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android / platform / external / jetbrains / jdk8u_hotspot / a482fc01a461b60a024295f544eaa063285fee2d / . / src / share / vm / prims / jvmtiExport.cpp
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/*
* Copyright (c) 2003, 2016, 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/systemDictionary.hpp"
#include "code/nmethod.hpp"
#include "code/pcDesc.hpp"
#include "code/scopeDesc.hpp"
#include "interpreter/interpreter.hpp"
#include "jvmtifiles/jvmtiEnv.hpp"
#include "memory/resourceArea.hpp"
#include "oops/objArrayKlass.hpp"
#include "oops/objArrayOop.hpp"
#include "prims/jvmtiCodeBlobEvents.hpp"
#include "prims/jvmtiEventController.hpp"
#include "prims/jvmtiEventController.inline.hpp"
#include "prims/jvmtiExport.hpp"
#include "prims/jvmtiImpl.hpp"
#include "prims/jvmtiManageCapabilities.hpp"
#include "prims/jvmtiRawMonitor.hpp"
#include "prims/jvmtiTagMap.hpp"
#include "prims/jvmtiThreadState.inline.hpp"
#include "prims/jvmtiRedefineClasses.hpp"
#include "runtime/arguments.hpp"
#include "runtime/handles.hpp"
#include "runtime/interfaceSupport.hpp"
#include "runtime/objectMonitor.hpp"
#include "runtime/objectMonitor.inline.hpp"
#include "runtime/thread.inline.hpp"
#include "runtime/vframe.hpp"
#include "services/attachListener.hpp"
#include "services/serviceUtil.hpp"
#include "utilities/macros.hpp"
#if INCLUDE_ALL_GCS
#include "gc_implementation/parallelScavenge/psMarkSweep.hpp"
#endif // INCLUDE_ALL_GCS
PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC
#ifdef JVMTI_TRACE
#define EVT_TRACE(evt,out) if ((JvmtiTrace::event_trace_flags(evt) & JvmtiTrace::SHOW_EVENT_SENT) != 0) { SafeResourceMark rm; tty->print_cr out; }
#define EVT_TRIG_TRACE(evt,out) if ((JvmtiTrace::event_trace_flags(evt) & JvmtiTrace::SHOW_EVENT_TRIGGER) != 0) { SafeResourceMark rm; tty->print_cr out; }
#else
#define EVT_TRIG_TRACE(evt,out)
#define EVT_TRACE(evt,out)
#endif
///////////////////////////////////////////////////////////////
//
// JvmtiEventTransition
//
// TO DO --
// more handle purging
// Use this for JavaThreads and state is _thread_in_vm.
class JvmtiJavaThreadEventTransition : StackObj {
private:
ResourceMark _rm;
ThreadToNativeFromVM _transition;
HandleMark _hm;
public:
JvmtiJavaThreadEventTransition(JavaThread *thread) :
_rm(),
_transition(thread),
_hm(thread) {};
};
// For JavaThreads which are not in _thread_in_vm state
// and other system threads use this.
class JvmtiThreadEventTransition : StackObj {
private:
ResourceMark _rm;
HandleMark _hm;
JavaThreadState _saved_state;
JavaThread *_jthread;
public:
JvmtiThreadEventTransition(Thread *thread) : _rm(), _hm() {
if (thread->is_Java_thread()) {
_jthread = (JavaThread *)thread;
_saved_state = _jthread->thread_state();
if (_saved_state == _thread_in_Java) {
ThreadStateTransition::transition_from_java(_jthread, _thread_in_native);
} else {
ThreadStateTransition::transition(_jthread, _saved_state, _thread_in_native);
}
} else {
_jthread = NULL;
}
}
~JvmtiThreadEventTransition() {
if (_jthread != NULL)
ThreadStateTransition::transition_from_native(_jthread, _saved_state);
}
};
///////////////////////////////////////////////////////////////
//
// JvmtiEventMark
//
class JvmtiEventMark : public StackObj {
private:
JavaThread *_thread;
JNIEnv* _jni_env;
bool _exception_detected;
bool _exception_caught;
#if 0
JNIHandleBlock* _hblock;
#endif
public:
JvmtiEventMark(JavaThread *thread) : _thread(thread),
_jni_env(thread->jni_environment()) {
#if 0
_hblock = thread->active_handles();
_hblock->clear_thoroughly(); // so we can be safe
#else
// we want to use the code above - but that needs the JNIHandle changes - later...
// for now, steal JNI push local frame code
JvmtiThreadState *state = thread->jvmti_thread_state();
// we are before an event.
// Save current jvmti thread exception state.
if (state != NULL) {
_exception_detected = state->is_exception_detected();
_exception_caught = state->is_exception_caught();
} else {
_exception_detected = false;
_exception_caught = false;
}
JNIHandleBlock* old_handles = thread->active_handles();
JNIHandleBlock* new_handles = JNIHandleBlock::allocate_block(thread);
assert(new_handles != NULL, "should not be NULL");
new_handles->set_pop_frame_link(old_handles);
thread->set_active_handles(new_handles);
#endif
assert(thread == JavaThread::current(), "thread must be current!");
thread->frame_anchor()->make_walkable(thread);
};
~JvmtiEventMark() {
#if 0
_hblock->clear(); // for consistency with future correct behavior
#else
// we want to use the code above - but that needs the JNIHandle changes - later...
// for now, steal JNI pop local frame code
JNIHandleBlock* old_handles = _thread->active_handles();
JNIHandleBlock* new_handles = old_handles->pop_frame_link();
assert(new_handles != NULL, "should not be NULL");
_thread->set_active_handles(new_handles);
// Note that we set the pop_frame_link to NULL explicitly, otherwise
// the release_block call will release the blocks.
old_handles->set_pop_frame_link(NULL);
JNIHandleBlock::release_block(old_handles, _thread); // may block
#endif
JvmtiThreadState* state = _thread->jvmti_thread_state();
// we are continuing after an event.
if (state != NULL) {
// Restore the jvmti thread exception state.
if (_exception_detected) {
state->set_exception_detected();
}
if (_exception_caught) {
state->set_exception_caught();
}
}
}
#if 0
jobject to_jobject(oop obj) { return obj == NULL? NULL : _hblock->allocate_handle_fast(obj); }
#else
// we want to use the code above - but that needs the JNIHandle changes - later...
// for now, use regular make_local
jobject to_jobject(oop obj) { return JNIHandles::make_local(_thread,obj); }
#endif
jclass to_jclass(Klass* klass) { return (klass == NULL ? NULL : (jclass)to_jobject(klass->java_mirror())); }
jmethodID to_jmethodID(methodHandle method) { return method->jmethod_id(); }
JNIEnv* jni_env() { return _jni_env; }
};
class JvmtiThreadEventMark : public JvmtiEventMark {
private:
jthread _jt;
public:
JvmtiThreadEventMark(JavaThread *thread) :
JvmtiEventMark(thread) {
_jt = (jthread)(to_jobject(thread->threadObj()));
};
jthread jni_thread() { return _jt; }
};
class JvmtiClassEventMark : public JvmtiThreadEventMark {
private:
jclass _jc;
public:
JvmtiClassEventMark(JavaThread *thread, Klass* klass) :
JvmtiThreadEventMark(thread) {
_jc = to_jclass(klass);
};
jclass jni_class() { return _jc; }
};
class JvmtiMethodEventMark : public JvmtiThreadEventMark {
private:
jmethodID _mid;
public:
JvmtiMethodEventMark(JavaThread *thread, methodHandle method) :
JvmtiThreadEventMark(thread),
_mid(to_jmethodID(method)) {};
jmethodID jni_methodID() { return _mid; }
};
class JvmtiLocationEventMark : public JvmtiMethodEventMark {
private:
jlocation _loc;
public:
JvmtiLocationEventMark(JavaThread *thread, methodHandle method, address location) :
JvmtiMethodEventMark(thread, method),
_loc(location - method->code_base()) {};
jlocation location() { return _loc; }
};
class JvmtiExceptionEventMark : public JvmtiLocationEventMark {
private:
jobject _exc;
public:
JvmtiExceptionEventMark(JavaThread *thread, methodHandle method, address location, Handle exception) :
JvmtiLocationEventMark(thread, method, location),
_exc(to_jobject(exception())) {};
jobject exception() { return _exc; }
};
class JvmtiClassFileLoadEventMark : public JvmtiThreadEventMark {
private:
const char *_class_name;
jobject _jloader;
jobject _protection_domain;
jclass _class_being_redefined;
public:
JvmtiClassFileLoadEventMark(JavaThread *thread, Symbol* name,
Handle class_loader, Handle prot_domain, KlassHandle *class_being_redefined) : JvmtiThreadEventMark(thread) {
_class_name = name != NULL? name->as_utf8() : NULL;
_jloader = (jobject)to_jobject(class_loader());
_protection_domain = (jobject)to_jobject(prot_domain());
if (class_being_redefined == NULL) {
_class_being_redefined = NULL;
} else {
_class_being_redefined = (jclass)to_jclass((*class_being_redefined)());
}
};
const char *class_name() {
return _class_name;
}
jobject jloader() {
return _jloader;
}
jobject protection_domain() {
return _protection_domain;
}
jclass class_being_redefined() {
return _class_being_redefined;
}
};
//////////////////////////////////////////////////////////////////////////////
int JvmtiExport::_field_access_count = 0;
int JvmtiExport::_field_modification_count = 0;
bool JvmtiExport::_can_access_local_variables = false;
bool JvmtiExport::_can_hotswap_or_post_breakpoint = false;
bool JvmtiExport::_can_modify_any_class = false;
bool JvmtiExport::_can_walk_any_space = false;
bool JvmtiExport::_has_redefined_a_class = false;
bool JvmtiExport::_all_dependencies_are_recorded = false;
//
// field access management
//
// interpreter generator needs the address of the counter
address JvmtiExport::get_field_access_count_addr() {
// We don't grab a lock because we don't want to
// serialize field access between all threads. This means that a
// thread on another processor can see the wrong count value and
// may either miss making a needed call into post_field_access()
// or will make an unneeded call into post_field_access(). We pay
// this price to avoid slowing down the VM when we aren't watching
// field accesses.
// Other access/mutation safe by virtue of being in VM state.
return (address)(&_field_access_count);
}
//
// field modification management
//
// interpreter generator needs the address of the counter
address JvmtiExport::get_field_modification_count_addr() {
// We don't grab a lock because we don't
// want to serialize field modification between all threads. This
// means that a thread on another processor can see the wrong
// count value and may either miss making a needed call into
// post_field_modification() or will make an unneeded call into
// post_field_modification(). We pay this price to avoid slowing
// down the VM when we aren't watching field modifications.
// Other access/mutation safe by virtue of being in VM state.
return (address)(&_field_modification_count);
}
///////////////////////////////////////////////////////////////
// Functions needed by java.lang.instrument for starting up javaagent.
///////////////////////////////////////////////////////////////
jint
JvmtiExport::get_jvmti_interface(JavaVM *jvm, void **penv, jint version) {
// The JVMTI_VERSION_INTERFACE_JVMTI part of the version number
// has already been validated in JNI GetEnv().
int major, minor, micro;
// micro version doesn't matter here (yet?)
decode_version_values(version, &major, &minor, &micro);
switch (major) {
case 1:
switch (minor) {
case 0: // version 1.0.<micro> is recognized
case 1: // version 1.1.<micro> is recognized
case 2: // version 1.2.<micro> is recognized
break;
default:
return JNI_EVERSION; // unsupported minor version number
}
break;
default:
return JNI_EVERSION; // unsupported major version number
}
if (JvmtiEnv::get_phase() == JVMTI_PHASE_LIVE) {
JavaThread* current_thread = (JavaThread*) ThreadLocalStorage::thread();
// transition code: native to VM
ThreadInVMfromNative __tiv(current_thread);
VM_ENTRY_BASE(jvmtiEnv*, JvmtiExport::get_jvmti_interface, current_thread)
debug_only(VMNativeEntryWrapper __vew;)
JvmtiEnv *jvmti_env = JvmtiEnv::create_a_jvmti(version);
*penv = jvmti_env->jvmti_external(); // actual type is jvmtiEnv* -- not to be confused with JvmtiEnv*
return JNI_OK;
} else if (JvmtiEnv::get_phase() == JVMTI_PHASE_ONLOAD) {
// not live, no thread to transition
JvmtiEnv *jvmti_env = JvmtiEnv::create_a_jvmti(version);
*penv = jvmti_env->jvmti_external(); // actual type is jvmtiEnv* -- not to be confused with JvmtiEnv*
return JNI_OK;
} else {
// Called at the wrong time
*penv = NULL;
return JNI_EDETACHED;
}
}
void
JvmtiExport::decode_version_values(jint version, int * major, int * minor,
int * micro) {
*major = (version & JVMTI_VERSION_MASK_MAJOR) >> JVMTI_VERSION_SHIFT_MAJOR;
*minor = (version & JVMTI_VERSION_MASK_MINOR) >> JVMTI_VERSION_SHIFT_MINOR;
*micro = (version & JVMTI_VERSION_MASK_MICRO) >> JVMTI_VERSION_SHIFT_MICRO;
}
void JvmtiExport::enter_primordial_phase() {
JvmtiEnvBase::set_phase(JVMTI_PHASE_PRIMORDIAL);
}
void JvmtiExport::enter_start_phase() {
JvmtiManageCapabilities::recompute_always_capabilities();
JvmtiEnvBase::set_phase(JVMTI_PHASE_START);
}
void JvmtiExport::enter_onload_phase() {
JvmtiEnvBase::set_phase(JVMTI_PHASE_ONLOAD);
}
void JvmtiExport::enter_live_phase() {
JvmtiEnvBase::set_phase(JVMTI_PHASE_LIVE);
}
//
// JVMTI events that the VM posts to the debugger and also startup agent
// and call the agent's premain() for java.lang.instrument.
//
void JvmtiExport::post_vm_start() {
EVT_TRIG_TRACE(JVMTI_EVENT_VM_START, ("JVMTI Trg VM start event triggered" ));
// can now enable some events
JvmtiEventController::vm_start();
JvmtiEnvIterator it;
for (JvmtiEnv* env = it.first(); env != NULL; env = it.next(env)) {
if (env->is_enabled(JVMTI_EVENT_VM_START)) {
EVT_TRACE(JVMTI_EVENT_VM_START, ("JVMTI Evt VM start event sent" ));
JavaThread *thread = JavaThread::current();
JvmtiThreadEventMark jem(thread);
JvmtiJavaThreadEventTransition jet(thread);
jvmtiEventVMStart callback = env->callbacks()->VMStart;
if (callback != NULL) {
(*callback)(env->jvmti_external(), jem.jni_env());
}
}
}
}
void JvmtiExport::post_vm_initialized() {
EVT_TRIG_TRACE(JVMTI_EVENT_VM_INIT, ("JVMTI Trg VM init event triggered" ));
// can now enable events
JvmtiEventController::vm_init();
JvmtiEnvIterator it;
for (JvmtiEnv* env = it.first(); env != NULL; env = it.next(env)) {
if (env->is_enabled(JVMTI_EVENT_VM_INIT)) {
EVT_TRACE(JVMTI_EVENT_VM_INIT, ("JVMTI Evt VM init event sent" ));
JavaThread *thread = JavaThread::current();
JvmtiThreadEventMark jem(thread);
JvmtiJavaThreadEventTransition jet(thread);
jvmtiEventVMInit callback = env->callbacks()->VMInit;
if (callback != NULL) {
(*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread());
}
}
}
}
void JvmtiExport::post_vm_death() {
EVT_TRIG_TRACE(JVMTI_EVENT_VM_DEATH, ("JVMTI Trg VM death event triggered" ));
JvmtiEnvIterator it;
for (JvmtiEnv* env = it.first(); env != NULL; env = it.next(env)) {
if (env->is_enabled(JVMTI_EVENT_VM_DEATH)) {
EVT_TRACE(JVMTI_EVENT_VM_DEATH, ("JVMTI Evt VM death event sent" ));
JavaThread *thread = JavaThread::current();
JvmtiEventMark jem(thread);
JvmtiJavaThreadEventTransition jet(thread);
jvmtiEventVMDeath callback = env->callbacks()->VMDeath;
if (callback != NULL) {
(*callback)(env->jvmti_external(), jem.jni_env());
}
}
}
JvmtiEnvBase::set_phase(JVMTI_PHASE_DEAD);
JvmtiEventController::vm_death();
}
char**
JvmtiExport::get_all_native_method_prefixes(int* count_ptr) {
// Have to grab JVMTI thread state lock to be sure environment doesn't
// go away while we iterate them. No locks during VM bring-up.
if (Threads::number_of_threads() == 0 || SafepointSynchronize::is_at_safepoint()) {
return JvmtiEnvBase::get_all_native_method_prefixes(count_ptr);
} else {
MutexLocker mu(JvmtiThreadState_lock);
return JvmtiEnvBase::get_all_native_method_prefixes(count_ptr);
}
}
class JvmtiClassFileLoadHookPoster : public StackObj {
private:
Symbol* _h_name;
Handle _class_loader;
Handle _h_protection_domain;
unsigned char ** _data_ptr;
unsigned char ** _end_ptr;
JavaThread * _thread;
jint _curr_len;
unsigned char * _curr_data;
JvmtiEnv * _curr_env;
JvmtiCachedClassFileData ** _cached_class_file_ptr;
JvmtiThreadState * _state;
KlassHandle * _h_class_being_redefined;
JvmtiClassLoadKind _load_kind;
public:
inline JvmtiClassFileLoadHookPoster(Symbol* h_name, Handle class_loader,
Handle h_protection_domain,
unsigned char **data_ptr, unsigned char **end_ptr,
JvmtiCachedClassFileData **cache_ptr) {
_h_name = h_name;
_class_loader = class_loader;
_h_protection_domain = h_protection_domain;
_data_ptr = data_ptr;
_end_ptr = end_ptr;
_thread = JavaThread::current();
_curr_len = *end_ptr - *data_ptr;
_curr_data = *data_ptr;
_curr_env = NULL;
_cached_class_file_ptr = cache_ptr;
_state = _thread->jvmti_thread_state();
if (_state != NULL) {
_h_class_being_redefined = _state->get_class_being_redefined();
_load_kind = _state->get_class_load_kind();
// Clear class_being_redefined flag here. The action
// from agent handler could generate a new class file load
// hook event and if it is not cleared the new event generated
// from regular class file load could have this stale redefined
// class handle info.
_state->clear_class_being_redefined();
} else {
// redefine and retransform will always set the thread state
_h_class_being_redefined = (KlassHandle *) NULL;
_load_kind = jvmti_class_load_kind_load;
}
}
void post() {
// EVT_TRIG_TRACE(JVMTI_EVENT_CLASS_FILE_LOAD_HOOK,
// ("JVMTI [%s] class file load hook event triggered",
// JvmtiTrace::safe_get_thread_name(_thread)));
post_all_envs();
copy_modified_data();
}
private:
void post_all_envs() {
if (_load_kind != jvmti_class_load_kind_retransform) {
// for class load and redefine,
// call the non-retransformable agents
JvmtiEnvIterator it;
for (JvmtiEnv* env = it.first(); env != NULL; env = it.next(env)) {
if (!env->is_retransformable() && env->is_enabled(JVMTI_EVENT_CLASS_FILE_LOAD_HOOK)) {
// non-retransformable agents cannot retransform back,
// so no need to cache the original class file bytes
post_to_env(env, false);
}
}
}
JvmtiEnvIterator it;
for (JvmtiEnv* env = it.first(); env != NULL; env = it.next(env)) {
// retransformable agents get all events
if (env->is_retransformable() && env->is_enabled(JVMTI_EVENT_CLASS_FILE_LOAD_HOOK)) {
// retransformable agents need to cache the original class file
// bytes if changes are made via the ClassFileLoadHook
post_to_env(env, true);
}
}
}
void post_to_env(JvmtiEnv* env, bool caching_needed) {
unsigned char *new_data = NULL;
jint new_len = 0;
// EVT_TRACE(JVMTI_EVENT_CLASS_FILE_LOAD_HOOK,
// ("JVMTI [%s] class file load hook event sent %s data_ptr = %d, data_len = %d",
// JvmtiTrace::safe_get_thread_name(_thread),
// _h_name == NULL ? "NULL" : _h_name->as_utf8(),
// _curr_data, _curr_len ));
JvmtiClassFileLoadEventMark jem(_thread, _h_name, _class_loader,
_h_protection_domain,
_h_class_being_redefined);
JvmtiJavaThreadEventTransition jet(_thread);
JNIEnv* jni_env = (JvmtiEnv::get_phase() == JVMTI_PHASE_PRIMORDIAL)?
NULL : jem.jni_env();
jvmtiEventClassFileLoadHook callback = env->callbacks()->ClassFileLoadHook;
if (callback != NULL) {
(*callback)(env->jvmti_external(), jni_env,
jem.class_being_redefined(),
jem.jloader(), jem.class_name(),
jem.protection_domain(),
_curr_len, _curr_data,
&new_len, &new_data);
}
if (new_data != NULL) {
// this agent has modified class data.
if (caching_needed && *_cached_class_file_ptr == NULL) {
// data has been changed by the new retransformable agent
// and it hasn't already been cached, cache it
JvmtiCachedClassFileData *p;
p = (JvmtiCachedClassFileData *)os::malloc(
offset_of(JvmtiCachedClassFileData, data) + _curr_len, mtInternal);
if (p == NULL) {
vm_exit_out_of_memory(offset_of(JvmtiCachedClassFileData, data) + _curr_len,
OOM_MALLOC_ERROR,
"unable to allocate cached copy of original class bytes");
}
p->length = _curr_len;
memcpy(p->data, _curr_data, _curr_len);
*_cached_class_file_ptr = p;
}
if (_curr_data != *_data_ptr) {
// curr_data is previous agent modified class data.
// And this has been changed by the new agent so
// we can delete it now.
_curr_env->Deallocate(_curr_data);
}
// Class file data has changed by the current agent.
_curr_data = new_data;
_curr_len = new_len;
// Save the current agent env we need this to deallocate the
// memory allocated by this agent.
_curr_env = env;
}
}
void copy_modified_data() {
// if one of the agent has modified class file data.
// Copy modified class data to new resources array.
if (_curr_data != *_data_ptr) {
*_data_ptr = NEW_RESOURCE_ARRAY(u1, _curr_len);
memcpy(*_data_ptr, _curr_data, _curr_len);
*_end_ptr = *_data_ptr + _curr_len;
_curr_env->Deallocate(_curr_data);
}
}
};
bool JvmtiExport::_should_post_class_file_load_hook = false;
// this entry is for class file load hook on class load, redefine and retransform
void JvmtiExport::post_class_file_load_hook(Symbol* h_name,
Handle class_loader,
Handle h_protection_domain,
unsigned char **data_ptr,
unsigned char **end_ptr,
JvmtiCachedClassFileData **cache_ptr) {
JvmtiClassFileLoadHookPoster poster(h_name, class_loader,
h_protection_domain,
data_ptr, end_ptr,
cache_ptr);
poster.post();
}
void JvmtiExport::report_unsupported(bool on) {
// If any JVMTI service is turned on, we need to exit before native code
// tries to access nonexistant services.
if (on) {
vm_exit_during_initialization("Java Kernel does not support JVMTI.");
}
}
static inline Klass* oop_to_klass(oop obj) {
Klass* k = obj->klass();
// if the object is a java.lang.Class then return the java mirror
if (k == SystemDictionary::Class_klass()) {
if (!java_lang_Class::is_primitive(obj)) {
k = java_lang_Class::as_Klass(obj);
assert(k != NULL, "class for non-primitive mirror must exist");
}
}
return k;
}
class JvmtiVMObjectAllocEventMark : public JvmtiClassEventMark {
private:
jobject _jobj;
jlong _size;
public:
JvmtiVMObjectAllocEventMark(JavaThread *thread, oop obj) : JvmtiClassEventMark(thread, oop_to_klass(obj)) {
_jobj = (jobject)to_jobject(obj);
_size = obj->size() * wordSize;
};
jobject jni_jobject() { return _jobj; }
jlong size() { return _size; }
};
class JvmtiCompiledMethodLoadEventMark : public JvmtiMethodEventMark {
private:
jint _code_size;
const void *_code_data;
jint _map_length;
jvmtiAddrLocationMap *_map;
const void *_compile_info;
public:
JvmtiCompiledMethodLoadEventMark(JavaThread *thread, nmethod *nm, void* compile_info_ptr = NULL)
: JvmtiMethodEventMark(thread,methodHandle(thread, nm->method())) {
_code_data = nm->insts_begin();
_code_size = nm->insts_size();
_compile_info = compile_info_ptr; // Set void pointer of compiledMethodLoad Event. Default value is NULL.
JvmtiCodeBlobEvents::build_jvmti_addr_location_map(nm, &_map, &_map_length);
}
~JvmtiCompiledMethodLoadEventMark() {
FREE_C_HEAP_ARRAY(jvmtiAddrLocationMap, _map, mtInternal);
}
jint code_size() { return _code_size; }
const void *code_data() { return _code_data; }
jint map_length() { return _map_length; }
const jvmtiAddrLocationMap* map() { return _map; }
const void *compile_info() { return _compile_info; }
};
class JvmtiMonitorEventMark : public JvmtiThreadEventMark {
private:
jobject _jobj;
public:
JvmtiMonitorEventMark(JavaThread *thread, oop object)
: JvmtiThreadEventMark(thread){
_jobj = to_jobject(object);
}
jobject jni_object() { return _jobj; }
};
///////////////////////////////////////////////////////////////
//
// pending CompiledMethodUnload support
//
void JvmtiExport::post_compiled_method_unload(
jmethodID method, const void *code_begin) {
JavaThread* thread = JavaThread::current();
EVT_TRIG_TRACE(JVMTI_EVENT_COMPILED_METHOD_UNLOAD,
("JVMTI [%s] method compile unload event triggered",
JvmtiTrace::safe_get_thread_name(thread)));
// post the event for each environment that has this event enabled.
JvmtiEnvIterator it;
for (JvmtiEnv* env = it.first(); env != NULL; env = it.next(env)) {
if (env->is_enabled(JVMTI_EVENT_COMPILED_METHOD_UNLOAD)) {
EVT_TRACE(JVMTI_EVENT_COMPILED_METHOD_UNLOAD,
("JVMTI [%s] class compile method unload event sent jmethodID " PTR_FORMAT,
JvmtiTrace::safe_get_thread_name(thread), method));
ResourceMark rm(thread);
JvmtiEventMark jem(thread);
JvmtiJavaThreadEventTransition jet(thread);
jvmtiEventCompiledMethodUnload callback = env->callbacks()->CompiledMethodUnload;
if (callback != NULL) {
(*callback)(env->jvmti_external(), method, code_begin);
}
}
}
}
///////////////////////////////////////////////////////////////
//
// JvmtiExport
//
void JvmtiExport::post_raw_breakpoint(JavaThread *thread, Method* method, address location) {
HandleMark hm(thread);
methodHandle mh(thread, method);
JvmtiThreadState *state = thread->jvmti_thread_state();
if (state == NULL) {
return;
}
EVT_TRIG_TRACE(JVMTI_EVENT_BREAKPOINT, ("JVMTI [%s] Trg Breakpoint triggered",
JvmtiTrace::safe_get_thread_name(thread)));
JvmtiEnvThreadStateIterator it(state);
for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) {
ets->compare_and_set_current_location(mh(), location, JVMTI_EVENT_BREAKPOINT);
if (!ets->breakpoint_posted() && ets->is_enabled(JVMTI_EVENT_BREAKPOINT)) {
ThreadState old_os_state = thread->osthread()->get_state();
thread->osthread()->set_state(BREAKPOINTED);
EVT_TRACE(JVMTI_EVENT_BREAKPOINT, ("JVMTI [%s] Evt Breakpoint sent %s.%s @ %d",
JvmtiTrace::safe_get_thread_name(thread),
(mh() == NULL) ? "NULL" : mh()->klass_name()->as_C_string(),
(mh() == NULL) ? "NULL" : mh()->name()->as_C_string(),
location - mh()->code_base() ));
JvmtiEnv *env = ets->get_env();
JvmtiLocationEventMark jem(thread, mh, location);
JvmtiJavaThreadEventTransition jet(thread);
jvmtiEventBreakpoint callback = env->callbacks()->Breakpoint;
if (callback != NULL) {
(*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(),
jem.jni_methodID(), jem.location());
}
ets->set_breakpoint_posted();
thread->osthread()->set_state(old_os_state);
}
}
}
//////////////////////////////////////////////////////////////////////////////
bool JvmtiExport::_can_get_source_debug_extension = false;
bool JvmtiExport::_can_maintain_original_method_order = false;
bool JvmtiExport::_can_post_interpreter_events = false;
bool JvmtiExport::_can_post_on_exceptions = false;
bool JvmtiExport::_can_post_breakpoint = false;
bool JvmtiExport::_can_post_field_access = false;
bool JvmtiExport::_can_post_field_modification = false;
bool JvmtiExport::_can_post_method_entry = false;
bool JvmtiExport::_can_post_method_exit = false;
bool JvmtiExport::_can_pop_frame = false;
bool JvmtiExport::_can_force_early_return = false;
bool JvmtiExport::_should_post_single_step = false;
bool JvmtiExport::_should_post_field_access = false;
bool JvmtiExport::_should_post_field_modification = false;
bool JvmtiExport::_should_post_class_load = false;
bool JvmtiExport::_should_post_class_prepare = false;
bool JvmtiExport::_should_post_class_unload = false;
bool JvmtiExport::_should_post_thread_life = false;
bool JvmtiExport::_should_clean_up_heap_objects = false;
bool JvmtiExport::_should_post_native_method_bind = false;
bool JvmtiExport::_should_post_dynamic_code_generated = false;
bool JvmtiExport::_should_post_data_dump = false;
bool JvmtiExport::_should_post_compiled_method_load = false;
bool JvmtiExport::_should_post_compiled_method_unload = false;
bool JvmtiExport::_should_post_monitor_contended_enter = false;
bool JvmtiExport::_should_post_monitor_contended_entered = false;
bool JvmtiExport::_should_post_monitor_wait = false;
bool JvmtiExport::_should_post_monitor_waited = false;
bool JvmtiExport::_should_post_garbage_collection_start = false;
bool JvmtiExport::_should_post_garbage_collection_finish = false;
bool JvmtiExport::_should_post_object_free = false;
bool JvmtiExport::_should_post_resource_exhausted = false;
bool JvmtiExport::_should_post_vm_object_alloc = false;
bool JvmtiExport::_should_post_on_exceptions = false;
////////////////////////////////////////////////////////////////////////////////////////////////
//
// JVMTI single step management
//
void JvmtiExport::at_single_stepping_point(JavaThread *thread, Method* method, address location) {
assert(JvmtiExport::should_post_single_step(), "must be single stepping");
HandleMark hm(thread);
methodHandle mh(thread, method);
// update information about current location and post a step event
JvmtiThreadState *state = thread->jvmti_thread_state();
if (state == NULL) {
return;
}
EVT_TRIG_TRACE(JVMTI_EVENT_SINGLE_STEP, ("JVMTI [%s] Trg Single Step triggered",
JvmtiTrace::safe_get_thread_name(thread)));
if (!state->hide_single_stepping()) {
if (state->is_pending_step_for_popframe()) {
state->process_pending_step_for_popframe();
}
if (state->is_pending_step_for_earlyret()) {
state->process_pending_step_for_earlyret();
}
JvmtiExport::post_single_step(thread, mh(), location);
}
}
void JvmtiExport::expose_single_stepping(JavaThread *thread) {
JvmtiThreadState *state = thread->jvmti_thread_state();
if (state != NULL) {
state->clear_hide_single_stepping();
}
}
bool JvmtiExport::hide_single_stepping(JavaThread *thread) {
JvmtiThreadState *state = thread->jvmti_thread_state();
if (state != NULL && state->is_enabled(JVMTI_EVENT_SINGLE_STEP)) {
state->set_hide_single_stepping();
return true;
} else {
return false;
}
}
void JvmtiExport::post_class_load(JavaThread *thread, Klass* klass) {
HandleMark hm(thread);
KlassHandle kh(thread, klass);
EVT_TRIG_TRACE(JVMTI_EVENT_CLASS_LOAD, ("JVMTI [%s] Trg Class Load triggered",
JvmtiTrace::safe_get_thread_name(thread)));
JvmtiThreadState* state = thread->jvmti_thread_state();
if (state == NULL) {
return;
}
JvmtiEnvThreadStateIterator it(state);
for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) {
if (ets->is_enabled(JVMTI_EVENT_CLASS_LOAD)) {
EVT_TRACE(JVMTI_EVENT_CLASS_LOAD, ("JVMTI [%s] Evt Class Load sent %s",
JvmtiTrace::safe_get_thread_name(thread),
kh()==NULL? "NULL" : kh()->external_name() ));
JvmtiEnv *env = ets->get_env();
JvmtiClassEventMark jem(thread, kh());
JvmtiJavaThreadEventTransition jet(thread);
jvmtiEventClassLoad callback = env->callbacks()->ClassLoad;
if (callback != NULL) {
(*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(), jem.jni_class());
}
}
}
}
void JvmtiExport::post_class_prepare(JavaThread *thread, Klass* klass) {
HandleMark hm(thread);
KlassHandle kh(thread, klass);
EVT_TRIG_TRACE(JVMTI_EVENT_CLASS_PREPARE, ("JVMTI [%s] Trg Class Prepare triggered",
JvmtiTrace::safe_get_thread_name(thread)));
JvmtiThreadState* state = thread->jvmti_thread_state();
if (state == NULL) {
return;
}
JvmtiEnvThreadStateIterator it(state);
for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) {
if (ets->is_enabled(JVMTI_EVENT_CLASS_PREPARE)) {
EVT_TRACE(JVMTI_EVENT_CLASS_PREPARE, ("JVMTI [%s] Evt Class Prepare sent %s",
JvmtiTrace::safe_get_thread_name(thread),
kh()==NULL? "NULL" : kh()->external_name() ));
JvmtiEnv *env = ets->get_env();
JvmtiClassEventMark jem(thread, kh());
JvmtiJavaThreadEventTransition jet(thread);
jvmtiEventClassPrepare callback = env->callbacks()->ClassPrepare;
if (callback != NULL) {
(*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(), jem.jni_class());
}
}
}
}
void JvmtiExport::post_class_unload(Klass* klass) {
Thread *thread = Thread::current();
HandleMark hm(thread);
KlassHandle kh(thread, klass);
EVT_TRIG_TRACE(EXT_EVENT_CLASS_UNLOAD, ("JVMTI [?] Trg Class Unload triggered" ));
if (JvmtiEventController::is_enabled((jvmtiEvent)EXT_EVENT_CLASS_UNLOAD)) {
assert(thread->is_VM_thread(), "wrong thread");
// get JavaThread for whom we are proxy
JavaThread *real_thread =
(JavaThread *)((VMThread *)thread)->vm_operation()->calling_thread();
JvmtiEnvIterator it;
for (JvmtiEnv* env = it.first(); env != NULL; env = it.next(env)) {
if (env->is_enabled((jvmtiEvent)EXT_EVENT_CLASS_UNLOAD)) {
EVT_TRACE(EXT_EVENT_CLASS_UNLOAD, ("JVMTI [?] Evt Class Unload sent %s",
kh()==NULL? "NULL" : kh()->external_name() ));
// do everything manually, since this is a proxy - needs special care
JNIEnv* jni_env = real_thread->jni_environment();
jthread jt = (jthread)JNIHandles::make_local(real_thread, real_thread->threadObj());
jclass jk = (jclass)JNIHandles::make_local(real_thread, kh()->java_mirror());
// Before we call the JVMTI agent, we have to set the state in the
// thread for which we are proxying.
JavaThreadState prev_state = real_thread->thread_state();
assert(((Thread *)real_thread)->is_ConcurrentGC_thread() ||
(real_thread->is_Java_thread() && prev_state == _thread_blocked),
"should be ConcurrentGCThread or JavaThread at safepoint");
real_thread->set_thread_state(_thread_in_native);
jvmtiExtensionEvent callback = env->ext_callbacks()->ClassUnload;
if (callback != NULL) {
(*callback)(env->jvmti_external(), jni_env, jt, jk);
}
assert(real_thread->thread_state() == _thread_in_native,
"JavaThread should be in native");
real_thread->set_thread_state(prev_state);
JNIHandles::destroy_local(jk);
JNIHandles::destroy_local(jt);
}
}
}
}
void JvmtiExport::post_thread_start(JavaThread *thread) {
assert(thread->thread_state() == _thread_in_vm, "must be in vm state");
EVT_TRIG_TRACE(JVMTI_EVENT_THREAD_START, ("JVMTI [%s] Trg Thread Start event triggered",
JvmtiTrace::safe_get_thread_name(thread)));
// do JVMTI thread initialization (if needed)
JvmtiEventController::thread_started(thread);
// Do not post thread start event for hidden java thread.
if (JvmtiEventController::is_enabled(JVMTI_EVENT_THREAD_START) &&
!thread->is_hidden_from_external_view()) {
JvmtiEnvIterator it;
for (JvmtiEnv* env = it.first(); env != NULL; env = it.next(env)) {
if (env->is_enabled(JVMTI_EVENT_THREAD_START)) {
EVT_TRACE(JVMTI_EVENT_THREAD_START, ("JVMTI [%s] Evt Thread Start event sent",
JvmtiTrace::safe_get_thread_name(thread) ));
JvmtiThreadEventMark jem(thread);
JvmtiJavaThreadEventTransition jet(thread);
jvmtiEventThreadStart callback = env->callbacks()->ThreadStart;
if (callback != NULL) {
(*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread());
}
}
}
}
}
void JvmtiExport::post_thread_end(JavaThread *thread) {
EVT_TRIG_TRACE(JVMTI_EVENT_THREAD_END, ("JVMTI [%s] Trg Thread End event triggered",
JvmtiTrace::safe_get_thread_name(thread)));
JvmtiThreadState *state = thread->jvmti_thread_state();
if (state == NULL) {
return;
}
// Do not post thread end event for hidden java thread.
if (state->is_enabled(JVMTI_EVENT_THREAD_END) &&
!thread->is_hidden_from_external_view()) {
JvmtiEnvThreadStateIterator it(state);
for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) {
if (ets->is_enabled(JVMTI_EVENT_THREAD_END)) {
EVT_TRACE(JVMTI_EVENT_THREAD_END, ("JVMTI [%s] Evt Thread End event sent",
JvmtiTrace::safe_get_thread_name(thread) ));
JvmtiEnv *env = ets->get_env();
JvmtiThreadEventMark jem(thread);
JvmtiJavaThreadEventTransition jet(thread);
jvmtiEventThreadEnd callback = env->callbacks()->ThreadEnd;
if (callback != NULL) {
(*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread());
}
}
}
}
}
void JvmtiExport::post_object_free(JvmtiEnv* env, jlong tag) {
assert(SafepointSynchronize::is_at_safepoint(), "must be executed at safepoint");
assert(env->is_enabled(JVMTI_EVENT_OBJECT_FREE), "checking");
EVT_TRIG_TRACE(JVMTI_EVENT_OBJECT_FREE, ("JVMTI [?] Trg Object Free triggered" ));
EVT_TRACE(JVMTI_EVENT_OBJECT_FREE, ("JVMTI [?] Evt Object Free sent"));
jvmtiEventObjectFree callback = env->callbacks()->ObjectFree;
if (callback != NULL) {
(*callback)(env->jvmti_external(), tag);
}
}
void JvmtiExport::post_resource_exhausted(jint resource_exhausted_flags, const char* description) {
EVT_TRIG_TRACE(JVMTI_EVENT_RESOURCE_EXHAUSTED, ("JVMTI Trg resource exhausted event triggered" ));
JvmtiEnvIterator it;
for (JvmtiEnv* env = it.first(); env != NULL; env = it.next(env)) {
if (env->is_enabled(JVMTI_EVENT_RESOURCE_EXHAUSTED)) {
EVT_TRACE(JVMTI_EVENT_RESOURCE_EXHAUSTED, ("JVMTI Evt resource exhausted event sent" ));
JavaThread *thread = JavaThread::current();
JvmtiThreadEventMark jem(thread);
JvmtiJavaThreadEventTransition jet(thread);
jvmtiEventResourceExhausted callback = env->callbacks()->ResourceExhausted;
if (callback != NULL) {
(*callback)(env->jvmti_external(), jem.jni_env(),
resource_exhausted_flags, NULL, description);
}
}
}
}
void JvmtiExport::post_method_entry(JavaThread *thread, Method* method, frame current_frame) {
HandleMark hm(thread);
methodHandle mh(thread, method);
EVT_TRIG_TRACE(JVMTI_EVENT_METHOD_ENTRY, ("JVMTI [%s] Trg Method Entry triggered %s.%s",
JvmtiTrace::safe_get_thread_name(thread),
(mh() == NULL) ? "NULL" : mh()->klass_name()->as_C_string(),
(mh() == NULL) ? "NULL" : mh()->name()->as_C_string() ));
JvmtiThreadState* state = thread->jvmti_thread_state();
if (state == NULL || !state->is_interp_only_mode()) {
// for any thread that actually wants method entry, interp_only_mode is set
return;
}
state->incr_cur_stack_depth();
if (state->is_enabled(JVMTI_EVENT_METHOD_ENTRY)) {
JvmtiEnvThreadStateIterator it(state);
for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) {
if (ets->is_enabled(JVMTI_EVENT_METHOD_ENTRY)) {
EVT_TRACE(JVMTI_EVENT_METHOD_ENTRY, ("JVMTI [%s] Evt Method Entry sent %s.%s",
JvmtiTrace::safe_get_thread_name(thread),
(mh() == NULL) ? "NULL" : mh()->klass_name()->as_C_string(),
(mh() == NULL) ? "NULL" : mh()->name()->as_C_string() ));
JvmtiEnv *env = ets->get_env();
JvmtiMethodEventMark jem(thread, mh);
JvmtiJavaThreadEventTransition jet(thread);
jvmtiEventMethodEntry callback = env->callbacks()->MethodEntry;
if (callback != NULL) {
(*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(), jem.jni_methodID());
}
}
}
}
}
void JvmtiExport::post_method_exit(JavaThread *thread, Method* method, frame current_frame) {
HandleMark hm(thread);
methodHandle mh(thread, method);
EVT_TRIG_TRACE(JVMTI_EVENT_METHOD_EXIT, ("JVMTI [%s] Trg Method Exit triggered %s.%s",
JvmtiTrace::safe_get_thread_name(thread),
(mh() == NULL) ? "NULL" : mh()->klass_name()->as_C_string(),
(mh() == NULL) ? "NULL" : mh()->name()->as_C_string() ));
JvmtiThreadState *state = thread->jvmti_thread_state();
if (state == NULL || !state->is_interp_only_mode()) {
// for any thread that actually wants method exit, interp_only_mode is set
return;
}
// return a flag when a method terminates by throwing an exception
// i.e. if an exception is thrown and it's not caught by the current method
bool exception_exit = state->is_exception_detected() && !state->is_exception_caught();
if (state->is_enabled(JVMTI_EVENT_METHOD_EXIT)) {
Handle result;
jvalue value;
value.j = 0L;
// if the method hasn't been popped because of an exception then we populate
// the return_value parameter for the callback. At this point we only have
// the address of a "raw result" and we just call into the interpreter to
// convert this into a jvalue.
if (!exception_exit) {
oop oop_result;
BasicType type = current_frame.interpreter_frame_result(&oop_result, &value);
if (type == T_OBJECT || type == T_ARRAY) {
result = Handle(thread, oop_result);
}
}
JvmtiEnvThreadStateIterator it(state);
for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) {
if (ets->is_enabled(JVMTI_EVENT_METHOD_EXIT)) {
EVT_TRACE(JVMTI_EVENT_METHOD_EXIT, ("JVMTI [%s] Evt Method Exit sent %s.%s",
JvmtiTrace::safe_get_thread_name(thread),
(mh() == NULL) ? "NULL" : mh()->klass_name()->as_C_string(),
(mh() == NULL) ? "NULL" : mh()->name()->as_C_string() ));
JvmtiEnv *env = ets->get_env();
JvmtiMethodEventMark jem(thread, mh);
if (result.not_null()) {
value.l = JNIHandles::make_local(thread, result());
}
JvmtiJavaThreadEventTransition jet(thread);
jvmtiEventMethodExit callback = env->callbacks()->MethodExit;
if (callback != NULL) {
(*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(),
jem.jni_methodID(), exception_exit, value);
}
}
}
}
if (state->is_enabled(JVMTI_EVENT_FRAME_POP)) {
JvmtiEnvThreadStateIterator it(state);
for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) {
int cur_frame_number = state->cur_stack_depth();
if (ets->is_frame_pop(cur_frame_number)) {
// we have a NotifyFramePop entry for this frame.
// now check that this env/thread wants this event
if (ets->is_enabled(JVMTI_EVENT_FRAME_POP)) {
EVT_TRACE(JVMTI_EVENT_FRAME_POP, ("JVMTI [%s] Evt Frame Pop sent %s.%s",
JvmtiTrace::safe_get_thread_name(thread),
(mh() == NULL) ? "NULL" : mh()->klass_name()->as_C_string(),
(mh() == NULL) ? "NULL" : mh()->name()->as_C_string() ));
// we also need to issue a frame pop event for this frame
JvmtiEnv *env = ets->get_env();
JvmtiMethodEventMark jem(thread, mh);
JvmtiJavaThreadEventTransition jet(thread);
jvmtiEventFramePop callback = env->callbacks()->FramePop;
if (callback != NULL) {
(*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(),
jem.jni_methodID(), exception_exit);
}
}
// remove the frame's entry
ets->clear_frame_pop(cur_frame_number);
}
}
}
state->decr_cur_stack_depth();
}
// Todo: inline this for optimization
void JvmtiExport::post_single_step(JavaThread *thread, Method* method, address location) {
HandleMark hm(thread);
methodHandle mh(thread, method);
JvmtiThreadState *state = thread->jvmti_thread_state();
if (state == NULL) {
return;
}
JvmtiEnvThreadStateIterator it(state);
for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) {
ets->compare_and_set_current_location(mh(), location, JVMTI_EVENT_SINGLE_STEP);
if (!ets->single_stepping_posted() && ets->is_enabled(JVMTI_EVENT_SINGLE_STEP)) {
EVT_TRACE(JVMTI_EVENT_SINGLE_STEP, ("JVMTI [%s] Evt Single Step sent %s.%s @ %d",
JvmtiTrace::safe_get_thread_name(thread),
(mh() == NULL) ? "NULL" : mh()->klass_name()->as_C_string(),
(mh() == NULL) ? "NULL" : mh()->name()->as_C_string(),
location - mh()->code_base() ));
JvmtiEnv *env = ets->get_env();
JvmtiLocationEventMark jem(thread, mh, location);
JvmtiJavaThreadEventTransition jet(thread);
jvmtiEventSingleStep callback = env->callbacks()->SingleStep;
if (callback != NULL) {
(*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(),
jem.jni_methodID(), jem.location());
}
ets->set_single_stepping_posted();
}
}
}
void JvmtiExport::post_exception_throw(JavaThread *thread, Method* method, address location, oop exception) {
HandleMark hm(thread);
methodHandle mh(thread, method);
Handle exception_handle(thread, exception);
JvmtiThreadState *state = thread->jvmti_thread_state();
if (state == NULL) {
return;
}
EVT_TRIG_TRACE(JVMTI_EVENT_EXCEPTION, ("JVMTI [%s] Trg Exception thrown triggered",
JvmtiTrace::safe_get_thread_name(thread)));
if (!state->is_exception_detected()) {
state->set_exception_detected();
JvmtiEnvThreadStateIterator it(state);
for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) {
if (ets->is_enabled(JVMTI_EVENT_EXCEPTION) && (exception != NULL)) {
EVT_TRACE(JVMTI_EVENT_EXCEPTION,
("JVMTI [%s] Evt Exception thrown sent %s.%s @ %d",
JvmtiTrace::safe_get_thread_name(thread),
(mh() == NULL) ? "NULL" : mh()->klass_name()->as_C_string(),
(mh() == NULL) ? "NULL" : mh()->name()->as_C_string(),
location - mh()->code_base() ));
JvmtiEnv *env = ets->get_env();
JvmtiExceptionEventMark jem(thread, mh, location, exception_handle);
// It's okay to clear these exceptions here because we duplicate
// this lookup in InterpreterRuntime::exception_handler_for_exception.
EXCEPTION_MARK;
bool should_repeat;
vframeStream st(thread);
assert(!st.at_end(), "cannot be at end");
Method* current_method = NULL;
// A GC may occur during the Method::fast_exception_handler_bci_for()
// call below if it needs to load the constraint class. Using a
// methodHandle to keep the 'current_method' from being deallocated
// if GC happens.
methodHandle current_mh = methodHandle(thread, current_method);
int current_bci = -1;
do {
current_method = st.method();
current_mh = methodHandle(thread, current_method);
current_bci = st.bci();
do {
should_repeat = false;
KlassHandle eh_klass(thread, exception_handle()->klass());
current_bci = Method::fast_exception_handler_bci_for(
current_mh, eh_klass, current_bci, THREAD);
if (HAS_PENDING_EXCEPTION) {
exception_handle = Handle(thread, PENDING_EXCEPTION);
CLEAR_PENDING_EXCEPTION;
should_repeat = true;
}
} while (should_repeat && (current_bci != -1));
st.next();
} while ((current_bci < 0) && (!st.at_end()));
jmethodID catch_jmethodID;
if (current_bci < 0) {
catch_jmethodID = 0;
current_bci = 0;
} else {
catch_jmethodID = jem.to_jmethodID(current_mh);
}
JvmtiJavaThreadEventTransition jet(thread);
jvmtiEventException callback = env->callbacks()->Exception;
if (callback != NULL) {
(*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(),
jem.jni_methodID(), jem.location(),
jem.exception(),
catch_jmethodID, current_bci);
}
}
}
}
// frames may get popped because of this throw, be safe - invalidate cached depth
state->invalidate_cur_stack_depth();
}
void JvmtiExport::notice_unwind_due_to_exception(JavaThread *thread, Method* method, address location, oop exception, bool in_handler_frame) {
HandleMark hm(thread);
methodHandle mh(thread, method);
Handle exception_handle(thread, exception);
JvmtiThreadState *state = thread->jvmti_thread_state();
if (state == NULL) {
return;
}
EVT_TRIG_TRACE(JVMTI_EVENT_EXCEPTION_CATCH,
("JVMTI [%s] Trg unwind_due_to_exception triggered %s.%s @ %s%d - %s",
JvmtiTrace::safe_get_thread_name(thread),
(mh() == NULL) ? "NULL" : mh()->klass_name()->as_C_string(),
(mh() == NULL) ? "NULL" : mh()->name()->as_C_string(),
location==0? "no location:" : "",
location==0? 0 : location - mh()->code_base(),
in_handler_frame? "in handler frame" : "not handler frame" ));
if (state->is_exception_detected()) {
state->invalidate_cur_stack_depth();
if (!in_handler_frame) {
// Not in exception handler.
if(state->is_interp_only_mode()) {
// method exit and frame pop events are posted only in interp mode.
// When these events are enabled code should be in running in interp mode.
JvmtiExport::post_method_exit(thread, method, thread->last_frame());
// The cached cur_stack_depth might have changed from the
// operations of frame pop or method exit. We are not 100% sure
// the cached cur_stack_depth is still valid depth so invalidate
// it.
state->invalidate_cur_stack_depth();
}
} else {
// In exception handler frame. Report exception catch.
assert(location != NULL, "must be a known location");
// Update cur_stack_depth - the frames above the current frame
// have been unwound due to this exception:
assert(!state->is_exception_caught(), "exception must not be caught yet.");
state->set_exception_caught();
JvmtiEnvThreadStateIterator it(state);
for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) {
if (ets->is_enabled(JVMTI_EVENT_EXCEPTION_CATCH) && (exception_handle() != NULL)) {
EVT_TRACE(JVMTI_EVENT_EXCEPTION_CATCH,
("JVMTI [%s] Evt ExceptionCatch sent %s.%s @ %d",
JvmtiTrace::safe_get_thread_name(thread),
(mh() == NULL) ? "NULL" : mh()->klass_name()->as_C_string(),
(mh() == NULL) ? "NULL" : mh()->name()->as_C_string(),
location - mh()->code_base() ));
JvmtiEnv *env = ets->get_env();
JvmtiExceptionEventMark jem(thread, mh, location, exception_handle);
JvmtiJavaThreadEventTransition jet(thread);
jvmtiEventExceptionCatch callback = env->callbacks()->ExceptionCatch;
if (callback != NULL) {
(*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(),
jem.jni_methodID(), jem.location(),
jem.exception());
}
}
}
}
}
}
oop JvmtiExport::jni_GetField_probe(JavaThread *thread, jobject jobj, oop obj,
Klass* klass, jfieldID fieldID, bool is_static) {
if (*((int *)get_field_access_count_addr()) > 0 && thread->has_last_Java_frame()) {
// At least one field access watch is set so we have more work
// to do. This wrapper is used by entry points that allow us
// to create handles in post_field_access_by_jni().
post_field_access_by_jni(thread, obj, klass, fieldID, is_static);
// event posting can block so refetch oop if we were passed a jobj
if (jobj != NULL) return JNIHandles::resolve_non_null(jobj);
}
return obj;
}
oop JvmtiExport::jni_GetField_probe_nh(JavaThread *thread, jobject jobj, oop obj,
Klass* klass, jfieldID fieldID, bool is_static) {
if (*((int *)get_field_access_count_addr()) > 0 && thread->has_last_Java_frame()) {
// At least one field access watch is set so we have more work
// to do. This wrapper is used by "quick" entry points that don't
// allow us to create handles in post_field_access_by_jni(). We
// override that with a ResetNoHandleMark.
ResetNoHandleMark rnhm;
post_field_access_by_jni(thread, obj, klass, fieldID, is_static);
// event posting can block so refetch oop if we were passed a jobj
if (jobj != NULL) return JNIHandles::resolve_non_null(jobj);
}
return obj;
}
void JvmtiExport::post_field_access_by_jni(JavaThread *thread, oop obj,
Klass* klass, jfieldID fieldID, bool is_static) {
// We must be called with a Java context in order to provide reasonable
// values for the klazz, method, and location fields. The callers of this
// function don't make the call unless there is a Java context.
assert(thread->has_last_Java_frame(), "must be called with a Java context");
ResourceMark rm;
fieldDescriptor fd;
// if get_field_descriptor finds fieldID to be invalid, then we just bail
bool valid_fieldID = JvmtiEnv::get_field_descriptor(klass, fieldID, &fd);
assert(valid_fieldID == true,"post_field_access_by_jni called with invalid fieldID");
if (!valid_fieldID) return;
// field accesses are not watched so bail
if (!fd.is_field_access_watched()) return;
HandleMark hm(thread);
KlassHandle h_klass(thread, klass);
Handle h_obj;
if (!is_static) {
// non-static field accessors have an object, but we need a handle
assert(obj != NULL, "non-static needs an object");
h_obj = Handle(thread, obj);
}
post_field_access(thread,
thread->last_frame().interpreter_frame_method(),
thread->last_frame().interpreter_frame_bcp(),
h_klass, h_obj, fieldID);
}
void JvmtiExport::post_field_access(JavaThread *thread, Method* method,
address location, KlassHandle field_klass, Handle object, jfieldID field) {
HandleMark hm(thread);
methodHandle mh(thread, method);
JvmtiThreadState *state = thread->jvmti_thread_state();
if (state == NULL) {
return;
}
EVT_TRIG_TRACE(JVMTI_EVENT_FIELD_ACCESS, ("JVMTI [%s] Trg Field Access event triggered",
JvmtiTrace::safe_get_thread_name(thread)));
JvmtiEnvThreadStateIterator it(state);
for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) {
if (ets->is_enabled(JVMTI_EVENT_FIELD_ACCESS)) {
EVT_TRACE(JVMTI_EVENT_FIELD_ACCESS, ("JVMTI [%s] Evt Field Access event sent %s.%s @ %d",
JvmtiTrace::safe_get_thread_name(thread),
(mh() == NULL) ? "NULL" : mh()->klass_name()->as_C_string(),
(mh() == NULL) ? "NULL" : mh()->name()->as_C_string(),
location - mh()->code_base() ));
JvmtiEnv *env = ets->get_env();
JvmtiLocationEventMark jem(thread, mh, location);
jclass field_jclass = jem.to_jclass(field_klass());
jobject field_jobject = jem.to_jobject(object());
JvmtiJavaThreadEventTransition jet(thread);
jvmtiEventFieldAccess callback = env->callbacks()->FieldAccess;
if (callback != NULL) {
(*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(),
jem.jni_methodID(), jem.location(),
field_jclass, field_jobject, field);
}
}
}
}
oop JvmtiExport::jni_SetField_probe(JavaThread *thread, jobject jobj, oop obj,
Klass* klass, jfieldID fieldID, bool is_static,
char sig_type, jvalue *value) {
if (*((int *)get_field_modification_count_addr()) > 0 && thread->has_last_Java_frame()) {
// At least one field modification watch is set so we have more work
// to do. This wrapper is used by entry points that allow us
// to create handles in post_field_modification_by_jni().
post_field_modification_by_jni(thread, obj, klass, fieldID, is_static, sig_type, value);
// event posting can block so refetch oop if we were passed a jobj
if (jobj != NULL) return JNIHandles::resolve_non_null(jobj);
}
return obj;
}
oop JvmtiExport::jni_SetField_probe_nh(JavaThread *thread, jobject jobj, oop obj,
Klass* klass, jfieldID fieldID, bool is_static,
char sig_type, jvalue *value) {
if (*((int *)get_field_modification_count_addr()) > 0 && thread->has_last_Java_frame()) {
// At least one field modification watch is set so we have more work
// to do. This wrapper is used by "quick" entry points that don't
// allow us to create handles in post_field_modification_by_jni(). We
// override that with a ResetNoHandleMark.
ResetNoHandleMark rnhm;
post_field_modification_by_jni(thread, obj, klass, fieldID, is_static, sig_type, value);
// event posting can block so refetch oop if we were passed a jobj
if (jobj != NULL) return JNIHandles::resolve_non_null(jobj);
}
return obj;
}
void JvmtiExport::post_field_modification_by_jni(JavaThread *thread, oop obj,
Klass* klass, jfieldID fieldID, bool is_static,
char sig_type, jvalue *value) {
// We must be called with a Java context in order to provide reasonable
// values for the klazz, method, and location fields. The callers of this
// function don't make the call unless there is a Java context.
assert(thread->has_last_Java_frame(), "must be called with Java context");
ResourceMark rm;
fieldDescriptor fd;
// if get_field_descriptor finds fieldID to be invalid, then we just bail
bool valid_fieldID = JvmtiEnv::get_field_descriptor(klass, fieldID, &fd);
assert(valid_fieldID == true,"post_field_modification_by_jni called with invalid fieldID");
if (!valid_fieldID) return;
// field modifications are not watched so bail
if (!fd.is_field_modification_watched()) return;
HandleMark hm(thread);
Handle h_obj;
if (!is_static) {
// non-static field accessors have an object, but we need a handle
assert(obj != NULL, "non-static needs an object");
h_obj = Handle(thread, obj);
}
KlassHandle h_klass(thread, klass);
post_field_modification(thread,
thread->last_frame().interpreter_frame_method(),
thread->last_frame().interpreter_frame_bcp(),
h_klass, h_obj, fieldID, sig_type, value);
}
void JvmtiExport::post_raw_field_modification(JavaThread *thread, Method* method,
address location, KlassHandle field_klass, Handle object, jfieldID field,
char sig_type, jvalue *value) {
if (sig_type == 'I' || sig_type == 'Z' || sig_type == 'B' || sig_type == 'C' || sig_type == 'S') {
// 'I' instructions are used for byte, char, short and int.
// determine which it really is, and convert
fieldDescriptor fd;
bool found = JvmtiEnv::get_field_descriptor(field_klass(), field, &fd);
// should be found (if not, leave as is)
if (found) {
jint ival = value->i;
// convert value from int to appropriate type
switch (fd.field_type()) {
case T_BOOLEAN:
sig_type = 'Z';
value->i = 0; // clear it
value->z = (jboolean)ival;
break;
case T_BYTE:
sig_type = 'B';
value->i = 0; // clear it
value->b = (jbyte)ival;
break;
case T_CHAR:
sig_type = 'C';
value->i = 0; // clear it
value->c = (jchar)ival;
break;
case T_SHORT:
sig_type = 'S';
value->i = 0; // clear it
value->s = (jshort)ival;
break;
case T_INT:
// nothing to do
break;
default:
// this is an integer instruction, should be one of above
ShouldNotReachHere();
break;
}
}
}
assert(sig_type != '[', "array should have sig_type == 'L'");
bool handle_created = false;
// convert oop to JNI handle.
if (sig_type == 'L') {
handle_created = true;
value->l = (jobject)JNIHandles::make_local(thread, (oop)value->l);
}
post_field_modification(thread, method, location, field_klass, object, field, sig_type, value);
// Destroy the JNI handle allocated above.
if (handle_created) {
JNIHandles::destroy_local(value->l);
}
}
void JvmtiExport::post_field_modification(JavaThread *thread, Method* method,
address location, KlassHandle field_klass, Handle object, jfieldID field,
char sig_type, jvalue *value_ptr) {
HandleMark hm(thread);
methodHandle mh(thread, method);
JvmtiThreadState *state = thread->jvmti_thread_state();
if (state == NULL) {
return;
}
EVT_TRIG_TRACE(JVMTI_EVENT_FIELD_MODIFICATION,
("JVMTI [%s] Trg Field Modification event triggered",
JvmtiTrace::safe_get_thread_name(thread)));
JvmtiEnvThreadStateIterator it(state);
for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) {
if (ets->is_enabled(JVMTI_EVENT_FIELD_MODIFICATION)) {
EVT_TRACE(JVMTI_EVENT_FIELD_MODIFICATION,
("JVMTI [%s] Evt Field Modification event sent %s.%s @ %d",
JvmtiTrace::safe_get_thread_name(thread),
(mh() == NULL) ? "NULL" : mh()->klass_name()->as_C_string(),
(mh() == NULL) ? "NULL" : mh()->name()->as_C_string(),
location - mh()->code_base() ));
JvmtiEnv *env = ets->get_env();
JvmtiLocationEventMark jem(thread, mh, location);
jclass field_jclass = jem.to_jclass(field_klass());
jobject field_jobject = jem.to_jobject(object());
JvmtiJavaThreadEventTransition jet(thread);
jvmtiEventFieldModification callback = env->callbacks()->FieldModification;
if (callback != NULL) {
(*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(),
jem.jni_methodID(), jem.location(),
field_jclass, field_jobject, field, sig_type, *value_ptr);
}
}
}
}
void JvmtiExport::post_native_method_bind(Method* method, address* function_ptr) {
JavaThread* thread = JavaThread::current();
assert(thread->thread_state() == _thread_in_vm, "must be in vm state");
HandleMark hm(thread);
methodHandle mh(thread, method);
EVT_TRIG_TRACE(JVMTI_EVENT_NATIVE_METHOD_BIND, ("JVMTI [%s] Trg Native Method Bind event triggered",
JvmtiTrace::safe_get_thread_name(thread)));
if (JvmtiEventController::is_enabled(JVMTI_EVENT_NATIVE_METHOD_BIND)) {
JvmtiEnvIterator it;
for (JvmtiEnv* env = it.first(); env != NULL; env = it.next(env)) {
if (env->is_enabled(JVMTI_EVENT_NATIVE_METHOD_BIND)) {
EVT_TRACE(JVMTI_EVENT_NATIVE_METHOD_BIND, ("JVMTI [%s] Evt Native Method Bind event sent",
JvmtiTrace::safe_get_thread_name(thread) ));
JvmtiMethodEventMark jem(thread, mh);
JvmtiJavaThreadEventTransition jet(thread);
JNIEnv* jni_env = JvmtiEnv::get_phase() == JVMTI_PHASE_PRIMORDIAL? NULL : jem.jni_env();
jvmtiEventNativeMethodBind callback = env->callbacks()->NativeMethodBind;
if (callback != NULL) {
(*callback)(env->jvmti_external(), jni_env, jem.jni_thread(),
jem.jni_methodID(), (void*)(*function_ptr), (void**)function_ptr);
}
}
}
}
}
// Returns a record containing inlining information for the given nmethod
jvmtiCompiledMethodLoadInlineRecord* create_inline_record(nmethod* nm) {
jint numstackframes = 0;
jvmtiCompiledMethodLoadInlineRecord* record = (jvmtiCompiledMethodLoadInlineRecord*)NEW_RESOURCE_OBJ(jvmtiCompiledMethodLoadInlineRecord);
record->header.kind = JVMTI_CMLR_INLINE_INFO;
record->header.next = NULL;
record->header.majorinfoversion = JVMTI_CMLR_MAJOR_VERSION_1;
record->header.minorinfoversion = JVMTI_CMLR_MINOR_VERSION_0;
record->numpcs = 0;
for(PcDesc* p = nm->scopes_pcs_begin(); p < nm->scopes_pcs_end(); p++) {
if(p->scope_decode_offset() == DebugInformationRecorder::serialized_null) continue;
record->numpcs++;
}
record->pcinfo = (PCStackInfo*)(NEW_RESOURCE_ARRAY(PCStackInfo, record->numpcs));
int scope = 0;
for(PcDesc* p = nm->scopes_pcs_begin(); p < nm->scopes_pcs_end(); p++) {
if(p->scope_decode_offset() == DebugInformationRecorder::serialized_null) continue;
void* pc_address = (void*)p->real_pc(nm);
assert(pc_address != NULL, "pc_address must be non-null");
record->pcinfo[scope].pc = pc_address;
numstackframes=0;
for(ScopeDesc* sd = nm->scope_desc_at(p->real_pc(nm));sd != NULL;sd = sd->sender()) {
numstackframes++;
}
assert(numstackframes != 0, "numstackframes must be nonzero.");
record->pcinfo[scope].methods = (jmethodID *)NEW_RESOURCE_ARRAY(jmethodID, numstackframes);
record->pcinfo[scope].bcis = (jint *)NEW_RESOURCE_ARRAY(jint, numstackframes);
record->pcinfo[scope].numstackframes = numstackframes;
int stackframe = 0;
for(ScopeDesc* sd = nm->scope_desc_at(p->real_pc(nm));sd != NULL;sd = sd->sender()) {
// sd->method() can be NULL for stubs but not for nmethods. To be completely robust, include an assert that we should never see a null sd->method()
assert(sd->method() != NULL, "sd->method() cannot be null.");
record->pcinfo[scope].methods[stackframe] = sd->method()->jmethod_id();
record->pcinfo[scope].bcis[stackframe] = sd->bci();
stackframe++;
}
scope++;
}
return record;
}
void JvmtiExport::post_compiled_method_load(nmethod *nm) {
JavaThread* thread = JavaThread::current();
EVT_TRIG_TRACE(JVMTI_EVENT_COMPILED_METHOD_LOAD,
("JVMTI [%s] method compile load event triggered",
JvmtiTrace::safe_get_thread_name(thread)));
JvmtiEnvIterator it;
for (JvmtiEnv* env = it.first(); env != NULL; env = it.next(env)) {
if (env->is_enabled(JVMTI_EVENT_COMPILED_METHOD_LOAD)) {
EVT_TRACE(JVMTI_EVENT_COMPILED_METHOD_LOAD,
("JVMTI [%s] class compile method load event sent %s.%s ",
JvmtiTrace::safe_get_thread_name(thread),
(nm->method() == NULL) ? "NULL" : nm->method()->klass_name()->as_C_string(),
(nm->method() == NULL) ? "NULL" : nm->method()->name()->as_C_string()));
ResourceMark rm(thread);
HandleMark hm(thread);
// Add inlining information
jvmtiCompiledMethodLoadInlineRecord* inlinerecord = create_inline_record(nm);
// Pass inlining information through the void pointer
JvmtiCompiledMethodLoadEventMark jem(thread, nm, inlinerecord);
JvmtiJavaThreadEventTransition jet(thread);
jvmtiEventCompiledMethodLoad callback = env->callbacks()->CompiledMethodLoad;
if (callback != NULL) {
(*callback)(env->jvmti_external(), jem.jni_methodID(),
jem.code_size(), jem.code_data(), jem.map_length(),
jem.map(), jem.compile_info());
}
}
}
}
// post a COMPILED_METHOD_LOAD event for a given environment
void JvmtiExport::post_compiled_method_load(JvmtiEnv* env, const jmethodID method, const jint length,
const void *code_begin, const jint map_length,
const jvmtiAddrLocationMap* map)
{
JavaThread* thread = JavaThread::current();
EVT_TRIG_TRACE(JVMTI_EVENT_COMPILED_METHOD_LOAD,
("JVMTI [%s] method compile load event triggered (by GenerateEvents)",
JvmtiTrace::safe_get_thread_name(thread)));
if (env->is_enabled(JVMTI_EVENT_COMPILED_METHOD_LOAD)) {
EVT_TRACE(JVMTI_EVENT_COMPILED_METHOD_LOAD,
("JVMTI [%s] class compile method load event sent (by GenerateEvents), jmethodID=" PTR_FORMAT,
JvmtiTrace::safe_get_thread_name(thread), method));
JvmtiEventMark jem(thread);
JvmtiJavaThreadEventTransition jet(thread);
jvmtiEventCompiledMethodLoad callback = env->callbacks()->CompiledMethodLoad;
if (callback != NULL) {
(*callback)(env->jvmti_external(), method,
length, code_begin, map_length,
map, NULL);
}
}
}
void JvmtiExport::post_dynamic_code_generated_internal(const char *name, const void *code_begin, const void *code_end) {
assert(name != NULL && name[0] != '\0', "sanity check");
JavaThread* thread = JavaThread::current();
// In theory everyone coming thru here is in_vm but we need to be certain
// because a callee will do a vm->native transition
ThreadInVMfromUnknown __tiv;
EVT_TRIG_TRACE(JVMTI_EVENT_DYNAMIC_CODE_GENERATED,
("JVMTI [%s] method dynamic code generated event triggered",
JvmtiTrace::safe_get_thread_name(thread)));
JvmtiEnvIterator it;
for (JvmtiEnv* env = it.first(); env != NULL; env = it.next(env)) {
if (env->is_enabled(JVMTI_EVENT_DYNAMIC_CODE_GENERATED)) {
EVT_TRACE(JVMTI_EVENT_DYNAMIC_CODE_GENERATED,
("JVMTI [%s] dynamic code generated event sent for %s",
JvmtiTrace::safe_get_thread_name(thread), name));
JvmtiEventMark jem(thread);
JvmtiJavaThreadEventTransition jet(thread);
jint length = (jint)pointer_delta(code_end, code_begin, sizeof(char));
jvmtiEventDynamicCodeGenerated callback = env->callbacks()->DynamicCodeGenerated;
if (callback != NULL) {
(*callback)(env->jvmti_external(), name, (void*)code_begin, length);
}
}
}
}
void JvmtiExport::post_dynamic_code_generated(const char *name, const void *code_begin, const void *code_end) {
jvmtiPhase phase = JvmtiEnv::get_phase();
if (phase == JVMTI_PHASE_PRIMORDIAL || phase == JVMTI_PHASE_START) {
post_dynamic_code_generated_internal(name, code_begin, code_end);
} else {
// It may not be safe to post the event from this thread. Defer all
// postings to the service thread so that it can perform them in a safe
// context and in-order.
MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag);
JvmtiDeferredEvent event = JvmtiDeferredEvent::dynamic_code_generated_event(
name, code_begin, code_end);
JvmtiDeferredEventQueue::enqueue(event);
}
}
// post a DYNAMIC_CODE_GENERATED event for a given environment
// used by GenerateEvents
void JvmtiExport::post_dynamic_code_generated(JvmtiEnv* env, const char *name,
const void *code_begin, const void *code_end)
{
JavaThread* thread = JavaThread::current();
EVT_TRIG_TRACE(JVMTI_EVENT_DYNAMIC_CODE_GENERATED,
("JVMTI [%s] dynamic code generated event triggered (by GenerateEvents)",
JvmtiTrace::safe_get_thread_name(thread)));
if (env->is_enabled(JVMTI_EVENT_DYNAMIC_CODE_GENERATED)) {
EVT_TRACE(JVMTI_EVENT_DYNAMIC_CODE_GENERATED,
("JVMTI [%s] dynamic code generated event sent for %s",
JvmtiTrace::safe_get_thread_name(thread), name));
JvmtiEventMark jem(thread);
JvmtiJavaThreadEventTransition jet(thread);
jint length = (jint)pointer_delta(code_end, code_begin, sizeof(char));
jvmtiEventDynamicCodeGenerated callback = env->callbacks()->DynamicCodeGenerated;
if (callback != NULL) {
(*callback)(env->jvmti_external(), name, (void*)code_begin, length);
}
}
}
// post a DynamicCodeGenerated event while holding locks in the VM.
void JvmtiExport::post_dynamic_code_generated_while_holding_locks(const char* name,
address code_begin, address code_end)
{
// register the stub with the current dynamic code event collector
JvmtiThreadState* state = JvmtiThreadState::state_for(JavaThread::current());
// state can only be NULL if the current thread is exiting which
// should not happen since we're trying to post an event
guarantee(state != NULL, "attempt to register stub via an exiting thread");
JvmtiDynamicCodeEventCollector* collector = state->get_dynamic_code_event_collector();
guarantee(collector != NULL, "attempt to register stub without event collector");
collector->register_stub(name, code_begin, code_end);
}
// Collect all the vm internally allocated objects which are visible to java world
void JvmtiExport::record_vm_internal_object_allocation(oop obj) {
Thread* thread = ThreadLocalStorage::thread();
if (thread != NULL && thread->is_Java_thread()) {
// Can not take safepoint here.
No_Safepoint_Verifier no_sfpt;
// Can not take safepoint here so can not use state_for to get
// jvmti thread state.
JvmtiThreadState *state = ((JavaThread*)thread)->jvmti_thread_state();
if (state != NULL ) {
// state is non NULL when VMObjectAllocEventCollector is enabled.
JvmtiVMObjectAllocEventCollector *collector;
collector = state->get_vm_object_alloc_event_collector();
if (collector != NULL && collector->is_enabled()) {
// Don't record classes as these will be notified via the ClassLoad
// event.
if (obj->klass() != SystemDictionary::Class_klass()) {
collector->record_allocation(obj);
}
}
}
}
}
void JvmtiExport::post_garbage_collection_finish() {
Thread *thread = Thread::current(); // this event is posted from VM-Thread.
EVT_TRIG_TRACE(JVMTI_EVENT_GARBAGE_COLLECTION_FINISH,
("JVMTI [%s] garbage collection finish event triggered",
JvmtiTrace::safe_get_thread_name(thread)));
JvmtiEnvIterator it;
for (JvmtiEnv* env = it.first(); env != NULL; env = it.next(env)) {
if (env->is_enabled(JVMTI_EVENT_GARBAGE_COLLECTION_FINISH)) {
EVT_TRACE(JVMTI_EVENT_GARBAGE_COLLECTION_FINISH,
("JVMTI [%s] garbage collection finish event sent ",
JvmtiTrace::safe_get_thread_name(thread)));
JvmtiThreadEventTransition jet(thread);
// JNIEnv is NULL here because this event is posted from VM Thread
jvmtiEventGarbageCollectionFinish callback = env->callbacks()->GarbageCollectionFinish;
if (callback != NULL) {
(*callback)(env->jvmti_external());
}
}
}
}
void JvmtiExport::post_garbage_collection_start() {
Thread* thread = Thread::current(); // this event is posted from vm-thread.
EVT_TRIG_TRACE(JVMTI_EVENT_GARBAGE_COLLECTION_START,
("JVMTI [%s] garbage collection start event triggered",
JvmtiTrace::safe_get_thread_name(thread)));
JvmtiEnvIterator it;
for (JvmtiEnv* env = it.first(); env != NULL; env = it.next(env)) {
if (env->is_enabled(JVMTI_EVENT_GARBAGE_COLLECTION_START)) {
EVT_TRACE(JVMTI_EVENT_GARBAGE_COLLECTION_START,
("JVMTI [%s] garbage collection start event sent ",
JvmtiTrace::safe_get_thread_name(thread)));
JvmtiThreadEventTransition jet(thread);
// JNIEnv is NULL here because this event is posted from VM Thread
jvmtiEventGarbageCollectionStart callback = env->callbacks()->GarbageCollectionStart;
if (callback != NULL) {
(*callback)(env->jvmti_external());
}
}
}
}
void JvmtiExport::post_data_dump() {
Thread *thread = Thread::current();
EVT_TRIG_TRACE(JVMTI_EVENT_DATA_DUMP_REQUEST,
("JVMTI [%s] data dump request event triggered",
JvmtiTrace::safe_get_thread_name(thread)));
JvmtiEnvIterator it;
for (JvmtiEnv* env = it.first(); env != NULL; env = it.next(env)) {
if (env->is_enabled(JVMTI_EVENT_DATA_DUMP_REQUEST)) {
EVT_TRACE(JVMTI_EVENT_DATA_DUMP_REQUEST,
("JVMTI [%s] data dump request event sent ",
JvmtiTrace::safe_get_thread_name(thread)));
JvmtiThreadEventTransition jet(thread);
// JNIEnv is NULL here because this event is posted from VM Thread
jvmtiEventDataDumpRequest callback = env->callbacks()->DataDumpRequest;
if (callback != NULL) {
(*callback)(env->jvmti_external());
}
}
}
}
void JvmtiExport::post_monitor_contended_enter(JavaThread *thread, ObjectMonitor *obj_mntr) {
oop object = (oop)obj_mntr->object();
if (!ServiceUtil::visible_oop(object)) {
// Ignore monitor contended enter for vm internal object.
return;
}
JvmtiThreadState *state = thread->jvmti_thread_state();
if (state == NULL) {
return;
}
HandleMark hm(thread);
Handle h(thread, object);
EVT_TRIG_TRACE(JVMTI_EVENT_MONITOR_CONTENDED_ENTER,
("JVMTI [%s] montior contended enter event triggered",
JvmtiTrace::safe_get_thread_name(thread)));
JvmtiEnvThreadStateIterator it(state);
for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) {
if (ets->is_enabled(JVMTI_EVENT_MONITOR_CONTENDED_ENTER)) {
EVT_TRACE(JVMTI_EVENT_MONITOR_CONTENDED_ENTER,
("JVMTI [%s] monitor contended enter event sent",
JvmtiTrace::safe_get_thread_name(thread)));
JvmtiMonitorEventMark jem(thread, h());
JvmtiEnv *env = ets->get_env();
JvmtiThreadEventTransition jet(thread);
jvmtiEventMonitorContendedEnter callback = env->callbacks()->MonitorContendedEnter;
if (callback != NULL) {
(*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(), jem.jni_object());
}
}
}
}
void JvmtiExport::post_monitor_contended_entered(JavaThread *thread, ObjectMonitor *obj_mntr) {
oop object = (oop)obj_mntr->object();
if (!ServiceUtil::visible_oop(object)) {
// Ignore monitor contended entered for vm internal object.
return;
}
JvmtiThreadState *state = thread->jvmti_thread_state();
if (state == NULL) {
return;
}
HandleMark hm(thread);
Handle h(thread, object);
EVT_TRIG_TRACE(JVMTI_EVENT_MONITOR_CONTENDED_ENTERED,
("JVMTI [%s] montior contended entered event triggered",
JvmtiTrace::safe_get_thread_name(thread)));
JvmtiEnvThreadStateIterator it(state);
for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) {
if (ets->is_enabled(JVMTI_EVENT_MONITOR_CONTENDED_ENTERED)) {
EVT_TRACE(JVMTI_EVENT_MONITOR_CONTENDED_ENTERED,
("JVMTI [%s] monitor contended enter event sent",
JvmtiTrace::safe_get_thread_name(thread)));
JvmtiMonitorEventMark jem(thread, h());
JvmtiEnv *env = ets->get_env();
JvmtiThreadEventTransition jet(thread);
jvmtiEventMonitorContendedEntered callback = env->callbacks()->MonitorContendedEntered;
if (callback != NULL) {
(*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(), jem.jni_object());
}
}
}
}
void JvmtiExport::post_monitor_wait(JavaThread *thread, oop object,
jlong timeout) {
JvmtiThreadState *state = thread->jvmti_thread_state();
if (state == NULL) {
return;
}
HandleMark hm(thread);
Handle h(thread, object);
EVT_TRIG_TRACE(JVMTI_EVENT_MONITOR_WAIT,
("JVMTI [%s] montior wait event triggered",
JvmtiTrace::safe_get_thread_name(thread)));
JvmtiEnvThreadStateIterator it(state);
for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) {
if (ets->is_enabled(JVMTI_EVENT_MONITOR_WAIT)) {
EVT_TRACE(JVMTI_EVENT_MONITOR_WAIT,
("JVMTI [%s] monitor wait event sent ",
JvmtiTrace::safe_get_thread_name(thread)));
JvmtiMonitorEventMark jem(thread, h());
JvmtiEnv *env = ets->get_env();
JvmtiThreadEventTransition jet(thread);
jvmtiEventMonitorWait callback = env->callbacks()->MonitorWait;
if (callback != NULL) {
(*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(),
jem.jni_object(), timeout);
}
}
}
}
void JvmtiExport::post_monitor_waited(JavaThread *thread, ObjectMonitor *obj_mntr, jboolean timed_out) {
oop object = (oop)obj_mntr->object();
if (!ServiceUtil::visible_oop(object)) {
// Ignore monitor waited for vm internal object.
return;
}
JvmtiThreadState *state = thread->jvmti_thread_state();
if (state == NULL) {
return;
}
HandleMark hm(thread);
Handle h(thread, object);
EVT_TRIG_TRACE(JVMTI_EVENT_MONITOR_WAITED,
("JVMTI [%s] montior waited event triggered",
JvmtiTrace::safe_get_thread_name(thread)));
JvmtiEnvThreadStateIterator it(state);
for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) {
if (ets->is_enabled(JVMTI_EVENT_MONITOR_WAITED)) {
EVT_TRACE(JVMTI_EVENT_MONITOR_WAITED,
("JVMTI [%s] monitor waited event sent ",
JvmtiTrace::safe_get_thread_name(thread)));
JvmtiMonitorEventMark jem(thread, h());
JvmtiEnv *env = ets->get_env();
JvmtiThreadEventTransition jet(thread);
jvmtiEventMonitorWaited callback = env->callbacks()->MonitorWaited;
if (callback != NULL) {
(*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(),
jem.jni_object(), timed_out);
}
}
}
}
void JvmtiExport::post_vm_object_alloc(JavaThread *thread, oop object) {
EVT_TRIG_TRACE(JVMTI_EVENT_VM_OBJECT_ALLOC, ("JVMTI [%s] Trg vm object alloc triggered",
JvmtiTrace::safe_get_thread_name(thread)));
if (object == NULL) {
return;
}
HandleMark hm(thread);
Handle h(thread, object);
JvmtiEnvIterator it;
for (JvmtiEnv* env = it.first(); env != NULL; env = it.next(env)) {
if (env->is_enabled(JVMTI_EVENT_VM_OBJECT_ALLOC)) {
EVT_TRACE(JVMTI_EVENT_VM_OBJECT_ALLOC, ("JVMTI [%s] Evt vmobject alloc sent %s",
JvmtiTrace::safe_get_thread_name(thread),
object==NULL? "NULL" : java_lang_Class::as_Klass(object)->external_name()));
JvmtiVMObjectAllocEventMark jem(thread, h());
JvmtiJavaThreadEventTransition jet(thread);
jvmtiEventVMObjectAlloc callback = env->callbacks()->VMObjectAlloc;
if (callback != NULL) {
(*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(),
jem.jni_jobject(), jem.jni_class(), jem.size());
}
}
}
}
////////////////////////////////////////////////////////////////////////////////////////////////
void JvmtiExport::cleanup_thread(JavaThread* thread) {
assert(JavaThread::current() == thread, "thread is not current");
MutexLocker mu(JvmtiThreadState_lock);
if (thread->jvmti_thread_state() != NULL) {
// This has to happen after the thread state is removed, which is
// why it is not in post_thread_end_event like its complement
// Maybe both these functions should be rolled into the posts?
JvmtiEventController::thread_ended(thread);
}
}
void JvmtiExport::clear_detected_exception(JavaThread* thread) {
assert(JavaThread::current() == thread, "thread is not current");
JvmtiThreadState* state = thread->jvmti_thread_state();
if (state != NULL) {
state->clear_exception_detected();
}
}
void JvmtiExport::oops_do(OopClosure* f) {
JvmtiCurrentBreakpoints::oops_do(f);
JvmtiVMObjectAllocEventCollector::oops_do_for_all_threads(f);
}
void JvmtiExport::weak_oops_do(BoolObjectClosure* is_alive, OopClosure* f) {
JvmtiTagMap::weak_oops_do(is_alive, f);
}
void JvmtiExport::gc_epilogue() {
JvmtiCurrentBreakpoints::gc_epilogue();
}
// Onload raw monitor transition.
void JvmtiExport::transition_pending_onload_raw_monitors() {
JvmtiPendingMonitors::transition_raw_monitors();
}
////////////////////////////////////////////////////////////////////////////////////////////////
// type for the Agent_OnAttach entry point
extern "C" {
typedef jint (JNICALL *OnAttachEntry_t)(JavaVM*, char *, void *);
}
jint JvmtiExport::load_agent_library(AttachOperation* op, outputStream* st) {
char ebuf[1024];
char buffer[JVM_MAXPATHLEN];
void* library = NULL;
jint result = JNI_ERR;
const char *on_attach_symbols[] = AGENT_ONATTACH_SYMBOLS;
size_t num_symbol_entries = ARRAY_SIZE(on_attach_symbols);
// get agent name and options
const char* agent = op->arg(0);
const char* absParam = op->arg(1);
const char* options = op->arg(2);
// The abs paramter should be "true" or "false"
bool is_absolute_path = (absParam != NULL) && (strcmp(absParam,"true")==0);
// Initially marked as invalid. It will be set to valid if we can find the agent
AgentLibrary *agent_lib = new AgentLibrary(agent, options, is_absolute_path, NULL);
// Check for statically linked in agent. If not found then if the path is
// absolute we attempt to load the library. Otherwise we try to load it
// from the standard dll directory.
if (!os::find_builtin_agent(agent_lib, on_attach_symbols, num_symbol_entries)) {
if (is_absolute_path) {
library = os::dll_load(agent, ebuf, sizeof ebuf);
} else {
// Try to load the agent from the standard dll directory
if (os::dll_build_name(buffer, sizeof(buffer), Arguments::get_dll_dir(),
agent)) {
library = os::dll_load(buffer, ebuf, sizeof ebuf);
}
if (library == NULL) {
// not found - try local path
char ns[1] = {0};
if (os::dll_build_name(buffer, sizeof(buffer), ns, agent)) {
library = os::dll_load(buffer, ebuf, sizeof ebuf);
}
}
}
if (library != NULL) {
agent_lib->set_os_lib(library);
agent_lib->set_valid();
}
}
// If the library was loaded then we attempt to invoke the Agent_OnAttach
// function
if (agent_lib->valid()) {
// Lookup the Agent_OnAttach function
OnAttachEntry_t on_attach_entry = NULL;
on_attach_entry = CAST_TO_FN_PTR(OnAttachEntry_t,
os::find_agent_function(agent_lib, false, on_attach_symbols, num_symbol_entries));
if (on_attach_entry == NULL) {
// Agent_OnAttach missing - unload library
if (!agent_lib->is_static_lib()) {
os::dll_unload(library);
}
delete agent_lib;
} else {
// Invoke the Agent_OnAttach function
JavaThread* THREAD = JavaThread::current();
{
extern struct JavaVM_ main_vm;
JvmtiThreadEventMark jem(THREAD);
JvmtiJavaThreadEventTransition jet(THREAD);
result = (*on_attach_entry)(&main_vm, (char*)options, NULL);
}
// Agent_OnAttach may have used JNI
if (HAS_PENDING_EXCEPTION) {
CLEAR_PENDING_EXCEPTION;
}
// If OnAttach returns JNI_OK then we add it to the list of
// agent libraries so that we can call Agent_OnUnload later.
if (result == JNI_OK) {
Arguments::add_loaded_agent(agent_lib);
} else {
delete agent_lib;
}
// Agent_OnAttach executed so completion status is JNI_OK
st->print_cr("%d", result);
result = JNI_OK;
}
}
return result;
}
////////////////////////////////////////////////////////////////////////////////////////////////
// Setup current current thread for event collection.
void JvmtiEventCollector::setup_jvmti_thread_state() {
// set this event collector to be the current one.
JvmtiThreadState* state = JvmtiThreadState::state_for(JavaThread::current());
// state can only be NULL if the current thread is exiting which
// should not happen since we're trying to configure for event collection
guarantee(state != NULL, "exiting thread called setup_jvmti_thread_state");
if (is_vm_object_alloc_event()) {
_prev = state->get_vm_object_alloc_event_collector();
state->set_vm_object_alloc_event_collector((JvmtiVMObjectAllocEventCollector *)this);
} else if (is_dynamic_code_event()) {
_prev = state->get_dynamic_code_event_collector();
state->set_dynamic_code_event_collector((JvmtiDynamicCodeEventCollector *)this);
}
}
// Unset current event collection in this thread and reset it with previous
// collector.
void JvmtiEventCollector::unset_jvmti_thread_state() {
JvmtiThreadState* state = JavaThread::current()->jvmti_thread_state();
if (state != NULL) {
// restore the previous event collector (if any)
if (is_vm_object_alloc_event()) {
if (state->get_vm_object_alloc_event_collector() == this) {
state->set_vm_object_alloc_event_collector((JvmtiVMObjectAllocEventCollector *)_prev);
} else {
// this thread's jvmti state was created during the scope of
// the event collector.
}
} else {
if (is_dynamic_code_event()) {
if (state->get_dynamic_code_event_collector() == this) {
state->set_dynamic_code_event_collector((JvmtiDynamicCodeEventCollector *)_prev);
} else {
// this thread's jvmti state was created during the scope of
// the event collector.
}
}
}
}
}
// create the dynamic code event collector
JvmtiDynamicCodeEventCollector::JvmtiDynamicCodeEventCollector() : _code_blobs(NULL) {
if (JvmtiExport::should_post_dynamic_code_generated()) {
setup_jvmti_thread_state();
}
}
// iterate over any code blob descriptors collected and post a
// DYNAMIC_CODE_GENERATED event to the profiler.
JvmtiDynamicCodeEventCollector::~JvmtiDynamicCodeEventCollector() {
assert(!JavaThread::current()->owns_locks(), "all locks must be released to post deferred events");
// iterate over any code blob descriptors that we collected
if (_code_blobs != NULL) {
for (int i=0; i<_code_blobs->length(); i++) {
JvmtiCodeBlobDesc* blob = _code_blobs->at(i);
JvmtiExport::post_dynamic_code_generated(blob->name(), blob->code_begin(), blob->code_end());
FreeHeap(blob);
}
delete _code_blobs;
}
unset_jvmti_thread_state();
}
// register a stub
void JvmtiDynamicCodeEventCollector::register_stub(const char* name, address start, address end) {
if (_code_blobs == NULL) {
_code_blobs = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<JvmtiCodeBlobDesc*>(1,true);
}
_code_blobs->append(new JvmtiCodeBlobDesc(name, start, end));
}
// Setup current thread to record vm allocated objects.
JvmtiVMObjectAllocEventCollector::JvmtiVMObjectAllocEventCollector() : _allocated(NULL) {
if (JvmtiExport::should_post_vm_object_alloc()) {
_enable = true;
setup_jvmti_thread_state();
} else {
_enable = false;
}
}
// Post vm_object_alloc event for vm allocated objects visible to java
// world.
JvmtiVMObjectAllocEventCollector::~JvmtiVMObjectAllocEventCollector() {
if (_allocated != NULL) {
set_enabled(false);
for (int i = 0; i < _allocated->length(); i++) {
oop obj = _allocated->at(i);
if (ServiceUtil::visible_oop(obj)) {
JvmtiExport::post_vm_object_alloc(JavaThread::current(), obj);
}
}
delete _allocated;
}
unset_jvmti_thread_state();
}
void JvmtiVMObjectAllocEventCollector::record_allocation(oop obj) {
assert(is_enabled(), "VM object alloc event collector is not enabled");
if (_allocated == NULL) {
_allocated = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<oop>(1, true);
}
_allocated->push(obj);
}
// GC support.
void JvmtiVMObjectAllocEventCollector::oops_do(OopClosure* f) {
if (_allocated != NULL) {
for(int i=_allocated->length() - 1; i >= 0; i--) {
if (_allocated->at(i) != NULL) {
f->do_oop(_allocated->adr_at(i));
}
}
}
}
void JvmtiVMObjectAllocEventCollector::oops_do_for_all_threads(OopClosure* f) {
// no-op if jvmti not enabled
if (!JvmtiEnv::environments_might_exist()) {
return;
}
// Runs at safepoint. So no need to acquire Threads_lock.
for (JavaThread *jthr = Threads::first(); jthr != NULL; jthr = jthr->next()) {
JvmtiThreadState *state = jthr->jvmti_thread_state();
if (state != NULL) {
JvmtiVMObjectAllocEventCollector *collector;
collector = state->get_vm_object_alloc_event_collector();
while (collector != NULL) {
collector->oops_do(f);
collector = (JvmtiVMObjectAllocEventCollector *)collector->get_prev();
}
}
}
}
// Disable collection of VMObjectAlloc events
NoJvmtiVMObjectAllocMark::NoJvmtiVMObjectAllocMark() : _collector(NULL) {
// a no-op if VMObjectAlloc event is not enabled
if (!JvmtiExport::should_post_vm_object_alloc()) {
return;
}
Thread* thread = ThreadLocalStorage::thread();
if (thread != NULL && thread->is_Java_thread()) {
JavaThread* current_thread = (JavaThread*)thread;
JvmtiThreadState *state = current_thread->jvmti_thread_state();
if (state != NULL) {
JvmtiVMObjectAllocEventCollector *collector;
collector = state->get_vm_object_alloc_event_collector();
if (collector != NULL && collector->is_enabled()) {
_collector = collector;
_collector->set_enabled(false);
}
}
}
}
// Re-Enable collection of VMObjectAlloc events (if previously enabled)
NoJvmtiVMObjectAllocMark::~NoJvmtiVMObjectAllocMark() {
if (was_enabled()) {
_collector->set_enabled(true);
}
};
JvmtiGCMarker::JvmtiGCMarker() {
// if there aren't any JVMTI environments then nothing to do
if (!JvmtiEnv::environments_might_exist()) {
return;
}
if (JvmtiExport::should_post_garbage_collection_start()) {
JvmtiExport::post_garbage_collection_start();
}
if (SafepointSynchronize::is_at_safepoint()) {
// Do clean up tasks that need to be done at a safepoint
JvmtiEnvBase::check_for_periodic_clean_up();
}
}
JvmtiGCMarker::~JvmtiGCMarker() {
// if there aren't any JVMTI environments then nothing to do
if (!JvmtiEnv::environments_might_exist()) {
return;
}
// JVMTI notify gc finish
if (JvmtiExport::should_post_garbage_collection_finish()) {
JvmtiExport::post_garbage_collection_finish();
}
}