* data/glr.c (YYCHK1): Do not assume YYE is in range.

[bison.git] / src / conflicts.c

diff --git a/src/conflicts.c b/src/conflicts.c
index df3c931ddc2b1900670324dff0c03e42f4a222c7..ede39690c3aaeb7fcc9604965f2b6060dc873bbb 100644 (file)
--- a/src/conflicts.c
+++ b/src/conflicts.c
@@ -1,5 +1,6 @@
 /* Find and resolve or report look-ahead conflicts for bison,
 /* Find and resolve or report look-ahead conflicts for bison,

-   Copyright (C) 1984, 1989, 1992, 2000, 2001, 2002
+
+   Copyright (C) 1984, 1989, 1992, 2000, 2001, 2002, 2003, 2004

    Free Software Foundation, Inc.
 
    This file is part of Bison, the GNU Compiler Compiler.
    Free Software Foundation, Inc.
 
    This file is part of Bison, the GNU Compiler Compiler.


@@ -16,41 +17,120 @@
 
    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
 
    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.  */
+   Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+   02110-1301, USA.  */

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

-#include "bitset.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 "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;
+struct obstack solved_conflicts_obstack;
+
+static bitset shift_set;
+static bitset look_ahead_set;

 
 

-static bitset shiftset;
-static bitset lookaheadset;

 \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, const char *resolution)
+log_resolution (rule *r, symbol_number token,
+               enum conflict_resolution resolution)

 {
 {

-  if (report_flag & report_states)
-    obstack_fgrow4 (&output_obstack,
-                   _("\
-Conflict in state %d between rule %d and token %s resolved as %s.\n"),
-                   state->number,
-                   LArule[LAno]->number,
-                   symbols[token]->tag,
-                   resolution);
+  if (report_flag & report_solved_conflicts)
+    {
+      /* The description of the resolution. */
+      switch (resolution)
+       {
+       case shift_resolution:
+       case right_resolution:
+         obstack_fgrow2 (&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_fgrow2 (&solved_conflicts_obstack,
+                         _("\
+    Conflict between rule %d and token %s resolved as reduce"),
+                         r->number,
+                         symbols[token]->tag);
+         break;
+       case nonassoc_resolution:
+         obstack_fgrow2 (&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_fgrow2 (&solved_conflicts_obstack,
+                         " (%s < %s)",
+                         r->prec->tag,
+                         symbols[token]->tag);
+         break;
+
+       case reduce_resolution:
+         obstack_fgrow2 (&solved_conflicts_obstack,
+                         " (%s < %s)",
+                         symbols[token]->tag,
+                         r->prec->tag);
+         break;
+
+       case left_resolution:
+         obstack_fgrow1 (&solved_conflicts_obstack,
+                         " (%%left %s)",
+                         symbols[token]->tag);
+         break;
+
+       case right_resolution:
+         obstack_fgrow1 (&solved_conflicts_obstack,
+                         " (%%right %s)",
+                         symbols[token]->tag);
+         break;
+       case nonassoc_resolution:
+         obstack_fgrow1 (&solved_conflicts_obstack,
+                         " (%%nonassoc %s)",
+                         symbols[token]->tag);
+         break;
+       }
+      obstack_sgrow (&solved_conflicts_obstack, ".\n");
+    }

 }
 
 
 }
 
 


@@ -61,28 +141,29 @@ Conflict in state %d between rule %d and token %s resolved as %s.\n"),
 `------------------------------------------------------------------*/
 
 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;
 

-  bitset_reset (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 (look_ahead_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 for the        |
+| specified look-ahead.  Used when we resolve a shift-reduce conflict |
+| in favor of the shift.                                              |
+`--------------------------------------------------------------------*/

 
 static void
 
 static void

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

 {
 {

-  bitset_reset (LA[lookahead], token);
+  bitset_reset (look_ahead_tokens, token);

 }
 
 
 }
 
 


@@ -91,20 +172,26 @@ 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 look-ahead bitset to consider.      |
+|                                                                   |
+| ERRORS 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 i;
-  /* find the rule to reduce by to get precedence of reduction  */
-  int redprec = LArule[lookahead]->prec->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 look_ahead_tokens = reds->look_ahead_tokens[ruleno];
+  int nerrs = 0;

 
   for (i = 0; i < ntokens; i++)
 
   for (i = 0; i < ntokens; i++)

-    if (bitset_test (LA[lookahead], i)
-       && bitset_test (lookaheadset, i)
+    if (bitset_test (look_ahead_tokens, i)
+       && bitset_test (look_ahead_set, i)

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


@@ -112,13 +199,13 @@ 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 (look_ahead_tokens, i);

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


@@ -129,82 +216,113 @@ resolve_sr_conflict (state_t *state, int lookahead)
          switch (symbols[i]->assoc)
            {
            case right_assoc:
          switch (symbols[i]->assoc)
            {
            case right_assoc:

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

+
+           case undef_assoc:
+             abort ();

            }
       }
 
            }
       }
 

-  /* 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);
+  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);
+    }

 }
 
 
 }
 
 

+/*-------------------------------------------------------------------.
+| 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   |
+| look-ahead 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;
 {
   int i;

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

 
 

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

     return;
 
     return;
 

-  bitset_zero (lookaheadset);
+  bitset_zero (look_ahead_set);

 
 

-  shiftp = state->shifts;
-  for (i = 0; i < shiftp->nshifts && SHIFT_IS_SHIFT (shiftp, i); i++)
-    if (!SHIFT_IS_DISABLED (shiftp, i))
-      bitset_set (lookaheadset, SHIFT_SYMBOL (shiftp, i));
+  FOR_EACH_SHIFT (trans, i)
+    bitset_set (look_ahead_set, TRANSITION_SYMBOL (trans, i));

 
 

-  /* Loop over all rules which require lookahead in this state.  First
+  /* Loop over all rules which require look-ahead in this state.  First

      check for shift-reduce conflict, and try to resolve using
      check for shift-reduce conflict, and try to resolve using

-     precedence */
-  for (i = 0; i < state->nlookaheads; ++i)
-    if (LArule[state->lookaheadsp + i]->prec
-       && LArule[state->lookaheadsp + i]->prec->prec
-       && !bitset_disjoint_p (LA[state->lookaheadsp + i], lookaheadset))
-      {
-       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->look_ahead_tokens[i], look_ahead_set))
+      resolve_sr_conflict (s, i, errors);

 
 

-  /* Loop over all rules which require lookahead in this state.  Check
+  /* Loop over all rules which require look-ahead in this state.  Check

      for conflicts not resolved above.  */
      for conflicts not resolved above.  */

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

     {
     {

-      if (!bitset_disjoint_p (LA[state->lookaheadsp + i], lookaheadset))
-       conflicts[state->number] = 1;
+      if (!bitset_disjoint_p (reds->look_ahead_tokens[i], look_ahead_set))
+       conflicts[s->number] = 1;

 
 

-      bitset_or (lookaheadset, lookaheadset, LA[state->lookaheadsp + i]);
+      bitset_or (look_ahead_set, look_ahead_set, reds->look_ahead_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)

 {
 {

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

 
 

-  conflicts = XCALLOC (char, nstates);
-  shiftset = bitset_create (ntokens, BITSET_FIXED);
-  lookaheadset = bitset_create (ntokens, BITSET_FIXED);
+  conflicts = xcalloc (nstates, sizeof *conflicts);
+  shift_set = bitset_create (ntokens, BITSET_FIXED);
+  look_ahead_set = bitset_create (ntokens, BITSET_FIXED);
+  obstack_init (&solved_conflicts_obstack);

 
   for (i = 0; i < nstates; i++)
 
   for (i = 0; i < nstates; i++)

-    set_conflicts (states[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);

 }
 
 
 }
 
 


@@ -213,97 +331,77 @@ solve_conflicts (void)
 `---------------------------------------------*/
 
 static int
 `---------------------------------------------*/
 
 static int

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

 {
   int i;
   int src_count = 0;
 {
   int i;
   int src_count = 0;

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

 
 

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

     return 0;
 
     return 0;
 

-  bitset_zero (lookaheadset);
-  bitset_zero (shiftset);
+  bitset_zero (look_ahead_set);
+  bitset_zero (shift_set);

 
 

-  for (i = 0; i < shiftp->nshifts && SHIFT_IS_SHIFT (shiftp, i); i++)
-    if (!SHIFT_IS_DISABLED (shiftp, i))
-      bitset_set (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)
-    bitset_or (lookaheadset, lookaheadset, LA[state->lookaheadsp + i]);
+  for (i = 0; i < reds->num; ++i)
+    bitset_or (look_ahead_set, look_ahead_set, reds->look_ahead_tokens[i]);

 
 

-  bitset_and (lookaheadset, lookaheadset, shiftset);
+  bitset_and (look_ahead_set, look_ahead_set, shift_set);

 
 

-  src_count = bitset_count (lookaheadset);
+  src_count = bitset_count (look_ahead_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 (bitset_test (LA[state->lookaheadsp + j], i))
+      for (j = 0; j < reds->num; ++j)
+       if (bitset_test (reds->look_ahead_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;
-
-  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);

 }
 
 
 }
 
 


@@ -314,18 +412,45 @@ conflict_report (int src_num, int rrc_num)
 void
 conflicts_output (FILE *out)
 {
 void
 conflicts_output (FILE *out)
 {

-  bool printed_sth = FALSE;
-  size_t 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 look-ahead 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 (states[i]),
-                               count_rr_conflicts (states[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;

 }
 
 
 }
 
 


@@ -336,66 +461,69 @@ conflicts_output (FILE *out)
 void
 conflicts_print (void)
 {
 void
 conflicts_print (void)
 {

-  size_t 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 = false;
+  bool rrc_ok = false;

 
   int src_total = 0;
   int rrc_total = 0;
 
   /* Conflicts by state.  */
 
   int src_total = 0;
   int rrc_total = 0;
 
   /* Conflicts by state.  */

-  for (i = 0; i < nstates; i++)
-    if (conflicts[i])
-      {
-       src_total += count_sr_conflicts (states[i]);
-       rrc_total += count_rr_conflicts (states[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_ok =
+    src_total == (expected_sr_conflicts == -1 ? 0 : expected_sr_conflicts);
+  rrc_ok =
+    rrc_total == (expected_rr_conflicts == -1 ? 0 : expected_rr_conflicts);

 
 

-  /* 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 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);
-    }
+  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);
+      int sr = expected_sr_conflicts == -1 ? 0 : expected_sr_conflicts;
+      int rr = expected_rr_conflicts == -1 ? 0 : expected_rr_conflicts;
+      if (! src_ok)
+       warn (ngettext ("expected %d shift/reduce conflict",
+                       "expected %d shift/reduce conflicts",
+                       sr), sr);
+      if (! rrc_ok)
+       warn (ngettext ("expected %d reduce/reduce conflict",
+                       "expected %d reduce/reduce conflicts",
+                       rr), rr);

     }
 }
 
 
 void
     }
 }
 
 
 void

-free_conflicts (void)
+conflicts_free (void)

 {
 {

-  XFREE (conflicts);
-  bitset_free (shiftset);
-  bitset_free (lookaheadset);
+  free (conflicts);
+  bitset_free (shift_set);
+  bitset_free (look_ahead_set);
+  obstack_free (&solved_conflicts_obstack, NULL);

 }
 }