1 /*
2 * Copyright (c) 2003, 2025, 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 #include "classfile/classLoaderExt.hpp"
26 #include "classfile/javaClasses.inline.hpp"
27 #include "classfile/stringTable.hpp"
28 #include "classfile/modules.hpp"
29 #include "classfile/systemDictionary.hpp"
30 #include "classfile/vmClasses.hpp"
31 #include "classfile/vmSymbols.hpp"
32 #include "gc/shared/collectedHeap.hpp"
33 #include "interpreter/bytecodeStream.hpp"
34 #include "interpreter/interpreter.hpp"
35 #include "jfr/jfrEvents.hpp"
36 #include "jvmtifiles/jvmtiEnv.hpp"
37 #include "logging/log.hpp"
38 #include "logging/logConfiguration.hpp"
39 #include "memory/allocation.hpp"
40 #include "memory/resourceArea.hpp"
41 #include "memory/universe.hpp"
42 #include "oops/instanceKlass.hpp"
43 #include "oops/klass.inline.hpp"
44 #include "oops/objArrayOop.inline.hpp"
45 #include "oops/oop.inline.hpp"
46 #include "prims/jniCheck.hpp"
47 #include "prims/jvm_misc.hpp"
48 #include "prims/jvmtiAgentThread.hpp"
49 #include "prims/jvmtiClassFileReconstituter.hpp"
50 #include "prims/jvmtiCodeBlobEvents.hpp"
51 #include "prims/jvmtiExtensions.hpp"
52 #include "prims/jvmtiGetLoadedClasses.hpp"
53 #include "prims/jvmtiImpl.hpp"
54 #include "prims/jvmtiManageCapabilities.hpp"
55 #include "prims/jvmtiRawMonitor.hpp"
56 #include "prims/jvmtiRedefineClasses.hpp"
57 #include "prims/jvmtiTagMap.hpp"
58 #include "prims/jvmtiThreadState.inline.hpp"
59 #include "prims/jvmtiUtil.hpp"
60 #include "runtime/arguments.hpp"
61 #include "runtime/deoptimization.hpp"
62 #include "runtime/fieldDescriptor.inline.hpp"
63 #include "runtime/handles.inline.hpp"
64 #include "runtime/interfaceSupport.inline.hpp"
65 #include "runtime/javaCalls.hpp"
66 #include "runtime/javaThread.inline.hpp"
67 #include "runtime/jfieldIDWorkaround.hpp"
68 #include "runtime/jniHandles.inline.hpp"
69 #include "runtime/objectMonitor.inline.hpp"
70 #include "runtime/os.hpp"
71 #include "runtime/osThread.hpp"
72 #include "runtime/reflectionUtils.hpp"
73 #include "runtime/signature.hpp"
74 #include "runtime/threadHeapSampler.hpp"
75 #include "runtime/threads.hpp"
76 #include "runtime/threadSMR.hpp"
77 #include "runtime/timerTrace.hpp"
78 #include "runtime/vframe.inline.hpp"
79 #include "runtime/vmThread.hpp"
80 #include "services/threadService.hpp"
81 #include "utilities/exceptions.hpp"
82 #include "utilities/preserveException.hpp"
83 #include "utilities/utf8.hpp"
84
85
86 #define FIXLATER 0 // REMOVE this when completed.
87
88 // FIXLATER: hook into JvmtiTrace
89 #define TraceJVMTICalls false
90
91 JvmtiEnv::JvmtiEnv(jint version) : JvmtiEnvBase(version) {
92 }
93
94 JvmtiEnv::~JvmtiEnv() {
95 }
96
97 JvmtiEnv*
98 JvmtiEnv::create_a_jvmti(jint version) {
99 return new JvmtiEnv(version);
100 }
101
102 // VM operation class to copy jni function table at safepoint.
103 // More than one java threads or jvmti agents may be reading/
104 // modifying jni function tables. To reduce the risk of bad
105 // interaction b/w these threads it is copied at safepoint.
106 class VM_JNIFunctionTableCopier : public VM_Operation {
107 private:
108 const struct JNINativeInterface_ *_function_table;
109 public:
110 VM_JNIFunctionTableCopier(const struct JNINativeInterface_ *func_tbl) {
111 _function_table = func_tbl;
112 };
113
114 VMOp_Type type() const { return VMOp_JNIFunctionTableCopier; }
115 void doit() {
116 copy_jni_function_table(_function_table);
117 };
118 };
119
120 //
121 // Do not change the "prefix" marker below, everything above it is copied
122 // unchanged into the filled stub, everything below is controlled by the
123 // stub filler (only method bodies are carried forward, and then only for
124 // functionality still in the spec).
125 //
126 // end file prefix
127
128 //
129 // Memory Management functions
130 //
131
132 // mem_ptr - pre-checked for null
133 jvmtiError
134 JvmtiEnv::Allocate(jlong size, unsigned char** mem_ptr) {
135 return allocate(size, mem_ptr);
136 } /* end Allocate */
137
138
139 // mem - null is a valid value, must be checked
140 jvmtiError
141 JvmtiEnv::Deallocate(unsigned char* mem) {
142 return deallocate(mem);
143 } /* end Deallocate */
144
145 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
146 // data - null is a valid value, must be checked
147 jvmtiError
148 JvmtiEnv::SetThreadLocalStorage(jthread thread, const void* data) {
149 JavaThread* current = JavaThread::current();
150 JvmtiThreadState* state = nullptr;
151 JvmtiVTMSTransitionDisabler disabler(thread);
152 ThreadsListHandle tlh(current);
153
154 JavaThread* java_thread = nullptr;
155 oop thread_obj = nullptr;
156 if (thread == nullptr) {
157 java_thread = current;
158 state = java_thread->jvmti_thread_state();
159 } else {
160 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, current, &java_thread, &thread_obj);
161 if (err != JVMTI_ERROR_NONE) {
162 return err;
163 }
164 state = java_lang_Thread::jvmti_thread_state(thread_obj);
165 }
166 if (state == nullptr) {
167 if (data == nullptr) {
168 // leaving state unset same as data set to null
169 return JVMTI_ERROR_NONE;
170 }
171 // otherwise, create the state
172 HandleMark hm(current);
173 Handle thread_handle(current, thread_obj);
174 state = JvmtiThreadState::state_for(java_thread, thread_handle);
175 if (state == nullptr) {
176 return JVMTI_ERROR_THREAD_NOT_ALIVE;
177 }
178 }
179 state->env_thread_state(this)->set_agent_thread_local_storage_data((void*)data);
180 return JVMTI_ERROR_NONE;
181 } /* end SetThreadLocalStorage */
182
183
184 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
185 // data_ptr - pre-checked for null
186 jvmtiError
187 JvmtiEnv::GetThreadLocalStorage(jthread thread, void** data_ptr) {
188 JavaThread* current_thread = JavaThread::current();
189 if (thread == nullptr) {
190 JvmtiThreadState* state = current_thread->jvmti_thread_state();
191 *data_ptr = (state == nullptr) ? nullptr :
192 state->env_thread_state(this)->get_agent_thread_local_storage_data();
193 } else {
194 // jvmti_GetThreadLocalStorage is "in native" and doesn't transition
195 // the thread to _thread_in_vm. However, when the TLS for a thread
196 // other than the current thread is required we need to transition
197 // from native so as to resolve the jthread.
198
199 MACOS_AARCH64_ONLY(ThreadWXEnable __wx(WXWrite, current_thread));
200 ThreadInVMfromNative __tiv(current_thread);
201 VM_ENTRY_BASE(jvmtiError, JvmtiEnv::GetThreadLocalStorage , current_thread)
202 DEBUG_ONLY(VMNativeEntryWrapper __vew;)
203
204 JvmtiVTMSTransitionDisabler disabler(thread);
205 ThreadsListHandle tlh(current_thread);
206
207 JavaThread* java_thread = nullptr;
208 oop thread_obj = nullptr;
209 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, current_thread, &java_thread, &thread_obj);
210 if (err != JVMTI_ERROR_NONE) {
211 return err;
212 }
213
214 HandleMark hm(current_thread);
215 Handle thread_handle(current_thread, thread_obj);
216 JvmtiThreadState* state = JvmtiThreadState::state_for(java_thread, thread_handle);
217 *data_ptr = (state == nullptr) ? nullptr :
218 state->env_thread_state(this)->get_agent_thread_local_storage_data();
219 }
220 return JVMTI_ERROR_NONE;
221 } /* end GetThreadLocalStorage */
222
223 //
224 // Module functions
225 //
226
227 // module_count_ptr - pre-checked for null
228 // modules_ptr - pre-checked for null
229 jvmtiError
230 JvmtiEnv::GetAllModules(jint* module_count_ptr, jobject** modules_ptr) {
231 JvmtiModuleClosure jmc;
232
233 return jmc.get_all_modules(this, module_count_ptr, modules_ptr);
234 } /* end GetAllModules */
235
236
237 // class_loader - null is a valid value, must be pre-checked
238 // package_name - pre-checked for null
239 // module_ptr - pre-checked for null
240 jvmtiError
241 JvmtiEnv::GetNamedModule(jobject class_loader, const char* package_name, jobject* module_ptr) {
242 JavaThread* THREAD = JavaThread::current(); // For exception macros.
243 ResourceMark rm(THREAD);
244
245 Handle h_loader (THREAD, JNIHandles::resolve(class_loader));
246 // Check that loader is a subclass of java.lang.ClassLoader.
247 if (h_loader.not_null() && !java_lang_ClassLoader::is_subclass(h_loader->klass())) {
248 return JVMTI_ERROR_ILLEGAL_ARGUMENT;
249 }
250 oop module = Modules::get_named_module(h_loader, package_name);
251 *module_ptr = module != nullptr ? JNIHandles::make_local(THREAD, module) : nullptr;
252 return JVMTI_ERROR_NONE;
253 } /* end GetNamedModule */
254
255
256 // module - pre-checked for null
257 // to_module - pre-checked for null
258 jvmtiError
259 JvmtiEnv::AddModuleReads(jobject module, jobject to_module) {
260 JavaThread* THREAD = JavaThread::current(); // For exception macros.
261
262 // check module
263 Handle h_module(THREAD, JNIHandles::resolve(module));
264 if (!java_lang_Module::is_instance(h_module())) {
265 return JVMTI_ERROR_INVALID_MODULE;
266 }
267 // check to_module
268 Handle h_to_module(THREAD, JNIHandles::resolve(to_module));
269 if (!java_lang_Module::is_instance(h_to_module())) {
270 return JVMTI_ERROR_INVALID_MODULE;
271 }
272 return JvmtiExport::add_module_reads(h_module, h_to_module, THREAD);
273 } /* end AddModuleReads */
274
275
276 // module - pre-checked for null
277 // pkg_name - pre-checked for null
278 // to_module - pre-checked for null
279 jvmtiError
280 JvmtiEnv::AddModuleExports(jobject module, const char* pkg_name, jobject to_module) {
281 JavaThread* THREAD = JavaThread::current(); // For exception macros.
282 Handle h_pkg = java_lang_String::create_from_str(pkg_name, THREAD);
283
284 // check module
285 Handle h_module(THREAD, JNIHandles::resolve(module));
286 if (!java_lang_Module::is_instance(h_module())) {
287 return JVMTI_ERROR_INVALID_MODULE;
288 }
289 // check to_module
290 Handle h_to_module(THREAD, JNIHandles::resolve(to_module));
291 if (!java_lang_Module::is_instance(h_to_module())) {
292 return JVMTI_ERROR_INVALID_MODULE;
293 }
294 return JvmtiExport::add_module_exports(h_module, h_pkg, h_to_module, THREAD);
295 } /* end AddModuleExports */
296
297
298 // module - pre-checked for null
299 // pkg_name - pre-checked for null
300 // to_module - pre-checked for null
301 jvmtiError
302 JvmtiEnv::AddModuleOpens(jobject module, const char* pkg_name, jobject to_module) {
303 JavaThread* THREAD = JavaThread::current(); // For exception macros.
304 Handle h_pkg = java_lang_String::create_from_str(pkg_name, THREAD);
305
306 // check module
307 Handle h_module(THREAD, JNIHandles::resolve(module));
308 if (!java_lang_Module::is_instance(h_module())) {
309 return JVMTI_ERROR_INVALID_MODULE;
310 }
311 // check to_module
312 Handle h_to_module(THREAD, JNIHandles::resolve(to_module));
313 if (!java_lang_Module::is_instance(h_to_module())) {
314 return JVMTI_ERROR_INVALID_MODULE;
315 }
316 return JvmtiExport::add_module_opens(h_module, h_pkg, h_to_module, THREAD);
317 } /* end AddModuleOpens */
318
319
320 // module - pre-checked for null
321 // service - pre-checked for null
322 jvmtiError
323 JvmtiEnv::AddModuleUses(jobject module, jclass service) {
324 JavaThread* THREAD = JavaThread::current(); // For exception macros.
325
326 // check module
327 Handle h_module(THREAD, JNIHandles::resolve(module));
328 if (!java_lang_Module::is_instance(h_module())) {
329 return JVMTI_ERROR_INVALID_MODULE;
330 }
331 // check service
332 Handle h_service(THREAD, JNIHandles::resolve_external_guard(service));
333 if (!java_lang_Class::is_instance(h_service()) ||
334 java_lang_Class::is_primitive(h_service())) {
335 return JVMTI_ERROR_INVALID_CLASS;
336 }
337 return JvmtiExport::add_module_uses(h_module, h_service, THREAD);
338 } /* end AddModuleUses */
339
340
341 // module - pre-checked for null
342 // service - pre-checked for null
343 // impl_class - pre-checked for null
344 jvmtiError
345 JvmtiEnv::AddModuleProvides(jobject module, jclass service, jclass impl_class) {
346 JavaThread* THREAD = JavaThread::current(); // For exception macros.
347
348 // check module
349 Handle h_module(THREAD, JNIHandles::resolve(module));
350 if (!java_lang_Module::is_instance(h_module())) {
351 return JVMTI_ERROR_INVALID_MODULE;
352 }
353 // check service
354 Handle h_service(THREAD, JNIHandles::resolve_external_guard(service));
355 if (!java_lang_Class::is_instance(h_service()) ||
356 java_lang_Class::is_primitive(h_service())) {
357 return JVMTI_ERROR_INVALID_CLASS;
358 }
359 // check impl_class
360 Handle h_impl_class(THREAD, JNIHandles::resolve_external_guard(impl_class));
361 if (!java_lang_Class::is_instance(h_impl_class()) ||
362 java_lang_Class::is_primitive(h_impl_class())) {
363 return JVMTI_ERROR_INVALID_CLASS;
364 }
365 return JvmtiExport::add_module_provides(h_module, h_service, h_impl_class, THREAD);
366 } /* end AddModuleProvides */
367
368 // module - pre-checked for null
369 // is_modifiable_class_ptr - pre-checked for null
370 jvmtiError
371 JvmtiEnv::IsModifiableModule(jobject module, jboolean* is_modifiable_module_ptr) {
372 JavaThread* current = JavaThread::current();
373
374 // check module
375 Handle h_module(current, JNIHandles::resolve(module));
376 if (!java_lang_Module::is_instance(h_module())) {
377 return JVMTI_ERROR_INVALID_MODULE;
378 }
379
380 *is_modifiable_module_ptr = JNI_TRUE;
381 return JVMTI_ERROR_NONE;
382 } /* end IsModifiableModule */
383
384
385 //
386 // Class functions
387 //
388
389 // class_count_ptr - pre-checked for null
390 // classes_ptr - pre-checked for null
391 jvmtiError
392 JvmtiEnv::GetLoadedClasses(jint* class_count_ptr, jclass** classes_ptr) {
393 return JvmtiGetLoadedClasses::getLoadedClasses(this, class_count_ptr, classes_ptr);
394 } /* end GetLoadedClasses */
395
396
397 // initiating_loader - null is a valid value, must be checked
398 // class_count_ptr - pre-checked for null
399 // classes_ptr - pre-checked for null
400 jvmtiError
401 JvmtiEnv::GetClassLoaderClasses(jobject initiating_loader, jint* class_count_ptr, jclass** classes_ptr) {
402 return JvmtiGetLoadedClasses::getClassLoaderClasses(this, initiating_loader,
403 class_count_ptr, classes_ptr);
404 } /* end GetClassLoaderClasses */
405
406 // k_mirror - may be primitive, this must be checked
407 // is_modifiable_class_ptr - pre-checked for null
408 jvmtiError
409 JvmtiEnv::IsModifiableClass(oop k_mirror, jboolean* is_modifiable_class_ptr) {
410 *is_modifiable_class_ptr = VM_RedefineClasses::is_modifiable_class(k_mirror)?
411 JNI_TRUE : JNI_FALSE;
412 return JVMTI_ERROR_NONE;
413 } /* end IsModifiableClass */
414
415 // class_count - pre-checked to be greater than or equal to 0
416 // classes - pre-checked for null
417 jvmtiError
418 JvmtiEnv::RetransformClasses(jint class_count, const jclass* classes) {
419 //TODO: add locking
420
421 int index;
422 JavaThread* current_thread = JavaThread::current();
423 ResourceMark rm(current_thread);
424
425 jvmtiClassDefinition* class_definitions =
426 NEW_RESOURCE_ARRAY(jvmtiClassDefinition, class_count);
427 NULL_CHECK(class_definitions, JVMTI_ERROR_OUT_OF_MEMORY);
428
429 for (index = 0; index < class_count; index++) {
430 HandleMark hm(current_thread);
431
432 jclass jcls = classes[index];
433 oop k_mirror = JNIHandles::resolve_external_guard(jcls);
434 if (k_mirror == nullptr) {
435 return JVMTI_ERROR_INVALID_CLASS;
436 }
437 if (!k_mirror->is_a(vmClasses::Class_klass())) {
438 return JVMTI_ERROR_INVALID_CLASS;
439 }
440
441 if (!VM_RedefineClasses::is_modifiable_class(k_mirror)) {
442 return JVMTI_ERROR_UNMODIFIABLE_CLASS;
443 }
444
445 Klass* klass = java_lang_Class::as_Klass(k_mirror);
446
447 jint status = klass->jvmti_class_status();
448 if (status & (JVMTI_CLASS_STATUS_ERROR)) {
449 return JVMTI_ERROR_INVALID_CLASS;
450 }
451
452 InstanceKlass* ik = InstanceKlass::cast(klass);
453 if (ik->get_cached_class_file_bytes() == nullptr) {
454 // Not cached, we need to reconstitute the class file from the
455 // VM representation. We don't attach the reconstituted class
456 // bytes to the InstanceKlass here because they have not been
457 // validated and we're not at a safepoint.
458 JvmtiClassFileReconstituter reconstituter(ik);
459 if (reconstituter.get_error() != JVMTI_ERROR_NONE) {
460 return reconstituter.get_error();
461 }
462
463 class_definitions[index].class_byte_count = (jint)reconstituter.class_file_size();
464 class_definitions[index].class_bytes = (unsigned char*)
465 reconstituter.class_file_bytes();
466 } else {
467 // it is cached, get it from the cache
468 class_definitions[index].class_byte_count = ik->get_cached_class_file_len();
469 class_definitions[index].class_bytes = ik->get_cached_class_file_bytes();
470 }
471 class_definitions[index].klass = jcls;
472 }
473 EventRetransformClasses event;
474 VM_RedefineClasses op(class_count, class_definitions, jvmti_class_load_kind_retransform);
475 VMThread::execute(&op);
476 jvmtiError error = op.check_error();
477 if (error == JVMTI_ERROR_NONE) {
478 event.set_classCount(class_count);
479 event.set_redefinitionId(op.id());
480 event.commit();
481 }
482 return error;
483 } /* end RetransformClasses */
484
485
486 // class_count - pre-checked to be greater than or equal to 0
487 // class_definitions - pre-checked for null
488 jvmtiError
489 JvmtiEnv::RedefineClasses(jint class_count, const jvmtiClassDefinition* class_definitions) {
490 //TODO: add locking
491 EventRedefineClasses event;
492 VM_RedefineClasses op(class_count, class_definitions, jvmti_class_load_kind_redefine);
493 VMThread::execute(&op);
494 jvmtiError error = op.check_error();
495 if (error == JVMTI_ERROR_NONE) {
496 event.set_classCount(class_count);
497 event.set_redefinitionId(op.id());
498 event.commit();
499 }
500 return error;
501 } /* end RedefineClasses */
502
503
504 //
505 // Object functions
506 //
507
508 // size_ptr - pre-checked for null
509 jvmtiError
510 JvmtiEnv::GetObjectSize(jobject object, jlong* size_ptr) {
511 oop mirror = JNIHandles::resolve_external_guard(object);
512 NULL_CHECK(mirror, JVMTI_ERROR_INVALID_OBJECT);
513 *size_ptr = (jlong)mirror->size() * wordSize;
514 return JVMTI_ERROR_NONE;
515 } /* end GetObjectSize */
516
517 //
518 // Method functions
519 //
520
521 // prefix - null is a valid value, must be checked
522 jvmtiError
523 JvmtiEnv::SetNativeMethodPrefix(const char* prefix) {
524 return prefix == nullptr?
525 SetNativeMethodPrefixes(0, nullptr) :
526 SetNativeMethodPrefixes(1, (char**)&prefix);
527 } /* end SetNativeMethodPrefix */
528
529
530 // prefix_count - pre-checked to be greater than or equal to 0
531 // prefixes - pre-checked for null
532 jvmtiError
533 JvmtiEnv::SetNativeMethodPrefixes(jint prefix_count, char** prefixes) {
534 // Have to grab JVMTI thread state lock to be sure that some thread
535 // isn't accessing the prefixes at the same time we are setting them.
536 // No locks during VM bring-up.
537 if (Threads::number_of_threads() == 0) {
538 return set_native_method_prefixes(prefix_count, prefixes);
539 } else {
540 MutexLocker mu(JvmtiThreadState_lock);
541 return set_native_method_prefixes(prefix_count, prefixes);
542 }
543 } /* end SetNativeMethodPrefixes */
544
545 //
546 // Event Management functions
547 //
548
549 // callbacks - null is a valid value, must be checked
550 // size_of_callbacks - pre-checked to be greater than or equal to 0
551 jvmtiError
552 JvmtiEnv::SetEventCallbacks(const jvmtiEventCallbacks* callbacks, jint size_of_callbacks) {
553 JvmtiVTMSTransitionDisabler disabler;
554 JvmtiEventController::set_event_callbacks(this, callbacks, size_of_callbacks);
555 return JVMTI_ERROR_NONE;
556 } /* end SetEventCallbacks */
557
558
559 // event_thread - null is a valid value, must be checked
560 jvmtiError
561 JvmtiEnv::SetEventNotificationMode(jvmtiEventMode mode, jvmtiEvent event_type, jthread event_thread, ...) {
562 bool enabled = (mode == JVMTI_ENABLE);
563
564 // event_type must be valid
565 if (!JvmtiEventController::is_valid_event_type(event_type)) {
566 return JVMTI_ERROR_INVALID_EVENT_TYPE;
567 }
568
569 // assure that needed capabilities are present
570 if (enabled && !JvmtiUtil::has_event_capability(event_type, get_capabilities())) {
571 return JVMTI_ERROR_MUST_POSSESS_CAPABILITY;
572 }
573
574 if (event_type == JVMTI_EVENT_CLASS_FILE_LOAD_HOOK && enabled) {
575 record_class_file_load_hook_enabled();
576 }
577 JvmtiVTMSTransitionDisabler disabler;
578
579 if (event_thread == nullptr) {
580 // Can be called at Agent_OnLoad() time with event_thread == nullptr
581 // when Thread::current() does not work yet so we cannot create a
582 // ThreadsListHandle that is common to both thread-specific and
583 // global code paths.
584
585 JvmtiEventController::set_user_enabled(this, nullptr, (oop) nullptr, event_type, enabled);
586 } else {
587 // We have a specified event_thread.
588 JavaThread* current = JavaThread::current();
589 ThreadsListHandle tlh(current);
590
591 JavaThread* java_thread = nullptr;
592 oop thread_obj = nullptr;
593 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), event_thread, current, &java_thread, &thread_obj);
594 if (err != JVMTI_ERROR_NONE) {
595 return err;
596 }
597
598 // global events cannot be controlled at thread level.
599 if (JvmtiEventController::is_global_event(event_type)) {
600 return JVMTI_ERROR_ILLEGAL_ARGUMENT;
601 }
602
603 JvmtiEventController::set_user_enabled(this, java_thread, thread_obj, event_type, enabled);
604 }
605
606 return JVMTI_ERROR_NONE;
607 } /* end SetEventNotificationMode */
608
609 //
610 // Capability functions
611 //
612
613 // capabilities_ptr - pre-checked for null
614 jvmtiError
615 JvmtiEnv::GetPotentialCapabilities(jvmtiCapabilities* capabilities_ptr) {
616 JvmtiManageCapabilities::get_potential_capabilities(get_capabilities(),
617 get_prohibited_capabilities(),
618 capabilities_ptr);
619 return JVMTI_ERROR_NONE;
620 } /* end GetPotentialCapabilities */
621
622
623 // capabilities_ptr - pre-checked for null
624 jvmtiError
625 JvmtiEnv::AddCapabilities(const jvmtiCapabilities* capabilities_ptr) {
626 return JvmtiManageCapabilities::add_capabilities(get_capabilities(),
627 get_prohibited_capabilities(),
628 capabilities_ptr,
629 get_capabilities());
630 } /* end AddCapabilities */
631
632
633 // capabilities_ptr - pre-checked for null
634 jvmtiError
635 JvmtiEnv::RelinquishCapabilities(const jvmtiCapabilities* capabilities_ptr) {
636 JvmtiManageCapabilities::relinquish_capabilities(get_capabilities(), capabilities_ptr, get_capabilities());
637 return JVMTI_ERROR_NONE;
638 } /* end RelinquishCapabilities */
639
640
641 // capabilities_ptr - pre-checked for null
642 jvmtiError
643 JvmtiEnv::GetCapabilities(jvmtiCapabilities* capabilities_ptr) {
644 JvmtiManageCapabilities::copy_capabilities(get_capabilities(), capabilities_ptr);
645 return JVMTI_ERROR_NONE;
646 } /* end GetCapabilities */
647
648 //
649 // Class Loader Search functions
650 //
651
652 // segment - pre-checked for null
653 jvmtiError
654 JvmtiEnv::AddToBootstrapClassLoaderSearch(const char* segment) {
655 jvmtiPhase phase = get_phase();
656 if (phase == JVMTI_PHASE_ONLOAD) {
657 Arguments::append_sysclasspath(segment);
658 return JVMTI_ERROR_NONE;
659 } else if (use_version_1_0_semantics()) {
660 // This JvmtiEnv requested version 1.0 semantics and this function
661 // is only allowed in the ONLOAD phase in version 1.0 so we need to
662 // return an error here.
663 return JVMTI_ERROR_WRONG_PHASE;
664 } else if (phase == JVMTI_PHASE_LIVE) {
665 // The phase is checked by the wrapper that called this function,
666 // but this thread could be racing with the thread that is
667 // terminating the VM so we check one more time.
668
669 // create the zip entry
670 ClassPathZipEntry* zip_entry = ClassLoader::create_class_path_zip_entry(segment);
671 if (zip_entry == nullptr) {
672 return JVMTI_ERROR_ILLEGAL_ARGUMENT;
673 }
674
675 // add the jar file to the bootclasspath
676 log_info(class, load)("opened: %s", zip_entry->name());
677 #if INCLUDE_CDS
678 ClassLoaderExt::append_boot_classpath(zip_entry);
679 #else
680 ClassLoader::add_to_boot_append_entries(zip_entry);
681 #endif
682 return JVMTI_ERROR_NONE;
683 } else {
684 return JVMTI_ERROR_WRONG_PHASE;
685 }
686
687 } /* end AddToBootstrapClassLoaderSearch */
688
689
690 // segment - pre-checked for null
691 jvmtiError
692 JvmtiEnv::AddToSystemClassLoaderSearch(const char* segment) {
693 jvmtiPhase phase = get_phase();
694
695 if (phase == JVMTI_PHASE_ONLOAD) {
696 for (SystemProperty* p = Arguments::system_properties(); p != nullptr; p = p->next()) {
697 if (strcmp("java.class.path", p->key()) == 0) {
698 p->append_value(segment);
699 break;
700 }
701 }
702 return JVMTI_ERROR_NONE;
703 } else if (phase == JVMTI_PHASE_LIVE) {
704 // The phase is checked by the wrapper that called this function,
705 // but this thread could be racing with the thread that is
706 // terminating the VM so we check one more time.
707 JavaThread* THREAD = JavaThread::current(); // For exception macros.
708 HandleMark hm(THREAD);
709
710 // create the zip entry (which will open the zip file and hence
711 // check that the segment is indeed a zip file).
712 ClassPathZipEntry* zip_entry = ClassLoader::create_class_path_zip_entry(segment);
713 if (zip_entry == nullptr) {
714 return JVMTI_ERROR_ILLEGAL_ARGUMENT;
715 }
716 delete zip_entry; // no longer needed
717
718 Handle loader(THREAD, SystemDictionary::java_system_loader());
719
720 // need the path as java.lang.String
721 Handle path = java_lang_String::create_from_platform_dependent_str(segment, THREAD);
722 if (HAS_PENDING_EXCEPTION) {
723 CLEAR_PENDING_EXCEPTION;
724 return JVMTI_ERROR_INTERNAL;
725 }
726
727 // Invoke the appendToClassPathForInstrumentation method - if the method
728 // is not found it means the loader doesn't support adding to the class path
729 // in the live phase.
730 {
731 JavaValue res(T_VOID);
732 JavaCalls::call_special(&res,
733 loader,
734 loader->klass(),
735 vmSymbols::appendToClassPathForInstrumentation_name(),
736 vmSymbols::appendToClassPathForInstrumentation_signature(),
737 path,
738 THREAD);
739 if (HAS_PENDING_EXCEPTION) {
740 Symbol* ex_name = PENDING_EXCEPTION->klass()->name();
741 CLEAR_PENDING_EXCEPTION;
742
743 if (ex_name == vmSymbols::java_lang_NoSuchMethodError()) {
744 return JVMTI_ERROR_CLASS_LOADER_UNSUPPORTED;
745 } else {
746 return JVMTI_ERROR_INTERNAL;
747 }
748 }
749 }
750
751 return JVMTI_ERROR_NONE;
752 } else {
753 return JVMTI_ERROR_WRONG_PHASE;
754 }
755 } /* end AddToSystemClassLoaderSearch */
756
757 //
758 // General functions
759 //
760
761 // phase_ptr - pre-checked for null
762 jvmtiError
763 JvmtiEnv::GetPhase(jvmtiPhase* phase_ptr) {
764 *phase_ptr = phase();
765 return JVMTI_ERROR_NONE;
766 } /* end GetPhase */
767
768
769 jvmtiError
770 JvmtiEnv::DisposeEnvironment() {
771 dispose();
772 return JVMTI_ERROR_NONE;
773 } /* end DisposeEnvironment */
774
775
776 // data - null is a valid value, must be checked
777 jvmtiError
778 JvmtiEnv::SetEnvironmentLocalStorage(const void* data) {
779 set_env_local_storage(data);
780 return JVMTI_ERROR_NONE;
781 } /* end SetEnvironmentLocalStorage */
782
783
784 // data_ptr - pre-checked for null
785 jvmtiError
786 JvmtiEnv::GetEnvironmentLocalStorage(void** data_ptr) {
787 *data_ptr = (void*)get_env_local_storage();
788 return JVMTI_ERROR_NONE;
789 } /* end GetEnvironmentLocalStorage */
790
791 // version_ptr - pre-checked for null
792 jvmtiError
793 JvmtiEnv::GetVersionNumber(jint* version_ptr) {
794 *version_ptr = JVMTI_VERSION;
795 return JVMTI_ERROR_NONE;
796 } /* end GetVersionNumber */
797
798
799 // name_ptr - pre-checked for null
800 jvmtiError
801 JvmtiEnv::GetErrorName(jvmtiError error, char** name_ptr) {
802 if (error < JVMTI_ERROR_NONE || error > JVMTI_ERROR_MAX) {
803 return JVMTI_ERROR_ILLEGAL_ARGUMENT;
804 }
805 const char *name = JvmtiUtil::error_name(error);
806 if (name == nullptr) {
807 return JVMTI_ERROR_ILLEGAL_ARGUMENT;
808 }
809 size_t len = strlen(name) + 1;
810 jvmtiError err = allocate(len, (unsigned char**)name_ptr);
811 if (err == JVMTI_ERROR_NONE) {
812 memcpy(*name_ptr, name, len);
813 }
814 return err;
815 } /* end GetErrorName */
816
817
818 jvmtiError
819 JvmtiEnv::SetVerboseFlag(jvmtiVerboseFlag flag, jboolean value) {
820 LogLevelType level = value == 0 ? LogLevel::Off : LogLevel::Info;
821 switch (flag) {
822 case JVMTI_VERBOSE_OTHER:
823 // ignore
824 break;
825 case JVMTI_VERBOSE_CLASS:
826 LogConfiguration::configure_stdout(level, false, LOG_TAGS(class, unload));
827 LogConfiguration::configure_stdout(level, false, LOG_TAGS(class, load));
828 break;
829 case JVMTI_VERBOSE_GC:
830 LogConfiguration::configure_stdout(level, true, LOG_TAGS(gc));
831 break;
832 case JVMTI_VERBOSE_JNI:
833 level = value == 0 ? LogLevel::Off : LogLevel::Debug;
834 LogConfiguration::configure_stdout(level, true, LOG_TAGS(jni, resolve));
835 break;
836 default:
837 return JVMTI_ERROR_ILLEGAL_ARGUMENT;
838 };
839 return JVMTI_ERROR_NONE;
840 } /* end SetVerboseFlag */
841
842
843 // format_ptr - pre-checked for null
844 jvmtiError
845 JvmtiEnv::GetJLocationFormat(jvmtiJlocationFormat* format_ptr) {
846 *format_ptr = JVMTI_JLOCATION_JVMBCI;
847 return JVMTI_ERROR_NONE;
848 } /* end GetJLocationFormat */
849
850 //
851 // Thread functions
852 //
853
854 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
855 // thread_state_ptr - pre-checked for null
856 jvmtiError
857 JvmtiEnv::GetThreadState(jthread thread, jint* thread_state_ptr) {
858 JavaThread* current_thread = JavaThread::current();
859 JvmtiVTMSTransitionDisabler disabler(thread);
860 ThreadsListHandle tlh(current_thread);
861
862 JavaThread* java_thread = nullptr;
863 oop thread_oop = nullptr;
864 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, current_thread, &java_thread, &thread_oop);
865 if (err != JVMTI_ERROR_NONE && err != JVMTI_ERROR_THREAD_NOT_ALIVE) {
866 // We got an error code so we don't have a JavaThread*, but only
867 // return an error from here if the error is not because the thread
868 // is a virtual thread.
869 return err;
870 }
871 *thread_state_ptr = JvmtiEnvBase::get_thread_or_vthread_state(thread_oop, java_thread);
872 return JVMTI_ERROR_NONE;
873 } /* end GetThreadState */
874
875
876 // thread_ptr - pre-checked for null
877 jvmtiError
878 JvmtiEnv::GetCurrentThread(jthread* thread_ptr) {
879 JavaThread* cur_thread = JavaThread::current();
880 oop thread_oop = get_vthread_or_thread_oop(cur_thread);
881
882 *thread_ptr = (jthread)JNIHandles::make_local(cur_thread, thread_oop);
883 return JVMTI_ERROR_NONE;
884 } /* end GetCurrentThread */
885
886
887 // threads_count_ptr - pre-checked for null
888 // threads_ptr - pre-checked for null
889 jvmtiError
890 JvmtiEnv::GetAllThreads(jint* threads_count_ptr, jthread** threads_ptr) {
891 int nthreads = 0;
892 Handle *thread_objs = nullptr;
893 Thread* current_thread = Thread::current();
894 ResourceMark rm(current_thread);
895 HandleMark hm(current_thread);
896
897 // enumerate threads (including agent threads)
898 ThreadsListEnumerator tle(current_thread, true);
899 nthreads = tle.num_threads();
900 *threads_count_ptr = nthreads;
901
902 if (nthreads == 0) {
903 *threads_ptr = nullptr;
904 return JVMTI_ERROR_NONE;
905 }
906
907 thread_objs = NEW_RESOURCE_ARRAY(Handle, nthreads);
908 NULL_CHECK(thread_objs, JVMTI_ERROR_OUT_OF_MEMORY);
909
910 for (int i = 0; i < nthreads; i++) {
911 thread_objs[i] = Handle(tle.get_threadObj(i));
912 }
913
914 jthread *jthreads = new_jthreadArray(nthreads, thread_objs);
915 NULL_CHECK(jthreads, JVMTI_ERROR_OUT_OF_MEMORY);
916
917 *threads_ptr = jthreads;
918 return JVMTI_ERROR_NONE;
919 } /* end GetAllThreads */
920
921
922 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
923 jvmtiError
924 JvmtiEnv::SuspendThread(jthread thread) {
925 JavaThread* current = JavaThread::current();
926 HandleMark hm(current);
927 Handle self_tobj;
928
929 jvmtiError err;
930 {
931 JvmtiVTMSTransitionDisabler disabler(true);
932 ThreadsListHandle tlh(current);
933 JavaThread* java_thread = nullptr;
934 oop thread_oop = nullptr;
935
936 err = get_threadOop_and_JavaThread(tlh.list(), thread, current, &java_thread, &thread_oop);
937 if (err != JVMTI_ERROR_NONE) {
938 return err;
939 }
940
941 // Do not use JvmtiVTMSTransitionDisabler in context of self suspend to avoid deadlocks.
942 if (java_thread != current) {
943 err = suspend_thread(thread_oop, java_thread, /* single_suspend */ true);
944 return err;
945 }
946 // protect thread_oop as a safepoint can be reached in disabler destructor
947 self_tobj = Handle(current, thread_oop);
948 }
949 // Do self suspend for current JavaThread.
950 err = suspend_thread(self_tobj(), current, /* single_suspend */ true);
951 return err;
952 } /* end SuspendThread */
953
954
955 // request_count - pre-checked to be greater than or equal to 0
956 // request_list - pre-checked for null
957 // results - pre-checked for null
958 jvmtiError
959 JvmtiEnv::SuspendThreadList(jint request_count, const jthread* request_list, jvmtiError* results) {
960 JavaThread* current = JavaThread::current();
961 HandleMark hm(current);
962 Handle self_tobj;
963 int self_idx = -1;
964
965 {
966 JvmtiVTMSTransitionDisabler disabler(true);
967 ThreadsListHandle tlh(current);
968
969 for (int i = 0; i < request_count; i++) {
970 JavaThread *java_thread = nullptr;
971 oop thread_oop = nullptr;
972 jthread thread = request_list[i];
973 jvmtiError err = JvmtiExport::cv_external_thread_to_JavaThread(tlh.list(), thread, &java_thread, &thread_oop);
974
975 if (thread_oop != nullptr &&
976 java_lang_VirtualThread::is_instance(thread_oop) &&
977 !JvmtiEnvBase::is_vthread_alive(thread_oop)) {
978 err = JVMTI_ERROR_THREAD_NOT_ALIVE;
979 }
980 if (err != JVMTI_ERROR_NONE) {
981 if (thread_oop == nullptr || err != JVMTI_ERROR_INVALID_THREAD) {
982 results[i] = err;
983 continue;
984 }
985 }
986 if (java_thread == current) {
987 self_idx = i;
988 self_tobj = Handle(current, thread_oop);
989 continue; // self suspend after all other suspends
990 }
991 results[i] = suspend_thread(thread_oop, java_thread, /* single_suspend */ true);
992 }
993 }
994 // Self suspend after all other suspends if necessary.
995 // Do not use JvmtiVTMSTransitionDisabler in context of self suspend to avoid deadlocks.
996 if (self_tobj() != nullptr) {
997 // there should not be any error for current java_thread
998 results[self_idx] = suspend_thread(self_tobj(), current, /* single_suspend */ true);
999 }
1000 // per-thread suspend results returned via results parameter
1001 return JVMTI_ERROR_NONE;
1002 } /* end SuspendThreadList */
1003
1004
1005 jvmtiError
1006 JvmtiEnv::SuspendAllVirtualThreads(jint except_count, const jthread* except_list) {
1007 if (get_capabilities()->can_support_virtual_threads == 0) {
1008 return JVMTI_ERROR_MUST_POSSESS_CAPABILITY;
1009 }
1010 JavaThread* current = JavaThread::current();
1011 HandleMark hm(current);
1012 Handle self_tobj;
1013
1014 {
1015 ResourceMark rm(current);
1016 JvmtiVTMSTransitionDisabler disabler(true);
1017 ThreadsListHandle tlh(current);
1018 GrowableArray<jthread>* elist = new GrowableArray<jthread>(except_count);
1019
1020 jvmtiError err = JvmtiEnvBase::check_thread_list(except_count, except_list);
1021 if (err != JVMTI_ERROR_NONE) {
1022 return err;
1023 }
1024
1025 // Collect threads from except_list for which resumed status must be restored (only for VirtualThread case)
1026 for (int idx = 0; idx < except_count; idx++) {
1027 jthread thread = except_list[idx];
1028 oop thread_oop = JNIHandles::resolve_external_guard(thread);
1029 if (java_lang_VirtualThread::is_instance(thread_oop) && !JvmtiVTSuspender::is_vthread_suspended(thread_oop)) {
1030 // is not suspended, so its resumed status must be restored
1031 elist->append(except_list[idx]);
1032 }
1033 }
1034
1035 for (JavaThreadIteratorWithHandle jtiwh; JavaThread *java_thread = jtiwh.next(); ) {
1036 oop vt_oop = java_thread->jvmti_vthread();
1037 if (!java_thread->is_exiting() &&
1038 !java_thread->is_jvmti_agent_thread() &&
1039 !java_thread->is_hidden_from_external_view() &&
1040 vt_oop != nullptr &&
1041 ((java_lang_VirtualThread::is_instance(vt_oop) &&
1042 JvmtiEnvBase::is_vthread_alive(vt_oop) &&
1043 !JvmtiVTSuspender::is_vthread_suspended(vt_oop)) ||
1044 (vt_oop->is_a(vmClasses::BoundVirtualThread_klass()) && !java_thread->is_suspended())) &&
1045 !is_in_thread_list(except_count, except_list, vt_oop)
1046 ) {
1047 if (java_thread == current) {
1048 self_tobj = Handle(current, vt_oop);
1049 continue; // self suspend after all other suspends
1050 }
1051 suspend_thread(vt_oop, java_thread, /* single_suspend */ false);
1052 }
1053 }
1054 JvmtiVTSuspender::register_all_vthreads_suspend();
1055
1056 // Restore resumed state for threads from except list that were not suspended before.
1057 for (int idx = 0; idx < elist->length(); idx++) {
1058 jthread thread = elist->at(idx);
1059 oop thread_oop = JNIHandles::resolve_external_guard(thread);
1060 if (JvmtiVTSuspender::is_vthread_suspended(thread_oop)) {
1061 JvmtiVTSuspender::register_vthread_resume(thread_oop);
1062 }
1063 }
1064 }
1065 // Self suspend after all other suspends if necessary.
1066 // Do not use JvmtiVTMSTransitionDisabler in context of self suspend to avoid deadlocks.
1067 if (self_tobj() != nullptr) {
1068 suspend_thread(self_tobj(), current, /* single_suspend */ false);
1069 }
1070 return JVMTI_ERROR_NONE;
1071 } /* end SuspendAllVirtualThreads */
1072
1073
1074 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
1075 jvmtiError
1076 JvmtiEnv::ResumeThread(jthread thread) {
1077 JvmtiVTMSTransitionDisabler disabler(true);
1078 JavaThread* current = JavaThread::current();
1079 ThreadsListHandle tlh(current);
1080
1081 JavaThread* java_thread = nullptr;
1082 oop thread_oop = nullptr;
1083 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, current, &java_thread, &thread_oop);
1084 if (err != JVMTI_ERROR_NONE) {
1085 return err;
1086 }
1087 err = resume_thread(thread_oop, java_thread, /* single_resume */ true);
1088 return err;
1089 } /* end ResumeThread */
1090
1091
1092 // request_count - pre-checked to be greater than or equal to 0
1093 // request_list - pre-checked for null
1094 // results - pre-checked for null
1095 jvmtiError
1096 JvmtiEnv::ResumeThreadList(jint request_count, const jthread* request_list, jvmtiError* results) {
1097 oop thread_oop = nullptr;
1098 JavaThread* java_thread = nullptr;
1099 JvmtiVTMSTransitionDisabler disabler(true);
1100 ThreadsListHandle tlh;
1101
1102 for (int i = 0; i < request_count; i++) {
1103 jthread thread = request_list[i];
1104 jvmtiError err = JvmtiExport::cv_external_thread_to_JavaThread(tlh.list(), thread, &java_thread, &thread_oop);
1105
1106 if (thread_oop != nullptr &&
1107 java_lang_VirtualThread::is_instance(thread_oop) &&
1108 !JvmtiEnvBase::is_vthread_alive(thread_oop)) {
1109 err = JVMTI_ERROR_THREAD_NOT_ALIVE;
1110 }
1111 if (err != JVMTI_ERROR_NONE) {
1112 if (thread_oop == nullptr || err != JVMTI_ERROR_INVALID_THREAD) {
1113 results[i] = err;
1114 continue;
1115 }
1116 }
1117 results[i] = resume_thread(thread_oop, java_thread, /* single_resume */ true);
1118 }
1119 // per-thread resume results returned via results parameter
1120 return JVMTI_ERROR_NONE;
1121 } /* end ResumeThreadList */
1122
1123
1124 jvmtiError
1125 JvmtiEnv::ResumeAllVirtualThreads(jint except_count, const jthread* except_list) {
1126 if (get_capabilities()->can_support_virtual_threads == 0) {
1127 return JVMTI_ERROR_MUST_POSSESS_CAPABILITY;
1128 }
1129 jvmtiError err = JvmtiEnvBase::check_thread_list(except_count, except_list);
1130 if (err != JVMTI_ERROR_NONE) {
1131 return err;
1132 }
1133 ResourceMark rm;
1134 JvmtiVTMSTransitionDisabler disabler(true);
1135 GrowableArray<jthread>* elist = new GrowableArray<jthread>(except_count);
1136
1137 // Collect threads from except_list for which suspended status must be restored (only for VirtualThread case)
1138 for (int idx = 0; idx < except_count; idx++) {
1139 jthread thread = except_list[idx];
1140 oop thread_oop = JNIHandles::resolve_external_guard(thread);
1141 if (java_lang_VirtualThread::is_instance(thread_oop) && JvmtiVTSuspender::is_vthread_suspended(thread_oop)) {
1142 // is suspended, so its suspended status must be restored
1143 elist->append(except_list[idx]);
1144 }
1145 }
1146
1147 for (JavaThreadIteratorWithHandle jtiwh; JavaThread *java_thread = jtiwh.next(); ) {
1148 oop vt_oop = java_thread->jvmti_vthread();
1149 if (!java_thread->is_exiting() &&
1150 !java_thread->is_jvmti_agent_thread() &&
1151 !java_thread->is_hidden_from_external_view() &&
1152 vt_oop != nullptr &&
1153 ((java_lang_VirtualThread::is_instance(vt_oop) &&
1154 JvmtiEnvBase::is_vthread_alive(vt_oop) &&
1155 JvmtiVTSuspender::is_vthread_suspended(vt_oop)) ||
1156 (vt_oop->is_a(vmClasses::BoundVirtualThread_klass()) && java_thread->is_suspended())) &&
1157 !is_in_thread_list(except_count, except_list, vt_oop)
1158 ) {
1159 resume_thread(vt_oop, java_thread, /* single_resume */ false);
1160 }
1161 }
1162 JvmtiVTSuspender::register_all_vthreads_resume();
1163
1164 // Restore suspended state for threads from except list that were suspended before.
1165 for (int idx = 0; idx < elist->length(); idx++) {
1166 jthread thread = elist->at(idx);
1167 oop thread_oop = JNIHandles::resolve_external_guard(thread);
1168 if (!JvmtiVTSuspender::is_vthread_suspended(thread_oop)) {
1169 JvmtiVTSuspender::register_vthread_suspend(thread_oop);
1170 }
1171 }
1172 return JVMTI_ERROR_NONE;
1173 } /* end ResumeAllVirtualThreads */
1174
1175
1176 jvmtiError
1177 JvmtiEnv::StopThread(jthread thread, jobject exception) {
1178 JavaThread* current_thread = JavaThread::current();
1179
1180 JvmtiVTMSTransitionDisabler disabler(thread);
1181 ThreadsListHandle tlh(current_thread);
1182 JavaThread* java_thread = nullptr;
1183 oop thread_oop = nullptr;
1184
1185 NULL_CHECK(thread, JVMTI_ERROR_INVALID_THREAD);
1186
1187 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, current_thread, &java_thread, &thread_oop);
1188
1189 bool is_virtual = thread_oop != nullptr && thread_oop->is_a(vmClasses::BaseVirtualThread_klass());
1190
1191 if (is_virtual && !is_JavaThread_current(java_thread, thread_oop)) {
1192 if (!is_vthread_suspended(thread_oop, java_thread)) {
1193 return JVMTI_ERROR_THREAD_NOT_SUSPENDED;
1194 }
1195 if (java_thread == nullptr) { // unmounted virtual thread
1196 return JVMTI_ERROR_OPAQUE_FRAME;
1197 }
1198 }
1199 if (err != JVMTI_ERROR_NONE) {
1200 return err;
1201 }
1202 oop e = JNIHandles::resolve_external_guard(exception);
1203 NULL_CHECK(e, JVMTI_ERROR_NULL_POINTER);
1204
1205 JavaThread::send_async_exception(java_thread, e);
1206
1207 return JVMTI_ERROR_NONE;
1208
1209 } /* end StopThread */
1210
1211
1212 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
1213 jvmtiError
1214 JvmtiEnv::InterruptThread(jthread thread) {
1215 JavaThread* current_thread = JavaThread::current();
1216 HandleMark hm(current_thread);
1217
1218 JvmtiVTMSTransitionDisabler disabler(thread);
1219 ThreadsListHandle tlh(current_thread);
1220
1221 JavaThread* java_thread = nullptr;
1222 oop thread_obj = nullptr;
1223 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, current_thread, &java_thread, &thread_obj);
1224 if (err != JVMTI_ERROR_NONE) {
1225 return err;
1226 }
1227
1228 if (java_lang_VirtualThread::is_instance(thread_obj)) {
1229 // For virtual threads we have to call into Java to interrupt:
1230 Handle obj(current_thread, thread_obj);
1231 JvmtiJavaUpcallMark jjum(current_thread); // hide JVMTI events for Java upcall
1232 JavaValue result(T_VOID);
1233 JavaCalls::call_virtual(&result,
1234 obj,
1235 vmClasses::Thread_klass(),
1236 vmSymbols::interrupt_method_name(),
1237 vmSymbols::void_method_signature(),
1238 current_thread);
1239
1240 return JVMTI_ERROR_NONE;
1241 }
1242
1243 // Really this should be a Java call to Thread.interrupt to ensure the same
1244 // semantics, however historically this has not been done for some reason.
1245 // So we continue with that (which means we don't interact with any Java-level
1246 // Interruptible object) but we must set the Java-level interrupted state.
1247 java_lang_Thread::set_interrupted(thread_obj, true);
1248 java_thread->interrupt();
1249
1250 return JVMTI_ERROR_NONE;
1251 } /* end InterruptThread */
1252
1253
1254 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
1255 // info_ptr - pre-checked for null
1256 jvmtiError
1257 JvmtiEnv::GetThreadInfo(jthread thread, jvmtiThreadInfo* info_ptr) {
1258 JavaThread* current_thread = JavaThread::current();
1259 ResourceMark rm(current_thread);
1260 HandleMark hm(current_thread);
1261 JavaThread* java_thread = nullptr;
1262 oop thread_oop = nullptr;
1263
1264 JvmtiVTMSTransitionDisabler disabler(thread);
1265 ThreadsListHandle tlh(current_thread);
1266
1267 // if thread is null the current thread is used
1268 if (thread == nullptr) {
1269 java_thread = JavaThread::current();
1270 thread_oop = get_vthread_or_thread_oop(java_thread);
1271 if (thread_oop == nullptr || !thread_oop->is_a(vmClasses::Thread_klass())) {
1272 return JVMTI_ERROR_INVALID_THREAD;
1273 }
1274 } else {
1275 jvmtiError err = JvmtiExport::cv_external_thread_to_JavaThread(tlh.list(), thread, &java_thread, &thread_oop);
1276 if (err != JVMTI_ERROR_NONE) {
1277 // We got an error code so we don't have a JavaThread *, but
1278 // only return an error from here if we didn't get a valid
1279 // thread_oop.
1280 // In the virtual thread case the cv_external_thread_to_JavaThread is expected to correctly set
1281 // the thread_oop and return JVMTI_ERROR_INVALID_THREAD which we ignore here.
1282 if (thread_oop == nullptr) {
1283 return err;
1284 }
1285 }
1286 }
1287 // We have a valid thread_oop so we can return some thread info.
1288
1289 Handle thread_obj(current_thread, thread_oop);
1290 Handle name;
1291 ThreadPriority priority;
1292 Handle thread_group;
1293 Handle context_class_loader;
1294 bool is_daemon;
1295
1296 name = Handle(current_thread, java_lang_Thread::name(thread_obj()));
1297
1298 if (java_lang_VirtualThread::is_instance(thread_obj())) {
1299 priority = (ThreadPriority)JVMTI_THREAD_NORM_PRIORITY;
1300 is_daemon = true;
1301 if (java_lang_VirtualThread::state(thread_obj()) == java_lang_VirtualThread::TERMINATED) {
1302 thread_group = Handle(current_thread, nullptr);
1303 } else {
1304 thread_group = Handle(current_thread, java_lang_Thread_Constants::get_VTHREAD_GROUP());
1305 }
1306 } else {
1307 priority = java_lang_Thread::priority(thread_obj());
1308 is_daemon = java_lang_Thread::is_daemon(thread_obj());
1309 if (java_lang_Thread::get_thread_status(thread_obj()) == JavaThreadStatus::TERMINATED) {
1310 thread_group = Handle(current_thread, nullptr);
1311 } else {
1312 thread_group = Handle(current_thread, java_lang_Thread::threadGroup(thread_obj()));
1313 }
1314 }
1315
1316 oop loader = java_lang_Thread::context_class_loader(thread_obj());
1317 context_class_loader = Handle(current_thread, loader);
1318
1319 { const char *n;
1320
1321 if (name() != nullptr) {
1322 n = java_lang_String::as_utf8_string(name());
1323 } else {
1324 size_t utf8_length = 0;
1325 n = UNICODE::as_utf8((jchar*) nullptr, utf8_length);
1326 }
1327
1328 info_ptr->name = (char *) jvmtiMalloc(strlen(n)+1);
1329 if (info_ptr->name == nullptr)
1330 return JVMTI_ERROR_OUT_OF_MEMORY;
1331
1332 strcpy(info_ptr->name, n);
1333 }
1334 info_ptr->is_daemon = is_daemon;
1335 info_ptr->priority = priority;
1336
1337 info_ptr->context_class_loader = (context_class_loader.is_null()) ? nullptr :
1338 jni_reference(context_class_loader);
1339 info_ptr->thread_group = jni_reference(thread_group);
1340
1341 return JVMTI_ERROR_NONE;
1342 } /* end GetThreadInfo */
1343
1344
1345 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
1346 // owned_monitor_count_ptr - pre-checked for null
1347 // owned_monitors_ptr - pre-checked for null
1348 jvmtiError
1349 JvmtiEnv::GetOwnedMonitorInfo(jthread thread, jint* owned_monitor_count_ptr, jobject** owned_monitors_ptr) {
1350 JavaThread* calling_thread = JavaThread::current();
1351 HandleMark hm(calling_thread);
1352
1353 JvmtiVTMSTransitionDisabler disabler(thread);
1354 ThreadsListHandle tlh(calling_thread);
1355
1356 JavaThread* java_thread = nullptr;
1357 oop thread_oop = nullptr;
1358 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, calling_thread, &java_thread, &thread_oop);
1359 if (err != JVMTI_ERROR_NONE) {
1360 return err;
1361 }
1362
1363 if (LockingMode == LM_LEGACY && java_thread == nullptr) {
1364 *owned_monitor_count_ptr = 0;
1365 return JVMTI_ERROR_NONE;
1366 }
1367
1368 // growable array of jvmti monitors info on the C-heap
1369 GrowableArray<jvmtiMonitorStackDepthInfo*> *owned_monitors_list =
1370 new (mtServiceability) GrowableArray<jvmtiMonitorStackDepthInfo*>(1, mtServiceability);
1371
1372 Handle thread_handle(calling_thread, thread_oop);
1373 EscapeBarrier eb(java_thread != nullptr, calling_thread, java_thread);
1374 if (!eb.deoptimize_objects(MaxJavaStackTraceDepth)) {
1375 delete owned_monitors_list;
1376 return JVMTI_ERROR_OUT_OF_MEMORY;
1377 }
1378 // get owned monitors info with handshake
1379 GetOwnedMonitorInfoClosure op(this, calling_thread, owned_monitors_list);
1380 JvmtiHandshake::execute(&op, &tlh, java_thread, thread_handle);
1381 err = op.result();
1382
1383 jint owned_monitor_count = owned_monitors_list->length();
1384 if (err == JVMTI_ERROR_NONE) {
1385 if ((err = allocate(owned_monitor_count * sizeof(jobject *),
1386 (unsigned char**)owned_monitors_ptr)) == JVMTI_ERROR_NONE) {
1387 // copy into the returned array
1388 for (int i = 0; i < owned_monitor_count; i++) {
1389 (*owned_monitors_ptr)[i] =
1390 ((jvmtiMonitorStackDepthInfo*)owned_monitors_list->at(i))->monitor;
1391 }
1392 *owned_monitor_count_ptr = owned_monitor_count;
1393 }
1394 }
1395 // clean up.
1396 for (int i = 0; i < owned_monitor_count; i++) {
1397 deallocate((unsigned char*)owned_monitors_list->at(i));
1398 }
1399 delete owned_monitors_list;
1400
1401 return err;
1402 } /* end GetOwnedMonitorInfo */
1403
1404
1405 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
1406 // monitor_info_count_ptr - pre-checked for null
1407 // monitor_info_ptr - pre-checked for null
1408 jvmtiError
1409 JvmtiEnv::GetOwnedMonitorStackDepthInfo(jthread thread, jint* monitor_info_count_ptr, jvmtiMonitorStackDepthInfo** monitor_info_ptr) {
1410 JavaThread* calling_thread = JavaThread::current();
1411 HandleMark hm(calling_thread);
1412
1413 JvmtiVTMSTransitionDisabler disabler(thread);
1414 ThreadsListHandle tlh(calling_thread);
1415
1416 JavaThread* java_thread = nullptr;
1417 oop thread_oop = nullptr;
1418 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, calling_thread, &java_thread, &thread_oop);
1419 if (err != JVMTI_ERROR_NONE) {
1420 return err;
1421 }
1422
1423 if (LockingMode == LM_LEGACY && java_thread == nullptr) {
1424 *monitor_info_count_ptr = 0;
1425 return JVMTI_ERROR_NONE;
1426 }
1427
1428 // growable array of jvmti monitors info on the C-heap
1429 GrowableArray<jvmtiMonitorStackDepthInfo*> *owned_monitors_list =
1430 new (mtServiceability) GrowableArray<jvmtiMonitorStackDepthInfo*>(1, mtServiceability);
1431
1432 Handle thread_handle(calling_thread, thread_oop);
1433 EscapeBarrier eb(java_thread != nullptr, calling_thread, java_thread);
1434 if (!eb.deoptimize_objects(MaxJavaStackTraceDepth)) {
1435 delete owned_monitors_list;
1436 return JVMTI_ERROR_OUT_OF_MEMORY;
1437 }
1438 // get owned monitors info with handshake
1439 GetOwnedMonitorInfoClosure op(this, calling_thread, owned_monitors_list);
1440 JvmtiHandshake::execute(&op, &tlh, java_thread, thread_handle);
1441 err = op.result();
1442
1443 jint owned_monitor_count = owned_monitors_list->length();
1444 if (err == JVMTI_ERROR_NONE) {
1445 if ((err = allocate(owned_monitor_count * sizeof(jvmtiMonitorStackDepthInfo),
1446 (unsigned char**)monitor_info_ptr)) == JVMTI_ERROR_NONE) {
1447 // copy to output array.
1448 for (int i = 0; i < owned_monitor_count; i++) {
1449 (*monitor_info_ptr)[i].monitor =
1450 ((jvmtiMonitorStackDepthInfo*)owned_monitors_list->at(i))->monitor;
1451 (*monitor_info_ptr)[i].stack_depth =
1452 ((jvmtiMonitorStackDepthInfo*)owned_monitors_list->at(i))->stack_depth;
1453 }
1454 }
1455 *monitor_info_count_ptr = owned_monitor_count;
1456 }
1457
1458 // clean up.
1459 for (int i = 0; i < owned_monitor_count; i++) {
1460 deallocate((unsigned char*)owned_monitors_list->at(i));
1461 }
1462 delete owned_monitors_list;
1463
1464 return err;
1465 } /* end GetOwnedMonitorStackDepthInfo */
1466
1467
1468 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
1469 // monitor_ptr - pre-checked for null
1470 jvmtiError
1471 JvmtiEnv::GetCurrentContendedMonitor(jthread thread, jobject* monitor_ptr) {
1472 JavaThread* current = JavaThread::current();
1473
1474 *monitor_ptr = nullptr;
1475
1476 // get contended monitor information with handshake
1477 GetCurrentContendedMonitorClosure op(this, current, monitor_ptr);
1478 JvmtiHandshake::execute(&op, thread);
1479 return op.result();
1480 } /* end GetCurrentContendedMonitor */
1481
1482
1483 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
1484 // proc - pre-checked for null
1485 // arg - null is a valid value, must be checked
1486 jvmtiError
1487 JvmtiEnv::RunAgentThread(jthread thread, jvmtiStartFunction proc, const void* arg, jint priority) {
1488 JavaThread* current_thread = JavaThread::current();
1489
1490 JavaThread* java_thread = nullptr;
1491 oop thread_oop = nullptr;
1492 ThreadsListHandle tlh(current_thread);
1493 jvmtiError err = JvmtiExport::cv_external_thread_to_JavaThread(tlh.list(), thread, &java_thread, &thread_oop);
1494 if (err != JVMTI_ERROR_NONE) {
1495 // We got an error code so we don't have a JavaThread *, but
1496 // only return an error from here if we didn't get a valid
1497 // thread_oop.
1498 if (thread_oop == nullptr) {
1499 return err;
1500 }
1501 // We have a valid thread_oop.
1502 }
1503
1504 if (thread_oop->is_a(vmClasses::BaseVirtualThread_klass())) {
1505 // No support for virtual threads.
1506 return JVMTI_ERROR_UNSUPPORTED_OPERATION;
1507 }
1508 if (java_thread != nullptr) {
1509 // 'thread' refers to an existing JavaThread.
1510 return JVMTI_ERROR_INVALID_THREAD;
1511 }
1512
1513 if (priority < JVMTI_THREAD_MIN_PRIORITY || priority > JVMTI_THREAD_MAX_PRIORITY) {
1514 return JVMTI_ERROR_INVALID_PRIORITY;
1515 }
1516
1517 Handle thread_hndl(current_thread, thread_oop);
1518
1519 JvmtiAgentThread* new_thread = new JvmtiAgentThread(this, proc, arg);
1520
1521 // At this point it may be possible that no osthread was created for the
1522 // JavaThread due to lack of resources.
1523 if (new_thread->osthread() == nullptr) {
1524 // The new thread is not known to Thread-SMR yet so we can just delete.
1525 delete new_thread;
1526 return JVMTI_ERROR_OUT_OF_MEMORY;
1527 }
1528
1529 JavaThread::start_internal_daemon(current_thread, new_thread, thread_hndl,
1530 (ThreadPriority)priority);
1531
1532 return JVMTI_ERROR_NONE;
1533 } /* end RunAgentThread */
1534
1535 //
1536 // Thread Group functions
1537 //
1538
1539 // group_count_ptr - pre-checked for null
1540 // groups_ptr - pre-checked for null
1541 jvmtiError
1542 JvmtiEnv::GetTopThreadGroups(jint* group_count_ptr, jthreadGroup** groups_ptr) {
1543 JavaThread* current_thread = JavaThread::current();
1544
1545 // Only one top level thread group now.
1546 *group_count_ptr = 1;
1547
1548 // Allocate memory to store global-refs to the thread groups.
1549 // Assume this area is freed by caller.
1550 *groups_ptr = (jthreadGroup *) jvmtiMalloc((sizeof(jthreadGroup)) * (*group_count_ptr));
1551
1552 NULL_CHECK(*groups_ptr, JVMTI_ERROR_OUT_OF_MEMORY);
1553
1554 // Convert oop to Handle, then convert Handle to global-ref.
1555 {
1556 HandleMark hm(current_thread);
1557 Handle system_thread_group(current_thread, Universe::system_thread_group());
1558 *groups_ptr[0] = jni_reference(system_thread_group);
1559 }
1560
1561 return JVMTI_ERROR_NONE;
1562 } /* end GetTopThreadGroups */
1563
1564
1565 // info_ptr - pre-checked for null
1566 jvmtiError
1567 JvmtiEnv::GetThreadGroupInfo(jthreadGroup group, jvmtiThreadGroupInfo* info_ptr) {
1568 Thread* current_thread = Thread::current();
1569 ResourceMark rm(current_thread);
1570 HandleMark hm(current_thread);
1571
1572 Handle group_obj (current_thread, JNIHandles::resolve_external_guard(group));
1573 NULL_CHECK(group_obj(), JVMTI_ERROR_INVALID_THREAD_GROUP);
1574
1575 const char* name;
1576 Handle parent_group;
1577 bool is_daemon;
1578 ThreadPriority max_priority;
1579
1580 name = java_lang_ThreadGroup::name(group_obj());
1581 parent_group = Handle(current_thread, java_lang_ThreadGroup::parent(group_obj()));
1582 is_daemon = java_lang_ThreadGroup::is_daemon(group_obj());
1583 max_priority = java_lang_ThreadGroup::maxPriority(group_obj());
1584
1585 info_ptr->is_daemon = is_daemon;
1586 info_ptr->max_priority = max_priority;
1587 info_ptr->parent = jni_reference(parent_group);
1588
1589 if (name != nullptr) {
1590 info_ptr->name = (char*)jvmtiMalloc(strlen(name)+1);
1591 NULL_CHECK(info_ptr->name, JVMTI_ERROR_OUT_OF_MEMORY);
1592 strcpy(info_ptr->name, name);
1593 } else {
1594 info_ptr->name = nullptr;
1595 }
1596
1597 return JVMTI_ERROR_NONE;
1598 } /* end GetThreadGroupInfo */
1599
1600 // thread_count_ptr - pre-checked for null
1601 // threads_ptr - pre-checked for null
1602 // group_count_ptr - pre-checked for null
1603 // groups_ptr - pre-checked for null
1604 jvmtiError
1605 JvmtiEnv::GetThreadGroupChildren(jthreadGroup group, jint* thread_count_ptr, jthread** threads_ptr, jint* group_count_ptr, jthreadGroup** groups_ptr) {
1606 jvmtiError err;
1607 JavaThread* current_thread = JavaThread::current();
1608 oop group_obj = JNIHandles::resolve_external_guard(group);
1609 NULL_CHECK(group_obj, JVMTI_ERROR_INVALID_THREAD_GROUP);
1610
1611 Handle *thread_objs = nullptr;
1612 objArrayHandle group_objs;
1613 jint nthreads = 0;
1614 jint ngroups = 0;
1615 int hidden_threads = 0;
1616
1617 ResourceMark rm(current_thread);
1618 HandleMark hm(current_thread);
1619
1620 Handle group_hdl(current_thread, group_obj);
1621
1622 err = get_live_threads(current_thread, group_hdl, &nthreads, &thread_objs);
1623 if (err != JVMTI_ERROR_NONE) {
1624 return err;
1625 }
1626 err = get_subgroups(current_thread, group_hdl, &ngroups, &group_objs);
1627 if (err != JVMTI_ERROR_NONE) {
1628 return err;
1629 }
1630
1631 *group_count_ptr = ngroups;
1632 *thread_count_ptr = nthreads;
1633 *threads_ptr = new_jthreadArray(nthreads, thread_objs);
1634 *groups_ptr = new_jthreadGroupArray(ngroups, group_objs);
1635 if (nthreads > 0 && *threads_ptr == nullptr) {
1636 return JVMTI_ERROR_OUT_OF_MEMORY;
1637 }
1638 if (ngroups > 0 && *groups_ptr == nullptr) {
1639 return JVMTI_ERROR_OUT_OF_MEMORY;
1640 }
1641
1642 return JVMTI_ERROR_NONE;
1643 } /* end GetThreadGroupChildren */
1644
1645
1646 //
1647 // Stack Frame functions
1648 //
1649
1650 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
1651 // max_frame_count - pre-checked to be greater than or equal to 0
1652 // frame_buffer - pre-checked for null
1653 // count_ptr - pre-checked for null
1654 jvmtiError
1655 JvmtiEnv::GetStackTrace(jthread thread, jint start_depth, jint max_frame_count, jvmtiFrameInfo* frame_buffer, jint* count_ptr) {
1656 GetStackTraceClosure op(this, start_depth, max_frame_count, frame_buffer, count_ptr);
1657 JvmtiHandshake::execute(&op, thread);
1658 return op.result();
1659 } /* end GetStackTrace */
1660
1661
1662 // max_frame_count - pre-checked to be greater than or equal to 0
1663 // stack_info_ptr - pre-checked for null
1664 // thread_count_ptr - pre-checked for null
1665 jvmtiError
1666 JvmtiEnv::GetAllStackTraces(jint max_frame_count, jvmtiStackInfo** stack_info_ptr, jint* thread_count_ptr) {
1667 jvmtiError err = JVMTI_ERROR_NONE;
1668 JavaThread* calling_thread = JavaThread::current();
1669
1670 // JVMTI get stack traces at safepoint.
1671 VM_GetAllStackTraces op(this, calling_thread, max_frame_count);
1672 VMThread::execute(&op);
1673 *thread_count_ptr = op.final_thread_count();
1674 *stack_info_ptr = op.stack_info();
1675 err = op.result();
1676 return err;
1677 } /* end GetAllStackTraces */
1678
1679
1680 // thread_count - pre-checked to be greater than or equal to 0
1681 // thread_list - pre-checked for null
1682 // max_frame_count - pre-checked to be greater than or equal to 0
1683 // stack_info_ptr - pre-checked for null
1684 jvmtiError
1685 JvmtiEnv::GetThreadListStackTraces(jint thread_count, const jthread* thread_list, jint max_frame_count, jvmtiStackInfo** stack_info_ptr) {
1686 jvmtiError err = JVMTI_ERROR_NONE;
1687
1688 if (thread_count == 1) {
1689 // Use direct handshake if we need to get only one stack trace.
1690 JavaThread *current_thread = JavaThread::current();
1691
1692 jthread thread = thread_list[0];
1693
1694 GetSingleStackTraceClosure op(this, current_thread, thread, max_frame_count);
1695 JvmtiHandshake::execute(&op, thread);
1696 err = op.result();
1697 if (err == JVMTI_ERROR_NONE) {
1698 *stack_info_ptr = op.stack_info();
1699 }
1700 } else {
1701 JvmtiVTMSTransitionDisabler disabler;
1702
1703 // JVMTI get stack traces at safepoint.
1704 VM_GetThreadListStackTraces op(this, thread_count, thread_list, max_frame_count);
1705 VMThread::execute(&op);
1706 err = op.result();
1707 if (err == JVMTI_ERROR_NONE) {
1708 *stack_info_ptr = op.stack_info();
1709 }
1710 }
1711 return err;
1712 } /* end GetThreadListStackTraces */
1713
1714
1715 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
1716 // count_ptr - pre-checked for null
1717 jvmtiError
1718 JvmtiEnv::GetFrameCount(jthread thread, jint* count_ptr) {
1719 GetFrameCountClosure op(this, count_ptr);
1720 JvmtiHandshake::execute(&op, thread);
1721 return op.result();
1722 } /* end GetFrameCount */
1723
1724
1725 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
1726 jvmtiError
1727 JvmtiEnv::PopFrame(jthread thread) {
1728 JavaThread* current_thread = JavaThread::current();
1729 HandleMark hm(current_thread);
1730
1731 if (thread == nullptr) {
1732 return JVMTI_ERROR_INVALID_THREAD;
1733 }
1734 JvmtiVTMSTransitionDisabler disabler(thread);
1735 ThreadsListHandle tlh(current_thread);
1736
1737 JavaThread* java_thread = nullptr;
1738 oop thread_obj = nullptr;
1739 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, current_thread, &java_thread, &thread_obj);
1740 Handle thread_handle(current_thread, thread_obj);
1741
1742 if (err != JVMTI_ERROR_NONE) {
1743 return err;
1744 }
1745 bool self = java_thread == current_thread;
1746
1747 err = check_non_suspended_or_opaque_frame(java_thread, thread_obj, self);
1748 if (err != JVMTI_ERROR_NONE) {
1749 return err;
1750 }
1751
1752 // retrieve or create the state
1753 JvmtiThreadState* state = JvmtiThreadState::state_for(java_thread);
1754 if (state == nullptr) {
1755 return JVMTI_ERROR_THREAD_NOT_ALIVE;
1756 }
1757
1758 // Eagerly reallocate scalar replaced objects.
1759 EscapeBarrier eb(true, current_thread, java_thread);
1760 if (!eb.deoptimize_objects(1)) {
1761 // Reallocation of scalar replaced objects failed -> return with error
1762 return JVMTI_ERROR_OUT_OF_MEMORY;
1763 }
1764
1765 MutexLocker mu(JvmtiThreadState_lock);
1766 UpdateForPopTopFrameClosure op(state);
1767 JvmtiHandshake::execute(&op, &tlh, java_thread, thread_handle);
1768 return op.result();
1769 } /* end PopFrame */
1770
1771
1772 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
1773 // depth - pre-checked as non-negative
1774 // method_ptr - pre-checked for null
1775 // location_ptr - pre-checked for null
1776 jvmtiError
1777 JvmtiEnv::GetFrameLocation(jthread thread, jint depth, jmethodID* method_ptr, jlocation* location_ptr) {
1778 GetFrameLocationClosure op(this, depth, method_ptr, location_ptr);
1779 JvmtiHandshake::execute(&op, thread);
1780 return op.result();
1781 } /* end GetFrameLocation */
1782
1783
1784 // Threads_lock NOT held, java_thread not protected by lock
1785 // depth - pre-checked as non-negative
1786 jvmtiError
1787 JvmtiEnv::NotifyFramePop(jthread thread, jint depth) {
1788 ResourceMark rm;
1789 JvmtiVTMSTransitionDisabler disabler(thread);
1790 JavaThread* current = JavaThread::current();
1791 ThreadsListHandle tlh(current);
1792
1793 JavaThread* java_thread = nullptr;
1794 oop thread_obj = nullptr;
1795 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, current, &java_thread, &thread_obj);
1796 if (err != JVMTI_ERROR_NONE) {
1797 return err;
1798 }
1799
1800 HandleMark hm(current);
1801 Handle thread_handle(current, thread_obj);
1802 JvmtiThreadState *state = JvmtiThreadState::state_for(java_thread, thread_handle);
1803 if (state == nullptr) {
1804 return JVMTI_ERROR_THREAD_NOT_ALIVE;
1805 }
1806
1807 SetOrClearFramePopClosure op(this, state, true /* set */, depth);
1808 MutexLocker mu(current, JvmtiThreadState_lock);
1809 JvmtiHandshake::execute(&op, &tlh, java_thread, thread_handle);
1810 return op.result();
1811 } /* end NotifyFramePop */
1812
1813 // Threads_lock NOT held, java_thread not protected by lock
1814 jvmtiError
1815 JvmtiEnv::ClearAllFramePops(jthread thread) {
1816 ResourceMark rm;
1817 JvmtiVTMSTransitionDisabler disabler(thread);
1818 JavaThread* current = JavaThread::current();
1819 ThreadsListHandle tlh(current);
1820
1821 JavaThread* java_thread = nullptr;
1822 oop thread_obj = nullptr;
1823 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, current, &java_thread, &thread_obj);
1824 if (err != JVMTI_ERROR_NONE) {
1825 return err;
1826 }
1827
1828 HandleMark hm(current);
1829 Handle thread_handle(current, thread_obj);
1830 JvmtiThreadState *state = JvmtiThreadState::state_for(java_thread, thread_handle);
1831 if (state == nullptr) {
1832 return JVMTI_ERROR_THREAD_NOT_ALIVE;
1833 }
1834
1835 SetOrClearFramePopClosure op(this, state, false /* clear all frame pops*/);
1836 MutexLocker mu(current, JvmtiThreadState_lock);
1837 JvmtiHandshake::execute(&op, &tlh, java_thread, thread_handle);
1838 return op.result();
1839 } /* end ClearAllFramePops */
1840
1841 //
1842 // Force Early Return functions
1843 //
1844
1845 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
1846 jvmtiError
1847 JvmtiEnv::ForceEarlyReturnObject(jthread thread, jobject value) {
1848 jvalue val;
1849 val.l = value;
1850 return force_early_return(thread, val, atos);
1851 } /* end ForceEarlyReturnObject */
1852
1853
1854 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
1855 jvmtiError
1856 JvmtiEnv::ForceEarlyReturnInt(jthread thread, jint value) {
1857 jvalue val;
1858 val.i = value;
1859 return force_early_return(thread, val, itos);
1860 } /* end ForceEarlyReturnInt */
1861
1862
1863 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
1864 jvmtiError
1865 JvmtiEnv::ForceEarlyReturnLong(jthread thread, jlong value) {
1866 jvalue val;
1867 val.j = value;
1868 return force_early_return(thread, val, ltos);
1869 } /* end ForceEarlyReturnLong */
1870
1871
1872 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
1873 jvmtiError
1874 JvmtiEnv::ForceEarlyReturnFloat(jthread thread, jfloat value) {
1875 jvalue val;
1876 val.f = value;
1877 return force_early_return(thread, val, ftos);
1878 } /* end ForceEarlyReturnFloat */
1879
1880
1881 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
1882 jvmtiError
1883 JvmtiEnv::ForceEarlyReturnDouble(jthread thread, jdouble value) {
1884 jvalue val;
1885 val.d = value;
1886 return force_early_return(thread, val, dtos);
1887 } /* end ForceEarlyReturnDouble */
1888
1889
1890 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
1891 jvmtiError
1892 JvmtiEnv::ForceEarlyReturnVoid(jthread thread) {
1893 jvalue val;
1894 val.j = 0L;
1895 return force_early_return(thread, val, vtos);
1896 } /* end ForceEarlyReturnVoid */
1897
1898
1899 //
1900 // Heap functions
1901 //
1902
1903 // klass - null is a valid value, must be checked
1904 // initial_object - null is a valid value, must be checked
1905 // callbacks - pre-checked for null
1906 // user_data - null is a valid value, must be checked
1907 jvmtiError
1908 JvmtiEnv::FollowReferences(jint heap_filter, jclass klass, jobject initial_object, const jvmtiHeapCallbacks* callbacks, const void* user_data) {
1909 // check klass if provided
1910 Klass* k = nullptr;
1911 if (klass != nullptr) {
1912 oop k_mirror = JNIHandles::resolve_external_guard(klass);
1913 if (k_mirror == nullptr) {
1914 return JVMTI_ERROR_INVALID_CLASS;
1915 }
1916 if (java_lang_Class::is_primitive(k_mirror)) {
1917 return JVMTI_ERROR_NONE;
1918 }
1919 k = java_lang_Class::as_Klass(k_mirror);
1920 if (klass == nullptr) {
1921 return JVMTI_ERROR_INVALID_CLASS;
1922 }
1923 }
1924
1925 if (initial_object != nullptr) {
1926 oop init_obj = JNIHandles::resolve_external_guard(initial_object);
1927 if (init_obj == nullptr) {
1928 return JVMTI_ERROR_INVALID_OBJECT;
1929 }
1930 }
1931
1932 Thread *thread = Thread::current();
1933 HandleMark hm(thread);
1934
1935 TraceTime t("FollowReferences", TRACETIME_LOG(Debug, jvmti, objecttagging));
1936 JvmtiTagMap::tag_map_for(this)->follow_references(heap_filter, k, initial_object, callbacks, user_data);
1937 return JVMTI_ERROR_NONE;
1938 } /* end FollowReferences */
1939
1940
1941 // klass - null is a valid value, must be checked
1942 // callbacks - pre-checked for null
1943 // user_data - null is a valid value, must be checked
1944 jvmtiError
1945 JvmtiEnv::IterateThroughHeap(jint heap_filter, jclass klass, const jvmtiHeapCallbacks* callbacks, const void* user_data) {
1946 // check klass if provided
1947 Klass* k = nullptr;
1948 if (klass != nullptr) {
1949 oop k_mirror = JNIHandles::resolve_external_guard(klass);
1950 if (k_mirror == nullptr) {
1951 return JVMTI_ERROR_INVALID_CLASS;
1952 }
1953 if (java_lang_Class::is_primitive(k_mirror)) {
1954 return JVMTI_ERROR_NONE;
1955 }
1956 k = java_lang_Class::as_Klass(k_mirror);
1957 if (k == nullptr) {
1958 return JVMTI_ERROR_INVALID_CLASS;
1959 }
1960 }
1961
1962 TraceTime t("IterateThroughHeap", TRACETIME_LOG(Debug, jvmti, objecttagging));
1963 JvmtiTagMap::tag_map_for(this)->iterate_through_heap(heap_filter, k, callbacks, user_data);
1964 return JVMTI_ERROR_NONE;
1965 } /* end IterateThroughHeap */
1966
1967
1968 // tag_ptr - pre-checked for null
1969 jvmtiError
1970 JvmtiEnv::GetTag(jobject object, jlong* tag_ptr) {
1971 oop o = JNIHandles::resolve_external_guard(object);
1972 NULL_CHECK(o, JVMTI_ERROR_INVALID_OBJECT);
1973 *tag_ptr = JvmtiTagMap::tag_map_for(this)->get_tag(object);
1974 return JVMTI_ERROR_NONE;
1975 } /* end GetTag */
1976
1977
1978 jvmtiError
1979 JvmtiEnv::SetTag(jobject object, jlong tag) {
1980 oop o = JNIHandles::resolve_external_guard(object);
1981 NULL_CHECK(o, JVMTI_ERROR_INVALID_OBJECT);
1982 JvmtiTagMap::tag_map_for(this)->set_tag(object, tag);
1983 return JVMTI_ERROR_NONE;
1984 } /* end SetTag */
1985
1986
1987 // tag_count - pre-checked to be greater than or equal to 0
1988 // tags - pre-checked for null
1989 // count_ptr - pre-checked for null
1990 // object_result_ptr - null is a valid value, must be checked
1991 // tag_result_ptr - null is a valid value, must be checked
1992 jvmtiError
1993 JvmtiEnv::GetObjectsWithTags(jint tag_count, const jlong* tags, jint* count_ptr, jobject** object_result_ptr, jlong** tag_result_ptr) {
1994 TraceTime t("GetObjectsWithTags", TRACETIME_LOG(Debug, jvmti, objecttagging));
1995 return JvmtiTagMap::tag_map_for(this)->get_objects_with_tags((jlong*)tags, tag_count, count_ptr, object_result_ptr, tag_result_ptr);
1996 } /* end GetObjectsWithTags */
1997
1998
1999 jvmtiError
2000 JvmtiEnv::ForceGarbageCollection() {
2001 Universe::heap()->collect(GCCause::_jvmti_force_gc);
2002 return JVMTI_ERROR_NONE;
2003 } /* end ForceGarbageCollection */
2004
2005
2006 //
2007 // Heap (1.0) functions
2008 //
2009
2010 // object_reference_callback - pre-checked for null
2011 // user_data - null is a valid value, must be checked
2012 jvmtiError
2013 JvmtiEnv::IterateOverObjectsReachableFromObject(jobject object, jvmtiObjectReferenceCallback object_reference_callback, const void* user_data) {
2014 oop o = JNIHandles::resolve_external_guard(object);
2015 NULL_CHECK(o, JVMTI_ERROR_INVALID_OBJECT);
2016 JvmtiTagMap::tag_map_for(this)->iterate_over_objects_reachable_from_object(object, object_reference_callback, user_data);
2017 return JVMTI_ERROR_NONE;
2018 } /* end IterateOverObjectsReachableFromObject */
2019
2020
2021 // heap_root_callback - null is a valid value, must be checked
2022 // stack_ref_callback - null is a valid value, must be checked
2023 // object_ref_callback - null is a valid value, must be checked
2024 // user_data - null is a valid value, must be checked
2025 jvmtiError
2026 JvmtiEnv::IterateOverReachableObjects(jvmtiHeapRootCallback heap_root_callback, jvmtiStackReferenceCallback stack_ref_callback, jvmtiObjectReferenceCallback object_ref_callback, const void* user_data) {
2027 TraceTime t("IterateOverReachableObjects", TRACETIME_LOG(Debug, jvmti, objecttagging));
2028 JvmtiTagMap::tag_map_for(this)->iterate_over_reachable_objects(heap_root_callback, stack_ref_callback, object_ref_callback, user_data);
2029 return JVMTI_ERROR_NONE;
2030 } /* end IterateOverReachableObjects */
2031
2032
2033 // heap_object_callback - pre-checked for null
2034 // user_data - null is a valid value, must be checked
2035 jvmtiError
2036 JvmtiEnv::IterateOverHeap(jvmtiHeapObjectFilter object_filter, jvmtiHeapObjectCallback heap_object_callback, const void* user_data) {
2037 TraceTime t("IterateOverHeap", TRACETIME_LOG(Debug, jvmti, objecttagging));
2038 Thread *thread = Thread::current();
2039 HandleMark hm(thread);
2040 JvmtiTagMap::tag_map_for(this)->iterate_over_heap(object_filter, nullptr, heap_object_callback, user_data);
2041 return JVMTI_ERROR_NONE;
2042 } /* end IterateOverHeap */
2043
2044
2045 // k_mirror - may be primitive, this must be checked
2046 // heap_object_callback - pre-checked for null
2047 // user_data - null is a valid value, must be checked
2048 jvmtiError
2049 JvmtiEnv::IterateOverInstancesOfClass(oop k_mirror, jvmtiHeapObjectFilter object_filter, jvmtiHeapObjectCallback heap_object_callback, const void* user_data) {
2050 if (java_lang_Class::is_primitive(k_mirror)) {
2051 // DO PRIMITIVE CLASS PROCESSING
2052 return JVMTI_ERROR_NONE;
2053 }
2054 Klass* klass = java_lang_Class::as_Klass(k_mirror);
2055 if (klass == nullptr) {
2056 return JVMTI_ERROR_INVALID_CLASS;
2057 }
2058 TraceTime t("IterateOverInstancesOfClass", TRACETIME_LOG(Debug, jvmti, objecttagging));
2059 JvmtiTagMap::tag_map_for(this)->iterate_over_heap(object_filter, klass, heap_object_callback, user_data);
2060 return JVMTI_ERROR_NONE;
2061 } /* end IterateOverInstancesOfClass */
2062
2063
2064 //
2065 // Local Variable functions
2066 //
2067
2068 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
2069 // depth - pre-checked as non-negative
2070 // value_ptr - pre-checked for null
2071 jvmtiError
2072 JvmtiEnv::GetLocalObject(jthread thread, jint depth, jint slot, jobject* value_ptr) {
2073 JavaThread* current_thread = JavaThread::current();
2074 // rm object is created to clean up the javaVFrame created in
2075 // doit_prologue(), but after doit() is finished with it.
2076 ResourceMark rm(current_thread);
2077 HandleMark hm(current_thread);
2078 JvmtiVTMSTransitionDisabler disabler(thread);
2079 ThreadsListHandle tlh(current_thread);
2080
2081 JavaThread* java_thread = nullptr;
2082 oop thread_obj = nullptr;
2083 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, current_thread, &java_thread, &thread_obj);
2084 if (err != JVMTI_ERROR_NONE) {
2085 return err;
2086 }
2087 bool self = is_JavaThread_current(java_thread, thread_obj);
2088
2089 if (java_lang_VirtualThread::is_instance(thread_obj)) {
2090 VM_VirtualThreadGetOrSetLocal op(this, Handle(current_thread, thread_obj),
2091 current_thread, depth, slot, self);
2092 VMThread::execute(&op);
2093 err = op.result();
2094 if (err == JVMTI_ERROR_NONE) {
2095 *value_ptr = op.value().l;
2096 }
2097 } else {
2098 // Support for ordinary threads
2099 VM_GetOrSetLocal op(java_thread, current_thread, depth, slot, self);
2100 VMThread::execute(&op);
2101 err = op.result();
2102 if (err == JVMTI_ERROR_NONE) {
2103 *value_ptr = op.value().l;
2104 }
2105 }
2106 return err;
2107 } /* end GetLocalObject */
2108
2109 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
2110 // depth - pre-checked as non-negative
2111 // value - pre-checked for null
2112 jvmtiError
2113 JvmtiEnv::GetLocalInstance(jthread thread, jint depth, jobject* value_ptr){
2114 JavaThread* current_thread = JavaThread::current();
2115 // rm object is created to clean up the javaVFrame created in
2116 // doit_prologue(), but after doit() is finished with it.
2117 ResourceMark rm(current_thread);
2118 HandleMark hm(current_thread);
2119 JvmtiVTMSTransitionDisabler disabler(thread);
2120 ThreadsListHandle tlh(current_thread);
2121
2122 JavaThread* java_thread = nullptr;
2123 oop thread_obj = nullptr;
2124 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, current_thread, &java_thread, &thread_obj);
2125 if (err != JVMTI_ERROR_NONE) {
2126 return err;
2127 }
2128 bool self = is_JavaThread_current(java_thread, thread_obj);
2129
2130 if (java_lang_VirtualThread::is_instance(thread_obj)) {
2131 VM_VirtualThreadGetReceiver op(this, Handle(current_thread, thread_obj),
2132 current_thread, depth, self);
2133 VMThread::execute(&op);
2134 err = op.result();
2135 if (err == JVMTI_ERROR_NONE) {
2136 *value_ptr = op.value().l;
2137 }
2138 } else {
2139 // Support for ordinary threads
2140 VM_GetReceiver op(java_thread, current_thread, depth, self);
2141 VMThread::execute(&op);
2142 err = op.result();
2143 if (err == JVMTI_ERROR_NONE) {
2144 *value_ptr = op.value().l;
2145 }
2146 }
2147 return err;
2148 } /* end GetLocalInstance */
2149
2150
2151 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
2152 // depth - pre-checked as non-negative
2153 // value_ptr - pre-checked for null
2154 jvmtiError
2155 JvmtiEnv::GetLocalInt(jthread thread, jint depth, jint slot, jint* value_ptr) {
2156 JavaThread* current_thread = JavaThread::current();
2157 // rm object is created to clean up the javaVFrame created in
2158 // doit_prologue(), but after doit() is finished with it.
2159 ResourceMark rm(current_thread);
2160 HandleMark hm(current_thread);
2161 JvmtiVTMSTransitionDisabler disabler(thread);
2162 ThreadsListHandle tlh(current_thread);
2163
2164 JavaThread* java_thread = nullptr;
2165 oop thread_obj = nullptr;
2166 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, current_thread, &java_thread, &thread_obj);
2167 if (err != JVMTI_ERROR_NONE) {
2168 return err;
2169 }
2170 bool self = is_JavaThread_current(java_thread, thread_obj);
2171
2172 if (java_lang_VirtualThread::is_instance(thread_obj)) {
2173 VM_VirtualThreadGetOrSetLocal op(this, Handle(current_thread, thread_obj),
2174 depth, slot, T_INT, self);
2175 VMThread::execute(&op);
2176 err = op.result();
2177 if (err == JVMTI_ERROR_NONE) {
2178 *value_ptr = op.value().i;
2179 }
2180 } else {
2181 // Support for ordinary threads
2182 VM_GetOrSetLocal op(java_thread, depth, slot, T_INT, self);
2183 VMThread::execute(&op);
2184 err = op.result();
2185 if (err == JVMTI_ERROR_NONE) {
2186 *value_ptr = op.value().i;
2187 }
2188 }
2189 return err;
2190 } /* end GetLocalInt */
2191
2192
2193 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
2194 // depth - pre-checked as non-negative
2195 // value_ptr - pre-checked for null
2196 jvmtiError
2197 JvmtiEnv::GetLocalLong(jthread thread, jint depth, jint slot, jlong* value_ptr) {
2198 JavaThread* current_thread = JavaThread::current();
2199 // rm object is created to clean up the javaVFrame created in
2200 // doit_prologue(), but after doit() is finished with it.
2201 ResourceMark rm(current_thread);
2202 HandleMark hm(current_thread);
2203 JvmtiVTMSTransitionDisabler disabler(thread);
2204 ThreadsListHandle tlh(current_thread);
2205
2206 JavaThread* java_thread = nullptr;
2207 oop thread_obj = nullptr;
2208 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, current_thread, &java_thread, &thread_obj);
2209 if (err != JVMTI_ERROR_NONE) {
2210 return err;
2211 }
2212 bool self = is_JavaThread_current(java_thread, thread_obj);
2213
2214 if (java_lang_VirtualThread::is_instance(thread_obj)) {
2215 VM_VirtualThreadGetOrSetLocal op(this, Handle(current_thread, thread_obj),
2216 depth, slot, T_LONG, self);
2217 VMThread::execute(&op);
2218 err = op.result();
2219 if (err == JVMTI_ERROR_NONE) {
2220 *value_ptr = op.value().j;
2221 }
2222 } else {
2223 // Support for ordinary threads
2224 VM_GetOrSetLocal op(java_thread, depth, slot, T_LONG, self);
2225 VMThread::execute(&op);
2226 err = op.result();
2227 if (err == JVMTI_ERROR_NONE) {
2228 *value_ptr = op.value().j;
2229 }
2230 }
2231 return err;
2232 } /* end GetLocalLong */
2233
2234
2235 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
2236 // depth - pre-checked as non-negative
2237 // value_ptr - pre-checked for null
2238 jvmtiError
2239 JvmtiEnv::GetLocalFloat(jthread thread, jint depth, jint slot, jfloat* value_ptr) {
2240 JavaThread* current_thread = JavaThread::current();
2241 // rm object is created to clean up the javaVFrame created in
2242 // doit_prologue(), but after doit() is finished with it.
2243 ResourceMark rm(current_thread);
2244 HandleMark hm(current_thread);
2245 JvmtiVTMSTransitionDisabler disabler(thread);
2246 ThreadsListHandle tlh(current_thread);
2247
2248 JavaThread* java_thread = nullptr;
2249 oop thread_obj = nullptr;
2250 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, current_thread, &java_thread, &thread_obj);
2251 if (err != JVMTI_ERROR_NONE) {
2252 return err;
2253 }
2254 bool self = is_JavaThread_current(java_thread, thread_obj);
2255
2256 if (java_lang_VirtualThread::is_instance(thread_obj)) {
2257 VM_VirtualThreadGetOrSetLocal op(this, Handle(current_thread, thread_obj),
2258 depth, slot, T_FLOAT, self);
2259 VMThread::execute(&op);
2260 err = op.result();
2261 if (err == JVMTI_ERROR_NONE) {
2262 *value_ptr = op.value().f;
2263 }
2264 } else {
2265 // Support for ordinary threads
2266 VM_GetOrSetLocal op(java_thread, depth, slot, T_FLOAT, self);
2267 VMThread::execute(&op);
2268 err = op.result();
2269 if (err == JVMTI_ERROR_NONE) {
2270 *value_ptr = op.value().f;
2271 }
2272 }
2273 return err;
2274 } /* end GetLocalFloat */
2275
2276
2277 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
2278 // depth - pre-checked as non-negative
2279 // value_ptr - pre-checked for null
2280 jvmtiError
2281 JvmtiEnv::GetLocalDouble(jthread thread, jint depth, jint slot, jdouble* value_ptr) {
2282 JavaThread* current_thread = JavaThread::current();
2283 // rm object is created to clean up the javaVFrame created in
2284 // doit_prologue(), but after doit() is finished with it.
2285 ResourceMark rm(current_thread);
2286 HandleMark hm(current_thread);
2287 JvmtiVTMSTransitionDisabler disabler(thread);
2288 ThreadsListHandle tlh(current_thread);
2289
2290 JavaThread* java_thread = nullptr;
2291 oop thread_obj = nullptr;
2292 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, current_thread, &java_thread, &thread_obj);
2293 if (err != JVMTI_ERROR_NONE) {
2294 return err;
2295 }
2296 bool self = is_JavaThread_current(java_thread, thread_obj);
2297
2298 if (java_lang_VirtualThread::is_instance(thread_obj)) {
2299 VM_VirtualThreadGetOrSetLocal op(this, Handle(current_thread, thread_obj),
2300 depth, slot, T_DOUBLE, self);
2301 VMThread::execute(&op);
2302 err = op.result();
2303 if (err == JVMTI_ERROR_NONE) {
2304 *value_ptr = op.value().d;
2305 }
2306 } else {
2307 // Support for ordinary threads
2308 VM_GetOrSetLocal op(java_thread, depth, slot, T_DOUBLE, self);
2309 VMThread::execute(&op);
2310 err = op.result();
2311 if (err == JVMTI_ERROR_NONE) {
2312 *value_ptr = op.value().d;
2313 }
2314 }
2315 return err;
2316 } /* end GetLocalDouble */
2317
2318
2319 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
2320 // depth - pre-checked as non-negative
2321 jvmtiError
2322 JvmtiEnv::SetLocalObject(jthread thread, jint depth, jint slot, jobject value) {
2323 JavaThread* current_thread = JavaThread::current();
2324 // rm object is created to clean up the javaVFrame created in
2325 // doit_prologue(), but after doit() is finished with it.
2326 ResourceMark rm(current_thread);
2327 HandleMark hm(current_thread);
2328 JvmtiVTMSTransitionDisabler disabler(thread);
2329 ThreadsListHandle tlh(current_thread);
2330
2331 JavaThread* java_thread = nullptr;
2332 oop thread_obj = nullptr;
2333 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, current_thread, &java_thread, &thread_obj);
2334 if (err != JVMTI_ERROR_NONE) {
2335 return err;
2336 }
2337 bool self = is_JavaThread_current(java_thread, thread_obj);
2338 jvalue val;
2339 val.l = value;
2340
2341 if (java_lang_VirtualThread::is_instance(thread_obj)) {
2342 VM_VirtualThreadGetOrSetLocal op(this, Handle(current_thread, thread_obj),
2343 depth, slot, T_OBJECT, val, self);
2344 VMThread::execute(&op);
2345 err = op.result();
2346 } else {
2347 // Support for ordinary threads
2348 VM_GetOrSetLocal op(java_thread, depth, slot, T_OBJECT, val, self);
2349 VMThread::execute(&op);
2350 err = op.result();
2351 }
2352 return err;
2353 } /* end SetLocalObject */
2354
2355
2356 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
2357 // depth - pre-checked as non-negative
2358 jvmtiError
2359 JvmtiEnv::SetLocalInt(jthread thread, jint depth, jint slot, jint value) {
2360 JavaThread* current_thread = JavaThread::current();
2361 // rm object is created to clean up the javaVFrame created in
2362 // doit_prologue(), but after doit() is finished with it.
2363 ResourceMark rm(current_thread);
2364 HandleMark hm(current_thread);
2365 JvmtiVTMSTransitionDisabler disabler(thread);
2366 ThreadsListHandle tlh(current_thread);
2367
2368 JavaThread* java_thread = nullptr;
2369 oop thread_obj = nullptr;
2370 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, current_thread, &java_thread, &thread_obj);
2371 if (err != JVMTI_ERROR_NONE) {
2372 return err;
2373 }
2374 bool self = is_JavaThread_current(java_thread, thread_obj);
2375 jvalue val;
2376 val.i = value;
2377
2378 if (java_lang_VirtualThread::is_instance(thread_obj)) {
2379 VM_VirtualThreadGetOrSetLocal op(this, Handle(current_thread, thread_obj),
2380 depth, slot, T_INT, val, self);
2381 VMThread::execute(&op);
2382 err = op.result();
2383 } else {
2384 // Support for ordinary threads
2385 VM_GetOrSetLocal op(java_thread, depth, slot, T_INT, val, self);
2386 VMThread::execute(&op);
2387 err = op.result();
2388 }
2389 return err;
2390 } /* end SetLocalInt */
2391
2392
2393 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
2394 // depth - pre-checked as non-negative
2395 jvmtiError
2396 JvmtiEnv::SetLocalLong(jthread thread, jint depth, jint slot, jlong value) {
2397 JavaThread* current_thread = JavaThread::current();
2398 // rm object is created to clean up the javaVFrame created in
2399 // doit_prologue(), but after doit() is finished with it.
2400 ResourceMark rm(current_thread);
2401 HandleMark hm(current_thread);
2402 JvmtiVTMSTransitionDisabler disabler(thread);
2403 ThreadsListHandle tlh(current_thread);
2404
2405 JavaThread* java_thread = nullptr;
2406 oop thread_obj = nullptr;
2407 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, current_thread, &java_thread, &thread_obj);
2408 if (err != JVMTI_ERROR_NONE) {
2409 return err;
2410 }
2411 bool self = is_JavaThread_current(java_thread, thread_obj);
2412 jvalue val;
2413 val.j = value;
2414
2415 if (java_lang_VirtualThread::is_instance(thread_obj)) {
2416 VM_VirtualThreadGetOrSetLocal op(this, Handle(current_thread, thread_obj),
2417 depth, slot, T_LONG, val, self);
2418 VMThread::execute(&op);
2419 err = op.result();
2420 } else {
2421 // Support for ordinary threads
2422 VM_GetOrSetLocal op(java_thread, depth, slot, T_LONG, val, self);
2423 VMThread::execute(&op);
2424 err = op.result();
2425 }
2426 return err;
2427 } /* end SetLocalLong */
2428
2429
2430 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
2431 // depth - pre-checked as non-negative
2432 jvmtiError
2433 JvmtiEnv::SetLocalFloat(jthread thread, jint depth, jint slot, jfloat value) {
2434 JavaThread* current_thread = JavaThread::current();
2435 // rm object is created to clean up the javaVFrame created in
2436 // doit_prologue(), but after doit() is finished with it.
2437 ResourceMark rm(current_thread);
2438 HandleMark hm(current_thread);
2439 JvmtiVTMSTransitionDisabler disabler(thread);
2440 ThreadsListHandle tlh(current_thread);
2441
2442 JavaThread* java_thread = nullptr;
2443 oop thread_obj = nullptr;
2444 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, current_thread, &java_thread, &thread_obj);
2445 if (err != JVMTI_ERROR_NONE) {
2446 return err;
2447 }
2448 bool self = is_JavaThread_current(java_thread, thread_obj);
2449 jvalue val;
2450 val.f = value;
2451
2452 if (java_lang_VirtualThread::is_instance(thread_obj)) {
2453 VM_VirtualThreadGetOrSetLocal op(this, Handle(current_thread, thread_obj),
2454 depth, slot, T_FLOAT, val, self);
2455 VMThread::execute(&op);
2456 err = op.result();
2457 } else {
2458 // Support for ordinary threads
2459 VM_GetOrSetLocal op(java_thread, depth, slot, T_FLOAT, val, self);
2460 VMThread::execute(&op);
2461 err = op.result();
2462 }
2463 return err;
2464 } /* end SetLocalFloat */
2465
2466
2467 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
2468 // depth - pre-checked as non-negative
2469 jvmtiError
2470 JvmtiEnv::SetLocalDouble(jthread thread, jint depth, jint slot, jdouble value) {
2471 JavaThread* current_thread = JavaThread::current();
2472 // rm object is created to clean up the javaVFrame created in
2473 // doit_prologue(), but after doit() is finished with it.
2474 ResourceMark rm(current_thread);
2475 HandleMark hm(current_thread);
2476 JvmtiVTMSTransitionDisabler disabler(thread);
2477 ThreadsListHandle tlh(current_thread);
2478
2479 JavaThread* java_thread = nullptr;
2480 oop thread_obj = nullptr;
2481 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, current_thread, &java_thread, &thread_obj);
2482 if (err != JVMTI_ERROR_NONE) {
2483 return err;
2484 }
2485 bool self = is_JavaThread_current(java_thread, thread_obj);
2486 jvalue val;
2487 val.d = value;
2488
2489 if (java_lang_VirtualThread::is_instance(thread_obj)) {
2490 VM_VirtualThreadGetOrSetLocal op(this, Handle(current_thread, thread_obj),
2491 depth, slot, T_DOUBLE, val, self);
2492 VMThread::execute(&op);
2493 err = op.result();
2494 } else {
2495 // Support for ordinary threads
2496 VM_GetOrSetLocal op(java_thread, depth, slot, T_DOUBLE, val, self);
2497 VMThread::execute(&op);
2498 err = op.result();
2499 }
2500 return err;
2501 } /* end SetLocalDouble */
2502
2503
2504 //
2505 // Breakpoint functions
2506 //
2507
2508 // method - pre-checked for validity, but may be null meaning obsolete method
2509 jvmtiError
2510 JvmtiEnv::SetBreakpoint(Method* method, jlocation location) {
2511 NULL_CHECK(method, JVMTI_ERROR_INVALID_METHODID);
2512 if (location < 0) { // simple invalid location check first
2513 return JVMTI_ERROR_INVALID_LOCATION;
2514 }
2515 // verify that the breakpoint is not past the end of the method
2516 if (location >= (jlocation) method->code_size()) {
2517 return JVMTI_ERROR_INVALID_LOCATION;
2518 }
2519
2520 ResourceMark rm;
2521 JvmtiBreakpoint bp(method, location);
2522 JvmtiBreakpoints& jvmti_breakpoints = JvmtiCurrentBreakpoints::get_jvmti_breakpoints();
2523 if (jvmti_breakpoints.set(bp) == JVMTI_ERROR_DUPLICATE)
2524 return JVMTI_ERROR_DUPLICATE;
2525
2526 if (TraceJVMTICalls) {
2527 jvmti_breakpoints.print();
2528 }
2529
2530 return JVMTI_ERROR_NONE;
2531 } /* end SetBreakpoint */
2532
2533
2534 // method - pre-checked for validity, but may be null meaning obsolete method
2535 jvmtiError
2536 JvmtiEnv::ClearBreakpoint(Method* method, jlocation location) {
2537 NULL_CHECK(method, JVMTI_ERROR_INVALID_METHODID);
2538
2539 if (location < 0) { // simple invalid location check first
2540 return JVMTI_ERROR_INVALID_LOCATION;
2541 }
2542
2543 // verify that the breakpoint is not past the end of the method
2544 if (location >= (jlocation) method->code_size()) {
2545 return JVMTI_ERROR_INVALID_LOCATION;
2546 }
2547
2548 JvmtiBreakpoint bp(method, location);
2549
2550 JvmtiBreakpoints& jvmti_breakpoints = JvmtiCurrentBreakpoints::get_jvmti_breakpoints();
2551 if (jvmti_breakpoints.clear(bp) == JVMTI_ERROR_NOT_FOUND)
2552 return JVMTI_ERROR_NOT_FOUND;
2553
2554 if (TraceJVMTICalls) {
2555 jvmti_breakpoints.print();
2556 }
2557
2558 return JVMTI_ERROR_NONE;
2559 } /* end ClearBreakpoint */
2560
2561
2562 //
2563 // Watched Field functions
2564 //
2565
2566 jvmtiError
2567 JvmtiEnv::SetFieldAccessWatch(fieldDescriptor* fdesc_ptr) {
2568 JvmtiVTMSTransitionDisabler disabler;
2569 // make sure we haven't set this watch before
2570 if (fdesc_ptr->is_field_access_watched()) return JVMTI_ERROR_DUPLICATE;
2571 fdesc_ptr->set_is_field_access_watched(true);
2572
2573 JvmtiEventController::change_field_watch(JVMTI_EVENT_FIELD_ACCESS, true);
2574
2575 return JVMTI_ERROR_NONE;
2576 } /* end SetFieldAccessWatch */
2577
2578
2579 jvmtiError
2580 JvmtiEnv::ClearFieldAccessWatch(fieldDescriptor* fdesc_ptr) {
2581 JvmtiVTMSTransitionDisabler disabler;
2582 // make sure we have a watch to clear
2583 if (!fdesc_ptr->is_field_access_watched()) return JVMTI_ERROR_NOT_FOUND;
2584 fdesc_ptr->set_is_field_access_watched(false);
2585
2586 JvmtiEventController::change_field_watch(JVMTI_EVENT_FIELD_ACCESS, false);
2587
2588 return JVMTI_ERROR_NONE;
2589 } /* end ClearFieldAccessWatch */
2590
2591
2592 jvmtiError
2593 JvmtiEnv::SetFieldModificationWatch(fieldDescriptor* fdesc_ptr) {
2594 JvmtiVTMSTransitionDisabler disabler;
2595 // make sure we haven't set this watch before
2596 if (fdesc_ptr->is_field_modification_watched()) return JVMTI_ERROR_DUPLICATE;
2597 fdesc_ptr->set_is_field_modification_watched(true);
2598
2599 JvmtiEventController::change_field_watch(JVMTI_EVENT_FIELD_MODIFICATION, true);
2600
2601 return JVMTI_ERROR_NONE;
2602 } /* end SetFieldModificationWatch */
2603
2604
2605 jvmtiError
2606 JvmtiEnv::ClearFieldModificationWatch(fieldDescriptor* fdesc_ptr) {
2607 JvmtiVTMSTransitionDisabler disabler;
2608 // make sure we have a watch to clear
2609 if (!fdesc_ptr->is_field_modification_watched()) return JVMTI_ERROR_NOT_FOUND;
2610 fdesc_ptr->set_is_field_modification_watched(false);
2611
2612 JvmtiEventController::change_field_watch(JVMTI_EVENT_FIELD_MODIFICATION, false);
2613
2614 return JVMTI_ERROR_NONE;
2615 } /* end ClearFieldModificationWatch */
2616
2617 //
2618 // Class functions
2619 //
2620
2621
2622 // k_mirror - may be primitive, this must be checked
2623 // signature_ptr - null is a valid value, must be checked
2624 // generic_ptr - null is a valid value, must be checked
2625 jvmtiError
2626 JvmtiEnv::GetClassSignature(oop k_mirror, char** signature_ptr, char** generic_ptr) {
2627 ResourceMark rm;
2628 bool isPrimitive = java_lang_Class::is_primitive(k_mirror);
2629 Klass* k = nullptr;
2630 if (!isPrimitive) {
2631 k = java_lang_Class::as_Klass(k_mirror);
2632 NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS);
2633 }
2634 if (signature_ptr != nullptr) {
2635 char* result = nullptr;
2636 if (isPrimitive) {
2637 char tchar = type2char(java_lang_Class::primitive_type(k_mirror));
2638 result = (char*) jvmtiMalloc(2);
2639 result[0] = tchar;
2640 result[1] = '\0';
2641 } else {
2642 const char* class_sig = k->signature_name();
2643 result = (char *) jvmtiMalloc(strlen(class_sig)+1);
2644 strcpy(result, class_sig);
2645 }
2646 *signature_ptr = result;
2647 }
2648 if (generic_ptr != nullptr) {
2649 *generic_ptr = nullptr;
2650 if (!isPrimitive && k->is_instance_klass()) {
2651 Symbol* soo = InstanceKlass::cast(k)->generic_signature();
2652 if (soo != nullptr) {
2653 const char *gen_sig = soo->as_C_string();
2654 if (gen_sig != nullptr) {
2655 char* gen_result;
2656 jvmtiError err = allocate(strlen(gen_sig) + 1,
2657 (unsigned char **)&gen_result);
2658 if (err != JVMTI_ERROR_NONE) {
2659 return err;
2660 }
2661 strcpy(gen_result, gen_sig);
2662 *generic_ptr = gen_result;
2663 }
2664 }
2665 }
2666 }
2667 return JVMTI_ERROR_NONE;
2668 } /* end GetClassSignature */
2669
2670
2671 // k_mirror - may be primitive, this must be checked
2672 // status_ptr - pre-checked for null
2673 jvmtiError
2674 JvmtiEnv::GetClassStatus(oop k_mirror, jint* status_ptr) {
2675 jint result = 0;
2676 if (java_lang_Class::is_primitive(k_mirror)) {
2677 result |= JVMTI_CLASS_STATUS_PRIMITIVE;
2678 } else {
2679 Klass* k = java_lang_Class::as_Klass(k_mirror);
2680 NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS);
2681 result = k->jvmti_class_status();
2682 }
2683 *status_ptr = result;
2684
2685 return JVMTI_ERROR_NONE;
2686 } /* end GetClassStatus */
2687
2688
2689 // k_mirror - may be primitive, this must be checked
2690 // source_name_ptr - pre-checked for null
2691 jvmtiError
2692 JvmtiEnv::GetSourceFileName(oop k_mirror, char** source_name_ptr) {
2693 if (java_lang_Class::is_primitive(k_mirror)) {
2694 return JVMTI_ERROR_ABSENT_INFORMATION;
2695 }
2696 Klass* k_klass = java_lang_Class::as_Klass(k_mirror);
2697 NULL_CHECK(k_klass, JVMTI_ERROR_INVALID_CLASS);
2698
2699 if (!k_klass->is_instance_klass()) {
2700 return JVMTI_ERROR_ABSENT_INFORMATION;
2701 }
2702
2703 Symbol* sfnOop = InstanceKlass::cast(k_klass)->source_file_name();
2704 NULL_CHECK(sfnOop, JVMTI_ERROR_ABSENT_INFORMATION);
2705 {
2706 JavaThread* current_thread = JavaThread::current();
2707 ResourceMark rm(current_thread);
2708 const char* sfncp = (const char*) sfnOop->as_C_string();
2709 *source_name_ptr = (char *) jvmtiMalloc(strlen(sfncp)+1);
2710 strcpy(*source_name_ptr, sfncp);
2711 }
2712
2713 return JVMTI_ERROR_NONE;
2714 } /* end GetSourceFileName */
2715
2716
2717 // k_mirror - may be primitive, this must be checked
2718 // modifiers_ptr - pre-checked for null
2719 jvmtiError
2720 JvmtiEnv::GetClassModifiers(oop k_mirror, jint* modifiers_ptr) {
2721 jint result = java_lang_Class::modifiers(k_mirror);
2722 *modifiers_ptr = result;
2723
2724 return JVMTI_ERROR_NONE;
2725 } /* end GetClassModifiers */
2726
2727
2728 // k_mirror - may be primitive, this must be checked
2729 // method_count_ptr - pre-checked for null
2730 // methods_ptr - pre-checked for null
2731 jvmtiError
2732 JvmtiEnv::GetClassMethods(oop k_mirror, jint* method_count_ptr, jmethodID** methods_ptr) {
2733 JavaThread* current_thread = JavaThread::current();
2734 HandleMark hm(current_thread);
2735
2736 if (java_lang_Class::is_primitive(k_mirror)) {
2737 *method_count_ptr = 0;
2738 *methods_ptr = (jmethodID*) jvmtiMalloc(0 * sizeof(jmethodID));
2739 return JVMTI_ERROR_NONE;
2740 }
2741 Klass* k = java_lang_Class::as_Klass(k_mirror);
2742 NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS);
2743
2744 // Return CLASS_NOT_PREPARED error as per JVMTI spec.
2745 if (!(k->jvmti_class_status() & (JVMTI_CLASS_STATUS_PREPARED|JVMTI_CLASS_STATUS_ARRAY) )) {
2746 return JVMTI_ERROR_CLASS_NOT_PREPARED;
2747 }
2748
2749 if (!k->is_instance_klass()) {
2750 *method_count_ptr = 0;
2751 *methods_ptr = (jmethodID*) jvmtiMalloc(0 * sizeof(jmethodID));
2752 return JVMTI_ERROR_NONE;
2753 }
2754 InstanceKlass* ik = InstanceKlass::cast(k);
2755 // Allocate the result and fill it in
2756 int result_length = ik->methods()->length();
2757 jmethodID* result_list = (jmethodID*)jvmtiMalloc(result_length * sizeof(jmethodID));
2758 int index;
2759 bool jmethodids_found = true;
2760 int skipped = 0; // skip overpass methods
2761
2762 for (index = 0; index < result_length; index++) {
2763 Method* m = ik->methods()->at(index);
2764 // Depending on can_maintain_original_method_order capability use the original
2765 // method ordering indices stored in the class, so we can emit jmethodIDs in
2766 // the order they appeared in the class file or just copy in current order.
2767 int result_index = JvmtiExport::can_maintain_original_method_order() ? ik->method_ordering()->at(index) : index;
2768 assert(result_index >= 0 && result_index < result_length, "invalid original method index");
2769 if (m->is_overpass()) {
2770 result_list[result_index] = nullptr;
2771 skipped++;
2772 continue;
2773 }
2774 jmethodID id;
2775 if (jmethodids_found) {
2776 id = m->find_jmethod_id_or_null();
2777 if (id == nullptr) {
2778 // If we find an uninitialized value, make sure there is
2779 // enough space for all the uninitialized values we might
2780 // find.
2781 ik->ensure_space_for_methodids(index);
2782 jmethodids_found = false;
2783 id = m->jmethod_id();
2784 }
2785 } else {
2786 id = m->jmethod_id();
2787 }
2788 result_list[result_index] = id;
2789 }
2790
2791 // Fill in return value.
2792 if (skipped > 0) {
2793 // copy results skipping null methodIDs
2794 *methods_ptr = (jmethodID*)jvmtiMalloc((result_length - skipped) * sizeof(jmethodID));
2795 *method_count_ptr = result_length - skipped;
2796 for (index = 0, skipped = 0; index < result_length; index++) {
2797 if (result_list[index] == nullptr) {
2798 skipped++;
2799 } else {
2800 (*methods_ptr)[index - skipped] = result_list[index];
2801 }
2802 }
2803 deallocate((unsigned char *)result_list);
2804 } else {
2805 *method_count_ptr = result_length;
2806 *methods_ptr = result_list;
2807 }
2808
2809 return JVMTI_ERROR_NONE;
2810 } /* end GetClassMethods */
2811
2812
2813 // k_mirror - may be primitive, this must be checked
2814 // field_count_ptr - pre-checked for null
2815 // fields_ptr - pre-checked for null
2816 jvmtiError
2817 JvmtiEnv::GetClassFields(oop k_mirror, jint* field_count_ptr, jfieldID** fields_ptr) {
2818 if (java_lang_Class::is_primitive(k_mirror)) {
2819 *field_count_ptr = 0;
2820 *fields_ptr = (jfieldID*) jvmtiMalloc(0 * sizeof(jfieldID));
2821 return JVMTI_ERROR_NONE;
2822 }
2823 JavaThread* current_thread = JavaThread::current();
2824 HandleMark hm(current_thread);
2825 Klass* k = java_lang_Class::as_Klass(k_mirror);
2826 NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS);
2827
2828 // Return CLASS_NOT_PREPARED error as per JVMTI spec.
2829 if (!(k->jvmti_class_status() & (JVMTI_CLASS_STATUS_PREPARED|JVMTI_CLASS_STATUS_ARRAY) )) {
2830 return JVMTI_ERROR_CLASS_NOT_PREPARED;
2831 }
2832
2833 if (!k->is_instance_klass()) {
2834 *field_count_ptr = 0;
2835 *fields_ptr = (jfieldID*) jvmtiMalloc(0 * sizeof(jfieldID));
2836 return JVMTI_ERROR_NONE;
2837 }
2838
2839 InstanceKlass* ik = InstanceKlass::cast(k);
2840
2841 FilteredJavaFieldStream flds(ik);
2842
2843 int result_count = flds.field_count();
2844
2845 // Allocate the result and fill it in.
2846 jfieldID* result_list = (jfieldID*)jvmtiMalloc(result_count * sizeof(jfieldID));
2847 for (int i = 0; i < result_count; i++, flds.next()) {
2848 result_list[i] = jfieldIDWorkaround::to_jfieldID(ik, flds.offset(),
2849 flds.access_flags().is_static(),
2850 flds.field_descriptor().is_flat());
2851 }
2852 assert(flds.done(), "just checking");
2853
2854 // Fill in the results
2855 *field_count_ptr = result_count;
2856 *fields_ptr = result_list;
2857
2858 return JVMTI_ERROR_NONE;
2859 } /* end GetClassFields */
2860
2861
2862 // k_mirror - may be primitive, this must be checked
2863 // interface_count_ptr - pre-checked for null
2864 // interfaces_ptr - pre-checked for null
2865 jvmtiError
2866 JvmtiEnv::GetImplementedInterfaces(oop k_mirror, jint* interface_count_ptr, jclass** interfaces_ptr) {
2867 {
2868 if (java_lang_Class::is_primitive(k_mirror)) {
2869 *interface_count_ptr = 0;
2870 *interfaces_ptr = (jclass*) jvmtiMalloc(0 * sizeof(jclass));
2871 return JVMTI_ERROR_NONE;
2872 }
2873 JavaThread* current_thread = JavaThread::current();
2874 HandleMark hm(current_thread);
2875 Klass* k = java_lang_Class::as_Klass(k_mirror);
2876 NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS);
2877
2878 // Return CLASS_NOT_PREPARED error as per JVMTI spec.
2879 if (!(k->jvmti_class_status() & (JVMTI_CLASS_STATUS_PREPARED|JVMTI_CLASS_STATUS_ARRAY) ))
2880 return JVMTI_ERROR_CLASS_NOT_PREPARED;
2881
2882 if (!k->is_instance_klass()) {
2883 *interface_count_ptr = 0;
2884 *interfaces_ptr = (jclass*) jvmtiMalloc(0 * sizeof(jclass));
2885 return JVMTI_ERROR_NONE;
2886 }
2887
2888 InstanceKlass* ik = InstanceKlass::cast(k);
2889 Array<InstanceKlass*>* interface_list = ik->local_interfaces();
2890 int result_length = (interface_list == nullptr ? 0 : interface_list->length());
2891 jclass* result_list = (jclass*) jvmtiMalloc(result_length * sizeof(jclass));
2892 for (int i_index = 0; i_index < result_length; i_index += 1) {
2893 InstanceKlass* klass_at = interface_list->at(i_index);
2894 assert(klass_at->is_klass(), "interfaces must be Klass*s");
2895 assert(klass_at->is_interface(), "interfaces must be interfaces");
2896 oop mirror_at = klass_at->java_mirror();
2897 Handle handle_at = Handle(current_thread, mirror_at);
2898 result_list[i_index] = (jclass) jni_reference(handle_at);
2899 }
2900 *interface_count_ptr = result_length;
2901 *interfaces_ptr = result_list;
2902 }
2903
2904 return JVMTI_ERROR_NONE;
2905 } /* end GetImplementedInterfaces */
2906
2907
2908 // k_mirror - may be primitive, this must be checked
2909 // minor_version_ptr - pre-checked for null
2910 // major_version_ptr - pre-checked for null
2911 jvmtiError
2912 JvmtiEnv::GetClassVersionNumbers(oop k_mirror, jint* minor_version_ptr, jint* major_version_ptr) {
2913 if (java_lang_Class::is_primitive(k_mirror)) {
2914 return JVMTI_ERROR_ABSENT_INFORMATION;
2915 }
2916 Klass* klass = java_lang_Class::as_Klass(k_mirror);
2917
2918 jint status = klass->jvmti_class_status();
2919 if (status & (JVMTI_CLASS_STATUS_ERROR)) {
2920 return JVMTI_ERROR_INVALID_CLASS;
2921 }
2922 if (status & (JVMTI_CLASS_STATUS_ARRAY)) {
2923 return JVMTI_ERROR_ABSENT_INFORMATION;
2924 }
2925
2926 InstanceKlass* ik = InstanceKlass::cast(klass);
2927 *minor_version_ptr = ik->minor_version();
2928 *major_version_ptr = ik->major_version();
2929
2930 return JVMTI_ERROR_NONE;
2931 } /* end GetClassVersionNumbers */
2932
2933
2934 // k_mirror - may be primitive, this must be checked
2935 // constant_pool_count_ptr - pre-checked for null
2936 // constant_pool_byte_count_ptr - pre-checked for null
2937 // constant_pool_bytes_ptr - pre-checked for null
2938 jvmtiError
2939 JvmtiEnv::GetConstantPool(oop k_mirror, jint* constant_pool_count_ptr, jint* constant_pool_byte_count_ptr, unsigned char** constant_pool_bytes_ptr) {
2940 if (java_lang_Class::is_primitive(k_mirror)) {
2941 return JVMTI_ERROR_ABSENT_INFORMATION;
2942 }
2943
2944 Klass* klass = java_lang_Class::as_Klass(k_mirror);
2945 Thread *thread = Thread::current();
2946 ResourceMark rm(thread);
2947
2948 jint status = klass->jvmti_class_status();
2949 if (status & (JVMTI_CLASS_STATUS_ERROR)) {
2950 return JVMTI_ERROR_INVALID_CLASS;
2951 }
2952 if (status & (JVMTI_CLASS_STATUS_ARRAY)) {
2953 return JVMTI_ERROR_ABSENT_INFORMATION;
2954 }
2955
2956 InstanceKlass* ik = InstanceKlass::cast(klass);
2957 JvmtiConstantPoolReconstituter reconstituter(ik);
2958 if (reconstituter.get_error() != JVMTI_ERROR_NONE) {
2959 return reconstituter.get_error();
2960 }
2961
2962 unsigned char *cpool_bytes;
2963 int cpool_size = reconstituter.cpool_size();
2964 if (reconstituter.get_error() != JVMTI_ERROR_NONE) {
2965 return reconstituter.get_error();
2966 }
2967 jvmtiError res = allocate(cpool_size, &cpool_bytes);
2968 if (res != JVMTI_ERROR_NONE) {
2969 return res;
2970 }
2971 reconstituter.copy_cpool_bytes(cpool_bytes);
2972 if (reconstituter.get_error() != JVMTI_ERROR_NONE) {
2973 return reconstituter.get_error();
2974 }
2975
2976 constantPoolHandle constants(thread, ik->constants());
2977 *constant_pool_count_ptr = constants->length();
2978 *constant_pool_byte_count_ptr = cpool_size;
2979 *constant_pool_bytes_ptr = cpool_bytes;
2980
2981 return JVMTI_ERROR_NONE;
2982 } /* end GetConstantPool */
2983
2984
2985 // k_mirror - may be primitive, this must be checked
2986 // is_interface_ptr - pre-checked for null
2987 jvmtiError
2988 JvmtiEnv::IsInterface(oop k_mirror, jboolean* is_interface_ptr) {
2989 {
2990 bool result = false;
2991 if (!java_lang_Class::is_primitive(k_mirror)) {
2992 Klass* k = java_lang_Class::as_Klass(k_mirror);
2993 if (k != nullptr && k->is_interface()) {
2994 result = true;
2995 }
2996 }
2997 *is_interface_ptr = result;
2998 }
2999
3000 return JVMTI_ERROR_NONE;
3001 } /* end IsInterface */
3002
3003
3004 // k_mirror - may be primitive, this must be checked
3005 // is_array_class_ptr - pre-checked for null
3006 jvmtiError
3007 JvmtiEnv::IsArrayClass(oop k_mirror, jboolean* is_array_class_ptr) {
3008 {
3009 bool result = false;
3010 if (!java_lang_Class::is_primitive(k_mirror)) {
3011 Klass* k = java_lang_Class::as_Klass(k_mirror);
3012 if (k != nullptr && k->is_array_klass()) {
3013 result = true;
3014 }
3015 }
3016 *is_array_class_ptr = result;
3017 }
3018
3019 return JVMTI_ERROR_NONE;
3020 } /* end IsArrayClass */
3021
3022
3023 // k_mirror - may be primitive, this must be checked
3024 // classloader_ptr - pre-checked for null
3025 jvmtiError
3026 JvmtiEnv::GetClassLoader(oop k_mirror, jobject* classloader_ptr) {
3027 {
3028 if (java_lang_Class::is_primitive(k_mirror)) {
3029 *classloader_ptr = (jclass) jni_reference(Handle());
3030 return JVMTI_ERROR_NONE;
3031 }
3032 JavaThread* current_thread = JavaThread::current();
3033 HandleMark hm(current_thread);
3034 Klass* k = java_lang_Class::as_Klass(k_mirror);
3035 NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS);
3036
3037 oop result_oop = k->class_loader();
3038 if (result_oop == nullptr) {
3039 *classloader_ptr = (jclass) jni_reference(Handle());
3040 return JVMTI_ERROR_NONE;
3041 }
3042 Handle result_handle = Handle(current_thread, result_oop);
3043 jclass result_jnihandle = (jclass) jni_reference(result_handle);
3044 *classloader_ptr = result_jnihandle;
3045 }
3046 return JVMTI_ERROR_NONE;
3047 } /* end GetClassLoader */
3048
3049
3050 // k_mirror - may be primitive, this must be checked
3051 // source_debug_extension_ptr - pre-checked for null
3052 jvmtiError
3053 JvmtiEnv::GetSourceDebugExtension(oop k_mirror, char** source_debug_extension_ptr) {
3054 {
3055 if (java_lang_Class::is_primitive(k_mirror)) {
3056 return JVMTI_ERROR_ABSENT_INFORMATION;
3057 }
3058 Klass* k = java_lang_Class::as_Klass(k_mirror);
3059 NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS);
3060 if (!k->is_instance_klass()) {
3061 return JVMTI_ERROR_ABSENT_INFORMATION;
3062 }
3063 const char* sde = InstanceKlass::cast(k)->source_debug_extension();
3064 NULL_CHECK(sde, JVMTI_ERROR_ABSENT_INFORMATION);
3065
3066 {
3067 *source_debug_extension_ptr = (char *) jvmtiMalloc(strlen(sde)+1);
3068 strcpy(*source_debug_extension_ptr, sde);
3069 }
3070 }
3071
3072 return JVMTI_ERROR_NONE;
3073 } /* end GetSourceDebugExtension */
3074
3075 //
3076 // Object functions
3077 //
3078
3079 // hash_code_ptr - pre-checked for null
3080 jvmtiError
3081 JvmtiEnv::GetObjectHashCode(jobject object, jint* hash_code_ptr) {
3082 oop mirror = JNIHandles::resolve_external_guard(object);
3083 NULL_CHECK(mirror, JVMTI_ERROR_INVALID_OBJECT);
3084 NULL_CHECK(hash_code_ptr, JVMTI_ERROR_NULL_POINTER);
3085
3086 if (mirror->is_inline_type()) {
3087 // For inline types, use the klass as a hash code.
3088 // TBD to improve this (see also JvmtiTagMapKey::get_hash for similar case).
3089 *hash_code_ptr = (jint)((int64_t)mirror->klass() >> 3);
3090 } else {
3091 *hash_code_ptr = (jint)mirror->identity_hash();
3092 }
3093 return JVMTI_ERROR_NONE;
3094 } /* end GetObjectHashCode */
3095
3096
3097 // info_ptr - pre-checked for null
3098 jvmtiError
3099 JvmtiEnv::GetObjectMonitorUsage(jobject object, jvmtiMonitorUsage* info_ptr) {
3100 // This needs to be performed at a safepoint to gather stable data
3101 // because monitor owner / waiters might not be suspended.
3102 VM_GetObjectMonitorUsage op(this, JavaThread::current(), object, info_ptr);
3103 VMThread::execute(&op);
3104 return op.result();
3105 } /* end GetObjectMonitorUsage */
3106
3107
3108 //
3109 // Field functions
3110 //
3111
3112 // name_ptr - null is a valid value, must be checked
3113 // signature_ptr - null is a valid value, must be checked
3114 // generic_ptr - null is a valid value, must be checked
3115 jvmtiError
3116 JvmtiEnv::GetFieldName(fieldDescriptor* fdesc_ptr, char** name_ptr, char** signature_ptr, char** generic_ptr) {
3117 JavaThread* current_thread = JavaThread::current();
3118 ResourceMark rm(current_thread);
3119 if (name_ptr == nullptr) {
3120 // just don't return the name
3121 } else {
3122 const char* fieldName = fdesc_ptr->name()->as_C_string();
3123 *name_ptr = (char*) jvmtiMalloc(strlen(fieldName) + 1);
3124 if (*name_ptr == nullptr)
3125 return JVMTI_ERROR_OUT_OF_MEMORY;
3126 strcpy(*name_ptr, fieldName);
3127 }
3128 if (signature_ptr== nullptr) {
3129 // just don't return the signature
3130 } else {
3131 const char* fieldSignature = fdesc_ptr->signature()->as_C_string();
3132 *signature_ptr = (char*) jvmtiMalloc(strlen(fieldSignature) + 1);
3133 if (*signature_ptr == nullptr)
3134 return JVMTI_ERROR_OUT_OF_MEMORY;
3135 strcpy(*signature_ptr, fieldSignature);
3136 }
3137 if (generic_ptr != nullptr) {
3138 *generic_ptr = nullptr;
3139 Symbol* soop = fdesc_ptr->generic_signature();
3140 if (soop != nullptr) {
3141 const char* gen_sig = soop->as_C_string();
3142 if (gen_sig != nullptr) {
3143 jvmtiError err = allocate(strlen(gen_sig) + 1, (unsigned char **)generic_ptr);
3144 if (err != JVMTI_ERROR_NONE) {
3145 return err;
3146 }
3147 strcpy(*generic_ptr, gen_sig);
3148 }
3149 }
3150 }
3151 return JVMTI_ERROR_NONE;
3152 } /* end GetFieldName */
3153
3154
3155 // declaring_class_ptr - pre-checked for null
3156 jvmtiError
3157 JvmtiEnv::GetFieldDeclaringClass(fieldDescriptor* fdesc_ptr, jclass* declaring_class_ptr) {
3158 // As for the GetFieldDeclaringClass method, the XSL generated C++ code that calls it has
3159 // a jclass of the relevant class or a subclass of it, which is fine in terms of ensuring
3160 // the holder is kept alive.
3161 *declaring_class_ptr = get_jni_class_non_null(fdesc_ptr->field_holder());
3162 return JVMTI_ERROR_NONE;
3163 } /* end GetFieldDeclaringClass */
3164
3165
3166 // modifiers_ptr - pre-checked for null
3167 jvmtiError
3168 JvmtiEnv::GetFieldModifiers(fieldDescriptor* fdesc_ptr, jint* modifiers_ptr) {
3169
3170 AccessFlags resultFlags = fdesc_ptr->access_flags();
3171 jint result = resultFlags.as_field_flags();
3172 *modifiers_ptr = result;
3173
3174 return JVMTI_ERROR_NONE;
3175 } /* end GetFieldModifiers */
3176
3177
3178 // is_synthetic_ptr - pre-checked for null
3179 jvmtiError
3180 JvmtiEnv::IsFieldSynthetic(fieldDescriptor* fdesc_ptr, jboolean* is_synthetic_ptr) {
3181 *is_synthetic_ptr = fdesc_ptr->is_synthetic();
3182 return JVMTI_ERROR_NONE;
3183 } /* end IsFieldSynthetic */
3184
3185
3186 //
3187 // Method functions
3188 //
3189
3190 // method - pre-checked for validity, but may be null meaning obsolete method
3191 // name_ptr - null is a valid value, must be checked
3192 // signature_ptr - null is a valid value, must be checked
3193 // generic_ptr - null is a valid value, must be checked
3194 jvmtiError
3195 JvmtiEnv::GetMethodName(Method* method, char** name_ptr, char** signature_ptr, char** generic_ptr) {
3196 NULL_CHECK(method, JVMTI_ERROR_INVALID_METHODID);
3197 JavaThread* current_thread = JavaThread::current();
3198
3199 ResourceMark rm(current_thread); // get the utf8 name and signature
3200 if (name_ptr == nullptr) {
3201 // just don't return the name
3202 } else {
3203 const char* utf8_name = (const char *) method->name()->as_utf8();
3204 *name_ptr = (char *) jvmtiMalloc(strlen(utf8_name)+1);
3205 strcpy(*name_ptr, utf8_name);
3206 }
3207 if (signature_ptr == nullptr) {
3208 // just don't return the signature
3209 } else {
3210 const char* utf8_signature = (const char *) method->signature()->as_utf8();
3211 *signature_ptr = (char *) jvmtiMalloc(strlen(utf8_signature) + 1);
3212 strcpy(*signature_ptr, utf8_signature);
3213 }
3214
3215 if (generic_ptr != nullptr) {
3216 *generic_ptr = nullptr;
3217 Symbol* soop = method->generic_signature();
3218 if (soop != nullptr) {
3219 const char* gen_sig = soop->as_C_string();
3220 if (gen_sig != nullptr) {
3221 jvmtiError err = allocate(strlen(gen_sig) + 1, (unsigned char **)generic_ptr);
3222 if (err != JVMTI_ERROR_NONE) {
3223 return err;
3224 }
3225 strcpy(*generic_ptr, gen_sig);
3226 }
3227 }
3228 }
3229 return JVMTI_ERROR_NONE;
3230 } /* end GetMethodName */
3231
3232
3233 // method - pre-checked for validity, but may be null meaning obsolete method
3234 // declaring_class_ptr - pre-checked for null
3235 jvmtiError
3236 JvmtiEnv::GetMethodDeclaringClass(Method* method, jclass* declaring_class_ptr) {
3237 NULL_CHECK(method, JVMTI_ERROR_INVALID_METHODID);
3238 Klass* k = method->method_holder();
3239 Handle holder(Thread::current(), k->klass_holder()); // keep the klass alive
3240 (*declaring_class_ptr) = get_jni_class_non_null(k);
3241 return JVMTI_ERROR_NONE;
3242 } /* end GetMethodDeclaringClass */
3243
3244
3245 // method - pre-checked for validity, but may be null meaning obsolete method
3246 // modifiers_ptr - pre-checked for null
3247 jvmtiError
3248 JvmtiEnv::GetMethodModifiers(Method* method, jint* modifiers_ptr) {
3249 NULL_CHECK(method, JVMTI_ERROR_INVALID_METHODID);
3250 (*modifiers_ptr) = method->access_flags().as_method_flags();
3251 return JVMTI_ERROR_NONE;
3252 } /* end GetMethodModifiers */
3253
3254
3255 // method - pre-checked for validity, but may be null meaning obsolete method
3256 // max_ptr - pre-checked for null
3257 jvmtiError
3258 JvmtiEnv::GetMaxLocals(Method* method, jint* max_ptr) {
3259 NULL_CHECK(method, JVMTI_ERROR_INVALID_METHODID);
3260 // get max stack
3261 (*max_ptr) = method->max_locals();
3262 return JVMTI_ERROR_NONE;
3263 } /* end GetMaxLocals */
3264
3265
3266 // method - pre-checked for validity, but may be null meaning obsolete method
3267 // size_ptr - pre-checked for null
3268 jvmtiError
3269 JvmtiEnv::GetArgumentsSize(Method* method, jint* size_ptr) {
3270 NULL_CHECK(method, JVMTI_ERROR_INVALID_METHODID);
3271 // get size of arguments
3272
3273 (*size_ptr) = method->size_of_parameters();
3274 return JVMTI_ERROR_NONE;
3275 } /* end GetArgumentsSize */
3276
3277
3278 // method - pre-checked for validity, but may be null meaning obsolete method
3279 // entry_count_ptr - pre-checked for null
3280 // table_ptr - pre-checked for null
3281 jvmtiError
3282 JvmtiEnv::GetLineNumberTable(Method* method, jint* entry_count_ptr, jvmtiLineNumberEntry** table_ptr) {
3283 NULL_CHECK(method, JVMTI_ERROR_INVALID_METHODID);
3284 if (!method->has_linenumber_table()) {
3285 return (JVMTI_ERROR_ABSENT_INFORMATION);
3286 }
3287
3288 // The line number table is compressed so we don't know how big it is until decompressed.
3289 // Decompression is really fast so we just do it twice.
3290
3291 // Compute size of table
3292 jint num_entries = 0;
3293 CompressedLineNumberReadStream stream(method->compressed_linenumber_table());
3294 while (stream.read_pair()) {
3295 num_entries++;
3296 }
3297 jvmtiLineNumberEntry *jvmti_table =
3298 (jvmtiLineNumberEntry *)jvmtiMalloc(num_entries * (sizeof(jvmtiLineNumberEntry)));
3299
3300 // Fill jvmti table
3301 if (num_entries > 0) {
3302 int index = 0;
3303 CompressedLineNumberReadStream stream(method->compressed_linenumber_table());
3304 while (stream.read_pair()) {
3305 jvmti_table[index].start_location = (jlocation) stream.bci();
3306 jvmti_table[index].line_number = (jint) stream.line();
3307 index++;
3308 }
3309 assert(index == num_entries, "sanity check");
3310 }
3311
3312 // Set up results
3313 (*entry_count_ptr) = num_entries;
3314 (*table_ptr) = jvmti_table;
3315
3316 return JVMTI_ERROR_NONE;
3317 } /* end GetLineNumberTable */
3318
3319
3320 // method - pre-checked for validity, but may be null meaning obsolete method
3321 // start_location_ptr - pre-checked for null
3322 // end_location_ptr - pre-checked for null
3323 jvmtiError
3324 JvmtiEnv::GetMethodLocation(Method* method, jlocation* start_location_ptr, jlocation* end_location_ptr) {
3325
3326 NULL_CHECK(method, JVMTI_ERROR_INVALID_METHODID);
3327 // get start and end location
3328 (*end_location_ptr) = (jlocation) (method->code_size() - 1);
3329 if (method->code_size() == 0) {
3330 // there is no code so there is no start location
3331 (*start_location_ptr) = (jlocation)(-1);
3332 } else {
3333 (*start_location_ptr) = (jlocation)(0);
3334 }
3335
3336 return JVMTI_ERROR_NONE;
3337 } /* end GetMethodLocation */
3338
3339
3340 // method - pre-checked for validity, but may be null meaning obsolete method
3341 // entry_count_ptr - pre-checked for null
3342 // table_ptr - pre-checked for null
3343 jvmtiError
3344 JvmtiEnv::GetLocalVariableTable(Method* method, jint* entry_count_ptr, jvmtiLocalVariableEntry** table_ptr) {
3345
3346 NULL_CHECK(method, JVMTI_ERROR_INVALID_METHODID);
3347 JavaThread* current_thread = JavaThread::current();
3348
3349 // does the klass have any local variable information?
3350 InstanceKlass* ik = method->method_holder();
3351 if (!ik->has_localvariable_table()) {
3352 return (JVMTI_ERROR_ABSENT_INFORMATION);
3353 }
3354
3355 ConstantPool* constants = method->constants();
3356 NULL_CHECK(constants, JVMTI_ERROR_ABSENT_INFORMATION);
3357
3358 // in the vm localvariable table representation, 6 consecutive elements in the table
3359 // represent a 6-tuple of shorts
3360 // [start_pc, length, name_index, descriptor_index, signature_index, index]
3361 jint num_entries = method->localvariable_table_length();
3362 jvmtiLocalVariableEntry *jvmti_table = (jvmtiLocalVariableEntry *)
3363 jvmtiMalloc(num_entries * (sizeof(jvmtiLocalVariableEntry)));
3364
3365 if (num_entries > 0) {
3366 LocalVariableTableElement* table = method->localvariable_table_start();
3367 for (int i = 0; i < num_entries; i++) {
3368 // get the 5 tuple information from the vm table
3369 jlocation start_location = (jlocation) table[i].start_bci;
3370 jint length = (jint) table[i].length;
3371 int name_index = (int) table[i].name_cp_index;
3372 int signature_index = (int) table[i].descriptor_cp_index;
3373 int generic_signature_index = (int) table[i].signature_cp_index;
3374 jint slot = (jint) table[i].slot;
3375
3376 // get utf8 name and signature
3377 char *name_buf = nullptr;
3378 char *sig_buf = nullptr;
3379 char *gen_sig_buf = nullptr;
3380 {
3381 ResourceMark rm(current_thread);
3382
3383 const char *utf8_name = (const char *) constants->symbol_at(name_index)->as_utf8();
3384 name_buf = (char *) jvmtiMalloc(strlen(utf8_name)+1);
3385 strcpy(name_buf, utf8_name);
3386
3387 const char *utf8_signature = (const char *) constants->symbol_at(signature_index)->as_utf8();
3388 sig_buf = (char *) jvmtiMalloc(strlen(utf8_signature)+1);
3389 strcpy(sig_buf, utf8_signature);
3390
3391 if (generic_signature_index > 0) {
3392 const char *utf8_gen_sign = (const char *)
3393 constants->symbol_at(generic_signature_index)->as_utf8();
3394 gen_sig_buf = (char *) jvmtiMalloc(strlen(utf8_gen_sign)+1);
3395 strcpy(gen_sig_buf, utf8_gen_sign);
3396 }
3397 }
3398
3399 // fill in the jvmti local variable table
3400 jvmti_table[i].start_location = start_location;
3401 jvmti_table[i].length = length;
3402 jvmti_table[i].name = name_buf;
3403 jvmti_table[i].signature = sig_buf;
3404 jvmti_table[i].generic_signature = gen_sig_buf;
3405 jvmti_table[i].slot = slot;
3406 }
3407 }
3408
3409 // set results
3410 (*entry_count_ptr) = num_entries;
3411 (*table_ptr) = jvmti_table;
3412
3413 return JVMTI_ERROR_NONE;
3414 } /* end GetLocalVariableTable */
3415
3416
3417 // method - pre-checked for validity, but may be null meaning obsolete method
3418 // bytecode_count_ptr - pre-checked for null
3419 // bytecodes_ptr - pre-checked for null
3420 jvmtiError
3421 JvmtiEnv::GetBytecodes(Method* method, jint* bytecode_count_ptr, unsigned char** bytecodes_ptr) {
3422 NULL_CHECK(method, JVMTI_ERROR_INVALID_METHODID);
3423
3424 methodHandle mh(Thread::current(), method);
3425 jint size = (jint)mh->code_size();
3426 jvmtiError err = allocate(size, bytecodes_ptr);
3427 if (err != JVMTI_ERROR_NONE) {
3428 return err;
3429 }
3430
3431 (*bytecode_count_ptr) = size;
3432 // get byte codes
3433 JvmtiClassFileReconstituter::copy_bytecodes(mh, *bytecodes_ptr);
3434
3435 return JVMTI_ERROR_NONE;
3436 } /* end GetBytecodes */
3437
3438
3439 // method - pre-checked for validity, but may be null meaning obsolete method
3440 // is_native_ptr - pre-checked for null
3441 jvmtiError
3442 JvmtiEnv::IsMethodNative(Method* method, jboolean* is_native_ptr) {
3443 NULL_CHECK(method, JVMTI_ERROR_INVALID_METHODID);
3444 (*is_native_ptr) = method->is_native();
3445 return JVMTI_ERROR_NONE;
3446 } /* end IsMethodNative */
3447
3448
3449 // method - pre-checked for validity, but may be null meaning obsolete method
3450 // is_synthetic_ptr - pre-checked for null
3451 jvmtiError
3452 JvmtiEnv::IsMethodSynthetic(Method* method, jboolean* is_synthetic_ptr) {
3453 NULL_CHECK(method, JVMTI_ERROR_INVALID_METHODID);
3454 (*is_synthetic_ptr) = method->is_synthetic();
3455 return JVMTI_ERROR_NONE;
3456 } /* end IsMethodSynthetic */
3457
3458
3459 // method - pre-checked for validity, but may be null meaning obsolete method
3460 // is_obsolete_ptr - pre-checked for null
3461 jvmtiError
3462 JvmtiEnv::IsMethodObsolete(Method* method, jboolean* is_obsolete_ptr) {
3463 if (use_version_1_0_semantics() &&
3464 get_capabilities()->can_redefine_classes == 0) {
3465 // This JvmtiEnv requested version 1.0 semantics and this function
3466 // requires the can_redefine_classes capability in version 1.0 so
3467 // we need to return an error here.
3468 return JVMTI_ERROR_MUST_POSSESS_CAPABILITY;
3469 }
3470
3471 if (method == nullptr || method->is_obsolete()) {
3472 *is_obsolete_ptr = true;
3473 } else {
3474 *is_obsolete_ptr = false;
3475 }
3476 return JVMTI_ERROR_NONE;
3477 } /* end IsMethodObsolete */
3478
3479 //
3480 // Raw Monitor functions
3481 //
3482
3483 // name - pre-checked for null
3484 // monitor_ptr - pre-checked for null
3485 jvmtiError
3486 JvmtiEnv::CreateRawMonitor(const char* name, jrawMonitorID* monitor_ptr) {
3487 JvmtiRawMonitor* rmonitor = new (std::nothrow) JvmtiRawMonitor(name);
3488 NULL_CHECK(rmonitor, JVMTI_ERROR_OUT_OF_MEMORY);
3489
3490 *monitor_ptr = (jrawMonitorID)rmonitor;
3491
3492 return JVMTI_ERROR_NONE;
3493 } /* end CreateRawMonitor */
3494
3495
3496 // rmonitor - pre-checked for validity
3497 jvmtiError
3498 JvmtiEnv::DestroyRawMonitor(JvmtiRawMonitor * rmonitor) {
3499 if (Threads::number_of_threads() == 0) {
3500 // Remove this monitor from pending raw monitors list
3501 // if it has entered in onload or start phase.
3502 JvmtiPendingMonitors::destroy(rmonitor);
3503 } else {
3504 Thread* thread = Thread::current();
3505 if (rmonitor->owner() == thread) {
3506 // The caller owns this monitor which we are about to destroy.
3507 // We exit the underlying synchronization object so that the
3508 // "delete monitor" call below can work without an assertion
3509 // failure on systems that don't like destroying synchronization
3510 // objects that are locked.
3511 int r;
3512 int recursion = rmonitor->recursions();
3513 for (int i = 0; i <= recursion; i++) {
3514 r = rmonitor->raw_exit(thread);
3515 assert(r == JvmtiRawMonitor::M_OK, "raw_exit should have worked");
3516 if (r != JvmtiRawMonitor::M_OK) { // robustness
3517 return JVMTI_ERROR_INTERNAL;
3518 }
3519 }
3520 }
3521 if (rmonitor->owner() != nullptr) {
3522 // The caller is trying to destroy a monitor that is locked by
3523 // someone else. While this is not forbidden by the JVMTI
3524 // spec, it will cause an assertion failure on systems that don't
3525 // like destroying synchronization objects that are locked.
3526 // We indicate a problem with the error return (and leak the
3527 // monitor's memory).
3528 return JVMTI_ERROR_NOT_MONITOR_OWNER;
3529 }
3530 }
3531
3532 delete rmonitor;
3533
3534 return JVMTI_ERROR_NONE;
3535 } /* end DestroyRawMonitor */
3536
3537
3538 // rmonitor - pre-checked for validity
3539 jvmtiError
3540 JvmtiEnv::RawMonitorEnter(JvmtiRawMonitor * rmonitor) {
3541 if (Threads::number_of_threads() == 0) {
3542 // No JavaThreads exist so JvmtiRawMonitor enter cannot be
3543 // used, add this raw monitor to the pending list.
3544 // The pending monitors will be actually entered when
3545 // the VM is setup.
3546 // See transition_pending_raw_monitors in create_vm()
3547 // in thread.cpp.
3548 JvmtiPendingMonitors::enter(rmonitor);
3549 } else {
3550 Thread* thread = Thread::current();
3551 // 8266889: raw_enter changes Java thread state, needs WXWrite
3552 MACOS_AARCH64_ONLY(ThreadWXEnable __wx(WXWrite, thread));
3553 rmonitor->raw_enter(thread);
3554 }
3555 return JVMTI_ERROR_NONE;
3556 } /* end RawMonitorEnter */
3557
3558
3559 // rmonitor - pre-checked for validity
3560 jvmtiError
3561 JvmtiEnv::RawMonitorExit(JvmtiRawMonitor * rmonitor) {
3562 jvmtiError err = JVMTI_ERROR_NONE;
3563
3564 if (Threads::number_of_threads() == 0) {
3565 // No JavaThreads exist so just remove this monitor from the pending list.
3566 // Bool value from exit is false if rmonitor is not in the list.
3567 if (!JvmtiPendingMonitors::exit(rmonitor)) {
3568 err = JVMTI_ERROR_NOT_MONITOR_OWNER;
3569 }
3570 } else {
3571 Thread* thread = Thread::current();
3572 int r = rmonitor->raw_exit(thread);
3573 if (r == JvmtiRawMonitor::M_ILLEGAL_MONITOR_STATE) {
3574 err = JVMTI_ERROR_NOT_MONITOR_OWNER;
3575 }
3576 }
3577 return err;
3578 } /* end RawMonitorExit */
3579
3580
3581 // rmonitor - pre-checked for validity
3582 jvmtiError
3583 JvmtiEnv::RawMonitorWait(JvmtiRawMonitor * rmonitor, jlong millis) {
3584 Thread* thread = Thread::current();
3585 // 8266889: raw_wait changes Java thread state, needs WXWrite
3586 MACOS_AARCH64_ONLY(ThreadWXEnable __wx(WXWrite, thread));
3587 int r = rmonitor->raw_wait(millis, thread);
3588
3589 switch (r) {
3590 case JvmtiRawMonitor::M_INTERRUPTED:
3591 return JVMTI_ERROR_INTERRUPT;
3592 case JvmtiRawMonitor::M_ILLEGAL_MONITOR_STATE:
3593 return JVMTI_ERROR_NOT_MONITOR_OWNER;
3594 default:
3595 return JVMTI_ERROR_NONE;
3596 }
3597 } /* end RawMonitorWait */
3598
3599
3600 // rmonitor - pre-checked for validity
3601 jvmtiError
3602 JvmtiEnv::RawMonitorNotify(JvmtiRawMonitor * rmonitor) {
3603 Thread* thread = Thread::current();
3604 int r = rmonitor->raw_notify(thread);
3605
3606 if (r == JvmtiRawMonitor::M_ILLEGAL_MONITOR_STATE) {
3607 return JVMTI_ERROR_NOT_MONITOR_OWNER;
3608 }
3609 return JVMTI_ERROR_NONE;
3610 } /* end RawMonitorNotify */
3611
3612
3613 // rmonitor - pre-checked for validity
3614 jvmtiError
3615 JvmtiEnv::RawMonitorNotifyAll(JvmtiRawMonitor * rmonitor) {
3616 Thread* thread = Thread::current();
3617 int r = rmonitor->raw_notifyAll(thread);
3618
3619 if (r == JvmtiRawMonitor::M_ILLEGAL_MONITOR_STATE) {
3620 return JVMTI_ERROR_NOT_MONITOR_OWNER;
3621 }
3622 return JVMTI_ERROR_NONE;
3623 } /* end RawMonitorNotifyAll */
3624
3625
3626 //
3627 // JNI Function Interception functions
3628 //
3629
3630
3631 // function_table - pre-checked for null
3632 jvmtiError
3633 JvmtiEnv::SetJNIFunctionTable(const jniNativeInterface* function_table) {
3634 // Copy jni function table at safepoint.
3635 VM_JNIFunctionTableCopier copier(function_table);
3636 VMThread::execute(&copier);
3637
3638 return JVMTI_ERROR_NONE;
3639 } /* end SetJNIFunctionTable */
3640
3641
3642 // function_table - pre-checked for null
3643 jvmtiError
3644 JvmtiEnv::GetJNIFunctionTable(jniNativeInterface** function_table) {
3645 *function_table=(jniNativeInterface*)jvmtiMalloc(sizeof(jniNativeInterface));
3646 if (*function_table == nullptr)
3647 return JVMTI_ERROR_OUT_OF_MEMORY;
3648 memcpy(*function_table,(JavaThread::current())->get_jni_functions(),sizeof(jniNativeInterface));
3649 return JVMTI_ERROR_NONE;
3650 } /* end GetJNIFunctionTable */
3651
3652
3653 //
3654 // Event Management functions
3655 //
3656
3657 jvmtiError
3658 JvmtiEnv::GenerateEvents(jvmtiEvent event_type) {
3659 // can only generate two event types
3660 if (event_type != JVMTI_EVENT_COMPILED_METHOD_LOAD &&
3661 event_type != JVMTI_EVENT_DYNAMIC_CODE_GENERATED) {
3662 return JVMTI_ERROR_ILLEGAL_ARGUMENT;
3663 }
3664
3665 // for compiled_method_load events we must check that the environment
3666 // has the can_generate_compiled_method_load_events capability.
3667 if (event_type == JVMTI_EVENT_COMPILED_METHOD_LOAD) {
3668 if (get_capabilities()->can_generate_compiled_method_load_events == 0) {
3669 return JVMTI_ERROR_MUST_POSSESS_CAPABILITY;
3670 }
3671 return JvmtiCodeBlobEvents::generate_compiled_method_load_events(this);
3672 } else {
3673 return JvmtiCodeBlobEvents::generate_dynamic_code_events(this);
3674 }
3675
3676 } /* end GenerateEvents */
3677
3678
3679 //
3680 // Extension Mechanism functions
3681 //
3682
3683 // extension_count_ptr - pre-checked for null
3684 // extensions - pre-checked for null
3685 jvmtiError
3686 JvmtiEnv::GetExtensionFunctions(jint* extension_count_ptr, jvmtiExtensionFunctionInfo** extensions) {
3687 return JvmtiExtensions::get_functions(this, extension_count_ptr, extensions);
3688 } /* end GetExtensionFunctions */
3689
3690
3691 // extension_count_ptr - pre-checked for null
3692 // extensions - pre-checked for null
3693 jvmtiError
3694 JvmtiEnv::GetExtensionEvents(jint* extension_count_ptr, jvmtiExtensionEventInfo** extensions) {
3695 return JvmtiExtensions::get_events(this, extension_count_ptr, extensions);
3696 } /* end GetExtensionEvents */
3697
3698
3699 // callback - null is a valid value, must be checked
3700 jvmtiError
3701 JvmtiEnv::SetExtensionEventCallback(jint extension_event_index, jvmtiExtensionEvent callback) {
3702 return JvmtiExtensions::set_event_callback(this, extension_event_index, callback);
3703 } /* end SetExtensionEventCallback */
3704
3705 //
3706 // Timers functions
3707 //
3708
3709 // info_ptr - pre-checked for null
3710 jvmtiError
3711 JvmtiEnv::GetCurrentThreadCpuTimerInfo(jvmtiTimerInfo* info_ptr) {
3712 os::current_thread_cpu_time_info(info_ptr);
3713 return JVMTI_ERROR_NONE;
3714 } /* end GetCurrentThreadCpuTimerInfo */
3715
3716
3717 // nanos_ptr - pre-checked for null
3718 jvmtiError
3719 JvmtiEnv::GetCurrentThreadCpuTime(jlong* nanos_ptr) {
3720 Thread* thread = Thread::current();
3721
3722 // Surprisingly the GetCurrentThreadCpuTime is used by non-JavaThread's.
3723 if (thread->is_Java_thread()) {
3724 if (JavaThread::cast(thread)->is_vthread_mounted()) {
3725 // No support for a VirtualThread (yet).
3726 return JVMTI_ERROR_UNSUPPORTED_OPERATION;
3727 }
3728 }
3729 *nanos_ptr = os::current_thread_cpu_time();
3730 return JVMTI_ERROR_NONE;
3731 } /* end GetCurrentThreadCpuTime */
3732
3733
3734 // info_ptr - pre-checked for null
3735 jvmtiError
3736 JvmtiEnv::GetThreadCpuTimerInfo(jvmtiTimerInfo* info_ptr) {
3737 os::thread_cpu_time_info(info_ptr);
3738 return JVMTI_ERROR_NONE;
3739 } /* end GetThreadCpuTimerInfo */
3740
3741
3742 // nanos_ptr - pre-checked for null
3743 jvmtiError
3744 JvmtiEnv::GetThreadCpuTime(jthread thread, jlong* nanos_ptr) {
3745 JavaThread* current_thread = JavaThread::current();
3746 ThreadsListHandle tlh(current_thread);
3747 JavaThread* java_thread = nullptr;
3748 oop thread_oop = nullptr;
3749
3750 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, current_thread, &java_thread, &thread_oop);
3751
3752 if (thread_oop != nullptr && thread_oop->is_a(vmClasses::BaseVirtualThread_klass())) {
3753 // No support for virtual threads (yet).
3754 return JVMTI_ERROR_UNSUPPORTED_OPERATION;
3755 }
3756 if (err != JVMTI_ERROR_NONE) {
3757 return err;
3758 }
3759 NULL_CHECK(nanos_ptr, JVMTI_ERROR_NULL_POINTER);
3760
3761 *nanos_ptr = os::thread_cpu_time(java_thread);
3762 return JVMTI_ERROR_NONE;
3763 } /* end GetThreadCpuTime */
3764
3765
3766 // info_ptr - pre-checked for null
3767 jvmtiError
3768 JvmtiEnv::GetTimerInfo(jvmtiTimerInfo* info_ptr) {
3769 os::javaTimeNanos_info(info_ptr);
3770 return JVMTI_ERROR_NONE;
3771 } /* end GetTimerInfo */
3772
3773
3774 // nanos_ptr - pre-checked for null
3775 jvmtiError
3776 JvmtiEnv::GetTime(jlong* nanos_ptr) {
3777 *nanos_ptr = os::javaTimeNanos();
3778 return JVMTI_ERROR_NONE;
3779 } /* end GetTime */
3780
3781
3782 // processor_count_ptr - pre-checked for null
3783 jvmtiError
3784 JvmtiEnv::GetAvailableProcessors(jint* processor_count_ptr) {
3785 *processor_count_ptr = os::active_processor_count();
3786 return JVMTI_ERROR_NONE;
3787 } /* end GetAvailableProcessors */
3788
3789 jvmtiError
3790 JvmtiEnv::SetHeapSamplingInterval(jint sampling_interval) {
3791 if (sampling_interval < 0) {
3792 return JVMTI_ERROR_ILLEGAL_ARGUMENT;
3793 }
3794 ThreadHeapSampler::set_sampling_interval(sampling_interval);
3795 return JVMTI_ERROR_NONE;
3796 } /* end SetHeapSamplingInterval */
3797
3798 //
3799 // System Properties functions
3800 //
3801
3802 // count_ptr - pre-checked for null
3803 // property_ptr - pre-checked for null
3804 jvmtiError
3805 JvmtiEnv::GetSystemProperties(jint* count_ptr, char*** property_ptr) {
3806 jvmtiError err = JVMTI_ERROR_NONE;
3807
3808 // Get the number of readable properties.
3809 *count_ptr = Arguments::PropertyList_readable_count(Arguments::system_properties());
3810
3811 // Allocate memory to hold the exact number of readable properties.
3812 err = allocate(*count_ptr * sizeof(char *), (unsigned char **)property_ptr);
3813 if (err != JVMTI_ERROR_NONE) {
3814 return err;
3815 }
3816 int readable_count = 0;
3817 // Loop through the system properties until all the readable properties are found.
3818 for (SystemProperty* p = Arguments::system_properties(); p != nullptr && readable_count < *count_ptr; p = p->next()) {
3819 if (p->readable()) {
3820 const char *key = p->key();
3821 char **tmp_value = *property_ptr+readable_count;
3822 readable_count++;
3823 err = allocate((strlen(key)+1) * sizeof(char), (unsigned char**)tmp_value);
3824 if (err == JVMTI_ERROR_NONE) {
3825 strcpy(*tmp_value, key);
3826 } else {
3827 // clean up previously allocated memory.
3828 for (int j = 0; j < readable_count; j++) {
3829 Deallocate((unsigned char*)*property_ptr+j);
3830 }
3831 Deallocate((unsigned char*)property_ptr);
3832 break;
3833 }
3834 }
3835 }
3836 assert(err != JVMTI_ERROR_NONE || readable_count == *count_ptr, "Bad readable property count");
3837 return err;
3838 } /* end GetSystemProperties */
3839
3840
3841 // property - pre-checked for null
3842 // value_ptr - pre-checked for null
3843 jvmtiError
3844 JvmtiEnv::GetSystemProperty(const char* property, char** value_ptr) {
3845 jvmtiError err = JVMTI_ERROR_NONE;
3846 const char *value;
3847
3848 // Return JVMTI_ERROR_NOT_AVAILABLE if property is not readable or doesn't exist.
3849 value = Arguments::PropertyList_get_readable_value(Arguments::system_properties(), property);
3850 if (value == nullptr) {
3851 err = JVMTI_ERROR_NOT_AVAILABLE;
3852 } else {
3853 err = allocate((strlen(value)+1) * sizeof(char), (unsigned char **)value_ptr);
3854 if (err == JVMTI_ERROR_NONE) {
3855 strcpy(*value_ptr, value);
3856 }
3857 }
3858 return err;
3859 } /* end GetSystemProperty */
3860
3861
3862 // property - pre-checked for null
3863 // value - null is a valid value, must be checked
3864 jvmtiError
3865 JvmtiEnv::SetSystemProperty(const char* property, const char* value_ptr) {
3866 for (SystemProperty* p = Arguments::system_properties(); p != nullptr; p = p->next()) {
3867 if (strcmp(property, p->key()) == 0) {
3868 if (p->writeable()) {
3869 if (p->set_value(value_ptr, AllocFailStrategy::RETURN_NULL)) {
3870 return JVMTI_ERROR_NONE;
3871 } else {
3872 return JVMTI_ERROR_OUT_OF_MEMORY;
3873 }
3874 } else {
3875 // We found a property, but it's not writeable
3876 return JVMTI_ERROR_NOT_AVAILABLE;
3877 }
3878 }
3879 }
3880
3881 // We cannot find a property of the given name
3882 return JVMTI_ERROR_NOT_AVAILABLE;
3883 } /* end SetSystemProperty */