1 /*
   2  * Copyright (c) 2018, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #ifndef SHARE_VM_GC_SHARED_FILL_HPP
  26 #define SHARE_VM_GC_SHARED_FILL_HPP
  27 
  28 #include "memory/allocation.hpp"
  29 #include "utilities/globalDefinitions.hpp"
  30 
  31 class Fill : public AllStatic {
  32 private:
  33   static bool   _disabled;
  34   static size_t _extra_header_size;
  35   static size_t _min_size;
  36   static size_t _max_size;
  37 
  38   static size_t object_header_size();
  39   static size_t array_header_size();
  40   static size_t array_max_payload_size();
  41   static size_t array_length(size_t size);
  42 
  43   static void fill_with_object(HeapWord* start);
  44   static void fill_with_array(HeapWord* start, size_t size);
  45 
  46 public:
  47   static void initialize();
  48   static void set_disabled();
  49   static void set_extra_header_size(size_t extra_header_size);
  50   static void set_max_size(size_t max_size);
  51 
  52   static size_t min_size() { return _min_size; }
  53   static size_t max_size() { return _max_size; }
  54   static size_t min_reserve_size();
  55 
  56   static void range(HeapWord* start, size_t size);
  57   static void range(HeapWord* start, HeapWord* end);
  58 };
  59 
  60 #endif // SHARE_VM_GC_SHARED_FILL_HPP