-/* Subroutines for bison
- Copyright 1984, 1989, 2000, 2001 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.
02111-1307, USA. */
#include "system.h"
+
+#include <bitset.h>
+#include <bitsetv-print.h>
+#include <bitsetv.h>
+#include <quotearg.h>
+
+#include "closure.h"
+#include "derives.h"
#include "getargs.h"
#include "gram.h"
#include "reader.h"
-#include "closure.h"
-#include "derives.h"
-#include "warshall.h"
+#include "symtab.h"
/* NITEMSET is the size of the array ITEMSET. */
-short *itemset;
-int nitemset;
+item_number *itemset;
+int nritemset;
-static unsigned *ruleset;
+static bitset ruleset;
/* 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. */
-#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
/*-----------------.
`-----------------*/
static void
-print_closure (const char *title, short *array, size_t size)
+print_closure (char const *title, item_number *array, size_t size)
{
size_t i;
fprintf (stderr, "Closure: %s\n", title);
for (i = 0; i < size; ++i)
{
- short *rp;
+ item_number *rp;
fprintf (stderr, " %2d: .", array[i]);
- for (rp = &ritem[array[i]]; *rp > 0; ++rp)
- fprintf (stderr, " %s", tags[*rp]);
- fprintf (stderr, " (rule %d)\n", -*rp);
+ 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)
{
- int i, j;
+ symbol_number i, j;
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]);
+ 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");
}
print_fderives (void)
{
int i;
- int j;
+ rule_number r;
fprintf (stderr, "FDERIVES\n");
-
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);
- }
+ 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);
+ }
}
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)
{
- int i, j;
-
- varsetsize = WORDSIZE (nvars);
+ symbol_number i, j;
- 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 (j = 0; derives[i - ntokens][j]; ++j)
{
- int symbol = ritem[rule_table[derives[i][j]].rhs];
- if (ISVAR (symbol))
- SETBIT (FIRSTS (i), symbol - ntokens);
+ item_number sym = derives[i - ntokens][j]->rhs[0];
+ if (ISVAR (sym))
+ bitset_set (FIRSTS (i), sym - ntokens);
}
- RTC (firsts, nvars);
+ 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)
+ if (trace_flag & trace_sets)
print_firsts ();
}
static void
set_fderives (void)
{
- int i, j, k;
+ symbol_number i, j;
+ rule_number k;
- fderives = XCALLOC (unsigned, nvars * rulesetsize);
+ fderives = bitsetv_create (nvars, nrules, BITSET_FIXED);
set_firsts ();
for (i = ntokens; i < nsyms; ++i)
for (j = ntokens; j < nsyms; ++j)
- if (BITISSET (FIRSTS (i), j - ntokens))
- for (k = 0; derives[j][k] > 0; ++k)
- SETBIT (FDERIVES (i), derives[j][k]);
+ if (bitset_test (FIRSTS (i), j - ntokens))
+ for (k = 0; derives[j - ntokens][k]; ++k)
+ bitset_set (FDERIVES (i), derives[j - ntokens][k]->number);
- if (trace_flag)
+ if (trace_flag & trace_sets)
print_fderives ();
- XFREE (firsts);
+ bitsetv_free (firsts);
}
+
\f
void
new_closure (int n)
{
- itemset = XCALLOC (short, n);
+ CALLOC (itemset, n);
- rulesetsize = WORDSIZE (nrules + 1);
- ruleset = XCALLOC (unsigned, rulesetsize);
+ ruleset = bitset_create (nrules, BITSET_FIXED);
set_fderives ();
}
void
-closure (short *core, int n)
+closure (item_number *core, int n)
{
/* Index over CORE. */
int c;
- /* Index over RULESET. */
- int r;
-
/* A bit index over RULESET. */
- int ruleno;
+ rule_number ruleno;
+
+ bitset_iterator iter;
- if (trace_flag)
+ if (trace_flag & trace_sets)
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]]));
- nitemset = 0;
+ nritemset = 0;
c = 0;
- for (ruleno = 0; ruleno < nrules + 1; ++ruleno)
- if (BITISSET (ruleset, ruleno))
- {
- int itemno = rule_table[ruleno].rhs;
- while (c < n && core[c] < itemno)
- {
- itemset[nitemset] = core[c];
- nitemset++;
- c++;
- }
- itemset[nitemset] = itemno;
- nitemset++;
- }
+ BITSET_FOR_EACH (iter, ruleset, ruleno, 0)
+ {
+ item_number itemno = rules[ruleno].rhs - ritem;
+ while (c < n && core[c] < itemno)
+ {
+ itemset[nritemset] = core[c];
+ nritemset++;
+ c++;
+ }
+ itemset[nritemset] = itemno;
+ nritemset++;
+ };
while (c < n)
{
- itemset[nitemset] = core[c];
- nitemset++;
+ itemset[nritemset] = core[c];
+ nritemset++;
c++;
}
- if (trace_flag)
- print_closure ("output", itemset, nitemset);
+ if (trace_flag & trace_sets)
+ print_closure ("output", itemset, nritemset);
}
free_closure (void)
{
XFREE (itemset);
- XFREE (ruleset);
- XFREE (fderives);
+ bitset_free (ruleset);
+ bitsetv_free (fderives);
}
projects / bison.git / blobdiff