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-rw-r--r--tools/bison++/print.cc369
1 files changed, 369 insertions, 0 deletions
diff --git a/tools/bison++/print.cc b/tools/bison++/print.cc
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+++ b/tools/bison++/print.cc
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+/* Print information on generated parser, for bison,
+ Copyright (C) 1984, 1986, 1989 Free Software Foundation, Inc.
+
+This file is part of Bison, the GNU Compiler Compiler.
+
+Bison is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+Bison is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with Bison; see the file COPYING. If not, write to
+the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
+
+
+#include <stdio.h>
+#include "system.h"
+#include "machine.h"
+#include "new.h"
+#include "files.h"
+#include "gram.h"
+#include "state.h"
+
+
+extern char **tags;
+extern int nstates;
+extern short *accessing_symbol;
+extern core **state_table;
+extern shifts **shift_table;
+extern errs **err_table;
+extern reductions **reduction_table;
+extern char *consistent;
+extern char any_conflicts;
+extern char *conflicts;
+extern int final_state;
+
+extern void conflict_log();
+extern void verbose_conflict_log();
+extern void print_reductions(int);
+
+void print_token(int,int);
+void print_state(int);
+void print_core(int);
+void print_actions(int);
+void print_grammar();
+
+void
+terse()
+{
+ if (any_conflicts)
+ {
+ conflict_log();
+ }
+}
+
+
+void
+verbose()
+{
+ register int i;
+
+ if (any_conflicts)
+ verbose_conflict_log();
+
+ print_grammar();
+
+ for (i = 0; i < nstates; i++)
+ {
+ print_state(i);
+ }
+}
+
+
+void
+print_token(int extnum, int token)
+{
+ fprintf(foutput, " type %d is %s\n", extnum, tags[token]);
+}
+
+
+void
+print_state(int state)
+{
+ fprintf(foutput, "\n\nstate %d\n\n", state);
+ print_core(state);
+ print_actions(state);
+}
+
+
+void
+print_core(int state)
+{
+ register int i;
+ register int k;
+ register int rule;
+ register core *statep;
+ register short *sp;
+ register short *sp1;
+
+ statep = state_table[state];
+ k = statep->nitems;
+
+ if (k == 0) return;
+
+ for (i = 0; i < k; i++)
+ {
+ sp1 = sp = ritem + statep->items[i];
+
+ while (*sp > 0)
+ sp++;
+
+ rule = -(*sp);
+ fprintf(foutput, " %s -> ", tags[rlhs[rule]]);
+
+ for (sp = ritem + rrhs[rule]; sp < sp1; sp++)
+ {
+ fprintf(foutput, "%s ", tags[*sp]);
+ }
+
+ putc('.', foutput);
+
+ while (*sp > 0)
+ {
+ fprintf(foutput, " %s", tags[*sp]);
+ sp++;
+ }
+
+ fprintf (foutput, " (rule %d)", rule);
+ putc('\n', foutput);
+ }
+
+ putc('\n', foutput);
+}
+
+
+void
+print_actions(int state)
+{
+ register int i;
+ register int k;
+ register int state1;
+ register int symbol;
+ register shifts *shiftp;
+ register errs *errp;
+ register reductions *redp;
+ register int rule;
+
+ shiftp = shift_table[state];
+ redp = reduction_table[state];
+ errp = err_table[state];
+
+ if (!shiftp && !redp)
+ {
+ if (final_state == state)
+ fprintf(foutput, " $default\taccept\n");
+ else
+ fprintf(foutput, " NO ACTIONS\n");
+ return;
+ }
+
+ if (shiftp)
+ {
+ k = shiftp->nshifts;
+
+ for (i = 0; i < k; i++)
+ {
+ if (! shiftp->internalShifts[i]) continue;
+ state1 = shiftp->internalShifts[i];
+ symbol = accessing_symbol[state1];
+ /* The following line used to be turned off. */
+ if (ISVAR(symbol)) break;
+ if (symbol==0) /* I.e. strcmp(tags[symbol],"$")==0 */
+ fprintf(foutput, " $ \tgo to state %d\n", state1);
+ else
+ fprintf(foutput, " %-4s\tshift, and go to state %d\n",
+ tags[symbol], state1);
+ }
+
+ if (i > 0)
+ putc('\n', foutput);
+ }
+ else
+ {
+ i = 0;
+ k = 0;
+ }
+
+ if (errp)
+ {
+ int j, nerrs;
+
+ nerrs = errp->nerrs;
+
+ for (j = 0; j < nerrs; j++)
+ {
+ if (! errp->internalErrs[j]) continue;
+ symbol = errp->internalErrs[j];
+ fprintf(foutput, " %-4s\terror (nonassociative)\n", tags[symbol]);
+ }
+
+ if (j > 0)
+ putc('\n', foutput);
+ }
+
+ if (consistent[state] && redp)
+ {
+ rule = redp->rules[0];
+ symbol = rlhs[rule];
+ fprintf(foutput, " $default\treduce using rule %d (%s)\n\n",
+ rule, tags[symbol]);
+ }
+ else if (redp)
+ {
+ print_reductions(state);
+ }
+
+ if (i < k)
+ {
+ for (; i < k; i++)
+ {
+ if (! shiftp->internalShifts[i]) continue;
+ state1 = shiftp->internalShifts[i];
+ symbol = accessing_symbol[state1];
+ fprintf(foutput, " %-4s\tgo to state %d\n", tags[symbol], state1);
+ }
+
+ putc('\n', foutput);
+ }
+}
+
+#define END_TEST(end) \
+ if (column + strlen(buffer) > (end)) \
+ { fprintf (foutput, "%s\n ", buffer); column = 3; buffer[0] = 0; } \
+ else
+
+void
+print_grammar()
+{
+ int i, j;
+ short* rule;
+ char buffer[90];
+ int column = 0;
+
+ /* rule # : LHS -> RHS */
+ fputs("\nGrammar\n", foutput);
+ for (i = 1; i <= nrules; i++)
+ /* Don't print rules disabled in reduce_grammar_tables. */
+ if (rlhs[i] >= 0)
+ {
+ fprintf(foutput, "rule %-4d %s ->", i, tags[rlhs[i]]);
+ rule = &ritem[rrhs[i]];
+ if (*rule > 0)
+ while (*rule > 0)
+ fprintf(foutput, " %s", tags[*rule++]);
+ else
+ fputs (" /* empty */", foutput);
+ putc('\n', foutput);
+ }
+
+ /* TERMINAL (type #) : rule #s terminal is on RHS */
+ fputs("\nTerminals, with rules where they appear\n\n", foutput);
+ fprintf(foutput, "%s (-1)\n", tags[0]);
+ if (translations)
+ {
+ for (i = 0; i <= max_user_token_number; i++)
+ if (token_translations[i] != 2)
+ {
+ buffer[0] = 0;
+ column = strlen (tags[token_translations[i]]);
+ fprintf(foutput, "%s", tags[token_translations[i]]);
+ END_TEST (50);
+ sprintf (buffer, " (%d)", i);
+
+ for (j = 1; j <= nrules; j++)
+ {
+ for (rule = &ritem[rrhs[j]]; *rule > 0; rule++)
+ if (*rule == token_translations[i])
+ {
+ END_TEST (65);
+ sprintf (buffer + strlen(buffer), " %d", j);
+ break;
+ }
+ }
+ fprintf (foutput, "%s\n", buffer);
+ }
+ }
+ else
+ for (i = 1; i < ntokens; i++)
+ {
+ buffer[0] = 0;
+ column = strlen (tags[i]);
+ fprintf(foutput, "%s", tags[i]);
+ END_TEST (50);
+ sprintf (buffer, " (%d)", i);
+
+ for (j = 1; j <= nrules; j++)
+ {
+ for (rule = &ritem[rrhs[j]]; *rule > 0; rule++)
+ if (*rule == i)
+ {
+ END_TEST (65);
+ sprintf (buffer + strlen(buffer), " %d", j);
+ break;
+ }
+ }
+ fprintf (foutput, "%s\n", buffer);
+ }
+
+ fputs("\nNonterminals, with rules where they appear\n\n", foutput);
+ for (i = ntokens; i <= nsyms - 1; i++)
+ {
+ int left_count = 0, right_count = 0;
+
+ for (j = 1; j <= nrules; j++)
+ {
+ if (rlhs[j] == i)
+ left_count++;
+ for (rule = &ritem[rrhs[j]]; *rule > 0; rule++)
+ if (*rule == i)
+ {
+ right_count++;
+ break;
+ }
+ }
+
+ buffer[0] = 0;
+ fprintf(foutput, "%s", tags[i]);
+ column = strlen (tags[i]);
+ sprintf (buffer, " (%d)", i);
+ END_TEST (0);
+
+ if (left_count > 0)
+ {
+ END_TEST (50);
+ sprintf (buffer + strlen(buffer), " on left:");
+
+ for (j = 1; j <= nrules; j++)
+ {
+ END_TEST (65);
+ if (rlhs[j] == i)
+ sprintf (buffer + strlen(buffer), " %d", j);
+ }
+ }
+
+ if (right_count > 0)
+ {
+ if (left_count > 0)
+ sprintf (buffer + strlen(buffer), ",");
+ END_TEST (50);
+ sprintf (buffer + strlen(buffer), " on right:");
+ for (j = 1; j <= nrules; j++)
+ {
+ for (rule = &ritem[rrhs[j]]; *rule > 0; rule++)
+ if (*rule == i)
+ {
+ END_TEST (65);
+ sprintf (buffer + strlen(buffer), " %d", j);
+ break;
+ }
+ }
+ }
+ fprintf (foutput, "%s\n", buffer);
+ }
+}
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