Calling a print method through the message APIs

[AWhooley]

Hi,

Is it possible to control when the print method of an object is called through the message APIs e.g. 'uvm_info? For example I want to print out the contents of the transaction received by the driver but only when debugging my code. Thus I would like to be able to do the following:

`uvm_info("",$sformatf("Verbosity is %s", tx.print), UVM_DEBUG);

Obviously this does not work. I also tried accessing the enumerated type that UVM_DEBUG belongs to (uvm_verbosity) but it does not look like I can access it. It is possible I trued to access it incorrectly as I did not provide any hierarchical path to it or anything like that.

if (uvm_verbosity == UVM_DEBUG)

tx.print

Anyway what would be the best approach to achieve what I would like to achieve? Should I specify "UVM_NOPRINT" for all the properties in my transaction and then write a do_print function where I print the properties using uvm_info instead?

Thanks

Alan

Edited September 26, 2011 by tzar
Formatting

[mea1201]

Have you tried passing the +UVM_VERBOSITY=UVM_DEBUG plusarg setting through your simulator call? That's one way to set the verbosity level for each simulation run.

[AWhooley]

Hi,

Yes that would let me set the verbosity level to UVM_DEBUG. However my issue is how best to wrap my call to tx.print such that it only runs when the verbosity level is set to UVM_DEBUG.

Thanks

Alan

[uwes]

hi,

for instance:

`uvm_info("KIND",$sformatf("object is %s", tx.sprint()), UVM_DEBUG);

as alternative if more code is required (with some downsides):

   if (uvm_report_enabled(UVM_HIGH)) begin
//

end

[shail]

uvm_report_enabled is method of uvm_report_object and so is available in uvm_component, but not in uvm_transaction or uvm_sequence_item

so in case where you want to print something based on verbosity, there seems to be no way, except you define a function that converts all your prints to a string and returns string...

For example, a sequence item has a payload (dynamic array) of size 1-1000 . Obviously, one would not want to print the whole array every time, but only when verbosity is UVM_DEBUG or UVM_FULL.

one way to do this is

foreach (payload[j]) begin
  `uvm_info(get_type_name(), $sformatf("payload[%d] = 0x%h",j, payload[j]),UVM_FULL)
end

but this would print uvm-message tag in every line and is ugly.. What one would want to do is something like, what we can do for uvm_component .i.e.

from within do_print method of transaction.....
if (uvm_report_enabled(UVM_FULL)) begin
   foreach (data[i]) begin
     printer.print_int($sformatf("data[%d]",i),data[i],$bits(data[i]),UVM_HEX);
   end
end

How can that be done ?

I hope, this is what original user wanted to ask.

[uwes]

hi,

all messaging is done through the context. this is either the component you are in OR via the global context which routes the msg to uvm_root. this means you simply have to pick a component and use uvm_report_enabled(). for a sequence you can use the get_sequencer() for a transaction you could choose anything applicable.if you dont know your real context you may use uvm_root.

/uwe

[shail]

Thanks..

Two questions here:

1) How do I know the context for a uvm_transaction that is flowing through multiple components.(note I do not want to use components uvm_report_enabled() function for a reason.

2) Curious to know, what type of problems could be created if uvm_transaction is extended of uvm_report_object instead of uvm_object in uvm ?