JDK14/Java14源码在线阅读

/*
 * Copyright (c) 2019, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
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package org.graalvm.compiler.nodes.debug;

import org.graalvm.compiler.core.common.type.StampFactory;
import org.graalvm.compiler.graph.NodeClass;
import org.graalvm.compiler.nodeinfo.InputType;
import org.graalvm.compiler.nodeinfo.NodeCycles;
import org.graalvm.compiler.nodeinfo.NodeInfo;
import org.graalvm.compiler.nodeinfo.NodeSize;
import org.graalvm.compiler.nodes.NodeView;
import org.graalvm.compiler.nodes.ValueNode;
import org.graalvm.compiler.nodes.memory.AbstractMemoryCheckpoint;
import org.graalvm.compiler.nodes.memory.MemoryCheckpoint;
import org.graalvm.compiler.nodes.spi.LIRLowerable;
import org.graalvm.compiler.nodes.spi.NodeLIRBuilderTool;
import jdk.internal.vm.compiler.word.LocationIdentity;

/**
 * Debug node that can be used when an arbitrary side-effect and when a
 * {@link LocationIdentity#ANY_LOCATION} kill is needed.
 */
@NodeInfo(cycles = NodeCycles.CYCLES_IGNORED, size = NodeSize.SIZE_IGNORED, allowedUsageTypes = {InputType.Memory})
public class SideEffectNode extends AbstractMemoryCheckpoint implements LIRLowerable, MemoryCheckpoint.Single {
    public static final NodeClass<SideEffectNode> TYPE = NodeClass.create(SideEffectNode.class);

    @OptionalInput ValueNode value;

    public SideEffectNode() {
        super(TYPE, StampFactory.forVoid());
    }

    public SideEffectNode(ValueNode value) {
        super(TYPE, value.stamp(NodeView.DEFAULT));
        this.value = value;
    }

    @Override
    public boolean hasSideEffect() {

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