Mercurial > hg > graal-jvmci-8
view graal/com.oracle.graal.hotspot/src/com/oracle/graal/hotspot/nodes/G1ReferentFieldReadBarrier.java @ 21995:922a0438914b
Introduce common superclass for all write barriers.
author | Roland Schatz <roland.schatz@oracle.com> |
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date | Wed, 17 Jun 2015 15:42:27 +0200 |
parents | a858c5f56d8a |
children |
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/* * Copyright (c) 2013, 2015, 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 com.oracle.graal.hotspot.nodes; import com.oracle.graal.graph.*; import com.oracle.graal.nodeinfo.*; import com.oracle.graal.nodes.*; import com.oracle.graal.nodes.memory.address.*; /** * The {@code G1ReferentFieldReadBarrier} is added when a read access is performed to the referent * field of a {@link java.lang.ref.Reference} object (through a {@code LoadFieldNode} or an * {@code UnsafeLoadNode}). The return value of the read is passed to the snippet implementing the * read barrier and consequently is added to the SATB queue if the concurrent marker is enabled. */ @NodeInfo public final class G1ReferentFieldReadBarrier extends ObjectWriteBarrier { public static final NodeClass<G1ReferentFieldReadBarrier> TYPE = NodeClass.create(G1ReferentFieldReadBarrier.class); protected final boolean doLoad; public G1ReferentFieldReadBarrier(AddressNode address, ValueNode expectedObject, boolean doLoad) { super(TYPE, address, expectedObject, true); this.doLoad = doLoad; } public ValueNode getExpectedObject() { return getValue(); } public boolean doLoad() { return doLoad; } }