Runtime call counters and timers.

src/runtime/runtime-internal.cc

 // Copyright 2014 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/runtime/runtime-utils.h"
 
 #include "src/arguments.h"
 #include "src/ast/prettyprinter.h"
 #include "src/bootstrapper.h"
 #include "src/conversions.h"
@@ skipping 459 matching lines @@
 
 
 RUNTIME_FUNCTION(Runtime_IncrementUseCounter) {
   HandleScope scope(isolate);
   DCHECK_EQ(1, args.length());
   CONVERT_SMI_ARG_CHECKED(counter, 0);
   isolate->CountUsage(static_cast<v8::Isolate::UseCounterFeature>(counter));
   return isolate->heap()->undefined_value();
 }
 
+
+RUNTIME_FUNCTION(Runtime_GetAndResetRuntimeCallStats) {
+  HandleScope scope(isolate);
+  DCHECK_EQ(0, args.length());
+  std::stringstream stats_stream;
+  isolate->runtime_state()->runtime_call_stats()->Print(stats_stream);
+  Handle<String> result =
+      isolate->factory()->NewStringFromAsciiChecked(stats_stream.str().c_str());
+  isolate->runtime_state()->runtime_call_stats()->Reset();
+  return *result;
+}
+
 }  // namespace internal
 }  // namespace v8