1 /*
 2  * Copyright (c) 2019, 2021, Red Hat, Inc. 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/shenandoah/heuristics/shenandoahAdaptiveHeuristics.hpp"
27 #include "gc/shenandoah/heuristics/shenandoahAggressiveHeuristics.hpp"
28 #include "gc/shenandoah/heuristics/shenandoahCompactHeuristics.hpp"
29 #include "gc/shenandoah/heuristics/shenandoahStaticHeuristics.hpp"
30 #include "gc/shenandoah/mode/shenandoahSATBMode.hpp"
31 #include "logging/log.hpp"
32 #include "logging/logTag.hpp"
33 #include "runtime/globals_extension.hpp"
34 #include "runtime/java.hpp"
35 
36 void ShenandoahSATBMode::initialize_flags() const {
37   if (ClassUnloading) {
38     FLAG_SET_DEFAULT(ShenandoahSuspendibleWorkers, true);
39     FLAG_SET_DEFAULT(VerifyBeforeExit, false);
40   }
41 
42   SHENANDOAH_ERGO_ENABLE_FLAG(ExplicitGCInvokesConcurrent);
43   SHENANDOAH_ERGO_ENABLE_FLAG(ShenandoahImplicitGCInvokesConcurrent);
44 
45   // Final configuration checks
46   SHENANDOAH_CHECK_FLAG_SET(ShenandoahLoadRefBarrier);
47   SHENANDOAH_CHECK_FLAG_UNSET(ShenandoahIUBarrier);
48   SHENANDOAH_CHECK_FLAG_SET(ShenandoahSATBBarrier);
49   SHENANDOAH_CHECK_FLAG_SET(ShenandoahCASBarrier);
50   SHENANDOAH_CHECK_FLAG_SET(ShenandoahCloneBarrier);
51   SHENANDOAH_CHECK_FLAG_SET(ShenandoahNMethodBarrier);
52   SHENANDOAH_CHECK_FLAG_SET(ShenandoahStackWatermarkBarrier);
53 }
54 
55 ShenandoahHeuristics* ShenandoahSATBMode::initialize_heuristics() const {
56   if (ShenandoahGCHeuristics != NULL) {
57     if (strcmp(ShenandoahGCHeuristics, "aggressive") == 0) {
58       return new ShenandoahAggressiveHeuristics();
59     } else if (strcmp(ShenandoahGCHeuristics, "static") == 0) {
60       return new ShenandoahStaticHeuristics();
61     } else if (strcmp(ShenandoahGCHeuristics, "adaptive") == 0) {
62       return new ShenandoahAdaptiveHeuristics();
63     } else if (strcmp(ShenandoahGCHeuristics, "compact") == 0) {
64       return new ShenandoahCompactHeuristics();
65     } else {
66       vm_exit_during_initialization("Unknown -XX:ShenandoahGCHeuristics option");
67     }
68   }
69   ShouldNotReachHere();
70   return NULL;
71 }