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ThrowingUpcall.java
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ThrowingUpcall.java
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/*
* Copyright (c) 2021, 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.
*/
import jdk.incubator.foreign.CLinker;
import jdk.incubator.foreign.FunctionDescriptor;
import jdk.incubator.foreign.MemoryAddress;
import jdk.incubator.foreign.ResourceScope;
import jdk.incubator.foreign.SymbolLookup;
import java.lang.invoke.MethodHandle;
import java.lang.invoke.MethodHandles;
import java.lang.invoke.MethodType;
import static jdk.incubator.foreign.CLinker.C_POINTER;
public class ThrowingUpcall {
private static final MethodHandle downcall;
private static final MethodHandle MH_throwException;
static {
System.loadLibrary("TestUpcall");
SymbolLookup lookup = SymbolLookup.loaderLookup();
downcall = CLinker.getInstance().downcallHandle(
lookup.lookup("f0_V__").orElseThrow(),
MethodType.methodType(void.class, MemoryAddress.class),
FunctionDescriptor.ofVoid(C_POINTER)
);
try {
MH_throwException = MethodHandles.lookup().findStatic(ThrowingUpcall.class, "throwException",
MethodType.methodType(void.class));
} catch (ReflectiveOperationException e) {
throw new ExceptionInInitializerError(e);
}
}
public static void throwException() throws Throwable {
throw new Throwable("Testing upcall exceptions");
}
public static void main(String[] args) throws Throwable {
test();
}
public static void test() throws Throwable {
try (ResourceScope scope = ResourceScope.newConfinedScope()) {
MemoryAddress stub = CLinker.getInstance().upcallStub(MH_throwException, FunctionDescriptor.ofVoid(), scope);
downcall.invokeExact(stub); // should call System.exit(1);
}
}
}