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1 // Copyright 2012 the V8 project authors. All rights reserved. | 1 // Copyright 2012 the V8 project authors. All rights reserved. |
2 // Redistribution and use in source and binary forms, with or without | 2 // Redistribution and use in source and binary forms, with or without |
3 // modification, are permitted provided that the following conditions are | 3 // modification, are permitted provided that the following conditions are |
4 // met: | 4 // met: |
5 // | 5 // |
6 // * Redistributions of source code must retain the above copyright | 6 // * Redistributions of source code must retain the above copyright |
7 // notice, this list of conditions and the following disclaimer. | 7 // notice, this list of conditions and the following disclaimer. |
8 // * Redistributions in binary form must reproduce the above | 8 // * Redistributions in binary form must reproduce the above |
9 // copyright notice, this list of conditions and the following | 9 // copyright notice, this list of conditions and the following |
10 // disclaimer in the documentation and/or other materials provided | 10 // disclaimer in the documentation and/or other materials provided |
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212 bool lookup_done_; | 212 bool lookup_done_; |
213 | 213 |
214 // Add a single sample to this histogram. | 214 // Add a single sample to this histogram. |
215 void AddSample(int sample); | 215 void AddSample(int sample); |
216 | 216 |
217 // Returns true if this histogram is enabled. | 217 // Returns true if this histogram is enabled. |
218 bool Enabled() { | 218 bool Enabled() { |
219 return GetHistogram() != NULL; | 219 return GetHistogram() != NULL; |
220 } | 220 } |
221 | 221 |
| 222 // Reset the cached internal pointer. |
| 223 void Reset() { |
| 224 lookup_done_ = false; |
| 225 } |
| 226 |
222 protected: | 227 protected: |
223 // Returns the handle to the histogram. | 228 // Returns the handle to the histogram. |
224 void* GetHistogram() { | 229 void* GetHistogram() { |
225 if (!lookup_done_) { | 230 if (!lookup_done_) { |
226 lookup_done_ = true; | 231 lookup_done_ = true; |
227 histogram_ = CreateHistogram(); | 232 histogram_ = CreateHistogram(); |
228 } | 233 } |
229 return histogram_; | 234 return histogram_; |
230 } | 235 } |
231 | 236 |
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244 // Start the timer. | 249 // Start the timer. |
245 void Start(); | 250 void Start(); |
246 | 251 |
247 // Stop the timer and record the results. | 252 // Stop the timer and record the results. |
248 void Stop(); | 253 void Stop(); |
249 | 254 |
250 // Returns true if the timer is running. | 255 // Returns true if the timer is running. |
251 bool Running() { | 256 bool Running() { |
252 return histogram_.Enabled() && (start_time_ != 0) && (stop_time_ == 0); | 257 return histogram_.Enabled() && (start_time_ != 0) && (stop_time_ == 0); |
253 } | 258 } |
| 259 |
| 260 void Reset() { |
| 261 histogram_.Reset(); |
| 262 } |
254 }; | 263 }; |
255 | 264 |
256 // Helper class for scoping a HistogramTimer. | 265 // Helper class for scoping a HistogramTimer. |
257 class HistogramTimerScope BASE_EMBEDDED { | 266 class HistogramTimerScope BASE_EMBEDDED { |
258 public: | 267 public: |
259 explicit HistogramTimerScope(HistogramTimer* timer) : | 268 explicit HistogramTimerScope(HistogramTimer* timer) : |
260 timer_(timer) { | 269 timer_(timer) { |
261 timer_->Start(); | 270 timer_->Start(); |
262 } | 271 } |
263 ~HistogramTimerScope() { | 272 ~HistogramTimerScope() { |
264 timer_->Stop(); | 273 timer_->Stop(); |
265 } | 274 } |
266 private: | 275 private: |
267 HistogramTimer* timer_; | 276 HistogramTimer* timer_; |
268 }; | 277 }; |
269 | 278 |
270 | 279 |
271 } } // namespace v8::internal | 280 } } // namespace v8::internal |
272 | 281 |
273 #endif // V8_COUNTERS_H_ | 282 #endif // V8_COUNTERS_H_ |
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