1 /*
 2  * Copyright (c) 2020, 2022, 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/shenandoahIUMode.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 ShenandoahIUMode::initialize_flags() const {
37   if (FLAG_IS_CMDLINE(ClassUnloadingWithConcurrentMark) && ClassUnloading) {
38     log_warning(gc)("Shenandoah I-U mode sets -XX:-ClassUnloadingWithConcurrentMark; see JDK-8261341 for details");
39   }
40   FLAG_SET_DEFAULT(ClassUnloadingWithConcurrentMark, false);
41 
42   if (ClassUnloading) {
43     FLAG_SET_DEFAULT(VerifyBeforeExit, false);
44   }
45 
46   if (FLAG_IS_DEFAULT(ShenandoahIUBarrier)) {
47     FLAG_SET_DEFAULT(ShenandoahIUBarrier, true);
48   }
49   if (FLAG_IS_DEFAULT(ShenandoahSATBBarrier)) {
50     FLAG_SET_DEFAULT(ShenandoahSATBBarrier, false);
51   }
52 
53   SHENANDOAH_ERGO_ENABLE_FLAG(ExplicitGCInvokesConcurrent);
54   SHENANDOAH_ERGO_ENABLE_FLAG(ShenandoahImplicitGCInvokesConcurrent);
55 
56   // Final configuration checks
57   SHENANDOAH_CHECK_FLAG_SET(ShenandoahLoadRefBarrier);
58   SHENANDOAH_CHECK_FLAG_UNSET(ShenandoahSATBBarrier);
59   SHENANDOAH_CHECK_FLAG_SET(ShenandoahIUBarrier);
60   SHENANDOAH_CHECK_FLAG_SET(ShenandoahCASBarrier);
61   SHENANDOAH_CHECK_FLAG_SET(ShenandoahCloneBarrier);
62   SHENANDOAH_CHECK_FLAG_SET(ShenandoahStackWatermarkBarrier);
63 }
64 
65 ShenandoahHeuristics* ShenandoahIUMode::initialize_heuristics() const {
66   if (ShenandoahGCHeuristics == nullptr) {
67     vm_exit_during_initialization("Unknown -XX:ShenandoahGCHeuristics option (null)");
68   }
69   if (strcmp(ShenandoahGCHeuristics, "aggressive") == 0) {
70     return new ShenandoahAggressiveHeuristics();
71   } else if (strcmp(ShenandoahGCHeuristics, "static") == 0) {
72     return new ShenandoahStaticHeuristics();
73   } else if (strcmp(ShenandoahGCHeuristics, "adaptive") == 0) {
74     return new ShenandoahAdaptiveHeuristics();
75   } else if (strcmp(ShenandoahGCHeuristics, "compact") == 0) {
76     return new ShenandoahCompactHeuristics();
77   }
78   vm_exit_during_initialization("Unknown -XX:ShenandoahGCHeuristics option");
79   return nullptr;
80 }