1 /*
   2  * Copyright (c) 2007, 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_CMS_CMSOOPCLOSURES_INLINE_HPP
  26 #define SHARE_VM_GC_CMS_CMSOOPCLOSURES_INLINE_HPP
  27 
  28 #include "gc/cms/cmsOopClosures.hpp"
  29 #include "gc/cms/concurrentMarkSweepGeneration.hpp"
  30 #include "gc/shared/taskqueue.inline.hpp"
  31 #include "oops/oop.inline.hpp"
  32 
  33 // MetadataAwareOopClosure and MetadataAwareOopsInGenClosure are duplicated,
  34 // until we get rid of OopsInGenClosure.
  35 
  36 inline void MetadataAwareOopsInGenClosure::do_klass_nv(Klass* k) {
  37   ClassLoaderData* cld = k->class_loader_data();
  38   do_cld_nv(cld);
  39 }
  40 inline void MetadataAwareOopsInGenClosure::do_klass(Klass* k) { do_klass_nv(k); }
  41 
  42 inline void MetadataAwareOopsInGenClosure::do_cld_nv(ClassLoaderData* cld) {
  43   assert(_klass_closure._oop_closure == this, "Must be");
  44 
  45   bool claim = true;  // Must claim the class loader data before processing.
  46   cld->oops_do(_klass_closure._oop_closure, &_klass_closure, claim);
  47 }
  48 
  49 // Decode the oop and call do_oop on it.
  50 #define DO_OOP_WORK_IMPL(cls)                                 \
  51   template <class T> void cls::do_oop_work(T* p) {            \
  52     T heap_oop = oopDesc::load_heap_oop(p);                   \
  53     if (!oopDesc::is_null(heap_oop)) {                        \
  54       oop obj = oopDesc::decode_heap_oop_not_null(heap_oop);  \
  55       do_oop(obj);                                            \
  56     }                                                         \
  57   }
  58 
  59 #define DO_OOP_WORK_NV_IMPL(cls)                              \
  60   DO_OOP_WORK_IMPL(cls)                                       \
  61   void cls::do_oop_nv(oop* p)       { cls::do_oop_work(p); }  \
  62   void cls::do_oop_nv(narrowOop* p) { cls::do_oop_work(p); }
  63 
  64 DO_OOP_WORK_IMPL(MarkRefsIntoClosure)
  65 DO_OOP_WORK_IMPL(ParMarkRefsIntoClosure)
  66 DO_OOP_WORK_IMPL(MarkRefsIntoVerifyClosure)
  67 DO_OOP_WORK_NV_IMPL(PushAndMarkClosure)
  68 DO_OOP_WORK_NV_IMPL(ParPushAndMarkClosure)
  69 DO_OOP_WORK_NV_IMPL(MarkRefsIntoAndScanClosure)
  70 DO_OOP_WORK_NV_IMPL(ParMarkRefsIntoAndScanClosure)
  71 
  72 // Trim our work_queue so its length is below max at return
  73 inline void ParMarkRefsIntoAndScanClosure::trim_queue(uint max) {
  74   while (_work_queue->size() > max) {
  75     oop newOop;
  76     if (_work_queue->pop_local(newOop)) {
  77       assert(oopDesc::is_oop(newOop), "Expected an oop");
  78       assert(_bit_map->isMarked((HeapWord*)newOop),
  79              "only grey objects on this stack");
  80       // iterate over the oops in this oop, marking and pushing
  81       // the ones in CMS heap (i.e. in _span).
  82       newOop->oop_iterate(&_parPushAndMarkClosure);
  83     }
  84   }
  85 }
  86 
  87 DO_OOP_WORK_NV_IMPL(PushOrMarkClosure)
  88 DO_OOP_WORK_NV_IMPL(ParPushOrMarkClosure)
  89 DO_OOP_WORK_NV_IMPL(CMSKeepAliveClosure)
  90 DO_OOP_WORK_NV_IMPL(CMSInnerParMarkAndPushClosure)
  91 DO_OOP_WORK_IMPL(CMSParKeepAliveClosure)
  92 
  93 #endif // SHARE_VM_GC_CMS_CMSOOPCLOSURES_INLINE_HPP