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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 "CXCursor.h"
#include "clang/AST/DeclVisitor.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/Support/raw_ostream.h"
//===----------------------------------------------------------------------===//
// USR generation.
//===----------------------------------------------------------------------===//
namespace {
class USRGenerator : public DeclVisitor<USRGenerator> {
llvm::raw_ostream &Out;
bool IgnoreResults;
public:
USRGenerator(llvm::raw_ostream &out) : Out(out), IgnoreResults(false) {}
bool ignoreResults() const { return IgnoreResults; }
void VisitBlockDecl(BlockDecl *D);
void VisitDeclContext(DeclContext *D);
void VisitFieldDecl(FieldDecl *D);
void VisitFunctionDecl(FunctionDecl *D);
void VisitNamedDecl(NamedDecl *D);
void VisitNamespaceDecl(NamespaceDecl *D);
void VisitObjCContainerDecl(ObjCContainerDecl *CD);
void VisitObjCMethodDecl(ObjCMethodDecl *MD);
void VisitObjCPropertyDecl(ObjCPropertyDecl *D);
void VisitTagDecl(TagDecl *D);
void VisitTypedefDecl(TypedefDecl *D);
};
} // end anonymous namespace
void USRGenerator::VisitBlockDecl(BlockDecl *D) {
VisitDeclContext(D->getDeclContext());
// FIXME: Better support for anonymous blocks.
Out << "@B^anon";
}
void USRGenerator::VisitDeclContext(DeclContext *DC) {
if (NamedDecl *D = dyn_cast<NamedDecl>(DC))
Visit(D);
}
void USRGenerator::VisitFieldDecl(FieldDecl *D) {
const std::string &s = D->getNameAsString();
if (s.empty()) {
// Bit fields can be anonymous.
IgnoreResults = true;
return;
}
VisitDeclContext(D->getDeclContext());
Out << "@^FI^" << s;
}
void USRGenerator::VisitFunctionDecl(FunctionDecl *D) {
VisitDeclContext(D->getDeclContext());
Out << "@F^" << D->getNameAsString();
}
void USRGenerator::VisitNamedDecl(NamedDecl *D) {
VisitDeclContext(D->getDeclContext());
const std::string &s = D->getNameAsString();
assert(!s.empty());
Out << "@^" << s;
}
void USRGenerator::VisitNamespaceDecl(NamespaceDecl *D) {
VisitDeclContext(D->getDeclContext());
Out << "@N^" << D->getNameAsString();
}
void USRGenerator::VisitObjCMethodDecl(ObjCMethodDecl *D) {
Visit(cast<Decl>(D->getDeclContext()));
Out << (D->isInstanceMethod() ? "(im)" : "(cm)");
Out << DeclarationName(D->getSelector()).getAsString();
}
void USRGenerator::VisitObjCContainerDecl(ObjCContainerDecl *D) {
switch (D->getKind()) {
default:
assert(false && "Invalid ObjC container.");
case Decl::ObjCInterface:
case Decl::ObjCImplementation:
Out << "objc(cs)" << D->getName();
break;
case Decl::ObjCCategory: {
ObjCCategoryDecl *CD = cast<ObjCCategoryDecl>(D);
Out << "objc(cy)" << CD->getClassInterface()->getName()
<< '^' << CD->getName();
break;
}
case Decl::ObjCCategoryImpl: {
ObjCCategoryImplDecl *CD = cast<ObjCCategoryImplDecl>(D);
Out << "objc(cy)" << CD->getClassInterface()->getName()
<< '^' << CD->getName();
break;
}
case Decl::ObjCProtocol:
Out << "objc(pl)" << cast<ObjCProtocolDecl>(D)->getName();
break;
}
}
void USRGenerator::VisitObjCPropertyDecl(ObjCPropertyDecl *D) {
Visit(cast<Decl>(D->getDeclContext()));
Out << "(py)" << D->getName();
}
void USRGenerator::VisitTagDecl(TagDecl *D) {
VisitDeclContext(D->getDeclContext());
switch (D->getTagKind()) {
case TagDecl::TK_struct: Out << "@S^"; break;
case TagDecl::TK_class: Out << "@C^"; break;
case TagDecl::TK_union: Out << "@U^"; break;
case TagDecl::TK_enum: Out << "@E^"; break;
}
// FIXME: Better support for anonymous structures and enums.
const std::string &s = D->getNameAsString();
if (s.empty()) {
if (TypedefDecl *TD = D->getTypedefForAnonDecl())
Out << "^anontd^" << TD->getNameAsString();
else
Out << "^anon";
}
else
Out << s;
}
void USRGenerator::VisitTypedefDecl(TypedefDecl *D) {
DeclContext *DC = D->getDeclContext();
if (NamedDecl *DCN = dyn_cast<NamedDecl>(DC))
Visit(DCN);
Out << "typedef@" << D->getName();
}
// FIXME: This is a skeleton implementation. It will be overhauled.
static CXString ConstructUSR(Decl *D) {
llvm::SmallString<1024> StrBuf;
{
llvm::raw_svector_ostream Out(StrBuf);
USRGenerator UG(Out);
UG.Visit(static_cast<Decl*>(D));
if (UG.ignoreResults())
return CIndexer::createCXString(NULL);
}
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);
}
extern "C" {
CXString clang_getCursorUSR(CXCursor C) {
if (Decl *D = cxcursor::getCursorDecl(C))
return ConstructUSR(D);
return CIndexer::createCXString(NULL);
}
} // end extern "C"
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