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 
26 package sun.tools.tree;
27 import sun.tools.java.*;
28 import 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  */
35 public
36 class ShiftRightExpression extends BinaryShiftExpression {
37     /**
38      * constructor
39      */
ShiftRightExpression(long where, Expression left, Expression right)40     public ShiftRightExpression(long where, Expression left, Expression right) {
41         super(RSHIFT, where, left, right);
42     }
43 
44     /**
45      * Evaluate
46      */
eval(int a, int b)47     Expression eval(int a, int b) {
48         return new IntExpression(where, a >> b);
49     }
eval(long a, long b)50     Expression eval(long a, long b) {
51         return new LongExpression(where, a >> b);
52     }
53 
54     /**
55      * Simplify
56      */
simplify()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      */
codeOperation(Environment env, Context ctx, Assembler asm)70     void codeOperation(Environment env, Context ctx, Assembler asm) {
71         asm.add(where, opc_ishr + type.getTypeCodeOffset());
72     }
73 }
74