1/*
2 * Copyright (c) 1994, 2003, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.  Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26package sun.tools.tree;
27
28import sun.tools.java.*;
29import sun.tools.asm.Assembler;
30
31/**
32 * WARNING: The contents of this source file are not part of any
33 * supported API.  Code that depends on them does so at its own risk:
34 * they are subject to change or removal without notice.
35 */
36public
37class SubtractExpression extends BinaryArithmeticExpression {
38    /**
39     * constructor
40     */
41    public SubtractExpression(long where, Expression left, Expression right) {
42        super(SUB, where, left, right);
43    }
44
45    /**
46     * Evaluate
47     */
48    Expression eval(int a, int b) {
49        return new IntExpression(where, a - b);
50    }
51    Expression eval(long a, long b) {
52        return new LongExpression(where, a - b);
53    }
54    Expression eval(float a, float b) {
55        return new FloatExpression(where, a - b);
56    }
57    Expression eval(double a, double b) {
58        return new DoubleExpression(where, a - b);
59    }
60
61    /**
62     * Simplify
63     */
64    Expression simplify() {
65        // Can't simplify floating point subtract because of -0.0 strangeness
66        if (type.inMask(TM_INTEGER)) {
67            if (left.equals(0)) {
68                return new NegativeExpression(where, right);
69            }
70            if (right.equals(0)) {
71                return left;
72            }
73        }
74        return this;
75    }
76
77    /**
78     * Code
79     */
80    void codeOperation(Environment env, Context ctx, Assembler asm) {
81        asm.add(where, opc_isub + type.getTypeCodeOffset());
82    }
83}
84