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* Copyright (c) 2015, 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
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*
* This code is distributed in the hope that it will be useful, but WITHOUT
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* 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.
*
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*/
/*
* @test
* @bug 8143628
* @summary Test unsafe access for char
*
* @modules java.base/jdk.internal.misc:+open
* @run testng/othervm -Diters=100 -Xint compiler.unsafe.JdkInternalMiscUnsafeAccessTestChar
* @run testng/othervm -Diters=20000 -XX:TieredStopAtLevel=1 compiler.unsafe.JdkInternalMiscUnsafeAccessTestChar
* @run testng/othervm -Diters=20000 -XX:-TieredCompilation compiler.unsafe.JdkInternalMiscUnsafeAccessTestChar
* @run testng/othervm -Diters=20000 compiler.unsafe.JdkInternalMiscUnsafeAccessTestChar
*/
package compiler.unsafe;
import org.testng.annotations.Test;
import java.lang.reflect.Field;
import static org.testng.Assert.*;
public class JdkInternalMiscUnsafeAccessTestChar {
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 = JdkInternalMiscUnsafeAccessTestChar.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 = JdkInternalMiscUnsafeAccessTestChar.class.getDeclaredField("v");
V_OFFSET = UNSAFE.objectFieldOffset(vField);
} catch (Exception e) {
throw new RuntimeException(e);
}
ARRAY_OFFSET = UNSAFE.arrayBaseOffset(char[].class);
int ascale = UNSAFE.arrayIndexScale(char[].class);
ARRAY_SHIFT = 31 - Integer.numberOfLeadingZeros(ascale);
}
static char static_v;
char v;
@Test
public void testFieldInstance() {
JdkInternalMiscUnsafeAccessTestChar t = new JdkInternalMiscUnsafeAccessTestChar();
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() {
char[] array = new char[10];
for (int c = 0; c < ITERS; c++) {
for (int i = 0; i < array.length; i++) {
testAccess(array, (((long) i) << ARRAY_SHIFT) + ARRAY_OFFSET);
}
}
}
@Test
public void testArrayOffHeap() {
int size = 10;
long address = UNSAFE.allocateMemory(size << ARRAY_SHIFT);
try {
for (int c = 0; c < ITERS; c++) {
for (int i = 0; i < size; i++) {
testAccess(null, (((long) i) << ARRAY_SHIFT) + address);
}
}
} finally {
UNSAFE.freeMemory(address);
}
}
@Test
public void testArrayOffHeapDirect() {
int size = 10;
long address = UNSAFE.allocateMemory(size << ARRAY_SHIFT);
try {
for (int c = 0; c < ITERS; c++) {
for (int i = 0; i < size; i++) {
testAccess((((long) i) << ARRAY_SHIFT) + address);
}
}
} finally {
UNSAFE.freeMemory(address);
}
}
static void testAccess(Object base, long offset) {
// Plain
{
UNSAFE.putChar(base, offset, '\u0123');
char x = UNSAFE.getChar(base, offset);
assertEquals(x, '\u0123', "set char value");
}
// Volatile
{
UNSAFE.putCharVolatile(base, offset, '\u4567');
char x = UNSAFE.getCharVolatile(base, offset);
assertEquals(x, '\u4567', "putVolatile char value");
}
// Lazy
{
UNSAFE.putCharRelease(base, offset, '\u0123');
char x = UNSAFE.getCharAcquire(base, offset);
assertEquals(x, '\u0123', "putRelease char value");
}
// Opaque
{
UNSAFE.putCharOpaque(base, offset, '\u4567');
char x = UNSAFE.getCharOpaque(base, offset);
assertEquals(x, '\u4567', "putOpaque char value");
}
// Unaligned
{
UNSAFE.putCharUnaligned(base, offset, '\u4567');
char x = UNSAFE.getCharUnaligned(base, offset);
assertEquals(x, '\u4567', "putUnaligned char value");
}
{
UNSAFE.putCharUnaligned(base, offset, '\u0123', true);
char x = UNSAFE.getCharUnaligned(base, offset, true);
assertEquals(x, '\u0123', "putUnaligned big endian char value");
}
{
UNSAFE.putCharUnaligned(base, offset, '\u4567', false);
char x = UNSAFE.getCharUnaligned(base, offset, false);
assertEquals(x, '\u4567', "putUnaligned little endian char value");
}
UNSAFE.putChar(base, offset, '\u0123');
// Compare
{
boolean r = UNSAFE.compareAndSwapChar(base, offset, '\u0123', '\u4567');
assertEquals(r, true, "success compareAndSwap char");
char x = UNSAFE.getChar(base, offset);
assertEquals(x, '\u4567', "success compareAndSwap char value");
}
{
boolean r = UNSAFE.compareAndSwapChar(base, offset, '\u0123', '\u89AB');
assertEquals(r, false, "failing compareAndSwap char");
char x = UNSAFE.getChar(base, offset);
assertEquals(x, '\u4567', "failing compareAndSwap char value");
}
// Advanced compare
{
char r = UNSAFE.compareAndExchangeCharVolatile(base, offset, '\u4567', '\u0123');
assertEquals(r, '\u4567', "success compareAndExchangeVolatile char");
char x = UNSAFE.getChar(base, offset);
assertEquals(x, '\u0123', "success compareAndExchangeVolatile char value");
}
{
char r = UNSAFE.compareAndExchangeCharVolatile(base, offset, '\u4567', '\u89AB');
assertEquals(r, '\u0123', "failing compareAndExchangeVolatile char");
char x = UNSAFE.getChar(base, offset);
assertEquals(x, '\u0123', "failing compareAndExchangeVolatile char value");
}
{
char r = UNSAFE.compareAndExchangeCharAcquire(base, offset, '\u0123', '\u4567');
assertEquals(r, '\u0123', "success compareAndExchangeAcquire char");
char x = UNSAFE.getChar(base, offset);
assertEquals(x, '\u4567', "success compareAndExchangeAcquire char value");
}
{
char r = UNSAFE.compareAndExchangeCharAcquire(base, offset, '\u0123', '\u89AB');
assertEquals(r, '\u4567', "failing compareAndExchangeAcquire char");
char x = UNSAFE.getChar(base, offset);
assertEquals(x, '\u4567', "failing compareAndExchangeAcquire char value");
}
{
char r = UNSAFE.compareAndExchangeCharRelease(base, offset, '\u4567', '\u0123');
assertEquals(r, '\u4567', "success compareAndExchangeRelease char");
char x = UNSAFE.getChar(base, offset);
assertEquals(x, '\u0123', "success compareAndExchangeRelease char value");
}
{
char r = UNSAFE.compareAndExchangeCharRelease(base, offset, '\u4567', '\u89AB');
assertEquals(r, '\u0123', "failing compareAndExchangeRelease char");
char x = UNSAFE.getChar(base, offset);
assertEquals(x, '\u0123', "failing compareAndExchangeRelease char value");
}
{
boolean success = false;
for (int c = 0; c < WEAK_ATTEMPTS && !success; c++) {
success = UNSAFE.weakCompareAndSwapChar(base, offset, '\u0123', '\u4567');
}
assertEquals(success, true, "weakCompareAndSwap char");
char x = UNSAFE.getChar(base, offset);
assertEquals(x, '\u4567', "weakCompareAndSwap char value");
}
{
boolean success = false;
for (int c = 0; c < WEAK_ATTEMPTS && !success; c++) {
success = UNSAFE.weakCompareAndSwapCharAcquire(base, offset, '\u4567', '\u0123');
}
assertEquals(success, true, "weakCompareAndSwapAcquire char");
char x = UNSAFE.getChar(base, offset);
assertEquals(x, '\u0123', "weakCompareAndSwapAcquire char");
}
{
boolean success = false;
for (int c = 0; c < WEAK_ATTEMPTS && !success; c++) {
success = UNSAFE.weakCompareAndSwapCharRelease(base, offset, '\u0123', '\u4567');
}
assertEquals(success, true, "weakCompareAndSwapRelease char");
char x = UNSAFE.getChar(base, offset);
assertEquals(x, '\u4567', "weakCompareAndSwapRelease char");
}
{
boolean success = false;
for (int c = 0; c < WEAK_ATTEMPTS && !success; c++) {
success = UNSAFE.weakCompareAndSwapCharVolatile(base, offset, '\u4567', '\u0123');
}
assertEquals(success, true, "weakCompareAndSwapVolatile char");
char x = UNSAFE.getChar(base, offset);
assertEquals(x, '\u0123', "weakCompareAndSwapVolatile char");
}
UNSAFE.putChar(base, offset, '\u4567');
// Compare set and get
{
char o = UNSAFE.getAndSetChar(base, offset, '\u0123');
assertEquals(o, '\u4567', "getAndSet char");
char x = UNSAFE.getChar(base, offset);
assertEquals(x, '\u0123', "getAndSet char value");
}
UNSAFE.putChar(base, offset, '\u0123');
// get and add, add and get
{
char o = UNSAFE.getAndAddChar(base, offset, '\u4567');
assertEquals(o, '\u0123', "getAndAdd char");
char x = UNSAFE.getChar(base, offset);
assertEquals(x, (char)('\u0123' + '\u4567'), "getAndAdd char");
}
}
static void testAccess(long address) {
// Plain
{
UNSAFE.putChar(address, '\u0123');
char x = UNSAFE.getChar(address);
assertEquals(x, '\u0123', "set char value");
}
}
}