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100 lines
3.4 KiB
100 lines
3.4 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 ExtVM.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 <map>
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#include <functional>
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#include <libethcore/Common.h>
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#include <libevm/ExtVMFace.h>
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#include "State.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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/**
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* @brief Externality interface for the Virtual Machine providing access to world state.
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*/
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class ExtVM: public ExtVMFace
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{
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public:
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/// Full constructor.
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ExtVM(State& _s, LastHashes const& _lh, Address _myAddress, Address _caller, Address _origin, u256 _value, u256 _gasPrice, bytesConstRef _data, bytesConstRef _code, unsigned _depth = 0):
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ExtVMFace(_myAddress, _caller, _origin, _value, _gasPrice, _data, _code.toBytes(), _s.m_previousBlock, _s.m_currentBlock, _lh, _depth), m_s(_s), m_origCache(_s.m_cache)
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{
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m_s.ensureCached(_myAddress, true, true);
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}
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/// Read storage location.
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virtual u256 store(u256 _n) override final { return m_s.storage(myAddress, _n); }
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/// Write a value in storage.
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virtual void setStore(u256 _n, u256 _v) override final { m_s.setStorage(myAddress, _n, _v); }
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/// Read address's code.
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virtual bytes const& codeAt(Address _a) override final { return m_s.code(_a); }
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/// Create a new contract.
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virtual h160 create(u256 _endowment, u256& io_gas, bytesConstRef _code, OnOpFunc const& _onOp = {}) override final;
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/// Create a new message call. Leave _myAddressOverride as the default to use the present address as caller.
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virtual bool call(Address _receiveAddress, u256 _txValue, bytesConstRef _txData, u256& io_gas, bytesRef _out, OnOpFunc const& _onOp = {}, Address _myAddressOverride = {}, Address _codeAddressOverride = {}) override final;
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/// Read address's balance.
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virtual u256 balance(Address _a) override final { return m_s.balance(_a); }
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/// Subtract amount from account's balance.
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virtual void subBalance(u256 _a) override final { m_s.subBalance(myAddress, _a); }
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/// Determine account's TX count.
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virtual u256 txCount(Address _a) override final { return m_s.transactionsFrom(_a); }
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/// Does the account exist?
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virtual bool exists(Address _a) override final { return m_s.addressInUse(_a); }
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/// Suicide the associated contract to the given address.
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virtual void suicide(Address _a) override final
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{
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m_s.addBalance(_a, m_s.balance(myAddress));
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m_s.subBalance(myAddress, m_s.balance(myAddress));
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ExtVMFace::suicide(_a);
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}
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/// Revert any changes made (by any of the other calls).
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/// @TODO check call site for the parent manifest being discarded.
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virtual void revert() override final
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{
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m_s.m_cache = m_origCache;
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sub.clear();
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}
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State& state() const { return m_s; }
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private:
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State& m_s; ///< A reference to the base state.
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std::unordered_map<Address, Account> m_origCache; ///< The cache of the address states (i.e. the externalities) as-was prior to the execution.
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};
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}
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}
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