Adjust to renamings.

[bison.git] / src / closure.c

diff --git a/src/closure.c b/src/closure.c
index 27acf7c557fbdb854bff70cebccc5de7a4e50c99..618846dc8d40b92a233256b72bc76aebae7a5a13 100644 (file)
--- a/src/closure.c
+++ b/src/closure.c
@@ -1,5 +1,6 @@
-/* Subroutines for bison
-   Copyright (C) 1984, 1989, 2000 Free Software Foundation, Inc.
+/* Closures for Bison
+
+   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.
 


@@ -19,62 +20,72 @@
    02111-1307, USA.  */
 
 #include "system.h"
    02111-1307, USA.  */
 
 #include "system.h"

-#include "xalloc.h"
-#include "gram.h"
+
+#include <bitset.h>
+#include <bitsetv-print.h>
+#include <bitsetv.h>
+#include <quotearg.h>
+

 #include "closure.h"
 #include "derives.h"
 #include "closure.h"
 #include "derives.h"

-#include "warshall.h"
+#include "getargs.h"
+#include "gram.h"
+#include "reader.h"
+#include "symtab.h"

 
 

-short *itemset;
-short *itemsetend;
-static unsigned *ruleset;
+/* NITEMSET is the size of the array ITEMSET.  */
+item_number *itemset;
+int nritemset;

 
 

-/* internal data.  See comments before set_fderives and set_firsts.  */
-static unsigned *fderives;
-static unsigned *firsts;
+static bitset ruleset;

 
 

-/* number of words required to hold a bit for each rule */
-static int rulesetsize;
+/* internal data.  See comments before set_fderives and set_firsts.  */
+static bitsetv fderives = NULL;
+static bitsetv firsts = NULL;

 
 

-/* number of words required to hold a bit for each variable */
-static int varsetsize;
+/* Retrieve the FDERIVES/FIRSTS sets of the nonterminals numbered Var.  */
+#define FDERIVES(Var)   fderives[(Var) - ntokens]
+#define   FIRSTS(Var)   firsts[(Var) - ntokens]

 \f
 \f

-#if DEBUG

 
 /*-----------------.
 | Debugging code.  |
 `-----------------*/
 
 static void
 
 /*-----------------.
 | Debugging code.  |
 `-----------------*/
 
 static void

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

 {
 {

-  short *isp;
-
-  printf ("\n\nn = %d\n\n", n);
-  for (isp = itemset; isp < itemsetend; isp++)
-    printf ("   %d\n", *isp);
+  size_t i;
+  fprintf (stderr, "Closure: %s\n", title);
+  for (i = 0; i < size; ++i)
+    {
+      item_number *rp;
+      fprintf (stderr, "  %2d: .", array[i]);
+      for (rp = &ritem[array[i]]; *rp >= 0; ++rp)
+       fprintf (stderr, " %s", symbols[*rp]->tag);
+      fprintf (stderr, "  (rule %d)\n", -*rp - 1);
+    }
+  fputs ("\n\n", stderr);

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

-  int i;
-  int j;
-  unsigned *rowp;
-
-  printf ("\n\n\nFIRSTS\n\n");
+  symbol_number i, j;

 
 

+  fprintf (stderr, "FIRSTS\n");

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

-      printf ("\n\n%s firsts\n\n", tags[i]);
-
-      rowp = firsts + ((i - ntokens) * varsetsize);
-
-      for (j = 0; j < nvars; j++)
-       if (BITISSET (rowp, j))
-         printf ("   %s\n", tags[j + ntokens]);
+      bitset_iterator iter;
+      fprintf (stderr, "\t%s firsts\n", symbols[i]->tag);
+      BITSET_FOR_EACH (iter, FIRSTS (i), j, 0)
+       {
+         fprintf (stderr, "\t\t%s\n",
+                  symbols[j + ntokens]->tag);
+       }

     }
     }

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

 }
 
 
 }
 
 


@@ -82,71 +93,56 @@ static void
 print_fderives (void)
 {
   int i;
 print_fderives (void)
 {
   int i;

-  int j;
-  unsigned *rp;
-
-  printf ("\n\n\nFDERIVES\n");
+  rule_number r;

 
 

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

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

-      printf ("\n\n%s derives\n\n", tags[i]);
-      rp = fderives + i * rulesetsize;
-
-      for (j = 0; j <= nrules; j++)
-       if (BITISSET (rp, j))
-         printf ("   %d\n", j);
+      bitset_iterator iter;
+      fprintf (stderr, "\t%s derives\n", symbols[i]->tag);
+      BITSET_FOR_EACH (iter, FDERIVES (i), r, 0)
+       {
+         fprintf (stderr, "\t\t%3d ", r);
+         rule_rhs_print (&rules[r], stderr);
+       }

     }
     }

-
-  fflush (stdout);
+  fprintf (stderr, "\n\n");

 }
 }

-#endif

 \f
 \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)
 {

-  unsigned *row;
-  int symbol;
-  short *sp;
-  int rowsize;
-
-  int i;
+  symbol_number i, j;

 
 

-  varsetsize = rowsize = WORDSIZE (nvars);
+  firsts = bitsetv_create (nvars, nvars, BITSET_FIXED);

 
 

-  firsts = XCALLOC (unsigned, nvars * rowsize);
-
-  row = firsts;

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

-    {
-      sp = derives[i];
-      while (*sp >= 0)
-       {
-         symbol = ritem[rrhs[*sp++]];
-         if (ISVAR (symbol))
-           {
-             symbol -= ntokens;
-             SETBIT (row, symbol);
-           }
-       }
-
-      row += rowsize;
-    }
-
-  RTC (firsts, nvars);
-
-#ifdef DEBUG
-  print_firsts ();
-#endif
+    for (j = 0; derives[i][j]; ++j)
+      {
+       item_number sym = derives[i][j]->rhs[0];
+       if (ISVAR (sym))
+         bitset_set (FIRSTS (i), sym - ntokens);
+      }
+
+  if (trace_flag & trace_sets)
+    bitsetv_matrix_dump (stderr, "RTC: Firsts Input", firsts);
+  bitsetv_reflexive_transitive_closure (firsts);
+  if (trace_flag & trace_sets)
+    bitsetv_matrix_dump (stderr, "RTC: Firsts Output", firsts);
+
+  if (trace_flag & trace_sets)
+    print_firsts ();

 }
 
 /*-------------------------------------------------------------------.
 }
 
 /*-------------------------------------------------------------------.


@@ -162,64 +158,33 @@ set_firsts (void)
 static void
 set_fderives (void)
 {
 static void
 set_fderives (void)
 {

-  unsigned *rrow;
-  unsigned *vrow;
-  int j;
-  unsigned cword;
-  short *rp;
-  int b;
-
-  int ruleno;
-  int i;
+  symbol_number i, j;
+  rule_number k;

 
 

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

 
   set_firsts ();
 
 
   set_firsts ();
 

-  rrow = fderives + ntokens * rulesetsize;
+  for (i = ntokens; i < nsyms; ++i)
+    for (j = ntokens; j < nsyms; ++j)
+      if (bitset_test (FIRSTS (i), j - ntokens))
+       for (k = 0; derives[j][k]; ++k)
+         bitset_set (FDERIVES (i), derives[j][k]->number);

 
 

-  for (i = ntokens; i < nsyms; i++)
-    {
-      vrow = firsts + ((i - ntokens) * varsetsize);
-      cword = *vrow++;
-      b = 0;
-      for (j = ntokens; j < nsyms; j++)
-       {
-         if (cword & (1 << b))
-           {
-             rp = derives[j];
-             while ((ruleno = *rp++) > 0)
-               {
-                 SETBIT (rrow, ruleno);
-               }
-           }
-
-         b++;
-         if (b >= BITS_PER_WORD && j + 1 < nsyms)
-           {
-             cword = *vrow++;
-             b = 0;
-           }
-       }
-
-      rrow += rulesetsize;
-    }
+  if (trace_flag & trace_sets)
+    print_fderives ();

 
 

-#ifdef DEBUG
-  print_fderives ();
-#endif
-
-  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, n);

 
 

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

 
   set_fderives ();
 }
 
   set_fderives ();
 }


@@ -227,84 +192,49 @@ new_closure (int n)
 
 
 void
 
 
 void

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

 {
 {

-  int ruleno;
-  unsigned word;
-  short *csp;
-  unsigned *dsp;
-  unsigned *rsp;
-
-  short *csend;
-  unsigned *rsend;
-  int symbol;
-  int itemno;
-
-  rsp = ruleset;
-  rsend = ruleset + rulesetsize;
-  csend = core + n;
-
-  if (n == 0)
-    {
-      dsp = fderives + start_symbol * rulesetsize;
-      while (rsp < rsend)
-       *rsp++ = *dsp++;
-    }
-  else
-    {
-      while (rsp < rsend)
-       *rsp++ = 0;
+  /* Index over CORE. */
+  int c;

 
 

-      csp = core;
-      while (csp < csend)
-       {
-         symbol = ritem[*csp++];
-         if (ISVAR (symbol))
-           {
-             dsp = fderives + symbol * rulesetsize;
-             rsp = ruleset;
-             while (rsp < rsend)
-               *rsp++ |= *dsp++;
-           }
-       }
-    }
+  /* A bit index over RULESET. */
+  rule_number ruleno;
+
+  bitset_iterator iter;
+
+  if (trace_flag & trace_sets)
+    print_closure ("input", core, n);

 
 

-  ruleno = 0;
-  itemsetend = itemset;
-  csp = core;
-  rsp = ruleset;
-  while (rsp < rsend)
+  bitset_zero (ruleset);
+
+  for (c = 0; c < n; ++c)
+    if (ISVAR (ritem[core[c]]))
+      bitset_or (ruleset, ruleset, FDERIVES (ritem[core[c]]));
+
+  nritemset = 0;
+  c = 0;
+  BITSET_FOR_EACH (iter, ruleset, ruleno, 0)

     {
     {

-      word = *rsp++;
-      if (word == 0)
-       {
-         ruleno += BITS_PER_WORD;
-       }
-      else
+      item_number itemno = rules[ruleno].rhs - ritem;
+      while (c < n && core[c] < itemno)

        {
        {

-         int b;
-
-         for (b = 0; b < BITS_PER_WORD; b++)
-           {
-             if (word & (1 << b))
-               {
-                 itemno = rrhs[ruleno];
-                 while (csp < csend && *csp < itemno)
-                   *itemsetend++ = *csp++;
-                 *itemsetend++ = itemno;
-               }
-
-             ruleno++;
-           }
+         itemset[nritemset] = core[c];
+         nritemset++;
+         c++;

        }
        }

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

 
 

-  while (csp < csend)
-    *itemsetend++ = *csp++;
+  while (c < n)
+    {
+      itemset[nritemset] = core[c];
+      nritemset++;
+      c++;
+    }

 
 

-#if DEBUG
-  print_closure (n);
-#endif
+  if (trace_flag & trace_sets)
+    print_closure ("output", itemset, nritemset);

 }
 
 
 }
 
 


@@ -312,6 +242,6 @@ void
 free_closure (void)
 {
   XFREE (itemset);
 free_closure (void)
 {
   XFREE (itemset);

-  XFREE (ruleset);
-  XFREE (fderives + ntokens * rulesetsize);
+  bitset_free (ruleset);
+  bitsetv_free (fderives);

 }
 }