diff --git a/src/extensions/statistics-extension.cc b/src/extensions/statistics-extension.cc
new file mode 100644
index 0000000..6f63245
--- /dev/null
+++ b/src/extensions/statistics-extension.cc
@@ -0,0 +1,150 @@
+// 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/extensions/statistics-extension.h"
+
+namespace v8 {
+namespace internal {
+
+const char* const StatisticsExtension::kSource =
+    "native function getV8Statistics();";
+
+
+v8::Handle<v8::FunctionTemplate> StatisticsExtension::GetNativeFunctionTemplate(
+    v8::Isolate* isolate,
+    v8::Handle<v8::String> str) {
+  DCHECK(strcmp(*v8::String::Utf8Value(str), "getV8Statistics") == 0);
+  return v8::FunctionTemplate::New(isolate, StatisticsExtension::GetCounters);
+}
+
+
+static void AddCounter(v8::Isolate* isolate,
+                       v8::Local<v8::Object> object,
+                       StatsCounter* counter,
+                       const char* name) {
+  if (counter->Enabled()) {
+    object->Set(v8::String::NewFromUtf8(isolate, name),
+                v8::Number::New(isolate, *counter->GetInternalPointer()));
+  }
+}
+
+static void AddNumber(v8::Isolate* isolate,
+                      v8::Local<v8::Object> object,
+                      intptr_t value,
+                      const char* name) {
+  object->Set(v8::String::NewFromUtf8(isolate, name),
+              v8::Number::New(isolate, static_cast<double>(value)));
+}
+
+
+static void AddNumber64(v8::Isolate* isolate,
+                        v8::Local<v8::Object> object,
+                        int64_t value,
+                        const char* name) {
+  object->Set(v8::String::NewFromUtf8(isolate, name),
+              v8::Number::New(isolate, static_cast<double>(value)));
+}
+
+
+void StatisticsExtension::GetCounters(
+    const v8::FunctionCallbackInfo<v8::Value>& args) {
+  Isolate* isolate = reinterpret_cast<Isolate*>(args.GetIsolate());
+  Heap* heap = isolate->heap();
+
+  if (args.Length() > 0) {  // GC if first argument evaluates to true.
+    if (args[0]->IsBoolean() && args[0]->ToBoolean()->Value()) {
+      heap->CollectAllGarbage(Heap::kNoGCFlags, "counters extension");
+    }
+  }
+
+  Counters* counters = isolate->counters();
+  v8::Local<v8::Object> result = v8::Object::New(args.GetIsolate());
+
+#define ADD_COUNTER(name, caption)                                            \
+  AddCounter(args.GetIsolate(), result, counters->name(), #name);
+
+  STATS_COUNTER_LIST_1(ADD_COUNTER)
+  STATS_COUNTER_LIST_2(ADD_COUNTER)
+#undef ADD_COUNTER
+#define ADD_COUNTER(name)                                                      \
+  AddCounter(args.GetIsolate(), result, counters->count_of_##name(),           \
+             "count_of_" #name);                                               \
+  AddCounter(args.GetIsolate(), result, counters->size_of_##name(),            \
+             "size_of_" #name);
+
+  INSTANCE_TYPE_LIST(ADD_COUNTER)
+#undef ADD_COUNTER
+#define ADD_COUNTER(name)                                                      \
+  AddCounter(args.GetIsolate(), result, counters->count_of_CODE_TYPE_##name(), \
+             "count_of_CODE_TYPE_" #name);                                     \
+  AddCounter(args.GetIsolate(), result, counters->size_of_CODE_TYPE_##name(),  \
+             "size_of_CODE_TYPE_" #name);
+
+  CODE_KIND_LIST(ADD_COUNTER)
+#undef ADD_COUNTER
+#define ADD_COUNTER(name)                                                      \
+  AddCounter(args.GetIsolate(), result,                                        \
+             counters->count_of_FIXED_ARRAY_##name(),                          \
+             "count_of_FIXED_ARRAY_" #name);                                   \
+  AddCounter(args.GetIsolate(), result,                                        \
+             counters->size_of_FIXED_ARRAY_##name(),                           \
+             "size_of_FIXED_ARRAY_" #name);
+
+  FIXED_ARRAY_SUB_INSTANCE_TYPE_LIST(ADD_COUNTER)
+#undef ADD_COUNTER
+
+  AddNumber(args.GetIsolate(), result, isolate->memory_allocator()->Size(),
+            "total_committed_bytes");
+  AddNumber(args.GetIsolate(), result, heap->new_space()->Size(),
+            "new_space_live_bytes");
+  AddNumber(args.GetIsolate(), result, heap->new_space()->Available(),
+            "new_space_available_bytes");
+  AddNumber(args.GetIsolate(), result, heap->new_space()->CommittedMemory(),
+            "new_space_commited_bytes");
+  AddNumber(args.GetIsolate(), result, heap->old_pointer_space()->Size(),
+            "old_pointer_space_live_bytes");
+  AddNumber(args.GetIsolate(), result, heap->old_pointer_space()->Available(),
+            "old_pointer_space_available_bytes");
+  AddNumber(args.GetIsolate(), result,
+            heap->old_pointer_space()->CommittedMemory(),
+            "old_pointer_space_commited_bytes");
+  AddNumber(args.GetIsolate(), result, heap->old_data_space()->Size(),
+            "old_data_space_live_bytes");
+  AddNumber(args.GetIsolate(), result, heap->old_data_space()->Available(),
+            "old_data_space_available_bytes");
+  AddNumber(args.GetIsolate(), result,
+            heap->old_data_space()->CommittedMemory(),
+            "old_data_space_commited_bytes");
+  AddNumber(args.GetIsolate(), result, heap->code_space()->Size(),
+            "code_space_live_bytes");
+  AddNumber(args.GetIsolate(), result, heap->code_space()->Available(),
+            "code_space_available_bytes");
+  AddNumber(args.GetIsolate(), result, heap->code_space()->CommittedMemory(),
+            "code_space_commited_bytes");
+  AddNumber(args.GetIsolate(), result, heap->cell_space()->Size(),
+            "cell_space_live_bytes");
+  AddNumber(args.GetIsolate(), result, heap->cell_space()->Available(),
+            "cell_space_available_bytes");
+  AddNumber(args.GetIsolate(), result, heap->cell_space()->CommittedMemory(),
+            "cell_space_commited_bytes");
+  AddNumber(args.GetIsolate(), result, heap->property_cell_space()->Size(),
+            "property_cell_space_live_bytes");
+  AddNumber(args.GetIsolate(), result, heap->property_cell_space()->Available(),
+            "property_cell_space_available_bytes");
+  AddNumber(args.GetIsolate(), result,
+            heap->property_cell_space()->CommittedMemory(),
+            "property_cell_space_commited_bytes");
+  AddNumber(args.GetIsolate(), result, heap->lo_space()->Size(),
+            "lo_space_live_bytes");
+  AddNumber(args.GetIsolate(), result, heap->lo_space()->Available(),
+            "lo_space_available_bytes");
+  AddNumber(args.GetIsolate(), result, heap->lo_space()->CommittedMemory(),
+            "lo_space_commited_bytes");
+  AddNumber64(args.GetIsolate(), result,
+              heap->amount_of_external_allocated_memory(),
+              "amount_of_external_allocated_memory");
+  args.GetReturnValue().Set(result);
+}
+
+} }  // namespace v8::internal