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 "memory/universe.hpp"
28 #include "oops/instanceKlass.hpp"
29 #include "oops/method.hpp"
30 #include "oops/oopHandle.inline.hpp"
31 #include "runtime/mutexLocker.hpp"
32 #include "runtime/thread.hpp"
33 #include "utilities/growableArray.hpp"
34 #include "utilities/resourceHash.hpp"
35
36 using RegeneratedObjTable = ResourceHashtable<address, address, 15889, AnyObj::C_HEAP, mtClassShared>;
37 static RegeneratedObjTable* _renegerated_objs = nullptr; // InstanceKlass* and Method*
38 static GrowableArrayCHeap<OopHandle, mtClassShared>* _regenerated_mirrors = nullptr;
39
40 // The regenerated Klass is not added to any class loader, so we need
41 // to keep its java_mirror alive to avoid class unloading.
42 void RegeneratedClasses::add_class(InstanceKlass* orig_klass, InstanceKlass* regen_klass) {
43 MutexLocker ml(DumpTimeTable_lock, Mutex::_no_safepoint_check_flag);
44 if (_regenerated_mirrors == nullptr) {
45 _regenerated_mirrors = new GrowableArrayCHeap<OopHandle, mtClassShared>(150);
46 }
47 _regenerated_mirrors->append(OopHandle(Universe::vm_global(), regen_klass->java_mirror()));
48
49 if (_renegerated_objs == nullptr) {
50 _renegerated_objs = new (mtClass)RegeneratedObjTable();
51 }
52
53 _renegerated_objs->put((address)orig_klass, (address)regen_klass);
54 Array<Method*>* methods = orig_klass->methods();
55 for (int i = 0; i < methods->length(); i++) {
56 Method* orig_m = methods->at(i);
57 Method* regen_m = regen_klass->find_method(orig_m->name(), orig_m->signature());
58 if (regen_m == nullptr) {
59 ResourceMark rm;
60 log_warning(cds)("Method in original class is missing from regenerated class: " INTPTR_FORMAT " %s",
61 p2i(orig_m), orig_m->external_name());
62 } else {
63 _renegerated_objs->put((address)orig_m, (address)regen_m);
64 }
65 }
66
67 if (log_is_enabled(Info, cds)) {
68 ResourceMark rm;
69 log_info(cds)("Regenerated class %s: methods %d -> %d)", orig_klass->external_name(),
70 orig_klass->methods()->length(), regen_klass->methods()->length());
71 }
72 }
73
74 bool RegeneratedClasses::has_been_regenerated(address orig_obj) {
75 if (_renegerated_objs == nullptr) {
76 return false;
77 } else {
78 return _renegerated_objs->get(orig_obj) != nullptr;
79 }
80 }
81
82 address RegeneratedClasses::get_regenerated_object(address orig_obj) {
83 assert(_renegerated_objs != nullptr, "must be");
84 address* p =_renegerated_objs->get(orig_obj);
85 assert(p != nullptr, "must be");
86 return *p;
87 }
88
89 void RegeneratedClasses::record_regenerated_objects() {
90 assert_locked_or_safepoint(DumpTimeTable_lock);
91 if (_renegerated_objs != nullptr) {
92 auto doit = [&] (address orig_obj, address regen_obj) {
93 ArchiveBuilder::current()->record_regenerated_object(orig_obj, regen_obj);
94 };
95 _renegerated_objs->iterate_all(doit);
96 }
97 }
98
99 void RegeneratedClasses::cleanup() {
100 MutexLocker ml(DumpTimeTable_lock, Mutex::_no_safepoint_check_flag);
101 if (_regenerated_mirrors != nullptr) {
102 for (int i = 0; i < _regenerated_mirrors->length(); i++) {
103 _regenerated_mirrors->at(i).release(Universe::vm_global());
104 }
105 delete _regenerated_mirrors;
106 _regenerated_mirrors = nullptr;
107 }
108 if (_renegerated_objs != nullptr) {
109 delete _renegerated_objs;
110 }
111 }