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Re: corebase: use __builtin___CFStringMakeConstantString when available?
From: |
Richard Frith-Macdonald |
Subject: |
Re: corebase: use __builtin___CFStringMakeConstantString when available? |
Date: |
Wed, 28 Jun 2017 09:41:01 +0100 |
> On 28 Jun 2017, at 09:37, David Chisnall <address@hidden> wrote:
>
> On 28 Jun 2017, at 01:19, Daniel Ferreira (theiostream) <address@hidden>
> wrote:
>>
>> That said, I need a way to place a valid Objective-C class definition
>> in that symbol on compile-time (probably it'd be an empty subclass of
>> NSCFString), but I'm totally unaware of any way to do that. Or maybe
>> make that point to an ordinary _OBJC_CLASS_* symbol somehow. Any
>> hints?
>
> I’m a bit hesitant to suggest this, as it introduces some Objective-C ABI
> dependency that I’d rather avoid, but you could do this by creating an alias
> in the base file that declares the NSConstantString class.
>
> Slightly longer term, I’d like to move to using a better structure for
> constant Objective-C strings, with space for unicode flags and a hash (which
> we’d compute at compile time, with a flag indicating which hashing algorithm
> we used, so that we could recompute it if GNUstep wants to use a different
> hash for strings, but have a fast path if the compiler and -base
> implementations agree).
Yes, storing a hash at compile time would make a substatial difference to
performance when using literal strings as dictionary keys. I'd really like
that.
- corebase: use __builtin___CFStringMakeConstantString when available?, Daniel Ferreira (theiostream), 2017/06/27
- Re: corebase: use __builtin___CFStringMakeConstantString when available?, Ivan Vučica, 2017/06/27
- Re: corebase: use __builtin___CFStringMakeConstantString when available?, Fred Kiefer, 2017/06/27
- Re: corebase: use __builtin___CFStringMakeConstantString when available?, Ivan Vučica, 2017/06/27
- Re: corebase: use __builtin___CFStringMakeConstantString when available?, Daniel Ferreira (theiostream), 2017/06/27
- Re: corebase: use __builtin___CFStringMakeConstantString when available?, Fred Kiefer, 2017/06/28
- Re: corebase: use __builtin___CFStringMakeConstantString when available?, Richard Frith-Macdonald, 2017/06/28
- Re: corebase: use __builtin___CFStringMakeConstantString when available?, David Chisnall, 2017/06/28
- Re: corebase: use __builtin___CFStringMakeConstantString when available?,
Richard Frith-Macdonald <=
- Re: corebase: use __builtin___CFStringMakeConstantString when available?, Stefan Bidigaray, 2017/06/28