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annotate jvmci/jdk.vm.ci.hotspot/src/jdk/vm/ci/hotspot/MetaspaceWrapperObject.java @ 24138:b01354ea98ec

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bring jvmci-8 more into sync with jvmci-9
author Doug Simon <doug.simon@oracle.com>
date Mon, 12 Jun 2017 15:23:09 +0200
parents eb166b568645
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /*
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2 * Copyright (c) 2015, 2015, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 */
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23 package jdk.vm.ci.hotspot;
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24
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25 /**
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26 * A tag interface indicating that this type is a wrapper around a HotSpot metaspace object that
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27 * requires GC interaction to keep alive.
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28 *
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29 * It would preferable if this were the base class containing the pointer but that would require
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30 * mixins since most of the wrapper types have complex supertype hierarchies.
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31 */
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32 interface MetaspaceWrapperObject {
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33
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34 long getMetaspacePointer();
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35
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36 /**
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37 * Check if this object is properly registered for metadata tracking. All classes which
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38 * implement this interface must be registered with the
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39 * {@link HotSpotJVMCIMetaAccessContext#add} unless they are kept alive through other means.
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40 * Currently the only type which doesn't require explicit registration is
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41 * {@link HotSpotResolvedObjectTypeImpl} since it's kept alive by references to the
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42 * {@link Class}.
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43 *
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44 * @return true if this object is properly registered for meta data tracking.
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45 */
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46 default boolean isRegistered() {
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47 return HotSpotJVMCIRuntime.runtime().metaAccessContext.isRegistered(this);
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48 }
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49 }