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//===- CTagsEmitter.cpp - Generate ctags-compatible index ------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This tablegen backend emits an index of definitions in ctags(1) format.
// A helper script, utils/TableGen/tdtags, provides an easier-to-use
// interface; run 'tdtags -H' for documentation.
//
//===----------------------------------------------------------------------===//
#define DEBUG_TYPE "ctags-emitter"
#include "llvm/Support/SourceMgr.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/TableGen/Error.h"
#include "llvm/TableGen/Record.h"
#include "llvm/TableGen/TableGenBackend.h"
#include <algorithm>
#include <string>
#include <vector>
using namespace llvm;
namespace llvm { extern SourceMgr SrcMgr; }
namespace {
class Tag {
private:
const std::string *Id;
SMLoc Loc;
public:
Tag(const std::string &Name, const SMLoc Location)
: Id(&Name), Loc(Location) {}
int operator<(const Tag &B) const { return *Id < *B.Id; }
void emit(raw_ostream &OS) const {
int BufferID = SrcMgr.FindBufferContainingLoc(Loc);
MemoryBuffer *CurMB = SrcMgr.getBufferInfo(BufferID).Buffer;
const char *BufferName = CurMB->getBufferIdentifier();
std::pair<unsigned, unsigned> LineAndColumn = SrcMgr.getLineAndColumn(Loc);
OS << *Id << "\t" << BufferName << "\t" << LineAndColumn.first << "\n";
}
};
class CTagsEmitter {
private:
RecordKeeper &Records;
public:
CTagsEmitter(RecordKeeper &R) : Records(R) {}
void run(raw_ostream &OS);
private:
static SMLoc locate(const Record *R);
};
} // End anonymous namespace.
SMLoc CTagsEmitter::locate(const Record *R) {
ArrayRef<SMLoc> Locs = R->getLoc();
if (Locs.empty()) {
SMLoc NullLoc;
return NullLoc;
}
return Locs.front();
}
void CTagsEmitter::run(raw_ostream &OS) {
const std::map<std::string, Record *> &Classes = Records.getClasses();
const std::map<std::string, Record *> &Defs = Records.getDefs();
std::vector<Tag> Tags;
// Collect tags.
Tags.reserve(Classes.size() + Defs.size());
for (std::map<std::string, Record *>::const_iterator I = Classes.begin(),
E = Classes.end();
I != E; ++I)
Tags.push_back(Tag(I->first, locate(I->second)));
for (std::map<std::string, Record *>::const_iterator I = Defs.begin(),
E = Defs.end();
I != E; ++I)
Tags.push_back(Tag(I->first, locate(I->second)));
// Emit tags.
std::sort(Tags.begin(), Tags.end());
OS << "!_TAG_FILE_FORMAT\t1\t/original ctags format/\n";
OS << "!_TAG_FILE_SORTED\t1\t/0=unsorted, 1=sorted, 2=foldcase/\n";
for (std::vector<Tag>::const_iterator I = Tags.begin(), E = Tags.end();
I != E; ++I)
I->emit(OS);
}
namespace llvm {
void EmitCTags(RecordKeeper &RK, raw_ostream &OS) { CTagsEmitter(RK).run(OS); }
} // End llvm namespace.
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