From 242b948817a0dc6456d7f9711b152608aa39f603 Mon Sep 17 00:00:00 2001 From: David Blaikie Date: Tue, 1 Dec 2015 00:48:39 +0000 Subject: [llvm-dwp] Initial partial prototype This just concatenates the common DWP sections without doing any of the fancy DWP things like: 1) update str_offsets 2) deduplicating strings 3) merging/creating cu/tu_index Patches for these will follow shortly. (also not sure about target triple/object file type for this tool - do I really need a whole triple just to write an object file that contains purely static/hardcoded bytes in each section? & I guess I should just pick it based on the first input, maybe, rather than hardcoding for now - but we only produce .dwo on ELF platforms with objcopy for now anyway) llvm-svn: 254355 --- llvm/tools/llvm-dwp/llvm-dwp.cpp | 144 ++++++++++++++++++++++++++++++++++++++- 1 file changed, 143 insertions(+), 1 deletion(-) (limited to 'llvm/tools/llvm-dwp/llvm-dwp.cpp') diff --git a/llvm/tools/llvm-dwp/llvm-dwp.cpp b/llvm/tools/llvm-dwp/llvm-dwp.cpp index b2f997621be..7f9f6678db0 100644 --- a/llvm/tools/llvm-dwp/llvm-dwp.cpp +++ b/llvm/tools/llvm-dwp/llvm-dwp.cpp @@ -1,2 +1,144 @@ -int main() { +#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 +#include +#include + +using namespace llvm; +using namespace cl; + +OptionCategory DwpCategory("Specific Options"); +static list InputFiles(Positional, OneOrMore, + desc(""), cat(DwpCategory)); + +static opt 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 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 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 MRI(TheTarget->createMCRegInfo(TripleName)); + if (!MRI) + return error(Twine("no register info for target ") + TripleName, Context); + + std::unique_ptr 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 MII(TheTarget->createMCInstrInfo()); + if (!MII) + return error("no instr info info for target " + TripleName, Context); + + std::unique_ptr 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 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(); } -- cgit v1.2.3