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diff --git a/third_party/wasm2c/src/option-parser.h b/third_party/wasm2c/src/option-parser.h
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+/*
+ * Copyright 2016 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_OPTION_PARSER_H_
+#define WABT_OPTION_PARSER_H_
+
+#include <functional>
+#include <string>
+#include <vector>
+
+#include "src/common.h"
+
+namespace wabt {
+
+class OptionParser {
+ public:
+  enum class HasArgument { No, Yes };
+  enum class ArgumentCount { One, OneOrMore, ZeroOrMore };
+
+  struct Option;
+  typedef std::function<void(const char*)> Callback;
+  typedef std::function<void()> NullCallback;
+
+  struct Option {
+    Option(char short_name,
+           const std::string& long_name,
+           const std::string& metavar,
+           HasArgument has_argument,
+           const std::string& help,
+           const Callback&);
+
+    char short_name;
+    std::string long_name;
+    std::string metavar;
+    bool has_argument;
+    std::string help;
+    Callback callback;
+  };
+
+  struct Argument {
+    Argument(const std::string& name, ArgumentCount, const Callback&);
+
+    std::string name;
+    ArgumentCount count;
+    Callback callback;
+    int handled_count = 0;
+  };
+
+  explicit OptionParser(const char* program_name, const char* description);
+
+  void AddOption(const Option&);
+  void AddArgument(const std::string& name, ArgumentCount, const Callback&);
+  void SetErrorCallback(const Callback&);
+  void Parse(int argc, char* argv[]);
+  void PrintHelp();
+
+  // Helper functions.
+  void AddOption(char short_name,
+                 const char* long_name,
+                 const char* help,
+                 const NullCallback&);
+  void AddOption(const char* long_name, const char* help, const NullCallback&);
+  void AddOption(char short_name,
+                 const char* long_name,
+                 const char* metavar,
+                 const char* help,
+                 const Callback&);
+
+ private:
+  static int Match(const char* s, const std::string& full, bool has_argument);
+  void WABT_PRINTF_FORMAT(2, 3) Errorf(const char* format, ...);
+  void HandleArgument(size_t* arg_index, const char* arg_value);
+
+  // Print the error and exit(1).
+  void DefaultError(const std::string&);
+
+  std::string program_name_;
+  std::string description_;
+  std::vector<Option> options_;
+  std::vector<Argument> arguments_;
+  Callback on_error_;
+};
+
+}  // namespace wabt
+
+#endif /* WABT_OPTION_PARSER_H_ */