5  * to any person obtaining a copy of this software and associated documentation
7  * including without limitation the rights to use, copy, modify, merge, publish,
281 #pragma mark Copy/Release support
284 /* Copy, or bump refcount, of a block.  If really copying, call the copy helper if present. */
312     // Its a stack block.  Make a copy.  in _Block_copy_internal()
322 …   //printf("calling block copy helper %p(%p, %p)...\n", aBlock->descriptor->copy, result, aBlock);  in _Block_copy_internal()
323             (*aBlock->descriptor->copy)(result, aBlock); // do fixup  in _Block_copy_internal()
329         // This allows the copy helper routines to make non-refcounted block copies under GC  in _Block_copy_internal()
336         // if we copy a malloc block to a GC block then we need to clear NEEDS_FREE.  in _Block_copy_internal()
344             //printf("calling block copy helper...\n");  in _Block_copy_internal()
345             (*aBlock->descriptor->copy)(result, aBlock); // do fixup  in _Block_copy_internal()
364  * Otherwise we need to copy it and update the stack forwarding pointer
378         //printf("making copy\n");  in _Block_byref_assign_copy()
382         struct Block_byref *copy = (struct Block_byref *)_Block_allocator(src->size, false, isWeak);  in _Block_byref_assign_copy()  local
383 …      copy->flags = src->flags | _Byref_flag_initial_value; // non-GC one for caller, one for stack  in _Block_byref_assign_copy()
384         copy->forwarding = copy; // patch heap copy to point to itself (skip write-barrier)  in _Block_byref_assign_copy()
385         src->forwarding = copy;  // patch stack to point to heap copy  in _Block_byref_assign_copy()
386         copy->size = src->size;  in _Block_byref_assign_copy()
388             copy->isa = &_NSConcreteWeakBlockVariable;  // mark isa field so it gets weak scanning  in _Block_byref_assign_copy()
391             // Trust copy helper to copy everything of interest  in _Block_byref_assign_copy()
393             copy->byref_keep = src->byref_keep;  in _Block_byref_assign_copy()
394             copy->byref_destroy = src->byref_destroy;  in _Block_byref_assign_copy()
395             (*src->byref_keep)(copy, src);  in _Block_byref_assign_copy()
400                 (void *)&copy->byref_keep,  in _Block_byref_assign_copy()
534 …ck_copy and Block_release, called the copy and dispose helpers.  The copy helper emits a call to t…
542 So the Block copy/dispose helpers should only ever generate the four flag values of 3, 7, 8, and 24.
544 …copy/dispose helper functions.  Similarly to the Block copy helper, the "__block" copy helper (for…
546 So the __block copy/dispose helpers will generate flag values of 3 or 7 for objects and Blocks resp…
557  * When Blocks or Block_byrefs hold objects then their copy routine helpers use this entry point
567             // do *not* retain or *copy* __block variables whatever they are  in _Block_object_assign()
679             cp += sprintf(cp, "descriptor->copy helper: %p\n", (void *)(uintptr_t)dp->copy);  in _Block_dump()
695         cp += sprintf(cp, "  copy helper: %p\n", (void *)(uintptr_t)src->byref_keep);  in _Block_byref_dump()