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// Copyright 2016 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef V8_LIBPLATFORM_TRACING_TRACE_BUFFER_H_
#define V8_LIBPLATFORM_TRACING_TRACE_BUFFER_H_
#include <memory>
#include <vector>
#include "include/libplatform/v8-tracing.h"
#include "src/base/platform/mutex.h"
namespace v8 {
namespace platform {
namespace tracing {
class TraceBufferRingBuffer : public TraceBuffer {
public:
// Takes ownership of |trace_writer|.
TraceBufferRingBuffer(size_t max_chunks, TraceWriter* trace_writer);
~TraceBufferRingBuffer() override = default;
TraceObject* AddTraceEvent(uint64_t* handle) override;
TraceObject* GetEventByHandle(uint64_t handle) override;
bool Flush() override;
private:
uint64_t MakeHandle(size_t chunk_index, uint32_t chunk_seq,
size_t event_index) const;
void ExtractHandle(uint64_t handle, size_t* chunk_index, uint32_t* chunk_seq,
size_t* event_index) const;
size_t Capacity() const { return max_chunks_ * TraceBufferChunk::kChunkSize; }
size_t NextChunkIndex(size_t index) const;
mutable base::Mutex mutex_;
size_t max_chunks_;
std::unique_ptr<TraceWriter> trace_writer_;
std::vector<std::unique_ptr<TraceBufferChunk>> chunks_;
size_t chunk_index_;
bool is_empty_ = true;
uint32_t current_chunk_seq_ = 1;
};
} // namespace tracing
} // namespace platform
} // namespace v8
#endif // V8_LIBPLATFORM_TRACING_TRACE_BUFFER_H_