llvm-project/clang/lib/Index/Entity.cpp

271 lines
8.4 KiB
C++

//===--- 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/Index/GlobalSelector.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> {
Program &Prog;
ProgramImpl &ProgImpl;
public:
EntityGetter(Program &prog, ProgramImpl &progImpl)
: Prog(prog), ProgImpl(progImpl) { }
// Get an Entity.
Entity getEntity(Entity Parent, DeclarationName Name,
unsigned IdNS, bool isObjCInstanceMethod);
// Get an Entity associated with the name in the global namespace.
Entity getGlobalEntity(llvm::StringRef Name);
Entity VisitNamedDecl(NamedDecl *D);
Entity VisitVarDecl(VarDecl *D);
Entity VisitFieldDecl(FieldDecl *D);
Entity VisitFunctionDecl(FunctionDecl *D);
Entity VisitTypeDecl(TypeDecl *D);
};
}
}
Entity EntityGetter::getEntity(Entity Parent, DeclarationName Name,
unsigned IdNS, bool isObjCInstanceMethod) {
llvm::FoldingSetNodeID ID;
EntityImpl::Profile(ID, Parent, Name, IdNS, isObjCInstanceMethod);
ProgramImpl::EntitySetTy &Entities = ProgImpl.getEntities();
void *InsertPos = 0;
if (EntityImpl *Ent = Entities.FindNodeOrInsertPos(ID, InsertPos))
return Entity(Ent);
void *Buf = ProgImpl.Allocate(sizeof(EntityImpl));
EntityImpl *New =
new (Buf) EntityImpl(Parent, Name, IdNS, isObjCInstanceMethod);
Entities.InsertNode(New, InsertPos);
return Entity(New);
}
Entity EntityGetter::getGlobalEntity(llvm::StringRef Name) {
IdentifierInfo *II = &ProgImpl.getIdents().get(Name);
DeclarationName GlobName(II);
unsigned IdNS = Decl::IDNS_Ordinary;
return getEntity(Entity(), GlobName, IdNS, false);
}
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 and selectors.
// Treats other DeclarationNames as internal Decls for now..
DeclarationName LocalName = D->getDeclName();
if (!LocalName)
return Entity(D);
DeclarationName GlobName;
if (IdentifierInfo *II = LocalName.getAsIdentifierInfo()) {
IdentifierInfo *GlobII = &ProgImpl.getIdents().get(II->getName());
GlobName = DeclarationName(GlobII);
} else {
Selector LocalSel = LocalName.getObjCSelector();
// Treats other DeclarationNames as internal Decls for now..
if (LocalSel.isNull())
return Entity(D);
Selector GlobSel =
(uintptr_t)GlobalSelector::get(LocalSel, Prog).getAsOpaquePtr();
GlobName = DeclarationName(GlobSel);
}
assert(GlobName);
unsigned IdNS = D->getIdentifierNamespace();
ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(D);
bool isObjCInstanceMethod = MD && MD->isInstanceMethod();
return getEntity(Parent, GlobName, IdNS, isObjCInstanceMethod);
}
Entity EntityGetter::VisitVarDecl(VarDecl *D) {
// Local variables have no linkage, make invalid Entities.
if (D->hasLocalStorage())
return Entity();
// If it's static it cannot be referred to by another translation unit.
if (D->getStorageClass() == SC_Static)
return Entity(D);
return VisitNamedDecl(D);
}
Entity EntityGetter::VisitFunctionDecl(FunctionDecl *D) {
// If it's static it cannot be referred to by another translation unit.
if (D->getStorageClass() == SC_Static)
return Entity(D);
return VisitNamedDecl(D);
}
Entity EntityGetter::VisitFieldDecl(FieldDecl *D) {
// Make FieldDecl an invalid Entity since it has no linkage.
return Entity();
}
Entity EntityGetter::VisitTypeDecl(TypeDecl *D) {
// Although in C++ class name has external linkage, usually the definition of
// the class is available in the same translation unit when it's needed. So we
// make all of them invalid Entity.
return Entity();
}
//===----------------------------------------------------------------------===//
// 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.
DeclarationName LocalName;
if (IdentifierInfo *GlobII = Name.getAsIdentifierInfo()) {
IdentifierInfo &II = AST.Idents.get(GlobII->getName());
LocalName = DeclarationName(&II);
} else {
Selector GlobSel = Name.getObjCSelector();
assert(!GlobSel.isNull() && "A not handled yet declaration name");
GlobalSelector GSel =
GlobalSelector::getFromOpaquePtr(GlobSel.getAsOpaquePtr());
LocalName = GSel.getSelector(AST);
}
assert(LocalName);
DeclContext::lookup_result Res = DC->lookup(LocalName);
for (DeclContext::lookup_iterator I = Res.first, E = Res.second; I!=E; ++I) {
Decl *D = *I;
if (D->getIdentifierNamespace() == IdNS) {
if (ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(D)) {
if (MD->isInstanceMethod() == IsObjCInstanceMethod)
return MD;
} else
return D;
}
}
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, Program &Prog, ProgramImpl &ProgImpl) {
assert(D && "Passed null Decl");
return EntityGetter(Prog, ProgImpl).Visit(D);
}
/// \brief Get an Entity associated with a global name.
Entity EntityImpl::get(llvm::StringRef Name, Program &Prog,
ProgramImpl &ProgImpl) {
return EntityGetter(Prog, ProgImpl).getGlobalEntity(Name);
}
std::string EntityImpl::getPrintableName() {
return Name.getAsString();
}
//===----------------------------------------------------------------------===//
// 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, Prog, ProgImpl);
}
Entity Entity::get(llvm::StringRef Name, Program &Prog) {
ProgramImpl &ProgImpl = *static_cast<ProgramImpl*>(Prog.Impl);
return EntityImpl::get(Name, Prog, ProgImpl);
}
unsigned
llvm::DenseMapInfo<Entity>::getHashValue(Entity E) {
return DenseMapInfo<void*>::getHashValue(E.getAsOpaquePtr());
}