Quelle TestHeapAlignment.java Sprache: JAVA

/*
*  Copyright (c) 2021, 2022, 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
* @enablePreview
* @requires ((os.arch == "amd64" | os.arch == "x86_64") & sun.arch.data.model == "64") | os.arch == "aarch64"
* @run testng/othervm --enable-native-access=ALL-UNNAMED TestHeapAlignment
*/

import java.lang.foreign.MemoryLayout;
import java.lang.foreign.MemorySegment;
import java.lang.foreign.SegmentScope;
import java.lang.foreign.ValueLayout;
import java.util.ArrayList;
import java.util.List;
import java.util.function.Function;
import org.testng.annotations.DataProvider;
import org.testng.annotations.Test;

import static org.testng.Assert.fail;

public class TestHeapAlignment {

    @Test(dataProvider = "layouts")
    public void testHeapAlignment(MemorySegment segment, int align, Object val, Object arr, ValueLayout layout, Function<Object, MemorySegment> segmentFactory) {
        assertAligned(align, layout, () -> layout.varHandle().get(segment));
        assertAligned(align, layout, () -> layout.varHandle().set(segment, val));
        MemoryLayout seq = MemoryLayout.sequenceLayout(10, layout);
        assertAligned(align, layout, () -> seq.varHandle(MemoryLayout.PathElement.sequenceElement()).get(segment, 0L));
        assertAligned(align, layout, () -> seq.varHandle(MemoryLayout.PathElement.sequenceElement()).set(segment, 0L, val));
        assertAligned(align, layout, () -> segment.spliterator(layout));
        if (arr != null) {
            assertAligned(align, layout, () -> MemorySegment.copy(arr, 0, segment, layout, 0, 1));
            assertAligned(align, layout, () -> MemorySegment.copy(segment, layout, 0, arr, 0, 1));
            assertAligned(align, layout, () -> {
                MemorySegment other = segmentFactory.apply(arr);
                MemorySegment.copy(other, layout, 0, segment, layout, 0, 1);
            });
            MemorySegment other = segmentFactory.apply(arr);
            assertAligned(align, layout, () -> {
                MemorySegment.copy(segment, layout, 0, other, layout, 0, 1);
            });
            assertAligned(align, layout, () -> {
                MemorySegment.copy(other, layout, 0, segment, layout, 0, 1);
            });
        }
    }

    static void assertAligned(int align, ValueLayout layout, Runnable runnable) {
        boolean shouldFail = layout.byteAlignment() > align && align != -1;
        try {
            runnable.run();
            if (shouldFail) {
                fail("Should not get here!");
            }
        } catch (IllegalArgumentException ex) {
            if (!shouldFail) {
                fail("Should not get here!");
            } else if (!ex.getMessage().contains("alignment") && !ex.getMessage().contains("Misaligned")) {
                fail("Unexpected exception: " + ex);
            }
        }
    }

    static final ValueLayout.OfChar JAVA_CHAR_ALIGNED = ValueLayout.JAVA_CHAR.withBitAlignment(16);
    static final ValueLayout.OfShort JAVA_SHORT_ALIGNED = ValueLayout.JAVA_SHORT.withBitAlignment(16);
    static final ValueLayout.OfInt JAVA_INT_ALIGNED = ValueLayout.JAVA_INT.withBitAlignment(32);
    static final ValueLayout.OfFloat JAVA_FLOAT_ALIGNED = ValueLayout.JAVA_FLOAT.withBitAlignment(32);
    static final ValueLayout.OfLong JAVA_LONG_ALIGNED = ValueLayout.JAVA_LONG.withBitAlignment(64);
    static final ValueLayout.OfDouble JAVA_DOUBLE_ALIGNED = ValueLayout.JAVA_DOUBLE.withBitAlignment(64);
    static final ValueLayout.OfAddress ADDRESS_ALIGNED = ValueLayout.ADDRESS.withBitAlignment(ValueLayout.ADDRESS.bitSize());

    enum SegmentAndAlignment {
        HEAP_BYTE(MemorySegment.ofArray(new byte[8]), 1),
        HEAP_SHORT(MemorySegment.ofArray(new short[4]), 2),
        HEAP_CHAR(MemorySegment.ofArray(new char[4]), 2),
        HEAP_INT(MemorySegment.ofArray(new int[2]), 4),
        HEAP_FLOAT(MemorySegment.ofArray(new float[2]), 4),
        HEAP_LONG(MemorySegment.ofArray(new long[1]), 8),
        HEAP_DOUBLE(MemorySegment.ofArray(new double[1]), 8),
        NATIVE(MemorySegment.allocateNative(8, SegmentScope.auto()), -1);

        final MemorySegment segment;
        final int align;

        SegmentAndAlignment(MemorySegment segment, int align) {
            this.segment = segment;
            this.align = align;
        }
    }

    @DataProvider
    public static Object[][] layouts() {
        List<Object[]> layouts = new ArrayList<>();
        for (SegmentAndAlignment testCase : SegmentAndAlignment.values()) {
            layouts.add(new Object[] { testCase.segment, testCase.align, (byte) 42, new byte[]{42}, ValueLayout.JAVA_BYTE, (Function<byte[], MemorySegment>)MemorySegment::ofArray });
            layouts.add(new Object[] { testCase.segment, testCase.align, true, null, ValueLayout.JAVA_BOOLEAN, null });
            layouts.add(new Object[] { testCase.segment, testCase.align, (char) 42, new char[]{42}, JAVA_CHAR_ALIGNED, (Function<char[], MemorySegment>)MemorySegment::ofArray });
            layouts.add(new Object[] { testCase.segment, testCase.align, (short) 42, new short[]{42}, JAVA_SHORT_ALIGNED, (Function<short[], MemorySegment>)MemorySegment::ofArray });
            layouts.add(new Object[] { testCase.segment, testCase.align, 42, new int[]{42}, JAVA_INT_ALIGNED, (Function<int[], MemorySegment>)MemorySegment::ofArray });
            layouts.add(new Object[] { testCase.segment, testCase.align, 42f, new float[]{42}, JAVA_FLOAT_ALIGNED, (Function<float[], MemorySegment>)MemorySegment::ofArray });
            layouts.add(new Object[] { testCase.segment, testCase.align, 42L, new long[]{42}, JAVA_LONG_ALIGNED, (Function<long[], MemorySegment>)MemorySegment::ofArray });
            layouts.add(new Object[] { testCase.segment, testCase.align, 42d, new double[]{42}, JAVA_DOUBLE_ALIGNED, (Function<double[], MemorySegment>)MemorySegment::ofArray });
            layouts.add(new Object[] { testCase.segment, testCase.align, MemorySegment.ofAddress(42), null, ADDRESS_ALIGNED, null });
        }
        return layouts.toArray(new Object[0][]);
    }
}

quality99%

¤ Dauer der Verarbeitung: 0.1 Sekunden (vorverarbeitet) ¤

Wurzel

Suchen

Beweissystem der NASA

Beweissystem Isabelle

NIST Cobol Testsuite

Cephes Mathematical Library

Wiener Entwicklungsmethode

Haftungshinweis

Die Informationen auf dieser Webseite wurden nach bestem Wissen sorgfältig zusammengestellt. Es wird jedoch weder Vollständigkeit, noch Richtigkeit, noch Qualität der bereit gestellten Informationen zugesichert.

Bemerkung:

Die farbliche Syntaxdarstellung ist noch experimentell.