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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

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 *

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 * 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

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 *

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 * 2 along with this work; if not, write to the Free Software Foundation,

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/*

 * @test TestPLABOutput

 * @bug 8140585

 * @summary Check that G1 does not report empty PLAB statistics in the first evacuation.

 * @requires vm.gc.G1

 * @key gc

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

 * @library /test/lib

 * @build sun.hotspot.WhiteBox

 * @run main ClassFileInstaller sun.hotspot.WhiteBox

 * @run driver TestPLABOutput

 */

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 TestPLABOutput {

    public static void runTest() throws Exception {

        final String[] arguments = {

            "-Xbootclasspath/a:.",

            "-XX:+UnlockExperimentalVMOptions",

            "-XX:+UnlockDiagnosticVMOptions",

            "-XX:+WhiteBoxAPI",

            "-XX:+UseG1GC",

            "-Xmx10M",

            "-Xlog:gc+plab=debug",

            GCTest.class.getName()

            };

        ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(arguments);

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

        output.shouldHaveExitValue(0);

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

        String pattern = ".*GC\\(0\\) .*allocated: (\\d+).*";

        Pattern r = Pattern.compile(pattern);

        Matcher m = r.matcher(output.getStdout());

        if (!m.find()) {

            throw new RuntimeException("Could not find any PLAB statistics output");

        }

        int allocated = Integer.parseInt(m.group(1));

        assertGT(allocated, 0, "Did not allocate any memory during test");

    }

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

        runTest();

    }

    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);

        }

    }

}