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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38 static char sccsid[] = "@(#)closure.c 5.3 (Berkeley) 5/24/93";
47 static unsigned *first_derives;
53 register unsigned *row;
60 rowsize = WORDSIZE(nvars);
61 EFF = NEW2(nvars * rowsize, unsigned);
64 for (i = start_symbol; i < nsyms; i++)
67 for (rule = *sp; rule > 0; rule = *++sp)
69 symbol = ritem[rrhs[rule]];
72 symbol -= start_symbol;
79 reflexive_transitive_closure(EFF, nvars);
89 register unsigned *rrow;
90 register unsigned *vrow;
93 register unsigned cword;
101 rulesetsize = WORDSIZE(nrules);
102 varsetsize = WORDSIZE(nvars);
103 first_derives = NEW2(nvars * rulesetsize, unsigned) - ntokens * rulesetsize;
107 rrow = first_derives + ntokens * rulesetsize;
108 for (i = start_symbol; i < nsyms; i++)
110 vrow = EFF + ((i - ntokens) * varsetsize);
112 for (j = start_symbol; j < nsyms; k++, j++)
114 if (k >= BITS_PER_WORD)
120 if (cword & (1 << k))
123 while ((rule = *rp++) >= 0)
135 print_first_derives();
147 register unsigned word;
150 register unsigned *dsp;
151 register unsigned *rsp;
152 register int rulesetsize;
159 rulesetsize = WORDSIZE(nrules);
161 rsend = ruleset + rulesetsize;
162 for (rsp = ruleset; rsp < rsend; rsp++)
166 for (csp = nucleus; csp < csend; ++csp)
168 symbol = ritem[*csp];
171 dsp = first_derives + symbol * rulesetsize;
179 itemsetend = itemset;
181 for (rsp = ruleset; rsp < rsend; ++rsp)
186 for (i = 0; i < BITS_PER_WORD; ++i)
190 itemno = rrhs[ruleno+i];
191 while (csp < csend && *csp < itemno)
192 *itemsetend++ = *csp++;
193 *itemsetend++ = itemno;
194 while (csp < csend && *csp == itemno)
199 ruleno += BITS_PER_WORD;
203 *itemsetend++ = *csp++;
216 FREE(first_derives + ntokens * WORDSIZE(nrules));
227 printf("\n\nn = %d\n\n", n);
228 for (isp = itemset; isp < itemsetend; isp++)
229 printf(" %d\n", *isp);
236 register unsigned *rowp;
237 register unsigned word;
240 printf("\n\nEpsilon Free Firsts\n");
242 for (i = start_symbol; i < nsyms; i++)
244 printf("\n%s", symbol_name[i]);
245 rowp = EFF + ((i - start_symbol) * WORDSIZE(nvars));
249 for (j = 0; j < nvars; k++, j++)
251 if (k >= BITS_PER_WORD)
258 printf(" %s", symbol_name[start_symbol + j]);
264 print_first_derives()
268 register unsigned *rp;
269 register unsigned cword;
272 printf("\n\n\nFirst Derives\n");
274 for (i = start_symbol; i < nsyms; i++)
276 printf("\n%s derives\n", symbol_name[i]);
277 rp = first_derives + i * WORDSIZE(nrules);
279 for (j = 0; j <= nrules; k++, j++)
281 if (k >= BITS_PER_WORD)
287 if (cword & (1 << k))