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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/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, uint32_t> > 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       uint32_t RelocInfo;
    398       RI->getType(RelocInfo);
    399 
    400       Relocs.push_back(std::make_pair(RelocOffset, RelocInfo));
    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("%8llx:\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("%8llx:\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                 UnsortedSymbols[Relocs[j].second].getName(SymName);
    598                 UnsortedSymbols[Relocs[j].second].getAddress(Addr);
    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 }
    632