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                <h1 id="21102020-peter-sovietov"><span style="font-weight:normal;font-style:italic;font-size:medium">21/10/2020, Peter Sovietov</span><a class="headerlink" href="#21102020-peter-sovietov" title="Permanent link">&para;</a></h1>
<p>Очередное подтверждение тому факту, что работа над компиляторами &ndash; это не только  известные проекты-бегемоты в духе LLVM/GCC для 2-3 популярных архитектур и виртуальных машин. </p>
<p>Вы слышали о BPF? Впрочем, что я говорю, если читаете внимательно PLComp, то, конечно, слышали. Но, в любом случае, есть замечательная заметка, которая вводит в предмет: </p>
<p><strong>BPF, XDP, Packet Filters and UDP </strong>
<a href="https://fly.io/blog/bpf-xdp-packet-filters-and-udp/">https://fly.io/blog/bpf-xdp-packet-filters-and-udp/</a></p>
<p>Посмотрите, сколько всего интересного! Узкая предметная область, виртуальные машины, JIT-компиляция, статический анализ кода, верификация.</p>
<p>В заметке есть ссылка на хорошую статью 1999 года: </p>
<p><strong>BPF+: Exploiting Global Data-flow Optimization in a Generalized Packet Filter Architecture </strong>
<a href="https://andrewbegel.com/papers/bpf.pdf">https://andrewbegel.com/papers/bpf.pdf</a></p>
<p>Ничего себе, да? Такие-то технологии для, вроде бы, заурядной задачи фильтрации пакетов!</p>
<p>И вот кульминация, статья уже совсем свежая:</p>
<p><strong>Specification and verification in the field: Applying formal methods to BPF just-in-time compilers in the Linux kernel </strong>
<a href="https://unsat.cs.washington.edu/papers/nelson-jitterbug.pdf">https://unsat.cs.washington.edu/papers/nelson-jitterbug.pdf</a></p>
<p>Складывается ощущение, что BPF &ndash; своеобразный полигон для обкатки перспективных технологий компиляции. Это объяснимо: на исходный язык и вычисления накладываются жесткие ограничения, сама виртуальная машина простая &ndash; есть где развернуться и применить что-нибудь изощренное. И, разумеется, интересны перспективы использования BPF в специализированных аппаратных решениях.</p>
<p>P.S. Вообще, в области обработки сетевых пакетов компиляторные технологии в целом развиваются очень интересным образом, существуют работающие подходы из области синтеза программ и я к этой теме еще обязательно вернусь.</p>
<p><a href="bpf.html">#bpf</a> <a href="analysis.html">#analysis</a> <a href="verification.html">#verification</a> <a href="jit.html">#jit</a> <a href="vm.html">#vm</a></p>
<hr />
<h1 id="19052020"><span style="font-weight:normal;font-style:italic;font-size:medium">19/05/2020</span><a class="headerlink" href="#19052020" title="Permanent link">&para;</a></h1>
<p>Работа по синтезу программ с использованием Rosette (Racket). Cинтезируется JIT-компилятор DSL BPF (ядро Linux) в машинный код (в примере использован RISC-V)
<strong>Synthesizing JIT Compilers for In-Kernel DSLs </strong>
<a href="https://www.cs.utexas.edu/~isil/jitsynth.pdf">https://www.cs.utexas.edu/~isil/jitsynth.pdf</a></p>
<p>Подробности о BPF VM:
<strong>BPF: A New Type of Software </strong>
<a href="http://www.brendangregg.com/blog/2019-12-02/bpf-a-new-type-of-software.html">http://www.brendangregg.com/blog/2019-12-02/bpf-a-new-type-of-software.html</a></p>
<p><a href="jit.html">#jit</a> <a href="synthesis.html">#synthesis</a> <a href="bpf.html">#bpf</a></p>
                
              
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