* src/print.c, src/print_graph.c (escape): New.

[bison.git] / src / conflicts.c

diff --git a/src/conflicts.c b/src/conflicts.c
index cb0e67db246793d5318d20d1834fc101d66a1fd9..2f9b4c247892bff531b47a9e4f7adab1487774da 100644 (file)
--- a/src/conflicts.c
+++ b/src/conflicts.c
@@ -1,747 +1,406 @@
 /* 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 Free Software Foundation, Inc.
+   Copyright 1984, 1989, 1992, 2000, 2001 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.
+   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.

 
 

-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.
+   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.

 
 

-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, 675 Mass Ave, Cambridge, MA 02139, USA.  */
+   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.  */

 
 

-#include <stdio.h>

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

-#include "machine.h"
-#include "alloc.h"
+#include "complain.h"
+#include "getargs.h"

 #include "files.h"
 #include "gram.h"
 #include "state.h"
 #include "files.h"
 #include "gram.h"
 #include "state.h"

+#include "lalr.h"
+#include "conflicts.h"
+#include "reader.h"
+#include "LR0.h"

 
 

+/* -1 stands for not specified. */
+int expected_conflicts = -1;
+static char *conflicts = NULL;

 
 

-extern char **tags;
-extern int tokensetsize;
-extern char *consistent;
-extern short *accessing_symbol;
-extern shifts **shift_table;
-extern unsigned *LA;
-extern short *LAruleno;
-extern short *lookaheads;
-extern int verboseflag;
-extern int fixed_outfiles;
-
-void initialize_conflicts PARAMS((void));
-void set_conflicts PARAMS((int));
-void resolve_sr_conflict PARAMS((int, int));
-void flush_shift PARAMS((int, int));
-void log_resolution PARAMS((int, int, int, char *));
-void conflict_log PARAMS((void));
-void verbose_conflict_log PARAMS((void));
-void total_conflicts PARAMS((void));
-void count_sr_conflicts PARAMS((int));
-void count_rr_conflicts PARAMS((int));
-void print_reductions PARAMS((int));
-void finalize_conflicts PARAMS((void));
-
-char any_conflicts;
-char *conflicts;
-errs **err_table;
-int expected_conflicts;
-
-
-static unsigned *shiftset;
-static unsigned *lookaheadset;
-static int src_total;
-static int rrc_total;
-static int src_count;
-static int rrc_count;
+static unsigned *shiftset = NULL;
+static unsigned *lookaheadset = NULL;
+\f

 
 

-
-void
-initialize_conflicts (void)
+static inline void
+log_resolution (state_t *state, int LAno, int token, char *resolution)

 {
 {

-  register int i;
-/*  register errs *sp; JF unused */
+  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);
+}

 
 

-  conflicts = NEW2(nstates, char);
-  shiftset = NEW2(tokensetsize, unsigned);
-  lookaheadset = NEW2(tokensetsize, unsigned);

 
 

-  err_table = NEW2(nstates, errs *);
+/*------------------------------------------------------------------.
+| 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.                                           |
+`------------------------------------------------------------------*/

 
 

-  any_conflicts = 0;
+static void
+flush_shift (state_t *state, int token)
+{
+  shifts *shiftp = state->shifts;
+  int i;

 
 

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

 }
 
 
 }
 
 

-void
-set_conflicts (int state)
-{
-  register int i;
-  register int k;
-  register shifts *shiftp;
-  register unsigned *fp2;
-  register unsigned *fp3;
-  register unsigned *fp4;
-  register unsigned *fp1;
-  register int symbol;
-
-  if (consistent[state]) return;
+/*-------------------------------------------------------------------.
+| 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.                                             |
+`-------------------------------------------------------------------*/

 
 

-  for (i = 0; i < tokensetsize; i++)
-    lookaheadset[i] = 0;
+static void
+flush_reduce (int lookahead, int token)
+{
+  RESETBIT (LA (lookahead), token);
+}

 
 

-  shiftp = shift_table[state];
-  if (shiftp)
-    {
-      k = shiftp->nshifts;
-      for (i = 0; i < k; i++)
-       {
-         symbol = accessing_symbol[shiftp->shifts[i]];
-         if (ISVAR(symbol)) break;
-         SETBIT(lookaheadset, symbol);
-       }
-    }

 
 

-  k = lookaheads[state + 1];
-  fp4 = lookaheadset + tokensetsize;
+/*------------------------------------------------------------------.
+| Attempt to resolve shift-reduce conflict for one rule by means of |
+| 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.     |
+`------------------------------------------------------------------*/

 
 

-  /* loop over all rules which require lookahead in this state */
-  /* first check for shift-reduce conflict, and try to resolve using precedence  */
+static void
+resolve_sr_conflict (state_t *state, int lookahead)
+{
+  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;

 
 

-  for (i = lookaheads[state]; i < k; i++)
-    if (rprec[LAruleno[i]])
+  for (i = 0; i < ntokens; i++)
+    if (BITISSET (LA (lookahead), i)
+       && BITISSET (lookaheadset, i)
+       && sprec[i])

       {
       {

-       fp1 = LA + i * tokensetsize;
-       fp2 = fp1;
-       fp3 = lookaheadset;
-  
-       while (fp3 < fp4)
+       /* 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)

          {
          {

-           if (*fp2++ & *fp3++)
-             {
-               resolve_sr_conflict(state, i);
-               break;
-             }
+           log_resolution (state, lookahead, i, _("reduce"));
+           flush_shift (state, i);

          }
          }

-      }
-
-  /* loop over all rules which require lookahead in this state */
-  /* Check for conflicts not resolved above.  */
-
-  for (i = lookaheads[state]; i < k; i++)
-    {
-      fp1 = LA + i * tokensetsize;
-      fp2 = fp1;
-      fp3 = lookaheadset;
+       else if (sprec[i] > redprec)
+         {
+           log_resolution (state, lookahead, i, _("shift"));
+           flush_reduce (lookahead, i);
+         }
+       else
+         /* Matching precedence levels.
+            For left association, keep only the reduction.
+            For right association, keep only the shift.
+            For nonassociation, keep neither.  */

 
 

-      while (fp3 < fp4)
-       {
-         if (*fp2++ & *fp3++)
+         switch (sassoc[i])

            {
            {

-             conflicts[state] = 1;
-             any_conflicts = 1;
+           case right_assoc:
+             log_resolution (state, lookahead, i, _("shift"));
+             flush_reduce (lookahead, i);
+             break;
+
+           case left_assoc:
+             log_resolution (state, lookahead, i, _("reduce"));
+             flush_shift (state, i);
+             break;
+
+           case non_assoc:
+             log_resolution (state, lookahead, i, _("an error"));
+             flush_shift (state, i);
+             flush_reduce (lookahead, i);
+             /* Record an explicit error for this token.  */
+             errp->errs[errp->nerrs++] = i;
+             break;

            }
            }

-       }
-
-      fp2 = fp1;
-      fp3 = lookaheadset;
+      }

 
 

-      while (fp3 < fp4)
-       *fp3++ |= *fp2++;
-    }
+  /* 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);

 }
 
 
 }
 
 

+static void
+set_conflicts (state_t *state)
+{
+  int i, j;
+  shifts *shiftp;

 
 

-/* Attempt to resolve shift-reduce conflict for one rule
-by means of 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.  */
+  if (state->consistent)
+    return;

 
 

-void
-resolve_sr_conflict (int state, int lookaheadnum)
-{
-  register int i;
-  register int mask;
-  register unsigned *fp1;
-  register unsigned *fp2;
-  register int redprec;
-  errs *errp = (errs *) xmalloc (sizeof(errs) + ntokens * sizeof(short));
-  short *errtokens = errp->errs;
+  for (i = 0; i < tokensetsize; i++)
+    lookaheadset[i] = 0;

 
 

-  /* find the rule to reduce by to get precedence of reduction  */
-  redprec = rprec[LAruleno[lookaheadnum]];
+  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));
+
+  /* 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;
+         }

 
 

-  mask = 1;
-  fp1 = LA + lookaheadnum * tokensetsize;
-  fp2 = lookaheadset;
-  for (i = 0; i < ntokens; i++)
-    {
-      if ((mask & *fp2 & *fp1) && sprec[i])
-       /* 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)
-           {
-             if (verboseflag) log_resolution(state, lookaheadnum, i, _("reduce"));
-             *fp2 &= ~mask;  /* flush the shift for this token */
-             flush_shift(state, i);
-           }
-         else if (sprec[i] > redprec)
-           {
-             if (verboseflag) log_resolution(state, lookaheadnum, i, _("shift"));
-             *fp1 &= ~mask;  /* flush the reduce for this token */
-           }
-         else
-           {
-             /* 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:
-                 if (verboseflag) log_resolution(state, lookaheadnum, i, _("shift"));
-                 break;
-
-               case LEFT_ASSOC:
-                 if (verboseflag) log_resolution(state, lookaheadnum, i, _("reduce"));
-                 break;
-
-               case NON_ASSOC:
-                 if (verboseflag) 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;
-               }
-           }
-       }
-
-      mask <<= 1;
-      if (mask == 0)
-       {
-         mask = 1;
-         fp2++;  fp1++;
-       }
-    }
-  errp->nerrs = errtokens - errp->errs;
-  if (errp->nerrs)
+
+  /* Loop over all rules which require lookahead in this state.  Check
+     for conflicts not resolved above.  */
+  for (i = 0; i < state->nlookaheads; ++i)

     {
     {

-      /* 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 *) xmalloc ((unsigned int)i);
-      bcopy (errp, err_table[state], 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];

     }
     }

-  else
-    err_table[state] = 0;
-  free(errp);

 }
 
 }
 

-
-
-/* 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.  */
-

 void
 void

-flush_shift (int state, int token)
+solve_conflicts (void)

 {
 {

-  register shifts *shiftp;
-  register int k, i;
-/*  register unsigned symbol; JF unused */
+  int i;

 
 

-  shiftp = shift_table[state];
+  conflicts = XCALLOC (char, nstates);
+  shiftset = XCALLOC (unsigned, tokensetsize);
+  lookaheadset = XCALLOC (unsigned, tokensetsize);

 
 

-  if (shiftp)
-    {
-      k = shiftp->nshifts;
-      for (i = 0; i < k; i++)
-       {
-         if (shiftp->shifts[i] && token == accessing_symbol[shiftp->shifts[i]])
-           (shiftp->shifts[i]) = 0;
-       }
-    }
+  for (i = 0; i < nstates; i++)
+    set_conflicts (state_table[i]);

 }
 
 
 }
 
 

-void
-log_resolution (int state, int LAno, int token, char *resolution)
-{
-  fprintf(foutput,
-         _("Conflict in state %d between rule %d and token %s resolved as %s.\n"),
-         state, LAruleno[LAno], tags[token], resolution);
-}
-
+/*---------------------------------------------.
+| Count the number of shift/reduce conflicts.  |
+`---------------------------------------------*/

 
 

-void
-conflict_log (void)
+static int
+count_sr_conflicts (state_t *state)

 {
 {

-  register int i;
+  int i, k;
+  int src_count = 0;
+  shifts *shiftp = state->shifts;

 
 

-  src_total = 0;
-  rrc_total = 0;
+  if (!shiftp)
+    return 0;

 
 

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

     {
     {

-      if (conflicts[i])
-       {
-         count_sr_conflicts(i);
-         count_rr_conflicts(i);
-         src_total += src_count;
-         rrc_total += rrc_count;
-       }
+      shiftset[i] = 0;
+      lookaheadset[i] = 0;

     }
 
     }
 

-  total_conflicts();
-}
-  
+  for (i = 0; i < shiftp->nshifts && SHIFT_IS_SHIFT (shiftp, i); i++)
+    if (!SHIFT_IS_DISABLED (shiftp, i))
+      SETBIT (shiftset, SHIFT_SYMBOL (shiftp, i));

 
 

-void
-verbose_conflict_log (void)
-{
-  register int i;
+  for (i = 0; i < state->nlookaheads; ++i)
+    for (k = 0; k < tokensetsize; ++k)
+      lookaheadset[k] |= LA (state->lookaheadsp + i)[k];

 
 

-  src_total = 0;
-  rrc_total = 0;
+  for (k = 0; k < tokensetsize; ++k)
+    lookaheadset[k] &= shiftset[k];

 
 

-  for (i = 0; i < nstates; i++)
-    {
-      if (conflicts[i])
-       {
-         count_sr_conflicts(i);
-         count_rr_conflicts(i);
-         src_total += src_count;
-         rrc_total += rrc_count;
-
-         fprintf(foutput, _("State %d contains"), i);
-
-         if (src_count == 1)
-           fprintf(foutput, _(" 1 shift/reduce conflict"));
-         else if (src_count > 1)
-           fprintf(foutput, _(" %d shift/reduce conflicts"), src_count);
-
-         if (src_count > 0 && rrc_count > 0)
-           fprintf(foutput, _(" and"));
-
-         if (rrc_count == 1)
-           fprintf(foutput, _(" 1 reduce/reduce conflict"));
-         else if (rrc_count > 1)
-           fprintf(foutput, _(" %d reduce/reduce conflicts"), rrc_count);
-
-         putc('.', foutput);
-         putc('\n', foutput);
-       }
-    }
+  for (i = 0; i < ntokens; i++)
+    if (BITISSET (lookaheadset, i))
+      src_count++;

 
 

-  total_conflicts();
+  return src_count;

 }
 
 
 }
 
 

-void
-total_conflicts (void)
+/*----------------------------------------------.
+| Count the number of reduce/reduce conflicts.  |
+`----------------------------------------------*/
+
+static int
+count_rr_conflicts (state_t *state)

 {
 {

-  if (src_total == expected_conflicts && rrc_total == 0)
-    return;
+  int i;
+  int rrc_count = 0;
+
+  if (state->nlookaheads < 2)
+    return 0;

 
 

-  if (fixed_outfiles)
+  for (i = 0; i < ntokens; i++)

     {
     {

-      /* If invoked under the name `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);
+      int count = 0;
+      int j;
+      for (j = 0; j < state->nlookaheads; ++j)
+       if (BITISSET (LA (state->lookaheadsp), state->lookaheadsp + j))
+         count++;
+
+      if (count >= 2)
+       rrc_count++;

     }
     }

-  else
-    {
-      fprintf(stderr, _("%s contains"), infile);

 
 

-      if (src_total == 1)
-       fprintf(stderr, _(" 1 shift/reduce conflict"));
-      else if (src_total > 1)
-       fprintf(stderr, _(" %d shift/reduce conflicts"), src_total);
-
-      if (src_total > 0 && rrc_total > 0)
-       fprintf(stderr, _(" and"));
-
-      if (rrc_total == 1)
-       fprintf(stderr, _(" 1 reduce/reduce conflict"));
-      else if (rrc_total > 1)
-       fprintf(stderr, _(" %d reduce/reduce conflicts"), rrc_total);
-
-      putc('.', stderr);
-      putc('\n', stderr);
-    }
+  return rrc_count;

 }
 
 }
 

+/*--------------------------------------------------------------.
+| Return a human readable string which reports shift/reduce and |
+| reduce/reduce conflict numbers (SRC_NUM, RRC_NUM).            |
+`--------------------------------------------------------------*/

 
 

-void
-count_sr_conflicts (int state)
+static const char *
+conflict_report (int src_num, int rrc_num)

 {
 {

-  register int i;
-  register int k;
-  register int mask;
-  register shifts *shiftp;
-  register unsigned *fp1;
-  register unsigned *fp2;
-  register unsigned *fp3;
-  register int symbol;
-
-  src_count = 0;
+  static char res[4096];
+  char *cp = res;

 
 

-  shiftp = shift_table[state];
-  if (!shiftp) return;
-
-  for (i = 0; i < tokensetsize; i++)
+  if (src_num >= 1)

     {
     {

-      shiftset[i] = 0;
-      lookaheadset[i] = 0;
+      sprintf (cp, ngettext ("%d shift/reduce conflict",
+                            "%d shift/reduce conflicts", src_num), src_num);
+      cp += strlen (cp);

     }
 
     }
 

-  k = shiftp->nshifts;
-  for (i = 0; i < k; i++)
+  if (src_num > 0 && rrc_num > 0)

     {
     {

-      if (! shiftp->shifts[i]) continue;
-      symbol = accessing_symbol[shiftp->shifts[i]];
-      if (ISVAR(symbol)) break;
-      SETBIT(shiftset, symbol);
+      sprintf (cp, " %s ", _("and"));
+      cp += strlen (cp);

     }
 
     }
 

-  k = lookaheads[state + 1];
-  fp3 = lookaheadset + tokensetsize;
-
-  for (i = lookaheads[state]; i < k; i++)
+  if (rrc_num >= 1)

     {
     {

-      fp1 = LA + i * tokensetsize;
-      fp2 = lookaheadset;
-
-      while (fp2 < fp3)
-       *fp2++ |= *fp1++;
+      sprintf (cp, ngettext ("%d reduce/reduce conflict",
+                            "%d reduce/reduce conflicts", rrc_num), rrc_num);
+      cp += strlen (cp);

     }
 
     }
 

-  fp1 = shiftset;
-  fp2 = lookaheadset;
-
-  while (fp2 < fp3)
-    *fp2++ &= *fp1++;
+  *cp++ = '.';
+  *cp++ = '\n';
+  *cp++ = '\0';

 
 

-  mask = 1;
-  fp2 = lookaheadset;
-  for (i = 0; i < ntokens; i++)
-    {
-      if (mask & *fp2)
-       src_count++;
-
-      mask <<= 1;
-      if (mask == 0)
-       {
-         mask = 1;
-         fp2++;
-       }
-    }
+  return res;

 }
 
 
 }
 
 

+/*-----------------------------------------------------------.
+| Output the detailed description of states with conflicts.  |
+`-----------------------------------------------------------*/
+

 void
 void

-count_rr_conflicts (int state)
+conflicts_output (FILE *out)

 {
 {

-  register int i;
-  register int j;
-  register int count;
-  register unsigned mask;
-  register unsigned *baseword;
-  register unsigned *wordp;
-  register int m;
-  register int n;
-
-  rrc_count = 0;
-
-  m = lookaheads[state];
-  n = lookaheads[state + 1];
-
-  if (n - m < 2) return;
+  bool printed_sth = FALSE;
+  int 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;
+      }
+  if (printed_sth)
+    fputs ("\n\n", out);
+}

 
 

-  mask = 1;
-  baseword = LA + m * tokensetsize;
-  for (i = 0; i < ntokens; i++)
-    {
-      wordp = baseword;

 
 

-      count = 0;
-      for (j = m; j < n; j++)
-       {
-         if (mask & *wordp)
-           count++;
+/*------------------------------------------.
+| Reporting the total number of conflicts.  |
+`------------------------------------------*/

 
 

-         wordp += tokensetsize;
-       }
+void
+conflicts_print (void)
+{
+  int i;

 
 

-      if (count >= 2) rrc_count++;
+  /* 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;

 
 

-      mask <<= 1;
-      if (mask == 0)
-       {
-         mask = 1;
-         baseword++;
-       }
-    }
-}
+  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 (state_table[i]);
+       rrc_total += count_rr_conflicts (state_table[i]);
+      }

 
 

-void
-print_reductions (int state)
-{
-  register int i;
-  register int j;
-  register int k;
-  register unsigned *fp1;
-  register unsigned *fp2;
-  register unsigned *fp3;
-  register unsigned *fp4;
-  register int rule;
-  register int symbol;
-  register unsigned mask;
-  register int m;
-  register int n;
-  register int default_LA;
-  register int default_rule;
-  register int cmax;
-  register int count;
-  register shifts *shiftp;
-  register errs *errp;
-  int nodefault = 0;
+  src_ok = src_total == (expected_conflicts == -1 ? 0 : expected_conflicts);

 
 

-  for (i = 0; i < tokensetsize; i++)
-    shiftset[i] = 0;
+  /* 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;

 
 

-  shiftp = shift_table[state];
-  if (shiftp)
+  /* Report the total number of conflicts on STDERR.  */
+  if (yacc_flag)

     {
     {

-      k = shiftp->nshifts;
-      for (i = 0; i < k; i++)
-       {
-         if (! shiftp->shifts[i]) continue;
-         symbol = accessing_symbol[shiftp->shifts[i]];
-         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 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);

     }
     }

-
-  errp = err_table[state];
-  if (errp)
+  else

     {
     {

-      k = errp->nerrs;
-      for (i = 0; i < k; i++)
-       {
-         if (! errp->errs[i]) continue;
-         symbol = errp->errs[i];
-         SETBIT(shiftset, symbol);
-       }
+      fprintf (stderr, _("%s contains "), infile);
+      fputs (conflict_report (src_total, rrc_total), stderr);

     }
 
     }
 

-  m = lookaheads[state];
-  n = lookaheads[state + 1];
-
-  if (n - m == 1 && ! nodefault)
-    {
-      default_rule = LAruleno[m];
-
-      fp1 = LA + m * tokensetsize;
-      fp2 = shiftset;
-      fp3 = lookaheadset;
-      fp4 = lookaheadset + tokensetsize;
-
-      while (fp3 < fp4)
-       *fp3++ = *fp1++ & *fp2++;
-
-      mask = 1;
-      fp3 = lookaheadset;
-
-      for (i = 0; i < ntokens; i++)
-       {
-         if (mask & *fp3)
-           fprintf(foutput, _("    %-4s\t[reduce using rule %d (%s)]\n"),
-                   tags[i], default_rule, tags[rlhs[default_rule]]);
-
-         mask <<= 1;
-         if (mask == 0)
-           {
-             mask = 1;
-             fp3++;
-           }
-       }
-
-      fprintf(foutput, _("    $default\treduce using rule %d (%s)\n\n"),
-             default_rule, tags[rlhs[default_rule]]);
-    }
-  else if (n - m >= 1)
+  if (expected_conflicts != -1 && !src_ok)

     {
     {

-      cmax = 0;
-      default_LA = -1;
-      fp4 = lookaheadset + tokensetsize;
-
-      if (! nodefault)
-       for (i = m; i < n; i++)
-         {
-           fp1 = LA + i * tokensetsize;
-           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)
-        {
-          k = shiftp->nshifts;
-          for (i = 0; i < k; i++)
-           {
-             if (! shiftp->shifts[i]) continue;
-             symbol = accessing_symbol[shiftp->shifts[i]];
-             if (ISVAR(symbol)) break;
-             SETBIT(shiftset, symbol);
-           }
-        }
-
-      mask = 1;
-      fp1 = LA + m * tokensetsize;
-      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)
-                       {
-                         rule = LAruleno[j];
-                         fprintf(foutput, _("    %-4s\treduce using rule %d (%s)\n"),
-                                 tags[i], rule, tags[rlhs[rule]]);
-                       }
-                     else defaulted = 1;
-
-                     count++;
-                   }
-                 else
-                   {
-                     if (defaulted)
-                       {
-                         rule = LAruleno[default_LA];
-                         fprintf(foutput, _("    %-4s\treduce using rule %d (%s)\n"),
-                                 tags[i], rule, tags[rlhs[rule]]);
-                         defaulted = 0;
-                       }
-                     rule = LAruleno[j];
-                     fprintf(foutput, _("    %-4s\t[reduce using rule %d (%s)]\n"),
-                             tags[i], rule, tags[rlhs[rule]]);
-                   }
-               }
-
-             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(foutput, _("    $default\treduce using rule %d (%s)\n"),
-                 default_rule, tags[rlhs[default_rule]]);
-       }
-
-      putc('\n', foutput);
+      complain_message_count++;
+      fprintf (stderr, ngettext ("expected %d shift/reduce conflict\n",
+                                "expected %d shift/reduce conflicts\n",
+                                expected_conflicts),
+              expected_conflicts);

     }
 }
 
 
 void
     }
 }
 
 
 void

-finalize_conflicts (void)
+free_conflicts (void)

 {
 {

-  FREE(conflicts);
-  FREE(shiftset);
-  FREE(lookaheadset);
+  XFREE (conflicts);
+  XFREE (shiftset);
+  XFREE (lookaheadset);

 }
 }