Officially drop support for building Bison with K&R C,

[bison.git] / src / print.c

diff --git a/src/print.c b/src/print.c
index d9f38ca9f355a0ad2d27fb58815adeb01600017e..6e11dfb56e5c5494fbbd304d4fa051026816e14c 100644 (file)
--- a/src/print.c
+++ b/src/print.c
@@ -1,5 +1,6 @@
 /* Print information on generated parser, for bison,
 /* Print information on generated parser, for bison,

-   Copyright 1984, 1986, 1989, 2000 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.
 
 
    This file is part of Bison, the GNU Compiler Compiler.
 


@@ -20,7 +21,9 @@
 
 
 #include "system.h"
 
 
 #include "system.h"

+#include "quotearg.h"

 #include "files.h"
 #include "files.h"

+#include "symtab.h"

 #include "gram.h"
 #include "LR0.h"
 #include "lalr.h"
 #include "gram.h"
 #include "LR0.h"
 #include "lalr.h"


@@ -29,6 +32,12 @@
 #include "state.h"
 #include "reader.h"
 #include "print.h"
 #include "state.h"
 #include "reader.h"
 #include "print.h"

+#include "reduce.h"
+#include "closure.h"
+#include "bitset.h"
+
+static bitset shiftset;
+static bitset lookaheadset;

 
 #if 0
 static void
 
 #if 0
 static void


@@ -39,167 +48,384 @@ print_token (int extnum, int token)
 #endif
 
 \f
 #endif
 
 \f

+
+/*---------------------------------------.
+| *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
 /*--------------------------------.
 | Report information on a state.  |
 `--------------------------------*/
 
 static void

-print_core (FILE *out, int state)
+print_core (FILE *out, state_t *state)

 {
   int i;
 {
   int i;

-  int k;
-  int rule;
-  core *statep;
-  short *sp;
-  short *sp1;
+  item_number_t *sitems = state->items;
+  int snritems   = state->nitems;
+  symbol_t *previous_lhs = NULL;

 
 

-  statep = state_table[state];
-  k = statep->nitems;
+  /* Output all the items of a state, not only its kernel.  */
+  if (report_flag & report_itemsets)
+    {
+      closure (sitems, snritems);
+      sitems = itemset;
+      snritems = nritemset;
+    }

 
 

-  if (k == 0)
+  if (!snritems)

     return;
 
     return;
 

-  for (i = 0; i < k; i++)
+  fputc ('\n', out);
+
+  for (i = 0; i < snritems; i++)

     {
     {

-      sp1 = sp = ritem + statep->items[i];
+      item_number_t *sp;
+      item_number_t *sp1;
+      int rule;
+
+      sp1 = sp = ritem + sitems[i];

 
 

-      while (*sp > 0)
+      while (*sp >= 0)

        sp++;
 
        sp++;
 

-      rule = -(*sp);
-      fprintf (out, "    %s  ->  ", tags[rlhs[rule]]);
+      rule = item_number_as_rule_number (*sp);

 
 

-      for (sp = ritem + rrhs[rule]; sp < sp1; sp++)
-       {
-         fprintf (out, "%s ", tags[*sp]);
-       }
+      rule_lhs_print (&rules[rule], previous_lhs, out);
+      previous_lhs = rules[rule].lhs;

 
 

-      fputc ('.', out);
+      for (sp = rules[rule].rhs; sp < sp1; sp++)
+       fprintf (out, " %s", symbols[*sp]->tag);
+      fputs (" .", out);
+      for (/* Nothing */; *sp >= 0; ++sp)
+       fprintf (out, " %s", symbols[*sp]->tag);

 
 

-      while (*sp > 0)
-       {
-         fprintf (out, " %s", tags[*sp]);
-         sp++;
-       }
+      /* Display the lookaheads?  */
+      if (report_flag & report_lookaheads)
+       state_rule_lookaheads_print (state, &rules[rule], out);

 
 

-      fprintf (out, _("   (rule %d)"), rule);

       fputc ('\n', out);
     }
       fputc ('\n', out);
     }

+}
+
+
+/*----------------------------------------------------------------.
+| Report the shifts iff DISPLAY_SHIFTS_P or the gotos of STATE on |
+| OUT.                                                            |
+`----------------------------------------------------------------*/
+
+static void
+print_transitions (state_t *state, FILE *out, bool display_transitions_p)
+{
+  transitions_t *transitions = state->transitions;
+  size_t width = 0;
+  int i;
+
+  /* Compute the width of the lookaheads column.  */
+  for (i = 0; i < transitions->num; i++)
+    if (!TRANSITION_IS_DISABLED (transitions, i)
+       && TRANSITION_IS_SHIFT (transitions, i) == display_transitions_p)
+      {
+       symbol_t *symbol = symbols[TRANSITION_SYMBOL (transitions, i)];
+       max_length (&width, symbol->tag);
+      }
+
+  /* Nothing to report. */
+  if (!width)
+    return;

 
   fputc ('\n', out);
 
   fputc ('\n', out);

+  width += 2;
+
+  /* Report lookaheads and shifts.  */
+  for (i = 0; i < transitions->num; i++)
+    if (!TRANSITION_IS_DISABLED (transitions, i)
+       && TRANSITION_IS_SHIFT (transitions, i) == display_transitions_p)
+      {
+       symbol_t *symbol = symbols[TRANSITION_SYMBOL (transitions, i)];
+       const char *tag = symbol->tag;
+       state_t *state1 = transitions->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"), state1->number);
+       else
+         fprintf (out, _("go to state %d\n"), state1->number);
+      }

 }
 
 }
 

+
+/*------------------------------------------------------------.
+| Report the explicit errors of STATE raised from %nonassoc.  |
+`------------------------------------------------------------*/
+

 static void
 static void

-print_actions (FILE *out, int state)
+print_errs (FILE *out, state_t *state)

 {
 {

+  errs_t *errp = state->errs;
+  size_t width = 0;
+  int i;
+
+  /* Compute the width of the lookaheads 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 lookaheads 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);
+      }
+}
+
+
+/*----------------------------------------------------------.
+| Return the default rule of this STATE if it has one, NULL |
+| otherwise.                                                |
+`----------------------------------------------------------*/
+
+static rule_t *
+state_default_rule (state_t *state)
+{
+  reductions_t *redp = state->reductions;
+  rule_t *default_rule = NULL;
+  int cmax = 0;

   int i;
   int i;

-  int k;
-  int state1;
-  int symbol;
-  shifts *shiftp;
-  errs *errp;
-  reductions *redp;
-  int rule;
-
-  shiftp = shift_table[state];
-  redp = reduction_table[state];
-  errp = err_table[state];
-
-  if (!shiftp && !redp)
-    {
-      if (final_state == state)
-       fprintf (out, _("    $default\taccept\n"));
-      else
-       fprintf (out, _("    NO ACTIONS\n"));
-      return;
-    }

 
 

-  if (shiftp)
+  /* No need for a lookahead.  */
+  if (state->consistent)
+    return redp->rules[0];
+
+  /* 1. Each reduction is possibly masked by the lookaheads on which
+     we shift (S/R conflicts)...  */
+  bitset_zero (shiftset);
+  {
+    transitions_t *transitions = state->transitions;
+    FOR_EACH_SHIFT (transitions, i)
+      {
+       /* If this state has a shift for the error token, don't use a
+            default rule.  */
+       if (TRANSITION_IS_ERROR (transitions, i))
+         return NULL;
+       bitset_set (shiftset, TRANSITION_SYMBOL (transitions, 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->num; i++)
+      if (errp->symbols[i])
+       bitset_set (shiftset, errp->symbols[i]->number);
+  }
+
+  for (i = 0; i < redp->num; ++i)

     {
     {

-      k = shiftp->nshifts;
+      int count = 0;
+
+      /* How many non-masked lookaheads are there for this reduction?
+        */
+      bitset_andn (lookaheadset, redp->lookaheads[i], shiftset);
+      count = bitset_count (lookaheadset);

 
 

-      for (i = 0; i < k; i++)
+      if (count > cmax)

        {
        {

-         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 (out,
-                    _("    $   \tgo to state %d\n"), state1);
-         else
-           fprintf (out,
-                    _("    %-4s\tshift, and go to state %d\n"),
-                    tags[symbol], state1);
+         cmax = count;
+         default_rule = redp->rules[i];

        }
 
        }
 

-      if (i > 0)
-       fputc ('\n', out);
+      /* 3. And finally, each reduction is possibly masked by previous
+        reductions (in R/R conflicts, we keep the first reductions).
+        */
+      bitset_or (shiftset, shiftset, redp->lookaheads[i]);

     }
     }

+
+  return default_rule;
+}
+
+
+/*--------------------------------------------------------------------.
+| Report a reduction of RULE on LOOKAHEADS (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,
+                rule_t *rule, bool enabled)
+{
+  int j;
+  fprintf (out, "    %s", lookahead);
+  for (j = width - strlen (lookahead); j > 0; --j)
+    fputc (' ', out);
+  if (!enabled)
+    fputc ('[', out);
+  if (rule->number)
+    fprintf (out, _("reduce using rule %d (%s)"),
+            rule->number, rule->lhs->tag);

   else
   else

-    {
-      i = 0;
-      k = 0;
-    }
+    fprintf (out, _("accept"));
+  if (!enabled)
+    fputc (']', out);
+  fputc ('\n', out);
+}

 
 

-  if (errp)
-    {
-      int j, nerrs;

 
 

-      nerrs = errp->nerrs;
+/*----------------------------------------------------.
+| Report on OUT the reduction actions of this STATE.  |
+`----------------------------------------------------*/

 
 

-      for (j = 0; j < nerrs; j++)
-       {
-         if (!errp->errs[j])
-           continue;
-         symbol = errp->errs[j];
-         fprintf (out, _("    %-4s\terror (nonassociative)\n"),
-                  tags[symbol]);
-       }
+static void
+print_reductions (FILE *out, state_t *state)
+{
+  transitions_t *transitions = state->transitions;
+  reductions_t *redp = state->reductions;
+  rule_t *default_rule = NULL;
+  size_t width = 0;
+  int i, j;

 
 

-      if (j > 0)
-       fputc ('\n', out);
-    }
+  if (redp->num == 0)
+    return;

 
 

-  if (consistent[state] && redp)
-    {
-      rule = redp->rules[0];
-      symbol = rlhs[rule];
-      fprintf (out, _("    $default\treduce using rule %d (%s)\n\n"),
-              rule, tags[symbol]);
-    }
-  else if (redp)
-    {
-      print_reductions (out, state);
-    }
+  default_rule = state_default_rule (state);

 
 

-  if (i < k)
-    {
-      for (; i < k; i++)
-       {
-         if (!shiftp->shifts[i])
-           continue;
-         state1 = shiftp->shifts[i];
-         symbol = accessing_symbol[state1];
-         fprintf (out, _("    %-4s\tgo to state %d\n"),
-                  tags[symbol], state1);
-       }
+  bitset_zero (shiftset);
+  FOR_EACH_SHIFT (transitions, i)
+    bitset_set (shiftset, TRANSITION_SYMBOL (transitions, i));

 
 

-      fputc ('\n', out);
-    }
+  /* Compute the width of the lookaheads column.  */
+  if (default_rule)
+    width = strlen (_("$default"));
+
+  if (redp->lookaheads)
+    for (i = 0; i < ntokens; i++)
+      {
+       int count = bitset_test (shiftset, i);
+
+       for (j = 0; j < redp->num; ++j)
+         if (bitset_test (redp->lookaheads[j], i))
+           {
+             if (count == 0)
+               {
+                 if (redp->rules[j] != default_rule)
+                   max_length (&width, symbols[i]->tag);
+                 count++;
+               }
+             else
+               {
+                 max_length (&width, symbols[i]->tag);
+               }
+           }
+      }
+
+  /* Nothing to report. */
+  if (!width)
+    return;
+
+  fputc ('\n', out);
+  width += 2;
+
+  /* Report lookaheads (or $default) and reductions.  */
+  if (redp->lookaheads)
+    for (i = 0; i < ntokens; i++)
+      {
+       int defaulted = 0;
+       int count = bitset_test (shiftset, i);
+
+       for (j = 0; j < redp->num; ++j)
+         if (bitset_test (redp->lookaheads[j], i))
+           {
+             if (count == 0)
+               {
+                 if (redp->rules[j] != default_rule)
+                   print_reduction (out, width,
+                                    symbols[i]->tag,
+                                    redp->rules[j], TRUE);
+                 else
+                   defaulted = 1;
+                 count++;
+               }
+             else
+               {
+                 if (defaulted)
+                   print_reduction (out, width,
+                                    symbols[i]->tag,
+                                    default_rule, TRUE);
+                 defaulted = 0;
+                 print_reduction (out, width,
+                                  symbols[i]->tag,
+                                  redp->rules[j], FALSE);
+               }
+           }
+      }
+
+  if (default_rule)
+    print_reduction (out, width,
+                    _("$default"), default_rule, TRUE);

 }
 
 }
 

+
+/*--------------------------------------------------------------.
+| Report on OUT all the actions (shifts, gotos, reductions, and |
+| explicit erros from %nonassoc) of STATE.                      |
+`--------------------------------------------------------------*/
+

 static void
 static void

-print_state (FILE *out, int state)
+print_actions (FILE *out, state_t *state)
+{
+  /* Print shifts.  */
+  print_transitions (state, out, TRUE);
+  print_errs (out, state);
+  print_reductions (out, state);
+  /* Print gotos.  */
+  print_transitions (state, out, FALSE);
+}
+
+
+/*--------------------------------------.
+| Report all the data on STATE on OUT.  |
+`--------------------------------------*/
+
+static void
+print_state (FILE *out, state_t *state)

 {
   fputs ("\n\n", out);
 {
   fputs ("\n\n", out);

-  fprintf (out, _("state %d"), state);
-  fputs ("\n\n", out);
+  fprintf (out, _("state %d"), state->number);
+  fputc ('\n', out);

   print_core (out, state);
   print_actions (out, state);
   print_core (out, state);
   print_actions (out, state);

+  if ((report_flag & report_solved_conflicts)
+      && state->solved_conflicts)
+    {
+      fputc ('\n', out);
+      fputs (state->solved_conflicts, out);
+    }

 }
 \f
 /*-----------------------------------------.
 }
 \f
 /*-----------------------------------------.


@@ -220,63 +446,54 @@ do {                                              \
 static void
 print_grammar (FILE *out)
 {
 static void
 print_grammar (FILE *out)
 {

-  int i, j;
-  short *rule;
+  symbol_number_t i;

   char buffer[90];
   int column = 0;
 
   char buffer[90];
   int column = 0;
 

-  /* rule # : LHS -> RHS */
-  fprintf (out, "\n%s\n\n", _("Grammar"));
-  for (i = 1; i <= nrules; i++)
-    /* Don't print rules disabled in reduce_grammar_tables.  */
-    if (rlhs[i] >= 0)
-      {
-       fprintf (out, _("rule %-4d %s ->"), i, tags[rlhs[i]]);
-       rule = &ritem[rrhs[i]];
-       if (*rule > 0)
-         while (*rule > 0)
-           fprintf (out, " %s", tags[*rule++]);
-       else
-         fprintf (out, "               /* %s */", _("empty"));
-       fputc ('\n', out);
-      }
+  grammar_rules_print (out);

 
   /* TERMINAL (type #) : rule #s terminal is on RHS */
 
   /* TERMINAL (type #) : rule #s terminal is on RHS */

-  fprintf (out, "\n%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)
+  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_t r;
+       item_number_t *rhsp;
+

        buffer[0] = 0;
        buffer[0] = 0;

-       column = strlen (tags[token_translations[i]]);
-       fputs (tags[token_translations[i]], out);
+       column = strlen (tag);
+       fputs (tag, out);

        END_TEST (50);
        sprintf (buffer, " (%d)", 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])
+       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);
              {
                END_TEST (65);

-               sprintf (buffer + strlen (buffer), " %d", j);
+               sprintf (buffer + strlen (buffer), " %d", r);

                break;
              }
        fprintf (out, "%s\n", buffer);
       }
                break;
              }
        fprintf (out, "%s\n", buffer);
       }

+  fputs ("\n\n", out);
+

 
 

-  fprintf (out, "\n%s\n\n",
-          _("Nonterminals, with rules where they appear"));
-  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;
     {
       int left_count = 0, right_count = 0;

+      rule_number_t 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_t *rhsp;
+         if (rules[r].lhs->number == i)

            left_count++;
            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;
              {
                right_count++;
                break;


@@ -284,8 +501,8 @@ print_grammar (FILE *out)
        }
 
       buffer[0] = 0;
        }
 
       buffer[0] = 0;

-      fputs (tags[i], out);
-      column = strlen (tags[i]);
+      fputs (tag, out);
+      column = strlen (tag);

       sprintf (buffer, " (%d)", i);
       END_TEST (0);
 
       sprintf (buffer, " (%d)", i);
       END_TEST (0);
 


@@ -294,11 +511,11 @@ print_grammar (FILE *out)
          END_TEST (50);
          sprintf (buffer + strlen (buffer), _(" on left:"));
 
          END_TEST (50);
          sprintf (buffer + strlen (buffer), _(" on left:"));
 

-         for (j = 1; j <= nrules; j++)
+         for (r = 0; r < nrules; r++)

            {
              END_TEST (65);
            {
              END_TEST (65);

-             if (rlhs[j] == i)
-               sprintf (buffer + strlen (buffer), " %d", j);
+             if (rules[r].lhs->number == i)
+               sprintf (buffer + strlen (buffer), " %d", r);

            }
        }
 
            }
        }
 


@@ -308,13 +525,14 @@ print_grammar (FILE *out)
            sprintf (buffer + strlen (buffer), ",");
          END_TEST (50);
          sprintf (buffer + strlen (buffer), _(" on right:"));
            sprintf (buffer + strlen (buffer), ",");
          END_TEST (50);
          sprintf (buffer + strlen (buffer), _(" on right:"));

-         for (j = 1; j <= nrules; j++)
+         for (r = 0; r < nrules; r++)

            {
            {

-             for (rule = &ritem[rrhs[j]]; *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);
                  {
                    END_TEST (65);

-                   sprintf (buffer + strlen (buffer), " %d", j);
+                   sprintf (buffer + strlen (buffer), " %d", r);

                    break;
                  }
            }
                    break;
                  }
            }


@@ -326,25 +544,32 @@ print_grammar (FILE *out)
 void
 print_results (void)
 {
 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);
-
-      conflicts_output (out);
-
-      print_grammar (out);
-
-      for (i = 0; i < nstates; i++)
-       print_state (out, i);
-
-      xfclose (out);
-    }
-  obstack_free (&output_obstack, NULL);
+  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");
+
+  reduce_output (out);
+  grammar_rules_partial_print (out,
+                              _("Rules never reduced"), rule_never_reduced_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.  */
+  shiftset =  bitset_create (ntokens, BITSET_FIXED);
+  lookaheadset = bitset_create (ntokens, BITSET_FIXED);
+  for (i = 0; i < nstates; i++)
+    print_state (out, states[i]);
+  bitset_free (shiftset);
+  bitset_free (lookaheadset);
+  if (report_flag & report_itemsets)
+    free_closure ();
+
+  xfclose (out);

 }
 }