ZBasic Forum : ZBasic Language : One or more errors occurred in the back-end build...

ZBasic Home

Forum Rules

Forum FAQ

Memberlist

Usergroups

RSS Feed

Site Search

Links

Download

Digests and Subscriptions

Profile

One or more errors occurred in the back-end build...

Forum Index -> ZBasic Language

Author

Message

pjc30943

Joined: 02 Dec 2005
Posts: 220

Posted: 04 December 2008, 23:35 PM Post subject: One or more errors occurred in the back-end build...

When compiling with the following in a header:

Code:

'data storage arrays:
public const dataArrayLen as long = 10000
public threeDArray(dataArrayLen, 3) as single

the error

Quote:

"Error: one or more errors occurred in the back-end build process for "chirp.zxb" "

is shown. When dataArrayLen is taken down to a much smaller value, the project successfully compiles.

First issue: should the compiler return a more specific error?

Second issue: in the first module I have the following declared based on a previous post (http://www.zbasic.net/forum/about1063.html); I thought the RAM declaration was correct:

Code:

'----------- Configurations ---------\\
Option TargetCPU zx1280n
Option ExtRamConfig On
Option RamSize 65536 - Register.RamStart
Option PortPinEncoding Off
Option TaskStackMargin 12
'-------------------------------------//

The .map file shows RAMsize correctly declared as 65024; why the error, then? With the array length set to 1k, it shows an actual size of 43590 for main(); the reason for this is also unclear to me.

dkinzer
Site Admin

Joined: 03 Sep 2005
Posts: 2593
Location: Portland, OR

Posted: 05 December 2008, 0:23 AM Post subject: Re: "One or more errors occurred in the back-end build.

pjc30943 wrote:

First issue: should the compiler return a more specific error?

I agree that it would be more helpful to get a specific error message indicating that the aggregate size of the array is too large.

pjc30943 wrote:

The .map file shows RAMsize correctly declared as 65024; why the error, then?

If you're using 0-based indexing (which is the default), the array that you defined has 10,001 elements on one dimension and 4 elements on the other. Given that the size of a Single is 4 bytes, the aggregate size of the array is 160,016 bytes.

Even if you cut that array down so that it is smaller than the available RAM, there remains a limitation imposed by the back end compiler that no individual data item can have an aggregate size larger than 32768 bytes. At present, this fact isn't documented in the ZBasic manuals.

pjc30943 wrote:

With the array length set to 1k, it shows an actual size of 43590 for main()

I'm not sure what you mean here. Perhaps the 43590 is the code size for Main(). That would be unrelated to the issue of RAM size, of course.

pjc30943

Joined: 02 Dec 2005
Posts: 220

Posted: 05 December 2008, 21:24 PM Post subject:

For the following case:

Code:

public const dataArrayLen as integer = 6000
public twoDArray(dataArrayLen, 2) as unsignedinteger

6000*2*2 = 24k bytes, which is less than 32k, but the size error is given; for some reason the error arises for lengths longer than 5100 or so bytes.

Why the limitation in this case?

dkinzer
Site Admin

Joined: 03 Sep 2005
Posts: 2593
Location: Portland, OR

Posted: 05 December 2008, 21:57 PM Post subject:

pjc30943 wrote:

Why the limitation in this case?

Don't forget that array indices default to zero-based. The following compiles without error for me but if I change the constant to 8192, it fails.

Code:

Public Const dataArrayLen as Integer = 8191
Public twoDArray(1 to dataArrayLen, 1 to 2) as UnsignedInteger

Alternately, you can use the directive below to set the default lower bound for the module in which the array is defined.

Code:

Option Base 1

I misstated the limit in my earlier post. The limitation is that data items must have an aggregate size of less than 32768 bytes.

Display posts from previous:

	Forum Index -> ZBasic Language	Time synchro. with the server - Timezone/DST with your computer
Page 1 of 1