/* * Copyright (c) 2003, 2022, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. *
*/
// VM operation class to copy jni function table at safepoint. // More than one java threads or jvmti agents may be reading/ // modifying jni function tables. To reduce the risk of bad // interaction b/w these threads it is copied at safepoint. class VM_JNIFunctionTableCopier : public VM_Operation { private: conststruct JNINativeInterface_ *_function_table; public:
VM_JNIFunctionTableCopier(conststruct JNINativeInterface_ *func_tbl) {
_function_table = func_tbl;
};
// // Do not change the "prefix" marker below, everything above it is copied // unchanged into the filled stub, everything below is controlled by the // stub filler (only method bodies are carried forward, and then only for // functionality still in the spec). // // end file prefix
// // Memory Management functions //
// mem_ptr - pre-checked for NULL
jvmtiError
JvmtiEnv::Allocate(jlong size, unsignedchar** mem_ptr) { return allocate(size, mem_ptr);
} /* end Allocate */
// mem - NULL is a valid value, must be checked
jvmtiError
JvmtiEnv::Deallocate(unsignedchar* mem) { return deallocate(mem);
} /* end Deallocate */
// thread - NOT protected by ThreadsListHandle and NOT pre-checked // data - NULL is a valid value, must be checked
jvmtiError
JvmtiEnv::SetThreadLocalStorage(jthread thread, constvoid* data) {
JavaThread* current = JavaThread::current();
JvmtiThreadState* state = NULL;
JvmtiVTMSTransitionDisabler disabler;
ThreadsListHandle tlh(current);
JavaThread* java_thread = NULL;
oop thread_obj = NULL; if (thread == NULL) {
java_thread = current;
state = java_thread->jvmti_thread_state();
} else {
jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, &java_thread, &thread_obj); if (err != JVMTI_ERROR_NONE) { return err;
}
state = java_lang_Thread::jvmti_thread_state(thread_obj);
} if (state == NULL) { if (data == NULL) { // leaving state unset same as data set to NULL return JVMTI_ERROR_NONE;
} // otherwise, create the state
HandleMark hm(current);
Handle thread_handle(current, thread_obj);
state = JvmtiThreadState::state_for(java_thread, thread_handle); if (state == NULL) { return JVMTI_ERROR_THREAD_NOT_ALIVE;
}
}
state->env_thread_state(this)->set_agent_thread_local_storage_data((void*)data); return JVMTI_ERROR_NONE;
} /* end SetThreadLocalStorage */
// thread - NOT protected by ThreadsListHandle and NOT pre-checked // data_ptr - pre-checked for NULL
jvmtiError
JvmtiEnv::GetThreadLocalStorage(jthread thread, void** data_ptr) {
JavaThread* current_thread = JavaThread::current(); if (thread == NULL) {
JvmtiThreadState* state = current_thread->jvmti_thread_state();
*data_ptr = (state == NULL) ? NULL :
state->env_thread_state(this)->get_agent_thread_local_storage_data();
} else { // jvmti_GetThreadLocalStorage is "in native" and doesn't transition // the thread to _thread_in_vm. However, when the TLS for a thread // other than the current thread is required we need to transition // from native so as to resolve the jthread.
*is_modifiable_module_ptr = JNI_TRUE; return JVMTI_ERROR_NONE;
} /* end IsModifiableModule */
// // Class functions //
// class_count_ptr - pre-checked for NULL // classes_ptr - pre-checked for NULL
jvmtiError
JvmtiEnv::GetLoadedClasses(jint* class_count_ptr, jclass** classes_ptr) { return JvmtiGetLoadedClasses::getLoadedClasses(this, class_count_ptr, classes_ptr);
} /* end GetLoadedClasses */
// initiating_loader - NULL is a valid value, must be checked // class_count_ptr - pre-checked for NULL // classes_ptr - pre-checked for NULL
jvmtiError
JvmtiEnv::GetClassLoaderClasses(jobject initiating_loader, jint* class_count_ptr, jclass** classes_ptr) { return JvmtiGetLoadedClasses::getClassLoaderClasses(this, initiating_loader,
class_count_ptr, classes_ptr);
} /* end GetClassLoaderClasses */
// k_mirror - may be primitive, this must be checked // is_modifiable_class_ptr - pre-checked for NULL
jvmtiError
JvmtiEnv::IsModifiableClass(oop k_mirror, jboolean* is_modifiable_class_ptr) {
*is_modifiable_class_ptr = VM_RedefineClasses::is_modifiable_class(k_mirror)?
JNI_TRUE : JNI_FALSE; return JVMTI_ERROR_NONE;
} /* end IsModifiableClass */
// class_count - pre-checked to be greater than or equal to 0 // classes - pre-checked for NULL
jvmtiError
JvmtiEnv::RetransformClasses(jint class_count, const jclass* classes) { //TODO: add locking
int index;
JavaThread* current_thread = JavaThread::current();
ResourceMark rm(current_thread);
if (!VM_RedefineClasses::is_modifiable_class(k_mirror)) { return JVMTI_ERROR_UNMODIFIABLE_CLASS;
}
Klass* klass = java_lang_Class::as_Klass(k_mirror);
jint status = klass->jvmti_class_status(); if (status & (JVMTI_CLASS_STATUS_ERROR)) { return JVMTI_ERROR_INVALID_CLASS;
}
InstanceKlass* ik = InstanceKlass::cast(klass); if (ik->get_cached_class_file_bytes() == NULL) { // Not cached, we need to reconstitute the class file from the // VM representation. We don't attach the reconstituted class // bytes to the InstanceKlass here because they have not been // validated and we're not at a safepoint.
JvmtiClassFileReconstituter reconstituter(ik); if (reconstituter.get_error() != JVMTI_ERROR_NONE) { return reconstituter.get_error();
}
class_definitions[index].class_byte_count = (jint)reconstituter.class_file_size();
class_definitions[index].class_bytes = (unsignedchar*)
reconstituter.class_file_bytes();
} else { // it is cached, get it from the cache
class_definitions[index].class_byte_count = ik->get_cached_class_file_len();
class_definitions[index].class_bytes = ik->get_cached_class_file_bytes();
}
class_definitions[index].klass = jcls;
}
EventRetransformClasses event;
VM_RedefineClasses op(class_count, class_definitions, jvmti_class_load_kind_retransform);
VMThread::execute(&op);
jvmtiError error = op.check_error(); if (error == JVMTI_ERROR_NONE) {
event.set_classCount(class_count);
event.set_redefinitionId(op.id());
event.commit();
} return error;
} /* end RetransformClasses */
// class_count - pre-checked to be greater than or equal to 0 // class_definitions - pre-checked for NULL
jvmtiError
JvmtiEnv::RedefineClasses(jint class_count, const jvmtiClassDefinition* class_definitions) { //TODO: add locking
EventRedefineClasses event;
VM_RedefineClasses op(class_count, class_definitions, jvmti_class_load_kind_redefine);
VMThread::execute(&op);
jvmtiError error = op.check_error(); if (error == JVMTI_ERROR_NONE) {
event.set_classCount(class_count);
event.set_redefinitionId(op.id());
event.commit();
} return error;
} /* end RedefineClasses */
// prefix - NULL is a valid value, must be checked
jvmtiError
JvmtiEnv::SetNativeMethodPrefix(constchar* prefix) { return prefix == NULL?
SetNativeMethodPrefixes(0, NULL) :
SetNativeMethodPrefixes(1, (char**)&prefix);
} /* end SetNativeMethodPrefix */
// prefix_count - pre-checked to be greater than or equal to 0 // prefixes - pre-checked for NULL
jvmtiError
JvmtiEnv::SetNativeMethodPrefixes(jint prefix_count, char** prefixes) { // Have to grab JVMTI thread state lock to be sure that some thread // isn't accessing the prefixes at the same time we are setting them. // No locks during VM bring-up. if (Threads::number_of_threads() == 0) { return set_native_method_prefixes(prefix_count, prefixes);
} else {
MutexLocker mu(JvmtiThreadState_lock); return set_native_method_prefixes(prefix_count, prefixes);
}
} /* end SetNativeMethodPrefixes */
// // Event Management functions //
// callbacks - NULL is a valid value, must be checked // size_of_callbacks - pre-checked to be greater than or equal to 0
jvmtiError
JvmtiEnv::SetEventCallbacks(const jvmtiEventCallbacks* callbacks, jint size_of_callbacks) {
JvmtiVTMSTransitionDisabler disabler;
JvmtiEventController::set_event_callbacks(this, callbacks, size_of_callbacks); return JVMTI_ERROR_NONE;
} /* end SetEventCallbacks */
// event_thread - NULL is a valid value, must be checked
jvmtiError
JvmtiEnv::SetEventNotificationMode(jvmtiEventMode mode, jvmtiEvent event_type, jthread event_thread, ...) { bool enabled = (mode == JVMTI_ENABLE);
// event_type must be valid if (!JvmtiEventController::is_valid_event_type(event_type)) { return JVMTI_ERROR_INVALID_EVENT_TYPE;
}
// assure that needed capabilities are present if (enabled && !JvmtiUtil::has_event_capability(event_type, get_capabilities())) { return JVMTI_ERROR_MUST_POSSESS_CAPABILITY;
}
if (event_thread == NULL) { // Can be called at Agent_OnLoad() time with event_thread == NULL // when Thread::current() does not work yet so we cannot create a // ThreadsListHandle that is common to both thread-specific and // global code paths.
JvmtiEventController::set_user_enabled(this, (JavaThread*) NULL, (oop) NULL, event_type, enabled);
} else { // We have a specified event_thread.
ThreadsListHandle tlh;
// capabilities_ptr - pre-checked for NULL
jvmtiError
JvmtiEnv::GetCapabilities(jvmtiCapabilities* capabilities_ptr) {
JvmtiManageCapabilities::copy_capabilities(get_capabilities(), capabilities_ptr); return JVMTI_ERROR_NONE;
} /* end GetCapabilities */
// // Class Loader Search functions //
// segment - pre-checked for NULL
jvmtiError
JvmtiEnv::AddToBootstrapClassLoaderSearch(constchar* segment) {
jvmtiPhase phase = get_phase(); if (phase == JVMTI_PHASE_ONLOAD) {
Arguments::append_sysclasspath(segment); return JVMTI_ERROR_NONE;
} elseif (use_version_1_0_semantics()) { // This JvmtiEnv requested version 1.0 semantics and this function // is only allowed in the ONLOAD phase in version 1.0 so we need to // return an error here. return JVMTI_ERROR_WRONG_PHASE;
} elseif (phase == JVMTI_PHASE_LIVE) { // The phase is checked by the wrapper that called this function, // but this thread could be racing with the thread that is // terminating the VM so we check one more time.
// create the zip entry
ClassPathZipEntry* zip_entry = ClassLoader::create_class_path_zip_entry(segment, true); if (zip_entry == NULL) { return JVMTI_ERROR_ILLEGAL_ARGUMENT;
}
// add the jar file to the bootclasspath
log_info(class, load)("opened: %s", zip_entry->name()); #if INCLUDE_CDS
ClassLoaderExt::append_boot_classpath(zip_entry); #else
ClassLoader::add_to_boot_append_entries(zip_entry); #endif return JVMTI_ERROR_NONE;
} else { return JVMTI_ERROR_WRONG_PHASE;
}
if (phase == JVMTI_PHASE_ONLOAD) { for (SystemProperty* p = Arguments::system_properties(); p != NULL; p = p->next()) { if (strcmp("java.class.path", p->key()) == 0) {
p->append_value(segment); break;
}
} return JVMTI_ERROR_NONE;
} elseif (phase == JVMTI_PHASE_LIVE) { // The phase is checked by the wrapper that called this function, // but this thread could be racing with the thread that is // terminating the VM so we check one more time.
JavaThread* THREAD = JavaThread::current(); // For exception macros.
HandleMark hm(THREAD);
// create the zip entry (which will open the zip file and hence // check that the segment is indeed a zip file).
ClassPathZipEntry* zip_entry = ClassLoader::create_class_path_zip_entry(segment, false); if (zip_entry == NULL) { return JVMTI_ERROR_ILLEGAL_ARGUMENT;
} delete zip_entry; // no longer needed
// need the path as java.lang.String
Handle path = java_lang_String::create_from_platform_dependent_str(segment, THREAD); if (HAS_PENDING_EXCEPTION) {
CLEAR_PENDING_EXCEPTION; return JVMTI_ERROR_INTERNAL;
}
// Invoke the appendToClassPathForInstrumentation method - if the method // is not found it means the loader doesn't support adding to the class path // in the live phase.
{
JavaValue res(T_VOID);
JavaCalls::call_special(&res,
loader,
loader->klass(),
vmSymbols::appendToClassPathForInstrumentation_name(),
vmSymbols::appendToClassPathForInstrumentation_signature(),
path,
THREAD); if (HAS_PENDING_EXCEPTION) {
Symbol* ex_name = PENDING_EXCEPTION->klass()->name();
CLEAR_PENDING_EXCEPTION;
// data - NULL is a valid value, must be checked
jvmtiError
JvmtiEnv::SetEnvironmentLocalStorage(constvoid* data) {
set_env_local_storage(data); return JVMTI_ERROR_NONE;
} /* end SetEnvironmentLocalStorage */
// data_ptr - pre-checked for NULL
jvmtiError
JvmtiEnv::GetEnvironmentLocalStorage(void** data_ptr) {
*data_ptr = (void*)get_env_local_storage(); return JVMTI_ERROR_NONE;
} /* end GetEnvironmentLocalStorage */
// version_ptr - pre-checked for NULL
jvmtiError
JvmtiEnv::GetVersionNumber(jint* version_ptr) {
*version_ptr = JVMTI_VERSION; return JVMTI_ERROR_NONE;
} /* end GetVersionNumber */
jvmtiError
JvmtiEnv::SetVerboseFlag(jvmtiVerboseFlag flag, jboolean value) {
LogLevelType level = value == 0 ? LogLevel::Off : LogLevel::Info; switch (flag) { case JVMTI_VERBOSE_OTHER: // ignore break; case JVMTI_VERBOSE_CLASS:
LogConfiguration::configure_stdout(level, false, LOG_TAGS(class, unload));
LogConfiguration::configure_stdout(level, false, LOG_TAGS(class, load)); break; case JVMTI_VERBOSE_GC:
LogConfiguration::configure_stdout(level, true, LOG_TAGS(gc)); break; case JVMTI_VERBOSE_JNI:
level = value == 0 ? LogLevel::Off : LogLevel::Debug;
LogConfiguration::configure_stdout(level, true, LOG_TAGS(jni, resolve)); break; default: return JVMTI_ERROR_ILLEGAL_ARGUMENT;
}; return JVMTI_ERROR_NONE;
} /* end SetVerboseFlag */
// format_ptr - pre-checked for NULL
jvmtiError
JvmtiEnv::GetJLocationFormat(jvmtiJlocationFormat* format_ptr) {
*format_ptr = JVMTI_JLOCATION_JVMBCI; return JVMTI_ERROR_NONE;
} /* end GetJLocationFormat */
// // Thread functions //
// thread - NOT protected by ThreadsListHandle and NOT pre-checked // thread_state_ptr - pre-checked for NULL
jvmtiError
JvmtiEnv::GetThreadState(jthread thread, jint* thread_state_ptr) {
JavaThread* current_thread = JavaThread::current();
JvmtiVTMSTransitionDisabler disabler;
ThreadsListHandle tlh(current_thread);
JavaThread* java_thread = NULL;
oop thread_oop = NULL;
jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, &java_thread, &thread_oop); if (err != JVMTI_ERROR_NONE && err != JVMTI_ERROR_THREAD_NOT_ALIVE) { // We got an error code so we don't have a JavaThread*, but only // return an error from here if the error is not because the thread // is a virtual thread. return err;
}
*threads_ptr = jthreads; return JVMTI_ERROR_NONE;
} /* end GetAllThreads */
// thread - NOT protected by ThreadsListHandle and NOT pre-checked
jvmtiError
JvmtiEnv::SuspendThread(jthread thread) {
JavaThread* current = JavaThread::current();
// Do not use JvmtiVTMSTransitionDisabler in context of self suspend to avoid deadlocks. if (java_thread != current) {
err = suspend_thread(thread_oop, java_thread, /* single_suspend */ true, NULL); return err;
}
} // Do self suspend for current JavaThread.
err = suspend_thread(thread_oop, current, /* single_suspend */ true, NULL); return err;
} /* end SuspendThread */
// request_count - pre-checked to be greater than or equal to 0 // request_list - pre-checked for NULL // results - pre-checked for NULL
jvmtiError
JvmtiEnv::SuspendThreadList(jint request_count, const jthread* request_list, jvmtiError* results) {
JavaThread* current = JavaThread::current();
HandleMark hm(current);
Handle self_tobj = Handle(current, NULL); int self_idx = -1;
for (int i = 0; i < request_count; i++) {
JavaThread *java_thread = NULL;
oop thread_oop = NULL;
jthread thread = request_list[i];
jvmtiError err = JvmtiExport::cv_external_thread_to_JavaThread(tlh.list(), thread, &java_thread, &thread_oop);
if (thread_oop != NULL &&
java_lang_VirtualThread::is_instance(thread_oop) &&
!JvmtiEnvBase::is_vthread_alive(thread_oop)) {
err = JVMTI_ERROR_THREAD_NOT_ALIVE;
} if (err != JVMTI_ERROR_NONE) { if (thread_oop == NULL || err != JVMTI_ERROR_INVALID_THREAD) {
results[i] = err; continue;
}
} if (java_thread == current) {
self_idx = i;
self_tobj = Handle(current, thread_oop); continue; // self suspend after all other suspends
}
results[i] = suspend_thread(thread_oop, java_thread, /* single_suspend */ true, NULL);
}
} // Self suspend after all other suspends if necessary. // Do not use JvmtiVTMSTransitionDisabler in context of self suspend to avoid deadlocks. if (self_tobj() != NULL) { // there should not be any error for current java_thread
results[self_idx] = suspend_thread(self_tobj(), current, /* single_suspend */ true, NULL);
} // per-thread suspend results returned via results parameter return JVMTI_ERROR_NONE;
} /* end SuspendThreadList */
jvmtiError
JvmtiEnv::SuspendAllVirtualThreads(jint except_count, const jthread* except_list) { if (!JvmtiExport::can_support_virtual_threads()) { return JVMTI_ERROR_MUST_POSSESS_CAPABILITY;
} if (!Continuations::enabled()) { return JVMTI_ERROR_NONE; // Nothing to do when there are no virtual threads;
}
JavaThread* current = JavaThread::current();
HandleMark hm(current);
Handle self_tobj = Handle(current, NULL);
// Collect threads from except_list for which resumed status must be restored. for (int idx = 0; idx < except_count; idx++) {
jthread thread = except_list[idx];
oop thread_oop = JNIHandles::resolve_external_guard(thread); if (!JvmtiVTSuspender::is_vthread_suspended(thread_oop)) { // is not suspended, so its resumed status must be restored
elist->append(except_list[idx]);
}
}
// Restore resumed state for threads from except list that were not suspended before. for (int idx = 0; idx < elist->length(); idx++) {
jthread thread = elist->at(idx);
oop thread_oop = JNIHandles::resolve_external_guard(thread); if (JvmtiVTSuspender::is_vthread_suspended(thread_oop)) {
JvmtiVTSuspender::register_vthread_resume(thread_oop);
}
}
} // Self suspend after all other suspends if necessary. // Do not use JvmtiVTMSTransitionDisabler in context of self suspend to avoid deadlocks. if (self_tobj() != NULL) {
suspend_thread(self_tobj(), current, /* single_suspend */ false, NULL);
} return JVMTI_ERROR_NONE;
} /* end SuspendAllVirtualThreads */
// thread - NOT protected by ThreadsListHandle and NOT pre-checked
jvmtiError
JvmtiEnv::ResumeThread(jthread thread) {
JvmtiVTMSTransitionDisabler disabler(true);
ThreadsListHandle tlh;
// request_count - pre-checked to be greater than or equal to 0 // request_list - pre-checked for NULL // results - pre-checked for NULL
jvmtiError
JvmtiEnv::ResumeThreadList(jint request_count, const jthread* request_list, jvmtiError* results) {
oop thread_oop = NULL;
JavaThread* java_thread = NULL;
JvmtiVTMSTransitionDisabler disabler(true);
ThreadsListHandle tlh;
for (int i = 0; i < request_count; i++) {
jthread thread = request_list[i];
jvmtiError err = JvmtiExport::cv_external_thread_to_JavaThread(tlh.list(), thread, &java_thread, &thread_oop);
if (thread_oop != NULL &&
java_lang_VirtualThread::is_instance(thread_oop) &&
!JvmtiEnvBase::is_vthread_alive(thread_oop)) {
err = JVMTI_ERROR_THREAD_NOT_ALIVE;
} if (err != JVMTI_ERROR_NONE) { if (thread_oop == NULL || err != JVMTI_ERROR_INVALID_THREAD) {
results[i] = err; continue;
}
}
results[i] = resume_thread(thread_oop, java_thread, /* single_resume */ true);
} // per-thread resume results returned via results parameter return JVMTI_ERROR_NONE;
} /* end ResumeThreadList */
jvmtiError
JvmtiEnv::ResumeAllVirtualThreads(jint except_count, const jthread* except_list) { if (!JvmtiExport::can_support_virtual_threads()) { return JVMTI_ERROR_MUST_POSSESS_CAPABILITY;
} if (!Continuations::enabled()) { return JVMTI_ERROR_NONE; // Nothing to do when there are no virtual threads;
}
jvmtiError err = JvmtiEnvBase::check_thread_list(except_count, except_list); if (err != JVMTI_ERROR_NONE) { return err;
}
ResourceMark rm;
JvmtiVTMSTransitionDisabler disabler(true);
GrowableArray<jthread>* elist = new GrowableArray<jthread>(except_count);
// Collect threads from except_list for which suspended status must be restored. for (int idx = 0; idx < except_count; idx++) {
jthread thread = except_list[idx];
oop thread_oop = JNIHandles::resolve_external_guard(thread); if (JvmtiVTSuspender::is_vthread_suspended(thread_oop)) { // is suspended, so its suspended status must be restored
elist->append(except_list[idx]);
}
}
// Restore suspended state for threads from except list that were suspended before. for (int idx = 0; idx < elist->length(); idx++) {
jthread thread = elist->at(idx);
oop thread_oop = JNIHandles::resolve_external_guard(thread); if (!JvmtiVTSuspender::is_vthread_suspended(thread_oop)) {
JvmtiVTSuspender::register_vthread_suspend(thread_oop);
}
} return JVMTI_ERROR_NONE;
} /* end ResumeAllVirtualThreads */
if (thread_oop != NULL && java_lang_VirtualThread::is_instance(thread_oop)) { // No support for virtual threads (yet). return JVMTI_ERROR_UNSUPPORTED_OPERATION;
} if (err != JVMTI_ERROR_NONE) { return err;
}
oop e = JNIHandles::resolve_external_guard(exception);
NULL_CHECK(e, JVMTI_ERROR_NULL_POINTER);
JavaThread::send_async_exception(java_thread, e);
return JVMTI_ERROR_NONE;
} /* end StopThread */
// thread - NOT protected by ThreadsListHandle and NOT pre-checked
jvmtiError
JvmtiEnv::InterruptThread(jthread thread) {
JavaThread* current_thread = JavaThread::current();
HandleMark hm(current_thread);
if (java_lang_VirtualThread::is_instance(thread_obj)) { // For virtual threads we have to call into Java to interrupt:
Handle obj(current_thread, thread_obj);
JavaValue result(T_VOID);
JavaCalls::call_virtual(&result,
obj,
vmClasses::Thread_klass(),
vmSymbols::interrupt_method_name(),
vmSymbols::void_method_signature(),
current_thread);
return JVMTI_ERROR_NONE;
}
// Really this should be a Java call to Thread.interrupt to ensure the same // semantics, however historically this has not been done for some reason. // So we continue with that (which means we don't interact with any Java-level // Interruptible object) but we must set the Java-level interrupted state.
java_lang_Thread::set_interrupted(thread_obj, true);
java_thread->interrupt();
return JVMTI_ERROR_NONE;
} /* end InterruptThread */
// thread - NOT protected by ThreadsListHandle and NOT pre-checked // info_ptr - pre-checked for NULL
jvmtiError
JvmtiEnv::GetThreadInfo(jthread thread, jvmtiThreadInfo* info_ptr) {
JavaThread* current_thread = JavaThread::current();
ResourceMark rm(current_thread);
HandleMark hm(current_thread);
JavaThread* java_thread = NULL;
oop thread_oop = NULL;
// if thread is NULL the current thread is used if (thread == NULL) {
java_thread = JavaThread::current();
thread_oop = get_vthread_or_thread_oop(java_thread); if (thread_oop == NULL || !thread_oop->is_a(vmClasses::Thread_klass())) { return JVMTI_ERROR_INVALID_THREAD;
}
} else {
jvmtiError err = JvmtiExport::cv_external_thread_to_JavaThread(tlh.list(), thread, &java_thread, &thread_oop); if (err != JVMTI_ERROR_NONE) { // We got an error code so we don't have a JavaThread *, but // only return an error from here if we didn't get a valid // thread_oop. // In the virtual thread case the cv_external_thread_to_JavaThread is expected to correctly set // the thread_oop and return JVMTI_ERROR_INVALID_THREAD which we ignore here. if (thread_oop == NULL) { return err;
}
}
} // We have a valid thread_oop so we can return some thread info.
oop loader = java_lang_Thread::context_class_loader(thread_obj()); if (loader != NULL) { // Do the same as Thread.getContextClassLoader and set context_class_loader to be // the system class loader when the field value is the "not supported" placeholder. if (loader == java_lang_Thread_Constants::get_NOT_SUPPORTED_CLASSLOADER()) {
loader = SystemDictionary::java_system_loader();
}
}
context_class_loader = Handle(current_thread, loader);
{ constchar *n;
if (name() != NULL) {
n = java_lang_String::as_utf8_string(name());
} else { int utf8_length = 0;
n = UNICODE::as_utf8((jchar*) NULL, utf8_length);
}
return JVMTI_ERROR_NONE;
} /* end GetThreadInfo */
// thread - NOT protected by ThreadsListHandle and NOT pre-checked // owned_monitor_count_ptr - pre-checked for NULL // owned_monitors_ptr - pre-checked for NULL
jvmtiError
JvmtiEnv::GetOwnedMonitorInfo(jthread thread, jint* owned_monitor_count_ptr, jobject** owned_monitors_ptr) {
JavaThread* calling_thread = JavaThread::current();
HandleMark hm(calling_thread);
// growable array of jvmti monitors info on the C-heap
GrowableArray<jvmtiMonitorStackDepthInfo*> *owned_monitors_list = new (mtServiceability) GrowableArray<jvmtiMonitorStackDepthInfo*>(1, mtServiceability);
if (java_lang_VirtualThread::is_instance(thread_oop)) { // There is no monitor info to collect if target virtual thread is unmounted. if (java_thread != NULL) {
VirtualThreadGetOwnedMonitorInfoClosure op(this,
Handle(calling_thread, thread_oop),
owned_monitors_list);
Handshake::execute(&op, java_thread);
err = op.result();
}
} else {
EscapeBarrier eb(true, calling_thread, java_thread); if (!eb.deoptimize_objects(MaxJavaStackTraceDepth)) { delete owned_monitors_list; return JVMTI_ERROR_OUT_OF_MEMORY;
}
if (java_thread == calling_thread) { // It is only safe to make a direct call on the current thread. // All other usage needs to use a direct handshake for safety.
err = get_owned_monitors(calling_thread, java_thread, owned_monitors_list);
} else { // get owned monitors info with handshake
GetOwnedMonitorInfoClosure op(calling_thread, this, owned_monitors_list);
Handshake::execute(&op, java_thread);
err = op.result();
}
}
jint owned_monitor_count = owned_monitors_list->length(); if (err == JVMTI_ERROR_NONE) { if ((err = allocate(owned_monitor_count * sizeof(jobject *),
(unsignedchar**)owned_monitors_ptr)) == JVMTI_ERROR_NONE) { // copy into the returned array for (int i = 0; i < owned_monitor_count; i++) {
(*owned_monitors_ptr)[i] =
((jvmtiMonitorStackDepthInfo*)owned_monitors_list->at(i))->monitor;
}
*owned_monitor_count_ptr = owned_monitor_count;
}
} // clean up. for (int i = 0; i < owned_monitor_count; i++) {
deallocate((unsignedchar*)owned_monitors_list->at(i));
} delete owned_monitors_list;
return err;
} /* end GetOwnedMonitorInfo */
// thread - NOT protected by ThreadsListHandle and NOT pre-checked // monitor_info_count_ptr - pre-checked for NULL // monitor_info_ptr - pre-checked for NULL
jvmtiError
JvmtiEnv::GetOwnedMonitorStackDepthInfo(jthread thread, jint* monitor_info_count_ptr, jvmtiMonitorStackDepthInfo** monitor_info_ptr) {
JavaThread* calling_thread = JavaThread::current();
HandleMark hm(calling_thread);
// growable array of jvmti monitors info on the C-heap
GrowableArray<jvmtiMonitorStackDepthInfo*> *owned_monitors_list = new (mtServiceability) GrowableArray<jvmtiMonitorStackDepthInfo*>(1, mtServiceability);
if (java_lang_VirtualThread::is_instance(thread_oop)) { // There is no monitor info to collect if target virtual thread is unmounted. if (java_thread != NULL) {
VirtualThreadGetOwnedMonitorInfoClosure op(this,
Handle(calling_thread, thread_oop),
owned_monitors_list);
Handshake::execute(&op, java_thread);
err = op.result();
}
} else {
EscapeBarrier eb(true, calling_thread, java_thread); if (!eb.deoptimize_objects(MaxJavaStackTraceDepth)) { delete owned_monitors_list; return JVMTI_ERROR_OUT_OF_MEMORY;
}
if (java_thread == calling_thread) { // It is only safe to make a direct call on the current thread. // All other usage needs to use a direct handshake for safety.
err = get_owned_monitors(calling_thread, java_thread, owned_monitors_list);
} else { // get owned monitors info with handshake
GetOwnedMonitorInfoClosure op(calling_thread, this, owned_monitors_list);
Handshake::execute(&op, java_thread);
err = op.result();
}
}
jint owned_monitor_count = owned_monitors_list->length(); if (err == JVMTI_ERROR_NONE) { if ((err = allocate(owned_monitor_count * sizeof(jvmtiMonitorStackDepthInfo),
(unsignedchar**)monitor_info_ptr)) == JVMTI_ERROR_NONE) { // copy to output array. for (int i = 0; i < owned_monitor_count; i++) {
(*monitor_info_ptr)[i].monitor =
((jvmtiMonitorStackDepthInfo*)owned_monitors_list->at(i))->monitor;
(*monitor_info_ptr)[i].stack_depth =
((jvmtiMonitorStackDepthInfo*)owned_monitors_list->at(i))->stack_depth;
}
}
*monitor_info_count_ptr = owned_monitor_count;
}
// clean up. for (int i = 0; i < owned_monitor_count; i++) {
deallocate((unsignedchar*)owned_monitors_list->at(i));
} delete owned_monitors_list;
return err;
} /* end GetOwnedMonitorStackDepthInfo */
// thread - NOT protected by ThreadsListHandle and NOT pre-checked // monitor_ptr - pre-checked for NULL
jvmtiError
JvmtiEnv::GetCurrentContendedMonitor(jthread thread, jobject* monitor_ptr) {
JavaThread* calling_thread = JavaThread::current();
HandleMark hm(calling_thread);
if (java_lang_VirtualThread::is_instance(thread_oop)) { // There is no monitor info to collect if target virtual thread is unmounted. if (java_thread != NULL) {
GetCurrentContendedMonitorClosure op(calling_thread, this, monitor_ptr, /* is_virtual */ true);
Handshake::execute(&op, java_thread);
err = op.result();
} else {
*monitor_ptr = NULL; if (!JvmtiEnvBase::is_vthread_alive(thread_oop)) {
err = JVMTI_ERROR_THREAD_NOT_ALIVE;
}
} return err;
} if (java_thread == calling_thread) { // It is only safe to make a direct call on the current thread. // All other usage needs to use a direct handshake for safety.
err = get_current_contended_monitor(calling_thread, java_thread, monitor_ptr, /* is_virtual */ false);
} else { // get contended monitor information with handshake
GetCurrentContendedMonitorClosure op(calling_thread, this, monitor_ptr, /* is_virtual */ false);
Handshake::execute(&op, java_thread);
err = op.result();
} return err;
} /* end GetCurrentContendedMonitor */
// thread - NOT protected by ThreadsListHandle and NOT pre-checked // proc - pre-checked for NULL // arg - NULL is a valid value, must be checked
jvmtiError
JvmtiEnv::RunAgentThread(jthread thread, jvmtiStartFunction proc, constvoid* arg, jint priority) {
JavaThread* current_thread = JavaThread::current();
JavaThread* java_thread = NULL;
oop thread_oop = NULL;
ThreadsListHandle tlh(current_thread);
jvmtiError err = JvmtiExport::cv_external_thread_to_JavaThread(tlh.list(), thread, &java_thread, &thread_oop); if (err != JVMTI_ERROR_NONE) { // We got an error code so we don't have a JavaThread *, but // only return an error from here if we didn't get a valid // thread_oop. if (thread_oop == NULL) { return err;
} // We have a valid thread_oop.
}
if (java_thread != NULL) { // 'thread' refers to an existing JavaThread. return JVMTI_ERROR_INVALID_THREAD;
} if (java_lang_VirtualThread::is_instance(thread_oop)) { // No support for virtual threads. return JVMTI_ERROR_UNSUPPORTED_OPERATION;
}
JvmtiAgentThread* new_thread = new JvmtiAgentThread(this, proc, arg);
// At this point it may be possible that no osthread was created for the // JavaThread due to lack of resources. if (new_thread->osthread() == NULL) { // The new thread is not known to Thread-SMR yet so we can just delete. delete new_thread; return JVMTI_ERROR_OUT_OF_MEMORY;
}
// Only one top level thread group now.
*group_count_ptr = 1;
// Allocate memory to store global-refs to the thread groups. // Assume this area is freed by caller.
*groups_ptr = (jthreadGroup *) jvmtiMalloc((sizeof(jthreadGroup)) * (*group_count_ptr));
return JVMTI_ERROR_NONE;
} /* end GetThreadGroupChildren */
// // Stack Frame functions //
// thread - NOT protected by ThreadsListHandle and NOT pre-checked // max_frame_count - pre-checked to be greater than or equal to 0 // frame_buffer - pre-checked for NULL // count_ptr - pre-checked for NULL
jvmtiError
JvmtiEnv::GetStackTrace(jthread thread, jint start_depth, jint max_frame_count, jvmtiFrameInfo* frame_buffer, jint* count_ptr) {
JavaThread* current_thread = JavaThread::current();
HandleMark hm(current_thread);
// It is only safe to perform the direct operation on the current // thread. All other usage needs to use a direct handshake for safety. if (java_thread == JavaThread::current()) {
err = get_stack_trace(java_thread, start_depth, max_frame_count, frame_buffer, count_ptr);
} else { // Get stack trace with handshake.
GetStackTraceClosure op(this, start_depth, max_frame_count, frame_buffer, count_ptr);
Handshake::execute(&op, java_thread);
err = op.result();
}
return err;
} /* end GetStackTrace */
// max_frame_count - pre-checked to be greater than or equal to 0 // stack_info_ptr - pre-checked for NULL // thread_count_ptr - pre-checked for NULL
jvmtiError
JvmtiEnv::GetAllStackTraces(jint max_frame_count, jvmtiStackInfo** stack_info_ptr, jint* thread_count_ptr) {
jvmtiError err = JVMTI_ERROR_NONE;
JavaThread* calling_thread = JavaThread::current();
// JVMTI get stack traces at safepoint.
VM_GetAllStackTraces op(this, calling_thread, max_frame_count);
VMThread::execute(&op);
*thread_count_ptr = op.final_thread_count();
*stack_info_ptr = op.stack_info();
err = op.result(); return err;
} /* end GetAllStackTraces */
// thread_count - pre-checked to be greater than or equal to 0 // thread_list - pre-checked for NULL // max_frame_count - pre-checked to be greater than or equal to 0 // stack_info_ptr - pre-checked for NULL
jvmtiError
JvmtiEnv::GetThreadListStackTraces(jint thread_count, const jthread* thread_list, jint max_frame_count, jvmtiStackInfo** stack_info_ptr) {
jvmtiError err = JVMTI_ERROR_NONE;
if (thread_count == 1) {
JvmtiVTMSTransitionDisabler disabler;
// Use direct handshake if we need to get only one stack trace.
JavaThread *current_thread = JavaThread::current();
ThreadsListHandle tlh(current_thread);
// It is only safe to perform the direct operation on the current // thread. All other usage needs to use a direct handshake for safety. if (java_thread == JavaThread::current()) {
err = get_frame_count(java_thread, count_ptr);
} else { // get java stack frame count with handshake.
GetFrameCountClosure op(this, count_ptr);
Handshake::execute(&op, java_thread);
err = op.result();
} return err;
} /* end GetFrameCount */
// thread - NOT protected by ThreadsListHandle and NOT pre-checked
jvmtiError
JvmtiEnv::PopFrame(jthread thread) {
JavaThread* current_thread = JavaThread::current();
HandleMark hm(current_thread);
if (thread_obj != NULL && java_lang_VirtualThread::is_instance(thread_obj)) { // No support for virtual threads (yet). return JVMTI_ERROR_OPAQUE_FRAME;
} if (err != JVMTI_ERROR_NONE) { return err;
}
// retrieve or create the state
JvmtiThreadState* state = JvmtiThreadState::state_for(java_thread); if (state == NULL) { return JVMTI_ERROR_THREAD_NOT_ALIVE;
}
// Eagerly reallocate scalar replaced objects.
EscapeBarrier eb(true, current_thread, java_thread); if (!eb.deoptimize_objects(1)) { // Reallocation of scalar replaced objects failed -> return with error return JVMTI_ERROR_OUT_OF_MEMORY;
}
// It is only safe to perform the direct operation on the current // thread. All other usage needs to use a direct handshake for safety. if (java_thread == JavaThread::current()) {
err = get_frame_location(java_thread, depth, method_ptr, location_ptr);
} else { // JVMTI get java stack frame location via direct handshake.
GetFrameLocationClosure op(this, depth, method_ptr, location_ptr);
Handshake::execute(&op, java_thread);
err = op.result();
} return err;
} /* end GetFrameLocation */
// Threads_lock NOT held, java_thread not protected by lock // depth - pre-checked as non-negative
jvmtiError
JvmtiEnv::NotifyFramePop(jthread thread, jint depth) {
ResourceMark rm;
JvmtiVTMSTransitionDisabler disabler;
ThreadsListHandle tlh;
// thread - NOT protected by ThreadsListHandle and NOT pre-checked
jvmtiError
JvmtiEnv::ForceEarlyReturnObject(jthread thread, jobject value) {
jvalue val;
val.l = value; return force_early_return(thread, val, atos);
} /* end ForceEarlyReturnObject */
// thread - NOT protected by ThreadsListHandle and NOT pre-checked
jvmtiError
JvmtiEnv::ForceEarlyReturnInt(jthread thread, jint value) {
jvalue val;
val.i = value; return force_early_return(thread, val, itos);
} /* end ForceEarlyReturnInt */
// thread - NOT protected by ThreadsListHandle and NOT pre-checked
jvmtiError
JvmtiEnv::ForceEarlyReturnLong(jthread thread, jlong value) {
jvalue val;
val.j = value; return force_early_return(thread, val, ltos);
} /* end ForceEarlyReturnLong */
// thread - NOT protected by ThreadsListHandle and NOT pre-checked
jvmtiError
JvmtiEnv::ForceEarlyReturnFloat(jthread thread, jfloat value) {
jvalue val;
val.f = value; return force_early_return(thread, val, ftos);
} /* end ForceEarlyReturnFloat */
// thread - NOT protected by ThreadsListHandle and NOT pre-checked
jvmtiError
JvmtiEnv::ForceEarlyReturnDouble(jthread thread, jdouble value) {
jvalue val;
val.d = value; return force_early_return(thread, val, dtos);
} /* end ForceEarlyReturnDouble */
// thread - NOT protected by ThreadsListHandle and NOT pre-checked
jvmtiError
JvmtiEnv::ForceEarlyReturnVoid(jthread thread) {
jvalue val;
val.j = 0L; return force_early_return(thread, val, vtos);
} /* end ForceEarlyReturnVoid */
// // Heap functions //
// klass - NULL is a valid value, must be checked // initial_object - NULL is a valid value, must be checked // callbacks - pre-checked for NULL // user_data - NULL is a valid value, must be checked
jvmtiError
JvmtiEnv::FollowReferences(jint heap_filter, jclass klass, jobject initial_object, const jvmtiHeapCallbacks* callbacks, constvoid* user_data) { // check klass if provided
Klass* k = NULL; if (klass != NULL) {
oop k_mirror = JNIHandles::resolve_external_guard(klass); if (k_mirror == NULL) { return JVMTI_ERROR_INVALID_CLASS;
} if (java_lang_Class::is_primitive(k_mirror)) { return JVMTI_ERROR_NONE;
}
k = java_lang_Class::as_Klass(k_mirror); if (klass == NULL) { return JVMTI_ERROR_INVALID_CLASS;
}
}
if (initial_object != NULL) {
oop init_obj = JNIHandles::resolve_external_guard(initial_object); if (init_obj == NULL) { return JVMTI_ERROR_INVALID_OBJECT;
}
}
// klass - NULL is a valid value, must be checked // callbacks - pre-checked for NULL // user_data - NULL is a valid value, must be checked
jvmtiError
JvmtiEnv::IterateThroughHeap(jint heap_filter, jclass klass, const jvmtiHeapCallbacks* callbacks, constvoid* user_data) { // check klass if provided
Klass* k = NULL; if (klass != NULL) {
oop k_mirror = JNIHandles::resolve_external_guard(klass); if (k_mirror == NULL) { return JVMTI_ERROR_INVALID_CLASS;
} if (java_lang_Class::is_primitive(k_mirror)) { return JVMTI_ERROR_NONE;
}
k = java_lang_Class::as_Klass(k_mirror); if (k == NULL) { return JVMTI_ERROR_INVALID_CLASS;
}
}
// tag_count - pre-checked to be greater than or equal to 0 // tags - pre-checked for NULL // count_ptr - pre-checked for NULL // object_result_ptr - NULL is a valid value, must be checked // tag_result_ptr - NULL is a valid value, must be checked
jvmtiError
JvmtiEnv::GetObjectsWithTags(jint tag_count, const jlong* tags, jint* count_ptr, jobject** object_result_ptr, jlong** tag_result_ptr) {
TraceTime t("GetObjectsWithTags", TRACETIME_LOG(Debug, jvmti, objecttagging)); return JvmtiTagMap::tag_map_for(this)->get_objects_with_tags((jlong*)tags, tag_count, count_ptr, object_result_ptr, tag_result_ptr);
} /* end GetObjectsWithTags */
// object_reference_callback - pre-checked for NULL // user_data - NULL is a valid value, must be checked
jvmtiError
JvmtiEnv::IterateOverObjectsReachableFromObject(jobject object, jvmtiObjectReferenceCallback object_reference_callback, constvoid* user_data) {
oop o = JNIHandles::resolve_external_guard(object);
NULL_CHECK(o, JVMTI_ERROR_INVALID_OBJECT);
JvmtiTagMap::tag_map_for(this)->iterate_over_objects_reachable_from_object(object, object_reference_callback, user_data); return JVMTI_ERROR_NONE;
} /* end IterateOverObjectsReachableFromObject */
// heap_root_callback - NULL is a valid value, must be checked // stack_ref_callback - NULL is a valid value, must be checked // object_ref_callback - NULL is a valid value, must be checked // user_data - NULL is a valid value, must be checked
jvmtiError
JvmtiEnv::IterateOverReachableObjects(jvmtiHeapRootCallback heap_root_callback, jvmtiStackReferenceCallback stack_ref_callback, jvmtiObjectReferenceCallback object_ref_callback, constvoid* user_data) {
TraceTime t("IterateOverReachableObjects", TRACETIME_LOG(Debug, jvmti, objecttagging));
JvmtiTagMap::tag_map_for(this)->iterate_over_reachable_objects(heap_root_callback, stack_ref_callback, object_ref_callback, user_data); return JVMTI_ERROR_NONE;
} /* end IterateOverReachableObjects */
// heap_object_callback - pre-checked for NULL // user_data - NULL is a valid value, must be checked
jvmtiError
JvmtiEnv::IterateOverHeap(jvmtiHeapObjectFilter object_filter, jvmtiHeapObjectCallback heap_object_callback, constvoid* user_data) {
TraceTime t("IterateOverHeap", TRACETIME_LOG(Debug, jvmti, objecttagging));
Thread *thread = Thread::current();
HandleMark hm(thread);
JvmtiTagMap::tag_map_for(this)->iterate_over_heap(object_filter, NULL, heap_object_callback, user_data); return JVMTI_ERROR_NONE;
} /* end IterateOverHeap */
// k_mirror - may be primitive, this must be checked // heap_object_callback - pre-checked for NULL // user_data - NULL is a valid value, must be checked
jvmtiError
JvmtiEnv::IterateOverInstancesOfClass(oop k_mirror, jvmtiHeapObjectFilter object_filter, jvmtiHeapObjectCallback heap_object_callback, constvoid* user_data) { if (java_lang_Class::is_primitive(k_mirror)) { // DO PRIMITIVE CLASS PROCESSING return JVMTI_ERROR_NONE;
}
Klass* klass = java_lang_Class::as_Klass(k_mirror); if (klass == NULL) { return JVMTI_ERROR_INVALID_CLASS;
}
TraceTime t("IterateOverInstancesOfClass", TRACETIME_LOG(Debug, jvmti, objecttagging));
JvmtiTagMap::tag_map_for(this)->iterate_over_heap(object_filter, klass, heap_object_callback, user_data); return JVMTI_ERROR_NONE;
} /* end IterateOverInstancesOfClass */
// // Local Variable functions //
// thread - NOT protected by ThreadsListHandle and NOT pre-checked // depth - pre-checked as non-negative // value_ptr - pre-checked for NULL
jvmtiError
JvmtiEnv::GetLocalObject(jthread thread, jint depth, jint slot, jobject* value_ptr) {
JavaThread* current_thread = JavaThread::current(); // rm object is created to clean up the javaVFrame created in // doit_prologue(), but after doit() is finished with it.
ResourceMark rm(current_thread);
HandleMark hm(current_thread);
JvmtiVTMSTransitionDisabler disabler;
ThreadsListHandle tlh(current_thread);
if (java_lang_VirtualThread::is_instance(thread_obj)) {
VM_VirtualThreadGetOrSetLocal op(this, Handle(current_thread, thread_obj),
current_thread, depth, slot, self);
VMThread::execute(&op);
err = op.result(); if (err == JVMTI_ERROR_NONE) {
*value_ptr = op.value().l;
}
} else { // Support for ordinary threads
VM_GetOrSetLocal op(java_thread, current_thread, depth, slot, self);
VMThread::execute(&op);
err = op.result(); if (err == JVMTI_ERROR_NONE) {
*value_ptr = op.value().l;
}
} return err;
} /* end GetLocalObject */
// thread - NOT protected by ThreadsListHandle and NOT pre-checked // depth - pre-checked as non-negative // value - pre-checked for NULL
jvmtiError
JvmtiEnv::GetLocalInstance(jthread thread, jint depth, jobject* value_ptr){
JavaThread* current_thread = JavaThread::current(); // rm object is created to clean up the javaVFrame created in // doit_prologue(), but after doit() is finished with it.
ResourceMark rm(current_thread);
HandleMark hm(current_thread);
JvmtiVTMSTransitionDisabler disabler;
ThreadsListHandle tlh(current_thread);
if (java_lang_VirtualThread::is_instance(thread_obj)) {
VM_VirtualThreadGetReceiver op(this, Handle(current_thread, thread_obj),
current_thread, depth, self);
VMThread::execute(&op);
err = op.result(); if (err == JVMTI_ERROR_NONE) {
*value_ptr = op.value().l;
}
} else { // Support for ordinary threads
VM_GetReceiver op(java_thread, current_thread, depth, self);
VMThread::execute(&op);
err = op.result(); if (err == JVMTI_ERROR_NONE) {
*value_ptr = op.value().l;
}
} return err;
} /* end GetLocalInstance */
// thread - NOT protected by ThreadsListHandle and NOT pre-checked // depth - pre-checked as non-negative // value_ptr - pre-checked for NULL
jvmtiError
JvmtiEnv::GetLocalInt(jthread thread, jint depth, jint slot, jint* value_ptr) {
JavaThread* current_thread = JavaThread::current(); // rm object is created to clean up the javaVFrame created in // doit_prologue(), but after doit() is finished with it.
ResourceMark rm(current_thread);
HandleMark hm(current_thread);
JvmtiVTMSTransitionDisabler disabler;
ThreadsListHandle tlh(current_thread);
if (java_lang_VirtualThread::is_instance(thread_obj)) {
VM_VirtualThreadGetOrSetLocal op(this, Handle(current_thread, thread_obj),
depth, slot, T_INT, self);
VMThread::execute(&op);
err = op.result(); if (err == JVMTI_ERROR_NONE) {
*value_ptr = op.value().i;
}
} else { // Support for ordinary threads
VM_GetOrSetLocal op(java_thread, depth, slot, T_INT, self);
VMThread::execute(&op);
err = op.result(); if (err == JVMTI_ERROR_NONE) {
*value_ptr = op.value().i;
}
} return err;
} /* end GetLocalInt */
// thread - NOT protected by ThreadsListHandle and NOT pre-checked // depth - pre-checked as non-negative // value_ptr - pre-checked for NULL
jvmtiError
JvmtiEnv::GetLocalLong(jthread thread, jint depth, jint slot, jlong* value_ptr) {
JavaThread* current_thread = JavaThread::current(); // rm object is created to clean up the javaVFrame created in // doit_prologue(), but after doit() is finished with it.
ResourceMark rm(current_thread);
HandleMark hm(current_thread);
JvmtiVTMSTransitionDisabler disabler;
ThreadsListHandle tlh(current_thread);
if (java_lang_VirtualThread::is_instance(thread_obj)) {
VM_VirtualThreadGetOrSetLocal op(this, Handle(current_thread, thread_obj),
depth, slot, T_LONG, self);
VMThread::execute(&op);
err = op.result(); if (err == JVMTI_ERROR_NONE) {
*value_ptr = op.value().j;
}
} else { // Support for ordinary threads
VM_GetOrSetLocal op(java_thread, depth, slot, T_LONG, self);
VMThread::execute(&op);
err = op.result(); if (err == JVMTI_ERROR_NONE) {
*value_ptr = op.value().j;
}
} return err;
} /* end GetLocalLong */
// thread - NOT protected by ThreadsListHandle and NOT pre-checked // depth - pre-checked as non-negative // value_ptr - pre-checked for NULL
jvmtiError
JvmtiEnv::GetLocalFloat(jthread thread, jint depth, jint slot, jfloat* value_ptr) {
JavaThread* current_thread = JavaThread::current(); // rm object is created to clean up the javaVFrame created in // doit_prologue(), but after doit() is finished with it.
ResourceMark rm(current_thread);
HandleMark hm(current_thread);
JvmtiVTMSTransitionDisabler disabler;
ThreadsListHandle tlh(current_thread);
if (java_lang_VirtualThread::is_instance(thread_obj)) {
VM_VirtualThreadGetOrSetLocal op(this, Handle(current_thread, thread_obj),
depth, slot, T_FLOAT, self);
VMThread::execute(&op);
err = op.result(); if (err == JVMTI_ERROR_NONE) {
*value_ptr = op.value().f;
}
} else { // Support for ordinary threads
VM_GetOrSetLocal op(java_thread, depth, slot, T_FLOAT, self);
VMThread::execute(&op);
err = op.result(); if (err == JVMTI_ERROR_NONE) {
*value_ptr = op.value().f;
}
} return err;
} /* end GetLocalFloat */
// thread - NOT protected by ThreadsListHandle and NOT pre-checked // depth - pre-checked as non-negative // value_ptr - pre-checked for NULL
jvmtiError
JvmtiEnv::GetLocalDouble(jthread thread, jint depth, jint slot, jdouble* value_ptr) {
JavaThread* current_thread = JavaThread::current(); // rm object is created to clean up the javaVFrame created in // doit_prologue(), but after doit() is finished with it.
ResourceMark rm(current_thread);
HandleMark hm(current_thread);
JvmtiVTMSTransitionDisabler disabler;
ThreadsListHandle tlh(current_thread);
if (java_lang_VirtualThread::is_instance(thread_obj)) {
VM_VirtualThreadGetOrSetLocal op(this, Handle(current_thread, thread_obj),
depth, slot, T_DOUBLE, self);
VMThread::execute(&op);
err = op.result(); if (err == JVMTI_ERROR_NONE) {
*value_ptr = op.value().d;
}
} else { // Support for ordinary threads
VM_GetOrSetLocal op(java_thread, depth, slot, T_DOUBLE, self);
VMThread::execute(&op);
err = op.result(); if (err == JVMTI_ERROR_NONE) {
*value_ptr = op.value().d;
}
} return err;
} /* end GetLocalDouble */
// thread - NOT protected by ThreadsListHandle and NOT pre-checked // depth - pre-checked as non-negative
jvmtiError
JvmtiEnv::SetLocalObject(jthread thread, jint depth, jint slot, jobject value) {
JavaThread* current_thread = JavaThread::current(); // rm object is created to clean up the javaVFrame created in // doit_prologue(), but after doit() is finished with it.
ResourceMark rm(current_thread);
HandleMark hm(current_thread);
JvmtiVTMSTransitionDisabler disabler;
ThreadsListHandle tlh(current_thread);
// thread - NOT protected by ThreadsListHandle and NOT pre-checked // depth - pre-checked as non-negative
jvmtiError
JvmtiEnv::SetLocalInt(jthread thread, jint depth, jint slot, jint value) {
JavaThread* current_thread = JavaThread::current(); // rm object is created to clean up the javaVFrame created in // doit_prologue(), but after doit() is finished with it.
ResourceMark rm(current_thread);
HandleMark hm(current_thread);
JvmtiVTMSTransitionDisabler disabler;
ThreadsListHandle tlh(current_thread);
// thread - NOT protected by ThreadsListHandle and NOT pre-checked // depth - pre-checked as non-negative
jvmtiError
JvmtiEnv::SetLocalLong(jthread thread, jint depth, jint slot, jlong value) {
JavaThread* current_thread = JavaThread::current(); // rm object is created to clean up the javaVFrame created in // doit_prologue(), but after doit() is finished with it.
ResourceMark rm(current_thread);
HandleMark hm(current_thread);
JvmtiVTMSTransitionDisabler disabler;
ThreadsListHandle tlh(current_thread);
// thread - NOT protected by ThreadsListHandle and NOT pre-checked // depth - pre-checked as non-negative
jvmtiError
JvmtiEnv::SetLocalFloat(jthread thread, jint depth, jint slot, jfloat value) {
JavaThread* current_thread = JavaThread::current(); // rm object is created to clean up the javaVFrame created in // doit_prologue(), but after doit() is finished with it.
ResourceMark rm(current_thread);
HandleMark hm(current_thread);
JvmtiVTMSTransitionDisabler disabler;
ThreadsListHandle tlh(current_thread);
// thread - NOT protected by ThreadsListHandle and NOT pre-checked // depth - pre-checked as non-negative
jvmtiError
JvmtiEnv::SetLocalDouble(jthread thread, jint depth, jint slot, jdouble value) {
JavaThread* current_thread = JavaThread::current(); // rm object is created to clean up the javaVFrame created in // doit_prologue(), but after doit() is finished with it.
ResourceMark rm(current_thread);
HandleMark hm(current_thread);
JvmtiVTMSTransitionDisabler disabler;
ThreadsListHandle tlh(current_thread);
// method - pre-checked for validity, but may be NULL meaning obsolete method
jvmtiError
JvmtiEnv::SetBreakpoint(Method* method, jlocation location) {
NULL_CHECK(method, JVMTI_ERROR_INVALID_METHODID); if (location < 0) { // simple invalid location check first return JVMTI_ERROR_INVALID_LOCATION;
} // verify that the breakpoint is not past the end of the method if (location >= (jlocation) method->code_size()) { return JVMTI_ERROR_INVALID_LOCATION;
}
if (TraceJVMTICalls) {
jvmti_breakpoints.print();
}
return JVMTI_ERROR_NONE;
} /* end SetBreakpoint */
// method - pre-checked for validity, but may be NULL meaning obsolete method
jvmtiError
JvmtiEnv::ClearBreakpoint(Method* method, jlocation location) {
NULL_CHECK(method, JVMTI_ERROR_INVALID_METHODID);
if (location < 0) { // simple invalid location check first return JVMTI_ERROR_INVALID_LOCATION;
}
// verify that the breakpoint is not past the end of the method if (location >= (jlocation) method->code_size()) { return JVMTI_ERROR_INVALID_LOCATION;
}
JvmtiBreakpoint bp(method, location);
JvmtiBreakpoints& jvmti_breakpoints = JvmtiCurrentBreakpoints::get_jvmti_breakpoints(); if (jvmti_breakpoints.clear(bp) == JVMTI_ERROR_NOT_FOUND) return JVMTI_ERROR_NOT_FOUND;
if (TraceJVMTICalls) {
jvmti_breakpoints.print();
}
return JVMTI_ERROR_NONE;
} /* end ClearBreakpoint */
// // Watched Field functions //
jvmtiError
JvmtiEnv::SetFieldAccessWatch(fieldDescriptor* fdesc_ptr) { // make sure we haven't set this watch before if (fdesc_ptr->is_field_access_watched()) return JVMTI_ERROR_DUPLICATE;
fdesc_ptr->set_is_field_access_watched(true);
return JVMTI_ERROR_NONE;
} /* end SetFieldAccessWatch */
jvmtiError
JvmtiEnv::ClearFieldAccessWatch(fieldDescriptor* fdesc_ptr) { // make sure we have a watch to clear if (!fdesc_ptr->is_field_access_watched()) return JVMTI_ERROR_NOT_FOUND;
fdesc_ptr->set_is_field_access_watched(false);
return JVMTI_ERROR_NONE;
} /* end ClearFieldAccessWatch */
jvmtiError
JvmtiEnv::SetFieldModificationWatch(fieldDescriptor* fdesc_ptr) { // make sure we haven't set this watch before if (fdesc_ptr->is_field_modification_watched()) return JVMTI_ERROR_DUPLICATE;
fdesc_ptr->set_is_field_modification_watched(true);
return JVMTI_ERROR_NONE;
} /* end SetFieldModificationWatch */
jvmtiError
JvmtiEnv::ClearFieldModificationWatch(fieldDescriptor* fdesc_ptr) { // make sure we have a watch to clear if (!fdesc_ptr->is_field_modification_watched()) return JVMTI_ERROR_NOT_FOUND;
fdesc_ptr->set_is_field_modification_watched(false);
return JVMTI_ERROR_NONE;
} /* end ClearFieldModificationWatch */
// // Class functions //
// k_mirror - may be primitive, this must be checked // signature_ptr - NULL is a valid value, must be checked // generic_ptr - NULL is a valid value, must be checked
jvmtiError
JvmtiEnv::GetClassSignature(oop k_mirror, char** signature_ptr, char** generic_ptr) {
ResourceMark rm; bool isPrimitive = java_lang_Class::is_primitive(k_mirror);
Klass* k = NULL; if (!isPrimitive) {
k = java_lang_Class::as_Klass(k_mirror);
NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS);
} if (signature_ptr != NULL) { char* result = NULL; if (isPrimitive) { char tchar = type2char(java_lang_Class::primitive_type(k_mirror));
result = (char*) jvmtiMalloc(2);
result[0] = tchar;
result[1] = '\0';
} else { constchar* class_sig = k->signature_name();
result = (char *) jvmtiMalloc(strlen(class_sig)+1);
strcpy(result, class_sig);
}
*signature_ptr = result;
} if (generic_ptr != NULL) {
*generic_ptr = NULL; if (!isPrimitive && k->is_instance_klass()) {
Symbol* soo = InstanceKlass::cast(k)->generic_signature(); if (soo != NULL) { constchar *gen_sig = soo->as_C_string(); if (gen_sig != NULL) { char* gen_result;
jvmtiError err = allocate(strlen(gen_sig) + 1,
(unsignedchar **)&gen_result); if (err != JVMTI_ERROR_NONE) { return err;
}
strcpy(gen_result, gen_sig);
*generic_ptr = gen_result;
}
}
}
} return JVMTI_ERROR_NONE;
} /* end GetClassSignature */
// k_mirror - may be primitive, this must be checked // status_ptr - pre-checked for NULL
jvmtiError
JvmtiEnv::GetClassStatus(oop k_mirror, jint* status_ptr) {
jint result = 0; if (java_lang_Class::is_primitive(k_mirror)) {
result |= JVMTI_CLASS_STATUS_PRIMITIVE;
} else {
Klass* k = java_lang_Class::as_Klass(k_mirror);
NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS);
result = k->jvmti_class_status();
}
*status_ptr = result;
return JVMTI_ERROR_NONE;
} /* end GetClassStatus */
// k_mirror - may be primitive, this must be checked // source_name_ptr - pre-checked for NULL
jvmtiError
JvmtiEnv::GetSourceFileName(oop k_mirror, char** source_name_ptr) { if (java_lang_Class::is_primitive(k_mirror)) { return JVMTI_ERROR_ABSENT_INFORMATION;
}
Klass* k_klass = java_lang_Class::as_Klass(k_mirror);
NULL_CHECK(k_klass, JVMTI_ERROR_INVALID_CLASS);
if (!k_klass->is_instance_klass()) { return JVMTI_ERROR_ABSENT_INFORMATION;
}
return JVMTI_ERROR_NONE;
} /* end GetSourceFileName */
// k_mirror - may be primitive, this must be checked // modifiers_ptr - pre-checked for NULL
jvmtiError
JvmtiEnv::GetClassModifiers(oop k_mirror, jint* modifiers_ptr) {
JavaThread* current_thread = JavaThread::current();
jint result = 0; if (!java_lang_Class::is_primitive(k_mirror)) {
Klass* k = java_lang_Class::as_Klass(k_mirror);
NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS);
result = k->compute_modifier_flags();
// Reset the deleted ACC_SUPER bit (deleted in compute_modifier_flags()). if (k->is_super()) {
result |= JVM_ACC_SUPER;
}
} else {
result = (JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC);
}
*modifiers_ptr = result;
return JVMTI_ERROR_NONE;
} /* end GetClassModifiers */
// k_mirror - may be primitive, this must be checked // method_count_ptr - pre-checked for NULL // methods_ptr - pre-checked for NULL
jvmtiError
JvmtiEnv::GetClassMethods(oop k_mirror, jint* method_count_ptr, jmethodID** methods_ptr) {
JavaThread* current_thread = JavaThread::current();
HandleMark hm(current_thread);
// Return CLASS_NOT_PREPARED error as per JVMTI spec. if (!(k->jvmti_class_status() & (JVMTI_CLASS_STATUS_PREPARED|JVMTI_CLASS_STATUS_ARRAY) )) { return JVMTI_ERROR_CLASS_NOT_PREPARED;
}
if (!k->is_instance_klass()) {
*method_count_ptr = 0;
*methods_ptr = (jmethodID*) jvmtiMalloc(0 * sizeof(jmethodID)); return JVMTI_ERROR_NONE;
}
InstanceKlass* ik = InstanceKlass::cast(k); // Allocate the result and fill it in int result_length = ik->methods()->length();
jmethodID* result_list = (jmethodID*)jvmtiMalloc(result_length * sizeof(jmethodID)); int index; bool jmethodids_found = true; int skipped = 0; // skip overpass methods
for (index = 0; index < result_length; index++) {
Method* m = ik->methods()->at(index); // Depending on can_maintain_original_method_order capability use the original // method ordering indices stored in the class, so we can emit jmethodIDs in // the order they appeared in the class file or just copy in current order. int result_index = JvmtiExport::can_maintain_original_method_order() ? ik->method_ordering()->at(index) : index;
assert(result_index >= 0 && result_index < result_length, "invalid original method index"); if (m->is_overpass()) {
result_list[result_index] = NULL;
skipped++; continue;
}
jmethodID id; if (jmethodids_found) {
id = m->find_jmethod_id_or_null(); if (id == NULL) { // If we find an uninitialized value, make sure there is // enough space for all the uninitialized values we might // find.
ik->ensure_space_for_methodids(index);
jmethodids_found = false;
id = m->jmethod_id();
}
} else {
id = m->jmethod_id();
}
result_list[result_index] = id;
}
int result_count = 0; // First, count the fields.
FilteredFieldStream flds(ik, true, true);
result_count = flds.field_count();
// Allocate the result and fill it in
jfieldID* result_list = (jfieldID*) jvmtiMalloc(result_count * sizeof(jfieldID)); // The JVMTI spec requires fields in the order they occur in the class file, // this is the reverse order of what FieldStream hands out. int id_index = (result_count - 1);
for (FilteredFieldStream src_st(ik, true, true); !src_st.eos(); src_st.next()) {
result_list[id_index--] = jfieldIDWorkaround::to_jfieldID(
ik, src_st.offset(),
src_st.access_flags().is_static());
}
assert(id_index == -1, "just checking"); // Fill in the results
*field_count_ptr = result_count;
*fields_ptr = result_list;
return JVMTI_ERROR_NONE;
} /* end GetClassFields */
// k_mirror - may be primitive, this must be checked // interface_count_ptr - pre-checked for NULL // interfaces_ptr - pre-checked for NULL
jvmtiError
JvmtiEnv::GetImplementedInterfaces(oop k_mirror, jint* interface_count_ptr, jclass** interfaces_ptr) {
{ if (java_lang_Class::is_primitive(k_mirror)) {
*interface_count_ptr = 0;
*interfaces_ptr = (jclass*) jvmtiMalloc(0 * sizeof(jclass)); return JVMTI_ERROR_NONE;
}
JavaThread* current_thread = JavaThread::current();
HandleMark hm(current_thread);
Klass* k = java_lang_Class::as_Klass(k_mirror);
NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS);
// Return CLASS_NOT_PREPARED error as per JVMTI spec. if (!(k->jvmti_class_status() & (JVMTI_CLASS_STATUS_PREPARED|JVMTI_CLASS_STATUS_ARRAY) )) return JVMTI_ERROR_CLASS_NOT_PREPARED;
return JVMTI_ERROR_NONE;
} /* end GetImplementedInterfaces */
// k_mirror - may be primitive, this must be checked // minor_version_ptr - pre-checked for NULL // major_version_ptr - pre-checked for NULL
jvmtiError
JvmtiEnv::GetClassVersionNumbers(oop k_mirror, jint* minor_version_ptr, jint* major_version_ptr) { if (java_lang_Class::is_primitive(k_mirror)) { return JVMTI_ERROR_ABSENT_INFORMATION;
}
Klass* klass = java_lang_Class::as_Klass(k_mirror);
jint status = klass->jvmti_class_status(); if (status & (JVMTI_CLASS_STATUS_ERROR)) { return JVMTI_ERROR_INVALID_CLASS;
} if (status & (JVMTI_CLASS_STATUS_ARRAY)) { return JVMTI_ERROR_ABSENT_INFORMATION;
}
InstanceKlass* ik = InstanceKlass::cast(klass);
*minor_version_ptr = ik->minor_version();
*major_version_ptr = ik->major_version();
return JVMTI_ERROR_NONE;
} /* end GetClassVersionNumbers */
// k_mirror - may be primitive, this must be checked // constant_pool_count_ptr - pre-checked for NULL // constant_pool_byte_count_ptr - pre-checked for NULL // constant_pool_bytes_ptr - pre-checked for NULL
jvmtiError
JvmtiEnv::GetConstantPool(oop k_mirror, jint* constant_pool_count_ptr, jint* constant_pool_byte_count_ptr, unsignedchar** constant_pool_bytes_ptr) { if (java_lang_Class::is_primitive(k_mirror)) { return JVMTI_ERROR_ABSENT_INFORMATION;
}
Klass* klass = java_lang_Class::as_Klass(k_mirror);
Thread *thread = Thread::current();
ResourceMark rm(thread);
jint status = klass->jvmti_class_status(); if (status & (JVMTI_CLASS_STATUS_ERROR)) { return JVMTI_ERROR_INVALID_CLASS;
} if (status & (JVMTI_CLASS_STATUS_ARRAY)) { return JVMTI_ERROR_ABSENT_INFORMATION;
}
InstanceKlass* ik = InstanceKlass::cast(klass);
JvmtiConstantPoolReconstituter reconstituter(ik); if (reconstituter.get_error() != JVMTI_ERROR_NONE) { return reconstituter.get_error();
}
unsignedchar *cpool_bytes; int cpool_size = reconstituter.cpool_size(); if (reconstituter.get_error() != JVMTI_ERROR_NONE) { return reconstituter.get_error();
}
jvmtiError res = allocate(cpool_size, &cpool_bytes); if (res != JVMTI_ERROR_NONE) { return res;
}
reconstituter.copy_cpool_bytes(cpool_bytes); if (reconstituter.get_error() != JVMTI_ERROR_NONE) { return reconstituter.get_error();
}
return JVMTI_ERROR_NONE;
} /* end GetConstantPool */
// k_mirror - may be primitive, this must be checked // is_interface_ptr - pre-checked for NULL
jvmtiError
JvmtiEnv::IsInterface(oop k_mirror, jboolean* is_interface_ptr) {
{ bool result = false; if (!java_lang_Class::is_primitive(k_mirror)) {
Klass* k = java_lang_Class::as_Klass(k_mirror); if (k != NULL && k->is_interface()) {
result = true;
}
}
*is_interface_ptr = result;
}
return JVMTI_ERROR_NONE;
} /* end IsInterface */
// k_mirror - may be primitive, this must be checked // is_array_class_ptr - pre-checked for NULL
jvmtiError
JvmtiEnv::IsArrayClass(oop k_mirror, jboolean* is_array_class_ptr) {
{ bool result = false; if (!java_lang_Class::is_primitive(k_mirror)) {
Klass* k = java_lang_Class::as_Klass(k_mirror); if (k != NULL && k->is_array_klass()) {
result = true;
}
}
*is_array_class_ptr = result;
}
return JVMTI_ERROR_NONE;
} /* end IsArrayClass */
// k_mirror - may be primitive, this must be checked // classloader_ptr - pre-checked for NULL
jvmtiError
JvmtiEnv::GetClassLoader(oop k_mirror, jobject* classloader_ptr) {
{ if (java_lang_Class::is_primitive(k_mirror)) {
*classloader_ptr = (jclass) jni_reference(Handle()); return JVMTI_ERROR_NONE;
}
JavaThread* current_thread = JavaThread::current();
HandleMark hm(current_thread);
Klass* k = java_lang_Class::as_Klass(k_mirror);
NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS);
{
jint result = (jint) mirror->identity_hash();
*hash_code_ptr = result;
} return JVMTI_ERROR_NONE;
} /* end GetObjectHashCode */
// info_ptr - pre-checked for NULL
jvmtiError
JvmtiEnv::GetObjectMonitorUsage(jobject object, jvmtiMonitorUsage* info_ptr) { // This needs to be performed at a safepoint to gather stable data // because monitor owner / waiters might not be suspended.
VM_GetObjectMonitorUsage op(this, JavaThread::current(), object, info_ptr);
VMThread::execute(&op); return op.result();
} /* end GetObjectMonitorUsage */
// // Field functions //
// name_ptr - NULL is a valid value, must be checked // signature_ptr - NULL is a valid value, must be checked // generic_ptr - NULL is a valid value, must be checked
jvmtiError
JvmtiEnv::GetFieldName(fieldDescriptor* fdesc_ptr, char** name_ptr, char** signature_ptr, char** generic_ptr) {
JavaThread* current_thread = JavaThread::current();
ResourceMark rm(current_thread); if (name_ptr == NULL) { // just don't return the name
} else { constchar* fieldName = fdesc_ptr->name()->as_C_string();
*name_ptr = (char*) jvmtiMalloc(strlen(fieldName) + 1); if (*name_ptr == NULL) return JVMTI_ERROR_OUT_OF_MEMORY;
strcpy(*name_ptr, fieldName);
} if (signature_ptr== NULL) { // just don't return the signature
} else { constchar* fieldSignature = fdesc_ptr->signature()->as_C_string();
*signature_ptr = (char*) jvmtiMalloc(strlen(fieldSignature) + 1); if (*signature_ptr == NULL) return JVMTI_ERROR_OUT_OF_MEMORY;
strcpy(*signature_ptr, fieldSignature);
} if (generic_ptr != NULL) {
*generic_ptr = NULL;
Symbol* soop = fdesc_ptr->generic_signature(); if (soop != NULL) { constchar* gen_sig = soop->as_C_string(); if (gen_sig != NULL) {
jvmtiError err = allocate(strlen(gen_sig) + 1, (unsignedchar **)generic_ptr); if (err != JVMTI_ERROR_NONE) { return err;
}
strcpy(*generic_ptr, gen_sig);
}
}
} return JVMTI_ERROR_NONE;
} /* end GetFieldName */
// method - pre-checked for validity, but may be NULL meaning obsolete method // name_ptr - NULL is a valid value, must be checked // signature_ptr - NULL is a valid value, must be checked // generic_ptr - NULL is a valid value, must be checked
jvmtiError
JvmtiEnv::GetMethodName(Method* method, char** name_ptr, char** signature_ptr, char** generic_ptr) {
NULL_CHECK(method, JVMTI_ERROR_INVALID_METHODID);
JavaThread* current_thread = JavaThread::current();
ResourceMark rm(current_thread); // get the utf8 name and signature if (name_ptr == NULL) { // just don't return the name
} else { constchar* utf8_name = (constchar *) method->name()->as_utf8();
*name_ptr = (char *) jvmtiMalloc(strlen(utf8_name)+1);
strcpy(*name_ptr, utf8_name);
} if (signature_ptr == NULL) { // just don't return the signature
} else { constchar* utf8_signature = (constchar *) method->signature()->as_utf8();
*signature_ptr = (char *) jvmtiMalloc(strlen(utf8_signature) + 1);
strcpy(*signature_ptr, utf8_signature);
}
// method - pre-checked for validity, but may be NULL meaning obsolete method // declaring_class_ptr - pre-checked for NULL
jvmtiError
JvmtiEnv::GetMethodDeclaringClass(Method* method, jclass* declaring_class_ptr) {
NULL_CHECK(method, JVMTI_ERROR_INVALID_METHODID);
(*declaring_class_ptr) = get_jni_class_non_null(method->method_holder()); return JVMTI_ERROR_NONE;
} /* end GetMethodDeclaringClass */
// method - pre-checked for validity, but may be NULL meaning obsolete method // modifiers_ptr - pre-checked for NULL
jvmtiError
JvmtiEnv::GetMethodModifiers(Method* method, jint* modifiers_ptr) {
NULL_CHECK(method, JVMTI_ERROR_INVALID_METHODID);
(*modifiers_ptr) = method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS; return JVMTI_ERROR_NONE;
} /* end GetMethodModifiers */
// method - pre-checked for validity, but may be NULL meaning obsolete method // max_ptr - pre-checked for NULL
jvmtiError
JvmtiEnv::GetMaxLocals(Method* method, jint* max_ptr) {
NULL_CHECK(method, JVMTI_ERROR_INVALID_METHODID); // get max stack
(*max_ptr) = method->max_locals(); return JVMTI_ERROR_NONE;
} /* end GetMaxLocals */
// method - pre-checked for validity, but may be NULL meaning obsolete method // size_ptr - pre-checked for NULL
jvmtiError
JvmtiEnv::GetArgumentsSize(Method* method, jint* size_ptr) {
NULL_CHECK(method, JVMTI_ERROR_INVALID_METHODID); // get size of arguments
(*size_ptr) = method->size_of_parameters(); return JVMTI_ERROR_NONE;
} /* end GetArgumentsSize */
// method - pre-checked for validity, but may be NULL meaning obsolete method // entry_count_ptr - pre-checked for NULL // table_ptr - pre-checked for NULL
jvmtiError
JvmtiEnv::GetLineNumberTable(Method* method, jint* entry_count_ptr, jvmtiLineNumberEntry** table_ptr) {
NULL_CHECK(method, JVMTI_ERROR_INVALID_METHODID); if (!method->has_linenumber_table()) { return (JVMTI_ERROR_ABSENT_INFORMATION);
}
// The line number table is compressed so we don't know how big it is until decompressed. // Decompression is really fast so we just do it twice.
// Fill jvmti table if (num_entries > 0) { int index = 0;
CompressedLineNumberReadStream stream(method->compressed_linenumber_table()); while (stream.read_pair()) {
jvmti_table[index].start_location = (jlocation) stream.bci();
jvmti_table[index].line_number = (jint) stream.line();
index++;
}
assert(index == num_entries, "sanity check");
}
// Set up results
(*entry_count_ptr) = num_entries;
(*table_ptr) = jvmti_table;
return JVMTI_ERROR_NONE;
} /* end GetLineNumberTable */
// method - pre-checked for validity, but may be NULL meaning obsolete method // start_location_ptr - pre-checked for NULL // end_location_ptr - pre-checked for NULL
jvmtiError
JvmtiEnv::GetMethodLocation(Method* method, jlocation* start_location_ptr, jlocation* end_location_ptr) {
NULL_CHECK(method, JVMTI_ERROR_INVALID_METHODID); // get start and end location
(*end_location_ptr) = (jlocation) (method->code_size() - 1); if (method->code_size() == 0) { // there is no code so there is no start location
(*start_location_ptr) = (jlocation)(-1);
} else {
(*start_location_ptr) = (jlocation)(0);
}
return JVMTI_ERROR_NONE;
} /* end GetMethodLocation */
// method - pre-checked for validity, but may be NULL meaning obsolete method // entry_count_ptr - pre-checked for NULL // table_ptr - pre-checked for NULL
jvmtiError
JvmtiEnv::GetLocalVariableTable(Method* method, jint* entry_count_ptr, jvmtiLocalVariableEntry** table_ptr) {
// does the klass have any local variable information?
InstanceKlass* ik = method->method_holder(); if (!ik->access_flags().has_localvariable_table()) { return (JVMTI_ERROR_ABSENT_INFORMATION);
}
// in the vm localvariable table representation, 6 consecutive elements in the table // represent a 6-tuple of shorts // [start_pc, length, name_index, descriptor_index, signature_index, index]
jint num_entries = method->localvariable_table_length();
jvmtiLocalVariableEntry *jvmti_table = (jvmtiLocalVariableEntry *)
jvmtiMalloc(num_entries * (sizeof(jvmtiLocalVariableEntry)));
if (num_entries > 0) {
LocalVariableTableElement* table = method->localvariable_table_start(); for (int i = 0; i < num_entries; i++) { // get the 5 tuple information from the vm table
jlocation start_location = (jlocation) table[i].start_bci;
jint length = (jint) table[i].length; int name_index = (int) table[i].name_cp_index; int signature_index = (int) table[i].descriptor_cp_index; int generic_signature_index = (int) table[i].signature_cp_index;
jint slot = (jint) table[i].slot;
// get utf8 name and signature char *name_buf = NULL; char *sig_buf = NULL; char *gen_sig_buf = NULL;
{
ResourceMark rm(current_thread);
// fill in the jvmti local variable table
jvmti_table[i].start_location = start_location;
jvmti_table[i].length = length;
jvmti_table[i].name = name_buf;
jvmti_table[i].signature = sig_buf;
jvmti_table[i].generic_signature = gen_sig_buf;
jvmti_table[i].slot = slot;
}
}
// set results
(*entry_count_ptr) = num_entries;
(*table_ptr) = jvmti_table;
return JVMTI_ERROR_NONE;
} /* end GetLocalVariableTable */
// method - pre-checked for validity, but may be NULL meaning obsolete method // bytecode_count_ptr - pre-checked for NULL // bytecodes_ptr - pre-checked for NULL
jvmtiError
JvmtiEnv::GetBytecodes(Method* method, jint* bytecode_count_ptr, unsignedchar** bytecodes_ptr) {
NULL_CHECK(method, JVMTI_ERROR_INVALID_METHODID);
(*bytecode_count_ptr) = size; // get byte codes
JvmtiClassFileReconstituter::copy_bytecodes(mh, *bytecodes_ptr);
return JVMTI_ERROR_NONE;
} /* end GetBytecodes */
// method - pre-checked for validity, but may be NULL meaning obsolete method // is_native_ptr - pre-checked for NULL
jvmtiError
JvmtiEnv::IsMethodNative(Method* method, jboolean* is_native_ptr) {
NULL_CHECK(method, JVMTI_ERROR_INVALID_METHODID);
(*is_native_ptr) = method->is_native(); return JVMTI_ERROR_NONE;
} /* end IsMethodNative */
// method - pre-checked for validity, but may be NULL meaning obsolete method // is_synthetic_ptr - pre-checked for NULL
jvmtiError
JvmtiEnv::IsMethodSynthetic(Method* method, jboolean* is_synthetic_ptr) {
NULL_CHECK(method, JVMTI_ERROR_INVALID_METHODID);
(*is_synthetic_ptr) = method->is_synthetic(); return JVMTI_ERROR_NONE;
} /* end IsMethodSynthetic */
// method - pre-checked for validity, but may be NULL meaning obsolete method // is_obsolete_ptr - pre-checked for NULL
jvmtiError
JvmtiEnv::IsMethodObsolete(Method* method, jboolean* is_obsolete_ptr) { if (use_version_1_0_semantics() &&
get_capabilities()->can_redefine_classes == 0) { // This JvmtiEnv requested version 1.0 semantics and this function // requires the can_redefine_classes capability in version 1.0 so // we need to return an error here. return JVMTI_ERROR_MUST_POSSESS_CAPABILITY;
}
// name - pre-checked for NULL // monitor_ptr - pre-checked for NULL
jvmtiError
JvmtiEnv::CreateRawMonitor(constchar* name, jrawMonitorID* monitor_ptr) {
JvmtiRawMonitor* rmonitor = new JvmtiRawMonitor(name);
NULL_CHECK(rmonitor, JVMTI_ERROR_OUT_OF_MEMORY);
*monitor_ptr = (jrawMonitorID)rmonitor;
return JVMTI_ERROR_NONE;
} /* end CreateRawMonitor */
// rmonitor - pre-checked for validity
jvmtiError
JvmtiEnv::DestroyRawMonitor(JvmtiRawMonitor * rmonitor) { if (Threads::number_of_threads() == 0) { // Remove this monitor from pending raw monitors list // if it has entered in onload or start phase.
JvmtiPendingMonitors::destroy(rmonitor);
} else {
Thread* thread = Thread::current(); if (rmonitor->owner() == thread) { // The caller owns this monitor which we are about to destroy. // We exit the underlying synchronization object so that the // "delete monitor" call below can work without an assertion // failure on systems that don't like destroying synchronization // objects that are locked. int r; int recursion = rmonitor->recursions(); for (int i = 0; i <= recursion; i++) {
r = rmonitor->raw_exit(thread);
assert(r == JvmtiRawMonitor::M_OK, "raw_exit should have worked"); if (r != JvmtiRawMonitor::M_OK) { // robustness return JVMTI_ERROR_INTERNAL;
}
}
} if (rmonitor->owner() != NULL) { // The caller is trying to destroy a monitor that is locked by // someone else. While this is not forbidden by the JVMTI // spec, it will cause an assertion failure on systems that don't // like destroying synchronization objects that are locked. // We indicate a problem with the error return (and leak the // monitor's memory). return JVMTI_ERROR_NOT_MONITOR_OWNER;
}
}
delete rmonitor;
return JVMTI_ERROR_NONE;
} /* end DestroyRawMonitor */
// rmonitor - pre-checked for validity
jvmtiError
JvmtiEnv::RawMonitorEnter(JvmtiRawMonitor * rmonitor) { if (Threads::number_of_threads() == 0) { // No JavaThreads exist so JvmtiRawMonitor enter cannot be // used, add this raw monitor to the pending list. // The pending monitors will be actually entered when // the VM is setup. // See transition_pending_raw_monitors in create_vm() // in thread.cpp.
JvmtiPendingMonitors::enter(rmonitor);
} else {
Thread* thread = Thread::current(); // 8266889: raw_enter changes Java thread state, needs WXWrite
MACOS_AARCH64_ONLY(ThreadWXEnable __wx(WXWrite, thread));
rmonitor->raw_enter(thread);
} return JVMTI_ERROR_NONE;
} /* end RawMonitorEnter */
if (Threads::number_of_threads() == 0) { // No JavaThreads exist so just remove this monitor from the pending list. // Bool value from exit is false if rmonitor is not in the list. if (!JvmtiPendingMonitors::exit(rmonitor)) {
err = JVMTI_ERROR_NOT_MONITOR_OWNER;
}
} else {
Thread* thread = Thread::current(); int r = rmonitor->raw_exit(thread); if (r == JvmtiRawMonitor::M_ILLEGAL_MONITOR_STATE) {
err = JVMTI_ERROR_NOT_MONITOR_OWNER;
}
} return err;
} /* end RawMonitorExit */
switch (r) { case JvmtiRawMonitor::M_INTERRUPTED: return JVMTI_ERROR_INTERRUPT; case JvmtiRawMonitor::M_ILLEGAL_MONITOR_STATE: return JVMTI_ERROR_NOT_MONITOR_OWNER; default: return JVMTI_ERROR_NONE;
}
} /* end RawMonitorWait */
// rmonitor - pre-checked for validity
jvmtiError
JvmtiEnv::RawMonitorNotify(JvmtiRawMonitor * rmonitor) {
Thread* thread = Thread::current(); int r = rmonitor->raw_notify(thread);
if (r == JvmtiRawMonitor::M_ILLEGAL_MONITOR_STATE) { return JVMTI_ERROR_NOT_MONITOR_OWNER;
} return JVMTI_ERROR_NONE;
} /* end RawMonitorNotify */
// rmonitor - pre-checked for validity
jvmtiError
JvmtiEnv::RawMonitorNotifyAll(JvmtiRawMonitor * rmonitor) {
Thread* thread = Thread::current(); int r = rmonitor->raw_notifyAll(thread);
if (r == JvmtiRawMonitor::M_ILLEGAL_MONITOR_STATE) { return JVMTI_ERROR_NOT_MONITOR_OWNER;
} return JVMTI_ERROR_NONE;
} /* end RawMonitorNotifyAll */
// // JNI Function Interception functions //
// function_table - pre-checked for NULL
jvmtiError
JvmtiEnv::SetJNIFunctionTable(const jniNativeInterface* function_table) { // Copy jni function table at safepoint.
VM_JNIFunctionTableCopier copier(function_table);
VMThread::execute(&copier);
return JVMTI_ERROR_NONE;
} /* end SetJNIFunctionTable */
// function_table - pre-checked for NULL
jvmtiError
JvmtiEnv::GetJNIFunctionTable(jniNativeInterface** function_table) {
*function_table=(jniNativeInterface*)jvmtiMalloc(sizeof(jniNativeInterface)); if (*function_table == NULL) return JVMTI_ERROR_OUT_OF_MEMORY;
memcpy(*function_table,(JavaThread::current())->get_jni_functions(),sizeof(jniNativeInterface)); return JVMTI_ERROR_NONE;
} /* end GetJNIFunctionTable */
// // Event Management functions //
jvmtiError
JvmtiEnv::GenerateEvents(jvmtiEvent event_type) { // can only generate two event types if (event_type != JVMTI_EVENT_COMPILED_METHOD_LOAD &&
event_type != JVMTI_EVENT_DYNAMIC_CODE_GENERATED) { return JVMTI_ERROR_ILLEGAL_ARGUMENT;
}
// for compiled_method_load events we must check that the environment // has the can_generate_compiled_method_load_events capability. if (event_type == JVMTI_EVENT_COMPILED_METHOD_LOAD) { if (get_capabilities()->can_generate_compiled_method_load_events == 0) { return JVMTI_ERROR_MUST_POSSESS_CAPABILITY;
} return JvmtiCodeBlobEvents::generate_compiled_method_load_events(this);
} else { return JvmtiCodeBlobEvents::generate_dynamic_code_events(this);
}
} /* end GenerateEvents */
// // Extension Mechanism functions //
// extension_count_ptr - pre-checked for NULL // extensions - pre-checked for NULL
jvmtiError
JvmtiEnv::GetExtensionFunctions(jint* extension_count_ptr, jvmtiExtensionFunctionInfo** extensions) { return JvmtiExtensions::get_functions(this, extension_count_ptr, extensions);
} /* end GetExtensionFunctions */
// extension_count_ptr - pre-checked for NULL // extensions - pre-checked for NULL
jvmtiError
JvmtiEnv::GetExtensionEvents(jint* extension_count_ptr, jvmtiExtensionEventInfo** extensions) { return JvmtiExtensions::get_events(this, extension_count_ptr, extensions);
} /* end GetExtensionEvents */
// callback - NULL is a valid value, must be checked
jvmtiError
JvmtiEnv::SetExtensionEventCallback(jint extension_event_index, jvmtiExtensionEvent callback) { return JvmtiExtensions::set_event_callback(this, extension_event_index, callback);
} /* end SetExtensionEventCallback */
// // Timers functions //
// info_ptr - pre-checked for NULL
jvmtiError
JvmtiEnv::GetCurrentThreadCpuTimerInfo(jvmtiTimerInfo* info_ptr) {
os::current_thread_cpu_time_info(info_ptr); return JVMTI_ERROR_NONE;
} /* end GetCurrentThreadCpuTimerInfo */
// Surprisingly the GetCurrentThreadCpuTime is used by non-JavaThread's. if (thread->is_Java_thread()) { if (JavaThread::cast(thread)->is_vthread_mounted()) { // No support for virtual threads (yet). return JVMTI_ERROR_UNSUPPORTED_OPERATION;
}
}
*nanos_ptr = os::current_thread_cpu_time(); return JVMTI_ERROR_NONE;
} /* end GetCurrentThreadCpuTime */
// info_ptr - pre-checked for NULL
jvmtiError
JvmtiEnv::GetThreadCpuTimerInfo(jvmtiTimerInfo* info_ptr) {
os::thread_cpu_time_info(info_ptr); return JVMTI_ERROR_NONE;
} /* end GetThreadCpuTimerInfo */
// Return JVMTI_ERROR_NOT_AVAILABLE if property is not readable or doesn't exist.
value = Arguments::PropertyList_get_readable_value(Arguments::system_properties(), property); if (value == NULL) {
err = JVMTI_ERROR_NOT_AVAILABLE;
} else {
err = allocate((strlen(value)+1) * sizeof(char), (unsignedchar **)value_ptr); if (err == JVMTI_ERROR_NONE) {
strcpy(*value_ptr, value);
}
} return err;
} /* end GetSystemProperty */
// property - pre-checked for NULL // value - NULL is a valid value, must be checked
jvmtiError
JvmtiEnv::SetSystemProperty(constchar* property, constchar* value_ptr) { for (SystemProperty* p = Arguments::system_properties(); p != NULL; p = p->next()) { if (strcmp(property, p->key()) == 0) { if (p->writeable()) { if (p->set_value(value_ptr, AllocFailStrategy::RETURN_NULL)) { return JVMTI_ERROR_NONE;
} else { return JVMTI_ERROR_OUT_OF_MEMORY;
}
} else { // We found a property, but it's not writeable return JVMTI_ERROR_NOT_AVAILABLE;
}
}
}
// We cannot find a property of the given name return JVMTI_ERROR_NOT_AVAILABLE;
} /* end SetSystemProperty */
Messung V0.5 in Prozent
¤ Dauer der Verarbeitung: 0.46 Sekunden
(vorverarbeitet am 2026-05-02)
¤
Die Informationen auf dieser Webseite wurden
nach bestem Wissen sorgfältig zusammengestellt. Es wird jedoch weder Vollständigkeit, noch Richtigkeit,
noch Qualität der bereit gestellten Informationen zugesichert.
Bemerkung:
Die farbliche Syntaxdarstellung und die Messung sind noch experimentell.
