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 "arch.h"
   9 #include "malloc.h"
  10 #include "go-type.h"
  11 #include "interface.h"
  12
  13 /* Implement unsafe_New, called from the reflect package.  */
  14
  15 void *unsafe_New (const struct __go_type_descriptor *)
  16   __asm__ (GOSYM_PREFIX "reflect.unsafe_New");
  17
  18 /* The dynamic type of the argument will be a pointer to a type
  19    descriptor.  */
  20
  21 void *
  22 unsafe_New (const struct __go_type_descriptor *descriptor)
  23 {
  24   uint32 flag;
  25   void *ret;
  26
  27   flag = (descriptor->__code & GO_NO_POINTERS) != 0 ? FlagNoPointers : 0;
  28   ret = runtime_mallocgc (descriptor->__size, flag, 1, 1);
  29
  30   if (UseSpanType && flag == 0)
  31     runtime_settype (ret, (uintptr) descriptor | TypeInfo_SingleObject);
  32
  33   return ret;
  34 }