hotspot/src/share/vm/gc/g1/dirtyCardQueue.hpp
author jprovino
Fri, 26 Feb 2016 14:02:39 -0500
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8139651: ConcurrentG1Refine uses ints for many of its members that should be unsigned types Summary: ints need to be changed to size_t Reviewed-by: kbarrett, tbenson
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/*
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 * Copyright (c) 2001, 2016, Oracle and/or its affiliates. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 *
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 */
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#ifndef SHARE_VM_GC_G1_DIRTYCARDQUEUE_HPP
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#define SHARE_VM_GC_G1_DIRTYCARDQUEUE_HPP
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#include "gc/g1/ptrQueue.hpp"
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#include "memory/allocation.hpp"
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class FreeIdSet;
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class DirtyCardQueueSet;
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// A closure class for processing card table entries.  Note that we don't
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// require these closure objects to be stack-allocated.
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class CardTableEntryClosure: public CHeapObj<mtGC> {
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public:
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  // Process the card whose card table entry is "card_ptr".  If returns
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  // "false", terminate the iteration early.
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  virtual bool do_card_ptr(jbyte* card_ptr, uint worker_i = 0) = 0;
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};
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// A ptrQueue whose elements are "oops", pointers to object heads.
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class DirtyCardQueue: public PtrQueue {
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  DirtyCardQueue(DirtyCardQueueSet* qset, bool permanent = false);
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  // Flush before destroying; queue may be used to capture pending work while
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  // doing something else, with auto-flush on completion.
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  ~DirtyCardQueue();
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  // Process queue entries and release resources.
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  void flush() { flush_impl(); }
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  // Apply the closure to all elements, and reset the index to make the
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  // buffer empty.  If a closure application returns "false", return
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  // "false" immediately, halting the iteration.  If "consume" is true,
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  // deletes processed entries from logs.
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  bool apply_closure(CardTableEntryClosure* cl,
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                     bool consume = true,
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                     uint worker_i = 0);
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  // Apply the closure to all elements of "buf", down to "index"
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  // (inclusive.)  If returns "false", then a closure application returned
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  // "false", and we return immediately.  If "consume" is true, entries are
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  // set to NULL as they are processed, so they will not be processed again
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  // later.
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  static bool apply_closure_to_buffer(CardTableEntryClosure* cl,
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                                      void** buf, size_t index, size_t sz,
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                                      bool consume = true,
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                                      uint worker_i = 0);
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  void **get_buf() { return _buf;}
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  size_t get_index() { return _index;}
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  void reinitialize() { _buf = 0; _sz = 0; _index = 0;}
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  // Compiler support.
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  static ByteSize byte_offset_of_index() {
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    return PtrQueue::byte_offset_of_index<DirtyCardQueue>();
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  }
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  using PtrQueue::byte_width_of_index;
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  static ByteSize byte_offset_of_buf() {
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    return PtrQueue::byte_offset_of_buf<DirtyCardQueue>();
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  }
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  using PtrQueue::byte_width_of_buf;
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};
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class DirtyCardQueueSet: public PtrQueueSet {
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  // The closure used in mut_process_buffer().
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  CardTableEntryClosure* _mut_process_closure;
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  DirtyCardQueue _shared_dirty_card_queue;
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  // Override.
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  bool mut_process_buffer(void** buf);
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  // Protected by the _cbl_mon.
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  FreeIdSet* _free_ids;
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  // The number of completed buffers processed by mutator and rs thread,
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  // respectively.
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  jint _processed_buffers_mut;
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  jint _processed_buffers_rs_thread;
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  // Current buffer node used for parallel iteration.
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  BufferNode* volatile _cur_par_buffer_node;
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public:
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  DirtyCardQueueSet(bool notify_when_complete = true);
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  void initialize(CardTableEntryClosure* cl,
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                  Monitor* cbl_mon,
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                  Mutex* fl_lock,
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                  int process_completed_threshold,
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                  int max_completed_queue,
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                  Mutex* lock,
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                  DirtyCardQueueSet* fl_owner,
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                  bool init_free_ids = false);
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  // The number of parallel ids that can be claimed to allow collector or
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  // mutator threads to do card-processing work.
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  static uint num_par_ids();
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  static void handle_zero_index_for_thread(JavaThread* t);
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  // If there exists some completed buffer, pop it, then apply the
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  // specified closure to all its elements, nulling out those elements
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  // processed.  If all elements are processed, returns "true".  If no
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  // completed buffers exist, returns false.  If a completed buffer exists,
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  // but is only partially completed before a "yield" happens, the
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  // partially completed buffer (with its processed elements set to NULL)
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  // is returned to the completed buffer set, and this call returns false.
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  bool apply_closure_to_completed_buffer(CardTableEntryClosure* cl,
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                                         uint worker_i,
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                                         size_t stop_at,
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                                         bool during_pause);
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  BufferNode* get_completed_buffer(size_t stop_at);
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  // Applies the current closure to all completed buffers,
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  // non-consumptively.
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  void apply_closure_to_all_completed_buffers(CardTableEntryClosure* cl);
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  void reset_for_par_iteration() { _cur_par_buffer_node = _completed_buffers_head; }
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  // Applies the current closure to all completed buffers, non-consumptively.
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  // Parallel version.
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  void par_apply_closure_to_all_completed_buffers(CardTableEntryClosure* cl);
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  DirtyCardQueue* shared_dirty_card_queue() {
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    return &_shared_dirty_card_queue;
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  }
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  // Deallocate any completed log buffers
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  void clear();
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  // If a full collection is happening, reset partial logs, and ignore
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  // completed ones: the full collection will make them all irrelevant.
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  void abandon_logs();
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  // If any threads have partial logs, add them to the global list of logs.
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  void concatenate_logs();
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  void clear_n_completed_buffers() { _n_completed_buffers = 0;}
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  jint processed_buffers_mut() {
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    return _processed_buffers_mut;
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  }
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  jint processed_buffers_rs_thread() {
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    return _processed_buffers_rs_thread;
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  }
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};
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#endif // SHARE_VM_GC_G1_DIRTYCARDQUEUE_HPP