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/*
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* Copyright 2003-2007 Sun Microsystems, Inc. All Rights Reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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* CA 95054 USA or visit www.sun.com if you need additional information or
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* have any questions.
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*
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*/
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# include "incls/_precompiled.incl"
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# include "incls/_jvmtiEnvBase.cpp.incl"
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///////////////////////////////////////////////////////////////
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//
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// JvmtiEnvBase
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//
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JvmtiEnvBase* JvmtiEnvBase::_head_environment = NULL;
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bool JvmtiEnvBase::_globally_initialized = false;
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volatile bool JvmtiEnvBase::_needs_clean_up = false;
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jvmtiPhase JvmtiEnvBase::_phase = JVMTI_PHASE_PRIMORDIAL;
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volatile int JvmtiEnvBase::_dying_thread_env_iteration_count = 0;
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extern jvmtiInterface_1_ jvmti_Interface;
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extern jvmtiInterface_1_ jvmtiTrace_Interface;
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// perform initializations that must occur before any JVMTI environments
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// are released but which should only be initialized once (no matter
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// how many environments are created).
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void
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JvmtiEnvBase::globally_initialize() {
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assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), "sanity check");
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assert(_globally_initialized == false, "bad call");
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JvmtiManageCapabilities::initialize();
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#ifndef JVMTI_KERNEL
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// register extension functions and events
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JvmtiExtensions::register_extensions();
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#endif // !JVMTI_KERNEL
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#ifdef JVMTI_TRACE
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JvmtiTrace::initialize();
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#endif
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_globally_initialized = true;
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}
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void
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JvmtiEnvBase::initialize() {
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assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), "sanity check");
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// Add this environment to the end of the environment list (order is important)
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{
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// This block of code must not contain any safepoints, as list deallocation
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// (which occurs at a safepoint) cannot occur simultaneously with this list
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// addition. Note: No_Safepoint_Verifier cannot, currently, be used before
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// threads exist.
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JvmtiEnvIterator it;
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JvmtiEnvBase *previous_env = NULL;
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for (JvmtiEnvBase* env = it.first(); env != NULL; env = it.next(env)) {
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previous_env = env;
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}
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if (previous_env == NULL) {
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_head_environment = this;
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} else {
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previous_env->set_next_environment(this);
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}
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}
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if (_globally_initialized == false) {
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globally_initialize();
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}
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}
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JvmtiEnvBase::JvmtiEnvBase() : _env_event_enable() {
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_env_local_storage = NULL;
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_tag_map = NULL;
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_native_method_prefix_count = 0;
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_native_method_prefixes = NULL;
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_next = NULL;
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_class_file_load_hook_ever_enabled = false;
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// Moot since ClassFileLoadHook not yet enabled.
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// But "true" will give a more predictable ClassFileLoadHook behavior
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// for environment creation during ClassFileLoadHook.
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_is_retransformable = true;
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// all callbacks initially NULL
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memset(&_event_callbacks,0,sizeof(jvmtiEventCallbacks));
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// all capabilities initially off
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memset(&_current_capabilities, 0, sizeof(_current_capabilities));
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// all prohibited capabilities initially off
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memset(&_prohibited_capabilities, 0, sizeof(_prohibited_capabilities));
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_magic = JVMTI_MAGIC;
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JvmtiEventController::env_initialize((JvmtiEnv*)this);
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#ifdef JVMTI_TRACE
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_jvmti_external.functions = TraceJVMTI != NULL ? &jvmtiTrace_Interface : &jvmti_Interface;
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#else
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_jvmti_external.functions = &jvmti_Interface;
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#endif
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}
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void
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JvmtiEnvBase::dispose() {
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#ifdef JVMTI_TRACE
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JvmtiTrace::shutdown();
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#endif
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// Dispose of event info and let the event controller call us back
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// in a locked state (env_dispose, below)
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JvmtiEventController::env_dispose(this);
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}
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void
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JvmtiEnvBase::env_dispose() {
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assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), "sanity check");
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// We have been entered with all events disabled on this environment.
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// A race to re-enable events (by setting callbacks) is prevented by
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// checking for a valid environment when setting callbacks (while
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// holding the JvmtiThreadState_lock).
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// Mark as invalid.
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_magic = DISPOSED_MAGIC;
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// Relinquish all capabilities.
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jvmtiCapabilities *caps = get_capabilities();
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JvmtiManageCapabilities::relinquish_capabilities(caps, caps, caps);
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// Same situation as with events (see above)
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set_native_method_prefixes(0, NULL);
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#ifndef JVMTI_KERNEL
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JvmtiTagMap* tag_map_to_deallocate = _tag_map;
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set_tag_map(NULL);
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// A tag map can be big, deallocate it now
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if (tag_map_to_deallocate != NULL) {
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delete tag_map_to_deallocate;
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}
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#endif // !JVMTI_KERNEL
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_needs_clean_up = true;
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}
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JvmtiEnvBase::~JvmtiEnvBase() {
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assert(SafepointSynchronize::is_at_safepoint(), "sanity check");
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// There is a small window of time during which the tag map of a
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// disposed environment could have been reallocated.
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// Make sure it is gone.
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#ifndef JVMTI_KERNEL
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JvmtiTagMap* tag_map_to_deallocate = _tag_map;
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set_tag_map(NULL);
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// A tag map can be big, deallocate it now
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if (tag_map_to_deallocate != NULL) {
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delete tag_map_to_deallocate;
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}
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#endif // !JVMTI_KERNEL
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_magic = BAD_MAGIC;
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}
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void
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JvmtiEnvBase::periodic_clean_up() {
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assert(SafepointSynchronize::is_at_safepoint(), "sanity check");
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// JvmtiEnvBase reference is saved in JvmtiEnvThreadState. So
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// clean up JvmtiThreadState before deleting JvmtiEnv pointer.
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JvmtiThreadState::periodic_clean_up();
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// Unlink all invalid environments from the list of environments
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// and deallocate them
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JvmtiEnvIterator it;
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JvmtiEnvBase* previous_env = NULL;
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JvmtiEnvBase* env = it.first();
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while (env != NULL) {
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if (env->is_valid()) {
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previous_env = env;
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env = it.next(env);
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} else {
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// This one isn't valid, remove it from the list and deallocate it
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JvmtiEnvBase* defunct_env = env;
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env = it.next(env);
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if (previous_env == NULL) {
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_head_environment = env;
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} else {
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previous_env->set_next_environment(env);
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}
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delete defunct_env;
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}
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}
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}
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void
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JvmtiEnvBase::check_for_periodic_clean_up() {
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assert(SafepointSynchronize::is_at_safepoint(), "sanity check");
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class ThreadInsideIterationClosure: public ThreadClosure {
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private:
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bool _inside;
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public:
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ThreadInsideIterationClosure() : _inside(false) {};
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void do_thread(Thread* thread) {
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_inside |= thread->is_inside_jvmti_env_iteration();
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}
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bool is_inside_jvmti_env_iteration() {
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return _inside;
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}
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};
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if (_needs_clean_up) {
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// Check if we are currently iterating environment,
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// deallocation should not occur if we are
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ThreadInsideIterationClosure tiic;
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Threads::threads_do(&tiic);
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if (!tiic.is_inside_jvmti_env_iteration() &&
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!is_inside_dying_thread_env_iteration()) {
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_needs_clean_up = false;
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JvmtiEnvBase::periodic_clean_up();
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}
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}
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}
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void
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JvmtiEnvBase::record_first_time_class_file_load_hook_enabled() {
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assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(),
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"sanity check");
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if (!_class_file_load_hook_ever_enabled) {
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_class_file_load_hook_ever_enabled = true;
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if (get_capabilities()->can_retransform_classes) {
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_is_retransformable = true;
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} else {
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_is_retransformable = false;
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// cannot add retransform capability after ClassFileLoadHook has been enabled
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get_prohibited_capabilities()->can_retransform_classes = 1;
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}
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}
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}
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void
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JvmtiEnvBase::record_class_file_load_hook_enabled() {
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if (!_class_file_load_hook_ever_enabled) {
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if (Threads::number_of_threads() == 0) {
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record_first_time_class_file_load_hook_enabled();
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} else {
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MutexLocker mu(JvmtiThreadState_lock);
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record_first_time_class_file_load_hook_enabled();
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}
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}
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}
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jvmtiError
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JvmtiEnvBase::set_native_method_prefixes(jint prefix_count, char** prefixes) {
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assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(),
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"sanity check");
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int old_prefix_count = get_native_method_prefix_count();
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char **old_prefixes = get_native_method_prefixes();
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// allocate and install the new prefixex
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if (prefix_count == 0 || !is_valid()) {
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_native_method_prefix_count = 0;
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_native_method_prefixes = NULL;
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} else {
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// there are prefixes, allocate an array to hold them, and fill it
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char** new_prefixes = (char**)os::malloc((prefix_count) * sizeof(char*));
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if (new_prefixes == NULL) {
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return JVMTI_ERROR_OUT_OF_MEMORY;
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}
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for (int i = 0; i < prefix_count; i++) {
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char* prefix = prefixes[i];
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if (prefix == NULL) {
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for (int j = 0; j < (i-1); j++) {
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os::free(new_prefixes[j]);
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}
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os::free(new_prefixes);
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return JVMTI_ERROR_NULL_POINTER;
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}
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prefix = os::strdup(prefixes[i]);
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if (prefix == NULL) {
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for (int j = 0; j < (i-1); j++) {
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os::free(new_prefixes[j]);
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}
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os::free(new_prefixes);
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return JVMTI_ERROR_OUT_OF_MEMORY;
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}
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new_prefixes[i] = prefix;
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}
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_native_method_prefix_count = prefix_count;
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_native_method_prefixes = new_prefixes;
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}
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// now that we know the new prefixes have been successfully installed we can
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// safely remove the old ones
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if (old_prefix_count != 0) {
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for (int i = 0; i < old_prefix_count; i++) {
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os::free(old_prefixes[i]);
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}
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os::free(old_prefixes);
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}
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return JVMTI_ERROR_NONE;
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}
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// Collect all the prefixes which have been set in any JVM TI environments
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// by the SetNativeMethodPrefix(es) functions. Be sure to maintain the
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// order of environments and the order of prefixes within each environment.
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// Return in a resource allocated array.
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char**
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JvmtiEnvBase::get_all_native_method_prefixes(int* count_ptr) {
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assert(Threads::number_of_threads() == 0 ||
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SafepointSynchronize::is_at_safepoint() ||
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JvmtiThreadState_lock->is_locked(),
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"sanity check");
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int total_count = 0;
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GrowableArray<char*>* prefix_array =new GrowableArray<char*>(5);
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JvmtiEnvIterator it;
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for (JvmtiEnvBase* env = it.first(); env != NULL; env = it.next(env)) {
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int prefix_count = env->get_native_method_prefix_count();
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char** prefixes = env->get_native_method_prefixes();
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for (int j = 0; j < prefix_count; j++) {
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// retrieve a prefix and so that it is safe against asynchronous changes
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// copy it into the resource area
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char* prefix = prefixes[j];
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char* prefix_copy = NEW_RESOURCE_ARRAY(char, strlen(prefix)+1);
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strcpy(prefix_copy, prefix);
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prefix_array->at_put_grow(total_count++, prefix_copy);
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}
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}
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char** all_prefixes = NEW_RESOURCE_ARRAY(char*, total_count);
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char** p = all_prefixes;
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for (int i = 0; i < total_count; ++i) {
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*p++ = prefix_array->at(i);
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}
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*count_ptr = total_count;
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return all_prefixes;
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}
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void
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JvmtiEnvBase::set_event_callbacks(const jvmtiEventCallbacks* callbacks,
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jint size_of_callbacks) {
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assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), "sanity check");
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size_t byte_cnt = sizeof(jvmtiEventCallbacks);
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// clear in either case to be sure we got any gap between sizes
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memset(&_event_callbacks, 0, byte_cnt);
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// Now that JvmtiThreadState_lock is held, prevent a possible race condition where events
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// are re-enabled by a call to set event callbacks where the DisposeEnvironment
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// occurs after the boiler-plate environment check and before the lock is acquired.
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if (callbacks != NULL && is_valid()) {
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if (size_of_callbacks < (jint)byte_cnt) {
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byte_cnt = size_of_callbacks;
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}
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memcpy(&_event_callbacks, callbacks, byte_cnt);
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}
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}
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// Called from JVMTI entry points which perform stack walking. If the
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// associated JavaThread is the current thread, then wait_for_suspend
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// is not used. Otherwise, it determines if we should wait for the
|
|
408 |
// "other" thread to complete external suspension. (NOTE: in future
|
|
409 |
// releases the suspension mechanism should be reimplemented so this
|
|
410 |
// is not necessary.)
|
|
411 |
//
|
|
412 |
bool
|
|
413 |
JvmtiEnvBase::is_thread_fully_suspended(JavaThread* thr, bool wait_for_suspend, uint32_t *bits) {
|
|
414 |
// "other" threads require special handling
|
|
415 |
if (thr != JavaThread::current()) {
|
|
416 |
if (wait_for_suspend) {
|
|
417 |
// We are allowed to wait for the external suspend to complete
|
|
418 |
// so give the other thread a chance to get suspended.
|
|
419 |
if (!thr->wait_for_ext_suspend_completion(SuspendRetryCount,
|
|
420 |
SuspendRetryDelay, bits)) {
|
|
421 |
// didn't make it so let the caller know
|
|
422 |
return false;
|
|
423 |
}
|
|
424 |
}
|
|
425 |
// We aren't allowed to wait for the external suspend to complete
|
|
426 |
// so if the other thread isn't externally suspended we need to
|
|
427 |
// let the caller know.
|
|
428 |
else if (!thr->is_ext_suspend_completed_with_lock(bits)) {
|
|
429 |
return false;
|
|
430 |
}
|
|
431 |
}
|
|
432 |
|
|
433 |
return true;
|
|
434 |
}
|
|
435 |
|
|
436 |
|
|
437 |
// In the fullness of time, all users of the method should instead
|
|
438 |
// directly use allocate, besides being cleaner and faster, this will
|
|
439 |
// mean much better out of memory handling
|
|
440 |
unsigned char *
|
|
441 |
JvmtiEnvBase::jvmtiMalloc(jlong size) {
|
|
442 |
unsigned char* mem;
|
|
443 |
jvmtiError result = allocate(size, &mem);
|
|
444 |
assert(result == JVMTI_ERROR_NONE, "Allocate failed");
|
|
445 |
return mem;
|
|
446 |
}
|
|
447 |
|
|
448 |
|
|
449 |
//
|
|
450 |
// Threads
|
|
451 |
//
|
|
452 |
|
|
453 |
jobject *
|
|
454 |
JvmtiEnvBase::new_jobjectArray(int length, Handle *handles) {
|
|
455 |
if (length == 0) {
|
|
456 |
return NULL;
|
|
457 |
}
|
|
458 |
|
|
459 |
jobject *objArray = (jobject *) jvmtiMalloc(sizeof(jobject) * length);
|
|
460 |
NULL_CHECK(objArray, NULL);
|
|
461 |
|
|
462 |
for (int i=0; i<length; i++) {
|
|
463 |
objArray[i] = jni_reference(handles[i]);
|
|
464 |
}
|
|
465 |
return objArray;
|
|
466 |
}
|
|
467 |
|
|
468 |
jthread *
|
|
469 |
JvmtiEnvBase::new_jthreadArray(int length, Handle *handles) {
|
|
470 |
return (jthread *) new_jobjectArray(length,handles);
|
|
471 |
}
|
|
472 |
|
|
473 |
jthreadGroup *
|
|
474 |
JvmtiEnvBase::new_jthreadGroupArray(int length, Handle *handles) {
|
|
475 |
return (jthreadGroup *) new_jobjectArray(length,handles);
|
|
476 |
}
|
|
477 |
|
|
478 |
|
|
479 |
JavaThread *
|
|
480 |
JvmtiEnvBase::get_JavaThread(jthread jni_thread) {
|
|
481 |
oop t = JNIHandles::resolve_external_guard(jni_thread);
|
|
482 |
if (t == NULL || !t->is_a(SystemDictionary::thread_klass())) {
|
|
483 |
return NULL;
|
|
484 |
}
|
|
485 |
// The following returns NULL if the thread has not yet run or is in
|
|
486 |
// process of exiting
|
|
487 |
return java_lang_Thread::thread(t);
|
|
488 |
}
|
|
489 |
|
|
490 |
|
|
491 |
// update the access_flags for the field in the klass
|
|
492 |
void
|
|
493 |
JvmtiEnvBase::update_klass_field_access_flag(fieldDescriptor *fd) {
|
|
494 |
instanceKlass* ik = instanceKlass::cast(fd->field_holder());
|
|
495 |
typeArrayOop fields = ik->fields();
|
|
496 |
fields->ushort_at_put(fd->index(), (jushort)fd->access_flags().as_short());
|
|
497 |
}
|
|
498 |
|
|
499 |
|
|
500 |
// return the vframe on the specified thread and depth, NULL if no such frame
|
|
501 |
vframe*
|
|
502 |
JvmtiEnvBase::vframeFor(JavaThread* java_thread, jint depth) {
|
|
503 |
if (!java_thread->has_last_Java_frame()) {
|
|
504 |
return NULL;
|
|
505 |
}
|
|
506 |
RegisterMap reg_map(java_thread);
|
|
507 |
vframe *vf = java_thread->last_java_vframe(®_map);
|
|
508 |
int d = 0;
|
|
509 |
while ((vf != NULL) && (d < depth)) {
|
|
510 |
vf = vf->java_sender();
|
|
511 |
d++;
|
|
512 |
}
|
|
513 |
return vf;
|
|
514 |
}
|
|
515 |
|
|
516 |
|
|
517 |
//
|
|
518 |
// utilities: JNI objects
|
|
519 |
//
|
|
520 |
|
|
521 |
|
|
522 |
jclass
|
|
523 |
JvmtiEnvBase::get_jni_class_non_null(klassOop k) {
|
|
524 |
assert(k != NULL, "k != NULL");
|
|
525 |
return (jclass)jni_reference(Klass::cast(k)->java_mirror());
|
|
526 |
}
|
|
527 |
|
|
528 |
#ifndef JVMTI_KERNEL
|
|
529 |
|
|
530 |
//
|
|
531 |
// Field Information
|
|
532 |
//
|
|
533 |
|
|
534 |
bool
|
|
535 |
JvmtiEnvBase::get_field_descriptor(klassOop k, jfieldID field, fieldDescriptor* fd) {
|
|
536 |
if (!jfieldIDWorkaround::is_valid_jfieldID(k, field)) {
|
|
537 |
return false;
|
|
538 |
}
|
|
539 |
bool found = false;
|
|
540 |
if (jfieldIDWorkaround::is_static_jfieldID(field)) {
|
|
541 |
JNIid* id = jfieldIDWorkaround::from_static_jfieldID(field);
|
|
542 |
int offset = id->offset();
|
|
543 |
klassOop holder = id->holder();
|
|
544 |
found = instanceKlass::cast(holder)->find_local_field_from_offset(offset, true, fd);
|
|
545 |
} else {
|
|
546 |
// Non-static field. The fieldID is really the offset of the field within the object.
|
|
547 |
int offset = jfieldIDWorkaround::from_instance_jfieldID(k, field);
|
|
548 |
found = instanceKlass::cast(k)->find_field_from_offset(offset, false, fd);
|
|
549 |
}
|
|
550 |
return found;
|
|
551 |
}
|
|
552 |
|
|
553 |
//
|
|
554 |
// Object Monitor Information
|
|
555 |
//
|
|
556 |
|
|
557 |
//
|
|
558 |
// Count the number of objects for a lightweight monitor. The hobj
|
|
559 |
// parameter is object that owns the monitor so this routine will
|
|
560 |
// count the number of times the same object was locked by frames
|
|
561 |
// in java_thread.
|
|
562 |
//
|
|
563 |
jint
|
|
564 |
JvmtiEnvBase::count_locked_objects(JavaThread *java_thread, Handle hobj) {
|
|
565 |
jint ret = 0;
|
|
566 |
if (!java_thread->has_last_Java_frame()) {
|
|
567 |
return ret; // no Java frames so no monitors
|
|
568 |
}
|
|
569 |
|
|
570 |
ResourceMark rm;
|
|
571 |
HandleMark hm;
|
|
572 |
RegisterMap reg_map(java_thread);
|
|
573 |
|
|
574 |
for(javaVFrame *jvf=java_thread->last_java_vframe(®_map); jvf != NULL;
|
|
575 |
jvf = jvf->java_sender()) {
|
|
576 |
GrowableArray<MonitorInfo*>* mons = jvf->monitors();
|
|
577 |
if (!mons->is_empty()) {
|
|
578 |
for (int i = 0; i < mons->length(); i++) {
|
|
579 |
MonitorInfo *mi = mons->at(i);
|
|
580 |
|
|
581 |
// see if owner of the monitor is our object
|
|
582 |
if (mi->owner() != NULL && mi->owner() == hobj()) {
|
|
583 |
ret++;
|
|
584 |
}
|
|
585 |
}
|
|
586 |
}
|
|
587 |
}
|
|
588 |
return ret;
|
|
589 |
}
|
|
590 |
|
|
591 |
|
|
592 |
|
|
593 |
jvmtiError
|
|
594 |
JvmtiEnvBase::get_current_contended_monitor(JavaThread *calling_thread, JavaThread *java_thread, jobject *monitor_ptr) {
|
|
595 |
#ifdef ASSERT
|
|
596 |
uint32_t debug_bits = 0;
|
|
597 |
#endif
|
|
598 |
assert((SafepointSynchronize::is_at_safepoint() ||
|
|
599 |
is_thread_fully_suspended(java_thread, false, &debug_bits)),
|
|
600 |
"at safepoint or target thread is suspended");
|
|
601 |
oop obj = NULL;
|
|
602 |
ObjectMonitor *mon = java_thread->current_waiting_monitor();
|
|
603 |
if (mon == NULL) {
|
|
604 |
// thread is not doing an Object.wait() call
|
|
605 |
mon = java_thread->current_pending_monitor();
|
|
606 |
if (mon != NULL) {
|
|
607 |
// The thread is trying to enter() or raw_enter() an ObjectMonitor.
|
|
608 |
obj = (oop)mon->object();
|
|
609 |
// If obj == NULL, then ObjectMonitor is raw which doesn't count
|
|
610 |
// as contended for this API
|
|
611 |
}
|
|
612 |
// implied else: no contended ObjectMonitor
|
|
613 |
} else {
|
|
614 |
// thread is doing an Object.wait() call
|
|
615 |
obj = (oop)mon->object();
|
|
616 |
assert(obj != NULL, "Object.wait() should have an object");
|
|
617 |
}
|
|
618 |
|
|
619 |
if (obj == NULL) {
|
|
620 |
*monitor_ptr = NULL;
|
|
621 |
} else {
|
|
622 |
HandleMark hm;
|
|
623 |
Handle hobj(obj);
|
|
624 |
*monitor_ptr = jni_reference(calling_thread, hobj);
|
|
625 |
}
|
|
626 |
return JVMTI_ERROR_NONE;
|
|
627 |
}
|
|
628 |
|
|
629 |
|
|
630 |
jvmtiError
|
|
631 |
JvmtiEnvBase::get_owned_monitors(JavaThread *calling_thread, JavaThread* java_thread,
|
|
632 |
GrowableArray<jvmtiMonitorStackDepthInfo*> *owned_monitors_list) {
|
|
633 |
jvmtiError err = JVMTI_ERROR_NONE;
|
|
634 |
#ifdef ASSERT
|
|
635 |
uint32_t debug_bits = 0;
|
|
636 |
#endif
|
|
637 |
assert((SafepointSynchronize::is_at_safepoint() ||
|
|
638 |
is_thread_fully_suspended(java_thread, false, &debug_bits)),
|
|
639 |
"at safepoint or target thread is suspended");
|
|
640 |
|
|
641 |
if (java_thread->has_last_Java_frame()) {
|
|
642 |
ResourceMark rm;
|
|
643 |
HandleMark hm;
|
|
644 |
RegisterMap reg_map(java_thread);
|
|
645 |
|
|
646 |
int depth = 0;
|
|
647 |
for (javaVFrame *jvf = java_thread->last_java_vframe(®_map); jvf != NULL;
|
|
648 |
jvf = jvf->java_sender()) {
|
|
649 |
if (depth++ < MaxJavaStackTraceDepth) { // check for stack too deep
|
|
650 |
// add locked objects for this frame into list
|
|
651 |
err = get_locked_objects_in_frame(calling_thread, java_thread, jvf, owned_monitors_list, depth-1);
|
|
652 |
if (err != JVMTI_ERROR_NONE) {
|
|
653 |
return err;
|
|
654 |
}
|
|
655 |
}
|
|
656 |
}
|
|
657 |
}
|
|
658 |
|
|
659 |
// Get off stack monitors. (e.g. acquired via jni MonitorEnter).
|
|
660 |
JvmtiMonitorClosure jmc(java_thread, calling_thread, owned_monitors_list, this);
|
|
661 |
ObjectSynchronizer::monitors_iterate(&jmc);
|
|
662 |
err = jmc.error();
|
|
663 |
|
|
664 |
return err;
|
|
665 |
}
|
|
666 |
|
|
667 |
// Save JNI local handles for any objects that this frame owns.
|
|
668 |
jvmtiError
|
|
669 |
JvmtiEnvBase::get_locked_objects_in_frame(JavaThread* calling_thread, JavaThread* java_thread,
|
|
670 |
javaVFrame *jvf, GrowableArray<jvmtiMonitorStackDepthInfo*>* owned_monitors_list, int stack_depth) {
|
|
671 |
jvmtiError err = JVMTI_ERROR_NONE;
|
|
672 |
ResourceMark rm;
|
|
673 |
|
|
674 |
GrowableArray<MonitorInfo*>* mons = jvf->monitors();
|
|
675 |
if (mons->is_empty()) {
|
|
676 |
return err; // this javaVFrame holds no monitors
|
|
677 |
}
|
|
678 |
|
|
679 |
HandleMark hm;
|
|
680 |
oop wait_obj = NULL;
|
|
681 |
{
|
|
682 |
// save object of current wait() call (if any) for later comparison
|
|
683 |
ObjectMonitor *mon = java_thread->current_waiting_monitor();
|
|
684 |
if (mon != NULL) {
|
|
685 |
wait_obj = (oop)mon->object();
|
|
686 |
}
|
|
687 |
}
|
|
688 |
oop pending_obj = NULL;
|
|
689 |
{
|
|
690 |
// save object of current enter() call (if any) for later comparison
|
|
691 |
ObjectMonitor *mon = java_thread->current_pending_monitor();
|
|
692 |
if (mon != NULL) {
|
|
693 |
pending_obj = (oop)mon->object();
|
|
694 |
}
|
|
695 |
}
|
|
696 |
|
|
697 |
for (int i = 0; i < mons->length(); i++) {
|
|
698 |
MonitorInfo *mi = mons->at(i);
|
|
699 |
|
|
700 |
oop obj = mi->owner();
|
|
701 |
if (obj == NULL) {
|
|
702 |
// this monitor doesn't have an owning object so skip it
|
|
703 |
continue;
|
|
704 |
}
|
|
705 |
|
|
706 |
if (wait_obj == obj) {
|
|
707 |
// the thread is waiting on this monitor so it isn't really owned
|
|
708 |
continue;
|
|
709 |
}
|
|
710 |
|
|
711 |
if (pending_obj == obj) {
|
|
712 |
// the thread is pending on this monitor so it isn't really owned
|
|
713 |
continue;
|
|
714 |
}
|
|
715 |
|
|
716 |
if (owned_monitors_list->length() > 0) {
|
|
717 |
// Our list has at least one object on it so we have to check
|
|
718 |
// for recursive object locking
|
|
719 |
bool found = false;
|
|
720 |
for (int j = 0; j < owned_monitors_list->length(); j++) {
|
|
721 |
jobject jobj = ((jvmtiMonitorStackDepthInfo*)owned_monitors_list->at(j))->monitor;
|
|
722 |
oop check = JNIHandles::resolve(jobj);
|
|
723 |
if (check == obj) {
|
|
724 |
found = true; // we found the object
|
|
725 |
break;
|
|
726 |
}
|
|
727 |
}
|
|
728 |
|
|
729 |
if (found) {
|
|
730 |
// already have this object so don't include it
|
|
731 |
continue;
|
|
732 |
}
|
|
733 |
}
|
|
734 |
|
|
735 |
// add the owning object to our list
|
|
736 |
jvmtiMonitorStackDepthInfo *jmsdi;
|
|
737 |
err = allocate(sizeof(jvmtiMonitorStackDepthInfo), (unsigned char **)&jmsdi);
|
|
738 |
if (err != JVMTI_ERROR_NONE) {
|
|
739 |
return err;
|
|
740 |
}
|
|
741 |
Handle hobj(obj);
|
|
742 |
jmsdi->monitor = jni_reference(calling_thread, hobj);
|
|
743 |
jmsdi->stack_depth = stack_depth;
|
|
744 |
owned_monitors_list->append(jmsdi);
|
|
745 |
}
|
|
746 |
|
|
747 |
return err;
|
|
748 |
}
|
|
749 |
|
|
750 |
jvmtiError
|
|
751 |
JvmtiEnvBase::get_stack_trace(JavaThread *java_thread,
|
|
752 |
jint start_depth, jint max_count,
|
|
753 |
jvmtiFrameInfo* frame_buffer, jint* count_ptr) {
|
|
754 |
#ifdef ASSERT
|
|
755 |
uint32_t debug_bits = 0;
|
|
756 |
#endif
|
|
757 |
assert((SafepointSynchronize::is_at_safepoint() ||
|
|
758 |
is_thread_fully_suspended(java_thread, false, &debug_bits)),
|
|
759 |
"at safepoint or target thread is suspended");
|
|
760 |
int count = 0;
|
|
761 |
if (java_thread->has_last_Java_frame()) {
|
|
762 |
RegisterMap reg_map(java_thread);
|
|
763 |
Thread* current_thread = Thread::current();
|
|
764 |
ResourceMark rm(current_thread);
|
|
765 |
javaVFrame *jvf = java_thread->last_java_vframe(®_map);
|
|
766 |
HandleMark hm(current_thread);
|
|
767 |
if (start_depth != 0) {
|
|
768 |
if (start_depth > 0) {
|
|
769 |
for (int j = 0; j < start_depth && jvf != NULL; j++) {
|
|
770 |
jvf = jvf->java_sender();
|
|
771 |
}
|
|
772 |
if (jvf == NULL) {
|
|
773 |
// start_depth is deeper than the stack depth
|
|
774 |
return JVMTI_ERROR_ILLEGAL_ARGUMENT;
|
|
775 |
}
|
|
776 |
} else { // start_depth < 0
|
|
777 |
// we are referencing the starting depth based on the oldest
|
|
778 |
// part of the stack.
|
|
779 |
// optimize to limit the number of times that java_sender() is called
|
|
780 |
javaVFrame *jvf_cursor = jvf;
|
|
781 |
javaVFrame *jvf_prev = NULL;
|
|
782 |
javaVFrame *jvf_prev_prev;
|
|
783 |
int j = 0;
|
|
784 |
while (jvf_cursor != NULL) {
|
|
785 |
jvf_prev_prev = jvf_prev;
|
|
786 |
jvf_prev = jvf_cursor;
|
|
787 |
for (j = 0; j > start_depth && jvf_cursor != NULL; j--) {
|
|
788 |
jvf_cursor = jvf_cursor->java_sender();
|
|
789 |
}
|
|
790 |
}
|
|
791 |
if (j == start_depth) {
|
|
792 |
// previous pointer is exactly where we want to start
|
|
793 |
jvf = jvf_prev;
|
|
794 |
} else {
|
|
795 |
// we need to back up further to get to the right place
|
|
796 |
if (jvf_prev_prev == NULL) {
|
|
797 |
// the -start_depth is greater than the stack depth
|
|
798 |
return JVMTI_ERROR_ILLEGAL_ARGUMENT;
|
|
799 |
}
|
|
800 |
// j now is the number of frames on the stack starting with
|
|
801 |
// jvf_prev, we start from jvf_prev_prev and move older on
|
|
802 |
// the stack that many, the result is -start_depth frames
|
|
803 |
// remaining.
|
|
804 |
jvf = jvf_prev_prev;
|
|
805 |
for (; j < 0; j++) {
|
|
806 |
jvf = jvf->java_sender();
|
|
807 |
}
|
|
808 |
}
|
|
809 |
}
|
|
810 |
}
|
|
811 |
for (; count < max_count && jvf != NULL; count++) {
|
|
812 |
frame_buffer[count].method = jvf->method()->jmethod_id();
|
|
813 |
frame_buffer[count].location = (jvf->method()->is_native() ? -1 : jvf->bci());
|
|
814 |
jvf = jvf->java_sender();
|
|
815 |
}
|
|
816 |
} else {
|
|
817 |
if (start_depth != 0) {
|
|
818 |
// no frames and there is a starting depth
|
|
819 |
return JVMTI_ERROR_ILLEGAL_ARGUMENT;
|
|
820 |
}
|
|
821 |
}
|
|
822 |
*count_ptr = count;
|
|
823 |
return JVMTI_ERROR_NONE;
|
|
824 |
}
|
|
825 |
|
|
826 |
jvmtiError
|
|
827 |
JvmtiEnvBase::get_frame_count(JvmtiThreadState *state, jint *count_ptr) {
|
|
828 |
assert((state != NULL),
|
|
829 |
"JavaThread should create JvmtiThreadState before calling this method");
|
|
830 |
*count_ptr = state->count_frames();
|
|
831 |
return JVMTI_ERROR_NONE;
|
|
832 |
}
|
|
833 |
|
|
834 |
jvmtiError
|
|
835 |
JvmtiEnvBase::get_frame_location(JavaThread *java_thread, jint depth,
|
|
836 |
jmethodID* method_ptr, jlocation* location_ptr) {
|
|
837 |
#ifdef ASSERT
|
|
838 |
uint32_t debug_bits = 0;
|
|
839 |
#endif
|
|
840 |
assert((SafepointSynchronize::is_at_safepoint() ||
|
|
841 |
is_thread_fully_suspended(java_thread, false, &debug_bits)),
|
|
842 |
"at safepoint or target thread is suspended");
|
|
843 |
Thread* current_thread = Thread::current();
|
|
844 |
ResourceMark rm(current_thread);
|
|
845 |
|
|
846 |
vframe *vf = vframeFor(java_thread, depth);
|
|
847 |
if (vf == NULL) {
|
|
848 |
return JVMTI_ERROR_NO_MORE_FRAMES;
|
|
849 |
}
|
|
850 |
|
|
851 |
// vframeFor should return a java frame. If it doesn't
|
|
852 |
// it means we've got an internal error and we return the
|
|
853 |
// error in product mode. In debug mode we will instead
|
|
854 |
// attempt to cast the vframe to a javaVFrame and will
|
|
855 |
// cause an assertion/crash to allow further diagnosis.
|
|
856 |
#ifdef PRODUCT
|
|
857 |
if (!vf->is_java_frame()) {
|
|
858 |
return JVMTI_ERROR_INTERNAL;
|
|
859 |
}
|
|
860 |
#endif
|
|
861 |
|
|
862 |
HandleMark hm(current_thread);
|
|
863 |
javaVFrame *jvf = javaVFrame::cast(vf);
|
|
864 |
methodOop method = jvf->method();
|
|
865 |
if (method->is_native()) {
|
|
866 |
*location_ptr = -1;
|
|
867 |
} else {
|
|
868 |
*location_ptr = jvf->bci();
|
|
869 |
}
|
|
870 |
*method_ptr = method->jmethod_id();
|
|
871 |
|
|
872 |
return JVMTI_ERROR_NONE;
|
|
873 |
}
|
|
874 |
|
|
875 |
|
|
876 |
jvmtiError
|
|
877 |
JvmtiEnvBase::get_object_monitor_usage(JavaThread* calling_thread, jobject object, jvmtiMonitorUsage* info_ptr) {
|
|
878 |
HandleMark hm;
|
|
879 |
Handle hobj;
|
|
880 |
|
|
881 |
bool at_safepoint = SafepointSynchronize::is_at_safepoint();
|
|
882 |
|
|
883 |
// Check arguments
|
|
884 |
{
|
|
885 |
oop mirror = JNIHandles::resolve_external_guard(object);
|
|
886 |
NULL_CHECK(mirror, JVMTI_ERROR_INVALID_OBJECT);
|
|
887 |
NULL_CHECK(info_ptr, JVMTI_ERROR_NULL_POINTER);
|
|
888 |
|
|
889 |
hobj = Handle(mirror);
|
|
890 |
}
|
|
891 |
|
|
892 |
JavaThread *owning_thread = NULL;
|
|
893 |
ObjectMonitor *mon = NULL;
|
|
894 |
jvmtiMonitorUsage ret = {
|
|
895 |
NULL, 0, 0, NULL, 0, NULL
|
|
896 |
};
|
|
897 |
|
|
898 |
uint32_t debug_bits = 0;
|
|
899 |
// first derive the object's owner and entry_count (if any)
|
|
900 |
{
|
|
901 |
// Revoke any biases before querying the mark word
|
|
902 |
if (SafepointSynchronize::is_at_safepoint()) {
|
|
903 |
BiasedLocking::revoke_at_safepoint(hobj);
|
|
904 |
} else {
|
|
905 |
BiasedLocking::revoke_and_rebias(hobj, false, calling_thread);
|
|
906 |
}
|
|
907 |
|
|
908 |
address owner = NULL;
|
|
909 |
{
|
|
910 |
markOop mark = hobj()->mark();
|
|
911 |
|
|
912 |
if (!mark->has_monitor()) {
|
|
913 |
// this object has a lightweight monitor
|
|
914 |
|
|
915 |
if (mark->has_locker()) {
|
|
916 |
owner = (address)mark->locker(); // save the address of the Lock word
|
|
917 |
}
|
|
918 |
// implied else: no owner
|
|
919 |
} else {
|
|
920 |
// this object has a heavyweight monitor
|
|
921 |
mon = mark->monitor();
|
|
922 |
|
|
923 |
// The owner field of a heavyweight monitor may be NULL for no
|
|
924 |
// owner, a JavaThread * or it may still be the address of the
|
|
925 |
// Lock word in a JavaThread's stack. A monitor can be inflated
|
|
926 |
// by a non-owning JavaThread, but only the owning JavaThread
|
|
927 |
// can change the owner field from the Lock word to the
|
|
928 |
// JavaThread * and it may not have done that yet.
|
|
929 |
owner = (address)mon->owner();
|
|
930 |
}
|
|
931 |
}
|
|
932 |
|
|
933 |
if (owner != NULL) {
|
|
934 |
// This monitor is owned so we have to find the owning JavaThread.
|
|
935 |
// Since owning_thread_from_monitor_owner() grabs a lock, GC can
|
|
936 |
// move our object at this point. However, our owner value is safe
|
|
937 |
// since it is either the Lock word on a stack or a JavaThread *.
|
|
938 |
owning_thread = Threads::owning_thread_from_monitor_owner(owner, !at_safepoint);
|
|
939 |
assert(owning_thread != NULL, "sanity check");
|
|
940 |
if (owning_thread != NULL) { // robustness
|
|
941 |
// The monitor's owner either has to be the current thread, at safepoint
|
|
942 |
// or it has to be suspended. Any of these conditions will prevent both
|
|
943 |
// contending and waiting threads from modifying the state of
|
|
944 |
// the monitor.
|
|
945 |
if (!at_safepoint && !JvmtiEnv::is_thread_fully_suspended(owning_thread, true, &debug_bits)) {
|
|
946 |
return JVMTI_ERROR_THREAD_NOT_SUSPENDED;
|
|
947 |
}
|
|
948 |
HandleMark hm;
|
|
949 |
Handle th(owning_thread->threadObj());
|
|
950 |
ret.owner = (jthread)jni_reference(calling_thread, th);
|
|
951 |
}
|
|
952 |
// implied else: no owner
|
|
953 |
}
|
|
954 |
|
|
955 |
if (owning_thread != NULL) { // monitor is owned
|
|
956 |
if ((address)owning_thread == owner) {
|
|
957 |
// the owner field is the JavaThread *
|
|
958 |
assert(mon != NULL,
|
|
959 |
"must have heavyweight monitor with JavaThread * owner");
|
|
960 |
ret.entry_count = mon->recursions() + 1;
|
|
961 |
} else {
|
|
962 |
// The owner field is the Lock word on the JavaThread's stack
|
|
963 |
// so the recursions field is not valid. We have to count the
|
|
964 |
// number of recursive monitor entries the hard way. We pass
|
|
965 |
// a handle to survive any GCs along the way.
|
|
966 |
ResourceMark rm;
|
|
967 |
ret.entry_count = count_locked_objects(owning_thread, hobj);
|
|
968 |
}
|
|
969 |
}
|
|
970 |
// implied else: entry_count == 0
|
|
971 |
}
|
|
972 |
|
|
973 |
int nWant,nWait;
|
|
974 |
if (mon != NULL) {
|
|
975 |
// this object has a heavyweight monitor
|
|
976 |
nWant = mon->contentions(); // # of threads contending for monitor
|
|
977 |
nWait = mon->waiters(); // # of threads in Object.wait()
|
|
978 |
ret.waiter_count = nWant + nWait;
|
|
979 |
ret.notify_waiter_count = nWait;
|
|
980 |
} else {
|
|
981 |
// this object has a lightweight monitor
|
|
982 |
ret.waiter_count = 0;
|
|
983 |
ret.notify_waiter_count = 0;
|
|
984 |
}
|
|
985 |
|
|
986 |
// Allocate memory for heavyweight and lightweight monitor.
|
|
987 |
jvmtiError err;
|
|
988 |
err = allocate(ret.waiter_count * sizeof(jthread *), (unsigned char**)&ret.waiters);
|
|
989 |
if (err != JVMTI_ERROR_NONE) {
|
|
990 |
return err;
|
|
991 |
}
|
|
992 |
err = allocate(ret.notify_waiter_count * sizeof(jthread *),
|
|
993 |
(unsigned char**)&ret.notify_waiters);
|
|
994 |
if (err != JVMTI_ERROR_NONE) {
|
|
995 |
deallocate((unsigned char*)ret.waiters);
|
|
996 |
return err;
|
|
997 |
}
|
|
998 |
|
|
999 |
// now derive the rest of the fields
|
|
1000 |
if (mon != NULL) {
|
|
1001 |
// this object has a heavyweight monitor
|
|
1002 |
|
|
1003 |
// Number of waiters may actually be less than the waiter count.
|
|
1004 |
// So NULL out memory so that unused memory will be NULL.
|
|
1005 |
memset(ret.waiters, 0, ret.waiter_count * sizeof(jthread *));
|
|
1006 |
memset(ret.notify_waiters, 0, ret.notify_waiter_count * sizeof(jthread *));
|
|
1007 |
|
|
1008 |
if (ret.waiter_count > 0) {
|
|
1009 |
// we have contending and/or waiting threads
|
|
1010 |
HandleMark hm;
|
|
1011 |
if (nWant > 0) {
|
|
1012 |
// we have contending threads
|
|
1013 |
ResourceMark rm;
|
|
1014 |
// get_pending_threads returns only java thread so we do not need to
|
|
1015 |
// check for non java threads.
|
|
1016 |
GrowableArray<JavaThread*>* wantList = Threads::get_pending_threads(
|
|
1017 |
nWant, (address)mon, !at_safepoint);
|
|
1018 |
if (wantList->length() < nWant) {
|
|
1019 |
// robustness: the pending list has gotten smaller
|
|
1020 |
nWant = wantList->length();
|
|
1021 |
}
|
|
1022 |
for (int i = 0; i < nWant; i++) {
|
|
1023 |
JavaThread *pending_thread = wantList->at(i);
|
|
1024 |
// If the monitor has no owner, then a non-suspended contending
|
|
1025 |
// thread could potentially change the state of the monitor by
|
|
1026 |
// entering it. The JVM/TI spec doesn't allow this.
|
|
1027 |
if (owning_thread == NULL && !at_safepoint &
|
|
1028 |
!JvmtiEnv::is_thread_fully_suspended(pending_thread, true, &debug_bits)) {
|
|
1029 |
if (ret.owner != NULL) {
|
|
1030 |
destroy_jni_reference(calling_thread, ret.owner);
|
|
1031 |
}
|
|
1032 |
for (int j = 0; j < i; j++) {
|
|
1033 |
destroy_jni_reference(calling_thread, ret.waiters[j]);
|
|
1034 |
}
|
|
1035 |
deallocate((unsigned char*)ret.waiters);
|
|
1036 |
deallocate((unsigned char*)ret.notify_waiters);
|
|
1037 |
return JVMTI_ERROR_THREAD_NOT_SUSPENDED;
|
|
1038 |
}
|
|
1039 |
Handle th(pending_thread->threadObj());
|
|
1040 |
ret.waiters[i] = (jthread)jni_reference(calling_thread, th);
|
|
1041 |
}
|
|
1042 |
}
|
|
1043 |
if (nWait > 0) {
|
|
1044 |
// we have threads in Object.wait()
|
|
1045 |
int offset = nWant; // add after any contending threads
|
|
1046 |
ObjectWaiter *waiter = mon->first_waiter();
|
|
1047 |
for (int i = 0, j = 0; i < nWait; i++) {
|
|
1048 |
if (waiter == NULL) {
|
|
1049 |
// robustness: the waiting list has gotten smaller
|
|
1050 |
nWait = j;
|
|
1051 |
break;
|
|
1052 |
}
|
|
1053 |
Thread *t = mon->thread_of_waiter(waiter);
|
|
1054 |
if (t != NULL && t->is_Java_thread()) {
|
|
1055 |
JavaThread *wjava_thread = (JavaThread *)t;
|
|
1056 |
// If the thread was found on the ObjectWaiter list, then
|
|
1057 |
// it has not been notified. This thread can't change the
|
|
1058 |
// state of the monitor so it doesn't need to be suspended.
|
|
1059 |
Handle th(wjava_thread->threadObj());
|
|
1060 |
ret.waiters[offset + j] = (jthread)jni_reference(calling_thread, th);
|
|
1061 |
ret.notify_waiters[j++] = (jthread)jni_reference(calling_thread, th);
|
|
1062 |
}
|
|
1063 |
waiter = mon->next_waiter(waiter);
|
|
1064 |
}
|
|
1065 |
}
|
|
1066 |
}
|
|
1067 |
|
|
1068 |
// Adjust count. nWant and nWait count values may be less than original.
|
|
1069 |
ret.waiter_count = nWant + nWait;
|
|
1070 |
ret.notify_waiter_count = nWait;
|
|
1071 |
} else {
|
|
1072 |
// this object has a lightweight monitor and we have nothing more
|
|
1073 |
// to do here because the defaults are just fine.
|
|
1074 |
}
|
|
1075 |
|
|
1076 |
// we don't update return parameter unless everything worked
|
|
1077 |
*info_ptr = ret;
|
|
1078 |
|
|
1079 |
return JVMTI_ERROR_NONE;
|
|
1080 |
}
|
|
1081 |
|
|
1082 |
ResourceTracker::ResourceTracker(JvmtiEnv* env) {
|
|
1083 |
_env = env;
|
|
1084 |
_allocations = new (ResourceObj::C_HEAP) GrowableArray<unsigned char*>(20, true);
|
|
1085 |
_failed = false;
|
|
1086 |
}
|
|
1087 |
ResourceTracker::~ResourceTracker() {
|
|
1088 |
if (_failed) {
|
|
1089 |
for (int i=0; i<_allocations->length(); i++) {
|
|
1090 |
_env->deallocate(_allocations->at(i));
|
|
1091 |
}
|
|
1092 |
}
|
|
1093 |
delete _allocations;
|
|
1094 |
}
|
|
1095 |
|
|
1096 |
jvmtiError ResourceTracker::allocate(jlong size, unsigned char** mem_ptr) {
|
|
1097 |
unsigned char *ptr;
|
|
1098 |
jvmtiError err = _env->allocate(size, &ptr);
|
|
1099 |
if (err == JVMTI_ERROR_NONE) {
|
|
1100 |
_allocations->append(ptr);
|
|
1101 |
*mem_ptr = ptr;
|
|
1102 |
} else {
|
|
1103 |
*mem_ptr = NULL;
|
|
1104 |
_failed = true;
|
|
1105 |
}
|
|
1106 |
return err;
|
|
1107 |
}
|
|
1108 |
|
|
1109 |
unsigned char* ResourceTracker::allocate(jlong size) {
|
|
1110 |
unsigned char* ptr;
|
|
1111 |
allocate(size, &ptr);
|
|
1112 |
return ptr;
|
|
1113 |
}
|
|
1114 |
|
|
1115 |
char* ResourceTracker::strdup(const char* str) {
|
|
1116 |
char *dup_str = (char*)allocate(strlen(str)+1);
|
|
1117 |
if (dup_str != NULL) {
|
|
1118 |
strcpy(dup_str, str);
|
|
1119 |
}
|
|
1120 |
return dup_str;
|
|
1121 |
}
|
|
1122 |
|
|
1123 |
struct StackInfoNode {
|
|
1124 |
struct StackInfoNode *next;
|
|
1125 |
jvmtiStackInfo info;
|
|
1126 |
};
|
|
1127 |
|
|
1128 |
// Create a jvmtiStackInfo inside a linked list node and create a
|
|
1129 |
// buffer for the frame information, both allocated as resource objects.
|
|
1130 |
// Fill in both the jvmtiStackInfo and the jvmtiFrameInfo.
|
|
1131 |
// Note that either or both of thr and thread_oop
|
|
1132 |
// may be null if the thread is new or has exited.
|
|
1133 |
void
|
|
1134 |
VM_GetMultipleStackTraces::fill_frames(jthread jt, JavaThread *thr, oop thread_oop) {
|
|
1135 |
assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint");
|
|
1136 |
|
|
1137 |
jint state = 0;
|
|
1138 |
struct StackInfoNode *node = NEW_RESOURCE_OBJ(struct StackInfoNode);
|
|
1139 |
jvmtiStackInfo *infop = &(node->info);
|
|
1140 |
node->next = head();
|
|
1141 |
set_head(node);
|
|
1142 |
infop->frame_count = 0;
|
|
1143 |
infop->thread = jt;
|
|
1144 |
|
|
1145 |
if (thread_oop != NULL) {
|
|
1146 |
// get most state bits
|
|
1147 |
state = (jint)java_lang_Thread::get_thread_status(thread_oop);
|
|
1148 |
}
|
|
1149 |
|
|
1150 |
if (thr != NULL) { // add more state bits if there is a JavaThead to query
|
|
1151 |
// same as is_being_ext_suspended() but without locking
|
|
1152 |
if (thr->is_ext_suspended() || thr->is_external_suspend()) {
|
|
1153 |
state |= JVMTI_THREAD_STATE_SUSPENDED;
|
|
1154 |
}
|
|
1155 |
JavaThreadState jts = thr->thread_state();
|
|
1156 |
if (jts == _thread_in_native) {
|
|
1157 |
state |= JVMTI_THREAD_STATE_IN_NATIVE;
|
|
1158 |
}
|
|
1159 |
OSThread* osThread = thr->osthread();
|
|
1160 |
if (osThread != NULL && osThread->interrupted()) {
|
|
1161 |
state |= JVMTI_THREAD_STATE_INTERRUPTED;
|
|
1162 |
}
|
|
1163 |
}
|
|
1164 |
infop->state = state;
|
|
1165 |
|
|
1166 |
if (thr != NULL || (state & JVMTI_THREAD_STATE_ALIVE) != 0) {
|
|
1167 |
infop->frame_buffer = NEW_RESOURCE_ARRAY(jvmtiFrameInfo, max_frame_count());
|
|
1168 |
env()->get_stack_trace(thr, 0, max_frame_count(),
|
|
1169 |
infop->frame_buffer, &(infop->frame_count));
|
|
1170 |
} else {
|
|
1171 |
infop->frame_buffer = NULL;
|
|
1172 |
infop->frame_count = 0;
|
|
1173 |
}
|
|
1174 |
_frame_count_total += infop->frame_count;
|
|
1175 |
}
|
|
1176 |
|
|
1177 |
// Based on the stack information in the linked list, allocate memory
|
|
1178 |
// block to return and fill it from the info in the linked list.
|
|
1179 |
void
|
|
1180 |
VM_GetMultipleStackTraces::allocate_and_fill_stacks(jint thread_count) {
|
|
1181 |
// do I need to worry about alignment issues?
|
|
1182 |
jlong alloc_size = thread_count * sizeof(jvmtiStackInfo)
|
|
1183 |
+ _frame_count_total * sizeof(jvmtiFrameInfo);
|
|
1184 |
env()->allocate(alloc_size, (unsigned char **)&_stack_info);
|
|
1185 |
|
|
1186 |
// pointers to move through the newly allocated space as it is filled in
|
|
1187 |
jvmtiStackInfo *si = _stack_info + thread_count; // bottom of stack info
|
|
1188 |
jvmtiFrameInfo *fi = (jvmtiFrameInfo *)si; // is the top of frame info
|
|
1189 |
|
|
1190 |
// copy information in resource area into allocated buffer
|
|
1191 |
// insert stack info backwards since linked list is backwards
|
|
1192 |
// insert frame info forwards
|
|
1193 |
// walk the StackInfoNodes
|
|
1194 |
for (struct StackInfoNode *sin = head(); sin != NULL; sin = sin->next) {
|
|
1195 |
jint frame_count = sin->info.frame_count;
|
|
1196 |
size_t frames_size = frame_count * sizeof(jvmtiFrameInfo);
|
|
1197 |
--si;
|
|
1198 |
memcpy(si, &(sin->info), sizeof(jvmtiStackInfo));
|
|
1199 |
if (frames_size == 0) {
|
|
1200 |
si->frame_buffer = NULL;
|
|
1201 |
} else {
|
|
1202 |
memcpy(fi, sin->info.frame_buffer, frames_size);
|
|
1203 |
si->frame_buffer = fi; // point to the new allocated copy of the frames
|
|
1204 |
fi += frame_count;
|
|
1205 |
}
|
|
1206 |
}
|
|
1207 |
assert(si == _stack_info, "the last copied stack info must be the first record");
|
|
1208 |
assert((unsigned char *)fi == ((unsigned char *)_stack_info) + alloc_size,
|
|
1209 |
"the last copied frame info must be the last record");
|
|
1210 |
}
|
|
1211 |
|
|
1212 |
|
|
1213 |
void
|
|
1214 |
VM_GetThreadListStackTraces::doit() {
|
|
1215 |
assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint");
|
|
1216 |
|
|
1217 |
ResourceMark rm;
|
|
1218 |
for (int i = 0; i < _thread_count; ++i) {
|
|
1219 |
jthread jt = _thread_list[i];
|
|
1220 |
oop thread_oop = JNIHandles::resolve_external_guard(jt);
|
|
1221 |
if (thread_oop == NULL || !thread_oop->is_a(SystemDictionary::thread_klass())) {
|
|
1222 |
set_result(JVMTI_ERROR_INVALID_THREAD);
|
|
1223 |
return;
|
|
1224 |
}
|
|
1225 |
fill_frames(jt, java_lang_Thread::thread(thread_oop), thread_oop);
|
|
1226 |
}
|
|
1227 |
allocate_and_fill_stacks(_thread_count);
|
|
1228 |
}
|
|
1229 |
|
|
1230 |
void
|
|
1231 |
VM_GetAllStackTraces::doit() {
|
|
1232 |
assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint");
|
|
1233 |
|
|
1234 |
ResourceMark rm;
|
|
1235 |
_final_thread_count = 0;
|
|
1236 |
for (JavaThread *jt = Threads::first(); jt != NULL; jt = jt->next()) {
|
|
1237 |
oop thread_oop = jt->threadObj();
|
|
1238 |
if (thread_oop != NULL &&
|
|
1239 |
!jt->is_exiting() &&
|
|
1240 |
java_lang_Thread::is_alive(thread_oop) &&
|
|
1241 |
!jt->is_hidden_from_external_view()) {
|
|
1242 |
++_final_thread_count;
|
|
1243 |
// Handle block of the calling thread is used to create local refs.
|
|
1244 |
fill_frames((jthread)JNIHandles::make_local(_calling_thread, thread_oop),
|
|
1245 |
jt, thread_oop);
|
|
1246 |
}
|
|
1247 |
}
|
|
1248 |
allocate_and_fill_stacks(_final_thread_count);
|
|
1249 |
}
|
|
1250 |
|
|
1251 |
// Verifies that the top frame is a java frame in an expected state.
|
|
1252 |
// Deoptimizes frame if needed.
|
|
1253 |
// Checks that the frame method signature matches the return type (tos).
|
|
1254 |
// HandleMark must be defined in the caller only.
|
|
1255 |
// It is to keep a ret_ob_h handle alive after return to the caller.
|
|
1256 |
jvmtiError
|
|
1257 |
JvmtiEnvBase::check_top_frame(JavaThread* current_thread, JavaThread* java_thread,
|
|
1258 |
jvalue value, TosState tos, Handle* ret_ob_h) {
|
|
1259 |
ResourceMark rm(current_thread);
|
|
1260 |
|
|
1261 |
vframe *vf = vframeFor(java_thread, 0);
|
|
1262 |
NULL_CHECK(vf, JVMTI_ERROR_NO_MORE_FRAMES);
|
|
1263 |
|
|
1264 |
javaVFrame *jvf = (javaVFrame*) vf;
|
|
1265 |
if (!vf->is_java_frame() || jvf->method()->is_native()) {
|
|
1266 |
return JVMTI_ERROR_OPAQUE_FRAME;
|
|
1267 |
}
|
|
1268 |
|
|
1269 |
// If the frame is a compiled one, need to deoptimize it.
|
|
1270 |
if (vf->is_compiled_frame()) {
|
|
1271 |
if (!vf->fr().can_be_deoptimized()) {
|
|
1272 |
return JVMTI_ERROR_OPAQUE_FRAME;
|
|
1273 |
}
|
|
1274 |
VM_DeoptimizeFrame deopt(java_thread, jvf->fr().id());
|
|
1275 |
VMThread::execute(&deopt);
|
|
1276 |
}
|
|
1277 |
|
|
1278 |
// Get information about method return type
|
|
1279 |
symbolHandle signature(current_thread, jvf->method()->signature());
|
|
1280 |
|
|
1281 |
ResultTypeFinder rtf(signature);
|
|
1282 |
TosState fr_tos = as_TosState(rtf.type());
|
|
1283 |
if (fr_tos != tos) {
|
|
1284 |
if (tos != itos || (fr_tos != btos && fr_tos != ctos && fr_tos != stos)) {
|
|
1285 |
return JVMTI_ERROR_TYPE_MISMATCH;
|
|
1286 |
}
|
|
1287 |
}
|
|
1288 |
|
|
1289 |
// Check that the jobject class matches the return type signature.
|
|
1290 |
jobject jobj = value.l;
|
|
1291 |
if (tos == atos && jobj != NULL) { // NULL reference is allowed
|
|
1292 |
Handle ob_h = Handle(current_thread, JNIHandles::resolve_external_guard(jobj));
|
|
1293 |
NULL_CHECK(ob_h, JVMTI_ERROR_INVALID_OBJECT);
|
|
1294 |
KlassHandle ob_kh = KlassHandle(current_thread, ob_h()->klass());
|
|
1295 |
NULL_CHECK(ob_kh, JVMTI_ERROR_INVALID_OBJECT);
|
|
1296 |
|
|
1297 |
// Method return type signature.
|
|
1298 |
char* ty_sign = 1 + strchr(signature->as_C_string(), ')');
|
|
1299 |
|
|
1300 |
if (!VM_GetOrSetLocal::is_assignable(ty_sign, Klass::cast(ob_kh()), current_thread)) {
|
|
1301 |
return JVMTI_ERROR_TYPE_MISMATCH;
|
|
1302 |
}
|
|
1303 |
*ret_ob_h = ob_h;
|
|
1304 |
}
|
|
1305 |
return JVMTI_ERROR_NONE;
|
|
1306 |
} /* end check_top_frame */
|
|
1307 |
|
|
1308 |
|
|
1309 |
// ForceEarlyReturn<type> follows the PopFrame approach in many aspects.
|
|
1310 |
// Main difference is on the last stage in the interpreter.
|
|
1311 |
// The PopFrame stops method execution to continue execution
|
|
1312 |
// from the same method call instruction.
|
|
1313 |
// The ForceEarlyReturn forces return from method so the execution
|
|
1314 |
// continues at the bytecode following the method call.
|
|
1315 |
|
|
1316 |
// Threads_lock NOT held, java_thread not protected by lock
|
|
1317 |
// java_thread - pre-checked
|
|
1318 |
|
|
1319 |
jvmtiError
|
|
1320 |
JvmtiEnvBase::force_early_return(JavaThread* java_thread, jvalue value, TosState tos) {
|
|
1321 |
JavaThread* current_thread = JavaThread::current();
|
|
1322 |
HandleMark hm(current_thread);
|
|
1323 |
uint32_t debug_bits = 0;
|
|
1324 |
|
|
1325 |
// Check if java_thread is fully suspended
|
|
1326 |
if (!is_thread_fully_suspended(java_thread,
|
|
1327 |
true /* wait for suspend completion */,
|
|
1328 |
&debug_bits)) {
|
|
1329 |
return JVMTI_ERROR_THREAD_NOT_SUSPENDED;
|
|
1330 |
}
|
|
1331 |
|
|
1332 |
// retreive or create the state
|
|
1333 |
JvmtiThreadState* state = JvmtiThreadState::state_for(java_thread);
|
|
1334 |
|
|
1335 |
// Check to see if a ForceEarlyReturn was already in progress
|
|
1336 |
if (state->is_earlyret_pending()) {
|
|
1337 |
// Probably possible for JVMTI clients to trigger this, but the
|
|
1338 |
// JPDA backend shouldn't allow this to happen
|
|
1339 |
return JVMTI_ERROR_INTERNAL;
|
|
1340 |
}
|
|
1341 |
{
|
|
1342 |
// The same as for PopFrame. Workaround bug:
|
|
1343 |
// 4812902: popFrame hangs if the method is waiting at a synchronize
|
|
1344 |
// Catch this condition and return an error to avoid hanging.
|
|
1345 |
// Now JVMTI spec allows an implementation to bail out with an opaque
|
|
1346 |
// frame error.
|
|
1347 |
OSThread* osThread = java_thread->osthread();
|
|
1348 |
if (osThread->get_state() == MONITOR_WAIT) {
|
|
1349 |
return JVMTI_ERROR_OPAQUE_FRAME;
|
|
1350 |
}
|
|
1351 |
}
|
|
1352 |
Handle ret_ob_h = Handle();
|
|
1353 |
jvmtiError err = check_top_frame(current_thread, java_thread, value, tos, &ret_ob_h);
|
|
1354 |
if (err != JVMTI_ERROR_NONE) {
|
|
1355 |
return err;
|
|
1356 |
}
|
|
1357 |
assert(tos != atos || value.l == NULL || ret_ob_h() != NULL,
|
|
1358 |
"return object oop must not be NULL if jobject is not NULL");
|
|
1359 |
|
|
1360 |
// Update the thread state to reflect that the top frame must be
|
|
1361 |
// forced to return.
|
|
1362 |
// The current frame will be returned later when the suspended
|
|
1363 |
// thread is resumed and right before returning from VM to Java.
|
|
1364 |
// (see call_VM_base() in assembler_<cpu>.cpp).
|
|
1365 |
|
|
1366 |
state->set_earlyret_pending();
|
|
1367 |
state->set_earlyret_oop(ret_ob_h());
|
|
1368 |
state->set_earlyret_value(value, tos);
|
|
1369 |
|
|
1370 |
// Set pending step flag for this early return.
|
|
1371 |
// It is cleared when next step event is posted.
|
|
1372 |
state->set_pending_step_for_earlyret();
|
|
1373 |
|
|
1374 |
return JVMTI_ERROR_NONE;
|
|
1375 |
} /* end force_early_return */
|
|
1376 |
|
|
1377 |
void
|
|
1378 |
JvmtiMonitorClosure::do_monitor(ObjectMonitor* mon) {
|
|
1379 |
if ( _error != JVMTI_ERROR_NONE) {
|
|
1380 |
// Error occurred in previous iteration so no need to add
|
|
1381 |
// to the list.
|
|
1382 |
return;
|
|
1383 |
}
|
|
1384 |
if (mon->owner() == _java_thread ) {
|
|
1385 |
// Filter out on stack monitors collected during stack walk.
|
|
1386 |
oop obj = (oop)mon->object();
|
|
1387 |
bool found = false;
|
|
1388 |
for (int j = 0; j < _owned_monitors_list->length(); j++) {
|
|
1389 |
jobject jobj = ((jvmtiMonitorStackDepthInfo*)_owned_monitors_list->at(j))->monitor;
|
|
1390 |
oop check = JNIHandles::resolve(jobj);
|
|
1391 |
if (check == obj) {
|
|
1392 |
// On stack monitor already collected during the stack walk.
|
|
1393 |
found = true;
|
|
1394 |
break;
|
|
1395 |
}
|
|
1396 |
}
|
|
1397 |
if (found == false) {
|
|
1398 |
// This is off stack monitor (e.g. acquired via jni MonitorEnter).
|
|
1399 |
jvmtiError err;
|
|
1400 |
jvmtiMonitorStackDepthInfo *jmsdi;
|
|
1401 |
err = _env->allocate(sizeof(jvmtiMonitorStackDepthInfo), (unsigned char **)&jmsdi);
|
|
1402 |
if (err != JVMTI_ERROR_NONE) {
|
|
1403 |
_error = err;
|
|
1404 |
return;
|
|
1405 |
}
|
|
1406 |
Handle hobj(obj);
|
|
1407 |
jmsdi->monitor = _env->jni_reference(_calling_thread, hobj);
|
|
1408 |
// stack depth is unknown for this monitor.
|
|
1409 |
jmsdi->stack_depth = -1;
|
|
1410 |
_owned_monitors_list->append(jmsdi);
|
|
1411 |
}
|
|
1412 |
}
|
|
1413 |
}
|
|
1414 |
|
|
1415 |
#endif // !JVMTI_KERNEL
|