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  Hierarchical reference not allowed from within a package. 

Last post Thu, Mar 15 2007 2:45 AM by archive. 5 replies.
Started by archive 15 Mar 2007 02:45 AM. Topic has 5 replies and 1972 views
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  • Thu, Mar 15 2007 2:45 AM

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    Hierarchical reference not allowed from within a package. Reply

    Hi All,
    We are trying this kind of example. We are having two files of these. It's giving  "Hierarchical reference  not allowed from within a package." at    class1_instance.class1_function(.....)     class2_instance.class2_function(......)

    I tried passing both classes as members of a structure. but it giving same error when accessing member class functions from structure.

    What's the solution to access functions of these classes in Program main Blocks.

    file1.sv
    _______________________

    program main;

    class1 class1_instance;
    class 2 class2_instance;
    initial begin
        class1_instance=new;
        class2_instance=new;
        call_task_from_other_file(class1_instance, class2_instance);
    end
    endprogram


    file2.sv
    ________________________
    task call_task_from_other_file(class1 class1_instance, class2 class2_instance);
        class1_instance.class1_function(.....)
        class2_instance.class2_function(......)
    endtask




    Regards
    Mayank


    Originally posted in cdnusers.org by mayank
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  • Thu, Mar 15 2007 9:02 AM

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    RE: Hierarchical reference not allowed from within a package. Reply

    A similar code segment worked fine on another simulator, so I would imagine there is some issue with your tool-version. Did you try a later version/patch? Also your error message mentions usage of a package while the code snippet doesn't. Maybe if you post full code someone can help better.

    Regards
    Ajeetha, CVC
    www.noveldv.com


    Originally posted in cdnusers.org by ajeetha
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  • Fri, Mar 16 2007 3:17 AM

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    RE: Hierarchical reference not allowed from within a package. Reply

    Thanks Ajeetha, for your reply. code contains  no package declaration or keyword. Just group of files with `include statements and all in include_path.
    Even it's giving same
    Hierarchical reference  not allowed from within a package." for this type of code also, or when calling  sub_module tasks from class functions.

    interface intf1(input logic clk);
    endinterface

    program main (intf1 intf1_instance);
        forked_task;
    endprogram

    task forked_task
        dut_instance.dut_task;
    endtask

    module dut (intf1 intf1_instance);

        task dut_task;
        endtask

    endmodule


    module top;
        reg clk;
        intf1 intf1_instance (clk);
        dut dut_instance (intf1_instance);
        main main_instance (intf1_instance);
    endmodule


    Originally posted in cdnusers.org by mayank
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  • Fri, Mar 16 2007 10:18 AM

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    RE: Hierarchical reference not allowed from within a package. Reply

    Mayank,
         I will try your code soon on another simulator. But if you were to accept constructive comments - the above code is hard to follow and maintain IMHO. Use of stuff in $root and referencing one from another is a "sphagetti" style that is highly discouraged. Maybe this was a code written to show here in this forum/email,  then it is fine, but be ware when you have to deploy such a code in real life. Refer to a good methodology in your case it can be URM (since you use CDN tools anyway).

    I haven't seen URM much but hopefully it has some TLM flavor a la VMM/AVM thereby keeping things modular.

    Just in case if you are based in Bangalore, my company can help you to appreciate the value of a methodology if needed.

    Regards
    Ajeetha, CVC
    www.noveldv.com  


    Originally posted in cdnusers.org by ajeetha
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  • Fri, Mar 16 2007 10:32 AM

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    RE: Hierarchical reference not allowed from within a package. Reply

    Hello Mayank,

    I created a mini-testcase with the hope of understanding the issue you are running into. I was able to run my mini-test with the IUS5.83s3 release and an early adopter version of IUS6.1. Here is my code. Please try it out and let me know if it runs on your installation. Also - if I have misinterpreted your question, please let me know!

    Thanks!

    Kathleen Meade

    package my_pkg;
    class class1;
    integer v1 = 100;
    function void class1_function ();
    $display("class1_function: v1 is %0d", v1);
    endfunction
    endclass : class1

    class class2;
    integer v2 = 200;
    function void class2_function ();
    $display("class2_function: v2 is %0d", v2);
    endfunction
    endclass : class2

    task call_task_from_other_file (input class1 c1_inst, input class2 c2_inst);
    c1_inst.class1_function();
    c2_inst.class2_function();
    endtask
    endpackage : my_pkg;

    program main;
    import my_pkg::*;
    class1 class1_inst;
    class2 class2_inst;
    initial begin
    class1_inst = new();
    class2_inst = new();
    call_task_from_other_file(class1_inst, class2_inst);
    end
    endprogram


    Originally posted in cdnusers.org by kameade
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  • Fri, Mar 16 2007 10:45 AM

    • archive
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    RE: Hierarchical reference not allowed from within a package. Reply

    Hello Mayank,

    I looked at your second code example. IUS does not yet support declaring tasks/functions in the global space but you would be able to declare the forked_task task in the top module, the main program or in a package. The other issue I see with your code example is that the main program must use an initial block to call the forked_task.

    I hope this helps!

    Kathleen Meade

    Here is a modified version of your second code example that works on the IUS5.83-s3 release:

    interface intf1 (input logic clk);
    endinterface

    program main (intf1 intf1_instance);
    initial forked_task();
    endprogram

    module dut (intf1 intf1_instance);
    task dut_task;
    $display("I am in dut_task");
    endtask
    endmodule

    module top;
    reg clk;
    intf1 intf1_instance (clk);
    dut dut_instance (intf1_instance);
    main main_instance (intf1_instance);
    // this task can be declared in the program, the top module or in a package.
    task forked_task();
    dut_instance.dut_task;
    endtask
    endmodule


    Originally posted in cdnusers.org by kameade
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Started by archive at 15 Mar 2007 02:45 AM. Topic has 5 replies.