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      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 // The flags and output of this program should be near identical to those of
     15 // binutils objdump.
     16 //
     17 //===----------------------------------------------------------------------===//
     18 
     19 #include "llvm-objdump.h"
     20 #include "MCFunction.h"
     21 #include "llvm/ADT/OwningPtr.h"
     22 #include "llvm/ADT/STLExtras.h"
     23 #include "llvm/ADT/StringExtras.h"
     24 #include "llvm/ADT/Triple.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/Object/Archive.h"
     33 #include "llvm/Object/COFF.h"
     34 #include "llvm/Object/MachO.h"
     35 #include "llvm/Object/ObjectFile.h"
     36 #include "llvm/Support/Casting.h"
     37 #include "llvm/Support/CommandLine.h"
     38 #include "llvm/Support/Debug.h"
     39 #include "llvm/Support/FileSystem.h"
     40 #include "llvm/Support/Format.h"
     41 #include "llvm/Support/GraphWriter.h"
     42 #include "llvm/Support/Host.h"
     43 #include "llvm/Support/ManagedStatic.h"
     44 #include "llvm/Support/MemoryBuffer.h"
     45 #include "llvm/Support/MemoryObject.h"
     46 #include "llvm/Support/PrettyStackTrace.h"
     47 #include "llvm/Support/Signals.h"
     48 #include "llvm/Support/SourceMgr.h"
     49 #include "llvm/Support/TargetRegistry.h"
     50 #include "llvm/Support/TargetSelect.h"
     51 #include "llvm/Support/raw_ostream.h"
     52 #include "llvm/Support/system_error.h"
     53 #include <algorithm>
     54 #include <cctype>
     55 #include <cstring>
     56 using namespace llvm;
     57 using namespace object;
     58 
     59 static cl::list<std::string>
     60 InputFilenames(cl::Positional, cl::desc("<input object files>"),cl::ZeroOrMore);
     61 
     62 static cl::opt<bool>
     63 Disassemble("disassemble",
     64   cl::desc("Display assembler mnemonics for the machine instructions"));
     65 static cl::alias
     66 Disassembled("d", cl::desc("Alias for --disassemble"),
     67              cl::aliasopt(Disassemble));
     68 
     69 static cl::opt<bool>
     70 Relocations("r", cl::desc("Display the relocation entries in the file"));
     71 
     72 static cl::opt<bool>
     73 SectionContents("s", cl::desc("Display the content of each section"));
     74 
     75 static cl::opt<bool>
     76 SymbolTable("t", cl::desc("Display the symbol table"));
     77 
     78 static cl::opt<bool>
     79 MachOOpt("macho", cl::desc("Use MachO specific object file parser"));
     80 static cl::alias
     81 MachOm("m", cl::desc("Alias for --macho"), cl::aliasopt(MachOOpt));
     82 
     83 cl::opt<std::string>
     84 llvm::TripleName("triple", cl::desc("Target triple to disassemble for, "
     85                                     "see -version for available targets"));
     86 
     87 cl::opt<std::string>
     88 llvm::ArchName("arch", cl::desc("Target arch to disassemble for, "
     89                                 "see -version for available targets"));
     90 
     91 static cl::opt<bool>
     92 SectionHeaders("section-headers", cl::desc("Display summaries of the headers "
     93                                            "for each section."));
     94 static cl::alias
     95 SectionHeadersShort("headers", cl::desc("Alias for --section-headers"),
     96                     cl::aliasopt(SectionHeaders));
     97 static cl::alias
     98 SectionHeadersShorter("h", cl::desc("Alias for --section-headers"),
     99                       cl::aliasopt(SectionHeaders));
    100 
    101 static cl::list<std::string>
    102 MAttrs("mattr",
    103   cl::CommaSeparated,
    104   cl::desc("Target specific attributes"),
    105   cl::value_desc("a1,+a2,-a3,..."));
    106 
    107 static cl::opt<bool>
    108 NoShowRawInsn("no-show-raw-insn", cl::desc("When disassembling instructions, "
    109                                            "do not print the instruction bytes."));
    110 
    111 static cl::opt<bool>
    112 UnwindInfo("unwind-info", cl::desc("Display unwind information"));
    113 
    114 static cl::alias
    115 UnwindInfoShort("u", cl::desc("Alias for --unwind-info"),
    116                 cl::aliasopt(UnwindInfo));
    117 
    118 static cl::opt<bool>
    119 PrivateHeaders("private-headers",
    120                cl::desc("Display format specific file headers"));
    121 
    122 static cl::alias
    123 PrivateHeadersShort("p", cl::desc("Alias for --private-headers"),
    124                     cl::aliasopt(PrivateHeaders));
    125 
    126 static StringRef ToolName;
    127 
    128 bool llvm::error(error_code ec) {
    129   if (!ec) return false;
    130 
    131   outs() << ToolName << ": error reading file: " << ec.message() << ".\n";
    132   outs().flush();
    133   return true;
    134 }
    135 
    136 static const Target *getTarget(const ObjectFile *Obj = NULL) {
    137   // Figure out the target triple.
    138   llvm::Triple TheTriple("unknown-unknown-unknown");
    139   if (TripleName.empty()) {
    140     if (Obj)
    141       TheTriple.setArch(Triple::ArchType(Obj->getArch()));
    142   } else
    143     TheTriple.setTriple(Triple::normalize(TripleName));
    144 
    145   // Get the target specific parser.
    146   std::string Error;
    147   const Target *TheTarget = TargetRegistry::lookupTarget(ArchName, TheTriple,
    148                                                          Error);
    149   if (!TheTarget) {
    150     errs() << ToolName << ": " << Error;
    151     return 0;
    152   }
    153 
    154   // Update the triple name and return the found target.
    155   TripleName = TheTriple.getTriple();
    156   return TheTarget;
    157 }
    158 
    159 void llvm::StringRefMemoryObject::anchor() { }
    160 
    161 void llvm::DumpBytes(StringRef bytes) {
    162   static const char hex_rep[] = "0123456789abcdef";
    163   // FIXME: The real way to do this is to figure out the longest instruction
    164   //        and align to that size before printing. I'll fix this when I get
    165   //        around to outputting relocations.
    166   // 15 is the longest x86 instruction
    167   // 3 is for the hex rep of a byte + a space.
    168   // 1 is for the null terminator.
    169   enum { OutputSize = (15 * 3) + 1 };
    170   char output[OutputSize];
    171 
    172   assert(bytes.size() <= 15
    173     && "DumpBytes only supports instructions of up to 15 bytes");
    174   memset(output, ' ', sizeof(output));
    175   unsigned index = 0;
    176   for (StringRef::iterator i = bytes.begin(),
    177                            e = bytes.end(); i != e; ++i) {
    178     output[index] = hex_rep[(*i & 0xF0) >> 4];
    179     output[index + 1] = hex_rep[*i & 0xF];
    180     index += 3;
    181   }
    182 
    183   output[sizeof(output) - 1] = 0;
    184   outs() << output;
    185 }
    186 
    187 bool llvm::RelocAddressLess(RelocationRef a, RelocationRef b) {
    188   uint64_t a_addr, b_addr;
    189   if (error(a.getAddress(a_addr))) return false;
    190   if (error(b.getAddress(b_addr))) return false;
    191   return a_addr < b_addr;
    192 }
    193 
    194 static void DisassembleObject(const ObjectFile *Obj, bool InlineRelocs) {
    195   const Target *TheTarget = getTarget(Obj);
    196   // getTarget() will have already issued a diagnostic if necessary, so
    197   // just bail here if it failed.
    198   if (!TheTarget)
    199     return;
    200 
    201   // Package up features to be passed to target/subtarget
    202   std::string FeaturesStr;
    203   if (MAttrs.size()) {
    204     SubtargetFeatures Features;
    205     for (unsigned i = 0; i != MAttrs.size(); ++i)
    206       Features.AddFeature(MAttrs[i]);
    207     FeaturesStr = Features.getString();
    208   }
    209 
    210   error_code ec;
    211   for (section_iterator i = Obj->begin_sections(),
    212                         e = Obj->end_sections();
    213                         i != e; i.increment(ec)) {
    214     if (error(ec)) break;
    215     bool text;
    216     if (error(i->isText(text))) break;
    217     if (!text) continue;
    218 
    219     uint64_t SectionAddr;
    220     if (error(i->getAddress(SectionAddr))) break;
    221 
    222     // Make a list of all the symbols in this section.
    223     std::vector<std::pair<uint64_t, StringRef> > Symbols;
    224     for (symbol_iterator si = Obj->begin_symbols(),
    225                          se = Obj->end_symbols();
    226                          si != se; si.increment(ec)) {
    227       bool contains;
    228       if (!error(i->containsSymbol(*si, contains)) && contains) {
    229         uint64_t Address;
    230         if (error(si->getAddress(Address))) break;
    231         Address -= SectionAddr;
    232 
    233         StringRef Name;
    234         if (error(si->getName(Name))) break;
    235         Symbols.push_back(std::make_pair(Address, Name));
    236       }
    237     }
    238 
    239     // Sort the symbols by address, just in case they didn't come in that way.
    240     array_pod_sort(Symbols.begin(), Symbols.end());
    241 
    242     // Make a list of all the relocations for this section.
    243     std::vector<RelocationRef> Rels;
    244     if (InlineRelocs) {
    245       for (relocation_iterator ri = i->begin_relocations(),
    246                                re = i->end_relocations();
    247                                ri != re; ri.increment(ec)) {
    248         if (error(ec)) break;
    249         Rels.push_back(*ri);
    250       }
    251     }
    252 
    253     // Sort relocations by address.
    254     std::sort(Rels.begin(), Rels.end(), RelocAddressLess);
    255 
    256     StringRef SegmentName = "";
    257     if (const MachOObjectFile *MachO = dyn_cast<const MachOObjectFile>(Obj)) {
    258       DataRefImpl DR = i->getRawDataRefImpl();
    259       if (error(MachO->getSectionFinalSegmentName(DR, SegmentName)))
    260         break;
    261     }
    262     StringRef name;
    263     if (error(i->getName(name))) break;
    264     outs() << "Disassembly of section ";
    265     if (!SegmentName.empty())
    266       outs() << SegmentName << ",";
    267     outs() << name << ':';
    268 
    269     // If the section has no symbols just insert a dummy one and disassemble
    270     // the whole section.
    271     if (Symbols.empty())
    272       Symbols.push_back(std::make_pair(0, name));
    273 
    274     // Set up disassembler.
    275     OwningPtr<const MCAsmInfo> AsmInfo(TheTarget->createMCAsmInfo(TripleName));
    276 
    277     if (!AsmInfo) {
    278       errs() << "error: no assembly info for target " << TripleName << "\n";
    279       return;
    280     }
    281 
    282     OwningPtr<const MCSubtargetInfo> STI(
    283       TheTarget->createMCSubtargetInfo(TripleName, "", FeaturesStr));
    284 
    285     if (!STI) {
    286       errs() << "error: no subtarget info for target " << TripleName << "\n";
    287       return;
    288     }
    289 
    290     OwningPtr<const MCDisassembler> DisAsm(
    291       TheTarget->createMCDisassembler(*STI));
    292     if (!DisAsm) {
    293       errs() << "error: no disassembler for target " << TripleName << "\n";
    294       return;
    295     }
    296 
    297     OwningPtr<const MCRegisterInfo> MRI(TheTarget->createMCRegInfo(TripleName));
    298     if (!MRI) {
    299       errs() << "error: no register info for target " << TripleName << "\n";
    300       return;
    301     }
    302 
    303     OwningPtr<const MCInstrInfo> MII(TheTarget->createMCInstrInfo());
    304     if (!MII) {
    305       errs() << "error: no instruction info for target " << TripleName << "\n";
    306       return;
    307     }
    308 
    309     int AsmPrinterVariant = AsmInfo->getAssemblerDialect();
    310     OwningPtr<MCInstPrinter> IP(TheTarget->createMCInstPrinter(
    311                                 AsmPrinterVariant, *AsmInfo, *MII, *MRI, *STI));
    312     if (!IP) {
    313       errs() << "error: no instruction printer for target " << TripleName
    314              << '\n';
    315       return;
    316     }
    317 
    318     StringRef Bytes;
    319     if (error(i->getContents(Bytes))) break;
    320     StringRefMemoryObject memoryObject(Bytes);
    321     uint64_t Size;
    322     uint64_t Index;
    323     uint64_t SectSize;
    324     if (error(i->getSize(SectSize))) break;
    325 
    326     std::vector<RelocationRef>::const_iterator rel_cur = Rels.begin();
    327     std::vector<RelocationRef>::const_iterator rel_end = Rels.end();
    328     // Disassemble symbol by symbol.
    329     for (unsigned si = 0, se = Symbols.size(); si != se; ++si) {
    330       uint64_t Start = Symbols[si].first;
    331       uint64_t End;
    332       // The end is either the size of the section or the beginning of the next
    333       // symbol.
    334       if (si == se - 1)
    335         End = SectSize;
    336       // Make sure this symbol takes up space.
    337       else if (Symbols[si + 1].first != Start)
    338         End = Symbols[si + 1].first - 1;
    339       else
    340         // This symbol has the same address as the next symbol. Skip it.
    341         continue;
    342 
    343       outs() << '\n' << Symbols[si].second << ":\n";
    344 
    345 #ifndef NDEBUG
    346         raw_ostream &DebugOut = DebugFlag ? dbgs() : nulls();
    347 #else
    348         raw_ostream &DebugOut = nulls();
    349 #endif
    350 
    351       for (Index = Start; Index < End; Index += Size) {
    352         MCInst Inst;
    353 
    354         if (DisAsm->getInstruction(Inst, Size, memoryObject, Index,
    355                                    DebugOut, nulls())) {
    356           outs() << format("%8" PRIx64 ":", SectionAddr + Index);
    357           if (!NoShowRawInsn) {
    358             outs() << "\t";
    359             DumpBytes(StringRef(Bytes.data() + Index, Size));
    360           }
    361           IP->printInst(&Inst, outs(), "");
    362           outs() << "\n";
    363         } else {
    364           errs() << ToolName << ": warning: invalid instruction encoding\n";
    365           if (Size == 0)
    366             Size = 1; // skip illegible bytes
    367         }
    368 
    369         // Print relocation for instruction.
    370         while (rel_cur != rel_end) {
    371           bool hidden = false;
    372           uint64_t addr;
    373           SmallString<16> name;
    374           SmallString<32> val;
    375 
    376           // If this relocation is hidden, skip it.
    377           if (error(rel_cur->getHidden(hidden))) goto skip_print_rel;
    378           if (hidden) goto skip_print_rel;
    379 
    380           if (error(rel_cur->getAddress(addr))) goto skip_print_rel;
    381           // Stop when rel_cur's address is past the current instruction.
    382           if (addr >= Index + Size) break;
    383           if (error(rel_cur->getTypeName(name))) goto skip_print_rel;
    384           if (error(rel_cur->getValueString(val))) goto skip_print_rel;
    385 
    386           outs() << format("\t\t\t%8" PRIx64 ": ", SectionAddr + addr) << name
    387                  << "\t" << val << "\n";
    388 
    389         skip_print_rel:
    390           ++rel_cur;
    391         }
    392       }
    393     }
    394   }
    395 }
    396 
    397 static void PrintRelocations(const ObjectFile *o) {
    398   error_code ec;
    399   for (section_iterator si = o->begin_sections(), se = o->end_sections();
    400                                                   si != se; si.increment(ec)){
    401     if (error(ec)) return;
    402     if (si->begin_relocations() == si->end_relocations())
    403       continue;
    404     StringRef secname;
    405     if (error(si->getName(secname))) continue;
    406     outs() << "RELOCATION RECORDS FOR [" << secname << "]:\n";
    407     for (relocation_iterator ri = si->begin_relocations(),
    408                              re = si->end_relocations();
    409                              ri != re; ri.increment(ec)) {
    410       if (error(ec)) return;
    411 
    412       bool hidden;
    413       uint64_t address;
    414       SmallString<32> relocname;
    415       SmallString<32> valuestr;
    416       if (error(ri->getHidden(hidden))) continue;
    417       if (hidden) continue;
    418       if (error(ri->getTypeName(relocname))) continue;
    419       if (error(ri->getAddress(address))) continue;
    420       if (error(ri->getValueString(valuestr))) continue;
    421       outs() << address << " " << relocname << " " << valuestr << "\n";
    422     }
    423     outs() << "\n";
    424   }
    425 }
    426 
    427 static void PrintSectionHeaders(const ObjectFile *o) {
    428   outs() << "Sections:\n"
    429             "Idx Name          Size      Address          Type\n";
    430   error_code ec;
    431   unsigned i = 0;
    432   for (section_iterator si = o->begin_sections(), se = o->end_sections();
    433                                                   si != se; si.increment(ec)) {
    434     if (error(ec)) return;
    435     StringRef Name;
    436     if (error(si->getName(Name))) return;
    437     uint64_t Address;
    438     if (error(si->getAddress(Address))) return;
    439     uint64_t Size;
    440     if (error(si->getSize(Size))) return;
    441     bool Text, Data, BSS;
    442     if (error(si->isText(Text))) return;
    443     if (error(si->isData(Data))) return;
    444     if (error(si->isBSS(BSS))) return;
    445     std::string Type = (std::string(Text ? "TEXT " : "") +
    446                         (Data ? "DATA " : "") + (BSS ? "BSS" : ""));
    447     outs() << format("%3d %-13s %08" PRIx64 " %016" PRIx64 " %s\n",
    448                      i, Name.str().c_str(), Size, Address, Type.c_str());
    449     ++i;
    450   }
    451 }
    452 
    453 static void PrintSectionContents(const ObjectFile *o) {
    454   error_code ec;
    455   for (section_iterator si = o->begin_sections(),
    456                         se = o->end_sections();
    457                         si != se; si.increment(ec)) {
    458     if (error(ec)) return;
    459     StringRef Name;
    460     StringRef Contents;
    461     uint64_t BaseAddr;
    462     if (error(si->getName(Name))) continue;
    463     if (error(si->getContents(Contents))) continue;
    464     if (error(si->getAddress(BaseAddr))) continue;
    465 
    466     outs() << "Contents of section " << Name << ":\n";
    467 
    468     // Dump out the content as hex and printable ascii characters.
    469     for (std::size_t addr = 0, end = Contents.size(); addr < end; addr += 16) {
    470       outs() << format(" %04" PRIx64 " ", BaseAddr + addr);
    471       // Dump line of hex.
    472       for (std::size_t i = 0; i < 16; ++i) {
    473         if (i != 0 && i % 4 == 0)
    474           outs() << ' ';
    475         if (addr + i < end)
    476           outs() << hexdigit((Contents[addr + i] >> 4) & 0xF, true)
    477                  << hexdigit(Contents[addr + i] & 0xF, true);
    478         else
    479           outs() << "  ";
    480       }
    481       // Print ascii.
    482       outs() << "  ";
    483       for (std::size_t i = 0; i < 16 && addr + i < end; ++i) {
    484         if (std::isprint(static_cast<unsigned char>(Contents[addr + i]) & 0xFF))
    485           outs() << Contents[addr + i];
    486         else
    487           outs() << ".";
    488       }
    489       outs() << "\n";
    490     }
    491   }
    492 }
    493 
    494 static void PrintCOFFSymbolTable(const COFFObjectFile *coff) {
    495   const coff_file_header *header;
    496   if (error(coff->getHeader(header))) return;
    497   int aux_count = 0;
    498   const coff_symbol *symbol = 0;
    499   for (int i = 0, e = header->NumberOfSymbols; i != e; ++i) {
    500     if (aux_count--) {
    501       // Figure out which type of aux this is.
    502       if (symbol->StorageClass == COFF::IMAGE_SYM_CLASS_STATIC
    503           && symbol->Value == 0) { // Section definition.
    504         const coff_aux_section_definition *asd;
    505         if (error(coff->getAuxSymbol<coff_aux_section_definition>(i, asd)))
    506           return;
    507         outs() << "AUX "
    508                << format("scnlen 0x%x nreloc %d nlnno %d checksum 0x%x "
    509                          , unsigned(asd->Length)
    510                          , unsigned(asd->NumberOfRelocations)
    511                          , unsigned(asd->NumberOfLinenumbers)
    512                          , unsigned(asd->CheckSum))
    513                << format("assoc %d comdat %d\n"
    514                          , unsigned(asd->Number)
    515                          , unsigned(asd->Selection));
    516       } else
    517         outs() << "AUX Unknown\n";
    518     } else {
    519       StringRef name;
    520       if (error(coff->getSymbol(i, symbol))) return;
    521       if (error(coff->getSymbolName(symbol, name))) return;
    522       outs() << "[" << format("%2d", i) << "]"
    523              << "(sec " << format("%2d", int(symbol->SectionNumber)) << ")"
    524              << "(fl 0x00)" // Flag bits, which COFF doesn't have.
    525              << "(ty " << format("%3x", unsigned(symbol->Type)) << ")"
    526              << "(scl " << format("%3x", unsigned(symbol->StorageClass)) << ") "
    527              << "(nx " << unsigned(symbol->NumberOfAuxSymbols) << ") "
    528              << "0x" << format("%08x", unsigned(symbol->Value)) << " "
    529              << name << "\n";
    530       aux_count = symbol->NumberOfAuxSymbols;
    531     }
    532   }
    533 }
    534 
    535 static void PrintSymbolTable(const ObjectFile *o) {
    536   outs() << "SYMBOL TABLE:\n";
    537 
    538   if (const COFFObjectFile *coff = dyn_cast<const COFFObjectFile>(o))
    539     PrintCOFFSymbolTable(coff);
    540   else {
    541     error_code ec;
    542     for (symbol_iterator si = o->begin_symbols(),
    543                          se = o->end_symbols(); si != se; si.increment(ec)) {
    544       if (error(ec)) return;
    545       StringRef Name;
    546       uint64_t Address;
    547       SymbolRef::Type Type;
    548       uint64_t Size;
    549       uint32_t Flags;
    550       section_iterator Section = o->end_sections();
    551       if (error(si->getName(Name))) continue;
    552       if (error(si->getAddress(Address))) continue;
    553       if (error(si->getFlags(Flags))) continue;
    554       if (error(si->getType(Type))) continue;
    555       if (error(si->getSize(Size))) continue;
    556       if (error(si->getSection(Section))) continue;
    557 
    558       bool Global = Flags & SymbolRef::SF_Global;
    559       bool Weak = Flags & SymbolRef::SF_Weak;
    560       bool Absolute = Flags & SymbolRef::SF_Absolute;
    561 
    562       if (Address == UnknownAddressOrSize)
    563         Address = 0;
    564       if (Size == UnknownAddressOrSize)
    565         Size = 0;
    566       char GlobLoc = ' ';
    567       if (Type != SymbolRef::ST_Unknown)
    568         GlobLoc = Global ? 'g' : 'l';
    569       char Debug = (Type == SymbolRef::ST_Debug || Type == SymbolRef::ST_File)
    570                    ? 'd' : ' ';
    571       char FileFunc = ' ';
    572       if (Type == SymbolRef::ST_File)
    573         FileFunc = 'f';
    574       else if (Type == SymbolRef::ST_Function)
    575         FileFunc = 'F';
    576 
    577       const char *Fmt = o->getBytesInAddress() > 4 ? "%016" PRIx64 :
    578                                                      "%08" PRIx64;
    579 
    580       outs() << format(Fmt, Address) << " "
    581              << GlobLoc // Local -> 'l', Global -> 'g', Neither -> ' '
    582              << (Weak ? 'w' : ' ') // Weak?
    583              << ' ' // Constructor. Not supported yet.
    584              << ' ' // Warning. Not supported yet.
    585              << ' ' // Indirect reference to another symbol.
    586              << Debug // Debugging (d) or dynamic (D) symbol.
    587              << FileFunc // Name of function (F), file (f) or object (O).
    588              << ' ';
    589       if (Absolute)
    590         outs() << "*ABS*";
    591       else if (Section == o->end_sections())
    592         outs() << "*UND*";
    593       else {
    594         if (const MachOObjectFile *MachO = dyn_cast<const MachOObjectFile>(o)) {
    595           StringRef SegmentName;
    596           DataRefImpl DR = Section->getRawDataRefImpl();
    597           if (error(MachO->getSectionFinalSegmentName(DR, SegmentName)))
    598             SegmentName = "";
    599           outs() << SegmentName << ",";
    600         }
    601         StringRef SectionName;
    602         if (error(Section->getName(SectionName)))
    603           SectionName = "";
    604         outs() << SectionName;
    605       }
    606       outs() << '\t'
    607              << format("%08" PRIx64 " ", Size)
    608              << Name
    609              << '\n';
    610     }
    611   }
    612 }
    613 
    614 static void PrintUnwindInfo(const ObjectFile *o) {
    615   outs() << "Unwind info:\n\n";
    616 
    617   if (const COFFObjectFile *coff = dyn_cast<COFFObjectFile>(o)) {
    618     printCOFFUnwindInfo(coff);
    619   } else {
    620     // TODO: Extract DWARF dump tool to objdump.
    621     errs() << "This operation is only currently supported "
    622               "for COFF object files.\n";
    623     return;
    624   }
    625 }
    626 
    627 static void DumpObject(const ObjectFile *o) {
    628   outs() << '\n';
    629   outs() << o->getFileName()
    630          << ":\tfile format " << o->getFileFormatName() << "\n\n";
    631 
    632   if (Disassemble)
    633     DisassembleObject(o, Relocations);
    634   if (Relocations && !Disassemble)
    635     PrintRelocations(o);
    636   if (SectionHeaders)
    637     PrintSectionHeaders(o);
    638   if (SectionContents)
    639     PrintSectionContents(o);
    640   if (SymbolTable)
    641     PrintSymbolTable(o);
    642   if (UnwindInfo)
    643     PrintUnwindInfo(o);
    644   if (PrivateHeaders && o->isELF())
    645     printELFFileHeader(o);
    646 }
    647 
    648 /// @brief Dump each object file in \a a;
    649 static void DumpArchive(const Archive *a) {
    650   for (Archive::child_iterator i = a->begin_children(),
    651                                e = a->end_children(); i != e; ++i) {
    652     OwningPtr<Binary> child;
    653     if (error_code ec = i->getAsBinary(child)) {
    654       // Ignore non-object files.
    655       if (ec != object_error::invalid_file_type)
    656         errs() << ToolName << ": '" << a->getFileName() << "': " << ec.message()
    657                << ".\n";
    658       continue;
    659     }
    660     if (ObjectFile *o = dyn_cast<ObjectFile>(child.get()))
    661       DumpObject(o);
    662     else
    663       errs() << ToolName << ": '" << a->getFileName() << "': "
    664               << "Unrecognized file type.\n";
    665   }
    666 }
    667 
    668 /// @brief Open file and figure out how to dump it.
    669 static void DumpInput(StringRef file) {
    670   // If file isn't stdin, check that it exists.
    671   if (file != "-" && !sys::fs::exists(file)) {
    672     errs() << ToolName << ": '" << file << "': " << "No such file\n";
    673     return;
    674   }
    675 
    676   if (MachOOpt && Disassemble) {
    677     DisassembleInputMachO(file);
    678     return;
    679   }
    680 
    681   // Attempt to open the binary.
    682   OwningPtr<Binary> binary;
    683   if (error_code ec = createBinary(file, binary)) {
    684     errs() << ToolName << ": '" << file << "': " << ec.message() << ".\n";
    685     return;
    686   }
    687 
    688   if (Archive *a = dyn_cast<Archive>(binary.get()))
    689     DumpArchive(a);
    690   else if (ObjectFile *o = dyn_cast<ObjectFile>(binary.get()))
    691     DumpObject(o);
    692   else
    693     errs() << ToolName << ": '" << file << "': " << "Unrecognized file type.\n";
    694 }
    695 
    696 int main(int argc, char **argv) {
    697   // Print a stack trace if we signal out.
    698   sys::PrintStackTraceOnErrorSignal();
    699   PrettyStackTraceProgram X(argc, argv);
    700   llvm_shutdown_obj Y;  // Call llvm_shutdown() on exit.
    701 
    702   // Initialize targets and assembly printers/parsers.
    703   llvm::InitializeAllTargetInfos();
    704   llvm::InitializeAllTargetMCs();
    705   llvm::InitializeAllAsmParsers();
    706   llvm::InitializeAllDisassemblers();
    707 
    708   // Register the target printer for --version.
    709   cl::AddExtraVersionPrinter(TargetRegistry::printRegisteredTargetsForVersion);
    710 
    711   cl::ParseCommandLineOptions(argc, argv, "llvm object file dumper\n");
    712   TripleName = Triple::normalize(TripleName);
    713 
    714   ToolName = argv[0];
    715 
    716   // Defaults to a.out if no filenames specified.
    717   if (InputFilenames.size() == 0)
    718     InputFilenames.push_back("a.out");
    719 
    720   if (!Disassemble
    721       && !Relocations
    722       && !SectionHeaders
    723       && !SectionContents
    724       && !SymbolTable
    725       && !UnwindInfo
    726       && !PrivateHeaders) {
    727     cl::PrintHelpMessage();
    728     return 2;
    729   }
    730 
    731   std::for_each(InputFilenames.begin(), InputFilenames.end(),
    732                 DumpInput);
    733 
    734   return 0;
    735 }
    736