Pre-evaluation in Ruby
summary
Describes a gem called Preval that parses source with Ripper AST transforms, visits and rewrites nodes (constant-folding, integer arithmetic, attr_reader/attr_writer expansion, loop simplifications), and writes the rewritten code back into Ruby via a Bootsnap compile-time hook. Changes are opt-in per visitor, happen at compile/startup so there is zero runtime overhead, and a production trial briefly deploys it (no measurable perf win there) but the tool works as a style and compile-time optimizer.
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chapters (9)
- 0:00Start
- 0:56Warning
- 1:33Compilers
- 2:10Lexical Analysis
- 3:21Semantic Analysis
- 6:09Instruction Generation
- 8:37Optimization
- 16:38Demo
- 28:20Test code
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