Quelle  TestUpcallHighArity.java   Sprache: JAVA

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 *
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 *  published by the Free Software Foundation.
 *
 *  This code is distributed in the hope that it will be useful, but WITHOUT
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 *  version 2 for more details (a copy is included in the LICENSE file that
 *  accompanied this code).
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/*
 * @test
 * @enablePreview
 * @requires ((os.arch == "amd64" | os.arch == "x86_64") & sun.arch.data.model == "64") | os.arch == "aarch64"
 * @build NativeTestHelper CallGeneratorHelper TestUpcallHighArity
 *
 * @run testng/othervm/native
 *   --enable-native-access=ALL-UNNAMED
 *   TestUpcallHighArity
 */

import java.lang.foreign.Arena;
import java.lang.foreign.FunctionDescriptor;
import java.lang.foreign.GroupLayout;
import java.lang.foreign.Linker;
import java.lang.foreign.MemoryLayout;
import java.lang.foreign.MemorySegment;

import org.testng.annotations.DataProvider;
import org.testng.annotations.Test;

import java.lang.foreign.SegmentScope;
import java.lang.invoke.MethodHandle;
import java.lang.invoke.MethodHandles;
import java.lang.invoke.MethodType;
import java.util.List;
import java.util.concurrent.atomic.AtomicReference;

import static org.testng.Assert.assertEquals;

public class TestUpcallHighArity extends CallGeneratorHelper {
    static final MethodHandle MH_do_upcall;
    static final MethodHandle MH_passAndSave;
    static final Linker LINKER = Linker.nativeLinker();

    // struct S_PDI { void* p0; double p1; int p2; };
    static final MemoryLayout S_PDI_LAYOUT = MemoryLayout.structLayout(
        C_POINTER.withName("p0"),
        C_DOUBLE.withName("p1"),
        C_INT.withName("p2"),
        MemoryLayout.paddingLayout(32)
    );

    static {
        try {
            System.loadLibrary("TestUpcallHighArity");
            MH_do_upcall = LINKER.downcallHandle(
                    findNativeOrThrow("do_upcall"),
                    FunctionDescriptor.ofVoid(C_POINTER,
                    S_PDI_LAYOUT, C_INT, C_DOUBLE, C_POINTER,
                    S_PDI_LAYOUT, C_INT, C_DOUBLE, C_POINTER,
                    S_PDI_LAYOUT, C_INT, C_DOUBLE, C_POINTER,
                    S_PDI_LAYOUT, C_INT, C_DOUBLE, C_POINTER)
            );
            MH_passAndSave = MethodHandles.lookup().findStatic(TestUpcallHighArity.class, "passAndSave",
                    MethodType.methodType(void.class, Object[].class, AtomicReference.class, List.class));
        } catch (ReflectiveOperationException e) {
            throw new InternalError(e);
        }
    }

    static void passAndSave(Object[] o, AtomicReference<Object[]> ref, List<MemoryLayout> layouts) {
        for (int i = 0; i < o.length; i++) {
            if (layouts.get(i) instanceof GroupLayout) {
                MemorySegment ms = (MemorySegment) o[i];
                MemorySegment copy = MemorySegment.allocateNative(ms.byteSize(), SegmentScope.auto());
                copy.copyFrom(ms);
                o[i] = copy;
            }
        }
        ref.set(o);
    }

    @Test(dataProvider = "args")
    public void testUpcall(MethodHandle downcall, MethodType upcallType,
                           FunctionDescriptor upcallDescriptor) throws Throwable {
        AtomicReference<Object[]> capturedArgs = new AtomicReference<>();
        MethodHandle target = MethodHandles.insertArguments(MH_passAndSave, 1, capturedArgs, upcallDescriptor.argumentLayouts())
                                         .asCollector(Object[].class, upcallType.parameterCount())
                                         .asType(upcallType);
        try (Arena arena = Arena.openConfined()) {
            MemorySegment upcallStub = LINKER.upcallStub(target, upcallDescriptor, arena.scope());
            Object[] args = new Object[upcallType.parameterCount() + 1];
            args[0] = upcallStub;
            List<MemoryLayout> argLayouts = upcallDescriptor.argumentLayouts();
            for (int i = 1; i < args.length; i++) {
                args[i] = makeArg(argLayouts.get(i - 1), null, false);
            }

            downcall.invokeWithArguments(args);

            Object[] capturedArgsArr = capturedArgs.get();
            for (int i = 0; i < capturedArgsArr.length; i++) {
                if (upcallDescriptor.argumentLayouts().get(i) instanceof GroupLayout) {
                    assertStructEquals((MemorySegment) capturedArgsArr[i], (MemorySegment) args[i + 1], argLayouts.get(i));
                } else {
                    assertEquals(capturedArgsArr[i], args[i + 1], "For index " + i);
                }
            }
        }
    }

    @DataProvider
    public static Object[][] args() {
        return new Object[][]{
            { MH_do_upcall,
                MethodType.methodType(void.class,
                    MemorySegment.class, int.class, double.class, MemorySegment.class,
                    MemorySegment.class, int.class, double.class, MemorySegment.class,
                    MemorySegment.class, int.class, double.class, MemorySegment.class,
                    MemorySegment.class, int.class, double.class, MemorySegment.class),
                FunctionDescriptor.ofVoid(
                    S_PDI_LAYOUT, C_INT, C_DOUBLE, C_POINTER,
                    S_PDI_LAYOUT, C_INT, C_DOUBLE, C_POINTER,
                    S_PDI_LAYOUT, C_INT, C_DOUBLE, C_POINTER,
                    S_PDI_LAYOUT, C_INT, C_DOUBLE, C_POINTER)
            }
        };
    }

}