1 |
/* $Header$ */ |
/* $Header$ */ |
2 |
/* |
/* |
3 |
* DFA routines |
* DFA routines |
4 |
* This file is #included by regexec.c. |
* This file is #included by regexec.c. |
5 |
* |
* |
6 |
* Copyright (c) 1998, 1999 Henry Spencer. All rights reserved. |
* Copyright (c) 1998, 1999 Henry Spencer. All rights reserved. |
7 |
* |
* |
8 |
* Development of this software was funded, in part, by Cray Research Inc., |
* Development of this software was funded, in part, by Cray Research Inc., |
9 |
* UUNET Communications Services Inc., Sun Microsystems Inc., and Scriptics |
* UUNET Communications Services Inc., Sun Microsystems Inc., and Scriptics |
10 |
* Corporation, none of whom are responsible for the results. The author |
* Corporation, none of whom are responsible for the results. The author |
11 |
* thanks all of them. |
* thanks all of them. |
12 |
* |
* |
13 |
* Redistribution and use in source and binary forms -- with or without |
* Redistribution and use in source and binary forms -- with or without |
14 |
* modification -- are permitted for any purpose, provided that |
* modification -- are permitted for any purpose, provided that |
15 |
* redistributions in source form retain this entire copyright notice and |
* redistributions in source form retain this entire copyright notice and |
16 |
* indicate the origin and nature of any modifications. |
* indicate the origin and nature of any modifications. |
17 |
* |
* |
18 |
* I'd appreciate being given credit for this package in the documentation |
* I'd appreciate being given credit for this package in the documentation |
19 |
* of software which uses it, but that is not a requirement. |
* of software which uses it, but that is not a requirement. |
20 |
* |
* |
21 |
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, |
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, |
22 |
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY |
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY |
23 |
* AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL |
* AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL |
24 |
* HENRY SPENCER BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
* HENRY SPENCER BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
25 |
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
26 |
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; |
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; |
27 |
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, |
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, |
28 |
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR |
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR |
29 |
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF |
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF |
30 |
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
31 |
* |
* |
32 |
*/ |
*/ |
33 |
|
|
34 |
/* |
/* |
35 |
- longest - longest-preferred matching engine |
- longest - longest-preferred matching engine |
36 |
^ static chr *longest(struct vars *, struct dfa *, chr *, chr *, int *); |
^ static chr *longest(struct vars *, struct dfa *, chr *, chr *, int *); |
37 |
*/ |
*/ |
38 |
static chr * /* endpoint, or NULL */ |
static chr * /* endpoint, or NULL */ |
39 |
longest(v, d, start, stop, hitstopp) |
longest(v, d, start, stop, hitstopp) |
40 |
struct vars *v; /* used only for debug and exec flags */ |
struct vars *v; /* used only for debug and exec flags */ |
41 |
struct dfa *d; |
struct dfa *d; |
42 |
chr *start; /* where the match should start */ |
chr *start; /* where the match should start */ |
43 |
chr *stop; /* match must end at or before here */ |
chr *stop; /* match must end at or before here */ |
44 |
int *hitstopp; /* record whether hit v->stop, if non-NULL */ |
int *hitstopp; /* record whether hit v->stop, if non-NULL */ |
45 |
{ |
{ |
46 |
chr *cp; |
chr *cp; |
47 |
chr *realstop = (stop == v->stop) ? stop : stop + 1; |
chr *realstop = (stop == v->stop) ? stop : stop + 1; |
48 |
color co; |
color co; |
49 |
struct sset *css; |
struct sset *css; |
50 |
struct sset *ss; |
struct sset *ss; |
51 |
chr *post; |
chr *post; |
52 |
int i; |
int i; |
53 |
struct colormap *cm = d->cm; |
struct colormap *cm = d->cm; |
54 |
|
|
55 |
/* initialize */ |
/* initialize */ |
56 |
css = initialize(v, d, start); |
css = initialize(v, d, start); |
57 |
cp = start; |
cp = start; |
58 |
if (hitstopp != NULL) |
if (hitstopp != NULL) |
59 |
*hitstopp = 0; |
*hitstopp = 0; |
60 |
|
|
61 |
/* startup */ |
/* startup */ |
62 |
FDEBUG(("+++ startup +++\n")); |
FDEBUG(("+++ startup +++\n")); |
63 |
if (cp == v->start) { |
if (cp == v->start) { |
64 |
co = d->cnfa->bos[(v->eflags®_NOTBOL) ? 0 : 1]; |
co = d->cnfa->bos[(v->eflags®_NOTBOL) ? 0 : 1]; |
65 |
FDEBUG(("color %ld\n", (long)co)); |
FDEBUG(("color %ld\n", (long)co)); |
66 |
} else { |
} else { |
67 |
co = GETCOLOR(cm, *(cp - 1)); |
co = GETCOLOR(cm, *(cp - 1)); |
68 |
FDEBUG(("char %c, color %ld\n", (char)*(cp-1), (long)co)); |
FDEBUG(("char %c, color %ld\n", (char)*(cp-1), (long)co)); |
69 |
} |
} |
70 |
css = miss(v, d, css, co, cp, start); |
css = miss(v, d, css, co, cp, start); |
71 |
if (css == NULL) |
if (css == NULL) |
72 |
return NULL; |
return NULL; |
73 |
css->lastseen = cp; |
css->lastseen = cp; |
74 |
|
|
75 |
/* main loop */ |
/* main loop */ |
76 |
if (v->eflags®_FTRACE) |
if (v->eflags®_FTRACE) |
77 |
while (cp < realstop) { |
while (cp < realstop) { |
78 |
FDEBUG(("+++ at c%d +++\n", css - d->ssets)); |
FDEBUG(("+++ at c%d +++\n", css - d->ssets)); |
79 |
co = GETCOLOR(cm, *cp); |
co = GETCOLOR(cm, *cp); |
80 |
FDEBUG(("char %c, color %ld\n", (char)*cp, (long)co)); |
FDEBUG(("char %c, color %ld\n", (char)*cp, (long)co)); |
81 |
ss = css->outs[co]; |
ss = css->outs[co]; |
82 |
if (ss == NULL) { |
if (ss == NULL) { |
83 |
ss = miss(v, d, css, co, cp+1, start); |
ss = miss(v, d, css, co, cp+1, start); |
84 |
if (ss == NULL) |
if (ss == NULL) |
85 |
break; /* NOTE BREAK OUT */ |
break; /* NOTE BREAK OUT */ |
86 |
} |
} |
87 |
cp++; |
cp++; |
88 |
ss->lastseen = cp; |
ss->lastseen = cp; |
89 |
css = ss; |
css = ss; |
90 |
} |
} |
91 |
else |
else |
92 |
while (cp < realstop) { |
while (cp < realstop) { |
93 |
co = GETCOLOR(cm, *cp); |
co = GETCOLOR(cm, *cp); |
94 |
ss = css->outs[co]; |
ss = css->outs[co]; |
95 |
if (ss == NULL) { |
if (ss == NULL) { |
96 |
ss = miss(v, d, css, co, cp+1, start); |
ss = miss(v, d, css, co, cp+1, start); |
97 |
if (ss == NULL) |
if (ss == NULL) |
98 |
break; /* NOTE BREAK OUT */ |
break; /* NOTE BREAK OUT */ |
99 |
} |
} |
100 |
cp++; |
cp++; |
101 |
ss->lastseen = cp; |
ss->lastseen = cp; |
102 |
css = ss; |
css = ss; |
103 |
} |
} |
104 |
|
|
105 |
/* shutdown */ |
/* shutdown */ |
106 |
FDEBUG(("+++ shutdown at c%d +++\n", css - d->ssets)); |
FDEBUG(("+++ shutdown at c%d +++\n", css - d->ssets)); |
107 |
if (cp == v->stop && stop == v->stop) { |
if (cp == v->stop && stop == v->stop) { |
108 |
if (hitstopp != NULL) |
if (hitstopp != NULL) |
109 |
*hitstopp = 1; |
*hitstopp = 1; |
110 |
co = d->cnfa->eos[(v->eflags®_NOTEOL) ? 0 : 1]; |
co = d->cnfa->eos[(v->eflags®_NOTEOL) ? 0 : 1]; |
111 |
FDEBUG(("color %ld\n", (long)co)); |
FDEBUG(("color %ld\n", (long)co)); |
112 |
ss = miss(v, d, css, co, cp, start); |
ss = miss(v, d, css, co, cp, start); |
113 |
/* special case: match ended at eol? */ |
/* special case: match ended at eol? */ |
114 |
if (ss != NULL && (ss->flags&POSTSTATE)) |
if (ss != NULL && (ss->flags&POSTSTATE)) |
115 |
return cp; |
return cp; |
116 |
else if (ss != NULL) |
else if (ss != NULL) |
117 |
ss->lastseen = cp; /* to be tidy */ |
ss->lastseen = cp; /* to be tidy */ |
118 |
} |
} |
119 |
|
|
120 |
/* find last match, if any */ |
/* find last match, if any */ |
121 |
post = d->lastpost; |
post = d->lastpost; |
122 |
for (ss = d->ssets, i = d->nssused; i > 0; ss++, i--) |
for (ss = d->ssets, i = d->nssused; i > 0; ss++, i--) |
123 |
if ((ss->flags&POSTSTATE) && post != ss->lastseen && |
if ((ss->flags&POSTSTATE) && post != ss->lastseen && |
124 |
(post == NULL || post < ss->lastseen)) |
(post == NULL || post < ss->lastseen)) |
125 |
post = ss->lastseen; |
post = ss->lastseen; |
126 |
if (post != NULL) /* found one */ |
if (post != NULL) /* found one */ |
127 |
return post - 1; |
return post - 1; |
128 |
|
|
129 |
return NULL; |
return NULL; |
130 |
} |
} |
131 |
|
|
132 |
/* |
/* |
133 |
- shortest - shortest-preferred matching engine |
- shortest - shortest-preferred matching engine |
134 |
^ static chr *shortest(struct vars *, struct dfa *, chr *, chr *, chr *, |
^ static chr *shortest(struct vars *, struct dfa *, chr *, chr *, chr *, |
135 |
^ chr **, int *); |
^ chr **, int *); |
136 |
*/ |
*/ |
137 |
static chr * /* endpoint, or NULL */ |
static chr * /* endpoint, or NULL */ |
138 |
shortest(v, d, start, min, max, coldp, hitstopp) |
shortest(v, d, start, min, max, coldp, hitstopp) |
139 |
struct vars *v; |
struct vars *v; |
140 |
struct dfa *d; |
struct dfa *d; |
141 |
chr *start; /* where the match should start */ |
chr *start; /* where the match should start */ |
142 |
chr *min; /* match must end at or after here */ |
chr *min; /* match must end at or after here */ |
143 |
chr *max; /* match must end at or before here */ |
chr *max; /* match must end at or before here */ |
144 |
chr **coldp; /* store coldstart pointer here, if nonNULL */ |
chr **coldp; /* store coldstart pointer here, if nonNULL */ |
145 |
int *hitstopp; /* record whether hit v->stop, if non-NULL */ |
int *hitstopp; /* record whether hit v->stop, if non-NULL */ |
146 |
{ |
{ |
147 |
chr *cp; |
chr *cp; |
148 |
chr *realmin = (min == v->stop) ? min : min + 1; |
chr *realmin = (min == v->stop) ? min : min + 1; |
149 |
chr *realmax = (max == v->stop) ? max : max + 1; |
chr *realmax = (max == v->stop) ? max : max + 1; |
150 |
color co; |
color co; |
151 |
struct sset *css; |
struct sset *css; |
152 |
struct sset *ss; |
struct sset *ss; |
153 |
struct colormap *cm = d->cm; |
struct colormap *cm = d->cm; |
154 |
|
|
155 |
/* initialize */ |
/* initialize */ |
156 |
css = initialize(v, d, start); |
css = initialize(v, d, start); |
157 |
cp = start; |
cp = start; |
158 |
if (hitstopp != NULL) |
if (hitstopp != NULL) |
159 |
*hitstopp = 0; |
*hitstopp = 0; |
160 |
|
|
161 |
/* startup */ |
/* startup */ |
162 |
FDEBUG(("--- startup ---\n")); |
FDEBUG(("--- startup ---\n")); |
163 |
if (cp == v->start) { |
if (cp == v->start) { |
164 |
co = d->cnfa->bos[(v->eflags®_NOTBOL) ? 0 : 1]; |
co = d->cnfa->bos[(v->eflags®_NOTBOL) ? 0 : 1]; |
165 |
FDEBUG(("color %ld\n", (long)co)); |
FDEBUG(("color %ld\n", (long)co)); |
166 |
} else { |
} else { |
167 |
co = GETCOLOR(cm, *(cp - 1)); |
co = GETCOLOR(cm, *(cp - 1)); |
168 |
FDEBUG(("char %c, color %ld\n", (char)*(cp-1), (long)co)); |
FDEBUG(("char %c, color %ld\n", (char)*(cp-1), (long)co)); |
169 |
} |
} |
170 |
css = miss(v, d, css, co, cp, start); |
css = miss(v, d, css, co, cp, start); |
171 |
if (css == NULL) |
if (css == NULL) |
172 |
return NULL; |
return NULL; |
173 |
css->lastseen = cp; |
css->lastseen = cp; |
174 |
ss = css; |
ss = css; |
175 |
|
|
176 |
/* main loop */ |
/* main loop */ |
177 |
if (v->eflags®_FTRACE) |
if (v->eflags®_FTRACE) |
178 |
while (cp < realmax) { |
while (cp < realmax) { |
179 |
FDEBUG(("--- at c%d ---\n", css - d->ssets)); |
FDEBUG(("--- at c%d ---\n", css - d->ssets)); |
180 |
co = GETCOLOR(cm, *cp); |
co = GETCOLOR(cm, *cp); |
181 |
FDEBUG(("char %c, color %ld\n", (char)*cp, (long)co)); |
FDEBUG(("char %c, color %ld\n", (char)*cp, (long)co)); |
182 |
ss = css->outs[co]; |
ss = css->outs[co]; |
183 |
if (ss == NULL) { |
if (ss == NULL) { |
184 |
ss = miss(v, d, css, co, cp+1, start); |
ss = miss(v, d, css, co, cp+1, start); |
185 |
if (ss == NULL) |
if (ss == NULL) |
186 |
break; /* NOTE BREAK OUT */ |
break; /* NOTE BREAK OUT */ |
187 |
} |
} |
188 |
cp++; |
cp++; |
189 |
ss->lastseen = cp; |
ss->lastseen = cp; |
190 |
css = ss; |
css = ss; |
191 |
if ((ss->flags&POSTSTATE) && cp >= realmin) |
if ((ss->flags&POSTSTATE) && cp >= realmin) |
192 |
break; /* NOTE BREAK OUT */ |
break; /* NOTE BREAK OUT */ |
193 |
} |
} |
194 |
else |
else |
195 |
while (cp < realmax) { |
while (cp < realmax) { |
196 |
co = GETCOLOR(cm, *cp); |
co = GETCOLOR(cm, *cp); |
197 |
ss = css->outs[co]; |
ss = css->outs[co]; |
198 |
if (ss == NULL) { |
if (ss == NULL) { |
199 |
ss = miss(v, d, css, co, cp+1, start); |
ss = miss(v, d, css, co, cp+1, start); |
200 |
if (ss == NULL) |
if (ss == NULL) |
201 |
break; /* NOTE BREAK OUT */ |
break; /* NOTE BREAK OUT */ |
202 |
} |
} |
203 |
cp++; |
cp++; |
204 |
ss->lastseen = cp; |
ss->lastseen = cp; |
205 |
css = ss; |
css = ss; |
206 |
if ((ss->flags&POSTSTATE) && cp >= realmin) |
if ((ss->flags&POSTSTATE) && cp >= realmin) |
207 |
break; /* NOTE BREAK OUT */ |
break; /* NOTE BREAK OUT */ |
208 |
} |
} |
209 |
|
|
210 |
if (ss == NULL) |
if (ss == NULL) |
211 |
return NULL; |
return NULL; |
212 |
|
|
213 |
if (coldp != NULL) /* report last no-progress state set, if any */ |
if (coldp != NULL) /* report last no-progress state set, if any */ |
214 |
*coldp = lastcold(v, d); |
*coldp = lastcold(v, d); |
215 |
|
|
216 |
if ((ss->flags&POSTSTATE) && cp > min) { |
if ((ss->flags&POSTSTATE) && cp > min) { |
217 |
assert(cp >= realmin); |
assert(cp >= realmin); |
218 |
cp--; |
cp--; |
219 |
} else if (cp == v->stop && max == v->stop) { |
} else if (cp == v->stop && max == v->stop) { |
220 |
co = d->cnfa->eos[(v->eflags®_NOTEOL) ? 0 : 1]; |
co = d->cnfa->eos[(v->eflags®_NOTEOL) ? 0 : 1]; |
221 |
FDEBUG(("color %ld\n", (long)co)); |
FDEBUG(("color %ld\n", (long)co)); |
222 |
ss = miss(v, d, css, co, cp, start); |
ss = miss(v, d, css, co, cp, start); |
223 |
/* match might have ended at eol */ |
/* match might have ended at eol */ |
224 |
if ((ss == NULL || !(ss->flags&POSTSTATE)) && hitstopp != NULL) |
if ((ss == NULL || !(ss->flags&POSTSTATE)) && hitstopp != NULL) |
225 |
*hitstopp = 1; |
*hitstopp = 1; |
226 |
} |
} |
227 |
|
|
228 |
if (ss == NULL || !(ss->flags&POSTSTATE)) |
if (ss == NULL || !(ss->flags&POSTSTATE)) |
229 |
return NULL; |
return NULL; |
230 |
|
|
231 |
return cp; |
return cp; |
232 |
} |
} |
233 |
|
|
234 |
/* |
/* |
235 |
- lastcold - determine last point at which no progress had been made |
- lastcold - determine last point at which no progress had been made |
236 |
^ static chr *lastcold(struct vars *, struct dfa *); |
^ static chr *lastcold(struct vars *, struct dfa *); |
237 |
*/ |
*/ |
238 |
static chr * /* endpoint, or NULL */ |
static chr * /* endpoint, or NULL */ |
239 |
lastcold(v, d) |
lastcold(v, d) |
240 |
struct vars *v; |
struct vars *v; |
241 |
struct dfa *d; |
struct dfa *d; |
242 |
{ |
{ |
243 |
struct sset *ss; |
struct sset *ss; |
244 |
chr *nopr; |
chr *nopr; |
245 |
int i; |
int i; |
246 |
|
|
247 |
nopr = d->lastnopr; |
nopr = d->lastnopr; |
248 |
if (nopr == NULL) |
if (nopr == NULL) |
249 |
nopr = v->start; |
nopr = v->start; |
250 |
for (ss = d->ssets, i = d->nssused; i > 0; ss++, i--) |
for (ss = d->ssets, i = d->nssused; i > 0; ss++, i--) |
251 |
if ((ss->flags&NOPROGRESS) && nopr < ss->lastseen) |
if ((ss->flags&NOPROGRESS) && nopr < ss->lastseen) |
252 |
nopr = ss->lastseen; |
nopr = ss->lastseen; |
253 |
return nopr; |
return nopr; |
254 |
} |
} |
255 |
|
|
256 |
/* |
/* |
257 |
- newdfa - set up a fresh DFA |
- newdfa - set up a fresh DFA |
258 |
^ static struct dfa *newdfa(struct vars *, struct cnfa *, |
^ static struct dfa *newdfa(struct vars *, struct cnfa *, |
259 |
^ struct colormap *, struct smalldfa *); |
^ struct colormap *, struct smalldfa *); |
260 |
*/ |
*/ |
261 |
static struct dfa * |
static struct dfa * |
262 |
newdfa(v, cnfa, cm, small) |
newdfa(v, cnfa, cm, small) |
263 |
struct vars *v; |
struct vars *v; |
264 |
struct cnfa *cnfa; |
struct cnfa *cnfa; |
265 |
struct colormap *cm; |
struct colormap *cm; |
266 |
struct smalldfa *small; /* preallocated space, may be NULL */ |
struct smalldfa *small; /* preallocated space, may be NULL */ |
267 |
{ |
{ |
268 |
struct dfa *d; |
struct dfa *d; |
269 |
size_t nss = cnfa->nstates * 2; |
size_t nss = cnfa->nstates * 2; |
270 |
int wordsper = (cnfa->nstates + UBITS - 1) / UBITS; |
int wordsper = (cnfa->nstates + UBITS - 1) / UBITS; |
271 |
struct smalldfa *smallwas = small; |
struct smalldfa *smallwas = small; |
272 |
|
|
273 |
assert(cnfa != NULL && cnfa->nstates != 0); |
assert(cnfa != NULL && cnfa->nstates != 0); |
274 |
|
|
275 |
if (nss <= FEWSTATES && cnfa->ncolors <= FEWCOLORS) { |
if (nss <= FEWSTATES && cnfa->ncolors <= FEWCOLORS) { |
276 |
assert(wordsper == 1); |
assert(wordsper == 1); |
277 |
if (small == NULL) { |
if (small == NULL) { |
278 |
small = (struct smalldfa *)MALLOC( |
small = (struct smalldfa *)MALLOC( |
279 |
sizeof(struct smalldfa)); |
sizeof(struct smalldfa)); |
280 |
if (small == NULL) { |
if (small == NULL) { |
281 |
ERR(REG_ESPACE); |
ERR(REG_ESPACE); |
282 |
return NULL; |
return NULL; |
283 |
} |
} |
284 |
} |
} |
285 |
d = &small->dfa; |
d = &small->dfa; |
286 |
d->ssets = small->ssets; |
d->ssets = small->ssets; |
287 |
d->statesarea = small->statesarea; |
d->statesarea = small->statesarea; |
288 |
d->work = &d->statesarea[nss]; |
d->work = &d->statesarea[nss]; |
289 |
d->outsarea = small->outsarea; |
d->outsarea = small->outsarea; |
290 |
d->incarea = small->incarea; |
d->incarea = small->incarea; |
291 |
d->cptsmalloced = 0; |
d->cptsmalloced = 0; |
292 |
d->mallocarea = (smallwas == NULL) ? (char *)small : NULL; |
d->mallocarea = (smallwas == NULL) ? (char *)small : NULL; |
293 |
} else { |
} else { |
294 |
d = (struct dfa *)MALLOC(sizeof(struct dfa)); |
d = (struct dfa *)MALLOC(sizeof(struct dfa)); |
295 |
if (d == NULL) { |
if (d == NULL) { |
296 |
ERR(REG_ESPACE); |
ERR(REG_ESPACE); |
297 |
return NULL; |
return NULL; |
298 |
} |
} |
299 |
d->ssets = (struct sset *)MALLOC(nss * sizeof(struct sset)); |
d->ssets = (struct sset *)MALLOC(nss * sizeof(struct sset)); |
300 |
d->statesarea = (unsigned *)MALLOC((nss+WORK) * wordsper * |
d->statesarea = (unsigned *)MALLOC((nss+WORK) * wordsper * |
301 |
sizeof(unsigned)); |
sizeof(unsigned)); |
302 |
d->work = &d->statesarea[nss * wordsper]; |
d->work = &d->statesarea[nss * wordsper]; |
303 |
d->outsarea = (struct sset **)MALLOC(nss * cnfa->ncolors * |
d->outsarea = (struct sset **)MALLOC(nss * cnfa->ncolors * |
304 |
sizeof(struct sset *)); |
sizeof(struct sset *)); |
305 |
d->incarea = (struct arcp *)MALLOC(nss * cnfa->ncolors * |
d->incarea = (struct arcp *)MALLOC(nss * cnfa->ncolors * |
306 |
sizeof(struct arcp)); |
sizeof(struct arcp)); |
307 |
d->cptsmalloced = 1; |
d->cptsmalloced = 1; |
308 |
d->mallocarea = (char *)d; |
d->mallocarea = (char *)d; |
309 |
if (d->ssets == NULL || d->statesarea == NULL || |
if (d->ssets == NULL || d->statesarea == NULL || |
310 |
d->outsarea == NULL || d->incarea == NULL) { |
d->outsarea == NULL || d->incarea == NULL) { |
311 |
freedfa(d); |
freedfa(d); |
312 |
ERR(REG_ESPACE); |
ERR(REG_ESPACE); |
313 |
return NULL; |
return NULL; |
314 |
} |
} |
315 |
} |
} |
316 |
|
|
317 |
d->nssets = (v->eflags®_SMALL) ? 7 : nss; |
d->nssets = (v->eflags®_SMALL) ? 7 : nss; |
318 |
d->nssused = 0; |
d->nssused = 0; |
319 |
d->nstates = cnfa->nstates; |
d->nstates = cnfa->nstates; |
320 |
d->ncolors = cnfa->ncolors; |
d->ncolors = cnfa->ncolors; |
321 |
d->wordsper = wordsper; |
d->wordsper = wordsper; |
322 |
d->cnfa = cnfa; |
d->cnfa = cnfa; |
323 |
d->cm = cm; |
d->cm = cm; |
324 |
d->lastpost = NULL; |
d->lastpost = NULL; |
325 |
d->lastnopr = NULL; |
d->lastnopr = NULL; |
326 |
d->search = d->ssets; |
d->search = d->ssets; |
327 |
|
|
328 |
/* initialization of sset fields is done as needed */ |
/* initialization of sset fields is done as needed */ |
329 |
|
|
330 |
return d; |
return d; |
331 |
} |
} |
332 |
|
|
333 |
/* |
/* |
334 |
- freedfa - free a DFA |
- freedfa - free a DFA |
335 |
^ static VOID freedfa(struct dfa *); |
^ static VOID freedfa(struct dfa *); |
336 |
*/ |
*/ |
337 |
static VOID |
static VOID |
338 |
freedfa(d) |
freedfa(d) |
339 |
struct dfa *d; |
struct dfa *d; |
340 |
{ |
{ |
341 |
if (d->cptsmalloced) { |
if (d->cptsmalloced) { |
342 |
if (d->ssets != NULL) |
if (d->ssets != NULL) |
343 |
FREE(d->ssets); |
FREE(d->ssets); |
344 |
if (d->statesarea != NULL) |
if (d->statesarea != NULL) |
345 |
FREE(d->statesarea); |
FREE(d->statesarea); |
346 |
if (d->outsarea != NULL) |
if (d->outsarea != NULL) |
347 |
FREE(d->outsarea); |
FREE(d->outsarea); |
348 |
if (d->incarea != NULL) |
if (d->incarea != NULL) |
349 |
FREE(d->incarea); |
FREE(d->incarea); |
350 |
} |
} |
351 |
|
|
352 |
if (d->mallocarea != NULL) |
if (d->mallocarea != NULL) |
353 |
FREE(d->mallocarea); |
FREE(d->mallocarea); |
354 |
} |
} |
355 |
|
|
356 |
/* |
/* |
357 |
- hash - construct a hash code for a bitvector |
- hash - construct a hash code for a bitvector |
358 |
* There are probably better ways, but they're more expensive. |
* There are probably better ways, but they're more expensive. |
359 |
^ static unsigned hash(unsigned *, int); |
^ static unsigned hash(unsigned *, int); |
360 |
*/ |
*/ |
361 |
static unsigned |
static unsigned |
362 |
hash(uv, n) |
hash(uv, n) |
363 |
unsigned *uv; |
unsigned *uv; |
364 |
int n; |
int n; |
365 |
{ |
{ |
366 |
int i; |
int i; |
367 |
unsigned h; |
unsigned h; |
368 |
|
|
369 |
h = 0; |
h = 0; |
370 |
for (i = 0; i < n; i++) |
for (i = 0; i < n; i++) |
371 |
h ^= uv[i]; |
h ^= uv[i]; |
372 |
return h; |
return h; |
373 |
} |
} |
374 |
|
|
375 |
/* |
/* |
376 |
- initialize - hand-craft a cache entry for startup, otherwise get ready |
- initialize - hand-craft a cache entry for startup, otherwise get ready |
377 |
^ static struct sset *initialize(struct vars *, struct dfa *, chr *); |
^ static struct sset *initialize(struct vars *, struct dfa *, chr *); |
378 |
*/ |
*/ |
379 |
static struct sset * |
static struct sset * |
380 |
initialize(v, d, start) |
initialize(v, d, start) |
381 |
struct vars *v; /* used only for debug flags */ |
struct vars *v; /* used only for debug flags */ |
382 |
struct dfa *d; |
struct dfa *d; |
383 |
chr *start; |
chr *start; |
384 |
{ |
{ |
385 |
struct sset *ss; |
struct sset *ss; |
386 |
int i; |
int i; |
387 |
|
|
388 |
/* is previous one still there? */ |
/* is previous one still there? */ |
389 |
if (d->nssused > 0 && (d->ssets[0].flags&STARTER)) |
if (d->nssused > 0 && (d->ssets[0].flags&STARTER)) |
390 |
ss = &d->ssets[0]; |
ss = &d->ssets[0]; |
391 |
else { /* no, must (re)build it */ |
else { /* no, must (re)build it */ |
392 |
ss = getvacant(v, d, start, start); |
ss = getvacant(v, d, start, start); |
393 |
for (i = 0; i < d->wordsper; i++) |
for (i = 0; i < d->wordsper; i++) |
394 |
ss->states[i] = 0; |
ss->states[i] = 0; |
395 |
BSET(ss->states, d->cnfa->pre); |
BSET(ss->states, d->cnfa->pre); |
396 |
ss->hash = HASH(ss->states, d->wordsper); |
ss->hash = HASH(ss->states, d->wordsper); |
397 |
assert(d->cnfa->pre != d->cnfa->post); |
assert(d->cnfa->pre != d->cnfa->post); |
398 |
ss->flags = STARTER|LOCKED|NOPROGRESS; |
ss->flags = STARTER|LOCKED|NOPROGRESS; |
399 |
/* lastseen dealt with below */ |
/* lastseen dealt with below */ |
400 |
} |
} |
401 |
|
|
402 |
for (i = 0; i < d->nssused; i++) |
for (i = 0; i < d->nssused; i++) |
403 |
d->ssets[i].lastseen = NULL; |
d->ssets[i].lastseen = NULL; |
404 |
ss->lastseen = start; /* maybe untrue, but harmless */ |
ss->lastseen = start; /* maybe untrue, but harmless */ |
405 |
d->lastpost = NULL; |
d->lastpost = NULL; |
406 |
d->lastnopr = NULL; |
d->lastnopr = NULL; |
407 |
return ss; |
return ss; |
408 |
} |
} |
409 |
|
|
410 |
/* |
/* |
411 |
- miss - handle a cache miss |
- miss - handle a cache miss |
412 |
^ static struct sset *miss(struct vars *, struct dfa *, struct sset *, |
^ static struct sset *miss(struct vars *, struct dfa *, struct sset *, |
413 |
^ pcolor, chr *, chr *); |
^ pcolor, chr *, chr *); |
414 |
*/ |
*/ |
415 |
static struct sset * /* NULL if goes to empty set */ |
static struct sset * /* NULL if goes to empty set */ |
416 |
miss(v, d, css, co, cp, start) |
miss(v, d, css, co, cp, start) |
417 |
struct vars *v; /* used only for debug flags */ |
struct vars *v; /* used only for debug flags */ |
418 |
struct dfa *d; |
struct dfa *d; |
419 |
struct sset *css; |
struct sset *css; |
420 |
pcolor co; |
pcolor co; |
421 |
chr *cp; /* next chr */ |
chr *cp; /* next chr */ |
422 |
chr *start; /* where the attempt got started */ |
chr *start; /* where the attempt got started */ |
423 |
{ |
{ |
424 |
struct cnfa *cnfa = d->cnfa; |
struct cnfa *cnfa = d->cnfa; |
425 |
int i; |
int i; |
426 |
unsigned h; |
unsigned h; |
427 |
struct carc *ca; |
struct carc *ca; |
428 |
struct sset *p; |
struct sset *p; |
429 |
int ispost; |
int ispost; |
430 |
int noprogress; |
int noprogress; |
431 |
int gotstate; |
int gotstate; |
432 |
int dolacons; |
int dolacons; |
433 |
int sawlacons; |
int sawlacons; |
434 |
|
|
435 |
/* for convenience, we can be called even if it might not be a miss */ |
/* for convenience, we can be called even if it might not be a miss */ |
436 |
if (css->outs[co] != NULL) { |
if (css->outs[co] != NULL) { |
437 |
FDEBUG(("hit\n")); |
FDEBUG(("hit\n")); |
438 |
return css->outs[co]; |
return css->outs[co]; |
439 |
} |
} |
440 |
FDEBUG(("miss\n")); |
FDEBUG(("miss\n")); |
441 |
|
|
442 |
/* first, what set of states would we end up in? */ |
/* first, what set of states would we end up in? */ |
443 |
for (i = 0; i < d->wordsper; i++) |
for (i = 0; i < d->wordsper; i++) |
444 |
d->work[i] = 0; |
d->work[i] = 0; |
445 |
ispost = 0; |
ispost = 0; |
446 |
noprogress = 1; |
noprogress = 1; |
447 |
gotstate = 0; |
gotstate = 0; |
448 |
for (i = 0; i < d->nstates; i++) |
for (i = 0; i < d->nstates; i++) |
449 |
if (ISBSET(css->states, i)) |
if (ISBSET(css->states, i)) |
450 |
for (ca = cnfa->states[i]+1; ca->co != COLORLESS; ca++) |
for (ca = cnfa->states[i]+1; ca->co != COLORLESS; ca++) |
451 |
if (ca->co == co) { |
if (ca->co == co) { |
452 |
BSET(d->work, ca->to); |
BSET(d->work, ca->to); |
453 |
gotstate = 1; |
gotstate = 1; |
454 |
if (ca->to == cnfa->post) |
if (ca->to == cnfa->post) |
455 |
ispost = 1; |
ispost = 1; |
456 |
if (!cnfa->states[ca->to]->co) |
if (!cnfa->states[ca->to]->co) |
457 |
noprogress = 0; |
noprogress = 0; |
458 |
FDEBUG(("%d -> %d\n", i, ca->to)); |
FDEBUG(("%d -> %d\n", i, ca->to)); |
459 |
} |
} |
460 |
dolacons = (gotstate) ? (cnfa->flags&HASLACONS) : 0; |
dolacons = (gotstate) ? (cnfa->flags&HASLACONS) : 0; |
461 |
sawlacons = 0; |
sawlacons = 0; |
462 |
while (dolacons) { /* transitive closure */ |
while (dolacons) { /* transitive closure */ |
463 |
dolacons = 0; |
dolacons = 0; |
464 |
for (i = 0; i < d->nstates; i++) |
for (i = 0; i < d->nstates; i++) |
465 |
if (ISBSET(d->work, i)) |
if (ISBSET(d->work, i)) |
466 |
for (ca = cnfa->states[i]+1; ca->co != COLORLESS; |
for (ca = cnfa->states[i]+1; ca->co != COLORLESS; |
467 |
ca++) { |
ca++) { |
468 |
if (ca->co <= cnfa->ncolors) |
if (ca->co <= cnfa->ncolors) |
469 |
continue; /* NOTE CONTINUE */ |
continue; /* NOTE CONTINUE */ |
470 |
sawlacons = 1; |
sawlacons = 1; |
471 |
if (ISBSET(d->work, ca->to)) |
if (ISBSET(d->work, ca->to)) |
472 |
continue; /* NOTE CONTINUE */ |
continue; /* NOTE CONTINUE */ |
473 |
if (!lacon(v, cnfa, cp, ca->co)) |
if (!lacon(v, cnfa, cp, ca->co)) |
474 |
continue; /* NOTE CONTINUE */ |
continue; /* NOTE CONTINUE */ |
475 |
BSET(d->work, ca->to); |
BSET(d->work, ca->to); |
476 |
dolacons = 1; |
dolacons = 1; |
477 |
if (ca->to == cnfa->post) |
if (ca->to == cnfa->post) |
478 |
ispost = 1; |
ispost = 1; |
479 |
if (!cnfa->states[ca->to]->co) |
if (!cnfa->states[ca->to]->co) |
480 |
noprogress = 0; |
noprogress = 0; |
481 |
FDEBUG(("%d :> %d\n", i, ca->to)); |
FDEBUG(("%d :> %d\n", i, ca->to)); |
482 |
} |
} |
483 |
} |
} |
484 |
if (!gotstate) |
if (!gotstate) |
485 |
return NULL; |
return NULL; |
486 |
h = HASH(d->work, d->wordsper); |
h = HASH(d->work, d->wordsper); |
487 |
|
|
488 |
/* next, is that in the cache? */ |
/* next, is that in the cache? */ |
489 |
for (p = d->ssets, i = d->nssused; i > 0; p++, i--) |
for (p = d->ssets, i = d->nssused; i > 0; p++, i--) |
490 |
if (HIT(h, d->work, p, d->wordsper)) { |
if (HIT(h, d->work, p, d->wordsper)) { |
491 |
FDEBUG(("cached c%d\n", p - d->ssets)); |
FDEBUG(("cached c%d\n", p - d->ssets)); |
492 |
break; /* NOTE BREAK OUT */ |
break; /* NOTE BREAK OUT */ |
493 |
} |
} |
494 |
if (i == 0) { /* nope, need a new cache entry */ |
if (i == 0) { /* nope, need a new cache entry */ |
495 |
p = getvacant(v, d, cp, start); |
p = getvacant(v, d, cp, start); |
496 |
assert(p != css); |
assert(p != css); |
497 |
for (i = 0; i < d->wordsper; i++) |
for (i = 0; i < d->wordsper; i++) |
498 |
p->states[i] = d->work[i]; |
p->states[i] = d->work[i]; |
499 |
p->hash = h; |
p->hash = h; |
500 |
p->flags = (ispost) ? POSTSTATE : 0; |
p->flags = (ispost) ? POSTSTATE : 0; |
501 |
if (noprogress) |
if (noprogress) |
502 |
p->flags |= NOPROGRESS; |
p->flags |= NOPROGRESS; |
503 |
/* lastseen to be dealt with by caller */ |
/* lastseen to be dealt with by caller */ |
504 |
} |
} |
505 |
|
|
506 |
if (!sawlacons) { /* lookahead conds. always cache miss */ |
if (!sawlacons) { /* lookahead conds. always cache miss */ |
507 |
FDEBUG(("c%d[%d]->c%d\n", css - d->ssets, co, p - d->ssets)); |
FDEBUG(("c%d[%d]->c%d\n", css - d->ssets, co, p - d->ssets)); |
508 |
css->outs[co] = p; |
css->outs[co] = p; |
509 |
css->inchain[co] = p->ins; |
css->inchain[co] = p->ins; |
510 |
p->ins.ss = css; |
p->ins.ss = css; |
511 |
p->ins.co = (color)co; |
p->ins.co = (color)co; |
512 |
} |
} |
513 |
return p; |
return p; |
514 |
} |
} |
515 |
|
|
516 |
/* |
/* |
517 |
- lacon - lookahead-constraint checker for miss() |
- lacon - lookahead-constraint checker for miss() |
518 |
^ static int lacon(struct vars *, struct cnfa *, chr *, pcolor); |
^ static int lacon(struct vars *, struct cnfa *, chr *, pcolor); |
519 |
*/ |
*/ |
520 |
static int /* predicate: constraint satisfied? */ |
static int /* predicate: constraint satisfied? */ |
521 |
lacon(v, pcnfa, cp, co) |
lacon(v, pcnfa, cp, co) |
522 |
struct vars *v; |
struct vars *v; |
523 |
struct cnfa *pcnfa; /* parent cnfa */ |
struct cnfa *pcnfa; /* parent cnfa */ |
524 |
chr *cp; |
chr *cp; |
525 |
pcolor co; /* "color" of the lookahead constraint */ |
pcolor co; /* "color" of the lookahead constraint */ |
526 |
{ |
{ |
527 |
int n; |
int n; |
528 |
struct subre *sub; |
struct subre *sub; |
529 |
struct dfa *d; |
struct dfa *d; |
530 |
struct smalldfa sd; |
struct smalldfa sd; |
531 |
chr *end; |
chr *end; |
532 |
|
|
533 |
n = co - pcnfa->ncolors; |
n = co - pcnfa->ncolors; |
534 |
assert(n < v->g->nlacons && v->g->lacons != NULL); |
assert(n < v->g->nlacons && v->g->lacons != NULL); |
535 |
FDEBUG(("=== testing lacon %d\n", n)); |
FDEBUG(("=== testing lacon %d\n", n)); |
536 |
sub = &v->g->lacons[n]; |
sub = &v->g->lacons[n]; |
537 |
d = newdfa(v, &sub->cnfa, &v->g->cmap, &sd); |
d = newdfa(v, &sub->cnfa, &v->g->cmap, &sd); |
538 |
if (d == NULL) { |
if (d == NULL) { |
539 |
ERR(REG_ESPACE); |
ERR(REG_ESPACE); |
540 |
return 0; |
return 0; |
541 |
} |
} |
542 |
end = longest(v, d, cp, v->stop, (int *)NULL); |
end = longest(v, d, cp, v->stop, (int *)NULL); |
543 |
freedfa(d); |
freedfa(d); |
544 |
FDEBUG(("=== lacon %d match %d\n", n, (end != NULL))); |
FDEBUG(("=== lacon %d match %d\n", n, (end != NULL))); |
545 |
return (sub->subno) ? (end != NULL) : (end == NULL); |
return (sub->subno) ? (end != NULL) : (end == NULL); |
546 |
} |
} |
547 |
|
|
548 |
/* |
/* |
549 |
- getvacant - get a vacant state set |
- getvacant - get a vacant state set |
550 |
* This routine clears out the inarcs and outarcs, but does not otherwise |
* This routine clears out the inarcs and outarcs, but does not otherwise |
551 |
* clear the innards of the state set -- that's up to the caller. |
* clear the innards of the state set -- that's up to the caller. |
552 |
^ static struct sset *getvacant(struct vars *, struct dfa *, chr *, chr *); |
^ static struct sset *getvacant(struct vars *, struct dfa *, chr *, chr *); |
553 |
*/ |
*/ |
554 |
static struct sset * |
static struct sset * |
555 |
getvacant(v, d, cp, start) |
getvacant(v, d, cp, start) |
556 |
struct vars *v; /* used only for debug flags */ |
struct vars *v; /* used only for debug flags */ |
557 |
struct dfa *d; |
struct dfa *d; |
558 |
chr *cp; |
chr *cp; |
559 |
chr *start; |
chr *start; |
560 |
{ |
{ |
561 |
int i; |
int i; |
562 |
struct sset *ss; |
struct sset *ss; |
563 |
struct sset *p; |
struct sset *p; |
564 |
struct arcp ap; |
struct arcp ap; |
565 |
struct arcp lastap; |
struct arcp lastap; |
566 |
color co; |
color co; |
567 |
|
|
568 |
ss = pickss(v, d, cp, start); |
ss = pickss(v, d, cp, start); |
569 |
assert(!(ss->flags&LOCKED)); |
assert(!(ss->flags&LOCKED)); |
570 |
|
|
571 |
/* clear out its inarcs, including self-referential ones */ |
/* clear out its inarcs, including self-referential ones */ |
572 |
ap = ss->ins; |
ap = ss->ins; |
573 |
while ((p = ap.ss) != NULL) { |
while ((p = ap.ss) != NULL) { |
574 |
co = ap.co; |
co = ap.co; |
575 |
FDEBUG(("zapping c%d's %ld outarc\n", p - d->ssets, (long)co)); |
FDEBUG(("zapping c%d's %ld outarc\n", p - d->ssets, (long)co)); |
576 |
p->outs[co] = NULL; |
p->outs[co] = NULL; |
577 |
ap = p->inchain[co]; |
ap = p->inchain[co]; |
578 |
p->inchain[co].ss = NULL; /* paranoia */ |
p->inchain[co].ss = NULL; /* paranoia */ |
579 |
} |
} |
580 |
ss->ins.ss = NULL; |
ss->ins.ss = NULL; |
581 |
|
|
582 |
/* take it off the inarc chains of the ssets reached by its outarcs */ |
/* take it off the inarc chains of the ssets reached by its outarcs */ |
583 |
for (i = 0; i < d->ncolors; i++) { |
for (i = 0; i < d->ncolors; i++) { |
584 |
p = ss->outs[i]; |
p = ss->outs[i]; |
585 |
assert(p != ss); /* not self-referential */ |
assert(p != ss); /* not self-referential */ |
586 |
if (p == NULL) |
if (p == NULL) |
587 |
continue; /* NOTE CONTINUE */ |
continue; /* NOTE CONTINUE */ |
588 |
FDEBUG(("del outarc %d from c%d's in chn\n", i, p - d->ssets)); |
FDEBUG(("del outarc %d from c%d's in chn\n", i, p - d->ssets)); |
589 |
if (p->ins.ss == ss && p->ins.co == i) |
if (p->ins.ss == ss && p->ins.co == i) |
590 |
p->ins = ss->inchain[i]; |
p->ins = ss->inchain[i]; |
591 |
else { |
else { |
592 |
assert(p->ins.ss != NULL); |
assert(p->ins.ss != NULL); |
593 |
for (ap = p->ins; ap.ss != NULL && |
for (ap = p->ins; ap.ss != NULL && |
594 |
!(ap.ss == ss && ap.co == i); |
!(ap.ss == ss && ap.co == i); |
595 |
ap = ap.ss->inchain[ap.co]) |
ap = ap.ss->inchain[ap.co]) |
596 |
lastap = ap; |
lastap = ap; |
597 |
assert(ap.ss != NULL); |
assert(ap.ss != NULL); |
598 |
lastap.ss->inchain[lastap.co] = ss->inchain[i]; |
lastap.ss->inchain[lastap.co] = ss->inchain[i]; |
599 |
} |
} |
600 |
ss->outs[i] = NULL; |
ss->outs[i] = NULL; |
601 |
ss->inchain[i].ss = NULL; |
ss->inchain[i].ss = NULL; |
602 |
} |
} |
603 |
|
|
604 |
/* if ss was a success state, may need to remember location */ |
/* if ss was a success state, may need to remember location */ |
605 |
if ((ss->flags&POSTSTATE) && ss->lastseen != d->lastpost && |
if ((ss->flags&POSTSTATE) && ss->lastseen != d->lastpost && |
606 |
(d->lastpost == NULL || d->lastpost < ss->lastseen)) |
(d->lastpost == NULL || d->lastpost < ss->lastseen)) |
607 |
d->lastpost = ss->lastseen; |
d->lastpost = ss->lastseen; |
608 |
|
|
609 |
/* likewise for a no-progress state */ |
/* likewise for a no-progress state */ |
610 |
if ((ss->flags&NOPROGRESS) && ss->lastseen != d->lastnopr && |
if ((ss->flags&NOPROGRESS) && ss->lastseen != d->lastnopr && |
611 |
(d->lastnopr == NULL || d->lastnopr < ss->lastseen)) |
(d->lastnopr == NULL || d->lastnopr < ss->lastseen)) |
612 |
d->lastnopr = ss->lastseen; |
d->lastnopr = ss->lastseen; |
613 |
|
|
614 |
return ss; |
return ss; |
615 |
} |
} |
616 |
|
|
617 |
/* |
/* |
618 |
- pickss - pick the next stateset to be used |
- pickss - pick the next stateset to be used |
619 |
^ static struct sset *pickss(struct vars *, struct dfa *, chr *, chr *); |
^ static struct sset *pickss(struct vars *, struct dfa *, chr *, chr *); |
620 |
*/ |
*/ |
621 |
static struct sset * |
static struct sset * |
622 |
pickss(v, d, cp, start) |
pickss(v, d, cp, start) |
623 |
struct vars *v; /* used only for debug flags */ |
struct vars *v; /* used only for debug flags */ |
624 |
struct dfa *d; |
struct dfa *d; |
625 |
chr *cp; |
chr *cp; |
626 |
chr *start; |
chr *start; |
627 |
{ |
{ |
628 |
int i; |
int i; |
629 |
struct sset *ss; |
struct sset *ss; |
630 |
struct sset *end; |
struct sset *end; |
631 |
chr *ancient; |
chr *ancient; |
632 |
|
|
633 |
/* shortcut for cases where cache isn't full */ |
/* shortcut for cases where cache isn't full */ |
634 |
if (d->nssused < d->nssets) { |
if (d->nssused < d->nssets) { |
635 |
i = d->nssused; |
i = d->nssused; |
636 |
d->nssused++; |
d->nssused++; |
637 |
ss = &d->ssets[i]; |
ss = &d->ssets[i]; |
638 |
FDEBUG(("new c%d\n", i)); |
FDEBUG(("new c%d\n", i)); |
639 |
/* set up innards */ |
/* set up innards */ |
640 |
ss->states = &d->statesarea[i * d->wordsper]; |
ss->states = &d->statesarea[i * d->wordsper]; |
641 |
ss->flags = 0; |
ss->flags = 0; |
642 |
ss->ins.ss = NULL; |
ss->ins.ss = NULL; |
643 |
ss->ins.co = WHITE; /* give it some value */ |
ss->ins.co = WHITE; /* give it some value */ |
644 |
ss->outs = &d->outsarea[i * d->ncolors]; |
ss->outs = &d->outsarea[i * d->ncolors]; |
645 |
ss->inchain = &d->incarea[i * d->ncolors]; |
ss->inchain = &d->incarea[i * d->ncolors]; |
646 |
for (i = 0; i < d->ncolors; i++) { |
for (i = 0; i < d->ncolors; i++) { |
647 |
ss->outs[i] = NULL; |
ss->outs[i] = NULL; |
648 |
ss->inchain[i].ss = NULL; |
ss->inchain[i].ss = NULL; |
649 |
} |
} |
650 |
return ss; |
return ss; |
651 |
} |
} |
652 |
|
|
653 |
/* look for oldest, or old enough anyway */ |
/* look for oldest, or old enough anyway */ |
654 |
if (cp - start > d->nssets*2/3) /* oldest 33% are expendable */ |
if (cp - start > d->nssets*2/3) /* oldest 33% are expendable */ |
655 |
ancient = cp - d->nssets*2/3; |
ancient = cp - d->nssets*2/3; |
656 |
else |
else |
657 |
ancient = start; |
ancient = start; |
658 |
for (ss = d->search, end = &d->ssets[d->nssets]; ss < end; ss++) |
for (ss = d->search, end = &d->ssets[d->nssets]; ss < end; ss++) |
659 |
if ((ss->lastseen == NULL || ss->lastseen < ancient) && |
if ((ss->lastseen == NULL || ss->lastseen < ancient) && |
660 |
!(ss->flags&LOCKED)) { |
!(ss->flags&LOCKED)) { |
661 |
d->search = ss + 1; |
d->search = ss + 1; |
662 |
FDEBUG(("replacing c%d\n", ss - d->ssets)); |
FDEBUG(("replacing c%d\n", ss - d->ssets)); |
663 |
return ss; |
return ss; |
664 |
} |
} |
665 |
for (ss = d->ssets, end = d->search; ss < end; ss++) |
for (ss = d->ssets, end = d->search; ss < end; ss++) |
666 |
if ((ss->lastseen == NULL || ss->lastseen < ancient) && |
if ((ss->lastseen == NULL || ss->lastseen < ancient) && |
667 |
!(ss->flags&LOCKED)) { |
!(ss->flags&LOCKED)) { |
668 |
d->search = ss + 1; |
d->search = ss + 1; |
669 |
FDEBUG(("replacing c%d\n", ss - d->ssets)); |
FDEBUG(("replacing c%d\n", ss - d->ssets)); |
670 |
return ss; |
return ss; |
671 |
} |
} |
672 |
|
|
673 |
/* nobody's old enough?!? -- something's really wrong */ |
/* nobody's old enough?!? -- something's really wrong */ |
674 |
FDEBUG(("can't find victim to replace!\n")); |
FDEBUG(("can't find victim to replace!\n")); |
675 |
assert(NOTREACHED); |
assert(NOTREACHED); |
676 |
ERR(REG_ASSERT); |
ERR(REG_ASSERT); |
677 |
return d->ssets; |
return d->ssets; |
678 |
} |
} |
679 |
|
|
680 |
/* End of rege_dfa.c */ |
/* End of rege_dfa.c */ |