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/*
* Copyright (c) 2014, 2024, 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
* @run testng VarHandleTestReflection
*/
import org.testng.annotations.DataProvider;
import org.testng.annotations.Test;
import java.lang.invoke.MethodHandle;
import java.lang.invoke.MethodHandleInfo;
import java.lang.invoke.MethodHandles;
import java.lang.invoke.VarHandle;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.stream.Stream;
public class VarHandleTestReflection extends VarHandleBaseTest {
String string;
@DataProvider
public static Object[][] accessModesProvider() {
return Stream.of(VarHandle.AccessMode.values()).
map(am -> new Object[]{am}).
toArray(Object[][]::new);
}
static VarHandle handle() throws Exception {
return MethodHandles.lookup().
findVarHandle(VarHandleTestReflection.class, "string", String.class);
}
@Test(dataProvider = "accessModesProvider", expectedExceptions = IllegalArgumentException.class)
public void methodInvocationArgumentMismatch(VarHandle.AccessMode accessMode) throws Exception {
VarHandle v = handle();
// Try a reflective invoke using a Method, with no arguments
Method vhm = VarHandle.class.getMethod(accessMode.methodName(), Object[].class);
vhm.invoke(v, new Object[]{});
}
@Test(dataProvider = "accessModesProvider")
public void methodInvocationMatchingArguments(VarHandle.AccessMode accessMode) throws Exception {
VarHandle v = handle();
// Try a reflective invoke using a Method, with the minimal required arguments
Method vhm = VarHandle.class.getMethod(accessMode.methodName(), Object[].class);
Object arg = new Object[0];
try {
vhm.invoke(v, arg);
} catch (InvocationTargetException e) {
if (!(e.getCause() instanceof UnsupportedOperationException)) {
throw new RuntimeException("expected UnsupportedOperationException but got: "
+ e.getCause().getClass().getName(), e);
}
}
}
@Test(dataProvider = "accessModesProvider", expectedExceptions = UnsupportedOperationException.class)
public void methodHandleInvoke(VarHandle.AccessMode accessMode) throws Throwable {
VarHandle v = handle();
// Try a reflective invoke using a MethodHandle
MethodHandle mh = MethodHandles.lookup().unreflect(
VarHandle.class.getMethod(accessMode.methodName(), Object[].class));
// Use invoke to avoid WrongMethodTypeException for
// non-signature-polymorphic return types
Object o = (Object) mh.invoke(v, new Object[]{});
}
@Test(dataProvider = "accessModesProvider", expectedExceptions = IllegalArgumentException.class)
public void methodInvocationFromMethodInfo(VarHandle.AccessMode accessMode) throws Exception {
VarHandle v = handle();
// Try a reflective invoke using a Method obtained from cracking
// a MethodHandle
MethodHandle mh = MethodHandles.lookup().unreflect(
VarHandle.class.getMethod(accessMode.methodName(), Object[].class));
MethodHandleInfo info = MethodHandles.lookup().revealDirect(mh);
Method im = info.reflectAs(Method.class, MethodHandles.lookup());
im.invoke(v, new Object[]{});
}
@Test(dataProvider = "accessModesProvider", expectedExceptions = IllegalArgumentException.class)
public void reflectAsFromVarHandleInvoker(VarHandle.AccessMode accessMode) throws Exception {
VarHandle v = handle();
MethodHandle mh = MethodHandles.varHandleInvoker(
accessMode, v.accessModeType(accessMode));
MethodHandleInfo info = MethodHandles.lookup().revealDirect(mh);
info.reflectAs(Method.class, MethodHandles.lookup());
}
@Test(dataProvider = "accessModesProvider", expectedExceptions = IllegalArgumentException.class)
public void reflectAsFromFindVirtual(VarHandle.AccessMode accessMode) throws Exception {
VarHandle v = handle();
MethodHandle mh = MethodHandles.publicLookup().findVirtual(
VarHandle.class, accessMode.methodName(), v.accessModeType(accessMode));
MethodHandleInfo info = MethodHandles.lookup().revealDirect(mh);
info.reflectAs(Method.class, MethodHandles.lookup());
}
}
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