145 lines
4.9 KiB
C++
145 lines
4.9 KiB
C++
//===--- MinimalAction.cpp - Implement the MinimalAction class ------------===//
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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 the MinimalAction interface.
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//
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//===----------------------------------------------------------------------===//
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#include "clang/Parse/Parser.h"
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#include "clang/Parse/DeclSpec.h"
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#include "clang/Parse/Scope.h"
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using namespace clang;
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/// TypeNameInfo - A link exists here for each scope that an identifier is
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/// defined.
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struct TypeNameInfo {
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TypeNameInfo *Prev;
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bool isTypeName;
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TypeNameInfo(bool istypename, TypeNameInfo *prev) {
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isTypeName = istypename;
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Prev = prev;
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}
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};
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MinimalAction::MinimalAction(Preprocessor &pp)
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: Idents(pp.getIdentifierTable()), PP(pp) {}
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void MinimalAction::ActOnTranslationUnitScope(SourceLocation Loc, Scope *S) {
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TUScope = S;
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if (!PP.getLangOptions().ObjC1) return;
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// recognize the ObjC built-in type identifiers.
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IdentifierInfo *II;
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TypeNameInfo *TI;
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II = &Idents.get("id");
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TI = new TypeNameInfo(1, II->getFETokenInfo<TypeNameInfo>());
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II->setFETokenInfo(TI);
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II = &Idents.get("SEL");
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TI = new TypeNameInfo(1, II->getFETokenInfo<TypeNameInfo>());
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II->setFETokenInfo(TI);
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II = &Idents.get("Class");
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TI = new TypeNameInfo(1, II->getFETokenInfo<TypeNameInfo>());
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II->setFETokenInfo(TI);
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II = &Idents.get("Protocol");
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TI = new TypeNameInfo(1, II->getFETokenInfo<TypeNameInfo>());
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II->setFETokenInfo(TI);
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}
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/// isTypeName - This looks at the IdentifierInfo::FETokenInfo field to
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/// determine whether the name is a type name (objc class name or typedef) or
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/// not in this scope.
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Action::TypeTy *
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MinimalAction::isTypeName(const IdentifierInfo &II, Scope *S) {
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if (TypeNameInfo *TI = II.getFETokenInfo<TypeNameInfo>())
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if (TI->isTypeName)
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return TI;
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return 0;
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}
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/// ActOnDeclarator - If this is a typedef declarator, we modify the
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/// IdentifierInfo::FETokenInfo field to keep track of this fact, until S is
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/// popped.
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Action::DeclTy *
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MinimalAction::ActOnDeclarator(Scope *S, Declarator &D, DeclTy *LastInGroup) {
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IdentifierInfo *II = D.getIdentifier();
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// If there is no identifier associated with this declarator, bail out.
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if (II == 0) return 0;
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TypeNameInfo *weCurrentlyHaveTypeInfo = II->getFETokenInfo<TypeNameInfo>();
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bool isTypeName =
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D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef;
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// this check avoids creating TypeNameInfo objects for the common case.
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// It does need to handle the uncommon case of shadowing a typedef name with a
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// non-typedef name. e.g. { typedef int a; a xx; { int a; } }
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if (weCurrentlyHaveTypeInfo || isTypeName) {
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TypeNameInfo *TI = new TypeNameInfo(isTypeName, weCurrentlyHaveTypeInfo);
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II->setFETokenInfo(TI);
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// Remember that this needs to be removed when the scope is popped.
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S->AddDecl(II);
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}
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return 0;
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}
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Action::DeclTy *
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MinimalAction::ActOnStartClassInterface(SourceLocation AtInterfaceLoc,
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IdentifierInfo *ClassName,
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SourceLocation ClassLoc,
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IdentifierInfo *SuperName,
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SourceLocation SuperLoc,
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DeclTy * const *ProtoRefs,
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unsigned NumProtocols,
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SourceLocation EndProtoLoc,
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AttributeList *AttrList) {
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TypeNameInfo *TI =
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new TypeNameInfo(1, ClassName->getFETokenInfo<TypeNameInfo>());
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ClassName->setFETokenInfo(TI);
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return 0;
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}
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/// ActOnForwardClassDeclaration -
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/// Scope will always be top level file scope.
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Action::DeclTy *
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MinimalAction::ActOnForwardClassDeclaration(SourceLocation AtClassLoc,
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IdentifierInfo **IdentList, unsigned NumElts) {
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for (unsigned i = 0; i != NumElts; ++i) {
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TypeNameInfo *TI =
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new TypeNameInfo(1, IdentList[i]->getFETokenInfo<TypeNameInfo>());
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IdentList[i]->setFETokenInfo(TI);
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// Remember that this needs to be removed when the scope is popped.
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TUScope->AddDecl(IdentList[i]);
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}
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return 0;
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}
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/// ActOnPopScope - When a scope is popped, if any typedefs are now
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/// out-of-scope, they are removed from the IdentifierInfo::FETokenInfo field.
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void MinimalAction::ActOnPopScope(SourceLocation Loc, Scope *S) {
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for (Scope::decl_iterator I = S->decl_begin(), E = S->decl_end();
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I != E; ++I) {
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IdentifierInfo &II = *static_cast<IdentifierInfo*>(*I);
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TypeNameInfo *TI = II.getFETokenInfo<TypeNameInfo>();
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assert(TI && "This decl didn't get pushed??");
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if (TI) {
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TypeNameInfo *Next = TI->Prev;
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delete TI;
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II.setFETokenInfo(Next);
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}
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}
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}
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