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mikep
Joined: 24 Sep 2005
Posts: 771
Location: Austin, TX
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Posted: 07 August 2010, 0:30 AM Post subject: Problem with program memory array indexing |
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I had some problems with indexing into program memory string arrays. Initially I thought it was because I was using a Byte index instead of an Integer (which shouldn't make a difference). The result was garbage strings. The following reduced code shows the problem | Code: | Private stringData as StringVectorData ({ "test" })
Public Sub Main()
Debug.print stringData(1 + 1 - 1) ' erroneous line
Debug.print stringData(1)
End Sub |
When compiled the following error message occurs | Code: | | test.bas:3: Warning(9): first index of "stringData" is greater than the upper bound |
What does "first index" mean in any case and the error shouldn't be occurring. The following snippet of generated native code indicates the problem | Code: | void
zf_Main(void)
{
outStr(progMemReadStringTbl(PROG_MEM(&mzv_stringData.ptr[10637328UL - 1])));
sendCRLF();
outStr(progMemReadStringTbl(PROG_MEM(&mzv_stringData.ptr[1 - 1])));
sendCRLF();
} |
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dkinzer
Site Admin
Joined: 03 Sep 2005
Posts: 2593
Location: Portland, OR
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Posted: 07 August 2010, 17:06 PM Post subject: Re: Problem with program memory array indexing |
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| mikep wrote: | | What does "first index" mean in any case and the error shouldn't be occurring. |
The use of "first index" is misleading, I suppose, since the the data item is a single dimension array. It would make more sense if the data item involved had multiple indices.
You are correct, of course, that the warning should not be issued. The correction in the compiler code was simple. An experimental version with the correction for this and a few other issues is available via the link below. The archive contains only the compiler executable and the changes.txt file. The executable can simply be extracted to the ZBasic installation directory. Copying or renaming the existing compiler executable before doing so is recommended.
http://www.zbasic.net/download/ZBasic/3.1/ZBasic_3-1-4.zip |
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mikep
Joined: 24 Sep 2005
Posts: 771
Location: Austin, TX
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Posted: 08 August 2010, 6:54 AM Post subject: |
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| Looks good now. Thank you for the fast fix. |
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