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a827bbdfea
This is follow up to https://reviews.llvm.org/D106198 where llvm-dwp was refactored in to multiple files. In this patch moving them in to lib/include directories. Reviewed By: dblaikie Differential Revision: https://reviews.llvm.org/D106493
811 lines
30 KiB
C++
811 lines
30 KiB
C++
//===-- llvm-dwp.cpp - Split DWARF merging tool for llvm ------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// A utility for merging DWARF 5 Split DWARF .dwo files into .dwp (DWARF
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// package files).
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/DWP/DWP.h"
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#include "llvm/DWP/DWPError.h"
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#include "llvm/MC/MCContext.h"
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#include "llvm/MC/MCObjectFileInfo.h"
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#include "llvm/MC/MCTargetOptionsCommandFlags.h"
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#include "llvm/Object/Decompressor.h"
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using namespace llvm;
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using namespace llvm::object;
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static mc::RegisterMCTargetOptionsFlags MCTargetOptionsFlags;
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// Returns the size of debug_str_offsets section headers in bytes.
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static uint64_t debugStrOffsetsHeaderSize(DataExtractor StrOffsetsData,
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uint16_t DwarfVersion) {
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if (DwarfVersion <= 4)
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return 0; // There is no header before dwarf 5.
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uint64_t Offset = 0;
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uint64_t Length = StrOffsetsData.getU32(&Offset);
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if (Length == llvm::dwarf::DW_LENGTH_DWARF64)
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return 16; // unit length: 12 bytes, version: 2 bytes, padding: 2 bytes.
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return 8; // unit length: 4 bytes, version: 2 bytes, padding: 2 bytes.
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}
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static uint64_t getCUAbbrev(StringRef Abbrev, uint64_t AbbrCode) {
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uint64_t Offset = 0;
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DataExtractor AbbrevData(Abbrev, true, 0);
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while (AbbrevData.getULEB128(&Offset) != AbbrCode) {
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// Tag
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AbbrevData.getULEB128(&Offset);
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// DW_CHILDREN
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AbbrevData.getU8(&Offset);
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// Attributes
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while (AbbrevData.getULEB128(&Offset) | AbbrevData.getULEB128(&Offset))
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;
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}
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return Offset;
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}
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static Expected<const char *>
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getIndexedString(dwarf::Form Form, DataExtractor InfoData, uint64_t &InfoOffset,
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StringRef StrOffsets, StringRef Str, uint16_t Version) {
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if (Form == dwarf::DW_FORM_string)
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return InfoData.getCStr(&InfoOffset);
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uint64_t StrIndex;
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switch (Form) {
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case dwarf::DW_FORM_strx1:
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StrIndex = InfoData.getU8(&InfoOffset);
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break;
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case dwarf::DW_FORM_strx2:
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StrIndex = InfoData.getU16(&InfoOffset);
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break;
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case dwarf::DW_FORM_strx3:
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StrIndex = InfoData.getU24(&InfoOffset);
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break;
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case dwarf::DW_FORM_strx4:
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StrIndex = InfoData.getU32(&InfoOffset);
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break;
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case dwarf::DW_FORM_strx:
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case dwarf::DW_FORM_GNU_str_index:
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StrIndex = InfoData.getULEB128(&InfoOffset);
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break;
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default:
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return make_error<DWPError>(
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"string field must be encoded with one of the following: "
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"DW_FORM_string, DW_FORM_strx, DW_FORM_strx1, DW_FORM_strx2, "
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"DW_FORM_strx3, DW_FORM_strx4, or DW_FORM_GNU_str_index.");
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}
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DataExtractor StrOffsetsData(StrOffsets, true, 0);
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uint64_t StrOffsetsOffset = 4 * StrIndex;
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StrOffsetsOffset += debugStrOffsetsHeaderSize(StrOffsetsData, Version);
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uint64_t StrOffset = StrOffsetsData.getU32(&StrOffsetsOffset);
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DataExtractor StrData(Str, true, 0);
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return StrData.getCStr(&StrOffset);
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}
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static Expected<CompileUnitIdentifiers>
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getCUIdentifiers(InfoSectionUnitHeader &Header, StringRef Abbrev,
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StringRef Info, StringRef StrOffsets, StringRef Str) {
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DataExtractor InfoData(Info, true, 0);
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uint64_t Offset = Header.HeaderSize;
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if (Header.Version >= 5 && Header.UnitType != dwarf::DW_UT_split_compile)
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return make_error<DWPError>(
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std::string("unit type DW_UT_split_compile type not found in "
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"debug_info header. Unexpected unit type 0x" +
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utostr(Header.UnitType) + " found"));
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CompileUnitIdentifiers ID;
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uint32_t AbbrCode = InfoData.getULEB128(&Offset);
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DataExtractor AbbrevData(Abbrev, true, 0);
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uint64_t AbbrevOffset = getCUAbbrev(Abbrev, AbbrCode);
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auto Tag = static_cast<dwarf::Tag>(AbbrevData.getULEB128(&AbbrevOffset));
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if (Tag != dwarf::DW_TAG_compile_unit)
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return make_error<DWPError>("top level DIE is not a compile unit");
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// DW_CHILDREN
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AbbrevData.getU8(&AbbrevOffset);
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uint32_t Name;
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dwarf::Form Form;
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while ((Name = AbbrevData.getULEB128(&AbbrevOffset)) |
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(Form = static_cast<dwarf::Form>(
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AbbrevData.getULEB128(&AbbrevOffset))) &&
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(Name != 0 || Form != 0)) {
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switch (Name) {
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case dwarf::DW_AT_name: {
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Expected<const char *> EName = getIndexedString(
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Form, InfoData, Offset, StrOffsets, Str, Header.Version);
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if (!EName)
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return EName.takeError();
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ID.Name = *EName;
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break;
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}
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case dwarf::DW_AT_GNU_dwo_name:
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case dwarf::DW_AT_dwo_name: {
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Expected<const char *> EName = getIndexedString(
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Form, InfoData, Offset, StrOffsets, Str, Header.Version);
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if (!EName)
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return EName.takeError();
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ID.DWOName = *EName;
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break;
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}
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case dwarf::DW_AT_GNU_dwo_id:
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Header.Signature = InfoData.getU64(&Offset);
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break;
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default:
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DWARFFormValue::skipValue(
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Form, InfoData, &Offset,
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dwarf::FormParams({Header.Version, Header.AddrSize, Header.Format}));
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}
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}
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if (!Header.Signature)
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return make_error<DWPError>("compile unit missing dwo_id");
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ID.Signature = *Header.Signature;
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return ID;
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}
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static bool isSupportedSectionKind(DWARFSectionKind Kind) {
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return Kind != DW_SECT_EXT_unknown;
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}
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namespace llvm {
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// Convert an internal section identifier into the index to use with
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// UnitIndexEntry::Contributions.
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unsigned getContributionIndex(DWARFSectionKind Kind, uint32_t IndexVersion) {
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assert(serializeSectionKind(Kind, IndexVersion) >= DW_SECT_INFO);
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return serializeSectionKind(Kind, IndexVersion) - DW_SECT_INFO;
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}
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} // namespace llvm
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// Convert a UnitIndexEntry::Contributions index to the corresponding on-disk
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// value of the section identifier.
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static unsigned getOnDiskSectionId(unsigned Index) {
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return Index + DW_SECT_INFO;
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}
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static StringRef getSubsection(StringRef Section,
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const DWARFUnitIndex::Entry &Entry,
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DWARFSectionKind Kind) {
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const auto *Off = Entry.getContribution(Kind);
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if (!Off)
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return StringRef();
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return Section.substr(Off->Offset, Off->Length);
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}
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static void
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addAllTypesFromDWP(MCStreamer &Out,
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MapVector<uint64_t, UnitIndexEntry> &TypeIndexEntries,
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const DWARFUnitIndex &TUIndex, MCSection *OutputTypes,
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StringRef Types, const UnitIndexEntry &TUEntry,
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uint32_t &TypesOffset, unsigned TypesContributionIndex) {
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Out.SwitchSection(OutputTypes);
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for (const DWARFUnitIndex::Entry &E : TUIndex.getRows()) {
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auto *I = E.getContributions();
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if (!I)
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continue;
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auto P = TypeIndexEntries.insert(std::make_pair(E.getSignature(), TUEntry));
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if (!P.second)
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continue;
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auto &Entry = P.first->second;
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// Zero out the debug_info contribution
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Entry.Contributions[0] = {};
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for (auto Kind : TUIndex.getColumnKinds()) {
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if (!isSupportedSectionKind(Kind))
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continue;
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auto &C =
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Entry.Contributions[getContributionIndex(Kind, TUIndex.getVersion())];
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C.Offset += I->Offset;
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C.Length = I->Length;
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++I;
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}
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auto &C = Entry.Contributions[TypesContributionIndex];
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Out.emitBytes(Types.substr(
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C.Offset - TUEntry.Contributions[TypesContributionIndex].Offset,
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C.Length));
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C.Offset = TypesOffset;
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TypesOffset += C.Length;
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}
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}
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static void addAllTypesFromTypesSection(
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MCStreamer &Out, MapVector<uint64_t, UnitIndexEntry> &TypeIndexEntries,
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MCSection *OutputTypes, const std::vector<StringRef> &TypesSections,
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const UnitIndexEntry &CUEntry, uint32_t &TypesOffset) {
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for (StringRef Types : TypesSections) {
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Out.SwitchSection(OutputTypes);
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uint64_t Offset = 0;
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DataExtractor Data(Types, true, 0);
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while (Data.isValidOffset(Offset)) {
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UnitIndexEntry Entry = CUEntry;
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// Zero out the debug_info contribution
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Entry.Contributions[0] = {};
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auto &C = Entry.Contributions[getContributionIndex(DW_SECT_EXT_TYPES, 2)];
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C.Offset = TypesOffset;
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auto PrevOffset = Offset;
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// Length of the unit, including the 4 byte length field.
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C.Length = Data.getU32(&Offset) + 4;
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Data.getU16(&Offset); // Version
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Data.getU32(&Offset); // Abbrev offset
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Data.getU8(&Offset); // Address size
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auto Signature = Data.getU64(&Offset);
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Offset = PrevOffset + C.Length;
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auto P = TypeIndexEntries.insert(std::make_pair(Signature, Entry));
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if (!P.second)
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continue;
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Out.emitBytes(Types.substr(PrevOffset, C.Length));
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TypesOffset += C.Length;
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}
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}
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}
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static std::string buildDWODescription(StringRef Name, StringRef DWPName,
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StringRef DWOName) {
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std::string Text = "\'";
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Text += Name;
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Text += '\'';
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if (!DWPName.empty()) {
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Text += " (from ";
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if (!DWOName.empty()) {
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Text += '\'';
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Text += DWOName;
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Text += "' in ";
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}
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Text += '\'';
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Text += DWPName;
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Text += "')";
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}
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return Text;
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}
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static Error createError(StringRef Name, Error E) {
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return make_error<DWPError>(
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("failure while decompressing compressed section: '" + Name + "', " +
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llvm::toString(std::move(E)))
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.str());
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}
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static Error
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handleCompressedSection(std::deque<SmallString<32>> &UncompressedSections,
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StringRef &Name, StringRef &Contents) {
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if (!Decompressor::isGnuStyle(Name))
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return Error::success();
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Expected<Decompressor> Dec =
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Decompressor::create(Name, Contents, false /*IsLE*/, false /*Is64Bit*/);
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if (!Dec)
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return createError(Name, Dec.takeError());
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UncompressedSections.emplace_back();
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if (Error E = Dec->resizeAndDecompress(UncompressedSections.back()))
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return createError(Name, std::move(E));
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Name = Name.substr(2); // Drop ".z"
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Contents = UncompressedSections.back();
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return Error::success();
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}
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namespace llvm {
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// Parse and return the header of an info section compile/type unit.
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Expected<InfoSectionUnitHeader> parseInfoSectionUnitHeader(StringRef Info) {
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InfoSectionUnitHeader Header;
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Error Err = Error::success();
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uint64_t Offset = 0;
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DWARFDataExtractor InfoData(Info, true, 0);
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std::tie(Header.Length, Header.Format) =
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InfoData.getInitialLength(&Offset, &Err);
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if (Err)
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return make_error<DWPError>("cannot parse compile unit length: " +
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llvm::toString(std::move(Err)));
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if (!InfoData.isValidOffset(Offset + (Header.Length - 1))) {
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return make_error<DWPError>(
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"compile unit exceeds .debug_info section range: " +
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utostr(Offset + Header.Length) + " >= " + utostr(InfoData.size()));
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}
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Header.Version = InfoData.getU16(&Offset, &Err);
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if (Err)
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return make_error<DWPError>("cannot parse compile unit version: " +
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llvm::toString(std::move(Err)));
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uint64_t MinHeaderLength;
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if (Header.Version >= 5) {
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// Size: Version (2), UnitType (1), AddrSize (1), DebugAbbrevOffset (4),
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// Signature (8)
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MinHeaderLength = 16;
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} else {
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// Size: Version (2), DebugAbbrevOffset (4), AddrSize (1)
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MinHeaderLength = 7;
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}
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if (Header.Length < MinHeaderLength) {
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return make_error<DWPError>("unit length is too small: expected at least " +
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utostr(MinHeaderLength) + " got " +
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utostr(Header.Length) + ".");
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}
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if (Header.Version >= 5) {
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Header.UnitType = InfoData.getU8(&Offset);
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Header.AddrSize = InfoData.getU8(&Offset);
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Header.DebugAbbrevOffset = InfoData.getU32(&Offset);
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Header.Signature = InfoData.getU64(&Offset);
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if (Header.UnitType == dwarf::DW_UT_split_type) {
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// Type offset.
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MinHeaderLength += 4;
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if (Header.Length < MinHeaderLength)
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return make_error<DWPError>("type unit is missing type offset");
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InfoData.getU32(&Offset);
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}
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} else {
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// Note that, address_size and debug_abbrev_offset fields have switched
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// places between dwarf version 4 and 5.
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Header.DebugAbbrevOffset = InfoData.getU32(&Offset);
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Header.AddrSize = InfoData.getU8(&Offset);
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}
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Header.HeaderSize = Offset;
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return Header;
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}
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void writeStringsAndOffsets(MCStreamer &Out, DWPStringPool &Strings,
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MCSection *StrOffsetSection,
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StringRef CurStrSection,
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StringRef CurStrOffsetSection, uint16_t Version) {
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// Could possibly produce an error or warning if one of these was non-null but
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// the other was null.
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if (CurStrSection.empty() || CurStrOffsetSection.empty())
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return;
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DenseMap<uint64_t, uint32_t> OffsetRemapping;
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DataExtractor Data(CurStrSection, true, 0);
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uint64_t LocalOffset = 0;
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uint64_t PrevOffset = 0;
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while (const char *S = Data.getCStr(&LocalOffset)) {
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OffsetRemapping[PrevOffset] =
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Strings.getOffset(S, LocalOffset - PrevOffset);
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PrevOffset = LocalOffset;
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}
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Data = DataExtractor(CurStrOffsetSection, true, 0);
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Out.SwitchSection(StrOffsetSection);
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uint64_t HeaderSize = debugStrOffsetsHeaderSize(Data, Version);
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uint64_t Offset = 0;
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uint64_t Size = CurStrOffsetSection.size();
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// FIXME: This can be caused by bad input and should be handled as such.
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assert(HeaderSize <= Size && "StrOffsetSection size is less than its header");
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// Copy the header to the output.
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Out.emitBytes(Data.getBytes(&Offset, HeaderSize));
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while (Offset < Size) {
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auto OldOffset = Data.getU32(&Offset);
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auto NewOffset = OffsetRemapping[OldOffset];
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Out.emitIntValue(NewOffset, 4);
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}
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}
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void writeIndexTable(
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MCStreamer &Out, ArrayRef<unsigned> ContributionOffsets,
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const MapVector<uint64_t, UnitIndexEntry> &IndexEntries,
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uint32_t DWARFUnitIndex::Entry::SectionContribution::*Field) {
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for (const auto &E : IndexEntries)
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for (size_t I = 0; I != array_lengthof(E.second.Contributions); ++I)
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if (ContributionOffsets[I])
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Out.emitIntValue(E.second.Contributions[I].*Field, 4);
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}
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void writeIndex(MCStreamer &Out, MCSection *Section,
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ArrayRef<unsigned> ContributionOffsets,
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const MapVector<uint64_t, UnitIndexEntry> &IndexEntries,
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uint32_t IndexVersion) {
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if (IndexEntries.empty())
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return;
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unsigned Columns = 0;
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for (auto &C : ContributionOffsets)
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if (C)
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++Columns;
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std::vector<unsigned> Buckets(NextPowerOf2(3 * IndexEntries.size() / 2));
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uint64_t Mask = Buckets.size() - 1;
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size_t I = 0;
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for (const auto &P : IndexEntries) {
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auto S = P.first;
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auto H = S & Mask;
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auto HP = ((S >> 32) & Mask) | 1;
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while (Buckets[H]) {
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assert(S != IndexEntries.begin()[Buckets[H] - 1].first &&
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"Duplicate unit");
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H = (H + HP) & Mask;
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}
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Buckets[H] = I + 1;
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++I;
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}
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Out.SwitchSection(Section);
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Out.emitIntValue(IndexVersion, 4); // Version
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Out.emitIntValue(Columns, 4); // Columns
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Out.emitIntValue(IndexEntries.size(), 4); // Num Units
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Out.emitIntValue(Buckets.size(), 4); // Num Buckets
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// Write the signatures.
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for (const auto &I : Buckets)
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Out.emitIntValue(I ? IndexEntries.begin()[I - 1].first : 0, 8);
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// Write the indexes.
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for (const auto &I : Buckets)
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Out.emitIntValue(I, 4);
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// Write the column headers (which sections will appear in the table)
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for (size_t I = 0; I != ContributionOffsets.size(); ++I)
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if (ContributionOffsets[I])
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Out.emitIntValue(getOnDiskSectionId(I), 4);
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// Write the offsets.
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writeIndexTable(Out, ContributionOffsets, IndexEntries,
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&DWARFUnitIndex::Entry::SectionContribution::Offset);
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// Write the lengths.
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writeIndexTable(Out, ContributionOffsets, IndexEntries,
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&DWARFUnitIndex::Entry::SectionContribution::Length);
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}
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Error buildDuplicateError(const std::pair<uint64_t, UnitIndexEntry> &PrevE,
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const CompileUnitIdentifiers &ID, StringRef DWPName) {
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return make_error<DWPError>(
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std::string("duplicate DWO ID (") + utohexstr(PrevE.first) + ") in " +
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buildDWODescription(PrevE.second.Name, PrevE.second.DWPName,
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PrevE.second.DWOName) +
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" and " + buildDWODescription(ID.Name, DWPName, ID.DWOName));
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}
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Error handleSection(
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const StringMap<std::pair<MCSection *, DWARFSectionKind>> &KnownSections,
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const MCSection *StrSection, const MCSection *StrOffsetSection,
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const MCSection *TypesSection, const MCSection *CUIndexSection,
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const MCSection *TUIndexSection, const MCSection *InfoSection,
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const SectionRef &Section, MCStreamer &Out,
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std::deque<SmallString<32>> &UncompressedSections,
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uint32_t (&ContributionOffsets)[8], UnitIndexEntry &CurEntry,
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StringRef &CurStrSection, StringRef &CurStrOffsetSection,
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std::vector<StringRef> &CurTypesSection,
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std::vector<StringRef> &CurInfoSection, StringRef &AbbrevSection,
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StringRef &CurCUIndexSection, StringRef &CurTUIndexSection,
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std::vector<std::pair<DWARFSectionKind, uint32_t>> &SectionLength) {
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if (Section.isBSS())
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return Error::success();
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|
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if (Section.isVirtual())
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return Error::success();
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Expected<StringRef> NameOrErr = Section.getName();
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if (!NameOrErr)
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return NameOrErr.takeError();
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StringRef Name = *NameOrErr;
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Expected<StringRef> ContentsOrErr = Section.getContents();
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if (!ContentsOrErr)
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return ContentsOrErr.takeError();
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StringRef Contents = *ContentsOrErr;
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if (auto Err = handleCompressedSection(UncompressedSections, Name, Contents))
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return Err;
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Name = Name.substr(Name.find_first_not_of("._"));
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auto SectionPair = KnownSections.find(Name);
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if (SectionPair == KnownSections.end())
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return Error::success();
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if (DWARFSectionKind Kind = SectionPair->second.second) {
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if (Kind != DW_SECT_EXT_TYPES && Kind != DW_SECT_INFO) {
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SectionLength.push_back(std::make_pair(Kind, Contents.size()));
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}
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|
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if (Kind == DW_SECT_ABBREV) {
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AbbrevSection = Contents;
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}
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}
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MCSection *OutSection = SectionPair->second.first;
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if (OutSection == StrOffsetSection)
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CurStrOffsetSection = Contents;
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else if (OutSection == StrSection)
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CurStrSection = Contents;
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else if (OutSection == TypesSection)
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CurTypesSection.push_back(Contents);
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else if (OutSection == CUIndexSection)
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CurCUIndexSection = Contents;
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else if (OutSection == TUIndexSection)
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CurTUIndexSection = Contents;
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else if (OutSection == InfoSection)
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CurInfoSection.push_back(Contents);
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else {
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Out.SwitchSection(OutSection);
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Out.emitBytes(Contents);
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}
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return Error::success();
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}
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Error write(MCStreamer &Out, ArrayRef<std::string> Inputs) {
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const auto &MCOFI = *Out.getContext().getObjectFileInfo();
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MCSection *const StrSection = MCOFI.getDwarfStrDWOSection();
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MCSection *const StrOffsetSection = MCOFI.getDwarfStrOffDWOSection();
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MCSection *const TypesSection = MCOFI.getDwarfTypesDWOSection();
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MCSection *const CUIndexSection = MCOFI.getDwarfCUIndexSection();
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MCSection *const TUIndexSection = MCOFI.getDwarfTUIndexSection();
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MCSection *const InfoSection = MCOFI.getDwarfInfoDWOSection();
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const StringMap<std::pair<MCSection *, DWARFSectionKind>> KnownSections = {
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{"debug_info.dwo", {InfoSection, DW_SECT_INFO}},
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{"debug_types.dwo", {MCOFI.getDwarfTypesDWOSection(), DW_SECT_EXT_TYPES}},
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{"debug_str_offsets.dwo", {StrOffsetSection, DW_SECT_STR_OFFSETS}},
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{"debug_str.dwo", {StrSection, static_cast<DWARFSectionKind>(0)}},
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{"debug_loc.dwo", {MCOFI.getDwarfLocDWOSection(), DW_SECT_EXT_LOC}},
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{"debug_line.dwo", {MCOFI.getDwarfLineDWOSection(), DW_SECT_LINE}},
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{"debug_macro.dwo", {MCOFI.getDwarfMacroDWOSection(), DW_SECT_MACRO}},
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{"debug_abbrev.dwo", {MCOFI.getDwarfAbbrevDWOSection(), DW_SECT_ABBREV}},
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{"debug_loclists.dwo",
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{MCOFI.getDwarfLoclistsDWOSection(), DW_SECT_LOCLISTS}},
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{"debug_rnglists.dwo",
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{MCOFI.getDwarfRnglistsDWOSection(), DW_SECT_RNGLISTS}},
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{"debug_cu_index", {CUIndexSection, static_cast<DWARFSectionKind>(0)}},
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{"debug_tu_index", {TUIndexSection, static_cast<DWARFSectionKind>(0)}}};
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|
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MapVector<uint64_t, UnitIndexEntry> IndexEntries;
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MapVector<uint64_t, UnitIndexEntry> TypeIndexEntries;
|
|
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uint32_t ContributionOffsets[8] = {};
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uint16_t Version = 0;
|
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uint32_t IndexVersion = 0;
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|
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DWPStringPool Strings(Out, StrSection);
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|
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SmallVector<OwningBinary<object::ObjectFile>, 128> Objects;
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Objects.reserve(Inputs.size());
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|
|
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std::deque<SmallString<32>> UncompressedSections;
|
|
|
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for (const auto &Input : Inputs) {
|
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auto ErrOrObj = object::ObjectFile::createObjectFile(Input);
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|
if (!ErrOrObj)
|
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return ErrOrObj.takeError();
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|
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auto &Obj = *ErrOrObj->getBinary();
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Objects.push_back(std::move(*ErrOrObj));
|
|
|
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UnitIndexEntry CurEntry = {};
|
|
|
|
StringRef CurStrSection;
|
|
StringRef CurStrOffsetSection;
|
|
std::vector<StringRef> CurTypesSection;
|
|
std::vector<StringRef> CurInfoSection;
|
|
StringRef AbbrevSection;
|
|
StringRef CurCUIndexSection;
|
|
StringRef CurTUIndexSection;
|
|
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// This maps each section contained in this file to its length.
|
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// This information is later on used to calculate the contributions,
|
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// i.e. offset and length, of each compile/type unit to a section.
|
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std::vector<std::pair<DWARFSectionKind, uint32_t>> SectionLength;
|
|
|
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for (const auto &Section : Obj.sections())
|
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if (auto Err = handleSection(
|
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KnownSections, StrSection, StrOffsetSection, TypesSection,
|
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CUIndexSection, TUIndexSection, InfoSection, Section, Out,
|
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UncompressedSections, ContributionOffsets, CurEntry,
|
|
CurStrSection, CurStrOffsetSection, CurTypesSection,
|
|
CurInfoSection, AbbrevSection, CurCUIndexSection,
|
|
CurTUIndexSection, SectionLength))
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return Err;
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|
|
|
if (CurInfoSection.empty())
|
|
continue;
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|
|
|
Expected<InfoSectionUnitHeader> HeaderOrErr =
|
|
parseInfoSectionUnitHeader(CurInfoSection.front());
|
|
if (!HeaderOrErr)
|
|
return HeaderOrErr.takeError();
|
|
InfoSectionUnitHeader &Header = *HeaderOrErr;
|
|
|
|
if (Version == 0) {
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Version = Header.Version;
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IndexVersion = Version < 5 ? 2 : 5;
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|
} else if (Version != Header.Version) {
|
|
return make_error<DWPError>("incompatible DWARF compile unit versions.");
|
|
}
|
|
|
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writeStringsAndOffsets(Out, Strings, StrOffsetSection, CurStrSection,
|
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CurStrOffsetSection, Header.Version);
|
|
|
|
for (auto Pair : SectionLength) {
|
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auto Index = getContributionIndex(Pair.first, IndexVersion);
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|
CurEntry.Contributions[Index].Offset = ContributionOffsets[Index];
|
|
ContributionOffsets[Index] +=
|
|
(CurEntry.Contributions[Index].Length = Pair.second);
|
|
}
|
|
|
|
uint32_t &InfoSectionOffset =
|
|
ContributionOffsets[getContributionIndex(DW_SECT_INFO, IndexVersion)];
|
|
if (CurCUIndexSection.empty()) {
|
|
bool FoundCUUnit = false;
|
|
Out.SwitchSection(InfoSection);
|
|
for (StringRef Info : CurInfoSection) {
|
|
uint64_t UnitOffset = 0;
|
|
while (Info.size() > UnitOffset) {
|
|
Expected<InfoSectionUnitHeader> HeaderOrError =
|
|
parseInfoSectionUnitHeader(Info.substr(UnitOffset, Info.size()));
|
|
if (!HeaderOrError)
|
|
return HeaderOrError.takeError();
|
|
InfoSectionUnitHeader &Header = *HeaderOrError;
|
|
|
|
UnitIndexEntry Entry = CurEntry;
|
|
auto &C = Entry.Contributions[getContributionIndex(DW_SECT_INFO,
|
|
IndexVersion)];
|
|
C.Offset = InfoSectionOffset;
|
|
C.Length = Header.Length + 4;
|
|
UnitOffset += C.Length;
|
|
if (Header.Version < 5 ||
|
|
Header.UnitType == dwarf::DW_UT_split_compile) {
|
|
Expected<CompileUnitIdentifiers> EID =
|
|
getCUIdentifiers(Header, AbbrevSection,
|
|
Info.substr(UnitOffset - C.Length, C.Length),
|
|
CurStrOffsetSection, CurStrSection);
|
|
|
|
if (!EID)
|
|
return createFileError(Input, EID.takeError());
|
|
const auto &ID = *EID;
|
|
auto P = IndexEntries.insert(std::make_pair(ID.Signature, Entry));
|
|
if (!P.second)
|
|
return buildDuplicateError(*P.first, ID, "");
|
|
P.first->second.Name = ID.Name;
|
|
P.first->second.DWOName = ID.DWOName;
|
|
|
|
FoundCUUnit = true;
|
|
} else if (Header.UnitType == dwarf::DW_UT_split_type) {
|
|
auto P = TypeIndexEntries.insert(
|
|
std::make_pair(Header.Signature.getValue(), Entry));
|
|
if (!P.second)
|
|
continue;
|
|
}
|
|
Out.emitBytes(Info.substr(UnitOffset - C.Length, C.Length));
|
|
InfoSectionOffset += C.Length;
|
|
}
|
|
}
|
|
|
|
if (!FoundCUUnit)
|
|
return make_error<DWPError>("no compile unit found in file: " + Input);
|
|
|
|
if (IndexVersion == 2) {
|
|
// Add types from the .debug_types section from DWARF < 5.
|
|
addAllTypesFromTypesSection(
|
|
Out, TypeIndexEntries, TypesSection, CurTypesSection, CurEntry,
|
|
ContributionOffsets[getContributionIndex(DW_SECT_EXT_TYPES, 2)]);
|
|
}
|
|
continue;
|
|
}
|
|
|
|
if (CurInfoSection.size() != 1)
|
|
return make_error<DWPError>("expected exactly one occurrence of a debug "
|
|
"info section in a .dwp file");
|
|
StringRef DwpSingleInfoSection = CurInfoSection.front();
|
|
|
|
DWARFUnitIndex CUIndex(DW_SECT_INFO);
|
|
DataExtractor CUIndexData(CurCUIndexSection, Obj.isLittleEndian(), 0);
|
|
if (!CUIndex.parse(CUIndexData))
|
|
return make_error<DWPError>("failed to parse cu_index");
|
|
if (CUIndex.getVersion() != IndexVersion)
|
|
return make_error<DWPError>("incompatible cu_index versions, found " +
|
|
utostr(CUIndex.getVersion()) +
|
|
" and expecting " + utostr(IndexVersion));
|
|
|
|
Out.SwitchSection(InfoSection);
|
|
for (const DWARFUnitIndex::Entry &E : CUIndex.getRows()) {
|
|
auto *I = E.getContributions();
|
|
if (!I)
|
|
continue;
|
|
auto P = IndexEntries.insert(std::make_pair(E.getSignature(), CurEntry));
|
|
StringRef CUInfoSection =
|
|
getSubsection(DwpSingleInfoSection, E, DW_SECT_INFO);
|
|
Expected<InfoSectionUnitHeader> HeaderOrError =
|
|
parseInfoSectionUnitHeader(CUInfoSection);
|
|
if (!HeaderOrError)
|
|
return HeaderOrError.takeError();
|
|
InfoSectionUnitHeader &Header = *HeaderOrError;
|
|
|
|
Expected<CompileUnitIdentifiers> EID = getCUIdentifiers(
|
|
Header, getSubsection(AbbrevSection, E, DW_SECT_ABBREV),
|
|
CUInfoSection,
|
|
getSubsection(CurStrOffsetSection, E, DW_SECT_STR_OFFSETS),
|
|
CurStrSection);
|
|
if (!EID)
|
|
return createFileError(Input, EID.takeError());
|
|
const auto &ID = *EID;
|
|
if (!P.second)
|
|
return buildDuplicateError(*P.first, ID, Input);
|
|
auto &NewEntry = P.first->second;
|
|
NewEntry.Name = ID.Name;
|
|
NewEntry.DWOName = ID.DWOName;
|
|
NewEntry.DWPName = Input;
|
|
for (auto Kind : CUIndex.getColumnKinds()) {
|
|
if (!isSupportedSectionKind(Kind))
|
|
continue;
|
|
auto &C =
|
|
NewEntry.Contributions[getContributionIndex(Kind, IndexVersion)];
|
|
C.Offset += I->Offset;
|
|
C.Length = I->Length;
|
|
++I;
|
|
}
|
|
unsigned Index = getContributionIndex(DW_SECT_INFO, IndexVersion);
|
|
auto &C = NewEntry.Contributions[Index];
|
|
Out.emitBytes(CUInfoSection);
|
|
C.Offset = InfoSectionOffset;
|
|
InfoSectionOffset += C.Length;
|
|
}
|
|
|
|
if (!CurTUIndexSection.empty()) {
|
|
llvm::DWARFSectionKind TUSectionKind;
|
|
MCSection *OutSection;
|
|
StringRef TypeInputSection;
|
|
// Write type units into debug info section for DWARFv5.
|
|
if (Version >= 5) {
|
|
TUSectionKind = DW_SECT_INFO;
|
|
OutSection = InfoSection;
|
|
TypeInputSection = DwpSingleInfoSection;
|
|
} else {
|
|
// Write type units into debug types section for DWARF < 5.
|
|
if (CurTypesSection.size() != 1)
|
|
return make_error<DWPError>(
|
|
"multiple type unit sections in .dwp file");
|
|
|
|
TUSectionKind = DW_SECT_EXT_TYPES;
|
|
OutSection = TypesSection;
|
|
TypeInputSection = CurTypesSection.front();
|
|
}
|
|
|
|
DWARFUnitIndex TUIndex(TUSectionKind);
|
|
DataExtractor TUIndexData(CurTUIndexSection, Obj.isLittleEndian(), 0);
|
|
if (!TUIndex.parse(TUIndexData))
|
|
return make_error<DWPError>("failed to parse tu_index");
|
|
if (TUIndex.getVersion() != IndexVersion)
|
|
return make_error<DWPError>("incompatible tu_index versions, found " +
|
|
utostr(TUIndex.getVersion()) +
|
|
" and expecting " + utostr(IndexVersion));
|
|
|
|
unsigned TypesContributionIndex =
|
|
getContributionIndex(TUSectionKind, IndexVersion);
|
|
addAllTypesFromDWP(Out, TypeIndexEntries, TUIndex, OutSection,
|
|
TypeInputSection, CurEntry,
|
|
ContributionOffsets[TypesContributionIndex],
|
|
TypesContributionIndex);
|
|
}
|
|
}
|
|
|
|
if (Version < 5) {
|
|
// Lie about there being no info contributions so the TU index only includes
|
|
// the type unit contribution for DWARF < 5. In DWARFv5 the TU index has a
|
|
// contribution to the info section, so we do not want to lie about it.
|
|
ContributionOffsets[0] = 0;
|
|
}
|
|
writeIndex(Out, MCOFI.getDwarfTUIndexSection(), ContributionOffsets,
|
|
TypeIndexEntries, IndexVersion);
|
|
|
|
if (Version < 5) {
|
|
// Lie about the type contribution for DWARF < 5. In DWARFv5 the type
|
|
// section does not exist, so no need to do anything about this.
|
|
ContributionOffsets[getContributionIndex(DW_SECT_EXT_TYPES, 2)] = 0;
|
|
// Unlie about the info contribution
|
|
ContributionOffsets[0] = 1;
|
|
}
|
|
|
|
writeIndex(Out, MCOFI.getDwarfCUIndexSection(), ContributionOffsets,
|
|
IndexEntries, IndexVersion);
|
|
|
|
return Error::success();
|
|
}
|
|
} // namespace llvm
|