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/*
* Copyright (c) 2018, 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
* @summary unit tests for java.lang.invoke.MethodHandles
* @library /lib/testlibrary /java/lang/invoke/common
* @compile MethodHandlesTest.java MethodHandlesCastFailureTest.java remote/RemoteExample.java
* @run junit/othervm/timeout=2500 -XX:+IgnoreUnrecognizedVMOptions
* -XX:-VerifyDependencies
* -esa
* test.java.lang.invoke.MethodHandlesCastFailureTest
*/
package test.java.lang.invoke;
import org.junit.*;
import test.java.lang.invoke.lib.CodeCacheOverflowProcessor;
import java.lang.invoke.MethodHandle;
import java.lang.invoke.MethodHandles;
import java.lang.invoke.MethodType;
import static org.junit.Assert.*;
public class MethodHandlesCastFailureTest extends MethodHandlesTest {
@Test // SLOW
public void testCastFailure() throws Throwable {
CodeCacheOverflowProcessor.runMHTest(this::testCastFailure0);
}
public void testCastFailure0() throws Throwable {
if (CAN_SKIP_WORKING) return;
startTest("testCastFailure");
testCastFailure("cast/argument", 11000);
if (CAN_TEST_LIGHTLY) return;
testCastFailure("unbox/argument", 11000);
testCastFailure("cast/return", 11000);
testCastFailure("unbox/return", 11000);
}
static class Surprise {
public MethodHandle asMethodHandle() {
return VALUE.bindTo(this);
}
Object value(Object x) {
trace("value", x);
if (boo != null) return boo;
return x;
}
Object boo;
void boo(Object x) { boo = x; }
static void trace(String x, Object y) {
if (verbosity > 8) System.out.println(x+"="+y);
}
static Object refIdentity(Object x) { trace("ref.x", x); return x; }
static Integer boxIdentity(Integer x) { trace("box.x", x); return x; }
static int intIdentity(int x) { trace("int.x", x); return x; }
static MethodHandle VALUE, REF_IDENTITY, BOX_IDENTITY, INT_IDENTITY;
static {
try {
VALUE = PRIVATE.findVirtual(
Surprise.class, "value",
MethodType.methodType(Object.class, Object.class));
REF_IDENTITY = PRIVATE.findStatic(
Surprise.class, "refIdentity",
MethodType.methodType(Object.class, Object.class));
BOX_IDENTITY = PRIVATE.findStatic(
Surprise.class, "boxIdentity",
MethodType.methodType(Integer.class, Integer.class));
INT_IDENTITY = PRIVATE.findStatic(
Surprise.class, "intIdentity",
MethodType.methodType(int.class, int.class));
} catch (NoSuchMethodException | IllegalAccessException ex) {
throw new RuntimeException(ex);
}
}
}
@SuppressWarnings("ConvertToStringSwitch")
void testCastFailure(String mode, int okCount) throws Throwable {
countTest(false);
if (verbosity > 2) System.out.println("mode="+mode);
Surprise boo = new Surprise();
MethodHandle identity = Surprise.REF_IDENTITY, surprise0 = boo.asMethodHandle(), surprise = surprise0;
if (mode.endsWith("/return")) {
if (mode.equals("unbox/return")) {
// fail on return to ((Integer)surprise).intValue
surprise = surprise.asType(MethodType.methodType(int.class, Object.class));
identity = identity.asType(MethodType.methodType(int.class, Object.class));
} else if (mode.equals("cast/return")) {
// fail on return to (Integer)surprise
surprise = surprise.asType(MethodType.methodType(Integer.class, Object.class));
identity = identity.asType(MethodType.methodType(Integer.class, Object.class));
}
} else if (mode.endsWith("/argument")) {
MethodHandle callee = null;
if (mode.equals("unbox/argument")) {
// fail on handing surprise to int argument
callee = Surprise.INT_IDENTITY;
} else if (mode.equals("cast/argument")) {
// fail on handing surprise to Integer argument
callee = Surprise.BOX_IDENTITY;
}
if (callee != null) {
callee = callee.asType(MethodType.genericMethodType(1));
surprise = MethodHandles.filterArguments(callee, 0, surprise);
identity = MethodHandles.filterArguments(callee, 0, identity);
}
}
assertNotSame(mode, surprise, surprise0);
identity = identity.asType(MethodType.genericMethodType(1));
surprise = surprise.asType(MethodType.genericMethodType(1));
Object x = 42;
for (int i = 0; i < okCount; i++) {
Object y = identity.invokeExact(x);
assertEquals(x, y);
Object z = surprise.invokeExact(x);
assertEquals(x, z);
}
boo.boo("Boo!");
Object y = identity.invokeExact(x);
assertEquals(x, y);
try {
Object z = surprise.invokeExact(x);
System.out.println("Failed to throw; got z="+z);
assertTrue(false);
} catch (ClassCastException ex) {
if (verbosity > 2)
System.out.println("caught "+ex);
if (verbosity > 3)
ex.printStackTrace(System.out);
assertTrue(true); // all is well
}
}
}
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