1 // Copyright 2010 The Go Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style
3 // license that can be found in the LICENSE file.
11 typedef struct __go_type_descriptor descriptor;
12 typedef const struct __go_type_descriptor const_descriptor;
13 typedef struct __go_interface interface;
14 typedef struct __go_empty_interface empty_interface;
16 // Compare two type descriptors.
17 func ifacetypeeq(a *descriptor, b *descriptor) (eq bool) {
18 eq = __go_type_descriptors_equal(a, b);
21 // Return the descriptor for an empty interface type.n
22 func efacetype(e empty_interface) (d *const_descriptor) {
23 return e.__type_descriptor;
26 // Return the descriptor for a non-empty interface type.
27 func ifacetype(i interface) (d *const_descriptor) {
28 if (i.__methods == nil) {
34 // Convert an empty interface to an empty interface.
35 func ifaceE2E2(e empty_interface) (ret empty_interface, ok bool) {
37 ok = ret.__type_descriptor != nil;
40 // Convert a non-empty interface to an empty interface.
41 func ifaceI2E2(i interface) (ret empty_interface, ok bool) {
42 if (i.__methods == nil) {
43 ret.__type_descriptor = nil;
47 ret.__type_descriptor = i.__methods[0];
48 ret.__object = i.__object;
53 // Convert an empty interface to a non-empty interface.
54 func ifaceE2I2(inter *descriptor, e empty_interface) (ret interface, ok bool) {
55 if (e.__type_descriptor == nil) {
60 ret.__methods = __go_convert_interface_2(inter,
63 ret.__object = e.__object;
64 ok = ret.__methods != nil;
68 // Convert a non-empty interface to a non-empty interface.
69 func ifaceI2I2(inter *descriptor, i interface) (ret interface, ok bool) {
70 if (i.__methods == nil) {
75 ret.__methods = __go_convert_interface_2(inter,
77 ret.__object = i.__object;
78 ok = ret.__methods != nil;
82 // Convert an empty interface to a pointer type.
83 func ifaceE2T2P(inter *descriptor, e empty_interface) (ret *void, ok bool) {
84 if (!__go_type_descriptors_equal(inter, e.__type_descriptor)) {
93 // Convert a non-empty interface to a pointer type.
94 func ifaceI2T2P(inter *descriptor, i interface) (ret *void, ok bool) {
95 if (i.__methods == nil
96 || !__go_type_descriptors_equal(inter, i.__methods[0])) {
105 // Convert an empty interface to a non-pointer type.
106 func ifaceE2T2(inter *descriptor, e empty_interface, ret *void) (ok bool) {
107 if (!__go_type_descriptors_equal(inter, e.__type_descriptor)) {
108 __builtin_memset(ret, 0, inter->__size);
111 __builtin_memcpy(ret, e.__object, inter->__size);
116 // Convert a non-empty interface to a non-pointer type.
117 func ifaceI2T2(inter *descriptor, i interface, ret *void) (ok bool) {
118 if (i.__methods == nil
119 || !__go_type_descriptors_equal(inter, i.__methods[0])) {
120 __builtin_memset(ret, 0, inter->__size);
123 __builtin_memcpy(ret, i.__object, inter->__size);
128 // Return whether we can convert an interface to a type.
129 func ifaceI2Tp(to *descriptor, from *descriptor) (ok bool) {
130 ok = __go_can_convert_to_interface(to, from);