X-Git-Url: https://git.saurik.com/bison.git/blobdiff_plain/e06f0c34427faedc7afbec9554adbffc4c87312e..a26424642b1de2c5e237cd69a54f12b2f430321f:/src/print.c

diff --git a/src/print.c b/src/print.c
index 17a47ab4..cb227aa5 100644
--- a/src/print.c
+++ b/src/print.c
@@ -1,331 +1,452 @@
 /* Print information on generated parser, for bison,
-   Copyright (C) 1984, 1986, 1989 Free Software Foundation, Inc.
 
-This file is part of Bison, the GNU Compiler Compiler.
+   Copyright (C) 1984, 1986, 1989, 2000-2005, 2007, 2009-2012 Free
+   Software Foundation, Inc.
 
-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.
+   This file is part of Bison, the GNU Compiler Compiler.
 
-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.
+   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 3 of the License, or
+   (at your option) any later version.
 
-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.  */
+   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 this program.  If not, see <http://www.gnu.org/licenses/>.  */
 
-#include <stdio.h>
+#include <config.h>
 #include "system.h"
-#include "machine.h"
-#include "new.h"
+
+#include <bitset.h>
+
+#include "LR0.h"
+#include "closure.h"
+#include "conflicts.h"
 #include "files.h"
+#include "getargs.h"
 #include "gram.h"
+#include "lalr.h"
+#include "muscle-tab.h"
+#include "print.h"
+#include "reader.h"
+#include "reduce.h"
 #include "state.h"
+#include "symtab.h"
+#include "tables.h"
+
+static bitset no_reduce_set;
+
+#if 0
+static void
+print_token (int extnum, int token)
+{
+  fprintf (out, _(" type %d is %s\n"), extnum, tags[token]);
+}
+#endif
 
+
 
-extern char **tags;
-extern int nstates;
-extern short *accessing_symbol;
-extern core **state_table;
-extern shifts **shift_table;
-extern errs **err_table;
-extern reductions **reduction_table;
-extern char *consistent;
-extern char any_conflicts;
-extern char *conflicts;
-extern int final_state;
-
-extern void conflict_log();
-extern void verbose_conflict_log();
-extern void print_reductions();
-
-void print_token();
-void print_state();
-void print_core();
-void print_actions();
-void print_grammar();
+/*---------------------------------------.
+| *WIDTH := max (*WIDTH, strlen (STR)).  |
+`---------------------------------------*/
 
-void
-terse()
+static void
+max_length (size_t *width, const char *str)
 {
-  if (any_conflicts)
-    {
-      conflict_log();
-    }
+  size_t len = strlen (str);
+  if (len > *width)
+    *width = len;
 }
 
+/*--------------------------------.
+| Report information on a state.  |
+`--------------------------------*/
 
-void
-verbose()
+static void
+print_core (FILE *out, state *s)
 {
-  register int i;
+  size_t i;
+  item_number *sitems = s->items;
+  size_t snritems = s->nitems;
+  symbol *previous_lhs = NULL;
+
+  /* Output all the items of a state, not only its kernel.  */
+  if (report_flag & report_itemsets)
+    {
+      closure (sitems, snritems);
+      sitems = itemset;
+      snritems = nitemset;
+    }
 
-  if (any_conflicts)
-    verbose_conflict_log();
+  if (!snritems)
+    return;
 
-  print_grammar();
+  fputc ('\n', out);
 
-  for (i = 0; i < nstates; i++)
+  for (i = 0; i < snritems; i++)
     {
-      print_state(i);
+      item_number *sp;
+      item_number *sp1;
+      rule_number r;
+
+      sp1 = sp = ritem + sitems[i];
+
+      while (*sp >= 0)
+	sp++;
+
+      r = item_number_as_rule_number (*sp);
+
+      rule_lhs_print (&rules[r], previous_lhs, out);
+      previous_lhs = rules[r].lhs;
+
+      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);
     }
 }
 
 
-void
-print_token(extnum, token)
-int extnum, token;
+/*------------------------------------------------------------.
+| Report the shifts iff DISPLAY_SHIFTS_P or the gotos of S on |
+| OUT.                                                        |
+`------------------------------------------------------------*/
+
+static void
+print_transitions (state *s, FILE *out, bool display_transitions_p)
 {
-  fprintf(foutput, " type %d is %s\n", extnum, tags[token]);
-}
+  transitions *trans = s->transitions;
+  size_t width = 0;
+  int i;
+
+  /* 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);
+      }
 
+  /* Nothing to report. */
+  if (!width)
+    return;
 
-void
-print_state(state)
-int state;
-{
-  fprintf(foutput, "\n\nstate %d\n\n", state);
-  print_core(state);
-  print_actions(state);
+  fputc ('\n', out);
+  width += 2;
+
+  /* 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)
+      {
+	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, _("go to state %d\n"), s1->number);
+      }
 }
 
 
-void
-print_core(state)
-int state;
+/*--------------------------------------------------------.
+| Report the explicit errors of S raised from %nonassoc.  |
+`--------------------------------------------------------*/
+
+static void
+print_errs (FILE *out, state *s)
 {
-  register int i;
-  register int k;
-  register int rule;
-  register core *statep;
-  register short *sp;
-  register short *sp1;
+  errs *errp = s->errs;
+  size_t width = 0;
+  int i;
 
-  statep = state_table[state];
-  k = statep->nitems;
+  /* 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);
 
-  if (k == 0) return;
+  /* Nothing to report. */
+  if (!width)
+    return;
 
-  for (i = 0; i < k; i++)
-    {
-      sp1 = sp = ritem + statep->items[i];
+  fputc ('\n', out);
+  width += 2;
 
-      while (*sp > 0)
-	sp++;
+  /* 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);
+      }
+}
 
-      rule = -(*sp);
-      fprintf(foutput, "    %s  ->  ", tags[rlhs[rule]]);
 
-      for (sp = ritem + rrhs[rule]; sp < sp1; sp++)
-	{
-	  fprintf(foutput, "%s ", tags[*sp]);
-	}
+/*-------------------------------------------------------------------------.
+| 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).                                                          |
+`-------------------------------------------------------------------------*/
 
-      putc('.', foutput);
+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);
+}
 
-      while (*sp > 0)
-	{
-	  fprintf(foutput, " %s", tags[*sp]);
-	  sp++;
-	}
 
-      fprintf (foutput, "   (rule %d)", rule);
-      putc('\n', foutput);
-    }
+/*-------------------------------------------.
+| Report on OUT the reduction actions of S.  |
+`-------------------------------------------*/
 
-  putc('\n', foutput);
-}
+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;
 
-void
-print_actions(state)
-int state;
-{
-  register int i;
-  register int k;
-  register int state1;
-  register int symbol;
-  register shifts *shiftp;
-  register errs *errp;
-  register reductions *redp;
-  register int rule;
-
-  shiftp = shift_table[state];
-  redp = reduction_table[state];
-  errp = err_table[state];
-
-  if (!shiftp && !redp)
-    {
-      if (final_state == state)
-	fprintf(foutput, "    $default\taccept\n");
-      else
-	fprintf(foutput, "    NO ACTIONS\n");
-      return;
-    }
+  if (yydefact[s->number] != 0)
+    default_reduction = &rules[yydefact[s->number] - 1];
 
-  if (shiftp)
-    {
-      k = shiftp->nshifts;
+  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);
 
-      for (i = 0; i < k; i++)
-	{
-	  if (! shiftp->shifts[i]) continue;
-	  state1 = shiftp->shifts[i];
-	  symbol = accessing_symbol[state1];
-	  /* The following line used to be turned off.  */
-	  if (ISVAR(symbol)) break;
-          if (symbol==0)      /* I.e. strcmp(tags[symbol],"$")==0 */
-            fprintf(foutput, "    $   \tgo to state %d\n", state1);
-          else
-            fprintf(foutput, "    %-4s\tshift, and go to state %d\n",
-                    tags[symbol], state1);
-	}
+  /* Compute the width of the lookahead token column.  */
+  if (default_reduction)
+    width = strlen (_("$default"));
 
-      if (i > 0)
-	putc('\n', foutput);
-    }
-  else
-    {
-      i = 0;
-      k = 0;
-    }
+  if (reds->lookahead_tokens)
+    for (i = 0; i < ntokens; i++)
+      {
+	bool count = bitset_test (no_reduce_set, i);
 
-  if (errp)
-    {
-      int j, nerrs;
+	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);
+		}
+	    }
+      }
 
-      nerrs = errp->nerrs;
+  /* Nothing to report. */
+  if (!width)
+    return;
 
-      for (j = 0; j < nerrs; j++)
-	{
-	  if (! errp->errs[j]) continue;
-	  symbol = errp->errs[j];
-	  fprintf(foutput, "    %-4s\terror (nonassociative)\n", tags[symbol]);
-	}
+  fputc ('\n', out);
+  width += 2;
 
-      if (j > 0)
-	putc('\n', foutput);
-    }
+  /* 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;
 
-  if (consistent[state] && redp)
-    {
-      rule = redp->rules[0];
-      symbol = rlhs[rule];
-      fprintf(foutput, "    $default\treduce using rule %d (%s)\n\n",
-     	        rule, tags[symbol]);
-    }
-  else if (redp)
+	for (j = 0; j < reds->num; ++j)
+	  if (bitset_test (reds->lookahead_tokens[j], i))
+	    {
+	      if (! count)
+		{
+		  if (reds->rules[j] != default_reduction)
+                    {
+                      default_reduction_only = false;
+                      print_reduction (out, width,
+                                       symbols[i]->tag,
+                                       reds->rules[j], true);
+                    }
+		  else
+		    defaulted = true;
+		  count = true;
+		}
+	      else
+		{
+                  default_reduction_only = false;
+		  if (defaulted)
+		    print_reduction (out, width,
+				     symbols[i]->tag,
+				     default_reduction, true);
+		  defaulted = false;
+		  print_reduction (out, width,
+				   symbols[i]->tag,
+				   reds->rules[j], false);
+		}
+	    }
+      }
+
+  if (default_reduction)
     {
-      print_reductions(state);
+      char *default_reductions =
+        muscle_percent_define_get ("lr.default-reductions");
+      print_reduction (out, width, _("$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 < k)
-    {
-      for (; i < k; i++)
-	{
-	  if (! shiftp->shifts[i]) continue;
-	  state1 = shiftp->shifts[i];
-	  symbol = accessing_symbol[state1];
-	  fprintf(foutput, "    %-4s\tgo to state %d\n", tags[symbol], state1);
-	}
 
-      putc('\n', foutput);
-    }
+/*--------------------------------------------------------------.
+| 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);
 }
 
-#define END_TEST(end) \
-  if (column + strlen(buffer) > (end))					 \
-    { fprintf (foutput, "%s\n   ", buffer); column = 3; buffer[0] = 0; } \
-  else
 
-void
-print_grammar()
+/*----------------------------------.
+| Report all the data on S on OUT.  |
+`----------------------------------*/
+
+static void
+print_state (FILE *out, state *s)
 {
-  int i, j;
-  short* rule;
+  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);
+    }
+}
+
+/*-----------------------------------------.
+| Print information on the whole grammar.  |
+`-----------------------------------------*/
+
+#define END_TEST(End)				\
+do {						\
+  if (column + strlen(buffer) > (End))		\
+    {						\
+      fprintf (out, "%s\n   ", buffer);		\
+      column = 3;				\
+      buffer[0] = 0;				\
+    }						\
+} while (0)
+
+
+static void
+print_grammar (FILE *out)
+{
+  symbol_number i;
   char buffer[90];
   int column = 0;
 
-  /* rule # : LHS -> RHS */
-  fputs("\nGrammar\n", foutput);
-  for (i = 1; i <= nrules; i++)
-    /* Don't print rules disabled in reduce_grammar_tables.  */
-    if (rlhs[i] >= 0)
-      {
-	fprintf(foutput, "rule %-4d %s ->", i, tags[rlhs[i]]);
-	rule = &ritem[rrhs[i]];
-	if (*rule > 0)
-	  while (*rule > 0)
-	    fprintf(foutput, " %s", tags[*rule++]);
-	else
-	  fputs ("		/* empty */", foutput);
-	putc('\n', foutput);
-      }
+  grammar_rules_print (out);
 
   /* TERMINAL (type #) : rule #s terminal is on RHS */
-  fputs("\nTerminals, with rules where they appear\n\n", foutput);
-  fprintf(foutput, "%s (-1)\n", tags[0]);
-  if (translations)
-    {
-      for (i = 0; i <= max_user_token_number; i++)
-	if (token_translations[i] != 2)
-	  {
-	    buffer[0] = 0;
-	    column = strlen (tags[token_translations[i]]);
-	    fprintf(foutput, "%s", tags[token_translations[i]]);
-	    END_TEST (50);
-	    sprintf (buffer, " (%d)", i);
-
-	    for (j = 1; j <= nrules; j++)
-	      {
-		for (rule = &ritem[rrhs[j]]; *rule > 0; rule++)
-		  if (*rule == token_translations[i])
-		    {
-		      END_TEST (65);
-		      sprintf (buffer + strlen(buffer), " %d", j);
-		      break;
-		    }
-	      }
-	    fprintf (foutput, "%s\n", buffer);
-	  }
-    }
-  else
-    for (i = 1; i < ntokens; i++)
+  fprintf (out, "%s\n\n", _("Terminals, with rules where they appear"));
+  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[i]);
-	fprintf(foutput, "%s", tags[i]);
-	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[rrhs[j]]; *rule > 0; rule++)
-	      if (*rule == i)
-		{
-		  END_TEST (65);
-		  sprintf (buffer + strlen(buffer), " %d", j);
-		  break;
-		}
-	  }
-	fprintf (foutput, "%s\n", buffer);
+	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", r);
+		break;
+	      }
+	fprintf (out, "%s\n", buffer);
       }
+  fputs ("\n\n", out);
 
-  fputs("\nNonterminals, with rules where they appear\n\n", foutput);
-  for (i = ntokens; i <= nsyms - 1; i++)
+
+  fprintf (out, "%s\n\n", _("Nonterminals, with rules where they appear"));
+  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 (rlhs[j] == i)
+	  item_number *rhsp;
+	  if (rules[r].lhs->number == i)
 	    left_count++;
-	  for (rule = &ritem[rrhs[j]]; *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;
@@ -333,41 +454,76 @@ print_grammar()
 	}
 
       buffer[0] = 0;
-      fprintf(foutput, "%s", tags[i]);
-      column = strlen (tags[i]);
+      fputs (tag, out);
+      column = strlen (tag);
       sprintf (buffer, " (%d)", i);
       END_TEST (0);
 
       if (left_count > 0)
 	{
-	  END_TEST (50);
-	  sprintf (buffer + strlen(buffer), " on left:");
+	  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 (rlhs[j] == i)
-		sprintf (buffer + strlen(buffer), " %d", j);
+	      if (rules[r].lhs->number == i)
+		{
+		  END_TEST (65);
+		  sprintf (buffer + strlen (buffer), " %d", r);
+		}
 	    }
 	}
 
       if (right_count > 0)
 	{
 	  if (left_count > 0)
-	    sprintf (buffer + strlen(buffer), ",");
-	  END_TEST (50);
-	  sprintf (buffer + strlen(buffer), " on right:");
-	  for (j = 1; j <= nrules; j++)
+	    sprintf (buffer + strlen (buffer), ",");
+	  END_TEST (65);
+	  sprintf (buffer + strlen (buffer), _(" on right:"));
+	  for (r = 0; r < nrules; r++)
 	    {
-	      for (rule = &ritem[rrhs[j]]; *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 (foutput, "%s\n", buffer);
+      fprintf (out, "%s\n", buffer);
     }
 }
+
+void
+print_results (void)
+{
+  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);
+}