001/*
002 * Copyright (c) 2011, 2015, Oracle and/or its affiliates. All rights reserved.
003 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
004 *
005 * This code is free software; you can redistribute it and/or modify it
006 * under the terms of the GNU General Public License version 2 only, as
007 * published by the Free Software Foundation.
008 *
009 * This code is distributed in the hope that it will be useful, but WITHOUT
010 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
011 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
012 * version 2 for more details (a copy is included in the LICENSE file that
013 * accompanied this code).
014 *
015 * You should have received a copy of the GNU General Public License version
016 * 2 along with this work; if not, write to the Free Software Foundation,
017 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
018 *
019 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
020 * or visit www.oracle.com if you need additional information or have any
021 * questions.
022 */
023package com.oracle.graal.nodes.memory;
024
025import jdk.internal.jvmci.meta.*;
026
027import com.oracle.graal.compiler.common.type.*;
028import com.oracle.graal.graph.*;
029import com.oracle.graal.nodeinfo.*;
030import com.oracle.graal.nodes.*;
031import com.oracle.graal.nodes.extended.*;
032import com.oracle.graal.nodes.memory.address.*;
033
034/**
035 * Accesses a value at an memory address specified by an {@linkplain #address address}. The access
036 * does not include a null check on the object.
037 */
038@NodeInfo
039public abstract class FixedAccessNode extends DeoptimizingFixedWithNextNode implements Access {
040    public static final NodeClass<FixedAccessNode> TYPE = NodeClass.create(FixedAccessNode.class);
041
042    @OptionalInput(InputType.Guard) protected GuardingNode guard;
043
044    @Input(InputType.Association) AddressNode address;
045    protected final LocationIdentity location;
046
047    protected boolean nullCheck;
048    protected BarrierType barrierType;
049
050    public AddressNode getAddress() {
051        return address;
052    }
053
054    public void setAddress(AddressNode address) {
055        updateUsages(this.address, address);
056        this.address = address;
057    }
058
059    public LocationIdentity getLocationIdentity() {
060        return location;
061    }
062
063    public boolean getNullCheck() {
064        return nullCheck;
065    }
066
067    public void setNullCheck(boolean check) {
068        this.nullCheck = check;
069    }
070
071    protected FixedAccessNode(NodeClass<? extends FixedAccessNode> c, AddressNode address, LocationIdentity location, Stamp stamp) {
072        this(c, address, location, stamp, BarrierType.NONE);
073    }
074
075    protected FixedAccessNode(NodeClass<? extends FixedAccessNode> c, AddressNode address, LocationIdentity location, Stamp stamp, BarrierType barrierType) {
076        this(c, address, location, stamp, null, barrierType, false, null);
077    }
078
079    protected FixedAccessNode(NodeClass<? extends FixedAccessNode> c, AddressNode address, LocationIdentity location, Stamp stamp, GuardingNode guard, BarrierType barrierType, boolean nullCheck,
080                    FrameState stateBefore) {
081        super(c, stamp, stateBefore);
082        this.address = address;
083        this.location = location;
084        this.guard = guard;
085        this.barrierType = barrierType;
086        this.nullCheck = nullCheck;
087    }
088
089    @Override
090    public boolean canDeoptimize() {
091        return nullCheck;
092    }
093
094    @Override
095    public GuardingNode getGuard() {
096        return guard;
097    }
098
099    @Override
100    public void setGuard(GuardingNode guard) {
101        updateUsagesInterface(this.guard, guard);
102        this.guard = guard;
103    }
104
105    @Override
106    public BarrierType getBarrierType() {
107        return barrierType;
108    }
109}