OpenEuphoria

Re: Bug in 2.4 beta

• Posted by Robert Craig <rds at RapidEuphoria.com> May 31, 2003
• 402 views

aku saya wrote:
> Using CreateLink.ew in eu 2.4 beta:
> 
> c:\euphoria\include\EuCOM.ew:611 in function add_iid()
> A machine-level exception occurred during execution of this statement
> ... called from c:\euphoria\include\EuCOM.ew:640 in function add_clsid()
> ... called from c:\euphoria\include\CreateLink.ew:43
> --> see ex.err
> 
> The line 611 of eucom.ew is
> iid_table[IID_CLSID] &= { {} }
> 
> So it seems it is an internal error.
> 
> No error in 2.3.

You should examine the statements that were executed
just before the crash. It could be that some data was poked
out of bounds.

A incorrect program might crash with 2.4 but
appear to work ok with 2.3. It could be a situation where
a Euphoria variable is now being overwritten
when you go out of bounds, where in 2.3 it was just
a harmless area of memory. Since Euphoria variables
contain pointers, overwriting a variable could cause
a crash, not just incorrect data.

euphoria\include\safe.e has a mode where it will
check the "gutter" areas just before and just after
each allocated block to see if anything was written there.
Set "edges_only" to 1. In the latest versions of Win32Lib
Derek is using Euphoria's allocate(), so this
might catch the problem.

Regards,
    Rob Craig
    Rapid Deployment Software
    http://www.RapidEuphoria.com