2007-11-08 Paolo Bonzini <bonzini@gnu.org>

[bison.git] / src / gram.h

diff --git a/src/gram.h b/src/gram.h
index c698846048d306918e989271a96a0c5d56470217..bf60e0a3ec983006d37545a23e5977e2b1089d3a 100644 (file)
--- a/src/gram.h
+++ b/src/gram.h
@@ -1,23 +1,22 @@
-/* Data definitions for internal representation of bison's input,
-   Copyright (C) 1984, 1986, 1989, 1992, 2001, 2002
-   Free Software Foundation, Inc.
+/* 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 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
    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
    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_
 
 #ifndef GRAM_H_
 # define GRAM_H_


@@ -36,23 +35,23 @@
 
    The rules receive rule numbers 1 to NRULES in the order they are
    written.  More precisely Bison augments the grammar with the
 
    The rules receive rule numbers 1 to NRULES in the order they are
    written.  More precisely Bison augments the grammar with the

-   initial rule, `$axiom: START-SYMBOL EOF', which is numbered 1, all
-   the user rules are 2, 3 etc.  Each time a rule number is presented
-   to the user, we subtract 1, so *displayed* rule numbers are 0, 1,
-   2...
+   initial rule, `$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
 
    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 EOF).
+   0, and the token $end).

 
 

-   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.
 
 
    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 is an array of rules, whose members are:

 
    RULES[R].lhs -- the symbol of the left hand side of rule R.
 
 
    RULES[R].lhs -- the symbol of the left hand side of rule R.
 


@@ -68,9 +67,15 @@
 
    RULES[R].assoc -- the associativity of R.
 
 
    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].line -- the line where R was defined.
 

-   RULES[R].useful -- TRUE iff the rule is used (i.e., FALSE if thrown
+   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
    away by reduce).
 
    The right hand side is stored as symbol numbers in a portion of


@@ -81,11 +86,9 @@
    contains minus R, which identifies it as the end of a portion and
    says which rule it is for.
 
    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.
 
    Item numbers are used in the finite state machine to represent
    places that parsing can get to.


@@ -99,85 +102,174 @@
 
    Associativities are recorded similarly in SYMBOLS[I]->assoc.  */
 
 
    Associativities are recorded similarly in SYMBOLS[I]->assoc.  */
 

-#include "symtab.h"
+# 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 nitems;
-extern int nrules;

 extern int nsyms;
 extern int ntokens;
 extern int nvars;
 
 extern int nsyms;
 extern int ntokens;
 extern int nvars;
 

-extern short *ritem;
-extern int nritems;
+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;
+}

 
 

-extern int start_symbol;
+/* Rule numbers.  */
+typedef int rule_number;
+#define RULE_NUMBER_MAX INT_MAX
+extern rule_number nrules;

 
 

-typedef struct rule_s
+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.  */
 {
   /* The number of the rule in the source.  It is usually the index in
      RULES too, except if there are useless rules.  */

-  short user_number;
+  rule_number user_number;

 
   /* The index in RULES.  Usually the rule number in the source,
      except if some rules are useless.  */
 
   /* The index in RULES.  Usually the rule number in the source,
      except if some rules are useless.  */

-  short number;
+  rule_number number;

 
 

-  bucket *lhs;
-  short *rhs;
+  symbol *lhs;
+  item_number *rhs;

 
   /* This symbol provides both the associativity, and the precedence. */
 
   /* This symbol provides both the associativity, and the precedence. */

-  bucket *prec;
+  symbol *prec;
+
+  int dprec;
+  int merger;

 
   /* This symbol was attached to the rule via %prec. */
 
   /* This symbol was attached to the rule via %prec. */

-  bucket *precsym;
+  symbol *precsym;

 
 

-  short line;
+  location location;

   bool useful;
 
   const char *action;
   bool useful;
 
   const char *action;

-  short action_line;
+  location action_location;
+} rule;

 
 

-  const char *guard;
-  short guard_line;
-} rule_t;
+extern rule *rules;

 
 

-extern struct rule_s *rules;
+/* A function that selects a rule.  */
+typedef bool (*rule_filter) (rule *);

 
 

-/* Table of the symbols, indexed by the symbol number. */
-extern struct bucket **symbols;
+/* Return true IFF the rule has a `number' smaller than NRULES.  */
+bool rule_useful_p (rule *r);

 
 

-/* 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.  */
+/* Return true IFF the rule has a `number' higher than NRULES.  */
+bool rule_useless_p (rule *r);

 
 

-extern short *token_translations;
-extern int max_user_token_number;
+/* 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);

 
 

-/* 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.  */
+/* 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);

 
 

-extern int semantic_parser;
+/* Return the length of the RHS.  */
+int rule_rhs_length (rule *r);

 
 

-/* PURE_PARSER is nonzero if should generate a parser that is all pure
-   and reentrant.  */
+/* Print this rule's RHS on OUT.  */
+void rule_rhs_print (rule *r, FILE *out);

 
 

-extern int pure_parser;
+/* Print this rule on OUT.  */
+void rule_print (rule *r, FILE *out);

 
 

-/* 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));
+
+/* 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. */
 
 /* Dump RITEM for traces. */

-void ritem_print PARAMS ((FILE *out));
+void ritem_print (FILE *out);

 
 /* Return the size of the longest rule RHS.  */
 
 /* Return the size of the longest rule RHS.  */

-size_t ritem_longest_rhs PARAMS ((void));
+size_t ritem_longest_rhs (void);
+
+/* Print the grammar's rules numbers from BEGIN (inclusive) to END
+   (exclusive) on OUT under TITLE.  */
+void grammar_rules_partial_print (FILE *out, const char *title,
+                                 rule_filter filter);
+void grammar_rules_partial_print_xml (FILE *out, int level, bool rtag,
+                                     rule_filter filter);
+
+/* Print the grammar's rules on OUT.  */
+void grammar_rules_print (FILE *out);
+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);
+
+/* Free the packed grammar. */
+void grammar_free (void);

 
 #endif /* !GRAM_H_ */
 
 #endif /* !GRAM_H_ */