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d2ab5df62b
We've made a few small changes to reduce the amount of stack we use when typechecking nested method calls (eg `foo:bar():baz():quux()`). We've also fixed a small bytecode compiler issue that caused us to emit redundant jump instructions in code that conditionally uses `break` or `continue`. On the new solver, we've switched to a new, better way to handle augmentations to unsealed tables. We've also made some substantial improvements to type inference and error reporting on function calls. These things should both be on par with the old solver now. The main improvements to the native code generator have been elimination of some redundant type tag checks. Also, we are starting to inline particular fastcalls directly to IR. --------- Co-authored-by: Arseny Kapoulkine <arseny.kapoulkine@gmail.com> Co-authored-by: Vyacheslav Egorov <vegorov@roblox.com>
86 lines
3.1 KiB
C++
86 lines
3.1 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/Location.h"
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#include "Luau/NotNull.h"
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#include "Luau/Type.h"
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#include <unordered_map>
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#include <optional>
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#include <memory>
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namespace Luau
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{
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struct Scope;
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using ScopePtr = std::shared_ptr<Scope>;
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struct Binding
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{
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TypeId typeId;
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Location location;
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bool deprecated = false;
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std::string deprecatedSuggestion;
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std::optional<std::string> documentationSymbol;
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};
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struct Scope
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{
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explicit Scope(TypePackId returnType); // root scope
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explicit Scope(const ScopePtr& parent, int subLevel = 0); // child scope. Parent must not be nullptr.
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const ScopePtr parent; // null for the root
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// All the children of this scope.
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std::vector<NotNull<Scope>> children;
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std::unordered_map<Symbol, Binding> bindings;
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TypePackId returnType;
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std::optional<TypePackId> varargPack;
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TypeLevel level;
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std::unordered_map<Name, TypeFun> exportedTypeBindings;
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std::unordered_map<Name, TypeFun> privateTypeBindings;
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std::unordered_map<Name, Location> typeAliasLocations;
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std::unordered_map<Name, Location> typeAliasNameLocations;
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std::unordered_map<Name, ModuleName> importedModules; // Mapping from the name in the require statement to the internal moduleName.
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std::unordered_map<Name, std::unordered_map<Name, TypeFun>> importedTypeBindings;
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DenseHashSet<Name> builtinTypeNames{""};
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void addBuiltinTypeBinding(const Name& name, const TypeFun& tyFun);
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std::optional<TypeId> lookup(Symbol sym) const;
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std::optional<TypeId> lookup(DefId def) const;
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std::optional<std::pair<Binding*, Scope*>> lookupEx(Symbol sym);
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std::optional<TypeFun> lookupType(const Name& name);
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std::optional<TypeFun> lookupImportedType(const Name& moduleAlias, const Name& name);
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std::unordered_map<Name, TypePackId> privateTypePackBindings;
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std::optional<TypePackId> lookupPack(const Name& name);
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// WARNING: This function linearly scans for a string key of equal value! It is thus O(n**2)
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std::optional<Binding> linearSearchForBinding(const std::string& name, bool traverseScopeChain = true) const;
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RefinementMap refinements;
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DenseHashMap<const Def*, TypeId> dcrRefinements{nullptr};
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// For mutually recursive type aliases, it's important that
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// they use the same types for the same names.
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// For instance, in `type Tree<T> { data: T, children: Forest<T> } type Forest<T> = {Tree<T>}`
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// we need that the generic type `T` in both cases is the same, so we use a cache.
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std::unordered_map<Name, TypeId> typeAliasTypeParameters;
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std::unordered_map<Name, TypePackId> typeAliasTypePackParameters;
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};
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// Returns true iff the left scope encloses the right scope. A Scope* equal to
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// nullptr is considered to be the outermost-possible scope.
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bool subsumesStrict(Scope* left, Scope* right);
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// Returns true if the left scope encloses the right scope, or if they are the
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// same scope. As in subsumesStrict(), nullptr is considered to be the
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// outermost-possible scope.
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bool subsumes(Scope* left, Scope* right);
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} // namespace Luau
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