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Dynamic programming languages face semantic and performance challenges in thepresence of features, such as eval, that can inject new code into a runningprogram. The Julia programming language introduces the novel concept of worldage to insulate optimized code from one of the most disruptive side-effects ofeval: changes to the definition of an existing function. This paper providesthe first formal semantics of world age in a core calculus named Juliette, andshows how world age enables compiler optimizations, such as inlining, in thepresence of eval. While Julia also provides programmers with the means tobypass world age, we found that this mechanism is not used extensively: astatic analysis of over 4,000 registered Julia packages shows that only 4-9% ofpackages bypass world age. This suggests that Julia's semantics aligns withprogrammer expectations.

World Age in Julia: Optimizing Method Dispatch in the Presence of Eval (Extended Version)