lib/ObjectYAML/MinidumpYAML.cpp

   1 //===- MinidumpYAML.cpp - Minidump YAMLIO 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-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 #include "llvm/ObjectYAML/MinidumpYAML.h"
  10 #include "llvm/Support/Allocator.h"
  11 #include "llvm/Support/ConvertUTF.h"
  12
  13 using namespace llvm;
  14 using namespace llvm::MinidumpYAML;
  15 using namespace llvm::minidump;
  16
  17 namespace {
  18 /// A helper class to manage the placement of various structures into the final
  19 /// minidump binary. Space for objects can be allocated via various allocate***
  20 /// methods, while the final minidump file is written by calling the writeTo
  21 /// method. The plain versions of allocation functions take a reference to the
  22 /// data which is to be written (and hence the data must be available until
  23 /// writeTo is called), while the "New" versions allocate the data in an
  24 /// allocator-managed buffer, which is available until the allocator object is
  25 /// destroyed. For both kinds of functions, it is possible to modify the
  26 /// data for which the space has been "allocated" until the final writeTo call.
  27 /// This is useful for "linking" the allocated structures via their offsets.
  28 class BlobAllocator {
  29 public:
  30   size_t tell() const { return NextOffset; }
  31
  32   size_t allocateCallback(size_t Size,
  33                           std::function<void(raw_ostream &)> Callback) {
  34     size_t Offset = NextOffset;
  35     NextOffset += Size;
  36     Callbacks.push_back(std::move(Callback));
  37     return Offset;
  38   }
  39
  40   size_t allocateBytes(ArrayRef<uint8_t> Data) {
  41     return allocateCallback(
  42         Data.size(), [Data](raw_ostream &OS) { OS << toStringRef(Data); });
  43   }
  44
  45   size_t allocateBytes(yaml::BinaryRef Data) {
  46     return allocateCallback(Data.binary_size(), [Data](raw_ostream &OS) {
  47       Data.writeAsBinary(OS);
  48     });
  49   }
  50
  51   template <typename T> size_t allocateArray(ArrayRef<T> Data) {
  52     return allocateBytes({reinterpret_cast<const uint8_t *>(Data.data()),
  53                           sizeof(T) * Data.size()});
  54   }
  55
  56   template <typename T, typename RangeType>
  57   std::pair<size_t, MutableArrayRef<T>>
  58   allocateNewArray(const iterator_range<RangeType> &Range);
  59
  60   template <typename T> size_t allocateObject(const T &Data) {
  61     return allocateArray(makeArrayRef(Data));
  62   }
  63
  64   template <typename T, typename... Types>
  65   std::pair<size_t, T *> allocateNewObject(Types &&... Args) {
  66     T *Object = new (Temporaries.Allocate<T>()) T(std::forward<Types>(Args)...);
  67     return {allocateObject(*Object), Object};
  68   }
  69
  70   size_t allocateString(StringRef Str);
  71
  72   void writeTo(raw_ostream &OS) const;
  73
  74 private:
  75   size_t NextOffset = 0;
  76
  77   BumpPtrAllocator Temporaries;
  78   std::vector<std::function<void(raw_ostream &)>> Callbacks;
  79 };
  80 } // namespace
  81
  82 template <typename T, typename RangeType>
  83 std::pair<size_t, MutableArrayRef<T>>
  84 BlobAllocator::allocateNewArray(const iterator_range<RangeType> &Range) {
  85   size_t Num = std::distance(Range.begin(), Range.end());
  86   MutableArrayRef<T> Array(Temporaries.Allocate<T>(Num), Num);
  87   std::uninitialized_copy(Range.begin(), Range.end(), Array.begin());
  88   return {allocateArray(Array), Array};
  89 }
  90
  91 size_t BlobAllocator::allocateString(StringRef Str) {
  92   SmallVector<UTF16, 32> WStr;
  93   bool OK = convertUTF8ToUTF16String(Str, WStr);
  94   assert(OK && "Invalid UTF8 in Str?");
  95   (void)OK;
  96
  97   // The utf16 string is null-terminated, but the terminator is not counted in
  98   // the string size.
  99   WStr.push_back(0);
 100   size_t Result =
 101       allocateNewObject<support::ulittle32_t>(2 * (WStr.size() - 1)).first;
 102   allocateNewArray<support::ulittle16_t>(make_range(WStr.begin(), WStr.end()));
 103   return Result;
 104 }
 105
 106 void BlobAllocator::writeTo(raw_ostream &OS) const {
 107   size_t BeginOffset = OS.tell();
 108   for (const auto &Callback : Callbacks)
 109     Callback(OS);
 110   assert(OS.tell() == BeginOffset + NextOffset &&
 111          "Callbacks wrote an unexpected number of bytes.");
 112   (void)BeginOffset;
 113 }
 114
 115 /// Perform an optional yaml-mapping of an endian-aware type EndianType. The
 116 /// only purpose of this function is to avoid casting the Default value to the
 117 /// endian type;
 118 template <typename EndianType>
 119 static inline void mapOptional(yaml::IO &IO, const char *Key, EndianType &Val,
 120                                typename EndianType::value_type Default) {
 121   IO.mapOptional(Key, Val, EndianType(Default));
 122 }
 123
 124 /// Yaml-map an endian-aware type EndianType as some other type MapType.
 125 template <typename MapType, typename EndianType>
 126 static inline void mapRequiredAs(yaml::IO &IO, const char *Key,
 127                                  EndianType &Val) {
 128   MapType Mapped = static_cast<typename EndianType::value_type>(Val);
 129   IO.mapRequired(Key, Mapped);
 130   Val = static_cast<typename EndianType::value_type>(Mapped);
 131 }
 132
 133 /// Perform an optional yaml-mapping of an endian-aware type EndianType as some
 134 /// other type MapType.
 135 template <typename MapType, typename EndianType>
 136 static inline void mapOptionalAs(yaml::IO &IO, const char *Key, EndianType &Val,
 137                                  MapType Default) {
 138   MapType Mapped = static_cast<typename EndianType::value_type>(Val);
 139   IO.mapOptional(Key, Mapped, Default);
 140   Val = static_cast<typename EndianType::value_type>(Mapped);
 141 }
 142
 143 namespace {
 144 /// Return the appropriate yaml Hex type for a given endian-aware type.
 145 template <typename EndianType> struct HexType;
 146 template <> struct HexType<support::ulittle16_t> { using type = yaml::Hex16; };
 147 template <> struct HexType<support::ulittle32_t> { using type = yaml::Hex32; };
 148 template <> struct HexType<support::ulittle64_t> { using type = yaml::Hex64; };
 149 } // namespace
 150
 151 /// Yaml-map an endian-aware type as an appropriately-sized hex value.
 152 template <typename EndianType>
 153 static inline void mapRequiredHex(yaml::IO &IO, const char *Key,
 154                                   EndianType &Val) {
 155   mapRequiredAs<typename HexType<EndianType>::type>(IO, Key, Val);
 156 }
 157
 158 /// Perform an optional yaml-mapping of an endian-aware type as an
 159 /// appropriately-sized hex value.
 160 template <typename EndianType>
 161 static inline void mapOptionalHex(yaml::IO &IO, const char *Key,
 162                                   EndianType &Val,
 163                                   typename EndianType::value_type Default) {
 164   mapOptionalAs<typename HexType<EndianType>::type>(IO, Key, Val, Default);
 165 }
 166
 167 Stream::~Stream() = default;
 168
 169 Stream::StreamKind Stream::getKind(StreamType Type) {
 170   switch (Type) {
 171   case StreamType::ModuleList:
 172     return StreamKind::ModuleList;
 173   case StreamType::SystemInfo:
 174     return StreamKind::SystemInfo;
 175   case StreamType::LinuxCPUInfo:
 176   case StreamType::LinuxProcStatus:
 177   case StreamType::LinuxLSBRelease:
 178   case StreamType::LinuxCMDLine:
 179   case StreamType::LinuxMaps:
 180   case StreamType::LinuxProcStat:
 181   case StreamType::LinuxProcUptime:
 182     return StreamKind::TextContent;
 183   default:
 184     return StreamKind::RawContent;
 185   }
 186 }
 187
 188 std::unique_ptr<Stream> Stream::create(StreamType Type) {
 189   StreamKind Kind = getKind(Type);
 190   switch (Kind) {
 191   case StreamKind::ModuleList:
 192     return llvm::make_unique<ModuleListStream>();
 193   case StreamKind::RawContent:
 194     return llvm::make_unique<RawContentStream>(Type);
 195   case StreamKind::SystemInfo:
 196     return llvm::make_unique<SystemInfoStream>();
 197   case StreamKind::TextContent:
 198     return llvm::make_unique<TextContentStream>(Type);
 199   }
 200   llvm_unreachable("Unhandled stream kind!");
 201 }
 202
 203 void yaml::ScalarEnumerationTraits<ProcessorArchitecture>::enumeration(
 204     IO &IO, ProcessorArchitecture &Arch) {
 205 #define HANDLE_MDMP_ARCH(CODE, NAME)                                           \
 206   IO.enumCase(Arch, #NAME, ProcessorArchitecture::NAME);
 207 #include "llvm/BinaryFormat/MinidumpConstants.def"
 208   IO.enumFallback<Hex16>(Arch);
 209 }
 210
 211 void yaml::ScalarEnumerationTraits<OSPlatform>::enumeration(IO &IO,
 212                                                             OSPlatform &Plat) {
 213 #define HANDLE_MDMP_PLATFORM(CODE, NAME)                                       \
 214   IO.enumCase(Plat, #NAME, OSPlatform::NAME);
 215 #include "llvm/BinaryFormat/MinidumpConstants.def"
 216   IO.enumFallback<Hex32>(Plat);
 217 }
 218
 219 void yaml::ScalarEnumerationTraits<StreamType>::enumeration(IO &IO,
 220                                                             StreamType &Type) {
 221 #define HANDLE_MDMP_STREAM_TYPE(CODE, NAME)                                    \
 222   IO.enumCase(Type, #NAME, StreamType::NAME);
 223 #include "llvm/BinaryFormat/MinidumpConstants.def"
 224   IO.enumFallback<Hex32>(Type);
 225 }
 226
 227 void yaml::MappingTraits<CPUInfo::ArmInfo>::mapping(IO &IO,
 228                                                     CPUInfo::ArmInfo &Info) {
 229   mapRequiredHex(IO, "CPUID", Info.CPUID);
 230   mapOptionalHex(IO, "ELF hwcaps", Info.ElfHWCaps, 0);
 231 }
 232
 233 namespace {
 234 template <std::size_t N> struct FixedSizeHex {
 235   FixedSizeHex(uint8_t (&Storage)[N]) : Storage(Storage) {}
 236
 237   uint8_t (&Storage)[N];
 238 };
 239 } // namespace
 240
 241 namespace llvm {
 242 namespace yaml {
 243 template <std::size_t N> struct ScalarTraits<FixedSizeHex<N>> {
 244   static void output(const FixedSizeHex<N> &Fixed, void *, raw_ostream &OS) {
 245     OS << toHex(makeArrayRef(Fixed.Storage));
 246   }
 247
 248   static StringRef input(StringRef Scalar, void *, FixedSizeHex<N> &Fixed) {
 249     if (!all_of(Scalar, isHexDigit))
 250       return "Invalid hex digit in input";
 251     if (Scalar.size() < 2 * N)
 252       return "String too short";
 253     if (Scalar.size() > 2 * N)
 254       return "String too long";
 255     copy(fromHex(Scalar), Fixed.Storage);
 256     return "";
 257   }
 258
 259   static QuotingType mustQuote(StringRef S) { return QuotingType::None; }
 260 };
 261 } // namespace yaml
 262 } // namespace llvm
 263 void yaml::MappingTraits<CPUInfo::OtherInfo>::mapping(
 264     IO &IO, CPUInfo::OtherInfo &Info) {
 265   FixedSizeHex<sizeof(Info.ProcessorFeatures)> Features(Info.ProcessorFeatures);
 266   IO.mapRequired("Features", Features);
 267 }
 268
 269 namespace {
 270 /// A type which only accepts strings of a fixed size for yaml conversion.
 271 template <std::size_t N> struct FixedSizeString {
 272   FixedSizeString(char (&Storage)[N]) : Storage(Storage) {}
 273
 274   char (&Storage)[N];
 275 };
 276 } // namespace
 277
 278 namespace llvm {
 279 namespace yaml {
 280 template <std::size_t N> struct ScalarTraits<FixedSizeString<N>> {
 281   static void output(const FixedSizeString<N> &Fixed, void *, raw_ostream &OS) {
 282     OS << StringRef(Fixed.Storage, N);
 283   }
 284
 285   static StringRef input(StringRef Scalar, void *, FixedSizeString<N> &Fixed) {
 286     if (Scalar.size() < N)
 287       return "String too short";
 288     if (Scalar.size() > N)
 289       return "String too long";
 290     copy(Scalar, Fixed.Storage);
 291     return "";
 292   }
 293
 294   static QuotingType mustQuote(StringRef S) { return needsQuotes(S); }
 295 };
 296 } // namespace yaml
 297 } // namespace llvm
 298
 299 void yaml::MappingTraits<CPUInfo::X86Info>::mapping(IO &IO,
 300                                                     CPUInfo::X86Info &Info) {
 301   FixedSizeString<sizeof(Info.VendorID)> VendorID(Info.VendorID);
 302   IO.mapRequired("Vendor ID", VendorID);
 303
 304   mapRequiredHex(IO, "Version Info", Info.VersionInfo);
 305   mapRequiredHex(IO, "Feature Info", Info.FeatureInfo);
 306   mapOptionalHex(IO, "AMD Extended Features", Info.AMDExtendedFeatures, 0);
 307 }
 308
 309 void yaml::MappingTraits<VSFixedFileInfo>::mapping(IO &IO,
 310                                                    VSFixedFileInfo &Info) {
 311   mapOptionalHex(IO, "Signature", Info.Signature, 0);
 312   mapOptionalHex(IO, "Struct Version", Info.StructVersion, 0);
 313   mapOptionalHex(IO, "File Version High", Info.FileVersionHigh, 0);
 314   mapOptionalHex(IO, "File Version Low", Info.FileVersionLow, 0);
 315   mapOptionalHex(IO, "Product Version High", Info.ProductVersionHigh, 0);
 316   mapOptionalHex(IO, "Product Version Low", Info.ProductVersionLow, 0);
 317   mapOptionalHex(IO, "File Flags Mask", Info.FileFlagsMask, 0);
 318   mapOptionalHex(IO, "File Flags", Info.FileFlags, 0);
 319   mapOptionalHex(IO, "File OS", Info.FileOS, 0);
 320   mapOptionalHex(IO, "File Type", Info.FileType, 0);
 321   mapOptionalHex(IO, "File Subtype", Info.FileSubtype, 0);
 322   mapOptionalHex(IO, "File Date High", Info.FileDateHigh, 0);
 323   mapOptionalHex(IO, "File Date Low", Info.FileDateLow, 0);
 324 }
 325
 326 void yaml::MappingTraits<ModuleListStream::ParsedModule>::mapping(
 327     IO &IO, ModuleListStream::ParsedModule &M) {
 328   mapRequiredHex(IO, "Base of Image", M.Module.BaseOfImage);
 329   mapRequiredHex(IO, "Size of Image", M.Module.SizeOfImage);
 330   mapOptionalHex(IO, "Checksum", M.Module.Checksum, 0);
 331   IO.mapOptional("Time Date Stamp", M.Module.TimeDateStamp,
 332                  support::ulittle32_t(0));
 333   IO.mapRequired("Module Name", M.Name);
 334   IO.mapOptional("Version Info", M.Module.VersionInfo, VSFixedFileInfo());
 335   IO.mapRequired("CodeView Record", M.CvRecord);
 336   IO.mapOptional("Misc Record", M.MiscRecord, yaml::BinaryRef());
 337   mapOptionalHex(IO, "Reserved0", M.Module.Reserved0, 0);
 338   mapOptionalHex(IO, "Reserved1", M.Module.Reserved1, 0);
 339 }
 340
 341 static void streamMapping(yaml::IO &IO, RawContentStream &Stream) {
 342   IO.mapOptional("Content", Stream.Content);
 343   IO.mapOptional("Size", Stream.Size, Stream.Content.binary_size());
 344 }
 345
 346 static StringRef streamValidate(RawContentStream &Stream) {
 347   if (Stream.Size.value < Stream.Content.binary_size())
 348     return "Stream size must be greater or equal to the content size";
 349   return "";
 350 }
 351
 352 static void streamMapping(yaml::IO &IO, ModuleListStream &Stream) {
 353   IO.mapRequired("Modules", Stream.Modules);
 354 }
 355
 356 static void streamMapping(yaml::IO &IO, SystemInfoStream &Stream) {
 357   SystemInfo &Info = Stream.Info;
 358   IO.mapRequired("Processor Arch", Info.ProcessorArch);
 359   mapOptional(IO, "Processor Level", Info.ProcessorLevel, 0);
 360   mapOptional(IO, "Processor Revision", Info.ProcessorRevision, 0);
 361   IO.mapOptional("Number of Processors", Info.NumberOfProcessors, 0);
 362   IO.mapOptional("Product type", Info.ProductType, 0);
 363   mapOptional(IO, "Major Version", Info.MajorVersion, 0);
 364   mapOptional(IO, "Minor Version", Info.MinorVersion, 0);
 365   mapOptional(IO, "Build Number", Info.BuildNumber, 0);
 366   IO.mapRequired("Platform ID", Info.PlatformId);
 367   IO.mapOptional("CSD Version", Stream.CSDVersion, "");
 368   mapOptionalHex(IO, "Suite Mask", Info.SuiteMask, 0);
 369   mapOptionalHex(IO, "Reserved", Info.Reserved, 0);
 370   switch (static_cast<ProcessorArchitecture>(Info.ProcessorArch)) {
 371   case ProcessorArchitecture::X86:
 372   case ProcessorArchitecture::AMD64:
 373     IO.mapOptional("CPU", Info.CPU.X86);
 374     break;
 375   case ProcessorArchitecture::ARM:
 376   case ProcessorArchitecture::ARM64:
 377     IO.mapOptional("CPU", Info.CPU.Arm);
 378     break;
 379   default:
 380     IO.mapOptional("CPU", Info.CPU.Other);
 381     break;
 382   }
 383 }
 384
 385 static void streamMapping(yaml::IO &IO, TextContentStream &Stream) {
 386   IO.mapOptional("Text", Stream.Text);
 387 }
 388
 389 void yaml::MappingTraits<std::unique_ptr<Stream>>::mapping(
 390     yaml::IO &IO, std::unique_ptr<MinidumpYAML::Stream> &S) {
 391   StreamType Type;
 392   if (IO.outputting())
 393     Type = S->Type;
 394   IO.mapRequired("Type", Type);
 395
 396   if (!IO.outputting())
 397     S = MinidumpYAML::Stream::create(Type);
 398   switch (S->Kind) {
 399   case MinidumpYAML::Stream::StreamKind::ModuleList:
 400     streamMapping(IO, llvm::cast<ModuleListStream>(*S));
 401     break;
 402   case MinidumpYAML::Stream::StreamKind::RawContent:
 403     streamMapping(IO, llvm::cast<RawContentStream>(*S));
 404     break;
 405   case MinidumpYAML::Stream::StreamKind::SystemInfo:
 406     streamMapping(IO, llvm::cast<SystemInfoStream>(*S));
 407     break;
 408   case MinidumpYAML::Stream::StreamKind::TextContent:
 409     streamMapping(IO, llvm::cast<TextContentStream>(*S));
 410     break;
 411   }
 412 }
 413
 414 StringRef yaml::MappingTraits<std::unique_ptr<Stream>>::validate(
 415     yaml::IO &IO, std::unique_ptr<MinidumpYAML::Stream> &S) {
 416   switch (S->Kind) {
 417   case MinidumpYAML::Stream::StreamKind::RawContent:
 418     return streamValidate(cast<RawContentStream>(*S));
 419   case MinidumpYAML::Stream::StreamKind::ModuleList:
 420   case MinidumpYAML::Stream::StreamKind::SystemInfo:
 421   case MinidumpYAML::Stream::StreamKind::TextContent:
 422     return "";
 423   }
 424   llvm_unreachable("Fully covered switch above!");
 425 }
 426
 427 void yaml::MappingTraits<Object>::mapping(IO &IO, Object &O) {
 428   IO.mapTag("!minidump", true);
 429   mapOptionalHex(IO, "Signature", O.Header.Signature, Header::MagicSignature);
 430   mapOptionalHex(IO, "Version", O.Header.Version, Header::MagicVersion);
 431   mapOptionalHex(IO, "Flags", O.Header.Flags, 0);
 432   IO.mapRequired("Streams", O.Streams);
 433 }
 434
 435 static Directory layout(BlobAllocator &File, Stream &S) {
 436   Directory Result;
 437   Result.Type = S.Type;
 438   Result.Location.RVA = File.tell();
 439   Optional<size_t> DataEnd;
 440   switch (S.Kind) {
 441   case Stream::StreamKind::ModuleList: {
 442     ModuleListStream &List = cast<ModuleListStream>(S);
 443
 444     File.allocateNewObject<support::ulittle32_t>(List.Modules.size());
 445     for (ModuleListStream::ParsedModule &M : List.Modules)
 446       File.allocateObject(M.Module);
 447
 448     // Module names and CodeView/Misc records are not a part of the stream.
 449     DataEnd = File.tell();
 450     for (ModuleListStream::ParsedModule &M : List.Modules) {
 451       M.Module.ModuleNameRVA = File.allocateString(M.Name);
 452
 453       M.Module.CvRecord.RVA = File.allocateBytes(M.CvRecord);
 454       M.Module.CvRecord.DataSize = M.CvRecord.binary_size();
 455
 456       M.Module.MiscRecord.RVA = File.allocateBytes(M.MiscRecord);
 457       M.Module.MiscRecord.DataSize = M.MiscRecord.binary_size();
 458     }
 459     break;
 460   }
 461   case Stream::StreamKind::RawContent: {
 462     RawContentStream &Raw = cast<RawContentStream>(S);
 463     File.allocateCallback(Raw.Size, [&Raw](raw_ostream &OS) {
 464       Raw.Content.writeAsBinary(OS);
 465       assert(Raw.Content.binary_size() <= Raw.Size);
 466       OS << std::string(Raw.Size - Raw.Content.binary_size(), '\0');
 467     });
 468     break;
 469   }
 470   case Stream::StreamKind::SystemInfo: {
 471     SystemInfoStream &SystemInfo = cast<SystemInfoStream>(S);
 472     File.allocateObject(SystemInfo.Info);
 473     // The CSD string is not a part of the stream.
 474     DataEnd = File.tell();
 475     SystemInfo.Info.CSDVersionRVA = File.allocateString(SystemInfo.CSDVersion);
 476     break;
 477   }
 478   case Stream::StreamKind::TextContent:
 479     File.allocateArray(arrayRefFromStringRef(cast<TextContentStream>(S).Text));
 480     break;
 481   }
 482   // If DataEnd is not set, we assume everything we generated is a part of the
 483   // stream.
 484   Result.Location.DataSize =
 485       DataEnd.getValueOr(File.tell()) - Result.Location.RVA;
 486   return Result;
 487 }
 488
 489 void MinidumpYAML::writeAsBinary(Object &Obj, raw_ostream &OS) {
 490   BlobAllocator File;
 491   File.allocateObject(Obj.Header);
 492
 493   std::vector<Directory> StreamDirectory(Obj.Streams.size());
 494   Obj.Header.StreamDirectoryRVA =
 495       File.allocateArray(makeArrayRef(StreamDirectory));
 496   Obj.Header.NumberOfStreams = StreamDirectory.size();
 497
 498   for (auto &Stream : enumerate(Obj.Streams))
 499     StreamDirectory[Stream.index()] = layout(File, *Stream.value());
 500
 501   File.writeTo(OS);
 502 }
 503
 504 Error MinidumpYAML::writeAsBinary(StringRef Yaml, raw_ostream &OS) {
 505   yaml::Input Input(Yaml);
 506   Object Obj;
 507   Input >> Obj;
 508   if (std::error_code EC = Input.error())
 509     return errorCodeToError(EC);
 510
 511   writeAsBinary(Obj, OS);
 512   return Error::success();
 513 }
 514
 515 Expected<std::unique_ptr<Stream>>
 516 Stream::create(const Directory &StreamDesc, const object::MinidumpFile &File) {
 517   StreamKind Kind = getKind(StreamDesc.Type);
 518   switch (Kind) {
 519   case StreamKind::ModuleList: {
 520     auto ExpectedList = File.getModuleList();
 521     if (!ExpectedList)
 522       return ExpectedList.takeError();
 523     std::vector<ModuleListStream::ParsedModule> Modules;
 524     for (const Module &M : *ExpectedList) {
 525       auto ExpectedName = File.getString(M.ModuleNameRVA);
 526       if (!ExpectedName)
 527         return ExpectedName.takeError();
 528       auto ExpectedCv = File.getRawData(M.CvRecord);
 529       if (!ExpectedCv)
 530         return ExpectedCv.takeError();
 531       auto ExpectedMisc = File.getRawData(M.MiscRecord);
 532       if (!ExpectedMisc)
 533         return ExpectedMisc.takeError();
 534       Modules.push_back(
 535           {M, std::move(*ExpectedName), *ExpectedCv, *ExpectedMisc});
 536     }
 537     return llvm::make_unique<ModuleListStream>(std::move(Modules));
 538   }
 539   case StreamKind::RawContent:
 540     return llvm::make_unique<RawContentStream>(StreamDesc.Type,
 541                                                File.getRawStream(StreamDesc));
 542   case StreamKind::SystemInfo: {
 543     auto ExpectedInfo = File.getSystemInfo();
 544     if (!ExpectedInfo)
 545       return ExpectedInfo.takeError();
 546     auto ExpectedCSDVersion = File.getString(ExpectedInfo->CSDVersionRVA);
 547     if (!ExpectedCSDVersion)
 548       return ExpectedInfo.takeError();
 549     return llvm::make_unique<SystemInfoStream>(*ExpectedInfo,
 550                                                std::move(*ExpectedCSDVersion));
 551   }
 552   case StreamKind::TextContent:
 553     return llvm::make_unique<TextContentStream>(
 554         StreamDesc.Type, toStringRef(File.getRawStream(StreamDesc)));
 555   }
 556   llvm_unreachable("Unhandled stream kind!");
 557 }
 558
 559 Expected<Object> Object::create(const object::MinidumpFile &File) {
 560   std::vector<std::unique_ptr<Stream>> Streams;
 561   Streams.reserve(File.streams().size());
 562   for (const Directory &StreamDesc : File.streams()) {
 563     auto ExpectedStream = Stream::create(StreamDesc, File);
 564     if (!ExpectedStream)
 565       return ExpectedStream.takeError();
 566     Streams.push_back(std::move(*ExpectedStream));
 567   }
 568   return Object(File.header(), std::move(Streams));
 569 }