blob: eede84492dff3438ac7b33da579f07230fe00530 [file] [log] [blame]
/*
* Copyright (C) 2017 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
interface Iface {
public void foo(int i);
}
abstract class Base implements Iface {
// Iface.foo(int) will be added as a miranda method.
void printError(String msg) {
System.out.println(msg);
}
}
class Main1 extends Base {
public void foo(int i) {
if (i != 1) {
printError("error1");
}
}
}
class Main2 extends Main1 {
public void foo(int i) {
if (i != 2) {
printError("error2");
}
}
}
public class Main {
static Base sMain1;
static Base sMain2;
static boolean sIsOptimizing = true;
static boolean sHasJIT = true;
static volatile boolean sOtherThreadStarted;
private static void assertSingleImplementation(Class<?> clazz, String method_name, boolean b) {
if (hasSingleImplementation(clazz, method_name) != b) {
System.out.println(clazz + "." + method_name +
" doesn't have single implementation value of " + b);
}
}
// sMain1.foo() will be always be Main1.foo() before Main2 is loaded/linked.
// So sMain1.foo() can be devirtualized to Main1.foo() and be inlined.
// After Helper.createMain2() which links in Main2, live testOverride() on stack
// should be deoptimized.
static void testOverride(boolean createMain2, boolean wait) {
if (createMain2 && (sIsOptimizing || sHasJIT)) {
assertIsManaged();
}
sMain1.foo(sMain1.getClass() == Main1.class ? 1 : 2);
if (createMain2) {
// Wait for the other thread to start.
while (!sOtherThreadStarted);
// Create an Main2 instance and assign it to sMain2.
// sMain1 is kept the same.
sMain2 = Helper.createMain2();
// Wake up the other thread.
synchronized(Main.class) {
Main.class.notify();
}
} else if (wait) {
// This is the other thread.
synchronized(Main.class) {
sOtherThreadStarted = true;
// Wait for Main2 to be linked and deoptimization is triggered.
try {
Main.class.wait();
} catch (Exception e) {
}
}
}
// There should be a deoptimization here right after Main2 is linked by
// calling Helper.createMain2(), even though sMain1 didn't change.
// The behavior here would be different if inline-cache is used, which
// doesn't deoptimize since sMain1 still hits the type cache.
sMain1.foo(sMain1.getClass() == Main1.class ? 1 : 2);
if ((createMain2 || wait) && sHasJIT && !sIsOptimizing) {
// This method should be deoptimized right after Main2 is created.
assertIsInterpreted();
}
if (sMain2 != null) {
sMain2.foo(sMain2.getClass() == Main1.class ? 1 : 2);
}
}
// Test scenarios under which CHA-based devirtualization happens,
// and class loading that overrides a method can invalidate compiled code.
public static void main(String[] args) {
System.loadLibrary(args[0]);
sIsOptimizing = isAotCompiled(Main.class, "testOverride");
sHasJIT = hasJit();
// sMain1 is an instance of Main1. Main2 hasn't bee loaded yet.
sMain1 = new Main1();
ensureJitCompiled(Main.class, "testOverride");
if (sHasJIT && !sIsOptimizing) {
assertSingleImplementation(Base.class, "foo", true);
assertSingleImplementation(Main1.class, "foo", true);
} else {
// Main2 is verified ahead-of-time so it's linked in already.
}
// Create another thread that also calls sMain1.foo().
// Try to test suspend and deopt another thread.
new Thread() {
public void run() {
testOverride(false, true);
}
}.start();
// This will create Main2 instance in the middle of testOverride().
testOverride(true, false);
assertSingleImplementation(Base.class, "foo", false);
assertSingleImplementation(Main1.class, "foo", false);
}
private static native boolean hasJit();
private native static boolean isAotCompiled(Class<?> cls, String methodName);
private static native void ensureJitCompiled(Class<?> itf, String method_name);
private static native void assertIsInterpreted();
private static native void assertIsManaged();
private static native boolean isInterpreted();
private static native boolean hasSingleImplementation(Class<?> clazz, String method_name);
}
// Put createMain2() in another class to avoid class loading due to verifier.
class Helper {
static Main1 createMain2() {
return new Main2();
}
}