/*

 * Copyright (c) 2014, 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.

 *

 * 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 TestArrayAllocatorMallocLimit

 * @summary Sanity check that the ArrayAllocatorMallocLimit flag can be set.

 * The test helps verifying that size_t flags can be set/read.

 * @bug 8054823

 * @key gc

 * @library /testlibrary

 * @modules java.base/sun.misc

 *          java.management

 * @run driver TestArrayAllocatorMallocLimit

 */

import java.math.BigInteger;

public class TestArrayAllocatorMallocLimit {

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

    testDefaultValue();

    testSetValue();

  }

  private static final String flagName = "ArrayAllocatorMallocLimit";

  //     size_t ArrayAllocatorMallocLimit                 = 18446744073709551615{experimental}

  private static final String printFlagsFinalPattern = " *size_t *" + flagName + " *:?= *(\\d+) *\\{experimental\\} *";

  public static void testDefaultValue()  throws Exception {

    ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(

      "-XX:+UnlockExperimentalVMOptions", "-XX:+PrintFlagsFinal", "-version");

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

    String value = output.firstMatch(printFlagsFinalPattern, 1);

    try {

      Asserts.assertNotNull(value, "Couldn't find size_t flag " + flagName);

      // A size_t is not always parseable with Long.parseValue,

      // use BigInteger instead.

      BigInteger biValue = new BigInteger(value);

      // Sanity check that we got a non-zero value.

      Asserts.assertNotEquals(biValue, "0");

      output.shouldHaveExitValue(0);

    } catch (Exception e) {

      System.err.println(output.getOutput());

      throw e;

    }

  }

  public static void testSetValue() throws Exception {

    long flagValue = 2048;

    ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(

      "-XX:+UnlockExperimentalVMOptions", "-XX:" + flagName + "=" + flagValue, "-XX:+PrintFlagsFinal", "-version");

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

    String value = output.firstMatch(printFlagsFinalPattern, 1);

    try {

      Asserts.assertNotNull("Couldn't find size_t flag " + flagName);

      long longValue = Long.parseLong(value);

      Asserts.assertEquals(longValue, flagValue);

      output.shouldHaveExitValue(0);

    } catch (Exception e) {

      System.err.println(output.getOutput());

      throw e;

    }

  }

}