2 * Copyright (c) 1989 The Regents of the University of California.
5 * This code is derived from software contributed to Berkeley by
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18 * This product includes software developed by the University of
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20 * 4. Neither the name of the University nor the names of its contributors
21 * may be used to endorse or promote products derived from this software
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24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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36 * $FreeBSD: src/usr.bin/yacc/closure.c,v 1.6 1999/08/28 01:07:58 peter Exp $
37 * $DragonFly: src/usr.bin/yacc/closure.c,v 1.4 2004/04/07 20:43:24 cpressey Exp $
39 * @(#)closure.c 5.3 (Berkeley) 5/24/93
49 static void set_EFF(void);
51 static void print_closure(int);
52 static void print_EFF();
53 static void print_first_derives();
56 static unsigned *first_derives;
70 rowsize = WORDSIZE(nvars);
71 EFF = NEW2(nvars * rowsize, unsigned);
74 for (i = start_symbol; i < nsyms; i++)
77 for (rule = *sp; rule > 0; rule = *++sp)
79 symbol = ritem[rrhs[rule]];
82 symbol -= start_symbol;
89 reflexive_transitive_closure(EFF, nvars);
98 set_first_derives(void)
112 rulesetsize = WORDSIZE(nrules);
113 varsetsize = WORDSIZE(nvars);
114 first_derives = NEW2(nvars * rulesetsize, unsigned) - ntokens * rulesetsize;
118 rrow = first_derives + ntokens * rulesetsize;
119 for (i = start_symbol; i < nsyms; i++)
121 vrow = EFF + ((i - ntokens) * varsetsize);
123 for (j = start_symbol; j < nsyms; k++, j++)
125 if (k >= BITS_PER_WORD)
131 if (cword & (1 << k))
134 while ((rule = *rp++) >= 0)
146 print_first_derives();
154 closure(short *nucleus, int n)
169 rulesetsize = WORDSIZE(nrules);
171 rsend = ruleset + rulesetsize;
172 for (rsp = ruleset; rsp < rsend; rsp++)
176 for (csp = nucleus; csp < csend; ++csp)
178 symbol = ritem[*csp];
181 dsp = first_derives + symbol * rulesetsize;
189 itemsetend = itemset;
191 for (rsp = ruleset; rsp < rsend; ++rsp)
196 for (i = 0; i < BITS_PER_WORD; ++i)
200 itemno = rrhs[ruleno+i];
201 while (csp < csend && *csp < itemno)
202 *itemsetend++ = *csp++;
203 *itemsetend++ = itemno;
204 while (csp < csend && *csp == itemno)
209 ruleno += BITS_PER_WORD;
213 *itemsetend++ = *csp++;
223 finalize_closure(void)
227 FREE(first_derives + ntokens * WORDSIZE(nrules));
238 printf("\n\nn = %d\n\n", n);
239 for (isp = itemset; isp < itemsetend; isp++)
240 printf(" %d\n", *isp);
252 printf("\n\nEpsilon Free Firsts\n");
254 for (i = start_symbol; i < nsyms; i++)
256 printf("\n%s", symbol_name[i]);
257 rowp = EFF + ((i - start_symbol) * WORDSIZE(nvars));
261 for (j = 0; j < nvars; k++, j++)
263 if (k >= BITS_PER_WORD)
270 printf(" %s", symbol_name[start_symbol + j]);
277 print_first_derives(void)
285 printf("\n\n\nFirst Derives\n");
287 for (i = start_symbol; i < nsyms; i++)
289 printf("\n%s derives\n", symbol_name[i]);
290 rp = first_derives + i * WORDSIZE(nrules);
292 for (j = 0; j <= nrules; k++, j++)
294 if (k >= BITS_PER_WORD)
300 if (cword & (1 << k))