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diff --git a/libyul/optimiser/ExpressionInliner.h b/libyul/optimiser/ExpressionInliner.h
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+/*
+	This file is part of solidity.
+
+	solidity is free software: you can redistribute it and/or modify
+	it under the terms of the GNU General Public License as published by
+	the Free Software Foundation, either version 3 of the License, or
+	(at your option) any later version.
+
+	solidity is distributed in the hope that it will be useful,
+	but WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+	GNU General Public License for more details.
+
+	You should have received a copy of the GNU General Public License
+	along with solidity.  If not, see <http://www.gnu.org/licenses/>.
+*/
+/**
+ * Optimiser component that performs function inlining.
+ */
+#pragma once
+
+#include <libyul/optimiser/ASTWalker.h>
+
+#include <libyul/ASTDataForward.h>
+
+#include <boost/variant.hpp>
+#include <boost/optional.hpp>
+
+#include <set>
+
+namespace dev
+{
+namespace yul
+{
+
+/**
+ * Optimiser component that modifies an AST in place, inlining functions that can be
+ * inlined inside functional expressions, i.e. functions that
+ *  - return a single value
+ *  - have a body like r := <functional expression>
+ *  - neither reference themselves nor r in the right hand side
+ *
+ * Furthermore, the arguments of the function call cannot have any side-effects.
+ *
+ * This component can only be used on sources with unique names.
+ */
+class ExpressionInliner: public ASTModifier
+{
+public:
+	ExpressionInliner(Block& _block):
+		m_block(_block)
+	{}
+
+	void run();
+
+	using ASTModifier::operator();
+	virtual void operator()(FunctionDefinition& _fun) override;
+
+	virtual void visit(Expression& _expression) override;
+
+private:
+	std::map<std::string, FunctionDefinition const*> m_inlinableFunctions;
+	std::map<std::string, std::string> m_varReplacements;
+	/// Set of functions we are currently visiting inside.
+	std::set<std::string> m_currentFunctions;
+
+	Block& m_block;
+};
+
+
+}
+}