mirror of
https://github.com/openjdk/jdk.git
synced 2026-04-04 12:08:36 +00:00
106 lines
3.3 KiB
Java
106 lines
3.3 KiB
Java
/*
|
|
* Copyright (c) 2026, 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.
|
|
*/
|
|
|
|
/*
|
|
* @test
|
|
* @bug 8377541
|
|
* @summary Test that membars are eliminated when loading from a stable array.
|
|
* @library /test/lib /
|
|
* @modules java.base/jdk.internal.misc
|
|
* @modules java.base/jdk.internal.vm.annotation
|
|
* @run driver ${test.main.class}
|
|
*/
|
|
|
|
package compiler.stable;
|
|
|
|
import java.util.Objects;
|
|
|
|
import jdk.internal.misc.Unsafe;
|
|
import jdk.internal.vm.annotation.Stable;
|
|
|
|
import compiler.lib.ir_framework.*;
|
|
|
|
public class TestStableArrayMembars {
|
|
|
|
private static final Unsafe UNSAFE = Unsafe.getUnsafe();
|
|
|
|
public static void main(String[] args) {
|
|
TestFramework tf = new TestFramework();
|
|
tf.addTestClassesToBootClassPath();
|
|
tf.addFlags( "--add-exports=java.base/jdk.internal.misc=ALL-UNNAMED");
|
|
tf.start();
|
|
}
|
|
|
|
static final class LazyIntArray {
|
|
@Stable
|
|
private final Integer[] arr;
|
|
|
|
LazyIntArray() {
|
|
this.arr = new Integer[10];
|
|
}
|
|
|
|
@ForceInline
|
|
Integer get(int idx) {
|
|
Integer i = contentsAcquire(offsetFor(idx));
|
|
return i == null ? slowPath(arr, idx) : i;
|
|
}
|
|
|
|
@ForceInline
|
|
private Integer contentsAcquire(long offset) {
|
|
return (Integer) UNSAFE.getReferenceAcquire(arr, offset);
|
|
}
|
|
|
|
@ForceInline
|
|
private static long offsetFor(long index) {
|
|
return Unsafe.ARRAY_OBJECT_BASE_OFFSET + Unsafe.ARRAY_OBJECT_INDEX_SCALE * index;
|
|
}
|
|
|
|
static Integer slowPath(final Integer[] array, final int index) {
|
|
final long offset = offsetFor(index);
|
|
final Integer t = array[index];
|
|
if (t == null) {
|
|
final Integer newValue = Integer.valueOf(42);
|
|
Objects.requireNonNull(newValue);
|
|
set(array, index, newValue);
|
|
|
|
return newValue;
|
|
}
|
|
return t;
|
|
}
|
|
|
|
static void set(Integer[] array, int index, Integer newValue) {
|
|
if (array[index] == null) {
|
|
UNSAFE.putReferenceRelease(array, Unsafe.ARRAY_OBJECT_BASE_OFFSET + Unsafe.ARRAY_OBJECT_INDEX_SCALE * (long) index, newValue);
|
|
}
|
|
}
|
|
}
|
|
|
|
static final LazyIntArray la = new LazyIntArray();
|
|
|
|
@Test
|
|
@IR(failOn = { IRNode.LOAD, IRNode.MEMBAR })
|
|
static Integer test() {
|
|
return la.get(0);
|
|
}
|
|
}
|