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Re: Does Mac OS X support interior pointers?
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Re: Does Mac OS X support interior pointers?

Hi,

It strikes me as a workaround for this issue for now, you could stick this in a header file:

  static inline void gc_ptr_cleanup (void *pptr)

  {

    asm ("" :: "g" (pptr));

  }


  #define GC_PTR __attribute__((__cleanup__(gc_ptr_cleanup)))


and then when you call -[NSData bytes] or UTF8String, you can do this:

  const uint8_t *bytes GC_PTR = [data bytes];

  const char *str GC_PTR = [string UTF8String];


This would force the compiler to hang on to the pointers until they go out of scope. I've checked and it looks like the clang and gcc's optimisations don't mess things up (at the moment).


BTW, I haven't fully tested this—I've only had a quick look at the assembler and only on i386 and x86_64 architectures.


Regards,


Chris


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References: 
 >Re: Does Mac OS X support interior pointers? (From: Greg Guerin <email@hidden>)
 >Re: Does Mac OS X support interior pointers? (From: Hamish Allan <email@hidden>)
 >Re: Does Mac OS X support interior pointers? (From: Greg Guerin <email@hidden>)
 >Re: Does Mac OS X support interior pointers? (From: Bill Bumgarner <email@hidden>)
 >Re: Does Mac OS X support interior pointers? (From: Greg Guerin <email@hidden>)
 >Re: Does Mac OS X support interior pointers? (From: Bill Bumgarner <email@hidden>)



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