TestLayoutEquality.java

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/*
 * @test
 * @modules jdk.incubator.foreign/jdk.internal.foreign
 *
 * @run testng TestLayoutEquality
 */

import jdk.incubator.foreign.MemoryLayout;
import jdk.incubator.foreign.ValueLayout;
import jdk.internal.foreign.PlatformLayouts;
import org.testng.annotations.DataProvider;
import org.testng.annotations.Test;

import java.lang.reflect.Field;
import java.util.ArrayList;
import java.util.List;

import static org.testng.Assert.*;

public class TestLayoutEquality {

    @Test(dataProvider = "layoutConstants")
    public void testReconstructedEquality(ValueLayout layout) {
        ValueLayout newLayout = MemoryLayout.valueLayout(layout.bitSize(), layout.order());

        // properties should be equal
        assertEquals(newLayout.bitSize(), layout.bitSize());
        assertEquals(newLayout.bitAlignment(), layout.bitAlignment());
        assertEquals(newLayout.name(), layout.name());
        assertEquals(newLayout.attributes().toArray().length, 0);
        assertEquals(layout.attributes().toArray().length, 1);

        // but equals should return false, because one is a ValueLayout with a CLinker kind
        assertNotEquals(newLayout, layout);
    }

    @DataProvider
    public static Object[][] layoutConstants() throws ReflectiveOperationException {
        List<ValueLayout> testValues = new ArrayList<>();

        addLayoutConstants(testValues, PlatformLayouts.SysV.class);
        addLayoutConstants(testValues, PlatformLayouts.Win64.class);
        addLayoutConstants(testValues, PlatformLayouts.AArch64.class);

        return testValues.stream().map(e -> new Object[]{ e }).toArray(Object[][]::new);
    }

    private static void addLayoutConstants(List<ValueLayout> testValues, Class<?> cls) throws ReflectiveOperationException {
        for (Field f : cls.getFields()) {
            if (f.getName().startsWith("C_"))
                testValues.add((ValueLayout) f.get(null));
        }
    }

}