Avoid creating copy of the object

libyul/Object.cpp

@@ -192,9 +192,8 @@ std::vector<size_t> Object::pathToSubObject(YulString _qualifiedName) const
 	return path;
 }
 
-std::shared_ptr<Object> Object::subObjectAt(std::string const& _qualifiedName)
+Object const* Object::subObjectAt(std::string const& _qualifiedName)
 {
-
 	if (_qualifiedName.empty())
 		return nullptr;
 
@@ -206,11 +205,11 @@ std::shared_ptr<Object> Object::subObjectAt(std::string const& _qualifiedName)
 	if (targetObjectPos != std::string::npos)
 		targetObjectName = _qualifiedName.substr(targetObjectPos + 1);
 
-	std::shared_ptr<Object> foundObject = nullptr;
+	Object const* foundObject = nullptr;
 	this->visitPath(YulString(_qualifiedName), [&](Object const* _subObject) -> bool {
 		if (targetObjectName == _subObject->name.str())
 		{
-			foundObject = std::make_shared<Object>(*_subObject);
+			foundObject = _subObject;
 			return true;
 		}
 		return false;

libyul/Object.h

@@ -118,8 +118,8 @@ public:
 	std::vector<size_t> pathToSubObject(YulString _qualifiedName) const;
 
 	/// Searches for a subobject at @param _qualifiedName within the current object.
-	/// @returns a shared_ptr to the subobject or a nullptr if it was not found.
-	std::shared_ptr<Object> subObjectAt(std::string const& _qualifiedName);
+	/// @returns a pointer to the subobject or a nullptr if it was not found.
+	Object const* subObjectAt(std::string const& _qualifiedName);
 
 	/// Visits all subobjects in the path given by the @a _qualifiedName
 	/// of the current object applying the function @a _visitor.

test/tools/yulopti.cpp

@@ -253,7 +253,7 @@ public:
 	{
 		if (!m_inputIsCodeBlock)
 		{
-			shared_ptr<Object> subObject = m_object->subObjectAt(_objectPath);
+			Object const* subObject = m_object->subObjectAt(_objectPath);
 
 			if (subObject == nullptr)
 				solThrow(Exception, "Assembly object not found.");