Incompatible data types when using a package

OVM
1

I’m attempting to modularize my testbench using packages but am getting this error during compile:

pbist_agent = PbistAgent::type_id::create("pbist_agent", this);
                                                            |

ncvlog: *E,TYCMPAT (…/tb/pbistEnv.sv,23|64): formal and actual do not have assignment compatible data types (expecting datatype compatible with ‘class ovm_component’ but found ‘class PbistBaseEnv’ instead).
module worklib.pbist_tb
errors: 1, warnings: 0

(The ‘|’ in the error message is pointing to the “this” portion in the line of code in case it doesn’t format correctly).

This testbench compiled and ran just fine before when I just `included everything. I put the code/files associated with the PbistAgent (agent,driver and sequencer) into a package construct, precompiled it and then imported it into the top level testbench module.

PbistBaseEnv is derived from ovm_env which is derived from ovm_component so what am I missing? I’m suspecting that it has to do with the package since the scoreboard create line doesn’t get flagged. The PbistAgent constructor is the standard constructor that is passed (string name, ovm_component parent) and calls super.new(name,parent).

Here’s some more of the code that may be relevant:

class PbistBaseEnv extends ovm_env;

PbistAgent pbist_agent;
PbistScoreboard pbist_scoreboard;

`ovm_component_utils(PbistBaseEnv)

function new (string name, ovm_component parent);
super.new(name, parent);
endfunction : new

function void build();
super.build();
pbist_agent = PbistAgent::type_id::create(“pbist_agent”, this);
pbist_scoreboard = PbistScoreboard::type_id::create(“pbist_scoreboard”, this);
endfunction : build
.
.
.

Using ncvlog 08.20-s009.

Thanks!
Pat

2

I’ve been trying different things and have gotten my test to compile and run when using a single command that includes the package source files as well as the rest of the test environment and DUT. But I thought that packages could/should be precompiled ahead of time.

Pat

3

Hi,

You may be assigning incompatible data types in the new function of pbist_agent.
can you post some sample code of your pbist_agent.

pbist_agent = PbistAgent::type_id::create(“pbist_agent”, this);
|
ncvlog: *E,TYCMPAT (…/tb/pbistEnv.sv,23|64): formal and actual do not have assignment compatible data types (expecting datatype compatible with ‘class ovm_component’ but found ‘class PbistBaseEnv’ instead).
module worklib.pbist_tb
errors: 1, warnings: 0
(The ‘|’ in the error message is pointing to the “this” portion in the line of code in case it doesn’t format correctly).

Thank you,
mpurna.

4

You may want to check out my recent blog about packages, imports, and `includes : http://go.mentor.com/package-import-versus-include

Dave

5

This may not be relevant to your situation, but I faced a similar error message because I forgot to register the data type using `ovm_object_utils(<class_name>).

Thanks,

Edmond