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SV: How to name an unnamed block

SysTom

If I create a variable in a for-loop:

    for(int i=0;i<N;i++) begin...

It creates and unnamed block.  If you $display("%m") in the block it is called "...unmblkX" where is an integer.

If I try to name the block (as allowed in Modelsim)

    for(int i=0;i<N;i++) begin : my_block...

The behavior does not change.  How can I name an unnamed block?

Parents

  • The behavior does change if you move the declaration of the index 'i' into the for loop itself. That is because a local variable declared in a for loop creates its own SystemVerilog scope.

    module my_tb;
      initial
      begin : my_initial_block
        for (int i=0;i<1;i++) begin : my_for_block
          $display("%m");
        end : my_for_block
      end : my_initial_block
    endmodule

    This has the output: my_tb.my_initial_block.unmblk1.my_for_block

    But you can label the for-loop itself. This is probably what you want to do.

    module my_tb;
      initial
      begin : my_initial_block
        for_loop: for (int i=0;i<1;i++) begin : my_for_block
          $display("%m");
        end : my_for_block
      end : my_initial_block
    endmodule

    This has the output: my_tb.my_initial_block.for_loop.my_for_block

Reply

  • The behavior does change if you move the declaration of the index 'i' into the for loop itself. That is because a local variable declared in a for loop creates its own SystemVerilog scope.

    module my_tb;
      initial
      begin : my_initial_block
        for (int i=0;i<1;i++) begin : my_for_block
          $display("%m");
        end : my_for_block
      end : my_initial_block
    endmodule

    This has the output: my_tb.my_initial_block.unmblk1.my_for_block

    But you can label the for-loop itself. This is probably what you want to do.

    module my_tb;
      initial
      begin : my_initial_block
        for_loop: for (int i=0;i<1;i++) begin : my_for_block
          $display("%m");
        end : my_for_block
      end : my_initial_block
    endmodule

    This has the output: my_tb.my_initial_block.for_loop.my_for_block

Children
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