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1 // Copyright (c) 2015, the Dart project authors. Please see the AUTHORS file | 1 // Copyright (c) 2015, the Dart project authors. Please see the AUTHORS file |
2 // for details. All rights reserved. Use of this source code is governed by a | 2 // for details. All rights reserved. Use of this source code is governed by a |
3 // BSD-style license that can be found in the LICENSE file. | 3 // BSD-style license that can be found in the LICENSE file. |
4 | 4 |
5 #ifndef VM_SCOPE_TIMER_H_ | 5 #ifndef VM_SCOPE_TIMER_H_ |
6 #define VM_SCOPE_TIMER_H_ | 6 #define VM_SCOPE_TIMER_H_ |
7 | 7 |
8 namespace dart { | 8 namespace dart { |
9 | 9 |
10 // Simple utility class for timing a block of code. | 10 // Simple utility class for timing a block of code. |
11 class ScopeTimer : public ValueObject { | 11 class ScopeTimer : public ValueObject { |
12 public: | 12 public: |
13 explicit ScopeTimer(const char* name, bool enabled = true) | 13 explicit ScopeTimer(const char* name, bool enabled = true) |
14 : enabled_(enabled), | 14 : enabled_(enabled), |
15 name_(name) { | 15 name_(name), |
| 16 start_(0) { |
16 if (!enabled_) { | 17 if (!enabled_) { |
17 return; | 18 return; |
18 } | 19 } |
19 start_ = OS::GetCurrentTimeMicros(); | 20 start_ = OS::GetCurrentTimeMicros(); |
20 } | 21 } |
21 | 22 |
22 int64_t GetElapsed() const { | 23 int64_t GetElapsed() const { |
23 int64_t end = OS::GetCurrentTimeMicros(); | 24 int64_t end = OS::GetCurrentTimeMicros(); |
24 ASSERT(end >= start_); | 25 ASSERT(end >= start_); |
25 return end - start_; | 26 return end - start_; |
26 } | 27 } |
27 | 28 |
28 ~ScopeTimer() { | 29 ~ScopeTimer() { |
29 if (!enabled_) { | 30 if (!enabled_) { |
30 return; | 31 return; |
31 } | 32 } |
32 int64_t elapsed = GetElapsed(); | 33 int64_t elapsed = GetElapsed(); |
33 OS::Print("%s took %" Pd64 " micros.\n", name_, elapsed); | 34 OS::Print("%s took %" Pd64 " micros.\n", name_, elapsed); |
34 } | 35 } |
35 | 36 |
36 private: | 37 private: |
37 const bool enabled_; | 38 const bool enabled_; |
38 const char* name_; | 39 const char* name_; |
39 int64_t start_; | 40 int64_t start_; |
40 }; | 41 }; |
41 | 42 |
42 } // namespace dart | 43 } // namespace dart |
43 | 44 |
44 #endif // VM_SCOPE_TIMER_H_ | 45 #endif // VM_SCOPE_TIMER_H_ |
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