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-rw-r--r--llvm/tools/llvm-dwp/llvm-dwp.cpp749
1 files changed, 749 insertions, 0 deletions
diff --git a/llvm/tools/llvm-dwp/llvm-dwp.cpp b/llvm/tools/llvm-dwp/llvm-dwp.cpp
new file mode 100644
index 000000000000..23513ef8fb4e
--- /dev/null
+++ b/llvm/tools/llvm-dwp/llvm-dwp.cpp
@@ -0,0 +1,749 @@
+//===-- 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/Optional.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/ToolOutputFile.h"
+#include "llvm/Support/WithColor.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<uint64_t, uint32_t> OffsetRemapping;
+
+ DataExtractor Data(CurStrSection, true, 0);
+ uint64_t LocalOffset = 0;
+ uint64_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);
+
+ uint64_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 uint64_t getCUAbbrev(StringRef Abbrev, uint64_t AbbrCode) {
+ uint64_t CurCode;
+ uint64_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,
+ uint64_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);
+ uint64_t StrOffsetsOffset = 4 * StrIndex;
+ uint64_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) {
+ uint64_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);
+ uint64_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;
+ Optional<uint64_t> Signature = None;
+ 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:
+ Signature = InfoData.getU64(&Offset);
+ break;
+ default:
+ DWARFFormValue::skipValue(Form, InfoData, &Offset,
+ dwarf::FormParams({Version, AddrSize, Format}));
+ }
+ }
+ if (!Signature)
+ return make_error<DWPError>("compile unit missing dwo_id");
+ ID.Signature = *Signature;
+ 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);
+ uint64_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();
+
+ Expected<StringRef> NameOrErr = Section.getName();
+ if (!NameOrErr)
+ return NameOrErr.takeError();
+ StringRef Name = *NameOrErr;
+
+ Expected<StringRef> ContentsOrErr = Section.getContents();
+ if (!ContentsOrErr)
+ return ContentsOrErr.takeError();
+ StringRef Contents = *ContentsOrErr;
+
+ 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 createFileError(Input, 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 createFileError(Input, 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);
+
+ MCTargetOptions MCOptions = InitMCTargetOptionsFromFlags();
+ std::unique_ptr<MCAsmInfo> MAI(
+ TheTarget->createMCAsmInfo(*MRI, TripleName, MCOptions));
+ 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;
+ ToolOutputFile OutFile(OutputFilename, EC, sys::fs::OF_None);
+ Optional<buffer_ostream> BOS;
+ raw_pwrite_stream *OS;
+ if (EC)
+ return error(Twine(OutputFilename) + ": " + EC.message(), Context);
+ if (OutFile.os().supportsSeeking()) {
+ OS = &OutFile.os();
+ } else {
+ BOS.emplace(OutFile.os());
+ OS = BOS.getPointer();
+ }
+
+ 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(), WithColor::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), WithColor::error());
+ return 1;
+ }
+
+ MS->Finish();
+ OutFile.keep();
+ return 0;
+}