PATCH: Merge objc-improvements-branch to mainline
Ziemowit Laski
zlaski@apple.com
Thu Sep 25 21:06:00 GMT 2003
On Thursday, Sep 25, 2003, at 08:35 US/Pacific, Kaelin Colclasure wrote:
> On Thursday, September 25, 2003, at 07:56 AM, Jason Merrill wrote:
>
>> On Thu, 25 Sep 2003 11:41:33 +0200, Dietmar Planitzer
>> <dave.pl@ping.at> wrote:
>>
>>> On Thursday, September 25, 2003, at 01:55 AM, Nicolas Roard wrote:
>>> The current macro based exception implementation has at least two
>>> significant disadvantages: (1) it is unsafe and (2) very inefficient
>>> on
>>> RISC CPUs.
>>
>> Unfortunately, it seems that the implementation being discussed only
>> solves
>> #1.
>
> True -- but this is because Apple has a widely deployed installed base
> of code which uses the "legacy" library-based exceptions. If they're
> ever to change this, it has to happen incrementally. By making the
> first generation of compiler-supported exceptions interoperable with
> the library (while simultaneously changing the library macros to now
> use the compiler support for new code), the necessary preconditions
> for eventually replacing uses of the legacy library-based exceptions
> are in place.
Yes, exactly. :-)
--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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