| /* |
| * Copyright (c) 2013, 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 org.graalvm.compiler.nodes.memory; |
| |
| import org.graalvm.compiler.core.common.LocationIdentity; |
| import org.graalvm.compiler.core.common.type.Stamp; |
| import org.graalvm.compiler.graph.NodeClass; |
| import org.graalvm.compiler.nodeinfo.NodeInfo; |
| import org.graalvm.compiler.nodes.FrameState; |
| import org.graalvm.compiler.nodes.extended.GuardingNode; |
| import org.graalvm.compiler.nodes.memory.address.AddressNode; |
| |
| /** |
| * An {@link FixedAccessNode} that can be converted to a {@link FloatingAccessNode}. |
| */ |
| @NodeInfo |
| public abstract class FloatableAccessNode extends FixedAccessNode { |
| public static final NodeClass<FloatableAccessNode> TYPE = NodeClass.create(FloatableAccessNode.class); |
| |
| protected FloatableAccessNode(NodeClass<? extends FloatableAccessNode> c, AddressNode address, LocationIdentity location, Stamp stamp) { |
| super(c, address, location, stamp); |
| } |
| |
| protected FloatableAccessNode(NodeClass<? extends FloatableAccessNode> c, AddressNode address, LocationIdentity location, Stamp stamp, GuardingNode guard, BarrierType barrierType) { |
| super(c, address, location, stamp, guard, barrierType, false, null); |
| } |
| |
| protected FloatableAccessNode(NodeClass<? extends FloatableAccessNode> c, AddressNode address, LocationIdentity location, Stamp stamp, GuardingNode guard, BarrierType barrierType, |
| boolean nullCheck, FrameState stateBefore) { |
| super(c, address, location, stamp, guard, barrierType, nullCheck, stateBefore); |
| } |
| |
| public abstract FloatingAccessNode asFloatingNode(MemoryNode lastLocationAccess); |
| |
| protected boolean forceFixed; |
| |
| public void setForceFixed(boolean flag) { |
| this.forceFixed = flag; |
| } |
| |
| /** |
| * AccessNodes can float only if their location identities are not ANY_LOCATION. Furthermore, in |
| * case G1 is enabled any access (read) to the java.lang.ref.Reference.referent field which has |
| * an attached write barrier with pre-semantics can not also float. |
| */ |
| public boolean canFloat() { |
| return !forceFixed && getLocationIdentity().isSingle() && getBarrierType() == BarrierType.NONE; |
| } |
| } |