C++ TargetInfo::getTriple方法代码示例

void c2ffi::init_ci(config &c, clang::CompilerInstance &ci) {
    using clang::DiagnosticOptions;
    using clang::TextDiagnosticPrinter;
    using clang::TargetOptions;
    using clang::TargetInfo;

    DiagnosticOptions *dopt = new DiagnosticOptions;
    TextDiagnosticPrinter *tpd =
        new TextDiagnosticPrinter(llvm::errs(), dopt, false);
    ci.createDiagnostics(tpd);

    std::shared_ptr<TargetOptions> pto =
        std::shared_ptr<TargetOptions>(new TargetOptions());
    if(c.arch == "")
        pto->Triple = llvm::sys::getDefaultTargetTriple();
    else
        pto->Triple = c.arch;

    TargetInfo *pti = TargetInfo::CreateTargetInfo(ci.getDiagnostics(), pto);

    clang::LangOptions &lo = ci.getLangOpts();
    switch(pti->getTriple().getEnvironment()) {
        case llvm::Triple::EnvironmentType::GNU:
            lo.GNUMode = 1;
            break;
        case llvm::Triple::EnvironmentType::MSVC:
            lo.MSVCCompat = 1;
            lo.MicrosoftExt = 1;
            break;
        default:
            std::cerr << "c2ffi warning: Unhandled environment: '"
                      << pti->getTriple().getEnvironmentName().str()
                      << "' for triple '" << c.arch
                      << "'" << std::endl;
    }
    ci.getInvocation().setLangDefaults(lo, c.kind, c.std);

    ci.setTarget(pti);
    ci.createFileManager();
    ci.createSourceManager(ci.getFileManager());
    ci.createPreprocessor(clang::TU_Complete);
    ci.getPreprocessorOpts().UsePredefines = false;
    ci.getPreprocessorOutputOpts().ShowCPP = c.preprocess_only;
    ci.getPreprocessor().setPreprocessedOutput(c.preprocess_only);
}

 void CIFactory::SetClingTargetLangOpts(LangOptions& Opts,
                                        const TargetInfo& Target) {
   if (Target.getTriple().getOS() == llvm::Triple::Win32) {
     Opts.MicrosoftExt = 1;
     Opts.MSCVersion = 1300;
     // Should fix http://llvm.org/bugs/show_bug.cgi?id=10528
     Opts.DelayedTemplateParsing = 1;
   } else {
     Opts.MicrosoftExt = 0;
   }
 }

//.........这里部分代码省略.........
  if (LangOpts.NoInlineDefine)
    Builder.defineMacro("__NO_INLINE__");

  if (unsigned PICLevel = LangOpts.PICLevel) {
    Builder.defineMacro("__PIC__", Twine(PICLevel));
    Builder.defineMacro("__pic__", Twine(PICLevel));
  }
  if (unsigned PIELevel = LangOpts.PIELevel) {
    Builder.defineMacro("__PIE__", Twine(PIELevel));
    Builder.defineMacro("__pie__", Twine(PIELevel));
  }

  // Macros to control C99 numerics and <float.h>
  Builder.defineMacro("__FLT_EVAL_METHOD__", Twine(TI.getFloatEvalMethod()));
  Builder.defineMacro("__FLT_RADIX__", "2");
  Builder.defineMacro("__DECIMAL_DIG__", "__LDBL_DECIMAL_DIG__");

  if (LangOpts.getStackProtector() == LangOptions::SSPOn)
    Builder.defineMacro("__SSP__");
  else if (LangOpts.getStackProtector() == LangOptions::SSPStrong)
    Builder.defineMacro("__SSP_STRONG__", "2");
  else if (LangOpts.getStackProtector() == LangOptions::SSPReq)
    Builder.defineMacro("__SSP_ALL__", "3");

  // Define a macro that exists only when using the static analyzer.
  if (FEOpts.ProgramAction == frontend::RunAnalysis)
    Builder.defineMacro("__clang_analyzer__");

  if (LangOpts.FastRelaxedMath)
    Builder.defineMacro("__FAST_RELAXED_MATH__");

  if (FEOpts.ProgramAction == frontend::RewriteObjC ||
      LangOpts.getGC() != LangOptions::NonGC) {
    Builder.defineMacro("__weak", "__attribute__((objc_gc(weak)))");
    Builder.defineMacro("__strong", "__attribute__((objc_gc(strong)))");
    Builder.defineMacro("__autoreleasing", "");
    Builder.defineMacro("__unsafe_unretained", "");
  } else if (LangOpts.ObjC1) {
    Builder.defineMacro("__weak", "__attribute__((objc_ownership(weak)))");
    Builder.defineMacro("__strong", "__attribute__((objc_ownership(strong)))");
    Builder.defineMacro("__autoreleasing",
                        "__attribute__((objc_ownership(autoreleasing)))");
    Builder.defineMacro("__unsafe_unretained",
                        "__attribute__((objc_ownership(none)))");
  }

  // On Darwin, there are __double_underscored variants of the type
  // nullability qualifiers.
  if (TI.getTriple().isOSDarwin()) {
    Builder.defineMacro("__nonnull", "_Nonnull");
    Builder.defineMacro("__null_unspecified", "_Null_unspecified");
    Builder.defineMacro("__nullable", "_Nullable");
  }

  // OpenMP definition
  // OpenMP 2.2:
  //   In implementations that support a preprocessor, the _OPENMP
  //   macro name is defined to have the decimal value yyyymm where
  //   yyyy and mm are the year and the month designations of the
  //   version of the OpenMP API that the implementation support.
  switch (LangOpts.OpenMP) {
  case 0:
    break;
  case 40:
    Builder.defineMacro("_OPENMP", "201307");
    break;
  case 45:
    Builder.defineMacro("_OPENMP", "201511");
    break;
  default:
    // Default version is OpenMP 3.1
    Builder.defineMacro("_OPENMP", "201107");
    break;
  }

  // CUDA device path compilaton
  if (LangOpts.CUDAIsDevice) {
    // The CUDA_ARCH value is set for the GPU target specified in the NVPTX
    // backend's target defines.
    Builder.defineMacro("__CUDA_ARCH__");
  }

  // We need to communicate this to our CUDA header wrapper, which in turn
  // informs the proper CUDA headers of this choice.
  if (LangOpts.CUDADeviceApproxTranscendentals || LangOpts.FastMath) {
    Builder.defineMacro("__CLANG_CUDA_APPROX_TRANSCENDENTALS__");
  }

  // OpenCL definitions.
  if (LangOpts.OpenCL) {
#define OPENCLEXT(Ext) \
    if (TI.getSupportedOpenCLOpts().is_##Ext##_supported( \
        LangOpts.OpenCLVersion)) \
      Builder.defineMacro(#Ext);
#include "clang/Basic/OpenCLExtensions.def"
  }

  // Get other target #defines.
  TI.getTargetDefines(LangOpts, Builder);
}

bool FormatSpecifier::hasValidLengthModifier(const TargetInfo &Target) const {
  switch (LM.getKind()) {
    case LengthModifier::None:
      return true;
      
    // Handle most integer flags
    case LengthModifier::AsShort:
      if (Target.getTriple().isOSMSVCRT()) {
        switch (CS.getKind()) {
          case ConversionSpecifier::cArg:
          case ConversionSpecifier::CArg:
          case ConversionSpecifier::sArg:
          case ConversionSpecifier::SArg:
          case ConversionSpecifier::ZArg:
            return true;
          default:
            break;
        }
      }
      // Fall through.
    case LengthModifier::AsChar:
    case LengthModifier::AsLongLong:
    case LengthModifier::AsQuad:
    case LengthModifier::AsIntMax:
    case LengthModifier::AsSizeT:
    case LengthModifier::AsPtrDiff:
      switch (CS.getKind()) {
        case ConversionSpecifier::dArg:
        case ConversionSpecifier::DArg:
        case ConversionSpecifier::iArg:
        case ConversionSpecifier::oArg:
        case ConversionSpecifier::OArg:
        case ConversionSpecifier::uArg:
        case ConversionSpecifier::UArg:
        case ConversionSpecifier::xArg:
        case ConversionSpecifier::XArg:
        case ConversionSpecifier::nArg:
          return true;
        case ConversionSpecifier::FreeBSDrArg:
        case ConversionSpecifier::FreeBSDyArg:
          return Target.getTriple().isOSFreeBSD();
        default:
          return false;
      }
      
    // Handle 'l' flag
    case LengthModifier::AsLong: // or AsWideChar
      switch (CS.getKind()) {
        case ConversionSpecifier::dArg:
        case ConversionSpecifier::DArg:
        case ConversionSpecifier::iArg:
        case ConversionSpecifier::oArg:
        case ConversionSpecifier::OArg:
        case ConversionSpecifier::uArg:
        case ConversionSpecifier::UArg:
        case ConversionSpecifier::xArg:
        case ConversionSpecifier::XArg:
        case ConversionSpecifier::aArg:
        case ConversionSpecifier::AArg:
        case ConversionSpecifier::fArg:
        case ConversionSpecifier::FArg:
        case ConversionSpecifier::eArg:
        case ConversionSpecifier::EArg:
        case ConversionSpecifier::gArg:
        case ConversionSpecifier::GArg:
        case ConversionSpecifier::nArg:
        case ConversionSpecifier::cArg:
        case ConversionSpecifier::sArg:
        case ConversionSpecifier::ScanListArg:
        case ConversionSpecifier::ZArg:
          return true;
        case ConversionSpecifier::FreeBSDrArg:
        case ConversionSpecifier::FreeBSDyArg:
          return Target.getTriple().isOSFreeBSD();
        default:
          return false;
      }
      
    case LengthModifier::AsLongDouble:
      switch (CS.getKind()) {
        case ConversionSpecifier::aArg:
        case ConversionSpecifier::AArg:
        case ConversionSpecifier::fArg:
        case ConversionSpecifier::FArg:
        case ConversionSpecifier::eArg:
        case ConversionSpecifier::EArg:
        case ConversionSpecifier::gArg:
        case ConversionSpecifier::GArg:
          return true;
        // GNU libc extension.
        case ConversionSpecifier::dArg:
        case ConversionSpecifier::iArg:
        case ConversionSpecifier::oArg:
        case ConversionSpecifier::uArg:
        case ConversionSpecifier::xArg:
        case ConversionSpecifier::XArg:
          return !Target.getTriple().isOSDarwin() &&
                 !Target.getTriple().isOSWindows();
        default:
          return false;
//.........这里部分代码省略.........

//.........这里部分代码省略.........
  ConversionSpecifier::Kind k = ConversionSpecifier::InvalidSpecifier;
  switch (*conversionPosition) {
    default:
      break;
    // C99: 7.19.6.1 (section 8).
    case '%': k = ConversionSpecifier::PercentArg;   break;
    case 'A': k = ConversionSpecifier::AArg; break;
    case 'E': k = ConversionSpecifier::EArg; break;
    case 'F': k = ConversionSpecifier::FArg; break;
    case 'G': k = ConversionSpecifier::GArg; break;
    case 'X': k = ConversionSpecifier::XArg; break;
    case 'a': k = ConversionSpecifier::aArg; break;
    case 'c': k = ConversionSpecifier::cArg; break;
    case 'd': k = ConversionSpecifier::dArg; break;
    case 'e': k = ConversionSpecifier::eArg; break;
    case 'f': k = ConversionSpecifier::fArg; break;
    case 'g': k = ConversionSpecifier::gArg; break;
    case 'i': k = ConversionSpecifier::iArg; break;
    case 'n': k = ConversionSpecifier::nArg; break;
    case 'o': k = ConversionSpecifier::oArg; break;
    case 'p': k = ConversionSpecifier::pArg; break;
    case 's': k = ConversionSpecifier::sArg; break;
    case 'u': k = ConversionSpecifier::uArg; break;
    case 'x': k = ConversionSpecifier::xArg; break;
    // POSIX specific.
    case 'C': k = ConversionSpecifier::CArg; break;
    case 'S': k = ConversionSpecifier::SArg; break;
    // Apple extension for os_log
    case 'P':
      k = ConversionSpecifier::PArg;
      break;
    // Objective-C.
    case '@': k = ConversionSpecifier::ObjCObjArg; break;
    // Glibc specific.
    case 'm': k = ConversionSpecifier::PrintErrno; break;
    // FreeBSD kernel specific.
    case 'b':
      if (isFreeBSDKPrintf)
        k = ConversionSpecifier::FreeBSDbArg; // int followed by char *
      break;
    case 'r':
      if (isFreeBSDKPrintf)
        k = ConversionSpecifier::FreeBSDrArg; // int
      break;
    case 'y':
      if (isFreeBSDKPrintf)
        k = ConversionSpecifier::FreeBSDyArg; // int
      break;
    // Apple-specific.
    case 'D':
      if (isFreeBSDKPrintf)
        k = ConversionSpecifier::FreeBSDDArg; // void * followed by char *
      else if (Target.getTriple().isOSDarwin())
        k = ConversionSpecifier::DArg;
      break;
    case 'O':
      if (Target.getTriple().isOSDarwin())
        k = ConversionSpecifier::OArg;
      break;
    case 'U':
      if (Target.getTriple().isOSDarwin())
        k = ConversionSpecifier::UArg;
      break;
    // MS specific.
    case 'Z':
      if (Target.getTriple().isOSMSVCRT())
        k = ConversionSpecifier::ZArg;
  }
  
  // Check to see if we used the Objective-C modifier flags with
  // a conversion specifier other than '@'.
  if (k != ConversionSpecifier::ObjCObjArg &&
      k != ConversionSpecifier::InvalidSpecifier &&
      ObjCModifierFlagsStart) {
    H.HandleObjCFlagsWithNonObjCConversion(ObjCModifierFlagsStart,
                                           ObjCModifierFlagsEnd + 1,
                                           conversionPosition);
    return true;
  }

  PrintfConversionSpecifier CS(conversionPosition, k);
  FS.setConversionSpecifier(CS);
  if (CS.consumesDataArgument() && !FS.usesPositionalArg())
    FS.setArgIndex(argIndex++);
  // FreeBSD kernel specific.
  if (k == ConversionSpecifier::FreeBSDbArg ||
      k == ConversionSpecifier::FreeBSDDArg)
    argIndex++;

  if (k == ConversionSpecifier::InvalidSpecifier) {
    unsigned Len = I - Start;
    if (ParseUTF8InvalidSpecifier(Start, E, Len)) {
      CS.setEndScanList(Start + Len);
      FS.setConversionSpecifier(CS);
    }
    // Assume the conversion takes one argument.
    return !H.HandleInvalidPrintfConversionSpecifier(FS, Start, Len);
  }
  return PrintfSpecifierResult(Start, FS);
}

//.........这里部分代码省略.........
  if (ParseFieldWidth(H, FS, Start, I, E,
                      FS.usesPositionalArg() ? 0 : &argIndex))
    return true;

  if (I == E) {
    // No more characters left?
    H.HandleIncompleteSpecifier(Start, E - Start);
    return true;
  }

  // Look for the precision (if any).
  if (*I == '.') {
    ++I;
    if (I == E) {
      H.HandleIncompleteSpecifier(Start, E - Start);
      return true;
    }

    if (ParsePrecision(H, FS, Start, I, E,
                       FS.usesPositionalArg() ? 0 : &argIndex))
      return true;

    if (I == E) {
      // No more characters left?
      H.HandleIncompleteSpecifier(Start, E - Start);
      return true;
    }
  }

  // Look for the length modifier.
  if (ParseLengthModifier(FS, I, E, LO) && I == E) {
    // No more characters left?
    H.HandleIncompleteSpecifier(Start, E - Start);
    return true;
  }

  if (*I == '\0') {
    // Detect spurious null characters, which are likely errors.
    H.HandleNullChar(I);
    return true;
  }

  // Finally, look for the conversion specifier.
  const char *conversionPosition = I++;
  ConversionSpecifier::Kind k = ConversionSpecifier::InvalidSpecifier;
  switch (*conversionPosition) {
    default:
      break;
    // C99: 7.19.6.1 (section 8).
    case '%': k = ConversionSpecifier::PercentArg;   break;
    case 'A': k = ConversionSpecifier::AArg; break;
    case 'E': k = ConversionSpecifier::EArg; break;
    case 'F': k = ConversionSpecifier::FArg; break;
    case 'G': k = ConversionSpecifier::GArg; break;
    case 'X': k = ConversionSpecifier::XArg; break;
    case 'a': k = ConversionSpecifier::aArg; break;
    case 'c': k = ConversionSpecifier::cArg; break;
    case 'd': k = ConversionSpecifier::dArg; break;
    case 'e': k = ConversionSpecifier::eArg; break;
    case 'f': k = ConversionSpecifier::fArg; break;
    case 'g': k = ConversionSpecifier::gArg; break;
    case 'i': k = ConversionSpecifier::iArg; break;
    case 'n': k = ConversionSpecifier::nArg; break;
    case 'o': k = ConversionSpecifier::oArg; break;
    case 'p': k = ConversionSpecifier::pArg; break;
    case 's': k = ConversionSpecifier::sArg; break;
    case 'u': k = ConversionSpecifier::uArg; break;
    case 'x': k = ConversionSpecifier::xArg; break;
    // POSIX specific.
    case 'C': k = ConversionSpecifier::CArg; break;
    case 'S': k = ConversionSpecifier::SArg; break;
    // Objective-C.
    case '@': k = ConversionSpecifier::ObjCObjArg; break;
    // Glibc specific.
    case 'm': k = ConversionSpecifier::PrintErrno; break;
    // Apple-specific
    case 'D':
      if (Target.getTriple().isOSDarwin())
        k = ConversionSpecifier::DArg;
      break;
    case 'O':
      if (Target.getTriple().isOSDarwin())
        k = ConversionSpecifier::OArg;
      break;
    case 'U':
      if (Target.getTriple().isOSDarwin())
        k = ConversionSpecifier::UArg;
      break;
  }
  PrintfConversionSpecifier CS(conversionPosition, k);
  FS.setConversionSpecifier(CS);
  if (CS.consumesDataArgument() && !FS.usesPositionalArg())
    FS.setArgIndex(argIndex++);

  if (k == ConversionSpecifier::InvalidSpecifier) {
    // Assume the conversion takes one argument.
    return !H.HandleInvalidPrintfConversionSpecifier(FS, Start, I - Start);
  }
  return PrintfSpecifierResult(Start, FS);
}

//.........这里部分代码省略.........
  }
  
  // Look for '*' flag if it is present.
  if (*I == '*') {
    FS.setSuppressAssignment(I);
    if (++I == E) {
      H.HandleIncompleteSpecifier(Start, E - Start);
      return true;
    }
  }
  
  // Look for the field width (if any).  Unlike printf, this is either
  // a fixed integer or isn't present.
  const OptionalAmount &Amt = lfort::analyze_format_string::ParseAmount(I, E);
  if (Amt.getHowSpecified() != OptionalAmount::NotSpecified) {
    assert(Amt.getHowSpecified() == OptionalAmount::Constant);
    FS.setFieldWidth(Amt);

    if (I == E) {
      // No more characters left?
      H.HandleIncompleteSpecifier(Start, E - Start);
      return true;
    }
  }
  
  // Look for the length modifier.
  if (ParseLengthModifier(FS, I, E, LO, /*scanf=*/true) && I == E) {
      // No more characters left?
    H.HandleIncompleteSpecifier(Start, E - Start);
    return true;
  }
  
  // Detect spurious null characters, which are likely errors.
  if (*I == '\0') {
    H.HandleNullChar(I);
    return true;
  }
  
  // Finally, look for the conversion specifier.
  const char *conversionPosition = I++;
  ScanfConversionSpecifier::Kind k = ScanfConversionSpecifier::InvalidSpecifier;
  switch (*conversionPosition) {
    default:
      break;
    case '%': k = ConversionSpecifier::PercentArg;   break;
    case 'A': k = ConversionSpecifier::AArg; break;
    case 'E': k = ConversionSpecifier::EArg; break;
    case 'F': k = ConversionSpecifier::FArg; break;
    case 'G': k = ConversionSpecifier::GArg; break;
    case 'X': k = ConversionSpecifier::XArg; break;
    case 'a': k = ConversionSpecifier::aArg; break;
    case 'd': k = ConversionSpecifier::dArg; break;
    case 'e': k = ConversionSpecifier::eArg; break;
    case 'f': k = ConversionSpecifier::fArg; break;
    case 'g': k = ConversionSpecifier::gArg; break;
    case 'i': k = ConversionSpecifier::iArg; break;
    case 'n': k = ConversionSpecifier::nArg; break;
    case 'c': k = ConversionSpecifier::cArg; break;
    case 'C': k = ConversionSpecifier::CArg; break;
    case 'S': k = ConversionSpecifier::SArg; break;
    case '[': k = ConversionSpecifier::ScanListArg; break;
    case 'u': k = ConversionSpecifier::uArg; break;
    case 'x': k = ConversionSpecifier::xArg; break;
    case 'o': k = ConversionSpecifier::oArg; break;
    case 's': k = ConversionSpecifier::sArg; break;
    case 'p': k = ConversionSpecifier::pArg; break;
    // Apple extensions
      // Apple-specific
    case 'D':
      if (Target.getTriple().isOSDarwin())
        k = ConversionSpecifier::DArg;
      break;
    case 'O':
      if (Target.getTriple().isOSDarwin())
        k = ConversionSpecifier::OArg;
      break;
    case 'U':
      if (Target.getTriple().isOSDarwin())
        k = ConversionSpecifier::UArg;
      break;
  }
  ScanfConversionSpecifier CS(conversionPosition, k);
  if (k == ScanfConversionSpecifier::ScanListArg) {
    if (ParseScanList(H, CS, I, E))
      return true;
  }
  FS.setConversionSpecifier(CS);
  if (CS.consumesDataArgument() && !FS.getSuppressAssignment()
      && !FS.usesPositionalArg())
    FS.setArgIndex(argIndex++);
  
  // FIXME: '%' and '*' doesn't make sense.  Issue a warning.
  // FIXME: 'ConsumedSoFar' and '*' doesn't make sense.
  
  if (k == ScanfConversionSpecifier::InvalidSpecifier) {
    // Assume the conversion takes one argument.
    return !H.HandleInvalidScanfConversionSpecifier(FS, Beg, I - Beg);
  }
  return ScanfSpecifierResult(Start, FS);
}

//.........这里部分代码省略.........
  ConversionSpecifier::Kind k = ConversionSpecifier::InvalidSpecifier;
  switch (*conversionPosition) {
    default:
      break;
    // C99: 7.19.6.1 (section 8).
    case '%': k = ConversionSpecifier::PercentArg;   break;
    case 'A': k = ConversionSpecifier::AArg; break;
    case 'E': k = ConversionSpecifier::EArg; break;
    case 'F': k = ConversionSpecifier::FArg; break;
    case 'G': k = ConversionSpecifier::GArg; break;
    case 'X': k = ConversionSpecifier::XArg; break;
    case 'a': k = ConversionSpecifier::aArg; break;
    case 'c': k = ConversionSpecifier::cArg; break;
    case 'd': k = ConversionSpecifier::dArg; break;
    case 'e': k = ConversionSpecifier::eArg; break;
    case 'f': k = ConversionSpecifier::fArg; break;
    case 'g': k = ConversionSpecifier::gArg; break;
    case 'i': k = ConversionSpecifier::iArg; break;
    case 'n': k = ConversionSpecifier::nArg; break;
    case 'o': k = ConversionSpecifier::oArg; break;
    case 'p': k = ConversionSpecifier::pArg; break;
    case 's': k = ConversionSpecifier::sArg; break;
    case 'u': k = ConversionSpecifier::uArg; break;
    case 'x': k = ConversionSpecifier::xArg; break;
    // POSIX specific.
    case 'C': k = ConversionSpecifier::CArg; break;
    case 'S': k = ConversionSpecifier::SArg; break;
    // Apple extension for os_log
    case 'P':
      k = ConversionSpecifier::PArg;
      break;
    // Objective-C.
    case '@': k = ConversionSpecifier::ObjCObjArg; break;
    // Glibc specific.
    case 'm': k = ConversionSpecifier::PrintErrno; break;
    // FreeBSD kernel specific.
    case 'b':
      if (isFreeBSDKPrintf)
        k = ConversionSpecifier::FreeBSDbArg; // int followed by char *
      break;
    case 'r':
      if (isFreeBSDKPrintf)
        k = ConversionSpecifier::FreeBSDrArg; // int
      break;
    case 'y':
      if (isFreeBSDKPrintf)
        k = ConversionSpecifier::FreeBSDyArg; // int
      break;
    // Apple-specific.
    case 'D':
      if (isFreeBSDKPrintf)
        k = ConversionSpecifier::FreeBSDDArg; // void * followed by char *
      else if (Target.getTriple().isOSDarwin())
        k = ConversionSpecifier::DArg;
      break;
    case 'O':
      if (Target.getTriple().isOSDarwin())
        k = ConversionSpecifier::OArg;
      break;
    case 'U':
      if (Target.getTriple().isOSDarwin())
        k = ConversionSpecifier::UArg;
      break;
    // MS specific.
    case 'Z':
      if (Target.getTriple().isOSMSVCRT())
        k = ConversionSpecifier::ZArg;
  }
  
  // Check to see if we used the Objective-C modifier flags with
  // a conversion specifier other than '@'.
  if (k != ConversionSpecifier::ObjCObjArg &&
      k != ConversionSpecifier::InvalidSpecifier &&
      ObjCModifierFlagsStart) {
    H.HandleObjCFlagsWithNonObjCConversion(ObjCModifierFlagsStart,
                                           ObjCModifierFlagsEnd + 1,
                                           conversionPosition);
    return true;
  }

  PrintfConversionSpecifier CS(conversionPosition, k);
  FS.setConversionSpecifier(CS);
  if (CS.consumesDataArgument() && !FS.usesPositionalArg())
    FS.setArgIndex(argIndex++);
  // FreeBSD kernel specific.
  if (k == ConversionSpecifier::FreeBSDbArg ||
      k == ConversionSpecifier::FreeBSDDArg)
    argIndex++;

  if (k == ConversionSpecifier::InvalidSpecifier) {
    unsigned Len = I - Start;
    if (ParseUTF8InvalidSpecifier(Start, E, Len)) {
      CS.setEndScanList(Start + Len);
      FS.setConversionSpecifier(CS);
    }
    // Assume the conversion takes one argument.
    return !H.HandleInvalidPrintfConversionSpecifier(FS, Start, Len);
  }
  return PrintfSpecifierResult(Start, FS);
}

int main(int argc, const char **argv, char * const *envp)
{
    // Path
    void *MainAddr = (void*) (intptr_t) GetExecutablePath;
    llvm::sys::Path Path = GetExecutablePath(argv[0]);

    // DiagnosticOptions
    DiagnosticOptions diagnosticOptions;

    // DiagnosticClient
    TextDiagnosticPrinter *DiagClient = new TextDiagnosticPrinter(llvm::outs(), diagnosticOptions);

    // Diagnostic
    llvm::IntrusiveRefCntPtr<DiagnosticIDs> DiagID(new DiagnosticIDs());
    Diagnostic diagnostic(DiagID, DiagClient);


    //DiagnosticOptions DiagOpts;
    //llvm::IntrusiveRefCntPtr<Diagnostic> diagnostic = CompilerInstance::createDiagnostics(DiagOpts, argc, argv);

    // LangOptions
    LangOptions langOptions;
    langOptions.CPlusPlus = 1;
    langOptions.CPlusPlus0x = 1;
    langOptions.Microsoft = 1;
    langOptions.Bool = 1;
    langOptions.Exceptions = 1;
    langOptions.CXXExceptions = 1;
    langOptions.EmitAllDecls = 1;

    // FileManager
    FileSystemOptions fileSystemOptions;
    FileManager fileManager(fileSystemOptions);

    // SourceManager
    SourceManager sourceManager(diagnostic, fileManager);

    // HeadderSearch
    HeaderSearch headerSearch(fileManager);

    // TargetOptions
    TargetOptions targetOptions;
    targetOptions.Triple = llvm::sys::getHostTriple();

    // TargetInfo
    TargetInfo *pTargetInfo =
        TargetInfo::CreateTargetInfo(
            diagnostic,
            targetOptions);

    // HeaderSearchOptions
    HeaderSearchOptions headerSearchOptions;
    ApplyHeaderSearchOptions(
        headerSearch,
        headerSearchOptions,
        langOptions,
        pTargetInfo->getTriple());

    // Preprocessor
    Preprocessor preprocessor(
        diagnostic,
        langOptions,
        *pTargetInfo,
        sourceManager,
        headerSearch);

    // PreprocessorOptions
    PreprocessorOptions preprocessorOptions;
    preprocessorOptions.DetailedRecord = true;
    preprocessor.createPreprocessingRecord();

    // FrontendOptions
    FrontendOptions frontendOptions;


    // InitializePreprocessor
    InitializePreprocessor(
        preprocessor,
        preprocessorOptions,
        headerSearchOptions,
        frontendOptions);

    //preprocessor.SetCommentRetentionState(true, true);

    // Tutorial
    const FileEntry *pFile = fileManager.getFile(
                                 "test.cpp",
                                 true);
    sourceManager.createMainFileID(pFile);


    /*preprocessor.EnterMainSourceFile();
    Token Tok;
    do {
    	preprocessor.Lex(Tok);  // read one token
    	//if (context.diags.hasErrorOccurred())  // stop lexing/pp on error
    	//	break;
    	preprocessor.DumpToken(Tok);  // outputs to cerr
    	std::cerr << std::endl;
    } while (Tok.isNot(tok::eof));*/
//.........这里部分代码省略.........

int main()
{
    //string a;
    //raw_string_ostream ost(a);
    const DiagnosticOptions diagOptions;
    TextDiagnosticPrinter *tdp = 
        new TextDiagnosticPrinter(outs(), diagOptions, true);//, dops);
	LangOptions lang;

    DiagnosticIDs *diagID;
    const llvm::IntrusiveRefCntPtr< DiagnosticIDs > Diags;
	Diagnostic diag(Diags, tdp, false);
    FileSystemOptions fsOptions;
	FileManager fm(fsOptions);
	SourceManager sm(diag, fm);

    //tut3
    HeaderSearchOptions HSOpts;
    HSOpts.AddPath("/usr/include/linux/", frontend::System, false, false, true); // for stddef.h
    HSOpts.AddPath("/usr/lib/gcc/i686-pc-linux-gnu/4.3.4/include/", frontend::System, false, false, true); // for stdarg.h
	HeaderSearch headers(fm);

    TargetOptions tarOptions;
    tarOptions.Triple = LLVM_HOSTTRIPLE;
	TargetInfo *ti = TargetInfo::CreateTargetInfo(diag, tarOptions);

    //tut3
    ApplyHeaderSearchOptions( headers, HSOpts, lang, ti->getTriple());

	Preprocessor pp(diag, lang, *ti, sm, headers);



//tut2---------------------------------------------------------------
    const FileEntry *file = fm.getFile("input01.c");
    sm.createMainFileID(file);
    pp.EnterMainSourceFile();

    Token Tok;

    do {
        pp.Lex(Tok);
        if(diag.hasErrorOccurred())
            break;
        pp.DumpToken(Tok);
        std::cerr << std::endl;
    } while(Tok.isNot(tok::eof));
//end of tut2---------------------------------------------------------------

//tut4---------------------------------------------------------------
    IdentifierTable tab(lang);

    SelectorTable sels;
    Builtin::Context builtins(*ti);
    unsigned size = 0;

    ASTContext ctxt(lang, sm, *ti, tab, sels, builtins, size);
    ASTConsumer consumer;
    CodeCompleteConsumer *codeCompleter;
    MySemaAction sema(pp, ctxt, consumer, false, codeCompleter);

    Parser p(pp, sema);
    p.ParseTranslationUnit();
    tab.PrintStats();
//end of tut4---------------------------------------------------------------

    //DeclSpec DS;
    //Declarator DeclaratorInfo(DS, Declarator::TypeNameContext);
    //sema.ActOnDeclarator(p.getCurScope(), DeclaratorInfo);

	return 0;
}