X-Git-Url: https://git.saurik.com/bison.git/blobdiff_plain/2f4f028d8bb527ebdab2476f76aac58f07f5b767..686e83e396696572171fad32f440cc279ab82a75:/src/reduce.c?ds=sidebyside
diff --git a/src/reduce.c b/src/reduce.c
index a6b9e629..7a30e555 100644
--- a/src/reduce.c
+++ b/src/reduce.c
@@ -1,24 +1,22 @@
/* Grammar reduction for Bison.
- Copyright (C) 1988, 1989, 2000, 2001, 2002, 2003 Free Software
+ Copyright (C) 1988-1989, 2000-2003, 2005-2011 Free Software
Foundation, Inc.
This file is part of Bison, the GNU Compiler Compiler.
- Bison is free software; you can redistribute it and/or modify
+ This program 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.
+ the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
- Bison is distributed in the hope that it will be useful,
+ This program 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, Inc., 51 Franklin Street, Fifth Floor,
- Boston, MA 02110-1301, USA. */
+ along with this program. If not, see . */
/* Reduce the grammar: Find and eliminate unreachable terminals,
@@ -27,6 +25,7 @@
/* Don't eliminate unreachable terminals: They may be used by the
user's parser. */
+#include
#include "system.h"
#include
@@ -36,6 +35,7 @@
#include "files.h"
#include "getargs.h"
#include "gram.h"
+#include "print-xml.h"
#include "reader.h"
#include "reduce.h"
#include "symtab.h"
@@ -239,7 +239,7 @@ reduce_grammar_tables (void)
rule_number r;
for (r = 0; r < nrules; r++)
rules[r].useful = bitset_test (P, r);
- grammar_rules_never_reduced_report (_("useless rule"));
+ grammar_rules_useless_report (_("rule useless in grammar"));
}
/* Map the nonterminals to their new index: useful first, useless
@@ -300,7 +300,7 @@ nonterminals_reduce (void)
if (!bitset_test (V, i))
{
nontermmap[i - ntokens] = n++;
- warn_at (symbols[i]->location, _("useless nonterminal: %s"),
+ warn_at (symbols[i]->location, _("nonterminal useless in grammar: %s"),
symbols[i]->tag);
}
@@ -348,7 +348,7 @@ reduce_output (FILE *out)
if (nuseless_nonterminals > 0)
{
int i;
- fprintf (out, "%s\n\n", _("Useless nonterminals"));
+ fprintf (out, "%s\n\n", _("Nonterminals useless in grammar"));
for (i = 0; i < nuseless_nonterminals; ++i)
fprintf (out, " %s\n", symbols[nsyms + i]->tag);
fputs ("\n\n", out);
@@ -358,10 +358,10 @@ reduce_output (FILE *out)
bool b = false;
int i;
for (i = 0; i < ntokens; i++)
- if (!bitset_test (V, i) && !bitset_test (V1, i))
+ if (reduce_token_unused_in_grammar (i))
{
if (!b)
- fprintf (out, "%s\n\n", _("Terminals which are not used"));
+ fprintf (out, "%s\n\n", _("Terminals unused in grammar"));
b = true;
fprintf (out, " %s\n", symbols[i]->tag);
}
@@ -370,14 +370,11 @@ reduce_output (FILE *out)
}
if (nuseless_productions > 0)
- grammar_rules_partial_print (out, _("Useless rules"),
- rule_useless_p);
+ grammar_rules_partial_print (out, _("Rules useless in grammar"),
+ rule_useless_in_grammar_p);
}
-
-
-
/*-------------------------------.
| Report the results to STDERR. |
`-------------------------------*/
@@ -385,29 +382,16 @@ reduce_output (FILE *out)
static void
reduce_print (void)
{
- if (yacc_flag && nuseless_productions)
- fprintf (stderr, ngettext ("%d rule never reduced\n",
- "%d rules never reduced\n",
- nuseless_productions),
- nuseless_productions);
-
- fprintf (stderr, "%s: %s: ", grammar_file, _("warning"));
-
if (nuseless_nonterminals > 0)
- fprintf (stderr, ngettext ("%d useless nonterminal",
- "%d useless nonterminals",
- nuseless_nonterminals),
- nuseless_nonterminals);
-
- if (nuseless_nonterminals > 0 && nuseless_productions > 0)
- fprintf (stderr, _(" and "));
-
+ warn (ngettext ("%d nonterminal useless in grammar",
+ "%d nonterminals useless in grammar",
+ nuseless_nonterminals),
+ nuseless_nonterminals);
if (nuseless_productions > 0)
- fprintf (stderr, ngettext ("%d useless rule",
- "%d useless rules",
- nuseless_productions),
- nuseless_productions);
- fprintf (stderr, "\n");
+ warn (ngettext ("%d rule useless in grammar",
+ "%d rules useless in grammar",
+ nuseless_productions),
+ nuseless_productions);
}
void
@@ -425,7 +409,7 @@ reduce_grammar (void)
useless_nonterminals ();
inaccessable_symbols ();
- reduced = (bool) (nuseless_nonterminals + nuseless_productions > 0);
+ reduced = (nuseless_nonterminals + nuseless_productions > 0);
if (!reduced)
return;
@@ -454,6 +438,19 @@ reduce_grammar (void)
}
}
+bool
+reduce_token_unused_in_grammar (symbol_number i)
+{
+ aver (i < ntokens);
+ return !bitset_test (V, i) && !bitset_test (V1, i);
+}
+
+bool
+reduce_nonterminal_useless_in_grammar (symbol_number i)
+{
+ aver (ntokens <= i && i < nsyms + nuseless_nonterminals);
+ return nsyms <= i;
+}
/*-----------------------------------------------------------.
| Free the global sets used to compute the reduced grammar. |