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Re: Which flavor of objc_msgSend for NSSize return
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Re: Which flavor of objc_msgSend for NSSize return


  • Subject: Re: Which flavor of objc_msgSend for NSSize return
  • From: Rosyna <email@hidden>
  • Date: Fri, 11 May 2007 13:00:34 -0700

I actually just ended up doing what people kept telling me to do. Compile some objective-c code that calls the function, disassemble, and see what gcc does.

GCC calls objc_msgSend() on i386 if the type is NSRange or NSSize. Using stret for these is declared as bad/wrong by some people since the handling is very different on i386 for structs <=8 bytes. (But golly, I can't remember where I saw an official document on what small meant).

But either way, I'd like to see an official document dealie describing which to use in which case. I would hate to be depending on an implementation detail. Especially when the entire point of this particular piece of code is to make sure I can adapt if the implementation changes.

Ack, at 5/11/07, Sherm Pendley said:

On May 11, 2007, at 3:13 PM, Rosyna wrote:

I'm trying to call a method that returns an NSSize on i386. Do I use objc_msgSend, _fpret, or _stret?

CamelBones uses _stret for all of NSPoint, NSRange, NSRect, and NSSize. It only uses _fpret on Intel if the return is a plain old float or double, not a struct of any sort.


NSSize is small, so the size qualifies for the plain objc_msgSend.

"Small" is small enough to fit in one register, but two floats don't.

--


Sincerely, Rosyna Keller Technical Support/Carbon troll/Always needs a hug

Unsanity: Unsane Tools for Insanely Great People

It's either this, or imagining Phil Schiller in a thong.
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References: 
 >Which flavor of objc_msgSend for NSSize return (From: Rosyna <email@hidden>)
 >Re: Which flavor of objc_msgSend for NSSize return (From: Sherm Pendley <email@hidden>)

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