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      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 import libcore.util.EmptyArray;
     18 
     19 public class Main {
     20     public static void main(String[] args) {
     21         try {
     22             // Check if we're running dalvik or RI.
     23             Class<?> class_loader_class = Class.forName("dalvik.system.PathClassLoader");
     24             System.loadLibrary(args[0]);
     25         } catch (ClassNotFoundException e) {
     26             usingRI = true;
     27             // Add expected JNI_OnLoad log line to match expected.txt.
     28             System.out.println("JNI_OnLoad called");
     29         }
     30         try {
     31             // Initialize all classes needed for old java.lang.Void.TYPE initialization.
     32             Runnable.class.getMethod("run", EmptyArray.CLASS).getReturnType();
     33         } catch (Exception e) {
     34             throw new Error(e);
     35         }
     36         // Clear the resolved types of the ojluni dex file to make sure there is no entry
     37         // for "V", i.e. void.
     38         clearResolvedTypes(Integer.class);
     39         // With java.lang.Void being compile-time verified but uninitialized, initialize
     40         // it now. Previously, this would indirectly initialize TYPE with the current,
     41         // i.e. zero-initialized, value of TYPE. The only thing that could prevent the
     42         // series of calls leading to this was a cache hit in Class.getDexCacheType()
     43         // which we have prevented by clearing the cache above.
     44         Class<?> voidClass = void.class;
     45         System.out.println("void.class = " + voidClass);
     46     }
     47 
     48     public static void clearResolvedTypes(Class<?> c) {
     49         if (!usingRI) {
     50             nativeClearResolvedTypes(c);
     51         }
     52     }
     53 
     54     public static native void nativeClearResolvedTypes(Class<?> c);
     55 
     56     static boolean usingRI = false;
     57 }
     58