001/*
002 * Copyright (c) 2011, 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 com.oracle.graal.nodes.spi.*;
026
027/**
028 * A state split is a node that may have a frame state associated with it.
029 */
030public interface StateSplit extends NodeWithState {
031
032    FixedNode asNode();
033
034    /**
035     * Gets the {@link FrameState} corresponding to the state of the JVM after execution of this
036     * node.
037     */
038    FrameState stateAfter();
039
040    /**
041     * Sets the {@link FrameState} corresponding to the state of the JVM after execution of this
042     * node.
043     */
044    void setStateAfter(FrameState x);
045
046    /**
047     * Determines if this node has a side-effect. Such nodes cannot be safely re-executed because
048     * they modify state which is visible to other threads or modify state beyond what is captured
049     * in {@link FrameState} nodes.
050     */
051    boolean hasSideEffect();
052}