C++ DILineInfo类代码示例

static void DumpInput(const StringRef &Filename) {
  OwningPtr<MemoryBuffer> Buff;

  if (error_code ec = MemoryBuffer::getFileOrSTDIN(Filename, Buff)) {
    errs() << Filename << ": " << ec.message() << "\n";
    return;
  }

  OwningPtr<ObjectFile> Obj(ObjectFile::createObjectFile(Buff.take()));

  StringRef DebugInfoSection;
  StringRef DebugAbbrevSection;
  StringRef DebugLineSection;
  StringRef DebugArangesSection;
  StringRef DebugStringSection;

  error_code ec;
  for (ObjectFile::section_iterator i = Obj->begin_sections(),
                                    e = Obj->end_sections();
                                    i != e; i.increment(ec)) {
    StringRef name;
    i->getName(name);
    StringRef data;
    i->getContents(data);

    if (name.startswith("__DWARF,"))
      name = name.substr(8); // Skip "__DWARF," prefix.
    name = name.substr(name.find_first_not_of("._")); // Skip . and _ prefixes.
    if (name == "debug_info")
      DebugInfoSection = data;
    else if (name == "debug_abbrev")
      DebugAbbrevSection = data;
    else if (name == "debug_line")
      DebugLineSection = data;
    else if (name == "debug_aranges")
      DebugArangesSection = data;
    else if (name == "debug_str")
      DebugStringSection = data;
  }

  OwningPtr<DIContext> dictx(DIContext::getDWARFContext(/*FIXME*/true,
                                                        DebugInfoSection,
                                                        DebugAbbrevSection,
                                                        DebugArangesSection,
                                                        DebugLineSection,
                                                        DebugStringSection));
  if (Address == -1ULL) {
    outs() << Filename
           << ":\tfile format " << Obj->getFileFormatName() << "\n\n";
    // Dump the complete DWARF structure.
    dictx->dump(outs());
  } else {
    // Print line info for the specified address.
    DILineInfo dli = dictx->getLineInfoForAddress(Address);
    outs() << (dli.getFileName() ? dli.getFileName() : "<unknown>") << ':'
           << dli.getLine() << ':' << dli.getColumn() << '\n';
  }
}

std::string LLVMSymbolizer::printDILineInfo(DILineInfo LineInfo) const {
  // By default, DILineInfo contains "<invalid>" for function/filename it
  // cannot fetch. We replace it to "??" to make our output closer to addr2line.
  static const std::string kDILineInfoBadString = "<invalid>";
  std::stringstream Result;
  if (Opts.PrintFunctions) {
    std::string FunctionName = LineInfo.getFunctionName();
    if (FunctionName == kDILineInfoBadString)
      FunctionName = kBadString;
    DemangleName(FunctionName);
    Result << FunctionName << "\n";
  }
  std::string Filename = LineInfo.getFileName();
  if (Filename == kDILineInfoBadString)
    Filename = kBadString;
  Result << Filename << ":" << LineInfo.getLine()
                     << ":" << LineInfo.getColumn() << "\n";
  return Result.str();
}

static void PrintDILineInfo(DILineInfo dli) {
  if (PrintFunctions)
    outs() << (dli.getFunctionName() ? dli.getFunctionName() : "<unknown>")
           << "\n";
  outs() << (dli.getFileName() ? dli.getFileName() : "<unknown>") << ':'
         << dli.getLine() << ':' << dli.getColumn() << '\n';
}

void lookup_pointer(DIContext *context, const char **name, size_t *line, const char **filename, size_t pointer, int demangle, int *fromC)
{
    DILineInfo info;
    if (demangle && *name != NULL)
        *name = jl_demangle(*name);
    #ifdef LLVM35
    DILineInfoSpecifier infoSpec(DILineInfoSpecifier::FileLineInfoKind::AbsoluteFilePath,
                                 DILineInfoSpecifier::FunctionNameKind::ShortName);
    #else
    int infoSpec = DILineInfoSpecifier::FileLineInfo |
                   DILineInfoSpecifier::AbsoluteFilePath |
                   DILineInfoSpecifier::FunctionName;
    #endif
    if (context == NULL) goto done;
    info = context->getLineInfoForAddress(pointer, infoSpec);
    #ifndef LLVM35 // LLVM <= 3.4
    if (strcmp(info.getFunctionName(), "<invalid>") == 0) goto done;
    if (demangle)
        *name = jl_demangle(info.getFunctionName());
    else
        *name = strdup(info.getFunctionName());
    *line = info.getLine();
    *filename = strdup(info.getFileName());
    #else
    if (strcmp(info.FunctionName.c_str(), "<invalid>") == 0) goto done;
    *name = strdup(info.FunctionName.c_str());
    *line = info.Line;
    *filename = strdup(info.FileName.c_str());
    #endif
    done:
    // If this is a jlcall wrapper, set fromC to match JIT behavior
    if (*name == NULL || memcmp(*name,"jlcall_",7) == 0)
        *fromC = true;
}

void lookup_pointer(DIContext *context, const char **name, int *line, const char **filename, size_t pointer, int demangle)
{
    if (context == NULL) return;
    #ifdef LLVM35
    DILineInfoSpecifier infoSpec(DILineInfoSpecifier::FileLineInfoKind::AbsoluteFilePath,
                                 DILineInfoSpecifier::FunctionNameKind::ShortName);
    #else
    int infoSpec = DILineInfoSpecifier::FileLineInfo |
                   DILineInfoSpecifier::AbsoluteFilePath |
                   DILineInfoSpecifier::FunctionName;
    #endif
    DILineInfo info = context->getLineInfoForAddress(pointer, infoSpec);

    #ifndef LLVM35 // LLVM <= 3.4
    if (strcmp(info.getFunctionName(), "<invalid>") == 0) return;
    if (demangle)
	*name = jl_demangle(info.getFunctionName());
    else
	*name = strdup(info.getFunctionName());
    *line = info.getLine();
    *filename = strdup(info.getFileName());
    #else
    if (strcmp(info.FunctionName.c_str(), "<invalid>") == 0) return;
    *name = strdup(info.FunctionName.c_str());
    *line = info.Line;
    *filename = strdup(info.FileName.c_str());
    #endif
}

static void patchFunctionNameInDILineInfo(const std::string &NewFunctionName,
                                          DILineInfo &LineInfo) {
  std::string FileName = LineInfo.getFileName();
  LineInfo = DILineInfo(StringRef(FileName), StringRef(NewFunctionName),
                        LineInfo.getLine(), LineInfo.getColumn());
}

//.........这里部分代码省略.........
      Start -= SectionAddress;

      // Stop disassembling either at the beginning of the next symbol or at
      // the end of the section.
      bool containsNextSym = false;
      uint64_t NextSym = 0;
      uint64_t NextSymIdx = SymIdx+1;
      while (Symbols.size() > NextSymIdx) {
        SymbolRef::Type NextSymType;
        Symbols[NextSymIdx].getType(NextSymType);
        if (NextSymType == SymbolRef::ST_Function) {
          Sections[SectIdx].containsSymbol(Symbols[NextSymIdx],
                                           containsNextSym);
          Symbols[NextSymIdx].getAddress(NextSym);
          NextSym -= SectionAddress;
          break;
        }
        ++NextSymIdx;
      }

      uint64_t SectSize;
      Sections[SectIdx].getSize(SectSize);
      uint64_t End = containsNextSym ?  NextSym : SectSize;
      uint64_t Size;

      symbolTableWorked = true;

      if (!CFG) {
        // Normal disassembly, print addresses, bytes and mnemonic form.
        StringRef SymName;
        Symbols[SymIdx].getName(SymName);

        outs() << SymName << ":\n";
        DILineInfo lastLine;
        for (uint64_t Index = Start; Index < End; Index += Size) {
          MCInst Inst;

          if (DisAsm->getInstruction(Inst, Size, memoryObject, Index,
                                     DebugOut, nulls())) {
            uint64_t SectAddress = 0;
            Sections[SectIdx].getAddress(SectAddress);
            outs() << format("%8" PRIx64 ":\t", SectAddress + Index);

            DumpBytes(StringRef(Bytes.data() + Index, Size));
            IP->printInst(&Inst, outs(), "");

            // Print debug info.
            if (diContext) {
              DILineInfo dli =
                diContext->getLineInfoForAddress(SectAddress + Index);
              // Print valid line info if it changed.
              if (dli != lastLine && dli.getLine() != 0)
                outs() << "\t## " << dli.getFileName() << ':'
                       << dli.getLine() << ':' << dli.getColumn();
              lastLine = dli;
            }
            outs() << "\n";
          } else {
            errs() << "llvm-objdump: warning: invalid instruction encoding\n";
            if (Size == 0)
              Size = 1; // skip illegible bytes
          }
        }
      } else {
        // Create CFG and use it for disassembly.
        StringRef SymName;

//.........这里部分代码省略.........
      SymbolRef::Type ST;
      Symbols[SymIdx].getType(ST);
      if (ST != SymbolRef::ST_Function)
        continue;

      // Make sure the symbol is defined in this section.
      bool containsSym = false;
      Sections[SectIdx].containsSymbol(Symbols[SymIdx], containsSym);
      if (!containsSym)
        continue;

      // Start at the address of the symbol relative to the section's address.
      uint64_t SectionAddress = 0;
      uint64_t Start = 0;
      Sections[SectIdx].getAddress(SectionAddress);
      Symbols[SymIdx].getAddress(Start);
      Start -= SectionAddress;

      // Stop disassembling either at the beginning of the next symbol or at
      // the end of the section.
      bool containsNextSym = false;
      uint64_t NextSym = 0;
      uint64_t NextSymIdx = SymIdx+1;
      while (Symbols.size() > NextSymIdx) {
        SymbolRef::Type NextSymType;
        Symbols[NextSymIdx].getType(NextSymType);
        if (NextSymType == SymbolRef::ST_Function) {
          Sections[SectIdx].containsSymbol(Symbols[NextSymIdx],
                                           containsNextSym);
          Symbols[NextSymIdx].getAddress(NextSym);
          NextSym -= SectionAddress;
          break;
        }
        ++NextSymIdx;
      }

      uint64_t SectSize;
      Sections[SectIdx].getSize(SectSize);
      uint64_t End = containsNextSym ?  NextSym : SectSize;
      uint64_t Size;

      symbolTableWorked = true;

      outs() << SymName << ":\n";
      DILineInfo lastLine;
      for (uint64_t Index = Start; Index < End; Index += Size) {
        MCInst Inst;

        if (DisAsm->getInstruction(Inst, Size, memoryObject, Index,
                                   DebugOut, nulls())) {
          uint64_t SectAddress = 0;
          Sections[SectIdx].getAddress(SectAddress);
          outs() << format("%8" PRIx64 ":\t", SectAddress + Index);

          DumpBytes(StringRef(Bytes.data() + Index, Size));
          IP->printInst(&Inst, outs(), "");

          // Print debug info.
          if (diContext) {
            DILineInfo dli =
              diContext->getLineInfoForAddress(SectAddress + Index);
            // Print valid line info if it changed.
            if (dli != lastLine && dli.getLine() != 0)
              outs() << "\t## " << dli.getFileName() << ':'
                << dli.getLine() << ':' << dli.getColumn();
            lastLine = dli;
          }
          outs() << "\n";
        } else {
          errs() << "llvm-objdump: warning: invalid instruction encoding\n";
          if (Size == 0)
            Size = 1; // skip illegible bytes
        }
      }
    }
    if (!symbolTableWorked) {
      // Reading the symbol table didn't work, disassemble the whole section. 
      uint64_t SectAddress;
      Sections[SectIdx].getAddress(SectAddress);
      uint64_t SectSize;
      Sections[SectIdx].getSize(SectSize);
      uint64_t InstSize;
      for (uint64_t Index = 0; Index < SectSize; Index += InstSize) {
        MCInst Inst;

        if (DisAsm->getInstruction(Inst, InstSize, memoryObject, Index,
                                   DebugOut, nulls())) {
          outs() << format("%8" PRIx64 ":\t", SectAddress + Index);
          DumpBytes(StringRef(Bytes.data() + Index, InstSize));
          IP->printInst(&Inst, outs(), "");
          outs() << "\n";
        } else {
          errs() << "llvm-objdump: warning: invalid instruction encoding\n";
          if (InstSize == 0)
            InstSize = 1; // skip illegible bytes
        }
      }
    }
  }
}