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llvm-project/llvm/lib/DWP/DWP.cpp

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//===-- 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 "llvm/DWP/DWP.h"
#include "llvm/DWP/DWPError.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCObjectFileInfo.h"
#include "llvm/MC/MCTargetOptionsCommandFlags.h"
#include "llvm/Object/Decompressor.h"
#include "llvm/Object/ELFObjectFile.h"
#include "llvm/Support/MemoryBuffer.h"
#include <limits>
using namespace llvm;
using namespace llvm::object;
static mc::RegisterMCTargetOptionsFlags MCTargetOptionsFlags;
// Returns the size of debug_str_offsets section headers in bytes.
static uint64_t debugStrOffsetsHeaderSize(DataExtractor StrOffsetsData,
uint16_t DwarfVersion) {
if (DwarfVersion <= 4)
return 0; // There is no header before dwarf 5.
uint64_t Offset = 0;
uint64_t Length = StrOffsetsData.getU32(&Offset);
if (Length == llvm::dwarf::DW_LENGTH_DWARF64)
return 16; // unit length: 12 bytes, version: 2 bytes, padding: 2 bytes.
return 8; // unit length: 4 bytes, version: 2 bytes, padding: 2 bytes.
}
static uint64_t getCUAbbrev(StringRef Abbrev, uint64_t AbbrCode) {
uint64_t Offset = 0;
DataExtractor AbbrevData(Abbrev, true, 0);
while (AbbrevData.getULEB128(&Offset) != AbbrCode) {
// Tag
AbbrevData.getULEB128(&Offset);
// DW_CHILDREN
AbbrevData.getU8(&Offset);
// Attributes
while (AbbrevData.getULEB128(&Offset) | AbbrevData.getULEB128(&Offset))
;
}
return Offset;
}
static Expected<const char *>
getIndexedString(dwarf::Form Form, DataExtractor InfoData, uint64_t &InfoOffset,
StringRef StrOffsets, StringRef Str, uint16_t Version) {
if (Form == dwarf::DW_FORM_string)
return InfoData.getCStr(&InfoOffset);
uint64_t StrIndex;
switch (Form) {
case dwarf::DW_FORM_strx1:
StrIndex = InfoData.getU8(&InfoOffset);
break;
case dwarf::DW_FORM_strx2:
StrIndex = InfoData.getU16(&InfoOffset);
break;
case dwarf::DW_FORM_strx3:
StrIndex = InfoData.getU24(&InfoOffset);
break;
case dwarf::DW_FORM_strx4:
StrIndex = InfoData.getU32(&InfoOffset);
break;
case dwarf::DW_FORM_strx:
case dwarf::DW_FORM_GNU_str_index:
StrIndex = InfoData.getULEB128(&InfoOffset);
break;
default:
return make_error<DWPError>(
"string field must be encoded with one of the following: "
"DW_FORM_string, DW_FORM_strx, DW_FORM_strx1, DW_FORM_strx2, "
"DW_FORM_strx3, DW_FORM_strx4, or DW_FORM_GNU_str_index.");
}
DataExtractor StrOffsetsData(StrOffsets, true, 0);
uint64_t StrOffsetsOffset = 4 * StrIndex;
StrOffsetsOffset += debugStrOffsetsHeaderSize(StrOffsetsData, Version);
uint64_t StrOffset = StrOffsetsData.getU32(&StrOffsetsOffset);
DataExtractor StrData(Str, true, 0);
return StrData.getCStr(&StrOffset);
}
static Expected<CompileUnitIdentifiers>
getCUIdentifiers(InfoSectionUnitHeader &Header, StringRef Abbrev,
StringRef Info, StringRef StrOffsets, StringRef Str) {
DataExtractor InfoData(Info, true, 0);
uint64_t Offset = Header.HeaderSize;
if (Header.Version >= 5 && Header.UnitType != dwarf::DW_UT_split_compile)
return make_error<DWPError>(
std::string("unit type DW_UT_split_compile type not found in "
"debug_info header. Unexpected unit type 0x" +
utostr(Header.UnitType) + " found"));
CompileUnitIdentifiers ID;
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;
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, Header.Version);
if (!EName)
return EName.takeError();
ID.Name = *EName;
break;
}
case dwarf::DW_AT_GNU_dwo_name:
case dwarf::DW_AT_dwo_name: {
Expected<const char *> EName = getIndexedString(
Form, InfoData, Offset, StrOffsets, Str, Header.Version);
if (!EName)
return EName.takeError();
ID.DWOName = *EName;
break;
}
case dwarf::DW_AT_GNU_dwo_id:
Header.Signature = InfoData.getU64(&Offset);
break;
default:
DWARFFormValue::skipValue(
Form, InfoData, &Offset,
dwarf::FormParams({Header.Version, Header.AddrSize, Header.Format}));
}
}
if (!Header.Signature)
return make_error<DWPError>("compile unit missing dwo_id");
ID.Signature = *Header.Signature;
return ID;
}
static bool isSupportedSectionKind(DWARFSectionKind Kind) {
return Kind != DW_SECT_EXT_unknown;
}
namespace llvm {
// Convert an internal section identifier into the index to use with
// UnitIndexEntry::Contributions.
unsigned getContributionIndex(DWARFSectionKind Kind, uint32_t IndexVersion) {
assert(serializeSectionKind(Kind, IndexVersion) >= DW_SECT_INFO);
return serializeSectionKind(Kind, IndexVersion) - DW_SECT_INFO;
}
} // namespace llvm
// Convert a UnitIndexEntry::Contributions index to the corresponding on-disk
// value of the section identifier.
static unsigned getOnDiskSectionId(unsigned Index) {
return Index + DW_SECT_INFO;
}
static StringRef getSubsection(StringRef Section,
const DWARFUnitIndex::Entry &Entry,
DWARFSectionKind Kind) {
const auto *Off = Entry.getContribution(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, unsigned TypesContributionIndex) {
Out.switchSection(OutputTypes);
for (const DWARFUnitIndex::Entry &E : TUIndex.getRows()) {
auto *I = E.getContributions();
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()) {
if (!isSupportedSectionKind(Kind))
continue;
auto &C =
Entry.Contributions[getContributionIndex(Kind, TUIndex.getVersion())];
C.Offset += I->Offset;
C.Length = I->Length;
++I;
}
auto &C = Entry.Contributions[TypesContributionIndex];
Out.emitBytes(Types.substr(
C.Offset - TUEntry.Contributions[TypesContributionIndex].Offset,
C.Length));
C.Offset = TypesOffset;
TypesOffset += C.Length;
}
}
static void addAllTypesFromTypesSection(
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[getContributionIndex(DW_SECT_EXT_TYPES, 2)];
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 std::string buildDWODescription(StringRef Name, StringRef DWPName,
StringRef DWOName) {
std::string Text = "\'";
Text += Name;
Text += '\'';
bool HasDWO = !DWOName.empty();
bool HasDWP = !DWPName.empty();
if (HasDWO || HasDWP) {
Text += " (from ";
if (HasDWO) {
Text += '\'';
Text += DWOName;
Text += '\'';
}
if (HasDWO && HasDWP)
Text += " in ";
if (!DWPName.empty()) {
Text += '\'';
Text += DWPName;
Text += '\'';
}
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,
SectionRef Sec, StringRef Name, StringRef &Contents) {
auto *Obj = dyn_cast<ELFObjectFileBase>(Sec.getObject());
if (!Obj ||
!(static_cast<ELFSectionRef>(Sec).getFlags() & ELF::SHF_COMPRESSED))
return Error::success();
bool IsLE = isa<object::ELF32LEObjectFile>(Obj) ||
isa<object::ELF64LEObjectFile>(Obj);
bool Is64 = isa<object::ELF64LEObjectFile>(Obj) ||
isa<object::ELF64BEObjectFile>(Obj);
Expected<Decompressor> Dec = Decompressor::create(Name, Contents, IsLE, Is64);
if (!Dec)
return createError(Name, Dec.takeError());
UncompressedSections.emplace_back();
if (Error E = Dec->resizeAndDecompress(UncompressedSections.back()))
return createError(Name, std::move(E));
Contents = UncompressedSections.back();
return Error::success();
}
namespace llvm {
// Parse and return the header of an info section compile/type unit.
Expected<InfoSectionUnitHeader> parseInfoSectionUnitHeader(StringRef Info) {
InfoSectionUnitHeader Header;
Error Err = Error::success();
uint64_t Offset = 0;
DWARFDataExtractor InfoData(Info, true, 0);
std::tie(Header.Length, Header.Format) =
InfoData.getInitialLength(&Offset, &Err);
if (Err)
return make_error<DWPError>("cannot parse compile unit length: " +
llvm::toString(std::move(Err)));
if (!InfoData.isValidOffset(Offset + (Header.Length - 1))) {
return make_error<DWPError>(
"compile unit exceeds .debug_info section range: " +
utostr(Offset + Header.Length) + " >= " + utostr(InfoData.size()));
}
Header.Version = InfoData.getU16(&Offset, &Err);
if (Err)
return make_error<DWPError>("cannot parse compile unit version: " +
llvm::toString(std::move(Err)));
uint64_t MinHeaderLength;
if (Header.Version >= 5) {
// Size: Version (2), UnitType (1), AddrSize (1), DebugAbbrevOffset (4),
// Signature (8)
MinHeaderLength = 16;
} else {
// Size: Version (2), DebugAbbrevOffset (4), AddrSize (1)
MinHeaderLength = 7;
}
if (Header.Length < MinHeaderLength) {
return make_error<DWPError>("unit length is too small: expected at least " +
utostr(MinHeaderLength) + " got " +
utostr(Header.Length) + ".");
}
if (Header.Version >= 5) {
Header.UnitType = InfoData.getU8(&Offset);
Header.AddrSize = InfoData.getU8(&Offset);
Header.DebugAbbrevOffset = InfoData.getU32(&Offset);
Header.Signature = InfoData.getU64(&Offset);
if (Header.UnitType == dwarf::DW_UT_split_type) {
// Type offset.
MinHeaderLength += 4;
if (Header.Length < MinHeaderLength)
return make_error<DWPError>("type unit is missing type offset");
InfoData.getU32(&Offset);
}
} else {
// Note that, address_size and debug_abbrev_offset fields have switched
// places between dwarf version 4 and 5.
Header.DebugAbbrevOffset = InfoData.getU32(&Offset);
Header.AddrSize = InfoData.getU8(&Offset);
}
Header.HeaderSize = Offset;
return Header;
}
void writeStringsAndOffsets(MCStreamer &Out, DWPStringPool &Strings,
MCSection *StrOffsetSection,
StringRef CurStrSection,
StringRef CurStrOffsetSection, uint16_t Version) {
// 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 HeaderSize = debugStrOffsetsHeaderSize(Data, Version);
uint64_t Offset = 0;
uint64_t Size = CurStrOffsetSection.size();
// FIXME: This can be caused by bad input and should be handled as such.
assert(HeaderSize <= Size && "StrOffsetSection size is less than its header");
// Copy the header to the output.
Out.emitBytes(Data.getBytes(&Offset, HeaderSize));
while (Offset < Size) {
auto OldOffset = Data.getU32(&Offset);
auto NewOffset = OffsetRemapping[OldOffset];
Out.emitIntValue(NewOffset, 4);
}
}
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);
}
void writeIndex(MCStreamer &Out, MCSection *Section,
ArrayRef<unsigned> ContributionOffsets,
const MapVector<uint64_t, UnitIndexEntry> &IndexEntries,
uint32_t IndexVersion) {
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(IndexVersion, 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(getOnDiskSectionId(I), 4);
// Write the offsets.
writeIndexTable(Out, ContributionOffsets, IndexEntries,
&DWARFUnitIndex::Entry::SectionContribution::Offset);
// Write the lengths.
writeIndexTable(Out, ContributionOffsets, IndexEntries,
&DWARFUnitIndex::Entry::SectionContribution::Length);
}
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));
}
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 MCSection *InfoSection,
const SectionRef &Section, MCStreamer &Out,
std::deque<SmallString<32>> &UncompressedSections,
uint32_t (&ContributionOffsets)[8], UnitIndexEntry &CurEntry,
StringRef &CurStrSection, StringRef &CurStrOffsetSection,
std::vector<StringRef> &CurTypesSection,
std::vector<StringRef> &CurInfoSection, StringRef &AbbrevSection,
StringRef &CurCUIndexSection, StringRef &CurTUIndexSection,
std::vector<std::pair<DWARFSectionKind, uint32_t>> &SectionLength) {
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, Section, 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) {
if (Kind != DW_SECT_EXT_TYPES && Kind != DW_SECT_INFO) {
SectionLength.push_back(std::make_pair(Kind, Contents.size()));
}
if (Kind == DW_SECT_ABBREV) {
AbbrevSection = Contents;
}
}
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 if (OutSection == InfoSection)
CurInfoSection.push_back(Contents);
else {
Out.switchSection(OutSection);
Out.emitBytes(Contents);
}
return Error::success();
}
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();
MCSection *const InfoSection = MCOFI.getDwarfInfoDWOSection();
const StringMap<std::pair<MCSection *, DWARFSectionKind>> KnownSections = {
{"debug_info.dwo", {InfoSection, DW_SECT_INFO}},
{"debug_types.dwo", {MCOFI.getDwarfTypesDWOSection(), DW_SECT_EXT_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_EXT_LOC}},
{"debug_line.dwo", {MCOFI.getDwarfLineDWOSection(), DW_SECT_LINE}},
{"debug_macro.dwo", {MCOFI.getDwarfMacroDWOSection(), DW_SECT_MACRO}},
{"debug_abbrev.dwo", {MCOFI.getDwarfAbbrevDWOSection(), DW_SECT_ABBREV}},
{"debug_loclists.dwo",
{MCOFI.getDwarfLoclistsDWOSection(), DW_SECT_LOCLISTS}},
{"debug_rnglists.dwo",
{MCOFI.getDwarfRnglistsDWOSection(), DW_SECT_RNGLISTS}},
{"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] = {};
uint16_t Version = 0;
uint32_t IndexVersion = 0;
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;
std::vector<StringRef> CurInfoSection;
StringRef AbbrevSection;
StringRef CurCUIndexSection;
StringRef CurTUIndexSection;
// This maps each section contained in this file to its length.
// This information is later on used to calculate the contributions,
// i.e. offset and length, of each compile/type unit to a section.
std::vector<std::pair<DWARFSectionKind, uint32_t>> SectionLength;
for (const auto &Section : Obj.sections())
if (auto Err = handleSection(
KnownSections, StrSection, StrOffsetSection, TypesSection,
CUIndexSection, TUIndexSection, InfoSection, Section, Out,
UncompressedSections, ContributionOffsets, CurEntry,
CurStrSection, CurStrOffsetSection, CurTypesSection,
CurInfoSection, AbbrevSection, CurCUIndexSection,
CurTUIndexSection, SectionLength))
return Err;
if (CurInfoSection.empty())
continue;
Expected<InfoSectionUnitHeader> HeaderOrErr =
parseInfoSectionUnitHeader(CurInfoSection.front());
if (!HeaderOrErr)
return HeaderOrErr.takeError();
InfoSectionUnitHeader &Header = *HeaderOrErr;
if (Version == 0) {
Version = Header.Version;
IndexVersion = Version < 5 ? 2 : 5;
} else if (Version != Header.Version) {
return make_error<DWPError>("incompatible DWARF compile unit versions.");
}
writeStringsAndOffsets(Out, Strings, StrOffsetSection, CurStrSection,
CurStrOffsetSection, Header.Version);
for (auto Pair : SectionLength) {
auto Index = getContributionIndex(Pair.first, IndexVersion);
CurEntry.Contributions[Index].Offset = ContributionOffsets[Index];
ContributionOffsets[Index] +=
(CurEntry.Contributions[Index].Length = Pair.second);
}
uint32_t &InfoSectionOffset =
ContributionOffsets[getContributionIndex(DW_SECT_INFO, IndexVersion)];
if (CurCUIndexSection.empty()) {
bool FoundCUUnit = false;
Out.switchSection(InfoSection);
for (StringRef Info : CurInfoSection) {
uint64_t UnitOffset = 0;
while (Info.size() > UnitOffset) {
Expected<InfoSectionUnitHeader> HeaderOrError =
parseInfoSectionUnitHeader(Info.substr(UnitOffset, Info.size()));
if (!HeaderOrError)
return HeaderOrError.takeError();
InfoSectionUnitHeader &Header = *HeaderOrError;
UnitIndexEntry Entry = CurEntry;
auto &C = Entry.Contributions[getContributionIndex(DW_SECT_INFO,
IndexVersion)];
C.Offset = InfoSectionOffset;
C.Length = Header.Length + 4;
if (std::numeric_limits<uint32_t>::max() - InfoSectionOffset <
C.Length)
return make_error<DWPError>(
"debug information section offset is greater than 4GB");
UnitOffset += C.Length;
if (Header.Version < 5 ||
Header.UnitType == dwarf::DW_UT_split_compile) {
Expected<CompileUnitIdentifiers> EID =
getCUIdentifiers(Header, AbbrevSection,
Info.substr(UnitOffset - C.Length, C.Length),
CurStrOffsetSection, CurStrSection);
if (!EID)
return createFileError(Input, EID.takeError());
const auto &ID = *EID;
auto P = IndexEntries.insert(std::make_pair(ID.Signature, Entry));
if (!P.second)
return buildDuplicateError(*P.first, ID, "");
P.first->second.Name = ID.Name;
P.first->second.DWOName = ID.DWOName;
FoundCUUnit = true;
} else if (Header.UnitType == dwarf::DW_UT_split_type) {
auto P = TypeIndexEntries.insert(
std::make_pair(*Header.Signature, Entry));
if (!P.second)
continue;
}
Out.emitBytes(Info.substr(UnitOffset - C.Length, C.Length));
InfoSectionOffset += C.Length;
}
}
if (!FoundCUUnit)
return make_error<DWPError>("no compile unit found in file: " + Input);
if (IndexVersion == 2) {
// Add types from the .debug_types section from DWARF < 5.
addAllTypesFromTypesSection(
Out, TypeIndexEntries, TypesSection, CurTypesSection, CurEntry,
ContributionOffsets[getContributionIndex(DW_SECT_EXT_TYPES, 2)]);
}
continue;
}
if (CurInfoSection.size() != 1)
return make_error<DWPError>("expected exactly one occurrence of a debug "
"info section in a .dwp file");
StringRef DwpSingleInfoSection = CurInfoSection.front();
DWARFUnitIndex CUIndex(DW_SECT_INFO);
DataExtractor CUIndexData(CurCUIndexSection, Obj.isLittleEndian(), 0);
if (!CUIndex.parse(CUIndexData))
return make_error<DWPError>("failed to parse cu_index");
if (CUIndex.getVersion() != IndexVersion)
return make_error<DWPError>("incompatible cu_index versions, found " +
utostr(CUIndex.getVersion()) +
" and expecting " + utostr(IndexVersion));
Out.switchSection(InfoSection);
for (const DWARFUnitIndex::Entry &E : CUIndex.getRows()) {
auto *I = E.getContributions();
if (!I)
continue;
auto P = IndexEntries.insert(std::make_pair(E.getSignature(), CurEntry));
StringRef CUInfoSection =
getSubsection(DwpSingleInfoSection, E, DW_SECT_INFO);
Expected<InfoSectionUnitHeader> HeaderOrError =
parseInfoSectionUnitHeader(CUInfoSection);
if (!HeaderOrError)
return HeaderOrError.takeError();
InfoSectionUnitHeader &Header = *HeaderOrError;
Expected<CompileUnitIdentifiers> EID = getCUIdentifiers(
Header, getSubsection(AbbrevSection, E, DW_SECT_ABBREV),
CUInfoSection,
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()) {
if (!isSupportedSectionKind(Kind))
continue;
auto &C =
NewEntry.Contributions[getContributionIndex(Kind, IndexVersion)];
C.Offset += I->Offset;
C.Length = I->Length;
++I;
}
unsigned Index = getContributionIndex(DW_SECT_INFO, IndexVersion);
auto &C = NewEntry.Contributions[Index];
Out.emitBytes(CUInfoSection);
C.Offset = InfoSectionOffset;
InfoSectionOffset += C.Length;
}
if (!CurTUIndexSection.empty()) {
llvm::DWARFSectionKind TUSectionKind;
MCSection *OutSection;
StringRef TypeInputSection;
// Write type units into debug info section for DWARFv5.
if (Version >= 5) {
TUSectionKind = DW_SECT_INFO;
OutSection = InfoSection;
TypeInputSection = DwpSingleInfoSection;
} else {
// Write type units into debug types section for DWARF < 5.
if (CurTypesSection.size() != 1)
return make_error<DWPError>(
"multiple type unit sections in .dwp file");
TUSectionKind = DW_SECT_EXT_TYPES;
OutSection = TypesSection;
TypeInputSection = CurTypesSection.front();
}
DWARFUnitIndex TUIndex(TUSectionKind);
DataExtractor TUIndexData(CurTUIndexSection, Obj.isLittleEndian(), 0);
if (!TUIndex.parse(TUIndexData))
return make_error<DWPError>("failed to parse tu_index");
if (TUIndex.getVersion() != IndexVersion)
return make_error<DWPError>("incompatible tu_index versions, found " +
utostr(TUIndex.getVersion()) +
" and expecting " + utostr(IndexVersion));
unsigned TypesContributionIndex =
getContributionIndex(TUSectionKind, IndexVersion);
addAllTypesFromDWP(Out, TypeIndexEntries, TUIndex, OutSection,
TypeInputSection, CurEntry,
ContributionOffsets[TypesContributionIndex],
TypesContributionIndex);
}
}
if (Version < 5) {
// Lie about there being no info contributions so the TU index only includes
// the type unit contribution for DWARF < 5. In DWARFv5 the TU index has a
// contribution to the info section, so we do not want to lie about it.
ContributionOffsets[0] = 0;
}
writeIndex(Out, MCOFI.getDwarfTUIndexSection(), ContributionOffsets,
TypeIndexEntries, IndexVersion);
if (Version < 5) {
// Lie about the type contribution for DWARF < 5. In DWARFv5 the type
// section does not exist, so no need to do anything about this.
ContributionOffsets[getContributionIndex(DW_SECT_EXT_TYPES, 2)] = 0;
// Unlie about the info contribution
ContributionOffsets[0] = 1;
}
writeIndex(Out, MCOFI.getDwarfCUIndexSection(), ContributionOffsets,
IndexEntries, IndexVersion);
return Error::success();
}
} // namespace llvm
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