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; 27 28import sun.tools.java.*; 29import sun.tools.asm.Assembler; 30import sun.tools.asm.Label; 31 32/** 33 * WARNING: The contents of this source file are not part of any 34 * supported API. Code that depends on them does so at its own risk: 35 * they are subject to change or removal without notice. 36 */ 37public 38class NotEqualExpression extends BinaryEqualityExpression { 39 /** 40 * constructor 41 */ 42 public NotEqualExpression(long where, Expression left, Expression right) { 43 super(NE, where, left, right); 44 } 45 46 /** 47 * Evaluate 48 */ 49 Expression eval(int a, int b) { 50 return new BooleanExpression(where, a != b); 51 } 52 Expression eval(long a, long b) { 53 return new BooleanExpression(where, a != b); 54 } 55 Expression eval(float a, float b) { 56 return new BooleanExpression(where, a != b); 57 } 58 Expression eval(double a, double b) { 59 return new BooleanExpression(where, a != b); 60 } 61 Expression eval(boolean a, boolean b) { 62 return new BooleanExpression(where, a != b); 63 } 64 65 /** 66 * Simplify 67 */ 68 Expression simplify() { 69 if (left.isConstant() && !right.isConstant()) { 70 return new NotEqualExpression(where, right, left); 71 } 72 return this; 73 } 74 75 /** 76 * Code 77 */ 78 void codeBranch(Environment env, Context ctx, Assembler asm, Label lbl, boolean whenTrue) { 79 left.codeValue(env, ctx, asm); 80 switch (left.type.getTypeCode()) { 81 case TC_BOOLEAN: 82 case TC_INT: 83 if (!right.equals(0)) { 84 right.codeValue(env, ctx, asm); 85 asm.add(where, whenTrue ? opc_if_icmpne : opc_if_icmpeq, lbl, whenTrue); 86 return; 87 } 88 break; 89 case TC_LONG: 90 right.codeValue(env, ctx, asm); 91 asm.add(where, opc_lcmp); 92 break; 93 case TC_FLOAT: 94 right.codeValue(env, ctx, asm); 95 asm.add(where, opc_fcmpl); 96 break; 97 case TC_DOUBLE: 98 right.codeValue(env, ctx, asm); 99 asm.add(where, opc_dcmpl); 100 break; 101 case TC_ARRAY: 102 case TC_CLASS: 103 case TC_NULL: 104 if (right.equals(0)) { 105 asm.add(where, whenTrue ? opc_ifnonnull : opc_ifnull, lbl, whenTrue); 106 } else { 107 right.codeValue(env, ctx, asm); 108 asm.add(where, whenTrue ? opc_if_acmpne : opc_if_acmpeq, lbl, whenTrue); 109 } 110 return; 111 default: 112 throw new CompilerError("Unexpected Type"); 113 } 114 asm.add(where, whenTrue ? opc_ifne : opc_ifeq, lbl, whenTrue); 115 } 116} 117