1 /* 2 * Copyright (c) 2014, 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/g1CollectedHeap.inline.hpp" 27 #include "gc/g1/g1OopClosures.inline.hpp" 28 #include "gc/g1/g1ParScanThreadState.hpp" 29 #include "memory/iterator.inline.hpp" 30 #include "utilities/stack.inline.hpp" 31 32 G1ParCopyHelper::G1ParCopyHelper(G1CollectedHeap* g1h, G1ParScanThreadState* par_scan_state) : 33 _g1h(g1h), 34 _par_scan_state(par_scan_state), 35 _worker_id(par_scan_state->worker_id()), 36 _scanned_cld(NULL), 37 _cm(_g1h->concurrent_mark()) 38 { } 39 40 G1ScanClosureBase::G1ScanClosureBase(G1CollectedHeap* g1h, G1ParScanThreadState* par_scan_state) : 41 _g1h(g1h), _par_scan_state(par_scan_state), _from_is_young(true) 42 { } 43 44 void G1CLDScanClosure::do_cld(ClassLoaderData* cld) { 45 // If the class loader data has not been dirtied we know that there's 46 // no references into the young gen and we can skip it. 47 if (!_process_only_dirty || cld->has_modified_oops()) { 48 49 // Tell the closure that this class loader data is the CLD to scavenge 50 // and is the one to dirty if oops are left pointing into the young gen. 51 _closure->set_scanned_cld(cld); 52 53 // Clean the cld since we're going to scavenge all the metadata. 54 // Clear modified oops only if this cld is claimed. 55 cld->oops_do(_closure, _claim, /*clear_modified_oops*/true); 56 57 _closure->set_scanned_cld(NULL); 58 59 _closure->trim_queue_partially(); 60 } 61 _count++; 62 }