1 /* go-can-convert-interface.c -- can we convert to an interface?
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. */
11 #include "interface.h"
13 /* Return whether we can convert from the type in FROM_DESCRIPTOR to
14 the interface in TO_DESCRIPTOR. This is used for type
18 __go_can_convert_to_interface (
19 const struct __go_type_descriptor *to_descriptor,
20 const struct __go_type_descriptor *from_descriptor)
22 const struct __go_interface_type *to_interface;
24 const struct __go_interface_method *to_method;
25 const struct __go_uncommon_type *from_uncommon;
26 int from_method_count;
27 const struct __go_method *from_method;
30 /* In a type switch FROM_DESCRIPTOR can be NULL. */
31 if (from_descriptor == NULL)
34 __go_assert (to_descriptor->__code == GO_INTERFACE);
35 to_interface = (const struct __go_interface_type *) to_descriptor;
36 to_method_count = to_interface->__methods.__count;
37 to_method = ((const struct __go_interface_method *)
38 to_interface->__methods.__values);
40 from_uncommon = from_descriptor->__uncommon;
41 if (from_uncommon == NULL)
43 from_method_count = 0;
48 from_method_count = from_uncommon->__methods.__count;
49 from_method = ((const struct __go_method *)
50 from_uncommon->__methods.__values);
53 for (i = 0; i < to_method_count; ++i)
55 while (from_method_count > 0
56 && (!__go_ptr_strings_equal (from_method->__name,
58 || !__go_ptr_strings_equal (from_method->__pkg_path,
59 to_method->__pkg_path)))
65 if (from_method_count == 0)
68 if (!__go_type_descriptors_equal (from_method->__mtype,