeclaratorContext::LambdaExprContext) && !D.getDeclSpec().isFriendSpecified()) Kind = Member; } else { DeclContext *DC = S.computeDeclContext(D.getCXXScopeSpec()); if (!DC || DC->isRecord()) Kind = Member; } // 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 // // FIXME: Checking this here is insufficient. We accept-invalid on: // // template struct S { void f(T); }; // S s; // // ... for instance. if (IsQualifiedFunction && !(Kind == Member && D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) && !IsTypedefName && D.getContext() != DeclaratorContext::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()); 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) << Kind << 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->getReturnType(), FnTy->getParamTypes(), 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. processTypeAttrs(state, T, TAL_DeclName, D.getAttributes()); // Diagnose any ignored type attributes. 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()) { // 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 DeclaratorContext::PrototypeContext: case DeclaratorContext::LambdaExprParameterContext: // 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 DeclaratorContext::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 DeclaratorContext::FileContext: case DeclaratorContext::KNRTypeListContext: case DeclaratorContext::ObjCParameterContext: // FIXME: special diagnostic // here? case DeclaratorContext::ObjCResultContext: // FIXME: special diagnostic // here? case DeclaratorContext::TypeNameContext: case DeclaratorContext::FunctionalCastContext: case DeclaratorContext::CXXNewContext: case DeclaratorContext::AliasDeclContext: case DeclaratorContext::AliasTemplateContext: case DeclaratorContext::MemberContext: case DeclaratorContext::BlockContext: case DeclaratorContext::ForContext: case DeclaratorContext::InitStmtContext: case DeclaratorContext::ConditionContext: case DeclaratorContext::CXXCatchContext: case DeclaratorContext::ObjCCatchContext: case DeclaratorContext::BlockLiteralContext: case DeclaratorContext::LambdaExprContext: case DeclaratorContext::ConversionIdContext: case DeclaratorContext::TrailingReturnContext: case DeclaratorContext::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; } } assert(!T.isNull() && "T must not be null at the end of this function"); 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 = nullptr; QualType T = GetDeclSpecTypeForDeclarator(state, ReturnTypeInfo); 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 = nullptr; 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; } IdentifierLoc *Arg = new (S.Context) IdentifierLoc; Arg->Ident = &S.Context.Idents.get(attrStr); Arg->Loc = SourceLocation(); ArgsUnion Args(Arg); // 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*/ nullptr, SourceLocation(), /*args*/ &Args, 1, 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: case DeclaratorChunk::Pipe: 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 = nullptr; QualType declSpecTy = GetDeclSpecTypeForDeclarator(state, ReturnTypeInfo); if (getLangOpts().ObjC1) { 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: case AttributedType::attr_objc_inert_unsafe_unretained: 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_regcall: return AttributeList::AT_RegCall; case AttributedType::attr_pascal: return AttributeList::AT_Pascal; case AttributedType::attr_swiftcall: return AttributeList::AT_SwiftCall; case AttributedType::attr_vectorcall: return AttributeList::AT_VectorCall; case AttributedType::attr_pcs: case AttributedType::attr_pcs_vfp: return AttributeList::AT_Pcs; case AttributedType::attr_inteloclbicc: return AttributeList::AT_IntelOclBicc; case AttributedType::attr_ms_abi: return AttributeList::AT_MSABI; case AttributedType::attr_sysv_abi: return AttributeList::AT_SysVABI; case AttributedType::attr_preserve_most: return AttributeList::AT_PreserveMost; case AttributedType::attr_preserve_all: return AttributeList::AT_PreserveAll; case AttributedType::attr_ptr32: return AttributeList::AT_Ptr32; case AttributedType::attr_ptr64: return AttributeList::AT_Ptr64; case AttributedType::attr_sptr: return AttributeList::AT_SPtr; case AttributedType::attr_uptr: return AttributeList::AT_UPtr; case AttributedType::attr_nonnull: return AttributeList::AT_TypeNonNull; case AttributedType::attr_nullable: return AttributeList::AT_TypeNullable; case AttributedType::attr_null_unspecified: return AttributeList::AT_TypeNullUnspecified; case AttributedType::attr_objc_kindof: return AttributeList::AT_ObjCKindOf; case AttributedType::attr_ns_returns_retained: return AttributeList::AT_NSReturnsRetained; } llvm_unreachable("unexpected attribute kind!"); } static void fillAttributedTypeLoc(AttributedTypeLoc TL, const AttributeList *attrs, const AttributeList *DeclAttrs = nullptr) { // DeclAttrs and attrs cannot be both empty. assert((attrs || DeclAttrs) && "no type attributes in the expected location!"); AttributeList::Kind parsedKind = getAttrListKind(TL.getAttrKind()); // Try to search for an attribute of matching kind in attrs list. while (attrs && attrs->getKind() != parsedKind) attrs = attrs->getNext(); if (!attrs) { // No matching type attribute in attrs list found. // Try searching through C++11 attributes in the declarator attribute list. while (DeclAttrs && (!DeclAttrs->isCXX11Attribute() || DeclAttrs->getKind() != parsedKind)) DeclAttrs = DeclAttrs->getNext(); attrs = DeclAttrs; } assert(attrs && "no matching type attribute in expected location!"); TL.setAttrNameLoc(attrs->getLoc()); if (TL.hasAttrExprOperand()) { assert(attrs->isArgExpr(0) && "mismatched attribute operand kind"); TL.setAttrExprOperand(attrs->getArgAsExpr(0)); } else if (TL.hasAttrEnumOperand()) { assert((attrs->isArgIdent(0) || attrs->isArgExpr(0)) && "unexpected attribute operand kind"); if (attrs->isArgIdent(0)) TL.setAttrEnumOperandLoc(attrs->getArgAsIdent(0)->Loc); else TL.setAttrEnumOperandLoc(attrs->getArgAsExpr(0)->getExprLoc()); } // 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) { TypeSourceInfo *RepTInfo = nullptr; Sema::GetTypeFromParser(DS.getRepAsType(), &RepTInfo); TL.copy(RepTInfo->getTypeLoc()); } void VisitObjCObjectPointerTypeLoc(ObjCObjectPointerTypeLoc TL) { TypeSourceInfo *RepTInfo = nullptr; Sema::GetTypeFromParser(DS.getRepAsType(), &RepTInfo); TL.copy(RepTInfo->getTypeLoc()); } void VisitTemplateSpecializationTypeLoc(TemplateSpecializationTypeLoc TL) { TypeSourceInfo *TInfo = nullptr; 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()); assert(TL.getRAngleLoc() == OldTL.castAs().getRAngleLoc()); } } 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 = nullptr; 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 = nullptr; 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) TL.expandBuiltinRange(DS.getTypeSpecSignLoc()); if (TL.getWrittenWidthSpec() != TSW_unspecified) TL.expandBuiltinRange(DS.getTypeSpecWidthRange()); } } void VisitElaboratedTypeLoc(ElaboratedTypeLoc TL) { ElaboratedTypeKeyword Keyword = TypeWithKeyword::getKeywordForTypeSpec(DS.getTypeSpecType()); if (DS.getTypeSpecType() == TST_typename) { TypeSourceInfo *TInfo = nullptr; 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 = nullptr; Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); assert(TInfo); TL.copy(TInfo->getTypeLoc().castAs()); } void VisitDependentTemplateSpecializationTypeLoc( DependentTemplateSpecializationTypeLoc TL) { assert(DS.getTypeSpecType() == TST_typename); TypeSourceInfo *TInfo = nullptr; 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 = nullptr; 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 VisitPipeTypeLoc(PipeTypeLoc TL) { TL.setKWLoc(DS.getTypeSpecTypeLoc()); TypeSourceInfo *TInfo = nullptr; Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); TL.getValueLoc().initializeFullCopy(TInfo->getTypeLoc()); } 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 VisitDecayedTypeLoc(DecayedTypeLoc TL) { llvm_unreachable("decayed type locs not expected here!"); } void VisitAttributedTypeLoc(AttributedTypeLoc TL) { fillAttributedTypeLoc(TL, Chunk.getAttrs()); } void VisitAdjustedTypeLoc(AdjustedTypeLoc TL) { // nothing } 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: case NestedNameSpecifier::Super: 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.getNumParams(), tpi = 0; i != e; ++i) { ParmVarDecl *Param = cast(FTI.Params[i].Param); TL.setParam(tpi++, Param); } TL.setExceptionSpecRange(FTI.getExceptionSpecRange()); } void VisitParenTypeLoc(ParenTypeLoc TL) { assert(Chunk.Kind == DeclaratorChunk::Paren); TL.setLParenLoc(Chunk.Loc); TL.setRParenLoc(Chunk.EndLoc); } void VisitPipeTypeLoc(PipeTypeLoc TL) { assert(Chunk.Kind == DeclaratorChunk::Pipe); TL.setKWLoc(Chunk.Loc); } void VisitTypeLoc(TypeLoc TL) { llvm_unreachable("unsupported TypeLoc kind in declarator!"); } }; } // end anonymous namespace static void fillAtomicQualLoc(AtomicTypeLoc ATL, const DeclaratorChunk &Chunk) { SourceLocation Loc; switch (Chunk.Kind) { case DeclaratorChunk::Function: case DeclaratorChunk::Array: case DeclaratorChunk::Paren: case DeclaratorChunk::Pipe: 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()); } static void fillDependentAddressSpaceTypeLoc(DependentAddressSpaceTypeLoc DASTL, const AttributeList *Attrs) { while (Attrs && Attrs->getKind() != AttributeList::AT_AddressSpace) Attrs = Attrs->getNext(); assert(Attrs && "no address_space attribute found at the expected location!"); DASTL.setAttrNameLoc(Attrs->getLoc()); DASTL.setAttrExprOperand(Attrs->getArgAsExpr(0)); DASTL.setAttrOperandParensRange(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(); const AttributeList *DeclAttrs = D.getAttributes(); // 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) { if (DependentAddressSpaceTypeLoc DASTL = CurrTL.getAs()) { fillDependentAddressSpaceTypeLoc(DASTL, D.getTypeObject(i).getAttrs()); CurrTL = DASTL.getPointeeTypeLoc().getUnqualifiedLoc(); } // 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(), DeclAttrs); CurrTL = TL.getNextTypeLoc().getUnqualifiedLoc(); } // FIXME: Ordering here? while (AdjustedTypeLoc TL = CurrTL.getAs()) 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() == nullptr && "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() != DeclaratorContext::ObjCParameterContext && D.getContext() != DeclaratorContext::AliasDeclContext && D.getContext() != DeclaratorContext::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 //===----------------------------------------------------------------------===// /// BuildAddressSpaceAttr - Builds a DependentAddressSpaceType if an expression /// is uninstantiated. If instantiated it will apply the appropriate address space /// to the type. This function allows dependent template variables to be used in /// conjunction with the address_space attribute QualType Sema::BuildAddressSpaceAttr(QualType &T, Expr *AddrSpace, SourceLocation AttrLoc) { if (!AddrSpace->isValueDependent()) { // 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 (T.getAddressSpace() != LangAS::Default) { Diag(AttrLoc, diag::err_attribute_address_multiple_qualifiers); return QualType(); } llvm::APSInt addrSpace(32); if (!AddrSpace->isIntegerConstantExpr(addrSpace, Context)) { Diag(AttrLoc, diag::err_attribute_argument_type) << "'address_space'" << AANT_ArgumentIntegerConstant << AddrSpace->getSourceRange(); return QualType(); } // Bounds checking. if (addrSpace.isSigned()) { if (addrSpace.isNegative()) { Diag(AttrLoc, diag::err_attribute_address_space_negative) << AddrSpace->getSourceRange(); return QualType(); } addrSpace.setIsSigned(false); } llvm::APSInt max(addrSpace.getBitWidth()); max = Qualifiers::MaxAddressSpace - (unsigned)LangAS::FirstTargetAddressSpace; if (addrSpace > max) { Diag(AttrLoc, diag::err_attribute_address_space_too_high) << (unsigned)max.getZExtValue() << AddrSpace->getSourceRange(); return QualType(); } LangAS ASIdx = getLangASFromTargetAS(static_cast(addrSpace.getZExtValue())); return Context.getAddrSpaceQualType(T, ASIdx); } // A check with similar intentions as checking if a type already has an // address space except for on a dependent types, basically if the // current type is already a DependentAddressSpaceType then its already // lined up to have another address space on it and we can't have // multiple address spaces on the one pointer indirection if (T->getAs()) { Diag(AttrLoc, diag::err_attribute_address_multiple_qualifiers); return QualType(); } return Context.getDependentAddressSpaceType(T, AddrSpace, AttrLoc); } /// 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() != LangAS::Default) { 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; } LangAS ASIdx; if (Attr.getKind() == AttributeList::AT_AddressSpace) { // Check the attribute arguments. if (Attr.getNumArgs() != 1) { S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << Attr.getName() << 1; Attr.setInvalid(); return; } Expr *ASArgExpr; if (Attr.isArgIdent(0)) { // Special case where the argument is a template id. CXXScopeSpec SS; SourceLocation TemplateKWLoc; UnqualifiedId id; id.setIdentifier(Attr.getArgAsIdent(0)->Ident, Attr.getLoc()); ExprResult AddrSpace = S.ActOnIdExpression( S.getCurScope(), SS, TemplateKWLoc, id, false, false); if (AddrSpace.isInvalid()) return; ASArgExpr = static_cast(AddrSpace.get()); } else { ASArgExpr = static_cast(Attr.getArgAsExpr(0)); } // Create the DependentAddressSpaceType or append an address space onto // the type. QualType T = S.BuildAddressSpaceAttr(Type, ASArgExpr, Attr.getLoc()); if (!T.isNull()) Type = T; else Attr.setInvalid(); } else { // The keyword-based type attributes imply which address space to use. switch (Attr.getKind()) { case AttributeList::AT_OpenCLGlobalAddressSpace: ASIdx = LangAS::opencl_global; break; case AttributeList::AT_OpenCLLocalAddressSpace: ASIdx = LangAS::opencl_local; break; case AttributeList::AT_OpenCLConstantAddressSpace: ASIdx = LangAS::opencl_constant; break; case AttributeList::AT_OpenCLGenericAddressSpace: ASIdx = LangAS::opencl_generic; break; case AttributeList::AT_OpenCLPrivateAddressSpace: ASIdx = LangAS::opencl_private; break; default: llvm_unreachable("Invalid address space"); } 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() && !type->isUndeducedType()) { 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(), /*onlyBlockPointers=*/true)) return false; } } Sema &S = state.getSema(); SourceLocation AttrLoc = attr.getLoc(); if (AttrLoc.isMacroID()) AttrLoc = S.getSourceManager().getImmediateExpansionRange(AttrLoc).first; if (!attr.isArgIdent(0)) { S.Diag(AttrLoc, diag::err_attribute_argument_type) << attr.getName() << AANT_ArgumentString; attr.setInvalid(); return true; } IdentifierInfo *II = attr.getArgAsIdent(0)->Ident; Qualifiers::ObjCLifetime lifetime; if (II->isStr("none")) lifetime = Qualifiers::OCL_ExplicitNone; else if (II->isStr("strong")) lifetime = Qualifiers::OCL_Strong; else if (II->isStr("weak")) lifetime = Qualifiers::OCL_Weak; else if (II->isStr("autoreleasing")) lifetime = Qualifiers::OCL_Autoreleasing; else { S.Diag(AttrLoc, diag::warn_attribute_type_not_supported) << attr.getName() << II; attr.setInvalid(); return true; } // Just ignore lifetime attributes other than __weak and __unsafe_unretained // outside of ARC mode. if (!S.getLangOpts().ObjCAutoRefCount && lifetime != Qualifiers::OCL_Weak && lifetime != Qualifiers::OCL_ExplicitNone) { 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 // and remove the ObjCLifetime qualifiers. if (previousLifetime != lifetime) { // It's possible to have multiple local ObjCLifetime qualifiers. We // can't stop after we reach a type that is directly qualified. const Type *prevTy = nullptr; while (!prevTy || prevTy != underlyingType.Ty) { prevTy = underlyingType.Ty; 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_type_attribute_wrong_type) << name << TDS_ObjCObjOrBlock << type; } // Don't actually add the __unsafe_unretained qualifier in non-ARC files, // because having both 'T' and '__unsafe_unretained T' exist in the type // system causes unfortunate widespread consistency problems. (For example, // they're not considered compatible types, and we mangle them identicially // as template arguments.) These problems are all individually fixable, // but it's easier to just not add the qualifier and instead sniff it out // in specific places using isObjCInertUnsafeUnretainedType(). // // Doing this does means we miss some trivial consistency checks that // would've triggered in ARC, but that's better than trying to solve all // the coexistence problems with __unsafe_unretained. if (!S.getLangOpts().ObjCAutoRefCount && lifetime == Qualifiers::OCL_ExplicitNone) { type = S.Context.getAttributedType( AttributedType::attr_objc_inert_unsafe_unretained, type, type); return true; } 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); auto diagnoseOrDelay = [](Sema &S, SourceLocation loc, unsigned diagnostic, QualType type) { if (S.DelayedDiagnostics.shouldDelayDiagnostics()) { S.DelayedDiagnostics.add( sema::DelayedDiagnostic::makeForbiddenType( S.getSourceManager().getExpansionLoc(loc), diagnostic, type, /*ignored*/ 0)); } else { S.Diag(loc, diagnostic); } }; // Sometimes, __weak isn't allowed. if (lifetime == Qualifiers::OCL_Weak && !S.getLangOpts().ObjCWeak && !NonObjCPointer) { // Use a specialized diagnostic if the runtime just doesn't support them. unsigned diagnostic = (S.getLangOpts().ObjCWeakRuntime ? diag::err_arc_weak_disabled : diag::err_arc_weak_no_runtime); // In any case, delay the diagnostic until we know what we're parsing. diagnoseOrDelay(S, AttrLoc, diagnostic, type); 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.isArgIdent(0)) { S.Diag(attr.getLoc(), diag::err_attribute_argument_type) << attr.getName() << AANT_ArgumentString; attr.setInvalid(); return true; } Qualifiers::GC GCAttr; if (attr.getNumArgs() > 1) { S.Diag(attr.getLoc(), diag::err_attribute_wrong_number_arguments) << attr.getName() << 1; attr.setInvalid(); return true; } IdentifierInfo *II = attr.getArgAsIdent(0)->Ident; if (II->isStr("weak")) GCAttr = Qualifiers::Weak; else if (II->isStr("strong")) GCAttr = Qualifiers::Strong; else { S.Diag(attr.getLoc(), diag::warn_attribute_type_not_supported) << attr.getName() << II; 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, Attributed, 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 if (isa(Ty)) { T = cast(Ty)->getEquivalentType(); Stack.push_back(Attributed); } else { const Type *DTy = Ty->getUnqualifiedDesugaredType(); if (Ty == DTy) { Fn = nullptr; return; } T = QualType(DTy, 0); Stack.push_back(Desugar); } } } bool isFunctionType() const { return (Fn != nullptr); } 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 Attributed: return wrap(C, cast(Old)->getEquivalentType(), 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"); } }; } // end anonymous namespace static bool handleMSPointerTypeQualifierAttr(TypeProcessingState &State, AttributeList &Attr, QualType &Type) { Sema &S = State.getSema(); AttributeList::Kind Kind = Attr.getKind(); QualType Desugared = Type; const AttributedType *AT = dyn_cast(Type); while (AT) { AttributedType::Kind CurAttrKind = AT->getAttrKind(); // You cannot specify duplicate type attributes, so if the attribute has // already been applied, flag it. if (getAttrListKind(CurAttrKind) == Kind) { S.Diag(Attr.getLoc(), diag::warn_duplicate_attribute_exact) << Attr.getName(); return true; } // You cannot have both __sptr and __uptr on the same type, nor can you // have __ptr32 and __ptr64. if ((CurAttrKind == AttributedType::attr_ptr32 && Kind == AttributeList::AT_Ptr64) || (CurAttrKind == AttributedType::attr_ptr64 && Kind == AttributeList::AT_Ptr32)) { S.Diag(Attr.getLoc(), diag::err_attributes_are_not_compatible) << "'__ptr32'" << "'__ptr64'"; return true; } else if ((CurAttrKind == AttributedType::attr_sptr && Kind == AttributeList::AT_UPtr) || (CurAttrKind == AttributedType::attr_uptr && Kind == AttributeList::AT_SPtr)) { S.Diag(Attr.getLoc(), diag::err_attributes_are_not_compatible) << "'__sptr'" << "'__uptr'"; return true; } Desugared = AT->getEquivalentType(); AT = dyn_cast(Desugared); } // Pointer type qualifiers can only operate on pointer types, but not // pointer-to-member types. if (!isa(Desugared)) { if (Type->isMemberPointerType()) S.Diag(Attr.getLoc(), diag::err_attribute_no_member_pointers) << Attr.getName(); else S.Diag(Attr.getLoc(), diag::err_attribute_pointers_only) << Attr.getName() << 0; return true; } AttributedType::Kind TAK; switch (Kind) { default: llvm_unreachable("Unknown attribute kind"); case AttributeList::AT_Ptr32: TAK = AttributedType::attr_ptr32; break; case AttributeList::AT_Ptr64: TAK = AttributedType::attr_ptr64; break; case AttributeList::AT_SPtr: TAK = AttributedType::attr_sptr; break; case AttributeList::AT_UPtr: TAK = AttributedType::attr_uptr; break; } Type = S.Context.getAttributedType(TAK, Type, Type); return false; } bool Sema::checkNullabilityTypeSpecifier(QualType &type, NullabilityKind nullability, SourceLocation nullabilityLoc, bool isContextSensitive, bool allowOnArrayType) { recordNullabilitySeen(*this, nullabilityLoc); // Check for existing nullability attributes on the type. QualType desugared = type; while (auto attributed = dyn_cast(desugared.getTypePtr())) { // Check whether there is already a null if (auto existingNullability = attributed->getImmediateNullability()) { // Duplicated nullability. if (nullability == *existingNullability) { Diag(nullabilityLoc, diag::warn_nullability_duplicate) << DiagNullabilityKind(nullability, isContextSensitive) << FixItHint::CreateRemoval(nullabilityLoc); break; } // Conflicting nullability. Diag(nullabilityLoc, diag::err_nullability_conflicting) << DiagNullabilityKind(nullability, isContextSensitive) << DiagNullabilityKind(*existingNullability, false); return true; } desugared = attributed->getModifiedType(); } // If there is already a different nullability specifier, complain. // This (unlike the code above) looks through typedefs that might // have nullability specifiers on them, which means we cannot // provide a useful Fix-It. if (auto existingNullability = desugared->getNullability(Context)) { if (nullability != *existingNullability) { Diag(nullabilityLoc, diag::err_nullability_conflicting) << DiagNullabilityKind(nullability, isContextSensitive) << DiagNullabilityKind(*existingNullability, false); // Try to find the typedef with the existing nullability specifier. if (auto typedefType = desugared->getAs()) { TypedefNameDecl *typedefDecl = typedefType->getDecl(); QualType underlyingType = typedefDecl->getUnderlyingType(); if (auto typedefNullability = AttributedType::stripOuterNullability(underlyingType)) { if (*typedefNullability == *existingNullability) { Diag(typedefDecl->getLocation(), diag::note_nullability_here) << DiagNullabilityKind(*existingNullability, false); } } } return true; } } // If this definitely isn't a pointer type, reject the specifier. if (!desugared->canHaveNullability() && !(allowOnArrayType && desugared->isArrayType())) { Diag(nullabilityLoc, diag::err_nullability_nonpointer) << DiagNullabilityKind(nullability, isContextSensitive) << type; return true; } // For the context-sensitive keywords/Objective-C property // attributes, require that the type be a single-level pointer. if (isContextSensitive) { // Make sure that the pointee isn't itself a pointer type. const Type *pointeeType; if (desugared->isArrayType()) pointeeType = desugared->getArrayElementTypeNoTypeQual(); else pointeeType = desugared->getPointeeType().getTypePtr(); if (pointeeType->isAnyPointerType() || pointeeType->isObjCObjectPointerType() || pointeeType->isMemberPointerType()) { Diag(nullabilityLoc, diag::err_nullability_cs_multilevel) << DiagNullabilityKind(nullability, true) << type; Diag(nullabilityLoc, diag::note_nullability_type_specifier) << DiagNullabilityKind(nullability, false) << type << FixItHint::CreateReplacement(nullabilityLoc, getNullabilitySpelling(nullability)); return true; } } // Form the attributed type. type = Context.getAttributedType( AttributedType::getNullabilityAttrKind(nullability), type, type); return false; } bool Sema::checkObjCKindOfType(QualType &type, SourceLocation loc) { if (isa(type)) { // Build the attributed type to record where __kindof occurred. type = Context.getAttributedType(AttributedType::attr_objc_kindof, type, type); return false; } // Find out if it's an Objective-C object or object pointer type; const ObjCObjectPointerType *ptrType = type->getAs(); const ObjCObjectType *objType = ptrType ? ptrType->getObjectType() : type->getAs(); // If not, we can't apply __kindof. if (!objType) { // FIXME: Handle dependent types that aren't yet object types. Diag(loc, diag::err_objc_kindof_nonobject) << type; return true; } // Rebuild the "equivalent" type, which pushes __kindof down into // the object type. // There is no need to apply kindof on an unqualified id type. QualType equivType = Context.getObjCObjectType( objType->getBaseType(), objType->getTypeArgsAsWritten(), objType->getProtocols(), /*isKindOf=*/objType->isObjCUnqualifiedId() ? false : true); // If we started with an object pointer type, rebuild it. if (ptrType) { equivType = Context.getObjCObjectPointerType(equivType); if (auto nullability = type->getNullability(Context)) { auto attrKind = AttributedType::getNullabilityAttrKind(*nullability); equivType = Context.getAttributedType(attrKind, equivType, equivType); } } // Build the attributed type to record where __kindof occurred. type = Context.getAttributedType(AttributedType::attr_objc_kindof, type, equivType); return false; } /// Map a nullability attribute kind to a nullability kind. static NullabilityKind mapNullabilityAttrKind(AttributeList::Kind kind) { switch (kind) { case AttributeList::AT_TypeNonNull: return NullabilityKind::NonNull; case AttributeList::AT_TypeNullable: return NullabilityKind::Nullable; case AttributeList::AT_TypeNullUnspecified: return NullabilityKind::Unspecified; default: llvm_unreachable("not a nullability attribute kind"); } } /// Distribute a nullability type attribute that cannot be applied to /// the type specifier to a pointer, block pointer, or member pointer /// declarator, complaining if necessary. /// /// \returns true if the nullability annotation was distributed, false /// otherwise. static bool distributeNullabilityTypeAttr(TypeProcessingState &state, QualType type, AttributeList &attr) { Declarator &declarator = state.getDeclarator(); /// Attempt to move the attribute to the specified chunk. auto moveToChunk = [&](DeclaratorChunk &chunk, bool inFunction) -> bool { // If there is already a nullability attribute there, don't add // one. if (hasNullabilityAttr(chunk.getAttrListRef())) return false; // Complain about the nullability qualifier being in the wrong // place. enum { PK_Pointer, PK_BlockPointer, PK_MemberPointer, PK_FunctionPointer, PK_MemberFunctionPointer, } pointerKind = chunk.Kind == DeclaratorChunk::Pointer ? (inFunction ? PK_FunctionPointer : PK_Pointer) : chunk.Kind == DeclaratorChunk::BlockPointer ? PK_BlockPointer : inFunction? PK_MemberFunctionPointer : PK_MemberPointer; auto diag = state.getSema().Diag(attr.getLoc(), diag::warn_nullability_declspec) << DiagNullabilityKind(mapNullabilityAttrKind(attr.getKind()), attr.isContextSensitiveKeywordAttribute()) << type << static_cast(pointerKind); // FIXME: MemberPointer chunks don't carry the location of the *. if (chunk.Kind != DeclaratorChunk::MemberPointer) { diag << FixItHint::CreateRemoval(attr.getLoc()) << FixItHint::CreateInsertion( state.getSema().getPreprocessor() .getLocForEndOfToken(chunk.Loc), " " + attr.getName()->getName().str() + " "); } moveAttrFromListToList(attr, state.getCurrentAttrListRef(), chunk.getAttrListRef()); return true; }; // Move it to the outermost pointer, member pointer, 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: case DeclaratorChunk::MemberPointer: return moveToChunk(chunk, false); case DeclaratorChunk::Paren: case DeclaratorChunk::Array: continue; case DeclaratorChunk::Function: // Try to move past the return type to a function/block/member // function pointer. if (DeclaratorChunk *dest = maybeMovePastReturnType( declarator, i, /*onlyBlockPointers=*/false)) { return moveToChunk(*dest, true); } return false; // Don't walk through these. case DeclaratorChunk::Reference: case DeclaratorChunk::Pipe: return false; } } return false; } static AttributedType::Kind getCCTypeAttrKind(AttributeList &Attr) { assert(!Attr.isInvalid()); switch (Attr.getKind()) { default: llvm_unreachable("not a calling convention attribute"); case AttributeList::AT_CDecl: return AttributedType::attr_cdecl; case AttributeList::AT_FastCall: return AttributedType::attr_fastcall; case AttributeList::AT_StdCall: return AttributedType::attr_stdcall; case AttributeList::AT_ThisCall: return AttributedType::attr_thiscall; case AttributeList::AT_RegCall: return AttributedType::attr_regcall; case AttributeList::AT_Pascal: return AttributedType::attr_pascal; case AttributeList::AT_SwiftCall: return AttributedType::attr_swiftcall; case AttributeList::AT_VectorCall: return AttributedType::attr_vectorcall; case AttributeList::AT_Pcs: { // The attribute may have had a fixit applied where we treated an // identifier as a string literal. The contents of the string are valid, // but the form may not be. StringRef Str; if (Attr.isArgExpr(0)) Str = cast(Attr.getArgAsExpr(0))->getString(); else Str = Attr.getArgAsIdent(0)->Ident->getName(); return llvm::StringSwitch(Str) .Case("aapcs", AttributedType::attr_pcs) .Case("aapcs-vfp", AttributedType::attr_pcs_vfp); } case AttributeList::AT_IntelOclBicc: return AttributedType::attr_inteloclbicc; case AttributeList::AT_MSABI: return AttributedType::attr_ms_abi; case AttributeList::AT_SysVABI: return AttributedType::attr_sysv_abi; case AttributeList::AT_PreserveMost: return AttributedType::attr_preserve_most; case AttributeList::AT_PreserveAll: return AttributedType::attr_preserve_all; } llvm_unreachable("unexpected attribute 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) { if (attr.getNumArgs()) return true; // Delay if this is not a function type. if (!unwrapped.isFunctionType()) return false; // Check whether the return type is reasonable. if (S.checkNSReturnsRetainedReturnType(attr.getLoc(), unwrapped.get()->getReturnType())) return true; // Only actually change the underlying type in ARC builds. QualType origType = type; if (state.getSema().getLangOpts().ObjCAutoRefCount) { FunctionType::ExtInfo EI = unwrapped.get()->getExtInfo().withProducesResult(true); type = unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI)); } type = S.Context.getAttributedType(AttributedType::attr_ns_returns_retained, origType, type); return true; } if (attr.getKind() == AttributeList::AT_AnyX86NoCallerSavedRegisters) { if (S.CheckNoCallerSavedRegsAttr(attr)) return true; // Delay if this is not a function type. if (!unwrapped.isFunctionType()) return false; FunctionType::ExtInfo EI = unwrapped.get()->getExtInfo().withNoCallerSavedRegs(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(); AttributedType::Kind CCAttrKind = getCCTypeAttrKind(attr); if (CCOld != CC) { // Error out on when there's already an attribute on the type // and the CCs don't match. const AttributedType *AT = S.getCallingConvAttributedType(type); if (AT && AT->getAttrKind() != CCAttrKind) { S.Diag(attr.getLoc(), diag::err_attributes_are_not_compatible) << FunctionType::getNameForCallConv(CC) << FunctionType::getNameForCallConv(CCOld); attr.setInvalid(); return true; } } // Diagnose use of variadic functions with calling conventions that // don't support them (e.g. because they're callee-cleanup). // We delay warning about this on unprototyped function declarations // until after redeclaration checking, just in case we pick up a // prototype that way. And apparently we also "delay" warning about // unprototyped function types in general, despite not necessarily having // much ability to diagnose it later. if (!supportsVariadicCall(CC)) { const FunctionProtoType *FnP = dyn_cast(fn); if (FnP && FnP->isVariadic()) { unsigned DiagID = diag::err_cconv_varargs; // stdcall and fastcall are ignored with a warning for GCC and MS // compatibility. bool IsInvalid = true; if (CC == CC_X86StdCall || CC == CC_X86FastCall) { DiagID = diag::warn_cconv_varargs; IsInvalid = false; } S.Diag(attr.getLoc(), DiagID) << FunctionType::getNameForCallConv(CC); if (IsInvalid) attr.setInvalid(); return true; } } // Also diagnose fastcall with regparm. if (CC == CC_X86FastCall && fn->getHasRegParm()) { S.Diag(attr.getLoc(), diag::err_attributes_are_not_compatible) << "regparm" << FunctionType::getNameForCallConv(CC_X86FastCall); attr.setInvalid(); return true; } // Modify the CC from the wrapped function type, wrap it all back, and then // wrap the whole thing in an AttributedType as written. The modified type // might have a different CC if we ignored the attribute. QualType Equivalent; if (CCOld == CC) { Equivalent = type; } else { auto EI = unwrapped.get()->getExtInfo().withCallingConv(CC); Equivalent = unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI)); } type = S.Context.getAttributedType(CCAttrKind, type, Equivalent); return true; } bool Sema::hasExplicitCallingConv(QualType &T) { QualType R = T.IgnoreParens(); while (const AttributedType *AT = dyn_cast(R)) { if (AT->isCallingConv()) return true; R = AT->getModifiedType().IgnoreParens(); } return false; } void Sema::adjustMemberFunctionCC(QualType &T, bool IsStatic, bool IsCtorOrDtor, SourceLocation Loc) { FunctionTypeUnwrapper Unwrapped(*this, T); const FunctionType *FT = Unwrapped.get(); bool IsVariadic = (isa(FT) && cast(FT)->isVariadic()); CallingConv CurCC = FT->getCallConv(); CallingConv ToCC = Context.getDefaultCallingConvention(IsVariadic, !IsStatic); if (CurCC == ToCC) return; // MS compiler ignores explicit calling convention attributes on structors. We // should do the same. if (Context.getTargetInfo().getCXXABI().isMicrosoft() && IsCtorOrDtor) { // Issue a warning on ignored calling convention -- except of __stdcall. // Again, this is what MS compiler does. if (CurCC != CC_X86StdCall) Diag(Loc, diag::warn_cconv_structors) << FunctionType::getNameForCallConv(CurCC); // Default adjustment. } else { // Only adjust types with the default convention. For example, on Windows // we should adjust a __cdecl type to __thiscall for instance methods, and a // __thiscall type to __cdecl for static methods. CallingConv DefaultCC = Context.getDefaultCallingConvention(IsVariadic, IsStatic); if (CurCC != DefaultCC || DefaultCC == ToCC) return; if (hasExplicitCallingConv(T)) return; } FT = Context.adjustFunctionType(FT, FT->getExtInfo().withCallingConv(ToCC)); QualType Wrapped = Unwrapped.wrap(*this, FT); T = Context.getAdjustedType(T, Wrapped); } /// 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) << Attr.getName() << 1; Attr.setInvalid(); return; } Expr *sizeExpr = static_cast(Attr.getArgAsExpr(0)); llvm::APSInt vecSize(32); if (sizeExpr->isTypeDependent() || sizeExpr->isValueDependent() || !sizeExpr->isIntegerConstantExpr(vecSize, S.Context)) { S.Diag(Attr.getLoc(), diag::err_attribute_argument_type) << Attr.getName() << AANT_ArgumentIntegerConstant << sizeExpr->getSourceRange(); Attr.setInvalid(); return; } // The base type must be integer (not Boolean or enumeration) or float, and // can't already be a vector. if (!CurType->isBuiltinType() || CurType->isBooleanType() || (!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 (VectorType::isVectorSizeTooLarge(vectorSize / typeSize)) { S.Diag(Attr.getLoc(), diag::err_attribute_size_too_large) << 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) { // check the attribute arguments. if (Attr.getNumArgs() != 1) { S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << Attr.getName() << 1; return; } Expr *sizeExpr; // Special case where the argument is a template id. if (Attr.isArgIdent(0)) { CXXScopeSpec SS; SourceLocation TemplateKWLoc; UnqualifiedId id; id.setIdentifier(Attr.getArgAsIdent(0)->Ident, Attr.getLoc()); ExprResult Size = S.ActOnIdExpression(S.getCurScope(), SS, TemplateKWLoc, id, false, false); if (Size.isInvalid()) return; sizeExpr = Size.get(); } else { sizeExpr = Attr.getArgAsExpr(0); } // Create the vector type. QualType T = S.BuildExtVectorType(CurType, sizeExpr, Attr.getLoc()); if (!T.isNull()) CurType = T; } static bool isPermittedNeonBaseType(QualType &Ty, VectorType::VectorKind VecKind, Sema &S) { const BuiltinType *BTy = Ty->getAs(); if (!BTy) return false; llvm::Triple Triple = S.Context.getTargetInfo().getTriple(); // Signed poly is mathematically wrong, but has been baked into some ABIs by // now. bool IsPolyUnsigned = Triple.getArch() == llvm::Triple::aarch64 || Triple.getArch() == llvm::Triple::aarch64_be; if (VecKind == VectorType::NeonPolyVector) { if (IsPolyUnsigned) { // AArch64 polynomial vectors are unsigned and support poly64. return BTy->getKind() == BuiltinType::UChar || BTy->getKind() == BuiltinType::UShort || BTy->getKind() == BuiltinType::ULong || BTy->getKind() == BuiltinType::ULongLong; } else { // AArch32 polynomial vector are signed. return BTy->getKind() == BuiltinType::SChar || BTy->getKind() == BuiltinType::Short; } } // Non-polynomial vector types: the usual suspects are allowed, as well as // float64_t on AArch64. bool Is64Bit = Triple.getArch() == llvm::Triple::aarch64 || Triple.getArch() == llvm::Triple::aarch64_be; if (Is64Bit && BTy->getKind() == BuiltinType::Double) return true; return 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::Long || BTy->getKind() == BuiltinType::ULong || BTy->getKind() == BuiltinType::LongLong || BTy->getKind() == BuiltinType::ULongLong || BTy->getKind() == BuiltinType::Float || BTy->getKind() == BuiltinType::Half; } /// 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) { // Target must have NEON if (!S.Context.getTargetInfo().hasFeature("neon")) { S.Diag(Attr.getLoc(), diag::err_attribute_unsupported) << Attr.getName(); Attr.setInvalid(); return; } // Check the attribute arguments. if (Attr.getNumArgs() != 1) { S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << Attr.getName() << 1; Attr.setInvalid(); return; } // The number of elements must be an ICE. Expr *numEltsExpr = static_cast(Attr.getArgAsExpr(0)); llvm::APSInt numEltsInt(32); if (numEltsExpr->isTypeDependent() || numEltsExpr->isValueDependent() || !numEltsExpr->isIntegerConstantExpr(numEltsInt, S.Context)) { S.Diag(Attr.getLoc(), diag::err_attribute_argument_type) << Attr.getName() << AANT_ArgumentIntegerConstant << numEltsExpr->getSourceRange(); Attr.setInvalid(); return; } // Only certain element types are supported for Neon vectors. if (!isPermittedNeonBaseType(CurType, VecKind, S)) { S.Diag(Attr.getLoc(), diag::err_attribute_invalid_vector_type) << CurType; Attr.setInvalid(); return; } // The total size of the vector must be 64 or 128 bits. unsigned typeSize = static_cast(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); } /// Handle OpenCL Access Qualifier Attribute. static void HandleOpenCLAccessAttr(QualType &CurType, const AttributeList &Attr, Sema &S) { // OpenCL v2.0 s6.6 - Access qualifier can be used only for image and pipe type. if (!(CurType->isImageType() || CurType->isPipeType())) { S.Diag(Attr.getLoc(), diag::err_opencl_invalid_access_qualifier); Attr.setInvalid(); return; } if (const TypedefType* TypedefTy = CurType->getAs()) { QualType PointeeTy = TypedefTy->desugar(); S.Diag(Attr.getLoc(), diag::err_opencl_multiple_access_qualifiers); std::string PrevAccessQual; switch (cast(PointeeTy.getTypePtr())->getKind()) { #define IMAGE_TYPE(ImgType, Id, SingletonId, Access, Suffix) \ case BuiltinType::Id: \ PrevAccessQual = #Access; \ break; #include "clang/Basic/OpenCLImageTypes.def" default: assert(0 && "Unable to find corresponding image type."); } S.Diag(TypedefTy->getDecl()->getLocStart(), diag::note_opencl_typedef_access_qualifier) << PrevAccessQual; } else if (CurType->isPipeType()) { if (Attr.getSemanticSpelling() == OpenCLAccessAttr::Keyword_write_only) { QualType ElemType = CurType->getAs()->getElementType(); CurType = S.Context.getWritePipeType(ElemType); } } } static void deduceOpenCLImplicitAddrSpace(TypeProcessingState &State, QualType &T, TypeAttrLocation TAL) { Declarator &D = State.getDeclarator(); // Handle the cases where address space should not be deduced. // // The pointee type of a pointer type is alwasy deduced since a pointer always // points to some memory location which should has an address space. // // There are situations that at the point of certain declarations, the address // space may be unknown and better to be left as default. For example, when // definining a typedef or struct type, they are not associated with any // specific address space. Later on, they may be used with any address space // to declare a variable. // // The return value of a function is r-value, therefore should not have // address space. // // The void type does not occupy memory, therefore should not have address // space, except when it is used as a pointee type. // // Since LLVM assumes function type is in default address space, it should not // have address space. auto ChunkIndex = State.getCurrentChunkIndex(); bool IsPointee = ChunkIndex > 0 && (D.getTypeObject(ChunkIndex - 1).Kind == DeclaratorChunk::Pointer || D.getTypeObject(ChunkIndex - 1).Kind == DeclaratorChunk::BlockPointer); bool IsFuncReturnType = ChunkIndex > 0 && D.getTypeObject(ChunkIndex - 1).Kind == DeclaratorChunk::Function; bool IsFuncType = ChunkIndex < D.getNumTypeObjects() && D.getTypeObject(ChunkIndex).Kind == DeclaratorChunk::Function; if ( // Do not deduce addr space for function return type and function type, // otherwise it will fail some sema check. IsFuncReturnType || IsFuncType || // Do not deduce addr space for member types of struct, except the pointee // type of a pointer member type. (D.getContext() == DeclaratorContext::MemberContext && !IsPointee) || // Do not deduce addr space for types used to define a typedef and the // typedef itself, except the pointee type of a pointer type which is used // to define the typedef. (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef && !IsPointee) || // Do not deduce addr space of the void type, e.g. in f(void), otherwise // it will fail some sema check. (T->isVoidType() && !IsPointee)) return; LangAS ImpAddr; // Put OpenCL automatic variable in private address space. // OpenCL v1.2 s6.5: // The default address space name for arguments to a function in a // program, or local variables of a function is __private. All function // arguments shall be in the __private address space. if (State.getSema().getLangOpts().OpenCLVersion <= 120) { ImpAddr = LangAS::opencl_private; } else { // If address space is not set, OpenCL 2.0 defines non private default // address spaces for some cases: // OpenCL 2.0, section 6.5: // The address space for a variable at program scope or a static variable // inside a function can either be __global or __constant, but defaults to // __global if not specified. // (...) // Pointers that are declared without pointing to a named address space // point to the generic address space. if (IsPointee) { ImpAddr = LangAS::opencl_generic; } else { if (D.getContext() == DeclaratorContext::FileContext) { ImpAddr = LangAS::opencl_global; } else { if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_static || D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_extern) { ImpAddr = LangAS::opencl_global; } else { ImpAddr = LangAS::opencl_private; } } } } T = State.getSema().Context.getAddrSpaceQualType(T, ImpAddr); } 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. while (attrs) { AttributeList &attr = *attrs; attrs = attr.getNext(); // reset to the next here due to early loop continue // stmts // 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_OpenCLPrivateAddressSpace: case AttributeList::AT_OpenCLGlobalAddressSpace: case AttributeList::AT_OpenCLLocalAddressSpace: case AttributeList::AT_OpenCLConstantAddressSpace: case AttributeList::AT_OpenCLGenericAddressSpace: 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); attr.setUsedAsTypeAttr(); break; case AttributeList::AT_NeonPolyVectorType: HandleNeonVectorTypeAttr(type, attr, state.getSema(), VectorType::NeonPolyVector); attr.setUsedAsTypeAttr(); break; case AttributeList::AT_OpenCLAccess: HandleOpenCLAccessAttr(type, attr, state.getSema()); attr.setUsedAsTypeAttr(); break; MS_TYPE_ATTRS_CASELIST: if (!handleMSPointerTypeQualifierAttr(state, attr, type)) attr.setUsedAsTypeAttr(); break; NULLABILITY_TYPE_ATTRS_CASELIST: // Either add nullability here or try to distribute it. We // don't want to distribute the nullability specifier past any // dependent type, because that complicates the user model. if (type->canHaveNullability() || type->isDependentType() || type->isArrayType() || !distributeNullabilityTypeAttr(state, type, attr)) { unsigned endIndex; if (TAL == TAL_DeclChunk) endIndex = state.getCurrentChunkIndex(); else endIndex = state.getDeclarator().getNumTypeObjects(); bool allowOnArrayType = state.getDeclarator().isPrototypeContext() && !hasOuterPointerLikeChunk(state.getDeclarator(), endIndex); if (state.getSema().checkNullabilityTypeSpecifier( type, mapNullabilityAttrKind(attr.getKind()), attr.getLoc(), attr.isContextSensitiveKeywordAttribute(), allowOnArrayType)) { attr.setInvalid(); } attr.setUsedAsTypeAttr(); } break; case AttributeList::AT_ObjCKindOf: // '__kindof' must be part of the decl-specifiers. switch (TAL) { case TAL_DeclSpec: break; case TAL_DeclChunk: case TAL_DeclName: state.getSema().Diag(attr.getLoc(), diag::err_objc_kindof_wrong_position) << FixItHint::CreateRemoval(attr.getLoc()) << FixItHint::CreateInsertion( state.getDeclarator().getDeclSpec().getLocStart(), "__kindof "); break; } // Apply it regardless. if (state.getSema().checkObjCKindOfType(type, attr.getLoc())) attr.setInvalid(); attr.setUsedAsTypeAttr(); break; 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; } } if (!state.getSema().getLangOpts().OpenCL || type.getAddressSpace() != LangAS::Default) return; deduceOpenCLImplicitAddrSpace(state, type, TAL); } void Sema::completeExprArrayBound(Expr *E) { if (DeclRefExpr *DRE = dyn_cast(E->IgnoreParens())) { if (VarDecl *Var = dyn_cast(DRE->getDecl())) { if (isTemplateInstantiation(Var->getTemplateSpecializationKind())) { auto *Def = Var->getDefinition(); if (!Def) { SourceLocation PointOfInstantiation = E->getExprLoc(); InstantiateVariableDefinition(PointOfInstantiation, Var); Def = Var->getDefinition(); // If we don't already have a point of instantiation, and we managed // to instantiate a definition, this is the point of instantiation. // Otherwise, we don't request an end-of-TU instantiation, so this is // not a point of instantiation. // FIXME: Is this really the right behavior? if (Var->getPointOfInstantiation().isInvalid() && Def) { assert(Var->getTemplateSpecializationKind() == TSK_ImplicitInstantiation && "explicit instantiation with no point of instantiation"); Var->setTemplateSpecializationKind( Var->getTemplateSpecializationKind(), PointOfInstantiation); } } // Update the type to the definition's type both here and within the // expression. if (Def) { DRE->setDecl(Def); QualType T = Def->getType(); DRE->setType(T); // FIXME: Update the type on all intervening expressions. 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. } } } } /// \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(); // Incomplete array types may be completed by the initializer attached to // their definitions. For static data members of class templates and for // variable templates, we need to instantiate the definition to get this // initializer and complete the type. if (T->isIncompleteArrayType()) { completeExprArrayBound(E); T = E->getType(); } // FIXME: Are there other cases which require instantiating something other // than the type to complete the type of an expression? return RequireCompleteType(E->getExprLoc(), T, Diagnoser); } bool Sema::RequireCompleteExprType(Expr *E, unsigned DiagID) { BoundTypeDiagnoser<> 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) { if (RequireCompleteTypeImpl(Loc, T, &Diagnoser)) return true; if (const TagType *Tag = T->getAs()) { if (!Tag->getDecl()->isCompleteDefinitionRequired()) { Tag->getDecl()->setCompleteDefinitionRequired(); Consumer.HandleTagDeclRequiredDefinition(Tag->getDecl()); } } return false; } bool Sema::hasStructuralCompatLayout(Decl *D, Decl *Suggested) { llvm::DenseSet> NonEquivalentDecls; if (!Suggested) return false; // FIXME: Add a specific mode for C11 6.2.7/1 in StructuralEquivalenceContext // and isolate from other C++ specific checks. StructuralEquivalenceContext Ctx( D->getASTContext(), Suggested->getASTContext(), NonEquivalentDecls, false /*StrictTypeSpelling*/, true /*Complain*/, true /*ErrorOnTagTypeMismatch*/); return Ctx.IsStructurallyEquivalent(D, Suggested); } /// \brief Determine whether there is any declaration of \p D that was ever a /// definition (perhaps before module merging) and is currently visible. /// \param D The definition of the entity. /// \param Suggested Filled in with the declaration that should be made visible /// in order to provide a definition of this entity. /// \param OnlyNeedComplete If \c true, we only need the type to be complete, /// not defined. This only matters for enums with a fixed underlying /// type, since in all other cases, a type is complete if and only if it /// is defined. bool Sema::hasVisibleDefinition(NamedDecl *D, NamedDecl **Suggested, bool OnlyNeedComplete) { // Easy case: if we don't have modules, all declarations are visible. if (!getLangOpts().Modules && !getLangOpts().ModulesLocalVisibility) return true; // If this definition was instantiated from a template, map back to the // pattern from which it was instantiated. if (isa(D) && cast(D)->isBeingDefined()) { // We're in the middle of defining it; this definition should be treated // as visible. return true; } else if (auto *RD = dyn_cast(D)) { if (auto *Pattern = RD->getTemplateInstantiationPattern()) RD = Pattern; D = RD->getDefinition(); } else if (auto *ED = dyn_cast(D)) { if (auto *Pattern = ED->getTemplateInstantiationPattern()) ED = Pattern; if (OnlyNeedComplete && ED->isFixed()) { // If the enum has a fixed underlying type, and we're only looking for a // complete type (not a definition), any visible declaration of it will // do. *Suggested = nullptr; for (auto *Redecl : ED->redecls()) { if (isVisible(Redecl)) return true; if (Redecl->isThisDeclarationADefinition() || (Redecl->isCanonicalDecl() && !*Suggested)) *Suggested = Redecl; } return false; } D = ED->getDefinition(); } else if (auto *FD = dyn_cast(D)) { if (auto *Pattern = FD->getTemplateInstantiationPattern()) FD = Pattern; D = FD->getDefinition(); } else if (auto *VD = dyn_cast(D)) { if (auto *Pattern = VD->getTemplateInstantiationPattern()) VD = Pattern; D = VD->getDefinition(); } assert(D && "missing definition for pattern of instantiated definition"); *Suggested = D; if (isVisible(D)) return true; // The external source may have additional definitions of this entity that are // visible, so complete the redeclaration chain now and ask again. if (auto *Source = Context.getExternalSource()) { Source->CompleteRedeclChain(D); return isVisible(D); } return false; } /// Locks in the inheritance model for the given class and all of its bases. static void assignInheritanceModel(Sema &S, CXXRecordDecl *RD) { RD = RD->getMostRecentDecl(); if (!RD->hasAttr()) { MSInheritanceAttr::Spelling IM; switch (S.MSPointerToMemberRepresentationMethod) { case LangOptions::PPTMK_BestCase: IM = RD->calculateInheritanceModel(); break; case LangOptions::PPTMK_FullGeneralitySingleInheritance: IM = MSInheritanceAttr::Keyword_single_inheritance; break; case LangOptions::PPTMK_FullGeneralityMultipleInheritance: IM = MSInheritanceAttr::Keyword_multiple_inheritance; break; case LangOptions::PPTMK_FullGeneralityVirtualInheritance: IM = MSInheritanceAttr::Keyword_unspecified_inheritance; break; } RD->addAttr(MSInheritanceAttr::CreateImplicit( S.getASTContext(), IM, /*BestCase=*/S.MSPointerToMemberRepresentationMethod == LangOptions::PPTMK_BestCase, S.ImplicitMSInheritanceAttrLoc.isValid() ? S.ImplicitMSInheritanceAttrLoc : RD->getSourceRange())); S.Consumer.AssignInheritanceModel(RD); } } /// \brief The implementation of RequireCompleteType bool Sema::RequireCompleteTypeImpl(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"); // We lock in the inheritance model once somebody has asked us to ensure // that a pointer-to-member type is complete. if (Context.getTargetInfo().getCXXABI().isMicrosoft()) { if (const MemberPointerType *MPTy = T->getAs()) { if (!MPTy->getClass()->isDependentType()) { (void)isCompleteType(Loc, QualType(MPTy->getClass(), 0)); assignInheritanceModel(*this, MPTy->getMostRecentCXXRecordDecl()); } } } NamedDecl *Def = nullptr; bool Incomplete = T->isIncompleteType(&Def); // Check that any necessary explicit specializations are visible. For an // enum, we just need the declaration, so don't check this. if (Def && !isa(Def)) checkSpecializationVisibility(Loc, Def); // If we have a complete type, we're done. if (!Incomplete) { // If we know about the definition but it is not visible, complain. NamedDecl *SuggestedDef = nullptr; if (Def && !hasVisibleDefinition(Def, &SuggestedDef, /*OnlyNeedComplete*/true)) { // If the user is going to see an error here, recover by making the // definition visible. bool TreatAsComplete = Diagnoser && !isSFINAEContext(); if (Diagnoser) diagnoseMissingImport(Loc, SuggestedDef, MissingImportKind::Definition, /*Recover*/TreatAsComplete); return !TreatAsComplete; } return false; } const TagType *Tag = T->getAs(); const ObjCInterfaceType *IFace = T->getAs(); // If there's an unimported definition of this type in a module (for // instance, because we forward declared it, then imported the definition), // import that definition now. // // FIXME: What about other cases where an import extends a redeclaration // chain for a declaration that can be accessed through a mechanism other // than name lookup (eg, referenced in a template, or a variable whose type // could be completed by the module)? // // FIXME: Should we map through to the base array element type before // checking for a tag type? if (Tag || IFace) { NamedDecl *D = Tag ? static_cast(Tag->getDecl()) : IFace->getDecl(); // Avoid diagnosing invalid decls as incomplete. if (D->isInvalidDecl()) return true; // Give the external AST source a chance to complete the type. if (auto *Source = Context.getExternalSource()) { if (Tag) { TagDecl *TagD = Tag->getDecl(); if (TagD->hasExternalLexicalStorage()) Source->CompleteType(TagD); } else { ObjCInterfaceDecl *IFaceD = IFace->getDecl(); if (IFaceD->hasExternalLexicalStorage()) Source->CompleteType(IFace->getDecl()); } // If the external source completed the type, go through the motions // again to ensure we're allowed to use the completed type. if (!T->isIncompleteType()) return RequireCompleteTypeImpl(Loc, T, Diagnoser); } } // 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()) { bool Instantiated = false; bool Diagnosed = false; if (ClassTemplateSpecializationDecl *ClassTemplateSpec = dyn_cast(Record->getDecl())) { if (ClassTemplateSpec->getSpecializationKind() == TSK_Undeclared) { Diagnosed = InstantiateClassTemplateSpecialization( Loc, ClassTemplateSpec, TSK_ImplicitInstantiation, /*Complain=*/Diagnoser); Instantiated = true; } } 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) { Diagnosed = InstantiateClass(Loc, Rec, Pattern, getTemplateInstantiationArgs(Rec), TSK_ImplicitInstantiation, /*Complain=*/Diagnoser); Instantiated = true; } } } if (Instantiated) { // Instantiate* might have already complained that the template is not // defined, if we asked it to. if (Diagnoser && Diagnosed) return true; // If we instantiated a definition, check that it's usable, even if // instantiation produced an error, so that repeated calls to this // function give consistent answers. if (!T->isIncompleteType()) return RequireCompleteTypeImpl(Loc, T, Diagnoser); } } // FIXME: If we didn't instantiate a definition because of an explicit // specialization declaration, check that it's visible. if (!Diagnoser) return true; 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); // If we have external information that we can use to suggest a fix, // produce a note. if (ExternalSource) ExternalSource->MaybeDiagnoseMissingCompleteType(Loc, T); return true; } bool Sema::RequireCompleteType(SourceLocation Loc, QualType T, unsigned DiagID) { BoundTypeDiagnoser<> 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); if ((isCompleteType(Loc, ElemType) || ElemType->isVoidType()) && T->isLiteralType(Context)) return false; 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 (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 (const auto &I : RD->vbases()) 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 (const auto &I : RD->bases()) { if (!I.getType()->isLiteralType(Context)) { Diag(I.getLocStart(), diag::note_non_literal_base_class) << RD << I.getType() << I.getSourceRange(); return true; } } for (const auto *I : RD->fields()) { if (!I->getType()->isLiteralType(Context) || 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) { BoundTypeDiagnoser<> 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 = SS.getScopeRep(); else { if (Keyword == ETK_None) return T; NNS = nullptr; } return Context.getElaboratedType(Keyword, NNS, T); } QualType Sema::BuildTypeofExprType(Expr *E, SourceLocation Loc) { ExprResult ER = CheckPlaceholderExpr(E); if (ER.isInvalid()) return QualType(); E = ER.get(); if (!getLangOpts().CPlusPlus && E->refersToBitField()) Diag(E->getExprLoc(), diag::err_sizeof_alignof_typeof_bitfield) << 2; 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(); } else if (auto *PE = dyn_cast(E)) { return PE->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, bool AsUnevaluated) { ExprResult ER = CheckPlaceholderExpr(E); if (ER.isInvalid()) return QualType(); E = ER.get(); if (AsUnevaluated && CodeSynthesisContexts.empty() && E->HasSideEffects(Context, false)) { // The expression operand for decltype is in an unevaluated expression // context, so side effects could result in unintended consequences. Diag(E->getExprLoc(), diag::warn_side_effects_unevaluated_context); } 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()) { // The enum could be incomplete if we're parsing its definition or // recovering from an error. NamedDecl *FwdDecl = nullptr; if (BaseType->isIncompleteType(&FwdDecl)) { Diag(Loc, diag::err_underlying_type_of_incomplete_enum) << BaseType; Diag(FwdDecl->getLocation(), diag::note_forward_declaration) << FwdDecl; return QualType(); } 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); }