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Side by Side Diff: src/base/platform/elapsed-timer.h

Issue 430503007: Rename ASSERT* to DCHECK*. (Closed) Base URL: https://v8.googlecode.com/svn/branches/bleeding_edge
Patch Set: REBASE and fixes Created 6 years, 4 months ago
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1 // Copyright 2013 the V8 project authors. All rights reserved. 1 // Copyright 2013 the V8 project authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be 2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file. 3 // found in the LICENSE file.
4 4
5 #ifndef V8_BASE_PLATFORM_ELAPSED_TIMER_H_ 5 #ifndef V8_BASE_PLATFORM_ELAPSED_TIMER_H_
6 #define V8_BASE_PLATFORM_ELAPSED_TIMER_H_ 6 #define V8_BASE_PLATFORM_ELAPSED_TIMER_H_
7 7
8 #include "src/base/logging.h" 8 #include "src/base/logging.h"
9 #include "src/base/platform/time.h" 9 #include "src/base/platform/time.h"
10 10
11 namespace v8 { 11 namespace v8 {
12 namespace base { 12 namespace base {
13 13
14 class ElapsedTimer V8_FINAL { 14 class ElapsedTimer V8_FINAL {
15 public: 15 public:
16 #ifdef DEBUG 16 #ifdef DEBUG
17 ElapsedTimer() : started_(false) {} 17 ElapsedTimer() : started_(false) {}
18 #endif 18 #endif
19 19
20 // Starts this timer. Once started a timer can be checked with 20 // Starts this timer. Once started a timer can be checked with
21 // |Elapsed()| or |HasExpired()|, and may be restarted using |Restart()|. 21 // |Elapsed()| or |HasExpired()|, and may be restarted using |Restart()|.
22 // This method must not be called on an already started timer. 22 // This method must not be called on an already started timer.
23 void Start() { 23 void Start() {
24 ASSERT(!IsStarted()); 24 DCHECK(!IsStarted());
25 start_ticks_ = Now(); 25 start_ticks_ = Now();
26 #ifdef DEBUG 26 #ifdef DEBUG
27 started_ = true; 27 started_ = true;
28 #endif 28 #endif
29 ASSERT(IsStarted()); 29 DCHECK(IsStarted());
30 } 30 }
31 31
32 // Stops this timer. Must not be called on a timer that was not 32 // Stops this timer. Must not be called on a timer that was not
33 // started before. 33 // started before.
34 void Stop() { 34 void Stop() {
35 ASSERT(IsStarted()); 35 DCHECK(IsStarted());
36 start_ticks_ = TimeTicks(); 36 start_ticks_ = TimeTicks();
37 #ifdef DEBUG 37 #ifdef DEBUG
38 started_ = false; 38 started_ = false;
39 #endif 39 #endif
40 ASSERT(!IsStarted()); 40 DCHECK(!IsStarted());
41 } 41 }
42 42
43 // Returns |true| if this timer was started previously. 43 // Returns |true| if this timer was started previously.
44 bool IsStarted() const { 44 bool IsStarted() const {
45 ASSERT(started_ || start_ticks_.IsNull()); 45 DCHECK(started_ || start_ticks_.IsNull());
46 ASSERT(!started_ || !start_ticks_.IsNull()); 46 DCHECK(!started_ || !start_ticks_.IsNull());
47 return !start_ticks_.IsNull(); 47 return !start_ticks_.IsNull();
48 } 48 }
49 49
50 // Restarts the timer and returns the time elapsed since the previous start. 50 // Restarts the timer and returns the time elapsed since the previous start.
51 // This method is equivalent to obtaining the elapsed time with |Elapsed()| 51 // This method is equivalent to obtaining the elapsed time with |Elapsed()|
52 // and then starting the timer again, but does so in one single operation, 52 // and then starting the timer again, but does so in one single operation,
53 // avoiding the need to obtain the clock value twice. It may only be called 53 // avoiding the need to obtain the clock value twice. It may only be called
54 // on a previously started timer. 54 // on a previously started timer.
55 TimeDelta Restart() { 55 TimeDelta Restart() {
56 ASSERT(IsStarted()); 56 DCHECK(IsStarted());
57 TimeTicks ticks = Now(); 57 TimeTicks ticks = Now();
58 TimeDelta elapsed = ticks - start_ticks_; 58 TimeDelta elapsed = ticks - start_ticks_;
59 ASSERT(elapsed.InMicroseconds() >= 0); 59 DCHECK(elapsed.InMicroseconds() >= 0);
60 start_ticks_ = ticks; 60 start_ticks_ = ticks;
61 ASSERT(IsStarted()); 61 DCHECK(IsStarted());
62 return elapsed; 62 return elapsed;
63 } 63 }
64 64
65 // Returns the time elapsed since the previous start. This method may only 65 // Returns the time elapsed since the previous start. This method may only
66 // be called on a previously started timer. 66 // be called on a previously started timer.
67 TimeDelta Elapsed() const { 67 TimeDelta Elapsed() const {
68 ASSERT(IsStarted()); 68 DCHECK(IsStarted());
69 TimeDelta elapsed = Now() - start_ticks_; 69 TimeDelta elapsed = Now() - start_ticks_;
70 ASSERT(elapsed.InMicroseconds() >= 0); 70 DCHECK(elapsed.InMicroseconds() >= 0);
71 return elapsed; 71 return elapsed;
72 } 72 }
73 73
74 // Returns |true| if the specified |time_delta| has elapsed since the 74 // Returns |true| if the specified |time_delta| has elapsed since the
75 // previous start, or |false| if not. This method may only be called on 75 // previous start, or |false| if not. This method may only be called on
76 // a previously started timer. 76 // a previously started timer.
77 bool HasExpired(TimeDelta time_delta) const { 77 bool HasExpired(TimeDelta time_delta) const {
78 ASSERT(IsStarted()); 78 DCHECK(IsStarted());
79 return Elapsed() >= time_delta; 79 return Elapsed() >= time_delta;
80 } 80 }
81 81
82 private: 82 private:
83 static V8_INLINE TimeTicks Now() { 83 static V8_INLINE TimeTicks Now() {
84 TimeTicks now = TimeTicks::HighResolutionNow(); 84 TimeTicks now = TimeTicks::HighResolutionNow();
85 ASSERT(!now.IsNull()); 85 DCHECK(!now.IsNull());
86 return now; 86 return now;
87 } 87 }
88 88
89 TimeTicks start_ticks_; 89 TimeTicks start_ticks_;
90 #ifdef DEBUG 90 #ifdef DEBUG
91 bool started_; 91 bool started_;
92 #endif 92 #endif
93 }; 93 };
94 94
95 } } // namespace v8::base 95 } } // namespace v8::base
96 96
97 #endif // V8_BASE_PLATFORM_ELAPSED_TIMER_H_ 97 #endif // V8_BASE_PLATFORM_ELAPSED_TIMER_H_
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