GAS - \@ in macros and labels

GAS - \@ in macros and labels

[kieft_brian]

I'm having a little trouble with specifying labels inside of two different
macros using the \@ variable. See the following...

 .MACRO tableHdr    someArgs
A_\@:
     .DC.W  (B_\@ - A_\@)   
    stuff....

 .ENDM

 .MACRO tableEnd    someArgs
B_\@:
 .ENDM

Unfortunately the number produced by \@ will never be in sync between the two
macros due to the fact that a new macro call will increment the counter (not to
mention that there may be some other macros called in between Hdr and End).

So I attempted to resolve the situation by creating my own variable...

.MACRO  tableHdr    someArgs
.SET    CMD_NUM,\@
A_CMD_NUM:
     .DC.W  (B_CMD_NUM - A_CMD_NUM)     
    stuff....

 .ENDM

 .MACRO tableEnd    someArgs
B_CMD_NUM:
 .ENDM


Unfortunately GAS sees this as literal text and throws a bunch of "symbol
already defined" errors. Any ideas on how to make the CMD_NUM appear as its
value in a label? Thanks,

Brian


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Re: GAS - \@ in macros and labels

[Scott Lanning]

On Wed, 29 May 2002 kieft_brian@si.com wrote:
> .MACRO  tableHdr    someArgs
> .SET    CMD_NUM,\@
> A_CMD_NUM:
>      .DC.W  (B_CMD_NUM - A_CMD_NUM)
>     stuff....
>
>  .ENDM
>
>  .MACRO tableEnd    someArgs
> B_CMD_NUM:
>  .ENDM
>
>
> Unfortunately GAS sees this as literal text and throws a bunch of "symbol
> already defined" errors. Any ideas on how to make the CMD_NUM appear as its
> value in a label? Thanks,

Please tell me if you figure it out. :)
In the meantime, I use `cpp`. Then you can use the concatenation
operator '##', like

#define tableHdr(cmd_num) A_ ## cmd_num:\
   and so on..

Re: GAS - \@ in macros and labels

[h-peter recktenwald]

On Thu, 30 May 2002 13:13:25 -0400
Scott Lanning <slanning@theworld.com> wrote:

> On Wed, 29 May 2002 kieft_brian@si.com wrote:
> > .MACRO  tableHdr    someArgs
> > .SET    CMD_NUM,\@
> > A_CMD_NUM:
> >      .DC.W  (B_CMD_NUM - A_CMD_NUM)
> >     stuff....
> >
> >  .ENDM
> >
> >  .MACRO tableEnd    someArgs
> > B_CMD_NUM:
> >  .ENDM
> >
> >
> > Unfortunately GAS sees this as literal text and throws a bunch of "symbol
> > already defined" errors. Any ideas on how to make the CMD_NUM appear as its
> > value in a label? Thanks,

if you want to generate linked/chained lists, you could use 'local' (numeric) 
labels, the range of which is far beyond the documented max. of 9. examples 
can be found in the linux kernel (arch/i386/lib/checksum.S, macroes SRC, DST) 
or, as aplied in "eForth" (http://www.lxhp.in-berlin.de/index-lx.shtml#e4)

regards,
	hp

-- 
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