119 lines · cpp
1//===- DWARFDebugPubTable.cpp ---------------------------------------------===//2//3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.4// See https://llvm.org/LICENSE.txt for license information.5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception6//7//===----------------------------------------------------------------------===//8 9#include "llvm/DebugInfo/DWARF/DWARFDebugPubTable.h"10#include "llvm/DebugInfo/DWARF/DWARFDataExtractor.h"11#include "llvm/ADT/StringRef.h"12#include "llvm/BinaryFormat/Dwarf.h"13#include "llvm/Support/DataExtractor.h"14#include "llvm/Support/Errc.h"15#include "llvm/Support/Format.h"16#include "llvm/Support/raw_ostream.h"17#include <cstdint>18 19using namespace llvm;20using namespace dwarf;21 22void DWARFDebugPubTable::extract(23 DWARFDataExtractor Data, bool GnuStyle,24 function_ref<void(Error)> RecoverableErrorHandler) {25 this->GnuStyle = GnuStyle;26 Sets.clear();27 uint64_t Offset = 0;28 while (Data.isValidOffset(Offset)) {29 uint64_t SetOffset = Offset;30 Sets.push_back({});31 Set &NewSet = Sets.back();32 33 DataExtractor::Cursor C(Offset);34 std::tie(NewSet.Length, NewSet.Format) = Data.getInitialLength(C);35 if (!C) {36 // Drop the newly added set because it does not contain anything useful37 // to dump.38 Sets.pop_back();39 RecoverableErrorHandler(createStringError(40 errc::invalid_argument,41 "name lookup table at offset 0x%" PRIx64 " parsing failed: %s",42 SetOffset, toString(C.takeError()).c_str()));43 return;44 }45 46 Offset = C.tell() + NewSet.Length;47 DWARFDataExtractor SetData(Data, Offset);48 const unsigned OffsetSize = dwarf::getDwarfOffsetByteSize(NewSet.Format);49 50 NewSet.Version = SetData.getU16(C);51 NewSet.Offset = SetData.getRelocatedValue(C, OffsetSize);52 NewSet.Size = SetData.getUnsigned(C, OffsetSize);53 54 if (!C) {55 // Preserve the newly added set because at least some fields of the header56 // are read and can be dumped.57 RecoverableErrorHandler(58 createStringError(errc::invalid_argument,59 "name lookup table at offset 0x%" PRIx6460 " does not have a complete header: %s",61 SetOffset, toString(C.takeError()).c_str()));62 continue;63 }64 65 while (C) {66 uint64_t DieRef = SetData.getUnsigned(C, OffsetSize);67 if (DieRef == 0)68 break;69 uint8_t IndexEntryValue = GnuStyle ? SetData.getU8(C) : 0;70 StringRef Name = SetData.getCStrRef(C);71 if (C)72 NewSet.Entries.push_back(73 {DieRef, PubIndexEntryDescriptor(IndexEntryValue), Name});74 }75 76 if (!C) {77 RecoverableErrorHandler(createStringError(78 errc::invalid_argument,79 "name lookup table at offset 0x%" PRIx64 " parsing failed: %s",80 SetOffset, toString(C.takeError()).c_str()));81 continue;82 }83 if (C.tell() != Offset)84 RecoverableErrorHandler(createStringError(85 errc::invalid_argument,86 "name lookup table at offset 0x%" PRIx6487 " has a terminator at offset 0x%" PRIx6488 " before the expected end at 0x%" PRIx64,89 SetOffset, C.tell() - OffsetSize, Offset - OffsetSize));90 }91}92 93void DWARFDebugPubTable::dump(raw_ostream &OS) const {94 for (const Set &S : Sets) {95 int OffsetDumpWidth = 2 * dwarf::getDwarfOffsetByteSize(S.Format);96 OS << "length = " << format("0x%0*" PRIx64, OffsetDumpWidth, S.Length);97 OS << ", format = " << dwarf::FormatString(S.Format);98 OS << ", version = " << format("0x%04x", S.Version);99 OS << ", unit_offset = "100 << format("0x%0*" PRIx64, OffsetDumpWidth, S.Offset);101 OS << ", unit_size = " << format("0x%0*" PRIx64, OffsetDumpWidth, S.Size)102 << '\n';103 OS << (GnuStyle ? "Offset Linkage Kind Name\n"104 : "Offset Name\n");105 106 for (const Entry &E : S.Entries) {107 OS << format("0x%0*" PRIx64 " ", OffsetDumpWidth, E.SecOffset);108 if (GnuStyle) {109 StringRef EntryLinkage =110 GDBIndexEntryLinkageString(E.Descriptor.Linkage);111 StringRef EntryKind = dwarf::GDBIndexEntryKindString(E.Descriptor.Kind);112 OS << format("%-8s", EntryLinkage.data()) << ' '113 << format("%-8s", EntryKind.data()) << ' ';114 }115 OS << '\"' << E.Name << "\"\n";116 }117 }118}119