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      1 //===- llvm-cxxdump.cpp - Dump C++ data in an Object File -------*- C++ -*-===//
      2 //
      3 //                     The LLVM Compiler Infrastructure
      4 //
      5 // This file is distributed under the University of Illinois Open Source
      6 // License. See LICENSE.TXT for details.
      7 //
      8 //===----------------------------------------------------------------------===//
      9 //
     10 // Dumps C++ data resident in object files and archives.
     11 //
     12 //===----------------------------------------------------------------------===//
     13 
     14 #include "llvm-cxxdump.h"
     15 #include "Error.h"
     16 #include "llvm/ADT/ArrayRef.h"
     17 #include "llvm/Object/Archive.h"
     18 #include "llvm/Object/ObjectFile.h"
     19 #include "llvm/Object/SymbolSize.h"
     20 #include "llvm/Support/Debug.h"
     21 #include "llvm/Support/Endian.h"
     22 #include "llvm/Support/FileSystem.h"
     23 #include "llvm/Support/ManagedStatic.h"
     24 #include "llvm/Support/PrettyStackTrace.h"
     25 #include "llvm/Support/Signals.h"
     26 #include "llvm/Support/TargetRegistry.h"
     27 #include "llvm/Support/TargetSelect.h"
     28 #include "llvm/Support/raw_ostream.h"
     29 #include <map>
     30 #include <string>
     31 #include <system_error>
     32 
     33 using namespace llvm;
     34 using namespace llvm::object;
     35 using namespace llvm::support;
     36 
     37 namespace opts {
     38 cl::list<std::string> InputFilenames(cl::Positional,
     39                                      cl::desc("<input object files>"),
     40                                      cl::ZeroOrMore);
     41 } // namespace opts
     42 
     43 namespace llvm {
     44 
     45 static void error(std::error_code EC) {
     46   if (!EC)
     47     return;
     48   outs() << "\nError reading file: " << EC.message() << ".\n";
     49   outs().flush();
     50   exit(1);
     51 }
     52 
     53 } // namespace llvm
     54 
     55 static void reportError(StringRef Input, StringRef Message) {
     56   if (Input == "-")
     57     Input = "<stdin>";
     58   errs() << Input << ": " << Message << "\n";
     59   errs().flush();
     60   exit(1);
     61 }
     62 
     63 static void reportError(StringRef Input, std::error_code EC) {
     64   reportError(Input, EC.message());
     65 }
     66 
     67 static std::map<SectionRef, SmallVector<SectionRef, 1>> SectionRelocMap;
     68 
     69 static void collectRelocatedSymbols(const ObjectFile *Obj,
     70                                     const SectionRef &Sec, uint64_t SecAddress,
     71                                     uint64_t SymAddress, uint64_t SymSize,
     72                                     StringRef *I, StringRef *E) {
     73   uint64_t SymOffset = SymAddress - SecAddress;
     74   uint64_t SymEnd = SymOffset + SymSize;
     75   for (const SectionRef &SR : SectionRelocMap[Sec]) {
     76     for (const object::RelocationRef &Reloc : SR.relocations()) {
     77       if (I == E)
     78         break;
     79       const object::symbol_iterator RelocSymI = Reloc.getSymbol();
     80       if (RelocSymI == Obj->symbol_end())
     81         continue;
     82       ErrorOr<StringRef> RelocSymName = RelocSymI->getName();
     83       error(RelocSymName.getError());
     84       uint64_t Offset = Reloc.getOffset();
     85       if (Offset >= SymOffset && Offset < SymEnd) {
     86         *I = *RelocSymName;
     87         ++I;
     88       }
     89     }
     90   }
     91 }
     92 
     93 static void collectRelocationOffsets(
     94     const ObjectFile *Obj, const SectionRef &Sec, uint64_t SecAddress,
     95     uint64_t SymAddress, uint64_t SymSize, StringRef SymName,
     96     std::map<std::pair<StringRef, uint64_t>, StringRef> &Collection) {
     97   uint64_t SymOffset = SymAddress - SecAddress;
     98   uint64_t SymEnd = SymOffset + SymSize;
     99   for (const SectionRef &SR : SectionRelocMap[Sec]) {
    100     for (const object::RelocationRef &Reloc : SR.relocations()) {
    101       const object::symbol_iterator RelocSymI = Reloc.getSymbol();
    102       if (RelocSymI == Obj->symbol_end())
    103         continue;
    104       ErrorOr<StringRef> RelocSymName = RelocSymI->getName();
    105       error(RelocSymName.getError());
    106       uint64_t Offset = Reloc.getOffset();
    107       if (Offset >= SymOffset && Offset < SymEnd)
    108         Collection[std::make_pair(SymName, Offset - SymOffset)] = *RelocSymName;
    109     }
    110   }
    111 }
    112 
    113 static void dumpCXXData(const ObjectFile *Obj) {
    114   struct CompleteObjectLocator {
    115     StringRef Symbols[2];
    116     ArrayRef<little32_t> Data;
    117   };
    118   struct ClassHierarchyDescriptor {
    119     StringRef Symbols[1];
    120     ArrayRef<little32_t> Data;
    121   };
    122   struct BaseClassDescriptor {
    123     StringRef Symbols[2];
    124     ArrayRef<little32_t> Data;
    125   };
    126   struct TypeDescriptor {
    127     StringRef Symbols[1];
    128     uint64_t AlwaysZero;
    129     StringRef MangledName;
    130   };
    131   struct ThrowInfo {
    132     uint32_t Flags;
    133   };
    134   struct CatchableTypeArray {
    135     uint32_t NumEntries;
    136   };
    137   struct CatchableType {
    138     uint32_t Flags;
    139     uint32_t NonVirtualBaseAdjustmentOffset;
    140     int32_t VirtualBasePointerOffset;
    141     uint32_t VirtualBaseAdjustmentOffset;
    142     uint32_t Size;
    143     StringRef Symbols[2];
    144   };
    145   std::map<std::pair<StringRef, uint64_t>, StringRef> VFTableEntries;
    146   std::map<std::pair<StringRef, uint64_t>, StringRef> TIEntries;
    147   std::map<std::pair<StringRef, uint64_t>, StringRef> CTAEntries;
    148   std::map<StringRef, ArrayRef<little32_t>> VBTables;
    149   std::map<StringRef, CompleteObjectLocator> COLs;
    150   std::map<StringRef, ClassHierarchyDescriptor> CHDs;
    151   std::map<std::pair<StringRef, uint64_t>, StringRef> BCAEntries;
    152   std::map<StringRef, BaseClassDescriptor> BCDs;
    153   std::map<StringRef, TypeDescriptor> TDs;
    154   std::map<StringRef, ThrowInfo> TIs;
    155   std::map<StringRef, CatchableTypeArray> CTAs;
    156   std::map<StringRef, CatchableType> CTs;
    157 
    158   std::map<std::pair<StringRef, uint64_t>, StringRef> VTableSymEntries;
    159   std::map<std::pair<StringRef, uint64_t>, int64_t> VTableDataEntries;
    160   std::map<std::pair<StringRef, uint64_t>, StringRef> VTTEntries;
    161   std::map<StringRef, StringRef> TINames;
    162 
    163   SectionRelocMap.clear();
    164   for (const SectionRef &Section : Obj->sections()) {
    165     section_iterator Sec2 = Section.getRelocatedSection();
    166     if (Sec2 != Obj->section_end())
    167       SectionRelocMap[*Sec2].push_back(Section);
    168   }
    169 
    170   uint8_t BytesInAddress = Obj->getBytesInAddress();
    171 
    172   std::vector<std::pair<SymbolRef, uint64_t>> SymAddr =
    173       object::computeSymbolSizes(*Obj);
    174 
    175   for (auto &P : SymAddr) {
    176     object::SymbolRef Sym = P.first;
    177     uint64_t SymSize = P.second;
    178     ErrorOr<StringRef> SymNameOrErr = Sym.getName();
    179     error(SymNameOrErr.getError());
    180     StringRef SymName = *SymNameOrErr;
    181     ErrorOr<object::section_iterator> SecIOrErr = Sym.getSection();
    182     error(SecIOrErr.getError());
    183     object::section_iterator SecI = *SecIOrErr;
    184     // Skip external symbols.
    185     if (SecI == Obj->section_end())
    186       continue;
    187     const SectionRef &Sec = *SecI;
    188     // Skip virtual or BSS sections.
    189     if (Sec.isBSS() || Sec.isVirtual())
    190       continue;
    191     StringRef SecContents;
    192     error(Sec.getContents(SecContents));
    193     ErrorOr<uint64_t> SymAddressOrErr = Sym.getAddress();
    194     error(SymAddressOrErr.getError());
    195     uint64_t SymAddress = *SymAddressOrErr;
    196     uint64_t SecAddress = Sec.getAddress();
    197     uint64_t SecSize = Sec.getSize();
    198     uint64_t SymOffset = SymAddress - SecAddress;
    199     StringRef SymContents = SecContents.substr(SymOffset, SymSize);
    200 
    201     // VFTables in the MS-ABI start with '??_7' and are contained within their
    202     // own COMDAT section.  We then determine the contents of the VFTable by
    203     // looking at each relocation in the section.
    204     if (SymName.startswith("??_7")) {
    205       // Each relocation either names a virtual method or a thunk.  We note the
    206       // offset into the section and the symbol used for the relocation.
    207       collectRelocationOffsets(Obj, Sec, SecAddress, SecAddress, SecSize,
    208                                SymName, VFTableEntries);
    209     }
    210     // VBTables in the MS-ABI start with '??_8' and are filled with 32-bit
    211     // offsets of virtual bases.
    212     else if (SymName.startswith("??_8")) {
    213       ArrayRef<little32_t> VBTableData(
    214           reinterpret_cast<const little32_t *>(SymContents.data()),
    215           SymContents.size() / sizeof(little32_t));
    216       VBTables[SymName] = VBTableData;
    217     }
    218     // Complete object locators in the MS-ABI start with '??_R4'
    219     else if (SymName.startswith("??_R4")) {
    220       CompleteObjectLocator COL;
    221       COL.Data = makeArrayRef(
    222           reinterpret_cast<const little32_t *>(SymContents.data()), 3);
    223       StringRef *I = std::begin(COL.Symbols), *E = std::end(COL.Symbols);
    224       collectRelocatedSymbols(Obj, Sec, SecAddress, SymAddress, SymSize, I, E);
    225       COLs[SymName] = COL;
    226     }
    227     // Class hierarchy descriptors in the MS-ABI start with '??_R3'
    228     else if (SymName.startswith("??_R3")) {
    229       ClassHierarchyDescriptor CHD;
    230       CHD.Data = makeArrayRef(
    231           reinterpret_cast<const little32_t *>(SymContents.data()), 3);
    232       StringRef *I = std::begin(CHD.Symbols), *E = std::end(CHD.Symbols);
    233       collectRelocatedSymbols(Obj, Sec, SecAddress, SymAddress, SymSize, I, E);
    234       CHDs[SymName] = CHD;
    235     }
    236     // Class hierarchy descriptors in the MS-ABI start with '??_R2'
    237     else if (SymName.startswith("??_R2")) {
    238       // Each relocation names a base class descriptor.  We note the offset into
    239       // the section and the symbol used for the relocation.
    240       collectRelocationOffsets(Obj, Sec, SecAddress, SymAddress, SymSize,
    241                                SymName, BCAEntries);
    242     }
    243     // Base class descriptors in the MS-ABI start with '??_R1'
    244     else if (SymName.startswith("??_R1")) {
    245       BaseClassDescriptor BCD;
    246       BCD.Data = makeArrayRef(
    247           reinterpret_cast<const little32_t *>(SymContents.data()) + 1, 5);
    248       StringRef *I = std::begin(BCD.Symbols), *E = std::end(BCD.Symbols);
    249       collectRelocatedSymbols(Obj, Sec, SecAddress, SymAddress, SymSize, I, E);
    250       BCDs[SymName] = BCD;
    251     }
    252     // Type descriptors in the MS-ABI start with '??_R0'
    253     else if (SymName.startswith("??_R0")) {
    254       const char *DataPtr = SymContents.drop_front(BytesInAddress).data();
    255       TypeDescriptor TD;
    256       if (BytesInAddress == 8)
    257         TD.AlwaysZero = *reinterpret_cast<const little64_t *>(DataPtr);
    258       else
    259         TD.AlwaysZero = *reinterpret_cast<const little32_t *>(DataPtr);
    260       TD.MangledName = SymContents.drop_front(BytesInAddress * 2);
    261       StringRef *I = std::begin(TD.Symbols), *E = std::end(TD.Symbols);
    262       collectRelocatedSymbols(Obj, Sec, SecAddress, SymAddress, SymSize, I, E);
    263       TDs[SymName] = TD;
    264     }
    265     // Throw descriptors in the MS-ABI start with '_TI'
    266     else if (SymName.startswith("_TI") || SymName.startswith("__TI")) {
    267       ThrowInfo TI;
    268       TI.Flags = *reinterpret_cast<const little32_t *>(SymContents.data());
    269       collectRelocationOffsets(Obj, Sec, SecAddress, SymAddress, SymSize,
    270                                SymName, TIEntries);
    271       TIs[SymName] = TI;
    272     }
    273     // Catchable type arrays in the MS-ABI start with _CTA or __CTA.
    274     else if (SymName.startswith("_CTA") || SymName.startswith("__CTA")) {
    275       CatchableTypeArray CTA;
    276       CTA.NumEntries =
    277           *reinterpret_cast<const little32_t *>(SymContents.data());
    278       collectRelocationOffsets(Obj, Sec, SecAddress, SymAddress, SymSize,
    279                                SymName, CTAEntries);
    280       CTAs[SymName] = CTA;
    281     }
    282     // Catchable types in the MS-ABI start with _CT or __CT.
    283     else if (SymName.startswith("_CT") || SymName.startswith("__CT")) {
    284       const little32_t *DataPtr =
    285           reinterpret_cast<const little32_t *>(SymContents.data());
    286       CatchableType CT;
    287       CT.Flags = DataPtr[0];
    288       CT.NonVirtualBaseAdjustmentOffset = DataPtr[2];
    289       CT.VirtualBasePointerOffset = DataPtr[3];
    290       CT.VirtualBaseAdjustmentOffset = DataPtr[4];
    291       CT.Size = DataPtr[5];
    292       StringRef *I = std::begin(CT.Symbols), *E = std::end(CT.Symbols);
    293       collectRelocatedSymbols(Obj, Sec, SecAddress, SymAddress, SymSize, I, E);
    294       CTs[SymName] = CT;
    295     }
    296     // Construction vtables in the Itanium ABI start with '_ZTT' or '__ZTT'.
    297     else if (SymName.startswith("_ZTT") || SymName.startswith("__ZTT")) {
    298       collectRelocationOffsets(Obj, Sec, SecAddress, SymAddress, SymSize,
    299                                SymName, VTTEntries);
    300     }
    301     // Typeinfo names in the Itanium ABI start with '_ZTS' or '__ZTS'.
    302     else if (SymName.startswith("_ZTS") || SymName.startswith("__ZTS")) {
    303       TINames[SymName] = SymContents.slice(0, SymContents.find('\0'));
    304     }
    305     // Vtables in the Itanium ABI start with '_ZTV' or '__ZTV'.
    306     else if (SymName.startswith("_ZTV") || SymName.startswith("__ZTV")) {
    307       collectRelocationOffsets(Obj, Sec, SecAddress, SymAddress, SymSize,
    308                                SymName, VTableSymEntries);
    309       for (uint64_t SymOffI = 0; SymOffI < SymSize; SymOffI += BytesInAddress) {
    310         auto Key = std::make_pair(SymName, SymOffI);
    311         if (VTableSymEntries.count(Key))
    312           continue;
    313         const char *DataPtr =
    314             SymContents.substr(SymOffI, BytesInAddress).data();
    315         int64_t VData;
    316         if (BytesInAddress == 8)
    317           VData = *reinterpret_cast<const little64_t *>(DataPtr);
    318         else
    319           VData = *reinterpret_cast<const little32_t *>(DataPtr);
    320         VTableDataEntries[Key] = VData;
    321       }
    322     }
    323     // Typeinfo structures in the Itanium ABI start with '_ZTI' or '__ZTI'.
    324     else if (SymName.startswith("_ZTI") || SymName.startswith("__ZTI")) {
    325       // FIXME: Do something with these!
    326     }
    327   }
    328   for (const auto &VFTableEntry : VFTableEntries) {
    329     StringRef VFTableName = VFTableEntry.first.first;
    330     uint64_t Offset = VFTableEntry.first.second;
    331     StringRef SymName = VFTableEntry.second;
    332     outs() << VFTableName << '[' << Offset << "]: " << SymName << '\n';
    333   }
    334   for (const auto &VBTable : VBTables) {
    335     StringRef VBTableName = VBTable.first;
    336     uint32_t Idx = 0;
    337     for (little32_t Offset : VBTable.second) {
    338       outs() << VBTableName << '[' << Idx << "]: " << Offset << '\n';
    339       Idx += sizeof(Offset);
    340     }
    341   }
    342   for (const auto &COLPair : COLs) {
    343     StringRef COLName = COLPair.first;
    344     const CompleteObjectLocator &COL = COLPair.second;
    345     outs() << COLName << "[IsImageRelative]: " << COL.Data[0] << '\n';
    346     outs() << COLName << "[OffsetToTop]: " << COL.Data[1] << '\n';
    347     outs() << COLName << "[VFPtrOffset]: " << COL.Data[2] << '\n';
    348     outs() << COLName << "[TypeDescriptor]: " << COL.Symbols[0] << '\n';
    349     outs() << COLName << "[ClassHierarchyDescriptor]: " << COL.Symbols[1]
    350            << '\n';
    351   }
    352   for (const auto &CHDPair : CHDs) {
    353     StringRef CHDName = CHDPair.first;
    354     const ClassHierarchyDescriptor &CHD = CHDPair.second;
    355     outs() << CHDName << "[AlwaysZero]: " << CHD.Data[0] << '\n';
    356     outs() << CHDName << "[Flags]: " << CHD.Data[1] << '\n';
    357     outs() << CHDName << "[NumClasses]: " << CHD.Data[2] << '\n';
    358     outs() << CHDName << "[BaseClassArray]: " << CHD.Symbols[0] << '\n';
    359   }
    360   for (const auto &BCAEntry : BCAEntries) {
    361     StringRef BCAName = BCAEntry.first.first;
    362     uint64_t Offset = BCAEntry.first.second;
    363     StringRef SymName = BCAEntry.second;
    364     outs() << BCAName << '[' << Offset << "]: " << SymName << '\n';
    365   }
    366   for (const auto &BCDPair : BCDs) {
    367     StringRef BCDName = BCDPair.first;
    368     const BaseClassDescriptor &BCD = BCDPair.second;
    369     outs() << BCDName << "[TypeDescriptor]: " << BCD.Symbols[0] << '\n';
    370     outs() << BCDName << "[NumBases]: " << BCD.Data[0] << '\n';
    371     outs() << BCDName << "[OffsetInVBase]: " << BCD.Data[1] << '\n';
    372     outs() << BCDName << "[VBPtrOffset]: " << BCD.Data[2] << '\n';
    373     outs() << BCDName << "[OffsetInVBTable]: " << BCD.Data[3] << '\n';
    374     outs() << BCDName << "[Flags]: " << BCD.Data[4] << '\n';
    375     outs() << BCDName << "[ClassHierarchyDescriptor]: " << BCD.Symbols[1]
    376            << '\n';
    377   }
    378   for (const auto &TDPair : TDs) {
    379     StringRef TDName = TDPair.first;
    380     const TypeDescriptor &TD = TDPair.second;
    381     outs() << TDName << "[VFPtr]: " << TD.Symbols[0] << '\n';
    382     outs() << TDName << "[AlwaysZero]: " << TD.AlwaysZero << '\n';
    383     outs() << TDName << "[MangledName]: ";
    384     outs().write_escaped(TD.MangledName.rtrim(StringRef("\0", 1)),
    385                          /*UseHexEscapes=*/true)
    386         << '\n';
    387   }
    388   for (const auto &TIPair : TIs) {
    389     StringRef TIName = TIPair.first;
    390     const ThrowInfo &TI = TIPair.second;
    391     auto dumpThrowInfoFlag = [&](const char *Name, uint32_t Flag) {
    392       outs() << TIName << "[Flags." << Name
    393              << "]: " << (TI.Flags & Flag ? "true" : "false") << '\n';
    394     };
    395     auto dumpThrowInfoSymbol = [&](const char *Name, int Offset) {
    396       outs() << TIName << '[' << Name << "]: ";
    397       auto Entry = TIEntries.find(std::make_pair(TIName, Offset));
    398       outs() << (Entry == TIEntries.end() ? "null" : Entry->second) << '\n';
    399     };
    400     outs() << TIName << "[Flags]: " << TI.Flags << '\n';
    401     dumpThrowInfoFlag("Const", 1);
    402     dumpThrowInfoFlag("Volatile", 2);
    403     dumpThrowInfoSymbol("CleanupFn", 4);
    404     dumpThrowInfoSymbol("ForwardCompat", 8);
    405     dumpThrowInfoSymbol("CatchableTypeArray", 12);
    406   }
    407   for (const auto &CTAPair : CTAs) {
    408     StringRef CTAName = CTAPair.first;
    409     const CatchableTypeArray &CTA = CTAPair.second;
    410 
    411     outs() << CTAName << "[NumEntries]: " << CTA.NumEntries << '\n';
    412 
    413     unsigned Idx = 0;
    414     for (auto I = CTAEntries.lower_bound(std::make_pair(CTAName, 0)),
    415               E = CTAEntries.upper_bound(std::make_pair(CTAName, UINT64_MAX));
    416          I != E; ++I)
    417       outs() << CTAName << '[' << Idx++ << "]: " << I->second << '\n';
    418   }
    419   for (const auto &CTPair : CTs) {
    420     StringRef CTName = CTPair.first;
    421     const CatchableType &CT = CTPair.second;
    422     auto dumpCatchableTypeFlag = [&](const char *Name, uint32_t Flag) {
    423       outs() << CTName << "[Flags." << Name
    424              << "]: " << (CT.Flags & Flag ? "true" : "false") << '\n';
    425     };
    426     outs() << CTName << "[Flags]: " << CT.Flags << '\n';
    427     dumpCatchableTypeFlag("ScalarType", 1);
    428     dumpCatchableTypeFlag("VirtualInheritance", 4);
    429     outs() << CTName << "[TypeDescriptor]: " << CT.Symbols[0] << '\n';
    430     outs() << CTName << "[NonVirtualBaseAdjustmentOffset]: "
    431            << CT.NonVirtualBaseAdjustmentOffset << '\n';
    432     outs() << CTName
    433            << "[VirtualBasePointerOffset]: " << CT.VirtualBasePointerOffset
    434            << '\n';
    435     outs() << CTName << "[VirtualBaseAdjustmentOffset]: "
    436            << CT.VirtualBaseAdjustmentOffset << '\n';
    437     outs() << CTName << "[Size]: " << CT.Size << '\n';
    438     outs() << CTName
    439            << "[CopyCtor]: " << (CT.Symbols[1].empty() ? "null" : CT.Symbols[1])
    440            << '\n';
    441   }
    442   for (const auto &VTTPair : VTTEntries) {
    443     StringRef VTTName = VTTPair.first.first;
    444     uint64_t VTTOffset = VTTPair.first.second;
    445     StringRef VTTEntry = VTTPair.second;
    446     outs() << VTTName << '[' << VTTOffset << "]: " << VTTEntry << '\n';
    447   }
    448   for (const auto &TIPair : TINames) {
    449     StringRef TIName = TIPair.first;
    450     outs() << TIName << ": " << TIPair.second << '\n';
    451   }
    452   auto VTableSymI = VTableSymEntries.begin();
    453   auto VTableSymE = VTableSymEntries.end();
    454   auto VTableDataI = VTableDataEntries.begin();
    455   auto VTableDataE = VTableDataEntries.end();
    456   for (;;) {
    457     bool SymDone = VTableSymI == VTableSymE;
    458     bool DataDone = VTableDataI == VTableDataE;
    459     if (SymDone && DataDone)
    460       break;
    461     if (!SymDone && (DataDone || VTableSymI->first < VTableDataI->first)) {
    462       StringRef VTableName = VTableSymI->first.first;
    463       uint64_t Offset = VTableSymI->first.second;
    464       StringRef VTableEntry = VTableSymI->second;
    465       outs() << VTableName << '[' << Offset << "]: ";
    466       outs() << VTableEntry;
    467       outs() << '\n';
    468       ++VTableSymI;
    469       continue;
    470     }
    471     if (!DataDone && (SymDone || VTableDataI->first < VTableSymI->first)) {
    472       StringRef VTableName = VTableDataI->first.first;
    473       uint64_t Offset = VTableDataI->first.second;
    474       int64_t VTableEntry = VTableDataI->second;
    475       outs() << VTableName << '[' << Offset << "]: ";
    476       outs() << VTableEntry;
    477       outs() << '\n';
    478       ++VTableDataI;
    479       continue;
    480     }
    481   }
    482 }
    483 
    484 static void dumpArchive(const Archive *Arc) {
    485   for (auto &ErrorOrChild : Arc->children()) {
    486     error(ErrorOrChild.getError());
    487     const Archive::Child &ArcC = *ErrorOrChild;
    488     ErrorOr<std::unique_ptr<Binary>> ChildOrErr = ArcC.getAsBinary();
    489     if (std::error_code EC = ChildOrErr.getError()) {
    490       // Ignore non-object files.
    491       if (EC != object_error::invalid_file_type)
    492         reportError(Arc->getFileName(), EC.message());
    493       continue;
    494     }
    495 
    496     if (ObjectFile *Obj = dyn_cast<ObjectFile>(&*ChildOrErr.get()))
    497       dumpCXXData(Obj);
    498     else
    499       reportError(Arc->getFileName(), cxxdump_error::unrecognized_file_format);
    500   }
    501 }
    502 
    503 static void dumpInput(StringRef File) {
    504   // Attempt to open the binary.
    505   ErrorOr<OwningBinary<Binary>> BinaryOrErr = createBinary(File);
    506   if (std::error_code EC = BinaryOrErr.getError()) {
    507     reportError(File, EC);
    508     return;
    509   }
    510   Binary &Binary = *BinaryOrErr.get().getBinary();
    511 
    512   if (Archive *Arc = dyn_cast<Archive>(&Binary))
    513     dumpArchive(Arc);
    514   else if (ObjectFile *Obj = dyn_cast<ObjectFile>(&Binary))
    515     dumpCXXData(Obj);
    516   else
    517     reportError(File, cxxdump_error::unrecognized_file_format);
    518 }
    519 
    520 int main(int argc, const char *argv[]) {
    521   sys::PrintStackTraceOnErrorSignal();
    522   PrettyStackTraceProgram X(argc, argv);
    523   llvm_shutdown_obj Y;
    524 
    525   // Initialize targets.
    526   llvm::InitializeAllTargetInfos();
    527 
    528   // Register the target printer for --version.
    529   cl::AddExtraVersionPrinter(TargetRegistry::printRegisteredTargetsForVersion);
    530 
    531   cl::ParseCommandLineOptions(argc, argv, "LLVM C++ ABI Data Dumper\n");
    532 
    533   // Default to stdin if no filename is specified.
    534   if (opts::InputFilenames.size() == 0)
    535     opts::InputFilenames.push_back("-");
    536 
    537   std::for_each(opts::InputFilenames.begin(), opts::InputFilenames.end(),
    538                 dumpInput);
    539 
    540   return EXIT_SUCCESS;
    541 }
    542