X-Git-Url: https://git.saurik.com/bison.git/blobdiff_plain/c29240e74b6f81a3bc37a3b0e718479b2e7f16c3..c0ad8bf3c2fb46f001bb24ac98a72b8bfb3a77ce:/src/closure.h

diff --git a/src/closure.h b/src/closure.h
index 2325e7c4..e47d8d38 100644
--- a/src/closure.h
+++ b/src/closure.h
@@ -1,5 +1,5 @@
 /* Subroutines for bison
-   Copyright (C) 1984, 1989, 2000 Free Software Foundation, Inc.
+   Copyright (C) 1984, 1989, 2000, 2001, 2002  Free Software Foundation, Inc.
 
    This file is part of Bison, the GNU Compiler Compiler.
 
@@ -18,8 +18,8 @@
    Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
    02111-1307, USA.  */
 
-
-/* Subroutines of file LR0.c. */
+#ifndef CLOSURE_H_
+# define CLOSURE_H_
 
 /* Allocates the itemset and ruleset vectors, and precomputes useful
    data so that closure can be called.  n is the number of elements to
@@ -28,22 +28,28 @@
 void new_closure PARAMS ((int n));
 
 
-/* Given a vector of item numbers ITEMS, of length N, set up ruleset
-   and itemset to indicate what rules could be run and which items
-   could be accepted when those items are the active ones.
+/* Given the kernel (aka core) of a state (a vector of item numbers
+   ITEMS, of length N), set up RULESET and ITEMSET to indicate what
+   rules could be run and which items could be accepted when those
+   items are the active ones.
 
-   ruleset contains a bit for each rule.  closure sets the bits for
+   RULESET contains a bit for each rule.  CLOSURE sets the bits for
    all rules which could potentially describe the next input to be
    read.
 
-   itemset is a vector of item numbers; itemsetend points to just
-   beyond the end of the part of it that is significant.  closure
-   places there the indices of all items which represent units of
-   input that could arrive next.  */
+   ITEMSET is a vector of item numbers; NITEMSET is its size
+   (actually, points to just beyond the end of the part of it that is
+   significant).  CLOSURE places there the indices of all items which
+   represent units of input that could arrive next.  */
 
-void closure PARAMS ((short *items, int n));
+void closure PARAMS ((item_number_t *items, int n));
 
 
-/* Frees itemset, ruleset and internal data.  */
+/* Frees ITEMSET, RULESET and internal data.  */
 
 void free_closure PARAMS ((void));
+
+extern item_number_t *itemset;
+extern int nritemset;
+
+#endif /* !CLOSURE_H_ */