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devel / comp.lang.forth / Re: Forth is the programming language of the future

Re: Forth is the programming language of the future

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Subject: Re: Forth is the programming language of the future
From: theinfo155@gmail.com (The Daily Info)
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by: The Daily Info - Fri, 8 Sep 2023 05:29 UTC

On Tuesday, December 6, 2022 at 3:37:53 PM UTC+5:30, Hans Bezemer wrote:
> On Thursday, November 10, 2022 at 3:49:37 PM UTC+1, shtps wrote:
> > He goes through a lot of things and he uses the return stack for control
> > flow towards the end.
> Although my own compiler (4tH) does allow it, I'm not quite a fan of manipulating
> the control stack for flow control. First, any word called has its own return address
> on the TORS. Usually, you have to take it off do do stuff and put it on later in order
> not to break things. IMHO this results in very murky code. Second, it's not portable.
> compilers may use a different mechanism to do flow control.
>
> Can't say I never used it, but I'm hesitant to do it - and only as a last resort. I'd rather
> inline such code - since at least then it remains WITHIN a definition.
>
> That doesn't mean I never use the return stack for my own purposes - quite the opposite.
> It's a useful temporary storage. A technique I often use is to store constant terms there
> - so they can be fetched with a single R@. It's quite useful when implementing routines
> with LOTS of parameters. You store the more constant ones on the return stack, TORS
> is perfect for stuff that RARELY changes - like "R> 1+ >R".
>
> For that reason 4tH supports R@, R'@ and R"@. They act like a kind of R/O registers. And
> it doesn't cause much overhead, since they're equivalent (in 4tH) to I, I' and J.
>
> Hans Bezemer
https://www.quickbookintegration.com

Subject	Author
Re: Forth is the programming language of the future	The Daily Info