| /* |
| * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| /** |
| * @test |
| * @bug 8148175 |
| * @requires vm.gc=="G1" | vm.gc=="null" |
| * @library /test/lib |
| * @run main/bootclasspath/othervm -Xbatch -XX:+UnlockDiagnosticVMOptions |
| * -XX:+WhiteBoxAPI -Xmx300m -XX:+UseG1GC |
| * compiler.gcbarriers.PreserveFPRegistersTest |
| */ |
| |
| package compiler.gcbarriers; |
| |
| import sun.hotspot.WhiteBox; |
| |
| public class PreserveFPRegistersTest { |
| |
| public static void main(String... args) throws InterruptedException { |
| new PreserveFPRegistersTest().go(); |
| } |
| |
| private static WhiteBox wb = WhiteBox.getWhiteBox(); |
| |
| public final Object[][] storage; |
| |
| /** |
| * Number of objects per region. |
| */ |
| public final int K = 10; |
| |
| /** |
| * Length of object array: sizeOf(Object[N]) ~= regionSize / K . |
| */ |
| public final int N; |
| |
| /** |
| * How many regions involved into testing. |
| */ |
| public final int regionCount; |
| |
| PreserveFPRegistersTest() { |
| long regionSize = wb.g1RegionSize(); |
| Runtime rt = Runtime.getRuntime(); |
| long used = rt.totalMemory() - rt.freeMemory(); |
| long totalFree = rt.maxMemory() - used; |
| regionCount = (int) ( (totalFree / regionSize) * 0.9); |
| int refSize = wb.getHeapOopSize(); |
| N = (int) ((regionSize / K ) / refSize) - 5; |
| |
| System.out.println("%% Memory"); |
| System.out.println("%% used : " + used / 1024 + "M"); |
| System.out.println("%% available : " + totalFree / 1024 + "M"); |
| System.out.println("%% G1 Region Size: " + regionSize / 1024 + "M"); |
| System.out.println("%% region count : " + regionCount); |
| |
| System.out.println("%% Objects storage"); |
| System.out.println("%% N (array length) : " + N); |
| System.out.println("%% K (objects in regions): " + K); |
| System.out.println("%% Reference size : " + refSize); |
| |
| try { |
| storage = new Object[regionCount * K][]; |
| for (int i = 0; i < storage.length; i++) { |
| storage[i] = new Object[N]; |
| } |
| } catch(OutOfMemoryError e) { |
| throw new AssertionError("Test Failed with unexpected OutOfMemoryError exception"); |
| } |
| } |
| |
| public void go() throws InterruptedException { |
| final float FINAL = getValue(); |
| |
| for (int to = 0; to < regionCount; to++) { |
| Object celebrity = storage[to * K]; |
| for (int from = 0; from < regionCount; from++) { |
| for (int rn = 0; rn != 100; rn++) { |
| storage[getY(to, from, rn)][getX(to, from, rn)] = celebrity; |
| } |
| if (FINAL != getValue()) { |
| throw new AssertionError("Final value has changed: " + FINAL + " != " + getValue()); |
| } |
| } |
| } |
| |
| System.out.println("TEST PASSED"); |
| } |
| |
| public float getValue() { |
| return 6; |
| } |
| |
| private int getX(int to, int from, int rn) { |
| return (rn*regionCount + to) % N; |
| } |
| |
| private int getY(int to, int from, int rn) { |
| return ((rn*regionCount + to) / N + from * K) % (regionCount*K) ; |
| } |
| } |