libgo/runtime/go-construct-map.c

   1 /* go-construct-map.c -- construct a map from an initializer.
   2
   3    Copyright 2009 The Go Authors. All rights reserved.
   4    Use of this source code is governed by a BSD-style
   5    license that can be found in the LICENSE file.  */
   6
   7 #include <stddef.h>
   8 #include <stdint.h>
   9 #include <stdlib.h>
  10
  11 #include "runtime.h"
  12 #include "go-type.h"
  13
  14 extern void *makemap (const struct __go_map_type *, int64_t hint,
  15                       void *, void *)
  16   __asm__ (GOSYM_PREFIX "runtime.makemap");
  17
  18 extern void *mapassign (const struct __go_map_type *, void *hmap,
  19                         const void *key)
  20   __asm__ (GOSYM_PREFIX "runtime.mapassign");
  21
  22 void *
  23 __go_construct_map (const struct __go_map_type *type,
  24                     uintptr_t count, uintptr_t entry_size,
  25                     uintptr_t val_offset, const void *ventries)
  26 {
  27   void *ret;
  28   const unsigned char *entries;
  29   uintptr_t i;
  30   void *p;
  31
  32   ret = makemap(type, (int64_t) count, NULL, NULL);
  33
  34   entries = (const unsigned char *) ventries;
  35   for (i = 0; i < count; ++i)
  36     {
  37       p = mapassign (type, ret, entries);
  38       typedmemmove (type->__val_type, p, entries + val_offset);
  39       entries += entry_size;
  40     }
  41
  42   return ret;
  43 }