77 lines
1.9 KiB
C
77 lines
1.9 KiB
C
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#include <objc/encoding.h>
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void print_ivars (Class class)
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{
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struct objc_ivar_list* ivars = class->ivars;
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int i;
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for (i = 0; i < ivars->ivar_count; i++) {
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struct objc_ivar *ivar = &(ivars->ivar_list[i]);
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printf ("ivar '%s', type '%s', offset %d\n",
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ivar->ivar_name, ivar->ivar_type, ivar->ivar_offset);
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}
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}
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void compare_structures (Class class, const char* type)
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{
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struct objc_struct_layout layout;
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struct objc_ivar_list* ivars = class->ivars;
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int i = 0;
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int position;
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objc_layout_structure (type, &layout);
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while (objc_layout_structure_next_member (&layout))
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{
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struct objc_ivar *ivar;
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const char *ivar_type;
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if (i > ivars->ivar_count)
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{
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printf ("too many ivars in type %s, layout = %s\n",
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type, layout.type);
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exit (1);
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}
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ivar = &(ivars->ivar_list[i]);
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objc_layout_structure_get_info (&layout, &position, NULL, &ivar_type);
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printf ("real ivar '%s' offset %d\n",
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ivar->ivar_name, ivar->ivar_offset);
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printf ("computed type '%s' offset %d\n", ivar_type, position);
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if (position != ivar->ivar_offset)
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{
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printf ("offset %d and computed position %d don't match on ivar '%s'"
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" (i = %d)\n",
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ivar->ivar_offset, position, ivar->ivar_name, i);
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exit (1);
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}
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i++;
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}
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printf ("%d ivars checked\n", i);
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}
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int main ()
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{
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struct class_vars
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{
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@defs (MyObject);
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};
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int size1, size2;
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Class class = [MyObject class];
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printf ("type = %s\n", @encode (struct class_vars));
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print_ivars (class);
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compare_structures (class, @encode(struct class_vars));
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if ((size1 = objc_sizeof_type (@encode(struct class_vars)))
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!= (size2 = sizeof (struct class_vars)))
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{
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printf ("sizes don't match (computed %d, exact %d)\n", size1, size2);
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abort ();
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}
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exit (0);
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}
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