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 UnsignedShiftRightExpression extends BinaryShiftExpression { 37 /** 38 * constructor 39 */ UnsignedShiftRightExpression(long where, Expression left, Expression right)40 public UnsignedShiftRightExpression(long where, Expression left, Expression right) { 41 super(URSHIFT, 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_iushr + type.getTypeCodeOffset()); 72 } 73 } 74