Analyzing and updating code with JuliaInterpreter and Revise
2019-07-25, 17:05–17:15, Elm B

Revise.jl allows you to modify code in your running Julia session. Revise was recently rewritten around JuliaInterpreter.jl and a new query interface, CodeTracking.jl, resulting in many improvements and easier access to Revise’s internal data.


Revise.jl serves a dynamic bridge between the text in source files and the compiled methods in your running Julia session. To faithfully bridge these two worlds, Revise needs to understand quite a bit about code. Historically, Revise analyzed expressions written in Julia’s surface syntax; however, recent examples revealed a number of weaknesses in this approach. To address these limitations, starting with version 2.0 Revise has leveraged JuliaInterpreter.jl to perform its analysis of code using Julia’s internal lowered-form representation. This has resulted in dramatic improvements in the number of methods that can be tracked by their signatures, and may allow new capabilities such as discovery of block-level interdependencies. At the same time, Revise’s internal data structures have been reorganized to simplify access by other packages, resulting in a lightweight standalone package CodeTracking.jl. I will describe the motivations for these changes and the solutions enabled by the new approach, and demonstrate some of the dramatic improvements this has netted for dependent packages like Rebugger.jl.


Co-authors