libgo/runtime/map.goc

   1 // Copyright 2010 The Go Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style
   3 // license that can be found in the LICENSE file.
   4
   5 package runtime
   6 #include "map.h"
   7 #define nil NULL
   8
   9 typedef unsigned char byte;
  10 typedef _Bool bool;
  11
  12 typedef struct __go_map hmap;
  13 typedef struct __go_hash_iter hiter;
  14
  15 /* Access a value in a map, returning a value and a presence indicator.  */
  16
  17 func mapaccess2(h *hmap, key *byte, val *byte) (present bool) {
  18         byte *mapval;
  19         size_t valsize;
  20
  21         mapval = __go_map_index(h, key, 0);
  22         valsize = h->__descriptor->__map_descriptor->__val_type->__size;
  23         if (mapval == nil) {
  24                 __builtin_memset(val, 0, valsize);
  25                 present = 0;
  26         } else {
  27                 __builtin_memcpy(val, mapval, valsize);
  28                 present = 1;
  29         }
  30 }
  31
  32 /* Optionally assign a value to a map (m[k] = v, p).  */
  33
  34 func mapassign2(h *hmap, key *byte, val *byte, p bool) {
  35         if (!p) {
  36                 __go_map_delete(h, key);
  37         } else {
  38                 byte *mapval;
  39                 size_t valsize;
  40
  41                 mapval = __go_map_index(h, key, 1);
  42                 valsize = h->__descriptor->__map_descriptor->__val_type->__size;
  43                 __builtin_memcpy(mapval, val, valsize);
  44         }
  45 }
  46
  47 /* Initialize a range over a map.  */
  48
  49 func mapiterinit(h *hmap, it *hiter) {
  50         __go_mapiterinit(h, it);
  51 }
  52
  53 /* Move to the next iteration, updating *HITER.  */
  54
  55 func mapiternext(it *hiter) {
  56         __go_mapiternext(it);
  57 }
  58
  59 /* Get the key of the current iteration.  */
  60
  61 func mapiter1(it *hiter, key *byte) {
  62         __go_mapiter1(it, key);
  63 }
  64
  65 /* Get the key and value of the current iteration.  */
  66
  67 func mapiter2(it *hiter, key *byte, val *byte) {
  68         __go_mapiter2(it, key, val);
  69 }