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98 lines
3.8 KiB
C++
98 lines
3.8 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/Error.h"
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#include "Luau/Location.h"
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#include "Luau/TxnLog.h"
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#include "Luau/TypeInfer.h"
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#include "Luau/Module.h" // FIXME: For TypeArena. It merits breaking out into its own header.
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#include <unordered_set>
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namespace Luau
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{
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enum Variance
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{
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Covariant,
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Invariant
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};
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struct UnifierCounters
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{
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int recursionCount = 0;
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int iterationCount = 0;
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};
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struct Unifier
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{
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TypeArena* const types;
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Mode mode;
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ScopePtr globalScope; // sigh. Needed solely to get at string's metatable.
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TxnLog log;
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ErrorVec errors;
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Location location;
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Variance variance = Covariant;
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CountMismatch::Context ctx = CountMismatch::Arg;
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std::shared_ptr<UnifierCounters> counters;
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InternalErrorReporter* iceHandler;
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Unifier(TypeArena* types, Mode mode, ScopePtr globalScope, const Location& location, Variance variance, InternalErrorReporter* iceHandler);
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Unifier(TypeArena* types, Mode mode, ScopePtr globalScope, const std::vector<std::pair<TypeId, TypeId>>& seen, const Location& location,
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Variance variance, InternalErrorReporter* iceHandler, const std::shared_ptr<UnifierCounters>& counters = nullptr);
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// Test whether the two type vars unify. Never commits the result.
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ErrorVec canUnify(TypeId superTy, TypeId subTy);
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ErrorVec canUnify(TypePackId superTy, TypePackId subTy, bool isFunctionCall = false);
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/** Attempt to unify left with right.
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* Populate the vector errors with any type errors that may arise.
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* Populate the transaction log with the set of TypeIds that need to be reset to undo the unification attempt.
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*/
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void tryUnify(TypeId superTy, TypeId subTy, bool isFunctionCall = false, bool isIntersection = false);
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private:
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void tryUnify_(TypeId superTy, TypeId subTy, bool isFunctionCall = false, bool isIntersection = false);
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void tryUnifyPrimitives(TypeId superTy, TypeId subTy);
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void tryUnifyFunctions(TypeId superTy, TypeId subTy, bool isFunctionCall = false);
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void tryUnifyTables(TypeId left, TypeId right, bool isIntersection = false);
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void tryUnifyFreeTable(TypeId free, TypeId other);
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void tryUnifySealedTables(TypeId left, TypeId right, bool isIntersection);
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void tryUnifyWithMetatable(TypeId metatable, TypeId other, bool reversed);
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void tryUnifyWithClass(TypeId superTy, TypeId subTy, bool reversed);
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void tryUnify(const TableIndexer& superIndexer, const TableIndexer& subIndexer);
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public:
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void tryUnify(TypePackId superTy, TypePackId subTy, bool isFunctionCall = false);
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private:
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void tryUnify_(TypePackId superTy, TypePackId subTy, bool isFunctionCall = false);
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void tryUnifyVariadics(TypePackId superTy, TypePackId subTy, bool reversed, int subOffset = 0);
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void tryUnifyWithAny(TypeId any, TypeId ty);
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void tryUnifyWithAny(TypePackId any, TypePackId ty);
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std::optional<TypeId> findTablePropertyRespectingMeta(TypeId lhsType, Name name);
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std::optional<TypeId> findMetatableEntry(TypeId type, std::string entry);
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public:
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// Report an "infinite type error" if the type "needle" already occurs within "haystack"
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void occursCheck(TypeId needle, TypeId haystack);
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void occursCheck(std::unordered_set<TypeId>& seen, TypeId needle, TypeId haystack);
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void occursCheck(TypePackId needle, TypePackId haystack);
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void occursCheck(std::unordered_set<TypePackId>& seen, TypePackId needle, TypePackId haystack);
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Unifier makeChildUnifier();
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private:
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bool isNonstrictMode() const;
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void checkChildUnifierTypeMismatch(const ErrorVec& innerErrors, TypeId wantedType, TypeId givenType);
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[[noreturn]] void ice(const std::string& message, const Location& location);
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[[noreturn]] void ice(const std::string& message);
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};
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} // namespace Luau
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