зеркало из https://github.com/microsoft/clang-1.git
499 строки
20 KiB
C++
499 строки
20 KiB
C++
//===--- SemaType.cpp - Semantic Analysis for Types -----------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements type-related semantic analysis.
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//
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//===----------------------------------------------------------------------===//
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#include "Sema.h"
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#include "clang/AST/ASTContext.h"
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#include "clang/AST/Decl.h"
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#include "clang/AST/DeclObjC.h"
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#include "clang/Parse/DeclSpec.h"
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#include "clang/Basic/LangOptions.h"
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using namespace clang;
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/// ConvertDeclSpecToType - Convert the specified declspec to the appropriate
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/// type object. This returns null on error.
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QualType Sema::ConvertDeclSpecToType(DeclSpec &DS) {
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// FIXME: Should move the logic from DeclSpec::Finish to here for validity
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// checking.
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QualType Result;
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switch (DS.getTypeSpecType()) {
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default: return QualType(); // FIXME: Handle unimp cases!
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case DeclSpec::TST_void: return Context.VoidTy;
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case DeclSpec::TST_char:
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if (DS.getTypeSpecSign() == DeclSpec::TSS_unspecified)
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Result = Context.CharTy;
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else if (DS.getTypeSpecSign() == DeclSpec::TSS_signed)
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Result = Context.SignedCharTy;
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else {
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assert(DS.getTypeSpecSign() == DeclSpec::TSS_unsigned &&
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"Unknown TSS value");
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Result = Context.UnsignedCharTy;
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}
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break;
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case DeclSpec::TST_unspecified: // Unspecific typespec defaults to int.
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case DeclSpec::TST_int: {
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if (DS.getTypeSpecSign() != DeclSpec::TSS_unsigned) {
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switch (DS.getTypeSpecWidth()) {
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case DeclSpec::TSW_unspecified: Result = Context.IntTy; break;
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case DeclSpec::TSW_short: Result = Context.ShortTy; break;
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case DeclSpec::TSW_long: Result = Context.LongTy; break;
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case DeclSpec::TSW_longlong: Result = Context.LongLongTy; break;
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}
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} else {
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switch (DS.getTypeSpecWidth()) {
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case DeclSpec::TSW_unspecified: Result = Context.UnsignedIntTy; break;
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case DeclSpec::TSW_short: Result = Context.UnsignedShortTy; break;
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case DeclSpec::TSW_long: Result = Context.UnsignedLongTy; break;
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case DeclSpec::TSW_longlong: Result =Context.UnsignedLongLongTy; break;
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}
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}
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break;
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}
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case DeclSpec::TST_float: Result = Context.FloatTy; break;
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case DeclSpec::TST_double:
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if (DS.getTypeSpecWidth() == DeclSpec::TSW_long)
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Result = Context.LongDoubleTy;
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else
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Result = Context.DoubleTy;
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break;
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case DeclSpec::TST_bool: Result = Context.BoolTy; break; // _Bool or bool
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case DeclSpec::TST_decimal32: // _Decimal32
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case DeclSpec::TST_decimal64: // _Decimal64
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case DeclSpec::TST_decimal128: // _Decimal128
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assert(0 && "FIXME: GNU decimal extensions not supported yet!");
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case DeclSpec::TST_enum:
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case DeclSpec::TST_union:
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case DeclSpec::TST_struct: {
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Decl *D = static_cast<Decl *>(DS.getTypeRep());
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assert(D && "Didn't get a decl for a enum/union/struct?");
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assert(DS.getTypeSpecWidth() == 0 && DS.getTypeSpecComplex() == 0 &&
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DS.getTypeSpecSign() == 0 &&
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"Can't handle qualifiers on typedef names yet!");
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// TypeQuals handled by caller.
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Result = Context.getTagDeclType(cast<TagDecl>(D));
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break;
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}
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case DeclSpec::TST_typedef: {
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Decl *D = static_cast<Decl *>(DS.getTypeRep());
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assert(D && "Didn't get a decl for a typedef?");
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assert(DS.getTypeSpecWidth() == 0 && DS.getTypeSpecComplex() == 0 &&
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DS.getTypeSpecSign() == 0 &&
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"Can't handle qualifiers on typedef names yet!");
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// FIXME: Adding a TST_objcInterface clause doesn't seem ideal, so
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// we have this "hack" for now...
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if (ObjCInterfaceDecl *ObjCIntDecl = dyn_cast<ObjCInterfaceDecl>(D)) {
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if (DS.getProtocolQualifiers() == 0) {
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Result = Context.getObjCInterfaceType(ObjCIntDecl);
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break;
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}
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Action::DeclTy **PPDecl = &(*DS.getProtocolQualifiers())[0];
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Result = Context.getObjCQualifiedInterfaceType(ObjCIntDecl,
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reinterpret_cast<ObjCProtocolDecl**>(PPDecl),
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DS.getNumProtocolQualifiers());
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break;
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}
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else if (TypedefDecl *typeDecl = dyn_cast<TypedefDecl>(D)) {
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if (Context.getObjCIdType() == Context.getTypedefType(typeDecl)
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&& DS.getProtocolQualifiers()) {
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// id<protocol-list>
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Action::DeclTy **PPDecl = &(*DS.getProtocolQualifiers())[0];
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Result = Context.getObjCQualifiedIdType(typeDecl->getUnderlyingType(),
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reinterpret_cast<ObjCProtocolDecl**>(PPDecl),
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DS.getNumProtocolQualifiers());
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break;
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}
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}
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// TypeQuals handled by caller.
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Result = Context.getTypedefType(cast<TypedefDecl>(D));
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break;
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}
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case DeclSpec::TST_typeofType:
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Result = QualType::getFromOpaquePtr(DS.getTypeRep());
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assert(!Result.isNull() && "Didn't get a type for typeof?");
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// TypeQuals handled by caller.
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Result = Context.getTypeOfType(Result);
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break;
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case DeclSpec::TST_typeofExpr: {
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Expr *E = static_cast<Expr *>(DS.getTypeRep());
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assert(E && "Didn't get an expression for typeof?");
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// TypeQuals handled by caller.
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Result = Context.getTypeOfExpr(E);
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break;
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}
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}
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// Handle complex types.
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if (DS.getTypeSpecComplex() == DeclSpec::TSC_complex)
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Result = Context.getComplexType(Result);
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assert(DS.getTypeSpecComplex() != DeclSpec::TSC_imaginary &&
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"FIXME: imaginary types not supported yet!");
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// See if there are any attributes on the declspec that apply to the type (as
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// opposed to the decl).
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if (AttributeList *AL = DS.getAttributes())
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DS.SetAttributes(ProcessTypeAttributes(Result, AL));
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return Result;
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}
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/// GetTypeForDeclarator - Convert the type for the specified declarator to Type
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/// instances.
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QualType Sema::GetTypeForDeclarator(Declarator &D, Scope *S) {
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// long long is a C99 feature.
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if (!getLangOptions().C99 && !getLangOptions().CPlusPlus0x &&
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D.getDeclSpec().getTypeSpecWidth() == DeclSpec::TSW_longlong)
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Diag(D.getDeclSpec().getTypeSpecWidthLoc(), diag::ext_longlong);
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QualType T = ConvertDeclSpecToType(D.getDeclSpec());
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// Apply const/volatile/restrict qualifiers to T.
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T = T.getQualifiedType(D.getDeclSpec().getTypeQualifiers());
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// Walk the DeclTypeInfo, building the recursive type as we go. DeclTypeInfos
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// are ordered from the identifier out, which is opposite of what we want :).
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for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) {
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DeclaratorChunk &DeclType = D.getTypeObject(e-i-1);
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switch (DeclType.Kind) {
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default: assert(0 && "Unknown decltype!");
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case DeclaratorChunk::Pointer:
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if (T->isReferenceType()) {
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// C++ 8.3.2p4: There shall be no ... pointers to references ...
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Diag(D.getIdentifierLoc(), diag::err_illegal_decl_pointer_to_reference,
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D.getIdentifier() ? D.getIdentifier()->getName() : "type name");
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D.setInvalidType(true);
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T = Context.IntTy;
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}
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// Apply the pointer typequals to the pointer object.
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T = Context.getPointerType(T).getQualifiedType(DeclType.Ptr.TypeQuals);
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// See if there are any attributes on the pointer that apply to it.
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if (AttributeList *AL = DeclType.Ptr.AttrList)
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DeclType.Ptr.AttrList = ProcessTypeAttributes(T, AL);
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break;
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case DeclaratorChunk::Reference:
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if (const ReferenceType *RT = T->getAsReferenceType()) {
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// C++ 8.3.2p4: There shall be no references to references.
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Diag(D.getIdentifierLoc(),
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diag::err_illegal_decl_reference_to_reference,
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D.getIdentifier() ? D.getIdentifier()->getName() : "type name");
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D.setInvalidType(true);
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T = RT->getReferenceeType();
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}
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T = Context.getReferenceType(T);
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// FIXME: Handle Ref.Restrict!
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// See if there are any attributes on the pointer that apply to it.
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if (AttributeList *AL = DeclType.Ref.AttrList)
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DeclType.Ref.AttrList = ProcessTypeAttributes(T, AL);
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break;
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case DeclaratorChunk::Array: {
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const DeclaratorChunk::ArrayTypeInfo &ATI = DeclType.Arr;
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Expr *ArraySize = static_cast<Expr*>(ATI.NumElts);
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ArrayType::ArraySizeModifier ASM;
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if (ATI.isStar)
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ASM = ArrayType::Star;
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else if (ATI.hasStatic)
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ASM = ArrayType::Static;
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else
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ASM = ArrayType::Normal;
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// C99 6.7.5.2p1: If the element type is an incomplete or function type,
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// reject it (e.g. void ary[7], struct foo ary[7], void ary[7]())
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if (T->isIncompleteType()) {
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Diag(D.getIdentifierLoc(), diag::err_illegal_decl_array_incomplete_type,
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T.getAsString());
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T = Context.IntTy;
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D.setInvalidType(true);
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} else if (T->isFunctionType()) {
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Diag(D.getIdentifierLoc(), diag::err_illegal_decl_array_of_functions,
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D.getIdentifier() ? D.getIdentifier()->getName() : "type name");
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T = Context.getPointerType(T);
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D.setInvalidType(true);
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} else if (const ReferenceType *RT = T->getAsReferenceType()) {
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// C++ 8.3.2p4: There shall be no ... arrays of references ...
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Diag(D.getIdentifierLoc(), diag::err_illegal_decl_array_of_references,
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D.getIdentifier() ? D.getIdentifier()->getName() : "type name");
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T = RT->getReferenceeType();
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D.setInvalidType(true);
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} else if (const RecordType *EltTy = T->getAsRecordType()) {
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// If the element type is a struct or union that contains a variadic
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// array, reject it: C99 6.7.2.1p2.
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if (EltTy->getDecl()->hasFlexibleArrayMember()) {
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Diag(DeclType.Loc, diag::err_flexible_array_in_array,
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T.getAsString());
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T = Context.IntTy;
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D.setInvalidType(true);
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}
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}
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// C99 6.7.5.2p1: The size expression shall have integer type.
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if (ArraySize && !ArraySize->getType()->isIntegerType()) {
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Diag(ArraySize->getLocStart(), diag::err_array_size_non_int,
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ArraySize->getType().getAsString(), ArraySize->getSourceRange());
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D.setInvalidType(true);
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}
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llvm::APSInt ConstVal(32);
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// If no expression was provided, we consider it a VLA.
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if (!ArraySize) {
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T = Context.getIncompleteArrayType(T, ASM, ATI.TypeQuals);
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} else if (!ArraySize->isIntegerConstantExpr(ConstVal, Context)) {
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T = Context.getVariableArrayType(T, ArraySize, ASM, ATI.TypeQuals);
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} else {
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// C99 6.7.5.2p1: If the expression is a constant expression, it shall
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// have a value greater than zero.
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if (ConstVal.isSigned()) {
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if (ConstVal.isNegative()) {
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Diag(ArraySize->getLocStart(),
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diag::err_typecheck_negative_array_size,
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ArraySize->getSourceRange());
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D.setInvalidType(true);
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} else if (ConstVal == 0) {
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// GCC accepts zero sized static arrays.
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Diag(ArraySize->getLocStart(), diag::ext_typecheck_zero_array_size,
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ArraySize->getSourceRange());
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}
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}
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T = Context.getConstantArrayType(T, ConstVal, ASM, ATI.TypeQuals);
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}
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// If this is not C99, extwarn about VLA's and C99 array size modifiers.
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if (!getLangOptions().C99 &&
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(ASM != ArrayType::Normal ||
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(ArraySize && !ArraySize->isIntegerConstantExpr(Context))))
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Diag(D.getIdentifierLoc(), diag::ext_vla);
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break;
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}
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case DeclaratorChunk::Function:
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// If the function declarator has a prototype (i.e. it is not () and
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// does not have a K&R-style identifier list), then the arguments are part
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// of the type, otherwise the argument list is ().
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const DeclaratorChunk::FunctionTypeInfo &FTI = DeclType.Fun;
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// C99 6.7.5.3p1: The return type may not be a function or array type.
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if (T->isArrayType() || T->isFunctionType()) {
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Diag(DeclType.Loc, diag::err_func_returning_array_function,
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T.getAsString());
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T = Context.IntTy;
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D.setInvalidType(true);
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}
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if (!FTI.hasPrototype) {
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// Simple void foo(), where the incoming T is the result type.
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T = Context.getFunctionTypeNoProto(T);
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// C99 6.7.5.3p3: Reject int(x,y,z) when it's not a function definition.
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if (FTI.NumArgs != 0)
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Diag(FTI.ArgInfo[0].IdentLoc, diag::err_ident_list_in_fn_declaration);
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} else {
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// Otherwise, we have a function with an argument list that is
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// potentially variadic.
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llvm::SmallVector<QualType, 16> ArgTys;
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for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) {
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QualType ArgTy = QualType::getFromOpaquePtr(FTI.ArgInfo[i].TypeInfo);
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assert(!ArgTy.isNull() && "Couldn't parse type?");
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//
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// Perform the default function/array conversion (C99 6.7.5.3p[7,8]).
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// This matches the conversion that is done in
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// Sema::ActOnParamDeclarator(). Without this conversion, the
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// argument type in the function prototype *will not* match the
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// type in ParmVarDecl (which makes the code generator unhappy).
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//
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// FIXME: We still apparently need the conversion in
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// Sema::ParseParamDeclarator(). This doesn't make any sense, since
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// it should be driving off the type being created here.
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//
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// FIXME: If a source translation tool needs to see the original type,
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// then we need to consider storing both types somewhere...
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//
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if (const ArrayType *AT = ArgTy->getAsArrayType()) {
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// int x[restrict 4] -> int *restrict
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ArgTy = Context.getPointerType(AT->getElementType());
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ArgTy = ArgTy.getQualifiedType(AT->getIndexTypeQualifier());
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} else if (ArgTy->isFunctionType())
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ArgTy = Context.getPointerType(ArgTy);
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// Look for 'void'. void is allowed only as a single argument to a
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// function with no other parameters (C99 6.7.5.3p10). We record
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// int(void) as a FunctionTypeProto with an empty argument list.
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else if (ArgTy->isVoidType()) {
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// If this is something like 'float(int, void)', reject it. 'void'
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// is an incomplete type (C99 6.2.5p19) and function decls cannot
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// have arguments of incomplete type.
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if (FTI.NumArgs != 1 || FTI.isVariadic) {
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Diag(DeclType.Loc, diag::err_void_only_param);
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ArgTy = Context.IntTy;
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FTI.ArgInfo[i].TypeInfo = ArgTy.getAsOpaquePtr();
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} else if (FTI.ArgInfo[i].Ident) {
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// Reject, but continue to parse 'int(void abc)'.
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Diag(FTI.ArgInfo[i].IdentLoc,
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diag::err_param_with_void_type);
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ArgTy = Context.IntTy;
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FTI.ArgInfo[i].TypeInfo = ArgTy.getAsOpaquePtr();
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} else {
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// Reject, but continue to parse 'float(const void)'.
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if (ArgTy.getCVRQualifiers())
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Diag(DeclType.Loc, diag::err_void_param_qualified);
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// Do not add 'void' to the ArgTys list.
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break;
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}
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}
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ArgTys.push_back(ArgTy);
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}
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T = Context.getFunctionType(T, &ArgTys[0], ArgTys.size(),
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FTI.isVariadic);
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}
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break;
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}
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}
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return T;
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}
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/// ObjCGetTypeForMethodDefinition - Builds the type for a method definition
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/// declarator
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QualType Sema::ObjCGetTypeForMethodDefinition(DeclTy *D) {
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ObjCMethodDecl *MDecl = dyn_cast<ObjCMethodDecl>(static_cast<Decl *>(D));
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QualType T = MDecl->getResultType();
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llvm::SmallVector<QualType, 16> ArgTys;
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// Add the first two invisible argument types for self and _cmd.
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if (MDecl->isInstance()) {
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QualType selfTy = Context.getObjCInterfaceType(MDecl->getClassInterface());
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selfTy = Context.getPointerType(selfTy);
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ArgTys.push_back(selfTy);
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}
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else
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ArgTys.push_back(Context.getObjCIdType());
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ArgTys.push_back(Context.getObjCSelType());
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for (int i = 0; i < MDecl->getNumParams(); i++) {
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ParmVarDecl *PDecl = MDecl->getParamDecl(i);
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QualType ArgTy = PDecl->getType();
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assert(!ArgTy.isNull() && "Couldn't parse type?");
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// Perform the default function/array conversion (C99 6.7.5.3p[7,8]).
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// This matches the conversion that is done in
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// Sema::ParseParamDeclarator().
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if (const ArrayType *AT = ArgTy->getAsArrayType())
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ArgTy = Context.getPointerType(AT->getElementType());
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else if (ArgTy->isFunctionType())
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ArgTy = Context.getPointerType(ArgTy);
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ArgTys.push_back(ArgTy);
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}
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T = Context.getFunctionType(T, &ArgTys[0], ArgTys.size(),
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MDecl->isVariadic());
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return T;
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}
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Sema::TypeResult Sema::ActOnTypeName(Scope *S, Declarator &D) {
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// C99 6.7.6: Type names have no identifier. This is already validated by
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// the parser.
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assert(D.getIdentifier() == 0 && "Type name should have no identifier!");
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QualType T = GetTypeForDeclarator(D, S);
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assert(!T.isNull() && "GetTypeForDeclarator() returned null type");
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// In this context, we *do not* check D.getInvalidType(). If the declarator
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// type was invalid, GetTypeForDeclarator() still returns a "valid" type,
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// though it will not reflect the user specified type.
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return T.getAsOpaquePtr();
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}
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// Called from Parser::ParseParenDeclarator().
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Sema::TypeResult Sema::ActOnParamDeclaratorType(Scope *S, Declarator &D) {
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// Note: parameters have identifiers, but we don't care about them here, we
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// just want the type converted.
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QualType T = GetTypeForDeclarator(D, S);
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assert(!T.isNull() && "GetTypeForDeclarator() returned null type");
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// In this context, we *do not* check D.getInvalidType(). If the declarator
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// type was invalid, GetTypeForDeclarator() still returns a "valid" type,
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// though it will not reflect the user specified type.
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return T.getAsOpaquePtr();
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}
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AttributeList *Sema::ProcessTypeAttributes(QualType &Result, AttributeList *AL){
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// 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 and delete attributes that apply to the
|
|
// type and leave the others alone.
|
|
llvm::SmallVector<AttributeList *, 8> LeftOverAttrs;
|
|
while (AL) {
|
|
// Unlink this attribute from the chain, so we can process it independently.
|
|
AttributeList *ThisAttr = AL;
|
|
AL = AL->getNext();
|
|
ThisAttr->setNext(0);
|
|
|
|
// If this is an attribute we can handle, do so now, otherwise, add it to
|
|
// the LeftOverAttrs list for rechaining.
|
|
switch (ThisAttr->getKind()) {
|
|
default: break;
|
|
case AttributeList::AT_address_space:
|
|
Result = HandleAddressSpaceTypeAttribute(Result, ThisAttr);
|
|
delete ThisAttr; // Consume the attribute.
|
|
continue;
|
|
}
|
|
|
|
LeftOverAttrs.push_back(ThisAttr);
|
|
}
|
|
|
|
// Rechain any attributes that haven't been deleted to the DeclSpec.
|
|
AttributeList *List = 0;
|
|
for (unsigned i = 0, e = LeftOverAttrs.size(); i != e; ++i) {
|
|
LeftOverAttrs[i]->setNext(List);
|
|
List = LeftOverAttrs[i];
|
|
}
|
|
|
|
return List;
|
|
}
|
|
|
|
/// HandleAddressSpaceTypeAttribute - Process an address_space attribute on the
|
|
/// specified type.
|
|
QualType Sema::HandleAddressSpaceTypeAttribute(QualType Type,
|
|
AttributeList *Attr) {
|
|
// 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()) {
|
|
Diag(Attr->getLoc(), diag::err_attribute_address_multiple_qualifiers);
|
|
return Type;
|
|
}
|
|
|
|
// Check the attribute arguments.
|
|
if (Attr->getNumArgs() != 1) {
|
|
Diag(Attr->getLoc(), diag::err_attribute_wrong_number_arguments,
|
|
std::string("1"));
|
|
return Type;
|
|
}
|
|
Expr *ASArgExpr = static_cast<Expr *>(Attr->getArg(0));
|
|
llvm::APSInt addrSpace(32);
|
|
if (!ASArgExpr->isIntegerConstantExpr(addrSpace, Context)) {
|
|
Diag(Attr->getLoc(), diag::err_attribute_address_space_not_int,
|
|
ASArgExpr->getSourceRange());
|
|
return Type;
|
|
}
|
|
|
|
unsigned ASIdx = static_cast<unsigned>(addrSpace.getZExtValue());
|
|
return Context.getASQualType(Type, ASIdx);
|
|
}
|
|
|