001/*
002 * Copyright (c) 2009, 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.java;
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.spi.*;
032import com.oracle.graal.nodes.virtual.*;
033
034/**
035 * The {@code StoreFieldNode} represents a write to a static or instance field.
036 */
037@NodeInfo(nameTemplate = "StoreField#{p#field/s}")
038public final class StoreFieldNode extends AccessFieldNode implements StateSplit, Virtualizable {
039    public static final NodeClass<StoreFieldNode> TYPE = NodeClass.create(StoreFieldNode.class);
040
041    @Input ValueNode value;
042    @OptionalInput(InputType.State) FrameState stateAfter;
043
044    public FrameState stateAfter() {
045        return stateAfter;
046    }
047
048    public void setStateAfter(FrameState x) {
049        assert x == null || x.isAlive() : "frame state must be in a graph";
050        updateUsages(stateAfter, x);
051        stateAfter = x;
052    }
053
054    public boolean hasSideEffect() {
055        return true;
056    }
057
058    public ValueNode value() {
059        return value;
060    }
061
062    public StoreFieldNode(ValueNode object, ResolvedJavaField field, ValueNode value) {
063        super(TYPE, StampFactory.forVoid(), object, field);
064        this.value = value;
065    }
066
067    public StoreFieldNode(ValueNode object, ResolvedJavaField field, ValueNode value, FrameState stateAfter) {
068        super(TYPE, StampFactory.forVoid(), object, field);
069        this.value = value;
070        this.stateAfter = stateAfter;
071    }
072
073    @Override
074    public void virtualize(VirtualizerTool tool) {
075        ValueNode alias = tool.getAlias(object());
076        if (alias instanceof VirtualObjectNode) {
077            VirtualInstanceNode virtual = (VirtualInstanceNode) alias;
078            int fieldIndex = virtual.fieldIndex(field());
079            if (fieldIndex != -1) {
080                tool.setVirtualEntry(virtual, fieldIndex, value(), false);
081                tool.delete();
082            }
083        }
084    }
085
086    public FrameState getState() {
087        return stateAfter;
088    }
089}