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83 lines
2.7 KiB
C++
83 lines
2.7 KiB
C++
// This file is part of the Luau programming language and is licensed under MIT License; see LICENSE.txt for details
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#pragma once
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#include "Luau/NotNull.h"
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#include "Luau/Substitution.h"
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#include "Luau/Type.h"
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#include "Luau/Unifiable.h"
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namespace Luau
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{
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struct BuiltinTypes;
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struct TxnLog;
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struct TypeArena;
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struct TypeCheckLimits;
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// A substitution which replaces generic types in a given set by free types.
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struct ReplaceGenerics : Substitution
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{
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ReplaceGenerics(const TxnLog* log, TypeArena* arena, NotNull<BuiltinTypes> builtinTypes, TypeLevel level, Scope* scope,
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const std::vector<TypeId>& generics, const std::vector<TypePackId>& genericPacks)
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: Substitution(log, arena)
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, builtinTypes(builtinTypes)
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, level(level)
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, scope(scope)
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, generics(generics)
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, genericPacks(genericPacks)
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{
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}
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NotNull<BuiltinTypes> builtinTypes;
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TypeLevel level;
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Scope* scope;
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std::vector<TypeId> generics;
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std::vector<TypePackId> genericPacks;
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bool ignoreChildren(TypeId ty) override;
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bool isDirty(TypeId ty) override;
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bool isDirty(TypePackId tp) override;
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TypeId clean(TypeId ty) override;
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TypePackId clean(TypePackId tp) override;
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};
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// A substitution which replaces generic functions by monomorphic functions
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struct Instantiation : Substitution
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{
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Instantiation(const TxnLog* log, TypeArena* arena, NotNull<BuiltinTypes> builtinTypes, TypeLevel level, Scope* scope)
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: Substitution(log, arena)
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, builtinTypes(builtinTypes)
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, level(level)
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, scope(scope)
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{
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}
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NotNull<BuiltinTypes> builtinTypes;
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TypeLevel level;
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Scope* scope;
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bool ignoreChildren(TypeId ty) override;
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bool isDirty(TypeId ty) override;
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bool isDirty(TypePackId tp) override;
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TypeId clean(TypeId ty) override;
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TypePackId clean(TypePackId tp) override;
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};
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/** Attempt to instantiate a type. Only used under local type inference.
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*
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* When given a generic function type, instantiate() will return a copy with the
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* generics replaced by fresh types. Instantiation will return the same TypeId
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* back if the function does not have any generics.
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*
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* All higher order generics are left as-is. For example, instantiation of
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* <X>(<Y>(Y) -> (X, Y)) -> (X, Y) is (<Y>(Y) -> ('x, Y)) -> ('x, Y)
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*
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* We substitute the generic X for the free 'x, but leave the generic Y alone.
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*
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* Instantiation fails only when processing the type causes internal recursion
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* limits to be exceeded.
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*/
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std::optional<TypeId> instantiate(
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NotNull<BuiltinTypes> builtinTypes, NotNull<TypeArena> arena, NotNull<TypeCheckLimits> limits, NotNull<Scope> scope, TypeId ty);
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} // namespace Luau
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