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 * 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.

 *

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

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 */

/*

 * @test TestYoungObjectsOnDram

 * @summary Check that objects in young generation reside in dram.

 * @requires vm.gc=="null"

 * @library /test/lib

 * @build sun.hotspot.WhiteBox

 * @run driver ClassFileInstaller sun.hotspot.WhiteBox

 * @run main TestYoungObjectsOnDram -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions

 *                                  -XX:+WhiteBoxAPI

 */

import jdk.test.lib.process.OutputAnalyzer;

import jdk.test.lib.process.ProcessTools;

import jdk.test.lib.Asserts;

import sun.hotspot.WhiteBox;

import java.util.ArrayList;

import java.util.List;

import java.util.Collections;

/**

 * Test spawns YoungObjectTest in a separate VM and expects that it

 * completes without a RuntimeException.

 */

public class TestYoungObjectsOnDram {

    public static final int ALLOCATION_SIZE = 100;

    private static ArrayList<String> testOpts;

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

        testOpts = new ArrayList();

        String[] common_options = new String[] {

            "-Xbootclasspath/a:.",

            "-XX:+UnlockExperimentalVMOptions",

            "-XX:+UnlockDiagnosticVMOptions",

            "-XX:+WhiteBoxAPI",

            "-XX:AllocateOldGenAt="+System.getProperty("test.dir", "."),

            "-XX:SurvivorRatio=1", // Survivor-to-eden ratio is 1:1

            "-Xms10M", "-Xmx10M",

            "-XX:InitialTenuringThreshold=15" // avoid promotion of objects to Old Gen

        };

        String testVmOptsStr = System.getProperty("test.java.opts");

        if (!testVmOptsStr.isEmpty()) {

            String[] testVmOpts = testVmOptsStr.split(" ");

            Collections.addAll(testOpts, testVmOpts);

        }

        Collections.addAll(testOpts, common_options);

        // Test with G1 GC

        runTest("-XX:+UseG1GC");

    }

    private static void runTest(String... extraFlags) throws Exception {

        Collections.addAll(testOpts, extraFlags);

        testOpts.add(YoungObjectTest.class.getName());

        System.out.println(testOpts);

        ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(false,

                testOpts.toArray(new String[testOpts.size()]));

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

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

        output.shouldHaveExitValue(0);

    }

}

/**

 * This class tests that newly created object is in Young generation and resides in DRAM.

 * The necessary condition for this test is running in VM with the following flags:

 * -XX:AllocateOldGenAt=, -XX:InitialTenuringThreshold=15, -XX:SurvivorRatio=1

 */

class YoungObjectTest {

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

    private static void validateYoungObject(Object o) {

        Asserts.assertTrue(!WB.isObjectInOldGen(o),

                "Object is supposed to be in YoungGen");

        long youngObj_addr = WB.getObjectAddress(o);

        long dram_heap_start = WB.dramReservedStart();

        long dram_heap_end = WB.dramReservedEnd();

        Asserts.assertTrue(youngObj_addr >= dram_heap_start && youngObj_addr <= dram_heap_end,

                "Young object does not reside in DRAM");

    }

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

        // allocate an object

        byte[] youngObj = new byte[TestYoungObjectsOnDram.ALLOCATION_SIZE];

        validateYoungObject(youngObj);

        // Start a Young GC and check that object is still in DRAM.

        // We have used -XX:InitialTenuringThreshold=15 to invoke this test

        WB.youngGC();

        validateYoungObject(youngObj);

    }

}