| //===--- 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/Parse/DeclSpec.h" |
| using namespace clang; |
| |
| /// \brief Convert the specified declspec to the appropriate type |
| /// object. |
| /// \param DS the declaration specifiers |
| /// \returns The type described by the declaration specifiers, or NULL |
| /// if there was an 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()) { |
| 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 if (!DS.hasTypeSpecifier()) { |
| // C99 and C++ require a type specifier. For example, C99 6.7.2p2 says: |
| // "At least one type specifier shall be given in the declaration |
| // specifiers in each declaration, and in the specifier-qualifier list in |
| // each struct declaration and type name." |
| // FIXME: Does Microsoft really have the implicit int extension in C++? |
| unsigned DK = getLangOptions().CPlusPlus && !getLangOptions().Microsoft? |
| diag::err_missing_type_specifier |
| : diag::ext_missing_type_specifier; |
| Diag(DS.getSourceRange().getBegin(), DK); |
| } |
| |
| // 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_typename: { |
| assert(DS.getTypeSpecWidth() == 0 && DS.getTypeSpecComplex() == 0 && |
| DS.getTypeSpecSign() == 0 && |
| "Can't handle qualifiers on typedef names yet!"); |
| Result = QualType::getFromOpaquePtr(DS.getTypeRep()); |
| |
| if (DeclSpec::ProtocolQualifierListTy PQ = DS.getProtocolQualifiers()) { |
| // FIXME: Adding a TST_objcInterface clause doesn't seem ideal, so |
| // we have this "hack" for now... |
| if (const ObjCInterfaceType *Interface = Result->getAsObjCInterfaceType()) |
| Result = Context.getObjCQualifiedInterfaceType(Interface->getDecl(), |
| (ObjCProtocolDecl**)PQ, |
| DS.getNumProtocolQualifiers()); |
| else if (Result == Context.getObjCIdType()) |
| // id<protocol-list> |
| Result = Context.getObjCQualifiedIdType((ObjCProtocolDecl**)PQ, |
| DS.getNumProtocolQualifiers()); |
| else |
| Diag(DS.getSourceRange().getBegin(), |
| diag::warn_ignoring_objc_qualifiers) << DS.getSourceRange(); |
| } |
| // TypeQuals handled by caller. |
| 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; |
| } |
| case DeclSpec::TST_error: |
| return QualType(); |
| } |
| |
| // Handle complex types. |
| if (DS.getTypeSpecComplex() == DeclSpec::TSC_complex) { |
| if (getLangOptions().Freestanding) |
| Diag(DS.getTypeSpecComplexLoc(), diag::ext_freestanding_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 << DS.getSourceRange(); |
| TypeQuals &= ~QualType::Restrict; // Remove the restrict qualifier. |
| } |
| } else { |
| Diag(DS.getRestrictSpecLoc(), |
| diag::err_typecheck_invalid_restrict_not_pointer) |
| << Result << 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 << DS.getSourceRange(); |
| } |
| |
| // C++ [dcl.ref]p1: |
| // Cv-qualified references are ill-formed except when the |
| // cv-qualifiers are introduced through the use of a typedef |
| // (7.1.3) or of a template type argument (14.3), in which |
| // case the cv-qualifiers are ignored. |
| // FIXME: Shouldn't we be checking SCS_typedef here? |
| if (DS.getTypeSpecType() == DeclSpec::TST_typename && |
| TypeQuals && Result->isReferenceType()) { |
| TypeQuals &= ~QualType::Const; |
| TypeQuals &= ~QualType::Volatile; |
| } |
| |
| Result = Result.getQualifiedType(TypeQuals); |
| } |
| return Result; |
| } |
| |
| /// GetTypeForDeclarator - Convert the type for the specified |
| /// declarator to Type instances. Skip the outermost Skip type |
| /// objects. |
| QualType Sema::GetTypeForDeclarator(Declarator &D, Scope *S, unsigned Skip) { |
| bool OmittedReturnType = false; |
| |
| if (D.getContext() == Declarator::BlockLiteralContext |
| && Skip == 0 |
| && !D.getDeclSpec().hasTypeSpecifier() |
| && (D.getNumTypeObjects() == 0 |
| || (D.getNumTypeObjects() == 1 |
| && D.getTypeObject(0).Kind == DeclaratorChunk::Function))) |
| OmittedReturnType = true; |
| |
| // long long is a C99 feature. |
| if (!getLangOptions().C99 && !getLangOptions().CPlusPlus0x && |
| D.getDeclSpec().getTypeSpecWidth() == DeclSpec::TSW_longlong) |
| Diag(D.getDeclSpec().getTypeSpecWidthLoc(), diag::ext_longlong); |
| |
| // Determine the type of the declarator. Not all forms of declarator |
| // have a type. |
| QualType T; |
| switch (D.getKind()) { |
| case Declarator::DK_Abstract: |
| case Declarator::DK_Normal: |
| case Declarator::DK_Operator: { |
| const DeclSpec& DS = D.getDeclSpec(); |
| if (OmittedReturnType) |
| // We default to a dependent type initially. Can be modified by |
| // the first return statement. |
| T = Context.DependentTy; |
| else { |
| T = ConvertDeclSpecToType(DS); |
| if (T.isNull()) |
| return T; |
| } |
| break; |
| } |
| |
| case Declarator::DK_Constructor: |
| case Declarator::DK_Destructor: |
| case Declarator::DK_Conversion: |
| // Constructors and destructors don't have return types. Use |
| // "void" instead. Conversion operators will check their return |
| // types separately. |
| T = Context.VoidTy; |
| break; |
| } |
| |
| // 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 = Skip, e = D.getNumTypeObjects(); i != e; ++i) { |
| DeclaratorChunk &DeclType = D.getTypeObject(e-i-1+Skip); |
| 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; |
| 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: { |
| // Whether we should suppress the creation of the reference. |
| bool SuppressReference = false; |
| if (T->isReferenceType()) { |
| // 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::ParserDeclaratorInternal diagnoses the case where |
| // references are written directly; here, we handle the |
| // collapsing of references-to-references as described in C++ |
| // DR 106 and amended by C++ DR 540. |
| SuppressReference = true; |
| } |
| |
| // C++ [dcl.ref]p1: |
| // A declarator that specifies the type “reference to cv void” |
| // is ill-formed. |
| if (T->isVoidType()) { |
| Diag(DeclType.Loc, diag::err_reference_to_void); |
| 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.Ref.HasRestrict && |
| !T->isIncompleteOrObjectType()) { |
| Diag(DeclType.Loc, diag::err_typecheck_invalid_restrict_invalid_pointee) |
| << T; |
| DeclType.Ref.HasRestrict = false; |
| } |
| |
| if (!SuppressReference) |
| 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 (DiagnoseIncompleteType(D.getIdentifierLoc(), T, |
| diag::err_illegal_decl_array_incomplete_type)) { |
| 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, accept it as a GNU extension: C99 6.7.2.1p2. |
| if (EltTy->getDecl()->hasFlexibleArrayMember()) |
| Diag(DeclType.Loc, diag::ext_flexible_array_in_array) << T; |
| } else if (T->isObjCInterfaceType()) { |
| Diag(DeclType.Loc, diag::warn_objc_array_of_interfaces) << T; |
| } |
| |
| // 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() << ArraySize->getSourceRange(); |
| D.setInvalidType(true); |
| ArraySize->Destroy(Context); |
| ATI.NumElts = ArraySize = 0; |
| } |
| llvm::APSInt ConstVal(32); |
| if (!ArraySize) { |
| T = Context.getIncompleteArrayType(T, ASM, ATI.TypeQuals); |
| } else if (ArraySize->isValueDependent()) { |
| T = Context.getDependentSizedArrayType(T, ArraySize, 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) { |
| if (ArraySize && !ArraySize->isValueDependent() && |
| !ArraySize->isIntegerConstantExpr(Context)) |
| Diag(D.getIdentifierLoc(), diag::ext_vla); |
| else if (ASM != ArrayType::Normal || ATI.TypeQuals != 0) |
| Diag(D.getIdentifierLoc(), diag::ext_c99_array_usage); |
| } |
| 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; |
| 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,FTI.TypeQuals); |
| } else if (FTI.isVariadic) { |
| // We allow a zero-parameter variadic function in C if the |
| // function is marked with the "overloadable" |
| // attribute. Scan for this attribute now. |
| bool Overloadable = false; |
| for (const AttributeList *Attrs = D.getAttributes(); |
| Attrs; Attrs = Attrs->getNext()) { |
| if (Attrs->getKind() == AttributeList::AT_overloadable) { |
| Overloadable = true; |
| break; |
| } |
| } |
| |
| if (!Overloadable) |
| Diag(FTI.getEllipsisLoc(), diag::err_ellipsis_first_arg); |
| T = Context.getFunctionType(T, NULL, 0, FTI.isVariadic, 0); |
| } 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, FTI.TypeQuals); |
| } |
| break; |
| } |
| case DeclaratorChunk::MemberPointer: |
| // The scope spec must refer to a class, or be dependent. |
| DeclContext *DC = static_cast<DeclContext*>( |
| DeclType.Mem.Scope().getScopeRep()); |
| QualType ClsType; |
| // FIXME: Extend for dependent types when it's actually supported. |
| // See ActOnCXXNestedNameSpecifier. |
| if (CXXRecordDecl *RD = dyn_cast_or_null<CXXRecordDecl>(DC)) { |
| ClsType = Context.getTagDeclType(RD); |
| } else { |
| if (DC) { |
| 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); |
| ClsType = Context.IntTy; |
| } |
| |
| // C++ 8.3.3p3: A pointer to member shall not pointer to ... a member |
| // with reference type, or "cv void." |
| if (T->isReferenceType()) { |
| Diag(DeclType.Loc, diag::err_illegal_decl_pointer_to_reference) |
| << (D.getIdentifier() ? D.getIdentifier()->getName() : "type name"); |
| D.setInvalidType(true); |
| T = Context.IntTy; |
| } |
| if (T->isVoidType()) { |
| Diag(DeclType.Loc, diag::err_illegal_decl_mempointer_to_void) |
| << (D.getIdentifier() ? D.getIdentifier()->getName() : "type name"); |
| 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.Mem.TypeQuals & QualType::Restrict) && |
| !T->isIncompleteOrObjectType()) { |
| Diag(DeclType.Loc, diag::err_typecheck_invalid_restrict_invalid_pointee) |
| << T; |
| DeclType.Mem.TypeQuals &= ~QualType::Restrict; |
| } |
| |
| T = Context.getMemberPointerType(T, ClsType.getTypePtr()). |
| getQualifiedType(DeclType.Mem.TypeQuals); |
| |
| break; |
| } |
| |
| // See if there are any attributes on this declarator chunk. |
| if (const AttributeList *AL = DeclType.getAttrs()) |
| ProcessTypeAttributeList(T, AL); |
| } |
| |
| if (getLangOptions().CPlusPlus && T->isFunctionType()) { |
| const FunctionTypeProto *FnTy = T->getAsFunctionTypeProto(); |
| assert(FnTy && "Why oh why is there not a FunctionTypeProto 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. |
| if (FnTy->getTypeQuals() != 0 && |
| D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && |
| ((D.getContext() != Declarator::MemberContext && |
| (!D.getCXXScopeSpec().isSet() || |
| !static_cast<DeclContext*>(D.getCXXScopeSpec().getScopeRep()) |
| ->isRecord())) || |
| D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_static)) { |
| if (D.isFunctionDeclarator()) |
| Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_function_type); |
| else |
| Diag(D.getIdentifierLoc(), |
| diag::err_invalid_qualified_typedef_function_type_use); |
| |
| // Strip the cv-quals from the type. |
| T = Context.getFunctionType(FnTy->getResultType(), FnTy->arg_type_begin(), |
| FnTy->getNumArgs(), FnTy->isVariadic(), 0); |
| } |
| } |
| |
| // 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 = 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->isInstanceMethod()) { |
| 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 (ObjCMethodDecl::param_iterator PI = MDecl->param_begin(), |
| E = MDecl->param_end(); PI != E; ++PI) { |
| QualType ArgTy = (*PI)->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(), 0); |
| return T; |
| } |
| |
| /// UnwrapSimilarPointerTypes - If T1 and T2 are pointer 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; |
| } |
| |
| const MemberPointerType *T1MPType = T1->getAsMemberPointerType(), |
| *T2MPType = T2->getAsMemberPointerType(); |
| if (T1MPType && T2MPType && |
| Context.getCanonicalType(T1MPType->getClass()) == |
| Context.getCanonicalType(T2MPType->getClass())) { |
| T1 = T1MPType->getPointeeType(); |
| T2 = T2MPType->getPointeeType(); |
| return true; |
| } |
| 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); |
| if (T.isNull()) |
| return true; |
| |
| // Check that there are no default arguments (C++ only). |
| if (getLangOptions().CPlusPlus) |
| CheckExtraCXXDefaultArguments(D); |
| |
| 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) << 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.getAddrSpaceQualType(Type, ASIdx); |
| } |
| |
| /// HandleObjCGCTypeAttribute - Process an objc's gc attribute on the |
| /// specified type. The attribute contains 1 argument, weak or strong. |
| static void HandleObjCGCTypeAttribute(QualType &Type, |
| const AttributeList &Attr, Sema &S) { |
| if (Type.getObjCGCAttr() != QualType::GCNone) { |
| S.Diag(Attr.getLoc(), diag::err_attribute_multiple_objc_gc); |
| return; |
| } |
| |
| // Check the attribute arguments. |
| if (!Attr.getParameterName()) { |
| S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_not_string) |
| << "objc_gc" << 1; |
| return; |
| } |
| QualType::GCAttrTypes GCAttr; |
| if (Attr.getNumArgs() != 0) { |
| S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; |
| return; |
| } |
| if (Attr.getParameterName()->isStr("weak")) |
| GCAttr = QualType::Weak; |
| else if (Attr.getParameterName()->isStr("strong")) |
| GCAttr = QualType::Strong; |
| else { |
| S.Diag(Attr.getLoc(), diag::warn_attribute_type_not_supported) |
| << "objc_gc" << Attr.getParameterName(); |
| return; |
| } |
| |
| Type = S.Context.getObjCGCQualType(Type, GCAttr); |
| } |
| |
| 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; |
| case AttributeList::AT_objc_gc: |
| HandleObjCGCTypeAttribute(Result, *AL, *this); |
| break; |
| } |
| } |
| } |
| |
| /// @brief If the type T is incomplete and cannot be completed, |
| /// produce a suitable diagnostic. |
| /// |
| /// 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 incomplete, 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. |
| /// |
| /// @param diag The diagnostic value (e.g., |
| /// @c diag::err_typecheck_decl_incomplete_type) that will be used |
| /// for the error message if @p T is incomplete. |
| /// |
| /// @param Range1 An optional range in the source code that will be a |
| /// part of the "incomplete type" error message. |
| /// |
| /// @param Range2 An optional range in the source code that will be a |
| /// part of the "incomplete type" error message. |
| /// |
| /// @param PrintType If non-NULL, the type that should be printed |
| /// instead of @p T. This parameter should be used when the type that |
| /// we're checking for incompleteness isn't the type that should be |
| /// displayed to the user, e.g., when T is a type and PrintType is a |
| /// pointer to T. |
| /// |
| /// @returns @c true if @p T is incomplete and a diagnostic was emitted, |
| /// @c false otherwise. |
| /// |
| /// @todo When Clang gets proper support for C++ templates, this |
| /// routine will also be able perform template instantiation when @p T |
| /// is a class template specialization. |
| bool Sema::DiagnoseIncompleteType(SourceLocation Loc, QualType T, unsigned diag, |
| SourceRange Range1, SourceRange Range2, |
| QualType PrintType) { |
| // If we have a complete type, we're done. |
| if (!T->isIncompleteType()) |
| return false; |
| |
| if (PrintType.isNull()) |
| PrintType = T; |
| |
| // We have an incomplete type. Produce a diagnostic. |
| Diag(Loc, diag) << PrintType << Range1 << Range2; |
| |
| // If the type was a forward declaration of a class/struct/union |
| // type, produce |
| const TagType *Tag = 0; |
| if (const RecordType *Record = T->getAsRecordType()) |
| Tag = Record; |
| else if (const EnumType *Enum = T->getAsEnumType()) |
| Tag = Enum; |
| |
| if (Tag && !Tag->getDecl()->isInvalidDecl()) |
| Diag(Tag->getDecl()->getLocation(), |
| Tag->isBeingDefined() ? diag::note_type_being_defined |
| : diag::note_forward_declaration) |
| << QualType(Tag, 0); |
| |
| return true; |
| } |