/* * Copyright (c) 2003, 2020, 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. * */ #include "precompiled.hpp" #include "classfile/classLoaderExt.hpp" #include "classfile/javaClasses.inline.hpp" #include "classfile/stringTable.hpp" #include "classfile/modules.hpp" #include "classfile/systemDictionary.hpp" #include "classfile/vmSymbols.hpp" #include "interpreter/bytecodeStream.hpp" #include "interpreter/interpreter.hpp" #include "jfr/jfrEvents.hpp" #include "jvmtifiles/jvmtiEnv.hpp" #include "logging/log.hpp" #include "logging/logConfiguration.hpp" #include "memory/resourceArea.hpp" #include "memory/universe.hpp" #include "oops/instanceKlass.hpp" #include "oops/objArrayOop.inline.hpp" #include "oops/oop.inline.hpp" #include "prims/jniCheck.hpp" #include "prims/jvm_misc.hpp" #include "prims/jvmtiAgentThread.hpp" #include "prims/jvmtiClassFileReconstituter.hpp" #include "prims/jvmtiCodeBlobEvents.hpp" #include "prims/jvmtiExtensions.hpp" #include "prims/jvmtiGetLoadedClasses.hpp" #include "prims/jvmtiImpl.hpp" #include "prims/jvmtiManageCapabilities.hpp" #include "prims/jvmtiRawMonitor.hpp" #include "prims/jvmtiRedefineClasses.hpp" #include "prims/jvmtiTagMap.hpp" #include "prims/jvmtiThreadState.inline.hpp" #include "prims/jvmtiUtil.hpp" #include "runtime/arguments.hpp" #include "runtime/deoptimization.hpp" #include "runtime/fieldDescriptor.inline.hpp" #include "runtime/handles.inline.hpp" #include "runtime/interfaceSupport.inline.hpp" #include "runtime/javaCalls.hpp" #include "runtime/jfieldIDWorkaround.hpp" #include "runtime/jniHandles.inline.hpp" #include "runtime/objectMonitor.inline.hpp" #include "runtime/osThread.hpp" #include "runtime/reflectionUtils.hpp" #include "runtime/signature.hpp" #include "runtime/thread.inline.hpp" #include "runtime/threadHeapSampler.hpp" #include "runtime/threadSMR.hpp" #include "runtime/timerTrace.hpp" #include "runtime/vframe.inline.hpp" #include "runtime/vmThread.hpp" #include "services/threadService.hpp" #include "utilities/exceptions.hpp" #include "utilities/preserveException.hpp" #include "utilities/utf8.hpp" #define FIXLATER 0 // REMOVE this when completed. // FIXLATER: hook into JvmtiTrace #define TraceJVMTICalls false JvmtiEnv::JvmtiEnv(jint version) : JvmtiEnvBase(version) { } JvmtiEnv::~JvmtiEnv() { } JvmtiEnv* JvmtiEnv::create_a_jvmti(jint version) { return new JvmtiEnv(version); } // 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: const struct JNINativeInterface_ *_function_table; public: VM_JNIFunctionTableCopier(const struct JNINativeInterface_ *func_tbl) { _function_table = func_tbl; }; VMOp_Type type() const { return VMOp_JNIFunctionTableCopier; } void doit() { copy_jni_function_table(_function_table); }; }; // // 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, unsigned char** mem_ptr) { return allocate(size, mem_ptr); } /* end Allocate */ // mem - NULL is a valid value, must be checked jvmtiError JvmtiEnv::Deallocate(unsigned char* mem) { return deallocate(mem); } /* end Deallocate */ // Threads_lock NOT held, java_thread not protected by lock // java_thread - pre-checked // data - NULL is a valid value, must be checked jvmtiError JvmtiEnv::SetThreadLocalStorage(JavaThread* java_thread, const void* data) { JvmtiThreadState* state = java_thread->jvmti_thread_state(); if (state == NULL) { if (data == NULL) { // leaving state unset same as data set to NULL return JVMTI_ERROR_NONE; } // otherwise, create the state state = JvmtiThreadState::state_for(java_thread); 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 */ // Threads_lock NOT held // thread - 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. ThreadInVMfromNative __tiv(current_thread); VM_ENTRY_BASE(jvmtiError, JvmtiEnv::GetThreadLocalStorage , current_thread) debug_only(VMNativeEntryWrapper __vew;) JavaThread* java_thread = NULL; ThreadsListHandle tlh(current_thread); jvmtiError err = JvmtiExport::cv_external_thread_to_JavaThread(tlh.list(), thread, &java_thread, NULL); if (err != JVMTI_ERROR_NONE) { return err; } JvmtiThreadState* state = java_thread->jvmti_thread_state(); *data_ptr = (state == NULL) ? NULL : state->env_thread_state(this)->get_agent_thread_local_storage_data(); } return JVMTI_ERROR_NONE; } /* end GetThreadLocalStorage */ // // Module functions // // module_count_ptr - pre-checked for NULL // modules_ptr - pre-checked for NULL jvmtiError JvmtiEnv::GetAllModules(jint* module_count_ptr, jobject** modules_ptr) { JvmtiModuleClosure jmc; return jmc.get_all_modules(this, module_count_ptr, modules_ptr); } /* end GetAllModules */ // class_loader - NULL is a valid value, must be pre-checked // package_name - pre-checked for NULL // module_ptr - pre-checked for NULL jvmtiError JvmtiEnv::GetNamedModule(jobject class_loader, const char* package_name, jobject* module_ptr) { JavaThread* THREAD = JavaThread::current(); // pass to macros ResourceMark rm(THREAD); Handle h_loader (THREAD, JNIHandles::resolve(class_loader)); // Check that loader is a subclass of java.lang.ClassLoader. if (h_loader.not_null() && !java_lang_ClassLoader::is_subclass(h_loader->klass())) { return JVMTI_ERROR_ILLEGAL_ARGUMENT; } jobject module = Modules::get_named_module(h_loader, package_name, THREAD); if (HAS_PENDING_EXCEPTION) { CLEAR_PENDING_EXCEPTION; return JVMTI_ERROR_INTERNAL; // unexpected exception } *module_ptr = module; return JVMTI_ERROR_NONE; } /* end GetNamedModule */ // module - pre-checked for NULL // to_module - pre-checked for NULL jvmtiError JvmtiEnv::AddModuleReads(jobject module, jobject to_module) { JavaThread* THREAD = JavaThread::current(); // check module Handle h_module(THREAD, JNIHandles::resolve(module)); if (!java_lang_Module::is_instance(h_module())) { return JVMTI_ERROR_INVALID_MODULE; } // check to_module Handle h_to_module(THREAD, JNIHandles::resolve(to_module)); if (!java_lang_Module::is_instance(h_to_module())) { return JVMTI_ERROR_INVALID_MODULE; } return JvmtiExport::add_module_reads(h_module, h_to_module, THREAD); } /* end AddModuleReads */ // module - pre-checked for NULL // pkg_name - pre-checked for NULL // to_module - pre-checked for NULL jvmtiError JvmtiEnv::AddModuleExports(jobject module, const char* pkg_name, jobject to_module) { JavaThread* THREAD = JavaThread::current(); Handle h_pkg = java_lang_String::create_from_str(pkg_name, THREAD); // check module Handle h_module(THREAD, JNIHandles::resolve(module)); if (!java_lang_Module::is_instance(h_module())) { return JVMTI_ERROR_INVALID_MODULE; } // check to_module Handle h_to_module(THREAD, JNIHandles::resolve(to_module)); if (!java_lang_Module::is_instance(h_to_module())) { return JVMTI_ERROR_INVALID_MODULE; } return JvmtiExport::add_module_exports(h_module, h_pkg, h_to_module, THREAD); } /* end AddModuleExports */ // module - pre-checked for NULL // pkg_name - pre-checked for NULL // to_module - pre-checked for NULL jvmtiError JvmtiEnv::AddModuleOpens(jobject module, const char* pkg_name, jobject to_module) { JavaThread* THREAD = JavaThread::current(); Handle h_pkg = java_lang_String::create_from_str(pkg_name, THREAD); // check module Handle h_module(THREAD, JNIHandles::resolve(module)); if (!java_lang_Module::is_instance(h_module())) { return JVMTI_ERROR_INVALID_MODULE; } // check to_module Handle h_to_module(THREAD, JNIHandles::resolve(to_module)); if (!java_lang_Module::is_instance(h_to_module())) { return JVMTI_ERROR_INVALID_MODULE; } return JvmtiExport::add_module_opens(h_module, h_pkg, h_to_module, THREAD); } /* end AddModuleOpens */ // module - pre-checked for NULL // service - pre-checked for NULL jvmtiError JvmtiEnv::AddModuleUses(jobject module, jclass service) { JavaThread* THREAD = JavaThread::current(); // check module Handle h_module(THREAD, JNIHandles::resolve(module)); if (!java_lang_Module::is_instance(h_module())) { return JVMTI_ERROR_INVALID_MODULE; } // check service Handle h_service(THREAD, JNIHandles::resolve_external_guard(service)); if (!java_lang_Class::is_instance(h_service()) || java_lang_Class::is_primitive(h_service())) { return JVMTI_ERROR_INVALID_CLASS; } return JvmtiExport::add_module_uses(h_module, h_service, THREAD); } /* end AddModuleUses */ // module - pre-checked for NULL // service - pre-checked for NULL // impl_class - pre-checked for NULL jvmtiError JvmtiEnv::AddModuleProvides(jobject module, jclass service, jclass impl_class) { JavaThread* THREAD = JavaThread::current(); // check module Handle h_module(THREAD, JNIHandles::resolve(module)); if (!java_lang_Module::is_instance(h_module())) { return JVMTI_ERROR_INVALID_MODULE; } // check service Handle h_service(THREAD, JNIHandles::resolve_external_guard(service)); if (!java_lang_Class::is_instance(h_service()) || java_lang_Class::is_primitive(h_service())) { return JVMTI_ERROR_INVALID_CLASS; } // check impl_class Handle h_impl_class(THREAD, JNIHandles::resolve_external_guard(impl_class)); if (!java_lang_Class::is_instance(h_impl_class()) || java_lang_Class::is_primitive(h_impl_class())) { return JVMTI_ERROR_INVALID_CLASS; } return JvmtiExport::add_module_provides(h_module, h_service, h_impl_class, THREAD); } /* end AddModuleProvides */ // module - pre-checked for NULL // is_modifiable_class_ptr - pre-checked for NULL jvmtiError JvmtiEnv::IsModifiableModule(jobject module, jboolean* is_modifiable_module_ptr) { JavaThread* THREAD = JavaThread::current(); // check module Handle h_module(THREAD, JNIHandles::resolve(module)); if (!java_lang_Module::is_instance(h_module())) { return JVMTI_ERROR_INVALID_MODULE; } *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); jvmtiClassDefinition* class_definitions = NEW_RESOURCE_ARRAY(jvmtiClassDefinition, class_count); NULL_CHECK(class_definitions, JVMTI_ERROR_OUT_OF_MEMORY); for (index = 0; index < class_count; index++) { HandleMark hm(current_thread); jclass jcls = classes[index]; oop k_mirror = JNIHandles::resolve_external_guard(jcls); if (k_mirror == NULL) { return JVMTI_ERROR_INVALID_CLASS; } if (!k_mirror->is_a(SystemDictionary::Class_klass())) { return JVMTI_ERROR_INVALID_CLASS; } 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 = (unsigned char*) 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 */ // // Object functions // // size_ptr - pre-checked for NULL jvmtiError JvmtiEnv::GetObjectSize(jobject object, jlong* size_ptr) { oop mirror = JNIHandles::resolve_external_guard(object); NULL_CHECK(mirror, JVMTI_ERROR_INVALID_OBJECT); *size_ptr = (jlong)Universe::heap()->obj_size(mirror) * wordSize; return JVMTI_ERROR_NONE; } /* end GetObjectSize */ // // Method functions // // prefix - NULL is a valid value, must be checked jvmtiError JvmtiEnv::SetNativeMethodPrefix(const char* 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) { 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, ...) { 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. // event_type must be valid if (!JvmtiEventController::is_valid_event_type(event_type)) { return JVMTI_ERROR_INVALID_EVENT_TYPE; } bool enabled = (mode == JVMTI_ENABLE); // assure that needed capabilities are present if (enabled && !JvmtiUtil::has_event_capability(event_type, get_capabilities())) { return JVMTI_ERROR_MUST_POSSESS_CAPABILITY; } if (event_type == JVMTI_EVENT_CLASS_FILE_LOAD_HOOK && enabled) { record_class_file_load_hook_enabled(); } JvmtiEventController::set_user_enabled(this, (JavaThread*) NULL, event_type, enabled); } else { // We have a specified event_thread. JavaThread* java_thread = NULL; ThreadsListHandle tlh; jvmtiError err = JvmtiExport::cv_external_thread_to_JavaThread(tlh.list(), event_thread, &java_thread, NULL); if (err != JVMTI_ERROR_NONE) { return err; } // event_type must be valid if (!JvmtiEventController::is_valid_event_type(event_type)) { return JVMTI_ERROR_INVALID_EVENT_TYPE; } // global events cannot be controlled at thread level. if (JvmtiEventController::is_global_event(event_type)) { return JVMTI_ERROR_ILLEGAL_ARGUMENT; } bool enabled = (mode == JVMTI_ENABLE); // assure that needed capabilities are present if (enabled && !JvmtiUtil::has_event_capability(event_type, get_capabilities())) { return JVMTI_ERROR_MUST_POSSESS_CAPABILITY; } if (event_type == JVMTI_EVENT_CLASS_FILE_LOAD_HOOK && enabled) { record_class_file_load_hook_enabled(); } JvmtiEventController::set_user_enabled(this, java_thread, event_type, enabled); } return JVMTI_ERROR_NONE; } /* end SetEventNotificationMode */ // // Capability functions // // capabilities_ptr - pre-checked for NULL jvmtiError JvmtiEnv::GetPotentialCapabilities(jvmtiCapabilities* capabilities_ptr) { JvmtiManageCapabilities::get_potential_capabilities(get_capabilities(), get_prohibited_capabilities(), capabilities_ptr); return JVMTI_ERROR_NONE; } /* end GetPotentialCapabilities */ // capabilities_ptr - pre-checked for NULL jvmtiError JvmtiEnv::AddCapabilities(const jvmtiCapabilities* capabilities_ptr) { return JvmtiManageCapabilities::add_capabilities(get_capabilities(), get_prohibited_capabilities(), capabilities_ptr, get_capabilities()); } /* end AddCapabilities */ // capabilities_ptr - pre-checked for NULL jvmtiError JvmtiEnv::RelinquishCapabilities(const jvmtiCapabilities* capabilities_ptr) { JvmtiManageCapabilities::relinquish_capabilities(get_capabilities(), capabilities_ptr, get_capabilities()); return JVMTI_ERROR_NONE; } /* end RelinquishCapabilities */ // 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(const char* segment) { jvmtiPhase phase = get_phase(); if (phase == JVMTI_PHASE_ONLOAD) { Arguments::append_sysclasspath(segment); return JVMTI_ERROR_NONE; } else if (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; } else if (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; } // lock the loader Thread* thread = Thread::current(); HandleMark hm; Handle loader_lock = Handle(thread, SystemDictionary::system_loader_lock()); ObjectLocker ol(loader_lock, thread); // 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; } } /* end AddToBootstrapClassLoaderSearch */ // segment - pre-checked for NULL jvmtiError JvmtiEnv::AddToSystemClassLoaderSearch(const char* segment) { jvmtiPhase phase = get_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; } else if (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. HandleMark hm; // 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 // lock the loader Thread* THREAD = Thread::current(); Handle loader = Handle(THREAD, SystemDictionary::java_system_loader()); ObjectLocker ol(loader, THREAD); // 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; if (ex_name == vmSymbols::java_lang_NoSuchMethodError()) { return JVMTI_ERROR_CLASS_LOADER_UNSUPPORTED; } else { return JVMTI_ERROR_INTERNAL; } } } return JVMTI_ERROR_NONE; } else { return JVMTI_ERROR_WRONG_PHASE; } } /* end AddToSystemClassLoaderSearch */ // // General functions // // phase_ptr - pre-checked for NULL jvmtiError JvmtiEnv::GetPhase(jvmtiPhase* phase_ptr) { *phase_ptr = phase(); return JVMTI_ERROR_NONE; } /* end GetPhase */ jvmtiError JvmtiEnv::DisposeEnvironment() { dispose(); return JVMTI_ERROR_NONE; } /* end DisposeEnvironment */ // data - NULL is a valid value, must be checked jvmtiError JvmtiEnv::SetEnvironmentLocalStorage(const void* 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 */ // name_ptr - pre-checked for NULL jvmtiError JvmtiEnv::GetErrorName(jvmtiError error, char** name_ptr) { if (error < JVMTI_ERROR_NONE || error > JVMTI_ERROR_MAX) { return JVMTI_ERROR_ILLEGAL_ARGUMENT; } const char *name = JvmtiUtil::error_name(error); if (name == NULL) { return JVMTI_ERROR_ILLEGAL_ARGUMENT; } size_t len = strlen(name) + 1; jvmtiError err = allocate(len, (unsigned char**)name_ptr); if (err == JVMTI_ERROR_NONE) { memcpy(*name_ptr, name, len); } return err; } /* end GetErrorName */ 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 // // Threads_lock NOT held // thread - NOT pre-checked // thread_state_ptr - pre-checked for NULL jvmtiError JvmtiEnv::GetThreadState(jthread thread, jint* thread_state_ptr) { JavaThread* current_thread = JavaThread::current(); JavaThread* java_thread = NULL; oop thread_oop = NULL; ThreadsListHandle tlh(current_thread); if (thread == NULL) { java_thread = current_thread; thread_oop = java_thread->threadObj(); if (thread_oop == NULL || !thread_oop->is_a(SystemDictionary::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. if (thread_oop == NULL) { return err; } // We have a valid thread_oop so we can return some thread state. } } // get most state bits jint state = (jint)java_lang_Thread::get_thread_status(thread_oop); if (java_thread != NULL) { // We have a JavaThread* so add more state bits. JavaThreadState jts = java_thread->thread_state(); if (java_thread->is_being_ext_suspended()) { state |= JVMTI_THREAD_STATE_SUSPENDED; } if (jts == _thread_in_native) { state |= JVMTI_THREAD_STATE_IN_NATIVE; } if (java_thread->is_interrupted(false)) { state |= JVMTI_THREAD_STATE_INTERRUPTED; } } *thread_state_ptr = state; return JVMTI_ERROR_NONE; } /* end GetThreadState */ // thread_ptr - pre-checked for NULL jvmtiError JvmtiEnv::GetCurrentThread(jthread* thread_ptr) { JavaThread* current_thread = JavaThread::current(); *thread_ptr = (jthread)JNIHandles::make_local(current_thread, current_thread->threadObj()); return JVMTI_ERROR_NONE; } /* end GetCurrentThread */ // threads_count_ptr - pre-checked for NULL // threads_ptr - pre-checked for NULL jvmtiError JvmtiEnv::GetAllThreads(jint* threads_count_ptr, jthread** threads_ptr) { int nthreads = 0; Handle *thread_objs = NULL; ResourceMark rm; HandleMark hm; // enumerate threads (including agent threads) ThreadsListEnumerator tle(Thread::current(), true); nthreads = tle.num_threads(); *threads_count_ptr = nthreads; if (nthreads == 0) { *threads_ptr = NULL; return JVMTI_ERROR_NONE; } thread_objs = NEW_RESOURCE_ARRAY(Handle, nthreads); NULL_CHECK(thread_objs, JVMTI_ERROR_OUT_OF_MEMORY); for (int i = 0; i < nthreads; i++) { thread_objs[i] = Handle(tle.get_threadObj(i)); } jthread *jthreads = new_jthreadArray(nthreads, thread_objs); NULL_CHECK(jthreads, JVMTI_ERROR_OUT_OF_MEMORY); *threads_ptr = jthreads; return JVMTI_ERROR_NONE; } /* end GetAllThreads */ // Threads_lock NOT held, java_thread not protected by lock // java_thread - pre-checked jvmtiError JvmtiEnv::SuspendThread(JavaThread* java_thread) { // don't allow hidden thread suspend request. if (java_thread->is_hidden_from_external_view()) { return (JVMTI_ERROR_NONE); } { MutexLocker ml(java_thread->SR_lock(), Mutex::_no_safepoint_check_flag); if (java_thread->is_external_suspend()) { // don't allow nested external suspend requests. return (JVMTI_ERROR_THREAD_SUSPENDED); } if (java_thread->is_exiting()) { // thread is in the process of exiting return (JVMTI_ERROR_THREAD_NOT_ALIVE); } java_thread->set_external_suspend(); } if (!JvmtiSuspendControl::suspend(java_thread)) { // the thread was in the process of exiting return (JVMTI_ERROR_THREAD_NOT_ALIVE); } return JVMTI_ERROR_NONE; } /* 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) { int needSafepoint = 0; // > 0 if we need a safepoint ThreadsListHandle tlh; for (int i = 0; i < request_count; i++) { JavaThread *java_thread = NULL; jvmtiError err = JvmtiExport::cv_external_thread_to_JavaThread(tlh.list(), request_list[i], &java_thread, NULL); if (err != JVMTI_ERROR_NONE) { results[i] = err; continue; } // don't allow hidden thread suspend request. if (java_thread->is_hidden_from_external_view()) { results[i] = JVMTI_ERROR_NONE; // indicate successful suspend continue; } { MutexLocker ml(java_thread->SR_lock(), Mutex::_no_safepoint_check_flag); if (java_thread->is_external_suspend()) { // don't allow nested external suspend requests. results[i] = JVMTI_ERROR_THREAD_SUSPENDED; continue; } if (java_thread->is_exiting()) { // thread is in the process of exiting results[i] = JVMTI_ERROR_THREAD_NOT_ALIVE; continue; } java_thread->set_external_suspend(); } if (java_thread->thread_state() == _thread_in_native) { // We need to try and suspend native threads here. Threads in // other states will self-suspend on their next transition. if (!JvmtiSuspendControl::suspend(java_thread)) { // The thread was in the process of exiting. Force another // safepoint to make sure that this thread transitions. needSafepoint++; results[i] = JVMTI_ERROR_THREAD_NOT_ALIVE; continue; } } else { needSafepoint++; } results[i] = JVMTI_ERROR_NONE; // indicate successful suspend } if (needSafepoint > 0) { VM_ThreadsSuspendJVMTI tsj; VMThread::execute(&tsj); } // per-thread suspend results returned via results parameter return JVMTI_ERROR_NONE; } /* end SuspendThreadList */ // Threads_lock NOT held, java_thread not protected by lock // java_thread - pre-checked jvmtiError JvmtiEnv::ResumeThread(JavaThread* java_thread) { // don't allow hidden thread resume request. if (java_thread->is_hidden_from_external_view()) { return JVMTI_ERROR_NONE; } if (!java_thread->is_being_ext_suspended()) { return JVMTI_ERROR_THREAD_NOT_SUSPENDED; } if (!JvmtiSuspendControl::resume(java_thread)) { return JVMTI_ERROR_INTERNAL; } return JVMTI_ERROR_NONE; } /* end ResumeThread */ // 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) { ThreadsListHandle tlh; for (int i = 0; i < request_count; i++) { JavaThread* java_thread = NULL; jvmtiError err = JvmtiExport::cv_external_thread_to_JavaThread(tlh.list(), request_list[i], &java_thread, NULL); if (err != JVMTI_ERROR_NONE) { results[i] = err; continue; } // don't allow hidden thread resume request. if (java_thread->is_hidden_from_external_view()) { results[i] = JVMTI_ERROR_NONE; // indicate successful resume continue; } if (!java_thread->is_being_ext_suspended()) { results[i] = JVMTI_ERROR_THREAD_NOT_SUSPENDED; continue; } if (!JvmtiSuspendControl::resume(java_thread)) { results[i] = JVMTI_ERROR_INTERNAL; continue; } results[i] = JVMTI_ERROR_NONE; // indicate successful resume } // per-thread resume results returned via results parameter return JVMTI_ERROR_NONE; } /* end ResumeThreadList */ // Threads_lock NOT held, java_thread not protected by lock // java_thread - pre-checked jvmtiError JvmtiEnv::StopThread(JavaThread* java_thread, jobject exception) { oop e = JNIHandles::resolve_external_guard(exception); NULL_CHECK(e, JVMTI_ERROR_NULL_POINTER); JavaThread::send_async_exception(java_thread->threadObj(), e); return JVMTI_ERROR_NONE; } /* end StopThread */ // Threads_lock NOT held // thread - NOT pre-checked jvmtiError JvmtiEnv::InterruptThread(jthread thread) { JavaThread* current_thread = JavaThread::current(); JavaThread* java_thread = NULL; ThreadsListHandle tlh(current_thread); jvmtiError err = JvmtiExport::cv_external_thread_to_JavaThread(tlh.list(), thread, &java_thread, NULL); if (err != JVMTI_ERROR_NONE) { return err; } // 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(JNIHandles::resolve(thread), true); java_thread->interrupt(); return JVMTI_ERROR_NONE; } /* end InterruptThread */ // Threads_lock NOT held // thread - NOT pre-checked // info_ptr - pre-checked for NULL jvmtiError JvmtiEnv::GetThreadInfo(jthread thread, jvmtiThreadInfo* info_ptr) { ResourceMark rm; HandleMark hm; JavaThread* current_thread = JavaThread::current(); ThreadsListHandle tlh(current_thread); // if thread is NULL the current thread is used oop thread_oop = NULL; if (thread == NULL) { thread_oop = current_thread->threadObj(); if (thread_oop == NULL || !thread_oop->is_a(SystemDictionary::Thread_klass())) { return JVMTI_ERROR_INVALID_THREAD; } } else { JavaThread* java_thread = NULL; 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 so we can return some thread info. } } Handle thread_obj(current_thread, thread_oop); Handle name; ThreadPriority priority; Handle thread_group; Handle context_class_loader; bool is_daemon; name = Handle(current_thread, java_lang_Thread::name(thread_obj())); priority = java_lang_Thread::priority(thread_obj()); thread_group = Handle(current_thread, java_lang_Thread::threadGroup(thread_obj())); is_daemon = java_lang_Thread::is_daemon(thread_obj()); oop loader = java_lang_Thread::context_class_loader(thread_obj()); context_class_loader = Handle(current_thread, loader); { const char *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); } info_ptr->name = (char *) jvmtiMalloc(strlen(n)+1); if (info_ptr->name == NULL) return JVMTI_ERROR_OUT_OF_MEMORY; strcpy(info_ptr->name, n); } info_ptr->is_daemon = is_daemon; info_ptr->priority = priority; info_ptr->context_class_loader = (context_class_loader.is_null()) ? NULL : jni_reference(context_class_loader); info_ptr->thread_group = jni_reference(thread_group); return JVMTI_ERROR_NONE; } /* end GetThreadInfo */ // Threads_lock NOT held, java_thread not protected by lock // java_thread - pre-checked // owned_monitor_count_ptr - pre-checked for NULL // owned_monitors_ptr - pre-checked for NULL jvmtiError JvmtiEnv::GetOwnedMonitorInfo(JavaThread* java_thread, jint* owned_monitor_count_ptr, jobject** owned_monitors_ptr) { jvmtiError err = JVMTI_ERROR_NONE; JavaThread* calling_thread = JavaThread::current(); // growable array of jvmti monitors info on the C-heap GrowableArray *owned_monitors_list = new (ResourceObj::C_HEAP, mtServiceability) GrowableArray(1, mtServiceability); // 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 == calling_thread) { 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); bool executed = Handshake::execute_direct(&op, java_thread); err = executed ? op.result() : JVMTI_ERROR_THREAD_NOT_ALIVE; } jint owned_monitor_count = owned_monitors_list->length(); if (err == JVMTI_ERROR_NONE) { if ((err = allocate(owned_monitor_count * sizeof(jobject *), (unsigned char**)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((unsigned char*)owned_monitors_list->at(i)); } delete owned_monitors_list; return err; } /* end GetOwnedMonitorInfo */ // Threads_lock NOT held, java_thread not protected by lock // java_thread - pre-checked // monitor_info_count_ptr - pre-checked for NULL // monitor_info_ptr - pre-checked for NULL jvmtiError JvmtiEnv::GetOwnedMonitorStackDepthInfo(JavaThread* java_thread, jint* monitor_info_count_ptr, jvmtiMonitorStackDepthInfo** monitor_info_ptr) { jvmtiError err = JVMTI_ERROR_NONE; JavaThread* calling_thread = JavaThread::current(); // growable array of jvmti monitors info on the C-heap GrowableArray *owned_monitors_list = new (ResourceObj::C_HEAP, mtServiceability) GrowableArray(1, mtServiceability); // 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 == calling_thread) { 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); bool executed = Handshake::execute_direct(&op, java_thread); err = executed ? op.result() : JVMTI_ERROR_THREAD_NOT_ALIVE; } jint owned_monitor_count = owned_monitors_list->length(); if (err == JVMTI_ERROR_NONE) { if ((err = allocate(owned_monitor_count * sizeof(jvmtiMonitorStackDepthInfo), (unsigned char**)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((unsigned char*)owned_monitors_list->at(i)); } delete owned_monitors_list; return err; } /* end GetOwnedMonitorStackDepthInfo */ // Threads_lock NOT held, java_thread not protected by lock // java_thread - pre-checked // monitor_ptr - pre-checked for NULL jvmtiError JvmtiEnv::GetCurrentContendedMonitor(JavaThread* java_thread, jobject* monitor_ptr) { jvmtiError err = JVMTI_ERROR_NONE; JavaThread* calling_thread = JavaThread::current(); // 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 == calling_thread) { err = get_current_contended_monitor(calling_thread, java_thread, monitor_ptr); } else { // get contended monitor information with handshake GetCurrentContendedMonitorClosure op(calling_thread, this, monitor_ptr); bool executed = Handshake::execute_direct(&op, java_thread); err = executed ? op.result() : JVMTI_ERROR_THREAD_NOT_ALIVE; } return err; } /* end GetCurrentContendedMonitor */ // Threads_lock NOT held // thread - NOT pre-checked // proc - pre-checked for NULL // arg - NULL is a valid value, must be checked jvmtiError JvmtiEnv::RunAgentThread(jthread thread, jvmtiStartFunction proc, const void* 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 (priority < JVMTI_THREAD_MIN_PRIORITY || priority > JVMTI_THREAD_MAX_PRIORITY) { return JVMTI_ERROR_INVALID_PRIORITY; } Handle thread_hndl(current_thread, thread_oop); { MutexLocker mu(current_thread, Threads_lock); // grab Threads_lock 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 memory. if (new_thread == NULL || new_thread->osthread() == NULL) { if (new_thread != NULL) { new_thread->smr_delete(); } return JVMTI_ERROR_OUT_OF_MEMORY; } java_lang_Thread::set_thread(thread_hndl(), new_thread); java_lang_Thread::set_priority(thread_hndl(), (ThreadPriority)priority); java_lang_Thread::set_daemon(thread_hndl()); new_thread->set_threadObj(thread_hndl()); Threads::add(new_thread); Thread::start(new_thread); } // unlock Threads_lock return JVMTI_ERROR_NONE; } /* end RunAgentThread */ // // Thread Group functions // // group_count_ptr - pre-checked for NULL // groups_ptr - pre-checked for NULL jvmtiError JvmtiEnv::GetTopThreadGroups(jint* group_count_ptr, jthreadGroup** groups_ptr) { JavaThread* current_thread = JavaThread::current(); // 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)); NULL_CHECK(*groups_ptr, JVMTI_ERROR_OUT_OF_MEMORY); // Convert oop to Handle, then convert Handle to global-ref. { HandleMark hm(current_thread); Handle system_thread_group(current_thread, Universe::system_thread_group()); *groups_ptr[0] = jni_reference(system_thread_group); } return JVMTI_ERROR_NONE; } /* end GetTopThreadGroups */ // info_ptr - pre-checked for NULL jvmtiError JvmtiEnv::GetThreadGroupInfo(jthreadGroup group, jvmtiThreadGroupInfo* info_ptr) { ResourceMark rm; HandleMark hm; JavaThread* current_thread = JavaThread::current(); Handle group_obj (current_thread, JNIHandles::resolve_external_guard(group)); NULL_CHECK(group_obj(), JVMTI_ERROR_INVALID_THREAD_GROUP); const char* name; Handle parent_group; bool is_daemon; ThreadPriority max_priority; name = java_lang_ThreadGroup::name(group_obj()); parent_group = Handle(current_thread, java_lang_ThreadGroup::parent(group_obj())); is_daemon = java_lang_ThreadGroup::is_daemon(group_obj()); max_priority = java_lang_ThreadGroup::maxPriority(group_obj()); info_ptr->is_daemon = is_daemon; info_ptr->max_priority = max_priority; info_ptr->parent = jni_reference(parent_group); if (name != NULL) { info_ptr->name = (char*)jvmtiMalloc(strlen(name)+1); NULL_CHECK(info_ptr->name, JVMTI_ERROR_OUT_OF_MEMORY); strcpy(info_ptr->name, name); } else { info_ptr->name = NULL; } return JVMTI_ERROR_NONE; } /* end GetThreadGroupInfo */ // thread_count_ptr - pre-checked for NULL // threads_ptr - pre-checked for NULL // group_count_ptr - pre-checked for NULL // groups_ptr - pre-checked for NULL jvmtiError JvmtiEnv::GetThreadGroupChildren(jthreadGroup group, jint* thread_count_ptr, jthread** threads_ptr, jint* group_count_ptr, jthreadGroup** groups_ptr) { JavaThread* current_thread = JavaThread::current(); oop group_obj = (oop) JNIHandles::resolve_external_guard(group); NULL_CHECK(group_obj, JVMTI_ERROR_INVALID_THREAD_GROUP); Handle *thread_objs = NULL; Handle *group_objs = NULL; int nthreads = 0; int ngroups = 0; int hidden_threads = 0; ResourceMark rm(current_thread); HandleMark hm(current_thread); Handle group_hdl(current_thread, group_obj); { // Cannot allow thread or group counts to change. ObjectLocker ol(group_hdl, current_thread); nthreads = java_lang_ThreadGroup::nthreads(group_hdl()); ngroups = java_lang_ThreadGroup::ngroups(group_hdl()); if (nthreads > 0) { ThreadsListHandle tlh(current_thread); objArrayOop threads = java_lang_ThreadGroup::threads(group_hdl()); assert(nthreads <= threads->length(), "too many threads"); thread_objs = NEW_RESOURCE_ARRAY(Handle,nthreads); for (int i = 0, j = 0; i < nthreads; i++) { oop thread_obj = threads->obj_at(i); assert(thread_obj != NULL, "thread_obj is NULL"); JavaThread *java_thread = NULL; jvmtiError err = JvmtiExport::cv_oop_to_JavaThread(tlh.list(), thread_obj, &java_thread); if (err == JVMTI_ERROR_NONE) { // Have a valid JavaThread*. if (java_thread->is_hidden_from_external_view()) { // Filter out hidden java threads. hidden_threads++; continue; } } else { // We couldn't convert thread_obj into a JavaThread*. if (err == JVMTI_ERROR_INVALID_THREAD) { // The thread_obj does not refer to a java.lang.Thread object // so skip it. hidden_threads++; continue; } // We have a valid thread_obj, but no JavaThread*; the caller // can still have limited use for the thread_obj. } thread_objs[j++] = Handle(current_thread, thread_obj); } nthreads -= hidden_threads; } // ThreadsListHandle is destroyed here. if (ngroups > 0) { objArrayOop groups = java_lang_ThreadGroup::groups(group_hdl()); assert(ngroups <= groups->length(), "too many groups"); group_objs = NEW_RESOURCE_ARRAY(Handle,ngroups); for (int i = 0; i < ngroups; i++) { oop group_obj = groups->obj_at(i); assert(group_obj != NULL, "group_obj != NULL"); group_objs[i] = Handle(current_thread, group_obj); } } } // ThreadGroup unlocked here *group_count_ptr = ngroups; *thread_count_ptr = nthreads; *threads_ptr = new_jthreadArray(nthreads, thread_objs); *groups_ptr = new_jthreadGroupArray(ngroups, group_objs); if ((nthreads > 0) && (*threads_ptr == NULL)) { return JVMTI_ERROR_OUT_OF_MEMORY; } if ((ngroups > 0) && (*groups_ptr == NULL)) { return JVMTI_ERROR_OUT_OF_MEMORY; } return JVMTI_ERROR_NONE; } /* end GetThreadGroupChildren */ // // Stack Frame functions // // Threads_lock NOT held, java_thread not protected by lock // java_thread - 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(JavaThread* java_thread, jint start_depth, jint max_frame_count, jvmtiFrameInfo* frame_buffer, jint* count_ptr) { jvmtiError err = JVMTI_ERROR_NONE; // 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); bool executed = Handshake::execute_direct(&op, java_thread); err = executed ? op.result() : JVMTI_ERROR_THREAD_NOT_ALIVE; } 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) { // Use direct handshake if we need to get only one stack trace. JavaThread *current_thread = JavaThread::current(); ThreadsListHandle tlh(current_thread); JavaThread *java_thread; err = JvmtiExport::cv_external_thread_to_JavaThread(tlh.list(), *thread_list, &java_thread, NULL); if (err != JVMTI_ERROR_NONE) { return err; } GetSingleStackTraceClosure op(this, current_thread, *thread_list, max_frame_count); bool executed = Handshake::execute_direct(&op, java_thread); err = executed ? op.result() : JVMTI_ERROR_THREAD_NOT_ALIVE; if (err == JVMTI_ERROR_NONE) { *stack_info_ptr = op.stack_info(); } } else { // JVMTI get stack traces at safepoint. VM_GetThreadListStackTraces op(this, thread_count, thread_list, max_frame_count); VMThread::execute(&op); err = op.result(); if (err == JVMTI_ERROR_NONE) { *stack_info_ptr = op.stack_info(); } } return err; } /* end GetThreadListStackTraces */ // Threads_lock NOT held, java_thread not protected by lock // java_thread - pre-checked // count_ptr - pre-checked for NULL jvmtiError JvmtiEnv::GetFrameCount(JavaThread* java_thread, jint* count_ptr) { jvmtiError err = JVMTI_ERROR_NONE; // retrieve or create JvmtiThreadState. JvmtiThreadState* state = JvmtiThreadState::state_for(java_thread); if (state == NULL) { return JVMTI_ERROR_THREAD_NOT_ALIVE; } // It is only safe to perform the direct operation on the current // thread. All other usage needs to use a vm-safepoint-op for safety. if (java_thread == JavaThread::current()) { err = get_frame_count(state, count_ptr); } else { // get java stack frame count at safepoint. VM_GetFrameCount op(this, state, count_ptr); VMThread::execute(&op); err = op.result(); } return err; } /* end GetFrameCount */ // Threads_lock NOT held, java_thread not protected by lock // java_thread - pre-checked jvmtiError JvmtiEnv::PopFrame(JavaThread* java_thread) { JavaThread* current_thread = JavaThread::current(); HandleMark hm(current_thread); uint32_t debug_bits = 0; // retrieve or create the state JvmtiThreadState* state = JvmtiThreadState::state_for(java_thread); if (state == NULL) { return JVMTI_ERROR_THREAD_NOT_ALIVE; } // Check if java_thread is fully suspended if (!java_thread->is_thread_fully_suspended(true /* wait for suspend completion */, &debug_bits)) { return JVMTI_ERROR_THREAD_NOT_SUSPENDED; } // Check to see if a PopFrame was already in progress if (java_thread->popframe_condition() != JavaThread::popframe_inactive) { // Probably possible for JVMTI clients to trigger this, but the // JPDA backend shouldn't allow this to happen return JVMTI_ERROR_INTERNAL; } { // Was workaround bug // 4812902: popFrame hangs if the method is waiting at a synchronize // Catch this condition and return an error to avoid hanging. // Now JVMTI spec allows an implementation to bail out with an opaque frame error. OSThread* osThread = java_thread->osthread(); if (osThread->get_state() == MONITOR_WAIT) { return JVMTI_ERROR_OPAQUE_FRAME; } } { ResourceMark rm(current_thread); // Check if there are more than one Java frame in this thread, that the top two frames // are Java (not native) frames, and that there is no intervening VM frame int frame_count = 0; bool is_interpreted[2]; intptr_t *frame_sp[2]; // The 2-nd arg of constructor is needed to stop iterating at java entry frame. for (vframeStream vfs(java_thread, true); !vfs.at_end(); vfs.next()) { methodHandle mh(current_thread, vfs.method()); if (mh->is_native()) return(JVMTI_ERROR_OPAQUE_FRAME); is_interpreted[frame_count] = vfs.is_interpreted_frame(); frame_sp[frame_count] = vfs.frame_id(); if (++frame_count > 1) break; } if (frame_count < 2) { // We haven't found two adjacent non-native Java frames on the top. // There can be two situations here: // 1. There are no more java frames // 2. Two top java frames are separated by non-java native frames if(vframeFor(java_thread, 1) == NULL) { return JVMTI_ERROR_NO_MORE_FRAMES; } else { // Intervening non-java native or VM frames separate java frames. // Current implementation does not support this. See bug #5031735. // In theory it is possible to pop frames in such cases. return JVMTI_ERROR_OPAQUE_FRAME; } } // If any of the top 2 frames is a compiled one, need to deoptimize it for (int i = 0; i < 2; i++) { if (!is_interpreted[i]) { Deoptimization::deoptimize_frame(java_thread, frame_sp[i]); } } // Update the thread state to reflect that the top frame is popped // so that cur_stack_depth is maintained properly and all frameIDs // are invalidated. // The current frame will be popped later when the suspended thread // is resumed and right before returning from VM to Java. // (see call_VM_base() in assembler_.cpp). // It's fine to update the thread state here because no JVMTI events // shall be posted for this PopFrame. // It is only safe to perform the direct operation on the current // thread. All other usage needs to use a vm-safepoint-op for safety. if (java_thread == JavaThread::current()) { state->update_for_pop_top_frame(); } else { VM_UpdateForPopTopFrame op(state); VMThread::execute(&op); jvmtiError err = op.result(); if (err != JVMTI_ERROR_NONE) { return err; } } java_thread->set_popframe_condition(JavaThread::popframe_pending_bit); // Set pending step flag for this popframe and it is cleared when next // step event is posted. state->set_pending_step_for_popframe(); } return JVMTI_ERROR_NONE; } /* end PopFrame */ // Threads_lock NOT held, java_thread not protected by lock // java_thread - pre-checked // java_thread - unchecked // depth - pre-checked as non-negative // method_ptr - pre-checked for NULL // location_ptr - pre-checked for NULL jvmtiError JvmtiEnv::GetFrameLocation(JavaThread* java_thread, jint depth, jmethodID* method_ptr, jlocation* location_ptr) { jvmtiError err = JVMTI_ERROR_NONE; // It is only safe to perform the direct operation on the current // thread. All other usage needs to use a vm-safepoint-op 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 at safepoint. VM_GetFrameLocation op(this, java_thread, depth, method_ptr, location_ptr); VMThread::execute(&op); err = op.result(); } return err; } /* end GetFrameLocation */ // Threads_lock NOT held, java_thread not protected by lock // java_thread - pre-checked // java_thread - unchecked // depth - pre-checked as non-negative jvmtiError JvmtiEnv::NotifyFramePop(JavaThread* java_thread, jint depth) { jvmtiError err = JVMTI_ERROR_NONE; ResourceMark rm; uint32_t debug_bits = 0; JvmtiThreadState *state = JvmtiThreadState::state_for(java_thread); if (state == NULL) { return JVMTI_ERROR_THREAD_NOT_ALIVE; } if (!java_thread->is_thread_fully_suspended(true, &debug_bits)) { return JVMTI_ERROR_THREAD_NOT_SUSPENDED; } if (TraceJVMTICalls) { JvmtiSuspendControl::print(); } vframe *vf = vframeFor(java_thread, depth); if (vf == NULL) { return JVMTI_ERROR_NO_MORE_FRAMES; } if (!vf->is_java_frame() || ((javaVFrame*) vf)->method()->is_native()) { return JVMTI_ERROR_OPAQUE_FRAME; } assert(vf->frame_pointer() != NULL, "frame pointer mustn't be NULL"); // It is only safe to perform the direct operation on the current // thread. All other usage needs to use a vm-safepoint-op for safety. if (java_thread == JavaThread::current()) { int frame_number = state->count_frames() - depth; state->env_thread_state(this)->set_frame_pop(frame_number); } else { VM_SetFramePop op(this, state, depth); VMThread::execute(&op); err = op.result(); } return err; } /* end NotifyFramePop */ // // Force Early Return functions // // Threads_lock NOT held, java_thread not protected by lock // java_thread - pre-checked jvmtiError JvmtiEnv::ForceEarlyReturnObject(JavaThread* java_thread, jobject value) { jvalue val; val.l = value; return force_early_return(java_thread, val, atos); } /* end ForceEarlyReturnObject */ // Threads_lock NOT held, java_thread not protected by lock // java_thread - pre-checked jvmtiError JvmtiEnv::ForceEarlyReturnInt(JavaThread* java_thread, jint value) { jvalue val; val.i = value; return force_early_return(java_thread, val, itos); } /* end ForceEarlyReturnInt */ // Threads_lock NOT held, java_thread not protected by lock // java_thread - pre-checked jvmtiError JvmtiEnv::ForceEarlyReturnLong(JavaThread* java_thread, jlong value) { jvalue val; val.j = value; return force_early_return(java_thread, val, ltos); } /* end ForceEarlyReturnLong */ // Threads_lock NOT held, java_thread not protected by lock // java_thread - pre-checked jvmtiError JvmtiEnv::ForceEarlyReturnFloat(JavaThread* java_thread, jfloat value) { jvalue val; val.f = value; return force_early_return(java_thread, val, ftos); } /* end ForceEarlyReturnFloat */ // Threads_lock NOT held, java_thread not protected by lock // java_thread - pre-checked jvmtiError JvmtiEnv::ForceEarlyReturnDouble(JavaThread* java_thread, jdouble value) { jvalue val; val.d = value; return force_early_return(java_thread, val, dtos); } /* end ForceEarlyReturnDouble */ // Threads_lock NOT held, java_thread not protected by lock // java_thread - pre-checked jvmtiError JvmtiEnv::ForceEarlyReturnVoid(JavaThread* java_thread) { jvalue val; val.j = 0L; return force_early_return(java_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, const void* 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; } } Thread *thread = Thread::current(); HandleMark hm(thread); TraceTime t("FollowReferences", TRACETIME_LOG(Debug, jvmti, objecttagging)); JvmtiTagMap::tag_map_for(this)->follow_references(heap_filter, k, initial_object, callbacks, user_data); return JVMTI_ERROR_NONE; } /* end FollowReferences */ // 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, const void* 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; } } TraceTime t("IterateThroughHeap", TRACETIME_LOG(Debug, jvmti, objecttagging)); JvmtiTagMap::tag_map_for(this)->iterate_through_heap(heap_filter, k, callbacks, user_data); return JVMTI_ERROR_NONE; } /* end IterateThroughHeap */ // tag_ptr - pre-checked for NULL jvmtiError JvmtiEnv::GetTag(jobject object, jlong* tag_ptr) { oop o = JNIHandles::resolve_external_guard(object); NULL_CHECK(o, JVMTI_ERROR_INVALID_OBJECT); *tag_ptr = JvmtiTagMap::tag_map_for(this)->get_tag(object); return JVMTI_ERROR_NONE; } /* end GetTag */ jvmtiError JvmtiEnv::SetTag(jobject object, jlong tag) { oop o = JNIHandles::resolve_external_guard(object); NULL_CHECK(o, JVMTI_ERROR_INVALID_OBJECT); JvmtiTagMap::tag_map_for(this)->set_tag(object, tag); return JVMTI_ERROR_NONE; } /* end SetTag */ // 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 */ jvmtiError JvmtiEnv::ForceGarbageCollection() { Universe::heap()->collect(GCCause::_jvmti_force_gc); return JVMTI_ERROR_NONE; } /* end ForceGarbageCollection */ // // Heap (1.0) functions // // 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, const void* 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, const void* 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, const void* 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, const void* 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 // // Threads_lock NOT held, java_thread not protected by lock // java_thread - pre-checked // java_thread - unchecked // depth - pre-checked as non-negative // value_ptr - pre-checked for NULL jvmtiError JvmtiEnv::GetLocalObject(JavaThread* java_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); VM_GetOrSetLocal op(java_thread, current_thread, depth, slot); VMThread::execute(&op); jvmtiError err = op.result(); if (err != JVMTI_ERROR_NONE) { return err; } else { *value_ptr = op.value().l; return JVMTI_ERROR_NONE; } } /* end GetLocalObject */ // Threads_lock NOT held, java_thread not protected by lock // java_thread - pre-checked // java_thread - unchecked // depth - pre-checked as non-negative // value - pre-checked for NULL jvmtiError JvmtiEnv::GetLocalInstance(JavaThread* java_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); VM_GetReceiver op(java_thread, current_thread, depth); VMThread::execute(&op); jvmtiError err = op.result(); if (err != JVMTI_ERROR_NONE) { return err; } else { *value_ptr = op.value().l; return JVMTI_ERROR_NONE; } } /* end GetLocalInstance */ // Threads_lock NOT held, java_thread not protected by lock // java_thread - pre-checked // java_thread - unchecked // depth - pre-checked as non-negative // value_ptr - pre-checked for NULL jvmtiError JvmtiEnv::GetLocalInt(JavaThread* java_thread, jint depth, jint slot, jint* value_ptr) { // rm object is created to clean up the javaVFrame created in // doit_prologue(), but after doit() is finished with it. ResourceMark rm; VM_GetOrSetLocal op(java_thread, depth, slot, T_INT); VMThread::execute(&op); *value_ptr = op.value().i; return op.result(); } /* end GetLocalInt */ // Threads_lock NOT held, java_thread not protected by lock // java_thread - pre-checked // java_thread - unchecked // depth - pre-checked as non-negative // value_ptr - pre-checked for NULL jvmtiError JvmtiEnv::GetLocalLong(JavaThread* java_thread, jint depth, jint slot, jlong* value_ptr) { // rm object is created to clean up the javaVFrame created in // doit_prologue(), but after doit() is finished with it. ResourceMark rm; VM_GetOrSetLocal op(java_thread, depth, slot, T_LONG); VMThread::execute(&op); *value_ptr = op.value().j; return op.result(); } /* end GetLocalLong */ // Threads_lock NOT held, java_thread not protected by lock // java_thread - pre-checked // java_thread - unchecked // depth - pre-checked as non-negative // value_ptr - pre-checked for NULL jvmtiError JvmtiEnv::GetLocalFloat(JavaThread* java_thread, jint depth, jint slot, jfloat* value_ptr) { // rm object is created to clean up the javaVFrame created in // doit_prologue(), but after doit() is finished with it. ResourceMark rm; VM_GetOrSetLocal op(java_thread, depth, slot, T_FLOAT); VMThread::execute(&op); *value_ptr = op.value().f; return op.result(); } /* end GetLocalFloat */ // Threads_lock NOT held, java_thread not protected by lock // java_thread - pre-checked // java_thread - unchecked // depth - pre-checked as non-negative // value_ptr - pre-checked for NULL jvmtiError JvmtiEnv::GetLocalDouble(JavaThread* java_thread, jint depth, jint slot, jdouble* value_ptr) { // rm object is created to clean up the javaVFrame created in // doit_prologue(), but after doit() is finished with it. ResourceMark rm; VM_GetOrSetLocal op(java_thread, depth, slot, T_DOUBLE); VMThread::execute(&op); *value_ptr = op.value().d; return op.result(); } /* end GetLocalDouble */ // Threads_lock NOT held, java_thread not protected by lock // java_thread - pre-checked // java_thread - unchecked // depth - pre-checked as non-negative jvmtiError JvmtiEnv::SetLocalObject(JavaThread* java_thread, jint depth, jint slot, jobject value) { // rm object is created to clean up the javaVFrame created in // doit_prologue(), but after doit() is finished with it. ResourceMark rm; jvalue val; val.l = value; VM_GetOrSetLocal op(java_thread, depth, slot, T_OBJECT, val); VMThread::execute(&op); return op.result(); } /* end SetLocalObject */ // Threads_lock NOT held, java_thread not protected by lock // java_thread - pre-checked // java_thread - unchecked // depth - pre-checked as non-negative jvmtiError JvmtiEnv::SetLocalInt(JavaThread* java_thread, jint depth, jint slot, jint value) { // rm object is created to clean up the javaVFrame created in // doit_prologue(), but after doit() is finished with it. ResourceMark rm; jvalue val; val.i = value; VM_GetOrSetLocal op(java_thread, depth, slot, T_INT, val); VMThread::execute(&op); return op.result(); } /* end SetLocalInt */ // Threads_lock NOT held, java_thread not protected by lock // java_thread - pre-checked // java_thread - unchecked // depth - pre-checked as non-negative jvmtiError JvmtiEnv::SetLocalLong(JavaThread* java_thread, jint depth, jint slot, jlong value) { // rm object is created to clean up the javaVFrame created in // doit_prologue(), but after doit() is finished with it. ResourceMark rm; jvalue val; val.j = value; VM_GetOrSetLocal op(java_thread, depth, slot, T_LONG, val); VMThread::execute(&op); return op.result(); } /* end SetLocalLong */ // Threads_lock NOT held, java_thread not protected by lock // java_thread - pre-checked // java_thread - unchecked // depth - pre-checked as non-negative jvmtiError JvmtiEnv::SetLocalFloat(JavaThread* java_thread, jint depth, jint slot, jfloat value) { // rm object is created to clean up the javaVFrame created in // doit_prologue(), but after doit() is finished with it. ResourceMark rm; jvalue val; val.f = value; VM_GetOrSetLocal op(java_thread, depth, slot, T_FLOAT, val); VMThread::execute(&op); return op.result(); } /* end SetLocalFloat */ // Threads_lock NOT held, java_thread not protected by lock // java_thread - pre-checked // java_thread - unchecked // depth - pre-checked as non-negative jvmtiError JvmtiEnv::SetLocalDouble(JavaThread* java_thread, jint depth, jint slot, jdouble value) { // rm object is created to clean up the javaVFrame created in // doit_prologue(), but after doit() is finished with it. ResourceMark rm; jvalue val; val.d = value; VM_GetOrSetLocal op(java_thread, depth, slot, T_DOUBLE, val); VMThread::execute(&op); return op.result(); } /* end SetLocalDouble */ // // Breakpoint functions // // method_oop - pre-checked for validity, but may be NULL meaning obsolete method jvmtiError JvmtiEnv::SetBreakpoint(Method* method_oop, jlocation location) { NULL_CHECK(method_oop, 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_oop->code_size()) { return JVMTI_ERROR_INVALID_LOCATION; } ResourceMark rm; JvmtiBreakpoint bp(method_oop, location); JvmtiBreakpoints& jvmti_breakpoints = JvmtiCurrentBreakpoints::get_jvmti_breakpoints(); if (jvmti_breakpoints.set(bp) == JVMTI_ERROR_DUPLICATE) return JVMTI_ERROR_DUPLICATE; if (TraceJVMTICalls) { jvmti_breakpoints.print(); } return JVMTI_ERROR_NONE; } /* end SetBreakpoint */ // method_oop - pre-checked for validity, but may be NULL meaning obsolete method jvmtiError JvmtiEnv::ClearBreakpoint(Method* method_oop, jlocation location) { NULL_CHECK(method_oop, 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_oop->code_size()) { return JVMTI_ERROR_INVALID_LOCATION; } JvmtiBreakpoint bp(method_oop, 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); JvmtiEventController::change_field_watch(JVMTI_EVENT_FIELD_ACCESS, 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); JvmtiEventController::change_field_watch(JVMTI_EVENT_FIELD_ACCESS, 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); JvmtiEventController::change_field_watch(JVMTI_EVENT_FIELD_MODIFICATION, 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); JvmtiEventController::change_field_watch(JVMTI_EVENT_FIELD_MODIFICATION, 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 { const char* 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) { const char *gen_sig = soo->as_C_string(); if (gen_sig != NULL) { char* gen_result; jvmtiError err = allocate(strlen(gen_sig) + 1, (unsigned char **)&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; } Symbol* sfnOop = InstanceKlass::cast(k_klass)->source_file_name(); NULL_CHECK(sfnOop, JVMTI_ERROR_ABSENT_INFORMATION); { JavaThread* current_thread = JavaThread::current(); ResourceMark rm(current_thread); const char* sfncp = (const char*) sfnOop->as_C_string(); *source_name_ptr = (char *) jvmtiMalloc(strlen(sfncp)+1); strcpy(*source_name_ptr, sfncp); } 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(current_thread); JavaThread* THREAD = current_thread; // pass to macros if (HAS_PENDING_EXCEPTION) { CLEAR_PENDING_EXCEPTION; return JVMTI_ERROR_INTERNAL; }; // 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); if (java_lang_Class::is_primitive(k_mirror)) { *method_count_ptr = 0; *methods_ptr = (jmethodID*) jvmtiMalloc(0 * sizeof(jmethodID)); return JVMTI_ERROR_NONE; } 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; } 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; if (JvmtiExport::can_maintain_original_method_order()) { // Use the original method ordering indices stored in the class, so we can emit // jmethodIDs in the order they appeared in the class file for (index = 0; index < result_length; index++) { Method* m = ik->methods()->at(index); int original_index = ik->method_ordering()->at(index); assert(original_index >= 0 && original_index < result_length, "invalid original method index"); 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[original_index] = id; } } else { // otherwise just copy in any order for (index = 0; index < result_length; index++) { Method* m = ik->methods()->at(index); 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[index] = id; } } // Fill in return value. *method_count_ptr = result_length; *methods_ptr = result_list; return JVMTI_ERROR_NONE; } /* end GetClassMethods */ // k_mirror - may be primitive, this must be checked // field_count_ptr - pre-checked for NULL // fields_ptr - pre-checked for NULL jvmtiError JvmtiEnv::GetClassFields(oop k_mirror, jint* field_count_ptr, jfieldID** fields_ptr) { if (java_lang_Class::is_primitive(k_mirror)) { *field_count_ptr = 0; *fields_ptr = (jfieldID*) jvmtiMalloc(0 * sizeof(jfieldID)); 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; } if (!k->is_instance_klass()) { *field_count_ptr = 0; *fields_ptr = (jfieldID*) jvmtiMalloc(0 * sizeof(jfieldID)); return JVMTI_ERROR_NONE; } InstanceKlass* ik = InstanceKlass::cast(k); 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; if (!k->is_instance_klass()) { *interface_count_ptr = 0; *interfaces_ptr = (jclass*) jvmtiMalloc(0 * sizeof(jclass)); return JVMTI_ERROR_NONE; } Array* interface_list = InstanceKlass::cast(k)->local_interfaces(); const int result_length = (interface_list == NULL ? 0 : interface_list->length()); jclass* result_list = (jclass*) jvmtiMalloc(result_length * sizeof(jclass)); for (int i_index = 0; i_index < result_length; i_index += 1) { InstanceKlass* klass_at = interface_list->at(i_index); assert(klass_at->is_klass(), "interfaces must be Klass*s"); assert(klass_at->is_interface(), "interfaces must be interfaces"); oop mirror_at = klass_at->java_mirror(); Handle handle_at = Handle(current_thread, mirror_at); result_list[i_index] = (jclass) jni_reference(handle_at); } *interface_count_ptr = result_length; *interfaces_ptr = result_list; } 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, unsigned char** 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(); } unsigned char *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(); } constantPoolHandle constants(thread, ik->constants()); *constant_pool_count_ptr = constants->length(); *constant_pool_byte_count_ptr = cpool_size; *constant_pool_bytes_ptr = cpool_bytes; 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); oop result_oop = k->class_loader(); if (result_oop == NULL) { *classloader_ptr = (jclass) jni_reference(Handle()); return JVMTI_ERROR_NONE; } Handle result_handle = Handle(current_thread, result_oop); jclass result_jnihandle = (jclass) jni_reference(result_handle); *classloader_ptr = result_jnihandle; } return JVMTI_ERROR_NONE; } /* end GetClassLoader */ // k_mirror - may be primitive, this must be checked // source_debug_extension_ptr - pre-checked for NULL jvmtiError JvmtiEnv::GetSourceDebugExtension(oop k_mirror, char** source_debug_extension_ptr) { { if (java_lang_Class::is_primitive(k_mirror)) { return JVMTI_ERROR_ABSENT_INFORMATION; } Klass* k = java_lang_Class::as_Klass(k_mirror); NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS); if (!k->is_instance_klass()) { return JVMTI_ERROR_ABSENT_INFORMATION; } const char* sde = InstanceKlass::cast(k)->source_debug_extension(); NULL_CHECK(sde, JVMTI_ERROR_ABSENT_INFORMATION); { *source_debug_extension_ptr = (char *) jvmtiMalloc(strlen(sde)+1); strcpy(*source_debug_extension_ptr, sde); } } return JVMTI_ERROR_NONE; } /* end GetSourceDebugExtension */ // // Object functions // // hash_code_ptr - pre-checked for NULL jvmtiError JvmtiEnv::GetObjectHashCode(jobject object, jint* hash_code_ptr) { oop mirror = JNIHandles::resolve_external_guard(object); NULL_CHECK(mirror, JVMTI_ERROR_INVALID_OBJECT); NULL_CHECK(hash_code_ptr, JVMTI_ERROR_NULL_POINTER); { 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 { const char* 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 { const char* 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) { const char* gen_sig = soop->as_C_string(); if (gen_sig != NULL) { jvmtiError err = allocate(strlen(gen_sig) + 1, (unsigned char **)generic_ptr); if (err != JVMTI_ERROR_NONE) { return err; } strcpy(*generic_ptr, gen_sig); } } } return JVMTI_ERROR_NONE; } /* end GetFieldName */ // declaring_class_ptr - pre-checked for NULL jvmtiError JvmtiEnv::GetFieldDeclaringClass(fieldDescriptor* fdesc_ptr, jclass* declaring_class_ptr) { *declaring_class_ptr = get_jni_class_non_null(fdesc_ptr->field_holder()); return JVMTI_ERROR_NONE; } /* end GetFieldDeclaringClass */ // modifiers_ptr - pre-checked for NULL jvmtiError JvmtiEnv::GetFieldModifiers(fieldDescriptor* fdesc_ptr, jint* modifiers_ptr) { AccessFlags resultFlags = fdesc_ptr->access_flags(); jint result = resultFlags.as_int(); *modifiers_ptr = result; return JVMTI_ERROR_NONE; } /* end GetFieldModifiers */ // is_synthetic_ptr - pre-checked for NULL jvmtiError JvmtiEnv::IsFieldSynthetic(fieldDescriptor* fdesc_ptr, jboolean* is_synthetic_ptr) { *is_synthetic_ptr = fdesc_ptr->is_synthetic(); return JVMTI_ERROR_NONE; } /* end IsFieldSynthetic */ // // Method functions // // method_oop - 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_oop, char** name_ptr, char** signature_ptr, char** generic_ptr) { NULL_CHECK(method_oop, 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 { const char* utf8_name = (const char *) method_oop->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 { const char* utf8_signature = (const char *) method_oop->signature()->as_utf8(); *signature_ptr = (char *) jvmtiMalloc(strlen(utf8_signature) + 1); strcpy(*signature_ptr, utf8_signature); } if (generic_ptr != NULL) { *generic_ptr = NULL; Symbol* soop = method_oop->generic_signature(); if (soop != NULL) { const char* gen_sig = soop->as_C_string(); if (gen_sig != NULL) { jvmtiError err = allocate(strlen(gen_sig) + 1, (unsigned char **)generic_ptr); if (err != JVMTI_ERROR_NONE) { return err; } strcpy(*generic_ptr, gen_sig); } } } return JVMTI_ERROR_NONE; } /* end GetMethodName */ // method_oop - pre-checked for validity, but may be NULL meaning obsolete method // declaring_class_ptr - pre-checked for NULL jvmtiError JvmtiEnv::GetMethodDeclaringClass(Method* method_oop, jclass* declaring_class_ptr) { NULL_CHECK(method_oop, JVMTI_ERROR_INVALID_METHODID); (*declaring_class_ptr) = get_jni_class_non_null(method_oop->method_holder()); return JVMTI_ERROR_NONE; } /* end GetMethodDeclaringClass */ // method_oop - pre-checked for validity, but may be NULL meaning obsolete method // modifiers_ptr - pre-checked for NULL jvmtiError JvmtiEnv::GetMethodModifiers(Method* method_oop, jint* modifiers_ptr) { NULL_CHECK(method_oop, JVMTI_ERROR_INVALID_METHODID); (*modifiers_ptr) = method_oop->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS; return JVMTI_ERROR_NONE; } /* end GetMethodModifiers */ // method_oop - pre-checked for validity, but may be NULL meaning obsolete method // max_ptr - pre-checked for NULL jvmtiError JvmtiEnv::GetMaxLocals(Method* method_oop, jint* max_ptr) { NULL_CHECK(method_oop, JVMTI_ERROR_INVALID_METHODID); // get max stack (*max_ptr) = method_oop->max_locals(); return JVMTI_ERROR_NONE; } /* end GetMaxLocals */ // method_oop - pre-checked for validity, but may be NULL meaning obsolete method // size_ptr - pre-checked for NULL jvmtiError JvmtiEnv::GetArgumentsSize(Method* method_oop, jint* size_ptr) { NULL_CHECK(method_oop, JVMTI_ERROR_INVALID_METHODID); // get size of arguments (*size_ptr) = method_oop->size_of_parameters(); return JVMTI_ERROR_NONE; } /* end GetArgumentsSize */ // method_oop - 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_oop, jint* entry_count_ptr, jvmtiLineNumberEntry** table_ptr) { NULL_CHECK(method_oop, JVMTI_ERROR_INVALID_METHODID); if (!method_oop->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. // Compute size of table jint num_entries = 0; CompressedLineNumberReadStream stream(method_oop->compressed_linenumber_table()); while (stream.read_pair()) { num_entries++; } jvmtiLineNumberEntry *jvmti_table = (jvmtiLineNumberEntry *)jvmtiMalloc(num_entries * (sizeof(jvmtiLineNumberEntry))); // Fill jvmti table if (num_entries > 0) { int index = 0; CompressedLineNumberReadStream stream(method_oop->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_oop - 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_oop, jlocation* start_location_ptr, jlocation* end_location_ptr) { NULL_CHECK(method_oop, JVMTI_ERROR_INVALID_METHODID); // get start and end location (*end_location_ptr) = (jlocation) (method_oop->code_size() - 1); if (method_oop->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_oop - 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_oop, jint* entry_count_ptr, jvmtiLocalVariableEntry** table_ptr) { NULL_CHECK(method_oop, JVMTI_ERROR_INVALID_METHODID); JavaThread* current_thread = JavaThread::current(); // does the klass have any local variable information? InstanceKlass* ik = method_oop->method_holder(); if (!ik->access_flags().has_localvariable_table()) { return (JVMTI_ERROR_ABSENT_INFORMATION); } ConstantPool* constants = method_oop->constants(); NULL_CHECK(constants, 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_oop->localvariable_table_length(); jvmtiLocalVariableEntry *jvmti_table = (jvmtiLocalVariableEntry *) jvmtiMalloc(num_entries * (sizeof(jvmtiLocalVariableEntry))); if (num_entries > 0) { LocalVariableTableElement* table = method_oop->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); const char *utf8_name = (const char *) constants->symbol_at(name_index)->as_utf8(); name_buf = (char *) jvmtiMalloc(strlen(utf8_name)+1); strcpy(name_buf, utf8_name); const char *utf8_signature = (const char *) constants->symbol_at(signature_index)->as_utf8(); sig_buf = (char *) jvmtiMalloc(strlen(utf8_signature)+1); strcpy(sig_buf, utf8_signature); if (generic_signature_index > 0) { const char *utf8_gen_sign = (const char *) constants->symbol_at(generic_signature_index)->as_utf8(); gen_sig_buf = (char *) jvmtiMalloc(strlen(utf8_gen_sign)+1); strcpy(gen_sig_buf, utf8_gen_sign); } } // 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_oop - 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_oop, jint* bytecode_count_ptr, unsigned char** bytecodes_ptr) { NULL_CHECK(method_oop, JVMTI_ERROR_INVALID_METHODID); HandleMark hm; methodHandle method(Thread::current(), method_oop); jint size = (jint)method->code_size(); jvmtiError err = allocate(size, bytecodes_ptr); if (err != JVMTI_ERROR_NONE) { return err; } (*bytecode_count_ptr) = size; // get byte codes JvmtiClassFileReconstituter::copy_bytecodes(method, *bytecodes_ptr); return JVMTI_ERROR_NONE; } /* end GetBytecodes */ // method_oop - pre-checked for validity, but may be NULL meaning obsolete method // is_native_ptr - pre-checked for NULL jvmtiError JvmtiEnv::IsMethodNative(Method* method_oop, jboolean* is_native_ptr) { NULL_CHECK(method_oop, JVMTI_ERROR_INVALID_METHODID); (*is_native_ptr) = method_oop->is_native(); return JVMTI_ERROR_NONE; } /* end IsMethodNative */ // method_oop - pre-checked for validity, but may be NULL meaning obsolete method // is_synthetic_ptr - pre-checked for NULL jvmtiError JvmtiEnv::IsMethodSynthetic(Method* method_oop, jboolean* is_synthetic_ptr) { NULL_CHECK(method_oop, JVMTI_ERROR_INVALID_METHODID); (*is_synthetic_ptr) = method_oop->is_synthetic(); return JVMTI_ERROR_NONE; } /* end IsMethodSynthetic */ // method_oop - pre-checked for validity, but may be NULL meaning obsolete method // is_obsolete_ptr - pre-checked for NULL jvmtiError JvmtiEnv::IsMethodObsolete(Method* method_oop, 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; } if (method_oop == NULL || method_oop->is_obsolete()) { *is_obsolete_ptr = true; } else { *is_obsolete_ptr = false; } return JVMTI_ERROR_NONE; } /* end IsMethodObsolete */ // // Raw Monitor functions // // name - pre-checked for NULL // monitor_ptr - pre-checked for NULL jvmtiError JvmtiEnv::CreateRawMonitor(const char* 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(); if (thread->is_Java_thread()) { JavaThread* current_thread = (JavaThread*)thread; /* Transition to thread_blocked without entering vm state */ /* This is really evil. Normally you can't undo _thread_blocked */ /* transitions like this because it would cause us to miss a */ /* safepoint but since the thread was already in _thread_in_native */ /* the thread is not leaving a safepoint safe state and it will */ /* block when it tries to return from native. We can't safepoint */ /* block in here because we could deadlock the vmthread. Blech. */ JavaThreadState state = current_thread->thread_state(); assert(state == _thread_in_native, "Must be _thread_in_native"); // frame should already be walkable since we are in native assert(!current_thread->has_last_Java_frame() || current_thread->frame_anchor()->walkable(), "Must be walkable"); current_thread->set_thread_state(_thread_blocked); rmonitor->raw_enter(current_thread); // restore state, still at a safepoint safe state current_thread->set_thread_state(state); } else { rmonitor->raw_enter(thread); } } return JVMTI_ERROR_NONE; } /* end RawMonitorEnter */ // rmonitor - pre-checked for validity jvmtiError JvmtiEnv::RawMonitorExit(JvmtiRawMonitor * rmonitor) { jvmtiError err = JVMTI_ERROR_NONE; 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 */ // rmonitor - pre-checked for validity jvmtiError JvmtiEnv::RawMonitorWait(JvmtiRawMonitor * rmonitor, jlong millis) { Thread* thread = Thread::current(); int r = rmonitor->raw_wait(millis, thread); 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 */ // nanos_ptr - pre-checked for NULL jvmtiError JvmtiEnv::GetCurrentThreadCpuTime(jlong* nanos_ptr) { *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 */ // Threads_lock NOT held, java_thread not protected by lock // java_thread - pre-checked // nanos_ptr - pre-checked for NULL jvmtiError JvmtiEnv::GetThreadCpuTime(JavaThread* java_thread, jlong* nanos_ptr) { *nanos_ptr = os::thread_cpu_time(java_thread); return JVMTI_ERROR_NONE; } /* end GetThreadCpuTime */ // info_ptr - pre-checked for NULL jvmtiError JvmtiEnv::GetTimerInfo(jvmtiTimerInfo* info_ptr) { os::javaTimeNanos_info(info_ptr); return JVMTI_ERROR_NONE; } /* end GetTimerInfo */ // nanos_ptr - pre-checked for NULL jvmtiError JvmtiEnv::GetTime(jlong* nanos_ptr) { *nanos_ptr = os::javaTimeNanos(); return JVMTI_ERROR_NONE; } /* end GetTime */ // processor_count_ptr - pre-checked for NULL jvmtiError JvmtiEnv::GetAvailableProcessors(jint* processor_count_ptr) { *processor_count_ptr = os::active_processor_count(); return JVMTI_ERROR_NONE; } /* end GetAvailableProcessors */ jvmtiError JvmtiEnv::SetHeapSamplingInterval(jint sampling_interval) { if (sampling_interval < 0) { return JVMTI_ERROR_ILLEGAL_ARGUMENT; } ThreadHeapSampler::set_sampling_interval(sampling_interval); return JVMTI_ERROR_NONE; } /* end SetHeapSamplingInterval */ // // System Properties functions // // count_ptr - pre-checked for NULL // property_ptr - pre-checked for NULL jvmtiError JvmtiEnv::GetSystemProperties(jint* count_ptr, char*** property_ptr) { jvmtiError err = JVMTI_ERROR_NONE; // Get the number of readable properties. *count_ptr = Arguments::PropertyList_readable_count(Arguments::system_properties()); // Allocate memory to hold the exact number of readable properties. err = allocate(*count_ptr * sizeof(char *), (unsigned char **)property_ptr); if (err != JVMTI_ERROR_NONE) { return err; } int readable_count = 0; // Loop through the system properties until all the readable properties are found. for (SystemProperty* p = Arguments::system_properties(); p != NULL && readable_count < *count_ptr; p = p->next()) { if (p->is_readable()) { const char *key = p->key(); char **tmp_value = *property_ptr+readable_count; readable_count++; err = allocate((strlen(key)+1) * sizeof(char), (unsigned char**)tmp_value); if (err == JVMTI_ERROR_NONE) { strcpy(*tmp_value, key); } else { // clean up previously allocated memory. for (int j = 0; j < readable_count; j++) { Deallocate((unsigned char*)*property_ptr+j); } Deallocate((unsigned char*)property_ptr); break; } } } assert(err != JVMTI_ERROR_NONE || readable_count == *count_ptr, "Bad readable property count"); return err; } /* end GetSystemProperties */ // property - pre-checked for NULL // value_ptr - pre-checked for NULL jvmtiError JvmtiEnv::GetSystemProperty(const char* property, char** value_ptr) { jvmtiError err = JVMTI_ERROR_NONE; const char *value; // 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), (unsigned char **)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(const char* property, const char* value_ptr) { jvmtiError err =JVMTI_ERROR_NOT_AVAILABLE; for (SystemProperty* p = Arguments::system_properties(); p != NULL; p = p->next()) { if (strcmp(property, p->key()) == 0) { if (p->set_writeable_value(value_ptr)) { err = JVMTI_ERROR_NONE; } } } return err; } /* end SetSystemProperty */