These vectors evaluate parameters to SuperBASIC procedures and functions and put them on the maths stack.

• All registers not shown above are not used on entry and are preserved on exit.
• The parameters are stored in the name table between (A3,A6.L) and (A5,A6.L). Thus A5.L points to the end of the last parameter.
• The final value of the maths stack is at (A1,A6.L). The value in A1 is also set in BV_RIP(A6).
• The four routines process the following four types of parameter:
  • GTINT - integer.
  • GTFP - floating point.
  • GTSTR - string.
  • GTLIN - long integer.
• The maths stack is set to its initial position after procedures and after errors in functions. It is up to the programmer to tidy the maths stack after a function.

In this example we need three integer parameters followed by two long integers.

       lea       5*8(a3),a0      ; To check for 5 parameters
       cmpa.l    a0,a5
       bne       bad_parm ---->  ; There were not 5 parameters
       movea.l   a5,a4           ; Keep the pointer to the end of parameters
       lea       3*8(a3),a5      ; Arrange to input 3 parameters
       movea.w   CA_GTINT,a2
       jsr       (a2)            ; Process the parameters
       bne       bad_parm ---->  ; (No need to test D0.L)
       subq.w    #3,d3           ; Three parameters? . .
       bne       bad_parm ---->  ; . . no!
       movem.l   (a1,a6.l),d5-7  ; Extract parameters to D5 to D7
       addq.l    #6,bv_rip(a6)   ; Tidy the maths stack
       movea.l   a5,a3           ; Point to the last two parameters
       movea.l   a4,a5           ; Restore A5
       movea.w   CA_GTLIN,a2
       jsr       (a2)            ; Process the remaining 2 parameters
       bne       bad_parm ---->
       subq.w    #2,d3           ; Two parameters? . .
       bne       bad_parm ---->  ; . . no 
       addq.l    #8,bv_rip(a6)   ; Tidy the maths stack