001/*
002 * Copyright (c) 2013, 2013, 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;
024
025import jdk.internal.jvmci.meta.*;
026
027import com.oracle.graal.compiler.common.type.*;
028import com.oracle.graal.graph.*;
029import com.oracle.graal.nodeinfo.*;
030
031/**
032 * This node represents an unconditional explicit request for immediate deoptimization.
033 *
034 * After this node, execution will continue using a fallback execution engine (such as an
035 * interpreter) at the position described by the {@link #stateBefore() deoptimization state}.
036 */
037@NodeInfo
038public abstract class AbstractDeoptimizeNode extends ControlSinkNode implements IterableNodeType, DeoptimizingNode.DeoptBefore {
039
040    public static final NodeClass<AbstractDeoptimizeNode> TYPE = NodeClass.create(AbstractDeoptimizeNode.class);
041    @OptionalInput(InputType.State) FrameState stateBefore;
042
043    protected AbstractDeoptimizeNode(NodeClass<? extends AbstractDeoptimizeNode> c, FrameState stateBefore) {
044        super(c, StampFactory.forVoid());
045        this.stateBefore = stateBefore;
046    }
047
048    @Override
049    public boolean canDeoptimize() {
050        return true;
051    }
052
053    @Override
054    public FrameState stateBefore() {
055        return stateBefore;
056    }
057
058    @Override
059    public void setStateBefore(FrameState f) {
060        updateUsages(stateBefore, f);
061        stateBefore = f;
062    }
063
064    public abstract ValueNode getActionAndReason(MetaAccessProvider metaAccess);
065
066    public abstract ValueNode getSpeculation(MetaAccessProvider metaAccess);
067}