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//===--- MinimalAction.cpp - Implement the MinimalAction class ------------===//
//
// 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 the MinimalAction interface.
//
//===----------------------------------------------------------------------===//
#include "clang/Parse/Parser.h"
#include "clang/Parse/SemaDeclSpec.h"
#include "clang/Parse/Scope.h"
using namespace llvm;
using namespace clang;
/// TypeNameInfo - A link exists here for each scope that an identifier is
/// defined.
struct TypeNameInfo {
TypeNameInfo *Prev;
bool isTypeName;
TypeNameInfo(bool istypename, TypeNameInfo *prev) {
isTypeName = istypename;
Prev = prev;
}
};
/// isTypeName - This looks at the IdentifierInfo::FETokenInfo field to
/// determine whether the name is a type name (objc class name or typedef) or
/// not in this scope.
bool MinimalAction::isTypeName(const IdentifierInfo &II, Scope *S) const {
TypeNameInfo *TI = II.getFETokenInfo<TypeNameInfo>();
return TI != 0 && TI->isTypeName;
}
/// ParseDeclarator - If this is a typedef declarator, we modify the
/// IdentifierInfo::FETokenInfo field to keep track of this fact, until S is
/// popped.
Action::DeclTy *
MinimalAction::ParseDeclarator(Scope *S, Declarator &D, ExprTy *Init,
DeclTy *LastInGroup) {
IdentifierInfo *II = D.getIdentifier();
// If there is no identifier associated with this declarator, bail out.
if (II == 0) return 0;
TypeNameInfo *weCurrentlyHaveTypeInfo = II->getFETokenInfo<TypeNameInfo>();
bool isTypeName = D.getDeclSpec().StorageClassSpec == DeclSpec::SCS_typedef;
// this check avoids creating TypeNameInfo objects for the common case.
// It does need to handle the uncommon case of shadowing a typedef name with a
// non-typedef name. e.g. { typedef int a; a xx; { int a; } }
if (weCurrentlyHaveTypeInfo || isTypeName) {
TypeNameInfo *TI = new TypeNameInfo(isTypeName, weCurrentlyHaveTypeInfo);
II->setFETokenInfo(TI);
// Remember that this needs to be removed when the scope is popped.
S->AddDecl(II);
}
return 0;
}
/// ParsedClassDeclaration -
/// Scope will always be top level file scope.
Action::DeclTy *
MinimalAction::ParsedClassDeclaration(Scope *S,
IdentifierInfo **IdentList,
unsigned NumElts) {
for (unsigned i = 0; i != NumElts; ++i) {
TypeNameInfo *TI =
new TypeNameInfo(1, IdentList[i]->getFETokenInfo<TypeNameInfo>());
IdentList[i]->setFETokenInfo(TI);
// Remember that this needs to be removed when the scope is popped.
S->AddDecl(IdentList[i]);
}
return 0;
}
/// PopScope - When a scope is popped, if any typedefs are now out-of-scope,
/// they are removed from the IdentifierInfo::FETokenInfo field.
void MinimalAction::PopScope(SourceLocation Loc, Scope *S) {
for (Scope::decl_iterator I = S->decl_begin(), E = S->decl_end();
I != E; ++I) {
IdentifierInfo &II = *static_cast<IdentifierInfo*>(*I);
TypeNameInfo *TI = II.getFETokenInfo<TypeNameInfo>();
assert(TI && "This decl didn't get pushed??");
if (TI) {
TypeNameInfo *Next = TI->Prev;
delete TI;
II.setFETokenInfo(Next);
}
}
}
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