1259 assert(signature != nullptr, "invariant");
1260 return nullptr != ik->find_local_method(name, signature, Klass::OverpassLookupMode::skip, Klass::StaticLookupMode::find,
1261 Klass::PrivateLookupMode::find);
1262 }
1263
1264 // If for a subklass, on initial class load, an implementation exist for any of the final methods declared in Event,
1265 // then constraints are considered breached.
1266 static bool invalid_preconditions_for_subklass_on_initial_load(const InstanceKlass* ik) {
1267 assert(ik != nullptr, "invariant");
1268 return has_local_method_implementation(ik, begin, void_method_sig) ||
1269 has_local_method_implementation(ik, end, void_method_sig) ||
1270 has_local_method_implementation(ik, commit, void_method_sig) ||
1271 has_local_method_implementation(ik, isEnabled, boolean_method_sig) ||
1272 has_local_method_implementation(ik, shouldCommit, boolean_method_sig);
1273 }
1274
1275 static ClassFileStream* schema_extend_event_subklass_bytes(const InstanceKlass* ik, const ClassFileParser& parser, bool& is_instrumented, TRAPS) {
1276 assert(JdkJfrEvent::is_a(ik), "invariant");
1277 assert(!is_instrumented, "invariant");
1278 DEBUG_ONLY(JfrJavaSupport::check_java_thread_in_vm(THREAD));
1279 if (invalid_preconditions_for_subklass_on_initial_load(ik)) {
1280 // Remove the tag denoting this as a jdk.jfr.Event subklass. No instrumentation, hence no events can be written.
1281 // The class is allowed to load as-is, but it is classified as outside of the jfr system.
1282 JdkJfrEvent::remove(ik);
1283 return nullptr;
1284 }
1285 jint size_of_new_bytes = 0;
1286 const u1* new_bytes = schema_extend_event_subklass_bytes(ik, parser, size_of_new_bytes, THREAD);
1287 if (new_bytes == nullptr) {
1288 return nullptr;
1289 }
1290 assert(new_bytes != nullptr, "invariant");
1291 assert(size_of_new_bytes > 0, "invariant");
1292 const bool force_instrumentation = should_force_instrumentation();
1293 if (Jfr::is_recording() || force_instrumentation) {
1294 jint size_of_instrumented_bytes = 0;
1295 unsigned char* instrumented_bytes = nullptr;
1296 const jclass super = static_cast<jclass>(JfrJavaSupport::local_jni_handle(ik->super()->java_mirror(), THREAD));
1297 const jboolean boot_class_loader = ik->class_loader_data()->is_boot_class_loader_data();
1298 JfrUpcalls::new_bytes_eager_instrumentation(JfrTraceId::load_raw(ik),
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1259 assert(signature != nullptr, "invariant");
1260 return nullptr != ik->find_local_method(name, signature, Klass::OverpassLookupMode::skip, Klass::StaticLookupMode::find,
1261 Klass::PrivateLookupMode::find);
1262 }
1263
1264 // If for a subklass, on initial class load, an implementation exist for any of the final methods declared in Event,
1265 // then constraints are considered breached.
1266 static bool invalid_preconditions_for_subklass_on_initial_load(const InstanceKlass* ik) {
1267 assert(ik != nullptr, "invariant");
1268 return has_local_method_implementation(ik, begin, void_method_sig) ||
1269 has_local_method_implementation(ik, end, void_method_sig) ||
1270 has_local_method_implementation(ik, commit, void_method_sig) ||
1271 has_local_method_implementation(ik, isEnabled, boolean_method_sig) ||
1272 has_local_method_implementation(ik, shouldCommit, boolean_method_sig);
1273 }
1274
1275 static ClassFileStream* schema_extend_event_subklass_bytes(const InstanceKlass* ik, const ClassFileParser& parser, bool& is_instrumented, TRAPS) {
1276 assert(JdkJfrEvent::is_a(ik), "invariant");
1277 assert(!is_instrumented, "invariant");
1278 DEBUG_ONLY(JfrJavaSupport::check_java_thread_in_vm(THREAD));
1279 initialize_symbols();
1280 if (invalid_preconditions_for_subklass_on_initial_load(ik)) {
1281 // Remove the tag denoting this as a jdk.jfr.Event subklass. No instrumentation, hence no events can be written.
1282 // The class is allowed to load as-is, but it is classified as outside of the jfr system.
1283 JdkJfrEvent::remove(ik);
1284 return nullptr;
1285 }
1286 jint size_of_new_bytes = 0;
1287 const u1* new_bytes = schema_extend_event_subklass_bytes(ik, parser, size_of_new_bytes, THREAD);
1288 if (new_bytes == nullptr) {
1289 return nullptr;
1290 }
1291 assert(new_bytes != nullptr, "invariant");
1292 assert(size_of_new_bytes > 0, "invariant");
1293 const bool force_instrumentation = should_force_instrumentation();
1294 if (Jfr::is_recording() || force_instrumentation) {
1295 jint size_of_instrumented_bytes = 0;
1296 unsigned char* instrumented_bytes = nullptr;
1297 const jclass super = static_cast<jclass>(JfrJavaSupport::local_jni_handle(ik->super()->java_mirror(), THREAD));
1298 const jboolean boot_class_loader = ik->class_loader_data()->is_boot_class_loader_data();
1299 JfrUpcalls::new_bytes_eager_instrumentation(JfrTraceId::load_raw(ik),
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