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80 lines
1.9 KiB
80 lines
1.9 KiB
10 years ago
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/*
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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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// SmartVM is only available if EVM JIT is enabled
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#if ETH_EVMJIT
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#include "SmartVM.h"
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#include <unordered_map>
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#include <libdevcore/Log.h>
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#include <libdevcrypto/SHA3.h>
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#include <evmjit/JIT.h>
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#include <evmjit/libevmjit-cpp/Utils.h>
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#include "VMFactory.h"
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namespace dev
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{
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namespace eth
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{
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namespace
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{
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using HitMap = std::unordered_map<h256, uint64_t>;
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HitMap& getHitMap()
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{
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static HitMap s_hitMap;
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return s_hitMap;
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}
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}
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bytesConstRef SmartVM::go(ExtVMFace& _ext, OnOpFunc const& _onOp, uint64_t _steps)
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{
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auto codeHash = sha3(_ext.code);
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auto vmKind = VMKind::Interpreter; // default VM
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// Jitted EVM code already in memory?
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if (evmjit::JIT::isCodeReady(eth2llvm(codeHash)))
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{
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cnote << "Jitted";
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vmKind = VMKind::JIT;
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}
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else
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{
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// Check EVM code hit count
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static const uint64_t c_hitTreshold = 1;
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auto& hits = getHitMap()[codeHash];
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++hits;
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if (hits > c_hitTreshold)
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{
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cnote << "JIT selected";
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vmKind = VMKind::JIT;
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}
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}
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// TODO: Selected VM must be kept only because it returns reference to its internal memory.
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// VM implementations should be stateless, without gas counter and escaping memory reference.
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m_selectedVM = VMFactory::create(vmKind, gas());
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auto out = m_selectedVM->go(_ext, _onOp, _steps);
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m_gas = m_selectedVM->gas();
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return out;
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}
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}
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}
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#endif
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