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/*
* Copyright (C) 2014 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
import java.lang.reflect.Field;
import sun.misc.Unsafe;
public class Main {
private static void check(int actual, int expected, String msg) {
if (actual != expected) {
System.out.println(msg + " : " + actual + " != " + expected);
System.exit(1);
}
}
private static void check(long actual, long expected, String msg) {
if (actual != expected) {
System.out.println(msg + " : " + actual + " != " + expected);
System.exit(1);
}
}
private static void check(Object actual, Object expected, String msg) {
if (actual != expected) {
System.out.println(msg + " : " + actual + " != " + expected);
System.exit(1);
}
}
private static Unsafe getUnsafe() throws NoSuchFieldException, IllegalAccessException {
Class<?> unsafeClass = Unsafe.class;
Field f = unsafeClass.getDeclaredField("theUnsafe");
f.setAccessible(true);
return (Unsafe) f.get(null);
}
public static void main(String[] args) throws NoSuchFieldException, IllegalAccessException {
System.loadLibrary(args[0]);
Unsafe unsafe = getUnsafe();
testArrayBaseOffset(unsafe);
testArrayIndexScale(unsafe);
testGetAndPutAndCAS(unsafe);
testGetAndPutVolatile(unsafe);
}
private static void testArrayBaseOffset(Unsafe unsafe) {
check(unsafe.arrayBaseOffset(boolean[].class), vmArrayBaseOffset(boolean[].class),
"Unsafe.arrayBaseOffset(boolean[])");
check(unsafe.arrayBaseOffset(byte[].class), vmArrayBaseOffset(byte[].class),
"Unsafe.arrayBaseOffset(byte[])");
check(unsafe.arrayBaseOffset(char[].class), vmArrayBaseOffset(char[].class),
"Unsafe.arrayBaseOffset(char[])");
check(unsafe.arrayBaseOffset(double[].class), vmArrayBaseOffset(double[].class),
"Unsafe.arrayBaseOffset(double[])");
check(unsafe.arrayBaseOffset(float[].class), vmArrayBaseOffset(float[].class),
"Unsafe.arrayBaseOffset(float[])");
check(unsafe.arrayBaseOffset(int[].class), vmArrayBaseOffset(int[].class),
"Unsafe.arrayBaseOffset(int[])");
check(unsafe.arrayBaseOffset(long[].class), vmArrayBaseOffset(long[].class),
"Unsafe.arrayBaseOffset(long[])");
check(unsafe.arrayBaseOffset(Object[].class), vmArrayBaseOffset(Object[].class),
"Unsafe.arrayBaseOffset(Object[])");
}
private static void testArrayIndexScale(Unsafe unsafe) {
check(unsafe.arrayIndexScale(boolean[].class), vmArrayIndexScale(boolean[].class),
"Unsafe.arrayIndexScale(boolean[])");
check(unsafe.arrayIndexScale(byte[].class), vmArrayIndexScale(byte[].class),
"Unsafe.arrayIndexScale(byte[])");
check(unsafe.arrayIndexScale(char[].class), vmArrayIndexScale(char[].class),
"Unsafe.arrayIndexScale(char[])");
check(unsafe.arrayIndexScale(double[].class), vmArrayIndexScale(double[].class),
"Unsafe.arrayIndexScale(double[])");
check(unsafe.arrayIndexScale(float[].class), vmArrayIndexScale(float[].class),
"Unsafe.arrayIndexScale(float[])");
check(unsafe.arrayIndexScale(int[].class), vmArrayIndexScale(int[].class),
"Unsafe.arrayIndexScale(int[])");
check(unsafe.arrayIndexScale(long[].class), vmArrayIndexScale(long[].class),
"Unsafe.arrayIndexScale(long[])");
check(unsafe.arrayIndexScale(Object[].class), vmArrayIndexScale(Object[].class),
"Unsafe.arrayIndexScale(Object[])");
}
private static void testGetAndPutAndCAS(Unsafe unsafe) throws NoSuchFieldException {
TestClass t = new TestClass();
int intValue = 12345678;
Field intField = TestClass.class.getDeclaredField("intVar");
long intOffset = unsafe.objectFieldOffset(intField);
check(unsafe.getInt(t, intOffset), 0, "Unsafe.getInt(Object, long) - initial");
unsafe.putInt(t, intOffset, intValue);
check(t.intVar, intValue, "Unsafe.putInt(Object, long, int)");
check(unsafe.getInt(t, intOffset), intValue, "Unsafe.getInt(Object, long)");
long longValue = 1234567887654321L;
Field longField = TestClass.class.getDeclaredField("longVar");
long longOffset = unsafe.objectFieldOffset(longField);
check(unsafe.getLong(t, longOffset), 0, "Unsafe.getLong(Object, long) - initial");
unsafe.putLong(t, longOffset, longValue);
check(t.longVar, longValue, "Unsafe.putLong(Object, long, long)");
check(unsafe.getLong(t, longOffset), longValue, "Unsafe.getLong(Object, long)");
Object objectValue = new Object();
Field objectField = TestClass.class.getDeclaredField("objectVar");
long objectOffset = unsafe.objectFieldOffset(objectField);
check(unsafe.getObject(t, objectOffset), null, "Unsafe.getObject(Object, long) - initial");
unsafe.putObject(t, objectOffset, objectValue);
check(t.objectVar, objectValue, "Unsafe.putObject(Object, long, Object)");
check(unsafe.getObject(t, objectOffset), objectValue, "Unsafe.getObject(Object, long)");
if (unsafe.compareAndSwapInt(t, intOffset, 0, 1)) {
System.out.println("Unexpectedly succeeding compareAndSwapInt(t, intOffset, 0, 1)");
}
if (!unsafe.compareAndSwapInt(t, intOffset, intValue, 0)) {
System.out.println(
"Unexpectedly not succeeding compareAndSwapInt(t, intOffset, intValue, 0)");
}
if (!unsafe.compareAndSwapInt(t, intOffset, 0, 1)) {
System.out.println("Unexpectedly not succeeding compareAndSwapInt(t, intOffset, 0, 1)");
}
// Exercise sun.misc.Unsafe.compareAndSwapInt using the same
// integer (1) for the `expectedValue` and `newValue` arguments.
if (!unsafe.compareAndSwapInt(t, intOffset, 1, 1)) {
System.out.println("Unexpectedly not succeeding compareAndSwapInt(t, intOffset, 1, 1)");
}
if (unsafe.compareAndSwapLong(t, longOffset, 0, 1)) {
System.out.println("Unexpectedly succeeding compareAndSwapLong(t, longOffset, 0, 1)");
}
if (!unsafe.compareAndSwapLong(t, longOffset, longValue, 0)) {
System.out.println(
"Unexpectedly not succeeding compareAndSwapLong(t, longOffset, longValue, 0)");
}
if (!unsafe.compareAndSwapLong(t, longOffset, 0, 1)) {
System.out.println("Unexpectedly not succeeding compareAndSwapLong(t, longOffset, 0, 1)");
}
// Exercise sun.misc.Unsafe.compareAndSwapLong using the same
// integer (1) for the `expectedValue` and `newValue` arguments.
if (!unsafe.compareAndSwapLong(t, longOffset, 1, 1)) {
System.out.println("Unexpectedly not succeeding compareAndSwapLong(t, longOffset, 1, 1)");
}
// We do not use `null` as argument to sun.misc.Unsafe.compareAndSwapObject
// in those tests, as this value is not affected by heap poisoning
// (which uses address negation to poison and unpoison heap object
// references). This way, when heap poisoning is enabled, we can
// better exercise its implementation within that method.
if (unsafe.compareAndSwapObject(t, objectOffset, new Object(), new Object())) {
System.out.println("Unexpectedly succeeding " +
"compareAndSwapObject(t, objectOffset, new Object(), new Object())");
}
Object objectValue2 = new Object();
if (!unsafe.compareAndSwapObject(t, objectOffset, objectValue, objectValue2)) {
System.out.println("Unexpectedly not succeeding " +
"compareAndSwapObject(t, objectOffset, objectValue, objectValue2)");
}
Object objectValue3 = new Object();
if (!unsafe.compareAndSwapObject(t, objectOffset, objectValue2, objectValue3)) {
System.out.println("Unexpectedly not succeeding " +
"compareAndSwapObject(t, objectOffset, objectValue2, objectValue3)");
}
// Exercise sun.misc.Unsafe.compareAndSwapObject using the same
// object (`objectValue3`) for the `expectedValue` and `newValue` arguments.
if (!unsafe.compareAndSwapObject(t, objectOffset, objectValue3, objectValue3)) {
System.out.println("Unexpectedly not succeeding " +
"compareAndSwapObject(t, objectOffset, objectValue3, objectValue3)");
}
// Exercise sun.misc.Unsafe.compareAndSwapObject using the same
// object (`t`) for the `obj` and `newValue` arguments.
if (!unsafe.compareAndSwapObject(t, objectOffset, objectValue3, t)) {
System.out.println(
"Unexpectedly not succeeding compareAndSwapObject(t, objectOffset, objectValue3, t)");
}
// Exercise sun.misc.Unsafe.compareAndSwapObject using the same
// object (`t`) for the `obj`, `expectedValue` and `newValue` arguments.
if (!unsafe.compareAndSwapObject(t, objectOffset, t, t)) {
System.out.println("Unexpectedly not succeeding compareAndSwapObject(t, objectOffset, t, t)");
}
// Exercise sun.misc.Unsafe.compareAndSwapObject using the same
// object (`t`) for the `obj` and `expectedValue` arguments.
if (!unsafe.compareAndSwapObject(t, objectOffset, t, new Object())) {
System.out.println(
"Unexpectedly not succeeding compareAndSwapObject(t, objectOffset, t, new Object())");
}
}
private static void testGetAndPutVolatile(Unsafe unsafe) throws NoSuchFieldException {
TestVolatileClass tv = new TestVolatileClass();
int intValue = 12345678;
Field volatileIntField = TestVolatileClass.class.getDeclaredField("volatileIntVar");
long volatileIntOffset = unsafe.objectFieldOffset(volatileIntField);
check(unsafe.getIntVolatile(tv, volatileIntOffset),
0,
"Unsafe.getIntVolatile(Object, long) - initial");
unsafe.putIntVolatile(tv, volatileIntOffset, intValue);
check(tv.volatileIntVar, intValue, "Unsafe.putIntVolatile(Object, long, int)");
check(unsafe.getIntVolatile(tv, volatileIntOffset),
intValue,
"Unsafe.getIntVolatile(Object, long)");
long longValue = 1234567887654321L;
Field volatileLongField = TestVolatileClass.class.getDeclaredField("volatileLongVar");
long volatileLongOffset = unsafe.objectFieldOffset(volatileLongField);
check(unsafe.getLongVolatile(tv, volatileLongOffset),
0,
"Unsafe.getLongVolatile(Object, long) - initial");
unsafe.putLongVolatile(tv, volatileLongOffset, longValue);
check(tv.volatileLongVar, longValue, "Unsafe.putLongVolatile(Object, long, long)");
check(unsafe.getLongVolatile(tv, volatileLongOffset),
longValue,
"Unsafe.getLongVolatile(Object, long)");
Object objectValue = new Object();
Field volatileObjectField = TestVolatileClass.class.getDeclaredField("volatileObjectVar");
long volatileObjectOffset = unsafe.objectFieldOffset(volatileObjectField);
check(unsafe.getObjectVolatile(tv, volatileObjectOffset),
null,
"Unsafe.getObjectVolatile(Object, long) - initial");
unsafe.putObjectVolatile(tv, volatileObjectOffset, objectValue);
check(tv.volatileObjectVar, objectValue, "Unsafe.putObjectVolatile(Object, long, Object)");
check(unsafe.getObjectVolatile(tv, volatileObjectOffset),
objectValue,
"Unsafe.getObjectVolatile(Object, long)");
}
private static class TestClass {
public int intVar = 0;
public long longVar = 0;
public Object objectVar = null;
}
private static class TestVolatileClass {
public volatile int volatileIntVar = 0;
public volatile long volatileLongVar = 0;
public volatile Object volatileObjectVar = null;
}
private static native int vmArrayBaseOffset(Class clazz);
private static native int vmArrayIndexScale(Class clazz);
}
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