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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.cpp
* @author Gav Wood <i@gavwood.com>
* @date 2014
*/
#include "ExtVM.h"
#include <exception>
#include <boost/thread.hpp>
#include "Executive.h"
using namespace dev;
using namespace dev::eth;
namespace
{
static unsigned const c_depthLimit = 1024;
/// Upper bound of stack space needed by single CALL/CREATE execution. Set experimentally.
static size_t const c_singleExecutionStackSize = 12 * 1024;
/// Standard OSX thread stack limit. Should be reasonable for other platforms too.
static size_t const c_defaultStackSize = 512 * 1024;
/// On what depth execution should be offloaded to additional separated stack space.
static unsigned const c_offloadPoint = c_defaultStackSize / c_singleExecutionStackSize;
void goOnOffloadedStack(Executive& _e, OnOpFunc const& _onOp)
{
// Set new stack size enouth to handle the rest of the calls up to the limit.
boost::thread::attributes attrs;
attrs.set_stack_size((c_depthLimit - c_offloadPoint) * c_singleExecutionStackSize);
// Create new thread with big stack and join immediately.
// TODO: It is possible to switch the implementation to Boost.Context or similar when the API is stable.
std::exception_ptr exception;
boost::thread{attrs, [&]{
try
{
_e.go(_onOp);
}
catch (...)
{
exception = std::current_exception(); // Catch all exceptions to be rethrown in parent thread.
}
}}.join();
if (exception)
std::rethrow_exception(exception);
}
void go(unsigned _depth, Executive& _e, OnOpFunc const& _onOp)
{
// If in the offloading point we need to switch to additional separated stack space.
// Current stack is too small to handle more CALL/CREATE executions.
// It needs to be done only once as newly allocated stack space it enough to handle
// the rest of the calls up to the depth limit (c_depthLimit).
#if __GNUC__
if (_depth == c_offloadPoint)
goOnOffloadedStack(_e, _onOp);
else
#endif
_e.go(_onOp);
}
}
bool ExtVM::call(CallParameters& _p)
{
Executive e(m_s, lastHashes, depth + 1);
if (!e.call(_p, gasPrice, origin))
{
go(depth, e, _p.onOp);
e.accrueSubState(sub);
}
_p.gas = e.gas();
return !e.excepted();
}
h160 ExtVM::create(u256 _endowment, u256& io_gas, bytesConstRef _code, OnOpFunc const& _onOp)
{
// Increment associated nonce for sender.
m_s.noteSending(myAddress);
Executive e(m_s, lastHashes, depth + 1);
if (!e.create(myAddress, _endowment, gasPrice, io_gas, _code, origin))
{
go(depth, e, _onOp);
e.accrueSubState(sub);
}
io_gas = e.gas();
return e.newAddress();
}