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/*
* Copyright (C) 2016 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.
*/
#ifndef ART_RUNTIME_GC_ALLOCATION_LISTENER_H_
#define ART_RUNTIME_GC_ALLOCATION_LISTENER_H_
#include <list>
#include <memory>
#include "base/locks.h"
#include "base/macros.h"
#include "gc_root.h"
#include "handle.h"
#include "obj_ptr.h"
namespace art {
namespace mirror {
class Class;
class Object;
} // namespace mirror
class Thread;
namespace gc {
class AllocationListener {
public:
virtual ~AllocationListener() {}
// An event to allow a listener to intercept and modify an allocation before it takes place.
// The listener can change the byte_count and type as they see fit. Extreme caution should be used
// when doing so. This can also be used to control allocation occurring on another thread.
//
// Concurrency guarantees: This might be called multiple times for each single allocation. It's
// guaranteed that, between the final call to the callback and the object being visible to
// heap-walks there are no suspensions. If a suspension was allowed between these events the
// callback will be invoked again after passing the suspend point.
//
// If the alloc succeeds it is guaranteed there are no suspend-points between the last return of
// PreObjectAlloc and the newly allocated object being visible to heap-walks.
//
// This can also be used to make any last-minute changes to the type or size of the allocation.
virtual void PreObjectAllocated(Thread* self ATTRIBUTE_UNUSED,
MutableHandle<mirror::Class> type ATTRIBUTE_UNUSED,
size_t* byte_count ATTRIBUTE_UNUSED)
REQUIRES(!Roles::uninterruptible_) REQUIRES_SHARED(Locks::mutator_lock_) {}
// Fast check if we want to get the PreObjectAllocated callback, to avoid the expense of creating
// handles. Defaults to false.
virtual bool HasPreAlloc() const { return false; }
virtual void ObjectAllocated(Thread* self, ObjPtr<mirror::Object>* obj, size_t byte_count)
REQUIRES_SHARED(Locks::mutator_lock_) = 0;
};
} // namespace gc
} // namespace art
#endif // ART_RUNTIME_GC_ALLOCATION_LISTENER_H_
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