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