mirror of
https://git.savannah.gnu.org/git/bison.git
synced 2026-03-09 04:13:03 +00:00
007a50a493
errtoken->number. * src/reader.c (reader): Don't specify the user token number (2) for $undefined, as it uselessly prevents using it. * src/gram.h (token_number_t): Move to... * src/symtab.h: here. (state_t.number): Is a token_number_t. * src/print.c, src/reader.c: Use undeftoken->number instead of hard coded 2. (Even though this 2 is not the same as above: the number of the undeftoken remains being 2, it is its user token number which might not be 2). * src/output.c (prepare_tokens): Rename the `maxtok' muscle with `user_token_number_max'. Output `undef_token_number'. * data/bison.simple, data/bison.c++: Use them. Be sure to map invalid yylex return values to `undef_token_number'. This saves us from gratuitous SEGV. * tests/conflicts.at (Solved SR Conflicts) (Unresolved SR Conflicts): Adjust. * tests/regression.at (Web2c Actions): Adjust.
506 lines
12 KiB
C
506 lines
12 KiB
C
/* Print information on generated parser, for bison,
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Copyright (C) 1984, 1986, 1989, 2000, 2001, 2002
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Free Software Foundation, Inc.
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This file is part of Bison, the GNU Compiler Compiler.
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Bison is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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Bison is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with Bison; see the file COPYING. If not, write to
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the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include "system.h"
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#include "quotearg.h"
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#include "files.h"
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#include "symtab.h"
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#include "gram.h"
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#include "LR0.h"
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#include "lalr.h"
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#include "conflicts.h"
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#include "getargs.h"
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#include "state.h"
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#include "reader.h"
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#include "print.h"
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#include "reduce.h"
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#include "closure.h"
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#include "bitset.h"
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static bitset shiftset;
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static bitset lookaheadset;
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#if 0
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static void
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print_token (int extnum, int token)
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{
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fprintf (out, _(" type %d is %s\n"), extnum, tags[token]);
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}
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#endif
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static inline const char *
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escape (const char *s)
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{
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return quotearg_n_style (1, escape_quoting_style, s);
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}
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/* Be cautious not to use twice the same slot in a single expression. */
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static inline const char *
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escape2 (const char *s)
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{
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return quotearg_n_style (2, escape_quoting_style, s);
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}
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/*--------------------------------.
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| Report information on a state. |
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`--------------------------------*/
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static void
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print_core (FILE *out, state_t *state)
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{
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int i;
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item_number_t *sitems = state->items;
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int snritems = state->nitems;
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/* New experimental feature: if TRACE_FLAGS output all the items of
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a state, not only its kernel. */
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if (trace_flag)
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{
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closure (sitems, snritems);
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sitems = itemset;
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snritems = nritemset;
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}
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if (snritems)
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{
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for (i = 0; i < snritems; i++)
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{
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item_number_t *sp;
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item_number_t *sp1;
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int rule;
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sp1 = sp = ritem + sitems[i];
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while (*sp >= 0)
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sp++;
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rule = -(*sp);
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fprintf (out, " %s -> ", escape (rules[rule].lhs->tag));
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for (sp = rules[rule].rhs; sp < sp1; sp++)
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fprintf (out, "%s ", escape (symbols[*sp]->tag));
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fputc ('.', out);
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for (/* Nothing */; *sp >= 0; ++sp)
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fprintf (out, " %s", escape (symbols[*sp]->tag));
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fprintf (out, _(" (rule %d)"), rule - 1);
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fputc ('\n', out);
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}
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fputc ('\n', out);
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}
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}
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static void
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print_shifts (FILE *out, state_t *state)
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{
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int i;
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shifts *shiftp = state->shifts;
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for (i = 0; i < shiftp->nshifts && SHIFT_IS_SHIFT (shiftp, i); i++)
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if (!SHIFT_IS_DISABLED (shiftp, i))
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{
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int state1 = shiftp->shifts[i];
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int symbol = states[state1]->accessing_symbol;
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fprintf (out,
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_(" %-4s\tshift, and go to state %d\n"),
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escape (symbols[symbol]->tag), state1);
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}
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if (i > 0)
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fputc ('\n', out);
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}
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static void
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print_errs (FILE *out, state_t *state)
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{
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errs *errp = state->errs;
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int i;
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for (i = 0; i < errp->nerrs; ++i)
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if (errp->errs[i])
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fprintf (out, _(" %-4s\terror (nonassociative)\n"),
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escape (symbols[errp->errs[i]]->tag));
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if (i > 0)
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fputc ('\n', out);
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}
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static void
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print_gotos (FILE *out, state_t *state)
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{
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int i;
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shifts *shiftp = state->shifts;
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for (i = 0; i < shiftp->nshifts && SHIFT_IS_SHIFT (shiftp, i); i++)
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/* Skip token shifts. */;
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if (i < shiftp->nshifts)
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{
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for (; i < shiftp->nshifts; i++)
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if (!SHIFT_IS_DISABLED (shiftp, i))
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{
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int state1 = shiftp->shifts[i];
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int symbol = states[state1]->accessing_symbol;
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fprintf (out, _(" %-4s\tgo to state %d\n"),
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escape (symbols[symbol]->tag), state1);
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}
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fputc ('\n', out);
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}
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}
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static void
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print_reductions (FILE *out, state_t *state)
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{
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int i;
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shifts *shiftp = state->shifts;
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reductions *redp = state->reductions;
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errs *errp = state->errs;
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int nodefault = 0;
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if (redp->nreds == 0)
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return;
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if (state->consistent)
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{
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int rule = redp->rules[0];
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int symbol = rules[rule].lhs->number;
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fprintf (out, _(" $default\treduce using rule %d (%s)\n\n"),
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rule - 1, escape (symbols[symbol]->tag));
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return;
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}
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bitset_zero (shiftset);
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for (i = 0; i < shiftp->nshifts && SHIFT_IS_SHIFT (shiftp, i); i++)
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if (!SHIFT_IS_DISABLED (shiftp, i))
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{
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/* if this state has a shift for the error token, don't use a
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default rule. */
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if (SHIFT_IS_ERROR (shiftp, i))
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nodefault = 1;
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bitset_set (shiftset, SHIFT_SYMBOL (shiftp, i));
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}
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for (i = 0; i < errp->nerrs; i++)
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if (errp->errs[i])
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bitset_set (shiftset, errp->errs[i]);
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if (state->nlookaheads == 1 && !nodefault)
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{
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rule_t *default_rule = LArule[state->lookaheadsp];
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bitset_and (lookaheadset, LA[state->lookaheadsp], shiftset);
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for (i = 0; i < ntokens; i++)
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if (bitset_test (lookaheadset, i))
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fprintf (out, _(" %-4s\t[reduce using rule %d (%s)]\n"),
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escape (symbols[i]->tag),
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default_rule->number - 1,
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escape2 (default_rule->lhs->tag));
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fprintf (out, _(" $default\treduce using rule %d (%s)\n\n"),
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default_rule->number - 1,
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escape (default_rule->lhs->tag));
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}
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else if (state->nlookaheads >= 1)
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{
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int cmax = 0;
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int default_LA = -1;
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rule_t *default_rule = NULL;
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if (!nodefault)
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for (i = 0; i < state->nlookaheads; ++i)
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{
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int count = 0;
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int j;
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bitset_andn (lookaheadset, LA[state->lookaheadsp + i], shiftset);
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for (j = 0; j < ntokens; j++)
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if (bitset_test (lookaheadset, j))
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count++;
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if (count > cmax)
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{
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cmax = count;
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default_LA = state->lookaheadsp + i;
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default_rule = LArule[state->lookaheadsp + i];
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}
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bitset_or (shiftset, shiftset, lookaheadset);
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}
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bitset_zero (shiftset);
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for (i = 0; i < shiftp->nshifts && SHIFT_IS_SHIFT (shiftp, i); i++)
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if (!SHIFT_IS_DISABLED (shiftp, i))
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bitset_set (shiftset, SHIFT_SYMBOL (shiftp, i));
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for (i = 0; i < ntokens; i++)
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{
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int j;
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int defaulted = 0;
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int count = bitset_test (shiftset, i);
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for (j = 0; j < state->nlookaheads; ++j)
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if (bitset_test (LA[state->lookaheadsp + j], i))
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{
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if (count == 0)
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{
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if (state->lookaheadsp + j != default_LA)
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fprintf (out,
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_(" %-4s\treduce using rule %d (%s)\n"),
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escape (symbols[i]->tag),
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LArule[state->lookaheadsp + j]->number - 1,
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escape2 (LArule[state->lookaheadsp + j]->lhs->tag));
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else
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defaulted = 1;
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count++;
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}
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else
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{
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if (defaulted)
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fprintf (out,
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_(" %-4s\treduce using rule %d (%s)\n"),
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escape (symbols[i]->tag),
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LArule[default_LA]->number - 1,
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escape2 (LArule[default_LA]->lhs->tag));
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defaulted = 0;
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fprintf (out,
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_(" %-4s\t[reduce using rule %d (%s)]\n"),
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escape (symbols[i]->tag),
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LArule[state->lookaheadsp + j]->number - 1,
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escape2 (LArule[state->lookaheadsp + j]->lhs->tag));
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}
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}
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}
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if (default_LA >= 0)
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fprintf (out, _(" $default\treduce using rule %d (%s)\n"),
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default_rule->number - 1,
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escape (default_rule->lhs->tag));
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}
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}
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static void
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print_actions (FILE *out, state_t *state)
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{
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reductions *redp = state->reductions;
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shifts *shiftp = state->shifts;
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if (shiftp->nshifts == 0 && redp->nreds == 0)
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{
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if (final_state == state->number)
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fprintf (out, _(" $default\taccept\n"));
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else
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fprintf (out, _(" NO ACTIONS\n"));
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return;
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}
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print_shifts (out, state);
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print_errs (out, state);
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print_reductions (out, state);
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print_gotos (out, state);
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}
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static void
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print_state (FILE *out, state_t *state)
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{
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fprintf (out, _("state %d"), state->number);
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fputs ("\n\n", out);
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print_core (out, state);
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print_actions (out, state);
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fputs ("\n\n", out);
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}
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/*-----------------------------------------.
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| Print information on the whole grammar. |
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`-----------------------------------------*/
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#define END_TEST(End) \
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do { \
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if (column + strlen(buffer) > (End)) \
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{ \
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fprintf (out, "%s\n ", buffer); \
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column = 3; \
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buffer[0] = 0; \
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} \
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} while (0)
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static void
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print_grammar (FILE *out)
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{
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int i, j;
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item_number_t *rule;
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char buffer[90];
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int column = 0;
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/* rule # : LHS -> RHS */
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fprintf (out, "%s\n\n", _("Grammar"));
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fprintf (out, " %s\n", _("Number, Line, Rule"));
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for (i = 1; i < nrules + 1; i++)
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{
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fprintf (out, _(" %3d %3d %s ->"),
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i - 1, rules[i].line, escape (rules[i].lhs->tag));
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rule = rules[i].rhs;
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if (*rule >= 0)
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while (*rule >= 0)
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fprintf (out, " %s", escape (symbols[*rule++]->tag));
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else
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fprintf (out, " /* %s */", _("empty"));
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fputc ('\n', out);
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}
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fputs ("\n\n", out);
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/* TERMINAL (type #) : rule #s terminal is on RHS */
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fprintf (out, "%s\n\n", _("Terminals, with rules where they appear"));
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for (i = 0; i < max_user_token_number + 1; i++)
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if (token_translations[i] != undeftoken->number)
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{
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buffer[0] = 0;
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column = strlen (escape (symbols[token_translations[i]]->tag));
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fputs (escape (symbols[token_translations[i]]->tag), out);
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END_TEST (50);
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sprintf (buffer, " (%d)", i);
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for (j = 1; j < nrules + 1; j++)
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for (rule = rules[j].rhs; *rule >= 0; rule++)
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if (*rule == token_translations[i])
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{
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END_TEST (65);
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sprintf (buffer + strlen (buffer), " %d", j - 1);
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break;
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}
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fprintf (out, "%s\n", buffer);
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}
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fputs ("\n\n", out);
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fprintf (out, "%s\n\n", _("Nonterminals, with rules where they appear"));
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for (i = ntokens; i < nsyms; i++)
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{
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int left_count = 0, right_count = 0;
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for (j = 1; j < nrules + 1; j++)
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{
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if (rules[j].lhs->number == i)
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left_count++;
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for (rule = rules[j].rhs; *rule >= 0; rule++)
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if (*rule == i)
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{
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right_count++;
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break;
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}
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}
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buffer[0] = 0;
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fputs (escape (symbols[i]->tag), out);
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column = strlen (escape (symbols[i]->tag));
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sprintf (buffer, " (%d)", i);
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END_TEST (0);
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if (left_count > 0)
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{
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END_TEST (50);
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sprintf (buffer + strlen (buffer), _(" on left:"));
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for (j = 1; j < nrules + 1; j++)
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{
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END_TEST (65);
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if (rules[j].lhs->number == i)
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sprintf (buffer + strlen (buffer), " %d", j - 1);
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}
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}
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if (right_count > 0)
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{
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if (left_count > 0)
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sprintf (buffer + strlen (buffer), ",");
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END_TEST (50);
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sprintf (buffer + strlen (buffer), _(" on right:"));
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for (j = 1; j < nrules + 1; j++)
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{
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for (rule = rules[j].rhs; *rule >= 0; rule++)
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if (*rule == i)
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{
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END_TEST (65);
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sprintf (buffer + strlen (buffer), " %d", j - 1);
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break;
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}
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}
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}
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fprintf (out, "%s\n", buffer);
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}
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fputs ("\n\n", out);
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}
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void
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print_results (void)
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{
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size_t i;
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/* We used to use just .out if SPEC_NAME_PREFIX (-p) was used, but
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that conflicts with Posix. */
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FILE *out = xfopen (spec_verbose_file, "w");
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size_t size = obstack_object_size (&output_obstack);
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fwrite (obstack_finish (&output_obstack), 1, size, out);
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obstack_free (&output_obstack, NULL);
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if (size)
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fputs ("\n\n", out);
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reduce_output (out);
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conflicts_output (out);
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print_grammar (out);
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/* New experimental feature: output all the items of a state, not
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only its kernel. Requires to run closure, which need memory
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allocation/deallocation. */
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if (trace_flag)
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new_closure (nritems);
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/* Storage for print_reductions. */
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shiftset = bitset_create (ntokens, BITSET_FIXED);
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lookaheadset = bitset_create (ntokens, BITSET_FIXED);
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for (i = 0; i < nstates; i++)
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print_state (out, states[i]);
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bitset_free (shiftset);
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bitset_free (lookaheadset);
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if (trace_flag)
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free_closure ();
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xfclose (out);
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}
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