Use TracedValue in runtime statistics.

src/counters.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/counters.h"
 
 #include <iomanip>
 
 #include "src/base/platform/platform.h"
 #include "src/isolate.h"
@@ skipping 259 matching lines @@
   uint64_t total_call_count = 0;
   base::TimeDelta total_time;
   std::vector<Entry> entries;
 };
 
 void RuntimeCallCounter::Reset() {
   count = 0;
   time = base::TimeDelta();
 }
 
-void RuntimeCallCounter::Dump(std::stringstream& out) {
-  out << "\"" << name << "\":[" << count << "," << time.InMicroseconds()
-      << "],";
+void RuntimeCallCounter::Dump(v8::tracing::TracedValue* value) {
+  value->BeginArray(name);
+  value->AppendLongInteger(count);
+  value->AppendLongInteger(time.InMicroseconds());
+  value->EndArray();
 }
 
 // static
 void RuntimeCallStats::Enter(RuntimeCallStats* stats, RuntimeCallTimer* timer,
                              CounterId counter_id) {
   RuntimeCallCounter* counter = &(stats->*counter_id);
   timer->Start(counter, stats->current_timer_);
   stats->current_timer_ = timer;
 }
 
@@ skipping 65 matching lines @@
   FOR_EACH_API_COUNTER(RESET_COUNTER)
 #undef RESET_COUNTER
 
 #define RESET_COUNTER(name) this->Handler_##name.Reset();
   FOR_EACH_HANDLER_COUNTER(RESET_COUNTER)
 #undef RESET_COUNTER
 
   in_use_ = true;
 }
 
-std::string RuntimeCallStats::Dump() {
-  buffer_.str(std::string());
-  buffer_.clear();
-  buffer_ << "{";
+void RuntimeCallStats::Dump(v8::tracing::TracedValue* value) {
 #define DUMP_COUNTER(name) \
-  if (this->name.count > 0) this->name.Dump(buffer_);
+  if (this->name.count > 0) this->name.Dump(value);
   FOR_EACH_MANUAL_COUNTER(DUMP_COUNTER)
 #undef DUMP_COUNTER
 
 #define DUMP_COUNTER(name, nargs, result_size) \
-  if (this->Runtime_##name.count > 0) this->Runtime_##name.Dump(buffer_);
+  if (this->Runtime_##name.count > 0) this->Runtime_##name.Dump(value);
   FOR_EACH_INTRINSIC(DUMP_COUNTER)
 #undef DUMP_COUNTER
 
 #define DUMP_COUNTER(name) \
-  if (this->Builtin_##name.count > 0) this->Builtin_##name.Dump(buffer_);
+  if (this->Builtin_##name.count > 0) this->Builtin_##name.Dump(value);
   BUILTIN_LIST_C(DUMP_COUNTER)
 #undef DUMP_COUNTER
 
 #define DUMP_COUNTER(name) \
-  if (this->API_##name.count > 0) this->API_##name.Dump(buffer_);
+  if (this->API_##name.count > 0) this->API_##name.Dump(value);
   FOR_EACH_API_COUNTER(DUMP_COUNTER)
 #undef DUMP_COUNTER
 
 #define DUMP_COUNTER(name) \
-  if (this->Handler_##name.count > 0) this->Handler_##name.Dump(buffer_);
+  if (this->Handler_##name.count > 0) this->Handler_##name.Dump(value);
   FOR_EACH_HANDLER_COUNTER(DUMP_COUNTER)
 #undef DUMP_COUNTER
-  buffer_ << "\"END\":[]}";
+
   in_use_ = false;
-  return buffer_.str();
 }
 
 }  // namespace internal
 }  // namespace v8