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https://github.com/luau-lang/luau.git
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ba67fb275e
* `table.sort` was improved further. It now guarentees N*log(N) time complexity in the worst case. * Fix https://github.com/Roblox/luau/issues/880 We are also working on fixing final bugs and crashes in the new type solver. On the CodeGen front we have a few things going on: * We have a smarter register allocator for the x86 JIT * We lower more instructions on arm64 * The vector constructor builtin is now translated to IR --------- Co-authored-by: Arseny Kapoulkine <arseny.kapoulkine@gmail.com> Co-authored-by: Vyacheslav Egorov <vegorov@roblox.com>
113 lines
2.7 KiB
C++
113 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/Variant.h"
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#include <string>
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namespace Luau
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{
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struct Scope;
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/**
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* The 'level' of a Type is an indirect way to talk about the scope that it 'belongs' too.
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* To start, read http://okmij.org/ftp/ML/generalization.html
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*
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* We extend the idea by adding a "sub-level" which helps us to differentiate sibling scopes
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* within a single larger scope.
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*
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* We need this because we try to prototype functions and add them to the type environment before
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* we check the function bodies. This allows us to properly typecheck many scenarios where there
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* is no single good order in which to typecheck a program.
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*/
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struct TypeLevel
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{
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int level = 0;
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int subLevel = 0;
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// Returns true if the level of "this" belongs to an equal or larger scope than that of rhs
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bool subsumes(const TypeLevel& rhs) const
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{
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if (level < rhs.level)
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return true;
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if (level > rhs.level)
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return false;
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if (subLevel == rhs.subLevel)
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return true; // if level == rhs.level and subLevel == rhs.subLevel, then they are the exact same TypeLevel
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// Sibling TypeLevels (that is, TypeLevels that share a level but have a different subLevel) are not considered to subsume one another
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return false;
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}
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// Returns true if the level of "this" belongs to a larger (not equal) scope than that of rhs
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bool subsumesStrict(const TypeLevel& rhs) const
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{
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if (level == rhs.level && subLevel == rhs.subLevel)
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return false;
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else
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return subsumes(rhs);
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}
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TypeLevel incr() const
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{
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TypeLevel result;
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result.level = level + 1;
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result.subLevel = 0;
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return result;
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}
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};
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inline TypeLevel max(const TypeLevel& a, const TypeLevel& b)
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{
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if (a.subsumes(b))
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return b;
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else
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return a;
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}
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inline TypeLevel min(const TypeLevel& a, const TypeLevel& b)
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{
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if (a.subsumes(b))
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return a;
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else
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return b;
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}
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} // namespace Luau
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namespace Luau::Unifiable
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{
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using Name = std::string;
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int freshIndex();
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template<typename Id>
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struct Bound
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{
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explicit Bound(Id boundTo)
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: boundTo(boundTo)
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{
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}
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Id boundTo;
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};
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struct Error
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{
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// This constructor has to be public, since it's used in Type and TypePack,
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// but shouldn't be called directly. Please use errorRecoveryType() instead.
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Error();
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int index;
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private:
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static int nextIndex;
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};
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template<typename Id, typename... Value>
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using Variant = Luau::Variant<Bound<Id>, Error, Value...>;
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} // namespace Luau::Unifiable
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