label with a colon question

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MajorDill

Joined: 01 Nov 2010
Posts: 22

MajorDill 12 Oct 2016, 19:33

This is probable a stupid question but I'll ask it anyway

Is there a difference between a label with a colon and one without

my_area: times 12 db 0

- and -

my_area db 12 dup 0

If read the text file (fasm.txt) but I'm still not very clear.

12 Oct 2016, 19:33

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20445
Location: In your JS exploiting you and your system

revolution 12 Oct 2016, 19:48

There is a difference. Without a colon the label will be tagged with the data size.

Code:

my_area1 db 12 dup 0
my_area2: times 12 db 0
mov eax,[my_area1] ;<--- size not matched, cannot assemble
mov eax,[my_area2] ;<--- no size check done, will assemble

12 Oct 2016, 19:48

jorido

Joined: 23 Jan 2017
Posts: 53

jorido 23 Jan 2017, 18:27

which is more common or recommended?

23 Jan 2017, 18:27

Trinitek

Joined: 06 Nov 2011
Posts: 257

Trinitek 23 Jan 2017, 19:30

jorido wrote:

which is more common or recommended?

Most of the time, I would think that you would want size checking, but it depends on what you want to accomplish.

23 Jan 2017, 19:30

neville

Joined: 13 Jul 2008
Posts: 507
Location: New Zealand

neville 24 Jan 2017, 04:29

jorido wrote:

which is more common or recommended?

Welcome! I prefer no size checking because it gives maximum flexibilty. But I just have to be more careful to be sure that I'm always getting want I intended (if I deliberately mismatch the data widths).

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24 Jan 2017, 04:29

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20445
Location: In your JS exploiting you and your system

revolution 24 Jan 2017, 04:44

For me I prefer size checking. And when I need to access with a different size I use the size overrides. This way I know when I am accessing at a different size than what it was declared for.

24 Jan 2017, 04:44

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