/*

 * Copyright (c) 2016, 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).

 *

 * 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.

 *

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 */

/*

 * @test TestAgeOutput

 * @bug 8164936

 * @summary Check that collectors using age table based aging print an age table even for the first garbage collection

 * @key gc

 * @requires vm.gc=="null"

 * @modules java.base/jdk.internal.misc

 * @library /test/lib

 * @build sun.hotspot.WhiteBox

 * @run main ClassFileInstaller sun.hotspot.WhiteBox

 * @run main/othervm -XX:+UseSerialGC TestAgeOutput UseSerialGC

 * @run main/othervm -XX:+UseConcMarkSweepGC TestAgeOutput UseConcMarkSweepGC

 * @run main/othervm -XX:+UseG1GC TestAgeOutput UseG1GC

 */

import sun.hotspot.WhiteBox;

import java.util.regex.Matcher;

import java.util.regex.Pattern;

import jdk.test.lib.Platform;

import jdk.test.lib.process.OutputAnalyzer;

import jdk.test.lib.process.ProcessTools;

import static jdk.test.lib.Asserts.*;

public class TestAgeOutput {

    public static void checkPattern(String pattern, String what) throws Exception {

        Pattern r = Pattern.compile(pattern);

        Matcher m = r.matcher(what);

        if (!m.find()) {

            throw new RuntimeException("Could not find pattern " + pattern + " in output");

        }

    }

    public static void runTest(String gcArg) throws Exception {

        final String[] arguments = {

            "-Xbootclasspath/a:.",

            "-XX:+UnlockExperimentalVMOptions",

            "-XX:+UnlockDiagnosticVMOptions",

            "-XX:+WhiteBoxAPI",

            "-XX:+" + gcArg,

            "-Xmx10M",

            "-Xlog:gc+age=trace",

            GCTest.class.getName()

            };

        ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(arguments);

        OutputAnalyzer output = new OutputAnalyzer(pb.start());

        output.shouldHaveExitValue(0);

        System.out.println(output.getStdout());

        String stdout = output.getStdout();

        checkPattern(".*GC\\(0\\) .*Desired survivor size.*", stdout);

        checkPattern(".*GC\\(0\\) .*Age table with threshold.*", stdout);

        checkPattern(".*GC\\(0\\) .*- age   1:.*", stdout);

    }

    public static void main(String[] args) throws Exception {

        runTest(args[0]);

    }

    static class GCTest {

        private static final WhiteBox WB = WhiteBox.getWhiteBox();

        public static Object holder;

        public static void main(String [] args) {

            holder = new byte[100];

            WB.youngGC();

            System.out.println(holder);

        }

    }

}