X-Git-Url: https://git.saurik.com/bison.git/blobdiff_plain/ccaf65bc6331dfb0684876a7475c6474b99125ea..a26424642b1de2c5e237cd69a54f12b2f430321f:/src/print.c?ds=sidebyside diff --git a/src/print.c b/src/print.c index c531b04c..cb227aa5 100644 --- a/src/print.c +++ b/src/print.c @@ -1,43 +1,44 @@ /* Print information on generated parser, for bison, - Copyright (C) 1984, 1986, 1989, 2000, 2001, 2002 - Free Software Foundation, Inc. + + Copyright (C) 1984, 1986, 1989, 2000-2005, 2007, 2009-2012 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 + This program 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. + the Free Software Foundation, either version 3 of the License, or + (at your option) any later version. - Bison is distributed in the hope that it will be useful, + This program 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, Inc., 59 Temple Place - Suite 330, - Boston, MA 02111-1307, USA. */ - + along with this program. If not, see . */ +#include #include "system.h" -#include "quotearg.h" -#include "files.h" -#include "symtab.h" -#include "gram.h" + +#include + #include "LR0.h" -#include "lalr.h" +#include "closure.h" #include "conflicts.h" +#include "files.h" #include "getargs.h" -#include "state.h" -#include "reader.h" +#include "gram.h" +#include "lalr.h" +#include "muscle-tab.h" #include "print.h" +#include "reader.h" #include "reduce.h" -#include "closure.h" -#include "bitset.h" +#include "state.h" +#include "symtab.h" +#include "tables.h" -static bitset shiftset; -static bitset lookaheadset; +static bitset no_reduce_set; #if 0 static void @@ -66,19 +67,19 @@ max_length (size_t *width, const char *str) `--------------------------------*/ static void -print_core (FILE *out, state_t *state) +print_core (FILE *out, state *s) { - int i; - item_number_t *sitems = state->items; - int snritems = state->nitems; - symbol_t *previous_lhs = NULL; + size_t i; + item_number *sitems = s->items; + size_t snritems = s->nitems; + symbol *previous_lhs = NULL; /* Output all the items of a state, not only its kernel. */ if (report_flag & report_itemsets) { closure (sitems, snritems); sitems = itemset; - snritems = nritemset; + snritems = nitemset; } if (!snritems) @@ -88,54 +89,55 @@ print_core (FILE *out, state_t *state) for (i = 0; i < snritems; i++) { - item_number_t *sp; - item_number_t *sp1; - int rule; + item_number *sp; + item_number *sp1; + rule_number r; sp1 = sp = ritem + sitems[i]; while (*sp >= 0) sp++; - rule = -(*sp); + r = item_number_as_rule_number (*sp); - rule_lhs_print (&rules[rule], previous_lhs, out); - previous_lhs = rules[rule].lhs; + rule_lhs_print (&rules[r], previous_lhs, out); + previous_lhs = rules[r].lhs; - for (sp = rules[rule].rhs; sp < sp1; sp++) - fprintf (out, " %s", symbol_tag_get (symbols[*sp])); + for (sp = rules[r].rhs; sp < sp1; sp++) + fprintf (out, " %s", symbols[*sp]->tag); fputs (" .", out); for (/* Nothing */; *sp >= 0; ++sp) - fprintf (out, " %s", symbol_tag_get (symbols[*sp])); + fprintf (out, " %s", symbols[*sp]->tag); - /* Display the lookaheads? */ - if (report_flag & report_lookaheads) - state_rule_lookaheads_print (state, &rules[rule], out); + /* Display the lookahead tokens? */ + if (report_flag & report_lookahead_tokens + && item_number_is_rule_number (*sp1)) + state_rule_lookahead_tokens_print (s, &rules[r], out); fputc ('\n', out); } } -/*----------------------------------------------------------------. -| Report the shifts iff DISPLAY_SHIFTS_P or the gotos of STATE on | -| OUT. | -`----------------------------------------------------------------*/ +/*------------------------------------------------------------. +| Report the shifts iff DISPLAY_SHIFTS_P or the gotos of S on | +| OUT. | +`------------------------------------------------------------*/ static void -print_transitions (state_t *state, FILE *out, bool display_transitions_p) +print_transitions (state *s, FILE *out, bool display_transitions_p) { - transitions_t *transitions = state->shifts; + transitions *trans = s->transitions; size_t width = 0; int i; - /* Compute the width of the lookaheads column. */ - for (i = 0; i < transitions->num; i++) - if (!TRANSITION_IS_DISABLED (transitions, i) - && TRANSITION_IS_SHIFT (transitions, i) == display_transitions_p) + /* Compute the width of the lookahead token column. */ + for (i = 0; i < trans->num; i++) + if (!TRANSITION_IS_DISABLED (trans, i) + && TRANSITION_IS_SHIFT (trans, i) == display_transitions_p) { - symbol_t *symbol = symbols[TRANSITION_SYMBOL (transitions, i)]; - max_length (&width, symbol_tag_get (symbol)); + symbol *sym = symbols[TRANSITION_SYMBOL (trans, i)]; + max_length (&width, sym->tag); } /* Nothing to report. */ @@ -145,42 +147,42 @@ print_transitions (state_t *state, FILE *out, bool display_transitions_p) fputc ('\n', out); width += 2; - /* Report lookaheads and shifts. */ - for (i = 0; i < transitions->num; i++) - if (!TRANSITION_IS_DISABLED (transitions, i) - && TRANSITION_IS_SHIFT (transitions, i) == display_transitions_p) + /* Report lookahead tokens and shifts. */ + for (i = 0; i < trans->num; i++) + if (!TRANSITION_IS_DISABLED (trans, i) + && TRANSITION_IS_SHIFT (trans, i) == display_transitions_p) { - symbol_t *symbol = symbols[TRANSITION_SYMBOL (transitions, i)]; - const char *tag = symbol_tag_get (symbol); - state_number_t state1 = transitions->states[i]; + symbol *sym = symbols[TRANSITION_SYMBOL (trans, i)]; + const char *tag = sym->tag; + state *s1 = trans->states[i]; int j; fprintf (out, " %s", tag); for (j = width - strlen (tag); j > 0; --j) fputc (' ', out); if (display_transitions_p) - fprintf (out, _("shift, and go to state %d\n"), state1); + fprintf (out, _("shift, and go to state %d\n"), s1->number); else - fprintf (out, _("go to state %d\n"), state1); + fprintf (out, _("go to state %d\n"), s1->number); } } -/*------------------------------------------------------------. -| Report the explicit errors of STATE raised from %nonassoc. | -`------------------------------------------------------------*/ +/*--------------------------------------------------------. +| Report the explicit errors of S raised from %nonassoc. | +`--------------------------------------------------------*/ static void -print_errs (FILE *out, state_t *state) +print_errs (FILE *out, state *s) { - errs_t *errp = state->errs; + errs *errp = s->errs; size_t width = 0; int i; - /* Compute the width of the lookaheads column. */ - for (i = 0; i < errp->nerrs; ++i) - if (errp->errs[i]) - max_length (&width, symbol_tag_get (symbols[errp->errs[i]])); + /* Compute the width of the lookahead token column. */ + for (i = 0; i < errp->num; ++i) + if (errp->symbols[i]) + max_length (&width, errp->symbols[i]->tag); /* Nothing to report. */ if (!width) @@ -189,11 +191,11 @@ print_errs (FILE *out, state_t *state) fputc ('\n', out); width += 2; - /* Report lookaheads and errors. */ - for (i = 0; i < errp->nerrs; ++i) - if (errp->errs[i]) + /* Report lookahead tokens and errors. */ + for (i = 0; i < errp->num; ++i) + if (errp->symbols[i]) { - const char *tag = symbol_tag_get (symbols[errp->errs[i]]); + const char *tag = errp->symbols[i]->tag; int j; fprintf (out, " %s", tag); for (j = width - strlen (tag); j > 0; --j) @@ -203,143 +205,84 @@ print_errs (FILE *out, state_t *state) } -/*----------------------------------------------------------. -| Return the default rule of this STATE if it has one, NULL | -| otherwise. | -`----------------------------------------------------------*/ - -static rule_t * -state_default_rule (state_t *state) -{ - reductions_t *redp = state->reductions; - rule_t *default_rule = NULL; - int cmax = 0; - int i; - - /* No need for a lookahead. */ - if (state->consistent) - return &rules[redp->rules[0]]; - - /* 1. Each reduction is possibly masked by the lookaheads on which - we shift (S/R conflicts)... */ - bitset_zero (shiftset); - { - transitions_t *transitions = state->shifts; - for (i = 0; i < transitions->num && TRANSITION_IS_SHIFT (transitions, i); i++) - if (!TRANSITION_IS_DISABLED (transitions, i)) - { - /* If this state has a shift for the error token, don't use a - default rule. */ - if (TRANSITION_IS_ERROR (transitions, i)) - return NULL; - bitset_set (shiftset, TRANSITION_SYMBOL (transitions, i)); - } - } - - /* 2. Each reduction is possibly masked by the lookaheads on which - we raise an error (due to %nonassoc). */ - { - errs_t *errp = state->errs; - for (i = 0; i < errp->nerrs; i++) - if (errp->errs[i]) - bitset_set (shiftset, errp->errs[i]); - } - - for (i = 0; i < state->nlookaheads; ++i) - { - int count = 0; - - /* How many non-masked lookaheads are there for this reduction? - */ - bitset_andn (lookaheadset, state->lookaheads[i], shiftset); - count = bitset_count (lookaheadset); - - if (count > cmax) - { - cmax = count; - default_rule = state->lookaheads_rule[i]; - } - - /* 3. And finally, each reduction is possibly masked by previous - reductions (in R/R conflicts, we keep the first reductions). - */ - bitset_or (shiftset, shiftset, state->lookaheads[i]); - } - - return default_rule; -} - - -/*--------------------------------------------------------------------. -| Report a reduction of RULE on LOOKAHEADS (which can be `default'). | -| If not ENABLED, the rule is masked by a shift or a reduce (S/R and | -| R/R conflicts). | -`--------------------------------------------------------------------*/ +/*-------------------------------------------------------------------------. +| Report a reduction of RULE on LOOKAHEAD_TOKEN (which can be `default'). | +| If not ENABLED, the rule is masked by a shift or a reduce (S/R and | +| R/R conflicts). | +`-------------------------------------------------------------------------*/ static void print_reduction (FILE *out, size_t width, - const char *lookahead, - rule_t *rule, bool enabled) + const char *lookahead_token, + rule *r, bool enabled) { int j; - fprintf (out, " %s", lookahead); - for (j = width - strlen (lookahead); j > 0; --j) + fprintf (out, " %s", lookahead_token); + for (j = width - strlen (lookahead_token); j > 0; --j) fputc (' ', out); if (!enabled) fputc ('[', out); - fprintf (out, _("reduce using rule %d (%s)"), - rule->number - 1, symbol_tag_get (rule->lhs)); + if (r->number) + fprintf (out, _("reduce using rule %d (%s)"), r->number, r->lhs->tag); + else + fprintf (out, _("accept")); if (!enabled) fputc (']', out); fputc ('\n', out); } -/*----------------------------------------------------. -| Report on OUT the reduction actions of this STATE. | -`----------------------------------------------------*/ +/*-------------------------------------------. +| Report on OUT the reduction actions of S. | +`-------------------------------------------*/ static void -print_reductions (FILE *out, state_t *state) +print_reductions (FILE *out, state *s) { - transitions_t *transitions = state->shifts; - reductions_t *redp = state->reductions; - rule_t *default_rule = NULL; + transitions *trans = s->transitions; + reductions *reds = s->reductions; + rule *default_reduction = NULL; size_t width = 0; int i, j; + bool default_reduction_only = true; - if (redp->nreds == 0) + if (reds->num == 0) return; - default_rule = state_default_rule (state); + if (yydefact[s->number] != 0) + default_reduction = &rules[yydefact[s->number] - 1]; - bitset_zero (shiftset); - for (i = 0; i < transitions->num && TRANSITION_IS_SHIFT (transitions, i); i++) - if (!TRANSITION_IS_DISABLED (transitions, i)) - bitset_set (shiftset, TRANSITION_SYMBOL (transitions, i)); + bitset_zero (no_reduce_set); + FOR_EACH_SHIFT (trans, i) + bitset_set (no_reduce_set, TRANSITION_SYMBOL (trans, i)); + for (i = 0; i < s->errs->num; ++i) + if (s->errs->symbols[i]) + bitset_set (no_reduce_set, s->errs->symbols[i]->number); - /* Compute the width of the lookaheads column. */ - if (default_rule) + /* Compute the width of the lookahead token column. */ + if (default_reduction) width = strlen (_("$default")); - for (i = 0; i < ntokens; i++) - { - int count = bitset_test (shiftset, i); - for (j = 0; j < state->nlookaheads; ++j) - if (bitset_test (state->lookaheads[j], i)) - { - if (count == 0) - { - if (state->lookaheads_rule[j] != default_rule) - max_length (&width, symbol_tag_get (symbols[i])); - count++; - } - else - { - max_length (&width, symbol_tag_get (symbols[i])); - } - } - } + if (reds->lookahead_tokens) + for (i = 0; i < ntokens; i++) + { + bool count = bitset_test (no_reduce_set, i); + + for (j = 0; j < reds->num; ++j) + if (bitset_test (reds->lookahead_tokens[j], i)) + { + if (! count) + { + if (reds->rules[j] != default_reduction) + max_length (&width, symbols[i]->tag); + count = true; + } + else + { + max_length (&width, symbols[i]->tag); + } + } + } /* Nothing to report. */ if (!width) @@ -348,90 +291,94 @@ print_reductions (FILE *out, state_t *state) fputc ('\n', out); width += 2; - /* Report lookaheads (or $default) and reductions. */ - for (i = 0; i < ntokens; i++) - { - int defaulted = 0; - int count = bitset_test (shiftset, i); + /* Report lookahead tokens (or $default) and reductions. */ + if (reds->lookahead_tokens) + for (i = 0; i < ntokens; i++) + { + bool defaulted = false; + bool count = bitset_test (no_reduce_set, i); + if (count) + default_reduction_only = false; - for (j = 0; j < state->nlookaheads; ++j) - if (bitset_test (state->lookaheads[j], i)) - { - if (count == 0) - { - if (state->lookaheads_rule[j] != default_rule) - print_reduction (out, width, - symbol_tag_get (symbols[i]), - state->lookaheads_rule[j], TRUE); - else - defaulted = 1; - count++; - } - else - { - if (defaulted) + for (j = 0; j < reds->num; ++j) + if (bitset_test (reds->lookahead_tokens[j], i)) + { + if (! count) + { + if (reds->rules[j] != default_reduction) + { + default_reduction_only = false; + print_reduction (out, width, + symbols[i]->tag, + reds->rules[j], true); + } + else + defaulted = true; + count = true; + } + else + { + default_reduction_only = false; + if (defaulted) + print_reduction (out, width, + symbols[i]->tag, + default_reduction, true); + defaulted = false; print_reduction (out, width, - symbol_tag_get (symbols[i]), - default_rule, TRUE); - defaulted = 0; - print_reduction (out, width, - symbol_tag_get (symbols[i]), - state->lookaheads_rule[j], FALSE); - } - } - } + symbols[i]->tag, + reds->rules[j], false); + } + } + } - if (default_rule) - print_reduction (out, width, - _("$default"), default_rule, TRUE); + if (default_reduction) + { + char *default_reductions = + muscle_percent_define_get ("lr.default-reductions"); + print_reduction (out, width, _("$default"), default_reduction, true); + aver (0 == strcmp (default_reductions, "most") + || (0 == strcmp (default_reductions, "consistent") + && default_reduction_only) + || (reds->num == 1 && reds->rules[0]->number == 0)); + free (default_reductions); + } } /*--------------------------------------------------------------. | Report on OUT all the actions (shifts, gotos, reductions, and | -| explicit erros from %nonassoc) of STATE. | +| explicit erros from %nonassoc) of S. | `--------------------------------------------------------------*/ static void -print_actions (FILE *out, state_t *state) +print_actions (FILE *out, state *s) { - reductions_t *redp = state->reductions; - transitions_t *transitions = state->shifts; - - if (transitions->num == 0 && redp->nreds == 0) - { - fputc ('\n', out); - if (state->number == final_state->number) - fprintf (out, _(" $default\taccept\n")); - else - fprintf (out, _(" NO ACTIONS\n")); - return; - } - /* Print shifts. */ - print_transitions (state, out, TRUE); - print_errs (out, state); - print_reductions (out, state); + print_transitions (s, out, true); + print_errs (out, s); + print_reductions (out, s); /* Print gotos. */ - print_transitions (state, out, FALSE); + print_transitions (s, out, false); } -/*--------------------------------------. -| Report all the data on STATE on OUT. | -`--------------------------------------*/ +/*----------------------------------. +| Report all the data on S on OUT. | +`----------------------------------*/ static void -print_state (FILE *out, state_t *state) +print_state (FILE *out, state *s) { fputs ("\n\n", out); - fprintf (out, _("state %d"), state->number); + fprintf (out, _("state %d"), s->number); fputc ('\n', out); - print_core (out, state); - print_actions (out, state); - if ((report_flag & report_solved_conflicts) - && state->solved_conflicts) - fputs (state->solved_conflicts, out); + print_core (out, s); + print_actions (out, s); + if ((report_flag & report_solved_conflicts) && s->solved_conflicts) + { + fputc ('\n', out); + fputs (s->solved_conflicts, out); + } } /*-----------------------------------------. @@ -452,7 +399,7 @@ do { \ static void print_grammar (FILE *out) { - symbol_number_t i; + symbol_number i; char buffer[90]; int column = 0; @@ -463,22 +410,22 @@ print_grammar (FILE *out) for (i = 0; i < max_user_token_number + 1; i++) if (token_translations[i] != undeftoken->number) { - const char *tag = symbol_tag_get (symbols[token_translations[i]]); - rule_number_t r; - item_number_t *rhsp; + const char *tag = symbols[token_translations[i]]->tag; + rule_number r; + item_number *rhsp; buffer[0] = 0; column = strlen (tag); fputs (tag, out); - END_TEST (50); + END_TEST (65); sprintf (buffer, " (%d)", i); - for (r = 1; r < nrules + 1; r++) + for (r = 0; r < nrules; r++) for (rhsp = rules[r].rhs; *rhsp >= 0; rhsp++) if (item_number_as_symbol_number (*rhsp) == token_translations[i]) { END_TEST (65); - sprintf (buffer + strlen (buffer), " %d", r - 1); + sprintf (buffer + strlen (buffer), " %d", r); break; } fprintf (out, "%s\n", buffer); @@ -490,12 +437,12 @@ print_grammar (FILE *out) for (i = ntokens; i < nsyms; i++) { int left_count = 0, right_count = 0; - rule_number_t r; - const char *tag = symbol_tag_get (symbols[i]); + rule_number r; + const char *tag = symbols[i]->tag; - for (r = 1; r < nrules + 1; r++) + for (r = 0; r < nrules; r++) { - item_number_t *rhsp; + item_number *rhsp; if (rules[r].lhs->number == i) left_count++; for (rhsp = rules[r].rhs; *rhsp >= 0; rhsp++) @@ -514,14 +461,16 @@ print_grammar (FILE *out) if (left_count > 0) { - END_TEST (50); + END_TEST (65); sprintf (buffer + strlen (buffer), _(" on left:")); - for (r = 1; r < nrules + 1; r++) + for (r = 0; r < nrules; r++) { - END_TEST (65); if (rules[r].lhs->number == i) - sprintf (buffer + strlen (buffer), " %d", r - 1); + { + END_TEST (65); + sprintf (buffer + strlen (buffer), " %d", r); + } } } @@ -529,16 +478,16 @@ print_grammar (FILE *out) { if (left_count > 0) sprintf (buffer + strlen (buffer), ","); - END_TEST (50); + END_TEST (65); sprintf (buffer + strlen (buffer), _(" on right:")); - for (r = 1; r < nrules + 1; r++) + for (r = 0; r < nrules; r++) { - item_number_t *rhsp; + item_number *rhsp; for (rhsp = rules[r].rhs; *rhsp >= 0; rhsp++) if (item_number_as_symbol_number (*rhsp) == i) { END_TEST (65); - sprintf (buffer + strlen (buffer), " %d", r - 1); + sprintf (buffer + strlen (buffer), " %d", r); break; } } @@ -550,13 +499,16 @@ print_grammar (FILE *out) void print_results (void) { - state_number_t i; + state_number i; /* We used to use just .out if SPEC_NAME_PREFIX (-p) was used, but that conflicts with Posix. */ FILE *out = xfopen (spec_verbose_file, "w"); reduce_output (out); + grammar_rules_partial_print (out, + _("Rules useless in parser due to conflicts"), + rule_useless_in_parser_p); conflicts_output (out); print_grammar (out); @@ -566,12 +518,10 @@ print_results (void) if (report_flag & report_itemsets) new_closure (nritems); /* Storage for print_reductions. */ - shiftset = bitset_create (ntokens, BITSET_FIXED); - lookaheadset = bitset_create (ntokens, BITSET_FIXED); + no_reduce_set = bitset_create (ntokens, BITSET_FIXED); for (i = 0; i < nstates; i++) print_state (out, states[i]); - bitset_free (shiftset); - bitset_free (lookaheadset); + bitset_free (no_reduce_set); if (report_flag & report_itemsets) free_closure ();