UVM factory mechanism

factory Operation steps of the mechanism

1、 Transfer user-defined classes to factory Register in the registry of .
2、 To use “class_name::type_id::create()" Instead of new Instantiate objects .
3、 Add replacement entries to the replacement table according to specific requirements .
4、 When running the simulation ,UVM It will be automatically realized according to these two tables factory Mechanism .

factory Use of mechanism

1、 Use `uvm_object_utils() Yes uvm_object Class to register .

2、 Use `uvm_component_utils() Yes uvm_component Class to register .
3、 Use “class_name::type_id::create()" Instead of new Instantiate objects .

If you need to register a parameterized class, you need to use
`uvm_object_param_utils()

`uvm_component_param_utils()

factory The mechanism and override Mechanism

A combination of the two ,override Mechanism to factory Add a replacement item to the replacement list of .
In this Blog Based on the code , expand my_test, Implementation class replacement , The code is as follows ：

class my_test_type_da3 extends my_test;

    `uvm_component_utils(my_test_type_da3)

    function new(string name = "", uvm_component parent);
        super.new(name, parent);
    endfunction

    virtual function void build_phase(uvm_phase phase);
        super.build_phase(phase);
        set_type_override_by_type(my_transaction::get_type(), my_transaction_da3::get_type());
    endfunction

    virtual function void report_phase(uvm_phase phase);
        super.report_phase(phase);
        factory.print();
    endfunction

endclass

Replace only one object in the platform , Examples are as follows

class my_test_inst_da3 extends my_test;

    `uvm_component_utils(my_test_inst_da3)

    function new(string name = "", uvm_component parent);
        super.new(name, parent);
    endfunction

    virtual function void build_phase(uvm_phase phase);
        super.build_phase(phase);
        set_inst_override_by_type("m_env.m_agent.m_seqr.*", my_transaction::get_type(), my_transaction_da3::get_type());
    endfunction

    virtual function void report_phase(uvm_phase phase);
        super.report_phase(phase);
        factory.print();
    endfunction

endclass

Be careful

1、 Users need to register with the registry .
2、 Users need to add items to the replacement table .
3、 The type of the replaced object is the base class of the replaced object type .