001/*
002 * Copyright (c) 2014, 2014, Oracle and/or its affiliates. All rights reserved.
003 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
004 *
005 * This code is free software; you can redistribute it and/or modify it
006 * under the terms of the GNU General Public License version 2 only, as
007 * published by the Free Software Foundation.
008 *
009 * This code is distributed in the hope that it will be useful, but WITHOUT
010 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
011 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
012 * version 2 for more details (a copy is included in the LICENSE file that
013 * accompanied this code).
014 *
015 * You should have received a copy of the GNU General Public License version
016 * 2 along with this work; if not, write to the Free Software Foundation,
017 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
018 *
019 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
020 * or visit www.oracle.com if you need additional information or have any
021 * questions.
022 */
023package com.oracle.graal.nodes.calc;
024
025import jdk.internal.jvmci.meta.*;
026
027import com.oracle.graal.compiler.common.calc.*;
028import com.oracle.graal.graph.*;
029import com.oracle.graal.nodes.*;
030
031/**
032 * Represents a conversion between primitive types.
033 */
034public interface ConvertNode extends ArithmeticOperation, NodeInterface {
035
036    ValueNode getValue();
037
038    Constant convert(Constant c, ConstantReflectionProvider constantReflection);
039
040    Constant reverse(Constant c, ConstantReflectionProvider constantReflection);
041
042    /**
043     * Check whether a conversion is lossless.
044     *
045     * @return true iff reverse(convert(c)) == c for all c
046     */
047    boolean isLossless();
048
049    /**
050     * Check whether a conversion preserves comparison order.
051     *
052     * @param op a comparison operator
053     * @return true iff (c1 op c2) == (convert(c1) op convert(c2)) for all c1, c2
054     */
055    default boolean preservesOrder(Condition op) {
056        return isLossless();
057    }
058
059    /**
060     * Check whether a conversion preserves comparison order against a particular constant value.
061     *
062     * @param op a comparison operator
063     * @param value
064     * @param constantReflection
065     * @return true iff (c1 op value) == (convert(c1) op convert(value)) for value and all c1
066     */
067    default boolean preservesOrder(Condition op, Constant value, ConstantReflectionProvider constantReflection) {
068        return preservesOrder(op);
069    }
070
071    ValueNode asNode();
072}