/* Subroutines for bison
- Copyright (C) 1984, 1989 Free Software Foundation, Inc.
+ Copyright (C) 1984, 1989, 2000 Free Software Foundation, Inc.
-This file is part of Bison, the GNU Compiler Compiler.
+ This file is part of Bison, the GNU Compiler Compiler.
-Bison is free software; you can redistribute it and/or modify
-it under the terms of the GNU General Public License as published by
-the Free Software Foundation; either version 2, or (at your option)
-any later version.
+ Bison is free software; you can redistribute it and/or modify it
+ under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2, or (at your option)
+ any later version.
-Bison is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-GNU General Public License for more details.
+ Bison is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ General Public License for more details.
-You should have received a copy of the GNU General Public License
-along with Bison; see the file COPYING. If not, write to
-the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
+ You should have received a copy of the GNU General Public License
+ along with Bison; see the file COPYING. If not, write to the Free
+ Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
+ 02111-1307, USA. */
-/* subroutines of file LR0.c.
+/* Subroutines of file LR0.c.
Entry points:
closure (items, n)
-Given a vector of item numbers items, of length n,
-set up ruleset and itemset to indicate what rules could be run
-and which items could be accepted when those items are the active ones.
+Given a vector of item numbers items, of length n, set up ruleset and
+itemset to indicate what rules could be run and which items could be
+accepted when those items are the active ones.
-ruleset contains a bit for each rule. closure sets the bits
-for all rules which could potentially describe the next input to be read.
+ruleset contains a bit for each rule. closure sets the bits for all
+rules which could potentially describe the next input to be read.
-itemset is a vector of item numbers; itemsetend points to just beyond the end
- of the part of it that is significant.
-closure places there the indices of all items which represent units of
-input that could arrive next.
+itemset is a vector of item numbers; itemsetend points to just beyond
+the end of the part of it that is significant. closure places there
+the indices of all items which represent units of input that could
+arrive next.
initialize_closure (n)
-Allocates the itemset and ruleset vectors,
-and precomputes useful data so that closure can be called.
-n is the number of elements to allocate for itemset.
+Allocates the itemset and ruleset vectors, and precomputes useful data
+so that closure can be called. n is the number of elements to
+allocate for itemset.
finalize_closure ()
*/
-#include <stdio.h>
#include "system.h"
-#include "machine.h"
#include "alloc.h"
#include "gram.h"
extern short **derives;
extern char **tags;
-void initialize_closure PARAMS((int));
-void set_fderives PARAMS((void));
-void set_firsts PARAMS((void));
-void closure PARAMS((short *, int));
-void finalize_closure PARAMS((void));
+extern void initialize_closure PARAMS((int));
+extern void closure PARAMS((short *, int));
+extern void finalize_closure PARAMS((void));
+
+static void set_fderives PARAMS((void));
+static void set_firsts PARAMS((void));
extern void RTC PARAMS((unsigned *, int));
/* number of words required to hold a bit for each variable */
static int varsetsize;
+#ifdef DEBUG
+static void print_closure PARAMS((int));
+static void print_fderives PARAMS((void));
+static void print_firsts PARAMS((void));
+#endif
void
initialize_closure (int n)
for each nonterminal. For example, if symbol 5 can be derived as
the sequence of symbols 8 3 20, and one of the rules for deriving
symbol 8 is rule 4, then the [5 - ntokens, 4] bit in fderives is set. */
-void
+static void
set_fderives (void)
{
register unsigned *rrow;
-/* 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. */
-void
+/* 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. */
+
+static void
set_firsts (void)
{
register unsigned *row;
RTC(firsts, nvars);
#ifdef DEBUG
- print_firsts();
+ print_firsts ();
#endif
}
#ifdef DEBUG
-print_closure(n)
-int n;
+static void
+print_closure(int n)
{
register short *isp;
- printf("\n\nn = %d\n\n", n);
+ printf ("\n\nn = %d\n\n", n);
for (isp = itemset; isp < itemsetend; isp++)
- printf(" %d\n", *isp);
+ printf (" %d\n", *isp);
}
-void
+static void
print_firsts (void)
{
register int i;
register int j;
register unsigned *rowp;
- printf(_("\n\n\nFIRSTS\n\n"));
+ printf ("\n\n\nFIRSTS\n\n");
for (i = ntokens; i < nsyms; i++)
{
- printf(_("\n\n%s firsts\n\n"), tags[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]);
+ printf (" %s\n", tags[j + ntokens]);
}
}
-void
+static void
print_fderives (void)
{
register int i;
register int j;
register unsigned *rp;
- printf(_("\n\n\nFDERIVES\n"));
+ printf ("\n\n\nFDERIVES\n");
for (i = ntokens; i < nsyms; i++)
{
- printf(_("\n\n%s derives\n\n"), tags[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);
+ printf (" %d\n", j);
}
fflush(stdout);
projects / bison.git / blobdiff