1 /* 2 * Copyright (c) 1998, 2020, 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_PRIMS_JVMTIEXPORT_HPP 26 #define SHARE_PRIMS_JVMTIEXPORT_HPP 27 28 #include "jvmtifiles/jvmti.h" 29 #include "memory/allocation.hpp" 30 #include "memory/iterator.hpp" 31 #include "oops/oop.hpp" 32 #include "oops/oopHandle.hpp" 33 #include "oops/oopsHierarchy.hpp" 34 #include "runtime/frame.hpp" 35 #include "runtime/handles.hpp" 36 #include "utilities/globalDefinitions.hpp" 37 #include "utilities/growableArray.hpp" 38 #include "utilities/macros.hpp" 39 40 // Must be included after jvmti.h. 41 #include "jvmticmlr.h" 42 43 // Forward declarations 44 45 class JvmtiEventControllerPrivate; 46 class JvmtiManageCapabilities; 47 class JvmtiEnv; 48 class JvmtiThreadState; 49 50 class OopStorage; 51 52 #define JVMTI_SUPPORT_FLAG(key) \ 53 private: \ 54 static bool _##key; \ 55 public: \ 56 inline static void set_##key(bool on) { \ 57 JVMTI_ONLY(_##key = (on != 0)); \ 58 NOT_JVMTI(report_unsupported(on)); \ 59 } \ 60 inline static bool key() { \ 61 JVMTI_ONLY(return _##key); \ 62 NOT_JVMTI(return false); \ 63 } 64 65 66 // This class contains the JVMTI interface for the rest of hotspot. 67 // 68 class JvmtiExport : public AllStatic { 69 friend class VMStructs; 70 friend class CompileReplay; 71 72 private: 73 74 #if INCLUDE_JVMTI 75 static int _field_access_count; 76 static int _field_modification_count; 77 78 static bool _can_access_local_variables; 79 static bool _can_hotswap_or_post_breakpoint; 80 static bool _can_modify_any_class; 81 static bool _can_walk_any_space; 82 #endif // INCLUDE_JVMTI 83 84 JVMTI_SUPPORT_FLAG(can_get_source_debug_extension) 85 JVMTI_SUPPORT_FLAG(can_maintain_original_method_order) 86 JVMTI_SUPPORT_FLAG(can_post_interpreter_events) 87 JVMTI_SUPPORT_FLAG(can_post_on_exceptions) 88 JVMTI_SUPPORT_FLAG(can_post_breakpoint) 89 JVMTI_SUPPORT_FLAG(can_post_field_access) 90 JVMTI_SUPPORT_FLAG(can_post_field_modification) 91 JVMTI_SUPPORT_FLAG(can_post_method_entry) 92 JVMTI_SUPPORT_FLAG(can_post_method_exit) 93 JVMTI_SUPPORT_FLAG(can_pop_frame) 94 JVMTI_SUPPORT_FLAG(can_force_early_return) 95 96 JVMTI_SUPPORT_FLAG(early_vmstart_recorded) 97 JVMTI_SUPPORT_FLAG(can_get_owned_monitor_info) // includes can_get_owned_monitor_stack_depth_info 98 99 friend class JvmtiEventControllerPrivate; // should only modify these flags 100 JVMTI_SUPPORT_FLAG(should_post_single_step) 101 JVMTI_SUPPORT_FLAG(should_post_field_access) 102 JVMTI_SUPPORT_FLAG(should_post_field_modification) 103 JVMTI_SUPPORT_FLAG(should_post_class_load) 104 JVMTI_SUPPORT_FLAG(should_post_class_prepare) 105 JVMTI_SUPPORT_FLAG(should_post_class_unload) 106 JVMTI_SUPPORT_FLAG(should_post_native_method_bind) 107 JVMTI_SUPPORT_FLAG(should_post_compiled_method_load) 108 JVMTI_SUPPORT_FLAG(should_post_compiled_method_unload) 109 JVMTI_SUPPORT_FLAG(should_post_dynamic_code_generated) 110 JVMTI_SUPPORT_FLAG(should_post_monitor_contended_enter) 111 JVMTI_SUPPORT_FLAG(should_post_monitor_contended_entered) 112 JVMTI_SUPPORT_FLAG(should_post_monitor_wait) 113 JVMTI_SUPPORT_FLAG(should_post_monitor_waited) 114 JVMTI_SUPPORT_FLAG(should_post_data_dump) 115 JVMTI_SUPPORT_FLAG(should_post_garbage_collection_start) 116 JVMTI_SUPPORT_FLAG(should_post_garbage_collection_finish) 117 JVMTI_SUPPORT_FLAG(should_post_on_exceptions) 118 119 // ------ the below maybe don't have to be (but are for now) 120 // fixed conditions here ------------ 121 // any events can be enabled 122 JVMTI_SUPPORT_FLAG(should_post_thread_life) 123 JVMTI_SUPPORT_FLAG(should_post_object_free) 124 JVMTI_SUPPORT_FLAG(should_post_resource_exhausted) 125 126 // we are holding objects on the heap - need to talk to GC - e.g. 127 // breakpoint info 128 JVMTI_SUPPORT_FLAG(should_clean_up_heap_objects) 129 JVMTI_SUPPORT_FLAG(should_post_vm_object_alloc) 130 JVMTI_SUPPORT_FLAG(should_post_sampled_object_alloc) 131 132 // If flag cannot be implemented, give an error if on=true 133 static void report_unsupported(bool on); 134 135 // these should only be called by the friend class 136 friend class JvmtiManageCapabilities; set_can_modify_any_class(bool on)137 inline static void set_can_modify_any_class(bool on) { 138 JVMTI_ONLY(_can_modify_any_class = (on != 0);) 139 } set_can_access_local_variables(bool on)140 inline static void set_can_access_local_variables(bool on) { 141 JVMTI_ONLY(_can_access_local_variables = (on != 0);) 142 } set_can_hotswap_or_post_breakpoint(bool on)143 inline static void set_can_hotswap_or_post_breakpoint(bool on) { 144 JVMTI_ONLY(_can_hotswap_or_post_breakpoint = (on != 0);) 145 } set_can_walk_any_space(bool on)146 inline static void set_can_walk_any_space(bool on) { 147 JVMTI_ONLY(_can_walk_any_space = (on != 0);) 148 } 149 150 enum { 151 JVMTI_VERSION_MASK = 0x70000000, 152 JVMTI_VERSION_VALUE = 0x30000000, 153 JVMDI_VERSION_VALUE = 0x20000000 154 }; 155 156 static void post_field_modification(JavaThread *thread, Method* method, address location, 157 Klass* field_klass, Handle object, jfieldID field, 158 char sig_type, jvalue *value); 159 160 161 // posts a DynamicCodeGenerated event (internal/private implementation). 162 // The public post_dynamic_code_generated* functions make use of the 163 // internal implementation. Also called from JvmtiDeferredEvent::post() 164 static void post_dynamic_code_generated_internal(const char *name, const void *code_begin, const void *code_end) NOT_JVMTI_RETURN; 165 166 static void post_class_unload_internal(const char *name) NOT_JVMTI_RETURN; 167 168 static void initialize_oop_storage() NOT_JVMTI_RETURN; 169 static OopStorage* jvmti_oop_storage(); 170 static OopStorage* weak_tag_storage(); 171 private: 172 173 // GenerateEvents support to allow posting of CompiledMethodLoad and 174 // DynamicCodeGenerated events for a given environment. 175 friend class JvmtiCodeBlobEvents; 176 177 static void post_dynamic_code_generated(JvmtiEnv* env, const char *name, const void *code_begin, 178 const void *code_end) NOT_JVMTI_RETURN; 179 180 // This flag indicates whether RedefineClasses() has ever redefined 181 // one or more classes during the lifetime of the VM. The flag should 182 // only be set by the friend class and can be queried by other sub 183 // systems as needed to relax invariant checks. 184 static uint64_t _redefinition_count; 185 friend class VM_RedefineClasses; increment_redefinition_count()186 inline static void increment_redefinition_count() { 187 JVMTI_ONLY(_redefinition_count++;) 188 } 189 // Flag to indicate if the compiler has recorded all dependencies. When the 190 // can_redefine_classes capability is enabled in the OnLoad phase then the compiler 191 // records all dependencies from startup. However if the capability is first 192 // enabled some time later then the dependencies recorded by the compiler 193 // are incomplete. This flag is used by RedefineClasses to know if the 194 // dependency information is complete or not. 195 static bool _all_dependencies_are_recorded; 196 197 static void post_method_exit_inner(JavaThread* thread, 198 methodHandle& mh, 199 JvmtiThreadState *state, 200 bool exception_exit, 201 frame current_frame, 202 jvalue& value); 203 204 public: has_redefined_a_class()205 inline static bool has_redefined_a_class() { 206 JVMTI_ONLY(return _redefinition_count != 0); 207 NOT_JVMTI(return false); 208 } 209 210 // Only set in safepoint, so no memory ordering needed. redefinition_count()211 inline static uint64_t redefinition_count() { 212 JVMTI_ONLY(return _redefinition_count); 213 NOT_JVMTI(return 0); 214 } 215 all_dependencies_are_recorded()216 inline static bool all_dependencies_are_recorded() { 217 return _all_dependencies_are_recorded; 218 } 219 set_all_dependencies_are_recorded(bool on)220 inline static void set_all_dependencies_are_recorded(bool on) { 221 _all_dependencies_are_recorded = (on != 0); 222 } 223 224 // Add read edges to the unnamed modules of the bootstrap and app class loaders 225 static void add_default_read_edges(Handle h_module, TRAPS) NOT_JVMTI_RETURN; 226 227 // Add a read edge to the module 228 static jvmtiError add_module_reads(Handle module, Handle to_module, TRAPS); 229 230 // Updates a module to export a package 231 static jvmtiError add_module_exports(Handle module, Handle pkg_name, Handle to_module, TRAPS); 232 233 // Updates a module to open a package 234 static jvmtiError add_module_opens(Handle module, Handle pkg_name, Handle to_module, TRAPS); 235 236 // Add a used service to the module 237 static jvmtiError add_module_uses(Handle module, Handle service, TRAPS); 238 239 // Add a service provider to the module 240 static jvmtiError add_module_provides(Handle module, Handle service, Handle impl_class, TRAPS); 241 242 // let JVMTI know that the JVM_OnLoad code is running 243 static void enter_onload_phase() NOT_JVMTI_RETURN; 244 245 // let JVMTI know that the VM isn't up yet (and JVM_OnLoad code isn't running) 246 static void enter_primordial_phase() NOT_JVMTI_RETURN; 247 248 // let JVMTI know that the VM isn't up yet but JNI is live 249 static void enter_early_start_phase() NOT_JVMTI_RETURN; 250 static void enter_start_phase() NOT_JVMTI_RETURN; 251 252 // let JVMTI know that the VM is fully up and running now 253 static void enter_live_phase() NOT_JVMTI_RETURN; 254 255 // ------ can_* conditions (below) are set at OnLoad and never changed ------------ can_modify_any_class()256 inline static bool can_modify_any_class() { 257 JVMTI_ONLY(return _can_modify_any_class); 258 NOT_JVMTI(return false); 259 } can_access_local_variables()260 inline static bool can_access_local_variables() { 261 JVMTI_ONLY(return _can_access_local_variables); 262 NOT_JVMTI(return false); 263 } can_hotswap_or_post_breakpoint()264 inline static bool can_hotswap_or_post_breakpoint() { 265 JVMTI_ONLY(return _can_hotswap_or_post_breakpoint); 266 NOT_JVMTI(return false); 267 } can_walk_any_space()268 inline static bool can_walk_any_space() { 269 JVMTI_ONLY(return _can_walk_any_space); 270 NOT_JVMTI(return false); 271 } 272 273 // field access management 274 static address get_field_access_count_addr() NOT_JVMTI_RETURN_(0); 275 276 // field modification management 277 static address get_field_modification_count_addr() NOT_JVMTI_RETURN_(0); 278 279 // ----------------- 280 is_jvmti_version(jint version)281 static bool is_jvmti_version(jint version) { 282 JVMTI_ONLY(return (version & JVMTI_VERSION_MASK) == JVMTI_VERSION_VALUE); 283 NOT_JVMTI(return false); 284 } is_jvmdi_version(jint version)285 static bool is_jvmdi_version(jint version) { 286 JVMTI_ONLY(return (version & JVMTI_VERSION_MASK) == JVMDI_VERSION_VALUE); 287 NOT_JVMTI(return false); 288 } 289 static jint get_jvmti_interface(JavaVM *jvm, void **penv, jint version) NOT_JVMTI_RETURN_(0); 290 static void decode_version_values(jint version, int * major, int * minor, 291 int * micro) NOT_JVMTI_RETURN; 292 293 // single stepping management methods 294 static void at_single_stepping_point(JavaThread *thread, Method* method, address location) NOT_JVMTI_RETURN; 295 static void expose_single_stepping(JavaThread *thread) NOT_JVMTI_RETURN; 296 static bool hide_single_stepping(JavaThread *thread) NOT_JVMTI_RETURN_(false); 297 298 // Methods that notify the debugger that something interesting has happened in the VM. 299 static void post_early_vm_start () NOT_JVMTI_RETURN; 300 static void post_vm_start () NOT_JVMTI_RETURN; 301 static void post_vm_initialized () NOT_JVMTI_RETURN; 302 static void post_vm_death () NOT_JVMTI_RETURN; 303 304 static void post_single_step (JavaThread *thread, Method* method, address location) NOT_JVMTI_RETURN; 305 static void post_raw_breakpoint (JavaThread *thread, Method* method, address location) NOT_JVMTI_RETURN; 306 307 static void post_exception_throw (JavaThread *thread, Method* method, address location, oop exception) NOT_JVMTI_RETURN; 308 static void notice_unwind_due_to_exception (JavaThread *thread, Method* method, address location, oop exception, bool in_handler_frame) NOT_JVMTI_RETURN; 309 310 static oop jni_GetField_probe (JavaThread *thread, jobject jobj, 311 oop obj, Klass* klass, jfieldID fieldID, bool is_static) 312 NOT_JVMTI_RETURN_(NULL); 313 static oop jni_GetField_probe_nh (JavaThread *thread, jobject jobj, 314 oop obj, Klass* klass, jfieldID fieldID, bool is_static) 315 NOT_JVMTI_RETURN_(NULL); 316 static void post_field_access_by_jni (JavaThread *thread, oop obj, 317 Klass* klass, jfieldID fieldID, bool is_static) NOT_JVMTI_RETURN; 318 static void post_field_access (JavaThread *thread, Method* method, 319 address location, Klass* field_klass, Handle object, jfieldID field) NOT_JVMTI_RETURN; 320 static oop jni_SetField_probe (JavaThread *thread, jobject jobj, 321 oop obj, Klass* klass, jfieldID fieldID, bool is_static, char sig_type, 322 jvalue *value) NOT_JVMTI_RETURN_(NULL); 323 static oop jni_SetField_probe_nh (JavaThread *thread, jobject jobj, 324 oop obj, Klass* klass, jfieldID fieldID, bool is_static, char sig_type, 325 jvalue *value) NOT_JVMTI_RETURN_(NULL); 326 static void post_field_modification_by_jni(JavaThread *thread, oop obj, 327 Klass* klass, jfieldID fieldID, bool is_static, char sig_type, 328 jvalue *value); 329 static void post_raw_field_modification(JavaThread *thread, Method* method, 330 address location, Klass* field_klass, Handle object, jfieldID field, 331 char sig_type, jvalue *value) NOT_JVMTI_RETURN; 332 333 static void post_method_entry (JavaThread *thread, Method* method, frame current_frame) NOT_JVMTI_RETURN; 334 static void post_method_exit (JavaThread *thread, Method* method, frame current_frame) NOT_JVMTI_RETURN; 335 336 static void post_class_load (JavaThread *thread, Klass* klass) NOT_JVMTI_RETURN; 337 static void post_class_unload (Klass* klass) NOT_JVMTI_RETURN; 338 static void post_class_prepare (JavaThread *thread, Klass* klass) NOT_JVMTI_RETURN; 339 340 static void post_thread_start (JavaThread *thread) NOT_JVMTI_RETURN; 341 static void post_thread_end (JavaThread *thread) NOT_JVMTI_RETURN; 342 343 // Support for java.lang.instrument agent loading. 344 static bool _should_post_class_file_load_hook; set_should_post_class_file_load_hook(bool on)345 inline static void set_should_post_class_file_load_hook(bool on) { _should_post_class_file_load_hook = on; } should_post_class_file_load_hook()346 inline static bool should_post_class_file_load_hook() { 347 JVMTI_ONLY(return _should_post_class_file_load_hook); 348 NOT_JVMTI(return false;) 349 } 350 static bool is_early_phase() NOT_JVMTI_RETURN_(false); 351 static bool has_early_class_hook_env() NOT_JVMTI_RETURN_(false); 352 // Return true if the class was modified by the hook. 353 static bool post_class_file_load_hook(Symbol* h_name, Handle class_loader, 354 Handle h_protection_domain, 355 unsigned char **data_ptr, unsigned char **end_ptr, 356 JvmtiCachedClassFileData **cache_ptr) NOT_JVMTI_RETURN_(false); 357 static void post_native_method_bind(Method* method, address* function_ptr) NOT_JVMTI_RETURN; 358 static void post_compiled_method_load(JvmtiEnv* env, nmethod *nm) NOT_JVMTI_RETURN; 359 static void post_compiled_method_load(nmethod *nm) NOT_JVMTI_RETURN; 360 static void post_dynamic_code_generated(const char *name, const void *code_begin, const void *code_end) NOT_JVMTI_RETURN; 361 362 // used to post a CompiledMethodUnload event 363 static void post_compiled_method_unload(jmethodID mid, const void *code_begin) NOT_JVMTI_RETURN; 364 365 // similiar to post_dynamic_code_generated except that it can be used to 366 // post a DynamicCodeGenerated event while holding locks in the VM. Any event 367 // posted using this function is recorded by the enclosing event collector 368 // -- JvmtiDynamicCodeEventCollector. 369 static void post_dynamic_code_generated_while_holding_locks(const char* name, address code_begin, address code_end) NOT_JVMTI_RETURN; 370 371 static void post_garbage_collection_finish() NOT_JVMTI_RETURN; 372 static void post_garbage_collection_start() NOT_JVMTI_RETURN; 373 static void post_data_dump() NOT_JVMTI_RETURN; 374 static void post_monitor_contended_enter(JavaThread *thread, ObjectMonitor *obj_mntr) NOT_JVMTI_RETURN; 375 static void post_monitor_contended_entered(JavaThread *thread, ObjectMonitor *obj_mntr) NOT_JVMTI_RETURN; 376 static void post_monitor_wait(JavaThread *thread, oop obj, jlong timeout) NOT_JVMTI_RETURN; 377 static void post_monitor_waited(JavaThread *thread, ObjectMonitor *obj_mntr, jboolean timed_out) NOT_JVMTI_RETURN; 378 static void post_object_free(JvmtiEnv* env, jlong tag) NOT_JVMTI_RETURN; 379 static void post_resource_exhausted(jint resource_exhausted_flags, const char* detail) NOT_JVMTI_RETURN; 380 static void record_vm_internal_object_allocation(oop object) NOT_JVMTI_RETURN; 381 // Post objects collected by vm_object_alloc_event_collector. 382 static void post_vm_object_alloc(JavaThread *thread, oop object) NOT_JVMTI_RETURN; 383 // Collects vm internal objects for later event posting. vm_object_alloc_event_collector(oop object)384 inline static void vm_object_alloc_event_collector(oop object) { 385 if (should_post_vm_object_alloc()) { 386 record_vm_internal_object_allocation(object); 387 } 388 } 389 390 static void record_sampled_internal_object_allocation(oop object) NOT_JVMTI_RETURN; 391 // Post objects collected by sampled_object_alloc_event_collector. 392 static void post_sampled_object_alloc(JavaThread *thread, oop object) NOT_JVMTI_RETURN; 393 394 // Collects vm internal objects for later event posting. sampled_object_alloc_event_collector(oop object)395 inline static void sampled_object_alloc_event_collector(oop object) { 396 if (should_post_sampled_object_alloc()) { 397 record_sampled_internal_object_allocation(object); 398 } 399 } 400 post_array_size_exhausted()401 inline static void post_array_size_exhausted() { 402 if (should_post_resource_exhausted()) { 403 post_resource_exhausted(JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR, 404 "Requested array size exceeds VM limit"); 405 } 406 } 407 408 static void cleanup_thread (JavaThread* thread) NOT_JVMTI_RETURN; 409 static void clear_detected_exception (JavaThread* thread) NOT_JVMTI_RETURN; 410 411 static void transition_pending_onload_raw_monitors() NOT_JVMTI_RETURN; 412 413 #if INCLUDE_SERVICES 414 // attach support 415 static jint load_agent_library(const char *agent, const char *absParam, const char *options, outputStream* out) NOT_JVMTI_RETURN_(JNI_ERR); 416 #endif 417 418 // SetNativeMethodPrefix support 419 static char** get_all_native_method_prefixes(int* count_ptr) NOT_JVMTI_RETURN_(NULL); 420 421 // JavaThread lifecycle support: 422 static jvmtiError cv_external_thread_to_JavaThread(ThreadsList * t_list, 423 jthread thread, 424 JavaThread ** jt_pp, 425 oop * thread_oop_p); 426 static jvmtiError cv_oop_to_JavaThread(ThreadsList * t_list, oop thread_oop, 427 JavaThread ** jt_pp); 428 }; 429 430 // Support class used by JvmtiDynamicCodeEventCollector and others. It 431 // describes a single code blob by name and address range. 432 class JvmtiCodeBlobDesc : public CHeapObj<mtInternal> { 433 private: 434 char _name[64]; 435 address _code_begin; 436 address _code_end; 437 438 public: JvmtiCodeBlobDesc(const char * name,address code_begin,address code_end)439 JvmtiCodeBlobDesc(const char *name, address code_begin, address code_end) { 440 assert(name != NULL, "all code blobs must be named"); 441 strncpy(_name, name, sizeof(_name) - 1); 442 _name[sizeof(_name)-1] = '\0'; 443 _code_begin = code_begin; 444 _code_end = code_end; 445 } name()446 char* name() { return _name; } code_begin()447 address code_begin() { return _code_begin; } code_end()448 address code_end() { return _code_end; } 449 }; 450 451 // JvmtiEventCollector is a helper class to setup thread for 452 // event collection. 453 class JvmtiEventCollector : public StackObj { 454 private: 455 JvmtiEventCollector* _prev; // Save previous one to support nested event collector. 456 bool _unset_jvmti_thread_state; 457 458 public: JvmtiEventCollector()459 JvmtiEventCollector() : _prev(NULL), _unset_jvmti_thread_state(false) {} 460 461 void setup_jvmti_thread_state(); // Set this collector in current thread, returns if success. 462 void unset_jvmti_thread_state(); // Reset previous collector in current thread. is_dynamic_code_event()463 virtual bool is_dynamic_code_event() { return false; } is_vm_object_alloc_event()464 virtual bool is_vm_object_alloc_event(){ return false; } is_sampled_object_alloc_event()465 virtual bool is_sampled_object_alloc_event(){ return false; } get_prev()466 JvmtiEventCollector *get_prev() { return _prev; } 467 }; 468 469 // A JvmtiDynamicCodeEventCollector is a helper class for the JvmtiExport 470 // interface. It collects "dynamic code generated" events that are posted 471 // while holding locks. When the event collector goes out of scope the 472 // events will be posted. 473 // 474 // Usage :- 475 // 476 // { 477 // JvmtiDynamicCodeEventCollector event_collector; 478 // : 479 // { MutexLocker ml(...) 480 // : 481 // JvmtiExport::post_dynamic_code_generated_while_holding_locks(...) 482 // } 483 // // event collector goes out of scope => post events to profiler. 484 // } 485 486 class JvmtiDynamicCodeEventCollector : public JvmtiEventCollector { 487 private: 488 GrowableArray<JvmtiCodeBlobDesc*>* _code_blobs; // collected code blob events 489 490 friend class JvmtiExport; 491 void register_stub(const char* name, address start, address end); 492 493 public: 494 JvmtiDynamicCodeEventCollector() NOT_JVMTI_RETURN; 495 ~JvmtiDynamicCodeEventCollector() NOT_JVMTI_RETURN; is_dynamic_code_event()496 bool is_dynamic_code_event() { return true; } 497 498 }; 499 500 // Used as a base class for object allocation collection and then posting 501 // the allocations to any event notification callbacks. 502 // 503 class JvmtiObjectAllocEventCollector : public JvmtiEventCollector { 504 protected: 505 GrowableArray<OopHandle>* _allocated; // field to record collected allocated object oop. 506 bool _enable; // This flag is enabled in constructor if set up in the thread state 507 // and disabled in destructor before posting event. To avoid 508 // collection of objects allocated while running java code inside 509 // agent post_X_object_alloc() event handler. 510 void (*_post_callback)(JavaThread*, oop); // what callback to use when destroying the collector. 511 512 friend class JvmtiExport; 513 514 // Record allocated object oop. 515 inline void record_allocation(oop obj); 516 517 public: 518 JvmtiObjectAllocEventCollector() NOT_JVMTI_RETURN; 519 520 void generate_call_for_allocated(); 521 is_enabled()522 bool is_enabled() { return _enable; } set_enabled(bool on)523 void set_enabled(bool on) { _enable = on; } 524 }; 525 526 // Used to record vm internally allocated object oops and post 527 // vm object alloc event for objects visible to java world. 528 // Constructor enables JvmtiThreadState flag and all vm allocated 529 // objects are recorded in a growable array. When destructor is 530 // called the vm object alloc event is posted for each object 531 // visible to java world. 532 // See jvm.cpp file for its usage. 533 // 534 class JvmtiVMObjectAllocEventCollector : public JvmtiObjectAllocEventCollector { 535 public: 536 JvmtiVMObjectAllocEventCollector() NOT_JVMTI_RETURN; 537 ~JvmtiVMObjectAllocEventCollector() NOT_JVMTI_RETURN; is_vm_object_alloc_event()538 virtual bool is_vm_object_alloc_event() { return true; } 539 }; 540 541 // Used to record sampled allocated object oops and post 542 // sampled object alloc event. 543 // Constructor enables JvmtiThreadState flag and all sampled allocated 544 // objects are recorded in a growable array. When destructor is 545 // called the sampled object alloc event is posted for each sampled object. 546 // See jvm.cpp file for its usage. 547 // 548 class JvmtiSampledObjectAllocEventCollector : public JvmtiObjectAllocEventCollector { 549 public: 550 JvmtiSampledObjectAllocEventCollector() NOT_JVMTI_RETURN; 551 ~JvmtiSampledObjectAllocEventCollector() NOT_JVMTI_RETURN; is_sampled_object_alloc_event()552 bool is_sampled_object_alloc_event() { return true; } 553 static bool object_alloc_is_safe_to_sample() NOT_JVMTI_RETURN_(false); 554 }; 555 556 // Marker class to disable the posting of VMObjectAlloc events 557 // within its scope. 558 // 559 // Usage :- 560 // 561 // { 562 // NoJvmtiVMObjectAllocMark njm; 563 // : 564 // // VMObjAlloc event will not be posted 565 // JvmtiExport::vm_object_alloc_event_collector(obj); 566 // : 567 // } 568 569 class NoJvmtiVMObjectAllocMark : public StackObj { 570 private: 571 // enclosing collector if enabled, NULL otherwise 572 JvmtiVMObjectAllocEventCollector *_collector; 573 was_enabled()574 bool was_enabled() { return _collector != NULL; } 575 576 public: 577 NoJvmtiVMObjectAllocMark() NOT_JVMTI_RETURN; 578 ~NoJvmtiVMObjectAllocMark() NOT_JVMTI_RETURN; 579 }; 580 581 582 // Base class for reporting GC events to JVMTI. 583 class JvmtiGCMarker : public StackObj { 584 public: 585 JvmtiGCMarker() NOT_JVMTI_RETURN; 586 ~JvmtiGCMarker() NOT_JVMTI_RETURN; 587 }; 588 589 // JvmtiHideSingleStepping is a helper class for hiding 590 // internal single step events. 591 class JvmtiHideSingleStepping : public StackObj { 592 private: 593 bool _single_step_hidden; 594 JavaThread * _thread; 595 596 public: JvmtiHideSingleStepping(JavaThread * thread)597 JvmtiHideSingleStepping(JavaThread * thread) { 598 assert(thread != NULL, "sanity check"); 599 600 _single_step_hidden = false; 601 _thread = thread; 602 if (JvmtiExport::should_post_single_step()) { 603 _single_step_hidden = JvmtiExport::hide_single_stepping(_thread); 604 } 605 } 606 ~JvmtiHideSingleStepping()607 ~JvmtiHideSingleStepping() { 608 if (_single_step_hidden) { 609 JvmtiExport::expose_single_stepping(_thread); 610 } 611 } 612 }; 613 614 #endif // SHARE_PRIMS_JVMTIEXPORT_HPP 615