1 /*
2  * Copyright (C) 2017 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 public class Main {
main(String[] args)18   public static void main(String[] args) {
19     System.loadLibrary(args[0]);
20     loop();
21     ensureJitCompiled(Main.class, "$noinline$doCall");
22     loop();
23   }
24 
loop()25   public static void loop() {
26     Main m = new Main();
27     for (int i = 0; i < 5000; i++) {
28       $noinline$doCall("foo");
29       $noinline$doCall(m);
30     }
31   }
32 
$noinline$doCall(Object foo)33   public static boolean $noinline$doCall(Object foo) {
34     boolean isCompiledAtEntry = !isInterpreted();
35     boolean result = foo.equals(Main.class);
36 
37     // Test that the 'equals' above did not lead to a deoptimization.
38     if (isCompiledAtEntry) {
39       if (isInterpreted()) {
40         throw new Error("Unexpected deoptimization");
41       }
42     }
43     return result;
44   }
45 
isInterpreted()46   public static native boolean isInterpreted();
ensureJitCompiled(Class<?> cls, String methodName)47   public static native void ensureJitCompiled(Class<?> cls, String methodName);
48 }
49