jdk-24/test/jdk/java/foreign/MemoryLayoutPrincipalTotalityTest.java

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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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/*
 * @test
 * @run testng/othervm MemoryLayoutPrincipalTotalityTest
 */

import org.testng.annotations.*;

import java.lang.foreign.*;

import static java.lang.foreign.ValueLayout.*;
import static org.testng.Assert.*;

public class MemoryLayoutPrincipalTotalityTest {

    // The tests in this class is mostly there to ensure compile-time pattern matching totality.

    @Test
    public void testBasicTotality() {
        MemoryLayout memoryLayout = javaIntMemoryLayout();
        int v0 = switch (memoryLayout) {
            case MemoryLayout ml -> 1;
        };
        assertEquals(v0, 1);
    }

    @Test
    public void testMLRemovedTotality() {
        MemoryLayout memoryLayout = javaIntMemoryLayout();
        var v1 = switch (memoryLayout) {
            case GroupLayout gl -> 0;
            case PaddingLayout pl -> 0; // leaf
            case SequenceLayout sl -> 0; // leaf
            case ValueLayout vl -> 1;
        };
        assertEquals(v1, 1);
    }

    @Test
    public void testMLGLRemovedTotality() {
        MemoryLayout memoryLayout = javaIntMemoryLayout();
        var v2 = switch (memoryLayout) {
            case PaddingLayout pl -> 0; // leaf
            case SequenceLayout sl -> 0; // leaf
            case ValueLayout vl -> 1;
            case StructLayout sl -> 0; // leaf
            case UnionLayout ul -> 0; // leaf
        };
        assertEquals(v2, 1);
    }

    @Test
    public void testMLGLVLRemovedTotality() {
        MemoryLayout memoryLayout = javaIntMemoryLayout();
        var v3 = switch (memoryLayout) {
            case PaddingLayout pl -> 0; // leaf
            case SequenceLayout sl -> 0; // leaf
            case StructLayout sl -> 0; // leaf
            case UnionLayout ul -> 0; // leaf
            case AddressLayout oa -> 0; // leaf
            case OfBoolean ob -> 0; // leaf
            case OfByte ob -> 0; // leaf
            case OfChar oc -> 0; // leaf
            case OfDouble od -> 0; // leaf
            case OfFloat of -> 0; // leaf
            case OfInt oi -> 1; // leaf
            case OfLong ol -> 0; // leaf
            case OfShort os -> 0; // leaf
        };
        assertEquals(v3, 1);
    }

    @Test
    public void testMLVLRemovedTotality() {
        MemoryLayout memoryLayout = javaIntMemoryLayout();
        var v4 = switch (memoryLayout) {
            case GroupLayout gl -> 0;
            case PaddingLayout pl -> 0; // leaf
            case SequenceLayout sl -> 0; // leaf
            case AddressLayout oa -> 0; // leaf
            case OfBoolean ob -> 0; // leaf
            case OfByte ob -> 0; // leaf
            case OfChar oc -> 0; // leaf
            case OfDouble od -> 0; // leaf
            case OfFloat of -> 0; // leaf
            case OfInt oi -> 1; // leaf
            case OfLong ol -> 0; // leaf
            case OfShort os -> 0; // leaf
        };
        assertEquals(v4, 1);
    }

    private static MemoryLayout javaIntMemoryLayout() {
        return JAVA_INT;
    }

}