hotspot/src/jdk.vm.compiler/share/classes/org.graalvm.compiler.hotspot/src/org/graalvm/compiler/hotspot/nodes/SnippetAnchorNode.java

/*
 * Copyright (c) 2013, 2015, 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.hotspot.nodes;

import static org.graalvm.compiler.nodeinfo.InputType.Anchor;
import static org.graalvm.compiler.nodeinfo.InputType.Guard;
import static org.graalvm.compiler.nodeinfo.InputType.Value;
import static org.graalvm.compiler.nodeinfo.NodeCycles.CYCLES_0;
import static org.graalvm.compiler.nodeinfo.NodeSize.SIZE_0;

import org.graalvm.compiler.core.common.type.StampFactory;
import org.graalvm.compiler.graph.NodeClass;
import org.graalvm.compiler.graph.spi.Simplifiable;
import org.graalvm.compiler.graph.spi.SimplifierTool;
import org.graalvm.compiler.nodeinfo.NodeInfo;
import org.graalvm.compiler.nodes.AbstractBeginNode;
import org.graalvm.compiler.nodes.FixedWithNextNode;
import org.graalvm.compiler.nodes.extended.GuardingNode;

@NodeInfo(allowedUsageTypes = {Value, Anchor, Guard}, cycles = CYCLES_0, size = SIZE_0)
public final class SnippetAnchorNode extends FixedWithNextNode implements Simplifiable, GuardingNode {
    public static final NodeClass<SnippetAnchorNode> TYPE = NodeClass.create(SnippetAnchorNode.class);

    public SnippetAnchorNode() {
        super(TYPE, StampFactory.object());
    }

    @Override
    public void simplify(SimplifierTool tool) {
        AbstractBeginNode prevBegin = AbstractBeginNode.prevBegin(this);
        replaceAtUsages(Anchor, prevBegin);
        replaceAtUsages(Guard, prevBegin);
        if (tool.allUsagesAvailable() && hasNoUsages()) {
            graph().removeFixed(this);
        }
    }

    @NodeIntrinsic
    public static native GuardingNode anchor();
}