1 /* go-reflect-chan.c -- channel reflection support for Go.
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. */
14 /* This file implements support for reflection on channels. These
15 functions are called from reflect/value.go. */
17 extern unsigned char *makechan (const struct __go_type_descriptor *, uint32_t)
18 asm ("libgo_reflect.reflect.makechan");
21 makechan (const struct __go_type_descriptor *typ, uint32_t size)
23 return (unsigned char *) __go_new_channel (typ->__size, size);
26 extern void chansend (unsigned char *, unsigned char *, _Bool *)
27 asm ("libgo_reflect.reflect.chansend");
30 chansend (unsigned char *ch, unsigned char *val, _Bool *selected)
32 struct __go_channel *channel = (struct __go_channel *) ch;
34 if (channel->element_size <= sizeof (uint64_t))
38 char b[sizeof (uint64_t)];
42 __builtin_memset (u.b, 0, sizeof (uint64_t));
43 #ifndef WORDS_BIGENDIAN
44 __builtin_memcpy (u.b, val, channel->element_size);
46 __builtin_memcpy (u.b + sizeof (uint64_t) - channel->element_size, val,
47 channel->element_size);
50 __go_send_small (channel, u.v, 0);
52 *selected = __go_send_nonblocking_small (channel, u.v);
57 __go_send_big (channel, val, 0);
59 *selected = __go_send_nonblocking_big (channel, val);
63 extern void chanrecv (unsigned char *, unsigned char *, _Bool *, _Bool *)
64 asm ("libgo_reflect.reflect.chanrecv");
67 chanrecv (unsigned char *ch, unsigned char *val, _Bool *selected,
70 struct __go_channel *channel = (struct __go_channel *) ch;
72 if (channel->element_size <= sizeof (uint64_t))
76 char b[sizeof (uint64_t)];
81 u.v = __go_receive_small_closed (channel, 0, received);
84 struct __go_receive_nonblocking_small s;
86 s = __go_receive_nonblocking_small (channel);
87 *selected = s.__success || s.__closed;
89 *received = s.__success;
93 #ifndef WORDS_BIGENDIAN
94 __builtin_memcpy (val, u.b, channel->element_size);
96 __builtin_memcpy (val, u.b + sizeof (uint64_t) - channel->element_size,
97 channel->element_size);
102 if (selected == NULL)
106 success = __go_receive_big (channel, val, 0);
107 if (received != NULL)
115 got = __go_receive_nonblocking_big (channel, val, &closed);
116 *selected = got || closed;
117 if (received != NULL)
123 extern _Bool chanclosed (unsigned char *)
124 asm ("libgo_reflect.reflect.chanclosed");
127 chanclosed (unsigned char *ch)
129 struct __go_channel *channel = (struct __go_channel *) ch;
131 return __go_builtin_closed (channel);
134 extern void chanclose (unsigned char *)
135 asm ("libgo_reflect.reflect.chanclose");
138 chanclose (unsigned char *ch)
140 struct __go_channel *channel = (struct __go_channel *) ch;
142 __go_builtin_close (channel);
145 extern int32_t chanlen (unsigned char *) asm ("libgo_reflect.reflect.chanlen");
148 chanlen (unsigned char *ch)
150 struct __go_channel *channel = (struct __go_channel *) ch;
152 return (int32_t) __go_chan_len (channel);
155 extern int32_t chancap (unsigned char *) asm ("libgo_reflect.reflect.chancap");
158 chancap (unsigned char *ch)
160 struct __go_channel *channel = (struct __go_channel *) ch;
162 return (int32_t) __go_chan_cap (channel);