/*
* Copyright ( c ) 2014 , 2020 , 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
* @ key randomness
* @ bug 8058744
* @ summary Invalid pattern - matching of address computations in raw unsafe
* @ library / test / lib
* @ modules java . base / jdk . internal . misc
* java . management
* @ run main / othervm - Xbatch compiler . unsafe . UnsafeRaw
*/
package compiler.unsafe;
import jdk.internal.misc.Unsafe;
import jdk.test.lib.Utils;
import java.util.Random;
public class UnsafeRaw {
public static class Tests {
public static int int_index(Unsafe unsafe, long base, int index) throws Exception {
return unsafe.getInt(base + (index << 2 ));
}
public static int long_index(Unsafe unsafe, long base, long index) throws Exception {
return unsafe.getInt(base + (index << 2 ));
}
public static int int_index_back_ashift(Unsafe unsafe, long base, int index) throws Exception {
return unsafe.getInt(base + (index >> 2 ));
}
public static int int_index_back_lshift(Unsafe unsafe, long base, int index) throws Exception {
return unsafe.getInt(base + (index >>> 2 ));
}
public static int long_index_back_ashift(Unsafe unsafe, long base, long index) throws Exception {
return unsafe.getInt(base + (index >> 2 ));
}
public static int long_index_back_lshift(Unsafe unsafe, long base, long index) throws Exception {
return unsafe.getInt(base + (index >>> 2 ));
}
public static int int_const_12345678_index(Unsafe unsafe, long base) throws Exception {
int idx4 = 0 x12345678;
return unsafe.getInt(base + idx4);
}
public static int long_const_1234567890abcdef_index(Unsafe unsafe, long base) throws Exception {
long idx5 = 0 x1234567890abcdefL;
return unsafe.getInt(base + idx5);
}
public static int int_index_mul(Unsafe unsafe, long base, int index) throws Exception {
return unsafe.getInt(base + (index * 4 ));
}
public static int long_index_mul(Unsafe unsafe, long base, long index) throws Exception {
return unsafe.getInt(base + (index * 4 ));
}
public static int int_index_mul_scale_16(Unsafe unsafe, long base, int index) throws Exception {
return unsafe.getInt(base + (index * 16 ));
}
public static int long_index_mul_scale_16(Unsafe unsafe, long base, long index) throws Exception {
return unsafe.getInt(base + (index * 16 ));
}
}
public static void main(String[] args) throws Exception {
Unsafe unsafe = Unsafe.getUnsafe();
final int array_size = 128 ;
final int element_size = 4 ;
final int magic = 0 x12345678;
Random rnd = Utils.getRandomInstance();
long array = unsafe.allocateMemory(array_size * element_size); // 128 ints
long addr = array + array_size * element_size / 2 ; // something in the middle to work with
unsafe.putInt(addr, magic);
for (int j = 0 ; j < 100000 ; j++) {
if (Tests.int_index(unsafe, addr, 0 ) != magic) throw new Exception();
if (Tests.long_index(unsafe, addr, 0 ) != magic) throw new Exception();
if (Tests.int_index_mul(unsafe, addr, 0 ) != magic) throw new Exception();
if (Tests.long_index_mul(unsafe, addr, 0 ) != magic) throw new Exception();
{
long idx1 = rnd.nextLong();
long addr1 = addr - (idx1 << 2 );
if (Tests.long_index(unsafe, addr1, idx1) != magic) throw new Exception();
}
{
long idx2 = rnd.nextLong();
long addr2 = addr - (idx2 >> 2 );
if (Tests.long_index_back_ashift(unsafe, addr2, idx2) != magic) throw new Exception();
}
{
long idx3 = rnd.nextLong();
long addr3 = addr - (idx3 >>> 2 );
if (Tests.long_index_back_lshift(unsafe, addr3, idx3) != magic) throw new Exception();
}
{
long idx4 = 0 x12345678;
long addr4 = addr - idx4;
if (Tests.int_const_12345678_index(unsafe, addr4) != magic) throw new Exception();
}
{
long idx5 = 0 x1234567890abcdefL;
long addr5 = addr - idx5;
if (Tests.long_const_1234567890abcdef_index(unsafe, addr5) != magic) throw new Exception();
}
{
int idx6 = rnd.nextInt();
long addr6 = addr - (idx6 >> 2 );
if (Tests.int_index_back_ashift(unsafe, addr6, idx6) != magic) throw new Exception();
}
{
int idx7 = rnd.nextInt();
long addr7 = addr - (idx7 >>> 2 );
if (Tests.int_index_back_lshift(unsafe, addr7, idx7) != magic) throw new Exception();
}
{
int idx8 = rnd.nextInt();
long addr8 = addr - (idx8 * 16 );
if (Tests.int_index_mul_scale_16(unsafe, addr8, idx8) != magic) throw new Exception();
}
{
long idx9 = rnd.nextLong();
long addr9 = addr - (idx9 * 16 );
if (Tests.long_index_mul_scale_16(unsafe, addr9, idx9) != magic) throw new Exception();
}
}
}
}
Messung V0.5 in Prozent C=98 H=83 G=90
¤ Dauer der Verarbeitung: 0.12 Sekunden
(vorverarbeitet am 2026-10-01)
¤
*© Formatika GbR, Deutschland