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 * @requires vm.gc=="G1" | vm.gc=="null" 29 * @library /testlibrary /test/lib 30 * @run main/bootclasspath/othervm -Xbatch -XX:+UnlockDiagnosticVMOptions 31 * -XX:+WhiteBoxAPI -Xmx300m -XX:+UseG1GC PreserveFPRegistersTest 32 */ 33 34 import sun.hotspot.WhiteBox; 35 36 public class PreserveFPRegistersTest { 37 38 public static void main(String... args) throws InterruptedException { 39 new PreserveFPRegistersTest().go(); 40 } 41 42 private static WhiteBox wb = WhiteBox.getWhiteBox(); 43 44 public final Object[][] storage; 45 46 /** 47 * Number of objects per region. 48 */ 49 public final int K = 10; 50 51 /** 52 * Length of object array: sizeOf(Object[N]) ~= regionSize / K . 53 */ 54 public final int N; 55 56 /** 57 * How many regions involved into testing. 58 */ 59 public final int regionCount; 60 61 PreserveFPRegistersTest() { 62 long regionSize = wb.g1RegionSize(); 63 Runtime rt = Runtime.getRuntime(); 64 long used = rt.totalMemory() - rt.freeMemory(); 65 long totalFree = rt.maxMemory() - used; 66 regionCount = (int) ( (totalFree / regionSize) * 0.9); 67 int refSize = wb.getHeapOopSize(); 68 N = (int) ((regionSize / K ) / refSize) - 5; 69 70 System.out.println("%% Memory"); 71 System.out.println("%% used : " + used / 1024 + "M"); 72 System.out.println("%% available : " + totalFree / 1024 + "M"); 73 System.out.println("%% G1 Region Size: " + regionSize / 1024 + "M"); 74 System.out.println("%% region count : " + regionCount); 75 76 System.out.println("%% Objects storage"); 77 System.out.println("%% N (array length) : " + N); 78 System.out.println("%% K (objects in regions): " + K); 79 System.out.println("%% Reference size : " + refSize); 80 81 try { 82 storage = new Object[regionCount * K][]; 83 for (int i = 0; i < storage.length; i++) { 84 storage[i] = new Object[N]; 85 } 86 } catch(OutOfMemoryError e) { 87 throw new AssertionError("Test Failed with unexpected OutOfMemoryError exception"); 88 } 89 } 90 91 public void go() throws InterruptedException { 92 final float FINAL = getValue(); 93 94 for (int to = 0; to < regionCount; to++) { 95 Object celebrity = storage[to * K]; 96 for (int from = 0; from < regionCount; from++) { 97 for (int rn = 0; rn != 100; rn++) { 98 storage[getY(to, from, rn)][getX(to, from, rn)] = celebrity; 99 } 100 if (FINAL != getValue()) { 101 throw new AssertionError("Final value has changed: " + FINAL + " != " + getValue()); 102 } 103 } 104 } 105 106 System.out.println("TEST PASSED"); 107 } 108 109 public float getValue() { 110 return 6; 111 } 112 113 private int getX(int to, int from, int rn) { 114 return (rn*regionCount + to) % N; 115 } 116 117 private int getY(int to, int from, int rn) { 118 return ((rn*regionCount + to) / N + from * K) % (regionCount*K) ; 119 } 120 }