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 }