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- Subject: Re: [ANN] Lua 5.2.0 (beta-rc1) now available
- From: David Given <dg@...>
- Date: Tue, 14 Jun 2011 11:35:31 +0100
steve donovan wrote:
> On Mon, Jun 13, 2011 at 9:51 PM, Petite Abeille
> <firstname.lastname@example.org> wrote:
>> Goto? Really? How quaint :P
> Seriously, very useful sometimes. Even the person who hammered
> structured programming into me using Pascal (Judy Bishop) accepted
> that a goto could be used without committing a sin.
Hell yeah. I'm really happy to see this, it's something I've been
wanting in Lua for ages...
> Also, interesting possibilities for code generation.
...primarily for this reason. Trying to flatten a basic block graph into
runnable code when all you have are if...then...else, while...,
repeat...until etc is *really hard*, and I believe (though I haven't
seen proof) is actually impossible in the general case. Having actual
goto available makes life so much easier.
I assume that goto labels exist in their own namespace and are scoped
alongside locals; but the necessity for forward references does make
life more complicated. e.g.:
@label: -- 0
@label: -- 1
@label: -- 2
Does the goto jump to 0, 1, 2, or is this a compilation error?
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