MachODump.cpp revision 196abbffe9b7a760593d68b99cbb5f961efc8e2a 
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>
42using namespace llvm;
43using namespace object;
44
45static 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
49static cl::opt<bool>
50  UseDbg("g", cl::desc("Print line information from debug info if available"));
51
52static cl::opt<std::string>
53  DSYMFile("dsym", cl::desc("Use .dSYM file for debug info"));
54
55static 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
90struct 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.
110static 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
132typedef std::map<uint64_t, MCFunction*> FunctionMapTy;
133typedef SmallVector<MCFunction, 16> FunctionListTy;
134static 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.
156static 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
202static void getSectionsAndSymbols(const macho::Header &Header,
203                                  MachOObjectFile *MachOObj,
204                                  std::vector<SectionRef> &Sections,
205                                  std::vector<SymbolRef> &Symbols,
206                                  SmallVectorImpl<uint64_t> &FoundFns) {
207  error_code ec;
208  for (symbol_iterator SI = MachOObj->begin_symbols(),
209       SE = MachOObj->end_symbols(); SI != SE; SI.increment(ec))
210    Symbols.push_back(*SI);
211
212  for (section_iterator SI = MachOObj->begin_sections(),
213       SE = MachOObj->end_sections(); SI != SE; SI.increment(ec)) {
214    SectionRef SR = *SI;
215    StringRef SectName;
216    SR.getName(SectName);
217    Sections.push_back(*SI);
218  }
219
220  for (unsigned i = 0; i != Header.NumLoadCommands; ++i) {
221    const MachOObject::LoadCommandInfo &LCI =
222       MachOObj->getObject()->getLoadCommandInfo(i);
223    if (LCI.Command.Type == macho::LCT_FunctionStarts) {
224      // We found a function starts segment, parse the addresses for later
225      // consumption.
226      const MachOFormat::LinkeditDataLoadCommand *LLC =
227        MachOObj->getLinkeditDataLoadCommand(LCI);
228
229      MachOObj->getObject()->ReadULEB128s(LLC->DataOffset, FoundFns);
230    }
231  }
232}
233
234void llvm::DisassembleInputMachO(StringRef Filename) {
235  OwningPtr<MemoryBuffer> Buff;
236
237  if (error_code ec = MemoryBuffer::getFileOrSTDIN(Filename, Buff)) {
238    errs() << "llvm-objdump: " << Filename << ": " << ec.message() << "\n";
239    return;
240  }
241
242  OwningPtr<MachOObjectFile> MachOOF(static_cast<MachOObjectFile*>(
243        ObjectFile::createMachOObjectFile(Buff.take())));
244  MachOObject *MachOObj = MachOOF->getObject();
245
246  const Target *TheTarget = GetTarget(MachOObj);
247  if (!TheTarget) {
248    // GetTarget prints out stuff.
249    return;
250  }
251  OwningPtr<const MCInstrInfo> InstrInfo(TheTarget->createMCInstrInfo());
252  OwningPtr<MCInstrAnalysis>
253    InstrAnalysis(TheTarget->createMCInstrAnalysis(InstrInfo.get()));
254
255  // Set up disassembler.
256  OwningPtr<const MCAsmInfo> AsmInfo(TheTarget->createMCAsmInfo(TripleName));
257  OwningPtr<const MCSubtargetInfo>
258    STI(TheTarget->createMCSubtargetInfo(TripleName, "", ""));
259  OwningPtr<const MCDisassembler> DisAsm(TheTarget->createMCDisassembler(*STI));
260  OwningPtr<const MCRegisterInfo> MRI(TheTarget->createMCRegInfo(TripleName));
261  int AsmPrinterVariant = AsmInfo->getAssemblerDialect();
262  OwningPtr<MCInstPrinter>
263    IP(TheTarget->createMCInstPrinter(AsmPrinterVariant, *AsmInfo, *InstrInfo,
264                                      *MRI, *STI));
265
266  if (!InstrAnalysis || !AsmInfo || !STI || !DisAsm || !IP) {
267    errs() << "error: couldn't initialize disassembler for target "
268           << TripleName << '\n';
269    return;
270  }
271
272  outs() << '\n' << Filename << ":\n\n";
273
274  const macho::Header &Header = MachOObj->getHeader();
275
276  std::vector<SectionRef> Sections;
277  std::vector<SymbolRef> Symbols;
278  SmallVector<uint64_t, 8> FoundFns;
279
280  getSectionsAndSymbols(Header, MachOOF.get(), Sections, Symbols, FoundFns);
281
282  // Make a copy of the unsorted symbol list. FIXME: duplication
283  std::vector<SymbolRef> UnsortedSymbols(Symbols);
284  // Sort the symbols by address, just in case they didn't come in that way.
285  std::sort(Symbols.begin(), Symbols.end(), SymbolSorter());
286
287#ifndef NDEBUG
288  raw_ostream &DebugOut = DebugFlag ? dbgs() : nulls();
289#else
290  raw_ostream &DebugOut = nulls();
291#endif
292
293  OwningPtr<DIContext> diContext;
294  ObjectFile *DbgObj = MachOOF.get();
295  // Try to find debug info and set up the DIContext for it.
296  if (UseDbg) {
297    // A separate DSym file path was specified, parse it as a macho file,
298    // get the sections and supply it to the section name parsing machinery.
299    if (!DSYMFile.empty()) {
300      OwningPtr<MemoryBuffer> Buf;
301      if (error_code ec = MemoryBuffer::getFileOrSTDIN(DSYMFile.c_str(), Buf)) {
302        errs() << "llvm-objdump: " << Filename << ": " << ec.message() << '\n';
303        return;
304      }
305      DbgObj = ObjectFile::createMachOObjectFile(Buf.take());
306    }
307
308    // Setup the DIContext
309    diContext.reset(DIContext::getDWARFContext(DbgObj));
310  }
311
312  FunctionMapTy FunctionMap;
313  FunctionListTy Functions;
314
315  for (unsigned SectIdx = 0; SectIdx != Sections.size(); SectIdx++) {
316    StringRef SectName;
317    if (Sections[SectIdx].getName(SectName) ||
318        SectName != "__text")
319      continue; // Skip non-text sections
320
321    DataRefImpl DR = Sections[SectIdx].getRawDataRefImpl();
322    StringRef SegmentName = MachOOF->getSectionFinalSegmentName(DR);
323    if (SegmentName != "__TEXT")
324      continue;
325
326    // Insert the functions from the function starts segment into our map.
327    uint64_t VMAddr;
328    Sections[SectIdx].getAddress(VMAddr);
329    for (unsigned i = 0, e = FoundFns.size(); i != e; ++i) {
330      StringRef SectBegin;
331      Sections[SectIdx].getContents(SectBegin);
332      uint64_t Offset = (uint64_t)SectBegin.data();
333      FunctionMap.insert(std::make_pair(VMAddr + FoundFns[i]-Offset,
334                                        (MCFunction*)0));
335    }
336
337    StringRef Bytes;
338    Sections[SectIdx].getContents(Bytes);
339    StringRefMemoryObject memoryObject(Bytes);
340    bool symbolTableWorked = false;
341
342    // Parse relocations.
343    std::vector<std::pair<uint64_t, SymbolRef> > Relocs;
344    error_code ec;
345    for (relocation_iterator RI = Sections[SectIdx].begin_relocations(),
346         RE = Sections[SectIdx].end_relocations(); RI != RE; RI.increment(ec)) {
347      uint64_t RelocOffset, SectionAddress;
348      RI->getAddress(RelocOffset);
349      Sections[SectIdx].getAddress(SectionAddress);
350      RelocOffset -= SectionAddress;
351
352      SymbolRef RelocSym;
353      RI->getSymbol(RelocSym);
354
355      Relocs.push_back(std::make_pair(RelocOffset, RelocSym));
356    }
357    array_pod_sort(Relocs.begin(), Relocs.end());
358
359    // Disassemble symbol by symbol.
360    for (unsigned SymIdx = 0; SymIdx != Symbols.size(); SymIdx++) {
361      StringRef SymName;
362      Symbols[SymIdx].getName(SymName);
363
364      SymbolRef::Type ST;
365      Symbols[SymIdx].getType(ST);
366      if (ST != SymbolRef::ST_Function)
367        continue;
368
369      // Make sure the symbol is defined in this section.
370      bool containsSym = false;
371      Sections[SectIdx].containsSymbol(Symbols[SymIdx], containsSym);
372      if (!containsSym)
373        continue;
374
375      // Start at the address of the symbol relative to the section's address.
376      uint64_t SectionAddress = 0;
377      uint64_t Start = 0;
378      Sections[SectIdx].getAddress(SectionAddress);
379      Symbols[SymIdx].getAddress(Start);
380      Start -= SectionAddress;
381
382      // Stop disassembling either at the beginning of the next symbol or at
383      // the end of the section.
384      bool containsNextSym = false;
385      uint64_t NextSym = 0;
386      uint64_t NextSymIdx = SymIdx+1;
387      while (Symbols.size() > NextSymIdx) {
388        SymbolRef::Type NextSymType;
389        Symbols[NextSymIdx].getType(NextSymType);
390        if (NextSymType == SymbolRef::ST_Function) {
391          Sections[SectIdx].containsSymbol(Symbols[NextSymIdx],
392                                           containsNextSym);
393          Symbols[NextSymIdx].getAddress(NextSym);
394          NextSym -= SectionAddress;
395          break;
396        }
397        ++NextSymIdx;
398      }
399
400      uint64_t SectSize;
401      Sections[SectIdx].getSize(SectSize);
402      uint64_t End = containsNextSym ?  NextSym : SectSize;
403      uint64_t Size;
404
405      symbolTableWorked = true;
406
407      if (!CFG) {
408        // Normal disassembly, print addresses, bytes and mnemonic form.
409        StringRef SymName;
410        Symbols[SymIdx].getName(SymName);
411
412        outs() << SymName << ":\n";
413        DILineInfo lastLine;
414        for (uint64_t Index = Start; Index < End; Index += Size) {
415          MCInst Inst;
416
417          if (DisAsm->getInstruction(Inst, Size, memoryObject, Index,
418                                     DebugOut, nulls())) {
419            uint64_t SectAddress = 0;
420            Sections[SectIdx].getAddress(SectAddress);
421            outs() << format("%8" PRIx64 ":\t", SectAddress + Index);
422
423            DumpBytes(StringRef(Bytes.data() + Index, Size));
424            IP->printInst(&Inst, outs(), "");
425
426            // Print debug info.
427            if (diContext) {
428              DILineInfo dli =
429                diContext->getLineInfoForAddress(SectAddress + Index);
430              // Print valid line info if it changed.
431              if (dli != lastLine && dli.getLine() != 0)
432                outs() << "\t## " << dli.getFileName() << ':'
433                       << dli.getLine() << ':' << dli.getColumn();
434              lastLine = dli;
435            }
436            outs() << "\n";
437          } else {
438            errs() << "llvm-objdump: warning: invalid instruction encoding\n";
439            if (Size == 0)
440              Size = 1; // skip illegible bytes
441          }
442        }
443      } else {
444        // Create CFG and use it for disassembly.
445        StringRef SymName;
446        Symbols[SymIdx].getName(SymName);
447        createMCFunctionAndSaveCalls(
448            SymName, DisAsm.get(), memoryObject, Start, End,
449            InstrAnalysis.get(), Start, DebugOut, FunctionMap, Functions);
450      }
451    }
452    if (!CFG && !symbolTableWorked) {
453      // Reading the symbol table didn't work, disassemble the whole section.
454      uint64_t SectAddress;
455      Sections[SectIdx].getAddress(SectAddress);
456      uint64_t SectSize;
457      Sections[SectIdx].getSize(SectSize);
458      uint64_t InstSize;
459      for (uint64_t Index = 0; Index < SectSize; Index += InstSize) {
460        MCInst Inst;
461
462        if (DisAsm->getInstruction(Inst, InstSize, memoryObject, Index,
463                                   DebugOut, nulls())) {
464          outs() << format("%8" PRIx64 ":\t", SectAddress + Index);
465          DumpBytes(StringRef(Bytes.data() + Index, InstSize));
466          IP->printInst(&Inst, outs(), "");
467          outs() << "\n";
468        } else {
469          errs() << "llvm-objdump: warning: invalid instruction encoding\n";
470          if (InstSize == 0)
471            InstSize = 1; // skip illegible bytes
472        }
473      }
474    }
475
476    if (CFG) {
477      if (!symbolTableWorked) {
478        // Reading the symbol table didn't work, create a big __TEXT symbol.
479        uint64_t SectSize = 0, SectAddress = 0;
480        Sections[SectIdx].getSize(SectSize);
481        Sections[SectIdx].getAddress(SectAddress);
482        createMCFunctionAndSaveCalls("__TEXT", DisAsm.get(), memoryObject,
483                                     0, SectSize,
484                                     InstrAnalysis.get(),
485                                     SectAddress, DebugOut,
486                                     FunctionMap, Functions);
487      }
488      for (std::map<uint64_t, MCFunction*>::iterator mi = FunctionMap.begin(),
489           me = FunctionMap.end(); mi != me; ++mi)
490        if (mi->second == 0) {
491          // Create functions for the remaining callees we have gathered,
492          // but we didn't find a name for them.
493          uint64_t SectSize = 0;
494          Sections[SectIdx].getSize(SectSize);
495
496          SmallVector<uint64_t, 16> Calls;
497          MCFunction f =
498            MCFunction::createFunctionFromMC("unknown", DisAsm.get(),
499                                             memoryObject, mi->first,
500                                             SectSize,
501                                             InstrAnalysis.get(), DebugOut,
502                                             Calls);
503          Functions.push_back(f);
504          mi->second = &Functions.back();
505          for (unsigned i = 0, e = Calls.size(); i != e; ++i) {
506            std::pair<uint64_t, MCFunction*> p(Calls[i], (MCFunction*)0);
507            if (FunctionMap.insert(p).second)
508              mi = FunctionMap.begin();
509          }
510        }
511
512      DenseSet<uint64_t> PrintedBlocks;
513      for (unsigned ffi = 0, ffe = Functions.size(); ffi != ffe; ++ffi) {
514        MCFunction &f = Functions[ffi];
515        for (MCFunction::iterator fi = f.begin(), fe = f.end(); fi != fe; ++fi){
516          if (!PrintedBlocks.insert(fi->first).second)
517            continue; // We already printed this block.
518
519          // We assume a block has predecessors when it's the first block after
520          // a symbol.
521          bool hasPreds = FunctionMap.find(fi->first) != FunctionMap.end();
522
523          // See if this block has predecessors.
524          // FIXME: Slow.
525          for (MCFunction::iterator pi = f.begin(), pe = f.end(); pi != pe;
526              ++pi)
527            if (pi->second.contains(fi->first)) {
528              hasPreds = true;
529              break;
530            }
531
532          uint64_t SectSize = 0, SectAddress;
533          Sections[SectIdx].getSize(SectSize);
534          Sections[SectIdx].getAddress(SectAddress);
535
536          // No predecessors, this is a data block. Print as .byte directives.
537          if (!hasPreds) {
538            uint64_t End = llvm::next(fi) == fe ? SectSize :
539                                                  llvm::next(fi)->first;
540            outs() << "# " << End-fi->first << " bytes of data:\n";
541            for (unsigned pos = fi->first; pos != End; ++pos) {
542              outs() << format("%8x:\t", SectAddress + pos);
543              DumpBytes(StringRef(Bytes.data() + pos, 1));
544              outs() << format("\t.byte 0x%02x\n", (uint8_t)Bytes[pos]);
545            }
546            continue;
547          }
548
549          if (fi->second.contains(fi->first)) // Print a header for simple loops
550            outs() << "# Loop begin:\n";
551
552          DILineInfo lastLine;
553          // Walk over the instructions and print them.
554          for (unsigned ii = 0, ie = fi->second.getInsts().size(); ii != ie;
555               ++ii) {
556            const MCDecodedInst &Inst = fi->second.getInsts()[ii];
557
558            // If there's a symbol at this address, print its name.
559            if (FunctionMap.find(SectAddress + Inst.Address) !=
560                FunctionMap.end())
561              outs() << FunctionMap[SectAddress + Inst.Address]-> getName()
562                     << ":\n";
563
564            outs() << format("%8" PRIx64 ":\t", SectAddress + Inst.Address);
565            DumpBytes(StringRef(Bytes.data() + Inst.Address, Inst.Size));
566
567            if (fi->second.contains(fi->first)) // Indent simple loops.
568              outs() << '\t';
569
570            IP->printInst(&Inst.Inst, outs(), "");
571
572            // Look for relocations inside this instructions, if there is one
573            // print its target and additional information if available.
574            for (unsigned j = 0; j != Relocs.size(); ++j)
575              if (Relocs[j].first >= SectAddress + Inst.Address &&
576                  Relocs[j].first < SectAddress + Inst.Address + Inst.Size) {
577                StringRef SymName;
578                uint64_t Addr;
579                Relocs[j].second.getAddress(Addr);
580                Relocs[j].second.getName(SymName);
581
582                outs() << "\t# " << SymName << ' ';
583                DumpAddress(Addr, Sections, MachOObj, outs());
584              }
585
586            // If this instructions contains an address, see if we can evaluate
587            // it and print additional information.
588            uint64_t targ = InstrAnalysis->evaluateBranch(Inst.Inst,
589                                                          Inst.Address,
590                                                          Inst.Size);
591            if (targ != -1ULL)
592              DumpAddress(targ, Sections, MachOObj, outs());
593
594            // Print debug info.
595            if (diContext) {
596              DILineInfo dli =
597                diContext->getLineInfoForAddress(SectAddress + Inst.Address);
598              // Print valid line info if it changed.
599              if (dli != lastLine && dli.getLine() != 0)
600                outs() << "\t## " << dli.getFileName() << ':'
601                       << dli.getLine() << ':' << dli.getColumn();
602              lastLine = dli;
603            }
604
605            outs() << '\n';
606          }
607        }
608
609        emitDOTFile((f.getName().str() + ".dot").c_str(), f, IP.get());
610      }
611    }
612  }
613}
614