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1//===- Minidump.cpp - Minidump object file implementation -----------------===//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/Object/Minidump.h"10#include "llvm/Support/ConvertUTF.h"11 12using namespace llvm;13using namespace llvm::object;14using namespace llvm::minidump;15 16std::optional<ArrayRef<uint8_t>>17MinidumpFile::getRawStream(minidump::StreamType Type) const {18  auto It = StreamMap.find(Type);19  if (It != StreamMap.end())20    return getRawStream(Streams[It->second]);21  return std::nullopt;22}23 24Expected<std::string> MinidumpFile::getString(size_t Offset) const {25  // Minidump strings consist of a 32-bit length field, which gives the size of26  // the string in *bytes*. This is followed by the actual string encoded in27  // UTF16.28  auto ExpectedSize =29      getDataSliceAs<support::ulittle32_t>(getData(), Offset, 1);30  if (!ExpectedSize)31    return ExpectedSize.takeError();32  size_t Size = (*ExpectedSize)[0];33  if (Size % 2 != 0)34    return createError("String size not even");35  Size /= 2;36  if (Size == 0)37    return "";38 39  Offset += sizeof(support::ulittle32_t);40  auto ExpectedData =41      getDataSliceAs<support::ulittle16_t>(getData(), Offset, Size);42  if (!ExpectedData)43    return ExpectedData.takeError();44 45  SmallVector<UTF16, 32> WStr(Size);46  copy(*ExpectedData, WStr.begin());47 48  std::string Result;49  if (!convertUTF16ToUTF8String(WStr, Result))50    return createError("String decoding failed");51 52  return Result;53}54 55iterator_range<llvm::object::MinidumpFile::ExceptionStreamsIterator>56MinidumpFile::getExceptionStreams() const {57  return make_range(ExceptionStreamsIterator(ExceptionStreams, this),58                    ExceptionStreamsIterator({}, this));59}60 61Expected<iterator_range<MinidumpFile::MemoryInfoIterator>>62MinidumpFile::getMemoryInfoList() const {63  std::optional<ArrayRef<uint8_t>> Stream =64      getRawStream(StreamType::MemoryInfoList);65  if (!Stream)66    return createError("No such stream");67  auto ExpectedHeader =68      getDataSliceAs<minidump::MemoryInfoListHeader>(*Stream, 0, 1);69  if (!ExpectedHeader)70    return ExpectedHeader.takeError();71  const minidump::MemoryInfoListHeader &H = ExpectedHeader.get()[0];72  Expected<ArrayRef<uint8_t>> Data =73      getDataSlice(*Stream, H.SizeOfHeader, H.SizeOfEntry * H.NumberOfEntries);74  if (!Data)75    return Data.takeError();76  return make_range(MemoryInfoIterator(*Data, H.SizeOfEntry),77                    MemoryInfoIterator({}, H.SizeOfEntry));78}79 80Expected<ArrayRef<uint8_t>> MinidumpFile::getDataSlice(ArrayRef<uint8_t> Data,81                                                       uint64_t Offset,82                                                       uint64_t Size) {83  // Check for overflow.84  if (Offset + Size < Offset || Offset + Size < Size ||85      Offset + Size > Data.size())86    return createEOFError();87  return Data.slice(Offset, Size);88}89 90Expected<std::unique_ptr<MinidumpFile>>91MinidumpFile::create(MemoryBufferRef Source) {92  ArrayRef<uint8_t> Data = arrayRefFromStringRef(Source.getBuffer());93  auto ExpectedHeader = getDataSliceAs<minidump::Header>(Data, 0, 1);94  if (!ExpectedHeader)95    return ExpectedHeader.takeError();96 97  const minidump::Header &Hdr = (*ExpectedHeader)[0];98  if (Hdr.Signature != Header::MagicSignature)99    return createError("Invalid signature");100  if ((Hdr.Version & 0xffff) != Header::MagicVersion)101    return createError("Invalid version");102 103  auto ExpectedStreams = getDataSliceAs<Directory>(Data, Hdr.StreamDirectoryRVA,104                                                   Hdr.NumberOfStreams);105  if (!ExpectedStreams)106    return ExpectedStreams.takeError();107 108  DenseMap<StreamType, std::size_t> StreamMap;109  std::vector<Directory> ExceptionStreams;110  for (const auto &StreamDescriptor : llvm::enumerate(*ExpectedStreams)) {111    StreamType Type = StreamDescriptor.value().Type;112    const LocationDescriptor &Loc = StreamDescriptor.value().Location;113 114    Expected<ArrayRef<uint8_t>> Stream =115        getDataSlice(Data, Loc.RVA, Loc.DataSize);116    if (!Stream)117      return Stream.takeError();118 119    if (Type == StreamType::Unused && Loc.DataSize == 0) {120      // Ignore dummy streams. This is technically ill-formed, but a number of121      // existing minidumps seem to contain such streams.122      continue;123    }124 125    // Exceptions can be treated as a special case of streams. Other streams126    // represent a list of entities, but exceptions are unique per stream.127    if (Type == StreamType::Exception) {128      ExceptionStreams.push_back(StreamDescriptor.value());129      continue;130    }131 132    if (Type == DenseMapInfo<StreamType>::getEmptyKey() ||133        Type == DenseMapInfo<StreamType>::getTombstoneKey())134      return createError("Cannot handle one of the minidump streams");135 136    // Update the directory map, checking for duplicate stream types.137    if (!StreamMap.try_emplace(Type, StreamDescriptor.index()).second)138      return createError("Duplicate stream type");139  }140 141  return std::unique_ptr<MinidumpFile>(142      new MinidumpFile(Source, Hdr, *ExpectedStreams, std::move(StreamMap),143                       std::move(ExceptionStreams)));144}145 146iterator_range<MinidumpFile::FallibleMemory64Iterator>147MinidumpFile::getMemory64List(Error &Err) const {148  ErrorAsOutParameter ErrAsOutParam(Err);149  auto end = FallibleMemory64Iterator::end(Memory64Iterator::end());150  Expected<minidump::Memory64ListHeader> ListHeader = getMemoryList64Header();151  if (!ListHeader) {152    Err = ListHeader.takeError();153    return make_range(end, end);154  }155 156  std::optional<ArrayRef<uint8_t>> Stream =157      getRawStream(StreamType::Memory64List);158  if (!Stream) {159    Err = createError("No such stream");160    return make_range(end, end);161  }162 163  Expected<ArrayRef<minidump::MemoryDescriptor_64>> Descriptors =164      getDataSliceAs<minidump::MemoryDescriptor_64>(165          *Stream, sizeof(Memory64ListHeader),166          ListHeader->NumberOfMemoryRanges);167 168  if (!Descriptors) {169    Err = Descriptors.takeError();170    return make_range(end, end);171  }172 173  if (!Descriptors->empty() &&174      ListHeader->BaseRVA + Descriptors->front().DataSize > getData().size()) {175    Err = createError("Memory64List header RVA out of range");176    return make_range(end, end);177  }178 179  return make_range(FallibleMemory64Iterator::itr(180                        Memory64Iterator::begin(181                            getData().slice(ListHeader->BaseRVA), *Descriptors),182                        Err),183                    FallibleMemory64Iterator::end(Memory64Iterator::end()));184}185