Add node bindings

scripts/perf-counters/src/perf-counters.cpp

@@ -0,0 +1,55 @@
+/**
+ * Copyright 2013-2015, Facebook, Inc.
+ * All rights reserved.
+ *
+ * This source code is licensed under the BSD-style license found in the
+ * LICENSE file in the root directory of this source tree. An additional grant
+ * of patent rights can be found in the PATENTS file in the same directory.
+ */
+
+#include <node.h>
+
+#include "hardware-counter.h"
+
+namespace PerfCounters {
+
+using HPHP::HardwareCounter;
+
+void Init(const v8::FunctionCallbackInfo<v8::Value>& args) {
+  // TODO: Allow customizing recorded events
+  bool enable = true;
+  std::string events = "";
+  bool recordSubprocesses = false;
+  HardwareCounter::Init(enable, events, recordSubprocesses);
+  HardwareCounter::s_counter.getCheck();
+}
+
+void GetCounters(const v8::FunctionCallbackInfo<v8::Value>& args) {
+  v8::Isolate* isolate = args.GetIsolate();
+  v8::Local<v8::Object> obj = v8::Object::New(isolate);
+  std::pair<v8::Isolate*, v8::Local<v8::Object>> pair(isolate, obj);
+
+  HardwareCounter::GetPerfEvents(
+    [](const std::string& key, int64_t value, void* data) {
+      std::pair<v8::Isolate*, v8::Local<v8::Object>>& pair =
+        *reinterpret_cast<std::pair<v8::Isolate*, v8::Local<v8::Object>>*>(data);
+      v8::Isolate* isolate = pair.first;
+      v8::Local<v8::Object> obj = pair.second;
+      obj->Set(
+        v8::String::NewFromUtf8(isolate, key.c_str()),
+        v8::Number::New(isolate, value)
+      );
+    },
+    &pair);
+
+  args.GetReturnValue().Set(obj);
+}
+
+void InitModule(v8::Local<v8::Object> exports) {
+  NODE_SET_METHOD(exports, "init", Init);
+  NODE_SET_METHOD(exports, "getCounters", GetCounters);
+}
+
+NODE_MODULE(perfcounters, InitModule)
+
+}