/* * Copyright (c) 2003, 2025, 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. * */ #ifndef SHARE_PRIMS_JVMTIENVBASE_HPP #define SHARE_PRIMS_JVMTIENVBASE_HPP #include "prims/jvmtiEnvThreadState.hpp" #include "prims/jvmtiEventController.hpp" #include "prims/jvmtiThreadState.hpp" #include "oops/oopHandle.hpp" #include "runtime/atomic.hpp" #include "runtime/fieldDescriptor.hpp" #include "runtime/frame.hpp" #include "runtime/javaThread.hpp" #include "runtime/threads.hpp" #include "runtime/vmOperation.hpp" #include "utilities/growableArray.hpp" #include "utilities/macros.hpp" // // Forward Declarations // class JvmtiEnv; class JvmtiThreadState; class JvmtiRawMonitor; // for jvmtiEnv.hpp class JvmtiEventControllerPrivate; class JvmtiTagMap; // One JvmtiEnv object is created per jvmti attachment; // done via JNI GetEnv() call. Multiple attachments are // allowed in jvmti. class JvmtiEnvBase : public CHeapObj { private: #if INCLUDE_JVMTI static JvmtiEnvBase* _head_environment; // head of environment list #endif // INCLUDE_JVMTI static bool _globally_initialized; static jvmtiPhase _phase; static volatile int _dying_thread_env_iteration_count; public: enum { JDK15_JVMTI_VERSION = JVMTI_VERSION_1_0 + 33, /* version: 1.0.33 */ JDK16_JVMTI_VERSION = JVMTI_VERSION_1_1 + 102, /* version: 1.1.102 */ JDK17_JVMTI_VERSION = JVMTI_VERSION_1_2 + 2 /* version: 1.2.2 */ }; static jvmtiPhase get_phase() { return _phase; } static jvmtiPhase get_phase(jvmtiEnv* env) { return ((JvmtiEnvBase*)JvmtiEnv_from_jvmti_env(env))->phase(); } static void set_phase(jvmtiPhase phase) { _phase = phase; } static bool is_vm_live() { return _phase == JVMTI_PHASE_LIVE; } static void entering_dying_thread_env_iteration() { ++_dying_thread_env_iteration_count; } static void leaving_dying_thread_env_iteration() { --_dying_thread_env_iteration_count; } static bool is_inside_dying_thread_env_iteration(){ return _dying_thread_env_iteration_count > 0; } // This function is to support agents loaded into running VM. static bool enable_virtual_threads_notify_jvmti(); // This function is used in WhiteBox, only needed to test the function above. // It is unsafe to use this function when virtual threads are executed. static bool disable_virtual_threads_notify_jvmti(); static jvmtiError suspend_thread(oop thread_oop, JavaThread* java_thread, bool single_suspend); static jvmtiError resume_thread(oop thread_oop, JavaThread* java_thread, bool single_resume); static jvmtiError check_thread_list(jint count, const jthread* list); static bool is_in_thread_list(jint count, const jthread* list, oop jt_oop); // check if thread_oop represents a thread carrying a virtual thread static bool is_thread_carrying_vthread(JavaThread* java_thread, oop thread_oop) { return java_thread != nullptr && java_thread->jvmti_vthread() != nullptr && java_thread->jvmti_vthread() != thread_oop && java_thread->threadObj() == thread_oop; } private: enum { JVMTI_MAGIC = 0x71EE, DISPOSED_MAGIC = 0xDEFC, BAD_MAGIC = 0xDEAD }; jvmtiEnv _jvmti_external; jint _magic; jint _version; // version value passed to JNI GetEnv() JvmtiEnvBase* _next; bool _is_retransformable; const void *_env_local_storage; // per env agent allocated data. jvmtiEventCallbacks _event_callbacks; jvmtiExtEventCallbacks _ext_event_callbacks; JvmtiTagMap* volatile _tag_map; JvmtiEnvEventEnable _env_event_enable; jvmtiCapabilities _current_capabilities; jvmtiCapabilities _prohibited_capabilities; volatile bool _class_file_load_hook_ever_enabled; static volatile bool _needs_clean_up; char** _native_method_prefixes; int _native_method_prefix_count; protected: JvmtiEnvBase(jint version); ~JvmtiEnvBase(); void dispose(); void env_dispose(); void set_env_local_storage(const void* data) { _env_local_storage = data; } void record_class_file_load_hook_enabled(); void record_first_time_class_file_load_hook_enabled(); char** get_native_method_prefixes() { return _native_method_prefixes; } int get_native_method_prefix_count() { return _native_method_prefix_count; } jvmtiError set_native_method_prefixes(jint prefix_count, char** prefixes); private: friend class JvmtiEventControllerPrivate; void initialize(); void set_event_callbacks(const jvmtiEventCallbacks* callbacks, jint size_of_callbacks); static void globally_initialize(); static void periodic_clean_up(); friend class JvmtiEnvIterator; JvmtiEnv* next_environment() { return (JvmtiEnv*)_next; } void set_next_environment(JvmtiEnvBase* env) { _next = env; } static JvmtiEnv* head_environment() { JVMTI_ONLY(return (JvmtiEnv*)_head_environment); NOT_JVMTI(return nullptr); } public: jvmtiPhase phase(); bool is_valid(); bool use_version_1_0_semantics(); // agent asked for version 1.0 bool use_version_1_1_semantics(); // agent asked for version 1.1 bool use_version_1_2_semantics(); // agent asked for version 1.2 bool is_retransformable() { return _is_retransformable; } const void* get_env_local_storage() { return _env_local_storage; } static ByteSize jvmti_external_offset() { return byte_offset_of(JvmtiEnvBase, _jvmti_external); }; // If (thread == nullptr) then return current thread object. // Otherwise return JNIHandles::resolve_external_guard(thread). static oop current_thread_obj_or_resolve_external_guard(jthread thread); // Return true if the thread identified with a pair is current. // A thread carrying a virtual thread is not treated as current. static bool is_JavaThread_current(JavaThread* jt, oop thr_obj) { JavaThread* current = JavaThread::current(); // jt can be null in case of a virtual thread if (jt == nullptr || jt != current) { return false; } oop cur_obj = current->jvmti_vthread(); // cur_obj == nullptr is true for normal platform threads only // otherwise it can be virtual or carrier thread. return cur_obj == nullptr || cur_obj == thr_obj; } static jvmtiError get_JavaThread(ThreadsList* tlist, jthread thread, JavaThread** jt_pp) { jvmtiError err = JVMTI_ERROR_NONE; if (thread == nullptr) { *jt_pp = JavaThread::current(); } else { err = JvmtiExport::cv_external_thread_to_JavaThread(tlist, thread, jt_pp, nullptr); } return err; } // If there is a virtual thread mounted on the JavaThread* then // return virtual thread oop. Otherwise, return thread oop. static oop get_vthread_or_thread_oop(JavaThread* jt) { oop result = jt->threadObj(); if (jt->jvmti_vthread() != nullptr) { result = jt->jvmti_vthread(); } return result; } static jvmtiError get_threadOop_and_JavaThread(ThreadsList* t_list, jthread thread, JavaThread* cur_thread, JavaThread** jt_pp, oop* thread_oop_p); // Return true if java thread is a carrier thread with a mounted virtual thread. static bool is_cthread_with_mounted_vthread(JavaThread* jt); static bool is_cthread_with_continuation(JavaThread* jt); // Check if VirtualThread or BoundVirtualThread is suspended. static bool is_vthread_suspended(oop vt_oop, JavaThread* jt); // Check for JVMTI_ERROR_NOT_SUSPENDED and JVMTI_ERROR_OPAQUE_FRAME errors. // Used in PopFrame and ForceEarlyReturn implementations. static jvmtiError check_non_suspended_or_opaque_frame(JavaThread* jt, oop thr_obj, bool self); static JvmtiEnv* JvmtiEnv_from_jvmti_env(jvmtiEnv *env) { return (JvmtiEnv*)((intptr_t)env - in_bytes(jvmti_external_offset())); }; jvmtiCapabilities *get_capabilities() { return &_current_capabilities; } jvmtiCapabilities *get_prohibited_capabilities() { return &_prohibited_capabilities; } bool early_class_hook_env() { return get_capabilities()->can_generate_early_class_hook_events != 0 && get_capabilities()->can_generate_all_class_hook_events != 0; } bool early_vmstart_env() { return get_capabilities()->can_generate_early_vmstart != 0; } static char** get_all_native_method_prefixes(int* count_ptr); // This test will answer true when all environments have been disposed and some have // not yet been deallocated. As a result, this test should only be used as an // optimization for the no environment case. static bool environments_might_exist() { return head_environment() != nullptr; } static void check_for_periodic_clean_up(); JvmtiEnvEventEnable *env_event_enable() { return &_env_event_enable; } jvmtiError allocate(jlong size, unsigned char** mem_ptr) { if (size < 0) { return JVMTI_ERROR_ILLEGAL_ARGUMENT; } if (size == 0) { *mem_ptr = nullptr; } else { *mem_ptr = (unsigned char *)os::malloc((size_t)size, mtInternal); if (*mem_ptr == nullptr) { return JVMTI_ERROR_OUT_OF_MEMORY; } } return JVMTI_ERROR_NONE; } jvmtiError deallocate(unsigned char* mem) { if (mem != nullptr) { os::free(mem); } return JVMTI_ERROR_NONE; } // Memory functions unsigned char* jvmtiMalloc(jlong size); // don't use this - call allocate // method to create a local handle jobject jni_reference(Handle hndl); // method to create a local handle. // This function allows caller to specify which // threads local handle table to use. jobject jni_reference(JavaThread *thread, Handle hndl); // method to destroy a local handle void destroy_jni_reference(jobject jobj); // method to destroy a local handle. // This function allows caller to specify which // threads local handle table to use. void destroy_jni_reference(JavaThread *thread, jobject jobj); jvmtiEnv* jvmti_external() { return &_jvmti_external; }; // Event Dispatch bool has_callback(jvmtiEvent event_type) { assert(event_type >= JVMTI_MIN_EVENT_TYPE_VAL && event_type <= JVMTI_MAX_EVENT_TYPE_VAL, "checking"); return ((void**)&_event_callbacks)[event_type-JVMTI_MIN_EVENT_TYPE_VAL] != nullptr; } jvmtiEventCallbacks* callbacks() { return &_event_callbacks; } jvmtiExtEventCallbacks* ext_callbacks() { return &_ext_event_callbacks; } void set_tag_map(JvmtiTagMap* tag_map) { _tag_map = tag_map; } JvmtiTagMap* tag_map() { return _tag_map; } JvmtiTagMap* tag_map_acquire() { return Atomic::load_acquire(&_tag_map); } void release_set_tag_map(JvmtiTagMap* tag_map) { Atomic::release_store(&_tag_map, tag_map); } // return true if event is enabled globally or for any thread // True only if there is a callback for it. bool is_enabled(jvmtiEvent event_type) { return _env_event_enable.is_enabled(event_type); } // Random Utilities protected: // helper methods for creating arrays of global JNI Handles from local Handles // allocated into environment specific storage jthread * new_jthreadArray(int length, Handle *handles); jthreadGroup * new_jthreadGroupArray(int length, objArrayHandle groups); // convert to a jni jclass from a non-null Klass* jclass get_jni_class_non_null(Klass* k); jint count_locked_objects(JavaThread *java_thread, Handle hobj); jvmtiError get_locked_objects_in_frame(JavaThread *calling_thread, JavaThread* java_thread, javaVFrame *jvf, GrowableArray* owned_monitors_list, jint depth, oop vthread = nullptr); public: static javaVFrame* jvf_for_thread_and_depth(JavaThread* java_thread, jint depth); // get a field descriptor for the specified class and field static bool get_field_descriptor(Klass* k, jfieldID field, fieldDescriptor* fd); // check and skip frames hidden in mount/unmount transitions static javaVFrame* skip_yield_frames_for_unmounted_vthread(oop vthread, javaVFrame* jvf); static javaVFrame* check_and_skip_hidden_frames(bool is_in_VTMS_transition, javaVFrame* jvf); static javaVFrame* check_and_skip_hidden_frames(JavaThread* jt, javaVFrame* jvf); // check if virtual thread is not terminated (alive) static bool is_vthread_alive(oop vt); // return JavaThread if virtual thread is mounted, null otherwise static JavaThread* get_JavaThread_or_null(oop vthread); // get virtual thread last java vframe static javaVFrame* get_vthread_jvf(oop vthread); // get carrier thread last java vframe static javaVFrame* get_cthread_last_java_vframe(JavaThread* jt, RegisterMap* reg_map); // get platform thread state static jint get_thread_state_base(oop thread_oop, JavaThread* jt); static jint get_thread_state(oop thread_oop, JavaThread* jt); // get virtual thread state static jint get_vthread_state(oop thread_oop, JavaThread* jt); // get platform or virtual thread state static jint get_thread_or_vthread_state(oop thread_oop, JavaThread* jt); // enumerates the live threads in the given thread group static jvmtiError get_live_threads(JavaThread* current_thread, Handle group_hdl, jint *count_ptr, Handle **thread_objs_p); // enumerates the subgroups in the given thread group static jvmtiError get_subgroups(JavaThread* current_thread, Handle group_hdl, jint *count_ptr, objArrayHandle *group_objs_p); // JVMTI API helper functions which are called when target thread is suspended // or at safepoint / thread local handshake. static jint get_frame_count(javaVFrame* jvf); jvmtiError get_frame_count(JavaThread* java_thread, jint *count_ptr); jvmtiError get_frame_count(oop frame_oop, jint *count_ptr); jvmtiError get_frame_location(javaVFrame* jvf, jint depth, jmethodID* method_ptr, jlocation* location_ptr); jvmtiError get_frame_location(JavaThread* java_thread, jint depth, jmethodID* method_ptr, jlocation* location_ptr); jvmtiError get_frame_location(oop vthread_oop, jint depth, jmethodID* method_ptr, jlocation* location_ptr); jvmtiError set_frame_pop(JvmtiThreadState* state, javaVFrame* jvf, jint depth); jvmtiError clear_all_frame_pops(JvmtiThreadState* state); jvmtiError get_object_monitor_usage(JavaThread* calling_thread, jobject object, jvmtiMonitorUsage* info_ptr); jvmtiError get_stack_trace(javaVFrame* jvf, jint stack_depth, jint max_count, jvmtiFrameInfo* frame_buffer, jint* count_ptr); jvmtiError get_stack_trace(JavaThread* java_thread, jint stack_depth, jint max_count, jvmtiFrameInfo* frame_buffer, jint* count_ptr); jvmtiError get_current_contended_monitor(JavaThread* calling_thread, JavaThread* java_thread, jobject* monitor_ptr, bool is_virtual); jvmtiError get_owned_monitors(JavaThread* calling_thread, JavaThread* java_thread, GrowableArray *owned_monitors_list); jvmtiError get_owned_monitors(JavaThread* calling_thread, JavaThread* carrier, javaVFrame* jvf, GrowableArray *owned_monitors_list, oop vthread); static jvmtiError check_top_frame(Thread* current_thread, JavaThread* java_thread, jvalue value, TosState tos, Handle* ret_ob_h); jvmtiError force_early_return(jthread thread, jvalue value, TosState tos); }; // This class is the only safe means of iterating through environments. // Note that this iteratation includes invalid environments pending // deallocation -- in fact, some uses depend on this behavior. class JvmtiEnvIterator : public StackObj { private: bool _entry_was_marked; public: JvmtiEnvIterator() { if (Threads::number_of_threads() == 0) { _entry_was_marked = false; // we are single-threaded, no need } else { Thread::current()->entering_jvmti_env_iteration(); _entry_was_marked = true; } } ~JvmtiEnvIterator() { if (_entry_was_marked) { Thread::current()->leaving_jvmti_env_iteration(); } } JvmtiEnv* first() { return JvmtiEnvBase::head_environment(); } JvmtiEnv* next(JvmtiEnvBase* env) { return env->next_environment(); } }; #if INCLUDE_JVMTI // This helper class marks current thread as making a Java upcall. // It is needed to hide JVMTI events during JVMTI operation. class JvmtiJavaUpcallMark : public StackObj { private: JavaThread* _current; public: JvmtiJavaUpcallMark(JavaThread* current) { _current = current; assert(!_current->is_in_java_upcall(), "sanity check"); _current->toggle_is_in_java_upcall(); } ~JvmtiJavaUpcallMark() { assert(_current->is_in_java_upcall(), "sanity check"); _current->toggle_is_in_java_upcall(); } }; #endif // INCLUDE_JVMTI // Used in combination with the JvmtiHandshake class. // It is intended to support both platform and virtual threads. class JvmtiUnitedHandshakeClosure : public HandshakeClosure { protected: jvmtiError _result; // the fields below are set by the JvmtiHandshake::execute JavaThread* _target_jt; bool _is_virtual; bool _self; public: JvmtiUnitedHandshakeClosure(const char* name) : HandshakeClosure(name), _result(JVMTI_ERROR_THREAD_NOT_ALIVE), _target_jt(nullptr), _is_virtual(false), _self(false) {} void set_result(jvmtiError err) { _result = err; } void set_target_jt(JavaThread* target_jt) { _target_jt = target_jt; } void set_is_virtual(bool val) { _is_virtual = val; } void set_self(bool val) { _self = val; } jvmtiError result() { return _result; } virtual void do_vthread(Handle target_h) = 0; }; // The JvmtiHandshake supports virtual threads. class JvmtiHandshake : public Handshake { public: static void execute(JvmtiUnitedHandshakeClosure* hs_cl, ThreadsListHandle* tlh, JavaThread* target_jt, Handle target_h); static void execute(JvmtiUnitedHandshakeClosure* hs_cl, jthread target); }; class SetForceEarlyReturn : public JvmtiUnitedHandshakeClosure { private: JvmtiThreadState* _state; jvalue _value; TosState _tos; public: SetForceEarlyReturn(JvmtiThreadState* state, jvalue value, TosState tos) : JvmtiUnitedHandshakeClosure("SetForceEarlyReturn"), _state(state), _value(value), _tos(tos) {} void doit(Thread *target); void do_thread(Thread *target) { doit(target); } void do_vthread(Handle target_h) { assert(_target_jt != nullptr, "sanity check"); // Use jvmti_vthread() instead of vthread() as target could have temporarily changed // identity to carrier thread (see VirtualThread.switchToCarrierThread). assert(_target_jt->jvmti_vthread() == target_h(), "sanity check"); doit(_target_jt); // mounted virtual thread } }; // HandshakeClosure to update for pop top frame. class UpdateForPopTopFrameClosure : public JvmtiUnitedHandshakeClosure { private: JvmtiThreadState* _state; public: UpdateForPopTopFrameClosure(JvmtiThreadState* state) : JvmtiUnitedHandshakeClosure("UpdateForPopTopFrame"), _state(state) {} void doit(Thread *target); void do_thread(Thread *target) { doit(target); } void do_vthread(Handle target_h) { assert(_target_jt != nullptr, "sanity check"); // Use jvmti_vthread() instead of vthread() as target could have temporarily changed // identity to carrier thread (see VirtualThread.switchToCarrierThread). assert(_target_jt->jvmti_vthread() == target_h(), "sanity check"); doit(_target_jt); // mounted virtual thread } }; // HandshakeClosure to set frame pop. class SetOrClearFramePopClosure : public JvmtiUnitedHandshakeClosure { private: JvmtiEnvBase *_env; JvmtiThreadState* _state; bool _set; jint _depth; // used for NotiftyFramePop only public: SetOrClearFramePopClosure(JvmtiEnv *env, JvmtiThreadState* state, bool set, jint depth = 0) : JvmtiUnitedHandshakeClosure("SetOrClearFramePopClosure"), _env((JvmtiEnvBase*)env), _state(state), _set(set), _depth(depth) {} void do_thread(Thread *target); void do_vthread(Handle target_h); }; // HandshakeClosure to get monitor information with stack depth. class GetOwnedMonitorInfoClosure : public JvmtiUnitedHandshakeClosure { private: JvmtiEnv *_env; JavaThread* _calling_thread; GrowableArray *_owned_monitors_list; public: GetOwnedMonitorInfoClosure(JvmtiEnv* env, JavaThread* calling_thread, GrowableArray* owned_monitors_list) : JvmtiUnitedHandshakeClosure("GetOwnedMonitorInfo"), _env(env), _calling_thread(calling_thread), _owned_monitors_list(owned_monitors_list) {} void do_thread(Thread *target); void do_vthread(Handle target_h); }; // VM operation to get object monitor usage. class VM_GetObjectMonitorUsage : public VM_Operation { private: JvmtiEnv *_env; jobject _object; JavaThread* _calling_thread; jvmtiMonitorUsage* _info_ptr; jvmtiError _result; public: VM_GetObjectMonitorUsage(JvmtiEnv *env, JavaThread* calling_thread, jobject object, jvmtiMonitorUsage* info_ptr) { _env = env; _object = object; _calling_thread = calling_thread; _info_ptr = info_ptr; } VMOp_Type type() const { return VMOp_GetObjectMonitorUsage; } jvmtiError result() { return _result; } void doit() { _result = ((JvmtiEnvBase*) _env)->get_object_monitor_usage(_calling_thread, _object, _info_ptr); } }; // HandshakeClosure to get current contended monitor. It is used for both platform and virtual threads. class GetCurrentContendedMonitorClosure : public JvmtiUnitedHandshakeClosure { private: JvmtiEnv *_env; JavaThread *_calling_thread; jobject *_owned_monitor_ptr; public: GetCurrentContendedMonitorClosure(JvmtiEnv *env, JavaThread* calling_thread, jobject *owned_monitor_ptr) : JvmtiUnitedHandshakeClosure("GetCurrentContendedMonitor"), _env(env), _calling_thread(calling_thread), _owned_monitor_ptr(owned_monitor_ptr) {} void do_thread(Thread *target); void do_vthread(Handle target_h); }; // HandshakeClosure to get stack trace. class GetStackTraceClosure : public JvmtiUnitedHandshakeClosure { private: JvmtiEnv *_env; jint _start_depth; jint _max_count; jvmtiFrameInfo *_frame_buffer; jint *_count_ptr; public: GetStackTraceClosure(JvmtiEnv *env, jint start_depth, jint max_count, jvmtiFrameInfo* frame_buffer, jint* count_ptr) : JvmtiUnitedHandshakeClosure("GetStackTrace"), _env(env), _start_depth(start_depth), _max_count(max_count), _frame_buffer(frame_buffer), _count_ptr(count_ptr) {} void do_thread(Thread *target); void do_vthread(Handle target_h); }; #ifdef ASSERT // HandshakeClosure to print stack trace in JvmtiVTMSTransitionDisabler error handling. class PrintStackTraceClosure : public HandshakeClosure { public: static void do_thread_impl(Thread *target); PrintStackTraceClosure() : HandshakeClosure("PrintStackTraceClosure") {} void do_thread(Thread *target); }; #endif // Forward declaration. struct StackInfoNode; // Get stack trace at safepoint or at direct handshake. class MultipleStackTracesCollector { private: friend class VM_GetThreadListStackTraces; JvmtiEnv *_env; jint _max_frame_count; jvmtiStackInfo *_stack_info; jvmtiError _result; int _frame_count_total; struct StackInfoNode *_head; JvmtiEnvBase *env() { return (JvmtiEnvBase *)_env; } jint max_frame_count() { return _max_frame_count; } struct StackInfoNode *head() { return _head; } void set_head(StackInfoNode *head) { _head = head; } public: MultipleStackTracesCollector(JvmtiEnv *env, jint max_frame_count) : _env(env), _max_frame_count(max_frame_count), _stack_info(nullptr), _result(JVMTI_ERROR_NONE), _frame_count_total(0), _head(nullptr) { } void set_result(jvmtiError result) { _result = result; } void fill_frames(jthread jt, JavaThread *thr, oop thread_oop); void allocate_and_fill_stacks(jint thread_count); jvmtiStackInfo *stack_info() { return _stack_info; } jvmtiError result() { return _result; } }; // VM operation to get stack trace at safepoint. class VM_GetAllStackTraces : public VM_Operation { private: JavaThread *_calling_thread; jint _final_thread_count; MultipleStackTracesCollector _collector; public: VM_GetAllStackTraces(JvmtiEnv *env, JavaThread *calling_thread, jint max_frame_count) : _calling_thread(calling_thread), _final_thread_count(0), _collector(env, max_frame_count) { } VMOp_Type type() const { return VMOp_GetAllStackTraces; } void doit(); jint final_thread_count() { return _final_thread_count; } jvmtiStackInfo *stack_info() { return _collector.stack_info(); } jvmtiError result() { return _collector.result(); } }; // VM operation to get stack trace at safepoint. class VM_GetThreadListStackTraces : public VM_Operation { private: jint _thread_count; const jthread* _thread_list; MultipleStackTracesCollector _collector; JvmtiEnvBase *env() { return _collector.env(); } public: VM_GetThreadListStackTraces(JvmtiEnv *env, jint thread_count, const jthread* thread_list, jint max_frame_count) : _thread_count(thread_count), _thread_list(thread_list), _collector(env, max_frame_count) { } VMOp_Type type() const { return VMOp_GetThreadListStackTraces; } void doit(); jvmtiStackInfo *stack_info() { return _collector.stack_info(); } jvmtiError result() { return _collector.result(); } }; // HandshakeClosure to get single stack trace. class GetSingleStackTraceClosure : public JvmtiUnitedHandshakeClosure { private: JavaThread *_calling_thread; jthread _jthread; MultipleStackTracesCollector _collector; public: GetSingleStackTraceClosure(JvmtiEnv *env, JavaThread *calling_thread, jthread thread, jint max_frame_count) : JvmtiUnitedHandshakeClosure("GetSingleStackTrace"), _calling_thread(calling_thread), _jthread(thread), _collector(env, max_frame_count) { } void do_thread(Thread *target); void do_vthread(Handle target_h); void doit(); jvmtiStackInfo *stack_info() { return _collector.stack_info(); } jvmtiError result() { return _result; } }; // HandshakeClosure to count stack frames. class GetFrameCountClosure : public JvmtiUnitedHandshakeClosure { private: JvmtiEnv *_env; jint *_count_ptr; public: GetFrameCountClosure(JvmtiEnv *env, jint *count_ptr) : JvmtiUnitedHandshakeClosure("GetFrameCount"), _env(env), _count_ptr(count_ptr) {} void do_thread(Thread *target); void do_vthread(Handle target_h); }; // HandshakeClosure to get frame location. class GetFrameLocationClosure : public JvmtiUnitedHandshakeClosure { private: JvmtiEnv *_env; jint _depth; jmethodID* _method_ptr; jlocation* _location_ptr; public: GetFrameLocationClosure(JvmtiEnv *env, jint depth, jmethodID* method_ptr, jlocation* location_ptr) : JvmtiUnitedHandshakeClosure("GetFrameLocation"), _env(env), _depth(depth), _method_ptr(method_ptr), _location_ptr(location_ptr) {} void do_thread(Thread *target); void do_vthread(Handle target_h); }; // ResourceTracker // // ResourceTracker works a little like a ResourceMark. All allocates // using the resource tracker are recorded. If an allocate using the // resource tracker fails the destructor will free any resources // that were allocated using the tracker. // The motive for this class is to avoid messy error recovery code // in situations where multiple allocations are done in sequence. If // the second or subsequent allocation fails it avoids any code to // release memory allocated in the previous calls. // // Usage :- // ResourceTracker rt(env); // : // err = rt.allocate(1024, &ptr); class ResourceTracker : public StackObj { private: JvmtiEnv* _env; GrowableArray *_allocations; bool _failed; public: ResourceTracker(JvmtiEnv* env); ~ResourceTracker(); jvmtiError allocate(jlong size, unsigned char** mem_ptr); unsigned char* allocate(jlong size); char* strdup(const char* str); }; // Jvmti monitor closure to collect off stack monitors. class JvmtiMonitorClosure: public MonitorClosure { private: JavaThread *_calling_thread; GrowableArray *_owned_monitors_list; jvmtiError _error; JvmtiEnvBase *_env; public: JvmtiMonitorClosure(JavaThread *calling_thread, GrowableArray *owned_monitors, JvmtiEnvBase *env) { _calling_thread = calling_thread; _owned_monitors_list = owned_monitors; _error = JVMTI_ERROR_NONE; _env = env; } void do_monitor(ObjectMonitor* mon); jvmtiError error() { return _error;} }; // Jvmti module closure to collect all modules loaded to the system. class JvmtiModuleClosure : public StackObj { private: static GrowableArray *_tbl; // Protected with Module_lock static void do_module(ModuleEntry* entry); public: jvmtiError get_all_modules(JvmtiEnv* env, jint* module_count_ptr, jobject** modules_ptr); }; #endif // SHARE_PRIMS_JVMTIENVBASE_HPP