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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
+ * Utilities for the solidity compiler.
+ */
+
+#pragma once
+
+#include <libevmface/Instruction.h>
+#include <liblll/Assembly.h>
+#include <libsolidity/Types.h>
+
+namespace dev {
+namespace solidity {
+
+
+/**
+ * Context to be shared by all units that compile the same contract.
+ * It stores the generated bytecode and the position of identifiers in memory and on the stack.
+ */
+class CompilerContext
+{
+public:
+	CompilerContext() {}
+
+	void startNewFunction() { m_localVariables.clear(); m_asm.setDeposit(0); }
+	void initializeLocalVariables(unsigned _numVariables);
+	void addVariable(VariableDeclaration const& _declaration) { m_localVariables.push_back(&_declaration); }
+	/// Returns the distance of the given local variable from the top of the stack.
+	int getStackPositionOfVariable(Declaration const& _declaration);
+
+	void addFunction(FunctionDefinition const& _function) { m_functionEntryLabels.insert(std::make_pair(&_function, m_asm.newTag())); }
+	eth::AssemblyItem getFunctionEntryLabel(FunctionDefinition const& _function) const;
+
+	void adjustStackOffset(int _adjustment) { m_asm.adjustDeposit(_adjustment); }
+
+	/// Appends a JUMPI instruction to a new tag and @returns the tag
+	eth::AssemblyItem appendConditionalJump() { return m_asm.appendJumpI().tag(); }
+	/// Appends a JUMPI instruction to @a _tag
+	CompilerContext& appendConditionalJumpTo(eth::AssemblyItem const& _tag) { m_asm.appendJumpI(_tag); return *this; }
+	/// Appends a JUMP to a new tag and @returns the tag
+	eth::AssemblyItem appendJump() { return m_asm.appendJump().tag(); }
+	/// Appends a JUMP to a specific tag
+	CompilerContext& appendJumpTo(eth::AssemblyItem const& _tag) { m_asm.appendJump(_tag); return *this; }
+	/// Appends pushing of a new tag and @returns the new tag.
+	eth::AssemblyItem pushNewTag() { return m_asm.append(m_asm.newPushTag()).tag(); }
+	/// @returns a new tag without pushing any opcodes or data
+	eth::AssemblyItem newTag() { return m_asm.newTag(); }
+
+	/// Append elements to the current instruction list and adjust @a m_stackOffset.
+	CompilerContext& operator<<(eth::AssemblyItem const& _item) { m_asm.append(_item); return *this; }
+	CompilerContext& operator<<(eth::Instruction _instruction) { m_asm.append(_instruction); return *this; }
+	CompilerContext& operator<<(u256 const& _value) { m_asm.append(_value); return *this; }
+	CompilerContext& operator<<(bytes const& _data) { m_asm.append(_data); return *this; }
+
+	bytes getAssembledBytecode() { return m_asm.assemble(); }
+private:
+	eth::Assembly m_asm;
+
+	/// Offsets of local variables on the stack.
+	std::vector<Declaration const*> m_localVariables;
+	/// Labels pointing to the entry points of funcitons.
+	std::map<FunctionDefinition const*, eth::AssemblyItem> m_functionEntryLabels;
+};
+
+}
+}