110 IS_METHOD = java_lang_invoke_MemberName::MN_IS_METHOD,
111 IS_CONSTRUCTOR = java_lang_invoke_MemberName::MN_IS_CONSTRUCTOR,
112 IS_FIELD = java_lang_invoke_MemberName::MN_IS_FIELD,
113 IS_TYPE = java_lang_invoke_MemberName::MN_IS_TYPE,
114 CALLER_SENSITIVE = java_lang_invoke_MemberName::MN_CALLER_SENSITIVE,
115 REFERENCE_KIND_SHIFT = java_lang_invoke_MemberName::MN_REFERENCE_KIND_SHIFT,
116 REFERENCE_KIND_MASK = java_lang_invoke_MemberName::MN_REFERENCE_KIND_MASK,
117 SEARCH_SUPERCLASSES = java_lang_invoke_MemberName::MN_SEARCH_SUPERCLASSES,
118 SEARCH_INTERFACES = java_lang_invoke_MemberName::MN_SEARCH_INTERFACES,
119 ALL_KINDS = IS_METHOD | IS_CONSTRUCTOR | IS_FIELD | IS_TYPE
120 };
121
122 Handle MethodHandles::new_MemberName(TRAPS) {
123 Handle empty;
124 instanceKlassHandle k(THREAD, SystemDictionary::MemberName_klass());
125 if (!k->is_initialized()) k->initialize(CHECK_(empty));
126 return Handle(THREAD, k->allocate_instance(THREAD));
127 }
128
129 oop MethodHandles::init_MemberName(Handle mname, Handle target) {
130 Thread* thread = Thread::current();
131 oop target_oop = target();
132 Klass* target_klass = target_oop->klass();
133 if (target_klass == SystemDictionary::reflect_Field_klass()) {
134 oop clazz = java_lang_reflect_Field::clazz(target_oop); // fd.field_holder()
135 int slot = java_lang_reflect_Field::slot(target_oop); // fd.index()
136 int mods = java_lang_reflect_Field::modifiers(target_oop);
137 oop type = java_lang_reflect_Field::type(target_oop);
138 oop name = java_lang_reflect_Field::name(target_oop);
139 KlassHandle k(thread, java_lang_Class::as_Klass(clazz));
140 intptr_t offset = InstanceKlass::cast(k())->field_offset(slot);
141 return init_field_MemberName(mname, k, accessFlags_from(mods), type, name, offset);
142 } else if (target_klass == SystemDictionary::reflect_Method_klass()) {
143 oop clazz = java_lang_reflect_Method::clazz(target_oop);
144 int slot = java_lang_reflect_Method::slot(target_oop);
145 KlassHandle k(thread, java_lang_Class::as_Klass(clazz));
146 if (!k.is_null() && k->oop_is_instance()) {
147 Method* m = InstanceKlass::cast(k())->method_with_idnum(slot);
148 return init_method_MemberName(mname, m, true, k);
149 }
150 } else if (target_klass == SystemDictionary::reflect_Constructor_klass()) {
151 oop clazz = java_lang_reflect_Constructor::clazz(target_oop);
152 int slot = java_lang_reflect_Constructor::slot(target_oop);
153 KlassHandle k(thread, java_lang_Class::as_Klass(clazz));
154 if (!k.is_null() && k->oop_is_instance()) {
155 Method* m = InstanceKlass::cast(k())->method_with_idnum(slot);
156 return init_method_MemberName(mname, m, false, k);
157 }
158 } else if (target_klass == SystemDictionary::MemberName_klass()) {
159 // Note: This only works if the MemberName has already been resolved.
160 oop clazz = java_lang_invoke_MemberName::clazz(target_oop);
161 int flags = java_lang_invoke_MemberName::flags(target_oop);
162 Metadata* vmtarget=java_lang_invoke_MemberName::vmtarget(target_oop);
163 intptr_t vmindex = java_lang_invoke_MemberName::vmindex(target_oop);
164 KlassHandle k(thread, java_lang_Class::as_Klass(clazz));
165 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK;
166 if (vmtarget == NULL) return NULL; // not resolved
167 if ((flags & IS_FIELD) != 0) {
168 assert(vmtarget->is_klass(), "field vmtarget is Klass*");
169 int basic_mods = (ref_kind_is_static(ref_kind) ? JVM_ACC_STATIC : 0);
170 // FIXME: how does k (receiver_limit) contribute?
171 KlassHandle k_vmtarget(thread, (Klass*)vmtarget);
172 return init_field_MemberName(mname, k_vmtarget, accessFlags_from(basic_mods), NULL, NULL, vmindex);
173 } else if ((flags & (IS_METHOD | IS_CONSTRUCTOR)) != 0) {
174 assert(vmtarget->is_method(), "method or constructor vmtarget is Method*");
175 return init_method_MemberName(mname, (Method*)vmtarget, ref_kind_does_dispatch(ref_kind), k);
176 } else {
177 return NULL;
178 }
179 }
180 return NULL;
181 }
182
183 oop MethodHandles::init_method_MemberName(Handle mname, Method* m, bool do_dispatch,
184 KlassHandle receiver_limit_h) {
185 Klass* receiver_limit = receiver_limit_h();
186 AccessFlags mods = m->access_flags();
187 int flags = (jushort)( mods.as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS );
188 int vmindex = Method::nonvirtual_vtable_index; // implies never any dispatch
189 Klass* mklass = m->method_holder();
190 if (receiver_limit == NULL)
191 receiver_limit = mklass;
192 if (m->is_initializer()) {
193 flags |= IS_CONSTRUCTOR | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT);
194 } else if (mods.is_static()) {
195 flags |= IS_METHOD | (JVM_REF_invokeStatic << REFERENCE_KIND_SHIFT);
196 } else if (receiver_limit != mklass &&
197 !receiver_limit->is_subtype_of(mklass)) {
198 return NULL; // bad receiver limit
199 } else if (do_dispatch && receiver_limit->is_interface() &&
200 mklass->is_interface()) {
201 flags |= IS_METHOD | (JVM_REF_invokeInterface << REFERENCE_KIND_SHIFT);
202 receiver_limit = mklass; // ignore passed-in limit; interfaces are interconvertible
203 vmindex = klassItable::compute_itable_index(m);
204 } else if (do_dispatch && mklass != receiver_limit && mklass->is_interface()) {
205 flags |= IS_METHOD | (JVM_REF_invokeVirtual << REFERENCE_KIND_SHIFT);
206 // it is a miranda method, so m->vtable_index is not what we want
207 ResourceMark rm;
208 klassVtable* vt = InstanceKlass::cast(receiver_limit)->vtable();
209 vmindex = vt->index_of_miranda(m->name(), m->signature());
210 } else if (!do_dispatch || m->can_be_statically_bound()) {
211 flags |= IS_METHOD | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT);
212 } else {
213 flags |= IS_METHOD | (JVM_REF_invokeVirtual << REFERENCE_KIND_SHIFT);
214 vmindex = m->vtable_index();
215 }
216
217 // @CallerSensitive annotation detected
218 if (m->caller_sensitive()) {
219 flags |= CALLER_SENSITIVE;
220 }
221
222 oop mname_oop = mname();
223 java_lang_invoke_MemberName::set_flags( mname_oop, flags);
224 java_lang_invoke_MemberName::set_vmtarget(mname_oop, m);
225 java_lang_invoke_MemberName::set_vmindex( mname_oop, vmindex); // vtable/itable index
226 java_lang_invoke_MemberName::set_clazz( mname_oop, receiver_limit->java_mirror());
227 // Note: name and type can be lazily computed by resolve_MemberName,
228 // if Java code needs them as resolved String and MethodType objects.
229 // The clazz must be eagerly stored, because it provides a GC
230 // root to help keep alive the Method*.
231 // If relevant, the vtable or itable value is stored as vmindex.
232 // This is done eagerly, since it is readily available without
233 // constructing any new objects.
234 // TO DO: maybe intern mname_oop
235 m->method_holder()->add_member_name(m->method_idnum(), mname);
236
237 return mname();
238 }
239
240 Handle MethodHandles::init_method_MemberName(Handle mname, CallInfo& info, TRAPS) {
241 Handle empty;
242 if (info.resolved_appendix().not_null()) {
243 // The resolved MemberName must not be accompanied by an appendix argument,
244 // since there is no way to bind this value into the MemberName.
245 // Caller is responsible to prevent this from happening.
246 THROW_MSG_(vmSymbols::java_lang_InternalError(), "appendix", empty);
247 }
248 methodHandle m = info.resolved_method();
249 KlassHandle defc = info.resolved_klass();
250 int vmindex = Method::invalid_vtable_index;
251 if (defc->is_interface() && m->method_holder()->is_interface()) {
252 // static interface methods do not reference vtable or itable
253 if (m->is_static()) {
254 vmindex = Method::nonvirtual_vtable_index;
255 }
256 // interface methods invoked via invokespecial also
257 // do not reference vtable or itable.
258 int ref_kind = ((java_lang_invoke_MemberName::flags(mname()) >>
259 REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK);
260 if (ref_kind == JVM_REF_invokeSpecial) {
261 vmindex = Method::nonvirtual_vtable_index;
262 }
263 // If neither m is static nor ref_kind is invokespecial,
264 // set it to itable index.
265 if (vmindex == Method::invalid_vtable_index) {
266 // LinkResolver does not report itable indexes! (fix this?)
267 vmindex = klassItable::compute_itable_index(m());
268 }
269 } else if (m->can_be_statically_bound()) {
270 // LinkResolver reports vtable index even for final methods!
271 vmindex = Method::nonvirtual_vtable_index;
272 } else {
273 vmindex = info.vtable_index();
274 }
275 oop res = init_method_MemberName(mname, m(), (vmindex >= 0), defc());
276 assert(res == NULL || (java_lang_invoke_MemberName::vmindex(res) == vmindex), "");
277 return Handle(THREAD, res);
278 }
279
280 oop MethodHandles::init_field_MemberName(Handle mname, KlassHandle field_holder,
281 AccessFlags mods, oop type, oop name,
282 intptr_t offset, bool is_setter) {
283 int flags = (jushort)( mods.as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS );
284 flags |= IS_FIELD | ((mods.is_static() ? JVM_REF_getStatic : JVM_REF_getField) << REFERENCE_KIND_SHIFT);
285 if (is_setter) flags += ((JVM_REF_putField - JVM_REF_getField) << REFERENCE_KIND_SHIFT);
286 Metadata* vmtarget = field_holder();
287 int vmindex = offset; // determines the field uniquely when combined with static bit
288 oop mname_oop = mname();
289 java_lang_invoke_MemberName::set_flags(mname_oop, flags);
290 java_lang_invoke_MemberName::set_vmtarget(mname_oop, vmtarget);
291 java_lang_invoke_MemberName::set_vmindex(mname_oop, vmindex);
292 java_lang_invoke_MemberName::set_clazz(mname_oop, field_holder->java_mirror());
293 if (name != NULL)
294 java_lang_invoke_MemberName::set_name(mname_oop, name);
295 if (type != NULL)
296 java_lang_invoke_MemberName::set_type(mname_oop, type);
297 // Note: name and type can be lazily computed by resolve_MemberName,
298 // if Java code needs them as resolved String and Class objects.
299 // Note that the incoming type oop might be pre-resolved (non-null).
300 // The base clazz and field offset (vmindex) must be eagerly stored,
301 // because they unambiguously identify the field.
302 // Although the fieldDescriptor::_index would also identify the field,
303 // we do not use it, because it is harder to decode.
304 // TO DO: maybe intern mname_oop
305 return mname();
306 }
307
308 Handle MethodHandles::init_field_MemberName(Handle mname, FieldAccessInfo& info, TRAPS) {
309 return Handle();
310 #if 0 // FIXME
311 KlassHandle field_holder = info.klass();
312 intptr_t field_offset = info.field_offset();
313 return init_field_MemberName(mname_oop, field_holder(),
314 info.access_flags(),
315 type, name,
316 field_offset, false /*is_setter*/);
317 #endif
318 }
319
320
321 // JVM 2.9 Special Methods:
322 // A method is signature polymorphic if and only if all of the following conditions hold :
323 // * It is declared in the java.lang.invoke.MethodHandle class.
324 // * It has a single formal parameter of type Object[].
325 // * It has a return type of Object.
326 // * It has the ACC_VARARGS and ACC_NATIVE flags set.
327 bool MethodHandles::is_method_handle_invoke_name(Klass* klass, Symbol* name) {
328 if (klass == NULL)
329 return false;
330 // The following test will fail spuriously during bootstrap of MethodHandle itself:
331 // if (klass != SystemDictionary::MethodHandle_klass())
332 // Test the name instead:
333 if (klass->name() != vmSymbols::java_lang_invoke_MethodHandle())
334 return false;
335 Symbol* poly_sig = vmSymbols::object_array_object_signature();
336 Method* m = InstanceKlass::cast(klass)->find_method(name, poly_sig);
337 if (m == NULL) return false;
338 int required = JVM_ACC_NATIVE | JVM_ACC_VARARGS;
339 int flags = m->access_flags().as_int();
340 return (flags & required) == required;
556 break;
557 }
558 }
559 // Switch break goes here to take care of array suffix:
560 if (prev_type) {
561 while (array > 0) {
562 st->print("[]");
563 --array;
564 }
565 }
566 array = 0;
567 }
568 }
569
570
571
572 static oop object_java_mirror() {
573 return SystemDictionary::Object_klass()->java_mirror();
574 }
575
576 static oop field_name_or_null(Symbol* s) {
577 if (s == NULL) return NULL;
578 return StringTable::lookup(s);
579 }
580
581 static oop field_signature_type_or_null(Symbol* s) {
582 if (s == NULL) return NULL;
583 BasicType bt = FieldType::basic_type(s);
584 if (is_java_primitive(bt)) {
585 assert(s->utf8_length() == 1, "");
586 return java_lang_Class::primitive_mirror(bt);
587 }
588 // Here are some more short cuts for common types.
589 // They are optional, since reference types can be resolved lazily.
590 if (bt == T_OBJECT) {
591 if (s == vmSymbols::object_signature()) {
592 return object_java_mirror();
593 } else if (s == vmSymbols::class_signature()) {
594 return SystemDictionary::Class_klass()->java_mirror();
595 } else if (s == vmSymbols::string_signature()) {
596 return SystemDictionary::String_klass()->java_mirror();
597 }
598 }
599 return NULL;
600 }
601
684 } else if (ref_kind == JVM_REF_invokeInterface) {
685 LinkResolver::resolve_interface_call(result, Handle(), defc,
686 defc, name, type, KlassHandle(), false, false, THREAD);
687 } else if (mh_invoke_id != vmIntrinsics::_none) {
688 assert(!is_signature_polymorphic_static(mh_invoke_id), "");
689 LinkResolver::resolve_handle_call(result,
690 defc, name, type, KlassHandle(), THREAD);
691 } else if (ref_kind == JVM_REF_invokeSpecial) {
692 LinkResolver::resolve_special_call(result,
693 defc, name, type, KlassHandle(), false, THREAD);
694 } else if (ref_kind == JVM_REF_invokeVirtual) {
695 LinkResolver::resolve_virtual_call(result, Handle(), defc,
696 defc, name, type, KlassHandle(), false, false, THREAD);
697 } else {
698 assert(false, err_msg("ref_kind=%d", ref_kind));
699 }
700 if (HAS_PENDING_EXCEPTION) {
701 return empty;
702 }
703 }
704 return init_method_MemberName(mname, result, THREAD);
705 }
706 case IS_CONSTRUCTOR:
707 {
708 CallInfo result;
709 {
710 assert(!HAS_PENDING_EXCEPTION, "");
711 if (name == vmSymbols::object_initializer_name()) {
712 LinkResolver::resolve_special_call(result,
713 defc, name, type, KlassHandle(), false, THREAD);
714 } else {
715 break; // will throw after end of switch
716 }
717 if (HAS_PENDING_EXCEPTION) {
718 return empty;
719 }
720 }
721 assert(result.is_statically_bound(), "");
722 return init_method_MemberName(mname, result, THREAD);
723 }
724 case IS_FIELD:
725 {
726 // This is taken from LinkResolver::resolve_field, sans access checks.
727 fieldDescriptor fd; // find_field initializes fd if found
728 KlassHandle sel_klass(THREAD, InstanceKlass::cast(defc())->find_field(name, type, &fd));
729 // check if field exists; i.e., if a klass containing the field def has been selected
730 if (sel_klass.is_null()) return empty; // should not happen
731 oop type = field_signature_type_or_null(fd.signature());
732 oop name = field_name_or_null(fd.name());
733 bool is_setter = (ref_kind_is_valid(ref_kind) && ref_kind_is_setter(ref_kind));
734 mname = Handle(THREAD,
735 init_field_MemberName(mname, sel_klass,
736 fd.access_flags(), type, name, fd.offset(), is_setter));
737 return mname;
738 }
739 default:
740 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format", empty);
741 }
742
743 return empty;
744 }
745
746 // Conversely, a member name which is only initialized from JVM internals
747 // may have null defc, name, and type fields.
748 // Resolving it plants a vmtarget/vmindex in it,
749 // which refers directly to JVM internals.
750 void MethodHandles::expand_MemberName(Handle mname, int suppress, TRAPS) {
751 assert(java_lang_invoke_MemberName::is_instance(mname()), "");
752 Metadata* vmtarget = java_lang_invoke_MemberName::vmtarget(mname());
753 int vmindex = java_lang_invoke_MemberName::vmindex(mname());
754 if (vmtarget == NULL) {
755 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to expand");
756 }
757
776 methodHandle m(THREAD, (Method*)vmtarget);
777 DEBUG_ONLY(vmtarget = NULL); // safety
778 if (m.is_null()) break;
779 if (!have_defc) {
780 InstanceKlass* defc = m->method_holder();
781 java_lang_invoke_MemberName::set_clazz(mname(), defc->java_mirror());
782 }
783 if (!have_name) {
784 //not java_lang_String::create_from_symbol; let's intern member names
785 Handle name = StringTable::intern(m->name(), CHECK);
786 java_lang_invoke_MemberName::set_name(mname(), name());
787 }
788 if (!have_type) {
789 Handle type = java_lang_String::create_from_symbol(m->signature(), CHECK);
790 java_lang_invoke_MemberName::set_type(mname(), type());
791 }
792 return;
793 }
794 case IS_FIELD:
795 {
796 // This is taken from LinkResolver::resolve_field, sans access checks.
797 assert(vmtarget->is_klass(), "field vmtarget is Klass*");
798 if (!((Klass*) vmtarget)->oop_is_instance()) break;
799 instanceKlassHandle defc(THREAD, (Klass*) vmtarget);
800 DEBUG_ONLY(vmtarget = NULL); // safety
801 bool is_static = ((flags & JVM_ACC_STATIC) != 0);
802 fieldDescriptor fd; // find_field initializes fd if found
803 if (!defc->find_field_from_offset(vmindex, is_static, &fd))
804 break; // cannot expand
805 if (!have_defc) {
806 java_lang_invoke_MemberName::set_clazz(mname(), defc->java_mirror());
807 }
808 if (!have_name) {
809 //not java_lang_String::create_from_symbol; let's intern member names
810 Handle name = StringTable::intern(fd.name(), CHECK);
811 java_lang_invoke_MemberName::set_name(mname(), name());
812 }
813 if (!have_type) {
814 // If it is a primitive field type, don't mess with short strings like "I".
815 Handle type = field_signature_type_or_null(fd.signature());
816 if (type.is_null()) {
855 match_flags &= ~(IS_CONSTRUCTOR | IS_METHOD);
856 }
857
858 if ((match_flags & IS_TYPE) != 0) {
859 // NYI, and Core Reflection works quite well for this query
860 }
861
862 if ((match_flags & IS_FIELD) != 0) {
863 for (FieldStream st(k(), local_only, !search_intfc); !st.eos(); st.next()) {
864 if (name != NULL && st.name() != name)
865 continue;
866 if (sig != NULL && st.signature() != sig)
867 continue;
868 // passed the filters
869 if (rskip > 0) {
870 --rskip;
871 } else if (rfill < rlimit) {
872 Handle result(thread, results->obj_at(rfill++));
873 if (!java_lang_invoke_MemberName::is_instance(result()))
874 return -99; // caller bug!
875 oop type = field_signature_type_or_null(st.signature());
876 oop name = field_name_or_null(st.name());
877 oop saved = MethodHandles::init_field_MemberName(result, st.klass(),
878 st.access_flags(), type, name,
879 st.offset());
880 if (saved != result())
881 results->obj_at_put(rfill-1, saved); // show saved instance to user
882 } else if (++overflow >= overflow_limit) {
883 match_flags = 0; break; // got tired of looking at overflow
884 }
885 }
886 }
887
888 if ((match_flags & (IS_METHOD | IS_CONSTRUCTOR)) != 0) {
889 // watch out for these guys:
890 Symbol* init_name = vmSymbols::object_initializer_name();
891 Symbol* clinit_name = vmSymbols::class_initializer_name();
892 if (name == clinit_name) clinit_name = NULL; // hack for exposing <clinit>
893 bool negate_name_test = false;
894 // fix name so that it captures the intention of IS_CONSTRUCTOR
895 if (!(match_flags & IS_METHOD)) {
896 // constructors only
897 if (name == NULL) {
898 name = init_name;
899 } else if (name != init_name) {
909 }
910 } else {
911 // caller will accept either sort; no need to adjust name
912 }
913 for (MethodStream st(k(), local_only, !search_intfc); !st.eos(); st.next()) {
914 Method* m = st.method();
915 Symbol* m_name = m->name();
916 if (m_name == clinit_name)
917 continue;
918 if (name != NULL && ((m_name != name) ^ negate_name_test))
919 continue;
920 if (sig != NULL && m->signature() != sig)
921 continue;
922 // passed the filters
923 if (rskip > 0) {
924 --rskip;
925 } else if (rfill < rlimit) {
926 Handle result(thread, results->obj_at(rfill++));
927 if (!java_lang_invoke_MemberName::is_instance(result()))
928 return -99; // caller bug!
929 oop saved = MethodHandles::init_method_MemberName(result, m, true, NULL);
930 if (saved != result())
931 results->obj_at_put(rfill-1, saved); // show saved instance to user
932 } else if (++overflow >= overflow_limit) {
933 match_flags = 0; break; // got tired of looking at overflow
934 }
935 }
936 }
937
938 // return number of elements we at leasted wanted to initialize
939 return rfill + overflow;
940 }
941
942 //------------------------------------------------------------------------------
943 // MemberNameTable
944 //
945
946 MemberNameTable::MemberNameTable(int methods_cnt)
947 : GrowableArray<jweak>(methods_cnt, true) {
948 assert_locked_or_safepoint(MemberNameTable_lock);
949 }
1210 return JNIHandles::make_local(THREAD, clazz);
1211 }
1212 JVM_END
1213
1214 JVM_ENTRY(jobject, MHN_getMemberVMInfo(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1215 if (mname_jh == NULL) return NULL;
1216 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1217 intptr_t vmindex = java_lang_invoke_MemberName::vmindex(mname());
1218 Metadata* vmtarget = java_lang_invoke_MemberName::vmtarget(mname());
1219 objArrayHandle result = oopFactory::new_objArray(SystemDictionary::Object_klass(), 2, CHECK_NULL);
1220 jvalue vmindex_value; vmindex_value.j = (long)vmindex;
1221 oop x = java_lang_boxing_object::create(T_LONG, &vmindex_value, CHECK_NULL);
1222 result->obj_at_put(0, x);
1223 x = NULL;
1224 if (vmtarget == NULL) {
1225 x = NULL;
1226 } else if (vmtarget->is_klass()) {
1227 x = ((Klass*) vmtarget)->java_mirror();
1228 } else if (vmtarget->is_method()) {
1229 Handle mname2 = MethodHandles::new_MemberName(CHECK_NULL);
1230 x = MethodHandles::init_method_MemberName(mname2, (Method*)vmtarget, false, NULL);
1231 }
1232 result->obj_at_put(1, x);
1233 return JNIHandles::make_local(env, result());
1234 }
1235 JVM_END
1236
1237
1238
1239 // static native int getMembers(Class<?> defc, String matchName, String matchSig,
1240 // int matchFlags, Class<?> caller, int skip, MemberName[] results);
1241 JVM_ENTRY(jint, MHN_getMembers(JNIEnv *env, jobject igcls,
1242 jclass clazz_jh, jstring name_jh, jstring sig_jh,
1243 int mflags, jclass caller_jh, jint skip, jobjectArray results_jh)) {
1244 if (clazz_jh == NULL || results_jh == NULL) return -1;
1245 KlassHandle k(THREAD, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(clazz_jh)));
1246
1247 objArrayHandle results(THREAD, (objArrayOop) JNIHandles::resolve(results_jh));
1248 if (results.is_null() || !results->is_objArray()) return -1;
1249
1250 TempNewSymbol name = NULL;
|
110 IS_METHOD = java_lang_invoke_MemberName::MN_IS_METHOD,
111 IS_CONSTRUCTOR = java_lang_invoke_MemberName::MN_IS_CONSTRUCTOR,
112 IS_FIELD = java_lang_invoke_MemberName::MN_IS_FIELD,
113 IS_TYPE = java_lang_invoke_MemberName::MN_IS_TYPE,
114 CALLER_SENSITIVE = java_lang_invoke_MemberName::MN_CALLER_SENSITIVE,
115 REFERENCE_KIND_SHIFT = java_lang_invoke_MemberName::MN_REFERENCE_KIND_SHIFT,
116 REFERENCE_KIND_MASK = java_lang_invoke_MemberName::MN_REFERENCE_KIND_MASK,
117 SEARCH_SUPERCLASSES = java_lang_invoke_MemberName::MN_SEARCH_SUPERCLASSES,
118 SEARCH_INTERFACES = java_lang_invoke_MemberName::MN_SEARCH_INTERFACES,
119 ALL_KINDS = IS_METHOD | IS_CONSTRUCTOR | IS_FIELD | IS_TYPE
120 };
121
122 Handle MethodHandles::new_MemberName(TRAPS) {
123 Handle empty;
124 instanceKlassHandle k(THREAD, SystemDictionary::MemberName_klass());
125 if (!k->is_initialized()) k->initialize(CHECK_(empty));
126 return Handle(THREAD, k->allocate_instance(THREAD));
127 }
128
129 oop MethodHandles::init_MemberName(Handle mname, Handle target) {
130 // This method is used from java.lang.invoke.MemberName constructors.
131 // It fills in the new MemberName from a java.lang.reflect.Member.
132 Thread* thread = Thread::current();
133 oop target_oop = target();
134 Klass* target_klass = target_oop->klass();
135 if (target_klass == SystemDictionary::reflect_Field_klass()) {
136 oop clazz = java_lang_reflect_Field::clazz(target_oop); // fd.field_holder()
137 int slot = java_lang_reflect_Field::slot(target_oop); // fd.index()
138 KlassHandle k(thread, java_lang_Class::as_Klass(clazz));
139 if (!k.is_null() && k->oop_is_instance()) {
140 fieldDescriptor fd(InstanceKlass::cast(k()), slot);
141 oop mname2 = init_field_MemberName(mname, fd);
142 if (mname2 != NULL) {
143 // Since we have the reified name and type handy, add them to the result.
144 if (java_lang_invoke_MemberName::name(mname2) == NULL)
145 java_lang_invoke_MemberName::set_name(mname2, java_lang_reflect_Field::name(target_oop));
146 if (java_lang_invoke_MemberName::type(mname2) == NULL)
147 java_lang_invoke_MemberName::set_type(mname2, java_lang_reflect_Field::type(target_oop));
148 }
149 return mname2;
150 }
151 } else if (target_klass == SystemDictionary::reflect_Method_klass()) {
152 oop clazz = java_lang_reflect_Method::clazz(target_oop);
153 int slot = java_lang_reflect_Method::slot(target_oop);
154 KlassHandle k(thread, java_lang_Class::as_Klass(clazz));
155 if (!k.is_null() && k->oop_is_instance()) {
156 Method* m = InstanceKlass::cast(k())->method_with_idnum(slot);
157 if (m == NULL || is_signature_polymorphic(m->intrinsic_id()))
158 return NULL; // do not resolve unless there is a concrete signature
159 CallInfo info(m, k());
160 return init_method_MemberName(mname, info);
161 }
162 } else if (target_klass == SystemDictionary::reflect_Constructor_klass()) {
163 oop clazz = java_lang_reflect_Constructor::clazz(target_oop);
164 int slot = java_lang_reflect_Constructor::slot(target_oop);
165 KlassHandle k(thread, java_lang_Class::as_Klass(clazz));
166 if (!k.is_null() && k->oop_is_instance()) {
167 Method* m = InstanceKlass::cast(k())->method_with_idnum(slot);
168 if (m == NULL) return NULL;
169 CallInfo info(m, k());
170 return init_method_MemberName(mname, info);
171 }
172 }
173 return NULL;
174 }
175
176 oop MethodHandles::init_method_MemberName(Handle mname, CallInfo& info) {
177 assert(info.resolved_appendix().is_null(), "only normal methods here");
178 KlassHandle receiver_limit = info.resolved_klass();
179 methodHandle m = info.resolved_method();
180 int flags = (jushort)( m->access_flags().as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS );
181 int vmindex = Method::invalid_vtable_index;
182
183 switch (info.call_kind()) {
184 case CallInfo::itable_call:
185 vmindex = info.itable_index();
186 // More importantly, the itable index only works with the method holder.
187 receiver_limit = m->method_holder();
188 assert(receiver_limit->verify_itable_index(vmindex), "");
189 flags |= IS_METHOD | (JVM_REF_invokeInterface << REFERENCE_KIND_SHIFT);
190 break;
191
192 case CallInfo::vtable_call:
193 vmindex = info.vtable_index();
194 flags |= IS_METHOD | (JVM_REF_invokeVirtual << REFERENCE_KIND_SHIFT);
195 assert(receiver_limit->is_subtype_of(m->method_holder()), "virtual call must be type-safe");
196 break;
197
198 case CallInfo::direct_call:
199 vmindex = Method::nonvirtual_vtable_index;
200 if (m->is_static()) {
201 flags |= IS_METHOD | (JVM_REF_invokeStatic << REFERENCE_KIND_SHIFT);
202 } else if (m->is_initializer()) {
203 flags |= IS_CONSTRUCTOR | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT);
204 assert(receiver_limit == m->method_holder(), "constructor call must be exactly typed");
205 } else {
206 flags |= IS_METHOD | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT);
207 assert(receiver_limit->is_subtype_of(m->method_holder()), "special call must be type-safe");
208 }
209 break;
210
211 default: assert(false, "bad CallInfo"); return NULL;
212 }
213
214 // @CallerSensitive annotation detected
215 if (m->caller_sensitive()) {
216 flags |= CALLER_SENSITIVE;
217 }
218
219 oop mname_oop = mname();
220 java_lang_invoke_MemberName::set_flags( mname_oop, flags);
221 java_lang_invoke_MemberName::set_vmtarget(mname_oop, m());
222 java_lang_invoke_MemberName::set_vmindex( mname_oop, vmindex); // vtable/itable index
223 java_lang_invoke_MemberName::set_clazz( mname_oop, receiver_limit->java_mirror());
224 // Note: name and type can be lazily computed by resolve_MemberName,
225 // if Java code needs them as resolved String and MethodType objects.
226 // The clazz must be eagerly stored, because it provides a GC
227 // root to help keep alive the Method*.
228 // If relevant, the vtable or itable value is stored as vmindex.
229 // This is done eagerly, since it is readily available without
230 // constructing any new objects.
231 // TO DO: maybe intern mname_oop
232 m->method_holder()->add_member_name(m->method_idnum(), mname);
233
234 return mname();
235 }
236
237 oop MethodHandles::init_field_MemberName(Handle mname, fieldDescriptor& fd, bool is_setter) {
238 int flags = (jushort)( fd.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS );
239 flags |= IS_FIELD | ((fd.is_static() ? JVM_REF_getStatic : JVM_REF_getField) << REFERENCE_KIND_SHIFT);
240 if (is_setter) flags += ((JVM_REF_putField - JVM_REF_getField) << REFERENCE_KIND_SHIFT);
241 Metadata* vmtarget = fd.field_holder();
242 int vmindex = fd.offset(); // determines the field uniquely when combined with static bit
243 oop mname_oop = mname();
244 java_lang_invoke_MemberName::set_flags(mname_oop, flags);
245 java_lang_invoke_MemberName::set_vmtarget(mname_oop, vmtarget);
246 java_lang_invoke_MemberName::set_vmindex(mname_oop, vmindex);
247 java_lang_invoke_MemberName::set_clazz(mname_oop, fd.field_holder()->java_mirror());
248 oop type = field_signature_type_or_null(fd.signature());
249 oop name = field_name_or_null(fd.name());
250 if (name != NULL)
251 java_lang_invoke_MemberName::set_name(mname_oop, name);
252 if (type != NULL)
253 java_lang_invoke_MemberName::set_type(mname_oop, type);
254 // Note: name and type can be lazily computed by resolve_MemberName,
255 // if Java code needs them as resolved String and Class objects.
256 // Note that the incoming type oop might be pre-resolved (non-null).
257 // The base clazz and field offset (vmindex) must be eagerly stored,
258 // because they unambiguously identify the field.
259 // Although the fieldDescriptor::_index would also identify the field,
260 // we do not use it, because it is harder to decode.
261 // TO DO: maybe intern mname_oop
262 return mname();
263 }
264
265 // JVM 2.9 Special Methods:
266 // A method is signature polymorphic if and only if all of the following conditions hold :
267 // * It is declared in the java.lang.invoke.MethodHandle class.
268 // * It has a single formal parameter of type Object[].
269 // * It has a return type of Object.
270 // * It has the ACC_VARARGS and ACC_NATIVE flags set.
271 bool MethodHandles::is_method_handle_invoke_name(Klass* klass, Symbol* name) {
272 if (klass == NULL)
273 return false;
274 // The following test will fail spuriously during bootstrap of MethodHandle itself:
275 // if (klass != SystemDictionary::MethodHandle_klass())
276 // Test the name instead:
277 if (klass->name() != vmSymbols::java_lang_invoke_MethodHandle())
278 return false;
279 Symbol* poly_sig = vmSymbols::object_array_object_signature();
280 Method* m = InstanceKlass::cast(klass)->find_method(name, poly_sig);
281 if (m == NULL) return false;
282 int required = JVM_ACC_NATIVE | JVM_ACC_VARARGS;
283 int flags = m->access_flags().as_int();
284 return (flags & required) == required;
500 break;
501 }
502 }
503 // Switch break goes here to take care of array suffix:
504 if (prev_type) {
505 while (array > 0) {
506 st->print("[]");
507 --array;
508 }
509 }
510 array = 0;
511 }
512 }
513
514
515
516 static oop object_java_mirror() {
517 return SystemDictionary::Object_klass()->java_mirror();
518 }
519
520 oop MethodHandles::field_name_or_null(Symbol* s) {
521 if (s == NULL) return NULL;
522 return StringTable::lookup(s);
523 }
524
525 oop MethodHandles::field_signature_type_or_null(Symbol* s) {
526 if (s == NULL) return NULL;
527 BasicType bt = FieldType::basic_type(s);
528 if (is_java_primitive(bt)) {
529 assert(s->utf8_length() == 1, "");
530 return java_lang_Class::primitive_mirror(bt);
531 }
532 // Here are some more short cuts for common types.
533 // They are optional, since reference types can be resolved lazily.
534 if (bt == T_OBJECT) {
535 if (s == vmSymbols::object_signature()) {
536 return object_java_mirror();
537 } else if (s == vmSymbols::class_signature()) {
538 return SystemDictionary::Class_klass()->java_mirror();
539 } else if (s == vmSymbols::string_signature()) {
540 return SystemDictionary::String_klass()->java_mirror();
541 }
542 }
543 return NULL;
544 }
545
628 } else if (ref_kind == JVM_REF_invokeInterface) {
629 LinkResolver::resolve_interface_call(result, Handle(), defc,
630 defc, name, type, KlassHandle(), false, false, THREAD);
631 } else if (mh_invoke_id != vmIntrinsics::_none) {
632 assert(!is_signature_polymorphic_static(mh_invoke_id), "");
633 LinkResolver::resolve_handle_call(result,
634 defc, name, type, KlassHandle(), THREAD);
635 } else if (ref_kind == JVM_REF_invokeSpecial) {
636 LinkResolver::resolve_special_call(result,
637 defc, name, type, KlassHandle(), false, THREAD);
638 } else if (ref_kind == JVM_REF_invokeVirtual) {
639 LinkResolver::resolve_virtual_call(result, Handle(), defc,
640 defc, name, type, KlassHandle(), false, false, THREAD);
641 } else {
642 assert(false, err_msg("ref_kind=%d", ref_kind));
643 }
644 if (HAS_PENDING_EXCEPTION) {
645 return empty;
646 }
647 }
648 if (result.resolved_appendix().not_null()) {
649 // The resolved MemberName must not be accompanied by an appendix argument,
650 // since there is no way to bind this value into the MemberName.
651 // Caller is responsible to prevent this from happening.
652 THROW_MSG_(vmSymbols::java_lang_InternalError(), "appendix", empty);
653 }
654 oop mname2 = init_method_MemberName(mname, result);
655 return Handle(THREAD, mname2);
656 }
657 case IS_CONSTRUCTOR:
658 {
659 CallInfo result;
660 {
661 assert(!HAS_PENDING_EXCEPTION, "");
662 if (name == vmSymbols::object_initializer_name()) {
663 LinkResolver::resolve_special_call(result,
664 defc, name, type, KlassHandle(), false, THREAD);
665 } else {
666 break; // will throw after end of switch
667 }
668 if (HAS_PENDING_EXCEPTION) {
669 return empty;
670 }
671 }
672 assert(result.is_statically_bound(), "");
673 oop mname2 = init_method_MemberName(mname, result);
674 return Handle(THREAD, mname2);
675 }
676 case IS_FIELD:
677 {
678 fieldDescriptor result; // find_field initializes fd if found
679 {
680 assert(!HAS_PENDING_EXCEPTION, "");
681 LinkResolver::resolve_field(result, defc, name, type, KlassHandle(), Bytecodes::_nop, false, false, THREAD);
682 if (HAS_PENDING_EXCEPTION) {
683 return empty;
684 }
685 }
686 oop mname2 = init_field_MemberName(mname, result, ref_kind_is_setter(ref_kind));
687 return Handle(THREAD, mname2);
688 }
689 default:
690 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format", empty);
691 }
692
693 return empty;
694 }
695
696 // Conversely, a member name which is only initialized from JVM internals
697 // may have null defc, name, and type fields.
698 // Resolving it plants a vmtarget/vmindex in it,
699 // which refers directly to JVM internals.
700 void MethodHandles::expand_MemberName(Handle mname, int suppress, TRAPS) {
701 assert(java_lang_invoke_MemberName::is_instance(mname()), "");
702 Metadata* vmtarget = java_lang_invoke_MemberName::vmtarget(mname());
703 int vmindex = java_lang_invoke_MemberName::vmindex(mname());
704 if (vmtarget == NULL) {
705 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to expand");
706 }
707
726 methodHandle m(THREAD, (Method*)vmtarget);
727 DEBUG_ONLY(vmtarget = NULL); // safety
728 if (m.is_null()) break;
729 if (!have_defc) {
730 InstanceKlass* defc = m->method_holder();
731 java_lang_invoke_MemberName::set_clazz(mname(), defc->java_mirror());
732 }
733 if (!have_name) {
734 //not java_lang_String::create_from_symbol; let's intern member names
735 Handle name = StringTable::intern(m->name(), CHECK);
736 java_lang_invoke_MemberName::set_name(mname(), name());
737 }
738 if (!have_type) {
739 Handle type = java_lang_String::create_from_symbol(m->signature(), CHECK);
740 java_lang_invoke_MemberName::set_type(mname(), type());
741 }
742 return;
743 }
744 case IS_FIELD:
745 {
746 assert(vmtarget->is_klass(), "field vmtarget is Klass*");
747 if (!((Klass*) vmtarget)->oop_is_instance()) break;
748 instanceKlassHandle defc(THREAD, (Klass*) vmtarget);
749 DEBUG_ONLY(vmtarget = NULL); // safety
750 bool is_static = ((flags & JVM_ACC_STATIC) != 0);
751 fieldDescriptor fd; // find_field initializes fd if found
752 if (!defc->find_field_from_offset(vmindex, is_static, &fd))
753 break; // cannot expand
754 if (!have_defc) {
755 java_lang_invoke_MemberName::set_clazz(mname(), defc->java_mirror());
756 }
757 if (!have_name) {
758 //not java_lang_String::create_from_symbol; let's intern member names
759 Handle name = StringTable::intern(fd.name(), CHECK);
760 java_lang_invoke_MemberName::set_name(mname(), name());
761 }
762 if (!have_type) {
763 // If it is a primitive field type, don't mess with short strings like "I".
764 Handle type = field_signature_type_or_null(fd.signature());
765 if (type.is_null()) {
804 match_flags &= ~(IS_CONSTRUCTOR | IS_METHOD);
805 }
806
807 if ((match_flags & IS_TYPE) != 0) {
808 // NYI, and Core Reflection works quite well for this query
809 }
810
811 if ((match_flags & IS_FIELD) != 0) {
812 for (FieldStream st(k(), local_only, !search_intfc); !st.eos(); st.next()) {
813 if (name != NULL && st.name() != name)
814 continue;
815 if (sig != NULL && st.signature() != sig)
816 continue;
817 // passed the filters
818 if (rskip > 0) {
819 --rskip;
820 } else if (rfill < rlimit) {
821 Handle result(thread, results->obj_at(rfill++));
822 if (!java_lang_invoke_MemberName::is_instance(result()))
823 return -99; // caller bug!
824 oop saved = MethodHandles::init_field_MemberName(result, st.field_descriptor());
825 if (saved != result())
826 results->obj_at_put(rfill-1, saved); // show saved instance to user
827 } else if (++overflow >= overflow_limit) {
828 match_flags = 0; break; // got tired of looking at overflow
829 }
830 }
831 }
832
833 if ((match_flags & (IS_METHOD | IS_CONSTRUCTOR)) != 0) {
834 // watch out for these guys:
835 Symbol* init_name = vmSymbols::object_initializer_name();
836 Symbol* clinit_name = vmSymbols::class_initializer_name();
837 if (name == clinit_name) clinit_name = NULL; // hack for exposing <clinit>
838 bool negate_name_test = false;
839 // fix name so that it captures the intention of IS_CONSTRUCTOR
840 if (!(match_flags & IS_METHOD)) {
841 // constructors only
842 if (name == NULL) {
843 name = init_name;
844 } else if (name != init_name) {
854 }
855 } else {
856 // caller will accept either sort; no need to adjust name
857 }
858 for (MethodStream st(k(), local_only, !search_intfc); !st.eos(); st.next()) {
859 Method* m = st.method();
860 Symbol* m_name = m->name();
861 if (m_name == clinit_name)
862 continue;
863 if (name != NULL && ((m_name != name) ^ negate_name_test))
864 continue;
865 if (sig != NULL && m->signature() != sig)
866 continue;
867 // passed the filters
868 if (rskip > 0) {
869 --rskip;
870 } else if (rfill < rlimit) {
871 Handle result(thread, results->obj_at(rfill++));
872 if (!java_lang_invoke_MemberName::is_instance(result()))
873 return -99; // caller bug!
874 CallInfo info(m);
875 oop saved = MethodHandles::init_method_MemberName(result, info);
876 if (saved != result())
877 results->obj_at_put(rfill-1, saved); // show saved instance to user
878 } else if (++overflow >= overflow_limit) {
879 match_flags = 0; break; // got tired of looking at overflow
880 }
881 }
882 }
883
884 // return number of elements we at leasted wanted to initialize
885 return rfill + overflow;
886 }
887
888 //------------------------------------------------------------------------------
889 // MemberNameTable
890 //
891
892 MemberNameTable::MemberNameTable(int methods_cnt)
893 : GrowableArray<jweak>(methods_cnt, true) {
894 assert_locked_or_safepoint(MemberNameTable_lock);
895 }
1156 return JNIHandles::make_local(THREAD, clazz);
1157 }
1158 JVM_END
1159
1160 JVM_ENTRY(jobject, MHN_getMemberVMInfo(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1161 if (mname_jh == NULL) return NULL;
1162 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1163 intptr_t vmindex = java_lang_invoke_MemberName::vmindex(mname());
1164 Metadata* vmtarget = java_lang_invoke_MemberName::vmtarget(mname());
1165 objArrayHandle result = oopFactory::new_objArray(SystemDictionary::Object_klass(), 2, CHECK_NULL);
1166 jvalue vmindex_value; vmindex_value.j = (long)vmindex;
1167 oop x = java_lang_boxing_object::create(T_LONG, &vmindex_value, CHECK_NULL);
1168 result->obj_at_put(0, x);
1169 x = NULL;
1170 if (vmtarget == NULL) {
1171 x = NULL;
1172 } else if (vmtarget->is_klass()) {
1173 x = ((Klass*) vmtarget)->java_mirror();
1174 } else if (vmtarget->is_method()) {
1175 Handle mname2 = MethodHandles::new_MemberName(CHECK_NULL);
1176 CallInfo info((Method*)vmtarget);
1177 x = MethodHandles::init_method_MemberName(mname2, info);
1178 }
1179 result->obj_at_put(1, x);
1180 return JNIHandles::make_local(env, result());
1181 }
1182 JVM_END
1183
1184
1185
1186 // static native int getMembers(Class<?> defc, String matchName, String matchSig,
1187 // int matchFlags, Class<?> caller, int skip, MemberName[] results);
1188 JVM_ENTRY(jint, MHN_getMembers(JNIEnv *env, jobject igcls,
1189 jclass clazz_jh, jstring name_jh, jstring sig_jh,
1190 int mflags, jclass caller_jh, jint skip, jobjectArray results_jh)) {
1191 if (clazz_jh == NULL || results_jh == NULL) return -1;
1192 KlassHandle k(THREAD, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(clazz_jh)));
1193
1194 objArrayHandle results(THREAD, (objArrayOop) JNIHandles::resolve(results_jh));
1195 if (results.is_null() || !results->is_objArray()) return -1;
1196
1197 TempNewSymbol name = NULL;
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