xref: /llvm-project/llvm/tools/llvm-objdump/llvm-objdump.cpp (revision 236b0ca79055779c4d024d66dcd0cbc44265df7f) 
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 "llvm/ADT/STLExtras.h"
21 #include "llvm/ADT/StringExtras.h"
22 #include "llvm/ADT/Triple.h"
23 #include "llvm/MC/MCAsmInfo.h"
24 #include "llvm/MC/MCContext.h"
25 #include "llvm/MC/MCDisassembler.h"
26 #include "llvm/MC/MCInst.h"
27 #include "llvm/MC/MCInstPrinter.h"
28 #include "llvm/MC/MCInstrAnalysis.h"
29 #include "llvm/MC/MCInstrInfo.h"
30 #include "llvm/MC/MCObjectFileInfo.h"
31 #include "llvm/MC/MCRegisterInfo.h"
32 #include "llvm/MC/MCRelocationInfo.h"
33 #include "llvm/MC/MCSubtargetInfo.h"
34 #include "llvm/Object/Archive.h"
35 #include "llvm/Object/COFF.h"
36 #include "llvm/Object/MachO.h"
37 #include "llvm/Object/ObjectFile.h"
38 #include "llvm/Support/Casting.h"
39 #include "llvm/Support/CommandLine.h"
40 #include "llvm/Support/Debug.h"
41 #include "llvm/Support/FileSystem.h"
42 #include "llvm/Support/Format.h"
43 #include "llvm/Support/GraphWriter.h"
44 #include "llvm/Support/Host.h"
45 #include "llvm/Support/ManagedStatic.h"
46 #include "llvm/Support/MemoryBuffer.h"
47 #include "llvm/Support/MemoryObject.h"
48 #include "llvm/Support/PrettyStackTrace.h"
49 #include "llvm/Support/Signals.h"
50 #include "llvm/Support/SourceMgr.h"
51 #include "llvm/Support/TargetRegistry.h"
52 #include "llvm/Support/TargetSelect.h"
53 #include "llvm/Support/raw_ostream.h"
54 #include <algorithm>
55 #include <cctype>
56 #include <cstring>
57 #include <system_error>
58 
59 using namespace llvm;
60 using namespace object;
61 
62 static cl::list<std::string>
63 InputFilenames(cl::Positional, cl::desc("<input object files>"),cl::ZeroOrMore);
64 
65 static cl::opt<bool>
66 Disassemble("disassemble",
67   cl::desc("Display assembler mnemonics for the machine instructions"));
68 static cl::alias
69 Disassembled("d", cl::desc("Alias for --disassemble"),
70              cl::aliasopt(Disassemble));
71 
72 static cl::opt<bool>
73 Relocations("r", cl::desc("Display the relocation entries in the file"));
74 
75 static cl::opt<bool>
76 SectionContents("s", cl::desc("Display the content of each section"));
77 
78 static cl::opt<bool>
79 SymbolTable("t", cl::desc("Display the symbol table"));
80 
81 static cl::opt<bool>
82 ExportsTrie("exports-trie", cl::desc("Display mach-o exported symbols"));
83 
84 static cl::opt<bool>
85 Rebase("rebase", cl::desc("Display mach-o rebasing info"));
86 
87 static cl::opt<bool>
88 Bind("bind", cl::desc("Display mach-o binding info"));
89 
90 static cl::opt<bool>
91 LazyBind("lazy-bind", cl::desc("Display mach-o lazy binding info"));
92 
93 static cl::opt<bool>
94 WeakBind("weak-bind", cl::desc("Display mach-o weak binding info"));
95 
96 static cl::opt<bool>
97 MachOOpt("macho", cl::desc("Use MachO specific object file parser"));
98 static cl::alias
99 MachOm("m", cl::desc("Alias for --macho"), cl::aliasopt(MachOOpt));
100 
101 cl::opt<std::string>
102 llvm::TripleName("triple", cl::desc("Target triple to disassemble for, "
103                                     "see -version for available targets"));
104 
105 cl::opt<std::string>
106 llvm::MCPU("mcpu",
107      cl::desc("Target a specific cpu type (-mcpu=help for details)"),
108      cl::value_desc("cpu-name"),
109      cl::init(""));
110 
111 cl::opt<std::string>
112 llvm::ArchName("arch", cl::desc("Target arch to disassemble for, "
113                                 "see -version for available targets"));
114 
115 static cl::opt<bool>
116 SectionHeaders("section-headers", cl::desc("Display summaries of the headers "
117                                            "for each section."));
118 static cl::alias
119 SectionHeadersShort("headers", cl::desc("Alias for --section-headers"),
120                     cl::aliasopt(SectionHeaders));
121 static cl::alias
122 SectionHeadersShorter("h", cl::desc("Alias for --section-headers"),
123                       cl::aliasopt(SectionHeaders));
124 
125 cl::list<std::string>
126 llvm::MAttrs("mattr",
127   cl::CommaSeparated,
128   cl::desc("Target specific attributes"),
129   cl::value_desc("a1,+a2,-a3,..."));
130 
131 cl::opt<bool>
132 llvm::NoShowRawInsn("no-show-raw-insn", cl::desc("When disassembling "
133                                                  "instructions, do not print "
134                                                  "the instruction bytes."));
135 
136 static cl::opt<bool>
137 UnwindInfo("unwind-info", cl::desc("Display unwind information"));
138 
139 static cl::alias
140 UnwindInfoShort("u", cl::desc("Alias for --unwind-info"),
141                 cl::aliasopt(UnwindInfo));
142 
143 static cl::opt<bool>
144 PrivateHeaders("private-headers",
145                cl::desc("Display format specific file headers"));
146 
147 static cl::alias
148 PrivateHeadersShort("p", cl::desc("Alias for --private-headers"),
149                     cl::aliasopt(PrivateHeaders));
150 
151 static StringRef ToolName;
152 
153 bool llvm::error(std::error_code EC) {
154   if (!EC)
155     return false;
156 
157   outs() << ToolName << ": error reading file: " << EC.message() << ".\n";
158   outs().flush();
159   return true;
160 }
161 
162 static const Target *getTarget(const ObjectFile *Obj = nullptr) {
163   // Figure out the target triple.
164   llvm::Triple TheTriple("unknown-unknown-unknown");
165   if (TripleName.empty()) {
166     if (Obj) {
167       TheTriple.setArch(Triple::ArchType(Obj->getArch()));
168       // TheTriple defaults to ELF, and COFF doesn't have an environment:
169       // the best we can do here is indicate that it is mach-o.
170       if (Obj->isMachO())
171         TheTriple.setObjectFormat(Triple::MachO);
172 
173       if (Obj->isCOFF()) {
174         const auto COFFObj = dyn_cast<COFFObjectFile>(Obj);
175         if (COFFObj->getArch() == Triple::thumb)
176           TheTriple.setTriple("thumbv7-windows");
177       }
178     }
179   } else
180     TheTriple.setTriple(Triple::normalize(TripleName));
181 
182   // Get the target specific parser.
183   std::string Error;
184   const Target *TheTarget = TargetRegistry::lookupTarget(ArchName, TheTriple,
185                                                          Error);
186   if (!TheTarget) {
187     errs() << ToolName << ": " << Error;
188     return nullptr;
189   }
190 
191   // Update the triple name and return the found target.
192   TripleName = TheTriple.getTriple();
193   return TheTarget;
194 }
195 
196 void llvm::DumpBytes(StringRef bytes) {
197   static const char hex_rep[] = "0123456789abcdef";
198   // FIXME: The real way to do this is to figure out the longest instruction
199   //        and align to that size before printing. I'll fix this when I get
200   //        around to outputting relocations.
201   // 15 is the longest x86 instruction
202   // 3 is for the hex rep of a byte + a space.
203   // 1 is for the null terminator.
204   enum { OutputSize = (15 * 3) + 1 };
205   char output[OutputSize];
206 
207   assert(bytes.size() <= 15
208     && "DumpBytes only supports instructions of up to 15 bytes");
209   memset(output, ' ', sizeof(output));
210   unsigned index = 0;
211   for (StringRef::iterator i = bytes.begin(),
212                            e = bytes.end(); i != e; ++i) {
213     output[index] = hex_rep[(*i & 0xF0) >> 4];
214     output[index + 1] = hex_rep[*i & 0xF];
215     index += 3;
216   }
217 
218   output[sizeof(output) - 1] = 0;
219   outs() << output;
220 }
221 
222 bool llvm::RelocAddressLess(RelocationRef a, RelocationRef b) {
223   uint64_t a_addr, b_addr;
224   if (error(a.getOffset(a_addr))) return false;
225   if (error(b.getOffset(b_addr))) return false;
226   return a_addr < b_addr;
227 }
228 
229 static void DisassembleObject(const ObjectFile *Obj, bool InlineRelocs) {
230   const Target *TheTarget = getTarget(Obj);
231   // getTarget() will have already issued a diagnostic if necessary, so
232   // just bail here if it failed.
233   if (!TheTarget)
234     return;
235 
236   // Package up features to be passed to target/subtarget
237   std::string FeaturesStr;
238   if (MAttrs.size()) {
239     SubtargetFeatures Features;
240     for (unsigned i = 0; i != MAttrs.size(); ++i)
241       Features.AddFeature(MAttrs[i]);
242     FeaturesStr = Features.getString();
243   }
244 
245   std::unique_ptr<const MCRegisterInfo> MRI(
246       TheTarget->createMCRegInfo(TripleName));
247   if (!MRI) {
248     errs() << "error: no register info for target " << TripleName << "\n";
249     return;
250   }
251 
252   // Set up disassembler.
253   std::unique_ptr<const MCAsmInfo> AsmInfo(
254       TheTarget->createMCAsmInfo(*MRI, TripleName));
255   if (!AsmInfo) {
256     errs() << "error: no assembly info for target " << TripleName << "\n";
257     return;
258   }
259 
260   std::unique_ptr<const MCSubtargetInfo> STI(
261       TheTarget->createMCSubtargetInfo(TripleName, MCPU, FeaturesStr));
262   if (!STI) {
263     errs() << "error: no subtarget info for target " << TripleName << "\n";
264     return;
265   }
266 
267   std::unique_ptr<const MCInstrInfo> MII(TheTarget->createMCInstrInfo());
268   if (!MII) {
269     errs() << "error: no instruction info for target " << TripleName << "\n";
270     return;
271   }
272 
273   std::unique_ptr<const MCObjectFileInfo> MOFI(new MCObjectFileInfo);
274   MCContext Ctx(AsmInfo.get(), MRI.get(), MOFI.get());
275 
276   std::unique_ptr<MCDisassembler> DisAsm(
277     TheTarget->createMCDisassembler(*STI, Ctx));
278 
279   if (!DisAsm) {
280     errs() << "error: no disassembler for target " << TripleName << "\n";
281     return;
282   }
283 
284   std::unique_ptr<const MCInstrAnalysis> MIA(
285       TheTarget->createMCInstrAnalysis(MII.get()));
286 
287   int AsmPrinterVariant = AsmInfo->getAssemblerDialect();
288   std::unique_ptr<MCInstPrinter> IP(TheTarget->createMCInstPrinter(
289       AsmPrinterVariant, *AsmInfo, *MII, *MRI, *STI));
290   if (!IP) {
291     errs() << "error: no instruction printer for target " << TripleName
292       << '\n';
293     return;
294   }
295 
296   StringRef Fmt = Obj->getBytesInAddress() > 4 ? "\t\t%016" PRIx64 ":  " :
297                                                  "\t\t\t%08" PRIx64 ":  ";
298 
299   // Create a mapping, RelocSecs = SectionRelocMap[S], where sections
300   // in RelocSecs contain the relocations for section S.
301   std::error_code EC;
302   std::map<SectionRef, SmallVector<SectionRef, 1>> SectionRelocMap;
303   for (const SectionRef &Section : Obj->sections()) {
304     section_iterator Sec2 = Section.getRelocatedSection();
305     if (Sec2 != Obj->section_end())
306       SectionRelocMap[*Sec2].push_back(Section);
307   }
308 
309   for (const SectionRef &Section : Obj->sections()) {
310     if (!Section.isText() || Section.isVirtual())
311       continue;
312 
313     uint64_t SectionAddr = Section.getAddress();
314     uint64_t SectSize = Section.getSize();
315     if (!SectSize)
316       continue;
317 
318     // Make a list of all the symbols in this section.
319     std::vector<std::pair<uint64_t, StringRef>> Symbols;
320     for (const SymbolRef &Symbol : Obj->symbols()) {
321       if (Section.containsSymbol(Symbol)) {
322         uint64_t Address;
323         if (error(Symbol.getAddress(Address)))
324           break;
325         if (Address == UnknownAddressOrSize)
326           continue;
327         Address -= SectionAddr;
328         if (Address >= SectSize)
329           continue;
330 
331         StringRef Name;
332         if (error(Symbol.getName(Name)))
333           break;
334         Symbols.push_back(std::make_pair(Address, Name));
335       }
336     }
337 
338     // Sort the symbols by address, just in case they didn't come in that way.
339     array_pod_sort(Symbols.begin(), Symbols.end());
340 
341     // Make a list of all the relocations for this section.
342     std::vector<RelocationRef> Rels;
343     if (InlineRelocs) {
344       for (const SectionRef &RelocSec : SectionRelocMap[Section]) {
345         for (const RelocationRef &Reloc : RelocSec.relocations()) {
346           Rels.push_back(Reloc);
347         }
348       }
349     }
350 
351     // Sort relocations by address.
352     std::sort(Rels.begin(), Rels.end(), RelocAddressLess);
353 
354     StringRef SegmentName = "";
355     if (const MachOObjectFile *MachO = dyn_cast<const MachOObjectFile>(Obj)) {
356       DataRefImpl DR = Section.getRawDataRefImpl();
357       SegmentName = MachO->getSectionFinalSegmentName(DR);
358     }
359     StringRef name;
360     if (error(Section.getName(name)))
361       break;
362     outs() << "Disassembly of section ";
363     if (!SegmentName.empty())
364       outs() << SegmentName << ",";
365     outs() << name << ':';
366 
367     // If the section has no symbols just insert a dummy one and disassemble
368     // the whole section.
369     if (Symbols.empty())
370       Symbols.push_back(std::make_pair(0, name));
371 
372 
373     SmallString<40> Comments;
374     raw_svector_ostream CommentStream(Comments);
375 
376     StringRef BytesStr;
377     if (error(Section.getContents(BytesStr)))
378       break;
379     ArrayRef<uint8_t> Bytes(reinterpret_cast<const uint8_t *>(BytesStr.data()),
380                             BytesStr.size());
381 
382     uint64_t Size;
383     uint64_t Index;
384 
385     std::vector<RelocationRef>::const_iterator rel_cur = Rels.begin();
386     std::vector<RelocationRef>::const_iterator rel_end = Rels.end();
387     // Disassemble symbol by symbol.
388     for (unsigned si = 0, se = Symbols.size(); si != se; ++si) {
389 
390       uint64_t Start = Symbols[si].first;
391       // The end is either the section end or the beginning of the next symbol.
392       uint64_t End = (si == se - 1) ? SectSize : Symbols[si + 1].first;
393       // If this symbol has the same address as the next symbol, then skip it.
394       if (Start == End)
395         continue;
396 
397       outs() << '\n' << Symbols[si].second << ":\n";
398 
399 #ifndef NDEBUG
400       raw_ostream &DebugOut = DebugFlag ? dbgs() : nulls();
401 #else
402       raw_ostream &DebugOut = nulls();
403 #endif
404 
405       for (Index = Start; Index < End; Index += Size) {
406         MCInst Inst;
407 
408         if (DisAsm->getInstruction(Inst, Size, Bytes.slice(Index),
409                                    SectionAddr + Index, DebugOut,
410                                    CommentStream)) {
411           outs() << format("%8" PRIx64 ":", SectionAddr + Index);
412           if (!NoShowRawInsn) {
413             outs() << "\t";
414             DumpBytes(StringRef(
415                 reinterpret_cast<const char *>(Bytes.data()) + Index, Size));
416           }
417           IP->printInst(&Inst, outs(), "");
418           outs() << CommentStream.str();
419           Comments.clear();
420           outs() << "\n";
421         } else {
422           errs() << ToolName << ": warning: invalid instruction encoding\n";
423           if (Size == 0)
424             Size = 1; // skip illegible bytes
425         }
426 
427         // Print relocation for instruction.
428         while (rel_cur != rel_end) {
429           bool hidden = false;
430           uint64_t addr;
431           SmallString<16> name;
432           SmallString<32> val;
433 
434           // If this relocation is hidden, skip it.
435           if (error(rel_cur->getHidden(hidden))) goto skip_print_rel;
436           if (hidden) goto skip_print_rel;
437 
438           if (error(rel_cur->getOffset(addr))) goto skip_print_rel;
439           // Stop when rel_cur's address is past the current instruction.
440           if (addr >= Index + Size) break;
441           if (error(rel_cur->getTypeName(name))) goto skip_print_rel;
442           if (error(rel_cur->getValueString(val))) goto skip_print_rel;
443 
444           outs() << format(Fmt.data(), SectionAddr + addr) << name
445                  << "\t" << val << "\n";
446 
447         skip_print_rel:
448           ++rel_cur;
449         }
450       }
451     }
452   }
453 }
454 
455 static void PrintRelocations(const ObjectFile *Obj) {
456   StringRef Fmt = Obj->getBytesInAddress() > 4 ? "%016" PRIx64 :
457                                                  "%08" PRIx64;
458   // Regular objdump doesn't print relocations in non-relocatable object
459   // files.
460   if (!Obj->isRelocatableObject())
461     return;
462 
463   for (const SectionRef &Section : Obj->sections()) {
464     if (Section.relocation_begin() == Section.relocation_end())
465       continue;
466     StringRef secname;
467     if (error(Section.getName(secname)))
468       continue;
469     outs() << "RELOCATION RECORDS FOR [" << secname << "]:\n";
470     for (const RelocationRef &Reloc : Section.relocations()) {
471       bool hidden;
472       uint64_t address;
473       SmallString<32> relocname;
474       SmallString<32> valuestr;
475       if (error(Reloc.getHidden(hidden)))
476         continue;
477       if (hidden)
478         continue;
479       if (error(Reloc.getTypeName(relocname)))
480         continue;
481       if (error(Reloc.getOffset(address)))
482         continue;
483       if (error(Reloc.getValueString(valuestr)))
484         continue;
485       outs() << format(Fmt.data(), address) << " " << relocname << " "
486              << valuestr << "\n";
487     }
488     outs() << "\n";
489   }
490 }
491 
492 static void PrintSectionHeaders(const ObjectFile *Obj) {
493   outs() << "Sections:\n"
494             "Idx Name          Size      Address          Type\n";
495   unsigned i = 0;
496   for (const SectionRef &Section : Obj->sections()) {
497     StringRef Name;
498     if (error(Section.getName(Name)))
499       return;
500     uint64_t Address = Section.getAddress();
501     uint64_t Size = Section.getSize();
502     bool Text = Section.isText();
503     bool Data = Section.isData();
504     bool BSS = Section.isBSS();
505     std::string Type = (std::string(Text ? "TEXT " : "") +
506                         (Data ? "DATA " : "") + (BSS ? "BSS" : ""));
507     outs() << format("%3d %-13s %08" PRIx64 " %016" PRIx64 " %s\n", i,
508                      Name.str().c_str(), Size, Address, Type.c_str());
509     ++i;
510   }
511 }
512 
513 static void PrintSectionContents(const ObjectFile *Obj) {
514   std::error_code EC;
515   for (const SectionRef &Section : Obj->sections()) {
516     StringRef Name;
517     StringRef Contents;
518     if (error(Section.getName(Name)))
519       continue;
520     uint64_t BaseAddr = Section.getAddress();
521     uint64_t Size = Section.getSize();
522     if (!Size)
523       continue;
524 
525     outs() << "Contents of section " << Name << ":\n";
526     if (Section.isBSS()) {
527       outs() << format("<skipping contents of bss section at [%04" PRIx64
528                        ", %04" PRIx64 ")>\n",
529                        BaseAddr, BaseAddr + Size);
530       continue;
531     }
532 
533     if (error(Section.getContents(Contents)))
534       continue;
535 
536     // Dump out the content as hex and printable ascii characters.
537     for (std::size_t addr = 0, end = Contents.size(); addr < end; addr += 16) {
538       outs() << format(" %04" PRIx64 " ", BaseAddr + addr);
539       // Dump line of hex.
540       for (std::size_t i = 0; i < 16; ++i) {
541         if (i != 0 && i % 4 == 0)
542           outs() << ' ';
543         if (addr + i < end)
544           outs() << hexdigit((Contents[addr + i] >> 4) & 0xF, true)
545                  << hexdigit(Contents[addr + i] & 0xF, true);
546         else
547           outs() << "  ";
548       }
549       // Print ascii.
550       outs() << "  ";
551       for (std::size_t i = 0; i < 16 && addr + i < end; ++i) {
552         if (std::isprint(static_cast<unsigned char>(Contents[addr + i]) & 0xFF))
553           outs() << Contents[addr + i];
554         else
555           outs() << ".";
556       }
557       outs() << "\n";
558     }
559   }
560 }
561 
562 static void PrintCOFFSymbolTable(const COFFObjectFile *coff) {
563   for (unsigned SI = 0, SE = coff->getNumberOfSymbols(); SI != SE; ++SI) {
564     ErrorOr<COFFSymbolRef> Symbol = coff->getSymbol(SI);
565     StringRef Name;
566     if (error(Symbol.getError()))
567       return;
568 
569     if (error(coff->getSymbolName(*Symbol, Name)))
570       return;
571 
572     outs() << "[" << format("%2d", SI) << "]"
573            << "(sec " << format("%2d", int(Symbol->getSectionNumber())) << ")"
574            << "(fl 0x00)" // Flag bits, which COFF doesn't have.
575            << "(ty " << format("%3x", unsigned(Symbol->getType())) << ")"
576            << "(scl " << format("%3x", unsigned(Symbol->getStorageClass())) << ") "
577            << "(nx " << unsigned(Symbol->getNumberOfAuxSymbols()) << ") "
578            << "0x" << format("%08x", unsigned(Symbol->getValue())) << " "
579            << Name << "\n";
580 
581     for (unsigned AI = 0, AE = Symbol->getNumberOfAuxSymbols(); AI < AE; ++AI, ++SI) {
582       if (Symbol->isSectionDefinition()) {
583         const coff_aux_section_definition *asd;
584         if (error(coff->getAuxSymbol<coff_aux_section_definition>(SI + 1, asd)))
585           return;
586 
587         int32_t AuxNumber = asd->getNumber(Symbol->isBigObj());
588 
589         outs() << "AUX "
590                << format("scnlen 0x%x nreloc %d nlnno %d checksum 0x%x "
591                          , unsigned(asd->Length)
592                          , unsigned(asd->NumberOfRelocations)
593                          , unsigned(asd->NumberOfLinenumbers)
594                          , unsigned(asd->CheckSum))
595                << format("assoc %d comdat %d\n"
596                          , unsigned(AuxNumber)
597                          , unsigned(asd->Selection));
598       } else if (Symbol->isFileRecord()) {
599         const char *FileName;
600         if (error(coff->getAuxSymbol<char>(SI + 1, FileName)))
601           return;
602 
603         StringRef Name(FileName, Symbol->getNumberOfAuxSymbols() *
604                                      coff->getSymbolTableEntrySize());
605         outs() << "AUX " << Name.rtrim(StringRef("\0", 1))  << '\n';
606 
607         SI = SI + Symbol->getNumberOfAuxSymbols();
608         break;
609       } else {
610         outs() << "AUX Unknown\n";
611       }
612     }
613   }
614 }
615 
616 static void PrintSymbolTable(const ObjectFile *o) {
617   outs() << "SYMBOL TABLE:\n";
618 
619   if (const COFFObjectFile *coff = dyn_cast<const COFFObjectFile>(o)) {
620     PrintCOFFSymbolTable(coff);
621     return;
622   }
623   for (const SymbolRef &Symbol : o->symbols()) {
624     StringRef Name;
625     uint64_t Address;
626     SymbolRef::Type Type;
627     uint64_t Size;
628     uint32_t Flags = Symbol.getFlags();
629     section_iterator Section = o->section_end();
630     if (error(Symbol.getName(Name)))
631       continue;
632     if (error(Symbol.getAddress(Address)))
633       continue;
634     if (error(Symbol.getType(Type)))
635       continue;
636     if (error(Symbol.getSize(Size)))
637       continue;
638     if (error(Symbol.getSection(Section)))
639       continue;
640 
641     bool Global = Flags & SymbolRef::SF_Global;
642     bool Weak = Flags & SymbolRef::SF_Weak;
643     bool Absolute = Flags & SymbolRef::SF_Absolute;
644 
645     if (Address == UnknownAddressOrSize)
646       Address = 0;
647     if (Size == UnknownAddressOrSize)
648       Size = 0;
649     char GlobLoc = ' ';
650     if (Type != SymbolRef::ST_Unknown)
651       GlobLoc = Global ? 'g' : 'l';
652     char Debug = (Type == SymbolRef::ST_Debug || Type == SymbolRef::ST_File)
653                  ? 'd' : ' ';
654     char FileFunc = ' ';
655     if (Type == SymbolRef::ST_File)
656       FileFunc = 'f';
657     else if (Type == SymbolRef::ST_Function)
658       FileFunc = 'F';
659 
660     const char *Fmt = o->getBytesInAddress() > 4 ? "%016" PRIx64 :
661                                                    "%08" PRIx64;
662 
663     outs() << format(Fmt, Address) << " "
664            << GlobLoc // Local -> 'l', Global -> 'g', Neither -> ' '
665            << (Weak ? 'w' : ' ') // Weak?
666            << ' ' // Constructor. Not supported yet.
667            << ' ' // Warning. Not supported yet.
668            << ' ' // Indirect reference to another symbol.
669            << Debug // Debugging (d) or dynamic (D) symbol.
670            << FileFunc // Name of function (F), file (f) or object (O).
671            << ' ';
672     if (Absolute) {
673       outs() << "*ABS*";
674     } else if (Section == o->section_end()) {
675       outs() << "*UND*";
676     } else {
677       if (const MachOObjectFile *MachO =
678           dyn_cast<const MachOObjectFile>(o)) {
679         DataRefImpl DR = Section->getRawDataRefImpl();
680         StringRef SegmentName = MachO->getSectionFinalSegmentName(DR);
681         outs() << SegmentName << ",";
682       }
683       StringRef SectionName;
684       if (error(Section->getName(SectionName)))
685         SectionName = "";
686       outs() << SectionName;
687     }
688     outs() << '\t'
689            << format("%08" PRIx64 " ", Size)
690            << Name
691            << '\n';
692   }
693 }
694 
695 static void PrintUnwindInfo(const ObjectFile *o) {
696   outs() << "Unwind info:\n\n";
697 
698   if (const COFFObjectFile *coff = dyn_cast<COFFObjectFile>(o)) {
699     printCOFFUnwindInfo(coff);
700   } else if (const MachOObjectFile *MachO = dyn_cast<MachOObjectFile>(o))
701     printMachOUnwindInfo(MachO);
702   else {
703     // TODO: Extract DWARF dump tool to objdump.
704     errs() << "This operation is only currently supported "
705               "for COFF and MachO object files.\n";
706     return;
707   }
708 }
709 
710 static void printExportsTrie(const ObjectFile *o) {
711   outs() << "Exports trie:\n";
712   if (const MachOObjectFile *MachO = dyn_cast<MachOObjectFile>(o))
713     printMachOExportsTrie(MachO);
714   else {
715     errs() << "This operation is only currently supported "
716               "for Mach-O executable files.\n";
717     return;
718   }
719 }
720 
721 static void printRebaseTable(const ObjectFile *o) {
722   outs() << "Rebase table:\n";
723   if (const MachOObjectFile *MachO = dyn_cast<MachOObjectFile>(o))
724     printMachORebaseTable(MachO);
725   else {
726     errs() << "This operation is only currently supported "
727               "for Mach-O executable files.\n";
728     return;
729   }
730 }
731 
732 static void printBindTable(const ObjectFile *o) {
733   outs() << "Bind table:\n";
734   if (const MachOObjectFile *MachO = dyn_cast<MachOObjectFile>(o))
735     printMachOBindTable(MachO);
736   else {
737     errs() << "This operation is only currently supported "
738               "for Mach-O executable files.\n";
739     return;
740   }
741 }
742 
743 static void printLazyBindTable(const ObjectFile *o) {
744   outs() << "Lazy bind table:\n";
745   if (const MachOObjectFile *MachO = dyn_cast<MachOObjectFile>(o))
746     printMachOLazyBindTable(MachO);
747   else {
748     errs() << "This operation is only currently supported "
749               "for Mach-O executable files.\n";
750     return;
751   }
752 }
753 
754 static void printWeakBindTable(const ObjectFile *o) {
755   outs() << "Weak bind table:\n";
756   if (const MachOObjectFile *MachO = dyn_cast<MachOObjectFile>(o))
757     printMachOWeakBindTable(MachO);
758   else {
759     errs() << "This operation is only currently supported "
760               "for Mach-O executable files.\n";
761     return;
762   }
763 }
764 
765 static void printPrivateFileHeader(const ObjectFile *o) {
766   if (o->isELF()) {
767     printELFFileHeader(o);
768   } else if (o->isCOFF()) {
769     printCOFFFileHeader(o);
770   } else if (o->isMachO()) {
771     printMachOFileHeader(o);
772   }
773 }
774 
775 static void DumpObject(const ObjectFile *o) {
776   outs() << '\n';
777   outs() << o->getFileName()
778          << ":\tfile format " << o->getFileFormatName() << "\n\n";
779 
780   if (Disassemble)
781     DisassembleObject(o, Relocations);
782   if (Relocations && !Disassemble)
783     PrintRelocations(o);
784   if (SectionHeaders)
785     PrintSectionHeaders(o);
786   if (SectionContents)
787     PrintSectionContents(o);
788   if (SymbolTable)
789     PrintSymbolTable(o);
790   if (UnwindInfo)
791     PrintUnwindInfo(o);
792   if (PrivateHeaders)
793     printPrivateFileHeader(o);
794   if (ExportsTrie)
795     printExportsTrie(o);
796   if (Rebase)
797     printRebaseTable(o);
798   if (Bind)
799     printBindTable(o);
800   if (LazyBind)
801     printLazyBindTable(o);
802   if (WeakBind)
803     printWeakBindTable(o);
804 }
805 
806 /// @brief Dump each object file in \a a;
807 static void DumpArchive(const Archive *a) {
808   for (Archive::child_iterator i = a->child_begin(), e = a->child_end(); i != e;
809        ++i) {
810     ErrorOr<std::unique_ptr<Binary>> ChildOrErr = i->getAsBinary();
811     if (std::error_code EC = ChildOrErr.getError()) {
812       // Ignore non-object files.
813       if (EC != object_error::invalid_file_type)
814         errs() << ToolName << ": '" << a->getFileName() << "': " << EC.message()
815                << ".\n";
816       continue;
817     }
818     if (ObjectFile *o = dyn_cast<ObjectFile>(&*ChildOrErr.get()))
819       DumpObject(o);
820     else
821       errs() << ToolName << ": '" << a->getFileName() << "': "
822               << "Unrecognized file type.\n";
823   }
824 }
825 
826 /// @brief Open file and figure out how to dump it.
827 static void DumpInput(StringRef file) {
828   // If file isn't stdin, check that it exists.
829   if (file != "-" && !sys::fs::exists(file)) {
830     errs() << ToolName << ": '" << file << "': " << "No such file\n";
831     return;
832   }
833 
834   if (MachOOpt && Disassemble) {
835     DisassembleInputMachO(file);
836     return;
837   }
838 
839   // Attempt to open the binary.
840   ErrorOr<OwningBinary<Binary>> BinaryOrErr = createBinary(file);
841   if (std::error_code EC = BinaryOrErr.getError()) {
842     errs() << ToolName << ": '" << file << "': " << EC.message() << ".\n";
843     return;
844   }
845   Binary &Binary = *BinaryOrErr.get().getBinary();
846 
847   if (Archive *a = dyn_cast<Archive>(&Binary))
848     DumpArchive(a);
849   else if (ObjectFile *o = dyn_cast<ObjectFile>(&Binary))
850     DumpObject(o);
851   else
852     errs() << ToolName << ": '" << file << "': " << "Unrecognized file type.\n";
853 }
854 
855 int main(int argc, char **argv) {
856   // Print a stack trace if we signal out.
857   sys::PrintStackTraceOnErrorSignal();
858   PrettyStackTraceProgram X(argc, argv);
859   llvm_shutdown_obj Y;  // Call llvm_shutdown() on exit.
860 
861   // Initialize targets and assembly printers/parsers.
862   llvm::InitializeAllTargetInfos();
863   llvm::InitializeAllTargetMCs();
864   llvm::InitializeAllAsmParsers();
865   llvm::InitializeAllDisassemblers();
866 
867   // Register the target printer for --version.
868   cl::AddExtraVersionPrinter(TargetRegistry::printRegisteredTargetsForVersion);
869 
870   cl::ParseCommandLineOptions(argc, argv, "llvm object file dumper\n");
871   TripleName = Triple::normalize(TripleName);
872 
873   ToolName = argv[0];
874 
875   // Defaults to a.out if no filenames specified.
876   if (InputFilenames.size() == 0)
877     InputFilenames.push_back("a.out");
878 
879   if (!Disassemble
880       && !Relocations
881       && !SectionHeaders
882       && !SectionContents
883       && !SymbolTable
884       && !UnwindInfo
885       && !PrivateHeaders
886       && !ExportsTrie
887       && !Rebase
888       && !Bind
889       && !LazyBind
890       && !WeakBind) {
891     cl::PrintHelpMessage();
892     return 2;
893   }
894 
895   std::for_each(InputFilenames.begin(), InputFilenames.end(),
896                 DumpInput);
897 
898   return 0;
899 }
900