Java example source code file (jvmtiEventController.cpp)
The jvmtiEventController.cpp Java example source code
/*
* Copyright (c) 2003, 2013, 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 "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.hpp"
#include "runtime/vframe.hpp"
#include "runtime/vframe_hp.hpp"
#include "runtime/vmThread.hpp"
#include "runtime/vm_operations.hpp"
#ifdef JVMTI_TRACE
#define EC_TRACE(out) do { \
if (JvmtiTrace::trace_event_controller()) { \
SafeResourceMark rm; \
tty->print_cr 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));
// 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;
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 |
VM_START_BIT | VM_INIT_BIT | VM_DEATH_BIT | NATIVE_METHOD_BIND_BIT |
THREAD_START_BIT | THREAD_END_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 != 0)
{
}
///////////////////////////////////////////////////////////////
//
// 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);
}
// This change must always be occur when at a safepoint.
// Being at a safepoint causes the interpreter to use the
// safepoint dispatch table which we overload to find single
// step points. Just to be sure that it has been set, we
// call notice_safepoints when turning on single stepping.
// When we leave our current safepoint, should_post_single_step
// will be checked by the interpreter, and the table kept
// or changed accordingly.
void VM_ChangeSingleStep::doit() {
JvmtiEventControllerPrivate::set_should_post_single_step(_on);
if (_on) {
Interpreter::notice_safepoints();
}
}
void JvmtiEventControllerPrivate::enter_interp_only_mode(JvmtiThreadState *state) {
EC_TRACE(("JVMTI [%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(("JVMTI [%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
tty->print_cr("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
tty->print_cr("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 (JvmtiEnv::get_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;
}
// 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;
}
jlong was_any_env_enabled = state->thread_event_enable()->_event_enabled.get_bits();
jlong any_env_enabled = 0;
{
// This iteration will include JvmtiEnvThreadStates whoses 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);
}
}
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);
// compute interp_only mode
bool should_be_interp = (any_env_enabled & INTERP_EVENT_BITS) != 0;
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);
}
}
// 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);
}
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
jlong was_any_env_thread_enabled = JvmtiEventController::_universal_global_event_enabled.get_bits();
jlong any_env_thread_enabled = 0;
EC_TRACE(("JVMTI [-] # recompute enabled - before %llx", 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) {
assert(JvmtiEnv::is_vm_live() || (JvmtiEnv::get_phase()==JVMTI_PHASE_START),
"thread filtered events should not be enabled when VM not in start or live phase");
{
MutexLocker mu(Threads_lock); //hold the Threads_lock for the iteration
for (JavaThread *tp = Threads::first(); tp != NULL; tp = tp->next()) {
// state_for_while_locked() makes tp->is_exiting() check
JvmtiThreadState::state_for_while_locked(tp); // create the thread state if missing
}
}// release Threads_lock
}
// 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);
// 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(("JVMTI [-] # recompute enabled - after %llx", 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(("JVMTI [%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(("JVMTI [%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(("JVMTI [*] # 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(("JVMTI [*] # 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(("JVMTI [*] # 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(("JVMTI [*] # 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(("JVMTI [%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(("JVMTI [%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(("JVMTI [%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(("JVMTI [%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(("JVMTI [-] # 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(("JVMTI [-] # 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(JvmtiThreadState_lock);
JvmtiEventControllerPrivate::set_frame_pop(ets, fpop);
}
void
JvmtiEventController::clear_frame_pop(JvmtiEnvThreadState *ets, JvmtiFramePop fpop) {
MutexLocker mu(JvmtiThreadState_lock);
JvmtiEventControllerPrivate::clear_frame_pop(ets, fpop);
}
void
JvmtiEventController::clear_to_frame_pop(JvmtiEnvThreadState *ets, JvmtiFramePop fpop) {
MutexLocker mu(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();
}
}
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