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。
virtual class test_base extends uvm_test;
ahb_agent ahb0;
ahb_agent ahb1;
function new(string name, uvm_component parent);
super.new(name, parent);
endfunction
virtual function void build_phase(uvm_phase phase);
ahb0 = ahb_agent::type_id::create("ahb0", this);
ahb1 = ahb_agent::type_id::create("ahb1", this);
endfunction
endclass
class test1 extends test_base;
`uvm_component_utils(test1)
main_ahb_sequence seq;
ahb_agent agent;
function new(string name, uvm_component parent);
super.new(name, parent);
endfunction
function void build_phase(uvm_phase phase);
seq = main_ahb_sequence::type_id::create("seq", this);
endfunction
task run_phase(uvm_phase phase);
super.run_phase(phase);
phase.raise_objection(this);
seq.start(ahb0.sequencer);
phase.drop_objection(this);
endtask
// ...
执行后，我收到了NULL指针错误：
xmsim: *E,TRNULLID: NULL pointer dereference.
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.
virtual class test_base extends uvm_test;
ahb_agent ahb0;
ahb_agent ahb1;
function new(string name, uvm_component parent);
super.new(name, parent);
endfunction
virtual function void build_phase(uvm_phase phase);
ahb0 = ahb_agent::type_id::create("ahb0", this);
ahb1 = ahb_agent::type_id::create("ahb1", this);
endfunction
endclass
class test1 extends test_base;
`uvm_component_utils(test1)
main_ahb_sequence seq;
ahb_agent agent;
function new(string name, uvm_component parent);
super.new(name, parent);
endfunction
function void build_phase(uvm_phase phase);
seq = main_ahb_sequence::type_id::create("seq", this);
endfunction
task run_phase(uvm_phase phase);
super.run_phase(phase);
phase.raise_objection(this);
seq.start(ahb0.sequencer);
phase.drop_objection(this);
endtask
/*
virtual function void end_of_elaboration_phase(uvm_phase phase);
uvm_config_db #(uvm_object_wrapper)::set(this, "ahb0.sequencer.run_phase",
"default_sequence", main_ahb_sequence::get_type());
uvm_config_db #(uvm_object_wrapper)::set(this, "ahb1.sequencer.run_phase",
"default_sequence", main_ahb_sequence::get_type());
endfunction
*/
After execute, I get the NULL pointer Error
xmsim: *E,TRNULLID: NULL pointer dereference.
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：
class test1 extends test_base;
`uvm_component_utils(test1)
main_ahb_sequence seq;
ahb_agent agent;
function new(string name, uvm_component parent);
super.new(name, parent);
endfunction
function void build_phase(uvm_phase phase);
super.build_phase(phase);
seq = main_ahb_sequence::type_id::create("seq", this);
endfunction
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:
class test1 extends test_base;
`uvm_component_utils(test1)
main_ahb_sequence seq;
ahb_agent agent;
function new(string name, uvm_component parent);
super.new(name, parent);
endfunction
function void build_phase(uvm_phase phase);
super.build_phase(phase);
seq = main_ahb_sequence::type_id::create("seq", this);
endfunction
That will eliminate the NULL pointer dereference error.
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