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 
28 import sun.tools.java.*;
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 BinaryShiftExpression extends BinaryExpression {
37     /**
38      * constructor
39      */
BinaryShiftExpression(int op, long where, Expression left, Expression right)40     public BinaryShiftExpression(int op, long where, Expression left, Expression right) {
41         super(op, where, left.type, left, right);
42     }
43 
44     /**
45      * Evaluate the expression
46      */
eval()47     Expression eval() {
48         // The eval code in BinaryExpression.java only works correctly
49         // for arithmetic expressions.  For shift expressions, we get cases
50         // where the left and right operand may legitimately be of mixed
51         // types (long and int).  This is a fix for 4082814.
52         if (left.op == LONGVAL && right.op == INTVAL) {
53             return eval(((LongExpression)left).value,
54                         ((IntExpression)right).value);
55         }
56 
57         // Delegate the rest of the cases to our parent, so as to minimize
58         // impact on existing behavior.
59         return super.eval();
60     }
61 
62     /**
63      * Select the type
64      */
selectType(Environment env, Context ctx, int tm)65     void selectType(Environment env, Context ctx, int tm) {
66         if (left.type == Type.tLong) {
67             type = Type.tLong;
68         } else if (left.type.inMask(TM_INTEGER)) {
69             type = Type.tInt;
70             left = convert(env, ctx, type, left);
71         } else {
72             type = Type.tError;
73         }
74         if (right.type.inMask(TM_INTEGER)) {
75             right = new ConvertExpression(where, Type.tInt, right);
76         } else {
77             right = convert(env, ctx, Type.tInt, right);
78         }
79     }
80 }
81