71 lines
2.5 KiB
C++
71 lines
2.5 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/Type.h"
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#include "Luau/TypeArena.h"
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#include "Luau/TypePack.h"
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#include "Luau/Variant.h"
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namespace Luau
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{
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namespace detail
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{
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template<typename T>
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struct ReductionContext
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{
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T type = nullptr;
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bool irreducible = false;
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};
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} // namespace detail
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struct TypeReductionOptions
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{
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/// If it's desirable for type reduction to allocate into a different arena than the TypeReduction instance you have, you will need
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/// to create a temporary TypeReduction in that case, and set [`TypeReductionOptions::allowTypeReductionsFromOtherArenas`] to true.
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/// This is because TypeReduction caches the reduced type.
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bool allowTypeReductionsFromOtherArenas = false;
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};
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struct TypeReduction
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{
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explicit TypeReduction(
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NotNull<TypeArena> arena, NotNull<BuiltinTypes> builtinTypes, NotNull<InternalErrorReporter> handle, const TypeReductionOptions& opts = {});
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TypeReduction(const TypeReduction&) = delete;
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TypeReduction& operator=(const TypeReduction&) = delete;
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TypeReduction(TypeReduction&&) = default;
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TypeReduction& operator=(TypeReduction&&) = default;
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std::optional<TypeId> reduce(TypeId ty);
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std::optional<TypePackId> reduce(TypePackId tp);
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std::optional<TypeFun> reduce(const TypeFun& fun);
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/// Creating a child TypeReduction will allow the parent TypeReduction to share its memoization with the child TypeReductions.
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/// This is safe as long as the parent's TypeArena continues to outlive both TypeReduction memoization.
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TypeReduction fork(NotNull<TypeArena> arena, const TypeReductionOptions& opts = {}) const;
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private:
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const TypeReduction* parent = nullptr;
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NotNull<TypeArena> arena;
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NotNull<BuiltinTypes> builtinTypes;
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NotNull<struct InternalErrorReporter> handle;
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TypeReductionOptions options;
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DenseHashMap<TypeId, detail::ReductionContext<TypeId>> memoizedTypes{nullptr};
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DenseHashMap<TypePackId, detail::ReductionContext<TypePackId>> memoizedTypePacks{nullptr};
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// Computes an *estimated length* of the cartesian product of the given type.
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size_t cartesianProductSize(TypeId ty) const;
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bool hasExceededCartesianProductLimit(TypeId ty) const;
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bool hasExceededCartesianProductLimit(TypePackId tp) const;
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std::optional<TypeId> memoizedof(TypeId ty) const;
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std::optional<TypePackId> memoizedof(TypePackId tp) const;
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};
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} // namespace Luau
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