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357 lines
13 KiB
Java
357 lines
13 KiB
Java
/*
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* Copyright (c) 2026, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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import java.lang.Class;
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import java.lang.reflect.Field;
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import java.lang.reflect.Modifier;
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import jdk.internal.misc.Unsafe;
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import jdk.internal.vm.annotation.Contended;
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/*
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* @test
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* @summary \@Contended with different sized primitive types
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* @modules java.base/jdk.internal.misc
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* @modules java.base/jdk.internal.vm.annotation
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* @run main/othervm -XX:-RestrictContended MixedPrimitives
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*/
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public class MixedPrimitives {
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private static final Unsafe U = Unsafe.getUnsafe();
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private static final int ADDRESS_SIZE;
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private static final int HEADER_SIZE;
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static {
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// When running with CompressedOops on 64-bit platform, the address size
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// reported by Unsafe is still 8, while the real reference fields are 4 bytes long.
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// Try to guess the reference field size with this naive trick.
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try {
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long off1 = U.objectFieldOffset(CompressedOopsClass.class.getField("obj1"));
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long off2 = U.objectFieldOffset(CompressedOopsClass.class.getField("obj2"));
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ADDRESS_SIZE = (int) Math.abs(off2 - off1);
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HEADER_SIZE = (int) Math.min(off1, off2);
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} catch (NoSuchFieldException e) {
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throw new ExceptionInInitializerError(e);
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}
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}
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static class CompressedOopsClass {
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public Object obj1;
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public Object obj2;
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}
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public static boolean arePaddedPairwise(Class klass, String field1, String field2) throws Exception {
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Field f1 = klass.getDeclaredField(field1);
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Field f2 = klass.getDeclaredField(field2);
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if (isStatic(f1) != isStatic(f2)) {
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return true; // these guys are in naturally disjoint locations
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}
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int diff = offset(f1) - offset(f2);
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if (diff < 0) {
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// f1 is first
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return (offset(f2) - (offset(f1) + getSize(f1))) > 64;
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} else {
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// f2 is first
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return (offset(f1) - (offset(f2) + getSize(f2))) > 64;
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}
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}
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public static boolean isPadded(Class klass, String field1) throws Exception {
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Field f1 = klass.getDeclaredField(field1);
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if (isStatic(f1)) {
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return offset(f1) > 128 + 64;
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}
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return offset(f1) > 64;
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}
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public static boolean sameLayout(Class klass1, Class klass2) throws Exception {
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try {
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for (Field f1 : klass1.getDeclaredFields()) {
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Field f2 = klass2.getDeclaredField(f1.getName());
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if (offset(f1) != offset(f2)) {
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return false;
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}
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}
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for (Field f2 : klass1.getDeclaredFields()) {
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Field f1 = klass2.getDeclaredField(f2.getName());
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if (offset(f1) != offset(f2)) {
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return false;
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}
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}
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} catch (Exception e) {
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System.err.println("Failed getting layout from class: " + e.getMessage());
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return false;
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}
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return true;
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}
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public static boolean isStatic(Field field) {
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return Modifier.isStatic(field.getModifiers());
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}
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public static int offset(Field field) {
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if (isStatic(field)) {
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return (int) U.staticFieldOffset(field);
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} else {
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return (int) U.objectFieldOffset(field);
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}
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}
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public static int getSize(Field field) {
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Class type = field.getType();
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if (type == byte.class) { return 1; }
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if (type == boolean.class) { return 1; }
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if (type == short.class) { return 2; }
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if (type == char.class) { return 2; }
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if (type == int.class) { return 4; }
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if (type == float.class) { return 4; }
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if (type == long.class) { return 8; }
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if (type == double.class) { return 8; }
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return ADDRESS_SIZE;
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}
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public static void main(String[] args) throws Exception {
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int failures = 0;
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failures += Test1.checkLayout();
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failures += Test2.checkLayout();
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failures += Test3.checkLayout();
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failures += Test4.checkLayout();
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failures += Test5.checkLayout();
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failures += Test6.checkLayout();
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failures += Test7.checkLayout();
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failures += Test8.checkLayout();
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failures += Test9.checkLayout();
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if (!sameLayout(Test4.class, Test7.class)) {
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System.err.println("Test4 and Test7 have different layouts");
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failures += 1;
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}
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if (!sameLayout(Test5.class, Test6.class)) {
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System.err.println("Test5 and Test6 have different layouts");
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failures += 1;
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}
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if (!sameLayout(Test8.class, Test9.class)) {
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System.err.println("Test8 and Test9 have different layouts");
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failures += 1;
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}
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System.out.println(failures == 0 ? "Test PASSES" : "Test FAILS");
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if (failures > 0) {
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throw new Error("Test failed. Incurred " + failures + " failures.");
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}
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}
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// naturally packed
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public static class Test1 {
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private long long1;
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private int int1;
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private short short1;
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public static int checkLayout() throws Exception {
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if (arePaddedPairwise(Test1.class, "long1", "int1") ||
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arePaddedPairwise(Test1.class, "long1", "short1") ||
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arePaddedPairwise(Test1.class, "int1", "short1") ||
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isPadded(Test1.class, "long1") ||
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isPadded(Test1.class, "int1") ||
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isPadded(Test1.class, "short1")) {
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System.err.println("Test1 failed");
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return 1;
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}
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return 0;
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}
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}
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// long1 is padded
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public static class Test2 {
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@Contended private long long1;
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private int int1;
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private short short1;
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public static int checkLayout() throws Exception {
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if (!arePaddedPairwise(Test2.class, "long1", "int1") ||
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!arePaddedPairwise(Test2.class, "long1", "short1") ||
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arePaddedPairwise(Test2.class, "int1", "short1") ||
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!isPadded(Test2.class, "long1") ||
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isPadded(Test2.class, "int1") ||
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isPadded(Test2.class, "short1")) {
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System.err.println("Test2 failed");
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return 1;
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}
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return 0;
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}
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}
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// both fields are padded
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public static class Test3 {
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@Contended private long long1;
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@Contended private int int1;
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@Contended private short short1;
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public static int checkLayout() throws Exception {
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if (!arePaddedPairwise(Test3.class, "long1", "int1") ||
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!arePaddedPairwise(Test3.class, "long1", "short1") ||
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!arePaddedPairwise(Test3.class, "int1", "short1") ||
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!isPadded(Test3.class, "long1") ||
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!isPadded(Test3.class, "int1") ||
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!isPadded(Test3.class, "short1")) {
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System.err.println("Test3 failed");
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return 1;
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}
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return 0;
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}
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}
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// fields are padded in the singular group
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public static class Test4 {
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@Contended("sameGroup") private long long1;
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@Contended("sameGroup") private int int1;
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@Contended("sameGroup") private short short1;
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public static int checkLayout() throws Exception {
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if (arePaddedPairwise(Test4.class, "long1", "int1") ||
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arePaddedPairwise(Test4.class, "long1", "short1") ||
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arePaddedPairwise(Test4.class, "int1", "short1") ||
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!isPadded(Test4.class, "long1") ||
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!isPadded(Test4.class, "int1") ||
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!isPadded(Test4.class, "short1")) {
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System.err.println("Test4 failed");
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return 1;
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}
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return 0;
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}
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}
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// fields are padded in disjoint groups
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public static class Test5 {
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@Contended("diffGroup1") private long long1;
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@Contended("diffGroup2") private int int1;
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@Contended("diffGroup3") private short short1;
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public static int checkLayout() throws Exception {
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if (!arePaddedPairwise(Test5.class, "long1", "int1") ||
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!arePaddedPairwise(Test5.class, "long1", "short1") ||
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!arePaddedPairwise(Test5.class, "int1", "short1") ||
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!isPadded(Test5.class, "long1") ||
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!isPadded(Test5.class, "int1") ||
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!isPadded(Test5.class, "short1")) {
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System.err.println("Test5 failed");
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return 1;
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}
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return 0;
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}
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}
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// fields are padded in disjoint groups
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public static class Test6 {
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@Contended private long long1;
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@Contended("diffGroup2") private int int1;
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@Contended("diffGroup3") private short short1;
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public static int checkLayout() throws Exception {
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if (!arePaddedPairwise(Test6.class, "long1", "int1") ||
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!arePaddedPairwise(Test6.class, "long1", "short1") ||
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!arePaddedPairwise(Test6.class, "int1", "short1") ||
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!isPadded(Test6.class, "long1") ||
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!isPadded(Test6.class, "int1") ||
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!isPadded(Test6.class, "short1")) {
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System.err.println("Test6 failed");
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return 1;
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}
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return 0;
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}
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}
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// fields are padded in the singular group
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@Contended
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public static class Test7 {
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private long long1;
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private int int1;
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private short short1;
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public static int checkLayout() throws Exception {
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if (arePaddedPairwise(Test7.class, "long1", "int1") ||
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arePaddedPairwise(Test7.class, "long1", "short1") ||
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arePaddedPairwise(Test7.class, "int1", "short1") ||
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!isPadded(Test7.class, "long1") ||
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!isPadded(Test7.class, "int1") ||
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!isPadded(Test7.class, "short1")) {
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System.err.println("Test7 failed");
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return 1;
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}
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return 0;
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}
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}
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// all fields are padded as the group, and one field is padded specifically
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@Contended
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public static class Test8 {
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@Contended private long long1;
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private int int1;
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private short short1;
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public static int checkLayout() throws Exception {
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if (!arePaddedPairwise(Test8.class, "long1", "int1") ||
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!arePaddedPairwise(Test8.class, "long1", "short1") ||
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arePaddedPairwise(Test8.class, "int1", "short1") ||
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!isPadded(Test8.class, "long1") ||
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!isPadded(Test8.class, "int1") ||
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!isPadded(Test8.class, "short1")) {
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System.err.println("Test8 failed");
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return 1;
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}
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return 0;
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}
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}
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// all fields are padded as the group, and one field is padded specifically
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@Contended
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public static class Test9 {
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@Contended("group") private long long1;
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private int int1;
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private short short1;
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public static int checkLayout() throws Exception {
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if (!arePaddedPairwise(Test9.class, "long1", "int1") ||
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!arePaddedPairwise(Test9.class, "long1", "short1") ||
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arePaddedPairwise(Test9.class, "int1", "short1") ||
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!isPadded(Test9.class, "long1") ||
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!isPadded(Test9.class, "int1") ||
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!isPadded(Test9.class, "short1")) {
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System.err.println("Test9 failed");
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return 1;
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}
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return 0;
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}
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}
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}
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