| /* |
| * Copyright (c) 2003, 2014, 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 "jvmtifiles/jvmtiEnv.hpp" |
| #include "oops/objArrayKlass.hpp" |
| #include "oops/objArrayOop.hpp" |
| #include "prims/jvmtiEnvBase.hpp" |
| #include "prims/jvmtiEventController.inline.hpp" |
| #include "prims/jvmtiExtensions.hpp" |
| #include "prims/jvmtiImpl.hpp" |
| #include "prims/jvmtiManageCapabilities.hpp" |
| #include "prims/jvmtiTagMap.hpp" |
| #include "prims/jvmtiThreadState.inline.hpp" |
| #include "runtime/biasedLocking.hpp" |
| #include "runtime/deoptimization.hpp" |
| #include "runtime/interfaceSupport.hpp" |
| #include "runtime/jfieldIDWorkaround.hpp" |
| #include "runtime/objectMonitor.hpp" |
| #include "runtime/objectMonitor.inline.hpp" |
| #include "runtime/signature.hpp" |
| #include "runtime/thread.inline.hpp" |
| #include "runtime/vframe.hpp" |
| #include "runtime/vframe_hp.hpp" |
| #include "runtime/vmThread.hpp" |
| #include "runtime/vm_operations.hpp" |
| |
| /////////////////////////////////////////////////////////////// |
| // |
| // JvmtiEnvBase |
| // |
| |
| JvmtiEnvBase* JvmtiEnvBase::_head_environment = NULL; |
| |
| bool JvmtiEnvBase::_globally_initialized = false; |
| volatile bool JvmtiEnvBase::_needs_clean_up = false; |
| |
| jvmtiPhase JvmtiEnvBase::_phase = JVMTI_PHASE_PRIMORDIAL; |
| |
| volatile int JvmtiEnvBase::_dying_thread_env_iteration_count = 0; |
| |
| extern jvmtiInterface_1_ jvmti_Interface; |
| extern jvmtiInterface_1_ jvmtiTrace_Interface; |
| |
| |
| // perform initializations that must occur before any JVMTI environments |
| // are released but which should only be initialized once (no matter |
| // how many environments are created). |
| void |
| JvmtiEnvBase::globally_initialize() { |
| assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), "sanity check"); |
| assert(_globally_initialized == false, "bad call"); |
| |
| JvmtiManageCapabilities::initialize(); |
| |
| // register extension functions and events |
| JvmtiExtensions::register_extensions(); |
| |
| #ifdef JVMTI_TRACE |
| JvmtiTrace::initialize(); |
| #endif |
| |
| _globally_initialized = true; |
| } |
| |
| |
| void |
| JvmtiEnvBase::initialize() { |
| assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), "sanity check"); |
| |
| // Add this environment to the end of the environment list (order is important) |
| { |
| // This block of code must not contain any safepoints, as list deallocation |
| // (which occurs at a safepoint) cannot occur simultaneously with this list |
| // addition. Note: No_Safepoint_Verifier cannot, currently, be used before |
| // threads exist. |
| JvmtiEnvIterator it; |
| JvmtiEnvBase *previous_env = NULL; |
| for (JvmtiEnvBase* env = it.first(); env != NULL; env = it.next(env)) { |
| previous_env = env; |
| } |
| if (previous_env == NULL) { |
| _head_environment = this; |
| } else { |
| previous_env->set_next_environment(this); |
| } |
| } |
| |
| if (_globally_initialized == false) { |
| globally_initialize(); |
| } |
| } |
| |
| |
| bool |
| JvmtiEnvBase::is_valid() { |
| jint value = 0; |
| |
| // This object might not be a JvmtiEnvBase so we can't assume |
| // the _magic field is properly aligned. Get the value in a safe |
| // way and then check against JVMTI_MAGIC. |
| |
| switch (sizeof(_magic)) { |
| case 2: |
| value = Bytes::get_native_u2((address)&_magic); |
| break; |
| |
| case 4: |
| value = Bytes::get_native_u4((address)&_magic); |
| break; |
| |
| case 8: |
| value = Bytes::get_native_u8((address)&_magic); |
| break; |
| |
| default: |
| guarantee(false, "_magic field is an unexpected size"); |
| } |
| |
| return value == JVMTI_MAGIC; |
| } |
| |
| |
| bool |
| JvmtiEnvBase::use_version_1_0_semantics() { |
| int major, minor, micro; |
| |
| JvmtiExport::decode_version_values(_version, &major, &minor, µ); |
| return major == 1 && minor == 0; // micro version doesn't matter here |
| } |
| |
| |
| bool |
| JvmtiEnvBase::use_version_1_1_semantics() { |
| int major, minor, micro; |
| |
| JvmtiExport::decode_version_values(_version, &major, &minor, µ); |
| return major == 1 && minor == 1; // micro version doesn't matter here |
| } |
| |
| bool |
| JvmtiEnvBase::use_version_1_2_semantics() { |
| int major, minor, micro; |
| |
| JvmtiExport::decode_version_values(_version, &major, &minor, µ); |
| return major == 1 && minor == 2; // micro version doesn't matter here |
| } |
| |
| |
| JvmtiEnvBase::JvmtiEnvBase(jint version) : _env_event_enable() { |
| _version = version; |
| _env_local_storage = NULL; |
| _tag_map = NULL; |
| _native_method_prefix_count = 0; |
| _native_method_prefixes = NULL; |
| _next = NULL; |
| _class_file_load_hook_ever_enabled = false; |
| |
| // Moot since ClassFileLoadHook not yet enabled. |
| // But "true" will give a more predictable ClassFileLoadHook behavior |
| // for environment creation during ClassFileLoadHook. |
| _is_retransformable = true; |
| |
| // all callbacks initially NULL |
| memset(&_event_callbacks,0,sizeof(jvmtiEventCallbacks)); |
| |
| // all capabilities initially off |
| memset(&_current_capabilities, 0, sizeof(_current_capabilities)); |
| |
| // all prohibited capabilities initially off |
| memset(&_prohibited_capabilities, 0, sizeof(_prohibited_capabilities)); |
| |
| _magic = JVMTI_MAGIC; |
| |
| JvmtiEventController::env_initialize((JvmtiEnv*)this); |
| |
| #ifdef JVMTI_TRACE |
| _jvmti_external.functions = TraceJVMTI != NULL ? &jvmtiTrace_Interface : &jvmti_Interface; |
| #else |
| _jvmti_external.functions = &jvmti_Interface; |
| #endif |
| } |
| |
| |
| void |
| JvmtiEnvBase::dispose() { |
| |
| #ifdef JVMTI_TRACE |
| JvmtiTrace::shutdown(); |
| #endif |
| |
| // Dispose of event info and let the event controller call us back |
| // in a locked state (env_dispose, below) |
| JvmtiEventController::env_dispose(this); |
| } |
| |
| void |
| JvmtiEnvBase::env_dispose() { |
| assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), "sanity check"); |
| |
| // We have been entered with all events disabled on this environment. |
| // A race to re-enable events (by setting callbacks) is prevented by |
| // checking for a valid environment when setting callbacks (while |
| // holding the JvmtiThreadState_lock). |
| |
| // Mark as invalid. |
| _magic = DISPOSED_MAGIC; |
| |
| // Relinquish all capabilities. |
| jvmtiCapabilities *caps = get_capabilities(); |
| JvmtiManageCapabilities::relinquish_capabilities(caps, caps, caps); |
| |
| // Same situation as with events (see above) |
| set_native_method_prefixes(0, NULL); |
| |
| JvmtiTagMap* tag_map_to_deallocate = _tag_map; |
| set_tag_map(NULL); |
| // A tag map can be big, deallocate it now |
| if (tag_map_to_deallocate != NULL) { |
| delete tag_map_to_deallocate; |
| } |
| |
| _needs_clean_up = true; |
| } |
| |
| |
| JvmtiEnvBase::~JvmtiEnvBase() { |
| assert(SafepointSynchronize::is_at_safepoint(), "sanity check"); |
| |
| // There is a small window of time during which the tag map of a |
| // disposed environment could have been reallocated. |
| // Make sure it is gone. |
| JvmtiTagMap* tag_map_to_deallocate = _tag_map; |
| set_tag_map(NULL); |
| // A tag map can be big, deallocate it now |
| if (tag_map_to_deallocate != NULL) { |
| delete tag_map_to_deallocate; |
| } |
| |
| _magic = BAD_MAGIC; |
| } |
| |
| |
| void |
| JvmtiEnvBase::periodic_clean_up() { |
| assert(SafepointSynchronize::is_at_safepoint(), "sanity check"); |
| |
| // JvmtiEnvBase reference is saved in JvmtiEnvThreadState. So |
| // clean up JvmtiThreadState before deleting JvmtiEnv pointer. |
| JvmtiThreadState::periodic_clean_up(); |
| |
| // Unlink all invalid environments from the list of environments |
| // and deallocate them |
| JvmtiEnvIterator it; |
| JvmtiEnvBase* previous_env = NULL; |
| JvmtiEnvBase* env = it.first(); |
| while (env != NULL) { |
| if (env->is_valid()) { |
| previous_env = env; |
| env = it.next(env); |
| } else { |
| // This one isn't valid, remove it from the list and deallocate it |
| JvmtiEnvBase* defunct_env = env; |
| env = it.next(env); |
| if (previous_env == NULL) { |
| _head_environment = env; |
| } else { |
| previous_env->set_next_environment(env); |
| } |
| delete defunct_env; |
| } |
| } |
| |
| } |
| |
| |
| void |
| JvmtiEnvBase::check_for_periodic_clean_up() { |
| assert(SafepointSynchronize::is_at_safepoint(), "sanity check"); |
| |
| class ThreadInsideIterationClosure: public ThreadClosure { |
| private: |
| bool _inside; |
| public: |
| ThreadInsideIterationClosure() : _inside(false) {}; |
| |
| void do_thread(Thread* thread) { |
| _inside |= thread->is_inside_jvmti_env_iteration(); |
| } |
| |
| bool is_inside_jvmti_env_iteration() { |
| return _inside; |
| } |
| }; |
| |
| if (_needs_clean_up) { |
| // Check if we are currently iterating environment, |
| // deallocation should not occur if we are |
| ThreadInsideIterationClosure tiic; |
| Threads::threads_do(&tiic); |
| if (!tiic.is_inside_jvmti_env_iteration() && |
| !is_inside_dying_thread_env_iteration()) { |
| _needs_clean_up = false; |
| JvmtiEnvBase::periodic_clean_up(); |
| } |
| } |
| } |
| |
| |
| void |
| JvmtiEnvBase::record_first_time_class_file_load_hook_enabled() { |
| assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), |
| "sanity check"); |
| |
| if (!_class_file_load_hook_ever_enabled) { |
| _class_file_load_hook_ever_enabled = true; |
| |
| if (get_capabilities()->can_retransform_classes) { |
| _is_retransformable = true; |
| } else { |
| _is_retransformable = false; |
| |
| // cannot add retransform capability after ClassFileLoadHook has been enabled |
| get_prohibited_capabilities()->can_retransform_classes = 1; |
| } |
| } |
| } |
| |
| |
| void |
| JvmtiEnvBase::record_class_file_load_hook_enabled() { |
| if (!_class_file_load_hook_ever_enabled) { |
| if (Threads::number_of_threads() == 0) { |
| record_first_time_class_file_load_hook_enabled(); |
| } else { |
| MutexLocker mu(JvmtiThreadState_lock); |
| record_first_time_class_file_load_hook_enabled(); |
| } |
| } |
| } |
| |
| |
| jvmtiError |
| JvmtiEnvBase::set_native_method_prefixes(jint prefix_count, char** prefixes) { |
| assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), |
| "sanity check"); |
| |
| int old_prefix_count = get_native_method_prefix_count(); |
| char **old_prefixes = get_native_method_prefixes(); |
| |
| // allocate and install the new prefixex |
| if (prefix_count == 0 || !is_valid()) { |
| _native_method_prefix_count = 0; |
| _native_method_prefixes = NULL; |
| } else { |
| // there are prefixes, allocate an array to hold them, and fill it |
| char** new_prefixes = (char**)os::malloc((prefix_count) * sizeof(char*), mtInternal); |
| if (new_prefixes == NULL) { |
| return JVMTI_ERROR_OUT_OF_MEMORY; |
| } |
| for (int i = 0; i < prefix_count; i++) { |
| char* prefix = prefixes[i]; |
| if (prefix == NULL) { |
| for (int j = 0; j < (i-1); j++) { |
| os::free(new_prefixes[j]); |
| } |
| os::free(new_prefixes); |
| return JVMTI_ERROR_NULL_POINTER; |
| } |
| prefix = os::strdup(prefixes[i]); |
| if (prefix == NULL) { |
| for (int j = 0; j < (i-1); j++) { |
| os::free(new_prefixes[j]); |
| } |
| os::free(new_prefixes); |
| return JVMTI_ERROR_OUT_OF_MEMORY; |
| } |
| new_prefixes[i] = prefix; |
| } |
| _native_method_prefix_count = prefix_count; |
| _native_method_prefixes = new_prefixes; |
| } |
| |
| // now that we know the new prefixes have been successfully installed we can |
| // safely remove the old ones |
| if (old_prefix_count != 0) { |
| for (int i = 0; i < old_prefix_count; i++) { |
| os::free(old_prefixes[i]); |
| } |
| os::free(old_prefixes); |
| } |
| |
| return JVMTI_ERROR_NONE; |
| } |
| |
| |
| // Collect all the prefixes which have been set in any JVM TI environments |
| // by the SetNativeMethodPrefix(es) functions. Be sure to maintain the |
| // order of environments and the order of prefixes within each environment. |
| // Return in a resource allocated array. |
| char** |
| JvmtiEnvBase::get_all_native_method_prefixes(int* count_ptr) { |
| assert(Threads::number_of_threads() == 0 || |
| SafepointSynchronize::is_at_safepoint() || |
| JvmtiThreadState_lock->is_locked(), |
| "sanity check"); |
| |
| int total_count = 0; |
| GrowableArray<char*>* prefix_array =new GrowableArray<char*>(5); |
| |
| JvmtiEnvIterator it; |
| for (JvmtiEnvBase* env = it.first(); env != NULL; env = it.next(env)) { |
| int prefix_count = env->get_native_method_prefix_count(); |
| char** prefixes = env->get_native_method_prefixes(); |
| for (int j = 0; j < prefix_count; j++) { |
| // retrieve a prefix and so that it is safe against asynchronous changes |
| // copy it into the resource area |
| char* prefix = prefixes[j]; |
| char* prefix_copy = NEW_RESOURCE_ARRAY(char, strlen(prefix)+1); |
| strcpy(prefix_copy, prefix); |
| prefix_array->at_put_grow(total_count++, prefix_copy); |
| } |
| } |
| |
| char** all_prefixes = NEW_RESOURCE_ARRAY(char*, total_count); |
| char** p = all_prefixes; |
| for (int i = 0; i < total_count; ++i) { |
| *p++ = prefix_array->at(i); |
| } |
| *count_ptr = total_count; |
| return all_prefixes; |
| } |
| |
| void |
| JvmtiEnvBase::set_event_callbacks(const jvmtiEventCallbacks* callbacks, |
| jint size_of_callbacks) { |
| assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), "sanity check"); |
| |
| size_t byte_cnt = sizeof(jvmtiEventCallbacks); |
| |
| // clear in either case to be sure we got any gap between sizes |
| memset(&_event_callbacks, 0, byte_cnt); |
| |
| // Now that JvmtiThreadState_lock is held, prevent a possible race condition where events |
| // are re-enabled by a call to set event callbacks where the DisposeEnvironment |
| // occurs after the boiler-plate environment check and before the lock is acquired. |
| if (callbacks != NULL && is_valid()) { |
| if (size_of_callbacks < (jint)byte_cnt) { |
| byte_cnt = size_of_callbacks; |
| } |
| memcpy(&_event_callbacks, callbacks, byte_cnt); |
| } |
| } |
| |
| // Called from JVMTI entry points which perform stack walking. If the |
| // associated JavaThread is the current thread, then wait_for_suspend |
| // is not used. Otherwise, it determines if we should wait for the |
| // "other" thread to complete external suspension. (NOTE: in future |
| // releases the suspension mechanism should be reimplemented so this |
| // is not necessary.) |
| // |
| bool |
| JvmtiEnvBase::is_thread_fully_suspended(JavaThread* thr, bool wait_for_suspend, uint32_t *bits) { |
| // "other" threads require special handling |
| if (thr != JavaThread::current()) { |
| if (wait_for_suspend) { |
| // We are allowed to wait for the external suspend to complete |
| // so give the other thread a chance to get suspended. |
| if (!thr->wait_for_ext_suspend_completion(SuspendRetryCount, |
| SuspendRetryDelay, bits)) { |
| // didn't make it so let the caller know |
| return false; |
| } |
| } |
| // We aren't allowed to wait for the external suspend to complete |
| // so if the other thread isn't externally suspended we need to |
| // let the caller know. |
| else if (!thr->is_ext_suspend_completed_with_lock(bits)) { |
| return false; |
| } |
| } |
| |
| return true; |
| } |
| |
| |
| // In the fullness of time, all users of the method should instead |
| // directly use allocate, besides being cleaner and faster, this will |
| // mean much better out of memory handling |
| unsigned char * |
| JvmtiEnvBase::jvmtiMalloc(jlong size) { |
| unsigned char* mem; |
| jvmtiError result = allocate(size, &mem); |
| assert(result == JVMTI_ERROR_NONE, "Allocate failed"); |
| return mem; |
| } |
| |
| |
| // |
| // Threads |
| // |
| |
| jobject * |
| JvmtiEnvBase::new_jobjectArray(int length, Handle *handles) { |
| if (length == 0) { |
| return NULL; |
| } |
| |
| jobject *objArray = (jobject *) jvmtiMalloc(sizeof(jobject) * length); |
| NULL_CHECK(objArray, NULL); |
| |
| for (int i=0; i<length; i++) { |
| objArray[i] = jni_reference(handles[i]); |
| } |
| return objArray; |
| } |
| |
| jthread * |
| JvmtiEnvBase::new_jthreadArray(int length, Handle *handles) { |
| return (jthread *) new_jobjectArray(length,handles); |
| } |
| |
| jthreadGroup * |
| JvmtiEnvBase::new_jthreadGroupArray(int length, Handle *handles) { |
| return (jthreadGroup *) new_jobjectArray(length,handles); |
| } |
| |
| |
| JavaThread * |
| JvmtiEnvBase::get_JavaThread(jthread jni_thread) { |
| oop t = JNIHandles::resolve_external_guard(jni_thread); |
| if (t == NULL || !t->is_a(SystemDictionary::Thread_klass())) { |
| return NULL; |
| } |
| // The following returns NULL if the thread has not yet run or is in |
| // process of exiting |
| return java_lang_Thread::thread(t); |
| } |
| |
| |
| // return the vframe on the specified thread and depth, NULL if no such frame |
| vframe* |
| JvmtiEnvBase::vframeFor(JavaThread* java_thread, jint depth) { |
| if (!java_thread->has_last_Java_frame()) { |
| return NULL; |
| } |
| RegisterMap reg_map(java_thread); |
| vframe *vf = java_thread->last_java_vframe(®_map); |
| int d = 0; |
| while ((vf != NULL) && (d < depth)) { |
| vf = vf->java_sender(); |
| d++; |
| } |
| return vf; |
| } |
| |
| |
| // |
| // utilities: JNI objects |
| // |
| |
| |
| jclass |
| JvmtiEnvBase::get_jni_class_non_null(Klass* k) { |
| assert(k != NULL, "k != NULL"); |
| return (jclass)jni_reference(k->java_mirror()); |
| } |
| |
| // |
| // Field Information |
| // |
| |
| bool |
| JvmtiEnvBase::get_field_descriptor(Klass* k, jfieldID field, fieldDescriptor* fd) { |
| if (!jfieldIDWorkaround::is_valid_jfieldID(k, field)) { |
| return false; |
| } |
| bool found = false; |
| if (jfieldIDWorkaround::is_static_jfieldID(field)) { |
| JNIid* id = jfieldIDWorkaround::from_static_jfieldID(field); |
| found = id->find_local_field(fd); |
| } else { |
| // Non-static field. The fieldID is really the offset of the field within the object. |
| int offset = jfieldIDWorkaround::from_instance_jfieldID(k, field); |
| found = InstanceKlass::cast(k)->find_field_from_offset(offset, false, fd); |
| } |
| return found; |
| } |
| |
| // |
| // Object Monitor Information |
| // |
| |
| // |
| // Count the number of objects for a lightweight monitor. The hobj |
| // parameter is object that owns the monitor so this routine will |
| // count the number of times the same object was locked by frames |
| // in java_thread. |
| // |
| jint |
| JvmtiEnvBase::count_locked_objects(JavaThread *java_thread, Handle hobj) { |
| jint ret = 0; |
| if (!java_thread->has_last_Java_frame()) { |
| return ret; // no Java frames so no monitors |
| } |
| |
| ResourceMark rm; |
| HandleMark hm; |
| RegisterMap reg_map(java_thread); |
| |
| for(javaVFrame *jvf=java_thread->last_java_vframe(®_map); jvf != NULL; |
| jvf = jvf->java_sender()) { |
| GrowableArray<MonitorInfo*>* mons = jvf->monitors(); |
| if (!mons->is_empty()) { |
| for (int i = 0; i < mons->length(); i++) { |
| MonitorInfo *mi = mons->at(i); |
| if (mi->owner_is_scalar_replaced()) continue; |
| |
| // see if owner of the monitor is our object |
| if (mi->owner() != NULL && mi->owner() == hobj()) { |
| ret++; |
| } |
| } |
| } |
| } |
| return ret; |
| } |
| |
| |
| |
| jvmtiError |
| JvmtiEnvBase::get_current_contended_monitor(JavaThread *calling_thread, JavaThread *java_thread, jobject *monitor_ptr) { |
| #ifdef ASSERT |
| uint32_t debug_bits = 0; |
| #endif |
| assert((SafepointSynchronize::is_at_safepoint() || |
| is_thread_fully_suspended(java_thread, false, &debug_bits)), |
| "at safepoint or target thread is suspended"); |
| oop obj = NULL; |
| ObjectMonitor *mon = java_thread->current_waiting_monitor(); |
| if (mon == NULL) { |
| // thread is not doing an Object.wait() call |
| mon = java_thread->current_pending_monitor(); |
| if (mon != NULL) { |
| // The thread is trying to enter() or raw_enter() an ObjectMonitor. |
| obj = (oop)mon->object(); |
| // If obj == NULL, then ObjectMonitor is raw which doesn't count |
| // as contended for this API |
| } |
| // implied else: no contended ObjectMonitor |
| } else { |
| // thread is doing an Object.wait() call |
| obj = (oop)mon->object(); |
| assert(obj != NULL, "Object.wait() should have an object"); |
| } |
| |
| if (obj == NULL) { |
| *monitor_ptr = NULL; |
| } else { |
| HandleMark hm; |
| Handle hobj(obj); |
| *monitor_ptr = jni_reference(calling_thread, hobj); |
| } |
| return JVMTI_ERROR_NONE; |
| } |
| |
| |
| jvmtiError |
| JvmtiEnvBase::get_owned_monitors(JavaThread *calling_thread, JavaThread* java_thread, |
| GrowableArray<jvmtiMonitorStackDepthInfo*> *owned_monitors_list) { |
| jvmtiError err = JVMTI_ERROR_NONE; |
| #ifdef ASSERT |
| uint32_t debug_bits = 0; |
| #endif |
| assert((SafepointSynchronize::is_at_safepoint() || |
| is_thread_fully_suspended(java_thread, false, &debug_bits)), |
| "at safepoint or target thread is suspended"); |
| |
| if (java_thread->has_last_Java_frame()) { |
| ResourceMark rm; |
| HandleMark hm; |
| RegisterMap reg_map(java_thread); |
| |
| int depth = 0; |
| for (javaVFrame *jvf = java_thread->last_java_vframe(®_map); jvf != NULL; |
| jvf = jvf->java_sender()) { |
| if (depth++ < MaxJavaStackTraceDepth) { // check for stack too deep |
| // add locked objects for this frame into list |
| err = get_locked_objects_in_frame(calling_thread, java_thread, jvf, owned_monitors_list, depth-1); |
| if (err != JVMTI_ERROR_NONE) { |
| return err; |
| } |
| } |
| } |
| } |
| |
| // Get off stack monitors. (e.g. acquired via jni MonitorEnter). |
| JvmtiMonitorClosure jmc(java_thread, calling_thread, owned_monitors_list, this); |
| ObjectSynchronizer::monitors_iterate(&jmc); |
| err = jmc.error(); |
| |
| return err; |
| } |
| |
| // Save JNI local handles for any objects that this frame owns. |
| jvmtiError |
| JvmtiEnvBase::get_locked_objects_in_frame(JavaThread* calling_thread, JavaThread* java_thread, |
| javaVFrame *jvf, GrowableArray<jvmtiMonitorStackDepthInfo*>* owned_monitors_list, int stack_depth) { |
| jvmtiError err = JVMTI_ERROR_NONE; |
| ResourceMark rm; |
| |
| GrowableArray<MonitorInfo*>* mons = jvf->monitors(); |
| if (mons->is_empty()) { |
| return err; // this javaVFrame holds no monitors |
| } |
| |
| HandleMark hm; |
| oop wait_obj = NULL; |
| { |
| // save object of current wait() call (if any) for later comparison |
| ObjectMonitor *mon = java_thread->current_waiting_monitor(); |
| if (mon != NULL) { |
| wait_obj = (oop)mon->object(); |
| } |
| } |
| oop pending_obj = NULL; |
| { |
| // save object of current enter() call (if any) for later comparison |
| ObjectMonitor *mon = java_thread->current_pending_monitor(); |
| if (mon != NULL) { |
| pending_obj = (oop)mon->object(); |
| } |
| } |
| |
| for (int i = 0; i < mons->length(); i++) { |
| MonitorInfo *mi = mons->at(i); |
| |
| if (mi->owner_is_scalar_replaced()) continue; |
| |
| oop obj = mi->owner(); |
| if (obj == NULL) { |
| // this monitor doesn't have an owning object so skip it |
| continue; |
| } |
| |
| if (wait_obj == obj) { |
| // the thread is waiting on this monitor so it isn't really owned |
| continue; |
| } |
| |
| if (pending_obj == obj) { |
| // the thread is pending on this monitor so it isn't really owned |
| continue; |
| } |
| |
| if (owned_monitors_list->length() > 0) { |
| // Our list has at least one object on it so we have to check |
| // for recursive object locking |
| bool found = false; |
| for (int j = 0; j < owned_monitors_list->length(); j++) { |
| jobject jobj = ((jvmtiMonitorStackDepthInfo*)owned_monitors_list->at(j))->monitor; |
| oop check = JNIHandles::resolve(jobj); |
| if (check == obj) { |
| found = true; // we found the object |
| break; |
| } |
| } |
| |
| if (found) { |
| // already have this object so don't include it |
| continue; |
| } |
| } |
| |
| // add the owning object to our list |
| jvmtiMonitorStackDepthInfo *jmsdi; |
| err = allocate(sizeof(jvmtiMonitorStackDepthInfo), (unsigned char **)&jmsdi); |
| if (err != JVMTI_ERROR_NONE) { |
| return err; |
| } |
| Handle hobj(obj); |
| jmsdi->monitor = jni_reference(calling_thread, hobj); |
| jmsdi->stack_depth = stack_depth; |
| owned_monitors_list->append(jmsdi); |
| } |
| |
| return err; |
| } |
| |
| jvmtiError |
| JvmtiEnvBase::get_stack_trace(JavaThread *java_thread, |
| jint start_depth, jint max_count, |
| jvmtiFrameInfo* frame_buffer, jint* count_ptr) { |
| #ifdef ASSERT |
| uint32_t debug_bits = 0; |
| #endif |
| assert((SafepointSynchronize::is_at_safepoint() || |
| is_thread_fully_suspended(java_thread, false, &debug_bits)), |
| "at safepoint or target thread is suspended"); |
| int count = 0; |
| if (java_thread->has_last_Java_frame()) { |
| RegisterMap reg_map(java_thread); |
| Thread* current_thread = Thread::current(); |
| ResourceMark rm(current_thread); |
| javaVFrame *jvf = java_thread->last_java_vframe(®_map); |
| HandleMark hm(current_thread); |
| if (start_depth != 0) { |
| if (start_depth > 0) { |
| for (int j = 0; j < start_depth && jvf != NULL; j++) { |
| jvf = jvf->java_sender(); |
| } |
| if (jvf == NULL) { |
| // start_depth is deeper than the stack depth |
| return JVMTI_ERROR_ILLEGAL_ARGUMENT; |
| } |
| } else { // start_depth < 0 |
| // we are referencing the starting depth based on the oldest |
| // part of the stack. |
| // optimize to limit the number of times that java_sender() is called |
| javaVFrame *jvf_cursor = jvf; |
| javaVFrame *jvf_prev = NULL; |
| javaVFrame *jvf_prev_prev; |
| int j = 0; |
| while (jvf_cursor != NULL) { |
| jvf_prev_prev = jvf_prev; |
| jvf_prev = jvf_cursor; |
| for (j = 0; j > start_depth && jvf_cursor != NULL; j--) { |
| jvf_cursor = jvf_cursor->java_sender(); |
| } |
| } |
| if (j == start_depth) { |
| // previous pointer is exactly where we want to start |
| jvf = jvf_prev; |
| } else { |
| // we need to back up further to get to the right place |
| if (jvf_prev_prev == NULL) { |
| // the -start_depth is greater than the stack depth |
| return JVMTI_ERROR_ILLEGAL_ARGUMENT; |
| } |
| // j now is the number of frames on the stack starting with |
| // jvf_prev, we start from jvf_prev_prev and move older on |
| // the stack that many, the result is -start_depth frames |
| // remaining. |
| jvf = jvf_prev_prev; |
| for (; j < 0; j++) { |
| jvf = jvf->java_sender(); |
| } |
| } |
| } |
| } |
| for (; count < max_count && jvf != NULL; count++) { |
| frame_buffer[count].method = jvf->method()->jmethod_id(); |
| frame_buffer[count].location = (jvf->method()->is_native() ? -1 : jvf->bci()); |
| jvf = jvf->java_sender(); |
| } |
| } else { |
| if (start_depth != 0) { |
| // no frames and there is a starting depth |
| return JVMTI_ERROR_ILLEGAL_ARGUMENT; |
| } |
| } |
| *count_ptr = count; |
| return JVMTI_ERROR_NONE; |
| } |
| |
| jvmtiError |
| JvmtiEnvBase::get_frame_count(JvmtiThreadState *state, jint *count_ptr) { |
| assert((state != NULL), |
| "JavaThread should create JvmtiThreadState before calling this method"); |
| *count_ptr = state->count_frames(); |
| return JVMTI_ERROR_NONE; |
| } |
| |
| jvmtiError |
| JvmtiEnvBase::get_frame_location(JavaThread *java_thread, jint depth, |
| jmethodID* method_ptr, jlocation* location_ptr) { |
| #ifdef ASSERT |
| uint32_t debug_bits = 0; |
| #endif |
| assert((SafepointSynchronize::is_at_safepoint() || |
| is_thread_fully_suspended(java_thread, false, &debug_bits)), |
| "at safepoint or target thread is suspended"); |
| Thread* current_thread = Thread::current(); |
| ResourceMark rm(current_thread); |
| |
| vframe *vf = vframeFor(java_thread, depth); |
| if (vf == NULL) { |
| return JVMTI_ERROR_NO_MORE_FRAMES; |
| } |
| |
| // vframeFor should return a java frame. If it doesn't |
| // it means we've got an internal error and we return the |
| // error in product mode. In debug mode we will instead |
| // attempt to cast the vframe to a javaVFrame and will |
| // cause an assertion/crash to allow further diagnosis. |
| #ifdef PRODUCT |
| if (!vf->is_java_frame()) { |
| return JVMTI_ERROR_INTERNAL; |
| } |
| #endif |
| |
| HandleMark hm(current_thread); |
| javaVFrame *jvf = javaVFrame::cast(vf); |
| Method* method = jvf->method(); |
| if (method->is_native()) { |
| *location_ptr = -1; |
| } else { |
| *location_ptr = jvf->bci(); |
| } |
| *method_ptr = method->jmethod_id(); |
| |
| return JVMTI_ERROR_NONE; |
| } |
| |
| |
| jvmtiError |
| JvmtiEnvBase::get_object_monitor_usage(JavaThread* calling_thread, jobject object, jvmtiMonitorUsage* info_ptr) { |
| HandleMark hm; |
| Handle hobj; |
| |
| bool at_safepoint = SafepointSynchronize::is_at_safepoint(); |
| |
| // Check arguments |
| { |
| oop mirror = JNIHandles::resolve_external_guard(object); |
| NULL_CHECK(mirror, JVMTI_ERROR_INVALID_OBJECT); |
| NULL_CHECK(info_ptr, JVMTI_ERROR_NULL_POINTER); |
| |
| hobj = Handle(mirror); |
| } |
| |
| JavaThread *owning_thread = NULL; |
| ObjectMonitor *mon = NULL; |
| jvmtiMonitorUsage ret = { |
| NULL, 0, 0, NULL, 0, NULL |
| }; |
| |
| uint32_t debug_bits = 0; |
| // first derive the object's owner and entry_count (if any) |
| { |
| // Revoke any biases before querying the mark word |
| if (SafepointSynchronize::is_at_safepoint()) { |
| BiasedLocking::revoke_at_safepoint(hobj); |
| } else { |
| BiasedLocking::revoke_and_rebias(hobj, false, calling_thread); |
| } |
| |
| address owner = NULL; |
| { |
| markOop mark = hobj()->mark(); |
| |
| if (!mark->has_monitor()) { |
| // this object has a lightweight monitor |
| |
| if (mark->has_locker()) { |
| owner = (address)mark->locker(); // save the address of the Lock word |
| } |
| // implied else: no owner |
| } else { |
| // this object has a heavyweight monitor |
| mon = mark->monitor(); |
| |
| // The owner field of a heavyweight monitor may be NULL for no |
| // owner, a JavaThread * or it may still be the address of the |
| // Lock word in a JavaThread's stack. A monitor can be inflated |
| // by a non-owning JavaThread, but only the owning JavaThread |
| // can change the owner field from the Lock word to the |
| // JavaThread * and it may not have done that yet. |
| owner = (address)mon->owner(); |
| } |
| } |
| |
| if (owner != NULL) { |
| // This monitor is owned so we have to find the owning JavaThread. |
| // Since owning_thread_from_monitor_owner() grabs a lock, GC can |
| // move our object at this point. However, our owner value is safe |
| // since it is either the Lock word on a stack or a JavaThread *. |
| owning_thread = Threads::owning_thread_from_monitor_owner(owner, !at_safepoint); |
| // Cannot assume (owning_thread != NULL) here because this function |
| // may not have been called at a safepoint and the owning_thread |
| // might not be suspended. |
| if (owning_thread != NULL) { |
| // The monitor's owner either has to be the current thread, at safepoint |
| // or it has to be suspended. Any of these conditions will prevent both |
| // contending and waiting threads from modifying the state of |
| // the monitor. |
| if (!at_safepoint && !JvmtiEnv::is_thread_fully_suspended(owning_thread, true, &debug_bits)) { |
| // Don't worry! This return of JVMTI_ERROR_THREAD_NOT_SUSPENDED |
| // will not make it back to the JVM/TI agent. The error code will |
| // get intercepted in JvmtiEnv::GetObjectMonitorUsage() which |
| // will retry the call via a VM_GetObjectMonitorUsage VM op. |
| return JVMTI_ERROR_THREAD_NOT_SUSPENDED; |
| } |
| HandleMark hm; |
| Handle th(owning_thread->threadObj()); |
| ret.owner = (jthread)jni_reference(calling_thread, th); |
| } |
| // implied else: no owner |
| } |
| |
| if (owning_thread != NULL) { // monitor is owned |
| // The recursions field of a monitor does not reflect recursions |
| // as lightweight locks before inflating the monitor are not included. |
| // We have to count the number of recursive monitor entries the hard way. |
| // We pass a handle to survive any GCs along the way. |
| ResourceMark rm; |
| ret.entry_count = count_locked_objects(owning_thread, hobj); |
| } |
| // implied else: entry_count == 0 |
| } |
| |
| int nWant,nWait; |
| if (mon != NULL) { |
| // this object has a heavyweight monitor |
| nWant = mon->contentions(); // # of threads contending for monitor |
| nWait = mon->waiters(); // # of threads in Object.wait() |
| ret.waiter_count = nWant + nWait; |
| ret.notify_waiter_count = nWait; |
| } else { |
| // this object has a lightweight monitor |
| ret.waiter_count = 0; |
| ret.notify_waiter_count = 0; |
| } |
| |
| // Allocate memory for heavyweight and lightweight monitor. |
| jvmtiError err; |
| err = allocate(ret.waiter_count * sizeof(jthread *), (unsigned char**)&ret.waiters); |
| if (err != JVMTI_ERROR_NONE) { |
| return err; |
| } |
| err = allocate(ret.notify_waiter_count * sizeof(jthread *), |
| (unsigned char**)&ret.notify_waiters); |
| if (err != JVMTI_ERROR_NONE) { |
| deallocate((unsigned char*)ret.waiters); |
| return err; |
| } |
| |
| // now derive the rest of the fields |
| if (mon != NULL) { |
| // this object has a heavyweight monitor |
| |
| // Number of waiters may actually be less than the waiter count. |
| // So NULL out memory so that unused memory will be NULL. |
| memset(ret.waiters, 0, ret.waiter_count * sizeof(jthread *)); |
| memset(ret.notify_waiters, 0, ret.notify_waiter_count * sizeof(jthread *)); |
| |
| if (ret.waiter_count > 0) { |
| // we have contending and/or waiting threads |
| HandleMark hm; |
| if (nWant > 0) { |
| // we have contending threads |
| ResourceMark rm; |
| // get_pending_threads returns only java thread so we do not need to |
| // check for non java threads. |
| GrowableArray<JavaThread*>* wantList = Threads::get_pending_threads( |
| nWant, (address)mon, !at_safepoint); |
| if (wantList->length() < nWant) { |
| // robustness: the pending list has gotten smaller |
| nWant = wantList->length(); |
| } |
| for (int i = 0; i < nWant; i++) { |
| JavaThread *pending_thread = wantList->at(i); |
| // If the monitor has no owner, then a non-suspended contending |
| // thread could potentially change the state of the monitor by |
| // entering it. The JVM/TI spec doesn't allow this. |
| if (owning_thread == NULL && !at_safepoint & |
| !JvmtiEnv::is_thread_fully_suspended(pending_thread, true, &debug_bits)) { |
| if (ret.owner != NULL) { |
| destroy_jni_reference(calling_thread, ret.owner); |
| } |
| for (int j = 0; j < i; j++) { |
| destroy_jni_reference(calling_thread, ret.waiters[j]); |
| } |
| deallocate((unsigned char*)ret.waiters); |
| deallocate((unsigned char*)ret.notify_waiters); |
| return JVMTI_ERROR_THREAD_NOT_SUSPENDED; |
| } |
| Handle th(pending_thread->threadObj()); |
| ret.waiters[i] = (jthread)jni_reference(calling_thread, th); |
| } |
| } |
| if (nWait > 0) { |
| // we have threads in Object.wait() |
| int offset = nWant; // add after any contending threads |
| ObjectWaiter *waiter = mon->first_waiter(); |
| for (int i = 0, j = 0; i < nWait; i++) { |
| if (waiter == NULL) { |
| // robustness: the waiting list has gotten smaller |
| nWait = j; |
| break; |
| } |
| Thread *t = mon->thread_of_waiter(waiter); |
| if (t != NULL && t->is_Java_thread()) { |
| JavaThread *wjava_thread = (JavaThread *)t; |
| // If the thread was found on the ObjectWaiter list, then |
| // it has not been notified. This thread can't change the |
| // state of the monitor so it doesn't need to be suspended. |
| Handle th(wjava_thread->threadObj()); |
| ret.waiters[offset + j] = (jthread)jni_reference(calling_thread, th); |
| ret.notify_waiters[j++] = (jthread)jni_reference(calling_thread, th); |
| } |
| waiter = mon->next_waiter(waiter); |
| } |
| } |
| } |
| |
| // Adjust count. nWant and nWait count values may be less than original. |
| ret.waiter_count = nWant + nWait; |
| ret.notify_waiter_count = nWait; |
| } else { |
| // this object has a lightweight monitor and we have nothing more |
| // to do here because the defaults are just fine. |
| } |
| |
| // we don't update return parameter unless everything worked |
| *info_ptr = ret; |
| |
| return JVMTI_ERROR_NONE; |
| } |
| |
| ResourceTracker::ResourceTracker(JvmtiEnv* env) { |
| _env = env; |
| _allocations = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<unsigned char*>(20, true); |
| _failed = false; |
| } |
| ResourceTracker::~ResourceTracker() { |
| if (_failed) { |
| for (int i=0; i<_allocations->length(); i++) { |
| _env->deallocate(_allocations->at(i)); |
| } |
| } |
| delete _allocations; |
| } |
| |
| jvmtiError ResourceTracker::allocate(jlong size, unsigned char** mem_ptr) { |
| unsigned char *ptr; |
| jvmtiError err = _env->allocate(size, &ptr); |
| if (err == JVMTI_ERROR_NONE) { |
| _allocations->append(ptr); |
| *mem_ptr = ptr; |
| } else { |
| *mem_ptr = NULL; |
| _failed = true; |
| } |
| return err; |
| } |
| |
| unsigned char* ResourceTracker::allocate(jlong size) { |
| unsigned char* ptr; |
| allocate(size, &ptr); |
| return ptr; |
| } |
| |
| char* ResourceTracker::strdup(const char* str) { |
| char *dup_str = (char*)allocate(strlen(str)+1); |
| if (dup_str != NULL) { |
| strcpy(dup_str, str); |
| } |
| return dup_str; |
| } |
| |
| struct StackInfoNode { |
| struct StackInfoNode *next; |
| jvmtiStackInfo info; |
| }; |
| |
| // Create a jvmtiStackInfo inside a linked list node and create a |
| // buffer for the frame information, both allocated as resource objects. |
| // Fill in both the jvmtiStackInfo and the jvmtiFrameInfo. |
| // Note that either or both of thr and thread_oop |
| // may be null if the thread is new or has exited. |
| void |
| VM_GetMultipleStackTraces::fill_frames(jthread jt, JavaThread *thr, oop thread_oop) { |
| assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint"); |
| |
| jint state = 0; |
| struct StackInfoNode *node = NEW_RESOURCE_OBJ(struct StackInfoNode); |
| jvmtiStackInfo *infop = &(node->info); |
| node->next = head(); |
| set_head(node); |
| infop->frame_count = 0; |
| infop->thread = jt; |
| |
| if (thread_oop != NULL) { |
| // get most state bits |
| state = (jint)java_lang_Thread::get_thread_status(thread_oop); |
| } |
| |
| if (thr != NULL) { // add more state bits if there is a JavaThead to query |
| // same as is_being_ext_suspended() but without locking |
| if (thr->is_ext_suspended() || thr->is_external_suspend()) { |
| state |= JVMTI_THREAD_STATE_SUSPENDED; |
| } |
| JavaThreadState jts = thr->thread_state(); |
| if (jts == _thread_in_native) { |
| state |= JVMTI_THREAD_STATE_IN_NATIVE; |
| } |
| OSThread* osThread = thr->osthread(); |
| if (osThread != NULL && osThread->interrupted()) { |
| state |= JVMTI_THREAD_STATE_INTERRUPTED; |
| } |
| } |
| infop->state = state; |
| |
| if (thr != NULL || (state & JVMTI_THREAD_STATE_ALIVE) != 0) { |
| infop->frame_buffer = NEW_RESOURCE_ARRAY(jvmtiFrameInfo, max_frame_count()); |
| env()->get_stack_trace(thr, 0, max_frame_count(), |
| infop->frame_buffer, &(infop->frame_count)); |
| } else { |
| infop->frame_buffer = NULL; |
| infop->frame_count = 0; |
| } |
| _frame_count_total += infop->frame_count; |
| } |
| |
| // Based on the stack information in the linked list, allocate memory |
| // block to return and fill it from the info in the linked list. |
| void |
| VM_GetMultipleStackTraces::allocate_and_fill_stacks(jint thread_count) { |
| // do I need to worry about alignment issues? |
| jlong alloc_size = thread_count * sizeof(jvmtiStackInfo) |
| + _frame_count_total * sizeof(jvmtiFrameInfo); |
| env()->allocate(alloc_size, (unsigned char **)&_stack_info); |
| |
| // pointers to move through the newly allocated space as it is filled in |
| jvmtiStackInfo *si = _stack_info + thread_count; // bottom of stack info |
| jvmtiFrameInfo *fi = (jvmtiFrameInfo *)si; // is the top of frame info |
| |
| // copy information in resource area into allocated buffer |
| // insert stack info backwards since linked list is backwards |
| // insert frame info forwards |
| // walk the StackInfoNodes |
| for (struct StackInfoNode *sin = head(); sin != NULL; sin = sin->next) { |
| jint frame_count = sin->info.frame_count; |
| size_t frames_size = frame_count * sizeof(jvmtiFrameInfo); |
| --si; |
| memcpy(si, &(sin->info), sizeof(jvmtiStackInfo)); |
| if (frames_size == 0) { |
| si->frame_buffer = NULL; |
| } else { |
| memcpy(fi, sin->info.frame_buffer, frames_size); |
| si->frame_buffer = fi; // point to the new allocated copy of the frames |
| fi += frame_count; |
| } |
| } |
| assert(si == _stack_info, "the last copied stack info must be the first record"); |
| assert((unsigned char *)fi == ((unsigned char *)_stack_info) + alloc_size, |
| "the last copied frame info must be the last record"); |
| } |
| |
| |
| void |
| VM_GetThreadListStackTraces::doit() { |
| assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint"); |
| |
| ResourceMark rm; |
| for (int i = 0; i < _thread_count; ++i) { |
| jthread jt = _thread_list[i]; |
| oop thread_oop = JNIHandles::resolve_external_guard(jt); |
| if (thread_oop == NULL || !thread_oop->is_a(SystemDictionary::Thread_klass())) { |
| set_result(JVMTI_ERROR_INVALID_THREAD); |
| return; |
| } |
| fill_frames(jt, java_lang_Thread::thread(thread_oop), thread_oop); |
| } |
| allocate_and_fill_stacks(_thread_count); |
| } |
| |
| void |
| VM_GetAllStackTraces::doit() { |
| assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint"); |
| |
| ResourceMark rm; |
| _final_thread_count = 0; |
| for (JavaThread *jt = Threads::first(); jt != NULL; jt = jt->next()) { |
| oop thread_oop = jt->threadObj(); |
| if (thread_oop != NULL && |
| !jt->is_exiting() && |
| java_lang_Thread::is_alive(thread_oop) && |
| !jt->is_hidden_from_external_view()) { |
| ++_final_thread_count; |
| // Handle block of the calling thread is used to create local refs. |
| fill_frames((jthread)JNIHandles::make_local(_calling_thread, thread_oop), |
| jt, thread_oop); |
| } |
| } |
| allocate_and_fill_stacks(_final_thread_count); |
| } |
| |
| // Verifies that the top frame is a java frame in an expected state. |
| // Deoptimizes frame if needed. |
| // Checks that the frame method signature matches the return type (tos). |
| // HandleMark must be defined in the caller only. |
| // It is to keep a ret_ob_h handle alive after return to the caller. |
| jvmtiError |
| JvmtiEnvBase::check_top_frame(JavaThread* current_thread, JavaThread* java_thread, |
| jvalue value, TosState tos, Handle* ret_ob_h) { |
| ResourceMark rm(current_thread); |
| |
| vframe *vf = vframeFor(java_thread, 0); |
| NULL_CHECK(vf, JVMTI_ERROR_NO_MORE_FRAMES); |
| |
| javaVFrame *jvf = (javaVFrame*) vf; |
| if (!vf->is_java_frame() || jvf->method()->is_native()) { |
| return JVMTI_ERROR_OPAQUE_FRAME; |
| } |
| |
| // If the frame is a compiled one, need to deoptimize it. |
| if (vf->is_compiled_frame()) { |
| if (!vf->fr().can_be_deoptimized()) { |
| return JVMTI_ERROR_OPAQUE_FRAME; |
| } |
| Deoptimization::deoptimize_frame(java_thread, jvf->fr().id()); |
| } |
| |
| // Get information about method return type |
| Symbol* signature = jvf->method()->signature(); |
| |
| ResultTypeFinder rtf(signature); |
| TosState fr_tos = as_TosState(rtf.type()); |
| if (fr_tos != tos) { |
| if (tos != itos || (fr_tos != btos && fr_tos != ctos && fr_tos != stos)) { |
| return JVMTI_ERROR_TYPE_MISMATCH; |
| } |
| } |
| |
| // Check that the jobject class matches the return type signature. |
| jobject jobj = value.l; |
| if (tos == atos && jobj != NULL) { // NULL reference is allowed |
| Handle ob_h = Handle(current_thread, JNIHandles::resolve_external_guard(jobj)); |
| NULL_CHECK(ob_h, JVMTI_ERROR_INVALID_OBJECT); |
| KlassHandle ob_kh = KlassHandle(current_thread, ob_h()->klass()); |
| NULL_CHECK(ob_kh, JVMTI_ERROR_INVALID_OBJECT); |
| |
| // Method return type signature. |
| char* ty_sign = 1 + strchr(signature->as_C_string(), ')'); |
| |
| if (!VM_GetOrSetLocal::is_assignable(ty_sign, ob_kh(), current_thread)) { |
| return JVMTI_ERROR_TYPE_MISMATCH; |
| } |
| *ret_ob_h = ob_h; |
| } |
| return JVMTI_ERROR_NONE; |
| } /* end check_top_frame */ |
| |
| |
| // ForceEarlyReturn<type> follows the PopFrame approach in many aspects. |
| // Main difference is on the last stage in the interpreter. |
| // The PopFrame stops method execution to continue execution |
| // from the same method call instruction. |
| // The ForceEarlyReturn forces return from method so the execution |
| // continues at the bytecode following the method call. |
| |
| // Threads_lock NOT held, java_thread not protected by lock |
| // java_thread - pre-checked |
| |
| jvmtiError |
| JvmtiEnvBase::force_early_return(JavaThread* java_thread, jvalue value, TosState tos) { |
| JavaThread* current_thread = JavaThread::current(); |
| HandleMark hm(current_thread); |
| uint32_t debug_bits = 0; |
| |
| // retrieve or create the state |
| JvmtiThreadState* state = JvmtiThreadState::state_for(java_thread); |
| if (state == NULL) { |
| return JVMTI_ERROR_THREAD_NOT_ALIVE; |
| } |
| |
| // Check if java_thread is fully suspended |
| if (!is_thread_fully_suspended(java_thread, |
| true /* wait for suspend completion */, |
| &debug_bits)) { |
| return JVMTI_ERROR_THREAD_NOT_SUSPENDED; |
| } |
| |
| // Check to see if a ForceEarlyReturn was already in progress |
| if (state->is_earlyret_pending()) { |
| // Probably possible for JVMTI clients to trigger this, but the |
| // JPDA backend shouldn't allow this to happen |
| return JVMTI_ERROR_INTERNAL; |
| } |
| { |
| // The same as for PopFrame. Workaround bug: |
| // 4812902: popFrame hangs if the method is waiting at a synchronize |
| // Catch this condition and return an error to avoid hanging. |
| // Now JVMTI spec allows an implementation to bail out with an opaque |
| // frame error. |
| OSThread* osThread = java_thread->osthread(); |
| if (osThread->get_state() == MONITOR_WAIT) { |
| return JVMTI_ERROR_OPAQUE_FRAME; |
| } |
| } |
| Handle ret_ob_h = Handle(); |
| jvmtiError err = check_top_frame(current_thread, java_thread, value, tos, &ret_ob_h); |
| if (err != JVMTI_ERROR_NONE) { |
| return err; |
| } |
| assert(tos != atos || value.l == NULL || ret_ob_h() != NULL, |
| "return object oop must not be NULL if jobject is not NULL"); |
| |
| // Update the thread state to reflect that the top frame must be |
| // forced to return. |
| // The current frame will be returned later when the suspended |
| // thread is resumed and right before returning from VM to Java. |
| // (see call_VM_base() in assembler_<cpu>.cpp). |
| |
| state->set_earlyret_pending(); |
| state->set_earlyret_oop(ret_ob_h()); |
| state->set_earlyret_value(value, tos); |
| |
| // Set pending step flag for this early return. |
| // It is cleared when next step event is posted. |
| state->set_pending_step_for_earlyret(); |
| |
| return JVMTI_ERROR_NONE; |
| } /* end force_early_return */ |
| |
| void |
| JvmtiMonitorClosure::do_monitor(ObjectMonitor* mon) { |
| if ( _error != JVMTI_ERROR_NONE) { |
| // Error occurred in previous iteration so no need to add |
| // to the list. |
| return; |
| } |
| if (mon->owner() == _java_thread ) { |
| // Filter out on stack monitors collected during stack walk. |
| oop obj = (oop)mon->object(); |
| bool found = false; |
| for (int j = 0; j < _owned_monitors_list->length(); j++) { |
| jobject jobj = ((jvmtiMonitorStackDepthInfo*)_owned_monitors_list->at(j))->monitor; |
| oop check = JNIHandles::resolve(jobj); |
| if (check == obj) { |
| // On stack monitor already collected during the stack walk. |
| found = true; |
| break; |
| } |
| } |
| if (found == false) { |
| // This is off stack monitor (e.g. acquired via jni MonitorEnter). |
| jvmtiError err; |
| jvmtiMonitorStackDepthInfo *jmsdi; |
| err = _env->allocate(sizeof(jvmtiMonitorStackDepthInfo), (unsigned char **)&jmsdi); |
| if (err != JVMTI_ERROR_NONE) { |
| _error = err; |
| return; |
| } |
| Handle hobj(obj); |
| jmsdi->monitor = _env->jni_reference(_calling_thread, hobj); |
| // stack depth is unknown for this monitor. |
| jmsdi->stack_depth = -1; |
| _owned_monitors_list->append(jmsdi); |
| } |
| } |
| } |