/*

 * Copyright (c) 2014, 2016, 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.

 *

 * 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

 * @key gc

 * @bug 8049831

 * @library /test/lib

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

 *          java.management

 * @build sun.hotspot.WhiteBox

 *                              sun.hotspot.WhiteBox$WhiteBoxPermission

 * @run driver TestG1ClassUnloadingHWM

 * @summary Test that -XX:-ClassUnloadingWithConcurrentMark will trigger a Full GC when more than MetaspaceSize metadata is allocated.

 */

import jdk.test.lib.process.OutputAnalyzer;

import jdk.test.lib.process.ProcessTools;

import java.util.ArrayList;

import java.util.Arrays;

import sun.hotspot.WhiteBox;

public class TestG1ClassUnloadingHWM {

  private static long MetaspaceSize = 32 * 1024 * 1024;

  private static long YoungGenSize  = 32 * 1024 * 1024;

  private static OutputAnalyzer run(boolean enableUnloading) throws Exception {

    ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(

      "-Xbootclasspath/a:.",

      "-XX:+UnlockDiagnosticVMOptions",

      "-XX:+WhiteBoxAPI",

      "-XX:MetaspaceSize=" + MetaspaceSize,

      "-Xmn" + YoungGenSize,

      "-XX:+UseG1GC",

      "-XX:" + (enableUnloading ? "+" : "-") + "ClassUnloadingWithConcurrentMark",

      "-Xlog:gc",

      TestG1ClassUnloadingHWM.AllocateBeyondMetaspaceSize.class.getName(),

      "" + MetaspaceSize,

      "" + YoungGenSize);

    return new OutputAnalyzer(pb.start());

  }

  public static OutputAnalyzer runWithG1ClassUnloading() throws Exception {

    return run(true);

  }

  public static OutputAnalyzer runWithoutG1ClassUnloading() throws Exception {

    return run(false);

  }

  public static void testWithoutG1ClassUnloading() throws Exception {

    // -XX:-ClassUnloadingWithConcurrentMark is used, so we expect a full GC instead of a concurrent cycle.

    OutputAnalyzer out = runWithoutG1ClassUnloading();

    out.shouldMatch(".*Pause Full.*");

    out.shouldNotMatch(".*Pause Initial Mark.*");

  }

  public static void testWithG1ClassUnloading() throws Exception {

    // -XX:+ClassUnloadingWithConcurrentMark is used, so we expect a concurrent cycle instead of a full GC.

    OutputAnalyzer out = runWithG1ClassUnloading();

    out.shouldMatch(".*Pause Initial Mark.*");

    out.shouldNotMatch(".*Pause Full.*");

  }

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

    testWithG1ClassUnloading();

    testWithoutG1ClassUnloading();

  }

  public static class AllocateBeyondMetaspaceSize {

    public static Object dummy;

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

      if (args.length != 2) {

        throw new IllegalArgumentException("Usage: <MetaspaceSize> <YoungGenSize>");

      }

      WhiteBox wb = WhiteBox.getWhiteBox();

      // Allocate past the MetaspaceSize limit

      long metaspaceSize = Long.parseLong(args[0]);

      long allocationBeyondMetaspaceSize  = metaspaceSize * 2;

      long metaspace = wb.allocateMetaspace(null, allocationBeyondMetaspaceSize);

      long youngGenSize = Long.parseLong(args[1]);

      triggerYoungGCs(youngGenSize);

      wb.freeMetaspace(null, metaspace, metaspace);

    }

    public static void triggerYoungGCs(long youngGenSize) {

      long approxAllocSize = 32 * 1024;

      long numAllocations  = 2 * youngGenSize / approxAllocSize;

      for (long i = 0; i < numAllocations; i++) {

        dummy = new byte[(int)approxAllocSize];

      }

    }

  }

}