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 MostDerived extends Derived { 18 public static void test(Class main) { 19 // The defining class loader of MostDerived (MDCL) is also the initiating loader of 20 // superclass Derived but delegates the loading to its parent class loader (PCL) which 21 // defines both Derived and Base. Thus Derived.class is recorded in MDCL's ClassTable 22 // but the Base.class is not because the Base's initiating loader is PCL. This is the 23 // case when loading the MostDerived class and remains the case after resolving the 24 // "invoke-super Derived.foo(.)" called from from MostDerived.foo(.). When that 25 // invoke-super is executed from AOT-compiled code, it goes through the .bss ArtMethod* 26 // entry and on first execution goes through the resolution method. After resolving to 27 // the Base.foo(.), the artQuickResolutionTrampoline() used to erroneously fill the 28 // Base.foo(.) entry in the MostDerived's DexCache which is wrong as the referenced 29 // class Base is not in the associated, i.e. MDCL's, ClassTable. 30 new MostDerived().foo(main); 31 try { 32 // This discrepancy then used to crash when resolving the Base.foo(.) method 33 // for JIT compilation of another method. 34 main.getDeclaredMethod("ensureJitCompiled", Class.class, String.class).invoke( 35 null, MostDerived.class, "bar"); 36 } catch (Throwable t) { 37 t.printStackTrace(System.out); 38 } 39 System.out.println("MostDerived.test(.) done."); 40 } 41 42 public void foo(Class main) { 43 super.foo(main); 44 } 45 46 public void bar(Class main) { 47 Base b = this; 48 b.foo(main); 49 } 50 } 51
