1 /* 2 * Copyright (c) 2014, 2014, 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. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 package org.graalvm.compiler.nodes.calc; 24 25 import org.graalvm.compiler.core.common.calc.Condition; 26 import org.graalvm.compiler.nodes.ValueNode; 27 import org.graalvm.compiler.nodes.ValueNodeInterface; 28 29 import jdk.vm.ci.meta.Constant; 30 import jdk.vm.ci.meta.ConstantReflectionProvider; 31 32 /** 33 * Represents a conversion between primitive types. 34 */ 35 public interface ConvertNode extends ValueNodeInterface { 36 37 ValueNode getValue(); 38 39 Constant convert(Constant c, ConstantReflectionProvider constantReflection); 40 41 Constant reverse(Constant c, ConstantReflectionProvider constantReflection); 42 43 /** 44 * Check whether a conversion is lossless. 45 * 46 * @return true iff reverse(convert(c)) == c for all c 47 */ 48 boolean isLossless(); 49 50 /** 51 * Check whether a conversion preserves comparison order. 52 * 53 * @param op a comparison operator 54 * @return true iff (c1 op c2) == (convert(c1) op convert(c2)) for all c1, c2 55 */ 56 default boolean preservesOrder(Condition op) { 57 return isLossless(); 58 } 59 60 /** 61 * Check whether a conversion preserves comparison order against a particular constant value. 62 * 63 * @param op a comparison operator 64 * @param value 65 * @param constantReflection 66 * @return true iff (c1 op value) == (convert(c1) op convert(value)) for value and all c1 67 */ 68 default boolean preservesOrder(Condition op, Constant value, ConstantReflectionProvider constantReflection) { 69 return preservesOrder(op); 70 } 71 }