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/*
* Copyright (C) 2018 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;
import java.util.ArrayList;
class OOMEHelper {
int nullField;
}
/**
* Test that null field access under an OOME situation works.
*
* The test relies on compile-time verification. This class is compile-time verifiable, so when
* loaded at runtime will not transitively load referenced types eagerly. In that case, our code
* to give descriptive NullPointerExceptions for the field access to the null "instance" of
* OOMEHelper in nullAccess() will be the first attempting to load the class, and, under the
* induced low-memory situation, will throw itself an OutOfMemoryError.
*/
public class OOMEOnNullAccess {
static ArrayList<Object> storage = new ArrayList<>(100000);
public static void main(String[] args) {
// Stop the JIT to be sure nothing is running that could be resolving classes or causing
// verification.
Main.stopJit();
Main.waitForCompilation();
int l = 1024 * 1024;
while (l > 8) {
try {
storage.add(new byte[l]);
} catch (OutOfMemoryError e) {
l = l/2;
}
}
try {
nullAccess(null);
storage.clear();
throw new RuntimeException("Did not receive exception!");
} catch (OutOfMemoryError oome) {
storage.clear();
System.err.println("Received OOME");
} finally {
// Even if it's an unexpected error, clear so that we can print things later.
storage.clear();
}
Main.startJit();
}
public static int nullAccess(OOMEHelper nullInstance) {
// Under AOT, this access is the first one to actually load the OOMEHelper class, so
// we can pretty print the name and such.
return nullInstance.nullField;
}
}