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1 // Copyright 2016 the V8 project authors. All rights reserved. | |
2 // Use of this source code is governed by a BSD-style license that can be | |
3 // found in the LICENSE file. | |
4 | |
5 #ifndef SRC_LIBPLATFORM_TRACING_TRACE_BUFFER_H_ | |
6 #define SRC_LIBPLATFORM_TRACING_TRACE_BUFFER_H_ | |
7 | |
8 #include <memory> | |
9 #include <vector> | |
10 | |
11 #include "include/libplatform/v8-tracing.h" | |
12 #include "src/base/platform/mutex.h" | |
13 | |
14 namespace v8 { | |
15 namespace platform { | |
16 namespace tracing { | |
17 | |
18 class TraceBufferRingBuffer : public TraceBuffer { | |
19 public: | |
20 TraceBufferRingBuffer(size_t max_chunks, TraceWriter* trace_writer); | |
21 ~TraceBufferRingBuffer(); | |
22 | |
23 TraceObject* AddTraceEvent(uint64_t* handle) override; | |
24 TraceObject* GetEventByHandle(uint64_t handle) override; | |
25 bool Flush() override; | |
26 | |
27 private: | |
28 uint64_t MakeHandle(size_t chunk_index, uint32_t chunk_seq, | |
29 size_t event_index) const; | |
30 void ExtractHandle(uint64_t handle, size_t* chunk_index, uint32_t* chunk_seq, | |
31 size_t* event_index) const; | |
32 size_t Capacity() const { return max_chunks_ * TraceBufferChunk::kChunkSize; } | |
33 size_t NextChunkIndex(size_t index) const; | |
34 | |
35 mutable base::Mutex mutex_; | |
36 size_t max_chunks_; | |
37 std::unique_ptr<TraceWriter> trace_writer_; | |
38 std::vector<std::unique_ptr<TraceBufferChunk>> chunks_; | |
39 size_t chunk_index_; | |
40 bool is_empty_ = true; | |
41 uint32_t current_chunk_seq_ = 1; | |
42 }; | |
43 | |
44 } // namespace tracing | |
45 } // namespace platform | |
46 } // namespace v8 | |
47 | |
48 #endif // SRC_LIBPLATFORM_TRACING_TRACE_BUFFER_H_ | |
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