[CU]callback机制2-子类继承父类的callback机制

背景:对旧的验证平台升级,新旧验证平台基本一致,只是需要扩展my_driver的功能,从其派生出新类new_driver; 此外,旧的验证平台中大量使用了callback机制; 怎么处理才能使原来的callback函数/任务能够用于new_driver中呢?

 

class new_driver extends my_driver;
    `uvm_component_utils(new_driver)
    `uvm_set_super_type(new_driver,my_driver)
    ...
endclass

task new_driver::main_phase(uvm_phase phase);
    ...
    while(1) begin
        seq_item_port.get_next_item(req);
        `uvm_do_callbacks(my_driver,A,pre_trans(this,req))
        drive_one_pkt(req);
        seq_item_port.item_done();
    end
endtask

//my_agent.sv
function void my_agent::build_phase(uvm_phase phase);
        super.build_phase(phase);
        if(is_active==UVM_ACTIVE) begin
            sqr=my_sequencer::type_id::create("sqr",this);
            drv=new_driver::type_id::create("drv",this);
        end
        mon=my_monitor::type_id::create("mon",this);
endfunction