| /* |
| * Copyright (c) 2014, 2014, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| package org.graalvm.compiler.nodes.calc; |
| |
| import org.graalvm.compiler.core.common.calc.Condition; |
| import org.graalvm.compiler.nodes.ValueNode; |
| import org.graalvm.compiler.nodes.ValueNodeInterface; |
| |
| import jdk.vm.ci.meta.Constant; |
| import jdk.vm.ci.meta.ConstantReflectionProvider; |
| |
| /** |
| * Represents a conversion between primitive types. |
| */ |
| public interface ConvertNode extends ValueNodeInterface { |
| |
| ValueNode getValue(); |
| |
| Constant convert(Constant c, ConstantReflectionProvider constantReflection); |
| |
| Constant reverse(Constant c, ConstantReflectionProvider constantReflection); |
| |
| /** |
| * Check whether a conversion is lossless. |
| * |
| * @return true iff reverse(convert(c)) == c for all c |
| */ |
| boolean isLossless(); |
| |
| /** |
| * Check whether a conversion preserves comparison order. |
| * |
| * @param op a comparison operator |
| * @return true iff (c1 op c2) == (convert(c1) op convert(c2)) for all c1, c2 |
| */ |
| default boolean preservesOrder(Condition op) { |
| return isLossless(); |
| } |
| |
| /** |
| * Check whether a conversion preserves comparison order against a particular constant value. |
| * |
| * @param op a comparison operator |
| * @param value |
| * @param constantReflection |
| * @return true iff (c1 op value) == (convert(c1) op convert(value)) for value and all c1 |
| */ |
| default boolean preservesOrder(Condition op, Constant value, ConstantReflectionProvider constantReflection) { |
| return preservesOrder(op); |
| } |
| } |