1 /*
   2  * Copyright (c) 2014, 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 #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 "gc/g1/g1_specialized_oop_closures.hpp"
  30 #include "memory/iterator.inline.hpp"
  31 #include "utilities/stack.inline.hpp"
  32 
  33 G1ParCopyHelper::G1ParCopyHelper(G1CollectedHeap* g1,  G1ParScanThreadState* par_scan_state) :
  34   _g1(g1),
  35   _par_scan_state(par_scan_state),
  36   _worker_id(par_scan_state->worker_id()),
  37   _scanned_cld(NULL),
  38   _cm(_g1->concurrent_mark())
  39 { }
  40 
  41 G1ScanClosureBase::G1ScanClosureBase(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state) :
  42   _g1(g1), _par_scan_state(par_scan_state), _from(NULL)
  43 { }
  44 
  45 void G1CLDScanClosure::do_cld(ClassLoaderData* cld) {
  46   // If the class loader data has not been dirtied we know that there's
  47   // no references into  the young gen and we can skip it.
  48   if (!_process_only_dirty || cld->has_modified_oops()) {
  49 
  50     // Tell the closure that this class loader data is the CLD to scavenge
  51     // and is the one to dirty if oops are left pointing into the young gen.
  52     _closure->set_scanned_cld(cld);
  53 
  54     // Clean the cld since we're going to scavenge all the metadata.
  55     // Clear modified oops only if this cld is claimed.
  56     cld->oops_do(_closure, _must_claim, /*clear_modified_oops*/true);
  57 
  58     _closure->set_scanned_cld(NULL);
  59   }
  60   _count++;
  61 }
  62 
  63 // Generate G1 specialized oop_oop_iterate functions.
  64 SPECIALIZED_OOP_OOP_ITERATE_CLOSURES_G1(ALL_KLASS_OOP_OOP_ITERATE_DEFN)