* General
- Fix the benchmark require wrapper function to work in Lua
- Fix memory leak in the new Luau C API test
* New Solver
- Luau: type functions should be able to signal whether or not irreducibility is due to an error
- Do not generate extra expansion constraint for uninvoked user-defined type functions
- Print in a user-defined type function should be reported as an error
instead of logging to stdout
- Many e-graphs bugfixes and performance improvements
- Many general bugfixes and improvements to the new solver as a whole
- Fixed issue with Luau used-defined type functions not having all environments initialized
- Infer types of globals under new type solver
* Fragment Autocomplete
- Miscellaneous fixes to make interop with the old solver better
* Runtime
- Support disabling specific Luau built-in functions from being
fast-called or constant-evaluated
- Added constant folding for vector arithmetic
- Added constant propagation and type inference for Vector3 globals
----------------------------------------------------------
9 contributors:
Co-authored-by: Aaron Weiss <aaronweiss@roblox.com>
Co-authored-by: Andy Friesen <afriesen@roblox.com>
Co-authored-by: Aviral Goel <agoel@roblox.com>
Co-authored-by: Daniel Angel <danielangel@roblox.com>
Co-authored-by: Jonathan Kelaty <jkelaty@roblox.com>
Co-authored-by: Hunter Goldstein <hgoldstein@roblox.com>
Co-authored-by: Varun Saini <vsaini@roblox.com>
Co-authored-by: Vighnesh Vijay <vvijay@roblox.com>
Co-authored-by: Vyacheslav Egorov <vegorov@roblox.com>
> What's new?
* Fragment Autocomplete: a new API allows for type checking a small
fragment of code against an existing file, significantly speeding up
autocomplete performance in large files.
> New Solver
* E-Graphs have landed: this is an ongoing approach to make the new type solver
simplify types in a more consistent and principled manner, based on
similar work (e.g.: https://egraphs-good.github.io/).
* Adds support for exported / local user type functions.
* Fixes a set of bugs in which the new solver will fail to complete
inference for simple expressions with just literals and operators.
> General
* It is now an explicit runtime error to `require` a path with a ".lua" or
".luau" extension, and the error message will suggest removing the extension.
```
require("path/to/mymodule.lua")
```
* Fixes a bug in which whether two `Symbol`s are equal depends on
whether the new solver is enabled.
- Add SUBRK and DIVRK bytecode instructions
- Enables future performance optimizations
Miscellaneous
- Small performance improvements to new non-strict mode
- Introduce more scripts for fuzzing
- Improcements to dataflow analysis
* Add a missing recursion limiter in `Unifier::tryUnifyTables`. This was causing a crash in certain situations.
* Luau heap graph enumeration improvements:
* Weak references are not reported
* Added tag as a fallback name of non-string table links
* Included top Luau function information in thread name to understand where thread might be suspended
* Constant folding for `math.pi` and `math.huge` at -O2
* Optimize `string.format` and `%*`
* This change makes string interpolation 1.5x-2x faster depending on the number and type of formatted components, assuming a few are using primitive types, and reduces associated GC pressure.
New solver
* Initial work toward tracking the upper and lower bounds of types more accurately.
JIT
* Add IrCmd::CHECK_TRUTHY for improved assert fast-calls
* Do not compute type map for modules without types
* Capture metatable+readonly state for NEW_TABLE IR instructions
* Replace JUMP_CMP_ANY with CMP_ANY and existing JUMP_EQ_INT
* Add support for exits to VM with reentry lock in VmExit
