| //===-- llvm-dwp.cpp - Split DWARF merging tool for llvm ------------------===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // A utility for merging DWARF 5 Split DWARF .dwo files into .dwp (DWARF |
| // package files). |
| // |
| //===----------------------------------------------------------------------===// |
| #include "DWPError.h" |
| #include "DWPStringPool.h" |
| #include "llvm/ADT/MapVector.h" |
| #include "llvm/ADT/STLExtras.h" |
| #include "llvm/DebugInfo/DWARF/DWARFContext.h" |
| #include "llvm/DebugInfo/DWARF/DWARFFormValue.h" |
| #include "llvm/DebugInfo/DWARF/DWARFUnitIndex.h" |
| #include "llvm/MC/MCAsmBackend.h" |
| #include "llvm/MC/MCAsmInfo.h" |
| #include "llvm/MC/MCCodeEmitter.h" |
| #include "llvm/MC/MCContext.h" |
| #include "llvm/MC/MCInstrInfo.h" |
| #include "llvm/MC/MCObjectFileInfo.h" |
| #include "llvm/MC/MCObjectWriter.h" |
| #include "llvm/MC/MCRegisterInfo.h" |
| #include "llvm/MC/MCStreamer.h" |
| #include "llvm/MC/MCTargetOptionsCommandFlags.inc" |
| #include "llvm/Object/Decompressor.h" |
| #include "llvm/Object/ObjectFile.h" |
| #include "llvm/Support/DataExtractor.h" |
| #include "llvm/Support/Error.h" |
| #include "llvm/Support/FileSystem.h" |
| #include "llvm/Support/InitLLVM.h" |
| #include "llvm/Support/MathExtras.h" |
| #include "llvm/Support/MemoryBuffer.h" |
| #include "llvm/Support/Path.h" |
| #include "llvm/Support/TargetRegistry.h" |
| #include "llvm/Support/TargetSelect.h" |
| #include "llvm/Support/raw_ostream.h" |
| |
| using namespace llvm; |
| using namespace llvm::object; |
| |
| cl::OptionCategory DwpCategory("Specific Options"); |
| static cl::list<std::string> InputFiles(cl::Positional, cl::ZeroOrMore, |
| cl::desc("<input files>"), |
| cl::cat(DwpCategory)); |
| |
| static cl::list<std::string> ExecFilenames( |
| "e", cl::ZeroOrMore, |
| cl::desc("Specify the executable/library files to get the list of *.dwo from"), |
| cl::value_desc("filename"), cl::cat(DwpCategory)); |
| |
| static cl::opt<std::string> OutputFilename(cl::Required, "o", |
| cl::desc("Specify the output file."), |
| cl::value_desc("filename"), |
| cl::cat(DwpCategory)); |
| |
| static void writeStringsAndOffsets(MCStreamer &Out, DWPStringPool &Strings, |
| MCSection *StrOffsetSection, |
| StringRef CurStrSection, |
| StringRef CurStrOffsetSection) { |
| // Could possibly produce an error or warning if one of these was non-null but |
| // the other was null. |
| if (CurStrSection.empty() || CurStrOffsetSection.empty()) |
| return; |
| |
| DenseMap<uint32_t, uint32_t> OffsetRemapping; |
| |
| DataExtractor Data(CurStrSection, true, 0); |
| uint32_t LocalOffset = 0; |
| uint32_t PrevOffset = 0; |
| while (const char *s = Data.getCStr(&LocalOffset)) { |
| OffsetRemapping[PrevOffset] = |
| Strings.getOffset(s, LocalOffset - PrevOffset); |
| PrevOffset = LocalOffset; |
| } |
| |
| Data = DataExtractor(CurStrOffsetSection, true, 0); |
| |
| Out.SwitchSection(StrOffsetSection); |
| |
| uint32_t Offset = 0; |
| uint64_t Size = CurStrOffsetSection.size(); |
| while (Offset < Size) { |
| auto OldOffset = Data.getU32(&Offset); |
| auto NewOffset = OffsetRemapping[OldOffset]; |
| Out.EmitIntValue(NewOffset, 4); |
| } |
| } |
| |
| static uint32_t getCUAbbrev(StringRef Abbrev, uint64_t AbbrCode) { |
| uint64_t CurCode; |
| uint32_t Offset = 0; |
| DataExtractor AbbrevData(Abbrev, true, 0); |
| while ((CurCode = AbbrevData.getULEB128(&Offset)) != AbbrCode) { |
| // Tag |
| AbbrevData.getULEB128(&Offset); |
| // DW_CHILDREN |
| AbbrevData.getU8(&Offset); |
| // Attributes |
| while (AbbrevData.getULEB128(&Offset) | AbbrevData.getULEB128(&Offset)) |
| ; |
| } |
| return Offset; |
| } |
| |
| struct CompileUnitIdentifiers { |
| uint64_t Signature = 0; |
| const char *Name = ""; |
| const char *DWOName = ""; |
| }; |
| |
| static Expected<const char *> |
| getIndexedString(dwarf::Form Form, DataExtractor InfoData, |
| uint32_t &InfoOffset, StringRef StrOffsets, StringRef Str) { |
| if (Form == dwarf::DW_FORM_string) |
| return InfoData.getCStr(&InfoOffset); |
| if (Form != dwarf::DW_FORM_GNU_str_index) |
| return make_error<DWPError>( |
| "string field encoded without DW_FORM_string or DW_FORM_GNU_str_index"); |
| auto StrIndex = InfoData.getULEB128(&InfoOffset); |
| DataExtractor StrOffsetsData(StrOffsets, true, 0); |
| uint32_t StrOffsetsOffset = 4 * StrIndex; |
| uint32_t StrOffset = StrOffsetsData.getU32(&StrOffsetsOffset); |
| DataExtractor StrData(Str, true, 0); |
| return StrData.getCStr(&StrOffset); |
| } |
| |
| static Expected<CompileUnitIdentifiers> getCUIdentifiers(StringRef Abbrev, |
| StringRef Info, |
| StringRef StrOffsets, |
| StringRef Str) { |
| uint32_t Offset = 0; |
| DataExtractor InfoData(Info, true, 0); |
| dwarf::DwarfFormat Format = dwarf::DwarfFormat::DWARF32; |
| uint64_t Length = InfoData.getU32(&Offset); |
| // If the length is 0xffffffff, then this indictes that this is a DWARF 64 |
| // stream and the length is actually encoded into a 64 bit value that follows. |
| if (Length == 0xffffffffU) { |
| Format = dwarf::DwarfFormat::DWARF64; |
| Length = InfoData.getU64(&Offset); |
| } |
| uint16_t Version = InfoData.getU16(&Offset); |
| InfoData.getU32(&Offset); // Abbrev offset (should be zero) |
| uint8_t AddrSize = InfoData.getU8(&Offset); |
| |
| uint32_t AbbrCode = InfoData.getULEB128(&Offset); |
| |
| DataExtractor AbbrevData(Abbrev, true, 0); |
| uint32_t AbbrevOffset = getCUAbbrev(Abbrev, AbbrCode); |
| auto Tag = static_cast<dwarf::Tag>(AbbrevData.getULEB128(&AbbrevOffset)); |
| if (Tag != dwarf::DW_TAG_compile_unit) |
| return make_error<DWPError>("top level DIE is not a compile unit"); |
| // DW_CHILDREN |
| AbbrevData.getU8(&AbbrevOffset); |
| uint32_t Name; |
| dwarf::Form Form; |
| CompileUnitIdentifiers ID; |
| while ((Name = AbbrevData.getULEB128(&AbbrevOffset)) | |
| (Form = static_cast<dwarf::Form>(AbbrevData.getULEB128(&AbbrevOffset))) && |
| (Name != 0 || Form != 0)) { |
| switch (Name) { |
| case dwarf::DW_AT_name: { |
| Expected<const char *> EName = |
| getIndexedString(Form, InfoData, Offset, StrOffsets, Str); |
| if (!EName) |
| return EName.takeError(); |
| ID.Name = *EName; |
| break; |
| } |
| case dwarf::DW_AT_GNU_dwo_name: { |
| Expected<const char *> EName = |
| getIndexedString(Form, InfoData, Offset, StrOffsets, Str); |
| if (!EName) |
| return EName.takeError(); |
| ID.DWOName = *EName; |
| break; |
| } |
| case dwarf::DW_AT_GNU_dwo_id: |
| ID.Signature = InfoData.getU64(&Offset); |
| break; |
| default: |
| DWARFFormValue::skipValue(Form, InfoData, &Offset, |
| dwarf::FormParams({Version, AddrSize, Format})); |
| } |
| } |
| return ID; |
| } |
| |
| struct UnitIndexEntry { |
| DWARFUnitIndex::Entry::SectionContribution Contributions[8]; |
| std::string Name; |
| std::string DWOName; |
| StringRef DWPName; |
| }; |
| |
| static StringRef getSubsection(StringRef Section, |
| const DWARFUnitIndex::Entry &Entry, |
| DWARFSectionKind Kind) { |
| const auto *Off = Entry.getOffset(Kind); |
| if (!Off) |
| return StringRef(); |
| return Section.substr(Off->Offset, Off->Length); |
| } |
| |
| static void addAllTypesFromDWP( |
| MCStreamer &Out, MapVector<uint64_t, UnitIndexEntry> &TypeIndexEntries, |
| const DWARFUnitIndex &TUIndex, MCSection *OutputTypes, StringRef Types, |
| const UnitIndexEntry &TUEntry, uint32_t &TypesOffset) { |
| Out.SwitchSection(OutputTypes); |
| for (const DWARFUnitIndex::Entry &E : TUIndex.getRows()) { |
| auto *I = E.getOffsets(); |
| if (!I) |
| continue; |
| auto P = TypeIndexEntries.insert(std::make_pair(E.getSignature(), TUEntry)); |
| if (!P.second) |
| continue; |
| auto &Entry = P.first->second; |
| // Zero out the debug_info contribution |
| Entry.Contributions[0] = {}; |
| for (auto Kind : TUIndex.getColumnKinds()) { |
| auto &C = Entry.Contributions[Kind - DW_SECT_INFO]; |
| C.Offset += I->Offset; |
| C.Length = I->Length; |
| ++I; |
| } |
| auto &C = Entry.Contributions[DW_SECT_TYPES - DW_SECT_INFO]; |
| Out.EmitBytes(Types.substr( |
| C.Offset - TUEntry.Contributions[DW_SECT_TYPES - DW_SECT_INFO].Offset, |
| C.Length)); |
| C.Offset = TypesOffset; |
| TypesOffset += C.Length; |
| } |
| } |
| |
| static void addAllTypes(MCStreamer &Out, |
| MapVector<uint64_t, UnitIndexEntry> &TypeIndexEntries, |
| MCSection *OutputTypes, |
| const std::vector<StringRef> &TypesSections, |
| const UnitIndexEntry &CUEntry, uint32_t &TypesOffset) { |
| for (StringRef Types : TypesSections) { |
| Out.SwitchSection(OutputTypes); |
| uint32_t Offset = 0; |
| DataExtractor Data(Types, true, 0); |
| while (Data.isValidOffset(Offset)) { |
| UnitIndexEntry Entry = CUEntry; |
| // Zero out the debug_info contribution |
| Entry.Contributions[0] = {}; |
| auto &C = Entry.Contributions[DW_SECT_TYPES - DW_SECT_INFO]; |
| C.Offset = TypesOffset; |
| auto PrevOffset = Offset; |
| // Length of the unit, including the 4 byte length field. |
| C.Length = Data.getU32(&Offset) + 4; |
| |
| Data.getU16(&Offset); // Version |
| Data.getU32(&Offset); // Abbrev offset |
| Data.getU8(&Offset); // Address size |
| auto Signature = Data.getU64(&Offset); |
| Offset = PrevOffset + C.Length; |
| |
| auto P = TypeIndexEntries.insert(std::make_pair(Signature, Entry)); |
| if (!P.second) |
| continue; |
| |
| Out.EmitBytes(Types.substr(PrevOffset, C.Length)); |
| TypesOffset += C.Length; |
| } |
| } |
| } |
| |
| static void |
| writeIndexTable(MCStreamer &Out, ArrayRef<unsigned> ContributionOffsets, |
| const MapVector<uint64_t, UnitIndexEntry> &IndexEntries, |
| uint32_t DWARFUnitIndex::Entry::SectionContribution::*Field) { |
| for (const auto &E : IndexEntries) |
| for (size_t i = 0; i != array_lengthof(E.second.Contributions); ++i) |
| if (ContributionOffsets[i]) |
| Out.EmitIntValue(E.second.Contributions[i].*Field, 4); |
| } |
| |
| static void |
| writeIndex(MCStreamer &Out, MCSection *Section, |
| ArrayRef<unsigned> ContributionOffsets, |
| const MapVector<uint64_t, UnitIndexEntry> &IndexEntries) { |
| if (IndexEntries.empty()) |
| return; |
| |
| unsigned Columns = 0; |
| for (auto &C : ContributionOffsets) |
| if (C) |
| ++Columns; |
| |
| std::vector<unsigned> Buckets(NextPowerOf2(3 * IndexEntries.size() / 2)); |
| uint64_t Mask = Buckets.size() - 1; |
| size_t i = 0; |
| for (const auto &P : IndexEntries) { |
| auto S = P.first; |
| auto H = S & Mask; |
| auto HP = ((S >> 32) & Mask) | 1; |
| while (Buckets[H]) { |
| assert(S != IndexEntries.begin()[Buckets[H] - 1].first && |
| "Duplicate unit"); |
| H = (H + HP) & Mask; |
| } |
| Buckets[H] = i + 1; |
| ++i; |
| } |
| |
| Out.SwitchSection(Section); |
| Out.EmitIntValue(2, 4); // Version |
| Out.EmitIntValue(Columns, 4); // Columns |
| Out.EmitIntValue(IndexEntries.size(), 4); // Num Units |
| Out.EmitIntValue(Buckets.size(), 4); // Num Buckets |
| |
| // Write the signatures. |
| for (const auto &I : Buckets) |
| Out.EmitIntValue(I ? IndexEntries.begin()[I - 1].first : 0, 8); |
| |
| // Write the indexes. |
| for (const auto &I : Buckets) |
| Out.EmitIntValue(I, 4); |
| |
| // Write the column headers (which sections will appear in the table) |
| for (size_t i = 0; i != ContributionOffsets.size(); ++i) |
| if (ContributionOffsets[i]) |
| Out.EmitIntValue(i + DW_SECT_INFO, 4); |
| |
| // Write the offsets. |
| writeIndexTable(Out, ContributionOffsets, IndexEntries, |
| &DWARFUnitIndex::Entry::SectionContribution::Offset); |
| |
| // Write the lengths. |
| writeIndexTable(Out, ContributionOffsets, IndexEntries, |
| &DWARFUnitIndex::Entry::SectionContribution::Length); |
| } |
| |
| std::string buildDWODescription(StringRef Name, StringRef DWPName, StringRef DWOName) { |
| std::string Text = "\'"; |
| Text += Name; |
| Text += '\''; |
| if (!DWPName.empty()) { |
| Text += " (from "; |
| if (!DWOName.empty()) { |
| Text += '\''; |
| Text += DWOName; |
| Text += "' in "; |
| } |
| Text += '\''; |
| Text += DWPName; |
| Text += "')"; |
| } |
| return Text; |
| } |
| |
| static Error createError(StringRef Name, Error E) { |
| return make_error<DWPError>( |
| ("failure while decompressing compressed section: '" + Name + "', " + |
| llvm::toString(std::move(E))) |
| .str()); |
| } |
| |
| static Error |
| handleCompressedSection(std::deque<SmallString<32>> &UncompressedSections, |
| StringRef &Name, StringRef &Contents) { |
| if (!Decompressor::isGnuStyle(Name)) |
| return Error::success(); |
| |
| Expected<Decompressor> Dec = |
| Decompressor::create(Name, Contents, false /*IsLE*/, false /*Is64Bit*/); |
| if (!Dec) |
| return createError(Name, Dec.takeError()); |
| |
| UncompressedSections.emplace_back(); |
| if (Error E = Dec->resizeAndDecompress(UncompressedSections.back())) |
| return createError(Name, std::move(E)); |
| |
| Name = Name.substr(2); // Drop ".z" |
| Contents = UncompressedSections.back(); |
| return Error::success(); |
| } |
| |
| static Error handleSection( |
| const StringMap<std::pair<MCSection *, DWARFSectionKind>> &KnownSections, |
| const MCSection *StrSection, const MCSection *StrOffsetSection, |
| const MCSection *TypesSection, const MCSection *CUIndexSection, |
| const MCSection *TUIndexSection, const SectionRef &Section, MCStreamer &Out, |
| std::deque<SmallString<32>> &UncompressedSections, |
| uint32_t (&ContributionOffsets)[8], UnitIndexEntry &CurEntry, |
| StringRef &CurStrSection, StringRef &CurStrOffsetSection, |
| std::vector<StringRef> &CurTypesSection, StringRef &InfoSection, |
| StringRef &AbbrevSection, StringRef &CurCUIndexSection, |
| StringRef &CurTUIndexSection) { |
| if (Section.isBSS()) |
| return Error::success(); |
| |
| if (Section.isVirtual()) |
| return Error::success(); |
| |
| StringRef Name; |
| if (std::error_code Err = Section.getName(Name)) |
| return errorCodeToError(Err); |
| |
| StringRef Contents; |
| if (auto Err = Section.getContents(Contents)) |
| return errorCodeToError(Err); |
| |
| if (auto Err = handleCompressedSection(UncompressedSections, Name, Contents)) |
| return Err; |
| |
| Name = Name.substr(Name.find_first_not_of("._")); |
| |
| auto SectionPair = KnownSections.find(Name); |
| if (SectionPair == KnownSections.end()) |
| return Error::success(); |
| |
| if (DWARFSectionKind Kind = SectionPair->second.second) { |
| auto Index = Kind - DW_SECT_INFO; |
| if (Kind != DW_SECT_TYPES) { |
| CurEntry.Contributions[Index].Offset = ContributionOffsets[Index]; |
| ContributionOffsets[Index] += |
| (CurEntry.Contributions[Index].Length = Contents.size()); |
| } |
| |
| switch (Kind) { |
| case DW_SECT_INFO: |
| InfoSection = Contents; |
| break; |
| case DW_SECT_ABBREV: |
| AbbrevSection = Contents; |
| break; |
| default: |
| break; |
| } |
| } |
| |
| MCSection *OutSection = SectionPair->second.first; |
| if (OutSection == StrOffsetSection) |
| CurStrOffsetSection = Contents; |
| else if (OutSection == StrSection) |
| CurStrSection = Contents; |
| else if (OutSection == TypesSection) |
| CurTypesSection.push_back(Contents); |
| else if (OutSection == CUIndexSection) |
| CurCUIndexSection = Contents; |
| else if (OutSection == TUIndexSection) |
| CurTUIndexSection = Contents; |
| else { |
| Out.SwitchSection(OutSection); |
| Out.EmitBytes(Contents); |
| } |
| return Error::success(); |
| } |
| |
| static Error |
| buildDuplicateError(const std::pair<uint64_t, UnitIndexEntry> &PrevE, |
| const CompileUnitIdentifiers &ID, StringRef DWPName) { |
| return make_error<DWPError>( |
| std::string("Duplicate DWO ID (") + utohexstr(PrevE.first) + ") in " + |
| buildDWODescription(PrevE.second.Name, PrevE.second.DWPName, |
| PrevE.second.DWOName) + |
| " and " + buildDWODescription(ID.Name, DWPName, ID.DWOName)); |
| } |
| |
| static Expected<SmallVector<std::string, 16>> |
| getDWOFilenames(StringRef ExecFilename) { |
| auto ErrOrObj = object::ObjectFile::createObjectFile(ExecFilename); |
| if (!ErrOrObj) |
| return ErrOrObj.takeError(); |
| |
| const ObjectFile &Obj = *ErrOrObj.get().getBinary(); |
| std::unique_ptr<DWARFContext> DWARFCtx = DWARFContext::create(Obj); |
| |
| SmallVector<std::string, 16> DWOPaths; |
| for (const auto &CU : DWARFCtx->compile_units()) { |
| const DWARFDie &Die = CU->getUnitDIE(); |
| std::string DWOName = dwarf::toString( |
| Die.find({dwarf::DW_AT_dwo_name, dwarf::DW_AT_GNU_dwo_name}), ""); |
| if (DWOName.empty()) |
| continue; |
| std::string DWOCompDir = |
| dwarf::toString(Die.find(dwarf::DW_AT_comp_dir), ""); |
| if (!DWOCompDir.empty()) { |
| SmallString<16> DWOPath; |
| sys::path::append(DWOPath, DWOCompDir, DWOName); |
| DWOPaths.emplace_back(DWOPath.data(), DWOPath.size()); |
| } else { |
| DWOPaths.push_back(std::move(DWOName)); |
| } |
| } |
| return std::move(DWOPaths); |
| } |
| |
| static Error write(MCStreamer &Out, ArrayRef<std::string> Inputs) { |
| const auto &MCOFI = *Out.getContext().getObjectFileInfo(); |
| MCSection *const StrSection = MCOFI.getDwarfStrDWOSection(); |
| MCSection *const StrOffsetSection = MCOFI.getDwarfStrOffDWOSection(); |
| MCSection *const TypesSection = MCOFI.getDwarfTypesDWOSection(); |
| MCSection *const CUIndexSection = MCOFI.getDwarfCUIndexSection(); |
| MCSection *const TUIndexSection = MCOFI.getDwarfTUIndexSection(); |
| const StringMap<std::pair<MCSection *, DWARFSectionKind>> KnownSections = { |
| {"debug_info.dwo", {MCOFI.getDwarfInfoDWOSection(), DW_SECT_INFO}}, |
| {"debug_types.dwo", {MCOFI.getDwarfTypesDWOSection(), DW_SECT_TYPES}}, |
| {"debug_str_offsets.dwo", {StrOffsetSection, DW_SECT_STR_OFFSETS}}, |
| {"debug_str.dwo", {StrSection, static_cast<DWARFSectionKind>(0)}}, |
| {"debug_loc.dwo", {MCOFI.getDwarfLocDWOSection(), DW_SECT_LOC}}, |
| {"debug_line.dwo", {MCOFI.getDwarfLineDWOSection(), DW_SECT_LINE}}, |
| {"debug_abbrev.dwo", {MCOFI.getDwarfAbbrevDWOSection(), DW_SECT_ABBREV}}, |
| {"debug_cu_index", {CUIndexSection, static_cast<DWARFSectionKind>(0)}}, |
| {"debug_tu_index", {TUIndexSection, static_cast<DWARFSectionKind>(0)}}}; |
| |
| MapVector<uint64_t, UnitIndexEntry> IndexEntries; |
| MapVector<uint64_t, UnitIndexEntry> TypeIndexEntries; |
| |
| uint32_t ContributionOffsets[8] = {}; |
| |
| DWPStringPool Strings(Out, StrSection); |
| |
| SmallVector<OwningBinary<object::ObjectFile>, 128> Objects; |
| Objects.reserve(Inputs.size()); |
| |
| std::deque<SmallString<32>> UncompressedSections; |
| |
| for (const auto &Input : Inputs) { |
| auto ErrOrObj = object::ObjectFile::createObjectFile(Input); |
| if (!ErrOrObj) |
| return ErrOrObj.takeError(); |
| |
| auto &Obj = *ErrOrObj->getBinary(); |
| Objects.push_back(std::move(*ErrOrObj)); |
| |
| UnitIndexEntry CurEntry = {}; |
| |
| StringRef CurStrSection; |
| StringRef CurStrOffsetSection; |
| std::vector<StringRef> CurTypesSection; |
| StringRef InfoSection; |
| StringRef AbbrevSection; |
| StringRef CurCUIndexSection; |
| StringRef CurTUIndexSection; |
| |
| for (const auto &Section : Obj.sections()) |
| if (auto Err = handleSection( |
| KnownSections, StrSection, StrOffsetSection, TypesSection, |
| CUIndexSection, TUIndexSection, Section, Out, |
| UncompressedSections, ContributionOffsets, CurEntry, |
| CurStrSection, CurStrOffsetSection, CurTypesSection, InfoSection, |
| AbbrevSection, CurCUIndexSection, CurTUIndexSection)) |
| return Err; |
| |
| if (InfoSection.empty()) |
| continue; |
| |
| writeStringsAndOffsets(Out, Strings, StrOffsetSection, CurStrSection, |
| CurStrOffsetSection); |
| |
| if (CurCUIndexSection.empty()) { |
| Expected<CompileUnitIdentifiers> EID = getCUIdentifiers( |
| AbbrevSection, InfoSection, CurStrOffsetSection, CurStrSection); |
| if (!EID) |
| return EID.takeError(); |
| const auto &ID = *EID; |
| auto P = IndexEntries.insert(std::make_pair(ID.Signature, CurEntry)); |
| if (!P.second) |
| return buildDuplicateError(*P.first, ID, ""); |
| P.first->second.Name = ID.Name; |
| P.first->second.DWOName = ID.DWOName; |
| addAllTypes(Out, TypeIndexEntries, TypesSection, CurTypesSection, |
| CurEntry, ContributionOffsets[DW_SECT_TYPES - DW_SECT_INFO]); |
| continue; |
| } |
| |
| DWARFUnitIndex CUIndex(DW_SECT_INFO); |
| DataExtractor CUIndexData(CurCUIndexSection, Obj.isLittleEndian(), 0); |
| if (!CUIndex.parse(CUIndexData)) |
| return make_error<DWPError>("Failed to parse cu_index"); |
| |
| for (const DWARFUnitIndex::Entry &E : CUIndex.getRows()) { |
| auto *I = E.getOffsets(); |
| if (!I) |
| continue; |
| auto P = IndexEntries.insert(std::make_pair(E.getSignature(), CurEntry)); |
| Expected<CompileUnitIdentifiers> EID = getCUIdentifiers( |
| getSubsection(AbbrevSection, E, DW_SECT_ABBREV), |
| getSubsection(InfoSection, E, DW_SECT_INFO), |
| getSubsection(CurStrOffsetSection, E, DW_SECT_STR_OFFSETS), |
| CurStrSection); |
| if (!EID) |
| return EID.takeError(); |
| const auto &ID = *EID; |
| if (!P.second) |
| return buildDuplicateError(*P.first, ID, Input); |
| auto &NewEntry = P.first->second; |
| NewEntry.Name = ID.Name; |
| NewEntry.DWOName = ID.DWOName; |
| NewEntry.DWPName = Input; |
| for (auto Kind : CUIndex.getColumnKinds()) { |
| auto &C = NewEntry.Contributions[Kind - DW_SECT_INFO]; |
| C.Offset += I->Offset; |
| C.Length = I->Length; |
| ++I; |
| } |
| } |
| |
| if (!CurTypesSection.empty()) { |
| if (CurTypesSection.size() != 1) |
| return make_error<DWPError>("multiple type unit sections in .dwp file"); |
| DWARFUnitIndex TUIndex(DW_SECT_TYPES); |
| DataExtractor TUIndexData(CurTUIndexSection, Obj.isLittleEndian(), 0); |
| if (!TUIndex.parse(TUIndexData)) |
| return make_error<DWPError>("Failed to parse tu_index"); |
| addAllTypesFromDWP(Out, TypeIndexEntries, TUIndex, TypesSection, |
| CurTypesSection.front(), CurEntry, |
| ContributionOffsets[DW_SECT_TYPES - DW_SECT_INFO]); |
| } |
| } |
| |
| // Lie about there being no info contributions so the TU index only includes |
| // the type unit contribution |
| ContributionOffsets[0] = 0; |
| writeIndex(Out, MCOFI.getDwarfTUIndexSection(), ContributionOffsets, |
| TypeIndexEntries); |
| |
| // Lie about the type contribution |
| ContributionOffsets[DW_SECT_TYPES - DW_SECT_INFO] = 0; |
| // Unlie about the info contribution |
| ContributionOffsets[0] = 1; |
| |
| writeIndex(Out, MCOFI.getDwarfCUIndexSection(), ContributionOffsets, |
| IndexEntries); |
| |
| return Error::success(); |
| } |
| |
| static int error(const Twine &Error, const Twine &Context) { |
| errs() << Twine("while processing ") + Context + ":\n"; |
| errs() << Twine("error: ") + Error + "\n"; |
| return 1; |
| } |
| |
| int main(int argc, char **argv) { |
| InitLLVM X(argc, argv); |
| |
| cl::ParseCommandLineOptions(argc, argv, "merge split dwarf (.dwo) files\n"); |
| |
| 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, /*PIC*/ false, MC); |
| |
| std::unique_ptr<MCSubtargetInfo> MSTI( |
| TheTarget->createMCSubtargetInfo(TripleName, "", "")); |
| if (!MSTI) |
| return error("no subtarget info for target " + TripleName, Context); |
| |
| MCTargetOptions Options; |
| auto MAB = TheTarget->createMCAsmBackend(*MSTI, *MRI, Options); |
| 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); |
| |
| 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); |
| Optional<buffer_ostream> BOS; |
| raw_pwrite_stream *OS; |
| if (EC) |
| return error(Twine(OutputFilename) + ": " + EC.message(), Context); |
| if (OutFile.supportsSeeking()) { |
| OS = &OutFile; |
| } else { |
| BOS.emplace(OutFile); |
| OS = BOS.getPointer(); |
| } |
| |
| MCTargetOptions MCOptions = InitMCTargetOptionsFromFlags(); |
| std::unique_ptr<MCStreamer> MS(TheTarget->createMCObjectStreamer( |
| TheTriple, MC, std::unique_ptr<MCAsmBackend>(MAB), |
| MAB->createObjectWriter(*OS), std::unique_ptr<MCCodeEmitter>(MCE), |
| *MSTI, MCOptions.MCRelaxAll, MCOptions.MCIncrementalLinkerCompatible, |
| /*DWARFMustBeAtTheEnd*/ false)); |
| if (!MS) |
| return error("no object streamer for target " + TripleName, Context); |
| |
| std::vector<std::string> DWOFilenames = InputFiles; |
| for (const auto &ExecFilename : ExecFilenames) { |
| auto DWOs = getDWOFilenames(ExecFilename); |
| if (!DWOs) { |
| logAllUnhandledErrors(DWOs.takeError(), errs(), "error: "); |
| return 1; |
| } |
| DWOFilenames.insert(DWOFilenames.end(), |
| std::make_move_iterator(DWOs->begin()), |
| std::make_move_iterator(DWOs->end())); |
| } |
| |
| if (auto Err = write(*MS, DWOFilenames)) { |
| logAllUnhandledErrors(std::move(Err), errs(), "error: "); |
| return 1; |
| } |
| |
| MS->Finish(); |
| } |
