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616915dd | 1 | /* |
11db3170 | 2 | ** Splint - annotation-assisted static program checker |
c59f5181 | 3 | ** Copyright (C) 1994-2003 University of Virginia, |
616915dd | 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 | ** | |
155af98d | 20 | ** For information on splint: info@splint.org |
21 | ** To report a bug: splint-bug@splint.org | |
11db3170 | 22 | ** For more information: http://www.splint.org |
616915dd | 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 | ||
1b8ae690 | 45 | # include "splintMacros.nf" |
b73d1009 | 46 | # include "basic.h" |
616915dd | 47 | # include "signature.h" |
48 | # include "signature2.h" | |
49 | # include "scan.h" | |
50 | # include "scanline.h" | |
51 | ||
616915dd | 52 | static /*@exposed@*/ ltoken LSLScanLookAhead (void); |
28bf4b0b | 53 | static inputStream scanFile; /* file to scan */ |
616915dd | 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 */ | |
a9ec3280 | 64 | /* splint doesn't know the type of YYSTYPE, so we need to ignore warnings here */ |
65 | /*@i1@*/ lval->ltok = LSLScanNextToken (); | |
66 | /*@i1@*/ return (ltoken_getCode (lval->ltok)); | |
616915dd | 67 | } |
68 | ||
69 | ltoken LSLScanNextToken (void) | |
70 | { | |
616915dd | 71 | if (nextToken < lastToken) |
72 | { | |
cd7d9b17 | 73 | ltoken res = TokenList[nextToken]; |
74 | TokenList[nextToken] = ltoken_undefined; | |
75 | nextToken++; | |
76 | /*@-dependenttrans@*/ | |
77 | return res; /* Its the only reference now. */ | |
78 | /*@=dependenttrans@*/ | |
79 | ||
616915dd | 80 | } |
81 | else | |
82 | { | |
83 | lastToken = 0; | |
84 | lineNumber++; | |
85 | ||
28bf4b0b | 86 | line = inputStream_nextLine (scanFile); |
616915dd | 87 | |
88 | if (line != (char *) 0) | |
89 | { | |
28bf4b0b | 90 | lscanLine (line); /* tokenize */ |
616915dd | 91 | nextToken = 0; |
92 | return LSLScanNextToken (); | |
93 | } | |
94 | else | |
95 | { | |
28bf4b0b | 96 | return LSLScanEofToken (); |
616915dd | 97 | } |
98 | } | |
99 | } | |
100 | ||
101 | static /*@exposed@*/ ltoken | |
102 | LSLScanLookAhead (void) | |
103 | { | |
104 | if (nextToken < lastToken) | |
105 | { | |
106 | return TokenList[nextToken]; | |
107 | } | |
108 | else | |
109 | { | |
110 | lastToken = 0; | |
28bf4b0b | 111 | line = inputStream_nextLine (scanFile); |
616915dd | 112 | |
113 | if (line != (char *) 0) | |
114 | { | |
115 | lscanLine (line); | |
116 | nextToken = 0; | |
117 | return LSLScanLookAhead (); | |
118 | } | |
119 | else | |
120 | { | |
121 | /* | |
122 | ** This is a real memory leak. Its only a few bytes | |
123 | ** per file though, and lsl files are hardly ever used. | |
124 | */ | |
125 | ||
126 | /*@-onlytrans@*/ | |
127 | return LSLScanEofToken (); | |
128 | /*@=onlytrans@*/ | |
129 | } | |
130 | } | |
131 | } | |
132 | ||
133 | void | |
134 | LSLScanFreshToken (ltoken tok) | |
135 | { | |
136 | if (lastToken < MAXLINE) | |
137 | { | |
138 | TokenList[lastToken++] = ltoken_copy (tok); | |
139 | } | |
140 | else | |
141 | { | |
142 | llfatalbug (message ("LSLScanFreshToken: out of range: %s", | |
143 | cstring_fromChars (lsymbol_toChars (ltoken_getText (tok))))); | |
144 | } | |
145 | } | |
146 | ||
28bf4b0b | 147 | /*@exposed@*/ inputStream LSLScanSource (void) |
616915dd | 148 | { |
149 | return scanFile; | |
150 | } | |
151 | ||
152 | ||
153 | void | |
154 | LSLScanInit (void) | |
155 | { | |
156 | } | |
157 | ||
158 | void | |
28bf4b0b | 159 | LSLScanReset (inputStream s) |
616915dd | 160 | { |
161 | scanFile = s; | |
162 | lastToken = 0; | |
163 | nextToken = lastToken + 1; /* force call to scanline */ | |
164 | lineNumber = 0; | |
165 | } | |
166 | ||
167 | void | |
168 | LSLScanCleanup (void) | |
169 | { | |
170 | } |