CODEWITHSUNDEEP
macrosconcatenationverilogsystem-verilog
U.C.
U.C.

Reputation: 11

How to make a task call name using macro concatenation in SystemVerilog?

In my SystemVerilog test, I'm trying to make a task call name by using macros.

If AAA_BLK is defined, I want the task call name replaced as test_aaa_proc();, and the same way for BBB_BLK and CCC_BLK.

`ifdef AAA_BLK
  `define BLK_NAME aaa
`elsif BBB_BLK
  `define BLK_NAME bbb
`elsif CCC_BLK
  `define BLK_NAME ccc
`endif

task test_aaa_proc();
...
endtask

task test_bbb_proc();
...
endtask

task test_ccc_proc();
...
endtask

virtual task body();
  test_``BLK_NAME``_proc ();
endtask

But, it fails with below errors. Would you please advise?

        test_``BLK_NAME``_proc ();
              |
xmvlog: *E,EXPCPD 
 expecting a valid compiler directive [16(IEEE)].
        test_``BLK_NAME``_proc ();
                      |
xmvlog: *E,MISEXX 
 expecting an '=' or '<=' sign in an assignment [9.2(IEEE)].
        test_``BLK_NAME``_proc ();
                        |
xmvlog: *E,EXPCPD 
 expecting a valid compiler directive [16(IEEE)].
        test_``BLK_NAME``_proc ();
                             |
xmvlog: *E,NOTDIR 
 `_proc: not a recognized directive or macro [2.7.3][16.3.1][16(IEEE)].

Upvotes: 1

Views: 182

Answers (1)

toolic
toolic

Reputation: 62045

The `` syntax can only be used in the macro definition, not in the macro call. Refer to IEEE Std 1800-2017, section 22.5.1 `define.

You can create a new macro which will resolve into the task name that you want to call. Then, you can call that new macro from the body task. Here is a complete runnable example:

module tb;

`define AAA_BLK

`ifdef AAA_BLK
  `define BLK_NAME aaa
`elsif BBB_BLK
  `define BLK_NAME bbb
`elsif CCC_BLK
  `define BLK_NAME ccc
`endif

`define TEST_TASK(block)  test_``block``_proc

task test_aaa_proc();
    $display("%m");
endtask

task test_bbb_proc();
    $display("%m");
endtask

task test_ccc_proc();
    $display("%m");
endtask

task body();
    `TEST_TASK(`BLK_NAME);
endtask

initial body();

endmodule

This prints:

tb.test_aaa_proc

Upvotes: 0

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