1 /* 2 * Copyright (c) 2003, 2017, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #ifndef SHARE_VM_PRIMS_JVMTIENVBASE_HPP 26 #define SHARE_VM_PRIMS_JVMTIENVBASE_HPP 27 28 #include "classfile/classLoader.hpp" 29 #include "prims/jvmtiEnvThreadState.hpp" 30 #include "prims/jvmtiEventController.hpp" 31 #include "prims/jvmtiThreadState.hpp" 32 #include "prims/jvmtiThreadState.inline.hpp" 33 #include "oops/oopHandle.hpp" 34 #include "runtime/fieldDescriptor.hpp" 35 #include "runtime/frame.hpp" 36 #include "runtime/handles.inline.hpp" 37 #include "runtime/thread.hpp" 38 #include "runtime/vm_operations.hpp" 39 #include "utilities/growableArray.hpp" 40 #include "utilities/macros.hpp" 41 42 // 43 // Forward Declarations 44 // 45 46 class JvmtiEnv; 47 class JvmtiThreadState; 48 class JvmtiRawMonitor; // for jvmtiEnv.hpp 49 class JvmtiEventControllerPrivate; 50 class JvmtiTagMap; 51 52 53 54 // One JvmtiEnv object is created per jvmti attachment; 55 // done via JNI GetEnv() call. Multiple attachments are 56 // allowed in jvmti. 57 58 class JvmtiEnvBase : public CHeapObj<mtInternal> { 59 60 private: 61 62 #if INCLUDE_JVMTI 63 static JvmtiEnvBase* _head_environment; // head of environment list 64 #endif // INCLUDE_JVMTI 65 66 static bool _globally_initialized; 67 static jvmtiPhase _phase; 68 static volatile int _dying_thread_env_iteration_count; 69 70 public: 71 72 enum { 73 JDK15_JVMTI_VERSION = JVMTI_VERSION_1_0 + 33, /* version: 1.0.33 */ 74 JDK16_JVMTI_VERSION = JVMTI_VERSION_1_1 + 102, /* version: 1.1.102 */ 75 JDK17_JVMTI_VERSION = JVMTI_VERSION_1_2 + 2 /* version: 1.2.2 */ 76 }; 77 78 static jvmtiPhase get_phase() { return _phase; } 79 static jvmtiPhase get_phase(jvmtiEnv* env) { return ((JvmtiEnvBase*)JvmtiEnv_from_jvmti_env(env))->phase(); } 80 static void set_phase(jvmtiPhase phase) { _phase = phase; } 81 static bool is_vm_live() { return _phase == JVMTI_PHASE_LIVE; } 82 83 static void entering_dying_thread_env_iteration() { ++_dying_thread_env_iteration_count; } 84 static void leaving_dying_thread_env_iteration() { --_dying_thread_env_iteration_count; } 85 static bool is_inside_dying_thread_env_iteration(){ return _dying_thread_env_iteration_count > 0; } 86 87 private: 88 89 enum { 90 JVMTI_MAGIC = 0x71EE, 91 DISPOSED_MAGIC = 0xDEFC, 92 BAD_MAGIC = 0xDEAD 93 }; 94 95 jvmtiEnv _jvmti_external; 96 jint _magic; 97 jint _version; // version value passed to JNI GetEnv() 98 JvmtiEnvBase* _next; 99 bool _is_retransformable; 100 const void *_env_local_storage; // per env agent allocated data. 101 jvmtiEventCallbacks _event_callbacks; 102 jvmtiExtEventCallbacks _ext_event_callbacks; 103 JvmtiTagMap* _tag_map; 104 JvmtiEnvEventEnable _env_event_enable; 105 jvmtiCapabilities _current_capabilities; 106 jvmtiCapabilities _prohibited_capabilities; 107 volatile bool _class_file_load_hook_ever_enabled; 108 static volatile bool _needs_clean_up; 109 char** _native_method_prefixes; 110 int _native_method_prefix_count; 111 112 protected: 113 JvmtiEnvBase(jint version); 114 ~JvmtiEnvBase(); 115 void dispose(); 116 void env_dispose(); 117 118 void set_env_local_storage(const void* data) { _env_local_storage = data; } 119 const void* get_env_local_storage() { return _env_local_storage; } 120 121 void record_class_file_load_hook_enabled(); 122 void record_first_time_class_file_load_hook_enabled(); 123 124 char** get_native_method_prefixes() { return _native_method_prefixes; } 125 int get_native_method_prefix_count() { return _native_method_prefix_count; } 126 jvmtiError set_native_method_prefixes(jint prefix_count, char** prefixes); 127 128 private: 129 friend class JvmtiEventControllerPrivate; 130 void initialize(); 131 void set_event_callbacks(const jvmtiEventCallbacks* callbacks, jint size_of_callbacks); 132 static void globally_initialize(); 133 static void periodic_clean_up(); 134 135 friend class JvmtiEnvIterator; 136 JvmtiEnv* next_environment() { return (JvmtiEnv*)_next; } 137 void set_next_environment(JvmtiEnvBase* env) { _next = env; } 138 static JvmtiEnv* head_environment() { 139 JVMTI_ONLY(return (JvmtiEnv*)_head_environment); 140 NOT_JVMTI(return NULL); 141 } 142 143 public: 144 145 jvmtiPhase phase(); 146 bool is_valid(); 147 148 bool use_version_1_0_semantics(); // agent asked for version 1.0 149 bool use_version_1_1_semantics(); // agent asked for version 1.1 150 bool use_version_1_2_semantics(); // agent asked for version 1.2 151 152 bool is_retransformable() { return _is_retransformable; } 153 154 static ByteSize jvmti_external_offset() { 155 return byte_offset_of(JvmtiEnvBase, _jvmti_external); 156 }; 157 158 static JvmtiEnv* JvmtiEnv_from_jvmti_env(jvmtiEnv *env) { 159 return (JvmtiEnv*)((intptr_t)env - in_bytes(jvmti_external_offset())); 160 }; 161 162 jvmtiCapabilities *get_capabilities() { return &_current_capabilities; } 163 164 jvmtiCapabilities *get_prohibited_capabilities() { return &_prohibited_capabilities; } 165 166 bool early_class_hook_env() { 167 return get_capabilities()->can_generate_early_class_hook_events != 0 168 && get_capabilities()->can_generate_all_class_hook_events != 0; 169 } 170 171 bool early_vmstart_env() { 172 return get_capabilities()->can_generate_early_vmstart != 0; 173 } 174 175 static char** get_all_native_method_prefixes(int* count_ptr); 176 177 // This test will answer true when all environments have been disposed and some have 178 // not yet been deallocated. As a result, this test should only be used as an 179 // optimization for the no environment case. 180 static bool environments_might_exist() { 181 return head_environment() != NULL; 182 } 183 184 static void check_for_periodic_clean_up(); 185 186 JvmtiEnvEventEnable *env_event_enable() { 187 return &_env_event_enable; 188 } 189 190 jvmtiError allocate(jlong size, unsigned char** mem_ptr) { 191 if (size < 0) { 192 return JVMTI_ERROR_ILLEGAL_ARGUMENT; 193 } 194 if (size == 0) { 195 *mem_ptr = NULL; 196 } else { 197 *mem_ptr = (unsigned char *)os::malloc((size_t)size, mtInternal); 198 if (*mem_ptr == NULL) { 199 return JVMTI_ERROR_OUT_OF_MEMORY; 200 } 201 } 202 return JVMTI_ERROR_NONE; 203 } 204 205 jvmtiError deallocate(unsigned char* mem) { 206 if (mem != NULL) { 207 os::free(mem); 208 } 209 return JVMTI_ERROR_NONE; 210 } 211 212 213 // Memory functions 214 unsigned char* jvmtiMalloc(jlong size); // don't use this - call allocate 215 216 // method to create a local handle 217 jobject jni_reference(Handle hndl) { 218 return JNIHandles::make_local(hndl()); 219 } 220 221 // method to create a local handle. 222 // This function allows caller to specify which 223 // threads local handle table to use. 224 jobject jni_reference(JavaThread *thread, Handle hndl) { 225 return JNIHandles::make_local(thread, hndl()); 226 } 227 228 // method to destroy a local handle 229 void destroy_jni_reference(jobject jobj) { 230 JNIHandles::destroy_local(jobj); 231 } 232 233 // method to destroy a local handle. 234 // This function allows caller to specify which 235 // threads local handle table to use although currently it is 236 // not used. 237 void destroy_jni_reference(JavaThread *thread, jobject jobj) { 238 destroy_jni_reference(jobj); 239 } 240 241 jvmtiEnv* jvmti_external() { return &_jvmti_external; }; 242 243 // Event Dispatch 244 245 bool has_callback(jvmtiEvent event_type) { 246 assert(event_type >= JVMTI_MIN_EVENT_TYPE_VAL && 247 event_type <= JVMTI_MAX_EVENT_TYPE_VAL, "checking"); 248 return ((void**)&_event_callbacks)[event_type-JVMTI_MIN_EVENT_TYPE_VAL] != NULL; 249 } 250 251 jvmtiEventCallbacks* callbacks() { 252 return &_event_callbacks; 253 } 254 255 jvmtiExtEventCallbacks* ext_callbacks() { 256 return &_ext_event_callbacks; 257 } 258 259 void set_tag_map(JvmtiTagMap* tag_map) { 260 _tag_map = tag_map; 261 } 262 263 JvmtiTagMap* tag_map() { 264 return _tag_map; 265 } 266 267 268 // return true if event is enabled globally or for any thread 269 // True only if there is a callback for it. 270 bool is_enabled(jvmtiEvent event_type) { 271 return _env_event_enable.is_enabled(event_type); 272 } 273 274 // Random Utilities 275 276 protected: 277 // helper methods for creating arrays of global JNI Handles from local Handles 278 // allocated into environment specific storage 279 jobject * new_jobjectArray(int length, Handle *handles); 280 jthread * new_jthreadArray(int length, Handle *handles); 281 jthreadGroup * new_jthreadGroupArray(int length, Handle *handles); 282 283 // convert to a jni jclass from a non-null Klass* 284 jclass get_jni_class_non_null(Klass* k); 285 286 jint count_locked_objects(JavaThread *java_thread, Handle hobj); 287 jvmtiError get_locked_objects_in_frame(JavaThread *calling_thread, 288 JavaThread* java_thread, 289 javaVFrame *jvf, 290 GrowableArray<jvmtiMonitorStackDepthInfo*>* owned_monitors_list, 291 jint depth); 292 vframe* vframeFor(JavaThread* java_thread, jint depth); 293 294 public: 295 // get a field descriptor for the specified class and field 296 static bool get_field_descriptor(Klass* k, jfieldID field, fieldDescriptor* fd); 297 298 // JVMTI API helper functions which are called at safepoint or thread is suspended. 299 jvmtiError get_frame_count(JvmtiThreadState *state, jint *count_ptr); 300 jvmtiError get_frame_location(JavaThread* java_thread, jint depth, 301 jmethodID* method_ptr, jlocation* location_ptr); 302 jvmtiError get_object_monitor_usage(JavaThread *calling_thread, 303 jobject object, jvmtiMonitorUsage* info_ptr); 304 jvmtiError get_stack_trace(JavaThread *java_thread, 305 jint stack_depth, jint max_count, 306 jvmtiFrameInfo* frame_buffer, jint* count_ptr); 307 jvmtiError get_current_contended_monitor(JavaThread *calling_thread, 308 JavaThread *java_thread, 309 jobject *monitor_ptr); 310 jvmtiError get_owned_monitors(JavaThread *calling_thread, JavaThread* java_thread, 311 GrowableArray<jvmtiMonitorStackDepthInfo*> *owned_monitors_list); 312 jvmtiError check_top_frame(JavaThread* current_thread, JavaThread* java_thread, 313 jvalue value, TosState tos, Handle* ret_ob_h); 314 jvmtiError force_early_return(JavaThread* java_thread, jvalue value, TosState tos); 315 }; 316 317 // This class is the only safe means of iterating through environments. 318 // Note that this iteratation includes invalid environments pending 319 // deallocation -- in fact, some uses depend on this behavior. 320 321 class JvmtiEnvIterator : public StackObj { 322 private: 323 bool _entry_was_marked; 324 public: 325 JvmtiEnvIterator() { 326 if (Threads::number_of_threads() == 0) { 327 _entry_was_marked = false; // we are single-threaded, no need 328 } else { 329 Thread::current()->entering_jvmti_env_iteration(); 330 _entry_was_marked = true; 331 } 332 } 333 ~JvmtiEnvIterator() { 334 if (_entry_was_marked) { 335 Thread::current()->leaving_jvmti_env_iteration(); 336 } 337 } 338 JvmtiEnv* first() { return JvmtiEnvBase::head_environment(); } 339 JvmtiEnv* next(JvmtiEnvBase* env) { return env->next_environment(); } 340 }; 341 342 // VM operation to update for pop top frame. 343 class VM_UpdateForPopTopFrame : public VM_Operation { 344 private: 345 JvmtiThreadState* _state; 346 jvmtiError _result; 347 348 public: 349 VM_UpdateForPopTopFrame(JvmtiThreadState* state) { 350 _state = state; 351 _result = JVMTI_ERROR_NONE; 352 } 353 VMOp_Type type() const { return VMOp_UpdateForPopTopFrame; } 354 jvmtiError result() { return _result; } 355 void doit(); 356 }; 357 358 // VM operation to set frame pop. 359 class VM_SetFramePop : public VM_Operation { 360 private: 361 JvmtiEnv *_env; 362 JvmtiThreadState* _state; 363 jint _depth; 364 jvmtiError _result; 365 366 public: 367 VM_SetFramePop(JvmtiEnv *env, JvmtiThreadState* state, jint depth) { 368 _env = env; 369 _state = state; 370 _depth = depth; 371 _result = JVMTI_ERROR_NONE; 372 } 373 // Nested operation must be allowed for the VM_EnterInterpOnlyMode that is 374 // called from the JvmtiEventControllerPrivate::recompute_thread_enabled. 375 bool allow_nested_vm_operations() const { return true; } 376 VMOp_Type type() const { return VMOp_SetFramePop; } 377 jvmtiError result() { return _result; } 378 void doit(); 379 }; 380 381 382 // VM operation to get monitor information with stack depth. 383 class VM_GetOwnedMonitorInfo : public VM_Operation { 384 private: 385 JvmtiEnv *_env; 386 JavaThread* _calling_thread; 387 JavaThread *_java_thread; 388 jvmtiError _result; 389 GrowableArray<jvmtiMonitorStackDepthInfo*> *_owned_monitors_list; 390 391 public: 392 VM_GetOwnedMonitorInfo(JvmtiEnv* env, JavaThread* calling_thread, 393 JavaThread* java_thread, 394 GrowableArray<jvmtiMonitorStackDepthInfo*>* owned_monitor_list) { 395 _env = env; 396 _calling_thread = calling_thread; 397 _java_thread = java_thread; 398 _owned_monitors_list = owned_monitor_list; 399 _result = JVMTI_ERROR_NONE; 400 } 401 VMOp_Type type() const { return VMOp_GetOwnedMonitorInfo; } 402 void doit(); 403 jvmtiError result() { return _result; } 404 }; 405 406 407 // VM operation to get object monitor usage. 408 class VM_GetObjectMonitorUsage : public VM_Operation { 409 private: 410 JvmtiEnv *_env; 411 jobject _object; 412 JavaThread* _calling_thread; 413 jvmtiMonitorUsage* _info_ptr; 414 jvmtiError _result; 415 416 public: 417 VM_GetObjectMonitorUsage(JvmtiEnv *env, JavaThread* calling_thread, jobject object, jvmtiMonitorUsage* info_ptr) { 418 _env = env; 419 _object = object; 420 _calling_thread = calling_thread; 421 _info_ptr = info_ptr; 422 } 423 VMOp_Type type() const { return VMOp_GetObjectMonitorUsage; } 424 jvmtiError result() { return _result; } 425 void doit() { 426 _result = ((JvmtiEnvBase*) _env)->get_object_monitor_usage(_calling_thread, _object, _info_ptr); 427 } 428 429 }; 430 431 // VM operation to get current contended monitor. 432 class VM_GetCurrentContendedMonitor : public VM_Operation { 433 private: 434 JvmtiEnv *_env; 435 JavaThread *_calling_thread; 436 JavaThread *_java_thread; 437 jobject *_owned_monitor_ptr; 438 jvmtiError _result; 439 440 public: 441 VM_GetCurrentContendedMonitor(JvmtiEnv *env, JavaThread *calling_thread, JavaThread *java_thread, jobject *mon_ptr) { 442 _env = env; 443 _calling_thread = calling_thread; 444 _java_thread = java_thread; 445 _owned_monitor_ptr = mon_ptr; 446 } 447 VMOp_Type type() const { return VMOp_GetCurrentContendedMonitor; } 448 jvmtiError result() { return _result; } 449 void doit(); 450 }; 451 452 // VM operation to get stack trace at safepoint. 453 class VM_GetStackTrace : public VM_Operation { 454 private: 455 JvmtiEnv *_env; 456 JavaThread *_java_thread; 457 jint _start_depth; 458 jint _max_count; 459 jvmtiFrameInfo *_frame_buffer; 460 jint *_count_ptr; 461 jvmtiError _result; 462 463 public: 464 VM_GetStackTrace(JvmtiEnv *env, JavaThread *java_thread, 465 jint start_depth, jint max_count, 466 jvmtiFrameInfo* frame_buffer, jint* count_ptr) { 467 _env = env; 468 _java_thread = java_thread; 469 _start_depth = start_depth; 470 _max_count = max_count; 471 _frame_buffer = frame_buffer; 472 _count_ptr = count_ptr; 473 } 474 jvmtiError result() { return _result; } 475 VMOp_Type type() const { return VMOp_GetStackTrace; } 476 void doit(); 477 }; 478 479 // forward declaration 480 struct StackInfoNode; 481 482 // VM operation to get stack trace at safepoint. 483 class VM_GetMultipleStackTraces : public VM_Operation { 484 private: 485 JvmtiEnv *_env; 486 jint _max_frame_count; 487 jvmtiStackInfo *_stack_info; 488 jvmtiError _result; 489 int _frame_count_total; 490 struct StackInfoNode *_head; 491 492 JvmtiEnvBase *env() { return (JvmtiEnvBase *)_env; } 493 jint max_frame_count() { return _max_frame_count; } 494 struct StackInfoNode *head() { return _head; } 495 void set_head(StackInfoNode *head) { _head = head; } 496 497 protected: 498 void set_result(jvmtiError result) { _result = result; } 499 void fill_frames(jthread jt, JavaThread *thr, oop thread_oop); 500 void allocate_and_fill_stacks(jint thread_count); 501 502 public: 503 VM_GetMultipleStackTraces(JvmtiEnv *env, jint max_frame_count) { 504 _env = env; 505 _max_frame_count = max_frame_count; 506 _frame_count_total = 0; 507 _head = NULL; 508 _result = JVMTI_ERROR_NONE; 509 } 510 VMOp_Type type() const { return VMOp_GetMultipleStackTraces; } 511 jvmtiStackInfo *stack_info() { return _stack_info; } 512 jvmtiError result() { return _result; } 513 }; 514 515 516 // VM operation to get stack trace at safepoint. 517 class VM_GetAllStackTraces : public VM_GetMultipleStackTraces { 518 private: 519 JavaThread *_calling_thread; 520 jint _final_thread_count; 521 522 public: 523 VM_GetAllStackTraces(JvmtiEnv *env, JavaThread *calling_thread, 524 jint max_frame_count) 525 : VM_GetMultipleStackTraces(env, max_frame_count) { 526 _calling_thread = calling_thread; 527 } 528 VMOp_Type type() const { return VMOp_GetAllStackTraces; } 529 void doit(); 530 jint final_thread_count() { return _final_thread_count; } 531 }; 532 533 // VM operation to get stack trace at safepoint. 534 class VM_GetThreadListStackTraces : public VM_GetMultipleStackTraces { 535 private: 536 jint _thread_count; 537 const jthread* _thread_list; 538 539 public: 540 VM_GetThreadListStackTraces(JvmtiEnv *env, jint thread_count, const jthread* thread_list, jint max_frame_count) 541 : VM_GetMultipleStackTraces(env, max_frame_count) { 542 _thread_count = thread_count; 543 _thread_list = thread_list; 544 } 545 VMOp_Type type() const { return VMOp_GetThreadListStackTraces; } 546 void doit(); 547 }; 548 549 550 // VM operation to count stack frames at safepoint. 551 class VM_GetFrameCount : public VM_Operation { 552 private: 553 JvmtiEnv *_env; 554 JvmtiThreadState *_state; 555 jint *_count_ptr; 556 jvmtiError _result; 557 558 public: 559 VM_GetFrameCount(JvmtiEnv *env, JvmtiThreadState *state, jint *count_ptr) { 560 _env = env; 561 _state = state; 562 _count_ptr = count_ptr; 563 } 564 VMOp_Type type() const { return VMOp_GetFrameCount; } 565 jvmtiError result() { return _result; } 566 void doit(); 567 }; 568 569 // VM operation to frame location at safepoint. 570 class VM_GetFrameLocation : public VM_Operation { 571 private: 572 JvmtiEnv *_env; 573 JavaThread* _java_thread; 574 jint _depth; 575 jmethodID* _method_ptr; 576 jlocation* _location_ptr; 577 jvmtiError _result; 578 579 public: 580 VM_GetFrameLocation(JvmtiEnv *env, JavaThread* java_thread, jint depth, 581 jmethodID* method_ptr, jlocation* location_ptr) { 582 _env = env; 583 _java_thread = java_thread; 584 _depth = depth; 585 _method_ptr = method_ptr; 586 _location_ptr = location_ptr; 587 } 588 VMOp_Type type() const { return VMOp_GetFrameLocation; } 589 jvmtiError result() { return _result; } 590 void doit(); 591 }; 592 593 594 // ResourceTracker 595 // 596 // ResourceTracker works a little like a ResourceMark. All allocates 597 // using the resource tracker are recorded. If an allocate using the 598 // resource tracker fails the destructor will free any resources 599 // that were allocated using the tracker. 600 // The motive for this class is to avoid messy error recovery code 601 // in situations where multiple allocations are done in sequence. If 602 // the second or subsequent allocation fails it avoids any code to 603 // release memory allocated in the previous calls. 604 // 605 // Usage :- 606 // ResourceTracker rt(env); 607 // : 608 // err = rt.allocate(1024, &ptr); 609 610 class ResourceTracker : public StackObj { 611 private: 612 JvmtiEnv* _env; 613 GrowableArray<unsigned char*> *_allocations; 614 bool _failed; 615 public: 616 ResourceTracker(JvmtiEnv* env); 617 ~ResourceTracker(); 618 jvmtiError allocate(jlong size, unsigned char** mem_ptr); 619 unsigned char* allocate(jlong size); 620 char* strdup(const char* str); 621 }; 622 623 624 // Jvmti monitor closure to collect off stack monitors. 625 class JvmtiMonitorClosure: public MonitorClosure { 626 private: 627 JavaThread *_java_thread; 628 JavaThread *_calling_thread; 629 GrowableArray<jvmtiMonitorStackDepthInfo*> *_owned_monitors_list; 630 jvmtiError _error; 631 JvmtiEnvBase *_env; 632 633 public: 634 JvmtiMonitorClosure(JavaThread* thread, JavaThread *calling_thread, 635 GrowableArray<jvmtiMonitorStackDepthInfo*> *owned_monitors, 636 JvmtiEnvBase *env) { 637 _java_thread = thread; 638 _calling_thread = calling_thread; 639 _owned_monitors_list = owned_monitors; 640 _error = JVMTI_ERROR_NONE; 641 _env = env; 642 } 643 void do_monitor(ObjectMonitor* mon); 644 jvmtiError error() { return _error;} 645 }; 646 647 648 // Jvmti module closure to collect all modules loaded to the system. 649 class JvmtiModuleClosure : public StackObj { 650 private: 651 static GrowableArray<OopHandle> *_tbl; // Protected with Module_lock 652 653 static void do_module(ModuleEntry* entry) { 654 assert_locked_or_safepoint(Module_lock); 655 OopHandle module = entry->module_handle(); 656 guarantee(module.resolve() != NULL, "module object is NULL"); 657 _tbl->push(module); 658 } 659 660 public: 661 jvmtiError get_all_modules(JvmtiEnv* env, jint* module_count_ptr, jobject** modules_ptr); 662 }; 663 664 #endif // SHARE_VM_PRIMS_JVMTIENVBASE_HPP