/* * Copyright (c) 2003, 2019, 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 "interpreter/interpreter.hpp" #include "jvmtifiles/jvmtiEnv.hpp" #include "logging/log.hpp" #include "memory/resourceArea.hpp" #include "prims/jvmtiEventController.hpp" #include "prims/jvmtiEventController.inline.hpp" #include "prims/jvmtiExport.hpp" #include "prims/jvmtiImpl.hpp" #include "prims/jvmtiThreadState.inline.hpp" #include "runtime/frame.hpp" #include "runtime/thread.inline.hpp" #include "runtime/threadSMR.hpp" #include "runtime/vframe.hpp" #include "runtime/vframe_hp.hpp" #include "runtime/vmThread.hpp" #include "runtime/vmOperations.hpp" #ifdef JVMTI_TRACE #define EC_TRACE(out) do { \ if (JvmtiTrace::trace_event_controller()) { \ SafeResourceMark rm; \ log_trace(jvmti) out; \ } \ } while (0) #else #define EC_TRACE(out) #endif /*JVMTI_TRACE */ // bits for standard events static const jlong SINGLE_STEP_BIT = (((jlong)1) << (JVMTI_EVENT_SINGLE_STEP - TOTAL_MIN_EVENT_TYPE_VAL)); static const jlong FRAME_POP_BIT = (((jlong)1) << (JVMTI_EVENT_FRAME_POP - TOTAL_MIN_EVENT_TYPE_VAL)); static const jlong BREAKPOINT_BIT = (((jlong)1) << (JVMTI_EVENT_BREAKPOINT - TOTAL_MIN_EVENT_TYPE_VAL)); static const jlong FIELD_ACCESS_BIT = (((jlong)1) << (JVMTI_EVENT_FIELD_ACCESS - TOTAL_MIN_EVENT_TYPE_VAL)); static const jlong FIELD_MODIFICATION_BIT = (((jlong)1) << (JVMTI_EVENT_FIELD_MODIFICATION - TOTAL_MIN_EVENT_TYPE_VAL)); static const jlong METHOD_ENTRY_BIT = (((jlong)1) << (JVMTI_EVENT_METHOD_ENTRY - TOTAL_MIN_EVENT_TYPE_VAL)); static const jlong METHOD_EXIT_BIT = (((jlong)1) << (JVMTI_EVENT_METHOD_EXIT - TOTAL_MIN_EVENT_TYPE_VAL)); static const jlong CLASS_FILE_LOAD_HOOK_BIT = (((jlong)1) << (JVMTI_EVENT_CLASS_FILE_LOAD_HOOK - TOTAL_MIN_EVENT_TYPE_VAL)); static const jlong NATIVE_METHOD_BIND_BIT = (((jlong)1) << (JVMTI_EVENT_NATIVE_METHOD_BIND - TOTAL_MIN_EVENT_TYPE_VAL)); static const jlong VM_START_BIT = (((jlong)1) << (JVMTI_EVENT_VM_START - TOTAL_MIN_EVENT_TYPE_VAL)); static const jlong VM_INIT_BIT = (((jlong)1) << (JVMTI_EVENT_VM_INIT - TOTAL_MIN_EVENT_TYPE_VAL)); static const jlong VM_DEATH_BIT = (((jlong)1) << (JVMTI_EVENT_VM_DEATH - TOTAL_MIN_EVENT_TYPE_VAL)); static const jlong CLASS_LOAD_BIT = (((jlong)1) << (JVMTI_EVENT_CLASS_LOAD - TOTAL_MIN_EVENT_TYPE_VAL)); static const jlong CLASS_PREPARE_BIT = (((jlong)1) << (JVMTI_EVENT_CLASS_PREPARE - TOTAL_MIN_EVENT_TYPE_VAL)); static const jlong THREAD_START_BIT = (((jlong)1) << (JVMTI_EVENT_THREAD_START - TOTAL_MIN_EVENT_TYPE_VAL)); static const jlong THREAD_END_BIT = (((jlong)1) << (JVMTI_EVENT_THREAD_END - TOTAL_MIN_EVENT_TYPE_VAL)); static const jlong EXCEPTION_THROW_BIT = (((jlong)1) << (JVMTI_EVENT_EXCEPTION - TOTAL_MIN_EVENT_TYPE_VAL)); static const jlong EXCEPTION_CATCH_BIT = (((jlong)1) << (JVMTI_EVENT_EXCEPTION_CATCH - TOTAL_MIN_EVENT_TYPE_VAL)); static const jlong MONITOR_CONTENDED_ENTER_BIT = (((jlong)1) << (JVMTI_EVENT_MONITOR_CONTENDED_ENTER - TOTAL_MIN_EVENT_TYPE_VAL)); static const jlong MONITOR_CONTENDED_ENTERED_BIT = (((jlong)1) << (JVMTI_EVENT_MONITOR_CONTENDED_ENTERED - TOTAL_MIN_EVENT_TYPE_VAL)); static const jlong MONITOR_WAIT_BIT = (((jlong)1) << (JVMTI_EVENT_MONITOR_WAIT - TOTAL_MIN_EVENT_TYPE_VAL)); static const jlong MONITOR_WAITED_BIT = (((jlong)1) << (JVMTI_EVENT_MONITOR_WAITED - TOTAL_MIN_EVENT_TYPE_VAL)); static const jlong DYNAMIC_CODE_GENERATED_BIT = (((jlong)1) << (JVMTI_EVENT_DYNAMIC_CODE_GENERATED - TOTAL_MIN_EVENT_TYPE_VAL)); static const jlong DATA_DUMP_BIT = (((jlong)1) << (JVMTI_EVENT_DATA_DUMP_REQUEST - TOTAL_MIN_EVENT_TYPE_VAL)); static const jlong COMPILED_METHOD_LOAD_BIT = (((jlong)1) << (JVMTI_EVENT_COMPILED_METHOD_LOAD - TOTAL_MIN_EVENT_TYPE_VAL)); static const jlong COMPILED_METHOD_UNLOAD_BIT = (((jlong)1) << (JVMTI_EVENT_COMPILED_METHOD_UNLOAD - TOTAL_MIN_EVENT_TYPE_VAL)); static const jlong GARBAGE_COLLECTION_START_BIT = (((jlong)1) << (JVMTI_EVENT_GARBAGE_COLLECTION_START - TOTAL_MIN_EVENT_TYPE_VAL)); static const jlong GARBAGE_COLLECTION_FINISH_BIT = (((jlong)1) << (JVMTI_EVENT_GARBAGE_COLLECTION_FINISH - TOTAL_MIN_EVENT_TYPE_VAL)); static const jlong OBJECT_FREE_BIT = (((jlong)1) << (JVMTI_EVENT_OBJECT_FREE - TOTAL_MIN_EVENT_TYPE_VAL)); static const jlong RESOURCE_EXHAUSTED_BIT = (((jlong)1) << (JVMTI_EVENT_RESOURCE_EXHAUSTED - TOTAL_MIN_EVENT_TYPE_VAL)); static const jlong VM_OBJECT_ALLOC_BIT = (((jlong)1) << (JVMTI_EVENT_VM_OBJECT_ALLOC - TOTAL_MIN_EVENT_TYPE_VAL)); static const jlong SAMPLED_OBJECT_ALLOC_BIT = (((jlong)1) << (JVMTI_EVENT_SAMPLED_OBJECT_ALLOC - TOTAL_MIN_EVENT_TYPE_VAL)); // bits for extension events static const jlong CLASS_UNLOAD_BIT = (((jlong)1) << (EXT_EVENT_CLASS_UNLOAD - TOTAL_MIN_EVENT_TYPE_VAL)); static const jlong MONITOR_BITS = MONITOR_CONTENDED_ENTER_BIT | MONITOR_CONTENDED_ENTERED_BIT | MONITOR_WAIT_BIT | MONITOR_WAITED_BIT; static const jlong EXCEPTION_BITS = EXCEPTION_THROW_BIT | EXCEPTION_CATCH_BIT; static const jlong INTERP_EVENT_BITS = SINGLE_STEP_BIT | METHOD_ENTRY_BIT | METHOD_EXIT_BIT | FRAME_POP_BIT | FIELD_ACCESS_BIT | FIELD_MODIFICATION_BIT; static const jlong THREAD_FILTERED_EVENT_BITS = INTERP_EVENT_BITS | EXCEPTION_BITS | MONITOR_BITS | BREAKPOINT_BIT | CLASS_LOAD_BIT | CLASS_PREPARE_BIT | THREAD_END_BIT | SAMPLED_OBJECT_ALLOC_BIT; static const jlong NEED_THREAD_LIFE_EVENTS = THREAD_FILTERED_EVENT_BITS | THREAD_START_BIT; static const jlong EARLY_EVENT_BITS = CLASS_FILE_LOAD_HOOK_BIT | CLASS_LOAD_BIT | CLASS_PREPARE_BIT | VM_START_BIT | VM_INIT_BIT | VM_DEATH_BIT | NATIVE_METHOD_BIND_BIT | THREAD_START_BIT | THREAD_END_BIT | COMPILED_METHOD_LOAD_BIT | COMPILED_METHOD_UNLOAD_BIT | DYNAMIC_CODE_GENERATED_BIT; static const jlong GLOBAL_EVENT_BITS = ~THREAD_FILTERED_EVENT_BITS; static const jlong SHOULD_POST_ON_EXCEPTIONS_BITS = EXCEPTION_BITS | METHOD_EXIT_BIT | FRAME_POP_BIT; /////////////////////////////////////////////////////////////// // // JvmtiEventEnabled // JvmtiEventEnabled::JvmtiEventEnabled() { clear(); } void JvmtiEventEnabled::clear() { _enabled_bits = 0; #ifndef PRODUCT _init_guard = JEE_INIT_GUARD; #endif } void JvmtiEventEnabled::set_enabled(jvmtiEvent event_type, bool enabled) { jlong bits = get_bits(); jlong mask = bit_for(event_type); if (enabled) { bits |= mask; } else { bits &= ~mask; } set_bits(bits); } /////////////////////////////////////////////////////////////// // // JvmtiEnvThreadEventEnable // JvmtiEnvThreadEventEnable::JvmtiEnvThreadEventEnable() { _event_user_enabled.clear(); _event_enabled.clear(); } JvmtiEnvThreadEventEnable::~JvmtiEnvThreadEventEnable() { _event_user_enabled.clear(); _event_enabled.clear(); } /////////////////////////////////////////////////////////////// // // JvmtiThreadEventEnable // JvmtiThreadEventEnable::JvmtiThreadEventEnable() { _event_enabled.clear(); } JvmtiThreadEventEnable::~JvmtiThreadEventEnable() { _event_enabled.clear(); } /////////////////////////////////////////////////////////////// // // JvmtiEnvEventEnable // JvmtiEnvEventEnable::JvmtiEnvEventEnable() { _event_user_enabled.clear(); _event_callback_enabled.clear(); _event_enabled.clear(); } JvmtiEnvEventEnable::~JvmtiEnvEventEnable() { _event_user_enabled.clear(); _event_callback_enabled.clear(); _event_enabled.clear(); } /////////////////////////////////////////////////////////////// // // VM_EnterInterpOnlyMode // class VM_EnterInterpOnlyMode : public VM_Operation { private: JvmtiThreadState *_state; public: VM_EnterInterpOnlyMode(JvmtiThreadState *state); bool allow_nested_vm_operations() const { return true; } VMOp_Type type() const { return VMOp_EnterInterpOnlyMode; } void doit(); // to do: this same function is in jvmtiImpl - should be in one place bool can_be_deoptimized(vframe* vf) { return (vf->is_compiled_frame() && vf->fr().can_be_deoptimized()); } }; VM_EnterInterpOnlyMode::VM_EnterInterpOnlyMode(JvmtiThreadState *state) : _state(state) { } void VM_EnterInterpOnlyMode::doit() { // Set up the current stack depth for later tracking _state->invalidate_cur_stack_depth(); _state->enter_interp_only_mode(); JavaThread *thread = _state->get_thread(); if (thread->has_last_Java_frame()) { // If running in fullspeed mode, single stepping is implemented // as follows: first, the interpreter does not dispatch to // compiled code for threads that have single stepping enabled; // second, we deoptimize all methods on the thread's stack when // interpreted-only mode is enabled the first time for a given // thread (nothing to do if no Java frames yet). int num_marked = 0; ResourceMark resMark; RegisterMap rm(thread, false); for (vframe* vf = thread->last_java_vframe(&rm); vf; vf = vf->sender()) { if (can_be_deoptimized(vf)) { ((compiledVFrame*) vf)->code()->mark_for_deoptimization(); ++num_marked; } } if (num_marked > 0) { VM_Deoptimize op; VMThread::execute(&op); } } } /////////////////////////////////////////////////////////////// // // VM_ChangeSingleStep // class VM_ChangeSingleStep : public VM_Operation { private: bool _on; public: VM_ChangeSingleStep(bool on); VMOp_Type type() const { return VMOp_ChangeSingleStep; } bool allow_nested_vm_operations() const { return true; } void doit(); // method definition is after definition of JvmtiEventControllerPrivate because of scoping }; VM_ChangeSingleStep::VM_ChangeSingleStep(bool on) : _on(on) { } /////////////////////////////////////////////////////////////// // // JvmtiEventControllerPrivate // // Private internal implementation methods for JvmtiEventController. // // These methods are thread safe either because they are called // in early VM initialization which is single threaded, or they // hold the JvmtiThreadState_lock. // class JvmtiEventControllerPrivate : public AllStatic { static bool _initialized; public: static void set_should_post_single_step(bool on); static void enter_interp_only_mode(JvmtiThreadState *state); static void leave_interp_only_mode(JvmtiThreadState *state); static void recompute_enabled(); static jlong recompute_env_enabled(JvmtiEnvBase* env); static jlong recompute_env_thread_enabled(JvmtiEnvThreadState* ets, JvmtiThreadState* state); static jlong recompute_thread_enabled(JvmtiThreadState *state); static void event_init(); static void set_user_enabled(JvmtiEnvBase *env, JavaThread *thread, jvmtiEvent event_type, bool enabled); static void set_event_callbacks(JvmtiEnvBase *env, const jvmtiEventCallbacks* callbacks, jint size_of_callbacks); static void set_extension_event_callback(JvmtiEnvBase *env, jint extension_event_index, jvmtiExtensionEvent callback); static void set_frame_pop(JvmtiEnvThreadState *env_thread, JvmtiFramePop fpop); static void clear_frame_pop(JvmtiEnvThreadState *env_thread, JvmtiFramePop fpop); static void clear_to_frame_pop(JvmtiEnvThreadState *env_thread, JvmtiFramePop fpop); static void change_field_watch(jvmtiEvent event_type, bool added); static void thread_started(JavaThread *thread); static void thread_ended(JavaThread *thread); static void env_initialize(JvmtiEnvBase *env); static void env_dispose(JvmtiEnvBase *env); static void vm_start(); static void vm_init(); static void vm_death(); static void trace_changed(JvmtiThreadState *state, jlong now_enabled, jlong changed); static void trace_changed(jlong now_enabled, jlong changed); }; bool JvmtiEventControllerPrivate::_initialized = false; void JvmtiEventControllerPrivate::set_should_post_single_step(bool on) { // we have permission to do this, VM op doesn't JvmtiExport::set_should_post_single_step(on); } // When _on == true, we use the safepoint interpreter dispatch table // to allow us to find the single step points. Otherwise, we switch // back to the regular interpreter dispatch table. // Note: We call Interpreter::notice_safepoints() and ignore_safepoints() // in a VM_Operation to safely make the dispatch table switch. We // no longer rely on the safepoint mechanism to do any of this work // for us. void VM_ChangeSingleStep::doit() { log_debug(interpreter, safepoint)("changing single step to '%s'", _on ? "on" : "off"); JvmtiEventControllerPrivate::set_should_post_single_step(_on); if (_on) { Interpreter::notice_safepoints(); } else { Interpreter::ignore_safepoints(); } } void JvmtiEventControllerPrivate::enter_interp_only_mode(JvmtiThreadState *state) { EC_TRACE(("[%s] # Entering interpreter only mode", JvmtiTrace::safe_get_thread_name(state->get_thread()))); VM_EnterInterpOnlyMode op(state); VMThread::execute(&op); } void JvmtiEventControllerPrivate::leave_interp_only_mode(JvmtiThreadState *state) { EC_TRACE(("[%s] # Leaving interpreter only mode", JvmtiTrace::safe_get_thread_name(state->get_thread()))); state->leave_interp_only_mode(); } void JvmtiEventControllerPrivate::trace_changed(JvmtiThreadState *state, jlong now_enabled, jlong changed) { #ifdef JVMTI_TRACE if (JvmtiTrace::trace_event_controller()) { SafeResourceMark rm; // traces standard events only for (int ei = JVMTI_MIN_EVENT_TYPE_VAL; ei <= JVMTI_MAX_EVENT_TYPE_VAL; ++ei) { jlong bit = JvmtiEventEnabled::bit_for((jvmtiEvent)ei); if (changed & bit) { // it changed, print it log_trace(jvmti)("[%s] # %s event %s", JvmtiTrace::safe_get_thread_name(state->get_thread()), (now_enabled & bit)? "Enabling" : "Disabling", JvmtiTrace::event_name((jvmtiEvent)ei)); } } } #endif /*JVMTI_TRACE */ } void JvmtiEventControllerPrivate::trace_changed(jlong now_enabled, jlong changed) { #ifdef JVMTI_TRACE if (JvmtiTrace::trace_event_controller()) { SafeResourceMark rm; // traces standard events only for (int ei = JVMTI_MIN_EVENT_TYPE_VAL; ei <= JVMTI_MAX_EVENT_TYPE_VAL; ++ei) { jlong bit = JvmtiEventEnabled::bit_for((jvmtiEvent)ei); if (changed & bit) { // it changed, print it log_trace(jvmti)("[-] # %s event %s", (now_enabled & bit)? "Enabling" : "Disabling", JvmtiTrace::event_name((jvmtiEvent)ei)); } } } #endif /*JVMTI_TRACE */ } // For the specified env: compute the currently truly enabled events // set external state accordingly. // Return value and set value must include all events. // But outside this class, only non-thread-filtered events can be queried.. jlong JvmtiEventControllerPrivate::recompute_env_enabled(JvmtiEnvBase* env) { jlong was_enabled = env->env_event_enable()->_event_enabled.get_bits(); jlong now_enabled = env->env_event_enable()->_event_callback_enabled.get_bits() & env->env_event_enable()->_event_user_enabled.get_bits(); switch (env->phase()) { case JVMTI_PHASE_PRIMORDIAL: case JVMTI_PHASE_ONLOAD: // only these events allowed in primordial or onload phase now_enabled &= (EARLY_EVENT_BITS & ~THREAD_FILTERED_EVENT_BITS); break; case JVMTI_PHASE_START: // only these events allowed in start phase now_enabled &= EARLY_EVENT_BITS; break; case JVMTI_PHASE_LIVE: // all events allowed during live phase break; case JVMTI_PHASE_DEAD: // no events allowed when dead now_enabled = 0; break; default: assert(false, "no other phases - sanity check"); break; } // will we really send these events to this env env->env_event_enable()->_event_enabled.set_bits(now_enabled); trace_changed(now_enabled, (now_enabled ^ was_enabled) & ~THREAD_FILTERED_EVENT_BITS); return now_enabled; } // For the specified env and thread: compute the currently truly enabled events // set external state accordingly. Only thread-filtered events are included. jlong JvmtiEventControllerPrivate::recompute_env_thread_enabled(JvmtiEnvThreadState* ets, JvmtiThreadState* state) { JvmtiEnv *env = ets->get_env(); jlong was_enabled = ets->event_enable()->_event_enabled.get_bits(); jlong now_enabled = THREAD_FILTERED_EVENT_BITS & env->env_event_enable()->_event_callback_enabled.get_bits() & (env->env_event_enable()->_event_user_enabled.get_bits() | ets->event_enable()->_event_user_enabled.get_bits()); // for frame pops and field watchs, computed enabled state // is only true if an event has been requested if (!ets->has_frame_pops()) { now_enabled &= ~FRAME_POP_BIT; } if (*((int *)JvmtiExport::get_field_access_count_addr()) == 0) { now_enabled &= ~FIELD_ACCESS_BIT; } if (*((int *)JvmtiExport::get_field_modification_count_addr()) == 0) { now_enabled &= ~FIELD_MODIFICATION_BIT; } switch (JvmtiEnv::get_phase()) { case JVMTI_PHASE_DEAD: // no events allowed when dead now_enabled = 0; break; default: break; } // if anything changed do update if (now_enabled != was_enabled) { // will we really send these events to this thread x env ets->event_enable()->_event_enabled.set_bits(now_enabled); // If the enabled status of the single step or breakpoint events changed, // the location status may need to change as well. jlong changed = now_enabled ^ was_enabled; if (changed & SINGLE_STEP_BIT) { ets->reset_current_location(JVMTI_EVENT_SINGLE_STEP, (now_enabled & SINGLE_STEP_BIT) != 0); } if (changed & BREAKPOINT_BIT) { ets->reset_current_location(JVMTI_EVENT_BREAKPOINT, (now_enabled & BREAKPOINT_BIT) != 0); } trace_changed(state, now_enabled, changed); } return now_enabled; } // For the specified thread: compute the currently truly enabled events // set external state accordingly. Only thread-filtered events are included. jlong JvmtiEventControllerPrivate::recompute_thread_enabled(JvmtiThreadState *state) { if (state == NULL) { // associated JavaThread is exiting return (jlong)0; } julong was_any_env_enabled = state->thread_event_enable()->_event_enabled.get_bits(); julong any_env_enabled = 0; // JVMTI_EVENT_FRAME_POP can be disabled (in the case FRAME_POP_BIT is not set), // but we need to set interp_only if some JvmtiEnvThreadState has frame pop set // to clear the request bool has_frame_pops = false; { // This iteration will include JvmtiEnvThreadStates whose environments // have been disposed. These JvmtiEnvThreadStates must not be filtered // as recompute must be called on them to disable their events, JvmtiEnvThreadStateIterator it(state); for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) { any_env_enabled |= recompute_env_thread_enabled(ets, state); has_frame_pops |= ets->has_frame_pops(); } } if (any_env_enabled != was_any_env_enabled) { // mark if event is truly enabled on this thread in any environment state->thread_event_enable()->_event_enabled.set_bits(any_env_enabled); // update the JavaThread cached value for thread-specific should_post_on_exceptions value bool should_post_on_exceptions = (any_env_enabled & SHOULD_POST_ON_EXCEPTIONS_BITS) != 0; state->set_should_post_on_exceptions(should_post_on_exceptions); } // compute interp_only mode bool should_be_interp = (any_env_enabled & INTERP_EVENT_BITS) != 0 || has_frame_pops; bool is_now_interp = state->is_interp_only_mode(); if (should_be_interp != is_now_interp) { if (should_be_interp) { enter_interp_only_mode(state); } else { leave_interp_only_mode(state); } } return any_env_enabled; } // Compute truly enabled events - meaning if the event can and could be // sent. An event is truly enabled if it is user enabled on the thread // or globally user enabled, but only if there is a callback or event hook // for it and, for field watch and frame pop, one has been set. // Compute if truly enabled, per thread, per environment, per combination // (thread x environment), and overall. These merges are true if any is true. // True per thread if some environment has callback set and the event is globally // enabled or enabled for this thread. // True per environment if the callback is set and the event is globally // enabled in this environment or enabled for any thread in this environment. // True per combination if the environment has the callback set and the // event is globally enabled in this environment or the event is enabled // for this thread and environment. // // All states transitions dependent on these transitions are also handled here. void JvmtiEventControllerPrivate::recompute_enabled() { assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), "sanity check"); // event enabled for any thread in any environment julong was_any_env_thread_enabled = JvmtiEventController::_universal_global_event_enabled.get_bits(); julong any_env_thread_enabled = 0; EC_TRACE(("[-] # recompute enabled - before " JULONG_FORMAT_X, was_any_env_thread_enabled)); // compute non-thread-filters events. // This must be done separately from thread-filtered events, since some // events can occur before any threads exist. JvmtiEnvIterator it; for (JvmtiEnvBase* env = it.first(); env != NULL; env = it.next(env)) { any_env_thread_enabled |= recompute_env_enabled(env); } // We need to create any missing jvmti_thread_state if there are globally set thread // filtered events and there weren't last time if ( (any_env_thread_enabled & THREAD_FILTERED_EVENT_BITS) != 0 && (was_any_env_thread_enabled & THREAD_FILTERED_EVENT_BITS) == 0) { for (JavaThreadIteratorWithHandle jtiwh; JavaThread *tp = jtiwh.next(); ) { // state_for_while_locked() makes tp->is_exiting() check JvmtiThreadState::state_for_while_locked(tp); // create the thread state if missing } } // compute and set thread-filtered events for (JvmtiThreadState *state = JvmtiThreadState::first(); state != NULL; state = state->next()) { any_env_thread_enabled |= recompute_thread_enabled(state); } // set universal state (across all envs and threads) jlong delta = any_env_thread_enabled ^ was_any_env_thread_enabled; if (delta != 0) { JvmtiExport::set_should_post_field_access((any_env_thread_enabled & FIELD_ACCESS_BIT) != 0); JvmtiExport::set_should_post_field_modification((any_env_thread_enabled & FIELD_MODIFICATION_BIT) != 0); JvmtiExport::set_should_post_class_load((any_env_thread_enabled & CLASS_LOAD_BIT) != 0); JvmtiExport::set_should_post_class_file_load_hook((any_env_thread_enabled & CLASS_FILE_LOAD_HOOK_BIT) != 0); JvmtiExport::set_should_post_native_method_bind((any_env_thread_enabled & NATIVE_METHOD_BIND_BIT) != 0); JvmtiExport::set_should_post_dynamic_code_generated((any_env_thread_enabled & DYNAMIC_CODE_GENERATED_BIT) != 0); JvmtiExport::set_should_post_data_dump((any_env_thread_enabled & DATA_DUMP_BIT) != 0); JvmtiExport::set_should_post_class_prepare((any_env_thread_enabled & CLASS_PREPARE_BIT) != 0); JvmtiExport::set_should_post_class_unload((any_env_thread_enabled & CLASS_UNLOAD_BIT) != 0); JvmtiExport::set_should_post_monitor_contended_enter((any_env_thread_enabled & MONITOR_CONTENDED_ENTER_BIT) != 0); JvmtiExport::set_should_post_monitor_contended_entered((any_env_thread_enabled & MONITOR_CONTENDED_ENTERED_BIT) != 0); JvmtiExport::set_should_post_monitor_wait((any_env_thread_enabled & MONITOR_WAIT_BIT) != 0); JvmtiExport::set_should_post_monitor_waited((any_env_thread_enabled & MONITOR_WAITED_BIT) != 0); JvmtiExport::set_should_post_garbage_collection_start((any_env_thread_enabled & GARBAGE_COLLECTION_START_BIT) != 0); JvmtiExport::set_should_post_garbage_collection_finish((any_env_thread_enabled & GARBAGE_COLLECTION_FINISH_BIT) != 0); JvmtiExport::set_should_post_object_free((any_env_thread_enabled & OBJECT_FREE_BIT) != 0); JvmtiExport::set_should_post_resource_exhausted((any_env_thread_enabled & RESOURCE_EXHAUSTED_BIT) != 0); JvmtiExport::set_should_post_compiled_method_load((any_env_thread_enabled & COMPILED_METHOD_LOAD_BIT) != 0); JvmtiExport::set_should_post_compiled_method_unload((any_env_thread_enabled & COMPILED_METHOD_UNLOAD_BIT) != 0); JvmtiExport::set_should_post_vm_object_alloc((any_env_thread_enabled & VM_OBJECT_ALLOC_BIT) != 0); JvmtiExport::set_should_post_sampled_object_alloc((any_env_thread_enabled & SAMPLED_OBJECT_ALLOC_BIT) != 0); // need this if we want thread events or we need them to init data JvmtiExport::set_should_post_thread_life((any_env_thread_enabled & NEED_THREAD_LIFE_EVENTS) != 0); // If single stepping is turned on or off, execute the VM op to change it. if (delta & SINGLE_STEP_BIT) { switch (JvmtiEnv::get_phase()) { case JVMTI_PHASE_DEAD: // If the VM is dying we can't execute VM ops break; case JVMTI_PHASE_LIVE: { VM_ChangeSingleStep op((any_env_thread_enabled & SINGLE_STEP_BIT) != 0); VMThread::execute(&op); break; } default: assert(false, "should never come here before live phase"); break; } } // set global truly enabled, that is, any thread in any environment JvmtiEventController::_universal_global_event_enabled.set_bits(any_env_thread_enabled); // set global should_post_on_exceptions JvmtiExport::set_should_post_on_exceptions((any_env_thread_enabled & SHOULD_POST_ON_EXCEPTIONS_BITS) != 0); } EC_TRACE(("[-] # recompute enabled - after " JULONG_FORMAT_X, any_env_thread_enabled)); } void JvmtiEventControllerPrivate::thread_started(JavaThread *thread) { assert(thread->is_Java_thread(), "Must be JavaThread"); assert(thread == Thread::current(), "must be current thread"); assert(JvmtiEnvBase::environments_might_exist(), "to enter event controller, JVM TI environments must exist"); EC_TRACE(("[%s] # thread started", JvmtiTrace::safe_get_thread_name(thread))); // if we have any thread filtered events globally enabled, create/update the thread state if ((JvmtiEventController::_universal_global_event_enabled.get_bits() & THREAD_FILTERED_EVENT_BITS) != 0) { MutexLocker mu(JvmtiThreadState_lock); // create the thread state if missing JvmtiThreadState *state = JvmtiThreadState::state_for_while_locked(thread); if (state != NULL) { // skip threads with no JVMTI thread state recompute_thread_enabled(state); } } } void JvmtiEventControllerPrivate::thread_ended(JavaThread *thread) { // Removes the JvmtiThreadState associated with the specified thread. // May be called after all environments have been disposed. assert(JvmtiThreadState_lock->is_locked(), "sanity check"); EC_TRACE(("[%s] # thread ended", JvmtiTrace::safe_get_thread_name(thread))); JvmtiThreadState *state = thread->jvmti_thread_state(); assert(state != NULL, "else why are we here?"); delete state; } void JvmtiEventControllerPrivate::set_event_callbacks(JvmtiEnvBase *env, const jvmtiEventCallbacks* callbacks, jint size_of_callbacks) { assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), "sanity check"); EC_TRACE(("[*] # set event callbacks")); env->set_event_callbacks(callbacks, size_of_callbacks); jlong enabled_bits = 0; for (int ei = JVMTI_MIN_EVENT_TYPE_VAL; ei <= JVMTI_MAX_EVENT_TYPE_VAL; ++ei) { jvmtiEvent evt_t = (jvmtiEvent)ei; if (env->has_callback(evt_t)) { enabled_bits |= JvmtiEventEnabled::bit_for(evt_t); } } env->env_event_enable()->_event_callback_enabled.set_bits(enabled_bits); recompute_enabled(); } void JvmtiEventControllerPrivate::set_extension_event_callback(JvmtiEnvBase *env, jint extension_event_index, jvmtiExtensionEvent callback) { assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), "sanity check"); EC_TRACE(("[*] # set extension event callback")); // extension events are allocated below JVMTI_MIN_EVENT_TYPE_VAL assert(extension_event_index >= (jint)EXT_MIN_EVENT_TYPE_VAL && extension_event_index <= (jint)EXT_MAX_EVENT_TYPE_VAL, "sanity check"); // As the bits for both standard (jvmtiEvent) and extension // (jvmtiExtEvents) are stored in the same word we cast here to // jvmtiEvent to set/clear the bit for this extension event. jvmtiEvent event_type = (jvmtiEvent)extension_event_index; // Prevent a possible race condition where events are re-enabled by a call to // set event callbacks, where the DisposeEnvironment occurs after the boiler-plate // environment check and before the lock is acquired. // We can safely do the is_valid check now, as JvmtiThreadState_lock is held. bool enabling = (callback != NULL) && (env->is_valid()); env->env_event_enable()->set_user_enabled(event_type, enabling); // update the callback jvmtiExtEventCallbacks* ext_callbacks = env->ext_callbacks(); switch (extension_event_index) { case EXT_EVENT_CLASS_UNLOAD : ext_callbacks->ClassUnload = callback; break; default: ShouldNotReachHere(); } // update the callback enable/disable bit jlong enabled_bits = env->env_event_enable()->_event_callback_enabled.get_bits(); jlong bit_for = JvmtiEventEnabled::bit_for(event_type); if (enabling) { enabled_bits |= bit_for; } else { enabled_bits &= ~bit_for; } env->env_event_enable()->_event_callback_enabled.set_bits(enabled_bits); recompute_enabled(); } void JvmtiEventControllerPrivate::env_initialize(JvmtiEnvBase *env) { assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), "sanity check"); EC_TRACE(("[*] # env initialize")); if (JvmtiEnvBase::is_vm_live()) { // if we didn't initialize event info already (this is a late // launched environment), do it now. event_init(); } env->initialize(); // add the JvmtiEnvThreadState to each JvmtiThreadState for (JvmtiThreadState *state = JvmtiThreadState::first(); state != NULL; state = state->next()) { state->add_env(env); assert((JvmtiEnv*)(state->env_thread_state(env)->get_env()) == env, "sanity check"); } JvmtiEventControllerPrivate::recompute_enabled(); } void JvmtiEventControllerPrivate::env_dispose(JvmtiEnvBase *env) { assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), "sanity check"); EC_TRACE(("[*] # env dispose")); // Before the environment is marked disposed, disable all events on this // environment (by zapping the callbacks). As a result, the disposed // environment will not call event handlers. set_event_callbacks(env, NULL, 0); for (jint extension_event_index = EXT_MIN_EVENT_TYPE_VAL; extension_event_index <= EXT_MAX_EVENT_TYPE_VAL; ++extension_event_index) { set_extension_event_callback(env, extension_event_index, NULL); } // Let the environment finish disposing itself. env->env_dispose(); } void JvmtiEventControllerPrivate::set_user_enabled(JvmtiEnvBase *env, JavaThread *thread, jvmtiEvent event_type, bool enabled) { assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), "sanity check"); EC_TRACE(("[%s] # user %s event %s", thread==NULL? "ALL": JvmtiTrace::safe_get_thread_name(thread), enabled? "enabled" : "disabled", JvmtiTrace::event_name(event_type))); if (thread == NULL) { env->env_event_enable()->set_user_enabled(event_type, enabled); } else { // create the thread state (if it didn't exist before) JvmtiThreadState *state = JvmtiThreadState::state_for_while_locked(thread); if (state != NULL) { state->env_thread_state(env)->event_enable()->set_user_enabled(event_type, enabled); } } recompute_enabled(); } void JvmtiEventControllerPrivate::set_frame_pop(JvmtiEnvThreadState *ets, JvmtiFramePop fpop) { EC_TRACE(("[%s] # set frame pop - frame=%d", JvmtiTrace::safe_get_thread_name(ets->get_thread()), fpop.frame_number() )); ets->get_frame_pops()->set(fpop); recompute_thread_enabled(ets->get_thread()->jvmti_thread_state()); } void JvmtiEventControllerPrivate::clear_frame_pop(JvmtiEnvThreadState *ets, JvmtiFramePop fpop) { EC_TRACE(("[%s] # clear frame pop - frame=%d", JvmtiTrace::safe_get_thread_name(ets->get_thread()), fpop.frame_number() )); ets->get_frame_pops()->clear(fpop); recompute_thread_enabled(ets->get_thread()->jvmti_thread_state()); } void JvmtiEventControllerPrivate::clear_to_frame_pop(JvmtiEnvThreadState *ets, JvmtiFramePop fpop) { int cleared_cnt = ets->get_frame_pops()->clear_to(fpop); EC_TRACE(("[%s] # clear to frame pop - frame=%d, count=%d", JvmtiTrace::safe_get_thread_name(ets->get_thread()), fpop.frame_number(), cleared_cnt )); if (cleared_cnt > 0) { recompute_thread_enabled(ets->get_thread()->jvmti_thread_state()); } } void JvmtiEventControllerPrivate::change_field_watch(jvmtiEvent event_type, bool added) { int *count_addr; switch (event_type) { case JVMTI_EVENT_FIELD_MODIFICATION: count_addr = (int *)JvmtiExport::get_field_modification_count_addr(); break; case JVMTI_EVENT_FIELD_ACCESS: count_addr = (int *)JvmtiExport::get_field_access_count_addr(); break; default: assert(false, "incorrect event"); return; } EC_TRACE(("[-] # change field watch - %s %s count=%d", event_type==JVMTI_EVENT_FIELD_MODIFICATION? "modification" : "access", added? "add" : "remove", *count_addr)); if (added) { (*count_addr)++; if (*count_addr == 1) { recompute_enabled(); } } else { if (*count_addr > 0) { (*count_addr)--; if (*count_addr == 0) { recompute_enabled(); } } else { assert(false, "field watch out of phase"); } } } void JvmtiEventControllerPrivate::event_init() { assert(JvmtiThreadState_lock->is_locked(), "sanity check"); if (_initialized) { return; } EC_TRACE(("[-] # VM live")); #ifdef ASSERT // check that our idea and the spec's idea of threaded events match for (int ei = JVMTI_MIN_EVENT_TYPE_VAL; ei <= JVMTI_MAX_EVENT_TYPE_VAL; ++ei) { jlong bit = JvmtiEventEnabled::bit_for((jvmtiEvent)ei); assert(((THREAD_FILTERED_EVENT_BITS & bit) != 0) == JvmtiUtil::event_threaded(ei), "thread filtered event list does not match"); } #endif _initialized = true; } void JvmtiEventControllerPrivate::vm_start() { // some events are now able to be enabled (phase has changed) JvmtiEventControllerPrivate::recompute_enabled(); } void JvmtiEventControllerPrivate::vm_init() { event_init(); // all the events are now able to be enabled (phase has changed) JvmtiEventControllerPrivate::recompute_enabled(); } void JvmtiEventControllerPrivate::vm_death() { // events are disabled (phase has changed) JvmtiEventControllerPrivate::recompute_enabled(); } /////////////////////////////////////////////////////////////// // // JvmtiEventController // JvmtiEventEnabled JvmtiEventController::_universal_global_event_enabled; bool JvmtiEventController::is_global_event(jvmtiEvent event_type) { assert(is_valid_event_type(event_type), "invalid event type"); jlong bit_for = ((jlong)1) << (event_type - TOTAL_MIN_EVENT_TYPE_VAL); return((bit_for & GLOBAL_EVENT_BITS)!=0); } void JvmtiEventController::set_user_enabled(JvmtiEnvBase *env, JavaThread *thread, jvmtiEvent event_type, bool enabled) { if (Threads::number_of_threads() == 0) { // during early VM start-up locks don't exist, but we are safely single threaded, // call the functionality without holding the JvmtiThreadState_lock. JvmtiEventControllerPrivate::set_user_enabled(env, thread, event_type, enabled); } else { MutexLocker mu(JvmtiThreadState_lock); JvmtiEventControllerPrivate::set_user_enabled(env, thread, event_type, enabled); } } void JvmtiEventController::set_event_callbacks(JvmtiEnvBase *env, const jvmtiEventCallbacks* callbacks, jint size_of_callbacks) { if (Threads::number_of_threads() == 0) { // during early VM start-up locks don't exist, but we are safely single threaded, // call the functionality without holding the JvmtiThreadState_lock. JvmtiEventControllerPrivate::set_event_callbacks(env, callbacks, size_of_callbacks); } else { MutexLocker mu(JvmtiThreadState_lock); JvmtiEventControllerPrivate::set_event_callbacks(env, callbacks, size_of_callbacks); } } void JvmtiEventController::set_extension_event_callback(JvmtiEnvBase *env, jint extension_event_index, jvmtiExtensionEvent callback) { if (Threads::number_of_threads() == 0) { JvmtiEventControllerPrivate::set_extension_event_callback(env, extension_event_index, callback); } else { MutexLocker mu(JvmtiThreadState_lock); JvmtiEventControllerPrivate::set_extension_event_callback(env, extension_event_index, callback); } } void JvmtiEventController::set_frame_pop(JvmtiEnvThreadState *ets, JvmtiFramePop fpop) { MutexLocker mu(SafepointSynchronize::is_at_safepoint() ? NULL : JvmtiThreadState_lock); JvmtiEventControllerPrivate::set_frame_pop(ets, fpop); } void JvmtiEventController::clear_frame_pop(JvmtiEnvThreadState *ets, JvmtiFramePop fpop) { MutexLocker mu(SafepointSynchronize::is_at_safepoint() ? NULL : JvmtiThreadState_lock); JvmtiEventControllerPrivate::clear_frame_pop(ets, fpop); } void JvmtiEventController::clear_to_frame_pop(JvmtiEnvThreadState *ets, JvmtiFramePop fpop) { MutexLocker mu(SafepointSynchronize::is_at_safepoint() ? NULL : JvmtiThreadState_lock); JvmtiEventControllerPrivate::clear_to_frame_pop(ets, fpop); } void JvmtiEventController::change_field_watch(jvmtiEvent event_type, bool added) { MutexLocker mu(JvmtiThreadState_lock); JvmtiEventControllerPrivate::change_field_watch(event_type, added); } void JvmtiEventController::thread_started(JavaThread *thread) { // operates only on the current thread // JvmtiThreadState_lock grabbed only if needed. JvmtiEventControllerPrivate::thread_started(thread); } void JvmtiEventController::thread_ended(JavaThread *thread) { // operates only on the current thread // JvmtiThreadState_lock grabbed only if needed. JvmtiEventControllerPrivate::thread_ended(thread); } void JvmtiEventController::env_initialize(JvmtiEnvBase *env) { if (Threads::number_of_threads() == 0) { // during early VM start-up locks don't exist, but we are safely single threaded, // call the functionality without holding the JvmtiThreadState_lock. JvmtiEventControllerPrivate::env_initialize(env); } else { MutexLocker mu(JvmtiThreadState_lock); JvmtiEventControllerPrivate::env_initialize(env); } } void JvmtiEventController::env_dispose(JvmtiEnvBase *env) { if (Threads::number_of_threads() == 0) { // during early VM start-up locks don't exist, but we are safely single threaded, // call the functionality without holding the JvmtiThreadState_lock. JvmtiEventControllerPrivate::env_dispose(env); } else { MutexLocker mu(JvmtiThreadState_lock); JvmtiEventControllerPrivate::env_dispose(env); } } void JvmtiEventController::vm_start() { if (JvmtiEnvBase::environments_might_exist()) { MutexLocker mu(JvmtiThreadState_lock); JvmtiEventControllerPrivate::vm_start(); } } void JvmtiEventController::vm_init() { if (JvmtiEnvBase::environments_might_exist()) { MutexLocker mu(JvmtiThreadState_lock); JvmtiEventControllerPrivate::vm_init(); } } void JvmtiEventController::vm_death() { if (JvmtiEnvBase::environments_might_exist()) { MutexLocker mu(JvmtiThreadState_lock); JvmtiEventControllerPrivate::vm_death(); } }