regen

[bison.git] / src / conflicts.c

diff --git a/src/conflicts.c b/src/conflicts.c
index a17157a65d402ba8cde7e4f80f8d492c9bdcf3f0..4e05ab32ab37e48dd8191643b393eb9c70f23690 100644 (file)
--- a/src/conflicts.c
+++ b/src/conflicts.c
@@ -1,83 +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, 2009-2013 Free Software
+   Foundation, Inc.

 
    This file is part of Bison, the GNU Compiler Compiler.
 
 
    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
 
    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 <http://www.gnu.org/licenses/>.  */

 
 

+#include <config.h>

 #include "system.h"
 #include "system.h"

+
+#include <bitset.h>
+
+#include "LR0.h"

 #include "complain.h"
 #include "complain.h"

-#include "getargs.h"
-#include "symtab.h"
+#include "conflicts.h"

 #include "files.h"
 #include "files.h"

+#include "getargs.h"

 #include "gram.h"
 #include "gram.h"

-#include "state.h"

 #include "lalr.h"
 #include "lalr.h"

-#include "conflicts.h"
+#include "print-xml.h"

 #include "reader.h"
 #include "reader.h"

-#include "LR0.h"
+#include "state.h"
+#include "symtab.h"

 
 /* -1 stands for not specified. */
 
 /* -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;

 \f
 
 \f
 

+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
 static inline void

-log_resolution (state_t *state, int LAno, int token, char *resolution)
+log_resolution (rule *r, symbol_number token,
+               enum conflict_resolution resolution)

 {
 {

-  if (verbose_flag)
-    obstack_fgrow4 (&output_obstack,
-                   _("\
-Conflict in state %d between rule %d and token %s resolved as %s.\n"),
-                   state->number, 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,
+                          "        <resolution rule=\"%d\" symbol=\"%s\""
+                          " type=\"shift\">",
+                          r->number,
+                          xml_escape (symbols[token]->tag));
+          break;
+
+        case reduce_resolution:
+        case left_resolution:
+          obstack_printf (&solved_conflicts_xml_obstack,
+                          "        <resolution rule=\"%d\" symbol=\"%s\""
+                          " type=\"reduce\">",
+                          r->number,
+                          xml_escape (symbols[token]->tag));
+          break;
+
+        case nonassoc_resolution:
+          obstack_printf (&solved_conflicts_xml_obstack,
+                          "        <resolution rule=\"%d\" symbol=\"%s\""
+                          " type=\"error\">",
+                          r->number,
+                          xml_escape (symbols[token]->tag));
+          break;
+        }
+
+      /* The reason. */
+      switch (resolution)
+        {
+        case shift_resolution:
+          obstack_printf (&solved_conflicts_xml_obstack,
+                          "%s &lt; %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 &lt; %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, "</resolution>\n");
+    }

 }
 
 
 /*------------------------------------------------------------------.
 | Turn off the shift recorded for the specified token in the        |
 | specified state.  Used when we resolve a shift-reduce conflict in |
 }
 
 
 /*------------------------------------------------------------------.
 | 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
 `------------------------------------------------------------------*/
 
 static void

-flush_shift (state_t *state, int token)
+flush_shift (state *s, int token)

 {
 {

-  shifts *shiftp = state->shifts;
+  transitions *trans = s->transitions;

   int i;
 
   int i;
 

-  RESETBIT (lookaheadset, token);
-  for (i = 0; i < shiftp->nshifts; i++)
-    if (!SHIFT_IS_DISABLED (shiftp, i) && SHIFT_SYMBOL (shiftp, i) == token)
-      SHIFT_DISABLE (shiftp, i);
+  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);

 }
 
 
 }
 
 

-/*-------------------------------------------------------------------.
-| Turn off the reduce recorded for the specified token for the       |
-| specified lookahead.  Used when we resolve a shift-reduce conflict |
-| in favor of the shift.                                             |
-`-------------------------------------------------------------------*/
+/*--------------------------------------------------------------------.
+| 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
 
 static void

-flush_reduce (int lookahead, int token)
+flush_reduce (bitset lookahead_tokens, int token)

 {
 {

-  RESETBIT (LA (lookahead), token);
+  bitset_reset (lookahead_tokens, token);

 }
 
 
 }
 
 


@@ -86,20 +249,26 @@ flush_reduce (int lookahead, 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.     |
 | 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
 `------------------------------------------------------------------*/
 
 static void

-resolve_sr_conflict (state_t *state, int lookahead)
+resolve_sr_conflict (state *s, int ruleno, symbol **errors, int *nerrs)

 {
 {

-  int i;
-  /* find the rule to reduce by to get precedence of reduction  */
-  int redprec = rule_table[LAruleno[lookahead]].prec;
-  errs *errp = errs_new (ntokens + 1);
-  errp->nerrs = 0;
+  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++)
 
   for (i = 0; i < ntokens; i++)

-    if (BITISSET (LA (lookahead), i)
-       && BITISSET (lookaheadset, i)
+    if (bitset_test (lookahead_tokens, i)
+       && bitset_test (lookahead_set, i)

        && symbols[i]->prec)
       {
        /* Shift-reduce conflict occurs for token number i
        && symbols[i]->prec)
       {
        /* Shift-reduce conflict occurs for token number i


@@ -107,13 +276,13 @@ resolve_sr_conflict (state_t *state, int lookahead)
           The precedence of shifting is that of token i.  */
        if (symbols[i]->prec < redprec)
          {
           The precedence of shifting is that of token i.  */
        if (symbols[i]->prec < redprec)
          {

-           log_resolution (state, lookahead, i, _("reduce"));
-           flush_shift (state, i);
+           log_resolution (redrule, i, reduce_resolution);
+           flush_shift (s, i);

          }
        else if (symbols[i]->prec > redprec)
          {
          }
        else if (symbols[i]->prec > redprec)
          {

-           log_resolution (state, lookahead, i, _("shift"));
-           flush_reduce (lookahead, i);
+           log_resolution (redrule, i, shift_resolution);
+           flush_reduce (lookahead_tokens, i);

          }
        else
          /* Matching precedence levels.
          }
        else
          /* Matching precedence levels.


@@ -121,89 +290,132 @@ resolve_sr_conflict (state_t *state, int lookahead)
             For right association, keep only the shift.
             For nonassociation, keep neither.  */
 
             For right association, keep only the shift.
             For nonassociation, keep neither.  */
 

-         switch (sassoc[i])
+         switch (symbols[i]->assoc)

            {
            {

+           default:
+             abort ();
+

            case right_assoc:
            case right_assoc:

-             log_resolution (state, lookahead, i, _("shift"));
-             flush_reduce (lookahead, i);
+             log_resolution (redrule, i, right_resolution);
+             flush_reduce (lookahead_tokens, i);

              break;
 
            case left_assoc:
              break;
 
            case left_assoc:

-             log_resolution (state, lookahead, i, _("reduce"));
-             flush_shift (state, i);
+             log_resolution (redrule, i, left_resolution);
+             flush_shift (s, i);

              break;
 
            case non_assoc:
              break;
 
            case non_assoc:

-             log_resolution (state, lookahead, i, _("an error"));
-             flush_shift (state, i);
-             flush_reduce (lookahead, i);
+             log_resolution (redrule, i, nonassoc_resolution);
+             flush_shift (s, i);
+             flush_reduce (lookahead_tokens, i);

              /* Record an explicit error for this token.  */
              /* Record an explicit error for this token.  */

-             errp->errs[errp->nerrs++] = i;
+             errors[(*nerrs)++] = symbols[i];

              break;
            }
       }
              break;
            }
       }

-
-  /* Some tokens have been explicitly made errors.  Allocate a
-     permanent errs structure for this state, to record them.  */
-  state->errs = errs_dup (errp);
-  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
 static void

-set_conflicts (state_t *state)
+set_conflicts (state *s, symbol **errors)

 {
 {

-  int i, j;
-  shifts *shiftp;
+  int i;
+  transitions *trans = s->transitions;
+  reductions *reds = s->reductions;
+  int nerrs = 0;

 
 

-  if (state->consistent)
+  if (s->consistent)

     return;
 
     return;
 

-  for (i = 0; i < tokensetsize; i++)
-    lookaheadset[i] = 0;
+  bitset_zero (lookahead_set);

 
 

-  shiftp = state->shifts;
-  for (i = 0; i < shiftp->nshifts && SHIFT_IS_SHIFT (shiftp, i); i++)
-    if (!SHIFT_IS_DISABLED (shiftp, i))
-      SETBIT (lookaheadset, SHIFT_SYMBOL (shiftp, i));
+  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
 
   /* Loop over all rules which require lookahead in this state.  First
      check for shift-reduce conflict, and try to resolve using

-     precedence */
-  for (i = 0; i < state->nlookaheads; ++i)
-    if (rule_table[LAruleno[state->lookaheadsp + i]].prec)
-      for (j = 0; j < tokensetsize; ++j)
-       if (LA (state->lookaheadsp + i)[j] & lookaheadset[j])
-         {
-           resolve_sr_conflict (state, state->lookaheadsp + 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.  */
 
   /* Loop over all rules which require lookahead in this state.  Check
      for conflicts not resolved above.  */

-  for (i = 0; i < state->nlookaheads; ++i)
+  for (i = 0; i < reds->num; ++i)

     {
     {

-      for (j = 0; j < tokensetsize; ++j)
-       if (LA (state->lookaheadsp + i)[j] & lookaheadset[j])
-         conflicts[state->number] = 1;
-
-      for (j = 0; j < tokensetsize; ++j)
-       lookaheadset[j] |= LA (state->lookaheadsp + 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
 void

-solve_conflicts (void)
+conflicts_solve (void)

 {
 {

-  int i;
+  state_number i;
+  /* List of lookahead tokens on which we explicitly raise a syntax error.  */
+  symbol **errors = xnmalloc (ntokens + 1, sizeof *errors);

 
 

-  conflicts = XCALLOC (char, nstates);
-  shiftset = XCALLOC (unsigned, tokensetsize);
-  lookaheadset = XCALLOC (unsigned, tokensetsize);
+  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++)
 
   for (i = 0; i < nstates; i++)

-    set_conflicts (state_table[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];

 }
 
 
 }
 
 


@@ -212,104 +424,77 @@ solve_conflicts (void)
 `---------------------------------------------*/
 
 static int
 `---------------------------------------------*/
 
 static int

-count_sr_conflicts (state_t *state)
+count_sr_conflicts (state *s)

 {
 {

-  int i, k;
+  int i;

   int src_count = 0;
   int src_count = 0;

-  shifts *shiftp = state->shifts;
+  transitions *trans = s->transitions;
+  reductions *reds = s->reductions;

 
 

-  if (!shiftp)
+  if (!trans)

     return 0;
 
     return 0;
 

-  for (i = 0; i < tokensetsize; i++)
-    {
-      shiftset[i] = 0;
-      lookaheadset[i] = 0;
-    }
+  bitset_zero (lookahead_set);
+  bitset_zero (shift_set);

 
 

-  for (i = 0; i < shiftp->nshifts && SHIFT_IS_SHIFT (shiftp, i); i++)
-    if (!SHIFT_IS_DISABLED (shiftp, i))
-      SETBIT (shiftset, SHIFT_SYMBOL (shiftp, i));
+  FOR_EACH_SHIFT (trans, i)
+    bitset_set (shift_set, TRANSITION_SYMBOL (trans, i));

 
 

-  for (i = 0; i < state->nlookaheads; ++i)
-    for (k = 0; k < tokensetsize; ++k)
-      lookaheadset[k] |= LA (state->lookaheadsp + i)[k];
+  for (i = 0; i < reds->num; ++i)
+    bitset_or (lookahead_set, lookahead_set, reds->lookahead_tokens[i]);

 
 

-  for (k = 0; k < tokensetsize; ++k)
-    lookaheadset[k] &= shiftset[k];
+  bitset_and (lookahead_set, lookahead_set, shift_set);

 
 

-  for (i = 0; i < ntokens; i++)
-    if (BITISSET (lookaheadset, i))
-      src_count++;
+  src_count = bitset_count (lookahead_set);

 
   return src_count;
 }
 
 
 
   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
 
 static int

-count_rr_conflicts (state_t *state)
+count_rr_conflicts (state *s, bool one_per_token)

 {
   int i;
 {
   int i;

+  reductions *reds = s->reductions;

   int rrc_count = 0;
 
   int rrc_count = 0;
 

-  if (state->nlookaheads < 2)
-    return 0;
-

   for (i = 0; i < ntokens; i++)
     {
       int count = 0;
       int j;
   for (i = 0; i < ntokens; i++)
     {
       int count = 0;
       int j;

-      for (j = 0; j < state->nlookaheads; ++j)
-       if (BITISSET (LA (state->lookaheadsp), state->lookaheadsp + j))
+      for (j = 0; j < reds->num; ++j)
+       if (bitset_test (reds->lookahead_tokens[j], i))

          count++;
 
       if (count >= 2)
          count++;
 
       if (count >= 2)

-       rrc_count++;
+       rrc_count += one_per_token ? 1 : count-1;

     }
 
   return rrc_count;
 }
 
     }
 
   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;
+/*--------------------------------------------------------.
+| Report the number of conflicts, using the Yacc format.  |
+`--------------------------------------------------------*/

 
 

-  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';
-
-  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);

 }
 
 
 }
 
 


@@ -320,18 +505,45 @@ conflict_report (int src_num, int rrc_num)
 void
 conflicts_output (FILE *out)
 {
 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])
       {
   for (i = 0; i < nstates; i++)
     if (conflicts[i])
       {

-       fprintf (out, _("State %d contains "), i);
-       fputs (conflict_report (count_sr_conflicts (state_table[i]),
-                               count_rr_conflicts (state_table[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;

 }
 
 
 }
 
 


@@ -342,66 +554,84 @@ conflicts_output (FILE *out)
 void
 conflicts_print (void)
 {
 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.  */
   /* 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_total = 0;
   int rrc_total = 0;

+  int src_expected;
+  int rrc_expected;

 
   /* Conflicts by state.  */
 
   /* Conflicts by state.  */

-  for (i = 0; i < nstates; i++)
-    if (conflicts[i])
-      {
-       src_total += count_sr_conflicts (state_table[i]);
-       rrc_total += count_rr_conflicts (state_table[i]);
-      }
+  {
+    state_number i;
+
+    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 (! glr_parser && rrc_total > 0 && expected_rr_conflicts != -1)
+    {
+      warn (_("%%expect-rr applies only to GLR parsers"));
+      expected_rr_conflicts = -1;
+    }

 
 

-  src_ok = src_total == (expected_conflicts == -1 ? 0 : expected_conflicts);
+  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;

 
 

-  /* If there are no RR conflicts, and as many SR conflicts as
+  /* If there are as many RR conflicts and SR conflicts as

      expected, then there is nothing to report.  */
      expected, then there is nothing to report.  */

-  if (!rrc_total && src_ok)
+  if (rrc_ok & src_ok)

     return;
 
   /* Report the total number of conflicts on STDERR.  */
     return;
 
   /* Report the total number of conflicts on STDERR.  */

-  if (yacc_flag)
+  if (expected_sr_conflicts == -1 && expected_rr_conflicts == -1)

     {
     {

-      /* 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);
+      if (!(warnings_flag & warnings_conflicts_sr))
+        src_total = 0;
+      if (!(warnings_flag & warnings_conflicts_rr))
+        rrc_total = 0;

     }
     }

-  else
+  if (src_total | rrc_total)

     {
     {

-      fprintf (stderr, _("%s contains "), infile);
-      fputs (conflict_report (src_total, rrc_total), stderr);
+      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);

     }
 
     }
 

-  if (expected_conflicts != -1 && !src_ok)
+  if (expected_sr_conflicts != -1 || 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);
+      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
     }
 }
 
 
 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);

 }
 }