2 * Copyright (c) 1989 The Regents of the University of California.
5 * This code is derived from software contributed to Berkeley by
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
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16 * 3. All advertising materials mentioning features or use of this software
17 * must display the following acknowledgement:
18 * This product includes software developed by the University of
19 * California, Berkeley and its contributors.
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
22 * without specific prior written permission.
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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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 1.2 2003/06/17 04:29:34 dillon Exp $
39 * @(#)closure.c 5.3 (Berkeley) 5/24/93
49 static void set_EFF __P((void));
51 static void print_closure __P((int));
52 static void print_EFF __P(());
53 static void print_first_derives __P(());
56 static unsigned *first_derives;
63 register unsigned *row;
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);
100 register unsigned *rrow;
101 register unsigned *vrow;
104 register unsigned cword = 0;
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();
159 register unsigned word;
162 register unsigned *dsp;
163 register unsigned *rsp;
164 register int rulesetsize;
171 rulesetsize = WORDSIZE(nrules);
173 rsend = ruleset + rulesetsize;
174 for (rsp = ruleset; rsp < rsend; rsp++)
178 for (csp = nucleus; csp < csend; ++csp)
180 symbol = ritem[*csp];
183 dsp = first_derives + symbol * rulesetsize;
191 itemsetend = itemset;
193 for (rsp = ruleset; rsp < rsend; ++rsp)
198 for (i = 0; i < BITS_PER_WORD; ++i)
202 itemno = rrhs[ruleno+i];
203 while (csp < csend && *csp < itemno)
204 *itemsetend++ = *csp++;
205 *itemsetend++ = itemno;
206 while (csp < csend && *csp == itemno)
211 ruleno += BITS_PER_WORD;
215 *itemsetend++ = *csp++;
229 FREE(first_derives + ntokens * WORDSIZE(nrules));
241 printf("\n\nn = %d\n\n", n);
242 for (isp = itemset; isp < itemsetend; isp++)
243 printf(" %d\n", *isp);
251 register unsigned *rowp;
252 register unsigned word;
255 printf("\n\nEpsilon Free Firsts\n");
257 for (i = start_symbol; i < nsyms; i++)
259 printf("\n%s", symbol_name[i]);
260 rowp = EFF + ((i - start_symbol) * WORDSIZE(nvars));
264 for (j = 0; j < nvars; k++, j++)
266 if (k >= BITS_PER_WORD)
273 printf(" %s", symbol_name[start_symbol + j]);
280 print_first_derives()
284 register unsigned *rp;
285 register unsigned cword;
288 printf("\n\n\nFirst Derives\n");
290 for (i = start_symbol; i < nsyms; i++)
292 printf("\n%s derives\n", symbol_name[i]);
293 rp = first_derives + i * WORDSIZE(nrules);
295 for (j = 0; j <= nrules; k++, j++)
297 if (k >= BITS_PER_WORD)
303 if (cword & (1 << k))