--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/hotspot/test/runtime/contended/DefaultValue.java Fri May 17 01:58:32 2013 +0400
@@ -0,0 +1,185 @@
+/*
+ * Copyright (c) 2013, 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.
+ */
+
+import java.io.BufferedReader;
+import java.io.InputStreamReader;
+import java.lang.Class;
+import java.lang.String;
+import java.lang.System;
+import java.lang.management.ManagementFactory;
+import java.lang.management.RuntimeMXBean;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.concurrent.CyclicBarrier;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+import java.lang.reflect.Field;
+import java.lang.reflect.Modifier;
+import sun.misc.Unsafe;
+import sun.misc.Contended;
+
+/*
+ * @test
+ * @bug 8014509
+ * @summary \@Contended: explicit default value behaves differently from the implicit value
+ *
+ * @run main/othervm -XX:-RestrictContended DefaultValue
+ */
+public class DefaultValue {
+
+ private static final Unsafe U;
+ private static int ADDRESS_SIZE;
+ private static int HEADER_SIZE;
+
+ static {
+ // steal Unsafe
+ try {
+ Field unsafe = Unsafe.class.getDeclaredField("theUnsafe");
+ unsafe.setAccessible(true);
+ U = (Unsafe) unsafe.get(null);
+ } catch (NoSuchFieldException | IllegalAccessException e) {
+ throw new IllegalStateException(e);
+ }
+
+ // When running with CompressedOops on 64-bit platform, the address size
+ // reported by Unsafe is still 8, while the real reference fields are 4 bytes long.
+ // Try to guess the reference field size with this naive trick.
+ try {
+ long off1 = U.objectFieldOffset(CompressedOopsClass.class.getField("obj1"));
+ long off2 = U.objectFieldOffset(CompressedOopsClass.class.getField("obj2"));
+ ADDRESS_SIZE = (int) Math.abs(off2 - off1);
+ HEADER_SIZE = (int) Math.min(off1, off2);
+ } catch (NoSuchFieldException e) {
+ ADDRESS_SIZE = -1;
+ }
+ }
+
+ static class CompressedOopsClass {
+ public Object obj1;
+ public Object obj2;
+ }
+
+ public static boolean arePaddedPairwise(Class klass, String field1, String field2) throws Exception {
+ Field f1 = klass.getField(field1);
+ Field f2 = klass.getField(field2);
+
+ int diff = offset(f1) - offset(f2);
+ if (diff < 0) {
+ // f1 is first
+ return (offset(f2) - (offset(f1) + getSize(f1))) > 64;
+ } else {
+ // f2 is first
+ return (offset(f1) - (offset(f2) + getSize(f2))) > 64;
+ }
+ }
+
+ public static boolean sameLayout(Class klass1, Class klass2) throws Exception {
+ for (Field f1 : klass1.getDeclaredFields()) {
+ Field f2 = klass2.getDeclaredField(f1.getName());
+ if (offset(f1) != offset(f2)) {
+ return false;
+ }
+ }
+
+ for (Field f2 : klass1.getDeclaredFields()) {
+ Field f1 = klass2.getDeclaredField(f2.getName());
+ if (offset(f1) != offset(f2)) {
+ return false;
+ }
+ }
+
+ return true;
+ }
+
+ public static boolean isStatic(Field field) {
+ return Modifier.isStatic(field.getModifiers());
+ }
+
+ public static int offset(Field field) {
+ if (isStatic(field)) {
+ return (int) U.staticFieldOffset(field);
+ } else {
+ return (int) U.objectFieldOffset(field);
+ }
+ }
+
+ public static int getSize(Field field) {
+ Class type = field.getType();
+ if (type == byte.class) { return 1; }
+ if (type == boolean.class) { return 1; }
+ if (type == short.class) { return 2; }
+ if (type == char.class) { return 2; }
+ if (type == int.class) { return 4; }
+ if (type == float.class) { return 4; }
+ if (type == long.class) { return 8; }
+ if (type == double.class) { return 8; }
+ return ADDRESS_SIZE;
+ }
+
+ public static void main(String[] args) throws Exception {
+ boolean endResult = true;
+
+ if (!arePaddedPairwise(R1.class, "int1", "int2")) {
+ System.err.println("R1 failed");
+ endResult &= false;
+ }
+
+ if (!arePaddedPairwise(R2.class, "int1", "int2")) {
+ System.err.println("R2 failed");
+ endResult &= false;
+ }
+
+ if (!arePaddedPairwise(R3.class, "int1", "int2")) {
+ System.err.println("R3 failed");
+ endResult &= false;
+ }
+
+ System.out.println(endResult ? "Test PASSES" : "Test FAILS");
+ if (!endResult) {
+ throw new Error("Test failed");
+ }
+ }
+
+ public static class R1 {
+ @Contended
+ public int int1;
+ @Contended
+ public int int2;
+ }
+
+ public static class R2 {
+ @Contended("")
+ public int int1;
+ @Contended("")
+ public int int2;
+ }
+
+ public static class R3 {
+ @Contended()
+ public int int1;
+ @Contended()
+ public int int2;
+ }
+
+}
+