How to access class parameters based on string access?

SystemVerilog
1

Hello Folks,

Any idea/technique to access the class variables using string based access ? I tried below example to print the value of variables inside the class but instead it prints the string…


module print_loop;
 static int stat_cnt = 0; 
 string mux_ctrl_str;

class mux_ctrl_string;
    static int fruit0_slice0 = 10;
    static int fruit0_slice1 = 20;
    static int fruit0_slice2 = 30;
    static int fruit0_slice3 = 50;
endclass: mux_ctrl_string

mux_ctrl_string config_xtn;

initial begin
    $display("Value of Stat_cnt = %d\n", stat_cnt);
    $display("%h",stat_counter());    
    $display("Value of Stat_cnt = %d\n", stat_cnt);
    $display("%h",stat_counter());    
    $display("Value of Stat_cnt = %d\n", stat_cnt);
    $display("%h",stat_counter());    
    $display("Value of Stat_cnt = %d\n", stat_cnt);
    $display("%h",stat_counter());    
end


function bit [31:0] stat_counter();
  bit [31:0] stat_cnt_val_loc;
  for (int i=0; i<32; i=i+4) begin 
    if (stat_cnt==13) stat_cnt=0;
    stat_cnt_val_loc[i+:4] = stat_cnt;
    stat_cnt++;
  end 
  return (stat_cnt_val_loc);
endfunction: stat_counter


initial begin
for (int k=0; k<1; k++) begin
   for (int j=0; j<4; j++) begin
       $sformat(mux_ctrl_str, "config_xtn.fruit%0d_slice%0d", k ,j);
       $display(mux_ctrl_str); 
   end
 end
end

endmodule: print_loop

Output:

Value of Stat_cnt =           0

76543210
Value of Stat_cnt =           8

210cba98
Value of Stat_cnt =           3

a9876543
Value of Stat_cnt =          11

543210cb
config_xtn.fruit0_slice0
config_xtn.fruit0_slice1
config_xtn.fruit0_slice2
config_xtn.fruit0_slice3

Thought it will print the values 10,20,30,50 but instead it prints the string as a whole… How to solve such scenarios ?

2

In reply to desperadorocks:
You cannot use a string expression to reference a variable identifier. You should be thinking in terms of arrays, not individual variables.

3

In reply to dave_59:

@Dave : Thanks for the clarification. But if a class packet is having 100’s of such individual variable with name extensions, in that case what would be the best possible approach to access those variables ? apart from arrays …

4

In reply to desperadorocks:

The best possible approach would be to change the requirements that got you into this situation.

5

You can use this library, but it’s in the alpha stage, contains no documentation and no support. Also, it’s not tested on all simulators.