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Sketch compiler locals #154

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tekknolagi Aug 9, 2026
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tekknolagi Aug 9, 2026
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34 changes: 34 additions & 0 deletions _posts/2026-08-09-locals.md
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---
title: "Representing local variables in compiler IRs"
layout: post
---

It's useful to lift local variables into SSA nodes in a compiler

But local variables can be observed/reified by explicit runtime reflection
(incl. `locals()`, `eval()`, ...), exceptions, debuggers

Local variables also have nonlocal things sometimes like Ruby blocks

LLVM

* CFG
* Allocate everything on stack
* mem2reg

PyPy

* Trace

JavaScriptCore

Cinder

* FrameState
* Ignore `locals()`/`sys._getframe`

ZJIT

Graal

* FrameState
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