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diff --git a/third_party/wasm2c/include/wabt/binary-reader-opcnt.h b/third_party/wasm2c/include/wabt/binary-reader-opcnt.h
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index 0000000000..8c3a9aba8d
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+++ b/third_party/wasm2c/include/wabt/binary-reader-opcnt.h
@@ -0,0 +1,96 @@
+/*
+ * 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_BINARY_READER_OPCNT_H_
+#define WABT_BINARY_READER_OPCNT_H_
+
+#include <map>
+#include <vector>
+
+#include "wabt/common.h"
+#include "wabt/opcode.h"
+
+namespace wabt {
+
+struct Module;
+struct ReadBinaryOptions;
+class Stream;
+
+class OpcodeInfo {
+ public:
+  enum class Kind {
+    Bare,
+    Uint32,
+    Uint64,
+    Index,
+    Float32,
+    Float64,
+    Uint32Uint32,
+    Uint32Uint32Uint32,
+    Uint32Uint32Uint32Uint32,
+    BlockSig,
+    BrTable,
+    V128,
+  };
+
+  explicit OpcodeInfo(Opcode, Kind);
+  template <typename T>
+  OpcodeInfo(Opcode, Kind, T* data, size_t count = 1);
+  template <typename T>
+  OpcodeInfo(Opcode, Kind, T* data, size_t count, T extra);
+
+  Opcode opcode() const { return opcode_; }
+
+  void Write(Stream&);
+
+ private:
+  template <typename T>
+  std::pair<const T*, size_t> GetDataArray() const;
+  template <typename T>
+  const T* GetData(size_t expected_size = 1) const;
+
+  template <typename T, typename F>
+  void WriteArray(Stream& stream, F&& write_func);
+
+  Opcode opcode_;
+  Kind kind_;
+  std::vector<uint8_t> data_;
+
+  friend bool operator==(const OpcodeInfo&, const OpcodeInfo&);
+  friend bool operator!=(const OpcodeInfo&, const OpcodeInfo&);
+  friend bool operator<(const OpcodeInfo&, const OpcodeInfo&);
+  friend bool operator<=(const OpcodeInfo&, const OpcodeInfo&);
+  friend bool operator>(const OpcodeInfo&, const OpcodeInfo&);
+  friend bool operator>=(const OpcodeInfo&, const OpcodeInfo&);
+};
+
+bool operator==(const OpcodeInfo&, const OpcodeInfo&);
+bool operator!=(const OpcodeInfo&, const OpcodeInfo&);
+bool operator<(const OpcodeInfo&, const OpcodeInfo&);
+bool operator<=(const OpcodeInfo&, const OpcodeInfo&);
+bool operator>(const OpcodeInfo&, const OpcodeInfo&);
+bool operator>=(const OpcodeInfo&, const OpcodeInfo&);
+
+using OpcodeInfoCounts = std::map<OpcodeInfo, size_t>;
+
+Result ReadBinaryOpcnt(const void* data,
+                       size_t size,
+                       const ReadBinaryOptions& options,
+                       OpcodeInfoCounts* opcode_counts);
+
+}  // namespace wabt
+
+#endif /* WABT_BINARY_READER_OPCNT_H_ */