view src/share/vm/gc_implementation/parallelScavenge/asPSYoungGen.hpp @ 1091:6aa7255741f3

6906727: UseCompressedOops: some card-marking fixes related to object arrays Summary: Introduced a new write_ref_array(HeapWords* start, size_t count) method that does the requisite MemRegion range calculation so (some of the) clients of the erstwhile write_ref_array(MemRegion mr) do not need to worry. This removed all external uses of array_size(), which was also simplified and made private. Asserts were added to catch other possible issues. Further, less essential, fixes stemming from this investigation are deferred to CR 6904516 (to follow shortly in hs17). Reviewed-by: kvn, coleenp, jmasa
author ysr
date Thu, 03 Dec 2009 15:01:57 -0800
parents a61af66fc99e
children c18cbe5936b8
line wrap: on
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/*
 * Copyright 2003 Sun Microsystems, Inc.  All Rights Reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
 * CA 95054 USA or visit www.sun.com if you need additional information or
 * have any questions.
 *
 */

class ASPSYoungGen : public PSYoungGen {
  friend class VMStructs;
 private:
  size_t _gen_size_limit;
 protected:
  virtual size_t available_to_live();

 public:
  ASPSYoungGen(size_t         initial_byte_size,
               size_t         minimum_byte_size,
               size_t         byte_size_limit);

  ASPSYoungGen(PSVirtualSpace* vs,
               size_t         initial_byte_size,
               size_t         minimum_byte_size,
               size_t         byte_size_limit);

  void initialize(ReservedSpace rs, size_t alignment);
  void initialize_virtual_space(ReservedSpace rs, size_t alignment);

  size_t gen_size_limit() { return _gen_size_limit; }
  void set_gen_size_limit(size_t v) { _gen_size_limit = v; }

  bool resize_generation(size_t eden_size, size_t survivor_size);
  void resize_spaces(size_t eden_size, size_t survivor_size);

  // Adjust eden to be consistent with the virtual space.
  void reset_after_change();

  // Adaptive size policy support
  // Return number of bytes that the generation can expand/contract.
  size_t available_for_expansion();
  size_t available_for_contraction();

  // Accessors
  void set_reserved(MemRegion v) { _reserved = v; }

  // Printing support
  virtual const char* short_name() const { return "ASPSYoungGen"; }
};