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Re: Emacs Anyone?


From: Fred Kiefer
Subject: Re: Emacs Anyone?
Date: Tue, 7 Mar 2017 23:27:45 +0100

Sorry, I fail to understand what is going on here. The code sends the message 
alloc to the class object NSAutoreleasePool and this ends up das a forwarding 
message. Why doesn’t it use the super implementation of alloc in NSObject? 
Which Objective-C runtime are you using? Most likely the gcc one.
Somebody with a deeper understanding of the inner working of our different 
runtimes should step up here.

Fred


> Am 07.03.2017 um 18:30 schrieb Riccardo Mottola <address@hidden>:
> Wolfgang Lux wrote:
>> Instead of speculating I would suggest getting definitive information by 
>> setting a breakpoint at the point where the missing autorelease pool is 
>> reported (line 368 in NSAutoreleasePool.m in the current svn version) and 
>> get a backtrace from gdb.:-)
> It is an issue that happens during building!
> 
> This is the trace I get:
> (gdb) bt
> #0  +[NSAutoreleasePool addObject:] (
>    self=0xbb6c7f80 <_OBJC_Class_NSAutoreleasePool>,
>    _cmd=0xbb6fd4d8 <_OBJC_SELECTOR_TABLE+120>, anObj=0x8f57650)
>    at NSAutoreleasePool.m:368
> #1  0xbb4442c9 in -[NSObject autorelease] (self=0x8f57650,
>    _cmd=0xbb6f6440 <_OBJC_SELECTOR_TABLE+32>) at NSObject.m:1633
> #2  0xbb43051f in +[NSMethodSignature signatureWithObjCTypes:] (
>    self=0xbb6f64c0 <_OBJC_Class_NSMethodSignature>,
>    _cmd=0xbb7407a0 <_OBJC_SELECTOR_TABLE>,
>    t=0x843790c <_OBJC_METH_VAR_TYPE_11> "@address@hidden:4") at 
> NSMethodSignature.m:559
> #3  0xbb515add in gs_objc_msg_forward2 (
>    receiver=0xbb6c7f80 <_OBJC_Class_NSAutoreleasePool>,
>    sel=0x843a130 <_OBJC_SELECTOR_TABLE+1008>) at GSFFIInvocation.m:140
> #4  0xbb27a8d1 in __objc_get_forward_imp () from /usr/lib/libobjc.so.4
> #5  0xbb27c0d2 in objc_msg_lookup () from /usr/lib/libobjc.so.4
> #6  0x081e3546 in ns_alloc_autorelease_pool () at nsterm.m:642
> #7  0x08218a20 in main (argc=<optimized out>, argv=0xbfbfea5c) at emacs.c:1213
> 
> a bit of context shows... that it is the allocation of the ARP itself!
> 
> 641     {
> 642       return [[NSAutoreleasePool alloc] init];
> 643     }
> 644
> 
> 
> Riccardo
> 
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