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81 lines
2.3 KiB
81 lines
2.3 KiB
/*
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This file is part of cpp-ethereum.
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cpp-ethereum is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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cpp-ethereum is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with cpp-ethereum. If not, see <http://www.gnu.org/licenses/>.
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*/
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/** @file VM.h
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* @author Gav Wood <i@gavwood.com>
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* @date 2014
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*/
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#pragma once
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#include <unordered_map>
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#include <libdevcore/Exceptions.h>
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#include <libethcore/Common.h>
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#include <libevmcore/Instruction.h>
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#include <libdevcrypto/SHA3.h>
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#include <libethcore/BlockInfo.h>
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#include <libevmcore/Params.h>
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#include "VMFace.h"
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namespace dev
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{
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namespace eth
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{
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// Convert from a 256-bit integer stack/memory entry into a 160-bit Address hash.
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// Currently we just pull out the right (low-order in BE) 160-bits.
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inline Address asAddress(u256 _item)
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{
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return right160(h256(_item));
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}
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inline u256 fromAddress(Address _a)
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{
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return (u160)_a;
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}
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/**
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*/
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class VM: public VMFace
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{
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public:
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virtual void reset(u256 _gas = 0) noexcept override final;
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virtual bytesConstRef go(ExtVMFace& _ext, OnOpFunc const& _onOp = {}, uint64_t _steps = (uint64_t)-1) override final;
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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())); } }
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void requireMem(unsigned _n) { if (m_temp.size() < _n) { m_temp.resize(_n); } }
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u256 curPC() const { return m_curPC; }
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bytes const& memory() const { return m_temp; }
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u256s const& stack() const { return m_stack; }
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private:
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friend class VMFactory;
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/// Construct VM object.
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explicit VM(u256 _gas): VMFace(_gas) {}
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u256 m_curPC = 0;
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bytes m_temp;
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u256s m_stack;
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std::set<u256> m_jumpDests;
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std::function<void()> m_onFail;
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};
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}
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}
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