xpcom/tests/ShowAlignments.cpp

   1 /* vim: set shiftwidth=2 tabstop=8 autoindent cindent expandtab: */
   2 /* ***** BEGIN LICENSE BLOCK *****
   3  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
   4  *
   5  * The contents of this file are subject to the Mozilla Public License Version
   6  * 1.1 (the "License"); you may not use this file except in compliance with
   7  * the License. You may obtain a copy of the License at
   8  * http://www.mozilla.org/MPL/
   9  *
  10  * Software distributed under the License is distributed on an "AS IS" basis,
  11  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
  12  * for the specific language governing rights and limitations under the
  13  * License.
  14  *
  15  * The Original Code is ShowAlignments.cpp.
  16  *
  17  * The Initial Developer of the Original Code is the Mozilla Foundation.
  18  * Portions created by the Initial Developer are Copyright (C) 2010
  19  * the Initial Developer. All Rights Reserved.
  20  *
  21  * Contributor(s):
  22  *   L. David Baron <dbaron@dbaron.org>, Mozilla Corporation (original author)
  23  *
  24  * Alternatively, the contents of this file may be used under the terms of
  25  * either the GNU General Public License Version 2 or later (the "GPL"), or
  26  * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
  27  * in which case the provisions of the GPL or the LGPL are applicable instead
  28  * of those above. If you wish to allow use of your version of this file only
  29  * under the terms of either the GPL or the LGPL, and not to allow others to
  30  * use your version of this file under the terms of the MPL, indicate your
  31  * decision by deleting the provisions above and replace them with the notice
  32  * and other provisions required by the GPL or the LGPL. If you do not delete
  33  * the provisions above, a recipient may use your version of this file under
  34  * the terms of any one of the MPL, the GPL or the LGPL.
  35  *
  36  * ***** END LICENSE BLOCK ***** */
  37
  38 /* show the size and alignment requirements of various types */
  39
  40 #include "nsMemory.h"
  41 #include <stdio.h>
  42
  43 struct S {
  44   double d;
  45   char c;
  46   short s;
  47 };
  48
  49 int main()
  50 {
  51   static const char str[] =
  52     "Type %s has size %u and alignment requirement %u\n";
  53   #define SHOW_TYPE(t_) \
  54     printf(str, #t_, unsigned(sizeof(t_)), unsigned(NS_ALIGNMENT_OF(t_)))
  55
  56   SHOW_TYPE(char);
  57   SHOW_TYPE(unsigned short);
  58   SHOW_TYPE(int);
  59   SHOW_TYPE(long);
  60   SHOW_TYPE(PRUint8);
  61   SHOW_TYPE(PRInt16);
  62   SHOW_TYPE(PRUint32);
  63   SHOW_TYPE(PRFloat64);
  64   SHOW_TYPE(void*);
  65   SHOW_TYPE(double);
  66   SHOW_TYPE(short[7]);
  67   SHOW_TYPE(S);
  68   SHOW_TYPE(double S::*);
  69
  70   return 0;
  71 }