hphp/runtime/vm/object_allocator_sizes.h

   1 /*
   2    +----------------------------------------------------------------------+
   3    | HipHop for PHP                                                       |
   4    +----------------------------------------------------------------------+
   5    | Copyright (c) 2010-2013 Facebook, Inc. (http://www.facebook.com)     |
   6    +----------------------------------------------------------------------+
   7    | This source file is subject to version 3.01 of the PHP license,      |
   8    | that is bundled with this package in the file LICENSE, and is        |
   9    | available through the world-wide-web at the following url:           |
  10    | http://www.php.net/license/3_01.txt                                  |
  11    | If you did not receive a copy of the PHP license and are unable to   |
  12    | obtain it through the world-wide-web, please send a note to          |
  13    | license@php.net so we can mail you a copy immediately.               |
  14    +----------------------------------------------------------------------+
  15 */
  16
  17 #ifndef incl_HPHP_OBJECT_ALLOCATOR_SIZES_H_
  18 #define incl_HPHP_OBJECT_ALLOCATOR_SIZES_H_
  19
  20 namespace HPHP {
  21
  22 // SmartAllocator (or, to be more specific, ObjectAllocator) is templatized
  23 // by the size of the chunks it allocates. This works fine when we're only
  24 // allocating objects of fixed sizes, known at compile time. However, the
  25 // ObjectData class is of variable size (having room for a property vector
  26 // at the end), and the range of sizes it will take on is unknowable at
  27 // compile time.
  28 //
  29 // To work around this, we instantiate the ObjectAllocator template with a size
  30 // from every possible size class. This way, any size class that ObjectData
  31 // might end up falling into will have an ObjectAllocator.
  32 int InitializeAllocators();
  33
  34 }
  35
  36 #endif