| //===--- 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 "Sema.h" |
| #include "clang/AST/ASTContext.h" |
| #include "clang/AST/DeclObjC.h" |
| #include "clang/AST/Expr.h" |
| #include "clang/Basic/Diagnostic.h" |
| #include "clang/Parse/DeclSpec.h" |
| using namespace clang; |
| |
| /// ConvertDeclSpecToType - Convert the specified declspec to the appropriate |
| /// type object. This returns null on error. |
| QualType Sema::ConvertDeclSpecToType(const DeclSpec &DS) { |
| // FIXME: Should move the logic from DeclSpec::Finish to here for validity |
| // checking. |
| QualType Result; |
| |
| switch (DS.getTypeSpecType()) { |
| default: assert(0 && "Unknown TypeSpecType!"); |
| 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) { |
| Diag(DS.getTypeSpecSignLoc(), diag::ext_invalid_sign_spec, |
| DS.getSpecifierName(DS.getTypeSpecType())); |
| Result = Context.getSignedWCharType(); |
| } else { |
| assert(DS.getTypeSpecSign() == DeclSpec::TSS_unsigned && |
| "Unknown TSS value"); |
| Diag(DS.getTypeSpecSignLoc(), diag::ext_invalid_sign_spec, |
| DS.getSpecifierName(DS.getTypeSpecType())); |
| Result = Context.getUnsignedWCharType(); |
| } |
| break; |
| case DeclSpec::TST_unspecified: |
| // "<proto1,proto2>" is an objc qualified ID with a missing id. |
| if (DeclSpec::ProtocolQualifierListTy PQ = DS.getProtocolQualifiers()) { |
| Result = Context.getObjCQualifiedIdType((ObjCProtocolDecl**)PQ, |
| DS.getNumProtocolQualifiers()); |
| 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 (getLangOptions().ImplicitInt) { |
| if ((DS.getParsedSpecifiers() & (DeclSpec::PQ_StorageClassSpecifier | |
| DeclSpec::PQ_TypeSpecifier | |
| DeclSpec::PQ_TypeQualifier)) == 0) |
| Diag(DS.getSourceRange().getBegin(), diag::ext_missing_declspec); |
| } else { |
| // 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 (!DS.hasTypeSpecifier()) |
| Diag(DS.getSourceRange().getBegin(), diag::ext_missing_type_specifier); |
| } |
| |
| // 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; 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; break; |
| } |
| } |
| 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_bool: Result = Context.BoolTy; break; // _Bool or bool |
| case DeclSpec::TST_decimal32: // _Decimal32 |
| case DeclSpec::TST_decimal64: // _Decimal64 |
| case DeclSpec::TST_decimal128: // _Decimal128 |
| assert(0 && "FIXME: GNU decimal extensions not supported yet!"); |
| case DeclSpec::TST_class: |
| case DeclSpec::TST_enum: |
| case DeclSpec::TST_union: |
| case DeclSpec::TST_struct: { |
| Decl *D = static_cast<Decl *>(DS.getTypeRep()); |
| assert(D && "Didn't get a decl for a class/enum/union/struct?"); |
| assert(DS.getTypeSpecWidth() == 0 && DS.getTypeSpecComplex() == 0 && |
| DS.getTypeSpecSign() == 0 && |
| "Can't handle qualifiers on typedef names yet!"); |
| // TypeQuals handled by caller. |
| Result = Context.getTypeDeclType(cast<TypeDecl>(D)); |
| break; |
| } |
| case DeclSpec::TST_typedef: { |
| Decl *D = static_cast<Decl *>(DS.getTypeRep()); |
| assert(D && "Didn't get a decl for a typedef?"); |
| assert(DS.getTypeSpecWidth() == 0 && DS.getTypeSpecComplex() == 0 && |
| DS.getTypeSpecSign() == 0 && |
| "Can't handle qualifiers on typedef names yet!"); |
| DeclSpec::ProtocolQualifierListTy PQ = DS.getProtocolQualifiers(); |
| |
| // FIXME: Adding a TST_objcInterface clause doesn't seem ideal, so |
| // we have this "hack" for now... |
| if (ObjCInterfaceDecl *ObjCIntDecl = dyn_cast<ObjCInterfaceDecl>(D)) { |
| if (PQ == 0) { |
| Result = Context.getObjCInterfaceType(ObjCIntDecl); |
| break; |
| } |
| |
| Result = Context.getObjCQualifiedInterfaceType(ObjCIntDecl, |
| (ObjCProtocolDecl**)PQ, |
| DS.getNumProtocolQualifiers()); |
| break; |
| } else if (TypedefDecl *typeDecl = dyn_cast<TypedefDecl>(D)) { |
| if (Context.getObjCIdType() == Context.getTypedefType(typeDecl) && PQ) { |
| // id<protocol-list> |
| Result = Context.getObjCQualifiedIdType((ObjCProtocolDecl**)PQ, |
| DS.getNumProtocolQualifiers()); |
| break; |
| } |
| } |
| // TypeQuals handled by caller. |
| Result = Context.getTypeDeclType(dyn_cast<TypeDecl>(D)); |
| break; |
| } |
| case DeclSpec::TST_typeofType: |
| Result = QualType::getFromOpaquePtr(DS.getTypeRep()); |
| assert(!Result.isNull() && "Didn't get a type for typeof?"); |
| // TypeQuals handled by caller. |
| Result = Context.getTypeOfType(Result); |
| break; |
| case DeclSpec::TST_typeofExpr: { |
| Expr *E = static_cast<Expr *>(DS.getTypeRep()); |
| assert(E && "Didn't get an expression for typeof?"); |
| // TypeQuals handled by caller. |
| Result = Context.getTypeOfExpr(E); |
| break; |
| } |
| } |
| |
| // Handle complex types. |
| if (DS.getTypeSpecComplex() == DeclSpec::TSC_complex) |
| Result = Context.getComplexType(Result); |
| |
| assert(DS.getTypeSpecComplex() != DeclSpec::TSC_imaginary && |
| "FIXME: imaginary types not supported yet!"); |
| |
| // See if there are any attributes on the declspec that apply to the type (as |
| // opposed to the decl). |
| if (const AttributeList *AL = DS.getAttributes()) |
| ProcessTypeAttributeList(Result, AL); |
| |
| // Apply const/volatile/restrict qualifiers to T. |
| if (unsigned TypeQuals = DS.getTypeQualifiers()) { |
| |
| // Enforce C99 6.7.3p2: "Types other than pointer types derived from object |
| // or incomplete types shall not be restrict-qualified." C++ also allows |
| // restrict-qualified references. |
| if (TypeQuals & QualType::Restrict) { |
| if (const PointerLikeType *PT = Result->getAsPointerLikeType()) { |
| QualType EltTy = PT->getPointeeType(); |
| |
| // If we have a pointer or reference, the pointee must have an object or |
| // incomplete type. |
| if (!EltTy->isIncompleteOrObjectType()) { |
| Diag(DS.getRestrictSpecLoc(), |
| diag::err_typecheck_invalid_restrict_invalid_pointee, |
| EltTy.getAsString(), DS.getSourceRange()); |
| TypeQuals &= ~QualType::Restrict; // Remove the restrict qualifier. |
| } |
| } else { |
| Diag(DS.getRestrictSpecLoc(), |
| diag::err_typecheck_invalid_restrict_not_pointer, |
| Result.getAsString(), DS.getSourceRange()); |
| TypeQuals &= ~QualType::Restrict; // Remove the restrict qualifier. |
| } |
| } |
| |
| // Warn about CV qualifiers on functions: C99 6.7.3p8: "If the specification |
| // of a function type includes any type qualifiers, the behavior is |
| // undefined." |
| if (Result->isFunctionType() && TypeQuals) { |
| // Get some location to point at, either the C or V location. |
| SourceLocation Loc; |
| if (TypeQuals & QualType::Const) |
| Loc = DS.getConstSpecLoc(); |
| else { |
| assert((TypeQuals & QualType::Volatile) && |
| "Has CV quals but not C or V?"); |
| Loc = DS.getVolatileSpecLoc(); |
| } |
| Diag(Loc, diag::warn_typecheck_function_qualifiers, |
| Result.getAsString(), DS.getSourceRange()); |
| } |
| |
| Result = Result.getQualifiedType(TypeQuals); |
| } |
| return Result; |
| } |
| |
| /// GetTypeForDeclarator - Convert the type for the specified declarator to Type |
| /// instances. |
| QualType Sema::GetTypeForDeclarator(Declarator &D, Scope *S) { |
| // long long is a C99 feature. |
| if (!getLangOptions().C99 && !getLangOptions().CPlusPlus0x && |
| D.getDeclSpec().getTypeSpecWidth() == DeclSpec::TSW_longlong) |
| Diag(D.getDeclSpec().getTypeSpecWidthLoc(), diag::ext_longlong); |
| |
| QualType T = ConvertDeclSpecToType(D.getDeclSpec()); |
| |
| // 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) { |
| DeclaratorChunk &DeclType = D.getTypeObject(e-i-1); |
| switch (DeclType.Kind) { |
| default: assert(0 && "Unknown decltype!"); |
| case DeclaratorChunk::BlockPointer: |
| if (DeclType.Cls.TypeQuals) |
| Diag(D.getIdentifierLoc(), diag::err_qualified_block_pointer_type); |
| if (!T.getTypePtr()->isFunctionType()) |
| Diag(D.getIdentifierLoc(), diag::err_nonfunction_block_type); |
| else |
| T = Context.getBlockPointerType(T); |
| break; |
| case DeclaratorChunk::Pointer: |
| if (T->isReferenceType()) { |
| // C++ 8.3.2p4: There shall be no ... pointers to references ... |
| Diag(DeclType.Loc, diag::err_illegal_decl_pointer_to_reference, |
| D.getIdentifier() ? D.getIdentifier()->getName() : "type name"); |
| D.setInvalidType(true); |
| T = Context.IntTy; |
| } |
| |
| // Enforce C99 6.7.3p2: "Types other than pointer types derived from |
| // object or incomplete types shall not be restrict-qualified." |
| if ((DeclType.Ptr.TypeQuals & QualType::Restrict) && |
| !T->isIncompleteOrObjectType()) { |
| Diag(DeclType.Loc, |
| diag::err_typecheck_invalid_restrict_invalid_pointee, |
| T.getAsString()); |
| DeclType.Ptr.TypeQuals &= QualType::Restrict; |
| } |
| |
| // Apply the pointer typequals to the pointer object. |
| T = Context.getPointerType(T).getQualifiedType(DeclType.Ptr.TypeQuals); |
| break; |
| case DeclaratorChunk::Reference: |
| if (const ReferenceType *RT = T->getAsReferenceType()) { |
| // C++ 8.3.2p4: There shall be no references to references. |
| Diag(DeclType.Loc, diag::err_illegal_decl_reference_to_reference, |
| D.getIdentifier() ? D.getIdentifier()->getName() : "type name"); |
| D.setInvalidType(true); |
| T = RT->getPointeeType(); |
| } |
| |
| // Enforce C99 6.7.3p2: "Types other than pointer types derived from |
| // object or incomplete types shall not be restrict-qualified." |
| if (DeclType.Ref.HasRestrict && |
| !T->isIncompleteOrObjectType()) { |
| Diag(DeclType.Loc, |
| diag::err_typecheck_invalid_restrict_invalid_pointee, |
| T.getAsString()); |
| DeclType.Ref.HasRestrict = false; |
| } |
| |
| T = Context.getReferenceType(T); |
| |
| // Handle restrict on references. |
| if (DeclType.Ref.HasRestrict) |
| T.addRestrict(); |
| break; |
| case DeclaratorChunk::Array: { |
| 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; |
| |
| // 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 (T->isIncompleteType()) { |
| Diag(D.getIdentifierLoc(), diag::err_illegal_decl_array_incomplete_type, |
| T.getAsString()); |
| T = Context.IntTy; |
| D.setInvalidType(true); |
| } else if (T->isFunctionType()) { |
| Diag(D.getIdentifierLoc(), diag::err_illegal_decl_array_of_functions, |
| D.getIdentifier() ? D.getIdentifier()->getName() : "type name"); |
| T = Context.getPointerType(T); |
| D.setInvalidType(true); |
| } else if (const ReferenceType *RT = T->getAsReferenceType()) { |
| // C++ 8.3.2p4: There shall be no ... arrays of references ... |
| Diag(D.getIdentifierLoc(), diag::err_illegal_decl_array_of_references, |
| D.getIdentifier() ? D.getIdentifier()->getName() : "type name"); |
| T = RT->getPointeeType(); |
| D.setInvalidType(true); |
| } else if (const RecordType *EltTy = T->getAsRecordType()) { |
| // If the element type is a struct or union that contains a variadic |
| // array, reject it: C99 6.7.2.1p2. |
| if (EltTy->getDecl()->hasFlexibleArrayMember()) { |
| Diag(DeclType.Loc, diag::err_flexible_array_in_array, |
| T.getAsString()); |
| T = Context.IntTy; |
| D.setInvalidType(true); |
| } |
| } else if (T->isObjCInterfaceType()) { |
| Diag(DeclType.Loc, diag::warn_objc_array_of_interfaces, |
| T.getAsString()); |
| } |
| |
| // C99 6.7.5.2p1: The size expression shall have integer type. |
| if (ArraySize && !ArraySize->getType()->isIntegerType()) { |
| Diag(ArraySize->getLocStart(), diag::err_array_size_non_int, |
| ArraySize->getType().getAsString(), ArraySize->getSourceRange()); |
| D.setInvalidType(true); |
| delete ArraySize; |
| ATI.NumElts = ArraySize = 0; |
| } |
| llvm::APSInt ConstVal(32); |
| if (!ArraySize) { |
| T = Context.getIncompleteArrayType(T, ASM, ATI.TypeQuals); |
| } else if (!ArraySize->isIntegerConstantExpr(ConstVal, Context) || |
| !T->isConstantSizeType()) { |
| // Per C99, a variable array is an array with either a non-constant |
| // size or an element type that has a non-constant-size |
| T = Context.getVariableArrayType(T, ArraySize, ASM, ATI.TypeQuals); |
| } else { |
| // C99 6.7.5.2p1: If the expression is a constant expression, it shall |
| // have a value greater than zero. |
| if (ConstVal.isSigned()) { |
| if (ConstVal.isNegative()) { |
| Diag(ArraySize->getLocStart(), |
| diag::err_typecheck_negative_array_size, |
| ArraySize->getSourceRange()); |
| D.setInvalidType(true); |
| } else if (ConstVal == 0) { |
| // GCC accepts zero sized static arrays. |
| Diag(ArraySize->getLocStart(), diag::ext_typecheck_zero_array_size, |
| ArraySize->getSourceRange()); |
| } |
| } |
| T = Context.getConstantArrayType(T, ConstVal, ASM, ATI.TypeQuals); |
| } |
| // If this is not C99, extwarn about VLA's and C99 array size modifiers. |
| if (!getLangOptions().C99 && |
| (ASM != ArrayType::Normal || |
| (ArraySize && !ArraySize->isIntegerConstantExpr(Context)))) |
| Diag(D.getIdentifierLoc(), diag::ext_vla); |
| 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; |
| |
| // C99 6.7.5.3p1: The return type may not be a function or array type. |
| if (T->isArrayType() || T->isFunctionType()) { |
| Diag(DeclType.Loc, diag::err_func_returning_array_function, |
| T.getAsString()); |
| T = Context.IntTy; |
| D.setInvalidType(true); |
| } |
| |
| if (FTI.NumArgs == 0) { |
| if (getLangOptions().CPlusPlus) { |
| // C++ 8.3.5p2: If the parameter-declaration-clause is empty, the |
| // function takes no arguments. |
| T = Context.getFunctionType(T, NULL, 0, FTI.isVariadic); |
| } else { |
| // Simple void foo(), where the incoming T is the result type. |
| T = Context.getFunctionTypeNoProto(T); |
| } |
| } else if (FTI.ArgInfo[0].Param == 0) { |
| // C99 6.7.5.3p3: Reject int(x,y,z) when it's not a function definition. |
| Diag(FTI.ArgInfo[0].IdentLoc, diag::err_ident_list_in_fn_declaration); |
| } else { |
| // Otherwise, we have a function with an argument list that is |
| // potentially variadic. |
| llvm::SmallVector<QualType, 16> ArgTys; |
| |
| for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { |
| ParmVarDecl *Param = (ParmVarDecl *)FTI.ArgInfo[i].Param; |
| QualType ArgTy = Param->getType(); |
| assert(!ArgTy.isNull() && "Couldn't parse type?"); |
| // |
| // Perform the default function/array conversion (C99 6.7.5.3p[7,8]). |
| // This matches the conversion that is done in |
| // Sema::ActOnParamDeclarator(). Without this conversion, the |
| // argument type in the function prototype *will not* match the |
| // type in ParmVarDecl (which makes the code generator unhappy). |
| // |
| // FIXME: We still apparently need the conversion in |
| // Sema::ActOnParamDeclarator(). This doesn't make any sense, since |
| // it should be driving off the type being created here. |
| // |
| // FIXME: If a source translation tool needs to see the original type, |
| // then we need to consider storing both types somewhere... |
| // |
| if (ArgTy->isArrayType()) { |
| ArgTy = Context.getArrayDecayedType(ArgTy); |
| } else if (ArgTy->isFunctionType()) |
| ArgTy = Context.getPointerType(ArgTy); |
| |
| // Look for 'void'. void is allowed only as a single argument to a |
| // function with no other parameters (C99 6.7.5.3p10). We record |
| // int(void) as a FunctionTypeProto with an empty argument list. |
| else if (ArgTy->isVoidType()) { |
| // If this is something like 'float(int, void)', reject it. 'void' |
| // is an incomplete type (C99 6.2.5p19) and function decls cannot |
| // have arguments of incomplete type. |
| if (FTI.NumArgs != 1 || FTI.isVariadic) { |
| Diag(DeclType.Loc, diag::err_void_only_param); |
| ArgTy = Context.IntTy; |
| Param->setType(ArgTy); |
| } else if (FTI.ArgInfo[i].Ident) { |
| // Reject, but continue to parse 'int(void abc)'. |
| Diag(FTI.ArgInfo[i].IdentLoc, |
| diag::err_param_with_void_type); |
| ArgTy = Context.IntTy; |
| Param->setType(ArgTy); |
| } else { |
| // Reject, but continue to parse 'float(const void)'. |
| if (ArgTy.getCVRQualifiers()) |
| Diag(DeclType.Loc, diag::err_void_param_qualified); |
| |
| // Do not add 'void' to the ArgTys list. |
| break; |
| } |
| } else if (!FTI.hasPrototype) { |
| if (ArgTy->isPromotableIntegerType()) { |
| ArgTy = Context.IntTy; |
| } else if (const BuiltinType* BTy = ArgTy->getAsBuiltinType()) { |
| if (BTy->getKind() == BuiltinType::Float) |
| ArgTy = Context.DoubleTy; |
| } |
| } |
| |
| ArgTys.push_back(ArgTy); |
| } |
| T = Context.getFunctionType(T, &ArgTys[0], ArgTys.size(), |
| FTI.isVariadic); |
| } |
| break; |
| } |
| |
| // See if there are any attributes on this declarator chunk. |
| if (const AttributeList *AL = DeclType.getAttrs()) |
| ProcessTypeAttributeList(T, AL); |
| } |
| |
| // If there were any type attributes applied to the decl itself (not the |
| // type, apply the type attribute to the type!) |
| if (const AttributeList *Attrs = D.getAttributes()) |
| ProcessTypeAttributeList(T, Attrs); |
| |
| return T; |
| } |
| |
| /// ObjCGetTypeForMethodDefinition - Builds the type for a method definition |
| /// declarator |
| QualType Sema::ObjCGetTypeForMethodDefinition(DeclTy *D) { |
| ObjCMethodDecl *MDecl = dyn_cast<ObjCMethodDecl>(static_cast<Decl *>(D)); |
| QualType T = MDecl->getResultType(); |
| llvm::SmallVector<QualType, 16> ArgTys; |
| |
| // Add the first two invisible argument types for self and _cmd. |
| if (MDecl->isInstance()) { |
| QualType selfTy = Context.getObjCInterfaceType(MDecl->getClassInterface()); |
| selfTy = Context.getPointerType(selfTy); |
| ArgTys.push_back(selfTy); |
| } |
| else |
| ArgTys.push_back(Context.getObjCIdType()); |
| ArgTys.push_back(Context.getObjCSelType()); |
| |
| for (int i = 0, e = MDecl->getNumParams(); i != e; ++i) { |
| ParmVarDecl *PDecl = MDecl->getParamDecl(i); |
| QualType ArgTy = PDecl->getType(); |
| assert(!ArgTy.isNull() && "Couldn't parse type?"); |
| // Perform the default function/array conversion (C99 6.7.5.3p[7,8]). |
| // This matches the conversion that is done in |
| // Sema::ActOnParamDeclarator(). |
| if (ArgTy->isArrayType()) |
| ArgTy = Context.getArrayDecayedType(ArgTy); |
| else if (ArgTy->isFunctionType()) |
| ArgTy = Context.getPointerType(ArgTy); |
| ArgTys.push_back(ArgTy); |
| } |
| T = Context.getFunctionType(T, &ArgTys[0], ArgTys.size(), |
| MDecl->isVariadic()); |
| return T; |
| } |
| |
| /// UnwrapSimilarPointerTypes - If T1 and T2 are pointer types (FIXME: |
| /// or pointer-to-member types) that may be similar (C++ 4.4), |
| /// replaces T1 and T2 with the type that they point to and return |
| /// true. If T1 and T2 aren't pointer types or pointer-to-member |
| /// types, or if they are not similar at this level, returns false and |
| /// leaves T1 and T2 unchanged. Top-level qualifiers on T1 and T2 are |
| /// ignored. This function will typically be called in a loop that |
| /// successively "unwraps" pointer and pointer-to-member types to |
| /// compare them at each level. |
| bool Sema::UnwrapSimilarPointerTypes(QualType& T1, QualType& T2) |
| { |
| const PointerType *T1PtrType = T1->getAsPointerType(), |
| *T2PtrType = T2->getAsPointerType(); |
| if (T1PtrType && T2PtrType) { |
| T1 = T1PtrType->getPointeeType(); |
| T2 = T2PtrType->getPointeeType(); |
| return true; |
| } |
| |
| // FIXME: pointer-to-member types |
| return false; |
| } |
| |
| Sema::TypeResult Sema::ActOnTypeName(Scope *S, Declarator &D) { |
| // C99 6.7.6: Type names have no identifier. This is already validated by |
| // the parser. |
| assert(D.getIdentifier() == 0 && "Type name should have no identifier!"); |
| |
| QualType T = GetTypeForDeclarator(D, S); |
| |
| assert(!T.isNull() && "GetTypeForDeclarator() returned null type"); |
| |
| // Check that there are no default arguments (C++ only). |
| if (getLangOptions().CPlusPlus) |
| CheckExtraCXXDefaultArguments(D); |
| |
| // In this context, we *do not* check D.getInvalidType(). If the declarator |
| // type was invalid, GetTypeForDeclarator() still returns a "valid" type, |
| // though it will not reflect the user specified type. |
| return T.getAsOpaquePtr(); |
| } |
| |
| |
| |
| //===----------------------------------------------------------------------===// |
| // 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. |
| // Clause 6.7.3 - Type qualifiers: "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); |
| return; |
| } |
| |
| // Check the attribute arguments. |
| if (Attr.getNumArgs() != 1) { |
| S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments, |
| std::string("1")); |
| return; |
| } |
| Expr *ASArgExpr = static_cast<Expr *>(Attr.getArg(0)); |
| llvm::APSInt addrSpace(32); |
| if (!ASArgExpr->isIntegerConstantExpr(addrSpace, S.Context)) { |
| S.Diag(Attr.getLoc(), diag::err_attribute_address_space_not_int, |
| ASArgExpr->getSourceRange()); |
| return; |
| } |
| |
| unsigned ASIdx = static_cast<unsigned>(addrSpace.getZExtValue()); |
| Type = S.Context.getASQualType(Type, ASIdx); |
| } |
| |
| void Sema::ProcessTypeAttributeList(QualType &Result, const AttributeList *AL) { |
| // 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. |
| for (; AL; AL = AL->getNext()) { |
| // If this is an attribute we can handle, do so now, otherwise, add it to |
| // the LeftOverAttrs list for rechaining. |
| switch (AL->getKind()) { |
| default: break; |
| case AttributeList::AT_address_space: |
| HandleAddressSpaceTypeAttribute(Result, *AL, *this); |
| break; |
| } |
| } |
| } |
| |
| |