/*
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 .
*/
// SmartVM is only available if EVM JIT is enabled
#if ETH_EVMJIT
#include "SmartVM.h"
#include
#include
#include
#include
#include
#include "VMFactory.h"
namespace dev
{
namespace eth
{
namespace
{
using HitMap = std::unordered_map;
HitMap& getHitMap()
{
static HitMap s_hitMap;
return s_hitMap;
}
}
bytesConstRef SmartVM::go(u256& io_gas, ExtVMFace& _ext, OnOpFunc const& _onOp, uint64_t _steps)
{
auto codeHash = sha3(_ext.code);
auto vmKind = VMKind::Interpreter; // default VM
// Jitted EVM code already in memory?
if (evmjit::JIT::isCodeReady(eth2llvm(codeHash)))
{
cnote << "Jitted";
vmKind = VMKind::JIT;
}
else
{
// Check EVM code hit count
static const uint64_t c_hitTreshold = 1;
auto& hits = getHitMap()[codeHash];
++hits;
if (hits > c_hitTreshold)
{
cnote << "JIT selected";
vmKind = VMKind::JIT;
}
}
// TODO: Selected VM must be kept only because it returns reference to its internal memory.
// VM implementations should be stateless, without escaping memory reference.
m_selectedVM = VMFactory::create(vmKind);
return m_selectedVM->go(io_gas, _ext, _onOp, _steps);
}
}
}
#endif