lib/DebugInfo/Symbolize/Symbolize.cpp

   1 //===-- LLVMSymbolize.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-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8 //
   9 // Implementation for LLVM symbolization library.
  10 //
  11 //===----------------------------------------------------------------------===//
  12
  13 #include "llvm/DebugInfo/Symbolize/Symbolize.h"
  14
  15 #include "SymbolizableObjectFile.h"
  16
  17 #include "llvm/ADT/STLExtras.h"
  18 #include "llvm/BinaryFormat/COFF.h"
  19 #include "llvm/DebugInfo/DWARF/DWARFContext.h"
  20 #include "llvm/DebugInfo/PDB/PDB.h"
  21 #include "llvm/DebugInfo/PDB/PDBContext.h"
  22 #include "llvm/Demangle/Demangle.h"
  23 #include "llvm/Object/COFF.h"
  24 #include "llvm/Object/MachO.h"
  25 #include "llvm/Object/MachOUniversal.h"
  26 #include "llvm/Support/CRC.h"
  27 #include "llvm/Support/Casting.h"
  28 #include "llvm/Support/Compression.h"
  29 #include "llvm/Support/DataExtractor.h"
  30 #include "llvm/Support/Errc.h"
  31 #include "llvm/Support/FileSystem.h"
  32 #include "llvm/Support/MemoryBuffer.h"
  33 #include "llvm/Support/Path.h"
  34 #include <algorithm>
  35 #include <cassert>
  36 #include <cstring>
  37
  38 #if defined(_MSC_VER)
  39 #include <Windows.h>
  40
  41 // This must be included after windows.h.
  42 #include <DbgHelp.h>
  43 #pragma comment(lib, "dbghelp.lib")
  44
  45 // Windows.h conflicts with our COFF header definitions.
  46 #ifdef IMAGE_FILE_MACHINE_I386
  47 #undef IMAGE_FILE_MACHINE_I386
  48 #endif
  49 #endif
  50
  51 namespace llvm {
  52 namespace symbolize {
  53
  54 Expected<DILineInfo>
  55 LLVMSymbolizer::symbolizeCodeCommon(SymbolizableModule *Info,
  56                                     object::SectionedAddress ModuleOffset) {
  57   // A null module means an error has already been reported. Return an empty
  58   // result.
  59   if (!Info)
  60     return DILineInfo();
  61
  62   // If the user is giving us relative addresses, add the preferred base of the
  63   // object to the offset before we do the query. It's what DIContext expects.
  64   if (Opts.RelativeAddresses)
  65     ModuleOffset.Address += Info->getModulePreferredBase();
  66
  67   DILineInfo LineInfo = Info->symbolizeCode(ModuleOffset, Opts.PrintFunctions,
  68                                             Opts.UseSymbolTable);
  69   if (Opts.Demangle)
  70     LineInfo.FunctionName = DemangleName(LineInfo.FunctionName, Info);
  71   return LineInfo;
  72 }
  73
  74 Expected<DILineInfo>
  75 LLVMSymbolizer::symbolizeCode(const ObjectFile &Obj,
  76                               object::SectionedAddress ModuleOffset) {
  77   StringRef ModuleName = Obj.getFileName();
  78   auto I = Modules.find(ModuleName);
  79   if (I != Modules.end())
  80     return symbolizeCodeCommon(I->second.get(), ModuleOffset);
  81
  82   std::unique_ptr<DIContext> Context =
  83         DWARFContext::create(Obj, nullptr, DWARFContext::defaultErrorHandler);
  84   Expected<SymbolizableModule *> InfoOrErr =
  85                      createModuleInfo(&Obj, std::move(Context), ModuleName);
  86   if (!InfoOrErr)
  87     return InfoOrErr.takeError();
  88   return symbolizeCodeCommon(*InfoOrErr, ModuleOffset);
  89 }
  90
  91 Expected<DILineInfo>
  92 LLVMSymbolizer::symbolizeCode(const std::string &ModuleName,
  93                               object::SectionedAddress ModuleOffset) {
  94   Expected<SymbolizableModule *> InfoOrErr = getOrCreateModuleInfo(ModuleName);
  95   if (!InfoOrErr)
  96     return InfoOrErr.takeError();
  97   return symbolizeCodeCommon(*InfoOrErr, ModuleOffset);
  98 }
  99
 100 Expected<DIInliningInfo>
 101 LLVMSymbolizer::symbolizeInlinedCode(const std::string &ModuleName,
 102                                      object::SectionedAddress ModuleOffset) {
 103   SymbolizableModule *Info;
 104   if (auto InfoOrErr = getOrCreateModuleInfo(ModuleName))
 105     Info = InfoOrErr.get();
 106   else
 107     return InfoOrErr.takeError();
 108
 109   // A null module means an error has already been reported. Return an empty
 110   // result.
 111   if (!Info)
 112     return DIInliningInfo();
 113
 114   // If the user is giving us relative addresses, add the preferred base of the
 115   // object to the offset before we do the query. It's what DIContext expects.
 116   if (Opts.RelativeAddresses)
 117     ModuleOffset.Address += Info->getModulePreferredBase();
 118
 119   DIInliningInfo InlinedContext = Info->symbolizeInlinedCode(
 120       ModuleOffset, Opts.PrintFunctions, Opts.UseSymbolTable);
 121   if (Opts.Demangle) {
 122     for (int i = 0, n = InlinedContext.getNumberOfFrames(); i < n; i++) {
 123       auto *Frame = InlinedContext.getMutableFrame(i);
 124       Frame->FunctionName = DemangleName(Frame->FunctionName, Info);
 125     }
 126   }
 127   return InlinedContext;
 128 }
 129
 130 Expected<DIGlobal>
 131 LLVMSymbolizer::symbolizeData(const std::string &ModuleName,
 132                               object::SectionedAddress ModuleOffset) {
 133   SymbolizableModule *Info;
 134   if (auto InfoOrErr = getOrCreateModuleInfo(ModuleName))
 135     Info = InfoOrErr.get();
 136   else
 137     return InfoOrErr.takeError();
 138
 139   // A null module means an error has already been reported. Return an empty
 140   // result.
 141   if (!Info)
 142     return DIGlobal();
 143
 144   // If the user is giving us relative addresses, add the preferred base of
 145   // the object to the offset before we do the query. It's what DIContext
 146   // expects.
 147   if (Opts.RelativeAddresses)
 148     ModuleOffset.Address += Info->getModulePreferredBase();
 149
 150   DIGlobal Global = Info->symbolizeData(ModuleOffset);
 151   if (Opts.Demangle)
 152     Global.Name = DemangleName(Global.Name, Info);
 153   return Global;
 154 }
 155
 156 Expected<std::vector<DILocal>>
 157 LLVMSymbolizer::symbolizeFrame(const std::string &ModuleName,
 158                                object::SectionedAddress ModuleOffset) {
 159   SymbolizableModule *Info;
 160   if (auto InfoOrErr = getOrCreateModuleInfo(ModuleName))
 161     Info = InfoOrErr.get();
 162   else
 163     return InfoOrErr.takeError();
 164
 165   // A null module means an error has already been reported. Return an empty
 166   // result.
 167   if (!Info)
 168     return std::vector<DILocal>();
 169
 170   // If the user is giving us relative addresses, add the preferred base of
 171   // the object to the offset before we do the query. It's what DIContext
 172   // expects.
 173   if (Opts.RelativeAddresses)
 174     ModuleOffset.Address += Info->getModulePreferredBase();
 175
 176   return Info->symbolizeFrame(ModuleOffset);
 177 }
 178
 179 void LLVMSymbolizer::flush() {
 180   ObjectForUBPathAndArch.clear();
 181   BinaryForPath.clear();
 182   ObjectPairForPathArch.clear();
 183   Modules.clear();
 184 }
 185
 186 namespace {
 187
 188 // For Path="/path/to/foo" and Basename="foo" assume that debug info is in
 189 // /path/to/foo.dSYM/Contents/Resources/DWARF/foo.
 190 // For Path="/path/to/bar.dSYM" and Basename="foo" assume that debug info is in
 191 // /path/to/bar.dSYM/Contents/Resources/DWARF/foo.
 192 std::string getDarwinDWARFResourceForPath(
 193     const std::string &Path, const std::string &Basename) {
 194   SmallString<16> ResourceName = StringRef(Path);
 195   if (sys::path::extension(Path) != ".dSYM") {
 196     ResourceName += ".dSYM";
 197   }
 198   sys::path::append(ResourceName, "Contents", "Resources", "DWARF");
 199   sys::path::append(ResourceName, Basename);
 200   return ResourceName.str();
 201 }
 202
 203 bool checkFileCRC(StringRef Path, uint32_t CRCHash) {
 204   ErrorOr<std::unique_ptr<MemoryBuffer>> MB =
 205       MemoryBuffer::getFileOrSTDIN(Path);
 206   if (!MB)
 207     return false;
 208   return CRCHash == llvm::crc32(0, MB.get()->getBuffer());
 209 }
 210
 211 bool findDebugBinary(const std::string &OrigPath,
 212                      const std::string &DebuglinkName, uint32_t CRCHash,
 213                      const std::string &FallbackDebugPath,
 214                      std::string &Result) {
 215   SmallString<16> OrigDir(OrigPath);
 216   llvm::sys::path::remove_filename(OrigDir);
 217   SmallString<16> DebugPath = OrigDir;
 218   // Try relative/path/to/original_binary/debuglink_name
 219   llvm::sys::path::append(DebugPath, DebuglinkName);
 220   if (checkFileCRC(DebugPath, CRCHash)) {
 221     Result = DebugPath.str();
 222     return true;
 223   }
 224   // Try relative/path/to/original_binary/.debug/debuglink_name
 225   DebugPath = OrigDir;
 226   llvm::sys::path::append(DebugPath, ".debug", DebuglinkName);
 227   if (checkFileCRC(DebugPath, CRCHash)) {
 228     Result = DebugPath.str();
 229     return true;
 230   }
 231   // Make the path absolute so that lookups will go to
 232   // "/usr/lib/debug/full/path/to/debug", not
 233   // "/usr/lib/debug/to/debug"
 234   llvm::sys::fs::make_absolute(OrigDir);
 235   if (!FallbackDebugPath.empty()) {
 236     // Try <FallbackDebugPath>/absolute/path/to/original_binary/debuglink_name
 237     DebugPath = FallbackDebugPath;
 238   } else {
 239 #if defined(__NetBSD__)
 240     // Try /usr/libdata/debug/absolute/path/to/original_binary/debuglink_name
 241     DebugPath = "/usr/libdata/debug";
 242 #else
 243     // Try /usr/lib/debug/absolute/path/to/original_binary/debuglink_name
 244     DebugPath = "/usr/lib/debug";
 245 #endif
 246   }
 247   llvm::sys::path::append(DebugPath, llvm::sys::path::relative_path(OrigDir),
 248                           DebuglinkName);
 249   if (checkFileCRC(DebugPath, CRCHash)) {
 250     Result = DebugPath.str();
 251     return true;
 252   }
 253   return false;
 254 }
 255
 256 bool getGNUDebuglinkContents(const ObjectFile *Obj, std::string &DebugName,
 257                              uint32_t &CRCHash) {
 258   if (!Obj)
 259     return false;
 260   for (const SectionRef &Section : Obj->sections()) {
 261     StringRef Name;
 262     if (Expected<StringRef> NameOrErr = Section.getName())
 263       Name = *NameOrErr;
 264     else
 265       consumeError(NameOrErr.takeError());
 266
 267     Name = Name.substr(Name.find_first_not_of("._"));
 268     if (Name == "gnu_debuglink") {
 269       Expected<StringRef> ContentsOrErr = Section.getContents();
 270       if (!ContentsOrErr) {
 271         consumeError(ContentsOrErr.takeError());
 272         return false;
 273       }
 274       DataExtractor DE(*ContentsOrErr, Obj->isLittleEndian(), 0);
 275       uint64_t Offset = 0;
 276       if (const char *DebugNameStr = DE.getCStr(&Offset)) {
 277         // 4-byte align the offset.
 278         Offset = (Offset + 3) & ~0x3;
 279         if (DE.isValidOffsetForDataOfSize(Offset, 4)) {
 280           DebugName = DebugNameStr;
 281           CRCHash = DE.getU32(&Offset);
 282           return true;
 283         }
 284       }
 285       break;
 286     }
 287   }
 288   return false;
 289 }
 290
 291 bool darwinDsymMatchesBinary(const MachOObjectFile *DbgObj,
 292                              const MachOObjectFile *Obj) {
 293   ArrayRef<uint8_t> dbg_uuid = DbgObj->getUuid();
 294   ArrayRef<uint8_t> bin_uuid = Obj->getUuid();
 295   if (dbg_uuid.empty() || bin_uuid.empty())
 296     return false;
 297   return !memcmp(dbg_uuid.data(), bin_uuid.data(), dbg_uuid.size());
 298 }
 299
 300 } // end anonymous namespace
 301
 302 ObjectFile *LLVMSymbolizer::lookUpDsymFile(const std::string &ExePath,
 303     const MachOObjectFile *MachExeObj, const std::string &ArchName) {
 304   // On Darwin we may find DWARF in separate object file in
 305   // resource directory.
 306   std::vector<std::string> DsymPaths;
 307   StringRef Filename = sys::path::filename(ExePath);
 308   DsymPaths.push_back(getDarwinDWARFResourceForPath(ExePath, Filename));
 309   for (const auto &Path : Opts.DsymHints) {
 310     DsymPaths.push_back(getDarwinDWARFResourceForPath(Path, Filename));
 311   }
 312   for (const auto &Path : DsymPaths) {
 313     auto DbgObjOrErr = getOrCreateObject(Path, ArchName);
 314     if (!DbgObjOrErr) {
 315       // Ignore errors, the file might not exist.
 316       consumeError(DbgObjOrErr.takeError());
 317       continue;
 318     }
 319     ObjectFile *DbgObj = DbgObjOrErr.get();
 320     if (!DbgObj)
 321       continue;
 322     const MachOObjectFile *MachDbgObj = dyn_cast<const MachOObjectFile>(DbgObj);
 323     if (!MachDbgObj)
 324       continue;
 325     if (darwinDsymMatchesBinary(MachDbgObj, MachExeObj))
 326       return DbgObj;
 327   }
 328   return nullptr;
 329 }
 330
 331 ObjectFile *LLVMSymbolizer::lookUpDebuglinkObject(const std::string &Path,
 332                                                   const ObjectFile *Obj,
 333                                                   const std::string &ArchName) {
 334   std::string DebuglinkName;
 335   uint32_t CRCHash;
 336   std::string DebugBinaryPath;
 337   if (!getGNUDebuglinkContents(Obj, DebuglinkName, CRCHash))
 338     return nullptr;
 339   if (!findDebugBinary(Path, DebuglinkName, CRCHash, Opts.FallbackDebugPath,
 340                        DebugBinaryPath))
 341     return nullptr;
 342   auto DbgObjOrErr = getOrCreateObject(DebugBinaryPath, ArchName);
 343   if (!DbgObjOrErr) {
 344     // Ignore errors, the file might not exist.
 345     consumeError(DbgObjOrErr.takeError());
 346     return nullptr;
 347   }
 348   return DbgObjOrErr.get();
 349 }
 350
 351 Expected<LLVMSymbolizer::ObjectPair>
 352 LLVMSymbolizer::getOrCreateObjectPair(const std::string &Path,
 353                                       const std::string &ArchName) {
 354   auto I = ObjectPairForPathArch.find(std::make_pair(Path, ArchName));
 355   if (I != ObjectPairForPathArch.end())
 356     return I->second;
 357
 358   auto ObjOrErr = getOrCreateObject(Path, ArchName);
 359   if (!ObjOrErr) {
 360     ObjectPairForPathArch.emplace(std::make_pair(Path, ArchName),
 361                                   ObjectPair(nullptr, nullptr));
 362     return ObjOrErr.takeError();
 363   }
 364
 365   ObjectFile *Obj = ObjOrErr.get();
 366   assert(Obj != nullptr);
 367   ObjectFile *DbgObj = nullptr;
 368
 369   if (auto MachObj = dyn_cast<const MachOObjectFile>(Obj))
 370     DbgObj = lookUpDsymFile(Path, MachObj, ArchName);
 371   if (!DbgObj)
 372     DbgObj = lookUpDebuglinkObject(Path, Obj, ArchName);
 373   if (!DbgObj)
 374     DbgObj = Obj;
 375   ObjectPair Res = std::make_pair(Obj, DbgObj);
 376   ObjectPairForPathArch.emplace(std::make_pair(Path, ArchName), Res);
 377   return Res;
 378 }
 379
 380 Expected<ObjectFile *>
 381 LLVMSymbolizer::getOrCreateObject(const std::string &Path,
 382                                   const std::string &ArchName) {
 383   Binary *Bin;
 384   auto Pair = BinaryForPath.emplace(Path, OwningBinary<Binary>());
 385   if (!Pair.second) {
 386     Bin = Pair.first->second.getBinary();
 387   } else {
 388     Expected<OwningBinary<Binary>> BinOrErr = createBinary(Path);
 389     if (!BinOrErr)
 390       return BinOrErr.takeError();
 391     Pair.first->second = std::move(BinOrErr.get());
 392     Bin = Pair.first->second.getBinary();
 393   }
 394
 395   if (!Bin)
 396     return static_cast<ObjectFile *>(nullptr);
 397
 398   if (MachOUniversalBinary *UB = dyn_cast_or_null<MachOUniversalBinary>(Bin)) {
 399     auto I = ObjectForUBPathAndArch.find(std::make_pair(Path, ArchName));
 400     if (I != ObjectForUBPathAndArch.end())
 401       return I->second.get();
 402
 403     Expected<std::unique_ptr<ObjectFile>> ObjOrErr =
 404         UB->getObjectForArch(ArchName);
 405     if (!ObjOrErr) {
 406       ObjectForUBPathAndArch.emplace(std::make_pair(Path, ArchName),
 407                                      std::unique_ptr<ObjectFile>());
 408       return ObjOrErr.takeError();
 409     }
 410     ObjectFile *Res = ObjOrErr->get();
 411     ObjectForUBPathAndArch.emplace(std::make_pair(Path, ArchName),
 412                                    std::move(ObjOrErr.get()));
 413     return Res;
 414   }
 415   if (Bin->isObject()) {
 416     return cast<ObjectFile>(Bin);
 417   }
 418   return errorCodeToError(object_error::arch_not_found);
 419 }
 420
 421 Expected<SymbolizableModule *>
 422 LLVMSymbolizer::createModuleInfo(const ObjectFile *Obj,
 423                                  std::unique_ptr<DIContext> Context,
 424                                  StringRef ModuleName) {
 425   auto InfoOrErr = SymbolizableObjectFile::create(Obj, std::move(Context),
 426                                                   Opts.UntagAddresses);
 427   std::unique_ptr<SymbolizableModule> SymMod;
 428   if (InfoOrErr)
 429     SymMod = std::move(*InfoOrErr);
 430   auto InsertResult =
 431       Modules.insert(std::make_pair(ModuleName, std::move(SymMod)));
 432   assert(InsertResult.second);
 433   if (std::error_code EC = InfoOrErr.getError())
 434     return errorCodeToError(EC);
 435   return InsertResult.first->second.get();
 436 }
 437
 438 Expected<SymbolizableModule *>
 439 LLVMSymbolizer::getOrCreateModuleInfo(const std::string &ModuleName) {
 440   auto I = Modules.find(ModuleName);
 441   if (I != Modules.end())
 442     return I->second.get();
 443
 444   std::string BinaryName = ModuleName;
 445   std::string ArchName = Opts.DefaultArch;
 446   size_t ColonPos = ModuleName.find_last_of(':');
 447   // Verify that substring after colon form a valid arch name.
 448   if (ColonPos != std::string::npos) {
 449     std::string ArchStr = ModuleName.substr(ColonPos + 1);
 450     if (Triple(ArchStr).getArch() != Triple::UnknownArch) {
 451       BinaryName = ModuleName.substr(0, ColonPos);
 452       ArchName = ArchStr;
 453     }
 454   }
 455   auto ObjectsOrErr = getOrCreateObjectPair(BinaryName, ArchName);
 456   if (!ObjectsOrErr) {
 457     // Failed to find valid object file.
 458     Modules.emplace(ModuleName, std::unique_ptr<SymbolizableModule>());
 459     return ObjectsOrErr.takeError();
 460   }
 461   ObjectPair Objects = ObjectsOrErr.get();
 462
 463   std::unique_ptr<DIContext> Context;
 464   // If this is a COFF object containing PDB info, use a PDBContext to
 465   // symbolize. Otherwise, use DWARF.
 466   if (auto CoffObject = dyn_cast<COFFObjectFile>(Objects.first)) {
 467     const codeview::DebugInfo *DebugInfo;
 468     StringRef PDBFileName;
 469     auto EC = CoffObject->getDebugPDBInfo(DebugInfo, PDBFileName);
 470     if (!EC && DebugInfo != nullptr && !PDBFileName.empty()) {
 471       using namespace pdb;
 472       std::unique_ptr<IPDBSession> Session;
 473       if (auto Err = loadDataForEXE(PDB_ReaderType::DIA,
 474                                     Objects.first->getFileName(), Session)) {
 475         Modules.emplace(ModuleName, std::unique_ptr<SymbolizableModule>());
 476         // Return along the PDB filename to provide more context
 477         return createFileError(PDBFileName, std::move(Err));
 478       }
 479       Context.reset(new PDBContext(*CoffObject, std::move(Session)));
 480     }
 481   }
 482   if (!Context)
 483     Context =
 484         DWARFContext::create(*Objects.second, nullptr,
 485                              DWARFContext::defaultErrorHandler, Opts.DWPName);
 486   return createModuleInfo(Objects.first, std::move(Context), ModuleName);
 487 }
 488
 489 namespace {
 490
 491 // Undo these various manglings for Win32 extern "C" functions:
 492 // cdecl       - _foo
 493 // stdcall     - _foo@12
 494 // fastcall    - @foo@12
 495 // vectorcall  - foo@@12
 496 // These are all different linkage names for 'foo'.
 497 StringRef demanglePE32ExternCFunc(StringRef SymbolName) {
 498   // Remove any '_' or '@' prefix.
 499   char Front = SymbolName.empty() ? '\0' : SymbolName[0];
 500   if (Front == '_' || Front == '@')
 501     SymbolName = SymbolName.drop_front();
 502
 503   // Remove any '@[0-9]+' suffix.
 504   if (Front != '?') {
 505     size_t AtPos = SymbolName.rfind('@');
 506     if (AtPos != StringRef::npos &&
 507         std::all_of(SymbolName.begin() + AtPos + 1, SymbolName.end(),
 508                     [](char C) { return C >= '0' && C <= '9'; })) {
 509       SymbolName = SymbolName.substr(0, AtPos);
 510     }
 511   }
 512
 513   // Remove any ending '@' for vectorcall.
 514   if (SymbolName.endswith("@"))
 515     SymbolName = SymbolName.drop_back();
 516
 517   return SymbolName;
 518 }
 519
 520 } // end anonymous namespace
 521
 522 std::string
 523 LLVMSymbolizer::DemangleName(const std::string &Name,
 524                              const SymbolizableModule *DbiModuleDescriptor) {
 525   // We can spoil names of symbols with C linkage, so use an heuristic
 526   // approach to check if the name should be demangled.
 527   if (Name.substr(0, 2) == "_Z") {
 528     int status = 0;
 529     char *DemangledName = itaniumDemangle(Name.c_str(), nullptr, nullptr, &status);
 530     if (status != 0)
 531       return Name;
 532     std::string Result = DemangledName;
 533     free(DemangledName);
 534     return Result;
 535   }
 536
 537 #if defined(_MSC_VER)
 538   if (!Name.empty() && Name.front() == '?') {
 539     // Only do MSVC C++ demangling on symbols starting with '?'.
 540     char DemangledName[1024] = {0};
 541     DWORD result = ::UnDecorateSymbolName(
 542         Name.c_str(), DemangledName, 1023,
 543         UNDNAME_NO_ACCESS_SPECIFIERS |       // Strip public, private, protected
 544             UNDNAME_NO_ALLOCATION_LANGUAGE | // Strip __thiscall, __stdcall, etc
 545             UNDNAME_NO_THROW_SIGNATURES |    // Strip throw() specifications
 546             UNDNAME_NO_MEMBER_TYPE | // Strip virtual, static, etc specifiers
 547             UNDNAME_NO_MS_KEYWORDS | // Strip all MS extension keywords
 548             UNDNAME_NO_FUNCTION_RETURNS); // Strip function return types
 549     return (result == 0) ? Name : std::string(DemangledName);
 550   }
 551 #endif
 552   if (DbiModuleDescriptor && DbiModuleDescriptor->isWin32Module())
 553     return std::string(demanglePE32ExternCFunc(Name));
 554   return Name;
 555 }
 556
 557 } // namespace symbolize
 558 } // namespace llvm