ObjFW  Check-in [973574d1bd]

{
	OFObject *instance;
	size_t instanceSize;

	instanceSize = class_getInstanceSize(class);

	if OF_UNLIKELY (extraAlignment > 1)
		extraAlignment = ((instanceSize + extraAlignment - 1) &
		    ~(extraAlignment - 1)) - extraAlignment;
		extraAlignment = OFRoundUpToPowerOf2(extraAlignment,
		    PRE_IVARS_ALIGN + instanceSize) -
		    PRE_IVARS_ALIGN - instanceSize;

	instance = calloc(1, PRE_IVARS_ALIGN + instanceSize +
	    extraAlignment + extraSize);

	if OF_UNLIKELY (instance == nil) {
		object_setClass((id)&allocFailedException,
		    [OFAllocFailedException class]);