CSE2410 Fall 2014 Bounce

static const unsigned int kMaxCounters = 256;

// A single counter in a counter collection.

class Counter {

 public:

  static const int kMaxNameSize = 64;

  int32_t* Bind(const char* name) {

    int i;

    for (i = 0; i < kMaxNameSize - 1 && name[i]; i++) {

      name_[i] = name[i];

    }

    name_[i] = '\0';

    return &counter_;

  }

 private:

  int32_t counter_;

  uint8_t name_[kMaxNameSize];

};

// A set of counters and associated information.  An instance of this

// class is stored directly in the memory-mapped counters file if

// the --save-counters options is used

class CounterCollection {

 public:

  CounterCollection() {

    magic_number_ = 0xDEADFACE;

    max_counters_ = kMaxCounters;

    max_name_size_ = Counter::kMaxNameSize;

    counters_in_use_ = 0;

  }

  Counter* GetNextCounter() {

    if (counters_in_use_ == kMaxCounters) return NULL;

    return &counters_[counters_in_use_++];

  }

 private:

  uint32_t magic_number_;

  uint32_t max_counters_;

  uint32_t max_name_size_;

  uint32_t counters_in_use_;

  Counter counters_[kMaxCounters];

};

  Isolate* isolate = Isolate::GetCurrent();