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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/>.
*/
/** @file CodeFragment.h
* @author Gav Wood <i@gavwood.com>
* @date 2014
*/
#pragma once
#include <iostream>
#include <libethsupport/Common.h>
#include <libethcore/Instruction.h>
#include "Exceptions.h"
namespace eth
{
enum AssemblyItemType { Operation, Push, PushString, PushTag, Tag, PushData };
class Assembly;
class AssemblyItem
{
friend class Assembly;
public:
AssemblyItem(u256 _push): m_type(Push), m_data(_push) {}
AssemblyItem(AssemblyItemType _type, AssemblyItem const& _tag): m_type(_type), m_data(_tag.m_data) { assert(_type == PushTag); assert(_tag.m_type == Tag); }
AssemblyItem(Instruction _i): m_type(Operation), m_data((byte)_i) {}
AssemblyItem(AssemblyItemType _type, u256 _data): m_type(_type), m_data(_data) {}
AssemblyItemType type() const { return m_type; }
u256 data() const { return m_data; }
std::ostream& streamOut(std::ostream& _out) const;
private:
AssemblyItemType m_type;
u256 m_data;
};
class Assembly
{
public:
AssemblyItem newTag() { return AssemblyItem(Tag, m_usedTags++); }
AssemblyItem newData(bytes const& _data) { auto h = sha3(_data); m_data[h] = _data; return AssemblyItem(PushData, h); }
AssemblyItem newPushString(std::string const& _data) { auto b = asBytes(_data); auto h = sha3(b); m_data[h] = b; return AssemblyItem(PushString, h); }
void append(AssemblyItem const& _i) { m_items.push_back(_i); }
bytes assemble() const;
void append(Assembly const& _a);
std::ostream& streamOut(std::ostream& _out) const;
private:
u256 m_usedTags = 0;
std::vector<AssemblyItem> m_items;
std::map<h256, bytes> m_data;
};
}
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