Mercurial > jdk8-mips64-public > hotspot / file revision

 /*

  * 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