hotspot/src/share/vm/gc_implementation/g1/dirtyCardQueue.hpp
author jwilhelm
Thu, 03 Oct 2013 21:36:29 +0200
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child 23855 c4574075402c
permissions -rw-r--r--
8025852: Remove unnecessary setters in collector policy classes Summary: Use instance variables directly within the collector policy classes and remove unused setters. Reviewed-by: tschatzl, jcoomes
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/*
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 * Copyright (c) 2001, 2012, 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_IMPLEMENTATION_G1_DIRTYCARDQUEUE_HPP
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#define SHARE_VM_GC_IMPLEMENTATION_G1_DIRTYCARDQUEUE_HPP
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#include "gc_implementation/g1/ptrQueue.hpp"
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#include "memory/allocation.hpp"
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class FreeIdSet;
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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, int 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(PtrQueueSet* qset_, bool perm = false) :
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    // Dirty card queues are always active, so we create them with their
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    // active field set to true.
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    PtrQueue(qset_, perm, true /* active */) { }
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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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                     size_t 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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                                      int worker_i = 0);
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  void **get_buf() { return _buf;}
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  void set_buf(void **buf) {_buf = 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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};
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class DirtyCardQueueSet: public PtrQueueSet {
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  CardTableEntryClosure* _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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  DirtyCardQueueSet(bool notify_when_complete = true);
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  void initialize(Monitor* cbl_mon, 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, PtrQueueSet* fl_owner = NULL);
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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 size_t num_par_ids();
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  static void handle_zero_index_for_thread(JavaThread* t);
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  // Register "blk" as "the closure" for all queues.  Only one such closure
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  // is allowed.  The "apply_closure_to_completed_buffer" method will apply
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  // this closure to a completed buffer, and "iterate_closure_all_threads"
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  // applies it to partially-filled buffers (the latter should only be done
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  // with the world stopped).
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  void set_closure(CardTableEntryClosure* closure);
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  // If there is a registered closure for buffers, apply it to all entries
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  // in all currently-active buffers.  This should only be applied at a
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  // safepoint.  (Currently must not be called in parallel; this should
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  // change in the future.)  If "consume" is true, processed entries are
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  // discarded.
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  void iterate_closure_all_threads(bool consume = true,
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                                   size_t worker_i = 0);
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  // If there exists some completed buffer, pop it, then apply the
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  // registered 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(int worker_i = 0,
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                                         int stop_at = 0,
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                                         bool during_pause = false);
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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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                                         int worker_i = 0,
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                                         int stop_at = 0,
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                                         bool during_pause = false);
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  // Helper routine for the above.
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  bool apply_closure_to_completed_buffer_helper(CardTableEntryClosure* cl,
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                                                int worker_i,
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                                                BufferNode* nd);
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  BufferNode* get_completed_buffer(int 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();
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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_IMPLEMENTATION_G1_DIRTYCARDQUEUE_HPP