[Oberon] FPGA Oberon Article in Xilinx Xcell Journal (Issue 91)

[Jörg Straube]

Michael

You mean the missing "NEW(buf); Texts.OpenBuf(buf);“  before calling "Texts.Delete"
Indeed, has not been fixed yet :-(
Who will tell Niklaus Wirth?

br
Jörg

> Am 13.05.2015 um 19:47 schrieb Michael Schierl <schierlm at gmx.de>:
> 
> Am 13.05.2015 um 15:15 schrieb Srinivas Nayak:
> 
>> Good to see the article.
>> Here is the pdf.
>> www.xilinx.com/publications/archives/xcell/Xcell91.pdf
> 
> Quoted from the article:
> 
> "In fact, system integrity can be violated only by the use of operations
> in the pseudo-module SYSTEM, namely PUT and COPY"
> 
> 
> That's wishful thinking... System integrity can easily be violated by
> accessing uninitialized variables on the stack (it is left as an
> exercise to the reader to abuse this for implementing SYSTEM.PUT for the
> RISC processor in pure Oberon without importing the SYSTEM module). And
> there is no easy way of fixing this that does not impact performance
> (like initializing all variables on the stack), as the Oberon language
> neither has a notion of uninitialized variables, nor of "out" parameters.
> 
> I think the bug in System.Clear that sometimes overwrites some random
> piece of memory due to accessing an uninitialized pointer has not been
> fixed yet in the source published on Project Oberon, either.
> 
> 
> But apart from that, I like the article, too :)
> 
> 
> Regards,
> 
> 
> Michael
> 
> --
> Oberon at lists.inf.ethz.ch mailing list for ETH Oberon and related systems
> https://lists.inf.ethz.ch/mailman/listinfo/oberon

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