X-Git-Url: https://git.saurik.com/bison.git/blobdiff_plain/f693ad146e6e4951662d60903b8512d518cb09da..0b7fba1335c0c3fde1eab89e265cbcecf20885a8:/src/print.c

diff --git a/src/print.c b/src/print.c
index e80b5239..cb227aa5 100644
--- a/src/print.c
+++ b/src/print.c
@@ -1,36 +1,44 @@
 /* Print information on generated parser, for bison,
-   Copyright 1984, 1986, 1989, 2000, 2001 Free Software Foundation, Inc.
+
+   Copyright (C) 1984, 1986, 1989, 2000-2005, 2007, 2009-2012 Free
+   Software Foundation, Inc.
 
    This file is part of Bison, the GNU Compiler Compiler.
 
-   Bison is free software; you can redistribute it and/or modify
+   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 2, or (at your option)
-   any later version.
+   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,
+   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
-   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 "files.h"
-#include "gram.h"
+
+#include <bitset.h>
+
 #include "LR0.h"
-#include "lalr.h"
+#include "closure.h"
 #include "conflicts.h"
+#include "files.h"
 #include "getargs.h"
-#include "state.h"
-#include "reader.h"
+#include "gram.h"
+#include "lalr.h"
+#include "muscle-tab.h"
 #include "print.h"
+#include "reader.h"
 #include "reduce.h"
-#include "closure.h"
+#include "state.h"
+#include "symtab.h"
+#include "tables.h"
+
+static bitset no_reduce_set;
 
 #if 0
 static void
@@ -41,147 +49,336 @@ print_token (int extnum, int token)
 #endif
 
 
+
+/*---------------------------------------.
+| *WIDTH := max (*WIDTH, strlen (STR)).  |
+`---------------------------------------*/
+
+static void
+max_length (size_t *width, const char *str)
+{
+  size_t len = strlen (str);
+  if (len > *width)
+    *width = len;
+}
+
 /*--------------------------------.
 | Report information on a state.  |
 `--------------------------------*/
 
 static void
-print_core (FILE *out, int state)
+print_core (FILE *out, state *s)
 {
-  int i;
-  short *sitems = state_table[state]->items;
-  int snitems   = state_table[state]->nitems;
+  size_t i;
+  item_number *sitems = s->items;
+  size_t snritems = s->nitems;
+  symbol *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 = nitemset;
     }
 
-  if (snitems)
-    {
-      for (i = 0; i < snitems; i++)
-	{
-	  short *sp;
-	  short *sp1;
-	  int rule;
+  if (!snritems)
+    return;
 
-	  sp1 = sp = ritem + sitems[i];
+  fputc ('\n', out);
 
-	  while (*sp > 0)
-	    sp++;
+  for (i = 0; i < snritems; i++)
+    {
+      item_number *sp;
+      item_number *sp1;
+      rule_number r;
 
-	  rule = -(*sp);
-	  fprintf (out, "    %s  ->  ", tags[rule_table[rule].lhs]);
+      sp1 = sp = ritem + sitems[i];
 
-	  for (sp = ritem + rule_table[rule].rhs; sp < sp1; sp++)
-	    fprintf (out, "%s ", tags[*sp]);
+      while (*sp >= 0)
+	sp++;
 
-	  fputc ('.', out);
+      r = item_number_as_rule_number (*sp);
 
-	  for (/* Nothing */; *sp > 0; ++sp)
-	    fprintf (out, " %s", tags[*sp]);
+      rule_lhs_print (&rules[r], previous_lhs, out);
+      previous_lhs = rules[r].lhs;
 
-	  fprintf (out, _("   (rule %d)"), rule);
-	  fputc ('\n', out);
-	}
+      for (sp = rules[r].rhs; sp < sp1; sp++)
+	fprintf (out, " %s", symbols[*sp]->tag);
+      fputs (" .", out);
+      for (/* Nothing */; *sp >= 0; ++sp)
+	fprintf (out, " %s", symbols[*sp]->tag);
+
+      /* Display the lookahead tokens?  */
+      if (report_flag & report_lookahead_tokens
+          && item_number_is_rule_number (*sp1))
+	state_rule_lookahead_tokens_print (s, &rules[r], out);
 
       fputc ('\n', out);
     }
 }
 
+
+/*------------------------------------------------------------.
+| Report the shifts iff DISPLAY_SHIFTS_P or the gotos of S on |
+| OUT.                                                        |
+`------------------------------------------------------------*/
+
 static void
-print_actions (FILE *out, int state)
+print_transitions (state *s, FILE *out, bool display_transitions_p)
 {
+  transitions *trans = s->transitions;
+  size_t width = 0;
   int i;
 
-  shifts   *shiftp = state_table[state]->shifts;
-  reductions *redp = state_table[state]->reductions;
-  errs       *errp = state_table[state]->errs;
+  /* Compute the width of the lookahead token column.  */
+  for (i = 0; i < trans->num; i++)
+    if (!TRANSITION_IS_DISABLED (trans, i)
+	&& TRANSITION_IS_SHIFT (trans, i) == display_transitions_p)
+      {
+	symbol *sym = symbols[TRANSITION_SYMBOL (trans, i)];
+	max_length (&width, sym->tag);
+      }
 
-  if (!shiftp->nshifts && !redp)
-    {
-      if (final_state == state)
-	fprintf (out, _("    $default\taccept\n"));
-      else
-	fprintf (out, _("    NO ACTIONS\n"));
-      return;
-    }
+  /* Nothing to report. */
+  if (!width)
+    return;
+
+  fputc ('\n', out);
+  width += 2;
 
-  for (i = 0; i < shiftp->nshifts; i++)
-    if (!SHIFT_IS_DISABLED (shiftp, i))
+  /* Report lookahead tokens and shifts.  */
+  for (i = 0; i < trans->num; i++)
+    if (!TRANSITION_IS_DISABLED (trans, i)
+	&& TRANSITION_IS_SHIFT (trans, i) == display_transitions_p)
       {
-	int state1 = shiftp->shifts[i];
-	int symbol = state_table[state1]->accessing_symbol;
-	/* The following line used to be turned off.  */
-	if (ISVAR (symbol))
-	  break;
-	if (symbol == 0)	/* I.e. strcmp(tags[symbol],"$")==0 */
-	  fprintf (out,
-		   _("    $   \tgo to state %d\n"), state1);
+	symbol *sym = symbols[TRANSITION_SYMBOL (trans, i)];
+	const char *tag = sym->tag;
+	state *s1 = trans->states[i];
+	int j;
+
+	fprintf (out, "    %s", tag);
+	for (j = width - strlen (tag); j > 0; --j)
+	  fputc (' ', out);
+	if (display_transitions_p)
+	  fprintf (out, _("shift, and go to state %d\n"), s1->number);
 	else
-	  fprintf (out,
-		   _("    %-4s\tshift, and go to state %d\n"),
-		   tags[symbol], state1);
+	  fprintf (out, _("go to state %d\n"), s1->number);
       }
+}
 
-  if (i > 0)
-    fputc ('\n', out);
 
-  if (errp)
-    {
-      int j;
-      for (j = 0; j < errp->nerrs; j++)
-	{
-	  int symbol = errp->errs[j];
-	  if (!symbol)
-	    continue;
-	  fprintf (out, _("    %-4s\terror (nonassociative)\n"),
-		   tags[symbol]);
-	}
+/*--------------------------------------------------------.
+| Report the explicit errors of S raised from %nonassoc.  |
+`--------------------------------------------------------*/
 
-      if (j > 0)
-	fputc ('\n', out);
-    }
+static void
+print_errs (FILE *out, state *s)
+{
+  errs *errp = s->errs;
+  size_t width = 0;
+  int i;
 
-  if (state_table[state]->consistent && redp)
-    {
-      int rule = redp->rules[0];
-      int symbol = rule_table[rule].lhs;
-      fprintf (out, _("    $default\treduce using rule %d (%s)\n\n"),
-	       rule, tags[symbol]);
-    }
-  else if (redp)
+  /* Compute the width of the lookahead token column.  */
+  for (i = 0; i < errp->num; ++i)
+    if (errp->symbols[i])
+      max_length (&width, errp->symbols[i]->tag);
+
+  /* Nothing to report. */
+  if (!width)
+    return;
+
+  fputc ('\n', out);
+  width += 2;
+
+  /* Report lookahead tokens and errors.  */
+  for (i = 0; i < errp->num; ++i)
+    if (errp->symbols[i])
+      {
+	const char *tag = errp->symbols[i]->tag;
+	int j;
+	fprintf (out, "    %s", tag);
+	for (j = width - strlen (tag); j > 0; --j)
+	  fputc (' ', out);
+	fputs (_("error (nonassociative)\n"), out);
+      }
+}
+
+
+/*-------------------------------------------------------------------------.
+| Report a reduction of RULE on LOOKAHEAD_TOKEN (which can be `default').  |
+| If not ENABLED, the rule is masked by a shift or a reduce (S/R and       |
+| R/R conflicts).                                                          |
+`-------------------------------------------------------------------------*/
+
+static void
+print_reduction (FILE *out, size_t width,
+		 const char *lookahead_token,
+		 rule *r, bool enabled)
+{
+  int j;
+  fprintf (out, "    %s", lookahead_token);
+  for (j = width - strlen (lookahead_token); j > 0; --j)
+    fputc (' ', out);
+  if (!enabled)
+    fputc ('[', out);
+  if (r->number)
+    fprintf (out, _("reduce using rule %d (%s)"), r->number, r->lhs->tag);
+  else
+    fprintf (out, _("accept"));
+  if (!enabled)
+    fputc (']', out);
+  fputc ('\n', out);
+}
+
+
+/*-------------------------------------------.
+| Report on OUT the reduction actions of S.  |
+`-------------------------------------------*/
+
+static void
+print_reductions (FILE *out, state *s)
+{
+  transitions *trans = s->transitions;
+  reductions *reds = s->reductions;
+  rule *default_reduction = NULL;
+  size_t width = 0;
+  int i, j;
+  bool default_reduction_only = true;
+
+  if (reds->num == 0)
+    return;
+
+  if (yydefact[s->number] != 0)
+    default_reduction = &rules[yydefact[s->number] - 1];
+
+  bitset_zero (no_reduce_set);
+  FOR_EACH_SHIFT (trans, i)
+    bitset_set (no_reduce_set, TRANSITION_SYMBOL (trans, i));
+  for (i = 0; i < s->errs->num; ++i)
+    if (s->errs->symbols[i])
+      bitset_set (no_reduce_set, s->errs->symbols[i]->number);
+
+  /* Compute the width of the lookahead token column.  */
+  if (default_reduction)
+    width = strlen (_("$default"));
+
+  if (reds->lookahead_tokens)
+    for (i = 0; i < ntokens; i++)
+      {
+	bool count = bitset_test (no_reduce_set, i);
+
+	for (j = 0; j < reds->num; ++j)
+	  if (bitset_test (reds->lookahead_tokens[j], i))
+	    {
+	      if (! count)
+		{
+		  if (reds->rules[j] != default_reduction)
+		    max_length (&width, symbols[i]->tag);
+		  count = true;
+		}
+	      else
+		{
+		  max_length (&width, symbols[i]->tag);
+		}
+	    }
+      }
+
+  /* Nothing to report. */
+  if (!width)
+    return;
+
+  fputc ('\n', out);
+  width += 2;
+
+  /* Report lookahead tokens (or $default) and reductions.  */
+  if (reds->lookahead_tokens)
+    for (i = 0; i < ntokens; i++)
+      {
+	bool defaulted = false;
+	bool count = bitset_test (no_reduce_set, i);
+        if (count)
+          default_reduction_only = false;
+
+	for (j = 0; j < reds->num; ++j)
+	  if (bitset_test (reds->lookahead_tokens[j], i))
+	    {
+	      if (! count)
+		{
+		  if (reds->rules[j] != default_reduction)
+                    {
+                      default_reduction_only = false;
+                      print_reduction (out, width,
+                                       symbols[i]->tag,
+                                       reds->rules[j], true);
+                    }
+		  else
+		    defaulted = true;
+		  count = true;
+		}
+	      else
+		{
+                  default_reduction_only = false;
+		  if (defaulted)
+		    print_reduction (out, width,
+				     symbols[i]->tag,
+				     default_reduction, true);
+		  defaulted = false;
+		  print_reduction (out, width,
+				   symbols[i]->tag,
+				   reds->rules[j], false);
+		}
+	    }
+      }
+
+  if (default_reduction)
     {
-      print_reductions (out, state);
+      char *default_reductions =
+        muscle_percent_define_get ("lr.default-reductions");
+      print_reduction (out, width, _("$default"), default_reduction, true);
+      aver (0 == strcmp (default_reductions, "most")
+            || (0 == strcmp (default_reductions, "consistent")
+                && default_reduction_only)
+            || (reds->num == 1 && reds->rules[0]->number == 0));
+      free (default_reductions);
     }
+}
 
-  if (i < shiftp->nshifts)
-    {
-      for (; i < shiftp->nshifts; i++)
-	if (!SHIFT_IS_DISABLED (shiftp, i))
-	  {
-	    int state1 = shiftp->shifts[i];
-	    int symbol = state_table[state1]->accessing_symbol;
-	    fprintf (out, _("    %-4s\tgo to state %d\n"),
-		     tags[symbol], state1);
-	  }
 
-      fputc ('\n', out);
-    }
+/*--------------------------------------------------------------.
+| Report on OUT all the actions (shifts, gotos, reductions, and |
+| explicit erros from %nonassoc) of S.                          |
+`--------------------------------------------------------------*/
+
+static void
+print_actions (FILE *out, state *s)
+{
+  /* Print shifts.  */
+  print_transitions (s, out, true);
+  print_errs (out, s);
+  print_reductions (out, s);
+  /* Print gotos.  */
+  print_transitions (s, out, false);
 }
 
+
+/*----------------------------------.
+| Report all the data on S on OUT.  |
+`----------------------------------*/
+
 static void
-print_state (FILE *out, int state)
+print_state (FILE *out, state *s)
 {
-  fprintf (out, _("state %d"), state);
-  fputs ("\n\n", out);
-  print_core (out, state);
-  print_actions (out, state);
   fputs ("\n\n", out);
+  fprintf (out, _("state %d"), s->number);
+  fputc ('\n', out);
+  print_core (out, s);
+  print_actions (out, s);
+  if ((report_flag & report_solved_conflicts) && s->solved_conflicts)
+    {
+      fputc ('\n', out);
+      fputs (s->solved_conflicts, out);
+    }
 }
 
 /*-----------------------------------------.
@@ -202,50 +399,33 @@ do {						\
 static void
 print_grammar (FILE *out)
 {
-  int i, j;
-  short *rule;
+  symbol_number 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 (rule_table[i].useful)
-      {
-	fprintf (out, _("  %3d %3d %s ->"),
-		 i, rule_table[i].line, tags[rule_table[i].lhs]);
-	rule = &ritem[rule_table[i].rhs];
-	if (*rule > 0)
-	  while (*rule > 0)
-	    fprintf (out, " %s", tags[*rule++]);
-	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"));
-  fprintf (out, "%s (-1)\n", tags[0]);
-
-  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 = symbols[token_translations[i]]->tag;
+	rule_number r;
+	item_number *rhsp;
+
 	buffer[0] = 0;
-	column = strlen (tags[token_translations[i]]);
-	fputs (tags[token_translations[i]], out);
-	END_TEST (50);
+	column = strlen (tag);
+	fputs (tag, out);
+	END_TEST (65);
 	sprintf (buffer, " (%d)", i);
 
-	for (j = 1; j <= nrules; j++)
-	  for (rule = &ritem[rule_table[j].rhs]; *rule > 0; rule++)
-	    if (*rule == token_translations[i])
+	for (r = 0; r < nrules; 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);
+		sprintf (buffer + strlen (buffer), " %d", r);
 		break;
 	      }
 	fprintf (out, "%s\n", buffer);
@@ -254,16 +434,19 @@ 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 r;
+      const char *tag = symbols[i]->tag;
 
-      for (j = 1; j <= nrules; j++)
+      for (r = 0; r < nrules; r++)
 	{
-	  if (rule_table[j].lhs == i)
+	  item_number *rhsp;
+	  if (rules[r].lhs->number == i)
 	    left_count++;
-	  for (rule = &ritem[rule_table[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;
@@ -271,21 +454,23 @@ print_grammar (FILE *out)
 	}
 
       buffer[0] = 0;
-      fputs (tags[i], out);
-      column = strlen (tags[i]);
+      fputs (tag, out);
+      column = strlen (tag);
       sprintf (buffer, " (%d)", i);
       END_TEST (0);
 
       if (left_count > 0)
 	{
-	  END_TEST (50);
+	  END_TEST (65);
 	  sprintf (buffer + strlen (buffer), _(" on left:"));
 
-	  for (j = 1; j <= nrules; j++)
+	  for (r = 0; r < nrules; r++)
 	    {
-	      END_TEST (65);
-	      if (rule_table[j].lhs == i)
-		sprintf (buffer + strlen (buffer), " %d", j);
+	      if (rules[r].lhs->number == i)
+		{
+		  END_TEST (65);
+		  sprintf (buffer + strlen (buffer), " %d", r);
+		}
 	    }
 	}
 
@@ -293,56 +478,52 @@ print_grammar (FILE *out)
 	{
 	  if (left_count > 0)
 	    sprintf (buffer + strlen (buffer), ",");
-	  END_TEST (50);
+	  END_TEST (65);
 	  sprintf (buffer + strlen (buffer), _(" on right:"));
-	  for (j = 1; j <= nrules; j++)
+	  for (r = 0; r < nrules; r++)
 	    {
-	      for (rule = &ritem[rule_table[j].rhs]; *rule > 0; rule++)
-		if (*rule == i)
+	      item_number *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);
+		    sprintf (buffer + strlen (buffer), " %d", r);
 		    break;
 		  }
 	    }
 	}
       fprintf (out, "%s\n", buffer);
     }
-  fputs ("\n\n", out);
 }
 
 void
 print_results (void)
 {
-  if (verbose_flag)
-    {
-      int 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);
-      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)
-	new_closure (nitems);
-      for (i = 0; i < nstates; i++)
-	print_state (out, i);
-      if (trace_flag)
-	free_closure ();
-
-      xfclose (out);
-    }
-  obstack_free (&output_obstack, NULL);
+  state_number 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");
+
+  reduce_output (out);
+  grammar_rules_partial_print (out,
+			       _("Rules useless in parser due to conflicts"),
+                                 rule_useless_in_parser_p);
+  conflicts_output (out);
+
+  print_grammar (out);
+
+  /* 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.  */
+  no_reduce_set =  bitset_create (ntokens, BITSET_FIXED);
+  for (i = 0; i < nstates; i++)
+    print_state (out, states[i]);
+  bitset_free (no_reduce_set);
+  if (report_flag & report_itemsets)
+    free_closure ();
+
+  xfclose (out);
 }