path: root/include/clang/Lex/Preprocessor.h

//===--- Preprocessor.h - C Language Family Preprocessor --------*- C++ -*-===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
//  This file defines the Preprocessor interface.
//
//===----------------------------------------------------------------------===//

#ifndef LLVM_CLANG_LEX_PREPROCESSOR_H
#define LLVM_CLANG_LEX_PREPROCESSOR_H

#include "clang/Lex/MacroInfo.h"
#include "clang/Lex/Lexer.h"
#include "clang/Lex/PTHLexer.h"
#include "clang/Lex/PPCallbacks.h"
#include "clang/Lex/TokenLexer.h"
#include "clang/Lex/PTHManager.h"
#include "clang/Basic/Builtins.h"
#include "clang/Basic/Diagnostic.h"
#include "clang/Basic/IdentifierTable.h"
#include "clang/Basic/SourceLocation.h"
#include "llvm/ADT/DenseMap.h"
#include "llvm/ADT/IntrusiveRefCntPtr.h"
#include "llvm/ADT/SmallPtrSet.h"
#include "llvm/ADT/OwningPtr.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/ArrayRef.h"
#include "llvm/Support/Allocator.h"
#include <vector>

namespace clang {

class SourceManager;
class ExternalPreprocessorSource;
class FileManager;
class FileEntry;
class HeaderSearch;
class PragmaNamespace;
class PragmaHandler;
class CommentHandler;
class ScratchBuffer;
class TargetInfo;
class PPCallbacks;
class CodeCompletionHandler;
class DirectoryLookup;
class PreprocessingRecord;
class ModuleLoader;

/// Preprocessor - This object engages in a tight little dance with the lexer to
/// efficiently preprocess tokens.  Lexers know only about tokens within a
/// single source file, and don't know anything about preprocessor-level issues
/// like the #include stack, token expansion, etc.
///
class Preprocessor : public llvm::RefCountedBase<Preprocessor> {
  DiagnosticsEngine        *Diags;
  LangOptions       &Features;
  const TargetInfo  *Target;
  FileManager       &FileMgr;
  SourceManager     &SourceMgr;
  ScratchBuffer     *ScratchBuf;
  HeaderSearch      &HeaderInfo;
  ModuleLoader      &TheModuleLoader;

  /// \brief External source of macros.
  ExternalPreprocessorSource *ExternalSource;


  /// PTH - An optional PTHManager object used for getting tokens from
  ///  a token cache rather than lexing the original source file.
  llvm::OwningPtr<PTHManager> PTH;

  /// BP - A BumpPtrAllocator object used to quickly allocate and release
  ///  objects internal to the Preprocessor.
  llvm::BumpPtrAllocator BP;

  /// Identifiers for builtin macros and other builtins.
  IdentifierInfo *Ident__LINE__, *Ident__FILE__;   // __LINE__, __FILE__
  IdentifierInfo *Ident__DATE__, *Ident__TIME__;   // __DATE__, __TIME__
  IdentifierInfo *Ident__INCLUDE_LEVEL__;          // __INCLUDE_LEVEL__
  IdentifierInfo *Ident__BASE_FILE__;              // __BASE_FILE__
  IdentifierInfo *Ident__TIMESTAMP__;              // __TIMESTAMP__
  IdentifierInfo *Ident__COUNTER__;                // __COUNTER__
  IdentifierInfo *Ident_Pragma, *Ident__pragma;    // _Pragma, __pragma
  IdentifierInfo *Ident__VA_ARGS__;                // __VA_ARGS__
  IdentifierInfo *Ident__has_feature;              // __has_feature
  IdentifierInfo *Ident__has_extension;            // __has_extension
  IdentifierInfo *Ident__has_builtin;              // __has_builtin
  IdentifierInfo *Ident__has_attribute;            // __has_attribute
  IdentifierInfo *Ident__has_include;              // __has_include
  IdentifierInfo *Ident__has_include_next;         // __has_include_next
  IdentifierInfo *Ident__has_warning;              // __has_warning

  SourceLocation DATELoc, TIMELoc;
  unsigned CounterValue;  // Next __COUNTER__ value.

  enum {
    /// MaxIncludeStackDepth - Maximum depth of #includes.
    MaxAllowedIncludeStackDepth =