1 /*
2 * Copyright (c) 2017, Red Hat, Inc. and/or its affiliates.
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/gcArguments.hpp"
27 #include "gc/serial/serialArguments.hpp"
28 #include "logging/log.hpp"
29 #include "memory/allocation.inline.hpp"
30 #include "runtime/arguments.hpp"
31 #include "runtime/globals.hpp"
32 #include "runtime/globals_extension.hpp"
33 #include "runtime/java.hpp"
34 #include "runtime/os.hpp"
35 #include "utilities/defaultStream.hpp"
36 #include "utilities/macros.hpp"
37
38 #if INCLUDE_ALL_GCS
39 #include "gc/parallel/parallelArguments.hpp"
40 #include "gc/cms/cmsArguments.hpp"
41 #include "gc/g1/g1Arguments.hpp"
42 #endif
43
44 GCArguments* GCArguments::_instance = NULL;
45
46 GCArguments* GCArguments::arguments() {
47 assert(is_initialized(), "Heap factory not yet created");
48 return _instance;
49 }
50
51 bool GCArguments::is_initialized() {
52 return _instance != NULL;
53 }
54
55 bool GCArguments::gc_selected() {
56 #if INCLUDE_ALL_GCS
57 return UseSerialGC || UseParallelGC || UseParallelOldGC || UseConcMarkSweepGC || UseG1GC;
58 #else
59 return UseSerialGC;
60 #endif // INCLUDE_ALL_GCS
61 }
62
63 void GCArguments::select_gc() {
64 if (!gc_selected()) {
65 select_gc_ergonomically();
66 if (!gc_selected()) {
67 vm_exit_during_initialization("Garbage collector not selected (default collector explicitly disabled)", NULL);
68 }
69 }
70 }
71
72 void GCArguments::select_gc_ergonomically() {
73 #if INCLUDE_ALL_GCS
74 if (os::is_server_class_machine()) {
75 FLAG_SET_ERGO_IF_DEFAULT(bool, UseG1GC, true);
76 } else {
77 FLAG_SET_ERGO_IF_DEFAULT(bool, UseSerialGC, true);
78 }
79 #else
80 UNSUPPORTED_OPTION(UseG1GC);
81 UNSUPPORTED_OPTION(UseParallelGC);
82 UNSUPPORTED_OPTION(UseParallelOldGC);
83 UNSUPPORTED_OPTION(UseConcMarkSweepGC);
84 FLAG_SET_ERGO_IF_DEFAULT(bool, UseSerialGC, true);
85 #endif // INCLUDE_ALL_GCS
86 }
87
88 bool GCArguments::parse_verification_type(const char* type) {
89 log_warning(gc, verify)("VerifyGCType is not supported by this collector.");
90 // Return false to avoid multiple warnings.
91 return false;
92 }
93
94 void GCArguments::initialize_flags() {
95 #if INCLUDE_ALL_GCS
96 if (MinHeapFreeRatio == 100) {
97 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
98 FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99);
99 }
100
101 // If class unloading is disabled, also disable concurrent class unloading.
102 if (!ClassUnloading) {
103 FLAG_SET_CMDLINE(bool, CMSClassUnloadingEnabled, false);
104 FLAG_SET_CMDLINE(bool, ClassUnloadingWithConcurrentMark, false);
105 }
106 #endif // INCLUDE_ALL_GCS
107 }
108
109 void GCArguments::post_heap_initialize() {
110 if (strlen(VerifyGCType) > 0) {
111 const char delimiter[] = " ,\n";
112 size_t length = strlen(VerifyGCType);
113 char* type_list = NEW_C_HEAP_ARRAY(char, length + 1, mtInternal);
114 strncpy(type_list, VerifyGCType, length + 1);
115 char* token = strtok(type_list, delimiter);
116 while (token != NULL) {
117 bool success = parse_verification_type(token);
118 if (!success) {
119 break;
120 }
121 token = strtok(NULL, delimiter);
122 }
123 FREE_C_HEAP_ARRAY(char, type_list);
124 }
125 }
126
127 jint GCArguments::initialize() {
128 assert(!is_initialized(), "GC arguments already initialized");
129
130 select_gc();
131
132 #if !INCLUDE_ALL_GCS
133 if (UseParallelGC || UseParallelOldGC) {
134 jio_fprintf(defaultStream::error_stream(), "UseParallelGC not supported in this VM.\n");
135 return JNI_ERR;
136 } else if (UseG1GC) {
137 jio_fprintf(defaultStream::error_stream(), "UseG1GC not supported in this VM.\n");
138 return JNI_ERR;
139 } else if (UseConcMarkSweepGC) {
140 jio_fprintf(defaultStream::error_stream(), "UseConcMarkSweepGC not supported in this VM.\n");
141 return JNI_ERR;
142 #else
143 if (UseParallelGC || UseParallelOldGC) {
144 _instance = new ParallelArguments();
145 } else if (UseG1GC) {
146 _instance = new G1Arguments();
147 } else if (UseConcMarkSweepGC) {
148 _instance = new CMSArguments();
149 #endif
150 } else if (UseSerialGC) {
151 _instance = new SerialArguments();
152 } else {
153 ShouldNotReachHere();
154 }
155 return JNI_OK;
156 }