1/*
2 * Copyright (c) 1997, 2014, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25#ifndef SHARE_VM_ADLC_FILEBUFF_HPP
26#define SHARE_VM_ADLC_FILEBUFF_HPP
27
28// FILEBUFF.HPP - Definitions for parser file buffering routines
29
30// STRUCTURE FOR HANDLING INPUT AND OUTPUT FILES
31
32class BufferedFile {
33 public:
34  const char *_name;
35  FILE *_fp;
36  inline BufferedFile() { _name = NULL; _fp = NULL; };
37  inline ~BufferedFile() {};
38};
39
40class ArchDesc;
41
42//------------------------------FileBuff--------------------------------------
43// This class defines a nicely behaved buffer of text.  Entire file of text
44// is read into buffer at creation, with sentinels at start and end.
45class FileBuff {
46 private:
47  long  _bufferSize;            // Size of text holding buffer.
48  long  _offset;                // Expected filepointer offset.
49  long  _bufoff;                // Start of buffer file offset
50
51  char *_buf;                   // The buffer itself.
52  char *_bigbuf;                // The buffer plus sentinels; actual heap area
53  char *_bufmax;                // A pointer to the buffer end sentinel
54  char *_bufeol;                // A pointer to the last complete line end
55
56  int   _err;                   // Error flag for file seek/read operations
57  long  _filepos;               // Current offset from start of file
58  int   _linenum;
59
60  ArchDesc& _AD;                // Reference to Architecture Description
61
62  // Error reporting function
63  void file_error(int flag, int linenum, const char *fmt, ...);
64
65 public:
66  const BufferedFile *_fp;           // File to be buffered
67
68  FileBuff(BufferedFile *fp, ArchDesc& archDesc); // Constructor
69  ~FileBuff();                  // Destructor
70
71  // This returns a pointer to the start of the current line in the buffer,
72  // and increments bufeol and filepos to point at the end of that line.
73  char *get_line(void);
74  int linenum() const { return _linenum; }
75  void set_linenum(int line) { _linenum = line; }
76
77  // This converts a pointer into the buffer to a file offset.  It only works
78  // when the pointer is valid (i.e. just obtained from getline()).
79  long getoff(const char* s) { return _bufoff + (long)(s - _buf); }
80};
81#endif // SHARE_VM_ADLC_FILEBUFF_HPP
82