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objc4 reviews and mentions
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Low overhead C++ interface for Apple's Metal API
> The specific method that's causing me trouble right at the moment is "computeCommandEncoder"
Yeah, it looks like there's no way to avoid autorelease here.
> It looks like objc_retainAutoreleasedReturnValue might be exactly what I'm looking for, even if it isn't 100% guaranteed; if I'm understanding, it would be safe, and wouldn't actually leak as long as you had an autorelease pool somewhere in the chain.
Indeed it would be safe and wouldn't leak, but the optimization is very much not guaranteed. It's based on the autorelease implementation manually reading the instruction at its return address to see if it's about to call objc_retainAutoreleaseReturnValue. See the description here:
https://github.com/apple-opensource/objc4/blob/a367941bce42b...
In fact – I did not know this before just now – on every arch other than x86-64 it requires a magic assembly sequence to be placed between the call to an autoreleasing method and the call to objc_retainAutoreleaseReturnValue.
It looks like swiftc implements this by just emitting LLVM inline asm blocks:
%6 = call %1* bitcast (void ()* @objc_msgSend to %1* (i8*, i8*, %0*)*)(i8* %5, i8* %3, %0* %4) #4
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apple-opensource/objc4 is an open source project licensed under GNU General Public License v3.0 or later which is an OSI approved license.
The primary programming language of objc4 is Objective-C++.
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