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Paper detail

An Abstract Interpretation-based Model of Tracing Just-In-Time Compilation

Tracing just-in-time compilation is a popular compilation technique for the efficient implementation of dynamic languages, which is commonly used for JavaScript, Python and PHP. We provide a formal model of tracing JIT compilation of programs using abstract interpretation. Hot path detection corresponds to an abstraction of the trace semantics of the program. The optimization phase corresponds to a transform of the original program that preserves its trace semantics up to an observation modeled by some abstraction. We provide a generic framework to express dynamic optimizations and prove them correct. We instantiate it to prove the correctness of dynamic type specialization and constant variable folding. We show that our framework is more general than the model of tracing compilation introduced by Guo and Palsberg [2011] based on operational bisimulations.

preprint2015arXivOpen access
Stefano DissegnaFrancesco LogozzoFrancesco Ranzato
Programming Languages
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Stefano DissegnaFrancesco LogozzoFrancesco Ranzato

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