[PATCH] Add a "probe-stack" attribute

[John Kåre Alsaker]

Here's a rebased patchset.

On Sun, Feb 22, 2015 at 5:01 PM, John Kåre Alsaker
<john.mailinglists at gmail.com> wrote:
> Bump
>
> On Sat, Jan 17, 2015 at 9:57 AM, John Kåre Alsaker
> <john.mailinglists at gmail.com> wrote:
>> I have a patch to add __probestack to compiler-rt. No other such
>> function have a configurable name, so I don't see why __probestack
>> should be different.
>>
>> I'm not sure how to test for #3 as I don't think any calling
>> convention has RAX as live-in.
>>
>> I don't know if #4 even handles the edge case(s), which is why I added
>> an assertion, so I don't know how to test for those. I can add a test
>> for the non-edge case though.
>>
>> The stack-probe-size attribute interacts as expected (it just controls
>> the stack allocation size for which probes are required).
>>
>> On Fri, Jan 16, 2015 at 10:30 PM, Reid Kleckner <rnk at google.com> wrote:
>>> On Fri, Jan 16, 2015 at 12:43 PM, David Majnemer <david.majnemer at gmail.com>
>>> wrote:
>>>>
>>>> Reid, I'm not so sure.
>>>>
>>>> We already have a probe-stack-size attribute, how does this attribute
>>>> interact with that one?  Which targets have a __probestack that can be
>>>> called?
>>>
>>>
>>> There aren't any targets that use __probestack. It's new this patch. Maybe
>>> the attribute should take the symbol name as a value so it's user
>>> controlled?
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