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 "gc/shared/barrierSetAssembler.hpp"
28 #include "gc/shared/barrierSetNMethod.hpp"
29 #include "runtime/thread.hpp"
30 #include "utilities/debug.hpp"
31 #include "utilities/macros.hpp"
32 
33 BarrierSet* BarrierSet::_barrier_set = NULL;
34 
35 void BarrierSet::set_barrier_set(BarrierSet* barrier_set) {
36   assert(_barrier_set == NULL, "Already initialized");
37   _barrier_set = barrier_set;
38 
39   // Notify barrier set of the current (main) thread.  Normally the
40   // Thread constructor deals with this, but the main thread is
41   // created before we get here.  Verify it isn't yet on the thread
42   // list, else we'd also need to call BarrierSet::on_thread_attach.
43   // This is the only thread that can exist at this point; the Thread
44   // constructor objects to other threads being created before the
45   // barrier set is available.
46   assert(Thread::current()->is_Java_thread(),
47          "Expected main thread to be a JavaThread");
48   assert(!JavaThread::current()->on_thread_list(),
49          "Main thread already on thread list.");
50   _barrier_set->on_thread_create(Thread::current());
51   BarrierSetNMethod* bs_nm = barrier_set->barrier_set_nmethod();
52   Thread::current()->set_nmethod_disarm_value(bs_nm->disarmed_value());
53 }
54 
55 BarrierSet::BarrierSet(BarrierSetAssembler* barrier_set_assembler,
56                        BarrierSetC1* barrier_set_c1,
57                        BarrierSetC2* barrier_set_c2,
58                        BarrierSetNMethod* barrier_set_nmethod,
59                        const FakeRtti& fake_rtti) :
60   _fake_rtti(fake_rtti),
61   _barrier_set_assembler(barrier_set_assembler),
62   _barrier_set_c1(barrier_set_c1),
63   _barrier_set_c2(barrier_set_c2),
64   _barrier_set_nmethod(barrier_set_nmethod != NULL ? barrier_set_nmethod : new BarrierSetNMethod()) {
65 }
66 
67 // Called from init.cpp
68 void gc_barrier_stubs_init() {
69   BarrierSet* bs = BarrierSet::barrier_set();
70 #ifndef ZERO
71   BarrierSetAssembler* bs_assembler = bs->barrier_set_assembler();
72   bs_assembler->barrier_stubs_init();
73 #endif
74 }