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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 VM.h
* @author Gav Wood <i@gavwood.com>
* @date 2014
*/
#pragma once
#include <unordered_map>
#include <libdevcore/Exceptions.h>
#include <libethcore/Common.h>
#include <libevmcore/Instruction.h>
#include <libdevcore/SHA3.h>
#include <libethcore/BlockInfo.h>
#include <libevmcore/Params.h>
#include "VMFace.h"
namespace dev
{
namespace eth
{
// Convert from a 256-bit integer stack/memory entry into a 160-bit Address hash.
// Currently we just pull out the right (low-order in BE) 160-bits.
inline Address asAddress(u256 _item)
{
return right160(h256(_item));
}
inline u256 fromAddress(Address _a)
{
return (u160)_a;
}
/**
*/
class VM: public VMFace
{
public:
virtual bytesConstRef go(ExtVMFace& _ext, OnOpFunc const& _onOp = {}, uint64_t _steps = (uint64_t)-1) override final;
void require(u256 _n, u256 _d) { if (m_stack.size() < _n) { if (m_onFail) m_onFail(); BOOST_THROW_EXCEPTION(StackUnderflow() << RequirementError((bigint)_n, (bigint)m_stack.size())); } if (m_stack.size() - _n + _d > c_stackLimit) { if (m_onFail) m_onFail(); BOOST_THROW_EXCEPTION(OutOfStack() << RequirementError((bigint)(_d - _n), (bigint)m_stack.size())); } }
void requireMem(unsigned _n) { if (m_temp.size() < _n) { m_temp.resize(_n); } }
u256 curPC() const { return m_curPC; }
bytes const& memory() const { return m_temp; }
u256s const& stack() const { return m_stack; }
void reset(u256 const& _gas = 0) noexcept override;
u256 gas() const noexcept override { return (u256)m_gas; }
private:
friend class VMFactory;
/// Construct VM object.
explicit VM(u256 _gas): m_gas(_gas) {}
u256 m_curPC = 0;
bytes m_temp;
u256s m_stack;
std::set<u256> m_jumpDests;
std::function<void()> m_onFail;
bigint m_gas = 0;
};
}
}