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 if (java_lang_VirtualThread::is_instance(thread_oop)) {
992 oop carrier_thread = java_lang_VirtualThread::carrier_thread(thread_oop);
993 java_thread = carrier_thread == nullptr ? nullptr : java_lang_Thread::thread(carrier_thread);
994 }
995 results[i] = suspend_thread(thread_oop, java_thread, /* single_suspend */ true);
996 }
997 }
998 // Self suspend after all other suspends if necessary.
999 // Do not use JvmtiVTMSTransitionDisabler in context of self suspend to avoid deadlocks.
1000 if (self_tobj() != nullptr) {
1001 // there should not be any error for current java_thread
1002 results[self_idx] = suspend_thread(self_tobj(), current, /* single_suspend */ true);
1003 }
1004 // per-thread suspend results returned via results parameter
1005 return JVMTI_ERROR_NONE;
1006 } /* end SuspendThreadList */
1007
1008
1009 jvmtiError
1010 JvmtiEnv::SuspendAllVirtualThreads(jint except_count, const jthread* except_list) {
1011 if (get_capabilities()->can_support_virtual_threads == 0) {
1012 return JVMTI_ERROR_MUST_POSSESS_CAPABILITY;
1013 }
1014 JavaThread* current = JavaThread::current();
1015 HandleMark hm(current);
1016 Handle self_tobj;
1017
1018 {
1019 ResourceMark rm(current);
1020 JvmtiVTMSTransitionDisabler disabler(true);
1021 ThreadsListHandle tlh(current);
1022 GrowableArray<jthread>* elist = new GrowableArray<jthread>(except_count);
1023
1024 jvmtiError err = JvmtiEnvBase::check_thread_list(except_count, except_list);
1025 if (err != JVMTI_ERROR_NONE) {
1026 return err;
1027 }
1028
1029 // Collect threads from except_list for which resumed status must be restored (only for VirtualThread case)
1030 for (int idx = 0; idx < except_count; idx++) {
1031 jthread thread = except_list[idx];
1032 oop thread_oop = JNIHandles::resolve_external_guard(thread);
1033 if (java_lang_VirtualThread::is_instance(thread_oop) && !JvmtiVTSuspender::is_vthread_suspended(thread_oop)) {
1034 // is not suspended, so its resumed status must be restored
1035 elist->append(except_list[idx]);
1036 }
1037 }
1038
1039 for (JavaThreadIteratorWithHandle jtiwh; JavaThread *java_thread = jtiwh.next(); ) {
1040 oop vt_oop = java_thread->jvmti_vthread();
1041 if (!java_thread->is_exiting() &&
1042 !java_thread->is_jvmti_agent_thread() &&
1043 !java_thread->is_hidden_from_external_view() &&
1044 vt_oop != nullptr &&
1045 ((java_lang_VirtualThread::is_instance(vt_oop) &&
1046 JvmtiEnvBase::is_vthread_alive(vt_oop) &&
1047 !JvmtiVTSuspender::is_vthread_suspended(vt_oop)) ||
1048 (vt_oop->is_a(vmClasses::BoundVirtualThread_klass()) && !java_thread->is_suspended())) &&
1049 !is_in_thread_list(except_count, except_list, vt_oop)
1050 ) {
1051 if (java_thread == current) {
1052 self_tobj = Handle(current, vt_oop);
1053 continue; // self suspend after all other suspends
1054 }
1055 suspend_thread(vt_oop, java_thread, /* single_suspend */ false);
1056 }
1057 }
1058 JvmtiVTSuspender::register_all_vthreads_suspend();
1059
1060 // Restore resumed state for threads from except list that were not suspended before.
1061 for (int idx = 0; idx < elist->length(); idx++) {
1062 jthread thread = elist->at(idx);
1063 oop thread_oop = JNIHandles::resolve_external_guard(thread);
1064 if (JvmtiVTSuspender::is_vthread_suspended(thread_oop)) {
1065 JvmtiVTSuspender::register_vthread_resume(thread_oop);
1066 }
1067 }
1068 }
1069 // Self suspend after all other suspends if necessary.
1070 // Do not use JvmtiVTMSTransitionDisabler in context of self suspend to avoid deadlocks.
1071 if (self_tobj() != nullptr) {
1072 suspend_thread(self_tobj(), current, /* single_suspend */ false);
1073 }
1074 return JVMTI_ERROR_NONE;
1075 } /* end SuspendAllVirtualThreads */
1076
1077
1078 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
1079 jvmtiError
1080 JvmtiEnv::ResumeThread(jthread thread) {
1081 JvmtiVTMSTransitionDisabler disabler(true);
1082 JavaThread* current = JavaThread::current();
1083 ThreadsListHandle tlh(current);
1084
1085 JavaThread* java_thread = nullptr;
1086 oop thread_oop = nullptr;
1087 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, current, &java_thread, &thread_oop);
1088 if (err != JVMTI_ERROR_NONE) {
1089 return err;
1090 }
1091 err = resume_thread(thread_oop, java_thread, /* single_resume */ true);
1092 return err;
1093 } /* end ResumeThread */
1094
1095
1096 // request_count - pre-checked to be greater than or equal to 0
1097 // request_list - pre-checked for null
1098 // results - pre-checked for null
1099 jvmtiError
1100 JvmtiEnv::ResumeThreadList(jint request_count, const jthread* request_list, jvmtiError* results) {
1101 oop thread_oop = nullptr;
1102 JavaThread* java_thread = nullptr;
1103 JvmtiVTMSTransitionDisabler disabler(true);
1104 ThreadsListHandle tlh;
1105
1106 for (int i = 0; i < request_count; i++) {
1107 jthread thread = request_list[i];
1108 jvmtiError err = JvmtiExport::cv_external_thread_to_JavaThread(tlh.list(), thread, &java_thread, &thread_oop);
1109
1110 if (thread_oop != nullptr &&
1111 java_lang_VirtualThread::is_instance(thread_oop) &&
1112 !JvmtiEnvBase::is_vthread_alive(thread_oop)) {
1113 err = JVMTI_ERROR_THREAD_NOT_ALIVE;
1114 }
1115 if (err != JVMTI_ERROR_NONE) {
1116 if (thread_oop == nullptr || err != JVMTI_ERROR_INVALID_THREAD) {
1117 results[i] = err;
1118 continue;
1119 }
1120 }
1121 if (java_lang_VirtualThread::is_instance(thread_oop)) {
1122 oop carrier_thread = java_lang_VirtualThread::carrier_thread(thread_oop);
1123 java_thread = carrier_thread == nullptr ? nullptr : java_lang_Thread::thread(carrier_thread);
1124 }
1125 results[i] = resume_thread(thread_oop, java_thread, /* single_resume */ true);
1126 }
1127 // per-thread resume results returned via results parameter
1128 return JVMTI_ERROR_NONE;
1129 } /* end ResumeThreadList */
1130
1131
1132 jvmtiError
1133 JvmtiEnv::ResumeAllVirtualThreads(jint except_count, const jthread* except_list) {
1134 if (get_capabilities()->can_support_virtual_threads == 0) {
1135 return JVMTI_ERROR_MUST_POSSESS_CAPABILITY;
1136 }
1137 jvmtiError err = JvmtiEnvBase::check_thread_list(except_count, except_list);
1138 if (err != JVMTI_ERROR_NONE) {
1139 return err;
1140 }
1141 ResourceMark rm;
1142 JvmtiVTMSTransitionDisabler disabler(true);
1143 GrowableArray<jthread>* elist = new GrowableArray<jthread>(except_count);
1144
1145 // Collect threads from except_list for which suspended status must be restored (only for VirtualThread case)
1146 for (int idx = 0; idx < except_count; idx++) {
1147 jthread thread = except_list[idx];
1148 oop thread_oop = JNIHandles::resolve_external_guard(thread);
1149 if (java_lang_VirtualThread::is_instance(thread_oop) && JvmtiVTSuspender::is_vthread_suspended(thread_oop)) {
1150 // is suspended, so its suspended status must be restored
1151 elist->append(except_list[idx]);
1152 }
1153 }
1154
1155 for (JavaThreadIteratorWithHandle jtiwh; JavaThread *java_thread = jtiwh.next(); ) {
1156 oop vt_oop = java_thread->jvmti_vthread();
1157 if (!java_thread->is_exiting() &&
1158 !java_thread->is_jvmti_agent_thread() &&
1159 !java_thread->is_hidden_from_external_view() &&
1160 vt_oop != nullptr &&
1161 ((java_lang_VirtualThread::is_instance(vt_oop) &&
1162 JvmtiEnvBase::is_vthread_alive(vt_oop) &&
1163 JvmtiVTSuspender::is_vthread_suspended(vt_oop)) ||
1164 (vt_oop->is_a(vmClasses::BoundVirtualThread_klass()) && java_thread->is_suspended())) &&
1165 !is_in_thread_list(except_count, except_list, vt_oop)
1166 ) {
1167 resume_thread(vt_oop, java_thread, /* single_resume */ false);
1168 }
1169 }
1170 JvmtiVTSuspender::register_all_vthreads_resume();
1171
1172 // Restore suspended state for threads from except list that were suspended before.
1173 for (int idx = 0; idx < elist->length(); idx++) {
1174 jthread thread = elist->at(idx);
1175 oop thread_oop = JNIHandles::resolve_external_guard(thread);
1176 if (!JvmtiVTSuspender::is_vthread_suspended(thread_oop)) {
1177 JvmtiVTSuspender::register_vthread_suspend(thread_oop);
1178 }
1179 }
1180 return JVMTI_ERROR_NONE;
1181 } /* end ResumeAllVirtualThreads */
1182
1183
1184 jvmtiError
1185 JvmtiEnv::StopThread(jthread thread, jobject exception) {
1186 JavaThread* current_thread = JavaThread::current();
1187
1188 JvmtiVTMSTransitionDisabler disabler(thread);
1189 ThreadsListHandle tlh(current_thread);
1190 JavaThread* java_thread = nullptr;
1191 oop thread_oop = nullptr;
1192
1193 NULL_CHECK(thread, JVMTI_ERROR_INVALID_THREAD);
1194
1195 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, current_thread, &java_thread, &thread_oop);
1196
1197 bool is_virtual = thread_oop != nullptr && thread_oop->is_a(vmClasses::BaseVirtualThread_klass());
1198
1199 if (is_virtual && !is_JavaThread_current(java_thread, thread_oop)) {
1200 if (!is_vthread_suspended(thread_oop, java_thread)) {
1201 return JVMTI_ERROR_THREAD_NOT_SUSPENDED;
1202 }
1203 if (java_thread == nullptr) { // unmounted virtual thread
1204 return JVMTI_ERROR_OPAQUE_FRAME;
1205 }
1206 }
1207 if (err != JVMTI_ERROR_NONE) {
1208 return err;
1209 }
1210 oop e = JNIHandles::resolve_external_guard(exception);
1211 NULL_CHECK(e, JVMTI_ERROR_NULL_POINTER);
1212
1213 JavaThread::send_async_exception(java_thread, e);
1214
1215 return JVMTI_ERROR_NONE;
1216
1217 } /* end StopThread */
1218
1219
1220 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
1221 jvmtiError
1222 JvmtiEnv::InterruptThread(jthread thread) {
1223 JavaThread* current_thread = JavaThread::current();
1224 HandleMark hm(current_thread);
1225
1226 JvmtiVTMSTransitionDisabler disabler(thread);
1227 ThreadsListHandle tlh(current_thread);
1228
1229 JavaThread* java_thread = nullptr;
1230 oop thread_obj = nullptr;
1231 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, current_thread, &java_thread, &thread_obj);
1232 if (err != JVMTI_ERROR_NONE) {
1233 return err;
1234 }
1235
1236 if (java_lang_VirtualThread::is_instance(thread_obj)) {
1237 // For virtual threads we have to call into Java to interrupt:
1238 Handle obj(current_thread, thread_obj);
1239 JvmtiJavaUpcallMark jjum(current_thread); // hide JVMTI events for Java upcall
1240 JavaValue result(T_VOID);
1241 JavaCalls::call_virtual(&result,
1242 obj,
1243 vmClasses::Thread_klass(),
1244 vmSymbols::interrupt_method_name(),
1245 vmSymbols::void_method_signature(),
1246 current_thread);
1247
1248 return JVMTI_ERROR_NONE;
1249 }
1250
1251 // Really this should be a Java call to Thread.interrupt to ensure the same
1252 // semantics, however historically this has not been done for some reason.
1253 // So we continue with that (which means we don't interact with any Java-level
1254 // Interruptible object) but we must set the Java-level interrupted state.
1255 java_lang_Thread::set_interrupted(thread_obj, true);
1256 java_thread->interrupt();
1257
1258 return JVMTI_ERROR_NONE;
1259 } /* end InterruptThread */
1260
1261
1262 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
1263 // info_ptr - pre-checked for null
1264 jvmtiError
1265 JvmtiEnv::GetThreadInfo(jthread thread, jvmtiThreadInfo* info_ptr) {
1266 JavaThread* current_thread = JavaThread::current();
1267 ResourceMark rm(current_thread);
1268 HandleMark hm(current_thread);
1269 JavaThread* java_thread = nullptr;
1270 oop thread_oop = nullptr;
1271
1272 JvmtiVTMSTransitionDisabler disabler(thread);
1273 ThreadsListHandle tlh(current_thread);
1274
1275 // if thread is null the current thread is used
1276 if (thread == nullptr) {
1277 java_thread = JavaThread::current();
1278 thread_oop = get_vthread_or_thread_oop(java_thread);
1279 if (thread_oop == nullptr || !thread_oop->is_a(vmClasses::Thread_klass())) {
1280 return JVMTI_ERROR_INVALID_THREAD;
1281 }
1282 } else {
1283 jvmtiError err = JvmtiExport::cv_external_thread_to_JavaThread(tlh.list(), thread, &java_thread, &thread_oop);
1284 if (err != JVMTI_ERROR_NONE) {
1285 // We got an error code so we don't have a JavaThread *, but
1286 // only return an error from here if we didn't get a valid
1287 // thread_oop.
1288 // In the virtual thread case the cv_external_thread_to_JavaThread is expected to correctly set
1289 // the thread_oop and return JVMTI_ERROR_INVALID_THREAD which we ignore here.
1290 if (thread_oop == nullptr) {
1291 return err;
1292 }
1293 }
1294 }
1295 // We have a valid thread_oop so we can return some thread info.
1296
1297 Handle thread_obj(current_thread, thread_oop);
1298 Handle name;
1299 ThreadPriority priority;
1300 Handle thread_group;
1301 Handle context_class_loader;
1302 bool is_daemon;
1303
1304 name = Handle(current_thread, java_lang_Thread::name(thread_obj()));
1305
1306 if (java_lang_VirtualThread::is_instance(thread_obj())) {
1307 priority = (ThreadPriority)JVMTI_THREAD_NORM_PRIORITY;
1308 is_daemon = true;
1309 if (java_lang_VirtualThread::state(thread_obj()) == java_lang_VirtualThread::TERMINATED) {
1310 thread_group = Handle(current_thread, nullptr);
1311 } else {
1312 thread_group = Handle(current_thread, java_lang_Thread_Constants::get_VTHREAD_GROUP());
1313 }
1314 } else {
1315 priority = java_lang_Thread::priority(thread_obj());
1316 is_daemon = java_lang_Thread::is_daemon(thread_obj());
1317 if (java_lang_Thread::get_thread_status(thread_obj()) == JavaThreadStatus::TERMINATED) {
1318 thread_group = Handle(current_thread, nullptr);
1319 } else {
1320 thread_group = Handle(current_thread, java_lang_Thread::threadGroup(thread_obj()));
1321 }
1322 }
1323
1324 oop loader = java_lang_Thread::context_class_loader(thread_obj());
1325 context_class_loader = Handle(current_thread, loader);
1326
1327 { const char *n;
1328
1329 if (name() != nullptr) {
1330 n = java_lang_String::as_utf8_string(name());
1331 } else {
1332 size_t utf8_length = 0;
1333 n = UNICODE::as_utf8((jchar*) nullptr, utf8_length);
1334 }
1335
1336 info_ptr->name = (char *) jvmtiMalloc(strlen(n)+1);
1337 if (info_ptr->name == nullptr)
1338 return JVMTI_ERROR_OUT_OF_MEMORY;
1339
1340 strcpy(info_ptr->name, n);
1341 }
1342 info_ptr->is_daemon = is_daemon;
1343 info_ptr->priority = priority;
1344
1345 info_ptr->context_class_loader = (context_class_loader.is_null()) ? nullptr :
1346 jni_reference(context_class_loader);
1347 info_ptr->thread_group = jni_reference(thread_group);
1348
1349 return JVMTI_ERROR_NONE;
1350 } /* end GetThreadInfo */
1351
1352
1353 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
1354 // owned_monitor_count_ptr - pre-checked for null
1355 // owned_monitors_ptr - pre-checked for null
1356 jvmtiError
1357 JvmtiEnv::GetOwnedMonitorInfo(jthread thread, jint* owned_monitor_count_ptr, jobject** owned_monitors_ptr) {
1358 JavaThread* calling_thread = JavaThread::current();
1359 HandleMark hm(calling_thread);
1360
1361 JvmtiVTMSTransitionDisabler disabler(thread);
1362 ThreadsListHandle tlh(calling_thread);
1363
1364 JavaThread* java_thread = nullptr;
1365 oop thread_oop = nullptr;
1366 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, calling_thread, &java_thread, &thread_oop);
1367 if (err != JVMTI_ERROR_NONE) {
1368 return err;
1369 }
1370
1371 if (LockingMode == LM_LEGACY && java_thread == nullptr) {
1372 *owned_monitor_count_ptr = 0;
1373 return JVMTI_ERROR_NONE;
1374 }
1375
1376 // growable array of jvmti monitors info on the C-heap
1377 GrowableArray<jvmtiMonitorStackDepthInfo*> *owned_monitors_list =
1378 new (mtServiceability) GrowableArray<jvmtiMonitorStackDepthInfo*>(1, mtServiceability);
1379
1380 Handle thread_handle(calling_thread, thread_oop);
1381 EscapeBarrier eb(java_thread != nullptr, calling_thread, java_thread);
1382 if (!eb.deoptimize_objects(MaxJavaStackTraceDepth)) {
1383 delete owned_monitors_list;
1384 return JVMTI_ERROR_OUT_OF_MEMORY;
1385 }
1386 // get owned monitors info with handshake
1387 GetOwnedMonitorInfoClosure op(this, calling_thread, owned_monitors_list);
1388 JvmtiHandshake::execute(&op, &tlh, java_thread, thread_handle);
1389 err = op.result();
1390
1391 jint owned_monitor_count = owned_monitors_list->length();
1392 if (err == JVMTI_ERROR_NONE) {
1393 if ((err = allocate(owned_monitor_count * sizeof(jobject *),
1394 (unsigned char**)owned_monitors_ptr)) == JVMTI_ERROR_NONE) {
1395 // copy into the returned array
1396 for (int i = 0; i < owned_monitor_count; i++) {
1397 (*owned_monitors_ptr)[i] =
1398 ((jvmtiMonitorStackDepthInfo*)owned_monitors_list->at(i))->monitor;
1399 }
1400 *owned_monitor_count_ptr = owned_monitor_count;
1401 }
1402 }
1403 // clean up.
1404 for (int i = 0; i < owned_monitor_count; i++) {
1405 deallocate((unsigned char*)owned_monitors_list->at(i));
1406 }
1407 delete owned_monitors_list;
1408
1409 return err;
1410 } /* end GetOwnedMonitorInfo */
1411
1412
1413 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
1414 // monitor_info_count_ptr - pre-checked for null
1415 // monitor_info_ptr - pre-checked for null
1416 jvmtiError
1417 JvmtiEnv::GetOwnedMonitorStackDepthInfo(jthread thread, jint* monitor_info_count_ptr, jvmtiMonitorStackDepthInfo** monitor_info_ptr) {
1418 JavaThread* calling_thread = JavaThread::current();
1419 HandleMark hm(calling_thread);
1420
1421 JvmtiVTMSTransitionDisabler disabler(thread);
1422 ThreadsListHandle tlh(calling_thread);
1423
1424 JavaThread* java_thread = nullptr;
1425 oop thread_oop = nullptr;
1426 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, calling_thread, &java_thread, &thread_oop);
1427 if (err != JVMTI_ERROR_NONE) {
1428 return err;
1429 }
1430
1431 if (LockingMode == LM_LEGACY && java_thread == nullptr) {
1432 *monitor_info_count_ptr = 0;
1433 return JVMTI_ERROR_NONE;
1434 }
1435
1436 // growable array of jvmti monitors info on the C-heap
1437 GrowableArray<jvmtiMonitorStackDepthInfo*> *owned_monitors_list =
1438 new (mtServiceability) GrowableArray<jvmtiMonitorStackDepthInfo*>(1, mtServiceability);
1439
1440 Handle thread_handle(calling_thread, thread_oop);
1441 EscapeBarrier eb(java_thread != nullptr, calling_thread, java_thread);
1442 if (!eb.deoptimize_objects(MaxJavaStackTraceDepth)) {
1443 delete owned_monitors_list;
1444 return JVMTI_ERROR_OUT_OF_MEMORY;
1445 }
1446 // get owned monitors info with handshake
1447 GetOwnedMonitorInfoClosure op(this, calling_thread, owned_monitors_list);
1448 JvmtiHandshake::execute(&op, &tlh, java_thread, thread_handle);
1449 err = op.result();
1450
1451 jint owned_monitor_count = owned_monitors_list->length();
1452 if (err == JVMTI_ERROR_NONE) {
1453 if ((err = allocate(owned_monitor_count * sizeof(jvmtiMonitorStackDepthInfo),
1454 (unsigned char**)monitor_info_ptr)) == JVMTI_ERROR_NONE) {
1455 // copy to output array.
1456 for (int i = 0; i < owned_monitor_count; i++) {
1457 (*monitor_info_ptr)[i].monitor =
1458 ((jvmtiMonitorStackDepthInfo*)owned_monitors_list->at(i))->monitor;
1459 (*monitor_info_ptr)[i].stack_depth =
1460 ((jvmtiMonitorStackDepthInfo*)owned_monitors_list->at(i))->stack_depth;
1461 }
1462 }
1463 *monitor_info_count_ptr = owned_monitor_count;
1464 }
1465
1466 // clean up.
1467 for (int i = 0; i < owned_monitor_count; i++) {
1468 deallocate((unsigned char*)owned_monitors_list->at(i));
1469 }
1470 delete owned_monitors_list;
1471
1472 return err;
1473 } /* end GetOwnedMonitorStackDepthInfo */
1474
1475
1476 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
1477 // monitor_ptr - pre-checked for null
1478 jvmtiError
1479 JvmtiEnv::GetCurrentContendedMonitor(jthread thread, jobject* monitor_ptr) {
1480 JavaThread* current = JavaThread::current();
1481
1482 *monitor_ptr = nullptr;
1483
1484 // get contended monitor information with handshake
1485 GetCurrentContendedMonitorClosure op(this, current, monitor_ptr);
1486 JvmtiHandshake::execute(&op, thread);
1487 return op.result();
1488 } /* end GetCurrentContendedMonitor */
1489
1490
1491 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
1492 // proc - pre-checked for null
1493 // arg - null is a valid value, must be checked
1494 jvmtiError
1495 JvmtiEnv::RunAgentThread(jthread thread, jvmtiStartFunction proc, const void* arg, jint priority) {
1496 JavaThread* current_thread = JavaThread::current();
1497
1498 JavaThread* java_thread = nullptr;
1499 oop thread_oop = nullptr;
1500 ThreadsListHandle tlh(current_thread);
1501 jvmtiError err = JvmtiExport::cv_external_thread_to_JavaThread(tlh.list(), thread, &java_thread, &thread_oop);
1502 if (err != JVMTI_ERROR_NONE) {
1503 // We got an error code so we don't have a JavaThread *, but
1504 // only return an error from here if we didn't get a valid
1505 // thread_oop.
1506 if (thread_oop == nullptr) {
1507 return err;
1508 }
1509 // We have a valid thread_oop.
1510 }
1511
1512 if (thread_oop->is_a(vmClasses::BaseVirtualThread_klass())) {
1513 // No support for virtual threads.
1514 return JVMTI_ERROR_UNSUPPORTED_OPERATION;
1515 }
1516 if (java_thread != nullptr) {
1517 // 'thread' refers to an existing JavaThread.
1518 return JVMTI_ERROR_INVALID_THREAD;
1519 }
1520
1521 if (priority < JVMTI_THREAD_MIN_PRIORITY || priority > JVMTI_THREAD_MAX_PRIORITY) {
1522 return JVMTI_ERROR_INVALID_PRIORITY;
1523 }
1524
1525 Handle thread_hndl(current_thread, thread_oop);
1526
1527 JvmtiAgentThread* new_thread = new JvmtiAgentThread(this, proc, arg);
1528
1529 // At this point it may be possible that no osthread was created for the
1530 // JavaThread due to lack of resources.
1531 if (new_thread->osthread() == nullptr) {
1532 // The new thread is not known to Thread-SMR yet so we can just delete.
1533 delete new_thread;
1534 return JVMTI_ERROR_OUT_OF_MEMORY;
1535 }
1536
1537 JavaThread::start_internal_daemon(current_thread, new_thread, thread_hndl,
1538 (ThreadPriority)priority);
1539
1540 return JVMTI_ERROR_NONE;
1541 } /* end RunAgentThread */
1542
1543 //
1544 // Thread Group functions
1545 //
1546
1547 // group_count_ptr - pre-checked for null
1548 // groups_ptr - pre-checked for null
1549 jvmtiError
1550 JvmtiEnv::GetTopThreadGroups(jint* group_count_ptr, jthreadGroup** groups_ptr) {
1551 JavaThread* current_thread = JavaThread::current();
1552
1553 // Only one top level thread group now.
1554 *group_count_ptr = 1;
1555
1556 // Allocate memory to store global-refs to the thread groups.
1557 // Assume this area is freed by caller.
1558 *groups_ptr = (jthreadGroup *) jvmtiMalloc((sizeof(jthreadGroup)) * (*group_count_ptr));
1559
1560 NULL_CHECK(*groups_ptr, JVMTI_ERROR_OUT_OF_MEMORY);
1561
1562 // Convert oop to Handle, then convert Handle to global-ref.
1563 {
1564 HandleMark hm(current_thread);
1565 Handle system_thread_group(current_thread, Universe::system_thread_group());
1566 *groups_ptr[0] = jni_reference(system_thread_group);
1567 }
1568
1569 return JVMTI_ERROR_NONE;
1570 } /* end GetTopThreadGroups */
1571
1572
1573 // info_ptr - pre-checked for null
1574 jvmtiError
1575 JvmtiEnv::GetThreadGroupInfo(jthreadGroup group, jvmtiThreadGroupInfo* info_ptr) {
1576 Thread* current_thread = Thread::current();
1577 ResourceMark rm(current_thread);
1578 HandleMark hm(current_thread);
1579
1580 Handle group_obj (current_thread, JNIHandles::resolve_external_guard(group));
1581 NULL_CHECK(group_obj(), JVMTI_ERROR_INVALID_THREAD_GROUP);
1582
1583 const char* name;
1584 Handle parent_group;
1585 bool is_daemon;
1586 ThreadPriority max_priority;
1587
1588 name = java_lang_ThreadGroup::name(group_obj());
1589 parent_group = Handle(current_thread, java_lang_ThreadGroup::parent(group_obj()));
1590 is_daemon = java_lang_ThreadGroup::is_daemon(group_obj());
1591 max_priority = java_lang_ThreadGroup::maxPriority(group_obj());
1592
1593 info_ptr->is_daemon = is_daemon;
1594 info_ptr->max_priority = max_priority;
1595 info_ptr->parent = jni_reference(parent_group);
1596
1597 if (name != nullptr) {
1598 info_ptr->name = (char*)jvmtiMalloc(strlen(name)+1);
1599 NULL_CHECK(info_ptr->name, JVMTI_ERROR_OUT_OF_MEMORY);
1600 strcpy(info_ptr->name, name);
1601 } else {
1602 info_ptr->name = nullptr;
1603 }
1604
1605 return JVMTI_ERROR_NONE;
1606 } /* end GetThreadGroupInfo */
1607
1608 // thread_count_ptr - pre-checked for null
1609 // threads_ptr - pre-checked for null
1610 // group_count_ptr - pre-checked for null
1611 // groups_ptr - pre-checked for null
1612 jvmtiError
1613 JvmtiEnv::GetThreadGroupChildren(jthreadGroup group, jint* thread_count_ptr, jthread** threads_ptr, jint* group_count_ptr, jthreadGroup** groups_ptr) {
1614 jvmtiError err;
1615 JavaThread* current_thread = JavaThread::current();
1616 oop group_obj = JNIHandles::resolve_external_guard(group);
1617 NULL_CHECK(group_obj, JVMTI_ERROR_INVALID_THREAD_GROUP);
1618
1619 Handle *thread_objs = nullptr;
1620 objArrayHandle group_objs;
1621 jint nthreads = 0;
1622 jint ngroups = 0;
1623 int hidden_threads = 0;
1624
1625 ResourceMark rm(current_thread);
1626 HandleMark hm(current_thread);
1627
1628 Handle group_hdl(current_thread, group_obj);
1629
1630 err = get_live_threads(current_thread, group_hdl, &nthreads, &thread_objs);
1631 if (err != JVMTI_ERROR_NONE) {
1632 return err;
1633 }
1634 err = get_subgroups(current_thread, group_hdl, &ngroups, &group_objs);
1635 if (err != JVMTI_ERROR_NONE) {
1636 return err;
1637 }
1638
1639 *group_count_ptr = ngroups;
1640 *thread_count_ptr = nthreads;
1641 *threads_ptr = new_jthreadArray(nthreads, thread_objs);
1642 *groups_ptr = new_jthreadGroupArray(ngroups, group_objs);
1643 if (nthreads > 0 && *threads_ptr == nullptr) {
1644 return JVMTI_ERROR_OUT_OF_MEMORY;
1645 }
1646 if (ngroups > 0 && *groups_ptr == nullptr) {
1647 return JVMTI_ERROR_OUT_OF_MEMORY;
1648 }
1649
1650 return JVMTI_ERROR_NONE;
1651 } /* end GetThreadGroupChildren */
1652
1653
1654 //
1655 // Stack Frame functions
1656 //
1657
1658 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
1659 // max_frame_count - pre-checked to be greater than or equal to 0
1660 // frame_buffer - pre-checked for null
1661 // count_ptr - pre-checked for null
1662 jvmtiError
1663 JvmtiEnv::GetStackTrace(jthread thread, jint start_depth, jint max_frame_count, jvmtiFrameInfo* frame_buffer, jint* count_ptr) {
1664 GetStackTraceClosure op(this, start_depth, max_frame_count, frame_buffer, count_ptr);
1665 JvmtiHandshake::execute(&op, thread);
1666 return op.result();
1667 } /* end GetStackTrace */
1668
1669
1670 // max_frame_count - pre-checked to be greater than or equal to 0
1671 // stack_info_ptr - pre-checked for null
1672 // thread_count_ptr - pre-checked for null
1673 jvmtiError
1674 JvmtiEnv::GetAllStackTraces(jint max_frame_count, jvmtiStackInfo** stack_info_ptr, jint* thread_count_ptr) {
1675 jvmtiError err = JVMTI_ERROR_NONE;
1676 JavaThread* calling_thread = JavaThread::current();
1677
1678 // JVMTI get stack traces at safepoint.
1679 VM_GetAllStackTraces op(this, calling_thread, max_frame_count);
1680 VMThread::execute(&op);
1681 *thread_count_ptr = op.final_thread_count();
1682 *stack_info_ptr = op.stack_info();
1683 err = op.result();
1684 return err;
1685 } /* end GetAllStackTraces */
1686
1687
1688 // thread_count - pre-checked to be greater than or equal to 0
1689 // thread_list - pre-checked for null
1690 // max_frame_count - pre-checked to be greater than or equal to 0
1691 // stack_info_ptr - pre-checked for null
1692 jvmtiError
1693 JvmtiEnv::GetThreadListStackTraces(jint thread_count, const jthread* thread_list, jint max_frame_count, jvmtiStackInfo** stack_info_ptr) {
1694 jvmtiError err = JVMTI_ERROR_NONE;
1695
1696 if (thread_count == 1) {
1697 // Use direct handshake if we need to get only one stack trace.
1698 JavaThread *current_thread = JavaThread::current();
1699
1700 jthread thread = thread_list[0];
1701
1702 GetSingleStackTraceClosure op(this, current_thread, thread, max_frame_count);
1703 JvmtiHandshake::execute(&op, thread);
1704 err = op.result();
1705 if (err == JVMTI_ERROR_NONE) {
1706 *stack_info_ptr = op.stack_info();
1707 }
1708 } else {
1709 JvmtiVTMSTransitionDisabler disabler;
1710
1711 // JVMTI get stack traces at safepoint.
1712 VM_GetThreadListStackTraces op(this, thread_count, thread_list, max_frame_count);
1713 VMThread::execute(&op);
1714 err = op.result();
1715 if (err == JVMTI_ERROR_NONE) {
1716 *stack_info_ptr = op.stack_info();
1717 }
1718 }
1719 return err;
1720 } /* end GetThreadListStackTraces */
1721
1722
1723 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
1724 // count_ptr - pre-checked for null
1725 jvmtiError
1726 JvmtiEnv::GetFrameCount(jthread thread, jint* count_ptr) {
1727 GetFrameCountClosure op(this, count_ptr);
1728 JvmtiHandshake::execute(&op, thread);
1729 return op.result();
1730 } /* end GetFrameCount */
1731
1732
1733 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
1734 jvmtiError
1735 JvmtiEnv::PopFrame(jthread thread) {
1736 JavaThread* current_thread = JavaThread::current();
1737 HandleMark hm(current_thread);
1738
1739 if (thread == nullptr) {
1740 return JVMTI_ERROR_INVALID_THREAD;
1741 }
1742 JvmtiVTMSTransitionDisabler disabler(thread);
1743 ThreadsListHandle tlh(current_thread);
1744
1745 JavaThread* java_thread = nullptr;
1746 oop thread_obj = nullptr;
1747 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, current_thread, &java_thread, &thread_obj);
1748 Handle thread_handle(current_thread, thread_obj);
1749
1750 if (err != JVMTI_ERROR_NONE) {
1751 return err;
1752 }
1753 bool self = java_thread == current_thread;
1754
1755 err = check_non_suspended_or_opaque_frame(java_thread, thread_obj, self);
1756 if (err != JVMTI_ERROR_NONE) {
1757 return err;
1758 }
1759
1760 // retrieve or create the state
1761 JvmtiThreadState* state = JvmtiThreadState::state_for(java_thread);
1762 if (state == nullptr) {
1763 return JVMTI_ERROR_THREAD_NOT_ALIVE;
1764 }
1765
1766 // Eagerly reallocate scalar replaced objects.
1767 EscapeBarrier eb(true, current_thread, java_thread);
1768 if (!eb.deoptimize_objects(1)) {
1769 // Reallocation of scalar replaced objects failed -> return with error
1770 return JVMTI_ERROR_OUT_OF_MEMORY;
1771 }
1772
1773 MutexLocker mu(JvmtiThreadState_lock);
1774 UpdateForPopTopFrameClosure op(state);
1775 JvmtiHandshake::execute(&op, &tlh, java_thread, thread_handle);
1776 return op.result();
1777 } /* end PopFrame */
1778
1779
1780 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
1781 // depth - pre-checked as non-negative
1782 // method_ptr - pre-checked for null
1783 // location_ptr - pre-checked for null
1784 jvmtiError
1785 JvmtiEnv::GetFrameLocation(jthread thread, jint depth, jmethodID* method_ptr, jlocation* location_ptr) {
1786 GetFrameLocationClosure op(this, depth, method_ptr, location_ptr);
1787 JvmtiHandshake::execute(&op, thread);
1788 return op.result();
1789 } /* end GetFrameLocation */
1790
1791
1792 // Threads_lock NOT held, java_thread not protected by lock
1793 // depth - pre-checked as non-negative
1794 jvmtiError
1795 JvmtiEnv::NotifyFramePop(jthread thread, jint depth) {
1796 ResourceMark rm;
1797 JvmtiVTMSTransitionDisabler disabler(thread);
1798 JavaThread* current = JavaThread::current();
1799 ThreadsListHandle tlh(current);
1800
1801 JavaThread* java_thread = nullptr;
1802 oop thread_obj = nullptr;
1803 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, current, &java_thread, &thread_obj);
1804 if (err != JVMTI_ERROR_NONE) {
1805 return err;
1806 }
1807
1808 HandleMark hm(current);
1809 Handle thread_handle(current, thread_obj);
1810 JvmtiThreadState *state = JvmtiThreadState::state_for(java_thread, thread_handle);
1811 if (state == nullptr) {
1812 return JVMTI_ERROR_THREAD_NOT_ALIVE;
1813 }
1814
1815 SetOrClearFramePopClosure op(this, state, true /* set */, depth);
1816 MutexLocker mu(current, JvmtiThreadState_lock);
1817 JvmtiHandshake::execute(&op, &tlh, java_thread, thread_handle);
1818 return op.result();
1819 } /* end NotifyFramePop */
1820
1821 // Threads_lock NOT held, java_thread not protected by lock
1822 jvmtiError
1823 JvmtiEnv::ClearAllFramePops(jthread thread) {
1824 ResourceMark rm;
1825 JvmtiVTMSTransitionDisabler disabler(thread);
1826 JavaThread* current = JavaThread::current();
1827 ThreadsListHandle tlh(current);
1828
1829 JavaThread* java_thread = nullptr;
1830 oop thread_obj = nullptr;
1831 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, current, &java_thread, &thread_obj);
1832 if (err != JVMTI_ERROR_NONE) {
1833 return err;
1834 }
1835
1836 HandleMark hm(current);
1837 Handle thread_handle(current, thread_obj);
1838 JvmtiThreadState *state = JvmtiThreadState::state_for(java_thread, thread_handle);
1839 if (state == nullptr) {
1840 return JVMTI_ERROR_THREAD_NOT_ALIVE;
1841 }
1842
1843 SetOrClearFramePopClosure op(this, state, false /* clear all frame pops*/);
1844 MutexLocker mu(current, JvmtiThreadState_lock);
1845 JvmtiHandshake::execute(&op, &tlh, java_thread, thread_handle);
1846 return op.result();
1847 } /* end ClearAllFramePops */
1848
1849 //
1850 // Force Early Return functions
1851 //
1852
1853 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
1854 jvmtiError
1855 JvmtiEnv::ForceEarlyReturnObject(jthread thread, jobject value) {
1856 jvalue val;
1857 val.l = value;
1858 return force_early_return(thread, val, atos);
1859 } /* end ForceEarlyReturnObject */
1860
1861
1862 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
1863 jvmtiError
1864 JvmtiEnv::ForceEarlyReturnInt(jthread thread, jint value) {
1865 jvalue val;
1866 val.i = value;
1867 return force_early_return(thread, val, itos);
1868 } /* end ForceEarlyReturnInt */
1869
1870
1871 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
1872 jvmtiError
1873 JvmtiEnv::ForceEarlyReturnLong(jthread thread, jlong value) {
1874 jvalue val;
1875 val.j = value;
1876 return force_early_return(thread, val, ltos);
1877 } /* end ForceEarlyReturnLong */
1878
1879
1880 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
1881 jvmtiError
1882 JvmtiEnv::ForceEarlyReturnFloat(jthread thread, jfloat value) {
1883 jvalue val;
1884 val.f = value;
1885 return force_early_return(thread, val, ftos);
1886 } /* end ForceEarlyReturnFloat */
1887
1888
1889 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
1890 jvmtiError
1891 JvmtiEnv::ForceEarlyReturnDouble(jthread thread, jdouble value) {
1892 jvalue val;
1893 val.d = value;
1894 return force_early_return(thread, val, dtos);
1895 } /* end ForceEarlyReturnDouble */
1896
1897
1898 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
1899 jvmtiError
1900 JvmtiEnv::ForceEarlyReturnVoid(jthread thread) {
1901 jvalue val;
1902 val.j = 0L;
1903 return force_early_return(thread, val, vtos);
1904 } /* end ForceEarlyReturnVoid */
1905
1906
1907 //
1908 // Heap functions
1909 //
1910
1911 // klass - null is a valid value, must be checked
1912 // initial_object - null is a valid value, must be checked
1913 // callbacks - pre-checked for null
1914 // user_data - null is a valid value, must be checked
1915 jvmtiError
1916 JvmtiEnv::FollowReferences(jint heap_filter, jclass klass, jobject initial_object, const jvmtiHeapCallbacks* callbacks, const void* user_data) {
1917 // check klass if provided
1918 Klass* k = nullptr;
1919 if (klass != nullptr) {
1920 oop k_mirror = JNIHandles::resolve_external_guard(klass);
1921 if (k_mirror == nullptr) {
1922 return JVMTI_ERROR_INVALID_CLASS;
1923 }
1924 if (java_lang_Class::is_primitive(k_mirror)) {
1925 return JVMTI_ERROR_NONE;
1926 }
1927 k = java_lang_Class::as_Klass(k_mirror);
1928 if (klass == nullptr) {
1929 return JVMTI_ERROR_INVALID_CLASS;
1930 }
1931 }
1932
1933 if (initial_object != nullptr) {
1934 oop init_obj = JNIHandles::resolve_external_guard(initial_object);
1935 if (init_obj == nullptr) {
1936 return JVMTI_ERROR_INVALID_OBJECT;
1937 }
1938 }
1939
1940 Thread *thread = Thread::current();
1941 HandleMark hm(thread);
1942
1943 TraceTime t("FollowReferences", TRACETIME_LOG(Debug, jvmti, objecttagging));
1944 JvmtiTagMap::tag_map_for(this)->follow_references(heap_filter, k, initial_object, callbacks, user_data);
1945 return JVMTI_ERROR_NONE;
1946 } /* end FollowReferences */
1947
1948
1949 // klass - null is a valid value, must be checked
1950 // callbacks - pre-checked for null
1951 // user_data - null is a valid value, must be checked
1952 jvmtiError
1953 JvmtiEnv::IterateThroughHeap(jint heap_filter, jclass klass, const jvmtiHeapCallbacks* callbacks, const void* user_data) {
1954 // check klass if provided
1955 Klass* k = nullptr;
1956 if (klass != nullptr) {
1957 oop k_mirror = JNIHandles::resolve_external_guard(klass);
1958 if (k_mirror == nullptr) {
1959 return JVMTI_ERROR_INVALID_CLASS;
1960 }
1961 if (java_lang_Class::is_primitive(k_mirror)) {
1962 return JVMTI_ERROR_NONE;
1963 }
1964 k = java_lang_Class::as_Klass(k_mirror);
1965 if (k == nullptr) {
1966 return JVMTI_ERROR_INVALID_CLASS;
1967 }
1968 }
1969
1970 TraceTime t("IterateThroughHeap", TRACETIME_LOG(Debug, jvmti, objecttagging));
1971 JvmtiTagMap::tag_map_for(this)->iterate_through_heap(heap_filter, k, callbacks, user_data);
1972 return JVMTI_ERROR_NONE;
1973 } /* end IterateThroughHeap */
1974
1975
1976 // tag_ptr - pre-checked for null
1977 jvmtiError
1978 JvmtiEnv::GetTag(jobject object, jlong* tag_ptr) {
1979 oop o = JNIHandles::resolve_external_guard(object);
1980 NULL_CHECK(o, JVMTI_ERROR_INVALID_OBJECT);
1981 *tag_ptr = JvmtiTagMap::tag_map_for(this)->get_tag(object);
1982 return JVMTI_ERROR_NONE;
1983 } /* end GetTag */
1984
1985
1986 jvmtiError
1987 JvmtiEnv::SetTag(jobject object, jlong tag) {
1988 oop o = JNIHandles::resolve_external_guard(object);
1989 NULL_CHECK(o, JVMTI_ERROR_INVALID_OBJECT);
1990 JvmtiTagMap::tag_map_for(this)->set_tag(object, tag);
1991 return JVMTI_ERROR_NONE;
1992 } /* end SetTag */
1993
1994
1995 // tag_count - pre-checked to be greater than or equal to 0
1996 // tags - pre-checked for null
1997 // count_ptr - pre-checked for null
1998 // object_result_ptr - null is a valid value, must be checked
1999 // tag_result_ptr - null is a valid value, must be checked
2000 jvmtiError
2001 JvmtiEnv::GetObjectsWithTags(jint tag_count, const jlong* tags, jint* count_ptr, jobject** object_result_ptr, jlong** tag_result_ptr) {
2002 TraceTime t("GetObjectsWithTags", TRACETIME_LOG(Debug, jvmti, objecttagging));
2003 return JvmtiTagMap::tag_map_for(this)->get_objects_with_tags((jlong*)tags, tag_count, count_ptr, object_result_ptr, tag_result_ptr);
2004 } /* end GetObjectsWithTags */
2005
2006
2007 jvmtiError
2008 JvmtiEnv::ForceGarbageCollection() {
2009 Universe::heap()->collect(GCCause::_jvmti_force_gc);
2010 return JVMTI_ERROR_NONE;
2011 } /* end ForceGarbageCollection */
2012
2013
2014 //
2015 // Heap (1.0) functions
2016 //
2017
2018 // object_reference_callback - pre-checked for null
2019 // user_data - null is a valid value, must be checked
2020 jvmtiError
2021 JvmtiEnv::IterateOverObjectsReachableFromObject(jobject object, jvmtiObjectReferenceCallback object_reference_callback, const void* user_data) {
2022 oop o = JNIHandles::resolve_external_guard(object);
2023 NULL_CHECK(o, JVMTI_ERROR_INVALID_OBJECT);
2024 JvmtiTagMap::tag_map_for(this)->iterate_over_objects_reachable_from_object(object, object_reference_callback, user_data);
2025 return JVMTI_ERROR_NONE;
2026 } /* end IterateOverObjectsReachableFromObject */
2027
2028
2029 // heap_root_callback - null is a valid value, must be checked
2030 // stack_ref_callback - null is a valid value, must be checked
2031 // object_ref_callback - null is a valid value, must be checked
2032 // user_data - null is a valid value, must be checked
2033 jvmtiError
2034 JvmtiEnv::IterateOverReachableObjects(jvmtiHeapRootCallback heap_root_callback, jvmtiStackReferenceCallback stack_ref_callback, jvmtiObjectReferenceCallback object_ref_callback, const void* user_data) {
2035 TraceTime t("IterateOverReachableObjects", TRACETIME_LOG(Debug, jvmti, objecttagging));
2036 JvmtiTagMap::tag_map_for(this)->iterate_over_reachable_objects(heap_root_callback, stack_ref_callback, object_ref_callback, user_data);
2037 return JVMTI_ERROR_NONE;
2038 } /* end IterateOverReachableObjects */
2039
2040
2041 // heap_object_callback - pre-checked for null
2042 // user_data - null is a valid value, must be checked
2043 jvmtiError
2044 JvmtiEnv::IterateOverHeap(jvmtiHeapObjectFilter object_filter, jvmtiHeapObjectCallback heap_object_callback, const void* user_data) {
2045 TraceTime t("IterateOverHeap", TRACETIME_LOG(Debug, jvmti, objecttagging));
2046 Thread *thread = Thread::current();
2047 HandleMark hm(thread);
2048 JvmtiTagMap::tag_map_for(this)->iterate_over_heap(object_filter, nullptr, heap_object_callback, user_data);
2049 return JVMTI_ERROR_NONE;
2050 } /* end IterateOverHeap */
2051
2052
2053 // k_mirror - may be primitive, this must be checked
2054 // heap_object_callback - pre-checked for null
2055 // user_data - null is a valid value, must be checked
2056 jvmtiError
2057 JvmtiEnv::IterateOverInstancesOfClass(oop k_mirror, jvmtiHeapObjectFilter object_filter, jvmtiHeapObjectCallback heap_object_callback, const void* user_data) {
2058 if (java_lang_Class::is_primitive(k_mirror)) {
2059 // DO PRIMITIVE CLASS PROCESSING
2060 return JVMTI_ERROR_NONE;
2061 }
2062 Klass* klass = java_lang_Class::as_Klass(k_mirror);
2063 if (klass == nullptr) {
2064 return JVMTI_ERROR_INVALID_CLASS;
2065 }
2066 TraceTime t("IterateOverInstancesOfClass", TRACETIME_LOG(Debug, jvmti, objecttagging));
2067 JvmtiTagMap::tag_map_for(this)->iterate_over_heap(object_filter, klass, heap_object_callback, user_data);
2068 return JVMTI_ERROR_NONE;
2069 } /* end IterateOverInstancesOfClass */
2070
2071
2072 //
2073 // Local Variable functions
2074 //
2075
2076 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
2077 // depth - pre-checked as non-negative
2078 // value_ptr - pre-checked for null
2079 jvmtiError
2080 JvmtiEnv::GetLocalObject(jthread thread, jint depth, jint slot, jobject* value_ptr) {
2081 JavaThread* current_thread = JavaThread::current();
2082 // rm object is created to clean up the javaVFrame created in
2083 // doit_prologue(), but after doit() is finished with it.
2084 ResourceMark rm(current_thread);
2085 HandleMark hm(current_thread);
2086 JvmtiVTMSTransitionDisabler disabler(thread);
2087 ThreadsListHandle tlh(current_thread);
2088
2089 JavaThread* java_thread = nullptr;
2090 oop thread_obj = nullptr;
2091 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, current_thread, &java_thread, &thread_obj);
2092 if (err != JVMTI_ERROR_NONE) {
2093 return err;
2094 }
2095 bool self = is_JavaThread_current(java_thread, thread_obj);
2096
2097 if (java_lang_VirtualThread::is_instance(thread_obj)) {
2098 VM_VirtualThreadGetOrSetLocal op(this, Handle(current_thread, thread_obj),
2099 current_thread, depth, slot, self);
2100 VMThread::execute(&op);
2101 err = op.result();
2102 if (err == JVMTI_ERROR_NONE) {
2103 *value_ptr = op.value().l;
2104 }
2105 } else {
2106 // Support for ordinary threads
2107 VM_GetOrSetLocal op(java_thread, current_thread, depth, slot, self);
2108 VMThread::execute(&op);
2109 err = op.result();
2110 if (err == JVMTI_ERROR_NONE) {
2111 *value_ptr = op.value().l;
2112 }
2113 }
2114 return err;
2115 } /* end GetLocalObject */
2116
2117 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
2118 // depth - pre-checked as non-negative
2119 // value - pre-checked for null
2120 jvmtiError
2121 JvmtiEnv::GetLocalInstance(jthread thread, jint depth, jobject* value_ptr){
2122 JavaThread* current_thread = JavaThread::current();
2123 // rm object is created to clean up the javaVFrame created in
2124 // doit_prologue(), but after doit() is finished with it.
2125 ResourceMark rm(current_thread);
2126 HandleMark hm(current_thread);
2127 JvmtiVTMSTransitionDisabler disabler(thread);
2128 ThreadsListHandle tlh(current_thread);
2129
2130 JavaThread* java_thread = nullptr;
2131 oop thread_obj = nullptr;
2132 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, current_thread, &java_thread, &thread_obj);
2133 if (err != JVMTI_ERROR_NONE) {
2134 return err;
2135 }
2136 bool self = is_JavaThread_current(java_thread, thread_obj);
2137
2138 if (java_lang_VirtualThread::is_instance(thread_obj)) {
2139 VM_VirtualThreadGetReceiver op(this, Handle(current_thread, thread_obj),
2140 current_thread, depth, self);
2141 VMThread::execute(&op);
2142 err = op.result();
2143 if (err == JVMTI_ERROR_NONE) {
2144 *value_ptr = op.value().l;
2145 }
2146 } else {
2147 // Support for ordinary threads
2148 VM_GetReceiver op(java_thread, current_thread, depth, self);
2149 VMThread::execute(&op);
2150 err = op.result();
2151 if (err == JVMTI_ERROR_NONE) {
2152 *value_ptr = op.value().l;
2153 }
2154 }
2155 return err;
2156 } /* end GetLocalInstance */
2157
2158
2159 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
2160 // depth - pre-checked as non-negative
2161 // value_ptr - pre-checked for null
2162 jvmtiError
2163 JvmtiEnv::GetLocalInt(jthread thread, jint depth, jint slot, jint* value_ptr) {
2164 JavaThread* current_thread = JavaThread::current();
2165 // rm object is created to clean up the javaVFrame created in
2166 // doit_prologue(), but after doit() is finished with it.
2167 ResourceMark rm(current_thread);
2168 HandleMark hm(current_thread);
2169 JvmtiVTMSTransitionDisabler disabler(thread);
2170 ThreadsListHandle tlh(current_thread);
2171
2172 JavaThread* java_thread = nullptr;
2173 oop thread_obj = nullptr;
2174 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, current_thread, &java_thread, &thread_obj);
2175 if (err != JVMTI_ERROR_NONE) {
2176 return err;
2177 }
2178 bool self = is_JavaThread_current(java_thread, thread_obj);
2179
2180 if (java_lang_VirtualThread::is_instance(thread_obj)) {
2181 VM_VirtualThreadGetOrSetLocal op(this, Handle(current_thread, thread_obj),
2182 depth, slot, T_INT, self);
2183 VMThread::execute(&op);
2184 err = op.result();
2185 if (err == JVMTI_ERROR_NONE) {
2186 *value_ptr = op.value().i;
2187 }
2188 } else {
2189 // Support for ordinary threads
2190 VM_GetOrSetLocal op(java_thread, depth, slot, T_INT, self);
2191 VMThread::execute(&op);
2192 err = op.result();
2193 if (err == JVMTI_ERROR_NONE) {
2194 *value_ptr = op.value().i;
2195 }
2196 }
2197 return err;
2198 } /* end GetLocalInt */
2199
2200
2201 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
2202 // depth - pre-checked as non-negative
2203 // value_ptr - pre-checked for null
2204 jvmtiError
2205 JvmtiEnv::GetLocalLong(jthread thread, jint depth, jint slot, jlong* value_ptr) {
2206 JavaThread* current_thread = JavaThread::current();
2207 // rm object is created to clean up the javaVFrame created in
2208 // doit_prologue(), but after doit() is finished with it.
2209 ResourceMark rm(current_thread);
2210 HandleMark hm(current_thread);
2211 JvmtiVTMSTransitionDisabler disabler(thread);
2212 ThreadsListHandle tlh(current_thread);
2213
2214 JavaThread* java_thread = nullptr;
2215 oop thread_obj = nullptr;
2216 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, current_thread, &java_thread, &thread_obj);
2217 if (err != JVMTI_ERROR_NONE) {
2218 return err;
2219 }
2220 bool self = is_JavaThread_current(java_thread, thread_obj);
2221
2222 if (java_lang_VirtualThread::is_instance(thread_obj)) {
2223 VM_VirtualThreadGetOrSetLocal op(this, Handle(current_thread, thread_obj),
2224 depth, slot, T_LONG, self);
2225 VMThread::execute(&op);
2226 err = op.result();
2227 if (err == JVMTI_ERROR_NONE) {
2228 *value_ptr = op.value().j;
2229 }
2230 } else {
2231 // Support for ordinary threads
2232 VM_GetOrSetLocal op(java_thread, depth, slot, T_LONG, self);
2233 VMThread::execute(&op);
2234 err = op.result();
2235 if (err == JVMTI_ERROR_NONE) {
2236 *value_ptr = op.value().j;
2237 }
2238 }
2239 return err;
2240 } /* end GetLocalLong */
2241
2242
2243 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
2244 // depth - pre-checked as non-negative
2245 // value_ptr - pre-checked for null
2246 jvmtiError
2247 JvmtiEnv::GetLocalFloat(jthread thread, jint depth, jint slot, jfloat* value_ptr) {
2248 JavaThread* current_thread = JavaThread::current();
2249 // rm object is created to clean up the javaVFrame created in
2250 // doit_prologue(), but after doit() is finished with it.
2251 ResourceMark rm(current_thread);
2252 HandleMark hm(current_thread);
2253 JvmtiVTMSTransitionDisabler disabler(thread);
2254 ThreadsListHandle tlh(current_thread);
2255
2256 JavaThread* java_thread = nullptr;
2257 oop thread_obj = nullptr;
2258 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, current_thread, &java_thread, &thread_obj);
2259 if (err != JVMTI_ERROR_NONE) {
2260 return err;
2261 }
2262 bool self = is_JavaThread_current(java_thread, thread_obj);
2263
2264 if (java_lang_VirtualThread::is_instance(thread_obj)) {
2265 VM_VirtualThreadGetOrSetLocal op(this, Handle(current_thread, thread_obj),
2266 depth, slot, T_FLOAT, self);
2267 VMThread::execute(&op);
2268 err = op.result();
2269 if (err == JVMTI_ERROR_NONE) {
2270 *value_ptr = op.value().f;
2271 }
2272 } else {
2273 // Support for ordinary threads
2274 VM_GetOrSetLocal op(java_thread, depth, slot, T_FLOAT, self);
2275 VMThread::execute(&op);
2276 err = op.result();
2277 if (err == JVMTI_ERROR_NONE) {
2278 *value_ptr = op.value().f;
2279 }
2280 }
2281 return err;
2282 } /* end GetLocalFloat */
2283
2284
2285 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
2286 // depth - pre-checked as non-negative
2287 // value_ptr - pre-checked for null
2288 jvmtiError
2289 JvmtiEnv::GetLocalDouble(jthread thread, jint depth, jint slot, jdouble* value_ptr) {
2290 JavaThread* current_thread = JavaThread::current();
2291 // rm object is created to clean up the javaVFrame created in
2292 // doit_prologue(), but after doit() is finished with it.
2293 ResourceMark rm(current_thread);
2294 HandleMark hm(current_thread);
2295 JvmtiVTMSTransitionDisabler disabler(thread);
2296 ThreadsListHandle tlh(current_thread);
2297
2298 JavaThread* java_thread = nullptr;
2299 oop thread_obj = nullptr;
2300 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, current_thread, &java_thread, &thread_obj);
2301 if (err != JVMTI_ERROR_NONE) {
2302 return err;
2303 }
2304 bool self = is_JavaThread_current(java_thread, thread_obj);
2305
2306 if (java_lang_VirtualThread::is_instance(thread_obj)) {
2307 VM_VirtualThreadGetOrSetLocal op(this, Handle(current_thread, thread_obj),
2308 depth, slot, T_DOUBLE, self);
2309 VMThread::execute(&op);
2310 err = op.result();
2311 if (err == JVMTI_ERROR_NONE) {
2312 *value_ptr = op.value().d;
2313 }
2314 } else {
2315 // Support for ordinary threads
2316 VM_GetOrSetLocal op(java_thread, depth, slot, T_DOUBLE, self);
2317 VMThread::execute(&op);
2318 err = op.result();
2319 if (err == JVMTI_ERROR_NONE) {
2320 *value_ptr = op.value().d;
2321 }
2322 }
2323 return err;
2324 } /* end GetLocalDouble */
2325
2326
2327 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
2328 // depth - pre-checked as non-negative
2329 jvmtiError
2330 JvmtiEnv::SetLocalObject(jthread thread, jint depth, jint slot, jobject value) {
2331 JavaThread* current_thread = JavaThread::current();
2332 // rm object is created to clean up the javaVFrame created in
2333 // doit_prologue(), but after doit() is finished with it.
2334 ResourceMark rm(current_thread);
2335 HandleMark hm(current_thread);
2336 JvmtiVTMSTransitionDisabler disabler(thread);
2337 ThreadsListHandle tlh(current_thread);
2338
2339 JavaThread* java_thread = nullptr;
2340 oop thread_obj = nullptr;
2341 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, current_thread, &java_thread, &thread_obj);
2342 if (err != JVMTI_ERROR_NONE) {
2343 return err;
2344 }
2345 bool self = is_JavaThread_current(java_thread, thread_obj);
2346 jvalue val;
2347 val.l = value;
2348
2349 if (java_lang_VirtualThread::is_instance(thread_obj)) {
2350 VM_VirtualThreadGetOrSetLocal op(this, Handle(current_thread, thread_obj),
2351 depth, slot, T_OBJECT, val, self);
2352 VMThread::execute(&op);
2353 err = op.result();
2354 } else {
2355 // Support for ordinary threads
2356 VM_GetOrSetLocal op(java_thread, depth, slot, T_OBJECT, val, self);
2357 VMThread::execute(&op);
2358 err = op.result();
2359 }
2360 return err;
2361 } /* end SetLocalObject */
2362
2363
2364 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
2365 // depth - pre-checked as non-negative
2366 jvmtiError
2367 JvmtiEnv::SetLocalInt(jthread thread, jint depth, jint slot, jint value) {
2368 JavaThread* current_thread = JavaThread::current();
2369 // rm object is created to clean up the javaVFrame created in
2370 // doit_prologue(), but after doit() is finished with it.
2371 ResourceMark rm(current_thread);
2372 HandleMark hm(current_thread);
2373 JvmtiVTMSTransitionDisabler disabler(thread);
2374 ThreadsListHandle tlh(current_thread);
2375
2376 JavaThread* java_thread = nullptr;
2377 oop thread_obj = nullptr;
2378 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, current_thread, &java_thread, &thread_obj);
2379 if (err != JVMTI_ERROR_NONE) {
2380 return err;
2381 }
2382 bool self = is_JavaThread_current(java_thread, thread_obj);
2383 jvalue val;
2384 val.i = value;
2385
2386 if (java_lang_VirtualThread::is_instance(thread_obj)) {
2387 VM_VirtualThreadGetOrSetLocal op(this, Handle(current_thread, thread_obj),
2388 depth, slot, T_INT, val, self);
2389 VMThread::execute(&op);
2390 err = op.result();
2391 } else {
2392 // Support for ordinary threads
2393 VM_GetOrSetLocal op(java_thread, depth, slot, T_INT, val, self);
2394 VMThread::execute(&op);
2395 err = op.result();
2396 }
2397 return err;
2398 } /* end SetLocalInt */
2399
2400
2401 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
2402 // depth - pre-checked as non-negative
2403 jvmtiError
2404 JvmtiEnv::SetLocalLong(jthread thread, jint depth, jint slot, jlong value) {
2405 JavaThread* current_thread = JavaThread::current();
2406 // rm object is created to clean up the javaVFrame created in
2407 // doit_prologue(), but after doit() is finished with it.
2408 ResourceMark rm(current_thread);
2409 HandleMark hm(current_thread);
2410 JvmtiVTMSTransitionDisabler disabler(thread);
2411 ThreadsListHandle tlh(current_thread);
2412
2413 JavaThread* java_thread = nullptr;
2414 oop thread_obj = nullptr;
2415 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, current_thread, &java_thread, &thread_obj);
2416 if (err != JVMTI_ERROR_NONE) {
2417 return err;
2418 }
2419 bool self = is_JavaThread_current(java_thread, thread_obj);
2420 jvalue val;
2421 val.j = value;
2422
2423 if (java_lang_VirtualThread::is_instance(thread_obj)) {
2424 VM_VirtualThreadGetOrSetLocal op(this, Handle(current_thread, thread_obj),
2425 depth, slot, T_LONG, val, self);
2426 VMThread::execute(&op);
2427 err = op.result();
2428 } else {
2429 // Support for ordinary threads
2430 VM_GetOrSetLocal op(java_thread, depth, slot, T_LONG, val, self);
2431 VMThread::execute(&op);
2432 err = op.result();
2433 }
2434 return err;
2435 } /* end SetLocalLong */
2436
2437
2438 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
2439 // depth - pre-checked as non-negative
2440 jvmtiError
2441 JvmtiEnv::SetLocalFloat(jthread thread, jint depth, jint slot, jfloat value) {
2442 JavaThread* current_thread = JavaThread::current();
2443 // rm object is created to clean up the javaVFrame created in
2444 // doit_prologue(), but after doit() is finished with it.
2445 ResourceMark rm(current_thread);
2446 HandleMark hm(current_thread);
2447 JvmtiVTMSTransitionDisabler disabler(thread);
2448 ThreadsListHandle tlh(current_thread);
2449
2450 JavaThread* java_thread = nullptr;
2451 oop thread_obj = nullptr;
2452 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, current_thread, &java_thread, &thread_obj);
2453 if (err != JVMTI_ERROR_NONE) {
2454 return err;
2455 }
2456 bool self = is_JavaThread_current(java_thread, thread_obj);
2457 jvalue val;
2458 val.f = value;
2459
2460 if (java_lang_VirtualThread::is_instance(thread_obj)) {
2461 VM_VirtualThreadGetOrSetLocal op(this, Handle(current_thread, thread_obj),
2462 depth, slot, T_FLOAT, val, self);
2463 VMThread::execute(&op);
2464 err = op.result();
2465 } else {
2466 // Support for ordinary threads
2467 VM_GetOrSetLocal op(java_thread, depth, slot, T_FLOAT, val, self);
2468 VMThread::execute(&op);
2469 err = op.result();
2470 }
2471 return err;
2472 } /* end SetLocalFloat */
2473
2474
2475 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
2476 // depth - pre-checked as non-negative
2477 jvmtiError
2478 JvmtiEnv::SetLocalDouble(jthread thread, jint depth, jint slot, jdouble value) {
2479 JavaThread* current_thread = JavaThread::current();
2480 // rm object is created to clean up the javaVFrame created in
2481 // doit_prologue(), but after doit() is finished with it.
2482 ResourceMark rm(current_thread);
2483 HandleMark hm(current_thread);
2484 JvmtiVTMSTransitionDisabler disabler(thread);
2485 ThreadsListHandle tlh(current_thread);
2486
2487 JavaThread* java_thread = nullptr;
2488 oop thread_obj = nullptr;
2489 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, current_thread, &java_thread, &thread_obj);
2490 if (err != JVMTI_ERROR_NONE) {
2491 return err;
2492 }
2493 bool self = is_JavaThread_current(java_thread, thread_obj);
2494 jvalue val;
2495 val.d = value;
2496
2497 if (java_lang_VirtualThread::is_instance(thread_obj)) {
2498 VM_VirtualThreadGetOrSetLocal op(this, Handle(current_thread, thread_obj),
2499 depth, slot, T_DOUBLE, val, self);
2500 VMThread::execute(&op);
2501 err = op.result();
2502 } else {
2503 // Support for ordinary threads
2504 VM_GetOrSetLocal op(java_thread, depth, slot, T_DOUBLE, val, self);
2505 VMThread::execute(&op);
2506 err = op.result();
2507 }
2508 return err;
2509 } /* end SetLocalDouble */
2510
2511
2512 //
2513 // Breakpoint functions
2514 //
2515
2516 // method - pre-checked for validity, but may be null meaning obsolete method
2517 jvmtiError
2518 JvmtiEnv::SetBreakpoint(Method* method, jlocation location) {
2519 NULL_CHECK(method, JVMTI_ERROR_INVALID_METHODID);
2520 if (location < 0) { // simple invalid location check first
2521 return JVMTI_ERROR_INVALID_LOCATION;
2522 }
2523 // verify that the breakpoint is not past the end of the method
2524 if (location >= (jlocation) method->code_size()) {
2525 return JVMTI_ERROR_INVALID_LOCATION;
2526 }
2527
2528 ResourceMark rm;
2529 JvmtiBreakpoint bp(method, location);
2530 JvmtiBreakpoints& jvmti_breakpoints = JvmtiCurrentBreakpoints::get_jvmti_breakpoints();
2531 if (jvmti_breakpoints.set(bp) == JVMTI_ERROR_DUPLICATE)
2532 return JVMTI_ERROR_DUPLICATE;
2533
2534 if (TraceJVMTICalls) {
2535 jvmti_breakpoints.print();
2536 }
2537
2538 return JVMTI_ERROR_NONE;
2539 } /* end SetBreakpoint */
2540
2541
2542 // method - pre-checked for validity, but may be null meaning obsolete method
2543 jvmtiError
2544 JvmtiEnv::ClearBreakpoint(Method* method, jlocation location) {
2545 NULL_CHECK(method, JVMTI_ERROR_INVALID_METHODID);
2546
2547 if (location < 0) { // simple invalid location check first
2548 return JVMTI_ERROR_INVALID_LOCATION;
2549 }
2550
2551 // verify that the breakpoint is not past the end of the method
2552 if (location >= (jlocation) method->code_size()) {
2553 return JVMTI_ERROR_INVALID_LOCATION;
2554 }
2555
2556 JvmtiBreakpoint bp(method, location);
2557
2558 JvmtiBreakpoints& jvmti_breakpoints = JvmtiCurrentBreakpoints::get_jvmti_breakpoints();
2559 if (jvmti_breakpoints.clear(bp) == JVMTI_ERROR_NOT_FOUND)
2560 return JVMTI_ERROR_NOT_FOUND;
2561
2562 if (TraceJVMTICalls) {
2563 jvmti_breakpoints.print();
2564 }
2565
2566 return JVMTI_ERROR_NONE;
2567 } /* end ClearBreakpoint */
2568
2569
2570 //
2571 // Watched Field functions
2572 //
2573
2574 jvmtiError
2575 JvmtiEnv::SetFieldAccessWatch(fieldDescriptor* fdesc_ptr) {
2576 JvmtiVTMSTransitionDisabler disabler;
2577 // make sure we haven't set this watch before
2578 if (fdesc_ptr->is_field_access_watched()) return JVMTI_ERROR_DUPLICATE;
2579 fdesc_ptr->set_is_field_access_watched(true);
2580
2581 JvmtiEventController::change_field_watch(JVMTI_EVENT_FIELD_ACCESS, true);
2582
2583 return JVMTI_ERROR_NONE;
2584 } /* end SetFieldAccessWatch */
2585
2586
2587 jvmtiError
2588 JvmtiEnv::ClearFieldAccessWatch(fieldDescriptor* fdesc_ptr) {
2589 JvmtiVTMSTransitionDisabler disabler;
2590 // make sure we have a watch to clear
2591 if (!fdesc_ptr->is_field_access_watched()) return JVMTI_ERROR_NOT_FOUND;
2592 fdesc_ptr->set_is_field_access_watched(false);
2593
2594 JvmtiEventController::change_field_watch(JVMTI_EVENT_FIELD_ACCESS, false);
2595
2596 return JVMTI_ERROR_NONE;
2597 } /* end ClearFieldAccessWatch */
2598
2599
2600 jvmtiError
2601 JvmtiEnv::SetFieldModificationWatch(fieldDescriptor* fdesc_ptr) {
2602 JvmtiVTMSTransitionDisabler disabler;
2603 // make sure we haven't set this watch before
2604 if (fdesc_ptr->is_field_modification_watched()) return JVMTI_ERROR_DUPLICATE;
2605 fdesc_ptr->set_is_field_modification_watched(true);
2606
2607 JvmtiEventController::change_field_watch(JVMTI_EVENT_FIELD_MODIFICATION, true);
2608
2609 return JVMTI_ERROR_NONE;
2610 } /* end SetFieldModificationWatch */
2611
2612
2613 jvmtiError
2614 JvmtiEnv::ClearFieldModificationWatch(fieldDescriptor* fdesc_ptr) {
2615 JvmtiVTMSTransitionDisabler disabler;
2616 // make sure we have a watch to clear
2617 if (!fdesc_ptr->is_field_modification_watched()) return JVMTI_ERROR_NOT_FOUND;
2618 fdesc_ptr->set_is_field_modification_watched(false);
2619
2620 JvmtiEventController::change_field_watch(JVMTI_EVENT_FIELD_MODIFICATION, false);
2621
2622 return JVMTI_ERROR_NONE;
2623 } /* end ClearFieldModificationWatch */
2624
2625 //
2626 // Class functions
2627 //
2628
2629
2630 // k_mirror - may be primitive, this must be checked
2631 // signature_ptr - null is a valid value, must be checked
2632 // generic_ptr - null is a valid value, must be checked
2633 jvmtiError
2634 JvmtiEnv::GetClassSignature(oop k_mirror, char** signature_ptr, char** generic_ptr) {
2635 ResourceMark rm;
2636 bool isPrimitive = java_lang_Class::is_primitive(k_mirror);
2637 Klass* k = nullptr;
2638 if (!isPrimitive) {
2639 k = java_lang_Class::as_Klass(k_mirror);
2640 NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS);
2641 }
2642 if (signature_ptr != nullptr) {
2643 char* result = nullptr;
2644 if (isPrimitive) {
2645 char tchar = type2char(java_lang_Class::primitive_type(k_mirror));
2646 result = (char*) jvmtiMalloc(2);
2647 result[0] = tchar;
2648 result[1] = '\0';
2649 } else {
2650 const char* class_sig = k->signature_name();
2651 result = (char *) jvmtiMalloc(strlen(class_sig)+1);
2652 strcpy(result, class_sig);
2653 }
2654 *signature_ptr = result;
2655 }
2656 if (generic_ptr != nullptr) {
2657 *generic_ptr = nullptr;
2658 if (!isPrimitive && k->is_instance_klass()) {
2659 Symbol* soo = InstanceKlass::cast(k)->generic_signature();
2660 if (soo != nullptr) {
2661 const char *gen_sig = soo->as_C_string();
2662 if (gen_sig != nullptr) {
2663 char* gen_result;
2664 jvmtiError err = allocate(strlen(gen_sig) + 1,
2665 (unsigned char **)&gen_result);
2666 if (err != JVMTI_ERROR_NONE) {
2667 return err;
2668 }
2669 strcpy(gen_result, gen_sig);
2670 *generic_ptr = gen_result;
2671 }
2672 }
2673 }
2674 }
2675 return JVMTI_ERROR_NONE;
2676 } /* end GetClassSignature */
2677
2678
2679 // k_mirror - may be primitive, this must be checked
2680 // status_ptr - pre-checked for null
2681 jvmtiError
2682 JvmtiEnv::GetClassStatus(oop k_mirror, jint* status_ptr) {
2683 jint result = 0;
2684 if (java_lang_Class::is_primitive(k_mirror)) {
2685 result |= JVMTI_CLASS_STATUS_PRIMITIVE;
2686 } else {
2687 Klass* k = java_lang_Class::as_Klass(k_mirror);
2688 NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS);
2689 result = k->jvmti_class_status();
2690 }
2691 *status_ptr = result;
2692
2693 return JVMTI_ERROR_NONE;
2694 } /* end GetClassStatus */
2695
2696
2697 // k_mirror - may be primitive, this must be checked
2698 // source_name_ptr - pre-checked for null
2699 jvmtiError
2700 JvmtiEnv::GetSourceFileName(oop k_mirror, char** source_name_ptr) {
2701 if (java_lang_Class::is_primitive(k_mirror)) {
2702 return JVMTI_ERROR_ABSENT_INFORMATION;
2703 }
2704 Klass* k_klass = java_lang_Class::as_Klass(k_mirror);
2705 NULL_CHECK(k_klass, JVMTI_ERROR_INVALID_CLASS);
2706
2707 if (!k_klass->is_instance_klass()) {
2708 return JVMTI_ERROR_ABSENT_INFORMATION;
2709 }
2710
2711 Symbol* sfnOop = InstanceKlass::cast(k_klass)->source_file_name();
2712 NULL_CHECK(sfnOop, JVMTI_ERROR_ABSENT_INFORMATION);
2713 {
2714 JavaThread* current_thread = JavaThread::current();
2715 ResourceMark rm(current_thread);
2716 const char* sfncp = (const char*) sfnOop->as_C_string();
2717 *source_name_ptr = (char *) jvmtiMalloc(strlen(sfncp)+1);
2718 strcpy(*source_name_ptr, sfncp);
2719 }
2720
2721 return JVMTI_ERROR_NONE;
2722 } /* end GetSourceFileName */
2723
2724
2725 // k_mirror - may be primitive, this must be checked
2726 // modifiers_ptr - pre-checked for null
2727 jvmtiError
2728 JvmtiEnv::GetClassModifiers(oop k_mirror, jint* modifiers_ptr) {
2729 jint result = java_lang_Class::modifiers(k_mirror);
2730 *modifiers_ptr = result;
2731
2732 return JVMTI_ERROR_NONE;
2733 } /* end GetClassModifiers */
2734
2735
2736 // k_mirror - may be primitive, this must be checked
2737 // method_count_ptr - pre-checked for null
2738 // methods_ptr - pre-checked for null
2739 jvmtiError
2740 JvmtiEnv::GetClassMethods(oop k_mirror, jint* method_count_ptr, jmethodID** methods_ptr) {
2741 JavaThread* current_thread = JavaThread::current();
2742 HandleMark hm(current_thread);
2743
2744 if (java_lang_Class::is_primitive(k_mirror)) {
2745 *method_count_ptr = 0;
2746 *methods_ptr = (jmethodID*) jvmtiMalloc(0 * sizeof(jmethodID));
2747 return JVMTI_ERROR_NONE;
2748 }
2749 Klass* k = java_lang_Class::as_Klass(k_mirror);
2750 NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS);
2751
2752 // Return CLASS_NOT_PREPARED error as per JVMTI spec.
2753 if (!(k->jvmti_class_status() & (JVMTI_CLASS_STATUS_PREPARED|JVMTI_CLASS_STATUS_ARRAY) )) {
2754 return JVMTI_ERROR_CLASS_NOT_PREPARED;
2755 }
2756
2757 if (!k->is_instance_klass()) {
2758 *method_count_ptr = 0;
2759 *methods_ptr = (jmethodID*) jvmtiMalloc(0 * sizeof(jmethodID));
2760 return JVMTI_ERROR_NONE;
2761 }
2762 InstanceKlass* ik = InstanceKlass::cast(k);
2763 // Allocate the result and fill it in
2764 int result_length = ik->methods()->length();
2765 jmethodID* result_list = (jmethodID*)jvmtiMalloc(result_length * sizeof(jmethodID));
2766 int index;
2767 bool jmethodids_found = true;
2768 int skipped = 0; // skip overpass methods
2769
2770 for (index = 0; index < result_length; index++) {
2771 Method* m = ik->methods()->at(index);
2772 // Depending on can_maintain_original_method_order capability use the original
2773 // method ordering indices stored in the class, so we can emit jmethodIDs in
2774 // the order they appeared in the class file or just copy in current order.
2775 int result_index = JvmtiExport::can_maintain_original_method_order() ? ik->method_ordering()->at(index) : index;
2776 assert(result_index >= 0 && result_index < result_length, "invalid original method index");
2777 if (m->is_overpass()) {
2778 result_list[result_index] = nullptr;
2779 skipped++;
2780 continue;
2781 }
2782 jmethodID id;
2783 if (jmethodids_found) {
2784 id = m->find_jmethod_id_or_null();
2785 if (id == nullptr) {
2786 // If we find an uninitialized value, make sure there is
2787 // enough space for all the uninitialized values we might
2788 // find.
2789 ik->ensure_space_for_methodids(index);
2790 jmethodids_found = false;
2791 id = m->jmethod_id();
2792 }
2793 } else {
2794 id = m->jmethod_id();
2795 }
2796 result_list[result_index] = id;
2797 }
2798
2799 // Fill in return value.
2800 if (skipped > 0) {
2801 // copy results skipping null methodIDs
2802 *methods_ptr = (jmethodID*)jvmtiMalloc((result_length - skipped) * sizeof(jmethodID));
2803 *method_count_ptr = result_length - skipped;
2804 for (index = 0, skipped = 0; index < result_length; index++) {
2805 if (result_list[index] == nullptr) {
2806 skipped++;
2807 } else {
2808 (*methods_ptr)[index - skipped] = result_list[index];
2809 }
2810 }
2811 deallocate((unsigned char *)result_list);
2812 } else {
2813 *method_count_ptr = result_length;
2814 *methods_ptr = result_list;
2815 }
2816
2817 return JVMTI_ERROR_NONE;
2818 } /* end GetClassMethods */
2819
2820
2821 // k_mirror - may be primitive, this must be checked
2822 // field_count_ptr - pre-checked for null
2823 // fields_ptr - pre-checked for null
2824 jvmtiError
2825 JvmtiEnv::GetClassFields(oop k_mirror, jint* field_count_ptr, jfieldID** fields_ptr) {
2826 if (java_lang_Class::is_primitive(k_mirror)) {
2827 *field_count_ptr = 0;
2828 *fields_ptr = (jfieldID*) jvmtiMalloc(0 * sizeof(jfieldID));
2829 return JVMTI_ERROR_NONE;
2830 }
2831 JavaThread* current_thread = JavaThread::current();
2832 HandleMark hm(current_thread);
2833 Klass* k = java_lang_Class::as_Klass(k_mirror);
2834 NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS);
2835
2836 // Return CLASS_NOT_PREPARED error as per JVMTI spec.
2837 if (!(k->jvmti_class_status() & (JVMTI_CLASS_STATUS_PREPARED|JVMTI_CLASS_STATUS_ARRAY) )) {
2838 return JVMTI_ERROR_CLASS_NOT_PREPARED;
2839 }
2840
2841 if (!k->is_instance_klass()) {
2842 *field_count_ptr = 0;
2843 *fields_ptr = (jfieldID*) jvmtiMalloc(0 * sizeof(jfieldID));
2844 return JVMTI_ERROR_NONE;
2845 }
2846
2847 InstanceKlass* ik = InstanceKlass::cast(k);
2848
2849 FilteredJavaFieldStream flds(ik);
2850
2851 int result_count = flds.field_count();
2852
2853 // Allocate the result and fill it in.
2854 jfieldID* result_list = (jfieldID*)jvmtiMalloc(result_count * sizeof(jfieldID));
2855 for (int i = 0; i < result_count; i++, flds.next()) {
2856 result_list[i] = jfieldIDWorkaround::to_jfieldID(ik, flds.offset(),
2857 flds.access_flags().is_static(),
2858 flds.field_descriptor().is_flat());
2859 }
2860 assert(flds.done(), "just checking");
2861
2862 // Fill in the results
2863 *field_count_ptr = result_count;
2864 *fields_ptr = result_list;
2865
2866 return JVMTI_ERROR_NONE;
2867 } /* end GetClassFields */
2868
2869
2870 // k_mirror - may be primitive, this must be checked
2871 // interface_count_ptr - pre-checked for null
2872 // interfaces_ptr - pre-checked for null
2873 jvmtiError
2874 JvmtiEnv::GetImplementedInterfaces(oop k_mirror, jint* interface_count_ptr, jclass** interfaces_ptr) {
2875 {
2876 if (java_lang_Class::is_primitive(k_mirror)) {
2877 *interface_count_ptr = 0;
2878 *interfaces_ptr = (jclass*) jvmtiMalloc(0 * sizeof(jclass));
2879 return JVMTI_ERROR_NONE;
2880 }
2881 JavaThread* current_thread = JavaThread::current();
2882 HandleMark hm(current_thread);
2883 Klass* k = java_lang_Class::as_Klass(k_mirror);
2884 NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS);
2885
2886 // Return CLASS_NOT_PREPARED error as per JVMTI spec.
2887 if (!(k->jvmti_class_status() & (JVMTI_CLASS_STATUS_PREPARED|JVMTI_CLASS_STATUS_ARRAY) ))
2888 return JVMTI_ERROR_CLASS_NOT_PREPARED;
2889
2890 if (!k->is_instance_klass()) {
2891 *interface_count_ptr = 0;
2892 *interfaces_ptr = (jclass*) jvmtiMalloc(0 * sizeof(jclass));
2893 return JVMTI_ERROR_NONE;
2894 }
2895
2896 InstanceKlass* ik = InstanceKlass::cast(k);
2897 Array<InstanceKlass*>* interface_list = ik->local_interfaces();
2898 int result_length = (interface_list == nullptr ? 0 : interface_list->length());
2899 jclass* result_list = (jclass*) jvmtiMalloc(result_length * sizeof(jclass));
2900 for (int i_index = 0; i_index < result_length; i_index += 1) {
2901 InstanceKlass* klass_at = interface_list->at(i_index);
2902 assert(klass_at->is_klass(), "interfaces must be Klass*s");
2903 assert(klass_at->is_interface(), "interfaces must be interfaces");
2904 oop mirror_at = klass_at->java_mirror();
2905 Handle handle_at = Handle(current_thread, mirror_at);
2906 result_list[i_index] = (jclass) jni_reference(handle_at);
2907 }
2908 *interface_count_ptr = result_length;
2909 *interfaces_ptr = result_list;
2910 }
2911
2912 return JVMTI_ERROR_NONE;
2913 } /* end GetImplementedInterfaces */
2914
2915
2916 // k_mirror - may be primitive, this must be checked
2917 // minor_version_ptr - pre-checked for null
2918 // major_version_ptr - pre-checked for null
2919 jvmtiError
2920 JvmtiEnv::GetClassVersionNumbers(oop k_mirror, jint* minor_version_ptr, jint* major_version_ptr) {
2921 if (java_lang_Class::is_primitive(k_mirror)) {
2922 return JVMTI_ERROR_ABSENT_INFORMATION;
2923 }
2924 Klass* klass = java_lang_Class::as_Klass(k_mirror);
2925
2926 jint status = klass->jvmti_class_status();
2927 if (status & (JVMTI_CLASS_STATUS_ERROR)) {
2928 return JVMTI_ERROR_INVALID_CLASS;
2929 }
2930 if (status & (JVMTI_CLASS_STATUS_ARRAY)) {
2931 return JVMTI_ERROR_ABSENT_INFORMATION;
2932 }
2933
2934 InstanceKlass* ik = InstanceKlass::cast(klass);
2935 *minor_version_ptr = ik->minor_version();
2936 *major_version_ptr = ik->major_version();
2937
2938 return JVMTI_ERROR_NONE;
2939 } /* end GetClassVersionNumbers */
2940
2941
2942 // k_mirror - may be primitive, this must be checked
2943 // constant_pool_count_ptr - pre-checked for null
2944 // constant_pool_byte_count_ptr - pre-checked for null
2945 // constant_pool_bytes_ptr - pre-checked for null
2946 jvmtiError
2947 JvmtiEnv::GetConstantPool(oop k_mirror, jint* constant_pool_count_ptr, jint* constant_pool_byte_count_ptr, unsigned char** constant_pool_bytes_ptr) {
2948 if (java_lang_Class::is_primitive(k_mirror)) {
2949 return JVMTI_ERROR_ABSENT_INFORMATION;
2950 }
2951
2952 Klass* klass = java_lang_Class::as_Klass(k_mirror);
2953 Thread *thread = Thread::current();
2954 ResourceMark rm(thread);
2955
2956 jint status = klass->jvmti_class_status();
2957 if (status & (JVMTI_CLASS_STATUS_ERROR)) {
2958 return JVMTI_ERROR_INVALID_CLASS;
2959 }
2960 if (status & (JVMTI_CLASS_STATUS_ARRAY)) {
2961 return JVMTI_ERROR_ABSENT_INFORMATION;
2962 }
2963
2964 InstanceKlass* ik = InstanceKlass::cast(klass);
2965 JvmtiConstantPoolReconstituter reconstituter(ik);
2966 if (reconstituter.get_error() != JVMTI_ERROR_NONE) {
2967 return reconstituter.get_error();
2968 }
2969
2970 unsigned char *cpool_bytes;
2971 int cpool_size = reconstituter.cpool_size();
2972 if (reconstituter.get_error() != JVMTI_ERROR_NONE) {
2973 return reconstituter.get_error();
2974 }
2975 jvmtiError res = allocate(cpool_size, &cpool_bytes);
2976 if (res != JVMTI_ERROR_NONE) {
2977 return res;
2978 }
2979 reconstituter.copy_cpool_bytes(cpool_bytes);
2980 if (reconstituter.get_error() != JVMTI_ERROR_NONE) {
2981 return reconstituter.get_error();
2982 }
2983
2984 constantPoolHandle constants(thread, ik->constants());
2985 *constant_pool_count_ptr = constants->length();
2986 *constant_pool_byte_count_ptr = cpool_size;
2987 *constant_pool_bytes_ptr = cpool_bytes;
2988
2989 return JVMTI_ERROR_NONE;
2990 } /* end GetConstantPool */
2991
2992
2993 // k_mirror - may be primitive, this must be checked
2994 // is_interface_ptr - pre-checked for null
2995 jvmtiError
2996 JvmtiEnv::IsInterface(oop k_mirror, jboolean* is_interface_ptr) {
2997 {
2998 bool result = false;
2999 if (!java_lang_Class::is_primitive(k_mirror)) {
3000 Klass* k = java_lang_Class::as_Klass(k_mirror);
3001 if (k != nullptr && k->is_interface()) {
3002 result = true;
3003 }
3004 }
3005 *is_interface_ptr = result;
3006 }
3007
3008 return JVMTI_ERROR_NONE;
3009 } /* end IsInterface */
3010
3011
3012 // k_mirror - may be primitive, this must be checked
3013 // is_array_class_ptr - pre-checked for null
3014 jvmtiError
3015 JvmtiEnv::IsArrayClass(oop k_mirror, jboolean* is_array_class_ptr) {
3016 {
3017 bool result = false;
3018 if (!java_lang_Class::is_primitive(k_mirror)) {
3019 Klass* k = java_lang_Class::as_Klass(k_mirror);
3020 if (k != nullptr && k->is_array_klass()) {
3021 result = true;
3022 }
3023 }
3024 *is_array_class_ptr = result;
3025 }
3026
3027 return JVMTI_ERROR_NONE;
3028 } /* end IsArrayClass */
3029
3030
3031 // k_mirror - may be primitive, this must be checked
3032 // classloader_ptr - pre-checked for null
3033 jvmtiError
3034 JvmtiEnv::GetClassLoader(oop k_mirror, jobject* classloader_ptr) {
3035 {
3036 if (java_lang_Class::is_primitive(k_mirror)) {
3037 *classloader_ptr = (jclass) jni_reference(Handle());
3038 return JVMTI_ERROR_NONE;
3039 }
3040 JavaThread* current_thread = JavaThread::current();
3041 HandleMark hm(current_thread);
3042 Klass* k = java_lang_Class::as_Klass(k_mirror);
3043 NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS);
3044
3045 oop result_oop = k->class_loader();
3046 if (result_oop == nullptr) {
3047 *classloader_ptr = (jclass) jni_reference(Handle());
3048 return JVMTI_ERROR_NONE;
3049 }
3050 Handle result_handle = Handle(current_thread, result_oop);
3051 jclass result_jnihandle = (jclass) jni_reference(result_handle);
3052 *classloader_ptr = result_jnihandle;
3053 }
3054 return JVMTI_ERROR_NONE;
3055 } /* end GetClassLoader */
3056
3057
3058 // k_mirror - may be primitive, this must be checked
3059 // source_debug_extension_ptr - pre-checked for null
3060 jvmtiError
3061 JvmtiEnv::GetSourceDebugExtension(oop k_mirror, char** source_debug_extension_ptr) {
3062 {
3063 if (java_lang_Class::is_primitive(k_mirror)) {
3064 return JVMTI_ERROR_ABSENT_INFORMATION;
3065 }
3066 Klass* k = java_lang_Class::as_Klass(k_mirror);
3067 NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS);
3068 if (!k->is_instance_klass()) {
3069 return JVMTI_ERROR_ABSENT_INFORMATION;
3070 }
3071 const char* sde = InstanceKlass::cast(k)->source_debug_extension();
3072 NULL_CHECK(sde, JVMTI_ERROR_ABSENT_INFORMATION);
3073
3074 {
3075 *source_debug_extension_ptr = (char *) jvmtiMalloc(strlen(sde)+1);
3076 strcpy(*source_debug_extension_ptr, sde);
3077 }
3078 }
3079
3080 return JVMTI_ERROR_NONE;
3081 } /* end GetSourceDebugExtension */
3082
3083 //
3084 // Object functions
3085 //
3086
3087 // hash_code_ptr - pre-checked for null
3088 jvmtiError
3089 JvmtiEnv::GetObjectHashCode(jobject object, jint* hash_code_ptr) {
3090 oop mirror = JNIHandles::resolve_external_guard(object);
3091 NULL_CHECK(mirror, JVMTI_ERROR_INVALID_OBJECT);
3092 NULL_CHECK(hash_code_ptr, JVMTI_ERROR_NULL_POINTER);
3093
3094 if (mirror->is_inline_type()) {
3095 // For inline types, use the klass as a hash code.
3096 // TBD to improve this (see also JvmtiTagMapKey::get_hash for similar case).
3097 *hash_code_ptr = (jint)((int64_t)mirror->klass() >> 3);
3098 } else {
3099 *hash_code_ptr = (jint)mirror->identity_hash();
3100 }
3101 return JVMTI_ERROR_NONE;
3102 } /* end GetObjectHashCode */
3103
3104
3105 // info_ptr - pre-checked for null
3106 jvmtiError
3107 JvmtiEnv::GetObjectMonitorUsage(jobject object, jvmtiMonitorUsage* info_ptr) {
3108 // This needs to be performed at a safepoint to gather stable data
3109 // because monitor owner / waiters might not be suspended.
3110 VM_GetObjectMonitorUsage op(this, JavaThread::current(), object, info_ptr);
3111 VMThread::execute(&op);
3112 return op.result();
3113 } /* end GetObjectMonitorUsage */
3114
3115
3116 //
3117 // Field functions
3118 //
3119
3120 // name_ptr - null is a valid value, must be checked
3121 // signature_ptr - null is a valid value, must be checked
3122 // generic_ptr - null is a valid value, must be checked
3123 jvmtiError
3124 JvmtiEnv::GetFieldName(fieldDescriptor* fdesc_ptr, char** name_ptr, char** signature_ptr, char** generic_ptr) {
3125 JavaThread* current_thread = JavaThread::current();
3126 ResourceMark rm(current_thread);
3127 if (name_ptr == nullptr) {
3128 // just don't return the name
3129 } else {
3130 const char* fieldName = fdesc_ptr->name()->as_C_string();
3131 *name_ptr = (char*) jvmtiMalloc(strlen(fieldName) + 1);
3132 if (*name_ptr == nullptr)
3133 return JVMTI_ERROR_OUT_OF_MEMORY;
3134 strcpy(*name_ptr, fieldName);
3135 }
3136 if (signature_ptr== nullptr) {
3137 // just don't return the signature
3138 } else {
3139 const char* fieldSignature = fdesc_ptr->signature()->as_C_string();
3140 *signature_ptr = (char*) jvmtiMalloc(strlen(fieldSignature) + 1);
3141 if (*signature_ptr == nullptr)
3142 return JVMTI_ERROR_OUT_OF_MEMORY;
3143 strcpy(*signature_ptr, fieldSignature);
3144 }
3145 if (generic_ptr != nullptr) {
3146 *generic_ptr = nullptr;
3147 Symbol* soop = fdesc_ptr->generic_signature();
3148 if (soop != nullptr) {
3149 const char* gen_sig = soop->as_C_string();
3150 if (gen_sig != nullptr) {
3151 jvmtiError err = allocate(strlen(gen_sig) + 1, (unsigned char **)generic_ptr);
3152 if (err != JVMTI_ERROR_NONE) {
3153 return err;
3154 }
3155 strcpy(*generic_ptr, gen_sig);
3156 }
3157 }
3158 }
3159 return JVMTI_ERROR_NONE;
3160 } /* end GetFieldName */
3161
3162
3163 // declaring_class_ptr - pre-checked for null
3164 jvmtiError
3165 JvmtiEnv::GetFieldDeclaringClass(fieldDescriptor* fdesc_ptr, jclass* declaring_class_ptr) {
3166 // As for the GetFieldDeclaringClass method, the XSL generated C++ code that calls it has
3167 // a jclass of the relevant class or a subclass of it, which is fine in terms of ensuring
3168 // the holder is kept alive.
3169 *declaring_class_ptr = get_jni_class_non_null(fdesc_ptr->field_holder());
3170 return JVMTI_ERROR_NONE;
3171 } /* end GetFieldDeclaringClass */
3172
3173
3174 // modifiers_ptr - pre-checked for null
3175 jvmtiError
3176 JvmtiEnv::GetFieldModifiers(fieldDescriptor* fdesc_ptr, jint* modifiers_ptr) {
3177
3178 AccessFlags resultFlags = fdesc_ptr->access_flags();
3179 jint result = resultFlags.as_field_flags();
3180 *modifiers_ptr = result;
3181
3182 return JVMTI_ERROR_NONE;
3183 } /* end GetFieldModifiers */
3184
3185
3186 // is_synthetic_ptr - pre-checked for null
3187 jvmtiError
3188 JvmtiEnv::IsFieldSynthetic(fieldDescriptor* fdesc_ptr, jboolean* is_synthetic_ptr) {
3189 *is_synthetic_ptr = fdesc_ptr->is_synthetic();
3190 return JVMTI_ERROR_NONE;
3191 } /* end IsFieldSynthetic */
3192
3193
3194 //
3195 // Method functions
3196 //
3197
3198 // method - pre-checked for validity, but may be null meaning obsolete method
3199 // name_ptr - null is a valid value, must be checked
3200 // signature_ptr - null is a valid value, must be checked
3201 // generic_ptr - null is a valid value, must be checked
3202 jvmtiError
3203 JvmtiEnv::GetMethodName(Method* method, char** name_ptr, char** signature_ptr, char** generic_ptr) {
3204 NULL_CHECK(method, JVMTI_ERROR_INVALID_METHODID);
3205 JavaThread* current_thread = JavaThread::current();
3206
3207 ResourceMark rm(current_thread); // get the utf8 name and signature
3208 if (name_ptr == nullptr) {
3209 // just don't return the name
3210 } else {
3211 const char* utf8_name = (const char *) method->name()->as_utf8();
3212 *name_ptr = (char *) jvmtiMalloc(strlen(utf8_name)+1);
3213 strcpy(*name_ptr, utf8_name);
3214 }
3215 if (signature_ptr == nullptr) {
3216 // just don't return the signature
3217 } else {
3218 const char* utf8_signature = (const char *) method->signature()->as_utf8();
3219 *signature_ptr = (char *) jvmtiMalloc(strlen(utf8_signature) + 1);
3220 strcpy(*signature_ptr, utf8_signature);
3221 }
3222
3223 if (generic_ptr != nullptr) {
3224 *generic_ptr = nullptr;
3225 Symbol* soop = method->generic_signature();
3226 if (soop != nullptr) {
3227 const char* gen_sig = soop->as_C_string();
3228 if (gen_sig != nullptr) {
3229 jvmtiError err = allocate(strlen(gen_sig) + 1, (unsigned char **)generic_ptr);
3230 if (err != JVMTI_ERROR_NONE) {
3231 return err;
3232 }
3233 strcpy(*generic_ptr, gen_sig);
3234 }
3235 }
3236 }
3237 return JVMTI_ERROR_NONE;
3238 } /* end GetMethodName */
3239
3240
3241 // method - pre-checked for validity, but may be null meaning obsolete method
3242 // declaring_class_ptr - pre-checked for null
3243 jvmtiError
3244 JvmtiEnv::GetMethodDeclaringClass(Method* method, jclass* declaring_class_ptr) {
3245 NULL_CHECK(method, JVMTI_ERROR_INVALID_METHODID);
3246 Klass* k = method->method_holder();
3247 Handle holder(Thread::current(), k->klass_holder()); // keep the klass alive
3248 (*declaring_class_ptr) = get_jni_class_non_null(k);
3249 return JVMTI_ERROR_NONE;
3250 } /* end GetMethodDeclaringClass */
3251
3252
3253 // method - pre-checked for validity, but may be null meaning obsolete method
3254 // modifiers_ptr - pre-checked for null
3255 jvmtiError
3256 JvmtiEnv::GetMethodModifiers(Method* method, jint* modifiers_ptr) {
3257 NULL_CHECK(method, JVMTI_ERROR_INVALID_METHODID);
3258 (*modifiers_ptr) = method->access_flags().as_method_flags();
3259 return JVMTI_ERROR_NONE;
3260 } /* end GetMethodModifiers */
3261
3262
3263 // method - pre-checked for validity, but may be null meaning obsolete method
3264 // max_ptr - pre-checked for null
3265 jvmtiError
3266 JvmtiEnv::GetMaxLocals(Method* method, jint* max_ptr) {
3267 NULL_CHECK(method, JVMTI_ERROR_INVALID_METHODID);
3268 // get max stack
3269 (*max_ptr) = method->max_locals();
3270 return JVMTI_ERROR_NONE;
3271 } /* end GetMaxLocals */
3272
3273
3274 // method - pre-checked for validity, but may be null meaning obsolete method
3275 // size_ptr - pre-checked for null
3276 jvmtiError
3277 JvmtiEnv::GetArgumentsSize(Method* method, jint* size_ptr) {
3278 NULL_CHECK(method, JVMTI_ERROR_INVALID_METHODID);
3279 // get size of arguments
3280
3281 (*size_ptr) = method->size_of_parameters();
3282 return JVMTI_ERROR_NONE;
3283 } /* end GetArgumentsSize */
3284
3285
3286 // method - pre-checked for validity, but may be null meaning obsolete method
3287 // entry_count_ptr - pre-checked for null
3288 // table_ptr - pre-checked for null
3289 jvmtiError
3290 JvmtiEnv::GetLineNumberTable(Method* method, jint* entry_count_ptr, jvmtiLineNumberEntry** table_ptr) {
3291 NULL_CHECK(method, JVMTI_ERROR_INVALID_METHODID);
3292 if (!method->has_linenumber_table()) {
3293 return (JVMTI_ERROR_ABSENT_INFORMATION);
3294 }
3295
3296 // The line number table is compressed so we don't know how big it is until decompressed.
3297 // Decompression is really fast so we just do it twice.
3298
3299 // Compute size of table
3300 jint num_entries = 0;
3301 CompressedLineNumberReadStream stream(method->compressed_linenumber_table());
3302 while (stream.read_pair()) {
3303 num_entries++;
3304 }
3305 jvmtiLineNumberEntry *jvmti_table =
3306 (jvmtiLineNumberEntry *)jvmtiMalloc(num_entries * (sizeof(jvmtiLineNumberEntry)));
3307
3308 // Fill jvmti table
3309 if (num_entries > 0) {
3310 int index = 0;
3311 CompressedLineNumberReadStream stream(method->compressed_linenumber_table());
3312 while (stream.read_pair()) {
3313 jvmti_table[index].start_location = (jlocation) stream.bci();
3314 jvmti_table[index].line_number = (jint) stream.line();
3315 index++;
3316 }
3317 assert(index == num_entries, "sanity check");
3318 }
3319
3320 // Set up results
3321 (*entry_count_ptr) = num_entries;
3322 (*table_ptr) = jvmti_table;
3323
3324 return JVMTI_ERROR_NONE;
3325 } /* end GetLineNumberTable */
3326
3327
3328 // method - pre-checked for validity, but may be null meaning obsolete method
3329 // start_location_ptr - pre-checked for null
3330 // end_location_ptr - pre-checked for null
3331 jvmtiError
3332 JvmtiEnv::GetMethodLocation(Method* method, jlocation* start_location_ptr, jlocation* end_location_ptr) {
3333
3334 NULL_CHECK(method, JVMTI_ERROR_INVALID_METHODID);
3335 // get start and end location
3336 (*end_location_ptr) = (jlocation) (method->code_size() - 1);
3337 if (method->code_size() == 0) {
3338 // there is no code so there is no start location
3339 (*start_location_ptr) = (jlocation)(-1);
3340 } else {
3341 (*start_location_ptr) = (jlocation)(0);
3342 }
3343
3344 return JVMTI_ERROR_NONE;
3345 } /* end GetMethodLocation */
3346
3347
3348 // method - pre-checked for validity, but may be null meaning obsolete method
3349 // entry_count_ptr - pre-checked for null
3350 // table_ptr - pre-checked for null
3351 jvmtiError
3352 JvmtiEnv::GetLocalVariableTable(Method* method, jint* entry_count_ptr, jvmtiLocalVariableEntry** table_ptr) {
3353
3354 NULL_CHECK(method, JVMTI_ERROR_INVALID_METHODID);
3355 JavaThread* current_thread = JavaThread::current();
3356
3357 // does the klass have any local variable information?
3358 InstanceKlass* ik = method->method_holder();
3359 if (!ik->has_localvariable_table()) {
3360 return (JVMTI_ERROR_ABSENT_INFORMATION);
3361 }
3362
3363 ConstantPool* constants = method->constants();
3364 NULL_CHECK(constants, JVMTI_ERROR_ABSENT_INFORMATION);
3365
3366 // in the vm localvariable table representation, 6 consecutive elements in the table
3367 // represent a 6-tuple of shorts
3368 // [start_pc, length, name_index, descriptor_index, signature_index, index]
3369 jint num_entries = method->localvariable_table_length();
3370 jvmtiLocalVariableEntry *jvmti_table = (jvmtiLocalVariableEntry *)
3371 jvmtiMalloc(num_entries * (sizeof(jvmtiLocalVariableEntry)));
3372
3373 if (num_entries > 0) {
3374 LocalVariableTableElement* table = method->localvariable_table_start();
3375 for (int i = 0; i < num_entries; i++) {
3376 // get the 5 tuple information from the vm table
3377 jlocation start_location = (jlocation) table[i].start_bci;
3378 jint length = (jint) table[i].length;
3379 int name_index = (int) table[i].name_cp_index;
3380 int signature_index = (int) table[i].descriptor_cp_index;
3381 int generic_signature_index = (int) table[i].signature_cp_index;
3382 jint slot = (jint) table[i].slot;
3383
3384 // get utf8 name and signature
3385 char *name_buf = nullptr;
3386 char *sig_buf = nullptr;
3387 char *gen_sig_buf = nullptr;
3388 {
3389 ResourceMark rm(current_thread);
3390
3391 const char *utf8_name = (const char *) constants->symbol_at(name_index)->as_utf8();
3392 name_buf = (char *) jvmtiMalloc(strlen(utf8_name)+1);
3393 strcpy(name_buf, utf8_name);
3394
3395 const char *utf8_signature = (const char *) constants->symbol_at(signature_index)->as_utf8();
3396 sig_buf = (char *) jvmtiMalloc(strlen(utf8_signature)+1);
3397 strcpy(sig_buf, utf8_signature);
3398
3399 if (generic_signature_index > 0) {
3400 const char *utf8_gen_sign = (const char *)
3401 constants->symbol_at(generic_signature_index)->as_utf8();
3402 gen_sig_buf = (char *) jvmtiMalloc(strlen(utf8_gen_sign)+1);
3403 strcpy(gen_sig_buf, utf8_gen_sign);
3404 }
3405 }
3406
3407 // fill in the jvmti local variable table
3408 jvmti_table[i].start_location = start_location;
3409 jvmti_table[i].length = length;
3410 jvmti_table[i].name = name_buf;
3411 jvmti_table[i].signature = sig_buf;
3412 jvmti_table[i].generic_signature = gen_sig_buf;
3413 jvmti_table[i].slot = slot;
3414 }
3415 }
3416
3417 // set results
3418 (*entry_count_ptr) = num_entries;
3419 (*table_ptr) = jvmti_table;
3420
3421 return JVMTI_ERROR_NONE;
3422 } /* end GetLocalVariableTable */
3423
3424
3425 // method - pre-checked for validity, but may be null meaning obsolete method
3426 // bytecode_count_ptr - pre-checked for null
3427 // bytecodes_ptr - pre-checked for null
3428 jvmtiError
3429 JvmtiEnv::GetBytecodes(Method* method, jint* bytecode_count_ptr, unsigned char** bytecodes_ptr) {
3430 NULL_CHECK(method, JVMTI_ERROR_INVALID_METHODID);
3431
3432 methodHandle mh(Thread::current(), method);
3433 jint size = (jint)mh->code_size();
3434 jvmtiError err = allocate(size, bytecodes_ptr);
3435 if (err != JVMTI_ERROR_NONE) {
3436 return err;
3437 }
3438
3439 (*bytecode_count_ptr) = size;
3440 // get byte codes
3441 JvmtiClassFileReconstituter::copy_bytecodes(mh, *bytecodes_ptr);
3442
3443 return JVMTI_ERROR_NONE;
3444 } /* end GetBytecodes */
3445
3446
3447 // method - pre-checked for validity, but may be null meaning obsolete method
3448 // is_native_ptr - pre-checked for null
3449 jvmtiError
3450 JvmtiEnv::IsMethodNative(Method* method, jboolean* is_native_ptr) {
3451 NULL_CHECK(method, JVMTI_ERROR_INVALID_METHODID);
3452 (*is_native_ptr) = method->is_native();
3453 return JVMTI_ERROR_NONE;
3454 } /* end IsMethodNative */
3455
3456
3457 // method - pre-checked for validity, but may be null meaning obsolete method
3458 // is_synthetic_ptr - pre-checked for null
3459 jvmtiError
3460 JvmtiEnv::IsMethodSynthetic(Method* method, jboolean* is_synthetic_ptr) {
3461 NULL_CHECK(method, JVMTI_ERROR_INVALID_METHODID);
3462 (*is_synthetic_ptr) = method->is_synthetic();
3463 return JVMTI_ERROR_NONE;
3464 } /* end IsMethodSynthetic */
3465
3466
3467 // method - pre-checked for validity, but may be null meaning obsolete method
3468 // is_obsolete_ptr - pre-checked for null
3469 jvmtiError
3470 JvmtiEnv::IsMethodObsolete(Method* method, jboolean* is_obsolete_ptr) {
3471 if (use_version_1_0_semantics() &&
3472 get_capabilities()->can_redefine_classes == 0) {
3473 // This JvmtiEnv requested version 1.0 semantics and this function
3474 // requires the can_redefine_classes capability in version 1.0 so
3475 // we need to return an error here.
3476 return JVMTI_ERROR_MUST_POSSESS_CAPABILITY;
3477 }
3478
3479 if (method == nullptr || method->is_obsolete()) {
3480 *is_obsolete_ptr = true;
3481 } else {
3482 *is_obsolete_ptr = false;
3483 }
3484 return JVMTI_ERROR_NONE;
3485 } /* end IsMethodObsolete */
3486
3487 //
3488 // Raw Monitor functions
3489 //
3490
3491 // name - pre-checked for null
3492 // monitor_ptr - pre-checked for null
3493 jvmtiError
3494 JvmtiEnv::CreateRawMonitor(const char* name, jrawMonitorID* monitor_ptr) {
3495 JvmtiRawMonitor* rmonitor = new (std::nothrow) JvmtiRawMonitor(name);
3496 NULL_CHECK(rmonitor, JVMTI_ERROR_OUT_OF_MEMORY);
3497
3498 *monitor_ptr = (jrawMonitorID)rmonitor;
3499
3500 return JVMTI_ERROR_NONE;
3501 } /* end CreateRawMonitor */
3502
3503
3504 // rmonitor - pre-checked for validity
3505 jvmtiError
3506 JvmtiEnv::DestroyRawMonitor(JvmtiRawMonitor * rmonitor) {
3507 if (Threads::number_of_threads() == 0) {
3508 // Remove this monitor from pending raw monitors list
3509 // if it has entered in onload or start phase.
3510 JvmtiPendingMonitors::destroy(rmonitor);
3511 } else {
3512 Thread* thread = Thread::current();
3513 if (rmonitor->owner() == thread) {
3514 // The caller owns this monitor which we are about to destroy.
3515 // We exit the underlying synchronization object so that the
3516 // "delete monitor" call below can work without an assertion
3517 // failure on systems that don't like destroying synchronization
3518 // objects that are locked.
3519 int r;
3520 int recursion = rmonitor->recursions();
3521 for (int i = 0; i <= recursion; i++) {
3522 r = rmonitor->raw_exit(thread);
3523 assert(r == JvmtiRawMonitor::M_OK, "raw_exit should have worked");
3524 if (r != JvmtiRawMonitor::M_OK) { // robustness
3525 return JVMTI_ERROR_INTERNAL;
3526 }
3527 }
3528 }
3529 if (rmonitor->owner() != nullptr) {
3530 // The caller is trying to destroy a monitor that is locked by
3531 // someone else. While this is not forbidden by the JVMTI
3532 // spec, it will cause an assertion failure on systems that don't
3533 // like destroying synchronization objects that are locked.
3534 // We indicate a problem with the error return (and leak the
3535 // monitor's memory).
3536 return JVMTI_ERROR_NOT_MONITOR_OWNER;
3537 }
3538 }
3539
3540 delete rmonitor;
3541
3542 return JVMTI_ERROR_NONE;
3543 } /* end DestroyRawMonitor */
3544
3545
3546 // rmonitor - pre-checked for validity
3547 jvmtiError
3548 JvmtiEnv::RawMonitorEnter(JvmtiRawMonitor * rmonitor) {
3549 if (Threads::number_of_threads() == 0) {
3550 // No JavaThreads exist so JvmtiRawMonitor enter cannot be
3551 // used, add this raw monitor to the pending list.
3552 // The pending monitors will be actually entered when
3553 // the VM is setup.
3554 // See transition_pending_raw_monitors in create_vm()
3555 // in thread.cpp.
3556 JvmtiPendingMonitors::enter(rmonitor);
3557 } else {
3558 Thread* thread = Thread::current();
3559 // 8266889: raw_enter changes Java thread state, needs WXWrite
3560 MACOS_AARCH64_ONLY(ThreadWXEnable __wx(WXWrite, thread));
3561 rmonitor->raw_enter(thread);
3562 }
3563 return JVMTI_ERROR_NONE;
3564 } /* end RawMonitorEnter */
3565
3566
3567 // rmonitor - pre-checked for validity
3568 jvmtiError
3569 JvmtiEnv::RawMonitorExit(JvmtiRawMonitor * rmonitor) {
3570 jvmtiError err = JVMTI_ERROR_NONE;
3571
3572 if (Threads::number_of_threads() == 0) {
3573 // No JavaThreads exist so just remove this monitor from the pending list.
3574 // Bool value from exit is false if rmonitor is not in the list.
3575 if (!JvmtiPendingMonitors::exit(rmonitor)) {
3576 err = JVMTI_ERROR_NOT_MONITOR_OWNER;
3577 }
3578 } else {
3579 Thread* thread = Thread::current();
3580 int r = rmonitor->raw_exit(thread);
3581 if (r == JvmtiRawMonitor::M_ILLEGAL_MONITOR_STATE) {
3582 err = JVMTI_ERROR_NOT_MONITOR_OWNER;
3583 }
3584 }
3585 return err;
3586 } /* end RawMonitorExit */
3587
3588
3589 // rmonitor - pre-checked for validity
3590 jvmtiError
3591 JvmtiEnv::RawMonitorWait(JvmtiRawMonitor * rmonitor, jlong millis) {
3592 Thread* thread = Thread::current();
3593 // 8266889: raw_wait changes Java thread state, needs WXWrite
3594 MACOS_AARCH64_ONLY(ThreadWXEnable __wx(WXWrite, thread));
3595 int r = rmonitor->raw_wait(millis, thread);
3596
3597 switch (r) {
3598 case JvmtiRawMonitor::M_INTERRUPTED:
3599 return JVMTI_ERROR_INTERRUPT;
3600 case JvmtiRawMonitor::M_ILLEGAL_MONITOR_STATE:
3601 return JVMTI_ERROR_NOT_MONITOR_OWNER;
3602 default:
3603 return JVMTI_ERROR_NONE;
3604 }
3605 } /* end RawMonitorWait */
3606
3607
3608 // rmonitor - pre-checked for validity
3609 jvmtiError
3610 JvmtiEnv::RawMonitorNotify(JvmtiRawMonitor * rmonitor) {
3611 Thread* thread = Thread::current();
3612 int r = rmonitor->raw_notify(thread);
3613
3614 if (r == JvmtiRawMonitor::M_ILLEGAL_MONITOR_STATE) {
3615 return JVMTI_ERROR_NOT_MONITOR_OWNER;
3616 }
3617 return JVMTI_ERROR_NONE;
3618 } /* end RawMonitorNotify */
3619
3620
3621 // rmonitor - pre-checked for validity
3622 jvmtiError
3623 JvmtiEnv::RawMonitorNotifyAll(JvmtiRawMonitor * rmonitor) {
3624 Thread* thread = Thread::current();
3625 int r = rmonitor->raw_notifyAll(thread);
3626
3627 if (r == JvmtiRawMonitor::M_ILLEGAL_MONITOR_STATE) {
3628 return JVMTI_ERROR_NOT_MONITOR_OWNER;
3629 }
3630 return JVMTI_ERROR_NONE;
3631 } /* end RawMonitorNotifyAll */
3632
3633
3634 //
3635 // JNI Function Interception functions
3636 //
3637
3638
3639 // function_table - pre-checked for null
3640 jvmtiError
3641 JvmtiEnv::SetJNIFunctionTable(const jniNativeInterface* function_table) {
3642 // Copy jni function table at safepoint.
3643 VM_JNIFunctionTableCopier copier(function_table);
3644 VMThread::execute(&copier);
3645
3646 return JVMTI_ERROR_NONE;
3647 } /* end SetJNIFunctionTable */
3648
3649
3650 // function_table - pre-checked for null
3651 jvmtiError
3652 JvmtiEnv::GetJNIFunctionTable(jniNativeInterface** function_table) {
3653 *function_table=(jniNativeInterface*)jvmtiMalloc(sizeof(jniNativeInterface));
3654 if (*function_table == nullptr)
3655 return JVMTI_ERROR_OUT_OF_MEMORY;
3656 memcpy(*function_table,(JavaThread::current())->get_jni_functions(),sizeof(jniNativeInterface));
3657 return JVMTI_ERROR_NONE;
3658 } /* end GetJNIFunctionTable */
3659
3660
3661 //
3662 // Event Management functions
3663 //
3664
3665 jvmtiError
3666 JvmtiEnv::GenerateEvents(jvmtiEvent event_type) {
3667 // can only generate two event types
3668 if (event_type != JVMTI_EVENT_COMPILED_METHOD_LOAD &&
3669 event_type != JVMTI_EVENT_DYNAMIC_CODE_GENERATED) {
3670 return JVMTI_ERROR_ILLEGAL_ARGUMENT;
3671 }
3672
3673 // for compiled_method_load events we must check that the environment
3674 // has the can_generate_compiled_method_load_events capability.
3675 if (event_type == JVMTI_EVENT_COMPILED_METHOD_LOAD) {
3676 if (get_capabilities()->can_generate_compiled_method_load_events == 0) {
3677 return JVMTI_ERROR_MUST_POSSESS_CAPABILITY;
3678 }
3679 return JvmtiCodeBlobEvents::generate_compiled_method_load_events(this);
3680 } else {
3681 return JvmtiCodeBlobEvents::generate_dynamic_code_events(this);
3682 }
3683
3684 } /* end GenerateEvents */
3685
3686
3687 //
3688 // Extension Mechanism functions
3689 //
3690
3691 // extension_count_ptr - pre-checked for null
3692 // extensions - pre-checked for null
3693 jvmtiError
3694 JvmtiEnv::GetExtensionFunctions(jint* extension_count_ptr, jvmtiExtensionFunctionInfo** extensions) {
3695 return JvmtiExtensions::get_functions(this, extension_count_ptr, extensions);
3696 } /* end GetExtensionFunctions */
3697
3698
3699 // extension_count_ptr - pre-checked for null
3700 // extensions - pre-checked for null
3701 jvmtiError
3702 JvmtiEnv::GetExtensionEvents(jint* extension_count_ptr, jvmtiExtensionEventInfo** extensions) {
3703 return JvmtiExtensions::get_events(this, extension_count_ptr, extensions);
3704 } /* end GetExtensionEvents */
3705
3706
3707 // callback - null is a valid value, must be checked
3708 jvmtiError
3709 JvmtiEnv::SetExtensionEventCallback(jint extension_event_index, jvmtiExtensionEvent callback) {
3710 return JvmtiExtensions::set_event_callback(this, extension_event_index, callback);
3711 } /* end SetExtensionEventCallback */
3712
3713 //
3714 // Timers functions
3715 //
3716
3717 // info_ptr - pre-checked for null
3718 jvmtiError
3719 JvmtiEnv::GetCurrentThreadCpuTimerInfo(jvmtiTimerInfo* info_ptr) {
3720 os::current_thread_cpu_time_info(info_ptr);
3721 return JVMTI_ERROR_NONE;
3722 } /* end GetCurrentThreadCpuTimerInfo */
3723
3724
3725 // nanos_ptr - pre-checked for null
3726 jvmtiError
3727 JvmtiEnv::GetCurrentThreadCpuTime(jlong* nanos_ptr) {
3728 Thread* thread = Thread::current();
3729
3730 // Surprisingly the GetCurrentThreadCpuTime is used by non-JavaThread's.
3731 if (thread->is_Java_thread()) {
3732 if (JavaThread::cast(thread)->is_vthread_mounted()) {
3733 // No support for a VirtualThread (yet).
3734 return JVMTI_ERROR_UNSUPPORTED_OPERATION;
3735 }
3736 }
3737 *nanos_ptr = os::current_thread_cpu_time();
3738 return JVMTI_ERROR_NONE;
3739 } /* end GetCurrentThreadCpuTime */
3740
3741
3742 // info_ptr - pre-checked for null
3743 jvmtiError
3744 JvmtiEnv::GetThreadCpuTimerInfo(jvmtiTimerInfo* info_ptr) {
3745 os::thread_cpu_time_info(info_ptr);
3746 return JVMTI_ERROR_NONE;
3747 } /* end GetThreadCpuTimerInfo */
3748
3749
3750 // nanos_ptr - pre-checked for null
3751 jvmtiError
3752 JvmtiEnv::GetThreadCpuTime(jthread thread, jlong* nanos_ptr) {
3753 JavaThread* current_thread = JavaThread::current();
3754 ThreadsListHandle tlh(current_thread);
3755 JavaThread* java_thread = nullptr;
3756 oop thread_oop = nullptr;
3757
3758 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, current_thread, &java_thread, &thread_oop);
3759
3760 if (thread_oop != nullptr && thread_oop->is_a(vmClasses::BaseVirtualThread_klass())) {
3761 // No support for virtual threads (yet).
3762 return JVMTI_ERROR_UNSUPPORTED_OPERATION;
3763 }
3764 if (err != JVMTI_ERROR_NONE) {
3765 return err;
3766 }
3767 NULL_CHECK(nanos_ptr, JVMTI_ERROR_NULL_POINTER);
3768
3769 *nanos_ptr = os::thread_cpu_time(java_thread);
3770 return JVMTI_ERROR_NONE;
3771 } /* end GetThreadCpuTime */
3772
3773
3774 // info_ptr - pre-checked for null
3775 jvmtiError
3776 JvmtiEnv::GetTimerInfo(jvmtiTimerInfo* info_ptr) {
3777 os::javaTimeNanos_info(info_ptr);
3778 return JVMTI_ERROR_NONE;
3779 } /* end GetTimerInfo */
3780
3781
3782 // nanos_ptr - pre-checked for null
3783 jvmtiError
3784 JvmtiEnv::GetTime(jlong* nanos_ptr) {
3785 *nanos_ptr = os::javaTimeNanos();
3786 return JVMTI_ERROR_NONE;
3787 } /* end GetTime */
3788
3789
3790 // processor_count_ptr - pre-checked for null
3791 jvmtiError
3792 JvmtiEnv::GetAvailableProcessors(jint* processor_count_ptr) {
3793 *processor_count_ptr = os::active_processor_count();
3794 return JVMTI_ERROR_NONE;
3795 } /* end GetAvailableProcessors */
3796
3797 jvmtiError
3798 JvmtiEnv::SetHeapSamplingInterval(jint sampling_interval) {
3799 if (sampling_interval < 0) {
3800 return JVMTI_ERROR_ILLEGAL_ARGUMENT;
3801 }
3802 ThreadHeapSampler::set_sampling_interval(sampling_interval);
3803 return JVMTI_ERROR_NONE;
3804 } /* end SetHeapSamplingInterval */
3805
3806 //
3807 // System Properties functions
3808 //
3809
3810 // count_ptr - pre-checked for null
3811 // property_ptr - pre-checked for null
3812 jvmtiError
3813 JvmtiEnv::GetSystemProperties(jint* count_ptr, char*** property_ptr) {
3814 jvmtiError err = JVMTI_ERROR_NONE;
3815
3816 // Get the number of readable properties.
3817 *count_ptr = Arguments::PropertyList_readable_count(Arguments::system_properties());
3818
3819 // Allocate memory to hold the exact number of readable properties.
3820 err = allocate(*count_ptr * sizeof(char *), (unsigned char **)property_ptr);
3821 if (err != JVMTI_ERROR_NONE) {
3822 return err;
3823 }
3824 int readable_count = 0;
3825 // Loop through the system properties until all the readable properties are found.
3826 for (SystemProperty* p = Arguments::system_properties(); p != nullptr && readable_count < *count_ptr; p = p->next()) {
3827 if (p->readable()) {
3828 const char *key = p->key();
3829 char **tmp_value = *property_ptr+readable_count;
3830 readable_count++;
3831 err = allocate((strlen(key)+1) * sizeof(char), (unsigned char**)tmp_value);
3832 if (err == JVMTI_ERROR_NONE) {
3833 strcpy(*tmp_value, key);
3834 } else {
3835 // clean up previously allocated memory.
3836 for (int j = 0; j < readable_count; j++) {
3837 Deallocate((unsigned char*)*property_ptr+j);
3838 }
3839 Deallocate((unsigned char*)property_ptr);
3840 break;
3841 }
3842 }
3843 }
3844 assert(err != JVMTI_ERROR_NONE || readable_count == *count_ptr, "Bad readable property count");
3845 return err;
3846 } /* end GetSystemProperties */
3847
3848
3849 // property - pre-checked for null
3850 // value_ptr - pre-checked for null
3851 jvmtiError
3852 JvmtiEnv::GetSystemProperty(const char* property, char** value_ptr) {
3853 jvmtiError err = JVMTI_ERROR_NONE;
3854 const char *value;
3855
3856 // Return JVMTI_ERROR_NOT_AVAILABLE if property is not readable or doesn't exist.
3857 value = Arguments::PropertyList_get_readable_value(Arguments::system_properties(), property);
3858 if (value == nullptr) {
3859 err = JVMTI_ERROR_NOT_AVAILABLE;
3860 } else {
3861 err = allocate((strlen(value)+1) * sizeof(char), (unsigned char **)value_ptr);
3862 if (err == JVMTI_ERROR_NONE) {
3863 strcpy(*value_ptr, value);
3864 }
3865 }
3866 return err;
3867 } /* end GetSystemProperty */
3868
3869
3870 // property - pre-checked for null
3871 // value - null is a valid value, must be checked
3872 jvmtiError
3873 JvmtiEnv::SetSystemProperty(const char* property, const char* value_ptr) {
3874 for (SystemProperty* p = Arguments::system_properties(); p != nullptr; p = p->next()) {
3875 if (strcmp(property, p->key()) == 0) {
3876 if (p->writeable()) {
3877 if (p->set_value(value_ptr, AllocFailStrategy::RETURN_NULL)) {
3878 return JVMTI_ERROR_NONE;
3879 } else {
3880 return JVMTI_ERROR_OUT_OF_MEMORY;
3881 }
3882 } else {
3883 // We found a property, but it's not writeable
3884 return JVMTI_ERROR_NOT_AVAILABLE;
3885 }
3886 }
3887 }
3888
3889 // We cannot find a property of the given name
3890 return JVMTI_ERROR_NOT_AVAILABLE;
3891 } /* end SetSystemProperty */