1 /*
2 * Copyright (c) 1997, 2010, 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 #include <iostream>
30
31 using namespace std;
32
33 // STRUCTURE FOR HANDLING INPUT AND OUTPUT FILES
34
35 class BufferedFile {
36 public:
37 const char *_name;
38 FILE *_fp;
39 inline BufferedFile() { _name = NULL; _fp = NULL; };
40 inline ~BufferedFile() {};
41 };
42
43 class ArchDesc;
44
45 //------------------------------FileBuff--------------------------------------
46 // This class defines a nicely behaved buffer of text. Entire file of text
47 // is read into buffer at creation, with sentinels at start and end.
48 class FileBuff {
49 friend class FileBuffRegion;
50 private:
51 long _bufferSize; // Size of text holding buffer.
52 long _offset; // Expected filepointer offset.
53 long _bufoff; // Start of buffer file offset
54
55 char *_buf; // The buffer itself.
56 char *_bigbuf; // The buffer plus sentinels; actual heap area
57 char *_bufmax; // A pointer to the buffer end sentinel
58 char *_bufeol; // A pointer to the last complete line end
59
60 int _err; // Error flag for file seek/read operations
61 long _filepos; // Current offset from start of file
62 int _linenum;
63
64 ArchDesc& _AD; // Reference to Architecture Description
65
66 // Error reporting function
67 void file_error(int flag, int linenum, const char *fmt, ...);
68
69 public:
70 const BufferedFile *_fp; // File to be buffered
71
72 FileBuff(BufferedFile *fp, ArchDesc& archDesc); // Constructor
73 ~FileBuff(); // Destructor
74
75 // This returns a pointer to the start of the current line in the buffer,
76 // and increments bufeol and filepos to point at the end of that line.
77 char *get_line(void);
78 int linenum() const { return _linenum; }
79 void set_linenum(int line) { _linenum = line; }
80
81 // This converts a pointer into the buffer to a file offset. It only works
82 // when the pointer is valid (i.e. just obtained from getline()).
83 long getoff(const char* s) { return _bufoff + (long)(s - _buf); }
84 };
85
86 //------------------------------FileBuffRegion---------------------------------
87 // A buffer region is really a region of some file, specified as a linked list
88 // of offsets and lengths. These regions can be merged; overlapping regions
89 // will coalesce.
90 class FileBuffRegion {
91 public: // Workaround dev-studio friend/private bug
92 FileBuffRegion *_next; // Linked list of regions sorted by offset.
93 private:
94 FileBuff *_bfr; // The Buffer of the file
95 int _offset, _length; // The file area
96 int _sol; // Start of line where the file area starts
97 int _line; // First line of region
98
99 public:
100 FileBuffRegion(FileBuff*, int sol, int line, int offset, int len);
101 ~FileBuffRegion();
102
103 FileBuffRegion *copy(); // Deep copy
104 FileBuffRegion *merge(FileBuffRegion*); // Merge 2 regions; delete input
105
106 void print(ostream&);
107 friend ostream& operator<< (ostream&, FileBuffRegion&);
108 };
109
110 #endif // SHARE_VM_ADLC_FILEBUFF_HPP