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BTrace: A safe, dynamic tracing tool for the Java platform

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/*
 * Copyright (c) 2008, 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.  Oracle designates this
 * particular file as subject to the Classpath exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * 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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import org.openjdk.btrace.core.annotations.BTrace;

import static org.openjdk.btrace.core.BTraceUtils.Sys;
import static org.openjdk.btrace.core.BTraceUtils.println;

/*
 * A simple sample that dumps heap of the target at start and exits.
 * This BTrace program mimics the jmap tool (with -dump option).
 */
@BTrace
public class JMap {
    static {
        String name;
        if (Sys.$length() == 3) {
            name = Sys.$(2);
        } else {
            name = "heap.bin";
        }
        Sys.Memory.dumpHeap(name);
        println("heap dumped!");
        Sys.exit(0);
    }
}