/*
 * Copyright (c) 2011, 2014, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * 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).
 *
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 * 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.virtual;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

import org.graalvm.compiler.nodes.java.MonitorIdNode;

The class implements a simple linked list of MonitorIdNodes, which can be used to describe the current lock state of an object.
/** * The class implements a simple linked list of MonitorIdNodes, which can be used to describe the * current lock state of an object. */
public final class LockState { public final MonitorIdNode monitorId; public final LockState next; public LockState(MonitorIdNode monitorId, LockState next) { this.monitorId = monitorId; this.next = next; } @Override public String toString() { return monitorId.getLockDepth() + (next == null ? "" : "," + next); } public static List<MonitorIdNode> asList(LockState state) { if (state == null) { return Collections.emptyList(); } else { ArrayList<MonitorIdNode> result = new ArrayList<>(); LockState a = state; do { result.add(a.monitorId); a = a.next; } while (a != null); return result; } } }