X-Git-Url: https://git.saurik.com/bison.git/blobdiff_plain/f6fbd3da9d1366ccaa0163c6c93dde11e5720262..0d40b36417759153678ed0ad125bc912884f602d:/src/gram.h?ds=sidebyside diff --git a/src/gram.h b/src/gram.h index f6b2707e..92b1af63 100644 --- a/src/gram.h +++ b/src/gram.h @@ -1,24 +1,22 @@ /* Data definitions for internal representation of Bison's input. - Copyright (C) 1984, 1986, 1989, 1992, 2001, 2002, 2003, 2004 - Free Software Foundation, Inc. + Copyright (C) 1984, 1986, 1989, 1992, 2001-2007, 2009-2015 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 . */ #ifndef GRAM_H_ # define GRAM_H_ @@ -37,7 +35,7 @@ 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... @@ -63,7 +61,7 @@ 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. @@ -107,14 +105,15 @@ # include "location.h" # include "symtab.h" -# define ISTOKEN(i) ((i) < ntokens) -# define ISVAR(i) ((i) >= 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; @@ -138,8 +137,15 @@ item_number_as_symbol_number (item_number i) return i; } +static inline bool +item_number_is_symbol_number (item_number i) +{ + return i >= 0; +} + /* Rule numbers. */ typedef int rule_number; +# define RULE_NUMBER_MAX INT_MAX extern rule_number nrules; static inline item_number @@ -154,6 +160,11 @@ item_number_as_rule_number (item_number i) return -1 - i; } +static inline bool +item_number_is_rule_number (item_number i) +{ + return i < 0; +} /*--------. | Rules. | @@ -183,6 +194,7 @@ typedef struct location location; bool useful; + bool is_predicate; const char *action; location action_location; @@ -191,31 +203,31 @@ typedef struct 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); @@ -237,22 +249,23 @@ 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);