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| 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 | |
| 3 // found in the LICENSE file. | |
| 4 | |
| 5 #ifndef V8_SAMPLER_H_ | |
| 6 #define V8_SAMPLER_H_ | |
| 7 | |
| 8 #include "include/v8.h" | |
| 9 | |
| 10 #include "src/base/atomicops.h" | |
| 11 #include "src/base/platform/time.h" | |
| 12 #include "src/frames.h" | |
| 13 #include "src/globals.h" | |
| 14 | |
| 15 namespace v8 { | |
| 16 namespace internal { | |
| 17 | |
| 18 class Isolate; | |
| 19 | |
| 20 // ---------------------------------------------------------------------------- | |
| 21 // Sampler | |
| 22 // | |
| 23 // A sampler periodically samples the state of the VM and optionally | |
| 24 // (if used for profiling) the program counter and stack pointer for | |
| 25 // the thread that created it. | |
| 26 | |
| 27 // TickSample captures the information collected for each sample. | |
| 28 struct TickSample { | |
| 29 // Internal profiling (with --prof + tools/$OS-tick-processor) wants to | |
| 30 // include the runtime function we're calling. Externally exposed tick | |
| 31 // samples don't care. | |
| 32 enum RecordCEntryFrame { kIncludeCEntryFrame, kSkipCEntryFrame }; | |
| 33 | |
| 34 TickSample() | |
| 35 : state(OTHER), | |
| 36 pc(NULL), | |
| 37 external_callback(NULL), | |
| 38 frames_count(0), | |
| 39 has_external_callback(false), | |
| 40 top_frame_type(StackFrame::NONE) {} | |
| 41 void Init(Isolate* isolate, const v8::RegisterState& state, | |
| 42 RecordCEntryFrame record_c_entry_frame); | |
| 43 static void GetStackSample(Isolate* isolate, const v8::RegisterState& state, | |
| 44 RecordCEntryFrame record_c_entry_frame, | |
| 45 void** frames, size_t frames_limit, | |
| 46 v8::SampleInfo* sample_info); | |
| 47 StateTag state; // The state of the VM. | |
| 48 Address pc; // Instruction pointer. | |
| 49 union { | |
| 50 Address tos; // Top stack value (*sp). | |
| 51 Address external_callback; | |
| 52 }; | |
| 53 static const unsigned kMaxFramesCountLog2 = 8; | |
| 54 static const unsigned kMaxFramesCount = (1 << kMaxFramesCountLog2) - 1; | |
| 55 Address stack[kMaxFramesCount]; // Call stack. | |
| 56 base::TimeTicks timestamp; | |
| 57 unsigned frames_count : kMaxFramesCountLog2; // Number of captured frames. | |
| 58 bool has_external_callback : 1; | |
| 59 StackFrame::Type top_frame_type : 4; | |
| 60 }; | |
| 61 | |
| 62 class Sampler { | |
| 63 public: | |
| 64 // Initializes the Sampler support. Called once at VM startup. | |
| 65 static void SetUp(); | |
| 66 static void TearDown(); | |
| 67 | |
| 68 // Initialize sampler. | |
| 69 Sampler(Isolate* isolate, int interval); | |
| 70 virtual ~Sampler(); | |
| 71 | |
| 72 Isolate* isolate() const { return isolate_; } | |
| 73 int interval() const { return interval_; } | |
| 74 | |
| 75 // Performs stack sampling. | |
| 76 void SampleStack(const v8::RegisterState& regs); | |
| 77 | |
| 78 // Start and stop sampler. | |
| 79 void Start(); | |
| 80 void Stop(); | |
| 81 | |
| 82 // Whether the sampling thread should use this Sampler for CPU profiling? | |
| 83 bool IsProfiling() const { | |
| 84 return base::NoBarrier_Load(&profiling_) > 0 && | |
| 85 !base::NoBarrier_Load(&has_processing_thread_); | |
| 86 } | |
| 87 void IncreaseProfilingDepth(); | |
| 88 void DecreaseProfilingDepth(); | |
| 89 | |
| 90 // Whether the sampler is running (that is, consumes resources). | |
| 91 bool IsActive() const { return base::NoBarrier_Load(&active_); } | |
| 92 | |
| 93 void DoSample(); | |
| 94 // If true next sample must be initiated on the profiler event processor | |
| 95 // thread right after latest sample is processed. | |
| 96 void SetHasProcessingThread(bool value) { | |
| 97 base::NoBarrier_Store(&has_processing_thread_, value); | |
| 98 } | |
| 99 | |
| 100 // Used in tests to make sure that stack sampling is performed. | |
| 101 unsigned js_and_external_sample_count() const { | |
| 102 return js_and_external_sample_count_; | |
| 103 } | |
| 104 void StartCountingSamples() { | |
| 105 is_counting_samples_ = true; | |
| 106 js_and_external_sample_count_ = 0; | |
| 107 } | |
| 108 | |
| 109 class PlatformData; | |
| 110 PlatformData* platform_data() const { return data_; } | |
| 111 | |
| 112 protected: | |
| 113 // This method is called for each sampling period with the current | |
| 114 // program counter. | |
| 115 virtual void Tick(TickSample* sample) = 0; | |
| 116 | |
| 117 private: | |
| 118 void SetActive(bool value) { base::NoBarrier_Store(&active_, value); } | |
| 119 | |
| 120 Isolate* isolate_; | |
| 121 const int interval_; | |
| 122 base::Atomic32 profiling_; | |
| 123 base::Atomic32 has_processing_thread_; | |
| 124 base::Atomic32 active_; | |
| 125 PlatformData* data_; // Platform specific data. | |
| 126 bool is_counting_samples_; | |
| 127 // Counts stack samples taken in JS VM state. | |
| 128 unsigned js_and_external_sample_count_; | |
| 129 DISALLOW_IMPLICIT_CONSTRUCTORS(Sampler); | |
| 130 }; | |
| 131 | |
| 132 | |
| 133 } } // namespace v8::internal | |
| 134 | |
| 135 #endif // V8_SAMPLER_H_ | |
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Chromium Code Reviews
Issue 1356223004:
Move heap and CPU profilers into a dedicated directory. (Closed)
Base URL: https://chromium.googlesource.com/v8/v8.git@master