Roadmap for Improving the Type Checker
6 months ago
- #Swift
- #Compiler
- #TypeChecking
- Roadmap focuses on improving the Swift compiler's type checker, particularly expression type checking.
- Constraint solving in Swift involves type variables and constraints, including disjunction constraints for overload resolution.
- Swift imposes limits on type checking to prevent excessive time or memory usage, with counters for disjunction attempts and arena size.
- Recent improvements in Swift 6.2 and 6.3 include optimized disjunction selection and reduced constraint solver arena usage.
- Future improvements aim to optimize bindings, remove performance hacks, and enhance salvage mode for better diagnostics.
- Long-term goals include changes to operator lookup and polymorphic literals, and adopting advanced constraint solving techniques like those used in SAT solvers.