1 /* go-type-interface.c -- hash and equality interface functions.
2
3 Copyright 2009 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 "interface.h"
9 #include "go-type.h"
10
11 /* A hash function for an interface. */
12
13 uintptr_t
__go_type_hash_interface(const void * vval,uintptr_t key_size)14 __go_type_hash_interface (const void *vval,
15 uintptr_t key_size __attribute__ ((unused)))
16 {
17 const struct __go_interface *val;
18 const struct __go_type_descriptor *descriptor;
19 uintptr_t size;
20
21 val = (const struct __go_interface *) vval;
22 if (val->__methods == NULL)
23 return 0;
24 descriptor = (const struct __go_type_descriptor *) val->__methods[0];
25 size = descriptor->__size;
26 if (__go_is_pointer_type (descriptor))
27 return descriptor->__hashfn (&val->__object, size);
28 else
29 return descriptor->__hashfn (val->__object, size);
30 }
31
32 /* An equality function for an interface. */
33
34 _Bool
__go_type_equal_interface(const void * vv1,const void * vv2,uintptr_t key_size)35 __go_type_equal_interface (const void *vv1, const void *vv2,
36 uintptr_t key_size __attribute__ ((unused)))
37 {
38 const struct __go_interface *v1;
39 const struct __go_interface *v2;
40 const struct __go_type_descriptor* v1_descriptor;
41 const struct __go_type_descriptor* v2_descriptor;
42
43 v1 = (const struct __go_interface *) vv1;
44 v2 = (const struct __go_interface *) vv2;
45 if (v1->__methods == NULL || v2->__methods == NULL)
46 return v1->__methods == v2->__methods;
47 v1_descriptor = (const struct __go_type_descriptor *) v1->__methods[0];
48 v2_descriptor = (const struct __go_type_descriptor *) v2->__methods[0];
49 if (!__go_type_descriptors_equal (v1_descriptor, v2_descriptor))
50 return 0;
51 if (__go_is_pointer_type (v1_descriptor))
52 return v1->__object == v2->__object;
53 else
54 return v1_descriptor->__equalfn (v1->__object, v2->__object,
55 v1_descriptor->__size);
56 }
57