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