79 lines
2.3 KiB
Java
79 lines
2.3 KiB
Java
/*
|
|
* Copyright (c) 2024, 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 8316756
|
|
* @summary Test UNSAFE.copyMemory in combination with Escape Analysis
|
|
* @library /test/lib
|
|
*
|
|
* @modules java.base/jdk.internal.misc
|
|
*
|
|
* @run main/othervm -XX:-TieredCompilation -Xbatch -XX:CompileCommand=quiet -XX:CompileCommand=compileonly,compiler.unsafe.UnsafeArrayCopy::test*
|
|
* compiler.unsafe.UnsafeArrayCopy
|
|
*/
|
|
|
|
package compiler.unsafe;
|
|
|
|
import java.lang.reflect.*;
|
|
import java.util.*;
|
|
|
|
import jdk.internal.misc.Unsafe;
|
|
|
|
|
|
public class UnsafeArrayCopy {
|
|
|
|
private static Unsafe UNSAFE = Unsafe.getUnsafe();
|
|
|
|
static long SRC_BASE = UNSAFE.allocateMemory(4);
|
|
static long DST_BASE = UNSAFE.allocateMemory(4);
|
|
|
|
static class MyClass {
|
|
int x;
|
|
}
|
|
|
|
static int test() {
|
|
MyClass obj = new MyClass(); // Non-escaping to trigger Escape Analysis
|
|
UNSAFE.copyMemory(null, SRC_BASE, null, DST_BASE, 4);
|
|
obj.x = 42;
|
|
return obj.x;
|
|
}
|
|
|
|
static int[] test2() {
|
|
int[] src = new int[4];
|
|
int[] dst = new int[4];
|
|
MyClass obj = new MyClass();
|
|
UNSAFE.copyMemory(src, 0, dst, 0, 4);
|
|
obj.x = 42;
|
|
dst[1] = obj.x;
|
|
return dst;
|
|
}
|
|
|
|
public static void main(String[] args) {
|
|
for (int i = 0; i < 50_000; ++i) {
|
|
test();
|
|
test2();
|
|
}
|
|
}
|
|
}
|