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 typedef struct {
35 const char *_name;
36 FILE *_fp;
37 } BufferedFile;
38
39 class ArchDesc;
40
41 //------------------------------FileBuff--------------------------------------
42 // This class defines a nicely behaved buffer of text. Entire file of text
43 // is read into buffer at creation, with sentinels at start and end.
44 class FileBuff {
45 friend class FileBuffRegion;
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
82 //------------------------------FileBuffRegion---------------------------------
83 // A buffer region is really a region of some file, specified as a linked list
84 // of offsets and lengths. These regions can be merged; overlapping regions
85 // will coalesce.
86 class FileBuffRegion {
87 public: // Workaround dev-studio friend/private bug
88 FileBuffRegion *_next; // Linked list of regions sorted by offset.
89 private:
90 FileBuff *_bfr; // The Buffer of the file
91 int _offset, _length; // The file area
92 int _sol; // Start of line where the file area starts
93 int _line; // First line of region
94
95 public:
96 FileBuffRegion(FileBuff*, int sol, int line, int offset, int len);
97 ~FileBuffRegion();
98
99 FileBuffRegion *copy(); // Deep copy
100 FileBuffRegion *merge(FileBuffRegion*); // Merge 2 regions; delete input
101
102 void print(ostream&);
103 friend ostream& operator<< (ostream&, FileBuffRegion&);
104 };
105
106 #endif // SHARE_VM_ADLC_FILEBUFF_HPP