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.
12 typedef struct __go_type_descriptor descriptor;
13 typedef const struct __go_type_descriptor const_descriptor;
14 typedef struct __go_interface interface;
15 typedef struct __go_empty_interface empty_interface;
17 // Compare two type descriptors.
18 func ifacetypeeq(a *descriptor, b *descriptor) (eq bool) {
19 eq = __go_type_descriptors_equal(a, b);
22 // Return the descriptor for an empty interface type.n
23 func efacetype(e empty_interface) (d *const_descriptor) {
24 return e.__type_descriptor;
27 // Return the descriptor for a non-empty interface type.
28 func ifacetype(i interface) (d *const_descriptor) {
29 if (i.__methods == nil) {
35 // Convert an empty interface to an empty interface.
36 func ifaceE2E2(e empty_interface) (ret empty_interface, ok bool) {
37 if(((uintptr_t)e.__type_descriptor&reflectFlags) != 0)
38 __go_panic_msg("invalid interface value");
40 ok = ret.__type_descriptor != nil;
43 // Convert a non-empty interface to an empty interface.
44 func ifaceI2E2(i interface) (ret empty_interface, ok bool) {
45 if (i.__methods == nil) {
46 ret.__type_descriptor = nil;
50 ret.__type_descriptor = i.__methods[0];
51 ret.__object = i.__object;
56 // Convert an empty interface to a non-empty interface.
57 func ifaceE2I2(inter *descriptor, e empty_interface) (ret interface, ok bool) {
58 if(((uintptr_t)e.__type_descriptor&reflectFlags) != 0)
59 __go_panic_msg("invalid interface value");
60 if (e.__type_descriptor == nil) {
65 ret.__methods = __go_convert_interface_2(inter,
68 ret.__object = e.__object;
69 ok = ret.__methods != nil;
73 // Convert a non-empty interface to a non-empty interface.
74 func ifaceI2I2(inter *descriptor, i interface) (ret interface, ok bool) {
75 if (i.__methods == nil) {
80 ret.__methods = __go_convert_interface_2(inter,
82 ret.__object = i.__object;
83 ok = ret.__methods != nil;
87 // Convert an empty interface to a pointer type.
88 func ifaceE2T2P(inter *descriptor, e empty_interface) (ret *void, ok bool) {
89 if(((uintptr_t)e.__type_descriptor&reflectFlags) != 0)
90 __go_panic_msg("invalid interface value");
91 if (!__go_type_descriptors_equal(inter, e.__type_descriptor)) {
100 // Convert a non-empty interface to a pointer type.
101 func ifaceI2T2P(inter *descriptor, i interface) (ret *void, ok bool) {
102 if (i.__methods == nil
103 || !__go_type_descriptors_equal(inter, i.__methods[0])) {
112 // Convert an empty interface to a non-pointer type.
113 func ifaceE2T2(inter *descriptor, e empty_interface, ret *void) (ok bool) {
114 if(((uintptr_t)e.__type_descriptor&reflectFlags) != 0)
115 __go_panic_msg("invalid interface value");
116 if (!__go_type_descriptors_equal(inter, e.__type_descriptor)) {
117 __builtin_memset(ret, 0, inter->__size);
120 __builtin_memcpy(ret, e.__object, inter->__size);
125 // Convert a non-empty interface to a non-pointer type.
126 func ifaceI2T2(inter *descriptor, i interface, ret *void) (ok bool) {
127 if (i.__methods == nil
128 || !__go_type_descriptors_equal(inter, i.__methods[0])) {
129 __builtin_memset(ret, 0, inter->__size);
132 __builtin_memcpy(ret, i.__object, inter->__size);
137 // Return whether we can convert an interface to a type.
138 func ifaceI2Tp(to *descriptor, from *descriptor) (ok bool) {
139 ok = __go_can_convert_to_interface(to, from);