flat assembler
Message board for the users of flat assembler.
 Home   FAQ   Search   Register 
 Profile   Log in to check your private messages   Log in 
flat assembler > Compiler Internals > suggestion: Allow emit (dbx) with zero-length values

Author
Thread Post new topic Reply to topic
zhak



Joined: 12 Apr 2005
Posts: 473
Location: Belarus
suggestion: Allow emit (dbx) with zero-length values
A small suggestion to allow fasmg dbx 0: x.

Standard data type directives like db, dd, etc. allow zero-length values in form db 0 dup x, so I believe dbx should allow this also for consistency and convenience.

I applied this fix to my copy of fasmg, but I thought it's worth suggesting to include in official release.

For example, I found it handy in instruction set macros, when instead of

Code:

if imm_size = 2
  dw imm_value
else if imm_size = 4
  dd imm_value
end if



one can simply do

Code:

emit imm_sizeimm_value


Post 01 Apr 2017, 22:47
View user's profile Send private message Reply with quote
Tomasz Grysztar
Assembly Artist


Joined: 16 Jun 2003
Posts: 6517
Location: Kraków, Poland
This parameter is not the length of value, but the size of data unit. You can use zero-length values with DBX just like with any other data directive:

Code:
dbx 40 dup ?  ; same as dd 0 dup ?
dbx 1''       ; same as db ''

Post 02 Apr 2017, 07:48
View user's profile Send private message Visit poster's website Reply with quote
Display posts from previous:
Post new topic Reply to topic

Jump to:  


< Last Thread | Next Thread >

Forum Rules:
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum


Powered by phpBB © 2001-2005 phpBB Group.

Main index   Download   Documentation   Examples   Message board
Copyright © 2004-2016, Tomasz Grysztar.