gcc-4.8/libgo/runtime/go-unsafe-newarray.c


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/* go-unsafe-newarray.c -- unsafe.NewArray function for Go.

   Copyright 2009 The Go Authors. All rights reserved.
   Use of this source code is governed by a BSD-style
   license that can be found in the LICENSE file.  */

#include "runtime.h"
#include "arch.h"
#include "malloc.h"
#include "go-type.h"
#include "interface.h"

/* Implement unsafe_NewArray, called from the reflect package.  */

void *unsafe_NewArray (const struct __go_type_descriptor *, intgo)
  __asm__ (GOSYM_PREFIX "reflect.unsafe_NewArray");

/* The dynamic type of the argument will be a pointer to a type
   descriptor.  */

void *
unsafe_NewArray (const struct __go_type_descriptor *descriptor, intgo n)
{
  uint64 size;
  void *ret;

  size = n * descriptor->__size;
  if (size == 0)
    ret = &runtime_zerobase;
  else if ((descriptor->__code & GO_NO_POINTERS) != 0)
    ret = runtime_mallocgc (size, FlagNoPointers, 1, 1);
  else
    {
      ret = runtime_mallocgc (size, 0, 1, 1);

      if (UseSpanType)
	runtime_settype (ret, (uintptr) descriptor | TypeInfo_Array);
    }

  return ret;
}