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