1 /*
   2  * Copyright (c) 2001, 2012, 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_G1REMSET_INLINE_HPP
  26 #define SHARE_VM_GC_IMPLEMENTATION_G1_G1REMSET_INLINE_HPP
  27 
  28 #include "gc_implementation/g1/g1RemSet.hpp"
  29 #include "gc_implementation/g1/heapRegion.hpp"
  30 #include "gc_implementation/g1/heapRegionRemSet.hpp"
  31 #include "oops/oop.inline.hpp"
  32 
  33 inline uint G1RemSet::n_workers() {
  34   if (_g1->workers() != NULL) {
  35     return _g1->workers()->total_workers();
  36   } else {
  37     return 1;
  38   }
  39 }
  40 
  41 template <class T>
  42 inline void G1RemSet::write_ref(HeapRegion* from, T* p) {
  43   par_write_ref(from, p, 0);
  44 }
  45 
  46 template <class T>
  47 inline void G1RemSet::par_write_ref(HeapRegion* from, T* p, int tid) {
  48   oop obj = oopDesc::load_decode_heap_oop(p);
  49   if (obj == NULL) {
  50     return;
  51   }
  52 
  53 #ifdef ASSERT
  54   // can't do because of races
  55   // assert(obj == NULL || obj->is_oop(), "expected an oop");
  56 
  57   // Do the safe subset of is_oop
  58 #ifdef CHECK_UNHANDLED_OOPS
  59   oopDesc* o = obj.obj();
  60 #else
  61   oopDesc* o = obj;
  62 #endif // CHECK_UNHANDLED_OOPS
  63   assert((intptr_t)o % MinObjAlignmentInBytes == 0, "not oop aligned");
  64   assert(Universe::heap()->is_in_reserved(obj), "must be in heap");
  65 #endif // ASSERT
  66 
  67   assert(from == NULL || from->is_in_reserved(p), "p is not in from");
  68 
  69   HeapRegion* to = _g1->heap_region_containing(obj);
  70   if (from != to) {
  71     assert(to->rem_set() != NULL, "Need per-region 'into' remsets.");
  72     to->rem_set()->add_reference(p, tid);
  73   }
  74 }
  75 
  76 template <class T>
  77 inline void UpdateRSOopClosure::do_oop_work(T* p) {
  78   assert(_from != NULL, "from region must be non-NULL");
  79   _rs->par_write_ref(_from, p, _worker_i);
  80 }
  81 
  82 template <class T>
  83 inline void UpdateRSetImmediate::do_oop_work(T* p) {
  84   assert(_from->is_in_reserved(p), "paranoia");
  85   T heap_oop = oopDesc::load_heap_oop(p);
  86   if (!oopDesc::is_null(heap_oop) && !_from->is_survivor()) {
  87     _g1_rem_set->par_write_ref(_from, p, 0);
  88   }
  89 }
  90 
  91 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1REMSET_INLINE_HPP