problem about using type_id::create()

[mrforever]

Hi, experts,

I met one problem when i use type_id::create() to create one instance of a component object.

Here are my codes:

 

typedef class tmp_for_test;

 

class config_agent extends uvm_agent;

  typedef config_agent this_type;

 

    tmp_for_test #(int, byte) tmp_f_t;

 

  // Provide implmentations of virtual methods such as get_type_name and create

  `uvm_component_utils_begin(config_agent)

    `uvm_field_object(tmp_f_t, UVM_DEFAULT);

  `uvm_component_utils_end

 

  // new

  function new (string name, uvm_component parent);

    super.new(name, parent);

  endfunction : new

 

  // build_phase

  function void build_phase(uvm_phase phase);

    super.build_phase(phase);

    ...

    tmp_f_t = tmp_for_test#(int, byte)::type_id::create("tmp_f_t", this);

    ...

  endfunction: build_phase

  ...

endclass: config_agent

 

class tmp_for_test #(type T1=int, type T2=T1) extends uvm_component;

  T1 width;

  T2 depth;

  // Provide implmentations of virtual methods such as get_type_name and create

  `uvm_component_utils(tmp_for_test)

    

  function new (string name, uvm_component parent);

    super.new(name, parent);

    ...

  endfunction

      

  function void build_phase(uvm_phase phase);

    super.build_phase(phase);

  endfunction: build_phase

  ...

endclass : tmp_for_test

 

The VCS reports such an error:

 

Error-[sV-ICA] Illegal class assignment

../sv_for_tmptest/02_master/config/config_agent.sv, 254

"this.tmp_f_t = uvm_pkg_uvm_component_registry_541795153::create("tmp_f_t", this, "\000");"

  Expression 'uvm_pkg_uvm_component_registry_541795153::create("tmp_f_t", 

  this, "\000")' on rhs is not a class or a compatible class and hence cannot  

  be assigned to a class handle on lhs. 

  Please make sure that the lhs and rhs expressions are compatible.

 

But it's okay when i use config_driver which extends uvm_driver replacing the class tmp_for test. Does anybody meet the same problem or know the reason?

 

Thanks in advance

[mrforever]

Hi, all

I have found the reason of this problem. It's that the type of the second paramter(byte type) of class tmp_for_test isn't identify with the defaut type, which is int type. If change the type of the second paramter from byte to int, the error disappears. But I have another question: If I want to use different type of the paramter of class tmp_for_test and instantiate it via the way of using type_id::create("tmp_f_t", this), how can i do?

 

regards

mrforever

[apfitch]

You need to use the macros  `uvm_component_param_utils*

 

See the class reference for details,

regards

 

Alan

[mrforever]

You need to use the macros  `uvm_component_param_utils*

 

See the class reference for details,

regards

 

Alan

Thanks, Alan. I will have a try.

[mrforever]

You need to use the macros  `uvm_component_param_utils*

 

See the class reference for details,

regards

 

Alansu

 

Thanks, Alan. I have solved it. Could you give me some suggestions about my another question? The subject is "problem about multiple sequencers which have the same name"

 

 

 

 

 

regards

mrforever