* doc/bison.texinfo (Stack Overflow): xref to Recursion.

[bison.git] / src / lalr.h

diff --git a/src/lalr.h b/src/lalr.h
index 4f11cc51b0baf188bdf4100bb67e3328d5f973c3..7edbbe8a8f8766b3b9ae1859577288a5a47e8b41 100644 (file)
--- a/src/lalr.h
+++ b/src/lalr.h
@@ -1,5 +1,5 @@
 /* Compute look-ahead criteria for bison,
-   Copyright (C) 1984, 1986, 1989 Free Software Foundation, Inc.
+   Copyright (C) 1984, 1986, 1989, 2000, 2002 Free Software Foundation, Inc.
 
    This file is part of Bison, the GNU Compiler Compiler.
 
@@ -21,60 +21,45 @@
 #ifndef LALR_H_
 # define LALR_H_
 
+# include "bitset.h"
+# include "bitsetv.h"
+
+/* Import the definition of CORE, TRANSITIONS and REDUCTIONS. */
+# include "state.h"
+
+/* Import the definition of RULE_T. */
+# include "gram.h"
+
 /* Compute how to make the finite state machine deterministic; find
    which rules need lookahead in each state, and which lookahead
    tokens they accept.  */
 
 void lalr PARAMS ((void));
 
+/* Release the information related to lookaheads.  Can be performed
+   once the action tables are computed.  */
 
-/* lalr() builds these data structures. */
-
-/* goto_map, from_state and to_state --record each shift transition
-   which accepts a variable (a nonterminal).
-
-   from_state[t] is the state number which a transition leads from and
-   to_state[t] is the state number it leads to.  All the transitions
-   that accept a particular variable are grouped together and
-   goto_map[i - ntokens] is the index in from_state and to_state of
-   the first of them.  */
-
-extern short *goto_map;
-extern short *from_state;
-extern short *to_state;
-
-/* CONSISTENT[S] is nonzero if no lookahead is needed to decide what
-   to do in state S.  */
-
-extern char *consistent;
-
+void lalr_free PARAMS ((void));
 
-/* LARULENO is a vector which records the rules that need lookahead in
-   various states.  The elements of LARULENO that apply to state S are
-   those from LOOKAHEADS[S] through LOOKAHEADS[S+1]-1.  Each element
-   of LARULENO is a rule number.
 
-   If LR is the length of LAruleno, then a number from 0 to LR-1 can
-   specify both a rule and a state where the rule might be applied.
-   */
-
-extern short *LAruleno;
+/* lalr() builds these data structures. */
 
-/* LA is a lr by ntokens matrix of bits.  LA[l, i] is 1 if the rule
-   LAruleno[l] is applicable in the appropriate state when the next
-   token is symbol i.  If LA[l, i] and LA[l, j] are both 1 for i != j,
-   it is a conflict.  */
+/* GOTO_MAP, FROM_STATE and TO_STATE -- record each shift transition
+   which accepts a variable (a nonterminal).
 
-extern unsigned *LA;
+   FROM_STATE[T] -- state number which a transition leads from.
+   TO_STATE[T] -- state number it leads to.
 
+   All the transitions that accept a particular variable are grouped
+   together and GOTO_MAP[I - NTOKENS] is the index in FROM_STATE and
+   TO_STATE of the first of them.  */
 
-extern int tokensetsize;
-extern short *lookaheads;
-extern short *accessing_symbol;
-extern core **state_table;
-extern shifts **shift_table;
-extern reductions **reduction_table;
+typedef short goto_number_t;
+# define GOTO_NUMBER_MAX ((goto_number_t) INT_MAX)
 
+extern goto_number_t *goto_map;
+extern state_number_t *from_state;
+extern state_number_t *to_state;
 
 
 #endif /* !LALR_H_ */