luau/Analysis/include/Luau/Unifier2.h
aaron 16fbfe912c
Sync to upstream/release/596 (#1050)
- Cleaned up `FFlag::FixFindBindingAtFunctionName`,
`FFlag::LuauNormalizeBlockedTypes`, `FFlag::LuauPCallDebuggerFix`
- Added support for break and continue into control flow analysis
- The old type unification engine will now report a more fine-grained
error at times, indicating that type normalization in particular failed

# New Type Solver

- Refactor of Unifier2, the new unification implementation for Luau
- Completed MVP of new unification implementation
- Dramatically simplified overload selection logic
- Type family reduction can now apply sooner to free types that have
been solved
- Subtyping now supports table indexers
- Generalization now replaces bad generics with unknown

# Native Code Generation

- Reduce stack spills caused by FINDUPVAL and STORE_TAG
- Improve Generate SHL/SHR/SAR/rotates with immediate operands in X64
- Removed redundant case re-check in table lookup fallback

---------

Co-authored-by: Arseny Kapoulkine <arseny.kapoulkine@gmail.com>
Co-authored-by: Vyacheslav Egorov <vegorov@roblox.com>
Co-authored-by: Andy Friesen <afriesen@roblox.com>
Co-authored-by: Lily Brown <lbrown@roblox.com>
2023-09-22 12:12:15 -07:00

114 lines
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C++

// This file is part of the Luau programming language and is licensed under MIT License; see LICENSE.txt for details
#pragma once
#include "Luau/DenseHash.h"
#include "Luau/NotNull.h"
#include "Type.h"
#include "TypeCheckLimits.h"
#include "TypeChecker2.h"
#include <optional>
#include <vector>
#include <utility>
namespace Luau
{
using TypeId = const struct Type*;
using TypePackId = const struct TypePackVar*;
struct BuiltinTypes;
struct InternalErrorReporter;
struct Scope;
struct TypeArena;
enum class OccursCheckResult
{
Pass,
Fail
};
struct TypePairHash
{
size_t hashOne(Luau::TypeId key) const
{
return (uintptr_t(key) >> 4) ^ (uintptr_t(key) >> 9);
}
size_t hashOne(Luau::TypePackId key) const
{
return (uintptr_t(key) >> 4) ^ (uintptr_t(key) >> 9);
}
size_t operator()(const std::pair<Luau::TypeId, Luau::TypeId>& x) const
{
return hashOne(x.first) ^ (hashOne(x.second) << 1);
}
size_t operator()(const std::pair<Luau::TypePackId, Luau::TypePackId>& x) const
{
return hashOne(x.first) ^ (hashOne(x.second) << 1);
}
};
struct Unifier2
{
NotNull<TypeArena> arena;
NotNull<BuiltinTypes> builtinTypes;
NotNull<Scope> scope;
NotNull<InternalErrorReporter> ice;
TypeCheckLimits limits;
DenseHashSet<std::pair<TypeId, TypeId>, TypePairHash> seenTypePairings{{nullptr, nullptr}};
DenseHashSet<std::pair<TypePackId, TypePackId>, TypePairHash> seenTypePackPairings{{nullptr, nullptr}};
int recursionCount = 0;
int recursionLimit = 0;
Unifier2(NotNull<TypeArena> arena, NotNull<BuiltinTypes> builtinTypes, NotNull<Scope> scope, NotNull<InternalErrorReporter> ice);
/** Attempt to commit the subtype relation subTy <: superTy to the type
* graph.
*
* @returns true if successful.
*
* Note that incoherent types can and will successfully be unified. We stop
* when we *cannot know* how to relate the provided types, not when doing so
* would narrow something down to never or broaden it to unknown.
*
* Presently, the only way unification can fail is if we attempt to bind one
* free TypePack to another and encounter an occurs check violation.
*/
bool unify(TypeId subTy, TypeId superTy);
bool unify(TypeId subTy, const FunctionType* superFn);
bool unify(const UnionType* subUnion, TypeId superTy);
bool unify(TypeId subTy, const UnionType* superUnion);
bool unify(const IntersectionType* subIntersection, TypeId superTy);
bool unify(TypeId subTy, const IntersectionType* superIntersection);
bool unify(const TableType* subTable, const TableType* superTable);
bool unify(const MetatableType* subMetatable, const MetatableType* superMetatable);
// TODO think about this one carefully. We don't do unions or intersections of type packs
bool unify(TypePackId subTp, TypePackId superTp);
std::optional<TypeId> generalize(TypeId ty);
private:
/**
* @returns simplify(left | right)
*/
TypeId mkUnion(TypeId left, TypeId right);
/**
* @returns simplify(left & right)
*/
TypeId mkIntersection(TypeId left, TypeId right);
// Returns true if needle occurs within haystack already. ie if we bound
// needle to haystack, would a cyclic TypePack result?
OccursCheckResult occursCheck(DenseHashSet<TypePackId>& seen, TypePackId needle, TypePackId haystack);
};
} // namespace Luau