com.google.inject.internal.aop.UnsafeGetter Maven / Gradle / Ivy
/*
* Copyright (C) 2023 Google Inc.
*
* 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.
*/
package com.google.inject.internal.aop;
final class UnsafeGetter {
private UnsafeGetter() {}
static sun.misc.Unsafe getUnsafe() throws ReflectiveOperationException {
try {
return sun.misc.Unsafe.getUnsafe();
} catch (SecurityException unusedFallbackToReflection) {
}
// Note that we do not do this in a privileged action because we expect we're already in a
// privileged block (from UnsafeClassDefiner).
Class k = sun.misc.Unsafe.class;
for (java.lang.reflect.Field f : k.getDeclaredFields()) {
f.setAccessible(true);
Object x = f.get(null);
if (k.isInstance(x)) {
return k.cast(x);
}
}
throw new NoSuchFieldError("the Unsafe");
}
}