1 // Copyright 2012 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_PROFILER_CPU_PROFILER_H_ 6 #define V8_PROFILER_CPU_PROFILER_H_ 7 8 #include <memory> 9 10 #include "src/allocation.h" 11 #include "src/base/atomic-utils.h" 12 #include "src/base/atomicops.h" 13 #include "src/base/platform/time.h" 14 #include "src/compiler.h" 15 #include "src/isolate.h" 16 #include "src/libsampler/v8-sampler.h" 17 #include "src/locked-queue.h" 18 #include "src/profiler/circular-queue.h" 19 #include "src/profiler/profiler-listener.h" 20 #include "src/profiler/tick-sample.h" 21 22 namespace v8 { 23 namespace internal { 24 25 // Forward declarations. 26 class CodeEntry; 27 class CodeMap; 28 class CpuProfile; 29 class CpuProfilesCollection; 30 class ProfileGenerator; 31 32 #define CODE_EVENTS_TYPE_LIST(V) \ 33 V(CODE_CREATION, CodeCreateEventRecord) \ 34 V(CODE_MOVE, CodeMoveEventRecord) \ 35 V(CODE_DISABLE_OPT, CodeDisableOptEventRecord) \ 36 V(CODE_DEOPT, CodeDeoptEventRecord) \ 37 V(REPORT_BUILTIN, ReportBuiltinEventRecord) 38 39 40 class CodeEventRecord { 41 public: 42 #define DECLARE_TYPE(type, ignore) type, 43 enum Type { 44 NONE = 0, 45 CODE_EVENTS_TYPE_LIST(DECLARE_TYPE) 46 NUMBER_OF_TYPES 47 }; 48 #undef DECLARE_TYPE 49 50 Type type; 51 mutable unsigned order; 52 }; 53 54 55 class CodeCreateEventRecord : public CodeEventRecord { 56 public: 57 Address start; 58 CodeEntry* entry; 59 unsigned size; 60 61 INLINE(void UpdateCodeMap(CodeMap* code_map)); 62 }; 63 64 65 class CodeMoveEventRecord : public CodeEventRecord { 66 public: 67 Address from; 68 Address to; 69 70 INLINE(void UpdateCodeMap(CodeMap* code_map)); 71 }; 72 73 74 class CodeDisableOptEventRecord : public CodeEventRecord { 75 public: 76 Address start; 77 const char* bailout_reason; 78 79 INLINE(void UpdateCodeMap(CodeMap* code_map)); 80 }; 81 82 83 class CodeDeoptEventRecord : public CodeEventRecord { 84 public: 85 Address start; 86 const char* deopt_reason; 87 SourcePosition position; 88 int deopt_id; 89 void* pc; 90 int fp_to_sp_delta; 91 92 INLINE(void UpdateCodeMap(CodeMap* code_map)); 93 }; 94 95 96 class ReportBuiltinEventRecord : public CodeEventRecord { 97 public: 98 Address start; 99 Builtins::Name builtin_id; 100 101 INLINE(void UpdateCodeMap(CodeMap* code_map)); 102 }; 103 104 105 class TickSampleEventRecord { 106 public: 107 // The parameterless constructor is used when we dequeue data from 108 // the ticks buffer. 109 TickSampleEventRecord() { } 110 explicit TickSampleEventRecord(unsigned order) : order(order) { } 111 112 unsigned order; 113 TickSample sample; 114 }; 115 116 117 class CodeEventsContainer { 118 public: 119 explicit CodeEventsContainer( 120 CodeEventRecord::Type type = CodeEventRecord::NONE) { 121 generic.type = type; 122 } 123 union { 124 CodeEventRecord generic; 125 #define DECLARE_CLASS(ignore, type) type type##_; 126 CODE_EVENTS_TYPE_LIST(DECLARE_CLASS) 127 #undef DECLARE_TYPE 128 }; 129 }; 130 131 132 // This class implements both the profile events processor thread and 133 // methods called by event producers: VM and stack sampler threads. 134 class ProfilerEventsProcessor : public base::Thread { 135 public: 136 ProfilerEventsProcessor(ProfileGenerator* generator, 137 sampler::Sampler* sampler, 138 base::TimeDelta period); 139 virtual ~ProfilerEventsProcessor(); 140 141 // Thread control. 142 virtual void Run(); 143 void StopSynchronously(); 144 INLINE(bool running()) { return !!base::NoBarrier_Load(&running_); } 145 void Enqueue(const CodeEventsContainer& event); 146 147 // Puts current stack into tick sample events buffer. 148 void AddCurrentStack(Isolate* isolate, bool update_stats = false); 149 void AddDeoptStack(Isolate* isolate, Address from, int fp_to_sp_delta); 150 151 // Tick sample events are filled directly in the buffer of the circular 152 // queue (because the structure is of fixed width, but usually not all 153 // stack frame entries are filled.) This method returns a pointer to the 154 // next record of the buffer. 155 inline TickSample* StartTickSample(); 156 inline void FinishTickSample(); 157 158 // SamplingCircularQueue has stricter alignment requirements than a normal new 159 // can fulfil, so we need to provide our own new/delete here. 160 void* operator new(size_t size); 161 void operator delete(void* ptr); 162 163 private: 164 // Called from events processing thread (Run() method.) 165 bool ProcessCodeEvent(); 166 167 enum SampleProcessingResult { 168 OneSampleProcessed, 169 FoundSampleForNextCodeEvent, 170 NoSamplesInQueue 171 }; 172 SampleProcessingResult ProcessOneSample(); 173 174 ProfileGenerator* generator_; 175 sampler::Sampler* sampler_; 176 base::Atomic32 running_; 177 const base::TimeDelta period_; // Samples & code events processing period. 178 LockedQueue<CodeEventsContainer> events_buffer_; 179 static const size_t kTickSampleBufferSize = 1 * MB; 180 static const size_t kTickSampleQueueLength = 181 kTickSampleBufferSize / sizeof(TickSampleEventRecord); 182 SamplingCircularQueue<TickSampleEventRecord, 183 kTickSampleQueueLength> ticks_buffer_; 184 LockedQueue<TickSampleEventRecord> ticks_from_vm_buffer_; 185 base::AtomicNumber<unsigned> last_code_event_id_; 186 unsigned last_processed_code_event_id_; 187 }; 188 189 class CpuProfiler : public CodeEventObserver { 190 public: 191 explicit CpuProfiler(Isolate* isolate); 192 193 CpuProfiler(Isolate* isolate, CpuProfilesCollection* profiles, 194 ProfileGenerator* test_generator, 195 ProfilerEventsProcessor* test_processor); 196 197 ~CpuProfiler() override; 198 199 void set_sampling_interval(base::TimeDelta value); 200 void CollectSample(); 201 void StartProfiling(const char* title, bool record_samples = false); 202 void StartProfiling(String* title, bool record_samples); 203 CpuProfile* StopProfiling(const char* title); 204 CpuProfile* StopProfiling(String* title); 205 int GetProfilesCount(); 206 CpuProfile* GetProfile(int index); 207 void DeleteAllProfiles(); 208 void DeleteProfile(CpuProfile* profile); 209 210 void CodeEventHandler(const CodeEventsContainer& evt_rec) override; 211 212 // Invoked from stack sampler (thread or signal handler.) 213 inline TickSample* StartTickSample(); 214 inline void FinishTickSample(); 215 216 bool is_profiling() const { return is_profiling_; } 217 218 ProfileGenerator* generator() const { return generator_.get(); } 219 ProfilerEventsProcessor* processor() const { return processor_.get(); } 220 Isolate* isolate() const { return isolate_; } 221 222 private: 223 void StartProcessorIfNotStarted(); 224 void StopProcessorIfLastProfile(const char* title); 225 void StopProcessor(); 226 void ResetProfiles(); 227 void LogBuiltins(); 228 229 Isolate* const isolate_; 230 base::TimeDelta sampling_interval_; 231 std::unique_ptr<CpuProfilesCollection> profiles_; 232 std::unique_ptr<ProfileGenerator> generator_; 233 std::unique_ptr<ProfilerEventsProcessor> processor_; 234 bool saved_is_logging_; 235 bool is_profiling_; 236 237 DISALLOW_COPY_AND_ASSIGN(CpuProfiler); 238 }; 239 240 } // namespace internal 241 } // namespace v8 242 243 244 #endif // V8_PROFILER_CPU_PROFILER_H_ 245
