001/*
002 * Copyright (c) 2013, 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 jdk.internal.jvmci.meta;
024
025/**
026 * Represents a platform-specific low-level type for values.
027 */
028public interface PlatformKind {
029
030    String name();
031
032    JavaConstant getDefaultValue();
033
034    public interface Key {
035
036    }
037
038    public class EnumKey implements Key {
039        @SuppressWarnings("rawtypes") private final Enum e;
040
041        @SuppressWarnings("rawtypes")
042        public EnumKey(Enum e) {
043            this.e = e;
044        }
045
046        @Override
047        public int hashCode() {
048            return e.ordinal() ^ e.name().hashCode();
049        }
050
051        @Override
052        public boolean equals(Object obj) {
053            if (obj == this) {
054                return true;
055            }
056            if (obj instanceof EnumKey) {
057                EnumKey that = (EnumKey) obj;
058                return this.e == that.e;
059            }
060            return false;
061        }
062    }
063
064    /**
065     * Gets a value associated with this object that can be used as a stable key in a map. The
066     * {@link Object#hashCode()} implementation of the returned value should be stable between VM
067     * executions.
068     */
069    Key getKey();
070
071    default int getVectorLength() {
072        return 1;
073    }
074}