uvm_cmdline_processor

无意中看到uvm_cmdline_processor，之前使用+UVM_TESTNAME也没深究，现在记录一下

内部调用脚本中的参数，通过使用uvm_cmdline_processor可以从脚本层级，从外部向仿真环境传递参数

get_arg_value( string match, ref string value )
Function:
        get_arg_value

This function finds the first argument which matches the match arg and
returns the suffix of the argument. This is similar to the $value$plusargs
system task, but does not take a formating string. The return value is
the number of command line arguments that match the match string, and
value is the value of the first match.

使用例子：

uvm_cmdline_processor clp = uvm_cmdline_processor::get_inst();

等价于：

uvm_cmdline_processor clp;

clp=new();

 1 program automatic test;
 2 import uvm_pkg::*;
 3
 4 class hello_world extends uvm_test;
 5
 6 uvm_cmdline_processor clp;
 7 int arg_value;
 8 string arg;
 9
10 `uvm_component_utils(hello_world);
11
12   function new (string name, uvm_component parent);
13    super.new(name, parent);
14    clp=new();
15    if(clp.get_arg_value("+arg_value=",this.arg)) begin
16      this.arg_value=this.arg.atoi();
17      `uvm_info("test_arg", $sformatf("input value = %d", arg_value), UVM_DEBUG);
18    end
19    else begin
20   `uvm_info("test_arg", "no input arg_value", UVM_DEBUG);
21    end
22
23   endfunction
24
25 endclass
26
27 initial begin
28   run_test();
29 end
30
31 endprogram

运行：
./simv +UVM_TESTNAME=hello_world +UVM_VERBOSITY=UVM_DEBUG +arg_value=100

结果：

UVM_INFO hello.sv(19) @ 0: uvm_test_top [test_arg] input value =         100