1 /* 2 * Copyright (c) 2001, 2017, 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_G1_G1MARKSWEEP_HPP 26 #define SHARE_VM_GC_G1_G1MARKSWEEP_HPP 27 28 #include "gc/g1/g1CardTable.hpp" 29 #include "gc/g1/g1CollectedHeap.hpp" 30 #include "gc/g1/heapRegion.hpp" 31 #include "gc/serial/genMarkSweep.hpp" 32 #include "gc/shared/generation.hpp" 33 #include "memory/universe.hpp" 34 #include "oops/markOop.hpp" 35 #include "oops/oop.hpp" 36 #include "runtime/timer.hpp" 37 #include "utilities/growableArray.hpp" 38 39 class ReferenceProcessor; 40 41 // G1MarkSweep takes care of global mark-compact garbage collection for a 42 // G1CollectedHeap using a four-phase pointer forwarding algorithm. All 43 // generations are assumed to support marking; those that can also support 44 // compaction. 45 // 46 // Class unloading will only occur when a full gc is invoked. 47 class G1PrepareCompactClosure; 48 class G1ArchiveRegionMap; 49 50 class G1MarkSweep : AllStatic { 51 public: 52 53 static void invoke_at_safepoint(ReferenceProcessor* rp, 54 bool clear_all_softrefs); 55 56 static STWGCTimer* gc_timer() { return GenMarkSweep::_gc_timer; } 57 static SerialOldTracer* gc_tracer() { return GenMarkSweep::_gc_tracer; } 58 59 private: 60 // Mark live objects 61 static void mark_sweep_phase1(bool& marked_for_deopt, 62 bool clear_all_softrefs); 63 // Calculate new addresses 64 static void mark_sweep_phase2(); 65 // Update pointers 66 static void mark_sweep_phase3(); 67 // Move objects to new positions 68 static void mark_sweep_phase4(); 69 70 static void allocate_stacks(); 71 static void prepare_compaction(); 72 static void prepare_compaction_work(G1PrepareCompactClosure* blk); 73 }; 74 75 class G1PrepareCompactClosure : public HeapRegionClosure { 76 protected: 77 G1CollectedHeap* _g1h; 78 G1CardTable *_ct; 79 CompactPoint _cp; 80 uint _humongous_regions_removed; 81 82 virtual void prepare_for_compaction(HeapRegion* hr, HeapWord* end); 83 void prepare_for_compaction_work(CompactPoint* cp, HeapRegion* hr, HeapWord* end); 84 void free_humongous_region(HeapRegion* hr); 85 bool is_cp_initialized() const { return _cp.space != NULL; } 86 87 public: 88 G1PrepareCompactClosure() : 89 _g1h(G1CollectedHeap::heap()), 90 _ct(_g1h->g1_card_table()), 91 _humongous_regions_removed(0) { } 92 93 void update_sets(); 94 bool doHeapRegion(HeapRegion* hr); 95 }; 96 97 #endif // SHARE_VM_GC_G1_G1MARKSWEEP_HPP