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244 lines
7.2 KiB
244 lines
7.2 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 Executive.cpp
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* @author Gav Wood <i@gavwood.com>
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* @date 2014
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*/
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#include <boost/timer.hpp>
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#include <libevm/VM.h>
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#include "Executive.h"
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#include "State.h"
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#include "ExtVM.h"
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using namespace std;
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using namespace dev;
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using namespace dev::eth;
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#define ETH_VMTRACE 1
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Executive::~Executive()
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{
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// TODO: Make safe.
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delete m_ext;
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delete m_vm;
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}
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u256 Executive::gasUsed() const
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{
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return m_t.gas - m_endGas;
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}
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bool Executive::setup(bytesConstRef _rlp)
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{
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// Entry point for a user-executed transaction.
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m_t = Transaction(_rlp);
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m_sender = m_t.sender();
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// Avoid invalid transactions.
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auto nonceReq = m_s.transactionsFrom(m_sender);
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if (m_t.nonce != nonceReq)
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{
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clog(StateChat) << "Invalid Nonce: Require" << nonceReq << " Got" << m_t.nonce;
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throw InvalidNonce(nonceReq, m_t.nonce);
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}
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// 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.
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if (m_t.gasPrice < m_s.m_currentBlock.minGasPrice)
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{
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clog(StateChat) << "Offered gas-price is too low: Require >" << m_s.m_currentBlock.minGasPrice << " Got" << m_t.gasPrice;
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throw GasPriceTooLow();
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}
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// Check gas cost is enough.
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u256 gasCost = m_t.data.size() * c_txDataGas + c_txGas;
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if (m_t.gas < gasCost)
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{
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clog(StateChat) << "Not enough gas to pay for the transaction: Require >" << gasCost << " Got" << m_t.gas;
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throw OutOfGas();
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}
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u256 cost = m_t.value + m_t.gas * m_t.gasPrice;
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// Avoid unaffordable transactions.
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if (m_s.balance(m_sender) < cost)
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{
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clog(StateChat) << "Not enough cash: Require >" << cost << " Got" << m_s.balance(m_sender);
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throw NotEnoughCash();
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}
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u256 startGasUsed = m_s.gasUsed();
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if (startGasUsed + m_t.gas > m_s.m_currentBlock.gasLimit)
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{
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clog(StateChat) << "Too much gas used in this block: Require <" << (m_s.m_currentBlock.gasLimit - startGasUsed) << " Got" << m_t.gas;
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throw BlockGasLimitReached();
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}
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// Increment associated nonce for sender.
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m_s.noteSending(m_sender);
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// Pay...
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// cnote << "Paying" << formatBalance(cost) << "from sender (includes" << m_t.gas << "gas at" << formatBalance(m_t.gasPrice) << ")";
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m_s.subBalance(m_sender, cost);
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if (m_ms)
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{
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m_ms->from = m_sender;
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m_ms->to = m_t.receiveAddress;
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m_ms->value = m_t.value;
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m_ms->input = m_t.data;
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}
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if (m_t.isCreation())
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return create(m_sender, m_t.value, m_t.gasPrice, m_t.gas - gasCost, &m_t.data, m_sender);
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else
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return call(m_t.receiveAddress, m_sender, m_t.value, m_t.gasPrice, bytesConstRef(&m_t.data), m_t.gas - gasCost, m_sender);
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}
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bool Executive::call(Address _receiveAddress, Address _senderAddress, u256 _value, u256 _gasPrice, bytesConstRef _data, u256 _gas, Address _originAddress)
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{
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// cnote << "Transferring" << formatBalance(_value) << "to receiver.";
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m_s.addBalance(_receiveAddress, _value);
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if (m_s.addressHasCode(_receiveAddress))
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{
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m_vm = new VM(_gas);
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bytes const& c = m_s.code(_receiveAddress);
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m_ext = new ExtVM(m_s, _receiveAddress, _senderAddress, _originAddress, _value, _gasPrice, _data, &c, m_ms);
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}
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else
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m_endGas = _gas;
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return !m_ext;
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}
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bool Executive::create(Address _sender, u256 _endowment, u256 _gasPrice, u256 _gas, bytesConstRef _init, Address _origin)
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{
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// We can allow for the reverted state (i.e. that with which m_ext is constructed) to contain the m_newAddress, since
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// we delete it explicitly if we decide we need to revert.
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m_newAddress = right160(sha3(rlpList(_sender, m_s.transactionsFrom(_sender) - 1)));
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while (m_s.addressInUse(m_newAddress))
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m_newAddress = (u160)m_newAddress + 1;
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// Set up new account...
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m_s.m_cache[m_newAddress] = AddressState(0, _endowment, h256(), h256());
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// Execute _init.
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m_vm = new VM(_gas);
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m_ext = new ExtVM(m_s, m_newAddress, _sender, _origin, _endowment, _gasPrice, bytesConstRef(), _init, m_ms);
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return _init.empty();
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}
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OnOpFunc Executive::simpleTrace()
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{
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return [](uint64_t steps, Instruction inst, bigint newMemSize, bigint gasCost, void* voidVM, void const* voidExt)
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{
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ExtVM const& ext = *(ExtVM const*)voidExt;
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VM& vm = *(VM*)voidVM;
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ostringstream o;
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o << endl << " STACK" << endl;
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for (auto i: vm.stack())
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o << (h256)i << endl;
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o << " MEMORY" << endl << memDump(vm.memory());
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o << " STORAGE" << endl;
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for (auto const& i: ext.state().storage(ext.myAddress))
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o << showbase << hex << i.first << ": " << i.second << endl;
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dev::LogOutputStream<VMTraceChannel, false>(true) << o.str();
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dev::LogOutputStream<VMTraceChannel, false>(false) << " | " << dec << ext.level << " | " << ext.myAddress << " | #" << steps << " | " << hex << setw(4) << setfill('0') << vm.curPC() << " : " << instructionInfo(inst).name << " | " << dec << vm.gas() << " | -" << dec << gasCost << " | " << newMemSize << "x32" << " ]";
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};
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}
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bool Executive::go(OnOpFunc const& _onOp)
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{
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if (m_vm)
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{
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boost::timer t;
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auto sgas = m_vm->gas();
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bool revert = false;
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try
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{
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m_out = m_vm->go(*m_ext, _onOp);
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m_endGas = m_vm->gas();
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}
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catch (StepsDone const&)
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{
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return false;
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}
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catch (OutOfGas const& /*_e*/)
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{
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clog(StateChat) << "Out of Gas! Reverting.";
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revert = true;
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}
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catch (VMException const& _e)
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{
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clog(StateChat) << "VM Exception: " << _e.description();
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}
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catch (Exception const& _e)
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{
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clog(StateChat) << "Exception in VM: " << _e.description();
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}
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catch (std::exception const& _e)
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{
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clog(StateChat) << "std::exception in VM: " << _e.what();
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}
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cnote << "VM took:" << t.elapsed() << "; gas used: " << (sgas - m_endGas);
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// Write state out only in the case of a non-excepted transaction.
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if (revert)
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{
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m_ext->revert();
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// Explicitly delete a newly created address - this will still be in the reverted state.
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if (m_newAddress)
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{
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m_s.m_cache.erase(m_newAddress);
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m_newAddress = Address();
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}
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}
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}
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return true;
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}
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u256 Executive::gas() const
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{
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return m_vm ? m_vm->gas() : m_endGas;
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}
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void Executive::finalize(OnOpFunc const& _onOp)
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{
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if (m_t.isCreation() && m_newAddress && m_out.size())
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// non-reverted creation - put code in place.
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m_s.m_cache[m_newAddress].setCode(m_out);
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if (m_ext)
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m_endGas += m_ext->doPosts(_onOp);
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// cnote << "Refunding" << formatBalance(m_endGas * m_ext->gasPrice) << "to origin (=" << m_endGas << "*" << formatBalance(m_ext->gasPrice) << ")";
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m_s.addBalance(m_sender, m_endGas * m_t.gasPrice);
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u256 feesEarned = (m_t.gas - m_endGas) * m_t.gasPrice;
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// cnote << "Transferring" << formatBalance(gasSpent) << "to miner.";
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m_s.addBalance(m_s.m_currentBlock.coinbaseAddress, feesEarned);
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if (m_ms)
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m_ms->output = m_out.toBytes();
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// Suicides...
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if (m_ext)
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for (auto a: m_ext->suicides)
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m_s.m_cache[a].kill();
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}
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