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()) {
127 } else if (resolved_class->is_typeArray_klass()) {
128 return true;
129 } else {
130 return false;
131 }
132 }
133
134 void AOTConstantPoolResolver::preresolve_string_cp_entries(InstanceKlass* ik, TRAPS) {
135 if (!ik->is_linked()) {
136 // The cp->resolved_referenced() array is not ready yet, so we can't call resolve_string().
137 return;
138 }
139 constantPoolHandle cp(THREAD, ik->constants());
140 for (int cp_index = 1; cp_index < cp->length(); cp_index++) { // Index 0 is unused
141 switch (cp->tag_at(cp_index).value()) {
142 case JVM_CONSTANT_String:
143 resolve_string(cp, cp_index, CHECK); // may throw OOM when interning strings.
144 break;
145 }
146 }
147 }
148
149 // This works only for the boot/platform/app loaders
150 Klass* AOTConstantPoolResolver::find_loaded_class(Thread* current, oop class_loader, Symbol* name) {
151 HandleMark hm(current);
152 Handle h_loader(current, class_loader);
153 Klass* k = SystemDictionary::find_instance_or_array_klass(current, name, h_loader);
154 if (k != nullptr) {
155 return k;
156 }
157 if (h_loader() == SystemDictionary::java_system_loader()) {
158 return find_loaded_class(current, SystemDictionary::java_platform_loader(), name);
159 } else if (h_loader() == SystemDictionary::java_platform_loader()) {
160 return find_loaded_class(current, nullptr, name);
161 } else {
162 assert(h_loader() == nullptr, "This function only works for boot/platform/app loaders %p %p %p",
163 cast_from_oop<address>(h_loader()),
164 cast_from_oop<address>(SystemDictionary::java_system_loader()),
165 cast_from_oop<address>(SystemDictionary::java_platform_loader()));
166 }
589
590 // dynamicMethodType
591 if (!check_lambda_metafactory_methodtype_arg(cp, bsms_attribute_index, 2)) {
592 return false;
593 }
594
595 return true;
596 }
597
598 return false;
599 }
600 #ifdef ASSERT
601 bool AOTConstantPoolResolver::is_in_archivebuilder_buffer(address p) {
602 if (!Thread::current()->is_VM_thread() || ArchiveBuilder::current() == nullptr) {
603 return false;
604 } else {
605 return ArchiveBuilder::current()->is_in_buffer_space(p);
606 }
607 }
608 #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/classListWriter.hpp"
33 #include "cds/finalImageRecipes.hpp"
34 #include "cds/heapShared.hpp"
35 #include "cds/lambdaFormInvokers.inline.hpp"
36 #include "classfile/classLoader.hpp"
37 #include "classfile/dictionary.hpp"
38 #include "classfile/symbolTable.hpp"
39 #include "classfile/systemDictionary.hpp"
40 #include "classfile/systemDictionaryShared.hpp"
41 #include "classfile/vmClasses.hpp"
42 #include "interpreter/bytecodeStream.hpp"
43 #include "interpreter/interpreterRuntime.hpp"
44 #include "memory/resourceArea.hpp"
45 #include "oops/constantPool.inline.hpp"
46 #include "oops/fieldStreams.inline.hpp"
47 #include "oops/instanceKlass.hpp"
48 #include "oops/klass.inline.hpp"
49 #include "runtime/handles.inline.hpp"
50 #include "runtime/javaCalls.hpp"
51 #include "runtime/signature.hpp"
52
53 // Returns true if we CAN PROVE that cp_index will always resolve to
54 // the same information at both dump time and run time. This is a
55 // necessary (but not sufficient) condition for pre-resolving cp_index
56 // during CDS archive assembly.
57 bool AOTConstantPoolResolver::is_resolution_deterministic(ConstantPool* cp, int cp_index) {
58 assert(!is_in_archivebuilder_buffer(cp), "sanity");
59
60 if (cp->tag_at(cp_index).is_klass()) {
61 // We require cp_index to be already resolved. This is fine for now, are we
62 // currently archive only CP entries that are already resolved.
63 Klass* resolved_klass = cp->resolved_klass_at(cp_index);
64 return resolved_klass != nullptr && is_class_resolution_deterministic(cp->pool_holder(), resolved_klass);
65 } else if (cp->tag_at(cp_index).is_invoke_dynamic()) {
66 return is_indy_resolution_deterministic(cp, cp_index);
67 } else if (cp->tag_at(cp_index).is_field() ||
68 cp->tag_at(cp_index).is_method() ||
69 cp->tag_at(cp_index).is_interface_method()) {
70 int klass_cp_index = cp->uncached_klass_ref_index_at(cp_index);
71 if (!cp->tag_at(klass_cp_index).is_klass()) {
140 } else if (resolved_class->is_typeArray_klass()) {
141 return true;
142 } else {
143 return false;
144 }
145 }
146
147 void AOTConstantPoolResolver::preresolve_string_cp_entries(InstanceKlass* ik, TRAPS) {
148 if (!ik->is_linked()) {
149 // The cp->resolved_referenced() array is not ready yet, so we can't call resolve_string().
150 return;
151 }
152 constantPoolHandle cp(THREAD, ik->constants());
153 for (int cp_index = 1; cp_index < cp->length(); cp_index++) { // Index 0 is unused
154 switch (cp->tag_at(cp_index).value()) {
155 case JVM_CONSTANT_String:
156 resolve_string(cp, cp_index, CHECK); // may throw OOM when interning strings.
157 break;
158 }
159 }
160
161 // Normally, we don't want to archive any CP entries that were not resolved
162 // in the training run. Otherwise the AOT/JIT may inline too much code that has not
163 // been executed.
164 //
165 // However, we want to aggressively resolve all klass/field/method constants for
166 // LambdaForm Invoker Holder classes, Lambda Proxy classes, and LambdaForm classes,
167 // so that the compiler can inline through them.
168 if (SystemDictionaryShared::is_builtin_loader(ik->class_loader_data())) {
169 bool eager_resolve = false;
170
171 if (LambdaFormInvokers::may_be_regenerated_class(ik->name())) {
172 eager_resolve = true;
173 }
174 if (ik->is_hidden() && HeapShared::is_archivable_hidden_klass(ik)) {
175 eager_resolve = true;
176 }
177
178 if (eager_resolve) {
179 preresolve_class_cp_entries(THREAD, ik, nullptr);
180 preresolve_field_and_method_cp_entries(THREAD, ik, nullptr);
181 }
182 }
183 }
184
185 // This works only for the boot/platform/app loaders
186 Klass* AOTConstantPoolResolver::find_loaded_class(Thread* current, oop class_loader, Symbol* name) {
187 HandleMark hm(current);
188 Handle h_loader(current, class_loader);
189 Klass* k = SystemDictionary::find_instance_or_array_klass(current, name, h_loader);
190 if (k != nullptr) {
191 return k;
192 }
193 if (h_loader() == SystemDictionary::java_system_loader()) {
194 return find_loaded_class(current, SystemDictionary::java_platform_loader(), name);
195 } else if (h_loader() == SystemDictionary::java_platform_loader()) {
196 return find_loaded_class(current, nullptr, name);
197 } else {
198 assert(h_loader() == nullptr, "This function only works for boot/platform/app loaders %p %p %p",
199 cast_from_oop<address>(h_loader()),
200 cast_from_oop<address>(SystemDictionary::java_system_loader()),
201 cast_from_oop<address>(SystemDictionary::java_platform_loader()));
202 }
625
626 // dynamicMethodType
627 if (!check_lambda_metafactory_methodtype_arg(cp, bsms_attribute_index, 2)) {
628 return false;
629 }
630
631 return true;
632 }
633
634 return false;
635 }
636 #ifdef ASSERT
637 bool AOTConstantPoolResolver::is_in_archivebuilder_buffer(address p) {
638 if (!Thread::current()->is_VM_thread() || ArchiveBuilder::current() == nullptr) {
639 return false;
640 } else {
641 return ArchiveBuilder::current()->is_in_buffer_space(p);
642 }
643 }
644 #endif
645
646 // Paranoid check -- if any field/method signature in <ik> is referencing a class that is known to be
647 // excluded, do not archive any reflection data in <ik>.
648 bool AOTConstantPoolResolver::check_signature_for_reflection_data(InstanceKlass* ik, Symbol* sig, bool is_method) {
649 precond(SafepointSynchronize::is_at_safepoint());
650 ResourceMark rm;
651 for (SignatureStream ss(sig, is_method); !ss.is_done(); ss.next()) {
652 if (ss.is_reference()) {
653 Symbol* klass_name = ss.as_symbol(/*probe_only=*/true);
654 if (klass_name == nullptr) {
655 // This symbol has never been created during the assembly phase, so it can't
656 // possibly be referencing an excluded class.
657 continue;
658 }
659 if (Signature::is_array(klass_name)) {
660 SignatureStream ss2(klass_name, false);
661 ss2.skip_array_prefix();
662 if (ss2.is_reference() && ss2.as_symbol(/*probe_only=*/true) == nullptr) {
663 // klass_name is an array klass that has not been loaded during the assembly phase, so it can't
664 // possibly be referencing an excluded class.
665 continue;
666 }
667 }
668 Klass* k = find_loaded_class(Thread::current(), ik->class_loader(), klass_name);
669 if (k == nullptr) {
670 // No class of this name has been loaded for this loader, so this name can't
671 // possibly be referencing an excluded class.
672 continue;
673 }
674 if (SystemDictionaryShared::should_be_excluded(k)) {
675 if (log_is_enabled(Warning, aot, resolve)) {
676 ResourceMark rm;
677 log_warning(aot, resolve)("Cannot archive reflection data in %s because it refers to excluded class %s",
678 ik->external_name(), k->external_name());
679 }
680 return false;
681 }
682 }
683 }
684 return true;
685 }
686
687 bool AOTConstantPoolResolver::can_archive_reflection_data_declared_fields(InstanceKlass* ik) {
688 for (JavaFieldStream fs(ik); !fs.done(); fs.next()) {
689 if (!check_signature_for_reflection_data(ik, fs.signature(), /*is_method=*/false)) {
690 return false;
691 }
692 }
693
694 return true;
695 }
696
697 bool AOTConstantPoolResolver::can_archive_reflection_data_declared_methods(InstanceKlass* ik) {
698 Array<Method*>* methods = ik->methods();
699 for (int i = 0; i < methods->length(); i++) {
700 Method* m = methods->at(i);
701 if (!check_signature_for_reflection_data(ik, m->signature(), /*is_method=*/true)) {
702 return false;
703 }
704 }
705
706 return true;
707 }
708
709 // This is called by AOT assembly phase to see if java_lang_Class::reflection_data(k) can be
710 // archived.
711 bool AOTConstantPoolResolver::can_archive_reflection_data(InstanceKlass* ik) {
712 // At this point, we have resolved the reflection data of *all* classes
713 // recorded by FinalImageRecipes.
714 // When we are in the AOT safepoint, we will archive the reflection
715 // data of <ik> *only if* it doesn't reference any excluded classes.
716 precond(SafepointSynchronize::is_at_safepoint());
717
718 if (!can_archive_reflection_data_declared_fields(ik)) {
719 return false;
720 }
721 if (!can_archive_reflection_data_declared_methods(ik)) {
722 return false;
723 }
724
725 if (log_is_enabled(Info, aot, resolve)) {
726 ResourceMark rm;
727 log_info(aot, resolve)("Archived reflection data in %s", ik->external_name());
728 }
729
730 return true;
731 }
732
733 int AOTConstantPoolResolver::class_reflection_data_flags(InstanceKlass* ik, TRAPS) {
734 assert(java_lang_Class::has_reflection_data(ik->java_mirror()), "must be");
735
736 HandleMark hm(THREAD);
737 JavaCallArguments args(Handle(THREAD, ik->java_mirror()));
738 JavaValue result(T_INT);
739 JavaCalls::call_special(&result,
740 vmClasses::Class_klass(),
741 vmSymbols::encodeReflectionData_name(),
742 vmSymbols::void_int_signature(),
743 &args, CHECK_0);
744 int flags = result.get_jint();
745 aot_log_info(aot)("Encode ReflectionData: %s (flags=0x%x)", ik->external_name(), flags);
746 return flags;
747 }
748
749 void AOTConstantPoolResolver::generate_reflection_data(JavaThread* current, InstanceKlass* ik, int rd_flags) {
750 aot_log_info(aot)("Generate ReflectionData: %s (flags=" INT32_FORMAT_X ")", ik->external_name(), rd_flags);
751 JavaThread* THREAD = current; // for exception macros
752 JavaCallArguments args(Handle(THREAD, ik->java_mirror()));
753 args.push_int(rd_flags);
754 JavaValue result(T_OBJECT);
755 JavaCalls::call_special(&result,
756 vmClasses::Class_klass(),
757 vmSymbols::generateReflectionData_name(),
758 vmSymbols::int_void_signature(),
759 &args, THREAD);
760 if (HAS_PENDING_EXCEPTION) {
761 Handle exc_handle(THREAD, PENDING_EXCEPTION);
762 CLEAR_PENDING_EXCEPTION;
763
764 log_warning(aot)("Exception during Class::generateReflectionData() call for %s", ik->external_name());
765 LogStreamHandle(Debug, aot) log;
766 if (log.is_enabled()) {
767 java_lang_Throwable::print_stack_trace(exc_handle, &log);
768 }
769 }
770 }
771
772 Klass* AOTConstantPoolResolver::resolve_boot_class_or_fail(const char* class_name, TRAPS) {
773 Handle class_loader;
774 TempNewSymbol class_name_sym = SymbolTable::new_symbol(class_name);
775 return SystemDictionary::resolve_or_fail(class_name_sym, class_loader, true, THREAD);
776 }
777
778 void AOTConstantPoolResolver::trace_dynamic_proxy_class(oop loader, const char* proxy_name, objArrayOop interfaces, int access_flags) {
779 if (interfaces->length() < 1) {
780 return;
781 }
782 if (ClassListWriter::is_enabled()) {
783 const char* loader_name = ArchiveUtils::builtin_loader_name_or_null(loader);
784 if (loader_name != nullptr) {
785 stringStream ss;
786 ss.print("%s %s %d %d", loader_name, proxy_name, access_flags, interfaces->length());
787 for (int i = 0; i < interfaces->length(); i++) {
788 oop mirror = interfaces->obj_at(i);
789 Klass* k = java_lang_Class::as_Klass(mirror);
790 ss.print(" %s", k->name()->as_C_string());
791 }
792 ClassListWriter w; // This locks ClassListFile_lock
793 w.stream()->print_cr("@dynamic-proxy %s", ss.freeze());
794 }
795 }
796 if (CDSConfig::is_dumping_preimage_static_archive()) {
797 FinalImageRecipes::add_dynamic_proxy_class(loader, proxy_name, interfaces, access_flags);
798 }
799 }
800
801 void AOTConstantPoolResolver::init_dynamic_proxy_cache(TRAPS) {
802 static bool inited = false;
803 if (inited) {
804 return;
805 }
806 inited = true;
807
808 Klass* klass = resolve_boot_class_or_fail("java/lang/reflect/Proxy", CHECK);
809 TempNewSymbol method = SymbolTable::new_symbol("initCacheForCDS");
810 TempNewSymbol signature = SymbolTable::new_symbol("(Ljava/lang/ClassLoader;Ljava/lang/ClassLoader;)V");
811
812 JavaCallArguments args;
813 args.push_oop(Handle(THREAD, SystemDictionary::java_platform_loader()));
814 args.push_oop(Handle(THREAD, SystemDictionary::java_system_loader()));
815 JavaValue result(T_VOID);
816 JavaCalls::call_static(&result,
817 klass,
818 method,
819 signature,
820 &args, CHECK);
821 }
822
823
824 void AOTConstantPoolResolver::define_dynamic_proxy_class(Handle loader, Handle proxy_name, Handle interfaces, int access_flags, TRAPS) {
825 if (!CDSConfig::is_dumping_dynamic_proxies()) {
826 return;
827 }
828 init_dynamic_proxy_cache(CHECK);
829
830 Klass* klass = resolve_boot_class_or_fail("java/lang/reflect/Proxy$ProxyBuilder", CHECK);
831 TempNewSymbol method = SymbolTable::new_symbol("defineProxyClassForCDS");
832 TempNewSymbol signature = SymbolTable::new_symbol("(Ljava/lang/ClassLoader;Ljava/lang/String;[Ljava/lang/Class;I)Ljava/lang/Class;");
833
834 JavaCallArguments args;
835 args.push_oop(Handle(THREAD, loader()));
836 args.push_oop(Handle(THREAD, proxy_name()));
837 args.push_oop(Handle(THREAD, interfaces()));
838 args.push_int(access_flags);
839 JavaValue result(T_OBJECT);
840 JavaCalls::call_static(&result,
841 klass,
842 method,
843 signature,
844 &args, CHECK);
845
846 // Assumptions:
847 // FMG is archived, which means -modulepath and -Xbootclasspath are both not specified.
848 // All named modules are loaded from the system modules files.
849 // TODO: test support for -Xbootclasspath after JDK-8322322. Some of the code below need to be changed.
850 // TODO: we just give dummy shared_classpath_index for the generated class so that it will be archived.
851 // The index is not used at runtime (see SystemDictionaryShared::load_shared_class_for_builtin_loader, which
852 // uses a null ProtectionDomain for this class)
853 oop mirror = result.get_oop();
854 assert(mirror != nullptr, "class must have been generated if not OOM");
855 InstanceKlass* ik = InstanceKlass::cast(java_lang_Class::as_Klass(mirror));
856 if (ik->defined_by_boot_loader() || ik->defined_by_platform_loader()) {
857 assert(ik->module()->is_named(), "dynamic proxies defined in unnamed modules for boot/platform loaders not supported");
858 ik->set_shared_classpath_index(0);
859 } else {
860 assert(ik->defined_by_app_loader(), "must be");
861 ik->set_shared_classpath_index(AOTClassLocationConfig::dumptime()->app_cp_start_index());
862 }
863
864 ArchiveBuilder::alloc_stats()->record_dynamic_proxy_class();
865 if (log_is_enabled(Info, cds, dynamic, proxy)) {
866 ResourceMark rm(THREAD);
867 stringStream ss;
868 const char* prefix = "";
869 ss.print("%s (%-7s, cp index = %d) implements ", ik->external_name(),
870 ArchiveUtils::builtin_loader_name(loader()), ik->shared_classpath_index());
871 objArrayOop intfs = (objArrayOop)interfaces();
872 for (int i = 0; i < intfs->length(); i++) {
873 oop intf_mirror = intfs->obj_at(i);
874 ss.print("%s%s", prefix, java_lang_Class::as_Klass(intf_mirror)->external_name());
875 prefix = ", ";
876 }
877
878 log_info(cds, dynamic, proxy)("%s", ss.freeze());
879 }
880 }
|