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diff --git a/libsolidity/ast/ASTVisitor.h b/libsolidity/ast/ASTVisitor.h
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+/*
+    This file is part of cpp-ethereum.
+
+    cpp-ethereum 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.
+
+    cpp-ethereum 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 cpp-ethereum.  If not, see <http://www.gnu.org/licenses/>.
+*/
+/**
+ * @author Christian <c@ethdev.com>
+ * @date 2014
+ * AST visitor base class.
+ */
+
+#pragma once
+
+#include <string>
+#include <functional>
+#include <vector>
+#include <libsolidity/ast/AST.h>
+
+namespace dev
+{
+namespace solidity
+{
+
+/**
+ * Visitor interface for the abstract syntax tree. This class is tightly bound to the
+ * implementation of @ref ASTNode::accept and its overrides. After a call to
+ * @ref ASTNode::accept, the function visit for the appropriate parameter is called and then
+ * (if it returns true) this continues recursively for all child nodes in document order
+ * (there is an exception for contracts). After all child nodes have been visited, endVisit is
+ * called for the node.
+ */
+class ASTVisitor
+{
+public:
+	virtual bool visit(SourceUnit& _node) { return visitNode(_node); }
+	virtual bool visit(ImportDirective& _node) { return visitNode(_node); }
+	virtual bool visit(ContractDefinition& _node) { return visitNode(_node); }
+	virtual bool visit(InheritanceSpecifier& _node) { return visitNode(_node); }
+	virtual bool visit(StructDefinition& _node) { return visitNode(_node); }
+	virtual bool visit(EnumDefinition& _node) { return visitNode(_node); }
+	virtual bool visit(EnumValue& _node) { return visitNode(_node); }
+	virtual bool visit(ParameterList& _node) { return visitNode(_node); }
+	virtual bool visit(FunctionDefinition& _node) { return visitNode(_node); }
+	virtual bool visit(VariableDeclaration& _node) { return visitNode(_node); }
+	virtual bool visit(ModifierDefinition& _node) { return visitNode(_node); }
+	virtual bool visit(ModifierInvocation& _node) { return visitNode(_node); }
+	virtual bool visit(EventDefinition& _node) { return visitNode(_node); }
+	virtual bool visit(TypeName& _node) { return visitNode(_node); }
+	virtual bool visit(ElementaryTypeName& _node) { return visitNode(_node); }
+	virtual bool visit(UserDefinedTypeName& _node) { return visitNode(_node); }
+	virtual bool visit(Mapping& _node) { return visitNode(_node); }
+	virtual bool visit(ArrayTypeName& _node) { return visitNode(_node); }
+	virtual bool visit(Block& _node) { return visitNode(_node); }
+	virtual bool visit(PlaceholderStatement& _node) { return visitNode(_node); }
+	virtual bool visit(IfStatement& _node) { return visitNode(_node); }
+	virtual bool visit(WhileStatement& _node) { return visitNode(_node); }
+	virtual bool visit(ForStatement& _node) { return visitNode(_node); }
+	virtual bool visit(Continue& _node) { return visitNode(_node); }
+	virtual bool visit(Break& _node) { return visitNode(_node); }
+	virtual bool visit(Return& _node) { return visitNode(_node); }
+	virtual bool visit(Throw& _node) { return visitNode(_node); }
+	virtual bool visit(VariableDeclarationStatement& _node) { return visitNode(_node); }
+	virtual bool visit(ExpressionStatement& _node) { return visitNode(_node); }
+	virtual bool visit(Assignment& _node) { return visitNode(_node); }
+	virtual bool visit(TupleExpression& _node) { return visitNode(_node); }
+	virtual bool visit(UnaryOperation& _node) { return visitNode(_node); }
+	virtual bool visit(BinaryOperation& _node) { return visitNode(_node); }
+	virtual bool visit(FunctionCall& _node) { return visitNode(_node); }
+	virtual bool visit(NewExpression& _node) { return visitNode(_node); }
+	virtual bool visit(MemberAccess& _node) { return visitNode(_node); }
+	virtual bool visit(IndexAccess& _node) { return visitNode(_node); }
+	virtual bool visit(Identifier& _node) { return visitNode(_node); }
+	virtual bool visit(ElementaryTypeNameExpression& _node) { return visitNode(_node); }
+	virtual bool visit(Literal& _node) { return visitNode(_node); }
+
+	virtual void endVisit(SourceUnit& _node) { endVisitNode(_node); }
+	virtual void endVisit(ImportDirective& _node) { endVisitNode(_node); }
+	virtual void endVisit(ContractDefinition& _node) { endVisitNode(_node); }
+	virtual void endVisit(InheritanceSpecifier& _node) { endVisitNode(_node); }
+	virtual void endVisit(StructDefinition& _node) { endVisitNode(_node); }
+	virtual void endVisit(EnumDefinition& _node) { endVisitNode(_node); }
+	virtual void endVisit(EnumValue& _node) { endVisitNode(_node); }
+	virtual void endVisit(ParameterList& _node) { endVisitNode(_node); }
+	virtual void endVisit(FunctionDefinition& _node) { endVisitNode(_node); }
+	virtual void endVisit(VariableDeclaration& _node) { endVisitNode(_node); }
+	virtual void endVisit(ModifierDefinition& _node) { endVisitNode(_node); }
+	virtual void endVisit(ModifierInvocation& _node) { endVisitNode(_node); }
+	virtual void endVisit(EventDefinition& _node) { endVisitNode(_node); }
+	virtual void endVisit(TypeName& _node) { endVisitNode(_node); }
+	virtual void endVisit(ElementaryTypeName& _node) { endVisitNode(_node); }
+	virtual void endVisit(UserDefinedTypeName& _node) { endVisitNode(_node); }
+	virtual void endVisit(Mapping& _node) { endVisitNode(_node); }
+	virtual void endVisit(ArrayTypeName& _node) { endVisitNode(_node); }
+	virtual void endVisit(Block& _node) { endVisitNode(_node); }
+	virtual void endVisit(PlaceholderStatement& _node) { endVisitNode(_node); }
+	virtual void endVisit(IfStatement& _node) { endVisitNode(_node); }
+	virtual void endVisit(WhileStatement& _node) { endVisitNode(_node); }
+	virtual void endVisit(ForStatement& _node) { endVisitNode(_node); }
+	virtual void endVisit(Continue& _node) { endVisitNode(_node); }
+	virtual void endVisit(Break& _node) { endVisitNode(_node); }
+	virtual void endVisit(Return& _node) { endVisitNode(_node); }
+	virtual void endVisit(Throw& _node) { endVisitNode(_node); }
+	virtual void endVisit(VariableDeclarationStatement& _node) { endVisitNode(_node); }
+	virtual void endVisit(ExpressionStatement& _node) { endVisitNode(_node); }
+	virtual void endVisit(Assignment& _node) { endVisitNode(_node); }
+	virtual void endVisit(TupleExpression& _node) { endVisitNode(_node); }
+	virtual void endVisit(UnaryOperation& _node) { endVisitNode(_node); }
+	virtual void endVisit(BinaryOperation& _node) { endVisitNode(_node); }
+	virtual void endVisit(FunctionCall& _node) { endVisitNode(_node); }
+	virtual void endVisit(NewExpression& _node) { endVisitNode(_node); }
+	virtual void endVisit(MemberAccess& _node) { endVisitNode(_node); }
+	virtual void endVisit(IndexAccess& _node) { endVisitNode(_node); }
+	virtual void endVisit(Identifier& _node) { endVisitNode(_node); }
+	virtual void endVisit(ElementaryTypeNameExpression& _node) { endVisitNode(_node); }
+	virtual void endVisit(Literal& _node) { endVisitNode(_node); }
+
+protected:
+	/// Generic function called by default for each node, to be overridden by derived classes
+	/// if behaviour unspecific to a node type is desired.
+	virtual bool visitNode(ASTNode&) { return true; }
+	/// Generic function called by default for each node, to be overridden by derived classes
+	/// if behaviour unspecific to a node type is desired.
+	virtual void endVisitNode(ASTNode&) { }
+};
+
+class ASTConstVisitor
+{
+public:
+	virtual bool visit(SourceUnit const& _node) { return visitNode(_node); }
+	virtual bool visit(ImportDirective const& _node) { return visitNode(_node); }
+	virtual bool visit(ContractDefinition const& _node) { return visitNode(_node); }
+	virtual bool visit(InheritanceSpecifier const& _node) { return visitNode(_node); }
+	virtual bool visit(StructDefinition const& _node) { return visitNode(_node); }
+	virtual bool visit(EnumDefinition const& _node) { return visitNode(_node); }
+	virtual bool visit(EnumValue const& _node) { return visitNode(_node); }
+	virtual bool visit(ParameterList const& _node) { return visitNode(_node); }
+	virtual bool visit(FunctionDefinition const& _node) { return visitNode(_node); }
+	virtual bool visit(VariableDeclaration const& _node) { return visitNode(_node); }
+	virtual bool visit(ModifierDefinition const& _node) { return visitNode(_node); }
+	virtual bool visit(ModifierInvocation const& _node) { return visitNode(_node); }
+	virtual bool visit(EventDefinition const& _node) { return visitNode(_node); }
+	virtual bool visit(TypeName const& _node) { return visitNode(_node); }
+	virtual bool visit(ElementaryTypeName const& _node) { return visitNode(_node); }
+	virtual bool visit(UserDefinedTypeName const& _node) { return visitNode(_node); }
+	virtual bool visit(Mapping const& _node) { return visitNode(_node); }
+	virtual bool visit(ArrayTypeName const& _node) { return visitNode(_node); }
+	virtual bool visit(Block const& _node) { return visitNode(_node); }
+	virtual bool visit(PlaceholderStatement const& _node) { return visitNode(_node); }
+	virtual bool visit(IfStatement const& _node) { return visitNode(_node); }
+	virtual bool visit(WhileStatement const& _node) { return visitNode(_node); }
+	virtual bool visit(ForStatement const& _node) { return visitNode(_node); }
+	virtual bool visit(Continue const& _node) { return visitNode(_node); }
+	virtual bool visit(Break const& _node) { return visitNode(_node); }
+	virtual bool visit(Return const& _node) { return visitNode(_node); }
+	virtual bool visit(Throw const& _node) { return visitNode(_node); }
+	virtual bool visit(VariableDeclarationStatement const& _node) { return visitNode(_node); }
+	virtual bool visit(ExpressionStatement const& _node) { return visitNode(_node); }
+	virtual bool visit(Assignment const& _node) { return visitNode(_node); }
+	virtual bool visit(TupleExpression const& _node) { return visitNode(_node); }
+	virtual bool visit(UnaryOperation const& _node) { return visitNode(_node); }
+	virtual bool visit(BinaryOperation const& _node) { return visitNode(_node); }
+	virtual bool visit(FunctionCall const& _node) { return visitNode(_node); }
+	virtual bool visit(NewExpression const& _node) { return visitNode(_node); }
+	virtual bool visit(MemberAccess const& _node) { return visitNode(_node); }
+	virtual bool visit(IndexAccess const& _node) { return visitNode(_node); }
+	virtual bool visit(Identifier const& _node) { return visitNode(_node); }
+	virtual bool visit(ElementaryTypeNameExpression const& _node) { return visitNode(_node); }
+	virtual bool visit(Literal const& _node) { return visitNode(_node); }
+
+	virtual void endVisit(SourceUnit const& _node) { endVisitNode(_node); }
+	virtual void endVisit(ImportDirective const& _node) { endVisitNode(_node); }
+	virtual void endVisit(ContractDefinition const& _node) { endVisitNode(_node); }
+	virtual void endVisit(InheritanceSpecifier const& _node) { endVisitNode(_node); }
+	virtual void endVisit(StructDefinition const& _node) { endVisitNode(_node); }
+	virtual void endVisit(EnumDefinition const& _node) { endVisitNode(_node); }
+	virtual void endVisit(EnumValue const& _node) { endVisitNode(_node); }
+	virtual void endVisit(ParameterList const& _node) { endVisitNode(_node); }
+	virtual void endVisit(FunctionDefinition const& _node) { endVisitNode(_node); }
+	virtual void endVisit(VariableDeclaration const& _node) { endVisitNode(_node); }
+	virtual void endVisit(ModifierDefinition const& _node) { endVisitNode(_node); }
+	virtual void endVisit(ModifierInvocation const& _node) { endVisitNode(_node); }
+	virtual void endVisit(EventDefinition const& _node) { endVisitNode(_node); }
+	virtual void endVisit(TypeName const& _node) { endVisitNode(_node); }
+	virtual void endVisit(ElementaryTypeName const& _node) { endVisitNode(_node); }
+	virtual void endVisit(UserDefinedTypeName const& _node) { endVisitNode(_node); }
+	virtual void endVisit(Mapping const& _node) { endVisitNode(_node); }
+	virtual void endVisit(ArrayTypeName const& _node) { endVisitNode(_node); }
+	virtual void endVisit(Block const& _node) { endVisitNode(_node); }
+	virtual void endVisit(PlaceholderStatement const& _node) { endVisitNode(_node); }
+	virtual void endVisit(IfStatement const& _node) { endVisitNode(_node); }
+	virtual void endVisit(WhileStatement const& _node) { endVisitNode(_node); }
+	virtual void endVisit(ForStatement const& _node) { endVisitNode(_node); }
+	virtual void endVisit(Continue const& _node) { endVisitNode(_node); }
+	virtual void endVisit(Break const& _node) { endVisitNode(_node); }
+	virtual void endVisit(Return const& _node) { endVisitNode(_node); }
+	virtual void endVisit(Throw const& _node) { endVisitNode(_node); }
+	virtual void endVisit(VariableDeclarationStatement const& _node) { endVisitNode(_node); }
+	virtual void endVisit(ExpressionStatement const& _node) { endVisitNode(_node); }
+	virtual void endVisit(Assignment const& _node) { endVisitNode(_node); }
+	virtual void endVisit(TupleExpression const& _node) { endVisitNode(_node); }
+	virtual void endVisit(UnaryOperation const& _node) { endVisitNode(_node); }
+	virtual void endVisit(BinaryOperation const& _node) { endVisitNode(_node); }
+	virtual void endVisit(FunctionCall const& _node) { endVisitNode(_node); }
+	virtual void endVisit(NewExpression const& _node) { endVisitNode(_node); }
+	virtual void endVisit(MemberAccess const& _node) { endVisitNode(_node); }
+	virtual void endVisit(IndexAccess const& _node) { endVisitNode(_node); }
+	virtual void endVisit(Identifier const& _node) { endVisitNode(_node); }
+	virtual void endVisit(ElementaryTypeNameExpression const& _node) { endVisitNode(_node); }
+	virtual void endVisit(Literal const& _node) { endVisitNode(_node); }
+
+protected:
+	/// Generic function called by default for each node, to be overridden by derived classes
+	/// if behaviour unspecific to a node type is desired.
+	virtual bool visitNode(ASTNode const&) { return true; }
+	/// Generic function called by default for each node, to be overridden by derived classes
+	/// if behaviour unspecific to a node type is desired.
+	virtual void endVisitNode(ASTNode const&) { }
+};
+
+/**
+ * Utility class that accepts std::functions and calls them for visitNode and endVisitNode.
+ */
+class SimpleASTVisitor: public ASTConstVisitor
+{
+public:
+	SimpleASTVisitor(
+		std::function<bool(ASTNode const&)> _onVisit,
+		std::function<void(ASTNode const&)> _onEndVisit
+	): m_onVisit(_onVisit), m_onEndVisit(_onEndVisit) {}
+
+protected:
+	virtual bool visitNode(ASTNode const& _n) override { return m_onVisit ? m_onVisit(_n) : true; }
+	virtual void endVisitNode(ASTNode const& _n) override { m_onEndVisit(_n); }
+
+private:
+	std::function<bool(ASTNode const&)> m_onVisit;
+	std::function<void(ASTNode const&)> m_onEndVisit;
+};
+
+/**
+ * Utility class that visits the AST in depth-first order and calls a function on each node and each edge.
+ * Child nodes are only visited if the node callback of the parent returns true.
+ * The node callback of a parent is called before any edge or node callback involving the children.
+ * The edge callbacks of all children are called before the edge callback of the parent.
+ * This way, the node callback can be used as an initializing callback and the edge callbacks can be
+ * used to compute a "reduce" function.
+ */
+class ASTReduce: public ASTConstVisitor
+{
+public:
+	/**
+	 * Constructs a new ASTReduce object with the given callback functions.
+	 * @param _onNode called for each node, before its child edges and nodes, should return true to descend deeper
+	 * @param _onEdge called for each edge with (parent, child)
+	 */
+	ASTReduce(
+		std::function<bool(ASTNode const&)> _onNode,
+		std::function<void(ASTNode const&, ASTNode const&)> _onEdge
+	): m_onNode(_onNode), m_onEdge(_onEdge)
+	{
+	}
+
+protected:
+	bool visitNode(ASTNode const& _node) override
+	{
+		m_parents.push_back(&_node);
+		return m_onNode(_node);
+	}
+	void endVisitNode(ASTNode const& _node) override
+	{
+		m_parents.pop_back();
+		if (!m_parents.empty())
+			m_onEdge(*m_parents.back(), _node);
+	}
+
+private:
+	std::vector<ASTNode const*> m_parents;
+	std::function<bool(ASTNode const&)> m_onNode;
+	std::function<void(ASTNode const&, ASTNode const&)> m_onEdge;
+};
+
+}
+}