386 lines
8.4 KiB
C
386 lines
8.4 KiB
C
/*
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* Copyright (c) 1989 The Regents of the University of California.
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* All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Robert Paul Corbett.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#if 0
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#ifndef lint
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static char sccsid[] = "@(#)verbose.c 5.3 (Berkeley) 1/20/91";
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#endif
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#endif
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <stdlib.h>
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#include "defs.h"
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static short *null_rules;
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static void log_unused(void);
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static void log_conflicts(void);
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static void print_actions(int);
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static void print_conflicts(int);
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static void print_core(int);
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static void print_gotos(int);
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static void print_nulls(int);
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static void print_reductions(action *, register int);
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static void print_shifts(action *);
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static void print_state(int);
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void
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verbose(void)
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{
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int i;
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if (!vflag) return;
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null_rules = malloc(nrules*sizeof(short));
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if (null_rules == 0) no_space();
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fprintf(verbose_file, "\f\n");
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for (i = 0; i < nstates; i++)
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print_state(i);
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free(null_rules);
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if (nunused)
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log_unused();
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if (SRtotal || RRtotal)
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log_conflicts();
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fprintf(verbose_file, "\n\n%d terminals, %d nonterminals\n", ntokens,
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nvars);
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fprintf(verbose_file, "%d grammar rules, %d states\n", nrules - 2, nstates);
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}
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static void
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log_unused(void)
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{
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int i;
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short *p;
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fprintf(verbose_file, "\n\nRules never reduced:\n");
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for (i = 3; i < nrules; ++i)
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{
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if (!rules_used[i])
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{
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fprintf(verbose_file, "\t%s :", symbol_name[rlhs[i]]);
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for (p = ritem + rrhs[i]; *p >= 0; ++p)
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fprintf(verbose_file, " %s", symbol_name[*p]);
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fprintf(verbose_file, " (%d)\n", i - 2);
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}
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}
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}
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static void
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log_conflicts(void)
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{
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int i;
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fprintf(verbose_file, "\n\n");
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for (i = 0; i < nstates; i++)
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{
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if (SRconflicts[i] || RRconflicts[i])
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{
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fprintf(verbose_file, "State %d contains ", i);
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if (SRconflicts[i] == 1)
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fprintf(verbose_file, "1 shift/reduce conflict");
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else if (SRconflicts[i] > 1)
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fprintf(verbose_file, "%d shift/reduce conflicts",
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SRconflicts[i]);
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if (SRconflicts[i] && RRconflicts[i])
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fprintf(verbose_file, ", ");
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if (RRconflicts[i] == 1)
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fprintf(verbose_file, "1 reduce/reduce conflict");
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else if (RRconflicts[i] > 1)
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fprintf(verbose_file, "%d reduce/reduce conflicts",
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RRconflicts[i]);
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fprintf(verbose_file, ".\n");
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}
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}
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}
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static void
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print_state(int state)
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{
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if (state)
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fprintf(verbose_file, "\n\n");
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if (SRconflicts[state] || RRconflicts[state])
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print_conflicts(state);
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fprintf(verbose_file, "state %d\n", state);
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print_core(state);
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print_nulls(state);
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print_actions(state);
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}
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static void
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print_conflicts(int state)
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{
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int symbol, act = 0, number = 0;
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action *p;
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symbol = -1;
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for (p = parser[state]; p; p = p->next)
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{
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if (p->suppressed == 2)
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continue;
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if (p->symbol != symbol)
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{
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symbol = p->symbol;
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number = p->number;
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if (p->action_code == SHIFT)
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act = SHIFT;
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else
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act = REDUCE;
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}
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else if (p->suppressed == 1)
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{
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if (state == final_state && symbol == 0)
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{
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fprintf(verbose_file, "%d: shift/reduce conflict \
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(accept, reduce %d) on $end\n", state, p->number - 2);
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}
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else
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{
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if (act == SHIFT)
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{
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fprintf(verbose_file, "%d: shift/reduce conflict \
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(shift %d, reduce %d) on %s\n", state, number, p->number - 2,
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symbol_name[symbol]);
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}
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else
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{
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fprintf(verbose_file, "%d: reduce/reduce conflict \
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(reduce %d, reduce %d) on %s\n", state, number - 2, p->number - 2,
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symbol_name[symbol]);
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}
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}
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}
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}
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}
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static void
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print_core(int state)
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{
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int i;
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int k;
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int rule;
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core *statep;
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short *sp;
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short *sp1;
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statep = state_table[state];
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k = statep->nitems;
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for (i = 0; i < k; i++)
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{
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sp1 = sp = ritem + statep->items[i];
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while (*sp >= 0) ++sp;
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rule = -(*sp);
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fprintf(verbose_file, "\t%s : ", symbol_name[rlhs[rule]]);
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for (sp = ritem + rrhs[rule]; sp < sp1; sp++)
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fprintf(verbose_file, "%s ", symbol_name[*sp]);
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putc('.', verbose_file);
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while (*sp >= 0)
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{
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fprintf(verbose_file, " %s", symbol_name[*sp]);
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sp++;
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}
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fprintf(verbose_file, " (%d)\n", -2 - *sp);
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}
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}
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static void
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print_nulls(int state)
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{
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action *p;
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int i, j, k, nnulls;
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nnulls = 0;
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for (p = parser[state]; p; p = p->next)
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{
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if (p->action_code == REDUCE &&
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(p->suppressed == 0 || p->suppressed == 1))
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{
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i = p->number;
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if (rrhs[i] + 1 == rrhs[i+1])
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{
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for (j = 0; j < nnulls && i > null_rules[j]; ++j)
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continue;
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if (j == nnulls)
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{
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++nnulls;
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null_rules[j] = i;
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}
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else if (i != null_rules[j])
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{
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++nnulls;
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for (k = nnulls - 1; k > j; --k)
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null_rules[k] = null_rules[k-1];
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null_rules[j] = i;
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}
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}
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}
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}
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for (i = 0; i < nnulls; ++i)
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{
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j = null_rules[i];
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fprintf(verbose_file, "\t%s : . (%d)\n", symbol_name[rlhs[j]],
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j - 2);
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}
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fprintf(verbose_file, "\n");
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}
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static void
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print_actions(int stateno)
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{
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action *p;
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shifts *sp;
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int as;
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if (stateno == final_state)
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fprintf(verbose_file, "\t$end accept\n");
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p = parser[stateno];
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if (p)
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{
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print_shifts(p);
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print_reductions(p, defred[stateno]);
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}
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sp = shift_table[stateno];
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if (sp && sp->nshifts > 0)
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{
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as = accessing_symbol[sp->shift[sp->nshifts - 1]];
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if (ISVAR(as))
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print_gotos(stateno);
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}
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}
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static void
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print_shifts(action *p)
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{
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int count;
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action *q;
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count = 0;
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for (q = p; q; q = q->next)
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{
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if (q->suppressed < 2 && q->action_code == SHIFT)
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++count;
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}
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if (count > 0)
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{
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for (; p; p = p->next)
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{
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if (p->action_code == SHIFT && p->suppressed == 0)
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fprintf(verbose_file, "\t%s shift %d\n",
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symbol_name[p->symbol], p->number);
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}
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}
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}
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static void
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print_reductions(action *p, int defreduct)
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{
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int k, anyreds;
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action *q;
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anyreds = 0;
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for (q = p; q ; q = q->next)
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{
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if (q->action_code == REDUCE && q->suppressed < 2)
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{
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anyreds = 1;
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break;
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}
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}
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if (anyreds == 0)
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fprintf(verbose_file, "\t. error\n");
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else
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{
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for (; p; p = p->next)
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{
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if (p->action_code == REDUCE && p->number != defreduct)
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{
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k = p->number - 2;
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if (p->suppressed == 0)
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fprintf(verbose_file, "\t%s reduce %d\n",
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symbol_name[p->symbol], k);
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}
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}
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if (defreduct > 0)
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fprintf(verbose_file, "\t. reduce %d\n", defreduct - 2);
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}
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}
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static void
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print_gotos(int stateno)
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{
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int i, k;
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int as;
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short *tostate;
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shifts *sp;
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putc('\n', verbose_file);
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sp = shift_table[stateno];
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tostate = sp->shift;
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for (i = 0; i < sp->nshifts; ++i)
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{
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k = tostate[i];
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as = accessing_symbol[k];
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if (ISVAR(as))
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fprintf(verbose_file, "\t%s goto %d\n", symbol_name[as], k);
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}
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}
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