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- #include "defs.h"
- short *itemset;
- short *itemsetend;
- unsigned *ruleset;
- static unsigned *first_derives;
- static unsigned *EFF;
- set_EFF()
- {
- register unsigned *row;
- register int symbol;
- register short *sp;
- register int rowsize;
- register int i;
- register int rule;
- rowsize = WORDSIZE(nvars);
- EFF = NEW2(nvars * rowsize, unsigned);
- row = EFF;
- for (i = start_symbol; i < nsyms; i++)
- {
- sp = derives[i];
- for (rule = *sp; rule > 0; rule = *++sp)
- {
- symbol = ritem[rrhs[rule]];
- if (ISVAR(symbol))
- {
- symbol -= start_symbol;
- SETBIT(row, symbol);
- }
- }
- row += rowsize;
- }
- reflexive_transitive_closure(EFF, nvars);
- #ifdef DEBUG
- print_EFF();
- #endif
- }
- set_first_derives()
- {
- register unsigned *rrow;
- register unsigned *vrow;
- register int j;
- register unsigned mask;
- register unsigned cword;
- register short *rp;
- int rule;
- int i;
- int rulesetsize;
- int varsetsize;
- rulesetsize = WORDSIZE(nrules);
- varsetsize = WORDSIZE(nvars);
- first_derives = NEW2(nvars * rulesetsize, unsigned) - ntokens * rulesetsize;
- set_EFF();
- rrow = first_derives + ntokens * rulesetsize;
- for (i = start_symbol; i < nsyms; i++)
- {
- vrow = EFF + ((i - ntokens) * varsetsize);
- cword = *vrow++;
- mask = 1;
- for (j = start_symbol; j < nsyms; j++)
- {
- if (cword & mask)
- {
- rp = derives[j];
- while ((rule = *rp++) >= 0)
- {
- SETBIT(rrow, rule);
- }
- }
- mask <<= 1;
- if (mask == 0)
- {
- cword = *vrow++;
- mask = 1;
- }
- }
- vrow += varsetsize;
- rrow += rulesetsize;
- }
- #ifdef DEBUG
- print_first_derives();
- #endif
- FREE(EFF);
- }
- closure(nucleus, n)
- short *nucleus;
- int n;
- {
- register int ruleno;
- register unsigned word;
- register unsigned mask;
- register short *csp;
- register unsigned *dsp;
- register unsigned *rsp;
- register int rulesetsize;
- short *csend;
- unsigned *rsend;
- int symbol;
- int itemno;
- rulesetsize = WORDSIZE(nrules);
- rsp = ruleset;
- rsend = ruleset + rulesetsize;
- for (rsp = ruleset; rsp < rsend; rsp++)
- *rsp = 0;
- csend = nucleus + n;
- for (csp = nucleus; csp < csend; ++csp)
- {
- symbol = ritem[*csp];
- if (ISVAR(symbol))
- {
- dsp = first_derives + symbol * rulesetsize;
- rsp = ruleset;
- while (rsp < rsend)
- *rsp++ |= *dsp++;
- }
- }
- ruleno = 0;
- itemsetend = itemset;
- csp = nucleus;
- for (rsp = ruleset; rsp < rsend; ++rsp)
- {
- word = *rsp;
- if (word == 0)
- ruleno += BITS_PER_WORD;
- else
- {
- mask = 1;
- while (mask)
- {
- if (word & mask)
- {
- itemno = rrhs[ruleno];
- while (csp < csend && *csp < itemno)
- *itemsetend++ = *csp++;
- *itemsetend++ = itemno;
- while (csp < csend && *csp == itemno)
- ++csp;
- }
- mask <<= 1;
- ++ruleno;
- }
- }
- }
- while (csp < csend)
- *itemsetend++ = *csp++;
- #ifdef DEBUG
- print_closure(n);
- #endif
- }
- finalize_closure()
- {
- FREE(itemset);
- FREE(ruleset);
- FREE(first_derives + ntokens * WORDSIZE(nrules));
- }
- #ifdef DEBUG
- print_closure(n)
- int n;
- {
- register short *isp;
- printf("\n\nn = %d\n\n", n);
- for (isp = itemset; isp < itemsetend; isp++)
- printf(" %d\n", *isp);
- }
- print_EFF()
- {
- register int i, j, k;
- register unsigned *rowp;
- register unsigned word;
- register unsigned mask;
- printf("\n\nEpsilon Free Firsts\n");
- for (i = start_symbol; i < nsyms; i++)
- {
- printf("\n%s", symbol_name[i]);
- rowp = EFF + ((i - start_symbol) * WORDSIZE(nvars));
- word = *rowp++;
- mask = 1;
- for (j = 0; j < nvars; j++)
- {
- if (word & mask)
- printf(" %s", symbol_name[start_symbol + j]);
- mask <<= 1;
- if (mask == 0)
- {
- word = *rowp++;
- mask = 1;
- }
- }
- }
- }
- print_first_derives()
- {
- register int i;
- register int j;
- register unsigned *rp;
- register unsigned cword;
- register unsigned mask;
- printf("\n\n\nFirst Derives\n");
- for (i = start_symbol; i < nsyms; i++)
- {
- printf("\n%s derives\n", symbol_name[i]);
- rp = first_derives + i * WORDSIZE(nrules);
- cword = *rp++;
- mask = 1;
- for (j = 0; j <= nrules; j++)
- {
- if (cword & mask)
- printf(" %d\n", j);
- mask <<= 1;
- if (mask == 0)
- {
- cword = *rp++;
- mask = 1;
- }
- }
- }
- fflush(stdout);
- }
- #endif
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