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130 lines
3.2 KiB
130 lines
3.2 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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// 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 <thread>
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#include <libdevcore/concurrent_queue.h>
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#include <libdevcore/Log.h>
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#include <libdevcore/SHA3.h>
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#include <libdevcore/Guards.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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struct JitInfo: LogChannel { static const char* name() { return "JIT"; }; static const int verbosity = 11; };
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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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struct JitTask
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{
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bytes code;
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h256 codeHash;
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static JitTask createStopSentinel() { return JitTask(); }
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bool isStopSentinel()
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{
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assert((!code.empty() || !codeHash) && "'empty code => empty hash' invariand failed");
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return code.empty();
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}
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};
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class JitWorker
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{
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concurrent_queue<JitTask> m_queue;
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std::thread m_worker; // Worker must be last to initialize
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void work()
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{
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clog(JitInfo) << "JIT worker started.";
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JitTask task;
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while (!(task = m_queue.pop()).isStopSentinel())
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{
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clog(JitInfo) << "Compilation... " << task.codeHash;
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evmjit::JIT::compile(task.code.data(), task.code.size(), eth2jit(task.codeHash));
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clog(JitInfo) << " ...finished " << task.codeHash;
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}
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clog(JitInfo) << "JIT worker finished.";
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}
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public:
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JitWorker() noexcept: m_worker([this]{ work(); })
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{}
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~JitWorker()
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{
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push(JitTask::createStopSentinel());
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m_worker.join();
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}
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void push(JitTask&& _task) { m_queue.push(std::move(_task)); }
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};
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}
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bytesConstRef SmartVM::execImpl(u256& io_gas, ExtVMFace& _ext, OnOpFunc const& _onOp)
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{
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auto codeHash = _ext.codeHash;
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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(eth2jit(codeHash)))
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{
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clog(JitInfo) << "JIT: " << codeHash;
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vmKind = VMKind::JIT;
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}
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else
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{
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static JitWorker s_worker;
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// Check EVM code hit count
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static const uint64_t c_hitTreshold = 2;
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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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clog(JitInfo) << "Schedule: " << codeHash;
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s_worker.push({_ext.code, codeHash});
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}
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clog(JitInfo) << "Interpreter: " << codeHash;
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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 escaping memory reference.
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m_selectedVM = VMFactory::create(vmKind);
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return m_selectedVM->execImpl(io_gas, _ext, _onOp);
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}
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}
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}
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#endif
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