1 /*
2 * Copyright (c) 2023, 2025, 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.
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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
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23 */
24
25 #ifndef SHARE_CDS_CDSCONFIG_HPP
26 #define SHARE_CDS_CDSCONFIG_HPP
27
28 #include "memory/allStatic.hpp"
29 #include "runtime/arguments.hpp"
30 #include "utilities/globalDefinitions.hpp"
31 #include "utilities/macros.hpp"
32
33 class JavaThread;
34
35 class CDSConfig : public AllStatic {
36 #if INCLUDE_CDS
37 static bool _is_dumping_static_archive;
38 static bool _is_dumping_preimage_static_archive;
39 static bool _is_dumping_final_static_archive;
40 static bool _is_dumping_dynamic_archive;
41 static bool _is_using_optimized_module_handling;
42 static bool _is_dumping_full_module_graph;
43 static bool _is_using_full_module_graph;
44 static bool _has_aot_linked_classes;
45
46 static bool _module_patching_disables_cds;
47 static bool _java_base_module_patching_disables_cds;
48
49 const static char* _default_archive_path;
50 const static char* _input_static_archive_path;
51 const static char* _input_dynamic_archive_path;
52 const static char* _output_archive_path;
53
54 static bool _old_cds_flags_used;
55 static bool _new_aot_flags_used;
56 static bool _disable_heap_dumping;
57
58 static JavaThread* _dumper_thread;
59 #endif
60
61 static void extract_archive_paths(const char* archive_path,
62 const char** base_archive_path,
63 const char** top_archive_path);
64 static int num_archive_paths(const char* path_spec);
65 static void check_flag_single_path(const char* flag_name, const char* value);
66
67 // Checks before Arguments::apply_ergo()
68 static void check_new_flag(bool new_flag_is_default, const char* new_flag_name);
69 static void check_aot_flags();
70 static void check_aotmode_off();
71 static void check_aotmode_auto_or_on();
72 static void check_aotmode_record();
73 static void check_aotmode_create();
74 static void check_unsupported_dumping_module_options();
75
76 // Called after Arguments::apply_ergo() has started
77 static void ergo_init_classic_archive_paths();
78 static void ergo_init_aot_paths();
79
80 public:
81 // Used by jdk.internal.misc.CDS.getCDSConfigStatus();
82 static const int IS_DUMPING_ARCHIVE = 1 << 0;
83 static const int IS_DUMPING_METHOD_HANDLES = 1 << 1;
84 static const int IS_DUMPING_STATIC_ARCHIVE = 1 << 2;
85 static const int IS_LOGGING_LAMBDA_FORM_INVOKERS = 1 << 3;
86 static const int IS_USING_ARCHIVE = 1 << 4;
87
88 static int get_status() NOT_CDS_RETURN_(0);
89
90 // Initialization and command-line checking
91 static void ergo_initialize() NOT_CDS_RETURN;
92 static void set_old_cds_flags_used() { CDS_ONLY(_old_cds_flags_used = true); }
93 static bool old_cds_flags_used() { return CDS_ONLY(_old_cds_flags_used) NOT_CDS(false); }
94 static bool new_aot_flags_used() { return CDS_ONLY(_new_aot_flags_used) NOT_CDS(false); }
95 static void check_internal_module_property(const char* key, const char* value) NOT_CDS_RETURN;
96 static void check_incompatible_property(const char* key, const char* value) NOT_CDS_RETURN;
97 static bool has_unsupported_runtime_module_options() NOT_CDS_RETURN_(false);
98 static bool check_vm_args_consistency(bool mode_flag_cmd_line) NOT_CDS_RETURN_(true);
99
100 static bool module_patching_disables_cds() { return CDS_ONLY(_module_patching_disables_cds) NOT_CDS(false); }
101 static void set_module_patching_disables_cds() { CDS_ONLY(_module_patching_disables_cds = true;) }
102 static bool java_base_module_patching_disables_cds() { return CDS_ONLY(_java_base_module_patching_disables_cds) NOT_CDS(false); }
103 static void set_java_base_module_patching_disables_cds() { CDS_ONLY(_java_base_module_patching_disables_cds = true;) }
104 static const char* type_of_archive_being_loaded();
105 static const char* type_of_archive_being_written();
106 static void prepare_for_dumping();
107
108 // --- Basic CDS features
109
110 // archive(s) in general
111 static bool is_dumping_archive() { return is_dumping_static_archive() || is_dumping_dynamic_archive(); }
112
113 // input archive(s)
114 static bool is_using_archive() NOT_CDS_RETURN_(false);
115
116 // static_archive
117 static bool is_dumping_static_archive() { return CDS_ONLY(_is_dumping_static_archive) NOT_CDS(false); }
118 static void enable_dumping_static_archive() { CDS_ONLY(_is_dumping_static_archive = true); }
119
120 // A static CDS archive can be dumped in three modes:
121 //
122 // "classic" - This is the traditional CDS workflow of
123 // "java -Xshare:dump -XX:SharedClassListFile=file.txt".
124 //
125 // "preimage" - This happens when we execute the JEP 483 training run, e.g:
126 // "java -XX:AOTMode=record -XX:AOTConfiguration=app.aotconfig -cp app.jar App"
127 // The above command writes app.aotconfig as a "CDS preimage". This
128 // is a binary file that contains all the classes loaded during the
129 // training run, plus profiling data (e.g., the resolved constant pool entries).
130 //
131 // "final" - This happens when we execute the JEP 483 assembly phase, e.g:
132 // "java -XX:AOTMode=create -XX:AOTConfiguration=app.aotconfig -XX:AOTCache=app.aot -cp app.jar"
133 // The above command loads all classes from app.aotconfig, perform additional linking,
134 // and writes app.aot as a "CDS final image" file.
135 //
136 // The main structural difference between "preimage" and "final" is that the preimage
137 // - has a different magic number (0xcafea07c)
138 // - does not have any archived Java heap objects
139 // - does not have aot-linked classes
140 static bool is_dumping_classic_static_archive() NOT_CDS_RETURN_(false);
141 static bool is_dumping_preimage_static_archive() NOT_CDS_RETURN_(false);
142 static bool is_dumping_final_static_archive() NOT_CDS_RETURN_(false);
143
144 // dynamic_archive
145 static bool is_dumping_dynamic_archive() { return CDS_ONLY(_is_dumping_dynamic_archive) NOT_CDS(false); }
146 static void enable_dumping_dynamic_archive(const char* output_path) NOT_CDS_RETURN;
147 static void disable_dumping_dynamic_archive() { CDS_ONLY(_is_dumping_dynamic_archive = false); }
148
149 // Misc CDS features
150 static bool allow_only_single_java_thread() NOT_CDS_RETURN_(false);
151
152 // This is *Legacy* optimization for lambdas before JEP 483. May be removed in the future.
153 static bool is_dumping_lambdas_in_legacy_mode() NOT_CDS_RETURN_(false);
154
155 // optimized_module_handling -- can we skip some expensive operations related to modules?
156 static bool is_using_optimized_module_handling() { return CDS_ONLY(_is_using_optimized_module_handling) NOT_CDS(false); }
157 static void stop_using_optimized_module_handling() NOT_CDS_RETURN;
158
159 static bool is_logging_lambda_form_invokers() NOT_CDS_RETURN_(false);
160 static bool is_dumping_regenerated_lambdaform_invokers() NOT_CDS_RETURN_(false);
161
162 static bool is_dumping_aot_linked_classes() NOT_CDS_JAVA_HEAP_RETURN_(false);
163 static bool is_using_aot_linked_classes() NOT_CDS_JAVA_HEAP_RETURN_(false);
164 static void set_has_aot_linked_classes(bool has_aot_linked_classes) NOT_CDS_JAVA_HEAP_RETURN;
165
166 // archive_path
167
168 // Points to the classes.jsa in $JAVA_HOME (could be input or output)
169 static const char* default_archive_path() NOT_CDS_RETURN_(nullptr);
170 static const char* input_static_archive_path() { return CDS_ONLY(_input_static_archive_path) NOT_CDS(nullptr); }
171 static const char* input_dynamic_archive_path() { return CDS_ONLY(_input_dynamic_archive_path) NOT_CDS(nullptr); }
172 static const char* output_archive_path() { return CDS_ONLY(_output_archive_path) NOT_CDS(nullptr); }
173
174 // --- Archived java objects
175
176 static bool are_vm_options_incompatible_with_dumping_heap() NOT_CDS_JAVA_HEAP_RETURN_(true);
177 static void log_reasons_for_not_dumping_heap();
178
179 static void disable_heap_dumping() { CDS_ONLY(_disable_heap_dumping = true); }
180 static bool is_dumping_heap() NOT_CDS_JAVA_HEAP_RETURN_(false);
181 static bool is_loading_heap() NOT_CDS_JAVA_HEAP_RETURN_(false);
182 static bool is_initing_classes_at_dump_time() NOT_CDS_JAVA_HEAP_RETURN_(false);
183
184 static bool is_dumping_invokedynamic() NOT_CDS_JAVA_HEAP_RETURN_(false);
185 static bool is_dumping_method_handles() NOT_CDS_JAVA_HEAP_RETURN_(false);
186
187 // full_module_graph (requires optimized_module_handling)
188 static bool is_dumping_full_module_graph() { return CDS_ONLY(_is_dumping_full_module_graph) NOT_CDS(false); }
189 static bool is_using_full_module_graph() NOT_CDS_JAVA_HEAP_RETURN_(false);
190 static void stop_dumping_full_module_graph(const char* reason = nullptr) NOT_CDS_JAVA_HEAP_RETURN;
191 static void stop_using_full_module_graph(const char* reason = nullptr) NOT_CDS_JAVA_HEAP_RETURN;
192
193 static bool is_valhalla_preview() {
194 return Arguments::enable_preview() && EnableValhalla;
195 }
196
197 // Some CDS functions assume that they are called only within a single-threaded context. I.e.,
198 // they are called from:
199 // - The VM thread (e.g., inside VM_PopulateDumpSharedSpace)
200 // - The thread that performs prepatory steps before switching to the VM thread
201 // Since these two threads never execute concurrently, we can avoid using locks in these CDS
202 // function. For safety, these functions should assert with CDSConfig::current_thread_is_vm_or_dumper().
203 class DumperThreadMark {
204 public:
205 DumperThreadMark(JavaThread* current);
206 ~DumperThreadMark();
207 };
208
209 static bool current_thread_is_vm_or_dumper() NOT_CDS_RETURN_(false);
210 };
211
212 #endif // SHARE_CDS_CDSCONFIG_HPP