1 /*
   2  * Copyright (c) 2003, 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 class ASPSYoungGen : public PSYoungGen {
  26   friend class VMStructs;
  27  private:
  28   size_t _gen_size_limit;
  29  protected:
  30   virtual size_t available_to_live();
  31 
  32  public:
  33   ASPSYoungGen(size_t         initial_byte_size,
  34                size_t         minimum_byte_size,
  35                size_t         byte_size_limit);
  36 
  37   ASPSYoungGen(PSVirtualSpace* vs,
  38                size_t         initial_byte_size,
  39                size_t         minimum_byte_size,
  40                size_t         byte_size_limit);
  41 
  42   void initialize(ReservedSpace rs, size_t alignment);
  43   void initialize_virtual_space(ReservedSpace rs, size_t alignment);
  44 
  45   size_t gen_size_limit() { return _gen_size_limit; }
  46   void set_gen_size_limit(size_t v) { _gen_size_limit = v; }
  47 
  48   bool resize_generation(size_t eden_size, size_t survivor_size);
  49   void resize_spaces(size_t eden_size, size_t survivor_size);
  50 
  51   // Adjust eden to be consistent with the virtual space.
  52   void reset_after_change();
  53 
  54   // Adaptive size policy support
  55   // Return number of bytes that the generation can expand/contract.
  56   size_t available_for_expansion();
  57   size_t available_for_contraction();
  58 
  59   // Accessors
  60   void set_reserved(MemRegion v) { _reserved = v; }
  61 
  62   // Printing support
  63   virtual const char* short_name() const { return "ASPSYoungGen"; }
  64 };