MachODump.cpp revision fd7aa38e304a09fa0ef51b85b773b649b7e58c5e 
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/Casting.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/MachO.h"
36#include "llvm/Support/MemoryBuffer.h"
37#include "llvm/Support/TargetRegistry.h"
38#include "llvm/Support/TargetSelect.h"
39#include "llvm/Support/raw_ostream.h"
40#include "llvm/Support/system_error.h"
41#include <algorithm>
42#include <cstring>
43using namespace llvm;
44using namespace object;
45
46static cl::opt<bool>
47  CFG("cfg", cl::desc("Create a CFG for every symbol in the object file and"
48                      " write it to a graphviz file (MachO-only)"));
49
50static cl::opt<bool>
51  UseDbg("g", cl::desc("Print line information from debug info if available"));
52
53static cl::opt<std::string>
54  DSYMFile("dsym", cl::desc("Use .dSYM file for debug info"));
55
56static const Target *GetTarget(const MachOObjectFile *MachOObj) {
57  // Figure out the target triple.
58  if (TripleName.empty()) {
59    llvm::Triple TT("unknown-unknown-unknown");
60    TT.setArch(Triple::ArchType(MachOObj->getArch()));
61    TripleName = TT.str();
62  }
63
64  // Get the target specific parser.
65  std::string Error;
66  const Target *TheTarget = TargetRegistry::lookupTarget(TripleName, Error);
67  if (TheTarget)
68    return TheTarget;
69
70  errs() << "llvm-objdump: error: unable to get target for '" << TripleName
71         << "', see --version and --triple.\n";
72  return 0;
73}
74
75struct SymbolSorter {
76  bool operator()(const SymbolRef &A, const SymbolRef &B) {
77    SymbolRef::Type AType, BType;
78    A.getType(AType);
79    B.getType(BType);
80
81    uint64_t AAddr, BAddr;
82    if (AType != SymbolRef::ST_Function)
83      AAddr = 0;
84    else
85      A.getAddress(AAddr);
86    if (BType != SymbolRef::ST_Function)
87      BAddr = 0;
88    else
89      B.getAddress(BAddr);
90    return AAddr < BAddr;
91  }
92};
93
94// Print additional information about an address, if available.
95static void DumpAddress(uint64_t Address, ArrayRef<SectionRef> Sections,
96                        const MachOObjectFile *MachOObj, raw_ostream &OS) {
97  for (unsigned i = 0; i != Sections.size(); ++i) {
98    uint64_t SectAddr = 0, SectSize = 0;
99    Sections[i].getAddress(SectAddr);
100    Sections[i].getSize(SectSize);
101    uint64_t addr = SectAddr;
102    if (SectAddr <= Address &&
103        SectAddr + SectSize > Address) {
104      StringRef bytes, name;
105      Sections[i].getContents(bytes);
106      Sections[i].getName(name);
107      // Print constant strings.
108      if (!name.compare("__cstring"))
109        OS << '"' << bytes.substr(addr, bytes.find('\0', addr)) << '"';
110      // Print constant CFStrings.
111      if (!name.compare("__cfstring"))
112        OS << "@\"" << bytes.substr(addr, bytes.find('\0', addr)) << '"';
113    }
114  }
115}
116
117typedef std::map<uint64_t, MCFunction*> FunctionMapTy;
118typedef SmallVector<MCFunction, 16> FunctionListTy;
119static void createMCFunctionAndSaveCalls(StringRef Name,
120                                         const MCDisassembler *DisAsm,
121                                         MemoryObject &Object, uint64_t Start,
122                                         uint64_t End,
123                                         MCInstrAnalysis *InstrAnalysis,
124                                         uint64_t Address,
125                                         raw_ostream &DebugOut,
126                                         FunctionMapTy &FunctionMap,
127                                         FunctionListTy &Functions) {
128  SmallVector<uint64_t, 16> Calls;
129  MCFunction f =
130    MCFunction::createFunctionFromMC(Name, DisAsm, Object, Start, End,
131                                     InstrAnalysis, DebugOut, Calls);
132  Functions.push_back(f);
133  FunctionMap[Address] = &Functions.back();
134
135  // Add the gathered callees to the map.
136  for (unsigned i = 0, e = Calls.size(); i != e; ++i)
137    FunctionMap.insert(std::make_pair(Calls[i], (MCFunction*)0));
138}
139
140// Write a graphviz file for the CFG inside an MCFunction.
141static void emitDOTFile(const char *FileName, const MCFunction &f,
142                        MCInstPrinter *IP) {
143  // Start a new dot file.
144  std::string Error;
145  raw_fd_ostream Out(FileName, Error);
146  if (!Error.empty()) {
147    errs() << "llvm-objdump: warning: " << Error << '\n';
148    return;
149  }
150
151  Out << "digraph " << f.getName() << " {\n";
152  Out << "graph [ rankdir = \"LR\" ];\n";
153  for (MCFunction::iterator i = f.begin(), e = f.end(); i != e; ++i) {
154    bool hasPreds = false;
155    // Only print blocks that have predecessors.
156    // FIXME: Slow.
157    for (MCFunction::iterator pi = f.begin(), pe = f.end(); pi != pe;
158        ++pi)
159      if (pi->second.contains(i->first)) {
160        hasPreds = true;
161        break;
162      }
163
164    if (!hasPreds && i != f.begin())
165      continue;
166
167    Out << '"' << i->first << "\" [ label=\"<a>";
168    // Print instructions.
169    for (unsigned ii = 0, ie = i->second.getInsts().size(); ii != ie;
170        ++ii) {
171      // Escape special chars and print the instruction in mnemonic form.
172      std::string Str;
173      raw_string_ostream OS(Str);
174      IP->printInst(&i->second.getInsts()[ii].Inst, OS, "");
175      Out << DOT::EscapeString(OS.str()) << '|';
176    }
177    Out << "<o>\" shape=\"record\" ];\n";
178
179    // Add edges.
180    for (MCBasicBlock::succ_iterator si = i->second.succ_begin(),
181        se = i->second.succ_end(); si != se; ++si)
182      Out << i->first << ":o -> " << *si <<":a\n";
183  }
184  Out << "}\n";
185}
186
187static void
188getSectionsAndSymbols(const macho::Header Header,
189                      MachOObjectFile *MachOObj,
190                      std::vector<SectionRef> &Sections,
191                      std::vector<SymbolRef> &Symbols,
192                      SmallVectorImpl<uint64_t> &FoundFns) {
193  error_code ec;
194  for (symbol_iterator SI = MachOObj->begin_symbols(),
195       SE = MachOObj->end_symbols(); SI != SE; SI.increment(ec))
196    Symbols.push_back(*SI);
197
198  for (section_iterator SI = MachOObj->begin_sections(),
199       SE = MachOObj->end_sections(); SI != SE; SI.increment(ec)) {
200    SectionRef SR = *SI;
201    StringRef SectName;
202    SR.getName(SectName);
203    Sections.push_back(*SI);
204  }
205
206  MachOObjectFile::LoadCommandInfo Command =
207    MachOObj->getFirstLoadCommandInfo();
208  for (unsigned i = 0; i != Header.NumLoadCommands; ++i) {
209    if (Command.C.Type == macho::LCT_FunctionStarts) {
210      // We found a function starts segment, parse the addresses for later
211      // consumption.
212      macho::LinkeditDataLoadCommand LLC =
213        MachOObj->getLinkeditDataLoadCommand(Command);
214
215      MachOObj->ReadULEB128s(LLC.DataOffset, FoundFns);
216    }
217    Command = MachOObj->getNextLoadCommandInfo(Command);
218  }
219}
220
221static void DisassembleInputMachO2(StringRef Filename,
222                                   MachOObjectFile *MachOOF);
223
224void llvm::DisassembleInputMachO(StringRef Filename) {
225  OwningPtr<MemoryBuffer> Buff;
226
227  if (error_code ec = MemoryBuffer::getFileOrSTDIN(Filename, Buff)) {
228    errs() << "llvm-objdump: " << Filename << ": " << ec.message() << "\n";
229    return;
230  }
231
232  OwningPtr<MachOObjectFile> MachOOF(static_cast<MachOObjectFile*>(
233        ObjectFile::createMachOObjectFile(Buff.take())));
234
235  DisassembleInputMachO2(Filename, MachOOF.get());
236}
237
238static void DisassembleInputMachO2(StringRef Filename,
239                                   MachOObjectFile *MachOOF) {
240  const Target *TheTarget = GetTarget(MachOOF);
241  if (!TheTarget) {
242    // GetTarget prints out stuff.
243    return;
244  }
245  OwningPtr<const MCInstrInfo> InstrInfo(TheTarget->createMCInstrInfo());
246  OwningPtr<MCInstrAnalysis>
247    InstrAnalysis(TheTarget->createMCInstrAnalysis(InstrInfo.get()));
248
249  // Set up disassembler.
250  OwningPtr<const MCAsmInfo> AsmInfo(TheTarget->createMCAsmInfo(TripleName));
251  OwningPtr<const MCSubtargetInfo>
252    STI(TheTarget->createMCSubtargetInfo(TripleName, "", ""));
253  OwningPtr<const MCDisassembler> DisAsm(TheTarget->createMCDisassembler(*STI));
254  OwningPtr<const MCRegisterInfo> MRI(TheTarget->createMCRegInfo(TripleName));
255  int AsmPrinterVariant = AsmInfo->getAssemblerDialect();
256  OwningPtr<MCInstPrinter>
257    IP(TheTarget->createMCInstPrinter(AsmPrinterVariant, *AsmInfo, *InstrInfo,
258                                      *MRI, *STI));
259
260  if (!InstrAnalysis || !AsmInfo || !STI || !DisAsm || !IP) {
261    errs() << "error: couldn't initialize disassembler for target "
262           << TripleName << '\n';
263    return;
264  }
265
266  outs() << '\n' << Filename << ":\n\n";
267
268  macho::Header Header = MachOOF->getHeader();
269
270  std::vector<SectionRef> Sections;
271  std::vector<SymbolRef> Symbols;
272  SmallVector<uint64_t, 8> FoundFns;
273
274  getSectionsAndSymbols(Header, MachOOF, Sections, Symbols, FoundFns);
275
276  // Make a copy of the unsorted symbol list. FIXME: duplication
277  std::vector<SymbolRef> UnsortedSymbols(Symbols);
278  // Sort the symbols by address, just in case they didn't come in that way.
279  std::sort(Symbols.begin(), Symbols.end(), SymbolSorter());
280
281#ifndef NDEBUG
282  raw_ostream &DebugOut = DebugFlag ? dbgs() : nulls();
283#else
284  raw_ostream &DebugOut = nulls();
285#endif
286
287  OwningPtr<DIContext> diContext;
288  ObjectFile *DbgObj = MachOOF;
289  // Try to find debug info and set up the DIContext for it.
290  if (UseDbg) {
291    // A separate DSym file path was specified, parse it as a macho file,
292    // get the sections and supply it to the section name parsing machinery.
293    if (!DSYMFile.empty()) {
294      OwningPtr<MemoryBuffer> Buf;
295      if (error_code ec = MemoryBuffer::getFileOrSTDIN(DSYMFile.c_str(), Buf)) {
296        errs() << "llvm-objdump: " << Filename << ": " << ec.message() << '\n';
297        return;
298      }
299      DbgObj = ObjectFile::createMachOObjectFile(Buf.take());
300    }
301
302    // Setup the DIContext
303    diContext.reset(DIContext::getDWARFContext(DbgObj));
304  }
305
306  FunctionMapTy FunctionMap;
307  FunctionListTy Functions;
308
309  for (unsigned SectIdx = 0; SectIdx != Sections.size(); SectIdx++) {
310    StringRef SectName;
311    if (Sections[SectIdx].getName(SectName) ||
312        SectName != "__text")
313      continue; // Skip non-text sections
314
315    DataRefImpl DR = Sections[SectIdx].getRawDataRefImpl();
316    StringRef SegmentName = MachOOF->getSectionFinalSegmentName(DR);
317    if (SegmentName != "__TEXT")
318      continue;
319
320    // Insert the functions from the function starts segment into our map.
321    uint64_t VMAddr;
322    Sections[SectIdx].getAddress(VMAddr);
323    for (unsigned i = 0, e = FoundFns.size(); i != e; ++i) {
324      StringRef SectBegin;
325      Sections[SectIdx].getContents(SectBegin);
326      uint64_t Offset = (uint64_t)SectBegin.data();
327      FunctionMap.insert(std::make_pair(VMAddr + FoundFns[i]-Offset,
328                                        (MCFunction*)0));
329    }
330
331    StringRef Bytes;
332    Sections[SectIdx].getContents(Bytes);
333    StringRefMemoryObject memoryObject(Bytes);
334    bool symbolTableWorked = false;
335
336    // Parse relocations.
337    std::vector<std::pair<uint64_t, SymbolRef> > Relocs;
338    error_code ec;
339    for (relocation_iterator RI = Sections[SectIdx].begin_relocations(),
340         RE = Sections[SectIdx].end_relocations(); RI != RE; RI.increment(ec)) {
341      uint64_t RelocOffset, SectionAddress;
342      RI->getAddress(RelocOffset);
343      Sections[SectIdx].getAddress(SectionAddress);
344      RelocOffset -= SectionAddress;
345
346      SymbolRef RelocSym;
347      RI->getSymbol(RelocSym);
348
349      Relocs.push_back(std::make_pair(RelocOffset, RelocSym));
350    }
351    array_pod_sort(Relocs.begin(), Relocs.end());
352
353    // Disassemble symbol by symbol.
354    for (unsigned SymIdx = 0; SymIdx != Symbols.size(); SymIdx++) {
355      StringRef SymName;
356      Symbols[SymIdx].getName(SymName);
357
358      SymbolRef::Type ST;
359      Symbols[SymIdx].getType(ST);
360      if (ST != SymbolRef::ST_Function)
361        continue;
362
363      // Make sure the symbol is defined in this section.
364      bool containsSym = false;
365      Sections[SectIdx].containsSymbol(Symbols[SymIdx], containsSym);
366      if (!containsSym)
367        continue;
368
369      // Start at the address of the symbol relative to the section's address.
370      uint64_t SectionAddress = 0;
371      uint64_t Start = 0;
372      Sections[SectIdx].getAddress(SectionAddress);
373      Symbols[SymIdx].getAddress(Start);
374      Start -= SectionAddress;
375
376      // Stop disassembling either at the beginning of the next symbol or at
377      // the end of the section.
378      bool containsNextSym = false;
379      uint64_t NextSym = 0;
380      uint64_t NextSymIdx = SymIdx+1;
381      while (Symbols.size() > NextSymIdx) {
382        SymbolRef::Type NextSymType;
383        Symbols[NextSymIdx].getType(NextSymType);
384        if (NextSymType == SymbolRef::ST_Function) {
385          Sections[SectIdx].containsSymbol(Symbols[NextSymIdx],
386                                           containsNextSym);
387          Symbols[NextSymIdx].getAddress(NextSym);
388          NextSym -= SectionAddress;
389          break;
390        }
391        ++NextSymIdx;
392      }
393
394      uint64_t SectSize;
395      Sections[SectIdx].getSize(SectSize);
396      uint64_t End = containsNextSym ?  NextSym : SectSize;
397      uint64_t Size;
398
399      symbolTableWorked = true;
400
401      if (!CFG) {
402        // Normal disassembly, print addresses, bytes and mnemonic form.
403        StringRef SymName;
404        Symbols[SymIdx].getName(SymName);
405
406        outs() << SymName << ":\n";
407        DILineInfo lastLine;
408        for (uint64_t Index = Start; Index < End; Index += Size) {
409          MCInst Inst;
410
411          if (DisAsm->getInstruction(Inst, Size, memoryObject, Index,
412                                     DebugOut, nulls())) {
413            uint64_t SectAddress = 0;
414            Sections[SectIdx].getAddress(SectAddress);
415            outs() << format("%8" PRIx64 ":\t", SectAddress + Index);
416
417            DumpBytes(StringRef(Bytes.data() + Index, Size));
418            IP->printInst(&Inst, outs(), "");
419
420            // Print debug info.
421            if (diContext) {
422              DILineInfo dli =
423                diContext->getLineInfoForAddress(SectAddress + Index);
424              // Print valid line info if it changed.
425              if (dli != lastLine && dli.getLine() != 0)
426                outs() << "\t## " << dli.getFileName() << ':'
427                       << dli.getLine() << ':' << dli.getColumn();
428              lastLine = dli;
429            }
430            outs() << "\n";
431          } else {
432            errs() << "llvm-objdump: warning: invalid instruction encoding\n";
433            if (Size == 0)
434              Size = 1; // skip illegible bytes
435          }
436        }
437      } else {
438        // Create CFG and use it for disassembly.
439        StringRef SymName;
440        Symbols[SymIdx].getName(SymName);
441        createMCFunctionAndSaveCalls(
442            SymName, DisAsm.get(), memoryObject, Start, End,
443            InstrAnalysis.get(), Start, DebugOut, FunctionMap, Functions);
444      }
445    }
446    if (!CFG && !symbolTableWorked) {
447      // Reading the symbol table didn't work, disassemble the whole section.
448      uint64_t SectAddress;
449      Sections[SectIdx].getAddress(SectAddress);
450      uint64_t SectSize;
451      Sections[SectIdx].getSize(SectSize);
452      uint64_t InstSize;
453      for (uint64_t Index = 0; Index < SectSize; Index += InstSize) {
454        MCInst Inst;
455
456        if (DisAsm->getInstruction(Inst, InstSize, memoryObject, Index,
457                                   DebugOut, nulls())) {
458          outs() << format("%8" PRIx64 ":\t", SectAddress + Index);
459          DumpBytes(StringRef(Bytes.data() + Index, InstSize));
460          IP->printInst(&Inst, outs(), "");
461          outs() << "\n";
462        } else {
463          errs() << "llvm-objdump: warning: invalid instruction encoding\n";
464          if (InstSize == 0)
465            InstSize = 1; // skip illegible bytes
466        }
467      }
468    }
469
470    if (CFG) {
471      if (!symbolTableWorked) {
472        // Reading the symbol table didn't work, create a big __TEXT symbol.
473        uint64_t SectSize = 0, SectAddress = 0;
474        Sections[SectIdx].getSize(SectSize);
475        Sections[SectIdx].getAddress(SectAddress);
476        createMCFunctionAndSaveCalls("__TEXT", DisAsm.get(), memoryObject,
477                                     0, SectSize,
478                                     InstrAnalysis.get(),
479                                     SectAddress, DebugOut,
480                                     FunctionMap, Functions);
481      }
482      for (std::map<uint64_t, MCFunction*>::iterator mi = FunctionMap.begin(),
483           me = FunctionMap.end(); mi != me; ++mi)
484        if (mi->second == 0) {
485          // Create functions for the remaining callees we have gathered,
486          // but we didn't find a name for them.
487          uint64_t SectSize = 0;
488          Sections[SectIdx].getSize(SectSize);
489
490          SmallVector<uint64_t, 16> Calls;
491          MCFunction f =
492            MCFunction::createFunctionFromMC("unknown", DisAsm.get(),
493                                             memoryObject, mi->first,
494                                             SectSize,
495                                             InstrAnalysis.get(), DebugOut,
496                                             Calls);
497          Functions.push_back(f);
498          mi->second = &Functions.back();
499          for (unsigned i = 0, e = Calls.size(); i != e; ++i) {
500            std::pair<uint64_t, MCFunction*> p(Calls[i], (MCFunction*)0);
501            if (FunctionMap.insert(p).second)
502              mi = FunctionMap.begin();
503          }
504        }
505
506      DenseSet<uint64_t> PrintedBlocks;
507      for (unsigned ffi = 0, ffe = Functions.size(); ffi != ffe; ++ffi) {
508        MCFunction &f = Functions[ffi];
509        for (MCFunction::iterator fi = f.begin(), fe = f.end(); fi != fe; ++fi){
510          if (!PrintedBlocks.insert(fi->first).second)
511            continue; // We already printed this block.
512
513          // We assume a block has predecessors when it's the first block after
514          // a symbol.
515          bool hasPreds = FunctionMap.find(fi->first) != FunctionMap.end();
516
517          // See if this block has predecessors.
518          // FIXME: Slow.
519          for (MCFunction::iterator pi = f.begin(), pe = f.end(); pi != pe;
520              ++pi)
521            if (pi->second.contains(fi->first)) {
522              hasPreds = true;
523              break;
524            }
525
526          uint64_t SectSize = 0, SectAddress;
527          Sections[SectIdx].getSize(SectSize);
528          Sections[SectIdx].getAddress(SectAddress);
529
530          // No predecessors, this is a data block. Print as .byte directives.
531          if (!hasPreds) {
532            uint64_t End = llvm::next(fi) == fe ? SectSize :
533                                                  llvm::next(fi)->first;
534            outs() << "# " << End-fi->first << " bytes of data:\n";
535            for (unsigned pos = fi->first; pos != End; ++pos) {
536              outs() << format("%8x:\t", SectAddress + pos);
537              DumpBytes(StringRef(Bytes.data() + pos, 1));
538              outs() << format("\t.byte 0x%02x\n", (uint8_t)Bytes[pos]);
539            }
540            continue;
541          }
542
543          if (fi->second.contains(fi->first)) // Print a header for simple loops
544            outs() << "# Loop begin:\n";
545
546          DILineInfo lastLine;
547          // Walk over the instructions and print them.
548          for (unsigned ii = 0, ie = fi->second.getInsts().size(); ii != ie;
549               ++ii) {
550            const MCDecodedInst &Inst = fi->second.getInsts()[ii];
551
552            // If there's a symbol at this address, print its name.
553            if (FunctionMap.find(SectAddress + Inst.Address) !=
554                FunctionMap.end())
555              outs() << FunctionMap[SectAddress + Inst.Address]-> getName()
556                     << ":\n";
557
558            outs() << format("%8" PRIx64 ":\t", SectAddress + Inst.Address);
559            DumpBytes(StringRef(Bytes.data() + Inst.Address, Inst.Size));
560
561            if (fi->second.contains(fi->first)) // Indent simple loops.
562              outs() << '\t';
563
564            IP->printInst(&Inst.Inst, outs(), "");
565
566            // Look for relocations inside this instructions, if there is one
567            // print its target and additional information if available.
568            for (unsigned j = 0; j != Relocs.size(); ++j)
569              if (Relocs[j].first >= SectAddress + Inst.Address &&
570                  Relocs[j].first < SectAddress + Inst.Address + Inst.Size) {
571                StringRef SymName;
572                uint64_t Addr;
573                Relocs[j].second.getAddress(Addr);
574                Relocs[j].second.getName(SymName);
575
576                outs() << "\t# " << SymName << ' ';
577                DumpAddress(Addr, Sections, MachOOF, outs());
578              }
579
580            // If this instructions contains an address, see if we can evaluate
581            // it and print additional information.
582            uint64_t targ = InstrAnalysis->evaluateBranch(Inst.Inst,
583                                                          Inst.Address,
584                                                          Inst.Size);
585            if (targ != -1ULL)
586              DumpAddress(targ, Sections, MachOOF, outs());
587
588            // Print debug info.
589            if (diContext) {
590              DILineInfo dli =
591                diContext->getLineInfoForAddress(SectAddress + Inst.Address);
592              // Print valid line info if it changed.
593              if (dli != lastLine && dli.getLine() != 0)
594                outs() << "\t## " << dli.getFileName() << ':'
595                       << dli.getLine() << ':' << dli.getColumn();
596              lastLine = dli;
597            }
598
599            outs() << '\n';
600          }
601        }
602
603        emitDOTFile((f.getName().str() + ".dot").c_str(), f, IP.get());
604      }
605    }
606  }
607}
608