1 /*
2 * Copyright (c) 2021, 2023, 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 "precompiled.hpp"
26 #include "cds/archiveBuilder.hpp"
27 #include "cds/cdsConfig.hpp"
28 #include "cds/dumpTimeClassInfo.inline.hpp"
29 #include "cds/runTimeClassInfo.hpp"
30 #include "classfile/classLoader.hpp"
31 #include "classfile/classLoaderData.inline.hpp"
32 #include "classfile/systemDictionaryShared.hpp"
33 #include "memory/resourceArea.hpp"
34
35 DumpTimeClassInfo::~DumpTimeClassInfo() {
36 if (_verifier_constraints != nullptr) {
37 assert(_verifier_constraint_flags != nullptr, "must be");
38 delete _verifier_constraints;
39 delete _verifier_constraint_flags;
40 }
41 if (_loader_constraints != nullptr) {
42 delete _loader_constraints;
43 }
44 }
45
46 bool DumpTimeClassInfo::is_excluded() {
47 if (_excluded) {
48 return true;
49 }
50 if (_failed_verification) {
51 if (CDSConfig::preserve_all_dumptime_verification_states(_klass)) {
52 assert(PreloadSharedClasses, "sanity");
53 // If the verification states are preserved, _klass will be archived in unlinked state. This is
54 // necessary to support the following scenario, where the verification of X requires that
55 // A be a subclass of B:
56 // class X {
57 // B getB() { return new A(); }
58 // }
59 // If X and B can be verified, but A fails verification, we still archive A (in a preloaded
60 // SystemDictionary) so that at runtime we cannot subvert the verification of X by replacing
61 // A with a version that is not a subtype of B.
62 } else {
63 // Don't archive this class. At runtime, load it from classfile and rerun verification.
64 return true;
65 }
66 }
67 return false;
68 }
69
70 size_t DumpTimeClassInfo::runtime_info_bytesize() const {
71 return RunTimeClassInfo::byte_size(_klass, num_verifier_constraints(),
72 num_loader_constraints(),
73 num_enum_klass_static_fields());
74 }
75
76 void DumpTimeClassInfo::add_verification_constraint(InstanceKlass* k, Symbol* name,
77 Symbol* from_name, bool from_field_is_protected, bool from_is_array, bool from_is_object) {
78 if (_verifier_constraints == nullptr) {
79 _verifier_constraints = new (mtClass) GrowableArray<DTVerifierConstraint>(4, mtClass);
80 }
81 if (_verifier_constraint_flags == nullptr) {
82 _verifier_constraint_flags = new (mtClass) GrowableArray<char>(4, mtClass);
83 }
84 GrowableArray<DTVerifierConstraint>* vc_array = _verifier_constraints;
85 for (int i = 0; i < vc_array->length(); i++) {
86 if (vc_array->at(i).equals(name, from_name)) {
87 return;
88 }
89 }
90 DTVerifierConstraint cons(name, from_name);
91 vc_array->append(cons);
92
93 GrowableArray<char>* vcflags_array = _verifier_constraint_flags;
94 char c = 0;
95 c |= from_field_is_protected ? SystemDictionaryShared::FROM_FIELD_IS_PROTECTED : 0;
96 c |= from_is_array ? SystemDictionaryShared::FROM_IS_ARRAY : 0;
97 c |= from_is_object ? SystemDictionaryShared::FROM_IS_OBJECT : 0;
98 vcflags_array->append(c);
99
100 if (log_is_enabled(Trace, cds, verification)) {
101 ResourceMark rm;
102 log_trace(cds, verification)("add_verification_constraint: %s: %s must be subclass of %s [0x%x] array len %d flags len %d",
103 k->external_name(), from_name->as_klass_external_name(),
104 name->as_klass_external_name(), c, vc_array->length(), vcflags_array->length());
105 }
106 }
107
108 static char get_loader_type_by(oop loader) {
109 assert(SystemDictionary::is_builtin_class_loader(loader), "Must be built-in loader");
110 if (SystemDictionary::is_boot_class_loader(loader)) {
111 return (char)ClassLoader::BOOT_LOADER;
112 } else if (SystemDictionary::is_platform_class_loader(loader)) {
113 return (char)ClassLoader::PLATFORM_LOADER;
114 } else {
115 assert(SystemDictionary::is_system_class_loader(loader), "Class loader mismatch");
116 return (char)ClassLoader::APP_LOADER;
117 }
118 }
119
120 void DumpTimeClassInfo::record_linking_constraint(Symbol* name, Handle loader1, Handle loader2) {
121 assert(loader1 != loader2, "sanity");
122 LogTarget(Info, class, loader, constraints) log;
123 if (_loader_constraints == nullptr) {
124 _loader_constraints = new (mtClass) GrowableArray<DTLoaderConstraint>(4, mtClass);
125 }
126 char lt1 = get_loader_type_by(loader1());
127 char lt2 = get_loader_type_by(loader2());
128 DTLoaderConstraint lc(name, lt1, lt2);
129 for (int i = 0; i < _loader_constraints->length(); i++) {
130 if (lc.equals(_loader_constraints->at(i))) {
131 if (log.is_enabled()) {
132 ResourceMark rm;
133 // Use loader[0]/loader[1] to be consistent with the logs in loaderConstraints.cpp
134 log.print("[CDS record loader constraint for class: %s constraint_name: %s loader[0]: %s loader[1]: %s already added]",
135 _klass->external_name(), name->as_C_string(),
136 ClassLoaderData::class_loader_data(loader1())->loader_name_and_id(),
137 ClassLoaderData::class_loader_data(loader2())->loader_name_and_id());
138 }
139 return;
140 }
141 }
142 _loader_constraints->append(lc);
143 if (log.is_enabled()) {
144 ResourceMark rm;
145 // Use loader[0]/loader[1] to be consistent with the logs in loaderConstraints.cpp
146 log.print("[CDS record loader constraint for class: %s constraint_name: %s loader[0]: %s loader[1]: %s total %d]",
147 _klass->external_name(), name->as_C_string(),
148 ClassLoaderData::class_loader_data(loader1())->loader_name_and_id(),
149 ClassLoaderData::class_loader_data(loader2())->loader_name_and_id(),
150 _loader_constraints->length());
151 }
152 }
153
154 void DumpTimeClassInfo::add_enum_klass_static_field(int archived_heap_root_index) {
155 if (_enum_klass_static_fields == nullptr) {
156 _enum_klass_static_fields = new (mtClass) GrowableArray<int>(20, mtClass);
157 }
158 _enum_klass_static_fields->append(archived_heap_root_index);
159 }
160
161 int DumpTimeClassInfo::enum_klass_static_field(int which_field) {
162 assert(_enum_klass_static_fields != nullptr, "must be");
163 return _enum_klass_static_fields->at(which_field);
164 }
165
166 bool DumpTimeClassInfo::is_builtin() {
167 return SystemDictionaryShared::is_builtin(_klass);
168 }
169
170 DumpTimeClassInfo* DumpTimeSharedClassTable::allocate_info(InstanceKlass* k) {
171 if (!CDSConfig::is_dumping_final_static_archive()) {
172 assert(!k->is_shared(), "Do not call with shared classes");
173 }
174 bool created;
175 DumpTimeClassInfo* p = put_if_absent(k, &created);
176 assert(created, "must not exist in table");
177 p->_klass = k;
178 //ResourceMark rm;
179 //tty->print_cr("allocate_info %p %s", k, k->external_name());
180 return p;
181 }
182
183 DumpTimeClassInfo* DumpTimeSharedClassTable::get_info(InstanceKlass* k) {
184 if (!CDSConfig::is_dumping_final_static_archive()) {
185 assert(!k->is_shared(), "Do not call with shared classes");
186 }
187 DumpTimeClassInfo* p = get(k);
188 assert(p != nullptr, "we must not see any non-shared InstanceKlass* that's "
189 "not stored with SystemDictionaryShared::init_dumptime_info");
190 assert(p->_klass == k, "Sanity");
191 return p;
192 }
193
194 class CountClassByCategory : StackObj {
195 DumpTimeSharedClassTable* _table;
196 public:
197 CountClassByCategory(DumpTimeSharedClassTable* table) : _table(table) {}
198 void do_entry(InstanceKlass* k, DumpTimeClassInfo& info) {
199 if (!info.is_excluded()) {
200 if (info.is_builtin()) {
201 _table->inc_builtin_count();
202 } else {
203 _table->inc_unregistered_count();
204 }
205 }
206 }
207 };
208
209 void DumpTimeSharedClassTable::update_counts() {
210 _builtin_count = 0;
211 _unregistered_count = 0;
212 CountClassByCategory counter(this);
213 iterate_all_live_classes(&counter);
214 }