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/aotClassLinker.hpp"
26 #include "cds/aotConstantPoolResolver.hpp"
27 #include "cds/archiveBuilder.hpp"
28 #include "cds/cdsConfig.hpp"
29 #include "classfile/systemDictionary.hpp"
30 #include "classfile/systemDictionaryShared.hpp"
31 #include "classfile/vmClasses.hpp"
32 #include "interpreter/bytecodeStream.hpp"
33 #include "interpreter/interpreterRuntime.hpp"
34 #include "memory/resourceArea.hpp"
35 #include "oops/constantPool.inline.hpp"
36 #include "oops/instanceKlass.hpp"
37 #include "oops/klass.inline.hpp"
38 #include "runtime/handles.inline.hpp"
39
40 // Returns true if we CAN PROVE that cp_index will always resolve to
41 // the same information at both dump time and run time. This is a
42 // necessary (but not sufficient) condition for pre-resolving cp_index
43 // during CDS archive assembly.
44 bool AOTConstantPoolResolver::is_resolution_deterministic(ConstantPool* cp, int cp_index) {
45 assert(!is_in_archivebuilder_buffer(cp), "sanity");
46
47 if (cp->tag_at(cp_index).is_klass()) {
48 // We require cp_index to be already resolved. This is fine for now, are we
49 // currently archive only CP entries that are already resolved.
50 Klass* resolved_klass = cp->resolved_klass_at(cp_index);
51 return resolved_klass != nullptr && is_class_resolution_deterministic(cp->pool_holder(), resolved_klass);
52 } else if (cp->tag_at(cp_index).is_invoke_dynamic()) {
53 return is_indy_resolution_deterministic(cp, cp_index);
54 } else if (cp->tag_at(cp_index).is_field() ||
55 cp->tag_at(cp_index).is_method() ||
56 cp->tag_at(cp_index).is_interface_method()) {
57 int klass_cp_index = cp->uncached_klass_ref_index_at(cp_index);
58 if (!cp->tag_at(klass_cp_index).is_klass()) {
132 } else if (resolved_class->is_typeArray_klass()) {
133 return true;
134 } else {
135 return false;
136 }
137 }
138
139 void AOTConstantPoolResolver::preresolve_string_cp_entries(InstanceKlass* ik, TRAPS) {
140 if (!ik->is_linked()) {
141 // The cp->resolved_referenced() array is not ready yet, so we can't call resolve_string().
142 return;
143 }
144 constantPoolHandle cp(THREAD, ik->constants());
145 for (int cp_index = 1; cp_index < cp->length(); cp_index++) { // Index 0 is unused
146 switch (cp->tag_at(cp_index).value()) {
147 case JVM_CONSTANT_String:
148 resolve_string(cp, cp_index, CHECK); // may throw OOM when interning strings.
149 break;
150 }
151 }
152 }
153
154 // This works only for the boot/platform/app loaders
155 Klass* AOTConstantPoolResolver::find_loaded_class(Thread* current, oop class_loader, Symbol* name) {
156 HandleMark hm(current);
157 Handle h_loader(current, class_loader);
158 Klass* k = SystemDictionary::find_instance_or_array_klass(current, name, h_loader);
159 if (k != nullptr) {
160 return k;
161 }
162 if (h_loader() == SystemDictionary::java_system_loader()) {
163 return find_loaded_class(current, SystemDictionary::java_platform_loader(), name);
164 } else if (h_loader() == SystemDictionary::java_platform_loader()) {
165 return find_loaded_class(current, nullptr, name);
166 } else {
167 assert(h_loader() == nullptr, "This function only works for boot/platform/app loaders %p %p %p",
168 cast_from_oop<address>(h_loader()),
169 cast_from_oop<address>(SystemDictionary::java_system_loader()),
170 cast_from_oop<address>(SystemDictionary::java_platform_loader()));
171 }
642
643 // dynamicMethodType
644 if (!check_lambda_metafactory_methodtype_arg(cp, bsms_attribute_index, 2)) {
645 return false;
646 }
647
648 return true;
649 }
650
651 return false;
652 }
653 #ifdef ASSERT
654 bool AOTConstantPoolResolver::is_in_archivebuilder_buffer(address p) {
655 if (!Thread::current()->is_VM_thread() || ArchiveBuilder::current() == nullptr) {
656 return false;
657 } else {
658 return ArchiveBuilder::current()->is_in_buffer_space(p);
659 }
660 }
661 #endif
|
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/aotClassLinker.hpp"
26 #include "cds/aotClassLocation.hpp"
27 #include "cds/aotConstantPoolResolver.hpp"
28 #include "cds/aotLogging.hpp"
29 #include "cds/archiveBuilder.hpp"
30 #include "cds/archiveUtils.inline.hpp"
31 #include "cds/cdsConfig.hpp"
32 #include "cds/finalImageRecipes.hpp"
33 #include "cds/heapShared.hpp"
34 #include "cds/lambdaFormInvokers.inline.hpp"
35 #include "classfile/classLoader.hpp"
36 #include "classfile/dictionary.hpp"
37 #include "classfile/symbolTable.hpp"
38 #include "classfile/systemDictionary.hpp"
39 #include "classfile/systemDictionaryShared.hpp"
40 #include "classfile/vmClasses.hpp"
41 #include "interpreter/bytecodeStream.hpp"
42 #include "interpreter/interpreterRuntime.hpp"
43 #include "memory/resourceArea.hpp"
44 #include "oops/constantPool.inline.hpp"
45 #include "oops/fieldStreams.inline.hpp"
46 #include "oops/instanceKlass.hpp"
47 #include "oops/klass.inline.hpp"
48 #include "runtime/handles.inline.hpp"
49 #include "runtime/javaCalls.hpp"
50 #include "runtime/signature.hpp"
51
52 // Returns true if we CAN PROVE that cp_index will always resolve to
53 // the same information at both dump time and run time. This is a
54 // necessary (but not sufficient) condition for pre-resolving cp_index
55 // during CDS archive assembly.
56 bool AOTConstantPoolResolver::is_resolution_deterministic(ConstantPool* cp, int cp_index) {
57 assert(!is_in_archivebuilder_buffer(cp), "sanity");
58
59 if (cp->tag_at(cp_index).is_klass()) {
60 // We require cp_index to be already resolved. This is fine for now, are we
61 // currently archive only CP entries that are already resolved.
62 Klass* resolved_klass = cp->resolved_klass_at(cp_index);
63 return resolved_klass != nullptr && is_class_resolution_deterministic(cp->pool_holder(), resolved_klass);
64 } else if (cp->tag_at(cp_index).is_invoke_dynamic()) {
65 return is_indy_resolution_deterministic(cp, cp_index);
66 } else if (cp->tag_at(cp_index).is_field() ||
67 cp->tag_at(cp_index).is_method() ||
68 cp->tag_at(cp_index).is_interface_method()) {
69 int klass_cp_index = cp->uncached_klass_ref_index_at(cp_index);
70 if (!cp->tag_at(klass_cp_index).is_klass()) {
144 } else if (resolved_class->is_typeArray_klass()) {
145 return true;
146 } else {
147 return false;
148 }
149 }
150
151 void AOTConstantPoolResolver::preresolve_string_cp_entries(InstanceKlass* ik, TRAPS) {
152 if (!ik->is_linked()) {
153 // The cp->resolved_referenced() array is not ready yet, so we can't call resolve_string().
154 return;
155 }
156 constantPoolHandle cp(THREAD, ik->constants());
157 for (int cp_index = 1; cp_index < cp->length(); cp_index++) { // Index 0 is unused
158 switch (cp->tag_at(cp_index).value()) {
159 case JVM_CONSTANT_String:
160 resolve_string(cp, cp_index, CHECK); // may throw OOM when interning strings.
161 break;
162 }
163 }
164
165 // Normally, we don't want to archive any CP entries that were not resolved
166 // in the training run. Otherwise the AOT/JIT may inline too much code that has not
167 // been executed.
168 //
169 // However, we want to aggressively resolve all klass/field/method constants for
170 // LambdaForm Invoker Holder classes, Lambda Proxy classes, and LambdaForm classes,
171 // so that the compiler can inline through them.
172 if (SystemDictionaryShared::is_builtin_loader(ik->class_loader_data())) {
173 bool eager_resolve = false;
174
175 if (LambdaFormInvokers::may_be_regenerated_class(ik->name())) {
176 eager_resolve = true;
177 }
178 if (ik->is_hidden() && HeapShared::is_archivable_hidden_klass(ik)) {
179 eager_resolve = true;
180 }
181
182 if (eager_resolve) {
183 preresolve_class_cp_entries(THREAD, ik, nullptr);
184 preresolve_field_and_method_cp_entries(THREAD, ik, nullptr);
185 }
186 }
187 }
188
189 // This works only for the boot/platform/app loaders
190 Klass* AOTConstantPoolResolver::find_loaded_class(Thread* current, oop class_loader, Symbol* name) {
191 HandleMark hm(current);
192 Handle h_loader(current, class_loader);
193 Klass* k = SystemDictionary::find_instance_or_array_klass(current, name, h_loader);
194 if (k != nullptr) {
195 return k;
196 }
197 if (h_loader() == SystemDictionary::java_system_loader()) {
198 return find_loaded_class(current, SystemDictionary::java_platform_loader(), name);
199 } else if (h_loader() == SystemDictionary::java_platform_loader()) {
200 return find_loaded_class(current, nullptr, name);
201 } else {
202 assert(h_loader() == nullptr, "This function only works for boot/platform/app loaders %p %p %p",
203 cast_from_oop<address>(h_loader()),
204 cast_from_oop<address>(SystemDictionary::java_system_loader()),
205 cast_from_oop<address>(SystemDictionary::java_platform_loader()));
206 }
677
678 // dynamicMethodType
679 if (!check_lambda_metafactory_methodtype_arg(cp, bsms_attribute_index, 2)) {
680 return false;
681 }
682
683 return true;
684 }
685
686 return false;
687 }
688 #ifdef ASSERT
689 bool AOTConstantPoolResolver::is_in_archivebuilder_buffer(address p) {
690 if (!Thread::current()->is_VM_thread() || ArchiveBuilder::current() == nullptr) {
691 return false;
692 } else {
693 return ArchiveBuilder::current()->is_in_buffer_space(p);
694 }
695 }
696 #endif
697
698 // Paranoid check -- if any field/method signature in <ik> is referencing a class that is known to be
699 // excluded, do not archive any reflection data in <ik>.
700 bool AOTConstantPoolResolver::check_signature_for_reflection_data(InstanceKlass* ik, Symbol* sig, bool is_method) {
701 precond(SafepointSynchronize::is_at_safepoint());
702 ResourceMark rm;
703 for (SignatureStream ss(sig, is_method); !ss.is_done(); ss.next()) {
704 if (ss.is_reference()) {
705 Symbol* klass_name = ss.as_symbol(/*probe_only=*/true);
706 if (klass_name == nullptr) {
707 // This symbol has never been created during the assembly phase, so it can't
708 // possibly be referencing an excluded class.
709 continue;
710 }
711 if (Signature::is_array(klass_name)) {
712 SignatureStream ss2(klass_name, false);
713 ss2.skip_array_prefix();
714 if (ss2.is_reference() && ss2.as_symbol(/*probe_only=*/true) == nullptr) {
715 // klass_name is an array klass that has not been loaded during the assembly phase, so it can't
716 // possibly be referencing an excluded class.
717 continue;
718 }
719 }
720 Klass* k = find_loaded_class(Thread::current(), ik->class_loader(), klass_name);
721 if (k == nullptr) {
722 // No class of this name has been loaded for this loader, so this name can't
723 // possibly be referencing an excluded class.
724 continue;
725 }
726 if (SystemDictionaryShared::should_be_excluded(k)) {
727 if (log_is_enabled(Warning, aot, resolve)) {
728 ResourceMark rm;
729 log_warning(aot, resolve)("Cannot archive reflection data in %s because it refers to excluded class %s",
730 ik->external_name(), k->external_name());
731 }
732 return false;
733 }
734 }
735 }
736 return true;
737 }
738
739 bool AOTConstantPoolResolver::can_archive_reflection_data_declared_fields(InstanceKlass* ik) {
740 for (JavaFieldStream fs(ik); !fs.done(); fs.next()) {
741 if (!check_signature_for_reflection_data(ik, fs.signature(), /*is_method=*/false)) {
742 return false;
743 }
744 }
745
746 return true;
747 }
748
749 bool AOTConstantPoolResolver::can_archive_reflection_data_declared_methods(InstanceKlass* ik) {
750 Array<Method*>* methods = ik->methods();
751 for (int i = 0; i < methods->length(); i++) {
752 Method* m = methods->at(i);
753 if (!check_signature_for_reflection_data(ik, m->signature(), /*is_method=*/true)) {
754 return false;
755 }
756 }
757
758 return true;
759 }
760
761 // This is called by AOT assembly phase to see if java_lang_Class::reflection_data(k) can be
762 // archived.
763 bool AOTConstantPoolResolver::can_archive_reflection_data(InstanceKlass* ik) {
764 // At this point, we have resolved the reflection data of *all* classes
765 // recorded by FinalImageRecipes.
766 // When we are in the AOT safepoint, we will archive the reflection
767 // data of <ik> *only if* it doesn't reference any excluded classes.
768 precond(SafepointSynchronize::is_at_safepoint());
769
770 if (!can_archive_reflection_data_declared_fields(ik)) {
771 return false;
772 }
773 if (!can_archive_reflection_data_declared_methods(ik)) {
774 return false;
775 }
776
777 if (log_is_enabled(Info, aot, resolve)) {
778 ResourceMark rm;
779 log_info(aot, resolve)("Archived reflection data in %s", ik->external_name());
780 }
781
782 return true;
783 }
784
785 int AOTConstantPoolResolver::class_reflection_data_flags(InstanceKlass* ik, TRAPS) {
786 assert(java_lang_Class::has_reflection_data(ik->java_mirror()), "must be");
787
788 HandleMark hm(THREAD);
789 JavaCallArguments args(Handle(THREAD, ik->java_mirror()));
790 JavaValue result(T_INT);
791 JavaCalls::call_special(&result,
792 vmClasses::Class_klass(),
793 vmSymbols::encodeReflectionData_name(),
794 vmSymbols::void_int_signature(),
795 &args, CHECK_0);
796 int flags = result.get_jint();
797 aot_log_info(aot)("Encode ReflectionData: %s (flags=0x%x)", ik->external_name(), flags);
798 return flags;
799 }
800
801 void AOTConstantPoolResolver::generate_reflection_data(JavaThread* current, InstanceKlass* ik, int rd_flags) {
802 aot_log_info(aot)("Generate ReflectionData: %s (flags=" INT32_FORMAT_X ")", ik->external_name(), rd_flags);
803 JavaThread* THREAD = current; // for exception macros
804 JavaCallArguments args(Handle(THREAD, ik->java_mirror()));
805 args.push_int(rd_flags);
806 JavaValue result(T_OBJECT);
807 JavaCalls::call_special(&result,
808 vmClasses::Class_klass(),
809 vmSymbols::generateReflectionData_name(),
810 vmSymbols::int_void_signature(),
811 &args, THREAD);
812 if (HAS_PENDING_EXCEPTION) {
813 Handle exc_handle(THREAD, PENDING_EXCEPTION);
814 CLEAR_PENDING_EXCEPTION;
815
816 log_warning(aot)("Exception during Class::generateReflectionData() call for %s", ik->external_name());
817 LogStreamHandle(Debug, aot) log;
818 if (log.is_enabled()) {
819 java_lang_Throwable::print_stack_trace(exc_handle, &log);
820 }
821 }
822 }
823
824 Klass* AOTConstantPoolResolver::resolve_boot_class_or_fail(const char* class_name, TRAPS) {
825 Handle class_loader;
826 TempNewSymbol class_name_sym = SymbolTable::new_symbol(class_name);
827 return SystemDictionary::resolve_or_fail(class_name_sym, class_loader, true, THREAD);
828 }
829
830 void AOTConstantPoolResolver::trace_dynamic_proxy_class(oop loader, const char* proxy_name, objArrayOop interfaces, int access_flags) {
831 if (interfaces->length() < 1) {
832 return;
833 }
834 if (CDSConfig::is_dumping_preimage_static_archive()) {
835 FinalImageRecipes::add_dynamic_proxy_class(loader, proxy_name, interfaces, access_flags);
836 }
837 }
838
839 void AOTConstantPoolResolver::init_dynamic_proxy_cache(TRAPS) {
840 static bool inited = false;
841 if (inited) {
842 return;
843 }
844 inited = true;
845
846 Klass* klass = resolve_boot_class_or_fail("java/lang/reflect/Proxy", CHECK);
847 TempNewSymbol method = SymbolTable::new_symbol("initCacheForCDS");
848 TempNewSymbol signature = SymbolTable::new_symbol("(Ljava/lang/ClassLoader;Ljava/lang/ClassLoader;)V");
849
850 JavaCallArguments args;
851 args.push_oop(Handle(THREAD, SystemDictionary::java_platform_loader()));
852 args.push_oop(Handle(THREAD, SystemDictionary::java_system_loader()));
853 JavaValue result(T_VOID);
854 JavaCalls::call_static(&result,
855 klass,
856 method,
857 signature,
858 &args, CHECK);
859 }
860
861
862 void AOTConstantPoolResolver::define_dynamic_proxy_class(Handle loader, Handle proxy_name, Handle interfaces, int access_flags, TRAPS) {
863 if (!CDSConfig::is_dumping_dynamic_proxies()) {
864 return;
865 }
866 init_dynamic_proxy_cache(CHECK);
867
868 Klass* klass = resolve_boot_class_or_fail("java/lang/reflect/Proxy$ProxyBuilder", CHECK);
869 TempNewSymbol method = SymbolTable::new_symbol("defineProxyClassForCDS");
870 TempNewSymbol signature = SymbolTable::new_symbol("(Ljava/lang/ClassLoader;Ljava/lang/String;[Ljava/lang/Class;I)Ljava/lang/Class;");
871
872 JavaCallArguments args;
873 args.push_oop(Handle(THREAD, loader()));
874 args.push_oop(Handle(THREAD, proxy_name()));
875 args.push_oop(Handle(THREAD, interfaces()));
876 args.push_int(access_flags);
877 JavaValue result(T_OBJECT);
878 JavaCalls::call_static(&result,
879 klass,
880 method,
881 signature,
882 &args, CHECK);
883
884 // Assumptions:
885 // FMG is archived, which means -modulepath and -Xbootclasspath are both not specified.
886 // All named modules are loaded from the system modules files.
887 // TODO: test support for -Xbootclasspath after JDK-8322322. Some of the code below need to be changed.
888 // TODO: we just give dummy shared_classpath_index for the generated class so that it will be archived.
889 // The index is not used at runtime (see SystemDictionaryShared::load_shared_class_for_builtin_loader, which
890 // uses a null ProtectionDomain for this class)
891 oop mirror = result.get_oop();
892 assert(mirror != nullptr, "class must have been generated if not OOM");
893 InstanceKlass* ik = InstanceKlass::cast(java_lang_Class::as_Klass(mirror));
894 if (ik->defined_by_boot_loader() || ik->defined_by_platform_loader()) {
895 assert(ik->module()->is_named(), "dynamic proxies defined in unnamed modules for boot/platform loaders not supported");
896 ik->set_shared_classpath_index(0);
897 } else {
898 assert(ik->defined_by_app_loader(), "must be");
899 ik->set_shared_classpath_index(AOTClassLocationConfig::dumptime()->app_cp_start_index());
900 }
901
902 ArchiveBuilder::alloc_stats()->record_dynamic_proxy_class();
903 if (log_is_enabled(Info, cds, dynamic, proxy)) {
904 ResourceMark rm(THREAD);
905 stringStream ss;
906 const char* prefix = "";
907 ss.print("%s (%-7s, cp index = %d) implements ", ik->external_name(),
908 ArchiveUtils::builtin_loader_name(loader()), ik->shared_classpath_index());
909 objArrayOop intfs = (objArrayOop)interfaces();
910 for (int i = 0; i < intfs->length(); i++) {
911 oop intf_mirror = intfs->obj_at(i);
912 ss.print("%s%s", prefix, java_lang_Class::as_Klass(intf_mirror)->external_name());
913 prefix = ", ";
914 }
915
916 log_info(cds, dynamic, proxy)("%s", ss.freeze());
917 }
918 }
|