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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_