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diff --git a/src/ir/module-utils.h b/src/ir/module-utils.h
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+/*
+ * 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 wasm_ir_module_h
+#define wasm_ir_module_h
+
+#include "wasm.h"
+
+namespace wasm {
+
+namespace ModuleUtils {
+
+// Computes the indexes in a wasm binary, i.e., with function imports
+// and function implementations sharing a single index space, etc.
+struct BinaryIndexes {
+  std::unordered_map<Name, Index> functionIndexes;
+  std::unordered_map<Name, Index> globalIndexes;
+
+  BinaryIndexes(Module& wasm) {
+    for (Index i = 0; i < wasm.imports.size(); i++) {
+      auto& import = wasm.imports[i];
+      if (import->kind == ExternalKind::Function) {
+        auto index = functionIndexes.size();
+        functionIndexes[import->name] = index;
+      } else if (import->kind == ExternalKind::Global) {
+        auto index = globalIndexes.size();
+        globalIndexes[import->name] = index;
+      }
+    }
+    for (Index i = 0; i < wasm.functions.size(); i++) {
+      auto index = functionIndexes.size();
+      functionIndexes[wasm.functions[i]->name] = index;
+    }
+    for (Index i = 0; i < wasm.globals.size(); i++) {
+      auto index = globalIndexes.size();
+      globalIndexes[wasm.globals[i]->name] = index;
+    }
+  }
+};
+
+} // namespace ModuleUtils
+
+} // namespace wasm
+
+#endif // wasm_ir_module_h
+