1 /*
   2  * Copyright (c) 1997, 2018, 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 "gc/shared/barrierSet.hpp"
  27 #include "oops/oop.hpp"
  28 #include "gc/shared/barrierSetAssembler.hpp"
  29 #include "runtime/thread.hpp"
  30 #include "utilities/macros.hpp"
  31 
  32 BarrierSet* BarrierSet::_barrier_set = NULL;
  33 
  34 void BarrierSet::set_barrier_set(BarrierSet* barrier_set) {
  35   assert(_barrier_set == NULL, "Already initialized");
  36   _barrier_set = barrier_set;
  37 
  38   // The barrier set was not initialized when the this thread (the main thread)
  39   // was created, so the call to BarrierSet::on_thread_create() had to be deferred
  40   // until we have a barrier set. Now we have a barrier set, so we make the call.
  41   _barrier_set->on_thread_create(Thread::current());
  42 }
  43 
  44 // Called from init.cpp
  45 void gc_barrier_stubs_init() {
  46   BarrierSet* bs = BarrierSet::barrier_set();
  47 #ifndef ZERO
  48   BarrierSetAssembler* bs_assembler = bs->barrier_set_assembler();
  49   bs_assembler->barrier_stubs_init();
  50 #endif
  51 }
  52 
  53 #ifdef ASSERT
  54 void BarrierSet::verify_safe_oop(oop p) {
  55   // Do nothing
  56 }
  57 #endif