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diff --git a/src/tools/wasm-split/instrumenter.h b/src/tools/wasm-split/instrumenter.h
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+++ b/src/tools/wasm-split/instrumenter.h
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+/*
+ * Copyright 2021 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_tools_wasm_split_instrumenter_h
+#define wasm_tools_wasm_split_instrumenter_h
+
+#include "pass.h"
+
+namespace wasm {
+
+// Add a global monotonic counter and a timestamp global for each function, code
+// at the beginning of each function to set its timestamp, and a new exported
+// function for dumping the profile data.
+struct Instrumenter : public Pass {
+  PassRunner* runner = nullptr;
+  Module* wasm = nullptr;
+
+  const std::string& profileExport;
+  uint64_t moduleHash;
+
+  Name counterGlobal;
+  std::vector<Name> functionGlobals;
+
+  Instrumenter(const std::string& profileExport, uint64_t moduleHash);
+
+  void run(PassRunner* runner, Module* wasm) override;
+  void addGlobals();
+  void instrumentFuncs();
+  void addProfileExport();
+};
+
+} // namespace wasm
+
+#endif // wasm_tools_wasm_split_instrumenter_h