| //===- DWARFContext.cpp ---------------------------------------------------===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is distributed under the University of Illinois Open Source |
| // License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #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/RelocVisitor.h" |
| #include "llvm/Support/Casting.h" |
| #include "llvm/Support/DataExtractor.h" |
| #include "llvm/Support/Error.h" |
| #include "llvm/Support/Format.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) { |
| 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'; |
| } |
| } |
| } |
| |
| 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::cu_iterator_range CUs, |
| DWARFContext::tu_section_iterator_range TUSs) { |
| ContributionCollection Contributions; |
| for (const auto &CU : CUs) |
| Contributions.push_back(CU->getStringOffsetsTableContribution()); |
| for (const auto &TUS : TUSs) |
| for (const auto &TU : TUS) |
| Contributions.push_back(TU->getStringOffsetsTableContribution()); |
| |
| // 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.begin(), Contributions.end(), |
| [](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::cu_iterator_range CUs, |
| DWARFContext::tu_section_iterator_range TUSs, bool LittleEndian) { |
| auto Contributions = collectContributionData(CUs, TUSs); |
| DWARFDataExtractor StrOffsetExt(Obj, StringOffsetsSection, LittleEndian, 0); |
| DataExtractor StrData(StringSection, LittleEndian, 0); |
| uint64_t SectionSize = StringOffsetsSection.Data.size(); |
| uint32_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) { |
| OS << "error: overlapping contributions to string offsets table in " |
| "section ." |
| << SectionName << ".\n"; |
| return; |
| } |
| // Report a gap in the table. |
| if (Offset < ContributionHeader) { |
| OS << format("0x%8.8x: Gap, length = ", Offset); |
| OS << (ContributionHeader - Offset) << "\n"; |
| } |
| OS << format("0x%8.8x: ", (uint32_t)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%8.8x: ", Offset); |
| // FIXME: We can only extract strings if the offset fits in 32 bits. |
| uint64_t StringOffset = |
| StrOffsetExt.getRelocatedValue(EntrySize, &Offset); |
| // Extract the string if we can and display it. Otherwise just report |
| // the offset. |
| if (StringOffset <= std::numeric_limits<uint32_t>::max()) { |
| uint32_t StringOffset32 = (uint32_t)StringOffset; |
| OS << format("%8.8x ", StringOffset32); |
| const char *S = StrData.getCStr(&StringOffset32); |
| if (S) |
| OS << format("\"%s\"", S); |
| } else |
| OS << format("%16.16" PRIx64 " ", StringOffset); |
| OS << "\n"; |
| } |
| } |
| // Report a gap at the end of the table. |
| if (Offset < SectionSize) { |
| OS << format("0x%8.8x: 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::cu_iterator_range CUs, |
| DWARFContext::tu_section_iterator_range TUSs, 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, CUs, TUSs, LittleEndian); |
| else { |
| DataExtractor strOffsetExt(StringOffsetsSection.Data, LittleEndian, 0); |
| uint32_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%8.8x: ", offset); |
| uint32_t StringOffset = strOffsetExt.getU32(&offset); |
| OS << format("%8.8x ", 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) { |
| // TODO: Make this more general: add callback types to Error.h, create |
| // implementation and make all DWARF classes use them. |
| static auto WarnCallback = [](Error Warn) { |
| handleAllErrors(std::move(Warn), [](ErrorInfoBase &Info) { |
| WithColor::warning() << Info.message() << '\n'; |
| }); |
| }; |
| uint32_t Offset = 0; |
| while (AddrData.isValidOffset(Offset)) { |
| DWARFDebugAddrTable AddrTable; |
| uint32_t TableOffset = Offset; |
| if (Error Err = AddrTable.extract(AddrData, &Offset, Version, |
| AddrSize, WarnCallback)) { |
| 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; |
| uint64_t Length = AddrTable.getLength(); |
| Offset = TableOffset + Length; |
| } else { |
| AddrTable.dump(OS, DumpOpts); |
| } |
| } |
| } |
| |
| // Dump the .debug_rnglists or .debug_rnglists.dwo section (DWARF v5). |
| static void dumpRnglistsSection(raw_ostream &OS, |
| DWARFDataExtractor &rnglistData, |
| DIDumpOptions DumpOpts) { |
| uint32_t Offset = 0; |
| while (rnglistData.isValidOffset(Offset)) { |
| llvm::DWARFDebugRnglistTable Rnglists; |
| uint32_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, DumpOpts); |
| } |
| } |
| } |
| |
| void DWARFContext::dump( |
| raw_ostream &OS, DIDumpOptions DumpOpts, |
| std::array<Optional<uint64_t>, DIDT_ID_Count> DumpOffsets) { |
| |
| Optional<uint64_t> DumpOffset; |
| uint64_t DumpType = DumpOpts.DumpType; |
| |
| StringRef Extension = sys::path::extension(DObj->getFileName()); |
| bool IsDWO = (Extension == ".dwo") || (Extension == ".dwp"); |
| |
| // Print UUID header. |
| const auto *ObjFile = DObj->getFile(); |
| if (DumpType & DIDT_UUID) |
| dumpUUID(OS, *ObjFile); |
| |
| // 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) { |
| DumpOffset = DumpOffsets[ID]; |
| unsigned Mask = 1U << ID; |
| bool Should = (DumpType & Mask) && (Explicit || !Section.empty()); |
| if (Should) |
| OS << "\n" << Name << " contents:\n"; |
| return Should; |
| }; |
| |
| // 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 = [&](bool IsExplicit, const char *Name, |
| DWARFSection Section, cu_iterator_range CUs) { |
| if (shouldDump(IsExplicit, Name, DIDT_ID_DebugInfo, Section.Data)) { |
| if (DumpOffset) |
| getDIEForOffset(DumpOffset.getValue()) |
| .dump(OS, 0, DumpOpts.noImplicitRecursion()); |
| else |
| for (const auto &CU : CUs) |
| CU->dump(OS, DumpOpts); |
| } |
| }; |
| dumpDebugInfo(Explicit, ".debug_info", DObj->getInfoSection(), |
| compile_units()); |
| dumpDebugInfo(ExplicitDWO, ".debug_info.dwo", DObj->getInfoDWOSection(), |
| dwo_compile_units()); |
| |
| auto dumpDebugType = [&](const char *Name, |
| tu_section_iterator_range TUSections) { |
| OS << '\n' << Name << " contents:\n"; |
| DumpOffset = DumpOffsets[DIDT_ID_DebugTypes]; |
| for (const auto &TUS : TUSections) |
| for (const auto &TU : TUS) |
| if (DumpOffset) |
| TU->getDIEForOffset(*DumpOffset) |
| .dump(OS, 0, DumpOpts.noImplicitRecursion()); |
| else |
| TU->dump(OS, DumpOpts); |
| }; |
| if ((DumpType & DIDT_DebugTypes)) { |
| if (Explicit || getNumTypeUnits()) |
| dumpDebugType(".debug_types", type_unit_sections()); |
| if (ExplicitDWO || getNumDWOTypeUnits()) |
| dumpDebugType(".debug_types.dwo", dwo_type_unit_sections()); |
| } |
| |
| if (shouldDump(Explicit, ".debug_loc", DIDT_ID_DebugLoc, |
| DObj->getLocSection().Data)) { |
| getDebugLoc()->dump(OS, getRegisterInfo(), DumpOffset); |
| } |
| if (shouldDump(ExplicitDWO, ".debug_loc.dwo", DIDT_ID_DebugLoc, |
| DObj->getLocDWOSection().Data)) { |
| getDebugLocDWO()->dump(OS, getRegisterInfo(), DumpOffset); |
| } |
| |
| if (shouldDump(Explicit, ".debug_frame", DIDT_ID_DebugFrame, |
| DObj->getDebugFrameSection())) |
| getDebugFrame()->dump(OS, getRegisterInfo(), DumpOffset); |
| |
| if (shouldDump(Explicit, ".eh_frame", DIDT_ID_DebugFrame, |
| DObj->getEHFrameSection())) |
| getEHFrame()->dump(OS, getRegisterInfo(), DumpOffset); |
| |
| 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->getARangeSection())) { |
| uint32_t offset = 0; |
| DataExtractor arangesData(DObj->getARangeSection(), isLittleEndian(), 0); |
| DWARFDebugArangeSet set; |
| while (set.extract(arangesData, &offset)) |
| set.dump(OS); |
| } |
| |
| auto DumpLineSection = [&](DWARFDebugLine::SectionParser Parser, |
| DIDumpOptions DumpOpts) { |
| while (!Parser.done()) { |
| if (DumpOffset && Parser.getOffset() != *DumpOffset) { |
| Parser.skip(); |
| continue; |
| } |
| OS << "debug_line[" << format("0x%8.8x", Parser.getOffset()) << "]\n"; |
| if (DumpOpts.Verbose) { |
| Parser.parseNext(DWARFDebugLine::warn, DWARFDebugLine::warn, &OS); |
| } else { |
| DWARFDebugLine::LineTable LineTable = Parser.parseNext(); |
| LineTable.dump(OS, DumpOpts); |
| } |
| } |
| }; |
| |
| if (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_unit_sections()); |
| DumpLineSection(Parser, DumpOpts); |
| } |
| |
| if (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_unit_sections()); |
| DumpLineSection(Parser, DumpOpts); |
| } |
| |
| 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->getStringSection())) { |
| DataExtractor strData(DObj->getStringSection(), isLittleEndian(), 0); |
| uint32_t offset = 0; |
| uint32_t strOffset = 0; |
| while (const char *s = strData.getCStr(&offset)) { |
| OS << format("0x%8.8x: \"%s\"\n", strOffset, s); |
| strOffset = offset; |
| } |
| } |
| if (shouldDump(ExplicitDWO, ".debug_str.dwo", DIDT_ID_DebugStr, |
| DObj->getStringDWOSection())) { |
| DataExtractor strDWOData(DObj->getStringDWOSection(), isLittleEndian(), 0); |
| uint32_t offset = 0; |
| uint32_t strDWOOffset = 0; |
| while (const char *s = strDWOData.getCStr(&offset)) { |
| OS << format("0x%8.8x: \"%s\"\n", strDWOOffset, s); |
| strDWOOffset = offset; |
| } |
| } |
| if (shouldDump(Explicit, ".debug_line_str", DIDT_ID_DebugLineStr, |
| DObj->getLineStringSection())) { |
| DataExtractor strData(DObj->getLineStringSection(), isLittleEndian(), 0); |
| uint32_t offset = 0; |
| uint32_t strOffset = 0; |
| while (const char *s = strData.getCStr(&offset)) { |
| OS << format("0x%8.8x: \"", 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->getRangeSection().Data)) { |
| uint8_t savedAddressByteSize = getCUAddrSize(); |
| DWARFDataExtractor rangesData(*DObj, DObj->getRangeSection(), |
| isLittleEndian(), savedAddressByteSize); |
| uint32_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); |
| } |
| } |
| |
| if (shouldDump(Explicit, ".debug_rnglists", DIDT_ID_DebugRnglists, |
| DObj->getRnglistsSection().Data)) { |
| DWARFDataExtractor RnglistData(*DObj, DObj->getRnglistsSection(), |
| isLittleEndian(), 0); |
| dumpRnglistsSection(OS, RnglistData, DumpOpts); |
| } |
| |
| if (shouldDump(ExplicitDWO, ".debug_rnglists.dwo", DIDT_ID_DebugRnglists, |
| DObj->getRnglistsDWOSection().Data)) { |
| DWARFDataExtractor RnglistData(*DObj, DObj->getRnglistsDWOSection(), |
| isLittleEndian(), 0); |
| dumpRnglistsSection(OS, RnglistData, DumpOpts); |
| } |
| |
| if (shouldDump(Explicit, ".debug_pubnames", DIDT_ID_DebugPubnames, |
| DObj->getPubNamesSection())) |
| DWARFDebugPubTable(DObj->getPubNamesSection(), isLittleEndian(), false) |
| .dump(OS); |
| |
| if (shouldDump(Explicit, ".debug_pubtypes", DIDT_ID_DebugPubtypes, |
| DObj->getPubTypesSection())) |
| DWARFDebugPubTable(DObj->getPubTypesSection(), isLittleEndian(), false) |
| .dump(OS); |
| |
| if (shouldDump(Explicit, ".debug_gnu_pubnames", DIDT_ID_DebugGnuPubnames, |
| DObj->getGnuPubNamesSection())) |
| DWARFDebugPubTable(DObj->getGnuPubNamesSection(), isLittleEndian(), |
| true /* GnuStyle */) |
| .dump(OS); |
| |
| if (shouldDump(Explicit, ".debug_gnu_pubtypes", DIDT_ID_DebugGnuPubtypes, |
| DObj->getGnuPubTypesSection())) |
| DWARFDebugPubTable(DObj->getGnuPubTypesSection(), isLittleEndian(), |
| true /* GnuStyle */) |
| .dump(OS); |
| |
| if (shouldDump(Explicit, ".debug_str_offsets", DIDT_ID_DebugStrOffsets, |
| DObj->getStringOffsetSection().Data)) |
| dumpStringOffsetsSection( |
| OS, "debug_str_offsets", *DObj, DObj->getStringOffsetSection(), |
| DObj->getStringSection(), compile_units(), type_unit_sections(), |
| isLittleEndian(), getMaxVersion()); |
| if (shouldDump(ExplicitDWO, ".debug_str_offsets.dwo", DIDT_ID_DebugStrOffsets, |
| DObj->getStringOffsetDWOSection().Data)) |
| dumpStringOffsetsSection( |
| OS, "debug_str_offsets.dwo", *DObj, DObj->getStringOffsetDWOSection(), |
| DObj->getStringDWOSection(), dwo_compile_units(), |
| dwo_type_unit_sections(), isLittleEndian(), getMaxVersion()); |
| |
| if (shouldDump(Explicit, ".gnu_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->getDebugNamesSection().Data)) |
| getDebugNames().dump(OS); |
| } |
| |
| DWARFCompileUnit *DWARFContext::getDWOCompileUnitForHash(uint64_t Hash) { |
| DWOCUs.parseDWO(*this, DObj->getInfoDWOSection(), true); |
| |
| if (const auto &CUI = getCUIndex()) { |
| if (const auto *R = CUI.getFromHash(Hash)) |
| return DWOCUs.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 DWOCU.get(); |
| } |
| return nullptr; |
| } |
| |
| DWARFDie DWARFContext::getDIEForOffset(uint32_t Offset) { |
| parseCompileUnits(); |
| if (auto *CU = CUs.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 = llvm::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 = llvm::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 = llvm::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 compile units have the same address byte size. |
| if (getNumCompileUnits()) { |
| DWARFDataExtractor LocData(*DObj, DObj->getLocSection(), isLittleEndian(), |
| getCompileUnitAtIndex(0)->getAddressByteSize()); |
| Loc->parse(LocData); |
| } |
| return Loc.get(); |
| } |
| |
| const DWARFDebugLocDWO *DWARFContext::getDebugLocDWO() { |
| if (LocDWO) |
| return LocDWO.get(); |
| |
| LocDWO.reset(new DWARFDebugLocDWO()); |
| // Assume all compile units have the same address byte size. |
| if (getNumCompileUnits()) { |
| DataExtractor LocData(DObj->getLocDWOSection().Data, isLittleEndian(), |
| getCompileUnitAtIndex(0)->getAddressByteSize()); |
| LocDWO->parse(LocData); |
| } |
| return LocDWO.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->getDebugFrameSection(), |
| isLittleEndian(), DObj->getAddressSize()); |
| DebugFrame.reset(new DWARFDebugFrame(false /* IsEH */)); |
| DebugFrame->parse(debugFrameData); |
| return DebugFrame.get(); |
| } |
| |
| const DWARFDebugFrame *DWARFContext::getEHFrame() { |
| if (EHFrame) |
| return EHFrame.get(); |
| |
| DWARFDataExtractor debugFrameData(DObj->getEHFrameSection(), isLittleEndian(), |
| DObj->getAddressSize()); |
| DebugFrame.reset(new DWARFDebugFrame(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->getDebugNamesSection(), |
| DObj->getStringSection(), isLittleEndian()); |
| } |
| |
| const AppleAcceleratorTable &DWARFContext::getAppleNames() { |
| return getAccelTable(AppleNames, *DObj, DObj->getAppleNamesSection(), |
| DObj->getStringSection(), isLittleEndian()); |
| } |
| |
| const AppleAcceleratorTable &DWARFContext::getAppleTypes() { |
| return getAccelTable(AppleTypes, *DObj, DObj->getAppleTypesSection(), |
| DObj->getStringSection(), isLittleEndian()); |
| } |
| |
| const AppleAcceleratorTable &DWARFContext::getAppleNamespaces() { |
| return getAccelTable(AppleNamespaces, *DObj, |
| DObj->getAppleNamespacesSection(), |
| DObj->getStringSection(), isLittleEndian()); |
| } |
| |
| const AppleAcceleratorTable &DWARFContext::getAppleObjC() { |
| return getAccelTable(AppleObjC, *DObj, DObj->getAppleObjCSection(), |
| DObj->getStringSection(), isLittleEndian()); |
| } |
| |
| const DWARFDebugLine::LineTable * |
| DWARFContext::getLineTableForUnit(DWARFUnit *U) { |
| Expected<const DWARFDebugLine::LineTable *> ExpectedLineTable = |
| getLineTableForUnit(U, DWARFDebugLine::warn); |
| if (!ExpectedLineTable) { |
| DWARFDebugLine::warn(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. |
| |
| uint32_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::parseCompileUnits() { |
| CUs.parse(*this, DObj->getInfoSection()); |
| } |
| |
| void DWARFContext::parseTypeUnits() { |
| if (!TUs.empty()) |
| return; |
| DObj->forEachTypesSections([&](const DWARFSection &S) { |
| TUs.emplace_back(); |
| TUs.back().parse(*this, S); |
| }); |
| } |
| |
| void DWARFContext::parseDWOCompileUnits() { |
| DWOCUs.parseDWO(*this, DObj->getInfoDWOSection()); |
| } |
| |
| void DWARFContext::parseDWOTypeUnits() { |
| if (!DWOTUs.empty()) |
| return; |
| DObj->forEachTypesDWOSections([&](const DWARFSection &S) { |
| DWOTUs.emplace_back(); |
| DWOTUs.back().parseDWO(*this, S); |
| }); |
| } |
| |
| DWARFCompileUnit *DWARFContext::getCompileUnitForOffset(uint32_t Offset) { |
| parseCompileUnits(); |
| return CUs.getUnitForOffset(Offset); |
| } |
| |
| DWARFCompileUnit *DWARFContext::getCompileUnitForAddress(uint64_t Address) { |
| // First, get the offset of the compile unit. |
| uint32_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.getTag() == DW_TAG_lexical_block && |
| DIE.addressRangeContainsAddress(Address)) { |
| Result.BlockDIE = DIE; |
| break; |
| } |
| |
| for (auto Child : DIE) |
| Worklist.push_back(Child); |
| } |
| |
| return Result; |
| } |
| |
| 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; |
| } |
| |
| DILineInfo DWARFContext::getLineInfoForAddress(uint64_t Address, |
| DILineInfoSpecifier Spec) { |
| DILineInfo Result; |
| |
| DWARFCompileUnit *CU = getCompileUnitForAddress(Address); |
| if (!CU) |
| return Result; |
| getFunctionNameAndStartLineForAddress(CU, Address, Spec.FNKind, |
| Result.FunctionName, |
| Result.StartLine); |
| if (Spec.FLIKind != FileLineInfoKind::None) { |
| if (const DWARFLineTable *LineTable = getLineTableForUnit(CU)) |
| LineTable->getFileLineInfoForAddress(Address, CU->getCompilationDir(), |
| Spec.FLIKind, Result); |
| } |
| return Result; |
| } |
| |
| DILineInfoTable |
| DWARFContext::getLineInfoForAddressRange(uint64_t Address, uint64_t Size, |
| DILineInfoSpecifier Spec) { |
| DILineInfoTable Lines; |
| DWARFCompileUnit *CU = getCompileUnitForAddress(Address); |
| if (!CU) |
| return Lines; |
| |
| std::string FunctionName = "<invalid>"; |
| uint32_t StartLine = 0; |
| getFunctionNameAndStartLineForAddress(CU, Address, Spec.FNKind, FunctionName, |
| StartLine); |
| |
| // If the Specifier says we don't need FileLineInfo, just |
| // return the top-most function at the starting address. |
| if (Spec.FLIKind == FileLineInfoKind::None) { |
| DILineInfo Result; |
| Result.FunctionName = FunctionName; |
| Result.StartLine = StartLine; |
| Lines.push_back(std::make_pair(Address, Result)); |
| return Lines; |
| } |
| |
| const DWARFLineTable *LineTable = getLineTableForUnit(CU); |
| |
| // Get the index of row we're looking for in the line table. |
| std::vector<uint32_t> RowVector; |
| if (!LineTable->lookupAddressRange(Address, Size, RowVector)) |
| return Lines; |
| |
| for (uint32_t RowIndex : RowVector) { |
| // Take file number and line/column from the row. |
| const DWARFDebugLine::Row &Row = LineTable->Rows[RowIndex]; |
| DILineInfo Result; |
| LineTable->getFileNameByIndex(Row.File, CU->getCompilationDir(), |
| Spec.FLIKind, Result.FileName); |
| Result.FunctionName = FunctionName; |
| Result.Line = Row.Line; |
| Result.Column = Row.Column; |
| Result.StartLine = StartLine; |
| Lines.push_back(std::make_pair(Row.Address, Result)); |
| } |
| |
| return Lines; |
| } |
| |
| DIInliningInfo |
| DWARFContext::getInliningInfoForAddress(uint64_t Address, |
| DILineInfoSpecifier Spec) { |
| DIInliningInfo InliningInfo; |
| |
| DWARFCompileUnit *CU = getCompileUnitForAddress(Address); |
| if (!CU) |
| return InliningInfo; |
| |
| const DWARFLineTable *LineTable = nullptr; |
| SmallVector<DWARFDie, 4> InlinedChain; |
| CU->getInlinedChainForAddress(Address, InlinedChain); |
| if (InlinedChain.size() == 0) { |
| // If there is no DIE for address (e.g. it is in unavailable .dwo file), |
| // try to at least get file/line info from symbol table. |
| if (Spec.FLIKind != FileLineInfoKind::None) { |
| DILineInfo Frame; |
| LineTable = getLineTableForUnit(CU); |
| if (LineTable && |
| LineTable->getFileLineInfoForAddress(Address, CU->getCompilationDir(), |
| Spec.FLIKind, Frame)) |
| InliningInfo.addFrame(Frame); |
| } |
| return InliningInfo; |
| } |
| |
| uint32_t CallFile = 0, CallLine = 0, CallColumn = 0, CallDiscriminator = 0; |
| for (uint32_t i = 0, n = InlinedChain.size(); i != n; i++) { |
| DWARFDie &FunctionDIE = InlinedChain[i]; |
| DILineInfo Frame; |
| // Get function name if necessary. |
| if (const char *Name = FunctionDIE.getSubroutineName(Spec.FNKind)) |
| Frame.FunctionName = Name; |
| if (auto DeclLineResult = FunctionDIE.getDeclLine()) |
| Frame.StartLine = DeclLineResult; |
| if (Spec.FLIKind != FileLineInfoKind::None) { |
| if (i == 0) { |
| // For the topmost frame, initialize the line table of this |
| // compile unit and fetch file/line info from it. |
| LineTable = getLineTableForUnit(CU); |
| // For the topmost routine, get file/line info from line table. |
| if (LineTable) |
| LineTable->getFileLineInfoForAddress(Address, CU->getCompilationDir(), |
| Spec.FLIKind, Frame); |
| } else { |
| // Otherwise, use call file, call line and call column from |
| // previous DIE in inlined chain. |
| if (LineTable) |
| LineTable->getFileNameByIndex(CallFile, CU->getCompilationDir(), |
| Spec.FLIKind, Frame.FileName); |
| Frame.Line = CallLine; |
| Frame.Column = CallColumn; |
| Frame.Discriminator = CallDiscriminator; |
| } |
| // Get call file/line/column of a current DIE. |
| if (i + 1 < n) { |
| FunctionDIE.getCallerFrame(CallFile, CallLine, CallColumn, |
| CallDiscriminator); |
| } |
| } |
| InliningInfo.addFrame(Frame); |
| } |
| return InliningInfo; |
| } |
| |
| std::shared_ptr<DWARFContext> |
| DWARFContext::getDWOContext(StringRef AbsolutePath) { |
| if (auto S = DWP.lock()) { |
| DWARFContext *Ctxt = S->Context.get(); |
| return std::shared_ptr<DWARFContext>(std::move(S), Ctxt); |
| } |
| |
| std::weak_ptr<DWOFile> *Entry = &DWOFiles[AbsolutePath]; |
| |
| if (auto S = Entry->lock()) { |
| DWARFContext *Ctxt = S->Context.get(); |
| return std::shared_ptr<DWARFContext>(std::move(S), Ctxt); |
| } |
| |
| Expected<OwningBinary<ObjectFile>> Obj = [&] { |
| if (!CheckedForDWP) { |
| SmallString<128> DWPName; |
| auto Obj = object::ObjectFile::createObjectFile( |
| this->DWPName.empty() |
| ? (DObj->getFileName() + ".dwp").toStringRef(DWPName) |
| : StringRef(this->DWPName)); |
| if (Obj) { |
| Entry = &DWP; |
| return Obj; |
| } else { |
| CheckedForDWP = true; |
| // TODO: Should this error be handled (maybe in a high verbosity mode) |
| // before falling back to .dwo files? |
| consumeError(Obj.takeError()); |
| } |
| } |
| |
| return object::ObjectFile::createObjectFile(AbsolutePath); |
| }(); |
| |
| if (!Obj) { |
| // TODO: Actually report errors helpfully. |
| consumeError(Obj.takeError()); |
| return nullptr; |
| } |
| |
| auto S = std::make_shared<DWOFile>(); |
| S->File = std::move(Obj.get()); |
| S->Context = DWARFContext::create(*S->File.getBinary()); |
| *Entry = S; |
| auto *Ctxt = S->Context.get(); |
| return std::shared_ptr<DWARFContext>(std::move(S), Ctxt); |
| } |
| |
| static Error createError(const Twine &Reason, llvm::Error E) { |
| return make_error<StringError>(Reason + toString(std::move(E)), |
| inconvertibleErrorCode()); |
| } |
| |
| /// SymInfo contains information about symbol: it's address |
| /// and section index which is -1LL for absolute symbols. |
| struct SymInfo { |
| uint64_t Address; |
| uint64_t SectionIndex; |
| }; |
| |
| /// Returns the address of symbol relocation used against and a section index. |
| /// Used for futher relocations computation. Symbol's section load address is |
| static Expected<SymInfo> getSymbolInfo(const object::ObjectFile &Obj, |
| const RelocationRef &Reloc, |
| const LoadedObjectInfo *L, |
| std::map<SymbolRef, SymInfo> &Cache) { |
| SymInfo Ret = {0, (uint64_t)-1LL}; |
| object::section_iterator RSec = Obj.section_end(); |
| object::symbol_iterator Sym = Reloc.getSymbol(); |
| |
| std::map<SymbolRef, SymInfo>::iterator CacheIt = Cache.end(); |
| // First calculate the address of the symbol or section as it appears |
| // in the object file |
| if (Sym != Obj.symbol_end()) { |
| bool New; |
| std::tie(CacheIt, New) = Cache.insert({*Sym, {0, 0}}); |
| if (!New) |
| return CacheIt->second; |
| |
| Expected<uint64_t> SymAddrOrErr = Sym->getAddress(); |
| if (!SymAddrOrErr) |
| return createError("failed to compute symbol address: ", |
| SymAddrOrErr.takeError()); |
| |
| // Also remember what section this symbol is in for later |
| auto SectOrErr = Sym->getSection(); |
| if (!SectOrErr) |
| return createError("failed to get symbol section: ", |
| SectOrErr.takeError()); |
| |
| RSec = *SectOrErr; |
| Ret.Address = *SymAddrOrErr; |
| } else if (auto *MObj = dyn_cast<MachOObjectFile>(&Obj)) { |
| RSec = MObj->getRelocationSection(Reloc.getRawDataRefImpl()); |
| Ret.Address = RSec->getAddress(); |
| } |
| |
| if (RSec != Obj.section_end()) |
| Ret.SectionIndex = RSec->getIndex(); |
| |
| // If we are given load addresses for the sections, we need to adjust: |
| // SymAddr = (Address of Symbol Or Section in File) - |
| // (Address of Section in File) + |
| // (Load Address of Section) |
| // RSec is now either the section being targeted or the section |
| // containing the symbol being targeted. In either case, |
| // we need to perform the same computation. |
| if (L && RSec != Obj.section_end()) |
| if (uint64_t SectionLoadAddress = L->getSectionLoadAddress(*RSec)) |
| Ret.Address += SectionLoadAddress - RSec->getAddress(); |
| |
| if (CacheIt != Cache.end()) |
| CacheIt->second = Ret; |
| |
| return Ret; |
| } |
| |
| static bool isRelocScattered(const object::ObjectFile &Obj, |
| const RelocationRef &Reloc) { |
| const MachOObjectFile *MachObj = dyn_cast<MachOObjectFile>(&Obj); |
| if (!MachObj) |
| return false; |
| // MachO also has relocations that point to sections and |
| // scattered relocations. |
| auto RelocInfo = MachObj->getRelocation(Reloc.getRawDataRefImpl()); |
| return MachObj->isRelocationScattered(RelocInfo); |
| } |
| |
| ErrorPolicy DWARFContext::defaultErrorHandler(Error E) { |
| WithColor::error() << toString(std::move(E)) << '\n'; |
| return ErrorPolicy::Continue; |
| } |
| |
| namespace { |
| struct DWARFSectionMap final : public DWARFSection { |
| RelocAddrMap Relocs; |
| }; |
| |
| class DWARFObjInMemory final : public DWARFObject { |
| bool IsLittleEndian; |
| uint8_t AddressSize; |
| StringRef FileName; |
| const object::ObjectFile *Obj = nullptr; |
| std::vector<SectionName> SectionNames; |
| |
| using TypeSectionMap = MapVector<object::SectionRef, DWARFSectionMap, |
| std::map<object::SectionRef, unsigned>>; |
| |
| TypeSectionMap TypesSections; |
| TypeSectionMap TypesDWOSections; |
| |
| DWARFSectionMap InfoSection; |
| DWARFSectionMap LocSection; |
| DWARFSectionMap LineSection; |
| DWARFSectionMap RangeSection; |
| DWARFSectionMap RnglistsSection; |
| DWARFSectionMap StringOffsetSection; |
| DWARFSectionMap InfoDWOSection; |
| DWARFSectionMap LineDWOSection; |
| DWARFSectionMap LocDWOSection; |
| DWARFSectionMap StringOffsetDWOSection; |
| DWARFSectionMap RangeDWOSection; |
| DWARFSectionMap RnglistsDWOSection; |
| DWARFSectionMap AddrSection; |
| DWARFSectionMap AppleNamesSection; |
| DWARFSectionMap AppleTypesSection; |
| DWARFSectionMap AppleNamespacesSection; |
| DWARFSectionMap AppleObjCSection; |
| DWARFSectionMap DebugNamesSection; |
| |
| DWARFSectionMap *mapNameToDWARFSection(StringRef Name) { |
| return StringSwitch<DWARFSectionMap *>(Name) |
| .Case("debug_info", &InfoSection) |
| .Case("debug_loc", &LocSection) |
| .Case("debug_line", &LineSection) |
| .Case("debug_str_offsets", &StringOffsetSection) |
| .Case("debug_ranges", &RangeSection) |
| .Case("debug_rnglists", &RnglistsSection) |
| .Case("debug_info.dwo", &InfoDWOSection) |
| .Case("debug_loc.dwo", &LocDWOSection) |
| .Case("debug_line.dwo", &LineDWOSection) |
| .Case("debug_names", &DebugNamesSection) |
| .Case("debug_rnglists.dwo", &RnglistsDWOSection) |
| .Case("debug_str_offsets.dwo", &StringOffsetDWOSection) |
| .Case("debug_addr", &AddrSection) |
| .Case("apple_names", &AppleNamesSection) |
| .Case("apple_types", &AppleTypesSection) |
| .Case("apple_namespaces", &AppleNamespacesSection) |
| .Case("apple_namespac", &AppleNamespacesSection) |
| .Case("apple_objc", &AppleObjCSection) |
| .Default(nullptr); |
| } |
| |
| StringRef AbbrevSection; |
| StringRef ARangeSection; |
| StringRef DebugFrameSection; |
| StringRef EHFrameSection; |
| StringRef StringSection; |
| StringRef MacinfoSection; |
| StringRef PubNamesSection; |
| StringRef PubTypesSection; |
| StringRef GnuPubNamesSection; |
| StringRef AbbrevDWOSection; |
| StringRef StringDWOSection; |
| StringRef GnuPubTypesSection; |
| StringRef CUIndexSection; |
| StringRef GdbIndexSection; |
| StringRef TUIndexSection; |
| StringRef LineStringSection; |
| |
| // A deque holding section data whose iterators are not invalidated when |
| // new decompressed sections are inserted at the end. |
| std::deque<SmallString<0>> UncompressedSections; |
| |
| StringRef *mapSectionToMember(StringRef Name) { |
| if (DWARFSection *Sec = mapNameToDWARFSection(Name)) |
| return &Sec->Data; |
| return StringSwitch<StringRef *>(Name) |
| .Case("debug_abbrev", &AbbrevSection) |
| .Case("debug_aranges", &ARangeSection) |
| .Case("debug_frame", &DebugFrameSection) |
| .Case("eh_frame", &EHFrameSection) |
| .Case("debug_str", &StringSection) |
| .Case("debug_macinfo", &MacinfoSection) |
| .Case("debug_pubnames", &PubNamesSection) |
| .Case("debug_pubtypes", &PubTypesSection) |
| .Case("debug_gnu_pubnames", &GnuPubNamesSection) |
| .Case("debug_gnu_pubtypes", &GnuPubTypesSection) |
| .Case("debug_abbrev.dwo", &AbbrevDWOSection) |
| .Case("debug_str.dwo", &StringDWOSection) |
| .Case("debug_cu_index", &CUIndexSection) |
| .Case("debug_tu_index", &TUIndexSection) |
| .Case("gdb_index", &GdbIndexSection) |
| .Case("debug_line_str", &LineStringSection) |
| // Any more debug info sections go here. |
| .Default(nullptr); |
| } |
| |
| /// If Sec is compressed section, decompresses and updates its contents |
| /// provided by Data. Otherwise leaves it unchanged. |
| Error maybeDecompress(const object::SectionRef &Sec, StringRef Name, |
| StringRef &Data) { |
| if (!Decompressor::isCompressed(Sec)) |
| return Error::success(); |
| |
| Expected<Decompressor> Decompressor = |
| Decompressor::create(Name, Data, IsLittleEndian, AddressSize == 8); |
| if (!Decompressor) |
| return Decompressor.takeError(); |
| |
| SmallString<0> Out; |
| if (auto Err = Decompressor->resizeAndDecompress(Out)) |
| return Err; |
| |
| UncompressedSections.push_back(std::move(Out)); |
| Data = UncompressedSections.back(); |
| |
| return Error::success(); |
| } |
| |
| public: |
| DWARFObjInMemory(const StringMap<std::unique_ptr<MemoryBuffer>> &Sections, |
| uint8_t AddrSize, bool IsLittleEndian) |
| : IsLittleEndian(IsLittleEndian) { |
| for (const auto &SecIt : Sections) { |
| if (StringRef *SectionData = mapSectionToMember(SecIt.first())) |
| *SectionData = SecIt.second->getBuffer(); |
| } |
| } |
| DWARFObjInMemory(const object::ObjectFile &Obj, const LoadedObjectInfo *L, |
| function_ref<ErrorPolicy(Error)> HandleError) |
| : IsLittleEndian(Obj.isLittleEndian()), |
| AddressSize(Obj.getBytesInAddress()), FileName(Obj.getFileName()), |
| Obj(&Obj) { |
| |
| StringMap<unsigned> SectionAmountMap; |
| for (const SectionRef &Section : Obj.sections()) { |
| StringRef Name; |
| Section.getName(Name); |
| ++SectionAmountMap[Name]; |
| SectionNames.push_back({ Name, true }); |
| |
| // Skip BSS and Virtual sections, they aren't interesting. |
| if (Section.isBSS() || Section.isVirtual()) |
| continue; |
| |
| // Skip sections stripped by dsymutil. |
| if (Section.isStripped()) |
| continue; |
| |
| StringRef Data; |
| section_iterator RelocatedSection = Section.getRelocatedSection(); |
| // Try to obtain an already relocated version of this section. |
| // Else use the unrelocated section from the object file. We'll have to |
| // apply relocations ourselves later. |
| if (!L || !L->getLoadedSectionContents(*RelocatedSection, Data)) |
| Section.getContents(Data); |
| |
| if (auto Err = maybeDecompress(Section, Name, Data)) { |
| ErrorPolicy EP = HandleError(createError( |
| "failed to decompress '" + Name + "', ", std::move(Err))); |
| if (EP == ErrorPolicy::Halt) |
| return; |
| continue; |
| } |
| |
| // Compressed sections names in GNU style starts from ".z", |
| // at this point section is decompressed and we drop compression prefix. |
| Name = Name.substr( |
| Name.find_first_not_of("._z")); // Skip ".", "z" and "_" prefixes. |
| |
| // Map platform specific debug section names to DWARF standard section |
| // names. |
| Name = Obj.mapDebugSectionName(Name); |
| |
| if (StringRef *SectionData = mapSectionToMember(Name)) { |
| *SectionData = Data; |
| if (Name == "debug_ranges") { |
| // FIXME: Use the other dwo range section when we emit it. |
| RangeDWOSection.Data = Data; |
| } |
| } else if (Name == "debug_types") { |
| // Find debug_types data by section rather than name as there are |
| // multiple, comdat grouped, debug_types sections. |
| TypesSections[Section].Data = Data; |
| } else if (Name == "debug_types.dwo") { |
| TypesDWOSections[Section].Data = Data; |
| } |
| |
| if (RelocatedSection == Obj.section_end()) |
| continue; |
| |
| StringRef RelSecName; |
| StringRef RelSecData; |
| RelocatedSection->getName(RelSecName); |
| |
| // If the section we're relocating was relocated already by the JIT, |
| // then we used the relocated version above, so we do not need to process |
| // relocations for it now. |
| if (L && L->getLoadedSectionContents(*RelocatedSection, RelSecData)) |
| continue; |
| |
| // In Mach-o files, the relocations do not need to be applied if |
| // there is no load offset to apply. The value read at the |
| // relocation point already factors in the section address |
| // (actually applying the relocations will produce wrong results |
| // as the section address will be added twice). |
| if (!L && isa<MachOObjectFile>(&Obj)) |
| continue; |
| |
| RelSecName = RelSecName.substr( |
| RelSecName.find_first_not_of("._z")); // Skip . and _ prefixes. |
| |
| // TODO: Add support for relocations in other sections as needed. |
| // Record relocations for the debug_info and debug_line sections. |
| DWARFSectionMap *Sec = mapNameToDWARFSection(RelSecName); |
| RelocAddrMap *Map = Sec ? &Sec->Relocs : nullptr; |
| if (!Map) { |
| // Find debug_types relocs by section rather than name as there are |
| // multiple, comdat grouped, debug_types sections. |
| if (RelSecName == "debug_types") |
| Map = |
| &static_cast<DWARFSectionMap &>(TypesSections[*RelocatedSection]) |
| .Relocs; |
| else if (RelSecName == "debug_types.dwo") |
| Map = &static_cast<DWARFSectionMap &>( |
| TypesDWOSections[*RelocatedSection]) |
| .Relocs; |
| else |
| continue; |
| } |
| |
| if (Section.relocation_begin() == Section.relocation_end()) |
| continue; |
| |
| // Symbol to [address, section index] cache mapping. |
| std::map<SymbolRef, SymInfo> AddrCache; |
| for (const RelocationRef &Reloc : Section.relocations()) { |
| // FIXME: it's not clear how to correctly handle scattered |
| // relocations. |
| if (isRelocScattered(Obj, Reloc)) |
| continue; |
| |
| Expected<SymInfo> SymInfoOrErr = |
| getSymbolInfo(Obj, Reloc, L, AddrCache); |
| if (!SymInfoOrErr) { |
| if (HandleError(SymInfoOrErr.takeError()) == ErrorPolicy::Halt) |
| return; |
| continue; |
| } |
| |
| object::RelocVisitor V(Obj); |
| uint64_t Val = V.visit(Reloc.getType(), Reloc, SymInfoOrErr->Address); |
| if (V.error()) { |
| SmallString<32> Type; |
| Reloc.getTypeName(Type); |
| ErrorPolicy EP = HandleError( |
| createError("failed to compute relocation: " + Type + ", ", |
| errorCodeToError(object_error::parse_failed))); |
| if (EP == ErrorPolicy::Halt) |
| return; |
| continue; |
| } |
| RelocAddrEntry Rel = {SymInfoOrErr->SectionIndex, Val}; |
| Map->insert({Reloc.getOffset(), Rel}); |
| } |
| } |
| |
| for (SectionName &S : SectionNames) |
| if (SectionAmountMap[S.Name] > 1) |
| S.IsNameUnique = false; |
| } |
| |
| Optional<RelocAddrEntry> find(const DWARFSection &S, |
| uint64_t Pos) const override { |
| auto &Sec = static_cast<const DWARFSectionMap &>(S); |
| RelocAddrMap::const_iterator AI = Sec.Relocs.find(Pos); |
| if (AI == Sec.Relocs.end()) |
| return None; |
| return AI->second; |
| } |
| |
| const object::ObjectFile *getFile() const override { return Obj; } |
| |
| ArrayRef<SectionName> getSectionNames() const override { |
| return SectionNames; |
| } |
| |
| bool isLittleEndian() const override { return IsLittleEndian; } |
| StringRef getAbbrevDWOSection() const override { return AbbrevDWOSection; } |
| const DWARFSection &getLineDWOSection() const override { |
| return LineDWOSection; |
| } |
| const DWARFSection &getLocDWOSection() const override { |
| return LocDWOSection; |
| } |
| StringRef getStringDWOSection() const override { return StringDWOSection; } |
| const DWARFSection &getStringOffsetDWOSection() const override { |
| return StringOffsetDWOSection; |
| } |
| const DWARFSection &getRangeDWOSection() const override { |
| return RangeDWOSection; |
| } |
| const DWARFSection &getRnglistsDWOSection() const override { |
| return RnglistsDWOSection; |
| } |
| const DWARFSection &getAddrSection() const override { return AddrSection; } |
| StringRef getCUIndexSection() const override { return CUIndexSection; } |
| StringRef getGdbIndexSection() const override { return GdbIndexSection; } |
| StringRef getTUIndexSection() const override { return TUIndexSection; } |
| |
| // DWARF v5 |
| const DWARFSection &getStringOffsetSection() const override { |
| return StringOffsetSection; |
| } |
| StringRef getLineStringSection() const override { return LineStringSection; } |
| |
| // Sections for DWARF5 split dwarf proposal. |
| const DWARFSection &getInfoDWOSection() const override { |
| return InfoDWOSection; |
| } |
| void forEachTypesDWOSections( |
| function_ref<void(const DWARFSection &)> F) const override { |
| for (auto &P : TypesDWOSections) |
| F(P.second); |
| } |
| |
| StringRef getAbbrevSection() const override { return AbbrevSection; } |
| const DWARFSection &getLocSection() const override { return LocSection; } |
| StringRef getARangeSection() const override { return ARangeSection; } |
| StringRef getDebugFrameSection() const override { return DebugFrameSection; } |
| StringRef getEHFrameSection() const override { return EHFrameSection; } |
| const DWARFSection &getLineSection() const override { return LineSection; } |
| StringRef getStringSection() const override { return StringSection; } |
| const DWARFSection &getRangeSection() const override { return RangeSection; } |
| const DWARFSection &getRnglistsSection() const override { |
| return RnglistsSection; |
| } |
| StringRef getMacinfoSection() const override { return MacinfoSection; } |
| StringRef getPubNamesSection() const override { return PubNamesSection; } |
| StringRef getPubTypesSection() const override { return PubTypesSection; } |
| StringRef getGnuPubNamesSection() const override { |
| return GnuPubNamesSection; |
| } |
| StringRef getGnuPubTypesSection() const override { |
| return GnuPubTypesSection; |
| } |
| const DWARFSection &getAppleNamesSection() const override { |
| return AppleNamesSection; |
| } |
| const DWARFSection &getAppleTypesSection() const override { |
| return AppleTypesSection; |
| } |
| const DWARFSection &getAppleNamespacesSection() const override { |
| return AppleNamespacesSection; |
| } |
| const DWARFSection &getAppleObjCSection() const override { |
| return AppleObjCSection; |
| } |
| const DWARFSection &getDebugNamesSection() const override { |
| return DebugNamesSection; |
| } |
| |
| StringRef getFileName() const override { return FileName; } |
| uint8_t getAddressSize() const override { return AddressSize; } |
| const DWARFSection &getInfoSection() const override { return InfoSection; } |
| void forEachTypesSections( |
| function_ref<void(const DWARFSection &)> F) const override { |
| for (auto &P : TypesSections) |
| F(P.second); |
| } |
| }; |
| } // namespace |
| |
| std::unique_ptr<DWARFContext> |
| DWARFContext::create(const object::ObjectFile &Obj, const LoadedObjectInfo *L, |
| function_ref<ErrorPolicy(Error)> HandleError, |
| std::string DWPName) { |
| auto DObj = llvm::make_unique<DWARFObjInMemory>(Obj, L, HandleError); |
| return llvm::make_unique<DWARFContext>(std::move(DObj), std::move(DWPName)); |
| } |
| |
| std::unique_ptr<DWARFContext> |
| DWARFContext::create(const StringMap<std::unique_ptr<MemoryBuffer>> &Sections, |
| uint8_t AddrSize, bool isLittleEndian) { |
| auto DObj = |
| llvm::make_unique<DWARFObjInMemory>(Sections, AddrSize, isLittleEndian); |
| return llvm::make_unique<DWARFContext>(std::move(DObj), ""); |
| } |
| |
| Error DWARFContext::loadRegisterInfo(const object::ObjectFile &Obj) { |
| // Detect the architecture from the object file. We usually don't need OS |
| // info to lookup a target and create register info. |
| Triple TT; |
| TT.setArch(Triple::ArchType(Obj.getArch())); |
| TT.setVendor(Triple::UnknownVendor); |
| TT.setOS(Triple::UnknownOS); |
| std::string TargetLookupError; |
| const Target *TheTarget = |
| TargetRegistry::lookupTarget(TT.str(), TargetLookupError); |
| if (!TargetLookupError.empty()) |
| return make_error<StringError>(TargetLookupError, inconvertibleErrorCode()); |
| RegInfo.reset(TheTarget->createMCRegInfo(TT.str())); |
| return Error::success(); |
| } |
| |
| uint8_t DWARFContext::getCUAddrSize() { |
| // In theory, different compile units may have different address byte |
| // sizes, but for simplicity we just use the address byte size of the |
| // last compile unit. In practice the address size field is repeated across |
| // various DWARF headers (at least in version 5) to make it easier to dump |
| // them independently, not to enable varying the address size. |
| uint8_t Addr = 0; |
| for (const auto &CU : compile_units()) { |
| Addr = CU->getAddressByteSize(); |
| break; |
| } |
| return Addr; |
| } |
