uvm:8.4.2 to create a class from a string

1.factory a parameterized class is required to create a class based on a string:

2. When defining a Class (My_driver), declare a corresponding registry class and its variables:

1) When creating an instance, place the pointer of the instance and the name "My_driver" in a union array global_tab.

2) The above basic is Uvm_*_utils macro implementation of the function, just uvm_*_utils macro to do more, better.

3) Me=new () should be just for name, not for real in-memory instances.

3. When you want to create an instance of My_driver based on the class name "My_driver", first find the pointer to the registry# (My_driver, My_driver) instance of the "My_driver" index from Global_tab me_ptr , and then call the Me_ptr.inst = new () function, and eventually return to Me_ptr.inst. The process is as follows:

Basically, it's just that the real implementation is much more complicated than this.

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uvm:8.4.2 to create a class from a string