01: /*
02: * Copyright 1994-2003 Sun Microsystems, Inc. All Rights Reserved.
03: * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
04: *
05: * This code is free software; you can redistribute it and/or modify it
06: * under the terms of the GNU General Public License version 2 only, as
07: * published by the Free Software Foundation. Sun designates this
08: * particular file as subject to the "Classpath" exception as provided
09: * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
22: * CA 95054 USA or visit www.sun.com if you need additional information or
23: * have any questions.
24: */
25:
26: package sun.tools.tree;
27:
28: import sun.tools.java.*;
29: import 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: */
36: public class ShiftLeftExpression extends BinaryShiftExpression {
37: /**
38: * constructor
39: */
40: public ShiftLeftExpression(long where, Expression left,
41: Expression right) {
42: super (LSHIFT, 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:
52: Expression eval(long a, long b) {
53: return new LongExpression(where, a << b);
54: }
55:
56: /**
57: * Simplify
58: */
59: Expression simplify() {
60: if (right.equals(0)) {
61: return left;
62: }
63: if (left.equals(0)) {
64: return new CommaExpression(where, right, left).simplify();
65: }
66: return this ;
67: }
68:
69: /**
70: * Code
71: */
72: void codeOperation(Environment env, Context ctx, Assembler asm) {
73: asm.add(where, opc_ishl + type.getTypeCodeOffset());
74: }
75: }
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