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diff --git a/third_party/wasm2c/include/wabt/tracing.h b/third_party/wasm2c/include/wabt/tracing.h
new file mode 100644
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+++ b/third_party/wasm2c/include/wabt/tracing.h
@@ -0,0 +1,73 @@
+/*
+ * Copyright 2017 WebAssembly Community Group participants
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef WABT_TRACING_H_
+#define WABT_TRACING_H_
+
+// Provides a simple tracing class that automatically generates enter/exit
+// messages using the scope of the instance.
+//
+// It also assumes that this file is only included in .cc files.
+// Immediately before the inclusion of this file, there is a define of
+// for WABT_TRACING, defining whether tracing should be compiled in for
+// that source file.
+
+#ifndef WABT_TRACING
+#define WABT_TRACING 0
+#endif
+
+#include "wabt/common.h"
+
+namespace wabt {
+
+#if WABT_TRACING
+
+// Scoped class that automatically prints enter("->") and exit("<-")
+// lines, indented by trace level.
+struct TraceScope {
+  WABT_DISALLOW_COPY_AND_ASSIGN(TraceScope);
+  TraceScope() = delete;
+  TraceScope(const char* method);
+  template <typename... Args>
+  TraceScope(const char* method, const char* format, Args&&... args)
+      : method_(method) {
+    PrintEnter(method);
+    fprintf(stderr, format, std::forward<Args>(args)...);
+    PrintNewline();
+  }
+  ~TraceScope();
+
+ private:
+  const char* method_;
+  void PrintEnter(const char* method);
+  void PrintNewline();
+};
+
+#define WABT_TRACE(method_name) TraceScope _func_(#method_name)
+
+#define WABT_TRACE_ARGS(method_name, format, ...) \
+  TraceScope _func_(#method_name, format, __VA_ARGS__)
+
+#else
+
+#define WABT_TRACE(method)
+#define WABT_TRACE_ARGS(method_name, format, ...)
+
+#endif
+
+}  // end namespace wabt
+
+#endif  // WABT_TRACING_H_