/* 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 . */ /** @file VM.h * @author Gav Wood * @date 2014 */ #pragma once #include #include #include #include #include #include #include #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(u256& io_gas, ExtVMFace& _ext, OnOpFunc const& _onOp = {}, uint64_t _steps = (uint64_t)-1) override final; u256 curPC() const { return m_curPC; } bytes const& memory() const { return m_temp; } u256s const& stack() const { return m_stack; } private: 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 m_curPC = 0; bytes m_temp; u256s m_stack; std::vector m_jumpDests; std::function m_onFail; }; } }