* src/closure.c (print_firsts, print_fderives, closure):

[bison.git] / src / closure.c

diff --git a/src/closure.c b/src/closure.c
index bb45ba026cae20fe99ed42852bc383c00f28555b..751107744c57dccd95529d76c564f47eeedc56fe 100644 (file)
--- a/src/closure.c
+++ b/src/closure.c
@@ -1,5 +1,5 @@
 /* Subroutines for bison
 /* Subroutines for bison

-   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.
 


@@ -19,32 +19,30 @@
    02111-1307, USA.  */
 
 #include "system.h"
    02111-1307, USA.  */
 
 #include "system.h"

+#include "quotearg.h"
+#include "bitset.h"
+#include "bitsetv.h"
+#include "bitsetv-print.h"

 #include "getargs.h"
 #include "getargs.h"

+#include "symtab.h"

 #include "gram.h"
 #include "reader.h"
 #include "closure.h"
 #include "derives.h"
 #include "gram.h"
 #include "reader.h"
 #include "closure.h"
 #include "derives.h"

-#include "warshall.h"

 
 

-/* ITEMSETSIZE is the size of the array ITEMSET.  */
-short *itemset;
-int itemsetsize;
+/* NITEMSET is the size of the array ITEMSET.  */
+item_number_t *itemset;
+int nritemset;

 
 

-static unsigned *ruleset;
+static bitset ruleset;

 
 /* internal data.  See comments before set_fderives and set_firsts.  */
 
 /* internal data.  See comments before set_fderives and set_firsts.  */

-static unsigned *fderives;
-static unsigned *firsts;
+static bitsetv fderives = NULL;
+static bitsetv firsts = NULL;

 
 /* Retrieve the FDERIVES/FIRSTS sets of the nonterminals numbered Var.  */
 
 /* Retrieve the FDERIVES/FIRSTS sets of the nonterminals numbered Var.  */

-#define FDERIVES(Var)   (fderives + ((Var) - ntokens) * rulesetsize)
-#define   FIRSTS(Var)   (firsts   + ((Var) - ntokens) * varsetsize)
-
-/* number of words required to hold a bit for each rule */
-static int rulesetsize;
-
-/* number of words required to hold a bit for each variable */
-static int varsetsize;
+#define FDERIVES(Var)   fderives[(Var) - ntokens]
+#define   FIRSTS(Var)   firsts[(Var) - ntokens]

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


@@ -52,28 +50,36 @@ static int varsetsize;
 `-----------------*/
 
 static void
 `-----------------*/
 
 static void

-print_closure (int n)
+print_closure (const char *title, item_number_t *array, size_t size)

 {
 {

-  int i;
-  fprintf (stderr, "n = %d\n", n);
-  for (i = 0; i < itemsetsize; ++i)
-    fprintf (stderr, "   %d\n", itemset[i]);
-  fprintf (stderr, "\n\n");
+  size_t i;
+  fprintf (stderr, "Closure: %s\n", title);
+  for (i = 0; i < size; ++i)
+    {
+      item_number_t *rp;
+      fprintf (stderr, "  %2d: .", array[i]);
+      for (rp = &ritem[array[i]]; *rp >= 0; ++rp)
+       fprintf (stderr, " %s", symbol_tag_get (symbols[*rp]));
+      fprintf (stderr, "  (rule %d)\n", -*rp - 1);
+    }
+  fputs ("\n\n", stderr);

 }
 
 
 static void
 print_firsts (void)
 {
 }
 
 
 static void
 print_firsts (void)
 {

-  int i, j;
+  symbol_number_t i, j;

 
   fprintf (stderr, "FIRSTS\n");
   for (i = ntokens; i < nsyms; i++)
     {
 
   fprintf (stderr, "FIRSTS\n");
   for (i = ntokens; i < nsyms; i++)
     {

-      fprintf (stderr, "\t%s firsts\n", tags[i]);
-      for (j = 0; j < nvars; j++)
-       if (BITISSET (FIRSTS (i), j))
-         fprintf (stderr, "\t\t%d (%s)\n", j + ntokens, tags[j + ntokens]);
+      fprintf (stderr, "\t%s firsts\n", symbol_tag_get (symbols[i]));
+      BITSET_EXECUTE (FIRSTS (i), 0, j,
+      {
+       fprintf (stderr, "\t\t%s\n",
+                symbol_tag_get (symbols[j + ntokens]));
+      });

     }
   fprintf (stderr, "\n\n");
 }
     }
   fprintf (stderr, "\n\n");
 }


@@ -83,54 +89,55 @@ static void
 print_fderives (void)
 {
   int i;
 print_fderives (void)
 {
   int i;

-  int j;
+  rule_number_t r;

 
   fprintf (stderr, "FDERIVES\n");
 
   fprintf (stderr, "FDERIVES\n");

-

   for (i = ntokens; i < nsyms; i++)
     {
   for (i = ntokens; i < nsyms; i++)
     {

-      fprintf (stderr, "\t%s derives\n", tags[i]);
-      for (j = 0; j <= nrules; j++)
-       if (BITISSET (FDERIVES (i), j))
-         {
-           short *rhsp;
-           fprintf (stderr, "\t\t%d:", j);
-           for (rhsp = ritem + rule_table[j].rhs; *rhsp > 0; ++rhsp)
-             fprintf (stderr, " %s", tags[*rhsp]);
-           fputc ('\n', stderr);
-         }
+      fprintf (stderr, "\t%s derives\n", symbol_tag_get (symbols[i]));
+      BITSET_EXECUTE (FDERIVES (i), 0, r,
+      {
+       item_number_t *rhsp = NULL;
+       fprintf (stderr, "\t\t%d:", r - 1);
+       for (rhsp = rules[r].rhs; *rhsp >= 0; ++rhsp)
+         fprintf (stderr, " %s", symbol_tag_get (symbols[*rhsp]));
+       fputc ('\n', stderr);
+      });

     }
   fprintf (stderr, "\n\n");
 }
 \f
     }
   fprintf (stderr, "\n\n");
 }
 \f

-/*-------------------------------------------------------------------.
-| Set FIRSTS to be an NVARS by NVARS bit matrix indicating which     |
-| items can represent the beginning of the input corresponding to    |
-| which other items.                                                 |
-|                                                                    |
-| For example, if some rule expands symbol 5 into the sequence of    |
-| symbols 8 3 20, the symbol 8 can be the beginning of the data for  |
-| symbol 5, so the bit [8 - ntokens, 5 - ntokens] in firsts is set.  |
-`-------------------------------------------------------------------*/
+/*------------------------------------------------------------------.
+| Set FIRSTS to be an NVARS array of NVARS bitsets indicating which |
+| items can represent the beginning of the input corresponding to   |
+| which other items.                                                |
+|                                                                   |
+| For example, if some rule expands symbol 5 into the sequence of   |
+| symbols 8 3 20, the symbol 8 can be the beginning of the data for |
+| symbol 5, so the bit [8 - ntokens] in first[5 - ntokens] (= FIRST |
+| (5)) is set.                                                      |
+`------------------------------------------------------------------*/

 
 static void
 set_firsts (void)
 {
 
 static void
 set_firsts (void)
 {

-  int i, j;
+  symbol_number_t i, j;

 
 

-  varsetsize = WORDSIZE (nvars);
-
-  firsts = XCALLOC (unsigned, nvars * varsetsize);
+  firsts = bitsetv_create (nvars, nvars, BITSET_FIXED);

 
   for (i = ntokens; i < nsyms; i++)
     for (j = 0; derives[i][j] >= 0; ++j)
       {
 
   for (i = ntokens; i < nsyms; i++)
     for (j = 0; derives[i][j] >= 0; ++j)
       {

-       int symbol = ritem[rule_table[derives[i][j]].rhs];
+       int symbol = rules[derives[i][j]].rhs[0];

        if (ISVAR (symbol))
        if (ISVAR (symbol))

-         SETBIT (FIRSTS (i), symbol - ntokens);
+         bitset_set (FIRSTS (i), symbol - ntokens);

       }
 
       }
 

-  RTC (firsts, nvars);
+  if (trace_flag)
+    bitsetv_matrix_dump (stderr, "RTC: Firsts Input", firsts);
+  bitsetv_reflexive_transitive_closure (firsts);
+  if (trace_flag)
+    bitsetv_matrix_dump (stderr, "RTC: Firsts Output", firsts);

 
   if (trace_flag)
     print_firsts ();
 
   if (trace_flag)
     print_firsts ();


@@ -149,32 +156,33 @@ set_firsts (void)
 static void
 set_fderives (void)
 {
 static void
 set_fderives (void)
 {

-  int i, j, k;
+  symbol_number_t i, j;
+  rule_number_t k;

 
 

-  fderives = XCALLOC (unsigned, nvars * rulesetsize);
+  fderives = bitsetv_create (nvars, nrules + 1, BITSET_FIXED);

 
   set_firsts ();
 
   for (i = ntokens; i < nsyms; ++i)
     for (j = ntokens; j < nsyms; ++j)
 
   set_firsts ();
 
   for (i = ntokens; i < nsyms; ++i)
     for (j = ntokens; j < nsyms; ++j)

-      if (BITISSET (FIRSTS (i), j - ntokens))
+      if (bitset_test (FIRSTS (i), j - ntokens))

        for (k = 0; derives[j][k] > 0; ++k)
        for (k = 0; derives[j][k] > 0; ++k)

-         SETBIT (FDERIVES (i), derives[j][k]);
+         bitset_set (FDERIVES (i), derives[j][k]);

 
   if (trace_flag)
     print_fderives ();
 
 
   if (trace_flag)
     print_fderives ();
 

-  XFREE (firsts);
+  bitsetv_free (firsts);

 }
 }

+

 \f
 
 void
 new_closure (int n)
 {
 \f
 
 void
 new_closure (int n)
 {

-  itemset = XCALLOC (short, n);
+  itemset = XCALLOC (item_number_t, n);

 
 

-  rulesetsize = WORDSIZE (nrules + 1);
-  ruleset = XCALLOC (unsigned, rulesetsize);
+  ruleset = bitset_create (nrules + 1, BITSET_FIXED);

 
   set_fderives ();
 }
 
   set_fderives ();
 }


@@ -182,66 +190,47 @@ new_closure (int n)
 
 
 void
 
 
 void

-closure (short *core, int n)
+closure (item_number_t *core, int n)

 {
   /* Index over CORE. */
   int c;
 
 {
   /* Index over CORE. */
   int c;
 

-  /* Index over RULESET. */
-  int r;
-

   /* A bit index over RULESET. */
   /* A bit index over RULESET. */

-  int ruleno;
+  rule_number_t ruleno;

 
   if (trace_flag)
 
   if (trace_flag)

-    {
-      fprintf (stderr, "Entering closure (items = {");
-      for (c = 0; c < n; ++c)
-       fprintf (stderr, " %d ", core[c]);
-      fprintf (stderr, "})\n");
-    }
+    print_closure ("input", core, n);

 
 

-  if (n == 0)
-    {
-      for (r = 0; r < rulesetsize; ++r)
-       ruleset[r] = FDERIVES (start_symbol)[r];
-    }
-  else
-    {
-      for (r = 0; r < rulesetsize; ++r)
-       ruleset[r] = 0;
+  bitset_zero (ruleset);

 
 

-      for (c = 0; c < n; ++c)
-       if (ISVAR (ritem[core[c]]))
-         for (r = 0; r < rulesetsize; ++r)
-           ruleset[r] |= FDERIVES (ritem[core[c]])[r];
-    }
+  for (c = 0; c < n; ++c)
+    if (ISVAR (ritem[core[c]]))
+      bitset_or (ruleset, ruleset, FDERIVES (ritem[core[c]]));

 
 

-  itemsetsize = 0;
+  nritemset = 0;

   c = 0;
   c = 0;

-  for (ruleno = 0; ruleno < rulesetsize * BITS_PER_WORD; ++ruleno)
-    if (BITISSET (ruleset, ruleno))
+  BITSET_EXECUTE (ruleset, 0, ruleno,
+  {
+    item_number_t itemno = rules[ruleno].rhs - ritem;
+    while (c < n && core[c] < itemno)

       {
       {

-       int itemno = rule_table[ruleno].rhs;
-       while (c < n && core[c] < itemno)
-         {
-           itemset[itemsetsize] = core[c];
-           itemsetsize++;
-           c++;
-         }
-       itemset[itemsetsize] = itemno;
-       itemsetsize++;
+       itemset[nritemset] = core[c];
+       nritemset++;
+       c++;

       }
       }

+    itemset[nritemset] = itemno;
+    nritemset++;
+  });

 
   while (c < n)
     {
 
   while (c < n)
     {

-      itemset[itemsetsize] = core[c];
-      itemsetsize++;
+      itemset[nritemset] = core[c];
+      nritemset++;

       c++;
     }
 
   if (trace_flag)
       c++;
     }
 
   if (trace_flag)

-    print_closure (n);
+    print_closure ("output", itemset, nritemset);

 }
 
 
 }
 
 


@@ -249,6 +238,6 @@ void
 free_closure (void)
 {
   XFREE (itemset);
 free_closure (void)
 {
   XFREE (itemset);

-  XFREE (ruleset);
-  XFREE (fderives);
+  bitset_free (ruleset);
+  bitsetv_free (fderives);

 }
 }