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flat assembler > Compiler Internals > suggestion: Allow emit (dbx) with zero-length values

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zhak



Joined: 12 Apr 2005
Posts: 489
Location: Belarus
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
    
Post 01 Apr 2017, 22:47
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Tomasz Grysztar
Assembly Artist


Joined: 16 Jun 2003
Posts: 6906
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 4: 0 dup ?  ; same as dd 0 dup ?
dbx 1: ''       ; same as db ''    
Post 02 Apr 2017, 07:48
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