1/*
2 * Copyright (C) 2016 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
17import java.lang.reflect.Method;
18
19public class Main {
20  public static void main(String[] args) {
21    System.loadLibrary(args[0]);
22
23    // Get all methods. We cannot call getDeclaredMethod("foo") as
24    // that would make "foo" a strong root.
25    Method[] methods = Main.class.getDeclaredMethods();
26
27    // Call getName on the methods, which is implemented by using the dex
28    // cache and  calling setResolvedString.
29    for (int i = 0; i < methods.length; i++) {
30      methods[i].getName();
31    }
32
33    // Compile Main.foo. "foo" needs to be a strong root for JIT compilation.
34    // We stress test this:
35    //   - avoid strongly interning "foo" by doing "f" + "oo"
36    //   - call GC so that weaks can be collected.
37    //   - invoke foo() to make sure "foo" hasn't been collected.
38    ensureJitCompiled(Main.class, "f" + "oo");
39    Runtime.getRuntime().gc();
40    foo();
41  }
42
43  public static void foo() {
44    System.out.println("foo");
45  }
46
47  public static native void ensureJitCompiled(Class cls, String method_name);
48}
49