Add tests

test/jdk/java/foreign/jniSupport/TestJNISupport.java

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+/*
+ * Copyright (c) 2023, 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
+ * @library ../ /test/lib
+ * @build NativeTestHelper
+ * @run testng/othervm --enable-native-access=ALL-UNNAMED TestJNISupport
+ */
+
+import org.testng.annotations.Test;
+
+import java.lang.foreign.Arena;
+import java.lang.foreign.JNISupport;
+import java.lang.foreign.FunctionDescriptor;
+import java.lang.foreign.MemorySegment;
+import java.lang.invoke.MethodHandle;
+
+import static org.testng.Assert.*;
+
+public class TestJNISupport extends NativeTestHelper {
+
+    static {
+        System.loadLibrary("JNISupport");
+    }
+
+    private record Widget(int x) {}
+
+    @Test
+    public void testUpcallWithRef() throws Throwable {
+        MethodHandle upcallWithRef = downcallHandle("upcall_with_ref", FunctionDescriptor.ofVoid(C_POINTER, C_POINTER));
+
+        try (Arena arena = Arena.ofConfined()) {
+            MemorySegment ref = JNISupport.newGlobalRef(new Widget(42), arena);
+            MemorySegment stub = upcallStub(TestJNISupport.class, "target", FunctionDescriptor.ofVoid(C_POINTER));
+
+            upcallWithRef.invokeExact(ref, stub);
+        }
+    }
+
+    public static void target(MemorySegment ref) {
+        Widget w = (Widget) JNISupport.resolveGlobalRef(ref);
+
+        assertEquals(w.x(), 42);
+    }
+}

test/jdk/java/foreign/jniSupport/libJNISupport.c

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+/*
+ * Copyright (c) 2023, 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.
+ */
+
+#ifdef _WIN64
+#define EXPORT __declspec(dllexport)
+#else
+#define EXPORT
+#endif
+
+EXPORT void upcall_with_ref(void* ref, void(*cb)(void*)) {
+  cb(ref);
+}