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/bootclasspath/othervm -Xint UnsafeOnHeapBooleanTest 29 * @run main/bootclasspath/othervm -Xcomp -XX:+TieredCompilation -XX:TieredStopAtLevel=3 UnsafeOnHeapBooleanTest 30 * @run main/bootclasspath/othervm -Xcomp -XX:-TieredCompilation UnsafeOnHeapBooleanTest 31 */ 32 33 import jdk.internal.misc.Unsafe; 34 35 import java.lang.reflect.Field; 36 37 public class UnsafeOnHeapBooleanTest { 38 39 static short static_v; 40 41 public static void main(String args[]) { 42 43 System.out.println("### Test started"); 44 45 Unsafe UNSAFE = Unsafe.getUnsafe(); 46 47 try { 48 49 // Write two bytes into the static field 50 // UnsafeOnHeapBooleanTest.static_v write two values. Both 51 // bytes correspond to the boolean value 'true'. 52 Field staticVField = UnsafeOnHeapBooleanTest.class.getDeclaredField("static_v"); 53 Object base = UNSAFE.staticFieldBase(staticVField); 54 long offset = UNSAFE.staticFieldOffset(staticVField); 55 UNSAFE.putShort(base, offset, (short)0x0204); 56 57 // Read two bytes from the static field 58 // UnsafeOnHeapBooleanTest.static_v (as booleans). 59 boolean bool0 = UNSAFE.getBoolean(base, offset + 0); 60 boolean bool1 = UNSAFE.getBoolean(base, offset + 1); 61 boolean result = bool0 & bool1; 62 63 // Check if the two 'true' boolean values were normalized 64 // (i.e., reduced from the range 1...255 to 1). 65 if (!bool0 || !bool1 || !result) { 66 System.out.println("Some of the results below are wrong"); 67 System.out.println("bool0 is: " + bool0); 68 System.out.println("bool1 is: " + bool1); 69 System.out.println("bool0 & bool1 is: " + result); 70 System.out.println("==================================="); 71 throw new RuntimeException("### Test failed"); 72 } else { 73 System.out.println("Test generated correct results"); 74 System.out.println("bool0 is: " + bool0); 75 System.out.println("bool1 is: " + bool1); 76 System.out.println("bool0 & bool1 is: " + result); 77 System.out.println("==================================="); 78 } 79 } catch (NoSuchFieldException e) { 80 throw new RuntimeException("### Test failure: static field UnsafeOnHeapBooleanTest.static_v was not found"); 81 } 82 83 System.out.println("### Test passed"); 84 85 } 86 }