X-Git-Url: https://git.saurik.com/bison.git/blobdiff_plain/ff4423cc2856ccc63b0fc72430fdc095208e0b14..eeeb962b:/src/conflicts.c

diff --git a/src/conflicts.c b/src/conflicts.c
index 50e82c9f..b6bacb94 100644
--- a/src/conflicts.c
+++ b/src/conflicts.c
@@ -1,5 +1,5 @@
 /* Find and resolve or report look-ahead conflicts for bison,
-   Copyright 1984, 1989, 1992, 2000 Free Software Foundation, Inc.
+   Copyright 1984, 1989, 1992, 2000, 2001 Free Software Foundation, Inc.
 
    This file is part of Bison, the GNU Compiler Compiler.
 
@@ -19,8 +19,8 @@
    02111-1307, USA.  */
 
 #include "system.h"
+#include "complain.h"
 #include "getargs.h"
-#include "xalloc.h"
 #include "files.h"
 #include "gram.h"
 #include "state.h"
@@ -29,17 +29,13 @@
 #include "reader.h"
 #include "LR0.h"
 
-int any_conflicts = 0;
-errs **err_table;
-int expected_conflicts;
-static char *conflicts;
-
-static unsigned *shiftset;
-static unsigned *lookaheadset;
-static int src_total;
-static int rrc_total;
-static int src_count;
-static int rrc_count;
+errs **err_table = NULL;
+/* -1 stands for not specified. */
+int expected_conflicts = -1;
+static char *conflicts = NULL;
+
+static unsigned *shiftset = NULL;
+static unsigned *lookaheadset = NULL;
 
 
 static inline void
@@ -64,7 +60,7 @@ flush_shift (int state, int token)
   shifts *shiftp;
   int k, i;
 
-  shiftp = shift_table[state];
+  shiftp = state_table[state].shift_table;
 
   if (shiftp)
     {
@@ -72,7 +68,7 @@ flush_shift (int state, int token)
       for (i = 0; i < k; i++)
 	{
 	  if (shiftp->shifts[i]
-	      && token == accessing_symbol[shiftp->shifts[i]])
+	      && token == state_table[shiftp->shifts[i]].accessing_symbol)
 	    (shiftp->shifts[i]) = 0;
 	}
     }
@@ -94,14 +90,14 @@ resolve_sr_conflict (int state, int lookaheadnum)
   unsigned *fp1;
   unsigned *fp2;
   int redprec;
-  errs *errp = (errs *) xcalloc (sizeof (errs) + ntokens * sizeof (short), 1);
+  errs *errp = ERRS_ALLOC (ntokens + 1);
   short *errtokens = errp->errs;
 
   /* find the rule to reduce by to get precedence of reduction  */
-  redprec = rprec[LAruleno[lookaheadnum]];
+  redprec = rule_table[LAruleno[lookaheadnum]].prec;
 
   mask = 1;
-  fp1 = LA + lookaheadnum * tokensetsize;
+  fp1 = LA (lookaheadnum);
   fp2 = lookaheadset;
   for (i = 0; i < ntokens; i++)
     {
@@ -174,7 +170,7 @@ resolve_sr_conflict (int state, int lookaheadnum)
       /* 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 *) xcalloc ((unsigned int) i, 1);
+      err_table[state] = ERRS_ALLOC (i + 1);
       bcopy (errp, err_table[state], i);
     }
   else
@@ -186,85 +182,58 @@ resolve_sr_conflict (int state, int lookaheadnum)
 static void
 set_conflicts (int state)
 {
-  int i;
-  int k;
+  int i, j;
   shifts *shiftp;
-  unsigned *fp2;
-  unsigned *fp3;
-  unsigned *fp4;
-  unsigned *fp1;
   int symbol;
 
-  if (consistent[state])
+  if (state_table[state].consistent)
     return;
 
   for (i = 0; i < tokensetsize; i++)
     lookaheadset[i] = 0;
 
-  shiftp = shift_table[state];
+  shiftp = state_table[state].shift_table;
   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;
+    for (i = 0; i < shiftp->nshifts; i++)
+      {
+	symbol = state_table[shiftp->shifts[i]].accessing_symbol;
+	if (ISVAR (symbol))
+	  break;
+	SETBIT (lookaheadset, symbol);
+      }
 
   /* Loop over all rules which require lookahead in this state.  First
      check for shift-reduce conflict, and try to resolve using
      precedence */
-  for (i = lookaheads[state]; i < k; i++)
-    if (rprec[LAruleno[i]])
-      {
-	fp1 = LA + i * tokensetsize;
-	fp2 = fp1;
-	fp3 = lookaheadset;
-
-	while (fp3 < fp4)
+  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])
 	  {
-	    if (*fp2++ & *fp3++)
-	      {
-		resolve_sr_conflict (state, i);
-		break;
-	      }
+	    resolve_sr_conflict (state, i);
+	    break;
 	  }
-      }
 
 
   /* Loop over all rules which require lookahead in this state.  Check
      for conflicts not resolved above.  */
-  for (i = lookaheads[state]; i < k; i++)
+  for (i = state_table[state].lookaheads;
+       i < state_table[state + 1].lookaheads;
+       ++i)
     {
-      fp1 = LA + i * tokensetsize;
-      fp2 = fp1;
-      fp3 = lookaheadset;
-
-      while (fp3 < fp4)
-	{
-	  if (*fp2++ & *fp3++)
-	    {
-	      conflicts[state] = 1;
-	      any_conflicts = 1;
-	    }
-	}
+      for (j = 0; j < tokensetsize; ++j)
+	if (LA (i)[j] & lookaheadset[j])
+	  conflicts[state] = 1;
 
-      fp2 = fp1;
-      fp3 = lookaheadset;
-
-      while (fp3 < fp4)
-	*fp3++ |= *fp2++;
+      for (j = 0; j < tokensetsize; ++j)
+	lookaheadset[j] |= LA (i)[j];
     }
 }
 
 void
-initialize_conflicts (void)
+solve_conflicts (void)
 {
   int i;
 
@@ -274,8 +243,6 @@ initialize_conflicts (void)
 
   err_table = XCALLOC (errs *, nstates);
 
-  any_conflicts = 0;
-
   for (i = 0; i < nstates; i++)
     set_conflicts (i);
 }
@@ -285,7 +252,7 @@ initialize_conflicts (void)
 | Count the number of shift/reduce conflicts.  |
 `---------------------------------------------*/
 
-static void
+static int
 count_sr_conflicts (int state)
 {
   int i;
@@ -297,11 +264,11 @@ count_sr_conflicts (int state)
   unsigned *fp3;
   int symbol;
 
-  src_count = 0;
+  int src_count = 0;
 
-  shiftp = shift_table[state];
+  shiftp = state_table[state].shift_table;
   if (!shiftp)
-    return;
+    return 0;
 
   for (i = 0; i < tokensetsize; i++)
     {
@@ -314,18 +281,18 @@ count_sr_conflicts (int state)
     {
       if (!shiftp->shifts[i])
 	continue;
-      symbol = accessing_symbol[shiftp->shifts[i]];
+      symbol = state_table[shiftp->shifts[i]].accessing_symbol;
       if (ISVAR (symbol))
 	break;
       SETBIT (shiftset, symbol);
     }
 
-  k = lookaheads[state + 1];
+  k = state_table[state + 1].lookaheads;
   fp3 = lookaheadset + tokensetsize;
 
-  for (i = lookaheads[state]; i < k; i++)
+  for (i = state_table[state].lookaheads; i < k; i++)
     {
-      fp1 = LA + i * tokensetsize;
+      fp1 = LA (i);
       fp2 = lookaheadset;
 
       while (fp2 < fp3)
@@ -352,6 +319,8 @@ count_sr_conflicts (int state)
 	  fp2++;
 	}
     }
+
+  return src_count;
 }
 
 
@@ -359,33 +328,29 @@ count_sr_conflicts (int state)
 | Count the number of reduce/reduce conflicts.  |
 `----------------------------------------------*/
 
-static void
+static int
 count_rr_conflicts (int state)
 {
   int i;
-  int j;
-  int count;
   unsigned mask;
   unsigned *baseword;
-  unsigned *wordp;
-  int m;
-  int n;
 
-  rrc_count = 0;
+  int rrc_count = 0;
 
-  m = lookaheads[state];
-  n = lookaheads[state + 1];
+  int m = state_table[state].lookaheads;
+  int n = state_table[state + 1].lookaheads;
 
   if (n - m < 2)
-    return;
+    return 0;
 
   mask = 1;
-  baseword = LA + m * tokensetsize;
+  baseword = LA (m);
   for (i = 0; i < ntokens; i++)
     {
-      wordp = baseword;
+      unsigned *wordp = baseword;
 
-      count = 0;
+      int count = 0;
+      int j;
       for (j = m; j < n; j++)
 	{
 	  if (mask & *wordp)
@@ -404,6 +369,8 @@ count_rr_conflicts (int state)
 	  baseword++;
 	}
     }
+
+  return rrc_count;
 }
 
 /*--------------------------------------------------------------.
@@ -417,21 +384,25 @@ conflict_report (int src_num, int rrc_num)
   static char res[4096];
   char *cp = res;
 
-  if (src_num == 1)
-    sprintf (cp, _(" 1 shift/reduce conflict"));
-  else if (src_num > 1)
-    sprintf (cp, _(" %d shift/reduce conflicts"), src_num);
-  cp += strlen (cp);
+  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, _(" and"));
-  cp += strlen (cp);
+    {
+      sprintf (cp, " %s ", _("and"));
+      cp += strlen (cp);
+    }
 
-  if (rrc_num == 1)
-    sprintf (cp, _(" 1 reduce/reduce conflict"));
-  else if (rrc_num > 1)
-    sprintf (cp, _(" %d reduce/reduce conflicts"), rrc_num);
-  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';
@@ -441,37 +412,55 @@ conflict_report (int src_num, int rrc_num)
 }
 
 
-/*---------------------------------------------.
-| Compute and give a report on the conflicts.  |
-`---------------------------------------------*/
+/*-----------------------------------------------------------.
+| Output the detailed description of states with conflicts.  |
+`-----------------------------------------------------------*/
 
 void
-print_conflicts (void)
+conflicts_output (FILE *out)
 {
   int i;
+  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);
+      }
+}
 
-  src_total = 0;
-  rrc_total = 0;
 
-  /* Count the total number of conflicts, and if wanted, give a
-     detailed report in FOUTPUT.  */
+/*------------------------------------------.
+| Reporting the total number of conflicts.  |
+`------------------------------------------*/
+
+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;
+
+  int src_total = 0;
+  int rrc_total = 0;
+
+  /* Conflicts by state.  */
   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;
+    if (conflicts[i])
+      {
+	src_total += count_sr_conflicts (i);
+	rrc_total += count_rr_conflicts (i);
+      }
 
-	  if (verbose_flag)
-	    {
-	      obstack_fgrow1 (&output_obstack, _("State %d contains"), i);
-	      obstack_sgrow (&output_obstack,
-			     conflict_report (src_count, rrc_count));
-	    }
-	}
-    }
+  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)
@@ -489,14 +478,23 @@ print_conflicts (void)
     }
   else
     {
-      fprintf (stderr, _("%s contains"), infile);
+      fprintf (stderr, _("%s contains "), infile);
       fputs (conflict_report (src_total, rrc_total), stderr);
     }
+
+  if (expected_conflicts != -1 && !src_ok)
+    {
+      complain_message_count++;
+      fprintf (stderr, ngettext ("expected %d shift/reduce conflict\n",
+				 "expected %d shift/reduce conflicts\n",
+				 expected_conflicts),
+	       expected_conflicts);
+    }
 }
 
 
 void
-print_reductions (int state)
+print_reductions (FILE *out, int state)
 {
   int i;
   int j;
@@ -521,7 +519,7 @@ print_reductions (int state)
   for (i = 0; i < tokensetsize; i++)
     shiftset[i] = 0;
 
-  shiftp = shift_table[state];
+  shiftp = state_table[state].shift_table;
   if (shiftp)
     {
       k = shiftp->nshifts;
@@ -529,7 +527,7 @@ print_reductions (int state)
 	{
 	  if (!shiftp->shifts[i])
 	    continue;
-	  symbol = accessing_symbol[shiftp->shifts[i]];
+	  symbol = state_table[shiftp->shifts[i]].accessing_symbol;
 	  if (ISVAR (symbol))
 	    break;
 	  /* if this state has a shift for the error token,
@@ -553,14 +551,14 @@ print_reductions (int state)
 	}
     }
 
-  m = lookaheads[state];
-  n = lookaheads[state + 1];
+  m = state_table[state].lookaheads;
+  n = state_table[state + 1].lookaheads;
 
   if (n - m == 1 && !nodefault)
     {
       default_rule = LAruleno[m];
 
-      fp1 = LA + m * tokensetsize;
+      fp1 = LA (m);
       fp2 = shiftset;
       fp3 = lookaheadset;
       fp4 = lookaheadset + tokensetsize;
@@ -574,9 +572,9 @@ print_reductions (int state)
       for (i = 0; i < ntokens; i++)
 	{
 	  if (mask & *fp3)
-	    obstack_fgrow3 (&output_obstack,
-			    _("    %-4s\t[reduce using rule %d (%s)]\n"),
-			    tags[i], default_rule, tags[rlhs[default_rule]]);
+	    fprintf (out, _("    %-4s\t[reduce using rule %d (%s)]\n"),
+		     tags[i], default_rule,
+		     tags[rule_table[default_rule].lhs]);
 
 	  mask <<= 1;
 	  if (mask == 0)
@@ -586,9 +584,8 @@ print_reductions (int state)
 	    }
 	}
 
-      obstack_fgrow2 (&output_obstack,
-		      _("    $default\treduce using rule %d (%s)\n\n"),
-		      default_rule, tags[rlhs[default_rule]]);
+      fprintf (out, _("    $default\treduce using rule %d (%s)\n\n"),
+	       default_rule, tags[rule_table[default_rule].lhs]);
     }
   else if (n - m >= 1)
     {
@@ -599,7 +596,7 @@ print_reductions (int state)
       if (!nodefault)
 	for (i = m; i < n; i++)
 	  {
-	    fp1 = LA + i * tokensetsize;
+	    fp1 = LA (i);
 	    fp2 = shiftset;
 	    fp3 = lookaheadset;
 
@@ -646,7 +643,7 @@ print_reductions (int state)
 	    {
 	      if (!shiftp->shifts[i])
 		continue;
-	      symbol = accessing_symbol[shiftp->shifts[i]];
+	      symbol = state_table[shiftp->shifts[i]].accessing_symbol;
 	      if (ISVAR (symbol))
 		break;
 	      SETBIT (shiftset, symbol);
@@ -654,7 +651,7 @@ print_reductions (int state)
 	}
 
       mask = 1;
-      fp1 = LA + m * tokensetsize;
+      fp1 = LA (m);
       fp2 = shiftset;
       for (i = 0; i < ntokens; i++)
 	{
@@ -675,9 +672,9 @@ print_reductions (int state)
 		      if (j != default_LA)
 			{
 			  rule = LAruleno[j];
-			  obstack_fgrow3 (&output_obstack,
+			  fprintf (out,
 				   _("    %-4s\treduce using rule %d (%s)\n"),
-				   tags[i], rule, tags[rlhs[rule]]);
+				   tags[i], rule, tags[rule_table[rule].lhs]);
 			}
 		      else
 			defaulted = 1;
@@ -689,15 +686,15 @@ print_reductions (int state)
 		      if (defaulted)
 			{
 			  rule = LAruleno[default_LA];
-			  obstack_fgrow3 (&output_obstack,
+			  fprintf (out,
 				   _("    %-4s\treduce using rule %d (%s)\n"),
-				   tags[i], rule, tags[rlhs[rule]]);
+				   tags[i], rule, tags[rule_table[rule].lhs]);
 			  defaulted = 0;
 			}
 		      rule = LAruleno[j];
-		      obstack_fgrow3 (&output_obstack,
+		      fprintf (out,
 			       _("    %-4s\t[reduce using rule %d (%s)]\n"),
-			       tags[i], rule, tags[rlhs[rule]]);
+			       tags[i], rule, tags[rule_table[rule].lhs]);
 		    }
 		}
 
@@ -716,17 +713,14 @@ print_reductions (int state)
 	}
 
       if (default_LA >= 0)
-	obstack_fgrow2 (&output_obstack,
-			_("    $default\treduce using rule %d (%s)\n"),
-			default_rule, tags[rlhs[default_rule]]);
-
-      obstack_1grow (&output_obstack, '\n');
+	fprintf (out, _("    $default\treduce using rule %d (%s)\n"),
+		 default_rule, tags[rule_table[default_rule].lhs]);
     }
 }
 
 
 void
-finalize_conflicts (void)
+free_conflicts (void)
 {
   XFREE (conflicts);
   XFREE (shiftset);