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      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/ADT/OwningPtr.h"
     17 #include "llvm/ADT/STLExtras.h"
     18 #include "llvm/ADT/Triple.h"
     19 #include "llvm/DebugInfo/DIContext.h"
     20 #include "llvm/MC/MCAsmInfo.h"
     21 #include "llvm/MC/MCDisassembler.h"
     22 #include "llvm/MC/MCInst.h"
     23 #include "llvm/MC/MCInstPrinter.h"
     24 #include "llvm/MC/MCInstrAnalysis.h"
     25 #include "llvm/MC/MCInstrDesc.h"
     26 #include "llvm/MC/MCInstrInfo.h"
     27 #include "llvm/MC/MCRegisterInfo.h"
     28 #include "llvm/MC/MCSubtargetInfo.h"
     29 #include "llvm/Object/MachO.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/MachO.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   if (SymtabLCI) {
    290     MachOObj->ReadSymtabLoadCommand(*SymtabLCI, SymtabLC);
    291     MachOObj->RegisterStringTable(*SymtabLC);
    292   }
    293 
    294   std::vector<SectionRef> Sections;
    295   std::vector<SymbolRef> Symbols;
    296   SmallVector<uint64_t, 8> FoundFns;
    297 
    298   getSectionsAndSymbols(Header, MachOOF.get(), &SymtabLC, Sections, Symbols,
    299                         FoundFns);
    300 
    301   // Make a copy of the unsorted symbol list. FIXME: duplication
    302   std::vector<SymbolRef> UnsortedSymbols(Symbols);
    303   // Sort the symbols by address, just in case they didn't come in that way.
    304   std::sort(Symbols.begin(), Symbols.end(), SymbolSorter());
    305 
    306 #ifndef NDEBUG
    307   raw_ostream &DebugOut = DebugFlag ? dbgs() : nulls();
    308 #else
    309   raw_ostream &DebugOut = nulls();
    310 #endif
    311 
    312   OwningPtr<DIContext> diContext;
    313   ObjectFile *DbgObj = MachOOF.get();
    314   // Try to find debug info and set up the DIContext for it.
    315   if (UseDbg) {
    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       DbgObj = ObjectFile::createMachOObjectFile(Buf.take());
    325     }
    326 
    327     // Setup the DIContext
    328     diContext.reset(DIContext::getDWARFContext(DbgObj));
    329   }
    330 
    331   FunctionMapTy FunctionMap;
    332   FunctionListTy Functions;
    333 
    334   for (unsigned SectIdx = 0; SectIdx != Sections.size(); SectIdx++) {
    335     StringRef SectName;
    336     if (Sections[SectIdx].getName(SectName) ||
    337         SectName != "__text")
    338       continue; // Skip non-text sections
    339 
    340     StringRef SegmentName;
    341     DataRefImpl DR = Sections[SectIdx].getRawDataRefImpl();
    342     if (MachOOF->getSectionFinalSegmentName(DR, SegmentName) ||
    343         SegmentName != "__TEXT")
    344       continue;
    345 
    346     // Insert the functions from the function starts segment into our map.
    347     uint64_t VMAddr;
    348     Sections[SectIdx].getAddress(VMAddr);
    349     for (unsigned i = 0, e = FoundFns.size(); i != e; ++i) {
    350       StringRef SectBegin;
    351       Sections[SectIdx].getContents(SectBegin);
    352       uint64_t Offset = (uint64_t)SectBegin.data();
    353       FunctionMap.insert(std::make_pair(VMAddr + FoundFns[i]-Offset,
    354                                         (MCFunction*)0));
    355     }
    356 
    357     StringRef Bytes;
    358     Sections[SectIdx].getContents(Bytes);
    359     StringRefMemoryObject memoryObject(Bytes);
    360     bool symbolTableWorked = false;
    361 
    362     // Parse relocations.
    363     std::vector<std::pair<uint64_t, SymbolRef> > Relocs;
    364     error_code ec;
    365     for (relocation_iterator RI = Sections[SectIdx].begin_relocations(),
    366          RE = Sections[SectIdx].end_relocations(); RI != RE; RI.increment(ec)) {
    367       uint64_t RelocOffset, SectionAddress;
    368       RI->getAddress(RelocOffset);
    369       Sections[SectIdx].getAddress(SectionAddress);
    370       RelocOffset -= SectionAddress;
    371 
    372       SymbolRef RelocSym;
    373       RI->getSymbol(RelocSym);
    374 
    375       Relocs.push_back(std::make_pair(RelocOffset, RelocSym));
    376     }
    377     array_pod_sort(Relocs.begin(), Relocs.end());
    378 
    379     // Disassemble symbol by symbol.
    380     for (unsigned SymIdx = 0; SymIdx != Symbols.size(); SymIdx++) {
    381       StringRef SymName;
    382       Symbols[SymIdx].getName(SymName);
    383 
    384       SymbolRef::Type ST;
    385       Symbols[SymIdx].getType(ST);
    386       if (ST != SymbolRef::ST_Function)
    387         continue;
    388 
    389       // Make sure the symbol is defined in this section.
    390       bool containsSym = false;
    391       Sections[SectIdx].containsSymbol(Symbols[SymIdx], containsSym);
    392       if (!containsSym)
    393         continue;
    394 
    395       // Start at the address of the symbol relative to the section's address.
    396       uint64_t SectionAddress = 0;
    397       uint64_t Start = 0;
    398       Sections[SectIdx].getAddress(SectionAddress);
    399       Symbols[SymIdx].getAddress(Start);
    400       Start -= SectionAddress;
    401 
    402       // Stop disassembling either at the beginning of the next symbol or at
    403       // the end of the section.
    404       bool containsNextSym = false;
    405       uint64_t NextSym = 0;
    406       uint64_t NextSymIdx = SymIdx+1;
    407       while (Symbols.size() > NextSymIdx) {
    408         SymbolRef::Type NextSymType;
    409         Symbols[NextSymIdx].getType(NextSymType);
    410         if (NextSymType == SymbolRef::ST_Function) {
    411           Sections[SectIdx].containsSymbol(Symbols[NextSymIdx],
    412                                            containsNextSym);
    413           Symbols[NextSymIdx].getAddress(NextSym);
    414           NextSym -= SectionAddress;
    415           break;
    416         }
    417         ++NextSymIdx;
    418       }
    419 
    420       uint64_t SectSize;
    421       Sections[SectIdx].getSize(SectSize);
    422       uint64_t End = containsNextSym ?  NextSym : SectSize;
    423       uint64_t Size;
    424 
    425       symbolTableWorked = true;
    426 
    427       if (!CFG) {
    428         // Normal disassembly, print addresses, bytes and mnemonic form.
    429         StringRef SymName;
    430         Symbols[SymIdx].getName(SymName);
    431 
    432         outs() << SymName << ":\n";
    433         DILineInfo lastLine;
    434         for (uint64_t Index = Start; Index < End; Index += Size) {
    435           MCInst Inst;
    436 
    437           if (DisAsm->getInstruction(Inst, Size, memoryObject, Index,
    438                                      DebugOut, nulls())) {
    439             uint64_t SectAddress = 0;
    440             Sections[SectIdx].getAddress(SectAddress);
    441             outs() << format("%8" PRIx64 ":\t", SectAddress + Index);
    442 
    443             DumpBytes(StringRef(Bytes.data() + Index, Size));
    444             IP->printInst(&Inst, outs(), "");
    445 
    446             // Print debug info.
    447             if (diContext) {
    448               DILineInfo dli =
    449                 diContext->getLineInfoForAddress(SectAddress + Index);
    450               // Print valid line info if it changed.
    451               if (dli != lastLine && dli.getLine() != 0)
    452                 outs() << "\t## " << dli.getFileName() << ':'
    453                        << dli.getLine() << ':' << dli.getColumn();
    454               lastLine = dli;
    455             }
    456             outs() << "\n";
    457           } else {
    458             errs() << "llvm-objdump: warning: invalid instruction encoding\n";
    459             if (Size == 0)
    460               Size = 1; // skip illegible bytes
    461           }
    462         }
    463       } else {
    464         // Create CFG and use it for disassembly.
    465         StringRef SymName;
    466         Symbols[SymIdx].getName(SymName);
    467         createMCFunctionAndSaveCalls(
    468             SymName, DisAsm.get(), memoryObject, Start, End,
    469             InstrAnalysis.get(), Start, DebugOut, FunctionMap, Functions);
    470       }
    471     }
    472     if (!CFG && !symbolTableWorked) {
    473       // Reading the symbol table didn't work, disassemble the whole section.
    474       uint64_t SectAddress;
    475       Sections[SectIdx].getAddress(SectAddress);
    476       uint64_t SectSize;
    477       Sections[SectIdx].getSize(SectSize);
    478       uint64_t InstSize;
    479       for (uint64_t Index = 0; Index < SectSize; Index += InstSize) {
    480         MCInst Inst;
    481 
    482         if (DisAsm->getInstruction(Inst, InstSize, memoryObject, Index,
    483                                    DebugOut, nulls())) {
    484           outs() << format("%8" PRIx64 ":\t", SectAddress + Index);
    485           DumpBytes(StringRef(Bytes.data() + Index, InstSize));
    486           IP->printInst(&Inst, outs(), "");
    487           outs() << "\n";
    488         } else {
    489           errs() << "llvm-objdump: warning: invalid instruction encoding\n";
    490           if (InstSize == 0)
    491             InstSize = 1; // skip illegible bytes
    492         }
    493       }
    494     }
    495 
    496     if (CFG) {
    497       if (!symbolTableWorked) {
    498         // Reading the symbol table didn't work, create a big __TEXT symbol.
    499         uint64_t SectSize = 0, SectAddress = 0;
    500         Sections[SectIdx].getSize(SectSize);
    501         Sections[SectIdx].getAddress(SectAddress);
    502         createMCFunctionAndSaveCalls("__TEXT", DisAsm.get(), memoryObject,
    503                                      0, SectSize,
    504                                      InstrAnalysis.get(),
    505                                      SectAddress, DebugOut,
    506                                      FunctionMap, Functions);
    507       }
    508       for (std::map<uint64_t, MCFunction*>::iterator mi = FunctionMap.begin(),
    509            me = FunctionMap.end(); mi != me; ++mi)
    510         if (mi->second == 0) {
    511           // Create functions for the remaining callees we have gathered,
    512           // but we didn't find a name for them.
    513           uint64_t SectSize = 0;
    514           Sections[SectIdx].getSize(SectSize);
    515 
    516           SmallVector<uint64_t, 16> Calls;
    517           MCFunction f =
    518             MCFunction::createFunctionFromMC("unknown", DisAsm.get(),
    519                                              memoryObject, mi->first,
    520                                              SectSize,
    521                                              InstrAnalysis.get(), DebugOut,
    522                                              Calls);
    523           Functions.push_back(f);
    524           mi->second = &Functions.back();
    525           for (unsigned i = 0, e = Calls.size(); i != e; ++i) {
    526             std::pair<uint64_t, MCFunction*> p(Calls[i], (MCFunction*)0);
    527             if (FunctionMap.insert(p).second)
    528               mi = FunctionMap.begin();
    529           }
    530         }
    531 
    532       DenseSet<uint64_t> PrintedBlocks;
    533       for (unsigned ffi = 0, ffe = Functions.size(); ffi != ffe; ++ffi) {
    534         MCFunction &f = Functions[ffi];
    535         for (MCFunction::iterator fi = f.begin(), fe = f.end(); fi != fe; ++fi){
    536           if (!PrintedBlocks.insert(fi->first).second)
    537             continue; // We already printed this block.
    538 
    539           // We assume a block has predecessors when it's the first block after
    540           // a symbol.
    541           bool hasPreds = FunctionMap.find(fi->first) != FunctionMap.end();
    542 
    543           // See if this block has predecessors.
    544           // FIXME: Slow.
    545           for (MCFunction::iterator pi = f.begin(), pe = f.end(); pi != pe;
    546               ++pi)
    547             if (pi->second.contains(fi->first)) {
    548               hasPreds = true;
    549               break;
    550             }
    551 
    552           uint64_t SectSize = 0, SectAddress;
    553           Sections[SectIdx].getSize(SectSize);
    554           Sections[SectIdx].getAddress(SectAddress);
    555 
    556           // No predecessors, this is a data block. Print as .byte directives.
    557           if (!hasPreds) {
    558             uint64_t End = llvm::next(fi) == fe ? SectSize :
    559                                                   llvm::next(fi)->first;
    560             outs() << "# " << End-fi->first << " bytes of data:\n";
    561             for (unsigned pos = fi->first; pos != End; ++pos) {
    562               outs() << format("%8x:\t", SectAddress + pos);
    563               DumpBytes(StringRef(Bytes.data() + pos, 1));
    564               outs() << format("\t.byte 0x%02x\n", (uint8_t)Bytes[pos]);
    565             }
    566             continue;
    567           }
    568 
    569           if (fi->second.contains(fi->first)) // Print a header for simple loops
    570             outs() << "# Loop begin:\n";
    571 
    572           DILineInfo lastLine;
    573           // Walk over the instructions and print them.
    574           for (unsigned ii = 0, ie = fi->second.getInsts().size(); ii != ie;
    575                ++ii) {
    576             const MCDecodedInst &Inst = fi->second.getInsts()[ii];
    577 
    578             // If there's a symbol at this address, print its name.
    579             if (FunctionMap.find(SectAddress + Inst.Address) !=
    580                 FunctionMap.end())
    581               outs() << FunctionMap[SectAddress + Inst.Address]-> getName()
    582                      << ":\n";
    583 
    584             outs() << format("%8" PRIx64 ":\t", SectAddress + Inst.Address);
    585             DumpBytes(StringRef(Bytes.data() + Inst.Address, Inst.Size));
    586 
    587             if (fi->second.contains(fi->first)) // Indent simple loops.
    588               outs() << '\t';
    589 
    590             IP->printInst(&Inst.Inst, outs(), "");
    591 
    592             // Look for relocations inside this instructions, if there is one
    593             // print its target and additional information if available.
    594             for (unsigned j = 0; j != Relocs.size(); ++j)
    595               if (Relocs[j].first >= SectAddress + Inst.Address &&
    596                   Relocs[j].first < SectAddress + Inst.Address + Inst.Size) {
    597                 StringRef SymName;
    598                 uint64_t Addr;
    599                 Relocs[j].second.getAddress(Addr);
    600                 Relocs[j].second.getName(SymName);
    601 
    602                 outs() << "\t# " << SymName << ' ';
    603                 DumpAddress(Addr, Sections, MachOObj, outs());
    604               }
    605 
    606             // If this instructions contains an address, see if we can evaluate
    607             // it and print additional information.
    608             uint64_t targ = InstrAnalysis->evaluateBranch(Inst.Inst,
    609                                                           Inst.Address,
    610                                                           Inst.Size);
    611             if (targ != -1ULL)
    612               DumpAddress(targ, Sections, MachOObj, outs());
    613 
    614             // Print debug info.
    615             if (diContext) {
    616               DILineInfo dli =
    617                 diContext->getLineInfoForAddress(SectAddress + Inst.Address);
    618               // Print valid line info if it changed.
    619               if (dli != lastLine && dli.getLine() != 0)
    620                 outs() << "\t## " << dli.getFileName() << ':'
    621                        << dli.getLine() << ':' << dli.getColumn();
    622               lastLine = dli;
    623             }
    624 
    625             outs() << '\n';
    626           }
    627         }
    628 
    629         emitDOTFile((f.getName().str() + ".dot").c_str(), f, IP.get());
    630       }
    631     }
    632   }
    633 }
    634