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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