1 files changed, 68 insertions, 0 deletions
diff --git a/src/tracing/traced_value.h b/src/tracing/traced_value.h
new file mode 100644
index 0000000000..84e24c9525
--- /dev/null
+++ b/src/tracing/traced_value.h
@@ -0,0 +1,68 @@
+// Copyright 2016 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.
+
+#ifndef SRC_TRACING_TRACED_VALUE_H_
+#define SRC_TRACING_TRACED_VALUE_H_
+
+#include "node_internals.h"
+#include "v8.h"
+
+#include <stddef.h>
+#include <memory>
+#include <string>
+
+namespace node {
+namespace tracing {
+
+class TracedValue : public v8::ConvertableToTraceFormat {
+ public:
+  ~TracedValue() override;
+
+  static std::unique_ptr<TracedValue> Create();
+  static std::unique_ptr<TracedValue> CreateArray();
+
+  void EndDictionary();
+  void EndArray();
+
+  // These methods assume that |name| is a long lived "quoted" string.
+  void SetInteger(const char* name, int value);
+  void SetDouble(const char* name, double value);
+  void SetBoolean(const char* name, bool value);
+  void SetNull(const char* name);
+  void SetString(const char* name, const char* value);
+  void SetString(const char* name, const std::string& value) {
+    SetString(name, value.c_str());
+  }
+  void BeginDictionary(const char* name);
+  void BeginArray(const char* name);
+
+  void AppendInteger(int);
+  void AppendDouble(double);
+  void AppendBoolean(bool);
+  void AppendNull();
+  void AppendString(const char*);
+  void AppendString(const std::string& value) { AppendString(value.c_str()); }
+  void BeginArray();
+  void BeginDictionary();
+
+  // ConvertableToTraceFormat implementation.
+  void AppendAsTraceFormat(std::string* out) const override;
+
+ private:
+  explicit TracedValue(bool root_is_array = false);
+
+  void WriteComma();
+  void WriteName(const char* name);
+
+  std::string data_;
+  bool first_item_;
+  bool root_is_array_;
+
+  DISALLOW_COPY_AND_ASSIGN(TracedValue);
+};
+
+}  // namespace tracing
+}  // namespace node
+
+#endif  // SRC_TRACING_TRACED_VALUE_H_