1 /* 2 * Copyright (c) 2015, 2018, 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 #include "precompiled.hpp" 26 #include "gc/g1/g1OopClosures.inline.hpp" 27 #include "gc/g1/g1RootClosures.hpp" 28 #include "gc/g1/g1SharedClosures.hpp" 29 30 // Closures used for standard G1 evacuation. 31 class G1EvacuationClosures : public G1EvacuationRootClosures { 32 G1SharedClosures<G1MarkNone> _closures; 33 34 public: 35 G1EvacuationClosures(G1CollectedHeap* g1h, 36 G1ParScanThreadState* pss, 37 bool in_young_gc) : 38 _closures(g1h, pss, in_young_gc) {} 39 40 OopClosure* weak_oops() { return &_closures._oops; } 41 OopClosure* strong_oops() { return &_closures._oops; } 42 43 CLDClosure* weak_clds() { return &_closures._clds; } 44 CLDClosure* strong_clds() { return &_closures._clds; } 45 46 CodeBlobClosure* strong_codeblobs() { return &_closures._codeblobs; } 47 CodeBlobClosure* weak_codeblobs() { return &_closures._codeblobs; } 48 }; 49 50 // Closures used during concurrent start. 51 // The treatment of "weak" roots is selectable through the template parameter, 52 // this is usually used to control unloading of classes and interned strings. 53 template <G1Mark MarkWeak> 54 class G1ConcurrentStartMarkClosures : public G1EvacuationRootClosures { 55 G1SharedClosures<G1MarkFromRoot> _strong; 56 G1SharedClosures<MarkWeak> _weak; 57 58 public: 59 G1ConcurrentStartMarkClosures(G1CollectedHeap* g1h, 60 G1ParScanThreadState* pss) : 61 _strong(g1h, pss, /* process_only_dirty_klasses */ false), 62 _weak(g1h, pss, /* process_only_dirty_klasses */ false) {} 63 64 OopClosure* weak_oops() { return &_weak._oops; } 65 OopClosure* strong_oops() { return &_strong._oops; } 66 67 CLDClosure* weak_clds() { return &_weak._clds; } 68 CLDClosure* strong_clds() { return &_strong._clds; } 69 70 CodeBlobClosure* strong_codeblobs() { return &_strong._codeblobs; } 71 CodeBlobClosure* weak_codeblobs() { return &_weak._codeblobs; } 72 }; 73 74 G1EvacuationRootClosures* G1EvacuationRootClosures::create_root_closures(G1ParScanThreadState* pss, G1CollectedHeap* g1h) { 75 G1EvacuationRootClosures* res = NULL; 76 if (g1h->collector_state()->in_concurrent_start_gc()) { 77 if (ClassUnloadingWithConcurrentMark) { 78 res = new G1ConcurrentStartMarkClosures<G1MarkPromotedFromRoot>(g1h, pss); 79 } else { 80 res = new G1ConcurrentStartMarkClosures<G1MarkFromRoot>(g1h, pss); 81 } 82 } else { 83 res = new G1EvacuationClosures(g1h, pss, g1h->collector_state()->in_young_only_phase()); 84 } 85 return res; 86 }