tools/llvm-objdump/MachODump.cpp

   1 //===-- MachODump.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 file implements the MachO-specific dumper for llvm-objdump.
  11 //
  12 //===----------------------------------------------------------------------===//
  13
  14 #include "llvm-objdump.h"
  15 #include "MCFunction.h"
  16 #include "llvm/Support/MachO.h"
  17 #include "llvm/Object/MachO.h"
  18 #include "llvm/ADT/OwningPtr.h"
  19 #include "llvm/ADT/Triple.h"
  20 #include "llvm/ADT/STLExtras.h"
  21 #include "llvm/DebugInfo/DIContext.h"
  22 #include "llvm/MC/MCAsmInfo.h"
  23 #include "llvm/MC/MCDisassembler.h"
  24 #include "llvm/MC/MCInst.h"
  25 #include "llvm/MC/MCInstPrinter.h"
  26 #include "llvm/MC/MCInstrAnalysis.h"
  27 #include "llvm/MC/MCInstrDesc.h"
  28 #include "llvm/MC/MCInstrInfo.h"
  29 #include "llvm/MC/MCSubtargetInfo.h"
  30 #include "llvm/Support/CommandLine.h"
  31 #include "llvm/Support/Debug.h"
  32 #include "llvm/Support/Format.h"
  33 #include "llvm/Support/GraphWriter.h"
  34 #include "llvm/Support/MemoryBuffer.h"
  35 #include "llvm/Support/TargetRegistry.h"
  36 #include "llvm/Support/TargetSelect.h"
  37 #include "llvm/Support/raw_ostream.h"
  38 #include "llvm/Support/system_error.h"
  39 #include <algorithm>
  40 #include <cstring>
  41 using namespace llvm;
  42 using namespace object;
  43
  44 static cl::opt<bool>
  45   CFG("cfg", cl::desc("Create a CFG for every symbol in the object file and"
  46                       "write it to a graphviz file (MachO-only)"));
  47
  48 static cl::opt<bool>
  49   UseDbg("g", cl::desc("Print line information from debug info if available"));
  50
  51 static cl::opt<std::string>
  52   DSYMFile("dsym", cl::desc("Use .dSYM file for debug info"));
  53
  54 static const Target *GetTarget(const MachOObject *MachOObj) {
  55   // Figure out the target triple.
  56   llvm::Triple TT("unknown-unknown-unknown");
  57   switch (MachOObj->getHeader().CPUType) {
  58   case llvm::MachO::CPUTypeI386:
  59     TT.setArch(Triple::ArchType(Triple::x86));
  60     break;
  61   case llvm::MachO::CPUTypeX86_64:
  62     TT.setArch(Triple::ArchType(Triple::x86_64));
  63     break;
  64   case llvm::MachO::CPUTypeARM:
  65     TT.setArch(Triple::ArchType(Triple::arm));
  66     break;
  67   case llvm::MachO::CPUTypePowerPC:
  68     TT.setArch(Triple::ArchType(Triple::ppc));
  69     break;
  70   case llvm::MachO::CPUTypePowerPC64:
  71     TT.setArch(Triple::ArchType(Triple::ppc64));
  72     break;
  73   }
  74
  75   TripleName = TT.str();
  76
  77   // Get the target specific parser.
  78   std::string Error;
  79   const Target *TheTarget = TargetRegistry::lookupTarget(TripleName, Error);
  80   if (TheTarget)
  81     return TheTarget;
  82
  83   errs() << "llvm-objdump: error: unable to get target for '" << TripleName
  84          << "', see --version and --triple.\n";
  85   return 0;
  86 }
  87
  88 struct SymbolSorter {
  89   bool operator()(const SymbolRef &A, const SymbolRef &B) {
  90     SymbolRef::Type AType, BType;
  91     A.getType(AType);
  92     B.getType(BType);
  93
  94     uint64_t AAddr, BAddr;
  95     if (AType != SymbolRef::ST_Function)
  96       AAddr = 0;
  97     else
  98       A.getAddress(AAddr);
  99     if (BType != SymbolRef::ST_Function)
 100       BAddr = 0;
 101     else
 102       B.getAddress(BAddr);
 103     return AAddr < BAddr;
 104   }
 105 };
 106
 107 // Print additional information about an address, if available.
 108 static void DumpAddress(uint64_t Address, ArrayRef<SectionRef> Sections,
 109                         MachOObject *MachOObj, raw_ostream &OS) {
 110   for (unsigned i = 0; i != Sections.size(); ++i) {
 111     uint64_t SectAddr = 0, SectSize = 0;
 112     Sections[i].getAddress(SectAddr);
 113     Sections[i].getSize(SectSize);
 114     uint64_t addr = SectAddr;
 115     if (SectAddr <= Address &&
 116         SectAddr + SectSize > Address) {
 117       StringRef bytes, name;
 118       Sections[i].getContents(bytes);
 119       Sections[i].getName(name);
 120       // Print constant strings.
 121       if (!name.compare("__cstring"))
 122         OS << '"' << bytes.substr(addr, bytes.find('\0', addr)) << '"';
 123       // Print constant CFStrings.
 124       if (!name.compare("__cfstring"))
 125         OS << "@\"" << bytes.substr(addr, bytes.find('\0', addr)) << '"';
 126     }
 127   }
 128 }
 129
 130 typedef std::map<uint64_t, MCFunction*> FunctionMapTy;
 131 typedef SmallVector<MCFunction, 16> FunctionListTy;
 132 static void createMCFunctionAndSaveCalls(StringRef Name,
 133                                          const MCDisassembler *DisAsm,
 134                                          MemoryObject &Object, uint64_t Start,
 135                                          uint64_t End,
 136                                          MCInstrAnalysis *InstrAnalysis,
 137                                          uint64_t Address,
 138                                          raw_ostream &DebugOut,
 139                                          FunctionMapTy &FunctionMap,
 140                                          FunctionListTy &Functions) {
 141   SmallVector<uint64_t, 16> Calls;
 142   MCFunction f =
 143     MCFunction::createFunctionFromMC(Name, DisAsm, Object, Start, End,
 144                                      InstrAnalysis, DebugOut, Calls);
 145   Functions.push_back(f);
 146   FunctionMap[Address] = &Functions.back();
 147
 148   // Add the gathered callees to the map.
 149   for (unsigned i = 0, e = Calls.size(); i != e; ++i)
 150     FunctionMap.insert(std::make_pair(Calls[i], (MCFunction*)0));
 151 }
 152
 153 // Write a graphviz file for the CFG inside an MCFunction.
 154 static void emitDOTFile(const char *FileName, const MCFunction &f,
 155                         MCInstPrinter *IP) {
 156   // Start a new dot file.
 157   std::string Error;
 158   raw_fd_ostream Out(FileName, Error);
 159   if (!Error.empty()) {
 160     errs() << "llvm-objdump: warning: " << Error << '\n';
 161     return;
 162   }
 163
 164   Out << "digraph " << f.getName() << " {\n";
 165   Out << "graph [ rankdir = \"LR\" ];\n";
 166   for (MCFunction::iterator i = f.begin(), e = f.end(); i != e; ++i) {
 167     bool hasPreds = false;
 168     // Only print blocks that have predecessors.
 169     // FIXME: Slow.
 170     for (MCFunction::iterator pi = f.begin(), pe = f.end(); pi != pe;
 171         ++pi)
 172       if (pi->second.contains(i->first)) {
 173         hasPreds = true;
 174         break;
 175       }
 176
 177     if (!hasPreds && i != f.begin())
 178       continue;
 179
 180     Out << '"' << i->first << "\" [ label=\"<a>";
 181     // Print instructions.
 182     for (unsigned ii = 0, ie = i->second.getInsts().size(); ii != ie;
 183         ++ii) {
 184       // Escape special chars and print the instruction in mnemonic form.
 185       std::string Str;
 186       raw_string_ostream OS(Str);
 187       IP->printInst(&i->second.getInsts()[ii].Inst, OS, "");
 188       Out << DOT::EscapeString(OS.str()) << '|';
 189     }
 190     Out << "<o>\" shape=\"record\" ];\n";
 191
 192     // Add edges.
 193     for (MCBasicBlock::succ_iterator si = i->second.succ_begin(),
 194         se = i->second.succ_end(); si != se; ++si)
 195       Out << i->first << ":o -> " << *si <<":a\n";
 196   }
 197   Out << "}\n";
 198 }
 199
 200 static void getSectionsAndSymbols(const macho::Header &Header,
 201                                   MachOObjectFile *MachOObj,
 202                              InMemoryStruct<macho::SymtabLoadCommand> *SymtabLC,
 203                                   std::vector<SectionRef> &Sections,
 204                                   std::vector<SymbolRef> &Symbols,
 205                                   SmallVectorImpl<uint64_t> &FoundFns) {
 206   error_code ec;
 207   for (symbol_iterator SI = MachOObj->begin_symbols(),
 208        SE = MachOObj->end_symbols(); SI != SE; SI.increment(ec))
 209     Symbols.push_back(*SI);
 210
 211   for (section_iterator SI = MachOObj->begin_sections(),
 212        SE = MachOObj->end_sections(); SI != SE; SI.increment(ec)) {
 213     SectionRef SR = *SI;
 214     StringRef SectName;
 215     SR.getName(SectName);
 216     Sections.push_back(*SI);
 217   }
 218
 219   for (unsigned i = 0; i != Header.NumLoadCommands; ++i) {
 220     const MachOObject::LoadCommandInfo &LCI =
 221        MachOObj->getObject()->getLoadCommandInfo(i);
 222     if (LCI.Command.Type == macho::LCT_FunctionStarts) {
 223       // We found a function starts segment, parse the addresses for later
 224       // consumption.
 225       InMemoryStruct<macho::LinkeditDataLoadCommand> LLC;
 226       MachOObj->getObject()->ReadLinkeditDataLoadCommand(LCI, LLC);
 227
 228       MachOObj->getObject()->ReadULEB128s(LLC->DataOffset, FoundFns);
 229     }
 230   }
 231 }
 232
 233 void llvm::DisassembleInputMachO(StringRef Filename) {
 234   OwningPtr<MemoryBuffer> Buff;
 235
 236   if (error_code ec = MemoryBuffer::getFileOrSTDIN(Filename, Buff)) {
 237     errs() << "llvm-objdump: " << Filename << ": " << ec.message() << "\n";
 238     return;
 239   }
 240
 241   OwningPtr<MachOObjectFile> MachOOF(static_cast<MachOObjectFile*>(
 242         ObjectFile::createMachOObjectFile(Buff.take())));
 243   MachOObject *MachOObj = MachOOF->getObject();
 244
 245   const Target *TheTarget = GetTarget(MachOObj);
 246   if (!TheTarget) {
 247     // GetTarget prints out stuff.
 248     return;
 249   }
 250   OwningPtr<const MCInstrInfo> InstrInfo(TheTarget->createMCInstrInfo());
 251   OwningPtr<MCInstrAnalysis>
 252     InstrAnalysis(TheTarget->createMCInstrAnalysis(InstrInfo.get()));
 253
 254   // Set up disassembler.
 255   OwningPtr<const MCAsmInfo> AsmInfo(TheTarget->createMCAsmInfo(TripleName));
 256   OwningPtr<const MCSubtargetInfo>
 257     STI(TheTarget->createMCSubtargetInfo(TripleName, "", ""));
 258   OwningPtr<const MCDisassembler> DisAsm(TheTarget->createMCDisassembler(*STI));
 259   int AsmPrinterVariant = AsmInfo->getAssemblerDialect();
 260   OwningPtr<MCInstPrinter> IP(TheTarget->createMCInstPrinter(
 261                               AsmPrinterVariant, *AsmInfo, *STI));
 262
 263   if (!InstrAnalysis || !AsmInfo || !STI || !DisAsm || !IP) {
 264     errs() << "error: couldn't initialize disassembler for target "
 265            << TripleName << '\n';
 266     return;
 267   }
 268
 269   outs() << '\n' << Filename << ":\n\n";
 270
 271   const macho::Header &Header = MachOObj->getHeader();
 272
 273   const MachOObject::LoadCommandInfo *SymtabLCI = 0;
 274   // First, find the symbol table segment.
 275   for (unsigned i = 0; i != Header.NumLoadCommands; ++i) {
 276     const MachOObject::LoadCommandInfo &LCI = MachOObj->getLoadCommandInfo(i);
 277     if (LCI.Command.Type == macho::LCT_Symtab) {
 278       SymtabLCI = &LCI;
 279       break;
 280     }
 281   }
 282
 283   // Read and register the symbol table data.
 284   InMemoryStruct<macho::SymtabLoadCommand> SymtabLC;
 285   MachOObj->ReadSymtabLoadCommand(*SymtabLCI, SymtabLC);
 286   MachOObj->RegisterStringTable(*SymtabLC);
 287
 288   std::vector<SectionRef> Sections;
 289   std::vector<SymbolRef> Symbols;
 290   SmallVector<uint64_t, 8> FoundFns;
 291
 292   getSectionsAndSymbols(Header, MachOOF.get(), &SymtabLC, Sections, Symbols,
 293                         FoundFns);
 294
 295   // Make a copy of the unsorted symbol list. FIXME: duplication
 296   std::vector<SymbolRef> UnsortedSymbols(Symbols);
 297   // Sort the symbols by address, just in case they didn't come in that way.
 298   std::sort(Symbols.begin(), Symbols.end(), SymbolSorter());
 299
 300 #ifndef NDEBUG
 301   raw_ostream &DebugOut = DebugFlag ? dbgs() : nulls();
 302 #else
 303   raw_ostream &DebugOut = nulls();
 304 #endif
 305
 306   StringRef DebugAbbrevSection, DebugInfoSection, DebugArangesSection,
 307             DebugLineSection, DebugStrSection;
 308   OwningPtr<DIContext> diContext;
 309   OwningPtr<MachOObjectFile> DSYMObj;
 310   MachOObject *DbgInfoObj = MachOObj;
 311   // Try to find debug info and set up the DIContext for it.
 312   if (UseDbg) {
 313     ArrayRef<SectionRef> DebugSections = Sections;
 314     std::vector<SectionRef> DSYMSections;
 315
 316     // A separate DSym file path was specified, parse it as a macho file,
 317     // get the sections and supply it to the section name parsing machinery.
 318     if (!DSYMFile.empty()) {
 319       OwningPtr<MemoryBuffer> Buf;
 320       if (error_code ec = MemoryBuffer::getFileOrSTDIN(DSYMFile.c_str(), Buf)) {
 321         errs() << "llvm-objdump: " << Filename << ": " << ec.message() << '\n';
 322         return;
 323       }
 324       DSYMObj.reset(static_cast<MachOObjectFile*>(
 325             ObjectFile::createMachOObjectFile(Buf.take())));
 326       const macho::Header &Header = DSYMObj->getObject()->getHeader();
 327
 328       std::vector<SymbolRef> Symbols;
 329       SmallVector<uint64_t, 8> FoundFns;
 330       getSectionsAndSymbols(Header, DSYMObj.get(), 0, DSYMSections, Symbols,
 331                             FoundFns);
 332       DebugSections = DSYMSections;
 333       DbgInfoObj = DSYMObj.get()->getObject();
 334     }
 335
 336     // Find the named debug info sections.
 337     for (unsigned SectIdx = 0; SectIdx != DebugSections.size(); SectIdx++) {
 338       StringRef SectName;
 339       if (!DebugSections[SectIdx].getName(SectName)) {
 340         if (SectName.equals("__DWARF,__debug_abbrev"))
 341           DebugSections[SectIdx].getContents(DebugAbbrevSection);
 342         else if (SectName.equals("__DWARF,__debug_info"))
 343           DebugSections[SectIdx].getContents(DebugInfoSection);
 344         else if (SectName.equals("__DWARF,__debug_aranges"))
 345           DebugSections[SectIdx].getContents(DebugArangesSection);
 346         else if (SectName.equals("__DWARF,__debug_line"))
 347           DebugSections[SectIdx].getContents(DebugLineSection);
 348         else if (SectName.equals("__DWARF,__debug_str"))
 349           DebugSections[SectIdx].getContents(DebugStrSection);
 350       }
 351     }
 352
 353     // Setup the DIContext.
 354     diContext.reset(DIContext::getDWARFContext(DbgInfoObj->isLittleEndian(),
 355                                                DebugInfoSection,
 356                                                DebugAbbrevSection,
 357                                                DebugArangesSection,
 358                                                DebugLineSection,
 359                                                DebugStrSection));
 360   }
 361
 362   FunctionMapTy FunctionMap;
 363   FunctionListTy Functions;
 364
 365   for (unsigned SectIdx = 0; SectIdx != Sections.size(); SectIdx++) {
 366     StringRef SectName;
 367     if (Sections[SectIdx].getName(SectName) ||
 368         SectName.compare("__TEXT,__text"))
 369       continue; // Skip non-text sections
 370
 371     // Insert the functions from the function starts segment into our map.
 372     uint64_t VMAddr;
 373     Sections[SectIdx].getAddress(VMAddr);
 374     for (unsigned i = 0, e = FoundFns.size(); i != e; ++i) {
 375       StringRef SectBegin;
 376       Sections[SectIdx].getContents(SectBegin);
 377       uint64_t Offset = (uint64_t)SectBegin.data();
 378       FunctionMap.insert(std::make_pair(VMAddr + FoundFns[i]-Offset,
 379                                         (MCFunction*)0));
 380     }
 381
 382     StringRef Bytes;
 383     Sections[SectIdx].getContents(Bytes);
 384     StringRefMemoryObject memoryObject(Bytes);
 385     bool symbolTableWorked = false;
 386
 387     // Parse relocations.
 388     std::vector<std::pair<uint64_t, SymbolRef> > Relocs;
 389     error_code ec;
 390     for (relocation_iterator RI = Sections[SectIdx].begin_relocations(),
 391          RE = Sections[SectIdx].end_relocations(); RI != RE; RI.increment(ec)) {
 392       uint64_t RelocOffset, SectionAddress;
 393       RI->getAddress(RelocOffset);
 394       Sections[SectIdx].getAddress(SectionAddress);
 395       RelocOffset -= SectionAddress;
 396
 397       SymbolRef RelocSym;
 398       RI->getSymbol(RelocSym);
 399
 400       Relocs.push_back(std::make_pair(RelocOffset, RelocSym));
 401     }
 402     array_pod_sort(Relocs.begin(), Relocs.end());
 403
 404     // Disassemble symbol by symbol.
 405     for (unsigned SymIdx = 0; SymIdx != Symbols.size(); SymIdx++) {
 406       StringRef SymName;
 407       Symbols[SymIdx].getName(SymName);
 408
 409       SymbolRef::Type ST;
 410       Symbols[SymIdx].getType(ST);
 411       if (ST != SymbolRef::ST_Function)
 412         continue;
 413
 414       // Make sure the symbol is defined in this section.
 415       bool containsSym = false;
 416       Sections[SectIdx].containsSymbol(Symbols[SymIdx], containsSym);
 417       if (!containsSym)
 418         continue;
 419
 420       // Start at the address of the symbol relative to the section's address.
 421       uint64_t Start = 0;
 422       Symbols[SymIdx].getOffset(Start);
 423
 424       // Stop disassembling either at the beginning of the next symbol or at
 425       // the end of the section.
 426       bool containsNextSym = true;
 427       uint64_t NextSym = 0;
 428       uint64_t NextSymIdx = SymIdx+1;
 429       while (Symbols.size() > NextSymIdx) {
 430         SymbolRef::Type NextSymType;
 431         Symbols[NextSymIdx].getType(NextSymType);
 432         if (NextSymType == SymbolRef::ST_Function) {
 433           Sections[SectIdx].containsSymbol(Symbols[NextSymIdx],
 434                                            containsNextSym);
 435           Symbols[NextSymIdx].getOffset(NextSym);
 436           break;
 437         }
 438         ++NextSymIdx;
 439       }
 440
 441       uint64_t SectSize;
 442       Sections[SectIdx].getSize(SectSize);
 443       uint64_t End = containsNextSym ?  NextSym : SectSize;
 444       uint64_t Size;
 445
 446       symbolTableWorked = true;
 447
 448       if (!CFG) {
 449         // Normal disassembly, print addresses, bytes and mnemonic form.
 450         StringRef SymName;
 451         Symbols[SymIdx].getName(SymName);
 452
 453         outs() << SymName << ":\n";
 454         DILineInfo lastLine;
 455         for (uint64_t Index = Start; Index < End; Index += Size) {
 456           MCInst Inst;
 457
 458           if (DisAsm->getInstruction(Inst, Size, memoryObject, Index,
 459                                      DebugOut, nulls())) {
 460             uint64_t SectAddress = 0;
 461             Sections[SectIdx].getAddress(SectAddress);
 462             outs() << format("%8" PRIx64 ":\t", SectAddress + Index);
 463
 464             DumpBytes(StringRef(Bytes.data() + Index, Size));
 465             IP->printInst(&Inst, outs(), "");
 466
 467             // Print debug info.
 468             if (diContext) {
 469               DILineInfo dli =
 470                 diContext->getLineInfoForAddress(SectAddress + Index);
 471               // Print valid line info if it changed.
 472               if (dli != lastLine && dli.getLine() != 0)
 473                 outs() << "\t## " << dli.getFileName() << ':'
 474                        << dli.getLine() << ':' << dli.getColumn();
 475               lastLine = dli;
 476             }
 477             outs() << "\n";
 478           } else {
 479             errs() << "llvm-objdump: warning: invalid instruction encoding\n";
 480             if (Size == 0)
 481               Size = 1; // skip illegible bytes
 482           }
 483         }
 484       } else {
 485         // Create CFG and use it for disassembly.
 486         StringRef SymName;
 487         Symbols[SymIdx].getName(SymName);
 488         createMCFunctionAndSaveCalls(
 489             SymName, DisAsm.get(), memoryObject, Start, End,
 490             InstrAnalysis.get(), Start, DebugOut, FunctionMap, Functions);
 491       }
 492     }
 493
 494     if (CFG) {
 495       if (!symbolTableWorked) {
 496         // Reading the symbol table didn't work, create a big __TEXT symbol.
 497         uint64_t SectSize = 0, SectAddress = 0;
 498         Sections[SectIdx].getSize(SectSize);
 499         Sections[SectIdx].getAddress(SectAddress);
 500         createMCFunctionAndSaveCalls("__TEXT", DisAsm.get(), memoryObject,
 501                                      0, SectSize,
 502                                      InstrAnalysis.get(),
 503                                      SectAddress, DebugOut,
 504                                      FunctionMap, Functions);
 505       }
 506       for (std::map<uint64_t, MCFunction*>::iterator mi = FunctionMap.begin(),
 507            me = FunctionMap.end(); mi != me; ++mi)
 508         if (mi->second == 0) {
 509           // Create functions for the remaining callees we have gathered,
 510           // but we didn't find a name for them.
 511           uint64_t SectSize = 0;
 512           Sections[SectIdx].getSize(SectSize);
 513
 514           SmallVector<uint64_t, 16> Calls;
 515           MCFunction f =
 516             MCFunction::createFunctionFromMC("unknown", DisAsm.get(),
 517                                              memoryObject, mi->first,
 518                                              SectSize,
 519                                              InstrAnalysis.get(), DebugOut,
 520                                              Calls);
 521           Functions.push_back(f);
 522           mi->second = &Functions.back();
 523           for (unsigned i = 0, e = Calls.size(); i != e; ++i) {
 524             std::pair<uint64_t, MCFunction*> p(Calls[i], (MCFunction*)0);
 525             if (FunctionMap.insert(p).second)
 526               mi = FunctionMap.begin();
 527           }
 528         }
 529
 530       DenseSet<uint64_t> PrintedBlocks;
 531       for (unsigned ffi = 0, ffe = Functions.size(); ffi != ffe; ++ffi) {
 532         MCFunction &f = Functions[ffi];
 533         for (MCFunction::iterator fi = f.begin(), fe = f.end(); fi != fe; ++fi){
 534           if (!PrintedBlocks.insert(fi->first).second)
 535             continue; // We already printed this block.
 536
 537           // We assume a block has predecessors when it's the first block after
 538           // a symbol.
 539           bool hasPreds = FunctionMap.find(fi->first) != FunctionMap.end();
 540
 541           // See if this block has predecessors.
 542           // FIXME: Slow.
 543           for (MCFunction::iterator pi = f.begin(), pe = f.end(); pi != pe;
 544               ++pi)
 545             if (pi->second.contains(fi->first)) {
 546               hasPreds = true;
 547               break;
 548             }
 549
 550           uint64_t SectSize = 0, SectAddress;
 551           Sections[SectIdx].getSize(SectSize);
 552           Sections[SectIdx].getAddress(SectAddress);
 553
 554           // No predecessors, this is a data block. Print as .byte directives.
 555           if (!hasPreds) {
 556             uint64_t End = llvm::next(fi) == fe ? SectSize :
 557                                                   llvm::next(fi)->first;
 558             outs() << "# " << End-fi->first << " bytes of data:\n";
 559             for (unsigned pos = fi->first; pos != End; ++pos) {
 560               outs() << format("%8x:\t", SectAddress + pos);
 561               DumpBytes(StringRef(Bytes.data() + pos, 1));
 562               outs() << format("\t.byte 0x%02x\n", (uint8_t)Bytes[pos]);
 563             }
 564             continue;
 565           }
 566
 567           if (fi->second.contains(fi->first)) // Print a header for simple loops
 568             outs() << "# Loop begin:\n";
 569
 570           DILineInfo lastLine;
 571           // Walk over the instructions and print them.
 572           for (unsigned ii = 0, ie = fi->second.getInsts().size(); ii != ie;
 573                ++ii) {
 574             const MCDecodedInst &Inst = fi->second.getInsts()[ii];
 575
 576             // If there's a symbol at this address, print its name.
 577             if (FunctionMap.find(SectAddress + Inst.Address) !=
 578                 FunctionMap.end())
 579               outs() << FunctionMap[SectAddress + Inst.Address]-> getName()
 580                      << ":\n";
 581
 582             outs() << format("%8" PRIx64 ":\t", SectAddress + Inst.Address);
 583             DumpBytes(StringRef(Bytes.data() + Inst.Address, Inst.Size));
 584
 585             if (fi->second.contains(fi->first)) // Indent simple loops.
 586               outs() << '\t';
 587
 588             IP->printInst(&Inst.Inst, outs(), "");
 589
 590             // Look for relocations inside this instructions, if there is one
 591             // print its target and additional information if available.
 592             for (unsigned j = 0; j != Relocs.size(); ++j)
 593               if (Relocs[j].first >= SectAddress + Inst.Address &&
 594                   Relocs[j].first < SectAddress + Inst.Address + Inst.Size) {
 595                 StringRef SymName;
 596                 uint64_t Addr;
 597                 Relocs[j].second.getAddress(Addr);
 598                 Relocs[j].second.getName(SymName);
 599
 600                 outs() << "\t# " << SymName << ' ';
 601                 DumpAddress(Addr, Sections, MachOObj, outs());
 602               }
 603
 604             // If this instructions contains an address, see if we can evaluate
 605             // it and print additional information.
 606             uint64_t targ = InstrAnalysis->evaluateBranch(Inst.Inst,
 607                                                           Inst.Address,
 608                                                           Inst.Size);
 609             if (targ != -1ULL)
 610               DumpAddress(targ, Sections, MachOObj, outs());
 611
 612             // Print debug info.
 613             if (diContext) {
 614               DILineInfo dli =
 615                 diContext->getLineInfoForAddress(SectAddress + Inst.Address);
 616               // Print valid line info if it changed.
 617               if (dli != lastLine && dli.getLine() != 0)
 618                 outs() << "\t## " << dli.getFileName() << ':'
 619                        << dli.getLine() << ':' << dli.getColumn();
 620               lastLine = dli;
 621             }
 622
 623             outs() << '\n';
 624           }
 625         }
 626
 627         emitDOTFile((f.getName().str() + ".dot").c_str(), f, IP.get());
 628       }
 629     }
 630   }
 631 }