| /* |
| * Copyright (c) 2009, 2016, 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 jdk.vm.ci.meta; |
| |
| /** |
| * Abstract base class for values. |
| */ |
| public abstract class Value { |
| |
| public static final Value[] NO_VALUES = new Value[0]; |
| |
| public static final AllocatableValue ILLEGAL = new IllegalValue(); |
| |
| private static final class IllegalValue extends AllocatableValue { |
| private IllegalValue() { |
| super(ValueKind.Illegal); |
| } |
| |
| @Override |
| public String toString() { |
| return "-"; |
| } |
| |
| @Override |
| public boolean equals(Object other) { |
| // Due to de-serialization this object may exist multiple times. So we compare classes |
| // instead of the individual objects. (This anonymous class has always the same meaning) |
| return other instanceof IllegalValue; |
| } |
| } |
| |
| private final ValueKind<?> valueKind; |
| |
| /** |
| * Initializes a new value of the specified kind. |
| * |
| * @param valueKind the kind |
| */ |
| protected Value(ValueKind<?> valueKind) { |
| this.valueKind = valueKind; |
| } |
| |
| /** |
| * Returns a String representation of the kind, which should be the end of all |
| * {@link #toString()} implementation of subclasses. |
| */ |
| protected final String getKindSuffix() { |
| return "|" + valueKind.getKindSuffix(); |
| } |
| |
| public final ValueKind<?> getValueKind() { |
| return valueKind; |
| } |
| |
| public final <K extends ValueKind<K>> K getValueKind(Class<K> cls) { |
| return cls.cast(valueKind); |
| } |
| |
| /** |
| * Returns the platform specific kind used to store this value. |
| */ |
| public final PlatformKind getPlatformKind() { |
| return valueKind.getPlatformKind(); |
| } |
| |
| @Override |
| public int hashCode() { |
| return 41 + valueKind.hashCode(); |
| } |
| |
| @Override |
| public boolean equals(Object obj) { |
| if (obj instanceof Value) { |
| Value that = (Value) obj; |
| return valueKind.equals(that.valueKind); |
| } |
| return false; |
| } |
| |
| /** |
| * Checks if this value is identical to {@code other}. |
| * |
| * Warning: Use with caution! Usually equivalence {@link #equals(Object)} is sufficient and |
| * should be used. |
| */ |
| public final boolean identityEquals(Value other) { |
| return this == other; |
| } |
| } |