如何启动继承的uvm_test类？

huangapple
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英文:

How do I start inherited uvm_test class?

问题

我试图使用.start()方法而不是uvm_config_db()来启动一个UVM测试类。

我已经注释掉了uvm_config_db方法，并改为实现run_phase()如下所示。

  1. virtual class test_base extends uvm_test;
  2.   ahb_agent ahb0;
  3.   ahb_agent ahb1;
  5.   function new(string name, uvm_component parent);
  6.     super.new(name, parent);
  7.   endfunction
  9.   virtual function void build_phase(uvm_phase phase);
  10.     ahb0 = ahb_agent::type_id::create("ahb0", this);
  11.     ahb1 = ahb_agent::type_id::create("ahb1", this);
  12.   endfunction
  13. endclass
  15. class test1 extends test_base;
  16.   `uvm_component_utils(test1)
  17.   main_ahb_sequence seq;
  18.   ahb_agent agent;
  19.   function new(string name, uvm_component parent);
  20.     super.new(name, parent);
  21.   endfunction
  23.   function void build_phase(uvm_phase phase);
  24.     seq = main_ahb_sequence::type_id::create("seq", this);
  25.   endfunction
  27.   task run_phase(uvm_phase phase);
  28.     super.run_phase(phase);
  29.     phase.raise_objection(this);
  31.     seq.start(ahb0.sequencer);
  33.     phase.drop_objection(this);
  34.   endtask
  35.   // ...

执行后，我收到了NULL指针错误：

  1. xmsim: *E,TRNULLID: NULL pointer dereference.
  2.           File: ./test1.svh, line = 42, pos = 17

我认为这是因为test_base类没有被构造好。但是，我不知道如何启动继承的测试类？

我在https://www.edaplayground.com/x/JymT 中实现了这一点。

英文:

I'm trying to start a uvm test class with .start() method instead uvm_config_db().

I commented out the uvm_config_db method and implemented run_phase() instead as below.

  1. virtual class test_base extends uvm_test;
  2.   ahb_agent ahb0;
  3.   ahb_agent ahb1;
  5.   function new(string name, uvm_component parent);
  6.     super.new(name, parent);
  7.   endfunction
  9.   virtual function void build_phase(uvm_phase phase);
  10.     ahb0 = ahb_agent::type_id::create("ahb0", this);
  11.     ahb1 = ahb_agent::type_id::create("ahb1", this);
  12.   endfunction
  13. endclass
  15. class test1 extends test_base;
  16.   `uvm_component_utils(test1)
  17.    main_ahb_sequence seq;
  18.    ahb_agent agent;
  19.   function new(string name, uvm_component parent);
  20.     super.new(name, parent);
  21.   endfunction
  23.   function void build_phase(uvm_phase phase);
  24.     seq = main_ahb_sequence::type_id::create("seq", this);
  25.   endfunction
  28.   task run_phase(uvm_phase phase);
  29.     super.run_phase(phase);
  30.     phase.raise_objection(this);
  32.     seq.start(ahb0.sequencer);
  34.     phase.drop_objection(this);
  35.   endtask
  37. /*
  38.   virtual function void end_of_elaboration_phase(uvm_phase phase);
  39.     uvm_config_db #(uvm_object_wrapper)::set(this, "ahb0.sequencer.run_phase",
  40.       "default_sequence", main_ahb_sequence::get_type());
  41.     uvm_config_db #(uvm_object_wrapper)::set(this, "ahb1.sequencer.run_phase",
  42.       "default_sequence", main_ahb_sequence::get_type());
  43.   endfunction
  44. */

After execute, I get the NULL pointer Error

  1. xmsim: *E,TRNULLID: NULL pointer dereference.
  2.           File: ./test1.svh, line = 42, pos = 17

I think this caused by test_base class not being constructed as well. But, I don't know how to start the inherited test class?

I implemented this in https://www.edaplayground.com/x/JymT

答案1

得分: 1

该错误指向顺序控制器的句柄：ahb0.sequencer。这意味着代理尚未被构建。

您需要在扩展的测试类的build_phase函数中调用super.build_phase：

  1. class test1 extends test_base;
  2.   `uvm_component_utils(test1)
  3.   main_ahb_sequence seq;
  4.   ahb_agent agent;
  6.   function new(string name, uvm_component parent);
  7.     super.new(name, parent);
  8.   endfunction
  10.   function void build_phase(uvm_phase phase);
  11.     super.build_phase(phase);
  12.     seq = main_ahb_sequence::type_id::create("seq", this);
  13.   endfunction
  14. endclass

这将消除NULL指针解引用错误。

英文:

The error points to the handle of the sequencer: ahb0.sequencer. This means the agent has not been constructed.

You need to call super.build_phase in the extended test class build_phase function:

  1. class test1 extends test_base;
  2.   `uvm_component_utils(test1)
  3.    main_ahb_sequence seq;
  4.    ahb_agent agent;
  5.   function new(string name, uvm_component parent);
  6.     super.new(name, parent);
  7.   endfunction
  9.   function void build_phase(uvm_phase phase);
  10.     super.build_phase(phase);
  11.     seq = main_ahb_sequence::type_id::create("seq", this);
  12.   endfunction

That will eliminate the NULL pointer dereference error.

huangapple
  • 本文由 发表于 2023年3月15日 18:05:24
  • 转载请务必保留本文链接：https://go.coder-hub.com/75743192.html
  • system-verilog
  • uvm
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