162 switch (flags & ALL_KINDS) {
163 case IS_METHOD:
164 case IS_CONSTRUCTOR:
165 resolved = SystemDictionary::find_method_handle_type(signature, caller, CHECK_(empty));
166 break;
167 case IS_FIELD:
168 resolved = SystemDictionary::find_field_handle_type(signature, caller, CHECK_(empty));
169 break;
170 default:
171 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format", empty);
172 }
173 if (resolved.is_null()) {
174 THROW_MSG_(vmSymbols::java_lang_InternalError(), "bad MemberName type", empty);
175 }
176 return resolved;
177 }
178
179 oop MethodHandles::init_MemberName(Handle mname, Handle target, TRAPS) {
180 // This method is used from java.lang.invoke.MemberName constructors.
181 // It fills in the new MemberName from a java.lang.reflect.Member.
182 Thread* thread = Thread::current();
183 oop target_oop = target();
184 Klass* target_klass = target_oop->klass();
185 if (target_klass == SystemDictionary::reflect_Field_klass()) {
186 oop clazz = java_lang_reflect_Field::clazz(target_oop); // fd.field_holder()
187 int slot = java_lang_reflect_Field::slot(target_oop); // fd.index()
188 Klass* k = java_lang_Class::as_Klass(clazz);
189 if (k != NULL && k->is_instance_klass()) {
190 fieldDescriptor fd(InstanceKlass::cast(k), slot);
191 oop mname2 = init_field_MemberName(mname, fd);
192 if (mname2 != NULL) {
193 // Since we have the reified name and type handy, add them to the result.
194 if (java_lang_invoke_MemberName::name(mname2) == NULL)
195 java_lang_invoke_MemberName::set_name(mname2, java_lang_reflect_Field::name(target_oop));
196 if (java_lang_invoke_MemberName::type(mname2) == NULL)
197 java_lang_invoke_MemberName::set_type(mname2, java_lang_reflect_Field::type(target_oop));
198 }
199 return mname2;
200 }
201 } else if (target_klass == SystemDictionary::reflect_Method_klass()) {
202 oop clazz = java_lang_reflect_Method::clazz(target_oop);
203 int slot = java_lang_reflect_Method::slot(target_oop);
204 Klass* k = java_lang_Class::as_Klass(clazz);
205 if (k != NULL && k->is_instance_klass()) {
206 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot);
207 if (m == NULL || is_signature_polymorphic(m->intrinsic_id()))
208 return NULL; // do not resolve unless there is a concrete signature
209 CallInfo info(m, k, CHECK_NULL);
210 return init_method_MemberName(mname, info);
211 }
212 } else if (target_klass == SystemDictionary::reflect_Constructor_klass()) {
213 oop clazz = java_lang_reflect_Constructor::clazz(target_oop);
214 int slot = java_lang_reflect_Constructor::slot(target_oop);
215 Klass* k = java_lang_Class::as_Klass(clazz);
216 if (k != NULL && k->is_instance_klass()) {
217 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot);
218 if (m == NULL) return NULL;
219 CallInfo info(m, k, CHECK_NULL);
220 return init_method_MemberName(mname, info);
221 }
222 }
223 return NULL;
224 }
225
226 oop MethodHandles::init_method_MemberName(Handle mname, CallInfo& info) {
227 assert(info.resolved_appendix().is_null(), "only normal methods here");
228 methodHandle m(Thread::current(), info.resolved_method());
229 assert(m.not_null(), "null method handle");
230 InstanceKlass* m_klass = m->method_holder();
231 assert(m_klass != NULL, "null holder for method handle");
232 int flags = (jushort)( m->access_flags().as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS );
233 int vmindex = Method::invalid_vtable_index;
234 LogTarget(Debug, methodhandles, indy) lt_indy;
235
236 switch (info.call_kind()) {
237 case CallInfo::itable_call:
238 vmindex = info.itable_index();
239 // More importantly, the itable index only works with the method holder.
240 assert(m_klass->verify_itable_index(vmindex), "");
241 flags |= IS_METHOD | (JVM_REF_invokeInterface << REFERENCE_KIND_SHIFT);
242 if (lt_indy.is_enabled()) {
243 ResourceMark rm;
244 LogStream ls(lt_indy);
245 ls.print_cr("memberName: invokeinterface method_holder::method: %s, itableindex: %d, access_flags:",
246 Method::name_and_sig_as_C_string(m->method_holder(), m->name(), m->signature()),
772 } else if (ref_kind == JVM_REF_invokeVirtual) {
773 LinkResolver::resolve_virtual_call(result, Handle(), defc,
774 link_info, false, THREAD);
775 } else {
776 assert(false, "ref_kind=%d", ref_kind);
777 }
778 if (HAS_PENDING_EXCEPTION) {
779 if (speculative_resolve) {
780 CLEAR_PENDING_EXCEPTION;
781 }
782 return empty;
783 }
784 }
785 if (result.resolved_appendix().not_null()) {
786 // The resolved MemberName must not be accompanied by an appendix argument,
787 // since there is no way to bind this value into the MemberName.
788 // Caller is responsible to prevent this from happening.
789 THROW_MSG_(vmSymbols::java_lang_InternalError(), "appendix", empty);
790 }
791 result.set_resolved_method_name(CHECK_(empty));
792 oop mname2 = init_method_MemberName(mname, result);
793 return Handle(THREAD, mname2);
794 }
795 case IS_CONSTRUCTOR:
796 {
797 CallInfo result;
798 LinkInfo link_info(defc, name, type, caller, access_check);
799 {
800 assert(!HAS_PENDING_EXCEPTION, "");
801 if (name == vmSymbols::object_initializer_name()) {
802 LinkResolver::resolve_special_call(result, Handle(), link_info, THREAD);
803 } else {
804 break; // will throw after end of switch
805 }
806 if (HAS_PENDING_EXCEPTION) {
807 if (speculative_resolve) {
808 CLEAR_PENDING_EXCEPTION;
809 }
810 return empty;
811 }
812 }
813 assert(result.is_statically_bound(), "");
814 result.set_resolved_method_name(CHECK_(empty));
815 oop mname2 = init_method_MemberName(mname, result);
816 return Handle(THREAD, mname2);
817 }
818 case IS_FIELD:
819 {
820 fieldDescriptor result; // find_field initializes fd if found
821 {
822 assert(!HAS_PENDING_EXCEPTION, "");
823 LinkInfo link_info(defc, name, type, caller, LinkInfo::skip_access_check);
824 LinkResolver::resolve_field(result, link_info, Bytecodes::_nop, false, THREAD);
825 if (HAS_PENDING_EXCEPTION) {
826 if (speculative_resolve) {
827 CLEAR_PENDING_EXCEPTION;
828 }
829 return empty;
830 }
831 }
832 oop mname2 = init_field_MemberName(mname, result, ref_kind_is_setter(ref_kind));
833 return Handle(THREAD, mname2);
834 }
835 default:
905 if (!have_type) {
906 // If it is a primitive field type, don't mess with short strings like "I".
907 Handle type (THREAD, field_signature_type_or_null(fd.signature()));
908 if (type.is_null()) {
909 type = java_lang_String::create_from_symbol(fd.signature(), CHECK);
910 }
911 java_lang_invoke_MemberName::set_type(mname(), type());
912 }
913 return;
914 }
915 }
916 THROW_MSG(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format");
917 }
918
919 int MethodHandles::find_MemberNames(Klass* k,
920 Symbol* name, Symbol* sig,
921 int mflags, Klass* caller,
922 int skip, objArrayHandle results, TRAPS) {
923 // %%% take caller into account!
924
925 Thread* thread = Thread::current();
926
927 if (k == NULL || !k->is_instance_klass()) return -1;
928
929 int rfill = 0, rlimit = results->length(), rskip = skip;
930 // overflow measurement:
931 int overflow = 0, overflow_limit = MAX2(1000, rlimit);
932
933 int match_flags = mflags;
934 bool search_superc = ((match_flags & SEARCH_SUPERCLASSES) != 0);
935 bool search_intfc = ((match_flags & SEARCH_INTERFACES) != 0);
936 bool local_only = !(search_superc | search_intfc);
937
938 if (name != NULL) {
939 if (name->utf8_length() == 0) return 0; // a match is not possible
940 }
941 if (sig != NULL) {
942 if (sig->starts_with(JVM_SIGNATURE_FUNC))
943 match_flags &= ~(IS_FIELD | IS_TYPE);
944 else
945 match_flags &= ~(IS_CONSTRUCTOR | IS_METHOD);
946 }
947
948 if ((match_flags & IS_TYPE) != 0) {
949 // NYI, and Core Reflection works quite well for this query
950 }
951
952 if ((match_flags & IS_FIELD) != 0) {
953 InstanceKlass* ik = InstanceKlass::cast(k);
954 for (FieldStream st(ik, local_only, !search_intfc); !st.eos(); st.next()) {
955 if (name != NULL && st.name() != name)
956 continue;
957 if (sig != NULL && st.signature() != sig)
958 continue;
959 // passed the filters
960 if (rskip > 0) {
961 --rskip;
962 } else if (rfill < rlimit) {
963 Handle result(thread, results->obj_at(rfill++));
964 if (!java_lang_invoke_MemberName::is_instance(result()))
965 return -99; // caller bug!
966 oop saved = MethodHandles::init_field_MemberName(result, st.field_descriptor());
967 if (saved != result())
968 results->obj_at_put(rfill-1, saved); // show saved instance to user
969 } else if (++overflow >= overflow_limit) {
970 match_flags = 0; break; // got tired of looking at overflow
971 }
972 }
973 }
974
975 if ((match_flags & (IS_METHOD | IS_CONSTRUCTOR)) != 0) {
976 // watch out for these guys:
977 Symbol* init_name = vmSymbols::object_initializer_name();
978 Symbol* clinit_name = vmSymbols::class_initializer_name();
979 if (name == clinit_name) clinit_name = NULL; // hack for exposing <clinit>
980 bool negate_name_test = false;
981 // fix name so that it captures the intention of IS_CONSTRUCTOR
982 if (!(match_flags & IS_METHOD)) {
983 // constructors only
994 } else if (name == init_name) {
995 return 0; // no methods of this constructor name
996 }
997 } else {
998 // caller will accept either sort; no need to adjust name
999 }
1000 InstanceKlass* ik = InstanceKlass::cast(k);
1001 for (MethodStream st(ik, local_only, !search_intfc); !st.eos(); st.next()) {
1002 Method* m = st.method();
1003 Symbol* m_name = m->name();
1004 if (m_name == clinit_name)
1005 continue;
1006 if (name != NULL && ((m_name != name) ^ negate_name_test))
1007 continue;
1008 if (sig != NULL && m->signature() != sig)
1009 continue;
1010 // passed the filters
1011 if (rskip > 0) {
1012 --rskip;
1013 } else if (rfill < rlimit) {
1014 Handle result(thread, results->obj_at(rfill++));
1015 if (!java_lang_invoke_MemberName::is_instance(result()))
1016 return -99; // caller bug!
1017 CallInfo info(m, NULL, CHECK_0);
1018 oop saved = MethodHandles::init_method_MemberName(result, info);
1019 if (saved != result())
1020 results->obj_at_put(rfill-1, saved); // show saved instance to user
1021 } else if (++overflow >= overflow_limit) {
1022 match_flags = 0; break; // got tired of looking at overflow
1023 }
1024 }
1025 }
1026
1027 // return number of elements we at leasted wanted to initialize
1028 return rfill + overflow;
1029 }
1030
1031 void MethodHandles::add_dependent_nmethod(oop call_site, nmethod* nm) {
1032 assert_locked_or_safepoint(CodeCache_lock);
1033
1034 oop context = java_lang_invoke_CallSite::context_no_keepalive(call_site);
1035 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context);
1036 // Try to purge stale entries on updates.
1037 // Since GC doesn't clean dependency contexts rooted at CallSiteContext objects,
1038 // in order to avoid memory leak, stale entries are purged whenever a dependency list
1285 JVM_END
1286
1287 JVM_ENTRY(jobject, MHN_getMemberVMInfo(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1288 if (mname_jh == NULL) return NULL;
1289 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1290 intptr_t vmindex = java_lang_invoke_MemberName::vmindex(mname());
1291 objArrayHandle result = oopFactory::new_objArray_handle(SystemDictionary::Object_klass(), 2, CHECK_NULL);
1292 jvalue vmindex_value; vmindex_value.j = (long)vmindex;
1293 oop x = java_lang_boxing_object::create(T_LONG, &vmindex_value, CHECK_NULL);
1294 result->obj_at_put(0, x);
1295
1296 int flags = java_lang_invoke_MemberName::flags(mname());
1297 if ((flags & IS_FIELD) != 0) {
1298 x = java_lang_invoke_MemberName::clazz(mname());
1299 } else {
1300 Method* vmtarget = java_lang_invoke_MemberName::vmtarget(mname());
1301 assert(vmtarget != NULL && vmtarget->is_method(), "vmtarget is only method");
1302 x = mname();
1303 }
1304 result->obj_at_put(1, x);
1305 return JNIHandles::make_local(env, result());
1306 }
1307 JVM_END
1308
1309
1310
1311 // static native int getMembers(Class<?> defc, String matchName, String matchSig,
1312 // int matchFlags, Class<?> caller, int skip, MemberName[] results);
1313 JVM_ENTRY(jint, MHN_getMembers(JNIEnv *env, jobject igcls,
1314 jclass clazz_jh, jstring name_jh, jstring sig_jh,
1315 int mflags, jclass caller_jh, jint skip, jobjectArray results_jh)) {
1316 if (clazz_jh == NULL || results_jh == NULL) return -1;
1317 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(clazz_jh));
1318
1319 objArrayHandle results(THREAD, (objArrayOop) JNIHandles::resolve(results_jh));
1320 if (results.is_null() || !results->is_objArray()) return -1;
1321
1322 TempNewSymbol name = NULL;
1323 TempNewSymbol sig = NULL;
1324 if (name_jh != NULL) {
1325 name = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(name_jh));
1533 {CC "clearCallSiteContext", CC "(" CTX ")V", FN_PTR(MHN_clearCallSiteContext)},
1534 {CC "staticFieldOffset", CC "(" MEM ")J", FN_PTR(MHN_staticFieldOffset)},
1535 {CC "staticFieldBase", CC "(" MEM ")" OBJ, FN_PTR(MHN_staticFieldBase)},
1536 {CC "getMemberVMInfo", CC "(" MEM ")" OBJ, FN_PTR(MHN_getMemberVMInfo)}
1537 };
1538
1539 static JNINativeMethod MH_methods[] = {
1540 // UnsupportedOperationException throwers
1541 {CC "invoke", CC "([" OBJ ")" OBJ, FN_PTR(MH_invoke_UOE)},
1542 {CC "invokeExact", CC "([" OBJ ")" OBJ, FN_PTR(MH_invokeExact_UOE)}
1543 };
1544
1545 /**
1546 * This one function is exported, used by NativeLookup.
1547 */
1548 JVM_ENTRY(void, JVM_RegisterMethodHandleMethods(JNIEnv *env, jclass MHN_class)) {
1549 assert(!MethodHandles::enabled(), "must not be enabled");
1550 assert(SystemDictionary::MethodHandle_klass() != NULL, "should be present");
1551
1552 oop mirror = SystemDictionary::MethodHandle_klass()->java_mirror();
1553 jclass MH_class = (jclass) JNIHandles::make_local(env, mirror);
1554
1555 {
1556 ThreadToNativeFromVM ttnfv(thread);
1557
1558 int status = env->RegisterNatives(MHN_class, MHN_methods, sizeof(MHN_methods)/sizeof(JNINativeMethod));
1559 guarantee(status == JNI_OK && !env->ExceptionOccurred(),
1560 "register java.lang.invoke.MethodHandleNative natives");
1561
1562 status = env->RegisterNatives(MH_class, MH_methods, sizeof(MH_methods)/sizeof(JNINativeMethod));
1563 guarantee(status == JNI_OK && !env->ExceptionOccurred(),
1564 "register java.lang.invoke.MethodHandle natives");
1565 }
1566
1567 log_debug(methodhandles, indy)("MethodHandle support loaded (using LambdaForms)");
1568
1569 MethodHandles::set_enabled(true);
1570 }
1571 JVM_END
|
162 switch (flags & ALL_KINDS) {
163 case IS_METHOD:
164 case IS_CONSTRUCTOR:
165 resolved = SystemDictionary::find_method_handle_type(signature, caller, CHECK_(empty));
166 break;
167 case IS_FIELD:
168 resolved = SystemDictionary::find_field_handle_type(signature, caller, CHECK_(empty));
169 break;
170 default:
171 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format", empty);
172 }
173 if (resolved.is_null()) {
174 THROW_MSG_(vmSymbols::java_lang_InternalError(), "bad MemberName type", empty);
175 }
176 return resolved;
177 }
178
179 oop MethodHandles::init_MemberName(Handle mname, Handle target, TRAPS) {
180 // This method is used from java.lang.invoke.MemberName constructors.
181 // It fills in the new MemberName from a java.lang.reflect.Member.
182 oop target_oop = target();
183 Klass* target_klass = target_oop->klass();
184 if (target_klass == SystemDictionary::reflect_Field_klass()) {
185 oop clazz = java_lang_reflect_Field::clazz(target_oop); // fd.field_holder()
186 int slot = java_lang_reflect_Field::slot(target_oop); // fd.index()
187 Klass* k = java_lang_Class::as_Klass(clazz);
188 if (k != NULL && k->is_instance_klass()) {
189 fieldDescriptor fd(InstanceKlass::cast(k), slot);
190 oop mname2 = init_field_MemberName(mname, fd);
191 if (mname2 != NULL) {
192 // Since we have the reified name and type handy, add them to the result.
193 if (java_lang_invoke_MemberName::name(mname2) == NULL)
194 java_lang_invoke_MemberName::set_name(mname2, java_lang_reflect_Field::name(target_oop));
195 if (java_lang_invoke_MemberName::type(mname2) == NULL)
196 java_lang_invoke_MemberName::set_type(mname2, java_lang_reflect_Field::type(target_oop));
197 }
198 return mname2;
199 }
200 } else if (target_klass == SystemDictionary::reflect_Method_klass()) {
201 oop clazz = java_lang_reflect_Method::clazz(target_oop);
202 int slot = java_lang_reflect_Method::slot(target_oop);
203 Klass* k = java_lang_Class::as_Klass(clazz);
204 if (k != NULL && k->is_instance_klass()) {
205 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot);
206 if (m == NULL || is_signature_polymorphic(m->intrinsic_id()))
207 return NULL; // do not resolve unless there is a concrete signature
208 CallInfo info(m, k, CHECK_NULL);
209 return init_method_MemberName(mname, info, THREAD);
210 }
211 } else if (target_klass == SystemDictionary::reflect_Constructor_klass()) {
212 oop clazz = java_lang_reflect_Constructor::clazz(target_oop);
213 int slot = java_lang_reflect_Constructor::slot(target_oop);
214 Klass* k = java_lang_Class::as_Klass(clazz);
215 if (k != NULL && k->is_instance_klass()) {
216 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot);
217 if (m == NULL) return NULL;
218 CallInfo info(m, k, CHECK_NULL);
219 return init_method_MemberName(mname, info, THREAD);
220 }
221 }
222 return NULL;
223 }
224
225 oop MethodHandles::init_method_MemberName(Handle mname, CallInfo& info, TRAPS) {
226 assert(info.resolved_appendix().is_null(), "only normal methods here");
227 methodHandle m(Thread::current(), info.resolved_method());
228 assert(m.not_null(), "null method handle");
229 InstanceKlass* m_klass = m->method_holder();
230 assert(m_klass != NULL, "null holder for method handle");
231 int flags = (jushort)( m->access_flags().as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS );
232 int vmindex = Method::invalid_vtable_index;
233 LogTarget(Debug, methodhandles, indy) lt_indy;
234
235 switch (info.call_kind()) {
236 case CallInfo::itable_call:
237 vmindex = info.itable_index();
238 // More importantly, the itable index only works with the method holder.
239 assert(m_klass->verify_itable_index(vmindex), "");
240 flags |= IS_METHOD | (JVM_REF_invokeInterface << REFERENCE_KIND_SHIFT);
241 if (lt_indy.is_enabled()) {
242 ResourceMark rm;
243 LogStream ls(lt_indy);
244 ls.print_cr("memberName: invokeinterface method_holder::method: %s, itableindex: %d, access_flags:",
245 Method::name_and_sig_as_C_string(m->method_holder(), m->name(), m->signature()),
771 } else if (ref_kind == JVM_REF_invokeVirtual) {
772 LinkResolver::resolve_virtual_call(result, Handle(), defc,
773 link_info, false, THREAD);
774 } else {
775 assert(false, "ref_kind=%d", ref_kind);
776 }
777 if (HAS_PENDING_EXCEPTION) {
778 if (speculative_resolve) {
779 CLEAR_PENDING_EXCEPTION;
780 }
781 return empty;
782 }
783 }
784 if (result.resolved_appendix().not_null()) {
785 // The resolved MemberName must not be accompanied by an appendix argument,
786 // since there is no way to bind this value into the MemberName.
787 // Caller is responsible to prevent this from happening.
788 THROW_MSG_(vmSymbols::java_lang_InternalError(), "appendix", empty);
789 }
790 result.set_resolved_method_name(CHECK_(empty));
791 oop mname2 = init_method_MemberName(mname, result, THREAD);
792 return Handle(THREAD, mname2);
793 }
794 case IS_CONSTRUCTOR:
795 {
796 CallInfo result;
797 LinkInfo link_info(defc, name, type, caller, access_check);
798 {
799 assert(!HAS_PENDING_EXCEPTION, "");
800 if (name == vmSymbols::object_initializer_name()) {
801 LinkResolver::resolve_special_call(result, Handle(), link_info, THREAD);
802 } else {
803 break; // will throw after end of switch
804 }
805 if (HAS_PENDING_EXCEPTION) {
806 if (speculative_resolve) {
807 CLEAR_PENDING_EXCEPTION;
808 }
809 return empty;
810 }
811 }
812 assert(result.is_statically_bound(), "");
813 result.set_resolved_method_name(CHECK_(empty));
814 oop mname2 = init_method_MemberName(mname, result, THREAD);
815 return Handle(THREAD, mname2);
816 }
817 case IS_FIELD:
818 {
819 fieldDescriptor result; // find_field initializes fd if found
820 {
821 assert(!HAS_PENDING_EXCEPTION, "");
822 LinkInfo link_info(defc, name, type, caller, LinkInfo::skip_access_check);
823 LinkResolver::resolve_field(result, link_info, Bytecodes::_nop, false, THREAD);
824 if (HAS_PENDING_EXCEPTION) {
825 if (speculative_resolve) {
826 CLEAR_PENDING_EXCEPTION;
827 }
828 return empty;
829 }
830 }
831 oop mname2 = init_field_MemberName(mname, result, ref_kind_is_setter(ref_kind));
832 return Handle(THREAD, mname2);
833 }
834 default:
904 if (!have_type) {
905 // If it is a primitive field type, don't mess with short strings like "I".
906 Handle type (THREAD, field_signature_type_or_null(fd.signature()));
907 if (type.is_null()) {
908 type = java_lang_String::create_from_symbol(fd.signature(), CHECK);
909 }
910 java_lang_invoke_MemberName::set_type(mname(), type());
911 }
912 return;
913 }
914 }
915 THROW_MSG(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format");
916 }
917
918 int MethodHandles::find_MemberNames(Klass* k,
919 Symbol* name, Symbol* sig,
920 int mflags, Klass* caller,
921 int skip, objArrayHandle results, TRAPS) {
922 // %%% take caller into account!
923
924 if (k == NULL || !k->is_instance_klass()) return -1;
925
926 int rfill = 0, rlimit = results->length(), rskip = skip;
927 // overflow measurement:
928 int overflow = 0, overflow_limit = MAX2(1000, rlimit);
929
930 int match_flags = mflags;
931 bool search_superc = ((match_flags & SEARCH_SUPERCLASSES) != 0);
932 bool search_intfc = ((match_flags & SEARCH_INTERFACES) != 0);
933 bool local_only = !(search_superc | search_intfc);
934
935 if (name != NULL) {
936 if (name->utf8_length() == 0) return 0; // a match is not possible
937 }
938 if (sig != NULL) {
939 if (sig->starts_with(JVM_SIGNATURE_FUNC))
940 match_flags &= ~(IS_FIELD | IS_TYPE);
941 else
942 match_flags &= ~(IS_CONSTRUCTOR | IS_METHOD);
943 }
944
945 if ((match_flags & IS_TYPE) != 0) {
946 // NYI, and Core Reflection works quite well for this query
947 }
948
949 if ((match_flags & IS_FIELD) != 0) {
950 InstanceKlass* ik = InstanceKlass::cast(k);
951 for (FieldStream st(ik, local_only, !search_intfc); !st.eos(); st.next()) {
952 if (name != NULL && st.name() != name)
953 continue;
954 if (sig != NULL && st.signature() != sig)
955 continue;
956 // passed the filters
957 if (rskip > 0) {
958 --rskip;
959 } else if (rfill < rlimit) {
960 Handle result(THREAD, results->obj_at(rfill++));
961 if (!java_lang_invoke_MemberName::is_instance(result()))
962 return -99; // caller bug!
963 oop saved = MethodHandles::init_field_MemberName(result, st.field_descriptor());
964 if (saved != result())
965 results->obj_at_put(rfill-1, saved); // show saved instance to user
966 } else if (++overflow >= overflow_limit) {
967 match_flags = 0; break; // got tired of looking at overflow
968 }
969 }
970 }
971
972 if ((match_flags & (IS_METHOD | IS_CONSTRUCTOR)) != 0) {
973 // watch out for these guys:
974 Symbol* init_name = vmSymbols::object_initializer_name();
975 Symbol* clinit_name = vmSymbols::class_initializer_name();
976 if (name == clinit_name) clinit_name = NULL; // hack for exposing <clinit>
977 bool negate_name_test = false;
978 // fix name so that it captures the intention of IS_CONSTRUCTOR
979 if (!(match_flags & IS_METHOD)) {
980 // constructors only
991 } else if (name == init_name) {
992 return 0; // no methods of this constructor name
993 }
994 } else {
995 // caller will accept either sort; no need to adjust name
996 }
997 InstanceKlass* ik = InstanceKlass::cast(k);
998 for (MethodStream st(ik, local_only, !search_intfc); !st.eos(); st.next()) {
999 Method* m = st.method();
1000 Symbol* m_name = m->name();
1001 if (m_name == clinit_name)
1002 continue;
1003 if (name != NULL && ((m_name != name) ^ negate_name_test))
1004 continue;
1005 if (sig != NULL && m->signature() != sig)
1006 continue;
1007 // passed the filters
1008 if (rskip > 0) {
1009 --rskip;
1010 } else if (rfill < rlimit) {
1011 Handle result(THREAD, results->obj_at(rfill++));
1012 if (!java_lang_invoke_MemberName::is_instance(result()))
1013 return -99; // caller bug!
1014 CallInfo info(m, NULL, CHECK_0);
1015 oop saved = MethodHandles::init_method_MemberName(result, info, THREAD);
1016 if (saved != result())
1017 results->obj_at_put(rfill-1, saved); // show saved instance to user
1018 } else if (++overflow >= overflow_limit) {
1019 match_flags = 0; break; // got tired of looking at overflow
1020 }
1021 }
1022 }
1023
1024 // return number of elements we at leasted wanted to initialize
1025 return rfill + overflow;
1026 }
1027
1028 void MethodHandles::add_dependent_nmethod(oop call_site, nmethod* nm) {
1029 assert_locked_or_safepoint(CodeCache_lock);
1030
1031 oop context = java_lang_invoke_CallSite::context_no_keepalive(call_site);
1032 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context);
1033 // Try to purge stale entries on updates.
1034 // Since GC doesn't clean dependency contexts rooted at CallSiteContext objects,
1035 // in order to avoid memory leak, stale entries are purged whenever a dependency list
1282 JVM_END
1283
1284 JVM_ENTRY(jobject, MHN_getMemberVMInfo(JNIEnv *env, jobject igcls, jobject mname_jh)) {
1285 if (mname_jh == NULL) return NULL;
1286 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
1287 intptr_t vmindex = java_lang_invoke_MemberName::vmindex(mname());
1288 objArrayHandle result = oopFactory::new_objArray_handle(SystemDictionary::Object_klass(), 2, CHECK_NULL);
1289 jvalue vmindex_value; vmindex_value.j = (long)vmindex;
1290 oop x = java_lang_boxing_object::create(T_LONG, &vmindex_value, CHECK_NULL);
1291 result->obj_at_put(0, x);
1292
1293 int flags = java_lang_invoke_MemberName::flags(mname());
1294 if ((flags & IS_FIELD) != 0) {
1295 x = java_lang_invoke_MemberName::clazz(mname());
1296 } else {
1297 Method* vmtarget = java_lang_invoke_MemberName::vmtarget(mname());
1298 assert(vmtarget != NULL && vmtarget->is_method(), "vmtarget is only method");
1299 x = mname();
1300 }
1301 result->obj_at_put(1, x);
1302 return JNIHandles::make_local(THREAD, result());
1303 }
1304 JVM_END
1305
1306
1307
1308 // static native int getMembers(Class<?> defc, String matchName, String matchSig,
1309 // int matchFlags, Class<?> caller, int skip, MemberName[] results);
1310 JVM_ENTRY(jint, MHN_getMembers(JNIEnv *env, jobject igcls,
1311 jclass clazz_jh, jstring name_jh, jstring sig_jh,
1312 int mflags, jclass caller_jh, jint skip, jobjectArray results_jh)) {
1313 if (clazz_jh == NULL || results_jh == NULL) return -1;
1314 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(clazz_jh));
1315
1316 objArrayHandle results(THREAD, (objArrayOop) JNIHandles::resolve(results_jh));
1317 if (results.is_null() || !results->is_objArray()) return -1;
1318
1319 TempNewSymbol name = NULL;
1320 TempNewSymbol sig = NULL;
1321 if (name_jh != NULL) {
1322 name = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(name_jh));
1530 {CC "clearCallSiteContext", CC "(" CTX ")V", FN_PTR(MHN_clearCallSiteContext)},
1531 {CC "staticFieldOffset", CC "(" MEM ")J", FN_PTR(MHN_staticFieldOffset)},
1532 {CC "staticFieldBase", CC "(" MEM ")" OBJ, FN_PTR(MHN_staticFieldBase)},
1533 {CC "getMemberVMInfo", CC "(" MEM ")" OBJ, FN_PTR(MHN_getMemberVMInfo)}
1534 };
1535
1536 static JNINativeMethod MH_methods[] = {
1537 // UnsupportedOperationException throwers
1538 {CC "invoke", CC "([" OBJ ")" OBJ, FN_PTR(MH_invoke_UOE)},
1539 {CC "invokeExact", CC "([" OBJ ")" OBJ, FN_PTR(MH_invokeExact_UOE)}
1540 };
1541
1542 /**
1543 * This one function is exported, used by NativeLookup.
1544 */
1545 JVM_ENTRY(void, JVM_RegisterMethodHandleMethods(JNIEnv *env, jclass MHN_class)) {
1546 assert(!MethodHandles::enabled(), "must not be enabled");
1547 assert(SystemDictionary::MethodHandle_klass() != NULL, "should be present");
1548
1549 oop mirror = SystemDictionary::MethodHandle_klass()->java_mirror();
1550 jclass MH_class = (jclass) JNIHandles::make_local(THREAD, mirror);
1551
1552 {
1553 ThreadToNativeFromVM ttnfv(thread);
1554
1555 int status = env->RegisterNatives(MHN_class, MHN_methods, sizeof(MHN_methods)/sizeof(JNINativeMethod));
1556 guarantee(status == JNI_OK && !env->ExceptionOccurred(),
1557 "register java.lang.invoke.MethodHandleNative natives");
1558
1559 status = env->RegisterNatives(MH_class, MH_methods, sizeof(MH_methods)/sizeof(JNINativeMethod));
1560 guarantee(status == JNI_OK && !env->ExceptionOccurred(),
1561 "register java.lang.invoke.MethodHandle natives");
1562 }
1563
1564 log_debug(methodhandles, indy)("MethodHandle support loaded (using LambdaForms)");
1565
1566 MethodHandles::set_enabled(true);
1567 }
1568 JVM_END
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