luau/Common/include/Luau/ExperimentalFlags.h
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Sync to upstream/release/658 (#1625)
## What's Changed

### General
- Allow types of tables to diverge after using `table.clone` (fixes
#1617).
- Allow 2-argument vector.create in Luau.
- Fix a crash when suggesting autocomplete after encountering parsing
errors.
- Add lua_tolstringatom C API which returns the string length (whether
or not the atom exists) and which extends the existing lua_tostringatom
function the same way lua_tolstring/lua_tostring do.
- Luau now retains the DFGs of typechecked modules.

### Magic Functions Migration Note
We've made a change to the API used to define magic functions.

Previously, we had a set of function pointers on each `FunctionType`
that would be invoked by the type inference engine at the correct point.

The problem we'd run into is that they were all `std::function`s, we'd
grown quite a few of them, and Luau allocates tens of thousands of types
as it performs type inference. This adds up to a large amount of memory
for data that isn't used by 99% of types.

To slim things down a bit, we've replaced all of those `std::function`s
with a single `shared_ptr` to a new interface called `MagicFunction`.
This slims down the memory footprint of each type by about 50 bytes.

The virtual methods of `MagicFunction` have roughly 1:1 correspondence
with the old interface, so updating things should not be too difficult:

* `FunctionType::magicFunction` is now `MagicFunction::handleOldSolver`
* `FunctionType::dcrMagicFunction` is now `MagicFunction::infer`
* `FunctionType::dcrMagicRefinement` is now `MagicFunction::refine`
* `FunctionType::dcrMagicTypeCheck` is now `MagicFunction::typeCheck`

**Full Changelog**:
https://github.com/luau-lang/luau/compare/0.657...0.658

---

Co-authored-by: Andy Friesen <afriesen@roblox.com>
Co-authored-by: Ariel Weiss <aaronweiss@roblox.com>
Co-authored-by: Aviral Goel <agoel@roblox.com>
Co-authored-by: Hunter Goldstein <hgoldstein@roblox.com>
Co-authored-by: Talha Pathan <tpathan@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>
2025-01-24 12:15:19 -08:00

30 lines
1.1 KiB
C++

// This file is part of the Luau programming language and is licensed under MIT License; see LICENSE.txt for details
#pragma once
#include <string.h>
namespace Luau
{
inline bool isFlagExperimental(const char* flag)
{
// Flags in this list are disabled by default in various command-line tools. They may have behavior that is not fully final,
// or critical bugs that are found after the code has been submitted.
static const char* const kList[] = {
"LuauInstantiateInSubtyping", // requires some fixes to lua-apps code
"LuauFixIndexerSubtypingOrdering", // requires some small fixes to lua-apps code since this fixes a false negative
"StudioReportLuauAny2", // takes telemetry data for usage of any types
"LuauTableCloneClonesType", // requires fixes in lua-apps code, terrifyingly
"LuauSolverV2",
// makes sure we always have at least one entry
nullptr,
};
for (const char* item : kList)
if (item && strcmp(item, flag) == 0)
return true;
return false;
}
} // namespace Luau