1 /*
   2  * Copyright (c) 2015, 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 #include "precompiled.hpp"
  26 #include "code/nmethod.hpp"
  27 #include "gc/g1/g1CodeBlobClosure.hpp"
  28 #include "gc/g1/g1CollectedHeap.inline.hpp"
  29 #include "gc/g1/heapRegion.hpp"
  30 #include "gc/g1/heapRegionRemSet.hpp"
  31 #include "oops/access.inline.hpp"
  32 #include "oops/compressedOops.inline.hpp"
  33 #include "oops/oop.inline.hpp"
  34 
  35 template <typename T>
  36 void G1CodeBlobClosure::HeapRegionGatheringOopClosure::do_oop_work(T* p) {
  37   _work->do_oop(p);
  38   T oop_or_narrowoop = RawAccess<>::oop_load(p);
  39   if (!CompressedOops::is_null(oop_or_narrowoop)) {
  40     oop o = CompressedOops::decode_not_null(oop_or_narrowoop);
  41     HeapRegion* hr = _g1h->heap_region_containing(o);
  42     assert(!_g1h->is_in_cset(o) || hr->rem_set()->strong_code_roots_list_contains(_nm), "if o still in collection set then evacuation failed and nm must already be in the remset");
  43     hr->add_strong_code_root(_nm);
  44   }
  45 }
  46 
  47 void G1CodeBlobClosure::HeapRegionGatheringOopClosure::do_oop(oop* o) {
  48   do_oop_work(o);
  49 }
  50 
  51 void G1CodeBlobClosure::HeapRegionGatheringOopClosure::do_oop(narrowOop* o) {
  52   do_oop_work(o);
  53 }
  54 
  55 void G1CodeBlobClosure::do_code_blob(CodeBlob* cb) {
  56   nmethod* nm = cb->as_nmethod_or_null();
  57   if (nm != NULL) {
  58     if (!nm->test_set_oops_do_mark()) {
  59       _oc.set_nm(nm);
  60       nm->oops_do_keepalive(&_oc, _keepalive_is_strong);
  61       nm->fix_oop_relocations();
  62     }
  63   }
  64 }
  65