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