1 /*
   2  * Copyright (c) 2001, 2014, 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_G1OOPCLOSURES_INLINE_HPP
  26 #define SHARE_VM_GC_IMPLEMENTATION_G1_G1OOPCLOSURES_INLINE_HPP
  27 
  28 #include "gc_implementation/g1/concurrentMark.inline.hpp"
  29 #include "gc_implementation/g1/g1CollectedHeap.hpp"
  30 #include "gc_implementation/g1/g1OopClosures.hpp"
  31 #include "gc_implementation/g1/g1RemSet.hpp"
  32 #include "gc_implementation/g1/g1RemSet.inline.hpp"
  33 #include "gc_implementation/g1/heapRegionRemSet.hpp"
  34 #include "runtime/prefetch.inline.hpp"
  35 
  36 /*
  37  * This really ought to be an inline function, but apparently the C++
  38  * compiler sometimes sees fit to ignore inline declarations.  Sigh.
  39  */
  40 
  41 template <class T>
  42 inline void FilterIntoCSClosure::do_oop_nv(T* p) {
  43   T heap_oop = oopDesc::load_heap_oop(p);
  44   if (!oopDesc::is_null(heap_oop) &&
  45       _g1->obj_in_cs(oopDesc::decode_heap_oop_not_null(heap_oop))) {
  46     _oc->do_oop(p);
  47   }
  48 }
  49 
  50 template <class T>
  51 inline void FilterOutOfRegionClosure::do_oop_nv(T* p) {
  52   T heap_oop = oopDesc::load_heap_oop(p);
  53   if (!oopDesc::is_null(heap_oop)) {
  54     HeapWord* obj_hw = (HeapWord*)oopDesc::decode_heap_oop_not_null(heap_oop);
  55     if (obj_hw < _r_bottom || obj_hw >= _r_end) {
  56       _oc->do_oop(p);
  57     }
  58   }
  59 }
  60 
  61 // This closure is applied to the fields of the objects that have just been copied.
  62 template <class T>
  63 inline void G1ParScanClosure::do_oop_nv(T* p) {
  64   T heap_oop = oopDesc::load_heap_oop(p);
  65 
  66   if (!oopDesc::is_null(heap_oop)) {
  67     oop obj = oopDesc::decode_heap_oop_not_null(heap_oop);
  68     if (_g1->in_cset_fast_test(obj)) {
  69       // We're not going to even bother checking whether the object is
  70       // already forwarded or not, as this usually causes an immediate
  71       // stall. We'll try to prefetch the object (for write, given that
  72       // we might need to install the forwarding reference) and we'll
  73       // get back to it when pop it from the queue
  74       Prefetch::write(obj->mark_addr(), 0);
  75       Prefetch::read(obj->mark_addr(), (HeapWordSize*2));
  76 
  77       // slightly paranoid test; I'm trying to catch potential
  78       // problems before we go into push_on_queue to know where the
  79       // problem is coming from
  80       assert((obj == oopDesc::load_decode_heap_oop(p)) ||
  81              (obj->is_forwarded() &&
  82                  obj->forwardee() == oopDesc::load_decode_heap_oop(p)),
  83              "p should still be pointing to obj or to its forwardee");
  84 
  85       _par_scan_state->push_on_queue(p);
  86     } else {
  87       _par_scan_state->update_rs(_from, p, _worker_id);
  88     }
  89   }
  90 }
  91 
  92 template <class T>
  93 inline void G1ParPushHeapRSClosure::do_oop_nv(T* p) {
  94   T heap_oop = oopDesc::load_heap_oop(p);
  95 
  96   if (!oopDesc::is_null(heap_oop)) {
  97     oop obj = oopDesc::decode_heap_oop_not_null(heap_oop);
  98     if (_g1->in_cset_fast_test(obj)) {
  99       Prefetch::write(obj->mark_addr(), 0);
 100       Prefetch::read(obj->mark_addr(), (HeapWordSize*2));
 101 
 102       // Place on the references queue
 103       _par_scan_state->push_on_queue(p);
 104     }
 105   }
 106 }
 107 
 108 template <class T>
 109 inline void G1CMOopClosure::do_oop_nv(T* p) {
 110   assert(_g1h->is_in_g1_reserved((HeapWord*) p), "invariant");
 111   assert(!_g1h->is_on_master_free_list(
 112                     _g1h->heap_region_containing((HeapWord*) p)), "invariant");
 113 
 114   oop obj = oopDesc::load_decode_heap_oop(p);
 115   if (_cm->verbose_high()) {
 116     gclog_or_tty->print_cr("[%u] we're looking at location "
 117                            "*"PTR_FORMAT" = "PTR_FORMAT,
 118                            _task->worker_id(), p2i(p), p2i((void*) obj));
 119   }
 120   _task->deal_with_reference(obj);
 121 }
 122 
 123 template <class T>
 124 inline void G1RootRegionScanClosure::do_oop_nv(T* p) {
 125   T heap_oop = oopDesc::load_heap_oop(p);
 126   if (!oopDesc::is_null(heap_oop)) {
 127     oop obj = oopDesc::decode_heap_oop_not_null(heap_oop);
 128     HeapRegion* hr = _g1h->heap_region_containing((HeapWord*) obj);
 129     if (hr != NULL) {
 130       _cm->grayRoot(obj, obj->size(), _worker_id, hr);
 131     }
 132   }
 133 }
 134 
 135 template <class T>
 136 inline void G1Mux2Closure::do_oop_nv(T* p) {
 137   // Apply first closure; then apply the second.
 138   _c1->do_oop(p);
 139   _c2->do_oop(p);
 140 }
 141 
 142 template <class T>
 143 inline void G1TriggerClosure::do_oop_nv(T* p) {
 144   // Record that this closure was actually applied (triggered).
 145   _triggered = true;
 146 }
 147 
 148 template <class T>
 149 inline void G1InvokeIfNotTriggeredClosure::do_oop_nv(T* p) {
 150   if (!_trigger_cl->triggered()) {
 151     _oop_cl->do_oop(p);
 152   }
 153 }
 154 
 155 template <class T>
 156 inline void G1UpdateRSOrPushRefOopClosure::do_oop_nv(T* p) {
 157   oop obj = oopDesc::load_decode_heap_oop(p);
 158 #ifdef ASSERT
 159   // can't do because of races
 160   // assert(obj == NULL || obj->is_oop(), "expected an oop");
 161 
 162   // Do the safe subset of is_oop
 163   if (obj != NULL) {
 164 #ifdef CHECK_UNHANDLED_OOPS
 165     oopDesc* o = obj.obj();
 166 #else
 167     oopDesc* o = obj;
 168 #endif // CHECK_UNHANDLED_OOPS
 169     assert((intptr_t)o % MinObjAlignmentInBytes == 0, "not oop aligned");
 170     assert(Universe::heap()->is_in_reserved(obj), "must be in heap");
 171   }
 172 #endif // ASSERT
 173 
 174   assert(_from != NULL, "from region must be non-NULL");
 175   assert(_from->is_in_reserved(p), "p is not in from");
 176 
 177   HeapRegion* to = _g1->heap_region_containing(obj);
 178   if (to != NULL && _from != to) {
 179     // The _record_refs_into_cset flag is true during the RSet
 180     // updating part of an evacuation pause. It is false at all
 181     // other times:
 182     //  * rebuilding the rembered sets after a full GC
 183     //  * during concurrent refinement.
 184     //  * updating the remembered sets of regions in the collection
 185     //    set in the event of an evacuation failure (when deferred
 186     //    updates are enabled).
 187 
 188     if (_record_refs_into_cset && to->in_collection_set()) {
 189       // We are recording references that point into the collection
 190       // set and this particular reference does exactly that...
 191       // If the referenced object has already been forwarded
 192       // to itself, we are handling an evacuation failure and
 193       // we have already visited/tried to copy this object
 194       // there is no need to retry.
 195       if (!self_forwarded(obj)) {
 196         assert(_push_ref_cl != NULL, "should not be null");
 197         // Push the reference in the refs queue of the G1ParScanThreadState
 198         // instance for this worker thread.
 199         _push_ref_cl->do_oop(p);
 200       }
 201 
 202       // Deferred updates to the CSet are either discarded (in the normal case),
 203       // or processed (if an evacuation failure occurs) at the end
 204       // of the collection.
 205       // See G1RemSet::cleanup_after_oops_into_collection_set_do().
 206       return;
 207     }
 208 
 209     // We either don't care about pushing references that point into the
 210     // collection set (i.e. we're not during an evacuation pause) _or_
 211     // the reference doesn't point into the collection set. Either way
 212     // we add the reference directly to the RSet of the region containing
 213     // the referenced object.
 214     assert(to->rem_set() != NULL, "Need per-region 'into' remsets.");
 215     to->rem_set()->add_reference(p, _worker_i);
 216   }
 217 }
 218 
 219 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1OOPCLOSURES_INLINE_HPP