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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-alloc.h"
#include "go-assert.h"
#include "go-panic.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 uintptr_t makechan (const struct __go_type_descriptor *, uint32_t)
asm ("libgo_reflect.reflect.makechan");
uintptr_t
makechan (const struct __go_type_descriptor *typ, uint32_t size)
{
struct __go_channel *channel;
void *ret;
channel = __go_new_channel (typ, size);
ret = __go_alloc (sizeof (void *));
__builtin_memcpy (ret, &channel, sizeof (void *));
return (uintptr_t) ret;
}
extern _Bool chansend (uintptr_t, uintptr_t, _Bool)
asm ("libgo_reflect.reflect.chansend");
_Bool
chansend (uintptr_t ch, uintptr_t val_i, _Bool nb)
{
struct __go_channel *channel = (struct __go_channel *) ch;
uintptr_t element_size;
void *pv;
if (channel == NULL)
__go_panic_msg ("send to nil channel");
if (__go_is_pointer_type (channel->element_type))
pv = &val_i;
else
pv = (void *) val_i;
element_size = channel->element_type->__size;
if (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, pv, element_size);
#else
__builtin_memcpy (u.b + sizeof (uint64_t) - element_size, pv,
element_size);
#endif
if (nb)
return __go_send_nonblocking_small (channel, u.v);
else
{
__go_send_small (channel, u.v, 0);
return 1;
}
}
else
{
if (nb)
return __go_send_nonblocking_big (channel, pv);
else
{
__go_send_big (channel, pv, 0);
return 1;
}
}
}
struct chanrecv_ret
{
uintptr_t val;
_Bool selected;
_Bool received;
};
extern struct chanrecv_ret chanrecv (uintptr_t, _Bool)
asm ("libgo_reflect.reflect.chanrecv");
struct chanrecv_ret
chanrecv (uintptr_t ch, _Bool nb)
{
struct __go_channel *channel = (struct __go_channel *) ch;
void *pv;
uintptr_t element_size;
struct chanrecv_ret ret;
element_size = channel->element_type->__size;
if (__go_is_pointer_type (channel->element_type))
pv = &ret.val;
else
{
pv = __go_alloc (element_size);
ret.val = (uintptr_t) pv;
}
if (element_size <= sizeof (uint64_t))
{
union
{
char b[sizeof (uint64_t)];
uint64_t v;
} u;
if (!nb)
{
u.v = __go_receive_small_closed (channel, 0, &ret.received);
ret.selected = 1;
}
else
{
struct __go_receive_nonblocking_small s;
s = __go_receive_nonblocking_small (channel);
ret.selected = s.__success || s.__closed;
ret.received = s.__success;
u.v = s.__val;
}
#ifndef WORDS_BIGENDIAN
__builtin_memcpy (pv, u.b, element_size);
#else
__builtin_memcpy (pv, u.b + sizeof (uint64_t) - element_size,
element_size);
#endif
}
else
{
if (!nb)
{
ret.received = __go_receive_big (channel, pv, 0);
ret.selected = 1;
}
else
{
_Bool got;
_Bool closed;
got = __go_receive_nonblocking_big (channel, pv, &closed);
ret.selected = got || closed;
ret.received = got;
}
}
return ret;
}
extern void chanclose (uintptr_t) asm ("libgo_reflect.reflect.chanclose");
void
chanclose (uintptr_t ch)
{
struct __go_channel *channel = (struct __go_channel *) ch;
__go_builtin_close (channel);
}
extern int32_t chanlen (uintptr_t) asm ("libgo_reflect.reflect.chanlen");
int32_t
chanlen (uintptr_t ch)
{
struct __go_channel *channel = (struct __go_channel *) ch;
return (int32_t) __go_chan_len (channel);
}
extern int32_t chancap (uintptr_t) asm ("libgo_reflect.reflect.chancap");
int32_t
chancap (uintptr_t ch)
{
struct __go_channel *channel = (struct __go_channel *) ch;
return (int32_t) __go_chan_cap (channel);
}
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