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#include "llvm/ADT/STLExtras.h"
#include "llvm/ADT/StringSet.h"
#include "llvm/CodeGen/AsmPrinter.h"
#include "llvm/MC/MCAsmInfo.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCInstrInfo.h"
#include "llvm/MC/MCObjectFileInfo.h"
#include "llvm/MC/MCRegisterInfo.h"
#include "llvm/MC/MCSectionELF.h"
#include "llvm/MC/MCStreamer.h"
#include "llvm/Object/ObjectFile.h"
#include "llvm/Support/Options.h"
#include "llvm/Support/FileSystem.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/TargetRegistry.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/Target/TargetMachine.h"
#include "llvm/Support/TargetSelect.h"
#include <memory>
#include <list>
#include <unordered_set>
using namespace llvm;
using namespace cl;
OptionCategory DwpCategory("Specific Options");
static list<std::string> InputFiles(Positional, OneOrMore,
desc("<input files>"), cat(DwpCategory));
static opt<std::string> OutputFilename(Required, "o", desc("Specify the output file."),
value_desc("filename"), cat(DwpCategory));
static int error(const Twine &Error, const Twine &Context) {
errs() << Twine("while processing ") + Context + ":\n";
errs() << Twine("error: ") + Error + "\n";
return 1;
}
static std::error_code writeSection(MCStreamer &Out, MCSection *OutSection,
const object::SectionRef &Sym) {
StringRef Contents;
if (auto Err = Sym.getContents(Contents))
return Err;
Out.SwitchSection(OutSection);
Out.EmitBytes(Contents);
return std::error_code();
}
static std::error_code write(MCStreamer &Out, ArrayRef<std::string> Inputs) {
for (const auto &Input : Inputs) {
auto ErrOrObj = object::ObjectFile::createObjectFile(Input);
if (!ErrOrObj)
return ErrOrObj.getError();
const auto *Obj = ErrOrObj->getBinary();
for (const auto &Section : Obj->sections()) {
const auto &MCOFI = *Out.getContext().getObjectFileInfo();
static const StringMap<MCSection *> KnownSections = {
{"debug_info.dwo", MCOFI.getDwarfInfoDWOSection()},
{"debug_types.dwo", MCOFI.getDwarfTypesDWOSection()},
{"debug_str_offsets.dwo", MCOFI.getDwarfStrOffDWOSection()},
{"debug_str.dwo", MCOFI.getDwarfStrDWOSection()},
{"debug_loc.dwo", MCOFI.getDwarfLocDWOSection()},
{"debug_abbrev.dwo", MCOFI.getDwarfAbbrevDWOSection()}};
StringRef Name;
if (std::error_code Err = Section.getName(Name))
return Err;
if (MCSection *OutSection =
KnownSections.lookup(Name.substr(Name.find_first_not_of("._"))))
if (auto Err = writeSection(Out, OutSection, Section))
return Err;
}
}
return std::error_code();
}
int main(int argc, char** argv) {
ParseCommandLineOptions(argc, argv, "merge split dwarf (.dwo) files");
llvm::InitializeAllTargetInfos();
llvm::InitializeAllTargetMCs();
llvm::InitializeAllTargets();
llvm::InitializeAllAsmPrinters();
std::string ErrorStr;
StringRef Context = "dwarf streamer init";
Triple TheTriple("x86_64-linux-gnu");
// Get the target.
const Target *TheTarget =
TargetRegistry::lookupTarget("", TheTriple, ErrorStr);
if (!TheTarget)
return error(ErrorStr, Context);
std::string TripleName = TheTriple.getTriple();
// Create all the MC Objects.
std::unique_ptr<MCRegisterInfo> MRI(TheTarget->createMCRegInfo(TripleName));
if (!MRI)
return error(Twine("no register info for target ") + TripleName, Context);
std::unique_ptr<MCAsmInfo> MAI(TheTarget->createMCAsmInfo(*MRI, TripleName));
if (!MAI)
return error("no asm info for target " + TripleName, Context);
MCObjectFileInfo MOFI;
MCContext MC(MAI.get(), MRI.get(), &MOFI);
MOFI.InitMCObjectFileInfo(TheTriple, Reloc::Default, CodeModel::Default,
MC);
auto MAB = TheTarget->createMCAsmBackend(*MRI, TripleName, "");
if (!MAB)
return error("no asm backend for target " + TripleName, Context);
std::unique_ptr<MCInstrInfo> MII(TheTarget->createMCInstrInfo());
if (!MII)
return error("no instr info info for target " + TripleName, Context);
std::unique_ptr<MCSubtargetInfo> MSTI(
TheTarget->createMCSubtargetInfo(TripleName, "", ""));
if (!MSTI)
return error("no subtarget info for target " + TripleName, Context);
MCCodeEmitter *MCE = TheTarget->createMCCodeEmitter(*MII, *MRI, MC);
if (!MCE)
return error("no code emitter for target " + TripleName, Context);
// Create the output file.
std::error_code EC;
raw_fd_ostream OutFile(OutputFilename, EC, sys::fs::F_None);
if (EC)
return error(Twine(OutputFilename) + ": " + EC.message(), Context);
std::unique_ptr<MCStreamer> MS(TheTarget->createMCObjectStreamer(
TheTriple, MC, *MAB, OutFile, MCE, *MSTI, false,
/*DWARFMustBeAtTheEnd*/ false));
if (!MS)
return error("no object streamer for target " + TripleName, Context);
if (auto Err = write(*MS, InputFiles))
return error(Err.message(), "Writing DWP file");
MS->Finish();
}
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