1 /* go-eface-compare.c -- compare two empty values.
3 Copyright 2010 The Go Authors. All rights reserved.
4 Use of this source code is governed by a BSD-style
5 license that can be found in the LICENSE file. */
10 /* Compare two interface values. Return 0 for equal, not zero for not
11 equal (return value is like strcmp). */
14 __go_empty_interface_compare (struct __go_empty_interface left
,
15 struct __go_empty_interface right
)
17 const struct __go_type_descriptor
*left_descriptor
;
19 left_descriptor
= left
.__type_descriptor
;
21 if (((uintptr_t) left_descriptor
& reflectFlags
) != 0
22 || ((uintptr_t) right
.__type_descriptor
& reflectFlags
) != 0)
23 __go_panic_msg ("invalid interface value");
25 if (left_descriptor
== NULL
&& right
.__type_descriptor
== NULL
)
27 if (left_descriptor
== NULL
|| right
.__type_descriptor
== NULL
)
29 if (!__go_type_descriptors_equal (left_descriptor
,
30 right
.__type_descriptor
))
32 if (__go_is_pointer_type (left_descriptor
))
33 return left
.__object
== right
.__object
? 0 : 1;
34 if (!left_descriptor
->__equalfn (left
.__object
, right
.__object
,
35 left_descriptor
->__size
))