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diff --git a/third_party/wasm2c/include/wabt/ir-util.h b/third_party/wasm2c/include/wabt/ir-util.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_IR_UTIL_H_
+#define WABT_IR_UTIL_H_
+
+#include "wabt/common.h"
+#include "wabt/ir.h"
+
+namespace wabt {
+
+struct Label {
+ Label(LabelType label_type,
+ const std::string& name,
+ const TypeVector& param_types,
+ const TypeVector& result_types)
+ : name(name),
+ label_type(label_type),
+ param_types(param_types),
+ result_types(result_types) {}
+
+ std::string name;
+ LabelType label_type;
+ TypeVector param_types;
+ TypeVector result_types;
+};
+
+struct ModuleContext {
+ ModuleContext(const Module& module) : module(module) {}
+
+ Index GetLabelStackSize() const { return label_stack_.size(); }
+ const Label* GetLabel(const Var& var) const;
+ Index GetLabelArity(const Var& var) const;
+ void SetTopLabelType(LabelType label_type) {
+ label_stack_.back().label_type = label_type;
+ }
+
+ Index GetFuncParamCount(const Var& var) const;
+ Index GetFuncResultCount(const Var& var) const;
+
+ void BeginBlock(LabelType label_type, const Block& block);
+ void EndBlock();
+ void BeginFunc(const Func& func);
+ void EndFunc();
+
+ struct Arities {
+ Index nargs;
+ Index nreturns;
+ bool unreachable;
+ Arities(Index na, Index nr, bool ur = false)
+ : nargs(na), nreturns(nr), unreachable(ur) {}
+ };
+ Arities GetExprArity(const Expr& expr) const;
+
+ const Module& module;
+
+ private:
+ const Func* current_func_ = nullptr;
+ std::vector<Label> label_stack_;
+};
+
+} // namespace wabt
+
+#endif /* WABT_IR_UTIL_H_ */