This test fails due to a bad interaction when `FFlagLuauStoreCSTData` is
enabled, whilst `FFlagLexerFixInterpStringStart` is disabled.
The OSS test suite, when run with `--fflags=true`, enables all
flags starting with a `Luau` prefix, but does not enable any other flag.
To resolve this, we explicitly enable both fflags for the failing
interpolated string test cases. As a consequence, we technically lose
the check that these tests pass when all flags are disabled.
## What's Changed
General performance improvements and bug fixes. `lua_clonetable` was
added too.
### General
## Runtime
- Improvements were made to Luau's performance, including a
`lua_clonetable` function and optimizations to string caching. Buffer
read/write operations were optimized for big-endian machines.
## New Solver
- Crashes related to duplicate keys in table literals, fragment AC
crashes, and potential hash collisions in the StringCache.
- We now handle user-defined type functions as opaque and track interior
free table types.
## Require By String
- Require-by-string path resolution was simplified.
**Full Changelog**:
https://github.com/luau-lang/luau/compare/0.658...0.659
---
Co-authored-by: Ariel Weiss <aaronweiss@roblox.com>
Co-authored-by: Andy Friesen <afriesen@roblox.com>
Co-authored-by: Hunter Goldstein <hgoldstein@roblox.com>
Co-authored-by: Vyacheslav Egorov <vegorov@roblox.com>
Co-authored-by: Varun Saini <vsaini@roblox.com>
Co-authored-by: Vighnesh Vijay <vvijay@roblox.com>
Co-authored-by: Yohoo Lin <yohoo@roblox.com>
---------
Co-authored-by: Hunter Goldstein <hgoldstein@roblox.com>
Co-authored-by: Varun Saini <61795485+vrn-sn@users.noreply.github.com>
Co-authored-by: Alexander Youngblood <ayoungblood@roblox.com>
a03c92095f6 #unflagged CLI-141149 Added lua_clonetable (#97902)
d66c43f36aa #flagged CLI-140903: Do not crash on duplicate keys in table literals (#97833)
8a2687f1690 #nonprod Luau: fix a test configuration issue breaking OSS CI. (#97878)
7add6d9dde9 #nojira CI-debugger revert #unflagged CLI-132461 Luau: refactor subtyping to also include the generic mapping it came up with. (#97872)
0c731fd3cc4 #flag-removal Clip `LuauNewSolverVisitErrorExprLvalues` (#96942)
2fe783b9615 #unflagged CLI-132461 Luau: refactor subtyping to also include the generic mapping it came up with. (#97803)
0cc41a0afae #unflagged CLI-141053 Luau buffer readbits/writebits implementation for big endian machines (#97826)
ae50bf04f99 #nonprod CLI-140027 Simplify require-by-string path resolution, fix bug when running CLI tools on unprefixed path (#97468)
77004599a6f #flag-removal Cleanup Luau VM and Compiler flags (#97799)
86777e269dd #flag-removal Remove LuauUserTypeFunPrintToError, LuauUserTypeFunNoExtraConstraint, LuauUserTypeFunUpdateAllEnvs, LuauUserTypeFunThreadBuffer and LuauUserTypeFunExportedAndLocal (#97624)
349b133fdc4 #nojira CI-debugger revert #unflagged CLI-132461 Luau: refactor subtyping to also include the generic mapping it came up with. (#97759)
2e820646ffa #flagged CLI-139615: Treat user defined type functions as opaque in eqSatSimplify (#96897)
c0845205e37 #flag-removal CLI-140688 Clean up `FFlagLuauIntersectNormalsNeedsToTrackResourceLimits` as `true`. (#97719)
3e07876a043 #flagged CLI-140571: Track interior free table types generated during constraint solving (#97498)
199b558dc36 #unflagged CLI-132461 Luau: refactor subtyping to also include the generic mapping it came up with. (#95646)
fd9255f62d3 #nonprod CLI-140762 unittest for fragment ac crash (#97669)
e9c710e017f #flag-removal FFlagLuauStoreCommentsForDefinitionFiles (#93359)
b184b940d55 CLI-140702 #unflagged Fix most clang-tidy warnings in TypeChecker2 (#97604)
1fc857f1bb3 CLI-140489 #unflagged Fix a potential hash collision bug in StringCache. (#97539)
58f62f900a2 #nonprod Some new unit testing macros for Luau tests. (#97336)
ab43a354b25 #flag-removal Remove LuauVectorMetatable and LuauVectorDefinitionsExtra (#97528)
c4c28694390 #flagged CLI-140485 Do not retain the Def/RefinementKey arenas when retainFullTypeGraphs is false (#97422)
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## 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>
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During conflict resolution while transferring patches back and forth,
some conflict resolutions may cause differences that are harder to spot.
This process would have also cleaned up differences noted in
https://github.com/luau-lang/luau/pull/1621
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## General
- Fix a parsing bug related to the starting position of function names.
- Rename Luau's `Table` struct to `LuaTable`.
## New Solver
- Add support for generics in user-defined type functions
([RFC](https://rfcs.luau.org/support-for-generic-function-types-in-user-defined-type-functions.html)).
- Provide a definition of `math.lerp` to the typechecker.
- Implement error suppression in `string.format`.
- Fixes#1587.
- Ensure function call discriminant types are always filled when
resolving `FunctionCallConstraint`.
---
Co-authored-by: Ariel Weiss <aaronweiss@roblox.com>
Co-authored-by: Hunter Goldstein <hgoldstein@roblox.com>
Co-authored-by: Talha Pathan <tpathan@roblox.com>
Co-authored-by: Vyacheslav Egorov <vegorov@roblox.com>
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Implement RFC: 2-component vector constructor. This includes 2-component
overload for `vector.create` and associated fastcall function, and its
type definition. These features are controlled by a new feature flag
`LuauVector2Constructor`. Additionally constant folding now supports two
components when `LuauVector2Constants` feature flag is set.
Note: this work does not include changes to CodeGen. Thus calls to
`vector.create` with only two arguments are not natively compiled
currently. This is left for future work.
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To implement math.lerp without branches, we add SELECT_NUM which
selects one of the two inputs based on the comparison condition.
For simplicity, we only support C == D for now; this can be extended to
a more generic version with a IrCondition operand E, but that requires
more work on the SSE side (to flip the comparison for some conditions
like Greater, and expose more generic vcmpsd).
Note: On AArch64 this will effectively result in a change in floating
point
behavior between native code and non-native code: clang synthesizes
fmadd (because floating point contraction is allowed by default, and the
arch always has the instruction), whereas this change will use
fmul+fadd.
I am not sure if this is good or bad, and if this is a problem in C or
not.
Specifically, clang's behavior results in different results between X64
and AArch64 when *not* using codegen, and with this change the behavior
when using codegen is... the same? :)
Fixing this will require either using LERP_NUM instead and hand-coding
lowering, or exposing some sort of "quasi" MADD_NUM (which would
lower to fma on AArch64 and mul+add on X64).
A small benefit to the current approach is `lerp(1, 5, t)`
constant-folds the
subtraction. With LERP_NUM this optimization will need to be implemented
manually as a partial constant-folding for LERP_NUM.
A similar problem exists today for vector.cross & vector.dot. So maybe
this
is not something we need to fix, unsure.
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# General
All code has been re-formatted by `clang-format`; this is not
mechanically enforced, so Luau may go out-of-sync over the course of the
year.
# New Solver
* Track free types interior to a block of code on `Scope`, which should
reduce the number of free types that remain un-generalized after type
checking is complete (e.g.: less errors like `'a <: number is
incompatible with number`).
# Autocomplete
* Fragment autocomplete now does *not* provide suggestions within
comments (matching non-fragment autocomplete behavior).
* Autocomplete now respects iteration and recursion limits (some hangs
will now early exit with a "unification too complex error," some crashes
will now become internal complier exceptions).
# Runtime
* Add a limit to how many Luau codegen slot nodes addresses can be in
use at the same time (fixes#1605, fixes#1558).
* Added constant folding for vector arithmetic (fixes#1553).
* Added support for `buffer.readbits` and `buffer.writebits` (see:
https://github.com/luau-lang/rfcs/pull/18).
---
Co-authored-by: Aaron Weiss <aaronweiss@roblox.com>
Co-authored-by: David Cope <dcope@roblox.com>
Co-authored-by: Hunter Goldstein <hgoldstein@roblox.com>
Co-authored-by: Vighnesh Vijay <vvijay@roblox.com>
Co-authored-by: Vyacheslav Egorov <vegorov@roblox.com>
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This change implements math.lerp RFC with C function definition, builtin
function, builtin constant folding and tests.
The tests validate a few lerp properties by providing counter-examples
for popular lerp implementations; the testing is of course not
exhaustive, as exhaustive testing was done offline using fuzzing.
Type definitions will be updated separately.
Codegen support will be implemented separately: it requires new IR for
conditional
selects to represent the desired logic without using a branch.
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This PR refactors the CLI folder to use the same project split between
include and src directories that we have for all the other artifacts in
luau. It also includes the require-by-string implementation we already
have as a feature of `Luau.CLI.lib`. Both of these changes are targeted
at making it easier for embedding projects to setup an effective
equivalent to the standalone `luau` executable with whatever runtime
libraries they need attached and without having to unnecessarily
duplicate code from luau itself.
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## New Solver
* 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 reports 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 used-defined type functions not being able to call
each other
* Infer types of globals under new type solver
## Fragment Autocomplete
* Miscellaneous fixes to make interop with the old solver better
## Runtime
* Support disabling specific built-in functions from being fast-called
or constant-evaluated (Closes#1538)
* New compiler option `disabledBuiltins` accepts a list of library
function names like "tonumber" or "math.cos"
* Added constant folding for vector arithmetic
* Added constant propagation and type inference for vector globals
(Fixes#1511)
* New compiler option `librariesWithKnownMembers` accepts a list of
libraries for members of which a request for constant value and/or type
will be made
* `libraryMemberTypeCb` callback is called to get the type of a global,
return one of the `LuauBytecodeType` values. 'boolean', 'number',
'string' and 'vector' type are supported.
* `libraryMemberConstantCb` callback is called to setup the constant
value of a global. To set a value, C API `luau_set_compile_constant_*`
or C++ API `setCompileConstant*` functions should be used.
---
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>
---------
Co-authored-by: Aaron Weiss <aaronweiss@roblox.com>
Co-authored-by: Alexander McCord <amccord@roblox.com>
Co-authored-by: Andy Friesen <afriesen@roblox.com>
Co-authored-by: Aviral Goel <agoel@roblox.com>
Co-authored-by: David Cope <dcope@roblox.com>
Co-authored-by: Lily Brown <lbrown@roblox.com>
Co-authored-by: Vyacheslav Egorov <vegorov@roblox.com>
Co-authored-by: Junseo Yoo <jyoo@roblox.com>
Co-authored-by: Hunter Goldstein <hgoldstein@roblox.com>
Co-authored-by: Varun Saini <61795485+vrn-sn@users.noreply.github.com>
Co-authored-by: Alexander Youngblood <ayoungblood@roblox.com>
Co-authored-by: Varun Saini <vsaini@roblox.com>
Co-authored-by: Andrew Miranti <amiranti@roblox.com>
Co-authored-by: Shiqi Ai <sai@roblox.com>
Co-authored-by: Yohoo Lin <yohoo@roblox.com>
Co-authored-by: Daniel Angel <danielangel@roblox.com>
Co-authored-by: Jonathan Kelaty <jkelaty@roblox.com>
* 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 Changed
* Support dead store elimination for `STORE_VECTOR` instruction
* Fix parser hang when a separator is used between Luau class
declaration properties
* Provide properties and metatable for built-in vector type definition
to fix type errors
* Fix Fragment Autocomplete to ensure correct parentheses insertion
behavior.
* Add support for 'thread' and 'buffer' primitive types in user-defined
type functions
---------
Co-authored-by: Andy Friesen <afriesen@roblox.com>
Co-authored-by: Hunter Goldstein <hgoldstein@roblox.com>
Co-authored-by: Vighnesh Vijay <vvijay@roblox.com>
Co-authored-by: Vyacheslav Egorov <vegorov@roblox.com>
* Luau: support dead store elimination for STORE_VECTOR instruction
* Fixed hang when Luau class declaration props are incorrectly separated
* Provide properties and a metatable for Luau built-in vector type
* Pick the correct global scope based on the solver
* Conversational AI gets all required scripts as context
* Clip LuauRequireCyclesDontAlwaysReturnAny
* Fix Parentheses in Fragment Autocomplete
* Remove write-only locals in `Luau::getDocumentOffsets`
* The lexer can resume parsing from any arbitrary position
* Added support for 'thread' and 'buffer' primitive types in Luau user-defined type functions
---------
Co-authored-by: Andrew Miranti <amiranti@roblox.com>
Co-authored-by: Andy Friesen <afriesen@roblox.com>
Co-authored-by: Hunter Goldstein <hgoldstein@roblox.com>
Co-authored-by: Shiqi Ai <sai@roblox.com>
Co-authored-by: Vighnesh Vijay <vvijay@roblox.com>
Co-authored-by: Vyacheslav Egorov <vegorov@roblox.com>
Co-authored-by: Yohoo Lin <yohoo@roblox.com>
In all other places, L->top is extracted to a local when writing to
stack; this helps compilers without TBAA (MSVC) to not reload L->top
redundantly.
Also assert that we do in fact have 2 slots of stack space (which we
do).
This change folds:
a * 1 => a
a / 1 => a
a * -1 => -a
a / -1 => -a
a * 2 => a + a
a / 2^k => a * 2^-k
a - 0 => a
a + (-0) => a
Note that the following folds are all invalid:
a + 0 => a (breaks for negative zero)
a - (-0) => a (breaks for negative zero)
a - a => 0 (breaks for Inf/NaN)
0 - a => -a (breaks for negative zero)
Various cases of UNM_NUM could be optimized (eg (-a) * (-b) = a * b),
but that doesn't happen in benchmarks.
While it would be possible to also fold inverse multiplications (k * v),
these do not happen in benchmarks and rarely happen in bytecode due
to type based optimizations. Maybe this can be improved with some sort
of
IR canonicalization in the future if necessary.
I've considered moving some of these, like division strength reduction,
to IR translation (as this is where POW is lowered presently) but it
didn't
seem better one way or the other.
This change improves performance on some benchmarks, e.g. trig and
voxelgen,
and should be a strict uplift as it never generates more instructions or
longer
latency chains. On Apple M2, without division->multiplication
optimization, both
benchmarks see 0.1-0.2% uplift. Division optimization makes trig 3%
faster; I expect
the gains on X64 will be more muted, but on Apple this seems to allow
loop iterations
to overlap better by removing the division bottleneck.
## What's Changed?
* Optimized the vector dot product by up to 24%
* Allow for x/y/z/X/Y/Z vector field access by registering a `vector`
metatable
with an `__index` method (Fixes#1521)
* Fixed a bug preventing consistent recovery from parse errors in table
types.
* Optimized `k*n` and `k+n` when types are known
* Allow fragment autocomplete to handle cases like the automatic
insertion of
parens, keywords, strings, etc., while maintaining a correct relative
positioning
### New Solver
* Allow for `nil` assignment to tables and classes with indexers
---------
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: 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>
