| //===--- SemaType.cpp - Semantic Analysis for Types -----------------------===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file was developed by Chris Lattner and 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/Decl.h" |
| #include "clang/Parse/DeclSpec.h" |
| #include "clang/Lex/IdentifierTable.h" |
| using namespace clang; |
| |
| /// ConvertDeclSpecToType - Convert the specified declspec to the appropriate |
| /// type object. This returns null on error. |
| static QualType ConvertDeclSpecToType(const DeclSpec &DS, ASTContext &Ctx) { |
| // FIXME: Should move the logic from DeclSpec::Finish to here for validity |
| // checking. |
| |
| switch (DS.getTypeSpecType()) { |
| default: return QualType(); // FIXME: Handle unimp cases! |
| case DeclSpec::TST_void: return Ctx.VoidTy; |
| case DeclSpec::TST_char: |
| if (DS.getTypeSpecSign() == DeclSpec::TSS_unspecified) |
| return Ctx.CharTy; |
| else if (DS.getTypeSpecSign() == DeclSpec::TSS_signed) |
| return Ctx.SignedCharTy; |
| else { |
| assert(DS.getTypeSpecSign() == DeclSpec::TSS_unsigned && |
| "Unknown TSS value"); |
| return Ctx.UnsignedCharTy; |
| } |
| case DeclSpec::TST_unspecified: // Unspecific typespec defaults to int. |
| case DeclSpec::TST_int: |
| if (DS.getTypeSpecSign() != DeclSpec::TSS_unsigned) { |
| switch (DS.getTypeSpecWidth()) { |
| case DeclSpec::TSW_unspecified: return Ctx.IntTy; |
| case DeclSpec::TSW_short: return Ctx.ShortTy; |
| case DeclSpec::TSW_long: return Ctx.LongTy; |
| case DeclSpec::TSW_longlong: return Ctx.LongLongTy; |
| } |
| } else { |
| switch (DS.getTypeSpecWidth()) { |
| case DeclSpec::TSW_unspecified: return Ctx.UnsignedIntTy; |
| case DeclSpec::TSW_short: return Ctx.UnsignedShortTy; |
| case DeclSpec::TSW_long: return Ctx.UnsignedLongTy; |
| case DeclSpec::TSW_longlong: return Ctx.UnsignedLongLongTy; |
| } |
| } |
| case DeclSpec::TST_float: |
| if (DS.getTypeSpecComplex() == DeclSpec::TSC_unspecified) |
| return Ctx.FloatTy; |
| assert(DS.getTypeSpecComplex() == DeclSpec::TSC_complex && |
| "FIXME: imaginary types not supported yet!"); |
| return Ctx.FloatComplexTy; |
| |
| case DeclSpec::TST_double: { |
| bool isLong = DS.getTypeSpecWidth() == DeclSpec::TSW_long; |
| if (DS.getTypeSpecComplex() == DeclSpec::TSC_unspecified) |
| return isLong ? Ctx.LongDoubleTy : Ctx.DoubleTy; |
| assert(DS.getTypeSpecComplex() == DeclSpec::TSC_complex && |
| "FIXME: imaginary types not supported yet!"); |
| return isLong ? Ctx.LongDoubleComplexTy : Ctx.DoubleComplexTy; |
| } |
| case DeclSpec::TST_bool: // _Bool or bool |
| return Ctx.BoolTy; |
| 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_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 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. |
| return Ctx.getTagDeclType(cast<TagDecl>(D)); |
| } |
| 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!"); |
| // TypeQuals handled by caller. |
| return Ctx.getTypedefType(cast<TypedefDecl>(D)); |
| } |
| case DeclSpec::TST_typeofType: { |
| QualType T = QualType::getFromOpaquePtr(DS.getTypeRep()); |
| assert(!T.isNull() && "Didn't get a type for typeof?"); |
| // TypeQuals handled by caller. |
| return Ctx.getTypeOfType(T); |
| } |
| case DeclSpec::TST_typeofExpr: { |
| Expr *E = static_cast<Expr *>(DS.getTypeRep()); |
| assert(E && "Didn't get an expression for typeof?"); |
| // TypeQuals handled by caller. |
| return Ctx.getTypeOfExpr(E); |
| } |
| } |
| } |
| |
| /// GetTypeForDeclarator - Convert the type for the specified declarator to Type |
| /// instances. |
| QualType Sema::GetTypeForDeclarator(Declarator &D, Scope *S) { |
| QualType T = ConvertDeclSpecToType(D.getDeclSpec(), Context); |
| |
| // Apply const/volatile/restrict qualifiers to T. |
| T = T.getQualifiedType(D.getDeclSpec().getTypeQualifiers()); |
| |
| // 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) { |
| const DeclaratorChunk &DeclType = D.getTypeObject(e-i-1); |
| switch (DeclType.Kind) { |
| default: assert(0 && "Unknown decltype!"); |
| case DeclaratorChunk::Pointer: |
| if (T->isReferenceType()) { |
| // C++ 8.3.2p4: There shall be no ... pointers to references ... |
| Diag(D.getIdentifierLoc(), diag::err_illegal_decl_pointer_to_reference, |
| D.getIdentifier()->getName()); |
| T = Context.IntTy; |
| } |
| |
| // 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(D.getIdentifierLoc(), |
| diag::err_illegal_decl_reference_to_reference, |
| D.getIdentifier()->getName()); |
| T = RT->getReferenceeType(); |
| } |
| |
| T = Context.getReferenceType(T); |
| break; |
| case DeclaratorChunk::Array: { |
| const DeclaratorChunk::ArrayTypeInfo &ATI = DeclType.Arr; |
| 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; |
| } else if (T->isFunctionType()) { |
| Diag(D.getIdentifierLoc(), diag::err_illegal_decl_array_of_functions, |
| D.getIdentifier()->getName()); |
| T = Context.getPointerType(T); |
| } 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()->getName()); |
| T = RT->getReferenceeType(); |
| } 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; |
| } |
| } |
| T = Context.getArrayType(T, ASM, ATI.TypeQuals, |
| static_cast<Expr *>(ATI.NumElts)); |
| 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; |
| if (!FTI.hasPrototype) { |
| // Simple void foo(), where the incoming T is the result type. |
| T = Context.getFunctionTypeNoProto(T); |
| |
| // C99 6.7.5.3p3: Reject int(x,y,z) when it's not a function definition. |
| if (FTI.NumArgs != 0) |
| 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) { |
| QualType ArgTy = QualType::getFromOpaquePtr(FTI.ArgInfo[i].TypeInfo); |
| assert(!ArgTy.isNull() && "Couldn't parse type?"); |
| |
| // Look for 'void'. void is allowed only as a single argument to a |
| // function with no other parameters (C99 6.7.5.3p10). We record |
| // int(void) as a FunctionTypeProto with an empty argument list. |
| if (ArgTy->isVoidType()) { |
| // If this is something like 'float(int, void)', reject it. 'void' |
| // is an incomplete type (C99 6.2.5p19) and function decls cannot |
| // have arguments of incomplete type. |
| if (FTI.NumArgs != 1 || FTI.isVariadic) { |
| Diag(DeclType.Loc, diag::err_void_only_param); |
| ArgTy = Context.IntTy; |
| FTI.ArgInfo[i].TypeInfo = ArgTy.getAsOpaquePtr(); |
| } 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; |
| FTI.ArgInfo[i].TypeInfo = ArgTy.getAsOpaquePtr(); |
| } else { |
| // Reject, but continue to parse 'float(const void)'. |
| if (ArgTy.getQualifiers()) |
| Diag(DeclType.Loc, diag::err_void_param_qualified); |
| |
| // Do not add 'void' to the ArgTys list. |
| break; |
| } |
| } |
| |
| ArgTys.push_back(ArgTy); |
| } |
| T = Context.getFunctionType(T, &ArgTys[0], ArgTys.size(), |
| FTI.isVariadic); |
| } |
| break; |
| } |
| } |
| |
| return T; |
| } |
| |
| Sema::TypeResult Sema::ParseTypeName(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 the type of the declarator was invalid, this is an invalid typename. |
| if (T.isNull()) |
| return true; |
| |
| return T.getAsOpaquePtr(); |
| } |
| |
| Sema::TypeResult Sema::ParseParamDeclaratorType(Scope *S, Declarator &D) { |
| // Note: parameters have identifiers, but we don't care about them here, we |
| // just want the type converted. |
| QualType T = GetTypeForDeclarator(D, S); |
| |
| // If the type of the declarator was invalid, this is an invalid typename. |
| if (T.isNull()) |
| return true; |
| |
| return T.getAsOpaquePtr(); |
| } |