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/* Copyright (C) 2019 The Android Open Source Project
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This file implements interfaces from the file jvmti.h. This implementation
* is licensed under the same terms as the file jvmti.h. The
* copyright and license information for the file jvmti.h follows.
*
* Copyright (c) 2003, 2011, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
#ifndef ART_OPENJDKJVMTI_ALLOC_MANAGER_H_
#define ART_OPENJDKJVMTI_ALLOC_MANAGER_H_
#include <jvmti.h>
#include <atomic>
#include "base/locks.h"
#include "base/mutex.h"
#include "gc/allocation_listener.h"
namespace art {
template <typename T> class MutableHandle;
template <typename T> class ObjPtr;
class Thread;
namespace mirror {
class Class;
class Object;
} // namespace mirror
} // namespace art
namespace openjdkjvmti {
class AllocationManager;
class JvmtiAllocationListener : public art::gc::AllocationListener {
public:
explicit JvmtiAllocationListener(AllocationManager* manager) : manager_(manager) {}
void ObjectAllocated(art::Thread* self,
art::ObjPtr<art::mirror::Object>* obj,
size_t cnt) override REQUIRES_SHARED(art::Locks::mutator_lock_);
bool HasPreAlloc() const override REQUIRES_SHARED(art::Locks::mutator_lock_);
void PreObjectAllocated(art::Thread* self,
art::MutableHandle<art::mirror::Class> type,
size_t* byte_count) override REQUIRES_SHARED(art::Locks::mutator_lock_);
private:
AllocationManager* manager_;
};
class AllocationManager {
public:
class AllocationCallback {
public:
virtual ~AllocationCallback() {}
virtual void ObjectAllocated(art::Thread* self,
art::ObjPtr<art::mirror::Object>* obj,
size_t byte_count) REQUIRES_SHARED(art::Locks::mutator_lock_) = 0;
};
AllocationManager();
void SetAllocListener(AllocationCallback* callback);
void RemoveAllocListener();
static AllocationManager* Get();
void PauseAllocations(art::Thread* self) REQUIRES_SHARED(art::Locks::mutator_lock_);
void ResumeAllocations(art::Thread* self) REQUIRES_SHARED(art::Locks::mutator_lock_);
void EnableAllocationCallback(art::Thread* self) REQUIRES_SHARED(art::Locks::mutator_lock_);
void DisableAllocationCallback(art::Thread* self) REQUIRES_SHARED(art::Locks::mutator_lock_);
private:
template<typename T>
void PauseForAllocation(art::Thread* self, T msg) REQUIRES_SHARED(art::Locks::mutator_lock_);
void IncrListenerInstall(art::Thread* self) REQUIRES_SHARED(art::Locks::mutator_lock_);
void DecrListenerInstall(art::Thread* self) REQUIRES_SHARED(art::Locks::mutator_lock_);
AllocationCallback* callback_ = nullptr;
uint32_t listener_refcount_ GUARDED_BY(alloc_listener_mutex_) = 0;
std::atomic<bool> allocations_paused_ever_ = false;
std::atomic<art::Thread*> allocations_paused_thread_ = nullptr;
std::atomic<bool> callback_enabled_ = false;
std::unique_ptr<JvmtiAllocationListener> alloc_listener_ = nullptr;
art::Mutex alloc_listener_mutex_ ACQUIRED_AFTER(art::Locks::user_code_suspension_lock_);
art::ConditionVariable alloc_pause_cv_;
friend class JvmtiAllocationListener;
};
} // namespace openjdkjvmti
#endif // ART_OPENJDKJVMTI_ALLOC_MANAGER_H_
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