Historical forum-msg-id-135468-edit, Revision 8
Original date:2021-01-13 11:29:44 Edited by: petelomax Subject: Re: wikipedia draft
I am guessing, but i suspect the labels in OE are in quotes, being strings, to avoid the possibility of them being reserved names of anything.
Maybe, I was not planning on replicating Euphoria's label "string" and goto "string" syntax anyway.
(I also have no intention of adding labelled/numbered break, continue or exit statements, or any form of retry. A goto would cover all that nonsense perfectly well enough anyway, and more.)
However, and you are in a better position than me to test this, this feature prohibits the ability to goto the value of a variable.
words = {"apple","tree","cow"}
goto words[1]
:tree -- code for trees
:apple -- code for apples
Oh my, I wasn't planning on anything like that.
Why on earth would anyone in their right mind ever want anything remotely like that, he asks, hopefully rhetorically.
Given that Phix already supports
#ilASM{ jmp :meaningful_label } ... #ilASM{ ::meaningful_label }
I was merely planning on the following (exact) syntax
goto :meaningful_label ... ::meaningful_label
And simply re-factoring/re-using some of the existing code.
goto should be resolved at compile-time, into a fixed single (possibly short) machine instruction.
If you think I was reluctant to add goto, imagine how reluctant I will be to carry forward a string lookup table and the associated address table into the runtime, along with error handling code and an almost guaranteed branch misprediction.
doesn't mean i'd prohibit back jumps.
I said recommend, not prohibit.
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