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/*
* Copyright (C) 2012 Google Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef THIRD_PARTY_BLINK_RENDERER_PLATFORM_INSTRUMENTATION_INSTANCE_COUNTERS_H_
#define THIRD_PARTY_BLINK_RENDERER_PLATFORM_INSTRUMENTATION_INSTANCE_COUNTERS_H_
#include <array>
#include <atomic>
#include "third_party/blink/renderer/platform/platform_export.h"
#include "third_party/blink/renderer/platform/wtf/allocator/allocator.h"
#include "third_party/blink/renderer/platform/wtf/wtf.h"
namespace blink {
#define INSTANCE_COUNTERS_LIST(V) \
V(AudioHandler) \
V(AudioWorkletProcessor) \
V(Document) \
V(Frame) \
V(JSEventListener) \
V(LayoutObject) \
V(MediaKeySession) \
V(MediaKeys) \
V(Node) \
V(Resource) \
V(ContextLifecycleStateObserver) \
V(V8PerContextData) \
V(WorkerGlobalScope) \
V(UACSSResource) \
V(RTCPeerConnection) \
V(ResourceFetcher) \
V(AdSubframe) \
V(DetachedScriptState) \
V(ArrayBufferContents)
// Atomic counters of the number of instances of objects that exist.
//
// Note that while these operations are atomic, they do not imply that other
// changes to memory are visible to the accessing thread. As a result, this
// is primarily useful where either other synchronization exists (e.g. the
// objects are only used on one thread), or an inconsistent answer is
// acceptable.
class InstanceCounters {
STATIC_ONLY(InstanceCounters);
public:
enum CounterType {
#define DECLARE_INSTANCE_COUNTER(name) k##name##Counter,
INSTANCE_COUNTERS_LIST(DECLARE_INSTANCE_COUNTER)
#undef DECLARE_INSTANCE_COUNTER
kCounterTypeLength
};
static inline void IncrementCounter(CounterType type) {
// There are lots of nodes created. Atomic barriers or locks
// should be avoided for the sake of performance. See crbug.com/641019
if (type == kNodeCounter) {
DCHECK(IsMainThread());
++node_counter_;
} else {
counters_[type].fetch_add(1, std::memory_order_relaxed);
}
}
static inline void DecrementCounter(CounterType type) {
if (type == kNodeCounter) {
DCHECK(IsMainThread());
--node_counter_;
} else {
counters_[type].fetch_sub(1, std::memory_order_relaxed);
}
}
PLATFORM_EXPORT static int CounterValue(CounterType);
private:
PLATFORM_EXPORT static std::array<std::atomic_int, kCounterTypeLength>
counters_;
PLATFORM_EXPORT static int node_counter_;
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_PLATFORM_INSTRUMENTATION_INSTANCE_COUNTERS_H_
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