TestUnsafeUnalignedMismatchedAccesses.java revision 11707:ad7af1afda7a 
1/*
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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7 * published by the Free Software Foundation.
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11 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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24
25/**
26 * @test
27 * @bug 8136473
28 * @summary Mismatched stores on same slice possible with Unsafe.Put*Unaligned methods
29 * @modules java.base/jdk.internal.misc
30 *
31 * @run main/othervm -XX:-UseOnStackReplacement -XX:-BackgroundCompilation
32 *      compiler.intrinsics.unsafe.TestUnsafeUnalignedMismatchedAccesses
33 * @run main/othervm -XX:-UseOnStackReplacement -XX:-BackgroundCompilation
34 *      -XX:+UnlockDiagnosticVMOptions -XX:-UseUnalignedAccesses
35 *      compiler.intrinsics.unsafe.TestUnsafeUnalignedMismatchedAccesses
36 */
37
38package compiler.intrinsics.unsafe;
39
40import jdk.internal.misc.Unsafe;
41
42import java.lang.reflect.Field;
43
44public class TestUnsafeUnalignedMismatchedAccesses {
45
46    private static final Unsafe UNSAFE;
47
48    static {
49        try {
50            Field unsafeField = Unsafe.class.getDeclaredField("theUnsafe");
51            unsafeField.setAccessible(true);
52            UNSAFE = (Unsafe) unsafeField.get(null);
53        }
54        catch (Exception e) {
55            throw new AssertionError(e);
56        }
57    }
58
59    static void test1(byte[] array) {
60        array[0] = 0;
61        UNSAFE.putIntUnaligned(array, UNSAFE.ARRAY_BYTE_BASE_OFFSET, 0);
62        array[0] = 0;
63    }
64
65    static void test2(byte[] array) {
66        array[0] = 0;
67        UNSAFE.putIntUnaligned(array, UNSAFE.ARRAY_BYTE_BASE_OFFSET+1, 0);
68        array[0] = 0;
69    }
70
71    static void test3(byte[] array) {
72        array[0] = 0;
73        UNSAFE.putIntUnaligned(array, UNSAFE.ARRAY_BYTE_BASE_OFFSET+2, 0);
74        array[0] = 0;
75    }
76
77    static void test4(byte[] array) {
78        array[0] = 0;
79        UNSAFE.putIntUnaligned(array, UNSAFE.ARRAY_BYTE_BASE_OFFSET+3, 0);
80        array[0] = 0;
81    }
82
83    static void test5(byte[] array) {
84        array[0] = 0;
85        UNSAFE.putInt(array, UNSAFE.ARRAY_BYTE_BASE_OFFSET, 0);
86        array[0] = 0;
87    }
88
89    // unaligned access and non escaping allocation
90    static void test6() {
91        byte[] array = new byte[10];
92        UNSAFE.putIntUnaligned(array, UNSAFE.ARRAY_BYTE_BASE_OFFSET+1, -1);
93        array[0] = 0;
94    }
95
96    // unaligned access and non escaping allocation
97    static int test7() {
98        byte[] array = new byte[10];
99        UNSAFE.putIntUnaligned(array, UNSAFE.ARRAY_BYTE_BASE_OFFSET+1, -1);
100        array[0] = 0;
101        array[2] = 0;
102        return array[0] + array[1] + array[2] + array[3] + array[4];
103    }
104
105    // unaligned access with vectorization
106    static void test8(int[] src1, int[] src2, int[] dst) {
107        for (int i = 0; i < dst.length-1; i++) {
108            int res = src1[i] + src2[i];
109            UNSAFE.putIntUnaligned(dst, UNSAFE.ARRAY_INT_BASE_OFFSET + i*4+1, res);
110        }
111    }
112
113    static public void main(String[] args) throws Exception {
114        byte[] byte_array = new byte[100];
115        int[] int_array = new int[100];
116        Object[] obj_array = new Object[100];
117        TestUnsafeUnalignedMismatchedAccesses test = new TestUnsafeUnalignedMismatchedAccesses();
118        for (int i = 0; i < 20000; i++) {
119            test1(byte_array);
120            test2(byte_array);
121            test3(byte_array);
122            test4(byte_array);
123            test5(byte_array);
124            test6();
125            test7();
126            test8(int_array, int_array, int_array);
127        }
128    }
129}
130