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1 | /* | |
2 | ** Splint - annotation-assisted static program checker | |
3 | ** Copyright (C) 1994-2002 University of Virginia, | |
4 | ** Massachusetts Institute of Technology | |
5 | ** | |
6 | ** This program is free software; you can redistribute it and/or modify it | |
7 | ** under the terms of the GNU General Public License as published by the | |
8 | ** Free Software Foundation; either version 2 of the License, or (at your | |
9 | ** option) any later version. | |
10 | ** | |
11 | ** This program is distributed in the hope that it will be useful, but | |
12 | ** WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | ** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | ** General Public License for more details. | |
15 | ** | |
16 | ** The GNU General Public License is available from http://www.gnu.org/ or | |
17 | ** the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, | |
18 | ** MA 02111-1307, USA. | |
19 | ** | |
20 | ** For information on splint: splint@cs.virginia.edu | |
21 | ** To report a bug: splint-bug@cs.virginia.edu | |
22 | ** For more information: http://www.splint.org | |
23 | */ | |
24 | /* | |
25 | ** scan.c | |
26 | ** | |
27 | ** Deliver tokens one at a time | |
28 | ** | |
29 | ** METHOD: | |
30 | ** The input arrives via LSLScanFreshToken (). | |
31 | ** The output is reported via LSLScanNextToken (). | |
32 | ** | |
33 | ** The tokens are built in module ScanLine. | |
34 | ** The tokens are delivered from this module. | |
35 | ** Meantimes, they are saved in a static array. | |
36 | ** | |
37 | ** The tokenizing is split off from the delivery of tokens | |
38 | ** to facilitate incremental scanning at a later date. | |
39 | ** The essential is that scanline () can be called or not | |
40 | ** if the input text is dirty or not. Clean lines cause | |
41 | ** tokens to be played out from the saved token list (not | |
42 | ** yet implemented in this version). | |
43 | */ | |
44 | ||
45 | # include "splintMacros.nf" | |
46 | # include "llbasic.h" | |
47 | # include "signature.h" | |
48 | # include "signature2.h" | |
49 | # include "scan.h" | |
50 | # include "scanline.h" | |
51 | ||
52 | static /*@exposed@*/ ltoken LSLScanLookAhead (void); | |
53 | static inputStream scanFile; /* file to scan */ | |
54 | static o_ltoken TokenList[MAXLINE]; /* available tokens */ | |
55 | static int nextToken; /* next available token */ | |
56 | static int lastToken; /* next available slot */ | |
57 | ||
58 | static /*@dependent@*/ /*@null@*/ char *line; /* input text */ | |
59 | static unsigned int lineNumber; /* current line number */ | |
60 | ||
61 | unsigned int lsllex (YYSTYPE *lval) | |
62 | { | |
63 | /* This is important! Bison expects this */ | |
64 | lval->ltok = LSLScanNextToken (); | |
65 | return (ltoken_getCode (lval->ltok)); | |
66 | } | |
67 | ||
68 | ltoken LSLScanNextToken (void) | |
69 | { | |
70 | if (nextToken < lastToken) | |
71 | { | |
72 | ltoken res = TokenList[nextToken]; | |
73 | TokenList[nextToken] = ltoken_undefined; | |
74 | nextToken++; | |
75 | /*@-dependenttrans@*/ | |
76 | return res; /* Its the only reference now. */ | |
77 | /*@=dependenttrans@*/ | |
78 | ||
79 | } | |
80 | else | |
81 | { | |
82 | lastToken = 0; | |
83 | lineNumber++; | |
84 | ||
85 | line = inputStream_nextLine (scanFile); | |
86 | ||
87 | if (line != (char *) 0) | |
88 | { | |
89 | lscanLine (line); /* tokenize */ | |
90 | nextToken = 0; | |
91 | return LSLScanNextToken (); | |
92 | } | |
93 | else | |
94 | { | |
95 | return LSLScanEofToken (); | |
96 | } | |
97 | } | |
98 | } | |
99 | ||
100 | static /*@exposed@*/ ltoken | |
101 | LSLScanLookAhead (void) | |
102 | { | |
103 | if (nextToken < lastToken) | |
104 | { | |
105 | return TokenList[nextToken]; | |
106 | } | |
107 | else | |
108 | { | |
109 | lastToken = 0; | |
110 | line = inputStream_nextLine (scanFile); | |
111 | ||
112 | if (line != (char *) 0) | |
113 | { | |
114 | lscanLine (line); | |
115 | nextToken = 0; | |
116 | return LSLScanLookAhead (); | |
117 | } | |
118 | else | |
119 | { | |
120 | /* | |
121 | ** This is a real memory leak. Its only a few bytes | |
122 | ** per file though, and lsl files are hardly ever used. | |
123 | */ | |
124 | ||
125 | /*@-onlytrans@*/ | |
126 | return LSLScanEofToken (); | |
127 | /*@=onlytrans@*/ | |
128 | } | |
129 | } | |
130 | } | |
131 | ||
132 | void | |
133 | LSLScanFreshToken (ltoken tok) | |
134 | { | |
135 | if (lastToken < MAXLINE) | |
136 | { | |
137 | TokenList[lastToken++] = ltoken_copy (tok); | |
138 | } | |
139 | else | |
140 | { | |
141 | llfatalbug (message ("LSLScanFreshToken: out of range: %s", | |
142 | cstring_fromChars (lsymbol_toChars (ltoken_getText (tok))))); | |
143 | } | |
144 | } | |
145 | ||
146 | /*@exposed@*/ inputStream LSLScanSource (void) | |
147 | { | |
148 | return scanFile; | |
149 | } | |
150 | ||
151 | ||
152 | void | |
153 | LSLScanInit (void) | |
154 | { | |
155 | } | |
156 | ||
157 | void | |
158 | LSLScanReset (inputStream s) | |
159 | { | |
160 | scanFile = s; | |
161 | lastToken = 0; | |
162 | nextToken = lastToken + 1; /* force call to scanline */ | |
163 | lineNumber = 0; | |
164 | } | |
165 | ||
166 | void | |
167 | LSLScanCleanup (void) | |
168 | { | |
169 | } |