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 JavaValue result(T_VOID);
1232 JavaCalls::call_virtual(&result,
1233 obj,
1234 vmClasses::Thread_klass(),
1235 vmSymbols::interrupt_method_name(),
1236 vmSymbols::void_method_signature(),
1237 current_thread);
1238
1239 return JVMTI_ERROR_NONE;
1240 }
1241
1242 // Really this should be a Java call to Thread.interrupt to ensure the same
1243 // semantics, however historically this has not been done for some reason.
1244 // So we continue with that (which means we don't interact with any Java-level
1245 // Interruptible object) but we must set the Java-level interrupted state.
1246 java_lang_Thread::set_interrupted(thread_obj, true);
1247 java_thread->interrupt();
1248
1249 return JVMTI_ERROR_NONE;
1250 } /* end InterruptThread */
1251
1252
1253 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
1254 // info_ptr - pre-checked for null
1255 jvmtiError
1256 JvmtiEnv::GetThreadInfo(jthread thread, jvmtiThreadInfo* info_ptr) {
1257 JavaThread* current_thread = JavaThread::current();
1258 ResourceMark rm(current_thread);
1259 HandleMark hm(current_thread);
1260 JavaThread* java_thread = nullptr;
1261 oop thread_oop = nullptr;
1262
1263 JvmtiVTMSTransitionDisabler disabler(thread);
1264 ThreadsListHandle tlh(current_thread);
1265
1266 // if thread is null the current thread is used
1267 if (thread == nullptr) {
1268 java_thread = JavaThread::current();
1269 thread_oop = get_vthread_or_thread_oop(java_thread);
1270 if (thread_oop == nullptr || !thread_oop->is_a(vmClasses::Thread_klass())) {
1271 return JVMTI_ERROR_INVALID_THREAD;
1272 }
1273 } else {
1274 jvmtiError err = JvmtiExport::cv_external_thread_to_JavaThread(tlh.list(), thread, &java_thread, &thread_oop);
1275 if (err != JVMTI_ERROR_NONE) {
1276 // We got an error code so we don't have a JavaThread *, but
1277 // only return an error from here if we didn't get a valid
1278 // thread_oop.
1279 // In the virtual thread case the cv_external_thread_to_JavaThread is expected to correctly set
1280 // the thread_oop and return JVMTI_ERROR_INVALID_THREAD which we ignore here.
1281 if (thread_oop == nullptr) {
1282 return err;
1283 }
1284 }
1285 }
1286 // We have a valid thread_oop so we can return some thread info.
1287
1288 Handle thread_obj(current_thread, thread_oop);
1289 Handle name;
1290 ThreadPriority priority;
1291 Handle thread_group;
1292 Handle context_class_loader;
1293 bool is_daemon;
1294
1295 name = Handle(current_thread, java_lang_Thread::name(thread_obj()));
1296
1297 if (java_lang_VirtualThread::is_instance(thread_obj())) {
1298 priority = (ThreadPriority)JVMTI_THREAD_NORM_PRIORITY;
1299 is_daemon = true;
1300 if (java_lang_VirtualThread::state(thread_obj()) == java_lang_VirtualThread::TERMINATED) {
1301 thread_group = Handle(current_thread, nullptr);
1302 } else {
1303 thread_group = Handle(current_thread, java_lang_Thread_Constants::get_VTHREAD_GROUP());
1304 }
1305 } else {
1306 priority = java_lang_Thread::priority(thread_obj());
1307 is_daemon = java_lang_Thread::is_daemon(thread_obj());
1308 if (java_lang_Thread::get_thread_status(thread_obj()) == JavaThreadStatus::TERMINATED) {
1309 thread_group = Handle(current_thread, nullptr);
1310 } else {
1311 thread_group = Handle(current_thread, java_lang_Thread::threadGroup(thread_obj()));
1312 }
1313 }
1314
1315 oop loader = java_lang_Thread::context_class_loader(thread_obj());
1316 context_class_loader = Handle(current_thread, loader);
1317
1318 { const char *n;
1319
1320 if (name() != nullptr) {
1321 n = java_lang_String::as_utf8_string(name());
1322 } else {
1323 size_t utf8_length = 0;
1324 n = UNICODE::as_utf8((jchar*) nullptr, utf8_length);
1325 }
1326
1327 info_ptr->name = (char *) jvmtiMalloc(strlen(n)+1);
1328 if (info_ptr->name == nullptr)
1329 return JVMTI_ERROR_OUT_OF_MEMORY;
1330
1331 strcpy(info_ptr->name, n);
1332 }
1333 info_ptr->is_daemon = is_daemon;
1334 info_ptr->priority = priority;
1335
1336 info_ptr->context_class_loader = (context_class_loader.is_null()) ? nullptr :
1337 jni_reference(context_class_loader);
1338 info_ptr->thread_group = jni_reference(thread_group);
1339
1340 return JVMTI_ERROR_NONE;
1341 } /* end GetThreadInfo */
1342
1343
1344 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
1345 // owned_monitor_count_ptr - pre-checked for null
1346 // owned_monitors_ptr - pre-checked for null
1347 jvmtiError
1348 JvmtiEnv::GetOwnedMonitorInfo(jthread thread, jint* owned_monitor_count_ptr, jobject** owned_monitors_ptr) {
1349 JavaThread* calling_thread = JavaThread::current();
1350 HandleMark hm(calling_thread);
1351
1352 JvmtiVTMSTransitionDisabler disabler(thread);
1353 ThreadsListHandle tlh(calling_thread);
1354
1355 JavaThread* java_thread = nullptr;
1356 oop thread_oop = nullptr;
1357 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, calling_thread, &java_thread, &thread_oop);
1358 if (err != JVMTI_ERROR_NONE) {
1359 return err;
1360 }
1361
1362 if (LockingMode == LM_LEGACY && java_thread == nullptr) {
1363 *owned_monitor_count_ptr = 0;
1364 return JVMTI_ERROR_NONE;
1365 }
1366
1367 // growable array of jvmti monitors info on the C-heap
1368 GrowableArray<jvmtiMonitorStackDepthInfo*> *owned_monitors_list =
1369 new (mtServiceability) GrowableArray<jvmtiMonitorStackDepthInfo*>(1, mtServiceability);
1370
1371 Handle thread_handle(calling_thread, thread_oop);
1372 EscapeBarrier eb(java_thread != nullptr, calling_thread, java_thread);
1373 if (!eb.deoptimize_objects(MaxJavaStackTraceDepth)) {
1374 delete owned_monitors_list;
1375 return JVMTI_ERROR_OUT_OF_MEMORY;
1376 }
1377 // get owned monitors info with handshake
1378 GetOwnedMonitorInfoClosure op(this, calling_thread, owned_monitors_list);
1379 JvmtiHandshake::execute(&op, &tlh, java_thread, thread_handle);
1380 err = op.result();
1381
1382 jint owned_monitor_count = owned_monitors_list->length();
1383 if (err == JVMTI_ERROR_NONE) {
1384 if ((err = allocate(owned_monitor_count * sizeof(jobject *),
1385 (unsigned char**)owned_monitors_ptr)) == JVMTI_ERROR_NONE) {
1386 // copy into the returned array
1387 for (int i = 0; i < owned_monitor_count; i++) {
1388 (*owned_monitors_ptr)[i] =
1389 ((jvmtiMonitorStackDepthInfo*)owned_monitors_list->at(i))->monitor;
1390 }
1391 *owned_monitor_count_ptr = owned_monitor_count;
1392 }
1393 }
1394 // clean up.
1395 for (int i = 0; i < owned_monitor_count; i++) {
1396 deallocate((unsigned char*)owned_monitors_list->at(i));
1397 }
1398 delete owned_monitors_list;
1399
1400 return err;
1401 } /* end GetOwnedMonitorInfo */
1402
1403
1404 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
1405 // monitor_info_count_ptr - pre-checked for null
1406 // monitor_info_ptr - pre-checked for null
1407 jvmtiError
1408 JvmtiEnv::GetOwnedMonitorStackDepthInfo(jthread thread, jint* monitor_info_count_ptr, jvmtiMonitorStackDepthInfo** monitor_info_ptr) {
1409 JavaThread* calling_thread = JavaThread::current();
1410 HandleMark hm(calling_thread);
1411
1412 JvmtiVTMSTransitionDisabler disabler(thread);
1413 ThreadsListHandle tlh(calling_thread);
1414
1415 JavaThread* java_thread = nullptr;
1416 oop thread_oop = nullptr;
1417 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, calling_thread, &java_thread, &thread_oop);
1418 if (err != JVMTI_ERROR_NONE) {
1419 return err;
1420 }
1421
1422 if (LockingMode == LM_LEGACY && java_thread == nullptr) {
1423 *monitor_info_count_ptr = 0;
1424 return JVMTI_ERROR_NONE;
1425 }
1426
1427 // growable array of jvmti monitors info on the C-heap
1428 GrowableArray<jvmtiMonitorStackDepthInfo*> *owned_monitors_list =
1429 new (mtServiceability) GrowableArray<jvmtiMonitorStackDepthInfo*>(1, mtServiceability);
1430
1431 Handle thread_handle(calling_thread, thread_oop);
1432 EscapeBarrier eb(java_thread != nullptr, calling_thread, java_thread);
1433 if (!eb.deoptimize_objects(MaxJavaStackTraceDepth)) {
1434 delete owned_monitors_list;
1435 return JVMTI_ERROR_OUT_OF_MEMORY;
1436 }
1437 // get owned monitors info with handshake
1438 GetOwnedMonitorInfoClosure op(this, calling_thread, owned_monitors_list);
1439 JvmtiHandshake::execute(&op, &tlh, java_thread, thread_handle);
1440 err = op.result();
1441
1442 jint owned_monitor_count = owned_monitors_list->length();
1443 if (err == JVMTI_ERROR_NONE) {
1444 if ((err = allocate(owned_monitor_count * sizeof(jvmtiMonitorStackDepthInfo),
1445 (unsigned char**)monitor_info_ptr)) == JVMTI_ERROR_NONE) {
1446 // copy to output array.
1447 for (int i = 0; i < owned_monitor_count; i++) {
1448 (*monitor_info_ptr)[i].monitor =
1449 ((jvmtiMonitorStackDepthInfo*)owned_monitors_list->at(i))->monitor;
1450 (*monitor_info_ptr)[i].stack_depth =
1451 ((jvmtiMonitorStackDepthInfo*)owned_monitors_list->at(i))->stack_depth;
1452 }
1453 }
1454 *monitor_info_count_ptr = owned_monitor_count;
1455 }
1456
1457 // clean up.
1458 for (int i = 0; i < owned_monitor_count; i++) {
1459 deallocate((unsigned char*)owned_monitors_list->at(i));
1460 }
1461 delete owned_monitors_list;
1462
1463 return err;
1464 } /* end GetOwnedMonitorStackDepthInfo */
1465
1466
1467 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
1468 // monitor_ptr - pre-checked for null
1469 jvmtiError
1470 JvmtiEnv::GetCurrentContendedMonitor(jthread thread, jobject* monitor_ptr) {
1471 JavaThread* current = JavaThread::current();
1472
1473 *monitor_ptr = nullptr;
1474
1475 // get contended monitor information with handshake
1476 GetCurrentContendedMonitorClosure op(this, current, monitor_ptr);
1477 JvmtiHandshake::execute(&op, thread);
1478 return op.result();
1479 } /* end GetCurrentContendedMonitor */
1480
1481
1482 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
1483 // proc - pre-checked for null
1484 // arg - null is a valid value, must be checked
1485 jvmtiError
1486 JvmtiEnv::RunAgentThread(jthread thread, jvmtiStartFunction proc, const void* arg, jint priority) {
1487 JavaThread* current_thread = JavaThread::current();
1488
1489 JavaThread* java_thread = nullptr;
1490 oop thread_oop = nullptr;
1491 ThreadsListHandle tlh(current_thread);
1492 jvmtiError err = JvmtiExport::cv_external_thread_to_JavaThread(tlh.list(), thread, &java_thread, &thread_oop);
1493 if (err != JVMTI_ERROR_NONE) {
1494 // We got an error code so we don't have a JavaThread *, but
1495 // only return an error from here if we didn't get a valid
1496 // thread_oop.
1497 if (thread_oop == nullptr) {
1498 return err;
1499 }
1500 // We have a valid thread_oop.
1501 }
1502
1503 if (thread_oop->is_a(vmClasses::BaseVirtualThread_klass())) {
1504 // No support for virtual threads.
1505 return JVMTI_ERROR_UNSUPPORTED_OPERATION;
1506 }
1507 if (java_thread != nullptr) {
1508 // 'thread' refers to an existing JavaThread.
1509 return JVMTI_ERROR_INVALID_THREAD;
1510 }
1511
1512 if (priority < JVMTI_THREAD_MIN_PRIORITY || priority > JVMTI_THREAD_MAX_PRIORITY) {
1513 return JVMTI_ERROR_INVALID_PRIORITY;
1514 }
1515
1516 Handle thread_hndl(current_thread, thread_oop);
1517
1518 JvmtiAgentThread* new_thread = new JvmtiAgentThread(this, proc, arg);
1519
1520 // At this point it may be possible that no osthread was created for the
1521 // JavaThread due to lack of resources.
1522 if (new_thread->osthread() == nullptr) {
1523 // The new thread is not known to Thread-SMR yet so we can just delete.
1524 delete new_thread;
1525 return JVMTI_ERROR_OUT_OF_MEMORY;
1526 }
1527
1528 JavaThread::start_internal_daemon(current_thread, new_thread, thread_hndl,
1529 (ThreadPriority)priority);
1530
1531 return JVMTI_ERROR_NONE;
1532 } /* end RunAgentThread */
1533
1534 //
1535 // Thread Group functions
1536 //
1537
1538 // group_count_ptr - pre-checked for null
1539 // groups_ptr - pre-checked for null
1540 jvmtiError
1541 JvmtiEnv::GetTopThreadGroups(jint* group_count_ptr, jthreadGroup** groups_ptr) {
1542 JavaThread* current_thread = JavaThread::current();
1543
1544 // Only one top level thread group now.
1545 *group_count_ptr = 1;
1546
1547 // Allocate memory to store global-refs to the thread groups.
1548 // Assume this area is freed by caller.
1549 *groups_ptr = (jthreadGroup *) jvmtiMalloc((sizeof(jthreadGroup)) * (*group_count_ptr));
1550
1551 NULL_CHECK(*groups_ptr, JVMTI_ERROR_OUT_OF_MEMORY);
1552
1553 // Convert oop to Handle, then convert Handle to global-ref.
1554 {
1555 HandleMark hm(current_thread);
1556 Handle system_thread_group(current_thread, Universe::system_thread_group());
1557 *groups_ptr[0] = jni_reference(system_thread_group);
1558 }
1559
1560 return JVMTI_ERROR_NONE;
1561 } /* end GetTopThreadGroups */
1562
1563
1564 // info_ptr - pre-checked for null
1565 jvmtiError
1566 JvmtiEnv::GetThreadGroupInfo(jthreadGroup group, jvmtiThreadGroupInfo* info_ptr) {
1567 Thread* current_thread = Thread::current();
1568 ResourceMark rm(current_thread);
1569 HandleMark hm(current_thread);
1570
1571 Handle group_obj (current_thread, JNIHandles::resolve_external_guard(group));
1572 NULL_CHECK(group_obj(), JVMTI_ERROR_INVALID_THREAD_GROUP);
1573
1574 const char* name;
1575 Handle parent_group;
1576 bool is_daemon;
1577 ThreadPriority max_priority;
1578
1579 name = java_lang_ThreadGroup::name(group_obj());
1580 parent_group = Handle(current_thread, java_lang_ThreadGroup::parent(group_obj()));
1581 is_daemon = java_lang_ThreadGroup::is_daemon(group_obj());
1582 max_priority = java_lang_ThreadGroup::maxPriority(group_obj());
1583
1584 info_ptr->is_daemon = is_daemon;
1585 info_ptr->max_priority = max_priority;
1586 info_ptr->parent = jni_reference(parent_group);
1587
1588 if (name != nullptr) {
1589 info_ptr->name = (char*)jvmtiMalloc(strlen(name)+1);
1590 NULL_CHECK(info_ptr->name, JVMTI_ERROR_OUT_OF_MEMORY);
1591 strcpy(info_ptr->name, name);
1592 } else {
1593 info_ptr->name = nullptr;
1594 }
1595
1596 return JVMTI_ERROR_NONE;
1597 } /* end GetThreadGroupInfo */
1598
1599 // thread_count_ptr - pre-checked for null
1600 // threads_ptr - pre-checked for null
1601 // group_count_ptr - pre-checked for null
1602 // groups_ptr - pre-checked for null
1603 jvmtiError
1604 JvmtiEnv::GetThreadGroupChildren(jthreadGroup group, jint* thread_count_ptr, jthread** threads_ptr, jint* group_count_ptr, jthreadGroup** groups_ptr) {
1605 jvmtiError err;
1606 JavaThread* current_thread = JavaThread::current();
1607 oop group_obj = JNIHandles::resolve_external_guard(group);
1608 NULL_CHECK(group_obj, JVMTI_ERROR_INVALID_THREAD_GROUP);
1609
1610 Handle *thread_objs = nullptr;
1611 objArrayHandle group_objs;
1612 jint nthreads = 0;
1613 jint ngroups = 0;
1614 int hidden_threads = 0;
1615
1616 ResourceMark rm(current_thread);
1617 HandleMark hm(current_thread);
1618
1619 Handle group_hdl(current_thread, group_obj);
1620
1621 err = get_live_threads(current_thread, group_hdl, &nthreads, &thread_objs);
1622 if (err != JVMTI_ERROR_NONE) {
1623 return err;
1624 }
1625 err = get_subgroups(current_thread, group_hdl, &ngroups, &group_objs);
1626 if (err != JVMTI_ERROR_NONE) {
1627 return err;
1628 }
1629
1630 *group_count_ptr = ngroups;
1631 *thread_count_ptr = nthreads;
1632 *threads_ptr = new_jthreadArray(nthreads, thread_objs);
1633 *groups_ptr = new_jthreadGroupArray(ngroups, group_objs);
1634 if (nthreads > 0 && *threads_ptr == nullptr) {
1635 return JVMTI_ERROR_OUT_OF_MEMORY;
1636 }
1637 if (ngroups > 0 && *groups_ptr == nullptr) {
1638 return JVMTI_ERROR_OUT_OF_MEMORY;
1639 }
1640
1641 return JVMTI_ERROR_NONE;
1642 } /* end GetThreadGroupChildren */
1643
1644
1645 //
1646 // Stack Frame functions
1647 //
1648
1649 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
1650 // max_frame_count - pre-checked to be greater than or equal to 0
1651 // frame_buffer - pre-checked for null
1652 // count_ptr - pre-checked for null
1653 jvmtiError
1654 JvmtiEnv::GetStackTrace(jthread thread, jint start_depth, jint max_frame_count, jvmtiFrameInfo* frame_buffer, jint* count_ptr) {
1655 GetStackTraceClosure op(this, start_depth, max_frame_count, frame_buffer, count_ptr);
1656 JvmtiHandshake::execute(&op, thread);
1657 return op.result();
1658 } /* end GetStackTrace */
1659
1660
1661 // max_frame_count - pre-checked to be greater than or equal to 0
1662 // stack_info_ptr - pre-checked for null
1663 // thread_count_ptr - pre-checked for null
1664 jvmtiError
1665 JvmtiEnv::GetAllStackTraces(jint max_frame_count, jvmtiStackInfo** stack_info_ptr, jint* thread_count_ptr) {
1666 jvmtiError err = JVMTI_ERROR_NONE;
1667 JavaThread* calling_thread = JavaThread::current();
1668
1669 // JVMTI get stack traces at safepoint.
1670 VM_GetAllStackTraces op(this, calling_thread, max_frame_count);
1671 VMThread::execute(&op);
1672 *thread_count_ptr = op.final_thread_count();
1673 *stack_info_ptr = op.stack_info();
1674 err = op.result();
1675 return err;
1676 } /* end GetAllStackTraces */
1677
1678
1679 // thread_count - pre-checked to be greater than or equal to 0
1680 // thread_list - pre-checked for null
1681 // max_frame_count - pre-checked to be greater than or equal to 0
1682 // stack_info_ptr - pre-checked for null
1683 jvmtiError
1684 JvmtiEnv::GetThreadListStackTraces(jint thread_count, const jthread* thread_list, jint max_frame_count, jvmtiStackInfo** stack_info_ptr) {
1685 jvmtiError err = JVMTI_ERROR_NONE;
1686
1687 if (thread_count == 1) {
1688 // Use direct handshake if we need to get only one stack trace.
1689 JavaThread *current_thread = JavaThread::current();
1690
1691 jthread thread = thread_list[0];
1692
1693 GetSingleStackTraceClosure op(this, current_thread, thread, max_frame_count);
1694 JvmtiHandshake::execute(&op, thread);
1695 err = op.result();
1696 if (err == JVMTI_ERROR_NONE) {
1697 *stack_info_ptr = op.stack_info();
1698 }
1699 } else {
1700 JvmtiVTMSTransitionDisabler disabler;
1701
1702 // JVMTI get stack traces at safepoint.
1703 VM_GetThreadListStackTraces op(this, thread_count, thread_list, max_frame_count);
1704 VMThread::execute(&op);
1705 err = op.result();
1706 if (err == JVMTI_ERROR_NONE) {
1707 *stack_info_ptr = op.stack_info();
1708 }
1709 }
1710 return err;
1711 } /* end GetThreadListStackTraces */
1712
1713
1714 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
1715 // count_ptr - pre-checked for null
1716 jvmtiError
1717 JvmtiEnv::GetFrameCount(jthread thread, jint* count_ptr) {
1718 GetFrameCountClosure op(this, count_ptr);
1719 JvmtiHandshake::execute(&op, thread);
1720 return op.result();
1721 } /* end GetFrameCount */
1722
1723
1724 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
1725 jvmtiError
1726 JvmtiEnv::PopFrame(jthread thread) {
1727 JavaThread* current_thread = JavaThread::current();
1728 HandleMark hm(current_thread);
1729
1730 if (thread == nullptr) {
1731 return JVMTI_ERROR_INVALID_THREAD;
1732 }
1733 JvmtiVTMSTransitionDisabler disabler(thread);
1734 ThreadsListHandle tlh(current_thread);
1735
1736 JavaThread* java_thread = nullptr;
1737 oop thread_obj = nullptr;
1738 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, current_thread, &java_thread, &thread_obj);
1739 Handle thread_handle(current_thread, thread_obj);
1740
1741 if (err != JVMTI_ERROR_NONE) {
1742 return err;
1743 }
1744 bool self = java_thread == current_thread;
1745
1746 err = check_non_suspended_or_opaque_frame(java_thread, thread_obj, self);
1747 if (err != JVMTI_ERROR_NONE) {
1748 return err;
1749 }
1750
1751 // retrieve or create the state
1752 JvmtiThreadState* state = JvmtiThreadState::state_for(java_thread);
1753 if (state == nullptr) {
1754 return JVMTI_ERROR_THREAD_NOT_ALIVE;
1755 }
1756
1757 // Eagerly reallocate scalar replaced objects.
1758 EscapeBarrier eb(true, current_thread, java_thread);
1759 if (!eb.deoptimize_objects(1)) {
1760 // Reallocation of scalar replaced objects failed -> return with error
1761 return JVMTI_ERROR_OUT_OF_MEMORY;
1762 }
1763
1764 MutexLocker mu(JvmtiThreadState_lock);
1765 UpdateForPopTopFrameClosure op(state);
1766 JvmtiHandshake::execute(&op, &tlh, java_thread, thread_handle);
1767 return op.result();
1768 } /* end PopFrame */
1769
1770
1771 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
1772 // depth - pre-checked as non-negative
1773 // method_ptr - pre-checked for null
1774 // location_ptr - pre-checked for null
1775 jvmtiError
1776 JvmtiEnv::GetFrameLocation(jthread thread, jint depth, jmethodID* method_ptr, jlocation* location_ptr) {
1777 GetFrameLocationClosure op(this, depth, method_ptr, location_ptr);
1778 JvmtiHandshake::execute(&op, thread);
1779 return op.result();
1780 } /* end GetFrameLocation */
1781
1782
1783 // Threads_lock NOT held, java_thread not protected by lock
1784 // depth - pre-checked as non-negative
1785 jvmtiError
1786 JvmtiEnv::NotifyFramePop(jthread thread, jint depth) {
1787 ResourceMark rm;
1788 JvmtiVTMSTransitionDisabler disabler(thread);
1789 JavaThread* current = JavaThread::current();
1790 ThreadsListHandle tlh(current);
1791
1792 JavaThread* java_thread = nullptr;
1793 oop thread_obj = nullptr;
1794 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, current, &java_thread, &thread_obj);
1795 if (err != JVMTI_ERROR_NONE) {
1796 return err;
1797 }
1798
1799 HandleMark hm(current);
1800 Handle thread_handle(current, thread_obj);
1801 JvmtiThreadState *state = JvmtiThreadState::state_for(java_thread, thread_handle);
1802 if (state == nullptr) {
1803 return JVMTI_ERROR_THREAD_NOT_ALIVE;
1804 }
1805
1806 SetOrClearFramePopClosure op(this, state, true /* set */, depth);
1807 MutexLocker mu(current, JvmtiThreadState_lock);
1808 JvmtiHandshake::execute(&op, &tlh, java_thread, thread_handle);
1809 return op.result();
1810 } /* end NotifyFramePop */
1811
1812 // Threads_lock NOT held, java_thread not protected by lock
1813 jvmtiError
1814 JvmtiEnv::ClearAllFramePops(jthread thread) {
1815 ResourceMark rm;
1816 JvmtiVTMSTransitionDisabler disabler(thread);
1817 JavaThread* current = JavaThread::current();
1818 ThreadsListHandle tlh(current);
1819
1820 JavaThread* java_thread = nullptr;
1821 oop thread_obj = nullptr;
1822 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, current, &java_thread, &thread_obj);
1823 if (err != JVMTI_ERROR_NONE) {
1824 return err;
1825 }
1826
1827 HandleMark hm(current);
1828 Handle thread_handle(current, thread_obj);
1829 JvmtiThreadState *state = JvmtiThreadState::state_for(java_thread, thread_handle);
1830 if (state == nullptr) {
1831 return JVMTI_ERROR_THREAD_NOT_ALIVE;
1832 }
1833
1834 SetOrClearFramePopClosure op(this, state, false /* clear all frame pops*/);
1835 MutexLocker mu(current, JvmtiThreadState_lock);
1836 JvmtiHandshake::execute(&op, &tlh, java_thread, thread_handle);
1837 return op.result();
1838 } /* end ClearAllFramePops */
1839
1840 //
1841 // Force Early Return functions
1842 //
1843
1844 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
1845 jvmtiError
1846 JvmtiEnv::ForceEarlyReturnObject(jthread thread, jobject value) {
1847 jvalue val;
1848 val.l = value;
1849 return force_early_return(thread, val, atos);
1850 } /* end ForceEarlyReturnObject */
1851
1852
1853 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
1854 jvmtiError
1855 JvmtiEnv::ForceEarlyReturnInt(jthread thread, jint value) {
1856 jvalue val;
1857 val.i = value;
1858 return force_early_return(thread, val, itos);
1859 } /* end ForceEarlyReturnInt */
1860
1861
1862 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
1863 jvmtiError
1864 JvmtiEnv::ForceEarlyReturnLong(jthread thread, jlong value) {
1865 jvalue val;
1866 val.j = value;
1867 return force_early_return(thread, val, ltos);
1868 } /* end ForceEarlyReturnLong */
1869
1870
1871 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
1872 jvmtiError
1873 JvmtiEnv::ForceEarlyReturnFloat(jthread thread, jfloat value) {
1874 jvalue val;
1875 val.f = value;
1876 return force_early_return(thread, val, ftos);
1877 } /* end ForceEarlyReturnFloat */
1878
1879
1880 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
1881 jvmtiError
1882 JvmtiEnv::ForceEarlyReturnDouble(jthread thread, jdouble value) {
1883 jvalue val;
1884 val.d = value;
1885 return force_early_return(thread, val, dtos);
1886 } /* end ForceEarlyReturnDouble */
1887
1888
1889 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
1890 jvmtiError
1891 JvmtiEnv::ForceEarlyReturnVoid(jthread thread) {
1892 jvalue val;
1893 val.j = 0L;
1894 return force_early_return(thread, val, vtos);
1895 } /* end ForceEarlyReturnVoid */
1896
1897
1898 //
1899 // Heap functions
1900 //
1901
1902 // klass - null is a valid value, must be checked
1903 // initial_object - null is a valid value, must be checked
1904 // callbacks - pre-checked for null
1905 // user_data - null is a valid value, must be checked
1906 jvmtiError
1907 JvmtiEnv::FollowReferences(jint heap_filter, jclass klass, jobject initial_object, const jvmtiHeapCallbacks* callbacks, const void* user_data) {
1908 // check klass if provided
1909 Klass* k = nullptr;
1910 if (klass != nullptr) {
1911 oop k_mirror = JNIHandles::resolve_external_guard(klass);
1912 if (k_mirror == nullptr) {
1913 return JVMTI_ERROR_INVALID_CLASS;
1914 }
1915 if (java_lang_Class::is_primitive(k_mirror)) {
1916 return JVMTI_ERROR_NONE;
1917 }
1918 k = java_lang_Class::as_Klass(k_mirror);
1919 if (klass == nullptr) {
1920 return JVMTI_ERROR_INVALID_CLASS;
1921 }
1922 }
1923
1924 if (initial_object != nullptr) {
1925 oop init_obj = JNIHandles::resolve_external_guard(initial_object);
1926 if (init_obj == nullptr) {
1927 return JVMTI_ERROR_INVALID_OBJECT;
1928 }
1929 }
1930
1931 Thread *thread = Thread::current();
1932 HandleMark hm(thread);
1933
1934 TraceTime t("FollowReferences", TRACETIME_LOG(Debug, jvmti, objecttagging));
1935 JvmtiTagMap::tag_map_for(this)->follow_references(heap_filter, k, initial_object, callbacks, user_data);
1936 return JVMTI_ERROR_NONE;
1937 } /* end FollowReferences */
1938
1939
1940 // klass - null is a valid value, must be checked
1941 // callbacks - pre-checked for null
1942 // user_data - null is a valid value, must be checked
1943 jvmtiError
1944 JvmtiEnv::IterateThroughHeap(jint heap_filter, jclass klass, const jvmtiHeapCallbacks* callbacks, const void* user_data) {
1945 // check klass if provided
1946 Klass* k = nullptr;
1947 if (klass != nullptr) {
1948 oop k_mirror = JNIHandles::resolve_external_guard(klass);
1949 if (k_mirror == nullptr) {
1950 return JVMTI_ERROR_INVALID_CLASS;
1951 }
1952 if (java_lang_Class::is_primitive(k_mirror)) {
1953 return JVMTI_ERROR_NONE;
1954 }
1955 k = java_lang_Class::as_Klass(k_mirror);
1956 if (k == nullptr) {
1957 return JVMTI_ERROR_INVALID_CLASS;
1958 }
1959 }
1960
1961 TraceTime t("IterateThroughHeap", TRACETIME_LOG(Debug, jvmti, objecttagging));
1962 JvmtiTagMap::tag_map_for(this)->iterate_through_heap(heap_filter, k, callbacks, user_data);
1963 return JVMTI_ERROR_NONE;
1964 } /* end IterateThroughHeap */
1965
1966
1967 // tag_ptr - pre-checked for null
1968 jvmtiError
1969 JvmtiEnv::GetTag(jobject object, jlong* tag_ptr) {
1970 oop o = JNIHandles::resolve_external_guard(object);
1971 NULL_CHECK(o, JVMTI_ERROR_INVALID_OBJECT);
1972 *tag_ptr = JvmtiTagMap::tag_map_for(this)->get_tag(object);
1973 return JVMTI_ERROR_NONE;
1974 } /* end GetTag */
1975
1976
1977 jvmtiError
1978 JvmtiEnv::SetTag(jobject object, jlong tag) {
1979 oop o = JNIHandles::resolve_external_guard(object);
1980 NULL_CHECK(o, JVMTI_ERROR_INVALID_OBJECT);
1981 JvmtiTagMap::tag_map_for(this)->set_tag(object, tag);
1982 return JVMTI_ERROR_NONE;
1983 } /* end SetTag */
1984
1985
1986 // tag_count - pre-checked to be greater than or equal to 0
1987 // tags - pre-checked for null
1988 // count_ptr - pre-checked for null
1989 // object_result_ptr - null is a valid value, must be checked
1990 // tag_result_ptr - null is a valid value, must be checked
1991 jvmtiError
1992 JvmtiEnv::GetObjectsWithTags(jint tag_count, const jlong* tags, jint* count_ptr, jobject** object_result_ptr, jlong** tag_result_ptr) {
1993 TraceTime t("GetObjectsWithTags", TRACETIME_LOG(Debug, jvmti, objecttagging));
1994 return JvmtiTagMap::tag_map_for(this)->get_objects_with_tags((jlong*)tags, tag_count, count_ptr, object_result_ptr, tag_result_ptr);
1995 } /* end GetObjectsWithTags */
1996
1997
1998 jvmtiError
1999 JvmtiEnv::ForceGarbageCollection() {
2000 Universe::heap()->collect(GCCause::_jvmti_force_gc);
2001 return JVMTI_ERROR_NONE;
2002 } /* end ForceGarbageCollection */
2003
2004
2005 //
2006 // Heap (1.0) functions
2007 //
2008
2009 // object_reference_callback - pre-checked for null
2010 // user_data - null is a valid value, must be checked
2011 jvmtiError
2012 JvmtiEnv::IterateOverObjectsReachableFromObject(jobject object, jvmtiObjectReferenceCallback object_reference_callback, const void* user_data) {
2013 oop o = JNIHandles::resolve_external_guard(object);
2014 NULL_CHECK(o, JVMTI_ERROR_INVALID_OBJECT);
2015 JvmtiTagMap::tag_map_for(this)->iterate_over_objects_reachable_from_object(object, object_reference_callback, user_data);
2016 return JVMTI_ERROR_NONE;
2017 } /* end IterateOverObjectsReachableFromObject */
2018
2019
2020 // heap_root_callback - null is a valid value, must be checked
2021 // stack_ref_callback - null is a valid value, must be checked
2022 // object_ref_callback - null is a valid value, must be checked
2023 // user_data - null is a valid value, must be checked
2024 jvmtiError
2025 JvmtiEnv::IterateOverReachableObjects(jvmtiHeapRootCallback heap_root_callback, jvmtiStackReferenceCallback stack_ref_callback, jvmtiObjectReferenceCallback object_ref_callback, const void* user_data) {
2026 TraceTime t("IterateOverReachableObjects", TRACETIME_LOG(Debug, jvmti, objecttagging));
2027 JvmtiTagMap::tag_map_for(this)->iterate_over_reachable_objects(heap_root_callback, stack_ref_callback, object_ref_callback, user_data);
2028 return JVMTI_ERROR_NONE;
2029 } /* end IterateOverReachableObjects */
2030
2031
2032 // heap_object_callback - pre-checked for null
2033 // user_data - null is a valid value, must be checked
2034 jvmtiError
2035 JvmtiEnv::IterateOverHeap(jvmtiHeapObjectFilter object_filter, jvmtiHeapObjectCallback heap_object_callback, const void* user_data) {
2036 TraceTime t("IterateOverHeap", TRACETIME_LOG(Debug, jvmti, objecttagging));
2037 Thread *thread = Thread::current();
2038 HandleMark hm(thread);
2039 JvmtiTagMap::tag_map_for(this)->iterate_over_heap(object_filter, nullptr, heap_object_callback, user_data);
2040 return JVMTI_ERROR_NONE;
2041 } /* end IterateOverHeap */
2042
2043
2044 // k_mirror - may be primitive, this must be checked
2045 // heap_object_callback - pre-checked for null
2046 // user_data - null is a valid value, must be checked
2047 jvmtiError
2048 JvmtiEnv::IterateOverInstancesOfClass(oop k_mirror, jvmtiHeapObjectFilter object_filter, jvmtiHeapObjectCallback heap_object_callback, const void* user_data) {
2049 if (java_lang_Class::is_primitive(k_mirror)) {
2050 // DO PRIMITIVE CLASS PROCESSING
2051 return JVMTI_ERROR_NONE;
2052 }
2053 Klass* klass = java_lang_Class::as_Klass(k_mirror);
2054 if (klass == nullptr) {
2055 return JVMTI_ERROR_INVALID_CLASS;
2056 }
2057 TraceTime t("IterateOverInstancesOfClass", TRACETIME_LOG(Debug, jvmti, objecttagging));
2058 JvmtiTagMap::tag_map_for(this)->iterate_over_heap(object_filter, klass, heap_object_callback, user_data);
2059 return JVMTI_ERROR_NONE;
2060 } /* end IterateOverInstancesOfClass */
2061
2062
2063 //
2064 // Local Variable functions
2065 //
2066
2067 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
2068 // depth - pre-checked as non-negative
2069 // value_ptr - pre-checked for null
2070 jvmtiError
2071 JvmtiEnv::GetLocalObject(jthread thread, jint depth, jint slot, jobject* value_ptr) {
2072 JavaThread* current_thread = JavaThread::current();
2073 // rm object is created to clean up the javaVFrame created in
2074 // doit_prologue(), but after doit() is finished with it.
2075 ResourceMark rm(current_thread);
2076 HandleMark hm(current_thread);
2077 JvmtiVTMSTransitionDisabler disabler(thread);
2078 ThreadsListHandle tlh(current_thread);
2079
2080 JavaThread* java_thread = nullptr;
2081 oop thread_obj = nullptr;
2082 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, current_thread, &java_thread, &thread_obj);
2083 if (err != JVMTI_ERROR_NONE) {
2084 return err;
2085 }
2086 bool self = is_JavaThread_current(java_thread, thread_obj);
2087
2088 if (java_lang_VirtualThread::is_instance(thread_obj)) {
2089 VM_VirtualThreadGetOrSetLocal op(this, Handle(current_thread, thread_obj),
2090 current_thread, depth, slot, self);
2091 VMThread::execute(&op);
2092 err = op.result();
2093 if (err == JVMTI_ERROR_NONE) {
2094 *value_ptr = op.value().l;
2095 }
2096 } else {
2097 // Support for ordinary threads
2098 VM_GetOrSetLocal op(java_thread, current_thread, depth, slot, self);
2099 VMThread::execute(&op);
2100 err = op.result();
2101 if (err == JVMTI_ERROR_NONE) {
2102 *value_ptr = op.value().l;
2103 }
2104 }
2105 return err;
2106 } /* end GetLocalObject */
2107
2108 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
2109 // depth - pre-checked as non-negative
2110 // value - pre-checked for null
2111 jvmtiError
2112 JvmtiEnv::GetLocalInstance(jthread thread, jint depth, jobject* value_ptr){
2113 JavaThread* current_thread = JavaThread::current();
2114 // rm object is created to clean up the javaVFrame created in
2115 // doit_prologue(), but after doit() is finished with it.
2116 ResourceMark rm(current_thread);
2117 HandleMark hm(current_thread);
2118 JvmtiVTMSTransitionDisabler disabler(thread);
2119 ThreadsListHandle tlh(current_thread);
2120
2121 JavaThread* java_thread = nullptr;
2122 oop thread_obj = nullptr;
2123 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, current_thread, &java_thread, &thread_obj);
2124 if (err != JVMTI_ERROR_NONE) {
2125 return err;
2126 }
2127 bool self = is_JavaThread_current(java_thread, thread_obj);
2128
2129 if (java_lang_VirtualThread::is_instance(thread_obj)) {
2130 VM_VirtualThreadGetReceiver op(this, Handle(current_thread, thread_obj),
2131 current_thread, depth, self);
2132 VMThread::execute(&op);
2133 err = op.result();
2134 if (err == JVMTI_ERROR_NONE) {
2135 *value_ptr = op.value().l;
2136 }
2137 } else {
2138 // Support for ordinary threads
2139 VM_GetReceiver op(java_thread, current_thread, depth, self);
2140 VMThread::execute(&op);
2141 err = op.result();
2142 if (err == JVMTI_ERROR_NONE) {
2143 *value_ptr = op.value().l;
2144 }
2145 }
2146 return err;
2147 } /* end GetLocalInstance */
2148
2149
2150 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
2151 // depth - pre-checked as non-negative
2152 // value_ptr - pre-checked for null
2153 jvmtiError
2154 JvmtiEnv::GetLocalInt(jthread thread, jint depth, jint slot, jint* value_ptr) {
2155 JavaThread* current_thread = JavaThread::current();
2156 // rm object is created to clean up the javaVFrame created in
2157 // doit_prologue(), but after doit() is finished with it.
2158 ResourceMark rm(current_thread);
2159 HandleMark hm(current_thread);
2160 JvmtiVTMSTransitionDisabler disabler(thread);
2161 ThreadsListHandle tlh(current_thread);
2162
2163 JavaThread* java_thread = nullptr;
2164 oop thread_obj = nullptr;
2165 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, current_thread, &java_thread, &thread_obj);
2166 if (err != JVMTI_ERROR_NONE) {
2167 return err;
2168 }
2169 bool self = is_JavaThread_current(java_thread, thread_obj);
2170
2171 if (java_lang_VirtualThread::is_instance(thread_obj)) {
2172 VM_VirtualThreadGetOrSetLocal op(this, Handle(current_thread, thread_obj),
2173 depth, slot, T_INT, self);
2174 VMThread::execute(&op);
2175 err = op.result();
2176 if (err == JVMTI_ERROR_NONE) {
2177 *value_ptr = op.value().i;
2178 }
2179 } else {
2180 // Support for ordinary threads
2181 VM_GetOrSetLocal op(java_thread, depth, slot, T_INT, self);
2182 VMThread::execute(&op);
2183 err = op.result();
2184 if (err == JVMTI_ERROR_NONE) {
2185 *value_ptr = op.value().i;
2186 }
2187 }
2188 return err;
2189 } /* end GetLocalInt */
2190
2191
2192 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
2193 // depth - pre-checked as non-negative
2194 // value_ptr - pre-checked for null
2195 jvmtiError
2196 JvmtiEnv::GetLocalLong(jthread thread, jint depth, jint slot, jlong* value_ptr) {
2197 JavaThread* current_thread = JavaThread::current();
2198 // rm object is created to clean up the javaVFrame created in
2199 // doit_prologue(), but after doit() is finished with it.
2200 ResourceMark rm(current_thread);
2201 HandleMark hm(current_thread);
2202 JvmtiVTMSTransitionDisabler disabler(thread);
2203 ThreadsListHandle tlh(current_thread);
2204
2205 JavaThread* java_thread = nullptr;
2206 oop thread_obj = nullptr;
2207 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, current_thread, &java_thread, &thread_obj);
2208 if (err != JVMTI_ERROR_NONE) {
2209 return err;
2210 }
2211 bool self = is_JavaThread_current(java_thread, thread_obj);
2212
2213 if (java_lang_VirtualThread::is_instance(thread_obj)) {
2214 VM_VirtualThreadGetOrSetLocal op(this, Handle(current_thread, thread_obj),
2215 depth, slot, T_LONG, self);
2216 VMThread::execute(&op);
2217 err = op.result();
2218 if (err == JVMTI_ERROR_NONE) {
2219 *value_ptr = op.value().j;
2220 }
2221 } else {
2222 // Support for ordinary threads
2223 VM_GetOrSetLocal op(java_thread, depth, slot, T_LONG, self);
2224 VMThread::execute(&op);
2225 err = op.result();
2226 if (err == JVMTI_ERROR_NONE) {
2227 *value_ptr = op.value().j;
2228 }
2229 }
2230 return err;
2231 } /* end GetLocalLong */
2232
2233
2234 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
2235 // depth - pre-checked as non-negative
2236 // value_ptr - pre-checked for null
2237 jvmtiError
2238 JvmtiEnv::GetLocalFloat(jthread thread, jint depth, jint slot, jfloat* value_ptr) {
2239 JavaThread* current_thread = JavaThread::current();
2240 // rm object is created to clean up the javaVFrame created in
2241 // doit_prologue(), but after doit() is finished with it.
2242 ResourceMark rm(current_thread);
2243 HandleMark hm(current_thread);
2244 JvmtiVTMSTransitionDisabler disabler(thread);
2245 ThreadsListHandle tlh(current_thread);
2246
2247 JavaThread* java_thread = nullptr;
2248 oop thread_obj = nullptr;
2249 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, current_thread, &java_thread, &thread_obj);
2250 if (err != JVMTI_ERROR_NONE) {
2251 return err;
2252 }
2253 bool self = is_JavaThread_current(java_thread, thread_obj);
2254
2255 if (java_lang_VirtualThread::is_instance(thread_obj)) {
2256 VM_VirtualThreadGetOrSetLocal op(this, Handle(current_thread, thread_obj),
2257 depth, slot, T_FLOAT, self);
2258 VMThread::execute(&op);
2259 err = op.result();
2260 if (err == JVMTI_ERROR_NONE) {
2261 *value_ptr = op.value().f;
2262 }
2263 } else {
2264 // Support for ordinary threads
2265 VM_GetOrSetLocal op(java_thread, depth, slot, T_FLOAT, self);
2266 VMThread::execute(&op);
2267 err = op.result();
2268 if (err == JVMTI_ERROR_NONE) {
2269 *value_ptr = op.value().f;
2270 }
2271 }
2272 return err;
2273 } /* end GetLocalFloat */
2274
2275
2276 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
2277 // depth - pre-checked as non-negative
2278 // value_ptr - pre-checked for null
2279 jvmtiError
2280 JvmtiEnv::GetLocalDouble(jthread thread, jint depth, jint slot, jdouble* value_ptr) {
2281 JavaThread* current_thread = JavaThread::current();
2282 // rm object is created to clean up the javaVFrame created in
2283 // doit_prologue(), but after doit() is finished with it.
2284 ResourceMark rm(current_thread);
2285 HandleMark hm(current_thread);
2286 JvmtiVTMSTransitionDisabler disabler(thread);
2287 ThreadsListHandle tlh(current_thread);
2288
2289 JavaThread* java_thread = nullptr;
2290 oop thread_obj = nullptr;
2291 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, current_thread, &java_thread, &thread_obj);
2292 if (err != JVMTI_ERROR_NONE) {
2293 return err;
2294 }
2295 bool self = is_JavaThread_current(java_thread, thread_obj);
2296
2297 if (java_lang_VirtualThread::is_instance(thread_obj)) {
2298 VM_VirtualThreadGetOrSetLocal op(this, Handle(current_thread, thread_obj),
2299 depth, slot, T_DOUBLE, self);
2300 VMThread::execute(&op);
2301 err = op.result();
2302 if (err == JVMTI_ERROR_NONE) {
2303 *value_ptr = op.value().d;
2304 }
2305 } else {
2306 // Support for ordinary threads
2307 VM_GetOrSetLocal op(java_thread, depth, slot, T_DOUBLE, self);
2308 VMThread::execute(&op);
2309 err = op.result();
2310 if (err == JVMTI_ERROR_NONE) {
2311 *value_ptr = op.value().d;
2312 }
2313 }
2314 return err;
2315 } /* end GetLocalDouble */
2316
2317
2318 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
2319 // depth - pre-checked as non-negative
2320 jvmtiError
2321 JvmtiEnv::SetLocalObject(jthread thread, jint depth, jint slot, jobject value) {
2322 JavaThread* current_thread = JavaThread::current();
2323 // rm object is created to clean up the javaVFrame created in
2324 // doit_prologue(), but after doit() is finished with it.
2325 ResourceMark rm(current_thread);
2326 HandleMark hm(current_thread);
2327 JvmtiVTMSTransitionDisabler disabler(thread);
2328 ThreadsListHandle tlh(current_thread);
2329
2330 JavaThread* java_thread = nullptr;
2331 oop thread_obj = nullptr;
2332 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, current_thread, &java_thread, &thread_obj);
2333 if (err != JVMTI_ERROR_NONE) {
2334 return err;
2335 }
2336 bool self = is_JavaThread_current(java_thread, thread_obj);
2337 jvalue val;
2338 val.l = value;
2339
2340 if (java_lang_VirtualThread::is_instance(thread_obj)) {
2341 VM_VirtualThreadGetOrSetLocal op(this, Handle(current_thread, thread_obj),
2342 depth, slot, T_OBJECT, val, self);
2343 VMThread::execute(&op);
2344 err = op.result();
2345 } else {
2346 // Support for ordinary threads
2347 VM_GetOrSetLocal op(java_thread, depth, slot, T_OBJECT, val, self);
2348 VMThread::execute(&op);
2349 err = op.result();
2350 }
2351 return err;
2352 } /* end SetLocalObject */
2353
2354
2355 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
2356 // depth - pre-checked as non-negative
2357 jvmtiError
2358 JvmtiEnv::SetLocalInt(jthread thread, jint depth, jint slot, jint value) {
2359 JavaThread* current_thread = JavaThread::current();
2360 // rm object is created to clean up the javaVFrame created in
2361 // doit_prologue(), but after doit() is finished with it.
2362 ResourceMark rm(current_thread);
2363 HandleMark hm(current_thread);
2364 JvmtiVTMSTransitionDisabler disabler(thread);
2365 ThreadsListHandle tlh(current_thread);
2366
2367 JavaThread* java_thread = nullptr;
2368 oop thread_obj = nullptr;
2369 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, current_thread, &java_thread, &thread_obj);
2370 if (err != JVMTI_ERROR_NONE) {
2371 return err;
2372 }
2373 bool self = is_JavaThread_current(java_thread, thread_obj);
2374 jvalue val;
2375 val.i = value;
2376
2377 if (java_lang_VirtualThread::is_instance(thread_obj)) {
2378 VM_VirtualThreadGetOrSetLocal op(this, Handle(current_thread, thread_obj),
2379 depth, slot, T_INT, val, self);
2380 VMThread::execute(&op);
2381 err = op.result();
2382 } else {
2383 // Support for ordinary threads
2384 VM_GetOrSetLocal op(java_thread, depth, slot, T_INT, val, self);
2385 VMThread::execute(&op);
2386 err = op.result();
2387 }
2388 return err;
2389 } /* end SetLocalInt */
2390
2391
2392 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
2393 // depth - pre-checked as non-negative
2394 jvmtiError
2395 JvmtiEnv::SetLocalLong(jthread thread, jint depth, jint slot, jlong value) {
2396 JavaThread* current_thread = JavaThread::current();
2397 // rm object is created to clean up the javaVFrame created in
2398 // doit_prologue(), but after doit() is finished with it.
2399 ResourceMark rm(current_thread);
2400 HandleMark hm(current_thread);
2401 JvmtiVTMSTransitionDisabler disabler(thread);
2402 ThreadsListHandle tlh(current_thread);
2403
2404 JavaThread* java_thread = nullptr;
2405 oop thread_obj = nullptr;
2406 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, current_thread, &java_thread, &thread_obj);
2407 if (err != JVMTI_ERROR_NONE) {
2408 return err;
2409 }
2410 bool self = is_JavaThread_current(java_thread, thread_obj);
2411 jvalue val;
2412 val.j = value;
2413
2414 if (java_lang_VirtualThread::is_instance(thread_obj)) {
2415 VM_VirtualThreadGetOrSetLocal op(this, Handle(current_thread, thread_obj),
2416 depth, slot, T_LONG, val, self);
2417 VMThread::execute(&op);
2418 err = op.result();
2419 } else {
2420 // Support for ordinary threads
2421 VM_GetOrSetLocal op(java_thread, depth, slot, T_LONG, val, self);
2422 VMThread::execute(&op);
2423 err = op.result();
2424 }
2425 return err;
2426 } /* end SetLocalLong */
2427
2428
2429 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
2430 // depth - pre-checked as non-negative
2431 jvmtiError
2432 JvmtiEnv::SetLocalFloat(jthread thread, jint depth, jint slot, jfloat value) {
2433 JavaThread* current_thread = JavaThread::current();
2434 // rm object is created to clean up the javaVFrame created in
2435 // doit_prologue(), but after doit() is finished with it.
2436 ResourceMark rm(current_thread);
2437 HandleMark hm(current_thread);
2438 JvmtiVTMSTransitionDisabler disabler(thread);
2439 ThreadsListHandle tlh(current_thread);
2440
2441 JavaThread* java_thread = nullptr;
2442 oop thread_obj = nullptr;
2443 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, current_thread, &java_thread, &thread_obj);
2444 if (err != JVMTI_ERROR_NONE) {
2445 return err;
2446 }
2447 bool self = is_JavaThread_current(java_thread, thread_obj);
2448 jvalue val;
2449 val.f = value;
2450
2451 if (java_lang_VirtualThread::is_instance(thread_obj)) {
2452 VM_VirtualThreadGetOrSetLocal op(this, Handle(current_thread, thread_obj),
2453 depth, slot, T_FLOAT, val, self);
2454 VMThread::execute(&op);
2455 err = op.result();
2456 } else {
2457 // Support for ordinary threads
2458 VM_GetOrSetLocal op(java_thread, depth, slot, T_FLOAT, val, self);
2459 VMThread::execute(&op);
2460 err = op.result();
2461 }
2462 return err;
2463 } /* end SetLocalFloat */
2464
2465
2466 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
2467 // depth - pre-checked as non-negative
2468 jvmtiError
2469 JvmtiEnv::SetLocalDouble(jthread thread, jint depth, jint slot, jdouble value) {
2470 JavaThread* current_thread = JavaThread::current();
2471 // rm object is created to clean up the javaVFrame created in
2472 // doit_prologue(), but after doit() is finished with it.
2473 ResourceMark rm(current_thread);
2474 HandleMark hm(current_thread);
2475 JvmtiVTMSTransitionDisabler disabler(thread);
2476 ThreadsListHandle tlh(current_thread);
2477
2478 JavaThread* java_thread = nullptr;
2479 oop thread_obj = nullptr;
2480 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, current_thread, &java_thread, &thread_obj);
2481 if (err != JVMTI_ERROR_NONE) {
2482 return err;
2483 }
2484 bool self = is_JavaThread_current(java_thread, thread_obj);
2485 jvalue val;
2486 val.d = value;
2487
2488 if (java_lang_VirtualThread::is_instance(thread_obj)) {
2489 VM_VirtualThreadGetOrSetLocal op(this, Handle(current_thread, thread_obj),
2490 depth, slot, T_DOUBLE, val, self);
2491 VMThread::execute(&op);
2492 err = op.result();
2493 } else {
2494 // Support for ordinary threads
2495 VM_GetOrSetLocal op(java_thread, depth, slot, T_DOUBLE, val, self);
2496 VMThread::execute(&op);
2497 err = op.result();
2498 }
2499 return err;
2500 } /* end SetLocalDouble */
2501
2502
2503 //
2504 // Breakpoint functions
2505 //
2506
2507 // method - pre-checked for validity, but may be null meaning obsolete method
2508 jvmtiError
2509 JvmtiEnv::SetBreakpoint(Method* method, jlocation location) {
2510 NULL_CHECK(method, JVMTI_ERROR_INVALID_METHODID);
2511 if (location < 0) { // simple invalid location check first
2512 return JVMTI_ERROR_INVALID_LOCATION;
2513 }
2514 // verify that the breakpoint is not past the end of the method
2515 if (location >= (jlocation) method->code_size()) {
2516 return JVMTI_ERROR_INVALID_LOCATION;
2517 }
2518
2519 ResourceMark rm;
2520 JvmtiBreakpoint bp(method, location);
2521 JvmtiBreakpoints& jvmti_breakpoints = JvmtiCurrentBreakpoints::get_jvmti_breakpoints();
2522 if (jvmti_breakpoints.set(bp) == JVMTI_ERROR_DUPLICATE)
2523 return JVMTI_ERROR_DUPLICATE;
2524
2525 if (TraceJVMTICalls) {
2526 jvmti_breakpoints.print();
2527 }
2528
2529 return JVMTI_ERROR_NONE;
2530 } /* end SetBreakpoint */
2531
2532
2533 // method - pre-checked for validity, but may be null meaning obsolete method
2534 jvmtiError
2535 JvmtiEnv::ClearBreakpoint(Method* method, jlocation location) {
2536 NULL_CHECK(method, JVMTI_ERROR_INVALID_METHODID);
2537
2538 if (location < 0) { // simple invalid location check first
2539 return JVMTI_ERROR_INVALID_LOCATION;
2540 }
2541
2542 // verify that the breakpoint is not past the end of the method
2543 if (location >= (jlocation) method->code_size()) {
2544 return JVMTI_ERROR_INVALID_LOCATION;
2545 }
2546
2547 JvmtiBreakpoint bp(method, location);
2548
2549 JvmtiBreakpoints& jvmti_breakpoints = JvmtiCurrentBreakpoints::get_jvmti_breakpoints();
2550 if (jvmti_breakpoints.clear(bp) == JVMTI_ERROR_NOT_FOUND)
2551 return JVMTI_ERROR_NOT_FOUND;
2552
2553 if (TraceJVMTICalls) {
2554 jvmti_breakpoints.print();
2555 }
2556
2557 return JVMTI_ERROR_NONE;
2558 } /* end ClearBreakpoint */
2559
2560
2561 //
2562 // Watched Field functions
2563 //
2564
2565 jvmtiError
2566 JvmtiEnv::SetFieldAccessWatch(fieldDescriptor* fdesc_ptr) {
2567 JvmtiVTMSTransitionDisabler disabler;
2568 // make sure we haven't set this watch before
2569 if (fdesc_ptr->is_field_access_watched()) return JVMTI_ERROR_DUPLICATE;
2570 fdesc_ptr->set_is_field_access_watched(true);
2571
2572 JvmtiEventController::change_field_watch(JVMTI_EVENT_FIELD_ACCESS, true);
2573
2574 return JVMTI_ERROR_NONE;
2575 } /* end SetFieldAccessWatch */
2576
2577
2578 jvmtiError
2579 JvmtiEnv::ClearFieldAccessWatch(fieldDescriptor* fdesc_ptr) {
2580 JvmtiVTMSTransitionDisabler disabler;
2581 // make sure we have a watch to clear
2582 if (!fdesc_ptr->is_field_access_watched()) return JVMTI_ERROR_NOT_FOUND;
2583 fdesc_ptr->set_is_field_access_watched(false);
2584
2585 JvmtiEventController::change_field_watch(JVMTI_EVENT_FIELD_ACCESS, false);
2586
2587 return JVMTI_ERROR_NONE;
2588 } /* end ClearFieldAccessWatch */
2589
2590
2591 jvmtiError
2592 JvmtiEnv::SetFieldModificationWatch(fieldDescriptor* fdesc_ptr) {
2593 JvmtiVTMSTransitionDisabler disabler;
2594 // make sure we haven't set this watch before
2595 if (fdesc_ptr->is_field_modification_watched()) return JVMTI_ERROR_DUPLICATE;
2596 fdesc_ptr->set_is_field_modification_watched(true);
2597
2598 JvmtiEventController::change_field_watch(JVMTI_EVENT_FIELD_MODIFICATION, true);
2599
2600 return JVMTI_ERROR_NONE;
2601 } /* end SetFieldModificationWatch */
2602
2603
2604 jvmtiError
2605 JvmtiEnv::ClearFieldModificationWatch(fieldDescriptor* fdesc_ptr) {
2606 JvmtiVTMSTransitionDisabler disabler;
2607 // make sure we have a watch to clear
2608 if (!fdesc_ptr->is_field_modification_watched()) return JVMTI_ERROR_NOT_FOUND;
2609 fdesc_ptr->set_is_field_modification_watched(false);
2610
2611 JvmtiEventController::change_field_watch(JVMTI_EVENT_FIELD_MODIFICATION, false);
2612
2613 return JVMTI_ERROR_NONE;
2614 } /* end ClearFieldModificationWatch */
2615
2616 //
2617 // Class functions
2618 //
2619
2620
2621 // k_mirror - may be primitive, this must be checked
2622 // signature_ptr - null is a valid value, must be checked
2623 // generic_ptr - null is a valid value, must be checked
2624 jvmtiError
2625 JvmtiEnv::GetClassSignature(oop k_mirror, char** signature_ptr, char** generic_ptr) {
2626 ResourceMark rm;
2627 bool isPrimitive = java_lang_Class::is_primitive(k_mirror);
2628 Klass* k = nullptr;
2629 if (!isPrimitive) {
2630 k = java_lang_Class::as_Klass(k_mirror);
2631 NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS);
2632 }
2633 if (signature_ptr != nullptr) {
2634 char* result = nullptr;
2635 if (isPrimitive) {
2636 char tchar = type2char(java_lang_Class::primitive_type(k_mirror));
2637 result = (char*) jvmtiMalloc(2);
2638 result[0] = tchar;
2639 result[1] = '\0';
2640 } else {
2641 const char* class_sig = k->signature_name();
2642 result = (char *) jvmtiMalloc(strlen(class_sig)+1);
2643 strcpy(result, class_sig);
2644 }
2645 *signature_ptr = result;
2646 }
2647 if (generic_ptr != nullptr) {
2648 *generic_ptr = nullptr;
2649 if (!isPrimitive && k->is_instance_klass()) {
2650 Symbol* soo = InstanceKlass::cast(k)->generic_signature();
2651 if (soo != nullptr) {
2652 const char *gen_sig = soo->as_C_string();
2653 if (gen_sig != nullptr) {
2654 char* gen_result;
2655 jvmtiError err = allocate(strlen(gen_sig) + 1,
2656 (unsigned char **)&gen_result);
2657 if (err != JVMTI_ERROR_NONE) {
2658 return err;
2659 }
2660 strcpy(gen_result, gen_sig);
2661 *generic_ptr = gen_result;
2662 }
2663 }
2664 }
2665 }
2666 return JVMTI_ERROR_NONE;
2667 } /* end GetClassSignature */
2668
2669
2670 // k_mirror - may be primitive, this must be checked
2671 // status_ptr - pre-checked for null
2672 jvmtiError
2673 JvmtiEnv::GetClassStatus(oop k_mirror, jint* status_ptr) {
2674 jint result = 0;
2675 if (java_lang_Class::is_primitive(k_mirror)) {
2676 result |= JVMTI_CLASS_STATUS_PRIMITIVE;
2677 } else {
2678 Klass* k = java_lang_Class::as_Klass(k_mirror);
2679 NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS);
2680 result = k->jvmti_class_status();
2681 }
2682 *status_ptr = result;
2683
2684 return JVMTI_ERROR_NONE;
2685 } /* end GetClassStatus */
2686
2687
2688 // k_mirror - may be primitive, this must be checked
2689 // source_name_ptr - pre-checked for null
2690 jvmtiError
2691 JvmtiEnv::GetSourceFileName(oop k_mirror, char** source_name_ptr) {
2692 if (java_lang_Class::is_primitive(k_mirror)) {
2693 return JVMTI_ERROR_ABSENT_INFORMATION;
2694 }
2695 Klass* k_klass = java_lang_Class::as_Klass(k_mirror);
2696 NULL_CHECK(k_klass, JVMTI_ERROR_INVALID_CLASS);
2697
2698 if (!k_klass->is_instance_klass()) {
2699 return JVMTI_ERROR_ABSENT_INFORMATION;
2700 }
2701
2702 Symbol* sfnOop = InstanceKlass::cast(k_klass)->source_file_name();
2703 NULL_CHECK(sfnOop, JVMTI_ERROR_ABSENT_INFORMATION);
2704 {
2705 JavaThread* current_thread = JavaThread::current();
2706 ResourceMark rm(current_thread);
2707 const char* sfncp = (const char*) sfnOop->as_C_string();
2708 *source_name_ptr = (char *) jvmtiMalloc(strlen(sfncp)+1);
2709 strcpy(*source_name_ptr, sfncp);
2710 }
2711
2712 return JVMTI_ERROR_NONE;
2713 } /* end GetSourceFileName */
2714
2715
2716 // k_mirror - may be primitive, this must be checked
2717 // modifiers_ptr - pre-checked for null
2718 jvmtiError
2719 JvmtiEnv::GetClassModifiers(oop k_mirror, jint* modifiers_ptr) {
2720 jint result = java_lang_Class::modifiers(k_mirror);
2721 if (!java_lang_Class::is_primitive(k_mirror)) {
2722 // Reset the deleted ACC_SUPER bit (deleted in compute_modifier_flags()).
2723 result |= JVM_ACC_SUPER;
2724 }
2725 *modifiers_ptr = result;
2726
2727 return JVMTI_ERROR_NONE;
2728 } /* end GetClassModifiers */
2729
2730
2731 // k_mirror - may be primitive, this must be checked
2732 // method_count_ptr - pre-checked for null
2733 // methods_ptr - pre-checked for null
2734 jvmtiError
2735 JvmtiEnv::GetClassMethods(oop k_mirror, jint* method_count_ptr, jmethodID** methods_ptr) {
2736 JavaThread* current_thread = JavaThread::current();
2737 HandleMark hm(current_thread);
2738
2739 if (java_lang_Class::is_primitive(k_mirror)) {
2740 *method_count_ptr = 0;
2741 *methods_ptr = (jmethodID*) jvmtiMalloc(0 * sizeof(jmethodID));
2742 return JVMTI_ERROR_NONE;
2743 }
2744 Klass* k = java_lang_Class::as_Klass(k_mirror);
2745 NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS);
2746
2747 // Return CLASS_NOT_PREPARED error as per JVMTI spec.
2748 if (!(k->jvmti_class_status() & (JVMTI_CLASS_STATUS_PREPARED|JVMTI_CLASS_STATUS_ARRAY) )) {
2749 return JVMTI_ERROR_CLASS_NOT_PREPARED;
2750 }
2751
2752 if (!k->is_instance_klass()) {
2753 *method_count_ptr = 0;
2754 *methods_ptr = (jmethodID*) jvmtiMalloc(0 * sizeof(jmethodID));
2755 return JVMTI_ERROR_NONE;
2756 }
2757 InstanceKlass* ik = InstanceKlass::cast(k);
2758 // Allocate the result and fill it in
2759 int result_length = ik->methods()->length();
2760 jmethodID* result_list = (jmethodID*)jvmtiMalloc(result_length * sizeof(jmethodID));
2761 int index;
2762 bool jmethodids_found = true;
2763 int skipped = 0; // skip overpass methods
2764
2765 for (index = 0; index < result_length; index++) {
2766 Method* m = ik->methods()->at(index);
2767 // Depending on can_maintain_original_method_order capability use the original
2768 // method ordering indices stored in the class, so we can emit jmethodIDs in
2769 // the order they appeared in the class file or just copy in current order.
2770 int result_index = JvmtiExport::can_maintain_original_method_order() ? ik->method_ordering()->at(index) : index;
2771 assert(result_index >= 0 && result_index < result_length, "invalid original method index");
2772 if (m->is_overpass()) {
2773 result_list[result_index] = nullptr;
2774 skipped++;
2775 continue;
2776 }
2777 jmethodID id;
2778 if (jmethodids_found) {
2779 id = m->find_jmethod_id_or_null();
2780 if (id == nullptr) {
2781 // If we find an uninitialized value, make sure there is
2782 // enough space for all the uninitialized values we might
2783 // find.
2784 ik->ensure_space_for_methodids(index);
2785 jmethodids_found = false;
2786 id = m->jmethod_id();
2787 }
2788 } else {
2789 id = m->jmethod_id();
2790 }
2791 result_list[result_index] = id;
2792 }
2793
2794 // Fill in return value.
2795 if (skipped > 0) {
2796 // copy results skipping null methodIDs
2797 *methods_ptr = (jmethodID*)jvmtiMalloc((result_length - skipped) * sizeof(jmethodID));
2798 *method_count_ptr = result_length - skipped;
2799 for (index = 0, skipped = 0; index < result_length; index++) {
2800 if (result_list[index] == nullptr) {
2801 skipped++;
2802 } else {
2803 (*methods_ptr)[index - skipped] = result_list[index];
2804 }
2805 }
2806 deallocate((unsigned char *)result_list);
2807 } else {
2808 *method_count_ptr = result_length;
2809 *methods_ptr = result_list;
2810 }
2811
2812 return JVMTI_ERROR_NONE;
2813 } /* end GetClassMethods */
2814
2815
2816 // k_mirror - may be primitive, this must be checked
2817 // field_count_ptr - pre-checked for null
2818 // fields_ptr - pre-checked for null
2819 jvmtiError
2820 JvmtiEnv::GetClassFields(oop k_mirror, jint* field_count_ptr, jfieldID** fields_ptr) {
2821 if (java_lang_Class::is_primitive(k_mirror)) {
2822 *field_count_ptr = 0;
2823 *fields_ptr = (jfieldID*) jvmtiMalloc(0 * sizeof(jfieldID));
2824 return JVMTI_ERROR_NONE;
2825 }
2826 JavaThread* current_thread = JavaThread::current();
2827 HandleMark hm(current_thread);
2828 Klass* k = java_lang_Class::as_Klass(k_mirror);
2829 NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS);
2830
2831 // Return CLASS_NOT_PREPARED error as per JVMTI spec.
2832 if (!(k->jvmti_class_status() & (JVMTI_CLASS_STATUS_PREPARED|JVMTI_CLASS_STATUS_ARRAY) )) {
2833 return JVMTI_ERROR_CLASS_NOT_PREPARED;
2834 }
2835
2836 if (!k->is_instance_klass()) {
2837 *field_count_ptr = 0;
2838 *fields_ptr = (jfieldID*) jvmtiMalloc(0 * sizeof(jfieldID));
2839 return JVMTI_ERROR_NONE;
2840 }
2841
2842 InstanceKlass* ik = InstanceKlass::cast(k);
2843
2844 FilteredJavaFieldStream flds(ik);
2845
2846 int result_count = flds.field_count();
2847
2848 // Allocate the result and fill it in.
2849 jfieldID* result_list = (jfieldID*)jvmtiMalloc(result_count * sizeof(jfieldID));
2850 for (int i = 0; i < result_count; i++, flds.next()) {
2851 result_list[i] = jfieldIDWorkaround::to_jfieldID(ik, flds.offset(),
2852 flds.access_flags().is_static());
2853 }
2854 assert(flds.done(), "just checking");
2855
2856 // Fill in the results
2857 *field_count_ptr = result_count;
2858 *fields_ptr = result_list;
2859
2860 return JVMTI_ERROR_NONE;
2861 } /* end GetClassFields */
2862
2863
2864 // k_mirror - may be primitive, this must be checked
2865 // interface_count_ptr - pre-checked for null
2866 // interfaces_ptr - pre-checked for null
2867 jvmtiError
2868 JvmtiEnv::GetImplementedInterfaces(oop k_mirror, jint* interface_count_ptr, jclass** interfaces_ptr) {
2869 {
2870 if (java_lang_Class::is_primitive(k_mirror)) {
2871 *interface_count_ptr = 0;
2872 *interfaces_ptr = (jclass*) jvmtiMalloc(0 * sizeof(jclass));
2873 return JVMTI_ERROR_NONE;
2874 }
2875 JavaThread* current_thread = JavaThread::current();
2876 HandleMark hm(current_thread);
2877 Klass* k = java_lang_Class::as_Klass(k_mirror);
2878 NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS);
2879
2880 // Return CLASS_NOT_PREPARED error as per JVMTI spec.
2881 if (!(k->jvmti_class_status() & (JVMTI_CLASS_STATUS_PREPARED|JVMTI_CLASS_STATUS_ARRAY) ))
2882 return JVMTI_ERROR_CLASS_NOT_PREPARED;
2883
2884 if (!k->is_instance_klass()) {
2885 *interface_count_ptr = 0;
2886 *interfaces_ptr = (jclass*) jvmtiMalloc(0 * sizeof(jclass));
2887 return JVMTI_ERROR_NONE;
2888 }
2889
2890 Array<InstanceKlass*>* interface_list = InstanceKlass::cast(k)->local_interfaces();
2891 const int result_length = (interface_list == nullptr ? 0 : interface_list->length());
2892 jclass* result_list = (jclass*) jvmtiMalloc(result_length * sizeof(jclass));
2893 for (int i_index = 0; i_index < result_length; i_index += 1) {
2894 InstanceKlass* klass_at = interface_list->at(i_index);
2895 assert(klass_at->is_klass(), "interfaces must be Klass*s");
2896 assert(klass_at->is_interface(), "interfaces must be interfaces");
2897 oop mirror_at = klass_at->java_mirror();
2898 Handle handle_at = Handle(current_thread, mirror_at);
2899 result_list[i_index] = (jclass) jni_reference(handle_at);
2900 }
2901 *interface_count_ptr = result_length;
2902 *interfaces_ptr = result_list;
2903 }
2904
2905 return JVMTI_ERROR_NONE;
2906 } /* end GetImplementedInterfaces */
2907
2908
2909 // k_mirror - may be primitive, this must be checked
2910 // minor_version_ptr - pre-checked for null
2911 // major_version_ptr - pre-checked for null
2912 jvmtiError
2913 JvmtiEnv::GetClassVersionNumbers(oop k_mirror, jint* minor_version_ptr, jint* major_version_ptr) {
2914 if (java_lang_Class::is_primitive(k_mirror)) {
2915 return JVMTI_ERROR_ABSENT_INFORMATION;
2916 }
2917 Klass* klass = java_lang_Class::as_Klass(k_mirror);
2918
2919 jint status = klass->jvmti_class_status();
2920 if (status & (JVMTI_CLASS_STATUS_ERROR)) {
2921 return JVMTI_ERROR_INVALID_CLASS;
2922 }
2923 if (status & (JVMTI_CLASS_STATUS_ARRAY)) {
2924 return JVMTI_ERROR_ABSENT_INFORMATION;
2925 }
2926
2927 InstanceKlass* ik = InstanceKlass::cast(klass);
2928 *minor_version_ptr = ik->minor_version();
2929 *major_version_ptr = ik->major_version();
2930
2931 return JVMTI_ERROR_NONE;
2932 } /* end GetClassVersionNumbers */
2933
2934
2935 // k_mirror - may be primitive, this must be checked
2936 // constant_pool_count_ptr - pre-checked for null
2937 // constant_pool_byte_count_ptr - pre-checked for null
2938 // constant_pool_bytes_ptr - pre-checked for null
2939 jvmtiError
2940 JvmtiEnv::GetConstantPool(oop k_mirror, jint* constant_pool_count_ptr, jint* constant_pool_byte_count_ptr, unsigned char** constant_pool_bytes_ptr) {
2941 if (java_lang_Class::is_primitive(k_mirror)) {
2942 return JVMTI_ERROR_ABSENT_INFORMATION;
2943 }
2944
2945 Klass* klass = java_lang_Class::as_Klass(k_mirror);
2946 Thread *thread = Thread::current();
2947 ResourceMark rm(thread);
2948
2949 jint status = klass->jvmti_class_status();
2950 if (status & (JVMTI_CLASS_STATUS_ERROR)) {
2951 return JVMTI_ERROR_INVALID_CLASS;
2952 }
2953 if (status & (JVMTI_CLASS_STATUS_ARRAY)) {
2954 return JVMTI_ERROR_ABSENT_INFORMATION;
2955 }
2956
2957 InstanceKlass* ik = InstanceKlass::cast(klass);
2958 JvmtiConstantPoolReconstituter reconstituter(ik);
2959 if (reconstituter.get_error() != JVMTI_ERROR_NONE) {
2960 return reconstituter.get_error();
2961 }
2962
2963 unsigned char *cpool_bytes;
2964 int cpool_size = reconstituter.cpool_size();
2965 if (reconstituter.get_error() != JVMTI_ERROR_NONE) {
2966 return reconstituter.get_error();
2967 }
2968 jvmtiError res = allocate(cpool_size, &cpool_bytes);
2969 if (res != JVMTI_ERROR_NONE) {
2970 return res;
2971 }
2972 reconstituter.copy_cpool_bytes(cpool_bytes);
2973 if (reconstituter.get_error() != JVMTI_ERROR_NONE) {
2974 return reconstituter.get_error();
2975 }
2976
2977 constantPoolHandle constants(thread, ik->constants());
2978 *constant_pool_count_ptr = constants->length();
2979 *constant_pool_byte_count_ptr = cpool_size;
2980 *constant_pool_bytes_ptr = cpool_bytes;
2981
2982 return JVMTI_ERROR_NONE;
2983 } /* end GetConstantPool */
2984
2985
2986 // k_mirror - may be primitive, this must be checked
2987 // is_interface_ptr - pre-checked for null
2988 jvmtiError
2989 JvmtiEnv::IsInterface(oop k_mirror, jboolean* is_interface_ptr) {
2990 {
2991 bool result = false;
2992 if (!java_lang_Class::is_primitive(k_mirror)) {
2993 Klass* k = java_lang_Class::as_Klass(k_mirror);
2994 if (k != nullptr && k->is_interface()) {
2995 result = true;
2996 }
2997 }
2998 *is_interface_ptr = result;
2999 }
3000
3001 return JVMTI_ERROR_NONE;
3002 } /* end IsInterface */
3003
3004
3005 // k_mirror - may be primitive, this must be checked
3006 // is_array_class_ptr - pre-checked for null
3007 jvmtiError
3008 JvmtiEnv::IsArrayClass(oop k_mirror, jboolean* is_array_class_ptr) {
3009 {
3010 bool result = false;
3011 if (!java_lang_Class::is_primitive(k_mirror)) {
3012 Klass* k = java_lang_Class::as_Klass(k_mirror);
3013 if (k != nullptr && k->is_array_klass()) {
3014 result = true;
3015 }
3016 }
3017 *is_array_class_ptr = result;
3018 }
3019
3020 return JVMTI_ERROR_NONE;
3021 } /* end IsArrayClass */
3022
3023
3024 // k_mirror - may be primitive, this must be checked
3025 // classloader_ptr - pre-checked for null
3026 jvmtiError
3027 JvmtiEnv::GetClassLoader(oop k_mirror, jobject* classloader_ptr) {
3028 {
3029 if (java_lang_Class::is_primitive(k_mirror)) {
3030 *classloader_ptr = (jclass) jni_reference(Handle());
3031 return JVMTI_ERROR_NONE;
3032 }
3033 JavaThread* current_thread = JavaThread::current();
3034 HandleMark hm(current_thread);
3035 Klass* k = java_lang_Class::as_Klass(k_mirror);
3036 NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS);
3037
3038 oop result_oop = k->class_loader();
3039 if (result_oop == nullptr) {
3040 *classloader_ptr = (jclass) jni_reference(Handle());
3041 return JVMTI_ERROR_NONE;
3042 }
3043 Handle result_handle = Handle(current_thread, result_oop);
3044 jclass result_jnihandle = (jclass) jni_reference(result_handle);
3045 *classloader_ptr = result_jnihandle;
3046 }
3047 return JVMTI_ERROR_NONE;
3048 } /* end GetClassLoader */
3049
3050
3051 // k_mirror - may be primitive, this must be checked
3052 // source_debug_extension_ptr - pre-checked for null
3053 jvmtiError
3054 JvmtiEnv::GetSourceDebugExtension(oop k_mirror, char** source_debug_extension_ptr) {
3055 {
3056 if (java_lang_Class::is_primitive(k_mirror)) {
3057 return JVMTI_ERROR_ABSENT_INFORMATION;
3058 }
3059 Klass* k = java_lang_Class::as_Klass(k_mirror);
3060 NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS);
3061 if (!k->is_instance_klass()) {
3062 return JVMTI_ERROR_ABSENT_INFORMATION;
3063 }
3064 const char* sde = InstanceKlass::cast(k)->source_debug_extension();
3065 NULL_CHECK(sde, JVMTI_ERROR_ABSENT_INFORMATION);
3066
3067 {
3068 *source_debug_extension_ptr = (char *) jvmtiMalloc(strlen(sde)+1);
3069 strcpy(*source_debug_extension_ptr, sde);
3070 }
3071 }
3072
3073 return JVMTI_ERROR_NONE;
3074 } /* end GetSourceDebugExtension */
3075
3076 //
3077 // Object functions
3078 //
3079
3080 // hash_code_ptr - pre-checked for null
3081 jvmtiError
3082 JvmtiEnv::GetObjectHashCode(jobject object, jint* hash_code_ptr) {
3083 oop mirror = JNIHandles::resolve_external_guard(object);
3084 NULL_CHECK(mirror, JVMTI_ERROR_INVALID_OBJECT);
3085 NULL_CHECK(hash_code_ptr, JVMTI_ERROR_NULL_POINTER);
3086
3087 {
3088 jint result = (jint) mirror->identity_hash();
3089 *hash_code_ptr = result;
3090 }
3091 return JVMTI_ERROR_NONE;
3092 } /* end GetObjectHashCode */
3093
3094
3095 // info_ptr - pre-checked for null
3096 jvmtiError
3097 JvmtiEnv::GetObjectMonitorUsage(jobject object, jvmtiMonitorUsage* info_ptr) {
3098 // This needs to be performed at a safepoint to gather stable data
3099 // because monitor owner / waiters might not be suspended.
3100 VM_GetObjectMonitorUsage op(this, JavaThread::current(), object, info_ptr);
3101 VMThread::execute(&op);
3102 return op.result();
3103 } /* end GetObjectMonitorUsage */
3104
3105
3106 //
3107 // Field functions
3108 //
3109
3110 // name_ptr - null is a valid value, must be checked
3111 // signature_ptr - null is a valid value, must be checked
3112 // generic_ptr - null is a valid value, must be checked
3113 jvmtiError
3114 JvmtiEnv::GetFieldName(fieldDescriptor* fdesc_ptr, char** name_ptr, char** signature_ptr, char** generic_ptr) {
3115 JavaThread* current_thread = JavaThread::current();
3116 ResourceMark rm(current_thread);
3117 if (name_ptr == nullptr) {
3118 // just don't return the name
3119 } else {
3120 const char* fieldName = fdesc_ptr->name()->as_C_string();
3121 *name_ptr = (char*) jvmtiMalloc(strlen(fieldName) + 1);
3122 if (*name_ptr == nullptr)
3123 return JVMTI_ERROR_OUT_OF_MEMORY;
3124 strcpy(*name_ptr, fieldName);
3125 }
3126 if (signature_ptr== nullptr) {
3127 // just don't return the signature
3128 } else {
3129 const char* fieldSignature = fdesc_ptr->signature()->as_C_string();
3130 *signature_ptr = (char*) jvmtiMalloc(strlen(fieldSignature) + 1);
3131 if (*signature_ptr == nullptr)
3132 return JVMTI_ERROR_OUT_OF_MEMORY;
3133 strcpy(*signature_ptr, fieldSignature);
3134 }
3135 if (generic_ptr != nullptr) {
3136 *generic_ptr = nullptr;
3137 Symbol* soop = fdesc_ptr->generic_signature();
3138 if (soop != nullptr) {
3139 const char* gen_sig = soop->as_C_string();
3140 if (gen_sig != nullptr) {
3141 jvmtiError err = allocate(strlen(gen_sig) + 1, (unsigned char **)generic_ptr);
3142 if (err != JVMTI_ERROR_NONE) {
3143 return err;
3144 }
3145 strcpy(*generic_ptr, gen_sig);
3146 }
3147 }
3148 }
3149 return JVMTI_ERROR_NONE;
3150 } /* end GetFieldName */
3151
3152
3153 // declaring_class_ptr - pre-checked for null
3154 jvmtiError
3155 JvmtiEnv::GetFieldDeclaringClass(fieldDescriptor* fdesc_ptr, jclass* declaring_class_ptr) {
3156 // As for the GetFieldDeclaringClass method, the XSL generated C++ code that calls it has
3157 // a jclass of the relevant class or a subclass of it, which is fine in terms of ensuring
3158 // the holder is kept alive.
3159 *declaring_class_ptr = get_jni_class_non_null(fdesc_ptr->field_holder());
3160 return JVMTI_ERROR_NONE;
3161 } /* end GetFieldDeclaringClass */
3162
3163
3164 // modifiers_ptr - pre-checked for null
3165 jvmtiError
3166 JvmtiEnv::GetFieldModifiers(fieldDescriptor* fdesc_ptr, jint* modifiers_ptr) {
3167
3168 AccessFlags resultFlags = fdesc_ptr->access_flags();
3169 jint result = resultFlags.as_field_flags();
3170 *modifiers_ptr = result;
3171
3172 return JVMTI_ERROR_NONE;
3173 } /* end GetFieldModifiers */
3174
3175
3176 // is_synthetic_ptr - pre-checked for null
3177 jvmtiError
3178 JvmtiEnv::IsFieldSynthetic(fieldDescriptor* fdesc_ptr, jboolean* is_synthetic_ptr) {
3179 *is_synthetic_ptr = fdesc_ptr->is_synthetic();
3180 return JVMTI_ERROR_NONE;
3181 } /* end IsFieldSynthetic */
3182
3183
3184 //
3185 // Method functions
3186 //
3187
3188 // method - pre-checked for validity, but may be null meaning obsolete method
3189 // name_ptr - null is a valid value, must be checked
3190 // signature_ptr - null is a valid value, must be checked
3191 // generic_ptr - null is a valid value, must be checked
3192 jvmtiError
3193 JvmtiEnv::GetMethodName(Method* method, char** name_ptr, char** signature_ptr, char** generic_ptr) {
3194 NULL_CHECK(method, JVMTI_ERROR_INVALID_METHODID);
3195 JavaThread* current_thread = JavaThread::current();
3196
3197 ResourceMark rm(current_thread); // get the utf8 name and signature
3198 if (name_ptr == nullptr) {
3199 // just don't return the name
3200 } else {
3201 const char* utf8_name = (const char *) method->name()->as_utf8();
3202 *name_ptr = (char *) jvmtiMalloc(strlen(utf8_name)+1);
3203 strcpy(*name_ptr, utf8_name);
3204 }
3205 if (signature_ptr == nullptr) {
3206 // just don't return the signature
3207 } else {
3208 const char* utf8_signature = (const char *) method->signature()->as_utf8();
3209 *signature_ptr = (char *) jvmtiMalloc(strlen(utf8_signature) + 1);
3210 strcpy(*signature_ptr, utf8_signature);
3211 }
3212
3213 if (generic_ptr != nullptr) {
3214 *generic_ptr = nullptr;
3215 Symbol* soop = method->generic_signature();
3216 if (soop != nullptr) {
3217 const char* gen_sig = soop->as_C_string();
3218 if (gen_sig != nullptr) {
3219 jvmtiError err = allocate(strlen(gen_sig) + 1, (unsigned char **)generic_ptr);
3220 if (err != JVMTI_ERROR_NONE) {
3221 return err;
3222 }
3223 strcpy(*generic_ptr, gen_sig);
3224 }
3225 }
3226 }
3227 return JVMTI_ERROR_NONE;
3228 } /* end GetMethodName */
3229
3230
3231 // method - pre-checked for validity, but may be null meaning obsolete method
3232 // declaring_class_ptr - pre-checked for null
3233 jvmtiError
3234 JvmtiEnv::GetMethodDeclaringClass(Method* method, jclass* declaring_class_ptr) {
3235 NULL_CHECK(method, JVMTI_ERROR_INVALID_METHODID);
3236 Klass* k = method->method_holder();
3237 Handle holder(Thread::current(), k->klass_holder()); // keep the klass alive
3238 (*declaring_class_ptr) = get_jni_class_non_null(k);
3239 return JVMTI_ERROR_NONE;
3240 } /* end GetMethodDeclaringClass */
3241
3242
3243 // method - pre-checked for validity, but may be null meaning obsolete method
3244 // modifiers_ptr - pre-checked for null
3245 jvmtiError
3246 JvmtiEnv::GetMethodModifiers(Method* method, jint* modifiers_ptr) {
3247 NULL_CHECK(method, JVMTI_ERROR_INVALID_METHODID);
3248 (*modifiers_ptr) = method->access_flags().as_method_flags();
3249 return JVMTI_ERROR_NONE;
3250 } /* end GetMethodModifiers */
3251
3252
3253 // method - pre-checked for validity, but may be null meaning obsolete method
3254 // max_ptr - pre-checked for null
3255 jvmtiError
3256 JvmtiEnv::GetMaxLocals(Method* method, jint* max_ptr) {
3257 NULL_CHECK(method, JVMTI_ERROR_INVALID_METHODID);
3258 // get max stack
3259 (*max_ptr) = method->max_locals();
3260 return JVMTI_ERROR_NONE;
3261 } /* end GetMaxLocals */
3262
3263
3264 // method - pre-checked for validity, but may be null meaning obsolete method
3265 // size_ptr - pre-checked for null
3266 jvmtiError
3267 JvmtiEnv::GetArgumentsSize(Method* method, jint* size_ptr) {
3268 NULL_CHECK(method, JVMTI_ERROR_INVALID_METHODID);
3269 // get size of arguments
3270
3271 (*size_ptr) = method->size_of_parameters();
3272 return JVMTI_ERROR_NONE;
3273 } /* end GetArgumentsSize */
3274
3275
3276 // method - pre-checked for validity, but may be null meaning obsolete method
3277 // entry_count_ptr - pre-checked for null
3278 // table_ptr - pre-checked for null
3279 jvmtiError
3280 JvmtiEnv::GetLineNumberTable(Method* method, jint* entry_count_ptr, jvmtiLineNumberEntry** table_ptr) {
3281 NULL_CHECK(method, JVMTI_ERROR_INVALID_METHODID);
3282 if (!method->has_linenumber_table()) {
3283 return (JVMTI_ERROR_ABSENT_INFORMATION);
3284 }
3285
3286 // The line number table is compressed so we don't know how big it is until decompressed.
3287 // Decompression is really fast so we just do it twice.
3288
3289 // Compute size of table
3290 jint num_entries = 0;
3291 CompressedLineNumberReadStream stream(method->compressed_linenumber_table());
3292 while (stream.read_pair()) {
3293 num_entries++;
3294 }
3295 jvmtiLineNumberEntry *jvmti_table =
3296 (jvmtiLineNumberEntry *)jvmtiMalloc(num_entries * (sizeof(jvmtiLineNumberEntry)));
3297
3298 // Fill jvmti table
3299 if (num_entries > 0) {
3300 int index = 0;
3301 CompressedLineNumberReadStream stream(method->compressed_linenumber_table());
3302 while (stream.read_pair()) {
3303 jvmti_table[index].start_location = (jlocation) stream.bci();
3304 jvmti_table[index].line_number = (jint) stream.line();
3305 index++;
3306 }
3307 assert(index == num_entries, "sanity check");
3308 }
3309
3310 // Set up results
3311 (*entry_count_ptr) = num_entries;
3312 (*table_ptr) = jvmti_table;
3313
3314 return JVMTI_ERROR_NONE;
3315 } /* end GetLineNumberTable */
3316
3317
3318 // method - pre-checked for validity, but may be null meaning obsolete method
3319 // start_location_ptr - pre-checked for null
3320 // end_location_ptr - pre-checked for null
3321 jvmtiError
3322 JvmtiEnv::GetMethodLocation(Method* method, jlocation* start_location_ptr, jlocation* end_location_ptr) {
3323
3324 NULL_CHECK(method, JVMTI_ERROR_INVALID_METHODID);
3325 // get start and end location
3326 (*end_location_ptr) = (jlocation) (method->code_size() - 1);
3327 if (method->code_size() == 0) {
3328 // there is no code so there is no start location
3329 (*start_location_ptr) = (jlocation)(-1);
3330 } else {
3331 (*start_location_ptr) = (jlocation)(0);
3332 }
3333
3334 return JVMTI_ERROR_NONE;
3335 } /* end GetMethodLocation */
3336
3337
3338 // method - pre-checked for validity, but may be null meaning obsolete method
3339 // entry_count_ptr - pre-checked for null
3340 // table_ptr - pre-checked for null
3341 jvmtiError
3342 JvmtiEnv::GetLocalVariableTable(Method* method, jint* entry_count_ptr, jvmtiLocalVariableEntry** table_ptr) {
3343
3344 NULL_CHECK(method, JVMTI_ERROR_INVALID_METHODID);
3345 JavaThread* current_thread = JavaThread::current();
3346
3347 // does the klass have any local variable information?
3348 InstanceKlass* ik = method->method_holder();
3349 if (!ik->has_localvariable_table()) {
3350 return (JVMTI_ERROR_ABSENT_INFORMATION);
3351 }
3352
3353 ConstantPool* constants = method->constants();
3354 NULL_CHECK(constants, JVMTI_ERROR_ABSENT_INFORMATION);
3355
3356 // in the vm localvariable table representation, 6 consecutive elements in the table
3357 // represent a 6-tuple of shorts
3358 // [start_pc, length, name_index, descriptor_index, signature_index, index]
3359 jint num_entries = method->localvariable_table_length();
3360 jvmtiLocalVariableEntry *jvmti_table = (jvmtiLocalVariableEntry *)
3361 jvmtiMalloc(num_entries * (sizeof(jvmtiLocalVariableEntry)));
3362
3363 if (num_entries > 0) {
3364 LocalVariableTableElement* table = method->localvariable_table_start();
3365 for (int i = 0; i < num_entries; i++) {
3366 // get the 5 tuple information from the vm table
3367 jlocation start_location = (jlocation) table[i].start_bci;
3368 jint length = (jint) table[i].length;
3369 int name_index = (int) table[i].name_cp_index;
3370 int signature_index = (int) table[i].descriptor_cp_index;
3371 int generic_signature_index = (int) table[i].signature_cp_index;
3372 jint slot = (jint) table[i].slot;
3373
3374 // get utf8 name and signature
3375 char *name_buf = nullptr;
3376 char *sig_buf = nullptr;
3377 char *gen_sig_buf = nullptr;
3378 {
3379 ResourceMark rm(current_thread);
3380
3381 const char *utf8_name = (const char *) constants->symbol_at(name_index)->as_utf8();
3382 name_buf = (char *) jvmtiMalloc(strlen(utf8_name)+1);
3383 strcpy(name_buf, utf8_name);
3384
3385 const char *utf8_signature = (const char *) constants->symbol_at(signature_index)->as_utf8();
3386 sig_buf = (char *) jvmtiMalloc(strlen(utf8_signature)+1);
3387 strcpy(sig_buf, utf8_signature);
3388
3389 if (generic_signature_index > 0) {
3390 const char *utf8_gen_sign = (const char *)
3391 constants->symbol_at(generic_signature_index)->as_utf8();
3392 gen_sig_buf = (char *) jvmtiMalloc(strlen(utf8_gen_sign)+1);
3393 strcpy(gen_sig_buf, utf8_gen_sign);
3394 }
3395 }
3396
3397 // fill in the jvmti local variable table
3398 jvmti_table[i].start_location = start_location;
3399 jvmti_table[i].length = length;
3400 jvmti_table[i].name = name_buf;
3401 jvmti_table[i].signature = sig_buf;
3402 jvmti_table[i].generic_signature = gen_sig_buf;
3403 jvmti_table[i].slot = slot;
3404 }
3405 }
3406
3407 // set results
3408 (*entry_count_ptr) = num_entries;
3409 (*table_ptr) = jvmti_table;
3410
3411 return JVMTI_ERROR_NONE;
3412 } /* end GetLocalVariableTable */
3413
3414
3415 // method - pre-checked for validity, but may be null meaning obsolete method
3416 // bytecode_count_ptr - pre-checked for null
3417 // bytecodes_ptr - pre-checked for null
3418 jvmtiError
3419 JvmtiEnv::GetBytecodes(Method* method, jint* bytecode_count_ptr, unsigned char** bytecodes_ptr) {
3420 NULL_CHECK(method, JVMTI_ERROR_INVALID_METHODID);
3421
3422 methodHandle mh(Thread::current(), method);
3423 jint size = (jint)mh->code_size();
3424 jvmtiError err = allocate(size, bytecodes_ptr);
3425 if (err != JVMTI_ERROR_NONE) {
3426 return err;
3427 }
3428
3429 (*bytecode_count_ptr) = size;
3430 // get byte codes
3431 JvmtiClassFileReconstituter::copy_bytecodes(mh, *bytecodes_ptr);
3432
3433 return JVMTI_ERROR_NONE;
3434 } /* end GetBytecodes */
3435
3436
3437 // method - pre-checked for validity, but may be null meaning obsolete method
3438 // is_native_ptr - pre-checked for null
3439 jvmtiError
3440 JvmtiEnv::IsMethodNative(Method* method, jboolean* is_native_ptr) {
3441 NULL_CHECK(method, JVMTI_ERROR_INVALID_METHODID);
3442 (*is_native_ptr) = method->is_native();
3443 return JVMTI_ERROR_NONE;
3444 } /* end IsMethodNative */
3445
3446
3447 // method - pre-checked for validity, but may be null meaning obsolete method
3448 // is_synthetic_ptr - pre-checked for null
3449 jvmtiError
3450 JvmtiEnv::IsMethodSynthetic(Method* method, jboolean* is_synthetic_ptr) {
3451 NULL_CHECK(method, JVMTI_ERROR_INVALID_METHODID);
3452 (*is_synthetic_ptr) = method->is_synthetic();
3453 return JVMTI_ERROR_NONE;
3454 } /* end IsMethodSynthetic */
3455
3456
3457 // method - pre-checked for validity, but may be null meaning obsolete method
3458 // is_obsolete_ptr - pre-checked for null
3459 jvmtiError
3460 JvmtiEnv::IsMethodObsolete(Method* method, jboolean* is_obsolete_ptr) {
3461 if (use_version_1_0_semantics() &&
3462 get_capabilities()->can_redefine_classes == 0) {
3463 // This JvmtiEnv requested version 1.0 semantics and this function
3464 // requires the can_redefine_classes capability in version 1.0 so
3465 // we need to return an error here.
3466 return JVMTI_ERROR_MUST_POSSESS_CAPABILITY;
3467 }
3468
3469 if (method == nullptr || method->is_obsolete()) {
3470 *is_obsolete_ptr = true;
3471 } else {
3472 *is_obsolete_ptr = false;
3473 }
3474 return JVMTI_ERROR_NONE;
3475 } /* end IsMethodObsolete */
3476
3477 //
3478 // Raw Monitor functions
3479 //
3480
3481 // name - pre-checked for null
3482 // monitor_ptr - pre-checked for null
3483 jvmtiError
3484 JvmtiEnv::CreateRawMonitor(const char* name, jrawMonitorID* monitor_ptr) {
3485 JvmtiRawMonitor* rmonitor = new (std::nothrow) JvmtiRawMonitor(name);
3486 NULL_CHECK(rmonitor, JVMTI_ERROR_OUT_OF_MEMORY);
3487
3488 *monitor_ptr = (jrawMonitorID)rmonitor;
3489
3490 return JVMTI_ERROR_NONE;
3491 } /* end CreateRawMonitor */
3492
3493
3494 // rmonitor - pre-checked for validity
3495 jvmtiError
3496 JvmtiEnv::DestroyRawMonitor(JvmtiRawMonitor * rmonitor) {
3497 if (Threads::number_of_threads() == 0) {
3498 // Remove this monitor from pending raw monitors list
3499 // if it has entered in onload or start phase.
3500 JvmtiPendingMonitors::destroy(rmonitor);
3501 } else {
3502 Thread* thread = Thread::current();
3503 if (rmonitor->owner() == thread) {
3504 // The caller owns this monitor which we are about to destroy.
3505 // We exit the underlying synchronization object so that the
3506 // "delete monitor" call below can work without an assertion
3507 // failure on systems that don't like destroying synchronization
3508 // objects that are locked.
3509 int r;
3510 int recursion = rmonitor->recursions();
3511 for (int i = 0; i <= recursion; i++) {
3512 r = rmonitor->raw_exit(thread);
3513 assert(r == JvmtiRawMonitor::M_OK, "raw_exit should have worked");
3514 if (r != JvmtiRawMonitor::M_OK) { // robustness
3515 return JVMTI_ERROR_INTERNAL;
3516 }
3517 }
3518 }
3519 if (rmonitor->owner() != nullptr) {
3520 // The caller is trying to destroy a monitor that is locked by
3521 // someone else. While this is not forbidden by the JVMTI
3522 // spec, it will cause an assertion failure on systems that don't
3523 // like destroying synchronization objects that are locked.
3524 // We indicate a problem with the error return (and leak the
3525 // monitor's memory).
3526 return JVMTI_ERROR_NOT_MONITOR_OWNER;
3527 }
3528 }
3529
3530 delete rmonitor;
3531
3532 return JVMTI_ERROR_NONE;
3533 } /* end DestroyRawMonitor */
3534
3535
3536 // rmonitor - pre-checked for validity
3537 jvmtiError
3538 JvmtiEnv::RawMonitorEnter(JvmtiRawMonitor * rmonitor) {
3539 if (Threads::number_of_threads() == 0) {
3540 // No JavaThreads exist so JvmtiRawMonitor enter cannot be
3541 // used, add this raw monitor to the pending list.
3542 // The pending monitors will be actually entered when
3543 // the VM is setup.
3544 // See transition_pending_raw_monitors in create_vm()
3545 // in thread.cpp.
3546 JvmtiPendingMonitors::enter(rmonitor);
3547 } else {
3548 Thread* thread = Thread::current();
3549 // 8266889: raw_enter changes Java thread state, needs WXWrite
3550 MACOS_AARCH64_ONLY(ThreadWXEnable __wx(WXWrite, thread));
3551 rmonitor->raw_enter(thread);
3552 }
3553 return JVMTI_ERROR_NONE;
3554 } /* end RawMonitorEnter */
3555
3556
3557 // rmonitor - pre-checked for validity
3558 jvmtiError
3559 JvmtiEnv::RawMonitorExit(JvmtiRawMonitor * rmonitor) {
3560 jvmtiError err = JVMTI_ERROR_NONE;
3561
3562 if (Threads::number_of_threads() == 0) {
3563 // No JavaThreads exist so just remove this monitor from the pending list.
3564 // Bool value from exit is false if rmonitor is not in the list.
3565 if (!JvmtiPendingMonitors::exit(rmonitor)) {
3566 err = JVMTI_ERROR_NOT_MONITOR_OWNER;
3567 }
3568 } else {
3569 Thread* thread = Thread::current();
3570 int r = rmonitor->raw_exit(thread);
3571 if (r == JvmtiRawMonitor::M_ILLEGAL_MONITOR_STATE) {
3572 err = JVMTI_ERROR_NOT_MONITOR_OWNER;
3573 }
3574 }
3575 return err;
3576 } /* end RawMonitorExit */
3577
3578
3579 // rmonitor - pre-checked for validity
3580 jvmtiError
3581 JvmtiEnv::RawMonitorWait(JvmtiRawMonitor * rmonitor, jlong millis) {
3582 Thread* thread = Thread::current();
3583 // 8266889: raw_wait changes Java thread state, needs WXWrite
3584 MACOS_AARCH64_ONLY(ThreadWXEnable __wx(WXWrite, thread));
3585 int r = rmonitor->raw_wait(millis, thread);
3586
3587 switch (r) {
3588 case JvmtiRawMonitor::M_INTERRUPTED:
3589 return JVMTI_ERROR_INTERRUPT;
3590 case JvmtiRawMonitor::M_ILLEGAL_MONITOR_STATE:
3591 return JVMTI_ERROR_NOT_MONITOR_OWNER;
3592 default:
3593 return JVMTI_ERROR_NONE;
3594 }
3595 } /* end RawMonitorWait */
3596
3597
3598 // rmonitor - pre-checked for validity
3599 jvmtiError
3600 JvmtiEnv::RawMonitorNotify(JvmtiRawMonitor * rmonitor) {
3601 Thread* thread = Thread::current();
3602 int r = rmonitor->raw_notify(thread);
3603
3604 if (r == JvmtiRawMonitor::M_ILLEGAL_MONITOR_STATE) {
3605 return JVMTI_ERROR_NOT_MONITOR_OWNER;
3606 }
3607 return JVMTI_ERROR_NONE;
3608 } /* end RawMonitorNotify */
3609
3610
3611 // rmonitor - pre-checked for validity
3612 jvmtiError
3613 JvmtiEnv::RawMonitorNotifyAll(JvmtiRawMonitor * rmonitor) {
3614 Thread* thread = Thread::current();
3615 int r = rmonitor->raw_notifyAll(thread);
3616
3617 if (r == JvmtiRawMonitor::M_ILLEGAL_MONITOR_STATE) {
3618 return JVMTI_ERROR_NOT_MONITOR_OWNER;
3619 }
3620 return JVMTI_ERROR_NONE;
3621 } /* end RawMonitorNotifyAll */
3622
3623
3624 //
3625 // JNI Function Interception functions
3626 //
3627
3628
3629 // function_table - pre-checked for null
3630 jvmtiError
3631 JvmtiEnv::SetJNIFunctionTable(const jniNativeInterface* function_table) {
3632 // Copy jni function table at safepoint.
3633 VM_JNIFunctionTableCopier copier(function_table);
3634 VMThread::execute(&copier);
3635
3636 return JVMTI_ERROR_NONE;
3637 } /* end SetJNIFunctionTable */
3638
3639
3640 // function_table - pre-checked for null
3641 jvmtiError
3642 JvmtiEnv::GetJNIFunctionTable(jniNativeInterface** function_table) {
3643 *function_table=(jniNativeInterface*)jvmtiMalloc(sizeof(jniNativeInterface));
3644 if (*function_table == nullptr)
3645 return JVMTI_ERROR_OUT_OF_MEMORY;
3646 memcpy(*function_table,(JavaThread::current())->get_jni_functions(),sizeof(jniNativeInterface));
3647 return JVMTI_ERROR_NONE;
3648 } /* end GetJNIFunctionTable */
3649
3650
3651 //
3652 // Event Management functions
3653 //
3654
3655 jvmtiError
3656 JvmtiEnv::GenerateEvents(jvmtiEvent event_type) {
3657 // can only generate two event types
3658 if (event_type != JVMTI_EVENT_COMPILED_METHOD_LOAD &&
3659 event_type != JVMTI_EVENT_DYNAMIC_CODE_GENERATED) {
3660 return JVMTI_ERROR_ILLEGAL_ARGUMENT;
3661 }
3662
3663 // for compiled_method_load events we must check that the environment
3664 // has the can_generate_compiled_method_load_events capability.
3665 if (event_type == JVMTI_EVENT_COMPILED_METHOD_LOAD) {
3666 if (get_capabilities()->can_generate_compiled_method_load_events == 0) {
3667 return JVMTI_ERROR_MUST_POSSESS_CAPABILITY;
3668 }
3669 return JvmtiCodeBlobEvents::generate_compiled_method_load_events(this);
3670 } else {
3671 return JvmtiCodeBlobEvents::generate_dynamic_code_events(this);
3672 }
3673
3674 } /* end GenerateEvents */
3675
3676
3677 //
3678 // Extension Mechanism functions
3679 //
3680
3681 // extension_count_ptr - pre-checked for null
3682 // extensions - pre-checked for null
3683 jvmtiError
3684 JvmtiEnv::GetExtensionFunctions(jint* extension_count_ptr, jvmtiExtensionFunctionInfo** extensions) {
3685 return JvmtiExtensions::get_functions(this, extension_count_ptr, extensions);
3686 } /* end GetExtensionFunctions */
3687
3688
3689 // extension_count_ptr - pre-checked for null
3690 // extensions - pre-checked for null
3691 jvmtiError
3692 JvmtiEnv::GetExtensionEvents(jint* extension_count_ptr, jvmtiExtensionEventInfo** extensions) {
3693 return JvmtiExtensions::get_events(this, extension_count_ptr, extensions);
3694 } /* end GetExtensionEvents */
3695
3696
3697 // callback - null is a valid value, must be checked
3698 jvmtiError
3699 JvmtiEnv::SetExtensionEventCallback(jint extension_event_index, jvmtiExtensionEvent callback) {
3700 return JvmtiExtensions::set_event_callback(this, extension_event_index, callback);
3701 } /* end SetExtensionEventCallback */
3702
3703 //
3704 // Timers functions
3705 //
3706
3707 // info_ptr - pre-checked for null
3708 jvmtiError
3709 JvmtiEnv::GetCurrentThreadCpuTimerInfo(jvmtiTimerInfo* info_ptr) {
3710 os::current_thread_cpu_time_info(info_ptr);
3711 return JVMTI_ERROR_NONE;
3712 } /* end GetCurrentThreadCpuTimerInfo */
3713
3714
3715 // nanos_ptr - pre-checked for null
3716 jvmtiError
3717 JvmtiEnv::GetCurrentThreadCpuTime(jlong* nanos_ptr) {
3718 Thread* thread = Thread::current();
3719
3720 // Surprisingly the GetCurrentThreadCpuTime is used by non-JavaThread's.
3721 if (thread->is_Java_thread()) {
3722 if (JavaThread::cast(thread)->is_vthread_mounted()) {
3723 // No support for a VirtualThread (yet).
3724 return JVMTI_ERROR_UNSUPPORTED_OPERATION;
3725 }
3726 }
3727 *nanos_ptr = os::current_thread_cpu_time();
3728 return JVMTI_ERROR_NONE;
3729 } /* end GetCurrentThreadCpuTime */
3730
3731
3732 // info_ptr - pre-checked for null
3733 jvmtiError
3734 JvmtiEnv::GetThreadCpuTimerInfo(jvmtiTimerInfo* info_ptr) {
3735 os::thread_cpu_time_info(info_ptr);
3736 return JVMTI_ERROR_NONE;
3737 } /* end GetThreadCpuTimerInfo */
3738
3739
3740 // nanos_ptr - pre-checked for null
3741 jvmtiError
3742 JvmtiEnv::GetThreadCpuTime(jthread thread, jlong* nanos_ptr) {
3743 JavaThread* current_thread = JavaThread::current();
3744 ThreadsListHandle tlh(current_thread);
3745 JavaThread* java_thread = nullptr;
3746 oop thread_oop = nullptr;
3747
3748 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, current_thread, &java_thread, &thread_oop);
3749
3750 if (thread_oop != nullptr && thread_oop->is_a(vmClasses::BaseVirtualThread_klass())) {
3751 // No support for virtual threads (yet).
3752 return JVMTI_ERROR_UNSUPPORTED_OPERATION;
3753 }
3754 if (err != JVMTI_ERROR_NONE) {
3755 return err;
3756 }
3757 NULL_CHECK(nanos_ptr, JVMTI_ERROR_NULL_POINTER);
3758
3759 *nanos_ptr = os::thread_cpu_time(java_thread);
3760 return JVMTI_ERROR_NONE;
3761 } /* end GetThreadCpuTime */
3762
3763
3764 // info_ptr - pre-checked for null
3765 jvmtiError
3766 JvmtiEnv::GetTimerInfo(jvmtiTimerInfo* info_ptr) {
3767 os::javaTimeNanos_info(info_ptr);
3768 return JVMTI_ERROR_NONE;
3769 } /* end GetTimerInfo */
3770
3771
3772 // nanos_ptr - pre-checked for null
3773 jvmtiError
3774 JvmtiEnv::GetTime(jlong* nanos_ptr) {
3775 *nanos_ptr = os::javaTimeNanos();
3776 return JVMTI_ERROR_NONE;
3777 } /* end GetTime */
3778
3779
3780 // processor_count_ptr - pre-checked for null
3781 jvmtiError
3782 JvmtiEnv::GetAvailableProcessors(jint* processor_count_ptr) {
3783 *processor_count_ptr = os::active_processor_count();
3784 return JVMTI_ERROR_NONE;
3785 } /* end GetAvailableProcessors */
3786
3787 jvmtiError
3788 JvmtiEnv::SetHeapSamplingInterval(jint sampling_interval) {
3789 if (sampling_interval < 0) {
3790 return JVMTI_ERROR_ILLEGAL_ARGUMENT;
3791 }
3792 ThreadHeapSampler::set_sampling_interval(sampling_interval);
3793 return JVMTI_ERROR_NONE;
3794 } /* end SetHeapSamplingInterval */
3795
3796 //
3797 // System Properties functions
3798 //
3799
3800 // count_ptr - pre-checked for null
3801 // property_ptr - pre-checked for null
3802 jvmtiError
3803 JvmtiEnv::GetSystemProperties(jint* count_ptr, char*** property_ptr) {
3804 jvmtiError err = JVMTI_ERROR_NONE;
3805
3806 // Get the number of readable properties.
3807 *count_ptr = Arguments::PropertyList_readable_count(Arguments::system_properties());
3808
3809 // Allocate memory to hold the exact number of readable properties.
3810 err = allocate(*count_ptr * sizeof(char *), (unsigned char **)property_ptr);
3811 if (err != JVMTI_ERROR_NONE) {
3812 return err;
3813 }
3814 int readable_count = 0;
3815 // Loop through the system properties until all the readable properties are found.
3816 for (SystemProperty* p = Arguments::system_properties(); p != nullptr && readable_count < *count_ptr; p = p->next()) {
3817 if (p->readable()) {
3818 const char *key = p->key();
3819 char **tmp_value = *property_ptr+readable_count;
3820 readable_count++;
3821 err = allocate((strlen(key)+1) * sizeof(char), (unsigned char**)tmp_value);
3822 if (err == JVMTI_ERROR_NONE) {
3823 strcpy(*tmp_value, key);
3824 } else {
3825 // clean up previously allocated memory.
3826 for (int j = 0; j < readable_count; j++) {
3827 Deallocate((unsigned char*)*property_ptr+j);
3828 }
3829 Deallocate((unsigned char*)property_ptr);
3830 break;
3831 }
3832 }
3833 }
3834 assert(err != JVMTI_ERROR_NONE || readable_count == *count_ptr, "Bad readable property count");
3835 return err;
3836 } /* end GetSystemProperties */
3837
3838
3839 // property - pre-checked for null
3840 // value_ptr - pre-checked for null
3841 jvmtiError
3842 JvmtiEnv::GetSystemProperty(const char* property, char** value_ptr) {
3843 jvmtiError err = JVMTI_ERROR_NONE;
3844 const char *value;
3845
3846 // Return JVMTI_ERROR_NOT_AVAILABLE if property is not readable or doesn't exist.
3847 value = Arguments::PropertyList_get_readable_value(Arguments::system_properties(), property);
3848 if (value == nullptr) {
3849 err = JVMTI_ERROR_NOT_AVAILABLE;
3850 } else {
3851 err = allocate((strlen(value)+1) * sizeof(char), (unsigned char **)value_ptr);
3852 if (err == JVMTI_ERROR_NONE) {
3853 strcpy(*value_ptr, value);
3854 }
3855 }
3856 return err;
3857 } /* end GetSystemProperty */
3858
3859
3860 // property - pre-checked for null
3861 // value - null is a valid value, must be checked
3862 jvmtiError
3863 JvmtiEnv::SetSystemProperty(const char* property, const char* value_ptr) {
3864 for (SystemProperty* p = Arguments::system_properties(); p != nullptr; p = p->next()) {
3865 if (strcmp(property, p->key()) == 0) {
3866 if (p->writeable()) {
3867 if (p->set_value(value_ptr, AllocFailStrategy::RETURN_NULL)) {
3868 return JVMTI_ERROR_NONE;
3869 } else {
3870 return JVMTI_ERROR_OUT_OF_MEMORY;
3871 }
3872 } else {
3873 // We found a property, but it's not writeable
3874 return JVMTI_ERROR_NOT_AVAILABLE;
3875 }
3876 }
3877 }
3878
3879 // We cannot find a property of the given name
3880 return JVMTI_ERROR_NOT_AVAILABLE;
3881 } /* end SetSystemProperty */