51 lines
2.3 KiB
Java
51 lines
2.3 KiB
Java
/*
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* Copyright (C) 2017 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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public class MostDerived extends Derived {
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public static void test(Class main) {
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// The defining class loader of MostDerived (MDCL) is also the initiating loader of
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// superclass Derived but delegates the loading to its parent class loader (PCL) which
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// defines both Derived and Base. Thus Derived.class is recorded in MDCL's ClassTable
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// but the Base.class is not because the Base's initiating loader is PCL. This is the
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// case when loading the MostDerived class and remains the case after resolving the
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// "invoke-super Derived.foo(.)" called from from MostDerived.foo(.). When that
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// invoke-super is executed from AOT-compiled code, it goes through the .bss ArtMethod*
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// entry and on first execution goes through the resolution method. After resolving to
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// the Base.foo(.), the artQuickResolutionTrampoline() used to erroneously fill the
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// Base.foo(.) entry in the MostDerived's DexCache which is wrong as the referenced
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// class Base is not in the associated, i.e. MDCL's, ClassTable.
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new MostDerived().foo(main);
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try {
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// This discrepancy then used to crash when resolving the Base.foo(.) method
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// for JIT compilation of another method.
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main.getDeclaredMethod("ensureJitCompiled", Class.class, String.class).invoke(
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null, MostDerived.class, "bar");
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} catch (Throwable t) {
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t.printStackTrace(System.out);
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}
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System.out.println("MostDerived.test(.) done.");
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}
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public void foo(Class main) {
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super.foo(main);
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}
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public void bar(Class main) {
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Base b = this;
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b.foo(main);
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}
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}
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