1 /*
   2  * Copyright (c) 2001, 2015, 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 #ifndef SHARE_VM_GC_PARALLEL_PSMARKSWEEP_HPP
  26 #define SHARE_VM_GC_PARALLEL_PSMARKSWEEP_HPP
  27 
  28 #include "gc/serial/markSweep.hpp"
  29 #include "gc/shared/collectorCounters.hpp"
  30 #include "gc/shared/referenceProcessor.hpp"
  31 #include "utilities/stack.hpp"
  32 
  33 class PSAdaptiveSizePolicy;
  34 class PSYoungGen;
  35 class PSOldGen;
  36 
  37 class PSMarkSweep : public MarkSweep {
  38  private:
  39   static elapsedTimer        _accumulated_time;
  40   static jlong               _time_of_last_gc;   // ms
  41   static CollectorCounters*  _counters;
  42 
  43   static SpanSubjectToDiscoveryClosure _span_discoverer;
  44 
  45   // Closure accessors
  46   static OopClosure* mark_and_push_closure()   { return &MarkSweep::mark_and_push_closure; }
  47   static VoidClosure* follow_stack_closure()   { return &MarkSweep::follow_stack_closure; }
  48   static CLDClosure* follow_cld_closure()      { return &MarkSweep::follow_cld_closure; }
  49   static OopClosure* adjust_pointer_closure()  { return &MarkSweep::adjust_pointer_closure; }
  50   static CLDClosure* adjust_cld_closure()      { return &MarkSweep::adjust_cld_closure; }
  51   static BoolObjectClosure* is_alive_closure() { return &MarkSweep::is_alive; }
  52 
  53   // Mark live objects
  54   static void mark_sweep_phase1(bool clear_all_softrefs);
  55   // Calculate new addresses
  56   static void mark_sweep_phase2();
  57   // Update pointers
  58   static void mark_sweep_phase3();
  59   // Move objects to new positions
  60   static void mark_sweep_phase4();
  61 
  62   // Temporary data structures for traversal and storing/restoring marks
  63   static void allocate_stacks();
  64   static void deallocate_stacks();
  65 
  66   // If objects are left in eden after a collection, try to move the boundary
  67   // and absorb them into the old gen.  Returns true if eden was emptied.
  68   static bool absorb_live_data_from_eden(PSAdaptiveSizePolicy* size_policy,
  69                                          PSYoungGen* young_gen,
  70                                          PSOldGen* old_gen);
  71 
  72   // Reset time since last full gc
  73   static void reset_millis_since_last_gc();
  74 
  75  public:
  76   static void invoke(bool clear_all_softrefs);
  77   static bool invoke_no_policy(bool clear_all_softrefs);
  78 
  79   static void initialize();
  80 
  81   // Public accessors
  82   static elapsedTimer* accumulated_time() { return &_accumulated_time; }
  83   static CollectorCounters* counters()    { return _counters; }
  84 
  85   // Time since last full gc (in milliseconds)
  86   static jlong millis_since_last_gc();
  87 };
  88 
  89 #endif // SHARE_VM_GC_PARALLEL_PSMARKSWEEP_HPP