libgo/runtime/reflect.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 reflect
   6 #include "go-type.h"
   7 #include "interface.h"
   8 #define nil NULL
   9 typedef unsigned char byte;
  10
  11 typedef struct __go_interface Iface;
  12 typedef struct __go_empty_interface Eface;
  13
  14 func setiface(typ *byte, x *byte, ret *byte) {
  15         struct __go_interface_type *t;
  16         const struct __go_type_descriptor* xt;
  17
  18         /* FIXME: We should check __type_descriptor to verify that
  19            this is really a type descriptor.  */
  20         t = (struct __go_interface_type *)typ;
  21         if(t->__methods.__count == 0) {
  22                 // already an empty interface
  23                 *(Eface*)ret = *(Eface*)x;
  24                 return;
  25         }
  26         xt = ((Eface*)x)->__type_descriptor;
  27         if(xt == nil) {
  28                 // can assign nil to any interface
  29                 ((Iface*)ret)->__methods = nil;
  30                 ((Iface*)ret)->__object = nil;
  31                 return;
  32         }
  33         ((Iface*)ret)->__methods = __go_convert_interface(&t->__common, xt);
  34         ((Iface*)ret)->__object = ((Eface*)x)->__object;
  35 }