libgo/runtime/go-unsafe-new.c

   1 /* go-unsafe-new.c -- unsafe.New function for Go.
   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 "runtime.h"
   8 #include "go-alloc.h"
   9 #include "go-type.h"
  10 #include "interface.h"
  11
  12 /* Implement unsafe_New, called from the reflect package.  */
  13
  14 void *unsafe_New (struct __go_empty_interface type)
  15   asm ("reflect.unsafe_New");
  16
  17 /* The dynamic type of the argument will be a pointer to a type
  18    descriptor.  */
  19
  20 void *
  21 unsafe_New (struct __go_empty_interface type)
  22 {
  23   const struct __go_type_descriptor *descriptor;
  24
  25   if (((uintptr_t) type.__type_descriptor & reflectFlags) != 0)
  26     runtime_panicstring ("invalid interface value");
  27
  28   /* FIXME: We should check __type_descriptor to verify that this is
  29      really a type descriptor.  */
  30   descriptor = (const struct __go_type_descriptor *) type.__object;
  31   return __go_alloc (descriptor->__size);
  32 }