// Copyright 2012 the V8 project authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef V8_PROFILER_CPU_PROFILER_H_
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#define V8_PROFILER_CPU_PROFILER_H_
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#include <memory>
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#include "src/allocation.h"
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#include "src/base/atomic-utils.h"
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#include "src/base/atomicops.h"
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#include "src/base/platform/time.h"
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#include "src/isolate.h"
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#include "src/libsampler/sampler.h"
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#include "src/locked-queue.h"
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#include "src/profiler/circular-queue.h"
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#include "src/profiler/profiler-listener.h"
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#include "src/profiler/tick-sample.h"
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namespace v8 {
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namespace internal {
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// Forward declarations.
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class CodeEntry;
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class CodeMap;
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class CpuProfile;
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class CpuProfilesCollection;
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class ProfileGenerator;
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#define CODE_EVENTS_TYPE_LIST(V) \
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V(CODE_CREATION, CodeCreateEventRecord) \
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V(CODE_MOVE, CodeMoveEventRecord) \
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V(CODE_DISABLE_OPT, CodeDisableOptEventRecord) \
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V(CODE_DEOPT, CodeDeoptEventRecord) \
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V(REPORT_BUILTIN, ReportBuiltinEventRecord)
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class CodeEventRecord {
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public:
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#define DECLARE_TYPE(type, ignore) type,
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enum Type {
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NONE = 0,
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CODE_EVENTS_TYPE_LIST(DECLARE_TYPE)
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NUMBER_OF_TYPES
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};
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#undef DECLARE_TYPE
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Type type;
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mutable unsigned order;
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};
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class CodeCreateEventRecord : public CodeEventRecord {
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public:
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Address instruction_start;
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CodeEntry* entry;
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unsigned instruction_size;
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V8_INLINE void UpdateCodeMap(CodeMap* code_map);
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};
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class CodeMoveEventRecord : public CodeEventRecord {
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public:
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Address from_instruction_start;
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Address to_instruction_start;
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V8_INLINE void UpdateCodeMap(CodeMap* code_map);
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};
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class CodeDisableOptEventRecord : public CodeEventRecord {
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public:
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Address instruction_start;
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const char* bailout_reason;
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V8_INLINE void UpdateCodeMap(CodeMap* code_map);
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};
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class CodeDeoptEventRecord : public CodeEventRecord {
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public:
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Address instruction_start;
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const char* deopt_reason;
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int deopt_id;
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Address pc;
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int fp_to_sp_delta;
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CpuProfileDeoptFrame* deopt_frames;
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int deopt_frame_count;
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V8_INLINE void UpdateCodeMap(CodeMap* code_map);
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};
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class ReportBuiltinEventRecord : public CodeEventRecord {
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public:
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Address instruction_start;
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Builtins::Name builtin_id;
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V8_INLINE void UpdateCodeMap(CodeMap* code_map);
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};
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class TickSampleEventRecord {
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public:
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// The parameterless constructor is used when we dequeue data from
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// the ticks buffer.
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TickSampleEventRecord() { }
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explicit TickSampleEventRecord(unsigned order) : order(order) { }
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unsigned order;
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TickSample sample;
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};
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class CodeEventsContainer {
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public:
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explicit CodeEventsContainer(
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CodeEventRecord::Type type = CodeEventRecord::NONE) {
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generic.type = type;
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}
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union {
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CodeEventRecord generic;
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#define DECLARE_CLASS(ignore, type) type type##_;
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CODE_EVENTS_TYPE_LIST(DECLARE_CLASS)
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#undef DECLARE_CLASS
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};
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};
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// This class implements both the profile events processor thread and
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// methods called by event producers: VM and stack sampler threads.
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class ProfilerEventsProcessor : public base::Thread {
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public:
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ProfilerEventsProcessor(Isolate* isolate, ProfileGenerator* generator,
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base::TimeDelta period);
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virtual ~ProfilerEventsProcessor();
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// Thread control.
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virtual void Run();
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void StopSynchronously();
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V8_INLINE bool running() { return !!base::Relaxed_Load(&running_); }
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void Enqueue(const CodeEventsContainer& event);
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// Puts current stack into tick sample events buffer.
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void AddCurrentStack(Isolate* isolate, bool update_stats = false);
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void AddDeoptStack(Isolate* isolate, Address from, int fp_to_sp_delta);
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// Tick sample events are filled directly in the buffer of the circular
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// queue (because the structure is of fixed width, but usually not all
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// stack frame entries are filled.) This method returns a pointer to the
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// next record of the buffer.
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inline TickSample* StartTickSample();
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inline void FinishTickSample();
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// SamplingCircularQueue has stricter alignment requirements than a normal new
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// can fulfil, so we need to provide our own new/delete here.
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void* operator new(size_t size);
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void operator delete(void* ptr);
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sampler::Sampler* sampler() { return sampler_.get(); }
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private:
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// Called from events processing thread (Run() method.)
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bool ProcessCodeEvent();
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enum SampleProcessingResult {
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OneSampleProcessed,
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FoundSampleForNextCodeEvent,
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NoSamplesInQueue
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};
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SampleProcessingResult ProcessOneSample();
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ProfileGenerator* generator_;
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std::unique_ptr<sampler::Sampler> sampler_;
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base::Atomic32 running_;
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const base::TimeDelta period_; // Samples & code events processing period.
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LockedQueue<CodeEventsContainer> events_buffer_;
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static const size_t kTickSampleBufferSize = 1 * MB;
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static const size_t kTickSampleQueueLength =
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kTickSampleBufferSize / sizeof(TickSampleEventRecord);
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SamplingCircularQueue<TickSampleEventRecord,
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kTickSampleQueueLength> ticks_buffer_;
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LockedQueue<TickSampleEventRecord> ticks_from_vm_buffer_;
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std::atomic<unsigned> last_code_event_id_;
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unsigned last_processed_code_event_id_;
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};
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class CpuProfiler : public CodeEventObserver {
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public:
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explicit CpuProfiler(Isolate* isolate);
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CpuProfiler(Isolate* isolate, CpuProfilesCollection* profiles,
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ProfileGenerator* test_generator,
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ProfilerEventsProcessor* test_processor);
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~CpuProfiler() override;
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static void CollectSample(Isolate* isolate);
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typedef v8::CpuProfilingMode ProfilingMode;
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void set_sampling_interval(base::TimeDelta value);
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void CollectSample();
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void StartProfiling(const char* title, bool record_samples = false,
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ProfilingMode mode = ProfilingMode::kLeafNodeLineNumbers);
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void StartProfiling(String* title, bool record_samples, ProfilingMode mode);
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CpuProfile* StopProfiling(const char* title);
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CpuProfile* StopProfiling(String* title);
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int GetProfilesCount();
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CpuProfile* GetProfile(int index);
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void DeleteAllProfiles();
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void DeleteProfile(CpuProfile* profile);
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void CodeEventHandler(const CodeEventsContainer& evt_rec) override;
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bool is_profiling() const { return is_profiling_; }
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ProfileGenerator* generator() const { return generator_.get(); }
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ProfilerEventsProcessor* processor() const { return processor_.get(); }
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Isolate* isolate() const { return isolate_; }
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ProfilerListener* profiler_listener_for_test() {
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return profiler_listener_.get();
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}
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private:
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void StartProcessorIfNotStarted();
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void StopProcessorIfLastProfile(const char* title);
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void StopProcessor();
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void ResetProfiles();
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void LogBuiltins();
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void CreateEntriesForRuntimeCallStats();
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Isolate* const isolate_;
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base::TimeDelta sampling_interval_;
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std::unique_ptr<CpuProfilesCollection> profiles_;
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std::unique_ptr<ProfileGenerator> generator_;
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std::unique_ptr<ProfilerEventsProcessor> processor_;
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std::unique_ptr<ProfilerListener> profiler_listener_;
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bool saved_is_logging_;
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bool is_profiling_;
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DISALLOW_COPY_AND_ASSIGN(CpuProfiler);
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};
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} // namespace internal
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} // namespace v8
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#endif // V8_PROFILER_CPU_PROFILER_H_
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