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//===--- Entity.cpp - Cross-translation-unit "token" for decls ------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// Entity is a ASTContext-independent way to refer to declarations that are
// visible across translation units.
//
//===----------------------------------------------------------------------===//
#include "EntityImpl.h"
#include "ProgramImpl.h"
#include "clang/Index/Program.h"
#include "clang/AST/Decl.h"
#include "clang/AST/ASTContext.h"
#include "clang/AST/DeclVisitor.h"
using namespace clang;
using namespace idx;
// FIXME: Entity is really really basic currently, mostly written to work
// on variables and functions. Should support types and other decls eventually..
//===----------------------------------------------------------------------===//
// EntityGetter
//===----------------------------------------------------------------------===//
namespace clang {
namespace idx {
/// \brief Gets the Entity associated with a Decl.
class EntityGetter : public DeclVisitor<EntityGetter, Entity> {
ProgramImpl &Prog;
public:
EntityGetter(ProgramImpl &prog) : Prog(prog) { }
Entity VisitNamedDecl(NamedDecl *D);
Entity VisitVarDecl(VarDecl *D);
Entity VisitFunctionDecl(FunctionDecl *D);
};
}
}
Entity EntityGetter::VisitNamedDecl(NamedDecl *D) {
Entity Parent;
if (!D->getDeclContext()->isTranslationUnit()) {
Parent = Visit(cast<Decl>(D->getDeclContext()));
// FIXME: Anonymous structs ?
if (Parent.isInvalid())
return Entity();
}
if (Parent.isValid() && Parent.isInternalToTU())
return Entity(D);
// FIXME: Only works for DeclarationNames that are identifiers.
// Treats other DeclarationNames as internal Decls for now..
DeclarationName Name = D->getDeclName();
if (!Name.isIdentifier())
return Entity(D);
IdentifierInfo *II = Name.getAsIdentifierInfo();
if (!II)
return Entity();
IdentifierInfo *Id = &Prog.getIdents().get(II->getName(),
II->getName() + II->getLength());
unsigned IdNS = D->getIdentifierNamespace();
llvm::FoldingSetNodeID ID;
EntityImpl::Profile(ID, Parent, Id, IdNS);
ProgramImpl::EntitySetTy &Entities = Prog.getEntities();
void *InsertPos = 0;
if (EntityImpl *Ent = Entities.FindNodeOrInsertPos(ID, InsertPos))
return Entity(Ent);
void *Buf = Prog.Allocate(sizeof(EntityImpl));
EntityImpl *New = new (Buf) EntityImpl(Parent, Id, IdNS);
Entities.InsertNode(New, InsertPos);
return Entity(New);
}
Entity EntityGetter::VisitVarDecl(VarDecl *D) {
// If it's static it cannot be referred to by another translation unit.
if (D->getStorageClass() == VarDecl::Static)
return Entity(D);
return VisitNamedDecl(D);
}
Entity EntityGetter::VisitFunctionDecl(FunctionDecl *D) {
// If it's static it cannot be refered to by another translation unit.
if (D->getStorageClass() == FunctionDecl::Static)
return Entity(D);
return VisitNamedDecl(D);
}
//===----------------------------------------------------------------------===//
// EntityImpl Implementation
//===----------------------------------------------------------------------===//
Decl *EntityImpl::getDecl(ASTContext &AST) {
DeclContext *DC =
Parent.isInvalid() ? AST.getTranslationUnitDecl()
: cast<DeclContext>(Parent.getDecl(AST));
if (!DC)
return 0; // Couldn't get the parent context.
IdentifierInfo &II = AST.Idents.get(Id->getName(),
Id->getName() + Id->getLength());
DeclContext::lookup_result Res = DC->lookup(DeclarationName(&II));
for (DeclContext::lookup_iterator I = Res.first, E = Res.second; I!=E; ++I) {
if ((*I)->getIdentifierNamespace() == IdNS)
return *I;
}
return 0; // Failed to find a decl using this Entity.
}
/// \brief Get an Entity associated with the given Decl.
/// \returns Null if an Entity cannot refer to this Decl.
Entity EntityImpl::get(Decl *D, ProgramImpl &Prog) {
assert(D && "Passed null Decl");
return EntityGetter(Prog).Visit(D);
}
std::string EntityImpl::getPrintableName() {
return Id->getName();
}
//===----------------------------------------------------------------------===//
// Entity Implementation
//===----------------------------------------------------------------------===//
Entity::Entity(Decl *D) : Val(D->getCanonicalDecl()) { }
/// \brief Find the Decl that can be referred to by this entity.
Decl *Entity::getDecl(ASTContext &AST) const {
if (isInvalid())
return 0;
if (Decl *D = Val.dyn_cast<Decl *>())
// Check that the passed AST is actually the one that this Decl belongs to.
return (&D->getASTContext() == &AST) ? D : 0;
return Val.get<EntityImpl *>()->getDecl(AST);
}
std::string Entity::getPrintableName() const {
if (isInvalid())
return "<< Invalid >>";
if (Decl *D = Val.dyn_cast<Decl *>()) {
if (NamedDecl *ND = dyn_cast<NamedDecl>(D))
return ND->getNameAsString();
else
return std::string();
}
return Val.get<EntityImpl *>()->getPrintableName();
}
/// \brief Get an Entity associated with the given Decl.
/// \returns Null if an Entity cannot refer to this Decl.
Entity Entity::get(Decl *D, Program &Prog) {
if (D == 0)
return Entity();
ProgramImpl &ProgImpl = *static_cast<ProgramImpl*>(Prog.Impl);
return EntityImpl::get(D, ProgImpl);
}
unsigned
llvm::DenseMapInfo<Entity>::getHashValue(Entity E) {
return DenseMapInfo<void*>::getHashValue(E.getAsOpaquePtr());
}
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