/*

 * Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 *

 */

#ifndef SHARE_VM_ADLC_FILEBUFF_HPP

#define SHARE_VM_ADLC_FILEBUFF_HPP

// FILEBUFF.HPP - Definitions for parser file buffering routines

#include <iostream>

using namespace std;

// STRUCTURE FOR HANDLING INPUT AND OUTPUT FILES

typedef struct {

  const char *_name;

  FILE *_fp;

} BufferedFile;

class ArchDesc;

//------------------------------FileBuff--------------------------------------

// This class defines a nicely behaved buffer of text.  Entire file of text

// is read into buffer at creation, with sentinels at start and end.

class FileBuff {

  friend class FileBuffRegion;

 private:

  long  _bufferSize;            // Size of text holding buffer.

  long  _offset;                // Expected filepointer offset.

  long  _bufoff;                // Start of buffer file offset

  char *_buf;                   // The buffer itself.

  char *_bigbuf;                // The buffer plus sentinels; actual heap area

  char *_bufmax;                // A pointer to the buffer end sentinel

  char *_bufeol;                // A pointer to the last complete line end

  int   _err;                   // Error flag for file seek/read operations

  long  _filepos;               // Current offset from start of file

  int   _linenum;

  ArchDesc& _AD;                // Reference to Architecture Description

  // Error reporting function

  void file_error(int flag, int linenum, const char *fmt, ...);

 public:

  const BufferedFile *_fp;           // File to be buffered

  FileBuff(BufferedFile *fp, ArchDesc& archDesc); // Constructor

  ~FileBuff();                  // Destructor

  // This returns a pointer to the start of the current line in the buffer,

  // and increments bufeol and filepos to point at the end of that line.

  char *get_line(void);

  int linenum() const { return _linenum; }

  void set_linenum(int line) { _linenum = line; }

  // This converts a pointer into the buffer to a file offset.  It only works

  // when the pointer is valid (i.e. just obtained from getline()).

  long getoff(const char* s) { return _bufoff + (long)(s - _buf); }

};

//------------------------------FileBuffRegion---------------------------------

// A buffer region is really a region of some file, specified as a linked list

// of offsets and lengths.  These regions can be merged; overlapping regions

// will coalesce.

class FileBuffRegion {

 public:                        // Workaround dev-studio friend/private bug

  FileBuffRegion *_next;        // Linked list of regions sorted by offset.

 private:

  FileBuff       *_bfr;         // The Buffer of the file

  int _offset, _length;         // The file area

  int             _sol;         // Start of line where the file area starts

  int             _line;        // First line of region

 public:

  FileBuffRegion(FileBuff*, int sol, int line, int offset, int len);

  ~FileBuffRegion();

  FileBuffRegion *copy();                   // Deep copy

  FileBuffRegion *merge(FileBuffRegion*); // Merge 2 regions; delete input

  void print(ostream&);

  friend ostream& operator<< (ostream&, FileBuffRegion&);

};

#endif // SHARE_VM_ADLC_FILEBUFF_HPP