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diff --git a/src/tools/wasm-split/split-options.h b/src/tools/wasm-split/split-options.h
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+++ b/src/tools/wasm-split/split-options.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_options_h
+#define wasm_tools_wasm_split_options_h
+
+#include "tools/tool-options.h"
+
+namespace wasm {
+
+const std::string DEFAULT_PROFILE_EXPORT("__write_profile");
+
+struct WasmSplitOptions : ToolOptions {
+  enum class Mode : unsigned {
+    Split,
+    Instrument,
+    MergeProfiles,
+  };
+  Mode mode = Mode::Split;
+  constexpr static size_t NumModes =
+    static_cast<unsigned>(Mode::MergeProfiles) + 1;
+
+  bool verbose = false;
+  bool emitBinary = true;
+  bool symbolMap = false;
+  bool placeholderMap = false;
+
+  // TODO: Remove this. See the comment in wasm-binary.h.
+  bool emitModuleNames = false;
+
+  std::string profileFile;
+  std::string profileExport = DEFAULT_PROFILE_EXPORT;
+
+  std::set<Name> keepFuncs;
+  std::set<Name> splitFuncs;
+
+  std::vector<std::string> inputFiles;
+  std::string output;
+  std::string primaryOutput;
+  std::string secondaryOutput;
+
+  std::string importNamespace;
+  std::string placeholderNamespace;
+  std::string exportPrefix;
+
+  // A hack to ensure the split and instrumented modules have the same table
+  // size when using Emscripten's SPLIT_MODULE mode with dynamic linking. TODO:
+  // Figure out a more elegant solution for that use case and remove this.
+  int initialTableSize = -1;
+
+  // The options that are valid for each mode.
+  std::array<std::unordered_set<std::string>, NumModes> validOptions;
+  std::vector<std::string> usedOptions;
+
+  WasmSplitOptions();
+  WasmSplitOptions& add(const std::string& longName,
+                        const std::string& shortName,
+                        const std::string& description,
+                        std::vector<Mode>&& modes,
+                        Arguments arguments,
+                        const Action& action);
+  WasmSplitOptions& add(const std::string& longName,
+                        const std::string& shortName,
+                        const std::string& description,
+                        Arguments arguments,
+                        const Action& action);
+  bool validate();
+  void parse(int argc, const char* argv[]);
+};
+
+} // namespace wasm
+
+#endif // wasm_tools_wasm_split_h