02 身部之構造

身部才是執行動作所必要者

Win32Forth 詞之基本構造如下:

\ BFA: MSB 8  128  IMMEDIATE flag

\          7   64  DEPRECATED flag

\          6   32  unused

\          5   16  unused

\          4    8  unused

\          3    4  OFA set if OFA is present

\          2    2  FFA set if FFA is present

\      LSB 1    1  VFA set if VFA is present

128 constant BFA_IMMEDIATE    \ bit of header's field BFA : true if word is immediate

 64 constant BFA_DEPRECATED   \ bit of header's field BFA : true if word is deprecated

 32 constant BFA_UNUSED3

 16 constant BFA_UNUSED2

  8 constant BFA_UNUSED1

  4 constant BFA_OFA_PRESENT  \ bit of header's field BFA : true if optimize field present

  2 constant BFA_FFA_PRESENT  \ bit of header's field BFA : true if file field present

  1 constant BFA_VFA_PRESENT  \ bit of header's field BFA : true if view field present