/* * 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 org.graalvm.compiler.hotspot.nodes; import static org.graalvm.compiler.nodeinfo.NodeCycles.CYCLES_50; import static org.graalvm.compiler.nodeinfo.NodeSize.SIZE_50; import org.graalvm.compiler.graph.NodeClass; import org.graalvm.compiler.nodeinfo.NodeInfo; import org.graalvm.compiler.nodes.ValueNode; import org.graalvm.compiler.nodes.memory.address.AddressNode; /** * 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(cycles = CYCLES_50, size = SIZE_50) public final class G1ReferentFieldReadBarrier extends ObjectWriteBarrier { public static final NodeClass 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; } }