X-Git-Url: https://git.saurik.com/bison.git/blobdiff_plain/29e8831621af57c5056380b68a96337e7647b850..ce4ccb4b11bb3d19681055cc2b732493603d3508:/src/print.c

diff --git a/src/print.c b/src/print.c
index 72b4cd0a..76e5f740 100644
--- a/src/print.c
+++ b/src/print.c
@@ -1,5 +1,6 @@
 /* Print information on generated parser, for bison,
-   Copyright 1984, 1986, 1989, 2000, 2001 Free Software Foundation, Inc.
+   Copyright (C) 1984, 1986, 1989, 2000, 2001, 2002
+   Free Software Foundation, Inc.
 
    This file is part of Bison, the GNU Compiler Compiler.
 
@@ -33,9 +34,10 @@
 #include "print.h"
 #include "reduce.h"
 #include "closure.h"
+#include "bitset.h"
 
-static unsigned *shiftset = NULL;
-static unsigned *lookaheadset = NULL;
+static bitset shiftset;
+static bitset lookaheadset;
 
 #if 0
 static void
@@ -45,19 +47,6 @@ print_token (int extnum, int token)
 }
 #endif
 
-static inline const char *
-escape (const char *s)
-{
-  return quotearg_n_style (1, escape_quoting_style, s);
-}
-
-/* Be cautious not to use twice the same slot in a single expression. */
-static inline const char *
-escape2 (const char *s)
-{
-  return quotearg_n_style (2, escape_quoting_style, s);
-}
-
 
 /*--------------------------------.
 | Report information on a state.  |
@@ -67,48 +56,51 @@ static void
 print_core (FILE *out, state_t *state)
 {
   int i;
-  short *sitems = state->items;
-  int snitems   = state->nitems;
+  item_number_t *sitems = state->items;
+  int snritems   = state->nitems;
+  symbol_t *previous_lhs = NULL;
 
-  /* New experimental feature: if TRACE_FLAGS output all the items of
-     a state, not only its kernel.  */
-  if (trace_flag)
+  /* Output all the items of a state, not only its kernel.  */
+  if (report_flag & report_itemsets)
     {
-      closure (sitems, snitems);
+      closure (sitems, snritems);
       sitems = itemset;
-      snitems = nitemset;
+      snritems = nritemset;
     }
 
-  if (snitems)
-    {
-      for (i = 0; i < snitems; i++)
-	{
-	  short *sp;
-	  short *sp1;
-	  int rule;
+  if (!snritems)
+    return;
 
-	  sp1 = sp = ritem + sitems[i];
+  for (i = 0; i < snritems; i++)
+    {
+      item_number_t *sp;
+      item_number_t *sp1;
+      int rule;
 
-	  while (*sp >= 0)
-	    sp++;
+      sp1 = sp = ritem + sitems[i];
 
-	  rule = -(*sp);
-	  fprintf (out, "    %s  ->  ", escape (symbols[rules[rule].lhs]->tag));
+      while (*sp >= 0)
+	sp++;
 
-	  for (sp = ritem + rules[rule].rhs; sp < sp1; sp++)
-	    fprintf (out, "%s ", escape (symbols[*sp]->tag));
+      rule = -(*sp);
 
-	  fputc ('.', out);
+      rule_lhs_print (&rules[rule], previous_lhs, out);
+      previous_lhs = rules[rule].lhs;
 
-	  for (/* Nothing */; *sp >= 0; ++sp)
-	    fprintf (out, " %s", escape (symbols[*sp]->tag));
+      for (sp = rules[rule].rhs; sp < sp1; sp++)
+	fprintf (out, " %s", symbol_tag_get (symbols[*sp]));
+      fputs (" .", out);
+      for (/* Nothing */; *sp >= 0; ++sp)
+	fprintf (out, " %s", symbol_tag_get (symbols[*sp]));
 
-	  fprintf (out, _("   (rule %d)"), rule - 1);
-	  fputc ('\n', out);
-	}
+      /* Display the lookaheads?  */
+      if (report_flag & report_lookaheads)
+	state_rule_lookaheads_print (state, &rules[rule], out);
 
       fputc ('\n', out);
     }
+
+  fputc ('\n', out);
 }
 
 
@@ -116,16 +108,16 @@ static void
 print_shifts (FILE *out, state_t *state)
 {
   int i;
-  shifts *shiftp = state->shifts;
+  shifts_t *shiftp = state->shifts;
 
   for (i = 0; i < shiftp->nshifts && SHIFT_IS_SHIFT (shiftp, i); i++)
     if (!SHIFT_IS_DISABLED (shiftp, i))
       {
-	int state1 = shiftp->shifts[i];
-	int symbol = states[state1]->accessing_symbol;
+	state_number_t state1 = shiftp->shifts[i];
+	symbol_number_t symbol = states[state1]->accessing_symbol;
 	fprintf (out,
 		 _("    %-4s\tshift, and go to state %d\n"),
-		 escape (symbols[symbol]->tag), state1);
+		 symbol_tag_get (symbols[symbol]), state1);
       }
 
   if (i > 0)
@@ -136,13 +128,13 @@ print_shifts (FILE *out, state_t *state)
 static void
 print_errs (FILE *out, state_t *state)
 {
-  errs *errp = state->errs;
+  errs_t *errp = state->errs;
   int i;
 
   for (i = 0; i < errp->nerrs; ++i)
     if (errp->errs[i])
       fprintf (out, _("    %-4s\terror (nonassociative)\n"),
-	       escape (symbols[errp->errs[i]]->tag));
+	       symbol_tag_get (symbols[errp->errs[i]]));
 
   if (i > 0)
     fputc ('\n', out);
@@ -153,7 +145,7 @@ static void
 print_gotos (FILE *out, state_t *state)
 {
   int i;
-  shifts *shiftp = state->shifts;
+  shifts_t *shiftp = state->shifts;
 
   for (i = 0; i < shiftp->nshifts && SHIFT_IS_SHIFT (shiftp, i); i++)
     /* Skip token shifts.  */;
@@ -163,170 +155,170 @@ print_gotos (FILE *out, state_t *state)
       for (; i < shiftp->nshifts; i++)
 	if (!SHIFT_IS_DISABLED (shiftp, i))
 	  {
-	    int state1 = shiftp->shifts[i];
-	    int symbol = states[state1]->accessing_symbol;
+	    state_number_t state1 = shiftp->shifts[i];
+	    symbol_number_t symbol = states[state1]->accessing_symbol;
 	    fprintf (out, _("    %-4s\tgo to state %d\n"),
-		     escape (symbols[symbol]->tag), state1);
+		     symbol_tag_get (symbols[symbol]), state1);
 	  }
 
       fputc ('\n', out);
     }
 }
 
-static void
-print_reductions (FILE *out, state_t *state)
+
+/*----------------------------------------------------------.
+| Return the default rule of this STATE if it has one, NULL |
+| otherwise.                                                |
+`----------------------------------------------------------*/
+
+static rule_t *
+state_default_rule_compute (state_t *state)
 {
+  reductions_t *redp = state->reductions;
+  rule_t *default_rule = NULL;
+  int cmax = 0;
   int i;
-  shifts *shiftp = state->shifts;
-  reductions *redp = state->reductions;
-  errs *errp = state->errs;
-  int nodefault = 0;
-
-  if (redp->nreds == 0)
-    return;
 
+  /* No need for a lookahead.  */
   if (state->consistent)
+    return &rules[redp->rules[0]];
+
+  /* 1. Each reduction is possibly masked by the lookaheads on which
+     we shift (S/R conflicts)...  */
+  bitset_zero (shiftset);
+  {
+    shifts_t *shiftp = state->shifts;
+    for (i = 0; i < shiftp->nshifts && SHIFT_IS_SHIFT (shiftp, i); i++)
+      if (!SHIFT_IS_DISABLED (shiftp, i))
+	{
+	  /* If this state has a shift for the error token, don't use a
+	     default rule.  */
+	  if (SHIFT_IS_ERROR (shiftp, i))
+	    return NULL;
+	  bitset_set (shiftset, SHIFT_SYMBOL (shiftp, i));
+	}
+  }
+
+  /* 2. Each reduction is possibly masked by the lookaheads on which
+     we raise an error (due to %nonassoc).  */
+  {
+    errs_t *errp = state->errs;
+    for (i = 0; i < errp->nerrs; i++)
+      if (errp->errs[i])
+	bitset_set (shiftset, errp->errs[i]);
+  }
+
+  for (i = 0; i < state->nlookaheads; ++i)
     {
-      int rule = redp->rules[0];
-      int symbol = rules[rule].lhs;
-      fprintf (out, _("    $default\treduce using rule %d (%s)\n\n"),
-	       rule - 1, escape (symbols[symbol]->tag));
-      return;
+      int count = 0;
+
+      /* How many non-masked lookaheads are there for this reduction?
+	 */
+      bitset_andn (lookaheadset, state->lookaheads[i], shiftset);
+      count = bitset_count (lookaheadset);
+
+      if (count > cmax)
+	{
+	  cmax = count;
+	  default_rule = state->lookaheads_rule[i];
+	}
+
+      /* 3. And finally, each reduction is possibly masked by previous
+	 reductions (in R/R conflicts, we keep the first reductions).
+	 */
+      bitset_or (shiftset, shiftset, state->lookaheads[i]);
     }
 
-  for (i = 0; i < tokensetsize; i++)
-    shiftset[i] = 0;
+  return default_rule;
+}
 
-  for (i = 0; i < shiftp->nshifts && SHIFT_IS_SHIFT (shiftp, i); i++)
-    if (!SHIFT_IS_DISABLED (shiftp, i))
-      {
-	/* if this state has a shift for the error token, don't use a
-	   default rule.  */
-	if (SHIFT_IS_ERROR (shiftp, i))
-	  nodefault = 1;
-	SETBIT (shiftset, SHIFT_SYMBOL (shiftp, i));
-      }
 
-  for (i = 0; i < errp->nerrs; i++)
-    if (errp->errs[i])
-      SETBIT (shiftset, errp->errs[i]);
+/*----------------------------------------------------.
+| Report on OUT the reduction actions of this STATE.  |
+`----------------------------------------------------*/
 
-  if (state->nlookaheads == 1 && !nodefault)
-    {
-      int k;
-      int default_rule = LAruleno[state->lookaheadsp];
+static void
+print_reductions (FILE *out, state_t *state)
+{
+  int i;
+  shifts_t *shiftp = state->shifts;
+  reductions_t *redp = state->reductions;
+  rule_t *default_rule = NULL;
 
-      for (k = 0; k < tokensetsize; ++k)
-	lookaheadset[k] = LA (state->lookaheadsp)[k] & shiftset[k];
+  if (redp->nreds == 0)
+    return;
 
-      for (i = 0; i < ntokens; i++)
-	if (BITISSET (lookaheadset, i))
-	  fprintf (out, _("    %-4s\t[reduce using rule %d (%s)]\n"),
-		   escape (symbols[i]->tag), default_rule - 1,
-		   escape2 (symbols[rules[default_rule].lhs]->tag));
+  default_rule = state_default_rule_compute (state);
 
-      fprintf (out, _("    $default\treduce using rule %d (%s)\n\n"),
-	       default_rule - 1, escape (symbols[rules[default_rule].lhs]->tag));
-    }
-  else if (state->nlookaheads >= 1)
+  bitset_zero (shiftset);
+  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 (i = 0; i < ntokens; i++)
     {
-      int cmax = 0;
-      int default_LA = -1;
-      int default_rule = 0;
+      int j;
+      int defaulted = 0;
+      int count = bitset_test (shiftset, i);
 
-      if (!nodefault)
-	for (i = 0; i < state->nlookaheads; ++i)
+      for (j = 0; j < state->nlookaheads; ++j)
+	if (bitset_test (state->lookaheads[j], i))
 	  {
-	    int count = 0;
-	    int j, k;
-
-	    for (k = 0; k < tokensetsize; ++k)
-	      lookaheadset[k] = LA (state->lookaheadsp + i)[k] & ~shiftset[k];
-
-	    for (j = 0; j < ntokens; j++)
-	      if (BITISSET (lookaheadset, j))
+	    if (count == 0)
+	      {
+		if (state->lookaheads_rule[j] != default_rule)
+		  fprintf (out,
+			   _("    %-4s\treduce using rule %d (%s)\n"),
+			   symbol_tag_get (symbols[i]),
+			   state->lookaheads_rule[j]->number - 1,
+			   symbol_tag_get_n (state->lookaheads_rule[j]->lhs, 1));
+		else
+		  defaulted = 1;
 		count++;
-
-	    if (count > cmax)
+	      }
+	    else
 	      {
-		cmax = count;
-		default_LA = state->lookaheadsp + i;
-		default_rule = LAruleno[state->lookaheadsp + i];
+		if (defaulted)
+		  fprintf (out,
+			   _("    %-4s\treduce using rule %d (%s)\n"),
+			   symbol_tag_get (symbols[i]),
+			   default_rule->number - 1,
+			   symbol_tag_get_n (default_rule->lhs, 1));
+		defaulted = 0;
+		fprintf (out,
+			 _("    %-4s\t[reduce using rule %d (%s)]\n"),
+			 symbol_tag_get (symbols[i]),
+			 state->lookaheads_rule[j]->number - 1,
+			 symbol_tag_get_n (state->lookaheads_rule[j]->lhs, 1));
 	      }
-
-	    for (k = 0; k < tokensetsize; ++k)
-	      shiftset[k] |= lookaheadset[k];
 	  }
-
-      for (i = 0; i < tokensetsize; i++)
-	shiftset[i] = 0;
-
-      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 (i = 0; i < ntokens; i++)
-	{
-	  int j;
-	  int defaulted = 0;
-	  int count = BITISSET (shiftset, i);
-
-	  for (j = 0; j < state->nlookaheads; ++j)
-	    {
-	      if (BITISSET (LA (state->lookaheadsp + j), i))
-		{
-		  if (count == 0)
-		    {
-		      if (state->lookaheadsp + j != default_LA)
-			fprintf (out,
-				 _("    %-4s\treduce using rule %d (%s)\n"),
-				 escape (symbols[i]->tag),
-				 LAruleno[state->lookaheadsp + j] - 1,
-				 escape2 (symbols[rules[LAruleno[state->lookaheadsp + j]].lhs]->tag));
-		      else
-			defaulted = 1;
-
-		      count++;
-		    }
-		  else
-		    {
-		      if (defaulted)
-			fprintf (out,
-				 _("    %-4s\treduce using rule %d (%s)\n"),
-				 escape (symbols[i]->tag),
-				 LAruleno[default_LA] - 1,
-				 escape2 (symbols[rules[LAruleno[default_LA]].lhs]->tag));
-		      defaulted = 0;
-		      fprintf (out,
-			       _("    %-4s\t[reduce using rule %d (%s)]\n"),
-			       escape (symbols[i]->tag),
-			       LAruleno[state->lookaheadsp + j] - 1,
-			       escape2 (symbols[rules[LAruleno[state->lookaheadsp + j]].lhs]->tag));
-		    }
-		}
-	    }
-	}
-
-      if (default_LA >= 0)
-	fprintf (out, _("    $default\treduce using rule %d (%s)\n"),
-		 default_rule - 1,
-		 escape (symbols[rules[default_rule].lhs]->tag));
     }
+
+  if (default_rule)
+    fprintf (out, _("    $default\treduce using rule %d (%s)\n"),
+	     default_rule->number - 1,
+	     symbol_tag_get (default_rule->lhs));
+  fputc ('\n', out);
 }
 
 
+/*--------------------------------------------------------------.
+| Report on OUT all the actions (shifts, gotos, reductions, and |
+| explicit erros from %nonassoc) of STATE.                      |
+`--------------------------------------------------------------*/
+
 static void
 print_actions (FILE *out, state_t *state)
 {
-  reductions *redp = state->reductions;
-  shifts *shiftp = state->shifts;
+  reductions_t *redp = state->reductions;
+  shifts_t *shiftp = state->shifts;
 
   if (shiftp->nshifts == 0 && redp->nreds == 0)
     {
-      if (final_state == state->number)
-       fprintf (out, _("    $default\taccept\n"));
+      if (state->number == final_state->number)
+	fprintf (out, _("    $default\taccept\n"));
       else
-       fprintf (out, _("    NO ACTIONS\n"));
+	fprintf (out, _("    NO ACTIONS\n"));
       return;
     }
 
@@ -336,6 +328,7 @@ print_actions (FILE *out, state_t *state)
   print_gotos (out, state);
 }
 
+
 static void
 print_state (FILE *out, state_t *state)
 {
@@ -343,6 +336,9 @@ print_state (FILE *out, state_t *state)
   fputs ("\n\n", out);
   print_core (out, state);
   print_actions (out, state);
+  if ((report_flag & report_solved_conflicts)
+      && state->solved_conflicts)
+    fputs (state->solved_conflicts, out);
   fputs ("\n\n", out);
 }
 
@@ -364,48 +360,33 @@ do {						\
 static void
 print_grammar (FILE *out)
 {
-  int i, j;
-  short *rule;
+  symbol_number_t i;
   char buffer[90];
   int column = 0;
 
-  /* rule # : LHS -> RHS */
-  fprintf (out, "%s\n\n", _("Grammar"));
-  fprintf (out, "  %s\n", _("Number, Line, Rule"));
-  for (i = 1; i <= nrules; i++)
-    /* Don't print rules disabled in reduce_grammar_tables.  */
-    if (rules[i].useful)
-      {
-	fprintf (out, _("  %3d %3d %s ->"),
-		 i - 1, rules[i].line, escape (symbols[rules[i].lhs]->tag));
-	rule = &ritem[rules[i].rhs];
-	if (*rule >= 0)
-	  while (*rule >= 0)
-	    fprintf (out, " %s", escape (symbols[*rule++]->tag));
-	else
-	  fprintf (out, " /* %s */", _("empty"));
-	fputc ('\n', out);
-      }
-  fputs ("\n\n", out);
-
+  grammar_rules_print (out);
 
   /* TERMINAL (type #) : rule #s terminal is on RHS */
   fprintf (out, "%s\n\n", _("Terminals, with rules where they appear"));
-  for (i = 0; i <= max_user_token_number; i++)
-    if (token_translations[i] != 2)
+  for (i = 0; i < max_user_token_number + 1; i++)
+    if (token_translations[i] != undeftoken->number)
       {
+	const char *tag = symbol_tag_get (symbols[token_translations[i]]);
+	rule_number_t r;
+	item_number_t *rhsp;
+
 	buffer[0] = 0;
-	column = strlen (escape (symbols[token_translations[i]]->tag));
-	fputs (escape (symbols[token_translations[i]]->tag), out);
+	column = strlen (tag);
+	fputs (tag, out);
 	END_TEST (50);
 	sprintf (buffer, " (%d)", i);
 
-	for (j = 1; j <= nrules; j++)
-	  for (rule = &ritem[rules[j].rhs]; *rule >= 0; rule++)
-	    if (*rule == token_translations[i])
+	for (r = 1; r < nrules + 1; r++)
+	  for (rhsp = rules[r].rhs; *rhsp >= 0; rhsp++)
+	    if (item_number_as_symbol_number (*rhsp) == token_translations[i])
 	      {
 		END_TEST (65);
-		sprintf (buffer + strlen (buffer), " %d", j - 1);
+		sprintf (buffer + strlen (buffer), " %d", r - 1);
 		break;
 	      }
 	fprintf (out, "%s\n", buffer);
@@ -414,16 +395,19 @@ print_grammar (FILE *out)
 
 
   fprintf (out, "%s\n\n", _("Nonterminals, with rules where they appear"));
-  for (i = ntokens; i <= nsyms - 1; i++)
+  for (i = ntokens; i < nsyms; i++)
     {
       int left_count = 0, right_count = 0;
+      rule_number_t r;
+      const char *tag = symbol_tag_get (symbols[i]);
 
-      for (j = 1; j <= nrules; j++)
+      for (r = 1; r < nrules + 1; r++)
 	{
-	  if (rules[j].lhs == i)
+	  item_number_t *rhsp;
+	  if (rules[r].lhs->number == i)
 	    left_count++;
-	  for (rule = &ritem[rules[j].rhs]; *rule >= 0; rule++)
-	    if (*rule == i)
+	  for (rhsp = rules[r].rhs; *rhsp >= 0; rhsp++)
+	    if (item_number_as_symbol_number (*rhsp) == i)
 	      {
 		right_count++;
 		break;
@@ -431,8 +415,8 @@ print_grammar (FILE *out)
 	}
 
       buffer[0] = 0;
-      fputs (escape (symbols[i]->tag), out);
-      column = strlen (escape (symbols[i]->tag));
+      fputs (tag, out);
+      column = strlen (tag);
       sprintf (buffer, " (%d)", i);
       END_TEST (0);
 
@@ -441,11 +425,11 @@ print_grammar (FILE *out)
 	  END_TEST (50);
 	  sprintf (buffer + strlen (buffer), _(" on left:"));
 
-	  for (j = 1; j <= nrules; j++)
+	  for (r = 1; r < nrules + 1; r++)
 	    {
 	      END_TEST (65);
-	      if (rules[j].lhs == i)
-		sprintf (buffer + strlen (buffer), " %d", j - 1);
+	      if (rules[r].lhs->number == i)
+		sprintf (buffer + strlen (buffer), " %d", r - 1);
 	    }
 	}
 
@@ -455,13 +439,14 @@ print_grammar (FILE *out)
 	    sprintf (buffer + strlen (buffer), ",");
 	  END_TEST (50);
 	  sprintf (buffer + strlen (buffer), _(" on right:"));
-	  for (j = 1; j <= nrules; j++)
+	  for (r = 1; r < nrules + 1; r++)
 	    {
-	      for (rule = &ritem[rules[j].rhs]; *rule >= 0; rule++)
-		if (*rule == i)
+	      item_number_t *rhsp;
+	      for (rhsp = rules[r].rhs; *rhsp >= 0; rhsp++)
+		if (item_number_as_symbol_number (*rhsp) == i)
 		  {
 		    END_TEST (65);
-		    sprintf (buffer + strlen (buffer), " %d", j - 1);
+		    sprintf (buffer + strlen (buffer), " %d", r - 1);
 		    break;
 		  }
 	    }
@@ -474,37 +459,29 @@ print_grammar (FILE *out)
 void
 print_results (void)
 {
-  int i;
+  state_number_t i;
 
   /* We used to use just .out if SPEC_NAME_PREFIX (-p) was used, but
      that conflicts with Posix.  */
   FILE *out = xfopen (spec_verbose_file, "w");
 
-  size_t size = obstack_object_size (&output_obstack);
-  fwrite (obstack_finish (&output_obstack), 1, size, out);
-  obstack_free (&output_obstack, NULL);
-
-  if (size)
-    fputs ("\n\n", out);
-
   reduce_output (out);
   conflicts_output (out);
 
   print_grammar (out);
 
-  /* New experimental feature: output all the items of a state, not
-     only its kernel.  Requires to run closure, which need memory
-     allocation/deallocation.  */
-  if (trace_flag)
+  /* If the whole state item sets, not only the kernels, are wanted,
+     `closure' will be run, which needs memory allocation/deallocation.   */
+  if (report_flag & report_itemsets)
     new_closure (nritems);
   /* Storage for print_reductions.  */
-  shiftset = XCALLOC (unsigned, tokensetsize);
-  lookaheadset = XCALLOC (unsigned, tokensetsize);
+  shiftset =  bitset_create (ntokens, BITSET_FIXED);
+  lookaheadset = bitset_create (ntokens, BITSET_FIXED);
   for (i = 0; i < nstates; i++)
     print_state (out, states[i]);
-  free (shiftset);
-  free (lookaheadset);
-  if (trace_flag)
+  bitset_free (shiftset);
+  bitset_free (lookaheadset);
+  if (report_flag & report_itemsets)
     free_closure ();
 
   xfclose (out);