luau/Analysis/include/Luau/TxnLog.h

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// This file is part of the Luau programming language and is licensed under MIT License; see LICENSE.txt for details
#pragma once
#include "Luau/TypeVar.h"
LUAU_FASTFLAG(LuauShareTxnSeen);
namespace Luau
{
// Log of where what TypeIds we are rebinding and what they used to be
struct TxnLog
{
TxnLog()
: originalSeenSize(0)
, ownedSeen()
, sharedSeen(&ownedSeen)
{
}
explicit TxnLog(std::vector<std::pair<TypeId, TypeId>>* sharedSeen)
: originalSeenSize(sharedSeen->size())
, ownedSeen()
, sharedSeen(sharedSeen)
{
}
explicit TxnLog(const std::vector<std::pair<TypeId, TypeId>>& ownedSeen)
: originalSeenSize(ownedSeen.size())
, ownedSeen(ownedSeen)
, sharedSeen(nullptr)
{
// This is deprecated!
LUAU_ASSERT(!FFlag::LuauShareTxnSeen);
}
TxnLog(const TxnLog&) = delete;
TxnLog& operator=(const TxnLog&) = delete;
TxnLog(TxnLog&&) = default;
TxnLog& operator=(TxnLog&&) = default;
void operator()(TypeId a);
void operator()(TypePackId a);
void operator()(TableTypeVar* a);
void rollback();
void concat(TxnLog rhs);
bool haveSeen(TypeId lhs, TypeId rhs);
void pushSeen(TypeId lhs, TypeId rhs);
void popSeen(TypeId lhs, TypeId rhs);
private:
std::vector<std::pair<TypeId, TypeVar>> typeVarChanges;
std::vector<std::pair<TypePackId, TypePackVar>> typePackChanges;
std::vector<std::pair<TableTypeVar*, std::optional<TypeId>>> tableChanges;
size_t originalSeenSize;
public:
std::vector<std::pair<TypeId, TypeId>> ownedSeen; // used to avoid infinite recursion when types are cyclic
std::vector<std::pair<TypeId, TypeId>>* sharedSeen; // shared with all the descendent logs
};
} // namespace Luau