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.common.*;
026import jdk.internal.jvmci.meta.*;
027
028import com.oracle.graal.graph.*;
029import com.oracle.graal.graph.spi.*;
030import com.oracle.graal.nodeinfo.*;
031import com.oracle.graal.nodes.*;
032import com.oracle.graal.nodes.extended.*;
033import com.oracle.graal.nodes.memory.address.*;
034import com.oracle.graal.nodes.memory.address.AddressNode.Address;
035import com.oracle.graal.nodes.spi.*;
036
037/**
038 * Writes a given {@linkplain #value() value} a {@linkplain FixedAccessNode memory location}.
039 */
040@NodeInfo(nameTemplate = "Write#{p#location/s}")
041public final class WriteNode extends AbstractWriteNode implements LIRLowerable, Simplifiable, Virtualizable {
042
043    public static final NodeClass<WriteNode> TYPE = NodeClass.create(WriteNode.class);
044
045    private WriteNode(ValueNode address, LocationIdentity location, ValueNode value, BarrierType barrierType) {
046        this((AddressNode) address, location, value, barrierType);
047    }
048
049    public WriteNode(AddressNode address, LocationIdentity location, ValueNode value, BarrierType barrierType) {
050        super(TYPE, address, location, value, barrierType);
051    }
052
053    public WriteNode(AddressNode address, LocationIdentity location, ValueNode value, BarrierType barrierType, boolean initialization) {
054        super(TYPE, address, location, value, barrierType, initialization);
055    }
056
057    public WriteNode(AddressNode address, LocationIdentity location, ValueNode value, BarrierType barrierType, GuardingNode guard, boolean initialization) {
058        super(TYPE, address, location, value, barrierType, guard, initialization);
059    }
060
061    @Override
062    public void generate(NodeLIRBuilderTool gen) {
063        LIRKind writeKind = gen.getLIRGeneratorTool().getLIRKind(value().stamp());
064        gen.getLIRGeneratorTool().emitStore(writeKind, gen.operand(address), gen.operand(value()), gen.state(this));
065    }
066
067    @Override
068    public void simplify(SimplifierTool tool) {
069        if (getAddress() instanceof OffsetAddressNode) {
070            OffsetAddressNode objAddress = (OffsetAddressNode) getAddress();
071            if (objAddress.getBase() instanceof PiNode && ((PiNode) objAddress.getBase()).getGuard() == getGuard()) {
072                OffsetAddressNode newAddress = graph().unique(new OffsetAddressNode(((PiNode) objAddress.getBase()).getOriginalNode(), objAddress.getOffset()));
073                setAddress(newAddress);
074                tool.addToWorkList(newAddress);
075            }
076        }
077    }
078
079    @NodeIntrinsic
080    public static native void writeMemory(Address address, @ConstantNodeParameter LocationIdentity location, Object value, @ConstantNodeParameter BarrierType barrierType);
081
082    @Override
083    public void virtualize(VirtualizerTool tool) {
084        throw JVMCIError.shouldNotReachHere("unexpected WriteNode before PEA");
085    }
086
087    public boolean canNullCheck() {
088        return true;
089    }
090}