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Re: How should ObjC encode 'long'?


From: Kaelin Colclasure
Subject: Re: How should ObjC encode 'long'?
Date: Tue, 27 Jan 2004 14:37:19 -0800

On Jan 26, 2004, at 7:09 PM, Ziemowit Laski wrote:

Currently, ObjC encodes 'long' as 'l' (and 'unsigned long' as 'L'), but only if sizeof(long) == sizeof(int). On LP64 targets, where sizeof(long) == 2 * sizeof(int), 'long' and 'unsigned long' get encoded as 'q' and 'Q', respectively, instead.

Personally, I tend to think that this is broken, and that long should always be 'l', regardless of its size. However, I can also see an ABI argument (esp. in the context
of distributed objects) that would lead to the opposite conclusion.

What do you all think?

I would assume the whole point of "encoding" is to externalize the relevant type information. And if it's for external consumption, it needs to be fully self-describing. 'q' and 'Q' unambiguously denote a signed / unsigned quadword... Seems like exactly the right thing.

-- Kaelin


Thanks,

--Zem
--------------------------------------------------------------
Ziemowit Laski                 1 Infinite Loop, MS 301-2K
Mac OS X Compiler Group        Cupertino, CA USA  95014-2083
Apple Computer, Inc.           +1.408.974.6229  Fax .5477



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