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/*
* Copyright (c) 2014, 2017, 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 LFGarbageCollectedTest
* @bug 8046703
* @key randomness
* @ignore 8078602
* @summary Test verifies that lambda forms are garbage collected
* @author kshefov
* @library /lib/testlibrary /java/lang/invoke/common
* @build jdk.test.lib.TimeLimitedRunner
* @build TestMethods
* @build LambdaFormTestCase
* @build LFGarbageCollectedTest
* @run main/othervm -Xmx64m
* -XX:SoftRefLRUPolicyMSPerMB=0
* -XX:+HeapDumpOnOutOfMemoryError
* -DHEAP_DUMP=false
* LFGarbageCollectedTest
*/
import java.lang.invoke.MethodHandle;
import java.lang.invoke.MethodType;
import java.lang.ref.PhantomReference;
import java.lang.ref.Reference;
import java.lang.ref.ReferenceQueue;
import java.lang.reflect.InvocationTargetException;
import java.util.EnumSet;
import java.util.Map;
/**
* Lambda forms garbage collection test class.
*/
public final class LFGarbageCollectedTest extends LambdaFormTestCase {
private static boolean HEAP_DUMP = Boolean.getBoolean("HEAP_DUMP");
/**
* Constructor for a lambda forms garbage collection test case.
*
* @param testMethod A method from {@code j.l.i.MethodHandles} class that
* returns a {@code j.l.i.MethodHandle} instance.
*/
public LFGarbageCollectedTest(TestMethods testMethod) {
super(testMethod);
}
PhantomReference ph;
ReferenceQueue rq = new ReferenceQueue();
MethodType mtype;
Map<String, Object> data;
@Override
public void doTest() {
try {
TestMethods testCase = getTestMethod();
data = testCase.getTestCaseData();
MethodHandle adapter;
try {
adapter = testCase.getTestCaseMH(data, TestMethods.Kind.ONE);
} catch (NoSuchMethodException ex) {
throw new Error("Unexpected exception", ex);
}
mtype = adapter.type();
Object lambdaForm = INTERNAL_FORM.invoke(adapter);
if (lambdaForm == null) {
throw new Error("Unexpected error: Lambda form of the method handle is null");
}
String kind = KIND_FIELD.get(lambdaForm).toString();
if (kind.equals("IDENTITY")) {
// Ignore identity LambdaForms.
return;
}
ph = new PhantomReference(lambdaForm, rq);
lambdaForm = null;
adapter = null;
collectLambdaForm();
} catch (IllegalAccessException | IllegalArgumentException |
InvocationTargetException ex) {
throw new Error("Unexpected exception", ex);
}
}
private void collectLambdaForm() throws IllegalAccessException {
// Usually, 2 System.GCs are necessary to enqueue a SoftReference.
System.gc();
System.gc();
Reference ref = null;
for (int i = 0; i < 10; i++) {
try {
ref = rq.remove(1000);
} catch (InterruptedException e) {
/* ignore */
}
if (ref != null) {
break;
}
System.gc(); // If the reference hasn't been queued yet, trigger one more GC.
}
if (ref == null) {
dumpTestData();
System.err.println("Method type: " + mtype);
System.err.println("LambdaForm: " + REF_FIELD.get(ph));
if (HEAP_DUMP) {
// Trigger OOM to force heap dump for post-mortem analysis.
val = new long[1_000_000_000];
}
throw new AssertionError("Error: LambdaForm is not garbage collected");
};
}
private void dumpTestData() {
System.err.println("Test case: " + getTestMethod());
for (String s : data.keySet()) {
System.err.printf("\t%20s => %s\n", s, data.get(s));
}
}
private static long[] val;
/**
* Main routine for lambda forms garbage collection test.
*
* @param args Accepts no arguments.
*/
public static void main(String[] args) {
// The "identity", "constant", "arrayElementGetter" and "arrayElementSetter"
// methods should be removed from this test,
// because their lambda forms are stored in a static field and are not GC'ed.
// There can be only a finite number of such LFs for each method,
// so no memory leak happens.
EnumSet<TestMethods> testMethods = EnumSet.complementOf(EnumSet.of(
TestMethods.IDENTITY,
TestMethods.CONSTANT,
TestMethods.ARRAY_ELEMENT_GETTER,
TestMethods.ARRAY_ELEMENT_SETTER,
TestMethods.EXACT_INVOKER,
TestMethods.INVOKER));
LambdaFormTestCase.runTests(LFGarbageCollectedTest::new, testMethods);
}
}
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