[Oberon] SYSTEM Modules

[Chris Burrows]

> From: Walter Gallegos [mailto:walter at waltergallegos.com]
> Sent: Saturday, 10 November 2018 11:14 PM
> To: Chris Burrows
> Subject: Re: [Oberon] SYSTEM Modules
> 
> Write low level modules is a pain in Oberon-07. Need deal with
> SYSTEM, hardware register accesses, big memory buffers out side of
> main memory, bit handling, as the Murphy law statement, are addend in
> the worst way.
> 
> About your solution, I'm not check the sources if for the compiler
> modification the simple way is:
> SYSTEM MODULE
> or
> MODULE [some modifier]
> As MODULE* Used for RISC-0 modules.
> Best regards,
> Walter
> 

Now I've thought about it some more, there is no need for any new / changed
syntax. The rule that SYSTEM has to be in the import list if any SYSTEM
procedures are being referenced is sufficient. All we need is a new
implementation-dependent rule that when a SYSTEM procedure is referenced,
the SYSTEM qualifier is optional. If you want to be sure that your code
would compile on other systems you can still use the SYSTEM qualifier.
Whether it would then work on that other system is a question for another
day ;-)

The fact that all SYSTEM procedure names are uppercase-only still makes them
easy to search for in a large project.  

Regards,
Chris Burrows
CFB Software
http://www.astrobe.com