C++ PresumedLoc::isValid方法代码示例

static void getFileAndLine(CodeGenFunction &CGF, SourceLocation Loc,
                           llvm::SmallVectorImpl<llvm::Value*> *Out) {
  PresumedLoc PLoc = CGF.CGM.getContext().getSourceManager().getPresumedLoc(Loc);
  llvm::Constant *File =
    CGF.CGM.GetAddrOfConstantCString(PLoc.isValid()? PLoc.getFilename() : "(unknown)");
  Out->push_back(CGF.Builder.CreateConstInBoundsGEP2_32(File, 0, 0));
  Out->push_back(llvm::ConstantInt::get(CGF.IntTy, PLoc.isValid()? PLoc.getLine() : 0));
}

void TextDiagnostic::emitIncludeLocation(FullSourceLoc Loc, PresumedLoc PLoc) {
  if (DiagOpts->ShowLocation && PLoc.isValid())
    OS << "In file included from " << PLoc.getFilename() << ':'
       << PLoc.getLine() << ":\n";
  else
    OS << "In included file:\n";
}

void TypePrinter::printStructBefore(const StructType *T, raw_ostream &OS) {
  //if (Policy.SuppressTag)
    //return;

  //bool HasKindDecoration = false;

  // We don't print tags unless this is an elaborated type.
  // In C, we just assume every RecordType is an elaborated type.
  //if (!(Policy.LangOpts.CPlusPlus || Policy.SuppressTagKeyword ||
        //D->getTypedefNameForAnonDecl())) {
    //HasKindDecoration = true;
    //OS << D->getKindName();
    //OS << ' ';
  //}

  // Compute the full nested-name-specifier for this type.
  // In C, this will always be empty except when the type
  // being printed is anonymous within other Record.
  //if (!Policy.SuppressScope)
    //AppendScope(D->getDeclContext(), OS);

  //if (const IdentifierInfo *II = D->getIdentifier())
    //OS << II->getName();
  //else if (TypedefNameDecl *Typedef = D->getTypedefNameForAnonDecl()) {
    //assert(Typedef->getIdentifier() && "Typedef without identifier?");
    //OS << Typedef->getIdentifier()->getName();
  //} else {
    // Make an unambiguous representation for anonymous types, e.g.
    //   <anonymous enum at /usr/include/string.h:120:9>
    
    //if (isa<CXXRecordDecl>(D) && cast<CXXRecordDecl>(D)->isLambda()) {
      //OS << "<lambda";
      //HasKindDecoration = true;
    //} else {
      //OS << "<anonymous";
    //}
    
    //if (Policy.AnonymousTagLocations) {
      // Suppress the redundant tag keyword if we just printed one.
      // We don't have to worry about ElaboratedTypes here because you can't
      // refer to an anonymous type with one.
      //if (!HasKindDecoration)
        OS << "<struct";

      PresumedLoc PLoc =
          PresumedLoc::build(T->getDecl()->getASTContext().getSourceManager(),
                             T->getDecl()->getLocation());
      if (PLoc.isValid()) {
        OS << " at " << PLoc.getFilename()
           << ':' << PLoc.getLine()
           << ':' << PLoc.getColumn();
      }
    //}
    
    OS << '>';
  //}

  spaceBeforePlaceHolder(OS);
}

void TextDiagnostic::emitImportLocation(FullSourceLoc Loc, PresumedLoc PLoc,
                                        StringRef ModuleName) {
  if (DiagOpts->ShowLocation && PLoc.isValid())
    OS << "In module '" << ModuleName << "' imported from "
       << PLoc.getFilename() << ':' << PLoc.getLine() << ":\n";
  else
    OS << "In module '" << ModuleName << "':\n";
}

void TextDiagnostic::emitBuildingModuleLocation(SourceLocation Loc,
                                                PresumedLoc PLoc,
                                                StringRef ModuleName,
                                                const SourceManager &SM) {
  if (DiagOpts->ShowLocation && PLoc.isValid())
    OS << "While building module '" << ModuleName << "' imported from "
      << PLoc.getFilename() << ':' << PLoc.getLine() << ":\n";
  else
    OS << "While building module '" << ModuleName << "':\n";
}

llvm::MDNode *SanitizerMetadata::getLocationMetadata(SourceLocation Loc) {
  PresumedLoc PLoc = CGM.getContext().getSourceManager().getPresumedLoc(Loc);
  if (!PLoc.isValid())
    return nullptr;
  llvm::LLVMContext &VMContext = CGM.getLLVMContext();
  llvm::Value *LocMetadata[] = {
      llvm::MDString::get(VMContext, PLoc.getFilename()),
      llvm::ConstantInt::get(llvm::Type::getInt32Ty(VMContext), PLoc.getLine()),
      llvm::ConstantInt::get(llvm::Type::getInt32Ty(VMContext),
                             PLoc.getColumn()),
  };
  return llvm::MDNode::get(VMContext, LocMetadata);
}

void DiagnosticNoteRenderer::emitImportLocation(SourceLocation Loc,
                                                PresumedLoc PLoc,
                                                StringRef ModuleName,
                                                const SourceManager &SM) {
  // Generate a note indicating the include location.
  SmallString<200> MessageStorage;
  llvm::raw_svector_ostream Message(MessageStorage);
  Message << "in module '" << ModuleName;
  if (PLoc.isValid())
    Message << "' imported from " << PLoc.getFilename() << ':'
            << PLoc.getLine();
  Message << ":";
  emitNote(Loc, Message.str(), &SM);
}

static void getInclusions(const SrcMgr::SLocEntry &(SourceManager::*Getter)(unsigned, bool*) const, unsigned n,
                          CXTranslationUnit TU, CXInclusionVisitor CB,
                          CXClientData clientData)
{
  ASTUnit *CXXUnit = cxtu::getASTUnit(TU);
  SourceManager &SM = CXXUnit->getSourceManager();
  ASTContext &Ctx = CXXUnit->getASTContext();
  SmallVector<CXSourceLocation, 10> InclusionStack;
  const bool HasPreamble = SM.getPreambleFileID().isValid();

  for (unsigned i = 0 ; i < n ; ++i) {
    bool Invalid = false;
    const SrcMgr::SLocEntry &SL = (SM.*Getter)(i, &Invalid);

    if (!SL.isFile() || Invalid)
      continue;

    const SrcMgr::FileInfo &FI = SL.getFile();
    if (!FI.getContentCache()->OrigEntry)
      continue;

    // If this is the main file, and there is a preamble, skip this SLoc. The
    // inclusions of the preamble already showed it.
    SourceLocation L = FI.getIncludeLoc();
    if (HasPreamble && CXXUnit->isInMainFileID(L))
      continue;

    // Build the inclusion stack.
    InclusionStack.clear();
    while (L.isValid()) {
      PresumedLoc PLoc = SM.getPresumedLoc(L);
      InclusionStack.push_back(cxloc::translateSourceLocation(Ctx, L));
      L = PLoc.isValid()? PLoc.getIncludeLoc() : SourceLocation();
    }

    // If there is a preamble, the last entry is the "inclusion" of that
    // preamble into the main file, which has the bogus entry of main.c:1:1
    if (HasPreamble && !InclusionStack.empty())
      InclusionStack.pop_back();

    // Callback to the client.
    // FIXME: We should have a function to construct CXFiles.
    CB(static_cast<CXFile>(
         const_cast<FileEntry *>(FI.getContentCache()->OrigEntry)),
       InclusionStack.data(), InclusionStack.size(), clientData);
  }
}

void clang_getInclusions(CXTranslationUnit TU, CXInclusionVisitor CB,
                         CXClientData clientData) {
  
  ASTUnit *CXXUnit = static_cast<ASTUnit *>(TU->TUData);
  SourceManager &SM = CXXUnit->getSourceManager();
  ASTContext &Ctx = CXXUnit->getASTContext();

  llvm::SmallVector<CXSourceLocation, 10> InclusionStack;
  unsigned i = SM.sloc_loaded_entry_size();
  unsigned n =  SM.sloc_entry_size();

  // In the case where all the SLocEntries are in an external source, traverse
  // those SLocEntries as well.  This is the case where we are looking
  // at the inclusion stack of an AST/PCH file.
  if (i >= n)
    i = 0;
  
  for ( ; i < n ; ++i) {

    const SrcMgr::SLocEntry &SL = SM.getSLocEntry(i);
    
    if (!SL.isFile())
      continue;

    const SrcMgr::FileInfo &FI = SL.getFile();
    if (!FI.getContentCache()->OrigEntry)
      continue;
    
    // Build the inclusion stack.
    SourceLocation L = FI.getIncludeLoc();
    InclusionStack.clear();
    while (L.isValid()) {
      PresumedLoc PLoc = SM.getPresumedLoc(L);
      InclusionStack.push_back(cxloc::translateSourceLocation(Ctx, L));
      L = PLoc.isValid()? PLoc.getIncludeLoc() : SourceLocation();
    }
            
    // Callback to the client.
    // FIXME: We should have a function to construct CXFiles.
    CB((CXFile) FI.getContentCache()->OrigEntry, 
       InclusionStack.data(), InclusionStack.size(), clientData);
  }    
}

/// ExpandBuiltinMacro - If an identifier token is read that is to be expanded
/// as a builtin macro, handle it and return the next token as 'Tok'.
void Preprocessor::ExpandBuiltinMacro(Token &Tok) {
  // Figure out which token this is.
  IdentifierInfo *II = Tok.getIdentifierInfo();
  assert(II && "Can't be a macro without id info!");

  // If this is an _Pragma or Microsoft __pragma directive, expand it,
  // invoke the pragma handler, then lex the token after it.
  if (II == Ident_Pragma)
    return Handle_Pragma(Tok);
  else if (II == Ident__pragma) // in non-MS mode this is null
    return HandleMicrosoft__pragma(Tok);

  ++NumBuiltinMacroExpanded;

  llvm::SmallString<128> TmpBuffer;
  llvm::raw_svector_ostream OS(TmpBuffer);

  // Set up the return result.
  Tok.setIdentifierInfo(0);
  Tok.clearFlag(Token::NeedsCleaning);

  if (II == Ident__LINE__) {
    // C99 6.10.8: "__LINE__: The presumed line number (within the current
    // source file) of the current source line (an integer constant)".  This can
    // be affected by #line.
    SourceLocation Loc = Tok.getLocation();

    // Advance to the location of the first _, this might not be the first byte
    // of the token if it starts with an escaped newline.
    Loc = AdvanceToTokenCharacter(Loc, 0);

    // One wrinkle here is that GCC expands __LINE__ to location of the *end* of
    // a macro expansion.  This doesn't matter for object-like macros, but
    // can matter for a function-like macro that expands to contain __LINE__.
    // Skip down through expansion points until we find a file loc for the
    // end of the expansion history.
    Loc = SourceMgr.getExpansionRange(Loc).second;
    PresumedLoc PLoc = SourceMgr.getPresumedLoc(Loc);

    // __LINE__ expands to a simple numeric value.
    OS << (PLoc.isValid()? PLoc.getLine() : 1);
    Tok.setKind(tok::numeric_constant);
  } else if (II == Ident__FILE__ || II == Ident__BASE_FILE__) {
    // C99 6.10.8: "__FILE__: The presumed name of the current source file (a
    // character string literal)". This can be affected by #line.
    PresumedLoc PLoc = SourceMgr.getPresumedLoc(Tok.getLocation());

    // __BASE_FILE__ is a GNU extension that returns the top of the presumed
    // #include stack instead of the current file.
    if (II == Ident__BASE_FILE__ && PLoc.isValid()) {
      SourceLocation NextLoc = PLoc.getIncludeLoc();
      while (NextLoc.isValid()) {
        PLoc = SourceMgr.getPresumedLoc(NextLoc);
        if (PLoc.isInvalid())
          break;
        
        NextLoc = PLoc.getIncludeLoc();
      }
    }

    // Escape this filename.  Turn '\' -> '\\' '"' -> '\"'
    llvm::SmallString<128> FN;
    if (PLoc.isValid()) {
      FN += PLoc.getFilename();
      Lexer::Stringify(FN);
      OS << '"' << FN.str() << '"';
    }
    Tok.setKind(tok::string_literal);
  } else if (II == Ident__DATE__) {
    if (!DATELoc.isValid())
      ComputeDATE_TIME(DATELoc, TIMELoc, *this);
    Tok.setKind(tok::string_literal);
    Tok.setLength(strlen("\"Mmm dd yyyy\""));
    Tok.setLocation(SourceMgr.createExpansionLoc(DATELoc, Tok.getLocation(),
                                                 Tok.getLocation(),
                                                 Tok.getLength()));
    return;
  } else if (II == Ident__TIME__) {
    if (!TIMELoc.isValid())
      ComputeDATE_TIME(DATELoc, TIMELoc, *this);
    Tok.setKind(tok::string_literal);
    Tok.setLength(strlen("\"hh:mm:ss\""));
    Tok.setLocation(SourceMgr.createExpansionLoc(TIMELoc, Tok.getLocation(),
                                                 Tok.getLocation(),
                                                 Tok.getLength()));
    return;
  } else if (II == Ident__INCLUDE_LEVEL__) {
    // Compute the presumed include depth of this token.  This can be affected
    // by GNU line markers.
    unsigned Depth = 0;

    PresumedLoc PLoc = SourceMgr.getPresumedLoc(Tok.getLocation());
    if (PLoc.isValid()) {
      PLoc = SourceMgr.getPresumedLoc(PLoc.getIncludeLoc());
      for (; PLoc.isValid(); ++Depth)
        PLoc = SourceMgr.getPresumedLoc(PLoc.getIncludeLoc());
    }

//.........这里部分代码省略.........

void TypePrinter::printTag(TagDecl *D, raw_ostream &OS) {
  if (Policy.SuppressTag)
    return;

  bool HasKindDecoration = false;

  // bool SuppressTagKeyword
  //   = Policy.LangOpts.CPlusPlus || Policy.SuppressTagKeyword;

  // We don't print tags unless this is an elaborated type.
  // In C, we just assume every RecordType is an elaborated type.
  if (!(Policy.LangOpts.CPlusPlus || Policy.SuppressTagKeyword ||
        D->getTypedefNameForAnonDecl())) {
    HasKindDecoration = true;
    OS << D->getKindName();
    OS << ' ';
  }

  // Compute the full nested-name-specifier for this type.
  // In C, this will always be empty except when the type
  // being printed is anonymous within other Record.
  if (!Policy.SuppressScope)
    AppendScope(D->getDeclContext(), OS);

  if (const IdentifierInfo *II = D->getIdentifier())
    OS << II->getName();
  else if (TypedefNameDecl *Typedef = D->getTypedefNameForAnonDecl()) {
    assert(Typedef->getIdentifier() && "Typedef without identifier?");
    OS << Typedef->getIdentifier()->getName();
  } else {
    // Make an unambiguous representation for anonymous types, e.g.
    //   <anonymous enum at /usr/include/string.h:120:9>
    
    if (isa<CXXRecordDecl>(D) && cast<CXXRecordDecl>(D)->isLambda()) {
      OS << "<lambda";
      HasKindDecoration = true;
    } else {
      OS << "<anonymous";
    }
    
    if (Policy.AnonymousTagLocations) {
      // Suppress the redundant tag keyword if we just printed one.
      // We don't have to worry about ElaboratedTypes here because you can't
      // refer to an anonymous type with one.
      if (!HasKindDecoration)
        OS << " " << D->getKindName();

      PresumedLoc PLoc = D->getASTContext().getSourceManager().getPresumedLoc(
          D->getLocation());
      if (PLoc.isValid()) {
        OS << " at " << PLoc.getFilename()
           << ':' << PLoc.getLine()
           << ':' << PLoc.getColumn();
      }
    }
    
    OS << '>';
  }

  // If this is a class template specialization, print the template
  // arguments.
  if (ClassTemplateSpecializationDecl *Spec
        = dyn_cast<ClassTemplateSpecializationDecl>(D)) {
    const TemplateArgument *Args;
    unsigned NumArgs;
    if (TypeSourceInfo *TAW = Spec->getTypeAsWritten()) {
      const TemplateSpecializationType *TST =
        cast<TemplateSpecializationType>(TAW->getType());
      Args = TST->getArgs();
      NumArgs = TST->getNumArgs();
    } else {
      const TemplateArgumentList &TemplateArgs = Spec->getTemplateArgs();
      Args = TemplateArgs.data();
      NumArgs = TemplateArgs.size();
    }
    IncludeStrongLifetimeRAII Strong(Policy);
    TemplateSpecializationType::PrintTemplateArgumentList(OS,
                                                          Args, NumArgs,
                                                          Policy);
  }

  spaceBeforePlaceHolder(OS);
}

void TextDiagnosticPrinter::HandleDiagnostic(Diagnostic::Level Level,
                                             const DiagnosticInfo &Info) {
  // Default implementation (Warnings/errors count).
  DiagnosticClient::HandleDiagnostic(Level, Info);

  // Keeps track of the the starting position of the location
  // information (e.g., "foo.c:10:4:") that precedes the error
  // message. We use this information to determine how long the
  // file+line+column number prefix is.
  uint64_t StartOfLocationInfo = OS.tell();

  if (!Prefix.empty())
    OS << Prefix << ": ";

  // If the location is specified, print out a file/line/col and include trace
  // if enabled.
  if (Info.getLocation().isValid()) {
    const SourceManager &SM = Info.getSourceManager();
    PresumedLoc PLoc = SM.getPresumedLoc(Info.getLocation());
    if (PLoc.isInvalid()) {
      // At least print the file name if available:
      FileID FID = SM.getFileID(Info.getLocation());
      if (!FID.isInvalid()) {
        const FileEntry* FE = SM.getFileEntryForID(FID);
        if (FE && FE->getName()) {
          OS << FE->getName();
          if (FE->getDevice() == 0 && FE->getInode() == 0
              && FE->getFileMode() == 0) {
            // in PCH is a guess, but a good one:
            OS << " (in PCH)";
          }
          OS << ": ";
        }
      }
    } else {
      unsigned LineNo = PLoc.getLine();

      // First, if this diagnostic is not in the main file, print out the
      // "included from" lines.
      if (LastWarningLoc != PLoc.getIncludeLoc()) {
        LastWarningLoc = PLoc.getIncludeLoc();
        PrintIncludeStack(LastWarningLoc, SM);
        StartOfLocationInfo = OS.tell();
      }

      // Compute the column number.
      if (DiagOpts->ShowLocation && PLoc.isValid()) {
        if (DiagOpts->ShowColors)
          OS.changeColor(savedColor, true);

        // Emit a Visual Studio compatible line number syntax.
        if (LangOpts && LangOpts->Microsoft) {
          OS << PLoc.getFilename() << '(' << LineNo << ')';
          OS << " : ";
        } else {
          OS << PLoc.getFilename() << ':' << LineNo << ':';
          if (DiagOpts->ShowColumn)
            if (unsigned ColNo = PLoc.getColumn())
              OS << ColNo << ':';
        }
        if (DiagOpts->ShowSourceRanges && Info.getNumRanges()) {
          FileID CaretFileID =
            SM.getFileID(SM.getInstantiationLoc(Info.getLocation()));
          bool PrintedRange = false;

          for (unsigned i = 0, e = Info.getNumRanges(); i != e; ++i) {
            // Ignore invalid ranges.
            if (!Info.getRange(i).isValid()) continue;

            SourceLocation B = Info.getRange(i).getBegin();
            SourceLocation E = Info.getRange(i).getEnd();
            B = SM.getInstantiationLoc(B);
            E = SM.getInstantiationLoc(E);

            // If the End location and the start location are the same and are a
            // macro location, then the range was something that came from a
            // macro expansion or _Pragma.  If this is an object-like macro, the
            // best we can do is to highlight the range.  If this is a
            // function-like macro, we'd also like to highlight the arguments.
            if (B == E && Info.getRange(i).getEnd().isMacroID())
              E = SM.getInstantiationRange(Info.getRange(i).getEnd()).second;

            std::pair<FileID, unsigned> BInfo = SM.getDecomposedLoc(B);
            std::pair<FileID, unsigned> EInfo = SM.getDecomposedLoc(E);

            // If the start or end of the range is in another file, just discard
            // it.
            if (BInfo.first != CaretFileID || EInfo.first != CaretFileID)
              continue;

            // Add in the length of the token, so that we cover multi-char
            // tokens.
            unsigned TokSize = 0;
            if (Info.getRange(i).isTokenRange())
              TokSize = Lexer::MeasureTokenLength(E, SM, *LangOpts);

            OS << '{' << SM.getLineNumber(BInfo.first, BInfo.second) << ':'
               << SM.getColumnNumber(BInfo.first, BInfo.second) << '-'
               << SM.getLineNumber(EInfo.first, EInfo.second) << ':'
               << (SM.getColumnNumber(EInfo.first, EInfo.second)+TokSize)
//.........这里部分代码省略.........

/// ExpandBuiltinMacro - If an identifier token is read that is to be expanded
/// as a builtin macro, handle it and return the next token as 'Tok'.
void Preprocessor::ExpandBuiltinMacro(Token &Tok) {
  // Figure out which token this is.
  IdentifierInfo *II = Tok.getIdentifierInfo();
  assert(II && "Can't be a macro without id info!");


  ++NumBuiltinMacroExpanded;

  SmallString<128> TmpBuffer;
  llvm::raw_svector_ostream OS(TmpBuffer);

  // Set up the return result.
  Tok.setIdentifierInfo(nullptr);
  Tok.clearFlag(Token::NeedsCleaning);

  if (II == Ident__LINE__) {
    // C99 6.10.8: "__LINE__: The presumed line number (within the current
    // source file) of the current source line (an integer constant)".  This can
    // be affected by #line.
    SourceLocation Loc = Tok.getLocation();

    // Advance to the location of the first _, this might not be the first byte
    // of the token if it starts with an escaped newline.
    Loc = AdvanceToTokenCharacter(Loc, 0);

    // One wrinkle here is that GCC expands __LINE__ to location of the *end* of
    // a macro expansion.  This doesn't matter for object-like macros, but
    // can matter for a function-like macro that expands to contain __LINE__.
    // Skip down through expansion points until we find a file loc for the
    // end of the expansion history.
    Loc = SourceMgr.getExpansionRange(Loc).getEnd();
    PresumedLoc PLoc = SourceMgr.getPresumedLoc(Loc);

    // __LINE__ expands to a simple numeric value.
    OS << (PLoc.isValid()? PLoc.getLine() : 1);
    Tok.setKind(tok::numeric_constant);
  } else if (II == Ident__FILE__ || II == Ident__BASE_FILE__) {
    // C99 6.10.8: "__FILE__: The presumed name of the current source file (a
    // character string literal)". This can be affected by #line.
    PresumedLoc PLoc = SourceMgr.getPresumedLoc(Tok.getLocation());

    // __BASE_FILE__ is a GNU extension that returns the top of the presumed
    // #include stack instead of the current file.
    if (II == Ident__BASE_FILE__ && PLoc.isValid()) {
      SourceLocation NextLoc = PLoc.getIncludeLoc();
      while (NextLoc.isValid()) {
        PLoc = SourceMgr.getPresumedLoc(NextLoc);
        if (PLoc.isInvalid())
          break;

        NextLoc = PLoc.getIncludeLoc();
      }
    }

    // Escape this filename.  Turn '\' -> '\\' '"' -> '\"'
    SmallString<128> FN;
    if (PLoc.isValid()) {
      FN += PLoc.getFilename();
      Lexer::Stringify(FN);
      OS << '"' << FN << '"';
    }
    Tok.setKind(tok::string_literal);
  } else if (II == Ident__DATE__) {
    Diag(Tok.getLocation(), diag::warn_pp_date_time);
    if (!DATELoc.isValid())
      ComputeDATE_TIME(DATELoc, TIMELoc, *this);
    Tok.setKind(tok::string_literal);
    Tok.setLength(strlen("\"Mmm dd yyyy\""));
    Tok.setLocation(SourceMgr.createExpansionLoc(DATELoc, Tok.getLocation(),
                                                 Tok.getLocation(),
                                                 Tok.getLength()));
    return;
  } else if (II == Ident__TIME__) {
    Diag(Tok.getLocation(), diag::warn_pp_date_time);
    if (!TIMELoc.isValid())
      ComputeDATE_TIME(DATELoc, TIMELoc, *this);
    Tok.setKind(tok::string_literal);
    Tok.setLength(strlen("\"hh:mm:ss\""));
    Tok.setLocation(SourceMgr.createExpansionLoc(TIMELoc, Tok.getLocation(),
                                                 Tok.getLocation(),
                                                 Tok.getLength()));
    return;
  } else if (II == Ident__INCLUDE_LEVEL__) {
    // Compute the presumed include depth of this token.  This can be affected
    // by GNU line markers.
    unsigned Depth = 0;

    PresumedLoc PLoc = SourceMgr.getPresumedLoc(Tok.getLocation());
    if (PLoc.isValid()) {
      PLoc = SourceMgr.getPresumedLoc(PLoc.getIncludeLoc());
      for (; PLoc.isValid(); ++Depth)
        PLoc = SourceMgr.getPresumedLoc(PLoc.getIncludeLoc());
    }

    // __INCLUDE_LEVEL__ expands to a simple numeric value.
    OS << Depth;
    Tok.setKind(tok::numeric_constant);
  } else if (II == Ident__TIMESTAMP__) {
//.........这里部分代码省略.........