80 lines
3.0 KiB
Java
80 lines
3.0 KiB
Java
/*
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* Copyright (c) 2022, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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import java.lang.foreign.MemorySegment;
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import java.lang.foreign.MemorySession;
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import java.io.File;
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import java.io.IOException;
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import java.nio.ByteBuffer;
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import java.nio.channels.FileChannel;
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import java.nio.file.Path;
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import static java.nio.file.StandardOpenOption.*;
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/*
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* @test
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* @enablePreview
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* @bug 8286637
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* @summary Ensure that memory mapping beyond 32-bit range does not cause an
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* EXCEPTION_ACCESS_VIOLATION.
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* @run main/othervm LargeMapTest
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*/
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public class LargeMapTest {
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private static final String FILE = "test.dat";
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private static final long LENGTH = 8000000000L;
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private static final long OFFSET = 3704800000L;
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private static final int BUFSIZ = 100000;
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public static void main(String[] args) throws IOException {
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System.out.println(System.getProperty("sun.arch.data.model"));
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System.out.println(System.getProperty("os.arch"));
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System.out.println(System.getProperty("java.version"));
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Path p = Path.of(FILE);
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p.toFile().deleteOnExit();
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try (FileChannel fc = FileChannel.open(p, CREATE, WRITE)) {
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fc.position(LENGTH - 1);
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fc.write(ByteBuffer.wrap(new byte[] {27}));
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}
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long offset = OFFSET;
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ByteBuffer bb = ByteBuffer.allocateDirect(BUFSIZ);
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try (FileChannel fc = FileChannel.open(p, READ, WRITE);) {
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MemorySegment mbb = MemorySegment.ofBuffer(bb);
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MemorySegment mappedMemorySegment =
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fc.map(FileChannel.MapMode.READ_WRITE, 0, p.toFile().length(),
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MemorySession.openImplicit());
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final int interval = BUFSIZ*1000;
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while (offset < LENGTH) {
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if (offset % interval == 0)
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System.out.println("offset: " + offset);
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MemorySegment target = mappedMemorySegment.asSlice(offset, BUFSIZ);
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offset = offset + BUFSIZ;
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target.copyFrom(mbb);
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}
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}
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}
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}
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