JDK14/Java14源码在线阅读

/*
 * Copyright (c) 2014, 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.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 */


package org.graalvm.compiler.nodes.java;

import static org.graalvm.compiler.nodeinfo.InputType.Association;
import static org.graalvm.compiler.nodeinfo.InputType.Memory;
import static org.graalvm.compiler.nodeinfo.NodeCycles.CYCLES_8;
import static org.graalvm.compiler.nodeinfo.NodeSize.SIZE_2;

import jdk.vm.ci.meta.JavaKind;
import org.graalvm.compiler.core.common.type.StampFactory;
import org.graalvm.compiler.graph.NodeClass;
import org.graalvm.compiler.nodeinfo.NodeInfo;
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.memory.address.AddressNode;
import org.graalvm.compiler.nodes.spi.LIRLowerable;
import org.graalvm.compiler.nodes.spi.NodeLIRBuilderTool;
import jdk.internal.vm.compiler.word.LocationIdentity;

import jdk.vm.ci.meta.Value;

/**
 * Represents an atomic read-and-add operation like
 * {@link sun.misc.Unsafe#getAndAddInt(Object, long, int)}.
 */
@NodeInfo(allowedUsageTypes = Memory, cycles = CYCLES_8, size = SIZE_2)
public final class AtomicReadAndAddNode extends AbstractMemoryCheckpoint implements LIRLowerable, MemoryCheckpoint.Single {

    public static final NodeClass<AtomicReadAndAddNode> TYPE = NodeClass.create(AtomicReadAndAddNode.class);
    @Input(Association) AddressNode address;
    @Input ValueNode delta;
    /**
     * We explicitly track the kind of this node instead of using {#delta.getStackKind()} to be able
     * to emit the memory access instruction with the correct number of bits.
     */
    private JavaKind valueKind;

    protected final LocationIdentity locationIdentity;

    public AtomicReadAndAddNode(AddressNode address, ValueNode delta, JavaKind valueKind, LocationIdentity locationIdentity) {
        super(TYPE, StampFactory.forKind(valueKind));
        this.address = address;
        this.delta = delta;
        this.valueKind = valueKind;
        this.locationIdentity = locationIdentity;
    }

    public ValueNode delta() {
        return delta;
    }

    @Override

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