1454 assert(signature != nullptr, "invariant");
1455 return nullptr != ik->find_local_method(name, signature, Klass::OverpassLookupMode::skip, Klass::StaticLookupMode::find,
1456 Klass::PrivateLookupMode::find);
1457 }
1458
1459 // If for a subklass, on initial class load, an implementation exist for any of the final methods declared in Event,
1460 // then constraints are considered breached.
1461 static bool invalid_preconditions_for_subklass_on_initial_load(const InstanceKlass* ik) {
1462 assert(ik != nullptr, "invariant");
1463 return has_local_method_implementation(ik, begin, void_method_sig) ||
1464 has_local_method_implementation(ik, end, void_method_sig) ||
1465 has_local_method_implementation(ik, commit, void_method_sig) ||
1466 has_local_method_implementation(ik, isEnabled, boolean_method_sig) ||
1467 has_local_method_implementation(ik, shouldCommit, boolean_method_sig);
1468 }
1469
1470 static ClassFileStream* schema_extend_event_subklass_bytes(const InstanceKlass* ik, const ClassFileParser& parser, bool& is_instrumented, TRAPS) {
1471 assert(JdkJfrEvent::is_a(ik), "invariant");
1472 assert(!is_instrumented, "invariant");
1473 DEBUG_ONLY(JfrJavaSupport::check_java_thread_in_vm(THREAD));
1474 if (invalid_preconditions_for_subklass_on_initial_load(ik)) {
1475 // Remove the tag denoting this as a jdk.jfr.Event subklass. No instrumentation, hence no events can be written.
1476 // The class is allowed to load as-is, but it is classified as outside of the jfr system.
1477 JdkJfrEvent::remove(ik);
1478 return nullptr;
1479 }
1480 jint size_of_new_bytes = 0;
1481 const u1* new_bytes = schema_extend_event_subklass_bytes(ik, parser, size_of_new_bytes, THREAD);
1482 if (new_bytes == nullptr) {
1483 return nullptr;
1484 }
1485 assert(new_bytes != nullptr, "invariant");
1486 assert(size_of_new_bytes > 0, "invariant");
1487 const bool force_instrumentation = should_force_instrumentation();
1488 if (Jfr::is_recording() || force_instrumentation) {
1489 jint size_of_instrumented_bytes = 0;
1490 unsigned char* instrumented_bytes = nullptr;
1491 const jclass super = static_cast<jclass>(JfrJavaSupport::local_jni_handle(ik->super()->java_mirror(), THREAD));
1492 const jboolean boot_class_loader = ik->class_loader_data()->is_boot_class_loader_data();
1493 JfrUpcalls::new_bytes_eager_instrumentation(JfrTraceId::load_raw(ik),
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1454 assert(signature != nullptr, "invariant");
1455 return nullptr != ik->find_local_method(name, signature, Klass::OverpassLookupMode::skip, Klass::StaticLookupMode::find,
1456 Klass::PrivateLookupMode::find);
1457 }
1458
1459 // If for a subklass, on initial class load, an implementation exist for any of the final methods declared in Event,
1460 // then constraints are considered breached.
1461 static bool invalid_preconditions_for_subklass_on_initial_load(const InstanceKlass* ik) {
1462 assert(ik != nullptr, "invariant");
1463 return has_local_method_implementation(ik, begin, void_method_sig) ||
1464 has_local_method_implementation(ik, end, void_method_sig) ||
1465 has_local_method_implementation(ik, commit, void_method_sig) ||
1466 has_local_method_implementation(ik, isEnabled, boolean_method_sig) ||
1467 has_local_method_implementation(ik, shouldCommit, boolean_method_sig);
1468 }
1469
1470 static ClassFileStream* schema_extend_event_subklass_bytes(const InstanceKlass* ik, const ClassFileParser& parser, bool& is_instrumented, TRAPS) {
1471 assert(JdkJfrEvent::is_a(ik), "invariant");
1472 assert(!is_instrumented, "invariant");
1473 DEBUG_ONLY(JfrJavaSupport::check_java_thread_in_vm(THREAD));
1474 initialize_symbols();
1475 if (invalid_preconditions_for_subklass_on_initial_load(ik)) {
1476 // Remove the tag denoting this as a jdk.jfr.Event subklass. No instrumentation, hence no events can be written.
1477 // The class is allowed to load as-is, but it is classified as outside of the jfr system.
1478 JdkJfrEvent::remove(ik);
1479 return nullptr;
1480 }
1481 jint size_of_new_bytes = 0;
1482 const u1* new_bytes = schema_extend_event_subklass_bytes(ik, parser, size_of_new_bytes, THREAD);
1483 if (new_bytes == nullptr) {
1484 return nullptr;
1485 }
1486 assert(new_bytes != nullptr, "invariant");
1487 assert(size_of_new_bytes > 0, "invariant");
1488 const bool force_instrumentation = should_force_instrumentation();
1489 if (Jfr::is_recording() || force_instrumentation) {
1490 jint size_of_instrumented_bytes = 0;
1491 unsigned char* instrumented_bytes = nullptr;
1492 const jclass super = static_cast<jclass>(JfrJavaSupport::local_jni_handle(ik->super()->java_mirror(), THREAD));
1493 const jboolean boot_class_loader = ik->class_loader_data()->is_boot_class_loader_data();
1494 JfrUpcalls::new_bytes_eager_instrumentation(JfrTraceId::load_raw(ik),
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