UVM Factory and Object Creation

The UVM factory is an essential part of the UVM library, controlling the creation of UVM components and objects. It provides a consistent and flexible way to create and manage these entities. The factory pattern allows users to modify the types of components or objects created without changing the source code. It supports creating, overriding, and aliasing types.

Factory Basics

The UVM factory follows the singleton pattern; there is only one instance of the factory throughout a simulation. Any component or object that needs to be created is requested from the factory, which handles the actual creation.

Type Overrides

The factory allows for type overrides, which is a powerful mechanism that lets users replace the creation of one type of object with another. This is useful in scenarios where a specific test needs a specialized version of a component or object.

Instance Overrides

Instance overrides are similar to type overrides but apply to a specific instance of a component or object. Instance overrides provide even greater flexibility, enabling different behavior for different instances of the same type.