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// Copyright (c) 2019, the R8 project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.
package com.android.tools.r8.classmerging;
import static com.android.tools.r8.utils.codeinspector.Matchers.isPresent;
import static org.hamcrest.MatcherAssert.assertThat;
import com.android.tools.r8.CompilationFailedException;
import com.android.tools.r8.TestBase;
import com.android.tools.r8.TestParameters;
import com.android.tools.r8.TestParametersCollection;
import com.android.tools.r8.ToolHelper.DexVm.Version;
import java.io.IOException;
import java.lang.Thread.State;
import java.util.concurrent.ExecutionException;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.Parameterized;
import org.junit.runners.Parameterized.Parameters;
@RunWith(Parameterized.class)
public class VerticalClassMergerSynchronizedBlockWithArraysTest extends TestBase {
private final TestParameters parameters;
@Parameters(name = "{0}")
public static TestParametersCollection data() {
// The 4.0.4 runtime will flakily mark threads as blocking and report DEADLOCKED.
return getTestParameters()
.withDexRuntimesStartingFromExcluding(Version.V4_0_4)
.withAllApiLevels()
.build();
}
public VerticalClassMergerSynchronizedBlockWithArraysTest(TestParameters parameters) {
this.parameters = parameters;
}
@Test
public void testOnRuntime() throws IOException, CompilationFailedException, ExecutionException {
testForRuntime(parameters.getRuntime(), parameters.getApiLevel())
.addInnerClasses(VerticalClassMergerSynchronizedBlockWithArraysTest.class)
.run(parameters.getRuntime(), Main.class)
.assertSuccessWithOutput("Hello World!");
}
@Test
public void testNoMergingOfClassUsedInMonitor()
throws IOException, CompilationFailedException, ExecutionException {
testForR8(parameters.getBackend())
.addInnerClasses(VerticalClassMergerSynchronizedBlockWithArraysTest.class)
.addKeepMainRule(Main.class)
.setMinApi(parameters.getApiLevel())
.run(parameters.getRuntime(), Main.class)
.assertSuccessWithOutput("Hello World!")
.inspect(inspector -> assertThat(inspector.clazz(LockOne.class), isPresent()));
}
abstract static class LockOne {}
static class LockTwo extends LockOne {}
static class LockThree {}
public static class Main {
private static volatile boolean inLockThreeCritical = false;
private static volatile boolean inLockTwoCritical = false;
private static volatile boolean arnoldWillNotBeBack = false;
private static volatile Thread t1 = new Thread(Main::lockThreeThenOne);
private static volatile Thread t2 = new Thread(Main::lockTwoThenThree);
private static volatile Thread t3 = new Thread(Main::arnold);
static void synchronizedAccessThroughLocks(String arg) {
System.out.print(arg);
}
public static void main(String[] args) {
t1.start();
t2.start();
// This thread is started to ensure termination in case we are rewriting incorrectly.
t3.start();
while (!arnoldWillNotBeBack) {}
}
static void lockThreeThenOne() {
synchronized (LockThree[].class) {
inLockThreeCritical = true;
while (!inLockTwoCritical) {}
synchronized (LockOne[].class) {
synchronizedAccessThroughLocks("Hello ");
}
}
}
static void lockTwoThenThree() {
synchronized (LockTwo[].class) {
inLockTwoCritical = true;
while (!inLockThreeCritical) {}
synchronized (LockThree[].class) {
synchronizedAccessThroughLocks("World!");
}
}
}
static void arnold() {
while (t1.getState() != State.TERMINATED || t2.getState() != State.TERMINATED) {
if (t1.getState() == State.BLOCKED && t2.getState() == State.BLOCKED) {
System.err.println("DEADLOCKED!");
System.exit(1);
break;
}
}
arnoldWillNotBeBack = true;
}
}
}