153 lines
3.5 KiB
C
153 lines
3.5 KiB
C
/* go-reflect-chan.c -- channel reflection support for Go.
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Copyright 2009 The Go Authors. All rights reserved.
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Use of this source code is governed by a BSD-style
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license that can be found in the LICENSE file. */
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#include <stdlib.h>
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#include <stdint.h>
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#include "config.h"
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#include "go-type.h"
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#include "channel.h"
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/* This file implements support for reflection on channels. These
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functions are called from reflect/value.go. */
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extern unsigned char *makechan (const struct __go_type_descriptor *, uint32_t)
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asm ("libgo_reflect.reflect.makechan");
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unsigned char *
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makechan (const struct __go_type_descriptor *typ, uint32_t size)
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{
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return (unsigned char *) __go_new_channel (typ->__size, size);
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}
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extern void chansend (unsigned char *, unsigned char *, _Bool *)
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asm ("libgo_reflect.reflect.chansend");
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void
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chansend (unsigned char *ch, unsigned char *val, _Bool *selected)
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{
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struct __go_channel *channel = (struct __go_channel *) ch;
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if (channel->element_size <= sizeof (uint64_t))
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{
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union
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{
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char b[sizeof (uint64_t)];
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uint64_t v;
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} u;
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__builtin_memset (u.b, 0, sizeof (uint64_t));
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#ifndef WORDS_BIGENDIAN
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__builtin_memcpy (u.b, val, channel->element_size);
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#else
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__builtin_memcpy (u.b + sizeof (uint64_t) - channel->element_size, val,
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channel->element_size);
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#endif
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if (selected == NULL)
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__go_send_small (channel, u.v, 0);
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else
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*selected = __go_send_nonblocking_small (channel, u.v);
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}
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else
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{
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if (selected == NULL)
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__go_send_big (channel, val, 0);
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else
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*selected = __go_send_nonblocking_big (channel, val);
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}
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}
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extern void chanrecv (unsigned char *, unsigned char *, _Bool *, _Bool *)
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asm ("libgo_reflect.reflect.chanrecv");
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void
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chanrecv (unsigned char *ch, unsigned char *val, _Bool *selected,
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_Bool *received)
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{
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struct __go_channel *channel = (struct __go_channel *) ch;
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if (channel->element_size <= sizeof (uint64_t))
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{
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union
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{
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char b[sizeof (uint64_t)];
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uint64_t v;
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} u;
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if (selected == NULL)
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u.v = __go_receive_small_closed (channel, 0, received);
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else
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{
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struct __go_receive_nonblocking_small s;
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s = __go_receive_nonblocking_small (channel);
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*selected = s.__success || s.__closed;
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if (received != NULL)
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*received = s.__success;
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u.v = s.__val;
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}
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#ifndef WORDS_BIGENDIAN
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__builtin_memcpy (val, u.b, channel->element_size);
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#else
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__builtin_memcpy (val, u.b + sizeof (uint64_t) - channel->element_size,
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channel->element_size);
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#endif
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}
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else
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{
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if (selected == NULL)
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{
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_Bool success;
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success = __go_receive_big (channel, val, 0);
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if (received != NULL)
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*received = success;
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}
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else
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{
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_Bool got;
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_Bool closed;
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got = __go_receive_nonblocking_big (channel, val, &closed);
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*selected = got || closed;
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if (received != NULL)
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*received = got;
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}
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}
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}
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extern void chanclose (unsigned char *)
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asm ("libgo_reflect.reflect.chanclose");
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void
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chanclose (unsigned char *ch)
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{
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struct __go_channel *channel = (struct __go_channel *) ch;
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__go_builtin_close (channel);
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}
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extern int32_t chanlen (unsigned char *) asm ("libgo_reflect.reflect.chanlen");
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int32_t
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chanlen (unsigned char *ch)
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{
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struct __go_channel *channel = (struct __go_channel *) ch;
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return (int32_t) __go_chan_len (channel);
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}
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extern int32_t chancap (unsigned char *) asm ("libgo_reflect.reflect.chancap");
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int32_t
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chancap (unsigned char *ch)
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{
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struct __go_channel *channel = (struct __go_channel *) ch;
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return (int32_t) __go_chan_cap (channel);
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}
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