/* Data definitions for internal representation of bison's input,
- Copyright 1984, 1986, 1989, 1992, 2001, 2002
+ Copyright (C) 1984, 1986, 1989, 1992, 2001, 2002
Free Software Foundation, Inc.
This file is part of Bison, the GNU Compiler Compiler.
Therefore 0 cannot be used, since it would be both the rule number
0, and the token EOF).
- Actions and guards are accessed via the rule number.
+ 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 struct rule_s, which members are:
- RULES[R].lhs -- the symbol number of the left hand side of rule R.
- If -1, the rule has been thrown out by reduce.c and should be
- ignored.
+ 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 precedence level of R.
+ RULES[R].prec -- the symbol providing the precedence level of R.
- RULES[R].precsym -- the symbol-number of the symbol in %prec for R
- (if any).
+ 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.
+ 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.
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 and
- are followed by an element which is zero to mark the end. nitems
- is the total length of ritem, not counting the final zero. Each
- element of RITEM is called an "item" and its index in RITEM is an
- item number.
+ 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.
Associativities are recorded similarly in SYMBOLS[I]->assoc. */
+# include "location.h"
+# include "symtab.h"
-#define ISTOKEN(s) ((s) < ntokens)
-#define ISVAR(s) ((s) >= ntokens)
+# define ISTOKEN(s) ((s) < ntokens)
+# define ISVAR(s) ((s) >= ntokens)
-extern int nitems;
-extern int nrules;
extern int nsyms;
extern int ntokens;
extern int nvars;
-extern short *ritem;
-extern int nritems;
+typedef int item_number_t;
+# define ITEM_NUMBER_MAX ((item_number_t) INT_MAX)
+extern item_number_t *ritem;
+extern unsigned int nritems;
-extern int start_symbol;
+/* There is weird relationship between OT1H item_number_t and OTOH
+ symbol_number_t and rule_number_t: we store the latter in
+ item_number_t. symbol_number_t are stored as are, while
+ the negation of rule_number_t are stored.
+
+ Therefore, an symbol_number_t must be a valid item_number_t, and we
+ sometimes have to perform the converse transformation. */
+# define symbol_number_as_item_number(Tok) ((item_number_t) (Tok))
+# define item_number_as_symbol_number(Ite) ((symbol_number_t) (Ite))
+
+extern symbol_number_t start_symbol;
+
+/* Rules numbers. */
+typedef short rule_number_t;
+# define RULE_NUMBER_MAX ((rule_number_t) SHRT_MAX)
+extern rule_number_t nrules;
+# define int_of_rule_number(RNum) ((int) (RNum))
+# define item_number_of_rule_number(RNum) ((item_number_t) (- RNum))
+# define rule_number_of_item_number(INum) ((rule_number_t) (- INum))
-/* Associativity values for tokens and rules. */
-typedef enum
-{
- right_assoc,
- left_assoc,
- non_assoc
-} associativity;
+/*--------.
+| Rules. |
+`--------*/
typedef struct rule_s
{
/* The number of the rule in the source. It is usually the index in
RULES too, except if there are useless rules. */
- short number;
-
- short lhs;
- short *rhs;
- short prec;
- short precsym;
- associativity assoc;
- short line;
+ rule_number_t user_number;
+
+ /* The index in RULES. Usually the rule number in the source,
+ except if some rules are useless. */
+ rule_number_t number;
+
+ symbol_t *lhs;
+ item_number_t *rhs;
+
+ /* This symbol provides both the associativity, and the precedence. */
+ symbol_t *prec;
+
+ short dprec;
+ short merger;
+
+ /* This symbol was attached to the rule via %prec. */
+ symbol_t *precsym;
+
+ location_t location;
bool useful;
const char *action;
- short action_line;
-
- const char *guard;
- short guard_line;
+ location_t action_location;
} rule_t;
extern struct rule_s *rules;
/* Table of the symbols, indexed by the symbol number. */
-extern struct bucket **symbols;
-
-/* token translation 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_t **symbols;
-extern short *token_translations;
+/* 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_t *token_translations;
extern int max_user_token_number;
-/* SEMANTIC_PARSER is nonzero if the input file says to use the hairy
- parser that provides for semantic error recovery. If it is zero,
- the yacc-compatible simplified parser is used. */
-extern int semantic_parser;
+/* 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;
-/* ERROR_TOKEN_NUMBER is the token number of the error token. */
+/* Return the length of the RHS. */
+int rule_rhs_length PARAMS ((rule_t *rule));
-extern int error_token_number;
+/* Print this RULE's RHS on OUT. */
+void rule_rhs_print PARAMS ((rule_t *rule, FILE *out));
-/* Report the length of the RHS. */
-int rule_rhs_length PARAMS ((rule_t *rule));
+/* Print this RULE on OUT. */
+void rule_print PARAMS ((rule_t *rule, FILE *out));
/* Dump RITEM for traces. */
void ritem_print PARAMS ((FILE *out));
/* Return the size of the longest rule RHS. */
size_t ritem_longest_rhs PARAMS ((void));
+/* Print the grammar's rules numbers from BEGIN (inclusive) to END
+ (exclusive) on OUT under TITLE. */
+void grammar_rules_partial_print PARAMS ((FILE *out, const char *title,
+ rule_number_t begin,
+ rule_number_t end));
+
+/* Print the grammar's rules on OUT. */
+void grammar_rules_print PARAMS ((FILE *out));
+
+/* Dump the grammar. */
+void grammar_dump PARAMS ((FILE *out, const char *title));
+
+/* Free the packed grammar. */
+void grammar_free PARAMS ((void));
+
#endif /* !GRAM_H_ */
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