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 java.util.HashMap; 18 19 public class Main { main(String[] args)20 public static void main(String[] args) { 21 System.loadLibrary(args[0]); 22 23 // Jit compile HashMap.hash method, so that instrumentation stubs 24 // will deoptimize it. 25 ensureJitCompiled(HashMap.class, "hash"); 26 27 Main key = new Main(); 28 Integer value = new Integer(10); 29 HashMap<Main, Integer> map = new HashMap<>(); 30 map.put(key, value); 31 Integer res = map.get(key); 32 if (!value.equals(res)) { 33 throw new Error("Expected 10, got " + res); 34 } 35 } 36 hashCode()37 public int hashCode() { 38 // The call stack at this point is: 39 // Main.main 40 // HashMap.put 41 // HashMap.hash 42 // Main.hashCode 43 // 44 // The opcode at HashMap.hash is invoke-virtual-quick which the 45 // instrumentation code did not expect and used to fetch the wrong 46 // method index for it. 47 deoptimizeAll(); 48 return 42; 49 } 50 deoptimizeAll()51 public static native void deoptimizeAll(); ensureJitCompiled(Class<?> cls, String methodName)52 public static native void ensureJitCompiled(Class<?> cls, String methodName); 53 } 54