[fasmg] do purge or restore restores struc definition?

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zhak

Joined: 12 Apr 2005
Posts: 501
Location: Belarus

zhak 11 Feb 2017, 12:16

I'm trying to redefine standard data types to use only inside macro, and then restore them back:

Code:

macro my? name
  struc db? arg
    label .
    match ?, arg
      rb 1
    else match n =dup? ?, arg
      rb n
    else match n =dup? (?), arg
      rb n
    else
      err "Invalid element data type definition"
    end match
    .__length = $ - .
    .__size = 1
  end struc
  
  macro end?.my?
    end struc
    . . .
    purge db?
    ;restore db
  end macro
    struc my
      . . .
end macro

however, purge or restore doesn't seem to undefine struc, because when I do

Code:

my OWN
  a db ?
end my

b db 1

some OWN a:3

I get custom error "Invalid element data type definition" for `b db 1`. Looks like `end my` doesn't restore the symbol.

11 Feb 2017, 12:16

Tomasz Grysztar

Joined: 16 Jun 2003
Posts: 8356
Location: Kraków, Poland

Tomasz Grysztar 11 Feb 2017, 12:38

It is the same as in fasm 1, for STRUC macros use RESTRUC instead of PURGE.

PURGE is for instruction class symbols (macros), RESTORE for expression class ones, and RESTRUC is for labeled instruction class (STRUC macros). You can have symbols with the same name in all three classes and each of them is going to work in the appropriate context.

11 Feb 2017, 12:38

zhak

Joined: 12 Apr 2005
Posts: 501
Location: Belarus

zhak 11 Feb 2017, 12:50

Ah, I see. I thought struc belongs to instruction class, too

11 Feb 2017, 12:50

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