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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 Executive.cpp
* @author Gav Wood <i@gavwood.com>
* @date 2014
*/
#include <boost/timer.hpp>
#include <libdevcore/CommonIO.h>
#include <libevm/VM.h>
#include "Executive.h"
#include "State.h"
#include "ExtVM.h"
using namespace std;
using namespace dev;
using namespace dev::eth;
#define ETH_VMTRACE 1
Executive::~Executive()
{
// TODO: Make safe.
delete m_ext;
delete m_vm;
}
u256 Executive::gasUsed() const
{
return m_t.gas() - m_endGas;
}
bool Executive::setup(bytesConstRef _rlp)
{
// Entry point for a user-executed transaction.
m_t = Transaction(_rlp);
m_sender = m_t.sender();
// Avoid invalid transactions.
auto nonceReq = m_s.transactionsFrom(m_sender);
if (m_t.nonce() != nonceReq)
{
clog(StateDetail) << "Invalid Nonce: Require" << nonceReq << " Got" << m_t.nonce();
BOOST_THROW_EXCEPTION(InvalidNonce(nonceReq, m_t.nonce()));
}
// Don't like transactions whose gas price is too low. NOTE: this won't stay here forever - it's just until we get a proper gas price discovery protocol going.
if (m_t.gasPrice() < m_s.m_currentBlock.minGasPrice)
{
clog(StateDetail) << "Offered gas-price is too low: Require >" << m_s.m_currentBlock.minGasPrice << " Got" << m_t.gasPrice();
BOOST_THROW_EXCEPTION(GasPriceTooLow());
}
// Check gas cost is enough.
u256 gasCost = m_t.data().size() * c_txDataGas + c_txGas;
if (m_t.gas() < gasCost)
{
clog(StateDetail) << "Not enough gas to pay for the transaction: Require >" << gasCost << " Got" << m_t.gas();
BOOST_THROW_EXCEPTION(OutOfGas());
}
u256 cost = m_t.value() + m_t.gas() * m_t.gasPrice();
// Avoid unaffordable transactions.
if (m_s.balance(m_sender) < cost)
{
clog(StateDetail) << "Not enough cash: Require >" << cost << " Got" << m_s.balance(m_sender);
BOOST_THROW_EXCEPTION(NotEnoughCash() << RequirementError((int)cost, (int)m_s.balance(m_sender)));
}
u256 startGasUsed = m_s.gasUsed();
if (startGasUsed + m_t.gas() > m_s.m_currentBlock.gasLimit)
{
clog(StateDetail) << "Too much gas used in this block: Require <" << (m_s.m_currentBlock.gasLimit - startGasUsed) << " Got" << m_t.gas();
BOOST_THROW_EXCEPTION(BlockGasLimitReached() << RequirementError((int)(m_s.m_currentBlock.gasLimit - startGasUsed), (int)m_t.gas()));
}
// Increment associated nonce for sender.
m_s.noteSending(m_sender);
// Pay...
clog(StateDetail) << "Paying" << formatBalance(cost) << "from sender (includes" << m_t.gas() << "gas at" << formatBalance(m_t.gasPrice()) << ")";
m_s.subBalance(m_sender, cost);
if (m_ms)
{
m_ms->from = m_sender;
m_ms->to = m_t.receiveAddress();
m_ms->value = m_t.value();
m_ms->input = m_t.data();
}
if (m_t.isCreation())
return create(m_sender, m_t.value(), m_t.gasPrice(), m_t.gas() - gasCost, &m_t.data(), m_sender);
else
return call(m_t.receiveAddress(), m_sender, m_t.value(), m_t.gasPrice(), bytesConstRef(&m_t.data()), m_t.gas() - gasCost, m_sender);
}
bool Executive::call(Address _receiveAddress, Address _senderAddress, u256 _value, u256 _gasPrice, bytesConstRef _data, u256 _gas, Address _originAddress)
{
// cnote << "Transferring" << formatBalance(_value) << "to receiver.";
m_s.addBalance(_receiveAddress, _value);
if (m_s.addressHasCode(_receiveAddress))
{
m_vm = new VM(_gas);
bytes const& c = m_s.code(_receiveAddress);
m_ext = new ExtVM(m_s, _receiveAddress, _senderAddress, _originAddress, _value, _gasPrice, _data, &c, m_ms);
}
else
m_endGas = _gas;
return !m_ext;
}
bool Executive::create(Address _sender, u256 _endowment, u256 _gasPrice, u256 _gas, bytesConstRef _init, Address _origin)
{
// We can allow for the reverted state (i.e. that with which m_ext is constructed) to contain the m_newAddress, since
// we delete it explicitly if we decide we need to revert.
m_newAddress = right160(sha3(rlpList(_sender, m_s.transactionsFrom(_sender) - 1)));
// Set up new account...
m_s.m_cache[m_newAddress] = Account(m_s.balance(m_newAddress) + _endowment, Account::ContractConception);
// Execute _init.
m_vm = new VM(_gas);
m_ext = new ExtVM(m_s, m_newAddress, _sender, _origin, _endowment, _gasPrice, bytesConstRef(), _init, m_ms);
return _init.empty();
}
OnOpFunc Executive::simpleTrace()
{
return [](uint64_t steps, Instruction inst, bigint newMemSize, bigint gasCost, void* voidVM, void const* voidExt)
{
ExtVM const& ext = *(ExtVM const*)voidExt;
VM& vm = *(VM*)voidVM;
ostringstream o;
o << endl << " STACK" << endl;
for (auto i: vm.stack())
o << (h256)i << endl;
o << " MEMORY" << endl << memDump(vm.memory());
o << " STORAGE" << endl;
for (auto const& i: ext.state().storage(ext.myAddress))
o << showbase << hex << i.first << ": " << i.second << endl;
dev::LogOutputStream<VMTraceChannel, false>(true) << o.str();
dev::LogOutputStream<VMTraceChannel, false>(false) << " | " << dec << ext.depth << " | " << ext.myAddress << " | #" << steps << " | " << hex << setw(4) << setfill('0') << vm.curPC() << " : " << instructionInfo(inst).name << " | " << dec << vm.gas() << " | -" << dec << gasCost << " | " << newMemSize << "x32" << " ]";
};
}
bool Executive::go(OnOpFunc const& _onOp)
{
if (m_vm)
{
boost::timer t;
auto sgas = m_vm->gas();
bool revert = false;
try
{
m_out = m_vm->go(*m_ext, _onOp);
if (m_ext)
{
m_endGas += min((m_t.gas() - m_endGas) / 2, m_ext->sub.refunds);
m_logs = m_ext->sub.logs;
}
m_endGas = m_vm->gas();
}
catch (StepsDone const&)
{
return false;
}
catch (VMException const& _e)
{
clog(StateChat) << "Safe VM Exception: " << diagnostic_information(_e);
m_endGas = 0;//m_vm->gas();
revert = true;
}
catch (Exception const& _e)
{
// TODO: AUDIT: check that this can never reasonably happen. Consider what to do if it does.
cwarn << "Unexpected exception in VM. There may be a bug in this implementation. " << diagnostic_information(_e);
}
catch (std::exception const& _e)
{
// TODO: AUDIT: check that this can never reasonably happen. Consider what to do if it does.
cwarn << "Unexpected std::exception in VM. This is probably unrecoverable. " << _e.what();
}
cnote << "VM took:" << t.elapsed() << "; gas used: " << (sgas - m_endGas);
// Write state out only in the case of a non-excepted transaction.
if (revert)
{
m_ext->revert();
// Explicitly delete a newly created address - this will still be in the reverted state.
if (m_newAddress)
{
m_s.m_cache.erase(m_newAddress);
m_newAddress = Address();
}
}
}
return true;
}
u256 Executive::gas() const
{
return m_vm ? m_vm->gas() : m_endGas;
}
void Executive::finalize(OnOpFunc const&)
{
if (m_t.isCreation() && m_newAddress && m_out.size())
// non-reverted creation - put code in place.
m_s.m_cache[m_newAddress].setCode(m_out);
// cnote << "Refunding" << formatBalance(m_endGas * m_ext->gasPrice) << "to origin (=" << m_endGas << "*" << formatBalance(m_ext->gasPrice) << ")";
m_s.addBalance(m_sender, m_endGas * m_t.gasPrice());
u256 feesEarned = (m_t.gas() - m_endGas) * m_t.gasPrice();
// cnote << "Transferring" << formatBalance(gasSpent) << "to miner.";
m_s.addBalance(m_s.m_currentBlock.coinbaseAddress, feesEarned);
if (m_ms)
m_ms->output = m_out.toBytes();
// Suicides...
if (m_ext)
for (auto a: m_ext->sub.suicides)
m_s.m_cache[a].kill();
}