TickSample Struct Reference

#include <v8-profiler.h>

Public Types
enum	RecordCEntryFrame { kIncludeCEntryFrame, kSkipCEntryFrame }

Public Member Functions
	TickSample ()
void	Init (Isolate *isolate, const v8::RegisterState &state, RecordCEntryFrame record_c_entry_frame, bool update_stats, bool use_simulator_reg_state=true)

Static Public Member Functions
static bool	GetStackSample (Isolate *isolate, v8::RegisterState *state, RecordCEntryFrame record_c_entry_frame, void **frames, size_t frames_limit, v8::SampleInfo *sample_info, bool use_simulator_reg_state=true)

Data Fields
StateTag	state
void *	pc
union {
void *   tos
void *   external_callback_entry
};
void *	stack [kMaxFramesCount]
unsigned	frames_count: kMaxFramesCountLog2
bool	has_external_callback: 1
bool	update_stats: 1

Static Public Attributes
static const unsigned	kMaxFramesCountLog2 = 8
static const unsigned	kMaxFramesCount = (1 << kMaxFramesCountLog2) - 1

Detailed Description

Definition at line 51 of file v8-profiler.h.

Member Enumeration Documentation

RecordCEntryFrame

enum RecordCEntryFrame

Enumerator
kIncludeCEntryFrame
kSkipCEntryFrame

Definition at line 55 of file v8-profiler.h.

Constructor & Destructor Documentation

TickSample()

TickSample ( )

inline

Definition at line 57 of file v8-profiler.h.

Member Function Documentation

GetStackSample()

static bool GetStackSample ( Isolate *  isolate, v8::RegisterState *  state, RecordCEntryFrame  record_c_entry_frame, void **  frames, size_t  frames_limit, v8::SampleInfo *  sample_info, bool  use_simulator_reg_state = true  )

static

Get a call stack sample from the isolate.

Parameters

isolate	The isolate.
state	Register state.
record_c_entry_frame	Include or skip the runtime function.
frames	Caller allocated buffer to store stack frames.
frames_limit	Maximum number of frames to capture. The buffer must be large enough to hold the number of frames.
sample_info	The sample info is filled up by the function provides number of actual captured stack frames and the current VM state.
use_simulator_reg_state	When set to true and V8 is running under a simulator, the method will use the simulator register state rather than the one provided with |state| argument. Otherwise the method will use provided register |state| as is.

Note

GetStackSample is thread and signal safe and should only be called when the JS thread is paused or interrupted. Otherwise the behavior is undefined.

Init()

void Init	(	Isolate *	isolate,
		const v8::RegisterState &	state,
		RecordCEntryFrame	record_c_entry_frame,
		bool	update_stats,
		bool	use_simulator_reg_state = true
	)

Initialize a tick sample from the isolate.

Parameters

isolate	The isolate.
state	Execution state.
record_c_entry_frame	Include or skip the runtime function.
update_stats	Whether update the sample to the aggregated stats.
use_simulator_reg_state	When set to true and V8 is running under a simulator, the method will use the simulator register state rather than the one provided with |state| argument. Otherwise the method will use provided register |state| as is.

Field Documentation

@5

union { ... }

external_callback_entry

void* external_callback_entry

Definition at line 109 of file v8-profiler.h.

frames_count

unsigned frames_count

Definition at line 114 of file v8-profiler.h.

has_external_callback

bool has_external_callback

Definition at line 115 of file v8-profiler.h.

kMaxFramesCount

const unsigned kMaxFramesCount = (1 << kMaxFramesCountLog2) - 1

static

Definition at line 112 of file v8-profiler.h.

kMaxFramesCountLog2

const unsigned kMaxFramesCountLog2 = 8

static

Definition at line 111 of file v8-profiler.h.

pc

void* pc

Definition at line 106 of file v8-profiler.h.

stack

void* stack[kMaxFramesCount]

Definition at line 113 of file v8-profiler.h.

state

StateTag state

Definition at line 105 of file v8-profiler.h.

tos

void* tos

Definition at line 108 of file v8-profiler.h.

update_stats

bool update_stats

Definition at line 116 of file v8-profiler.h.

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The documentation for this struct was generated from the following file:

• include/v8-profiler.h