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 /test/lib 30 * @run main/bootclasspath/othervm -Xbatch -XX:+UnlockDiagnosticVMOptions 31 * -XX:+WhiteBoxAPI -Xmx300m -XX:+UseG1GC 32 * compiler.gcbarriers.PreserveFPRegistersTest 33 */ 34 35 package compiler.gcbarriers; 36 37 import sun.hotspot.WhiteBox; 38 39 public class PreserveFPRegistersTest { 40 41 public static void main(String... args) throws InterruptedException { 42 new PreserveFPRegistersTest().go(); 43 } 44 45 private static WhiteBox wb = WhiteBox.getWhiteBox(); 46 47 public final Object[][] storage; 48 49 /** 50 * Number of objects per region. 51 */ 52 public final int K = 10; 53 54 /** 55 * Length of object array: sizeOf(Object[N]) ~= regionSize / K . 56 */ 57 public final int N; 58 59 /** 60 * How many regions involved into testing. 61 */ 62 public final int regionCount; 63 64 PreserveFPRegistersTest() { 65 long regionSize = wb.g1RegionSize(); 66 Runtime rt = Runtime.getRuntime(); 67 long used = rt.totalMemory() - rt.freeMemory(); 68 long totalFree = rt.maxMemory() - used; 69 regionCount = (int) ( (totalFree / regionSize) * 0.9); 70 int refSize = wb.getHeapOopSize(); 71 N = (int) ((regionSize / K ) / refSize) - 5; 72 73 System.out.println("%% Memory"); 74 System.out.println("%% used : " + used / 1024 + "M"); 75 System.out.println("%% available : " + totalFree / 1024 + "M"); 76 System.out.println("%% G1 Region Size: " + regionSize / 1024 + "M"); 77 System.out.println("%% region count : " + regionCount); 78 79 System.out.println("%% Objects storage"); 80 System.out.println("%% N (array length) : " + N); 81 System.out.println("%% K (objects in regions): " + K); 82 System.out.println("%% Reference size : " + refSize); 83 84 try { 85 storage = new Object[regionCount * K][]; 86 for (int i = 0; i < storage.length; i++) { 87 storage[i] = new Object[N]; 88 } 89 } catch(OutOfMemoryError e) { 90 throw new AssertionError("Test Failed with unexpected OutOfMemoryError exception"); 91 } 92 } 93 94 public void go() throws InterruptedException { 95 final float FINAL = getValue(); 96 97 for (int to = 0; to < regionCount; to++) { 98 Object celebrity = storage[to * K]; 99 for (int from = 0; from < regionCount; from++) { 100 for (int rn = 0; rn != 100; rn++) { 101 storage[getY(to, from, rn)][getX(to, from, rn)] = celebrity; 102 } 103 if (FINAL != getValue()) { 104 throw new AssertionError("Final value has changed: " + FINAL + " != " + getValue()); 105 } 106 } 107 } 108 109 System.out.println("TEST PASSED"); 110 } 111 112 public float getValue() { 113 return 6; 114 } 115 116 private int getX(int to, int from, int rn) { 117 return (rn*regionCount + to) % N; 118 } 119 120 private int getY(int to, int from, int rn) { 121 return ((rn*regionCount + to) / N + from * K) % (regionCount*K) ; 122 } 123 }