Controlling sequence library distibution

Hi All, 

I have a question about controlling sequence library distibution. I would like to give the test writer the ability to control sequences distribution. For that i am  using the uvm_sequence_library class. I saw that the index of a sequence in the library is determined by the order of sequence registration to the library (using `uvm_add_to_seq_lib macro). but this raises problem when removing sequences for example:

Project1 :

Sequence lib code:

constratint select_sequence_c { select_rand dist {   0:=20, // sequence_A

1:=100, // sequence_B

2:=20  // sequence_C

};}

The test owner would like to override the default distribution so in the test there is the following constraint layering:

constratint select_diff_dist { select_rand dist {  /*0:=20, // sequence_A*/

1:=30, // sequence_B

2:=30  // sequence_C

};}

Next project . Project2 does not include sequence A anymore so it was removed from the sequence library . Sequence index is now shifted.

constratint select_sequence_c { select_rand dist {  

0:=100, // sequence_B

1:=20  // sequence_C

};}

Now the test should be changed since index 1 does not point to sequence B anymore ( and so on…):

constratint select_diff_dist { select_rand dist {

1:=30, // sequence_B

2:=30  // sequence_C

};}

In OVM we used string based hash which is now deprecated:

constraint select_seq seq_kind dist {seq_kind dist Get_seq_kind(“sequence_A”) :=20,

seq_kind dist Get_seq_kind(“sequence_B”) :=20,

seq_kind dist Get_seq_kind(“sequence_C”) :=20};

}

Any idea how to solve this?

Thanks, 

Ilan