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()) {
131 } else if (resolved_class->is_typeArray_klass()) {
132 return true;
133 } else {
134 return false;
135 }
136 }
137
138 void AOTConstantPoolResolver::preresolve_string_cp_entries(InstanceKlass* ik, TRAPS) {
139 if (!ik->is_linked()) {
140 // The cp->resolved_referenced() array is not ready yet, so we can't call resolve_string().
141 return;
142 }
143 constantPoolHandle cp(THREAD, ik->constants());
144 for (int cp_index = 1; cp_index < cp->length(); cp_index++) { // Index 0 is unused
145 switch (cp->tag_at(cp_index).value()) {
146 case JVM_CONSTANT_String:
147 resolve_string(cp, cp_index, CHECK); // may throw OOM when interning strings.
148 break;
149 }
150 }
151 }
152
153 // This works only for the boot/platform/app loaders
154 Klass* AOTConstantPoolResolver::find_loaded_class(Thread* current, oop class_loader, Symbol* name) {
155 HandleMark hm(current);
156 Handle h_loader(current, class_loader);
157 Klass* k = SystemDictionary::find_instance_or_array_klass(current, name, h_loader);
158 if (k != nullptr) {
159 return k;
160 }
161 if (h_loader() == SystemDictionary::java_system_loader()) {
162 return find_loaded_class(current, SystemDictionary::java_platform_loader(), name);
163 } else if (h_loader() == SystemDictionary::java_platform_loader()) {
164 return find_loaded_class(current, nullptr, name);
165 } else {
166 assert(h_loader() == nullptr, "This function only works for boot/platform/app loaders %p %p %p",
167 cast_from_oop<address>(h_loader()),
168 cast_from_oop<address>(SystemDictionary::java_system_loader()),
169 cast_from_oop<address>(SystemDictionary::java_platform_loader()));
170 }
593
594 // dynamicMethodType
595 if (!check_lambda_metafactory_methodtype_arg(cp, bsms_attribute_index, 2)) {
596 return false;
597 }
598
599 return true;
600 }
601
602 return false;
603 }
604 #ifdef ASSERT
605 bool AOTConstantPoolResolver::is_in_archivebuilder_buffer(address p) {
606 if (!Thread::current()->is_VM_thread() || ArchiveBuilder::current() == nullptr) {
607 return false;
608 } else {
609 return ArchiveBuilder::current()->is_in_buffer_space(p);
610 }
611 }
612 #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()) {
143 } else if (resolved_class->is_typeArray_klass()) {
144 return true;
145 } else {
146 return false;
147 }
148 }
149
150 void AOTConstantPoolResolver::preresolve_string_cp_entries(InstanceKlass* ik, TRAPS) {
151 if (!ik->is_linked()) {
152 // The cp->resolved_referenced() array is not ready yet, so we can't call resolve_string().
153 return;
154 }
155 constantPoolHandle cp(THREAD, ik->constants());
156 for (int cp_index = 1; cp_index < cp->length(); cp_index++) { // Index 0 is unused
157 switch (cp->tag_at(cp_index).value()) {
158 case JVM_CONSTANT_String:
159 resolve_string(cp, cp_index, CHECK); // may throw OOM when interning strings.
160 break;
161 }
162 }
163
164 // Normally, we don't want to archive any CP entries that were not resolved
165 // in the training run. Otherwise the AOT/JIT may inline too much code that has not
166 // been executed.
167 //
168 // However, we want to aggressively resolve all klass/field/method constants for
169 // LambdaForm Invoker Holder classes, Lambda Proxy classes, and LambdaForm classes,
170 // so that the compiler can inline through them.
171 if (SystemDictionaryShared::is_builtin_loader(ik->class_loader_data())) {
172 bool eager_resolve = false;
173
174 if (LambdaFormInvokers::may_be_regenerated_class(ik->name())) {
175 eager_resolve = true;
176 }
177 if (ik->is_hidden() && HeapShared::is_archivable_hidden_klass(ik)) {
178 eager_resolve = true;
179 }
180
181 if (eager_resolve) {
182 preresolve_class_cp_entries(THREAD, ik, nullptr);
183 preresolve_field_and_method_cp_entries(THREAD, ik, nullptr);
184 }
185 }
186 }
187
188 // This works only for the boot/platform/app loaders
189 Klass* AOTConstantPoolResolver::find_loaded_class(Thread* current, oop class_loader, Symbol* name) {
190 HandleMark hm(current);
191 Handle h_loader(current, class_loader);
192 Klass* k = SystemDictionary::find_instance_or_array_klass(current, name, h_loader);
193 if (k != nullptr) {
194 return k;
195 }
196 if (h_loader() == SystemDictionary::java_system_loader()) {
197 return find_loaded_class(current, SystemDictionary::java_platform_loader(), name);
198 } else if (h_loader() == SystemDictionary::java_platform_loader()) {
199 return find_loaded_class(current, nullptr, name);
200 } else {
201 assert(h_loader() == nullptr, "This function only works for boot/platform/app loaders %p %p %p",
202 cast_from_oop<address>(h_loader()),
203 cast_from_oop<address>(SystemDictionary::java_system_loader()),
204 cast_from_oop<address>(SystemDictionary::java_platform_loader()));
205 }
628
629 // dynamicMethodType
630 if (!check_lambda_metafactory_methodtype_arg(cp, bsms_attribute_index, 2)) {
631 return false;
632 }
633
634 return true;
635 }
636
637 return false;
638 }
639 #ifdef ASSERT
640 bool AOTConstantPoolResolver::is_in_archivebuilder_buffer(address p) {
641 if (!Thread::current()->is_VM_thread() || ArchiveBuilder::current() == nullptr) {
642 return false;
643 } else {
644 return ArchiveBuilder::current()->is_in_buffer_space(p);
645 }
646 }
647 #endif
648
649 // Paranoid check -- if any field/method signature in <ik> is referencing a class that is known to be
650 // excluded, do not archive any reflection data in <ik>.
651 bool AOTConstantPoolResolver::check_signature_for_reflection_data(InstanceKlass* ik, Symbol* sig, bool is_method) {
652 precond(SafepointSynchronize::is_at_safepoint());
653 ResourceMark rm;
654 for (SignatureStream ss(sig, is_method); !ss.is_done(); ss.next()) {
655 if (ss.is_reference()) {
656 Symbol* klass_name = ss.as_symbol(/*probe_only=*/true);
657 if (klass_name == nullptr) {
658 // This symbol has never been created during the assembly phase, so it can't
659 // possibly be referencing an excluded class.
660 continue;
661 }
662 if (Signature::is_array(klass_name)) {
663 SignatureStream ss2(klass_name, false);
664 ss2.skip_array_prefix();
665 if (ss2.is_reference() && ss2.as_symbol(/*probe_only=*/true) == nullptr) {
666 // klass_name is an array klass that has not been loaded during the assembly phase, so it can't
667 // possibly be referencing an excluded class.
668 continue;
669 }
670 }
671 Klass* k = find_loaded_class(Thread::current(), ik->class_loader(), klass_name);
672 if (k == nullptr) {
673 // No class of this name has been loaded for this loader, so this name can't
674 // possibly be referencing an excluded class.
675 continue;
676 }
677 if (SystemDictionaryShared::should_be_excluded(k)) {
678 if (log_is_enabled(Warning, aot, resolve)) {
679 ResourceMark rm;
680 log_warning(aot, resolve)("Cannot archive reflection data in %s because it refers to excluded class %s",
681 ik->external_name(), k->external_name());
682 }
683 return false;
684 }
685 }
686 }
687 return true;
688 }
689
690 bool AOTConstantPoolResolver::can_archive_reflection_data_declared_fields(InstanceKlass* ik) {
691 for (JavaFieldStream fs(ik); !fs.done(); fs.next()) {
692 if (!check_signature_for_reflection_data(ik, fs.signature(), /*is_method=*/false)) {
693 return false;
694 }
695 }
696
697 return true;
698 }
699
700 bool AOTConstantPoolResolver::can_archive_reflection_data_declared_methods(InstanceKlass* ik) {
701 Array<Method*>* methods = ik->methods();
702 for (int i = 0; i < methods->length(); i++) {
703 Method* m = methods->at(i);
704 if (!check_signature_for_reflection_data(ik, m->signature(), /*is_method=*/true)) {
705 return false;
706 }
707 }
708
709 return true;
710 }
711
712 // This is called by AOT assembly phase to see if java_lang_Class::reflection_data(k) can be
713 // archived.
714 bool AOTConstantPoolResolver::can_archive_reflection_data(InstanceKlass* ik) {
715 // At this point, we have resolved the reflection data of *all* classes
716 // recorded by FinalImageRecipes.
717 // When we are in the AOT safepoint, we will archive the reflection
718 // data of <ik> *only if* it doesn't reference any excluded classes.
719 precond(SafepointSynchronize::is_at_safepoint());
720
721 if (!can_archive_reflection_data_declared_fields(ik)) {
722 return false;
723 }
724 if (!can_archive_reflection_data_declared_methods(ik)) {
725 return false;
726 }
727
728 if (log_is_enabled(Info, aot, resolve)) {
729 ResourceMark rm;
730 log_info(aot, resolve)("Archived reflection data in %s", ik->external_name());
731 }
732
733 return true;
734 }
735
736 int AOTConstantPoolResolver::class_reflection_data_flags(InstanceKlass* ik, TRAPS) {
737 assert(java_lang_Class::has_reflection_data(ik->java_mirror()), "must be");
738
739 HandleMark hm(THREAD);
740 JavaCallArguments args(Handle(THREAD, ik->java_mirror()));
741 JavaValue result(T_INT);
742 JavaCalls::call_special(&result,
743 vmClasses::Class_klass(),
744 vmSymbols::encodeReflectionData_name(),
745 vmSymbols::void_int_signature(),
746 &args, CHECK_0);
747 int flags = result.get_jint();
748 aot_log_info(aot)("Encode ReflectionData: %s (flags=0x%x)", ik->external_name(), flags);
749 return flags;
750 }
751
752 void AOTConstantPoolResolver::generate_reflection_data(JavaThread* current, InstanceKlass* ik, int rd_flags) {
753 aot_log_info(aot)("Generate ReflectionData: %s (flags=" INT32_FORMAT_X ")", ik->external_name(), rd_flags);
754 JavaThread* THREAD = current; // for exception macros
755 JavaCallArguments args(Handle(THREAD, ik->java_mirror()));
756 args.push_int(rd_flags);
757 JavaValue result(T_OBJECT);
758 JavaCalls::call_special(&result,
759 vmClasses::Class_klass(),
760 vmSymbols::generateReflectionData_name(),
761 vmSymbols::int_void_signature(),
762 &args, THREAD);
763 if (HAS_PENDING_EXCEPTION) {
764 Handle exc_handle(THREAD, PENDING_EXCEPTION);
765 CLEAR_PENDING_EXCEPTION;
766
767 log_warning(aot)("Exception during Class::generateReflectionData() call for %s", ik->external_name());
768 LogStreamHandle(Debug, aot) log;
769 if (log.is_enabled()) {
770 java_lang_Throwable::print_stack_trace(exc_handle, &log);
771 }
772 }
773 }
774
775 Klass* AOTConstantPoolResolver::resolve_boot_class_or_fail(const char* class_name, TRAPS) {
776 Handle class_loader;
777 TempNewSymbol class_name_sym = SymbolTable::new_symbol(class_name);
778 return SystemDictionary::resolve_or_fail(class_name_sym, class_loader, true, THREAD);
779 }
780
781 void AOTConstantPoolResolver::trace_dynamic_proxy_class(oop loader, const char* proxy_name, objArrayOop interfaces, int access_flags) {
782 if (interfaces->length() < 1) {
783 return;
784 }
785 if (CDSConfig::is_dumping_preimage_static_archive()) {
786 FinalImageRecipes::add_dynamic_proxy_class(loader, proxy_name, interfaces, access_flags);
787 }
788 }
789
790 void AOTConstantPoolResolver::init_dynamic_proxy_cache(TRAPS) {
791 static bool inited = false;
792 if (inited) {
793 return;
794 }
795 inited = true;
796
797 Klass* klass = resolve_boot_class_or_fail("java/lang/reflect/Proxy", CHECK);
798 TempNewSymbol method = SymbolTable::new_symbol("initCacheForCDS");
799 TempNewSymbol signature = SymbolTable::new_symbol("(Ljava/lang/ClassLoader;Ljava/lang/ClassLoader;)V");
800
801 JavaCallArguments args;
802 args.push_oop(Handle(THREAD, SystemDictionary::java_platform_loader()));
803 args.push_oop(Handle(THREAD, SystemDictionary::java_system_loader()));
804 JavaValue result(T_VOID);
805 JavaCalls::call_static(&result,
806 klass,
807 method,
808 signature,
809 &args, CHECK);
810 }
811
812
813 void AOTConstantPoolResolver::define_dynamic_proxy_class(Handle loader, Handle proxy_name, Handle interfaces, int access_flags, TRAPS) {
814 if (!CDSConfig::is_dumping_dynamic_proxies()) {
815 return;
816 }
817 init_dynamic_proxy_cache(CHECK);
818
819 Klass* klass = resolve_boot_class_or_fail("java/lang/reflect/Proxy$ProxyBuilder", CHECK);
820 TempNewSymbol method = SymbolTable::new_symbol("defineProxyClassForCDS");
821 TempNewSymbol signature = SymbolTable::new_symbol("(Ljava/lang/ClassLoader;Ljava/lang/String;[Ljava/lang/Class;I)Ljava/lang/Class;");
822
823 JavaCallArguments args;
824 args.push_oop(Handle(THREAD, loader()));
825 args.push_oop(Handle(THREAD, proxy_name()));
826 args.push_oop(Handle(THREAD, interfaces()));
827 args.push_int(access_flags);
828 JavaValue result(T_OBJECT);
829 JavaCalls::call_static(&result,
830 klass,
831 method,
832 signature,
833 &args, CHECK);
834
835 // Assumptions:
836 // FMG is archived, which means -modulepath and -Xbootclasspath are both not specified.
837 // All named modules are loaded from the system modules files.
838 // TODO: test support for -Xbootclasspath after JDK-8322322. Some of the code below need to be changed.
839 // TODO: we just give dummy shared_classpath_index for the generated class so that it will be archived.
840 // The index is not used at runtime (see SystemDictionaryShared::load_shared_class_for_builtin_loader, which
841 // uses a null ProtectionDomain for this class)
842 oop mirror = result.get_oop();
843 assert(mirror != nullptr, "class must have been generated if not OOM");
844 InstanceKlass* ik = InstanceKlass::cast(java_lang_Class::as_Klass(mirror));
845 if (ik->defined_by_boot_loader() || ik->defined_by_platform_loader()) {
846 assert(ik->module()->is_named(), "dynamic proxies defined in unnamed modules for boot/platform loaders not supported");
847 ik->set_shared_classpath_index(0);
848 } else {
849 assert(ik->defined_by_app_loader(), "must be");
850 ik->set_shared_classpath_index(AOTClassLocationConfig::dumptime()->app_cp_start_index());
851 }
852
853 ArchiveBuilder::alloc_stats()->record_dynamic_proxy_class();
854 if (log_is_enabled(Info, cds, dynamic, proxy)) {
855 ResourceMark rm(THREAD);
856 stringStream ss;
857 const char* prefix = "";
858 ss.print("%s (%-7s, cp index = %d) implements ", ik->external_name(),
859 ArchiveUtils::builtin_loader_name(loader()), ik->shared_classpath_index());
860 objArrayOop intfs = (objArrayOop)interfaces();
861 for (int i = 0; i < intfs->length(); i++) {
862 oop intf_mirror = intfs->obj_at(i);
863 ss.print("%s%s", prefix, java_lang_Class::as_Klass(intf_mirror)->external_name());
864 prefix = ", ";
865 }
866
867 log_info(cds, dynamic, proxy)("%s", ss.freeze());
868 }
869 }
|