Additional Syntax Rules

These rules pertain to labels, comments, structures, and global variables:

• Each label must end with a colon; labels may contain the @ character. For example, x1: and @x2: would be valid labels, but x3 would not - it lacks a colon.
• Comments must use C/ C++ syntax: either starting with double slash characters ( // ) or enclosed by slash and asterisk characters ( /* ... */ ).
• To refer to a field in a structure, use the struct construct:

    struct(structTypeName.fieldName) structAddress
  

  For example, suppose that A0 points to structure WindowRecord. This instruction moves the structure's refCon field to D0:

    move.l  struct(WindowRecord.refCon) (A0), D0
  

• To refer to a global variable, merely use its name, as in the statement

    move.w      x,d0    // Move x into d0