1 /* 2 * Copyright (c) 2001, 2013, 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_IMPLEMENTATION_G1_G1MARKSWEEP_HPP 26 #define SHARE_VM_GC_IMPLEMENTATION_G1_G1MARKSWEEP_HPP 27 28 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp" 29 #include "gc_implementation/g1/heapRegion.hpp" 30 #include "memory/genMarkSweep.hpp" 31 #include "memory/generation.hpp" 32 #include "memory/universe.hpp" 33 #include "oops/markOop.hpp" 34 #include "oops/oop.hpp" 35 #include "runtime/timer.hpp" 36 #include "utilities/growableArray.hpp" 37 38 class ReferenceProcessor; 39 40 // G1MarkSweep takes care of global mark-compact garbage collection for a 41 // G1CollectedHeap using a four-phase pointer forwarding algorithm. All 42 // generations are assumed to support marking; those that can also support 43 // compaction. 44 // 45 // Class unloading will only occur when a full gc is invoked. 46 class G1PrepareCompactClosure; 47 48 class G1MarkSweep : AllStatic { 49 friend class VM_G1MarkSweep; 50 friend class Scavenge; 51 52 public: 53 54 static void invoke_at_safepoint(ReferenceProcessor* rp, 55 bool clear_all_softrefs); 56 57 static STWGCTimer* gc_timer() { return GenMarkSweep::_gc_timer; } 58 static SerialOldTracer* gc_tracer() { return GenMarkSweep::_gc_tracer; } 59 60 private: 61 62 // Mark live objects 63 static void mark_sweep_phase1(bool& marked_for_deopt, 64 bool clear_all_softrefs); 65 // Calculate new addresses 66 static void mark_sweep_phase2(); 67 // Update pointers 68 static void mark_sweep_phase3(); 69 // Move objects to new positions 70 static void mark_sweep_phase4(); 71 72 static void allocate_stacks(); 73 static void prepare_compaction(); 74 static void prepare_compaction_work(G1PrepareCompactClosure* blk); 75 }; 76 77 class G1PrepareCompactClosure : public HeapRegionClosure { 78 protected: 79 G1CollectedHeap* _g1h; 80 ModRefBarrierSet* _mrbs; 81 CompactPoint _cp; 82 HeapRegionSetCount _humongous_regions_removed; 83 84 virtual void prepare_for_compaction(HeapRegion* hr, HeapWord* end); 85 void prepare_for_compaction_work(CompactPoint* cp, HeapRegion* hr, HeapWord* end); 86 void free_humongous_region(HeapRegion* hr); 87 bool is_cp_initialized() const { return _cp.space != NULL; } 88 89 public: 90 G1PrepareCompactClosure() : 91 _g1h(G1CollectedHeap::heap()), 92 _mrbs(_g1h->g1_barrier_set()), 93 _humongous_regions_removed() { } 94 95 void update_sets(); 96 bool doHeapRegion(HeapRegion* hr); 97 }; 98 99 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1MARKSWEEP_HPP