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Accelerated Objective-C Dispatch or: Who is 0xfffeff00 ?
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Accelerated Objective-C Dispatch or: Who is 0xfffeff00 ?


  • Subject: Accelerated Objective-C Dispatch or: Who is 0xfffeff00 ?
  • From: "Gerriet M. Denkmann" <email@hidden>
  • Date: Sat, 17 Sep 2005 22:13:24 +0200

When I switch on the Xcode-flag "Accelerated Objective-C Dispatch" (-fobjc-direct-dispatch) (Tiger only) the code generated for sending Objective-C messages looks kind of strange:

00001044 bla 0xfffeff00
Note that even otool does not seem to know what this 0xfffeff00 stands for.


And I can't find the address 0xfffeff00 in any load command, nor do I see it in the symbol table.
How do I know that 0xfffeff00 stands for _objc_msgSend?


Without Accelerated Objective-C Dispatch the code looks like:

00001024        bl      0x2540  ; symbol stub for: _objc_msgSend

Is this new fashion of sending Objective-C messages documented anywhere?

Kind regards,

Gerriet.

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