Add native Windows binary for bison.

bison/src/bison/2.4.1/bison-2.4.1-src/src/gram.h

+/* Data definitions for internal representation of Bison's input.
+
+   Copyright (C) 1984, 1986, 1989, 1992, 2001, 2002, 2003, 2004, 2005, 2006
+   2007 Free Software Foundation, Inc.
+
+   This file is part of Bison, the GNU Compiler Compiler.
+
+   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 3 of the License, or
+   (at your option) any later version.
+
+   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 this program.  If not, see <http://www.gnu.org/licenses/>.  */
+
+#ifndef GRAM_H_
+# define GRAM_H_
+
+/* Representation of the grammar rules:
+
+   NTOKENS is the number of tokens, and NVARS is the number of
+   variables (nonterminals).  NSYMS is the total number, ntokens +
+   nvars.
+
+   Each symbol (either token or variable) receives a symbol number.
+   Numbers 0 to NTOKENS - 1 are for tokens, and NTOKENS to NSYMS - 1
+   are for variables.  Symbol number zero is the end-of-input token.
+   This token is counted in ntokens.  The true number of token values
+   assigned is NTOKENS reduced by one for each alias declaration.
+
+   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,
+   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...
+
+   Internally, we cannot use the number 0 for a rule because for
+   instance RITEM stores both symbol (the RHS) and rule numbers: the
+   symbols are shorts >= 0, and rule number are stored negative.
+   Therefore 0 cannot be used, since it would be both the rule number
+   0, and the token $end).
+
+   Actions are accessed via the rule number.
+
+   The rules themselves are described by several arrays: amongst which
+   RITEM, and RULES.
+
+   RULES is an array of rules, whose members are:
+
+   RULES[R].lhs -- the symbol of the left hand side of rule R.
+
+   RULES[R].rhs -- the index in RITEM of the beginning of the portion
+   for rule R.
+
+   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
+   need to distinguish one from the other when reducing: a symbol used
+   in a %prec is not useless.
+
+   RULES[R].assoc -- the associativity of R.
+
+   RULES[R].dprec -- the dynamic precedence level of R (for GLR
+   parsing).
+
+   RULES[R].merger -- index of merging function for R (for GLR
+   parsing).
+
+   RULES[R].line -- the line where R was defined.
+
+   RULES[R].useful -- true iff the rule is used (i.e., false if thrown
+   away by reduce).
+
+   The right hand side is stored as symbol numbers in a portion of
+   RITEM.
+
+   The length of the portion is one greater than the number of symbols
+   in the rule's right hand side.  The last element in the portion
+   contains minus R, which identifies it as the end of a portion and
+   says which rule it is for.
+
+   The portions of RITEM come in order of increasing rule number.
+   NRITEMS is the total length of RITEM.  Each element of RITEM is
+   called an "item" and its index in RITEM is an item number.
+
+   Item numbers are used in the finite state machine to represent
+   places that parsing can get to.
+
+   SYMBOLS[I]->prec records the precedence level of each symbol.
+
+   Precedence levels are assigned in increasing order starting with 1
+   so that numerically higher precedence values mean tighter binding
+   as they ought to.  Zero as a symbol or rule's precedence means none
+   is assigned.
+
+   Associativities are recorded similarly in SYMBOLS[I]->assoc.  */
+
+# include "location.h"
+# include "symtab.h"
+
+# 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;
+
+/* There is weird relationship between OT1H item_number and OTOH
+   symbol_number and rule_number: we store the latter in
+   item_number.  symbol_number values are stored as-is, while
+   the negation of (rule_number + 1) is stored.
+
+   Therefore, a symbol_number must be a valid item_number, and we
+   sometimes have to perform the converse transformation.  */
+
+static inline item_number
+symbol_number_as_item_number (symbol_number sym)
+{
+  return sym;
+}
+
+static inline symbol_number
+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
+rule_number_as_item_number (rule_number r)
+{
+  return -1 - r;
+}
+
+static inline rule_number
+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.  |
+`--------*/
+
+typedef struct
+{
+  /* The number of the rule in the source.  It is usually the index in
+     RULES too, except if there are useless rules.  */
+  rule_number user_number;
+
+  /* The index in RULES.  Usually the rule number in the source,
+     except if some rules are useless.  */
+  rule_number number;
+
+  symbol *lhs;
+  item_number *rhs;
+
+  /* This symbol provides both the associativity, and the precedence. */
+  symbol *prec;
+
+  int dprec;
+  int merger;
+
+  /* This symbol was attached to the rule via %prec. */
+  symbol *precsym;
+
+  location location;
+  bool useful;
+
+  const char *action;
+  location action_location;
+} rule;
+
+extern rule *rules;
+
+/* A function that selects a rule.  */
+typedef bool (*rule_filter) (rule *);
+
+/* 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 *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 *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 *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_xml (rule *r, FILE *out, int level);
+
+/* Return the length of the RHS.  */
+int rule_rhs_length (rule *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);
+
+
+
+
+/* Table of the symbols, indexed by the symbol number. */
+extern symbol **symbols;
+
+/* TOKEN_TRANSLATION -- a table indexed by a token number as returned
+   by the user's yylex routine, it yields the internal token number
+   used by the parser and throughout bison.  */
+extern symbol_number *token_translations;
+extern int max_user_token_number;
+
+
+
+/* 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 that match FILTER on OUT under TITLE.  */
+void grammar_rules_partial_print (FILE *out, const char *title,
+                                  rule_filter filter);
+
+/* 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 `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);
+
+#endif /* !GRAM_H_ */