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 * @test 26 * @bug 8161720 27 * @modules java.base/jdk.internal.misc 28 * @run main/othervm -Xint UnsafeOffHeapBooleanTest 1 29 * @run main/othervm -XX:+TieredCompilation -XX:TieredStopAtLevel=3 -Xbatch UnsafeOffHeapBooleanTest 20000 30 * @run main/othervm -XX:-TieredCompilation -Xbatch UnsafeOffHeapBooleanTest 20000 31 */ 32 33 34 import java.lang.reflect.Field; 35 import jdk.internal.misc.Unsafe; 36 37 public class UnsafeOffHeapBooleanTest { 38 static boolean bool0 = false, bool1 = false, result = false; 39 static Unsafe UNSAFE = Unsafe.getUnsafe(); 40 static long offHeapMemory; 41 42 public static void test() { 43 // Write two bytes to the off-heap memory location, both 44 // bytes correspond to the boolean value 'true'. 45 UNSAFE.putShort(null, offHeapMemory, (short)0x0204); 46 47 // Read two bytes from the storage allocated above (as booleans). 48 bool0 = UNSAFE.getBoolean(null, offHeapMemory + 0); 49 bool1 = UNSAFE.getBoolean(null, offHeapMemory + 1); 50 result = bool0 & bool1; 51 } 52 53 public static void main(String args[]) { 54 System.out.println("### Test started"); 55 56 if (args.length != 1) { 57 throw new RuntimeException("### Test failure: test called with incorrect number of arguments"); 58 } 59 60 // Allocate two bytes of storage. 61 offHeapMemory = UNSAFE.allocateMemory(2); 62 63 try { 64 for (int i = 0; i < Integer.parseInt(args[0]); i++) { 65 test(); 66 } 67 68 // Check if the two 'true' boolean values were normalized 69 // (i.e., reduced from the range 1...255 to 1). 70 if (!bool0 || !bool1 || !result) { 71 System.out.println("Some of the results below are wrong"); 72 System.out.println("bool0 is: " + bool0); 73 System.out.println("bool1 is: " + bool1); 74 System.out.println("bool0 & bool1 is: " + result); 75 System.out.println("==================================="); 76 throw new RuntimeException("### Test failed"); 77 } else { 78 System.out.println("Test generated correct results"); 79 System.out.println("bool0 is: " + bool0); 80 System.out.println("bool1 is: " + bool1); 81 System.out.println("bool0 & bool1 is: " + result); 82 System.out.println("==================================="); 83 } 84 } catch (NumberFormatException e) { 85 throw new RuntimeException("### Test failure: test called with incorrectly formatted parameter"); 86 } 87 88 UNSAFE.freeMemory(offHeapMemory); 89 90 System.out.println("### Test passed"); 91 } 92 }