1 /* go-eface-compare.c -- compare two empty values.
2 
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.  */
6 
7 #include "runtime.h"
8 #include "go-type.h"
9 #include "interface.h"
10 
11 /* Compare two interface values.  Return 0 for equal, not zero for not
12    equal (return value is like strcmp).  */
13 
14 intgo
__go_empty_interface_compare(struct __go_empty_interface left,struct __go_empty_interface right)15 __go_empty_interface_compare (struct __go_empty_interface left,
16 			      struct __go_empty_interface right)
17 {
18   const struct __go_type_descriptor *left_descriptor;
19 
20   left_descriptor = left.__type_descriptor;
21 
22   if (left_descriptor == NULL && right.__type_descriptor == NULL)
23     return 0;
24   if (left_descriptor == NULL || right.__type_descriptor == NULL)
25     return 1;
26   if (!__go_type_descriptors_equal (left_descriptor,
27 				    right.__type_descriptor))
28     return 1;
29   if (__go_is_pointer_type (left_descriptor))
30     return left.__object == right.__object ? 0 : 1;
31   if (!__go_call_equalfn (left_descriptor->__equalfn, left.__object,
32 			  right.__object, left_descriptor->__size))
33     return 1;
34   return 0;
35 }
36