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/* go-reflect-map.c -- map reflection support for Go.
Copyright 2009, 2010 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 "runtime.h"
#include "go-alloc.h"
#include "go-assert.h"
#include "go-type.h"
#include "map.h"
/* This file implements support for reflection on maps. These
functions are called from reflect/value.go. */
extern void *mapaccess (struct __go_map_type *, void *, void *)
__asm__ (GOSYM_PREFIX "reflect.mapaccess");
void *
mapaccess (struct __go_map_type *mt, void *m, void *key)
{
struct __go_map *map = (struct __go_map *) m;
__go_assert ((mt->__common.__code & GO_CODE_MASK) == GO_MAP);
if (map == NULL)
return NULL;
else
return __go_map_index (map, key, 0);
}
extern void mapassign (struct __go_map_type *, void *, void *, void *)
__asm__ (GOSYM_PREFIX "reflect.mapassign");
void
mapassign (struct __go_map_type *mt, void *m, void *key, void *val)
{
struct __go_map *map = (struct __go_map *) m;
void *p;
__go_assert ((mt->__common.__code & GO_CODE_MASK) == GO_MAP);
if (map == NULL)
runtime_panicstring ("assignment to entry in nil map");
p = __go_map_index (map, key, 1);
__builtin_memcpy (p, val, mt->__val_type->__size);
}
extern void mapdelete (struct __go_map_type *, void *, void *)
__asm__ (GOSYM_PREFIX "reflect.mapdelete");
void
mapdelete (struct __go_map_type *mt, void *m, void *key)
{
struct __go_map *map = (struct __go_map *) m;
__go_assert ((mt->__common.__code & GO_CODE_MASK) == GO_MAP);
if (map == NULL)
return;
__go_map_delete (map, key);
}
extern int32_t maplen (void *) __asm__ (GOSYM_PREFIX "reflect.maplen");
int32_t
maplen (void *m)
{
struct __go_map *map = (struct __go_map *) m;
if (map == NULL)
return 0;
return (int32_t) map->__element_count;
}
extern unsigned char *mapiterinit (struct __go_map_type *, void *)
__asm__ (GOSYM_PREFIX "reflect.mapiterinit");
unsigned char *
mapiterinit (struct __go_map_type *mt, void *m)
{
struct __go_hash_iter *it;
__go_assert ((mt->__common.__code & GO_CODE_MASK) == GO_MAP);
it = __go_alloc (sizeof (struct __go_hash_iter));
__go_mapiterinit ((struct __go_map *) m, it);
return (unsigned char *) it;
}
extern void mapiternext (void *) __asm__ (GOSYM_PREFIX "reflect.mapiternext");
void
mapiternext (void *it)
{
__go_mapiternext ((struct __go_hash_iter *) it);
}
extern void *mapiterkey (void *) __asm__ (GOSYM_PREFIX "reflect.mapiterkey");
void *
mapiterkey (void *ita)
{
struct __go_hash_iter *it = (struct __go_hash_iter *) ita;
const struct __go_type_descriptor *key_descriptor;
void *key;
if (it->entry == NULL)
return NULL;
key_descriptor = it->map->__descriptor->__map_descriptor->__key_type;
key = __go_alloc (key_descriptor->__size);
__go_mapiter1 (it, key);
return key;
}
/* Make a new map. We have to build our own map descriptor. */
extern struct __go_map *makemap (const struct __go_map_type *)
__asm__ (GOSYM_PREFIX "reflect.makemap");
struct __go_map *
makemap (const struct __go_map_type *t)
{
struct __go_map_descriptor *md;
unsigned int o;
const struct __go_type_descriptor *kt;
const struct __go_type_descriptor *vt;
md = (struct __go_map_descriptor *) __go_alloc (sizeof (*md));
md->__map_descriptor = t;
o = sizeof (void *);
kt = t->__key_type;
o = (o + kt->__field_align - 1) & ~ (kt->__field_align - 1);
md->__key_offset = o;
o += kt->__size;
vt = t->__val_type;
o = (o + vt->__field_align - 1) & ~ (vt->__field_align - 1);
md->__val_offset = o;
o += vt->__size;
o = (o + sizeof (void *) - 1) & ~ (sizeof (void *) - 1);
o = (o + kt->__field_align - 1) & ~ (kt->__field_align - 1);
o = (o + vt->__field_align - 1) & ~ (vt->__field_align - 1);
md->__entry_size = o;
return __go_new_map (md, 0);
}
extern _Bool ismapkey (const struct __go_type_descriptor *)
__asm__ (GOSYM_PREFIX "reflect.ismapkey");
_Bool
ismapkey (const struct __go_type_descriptor *typ)
{
return typ != NULL && typ->__hashfn != __go_type_hash_error;
}
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