1 /*
2  * Copyright (C) 2018 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 import dalvik.system.ZygoteHooks;
18 
19 public class Main {
main(String[] args)20   public static void main(String[] args) {
21     System.loadLibrary(args[0]);
22     if (!hasJit()) {
23       return;
24     }
25     ensureJitCompiled(Object.class, "toString");
26     ZygoteHooks.preFork();
27     ZygoteHooks.postForkChild(
28         /*flags=*/0, /*is_system_server=*/false, /*is_zygote=*/false, /*instruction_set=*/null);
29     ZygoteHooks.postForkCommon();
30     deoptimizeBootImage();
31     if (hasJitCompiledEntrypoint(Object.class, "toString")) {
32       throw new Error("Expected Object.toString to be deoptimized");
33     }
34   }
35 
hasJit()36   private static native boolean hasJit();
ensureJitCompiled(Class<?> cls, String name)37   private static native void ensureJitCompiled(Class<?> cls, String name);
hasJitCompiledEntrypoint(Class<?> cls, String name)38   private static native boolean hasJitCompiledEntrypoint(Class<?> cls, String name);
deoptimizeBootImage()39   private static native void deoptimizeBootImage();
40 }
41