1 /*
2 * Copyright (c) 2001, Zoltan Farkas All Rights Reserved.
3 *
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2.1 of the License, or (at your option) any later version.
8 *
9 * This library is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
17 */
18
19 package net.sf.zel.instr.var;
20
21 import net.sf.zel.instr.*;
22 import net.sf.zel.nr.OperableDouble;
23 import net.sf.zel.nr.OperableNumber;
24 import net.sf.zel.vm.*;
25
26 public class LOG extends Instruction
27 {
28 private static final long serialVersionUID = -5424036740352433092L;
29
30 private LOG(){};
31
32 public final void execute(ExecutionContext context) throws ZExecutionException
33 {
34 final double val = ((OperableNumber) context.popSyncStackVal()).doubleValue();
35 context.stack.pop(); // TODO End param Marker Expectation
36 context.stack.push(new OperableDouble(Math.log(val)));
37 context.ip++;
38 }
39 /**
40 * instance
41 */
42 public static final Instruction instance = new LOG();
43 }