Re: [Nasm-users] macro variables in labels? strange problem!

[Per J. <pe...@co...>]

Frank Kotler wrote:
> Hi Per,
> Hi List,
> 
> As "owner" of this list, I got the following...
> 
>> As list administrator, your authorization is requested for the
>> following mailing list posting:
> 
> blah, blah, blah...
> 
> But when I logged in to approve it, I was informed that there were "no 
> pending requests". Did you "cancel" it somehow, Per? (how?) Or is SF 
> just messin' with me (us)? 

Hi Frank

yes I can cancelled it - I worked out the answer myself.

>> I'm trying generate labels using a macro, e.g. like this:
>>
>>    %macro blop 1
>>    %assign n 0
>>
>>    %rep %1
>>    %assign n n+1
>> label_n:
>>    somecode
>>       %endrep
>>
>>    %endmacro
>>
>> I was hoping to end up with a set of labels
>>
>> label_1:
>>    somecode
>> label_2:
>>    somecode
>> etcetera
>>
>> I'm feeling pretty stupid having to ask, but how do I get the
>> variable 'n' expanded in(to) the label?
> 
> It's a better question than it might seem at first! At one time, in some 
> cases, Nasm would have done what you want. But it's been "tightened up" 
> in recent versions, and you really need to use the "%+" operator!

Ah, thanks - my solition was to use

label_%[n]

which also worked. I like %+n better though.

>> Later I also want to generate:
>>
>> global  label_n:func
>> lenlab_n    db      *-label_n
>>
>> (with 'n' being my variable).
> 
> I suspect you want '$', not '*'. The '$' is evaluated where it occurs, 
> so this length calculation needs to be done right after the "label" 

Yep, the '*' was a typo ('*' is used as location counter in S390 assembler, iirc).

> FWIW, I created this list at the request of another developer, to keep 
> this kind of question off the "developer's list". It gets very little 
> traffic. There's the "Nasm Forum" here:
> 
> http://forum.nasm.us
> 
> which is also suitable for this kind of question. You might get better 
> results there.

I'm too lazy to use forums - I sometimes post a question, but then I forget
where I posted it ....


/Per