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/*
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* Copyright (c) 2013, 2019, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package org.graalvm.compiler.nodes;
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import org.graalvm.compiler.nodes.spi.NodeWithState;
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/**
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* Interface implemented by nodes which may need {@linkplain FrameState deoptimization information}.
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* <p>
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* Sub-interfaces are used to specify exactly when the deoptimization can take place:
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* {@linkplain DeoptBefore before}, {@linkplain DeoptAfter after}, and/or {@linkplain DeoptDuring
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* during}. <br>
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* Note that these sub-interfaces are not mutually exclusive so that nodes that may deoptimize at
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* multiple times can be modeled.
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*/
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public interface DeoptimizingNode extends NodeWithState {
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/**
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* Determines if this node needs deoptimization information.
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*/
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boolean canDeoptimize();
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/**
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* Interface for nodes that need a {@link FrameState} for deoptimizing to a point before their
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* execution.
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*/
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public interface DeoptBefore extends DeoptimizingNode {
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/**
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* Sets the {@link FrameState} describing the program state before the execution of this
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* node.
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*/
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void setStateBefore(FrameState state);
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FrameState stateBefore();
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}
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/**
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* Interface for nodes that need a {@link FrameState} for deoptimizing to a point after their
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* execution.
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*/
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public interface DeoptAfter extends DeoptimizingNode, StateSplit {
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}
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/**
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* Interface for nodes that need a special {@link FrameState} for deoptimizing during their
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* execution (e.g. {@link Invoke}).
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*/
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public interface DeoptDuring extends DeoptimizingNode, StateSplit {
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FrameState stateDuring();
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/**
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* Sets the {@link FrameState} describing the program state during the execution of this
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* node.
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*/
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void setStateDuring(FrameState state);
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/**
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* Compute the {@link FrameState} describing the program state during the execution of this
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* node from an input {@link FrameState} describing the program state after finishing the
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* execution of this node.
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*/
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void computeStateDuring(FrameState stateAfter);
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}
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}
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