X-Git-Url: https://git.saurik.com/bison.git/blobdiff_plain/a17e599f81825bc01cb237925f34ccc67b51a9a0..86649705b4dc7a12e753405a3946ec36ba6a0bb9:/src/conflicts.c?ds=sidebyside diff --git a/src/conflicts.c b/src/conflicts.c index e26a7adf..ba0b6ed3 100644 --- a/src/conflicts.c +++ b/src/conflicts.c @@ -1,77 +1,246 @@ -/* Find and resolve or report look-ahead conflicts for bison, - Copyright 1984, 1989, 1992, 2000, 2001 Free Software Foundation, Inc. +/* Find and resolve or report lookahead conflicts for bison, + + Copyright (C) 1984, 1989, 1992, 2000-2007, 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 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. + 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 3 of the License, 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. + 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 + +#include "LR0.h" #include "complain.h" -#include "getargs.h" +#include "conflicts.h" #include "files.h" +#include "getargs.h" #include "gram.h" -#include "state.h" #include "lalr.h" -#include "conflicts.h" +#include "print-xml.h" #include "reader.h" -#include "LR0.h" +#include "state.h" +#include "symtab.h" -errs **err_table = NULL; /* -1 stands for not specified. */ -int expected_conflicts = -1; -static char *conflicts = NULL; +int expected_sr_conflicts = -1; +int expected_rr_conflicts = -1; +static char *conflicts; +static struct obstack solved_conflicts_obstack; +static struct obstack solved_conflicts_xml_obstack; + +static bitset shift_set; +static bitset lookahead_set; -static unsigned *shiftset = NULL; -static unsigned *lookaheadset = NULL; +enum conflict_resolution + { + shift_resolution, + reduce_resolution, + left_resolution, + right_resolution, + nonassoc_resolution + }; + + +/*----------------------------------------------------------------. +| Explain how an SR conflict between TOKEN and RULE was resolved: | +| RESOLUTION. | +`----------------------------------------------------------------*/ + static inline void -log_resolution (int state, int LAno, int token, char *resolution) +log_resolution (rule *r, symbol_number token, + enum conflict_resolution resolution) { - obstack_fgrow4 (&output_obstack, - _("\ -Conflict in state %d between rule %d and token %s resolved as %s.\n"), - state, LAruleno[LAno], tags[token], resolution); + if (report_flag & report_solved_conflicts) + { + /* The description of the resolution. */ + switch (resolution) + { + case shift_resolution: + case right_resolution: + obstack_printf (&solved_conflicts_obstack, + _(" Conflict between rule %d and token %s" + " resolved as shift"), + r->number, + symbols[token]->tag); + break; + + case reduce_resolution: + case left_resolution: + obstack_printf (&solved_conflicts_obstack, + _(" Conflict between rule %d and token %s" + " resolved as reduce"), + r->number, + symbols[token]->tag); + break; + + case nonassoc_resolution: + obstack_printf (&solved_conflicts_obstack, + _(" Conflict between rule %d and token %s" + " resolved as an error"), + r->number, + symbols[token]->tag); + break; + } + + /* The reason. */ + switch (resolution) + { + case shift_resolution: + obstack_printf (&solved_conflicts_obstack, + " (%s < %s)", + r->prec->tag, + symbols[token]->tag); + break; + + case reduce_resolution: + obstack_printf (&solved_conflicts_obstack, + " (%s < %s)", + symbols[token]->tag, + r->prec->tag); + break; + + case left_resolution: + obstack_printf (&solved_conflicts_obstack, + " (%%left %s)", + symbols[token]->tag); + break; + + case right_resolution: + obstack_printf (&solved_conflicts_obstack, + " (%%right %s)", + symbols[token]->tag); + break; + + case nonassoc_resolution: + obstack_printf (&solved_conflicts_obstack, + " (%%nonassoc %s)", + symbols[token]->tag); + break; + } + + obstack_sgrow (&solved_conflicts_obstack, ".\n"); + } + + /* XML report */ + if (xml_flag) + { + /* The description of the resolution. */ + switch (resolution) + { + case shift_resolution: + case right_resolution: + obstack_printf (&solved_conflicts_xml_obstack, + " ", + r->number, + xml_escape (symbols[token]->tag)); + break; + + case reduce_resolution: + case left_resolution: + obstack_printf (&solved_conflicts_xml_obstack, + " ", + r->number, + xml_escape (symbols[token]->tag)); + break; + + case nonassoc_resolution: + obstack_printf (&solved_conflicts_xml_obstack, + " ", + r->number, + xml_escape (symbols[token]->tag)); + break; + } + + /* The reason. */ + switch (resolution) + { + case shift_resolution: + obstack_printf (&solved_conflicts_xml_obstack, + "%s < %s", + xml_escape_n (0, r->prec->tag), + xml_escape_n (1, symbols[token]->tag)); + break; + + case reduce_resolution: + obstack_printf (&solved_conflicts_xml_obstack, + "%s < %s", + xml_escape_n (0, symbols[token]->tag), + xml_escape_n (1, r->prec->tag)); + break; + + case left_resolution: + obstack_printf (&solved_conflicts_xml_obstack, + "%%left %s", + xml_escape (symbols[token]->tag)); + break; + + case right_resolution: + obstack_printf (&solved_conflicts_xml_obstack, + "%%right %s", + xml_escape (symbols[token]->tag)); + break; + + case nonassoc_resolution: + obstack_printf (&solved_conflicts_xml_obstack, + "%%nonassoc %s", + xml_escape (symbols[token]->tag)); + break; + } + + obstack_sgrow (&solved_conflicts_xml_obstack, "\n"); + } } /*------------------------------------------------------------------. | Turn off the shift recorded for the specified token in the | | specified state. Used when we resolve a shift-reduce conflict in | -| favor of the reduction. | +| favor of the reduction or as an error (%nonassoc). | `------------------------------------------------------------------*/ static void -flush_shift (int state, int token) +flush_shift (state *s, int token) { - shifts *shiftp; - int k, i; + transitions *trans = s->transitions; + int i; - shiftp = state_table[state].shift_table; + bitset_reset (lookahead_set, token); + for (i = 0; i < trans->num; i++) + if (!TRANSITION_IS_DISABLED (trans, i) + && TRANSITION_SYMBOL (trans, i) == token) + TRANSITION_DISABLE (trans, i); +} - if (shiftp) - { - k = shiftp->nshifts; - for (i = 0; i < k; i++) - { - if (shiftp->shifts[i] - && token == state_table[shiftp->shifts[i]].accessing_symbol) - (shiftp->shifts[i]) = 0; - } - } + +/*--------------------------------------------------------------------. +| Turn off the reduce recorded for the specified token in the | +| specified lookahead set. Used when we resolve a shift-reduce | +| conflict in favor of the shift or as an error (%nonassoc). | +`--------------------------------------------------------------------*/ + +static void +flush_reduce (bitset lookahead_tokens, int token) +{ + bitset_reset (lookahead_tokens, token); } @@ -80,171 +249,173 @@ flush_shift (int state, int token) | precedence declarations. It has already been checked that the | | rule has a precedence. A conflict is resolved by modifying the | | shift or reduce tables so that there is no longer a conflict. | +| | +| RULENO is the number of the lookahead bitset to consider. | +| | +| ERRORS and NERRS can be used to store discovered explicit | +| errors. | `------------------------------------------------------------------*/ static void -resolve_sr_conflict (int state, int lookaheadnum) +resolve_sr_conflict (state *s, int ruleno, symbol **errors, int *nerrs) { - int i; - int mask; - unsigned *fp1; - unsigned *fp2; - int redprec; - errs *errp = ERRS_ALLOC (ntokens + 1); - short *errtokens = errp->errs; - - /* find the rule to reduce by to get precedence of reduction */ - redprec = rule_table[LAruleno[lookaheadnum]].prec; - - mask = 1; - fp1 = LA (lookaheadnum); - fp2 = lookaheadset; + symbol_number i; + reductions *reds = s->reductions; + /* Find the rule to reduce by to get precedence of reduction. */ + rule *redrule = reds->rules[ruleno]; + int redprec = redrule->prec->prec; + bitset lookahead_tokens = reds->lookahead_tokens[ruleno]; + for (i = 0; i < ntokens; i++) - { - if ((mask & *fp2 & *fp1) && sprec[i]) + if (bitset_test (lookahead_tokens, i) + && bitset_test (lookahead_set, i) + && symbols[i]->prec) + { /* Shift-reduce conflict occurs for token number i and it has a precedence. The precedence of shifting is that of token i. */ - { - if (sprec[i] < redprec) - { - log_resolution (state, lookaheadnum, i, _("reduce")); - *fp2 &= ~mask; /* flush the shift for this token */ - flush_shift (state, i); - } - else if (sprec[i] > redprec) - { - log_resolution (state, lookaheadnum, i, _("shift")); - *fp1 &= ~mask; /* flush the reduce for this token */ - } - else + if (symbols[i]->prec < redprec) + { + log_resolution (redrule, i, reduce_resolution); + flush_shift (s, i); + } + else if (symbols[i]->prec > redprec) + { + log_resolution (redrule, i, shift_resolution); + flush_reduce (lookahead_tokens, i); + } + else + /* Matching precedence levels. + For left association, keep only the reduction. + For right association, keep only the shift. + For nonassociation, keep neither. */ + + switch (symbols[i]->assoc) { - /* Matching precedence levels. - For left association, keep only the reduction. - For right association, keep only the shift. - For nonassociation, keep neither. */ - - switch (sassoc[i]) - { - case right_assoc: - log_resolution (state, lookaheadnum, i, _("shift")); - break; - - case left_assoc: - log_resolution (state, lookaheadnum, i, _("reduce")); - break; - - case non_assoc: - log_resolution (state, lookaheadnum, i, _("an error")); - break; - } - - if (sassoc[i] != right_assoc) - { - *fp2 &= ~mask; /* flush the shift for this token */ - flush_shift (state, i); - } - if (sassoc[i] != left_assoc) - { - *fp1 &= ~mask; /* flush the reduce for this token */ - } - if (sassoc[i] == non_assoc) - { - /* Record an explicit error for this token. */ - *errtokens++ = i; - } + default: + abort (); + + case right_assoc: + log_resolution (redrule, i, right_resolution); + flush_reduce (lookahead_tokens, i); + break; + + case left_assoc: + log_resolution (redrule, i, left_resolution); + flush_shift (s, i); + break; + + case non_assoc: + log_resolution (redrule, i, nonassoc_resolution); + flush_shift (s, i); + flush_reduce (lookahead_tokens, i); + /* Record an explicit error for this token. */ + errors[(*nerrs)++] = symbols[i]; + break; } - } - - mask <<= 1; - if (mask == 0) - { - mask = 1; - fp2++; - fp1++; - } - } - errp->nerrs = errtokens - errp->errs; - if (errp->nerrs) - { - /* Some tokens have been explicitly made errors. Allocate - a permanent errs structure for this state, to record them. */ - i = (char *) errtokens - (char *) errp; - err_table[state] = ERRS_ALLOC (i + 1); - bcopy (errp, err_table[state], i); - } - else - err_table[state] = 0; - free (errp); + } } +/*-------------------------------------------------------------------. +| Solve the S/R conflicts of state S using the | +| precedence/associativity, and flag it inconsistent if it still has | +| conflicts. ERRORS can be used as storage to compute the list of | +| lookahead tokens on which S raises a syntax error (%nonassoc). | +`-------------------------------------------------------------------*/ + static void -set_conflicts (int state) +set_conflicts (state *s, symbol **errors) { - int i, j; - shifts *shiftp; - int symbol; + int i; + transitions *trans = s->transitions; + reductions *reds = s->reductions; + int nerrs = 0; - if (state_table[state].consistent) + if (s->consistent) return; - for (i = 0; i < tokensetsize; i++) - lookaheadset[i] = 0; + bitset_zero (lookahead_set); - shiftp = state_table[state].shift_table; - if (shiftp) - for (i = 0; i < shiftp->nshifts; i++) - { - symbol = state_table[shiftp->shifts[i]].accessing_symbol; - if (ISVAR (symbol)) - break; - SETBIT (lookaheadset, symbol); - } + FOR_EACH_SHIFT (trans, i) + bitset_set (lookahead_set, TRANSITION_SYMBOL (trans, i)); /* Loop over all rules which require lookahead in this state. First check for shift-reduce conflict, and try to resolve using - precedence */ - for (i = state_table[state].lookaheads; - i < state_table[state + 1].lookaheads; - ++i) - if (rule_table[LAruleno[i]].prec) - for (j = 0; j < tokensetsize; ++j) - if (LA (i)[j] & lookaheadset[j]) - { - resolve_sr_conflict (state, i); - break; - } + precedence. */ + for (i = 0; i < reds->num; ++i) + if (reds->rules[i]->prec && reds->rules[i]->prec->prec + && !bitset_disjoint_p (reds->lookahead_tokens[i], lookahead_set)) + resolve_sr_conflict (s, i, errors, &nerrs); + if (nerrs) + { + /* Some tokens have been explicitly made errors. Allocate a + permanent errs structure for this state, to record them. */ + state_errs_set (s, nerrs, errors); + } + if (obstack_object_size (&solved_conflicts_obstack)) + { + obstack_1grow (&solved_conflicts_obstack, '\0'); + s->solved_conflicts = obstack_finish (&solved_conflicts_obstack); + } + if (obstack_object_size (&solved_conflicts_xml_obstack)) + { + obstack_1grow (&solved_conflicts_xml_obstack, '\0'); + s->solved_conflicts_xml = obstack_finish (&solved_conflicts_xml_obstack); + } /* Loop over all rules which require lookahead in this state. Check for conflicts not resolved above. */ - for (i = state_table[state].lookaheads; - i < state_table[state + 1].lookaheads; - ++i) + for (i = 0; i < reds->num; ++i) { - for (j = 0; j < tokensetsize; ++j) - if (LA (i)[j] & lookaheadset[j]) - conflicts[state] = 1; - - for (j = 0; j < tokensetsize; ++j) - lookaheadset[j] |= LA (i)[j]; + if (!bitset_disjoint_p (reds->lookahead_tokens[i], lookahead_set)) + conflicts[s->number] = 1; + bitset_or (lookahead_set, lookahead_set, reds->lookahead_tokens[i]); } } + +/*----------------------------------------------------------------. +| Solve all the S/R conflicts using the precedence/associativity, | +| and flag as inconsistent the states that still have conflicts. | +`----------------------------------------------------------------*/ + void -solve_conflicts (void) +conflicts_solve (void) { - int i; - - conflicts = XCALLOC (char, nstates); - shiftset = XCALLOC (unsigned, tokensetsize); - lookaheadset = XCALLOC (unsigned, tokensetsize); + state_number i; + /* List of lookahead tokens on which we explicitly raise a syntax error. */ + symbol **errors = xnmalloc (ntokens + 1, sizeof *errors); - err_table = XCALLOC (errs *, nstates); + conflicts = xcalloc (nstates, sizeof *conflicts); + shift_set = bitset_create (ntokens, BITSET_FIXED); + lookahead_set = bitset_create (ntokens, BITSET_FIXED); + obstack_init (&solved_conflicts_obstack); + obstack_init (&solved_conflicts_xml_obstack); for (i = 0; i < nstates; i++) - set_conflicts (i); + { + set_conflicts (states[i], errors); + + /* For uniformity of the code, make sure all the states have a valid + `errs' member. */ + if (!states[i]->errs) + states[i]->errs = errs_new (0, 0); + } + + free (errors); +} + + +void +conflicts_update_state_numbers (state_number old_to_new[], + state_number nstates_old) +{ + state_number i; + for (i = 0; i < nstates_old; ++i) + if (old_to_new[i] != nstates_old) + conflicts[old_to_new[i]] = conflicts[i]; } @@ -253,162 +424,77 @@ solve_conflicts (void) `---------------------------------------------*/ static int -count_sr_conflicts (int state) +count_sr_conflicts (state *s) { int i; - int k; - int mask; - shifts *shiftp; - unsigned *fp1; - unsigned *fp2; - unsigned *fp3; - int symbol; - int src_count = 0; + transitions *trans = s->transitions; + reductions *reds = s->reductions; - shiftp = state_table[state].shift_table; - if (!shiftp) + if (!trans) return 0; - for (i = 0; i < tokensetsize; i++) - { - shiftset[i] = 0; - lookaheadset[i] = 0; - } + bitset_zero (lookahead_set); + bitset_zero (shift_set); - k = shiftp->nshifts; - for (i = 0; i < k; i++) - { - if (!shiftp->shifts[i]) - continue; - symbol = state_table[shiftp->shifts[i]].accessing_symbol; - if (ISVAR (symbol)) - break; - SETBIT (shiftset, symbol); - } - - k = state_table[state + 1].lookaheads; - fp3 = lookaheadset + tokensetsize; + FOR_EACH_SHIFT (trans, i) + bitset_set (shift_set, TRANSITION_SYMBOL (trans, i)); - for (i = state_table[state].lookaheads; i < k; i++) - { - fp1 = LA (i); - fp2 = lookaheadset; - - while (fp2 < fp3) - *fp2++ |= *fp1++; - } + for (i = 0; i < reds->num; ++i) + bitset_or (lookahead_set, lookahead_set, reds->lookahead_tokens[i]); - fp1 = shiftset; - fp2 = lookaheadset; + bitset_and (lookahead_set, lookahead_set, shift_set); - while (fp2 < fp3) - *fp2++ &= *fp1++; - - mask = 1; - fp2 = lookaheadset; - for (i = 0; i < ntokens; i++) - { - if (mask & *fp2) - src_count++; - - mask <<= 1; - if (mask == 0) - { - mask = 1; - fp2++; - } - } + src_count = bitset_count (lookahead_set); return src_count; } -/*----------------------------------------------. -| Count the number of reduce/reduce conflicts. | -`----------------------------------------------*/ +/*----------------------------------------------------------------. +| Count the number of reduce/reduce conflicts. If ONE_PER_TOKEN, | +| count one conflict for each token that has any reduce/reduce | +| conflicts. Otherwise, count one conflict for each pair of | +| conflicting reductions. | ++`----------------------------------------------------------------*/ static int -count_rr_conflicts (int state) +count_rr_conflicts (state *s, bool one_per_token) { int i; - unsigned mask; - unsigned *baseword; - + reductions *reds = s->reductions; int rrc_count = 0; - int m = state_table[state].lookaheads; - int n = state_table[state + 1].lookaheads; - - if (n - m < 2) - return 0; - - mask = 1; - baseword = LA (m); for (i = 0; i < ntokens; i++) { - unsigned *wordp = baseword; - int count = 0; int j; - for (j = m; j < n; j++) - { - if (mask & *wordp) - count++; - - wordp += tokensetsize; - } + for (j = 0; j < reds->num; ++j) + if (bitset_test (reds->lookahead_tokens[j], i)) + count++; if (count >= 2) - rrc_count++; - - mask <<= 1; - if (mask == 0) - { - mask = 1; - baseword++; - } + rrc_count += one_per_token ? 1 : count-1; } return rrc_count; } -/*--------------------------------------------------------------. -| Return a human readable string which reports shift/reduce and | -| reduce/reduce conflict numbers (SRC_NUM, RRC_NUM). | -`--------------------------------------------------------------*/ - -static const char * -conflict_report (int src_num, int rrc_num) -{ - static char res[4096]; - char *cp = res; - - if (src_num >= 1) - { - sprintf (cp, ngettext ("%d shift/reduce conflict", - "%d shift/reduce conflicts", src_num), src_num); - cp += strlen (cp); - } - - if (src_num > 0 && rrc_num > 0) - { - sprintf (cp, " %s ", _("and")); - cp += strlen (cp); - } - - if (rrc_num >= 1) - { - sprintf (cp, ngettext ("%d reduce/reduce conflict", - "%d reduce/reduce conflicts", rrc_num), rrc_num); - cp += strlen (cp); - } - *cp++ = '.'; - *cp++ = '\n'; - *cp++ = '\0'; +/*--------------------------------------------------------. +| Report the number of conflicts, using the Yacc format. | +`--------------------------------------------------------*/ - return res; +static void +conflict_report (FILE *out, int src_num, int rrc_num) +{ + if (src_num && rrc_num) + fprintf (out, _("conflicts: %d shift/reduce, %d reduce/reduce\n"), + src_num, rrc_num); + else if (src_num) + fprintf (out, _("conflicts: %d shift/reduce\n"), src_num); + else if (rrc_num) + fprintf (out, _("conflicts: %d reduce/reduce\n"), rrc_num); } @@ -419,18 +505,45 @@ conflict_report (int src_num, int rrc_num) void conflicts_output (FILE *out) { - bool printed_sth = FALSE; - int i; + bool printed_sth = false; + state_number i; + for (i = 0; i < nstates; i++) + { + state *s = states[i]; + if (conflicts[i]) + { + fprintf (out, _("State %d "), i); + conflict_report (out, count_sr_conflicts (s), + count_rr_conflicts (s, true)); + printed_sth = true; + } + } + if (printed_sth) + fputs ("\n\n", out); +} + +/*--------------------------------------------------------. +| Total the number of S/R and R/R conflicts. Unlike the | +| code in conflicts_output, however, count EACH pair of | +| reductions for the same state and lookahead as one | +| conflict. | +`--------------------------------------------------------*/ + +int +conflicts_total_count (void) +{ + state_number i; + int count; + + /* Conflicts by state. */ + count = 0; for (i = 0; i < nstates; i++) if (conflicts[i]) { - fprintf (out, _("State %d contains "), i); - fputs (conflict_report (count_sr_conflicts (i), - count_rr_conflicts (i)), out); - printed_sth = TRUE; + count += count_sr_conflicts (states[i]); + count += count_rr_conflicts (states[i], false); } - if (printed_sth) - fputs ("\n\n", out); + return count; } @@ -441,265 +554,84 @@ conflicts_output (FILE *out) void conflicts_print (void) { - int i; - /* Is the number of SR conflicts OK? Either EXPECTED_CONFLICTS is not set, and then we want 0 SR, or else it is specified, in which case we want equality. */ - int src_ok = 0; + bool src_ok; + bool rrc_ok; int src_total = 0; int rrc_total = 0; + int src_expected; + int rrc_expected; /* Conflicts by state. */ - for (i = 0; i < nstates; i++) - if (conflicts[i]) - { - src_total += count_sr_conflicts (i); - rrc_total += count_rr_conflicts (i); - } + { + state_number i; - src_ok = src_total == (expected_conflicts == -1 ? 0 : expected_conflicts); - - /* If there are no RR conflicts, and as many SR conflicts as - expected, then there is nothing to report. */ - if (!rrc_total && src_ok) - return; - - /* Report the total number of conflicts on STDERR. */ - if (yacc_flag) - { - /* If invoked with `--yacc', use the output format specified by - POSIX. */ - fprintf (stderr, _("conflicts: ")); - if (src_total > 0) - fprintf (stderr, _(" %d shift/reduce"), src_total); - if (src_total > 0 && rrc_total > 0) - fprintf (stderr, ","); - if (rrc_total > 0) - fprintf (stderr, _(" %d reduce/reduce"), rrc_total); - putc ('\n', stderr); - } - else - { - fprintf (stderr, _("%s contains "), infile); - fputs (conflict_report (src_total, rrc_total), stderr); - } + for (i = 0; i < nstates; i++) + if (conflicts[i]) + { + src_total += count_sr_conflicts (states[i]); + rrc_total += count_rr_conflicts (states[i], true); + } + } - if (expected_conflicts != -1 && !src_ok) + if (! glr_parser && rrc_total > 0 && expected_rr_conflicts != -1) { - complain_message_count++; - fprintf (stderr, ngettext ("expected %d shift/reduce conflict\n", - "expected %d shift/reduce conflicts\n", - expected_conflicts), - expected_conflicts); + warn (_("%%expect-rr applies only to GLR parsers")); + expected_rr_conflicts = -1; } -} + src_expected = expected_sr_conflicts == -1 ? 0 : expected_sr_conflicts; + rrc_expected = expected_rr_conflicts == -1 ? 0 : expected_rr_conflicts; + src_ok = src_total == src_expected; + rrc_ok = rrc_total == rrc_expected; -void -print_reductions (FILE *out, int state) -{ - int i; - int j; - int symbol; - unsigned mask; - int m; - int n; - int default_LA; - int default_rule = 0; - int cmax; - int count; - shifts *shiftp; - errs *errp; - int nodefault = 0; - - for (i = 0; i < tokensetsize; i++) - shiftset[i] = 0; - - shiftp = state_table[state].shift_table; - if (shiftp) - for (i = 0; i < shiftp->nshifts; i++) - { - if (!shiftp->shifts[i]) - continue; - symbol = state_table[shiftp->shifts[i]].accessing_symbol; - if (ISVAR (symbol)) - break; - /* if this state has a shift for the error token, - don't use a default rule. */ - if (symbol == error_token_number) - nodefault = 1; - SETBIT (shiftset, symbol); - } + /* If there are as many RR conflicts and SR conflicts as + expected, then there is nothing to report. */ + if (rrc_ok & src_ok) + return; - errp = err_table[state]; - if (errp) + /* Report the total number of conflicts on STDERR. */ + if (expected_sr_conflicts == -1 && expected_rr_conflicts == -1) { - for (i = 0; i < errp->nerrs; i++) - { - if (!errp->errs[i]) - continue; - SETBIT (shiftset, errp->errs[i]); - } + if (!(warnings_flag & warnings_conflicts_sr)) + src_total = 0; + if (!(warnings_flag & warnings_conflicts_rr)) + rrc_total = 0; } - - m = state_table[state].lookaheads; - n = state_table[state + 1].lookaheads; - - if (n - m == 1 && !nodefault) + if (src_total | rrc_total) { - int k; - default_rule = LAruleno[m]; - - for (k = 0; k < tokensetsize; ++k) - lookaheadset[k] = LA (m)[k] & shiftset[k]; - - for (i = 0; i < ntokens; i++) - if (BITISSET (lookaheadset, i)) - fprintf (out, _(" %-4s\t[reduce using rule %d (%s)]\n"), - tags[i], default_rule, - tags[rule_table[default_rule].lhs]); - - fprintf (out, _(" $default\treduce using rule %d (%s)\n\n"), - default_rule, tags[rule_table[default_rule].lhs]); + if (expected_sr_conflicts == -1 && expected_rr_conflicts == -1) + set_warning_issued (); + if (! yacc_flag) + fprintf (stderr, "%s: ", current_file); + conflict_report (stderr, src_total, rrc_total); } - else if (n - m >= 1) - { - unsigned *fp1, *fp2, *fp3, *fp4; - - cmax = 0; - default_LA = -1; - fp4 = lookaheadset + tokensetsize; - - if (!nodefault) - for (i = m; i < n; i++) - { - fp1 = LA (i); - fp2 = shiftset; - fp3 = lookaheadset; - - while (fp3 < fp4) - *fp3++ = *fp1++ & (~(*fp2++)); - - count = 0; - mask = 1; - fp3 = lookaheadset; - for (j = 0; j < ntokens; j++) - { - if (mask & *fp3) - count++; - - mask <<= 1; - if (mask == 0) - { - mask = 1; - fp3++; - } - } - - if (count > cmax) - { - cmax = count; - default_LA = i; - default_rule = LAruleno[i]; - } - - fp2 = shiftset; - fp3 = lookaheadset; - - while (fp3 < fp4) - *fp2++ |= *fp3++; - } - - for (i = 0; i < tokensetsize; i++) - shiftset[i] = 0; - - if (shiftp) - { - for (i = 0; i < shiftp->nshifts; i++) - { - if (!shiftp->shifts[i]) - continue; - symbol = state_table[shiftp->shifts[i]].accessing_symbol; - if (ISVAR (symbol)) - break; - SETBIT (shiftset, symbol); - } - } - - mask = 1; - fp1 = LA (m); - fp2 = shiftset; - for (i = 0; i < ntokens; i++) - { - int defaulted = 0; - if (mask & *fp2) - count = 1; - else - count = 0; - - fp3 = fp1; - for (j = m; j < n; j++) - { - if (mask & *fp3) - { - if (count == 0) - { - if (j != default_LA) - fprintf (out, - _(" %-4s\treduce using rule %d (%s)\n"), - tags[i], - LAruleno[j], - tags[rule_table[LAruleno[j]].lhs]); - else - defaulted = 1; - - count++; - } - else - { - if (defaulted) - fprintf (out, - _(" %-4s\treduce using rule %d (%s)\n"), - tags[i], - LAruleno[default_LA], - tags[rule_table[LAruleno[default_LA]].lhs]); - defaulted = 0; - fprintf (out, - _(" %-4s\t[reduce using rule %d (%s)]\n"), - tags[i], - LAruleno[j], - tags[rule_table[LAruleno[j]].lhs]); - } - } - - fp3 += tokensetsize; - } - - mask <<= 1; - if (mask == 0) - { - mask = 1; - /* We tried incrementing just fp1, and just fp2; both seem wrong. - It seems necessary to increment both in sync. */ - fp1++; - fp2++; - } - } - - if (default_LA >= 0) - fprintf (out, _(" $default\treduce using rule %d (%s)\n"), - default_rule, tags[rule_table[default_rule].lhs]); + if (expected_sr_conflicts != -1 || expected_rr_conflicts != -1) + { + if (! src_ok) + complain (ngettext ("expected %d shift/reduce conflict", + "expected %d shift/reduce conflicts", + src_expected), + src_expected); + if (! rrc_ok) + complain (ngettext ("expected %d reduce/reduce conflict", + "expected %d reduce/reduce conflicts", + rrc_expected), + rrc_expected); } } void -free_conflicts (void) +conflicts_free (void) { - XFREE (conflicts); - XFREE (shiftset); - XFREE (lookaheadset); + free (conflicts); + bitset_free (shift_set); + bitset_free (lookahead_set); + obstack_free (&solved_conflicts_obstack, NULL); + obstack_free (&solved_conflicts_xml_obstack, NULL); }