RFR: 8223089: Stack alignment for x86-32

[Andrew Haley]

On 5/2/19 12:32 PM, Florian Weimer wrote:
> If you want to compile Hotspot with SSE2, you will have to realign the
> stack when JNI code calls back into Hotspot.  Otherwose, you lose
> support for legacy JNI libraries which do not preserve stack alignment
> (as required after that silent ABI bump).

I'm surprised that's a problem, really.

> Supporting such legacy code is the reason why the system libraries in
> our distribution do not require stack realignment on i386, so compiling
> Hotspot without SSE2 would also avoid the problem there, even if Hotspot
> code calls such function such as malloc in response to requests from JNI
> code.

What about other distros, though? Aren't we just playing with fire?

-- 
Andrew Haley
Java Platform Lead Engineer
Red Hat UK Ltd. <https://www.redhat.com>
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