* src/reader.c (packgram): No longer end `ritem' with a 0

[bison.git] / src / gram.h

diff --git a/src/gram.h b/src/gram.h
index 26682913b5cc3629ec44dcf8084d697581c62d30..88946cffbed60774f3eeda3cfc354dee6c4e5084 100644 (file)
--- a/src/gram.h
+++ b/src/gram.h
@@ -47,7 +47,7 @@
    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.
@@ -81,11 +81,9 @@
    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.  nritems
-   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.
@@ -114,7 +112,16 @@ typedef int item_number_t;
 extern item_number_t *ritem;
 extern int nritems;
 
-extern int start_symbol;
+/* There is weird relationship between item_number_t and
+   token_number_t: we store token_number_t in item_number_t, but in
+   the latter we also store, as negative numbers, the rule numbers.
+
+   Therefore, an token_number_t must be a valid item_number_t, and we
+   sometimes have to perform the converse transformation.  */
+#define token_number_as_item_number(Tok) ((item_number_t) (Tok))
+#define item_number_as_token_number(Ite) ((token_number_t) (Ite))
+
+extern token_number_t start_symbol;
 
 
 typedef struct rule_s
@@ -141,9 +148,6 @@ typedef struct rule_s
 
   const char *action;
   int action_line;
-
-  const char *guard;
-  int guard_line;
 } rule_t;
 
 extern struct rule_s *rules;
@@ -154,25 +158,15 @@ extern symbol_t **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.  */
-typedef short token_number_t;
 extern token_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;
 
 /* 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.  */
-
-extern int error_token_number;
-
 /* Report the length of the RHS. */
 int rule_rhs_length PARAMS ((rule_t *rule));
 
@@ -182,4 +176,10 @@ void ritem_print PARAMS ((FILE *out));
 /* Return the size of the longest rule RHS.  */
 size_t ritem_longest_rhs PARAMS ((void));
 
+/* Dump the grammar. */
+void grammar_dump PARAMS ((FILE *out, const char *title));
+
+/* Free the packed grammar. */
+void grammar_free PARAMS ((void));
+
 #endif /* !GRAM_H_ */