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.LispFunction;
29: import org.jatha.dynatype.LispValue;
30:
31: // @date Sat Feb 1 22:18:53 1997
32: /**
33: * LDFC is not in Kogge's book. I use it to activate functions previously
34: * defined by DEFUN. It is exactly like LDF except that it gets the code
35: * from the symbol rather than as the next arg in the C register.
36: *
37: * Uses C, E, S registers.
38: * Modifes S register.
39: * @see SECDMachine
40: * @author Micheal S. Hewett hewett@cs.stanford.edu
41: */
42: class opLDFC extends SECDop {
43: /**
44: * It calls <tt>SECDop()</tt> with the machine argument
45: * and the label of this instruction.
46: * @see SECDMachine
47: */
48: //@author Micheal S. Hewett hewett@cs.stanford.edu
49: public opLDFC(Jatha lisp) {
50: super (lisp, "LDFC");
51: }
52:
53: public void Execute(SECDMachine machine) {
54: /* Make a closure and push it on the S Register. */
55: machine.C.pop(); // pop the LDFC symbol.
56:
57: LispValue code = machine.C.pop().symbol_function();
58: if (code instanceof LispFunction)
59: code = ((LispFunction) code).getCode();
60:
61: machine.S.assign(f_lisp.makeCons(f_lisp.makeCons(code,
62: machine.E.value()), machine.S.value()));
63: }
64:
65: public LispValue grindef(LispValue code, int indentAmount) {
66: indent(indentAmount);
67:
68: System.out.print(functionName);
69: indent(4);
70: code.second().internal_princ(System.out);
71:
72: f_lisp.NEWLINE.internal_princ(System.out);
73:
74: return code.cdr().cdr();
75: }
76: }
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