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[bison.git] / src / nullable.c

diff --git a/src/nullable.c b/src/nullable.c
index 42e398b34624b92f865f1ba86019bd5385ef30ca..c0b60f64d40235e653e2f9b7033030341d0d0580 100644 (file)
--- a/src/nullable.c
+++ b/src/nullable.c
@@ -1,5 +1,5 @@
 /* Part of the bison parser generator,
 /* Part of the bison parser generator,

-   Copyright 1984, 1989, 2000, 2001 Free Software Foundation, Inc.
+   Copyright (C) 1984, 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.
 


@@ -26,12 +26,18 @@
 #include "system.h"
 #include "getargs.h"
 #include "symtab.h"
 #include "system.h"
 #include "getargs.h"
 #include "symtab.h"

-#include "types.h"

 #include "gram.h"
 #include "reduce.h"
 #include "nullable.h"
 
 #include "gram.h"
 #include "reduce.h"
 #include "nullable.h"
 

-char *nullable = NULL;
+/* Linked list of rules.  */
+typedef struct rule_list_s
+{
+  struct rule_list_s *next;
+  rule_t *value;
+} rule_list_t;
+
+bool *nullable = NULL;

 
 static void
 nullable_print (FILE *out)
 
 static void
 nullable_print (FILE *out)


@@ -44,50 +50,48 @@ nullable_print (FILE *out)
 }
 
 void
 }
 
 void

-set_nullable (void)
+nullable_compute (void)

 {
 {

-  int ruleno;
+  rule_number_t ruleno;

   symbol_number_t *s1;
   symbol_number_t *s2;
   symbol_number_t *s1;
   symbol_number_t *s2;

-  shorts *p;
+  rule_list_t *p;

 
   symbol_number_t *squeue = XCALLOC (symbol_number_t, nvars);
 
   symbol_number_t *squeue = XCALLOC (symbol_number_t, nvars);

-  short *rcount = XCALLOC (short, nrules + 1);
+  short *rcount = XCALLOC (short, nrules);

   /* RITEM contains all the rules, including useless productions.
      Hence we must allocate room for useless nonterminals too.  */
   /* RITEM contains all the rules, including useless productions.
      Hence we must allocate room for useless nonterminals too.  */

-  shorts **rsets = XCALLOC (shorts *, nvars) - ntokens;
+  rule_list_t **rsets = XCALLOC (rule_list_t *, nvars) - ntokens;

   /* This is said to be more elements than we actually use.
      Supposedly NRITEMS - NRULES is enough.  But why take the risk?  */
   /* This is said to be more elements than we actually use.
      Supposedly NRITEMS - NRULES is enough.  But why take the risk?  */

-  shorts *relts = XCALLOC (shorts, nritems + nvars + 1);
-
-  if (trace_flag)
-    fprintf (stderr, "Entering set_nullable\n");
+  rule_list_t *relts = XCALLOC (rule_list_t, nritems + nvars + 1);

 
 

-  nullable = XCALLOC (char, nvars) - ntokens;
+  nullable = XCALLOC (bool, nvars) - ntokens;

 
   s1 = s2 = squeue;
   p = relts;
 
 
   s1 = s2 = squeue;
   p = relts;
 

-  for (ruleno = 1; ruleno < nrules + 1; ++ruleno)
+  for (ruleno = 0; ruleno < nrules; ++ruleno)

     if (rules[ruleno].useful)
       {
     if (rules[ruleno].useful)
       {

-       if (rules[ruleno].rhs[0] >= 0)
+       rule_t *rule = &rules[ruleno];
+       if (rule->rhs[0] >= 0)

          {
            /* This rule has a non empty RHS. */
          {
            /* This rule has a non empty RHS. */

-           item_number_t *r;
+           item_number_t *r = NULL;

            int any_tokens = 0;
            int any_tokens = 0;

-           for (r = rules[ruleno].rhs; *r >= 0; ++r)
+           for (r = rule->rhs; *r >= 0; ++r)

              if (ISTOKEN (*r))
                any_tokens = 1;
 
            /* This rule has only nonterminals: schedule it for the second
               pass.  */
            if (!any_tokens)
              if (ISTOKEN (*r))
                any_tokens = 1;
 
            /* This rule has only nonterminals: schedule it for the second
               pass.  */
            if (!any_tokens)

-             for (r = rules[ruleno].rhs; *r >= 0; ++r)
+             for (r = rule->rhs; *r >= 0; ++r)

                {
                  rcount[ruleno]++;
                  p->next = rsets[*r];
                {
                  rcount[ruleno]++;
                  p->next = rsets[*r];

-                 p->value = ruleno;
+                 p->value = rule;

                  rsets[*r] = p;
                  p++;
                }
                  rsets[*r] = p;
                  p++;
                }


@@ -95,11 +99,11 @@ set_nullable (void)
        else
          {
            /* This rule has an empty RHS. */
        else
          {
            /* This rule has an empty RHS. */

-           assert (rules[ruleno].rhs[0] == -ruleno);
-           if (rules[ruleno].useful && !nullable[rules[ruleno].lhs->number])
+           assert (item_number_as_rule_number (rule->rhs[0]) == ruleno);
+           if (rule->useful && !nullable[rule->lhs->number])

              {
              {

-               nullable[rules[ruleno].lhs->number] = 1;
-               *s2++ = rules[ruleno].lhs->number;
+               nullable[rule->lhs->number] = 1;
+               *s2++ = rule->lhs->number;

              }
          }
       }
              }
          }
       }


@@ -107,12 +111,12 @@ set_nullable (void)
   while (s1 < s2)
     for (p = rsets[*s1++]; p; p = p->next)
       {
   while (s1 < s2)
     for (p = rsets[*s1++]; p; p = p->next)
       {

-       ruleno = p->value;
-       if (--rcount[ruleno] == 0)
-         if (rules[ruleno].useful && !nullable[rules[ruleno].lhs->number])
+       rule_t *rule = p->value;
+       if (--rcount[rule->number] == 0)
+         if (rule->useful && !nullable[rule->lhs->number])

            {
            {

-             nullable[rules[ruleno].lhs->number] = 1;
-             *s2++ = rules[ruleno].lhs->number;
+             nullable[rule->lhs->number] = 1;
+             *s2++ = rule->lhs->number;

            }
       }
 
            }
       }
 


@@ -121,13 +125,13 @@ set_nullable (void)
   XFREE (rsets + ntokens);
   XFREE (relts);
 
   XFREE (rsets + ntokens);
   XFREE (relts);
 

-  if (trace_flag)
+  if (trace_flag & trace_sets)

     nullable_print (stderr);
 }
 
 
 void
     nullable_print (stderr);
 }
 
 
 void

-free_nullable (void)
+nullable_free (void)

 {
   XFREE (nullable + ntokens);
 }
 {
   XFREE (nullable + ntokens);
 }