X-Git-Url: https://git.saurik.com/bison.git/blobdiff_plain/72a23c9797290f1f2c948cf3027d80fa5c9370bc..e91ff6ce3d2653b41265591dafd4bdb32ae114c2:/src/reduce.c

diff --git a/src/reduce.c b/src/reduce.c
index 2b322726..61ad2b2e 100644
--- a/src/reduce.c
+++ b/src/reduce.c
@@ -37,9 +37,6 @@
 #include "getargs.h"
 #include "bitset.h"
 
-typedef short *rule;
-
-
 /* Set of all nonterminals which are not useless.  */
 static bitset N;
 
@@ -54,7 +51,7 @@ static bitset V;
 static bitset V1;
 
 static int nuseful_productions;
-static int nuseless_productions;
+int nuseless_productions;
 static int nuseful_nonterminals;
 int nuseless_nonterminals;
 
@@ -67,7 +64,7 @@ int nuseless_nonterminals;
 static bool
 useful_production (int i, bitset N0)
 {
-  rule r;
+  item_number_t *r;
   short n;
 
   /* A production is useful if all of the nonterminals in its appear
@@ -139,7 +136,7 @@ inaccessable_symbols (void)
   bitset Vp, Vs, Pp;
   int i;
   short t;
-  rule r;
+  item_number_t *r;
 
   /* Find out which productions are reachable and which symbols are
      used.  Starting with an empty set of productions and a set of
@@ -252,7 +249,7 @@ reduce_grammar_tables (void)
     /* Renumber the rules markers in RITEMS.  */
     for (i = 1; i < nrules + 1; ++i)
       {
-	short *rhsp = rules[i].rhs;
+	item_number_t *rhsp = rules[i].rhs;
 	for (/* Nothing. */; *rhsp >= 0; ++rhsp)
 	  /* Nothing. */;
 	*rhsp = -i;
@@ -269,7 +266,6 @@ reduce_grammar_tables (void)
       {
 	length = rule_rhs_length (&rules[r]);
 	nritems -= length + 1;
-	nitems -= length + 1;
       }
   }
 }
@@ -282,12 +278,12 @@ reduce_grammar_tables (void)
 static void
 nonterminals_reduce (void)
 {
-  int i, n;
+  token_number_t i, n;
 
   /* Map the nonterminals to their new index: useful first, useless
      afterwards.  Kept for later report.  */
 
-  short *nontermmap = XCALLOC (short, nvars) - ntokens;
+  token_number_t *nontermmap = XCALLOC (token_number_t, nvars) - ntokens;
   n = ntokens;
   for (i = ntokens; i < nsyms; i++)
     if (bitset_test (V, i))
@@ -299,7 +295,7 @@ nonterminals_reduce (void)
 
   /* Shuffle elements of tables indexed by symbol number.  */
   {
-    bucket **symbols_sorted = XMALLOC (bucket *, nvars) - ntokens;
+    symbol_t **symbols_sorted = XMALLOC (symbol_t *, nvars) - ntokens;
 
     for (i = ntokens; i < nsyms; i++)
       symbols[i]->number = nontermmap[i];
@@ -312,7 +308,7 @@ nonterminals_reduce (void)
 
   for (i = 0; i < nritems; ++i)
     if (ISVAR (ritem[i]))
-      ritem[i] = nontermmap[ritem[i]];
+      ritem[i] = token_number_as_item_number (nontermmap[ritem[i]]);
 
   start_symbol = nontermmap[start_symbol];
 
@@ -362,7 +358,7 @@ reduce_output (FILE *out)
       fprintf (out, "%s\n\n", _("Useless rules:"));
       for (i = nrules + 1; i < nuseless_productions + nrules + 1; i++)
 	{
-	  rule r;
+	  item_number_t *r;
 	  fprintf (out, "#%-4d  ", rules[i].user_number - 1);
 	  fprintf (out, "%s:", quotearg_style (escape_quoting_style,
 					       rules[i].lhs->tag));
@@ -375,58 +371,7 @@ reduce_output (FILE *out)
     }
 }
 
-static void
-dump_grammar (FILE *out)
-{
-  int i;
-  rule r;
-
-  fprintf (out, "REDUCED GRAMMAR\n\n");
-  fprintf (out,
-	   "ntokens = %d, nvars = %d, nsyms = %d, nrules = %d, nitems = %d\n\n",
-	   ntokens, nvars, nsyms, nrules, nitems);
-  fprintf (out, "Variables\n---------\n\n");
-  fprintf (out, "Value  Sprec  Sassoc  Tag\n");
-  for (i = ntokens; i < nsyms; i++)
-    fprintf (out, "%5d  %5d   %5d  %s\n",
-	     i,
-	     symbols[i]->prec, symbols[i]->assoc,
-	     quotearg_style (escape_quoting_style, symbols[i]->tag));
-  fprintf (out, "\n\n");
-  fprintf (out, "Rules\n-----\n\n");
-  fprintf (out, "Num (Prec, Assoc, Useful, Ritem Range) Lhs -> Rhs (Ritem range) [Num]\n");
-  for (i = 1; i < nrules + nuseless_productions + 1; i++)
-    {
-      int rhs_count = 0;
-      /* Find the last RHS index in ritems. */
-      for (r = rules[i].rhs; *r >= 0; ++r)
-	++rhs_count;
-      fprintf (out, "%3d (%2d, %2d, %2d, %2d-%2d)   %2d ->",
-	       i - 1,
-	       rules[i].prec->prec,
-	       rules[i].prec->assoc,
-	       rules[i].useful,
-	       rules[i].rhs - ritem,
-	       rules[i].rhs - ritem + rhs_count - 1,
-	       rules[i].lhs->number);
-      /* Dumped the RHS. */
-      for (r = rules[i].rhs; *r >= 0; r++)
-	fprintf (out, "%3d", *r);
-      fprintf (out, "  [%d]\n", -(*r) - 1);
-    }
-  fprintf (out, "\n\n");
-  fprintf (out, "Rules interpreted\n-----------------\n\n");
-  for (i = 1; i < nrules + nuseless_productions + 1; i++)
-    {
-      fprintf (out, "%-5d  %s :",
-	       i, quotearg_style (escape_quoting_style, rules[i].lhs->tag));
-      for (r = rules[i].rhs; *r >= 0; r++)
-	fprintf (out, " %s",
-		 quotearg_style (escape_quoting_style, symbols[*r]->tag));
-      fputc ('\n', out);
-    }
-  fprintf (out, "\n\n");
-}
+
 
 
 
@@ -488,14 +433,17 @@ reduce_grammar (void)
     fatal (_("Start symbol %s does not derive any sentence"),
 	   quotearg_style (escape_quoting_style, symbols[start_symbol]->tag));
 
-  if (nuseless_productions > 0)
-    reduce_grammar_tables ();
+  /* First reduce the nonterminals, as they renumber themselves in the
+     whole grammar.  If you change the order, nonterms would be
+     renumbered only in the reduced grammar.  */
   if (nuseless_nonterminals > 0)
     nonterminals_reduce ();
+  if (nuseless_productions > 0)
+    reduce_grammar_tables ();
 
   if (trace_flag)
     {
-      dump_grammar (stderr);
+      grammar_dump (stderr, "Reduced Grammar");
 
       fprintf (stderr, "reduced %s defines %d terminals, %d nonterminals\
 , and %d productions.\n",