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diff --git a/libsolidity/analysis/ContractLevelChecker.h b/libsolidity/analysis/ContractLevelChecker.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/>.
+*/
+/**
+ * Component that verifies overloads, abstract contracts, function clashes and others
+ * checks at contract or function level.
+ */
+
+#pragma once
+
+#include <libsolidity/ast/ASTForward.h>
+
+#include <map>
+
+namespace langutil
+{
+class ErrorReporter;
+}
+
+namespace dev
+{
+namespace solidity
+{
+
+/**
+ * Component that verifies overloads, abstract contracts, function clashes and others
+ * checks at contract or function level.
+ */
+class ContractLevelChecker
+{
+public:
+	/// @param _errorReporter provides the error logging functionality.
+	explicit ContractLevelChecker(langutil::ErrorReporter& _errorReporter):
+		m_errorReporter(_errorReporter)
+	{}
+
+	/// Performs checks on the given contract.
+	/// @returns true iff all checks passed. Note even if all checks passed, errors() can still contain warnings
+	bool check(ContractDefinition const& _contract);
+
+private:
+	/// Checks that two functions defined in this contract with the same name have different
+	/// arguments and that there is at most one constructor.
+	void checkDuplicateFunctions(ContractDefinition const& _contract);
+	void checkDuplicateEvents(ContractDefinition const& _contract);
+	template <class T>
+	void findDuplicateDefinitions(std::map<std::string, std::vector<T>> const& _definitions, std::string _message);
+	void checkIllegalOverrides(ContractDefinition const& _contract);
+	/// Reports a type error with an appropriate message if overridden function signature differs.
+	/// Also stores the direct super function in the AST annotations.
+	void checkFunctionOverride(FunctionDefinition const& function, FunctionDefinition const& super);
+	void overrideError(FunctionDefinition const& function, FunctionDefinition const& super, std::string message);
+	void checkAbstractFunctions(ContractDefinition const& _contract);
+	void checkBaseConstructorArguments(ContractDefinition const& _contract);
+	void annotateBaseConstructorArguments(
+		ContractDefinition const& _currentContract,
+		FunctionDefinition const* _baseConstructor,
+		ASTNode const* _argumentNode
+	);
+	void checkConstructor(ContractDefinition const& _contract);
+	void checkFallbackFunction(ContractDefinition const& _contract);
+	/// Checks that different functions with external visibility end up having different
+	/// external argument types (i.e. different signature).
+	void checkExternalTypeClashes(ContractDefinition const& _contract);
+	/// Checks for hash collisions in external function signatures.
+	void checkHashCollisions(ContractDefinition const& _contract);
+	/// Checks that all requirements for a library are fulfilled if this is a library.
+	void checkLibraryRequirements(ContractDefinition const& _contract);
+
+	langutil::ErrorReporter& m_errorReporter;
+};
+
+}
+}