11 May 2014

Improved Macro Support

I’ve noticed two limitations in the way HSW12 handles arguments within macros. These limitations have been resolved as of release HSW12.00.56:

1. It is now possible to use indexed addresses (i.e. “4,X-” or “A,Y”) as single macro argument. In fact any string that is delimited within parenthesis can now be passed to a macro as single argument. Earlier releases would not allow this, because the comma would always be interpreted as argument separator.

Example:

      #MACRO MAC1 1       
      LOOP  CPD   \1       
            BNE   LOOP
      #EMAC       

           ORG   $0000, $000000
            MAC1  $1234
            MAC1  (4,X+)      

Listing:

      000000 000000                 ORG   $0000, $000000
      000000 000000 MACRO           MAC1  $1234
      000000 000000 BC 12 34  LOOP  CPD   \1                      (MAC1)
      000003 000003 26 FB           BNE   LOOP                    (MAC1)
      000005 000005 MACRO           MAC1  (4,X+)
      000005 000005 AC 33     LOOP  CPD   \1                      (MAC1)
      000007 000007 26 FC           BNE   LOOP                    (MAC1)

2. It is now possible to substitute opcodes within macros. Earlier releases of HSW12 only support the substitution of operants.

Example:

      #MACRO MAC2 1       
      LOOP  \1       
            BNE   LOOP
      #EMAC       

      #MACRO MAC3 2       
      LOOP  \1, \2 
            BEQ   LOOP
      #EMAC

            ORG   $0000
            MAC3  MAC2, NOP

Listing:

      000000 0F4000                  ORG   $0000
      000000 0F4000 MACRO            MAC3  MAC2, NOP
      000000 0F4000 MACRO     LOOP   \1, \2                       (MAC3)
      000000 0F4000 A7        LOOP   \1                           (MAC3/MAC2)
      000001 0F4001 26 FD            BNE   LOOP                   (MAC3/MAC2)
      000003 0F4003 27 FB            BEQ   LOOP                   (MAC3)