suggestion: Allow emit (dbx) with zero-length values

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zhak

Joined: 12 Apr 2005
Posts: 501
Location: Belarus

zhak 01 Apr 2017, 22:47

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_size: imm_value

01 Apr 2017, 22:47

Tomasz Grysztar

Joined: 16 Jun 2003
Posts: 8351
Location: Kraków, Poland

Tomasz Grysztar 02 Apr 2017, 07:48

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 4: 0 dup ?  ; same as dd 0 dup ?
dbx 1: ''       ; same as db ''

02 Apr 2017, 07:48

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