forked from WebAssembly/binaryen
/
DWARFContext.cpp
1883 lines (1678 loc) · 68.6 KB
/
DWARFContext.cpp
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//===- DWARFContext.cpp ---------------------------------------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//
#include "llvm/DebugInfo/DWARF/DWARFContext.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/ADT/StringSwitch.h"
#include "llvm/BinaryFormat/Dwarf.h"
#include "llvm/DebugInfo/DWARF/DWARFAcceleratorTable.h"
#include "llvm/DebugInfo/DWARF/DWARFCompileUnit.h"
#include "llvm/DebugInfo/DWARF/DWARFDebugAbbrev.h"
#include "llvm/DebugInfo/DWARF/DWARFDebugAddr.h"
#include "llvm/DebugInfo/DWARF/DWARFDebugArangeSet.h"
#include "llvm/DebugInfo/DWARF/DWARFDebugAranges.h"
#include "llvm/DebugInfo/DWARF/DWARFDebugFrame.h"
#include "llvm/DebugInfo/DWARF/DWARFDebugLine.h"
#include "llvm/DebugInfo/DWARF/DWARFDebugLoc.h"
#include "llvm/DebugInfo/DWARF/DWARFDebugMacro.h"
#include "llvm/DebugInfo/DWARF/DWARFDebugPubTable.h"
#include "llvm/DebugInfo/DWARF/DWARFDebugRangeList.h"
#include "llvm/DebugInfo/DWARF/DWARFDebugRnglists.h"
#include "llvm/DebugInfo/DWARF/DWARFDie.h"
#include "llvm/DebugInfo/DWARF/DWARFFormValue.h"
#include "llvm/DebugInfo/DWARF/DWARFGdbIndex.h"
#include "llvm/DebugInfo/DWARF/DWARFSection.h"
#include "llvm/DebugInfo/DWARF/DWARFUnitIndex.h"
#include "llvm/DebugInfo/DWARF/DWARFVerifier.h"
#include "llvm/MC/MCRegisterInfo.h"
#include "llvm/Object/Decompressor.h"
#include "llvm/Object/MachO.h"
#include "llvm/Object/ObjectFile.h"
#include "llvm/Object/RelocationResolver.h"
#include "llvm/Support/Casting.h"
#include "llvm/Support/DataExtractor.h"
#include "llvm/Support/Error.h"
#include "llvm/Support/Format.h"
#include "llvm/Support/LEB128.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/Path.h"
#include "llvm/Support/TargetRegistry.h"
#include "llvm/Support/WithColor.h"
#include "llvm/Support/raw_ostream.h"
#include <algorithm>
#include <cstdint>
#include <deque>
#include <map>
#include <string>
#include <utility>
#include <vector>
using namespace llvm;
using namespace dwarf;
using namespace object;
#define DEBUG_TYPE "dwarf"
using DWARFLineTable = DWARFDebugLine::LineTable;
using FileLineInfoKind = DILineInfoSpecifier::FileLineInfoKind;
using FunctionNameKind = DILineInfoSpecifier::FunctionNameKind;
DWARFContext::DWARFContext(std::unique_ptr<const DWARFObject> DObj,
std::string DWPName)
: DIContext(CK_DWARF), DWPName(std::move(DWPName)), DObj(std::move(DObj)) {}
DWARFContext::~DWARFContext() = default;
/// Dump the UUID load command.
static void dumpUUID(raw_ostream &OS, const ObjectFile &Obj) {
#if 0 // XXX BINARYEN
auto *MachO = dyn_cast<MachOObjectFile>(&Obj);
if (!MachO)
return;
for (auto LC : MachO->load_commands()) {
raw_ostream::uuid_t UUID;
if (LC.C.cmd == MachO::LC_UUID) {
if (LC.C.cmdsize < sizeof(UUID) + sizeof(LC.C)) {
OS << "error: UUID load command is too short.\n";
return;
}
OS << "UUID: ";
memcpy(&UUID, LC.Ptr+sizeof(LC.C), sizeof(UUID));
OS.write_uuid(UUID);
Triple T = MachO->getArchTriple();
OS << " (" << T.getArchName() << ')';
OS << ' ' << MachO->getFileName() << '\n';
}
}
#endif
}
using ContributionCollection =
std::vector<Optional<StrOffsetsContributionDescriptor>>;
// Collect all the contributions to the string offsets table from all units,
// sort them by their starting offsets and remove duplicates.
static ContributionCollection
collectContributionData(DWARFContext::unit_iterator_range Units) {
ContributionCollection Contributions;
for (const auto &U : Units)
if (const auto &C = U->getStringOffsetsTableContribution())
Contributions.push_back(C);
// Sort the contributions so that any invalid ones are placed at
// the start of the contributions vector. This way they are reported
// first.
llvm::sort(Contributions,
[](const Optional<StrOffsetsContributionDescriptor> &L,
const Optional<StrOffsetsContributionDescriptor> &R) {
if (L && R)
return L->Base < R->Base;
return R.hasValue();
});
// Uniquify contributions, as it is possible that units (specifically
// type units in dwo or dwp files) share contributions. We don't want
// to report them more than once.
Contributions.erase(
std::unique(Contributions.begin(), Contributions.end(),
[](const Optional<StrOffsetsContributionDescriptor> &L,
const Optional<StrOffsetsContributionDescriptor> &R) {
if (L && R)
return L->Base == R->Base && L->Size == R->Size;
return false;
}),
Contributions.end());
return Contributions;
}
static void dumpDWARFv5StringOffsetsSection(
raw_ostream &OS, StringRef SectionName, const DWARFObject &Obj,
const DWARFSection &StringOffsetsSection, StringRef StringSection,
DWARFContext::unit_iterator_range Units, bool LittleEndian) {
auto Contributions = collectContributionData(Units);
DWARFDataExtractor StrOffsetExt(Obj, StringOffsetsSection, LittleEndian, 0);
DataExtractor StrData(StringSection, LittleEndian, 0);
uint64_t SectionSize = StringOffsetsSection.Data.size();
uint64_t Offset = 0;
for (auto &Contribution : Contributions) {
// Report an ill-formed contribution.
if (!Contribution) {
OS << "error: invalid contribution to string offsets table in section ."
<< SectionName << ".\n";
return;
}
dwarf::DwarfFormat Format = Contribution->getFormat();
uint16_t Version = Contribution->getVersion();
uint64_t ContributionHeader = Contribution->Base;
// In DWARF v5 there is a contribution header that immediately precedes
// the string offsets base (the location we have previously retrieved from
// the CU DIE's DW_AT_str_offsets attribute). The header is located either
// 8 or 16 bytes before the base, depending on the contribution's format.
if (Version >= 5)
ContributionHeader -= Format == DWARF32 ? 8 : 16;
// Detect overlapping contributions.
if (Offset > ContributionHeader) {
WithColor::error()
<< "overlapping contributions to string offsets table in section ."
<< SectionName << ".\n";
return;
}
// Report a gap in the table.
if (Offset < ContributionHeader) {
OS << format("0x%8.8" PRIx64 ": Gap, length = ", Offset);
OS << (ContributionHeader - Offset) << "\n";
}
OS << format("0x%8.8" PRIx64 ": ", ContributionHeader);
// In DWARF v5 the contribution size in the descriptor does not equal
// the originally encoded length (it does not contain the length of the
// version field and the padding, a total of 4 bytes). Add them back in
// for reporting.
OS << "Contribution size = " << (Contribution->Size + (Version < 5 ? 0 : 4))
<< ", Format = " << (Format == DWARF32 ? "DWARF32" : "DWARF64")
<< ", Version = " << Version << "\n";
Offset = Contribution->Base;
unsigned EntrySize = Contribution->getDwarfOffsetByteSize();
while (Offset - Contribution->Base < Contribution->Size) {
OS << format("0x%8.8" PRIx64 ": ", Offset);
uint64_t StringOffset =
StrOffsetExt.getRelocatedValue(EntrySize, &Offset);
OS << format("%8.8" PRIx64 " ", StringOffset);
const char *S = StrData.getCStr(&StringOffset);
if (S)
OS << format("\"%s\"", S);
OS << "\n";
}
}
// Report a gap at the end of the table.
if (Offset < SectionSize) {
OS << format("0x%8.8" PRIx64 ": Gap, length = ", Offset);
OS << (SectionSize - Offset) << "\n";
}
}
// Dump a DWARF string offsets section. This may be a DWARF v5 formatted
// string offsets section, where each compile or type unit contributes a
// number of entries (string offsets), with each contribution preceded by
// a header containing size and version number. Alternatively, it may be a
// monolithic series of string offsets, as generated by the pre-DWARF v5
// implementation of split DWARF.
static void dumpStringOffsetsSection(raw_ostream &OS, StringRef SectionName,
const DWARFObject &Obj,
const DWARFSection &StringOffsetsSection,
StringRef StringSection,
DWARFContext::unit_iterator_range Units,
bool LittleEndian, unsigned MaxVersion) {
// If we have at least one (compile or type) unit with DWARF v5 or greater,
// we assume that the section is formatted like a DWARF v5 string offsets
// section.
if (MaxVersion >= 5)
dumpDWARFv5StringOffsetsSection(OS, SectionName, Obj, StringOffsetsSection,
StringSection, Units, LittleEndian);
else {
DataExtractor strOffsetExt(StringOffsetsSection.Data, LittleEndian, 0);
uint64_t offset = 0;
uint64_t size = StringOffsetsSection.Data.size();
// Ensure that size is a multiple of the size of an entry.
if (size & ((uint64_t)(sizeof(uint32_t) - 1))) {
OS << "error: size of ." << SectionName << " is not a multiple of "
<< sizeof(uint32_t) << ".\n";
size &= -(uint64_t)sizeof(uint32_t);
}
DataExtractor StrData(StringSection, LittleEndian, 0);
while (offset < size) {
OS << format("0x%8.8" PRIx64 ": ", offset);
uint64_t StringOffset = strOffsetExt.getU32(&offset);
OS << format("%8.8" PRIx64 " ", StringOffset);
const char *S = StrData.getCStr(&StringOffset);
if (S)
OS << format("\"%s\"", S);
OS << "\n";
}
}
}
// Dump the .debug_addr section.
static void dumpAddrSection(raw_ostream &OS, DWARFDataExtractor &AddrData,
DIDumpOptions DumpOpts, uint16_t Version,
uint8_t AddrSize) {
uint64_t Offset = 0;
while (AddrData.isValidOffset(Offset)) {
DWARFDebugAddrTable AddrTable;
uint64_t TableOffset = Offset;
if (Error Err = AddrTable.extract(AddrData, &Offset, Version, AddrSize,
DWARFContext::dumpWarning)) {
WithColor::error() << toString(std::move(Err)) << '\n';
// Keep going after an error, if we can, assuming that the length field
// could be read. If it couldn't, stop reading the section.
if (!AddrTable.hasValidLength())
break;
Offset = TableOffset + AddrTable.getLength();
} else {
AddrTable.dump(OS, DumpOpts);
}
}
}
// Dump the .debug_rnglists or .debug_rnglists.dwo section (DWARF v5).
static void dumpRnglistsSection(
raw_ostream &OS, DWARFDataExtractor &rnglistData,
llvm::function_ref<Optional<object::SectionedAddress>(uint32_t)>
LookupPooledAddress,
DIDumpOptions DumpOpts) {
uint64_t Offset = 0;
while (rnglistData.isValidOffset(Offset)) {
llvm::DWARFDebugRnglistTable Rnglists;
uint64_t TableOffset = Offset;
if (Error Err = Rnglists.extract(rnglistData, &Offset)) {
WithColor::error() << toString(std::move(Err)) << '\n';
uint64_t Length = Rnglists.length();
// Keep going after an error, if we can, assuming that the length field
// could be read. If it couldn't, stop reading the section.
if (Length == 0)
break;
Offset = TableOffset + Length;
} else {
Rnglists.dump(OS, LookupPooledAddress, DumpOpts);
}
}
}
static void dumpLoclistsSection(raw_ostream &OS, DIDumpOptions DumpOpts,
DWARFDataExtractor Data,
const MCRegisterInfo *MRI,
Optional<uint64_t> DumpOffset) {
uint64_t Offset = 0;
while (Data.isValidOffset(Offset)) {
DWARFListTableHeader Header(".debug_loclists", "locations");
if (Error E = Header.extract(Data, &Offset)) {
WithColor::error() << toString(std::move(E)) << '\n';
return;
}
Header.dump(OS, DumpOpts);
uint64_t EndOffset = Header.length() + Header.getHeaderOffset();
Data.setAddressSize(Header.getAddrSize());
if (DumpOffset) {
if (DumpOffset >= Offset && DumpOffset < EndOffset) {
Offset = *DumpOffset;
DWARFDebugLoclists::dumpLocationList(Data, &Offset, Header.getVersion(),
OS, /*BaseAddr=*/0, MRI, nullptr,
DumpOpts, /*Indent=*/0);
OS << "\n";
return;
}
} else {
DWARFDebugLoclists::dumpRange(Data, Offset, EndOffset - Offset,
Header.getVersion(), OS, 0, MRI, DumpOpts);
}
Offset = EndOffset;
}
}
void DWARFContext::dump(
raw_ostream &OS, DIDumpOptions DumpOpts,
std::array<Optional<uint64_t>, DIDT_ID_Count> DumpOffsets) {
uint64_t DumpType = DumpOpts.DumpType;
StringRef Extension = sys::path::extension(DObj->getFileName());
bool IsDWO = (Extension == ".dwo") || (Extension == ".dwp");
#if 0 // XXX BINARYEN
// Print UUID header.
const auto *ObjFile = DObj->getFile();
if (DumpType & DIDT_UUID)
dumpUUID(OS, *ObjFile);
#endif
// Print a header for each explicitly-requested section.
// Otherwise just print one for non-empty sections.
// Only print empty .dwo section headers when dumping a .dwo file.
bool Explicit = DumpType != DIDT_All && !IsDWO;
bool ExplicitDWO = Explicit && IsDWO;
auto shouldDump = [&](bool Explicit, const char *Name, unsigned ID,
StringRef Section) -> Optional<uint64_t> * {
unsigned Mask = 1U << ID;
bool Should = (DumpType & Mask) && (Explicit || !Section.empty());
if (!Should)
return nullptr;
OS << "\n" << Name << " contents:\n";
return &DumpOffsets[ID];
};
// Dump individual sections.
if (shouldDump(Explicit, ".debug_abbrev", DIDT_ID_DebugAbbrev,
DObj->getAbbrevSection()))
getDebugAbbrev()->dump(OS);
if (shouldDump(ExplicitDWO, ".debug_abbrev.dwo", DIDT_ID_DebugAbbrev,
DObj->getAbbrevDWOSection()))
getDebugAbbrevDWO()->dump(OS);
auto dumpDebugInfo = [&](const char *Name, unit_iterator_range Units) {
OS << '\n' << Name << " contents:\n";
if (auto DumpOffset = DumpOffsets[DIDT_ID_DebugInfo])
for (const auto &U : Units)
U->getDIEForOffset(DumpOffset.getValue())
.dump(OS, 0, DumpOpts.noImplicitRecursion());
else
for (const auto &U : Units)
U->dump(OS, DumpOpts);
};
if ((DumpType & DIDT_DebugInfo)) {
if (Explicit || getNumCompileUnits())
dumpDebugInfo(".debug_info", info_section_units());
if (ExplicitDWO || getNumDWOCompileUnits())
dumpDebugInfo(".debug_info.dwo", dwo_info_section_units());
}
auto dumpDebugType = [&](const char *Name, unit_iterator_range Units) {
OS << '\n' << Name << " contents:\n";
for (const auto &U : Units)
if (auto DumpOffset = DumpOffsets[DIDT_ID_DebugTypes])
U->getDIEForOffset(*DumpOffset)
.dump(OS, 0, DumpOpts.noImplicitRecursion());
else
U->dump(OS, DumpOpts);
};
if ((DumpType & DIDT_DebugTypes)) {
if (Explicit || getNumTypeUnits())
dumpDebugType(".debug_types", types_section_units());
if (ExplicitDWO || getNumDWOTypeUnits())
dumpDebugType(".debug_types.dwo", dwo_types_section_units());
}
if (const auto *Off = shouldDump(Explicit, ".debug_loc", DIDT_ID_DebugLoc,
DObj->getLocSection().Data)) {
getDebugLoc()->dump(OS, getRegisterInfo(), DumpOpts, *Off);
}
if (const auto *Off =
shouldDump(Explicit, ".debug_loclists", DIDT_ID_DebugLoclists,
DObj->getLoclistsSection().Data)) {
DWARFDataExtractor Data(*DObj, DObj->getLoclistsSection(), isLittleEndian(),
0);
dumpLoclistsSection(OS, DumpOpts, Data, getRegisterInfo(), *Off);
}
if (const auto *Off =
shouldDump(ExplicitDWO, ".debug_loc.dwo", DIDT_ID_DebugLoc,
DObj->getLocDWOSection().Data)) {
DWARFDataExtractor Data(*DObj, DObj->getLocDWOSection(), isLittleEndian(),
4);
if (*Off) {
uint64_t Offset = **Off;
DWARFDebugLoclists::dumpLocationList(Data, &Offset, /*Version=*/4, OS,
/*BaseAddr=*/0, getRegisterInfo(),
nullptr, DumpOpts, /*Indent=*/0);
OS << "\n";
} else {
DWARFDebugLoclists::dumpRange(Data, 0, Data.getData().size(),
/*Version=*/4, OS, /*BaseAddr=*/0,
getRegisterInfo(), DumpOpts);
}
}
if (const auto *Off = shouldDump(Explicit, ".debug_frame", DIDT_ID_DebugFrame,
DObj->getFrameSection().Data))
getDebugFrame()->dump(OS, getRegisterInfo(), *Off);
if (const auto *Off = shouldDump(Explicit, ".eh_frame", DIDT_ID_DebugFrame,
DObj->getEHFrameSection().Data))
getEHFrame()->dump(OS, getRegisterInfo(), *Off);
if (DumpType & DIDT_DebugMacro) {
if (Explicit || !getDebugMacro()->empty()) {
OS << "\n.debug_macinfo contents:\n";
getDebugMacro()->dump(OS);
}
}
if (shouldDump(Explicit, ".debug_aranges", DIDT_ID_DebugAranges,
DObj->getArangesSection())) {
uint64_t offset = 0;
DataExtractor arangesData(DObj->getArangesSection(), isLittleEndian(), 0);
DWARFDebugArangeSet set;
while (set.extract(arangesData, &offset))
set.dump(OS);
}
auto DumpLineSection = [&](DWARFDebugLine::SectionParser Parser,
DIDumpOptions DumpOpts,
Optional<uint64_t> DumpOffset) {
while (!Parser.done()) {
if (DumpOffset && Parser.getOffset() != *DumpOffset) {
Parser.skip(dumpWarning);
continue;
}
OS << "debug_line[" << format("0x%8.8" PRIx64, Parser.getOffset())
<< "]\n";
if (DumpOpts.Verbose) {
Parser.parseNext(dumpWarning, dumpWarning, &OS);
} else {
DWARFDebugLine::LineTable LineTable =
Parser.parseNext(dumpWarning, dumpWarning);
LineTable.dump(OS, DumpOpts);
}
}
};
if (const auto *Off = shouldDump(Explicit, ".debug_line", DIDT_ID_DebugLine,
DObj->getLineSection().Data)) {
DWARFDataExtractor LineData(*DObj, DObj->getLineSection(), isLittleEndian(),
0);
DWARFDebugLine::SectionParser Parser(LineData, *this, compile_units(),
type_units());
DumpLineSection(Parser, DumpOpts, *Off);
}
if (const auto *Off =
shouldDump(ExplicitDWO, ".debug_line.dwo", DIDT_ID_DebugLine,
DObj->getLineDWOSection().Data)) {
DWARFDataExtractor LineData(*DObj, DObj->getLineDWOSection(),
isLittleEndian(), 0);
DWARFDebugLine::SectionParser Parser(LineData, *this, dwo_compile_units(),
dwo_type_units());
DumpLineSection(Parser, DumpOpts, *Off);
}
if (shouldDump(Explicit, ".debug_cu_index", DIDT_ID_DebugCUIndex,
DObj->getCUIndexSection())) {
getCUIndex().dump(OS);
}
if (shouldDump(Explicit, ".debug_tu_index", DIDT_ID_DebugTUIndex,
DObj->getTUIndexSection())) {
getTUIndex().dump(OS);
}
if (shouldDump(Explicit, ".debug_str", DIDT_ID_DebugStr,
DObj->getStrSection())) {
DataExtractor strData(DObj->getStrSection(), isLittleEndian(), 0);
uint64_t offset = 0;
uint64_t strOffset = 0;
while (const char *s = strData.getCStr(&offset)) {
OS << format("0x%8.8" PRIx64 ": \"%s\"\n", strOffset, s);
strOffset = offset;
}
}
if (shouldDump(ExplicitDWO, ".debug_str.dwo", DIDT_ID_DebugStr,
DObj->getStrDWOSection())) {
DataExtractor strDWOData(DObj->getStrDWOSection(), isLittleEndian(), 0);
uint64_t offset = 0;
uint64_t strDWOOffset = 0;
while (const char *s = strDWOData.getCStr(&offset)) {
OS << format("0x%8.8" PRIx64 ": \"%s\"\n", strDWOOffset, s);
strDWOOffset = offset;
}
}
if (shouldDump(Explicit, ".debug_line_str", DIDT_ID_DebugLineStr,
DObj->getLineStrSection())) {
DataExtractor strData(DObj->getLineStrSection(), isLittleEndian(), 0);
uint64_t offset = 0;
uint64_t strOffset = 0;
while (const char *s = strData.getCStr(&offset)) {
OS << format("0x%8.8" PRIx64 ": \"", strOffset);
OS.write_escaped(s);
OS << "\"\n";
strOffset = offset;
}
}
if (shouldDump(Explicit, ".debug_addr", DIDT_ID_DebugAddr,
DObj->getAddrSection().Data)) {
DWARFDataExtractor AddrData(*DObj, DObj->getAddrSection(),
isLittleEndian(), 0);
dumpAddrSection(OS, AddrData, DumpOpts, getMaxVersion(), getCUAddrSize());
}
if (shouldDump(Explicit, ".debug_ranges", DIDT_ID_DebugRanges,
DObj->getRangesSection().Data)) {
uint8_t savedAddressByteSize = getCUAddrSize();
DWARFDataExtractor rangesData(*DObj, DObj->getRangesSection(),
isLittleEndian(), savedAddressByteSize);
uint64_t offset = 0;
DWARFDebugRangeList rangeList;
while (rangesData.isValidOffset(offset)) {
if (Error E = rangeList.extract(rangesData, &offset)) {
WithColor::error() << toString(std::move(E)) << '\n';
break;
}
rangeList.dump(OS);
}
}
auto LookupPooledAddress = [&](uint32_t Index) -> Optional<SectionedAddress> {
const auto &CUs = compile_units();
auto I = CUs.begin();
if (I == CUs.end())
return None;
return (*I)->getAddrOffsetSectionItem(Index);
};
if (shouldDump(Explicit, ".debug_rnglists", DIDT_ID_DebugRnglists,
DObj->getRnglistsSection().Data)) {
DWARFDataExtractor RnglistData(*DObj, DObj->getRnglistsSection(),
isLittleEndian(), 0);
dumpRnglistsSection(OS, RnglistData, LookupPooledAddress, DumpOpts);
}
if (shouldDump(ExplicitDWO, ".debug_rnglists.dwo", DIDT_ID_DebugRnglists,
DObj->getRnglistsDWOSection().Data)) {
DWARFDataExtractor RnglistData(*DObj, DObj->getRnglistsDWOSection(),
isLittleEndian(), 0);
dumpRnglistsSection(OS, RnglistData, LookupPooledAddress, DumpOpts);
}
if (shouldDump(Explicit, ".debug_pubnames", DIDT_ID_DebugPubnames,
DObj->getPubnamesSection().Data))
DWARFDebugPubTable(*DObj, DObj->getPubnamesSection(), isLittleEndian(), false)
.dump(OS);
if (shouldDump(Explicit, ".debug_pubtypes", DIDT_ID_DebugPubtypes,
DObj->getPubtypesSection().Data))
DWARFDebugPubTable(*DObj, DObj->getPubtypesSection(), isLittleEndian(), false)
.dump(OS);
if (shouldDump(Explicit, ".debug_gnu_pubnames", DIDT_ID_DebugGnuPubnames,
DObj->getGnuPubnamesSection().Data))
DWARFDebugPubTable(*DObj, DObj->getGnuPubnamesSection(), isLittleEndian(),
true /* GnuStyle */)
.dump(OS);
if (shouldDump(Explicit, ".debug_gnu_pubtypes", DIDT_ID_DebugGnuPubtypes,
DObj->getGnuPubtypesSection().Data))
DWARFDebugPubTable(*DObj, DObj->getGnuPubtypesSection(), isLittleEndian(),
true /* GnuStyle */)
.dump(OS);
if (shouldDump(Explicit, ".debug_str_offsets", DIDT_ID_DebugStrOffsets,
DObj->getStrOffsetsSection().Data))
dumpStringOffsetsSection(OS, "debug_str_offsets", *DObj,
DObj->getStrOffsetsSection(),
DObj->getStrSection(), normal_units(),
isLittleEndian(), getMaxVersion());
if (shouldDump(ExplicitDWO, ".debug_str_offsets.dwo", DIDT_ID_DebugStrOffsets,
DObj->getStrOffsetsDWOSection().Data))
dumpStringOffsetsSection(OS, "debug_str_offsets.dwo", *DObj,
DObj->getStrOffsetsDWOSection(),
DObj->getStrDWOSection(), dwo_units(),
isLittleEndian(), getMaxDWOVersion());
if (shouldDump(Explicit, ".gdb_index", DIDT_ID_GdbIndex,
DObj->getGdbIndexSection())) {
getGdbIndex().dump(OS);
}
if (shouldDump(Explicit, ".apple_names", DIDT_ID_AppleNames,
DObj->getAppleNamesSection().Data))
getAppleNames().dump(OS);
if (shouldDump(Explicit, ".apple_types", DIDT_ID_AppleTypes,
DObj->getAppleTypesSection().Data))
getAppleTypes().dump(OS);
if (shouldDump(Explicit, ".apple_namespaces", DIDT_ID_AppleNamespaces,
DObj->getAppleNamespacesSection().Data))
getAppleNamespaces().dump(OS);
if (shouldDump(Explicit, ".apple_objc", DIDT_ID_AppleObjC,
DObj->getAppleObjCSection().Data))
getAppleObjC().dump(OS);
if (shouldDump(Explicit, ".debug_names", DIDT_ID_DebugNames,
DObj->getNamesSection().Data))
getDebugNames().dump(OS);
}
DWARFCompileUnit *DWARFContext::getDWOCompileUnitForHash(uint64_t Hash) {
parseDWOUnits(LazyParse);
if (const auto &CUI = getCUIndex()) {
if (const auto *R = CUI.getFromHash(Hash))
return dyn_cast_or_null<DWARFCompileUnit>(
DWOUnits.getUnitForIndexEntry(*R));
return nullptr;
}
// If there's no index, just search through the CUs in the DWO - there's
// probably only one unless this is something like LTO - though an in-process
// built/cached lookup table could be used in that case to improve repeated
// lookups of different CUs in the DWO.
for (const auto &DWOCU : dwo_compile_units()) {
// Might not have parsed DWO ID yet.
if (!DWOCU->getDWOId()) {
if (Optional<uint64_t> DWOId =
toUnsigned(DWOCU->getUnitDIE().find(DW_AT_GNU_dwo_id)))
DWOCU->setDWOId(*DWOId);
else
// No DWO ID?
continue;
}
if (DWOCU->getDWOId() == Hash)
return dyn_cast<DWARFCompileUnit>(DWOCU.get());
}
return nullptr;
}
DWARFDie DWARFContext::getDIEForOffset(uint64_t Offset) {
parseNormalUnits();
if (auto *CU = NormalUnits.getUnitForOffset(Offset))
return CU->getDIEForOffset(Offset);
return DWARFDie();
}
bool DWARFContext::verify(raw_ostream &OS, DIDumpOptions DumpOpts) {
bool Success = true;
DWARFVerifier verifier(OS, *this, DumpOpts);
Success &= verifier.handleDebugAbbrev();
if (DumpOpts.DumpType & DIDT_DebugInfo)
Success &= verifier.handleDebugInfo();
if (DumpOpts.DumpType & DIDT_DebugLine)
Success &= verifier.handleDebugLine();
Success &= verifier.handleAccelTables();
return Success;
}
const DWARFUnitIndex &DWARFContext::getCUIndex() {
if (CUIndex)
return *CUIndex;
DataExtractor CUIndexData(DObj->getCUIndexSection(), isLittleEndian(), 0);
CUIndex = std::make_unique<DWARFUnitIndex>(DW_SECT_INFO);
CUIndex->parse(CUIndexData);
return *CUIndex;
}
const DWARFUnitIndex &DWARFContext::getTUIndex() {
if (TUIndex)
return *TUIndex;
DataExtractor TUIndexData(DObj->getTUIndexSection(), isLittleEndian(), 0);
TUIndex = std::make_unique<DWARFUnitIndex>(DW_SECT_TYPES);
TUIndex->parse(TUIndexData);
return *TUIndex;
}
DWARFGdbIndex &DWARFContext::getGdbIndex() {
if (GdbIndex)
return *GdbIndex;
DataExtractor GdbIndexData(DObj->getGdbIndexSection(), true /*LE*/, 0);
GdbIndex = std::make_unique<DWARFGdbIndex>();
GdbIndex->parse(GdbIndexData);
return *GdbIndex;
}
const DWARFDebugAbbrev *DWARFContext::getDebugAbbrev() {
if (Abbrev)
return Abbrev.get();
DataExtractor abbrData(DObj->getAbbrevSection(), isLittleEndian(), 0);
Abbrev.reset(new DWARFDebugAbbrev());
Abbrev->extract(abbrData);
return Abbrev.get();
}
const DWARFDebugAbbrev *DWARFContext::getDebugAbbrevDWO() {
if (AbbrevDWO)
return AbbrevDWO.get();
DataExtractor abbrData(DObj->getAbbrevDWOSection(), isLittleEndian(), 0);
AbbrevDWO.reset(new DWARFDebugAbbrev());
AbbrevDWO->extract(abbrData);
return AbbrevDWO.get();
}
const DWARFDebugLoc *DWARFContext::getDebugLoc() {
if (Loc)
return Loc.get();
Loc.reset(new DWARFDebugLoc);
// Assume all units have the same address byte size.
if (getNumCompileUnits()) {
DWARFDataExtractor LocData(*DObj, DObj->getLocSection(), isLittleEndian(),
getUnitAtIndex(0)->getAddressByteSize());
Loc->parse(LocData);
}
return Loc.get();
}
const DWARFDebugAranges *DWARFContext::getDebugAranges() {
if (Aranges)
return Aranges.get();
Aranges.reset(new DWARFDebugAranges());
Aranges->generate(this);
return Aranges.get();
}
const DWARFDebugFrame *DWARFContext::getDebugFrame() {
if (DebugFrame)
return DebugFrame.get();
// There's a "bug" in the DWARFv3 standard with respect to the target address
// size within debug frame sections. While DWARF is supposed to be independent
// of its container, FDEs have fields with size being "target address size",
// which isn't specified in DWARF in general. It's only specified for CUs, but
// .eh_frame can appear without a .debug_info section. Follow the example of
// other tools (libdwarf) and extract this from the container (ObjectFile
// provides this information). This problem is fixed in DWARFv4
// See this dwarf-discuss discussion for more details:
// http://lists.dwarfstd.org/htdig.cgi/dwarf-discuss-dwarfstd.org/2011-December/001173.html
DWARFDataExtractor debugFrameData(*DObj, DObj->getFrameSection(),
isLittleEndian(), DObj->getAddressSize());
DebugFrame.reset(new DWARFDebugFrame(getArch(), false /* IsEH */));
DebugFrame->parse(debugFrameData);
return DebugFrame.get();
}
const DWARFDebugFrame *DWARFContext::getEHFrame() {
if (EHFrame)
return EHFrame.get();
DWARFDataExtractor debugFrameData(*DObj, DObj->getEHFrameSection(),
isLittleEndian(), DObj->getAddressSize());
DebugFrame.reset(new DWARFDebugFrame(getArch(), true /* IsEH */));
DebugFrame->parse(debugFrameData);
return DebugFrame.get();
}
const DWARFDebugMacro *DWARFContext::getDebugMacro() {
if (Macro)
return Macro.get();
DataExtractor MacinfoData(DObj->getMacinfoSection(), isLittleEndian(), 0);
Macro.reset(new DWARFDebugMacro());
Macro->parse(MacinfoData);
return Macro.get();
}
template <typename T>
static T &getAccelTable(std::unique_ptr<T> &Cache, const DWARFObject &Obj,
const DWARFSection &Section, StringRef StringSection,
bool IsLittleEndian) {
if (Cache)
return *Cache;
DWARFDataExtractor AccelSection(Obj, Section, IsLittleEndian, 0);
DataExtractor StrData(StringSection, IsLittleEndian, 0);
Cache.reset(new T(AccelSection, StrData));
if (Error E = Cache->extract())
llvm::consumeError(std::move(E));
return *Cache;
}
const DWARFDebugNames &DWARFContext::getDebugNames() {
return getAccelTable(Names, *DObj, DObj->getNamesSection(),
DObj->getStrSection(), isLittleEndian());
}
const AppleAcceleratorTable &DWARFContext::getAppleNames() {
return getAccelTable(AppleNames, *DObj, DObj->getAppleNamesSection(),
DObj->getStrSection(), isLittleEndian());
}
const AppleAcceleratorTable &DWARFContext::getAppleTypes() {
return getAccelTable(AppleTypes, *DObj, DObj->getAppleTypesSection(),
DObj->getStrSection(), isLittleEndian());
}
const AppleAcceleratorTable &DWARFContext::getAppleNamespaces() {
return getAccelTable(AppleNamespaces, *DObj,
DObj->getAppleNamespacesSection(),
DObj->getStrSection(), isLittleEndian());
}
const AppleAcceleratorTable &DWARFContext::getAppleObjC() {
return getAccelTable(AppleObjC, *DObj, DObj->getAppleObjCSection(),
DObj->getStrSection(), isLittleEndian());
}
const DWARFDebugLine::LineTable *
DWARFContext::getLineTableForUnit(DWARFUnit *U) {
Expected<const DWARFDebugLine::LineTable *> ExpectedLineTable =
getLineTableForUnit(U, dumpWarning);
if (!ExpectedLineTable) {
dumpWarning(ExpectedLineTable.takeError());
return nullptr;
}
return *ExpectedLineTable;
}
Expected<const DWARFDebugLine::LineTable *> DWARFContext::getLineTableForUnit(
DWARFUnit *U, std::function<void(Error)> RecoverableErrorCallback) {
if (!Line)
Line.reset(new DWARFDebugLine);
auto UnitDIE = U->getUnitDIE();
if (!UnitDIE)
return nullptr;
auto Offset = toSectionOffset(UnitDIE.find(DW_AT_stmt_list));
if (!Offset)
return nullptr; // No line table for this compile unit.
uint64_t stmtOffset = *Offset + U->getLineTableOffset();
// See if the line table is cached.
if (const DWARFLineTable *lt = Line->getLineTable(stmtOffset))
return lt;
// Make sure the offset is good before we try to parse.
if (stmtOffset >= U->getLineSection().Data.size())
return nullptr;
// We have to parse it first.
DWARFDataExtractor lineData(*DObj, U->getLineSection(), isLittleEndian(),
U->getAddressByteSize());
return Line->getOrParseLineTable(lineData, stmtOffset, *this, U,
RecoverableErrorCallback);
}
void DWARFContext::parseNormalUnits() {
if (!NormalUnits.empty())
return;
DObj->forEachInfoSections([&](const DWARFSection &S) {
NormalUnits.addUnitsForSection(*this, S, DW_SECT_INFO);
});
NormalUnits.finishedInfoUnits();
DObj->forEachTypesSections([&](const DWARFSection &S) {
NormalUnits.addUnitsForSection(*this, S, DW_SECT_TYPES);
});
}
void DWARFContext::parseDWOUnits(bool Lazy) {
if (!DWOUnits.empty())
return;
DObj->forEachInfoDWOSections([&](const DWARFSection &S) {
DWOUnits.addUnitsForDWOSection(*this, S, DW_SECT_INFO, Lazy);
});
DWOUnits.finishedInfoUnits();
DObj->forEachTypesDWOSections([&](const DWARFSection &S) {
DWOUnits.addUnitsForDWOSection(*this, S, DW_SECT_TYPES, Lazy);
});
}
DWARFCompileUnit *DWARFContext::getCompileUnitForOffset(uint64_t Offset) {
parseNormalUnits();
return dyn_cast_or_null<DWARFCompileUnit>(
NormalUnits.getUnitForOffset(Offset));
}
DWARFCompileUnit *DWARFContext::getCompileUnitForAddress(uint64_t Address) {
// First, get the offset of the compile unit.
uint64_t CUOffset = getDebugAranges()->findAddress(Address);
// Retrieve the compile unit.
return getCompileUnitForOffset(CUOffset);
}
DWARFContext::DIEsForAddress DWARFContext::getDIEsForAddress(uint64_t Address) {
DIEsForAddress Result;
DWARFCompileUnit *CU = getCompileUnitForAddress(Address);
if (!CU)
return Result;
Result.CompileUnit = CU;
Result.FunctionDIE = CU->getSubroutineForAddress(Address);
std::vector<DWARFDie> Worklist;
Worklist.push_back(Result.FunctionDIE);
while (!Worklist.empty()) {
DWARFDie DIE = Worklist.back();
Worklist.pop_back();
if (!DIE.isValid())
continue;
if (DIE.getTag() == DW_TAG_lexical_block &&
DIE.addressRangeContainsAddress(Address)) {
Result.BlockDIE = DIE;
break;
}
for (auto Child : DIE)
Worklist.push_back(Child);
}
return Result;
}
/// TODO: change input parameter from "uint64_t Address"
/// into "SectionedAddress Address"
static bool getFunctionNameAndStartLineForAddress(DWARFCompileUnit *CU,
uint64_t Address,
FunctionNameKind Kind,
std::string &FunctionName,
uint32_t &StartLine) {
// The address may correspond to instruction in some inlined function,
// so we have to build the chain of inlined functions and take the
// name of the topmost function in it.
SmallVector<DWARFDie, 4> InlinedChain;
CU->getInlinedChainForAddress(Address, InlinedChain);
if (InlinedChain.empty())
return false;
const DWARFDie &DIE = InlinedChain[0];
bool FoundResult = false;
const char *Name = nullptr;
if (Kind != FunctionNameKind::None && (Name = DIE.getSubroutineName(Kind))) {
FunctionName = Name;
FoundResult = true;
}
if (auto DeclLineResult = DIE.getDeclLine()) {
StartLine = DeclLineResult;
FoundResult = true;
}
return FoundResult;
}
static Optional<uint64_t> getTypeSize(DWARFDie Type, uint64_t PointerSize) {
if (auto SizeAttr = Type.find(DW_AT_byte_size))
if (Optional<uint64_t> Size = SizeAttr->getAsUnsignedConstant())
return Size;
switch (Type.getTag()) {
case DW_TAG_pointer_type:
case DW_TAG_reference_type:
case DW_TAG_rvalue_reference_type:
return PointerSize;
case DW_TAG_ptr_to_member_type: {
if (DWARFDie BaseType = Type.getAttributeValueAsReferencedDie(DW_AT_type))
if (BaseType.getTag() == DW_TAG_subroutine_type)
return 2 * PointerSize;
return PointerSize;
}
case DW_TAG_const_type:
case DW_TAG_volatile_type:
case DW_TAG_restrict_type: