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llvm/tools/llvm-dwp/llvm-dwp.cpp
David Blaikie 3bcdc18cae llvm-dwp: Include the dwo name (if available) when diagnosing duplicate CU IDs from dwp input files 
If you're building dwps from other dwps, it can be hard to track down a
duplicate CU ID if it comes from two compilations of the same file in
different modes, etc. By including the .dwo path (which is hopefully
more unique than the file path) it can help track down where the
duplicates came from.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@264520 91177308-0d34-0410-b5e6-96231b3b80d8
2016-03-26 20:32:14 +00:00

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//===-- llvm-dwp.cpp - Split DWARF merging tool for llvm ------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// A utility for merging DWARF 5 Split DWARF .dwo files into .dwp (DWARF
// package files).
//
//===----------------------------------------------------------------------===//
#include "llvm/ADT/MapVector.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/ADT/StringSet.h"
#include "llvm/CodeGen/AsmPrinter.h"
#include "llvm/DebugInfo/DWARF/DWARFFormValue.h"
#include "llvm/DebugInfo/DWARF/DWARFUnitIndex.h"
#include "llvm/MC/MCAsmInfo.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCInstrInfo.h"
#include "llvm/MC/MCObjectFileInfo.h"
#include "llvm/MC/MCRegisterInfo.h"
#include "llvm/MC/MCSectionELF.h"
#include "llvm/MC/MCStreamer.h"
#include "llvm/MC/MCTargetOptionsCommandFlags.h"
#include "llvm/Object/ObjectFile.h"
#include "llvm/Support/Compression.h"
#include "llvm/Support/DataExtractor.h"
#include "llvm/Support/FileSystem.h"
#include "llvm/Support/MathExtras.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/Options.h"
#include "llvm/Support/TargetRegistry.h"
#include "llvm/Support/TargetSelect.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/Target/TargetMachine.h"
#include <list>
#include <iostream>
#include <memory>
#include <system_error>
#include <unordered_set>
using namespace llvm;
using namespace llvm::object;
using namespace cl;
OptionCategory DwpCategory("Specific Options");
static list<std::string> InputFiles(Positional, OneOrMore,
desc("<input files>"), cat(DwpCategory));
static opt<std::string> OutputFilename(Required, "o",
desc("Specify the output file."),
value_desc("filename"),
cat(DwpCategory));
static int error(const Twine &Error, const Twine &Context) {
errs() << Twine("while processing ") + Context + ":\n";
errs() << Twine("error: ") + Error + "\n";
return 1;
}
static std::error_code
writeStringsAndOffsets(MCStreamer &Out, StringMap<uint32_t> &Strings,
uint32_t &StringOffset, MCSection *StrSection,
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 std::error_code();
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)) {
StringRef Str(s, LocalOffset - PrevOffset - 1);
auto Pair = Strings.insert(std::make_pair(Str, StringOffset));
if (Pair.second) {
Out.SwitchSection(StrSection);
Out.EmitBytes(
StringRef(Pair.first->getKeyData(), Pair.first->getKeyLength() + 1));
StringOffset += Str.size() + 1;
}
OffsetRemapping[PrevOffset] = Pair.first->second;
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);
}
return std::error_code();
}
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 const char *getIndexedString(uint32_t StrIndex, StringRef StrOffsets,
StringRef Str) {
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 CompileUnitIdentifiers getCUIdentifiers(StringRef Abbrev, StringRef Info,
StringRef StrOffsets,
StringRef Str) {
uint32_t Offset = 0;
DataExtractor InfoData(Info, true, 0);
InfoData.getU32(&Offset); // Length
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);
uint64_t Tag = AbbrevData.getULEB128(&AbbrevOffset);
(void)Tag;
// FIXME: Real error handling
assert(Tag == dwarf::DW_TAG_compile_unit);
// DW_CHILDREN
AbbrevData.getU8(&AbbrevOffset);
uint32_t Name;
uint32_t Form;
CompileUnitIdentifiers ID;
while ((Name = AbbrevData.getULEB128(&AbbrevOffset)) |
(Form = AbbrevData.getULEB128(&AbbrevOffset)) &&
(Name != 0 || Form != 0)) {
switch (Name) {
case dwarf::DW_AT_name: {
ID.Name = getIndexedString(InfoData.getULEB128(&Offset), StrOffsets, Str);
break;
}
case dwarf::DW_AT_GNU_dwo_name: {
ID.DWOName =
getIndexedString(InfoData.getULEB128(&Offset), StrOffsets, Str);
break;
}
case dwarf::DW_AT_GNU_dwo_id:
ID.Signature = InfoData.getU64(&Offset);
break;
default:
DWARFFormValue::skipValue(Form, InfoData, &Offset, Version, AddrSize);
}
}
return ID;
}
struct UnitIndexEntry {
DWARFUnitIndex::Entry::SectionContribution Contributions[8];
std::string Name;
std::string DWOName;
StringRef DWPName;
};
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, StringRef Types,
const UnitIndexEntry &CUEntry, uint32_t &TypesOffset) {
if (Types.empty())
return;
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;
while (Buckets[H]) {
assert(S != IndexEntries.begin()[Buckets[H] - 1].first &&
"Duplicate unit");
H = (H + (((S >> 32) & Mask) | 1)) % Buckets.size();
}
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);
}
static bool consumeCompressedDebugSectionHeader(StringRef &data,
uint64_t &OriginalSize) {
// Consume "ZLIB" prefix.
if (!data.startswith("ZLIB"))
return false;
data = data.substr(4);
// Consume uncompressed section size (big-endian 8 bytes).
DataExtractor extractor(data, false, 8);
uint32_t Offset = 0;
OriginalSize = extractor.getU64(&Offset);
if (Offset == 0)
return false;
data = data.substr(Offset);
return true;
}
void printDuplicateError(const std::pair<uint64_t, UnitIndexEntry> &PrevE,
const CompileUnitIdentifiers &ID, StringRef DWPName) {
errs() << "Duplicate DWO ID (" << PrevE.first << ") in '" << PrevE.second.Name
<< '\'';
if (!PrevE.second.DWPName.empty()) {
errs() << " (from ";
if (!PrevE.second.DWOName.empty())
errs() << '\'' << PrevE.second.DWOName << "' in ";
errs() << "'" << PrevE.second.DWPName.str() << "')";
}
errs() << " and '" << ID.Name << '\'';
if (!DWPName.empty()) {
errs() << " (from ";
if (*ID.DWOName)
errs() << '\'' << ID.DWOName << "\' in ";
errs() << '\'' << DWPName << "')";
}
errs() << '\n';
}
static std::error_code 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;
StringMap<uint32_t> Strings;
uint32_t StringOffset = 0;
uint32_t ContributionOffsets[8] = {};
for (const auto &Input : Inputs) {
auto ErrOrObj = object::ObjectFile::createObjectFile(Input);
if (!ErrOrObj)
return ErrOrObj.getError();
UnitIndexEntry CurEntry = {};
StringRef CurStrSection;
StringRef CurStrOffsetSection;
StringRef CurTypesSection;
StringRef InfoSection;
StringRef AbbrevSection;
StringRef CurCUIndexSection;
StringRef CurTUIndexSection;
SmallVector<SmallString<32>, 4> UncompressedSections;
for (const auto &Section : ErrOrObj->getBinary()->sections()) {
if (Section.isBSS())
continue;
if (Section.isVirtual())
continue;
StringRef Name;
if (std::error_code Err = Section.getName(Name))
return Err;
Name = Name.substr(Name.find_first_not_of("._"));
StringRef Contents;
if (auto Err = Section.getContents(Contents))
return Err;
if (Name.startswith("zdebug_")) {
uint64_t OriginalSize;
if (!zlib::isAvailable() ||
!consumeCompressedDebugSectionHeader(Contents, OriginalSize))
return make_error_code(std::errc::invalid_argument);
UncompressedSections.resize(UncompressedSections.size() + 1);
if (zlib::uncompress(Contents, UncompressedSections.back(), OriginalSize) !=
zlib::StatusOK) {
UncompressedSections.pop_back();
continue;
}
Name = Name.substr(1);
Contents = UncompressedSections.back();
}
auto SectionPair = KnownSections.find(Name);
if (SectionPair == KnownSections.end())
continue;
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 = Contents;
else if (OutSection == CUIndexSection)
CurCUIndexSection = Contents;
else if (OutSection == TUIndexSection)
CurTUIndexSection = Contents;
else {
Out.SwitchSection(OutSection);
Out.EmitBytes(Contents);
}
}
if (InfoSection.empty())
continue;
if (!CurCUIndexSection.empty()) {
DWARFUnitIndex CUIndex(DW_SECT_INFO);
DataExtractor CUIndexData(CurCUIndexSection,
ErrOrObj->getBinary()->isLittleEndian(), 0);
if (!CUIndex.parse(CUIndexData))
return make_error_code(std::errc::invalid_argument);
for (const DWARFUnitIndex::Entry &E : CUIndex.getRows()) {
auto *I = E.getOffsets();
if (!I)
continue;
auto P =
IndexEntries.insert(std::make_pair(E.getSignature(), CurEntry));
CompileUnitIdentifiers ID = getCUIdentifiers(
getSubsection(AbbrevSection, E, DW_SECT_ABBREV),
getSubsection(InfoSection, E, DW_SECT_INFO),
getSubsection(CurStrOffsetSection, E, DW_SECT_STR_OFFSETS),
CurStrSection);
if (!P.second) {
printDuplicateError(*P.first, ID, Input);
return make_error_code(std::errc::invalid_argument);
}
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 (CurTUIndexSection.empty())
return make_error_code(std::errc::invalid_argument);
DWARFUnitIndex TUIndex(DW_SECT_TYPES);
DataExtractor TUIndexData(CurTUIndexSection,
ErrOrObj->getBinary()->isLittleEndian(), 0);
if (!TUIndex.parse(TUIndexData))
return make_error_code(std::errc::invalid_argument);
addAllTypesFromDWP(Out, TypeIndexEntries, TUIndex, TypesSection,
CurTypesSection, CurEntry,
ContributionOffsets[DW_SECT_TYPES - DW_SECT_INFO]);
}
} else {
CompileUnitIdentifiers ID = getCUIdentifiers(
AbbrevSection, InfoSection, CurStrOffsetSection, CurStrSection);
auto P = IndexEntries.insert(std::make_pair(ID.Signature, CurEntry));
if (!P.second) {
printDuplicateError(*P.first, ID, "");
return make_error_code(std::errc::invalid_argument);
}
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]);
}
if (auto Err = writeStringsAndOffsets(Out, Strings, StringOffset,
StrSection, StrOffsetSection,
CurStrSection, CurStrOffsetSection))
return Err;
}
// 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 std::error_code();
}
int main(int argc, char **argv) {
ParseCommandLineOptions(argc, argv, "merge split dwarf (.dwo) files");
llvm::InitializeAllTargetInfos();
llvm::InitializeAllTargetMCs();
llvm::InitializeAllTargets();
llvm::InitializeAllAsmPrinters();
std::string ErrorStr;
StringRef Context = "dwarf streamer init";
Triple TheTriple("x86_64-linux-gnu");
// Get the target.
const Target *TheTarget =
TargetRegistry::lookupTarget("", TheTriple, ErrorStr);
if (!TheTarget)
return error(ErrorStr, Context);
std::string TripleName = TheTriple.getTriple();
// Create all the MC Objects.
std::unique_ptr<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, Reloc::Default, CodeModel::Default, MC);
auto MAB = TheTarget->createMCAsmBackend(*MRI, TripleName, "");
if (!MAB)
return error("no asm backend for target " + TripleName, Context);
std::unique_ptr<MCInstrInfo> MII(TheTarget->createMCInstrInfo());
if (!MII)
return error("no instr info info for target " + TripleName, Context);
std::unique_ptr<MCSubtargetInfo> MSTI(
TheTarget->createMCSubtargetInfo(TripleName, "", ""));
if (!MSTI)
return error("no subtarget info for target " + TripleName, Context);
MCCodeEmitter *MCE = TheTarget->createMCCodeEmitter(*MII, *MRI, MC);
if (!MCE)
return error("no code emitter for target " + TripleName, Context);
// Create the output file.
std::error_code EC;
raw_fd_ostream OutFile(OutputFilename, EC, sys::fs::F_None);
if (EC)
return error(Twine(OutputFilename) + ": " + EC.message(), Context);
MCTargetOptions MCOptions = InitMCTargetOptionsFromFlags();
std::unique_ptr<MCStreamer> MS(TheTarget->createMCObjectStreamer(
TheTriple, MC, *MAB, OutFile, MCE, *MSTI, MCOptions.MCRelaxAll,
MCOptions.MCIncrementalLinkerCompatible,
/*DWARFMustBeAtTheEnd*/ false));
if (!MS)
return error("no object streamer for target " + TripleName, Context);
if (auto Err = write(*MS, InputFiles))
return error(Err.message(), "Writing DWP file");
MS->Finish();
}
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