content: /*
   * Copyright (C) 2016 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.
   */
  
  import java.lang.reflect.InvocationHandler;
  import java.lang.reflect.Method;
  import java.lang.reflect.Proxy;
  
  class Main1 {
    void foo(int i) {
      if (i != 1) {
        printError("error1");
      }
    }
  
    void printError(String msg) {
      System.out.println(msg);
    }
  }
  
  class Main2 extends Main1 {
    void foo(int i) {
      if (i != 2) {
        printError("error2");
      }
    }
  }
  
  class Proxied implements Runnable {
    public void run() {
      synchronized(Main.class) {
        Main.sOtherThreadStarted = true;
        // Wait for Main2 to be linked and deoptimization is triggered.
        try {
          Main.class.wait();
        } catch (Exception e) {
        }
      }
    }
  }
  
  class MyInvocationHandler implements InvocationHandler {
    private final Proxied proxied;
  
    public MyInvocationHandler(Proxied proxied) {
      this.proxied = proxied;
    }
  
    public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
      return method.invoke(proxied, args);
    }
  }
  
  public class Main {
    static Main1 sMain1;
    static Main1 sMain2;
    static volatile boolean sOtherThreadStarted;
  
    // 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 Dummy.createMain2() which links in Main2, live testOverride() on stack
    // should be deoptimized.
    static void testOverride() {
      sMain1.foo(sMain1.getClass() == Main1.class ? 1 : 2);
  
      // Wait for the other thread to start.
      while (!sOtherThreadStarted);
      // Create an Main2 instance and assign it to sMain2.
      // sMain1 is kept the same.
      sMain2 = Dummy.createMain2();
      // Wake up the other thread.
      synchronized(Main.class) {
        Main.class.notify();
      }
  
      // There should be a deoptimization here right after Main2 is linked by
      // calling Dummy.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 (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.
    // Also create a proxy method such that a proxy method's frame is visited
    // during stack walking.
    public static void main(String[] args) {
      System.loadLibrary(args[0]);
      // sMain1 is an instance of Main1. Main2 hasn't bee loaded yet.
      sMain1 = new Main1();
  
      // Create another thread that calls a proxy method.
      new Thread() {
        public void run() {
          Runnable proxy = (Runnable)Proxy.newProxyInstance(
              Proxied.class.getClassLoader(),
              new Class[] { Runnable.class },
              new MyInvocationHandler(new Proxied()));
          proxy.run();
        }
      }.start();
  
      ensureJitCompiled(Main.class, "testOverride");
      // This will create Main2 instance in the middle of testOverride().
      testOverride();
    }
  
    private static native void ensureJitCompiled(Class<?> itf, String method_name);
  }
  
  // Put createMain2() in another class to avoid class loading due to verifier.
  class Dummy {
    static Main1 createMain2() {
      return new Main2();
    }
  }
  