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;
27import sun.tools.java.*;
28import sun.tools.asm.Assembler;
29
30/**
31 * WARNING: The contents of this source file are not part of any
32 * supported API.  Code that depends on them does so at its own risk:
33 * they are subject to change or removal without notice.
34 */
35public
36class ShiftLeftExpression extends BinaryShiftExpression {
37    /**
38     * constructor
39     */
40    public ShiftLeftExpression(long where, Expression left, Expression right) {
41        super(LSHIFT, where, left, right);
42    }
43
44    /**
45     * Evaluate
46     */
47    Expression eval(int a, int b) {
48        return new IntExpression(where, a << b);
49    }
50    Expression eval(long a, long b) {
51        return new LongExpression(where, a << b);
52    }
53
54    /**
55     * Simplify
56     */
57    Expression simplify() {
58        if (right.equals(0)) {
59            return left;
60        }
61        if (left.equals(0)) {
62            return new CommaExpression(where, right, left).simplify();
63        }
64        return this;
65    }
66
67    /**
68     * Code
69     */
70    void codeOperation(Environment env, Context ctx, Assembler asm) {
71        asm.add(where, opc_ishl + type.getTypeCodeOffset());
72    }
73}
74