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 from JNIHandle to JavaThread * 284 JavaThread * get_JavaThread(jthread jni_thread); 285 286 // convert to a jni jclass from a non-null Klass* 287 jclass get_jni_class_non_null(Klass* k); 288 289 jint count_locked_objects(JavaThread *java_thread, Handle hobj); 290 jvmtiError get_locked_objects_in_frame(JavaThread *calling_thread, 291 JavaThread* java_thread, 292 javaVFrame *jvf, 293 GrowableArray<jvmtiMonitorStackDepthInfo*>* owned_monitors_list, 294 jint depth); 295 vframe* vframeFor(JavaThread* java_thread, jint depth); 296 297 public: 298 // get a field descriptor for the specified class and field 299 static bool get_field_descriptor(Klass* k, jfieldID field, fieldDescriptor* fd); 300 // test for suspend - most (all?) of these should go away 301 static bool is_thread_fully_suspended(JavaThread *thread, 302 bool wait_for_suspend, 303 uint32_t *bits); 304 305 306 // JVMTI API helper functions which are called at safepoint or thread is suspended. 307 jvmtiError get_frame_count(JvmtiThreadState *state, jint *count_ptr); 308 jvmtiError get_frame_location(JavaThread* java_thread, jint depth, 309 jmethodID* method_ptr, jlocation* location_ptr); 310 jvmtiError get_object_monitor_usage(JavaThread *calling_thread, 311 jobject object, jvmtiMonitorUsage* info_ptr); 312 jvmtiError get_stack_trace(JavaThread *java_thread, 313 jint stack_depth, jint max_count, 314 jvmtiFrameInfo* frame_buffer, jint* count_ptr); 315 jvmtiError get_current_contended_monitor(JavaThread *calling_thread, 316 JavaThread *java_thread, 317 jobject *monitor_ptr); 318 jvmtiError get_owned_monitors(JavaThread *calling_thread, JavaThread* java_thread, 319 GrowableArray<jvmtiMonitorStackDepthInfo*> *owned_monitors_list); 320 jvmtiError check_top_frame(JavaThread* current_thread, JavaThread* java_thread, 321 jvalue value, TosState tos, Handle* ret_ob_h); 322 jvmtiError force_early_return(JavaThread* java_thread, jvalue value, TosState tos); 323 }; 324 325 // This class is the only safe means of iterating through environments. 326 // Note that this iteratation includes invalid environments pending 327 // deallocation -- in fact, some uses depend on this behavior. 328 329 class JvmtiEnvIterator : public StackObj { 330 private: 331 bool _entry_was_marked; 332 public: 333 JvmtiEnvIterator() { 334 if (Threads::number_of_threads() == 0) { 335 _entry_was_marked = false; // we are single-threaded, no need 336 } else { 337 Thread::current()->entering_jvmti_env_iteration(); 338 _entry_was_marked = true; 339 } 340 } 341 ~JvmtiEnvIterator() { 342 if (_entry_was_marked) { 343 Thread::current()->leaving_jvmti_env_iteration(); 344 } 345 } 346 JvmtiEnv* first() { return JvmtiEnvBase::head_environment(); } 347 JvmtiEnv* next(JvmtiEnvBase* env) { return env->next_environment(); } 348 }; 349 350 // VM operation to update for pop top frame. 351 class VM_UpdateForPopTopFrame : public VM_Operation { 352 private: 353 JvmtiThreadState* _state; 354 jvmtiError _result; 355 356 public: 357 VM_UpdateForPopTopFrame(JvmtiThreadState* state) { 358 _state = state; 359 _result = JVMTI_ERROR_NONE; 360 } 361 VMOp_Type type() const { return VMOp_UpdateForPopTopFrame; } 362 jvmtiError result() { return _result; } 363 void doit() { 364 JavaThread* jt = _state->get_thread(); 365 if (Threads::includes(jt) && !jt->is_exiting() && jt->threadObj() != NULL) { 366 _state->update_for_pop_top_frame(); 367 } else { 368 _result = JVMTI_ERROR_THREAD_NOT_ALIVE; 369 } 370 } 371 }; 372 373 // VM operation to set frame pop. 374 class VM_SetFramePop : public VM_Operation { 375 private: 376 JvmtiEnv *_env; 377 JvmtiThreadState* _state; 378 jint _depth; 379 jvmtiError _result; 380 381 public: 382 VM_SetFramePop(JvmtiEnv *env, JvmtiThreadState* state, jint depth) { 383 _env = env; 384 _state = state; 385 _depth = depth; 386 _result = JVMTI_ERROR_NONE; 387 } 388 // Nested operation must be allowed for the VM_EnterInterpOnlyMode that is 389 // called from the JvmtiEventControllerPrivate::recompute_thread_enabled. 390 bool allow_nested_vm_operations() const { return true; } 391 VMOp_Type type() const { return VMOp_SetFramePop; } 392 jvmtiError result() { return _result; } 393 void doit() { 394 JavaThread* jt = _state->get_thread(); 395 if (Threads::includes(jt) && !jt->is_exiting() && jt->threadObj() != NULL) { 396 int frame_number = _state->count_frames() - _depth; 397 _state->env_thread_state((JvmtiEnvBase*)_env)->set_frame_pop(frame_number); 398 } else { 399 _result = JVMTI_ERROR_THREAD_NOT_ALIVE; 400 } 401 } 402 }; 403 404 405 // VM operation to get monitor information with stack depth. 406 class VM_GetOwnedMonitorInfo : public VM_Operation { 407 private: 408 JvmtiEnv *_env; 409 JavaThread* _calling_thread; 410 JavaThread *_java_thread; 411 jvmtiError _result; 412 GrowableArray<jvmtiMonitorStackDepthInfo*> *_owned_monitors_list; 413 414 public: 415 VM_GetOwnedMonitorInfo(JvmtiEnv* env, JavaThread* calling_thread, 416 JavaThread* java_thread, 417 GrowableArray<jvmtiMonitorStackDepthInfo*>* owned_monitor_list) { 418 _env = env; 419 _calling_thread = calling_thread; 420 _java_thread = java_thread; 421 _owned_monitors_list = owned_monitor_list; 422 _result = JVMTI_ERROR_NONE; 423 } 424 VMOp_Type type() const { return VMOp_GetOwnedMonitorInfo; } 425 void doit() { 426 _result = JVMTI_ERROR_THREAD_NOT_ALIVE; 427 if (Threads::includes(_java_thread) && !_java_thread->is_exiting() 428 && _java_thread->threadObj() != NULL) { 429 _result = ((JvmtiEnvBase *)_env)->get_owned_monitors(_calling_thread, _java_thread, 430 _owned_monitors_list); 431 } 432 } 433 jvmtiError result() { return _result; } 434 }; 435 436 437 // VM operation to get object monitor usage. 438 class VM_GetObjectMonitorUsage : public VM_Operation { 439 private: 440 JvmtiEnv *_env; 441 jobject _object; 442 JavaThread* _calling_thread; 443 jvmtiMonitorUsage* _info_ptr; 444 jvmtiError _result; 445 446 public: 447 VM_GetObjectMonitorUsage(JvmtiEnv *env, JavaThread* calling_thread, jobject object, jvmtiMonitorUsage* info_ptr) { 448 _env = env; 449 _object = object; 450 _calling_thread = calling_thread; 451 _info_ptr = info_ptr; 452 } 453 VMOp_Type type() const { return VMOp_GetObjectMonitorUsage; } 454 jvmtiError result() { return _result; } 455 void doit() { 456 _result = ((JvmtiEnvBase*) _env)->get_object_monitor_usage(_calling_thread, _object, _info_ptr); 457 } 458 459 }; 460 461 // VM operation to get current contended monitor. 462 class VM_GetCurrentContendedMonitor : public VM_Operation { 463 private: 464 JvmtiEnv *_env; 465 JavaThread *_calling_thread; 466 JavaThread *_java_thread; 467 jobject *_owned_monitor_ptr; 468 jvmtiError _result; 469 470 public: 471 VM_GetCurrentContendedMonitor(JvmtiEnv *env, JavaThread *calling_thread, JavaThread *java_thread, jobject *mon_ptr) { 472 _env = env; 473 _calling_thread = calling_thread; 474 _java_thread = java_thread; 475 _owned_monitor_ptr = mon_ptr; 476 } 477 VMOp_Type type() const { return VMOp_GetCurrentContendedMonitor; } 478 jvmtiError result() { return _result; } 479 void doit() { 480 _result = JVMTI_ERROR_THREAD_NOT_ALIVE; 481 if (Threads::includes(_java_thread) && !_java_thread->is_exiting() && 482 _java_thread->threadObj() != NULL) { 483 _result = ((JvmtiEnvBase *)_env)->get_current_contended_monitor(_calling_thread,_java_thread,_owned_monitor_ptr); 484 } 485 } 486 }; 487 488 // VM operation to get stack trace at safepoint. 489 class VM_GetStackTrace : public VM_Operation { 490 private: 491 JvmtiEnv *_env; 492 JavaThread *_java_thread; 493 jint _start_depth; 494 jint _max_count; 495 jvmtiFrameInfo *_frame_buffer; 496 jint *_count_ptr; 497 jvmtiError _result; 498 499 public: 500 VM_GetStackTrace(JvmtiEnv *env, JavaThread *java_thread, 501 jint start_depth, jint max_count, 502 jvmtiFrameInfo* frame_buffer, jint* count_ptr) { 503 _env = env; 504 _java_thread = java_thread; 505 _start_depth = start_depth; 506 _max_count = max_count; 507 _frame_buffer = frame_buffer; 508 _count_ptr = count_ptr; 509 } 510 jvmtiError result() { return _result; } 511 VMOp_Type type() const { return VMOp_GetStackTrace; } 512 void doit() { 513 _result = JVMTI_ERROR_THREAD_NOT_ALIVE; 514 if (Threads::includes(_java_thread) && !_java_thread->is_exiting() 515 && _java_thread->threadObj() != NULL) { 516 _result = ((JvmtiEnvBase *)_env)->get_stack_trace(_java_thread, 517 _start_depth, _max_count, 518 _frame_buffer, _count_ptr); 519 } 520 } 521 }; 522 523 // forward declaration 524 struct StackInfoNode; 525 526 // VM operation to get stack trace at safepoint. 527 class VM_GetMultipleStackTraces : public VM_Operation { 528 private: 529 JvmtiEnv *_env; 530 jint _max_frame_count; 531 jvmtiStackInfo *_stack_info; 532 jvmtiError _result; 533 int _frame_count_total; 534 struct StackInfoNode *_head; 535 536 JvmtiEnvBase *env() { return (JvmtiEnvBase *)_env; } 537 jint max_frame_count() { return _max_frame_count; } 538 struct StackInfoNode *head() { return _head; } 539 void set_head(StackInfoNode *head) { _head = head; } 540 541 protected: 542 void set_result(jvmtiError result) { _result = result; } 543 void fill_frames(jthread jt, JavaThread *thr, oop thread_oop); 544 void allocate_and_fill_stacks(jint thread_count); 545 546 public: 547 VM_GetMultipleStackTraces(JvmtiEnv *env, jint max_frame_count) { 548 _env = env; 549 _max_frame_count = max_frame_count; 550 _frame_count_total = 0; 551 _head = NULL; 552 _result = JVMTI_ERROR_NONE; 553 } 554 VMOp_Type type() const { return VMOp_GetMultipleStackTraces; } 555 jvmtiStackInfo *stack_info() { return _stack_info; } 556 jvmtiError result() { return _result; } 557 }; 558 559 560 // VM operation to get stack trace at safepoint. 561 class VM_GetAllStackTraces : public VM_GetMultipleStackTraces { 562 private: 563 JavaThread *_calling_thread; 564 jint _final_thread_count; 565 566 public: 567 VM_GetAllStackTraces(JvmtiEnv *env, JavaThread *calling_thread, 568 jint max_frame_count) 569 : VM_GetMultipleStackTraces(env, max_frame_count) { 570 _calling_thread = calling_thread; 571 } 572 VMOp_Type type() const { return VMOp_GetAllStackTraces; } 573 void doit(); 574 jint final_thread_count() { return _final_thread_count; } 575 }; 576 577 // VM operation to get stack trace at safepoint. 578 class VM_GetThreadListStackTraces : public VM_GetMultipleStackTraces { 579 private: 580 jint _thread_count; 581 const jthread* _thread_list; 582 583 public: 584 VM_GetThreadListStackTraces(JvmtiEnv *env, jint thread_count, const jthread* thread_list, jint max_frame_count) 585 : VM_GetMultipleStackTraces(env, max_frame_count) { 586 _thread_count = thread_count; 587 _thread_list = thread_list; 588 } 589 VMOp_Type type() const { return VMOp_GetThreadListStackTraces; } 590 void doit(); 591 }; 592 593 594 // VM operation to count stack frames at safepoint. 595 class VM_GetFrameCount : public VM_Operation { 596 private: 597 JvmtiEnv *_env; 598 JvmtiThreadState *_state; 599 jint *_count_ptr; 600 jvmtiError _result; 601 602 public: 603 VM_GetFrameCount(JvmtiEnv *env, JvmtiThreadState *state, jint *count_ptr) { 604 _env = env; 605 _state = state; 606 _count_ptr = count_ptr; 607 } 608 VMOp_Type type() const { return VMOp_GetFrameCount; } 609 jvmtiError result() { return _result; } 610 void doit() { 611 _result = JVMTI_ERROR_THREAD_NOT_ALIVE; 612 JavaThread* jt = _state->get_thread(); 613 if (Threads::includes(jt) && !jt->is_exiting() && jt->threadObj() != NULL) { 614 _result = ((JvmtiEnvBase*)_env)->get_frame_count(_state, _count_ptr); 615 } 616 } 617 }; 618 619 // VM operation to frame location at safepoint. 620 class VM_GetFrameLocation : public VM_Operation { 621 private: 622 JvmtiEnv *_env; 623 JavaThread* _java_thread; 624 jint _depth; 625 jmethodID* _method_ptr; 626 jlocation* _location_ptr; 627 jvmtiError _result; 628 629 public: 630 VM_GetFrameLocation(JvmtiEnv *env, JavaThread* java_thread, jint depth, 631 jmethodID* method_ptr, jlocation* location_ptr) { 632 _env = env; 633 _java_thread = java_thread; 634 _depth = depth; 635 _method_ptr = method_ptr; 636 _location_ptr = location_ptr; 637 } 638 VMOp_Type type() const { return VMOp_GetFrameLocation; } 639 jvmtiError result() { return _result; } 640 void doit() { 641 _result = JVMTI_ERROR_THREAD_NOT_ALIVE; 642 if (Threads::includes(_java_thread) && !_java_thread->is_exiting() && 643 _java_thread->threadObj() != NULL) { 644 _result = ((JvmtiEnvBase*)_env)->get_frame_location(_java_thread, _depth, 645 _method_ptr, _location_ptr); 646 } 647 } 648 }; 649 650 651 // ResourceTracker 652 // 653 // ResourceTracker works a little like a ResourceMark. All allocates 654 // using the resource tracker are recorded. If an allocate using the 655 // resource tracker fails the destructor will free any resources 656 // that were allocated using the tracker. 657 // The motive for this class is to avoid messy error recovery code 658 // in situations where multiple allocations are done in sequence. If 659 // the second or subsequent allocation fails it avoids any code to 660 // release memory allocated in the previous calls. 661 // 662 // Usage :- 663 // ResourceTracker rt(env); 664 // : 665 // err = rt.allocate(1024, &ptr); 666 667 class ResourceTracker : public StackObj { 668 private: 669 JvmtiEnv* _env; 670 GrowableArray<unsigned char*> *_allocations; 671 bool _failed; 672 public: 673 ResourceTracker(JvmtiEnv* env); 674 ~ResourceTracker(); 675 jvmtiError allocate(jlong size, unsigned char** mem_ptr); 676 unsigned char* allocate(jlong size); 677 char* strdup(const char* str); 678 }; 679 680 681 // Jvmti monitor closure to collect off stack monitors. 682 class JvmtiMonitorClosure: public MonitorClosure { 683 private: 684 JavaThread *_java_thread; 685 JavaThread *_calling_thread; 686 GrowableArray<jvmtiMonitorStackDepthInfo*> *_owned_monitors_list; 687 jvmtiError _error; 688 JvmtiEnvBase *_env; 689 690 public: 691 JvmtiMonitorClosure(JavaThread* thread, JavaThread *calling_thread, 692 GrowableArray<jvmtiMonitorStackDepthInfo*> *owned_monitors, 693 JvmtiEnvBase *env) { 694 _java_thread = thread; 695 _calling_thread = calling_thread; 696 _owned_monitors_list = owned_monitors; 697 _error = JVMTI_ERROR_NONE; 698 _env = env; 699 } 700 void do_monitor(ObjectMonitor* mon); 701 jvmtiError error() { return _error;} 702 }; 703 704 705 // Jvmti module closure to collect all modules loaded to the system. 706 class JvmtiModuleClosure : public StackObj { 707 private: 708 static GrowableArray<OopHandle> *_tbl; // Protected with Module_lock 709 710 static void do_module(ModuleEntry* entry) { 711 assert_locked_or_safepoint(Module_lock); 712 OopHandle module = entry->module_handle(); 713 guarantee(module.resolve() != NULL, "module object is NULL"); 714 _tbl->push(module); 715 } 716 717 public: 718 jvmtiError get_all_modules(JvmtiEnv* env, jint* module_count_ptr, jobject** modules_ptr); 719 }; 720 721 #endif // SHARE_VM_PRIMS_JVMTIENVBASE_HPP