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119 lines
3.3 KiB
119 lines
3.3 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.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 "ExtVM.h"
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#include <exception>
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#include <boost/thread.hpp>
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#include "Executive.h"
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using namespace dev;
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using namespace dev::eth;
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namespace
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{
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static unsigned const c_depthLimit = 1024;
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/// Upper bound of stack space needed by single CALL/CREATE execution. Set experimentally.
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static size_t const c_singleExecutionStackSize =
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#ifdef NDEBUG
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12 * 1024;
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#else
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33 * 1024;
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#endif
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/// Standard OSX thread stack limit. Should be reasonable for other platforms too.
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static size_t const c_defaultStackSize = 512 * 1024;
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/// Stack overhead prior to allocation.
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static size_t const c_entryOverhead = 128 * 1024;
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/// On what depth execution should be offloaded to additional separated stack space.
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static unsigned const c_offloadPoint = (c_defaultStackSize - c_entryOverhead) / c_singleExecutionStackSize;
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void goOnOffloadedStack(Executive& _e, OnOpFunc const& _onOp)
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{
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// Set new stack size enouth to handle the rest of the calls up to the limit.
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boost::thread::attributes attrs;
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attrs.set_stack_size((c_depthLimit - c_offloadPoint) * c_singleExecutionStackSize);
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// Create new thread with big stack and join immediately.
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// TODO: It is possible to switch the implementation to Boost.Context or similar when the API is stable.
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std::exception_ptr exception;
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boost::thread{attrs, [&]{
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try
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{
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_e.go(_onOp);
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}
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catch (...)
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{
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exception = std::current_exception(); // Catch all exceptions to be rethrown in parent thread.
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}
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}}.join();
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if (exception)
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std::rethrow_exception(exception);
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}
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void go(unsigned _depth, Executive& _e, OnOpFunc const& _onOp)
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{
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// If in the offloading point we need to switch to additional separated stack space.
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// Current stack is too small to handle more CALL/CREATE executions.
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// It needs to be done only once as newly allocated stack space it enough to handle
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// the rest of the calls up to the depth limit (c_depthLimit).
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if (_depth == c_offloadPoint)
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goOnOffloadedStack(_e, _onOp);
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else
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_e.go(_onOp);
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}
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}
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bool ExtVM::call(CallParameters& _p)
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{
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Executive e(m_s, envInfo(), depth + 1);
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if (!e.call(_p, gasPrice, origin))
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{
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#if __clang__ // Enabled for clang only as the problem affects OSX
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go(depth, e, _p.onOp);
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#else
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e.go(_p.onOp);
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#endif
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e.accrueSubState(sub);
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}
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_p.gas = e.gas();
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return !e.excepted();
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}
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h160 ExtVM::create(u256 _endowment, u256& io_gas, bytesConstRef _code, OnOpFunc const& _onOp)
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{
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// Increment associated nonce for sender.
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m_s.noteSending(myAddress);
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Executive e(m_s, envInfo(), depth + 1);
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if (!e.create(myAddress, _endowment, gasPrice, io_gas, _code, origin))
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{
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go(depth, e, _onOp);
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e.accrueSubState(sub);
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}
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io_gas = e.gas();
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return e.newAddress();
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}
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