1 /* 2 * Copyright (c) 2014, 2015, 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 * @modules java.base/jdk.internal.misc 33 * java.management 34 * @build RandomAllocationTest 35 * @run main ClassFileInstaller sun.hotspot.WhiteBox 36 * sun.hotspot.WhiteBox$WhiteBoxPermission 37 * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions 38 * -XX:CompileCommand=dontinline,Helper$TestCase::method 39 * -XX:+WhiteBoxAPI -XX:-SegmentedCodeCache RandomAllocationTest 40 * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions 41 * -XX:CompileCommand=dontinline,Helper$TestCase::method 42 * -XX:+WhiteBoxAPI -XX:+SegmentedCodeCache RandomAllocationTest 43 * @summary stressing code cache by allocating randomly sized "dummy" code blobs 44 */ 45 public class RandomAllocationTest implements Runnable { 46 private static final long CODE_CACHE_SIZE 47 = Helper.WHITE_BOX.getUintxVMFlag("ReservedCodeCacheSize"); 48 private static final int MAX_BLOB_SIZE = (int) (CODE_CACHE_SIZE >> 7); 49 private static final BlobType[] BLOB_TYPES 50 = BlobType.getAvailable().toArray(new BlobType[0]); 51 52 public static void main(String[] args) { 53 new CodeCacheStressRunner(new RandomAllocationTest()).runTest(); 54 } 55 56 private final ArrayList<Long> blobs = new ArrayList<>(); 57 @Override 58 public void run() { 59 boolean allocate = blobs.isEmpty() || Helper.RNG.nextBoolean(); 60 if (allocate) { 61 int type = Helper.RNG.nextInt(BLOB_TYPES.length); 62 long addr = Helper.WHITE_BOX.allocateCodeBlob( 63 Helper.RNG.nextInt(MAX_BLOB_SIZE), BLOB_TYPES[type].id); 64 if (addr != 0) { 65 blobs.add(addr); 66 } 67 } else { 68 int index = Helper.RNG.nextInt(blobs.size()); 69 Helper.WHITE_BOX.freeCodeBlob(blobs.remove(index)); 70 } 71 } 72 73 }