The humble Substack

Graham Samuel livfoss at mac.com
Mon Nov 18 17:43:16 CET 2013


Hi Richard

I've been following this conversation, but I don't see a mail from Mark. Maybe it's a timezone problem. Could you kindly forward it to the list?

TIA

Graham

On 18 Nov 2013, at 14:51, Richard Gaskin wrote:

> Cal Horner wrote:
> 
>> When a combination mainstack/substack(s) application is compiled into a
>> standalone, how much of substack is  converted from an interpreted
>> environment into a compiled application?
> 
> As Mark noted, a standalone is essentially just a copy of the stackfile with the runtime engine embedded into it.  So it's "compiled" only in the dictionary sense of the word, as in "combined".
> 
> In the Computer Science sense of "compiled", meaning translated to native machine instructions executable by the CPU, that happens dynamically whenever the message path is changed.
> 
> So as Mark noted, when opening a stack the engine unpacks the object structures and sets up the message path, and at that point the scripts are tokenized into a compact bytecode format for easy translation by the engine to the native machine-code instructions as the script is run.
> 
> But this tokenization, or first-pass compilation, also occurs when setting the script property of an object, or using any of the fully-dynamically-compiled expressions like do, call, send, or dispatch.
> 
> In this regard I like to think of LC as being more akin to a virtual machine than a common app, very much like Dalvik or Java in the way it maintains platform-independence of the code until runtime.
> 
> --
> Richard Gaskin
> Fourth World
> LiveCode training and consulting: http://www.fourthworld.com
> Webzine for LiveCode developers: http://www.LiveCodeJournal.com
> Follow me on Twitter:  http://twitter.com/FourthWorldSys
> 
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