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//===- CIndexUSR.cpp - Clang-C Source Indexing Library --------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements the generation and use of USRs from CXEntities.
//
//===----------------------------------------------------------------------===//
#include "CIndexer.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/Support/raw_ostream.h";
#include "clang/AST/DeclVisitor.h";
extern "C" {
// Some notes on CXEntity:
//
// - Since the 'ordinary' namespace includes functions, data, typedefs,
// ObjC interfaces, thecurrent algorithm is a bit naive (resulting in one
// entity for 2 different types). For example:
//
// module1.m: @interface Foo @end Foo *x;
// module2.m: void Foo(int);
//
// - Since the unique name spans translation units, static data/functions
// within a CXTranslationUnit are *not* currently represented by entities.
// As a result, there will be no entity for the following:
//
// module.m: static void Foo() { }
//
static inline Entity GetEntity(const CXEntity &E) {
return Entity::getFromOpaquePtr(E.data);
}
static inline ASTUnit *GetTranslationUnit(CXTranslationUnit TU) {
return (ASTUnit*) TU;
}
static inline ASTContext &GetASTContext(CXTranslationUnit TU) {
return GetTranslationUnit(TU)->getASTContext();
}
static inline CXEntity NullCXEntity() {
CXEntity CE;
CE.index = NULL;
CE.data = NULL;
return CE;
}
static inline CXEntity MakeEntity(CXIndex CIdx, const Entity &E) {
CXEntity CE;
CE.index = CIdx;
CE.data = E.getAsOpaquePtr();
return CE;
}
static inline Program &GetProgram(CXIndex CIdx) {
return ((CIndexer*) CIdx)->getProgram();
}
/// clang_getDeclaration() maps from a CXEntity to the matching CXDecl (if any)
/// in a specified translation unit.
CXDecl clang_getDeclaration(CXEntity CE, CXTranslationUnit TU) {
return (CXDecl) GetEntity(CE).getDecl(GetASTContext(TU));
}
CXEntity clang_getEntityFromDecl(CXIndex CIdx, CXDecl CE) {
if (Decl *D = (Decl *) CE)
return MakeEntity(CIdx, Entity::get(D, GetProgram(CIdx)));
return NullCXEntity();
}
//===----------------------------------------------------------------------===//
// USR generation.
//===----------------------------------------------------------------------===//
namespace {
class USRGenerator : public DeclVisitor<USRGenerator> {
llvm::raw_ostream &Out;
public:
USRGenerator(llvm::raw_ostream &out) : Out(out) {}
void VisitObjCContainerDecl(ObjCContainerDecl *CD);
void VisitObjCMethodDecl(ObjCMethodDecl *MD);
void VisitObjCPropertyDecl(ObjCPropertyDecl *D);
};
} // end anonymous namespace
void USRGenerator::VisitObjCMethodDecl(ObjCMethodDecl *D) {
Visit(cast<Decl>(D->getDeclContext()));
Out << (D->isInstanceMethod() ? "_IM_" : "_CM_");
Out << DeclarationName(D->getSelector());
}
void USRGenerator::VisitObjCContainerDecl(ObjCContainerDecl *D) {
switch (D->getKind()) {
default:
assert(false && "Invalid ObjC container.");
case Decl::ObjCInterface:
case Decl::ObjCImplementation:
Out << "objc_class_" << D->getName();
break;
case Decl::ObjCCategory: {
ObjCCategoryDecl *CD = cast<ObjCCategoryDecl>(D);
Out << "objc_cat_" << CD->getClassInterface()->getName()
<< '_' << CD->getName();
break;
}
case Decl::ObjCCategoryImpl: {
ObjCCategoryImplDecl *CD = cast<ObjCCategoryImplDecl>(D);
Out << "objc_cat_" << CD->getClassInterface()->getName()
<< '_' << CD->getName();
break;
}
case Decl::ObjCProtocol:
Out << "objc_prot_" << cast<ObjCProtocolDecl>(D)->getName();
break;
}
}
void USRGenerator::VisitObjCPropertyDecl(ObjCPropertyDecl *D) {
Visit(cast<Decl>(D->getDeclContext()));
Out << "_prop_" << D->getName();
}
// FIXME: This is a skeleton implementation. It will be overhauled.
CXString clang_getUSR(CXEntity CE) {
const Entity &E = GetEntity(CE);
// FIXME: Support cross-translation unit CXEntities.
if (!E.isInternalToTU())
return CIndexer::createCXString(NULL);
Decl *D = E.getInternalDecl();
if (!D)
return CIndexer::createCXString(NULL);
llvm::SmallString<1024> StrBuf;
{
llvm::raw_svector_ostream Out(StrBuf);
USRGenerator UG(Out);
UG.Visit(D);
}
if (StrBuf.empty())
return CIndexer::createCXString(NULL);
// Return a copy of the string that must be disposed by the caller.
return CIndexer::createCXString(StrBuf.c_str(), true);
}
} // end extern "C"
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