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products/sources/formale Sprachen/Java/Openjdk/src/hotspot/share/gc/shared/ (Sun/Oracle ^©) Datei vom 13.11.2022 mit Größe 2 kB

Quelle gcArguments.hpp Sprache: C

/*
* Copyright (c) 2018, 2020, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2017, Red Hat, Inc. and/or its affiliates.
* 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*
*/

#ifndef SHARE_GC_SHARED_GCARGUMENTS_HPP
#define SHARE_GC_SHARED_GCARGUMENTS_HPP

#include "memory/allocation.hpp"

class CollectedHeap;

extern size_t HeapAlignment;
extern size_t SpaceAlignment;

class GCArguments {
protected:
  // Initialize HeapAlignment, SpaceAlignment, and extra alignments (E.g. GenAlignment)
  virtual void initialize_alignments() = 0;
  virtual void initialize_heap_flags_and_sizes();
  virtual void initialize_size_info();

  DEBUG_ONLY(void assert_flags();)
  DEBUG_ONLY(void assert_size_info();)

public:
  virtual void initialize();
  virtual size_t conservative_max_heap_alignment() = 0;

  // Used by heap size heuristics to determine max
  // amount of address space to use for the heap.
  virtual size_t heap_virtual_to_physical_ratio();

  virtual CollectedHeap* create_heap() = 0;

  // Allows GCs to tell external code if it's supported or not in the current setup.
  virtual bool is_supported() const {
    return true;
  }

  void initialize_heap_sizes();

  static size_t compute_heap_alignment();
};

#endif // SHARE_GC_SHARED_GCARGUMENTS_HPP

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