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: import org.jatha.dynatype.*;
29:
30: // @date Sat Feb 1 22:18:53 1997
31: /**
32: * opDAP optimizes the (... AP RTN) sequence in (... DAP).
33: * From Section 7.8.3 of Kogge.
34: * @see SECDMachine
35: * @see opAP
36: * @see opRTN
37: * @author Micheal S. Hewett hewett@cs.stanford.edu
38: */
39: class opDAP extends SECDop {
40: /**
41: * It calls <tt>SECDop()</tt> with the machine argument
42: * and the label of this instruction.
43: * @see SECDMachine
44: */
45: //@author Micheal S. Hewett hewett@cs.stanford.edu
46: public opDAP(Jatha lisp) {
47: super (lisp, "DAP");
48: }
49:
50: public void Execute(SECDMachine machine) {
51:
52: LispValue fe = machine.S.pop(); /* (f . e) */
53: LispValue v = machine.S.pop();
54:
55: /*
56: printf("\nAP: fe = "); print(fe);
57: printf("\nAP: v = "); print(v);
58: */
59:
60: machine.C.pop(); // Pop DAD instruction
61:
62: machine.C.assign(fe.car());
63: machine.E.assign(f_lisp.makeCons(v, fe.cdr()));
64: machine.S.assign(f_lisp.NIL);
65: }
66: }
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