[Oberon] RISC simulator

[Chris Burrows]

TRAP 4 results from accessing a NIL pointer. Don't let preconceived ideas ("I am sure ...", "I am also sure ...") prevent you from doing a proper investigation of the problem. ProjectOberon is pretty good at identifying runtime errors. If the system reports that you are accessing a NIL pointer at pos 4103 in Files then you can be fairly confident that is what is happening,

Regards,
Chris

Chris Burrows
CFB Software
http://www.cfbsoftware.com

From: Oberon [mailto:oberon-bounces at lists.inf.ethz.ch] On Behalf Of Jan de Kruyf
Sent: Sunday, 22 November 2015 5:21 AM
To: ETH Oberon and related systems
Subject: [Oberon] RISC simulator

Hallo,
I meant to ask for a while already:

What is the reason and has anybody got a solution for TRAP 4 appearing
after working for a while.
Like thus:
--------------------
  compiling ORPJ
  pos 4103  TRAP   4 in Files at 00005BD0
--------------------

I am sure it has nothing to do with Files.Mod because it might happen in any module.
And I am also sure that it is not my code, because restating the simulator fixes
the problem and the module compiles normally.

thanks

j.