C++ VersionTuple::empty方法代码示例

std::string
MSVCToolChain::ComputeEffectiveClangTriple(const ArgList &Args,
        types::ID InputType) const {
    std::string TripleStr =
        ToolChain::ComputeEffectiveClangTriple(Args, InputType);
    llvm::Triple Triple(TripleStr);
    VersionTuple MSVT =
        tools::visualstudio::getMSVCVersion(/*D=*/nullptr, *this, Triple, Args,
                /*IsWindowsMSVC=*/true);
    if (MSVT.empty())
        return TripleStr;

    MSVT = VersionTuple(MSVT.getMajor(), MSVT.getMinor().getValueOr(0),
                        MSVT.getSubminor().getValueOr(0));

    if (Triple.getEnvironment() == llvm::Triple::MSVC) {
        StringRef ObjFmt = Triple.getEnvironmentName().split('-').second;
        if (ObjFmt.empty())
            Triple.setEnvironmentName((Twine("msvc") + MSVT.getAsString()).str());
        else
            Triple.setEnvironmentName(
                (Twine("msvc") + MSVT.getAsString() + Twine('-') + ObjFmt).str());
    }
    return Triple.getTriple();
}

//.........这里部分代码省略.........

      if (FID.isValid()) {
        if (const FileEntry *FE = SM.getFileEntryForID(FID)) {
          Result << " file=\"";
          appendToResultWithXMLEscaping(FE->getName());
          Result << "\"";
        }
        Result << " line=\"" << SM.getLineNumber(FID, FileOffset)
               << "\" column=\"" << SM.getColumnNumber(FID, FileOffset)
               << "\"";
      }
    }

    // Finish the root tag.
    Result << ">";

    bool FoundName = false;
    if (const NamedDecl *ND = dyn_cast<NamedDecl>(DI->CommentDecl)) {
      if (DeclarationName DeclName = ND->getDeclName()) {
        Result << "<Name>";
        std::string Name = DeclName.getAsString();
        appendToResultWithXMLEscaping(Name);
        FoundName = true;
        Result << "</Name>";
      }
    }
    if (!FoundName)
      Result << "<Name>&lt;anonymous&gt;</Name>";

    {
      // Print USR.
      SmallString<128> USR;
      generateUSRForDecl(DI->CommentDecl, USR);
      if (!USR.empty()) {
        Result << "<USR>";
        appendToResultWithXMLEscaping(USR);
        Result << "</USR>";
      }
    }
  } else {
    // No DeclInfo -- just emit some root tag and name tag.
    RootEndTag = "</Other>";
    Result << "<Other><Name>unknown</Name>";
  }

  if (Parts.Headerfile) {
    Result << "<Headerfile>";
    visit(Parts.Headerfile);
    Result << "</Headerfile>";
  }

  {
    // Pretty-print the declaration.
    Result << "<Declaration>";
    SmallString<128> Declaration;
    getSourceTextOfDeclaration(DI, Declaration);
    formatTextOfDeclaration(DI, Declaration);
    appendToResultWithXMLEscaping(Declaration);
    Result << "</Declaration>";
  }

  bool FirstParagraphIsBrief = false;
  if (Parts.Brief) {
    Result << "<Abstract>";
    visit(Parts.Brief);
    Result << "</Abstract>";

/// \brief Determine the availability of the given declaration based on
/// the target platform.
///
/// When it returns an availability result other than \c AR_Available,
/// if the \p Message parameter is non-NULL, it will be set to a
/// string describing why the entity is unavailable.
///
/// FIXME: Make these strings localizable, since they end up in
/// diagnostics.
static AvailabilityResult CheckAvailability(ASTContext &Context,
                                            const AvailabilityAttr *A,
                                            std::string *Message) {
  StringRef TargetPlatform = Context.getTargetInfo().getPlatformName();
  StringRef PrettyPlatformName
    = AvailabilityAttr::getPrettyPlatformName(TargetPlatform);
  if (PrettyPlatformName.empty())
    PrettyPlatformName = TargetPlatform;

  VersionTuple TargetMinVersion = Context.getTargetInfo().getPlatformMinVersion();
  if (TargetMinVersion.empty())
    return AR_Available;

  // Match the platform name.
  if (A->getPlatform()->getName() != TargetPlatform)
    return AR_Available;
  
  std::string HintMessage;
  if (!A->getMessage().empty()) {
    HintMessage = " - ";
    HintMessage += A->getMessage();
  }
  
  // Make sure that this declaration has not been marked 'unavailable'.
  if (A->getUnavailable()) {
    if (Message) {
      Message->clear();
      llvm::raw_string_ostream Out(*Message);
      Out << "not available on " << PrettyPlatformName 
          << HintMessage;
    }

    return AR_Unavailable;
  }

  // Make sure that this declaration has already been introduced.
  if (!A->getIntroduced().empty() && 
      TargetMinVersion < A->getIntroduced()) {
    if (Message) {
      Message->clear();
      llvm::raw_string_ostream Out(*Message);
      Out << "introduced in " << PrettyPlatformName << ' ' 
          << A->getIntroduced() << HintMessage;
    }

    return AR_NotYetIntroduced;
  }

  // Make sure that this declaration hasn't been obsoleted.
  if (!A->getObsoleted().empty() && TargetMinVersion >= A->getObsoleted()) {
    if (Message) {
      Message->clear();
      llvm::raw_string_ostream Out(*Message);
      Out << "obsoleted in " << PrettyPlatformName << ' ' 
          << A->getObsoleted() << HintMessage;
    }
    
    return AR_Unavailable;
  }

  // Make sure that this declaration hasn't been deprecated.
  if (!A->getDeprecated().empty() && TargetMinVersion >= A->getDeprecated()) {
    if (Message) {
      Message->clear();
      llvm::raw_string_ostream Out(*Message);
      Out << "first deprecated in " << PrettyPlatformName << ' '
          << A->getDeprecated() << HintMessage;
    }
    
    return AR_Deprecated;
  }

  return AR_Available;
}