/*

 *

 * 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.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 *

 */

/**

 * @test TestHeapDump

 * @summary Tests JVMTI heap dumps

 * @key gc

 * @requires vm.gc.Shenandoah & !vm.graal.enabled

 * @compile TestHeapDump.java

 * @run main/othervm/native/timeout=300 -agentlib:TestHeapDump -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -Xmx128m -XX:ShenandoahGCHeuristics=aggressive                        TestHeapDump

 *

 */

/**

 * @test TestHeapDump

 * @summary Tests JVMTI heap dumps

 * @key gc

 * @requires vm.gc.Shenandoah & !vm.graal.enabled & (vm.bits == "64")

 * @compile TestHeapDump.java

 * @run main/othervm/native/timeout=300 -agentlib:TestHeapDump -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -Xmx128m -XX:ShenandoahGCHeuristics=aggressive -XX:-UseCompressedOops TestHeapDump

 */

public class TestHeapDump {

    private static final int NUM_ITER = 10000;

    private static final int ARRAY_SIZE = 1000;

    private static final int EXPECTED_OBJECTS =

            ARRAY_SIZE +   // array reachable from instance field

                    1 +            // static field root

                    1;             // local field root

    static {

        try {

            System.loadLibrary("TestHeapDump");

        } catch (UnsatisfiedLinkError ule) {

            System.err.println("Could not load TestHeapDump library");

            System.err.println("java.library.path: "

                    + System.getProperty("java.library.path"));

            throw ule;

        }

    }

    native static int heapdump(Class<?> filterClass);

    public static void main(String args[]) {

        new TestHeapDump().run();

    }

    // This root needs to be discovered

    static Object root = new TestObject();

    // This field needs to be discovered

    TestObject[] array;

    public void run() {

        array = new TestObject[ARRAY_SIZE];

        for (int i = 0; i < ARRAY_SIZE; i++) {

            array[i] = new TestObject();

        }

        TestObject localRoot = new TestObject();

        for (int i = 0; i < NUM_ITER; i++) {

            int numObjs = heapdump(TestObject.class);

            if (numObjs != EXPECTED_OBJECTS) {

                throw new RuntimeException("Expected " + EXPECTED_OBJECTS + " objects, but got " + numObjs);

            }

        }

    }

    // We look for the instances of this class during the heap scan

    public static class TestObject {}

}