Home | History | Annotate | Download | only in llvm-objdump 
      1 //===-- llvm-objdump.cpp - Object file dumping utility for llvm -----------===//
      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 // This program is a utility that works like binutils "objdump", that is, it
     11 // dumps out a plethora of information about an object file depending on the
     12 // flags.
     13 //
     14 //===----------------------------------------------------------------------===//
     15 
     16 #include "llvm-objdump.h"
     17 #include "MCFunction.h"
     18 #include "llvm/Object/Archive.h"
     19 #include "llvm/Object/COFF.h"
     20 #include "llvm/Object/ObjectFile.h"
     21 #include "llvm/ADT/OwningPtr.h"
     22 #include "llvm/ADT/StringExtras.h"
     23 #include "llvm/ADT/Triple.h"
     24 #include "llvm/ADT/STLExtras.h"
     25 #include "llvm/MC/MCAsmInfo.h"
     26 #include "llvm/MC/MCDisassembler.h"
     27 #include "llvm/MC/MCInst.h"
     28 #include "llvm/MC/MCInstPrinter.h"
     29 #include "llvm/MC/MCInstrInfo.h"
     30 #include "llvm/MC/MCRegisterInfo.h"
     31 #include "llvm/MC/MCSubtargetInfo.h"
     32 #include "llvm/Support/Casting.h"
     33 #include "llvm/Support/CommandLine.h"
     34 #include "llvm/Support/Debug.h"
     35 #include "llvm/Support/FileSystem.h"
     36 #include "llvm/Support/Format.h"
     37 #include "llvm/Support/GraphWriter.h"
     38 #include "llvm/Support/Host.h"
     39 #include "llvm/Support/ManagedStatic.h"
     40 #include "llvm/Support/MemoryBuffer.h"
     41 #include "llvm/Support/MemoryObject.h"
     42 #include "llvm/Support/PrettyStackTrace.h"
     43 #include "llvm/Support/Signals.h"
     44 #include "llvm/Support/SourceMgr.h"
     45 #include "llvm/Support/TargetRegistry.h"
     46 #include "llvm/Support/TargetSelect.h"
     47 #include "llvm/Support/raw_ostream.h"
     48 #include "llvm/Support/system_error.h"
     49 #include <algorithm>
     50 #include <cctype>
     51 #include <cstring>
     52 using namespace llvm;
     53 using namespace object;
     54 
     55 static cl::list<std::string>
     56 InputFilenames(cl::Positional, cl::desc("<input object files>"),cl::ZeroOrMore);
     57 
     58 static cl::opt<bool>
     59 Disassemble("disassemble",
     60   cl::desc("Display assembler mnemonics for the machine instructions"));
     61 static cl::alias
     62 Disassembled("d", cl::desc("Alias for --disassemble"),
     63              cl::aliasopt(Disassemble));
     64 
     65 static cl::opt<bool>
     66 Relocations("r", cl::desc("Display the relocation entries in the file"));
     67 
     68 static cl::opt<bool>
     69 SectionContents("s", cl::desc("Display the content of each section"));
     70 
     71 static cl::opt<bool>
     72 SymbolTable("t", cl::desc("Display the symbol table"));
     73 
     74 static cl::opt<bool>
     75 MachO("macho", cl::desc("Use MachO specific object file parser"));
     76 static cl::alias
     77 MachOm("m", cl::desc("Alias for --macho"), cl::aliasopt(MachO));
     78 
     79 cl::opt<std::string>
     80 llvm::TripleName("triple", cl::desc("Target triple to disassemble for, "
     81                                     "see -version for available targets"));
     82 
     83 cl::opt<std::string>
     84 llvm::ArchName("arch", cl::desc("Target arch to disassemble for, "
     85                                 "see -version for available targets"));
     86 
     87 static cl::opt<bool>
     88 SectionHeaders("section-headers", cl::desc("Display summaries of the headers "
     89                                            "for each section."));
     90 static cl::alias
     91 SectionHeadersShort("headers", cl::desc("Alias for --section-headers"),
     92                     cl::aliasopt(SectionHeaders));
     93 static cl::alias
     94 SectionHeadersShorter("h", cl::desc("Alias for --section-headers"),
     95                       cl::aliasopt(SectionHeaders));
     96 
     97 static cl::list<std::string>
     98 MAttrs("mattr",
     99   cl::CommaSeparated,
    100   cl::desc("Target specific attributes"),
    101   cl::value_desc("a1,+a2,-a3,..."));
    102 
    103 static StringRef ToolName;
    104 
    105 static bool error(error_code ec) {
    106   if (!ec) return false;
    107 
    108   outs() << ToolName << ": error reading file: " << ec.message() << ".\n";
    109   outs().flush();
    110   return true;
    111 }
    112 
    113 static const Target *getTarget(const ObjectFile *Obj = NULL) {
    114   // Figure out the target triple.
    115   llvm::Triple TheTriple("unknown-unknown-unknown");
    116   if (TripleName.empty()) {
    117     if (Obj)
    118       TheTriple.setArch(Triple::ArchType(Obj->getArch()));
    119   } else
    120     TheTriple.setTriple(Triple::normalize(TripleName));
    121 
    122   // Get the target specific parser.
    123   std::string Error;
    124   const Target *TheTarget = TargetRegistry::lookupTarget(ArchName, TheTriple,
    125                                                          Error);
    126   if (!TheTarget) {
    127     errs() << ToolName << ": " << Error;
    128     return 0;
    129   }
    130 
    131   // Update the triple name and return the found target.
    132   TripleName = TheTriple.getTriple();
    133   return TheTarget;
    134 }
    135 
    136 void llvm::StringRefMemoryObject::anchor() { }
    137 
    138 void llvm::DumpBytes(StringRef bytes) {
    139   static const char hex_rep[] = "0123456789abcdef";
    140   // FIXME: The real way to do this is to figure out the longest instruction
    141   //        and align to that size before printing. I'll fix this when I get
    142   //        around to outputting relocations.
    143   // 15 is the longest x86 instruction
    144   // 3 is for the hex rep of a byte + a space.
    145   // 1 is for the null terminator.
    146   enum { OutputSize = (15 * 3) + 1 };
    147   char output[OutputSize];
    148 
    149   assert(bytes.size() <= 15
    150     && "DumpBytes only supports instructions of up to 15 bytes");
    151   memset(output, ' ', sizeof(output));
    152   unsigned index = 0;
    153   for (StringRef::iterator i = bytes.begin(),
    154                            e = bytes.end(); i != e; ++i) {
    155     output[index] = hex_rep[(*i & 0xF0) >> 4];
    156     output[index + 1] = hex_rep[*i & 0xF];
    157     index += 3;
    158   }
    159 
    160   output[sizeof(output) - 1] = 0;
    161   outs() << output;
    162 }
    163 
    164 static bool RelocAddressLess(RelocationRef a, RelocationRef b) {
    165   uint64_t a_addr, b_addr;
    166   if (error(a.getAddress(a_addr))) return false;
    167   if (error(b.getAddress(b_addr))) return false;
    168   return a_addr < b_addr;
    169 }
    170 
    171 static void DisassembleObject(const ObjectFile *Obj, bool InlineRelocs) {
    172   const Target *TheTarget = getTarget(Obj);
    173   // getTarget() will have already issued a diagnostic if necessary, so
    174   // just bail here if it failed.
    175   if (!TheTarget)
    176     return;
    177 
    178   // Package up features to be passed to target/subtarget
    179   std::string FeaturesStr;
    180   if (MAttrs.size()) {
    181     SubtargetFeatures Features;
    182     for (unsigned i = 0; i != MAttrs.size(); ++i)
    183       Features.AddFeature(MAttrs[i]);
    184     FeaturesStr = Features.getString();
    185   }
    186 
    187   error_code ec;
    188   for (section_iterator i = Obj->begin_sections(),
    189                         e = Obj->end_sections();
    190                         i != e; i.increment(ec)) {
    191     if (error(ec)) break;
    192     bool text;
    193     if (error(i->isText(text))) break;
    194     if (!text) continue;
    195 
    196     uint64_t SectionAddr;
    197     if (error(i->getAddress(SectionAddr))) break;
    198 
    199     // Make a list of all the symbols in this section.
    200     std::vector<std::pair<uint64_t, StringRef> > Symbols;
    201     for (symbol_iterator si = Obj->begin_symbols(),
    202                          se = Obj->end_symbols();
    203                          si != se; si.increment(ec)) {
    204       bool contains;
    205       if (!error(i->containsSymbol(*si, contains)) && contains) {
    206         uint64_t Address;
    207         if (error(si->getAddress(Address))) break;
    208         Address -= SectionAddr;
    209 
    210         StringRef Name;
    211         if (error(si->getName(Name))) break;
    212         Symbols.push_back(std::make_pair(Address, Name));
    213       }
    214     }
    215 
    216     // Sort the symbols by address, just in case they didn't come in that way.
    217     array_pod_sort(Symbols.begin(), Symbols.end());
    218 
    219     // Make a list of all the relocations for this section.
    220     std::vector<RelocationRef> Rels;
    221     if (InlineRelocs) {
    222       for (relocation_iterator ri = i->begin_relocations(),
    223                                re = i->end_relocations();
    224                                ri != re; ri.increment(ec)) {
    225         if (error(ec)) break;
    226         Rels.push_back(*ri);
    227       }
    228     }
    229 
    230     // Sort relocations by address.
    231     std::sort(Rels.begin(), Rels.end(), RelocAddressLess);
    232 
    233     StringRef name;
    234     if (error(i->getName(name))) break;
    235     outs() << "Disassembly of section " << name << ':';
    236 
    237     // If the section has no symbols just insert a dummy one and disassemble
    238     // the whole section.
    239     if (Symbols.empty())
    240       Symbols.push_back(std::make_pair(0, name));
    241 
    242     // Set up disassembler.
    243     OwningPtr<const MCAsmInfo> AsmInfo(TheTarget->createMCAsmInfo(TripleName));
    244 
    245     if (!AsmInfo) {
    246       errs() << "error: no assembly info for target " << TripleName << "\n";
    247       return;
    248     }
    249 
    250     OwningPtr<const MCSubtargetInfo> STI(
    251       TheTarget->createMCSubtargetInfo(TripleName, "", FeaturesStr));
    252 
    253     if (!STI) {
    254       errs() << "error: no subtarget info for target " << TripleName << "\n";
    255       return;
    256     }
    257 
    258     OwningPtr<const MCDisassembler> DisAsm(
    259       TheTarget->createMCDisassembler(*STI));
    260     if (!DisAsm) {
    261       errs() << "error: no disassembler for target " << TripleName << "\n";
    262       return;
    263     }
    264 
    265     OwningPtr<const MCRegisterInfo> MRI(TheTarget->createMCRegInfo(TripleName));
    266     if (!MRI) {
    267       errs() << "error: no register info for target " << TripleName << "\n";
    268       return;
    269     }
    270 
    271     OwningPtr<const MCInstrInfo> MII(TheTarget->createMCInstrInfo());
    272     if (!MII) {
    273       errs() << "error: no instruction info for target " << TripleName << "\n";
    274       return;
    275     }
    276 
    277     int AsmPrinterVariant = AsmInfo->getAssemblerDialect();
    278     OwningPtr<MCInstPrinter> IP(TheTarget->createMCInstPrinter(
    279                                 AsmPrinterVariant, *AsmInfo, *MII, *MRI, *STI));
    280     if (!IP) {
    281       errs() << "error: no instruction printer for target " << TripleName
    282              << '\n';
    283       return;
    284     }
    285 
    286     StringRef Bytes;
    287     if (error(i->getContents(Bytes))) break;
    288     StringRefMemoryObject memoryObject(Bytes);
    289     uint64_t Size;
    290     uint64_t Index;
    291     uint64_t SectSize;
    292     if (error(i->getSize(SectSize))) break;
    293 
    294     std::vector<RelocationRef>::const_iterator rel_cur = Rels.begin();
    295     std::vector<RelocationRef>::const_iterator rel_end = Rels.end();
    296     // Disassemble symbol by symbol.
    297     for (unsigned si = 0, se = Symbols.size(); si != se; ++si) {
    298       uint64_t Start = Symbols[si].first;
    299       uint64_t End;
    300       // The end is either the size of the section or the beginning of the next
    301       // symbol.
    302       if (si == se - 1)
    303         End = SectSize;
    304       // Make sure this symbol takes up space.
    305       else if (Symbols[si + 1].first != Start)
    306         End = Symbols[si + 1].first - 1;
    307       else
    308         // This symbol has the same address as the next symbol. Skip it.
    309         continue;
    310 
    311       outs() << '\n' << Symbols[si].second << ":\n";
    312 
    313 #ifndef NDEBUG
    314         raw_ostream &DebugOut = DebugFlag ? dbgs() : nulls();
    315 #else
    316         raw_ostream &DebugOut = nulls();
    317 #endif
    318 
    319       for (Index = Start; Index < End; Index += Size) {
    320         MCInst Inst;
    321 
    322         if (DisAsm->getInstruction(Inst, Size, memoryObject, Index,
    323                                    DebugOut, nulls())) {
    324           outs() << format("%8" PRIx64 ":\t", SectionAddr + Index);
    325           DumpBytes(StringRef(Bytes.data() + Index, Size));
    326           IP->printInst(&Inst, outs(), "");
    327           outs() << "\n";
    328         } else {
    329           errs() << ToolName << ": warning: invalid instruction encoding\n";
    330           if (Size == 0)
    331             Size = 1; // skip illegible bytes
    332         }
    333 
    334         // Print relocation for instruction.
    335         while (rel_cur != rel_end) {
    336           bool hidden = false;
    337           uint64_t addr;
    338           SmallString<16> name;
    339           SmallString<32> val;
    340 
    341           // If this relocation is hidden, skip it.
    342           if (error(rel_cur->getHidden(hidden))) goto skip_print_rel;
    343           if (hidden) goto skip_print_rel;
    344 
    345           if (error(rel_cur->getAddress(addr))) goto skip_print_rel;
    346           // Stop when rel_cur's address is past the current instruction.
    347           if (addr >= Index + Size) break;
    348           if (error(rel_cur->getTypeName(name))) goto skip_print_rel;
    349           if (error(rel_cur->getValueString(val))) goto skip_print_rel;
    350 
    351           outs() << format("\t\t\t%8" PRIx64 ": ", SectionAddr + addr) << name
    352                  << "\t" << val << "\n";
    353 
    354         skip_print_rel:
    355           ++rel_cur;
    356         }
    357       }
    358     }
    359   }
    360 }
    361 
    362 static void PrintRelocations(const ObjectFile *o) {
    363   error_code ec;
    364   for (section_iterator si = o->begin_sections(), se = o->end_sections();
    365                                                   si != se; si.increment(ec)){
    366     if (error(ec)) return;
    367     if (si->begin_relocations() == si->end_relocations())
    368       continue;
    369     StringRef secname;
    370     if (error(si->getName(secname))) continue;
    371     outs() << "RELOCATION RECORDS FOR [" << secname << "]:\n";
    372     for (relocation_iterator ri = si->begin_relocations(),
    373                              re = si->end_relocations();
    374                              ri != re; ri.increment(ec)) {
    375       if (error(ec)) return;
    376 
    377       bool hidden;
    378       uint64_t address;
    379       SmallString<32> relocname;
    380       SmallString<32> valuestr;
    381       if (error(ri->getHidden(hidden))) continue;
    382       if (hidden) continue;
    383       if (error(ri->getTypeName(relocname))) continue;
    384       if (error(ri->getAddress(address))) continue;
    385       if (error(ri->getValueString(valuestr))) continue;
    386       outs() << address << " " << relocname << " " << valuestr << "\n";
    387     }
    388     outs() << "\n";
    389   }
    390 }
    391 
    392 static void PrintSectionHeaders(const ObjectFile *o) {
    393   outs() << "Sections:\n"
    394             "Idx Name          Size      Address          Type\n";
    395   error_code ec;
    396   unsigned i = 0;
    397   for (section_iterator si = o->begin_sections(), se = o->end_sections();
    398                                                   si != se; si.increment(ec)) {
    399     if (error(ec)) return;
    400     StringRef Name;
    401     if (error(si->getName(Name))) return;
    402     uint64_t Address;
    403     if (error(si->getAddress(Address))) return;
    404     uint64_t Size;
    405     if (error(si->getSize(Size))) return;
    406     bool Text, Data, BSS;
    407     if (error(si->isText(Text))) return;
    408     if (error(si->isData(Data))) return;
    409     if (error(si->isBSS(BSS))) return;
    410     std::string Type = (std::string(Text ? "TEXT " : "") +
    411                         (Data ? "DATA " : "") + (BSS ? "BSS" : ""));
    412     outs() << format("%3d %-13s %09" PRIx64 " %017" PRIx64 " %s\n",
    413                      i, Name.str().c_str(), Size, Address, Type.c_str());
    414     ++i;
    415   }
    416 }
    417 
    418 static void PrintSectionContents(const ObjectFile *o) {
    419   error_code ec;
    420   for (section_iterator si = o->begin_sections(),
    421                         se = o->end_sections();
    422                         si != se; si.increment(ec)) {
    423     if (error(ec)) return;
    424     StringRef Name;
    425     StringRef Contents;
    426     uint64_t BaseAddr;
    427     if (error(si->getName(Name))) continue;
    428     if (error(si->getContents(Contents))) continue;
    429     if (error(si->getAddress(BaseAddr))) continue;
    430 
    431     outs() << "Contents of section " << Name << ":\n";
    432 
    433     // Dump out the content as hex and printable ascii characters.
    434     for (std::size_t addr = 0, end = Contents.size(); addr < end; addr += 16) {
    435       outs() << format(" %04" PRIx64 " ", BaseAddr + addr);
    436       // Dump line of hex.
    437       for (std::size_t i = 0; i < 16; ++i) {
    438         if (i != 0 && i % 4 == 0)
    439           outs() << ' ';
    440         if (addr + i < end)
    441           outs() << hexdigit((Contents[addr + i] >> 4) & 0xF, true)
    442                  << hexdigit(Contents[addr + i] & 0xF, true);
    443         else
    444           outs() << "  ";
    445       }
    446       // Print ascii.
    447       outs() << "  ";
    448       for (std::size_t i = 0; i < 16 && addr + i < end; ++i) {
    449         if (std::isprint(Contents[addr + i] & 0xFF))
    450           outs() << Contents[addr + i];
    451         else
    452           outs() << ".";
    453       }
    454       outs() << "\n";
    455     }
    456   }
    457 }
    458 
    459 static void PrintCOFFSymbolTable(const COFFObjectFile *coff) {
    460   const coff_file_header *header;
    461   if (error(coff->getHeader(header))) return;
    462   int aux_count = 0;
    463   const coff_symbol *symbol = 0;
    464   for (int i = 0, e = header->NumberOfSymbols; i != e; ++i) {
    465     if (aux_count--) {
    466       // Figure out which type of aux this is.
    467       if (symbol->StorageClass == COFF::IMAGE_SYM_CLASS_STATIC
    468           && symbol->Value == 0) { // Section definition.
    469         const coff_aux_section_definition *asd;
    470         if (error(coff->getAuxSymbol<coff_aux_section_definition>(i, asd)))
    471           return;
    472         outs() << "AUX "
    473                << format("scnlen 0x%x nreloc %d nlnno %d checksum 0x%x "
    474                          , unsigned(asd->Length)
    475                          , unsigned(asd->NumberOfRelocations)
    476                          , unsigned(asd->NumberOfLinenumbers)
    477                          , unsigned(asd->CheckSum))
    478                << format("assoc %d comdat %d\n"
    479                          , unsigned(asd->Number)
    480                          , unsigned(asd->Selection));
    481       } else
    482         outs() << "AUX Unknown\n";
    483     } else {
    484       StringRef name;
    485       if (error(coff->getSymbol(i, symbol))) return;
    486       if (error(coff->getSymbolName(symbol, name))) return;
    487       outs() << "[" << format("%2d", i) << "]"
    488              << "(sec " << format("%2d", int(symbol->SectionNumber)) << ")"
    489              << "(fl 0x00)" // Flag bits, which COFF doesn't have.
    490              << "(ty " << format("%3x", unsigned(symbol->Type)) << ")"
    491              << "(scl " << format("%3x", unsigned(symbol->StorageClass)) << ") "
    492              << "(nx " << unsigned(symbol->NumberOfAuxSymbols) << ") "
    493              << "0x" << format("%08x", unsigned(symbol->Value)) << " "
    494              << name << "\n";
    495       aux_count = symbol->NumberOfAuxSymbols;
    496     }
    497   }
    498 }
    499 
    500 static void PrintSymbolTable(const ObjectFile *o) {
    501   outs() << "SYMBOL TABLE:\n";
    502 
    503   if (const COFFObjectFile *coff = dyn_cast<const COFFObjectFile>(o))
    504     PrintCOFFSymbolTable(coff);
    505   else {
    506     error_code ec;
    507     for (symbol_iterator si = o->begin_symbols(),
    508                          se = o->end_symbols(); si != se; si.increment(ec)) {
    509       if (error(ec)) return;
    510       StringRef Name;
    511       uint64_t Address;
    512       SymbolRef::Type Type;
    513       uint64_t Size;
    514       uint32_t Flags;
    515       section_iterator Section = o->end_sections();
    516       if (error(si->getName(Name))) continue;
    517       if (error(si->getAddress(Address))) continue;
    518       if (error(si->getFlags(Flags))) continue;
    519       if (error(si->getType(Type))) continue;
    520       if (error(si->getSize(Size))) continue;
    521       if (error(si->getSection(Section))) continue;
    522 
    523       bool Global = Flags & SymbolRef::SF_Global;
    524       bool Weak = Flags & SymbolRef::SF_Weak;
    525       bool Absolute = Flags & SymbolRef::SF_Absolute;
    526 
    527       if (Address == UnknownAddressOrSize)
    528         Address = 0;
    529       if (Size == UnknownAddressOrSize)
    530         Size = 0;
    531       char GlobLoc = ' ';
    532       if (Type != SymbolRef::ST_Unknown)
    533         GlobLoc = Global ? 'g' : 'l';
    534       char Debug = (Type == SymbolRef::ST_Debug || Type == SymbolRef::ST_File)
    535                    ? 'd' : ' ';
    536       char FileFunc = ' ';
    537       if (Type == SymbolRef::ST_File)
    538         FileFunc = 'f';
    539       else if (Type == SymbolRef::ST_Function)
    540         FileFunc = 'F';
    541 
    542       outs() << format("%08" PRIx64, Address) << " "
    543              << GlobLoc // Local -> 'l', Global -> 'g', Neither -> ' '
    544              << (Weak ? 'w' : ' ') // Weak?
    545              << ' ' // Constructor. Not supported yet.
    546              << ' ' // Warning. Not supported yet.
    547              << ' ' // Indirect reference to another symbol.
    548              << Debug // Debugging (d) or dynamic (D) symbol.
    549              << FileFunc // Name of function (F), file (f) or object (O).
    550              << ' ';
    551       if (Absolute)
    552         outs() << "*ABS*";
    553       else if (Section == o->end_sections())
    554         outs() << "*UND*";
    555       else {
    556         StringRef SectionName;
    557         if (error(Section->getName(SectionName)))
    558           SectionName = "";
    559         outs() << SectionName;
    560       }
    561       outs() << '\t'
    562              << format("%08" PRIx64 " ", Size)
    563              << Name
    564              << '\n';
    565     }
    566   }
    567 }
    568 
    569 static void DumpObject(const ObjectFile *o) {
    570   outs() << '\n';
    571   outs() << o->getFileName()
    572          << ":\tfile format " << o->getFileFormatName() << "\n\n";
    573 
    574   if (Disassemble)
    575     DisassembleObject(o, Relocations);
    576   if (Relocations && !Disassemble)
    577     PrintRelocations(o);
    578   if (SectionHeaders)
    579     PrintSectionHeaders(o);
    580   if (SectionContents)
    581     PrintSectionContents(o);
    582   if (SymbolTable)
    583     PrintSymbolTable(o);
    584 }
    585 
    586 /// @brief Dump each object file in \a a;
    587 static void DumpArchive(const Archive *a) {
    588   for (Archive::child_iterator i = a->begin_children(),
    589                                e = a->end_children(); i != e; ++i) {
    590     OwningPtr<Binary> child;
    591     if (error_code ec = i->getAsBinary(child)) {
    592       // Ignore non-object files.
    593       if (ec != object_error::invalid_file_type)
    594         errs() << ToolName << ": '" << a->getFileName() << "': " << ec.message()
    595                << ".\n";
    596       continue;
    597     }
    598     if (ObjectFile *o = dyn_cast<ObjectFile>(child.get()))
    599       DumpObject(o);
    600     else
    601       errs() << ToolName << ": '" << a->getFileName() << "': "
    602               << "Unrecognized file type.\n";
    603   }
    604 }
    605 
    606 /// @brief Open file and figure out how to dump it.
    607 static void DumpInput(StringRef file) {
    608   // If file isn't stdin, check that it exists.
    609   if (file != "-" && !sys::fs::exists(file)) {
    610     errs() << ToolName << ": '" << file << "': " << "No such file\n";
    611     return;
    612   }
    613 
    614   if (MachO && Disassemble) {
    615     DisassembleInputMachO(file);
    616     return;
    617   }
    618 
    619   // Attempt to open the binary.
    620   OwningPtr<Binary> binary;
    621   if (error_code ec = createBinary(file, binary)) {
    622     errs() << ToolName << ": '" << file << "': " << ec.message() << ".\n";
    623     return;
    624   }
    625 
    626   if (Archive *a = dyn_cast<Archive>(binary.get()))
    627     DumpArchive(a);
    628   else if (ObjectFile *o = dyn_cast<ObjectFile>(binary.get()))
    629     DumpObject(o);
    630   else
    631     errs() << ToolName << ": '" << file << "': " << "Unrecognized file type.\n";
    632 }
    633 
    634 int main(int argc, char **argv) {
    635   // Print a stack trace if we signal out.
    636   sys::PrintStackTraceOnErrorSignal();
    637   PrettyStackTraceProgram X(argc, argv);
    638   llvm_shutdown_obj Y;  // Call llvm_shutdown() on exit.
    639 
    640   // Initialize targets and assembly printers/parsers.
    641   llvm::InitializeAllTargetInfos();
    642   llvm::InitializeAllTargetMCs();
    643   llvm::InitializeAllAsmParsers();
    644   llvm::InitializeAllDisassemblers();
    645 
    646   // Register the target printer for --version.
    647   cl::AddExtraVersionPrinter(TargetRegistry::printRegisteredTargetsForVersion);
    648 
    649   cl::ParseCommandLineOptions(argc, argv, "llvm object file dumper\n");
    650   TripleName = Triple::normalize(TripleName);
    651 
    652   ToolName = argv[0];
    653 
    654   // Defaults to a.out if no filenames specified.
    655   if (InputFilenames.size() == 0)
    656     InputFilenames.push_back("a.out");
    657 
    658   if (!Disassemble
    659       && !Relocations
    660       && !SectionHeaders
    661       && !SectionContents
    662       && !SymbolTable) {
    663     cl::PrintHelpMessage();
    664     return 2;
    665   }
    666 
    667   std::for_each(InputFilenames.begin(), InputFilenames.end(),
    668                 DumpInput);
    669 
    670   return 0;
    671 }
    672