make fasm know [sample.m2] is actually [_sample.m2]

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vbVeryBeginner

Joined: 15 Aug 2004
Posts: 884
Location: \\world\asia\malaysia

vbVeryBeginner 16 Jan 2006, 00:44

Code:

include '%fasminc%\win32ax.inc'

.code

struct ts
        m1 dd ?
        m2 dd ?
ends

        _sample ts
        sample equ _sample

  start:
                        mov  [_sample.m1],20
                        mov  [sample.m2],30
        invoke  ExitProcess,0

.end start

output

Code:

ts.txt [15]:
                        mov  [sample.m2],30
error: undefined symbol.

is there any possible way to let assembler know that [sample.m2] is actually same as [_sample.m2]?

16 Jan 2006, 00:44

Tomasz Grysztar

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

Tomasz Grysztar 16 Jan 2006, 09:22

Maybe

Code:

virtual at _sample
  sample ts
end virtual

16 Jan 2006, 09:22

vbVeryBeginner

Joined: 15 Aug 2004
Posts: 884
Location: \\world\asia\malaysia

vbVeryBeginner 16 Jan 2006, 10:06

hi tomasz,
no luck Sad

Code:

include '%fasminc%\win32ax.inc' 
.code 
struct ts 
        m1 dd ? 
        m2 dd ? 
ends 
        _sample ts
virtual at _sample 
  sample ts 
end virtual
       
  start: 
                        mov  [sample.m2],30 
        invoke  ExitProcess,0 

.end start

the above result

testing.exe has encountered a problem and needs to close. We are sorry for the inconvenience.

If you were in the middle of ... ... bla bla bla
for more information about this error, click here ...

16 Jan 2006, 10:06

Tomasz Grysztar

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

Tomasz Grysztar 16 Jan 2006, 10:13

That problem is only because you try to write the not-writeable section (the .code one). Remove ".code" macro to make it use default ".flat" section and it works.

16 Jan 2006, 10:13

vbVeryBeginner

Joined: 15 Aug 2004
Posts: 884
Location: \\world\asia\malaysia

vbVeryBeginner 16 Jan 2006, 10:24

thank you tomasz for your fast reply Smile

thanks :p
and sorry for my stupid :p

but, why "sample equ _sample" couldn't solve such problem, since when sample equ to _sample, no variable with name "sample" is allowed anymore, and imho, the assembler should know [sample.xval] is equal to [_sample.xval]. :p

16 Jan 2006, 10:24

Tomasz Grysztar

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

Tomasz Grysztar 16 Jan 2006, 10:26

This is because the dot is not a special character in fasm, in a sense that is the part of label name as any other character is. So after the "_sample.xval" gets defined, it's the whole entity and assembler cannot know what was it made from - well, you could also define it just this way:

Code:

_sample.xval:

etc.

16 Jan 2006, 10:26

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