1 /*

     2  * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.

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

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.

     8  *

     9  * This code is distributed in the hope that it will be useful, but WITHOUT

    10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    12  * version 2 for more details (a copy is included in the LICENSE file that

    13  * accompanied this code).

    14  *

    15  * You should have received a copy of the GNU General Public License version

    16  * 2 along with this work; if not, write to the Free Software Foundation,

    17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    18  *

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

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

    21  * questions.

    22  *

    23  */

    24 

    25 import java.util.ArrayList;

    26 

    27 import sun.hotspot.code.BlobType;

    28 

    29 /*

    30  * @test RandomAllocationTest

    31  * @library /testlibrary /../../test/lib

    32  * @build RandomAllocationTest

    33  * @run main ClassFileInstaller sun.hotspot.WhiteBox

    34  *                              sun.hotspot.WhiteBox$WhiteBoxPermission

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

    36  *                   -XX:CompileCommand=dontinline,Helper$TestCase::method

    37  *                   -XX:+WhiteBoxAPI -XX:-SegmentedCodeCache RandomAllocationTest

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

    39  *                   -XX:CompileCommand=dontinline,Helper$TestCase::method

    40  *                   -XX:+WhiteBoxAPI -XX:+SegmentedCodeCache RandomAllocationTest

    41  * @summary stressing code cache by allocating randomly sized "dummy" code blobs

    42  */

    43 public class RandomAllocationTest implements Runnable {

    44     private static final long CODE_CACHE_SIZE

    45             = Helper.WHITE_BOX.getUintxVMFlag("ReservedCodeCacheSize");

    46     private static final int MAX_BLOB_SIZE = (int) (CODE_CACHE_SIZE >> 7);

    47     private static final BlobType[] BLOB_TYPES

    48             = BlobType.getAvailable().toArray(new BlobType[0]);

    49 

    50     public static void main(String[] args) {

    51         new CodeCacheStressRunner(new RandomAllocationTest()).runTest();

    52     }

    53 

    54     private final ArrayList<Long> blobs = new ArrayList<>();

    55     @Override

    56     public void run() {

    57         boolean allocate = blobs.isEmpty() || Helper.RNG.nextBoolean();

    58         if (allocate) {

    59             int type = Helper.RNG.nextInt(BLOB_TYPES.length);

    60             long addr = Helper.WHITE_BOX.allocateCodeBlob(

    61                     Helper.RNG.nextInt(MAX_BLOB_SIZE), BLOB_TYPES[type].id);

    62             if (addr != 0) {

    63                 blobs.add(addr);

    64             }

    65         } else {

    66             int index = Helper.RNG.nextInt(blobs.size());

    67             Helper.WHITE_BOX.freeCodeBlob(blobs.remove(index));

    68         }

    69     }

    70 

    71 }