| // Copyright (c) 2013, the Dart project authors. Please see the AUTHORS file |
| // for details. All rights reserved. Use of this source code is governed by a |
| // BSD-style license that can be found in the LICENSE file. |
| |
| #ifndef VM_TRACE_BUFFER_H_ |
| #define VM_TRACE_BUFFER_H_ |
| |
| #include "platform/assert.h" |
| #include "platform/globals.h" |
| #include "vm/json_stream.h" |
| |
| namespace dart { |
| |
| class JSONStream; |
| |
| struct TraceBufferEntry { |
| int64_t micros; |
| char* message; |
| bool empty() const { |
| return message == NULL; |
| } |
| }; |
| |
| class TraceBuffer { |
| public: |
| static const intptr_t kDefaultCapacity = 1024; |
| |
| explicit TraceBuffer(intptr_t capacity = kDefaultCapacity); |
| ~TraceBuffer(); |
| |
| void Clear(); |
| |
| // Internally message is copied. |
| void Trace(int64_t micros, const char* message); |
| // Internally message is copied. |
| void Trace(const char* message); |
| void TraceF(const char* format, ...) PRINTF_ATTRIBUTE(2, 3); |
| |
| void PrintToJSONStream(JSONStream* stream) const; |
| |
| private: |
| void Init(); |
| void Cleanup(); |
| void Fill(TraceBufferEntry* entry, int64_t micros, char* msg); |
| void AppendTrace(int64_t micros, char* message); |
| |
| TraceBufferEntry* ring_; |
| const intptr_t ring_capacity_; |
| intptr_t ring_cursor_; |
| |
| intptr_t RingIndex(intptr_t i) const { |
| return i % ring_capacity_; |
| } |
| |
| DISALLOW_COPY_AND_ASSIGN(TraceBuffer); |
| }; |
| |
| |
| } // namespace dart |
| |
| #endif // VM_TRACE_BUFFER_H_ |