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 #include "runtime.h"
   9 #include "go-panic.h"
  10
  11 typedef struct __go_type_descriptor Type;
  12 typedef struct __go_interface Iface;
  13 typedef struct __go_empty_interface Eface;
  14
  15 func ifaceE2I(inter *Type, e Eface, ret *Iface) {
  16         const Type *t;
  17         Eface err;
  18
  19         if(((uintptr)e.__type_descriptor&reflectFlags) != 0)
  20                 runtime_throw("invalid interface value");
  21         t = e.__type_descriptor;
  22         if(t == nil) {
  23                 // explicit conversions require non-nil interface value.
  24                 newTypeAssertionError(nil, nil, inter,
  25                         nil, nil, inter->__reflection,
  26                         nil, &err);
  27                 __go_panic(err);
  28         }
  29         ret->__object = e.__object;
  30         ret->__methods = __go_convert_interface(inter, t);
  31 }