1 /*
   2  * Copyright (c) 2017, 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  * @test ReturnBlobToWrongHeapTest
  26  * @key stress
  27  * @summary Test if VM attempts to return code blobs to an incorrect code heap or to outside of the code cache.
  28  * @library /test/lib /
  29  * @modules java.base/jdk.internal.misc
  30  *          java.management
  31  *
  32  * @build sun.hotspot.WhiteBox
  33  * @run driver ClassFileInstaller sun.hotspot.WhiteBox
  34  *                                sun.hotspot.WhiteBox$WhiteBoxPermission
  35  * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions
  36  *                   -XX:+WhiteBoxAPI
  37  *                   -XX:CompileCommand=dontinline,compiler.codecache.stress.Helper$TestCase::method
  38  *                   -XX:+SegmentedCodeCache
  39  *                   -XX:ReservedCodeCacheSize=16M
  40  *                   -XX:CodeCacheMinBlockLength=1
  41  *                   compiler.codecache.stress.ReturnBlobToWrongHeapTest
  42  */
  43 
  44 package compiler.codecache.stress;
  45 
  46 import sun.hotspot.code.BlobType;
  47 
  48 import java.util.ArrayList;
  49 
  50 public class ReturnBlobToWrongHeapTest {
  51     private static final long largeBlobSize = Helper.WHITE_BOX.getUintxVMFlag("ReservedCodeCacheSize") >> 6;
  52     private static final long codeCacheMinBlockLength = Helper.WHITE_BOX.getUintxVMFlag("CodeCacheMinBlockLength");
  53     private static final BlobType[] BLOB_TYPES = BlobType.getAvailable().toArray(new BlobType[0]);
  54 
  55     // Allocate blob in first code heap (the code heap with index 0).
  56     private static long allocate(int size) {
  57         return Helper.WHITE_BOX.allocateCodeBlob(size, BLOB_TYPES[0].id);
  58     }
  59 
  60     // Free blob.
  61     private static void free(long address) {
  62         Helper.WHITE_BOX.freeCodeBlob(address);
  63     }
  64 
  65     public static void main(String[] args) {
  66         if (codeCacheMinBlockLength == 1) {
  67             // Fill first code heap with large blobs until allocation fails.
  68             long address;
  69             while ((address = allocate((int)largeBlobSize)) != 0) {
  70             }
  71 
  72             // Allocate segment-sized blocks in first code heap.
  73             long lastSegmentSizedAddress = 0; // Address of the last segment-sized blob allocated
  74             while ((address = allocate(0)) != 0) {
  75                 lastSegmentSizedAddress = address;
  76             }
  77 
  78             if (lastSegmentSizedAddress == 0) {
  79                 throw new RuntimeException("Test failed: Not possible to allocate segment-sized blob");
  80             }
  81 
  82             // Remove last segment-sized block from the first code heap.
  83             free(lastSegmentSizedAddress);
  84         } else {
  85             throw new RuntimeException("Test requires CodeCacheMinBlockLength==1; CodeCacheMinBlockLength is " +
  86                                        codeCacheMinBlockLength);
  87         }
  88     }
  89 }