1 /* 2 * Copyright (c) 2014, 2018, 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 24 25 package org.graalvm.compiler.nodes.calc; 26 27 import org.graalvm.compiler.core.common.calc.CanonicalCondition; 28 import org.graalvm.compiler.nodes.ValueNode; 29 import org.graalvm.compiler.nodes.ValueNodeInterface; 30 31 import jdk.vm.ci.meta.Constant; 32 import jdk.vm.ci.meta.ConstantReflectionProvider; 33 34 /** 35 * Represents a conversion between primitive types. 36 */ 37 public interface ConvertNode extends ValueNodeInterface { 38 getValue()39 ValueNode getValue(); 40 convert(Constant c, ConstantReflectionProvider constantReflection)41 Constant convert(Constant c, ConstantReflectionProvider constantReflection); 42 reverse(Constant c, ConstantReflectionProvider constantReflection)43 Constant reverse(Constant c, ConstantReflectionProvider constantReflection); 44 45 /** 46 * Checks whether a null check may skip the conversion. This is true if in the conversion NULL 47 * is converted to NULL and if it is the only value converted to NULL. 48 * 49 * @return whether a null check may skip the conversion 50 */ mayNullCheckSkipConversion()51 boolean mayNullCheckSkipConversion(); 52 53 /** 54 * Check whether a conversion is lossless. 55 * 56 * @return true iff reverse(convert(c)) == c for all c 57 */ isLossless()58 boolean isLossless(); 59 60 /** 61 * Check whether a conversion preserves comparison order. 62 * 63 * @param op a comparison operator 64 * @return true iff (c1 op c2) == (convert(c1) op convert(c2)) for all c1, c2 65 */ preservesOrder(CanonicalCondition op)66 default boolean preservesOrder(CanonicalCondition op) { 67 return isLossless(); 68 } 69 70 /** 71 * Check whether a conversion preserves comparison order against a particular constant value. 72 * 73 * @param op a comparison operator 74 * @param value 75 * @param constantReflection 76 * @return true iff (c1 op value) == (convert(c1) op convert(value)) for value and all c1 77 */ preservesOrder(CanonicalCondition op, Constant value, ConstantReflectionProvider constantReflection)78 default boolean preservesOrder(CanonicalCondition op, Constant value, ConstantReflectionProvider constantReflection) { 79 return preservesOrder(op); 80 } 81 } 82