/* 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.
02111-1307, USA. */
#include "system.h"
+#include "quotearg.h"
+#include "bitset.h"
+#include "bitsetv.h"
+#include "bitsetv-print.h"
#include "getargs.h"
+#include "symtab.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. */
-static unsigned *fderives;
-static unsigned *firsts;
+static bitsetv fderives = NULL;
+static bitsetv firsts = NULL;
-#define FDERIVES(Symbol) (fderives + (Symbol) * rulesetsize)
-#define FIRSTS(Symbol) (firsts + (Symbol) * 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;
+/* Retrieve the FDERIVES/FIRSTS sets of the nonterminals numbered Var. */
+#define FDERIVES(Var) fderives[(Var) - ntokens]
+#define FIRSTS(Var) firsts[(Var) - ntokens]
\f
/*-----------------.
`-----------------*/
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",
+ quotearg_style (escape_quoting_style, symbols[*rp]->tag));
+ fprintf (stderr, " (rule %d)\n", -*rp - 1);
+ }
+ fputs ("\n\n", stderr);
}
static void
print_firsts (void)
{
- int i;
- int j;
- unsigned *rowp;
+ int i, j;
fprintf (stderr, "FIRSTS\n");
-
for (i = ntokens; i < nsyms; i++)
{
- fprintf (stderr, "\t%s firsts\n", tags[i]);
-
- rowp = FIRSTS (i - ntokens);
-
+ fprintf (stderr, "\t%s firsts\n",
+ quotearg_style (escape_quoting_style, symbols[i]->tag));
for (j = 0; j < nvars; j++)
- if (BITISSET (rowp, j))
- fprintf (stderr, "\t\t%d (%s)\n", j + ntokens, tags[j + ntokens]);
+ if (bitset_test (FIRSTS (i), j))
+ fprintf (stderr, "\t\t%s\n",
+ quotearg_style (escape_quoting_style,
+ symbols[j + ntokens]->tag));
}
fprintf (stderr, "\n\n");
}
static void
print_fderives (void)
{
- int i;
- int j;
- unsigned *rp;
+ int i, j;
fprintf (stderr, "FDERIVES\n");
-
for (i = ntokens; i < nsyms; i++)
{
- fprintf (stderr, "\t%s derives\n", tags[i]);
- rp = FDERIVES (i);
-
- for (j = 0; j <= nrules; j++)
- if (BITISSET (rp, j))
+ fprintf (stderr, "\t%s derives\n",
+ quotearg_style (escape_quoting_style, symbols[i]->tag));
+ for (j = 0; j < nrules + 1; j++)
+ if (bitset_test (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]);
+ item_number_t *rhsp;
+ fprintf (stderr, "\t\t%d:", j - 1);
+ for (rhsp = rules[j].rhs; *rhsp >= 0; ++rhsp)
+ fprintf (stderr, " %s",
+ quotearg_style (escape_quoting_style,
+ symbols[*rhsp]->tag));
fputc ('\n', 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)
{
- unsigned *row;
- int symbol;
- short *sp;
- int rowsize;
-
- int i;
-
- varsetsize = rowsize = WORDSIZE (nvars);
+ int i, j;
- firsts = XCALLOC (unsigned, nvars * rowsize);
+ firsts = bitsetv_create (nvars, nvars, BITSET_FIXED);
- row = firsts;
for (i = ntokens; i < nsyms; i++)
- {
- sp = derives[i];
- while (*sp >= 0)
- {
- symbol = ritem[rule_table[*sp++].rhs];
- if (ISVAR (symbol))
- {
- symbol -= ntokens;
- SETBIT (row, symbol);
- }
- }
-
- row += rowsize;
- }
+ for (j = 0; derives[i][j] >= 0; ++j)
+ {
+ int symbol = rules[derives[i][j]].rhs[0];
+ if (ISVAR (symbol))
+ 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 ();
static void
set_fderives (void)
{
- unsigned *rrow;
- unsigned *vrow;
- int j;
- unsigned cword;
- short *rp;
- int b;
+ int i, j, k;
- int ruleno;
- int i;
-
- fderives = XCALLOC (unsigned, nvars * rulesetsize) - ntokens * rulesetsize;
+ fderives = bitsetv_create (nvars, nrules + 1, BITSET_FIXED);
set_firsts ();
- rrow = FDERIVES (ntokens);
-
- for (i = ntokens; i < nsyms; i++)
- {
- vrow = FIRSTS (i - ntokens);
- 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;
- }
+ 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] > 0; ++k)
+ bitset_set (FDERIVES (i), derives[j][k]);
if (trace_flag)
print_fderives ();
- XFREE (firsts);
+ bitsetv_free (firsts);
}
+
\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 ();
}
void
-closure (short *core, int n)
+closure (item_number_t *core, int n)
{
- int ruleno;
/* Index over CORE. */
int c;
- /* Index over RULESET. */
- int r;
-
- int itemno;
+ /* A bit index over RULESET. */
+ int ruleno;
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]]));
- ruleno = 0;
- itemsetsize = 0;
+ nritemset = 0;
c = 0;
- for (r = 0; r < rulesetsize; ++r)
- {
- if (ruleset[r] == 0)
- {
- ruleno += BITS_PER_WORD;
- }
- else
- {
- int b;
-
- for (b = 0; b < BITS_PER_WORD; b++)
- {
- if (ruleset[r] & (1 << b))
- {
- itemno = rule_table[ruleno].rhs;
- while (c < n && core[c] < itemno)
- {
- itemset[itemsetsize] = core[c];
- itemsetsize++;
- c++;
- }
- itemset[itemsetsize] = itemno;
- itemsetsize++;
- }
-
- ruleno++;
- }
- }
- }
+ for (ruleno = 0; ruleno < nrules + 1; ++ruleno)
+ if (bitset_test (ruleset, ruleno))
+ {
+ item_number_t 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[itemsetsize] = core[c];
- itemsetsize++;
+ itemset[nritemset] = core[c];
+ nritemset++;
c++;
}
if (trace_flag)
- print_closure (n);
+ print_closure ("output", itemset, nritemset);
}
free_closure (void)
{
XFREE (itemset);
- XFREE (ruleset);
- XFREE (fderives + ntokens * rulesetsize);
+ bitset_free (ruleset);
+ bitsetv_free (fderives);
}
projects / bison.git / blobdiff