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diff --git a/third_party/wasm2c/src/binding-hash.h b/third_party/wasm2c/src/binding-hash.h
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+++ b/third_party/wasm2c/src/binding-hash.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_BINDING_HASH_H_
+#define WABT_BINDING_HASH_H_
+
+#include <functional>
+#include <string>
+#include <unordered_map>
+#include <vector>
+
+#include "src/common.h"
+#include "src/string-view.h"
+
+namespace wabt {
+
+struct Var;
+
+struct Binding {
+  explicit Binding(Index index) : index(index) {}
+  Binding(const Location& loc, Index index) : loc(loc), index(index) {}
+
+  Location loc;
+  Index index;
+};
+
+// This class derives from a C++ container, which is usually not advisable
+// because they don't have virtual destructors. So don't delete a BindingHash
+// object through a pointer to std::unordered_multimap.
+class BindingHash : public std::unordered_multimap<std::string, Binding> {
+ public:
+  typedef std::function<void(const value_type&, const value_type&)>
+      DuplicateCallback;
+
+  void FindDuplicates(DuplicateCallback callback) const;
+
+  Index FindIndex(const Var&) const;
+
+  Index FindIndex(const std::string& name) const {
+    auto iter = find(name);
+    return iter != end() ? iter->second.index : kInvalidIndex;
+  }
+
+  Index FindIndex(string_view name) const {
+    return FindIndex(name.to_string());
+  }
+
+ private:
+  typedef std::vector<const value_type*> ValueTypeVector;
+
+  void CreateDuplicatesVector(ValueTypeVector* out_duplicates) const;
+  void SortDuplicatesVectorByLocation(ValueTypeVector* duplicates) const;
+  void CallCallbacks(const ValueTypeVector& duplicates,
+                     DuplicateCallback callback) const;
+};
+
+}  // namespace wabt
+
+#endif /* WABT_BINDING_HASH_H_ */