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42a2805f85
* A small subset of control-flow refinements have been added to recognize type options that are unreachable after a conditional/unconditional code block. (Fixes https://github.com/Roblox/luau/issues/356). Some examples: ```lua local function f(x: string?) if not x then return end -- x is 'string' here end ``` Throwing calls like `error` or `assert(false)` instead of 'return' are also recognized. Existing complex refinements like type/typeof and tagged union checks are expected to work, among others. To enable this feature, `LuauTinyControlFlowAnalysis` exclusion has to be removed from `ExperimentalFlags.h`. If will become enabled unconditionally in the near future. * Linter has been integrated into the typechecker analysis so that type-aware lint warnings can work in any mode `Frontend::lint` methods were deprecated, `Frontend::check` has to be used instead with `runLintChecks` option set. Resulting lint warning are located inside `CheckResult`. * Fixed large performance drop and increased memory consumption when array is filled at an offset (Fixes https://github.com/Roblox/luau/issues/590) * Part of [Type error suppression RFC](https://github.com/Roblox/luau/blob/master/rfcs/type-error-suppression.md) was implemented making subtyping checks with `any` type transitive. --- In our work on the new type-solver: * `--!nocheck` mode no longer reports type errors * New solver will not be used for `--!nonstrict` modules until all issues with strict mode typechecking are fixed * Added control-flow aware type refinements mentioned earlier In native code generation: * `LOP_NAMECALL` has been translated to IR * `type` and `typeof` builtin fastcalls have been translated to IR/assembly * Additional steps were taken towards arm64 support
89 lines
3.2 KiB
C++
89 lines
3.2 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/Def.h"
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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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void inheritRefinements(const ScopePtr& childScope);
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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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