| //===--- 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/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() != Declarator::BlockLiteralContext || |
| D.getDeclSpec().hasTypeSpecifier()) |
| return false; |
| |
| if (D.getNumTypeObjects() == 0) |
| return true; // ^{ ... } |
| |
| if (D.getNumTypeObjects() == 1 && |
| D.getTypeObject(0).Kind == DeclaratorChunk::Function) |
| return true; // ^(int X, float Y) { ... } |
| |
| return false; |
| } |
| |
| /// diagnoseBadTypeAttribute - Diagnoses a type attribute which |
| /// doesn't apply to the given type. |
| static void diagnoseBadTypeAttribute(Sema &S, const AttributeList &attr, |
| QualType type) { |
| 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_NoReturn: \ |
| case AttributeList::AT_Regparm: \ |
| 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<AttributeList*, 2> savedAttrs; |
| |
| /// A list of attributes to diagnose the uselessness of when the |
| /// processing is complete. |
| SmallVector<AttributeList*, 2> 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<DeclSpec&>(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; |
| |
| // 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; |
| |
| case AttributeList::AT_NSReturnsRetained: |
| if (!state.getSema().getLangOpts().ObjCAutoRefCount) |
| break; |
| // fallthrough |
| |
| 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<DeclSpec::TQ, SourceLocation> 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.ActiveTemplateInstantiations.empty()) { |
| 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<TypeSourceInfo *> typeArgs, |
| SourceRange typeArgsRange, |
| bool failOnError = false) { |
| // We can only apply type arguments to an Objective-C class type. |
| const auto *objcObjectType = type->getAs<ObjCObjectType>(); |
| 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<QualType, 4> 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<AttributedTypeLoc>()) { |
| 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<PackExpansionType>()) |
| 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<ObjCObjectPointerType>()) { |
| // 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<ObjCObjectPointerType>(); |
| |
| // 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<ObjCProtocolDecl *> Protocols, |
| ArrayRef<SourceLocation> 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<TypeSourceInfo *> TypeArgs, |
| SourceLocation TypeArgsRAngleLoc, |
| SourceLocation ProtocolLAngleLoc, |
| ArrayRef<ObjCProtocolDecl *> Protocols, |
| ArrayRef<SourceLocation> 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<Decl *> protocols, |
| ArrayRef<SourceLocation> protocolLocs, |
| SourceLocation rAngleLoc) { |
| // Form id<protocol-list>. |
| 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<ObjCObjectPointerTypeLoc>(); |
| ObjCObjectPointerTL.setStarLoc(SourceLocation()); // implicit |
| |
| auto ObjCObjectTL = ObjCObjectPointerTL.getPointeeLoc() |
| .castAs<ObjCObjectTypeLoc>(); |
| 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<ParsedType> TypeArgs, |
| SourceLocation TypeArgsRAngleLoc, |
| SourceLocation ProtocolLAngleLoc, |
| ArrayRef<Decl *> Protocols, |
| ArrayRef<SourceLocation> 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<TypeSourceInfo *, 4> 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<Proto1, Proto2> or Class<Proto1, Proto2>, we'll have an |
| // object pointer type. Fill in source information for it. |
| if (auto ObjCObjectPointerTL = ResultTL.getAs<ObjCObjectPointerTypeLoc>()) { |
| // The '*' is implicit. |
| ObjCObjectPointerTL.setStarLoc(SourceLocation()); |
| ResultTL = ObjCObjectPointerTL.getPointeeLoc(); |
| } |
| |
| auto ObjCObjectTL = ResultTL.castAs<ObjCObjectTypeLoc>(); |
| |
| // 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<OpenCLAccessAttr::Spelling>( |
| 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() == Declarator::LambdaExprContext) { |
| // In C++1y, a lambda's implicit return type is 'auto'. |
| Result = Context.getAutoDeductType(); |
| break; |
| } else if (declarator.getContext() == Declarator::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(); |
| } |
| } |
| |
| // FALL THROUGH. |
| case DeclSpec::TST_int: { |
| if (DS.getTypeSpecSign() != DeclSpec::TSS_unsigned) { |
| switch (DS.getTypeSpecWidth()) { |
| case DeclSpec::TSW_unspecified: Result = Context.IntTy; break; |
| case DeclSpec::TSW_short: Result = Context.ShortTy; break; |
| case DeclSpec::TSW_long: Result = Context.LongTy; break; |
| case DeclSpec::TSW_longlong: |
| Result = Context.LongLongTy; |
| |
| // 'long long' is a C99 or C++11 feature. |
| if (!S.getLangOpts().C99) { |
| if (S.getLangOpts().CPlusPlus) |
| S.Diag(DS.getTypeSpecWidthLoc(), |
| S.getLangOpts().CPlusPlus11 ? |
| diag::warn_cxx98_compat_longlong : diag::ext_cxx11_longlong); |
| else |
| S.Diag(DS.getTypeSpecWidthLoc(), diag::ext_c99_longlong); |
| } |
| break; |
| } |
| } else { |
| switch (DS.getTypeSpecWidth()) { |
| case DeclSpec::TSW_unspecified: Result = Context.UnsignedIntTy; break; |
| case DeclSpec::TSW_short: Result = Context.UnsignedShortTy; break; |
| case DeclSpec::TSW_long: Result = Context.UnsignedLongTy; break; |
| case DeclSpec::TSW_longlong: |
| Result = Context.UnsignedLongLongTy; |
| |
| // 'long long' is a C99 or C++11 feature. |
| if (!S.getLangOpts().C99) { |
| if (S.getLangOpts().CPlusPlus) |
| S.Diag(DS.getTypeSpecWidthLoc(), |
| S.getLangOpts().CPlusPlus11 ? |
| diag::warn_cxx98_compat_longlong : diag::ext_cxx11_longlong); |
| else |
| S.Diag(DS.getTypeSpecWidthLoc(), diag::ext_c99_longlong); |
| } |
| break; |
| } |
| } |
| break; |
| } |
| case DeclSpec::TST_int128: |
| if (!S.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_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<TypeDecl>(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<TagType>()) |
| S.DiagnoseUseOfDecl(TT->getDecl(), DS.getTypeSpecTypeLoc()); |
| // TypeQuals handled by caller. |
| Result = Context.getTypeOfType(Result); |
| break; |
| case DeclSpec::TST_typeofExpr: { |
| Expr *E = DS.getRepAsExpr(); |
| assert(E && "Didn't get an expression for typeof?"); |
| // TypeQuals handled by caller. |
| Result = S.BuildTypeofExprType(E, DS.getTypeSpecTypeLoc()); |
| if (Result.isNull()) { |
| Result = Context.IntTy; |
| declarator.setInvalidType(true); |
| } |
| break; |
| } |
| case DeclSpec::TST_decltype: { |
| Expr *E = DS.getRepAsExpr(); |
| assert(E && "Didn't get an expression for decltype?"); |
| // TypeQuals handled by caller. |
| Result = S.BuildDecltypeType(E, DS.getTypeSpecTypeLoc()); |
| if (Result.isNull()) { |
| Result = Context.IntTy; |
| declarator.setInvalidType(true); |
| } |
| break; |
| } |
| case DeclSpec::TST_underlyingType: |
| Result = S.GetTypeFromParser(DS.getRepAsType()); |
| assert(!Result.isNull() && "Didn't get a type for __underlying_type?"); |
| Result = S.BuildUnaryTransformType(Result, |
| UnaryTransformType::EnumUnderlyingType, |
| DS.getTypeSpecTypeLoc()); |
| if (Result.isNull()) { |
| Result = Context.IntTy; |
| declarator.setInvalidType(true); |
| } |
| break; |
| |
| case DeclSpec::TST_auto: |
| // TypeQuals handled by caller. |
| // If auto is mentioned in a lambda parameter context, convert it to a |
| // template parameter type immediately, with the appropriate depth and |
| // index, and update sema's state (LambdaScopeInfo) for the current lambda |
| // being analyzed (which tracks the invented type template parameter). |
| if (declarator.getContext() == Declarator::LambdaExprParameterContext) { |
| sema::LambdaScopeInfo *LSI = S.getCurLambda(); |
| assert(LSI && "No LambdaScopeInfo on the stack!"); |
| const unsigned TemplateParameterDepth = LSI->AutoTemplateParameterDepth; |
| const unsigned AutoParameterPosition = LSI->AutoTemplateParams.size(); |
| const bool IsParameterPack = declarator.hasEllipsis(); |
| |
| // Turns out we must create the TemplateTypeParmDecl here to |
| // retrieve the corresponding template parameter type. |
| TemplateTypeParmDecl *CorrespondingTemplateParam = |
| TemplateTypeParmDecl::Create(Context, |
| // Temporarily add to the TranslationUnit DeclContext. When the |
| // associated TemplateParameterList is attached to a template |
| // declaration (such as FunctionTemplateDecl), the DeclContext |
| // for each template parameter gets updated appropriately via |
| // a call to AdoptTemplateParameterList. |
| Context.getTranslationUnitDecl(), |
| /*KeyLoc*/ SourceLocation(), |
| /*NameLoc*/ declarator.getLocStart(), |
| TemplateParameterDepth, |
| AutoParameterPosition, // our template param index |
| /* Identifier*/ nullptr, false, IsParameterPack); |
| LSI->AutoTemplateParams.push_back(CorrespondingTemplateParam); |
| // Replace the 'auto' in the function parameter with this invented |
| // template type parameter. |
| Result = QualType(CorrespondingTemplateParam->getTypeForDecl(), 0); |
| } else { |
| 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<unsigned>(Context.getTypeSize(Result)); |
| assert(typeSize > 0 && "type size for vector must be greater than 0 bits"); |
| VectorType::VectorKind VecKind = VectorType::AltiVecVector; |
| if (DS.isTypeAltiVecPixel()) |
| VecKind = VectorType::AltiVecPixel; |
| else if (DS.isTypeAltiVecBool()) |
| VecKind = VectorType::AltiVecBool; |
| Result = Context.getVectorType(Result, 128/typeSize, VecKind); |
| } |
| |
| // FIXME: Imaginary. |
| if (DS.getTypeSpecComplex() == DeclSpec::TSC_imaginary) |
| S.Diag(DS.getTypeSpecComplexLoc(), diag::err_imaginary_not_supported); |
| |
| // Before we process any type attributes, synthesize a block literal |
| // function declarator if necessary. |
| if (declarator.getContext() == Declarator::BlockLiteralContext) |
| maybeSynthesizeBlockSignature(state, Result); |
| |
| // Apply any type attributes from the decl spec. This may cause the |
| // list of type attributes to be temporarily saved while the type |
| // attributes are pushed around. |
| // 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<MemberPointerType>()) |
| 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<FunctionProtoType>(); |
| if (!FPT || (FPT->getTypeQuals() == 0 && FPT->getRefQualifier() == RQ_None)) |
| return false; |
| |
| S.Diag(Loc, diag::err_compound_qualified_function_type) |
| << QFK << isa<FunctionType>(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 (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<LValueReferenceType>(); |
| |
| // 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<MemberPointerType>()) |
| 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<RecordType>()) { |
| // 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(); |
| } |
| // CUDA device code doesn't support VLAs. |
| if (getLangOpts().CUDA && T->isVariableArrayType()) |
| CUDADiagIfDeviceCode(Loc, diag::err_cuda_vla) << CurrentCUDATarget(); |
| |
| // 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<unsigned>(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; |
| return 0; |
| } |
| |
| 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<QualType> paramTypes, |
| const FunctionProtoType::ExtProtoInfo &EPI, |
| llvm::function_ref<SourceLocation(unsigned)> 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<QualType> 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 (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<LocInfoType>(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() == UnqualifiedId::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 UnqualifiedId::IK_ImplicitSelfParam: |
| case UnqualifiedId::IK_OperatorFunctionId: |
| case UnqualifiedId::IK_Identifier: |
| case UnqualifiedId::IK_LiteralOperatorId: |
| case UnqualifiedId::IK_TemplateId: |
| T = ConvertDeclSpecToType(state); |
| |
| if (!D.isInvalidType() && D.getDeclSpec().isTypeSpecOwned()) { |
| OwnedTagDecl = cast<TagDecl>(D.getDeclSpec().getRepAsDecl()); |
| // Owned declaration is embedded in declarator. |
| OwnedTagDecl->setEmbeddedInDeclarator(true); |
| } |
| break; |
| |
| case UnqualifiedId::IK_ConstructorName: |
| case UnqualifiedId::IK_ConstructorTemplateId: |
| case UnqualifiedId::IK_DestructorName: |
| // Constructors and destructors don't have return types. Use |
| // "void" instead. |
| T = SemaRef.Context.VoidTy; |
| processTypeAttrs(state, T, TAL_DeclSpec, |
| D.getDeclSpec().getAttributes().getList()); |
| break; |
| |
| case UnqualifiedId::IK_ConversionFunctionId: |
| // The result type of a conversion function is the type that it |
| // converts to. |
| T = SemaRef.GetTypeFromParser(D.getName().ConversionFunctionId, |
| &ReturnTypeInfo); |
| break; |
| } |
| |
| if (D.getAttributes()) |
| distributeTypeAttrsFromDeclarator(state, T); |
| |
| // C++11 [dcl.spec.auto]p5: reject 'auto' if it is not in an allowed context. |
| if (D.getDeclSpec().containsPlaceholderType()) { |
| int Error = -1; |
| |
| switch (D.getContext()) { |
| case Declarator::LambdaExprContext: |
| llvm_unreachable("Can't specify a type specifier in lambda grammar"); |
| case Declarator::ObjCParameterContext: |
| case Declarator::ObjCResultContext: |
| case Declarator::PrototypeContext: |
| Error = 0; |
| break; |
| case Declarator::LambdaExprParameterContext: |
| // In C++14, generic lambdas allow 'auto' in their parameters. |
| if (!(SemaRef.getLangOpts().CPlusPlus14 |
| && D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_auto)) |
| Error = 16; |
| break; |
| case Declarator::MemberContext: { |
| if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_static || |
| D.isFunctionDeclarator()) |
| break; |
| bool Cxx = SemaRef.getLangOpts().CPlusPlus; |
| switch (cast<TagDecl>(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; |
| } |
| break; |
| } |
| case Declarator::CXXCatchContext: |
| case Declarator::ObjCCatchContext: |
| Error = 7; // Exception declaration |
| break; |
| case Declarator::TemplateParamContext: |
| if (!SemaRef.getLangOpts().CPlusPlus1z) |
| Error = 8; // Template parameter |
| break; |
| case Declarator::BlockLiteralContext: |
| Error = 9; // Block literal |
| break; |
| case Declarator::TemplateTypeArgContext: |
| Error = 10; // Template type argument |
| break; |
| case Declarator::AliasDeclContext: |
| case Declarator::AliasTemplateContext: |
| Error = 12; // Type alias |
| break; |
| case Declarator::TrailingReturnContext: |
| if (!SemaRef.getLangOpts().CPlusPlus14 || |
| D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_auto_type) |
| Error = 13; // Function return type |
| break; |
| case Declarator::ConversionIdContext: |
| if (!SemaRef.getLangOpts().CPlusPlus14 || |
| D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_auto_type) |
| Error = 14; // conversion-type-id |
| break; |
| case Declarator::TypeNameContext: |
| Error = 15; // Generic |
| break; |
| case Declarator::FileContext: |
| case Declarator::BlockContext: |
| case Declarator::ForContext: |
| case Declarator::InitStmtContext: |
| case Declarator::ConditionContext: |
| break; |
| case Declarator::CXXNewContext: |
| if (D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_auto_type) |
| Error = 17; // 'new' type |
| break; |
| case Declarator::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 || |
| D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_auto_type)) |
| 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. |
| if (SemaRef.getLangOpts().CPlusPlus11 && |
| D.getDeclSpec().getTypeSpecType() != DeclSpec::TST_auto_type) { |
| for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { |
| unsigned chunkIndex = e - i - 1; |
| state.setCurrentChunkIndex(chunkIndex); |
| DeclaratorChunk &DeclType = D.getTypeObject(chunkIndex); |
| if (DeclType.Kind == DeclaratorChunk::Function) { |
| const DeclaratorChunk::FunctionTypeInfo &FTI = DeclType.Fun; |
| if (FTI.hasTrailingReturnType()) { |
| HaveTrailing = true; |
| Error = -1; |
| break; |
| } |
| } |
| } |
| } |
| |
| SourceRange AutoRange = D.getDeclSpec().getTypeSpecTypeLoc(); |
| if (D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) |
| AutoRange = D.getName().getSourceRange(); |
| |
| if (Error != -1) { |
| unsigned Keyword; |
| switch (D.getDeclSpec().getTypeSpecType()) { |
| case DeclSpec::TST_auto: Keyword = 0; break; |
| case DeclSpec::TST_decltype_auto: Keyword = 1; break; |
| case DeclSpec::TST_auto_type: Keyword = 2; break; |
| default: llvm_unreachable("unknown auto TypeSpecType"); |
| } |
| SemaRef.Diag(AutoRange.getBegin(), diag::err_auto_not_allowed) |
| << Keyword << Error << AutoRange; |
| 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 Declarator::TrailingReturnContext: |
| // Class and enumeration definitions are syntactically not allowed in |
| // trailing return types. |
| llvm_unreachable("parser should not have allowed this"); |
| break; |
| case Declarator::FileContext: |
| case Declarator::MemberContext: |
| case Declarator::BlockContext: |
| case Declarator::ForContext: |
| case Declarator::InitStmtContext: |
| case Declarator::BlockLiteralContext: |
| case Declarator::LambdaExprContext: |
| // C++11 [dcl.type]p3: |
| // A type-specifier-seq shall not define a class or enumeration unless |
| // it appears in the type-id of an alias-declaration (7.1.3) that is not |
| // the declaration of a template-declaration. |
| case Declarator::AliasDeclContext: |
| break; |
| case Declarator::AliasTemplateContext: |
| DiagID = diag::err_type_defined_in_alias_template; |
| break; |
| case Declarator::TypeNameContext: |
| case Declarator::ConversionIdContext: |
| case Declarator::TemplateParamContext: |
| case Declarator::CXXNewContext: |
| case Declarator::CXXCatchContext: |
| case Declarator::ObjCCatchContext: |
| case Declarator::TemplateTypeArgContext: |
| DiagID = diag::err_type_defined_in_type_specifier; |
| break; |
| case Declarator::PrototypeContext: |
| case Declarator::LambdaExprParameterContext: |
| case Declarator::ObjCParameterContext: |
| case Declarator::ObjCResultContext: |
| case Declarator::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 Declarator::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() == Declarator::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(); |
| } |
| } |
| |
| 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); |
| } |
| } |
| } |
| |
| /// 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() == Declarator::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) { |
| llvm::Triple::ArchType arch = S.Context.getTargetInfo().getTriple().getArch(); |
| if (arch == llvm::Triple::spir || arch == llvm::Triple::spir64 || |
| arch == llvm::Triple::amdgcn || arch == llvm::Triple::r600) { |
| 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<PointerType>()) { |
| ++numNormalPointers; |
| |
| if (numNormalPointers > 2) |
| return PointerDeclaratorKind::MultiLevelPointer; |
| |
| type = ptrType->getPointeeType(); |
| ++numTypeSpecifierPointers; |
| continue; |
| } |
| |
| // Decompose block pointers. |
| if (type->getAs<BlockPointerType>()) { |
| return numNormalPointers > 0 ? PointerDeclaratorKind::MultiLevelPointer |
| : PointerDeclaratorKind::SingleLevelPointer; |
| } |
| |
| // Decompose member pointers. |
| if (type->getAs<MemberPointerType>()) { |
| return numNormalPointers > 0 ? PointerDeclaratorKind::MultiLevelPointer |
| : PointerDeclaratorKind::SingleLevelPointer; |
| } |
| |
| // Look at Objective-C object pointers. |
| if (auto objcObjectPtr = type->getAs<ObjCObjectPointerType>()) { |
| ++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<ObjCInterfaceType>()) { |
| 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<RecordType>()) { |
| RecordDecl *recordDecl = recordType->getDecl(); |
| |
| // If this is CFErrorRef*, report it as such. |
| if (numNormalPointers == 2 && numTypeSpecifierPointers < 2 && |
| S.isCFError(recordDecl)) { |
| 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; |
| } |
| } |
| |
| bool Sema::isCFError(RecordDecl *recordDecl) { |
| // If we already know about CFError, test it directly. |
| if (CFError) { |
| return (CFError == recordDecl); |
| } |
| |
| // Check whether this is CFError, which we identify based on being |
| // bridged to NSError. |
| if (recordDecl->getTagKind() == TTK_Struct) { |
| if (auto bridgeAttr = recordDecl->getAttr<ObjCBridgeAttr>()) { |
| if (bridgeAttr->getBridgedType() == getNSErrorIdent()) { |
| CFError = recordDecl; |
| return true; |
| } |
| } |
| } |
| |
| return false; |
| } |
| |
| 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) { |
| 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<unsigned>(PointerKind); |
| } |
| |
| if (PointerLoc.isMacroID()) |
| return; |
| |
| auto addFixIt = [&](NullabilityKind Nullability) { |
| auto Diag = S.Diag(PointerLoc, diag::note_nullability_fix_it); |
| Diag << static_cast<unsigned>(Nullability); |
| Diag << static_cast<unsigned>(PointerKind); |
| fixItNullability(S, Diag, PointerLoc, 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) { |
| // 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.PointerKind = static_cast<unsigned>(pointerKind); |
| } |
| |
| return; |
| } |
| |
| // Complain about missing nullability. |
| emitNullabilityConsistencyWarning(S, pointerKind, pointerLoc); |
| } |
| |
| /// 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<SimplePointerKind>(fileNullability.PointerKind); |
| emitNullabilityConsistencyWarning(S, kind, fileNullability.PointerLoc); |
| } |
| |
| /// 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() == Declarator::AliasDeclContext || |
| D.getContext() == Declarator::AliasTemplateContext; |
| |
| // Does T refer to a function type with a cv-qualifier or a ref-qualifier? |
| bool IsQualifiedFunction = T->isFunctionProtoType() && |
| (T->castAs<FunctionProtoType>()->getTypeQuals() != 0 || |
| T->castAs<FunctionProtoType>()->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 (const AutoType *AT = T->getAs<AutoType>()) { |
| if (AT->isDecltypeAuto()) { |
| for (unsigned I = 0, E = D.getNumTypeObjects(); I != E; ++I) { |
| unsigned Index = E - I - 1; |
| DeclaratorChunk &DeclChunk = D.getTypeObject(Index); |
| unsigned DiagId = diag::err_decltype_auto_compound_type; |
| unsigned DiagKind = 0; |
| switch (DeclChunk.Kind) { |
| case DeclaratorChunk::Paren: |
| continue; |
| case DeclaratorChunk::Function: { |
| 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<NullabilityKind> 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; |
| |
| auto isDependentNonPointerType = [](QualType T) -> bool { |
| // Note: This is intended to be the same check as Type::canHaveNullability |
| // except with all of the ambiguous cases being treated as 'false' rather |
| // than 'true'. |
| return T->isDependentType() && !T->isAnyPointerType() && |
| !T->isBlockPointerType() && !T->isMemberPointerType(); |
| }; |
| |
| if (T->canHaveNullability() && !T->getNullability(S.Context) && |
| !isDependentNonPointerType(T)) { |
| // 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 Declarator::ObjCParameterContext: |
| case Declarator::ObjCResultContext: |
| case Declarator::PrototypeContext: |
| case Declarator::TrailingReturnContext: |
| isFunctionOrMethod = true; |
| // fallthrough |
| |
| case Declarator::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; |
| } |
| |
| // fallthrough |
| |
| case Declarator::FileContext: |
| case Declarator::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 == Declarator::ObjCParameterContext || |
| context == Declarator::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 Declarator::ConversionIdContext: |
| complainAboutMissingNullability = CAMN_Yes; |
| break; |
| |
| case Declarator::AliasDeclContext: |
| case Declarator::AliasTemplateContext: |
| case Declarator::BlockContext: |
| case Declarator::BlockLiteralContext: |
| case Declarator::ConditionContext: |
| case Declarator::CXXCatchContext: |
| case Declarator::CXXNewContext: |
| case Declarator::ForContext: |
| case Declarator::InitStmtContext: |
| case Declarator::LambdaExprContext: |
| case Declarator::LambdaExprParameterContext: |
| case Declarator::ObjCCatchContext: |
| case Declarator::TemplateParamContext: |
| case Declarator::TemplateTypeArgContext: |
| case Declarator::TypeNameContext: |
| // 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<TypedefType>(); |
| 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<TypedefType>(); |
| } 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, |
| 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<int>(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; |
| // Fallthrough. |
| |
| case CAMN_Yes: |
| checkNullabilityConsistency(S, pointerKind, pointerLoc); |
| } |
| return nullptr; |
| }; |
| |
| // If the type itself could have nullability but does not, infer pointer |
| // nullability and perform consistency checking. |
| if (S.ActiveTemplateInstantiations.empty()) { |
| if (T->canHaveNullability() && !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.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: |
| 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.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.getAttrListRef()); |
| |
| if (LangOpts.ObjC1 && T->getAs<ObjCObjectType>()) { |
| 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<Expr*>(ATI.NumElts); |
| ArrayType::ArraySizeModifier ASM; |
| if (ATI.isStar) |
| ASM = ArrayType::Star; |
| else if (ATI.hasStatic) |
| ASM = ArrayType::Static; |
| else |
| ASM = ArrayType::Normal; |
| if (ASM == ArrayType::Star && !D.isPrototypeContext()) { |
| // FIXME: This check isn't quite right: it allows star in prototypes |
| // for function definitions, and disallows some edge cases detailed |
| // in http://gcc.gnu.org/ml/gcc-patches/2009-02/msg00133.html |
| S.Diag(DeclType.Loc, diag::err_array_star_outside_prototype); |
| ASM = ArrayType::Normal; |
| D.setInvalidType(true); |
| } |
| |
| // C99 6.7.5.2p1: The optional type qualifiers and the keyword static |
| // shall appear only in a declaration of a function parameter with an |
| // array type, ... |
| if (ASM == ArrayType::Static || ATI.TypeQuals) { |
| if (!(D.isPrototypeContext() || |
| D.getContext() == Declarator::KNRTypeListContext)) { |
| S.Diag(DeclType.Loc, diag::err_array_static_outside_prototype) << |
| (ASM == ArrayType::Static ? "'static'" : "type qualifier"); |
| // Remove the 'static' and the type qualifiers. |
| if (ASM == ArrayType::Static) |
| ASM = ArrayType::Normal; |
| ATI.TypeQuals = 0; |
| D.setInvalidType(true); |
| } |
| |
| // C99 6.7.5.2p1: ... and then only in the outermost array type |
| // derivation. |
| 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() != Declarator::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().containsPlaceholderType() && |
| !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<ParenType>(T)) { |
| S.Diag(D.getDeclSpec().getTypeSpecTypeLoc(), |
| diag::err_trailing_return_in_parens) |
| << T << D.getDeclSpec().getSourceRange(); |
| D.setInvalidType(true); |
| } else if (D.getContext() != Declarator::LambdaExprContext && |
| (T.hasQualifiers() || !isa<AutoType>(T) || |
| cast<AutoType>(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 ((T->isArrayType() || T->isFunctionType()) && |
| (D.getName().getKind() != UnqualifiedId::IK_ConversionFunctionId)) { |
| unsigned diagID = diag::err_func_returning_array_function; |
| // Last processing chunk in block context means this function chunk |
| // represents the block. |
| if (chunkIndex == 0 && |
| D.getContext() == Declarator::BlockLiteralContext) |
| diagID = diag::err_block_returning_array_function; |
| S.Diag(DeclType.Loc, diagID) << T->isFunctionType() << T; |
| T = Context.IntTy; |
| D.setInvalidType(true); |
| } |
| |
| // Do not allow returning half FP value. |
| // FIXME: This really should be in BuildFunctionType. |
| if (T->isHalfType()) { |
| if (S.getLangOpts().OpenCL) { |
| if (!S.getOpenCLOptions().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<ObjCObjectPointerTypeLoc>(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<TagDecl>(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.CPlusPlus1z) |
| S.Diag(FTI.getExceptionSpecLocBeg(), |
| diag::err_exception_spec_in_typedef) |
| << (D.getContext() == Declarator::AliasDeclContext || |
| D.getContext() == Declarator::AliasTemplateContext); |
| |
| // If we see "T var();" or "T var(T());" at block scope, it is probably |
| // an attempt to initialize a variable, not a function declaration. |
| if (FTI.isAmbiguous) |
| warnAboutAmbiguousFunction(S, D, DeclType, T); |
| |
| FunctionType::ExtInfo EI(getCCForDeclaratorChunk(S, D, FTI, chunkIndex)); |
| |
| if (!FTI.NumParams && !FTI.isVariadic && !LangOpts.CPlusPlus) { |
| // 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<QualType, 16> ParamTys; |
| ParamTys.reserve(FTI.NumParams); |
| |
| SmallVector<FunctionProtoType::ExtParameterInfo, 16> |
| ExtParameterInfos(FTI.NumParams); |
| bool HasAnyInterestingExtParameterInfos = false; |
| |
| for (unsigned i = 0, e = FTI.NumParams; i != e; ++i) { |
| ParmVarDecl *Param = cast<ParmVarDecl>(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<BuiltinType>()) { |
| if (BTy->getKind() == BuiltinType::Float) { |
| ParamTy = Context.DoubleTy; |
| Param->setKNRPromoted(true); |
| } |
| } |
| } |
| |
| if (LangOpts.ObjCAutoRefCount && Param->hasAttr<NSConsumedAttr>()) { |
| ExtParameterInfos[i] = ExtParameterInfos[i].withIsConsumed(true); |
| HasAnyInterestingExtParameterInfos = true; |
| } |
| |
| if (auto attr = Param->getAttr<ParameterABIAttr>()) { |
| ExtParameterInfos[i] = |
| ExtParameterInfos[i].withABI(attr->getABI()); |
| 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<QualType, 4> Exceptions; |
| SmallVector<ParsedType, 2> DynamicExceptions; |
| SmallVector<SourceRange, 2> 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.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<CXXRecordDecl>(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<TemplateSpecializationType>(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<AttributeList *>(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) |
| 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<FunctionProtoType>(); |
| assert(FnTy && "Why oh why is there not a FunctionProtoType here?"); |
| |
| // C++ 8.3.5p4: |
| // A cv-qualifier-seq shall only be part of the function type |
| // for a nonstatic member function, the function type to which a pointer |
| // to member refers, or the top-level function type of a function typedef |
| // declaration. |
| // |
| // Core issue 547 also allows cv-qualifiers on function types that are |
| // top-level template type arguments. |
| bool FreeFunction; |
| if (!D.getCXXScopeSpec().isSet()) { |
| FreeFunction = ((D.getContext() != Declarator::MemberContext && |
| D.getContext() != Declarator::LambdaExprContext) || |
| D.getDeclSpec().isFriendSpecified()); |
| } else { |
| DeclContext *DC = S.computeDeclContext(D.getCXXScopeSpec()); |
| FreeFunction = (DC && !DC->isRecord()); |
| } |
| |
| // C++11 [dcl.fct]p6 (w/DR1417): |
| // An attempt to specify a function type with a cv-qualifier-seq or a |
| // ref-qualifier (including by typedef-name) is ill-formed unless it is: |
| // - the function type for a non-static member function, |
| // - the function type to which a pointer to member refers, |
| // - the top-level function type of a function typedef declaration or |
| // alias-declaration, |
| // - the type-id in the default argument of a type-parameter, or |
| // - the type-id of a template-argument for a type-parameter |
| // |
| // FIXME: Checking this here is insufficient. We accept-invalid on: |
| // |
| // template<typename T> struct S { void f(T); }; |
| // S<int() const> s; |
| // |
| // ... for instance. |
| if (IsQualifiedFunction && |
| !(!FreeFunction && |
| D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) && |
| !IsTypedefName && |
| D.getContext() != Declarator::TemplateTypeArgContext) { |
| SourceLocation Loc = D.getLocStart(); |
| SourceRange RemovalRange; |
| unsigned I; |
| if (D.isFunctionDeclarator(I)) { |
| SmallVector<SourceLocation, 4> 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<SourceLocation>(S.getSourceManager())); |
| RemovalRange = SourceRange(RemovalLocs.front(), RemovalLocs.back()); |
| Loc = RemovalLocs.front(); |
| } |
| } |
| |
| S.Diag(Loc, diag::err_invalid_qualified_function_type) |
| << FreeFunction << D.isFunctionDeclarator() << T |
| << getFunctionQualifiersAsString(FnTy) |
| << FixItHint::CreateRemoval(RemovalRange); |
| |
| // Strip the cv-qualifiers and ref-qualifiers from the type. |
| FunctionProtoType::ExtProtoInfo EPI = FnTy->getExtProtoInfo(); |
| EPI.TypeQuals = 0; |
| EPI.RefQualifier = RQ_None; |
| |
| T = Context.getFunctionType(FnTy->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 Declarator::PrototypeContext: |
| case Declarator::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 Declarator::TemplateParamContext: |
| // C++0x [temp.param]p15: |
| // If a template-parameter is a [...] is a parameter-declaration that |
| // declares a parameter pack (8.3.5), then the template-parameter is a |
| // template parameter pack (14.5.3). |
| // |
| // Note: core issue 778 clarifies that, if there are any unexpanded |
| // parameter packs in the type of the non-type template parameter, then |
| // it expands those parameter packs. |
| if (T->containsUnexpandedParameterPack()) |
| T = Context.getPackExpansionType(T, None); |
| else |
| S.Diag(D.getEllipsisLoc(), |
| LangOpts.CPlusPlus11 |
| ? diag::warn_cxx98_compat_variadic_templates |
| : diag::ext_variadic_templates); |
| break; |
| |
| case Declarator::FileContext: |
| case Declarator::KNRTypeListContext: |
| case Declarator::ObjCParameterContext: // FIXME: special diagnostic here? |
| case Declarator::ObjCResultContext: // FIXME: special diagnostic here? |
| case Declarator::TypeNameContext: |
| case Declarator::CXXNewContext: |
| case Declarator::AliasDeclContext: |
| case Declarator::AliasTemplateContext: |
| case Declarator::MemberContext: |
| case Declarator::BlockContext: |
| case Declarator::ForContext: |
| case Declarator::InitStmtContext: |
| case Declarator::ConditionContext: |
| case Declarator::CXXCatchContext: |
| case Declarator::ObjCCatchContext: |
| case Declarator::BlockLiteralContext: |
| case Declarator::LambdaExprContext: |
| case Declarator::ConversionIdContext: |
| case Declarator::TrailingReturnContext: |
| case Declarator::TemplateTypeArgContext: |
| // FIXME: We may want to allow parameter packs in block-literal contexts |
| // in the future. |
| S.Diag(D.getEllipsisLoc(), |
| diag::err_ellipsis_in_declarator_not_parameter); |
| D.setEllipsisLoc(SourceLocation()); |
| break; |
| } |
| } |
| |
| 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; |
| } |
| 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<TypeSpecLocFiller> { |
| 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<ElaboratedType>()) { |
| ElaboratedTypeLoc ElabTL = OldTL.castAs<ElaboratedTypeLoc>(); |
| TemplateSpecializationTypeLoc NamedTL = ElabTL.getNamedTypeLoc() |
| .castAs<TemplateSpecializationTypeLoc>(); |
| TL.copy(NamedTL); |
| } else { |
| TL.copy(OldTL.castAs<TemplateSpecializationTypeLoc>()); |
| assert(TL.getRAngleLoc() == OldTL.castAs<TemplateSpecializationTypeLoc>().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<ElaboratedTypeLoc>()); |
| 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<DependentNameTypeLoc>()); |
| } |
| void VisitDependentTemplateSpecializationTypeLoc( |
| DependentTemplateSpecializationTypeLoc TL) { |
| assert(DS.getTypeSpecType() == TST_typename); |
| TypeSourceInfo *TInfo = nullptr; |
| Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); |
| assert(TInfo); |
| TL.copy( |
| TInfo->getTypeLoc().castAs<DependentTemplateSpecializationTypeLoc>()); |
| } |
| 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<DeclaratorLocFiller> { |
| 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<DependentNameType>(ClsTy) && "Unexpected TypeLoc"); |
| { |
| DependentNameTypeLoc DNTLoc = ClsTL.castAs<DependentNameTypeLoc>(); |
| DNTLoc.setElaboratedKeywordLoc(SourceLocation()); |
| DNTLoc.setQualifierLoc(NNSLoc.getPrefix()); |
| DNTLoc.setNameLoc(NNSLoc.getLocalBeginLoc()); |
| } |
| break; |
| |
| case NestedNameSpecifier::TypeSpec: |
| case NestedNameSpecifier::TypeSpecWithTemplate: |
| if (isa<ElaboratedType>(ClsTy)) { |
| ElaboratedTypeLoc ETLoc = ClsTL.castAs<ElaboratedTypeLoc>(); |
| 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<Expr*>(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<ParmVarDecl>(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()); |
| } |
| |
| /// \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<PackExpansionType>(T)) { |
| CurrTL.castAs<PackExpansionTypeLoc>().setEllipsisLoc(D.getEllipsisLoc()); |
| CurrTL = CurrTL.getNextTypeLoc().getUnqualifiedLoc(); |
| } |
| |
| for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { |
| // An AtomicTypeLoc might be produced by an atomic qualifier in this |
| // declarator chunk. |
| if (AtomicTypeLoc ATL = CurrTL.getAs<AtomicTypeLoc>()) { |
| fillAtomicQualLoc(ATL, D.getTypeObject(i)); |
| CurrTL = ATL.getValueLoc().getUnqualifiedLoc(); |
| } |
| |
| while (AttributedTypeLoc TL = CurrTL.getAs<AttributedTypeLoc>()) { |
| fillAttributedTypeLoc(TL, D.getTypeObject(i).getAttrs(), DeclAttrs); |
| CurrTL = TL.getNextTypeLoc().getUnqualifiedLoc(); |
| } |
| |
| // FIXME: Ordering here? |
| while (AdjustedTypeLoc TL = CurrTL.getAs<AdjustedTypeLoc>()) |
| 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() != Declarator::ObjCParameterContext && |
| D.getContext() != Declarator::AliasDeclContext && |
| D.getContext() != Declarator::AliasTemplateContext) |
| checkUnusedDeclAttributes(D); |
| |
| if (getLangOpts().CPlusPlus) { |
| // Check that there are no default arguments (C++ only). |
| CheckExtraCXXDefaultArguments(D); |
| } |
| |
| return CreateParsedType(T, TInfo); |
| } |
| |
| ParsedType Sema::ActOnObjCInstanceType(SourceLocation Loc) { |
| QualType T = Context.getObjCInstanceType(); |
| TypeSourceInfo *TInfo = Context.getTrivialTypeSourceInfo(T, Loc); |
| return CreateParsedType(T, TInfo); |
| } |
| |
| //===----------------------------------------------------------------------===// |
| // Type Attribute Processing |
| //===----------------------------------------------------------------------===// |
| |
| /// HandleAddressSpaceTypeAttribute - Process an address_space attribute on the |
| /// specified type. The attribute contains 1 argument, the id of the address |
| /// space for the type. |
| static void HandleAddressSpaceTypeAttribute(QualType &Type, |
| const AttributeList &Attr, Sema &S){ |
| |
| // If this type is already address space qualified, reject it. |
| // ISO/IEC TR 18037 S5.3 (amending C99 6.7.3): "No type shall be qualified by |
| // qualifiers for two or more different address spaces." |
| if (Type.getAddressSpace()) { |
| S.Diag(Attr.getLoc(), diag::err_attribute_address_multiple_qualifiers); |
| Attr.setInvalid(); |
| return; |
| } |
| |
| // ISO/IEC TR 18037 S5.3 (amending C99 6.7.3): "A function type shall not be |
| // qualified by an address-space qualifier." |
| if (Type->isFunctionType()) { |
| S.Diag(Attr.getLoc(), diag::err_attribute_address_function_type); |
| Attr.setInvalid(); |
| return; |
| } |
| |
| unsigned 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 = static_cast<Expr *>(Attr.getArgAsExpr(0)); |
| llvm::APSInt addrSpace(32); |
| if (ASArgExpr->isTypeDependent() || ASArgExpr->isValueDependent() || |
| !ASArgExpr->isIntegerConstantExpr(addrSpace, S.Context)) { |
| S.Diag(Attr.getLoc(), diag::err_attribute_argument_type) |
| << Attr.getName() << AANT_ArgumentIntegerConstant |
| << ASArgExpr->getSourceRange(); |
| Attr.setInvalid(); |
| return; |
| } |
| |
| // Bounds checking. |
| if (addrSpace.isSigned()) { |
| if (addrSpace.isNegative()) { |
| S.Diag(Attr.getLoc(), diag::err_attribute_address_space_negative) |
| << ASArgExpr->getSourceRange(); |
| Attr.setInvalid(); |
| return; |
| } |
| addrSpace.setIsSigned(false); |
| } |
| llvm::APSInt max(addrSpace.getBitWidth()); |
| max = Qualifiers::MaxAddressSpace; |
| if (addrSpace > max) { |
| S.Diag(Attr.getLoc(), diag::err_attribute_address_space_too_high) |
| << int(Qualifiers::MaxAddressSpace) << ASArgExpr->getSourceRange(); |
| Attr.setInvalid(); |
| return; |
| } |
| ASIdx = static_cast<unsigned>(addrSpace.getZExtValue()); |
| } 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; |
| default: |
| assert(Attr.getKind() == AttributeList::AT_OpenCLPrivateAddressSpace); |
| ASIdx = 0; break; |
| } |
| } |
| |
| 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<AttributedType>(type)) { |
| if (attr->getAttrKind() == AttributedType::attr_objc_ownership) |
| return true; |
| |
| type = attr->getModifiedType(); |
| |
| // X *__strong (...) |
| } else if (const ParenType *paren = dyn_cast<ParenType>(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<PointerType>()) { |
| 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<ObjCObjectPointerType>()) { |
| 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<unsigned char /*WrapKind*/, 8> Stack; |
| |
| FunctionTypeUnwrapper(Sema &S, QualType T) : Original(T) { |
| while (true) { |
| const Type *Ty = T.getTypePtr(); |
| if (isa<FunctionType>(Ty)) { |
| Fn = cast<FunctionType>(Ty); |
| return; |
| } else if (isa<ParenType>(Ty)) { |
| T = cast<ParenType>(Ty)->getInnerType(); |
| Stack.push_back(Parens); |
| } else if (isa<PointerType>(Ty)) { |
| T = cast<PointerType>(Ty)->getPointeeType(); |
| Stack.push_back(Pointer); |
| } else if (isa<BlockPointerType>(Ty)) { |
| T = cast<BlockPointerType>(Ty)->getPointeeType(); |
| Stack.push_back(BlockPointer); |
| } else if (isa<MemberPointerType>(Ty)) { |
| T = cast<MemberPointerType>(Ty)->getPointeeType(); |
| Stack.push_back(MemberPointer); |
| } else if (isa<ReferenceType>(Ty)) { |
| T = cast<ReferenceType>(Ty)->getPointeeType(); |
| Stack.push_back(Reference); |
| } else if (isa<AttributedType>(Ty)) { |
| T = cast<AttributedType>(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<WrapKind>(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<AttributedType>(Old)->getEquivalentType(), I); |
| |
| case Parens: { |
| QualType New = wrap(C, cast<ParenType>(Old)->getInnerType(), I); |
| return C.getParenType(New); |
| } |
| |
| case Pointer: { |
| QualType New = wrap(C, cast<PointerType>(Old)->getPointeeType(), I); |
| return C.getPointerType(New); |
| } |
| |
| case BlockPointer: { |
| QualType New = wrap(C, cast<BlockPointerType>(Old)->getPointeeType(),I); |
| return C.getBlockPointerType(New); |
| } |
| |
| case MemberPointer: { |
| const MemberPointerType *OldMPT = cast<MemberPointerType>(Old); |
| QualType New = wrap(C, OldMPT->getPointeeType(), I); |
| return C.getMemberPointerType(New, OldMPT->getClass()); |
| } |
| |
| case Reference: { |
| const ReferenceType *OldRef = cast<ReferenceType>(Old); |
| QualType New = wrap(C, OldRef->getPointeeType(), I); |
| if (isa<LValueReferenceType>(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<AttributedType>(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<AttributedType>(Desugared); |
| } |
| |
| // Pointer type qualifiers can only operate on pointer types, but not |
| // pointer-to-member types. |
| if (!isa<PointerType>(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; |
| } |
| |
| /// Rebuild an attributed type without the nullability attribute on it. |
| static QualType rebuildAttributedTypeWithoutNullability(ASTContext &ctx, |
| QualType type) { |
| auto attributed = dyn_cast<AttributedType>(type.getTypePtr()); |
| if (!attributed) return type; |
| |
| // Skip the nullability attribute; we're done. |
| if (attributed->getImmediateNullability()) { |
| return attributed->getModifiedType(); |
| } |
| |
| // Build the modified type. |
| auto modified = rebuildAttributedTypeWithoutNullability( |
| ctx, attributed->getModifiedType()); |
| assert(modified.getTypePtr() != attributed->getModifiedType().getTypePtr()); |
| return ctx.getAttributedType(attributed->getAttrKind(), modified, |
| attributed->getEquivalentType()); |
| } |
| |
| bool Sema::checkNullabilityTypeSpecifier(QualType &type, |
| NullabilityKind nullability, |
| SourceLocation nullabilityLoc, |
| bool isContextSensitive, |
| bool allowOnArrayType, |
| bool implicit, |
| bool overrideExisting) { |
| if (!implicit) |
| recordNullabilitySeen(*this, nullabilityLoc); |
| |
| // Check for existing nullability attributes on the type. |
| QualType desugared = type; |
| while (auto attributed = dyn_cast<AttributedType>(desugared.getTypePtr())) { |
| // Check whether there is already a null |
| if (auto existingNullability = attributed->getImmediateNullability()) { |
| // Duplicated nullability. |
| if (nullability == *existingNullability) { |
| if (implicit) |
| break; |
| |
| Diag(nullabilityLoc, diag::warn_nullability_duplicate) |
| << DiagNullabilityKind(nullability, isContextSensitive) |
| << FixItHint::CreateRemoval(nullabilityLoc); |
| |
| break; |
| } |
| |
| if (!overrideExisting) { |
| // Conflicting nullability. |
| Diag(nullabilityLoc, diag::err_nullability_conflicting) |
| << DiagNullabilityKind(nullability, isContextSensitive) |
| << DiagNullabilityKind(*existingNullability, false); |
| return true; |
| } |
| |
| // Rebuild the attributed type, dropping the existing nullability. |
| type = rebuildAttributedTypeWithoutNullability(Context, type); |
| } |
| |
| 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 && !implicit) { |
| 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<TypedefType>()) { |
| 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())) { |
| if (!implicit) { |
| 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) { |
| 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) { |
| // Find out if it's an Objective-C object or object pointer type; |
| const ObjCObjectPointerType *ptrType = type->getAs<ObjCObjectPointerType>(); |
| const ObjCObjectType *objType = ptrType ? ptrType->getObjectType() |
| : type->getAs<ObjCObjectType>(); |
| |
| // 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<unsigned>(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<StringLiteral>(Attr.getArgAsExpr(0))->getString(); |
| else |
| Str = Attr.getArgAsIdent(0)->Ident->getName(); |
| return llvm::StringSwitch<AttributedType::Kind>(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) { |
| assert(S.getLangOpts().ObjCAutoRefCount && |
| "ns_returns_retained treated as type attribute in non-ARC"); |
| if (attr.getNumArgs()) return true; |
| |
| // Delay if this is not a function type. |
| if (!unwrapped.isFunctionType()) |
| return false; |
| |
| FunctionType::ExtInfo EI |
| = unwrapped.get()->getExtInfo().withProducesResult(true); |
| type = unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI)); |
| return true; |
| } |
| |
| if (attr.getKind() == AttributeList::AT_Regparm) { |
| unsigned value; |
| if (S.CheckRegparmAttr(attr, value)) |
| return true; |
| |
| // Delay if this is not a function type. |
| if (!unwrapped.isFunctionType()) |
| return false; |
| |
| // Diagnose regparm with fastcall. |
| const FunctionType *fn = unwrapped.get(); |
| CallingConv CC = fn->getCallConv(); |
| if (CC == CC_X86FastCall) { |
| S.Diag(attr.getLoc(), diag::err_attributes_are_not_compatible) |
| << FunctionType::getNameForCallConv(CC) |
| << "regparm"; |
| attr.setInvalid(); |
| return true; |
| } |
| |
| FunctionType::ExtInfo EI = |
| unwrapped.get()->getExtInfo().withRegParm(value); |
| type = unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI)); |
| return true; |
| } |
| |
| // Delay if the type didn't work out to a function. |
| if (!unwrapped.isFunctionType()) return false; |
| |
| // Otherwise, a calling convention. |
| CallingConv CC; |
| if (S.CheckCallingConvAttr(attr, CC)) |
| return true; |
| |
| const FunctionType *fn = unwrapped.get(); |
| CallingConv CCOld = fn->getCallConv(); |
| 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<FunctionProtoType>(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<AttributedType>(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<FunctionProtoType>(FT) && |
| cast<FunctionProtoType>(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<Expr *>(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<unsigned>(S.Context.getTypeSize(CurType)); |
| // vecSize is specified in bytes - convert to bits. |
| unsigned vectorSize = static_cast<unsigned>(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<BuiltinType>(); |
| 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<Expr *>(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<unsigned>(S.Context.getTypeSize(CurType)); |
| unsigned numElts = static_cast<unsigned>(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<TypedefType>()) { |
| QualType PointeeTy = TypedefTy->desugar(); |
| S.Diag(Attr.getLoc(), diag::err_opencl_multiple_access_qualifiers); |
| |
| std::string PrevAccessQual; |
| switch (cast<BuiltinType>(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<PipeType>()->getElementType(); |
| CurType = S.Context.getWritePipeType(ElemType); |
| } |
| } |
| } |
| |
| 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. |
| |
| bool hasOpenCLAddressSpace = false; |
| 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(); |
| hasOpenCLAddressSpace = true; |
| 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, /*implicit=*/false)) { |
| 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; |
| |
| case AttributeList::AT_NSReturnsRetained: |
| if (!state.getSema().getLangOpts().ObjCAutoRefCount) |
| break; |
| // fallthrough into the function attrs |
| |
| FUNCTION_TYPE_ATTRS_CASELIST: |
| attr.setUsedAsTypeAttr(); |
| |
| // Never process function type attributes as part of the |
| // declaration-specifiers. |
| if (TAL == TAL_DeclSpec) |
| distributeFunctionTypeAttrFromDeclSpec(state, attr, type); |
| |
| // Otherwise, handle the possible delays. |
| else if (!handleFunctionTypeAttr(state, attr, type)) |
| distributeFunctionTypeAttr(state, attr, type); |
| break; |
| } |
| } |
| |
| // 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 (state.getSema().getLangOpts().OpenCLVersion >= 200 && |
| !hasOpenCLAddressSpace && type.getAddressSpace() == 0 && |
| (TAL == TAL_DeclSpec || TAL == TAL_DeclChunk)) { |
| Declarator &D = state.getDeclarator(); |
| if (state.getCurrentChunkIndex() > 0 && |
| D.getTypeObject(state.getCurrentChunkIndex() - 1).Kind == |
| DeclaratorChunk::Pointer) { |
| type = state.getSema().Context.getAddrSpaceQualType( |
| type, LangAS::opencl_generic); |
| } else if (state.getCurrentChunkIndex() == 0 && |
| D.getContext() == Declarator::FileContext && |
| !D.isFunctionDeclarator() && !D.isFunctionDefinition() && |
| D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && |
| !type->isSamplerT()) |
| type = state.getSema().Context.getAddrSpaceQualType( |
| type, LangAS::opencl_global); |
| else if (state.getCurrentChunkIndex() == 0 && |
| D.getContext() == Declarator::BlockContext && |
| D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_static) |
| type = state.getSema().Context.getAddrSpaceQualType( |
| type, LangAS::opencl_global); |
| } |
| } |
| |
| void Sema::completeExprArrayBound(Expr *E) { |
| if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E->IgnoreParens())) { |
| if (VarDecl *Var = dyn_cast<VarDecl>(DRE->getDecl())) { |
| if (isTemplateInstantiation(Var->getTemplateSpecializationKind())) { |
| SourceLocation PointOfInstantiation = E->getExprLoc(); |
| |
| if (MemberSpecializationInfo *MSInfo = |
| Var->getMemberSpecializationInfo()) { |
| // If we don't already have a point of instantiation, this is it. |
| if (MSInfo->getPointOfInstantiation().isInvalid()) { |
| MSInfo->setPointOfInstantiation(PointOfInstantiation); |
| |
| // This is a modification of an existing AST node. Notify |
| // listeners. |
| if (ASTMutationListener *L = getASTMutationListener()) |
| L->StaticDataMemberInstantiated(Var); |
| } |
| } else { |
| VarTemplateSpecializationDecl *VarSpec = |
| cast<VarTemplateSpecializationDecl>(Var); |
| if (VarSpec->getPointOfInstantiation().isInvalid()) |
| VarSpec->setPointOfInstantiation(PointOfInstantiation); |
| } |
| |
| InstantiateVariableDefinition(PointOfInstantiation, Var); |
| |
| // Update the type to the newly instantiated definition's type both |
| // here and within the expression. |
| if (VarDecl *Def = Var->getDefinition()) { |
| DRE->setDecl(Def); |
| 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<TagType>()) { |
| if (!Tag->getDecl()->isCompleteDefinitionRequired()) { |
| Tag->getDecl()->setCompleteDefinitionRequired(); |
| Consumer.HandleTagDeclRequiredDefinition(Tag->getDecl()); |
| } |
| } |
| return false; |
| } |
| |
| /// \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<TagDecl>(D) && cast<TagDecl>(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<CXXRecordDecl>(D)) { |
| if (auto *Pattern = RD->getTemplateInstantiationPattern()) |
| RD = Pattern; |
| D = RD->getDefinition(); |
| } else if (auto *ED = dyn_cast<EnumDecl>(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<FunctionDecl>(D)) { |
| if (auto *Pattern = FD->getTemplateInstantiationPattern()) |
| FD = Pattern; |
| D = FD->getDefinition(); |
| } else if (auto *VD = dyn_cast<VarDecl>(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>()) { |
| 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<MemberPointerType>()) { |
| 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<EnumDecl>(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<TagType>(); |
| const ObjCInterfaceType *IFace = T->getAs<ObjCInterfaceType>(); |
| |
| // 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<NamedDecl *>(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) |
| Source->CompleteType(Tag->getDecl()); |
| else |
| 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<RecordType>()) { |
| bool Instantiated = false; |
| bool Diagnosed = false; |
| if (ClassTemplateSpecializationDecl *ClassTemplateSpec |
| = dyn_cast<ClassTemplateSpecializationDecl>(Record->getDecl())) { |
| if (ClassTemplateSpec->getSpecializationKind() == TSK_Undeclared) { |
| Diagnosed = InstantiateClassTemplateSpecialization( |
| Loc, ClassTemplateSpec, TSK_ImplicitInstantiation, |
| /*Complain=*/Diagnoser); |
| Instantiated = true; |
| } |
| } else if (CXXRecordDecl *Rec |
| = dyn_cast<CXXRecordDecl>(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<RecordType>(); |
| if (!RT) |
| return true; |
| |
| const CXXRecordDecl *RD = cast<CXXRecordDecl>(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<TagType>()) |
| 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<DeclRefExpr>(E)) { |
| if (const ValueDecl *VD = dyn_cast<ValueDecl>(DRE->getDecl())) |
| return VD->getType(); |
| } else if (const MemberExpr *ME = dyn_cast<MemberExpr>(E)) { |
| if (const FieldDecl *FD = dyn_cast<FieldDecl>(ME->getMemberDecl())) |
| return FD->getType(); |
| } else if (const ObjCIvarRefExpr *IR = dyn_cast<ObjCIvarRefExpr>(E)) { |
| return IR->getDecl()->getType(); |
| } else if (const ObjCPropertyRefExpr *PR = dyn_cast<ObjCPropertyRefExpr>(E)) { |
| if (PR->isExplicitProperty()) |
| return PR->getExplicitProperty()->getType(); |
| } else if (auto *PE = dyn_cast<PredefinedExpr>(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<ParenExpr>(E)) { |
| if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E->IgnoreParens())) { |
| if (VarDecl *Var = dyn_cast<VarDecl>(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 && ActiveTemplateInstantiations.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<EnumType>()->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); |
| } |