/* Data definitions for internal representation of Bison's input.
- Copyright (C) 1984, 1986, 1989, 1992, 2001, 2002
- Free Software Foundation, Inc.
+ Copyright (C) 1984, 1986, 1989, 1992, 2001-2007, 2009-2013 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., 59 Temple Place - Suite 330,
- Boston, MA 02111-1307, USA. */
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
#ifndef GRAM_H_
# define GRAM_H_
The rules receive rule numbers 1 to NRULES in the order they are
written. More precisely Bison augments the grammar with the
- initial rule, `$accept: START-SYMBOL $end', which is numbered 1,
+ initial rule, '$accept: START-SYMBOL $end', which is numbered 1,
all the user rules are 2, 3 etc. Each time a rule number is
presented to the user, we subtract 1, so *displayed* rule numbers
are 0, 1, 2...
RULES[R].prec -- the symbol providing the precedence level of R.
RULES[R].precsym -- the symbol attached (via %prec) to give its
- precedence to R. Of course, if set, it is equal to `prec', but we
+ precedence to R. Of course, if set, it is equal to 'prec', but we
need to distinguish one from the other when reducing: a symbol used
in a %prec is not useless.
# include "location.h"
# include "symtab.h"
-# define ISTOKEN(s) ((s) < ntokens)
-# define ISVAR(s) ((s) >= ntokens)
+# define ISTOKEN(i) ((i) < ntokens)
+# define ISVAR(i) ((i) >= ntokens)
extern int nsyms;
extern int ntokens;
extern int nvars;
typedef int item_number;
+# define ITEM_NUMBER_MAX INT_MAX
extern item_number *ritem;
extern unsigned int nritems;
sometimes have to perform the converse transformation. */
static inline item_number
-symbol_number_as_item_number (symbol_number s)
+symbol_number_as_item_number (symbol_number sym)
{
- return s;
+ return sym;
}
static inline symbol_number
return i;
}
-extern symbol_number start_symbol;
+static inline bool
+item_number_is_symbol_number (item_number i)
+{
+ return i >= 0;
+}
/* Rule numbers. */
-typedef short rule_number;
+typedef int rule_number;
+# define RULE_NUMBER_MAX INT_MAX
extern rule_number nrules;
static inline item_number
return -1 - i;
}
+static inline bool
+item_number_is_rule_number (item_number i)
+{
+ return i < 0;
+}
/*--------.
| Rules. |
/* This symbol provides both the associativity, and the precedence. */
symbol *prec;
- short dprec;
- short merger;
+ int dprec;
+ int merger;
/* This symbol was attached to the rule via %prec. */
symbol *precsym;
location location;
bool useful;
+ bool is_predicate;
const char *action;
location action_location;
extern rule *rules;
/* A function that selects a rule. */
-typedef bool (*rule_filter) (rule *);
+typedef bool (*rule_filter) (rule const *);
-/* Return true IFF the rule has a `number' smaller than NRULES. */
-bool rule_useful_p (rule *r);
+/* Return true IFF the rule has a 'number' smaller than NRULES. That is, it is
+ useful in the grammar. */
+bool rule_useful_in_grammar_p (rule const *r);
-/* Return true IFF the rule has a `number' higher than NRULES. */
-bool rule_useless_p (rule *r);
+/* Return true IFF the rule has a 'number' higher than NRULES. That is, it is
+ useless in the grammar. */
+bool rule_useless_in_grammar_p (rule const *r);
-/* Return true IFF the rule is not flagged as useful *and* is useful.
- In other words, it was discarded because of conflicts. */
-bool rule_never_reduced_p (rule *r);
+/* Return true IFF the rule is not flagged as useful but is useful in the
+ grammar. In other words, it was discarded because of conflicts. */
+bool rule_useless_in_parser_p (rule const *r);
/* Print this rule's number and lhs on OUT. If a PREVIOUS_LHS was
already displayed (by a previous call for another rule), avoid
useless repetitions. */
-void rule_lhs_print (rule *r, symbol *previous_lhs, FILE *out);
+void rule_lhs_print (rule const *r, symbol const *previous_lhs, FILE *out);
+void rule_lhs_print_xml (rule const *r, FILE *out, int level);
/* Return the length of the RHS. */
-int rule_rhs_length (rule *r);
+size_t rule_rhs_length (rule const *r);
/* Print this rule's RHS on OUT. */
-void rule_rhs_print (rule *r, FILE *out);
-
-/* Print this rule on OUT. */
-void rule_print (rule *r, FILE *out);
+void rule_rhs_print (rule const *r, FILE *out);
-/* GLR_PARSER is nonzero if the input file says to use the GLR
- (Generalized LR) parser, and to output some additional
- information used by the GLR algorithm. */
-
-extern int glr_parser;
-
-/* PURE_PARSER is nonzero if should generate a parser that is all pure
- and reentrant. */
-
-extern int pure_parser;
-
/* Dump RITEM for traces. */
void ritem_print (FILE *out);
/* Return the size of the longest rule RHS. */
size_t ritem_longest_rhs (void);
-/* Print the grammar's rules numbers from BEGIN (inclusive) to END
- (exclusive) on OUT under TITLE. */
+/* Print the grammar's rules that match FILTER on OUT under TITLE. */
void grammar_rules_partial_print (FILE *out, const char *title,
- rule_filter filter);
+ rule_filter filter);
-/* Print the grammar's rules on OUT. */
+/* Print the grammar's useful rules on OUT. */
void grammar_rules_print (FILE *out);
+/* Print all of the grammar's rules with a "usefulness" attribute. */
+void grammar_rules_print_xml (FILE *out, int level);
/* Dump the grammar. */
void grammar_dump (FILE *out, const char *title);
/* Report on STDERR the rules that are not flagged USEFUL, using the
- MESSAGE (which can be `useless rule' when invoked after grammar
- reduction, or `never reduced' after conflicts were taken into
- account). */
-void grammar_rules_never_reduced_report (const char *message);
+ MESSAGE (which can be 'rule useless in grammar' when invoked after grammar
+ reduction, or 'rule useless in parser due to conflicts' after conflicts
+ were taken into account). */
+void grammar_rules_useless_report (const char *message);
/* Free the packed grammar. */
void grammar_free (void);
projects / bison.git / blobdiff