src/cpu-profiler.cc

// Copyright 2010 the V8 project authors. All rights reserved.
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#include "v8.h"

#include "cpu-profiler-inl.h"

namespace v8 {
namespace internal {


static const int kEventsBufferSize = 256*KB;
static const int kTickSamplesBufferChunkSize = 64*KB;
static const int kTickSamplesBufferChunksCount = 16;


ProfilerEventsProcessor::ProfilerEventsProcessor(ProfileGenerator* generator)
    : generator_(generator),
      running_(false),
      events_buffer_(kEventsBufferSize),
      ticks_buffer_(sizeof(TickSampleEventRecord),
                    kTickSamplesBufferChunkSize,
                    kTickSamplesBufferChunksCount),
      enqueue_order_(0) { }


void ProfilerEventsProcessor::CodeCreateEvent(Logger::LogEventsAndTags tag,
                                              String* name,
                                              String* resource_name,
                                              int line_number,
                                              Address start,
                                              unsigned size) {
  CodeEventsContainer evt_rec;
  CodeCreateEventRecord* rec = &evt_rec.CodeCreateEventRecord_;
  rec->type = CodeEventRecord::CODE_CREATION;
  rec->order = ++enqueue_order_;
  rec->start = start;
  rec->entry = generator_->NewCodeEntry(tag, name, resource_name, line_number);
  rec->size = size;
  events_buffer_.Enqueue(evt_rec);
}


void ProfilerEventsProcessor::CodeCreateEvent(Logger::LogEventsAndTags tag,
                                              const char* name,
                                              Address start,
                                              unsigned size) {
  CodeEventsContainer evt_rec;
  CodeCreateEventRecord* rec = &evt_rec.CodeCreateEventRecord_;
  rec->type = CodeEventRecord::CODE_CREATION;
  rec->order = ++enqueue_order_;
  rec->start = start;
  rec->entry = generator_->NewCodeEntry(tag, name);
  rec->size = size;
  events_buffer_.Enqueue(evt_rec);
}


void ProfilerEventsProcessor::CodeCreateEvent(Logger::LogEventsAndTags tag,
                                              int args_count,
                                              Address start,
                                              unsigned size) {
  CodeEventsContainer evt_rec;
  CodeCreateEventRecord* rec = &evt_rec.CodeCreateEventRecord_;
  rec->type = CodeEventRecord::CODE_CREATION;
  rec->order = ++enqueue_order_;
  rec->start = start;
  rec->entry = generator_->NewCodeEntry(tag, args_count);
  rec->size = size;
  events_buffer_.Enqueue(evt_rec);
}


void ProfilerEventsProcessor::CodeMoveEvent(Address from, Address to) {
  CodeEventsContainer evt_rec;
  CodeMoveEventRecord* rec = &evt_rec.CodeMoveEventRecord_;
  rec->type = CodeEventRecord::CODE_MOVE;
  rec->order = ++enqueue_order_;
  rec->from = from;
  rec->to = to;
  events_buffer_.Enqueue(evt_rec);
}


void ProfilerEventsProcessor::CodeDeleteEvent(Address from) {
  CodeEventsContainer evt_rec;
  CodeDeleteEventRecord* rec = &evt_rec.CodeDeleteEventRecord_;
  rec->type = CodeEventRecord::CODE_DELETE;
  rec->order = ++enqueue_order_;
  rec->start = from;
  events_buffer_.Enqueue(evt_rec);
}


void ProfilerEventsProcessor::FunctionCreateEvent(Address alias,
                                                  Address start) {
  CodeEventsContainer evt_rec;
  CodeAliasEventRecord* rec = &evt_rec.CodeAliasEventRecord_;
  rec->type = CodeEventRecord::CODE_ALIAS;
  rec->order = ++enqueue_order_;
  rec->alias = alias;
  rec->start = start;
  events_buffer_.Enqueue(evt_rec);
}


void ProfilerEventsProcessor::FunctionMoveEvent(Address from, Address to) {
  CodeMoveEvent(from, to);
}


void ProfilerEventsProcessor::FunctionDeleteEvent(Address from) {
  CodeDeleteEvent(from);
}


bool ProfilerEventsProcessor::ProcessCodeEvent(unsigned* dequeue_order) {
  if (!events_buffer_.IsEmpty()) {
    CodeEventsContainer record;
    events_buffer_.Dequeue(&record);
    switch (record.generic.type) {
#define PROFILER_TYPE_CASE(type, clss)                          \
      case CodeEventRecord::type:                               \
        record.clss##_.UpdateCodeMap(generator_->code_map());   \
        break;

      CODE_EVENTS_TYPE_LIST(PROFILER_TYPE_CASE)

#undef PROFILER_TYPE_CASE
      default: return true;  // Skip record.
    }
    *dequeue_order = record.generic.order;
    return true;
  }
  return false;
}


bool ProfilerEventsProcessor::ProcessTicks(unsigned dequeue_order) {
  while (true) {
    const TickSampleEventRecord* rec =
        reinterpret_cast<TickSampleEventRecord*>(ticks_buffer_.StartDequeue());
    if (rec == NULL) return false;
    if (rec->order == dequeue_order) {
      generator_->RecordTickSample(rec->sample);
      ticks_buffer_.FinishDequeue();
    } else {
      return true;
    }
  }
}


void ProfilerEventsProcessor::Run() {
  unsigned dequeue_order = 0;
  running_ = true;

  while (running_) {
    // Process ticks until we have any.
    if (ProcessTicks(dequeue_order)) {
      // All ticks of the current dequeue_order are processed,
      // proceed to the next code event.
      ProcessCodeEvent(&dequeue_order);
    }
    YieldCPU();
  }

  // Process remaining tick events.
  ticks_buffer_.FlushResidualRecords();
  // Perform processing until we have tick events, skip remaining code events.
  while (ProcessTicks(dequeue_order) && ProcessCodeEvent(&dequeue_order)) { }
}


} }  // namespace v8::internal