1 /* 2 * Copyright (c) 2016, 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 /** 26 * @test 27 * @bug 8148175 28 * @library /testlibrary /test/lib 29 * @run main ClassFileInstaller sun.hotspot.WhiteBox 30 * @run main/othervm/timeout=300 -XX:+UnlockDiagnosticVMOptions 31 * -XX:+WhiteBoxAPI -Xbatch -Xbootclasspath/a:. 32 * -Xmx300m PreserveFPRegistersTest 33 */ 34 35 import sun.hotspot.WhiteBox; 36 37 public class PreserveFPRegistersTest { 38 39 public static void main(String... args) throws InterruptedException { 40 new PreserveFPRegistersTest().go(); 41 } 42 43 private static WhiteBox wb = WhiteBox.getWhiteBox(); 44 45 public final Object[][] storage; 46 47 /** 48 * Number of objects per region. 49 */ 50 public final int K = 10; 51 52 /** 53 * Length of object array: sizeOf(Object[N]) ~= regionSize / K . 54 */ 55 public final int N; 56 57 /** 58 * How many regions involved into testing. 59 */ 60 public final int regionCount; 61 62 PreserveFPRegistersTest() { 63 long regionSize = wb.g1RegionSize(); 64 Runtime rt = Runtime.getRuntime(); 65 long used = rt.totalMemory() - rt.freeMemory(); 66 long totalFree = rt.maxMemory() - used; 67 regionCount = (int) ( (totalFree / regionSize) * 0.9); 68 int refSize = wb.getHeapOopSize(); 69 N = (int) ((regionSize / K ) / refSize) - 5; 70 71 System.out.println("%% Memory"); 72 System.out.println("%% used : " + used / 1024 + "M"); 73 System.out.println("%% available : " + totalFree / 1024 + "M"); 74 System.out.println("%% G1 Region Size: " + regionSize / 1024 + "M"); 75 System.out.println("%% region count : " + regionCount); 76 77 System.out.println("%% Objects storage"); 78 System.out.println("%% N (array length) : " + N); 79 System.out.println("%% K (objects in regions): " + K); 80 System.out.println("%% Reference size : " + refSize); 81 82 try { 83 storage = new Object[regionCount * K][]; 84 for (int i = 0; i < storage.length; i++) { 85 storage[i] = new Object[N]; 86 } 87 } catch(OutOfMemoryError e) { 88 throw new AssertionError("Test Failed with unexpected OutOfMemoryError exception"); 89 } 90 } 91 92 public void go() throws InterruptedException { 93 final float FINAL = getValue(); 94 95 for (int to = 0; to < regionCount; to++) { 96 Object celebrity = storage[to * K]; 97 for (int from = 0; from < regionCount; from++) { 98 for (int rn = 0; rn != 100; rn++) { 99 storage[getY(to, from, rn)][getX(to, from, rn)] = celebrity; 100 } 101 if (FINAL != getValue()) { 102 throw new AssertionError("Final value has changed: " + FINAL + " != " + getValue()); 103 } 104 } 105 } 106 107 System.out.println("TEST PASSED"); 108 } 109 110 public float getValue() { 111 return 6; 112 } 113 114 private int getX(int to, int from, int rn) { 115 return (rn*regionCount + to) % N; 116 } 117 118 private int getY(int to, int from, int rn) { 119 return ((rn*regionCount + to) / N + from * K) % (regionCount*K) ; 120 } 121 }