8e022d3cde
Note that this enables the backtracking extension, which we had previously left disabled. PR: 244149, 269425 Sponsored by: Klara, Inc. Differential Revision: https://reviews.freebsd.org/D38421
113 lines
1.9 KiB
C
113 lines
1.9 KiB
C
/* $Id: graph.c,v 1.9 2020/09/10 17:22:51 tom Exp $ */
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#include "defs.h"
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static void graph_state(int stateno);
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static void graph_LA(int ruleno);
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static unsigned int larno;
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void
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graph(void)
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{
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int i;
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int j;
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shifts *sp;
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int sn;
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int as;
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if (!gflag)
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return;
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for (i = 0; i < nstates; ++i)
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{
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closure(state_table[i]->items, state_table[i]->nitems);
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graph_state(i);
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}
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fprintf(graph_file, "\n\n");
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for (i = 0; i < nstates; ++i)
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{
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sp = shift_table[i];
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if (sp)
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for (j = 0; j < sp->nshifts; ++j)
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{
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sn = sp->shift[j];
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as = accessing_symbol[sn];
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fprintf(graph_file,
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"\tq%d -> q%d [label=\"%s\"];\n",
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i, sn, symbol_pname[as]);
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}
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}
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fprintf(graph_file, "}\n");
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for (i = 0; i < nsyms; ++i)
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FREE(symbol_pname[i]);
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FREE(symbol_pname);
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}
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static void
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graph_state(int stateno)
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{
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Value_t *isp;
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Value_t *sp;
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larno = (unsigned)lookaheads[stateno];
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fprintf(graph_file, "\n\tq%d [label=\"%d:\\l", stateno, stateno);
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for (isp = itemset; isp < itemsetend; isp++)
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{
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Value_t *sp1;
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int rule;
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sp1 = sp = ritem + *isp;
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while (*sp >= 0)
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++sp;
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rule = -(*sp);
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fprintf(graph_file, " %s -> ", symbol_pname[rlhs[rule]]);
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for (sp = ritem + rrhs[rule]; sp < sp1; sp++)
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fprintf(graph_file, "%s ", symbol_pname[*sp]);
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putc('.', graph_file);
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while (*sp >= 0)
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{
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fprintf(graph_file, " %s", symbol_pname[*sp]);
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sp++;
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}
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if (*sp1 < 0)
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graph_LA(-*sp1);
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fprintf(graph_file, "\\l");
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}
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fprintf(graph_file, "\"];");
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}
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static void
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graph_LA(int ruleno)
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{
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unsigned tokensetsize;
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tokensetsize = (unsigned)WORDSIZE(ntokens);
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if (ruleno == LAruleno[larno])
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{
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int i;
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unsigned *rowp = LA + larno * tokensetsize;
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fprintf(graph_file, " { ");
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for (i = ntokens - 1; i >= 0; i--)
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{
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if (BIT(rowp, i))
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fprintf(graph_file, "%s ", symbol_pname[i]);
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}
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fprintf(graph_file, "}");
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++larno;
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}
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}
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