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/MCRegisterInfo.h"
  30 #include "llvm/MC/MCSubtargetInfo.h"
  31 #include "llvm/Support/CommandLine.h"
  32 #include "llvm/Support/Debug.h"
  33 #include "llvm/Support/Format.h"
  34 #include "llvm/Support/GraphWriter.h"
  35 #include "llvm/Support/MemoryBuffer.h"
  36 #include "llvm/Support/TargetRegistry.h"
  37 #include "llvm/Support/TargetSelect.h"
  38 #include "llvm/Support/raw_ostream.h"
  39 #include "llvm/Support/system_error.h"
  40 #include <algorithm>
  41 #include <cstring>
  42 using namespace llvm;
  43 using namespace object;
  44
  45 static cl::opt<bool>
  46   CFG("cfg", cl::desc("Create a CFG for every symbol in the object file and"
  47                       "write it to a graphviz file (MachO-only)"));
  48
  49 static cl::opt<bool>
  50   UseDbg("g", cl::desc("Print line information from debug info if available"));
  51
  52 static cl::opt<std::string>
  53   DSYMFile("dsym", cl::desc("Use .dSYM file for debug info"));
  54
  55 static const Target *GetTarget(const MachOObject *MachOObj) {
  56   // Figure out the target triple.
  57   if (TripleName.empty()) {
  58     llvm::Triple TT("unknown-unknown-unknown");
  59     switch (MachOObj->getHeader().CPUType) {
  60     case llvm::MachO::CPUTypeI386:
  61       TT.setArch(Triple::ArchType(Triple::x86));
  62       break;
  63     case llvm::MachO::CPUTypeX86_64:
  64       TT.setArch(Triple::ArchType(Triple::x86_64));
  65       break;
  66     case llvm::MachO::CPUTypeARM:
  67       TT.setArch(Triple::ArchType(Triple::arm));
  68       break;
  69     case llvm::MachO::CPUTypePowerPC:
  70       TT.setArch(Triple::ArchType(Triple::ppc));
  71       break;
  72     case llvm::MachO::CPUTypePowerPC64:
  73       TT.setArch(Triple::ArchType(Triple::ppc64));
  74       break;
  75     }
  76     TripleName = TT.str();
  77   }
  78
  79   // Get the target specific parser.
  80   std::string Error;
  81   const Target *TheTarget = TargetRegistry::lookupTarget(TripleName, Error);
  82   if (TheTarget)
  83     return TheTarget;
  84
  85   errs() << "llvm-objdump: error: unable to get target for '" << TripleName
  86          << "', see --version and --triple.\n";
  87   return 0;
  88 }
  89
  90 struct SymbolSorter {
  91   bool operator()(const SymbolRef &A, const SymbolRef &B) {
  92     SymbolRef::Type AType, BType;
  93     A.getType(AType);
  94     B.getType(BType);
  95
  96     uint64_t AAddr, BAddr;
  97     if (AType != SymbolRef::ST_Function)
  98       AAddr = 0;
  99     else
 100       A.getAddress(AAddr);
 101     if (BType != SymbolRef::ST_Function)
 102       BAddr = 0;
 103     else
 104       B.getAddress(BAddr);
 105     return AAddr < BAddr;
 106   }
 107 };
 108
 109 // Print additional information about an address, if available.
 110 static void DumpAddress(uint64_t Address, ArrayRef<SectionRef> Sections,
 111                         MachOObject *MachOObj, raw_ostream &OS) {
 112   for (unsigned i = 0; i != Sections.size(); ++i) {
 113     uint64_t SectAddr = 0, SectSize = 0;
 114     Sections[i].getAddress(SectAddr);
 115     Sections[i].getSize(SectSize);
 116     uint64_t addr = SectAddr;
 117     if (SectAddr <= Address &&
 118         SectAddr + SectSize > Address) {
 119       StringRef bytes, name;
 120       Sections[i].getContents(bytes);
 121       Sections[i].getName(name);
 122       // Print constant strings.
 123       if (!name.compare("__cstring"))
 124         OS << '"' << bytes.substr(addr, bytes.find('\0', addr)) << '"';
 125       // Print constant CFStrings.
 126       if (!name.compare("__cfstring"))
 127         OS << "@\"" << bytes.substr(addr, bytes.find('\0', addr)) << '"';
 128     }
 129   }
 130 }
 131
 132 typedef std::map<uint64_t, MCFunction*> FunctionMapTy;
 133 typedef SmallVector<MCFunction, 16> FunctionListTy;
 134 static void createMCFunctionAndSaveCalls(StringRef Name,
 135                                          const MCDisassembler *DisAsm,
 136                                          MemoryObject &Object, uint64_t Start,
 137                                          uint64_t End,
 138                                          MCInstrAnalysis *InstrAnalysis,
 139                                          uint64_t Address,
 140                                          raw_ostream &DebugOut,
 141                                          FunctionMapTy &FunctionMap,
 142                                          FunctionListTy &Functions) {
 143   SmallVector<uint64_t, 16> Calls;
 144   MCFunction f =
 145     MCFunction::createFunctionFromMC(Name, DisAsm, Object, Start, End,
 146                                      InstrAnalysis, DebugOut, Calls);
 147   Functions.push_back(f);
 148   FunctionMap[Address] = &Functions.back();
 149
 150   // Add the gathered callees to the map.
 151   for (unsigned i = 0, e = Calls.size(); i != e; ++i)
 152     FunctionMap.insert(std::make_pair(Calls[i], (MCFunction*)0));
 153 }
 154
 155 // Write a graphviz file for the CFG inside an MCFunction.
 156 static void emitDOTFile(const char *FileName, const MCFunction &f,
 157                         MCInstPrinter *IP) {
 158   // Start a new dot file.
 159   std::string Error;
 160   raw_fd_ostream Out(FileName, Error);
 161   if (!Error.empty()) {
 162     errs() << "llvm-objdump: warning: " << Error << '\n';
 163     return;
 164   }
 165
 166   Out << "digraph " << f.getName() << " {\n";
 167   Out << "graph [ rankdir = \"LR\" ];\n";
 168   for (MCFunction::iterator i = f.begin(), e = f.end(); i != e; ++i) {
 169     bool hasPreds = false;
 170     // Only print blocks that have predecessors.
 171     // FIXME: Slow.
 172     for (MCFunction::iterator pi = f.begin(), pe = f.end(); pi != pe;
 173         ++pi)
 174       if (pi->second.contains(i->first)) {
 175         hasPreds = true;
 176         break;
 177       }
 178
 179     if (!hasPreds && i != f.begin())
 180       continue;
 181
 182     Out << '"' << i->first << "\" [ label=\"<a>";
 183     // Print instructions.
 184     for (unsigned ii = 0, ie = i->second.getInsts().size(); ii != ie;
 185         ++ii) {
 186       // Escape special chars and print the instruction in mnemonic form.
 187       std::string Str;
 188       raw_string_ostream OS(Str);
 189       IP->printInst(&i->second.getInsts()[ii].Inst, OS, "");
 190       Out << DOT::EscapeString(OS.str()) << '|';
 191     }
 192     Out << "<o>\" shape=\"record\" ];\n";
 193
 194     // Add edges.
 195     for (MCBasicBlock::succ_iterator si = i->second.succ_begin(),
 196         se = i->second.succ_end(); si != se; ++si)
 197       Out << i->first << ":o -> " << *si <<":a\n";
 198   }
 199   Out << "}\n";
 200 }
 201
 202 static void getSectionsAndSymbols(const macho::Header &Header,
 203                                   MachOObjectFile *MachOObj,
 204                              InMemoryStruct<macho::SymtabLoadCommand> *SymtabLC,
 205                                   std::vector<SectionRef> &Sections,
 206                                   std::vector<SymbolRef> &Symbols,
 207                                   SmallVectorImpl<uint64_t> &FoundFns) {
 208   error_code ec;
 209   for (symbol_iterator SI = MachOObj->begin_symbols(),
 210        SE = MachOObj->end_symbols(); SI != SE; SI.increment(ec))
 211     Symbols.push_back(*SI);
 212
 213   for (section_iterator SI = MachOObj->begin_sections(),
 214        SE = MachOObj->end_sections(); SI != SE; SI.increment(ec)) {
 215     SectionRef SR = *SI;
 216     StringRef SectName;
 217     SR.getName(SectName);
 218     Sections.push_back(*SI);
 219   }
 220
 221   for (unsigned i = 0; i != Header.NumLoadCommands; ++i) {
 222     const MachOObject::LoadCommandInfo &LCI =
 223        MachOObj->getObject()->getLoadCommandInfo(i);
 224     if (LCI.Command.Type == macho::LCT_FunctionStarts) {
 225       // We found a function starts segment, parse the addresses for later
 226       // consumption.
 227       InMemoryStruct<macho::LinkeditDataLoadCommand> LLC;
 228       MachOObj->getObject()->ReadLinkeditDataLoadCommand(LCI, LLC);
 229
 230       MachOObj->getObject()->ReadULEB128s(LLC->DataOffset, FoundFns);
 231     }
 232   }
 233 }
 234
 235 void llvm::DisassembleInputMachO(StringRef Filename) {
 236   OwningPtr<MemoryBuffer> Buff;
 237
 238   if (error_code ec = MemoryBuffer::getFileOrSTDIN(Filename, Buff)) {
 239     errs() << "llvm-objdump: " << Filename << ": " << ec.message() << "\n";
 240     return;
 241   }
 242
 243   OwningPtr<MachOObjectFile> MachOOF(static_cast<MachOObjectFile*>(
 244         ObjectFile::createMachOObjectFile(Buff.take())));
 245   MachOObject *MachOObj = MachOOF->getObject();
 246
 247   const Target *TheTarget = GetTarget(MachOObj);
 248   if (!TheTarget) {
 249     // GetTarget prints out stuff.
 250     return;
 251   }
 252   OwningPtr<const MCInstrInfo> InstrInfo(TheTarget->createMCInstrInfo());
 253   OwningPtr<MCInstrAnalysis>
 254     InstrAnalysis(TheTarget->createMCInstrAnalysis(InstrInfo.get()));
 255
 256   // Set up disassembler.
 257   OwningPtr<const MCAsmInfo> AsmInfo(TheTarget->createMCAsmInfo(TripleName));
 258   OwningPtr<const MCSubtargetInfo>
 259     STI(TheTarget->createMCSubtargetInfo(TripleName, "", ""));
 260   OwningPtr<const MCDisassembler> DisAsm(TheTarget->createMCDisassembler(*STI));
 261   OwningPtr<const MCRegisterInfo> MRI(TheTarget->createMCRegInfo(TripleName));
 262   int AsmPrinterVariant = AsmInfo->getAssemblerDialect();
 263   OwningPtr<MCInstPrinter>
 264     IP(TheTarget->createMCInstPrinter(AsmPrinterVariant, *AsmInfo, *InstrInfo,
 265                                       *MRI, *STI));
 266
 267   if (!InstrAnalysis || !AsmInfo || !STI || !DisAsm || !IP) {
 268     errs() << "error: couldn't initialize disassembler for target "
 269            << TripleName << '\n';
 270     return;
 271   }
 272
 273   outs() << '\n' << Filename << ":\n\n";
 274
 275   const macho::Header &Header = MachOObj->getHeader();
 276
 277   const MachOObject::LoadCommandInfo *SymtabLCI = 0;
 278   // First, find the symbol table segment.
 279   for (unsigned i = 0; i != Header.NumLoadCommands; ++i) {
 280     const MachOObject::LoadCommandInfo &LCI = MachOObj->getLoadCommandInfo(i);
 281     if (LCI.Command.Type == macho::LCT_Symtab) {
 282       SymtabLCI = &LCI;
 283       break;
 284     }
 285   }
 286
 287   // Read and register the symbol table data.
 288   InMemoryStruct<macho::SymtabLoadCommand> SymtabLC;
 289   MachOObj->ReadSymtabLoadCommand(*SymtabLCI, SymtabLC);
 290   MachOObj->RegisterStringTable(*SymtabLC);
 291
 292   std::vector<SectionRef> Sections;
 293   std::vector<SymbolRef> Symbols;
 294   SmallVector<uint64_t, 8> FoundFns;
 295
 296   getSectionsAndSymbols(Header, MachOOF.get(), &SymtabLC, Sections, Symbols,
 297                         FoundFns);
 298
 299   // Make a copy of the unsorted symbol list. FIXME: duplication
 300   std::vector<SymbolRef> UnsortedSymbols(Symbols);
 301   // Sort the symbols by address, just in case they didn't come in that way.
 302   std::sort(Symbols.begin(), Symbols.end(), SymbolSorter());
 303
 304 #ifndef NDEBUG
 305   raw_ostream &DebugOut = DebugFlag ? dbgs() : nulls();
 306 #else
 307   raw_ostream &DebugOut = nulls();
 308 #endif
 309
 310   StringRef DebugAbbrevSection, DebugInfoSection, DebugArangesSection,
 311             DebugLineSection, DebugStrSection;
 312   OwningPtr<DIContext> diContext;
 313   OwningPtr<MachOObjectFile> DSYMObj;
 314   MachOObject *DbgInfoObj = MachOObj;
 315   // Try to find debug info and set up the DIContext for it.
 316   if (UseDbg) {
 317     ArrayRef<SectionRef> DebugSections = Sections;
 318     std::vector<SectionRef> DSYMSections;
 319
 320     // A separate DSym file path was specified, parse it as a macho file,
 321     // get the sections and supply it to the section name parsing machinery.
 322     if (!DSYMFile.empty()) {
 323       OwningPtr<MemoryBuffer> Buf;
 324       if (error_code ec = MemoryBuffer::getFileOrSTDIN(DSYMFile.c_str(), Buf)) {
 325         errs() << "llvm-objdump: " << Filename << ": " << ec.message() << '\n';
 326         return;
 327       }
 328       DSYMObj.reset(static_cast<MachOObjectFile*>(
 329             ObjectFile::createMachOObjectFile(Buf.take())));
 330       const macho::Header &Header = DSYMObj->getObject()->getHeader();
 331
 332       std::vector<SymbolRef> Symbols;
 333       SmallVector<uint64_t, 8> FoundFns;
 334       getSectionsAndSymbols(Header, DSYMObj.get(), 0, DSYMSections, Symbols,
 335                             FoundFns);
 336       DebugSections = DSYMSections;
 337       DbgInfoObj = DSYMObj.get()->getObject();
 338     }
 339
 340     // Find the named debug info sections.
 341     for (unsigned SectIdx = 0; SectIdx != DebugSections.size(); SectIdx++) {
 342       StringRef SectName;
 343       if (!DebugSections[SectIdx].getName(SectName)) {
 344         if (SectName.equals("__DWARF,__debug_abbrev"))
 345           DebugSections[SectIdx].getContents(DebugAbbrevSection);
 346         else if (SectName.equals("__DWARF,__debug_info"))
 347           DebugSections[SectIdx].getContents(DebugInfoSection);
 348         else if (SectName.equals("__DWARF,__debug_aranges"))
 349           DebugSections[SectIdx].getContents(DebugArangesSection);
 350         else if (SectName.equals("__DWARF,__debug_line"))
 351           DebugSections[SectIdx].getContents(DebugLineSection);
 352         else if (SectName.equals("__DWARF,__debug_str"))
 353           DebugSections[SectIdx].getContents(DebugStrSection);
 354       }
 355     }
 356
 357     // Setup the DIContext.
 358     diContext.reset(DIContext::getDWARFContext(DbgInfoObj->isLittleEndian(),
 359                                                DebugInfoSection,
 360                                                DebugAbbrevSection,
 361                                                DebugArangesSection,
 362                                                DebugLineSection,
 363                                                DebugStrSection));
 364   }
 365
 366   FunctionMapTy FunctionMap;
 367   FunctionListTy Functions;
 368
 369   for (unsigned SectIdx = 0; SectIdx != Sections.size(); SectIdx++) {
 370     StringRef SectName;
 371     if (Sections[SectIdx].getName(SectName) ||
 372         SectName.compare("__TEXT,__text"))
 373       continue; // Skip non-text sections
 374
 375     // Insert the functions from the function starts segment into our map.
 376     uint64_t VMAddr;
 377     Sections[SectIdx].getAddress(VMAddr);
 378     for (unsigned i = 0, e = FoundFns.size(); i != e; ++i) {
 379       StringRef SectBegin;
 380       Sections[SectIdx].getContents(SectBegin);
 381       uint64_t Offset = (uint64_t)SectBegin.data();
 382       FunctionMap.insert(std::make_pair(VMAddr + FoundFns[i]-Offset,
 383                                         (MCFunction*)0));
 384     }
 385
 386     StringRef Bytes;
 387     Sections[SectIdx].getContents(Bytes);
 388     StringRefMemoryObject memoryObject(Bytes);
 389     bool symbolTableWorked = false;
 390
 391     // Parse relocations.
 392     std::vector<std::pair<uint64_t, SymbolRef> > Relocs;
 393     error_code ec;
 394     for (relocation_iterator RI = Sections[SectIdx].begin_relocations(),
 395          RE = Sections[SectIdx].end_relocations(); RI != RE; RI.increment(ec)) {
 396       uint64_t RelocOffset, SectionAddress;
 397       RI->getAddress(RelocOffset);
 398       Sections[SectIdx].getAddress(SectionAddress);
 399       RelocOffset -= SectionAddress;
 400
 401       SymbolRef RelocSym;
 402       RI->getSymbol(RelocSym);
 403
 404       Relocs.push_back(std::make_pair(RelocOffset, RelocSym));
 405     }
 406     array_pod_sort(Relocs.begin(), Relocs.end());
 407
 408     // Disassemble symbol by symbol.
 409     for (unsigned SymIdx = 0; SymIdx != Symbols.size(); SymIdx++) {
 410       StringRef SymName;
 411       Symbols[SymIdx].getName(SymName);
 412
 413       SymbolRef::Type ST;
 414       Symbols[SymIdx].getType(ST);
 415       if (ST != SymbolRef::ST_Function)
 416         continue;
 417
 418       // Make sure the symbol is defined in this section.
 419       bool containsSym = false;
 420       Sections[SectIdx].containsSymbol(Symbols[SymIdx], containsSym);
 421       if (!containsSym)
 422         continue;
 423
 424       // Start at the address of the symbol relative to the section's address.
 425       uint64_t SectionAddress = 0;
 426       uint64_t Start = 0;
 427       Sections[SectIdx].getAddress(SectionAddress);
 428       Symbols[SymIdx].getAddress(Start);
 429       Start -= SectionAddress;
 430
 431       // Stop disassembling either at the beginning of the next symbol or at
 432       // the end of the section.
 433       bool containsNextSym = false;
 434       uint64_t NextSym = 0;
 435       uint64_t NextSymIdx = SymIdx+1;
 436       while (Symbols.size() > NextSymIdx) {
 437         SymbolRef::Type NextSymType;
 438         Symbols[NextSymIdx].getType(NextSymType);
 439         if (NextSymType == SymbolRef::ST_Function) {
 440           Sections[SectIdx].containsSymbol(Symbols[NextSymIdx],
 441                                            containsNextSym);
 442           Symbols[NextSymIdx].getAddress(NextSym);
 443           NextSym -= SectionAddress;
 444           break;
 445         }
 446         ++NextSymIdx;
 447       }
 448
 449       uint64_t SectSize;
 450       Sections[SectIdx].getSize(SectSize);
 451       uint64_t End = containsNextSym ?  NextSym : SectSize;
 452       uint64_t Size;
 453
 454       symbolTableWorked = true;
 455
 456       if (!CFG) {
 457         // Normal disassembly, print addresses, bytes and mnemonic form.
 458         StringRef SymName;
 459         Symbols[SymIdx].getName(SymName);
 460
 461         outs() << SymName << ":\n";
 462         DILineInfo lastLine;
 463         for (uint64_t Index = Start; Index < End; Index += Size) {
 464           MCInst Inst;
 465
 466           if (DisAsm->getInstruction(Inst, Size, memoryObject, Index,
 467                                      DebugOut, nulls())) {
 468             uint64_t SectAddress = 0;
 469             Sections[SectIdx].getAddress(SectAddress);
 470             outs() << format("%8" PRIx64 ":\t", SectAddress + Index);
 471
 472             DumpBytes(StringRef(Bytes.data() + Index, Size));
 473             IP->printInst(&Inst, outs(), "");
 474
 475             // Print debug info.
 476             if (diContext) {
 477               DILineInfo dli =
 478                 diContext->getLineInfoForAddress(SectAddress + Index);
 479               // Print valid line info if it changed.
 480               if (dli != lastLine && dli.getLine() != 0)
 481                 outs() << "\t## " << dli.getFileName() << ':'
 482                        << dli.getLine() << ':' << dli.getColumn();
 483               lastLine = dli;
 484             }
 485             outs() << "\n";
 486           } else {
 487             errs() << "llvm-objdump: warning: invalid instruction encoding\n";
 488             if (Size == 0)
 489               Size = 1; // skip illegible bytes
 490           }
 491         }
 492       } else {
 493         // Create CFG and use it for disassembly.
 494         StringRef SymName;
 495         Symbols[SymIdx].getName(SymName);
 496         createMCFunctionAndSaveCalls(
 497             SymName, DisAsm.get(), memoryObject, Start, End,
 498             InstrAnalysis.get(), Start, DebugOut, FunctionMap, Functions);
 499       }
 500     }
 501
 502     if (CFG) {
 503       if (!symbolTableWorked) {
 504         // Reading the symbol table didn't work, create a big __TEXT symbol.
 505         uint64_t SectSize = 0, SectAddress = 0;
 506         Sections[SectIdx].getSize(SectSize);
 507         Sections[SectIdx].getAddress(SectAddress);
 508         createMCFunctionAndSaveCalls("__TEXT", DisAsm.get(), memoryObject,
 509                                      0, SectSize,
 510                                      InstrAnalysis.get(),
 511                                      SectAddress, DebugOut,
 512                                      FunctionMap, Functions);
 513       }
 514       for (std::map<uint64_t, MCFunction*>::iterator mi = FunctionMap.begin(),
 515            me = FunctionMap.end(); mi != me; ++mi)
 516         if (mi->second == 0) {
 517           // Create functions for the remaining callees we have gathered,
 518           // but we didn't find a name for them.
 519           uint64_t SectSize = 0;
 520           Sections[SectIdx].getSize(SectSize);
 521
 522           SmallVector<uint64_t, 16> Calls;
 523           MCFunction f =
 524             MCFunction::createFunctionFromMC("unknown", DisAsm.get(),
 525                                              memoryObject, mi->first,
 526                                              SectSize,
 527                                              InstrAnalysis.get(), DebugOut,
 528                                              Calls);
 529           Functions.push_back(f);
 530           mi->second = &Functions.back();
 531           for (unsigned i = 0, e = Calls.size(); i != e; ++i) {
 532             std::pair<uint64_t, MCFunction*> p(Calls[i], (MCFunction*)0);
 533             if (FunctionMap.insert(p).second)
 534               mi = FunctionMap.begin();
 535           }
 536         }
 537
 538       DenseSet<uint64_t> PrintedBlocks;
 539       for (unsigned ffi = 0, ffe = Functions.size(); ffi != ffe; ++ffi) {
 540         MCFunction &f = Functions[ffi];
 541         for (MCFunction::iterator fi = f.begin(), fe = f.end(); fi != fe; ++fi){
 542           if (!PrintedBlocks.insert(fi->first).second)
 543             continue; // We already printed this block.
 544
 545           // We assume a block has predecessors when it's the first block after
 546           // a symbol.
 547           bool hasPreds = FunctionMap.find(fi->first) != FunctionMap.end();
 548
 549           // See if this block has predecessors.
 550           // FIXME: Slow.
 551           for (MCFunction::iterator pi = f.begin(), pe = f.end(); pi != pe;
 552               ++pi)
 553             if (pi->second.contains(fi->first)) {
 554               hasPreds = true;
 555               break;
 556             }
 557
 558           uint64_t SectSize = 0, SectAddress;
 559           Sections[SectIdx].getSize(SectSize);
 560           Sections[SectIdx].getAddress(SectAddress);
 561
 562           // No predecessors, this is a data block. Print as .byte directives.
 563           if (!hasPreds) {
 564             uint64_t End = llvm::next(fi) == fe ? SectSize :
 565                                                   llvm::next(fi)->first;
 566             outs() << "# " << End-fi->first << " bytes of data:\n";
 567             for (unsigned pos = fi->first; pos != End; ++pos) {
 568               outs() << format("%8x:\t", SectAddress + pos);
 569               DumpBytes(StringRef(Bytes.data() + pos, 1));
 570               outs() << format("\t.byte 0x%02x\n", (uint8_t)Bytes[pos]);
 571             }
 572             continue;
 573           }
 574
 575           if (fi->second.contains(fi->first)) // Print a header for simple loops
 576             outs() << "# Loop begin:\n";
 577
 578           DILineInfo lastLine;
 579           // Walk over the instructions and print them.
 580           for (unsigned ii = 0, ie = fi->second.getInsts().size(); ii != ie;
 581                ++ii) {
 582             const MCDecodedInst &Inst = fi->second.getInsts()[ii];
 583
 584             // If there's a symbol at this address, print its name.
 585             if (FunctionMap.find(SectAddress + Inst.Address) !=
 586                 FunctionMap.end())
 587               outs() << FunctionMap[SectAddress + Inst.Address]-> getName()
 588                      << ":\n";
 589
 590             outs() << format("%8" PRIx64 ":\t", SectAddress + Inst.Address);
 591             DumpBytes(StringRef(Bytes.data() + Inst.Address, Inst.Size));
 592
 593             if (fi->second.contains(fi->first)) // Indent simple loops.
 594               outs() << '\t';
 595
 596             IP->printInst(&Inst.Inst, outs(), "");
 597
 598             // Look for relocations inside this instructions, if there is one
 599             // print its target and additional information if available.
 600             for (unsigned j = 0; j != Relocs.size(); ++j)
 601               if (Relocs[j].first >= SectAddress + Inst.Address &&
 602                   Relocs[j].first < SectAddress + Inst.Address + Inst.Size) {
 603                 StringRef SymName;
 604                 uint64_t Addr;
 605                 Relocs[j].second.getAddress(Addr);
 606                 Relocs[j].second.getName(SymName);
 607
 608                 outs() << "\t# " << SymName << ' ';
 609                 DumpAddress(Addr, Sections, MachOObj, outs());
 610               }
 611
 612             // If this instructions contains an address, see if we can evaluate
 613             // it and print additional information.
 614             uint64_t targ = InstrAnalysis->evaluateBranch(Inst.Inst,
 615                                                           Inst.Address,
 616                                                           Inst.Size);
 617             if (targ != -1ULL)
 618               DumpAddress(targ, Sections, MachOObj, outs());
 619
 620             // Print debug info.
 621             if (diContext) {
 622               DILineInfo dli =
 623                 diContext->getLineInfoForAddress(SectAddress + Inst.Address);
 624               // Print valid line info if it changed.
 625               if (dli != lastLine && dli.getLine() != 0)
 626                 outs() << "\t## " << dli.getFileName() << ':'
 627                        << dli.getLine() << ':' << dli.getColumn();
 628               lastLine = dli;
 629             }
 630
 631             outs() << '\n';
 632           }
 633         }
 634
 635         emitDOTFile((f.getName().str() + ".dot").c_str(), f, IP.get());
 636       }
 637     }
 638   }
 639 }