forked from OSchip/llvm-project
269 lines
9.0 KiB
C++
269 lines
9.0 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/DataExtractor.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 "llvm/DebugInfo/DWARF/DWARFUnitIndex.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 llvm::object;
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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
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writeStringsAndOffsets(MCStreamer &Out, StringMap<uint32_t> &Strings,
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uint32_t &StringOffset, MCSection *StrSection,
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MCSection *StrOffsetSection, StringRef CurStrSection,
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StringRef CurStrOffsetSection) {
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// Could possibly produce an error or warning if one of these was non-null but
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// the other was null.
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if (CurStrSection.empty() || CurStrOffsetSection.empty())
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return std::error_code();
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DenseMap<uint32_t, uint32_t> OffsetRemapping;
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DataExtractor Data(CurStrSection, true, 0);
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uint32_t LocalOffset = 0;
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uint32_t PrevOffset = 0;
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while (const char *s = Data.getCStr(&LocalOffset)) {
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StringRef Str(s, LocalOffset - PrevOffset - 1);
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auto Pair = Strings.insert(std::make_pair(Str, StringOffset));
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if (Pair.second) {
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Out.SwitchSection(StrSection);
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Out.EmitBytes(
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StringRef(Pair.first->getKeyData(), Pair.first->getKeyLength() + 1));
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StringOffset += Str.size() + 1;
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}
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OffsetRemapping[PrevOffset] = Pair.first->second;
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PrevOffset = LocalOffset;
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}
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Data = DataExtractor(CurStrOffsetSection, true, 0);
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Out.SwitchSection(StrOffsetSection);
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uint32_t Offset = 0;
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uint64_t Size = CurStrOffsetSection.size();
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while (Offset < Size) {
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auto OldOffset = Data.getU32(&Offset);
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auto NewOffset = OffsetRemapping[OldOffset];
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Out.EmitIntValue(NewOffset, 4);
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}
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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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const auto &MCOFI = *Out.getContext().getObjectFileInfo();
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MCSection *const StrSection = MCOFI.getDwarfStrDWOSection();
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MCSection *const StrOffsetSection = MCOFI.getDwarfStrOffDWOSection();
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const StringMap<std::pair<MCSection *, DWARFSectionKind>> KnownSections = {
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{"debug_info.dwo", {MCOFI.getDwarfInfoDWOSection(), DW_SECT_INFO}},
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{"debug_types.dwo", {MCOFI.getDwarfTypesDWOSection(), DW_SECT_TYPES}},
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{"debug_str_offsets.dwo", {StrOffsetSection, DW_SECT_STR_OFFSETS}},
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{"debug_str.dwo", {StrSection, static_cast<DWARFSectionKind>(0)}},
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{"debug_loc.dwo", {MCOFI.getDwarfLocDWOSection(), DW_SECT_LOC}},
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{"debug_abbrev.dwo", {MCOFI.getDwarfAbbrevDWOSection(), DW_SECT_ABBREV}}};
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struct UnitIndexEntry {
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uint64_t Signature;
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DWARFUnitIndex::Entry::SectionContribution Contributions[8];
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};
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std::vector<UnitIndexEntry> IndexEntries;
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StringMap<uint32_t> Strings;
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uint32_t StringOffset = 0;
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uint64_t UnitIndex = 0;
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uint32_t ContributionOffsets[8] = {};
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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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IndexEntries.emplace_back();
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UnitIndexEntry &CurEntry = IndexEntries.back();
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CurEntry.Signature = UnitIndex++;
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StringRef CurStrSection;
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StringRef CurStrOffsetSection;
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for (const auto &Section : ErrOrObj->getBinary()->sections()) {
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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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auto SectionPair =
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KnownSections.find(Name.substr(Name.find_first_not_of("._")));
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if (SectionPair == KnownSections.end())
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continue;
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StringRef Contents;
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if (auto Err = Section.getContents(Contents))
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return Err;
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if (DWARFSectionKind Kind = SectionPair->second.second) {
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auto Index = Kind - DW_SECT_INFO;
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CurEntry.Contributions[Index].Offset = ContributionOffsets[Index];
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ContributionOffsets[Index] +=
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(CurEntry.Contributions[Index].Length = Contents.size());
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}
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MCSection *OutSection = SectionPair->second.first;
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if (OutSection == StrOffsetSection)
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CurStrOffsetSection = Contents;
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else if (OutSection == StrSection)
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CurStrSection = Contents;
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else {
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Out.SwitchSection(OutSection);
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Out.EmitBytes(Contents);
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}
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}
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if (auto Err = writeStringsAndOffsets(Out, Strings, StringOffset,
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StrSection, StrOffsetSection,
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CurStrSection, CurStrOffsetSection))
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return Err;
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}
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unsigned Columns = 0;
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for (auto &C : ContributionOffsets)
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if (C)
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++Columns;
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Out.SwitchSection(MCOFI.getDwarfCUIndexSection());
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Out.EmitIntValue(2, 4); // Version
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Out.EmitIntValue(Columns, 4); // Columns
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Out.EmitIntValue(IndexEntries.size(), 4); // Num Units
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// FIXME: This is not the right number of buckets for a real hash.
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Out.EmitIntValue(IndexEntries.size(), 4); // Num Buckets
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// Write the signatures.
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for (const auto &E : IndexEntries)
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Out.EmitIntValue(E.Signature, 8);
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// Write the indexes.
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for (size_t i = 0; i != IndexEntries.size(); ++i)
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Out.EmitIntValue(i + 1, 4);
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// Write the column headers (which sections will appear in the table)
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for (size_t i = 0; i != array_lengthof(ContributionOffsets); ++i)
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if (ContributionOffsets[i])
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Out.EmitIntValue(i + DW_SECT_INFO, 4);
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// Write the offsets.
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for (const auto &E : IndexEntries)
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for (size_t i = 0; i != array_lengthof(E.Contributions); ++i)
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if (ContributionOffsets[i])
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Out.EmitIntValue(E.Contributions[i].Offset, 4);
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// Write the lengths.
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for (const auto &E : IndexEntries)
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for (size_t i = 0; i != array_lengthof(E.Contributions); ++i)
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if (ContributionOffsets[i])
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Out.EmitIntValue(E.Contributions[i].Length, 4);
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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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