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Index > Compiler Internals > pp/compiler equ bug

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maurifull



Joined: 05 Sep 2004
Posts: 10
Location: Argentina
maurifull
Hi
Latest fasm has bug replacing symbolic constants, you can check it with this code:

Code:
MYDEF1 equ 2if MYDEF1 eq 1        display "MYDEF2=A",13,10    MYDEF2 equ 'A'else if MYDEF1 eq 2 display "MYDEF2=B",13,10    MYDEF2 equ 'B'else if MYDEF1 eq 3 display "MYDEF2=C",13,10    MYDEF2 equ 'C'end ifdisplay "Compiler says MYDEF=", MYDEF2,13,10    


As you can see, MYDEF1 is defined as 2, so fasm should output 'MYDEF=B' and 'Compiler says MYDEF=B', but see compiler output:

Quote:

flat assembler version 1.55
MYDEF2=B
Compiler says MYDEF=C
1 passes, 0 bytes.


So, it seems fasm inconditionally search last line defining a symbol, wherever that code is applicable or not.
Post 05 Sep 2004, 18:12
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Dragontamer



Joined: 24 Aug 2003
Posts: 84
Dragontamer
Yes. That is true.
equ is ignored by if statements.

I think this is known already though.
Post 05 Sep 2004, 19:05
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Tomasz Grysztar
Assembly Artist


Joined: 16 Jun 2003
Posts: 7715
Location: Kraków, Poland
Tomasz Grysztar
Read the FAQ!!!

In FASM = symbol should be used for such purposes, EQU is more like a macro and works different way.
Post 05 Sep 2004, 19:35
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comrade



Joined: 16 Jun 2003
Posts: 1137
Location: Russian Federation
comrade
maurifull wrote:
Latest fasm has bug replacing symbolic constants


This worked before in previous FASM?

_________________
comrade (comrade64@live.com; http://comrade.ownz.com/)
Post 05 Sep 2004, 19:45
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maurifull



Joined: 05 Sep 2004
Posts: 10
Location: Argentina
maurifull
Privalov wrote:
Read the FAQ!!!

In FASM = symbol should be used for such purposes, EQU is more like a macro and works different way.


Sorry, I'm very new to fasm, but isn't = symbol for numeric constants only?

I just posted an small sample, what I'm actually using is TARGET equ <one of DOS, Linux, Win32> and then conditionally defining other symbols & assembling code based on that define.

Sorry if it is a nonsense, I'll continue my fasm studying Wink
Post 05 Sep 2004, 20:15
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maurifull



Joined: 05 Sep 2004
Posts: 10
Location: Argentina
maurifull
comrade wrote:
maurifull wrote:
Latest fasm has bug replacing symbolic constants


This worked before in previous FASM?


I don't know, stating 'last xxx project' is a report costume to inform one is using the latest version
Post 05 Sep 2004, 20:17
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Tomasz Grysztar
Assembly Artist


Joined: 16 Jun 2003
Posts: 7715
Location: Kraków, Poland
Tomasz Grysztar
maurifull wrote:
Sorry, I'm very new to fasm, but isn't = symbol for numeric constants only?

Yes, but your sample was also using numbers only.
Post 05 Sep 2004, 20:23
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maurifull



Joined: 05 Sep 2004
Posts: 10
Location: Argentina
maurifull
Privalov wrote:
maurifull wrote:
Sorry, I'm very new to fasm, but isn't = symbol for numeric constants only?

Yes, but your sample was also using numbers only.


I know, that's why I stated I use it another way

Here you have an example
Code:
if _PLATFORM_ eq Linux
   eol equ 10
else if _PLATFORM_ eq Win32 | _PLATFORM_ eq DOS
   eol equ 13,10
end if    


How can you make such definition by not using equ?
Post 05 Sep 2004, 20:31
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Tomasz Grysztar
Assembly Artist


Joined: 16 Jun 2003
Posts: 7715
Location: Kraków, Poland
Tomasz Grysztar
Yes, for such case conditional preprocessing is needed - I saw you have already found this thread.

PS. Use slashes, not backslashes, to end the BBCode tags - I was correcting it in your posts.
Post 05 Sep 2004, 20:35
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maurifull



Joined: 05 Sep 2004
Posts: 10
Location: Argentina
maurifull
Privalov wrote:
Yes, for such case conditional preprocessing is needed - I saw you have already found this thread.


Hehe, I'm going everywhere Wink
I'll take a new look.

Privalov wrote:
PS. Use slashes, not backslashes, to end the BBCode tags - I was correcting it in your posts.


Thanks, I noticed some things were not displaying right.
Post 05 Sep 2004, 20:40
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Tomasz Grysztar
Assembly Artist


Joined: 16 Jun 2003
Posts: 7715
Location: Kraków, Poland
Tomasz Grysztar
maurifull wrote:
Hehe, I'm going everywhere Wink

I commend it. Smile
Post 05 Sep 2004, 20:43
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