1 /*
   2  * Copyright (c) 2001, 2016, 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_G1_G1REMSET_INLINE_HPP
  26 #define SHARE_VM_GC_G1_G1REMSET_INLINE_HPP
  27 
  28 #include "gc/g1/g1RemSet.hpp"
  29 #include "gc/g1/heapRegion.hpp"
  30 #include "gc/g1/heapRegionRemSet.hpp"
  31 #include "oops/oop.inline.hpp"
  32 
  33 inline uint G1RemSet::n_workers() {
  34   return _g1->workers()->total_workers();
  35 }
  36 
  37 template <class T>
  38 inline void G1RemSet::par_write_ref(HeapRegion* from, T* p, uint tid) {
  39   oop obj = oopDesc::load_decode_heap_oop(p);
  40   if (obj == NULL) {
  41     return;
  42   }
  43 
  44 #ifdef ASSERT
  45   // can't do because of races
  46   // assert(obj == NULL || obj->is_oop(), "expected an oop");
  47 
  48   // Do the safe subset of is_oop
  49 #ifdef CHECK_UNHANDLED_OOPS
  50   oopDesc* o = obj.obj();
  51 #else
  52   oopDesc* o = obj;
  53 #endif // CHECK_UNHANDLED_OOPS
  54   assert(((intptr_t)o & MinObjAlignmentInBytesMask) == 0, "not oop aligned");
  55   assert(_g1->is_in_reserved(obj), "must be in heap");
  56 #endif // ASSERT
  57 
  58   assert(from->is_in_reserved(p) || from->is_starts_humongous(), "p is not in from");
  59 
  60   HeapRegion* to = _g1->heap_region_containing(obj);
  61   if (from != to) {
  62     assert(to->rem_set() != NULL, "Need per-region 'into' remsets.");
  63     to->rem_set()->add_reference(p, tid);
  64   }
  65 }
  66 
  67 template <class T>
  68 inline void UpdateRSOopClosure::do_oop_work(T* p) {
  69   assert(_from != NULL, "from region must be non-NULL");
  70   _rs->par_write_ref(_from, p, _worker_i);
  71 }
  72 
  73 #endif // SHARE_VM_GC_G1_G1REMSET_INLINE_HPP