aboutsummaryrefslogtreecommitdiffstats
path: root/tools/llvm-objdump/llvm-objdump.cpp
blob: 6e62aaac235012ef81979f88eda43c557316f614 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
//===-- llvm-objdump.cpp - Object file dumping utility for llvm -----------===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This program is a utility that works like binutils "objdump", that is, it
// dumps out a plethora of information about an object file depending on the
// flags.
//
// The flags and output of this program should be near identical to those of
// binutils objdump.
//
//===----------------------------------------------------------------------===//

#include "llvm-objdump.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/ADT/Triple.h"
#include "llvm/MC/MCAsmInfo.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCDisassembler.h"
#include "llvm/MC/MCInst.h"
#include "llvm/MC/MCInstPrinter.h"
#include "llvm/MC/MCInstrAnalysis.h"
#include "llvm/MC/MCInstrInfo.h"
#include "llvm/MC/MCObjectFileInfo.h"
#include "llvm/MC/MCRegisterInfo.h"
#include "llvm/MC/MCRelocationInfo.h"
#include "llvm/MC/MCSubtargetInfo.h"
#include "llvm/Object/Archive.h"
#include "llvm/Object/COFF.h"
#include "llvm/Object/MachO.h"
#include "llvm/Object/ObjectFile.h"
#include "llvm/Support/Casting.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/FileSystem.h"
#include "llvm/Support/Format.h"
#include "llvm/Support/GraphWriter.h"
#include "llvm/Support/Host.h"
#include "llvm/Support/ManagedStatic.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/PrettyStackTrace.h"
#include "llvm/Support/Signals.h"
#include "llvm/Support/SourceMgr.h"
#include "llvm/Support/TargetRegistry.h"
#include "llvm/Support/TargetSelect.h"
#include "llvm/Support/raw_ostream.h"
#include <algorithm>
#include <cctype>
#include <cstring>
#include <system_error>

using namespace llvm;
using namespace object;

static cl::list<std::string>
InputFilenames(cl::Positional, cl::desc("<input object files>"),cl::ZeroOrMore);

cl::opt<bool>
llvm::Disassemble("disassemble",
  cl::desc("Display assembler mnemonics for the machine instructions"));
static cl::alias
Disassembled("d", cl::desc("Alias for --disassemble"),
             cl::aliasopt(Disassemble));

cl::opt<bool>
llvm::Relocations("r", cl::desc("Display the relocation entries in the file"));

cl::opt<bool>
llvm::SectionContents("s", cl::desc("Display the content of each section"));

cl::opt<bool>
llvm::SymbolTable("t", cl::desc("Display the symbol table"));

cl::opt<bool>
llvm::ExportsTrie("exports-trie", cl::desc("Display mach-o exported symbols"));

cl::opt<bool>
llvm::Rebase("rebase", cl::desc("Display mach-o rebasing info"));

cl::opt<bool>
llvm::Bind("bind", cl::desc("Display mach-o binding info"));

cl::opt<bool>
llvm::LazyBind("lazy-bind", cl::desc("Display mach-o lazy binding info"));

cl::opt<bool>
llvm::WeakBind("weak-bind", cl::desc("Display mach-o weak binding info"));

static cl::opt<bool>
MachOOpt("macho", cl::desc("Use MachO specific object file parser"));
static cl::alias
MachOm("m", cl::desc("Alias for --macho"), cl::aliasopt(MachOOpt));

cl::opt<std::string>
llvm::TripleName("triple", cl::desc("Target triple to disassemble for, "
                                    "see -version for available targets"));

cl::opt<std::string>
llvm::MCPU("mcpu",
     cl::desc("Target a specific cpu type (-mcpu=help for details)"),
     cl::value_desc("cpu-name"),
     cl::init(""));

cl::opt<std::string>
llvm::ArchName("arch-name", cl::desc("Target arch to disassemble for, "
                                "see -version for available targets"));

cl::opt<bool>
llvm::SectionHeaders("section-headers", cl::desc("Display summaries of the "
                                                 "headers for each section."));
static cl::alias
SectionHeadersShort("headers", cl::desc("Alias for --section-headers"),
                    cl::aliasopt(SectionHeaders));
static cl::alias
SectionHeadersShorter("h", cl::desc("Alias for --section-headers"),
                      cl::aliasopt(SectionHeaders));

cl::list<std::string>
llvm::MAttrs("mattr",
  cl::CommaSeparated,
  cl::desc("Target specific attributes"),
  cl::value_desc("a1,+a2,-a3,..."));

cl::opt<bool>
llvm::NoShowRawInsn("no-show-raw-insn", cl::desc("When disassembling "
                                                 "instructions, do not print "
                                                 "the instruction bytes."));

cl::opt<bool>
llvm::UnwindInfo("unwind-info", cl::desc("Display unwind information"));

static cl::alias
UnwindInfoShort("u", cl::desc("Alias for --unwind-info"),
                cl::aliasopt(UnwindInfo));

cl::opt<bool>
llvm::PrivateHeaders("private-headers",
                     cl::desc("Display format specific file headers"));

static cl::alias
PrivateHeadersShort("p", cl::desc("Alias for --private-headers"),
                    cl::aliasopt(PrivateHeaders));

static StringRef ToolName;
static int ReturnValue = EXIT_SUCCESS;

bool llvm::error(std::error_code EC) {
  if (!EC)
    return false;

  outs() << ToolName << ": error reading file: " << EC.message() << ".\n";
  outs().flush();
  ReturnValue = EXIT_FAILURE;
  return true;
}

static const Target *getTarget(const ObjectFile *Obj = nullptr) {
  // Figure out the target triple.
  llvm::Triple TheTriple("unknown-unknown-unknown");
  if (TripleName.empty()) {
    if (Obj) {
      TheTriple.setArch(Triple::ArchType(Obj->getArch()));
      // TheTriple defaults to ELF, and COFF doesn't have an environment:
      // the best we can do here is indicate that it is mach-o.
      if (Obj->isMachO())
        TheTriple.setObjectFormat(Triple::MachO);

      if (Obj->isCOFF()) {
        const auto COFFObj = dyn_cast<COFFObjectFile>(Obj);
        if (COFFObj->getArch() == Triple::thumb)
          TheTriple.setTriple("thumbv7-windows");
      }
    }
  } else
    TheTriple.setTriple(Triple::normalize(TripleName));

  // Get the target specific parser.
  std::string Error;
  const Target *TheTarget = TargetRegistry::lookupTarget(ArchName, TheTriple,
                                                         Error);
  if (!TheTarget) {
    errs() << ToolName << ": " << Error;
    return nullptr;
  }

  // Update the triple name and return the found target.
  TripleName = TheTriple.getTriple();
  return TheTarget;
}

void llvm::DumpBytes(StringRef bytes) {
  static const char hex_rep[] = "0123456789abcdef";
  // FIXME: The real way to do this is to figure out the longest instruction
  //        and align to that size before printing. I'll fix this when I get
  //        around to outputting relocations.
  // 15 is the longest x86 instruction
  // 3 is for the hex rep of a byte + a space.
  // 1 is for the null terminator.
  enum { OutputSize = (15 * 3) + 1 };
  char output[OutputSize];

  assert(bytes.size() <= 15
    && "DumpBytes only supports instructions of up to 15 bytes");
  memset(output, ' ', sizeof(output));
  unsigned index = 0;
  for (StringRef::iterator i = bytes.begin(),
                           e = bytes.end(); i != e; ++i) {
    output[index] = hex_rep[(*i & 0xF0) >> 4];
    output[index + 1] = hex_rep[*i & 0xF];
    index += 3;
  }

  output[sizeof(output) - 1] = 0;
  outs() << output;
}

bool llvm::RelocAddressLess(RelocationRef a, RelocationRef b) {
  uint64_t a_addr, b_addr;
  if (error(a.getOffset(a_addr))) return false;
  if (error(b.getOffset(b_addr))) return false;
  return a_addr < b_addr;
}

static void DisassembleObject(const ObjectFile *Obj, bool InlineRelocs) {
  const Target *TheTarget = getTarget(Obj);
  // getTarget() will have already issued a diagnostic if necessary, so
  // just bail here if it failed.
  if (!TheTarget)
    return;

  // Package up features to be passed to target/subtarget
  std::string FeaturesStr;
  if (MAttrs.size()) {
    SubtargetFeatures Features;
    for (unsigned i = 0; i != MAttrs.size(); ++i)
      Features.AddFeature(MAttrs[i]);
    FeaturesStr = Features.getString();
  }

  std::unique_ptr<const MCRegisterInfo> MRI(
      TheTarget->createMCRegInfo(TripleName));
  if (!MRI) {
    errs() << "error: no register info for target " << TripleName << "\n";
    return;
  }

  // Set up disassembler.
  std::unique_ptr<const MCAsmInfo> AsmInfo(
      TheTarget->createMCAsmInfo(*MRI, TripleName));
  if (!AsmInfo) {
    errs() << "error: no assembly info for target " << TripleName << "\n";
    return;
  }

  std::unique_ptr<const MCSubtargetInfo> STI(
      TheTarget->createMCSubtargetInfo(TripleName, MCPU, FeaturesStr));
  if (!STI) {
    errs() << "error: no subtarget info for target " << TripleName << "\n";
    return;
  }

  std::unique_ptr<const MCInstrInfo> MII(TheTarget->createMCInstrInfo());
  if (!MII) {
    errs() << "error: no instruction info for target " << TripleName << "\n";
    return;
  }

  std::unique_ptr<const MCObjectFileInfo> MOFI(new MCObjectFileInfo);
  MCContext Ctx(AsmInfo.get(), MRI.get(), MOFI.get());

  std::unique_ptr<MCDisassembler> DisAsm(
    TheTarget->createMCDisassembler(*STI, Ctx));

  if (!DisAsm) {
    errs() << "error: no disassembler for target " << TripleName << "\n";
    return;
  }

  std::unique_ptr<const MCInstrAnalysis> MIA(
      TheTarget->createMCInstrAnalysis(MII.get()));

  int AsmPrinterVariant = AsmInfo->getAssemblerDialect();
  std::unique_ptr<MCInstPrinter> IP(TheTarget->createMCInstPrinter(
      AsmPrinterVariant, *AsmInfo, *MII, *MRI, *STI));
  if (!IP) {
    errs() << "error: no instruction printer for target " << TripleName
      << '\n';
    return;
  }

  StringRef Fmt = Obj->getBytesInAddress() > 4 ? "\t\t%016" PRIx64 ":  " :
                                                 "\t\t\t%08" PRIx64 ":  ";

  // Create a mapping, RelocSecs = SectionRelocMap[S], where sections
  // in RelocSecs contain the relocations for section S.
  std::error_code EC;
  std::map<SectionRef, SmallVector<SectionRef, 1>> SectionRelocMap;
  for (const SectionRef &Section : Obj->sections()) {
    section_iterator Sec2 = Section.getRelocatedSection();
    if (Sec2 != Obj->section_end())
      SectionRelocMap[*Sec2].push_back(Section);
  }

  for (const SectionRef &Section : Obj->sections()) {
    if (!Section.isText() || Section.isVirtual())
      continue;

    uint64_t SectionAddr = Section.getAddress();
    uint64_t SectSize = Section.getSize();
    if (!SectSize)
      continue;

    // Make a list of all the symbols in this section.
    std::vector<std::pair<uint64_t, StringRef>> Symbols;
    for (const SymbolRef &Symbol : Obj->symbols()) {
      if (Section.containsSymbol(Symbol)) {
        uint64_t Address;
        if (error(Symbol.getAddress(Address)))
          break;
        if (Address == UnknownAddressOrSize)
          continue;
        Address -= SectionAddr;
        if (Address >= SectSize)
          continue;

        StringRef Name;
        if (error(Symbol.getName(Name)))
          break;
        Symbols.push_back(std::make_pair(Address, Name));
      }
    }

    // Sort the symbols by address, just in case they didn't come in that way.
    array_pod_sort(Symbols.begin(), Symbols.end());

    // Make a list of all the relocations for this section.
    std::vector<RelocationRef> Rels;
    if (InlineRelocs) {
      for (const SectionRef &RelocSec : SectionRelocMap[Section]) {
        for (const RelocationRef &Reloc : RelocSec.relocations()) {
          Rels.push_back(Reloc);
        }
      }
    }

    // Sort relocations by address.
    std::sort(Rels.begin(), Rels.end(), RelocAddressLess);

    StringRef SegmentName = "";
    if (const MachOObjectFile *MachO = dyn_cast<const MachOObjectFile>(Obj)) {
      DataRefImpl DR = Section.getRawDataRefImpl();
      SegmentName = MachO->getSectionFinalSegmentName(DR);
    }
    StringRef name;
    if (error(Section.getName(name)))
      break;
    outs() << "Disassembly of section ";
    if (!SegmentName.empty())
      outs() << SegmentName << ",";
    outs() << name << ':';

    // If the section has no symbols just insert a dummy one and disassemble
    // the whole section.
    if (Symbols.empty())
      Symbols.push_back(std::make_pair(0, name));


    SmallString<40> Comments;
    raw_svector_ostream CommentStream(Comments);

    StringRef BytesStr;
    if (error(Section.getContents(BytesStr)))
      break;
    ArrayRef<uint8_t> Bytes(reinterpret_cast<const uint8_t *>(BytesStr.data()),
                            BytesStr.size());

    uint64_t Size;
    uint64_t Index;

    std::vector<RelocationRef>::const_iterator rel_cur = Rels.begin();
    std::vector<RelocationRef>::const_iterator rel_end = Rels.end();
    // Disassemble symbol by symbol.
    for (unsigned si = 0, se = Symbols.size(); si != se; ++si) {

      uint64_t Start = Symbols[si].first;
      // The end is either the section end or the beginning of the next symbol.
      uint64_t End = (si == se - 1) ? SectSize : Symbols[si + 1].first;
      // If this symbol has the same address as the next symbol, then skip it.
      if (Start == End)
        continue;

      outs() << '\n' << Symbols[si].second << ":\n";

#ifndef NDEBUG
      raw_ostream &DebugOut = DebugFlag ? dbgs() : nulls();
#else
      raw_ostream &DebugOut = nulls();
#endif

      for (Index = Start; Index < End; Index += Size) {
        MCInst Inst;

        if (DisAsm->getInstruction(Inst, Size, Bytes.slice(Index),
                                   SectionAddr + Index, DebugOut,
                                   CommentStream)) {
          outs() << format("%8" PRIx64 ":", SectionAddr + Index);
          if (!NoShowRawInsn) {
            outs() << "\t";
            DumpBytes(StringRef(
                reinterpret_cast<const char *>(Bytes.data()) + Index, Size));
          }
          IP->printInst(&Inst, outs(), "");
          outs() << CommentStream.str();
          Comments.clear();
          outs() << "\n";
        } else {
          errs() << ToolName << ": warning: invalid instruction encoding\n";
          if (Size == 0)
            Size = 1; // skip illegible bytes
        }

        // Print relocation for instruction.
        while (rel_cur != rel_end) {
          bool hidden = false;
          uint64_t addr;
          SmallString<16> name;
          SmallString<32> val;

          // If this relocation is hidden, skip it.
          if (error(rel_cur->getHidden(hidden))) goto skip_print_rel;
          if (hidden) goto skip_print_rel;

          if (error(rel_cur->getOffset(addr))) goto skip_print_rel;
          // Stop when rel_cur's address is past the current instruction.
          if (addr >= Index + Size) break;
          if (error(rel_cur->getTypeName(name))) goto skip_print_rel;
          if (error(rel_cur->getValueString(val))) goto skip_print_rel;

          outs() << format(Fmt.data(), SectionAddr + addr) << name
                 << "\t" << val << "\n";

        skip_print_rel:
          ++rel_cur;
        }
      }
    }
  }
}

void llvm::PrintRelocations(const ObjectFile *Obj) {
  StringRef Fmt = Obj->getBytesInAddress() > 4 ? "%016" PRIx64 :
                                                 "%08" PRIx64;
  // Regular objdump doesn't print relocations in non-relocatable object
  // files.
  if (!Obj->isRelocatableObject())
    return;

  for (const SectionRef &Section : Obj->sections()) {
    if (Section.relocation_begin() == Section.relocation_end())
      continue;
    StringRef secname;
    if (error(Section.getName(secname)))
      continue;
    outs() << "RELOCATION RECORDS FOR [" << secname << "]:\n";
    for (const RelocationRef &Reloc : Section.relocations()) {
      bool hidden;
      uint64_t address;
      SmallString<32> relocname;
      SmallString<32> valuestr;
      if (error(Reloc.getHidden(hidden)))
        continue;
      if (hidden)
        continue;
      if (error(Reloc.getTypeName(relocname)))
        continue;
      if (error(Reloc.getOffset(address)))
        continue;
      if (error(Reloc.getValueString(valuestr)))
        continue;
      outs() << format(Fmt.data(), address) << " " << relocname << " "
             << valuestr << "\n";
    }
    outs() << "\n";
  }
}

void llvm::PrintSectionHeaders(const ObjectFile *Obj) {
  outs() << "Sections:\n"
            "Idx Name          Size      Address          Type\n";
  unsigned i = 0;
  for (const SectionRef &Section : Obj->sections()) {
    StringRef Name;
    if (error(Section.getName(Name)))
      return;
    uint64_t Address = Section.getAddress();
    uint64_t Size = Section.getSize();
    bool Text = Section.isText();
    bool Data = Section.isData();
    bool BSS = Section.isBSS();
    std::string Type = (std::string(Text ? "TEXT " : "") +
                        (Data ? "DATA " : "") + (BSS ? "BSS" : ""));
    outs() << format("%3d %-13s %08" PRIx64 " %016" PRIx64 " %s\n", i,
                     Name.str().c_str(), Size, Address, Type.c_str());
    ++i;
  }
}

void llvm::PrintSectionContents(const ObjectFile *Obj) {
  std::error_code EC;
  for (const SectionRef &Section : Obj->sections()) {
    StringRef Name;
    StringRef Contents;
    if (error(Section.getName(Name)))
      continue;
    uint64_t BaseAddr = Section.getAddress();
    uint64_t Size = Section.getSize();
    if (!Size)
      continue;

    outs() << "Contents of section " << Name << ":\n";
    if (Section.isBSS()) {
      outs() << format("<skipping contents of bss section at [%04" PRIx64
                       ", %04" PRIx64 ")>\n",
                       BaseAddr, BaseAddr + Size);
      continue;
    }

    if (error(Section.getContents(Contents)))
      continue;

    // Dump out the content as hex and printable ascii characters.
    for (std::size_t addr = 0, end = Contents.size(); addr < end; addr += 16) {
      outs() << format(" %04" PRIx64 " ", BaseAddr + addr);
      // Dump line of hex.
      for (std::size_t i = 0; i < 16; ++i) {
        if (i != 0 && i % 4 == 0)
          outs() << ' ';
        if (addr + i < end)
          outs() << hexdigit((Contents[addr + i] >> 4) & 0xF, true)
                 << hexdigit(Contents[addr + i] & 0xF, true);
        else
          outs() << "  ";
      }
      // Print ascii.
      outs() << "  ";
      for (std::size_t i = 0; i < 16 && addr + i < end; ++i) {
        if (std::isprint(static_cast<unsigned char>(Contents[addr + i]) & 0xFF))
          outs() << Contents[addr + i];
        else
          outs() << ".";
      }
      outs() << "\n";
    }
  }
}

static void PrintCOFFSymbolTable(const COFFObjectFile *coff) {
  for (unsigned SI = 0, SE = coff->getNumberOfSymbols(); SI != SE; ++SI) {
    ErrorOr<COFFSymbolRef> Symbol = coff->getSymbol(SI);
    StringRef Name;
    if (error(Symbol.getError()))
      return;

    if (error(coff->getSymbolName(*Symbol, Name)))
      return;

    outs() << "[" << format("%2d", SI) << "]"
           << "(sec " << format("%2d", int(Symbol->getSectionNumber())) << ")"
           << "(fl 0x00)" // Flag bits, which COFF doesn't have.
           << "(ty " << format("%3x", unsigned(Symbol->getType())) << ")"
           << "(scl " << format("%3x", unsigned(Symbol->getStorageClass())) << ") "
           << "(nx " << unsigned(Symbol->getNumberOfAuxSymbols()) << ") "
           << "0x" << format("%08x", unsigned(Symbol->getValue())) << " "
           << Name << "\n";

    for (unsigned AI = 0, AE = Symbol->getNumberOfAuxSymbols(); AI < AE; ++AI, ++SI) {
      if (Symbol->isSectionDefinition()) {
        const coff_aux_section_definition *asd;
        if (error(coff->getAuxSymbol<coff_aux_section_definition>(SI + 1, asd)))
          return;

        int32_t AuxNumber = asd->getNumber(Symbol->isBigObj());

        outs() << "AUX "
               << format("scnlen 0x%x nreloc %d nlnno %d checksum 0x%x "
                         , unsigned(asd->Length)
                         , unsigned(asd->NumberOfRelocations)
                         , unsigned(asd->NumberOfLinenumbers)
                         , unsigned(asd->CheckSum))
               << format("assoc %d comdat %d\n"
                         , unsigned(AuxNumber)
                         , unsigned(asd->Selection));
      } else if (Symbol->isFileRecord()) {
        const char *FileName;
        if (error(coff->getAuxSymbol<char>(SI + 1, FileName)))
          return;

        StringRef Name(FileName, Symbol->getNumberOfAuxSymbols() *
                                     coff->getSymbolTableEntrySize());
        outs() << "AUX " << Name.rtrim(StringRef("\0", 1))  << '\n';

        SI = SI + Symbol->getNumberOfAuxSymbols();
        break;
      } else {
        outs() << "AUX Unknown\n";
      }
    }
  }
}

void llvm::PrintSymbolTable(const ObjectFile *o) {
  outs() << "SYMBOL TABLE:\n";

  if (const COFFObjectFile *coff = dyn_cast<const COFFObjectFile>(o)) {
    PrintCOFFSymbolTable(coff);
    return;
  }
  for (const SymbolRef &Symbol : o->symbols()) {
    StringRef Name;
    uint64_t Address;
    SymbolRef::Type Type;
    uint64_t Size;
    uint32_t Flags = Symbol.getFlags();
    section_iterator Section = o->section_end();
    if (error(Symbol.getName(Name)))
      continue;
    if (error(Symbol.getAddress(Address)))
      continue;
    if (error(Symbol.getType(Type)))
      continue;
    if (error(Symbol.getSize(Size)))
      continue;
    if (error(Symbol.getSection(Section)))
      continue;

    bool Global = Flags & SymbolRef::SF_Global;
    bool Weak = Flags & SymbolRef::SF_Weak;
    bool Absolute = Flags & SymbolRef::SF_Absolute;
    bool Common = Flags & SymbolRef::SF_Common;

    if (Common) {
      uint32_t Alignment;
      if (error(Symbol.getAlignment(Alignment)))
        Alignment = 0;
      Address = Size;
      Size = Alignment;
    }
    if (Address == UnknownAddressOrSize)
      Address = 0;
    if (Size == UnknownAddressOrSize)
      Size = 0;
    char GlobLoc = ' ';
    if (Type != SymbolRef::ST_Unknown)
      GlobLoc = Global ? 'g' : 'l';
    char Debug = (Type == SymbolRef::ST_Debug || Type == SymbolRef::ST_File)
                 ? 'd' : ' ';
    char FileFunc = ' ';
    if (Type == SymbolRef::ST_File)
      FileFunc = 'f';
    else if (Type == SymbolRef::ST_Function)
      FileFunc = 'F';

    const char *Fmt = o->getBytesInAddress() > 4 ? "%016" PRIx64 :
                                                   "%08" PRIx64;

    outs() << format(Fmt, Address) << " "
           << GlobLoc // Local -> 'l', Global -> 'g', Neither -> ' '
           << (Weak ? 'w' : ' ') // Weak?
           << ' ' // Constructor. Not supported yet.
           << ' ' // Warning. Not supported yet.
           << ' ' // Indirect reference to another symbol.
           << Debug // Debugging (d) or dynamic (D) symbol.
           << FileFunc // Name of function (F), file (f) or object (O).
           << ' ';
    if (Absolute) {
      outs() << "*ABS*";
    } else if (Common) {
      outs() << "*COM*";
    } else if (Section == o->section_end()) {
      outs() << "*UND*";
    } else {
      if (const MachOObjectFile *MachO =
          dyn_cast<const MachOObjectFile>(o)) {
        DataRefImpl DR = Section->getRawDataRefImpl();
        StringRef SegmentName = MachO->getSectionFinalSegmentName(DR);
        outs() << SegmentName << ",";
      }
      StringRef SectionName;
      if (error(Section->getName(SectionName)))
        SectionName = "";
      outs() << SectionName;
    }
    outs() << '\t'
           << format("%08" PRIx64 " ", Size)
           << Name
           << '\n';
  }
}

static void PrintUnwindInfo(const ObjectFile *o) {
  outs() << "Unwind info:\n\n";

  if (const COFFObjectFile *coff = dyn_cast<COFFObjectFile>(o)) {
    printCOFFUnwindInfo(coff);
  } else if (const MachOObjectFile *MachO = dyn_cast<MachOObjectFile>(o))
    printMachOUnwindInfo(MachO);
  else {
    // TODO: Extract DWARF dump tool to objdump.
    errs() << "This operation is only currently supported "
              "for COFF and MachO object files.\n";
    return;
  }
}

void llvm::printExportsTrie(const ObjectFile *o) {
  outs() << "Exports trie:\n";
  if (const MachOObjectFile *MachO = dyn_cast<MachOObjectFile>(o))
    printMachOExportsTrie(MachO);
  else {
    errs() << "This operation is only currently supported "
              "for Mach-O executable files.\n";
    return;
  }
}

void llvm::printRebaseTable(const ObjectFile *o) {
  outs() << "Rebase table:\n";
  if (const MachOObjectFile *MachO = dyn_cast<MachOObjectFile>(o))
    printMachORebaseTable(MachO);
  else {
    errs() << "This operation is only currently supported "
              "for Mach-O executable files.\n";
    return;
  }
}

void llvm::printBindTable(const ObjectFile *o) {
  outs() << "Bind table:\n";
  if (const MachOObjectFile *MachO = dyn_cast<MachOObjectFile>(o))
    printMachOBindTable(MachO);
  else {
    errs() << "This operation is only currently supported "
              "for Mach-O executable files.\n";
    return;
  }
}

void llvm::printLazyBindTable(const ObjectFile *o) {
  outs() << "Lazy bind table:\n";
  if (const MachOObjectFile *MachO = dyn_cast<MachOObjectFile>(o))
    printMachOLazyBindTable(MachO);
  else {
    errs() << "This operation is only currently supported "
              "for Mach-O executable files.\n";
    return;
  }
}

void llvm::printWeakBindTable(const ObjectFile *o) {
  outs() << "Weak bind table:\n";
  if (const MachOObjectFile *MachO = dyn_cast<MachOObjectFile>(o))
    printMachOWeakBindTable(MachO);
  else {
    errs() << "This operation is only currently supported "
              "for Mach-O executable files.\n";
    return;
  }
}

static void printPrivateFileHeader(const ObjectFile *o) {
  if (o->isELF()) {
    printELFFileHeader(o);
  } else if (o->isCOFF()) {
    printCOFFFileHeader(o);
  } else if (o->isMachO()) {
    printMachOFileHeader(o);
  }
}

static void DumpObject(const ObjectFile *o) {
  outs() << '\n';
  outs() << o->getFileName()
         << ":\tfile format " << o->getFileFormatName() << "\n\n";

  if (Disassemble)
    DisassembleObject(o, Relocations);
  if (Relocations && !Disassemble)
    PrintRelocations(o);
  if (SectionHeaders)
    PrintSectionHeaders(o);
  if (SectionContents)
    PrintSectionContents(o);
  if (SymbolTable)
    PrintSymbolTable(o);
  if (UnwindInfo)
    PrintUnwindInfo(o);
  if (PrivateHeaders)
    printPrivateFileHeader(o);
  if (ExportsTrie)
    printExportsTrie(o);
  if (Rebase)
    printRebaseTable(o);
  if (Bind)
    printBindTable(o);
  if (LazyBind)
    printLazyBindTable(o);
  if (WeakBind)
    printWeakBindTable(o);
}

/// @brief Dump each object file in \a a;
static void DumpArchive(const Archive *a) {
  for (Archive::child_iterator i = a->child_begin(), e = a->child_end(); i != e;
       ++i) {
    ErrorOr<std::unique_ptr<Binary>> ChildOrErr = i->getAsBinary();
    if (std::error_code EC = ChildOrErr.getError()) {
      // Ignore non-object files.
      if (EC != object_error::invalid_file_type)
        errs() << ToolName << ": '" << a->getFileName() << "': " << EC.message()
               << ".\n";
      continue;
    }
    if (ObjectFile *o = dyn_cast<ObjectFile>(&*ChildOrErr.get()))
      DumpObject(o);
    else
      errs() << ToolName << ": '" << a->getFileName() << "': "
              << "Unrecognized file type.\n";
  }
}

/// @brief Open file and figure out how to dump it.
static void DumpInput(StringRef file) {
  // If file isn't stdin, check that it exists.
  if (file != "-" && !sys::fs::exists(file)) {
    errs() << ToolName << ": '" << file << "': " << "No such file\n";
    return;
  }

  // If we are using the Mach-O specific object file parser, then let it parse
  // the file and process the command line options.  So the -arch flags can
  // be used to select specific slices, etc.
  if (MachOOpt) {
    ParseInputMachO(file);
    return;
  }

  // Attempt to open the binary.
  ErrorOr<OwningBinary<Binary>> BinaryOrErr = createBinary(file);
  if (std::error_code EC = BinaryOrErr.getError()) {
    errs() << ToolName << ": '" << file << "': " << EC.message() << ".\n";
    return;
  }
  Binary &Binary = *BinaryOrErr.get().getBinary();

  if (Archive *a = dyn_cast<Archive>(&Binary))
    DumpArchive(a);
  else if (ObjectFile *o = dyn_cast<ObjectFile>(&Binary))
    DumpObject(o);
  else
    errs() << ToolName << ": '" << file << "': " << "Unrecognized file type.\n";
}

int main(int argc, char **argv) {
  // Print a stack trace if we signal out.
  sys::PrintStackTraceOnErrorSignal();
  PrettyStackTraceProgram X(argc, argv);
  llvm_shutdown_obj Y;  // Call llvm_shutdown() on exit.

  // Initialize targets and assembly printers/parsers.
  llvm::InitializeAllTargetInfos();
  llvm::InitializeAllTargetMCs();
  llvm::InitializeAllAsmParsers();
  llvm::InitializeAllDisassemblers();

  // Register the target printer for --version.
  cl::AddExtraVersionPrinter(TargetRegistry::printRegisteredTargetsForVersion);

  cl::ParseCommandLineOptions(argc, argv, "llvm object file dumper\n");
  TripleName = Triple::normalize(TripleName);

  ToolName = argv[0];

  // Defaults to a.out if no filenames specified.
  if (InputFilenames.size() == 0)
    InputFilenames.push_back("a.out");

  if (!Disassemble
      && !Relocations
      && !SectionHeaders
      && !SectionContents
      && !SymbolTable
      && !UnwindInfo
      && !PrivateHeaders
      && !ExportsTrie
      && !Rebase
      && !Bind
      && !LazyBind
      && !WeakBind
      && !(UniversalHeaders && MachOOpt)
      && !(ArchiveHeaders && MachOOpt)
      && !(IndirectSymbols && MachOOpt)
      && !(DataInCode && MachOOpt)
      && !(LinkOptHints && MachOOpt)
      && !(DumpSections.size() != 0 && MachOOpt)) {
    cl::PrintHelpMessage();
    return 2;
  }

  std::for_each(InputFilenames.begin(), InputFilenames.end(),
                DumpInput);

  return ReturnValue;
}