Any way to refer to the most recent global label?

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mindcooler

Joined: 01 Dec 2009
Posts: 423
Location: Västerås, Sweden

mindcooler 12 May 2010, 21:07

Any way to refer to the most recent global label? Like a local label, but without the dot. And the label.

Code:

p_string        db      'Some string',0
 .size=$-(something that points out p_string implicitly)

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12 May 2010, 21:07

bitshifter

Joined: 04 Dec 2007
Posts: 796
Location: Massachusetts, USA

bitshifter 12 May 2010, 23:31

Like this?
(From FASM manual, chapter 2.3.4)

Code:

struc db [data]
{
common
. db data
.size = $ - .
}

12 May 2010, 23:31

mindcooler

Joined: 01 Dec 2009
Posts: 423
Location: Västerås, Sweden

mindcooler 12 May 2010, 23:36

So the way to go is to put the data in a struc? I guess so..

12 May 2010, 23:36

mindcooler

Joined: 01 Dec 2009
Posts: 423
Location: Västerås, Sweden

mindcooler 12 May 2010, 23:57

Code:

struc string [data]
{
   common
        . db data
        .size = $ - .
}

and some

Code:

p_error         string  'Parse error at '
p_success       string  $0d,$0a,'Parse successful!'

works nicely! Thanks!

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12 May 2010, 23:57

bitshifter

Joined: 04 Dec 2007
Posts: 796
Location: Massachusetts, USA

bitshifter 13 May 2010, 00:05

Dont forget the NULL terminator (if required)
You could even modify the macro to insert it automatically...

13 May 2010, 00:05

mindcooler

Joined: 01 Dec 2009
Posts: 423
Location: Västerås, Sweden

mindcooler 13 May 2010, 00:21

I print those strings with WriteConsole, so instead of an end of string marker, I need the char count.

13 May 2010, 00:21

Tyler

Joined: 19 Nov 2009
Posts: 1216
Location: NC, USA

Tyler 13 May 2010, 03:37

You should use Pascal style strings http://en.wikipedia.org/wiki/String_%28computer_science%29#Representations. Just pass pointer to string +1 instead, so as to skip the char count byte.

13 May 2010, 03:37

mindcooler

Joined: 01 Dec 2009
Posts: 423
Location: Västerås, Sweden

mindcooler 13 May 2010, 11:37

Yes, wherever you need dynamic length information, saving the length of the string is a good idea. Reserve a 0 at the end of the string, and you can use it anywhere.

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13 May 2010, 11:37

mindcooler

Joined: 01 Dec 2009
Posts: 423
Location: Västerås, Sweden

mindcooler 13 May 2010, 17:06

I use .size thisly:

Code:

macro output ptr
{
   common
        mov     esi,ptr
        mov     eax,ptr#.size
        call    printstr
}

Code:

output  c_lvalue

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13 May 2010, 17:06

Tyler

Joined: 19 Nov 2009
Posts: 1216
Location: NC, USA

Tyler 14 May 2010, 09:47

Is there a way to add the name of the most recent global then the most recent local(Is the "." recursive)?

Code:

global:
.local: ; I know how this works
.local.sublocal: ; Is there a way to eliminate the need for the .local at the begginning?

I use labels like this to organize my code in to globals, sections, and subsections based on where the (sub)section is called from. It gets irritating after the typing .local.sublocal for every subdivision past that level.

14 May 2010, 09:47

Tomasz Grysztar

Joined: 16 Jun 2003
Posts: 8367
Location: Kraków, Poland

Tomasz Grysztar 14 May 2010, 10:11

Try this: http://board.flatassembler.net/topic.php?t=3744

14 May 2010, 10:11

Tyler

Joined: 19 Nov 2009
Posts: 1216
Location: NC, USA

Tyler 15 May 2010, 01:41

And I thought I was special for my little conditional mov macro, I can't even tell what you're doing in that one Smile

. Thanks, that'll work.

15 May 2010, 01:41

Tyler

Joined: 19 Nov 2009
Posts: 1216
Location: NC, USA

Tyler 16 May 2010, 15:48

Tomasz, I don't mean to be annoying, I'm sure people are suggesting "improvements" for Fasm all the time. But if you decide to implement the function of your func/endf macro achieves as built-in, I think using multiple "."s would be the most intuitive way to indicate nesting level.

Example:

Code:

global:
.local:
..sublocal:
.local2:

Would result in:

Code:

global:
global.local:
global.local.sublocal:
global.local2:

Would this interfere with any existing functionality?

16 May 2010, 15:48

vid
Verbosity in development

Joined: 05 Sep 2003
Posts: 7105
Location: Slovakia

vid 16 May 2010, 20:47

Quote:

Would this interfere with any existing functionality?

Yep. Check the manual about meaning of double-dot prefix

16 May 2010, 20:47

Tyler

Joined: 19 Nov 2009
Posts: 1216
Location: NC, USA

Tyler 16 May 2010, 22:21

Does the "@" in front of a label mean anything? I'm not going to suggest replacing ".." with "@", but if it won't interfere, I'm thinking about making a patch doing just that, and replacing the current functionality of multiple dots with what I mentioned above.

16 May 2010, 22:21

vid
Verbosity in development

Joined: 05 Sep 2003
Posts: 7105
Location: Slovakia

vid 16 May 2010, 22:30

People may have used labels starting with "@" in their code - I have already seen this couple times in real-world code.

16 May 2010, 22:30

Tyler

Joined: 19 Nov 2009
Posts: 1216
Location: NC, USA

Tyler 16 May 2010, 22:47

I wrote:

I'm not going to suggest replacing ".." with "@", [...]

It'll be a personal patch, although (if I do it) I will release it, it'll be optional to use it. If someone uses labels like that, they won't have to use my patch.

16 May 2010, 22:47

vid
Verbosity in development

Joined: 05 Sep 2003
Posts: 7105
Location: Slovakia

vid 17 May 2010, 07:26

In such case... go on! Smile

17 May 2010, 07:26

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