Change Type::type_aliases map to store IntrusivePtr

And deprecate Type::GetAliases() and Type::AddAlias() since they
took raw pointers.  Now replaced with Type::Aliases() and
Type::RegisterAlias().

NEWS

@@ -134,6 +134,9 @@ Deprecated Functionality
 - Marked the Continuation.h and PacketDumper.h files as deprecated. The code
   contained within them is unused by Zeek.
 
+- ``Type::GetAliases()`` and ``Type::AddAlias()`` are deprecated, use
+  ``Type::Aliases()`` and ``Type::RegisterAlias()``.
+
 Zeek 3.2.0
 ==========
 

src/Type.cc

@@ -1348,13 +1348,11 @@ void EnumType::CheckAndAddName(const string& module_name, const char* name,
 	if ( vals.find(val) == vals.end() )
 		vals[val] = make_intrusive<EnumVal>(IntrusivePtr{NewRef{}, this}, val);
 
-	set<Type*> types = Type::GetAliases(GetName());
-	set<Type*>::const_iterator it;
+	const auto& types = Type::Aliases(GetName());
 
-	for ( it = types.begin(); it != types.end(); ++it )
-		if ( *it != this )
-			(*it)->AsEnumType()->AddNameInternal(module_name, name, val,
-							     is_export);
+	for ( const auto& t : types )
+		if ( t.get() != this )
+			t->AsEnumType()->AddNameInternal(module_name, name, val, is_export);
 	}
 
 void EnumType::AddNameInternal(const string& module_name, const char* name,

src/Type.h

@@ -270,13 +270,64 @@ public:
 	void SetName(const std::string& arg_name) { name = arg_name; }
 	const std::string& GetName() const { return name; }
 
-	typedef std::map<std::string, std::set<Type*> > TypeAliasMap;
+	struct TypePtrComparer {
+		bool operator()(const TypePtr& a, const TypePtr& b) const
+			{ return a.get() < b.get(); }
+	};
+	using TypePtrSet = std::set<TypePtr, TypePtrComparer>;
+	using TypeAliasMap = std::map<std::string, TypePtrSet, std::less<>>;
 
+	/**
+	 * Returns a mapping of type-name to all other type names declared as
+	 * an alias to it.
+	 */
+	static const TypeAliasMap& GetAliasMap()
+		{ return type_aliases; }
+
+	/**
+	 * Returns true if the given type name has any declared aliases
+	 */
+	static bool HasAliases(std::string_view type_name)
+		{ return Type::type_aliases.find(type_name) != Type::type_aliases.end(); }
+
+	/**
+	 * Returns the set of all type names declared as an aliases to the given
+	 * type name.  A static empty set is returned if there are no aliases.
+	 */
+	static const TypePtrSet& Aliases(std::string_view type_name)
+		{
+		static TypePtrSet empty;
+		auto it = Type::type_aliases.find(type_name);
+		return it == Type::type_aliases.end() ? empty : it->second;
+		}
+
+	[[deprecated("Remove in v4.1. Use zeek::Type::Aliases() instead.")]]
 	static std::set<Type*> GetAliases(const std::string& type_name)
-		{ return Type::type_aliases[type_name]; }
+		{
+		std::set<Type*> rval;
+		for ( const auto& t : Type::type_aliases[type_name] )
+			rval.emplace(t.get());
+		return rval;
+		}
 
+	/**
+	 * Registers a new type alias.
+	 * @param type_name  the name of the type to register a new alias for.
+	 * @param type  the associated alias type of *type_name*.
+	 * @return  true if the alias is now registered or false if the alias was
+	 * already previously registered.
+	 */
+	static bool RegisterAlias(std::string_view type_name, TypePtr type)
+		{
+		auto it = Type::type_aliases.find(type_name);
+		if ( it == Type::type_aliases.end() )
+			it = Type::type_aliases.emplace(std::string{type_name}, TypePtrSet{}).first;
+		return it->second.emplace(std::move(type)).second;
+		}
+
+	[[deprecated("Remove in v4.1. Use zeek::Type::RegisterAlias().")]]
 	static void AddAlias(const std::string &type_name, Type* type)
-		{ Type::type_aliases[type_name].insert(type); }
+		{ Type::type_aliases[type_name].insert({NewRef{}, type}); }
 
 protected:
 	Type() = default;

src/Var.cc

@@ -382,10 +382,10 @@ void add_type(ID* id, TypePtr t, std::unique_ptr<std::vector<AttrPtr>> attr)
 		// Clone the type to preserve type name aliasing.
 		tnew = t->ShallowClone();
 
-	Type::AddAlias(new_type_name, tnew.get());
+	Type::RegisterAlias(new_type_name, tnew);
 
 	if ( new_type_name != old_type_name && ! old_type_name.empty() )
-		Type::AddAlias(old_type_name, tnew.get());
+		Type::RegisterAlias(old_type_name, tnew);
 
 	tnew->SetName(id->Name());
 

src/parse.y

@@ -171,7 +171,7 @@ static void parser_redef_enum (zeek::detail::ID *id)
 static void extend_record(zeek::detail::ID* id, std::unique_ptr<zeek::type_decl_list> fields,
                           std::unique_ptr<std::vector<zeek::detail::AttrPtr>> attrs)
 	{
-	std::set<zeek::Type*> types = zeek::Type::GetAliases(id->Name());
+	const auto& types = zeek::Type::Aliases(id->Name());
 
 	if ( types.empty() )
 		{
@@ -189,7 +189,7 @@ static void extend_record(zeek::detail::ID* id, std::unique_ptr<zeek::type_decl_
 				break;
 				}
 
-	for ( auto t : types )
+	for ( const auto& t : types )
 		{
 		auto error = t->AsRecordType()->AddFields(*fields, add_log_attr);