Report catcher to remove UVM_WARNINGs

UVM
,
1

I am trying to use Report catcher to shut out UVM_WARNINGS coming from RAL.

Please find relevant code below.

function uvm_report_catcher::action_e fb_report_catcher::catch();
    string ID       = get_id();
    string MSG      = get_message();

    foreach(chg_q[i]) begin
        if(ID.match(chg_q[i].ID) && MSG.match(chg_q[i].MSG) && (get_severity == chg_q[i].incoming_severity)) begin
            set_severity(chg_q[i].outgoing_severity);
            set_verbosity(chg_q[i].outgoing_verbosity);
            break;
        end
    end
    return THROW;
endfunction

chg_severity(string ID = "", string MSG ="", uvm_severity incoming_severity = UVM_WARNING, uvm_severity outgoing_severity = UVM_INFO, uvm_verbosity outgoing_verbosity = UVM_DEBUG);
  change_sev_s data;
  data.ID                  = ID; 
  data.MSG                 = MSG;
  data.incoming_severity   = incoming_severity; 
  data.outgoing_severity   = outgoing_severity; 
  data.outgoing_verbosity  = outgoing_verbosity; 
  chg_q.push_back(data);
endfunction


report_catcher::chg_severity("RegModel",,,,);
report_catcher::chg_severity("RegModel",,UVM_INFO,,);

I already made sure that functions works as expected by putting $displays there, so not a good place to spend your time there.

It does not deal with UVM_WARNING at all and I see WARNINGs from that module being printed anyways.

  1. My expectation here was that UVM_WARNING will be demoted to UVM_INFO with verbosity UVM_DEBUG and will be filtered out. Why did it not work?
  2. If I just want to remove intended UVM_WARNINGs, how can I modify catch function. Maybe I dont return THROW?
2

In reply to sharatk:
Waht are you doing wuth your catcher? You have modified the catch method and you have to add your catcher to your environment.

3

In reply to sharatk:

Maybe I dont return THROW?

Return CAUGHT, conditionally when its a UVM_WARNING otherwise THROW. That works in a toy example. You can also add/try return CAUGHT if you convert a warning to info and a specific verbosity, and then return caught if the overall verbosity level is lower than the converted verbosity level. That I have not tried in my toy example.

class my_report_catcher extends uvm_report_catcher;
  `uvm_object_utils(my_report_catcher)
  typedef struct {
   string id;
   uvm_severity in_sev;
   uvm_severity out_sev;
   uvm_verbosity out_verb;
  } req_s;
  req_s reqs[$];
  
  function new(string name = "mrc");
    super.new(name);
  endfunction
  
  function void add_req(req_s r);
    reqs.push_back(r);
  endfunction
  
  function action_e catch();
    bit nothrow=0;
    string loc_id=get_id();
    uvm_severity loc_sev=get_severity();
    foreach(reqs[r]) begin
      if(loc_id==reqs[r].id && loc_sev==reqs[r].in_sev) begin
        set_severity(reqs[r].out_sev);
        if (reqs[r].out_sev==UVM_INFO) set_verbosity(reqs[r].out_verb);
        if (loc_sev==UVM_WARNING) nothrow=1;
        break;
      end
    end
    return nothrow?CAUGHT:THROW;
  endfunction
  
endclass

Then in the env -

my_report_catcher mrc
mrc=new("mrc");
mrc.add_req('{"WARNING_ID", UVM_WARNING, UVM_INFO, UVM_DEBUG});
uvm_report_cb::add(your_agent.your_component, mrc);
4

In reply to ab_verif:

It should be like this:

class my_report_catcher extends uvm_report_catcher; 
  
  function new (string name = "");
    super.new(name);
  endfunction

  function action_e catch; 
    uvm_severity severity  = get_severity();
    string       id        = get_id();
    uvm_action   action    = get_action();
    string       message   = get_message();
    int          verbosity = get_verbosity();

    if (severity == UVM_WARNING)
      set_severity(UVM_INFO);  // demoting

    if (severity == UVM_ERROR)
      return CAUGHT;         //caught UVM_ERROR

    return THROW;            // through to ther catchers
  endfunction

endclass

And then in the env:

function void end_of_elaboration_phase(uvm_phase phase);
  catcher_h = new("catcher_h");
  uvm_report_cb::add(null, catcher_h);
endfunction
5

Thanks all. I used CAUGHT to prevent WARNING from showing up. Is this a UVM issue of setting VERBOSITY to UVM_NONE even when I ask it to set to UVM_DEBUG?