1 /*
2 * Copyright (c) 1997, 2009, 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.
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23 */
24
25 // FILEBUFF.HPP - Definitions for parser file buffering routines
26 #include <iostream>
27
28 using namespace std;
29
30 // STRUCTURE FOR HANDLING INPUT AND OUTPUT FILES
31 typedef struct {
32 const char *_name;
33 FILE *_fp;
34 } BufferedFile;
35
36 class ArchDesc;
37
38 //------------------------------FileBuff--------------------------------------
39 // This class defines a nicely behaved buffer of text. Entire file of text
40 // is read into buffer at creation, with sentinels at start and end.
41 class FileBuff {
42 friend class FileBuffRegion;
43 private:
44 long _bufferSize; // Size of text holding buffer.
45 long _offset; // Expected filepointer offset.
46 long _bufoff; // Start of buffer file offset
47
48 char *_buf; // The buffer itself.
49 char *_bigbuf; // The buffer plus sentinels; actual heap area
50 char *_bufmax; // A pointer to the buffer end sentinel
51 char *_bufeol; // A pointer to the last complete line end
52
53 int _err; // Error flag for file seek/read operations
54 long _filepos; // Current offset from start of file
55 int _linenum;
56
57 ArchDesc& _AD; // Reference to Architecture Description
58
59 // Error reporting function
60 void file_error(int flag, int linenum, const char *fmt, ...);
61
62 public:
63 const BufferedFile *_fp; // File to be buffered
64
65 FileBuff(BufferedFile *fp, ArchDesc& archDesc); // Constructor
66 ~FileBuff(); // Destructor
67
68 // This returns a pointer to the start of the current line in the buffer,
69 // and increments bufeol and filepos to point at the end of that line.
70 char *get_line(void);
71 int linenum() const { return _linenum; }
72 void set_linenum(int line) { _linenum = line; }
73
74 // This converts a pointer into the buffer to a file offset. It only works
75 // when the pointer is valid (i.e. just obtained from getline()).
76 long getoff(const char* s) { return _bufoff + (long)(s - _buf); }
77 };
78
79 //------------------------------FileBuffRegion---------------------------------
80 // A buffer region is really a region of some file, specified as a linked list
81 // of offsets and lengths. These regions can be merged; overlapping regions
82 // will coalesce.
83 class FileBuffRegion {
84 public: // Workaround dev-studio friend/private bug
85 FileBuffRegion *_next; // Linked list of regions sorted by offset.
86 private:
87 FileBuff *_bfr; // The Buffer of the file
88 int _offset, _length; // The file area
89 int _sol; // Start of line where the file area starts
90 int _line; // First line of region
91
92 public:
93 FileBuffRegion(FileBuff*, int sol, int line, int offset, int len);
94 ~FileBuffRegion();
95
96 FileBuffRegion *copy(); // Deep copy
97 FileBuffRegion *merge(FileBuffRegion*); // Merge 2 regions; delete input
98
99 void print(ostream&);
100 friend ostream& operator<< (ostream&, FileBuffRegion&);
101 };