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.
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 "cds/archiveBuilder.hpp"
26 #include "cds/regeneratedClasses.hpp"
27 #include "classfile/vmSymbols.hpp"
28 #include "memory/universe.hpp"
29 #include "oops/instanceKlass.hpp"
30 #include "oops/method.hpp"
31 #include "oops/oopHandle.inline.hpp"
32 #include "runtime/mutexLocker.hpp"
33 #include "runtime/thread.hpp"
34 #include "utilities/growableArray.hpp"
35 #include "utilities/hashTable.hpp"
36
37 using RegeneratedObjTable = HashTable<address, address, 15889, AnyObj::C_HEAP, mtClassShared>;
38 static RegeneratedObjTable* _regenerated_objs = nullptr; // InstanceKlass* and Method* orig_obj -> regen_obj
39 static RegeneratedObjTable* _original_objs = nullptr; // InstanceKlass* and Method* regen_obj -> orig_obj
40 static GrowableArrayCHeap<OopHandle, mtClassShared>* _regenerated_mirrors = nullptr;
41
42 // The regenerated Klass is not added to any class loader, so we need
43 // to keep its java_mirror alive to avoid class unloading.
44 void RegeneratedClasses::add_class(InstanceKlass* orig_klass, InstanceKlass* regen_klass) {
45 MutexLocker ml(DumpTimeTable_lock, Mutex::_no_safepoint_check_flag);
46 if (_regenerated_mirrors == nullptr) {
47 _regenerated_mirrors = new GrowableArrayCHeap<OopHandle, mtClassShared>(150);
48 }
49 _regenerated_mirrors->append(OopHandle(Universe::vm_global(), regen_klass->java_mirror()));
50
51 if (_regenerated_objs == nullptr) {
52 _regenerated_objs = new (mtClass)RegeneratedObjTable();
53 }
54 if (_original_objs == nullptr) {
55 _original_objs = new (mtClass)RegeneratedObjTable();
56 }
57
58 _regenerated_objs->put((address)orig_klass, (address)regen_klass);
59 _original_objs->put((address)regen_klass, (address)orig_klass);
60 Array<Method*>* methods = orig_klass->methods();
61 for (int i = 0; i < methods->length(); i++) {
62 Method* orig_m = methods->at(i);
63 Method* regen_m = regen_klass->find_method(orig_m->name(), orig_m->signature());
64 if (regen_m == nullptr) {
65 ResourceMark rm;
66 if (orig_m->name() != vmSymbols::object_initializer_name()) {
67 // JLI Holder classes are never instantiated, they don't need to have constructors.
68 // Not printing the warning if the method is a constructor.
69 log_warning(aot)("Method in original class is missing from regenerated class: " INTPTR_FORMAT " %s",
70 p2i(orig_m), orig_m->external_name());
71 }
72 } else {
73 _regenerated_objs->put((address)orig_m, (address)regen_m);
74 _original_objs->put((address)regen_m, (address)orig_m);
75 }
76 }
77
78 if (log_is_enabled(Info, cds)) {
79 ResourceMark rm;
80 log_info(cds)("Regenerated class %s: methods %d -> %d)", orig_klass->external_name(),
81 orig_klass->methods()->length(), regen_klass->methods()->length());
82 }
83 }
84
85 bool RegeneratedClasses::has_been_regenerated(address orig_obj) {
86 if (_regenerated_objs == nullptr) {
87 return false;
88 } else {
89 return _regenerated_objs->get(orig_obj) != nullptr;
90 }
91 }
92
93 address RegeneratedClasses::get_regenerated_object(address orig_obj) {
94 assert(_regenerated_objs != nullptr, "must be");
95 address* p =_regenerated_objs->get(orig_obj);
96 assert(p != nullptr, "must be");
97 return *p;
98 }
99
100 bool RegeneratedClasses::is_regenerated_object(address regen_obj) {
101 if (_original_objs == nullptr) {
102 return false;
103 } else {
104 return _original_objs->get(regen_obj) != nullptr;
105 }
106 }
107
108 address RegeneratedClasses::get_original_object(address regen_obj) {
109 assert(_original_objs != nullptr, "must be");
110 address* p =_original_objs->get(regen_obj);
111 assert(p != nullptr, "must be");
112 return *p;
113 }
114
115 void RegeneratedClasses::record_regenerated_objects() {
116 assert_locked_or_safepoint(DumpTimeTable_lock);
117 if (_regenerated_objs != nullptr) {
118 auto doit = [&] (address orig_obj, address regen_obj) {
119 ArchiveBuilder::current()->record_regenerated_object(orig_obj, regen_obj);
120 };
121 _regenerated_objs->iterate_all(doit);
122 }
123 }
124
125 void RegeneratedClasses::cleanup() {
126 MutexLocker ml(DumpTimeTable_lock, Mutex::_no_safepoint_check_flag);
127 if (_regenerated_mirrors != nullptr) {
128 for (int i = 0; i < _regenerated_mirrors->length(); i++) {
129 _regenerated_mirrors->at(i).release(Universe::vm_global());
130 }
131 delete _regenerated_mirrors;
132 _regenerated_mirrors = nullptr;
133 }
134 if (_regenerated_objs != nullptr) {
135 delete _regenerated_objs;
136 }
137 }