luau/Analysis/include/Luau/Connective.h
vegorov-rbx 59ae47db43
Sync to upstream/release/555 (#768)
* Type mismatch errors now mention if unification failed in covariant or
invariant context, to explain why sometimes derived class can't be
converted to base class or why `T` can't be converted into `T?` and so
on
* Class type indexing is no longer an error in non-strict mode (still an
error in strict mode)
* Fixed cyclic type packs not being displayed in the type
* Added an error when unrelated types are compared with `==`/`~=`
* Fixed false positive errors involving sub-type tests an `never` type
* Fixed miscompilation of multiple assignment statements (Fixes
https://github.com/Roblox/luau/issues/754)
* Type inference stability improvements
2022-12-02 10:09:59 -08:00

70 lines
1.4 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 "Luau/Def.h"
#include "Luau/TypedAllocator.h"
#include "Luau/Variant.h"
#include <memory>
namespace Luau
{
struct TypeVar;
using TypeId = const TypeVar*;
struct Negation;
struct Conjunction;
struct Disjunction;
struct Equivalence;
struct Proposition;
using Connective = Variant<Negation, Conjunction, Disjunction, Equivalence, Proposition>;
using ConnectiveId = Connective*; // Can and most likely is nullptr.
struct Negation
{
ConnectiveId connective;
};
struct Conjunction
{
ConnectiveId lhs;
ConnectiveId rhs;
};
struct Disjunction
{
ConnectiveId lhs;
ConnectiveId rhs;
};
struct Equivalence
{
ConnectiveId lhs;
ConnectiveId rhs;
};
struct Proposition
{
DefId def;
TypeId discriminantTy;
};
template<typename T>
const T* get(ConnectiveId connective)
{
return get_if<T>(connective);
}
struct ConnectiveArena
{
TypedAllocator<Connective> allocator;
ConnectiveId negation(ConnectiveId connective);
ConnectiveId conjunction(ConnectiveId lhs, ConnectiveId rhs);
ConnectiveId disjunction(ConnectiveId lhs, ConnectiveId rhs);
ConnectiveId equivalence(ConnectiveId lhs, ConnectiveId rhs);
ConnectiveId proposition(DefId def, TypeId discriminantTy);
};
} // namespace Luau