01: /*
02: * Jatha - a Common LISP-compatible LISP library in Java.
03: * Copyright (C) 1997-2005 Micheal Scott Hewett
04: *
05: * This library is free software; you can redistribute it and/or
06: * modify it under the terms of the GNU Lesser General Public
07: * License as published by the Free Software Foundation; either
08: * version 2.1 of the License, or (at your option) any later version.
09: *
10: * This library is distributed in the hope that it will be useful,
11: * but WITHOUT ANY WARRANTY; without even the implied warranty of
12: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13: * Lesser General Public License for more details.
14: *
15: * You should have received a copy of the GNU Lesser General Public
16: * License along with this library; if not, write to the Free Software
17: * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18: *
19: *
20: * For further information, please contact Micheal Hewett at
21: * hewett@cs.stanford.edu
22: *
23: */
24:
25: package org.jatha.machine;
26:
27: import org.jatha.Jatha;
28:
29: // @date Sat Feb 1 22:18:53 1997
30: /**
31: * opJOIN terminates a branch of an IF-ELSE statement
32: * by taking the topmost entry from the D register and
33: * storing it in the C register.
34: * @see SECDMachine
35: * @author Micheal S. Hewett hewett@cs.stanford.edu
36: */
37: class opJOIN extends SECDop {
38: /**
39: * It calls <tt>SECDop()</tt> with the machine argument
40: * and the label of this instruction.
41: * @see SECDMachine
42: */
43: public opJOIN(Jatha lisp) {
44: super (lisp, "JOIN");
45: }
46:
47: public void Execute(SECDMachine machine) {
48:
49: machine.C.assign(machine.D.pop());
50: /*
51: // having trouble printing circular lists.
52: printf("\n JOIN: C is now: "); machine.C.print(System.out);
53: System.out.print("\n D is now: "); machine.D.print(System.out);
54: System.out.flush();
55: */
56: }
57: }
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