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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_PROFILER_SAMPLER_H_ | 5 #ifndef V8_PROFILER_TICK_SAMPLE_H_ |
6 #define V8_PROFILER_SAMPLER_H_ | 6 #define V8_PROFILER_TICK_SAMPLE_H_ |
7 | 7 |
8 #include "include/v8.h" | 8 #include "include/v8.h" |
9 | 9 |
10 #include "src/base/atomicops.h" | |
11 #include "src/base/platform/time.h" | 10 #include "src/base/platform/time.h" |
12 #include "src/frames.h" | 11 #include "src/frames.h" |
13 #include "src/globals.h" | 12 #include "src/globals.h" |
14 | 13 |
15 namespace v8 { | 14 namespace v8 { |
16 namespace internal { | 15 namespace internal { |
17 | 16 |
18 class Isolate; | 17 class Isolate; |
19 | 18 |
20 // ---------------------------------------------------------------------------- | 19 // ---------------------------------------------------------------------------- |
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54 static const unsigned kMaxFramesCountLog2 = 8; | 53 static const unsigned kMaxFramesCountLog2 = 8; |
55 static const unsigned kMaxFramesCount = (1 << kMaxFramesCountLog2) - 1; | 54 static const unsigned kMaxFramesCount = (1 << kMaxFramesCountLog2) - 1; |
56 Address stack[kMaxFramesCount]; // Call stack. | 55 Address stack[kMaxFramesCount]; // Call stack. |
57 base::TimeTicks timestamp; | 56 base::TimeTicks timestamp; |
58 unsigned frames_count : kMaxFramesCountLog2; // Number of captured frames. | 57 unsigned frames_count : kMaxFramesCountLog2; // Number of captured frames. |
59 bool has_external_callback : 1; | 58 bool has_external_callback : 1; |
60 bool update_stats : 1; // Whether the sample should update aggregated stats. | 59 bool update_stats : 1; // Whether the sample should update aggregated stats. |
61 StackFrame::Type top_frame_type : 5; | 60 StackFrame::Type top_frame_type : 5; |
62 }; | 61 }; |
63 | 62 |
64 class Sampler { | |
65 public: | |
66 // Initializes the Sampler support. Called once at VM startup. | |
67 static void SetUp(); | |
68 static void TearDown(); | |
69 | |
70 // Initialize sampler. | |
71 Sampler(Isolate* isolate, int interval); | |
72 virtual ~Sampler(); | |
73 | |
74 Isolate* isolate() const { return isolate_; } | |
75 int interval() const { return interval_; } | |
76 | |
77 // Performs stack sampling. | |
78 void SampleStack(const v8::RegisterState& regs); | |
79 | |
80 // Start and stop sampler. | |
81 void Start(); | |
82 void Stop(); | |
83 | |
84 // Whether the sampling thread should use this Sampler for CPU profiling? | |
85 bool IsProfiling() const { | |
86 return base::NoBarrier_Load(&profiling_) > 0 && | |
87 !base::NoBarrier_Load(&has_processing_thread_); | |
88 } | |
89 void IncreaseProfilingDepth(); | |
90 void DecreaseProfilingDepth(); | |
91 | |
92 // Whether the sampler is running (that is, consumes resources). | |
93 bool IsActive() const { return base::NoBarrier_Load(&active_); } | |
94 | |
95 // CpuProfiler collects samples by calling DoSample directly | |
96 // without calling Start. To keep it working, we register the sampler | |
97 // with the CpuProfiler. | |
98 bool IsRegistered() const { return base::NoBarrier_Load(®istered_); } | |
99 | |
100 void DoSample(); | |
101 // If true next sample must be initiated on the profiler event processor | |
102 // thread right after latest sample is processed. | |
103 void SetHasProcessingThread(bool value) { | |
104 base::NoBarrier_Store(&has_processing_thread_, value); | |
105 } | |
106 | |
107 // Used in tests to make sure that stack sampling is performed. | |
108 unsigned js_sample_count() const { return js_sample_count_; } | |
109 unsigned external_sample_count() const { return external_sample_count_; } | |
110 void StartCountingSamples() { | |
111 js_sample_count_ = 0; | |
112 external_sample_count_ = 0; | |
113 is_counting_samples_ = true; | |
114 } | |
115 | |
116 class PlatformData; | |
117 PlatformData* platform_data() const { return data_; } | |
118 | |
119 protected: | |
120 // This method is called for each sampling period with the current | |
121 // program counter. | |
122 virtual void Tick(TickSample* sample) = 0; | |
123 | |
124 private: | |
125 void SetActive(bool value) { base::NoBarrier_Store(&active_, value); } | |
126 | |
127 void SetRegistered(bool value) { base::NoBarrier_Store(®istered_, value); } | |
128 | |
129 Isolate* isolate_; | |
130 const int interval_; | |
131 base::Atomic32 profiling_; | |
132 base::Atomic32 has_processing_thread_; | |
133 base::Atomic32 active_; | |
134 base::Atomic32 registered_; | |
135 PlatformData* data_; // Platform specific data. | |
136 // Counts stack samples taken in various VM states. | |
137 bool is_counting_samples_; | |
138 unsigned js_sample_count_; | |
139 unsigned external_sample_count_; | |
140 DISALLOW_IMPLICIT_CONSTRUCTORS(Sampler); | |
141 }; | |
142 | |
143 | 63 |
144 #if defined(USE_SIMULATOR) | 64 #if defined(USE_SIMULATOR) |
145 class SimulatorHelper : AllStatic { | 65 class SimulatorHelper { |
146 public: | 66 public: |
147 // Returns true if register values were successfully retrieved | 67 // Returns true if register values were successfully retrieved |
148 // from the simulator, otherwise returns false. | 68 // from the simulator, otherwise returns false. |
149 static bool FillRegisters(Isolate* isolate, v8::RegisterState* state); | 69 static bool FillRegisters(Isolate* isolate, v8::RegisterState* state); |
150 }; | 70 }; |
151 #endif // USE_SIMULATOR | 71 #endif // USE_SIMULATOR |
152 | 72 |
153 | |
154 } // namespace internal | 73 } // namespace internal |
155 } // namespace v8 | 74 } // namespace v8 |
156 | 75 |
157 #endif // V8_PROFILER_SAMPLER_H_ | 76 #endif // V8_PROFILER_TICK_SAMPLE_H_ |
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