https://kyo.iroiro.party/Java, JVM, GraalVM, Truffle, etc.enContents © 2026 <a href="mailto:gudzpoz@live.com">Kana</a> CC BY-SA 4.0Mon, 02 Feb 2026 13:28:24 GMTNikola (getnikola.com)http://blogs.law.harvard.edu/tech/rsshttps://kyo.iroiro.party/en/posts/juicemacs-exploring-jit-for-elisp/Kana<div><blockquote> <p> This Org-mode file was used for an <a href="https://github.com/rlister/org-present"><code>org-present</code></a> presentation at <a href="https://emacsconf.org/2025/talks/juicemacs/">EmacsConf 2025 – Juicemacs</a>. This blog post is adapted from that presentation, with added transcript and explanations for a bunch of things I didn't dig into during the presentation. </p> </blockquote> <figure> <figure> <a href="https://emacsconf.org/2025/talks/juicemacs/" width="400"><img src="https://kyo.iroiro.party/images/juicemacs-exploring-jit/emacsconf-pre.jpg" alt="emacsconf-pre.jpg" width="400"></a> </figure> </figure> <p width="64"> <img src="https://kyo.iroiro.party/images/juicemacs-exploring-jit/emacsconf-logo1-256.png" alt="emacsconf-logo1-256.png" width="64"> For <a href="https://emacsconf.org/2025/">EmacsConf 2025</a> </p> <p> Project: <a href="https://github.com/gudzpoz/Juicemacs">https://github.com/gudzpoz/Juicemacs</a> </p> <p> Contact: See <a href="https://kyo.iroiro.party/en/posts/juicemacs-exploring-jit-for-elisp#menu">the navigation bar</a> (or join <a href="https://juice.zulipchat.com">the Zulip chat</a>) </p> <p> </p><p><a href="https://kyo.iroiro.party/en/posts/juicemacs-exploring-jit-for-elisp/">Read more…</a> (33 min remaining to read)</p></div>emacsjavaperfhttps://kyo.iroiro.party/en/posts/juicemacs-exploring-jit-for-elisp/Fri, 05 Dec 2025 01:00:00 GMThttps://kyo.iroiro.party/en/posts/emacs-lisp-interpreter-with-graalvm-truffle/Kana<div><nav id="table-of-contents" role="doc-toc"> <h2>Table of Contents</h2> <div id="text-table-of-contents" role="doc-toc"> <ul> <li><a href="https://kyo.iroiro.party/en/posts/emacs-lisp-interpreter-with-graalvm-truffle/#what-is-graal-and-truffle">1. What is Graal and Truffle</a></li> <li><a href="https://kyo.iroiro.party/en/posts/emacs-lisp-interpreter-with-graalvm-truffle/#speculation-and-truffle-dsl">2. Speculation and Truffle DSL</a> <ul> <li><a href="https://kyo.iroiro.party/en/posts/emacs-lisp-interpreter-with-graalvm-truffle/#generatenodefactory">2.1. <code>@GenerateNodeFactory</code></a></li> </ul> </li> <li><a href="https://kyo.iroiro.party/en/posts/emacs-lisp-interpreter-with-graalvm-truffle/#runtime-macro-expansion">3. Runtime Macro Expansion</a> <ul> <li><a href="https://kyo.iroiro.party/en/posts/emacs-lisp-interpreter-with-graalvm-truffle/#frames-within-frames">3.1. Frames Within Frames</a></li> </ul> </li> <li><a href="https://kyo.iroiro.party/en/posts/emacs-lisp-interpreter-with-graalvm-truffle/#special-forms">4. Special Forms</a></li> <li><a href="https://kyo.iroiro.party/en/posts/emacs-lisp-interpreter-with-graalvm-truffle/#built-in-function-inlining">5. Built-In Function Inlining</a> <ul> <li><a href="https://kyo.iroiro.party/en/posts/emacs-lisp-interpreter-with-graalvm-truffle/#lazy-ast-creation">5.1. Lazy AST Creation</a></li> <li><a href="https://kyo.iroiro.party/en/posts/emacs-lisp-interpreter-with-graalvm-truffle/#function-redefinition-and-assumptions">5.2. Function Redefinition And Assumptions</a></li> </ul> </li> <li><a href="https://kyo.iroiro.party/en/posts/emacs-lisp-interpreter-with-graalvm-truffle/#emacs-lisp-closures">6. Emacs Lisp Closures</a></li> <li><a href="https://kyo.iroiro.party/en/posts/emacs-lisp-interpreter-with-graalvm-truffle/#creating-closures-in-a-loop">7. Creating Closures In a Loop</a> <ul> <li><a href="https://kyo.iroiro.party/en/posts/emacs-lisp-interpreter-with-graalvm-truffle/#sharing-ast-between-closures">7.1. Sharing AST Between Closures</a></li> </ul> </li> <li><a href="https://kyo.iroiro.party/en/posts/emacs-lisp-interpreter-with-graalvm-truffle/#anything-more">8. Anything More?</a></li> </ul> </div> </nav> <figure> <figure> <img src="https://kyo.iroiro.party/images/emacs-lisp-interpreter-with-graalvm-truffle/mandelbrot-benchmark.svg" alt="mandelbrot-benchmark.svg" class="org-svg"> </figure> <figcaption> <p> Mandelbort benchmark: Emacs (native-comp) runs 10x slower than Java or Truffle implementation ^{<a id="fnr.benchmark" class="footref" href="https://kyo.iroiro.party/en/posts/emacs-lisp-interpreter-with-graalvm-truffle/#fn.benchmark" role="doc-backlink">1</a>} </p> </figcaption> </figure> <p> So I've been working on an interpreter for <a href="https://www.gnu.org/software/emacs/manual/html_node/elisp/Introduction.html">Emacs Lisp</a> using the <a href="https://github.com/oracle/graal/tree/master/truffle">GraalVM Truffle</a> framework for a while now. As I've just completed its AST interpreter and a bytecode interpreter, I guess its time to give it a little write-up (or rather, some random babbling of various tricks). </p> <p> Although the Truffle interpreter covered here is for Emacs Lisp only, most of the following should also be applicable to other Lisp dialects and maybe other Truffle-based language implementations. </p> <p> </p><p><a href="https://kyo.iroiro.party/en/posts/emacs-lisp-interpreter-with-graalvm-truffle/">Read more…</a> (22 min remaining to read)</p></div>emacsjavaperfhttps://kyo.iroiro.party/en/posts/emacs-lisp-interpreter-with-graalvm-truffle/Thu, 01 May 2025 07:31:36 GMT