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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 ExtVM.h
* @author Gav Wood <i@gavwood.com>
* @date 2014
*/
#pragma once
#include <map>
#include <functional>
#include <libethcore/CommonEth.h>
#include <libevm/ExtVMFace.h>
#include "State.h"
namespace dev
{
namespace eth
{
/**
* @brief Externality interface for the Virtual Machine providing access to world state.
*/
class ExtVM: public ExtVMFace
{
public:
/// Full constructor.
ExtVM(State& _s, Address _myAddress, Address _caller, Address _origin, u256 _value, u256 _gasPrice, bytesConstRef _data, bytesConstRef _code, Manifest* o_ms, unsigned _depth = 0):
ExtVMFace(_myAddress, _caller, _origin, _value, _gasPrice, _data, _code, _s.m_previousBlock, _s.m_currentBlock, _depth), m_s(_s), m_origCache(_s.m_cache), m_ms(o_ms)
{
m_s.ensureCached(_myAddress, true, true);
}
/// Read storage location.
u256 store(u256 _n) { return m_s.storage(myAddress, _n); }
/// Write a value in storage.
void setStore(u256 _n, u256 _v) { m_s.setStorage(myAddress, _n, _v); if (m_ms) m_ms->altered.push_back(_n); }
/// Read address's code.
bytes const& codeAt(Address _a) { return m_s.code(_a); }
/// Create a new contract.
h160 create(u256 _endowment, u256* _gas, bytesConstRef _code, OnOpFunc const& _onOp = OnOpFunc())
{
// Increment associated nonce for sender.
m_s.noteSending(myAddress);
if (m_ms)
m_ms->internal.resize(m_ms->internal.size() + 1);
auto ret = m_s.create(myAddress, _endowment, gasPrice, _gas, _code, origin, &suicides, m_ms ? &(m_ms->internal.back()) : nullptr, _onOp, depth + 1);
if (m_ms && !m_ms->internal.back().from)
m_ms->internal.pop_back();
return ret;
}
/// Create a new message call. Leave _myAddressOverride as the default to use the present address as caller.
bool call(Address _receiveAddress, u256 _txValue, bytesConstRef _txData, u256* _gas, bytesRef _out, OnOpFunc const& _onOp = OnOpFunc(), Address _myAddressOverride = Address(), Address _codeAddressOverride = Address())
{
if (m_ms)
m_ms->internal.resize(m_ms->internal.size() + 1);
auto ret = m_s.call(_receiveAddress, _codeAddressOverride ? _codeAddressOverride : _receiveAddress, _myAddressOverride ? _myAddressOverride : myAddress, _txValue, gasPrice, _txData, _gas, _out, origin, &suicides, m_ms ? &(m_ms->internal.back()) : nullptr, _onOp, depth + 1);
if (m_ms && !m_ms->internal.back().from)
m_ms->internal.pop_back();
return ret;
}
/// Read address's balance.
u256 balance(Address _a) { return m_s.balance(_a); }
/// Subtract amount from account's balance.
void subBalance(u256 _a) { m_s.subBalance(myAddress, _a); }
/// Determine account's TX count.
u256 txCount(Address _a) { return m_s.transactionsFrom(_a); }
/// Suicide the associated contract to the given address.
void suicide(Address _a)
{
m_s.addBalance(_a, m_s.balance(myAddress));
ExtVMFace::suicide(_a);
}
/// Revert any changes made (by any of the other calls).
/// @TODO check call site for the parent manifest being discarded.
void revert() { if (m_ms) *m_ms = Manifest(); m_s.m_cache = m_origCache; }
State& state() const { return m_s; }
private:
State& m_s; ///< A reference to the base state.
std::map<Address, AddressState> m_origCache; ///< The cache of the address states (i.e. the externalities) as-was prior to the execution.
Manifest* m_ms;
};
}
}