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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* version 2 for more details (a copy is included in the LICENSE file that
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* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
/*
* @test
* @bug 8143628
* @summary Test unsafe access for Object
*
* @modules java.base/jdk.internal.misc:+open
* @run testng/othervm -Diters=100 -Xint compiler.unsafe.JdkInternalMiscUnsafeAccessTestObject
* @run testng/othervm -Diters=20000 -XX:TieredStopAtLevel=1 compiler.unsafe.JdkInternalMiscUnsafeAccessTestObject
* @run testng/othervm -Diters=20000 -XX:-TieredCompilation compiler.unsafe.JdkInternalMiscUnsafeAccessTestObject
* @run testng/othervm -Diters=20000 compiler.unsafe.JdkInternalMiscUnsafeAccessTestObject
*/
package compiler.unsafe;
import org.testng.annotations.Test;
import java.lang.reflect.Field;
import static org.testng.Assert.*;
public class JdkInternalMiscUnsafeAccessTestObject {
static final int ITERS = Integer.getInteger("iters", 1);
static final int WEAK_ATTEMPTS = Integer.getInteger("weakAttempts", 10);
static final jdk.internal.misc.Unsafe UNSAFE;
static final long V_OFFSET;
static final Object STATIC_V_BASE;
static final long STATIC_V_OFFSET;
static int ARRAY_OFFSET;
static int ARRAY_SHIFT;
static {
try {
Field f = jdk.internal.misc.Unsafe.class.getDeclaredField("theUnsafe");
f.setAccessible(true);
UNSAFE = (jdk.internal.misc.Unsafe) f.get(null);
} catch (Exception e) {
throw new RuntimeException("Unable to get Unsafe instance.", e);
}
try {
Field staticVField = JdkInternalMiscUnsafeAccessTestObject.class.getDeclaredField("static_v");
STATIC_V_BASE = UNSAFE.staticFieldBase(staticVField);
STATIC_V_OFFSET = UNSAFE.staticFieldOffset(staticVField);
} catch (Exception e) {
throw new RuntimeException(e);
}
try {
Field vField = JdkInternalMiscUnsafeAccessTestObject.class.getDeclaredField("v");
V_OFFSET = UNSAFE.objectFieldOffset(vField);
} catch (Exception e) {
throw new RuntimeException(e);
}
ARRAY_OFFSET = UNSAFE.arrayBaseOffset(Object[].class);
int ascale = UNSAFE.arrayIndexScale(Object[].class);
ARRAY_SHIFT = 31 - Integer.numberOfLeadingZeros(ascale);
}
static Object static_v;
Object v;
@Test
public void testFieldInstance() {
JdkInternalMiscUnsafeAccessTestObject t = new JdkInternalMiscUnsafeAccessTestObject();
for (int c = 0; c < ITERS; c++) {
testAccess(t, V_OFFSET);
}
}
@Test
public void testFieldStatic() {
for (int c = 0; c < ITERS; c++) {
testAccess(STATIC_V_BASE, STATIC_V_OFFSET);
}
}
@Test
public void testArray() {
Object[] array = new Object[10];
for (int c = 0; c < ITERS; c++) {
for (int i = 0; i < array.length; i++) {
testAccess(array, (((long) i) << ARRAY_SHIFT) + ARRAY_OFFSET);
}
}
}
static void testAccess(Object base, long offset) {
// Plain
{
UNSAFE.putObject(base, offset, "foo");
Object x = UNSAFE.getObject(base, offset);
assertEquals(x, "foo", "set Object value");
}
// Volatile
{
UNSAFE.putObjectVolatile(base, offset, "bar");
Object x = UNSAFE.getObjectVolatile(base, offset);
assertEquals(x, "bar", "putVolatile Object value");
}
// Lazy
{
UNSAFE.putObjectRelease(base, offset, "foo");
Object x = UNSAFE.getObjectAcquire(base, offset);
assertEquals(x, "foo", "putRelease Object value");
}
// Opaque
{
UNSAFE.putObjectOpaque(base, offset, "bar");
Object x = UNSAFE.getObjectOpaque(base, offset);
assertEquals(x, "bar", "putOpaque Object value");
}
UNSAFE.putObject(base, offset, "foo");
// Compare
{
boolean r = UNSAFE.compareAndSwapObject(base, offset, "foo", "bar");
assertEquals(r, true, "success compareAndSwap Object");
Object x = UNSAFE.getObject(base, offset);
assertEquals(x, "bar", "success compareAndSwap Object value");
}
{
boolean r = UNSAFE.compareAndSwapObject(base, offset, "foo", "baz");
assertEquals(r, false, "failing compareAndSwap Object");
Object x = UNSAFE.getObject(base, offset);
assertEquals(x, "bar", "failing compareAndSwap Object value");
}
// Advanced compare
{
Object r = UNSAFE.compareAndExchangeObjectVolatile(base, offset, "bar", "foo");
assertEquals(r, "bar", "success compareAndExchangeVolatile Object");
Object x = UNSAFE.getObject(base, offset);
assertEquals(x, "foo", "success compareAndExchangeVolatile Object value");
}
{
Object r = UNSAFE.compareAndExchangeObjectVolatile(base, offset, "bar", "baz");
assertEquals(r, "foo", "failing compareAndExchangeVolatile Object");
Object x = UNSAFE.getObject(base, offset);
assertEquals(x, "foo", "failing compareAndExchangeVolatile Object value");
}
{
Object r = UNSAFE.compareAndExchangeObjectAcquire(base, offset, "foo", "bar");
assertEquals(r, "foo", "success compareAndExchangeAcquire Object");
Object x = UNSAFE.getObject(base, offset);
assertEquals(x, "bar", "success compareAndExchangeAcquire Object value");
}
{
Object r = UNSAFE.compareAndExchangeObjectAcquire(base, offset, "foo", "baz");
assertEquals(r, "bar", "failing compareAndExchangeAcquire Object");
Object x = UNSAFE.getObject(base, offset);
assertEquals(x, "bar", "failing compareAndExchangeAcquire Object value");
}
{
Object r = UNSAFE.compareAndExchangeObjectRelease(base, offset, "bar", "foo");
assertEquals(r, "bar", "success compareAndExchangeRelease Object");
Object x = UNSAFE.getObject(base, offset);
assertEquals(x, "foo", "success compareAndExchangeRelease Object value");
}
{
Object r = UNSAFE.compareAndExchangeObjectRelease(base, offset, "bar", "baz");
assertEquals(r, "foo", "failing compareAndExchangeRelease Object");
Object x = UNSAFE.getObject(base, offset);
assertEquals(x, "foo", "failing compareAndExchangeRelease Object value");
}
{
boolean success = false;
for (int c = 0; c < WEAK_ATTEMPTS && !success; c++) {
success = UNSAFE.weakCompareAndSwapObject(base, offset, "foo", "bar");
}
assertEquals(success, true, "weakCompareAndSwap Object");
Object x = UNSAFE.getObject(base, offset);
assertEquals(x, "bar", "weakCompareAndSwap Object value");
}
{
boolean success = false;
for (int c = 0; c < WEAK_ATTEMPTS && !success; c++) {
success = UNSAFE.weakCompareAndSwapObjectAcquire(base, offset, "bar", "foo");
}
assertEquals(success, true, "weakCompareAndSwapAcquire Object");
Object x = UNSAFE.getObject(base, offset);
assertEquals(x, "foo", "weakCompareAndSwapAcquire Object");
}
{
boolean success = false;
for (int c = 0; c < WEAK_ATTEMPTS && !success; c++) {
success = UNSAFE.weakCompareAndSwapObjectRelease(base, offset, "foo", "bar");
}
assertEquals(success, true, "weakCompareAndSwapRelease Object");
Object x = UNSAFE.getObject(base, offset);
assertEquals(x, "bar", "weakCompareAndSwapRelease Object");
}
{
boolean success = false;
for (int c = 0; c < WEAK_ATTEMPTS && !success; c++) {
success = UNSAFE.weakCompareAndSwapObjectVolatile(base, offset, "bar", "foo");
}
assertEquals(success, true, "weakCompareAndSwapVolatile Object");
Object x = UNSAFE.getObject(base, offset);
assertEquals(x, "foo", "weakCompareAndSwapVolatile Object");
}
UNSAFE.putObject(base, offset, "bar");
// Compare set and get
{
Object o = UNSAFE.getAndSetObject(base, offset, "foo");
assertEquals(o, "bar", "getAndSet Object");
Object x = UNSAFE.getObject(base, offset);
assertEquals(x, "foo", "getAndSet Object value");
}
}
}