1 /*
2 * Copyright (c) 2022, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
23
24 import jdk.test.lib.RandomFactory;
25
26 import java.lang.foreign.Arena;
27 import java.lang.foreign.MemorySegment;
28
29 import java.io.IOException;
30 import java.nio.ByteBuffer;
31 import java.nio.channels.FileChannel;
32 import java.nio.file.Path;
33 import java.util.Random;
34 import java.util.concurrent.TimeUnit;
35
36 import static java.nio.file.StandardOpenOption.*;
37
38 /*
39 * @test
40 * @enablePreview
41 * @bug 8286637
42 * @summary Ensure that memory mapping beyond 32-bit range does not cause an
43 * EXCEPTION_ACCESS_VIOLATION.
44 * @requires vm.bits == 64
45 * @library /test/lib
46 * @build jdk.test.lib.RandomFactory FileChannelUtils
47 * @run main/othervm LargeMapTest
48 * @key randomness
49 */
50 public class LargeMapTest {
51 private static final long LENGTH = (1L << 32) + 512;
52 private static final int EXTRA = 1024;
53 private static final long BASE = LENGTH - EXTRA;
54 private static final Random GEN = RandomFactory.getRandom();
55
56 public static void main(String[] args) throws IOException {
57 System.out.println(System.getProperty("sun.arch.data.model"));
58 System.out.println(System.getProperty("os.arch"));
59 System.out.println(System.getProperty("java.version"));
60
61 System.out.println(" Writing large file...");
62 long t0 = System.nanoTime();
63 Path p = FileChannelUtils.createSparseTempFile("test", ".dat");
64 p.toFile().deleteOnExit();
65 ByteBuffer bb;
66 try (FileChannel fc = FileChannel.open(p, WRITE)) {
67 fc.position(BASE);
68 byte[] b = new byte[EXTRA];
69 GEN.nextBytes(b);
70 bb = ByteBuffer.wrap(b);
71 fc.write(bb);
72 long t1 = System.nanoTime();
73 System.out.printf(" Wrote large file in %d ns (%d ms) %n",
74 t1 - t0, TimeUnit.NANOSECONDS.toMillis(t1 - t0));
75 }
76 bb.rewind();
77
78 try (FileChannel fc = FileChannel.open(p, READ, WRITE)) {
79 MemorySegment mappedMemorySegment =
80 fc.map(FileChannel.MapMode.READ_WRITE, 0, p.toFile().length(),
81 Arena.ofAuto());
82 MemorySegment target = mappedMemorySegment.asSlice(BASE, EXTRA);
83 if (!target.asByteBuffer().equals(bb)) {
84 throw new RuntimeException("Expected buffers to be equal");
85 }
86 }
87 }
88 }