tools/llvm-cxxdump/llvm-cxxdump.cpp

   1 //===- llvm-cxxdump.cpp - Dump C++ data in an Object File -------*- C++ -*-===//
   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 // Dumps C++ data resident in object files and archives.
  10 //
  11 //===----------------------------------------------------------------------===//
  12
  13 #include "llvm-cxxdump.h"
  14 #include "Error.h"
  15 #include "llvm/ADT/ArrayRef.h"
  16 #include "llvm/Object/Archive.h"
  17 #include "llvm/Object/ObjectFile.h"
  18 #include "llvm/Object/SymbolSize.h"
  19 #include "llvm/Support/Debug.h"
  20 #include "llvm/Support/Endian.h"
  21 #include "llvm/Support/FileSystem.h"
  22 #include "llvm/Support/InitLLVM.h"
  23 #include "llvm/Support/TargetRegistry.h"
  24 #include "llvm/Support/TargetSelect.h"
  25 #include "llvm/Support/WithColor.h"
  26 #include "llvm/Support/raw_ostream.h"
  27 #include <map>
  28 #include <string>
  29 #include <system_error>
  30
  31 using namespace llvm;
  32 using namespace llvm::object;
  33 using namespace llvm::support;
  34
  35 namespace opts {
  36 cl::list<std::string> InputFilenames(cl::Positional,
  37                                      cl::desc("<input object files>"),
  38                                      cl::ZeroOrMore);
  39 } // namespace opts
  40
  41 namespace llvm {
  42
  43 static void error(std::error_code EC) {
  44   if (!EC)
  45     return;
  46   WithColor::error(outs(), "") << "reading file: " << EC.message() << ".\n";
  47   outs().flush();
  48   exit(1);
  49 }
  50
  51 LLVM_ATTRIBUTE_NORETURN static void error(Error Err) {
  52   logAllUnhandledErrors(std::move(Err), WithColor::error(outs()),
  53                         "reading file: ");
  54   outs().flush();
  55   exit(1);
  56 }
  57
  58 template <typename T>
  59 T unwrapOrError(Expected<T> EO) {
  60   if (!EO)
  61     error(EO.takeError());
  62   return std::move(*EO);
  63 }
  64
  65 } // namespace llvm
  66
  67 static void reportError(StringRef Input, StringRef Message) {
  68   if (Input == "-")
  69     Input = "<stdin>";
  70   WithColor::error(errs(), Input) << Message << "\n";
  71   errs().flush();
  72   exit(1);
  73 }
  74
  75 static void reportError(StringRef Input, std::error_code EC) {
  76   reportError(Input, EC.message());
  77 }
  78
  79 static std::map<SectionRef, SmallVector<SectionRef, 1>> SectionRelocMap;
  80
  81 static void collectRelocatedSymbols(const ObjectFile *Obj,
  82                                     const SectionRef &Sec, uint64_t SecAddress,
  83                                     uint64_t SymAddress, uint64_t SymSize,
  84                                     StringRef *I, StringRef *E) {
  85   uint64_t SymOffset = SymAddress - SecAddress;
  86   uint64_t SymEnd = SymOffset + SymSize;
  87   for (const SectionRef &SR : SectionRelocMap[Sec]) {
  88     for (const object::RelocationRef &Reloc : SR.relocations()) {
  89       if (I == E)
  90         break;
  91       const object::symbol_iterator RelocSymI = Reloc.getSymbol();
  92       if (RelocSymI == Obj->symbol_end())
  93         continue;
  94       Expected<StringRef> RelocSymName = RelocSymI->getName();
  95       error(errorToErrorCode(RelocSymName.takeError()));
  96       uint64_t Offset = Reloc.getOffset();
  97       if (Offset >= SymOffset && Offset < SymEnd) {
  98         *I = *RelocSymName;
  99         ++I;
 100       }
 101     }
 102   }
 103 }
 104
 105 static void collectRelocationOffsets(
 106     const ObjectFile *Obj, const SectionRef &Sec, uint64_t SecAddress,
 107     uint64_t SymAddress, uint64_t SymSize, StringRef SymName,
 108     std::map<std::pair<StringRef, uint64_t>, StringRef> &Collection) {
 109   uint64_t SymOffset = SymAddress - SecAddress;
 110   uint64_t SymEnd = SymOffset + SymSize;
 111   for (const SectionRef &SR : SectionRelocMap[Sec]) {
 112     for (const object::RelocationRef &Reloc : SR.relocations()) {
 113       const object::symbol_iterator RelocSymI = Reloc.getSymbol();
 114       if (RelocSymI == Obj->symbol_end())
 115         continue;
 116       Expected<StringRef> RelocSymName = RelocSymI->getName();
 117       error(errorToErrorCode(RelocSymName.takeError()));
 118       uint64_t Offset = Reloc.getOffset();
 119       if (Offset >= SymOffset && Offset < SymEnd)
 120         Collection[std::make_pair(SymName, Offset - SymOffset)] = *RelocSymName;
 121     }
 122   }
 123 }
 124
 125 static void dumpCXXData(const ObjectFile *Obj) {
 126   struct CompleteObjectLocator {
 127     StringRef Symbols[2];
 128     ArrayRef<little32_t> Data;
 129   };
 130   struct ClassHierarchyDescriptor {
 131     StringRef Symbols[1];
 132     ArrayRef<little32_t> Data;
 133   };
 134   struct BaseClassDescriptor {
 135     StringRef Symbols[2];
 136     ArrayRef<little32_t> Data;
 137   };
 138   struct TypeDescriptor {
 139     StringRef Symbols[1];
 140     uint64_t AlwaysZero;
 141     StringRef MangledName;
 142   };
 143   struct ThrowInfo {
 144     uint32_t Flags;
 145   };
 146   struct CatchableTypeArray {
 147     uint32_t NumEntries;
 148   };
 149   struct CatchableType {
 150     uint32_t Flags;
 151     uint32_t NonVirtualBaseAdjustmentOffset;
 152     int32_t VirtualBasePointerOffset;
 153     uint32_t VirtualBaseAdjustmentOffset;
 154     uint32_t Size;
 155     StringRef Symbols[2];
 156   };
 157   std::map<std::pair<StringRef, uint64_t>, StringRef> VFTableEntries;
 158   std::map<std::pair<StringRef, uint64_t>, StringRef> TIEntries;
 159   std::map<std::pair<StringRef, uint64_t>, StringRef> CTAEntries;
 160   std::map<StringRef, ArrayRef<little32_t>> VBTables;
 161   std::map<StringRef, CompleteObjectLocator> COLs;
 162   std::map<StringRef, ClassHierarchyDescriptor> CHDs;
 163   std::map<std::pair<StringRef, uint64_t>, StringRef> BCAEntries;
 164   std::map<StringRef, BaseClassDescriptor> BCDs;
 165   std::map<StringRef, TypeDescriptor> TDs;
 166   std::map<StringRef, ThrowInfo> TIs;
 167   std::map<StringRef, CatchableTypeArray> CTAs;
 168   std::map<StringRef, CatchableType> CTs;
 169
 170   std::map<std::pair<StringRef, uint64_t>, StringRef> VTableSymEntries;
 171   std::map<std::pair<StringRef, uint64_t>, int64_t> VTableDataEntries;
 172   std::map<std::pair<StringRef, uint64_t>, StringRef> VTTEntries;
 173   std::map<StringRef, StringRef> TINames;
 174
 175   SectionRelocMap.clear();
 176   for (const SectionRef &Section : Obj->sections()) {
 177     section_iterator Sec2 = Section.getRelocatedSection();
 178     if (Sec2 != Obj->section_end())
 179       SectionRelocMap[*Sec2].push_back(Section);
 180   }
 181
 182   uint8_t BytesInAddress = Obj->getBytesInAddress();
 183
 184   std::vector<std::pair<SymbolRef, uint64_t>> SymAddr =
 185       object::computeSymbolSizes(*Obj);
 186
 187   for (auto &P : SymAddr) {
 188     object::SymbolRef Sym = P.first;
 189     uint64_t SymSize = P.second;
 190     Expected<StringRef> SymNameOrErr = Sym.getName();
 191     error(errorToErrorCode(SymNameOrErr.takeError()));
 192     StringRef SymName = *SymNameOrErr;
 193     Expected<object::section_iterator> SecIOrErr = Sym.getSection();
 194     error(errorToErrorCode(SecIOrErr.takeError()));
 195     object::section_iterator SecI = *SecIOrErr;
 196     // Skip external symbols.
 197     if (SecI == Obj->section_end())
 198       continue;
 199     const SectionRef &Sec = *SecI;
 200     // Skip virtual or BSS sections.
 201     if (Sec.isBSS() || Sec.isVirtual())
 202       continue;
 203     StringRef SecContents = unwrapOrError(Sec.getContents());
 204     Expected<uint64_t> SymAddressOrErr = Sym.getAddress();
 205     error(errorToErrorCode(SymAddressOrErr.takeError()));
 206     uint64_t SymAddress = *SymAddressOrErr;
 207     uint64_t SecAddress = Sec.getAddress();
 208     uint64_t SecSize = Sec.getSize();
 209     uint64_t SymOffset = SymAddress - SecAddress;
 210     StringRef SymContents = SecContents.substr(SymOffset, SymSize);
 211
 212     // VFTables in the MS-ABI start with '??_7' and are contained within their
 213     // own COMDAT section.  We then determine the contents of the VFTable by
 214     // looking at each relocation in the section.
 215     if (SymName.startswith("??_7")) {
 216       // Each relocation either names a virtual method or a thunk.  We note the
 217       // offset into the section and the symbol used for the relocation.
 218       collectRelocationOffsets(Obj, Sec, SecAddress, SecAddress, SecSize,
 219                                SymName, VFTableEntries);
 220     }
 221     // VBTables in the MS-ABI start with '??_8' and are filled with 32-bit
 222     // offsets of virtual bases.
 223     else if (SymName.startswith("??_8")) {
 224       ArrayRef<little32_t> VBTableData(
 225           reinterpret_cast<const little32_t *>(SymContents.data()),
 226           SymContents.size() / sizeof(little32_t));
 227       VBTables[SymName] = VBTableData;
 228     }
 229     // Complete object locators in the MS-ABI start with '??_R4'
 230     else if (SymName.startswith("??_R4")) {
 231       CompleteObjectLocator COL;
 232       COL.Data = makeArrayRef(
 233           reinterpret_cast<const little32_t *>(SymContents.data()), 3);
 234       StringRef *I = std::begin(COL.Symbols), *E = std::end(COL.Symbols);
 235       collectRelocatedSymbols(Obj, Sec, SecAddress, SymAddress, SymSize, I, E);
 236       COLs[SymName] = COL;
 237     }
 238     // Class hierarchy descriptors in the MS-ABI start with '??_R3'
 239     else if (SymName.startswith("??_R3")) {
 240       ClassHierarchyDescriptor CHD;
 241       CHD.Data = makeArrayRef(
 242           reinterpret_cast<const little32_t *>(SymContents.data()), 3);
 243       StringRef *I = std::begin(CHD.Symbols), *E = std::end(CHD.Symbols);
 244       collectRelocatedSymbols(Obj, Sec, SecAddress, SymAddress, SymSize, I, E);
 245       CHDs[SymName] = CHD;
 246     }
 247     // Class hierarchy descriptors in the MS-ABI start with '??_R2'
 248     else if (SymName.startswith("??_R2")) {
 249       // Each relocation names a base class descriptor.  We note the offset into
 250       // the section and the symbol used for the relocation.
 251       collectRelocationOffsets(Obj, Sec, SecAddress, SymAddress, SymSize,
 252                                SymName, BCAEntries);
 253     }
 254     // Base class descriptors in the MS-ABI start with '??_R1'
 255     else if (SymName.startswith("??_R1")) {
 256       BaseClassDescriptor BCD;
 257       BCD.Data = makeArrayRef(
 258           reinterpret_cast<const little32_t *>(SymContents.data()) + 1, 5);
 259       StringRef *I = std::begin(BCD.Symbols), *E = std::end(BCD.Symbols);
 260       collectRelocatedSymbols(Obj, Sec, SecAddress, SymAddress, SymSize, I, E);
 261       BCDs[SymName] = BCD;
 262     }
 263     // Type descriptors in the MS-ABI start with '??_R0'
 264     else if (SymName.startswith("??_R0")) {
 265       const char *DataPtr = SymContents.drop_front(BytesInAddress).data();
 266       TypeDescriptor TD;
 267       if (BytesInAddress == 8)
 268         TD.AlwaysZero = *reinterpret_cast<const little64_t *>(DataPtr);
 269       else
 270         TD.AlwaysZero = *reinterpret_cast<const little32_t *>(DataPtr);
 271       TD.MangledName = SymContents.drop_front(BytesInAddress * 2);
 272       StringRef *I = std::begin(TD.Symbols), *E = std::end(TD.Symbols);
 273       collectRelocatedSymbols(Obj, Sec, SecAddress, SymAddress, SymSize, I, E);
 274       TDs[SymName] = TD;
 275     }
 276     // Throw descriptors in the MS-ABI start with '_TI'
 277     else if (SymName.startswith("_TI") || SymName.startswith("__TI")) {
 278       ThrowInfo TI;
 279       TI.Flags = *reinterpret_cast<const little32_t *>(SymContents.data());
 280       collectRelocationOffsets(Obj, Sec, SecAddress, SymAddress, SymSize,
 281                                SymName, TIEntries);
 282       TIs[SymName] = TI;
 283     }
 284     // Catchable type arrays in the MS-ABI start with _CTA or __CTA.
 285     else if (SymName.startswith("_CTA") || SymName.startswith("__CTA")) {
 286       CatchableTypeArray CTA;
 287       CTA.NumEntries =
 288           *reinterpret_cast<const little32_t *>(SymContents.data());
 289       collectRelocationOffsets(Obj, Sec, SecAddress, SymAddress, SymSize,
 290                                SymName, CTAEntries);
 291       CTAs[SymName] = CTA;
 292     }
 293     // Catchable types in the MS-ABI start with _CT or __CT.
 294     else if (SymName.startswith("_CT") || SymName.startswith("__CT")) {
 295       const little32_t *DataPtr =
 296           reinterpret_cast<const little32_t *>(SymContents.data());
 297       CatchableType CT;
 298       CT.Flags = DataPtr[0];
 299       CT.NonVirtualBaseAdjustmentOffset = DataPtr[2];
 300       CT.VirtualBasePointerOffset = DataPtr[3];
 301       CT.VirtualBaseAdjustmentOffset = DataPtr[4];
 302       CT.Size = DataPtr[5];
 303       StringRef *I = std::begin(CT.Symbols), *E = std::end(CT.Symbols);
 304       collectRelocatedSymbols(Obj, Sec, SecAddress, SymAddress, SymSize, I, E);
 305       CTs[SymName] = CT;
 306     }
 307     // Construction vtables in the Itanium ABI start with '_ZTT' or '__ZTT'.
 308     else if (SymName.startswith("_ZTT") || SymName.startswith("__ZTT")) {
 309       collectRelocationOffsets(Obj, Sec, SecAddress, SymAddress, SymSize,
 310                                SymName, VTTEntries);
 311     }
 312     // Typeinfo names in the Itanium ABI start with '_ZTS' or '__ZTS'.
 313     else if (SymName.startswith("_ZTS") || SymName.startswith("__ZTS")) {
 314       TINames[SymName] = SymContents.slice(0, SymContents.find('\0'));
 315     }
 316     // Vtables in the Itanium ABI start with '_ZTV' or '__ZTV'.
 317     else if (SymName.startswith("_ZTV") || SymName.startswith("__ZTV")) {
 318       collectRelocationOffsets(Obj, Sec, SecAddress, SymAddress, SymSize,
 319                                SymName, VTableSymEntries);
 320       for (uint64_t SymOffI = 0; SymOffI < SymSize; SymOffI += BytesInAddress) {
 321         auto Key = std::make_pair(SymName, SymOffI);
 322         if (VTableSymEntries.count(Key))
 323           continue;
 324         const char *DataPtr =
 325             SymContents.substr(SymOffI, BytesInAddress).data();
 326         int64_t VData;
 327         if (BytesInAddress == 8)
 328           VData = *reinterpret_cast<const little64_t *>(DataPtr);
 329         else
 330           VData = *reinterpret_cast<const little32_t *>(DataPtr);
 331         VTableDataEntries[Key] = VData;
 332       }
 333     }
 334     // Typeinfo structures in the Itanium ABI start with '_ZTI' or '__ZTI'.
 335     else if (SymName.startswith("_ZTI") || SymName.startswith("__ZTI")) {
 336       // FIXME: Do something with these!
 337     }
 338   }
 339   for (const auto &VFTableEntry : VFTableEntries) {
 340     StringRef VFTableName = VFTableEntry.first.first;
 341     uint64_t Offset = VFTableEntry.first.second;
 342     StringRef SymName = VFTableEntry.second;
 343     outs() << VFTableName << '[' << Offset << "]: " << SymName << '\n';
 344   }
 345   for (const auto &VBTable : VBTables) {
 346     StringRef VBTableName = VBTable.first;
 347     uint32_t Idx = 0;
 348     for (little32_t Offset : VBTable.second) {
 349       outs() << VBTableName << '[' << Idx << "]: " << Offset << '\n';
 350       Idx += sizeof(Offset);
 351     }
 352   }
 353   for (const auto &COLPair : COLs) {
 354     StringRef COLName = COLPair.first;
 355     const CompleteObjectLocator &COL = COLPair.second;
 356     outs() << COLName << "[IsImageRelative]: " << COL.Data[0] << '\n';
 357     outs() << COLName << "[OffsetToTop]: " << COL.Data[1] << '\n';
 358     outs() << COLName << "[VFPtrOffset]: " << COL.Data[2] << '\n';
 359     outs() << COLName << "[TypeDescriptor]: " << COL.Symbols[0] << '\n';
 360     outs() << COLName << "[ClassHierarchyDescriptor]: " << COL.Symbols[1]
 361            << '\n';
 362   }
 363   for (const auto &CHDPair : CHDs) {
 364     StringRef CHDName = CHDPair.first;
 365     const ClassHierarchyDescriptor &CHD = CHDPair.second;
 366     outs() << CHDName << "[AlwaysZero]: " << CHD.Data[0] << '\n';
 367     outs() << CHDName << "[Flags]: " << CHD.Data[1] << '\n';
 368     outs() << CHDName << "[NumClasses]: " << CHD.Data[2] << '\n';
 369     outs() << CHDName << "[BaseClassArray]: " << CHD.Symbols[0] << '\n';
 370   }
 371   for (const auto &BCAEntry : BCAEntries) {
 372     StringRef BCAName = BCAEntry.first.first;
 373     uint64_t Offset = BCAEntry.first.second;
 374     StringRef SymName = BCAEntry.second;
 375     outs() << BCAName << '[' << Offset << "]: " << SymName << '\n';
 376   }
 377   for (const auto &BCDPair : BCDs) {
 378     StringRef BCDName = BCDPair.first;
 379     const BaseClassDescriptor &BCD = BCDPair.second;
 380     outs() << BCDName << "[TypeDescriptor]: " << BCD.Symbols[0] << '\n';
 381     outs() << BCDName << "[NumBases]: " << BCD.Data[0] << '\n';
 382     outs() << BCDName << "[OffsetInVBase]: " << BCD.Data[1] << '\n';
 383     outs() << BCDName << "[VBPtrOffset]: " << BCD.Data[2] << '\n';
 384     outs() << BCDName << "[OffsetInVBTable]: " << BCD.Data[3] << '\n';
 385     outs() << BCDName << "[Flags]: " << BCD.Data[4] << '\n';
 386     outs() << BCDName << "[ClassHierarchyDescriptor]: " << BCD.Symbols[1]
 387            << '\n';
 388   }
 389   for (const auto &TDPair : TDs) {
 390     StringRef TDName = TDPair.first;
 391     const TypeDescriptor &TD = TDPair.second;
 392     outs() << TDName << "[VFPtr]: " << TD.Symbols[0] << '\n';
 393     outs() << TDName << "[AlwaysZero]: " << TD.AlwaysZero << '\n';
 394     outs() << TDName << "[MangledName]: ";
 395     outs().write_escaped(TD.MangledName.rtrim(StringRef("\0", 1)),
 396                          /*UseHexEscapes=*/true)
 397         << '\n';
 398   }
 399   for (const auto &TIPair : TIs) {
 400     StringRef TIName = TIPair.first;
 401     const ThrowInfo &TI = TIPair.second;
 402     auto dumpThrowInfoFlag = [&](const char *Name, uint32_t Flag) {
 403       outs() << TIName << "[Flags." << Name
 404              << "]: " << (TI.Flags & Flag ? "true" : "false") << '\n';
 405     };
 406     auto dumpThrowInfoSymbol = [&](const char *Name, int Offset) {
 407       outs() << TIName << '[' << Name << "]: ";
 408       auto Entry = TIEntries.find(std::make_pair(TIName, Offset));
 409       outs() << (Entry == TIEntries.end() ? "null" : Entry->second) << '\n';
 410     };
 411     outs() << TIName << "[Flags]: " << TI.Flags << '\n';
 412     dumpThrowInfoFlag("Const", 1);
 413     dumpThrowInfoFlag("Volatile", 2);
 414     dumpThrowInfoSymbol("CleanupFn", 4);
 415     dumpThrowInfoSymbol("ForwardCompat", 8);
 416     dumpThrowInfoSymbol("CatchableTypeArray", 12);
 417   }
 418   for (const auto &CTAPair : CTAs) {
 419     StringRef CTAName = CTAPair.first;
 420     const CatchableTypeArray &CTA = CTAPair.second;
 421
 422     outs() << CTAName << "[NumEntries]: " << CTA.NumEntries << '\n';
 423
 424     unsigned Idx = 0;
 425     for (auto I = CTAEntries.lower_bound(std::make_pair(CTAName, 0)),
 426               E = CTAEntries.upper_bound(std::make_pair(CTAName, UINT64_MAX));
 427          I != E; ++I)
 428       outs() << CTAName << '[' << Idx++ << "]: " << I->second << '\n';
 429   }
 430   for (const auto &CTPair : CTs) {
 431     StringRef CTName = CTPair.first;
 432     const CatchableType &CT = CTPair.second;
 433     auto dumpCatchableTypeFlag = [&](const char *Name, uint32_t Flag) {
 434       outs() << CTName << "[Flags." << Name
 435              << "]: " << (CT.Flags & Flag ? "true" : "false") << '\n';
 436     };
 437     outs() << CTName << "[Flags]: " << CT.Flags << '\n';
 438     dumpCatchableTypeFlag("ScalarType", 1);
 439     dumpCatchableTypeFlag("VirtualInheritance", 4);
 440     outs() << CTName << "[TypeDescriptor]: " << CT.Symbols[0] << '\n';
 441     outs() << CTName << "[NonVirtualBaseAdjustmentOffset]: "
 442            << CT.NonVirtualBaseAdjustmentOffset << '\n';
 443     outs() << CTName
 444            << "[VirtualBasePointerOffset]: " << CT.VirtualBasePointerOffset
 445            << '\n';
 446     outs() << CTName << "[VirtualBaseAdjustmentOffset]: "
 447            << CT.VirtualBaseAdjustmentOffset << '\n';
 448     outs() << CTName << "[Size]: " << CT.Size << '\n';
 449     outs() << CTName
 450            << "[CopyCtor]: " << (CT.Symbols[1].empty() ? "null" : CT.Symbols[1])
 451            << '\n';
 452   }
 453   for (const auto &VTTPair : VTTEntries) {
 454     StringRef VTTName = VTTPair.first.first;
 455     uint64_t VTTOffset = VTTPair.first.second;
 456     StringRef VTTEntry = VTTPair.second;
 457     outs() << VTTName << '[' << VTTOffset << "]: " << VTTEntry << '\n';
 458   }
 459   for (const auto &TIPair : TINames) {
 460     StringRef TIName = TIPair.first;
 461     outs() << TIName << ": " << TIPair.second << '\n';
 462   }
 463   auto VTableSymI = VTableSymEntries.begin();
 464   auto VTableSymE = VTableSymEntries.end();
 465   auto VTableDataI = VTableDataEntries.begin();
 466   auto VTableDataE = VTableDataEntries.end();
 467   for (;;) {
 468     bool SymDone = VTableSymI == VTableSymE;
 469     bool DataDone = VTableDataI == VTableDataE;
 470     if (SymDone && DataDone)
 471       break;
 472     if (!SymDone && (DataDone || VTableSymI->first < VTableDataI->first)) {
 473       StringRef VTableName = VTableSymI->first.first;
 474       uint64_t Offset = VTableSymI->first.second;
 475       StringRef VTableEntry = VTableSymI->second;
 476       outs() << VTableName << '[' << Offset << "]: ";
 477       outs() << VTableEntry;
 478       outs() << '\n';
 479       ++VTableSymI;
 480       continue;
 481     }
 482     if (!DataDone && (SymDone || VTableDataI->first < VTableSymI->first)) {
 483       StringRef VTableName = VTableDataI->first.first;
 484       uint64_t Offset = VTableDataI->first.second;
 485       int64_t VTableEntry = VTableDataI->second;
 486       outs() << VTableName << '[' << Offset << "]: ";
 487       outs() << VTableEntry;
 488       outs() << '\n';
 489       ++VTableDataI;
 490       continue;
 491     }
 492   }
 493 }
 494
 495 static void dumpArchive(const Archive *Arc) {
 496   Error Err = Error::success();
 497   for (auto &ArcC : Arc->children(Err)) {
 498     Expected<std::unique_ptr<Binary>> ChildOrErr = ArcC.getAsBinary();
 499     if (!ChildOrErr) {
 500       // Ignore non-object files.
 501       if (auto E = isNotObjectErrorInvalidFileType(ChildOrErr.takeError())) {
 502         std::string Buf;
 503         raw_string_ostream OS(Buf);
 504         logAllUnhandledErrors(std::move(E), OS);
 505         OS.flush();
 506         reportError(Arc->getFileName(), Buf);
 507       }
 508       consumeError(ChildOrErr.takeError());
 509       continue;
 510     }
 511
 512     if (ObjectFile *Obj = dyn_cast<ObjectFile>(&*ChildOrErr.get()))
 513       dumpCXXData(Obj);
 514     else
 515       reportError(Arc->getFileName(), cxxdump_error::unrecognized_file_format);
 516   }
 517   if (Err)
 518     error(std::move(Err));
 519 }
 520
 521 static void dumpInput(StringRef File) {
 522   // Attempt to open the binary.
 523   Expected<OwningBinary<Binary>> BinaryOrErr = createBinary(File);
 524   if (!BinaryOrErr) {
 525     auto EC = errorToErrorCode(BinaryOrErr.takeError());
 526     reportError(File, EC);
 527     return;
 528   }
 529   Binary &Binary = *BinaryOrErr.get().getBinary();
 530
 531   if (Archive *Arc = dyn_cast<Archive>(&Binary))
 532     dumpArchive(Arc);
 533   else if (ObjectFile *Obj = dyn_cast<ObjectFile>(&Binary))
 534     dumpCXXData(Obj);
 535   else
 536     reportError(File, cxxdump_error::unrecognized_file_format);
 537 }
 538
 539 int main(int argc, const char *argv[]) {
 540   InitLLVM X(argc, argv);
 541
 542   // Initialize targets.
 543   llvm::InitializeAllTargetInfos();
 544
 545   // Register the target printer for --version.
 546   cl::AddExtraVersionPrinter(TargetRegistry::printRegisteredTargetsForVersion);
 547
 548   cl::ParseCommandLineOptions(argc, argv, "LLVM C++ ABI Data Dumper\n");
 549
 550   // Default to stdin if no filename is specified.
 551   if (opts::InputFilenames.size() == 0)
 552     opts::InputFilenames.push_back("-");
 553
 554   llvm::for_each(opts::InputFilenames, dumpInput);
 555
 556   return EXIT_SUCCESS;
 557 }