Mercurial > hg > graal-jvmci-8
view jvmci/jdk.vm.ci.meta/src/jdk/vm/ci/meta/LocationIdentity.java @ 23365:30af491f98c5
Remove TrustedInterface (JDK-8155719).
author | Roland Schatz <roland.schatz@oracle.com> |
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date | Fri, 29 Apr 2016 10:54:19 +0200 |
parents | 1bbd4a7c274b |
children |
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/* * Copyright (c) 2011, 2012, 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; import java.util.IdentityHashMap; // JaCoCo Exclude /** * Marker interface for location identities. A different location identity of two memory accesses * guarantees that the two accesses do not interfere. * * Clients of {@link LocationIdentity} must use {@link #equals(Object)}, not {@code ==}, when * comparing two {@link LocationIdentity} values for equality. Likewise, they must not use * {@link IdentityHashMap}s with {@link LocationIdentity} values as keys. */ public abstract class LocationIdentity { private static final class AnyLocationIdentity extends LocationIdentity { @Override public boolean isImmutable() { return false; } @Override public String toString() { return "ANY_LOCATION"; } } public static final LocationIdentity ANY_LOCATION = new AnyLocationIdentity(); public static LocationIdentity any() { return ANY_LOCATION; } /** * Denotes a location is unchanging in all cases. Not that this is different than the Java * notion of final which only requires definite assignment. */ public abstract boolean isImmutable(); public final boolean isMutable() { return !isImmutable(); } public final boolean isAny() { return this == ANY_LOCATION; } public final boolean isSingle() { return this != ANY_LOCATION; } public final boolean overlaps(LocationIdentity other) { return isAny() || other.isAny() || this.equals(other); } }