org.openjdk.jol.MainObjectEstimates Maven / Gradle / Ivy

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/*
 * Copyright (c) 2012, 2013, 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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package org.openjdk.jol;

import org.openjdk.jol.datamodel.X86_32_DataModel;
import org.openjdk.jol.datamodel.X86_64_COOPS_DataModel;
import org.openjdk.jol.datamodel.X86_64_DataModel;
import org.openjdk.jol.info.ClassLayout;
import org.openjdk.jol.layouters.HotSpotLayouter;

import static java.lang.System.out;

/**
 * @author Aleksey Shipilev
 */
public class MainObjectEstimates {

    public static void main(String[] args) throws Exception {
        if (args.length == 0) {
            System.err.println("Usage: jol-estimates.jar [class-name]*");
            System.exit(1);
        }

        for (String klassName : args) {
            try {
                Class klass = Class.forName(klassName);

                out.println("***** 32-bit VM: **********************************************************");
                out.println(ClassLayout.parseClass(klass, new HotSpotLayouter(new X86_32_DataModel(), false, false, false)));

                out.println("***** 64-bit VM: **********************************************************");
                out.println(ClassLayout.parseClass(klass, new HotSpotLayouter(new X86_64_DataModel(), false, false, false)));

                out.println("***** 64-bit VM, compressed references enabled: ***************************");
                out.println(ClassLayout.parseClass(klass, new HotSpotLayouter(new X86_64_COOPS_DataModel(), false, false, false)));
            } catch (Throwable t) {
                t.printStackTrace(System.err);
            }
        }
    }

}