[PATCH] Add a "no-split-stack" function attribute.

[Luqman Aden]

On Sat, Oct 12, 2013 at 5:26 AM, Joerg Sonnenberger
<joerg at britannica.bec.de> wrote:
> On Fri, Oct 11, 2013 at 06:17:35PM -0700, Luqman Aden wrote:
>> This disable emission of segmented-stack prologues on a per-function
>> basis, even if segmented stacks are turned on globally.
>
> This sounds quite wrong without any further comment. What ensurse that
> the function will find enough stack space for example?
>
> Joerg

It's not supposed to guarantee any function tagged with it will have
enough stack space. In terms of use case (from #rust-internals on
Mozilla):

acrichto> I've been using it a lot where we're managing the stack
limits ourselves
acrichto> so during a context switch I need no_split_stack
acrichto> also the starting function for a thread
acrichto> basically the edge cases around setting up the state of the
world for functions with __morestack

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