c-header does not generate code for regfile

[m-kru]

I have a very simple description

addrmap Main {
  default regwidth = 32;

  reg {
    field {sw = rw; hw = r; fieldwidth = 7;}  C1;
    field {sw = rw; hw = r; fieldwidth = 9;}  C2;
    field {sw = rw; hw = r; fieldwidth = 12;} C3;
  } C;

  reg {
    field {sw = r; hw = w; fieldwidth = 7;}  S1;
    field {sw = r; hw = w; fieldwidth = 9;}  S2;
    field {sw = r; hw = w; fieldwidth = 12;} S3;
  } S;

  reg { regwidth = 8; field {sw= rw; hw = r; fieldwidth = 8;} C; } CA[10];
  reg { regwidth = 8; field {sw= r; hw = w; fieldwidth = 8;} C; } SA[10];

  reg { field {sw = r; hw = w; fieldwidth = 32;} Value;} Counter0;
  reg { regwidth = 8; field {sw = r; hw = w; fieldwidth = 1;} Value;} Counter1;

  reg { regwidth = 16; field {sw = rw; hw = r; fieldwidth = 16;} Mask;} Mask;

  reg { field {sw = r; hw = na; fieldwidth = 24;} Version = 0x010102;} Version;

  regfile Subblock {
    reg {
      field {sw = w; hw =r; fieldwidth = 20;} A;
      field {sw = w; hw =r; fieldwidth = 10;} B;
    } Add0;
    reg {
      regwidth = 8;
      field {sw = w; hw =r; fieldwidth = 8; swacc;} C;
    } Add1;
    reg { field {sw = r; hw = w; fieldwidth = 20;} Sum;} Sum;

  };
};

When I generate header file using peakrdl c-header bus.rdl -o bus.h command, there is no code related to the Subblock regfile in the generated header file.