variables buffer overflow

[AlanMzk]

I am coding a hanger with a number of dimensions calculated based on the input width and depth. While I have a number of Uvars I am no where near the 200 Uvars limit mentioned in the SCASM docs (my macro has 60).
When I compile the hanger in scenery using FSSC and SCASM v2.88 I get multiple ->variables buffer overflow messages
Then I get ->unknown variable messages for variables calculated using the Uvars preceding the ->variables buffer overflow messages

Anyone seen this before?
Anyone have a fix?

 

[arno]

Hi,

Can you maybe post a piece of your SCASM code? That makes it easier for us to spot where the problem is. I have not seen such problems before, so I can not tell you right away what the problem could be.

 

[AlanMzk]

Here is some of the code:

Area( 5 %1 %2 6 )
Set( BUF 15000 )
;BASIC Calculations
; Front/back wall dimensions
mif( [ %6 > 480 ] ) ; no greater than 10 units of 48 feet each
Uvar( $FBW [ 480 ] )
melse
Uvar( $FBW [ %6 ] )
mifend
mif( [ $FBW < 60 ] ) ; side no less than 60 feet
Uvar( $FB [ 60 ] )
melse
Uvar( $FB [ $FBW ] )
mifend

Uvar( $xp [ round[ $FB / 2 ]] ) ; front and back - door walls - full width points
; Front and back - door walls - upper width calculations
Uvar( $riwx [ round[ $xp * 0.8 ]] ) ; rough upper wall / roof - 1/2 width
; use texture multiplier of 5.3125 for all texture points
Uvar( $Rp [[ $riwx - 24 ] / 48 ] ) ; number of roof end sections (not including center 48 foot panel)
Uvar( $RpF [ int[ $riwx - 24 ] / 48 ] ) ; number of full roof end sections beyond middle
Uvar( $RpT [ $Rp - $RpF ] ) ; fractional remainder tail section
Uvar( $RTxR [ $RpT * 48 ] ) ; calculated right x point of outer wedge section
Uvar( $Twx [[ round[ $RTxR / 4 ]] * 4 ] ) ; Triangle x point (rounded to nearest multiple of 4)
Uvar( $Iwx [ 24 + [ $RpF * 48 ] + $Twx ] ) ; Final inner (upper) wall and roof 1/2 width
Uvar( $Rz [ round[ $xp * 0.42 ]] ) ; roof peak height
Uvar( $Owz [ round[ $Rz * 0.5 ]] ) ; outer wall height - tranform z value for lower panels above doors
Uvar( $OwzT [ int[ $Owz * 5.3125 ]] ) ; outer wall upper texture value for less than 48 ft panels
Uvar( $UOwz [ $Owz - 48 ] ) ; outer wall upper panel above base 48 ft panel
Uvar( $UOwzT [ int[ $UOwz * 5.3125 ]] ) ; outer wall upper texture value for panels above 48 ft panels
Uvar( $Dz [ int[ $Owz * 0.95 ]] ) ; door height
Uvar( $Iwz [ round[ $Rz - [ $Iwx * 0.25 ]] ) ; inner upper wall height - transform z value for roof wedges
Uvar( $Pbz [ $Rz - 6 ] ) ; Center peak base height- transform z parameter
Uvar( $IOz [ $Iwz - $Owz ] ) ; differential height outer wall to inner wall - for texture use
Uvar( $IOzT [ round[ $IOz * 5.3125 ]] ) ; top points for textures above door and below roof wedges
Uvar( $Mpz [ $Pbz - $Iwz ] ) ; middle panel height below peak and above lower panels
Uvar( $MpzT [ int[ $Mpz * 5.3125 ]] ) ; middle panel top texture point
Uvar( $RwT [ int[ $Twx * 5.3125 ]] ) ; Right Outer wedge outer texture point
Uvar( $LwT [ 255 - $RwT ] ) ; Left Outer wedge outer texture point
Uvar( $Tiz [ $Twx / 4 ] ) ; inner height of outer wedge section
Uvar( $TizT [ int[ $Tiz * 5.3125 ]] ) ; inner height of outer wedge section texture value
Uvar( $1TPz [ $Mpz - 12 ] ) ; outer height of 1st outer wedge section from middle section
Uvar( $1TPzT [ int[ $1TPz * 5.3125 ]] ) ; texture point value at outer height of 1st outer wedge section
Uvar( $2TPz [ $1TPz - 12 ] ) ; outer height of 2nd outer wedge section from middle section
Uvar( $2TPzT [ int[ $2TPz * 5.3125 ]] ) ; texture point value at outer height of 2nd outer wedge section
Uvar( $3TPz [ $2TPz - 12 ] ) ; outer height of 3rd outer wedge section from middle section
Uvar( $3TPzT [ int[ $3TPz * 5.3125 ]] ) ; texture point value at outer height of 3rd outer wedge section


.... and here are the first few error messages

Error in macro file D:\FSSCEN~1\Macros\ACM\KAPG\ACMHNG~1.API line 185
-> Uvar( $Tiz [ $Twx / 4 ] )
-> variables buffer overflow
Error in macro file D:\FSSCEN~1\Macros\ACM\KAPG\ACMHNG~1.API line 186
-> Uvar( $TizT [ int[ $Tiz * 5.3125 ]] )
-> unknown variable "$Tiz * 5.3125 ]"
Error in macro file D:\FSSCEN~1\Macros\ACM\KAPG\ACMHNG~1.API line 187
-> Uvar( $1TPz [ $Mpz - 12 ] )
-> variables buffer overflow
Error in macro file D:\FSSCEN~1\Macros\ACM\KAPG\ACMHNG~1.API line 188
-> Uvar( $1TPzT [ int[ $1TPz * 5.3125 ]] )
-> unknown variable "$1TPz * 5.3125 ]"
Error in macro file D:\FSSCEN~1\Macros\ACM\KAPG\ACMHNG~1.API line 189
-> Uvar( $2TPz [ $1TPz - 12 ] )
-> unknown variable "$1TPz - 12 ]"

As you can see the first -> variables buffer overflow results in a chain of other errors

Could this have something to do with the fact that I am using a series of calculations with subsequent variables being calculated from earlier ones?

 

[arno]

Hi,

Humm, I have never seen these errors before. And when I used UVar's it were only 1 or 2, so I never tried something as complex as this. At this moment I can not tell you what the problem is. Maybe Luis will read this thread, I think he has used UVar's more in his macros.

 

[AlanMzk]

Arno;
I went to the source...Manfred Moldenhauer ... and here is his response (for the benefit of all us dinosaurs still using SCASM)

"this error happens when the total number of variables exceeds the maximum number. In older versions this value was 200 and the actual version handles 500 user variables. Perhabs a change to a newer version will solve your problem.

BTW, the maximum number is "per file" and not per macro. So if you have one file including several macros this number can grow very quick if each macro generates its own variables."

It appears that my macro caused the total for the scenery to exceed the 500 Uvar limit Manfred identified.

 

[Luis_Sá]

Hi,

Thank you for sharing the explanation.

Regards, Luis - an happy SCASM dinosaur

 

[arno]

Yes, thanks as well for sharing. It is good to know undocumented "features" like this .