Re: NSArray: Problem allocating memory on stack on windows

[David Ayers]

Richard Frith-Macdonald wrote:

> There is now some experimental code in NSArray.m in CVS to use the 
> heap for numbers of objects above 1000 (an arbitrary choice).
> It uses a couple of new macros which will probably eventually make 
> their way to GSObjCRuntime.h once we've picked better names
> and decided on a good number ... perhaps nearer 100.
Hello Richard,

Because by convention we currently prefer autoreleased objects in GDL2 
and GSWeb, we have the need for a version of this macro that uses the 
GSAutoreleasedBuffer.  I've also played with allowing different types, 
making sure the size is evaluated only once and making the identifiers 
unique so that you could use multiple buffers in the the same block.  
Have a look at it and see if we should apply something this to the 
versions in -base also:

#define GDL2_BUFFER(ID, SIZE, TYPE) \
 unsigned ID##_size = (SIZE); \
 TYPE ID##_obuf[(ID##_size) <= GS_MAX_OBJECTS_FROM_STACK ? (ID##_size) : 0]; \
 TYPE *ID##_base = ((ID##_size) <= GS_MAX_OBJECTS_FROM_STACK) ? ID##_obuf \
   : ( TYPE *)GSAutoreleasedBuffer((ID##_size) * sizeof( TYPE )); \
 TYPE *ID = ID##_base;


For the non-autorelease version, we may want to consider (optionally ?) 
adding exception handling to free the buffer if necessary.

Cheers,
David