dart::SampleBlockBuffer Class Reference

#include <profiler.h>

Public Member Functions
	SampleBlockBuffer (intptr_t blocks=kDefaultBlockCount, intptr_t samples_per_block=SampleBlock::kSamplesPerBlock)
virtual	~SampleBlockBuffer ()
void	VisitSamples (SampleVisitor *visitor)
void	FreeCompletedBlocks ()
Sample *	ReserveCPUSample (Isolate *isolate)
Sample *	ReserveAllocationSample (Isolate *isolate)
intptr_t	Size () const
ProcessedSampleBuffer *	BuildProcessedSampleBuffer (Isolate *isolate, SampleFilter *filter, ProcessedSampleBuffer *buffer=nullptr)

Static Public Attributes
static constexpr intptr_t	kDefaultBlockCount = 600

Friends
class	Isolate

Detailed Description

Definition at line 735 of file profiler.h.

Constructor & Destructor Documentation

SampleBlockBuffer()

dart::SampleBlockBuffer::SampleBlockBuffer ( intptr_t  blocks = kDefaultBlockCount, intptr_t  samples_per_block = SampleBlock::kSamplesPerBlock  )

explicit

Definition at line 664 of file profiler.cc.

                                                                 {
  const intptr_t size = Utils::RoundUp(
      blocks * samples_per_block * sizeof(Sample), VirtualMemory::PageSize());
  const bool executable = false;
  const bool compressed = false;
  memory_ =
      VirtualMemory::Allocate(size, executable, compressed, "dart-profiler");
  if (memory_ == nullptr) {
    OUT_OF_MEMORY();
  }
  sample_buffer_ = reinterpret_cast<Sample*>(memory_->address());
  blocks_ = new SampleBlock[blocks];
  for (intptr_t i = 0; i < blocks; ++i) {
    blocks_[i].Init(&sample_buffer_[i * samples_per_block], samples_per_block);
  }
  capacity_ = blocks;
  cursor_ = 0;
}

~SampleBlockBuffer()

dart::SampleBlockBuffer::~SampleBlockBuffer ( )

virtual

Definition at line 684 of file profiler.cc.

                                      {
  delete[] blocks_;
  blocks_ = nullptr;
  delete memory_;
  memory_ = nullptr;
  capacity_ = 0;
  cursor_ = 0;
}

Member Function Documentation

BuildProcessedSampleBuffer()

ProcessedSampleBuffer * dart::SampleBlockBuffer::BuildProcessedSampleBuffer	(	Isolate *	isolate,
		SampleFilter *	filter,
		ProcessedSampleBuffer *	buffer = nullptr
	)

Definition at line 755 of file profiler.cc.

                                   {
  ASSERT(isolate != nullptr);
 
  Thread* thread = Thread::Current();
  Zone* zone = thread->zone();
 
  if (buffer == nullptr) {
    buffer = new (zone) ProcessedSampleBuffer();
  }
 
  FlushSampleBlocks(isolate);
 
  for (intptr_t i = 0; i < capacity_; ++i) {
    SampleBlock* block = &blocks_[i];
    if (block->TryAcquireStreaming(isolate)) {
      block->BuildProcessedSampleBuffer(filter, buffer);
      if (filter->take_samples()) {
        block->StreamingToFree();
      } else {
        block->StreamingToCompleted();
      }
    }
  }
 
  return buffer;
}

FreeCompletedBlocks()

void dart::SampleBlockBuffer::FreeCompletedBlocks

(

)

Definition at line 718 of file profiler.cc.

                                            {
  for (intptr_t i = 0; i < capacity_; i++) {
    blocks_[i].FreeCompleted();
  }
}

ReserveAllocationSample()

Sample * dart::SampleBlockBuffer::ReserveAllocationSample

(

Isolate *

isolate

)

Definition at line 815 of file profiler.cc.

                                                                   {
  return ReserveSampleImpl(isolate, true);
}

ReserveCPUSample()

Sample * dart::SampleBlockBuffer::ReserveCPUSample

(

Isolate *

isolate

)

Definition at line 811 of file profiler.cc.

                                                            {
  return ReserveSampleImpl(isolate, false);
}

Size()

intptr_t dart::SampleBlockBuffer::Size ( ) const

inline

Definition at line 768 of file profiler.h.

{ return memory_->size(); }

VisitSamples()

void dart::SampleBlockBuffer::VisitSamples ( SampleVisitor *  visitor )

inline

Definition at line 749 of file profiler.h.

                                            {
    ASSERT(visitor != nullptr);
    for (intptr_t i = 0; i < capacity_; ++i) {
      blocks_[i].VisitSamples(visitor);
    }
  }

Friends And Related Symbol Documentation

Isolate

friend class Isolate

friend

Definition at line 790 of file profiler.h.

Member Data Documentation

kDefaultBlockCount

constexpr intptr_t dart::SampleBlockBuffer::kDefaultBlockCount = 600

staticconstexpr

Definition at line 737 of file profiler.h.

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The documentation for this class was generated from the following files:

• third_party/dart-lang/sdk/runtime/vm/profiler.h
• third_party/dart-lang/sdk/runtime/vm/profiler.cc