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products/Sources/formale Sprachen/Java/Openjdk/test/jdk/java/foreign/ (Sun/Oracle ^©) Datei vom 13.11.2022 mit Größe 3 kB

Quelle TestUpcallStructScope.java Sprache: JAVA

/*
* Copyright (c) 2020, 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.
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*/

/*
* @test
* @enablePreview
* @requires ((os.arch == "amd64" | os.arch == "x86_64") & sun.arch.data.model == "64") | os.arch == "aarch64"
*
* @run testng/othervm/native
*   --enable-native-access=ALL-UNNAMED
*   -Djdk.internal.foreign.ProgrammableInvoker.USE_SPEC=false
*   TestUpcallStructScope
* @run testng/othervm/native
*   --enable-native-access=ALL-UNNAMED
*   -Djdk.internal.foreign.ProgrammableInvoker.USE_SPEC=true
*   TestUpcallStructScope
*/

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

import org.testng.annotations.Test;

import java.lang.invoke.MethodHandle;
import java.lang.invoke.MethodHandles;
import java.lang.invoke.MethodType;
import java.util.concurrent.atomic.AtomicReference;
import java.util.function.Consumer;

import static org.testng.Assert.assertFalse;

public class TestUpcallStructScope extends NativeTestHelper {
    static final MethodHandle MH_do_upcall;
    static final Linker LINKER = Linker.nativeLinker();
    static final MethodHandle MH_Consumer_accept;

    // 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")
    );

    static {
        System.loadLibrary("TestUpcallStructScope");
        MH_do_upcall = LINKER.downcallHandle(
                findNativeOrThrow("do_upcall"),
                FunctionDescriptor.ofVoid(C_POINTER, S_PDI_LAYOUT)
        );

        try {
            MH_Consumer_accept = MethodHandles.publicLookup().findVirtual(Consumer.class, "accept",
                    MethodType.methodType(void.class, Object.class));
        } catch (NoSuchMethodException | IllegalAccessException e) {
            throw new RuntimeException(e);
        }
    }

    private static MethodHandle methodHandle (Consumer<MemorySegment> callback) {
        return MH_Consumer_accept.bindTo(callback).asType(MethodType.methodType(void.class, MemorySegment.class));
    }

    @Test
    public void testUpcall() throws Throwable {
        AtomicReference<MemorySegment> capturedSegment = new AtomicReference<>();
        MethodHandle target = methodHandle(capturedSegment::set);
        FunctionDescriptor upcallDesc = FunctionDescriptor.ofVoid(S_PDI_LAYOUT);
        try (Arena arena = Arena.openConfined()) {
            MemorySegment upcallStub = LINKER.upcallStub(target, upcallDesc, arena.scope());
            MemorySegment argSegment = MemorySegment.allocateNative(S_PDI_LAYOUT, arena.scope());;
            MH_do_upcall.invoke(upcallStub, argSegment);
        }

        MemorySegment captured = capturedSegment.get();
        assertFalse(captured.scope().isAlive());
    }

}

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