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 "precompiled.hpp"
26 #include "classfile/classLoaderExt.hpp"
27 #include "classfile/javaClasses.inline.hpp"
28 #include "classfile/stringTable.hpp"
29 #include "classfile/modules.hpp"
30 #include "classfile/systemDictionary.hpp"
31 #include "classfile/vmClasses.hpp"
32 #include "classfile/vmSymbols.hpp"
33 #include "gc/shared/collectedHeap.hpp"
34 #include "interpreter/bytecodeStream.hpp"
35 #include "interpreter/interpreter.hpp"
36 #include "jfr/jfrEvents.hpp"
37 #include "jvmtifiles/jvmtiEnv.hpp"
38 #include "logging/log.hpp"
39 #include "logging/logConfiguration.hpp"
40 #include "memory/allocation.hpp"
41 #include "memory/resourceArea.hpp"
42 #include "memory/universe.hpp"
43 #include "oops/instanceKlass.hpp"
44 #include "oops/klass.inline.hpp"
45 #include "oops/objArrayOop.inline.hpp"
46 #include "oops/oop.inline.hpp"
47 #include "prims/jniCheck.hpp"
48 #include "prims/jvm_misc.hpp"
49 #include "prims/jvmtiAgentThread.hpp"
50 #include "prims/jvmtiClassFileReconstituter.hpp"
51 #include "prims/jvmtiCodeBlobEvents.hpp"
52 #include "prims/jvmtiExtensions.hpp"
53 #include "prims/jvmtiGetLoadedClasses.hpp"
54 #include "prims/jvmtiImpl.hpp"
55 #include "prims/jvmtiManageCapabilities.hpp"
56 #include "prims/jvmtiRawMonitor.hpp"
57 #include "prims/jvmtiRedefineClasses.hpp"
58 #include "prims/jvmtiTagMap.hpp"
59 #include "prims/jvmtiThreadState.inline.hpp"
60 #include "prims/jvmtiUtil.hpp"
61 #include "runtime/arguments.hpp"
62 #include "runtime/deoptimization.hpp"
63 #include "runtime/fieldDescriptor.inline.hpp"
64 #include "runtime/handles.inline.hpp"
65 #include "runtime/interfaceSupport.inline.hpp"
66 #include "runtime/javaCalls.hpp"
67 #include "runtime/javaThread.inline.hpp"
68 #include "runtime/jfieldIDWorkaround.hpp"
69 #include "runtime/jniHandles.inline.hpp"
70 #include "runtime/objectMonitor.inline.hpp"
71 #include "runtime/os.hpp"
72 #include "runtime/osThread.hpp"
73 #include "runtime/reflectionUtils.hpp"
74 #include "runtime/signature.hpp"
75 #include "runtime/threadHeapSampler.hpp"
76 #include "runtime/threads.hpp"
77 #include "runtime/threadSMR.hpp"
78 #include "runtime/timerTrace.hpp"
79 #include "runtime/vframe.inline.hpp"
80 #include "runtime/vmThread.hpp"
81 #include "services/threadService.hpp"
82 #include "utilities/exceptions.hpp"
83 #include "utilities/preserveException.hpp"
84 #include "utilities/utf8.hpp"
85
86
87 #define FIXLATER 0 // REMOVE this when completed.
88
89 // FIXLATER: hook into JvmtiTrace
90 #define TraceJVMTICalls false
91
92 JvmtiEnv::JvmtiEnv(jint version) : JvmtiEnvBase(version) {
93 }
94
95 JvmtiEnv::~JvmtiEnv() {
96 }
97
98 JvmtiEnv*
99 JvmtiEnv::create_a_jvmti(jint version) {
100 return new JvmtiEnv(version);
101 }
102
103 // VM operation class to copy jni function table at safepoint.
104 // More than one java threads or jvmti agents may be reading/
105 // modifying jni function tables. To reduce the risk of bad
106 // interaction b/w these threads it is copied at safepoint.
107 class VM_JNIFunctionTableCopier : public VM_Operation {
108 private:
109 const struct JNINativeInterface_ *_function_table;
110 public:
111 VM_JNIFunctionTableCopier(const struct JNINativeInterface_ *func_tbl) {
112 _function_table = func_tbl;
113 };
114
115 VMOp_Type type() const { return VMOp_JNIFunctionTableCopier; }
116 void doit() {
117 copy_jni_function_table(_function_table);
118 };
119 };
120
121 //
122 // Do not change the "prefix" marker below, everything above it is copied
123 // unchanged into the filled stub, everything below is controlled by the
124 // stub filler (only method bodies are carried forward, and then only for
125 // functionality still in the spec).
126 //
127 // end file prefix
128
129 //
130 // Memory Management functions
131 //
132
133 // mem_ptr - pre-checked for null
134 jvmtiError
135 JvmtiEnv::Allocate(jlong size, unsigned char** mem_ptr) {
136 return allocate(size, mem_ptr);
137 } /* end Allocate */
138
139
140 // mem - null is a valid value, must be checked
141 jvmtiError
142 JvmtiEnv::Deallocate(unsigned char* mem) {
143 return deallocate(mem);
144 } /* end Deallocate */
145
146 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
147 // data - null is a valid value, must be checked
148 jvmtiError
149 JvmtiEnv::SetThreadLocalStorage(jthread thread, const void* data) {
150 JavaThread* current = JavaThread::current();
151 JvmtiThreadState* state = nullptr;
152 JvmtiVTMSTransitionDisabler disabler(thread);
153 ThreadsListHandle tlh(current);
154
155 JavaThread* java_thread = nullptr;
156 oop thread_obj = nullptr;
157 if (thread == nullptr) {
158 java_thread = current;
159 state = java_thread->jvmti_thread_state();
160 } else {
161 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, current, &java_thread, &thread_obj);
162 if (err != JVMTI_ERROR_NONE) {
163 return err;
164 }
165 state = java_lang_Thread::jvmti_thread_state(thread_obj);
166 }
167 if (state == nullptr) {
168 if (data == nullptr) {
169 // leaving state unset same as data set to null
170 return JVMTI_ERROR_NONE;
171 }
172 // otherwise, create the state
173 HandleMark hm(current);
174 Handle thread_handle(current, thread_obj);
175 state = JvmtiThreadState::state_for(java_thread, thread_handle);
176 if (state == nullptr) {
177 return JVMTI_ERROR_THREAD_NOT_ALIVE;
178 }
179 }
180 state->env_thread_state(this)->set_agent_thread_local_storage_data((void*)data);
181 return JVMTI_ERROR_NONE;
182 } /* end SetThreadLocalStorage */
183
184
185 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
186 // data_ptr - pre-checked for null
187 jvmtiError
188 JvmtiEnv::GetThreadLocalStorage(jthread thread, void** data_ptr) {
189 JavaThread* current_thread = JavaThread::current();
190 if (thread == nullptr) {
191 JvmtiThreadState* state = current_thread->jvmti_thread_state();
192 *data_ptr = (state == nullptr) ? nullptr :
193 state->env_thread_state(this)->get_agent_thread_local_storage_data();
194 } else {
195 // jvmti_GetThreadLocalStorage is "in native" and doesn't transition
196 // the thread to _thread_in_vm. However, when the TLS for a thread
197 // other than the current thread is required we need to transition
198 // from native so as to resolve the jthread.
199
200 MACOS_AARCH64_ONLY(ThreadWXEnable __wx(WXWrite, current_thread));
201 ThreadInVMfromNative __tiv(current_thread);
202 VM_ENTRY_BASE(jvmtiError, JvmtiEnv::GetThreadLocalStorage , current_thread)
203 debug_only(VMNativeEntryWrapper __vew;)
204
205 JvmtiVTMSTransitionDisabler disabler(thread);
206 ThreadsListHandle tlh(current_thread);
207
208 JavaThread* java_thread = nullptr;
209 oop thread_obj = nullptr;
210 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, current_thread, &java_thread, &thread_obj);
211 if (err != JVMTI_ERROR_NONE) {
212 return err;
213 }
214
215 HandleMark hm(current_thread);
216 Handle thread_handle(current_thread, thread_obj);
217 JvmtiThreadState* state = JvmtiThreadState::state_for(java_thread, thread_handle);
218 *data_ptr = (state == nullptr) ? nullptr :
219 state->env_thread_state(this)->get_agent_thread_local_storage_data();
220 }
221 return JVMTI_ERROR_NONE;
222 } /* end GetThreadLocalStorage */
223
224 //
225 // Module functions
226 //
227
228 // module_count_ptr - pre-checked for null
229 // modules_ptr - pre-checked for null
230 jvmtiError
231 JvmtiEnv::GetAllModules(jint* module_count_ptr, jobject** modules_ptr) {
232 JvmtiModuleClosure jmc;
233
234 return jmc.get_all_modules(this, module_count_ptr, modules_ptr);
235 } /* end GetAllModules */
236
237
238 // class_loader - null is a valid value, must be pre-checked
239 // package_name - pre-checked for null
240 // module_ptr - pre-checked for null
241 jvmtiError
242 JvmtiEnv::GetNamedModule(jobject class_loader, const char* package_name, jobject* module_ptr) {
243 JavaThread* THREAD = JavaThread::current(); // For exception macros.
244 ResourceMark rm(THREAD);
245
246 Handle h_loader (THREAD, JNIHandles::resolve(class_loader));
247 // Check that loader is a subclass of java.lang.ClassLoader.
248 if (h_loader.not_null() && !java_lang_ClassLoader::is_subclass(h_loader->klass())) {
249 return JVMTI_ERROR_ILLEGAL_ARGUMENT;
250 }
251 oop module = Modules::get_named_module(h_loader, package_name);
252 *module_ptr = module != nullptr ? JNIHandles::make_local(THREAD, module) : nullptr;
253 return JVMTI_ERROR_NONE;
254 } /* end GetNamedModule */
255
256
257 // module - pre-checked for null
258 // to_module - pre-checked for null
259 jvmtiError
260 JvmtiEnv::AddModuleReads(jobject module, jobject to_module) {
261 JavaThread* THREAD = JavaThread::current(); // For exception macros.
262
263 // check module
264 Handle h_module(THREAD, JNIHandles::resolve(module));
265 if (!java_lang_Module::is_instance(h_module())) {
266 return JVMTI_ERROR_INVALID_MODULE;
267 }
268 // check to_module
269 Handle h_to_module(THREAD, JNIHandles::resolve(to_module));
270 if (!java_lang_Module::is_instance(h_to_module())) {
271 return JVMTI_ERROR_INVALID_MODULE;
272 }
273 return JvmtiExport::add_module_reads(h_module, h_to_module, THREAD);
274 } /* end AddModuleReads */
275
276
277 // module - pre-checked for null
278 // pkg_name - pre-checked for null
279 // to_module - pre-checked for null
280 jvmtiError
281 JvmtiEnv::AddModuleExports(jobject module, const char* pkg_name, jobject to_module) {
282 JavaThread* THREAD = JavaThread::current(); // For exception macros.
283 Handle h_pkg = java_lang_String::create_from_str(pkg_name, THREAD);
284
285 // check module
286 Handle h_module(THREAD, JNIHandles::resolve(module));
287 if (!java_lang_Module::is_instance(h_module())) {
288 return JVMTI_ERROR_INVALID_MODULE;
289 }
290 // check to_module
291 Handle h_to_module(THREAD, JNIHandles::resolve(to_module));
292 if (!java_lang_Module::is_instance(h_to_module())) {
293 return JVMTI_ERROR_INVALID_MODULE;
294 }
295 return JvmtiExport::add_module_exports(h_module, h_pkg, h_to_module, THREAD);
296 } /* end AddModuleExports */
297
298
299 // module - pre-checked for null
300 // pkg_name - pre-checked for null
301 // to_module - pre-checked for null
302 jvmtiError
303 JvmtiEnv::AddModuleOpens(jobject module, const char* pkg_name, jobject to_module) {
304 JavaThread* THREAD = JavaThread::current(); // For exception macros.
305 Handle h_pkg = java_lang_String::create_from_str(pkg_name, THREAD);
306
307 // check module
308 Handle h_module(THREAD, JNIHandles::resolve(module));
309 if (!java_lang_Module::is_instance(h_module())) {
310 return JVMTI_ERROR_INVALID_MODULE;
311 }
312 // check to_module
313 Handle h_to_module(THREAD, JNIHandles::resolve(to_module));
314 if (!java_lang_Module::is_instance(h_to_module())) {
315 return JVMTI_ERROR_INVALID_MODULE;
316 }
317 return JvmtiExport::add_module_opens(h_module, h_pkg, h_to_module, THREAD);
318 } /* end AddModuleOpens */
319
320
321 // module - pre-checked for null
322 // service - pre-checked for null
323 jvmtiError
324 JvmtiEnv::AddModuleUses(jobject module, jclass service) {
325 JavaThread* THREAD = JavaThread::current(); // For exception macros.
326
327 // check module
328 Handle h_module(THREAD, JNIHandles::resolve(module));
329 if (!java_lang_Module::is_instance(h_module())) {
330 return JVMTI_ERROR_INVALID_MODULE;
331 }
332 // check service
333 Handle h_service(THREAD, JNIHandles::resolve_external_guard(service));
334 if (!java_lang_Class::is_instance(h_service()) ||
335 java_lang_Class::is_primitive(h_service())) {
336 return JVMTI_ERROR_INVALID_CLASS;
337 }
338 return JvmtiExport::add_module_uses(h_module, h_service, THREAD);
339 } /* end AddModuleUses */
340
341
342 // module - pre-checked for null
343 // service - pre-checked for null
344 // impl_class - pre-checked for null
345 jvmtiError
346 JvmtiEnv::AddModuleProvides(jobject module, jclass service, jclass impl_class) {
347 JavaThread* THREAD = JavaThread::current(); // For exception macros.
348
349 // check module
350 Handle h_module(THREAD, JNIHandles::resolve(module));
351 if (!java_lang_Module::is_instance(h_module())) {
352 return JVMTI_ERROR_INVALID_MODULE;
353 }
354 // check service
355 Handle h_service(THREAD, JNIHandles::resolve_external_guard(service));
356 if (!java_lang_Class::is_instance(h_service()) ||
357 java_lang_Class::is_primitive(h_service())) {
358 return JVMTI_ERROR_INVALID_CLASS;
359 }
360 // check impl_class
361 Handle h_impl_class(THREAD, JNIHandles::resolve_external_guard(impl_class));
362 if (!java_lang_Class::is_instance(h_impl_class()) ||
363 java_lang_Class::is_primitive(h_impl_class())) {
364 return JVMTI_ERROR_INVALID_CLASS;
365 }
366 return JvmtiExport::add_module_provides(h_module, h_service, h_impl_class, THREAD);
367 } /* end AddModuleProvides */
368
369 // module - pre-checked for null
370 // is_modifiable_class_ptr - pre-checked for null
371 jvmtiError
372 JvmtiEnv::IsModifiableModule(jobject module, jboolean* is_modifiable_module_ptr) {
373 JavaThread* current = JavaThread::current();
374
375 // check module
376 Handle h_module(current, JNIHandles::resolve(module));
377 if (!java_lang_Module::is_instance(h_module())) {
378 return JVMTI_ERROR_INVALID_MODULE;
379 }
380
381 *is_modifiable_module_ptr = JNI_TRUE;
382 return JVMTI_ERROR_NONE;
383 } /* end IsModifiableModule */
384
385
386 //
387 // Class functions
388 //
389
390 // class_count_ptr - pre-checked for null
391 // classes_ptr - pre-checked for null
392 jvmtiError
393 JvmtiEnv::GetLoadedClasses(jint* class_count_ptr, jclass** classes_ptr) {
394 return JvmtiGetLoadedClasses::getLoadedClasses(this, class_count_ptr, classes_ptr);
395 } /* end GetLoadedClasses */
396
397
398 // initiating_loader - null is a valid value, must be checked
399 // class_count_ptr - pre-checked for null
400 // classes_ptr - pre-checked for null
401 jvmtiError
402 JvmtiEnv::GetClassLoaderClasses(jobject initiating_loader, jint* class_count_ptr, jclass** classes_ptr) {
403 return JvmtiGetLoadedClasses::getClassLoaderClasses(this, initiating_loader,
404 class_count_ptr, classes_ptr);
405 } /* end GetClassLoaderClasses */
406
407 // k_mirror - may be primitive, this must be checked
408 // is_modifiable_class_ptr - pre-checked for null
409 jvmtiError
410 JvmtiEnv::IsModifiableClass(oop k_mirror, jboolean* is_modifiable_class_ptr) {
411 *is_modifiable_class_ptr = VM_RedefineClasses::is_modifiable_class(k_mirror)?
412 JNI_TRUE : JNI_FALSE;
413 return JVMTI_ERROR_NONE;
414 } /* end IsModifiableClass */
415
416 // class_count - pre-checked to be greater than or equal to 0
417 // classes - pre-checked for null
418 jvmtiError
419 JvmtiEnv::RetransformClasses(jint class_count, const jclass* classes) {
420 //TODO: add locking
421
422 int index;
423 JavaThread* current_thread = JavaThread::current();
424 ResourceMark rm(current_thread);
425
426 jvmtiClassDefinition* class_definitions =
427 NEW_RESOURCE_ARRAY(jvmtiClassDefinition, class_count);
428 NULL_CHECK(class_definitions, JVMTI_ERROR_OUT_OF_MEMORY);
429
430 for (index = 0; index < class_count; index++) {
431 HandleMark hm(current_thread);
432
433 jclass jcls = classes[index];
434 oop k_mirror = JNIHandles::resolve_external_guard(jcls);
435 if (k_mirror == nullptr) {
436 return JVMTI_ERROR_INVALID_CLASS;
437 }
438 if (!k_mirror->is_a(vmClasses::Class_klass())) {
439 return JVMTI_ERROR_INVALID_CLASS;
440 }
441
442 if (!VM_RedefineClasses::is_modifiable_class(k_mirror)) {
443 return JVMTI_ERROR_UNMODIFIABLE_CLASS;
444 }
445
446 Klass* klass = java_lang_Class::as_Klass(k_mirror);
447
448 jint status = klass->jvmti_class_status();
449 if (status & (JVMTI_CLASS_STATUS_ERROR)) {
450 return JVMTI_ERROR_INVALID_CLASS;
451 }
452
453 InstanceKlass* ik = InstanceKlass::cast(klass);
454 if (ik->get_cached_class_file_bytes() == nullptr) {
455 // Not cached, we need to reconstitute the class file from the
456 // VM representation. We don't attach the reconstituted class
457 // bytes to the InstanceKlass here because they have not been
458 // validated and we're not at a safepoint.
459 JvmtiClassFileReconstituter reconstituter(ik);
460 if (reconstituter.get_error() != JVMTI_ERROR_NONE) {
461 return reconstituter.get_error();
462 }
463
464 class_definitions[index].class_byte_count = (jint)reconstituter.class_file_size();
465 class_definitions[index].class_bytes = (unsigned char*)
466 reconstituter.class_file_bytes();
467 } else {
468 // it is cached, get it from the cache
469 class_definitions[index].class_byte_count = ik->get_cached_class_file_len();
470 class_definitions[index].class_bytes = ik->get_cached_class_file_bytes();
471 }
472 class_definitions[index].klass = jcls;
473 }
474 EventRetransformClasses event;
475 VM_RedefineClasses op(class_count, class_definitions, jvmti_class_load_kind_retransform);
476 VMThread::execute(&op);
477 jvmtiError error = op.check_error();
478 if (error == JVMTI_ERROR_NONE) {
479 event.set_classCount(class_count);
480 event.set_redefinitionId(op.id());
481 event.commit();
482 }
483 return error;
484 } /* end RetransformClasses */
485
486
487 // class_count - pre-checked to be greater than or equal to 0
488 // class_definitions - pre-checked for null
489 jvmtiError
490 JvmtiEnv::RedefineClasses(jint class_count, const jvmtiClassDefinition* class_definitions) {
491 //TODO: add locking
492 EventRedefineClasses event;
493 VM_RedefineClasses op(class_count, class_definitions, jvmti_class_load_kind_redefine);
494 VMThread::execute(&op);
495 jvmtiError error = op.check_error();
496 if (error == JVMTI_ERROR_NONE) {
497 event.set_classCount(class_count);
498 event.set_redefinitionId(op.id());
499 event.commit();
500 }
501 return error;
502 } /* end RedefineClasses */
503
504
505 //
506 // Object functions
507 //
508
509 // size_ptr - pre-checked for null
510 jvmtiError
511 JvmtiEnv::GetObjectSize(jobject object, jlong* size_ptr) {
512 oop mirror = JNIHandles::resolve_external_guard(object);
513 NULL_CHECK(mirror, JVMTI_ERROR_INVALID_OBJECT);
514 *size_ptr = (jlong)mirror->size() * wordSize;
515 return JVMTI_ERROR_NONE;
516 } /* end GetObjectSize */
517
518 //
519 // Method functions
520 //
521
522 // prefix - null is a valid value, must be checked
523 jvmtiError
524 JvmtiEnv::SetNativeMethodPrefix(const char* prefix) {
525 return prefix == nullptr?
526 SetNativeMethodPrefixes(0, nullptr) :
527 SetNativeMethodPrefixes(1, (char**)&prefix);
528 } /* end SetNativeMethodPrefix */
529
530
531 // prefix_count - pre-checked to be greater than or equal to 0
532 // prefixes - pre-checked for null
533 jvmtiError
534 JvmtiEnv::SetNativeMethodPrefixes(jint prefix_count, char** prefixes) {
535 // Have to grab JVMTI thread state lock to be sure that some thread
536 // isn't accessing the prefixes at the same time we are setting them.
537 // No locks during VM bring-up.
538 if (Threads::number_of_threads() == 0) {
539 return set_native_method_prefixes(prefix_count, prefixes);
540 } else {
541 MutexLocker mu(JvmtiThreadState_lock);
542 return set_native_method_prefixes(prefix_count, prefixes);
543 }
544 } /* end SetNativeMethodPrefixes */
545
546 //
547 // Event Management functions
548 //
549
550 // callbacks - null is a valid value, must be checked
551 // size_of_callbacks - pre-checked to be greater than or equal to 0
552 jvmtiError
553 JvmtiEnv::SetEventCallbacks(const jvmtiEventCallbacks* callbacks, jint size_of_callbacks) {
554 JvmtiVTMSTransitionDisabler disabler;
555 JvmtiEventController::set_event_callbacks(this, callbacks, size_of_callbacks);
556 return JVMTI_ERROR_NONE;
557 } /* end SetEventCallbacks */
558
559
560 // event_thread - null is a valid value, must be checked
561 jvmtiError
562 JvmtiEnv::SetEventNotificationMode(jvmtiEventMode mode, jvmtiEvent event_type, jthread event_thread, ...) {
563 bool enabled = (mode == JVMTI_ENABLE);
564
565 // event_type must be valid
566 if (!JvmtiEventController::is_valid_event_type(event_type)) {
567 return JVMTI_ERROR_INVALID_EVENT_TYPE;
568 }
569
570 // assure that needed capabilities are present
571 if (enabled && !JvmtiUtil::has_event_capability(event_type, get_capabilities())) {
572 return JVMTI_ERROR_MUST_POSSESS_CAPABILITY;
573 }
574
575 if (event_type == JVMTI_EVENT_CLASS_FILE_LOAD_HOOK && enabled) {
576 record_class_file_load_hook_enabled();
577 }
578 JvmtiVTMSTransitionDisabler disabler;
579
580 if (event_thread == nullptr) {
581 // Can be called at Agent_OnLoad() time with event_thread == nullptr
582 // when Thread::current() does not work yet so we cannot create a
583 // ThreadsListHandle that is common to both thread-specific and
584 // global code paths.
585
586 JvmtiEventController::set_user_enabled(this, nullptr, (oop) nullptr, event_type, enabled);
587 } else {
588 // We have a specified event_thread.
589 JavaThread* current = JavaThread::current();
590 ThreadsListHandle tlh(current);
591
592 JavaThread* java_thread = nullptr;
593 oop thread_obj = nullptr;
594 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), event_thread, current, &java_thread, &thread_obj);
595 if (err != JVMTI_ERROR_NONE) {
596 return err;
597 }
598
599 // global events cannot be controlled at thread level.
600 if (JvmtiEventController::is_global_event(event_type)) {
601 return JVMTI_ERROR_ILLEGAL_ARGUMENT;
602 }
603
604 JvmtiEventController::set_user_enabled(this, java_thread, thread_obj, event_type, enabled);
605 }
606
607 return JVMTI_ERROR_NONE;
608 } /* end SetEventNotificationMode */
609
610 //
611 // Capability functions
612 //
613
614 // capabilities_ptr - pre-checked for null
615 jvmtiError
616 JvmtiEnv::GetPotentialCapabilities(jvmtiCapabilities* capabilities_ptr) {
617 JvmtiManageCapabilities::get_potential_capabilities(get_capabilities(),
618 get_prohibited_capabilities(),
619 capabilities_ptr);
620 return JVMTI_ERROR_NONE;
621 } /* end GetPotentialCapabilities */
622
623
624 // capabilities_ptr - pre-checked for null
625 jvmtiError
626 JvmtiEnv::AddCapabilities(const jvmtiCapabilities* capabilities_ptr) {
627 return JvmtiManageCapabilities::add_capabilities(get_capabilities(),
628 get_prohibited_capabilities(),
629 capabilities_ptr,
630 get_capabilities());
631 } /* end AddCapabilities */
632
633
634 // capabilities_ptr - pre-checked for null
635 jvmtiError
636 JvmtiEnv::RelinquishCapabilities(const jvmtiCapabilities* capabilities_ptr) {
637 JvmtiManageCapabilities::relinquish_capabilities(get_capabilities(), capabilities_ptr, get_capabilities());
638 return JVMTI_ERROR_NONE;
639 } /* end RelinquishCapabilities */
640
641
642 // capabilities_ptr - pre-checked for null
643 jvmtiError
644 JvmtiEnv::GetCapabilities(jvmtiCapabilities* capabilities_ptr) {
645 JvmtiManageCapabilities::copy_capabilities(get_capabilities(), capabilities_ptr);
646 return JVMTI_ERROR_NONE;
647 } /* end GetCapabilities */
648
649 //
650 // Class Loader Search functions
651 //
652
653 // segment - pre-checked for null
654 jvmtiError
655 JvmtiEnv::AddToBootstrapClassLoaderSearch(const char* segment) {
656 jvmtiPhase phase = get_phase();
657 if (phase == JVMTI_PHASE_ONLOAD) {
658 Arguments::append_sysclasspath(segment);
659 return JVMTI_ERROR_NONE;
660 } else if (use_version_1_0_semantics()) {
661 // This JvmtiEnv requested version 1.0 semantics and this function
662 // is only allowed in the ONLOAD phase in version 1.0 so we need to
663 // return an error here.
664 return JVMTI_ERROR_WRONG_PHASE;
665 } else if (phase == JVMTI_PHASE_LIVE) {
666 // The phase is checked by the wrapper that called this function,
667 // but this thread could be racing with the thread that is
668 // terminating the VM so we check one more time.
669
670 // create the zip entry
671 ClassPathZipEntry* zip_entry = ClassLoader::create_class_path_zip_entry(segment, true);
672 if (zip_entry == nullptr) {
673 return JVMTI_ERROR_ILLEGAL_ARGUMENT;
674 }
675
676 // add the jar file to the bootclasspath
677 log_info(class, load)("opened: %s", zip_entry->name());
678 #if INCLUDE_CDS
679 ClassLoaderExt::append_boot_classpath(zip_entry);
680 #else
681 ClassLoader::add_to_boot_append_entries(zip_entry);
682 #endif
683 return JVMTI_ERROR_NONE;
684 } else {
685 return JVMTI_ERROR_WRONG_PHASE;
686 }
687
688 } /* end AddToBootstrapClassLoaderSearch */
689
690
691 // segment - pre-checked for null
692 jvmtiError
693 JvmtiEnv::AddToSystemClassLoaderSearch(const char* segment) {
694 jvmtiPhase phase = get_phase();
695
696 if (phase == JVMTI_PHASE_ONLOAD) {
697 for (SystemProperty* p = Arguments::system_properties(); p != nullptr; p = p->next()) {
698 if (strcmp("java.class.path", p->key()) == 0) {
699 p->append_value(segment);
700 break;
701 }
702 }
703 return JVMTI_ERROR_NONE;
704 } else if (phase == JVMTI_PHASE_LIVE) {
705 // The phase is checked by the wrapper that called this function,
706 // but this thread could be racing with the thread that is
707 // terminating the VM so we check one more time.
708 JavaThread* THREAD = JavaThread::current(); // For exception macros.
709 HandleMark hm(THREAD);
710
711 // create the zip entry (which will open the zip file and hence
712 // check that the segment is indeed a zip file).
713 ClassPathZipEntry* zip_entry = ClassLoader::create_class_path_zip_entry(segment, false);
714 if (zip_entry == nullptr) {
715 return JVMTI_ERROR_ILLEGAL_ARGUMENT;
716 }
717 delete zip_entry; // no longer needed
718
719 Handle loader(THREAD, SystemDictionary::java_system_loader());
720
721 // need the path as java.lang.String
722 Handle path = java_lang_String::create_from_platform_dependent_str(segment, THREAD);
723 if (HAS_PENDING_EXCEPTION) {
724 CLEAR_PENDING_EXCEPTION;
725 return JVMTI_ERROR_INTERNAL;
726 }
727
728 // Invoke the appendToClassPathForInstrumentation method - if the method
729 // is not found it means the loader doesn't support adding to the class path
730 // in the live phase.
731 {
732 JavaValue res(T_VOID);
733 JavaCalls::call_special(&res,
734 loader,
735 loader->klass(),
736 vmSymbols::appendToClassPathForInstrumentation_name(),
737 vmSymbols::appendToClassPathForInstrumentation_signature(),
738 path,
739 THREAD);
740 if (HAS_PENDING_EXCEPTION) {
741 Symbol* ex_name = PENDING_EXCEPTION->klass()->name();
742 CLEAR_PENDING_EXCEPTION;
743
744 if (ex_name == vmSymbols::java_lang_NoSuchMethodError()) {
745 return JVMTI_ERROR_CLASS_LOADER_UNSUPPORTED;
746 } else {
747 return JVMTI_ERROR_INTERNAL;
748 }
749 }
750 }
751
752 return JVMTI_ERROR_NONE;
753 } else {
754 return JVMTI_ERROR_WRONG_PHASE;
755 }
756 } /* end AddToSystemClassLoaderSearch */
757
758 //
759 // General functions
760 //
761
762 // phase_ptr - pre-checked for null
763 jvmtiError
764 JvmtiEnv::GetPhase(jvmtiPhase* phase_ptr) {
765 *phase_ptr = phase();
766 return JVMTI_ERROR_NONE;
767 } /* end GetPhase */
768
769
770 jvmtiError
771 JvmtiEnv::DisposeEnvironment() {
772 dispose();
773 return JVMTI_ERROR_NONE;
774 } /* end DisposeEnvironment */
775
776
777 // data - null is a valid value, must be checked
778 jvmtiError
779 JvmtiEnv::SetEnvironmentLocalStorage(const void* data) {
780 set_env_local_storage(data);
781 return JVMTI_ERROR_NONE;
782 } /* end SetEnvironmentLocalStorage */
783
784
785 // data_ptr - pre-checked for null
786 jvmtiError
787 JvmtiEnv::GetEnvironmentLocalStorage(void** data_ptr) {
788 *data_ptr = (void*)get_env_local_storage();
789 return JVMTI_ERROR_NONE;
790 } /* end GetEnvironmentLocalStorage */
791
792 // version_ptr - pre-checked for null
793 jvmtiError
794 JvmtiEnv::GetVersionNumber(jint* version_ptr) {
795 *version_ptr = JVMTI_VERSION;
796 return JVMTI_ERROR_NONE;
797 } /* end GetVersionNumber */
798
799
800 // name_ptr - pre-checked for null
801 jvmtiError
802 JvmtiEnv::GetErrorName(jvmtiError error, char** name_ptr) {
803 if (error < JVMTI_ERROR_NONE || error > JVMTI_ERROR_MAX) {
804 return JVMTI_ERROR_ILLEGAL_ARGUMENT;
805 }
806 const char *name = JvmtiUtil::error_name(error);
807 if (name == nullptr) {
808 return JVMTI_ERROR_ILLEGAL_ARGUMENT;
809 }
810 size_t len = strlen(name) + 1;
811 jvmtiError err = allocate(len, (unsigned char**)name_ptr);
812 if (err == JVMTI_ERROR_NONE) {
813 memcpy(*name_ptr, name, len);
814 }
815 return err;
816 } /* end GetErrorName */
817
818
819 jvmtiError
820 JvmtiEnv::SetVerboseFlag(jvmtiVerboseFlag flag, jboolean value) {
821 LogLevelType level = value == 0 ? LogLevel::Off : LogLevel::Info;
822 switch (flag) {
823 case JVMTI_VERBOSE_OTHER:
824 // ignore
825 break;
826 case JVMTI_VERBOSE_CLASS:
827 LogConfiguration::configure_stdout(level, false, LOG_TAGS(class, unload));
828 LogConfiguration::configure_stdout(level, false, LOG_TAGS(class, load));
829 break;
830 case JVMTI_VERBOSE_GC:
831 LogConfiguration::configure_stdout(level, true, LOG_TAGS(gc));
832 break;
833 case JVMTI_VERBOSE_JNI:
834 level = value == 0 ? LogLevel::Off : LogLevel::Debug;
835 LogConfiguration::configure_stdout(level, true, LOG_TAGS(jni, resolve));
836 break;
837 default:
838 return JVMTI_ERROR_ILLEGAL_ARGUMENT;
839 };
840 return JVMTI_ERROR_NONE;
841 } /* end SetVerboseFlag */
842
843
844 // format_ptr - pre-checked for null
845 jvmtiError
846 JvmtiEnv::GetJLocationFormat(jvmtiJlocationFormat* format_ptr) {
847 *format_ptr = JVMTI_JLOCATION_JVMBCI;
848 return JVMTI_ERROR_NONE;
849 } /* end GetJLocationFormat */
850
851 //
852 // Thread functions
853 //
854
855 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
856 // thread_state_ptr - pre-checked for null
857 jvmtiError
858 JvmtiEnv::GetThreadState(jthread thread, jint* thread_state_ptr) {
859 JavaThread* current_thread = JavaThread::current();
860 JvmtiVTMSTransitionDisabler disabler(thread);
861 ThreadsListHandle tlh(current_thread);
862
863 JavaThread* java_thread = nullptr;
864 oop thread_oop = nullptr;
865 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, current_thread, &java_thread, &thread_oop);
866 if (err != JVMTI_ERROR_NONE && err != JVMTI_ERROR_THREAD_NOT_ALIVE) {
867 // We got an error code so we don't have a JavaThread*, but only
868 // return an error from here if the error is not because the thread
869 // is a virtual thread.
870 return err;
871 }
872 *thread_state_ptr = JvmtiEnvBase::get_thread_or_vthread_state(thread_oop, java_thread);
873 return JVMTI_ERROR_NONE;
874 } /* end GetThreadState */
875
876
877 // thread_ptr - pre-checked for null
878 jvmtiError
879 JvmtiEnv::GetCurrentThread(jthread* thread_ptr) {
880 JavaThread* cur_thread = JavaThread::current();
881 oop thread_oop = get_vthread_or_thread_oop(cur_thread);
882
883 *thread_ptr = (jthread)JNIHandles::make_local(cur_thread, thread_oop);
884 return JVMTI_ERROR_NONE;
885 } /* end GetCurrentThread */
886
887
888 // threads_count_ptr - pre-checked for null
889 // threads_ptr - pre-checked for null
890 jvmtiError
891 JvmtiEnv::GetAllThreads(jint* threads_count_ptr, jthread** threads_ptr) {
892 int nthreads = 0;
893 Handle *thread_objs = nullptr;
894 Thread* current_thread = Thread::current();
895 ResourceMark rm(current_thread);
896 HandleMark hm(current_thread);
897
898 // enumerate threads (including agent threads)
899 ThreadsListEnumerator tle(current_thread, true);
900 nthreads = tle.num_threads();
901 *threads_count_ptr = nthreads;
902
903 if (nthreads == 0) {
904 *threads_ptr = nullptr;
905 return JVMTI_ERROR_NONE;
906 }
907
908 thread_objs = NEW_RESOURCE_ARRAY(Handle, nthreads);
909 NULL_CHECK(thread_objs, JVMTI_ERROR_OUT_OF_MEMORY);
910
911 for (int i = 0; i < nthreads; i++) {
912 thread_objs[i] = Handle(tle.get_threadObj(i));
913 }
914
915 jthread *jthreads = new_jthreadArray(nthreads, thread_objs);
916 NULL_CHECK(jthreads, JVMTI_ERROR_OUT_OF_MEMORY);
917
918 *threads_ptr = jthreads;
919 return JVMTI_ERROR_NONE;
920 } /* end GetAllThreads */
921
922
923 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
924 jvmtiError
925 JvmtiEnv::SuspendThread(jthread thread) {
926 JavaThread* current = JavaThread::current();
927 HandleMark hm(current);
928 Handle self_tobj;
929
930 jvmtiError err;
931 {
932 JvmtiVTMSTransitionDisabler disabler(true);
933 ThreadsListHandle tlh(current);
934 JavaThread* java_thread = nullptr;
935 oop thread_oop = nullptr;
936
937 err = get_threadOop_and_JavaThread(tlh.list(), thread, current, &java_thread, &thread_oop);
938 if (err != JVMTI_ERROR_NONE) {
939 return err;
940 }
941
942 // Do not use JvmtiVTMSTransitionDisabler in context of self suspend to avoid deadlocks.
943 if (java_thread != current) {
944 err = suspend_thread(thread_oop, java_thread, /* single_suspend */ true, nullptr);
945 return err;
946 }
947 // protect thread_oop as a safepoint can be reached in disabler destructor
948 self_tobj = Handle(current, thread_oop);
949 }
950 // Do self suspend for current JavaThread.
951 err = suspend_thread(self_tobj(), current, /* single_suspend */ true, nullptr);
952 return err;
953 } /* end SuspendThread */
954
955
956 // request_count - pre-checked to be greater than or equal to 0
957 // request_list - pre-checked for null
958 // results - pre-checked for null
959 jvmtiError
960 JvmtiEnv::SuspendThreadList(jint request_count, const jthread* request_list, jvmtiError* results) {
961 JavaThread* current = JavaThread::current();
962 HandleMark hm(current);
963 Handle self_tobj;
964 int self_idx = -1;
965
966 {
967 JvmtiVTMSTransitionDisabler disabler(true);
968 ThreadsListHandle tlh(current);
969
970 for (int i = 0; i < request_count; i++) {
971 JavaThread *java_thread = nullptr;
972 oop thread_oop = nullptr;
973 jthread thread = request_list[i];
974 jvmtiError err = JvmtiExport::cv_external_thread_to_JavaThread(tlh.list(), thread, &java_thread, &thread_oop);
975
976 if (thread_oop != nullptr &&
977 java_lang_VirtualThread::is_instance(thread_oop) &&
978 !JvmtiEnvBase::is_vthread_alive(thread_oop)) {
979 err = JVMTI_ERROR_THREAD_NOT_ALIVE;
980 }
981 if (err != JVMTI_ERROR_NONE) {
982 if (thread_oop == nullptr || err != JVMTI_ERROR_INVALID_THREAD) {
983 results[i] = err;
984 continue;
985 }
986 }
987 if (java_thread == current) {
988 self_idx = i;
989 self_tobj = Handle(current, thread_oop);
990 continue; // self suspend after all other suspends
991 }
992 results[i] = suspend_thread(thread_oop, java_thread, /* single_suspend */ true, nullptr);
993 }
994 }
995 // Self suspend after all other suspends if necessary.
996 // Do not use JvmtiVTMSTransitionDisabler in context of self suspend to avoid deadlocks.
997 if (self_tobj() != nullptr) {
998 // there should not be any error for current java_thread
999 results[self_idx] = suspend_thread(self_tobj(), current, /* single_suspend */ true, nullptr);
1000 }
1001 // per-thread suspend results returned via results parameter
1002 return JVMTI_ERROR_NONE;
1003 } /* end SuspendThreadList */
1004
1005
1006 jvmtiError
1007 JvmtiEnv::SuspendAllVirtualThreads(jint except_count, const jthread* except_list) {
1008 if (get_capabilities()->can_support_virtual_threads == 0) {
1009 return JVMTI_ERROR_MUST_POSSESS_CAPABILITY;
1010 }
1011 JavaThread* current = JavaThread::current();
1012 HandleMark hm(current);
1013 Handle self_tobj;
1014
1015 {
1016 ResourceMark rm(current);
1017 JvmtiVTMSTransitionDisabler disabler(true);
1018 ThreadsListHandle tlh(current);
1019 GrowableArray<jthread>* elist = new GrowableArray<jthread>(except_count);
1020
1021 jvmtiError err = JvmtiEnvBase::check_thread_list(except_count, except_list);
1022 if (err != JVMTI_ERROR_NONE) {
1023 return err;
1024 }
1025
1026 // Collect threads from except_list for which resumed status must be restored (only for VirtualThread case)
1027 for (int idx = 0; idx < except_count; idx++) {
1028 jthread thread = except_list[idx];
1029 oop thread_oop = JNIHandles::resolve_external_guard(thread);
1030 if (java_lang_VirtualThread::is_instance(thread_oop) && !JvmtiVTSuspender::is_vthread_suspended(thread_oop)) {
1031 // is not suspended, so its resumed status must be restored
1032 elist->append(except_list[idx]);
1033 }
1034 }
1035
1036 for (JavaThreadIteratorWithHandle jtiwh; JavaThread *java_thread = jtiwh.next(); ) {
1037 oop vt_oop = java_thread->jvmti_vthread();
1038 if (!java_thread->is_exiting() &&
1039 !java_thread->is_jvmti_agent_thread() &&
1040 !java_thread->is_hidden_from_external_view() &&
1041 vt_oop != nullptr &&
1042 ((java_lang_VirtualThread::is_instance(vt_oop) &&
1043 JvmtiEnvBase::is_vthread_alive(vt_oop) &&
1044 !JvmtiVTSuspender::is_vthread_suspended(vt_oop)) ||
1045 (vt_oop->is_a(vmClasses::BoundVirtualThread_klass()) && !java_thread->is_suspended())) &&
1046 !is_in_thread_list(except_count, except_list, vt_oop)
1047 ) {
1048 if (java_thread == current) {
1049 self_tobj = Handle(current, vt_oop);
1050 continue; // self suspend after all other suspends
1051 }
1052 suspend_thread(vt_oop, java_thread, /* single_suspend */ false, nullptr);
1053 }
1054 }
1055 JvmtiVTSuspender::register_all_vthreads_suspend();
1056
1057 // Restore resumed state for threads from except list that were not suspended before.
1058 for (int idx = 0; idx < elist->length(); idx++) {
1059 jthread thread = elist->at(idx);
1060 oop thread_oop = JNIHandles::resolve_external_guard(thread);
1061 if (JvmtiVTSuspender::is_vthread_suspended(thread_oop)) {
1062 JvmtiVTSuspender::register_vthread_resume(thread_oop);
1063 }
1064 }
1065 }
1066 // Self suspend after all other suspends if necessary.
1067 // Do not use JvmtiVTMSTransitionDisabler in context of self suspend to avoid deadlocks.
1068 if (self_tobj() != nullptr) {
1069 suspend_thread(self_tobj(), current, /* single_suspend */ false, nullptr);
1070 }
1071 return JVMTI_ERROR_NONE;
1072 } /* end SuspendAllVirtualThreads */
1073
1074
1075 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
1076 jvmtiError
1077 JvmtiEnv::ResumeThread(jthread thread) {
1078 JvmtiVTMSTransitionDisabler disabler(true);
1079 JavaThread* current = JavaThread::current();
1080 ThreadsListHandle tlh(current);
1081
1082 JavaThread* java_thread = nullptr;
1083 oop thread_oop = nullptr;
1084 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, current, &java_thread, &thread_oop);
1085 if (err != JVMTI_ERROR_NONE) {
1086 return err;
1087 }
1088 err = resume_thread(thread_oop, java_thread, /* single_resume */ true);
1089 return err;
1090 } /* end ResumeThread */
1091
1092
1093 // request_count - pre-checked to be greater than or equal to 0
1094 // request_list - pre-checked for null
1095 // results - pre-checked for null
1096 jvmtiError
1097 JvmtiEnv::ResumeThreadList(jint request_count, const jthread* request_list, jvmtiError* results) {
1098 oop thread_oop = nullptr;
1099 JavaThread* java_thread = nullptr;
1100 JvmtiVTMSTransitionDisabler disabler(true);
1101 ThreadsListHandle tlh;
1102
1103 for (int i = 0; i < request_count; i++) {
1104 jthread thread = request_list[i];
1105 jvmtiError err = JvmtiExport::cv_external_thread_to_JavaThread(tlh.list(), thread, &java_thread, &thread_oop);
1106
1107 if (thread_oop != nullptr &&
1108 java_lang_VirtualThread::is_instance(thread_oop) &&
1109 !JvmtiEnvBase::is_vthread_alive(thread_oop)) {
1110 err = JVMTI_ERROR_THREAD_NOT_ALIVE;
1111 }
1112 if (err != JVMTI_ERROR_NONE) {
1113 if (thread_oop == nullptr || err != JVMTI_ERROR_INVALID_THREAD) {
1114 results[i] = err;
1115 continue;
1116 }
1117 }
1118 results[i] = resume_thread(thread_oop, java_thread, /* single_resume */ true);
1119 }
1120 // per-thread resume results returned via results parameter
1121 return JVMTI_ERROR_NONE;
1122 } /* end ResumeThreadList */
1123
1124
1125 jvmtiError
1126 JvmtiEnv::ResumeAllVirtualThreads(jint except_count, const jthread* except_list) {
1127 if (get_capabilities()->can_support_virtual_threads == 0) {
1128 return JVMTI_ERROR_MUST_POSSESS_CAPABILITY;
1129 }
1130 jvmtiError err = JvmtiEnvBase::check_thread_list(except_count, except_list);
1131 if (err != JVMTI_ERROR_NONE) {
1132 return err;
1133 }
1134 ResourceMark rm;
1135 JvmtiVTMSTransitionDisabler disabler(true);
1136 GrowableArray<jthread>* elist = new GrowableArray<jthread>(except_count);
1137
1138 // Collect threads from except_list for which suspended status must be restored (only for VirtualThread case)
1139 for (int idx = 0; idx < except_count; idx++) {
1140 jthread thread = except_list[idx];
1141 oop thread_oop = JNIHandles::resolve_external_guard(thread);
1142 if (java_lang_VirtualThread::is_instance(thread_oop) && JvmtiVTSuspender::is_vthread_suspended(thread_oop)) {
1143 // is suspended, so its suspended status must be restored
1144 elist->append(except_list[idx]);
1145 }
1146 }
1147
1148 for (JavaThreadIteratorWithHandle jtiwh; JavaThread *java_thread = jtiwh.next(); ) {
1149 oop vt_oop = java_thread->jvmti_vthread();
1150 if (!java_thread->is_exiting() &&
1151 !java_thread->is_jvmti_agent_thread() &&
1152 !java_thread->is_hidden_from_external_view() &&
1153 vt_oop != nullptr &&
1154 ((java_lang_VirtualThread::is_instance(vt_oop) &&
1155 JvmtiEnvBase::is_vthread_alive(vt_oop) &&
1156 JvmtiVTSuspender::is_vthread_suspended(vt_oop)) ||
1157 (vt_oop->is_a(vmClasses::BoundVirtualThread_klass()) && java_thread->is_suspended())) &&
1158 !is_in_thread_list(except_count, except_list, vt_oop)
1159 ) {
1160 resume_thread(vt_oop, java_thread, /* single_resume */ false);
1161 }
1162 }
1163 JvmtiVTSuspender::register_all_vthreads_resume();
1164
1165 // Restore suspended state for threads from except list that were suspended before.
1166 for (int idx = 0; idx < elist->length(); idx++) {
1167 jthread thread = elist->at(idx);
1168 oop thread_oop = JNIHandles::resolve_external_guard(thread);
1169 if (!JvmtiVTSuspender::is_vthread_suspended(thread_oop)) {
1170 JvmtiVTSuspender::register_vthread_suspend(thread_oop);
1171 }
1172 }
1173 return JVMTI_ERROR_NONE;
1174 } /* end ResumeAllVirtualThreads */
1175
1176
1177 jvmtiError
1178 JvmtiEnv::StopThread(jthread thread, jobject exception) {
1179 JavaThread* current_thread = JavaThread::current();
1180
1181 JvmtiVTMSTransitionDisabler disabler(thread);
1182 ThreadsListHandle tlh(current_thread);
1183 JavaThread* java_thread = nullptr;
1184 oop thread_oop = nullptr;
1185
1186 NULL_CHECK(thread, JVMTI_ERROR_INVALID_THREAD);
1187
1188 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, current_thread, &java_thread, &thread_oop);
1189
1190 bool is_virtual = thread_oop != nullptr && thread_oop->is_a(vmClasses::BaseVirtualThread_klass());
1191
1192 if (is_virtual && !is_JavaThread_current(java_thread, thread_oop)) {
1193 if (!is_vthread_suspended(thread_oop, java_thread)) {
1194 return JVMTI_ERROR_THREAD_NOT_SUSPENDED;
1195 }
1196 if (java_thread == nullptr) { // unmounted virtual thread
1197 return JVMTI_ERROR_OPAQUE_FRAME;
1198 }
1199 }
1200 if (err != JVMTI_ERROR_NONE) {
1201 return err;
1202 }
1203 oop e = JNIHandles::resolve_external_guard(exception);
1204 NULL_CHECK(e, JVMTI_ERROR_NULL_POINTER);
1205
1206 JavaThread::send_async_exception(java_thread, e);
1207
1208 return JVMTI_ERROR_NONE;
1209
1210 } /* end StopThread */
1211
1212
1213 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
1214 jvmtiError
1215 JvmtiEnv::InterruptThread(jthread thread) {
1216 JavaThread* current_thread = JavaThread::current();
1217 HandleMark hm(current_thread);
1218
1219 JvmtiVTMSTransitionDisabler disabler(thread);
1220 ThreadsListHandle tlh(current_thread);
1221
1222 JavaThread* java_thread = nullptr;
1223 oop thread_obj = nullptr;
1224 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, current_thread, &java_thread, &thread_obj);
1225 if (err != JVMTI_ERROR_NONE) {
1226 return err;
1227 }
1228
1229 if (java_lang_VirtualThread::is_instance(thread_obj)) {
1230 // For virtual threads we have to call into Java to interrupt:
1231 Handle obj(current_thread, thread_obj);
1232 JavaValue result(T_VOID);
1233 JavaCalls::call_virtual(&result,
1234 obj,
1235 vmClasses::Thread_klass(),
1236 vmSymbols::interrupt_method_name(),
1237 vmSymbols::void_method_signature(),
1238 current_thread);
1239
1240 return JVMTI_ERROR_NONE;
1241 }
1242
1243 // Really this should be a Java call to Thread.interrupt to ensure the same
1244 // semantics, however historically this has not been done for some reason.
1245 // So we continue with that (which means we don't interact with any Java-level
1246 // Interruptible object) but we must set the Java-level interrupted state.
1247 java_lang_Thread::set_interrupted(thread_obj, true);
1248 java_thread->interrupt();
1249
1250 return JVMTI_ERROR_NONE;
1251 } /* end InterruptThread */
1252
1253
1254 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
1255 // info_ptr - pre-checked for null
1256 jvmtiError
1257 JvmtiEnv::GetThreadInfo(jthread thread, jvmtiThreadInfo* info_ptr) {
1258 JavaThread* current_thread = JavaThread::current();
1259 ResourceMark rm(current_thread);
1260 HandleMark hm(current_thread);
1261 JavaThread* java_thread = nullptr;
1262 oop thread_oop = nullptr;
1263
1264 JvmtiVTMSTransitionDisabler disabler(thread);
1265 ThreadsListHandle tlh(current_thread);
1266
1267 // if thread is null the current thread is used
1268 if (thread == nullptr) {
1269 java_thread = JavaThread::current();
1270 thread_oop = get_vthread_or_thread_oop(java_thread);
1271 if (thread_oop == nullptr || !thread_oop->is_a(vmClasses::Thread_klass())) {
1272 return JVMTI_ERROR_INVALID_THREAD;
1273 }
1274 } else {
1275 jvmtiError err = JvmtiExport::cv_external_thread_to_JavaThread(tlh.list(), thread, &java_thread, &thread_oop);
1276 if (err != JVMTI_ERROR_NONE) {
1277 // We got an error code so we don't have a JavaThread *, but
1278 // only return an error from here if we didn't get a valid
1279 // thread_oop.
1280 // In the virtual thread case the cv_external_thread_to_JavaThread is expected to correctly set
1281 // the thread_oop and return JVMTI_ERROR_INVALID_THREAD which we ignore here.
1282 if (thread_oop == nullptr) {
1283 return err;
1284 }
1285 }
1286 }
1287 // We have a valid thread_oop so we can return some thread info.
1288
1289 Handle thread_obj(current_thread, thread_oop);
1290 Handle name;
1291 ThreadPriority priority;
1292 Handle thread_group;
1293 Handle context_class_loader;
1294 bool is_daemon;
1295
1296 name = Handle(current_thread, java_lang_Thread::name(thread_obj()));
1297
1298 if (java_lang_VirtualThread::is_instance(thread_obj())) {
1299 priority = (ThreadPriority)JVMTI_THREAD_NORM_PRIORITY;
1300 is_daemon = true;
1301 if (java_lang_VirtualThread::state(thread_obj()) == java_lang_VirtualThread::TERMINATED) {
1302 thread_group = Handle(current_thread, nullptr);
1303 } else {
1304 thread_group = Handle(current_thread, java_lang_Thread_Constants::get_VTHREAD_GROUP());
1305 }
1306 } else {
1307 priority = java_lang_Thread::priority(thread_obj());
1308 is_daemon = java_lang_Thread::is_daemon(thread_obj());
1309 if (java_lang_Thread::get_thread_status(thread_obj()) == JavaThreadStatus::TERMINATED) {
1310 thread_group = Handle(current_thread, nullptr);
1311 } else {
1312 thread_group = Handle(current_thread, java_lang_Thread::threadGroup(thread_obj()));
1313 }
1314 }
1315
1316 oop loader = java_lang_Thread::context_class_loader(thread_obj());
1317 context_class_loader = Handle(current_thread, loader);
1318
1319 { const char *n;
1320
1321 if (name() != nullptr) {
1322 n = java_lang_String::as_utf8_string(name());
1323 } else {
1324 size_t utf8_length = 0;
1325 n = UNICODE::as_utf8((jchar*) nullptr, utf8_length);
1326 }
1327
1328 info_ptr->name = (char *) jvmtiMalloc(strlen(n)+1);
1329 if (info_ptr->name == nullptr)
1330 return JVMTI_ERROR_OUT_OF_MEMORY;
1331
1332 strcpy(info_ptr->name, n);
1333 }
1334 info_ptr->is_daemon = is_daemon;
1335 info_ptr->priority = priority;
1336
1337 info_ptr->context_class_loader = (context_class_loader.is_null()) ? nullptr :
1338 jni_reference(context_class_loader);
1339 info_ptr->thread_group = jni_reference(thread_group);
1340
1341 return JVMTI_ERROR_NONE;
1342 } /* end GetThreadInfo */
1343
1344
1345 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
1346 // owned_monitor_count_ptr - pre-checked for null
1347 // owned_monitors_ptr - pre-checked for null
1348 jvmtiError
1349 JvmtiEnv::GetOwnedMonitorInfo(jthread thread, jint* owned_monitor_count_ptr, jobject** owned_monitors_ptr) {
1350 JavaThread* calling_thread = JavaThread::current();
1351 HandleMark hm(calling_thread);
1352
1353 JvmtiVTMSTransitionDisabler disabler(thread);
1354 ThreadsListHandle tlh(calling_thread);
1355
1356 JavaThread* java_thread = nullptr;
1357 oop thread_oop = nullptr;
1358 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, calling_thread, &java_thread, &thread_oop);
1359 if (err != JVMTI_ERROR_NONE) {
1360 return err;
1361 }
1362
1363 if (LockingMode == LM_LEGACY && java_thread == nullptr) {
1364 *owned_monitor_count_ptr = 0;
1365 return JVMTI_ERROR_NONE;
1366 }
1367
1368 // growable array of jvmti monitors info on the C-heap
1369 GrowableArray<jvmtiMonitorStackDepthInfo*> *owned_monitors_list =
1370 new (mtServiceability) GrowableArray<jvmtiMonitorStackDepthInfo*>(1, mtServiceability);
1371
1372 Handle thread_handle(calling_thread, thread_oop);
1373 EscapeBarrier eb(java_thread != nullptr, calling_thread, java_thread);
1374 if (!eb.deoptimize_objects(MaxJavaStackTraceDepth)) {
1375 delete owned_monitors_list;
1376 return JVMTI_ERROR_OUT_OF_MEMORY;
1377 }
1378 // get owned monitors info with handshake
1379 GetOwnedMonitorInfoClosure op(this, calling_thread, owned_monitors_list);
1380 JvmtiHandshake::execute(&op, &tlh, java_thread, thread_handle);
1381 err = op.result();
1382
1383 jint owned_monitor_count = owned_monitors_list->length();
1384 if (err == JVMTI_ERROR_NONE) {
1385 if ((err = allocate(owned_monitor_count * sizeof(jobject *),
1386 (unsigned char**)owned_monitors_ptr)) == JVMTI_ERROR_NONE) {
1387 // copy into the returned array
1388 for (int i = 0; i < owned_monitor_count; i++) {
1389 (*owned_monitors_ptr)[i] =
1390 ((jvmtiMonitorStackDepthInfo*)owned_monitors_list->at(i))->monitor;
1391 }
1392 *owned_monitor_count_ptr = owned_monitor_count;
1393 }
1394 }
1395 // clean up.
1396 for (int i = 0; i < owned_monitor_count; i++) {
1397 deallocate((unsigned char*)owned_monitors_list->at(i));
1398 }
1399 delete owned_monitors_list;
1400
1401 return err;
1402 } /* end GetOwnedMonitorInfo */
1403
1404
1405 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
1406 // monitor_info_count_ptr - pre-checked for null
1407 // monitor_info_ptr - pre-checked for null
1408 jvmtiError
1409 JvmtiEnv::GetOwnedMonitorStackDepthInfo(jthread thread, jint* monitor_info_count_ptr, jvmtiMonitorStackDepthInfo** monitor_info_ptr) {
1410 JavaThread* calling_thread = JavaThread::current();
1411 HandleMark hm(calling_thread);
1412
1413 JvmtiVTMSTransitionDisabler disabler(thread);
1414 ThreadsListHandle tlh(calling_thread);
1415
1416 JavaThread* java_thread = nullptr;
1417 oop thread_oop = nullptr;
1418 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, calling_thread, &java_thread, &thread_oop);
1419 if (err != JVMTI_ERROR_NONE) {
1420 return err;
1421 }
1422
1423 if (LockingMode == LM_LEGACY && java_thread == nullptr) {
1424 *monitor_info_count_ptr = 0;
1425 return JVMTI_ERROR_NONE;
1426 }
1427
1428 // growable array of jvmti monitors info on the C-heap
1429 GrowableArray<jvmtiMonitorStackDepthInfo*> *owned_monitors_list =
1430 new (mtServiceability) GrowableArray<jvmtiMonitorStackDepthInfo*>(1, mtServiceability);
1431
1432 Handle thread_handle(calling_thread, thread_oop);
1433 EscapeBarrier eb(java_thread != nullptr, calling_thread, java_thread);
1434 if (!eb.deoptimize_objects(MaxJavaStackTraceDepth)) {
1435 delete owned_monitors_list;
1436 return JVMTI_ERROR_OUT_OF_MEMORY;
1437 }
1438 // get owned monitors info with handshake
1439 GetOwnedMonitorInfoClosure op(this, calling_thread, owned_monitors_list);
1440 JvmtiHandshake::execute(&op, &tlh, java_thread, thread_handle);
1441 err = op.result();
1442
1443 jint owned_monitor_count = owned_monitors_list->length();
1444 if (err == JVMTI_ERROR_NONE) {
1445 if ((err = allocate(owned_monitor_count * sizeof(jvmtiMonitorStackDepthInfo),
1446 (unsigned char**)monitor_info_ptr)) == JVMTI_ERROR_NONE) {
1447 // copy to output array.
1448 for (int i = 0; i < owned_monitor_count; i++) {
1449 (*monitor_info_ptr)[i].monitor =
1450 ((jvmtiMonitorStackDepthInfo*)owned_monitors_list->at(i))->monitor;
1451 (*monitor_info_ptr)[i].stack_depth =
1452 ((jvmtiMonitorStackDepthInfo*)owned_monitors_list->at(i))->stack_depth;
1453 }
1454 }
1455 *monitor_info_count_ptr = owned_monitor_count;
1456 }
1457
1458 // clean up.
1459 for (int i = 0; i < owned_monitor_count; i++) {
1460 deallocate((unsigned char*)owned_monitors_list->at(i));
1461 }
1462 delete owned_monitors_list;
1463
1464 return err;
1465 } /* end GetOwnedMonitorStackDepthInfo */
1466
1467
1468 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
1469 // monitor_ptr - pre-checked for null
1470 jvmtiError
1471 JvmtiEnv::GetCurrentContendedMonitor(jthread thread, jobject* monitor_ptr) {
1472 JavaThread* current = JavaThread::current();
1473
1474 *monitor_ptr = nullptr;
1475
1476 // get contended monitor information with handshake
1477 GetCurrentContendedMonitorClosure op(this, current, monitor_ptr);
1478 JvmtiHandshake::execute(&op, thread);
1479 return op.result();
1480 } /* end GetCurrentContendedMonitor */
1481
1482
1483 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
1484 // proc - pre-checked for null
1485 // arg - null is a valid value, must be checked
1486 jvmtiError
1487 JvmtiEnv::RunAgentThread(jthread thread, jvmtiStartFunction proc, const void* arg, jint priority) {
1488 JavaThread* current_thread = JavaThread::current();
1489
1490 JavaThread* java_thread = nullptr;
1491 oop thread_oop = nullptr;
1492 ThreadsListHandle tlh(current_thread);
1493 jvmtiError err = JvmtiExport::cv_external_thread_to_JavaThread(tlh.list(), thread, &java_thread, &thread_oop);
1494 if (err != JVMTI_ERROR_NONE) {
1495 // We got an error code so we don't have a JavaThread *, but
1496 // only return an error from here if we didn't get a valid
1497 // thread_oop.
1498 if (thread_oop == nullptr) {
1499 return err;
1500 }
1501 // We have a valid thread_oop.
1502 }
1503
1504 if (thread_oop->is_a(vmClasses::BaseVirtualThread_klass())) {
1505 // No support for virtual threads.
1506 return JVMTI_ERROR_UNSUPPORTED_OPERATION;
1507 }
1508 if (java_thread != nullptr) {
1509 // 'thread' refers to an existing JavaThread.
1510 return JVMTI_ERROR_INVALID_THREAD;
1511 }
1512
1513 if (priority < JVMTI_THREAD_MIN_PRIORITY || priority > JVMTI_THREAD_MAX_PRIORITY) {
1514 return JVMTI_ERROR_INVALID_PRIORITY;
1515 }
1516
1517 Handle thread_hndl(current_thread, thread_oop);
1518
1519 JvmtiAgentThread* new_thread = new JvmtiAgentThread(this, proc, arg);
1520
1521 // At this point it may be possible that no osthread was created for the
1522 // JavaThread due to lack of resources.
1523 if (new_thread->osthread() == nullptr) {
1524 // The new thread is not known to Thread-SMR yet so we can just delete.
1525 delete new_thread;
1526 return JVMTI_ERROR_OUT_OF_MEMORY;
1527 }
1528
1529 JavaThread::start_internal_daemon(current_thread, new_thread, thread_hndl,
1530 (ThreadPriority)priority);
1531
1532 return JVMTI_ERROR_NONE;
1533 } /* end RunAgentThread */
1534
1535 //
1536 // Thread Group functions
1537 //
1538
1539 // group_count_ptr - pre-checked for null
1540 // groups_ptr - pre-checked for null
1541 jvmtiError
1542 JvmtiEnv::GetTopThreadGroups(jint* group_count_ptr, jthreadGroup** groups_ptr) {
1543 JavaThread* current_thread = JavaThread::current();
1544
1545 // Only one top level thread group now.
1546 *group_count_ptr = 1;
1547
1548 // Allocate memory to store global-refs to the thread groups.
1549 // Assume this area is freed by caller.
1550 *groups_ptr = (jthreadGroup *) jvmtiMalloc((sizeof(jthreadGroup)) * (*group_count_ptr));
1551
1552 NULL_CHECK(*groups_ptr, JVMTI_ERROR_OUT_OF_MEMORY);
1553
1554 // Convert oop to Handle, then convert Handle to global-ref.
1555 {
1556 HandleMark hm(current_thread);
1557 Handle system_thread_group(current_thread, Universe::system_thread_group());
1558 *groups_ptr[0] = jni_reference(system_thread_group);
1559 }
1560
1561 return JVMTI_ERROR_NONE;
1562 } /* end GetTopThreadGroups */
1563
1564
1565 // info_ptr - pre-checked for null
1566 jvmtiError
1567 JvmtiEnv::GetThreadGroupInfo(jthreadGroup group, jvmtiThreadGroupInfo* info_ptr) {
1568 Thread* current_thread = Thread::current();
1569 ResourceMark rm(current_thread);
1570 HandleMark hm(current_thread);
1571
1572 Handle group_obj (current_thread, JNIHandles::resolve_external_guard(group));
1573 NULL_CHECK(group_obj(), JVMTI_ERROR_INVALID_THREAD_GROUP);
1574
1575 const char* name;
1576 Handle parent_group;
1577 bool is_daemon;
1578 ThreadPriority max_priority;
1579
1580 name = java_lang_ThreadGroup::name(group_obj());
1581 parent_group = Handle(current_thread, java_lang_ThreadGroup::parent(group_obj()));
1582 is_daemon = java_lang_ThreadGroup::is_daemon(group_obj());
1583 max_priority = java_lang_ThreadGroup::maxPriority(group_obj());
1584
1585 info_ptr->is_daemon = is_daemon;
1586 info_ptr->max_priority = max_priority;
1587 info_ptr->parent = jni_reference(parent_group);
1588
1589 if (name != nullptr) {
1590 info_ptr->name = (char*)jvmtiMalloc(strlen(name)+1);
1591 NULL_CHECK(info_ptr->name, JVMTI_ERROR_OUT_OF_MEMORY);
1592 strcpy(info_ptr->name, name);
1593 } else {
1594 info_ptr->name = nullptr;
1595 }
1596
1597 return JVMTI_ERROR_NONE;
1598 } /* end GetThreadGroupInfo */
1599
1600 // thread_count_ptr - pre-checked for null
1601 // threads_ptr - pre-checked for null
1602 // group_count_ptr - pre-checked for null
1603 // groups_ptr - pre-checked for null
1604 jvmtiError
1605 JvmtiEnv::GetThreadGroupChildren(jthreadGroup group, jint* thread_count_ptr, jthread** threads_ptr, jint* group_count_ptr, jthreadGroup** groups_ptr) {
1606 jvmtiError err;
1607 JavaThread* current_thread = JavaThread::current();
1608 oop group_obj = JNIHandles::resolve_external_guard(group);
1609 NULL_CHECK(group_obj, JVMTI_ERROR_INVALID_THREAD_GROUP);
1610
1611 Handle *thread_objs = nullptr;
1612 objArrayHandle group_objs;
1613 jint nthreads = 0;
1614 jint ngroups = 0;
1615 int hidden_threads = 0;
1616
1617 ResourceMark rm(current_thread);
1618 HandleMark hm(current_thread);
1619
1620 Handle group_hdl(current_thread, group_obj);
1621
1622 err = get_live_threads(current_thread, group_hdl, &nthreads, &thread_objs);
1623 if (err != JVMTI_ERROR_NONE) {
1624 return err;
1625 }
1626 err = get_subgroups(current_thread, group_hdl, &ngroups, &group_objs);
1627 if (err != JVMTI_ERROR_NONE) {
1628 return err;
1629 }
1630
1631 *group_count_ptr = ngroups;
1632 *thread_count_ptr = nthreads;
1633 *threads_ptr = new_jthreadArray(nthreads, thread_objs);
1634 *groups_ptr = new_jthreadGroupArray(ngroups, group_objs);
1635 if (nthreads > 0 && *threads_ptr == nullptr) {
1636 return JVMTI_ERROR_OUT_OF_MEMORY;
1637 }
1638 if (ngroups > 0 && *groups_ptr == nullptr) {
1639 return JVMTI_ERROR_OUT_OF_MEMORY;
1640 }
1641
1642 return JVMTI_ERROR_NONE;
1643 } /* end GetThreadGroupChildren */
1644
1645
1646 //
1647 // Stack Frame functions
1648 //
1649
1650 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
1651 // max_frame_count - pre-checked to be greater than or equal to 0
1652 // frame_buffer - pre-checked for null
1653 // count_ptr - pre-checked for null
1654 jvmtiError
1655 JvmtiEnv::GetStackTrace(jthread thread, jint start_depth, jint max_frame_count, jvmtiFrameInfo* frame_buffer, jint* count_ptr) {
1656 GetStackTraceClosure op(this, start_depth, max_frame_count, frame_buffer, count_ptr);
1657 JvmtiHandshake::execute(&op, thread);
1658 return op.result();
1659 } /* end GetStackTrace */
1660
1661
1662 // max_frame_count - pre-checked to be greater than or equal to 0
1663 // stack_info_ptr - pre-checked for null
1664 // thread_count_ptr - pre-checked for null
1665 jvmtiError
1666 JvmtiEnv::GetAllStackTraces(jint max_frame_count, jvmtiStackInfo** stack_info_ptr, jint* thread_count_ptr) {
1667 jvmtiError err = JVMTI_ERROR_NONE;
1668 JavaThread* calling_thread = JavaThread::current();
1669
1670 // JVMTI get stack traces at safepoint.
1671 VM_GetAllStackTraces op(this, calling_thread, max_frame_count);
1672 VMThread::execute(&op);
1673 *thread_count_ptr = op.final_thread_count();
1674 *stack_info_ptr = op.stack_info();
1675 err = op.result();
1676 return err;
1677 } /* end GetAllStackTraces */
1678
1679
1680 // thread_count - pre-checked to be greater than or equal to 0
1681 // thread_list - pre-checked for null
1682 // max_frame_count - pre-checked to be greater than or equal to 0
1683 // stack_info_ptr - pre-checked for null
1684 jvmtiError
1685 JvmtiEnv::GetThreadListStackTraces(jint thread_count, const jthread* thread_list, jint max_frame_count, jvmtiStackInfo** stack_info_ptr) {
1686 jvmtiError err = JVMTI_ERROR_NONE;
1687
1688 if (thread_count == 1) {
1689 // Use direct handshake if we need to get only one stack trace.
1690 JavaThread *current_thread = JavaThread::current();
1691
1692 jthread thread = thread_list[0];
1693
1694 GetSingleStackTraceClosure op(this, current_thread, thread, max_frame_count);
1695 JvmtiHandshake::execute(&op, thread);
1696 err = op.result();
1697 if (err == JVMTI_ERROR_NONE) {
1698 *stack_info_ptr = op.stack_info();
1699 }
1700 } else {
1701 JvmtiVTMSTransitionDisabler disabler;
1702
1703 // JVMTI get stack traces at safepoint.
1704 VM_GetThreadListStackTraces op(this, thread_count, thread_list, max_frame_count);
1705 VMThread::execute(&op);
1706 err = op.result();
1707 if (err == JVMTI_ERROR_NONE) {
1708 *stack_info_ptr = op.stack_info();
1709 }
1710 }
1711 return err;
1712 } /* end GetThreadListStackTraces */
1713
1714
1715 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
1716 // count_ptr - pre-checked for null
1717 jvmtiError
1718 JvmtiEnv::GetFrameCount(jthread thread, jint* count_ptr) {
1719 GetFrameCountClosure op(this, count_ptr);
1720 JvmtiHandshake::execute(&op, thread);
1721 return op.result();
1722 } /* end GetFrameCount */
1723
1724
1725 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
1726 jvmtiError
1727 JvmtiEnv::PopFrame(jthread thread) {
1728 JavaThread* current_thread = JavaThread::current();
1729 HandleMark hm(current_thread);
1730
1731 if (thread == nullptr) {
1732 return JVMTI_ERROR_INVALID_THREAD;
1733 }
1734 JvmtiVTMSTransitionDisabler disabler(thread);
1735 ThreadsListHandle tlh(current_thread);
1736
1737 JavaThread* java_thread = nullptr;
1738 oop thread_obj = nullptr;
1739 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, current_thread, &java_thread, &thread_obj);
1740 Handle thread_handle(current_thread, thread_obj);
1741
1742 if (err != JVMTI_ERROR_NONE) {
1743 return err;
1744 }
1745 bool self = java_thread == current_thread;
1746
1747 err = check_non_suspended_or_opaque_frame(java_thread, thread_obj, self);
1748 if (err != JVMTI_ERROR_NONE) {
1749 return err;
1750 }
1751
1752 // retrieve or create the state
1753 JvmtiThreadState* state = JvmtiThreadState::state_for(java_thread);
1754 if (state == nullptr) {
1755 return JVMTI_ERROR_THREAD_NOT_ALIVE;
1756 }
1757
1758 // Eagerly reallocate scalar replaced objects.
1759 EscapeBarrier eb(true, current_thread, java_thread);
1760 if (!eb.deoptimize_objects(1)) {
1761 // Reallocation of scalar replaced objects failed -> return with error
1762 return JVMTI_ERROR_OUT_OF_MEMORY;
1763 }
1764
1765 MutexLocker mu(JvmtiThreadState_lock);
1766 UpdateForPopTopFrameClosure op(state);
1767 JvmtiHandshake::execute(&op, &tlh, java_thread, thread_handle);
1768 return op.result();
1769 } /* end PopFrame */
1770
1771
1772 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
1773 // depth - pre-checked as non-negative
1774 // method_ptr - pre-checked for null
1775 // location_ptr - pre-checked for null
1776 jvmtiError
1777 JvmtiEnv::GetFrameLocation(jthread thread, jint depth, jmethodID* method_ptr, jlocation* location_ptr) {
1778 GetFrameLocationClosure op(this, depth, method_ptr, location_ptr);
1779 JvmtiHandshake::execute(&op, thread);
1780 return op.result();
1781 } /* end GetFrameLocation */
1782
1783
1784 // Threads_lock NOT held, java_thread not protected by lock
1785 // depth - pre-checked as non-negative
1786 jvmtiError
1787 JvmtiEnv::NotifyFramePop(jthread thread, jint depth) {
1788 ResourceMark rm;
1789 JvmtiVTMSTransitionDisabler disabler(thread);
1790 JavaThread* current = JavaThread::current();
1791 ThreadsListHandle tlh(current);
1792
1793 JavaThread* java_thread = nullptr;
1794 oop thread_obj = nullptr;
1795 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, current, &java_thread, &thread_obj);
1796 if (err != JVMTI_ERROR_NONE) {
1797 return err;
1798 }
1799
1800 HandleMark hm(current);
1801 Handle thread_handle(current, thread_obj);
1802 JvmtiThreadState *state = JvmtiThreadState::state_for(java_thread, thread_handle);
1803 if (state == nullptr) {
1804 return JVMTI_ERROR_THREAD_NOT_ALIVE;
1805 }
1806
1807 SetOrClearFramePopClosure op(this, state, true /* set */, depth);
1808 MutexLocker mu(current, JvmtiThreadState_lock);
1809 JvmtiHandshake::execute(&op, &tlh, java_thread, thread_handle);
1810 return op.result();
1811 } /* end NotifyFramePop */
1812
1813 // Threads_lock NOT held, java_thread not protected by lock
1814 jvmtiError
1815 JvmtiEnv::ClearAllFramePops(jthread thread) {
1816 ResourceMark rm;
1817 JvmtiVTMSTransitionDisabler disabler(thread);
1818 JavaThread* current = JavaThread::current();
1819 ThreadsListHandle tlh(current);
1820
1821 JavaThread* java_thread = nullptr;
1822 oop thread_obj = nullptr;
1823 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, current, &java_thread, &thread_obj);
1824 if (err != JVMTI_ERROR_NONE) {
1825 return err;
1826 }
1827
1828 HandleMark hm(current);
1829 Handle thread_handle(current, thread_obj);
1830 JvmtiThreadState *state = JvmtiThreadState::state_for(java_thread, thread_handle);
1831 if (state == nullptr) {
1832 return JVMTI_ERROR_THREAD_NOT_ALIVE;
1833 }
1834
1835 SetOrClearFramePopClosure op(this, state, false /* clear all frame pops*/);
1836 MutexLocker mu(current, JvmtiThreadState_lock);
1837 JvmtiHandshake::execute(&op, &tlh, java_thread, thread_handle);
1838 return op.result();
1839 } /* end ClearAllFramePops */
1840
1841 //
1842 // Force Early Return functions
1843 //
1844
1845 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
1846 jvmtiError
1847 JvmtiEnv::ForceEarlyReturnObject(jthread thread, jobject value) {
1848 jvalue val;
1849 val.l = value;
1850 return force_early_return(thread, val, atos);
1851 } /* end ForceEarlyReturnObject */
1852
1853
1854 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
1855 jvmtiError
1856 JvmtiEnv::ForceEarlyReturnInt(jthread thread, jint value) {
1857 jvalue val;
1858 val.i = value;
1859 return force_early_return(thread, val, itos);
1860 } /* end ForceEarlyReturnInt */
1861
1862
1863 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
1864 jvmtiError
1865 JvmtiEnv::ForceEarlyReturnLong(jthread thread, jlong value) {
1866 jvalue val;
1867 val.j = value;
1868 return force_early_return(thread, val, ltos);
1869 } /* end ForceEarlyReturnLong */
1870
1871
1872 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
1873 jvmtiError
1874 JvmtiEnv::ForceEarlyReturnFloat(jthread thread, jfloat value) {
1875 jvalue val;
1876 val.f = value;
1877 return force_early_return(thread, val, ftos);
1878 } /* end ForceEarlyReturnFloat */
1879
1880
1881 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
1882 jvmtiError
1883 JvmtiEnv::ForceEarlyReturnDouble(jthread thread, jdouble value) {
1884 jvalue val;
1885 val.d = value;
1886 return force_early_return(thread, val, dtos);
1887 } /* end ForceEarlyReturnDouble */
1888
1889
1890 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
1891 jvmtiError
1892 JvmtiEnv::ForceEarlyReturnVoid(jthread thread) {
1893 jvalue val;
1894 val.j = 0L;
1895 return force_early_return(thread, val, vtos);
1896 } /* end ForceEarlyReturnVoid */
1897
1898
1899 //
1900 // Heap functions
1901 //
1902
1903 // klass - null is a valid value, must be checked
1904 // initial_object - null is a valid value, must be checked
1905 // callbacks - pre-checked for null
1906 // user_data - null is a valid value, must be checked
1907 jvmtiError
1908 JvmtiEnv::FollowReferences(jint heap_filter, jclass klass, jobject initial_object, const jvmtiHeapCallbacks* callbacks, const void* user_data) {
1909 // check klass if provided
1910 Klass* k = nullptr;
1911 if (klass != nullptr) {
1912 oop k_mirror = JNIHandles::resolve_external_guard(klass);
1913 if (k_mirror == nullptr) {
1914 return JVMTI_ERROR_INVALID_CLASS;
1915 }
1916 if (java_lang_Class::is_primitive(k_mirror)) {
1917 return JVMTI_ERROR_NONE;
1918 }
1919 k = java_lang_Class::as_Klass(k_mirror);
1920 if (klass == nullptr) {
1921 return JVMTI_ERROR_INVALID_CLASS;
1922 }
1923 }
1924
1925 if (initial_object != nullptr) {
1926 oop init_obj = JNIHandles::resolve_external_guard(initial_object);
1927 if (init_obj == nullptr) {
1928 return JVMTI_ERROR_INVALID_OBJECT;
1929 }
1930 }
1931
1932 Thread *thread = Thread::current();
1933 HandleMark hm(thread);
1934
1935 TraceTime t("FollowReferences", TRACETIME_LOG(Debug, jvmti, objecttagging));
1936 JvmtiTagMap::tag_map_for(this)->follow_references(heap_filter, k, initial_object, callbacks, user_data);
1937 return JVMTI_ERROR_NONE;
1938 } /* end FollowReferences */
1939
1940
1941 // klass - null is a valid value, must be checked
1942 // callbacks - pre-checked for null
1943 // user_data - null is a valid value, must be checked
1944 jvmtiError
1945 JvmtiEnv::IterateThroughHeap(jint heap_filter, jclass klass, const jvmtiHeapCallbacks* callbacks, const void* user_data) {
1946 // check klass if provided
1947 Klass* k = nullptr;
1948 if (klass != nullptr) {
1949 oop k_mirror = JNIHandles::resolve_external_guard(klass);
1950 if (k_mirror == nullptr) {
1951 return JVMTI_ERROR_INVALID_CLASS;
1952 }
1953 if (java_lang_Class::is_primitive(k_mirror)) {
1954 return JVMTI_ERROR_NONE;
1955 }
1956 k = java_lang_Class::as_Klass(k_mirror);
1957 if (k == nullptr) {
1958 return JVMTI_ERROR_INVALID_CLASS;
1959 }
1960 }
1961
1962 TraceTime t("IterateThroughHeap", TRACETIME_LOG(Debug, jvmti, objecttagging));
1963 JvmtiTagMap::tag_map_for(this)->iterate_through_heap(heap_filter, k, callbacks, user_data);
1964 return JVMTI_ERROR_NONE;
1965 } /* end IterateThroughHeap */
1966
1967
1968 // tag_ptr - pre-checked for null
1969 jvmtiError
1970 JvmtiEnv::GetTag(jobject object, jlong* tag_ptr) {
1971 oop o = JNIHandles::resolve_external_guard(object);
1972 NULL_CHECK(o, JVMTI_ERROR_INVALID_OBJECT);
1973 *tag_ptr = JvmtiTagMap::tag_map_for(this)->get_tag(object);
1974 return JVMTI_ERROR_NONE;
1975 } /* end GetTag */
1976
1977
1978 jvmtiError
1979 JvmtiEnv::SetTag(jobject object, jlong tag) {
1980 oop o = JNIHandles::resolve_external_guard(object);
1981 NULL_CHECK(o, JVMTI_ERROR_INVALID_OBJECT);
1982 JvmtiTagMap::tag_map_for(this)->set_tag(object, tag);
1983 return JVMTI_ERROR_NONE;
1984 } /* end SetTag */
1985
1986
1987 // tag_count - pre-checked to be greater than or equal to 0
1988 // tags - pre-checked for null
1989 // count_ptr - pre-checked for null
1990 // object_result_ptr - null is a valid value, must be checked
1991 // tag_result_ptr - null is a valid value, must be checked
1992 jvmtiError
1993 JvmtiEnv::GetObjectsWithTags(jint tag_count, const jlong* tags, jint* count_ptr, jobject** object_result_ptr, jlong** tag_result_ptr) {
1994 TraceTime t("GetObjectsWithTags", TRACETIME_LOG(Debug, jvmti, objecttagging));
1995 return JvmtiTagMap::tag_map_for(this)->get_objects_with_tags((jlong*)tags, tag_count, count_ptr, object_result_ptr, tag_result_ptr);
1996 } /* end GetObjectsWithTags */
1997
1998
1999 jvmtiError
2000 JvmtiEnv::ForceGarbageCollection() {
2001 Universe::heap()->collect(GCCause::_jvmti_force_gc);
2002 return JVMTI_ERROR_NONE;
2003 } /* end ForceGarbageCollection */
2004
2005
2006 //
2007 // Heap (1.0) functions
2008 //
2009
2010 // object_reference_callback - pre-checked for null
2011 // user_data - null is a valid value, must be checked
2012 jvmtiError
2013 JvmtiEnv::IterateOverObjectsReachableFromObject(jobject object, jvmtiObjectReferenceCallback object_reference_callback, const void* user_data) {
2014 oop o = JNIHandles::resolve_external_guard(object);
2015 NULL_CHECK(o, JVMTI_ERROR_INVALID_OBJECT);
2016 JvmtiTagMap::tag_map_for(this)->iterate_over_objects_reachable_from_object(object, object_reference_callback, user_data);
2017 return JVMTI_ERROR_NONE;
2018 } /* end IterateOverObjectsReachableFromObject */
2019
2020
2021 // heap_root_callback - null is a valid value, must be checked
2022 // stack_ref_callback - null is a valid value, must be checked
2023 // object_ref_callback - null is a valid value, must be checked
2024 // user_data - null is a valid value, must be checked
2025 jvmtiError
2026 JvmtiEnv::IterateOverReachableObjects(jvmtiHeapRootCallback heap_root_callback, jvmtiStackReferenceCallback stack_ref_callback, jvmtiObjectReferenceCallback object_ref_callback, const void* user_data) {
2027 TraceTime t("IterateOverReachableObjects", TRACETIME_LOG(Debug, jvmti, objecttagging));
2028 JvmtiTagMap::tag_map_for(this)->iterate_over_reachable_objects(heap_root_callback, stack_ref_callback, object_ref_callback, user_data);
2029 return JVMTI_ERROR_NONE;
2030 } /* end IterateOverReachableObjects */
2031
2032
2033 // heap_object_callback - pre-checked for null
2034 // user_data - null is a valid value, must be checked
2035 jvmtiError
2036 JvmtiEnv::IterateOverHeap(jvmtiHeapObjectFilter object_filter, jvmtiHeapObjectCallback heap_object_callback, const void* user_data) {
2037 TraceTime t("IterateOverHeap", TRACETIME_LOG(Debug, jvmti, objecttagging));
2038 Thread *thread = Thread::current();
2039 HandleMark hm(thread);
2040 JvmtiTagMap::tag_map_for(this)->iterate_over_heap(object_filter, nullptr, heap_object_callback, user_data);
2041 return JVMTI_ERROR_NONE;
2042 } /* end IterateOverHeap */
2043
2044
2045 // k_mirror - may be primitive, this must be checked
2046 // heap_object_callback - pre-checked for null
2047 // user_data - null is a valid value, must be checked
2048 jvmtiError
2049 JvmtiEnv::IterateOverInstancesOfClass(oop k_mirror, jvmtiHeapObjectFilter object_filter, jvmtiHeapObjectCallback heap_object_callback, const void* user_data) {
2050 if (java_lang_Class::is_primitive(k_mirror)) {
2051 // DO PRIMITIVE CLASS PROCESSING
2052 return JVMTI_ERROR_NONE;
2053 }
2054 Klass* klass = java_lang_Class::as_Klass(k_mirror);
2055 if (klass == nullptr) {
2056 return JVMTI_ERROR_INVALID_CLASS;
2057 }
2058 TraceTime t("IterateOverInstancesOfClass", TRACETIME_LOG(Debug, jvmti, objecttagging));
2059 JvmtiTagMap::tag_map_for(this)->iterate_over_heap(object_filter, klass, heap_object_callback, user_data);
2060 return JVMTI_ERROR_NONE;
2061 } /* end IterateOverInstancesOfClass */
2062
2063
2064 //
2065 // Local Variable functions
2066 //
2067
2068 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
2069 // depth - pre-checked as non-negative
2070 // value_ptr - pre-checked for null
2071 jvmtiError
2072 JvmtiEnv::GetLocalObject(jthread thread, jint depth, jint slot, jobject* value_ptr) {
2073 JavaThread* current_thread = JavaThread::current();
2074 // rm object is created to clean up the javaVFrame created in
2075 // doit_prologue(), but after doit() is finished with it.
2076 ResourceMark rm(current_thread);
2077 HandleMark hm(current_thread);
2078 JvmtiVTMSTransitionDisabler disabler(thread);
2079 ThreadsListHandle tlh(current_thread);
2080
2081 JavaThread* java_thread = nullptr;
2082 oop thread_obj = nullptr;
2083 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, current_thread, &java_thread, &thread_obj);
2084 if (err != JVMTI_ERROR_NONE) {
2085 return err;
2086 }
2087 bool self = is_JavaThread_current(java_thread, thread_obj);
2088
2089 if (java_lang_VirtualThread::is_instance(thread_obj)) {
2090 VM_VirtualThreadGetOrSetLocal op(this, Handle(current_thread, thread_obj),
2091 current_thread, depth, slot, self);
2092 VMThread::execute(&op);
2093 err = op.result();
2094 if (err == JVMTI_ERROR_NONE) {
2095 *value_ptr = op.value().l;
2096 }
2097 } else {
2098 // Support for ordinary threads
2099 VM_GetOrSetLocal op(java_thread, current_thread, depth, slot, self);
2100 VMThread::execute(&op);
2101 err = op.result();
2102 if (err == JVMTI_ERROR_NONE) {
2103 *value_ptr = op.value().l;
2104 }
2105 }
2106 return err;
2107 } /* end GetLocalObject */
2108
2109 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
2110 // depth - pre-checked as non-negative
2111 // value - pre-checked for null
2112 jvmtiError
2113 JvmtiEnv::GetLocalInstance(jthread thread, jint depth, jobject* value_ptr){
2114 JavaThread* current_thread = JavaThread::current();
2115 // rm object is created to clean up the javaVFrame created in
2116 // doit_prologue(), but after doit() is finished with it.
2117 ResourceMark rm(current_thread);
2118 HandleMark hm(current_thread);
2119 JvmtiVTMSTransitionDisabler disabler(thread);
2120 ThreadsListHandle tlh(current_thread);
2121
2122 JavaThread* java_thread = nullptr;
2123 oop thread_obj = nullptr;
2124 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, current_thread, &java_thread, &thread_obj);
2125 if (err != JVMTI_ERROR_NONE) {
2126 return err;
2127 }
2128 bool self = is_JavaThread_current(java_thread, thread_obj);
2129
2130 if (java_lang_VirtualThread::is_instance(thread_obj)) {
2131 VM_VirtualThreadGetReceiver op(this, Handle(current_thread, thread_obj),
2132 current_thread, depth, self);
2133 VMThread::execute(&op);
2134 err = op.result();
2135 if (err == JVMTI_ERROR_NONE) {
2136 *value_ptr = op.value().l;
2137 }
2138 } else {
2139 // Support for ordinary threads
2140 VM_GetReceiver op(java_thread, current_thread, depth, self);
2141 VMThread::execute(&op);
2142 err = op.result();
2143 if (err == JVMTI_ERROR_NONE) {
2144 *value_ptr = op.value().l;
2145 }
2146 }
2147 return err;
2148 } /* end GetLocalInstance */
2149
2150
2151 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
2152 // depth - pre-checked as non-negative
2153 // value_ptr - pre-checked for null
2154 jvmtiError
2155 JvmtiEnv::GetLocalInt(jthread thread, jint depth, jint slot, jint* value_ptr) {
2156 JavaThread* current_thread = JavaThread::current();
2157 // rm object is created to clean up the javaVFrame created in
2158 // doit_prologue(), but after doit() is finished with it.
2159 ResourceMark rm(current_thread);
2160 HandleMark hm(current_thread);
2161 JvmtiVTMSTransitionDisabler disabler(thread);
2162 ThreadsListHandle tlh(current_thread);
2163
2164 JavaThread* java_thread = nullptr;
2165 oop thread_obj = nullptr;
2166 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, current_thread, &java_thread, &thread_obj);
2167 if (err != JVMTI_ERROR_NONE) {
2168 return err;
2169 }
2170 bool self = is_JavaThread_current(java_thread, thread_obj);
2171
2172 if (java_lang_VirtualThread::is_instance(thread_obj)) {
2173 VM_VirtualThreadGetOrSetLocal op(this, Handle(current_thread, thread_obj),
2174 depth, slot, T_INT, self);
2175 VMThread::execute(&op);
2176 err = op.result();
2177 if (err == JVMTI_ERROR_NONE) {
2178 *value_ptr = op.value().i;
2179 }
2180 } else {
2181 // Support for ordinary threads
2182 VM_GetOrSetLocal op(java_thread, depth, slot, T_INT, self);
2183 VMThread::execute(&op);
2184 err = op.result();
2185 if (err == JVMTI_ERROR_NONE) {
2186 *value_ptr = op.value().i;
2187 }
2188 }
2189 return err;
2190 } /* end GetLocalInt */
2191
2192
2193 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
2194 // depth - pre-checked as non-negative
2195 // value_ptr - pre-checked for null
2196 jvmtiError
2197 JvmtiEnv::GetLocalLong(jthread thread, jint depth, jint slot, jlong* value_ptr) {
2198 JavaThread* current_thread = JavaThread::current();
2199 // rm object is created to clean up the javaVFrame created in
2200 // doit_prologue(), but after doit() is finished with it.
2201 ResourceMark rm(current_thread);
2202 HandleMark hm(current_thread);
2203 JvmtiVTMSTransitionDisabler disabler(thread);
2204 ThreadsListHandle tlh(current_thread);
2205
2206 JavaThread* java_thread = nullptr;
2207 oop thread_obj = nullptr;
2208 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, current_thread, &java_thread, &thread_obj);
2209 if (err != JVMTI_ERROR_NONE) {
2210 return err;
2211 }
2212 bool self = is_JavaThread_current(java_thread, thread_obj);
2213
2214 if (java_lang_VirtualThread::is_instance(thread_obj)) {
2215 VM_VirtualThreadGetOrSetLocal op(this, Handle(current_thread, thread_obj),
2216 depth, slot, T_LONG, self);
2217 VMThread::execute(&op);
2218 err = op.result();
2219 if (err == JVMTI_ERROR_NONE) {
2220 *value_ptr = op.value().j;
2221 }
2222 } else {
2223 // Support for ordinary threads
2224 VM_GetOrSetLocal op(java_thread, depth, slot, T_LONG, self);
2225 VMThread::execute(&op);
2226 err = op.result();
2227 if (err == JVMTI_ERROR_NONE) {
2228 *value_ptr = op.value().j;
2229 }
2230 }
2231 return err;
2232 } /* end GetLocalLong */
2233
2234
2235 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
2236 // depth - pre-checked as non-negative
2237 // value_ptr - pre-checked for null
2238 jvmtiError
2239 JvmtiEnv::GetLocalFloat(jthread thread, jint depth, jint slot, jfloat* value_ptr) {
2240 JavaThread* current_thread = JavaThread::current();
2241 // rm object is created to clean up the javaVFrame created in
2242 // doit_prologue(), but after doit() is finished with it.
2243 ResourceMark rm(current_thread);
2244 HandleMark hm(current_thread);
2245 JvmtiVTMSTransitionDisabler disabler(thread);
2246 ThreadsListHandle tlh(current_thread);
2247
2248 JavaThread* java_thread = nullptr;
2249 oop thread_obj = nullptr;
2250 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, current_thread, &java_thread, &thread_obj);
2251 if (err != JVMTI_ERROR_NONE) {
2252 return err;
2253 }
2254 bool self = is_JavaThread_current(java_thread, thread_obj);
2255
2256 if (java_lang_VirtualThread::is_instance(thread_obj)) {
2257 VM_VirtualThreadGetOrSetLocal op(this, Handle(current_thread, thread_obj),
2258 depth, slot, T_FLOAT, self);
2259 VMThread::execute(&op);
2260 err = op.result();
2261 if (err == JVMTI_ERROR_NONE) {
2262 *value_ptr = op.value().f;
2263 }
2264 } else {
2265 // Support for ordinary threads
2266 VM_GetOrSetLocal op(java_thread, depth, slot, T_FLOAT, self);
2267 VMThread::execute(&op);
2268 err = op.result();
2269 if (err == JVMTI_ERROR_NONE) {
2270 *value_ptr = op.value().f;
2271 }
2272 }
2273 return err;
2274 } /* end GetLocalFloat */
2275
2276
2277 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
2278 // depth - pre-checked as non-negative
2279 // value_ptr - pre-checked for null
2280 jvmtiError
2281 JvmtiEnv::GetLocalDouble(jthread thread, jint depth, jint slot, jdouble* value_ptr) {
2282 JavaThread* current_thread = JavaThread::current();
2283 // rm object is created to clean up the javaVFrame created in
2284 // doit_prologue(), but after doit() is finished with it.
2285 ResourceMark rm(current_thread);
2286 HandleMark hm(current_thread);
2287 JvmtiVTMSTransitionDisabler disabler(thread);
2288 ThreadsListHandle tlh(current_thread);
2289
2290 JavaThread* java_thread = nullptr;
2291 oop thread_obj = nullptr;
2292 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, current_thread, &java_thread, &thread_obj);
2293 if (err != JVMTI_ERROR_NONE) {
2294 return err;
2295 }
2296 bool self = is_JavaThread_current(java_thread, thread_obj);
2297
2298 if (java_lang_VirtualThread::is_instance(thread_obj)) {
2299 VM_VirtualThreadGetOrSetLocal op(this, Handle(current_thread, thread_obj),
2300 depth, slot, T_DOUBLE, self);
2301 VMThread::execute(&op);
2302 err = op.result();
2303 if (err == JVMTI_ERROR_NONE) {
2304 *value_ptr = op.value().d;
2305 }
2306 } else {
2307 // Support for ordinary threads
2308 VM_GetOrSetLocal op(java_thread, depth, slot, T_DOUBLE, self);
2309 VMThread::execute(&op);
2310 err = op.result();
2311 if (err == JVMTI_ERROR_NONE) {
2312 *value_ptr = op.value().d;
2313 }
2314 }
2315 return err;
2316 } /* end GetLocalDouble */
2317
2318
2319 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
2320 // depth - pre-checked as non-negative
2321 jvmtiError
2322 JvmtiEnv::SetLocalObject(jthread thread, jint depth, jint slot, jobject value) {
2323 JavaThread* current_thread = JavaThread::current();
2324 // rm object is created to clean up the javaVFrame created in
2325 // doit_prologue(), but after doit() is finished with it.
2326 ResourceMark rm(current_thread);
2327 HandleMark hm(current_thread);
2328 JvmtiVTMSTransitionDisabler disabler(thread);
2329 ThreadsListHandle tlh(current_thread);
2330
2331 JavaThread* java_thread = nullptr;
2332 oop thread_obj = nullptr;
2333 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, current_thread, &java_thread, &thread_obj);
2334 if (err != JVMTI_ERROR_NONE) {
2335 return err;
2336 }
2337 bool self = is_JavaThread_current(java_thread, thread_obj);
2338 jvalue val;
2339 val.l = value;
2340
2341 if (java_lang_VirtualThread::is_instance(thread_obj)) {
2342 VM_VirtualThreadGetOrSetLocal op(this, Handle(current_thread, thread_obj),
2343 depth, slot, T_OBJECT, val, self);
2344 VMThread::execute(&op);
2345 err = op.result();
2346 } else {
2347 // Support for ordinary threads
2348 VM_GetOrSetLocal op(java_thread, depth, slot, T_OBJECT, val, self);
2349 VMThread::execute(&op);
2350 err = op.result();
2351 }
2352 return err;
2353 } /* end SetLocalObject */
2354
2355
2356 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
2357 // depth - pre-checked as non-negative
2358 jvmtiError
2359 JvmtiEnv::SetLocalInt(jthread thread, jint depth, jint slot, jint value) {
2360 JavaThread* current_thread = JavaThread::current();
2361 // rm object is created to clean up the javaVFrame created in
2362 // doit_prologue(), but after doit() is finished with it.
2363 ResourceMark rm(current_thread);
2364 HandleMark hm(current_thread);
2365 JvmtiVTMSTransitionDisabler disabler(thread);
2366 ThreadsListHandle tlh(current_thread);
2367
2368 JavaThread* java_thread = nullptr;
2369 oop thread_obj = nullptr;
2370 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, current_thread, &java_thread, &thread_obj);
2371 if (err != JVMTI_ERROR_NONE) {
2372 return err;
2373 }
2374 bool self = is_JavaThread_current(java_thread, thread_obj);
2375 jvalue val;
2376 val.i = value;
2377
2378 if (java_lang_VirtualThread::is_instance(thread_obj)) {
2379 VM_VirtualThreadGetOrSetLocal op(this, Handle(current_thread, thread_obj),
2380 depth, slot, T_INT, val, self);
2381 VMThread::execute(&op);
2382 err = op.result();
2383 } else {
2384 // Support for ordinary threads
2385 VM_GetOrSetLocal op(java_thread, depth, slot, T_INT, val, self);
2386 VMThread::execute(&op);
2387 err = op.result();
2388 }
2389 return err;
2390 } /* end SetLocalInt */
2391
2392
2393 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
2394 // depth - pre-checked as non-negative
2395 jvmtiError
2396 JvmtiEnv::SetLocalLong(jthread thread, jint depth, jint slot, jlong value) {
2397 JavaThread* current_thread = JavaThread::current();
2398 // rm object is created to clean up the javaVFrame created in
2399 // doit_prologue(), but after doit() is finished with it.
2400 ResourceMark rm(current_thread);
2401 HandleMark hm(current_thread);
2402 JvmtiVTMSTransitionDisabler disabler(thread);
2403 ThreadsListHandle tlh(current_thread);
2404
2405 JavaThread* java_thread = nullptr;
2406 oop thread_obj = nullptr;
2407 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, current_thread, &java_thread, &thread_obj);
2408 if (err != JVMTI_ERROR_NONE) {
2409 return err;
2410 }
2411 bool self = is_JavaThread_current(java_thread, thread_obj);
2412 jvalue val;
2413 val.j = value;
2414
2415 if (java_lang_VirtualThread::is_instance(thread_obj)) {
2416 VM_VirtualThreadGetOrSetLocal op(this, Handle(current_thread, thread_obj),
2417 depth, slot, T_LONG, val, self);
2418 VMThread::execute(&op);
2419 err = op.result();
2420 } else {
2421 // Support for ordinary threads
2422 VM_GetOrSetLocal op(java_thread, depth, slot, T_LONG, val, self);
2423 VMThread::execute(&op);
2424 err = op.result();
2425 }
2426 return err;
2427 } /* end SetLocalLong */
2428
2429
2430 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
2431 // depth - pre-checked as non-negative
2432 jvmtiError
2433 JvmtiEnv::SetLocalFloat(jthread thread, jint depth, jint slot, jfloat value) {
2434 JavaThread* current_thread = JavaThread::current();
2435 // rm object is created to clean up the javaVFrame created in
2436 // doit_prologue(), but after doit() is finished with it.
2437 ResourceMark rm(current_thread);
2438 HandleMark hm(current_thread);
2439 JvmtiVTMSTransitionDisabler disabler(thread);
2440 ThreadsListHandle tlh(current_thread);
2441
2442 JavaThread* java_thread = nullptr;
2443 oop thread_obj = nullptr;
2444 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, current_thread, &java_thread, &thread_obj);
2445 if (err != JVMTI_ERROR_NONE) {
2446 return err;
2447 }
2448 bool self = is_JavaThread_current(java_thread, thread_obj);
2449 jvalue val;
2450 val.f = value;
2451
2452 if (java_lang_VirtualThread::is_instance(thread_obj)) {
2453 VM_VirtualThreadGetOrSetLocal op(this, Handle(current_thread, thread_obj),
2454 depth, slot, T_FLOAT, val, self);
2455 VMThread::execute(&op);
2456 err = op.result();
2457 } else {
2458 // Support for ordinary threads
2459 VM_GetOrSetLocal op(java_thread, depth, slot, T_FLOAT, val, self);
2460 VMThread::execute(&op);
2461 err = op.result();
2462 }
2463 return err;
2464 } /* end SetLocalFloat */
2465
2466
2467 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
2468 // depth - pre-checked as non-negative
2469 jvmtiError
2470 JvmtiEnv::SetLocalDouble(jthread thread, jint depth, jint slot, jdouble value) {
2471 JavaThread* current_thread = JavaThread::current();
2472 // rm object is created to clean up the javaVFrame created in
2473 // doit_prologue(), but after doit() is finished with it.
2474 ResourceMark rm(current_thread);
2475 HandleMark hm(current_thread);
2476 JvmtiVTMSTransitionDisabler disabler(thread);
2477 ThreadsListHandle tlh(current_thread);
2478
2479 JavaThread* java_thread = nullptr;
2480 oop thread_obj = nullptr;
2481 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, current_thread, &java_thread, &thread_obj);
2482 if (err != JVMTI_ERROR_NONE) {
2483 return err;
2484 }
2485 bool self = is_JavaThread_current(java_thread, thread_obj);
2486 jvalue val;
2487 val.d = value;
2488
2489 if (java_lang_VirtualThread::is_instance(thread_obj)) {
2490 VM_VirtualThreadGetOrSetLocal op(this, Handle(current_thread, thread_obj),
2491 depth, slot, T_DOUBLE, val, self);
2492 VMThread::execute(&op);
2493 err = op.result();
2494 } else {
2495 // Support for ordinary threads
2496 VM_GetOrSetLocal op(java_thread, depth, slot, T_DOUBLE, val, self);
2497 VMThread::execute(&op);
2498 err = op.result();
2499 }
2500 return err;
2501 } /* end SetLocalDouble */
2502
2503
2504 //
2505 // Breakpoint functions
2506 //
2507
2508 // method - pre-checked for validity, but may be null meaning obsolete method
2509 jvmtiError
2510 JvmtiEnv::SetBreakpoint(Method* method, jlocation location) {
2511 NULL_CHECK(method, JVMTI_ERROR_INVALID_METHODID);
2512 if (location < 0) { // simple invalid location check first
2513 return JVMTI_ERROR_INVALID_LOCATION;
2514 }
2515 // verify that the breakpoint is not past the end of the method
2516 if (location >= (jlocation) method->code_size()) {
2517 return JVMTI_ERROR_INVALID_LOCATION;
2518 }
2519
2520 ResourceMark rm;
2521 JvmtiBreakpoint bp(method, location);
2522 JvmtiBreakpoints& jvmti_breakpoints = JvmtiCurrentBreakpoints::get_jvmti_breakpoints();
2523 if (jvmti_breakpoints.set(bp) == JVMTI_ERROR_DUPLICATE)
2524 return JVMTI_ERROR_DUPLICATE;
2525
2526 if (TraceJVMTICalls) {
2527 jvmti_breakpoints.print();
2528 }
2529
2530 return JVMTI_ERROR_NONE;
2531 } /* end SetBreakpoint */
2532
2533
2534 // method - pre-checked for validity, but may be null meaning obsolete method
2535 jvmtiError
2536 JvmtiEnv::ClearBreakpoint(Method* method, jlocation location) {
2537 NULL_CHECK(method, JVMTI_ERROR_INVALID_METHODID);
2538
2539 if (location < 0) { // simple invalid location check first
2540 return JVMTI_ERROR_INVALID_LOCATION;
2541 }
2542
2543 // verify that the breakpoint is not past the end of the method
2544 if (location >= (jlocation) method->code_size()) {
2545 return JVMTI_ERROR_INVALID_LOCATION;
2546 }
2547
2548 JvmtiBreakpoint bp(method, location);
2549
2550 JvmtiBreakpoints& jvmti_breakpoints = JvmtiCurrentBreakpoints::get_jvmti_breakpoints();
2551 if (jvmti_breakpoints.clear(bp) == JVMTI_ERROR_NOT_FOUND)
2552 return JVMTI_ERROR_NOT_FOUND;
2553
2554 if (TraceJVMTICalls) {
2555 jvmti_breakpoints.print();
2556 }
2557
2558 return JVMTI_ERROR_NONE;
2559 } /* end ClearBreakpoint */
2560
2561
2562 //
2563 // Watched Field functions
2564 //
2565
2566 jvmtiError
2567 JvmtiEnv::SetFieldAccessWatch(fieldDescriptor* fdesc_ptr) {
2568 JvmtiVTMSTransitionDisabler disabler;
2569 // make sure we haven't set this watch before
2570 if (fdesc_ptr->is_field_access_watched()) return JVMTI_ERROR_DUPLICATE;
2571 fdesc_ptr->set_is_field_access_watched(true);
2572
2573 JvmtiEventController::change_field_watch(JVMTI_EVENT_FIELD_ACCESS, true);
2574
2575 return JVMTI_ERROR_NONE;
2576 } /* end SetFieldAccessWatch */
2577
2578
2579 jvmtiError
2580 JvmtiEnv::ClearFieldAccessWatch(fieldDescriptor* fdesc_ptr) {
2581 JvmtiVTMSTransitionDisabler disabler;
2582 // make sure we have a watch to clear
2583 if (!fdesc_ptr->is_field_access_watched()) return JVMTI_ERROR_NOT_FOUND;
2584 fdesc_ptr->set_is_field_access_watched(false);
2585
2586 JvmtiEventController::change_field_watch(JVMTI_EVENT_FIELD_ACCESS, false);
2587
2588 return JVMTI_ERROR_NONE;
2589 } /* end ClearFieldAccessWatch */
2590
2591
2592 jvmtiError
2593 JvmtiEnv::SetFieldModificationWatch(fieldDescriptor* fdesc_ptr) {
2594 JvmtiVTMSTransitionDisabler disabler;
2595 // make sure we haven't set this watch before
2596 if (fdesc_ptr->is_field_modification_watched()) return JVMTI_ERROR_DUPLICATE;
2597 fdesc_ptr->set_is_field_modification_watched(true);
2598
2599 JvmtiEventController::change_field_watch(JVMTI_EVENT_FIELD_MODIFICATION, true);
2600
2601 return JVMTI_ERROR_NONE;
2602 } /* end SetFieldModificationWatch */
2603
2604
2605 jvmtiError
2606 JvmtiEnv::ClearFieldModificationWatch(fieldDescriptor* fdesc_ptr) {
2607 JvmtiVTMSTransitionDisabler disabler;
2608 // make sure we have a watch to clear
2609 if (!fdesc_ptr->is_field_modification_watched()) return JVMTI_ERROR_NOT_FOUND;
2610 fdesc_ptr->set_is_field_modification_watched(false);
2611
2612 JvmtiEventController::change_field_watch(JVMTI_EVENT_FIELD_MODIFICATION, false);
2613
2614 return JVMTI_ERROR_NONE;
2615 } /* end ClearFieldModificationWatch */
2616
2617 //
2618 // Class functions
2619 //
2620
2621
2622 // k_mirror - may be primitive, this must be checked
2623 // signature_ptr - null is a valid value, must be checked
2624 // generic_ptr - null is a valid value, must be checked
2625 jvmtiError
2626 JvmtiEnv::GetClassSignature(oop k_mirror, char** signature_ptr, char** generic_ptr) {
2627 ResourceMark rm;
2628 bool isPrimitive = java_lang_Class::is_primitive(k_mirror);
2629 Klass* k = nullptr;
2630 if (!isPrimitive) {
2631 k = java_lang_Class::as_Klass(k_mirror);
2632 NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS);
2633 }
2634 if (signature_ptr != nullptr) {
2635 char* result = nullptr;
2636 if (isPrimitive) {
2637 char tchar = type2char(java_lang_Class::primitive_type(k_mirror));
2638 result = (char*) jvmtiMalloc(2);
2639 result[0] = tchar;
2640 result[1] = '\0';
2641 } else {
2642 const char* class_sig = k->signature_name();
2643 result = (char *) jvmtiMalloc(strlen(class_sig)+1);
2644 strcpy(result, class_sig);
2645 }
2646 *signature_ptr = result;
2647 }
2648 if (generic_ptr != nullptr) {
2649 *generic_ptr = nullptr;
2650 if (!isPrimitive && k->is_instance_klass()) {
2651 Symbol* soo = InstanceKlass::cast(k)->generic_signature();
2652 if (soo != nullptr) {
2653 const char *gen_sig = soo->as_C_string();
2654 if (gen_sig != nullptr) {
2655 char* gen_result;
2656 jvmtiError err = allocate(strlen(gen_sig) + 1,
2657 (unsigned char **)&gen_result);
2658 if (err != JVMTI_ERROR_NONE) {
2659 return err;
2660 }
2661 strcpy(gen_result, gen_sig);
2662 *generic_ptr = gen_result;
2663 }
2664 }
2665 }
2666 }
2667 return JVMTI_ERROR_NONE;
2668 } /* end GetClassSignature */
2669
2670
2671 // k_mirror - may be primitive, this must be checked
2672 // status_ptr - pre-checked for null
2673 jvmtiError
2674 JvmtiEnv::GetClassStatus(oop k_mirror, jint* status_ptr) {
2675 jint result = 0;
2676 if (java_lang_Class::is_primitive(k_mirror)) {
2677 result |= JVMTI_CLASS_STATUS_PRIMITIVE;
2678 } else {
2679 Klass* k = java_lang_Class::as_Klass(k_mirror);
2680 NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS);
2681 result = k->jvmti_class_status();
2682 }
2683 *status_ptr = result;
2684
2685 return JVMTI_ERROR_NONE;
2686 } /* end GetClassStatus */
2687
2688
2689 // k_mirror - may be primitive, this must be checked
2690 // source_name_ptr - pre-checked for null
2691 jvmtiError
2692 JvmtiEnv::GetSourceFileName(oop k_mirror, char** source_name_ptr) {
2693 if (java_lang_Class::is_primitive(k_mirror)) {
2694 return JVMTI_ERROR_ABSENT_INFORMATION;
2695 }
2696 Klass* k_klass = java_lang_Class::as_Klass(k_mirror);
2697 NULL_CHECK(k_klass, JVMTI_ERROR_INVALID_CLASS);
2698
2699 if (!k_klass->is_instance_klass()) {
2700 return JVMTI_ERROR_ABSENT_INFORMATION;
2701 }
2702
2703 Symbol* sfnOop = InstanceKlass::cast(k_klass)->source_file_name();
2704 NULL_CHECK(sfnOop, JVMTI_ERROR_ABSENT_INFORMATION);
2705 {
2706 JavaThread* current_thread = JavaThread::current();
2707 ResourceMark rm(current_thread);
2708 const char* sfncp = (const char*) sfnOop->as_C_string();
2709 *source_name_ptr = (char *) jvmtiMalloc(strlen(sfncp)+1);
2710 strcpy(*source_name_ptr, sfncp);
2711 }
2712
2713 return JVMTI_ERROR_NONE;
2714 } /* end GetSourceFileName */
2715
2716
2717 // k_mirror - may be primitive, this must be checked
2718 // modifiers_ptr - pre-checked for null
2719 jvmtiError
2720 JvmtiEnv::GetClassModifiers(oop k_mirror, jint* modifiers_ptr) {
2721 JavaThread* current_thread = JavaThread::current();
2722 jint result = 0;
2723 if (!java_lang_Class::is_primitive(k_mirror)) {
2724 Klass* k = java_lang_Class::as_Klass(k_mirror);
2725 NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS);
2726 result = k->modifier_flags();
2727
2728 // Reset the deleted ACC_SUPER bit (deleted in compute_modifier_flags()).
2729 if (k->is_super()) {
2730 result |= JVM_ACC_SUPER;
2731 }
2732 } else {
2733 result = (JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC);
2734 }
2735 *modifiers_ptr = result;
2736
2737 return JVMTI_ERROR_NONE;
2738 } /* end GetClassModifiers */
2739
2740
2741 // k_mirror - may be primitive, this must be checked
2742 // method_count_ptr - pre-checked for null
2743 // methods_ptr - pre-checked for null
2744 jvmtiError
2745 JvmtiEnv::GetClassMethods(oop k_mirror, jint* method_count_ptr, jmethodID** methods_ptr) {
2746 JavaThread* current_thread = JavaThread::current();
2747 HandleMark hm(current_thread);
2748
2749 if (java_lang_Class::is_primitive(k_mirror)) {
2750 *method_count_ptr = 0;
2751 *methods_ptr = (jmethodID*) jvmtiMalloc(0 * sizeof(jmethodID));
2752 return JVMTI_ERROR_NONE;
2753 }
2754 Klass* k = java_lang_Class::as_Klass(k_mirror);
2755 NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS);
2756
2757 // Return CLASS_NOT_PREPARED error as per JVMTI spec.
2758 if (!(k->jvmti_class_status() & (JVMTI_CLASS_STATUS_PREPARED|JVMTI_CLASS_STATUS_ARRAY) )) {
2759 return JVMTI_ERROR_CLASS_NOT_PREPARED;
2760 }
2761
2762 if (!k->is_instance_klass()) {
2763 *method_count_ptr = 0;
2764 *methods_ptr = (jmethodID*) jvmtiMalloc(0 * sizeof(jmethodID));
2765 return JVMTI_ERROR_NONE;
2766 }
2767 InstanceKlass* ik = InstanceKlass::cast(k);
2768 // Allocate the result and fill it in
2769 int result_length = ik->methods()->length();
2770 jmethodID* result_list = (jmethodID*)jvmtiMalloc(result_length * sizeof(jmethodID));
2771 int index;
2772 bool jmethodids_found = true;
2773 int skipped = 0; // skip overpass methods
2774
2775 for (index = 0; index < result_length; index++) {
2776 Method* m = ik->methods()->at(index);
2777 // Depending on can_maintain_original_method_order capability use the original
2778 // method ordering indices stored in the class, so we can emit jmethodIDs in
2779 // the order they appeared in the class file or just copy in current order.
2780 int result_index = JvmtiExport::can_maintain_original_method_order() ? ik->method_ordering()->at(index) : index;
2781 assert(result_index >= 0 && result_index < result_length, "invalid original method index");
2782 if (m->is_overpass()) {
2783 result_list[result_index] = nullptr;
2784 skipped++;
2785 continue;
2786 }
2787 jmethodID id;
2788 if (jmethodids_found) {
2789 id = m->find_jmethod_id_or_null();
2790 if (id == nullptr) {
2791 // If we find an uninitialized value, make sure there is
2792 // enough space for all the uninitialized values we might
2793 // find.
2794 ik->ensure_space_for_methodids(index);
2795 jmethodids_found = false;
2796 id = m->jmethod_id();
2797 }
2798 } else {
2799 id = m->jmethod_id();
2800 }
2801 result_list[result_index] = id;
2802 }
2803
2804 // Fill in return value.
2805 if (skipped > 0) {
2806 // copy results skipping null methodIDs
2807 *methods_ptr = (jmethodID*)jvmtiMalloc((result_length - skipped) * sizeof(jmethodID));
2808 *method_count_ptr = result_length - skipped;
2809 for (index = 0, skipped = 0; index < result_length; index++) {
2810 if (result_list[index] == nullptr) {
2811 skipped++;
2812 } else {
2813 (*methods_ptr)[index - skipped] = result_list[index];
2814 }
2815 }
2816 deallocate((unsigned char *)result_list);
2817 } else {
2818 *method_count_ptr = result_length;
2819 *methods_ptr = result_list;
2820 }
2821
2822 return JVMTI_ERROR_NONE;
2823 } /* end GetClassMethods */
2824
2825
2826 // k_mirror - may be primitive, this must be checked
2827 // field_count_ptr - pre-checked for null
2828 // fields_ptr - pre-checked for null
2829 jvmtiError
2830 JvmtiEnv::GetClassFields(oop k_mirror, jint* field_count_ptr, jfieldID** fields_ptr) {
2831 if (java_lang_Class::is_primitive(k_mirror)) {
2832 *field_count_ptr = 0;
2833 *fields_ptr = (jfieldID*) jvmtiMalloc(0 * sizeof(jfieldID));
2834 return JVMTI_ERROR_NONE;
2835 }
2836 JavaThread* current_thread = JavaThread::current();
2837 HandleMark hm(current_thread);
2838 Klass* k = java_lang_Class::as_Klass(k_mirror);
2839 NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS);
2840
2841 // Return CLASS_NOT_PREPARED error as per JVMTI spec.
2842 if (!(k->jvmti_class_status() & (JVMTI_CLASS_STATUS_PREPARED|JVMTI_CLASS_STATUS_ARRAY) )) {
2843 return JVMTI_ERROR_CLASS_NOT_PREPARED;
2844 }
2845
2846 if (!k->is_instance_klass()) {
2847 *field_count_ptr = 0;
2848 *fields_ptr = (jfieldID*) jvmtiMalloc(0 * sizeof(jfieldID));
2849 return JVMTI_ERROR_NONE;
2850 }
2851
2852 InstanceKlass* ik = InstanceKlass::cast(k);
2853
2854 FilteredJavaFieldStream flds(ik);
2855
2856 int result_count = flds.field_count();
2857
2858 // Allocate the result and fill it in.
2859 jfieldID* result_list = (jfieldID*)jvmtiMalloc(result_count * sizeof(jfieldID));
2860 for (int i = 0; i < result_count; i++, flds.next()) {
2861 result_list[i] = jfieldIDWorkaround::to_jfieldID(ik, flds.offset(),
2862 flds.access_flags().is_static());
2863 }
2864 assert(flds.done(), "just checking");
2865
2866 // Fill in the results
2867 *field_count_ptr = result_count;
2868 *fields_ptr = result_list;
2869
2870 return JVMTI_ERROR_NONE;
2871 } /* end GetClassFields */
2872
2873
2874 // k_mirror - may be primitive, this must be checked
2875 // interface_count_ptr - pre-checked for null
2876 // interfaces_ptr - pre-checked for null
2877 jvmtiError
2878 JvmtiEnv::GetImplementedInterfaces(oop k_mirror, jint* interface_count_ptr, jclass** interfaces_ptr) {
2879 {
2880 if (java_lang_Class::is_primitive(k_mirror)) {
2881 *interface_count_ptr = 0;
2882 *interfaces_ptr = (jclass*) jvmtiMalloc(0 * sizeof(jclass));
2883 return JVMTI_ERROR_NONE;
2884 }
2885 JavaThread* current_thread = JavaThread::current();
2886 HandleMark hm(current_thread);
2887 Klass* k = java_lang_Class::as_Klass(k_mirror);
2888 NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS);
2889
2890 // Return CLASS_NOT_PREPARED error as per JVMTI spec.
2891 if (!(k->jvmti_class_status() & (JVMTI_CLASS_STATUS_PREPARED|JVMTI_CLASS_STATUS_ARRAY) ))
2892 return JVMTI_ERROR_CLASS_NOT_PREPARED;
2893
2894 if (!k->is_instance_klass()) {
2895 *interface_count_ptr = 0;
2896 *interfaces_ptr = (jclass*) jvmtiMalloc(0 * sizeof(jclass));
2897 return JVMTI_ERROR_NONE;
2898 }
2899
2900 Array<InstanceKlass*>* interface_list = InstanceKlass::cast(k)->local_interfaces();
2901 const int result_length = (interface_list == nullptr ? 0 : interface_list->length());
2902 jclass* result_list = (jclass*) jvmtiMalloc(result_length * sizeof(jclass));
2903 for (int i_index = 0; i_index < result_length; i_index += 1) {
2904 InstanceKlass* klass_at = interface_list->at(i_index);
2905 assert(klass_at->is_klass(), "interfaces must be Klass*s");
2906 assert(klass_at->is_interface(), "interfaces must be interfaces");
2907 oop mirror_at = klass_at->java_mirror();
2908 Handle handle_at = Handle(current_thread, mirror_at);
2909 result_list[i_index] = (jclass) jni_reference(handle_at);
2910 }
2911 *interface_count_ptr = result_length;
2912 *interfaces_ptr = result_list;
2913 }
2914
2915 return JVMTI_ERROR_NONE;
2916 } /* end GetImplementedInterfaces */
2917
2918
2919 // k_mirror - may be primitive, this must be checked
2920 // minor_version_ptr - pre-checked for null
2921 // major_version_ptr - pre-checked for null
2922 jvmtiError
2923 JvmtiEnv::GetClassVersionNumbers(oop k_mirror, jint* minor_version_ptr, jint* major_version_ptr) {
2924 if (java_lang_Class::is_primitive(k_mirror)) {
2925 return JVMTI_ERROR_ABSENT_INFORMATION;
2926 }
2927 Klass* klass = java_lang_Class::as_Klass(k_mirror);
2928
2929 jint status = klass->jvmti_class_status();
2930 if (status & (JVMTI_CLASS_STATUS_ERROR)) {
2931 return JVMTI_ERROR_INVALID_CLASS;
2932 }
2933 if (status & (JVMTI_CLASS_STATUS_ARRAY)) {
2934 return JVMTI_ERROR_ABSENT_INFORMATION;
2935 }
2936
2937 InstanceKlass* ik = InstanceKlass::cast(klass);
2938 *minor_version_ptr = ik->minor_version();
2939 *major_version_ptr = ik->major_version();
2940
2941 return JVMTI_ERROR_NONE;
2942 } /* end GetClassVersionNumbers */
2943
2944
2945 // k_mirror - may be primitive, this must be checked
2946 // constant_pool_count_ptr - pre-checked for null
2947 // constant_pool_byte_count_ptr - pre-checked for null
2948 // constant_pool_bytes_ptr - pre-checked for null
2949 jvmtiError
2950 JvmtiEnv::GetConstantPool(oop k_mirror, jint* constant_pool_count_ptr, jint* constant_pool_byte_count_ptr, unsigned char** constant_pool_bytes_ptr) {
2951 if (java_lang_Class::is_primitive(k_mirror)) {
2952 return JVMTI_ERROR_ABSENT_INFORMATION;
2953 }
2954
2955 Klass* klass = java_lang_Class::as_Klass(k_mirror);
2956 Thread *thread = Thread::current();
2957 ResourceMark rm(thread);
2958
2959 jint status = klass->jvmti_class_status();
2960 if (status & (JVMTI_CLASS_STATUS_ERROR)) {
2961 return JVMTI_ERROR_INVALID_CLASS;
2962 }
2963 if (status & (JVMTI_CLASS_STATUS_ARRAY)) {
2964 return JVMTI_ERROR_ABSENT_INFORMATION;
2965 }
2966
2967 InstanceKlass* ik = InstanceKlass::cast(klass);
2968 JvmtiConstantPoolReconstituter reconstituter(ik);
2969 if (reconstituter.get_error() != JVMTI_ERROR_NONE) {
2970 return reconstituter.get_error();
2971 }
2972
2973 unsigned char *cpool_bytes;
2974 int cpool_size = reconstituter.cpool_size();
2975 if (reconstituter.get_error() != JVMTI_ERROR_NONE) {
2976 return reconstituter.get_error();
2977 }
2978 jvmtiError res = allocate(cpool_size, &cpool_bytes);
2979 if (res != JVMTI_ERROR_NONE) {
2980 return res;
2981 }
2982 reconstituter.copy_cpool_bytes(cpool_bytes);
2983 if (reconstituter.get_error() != JVMTI_ERROR_NONE) {
2984 return reconstituter.get_error();
2985 }
2986
2987 constantPoolHandle constants(thread, ik->constants());
2988 *constant_pool_count_ptr = constants->length();
2989 *constant_pool_byte_count_ptr = cpool_size;
2990 *constant_pool_bytes_ptr = cpool_bytes;
2991
2992 return JVMTI_ERROR_NONE;
2993 } /* end GetConstantPool */
2994
2995
2996 // k_mirror - may be primitive, this must be checked
2997 // is_interface_ptr - pre-checked for null
2998 jvmtiError
2999 JvmtiEnv::IsInterface(oop k_mirror, jboolean* is_interface_ptr) {
3000 {
3001 bool result = false;
3002 if (!java_lang_Class::is_primitive(k_mirror)) {
3003 Klass* k = java_lang_Class::as_Klass(k_mirror);
3004 if (k != nullptr && k->is_interface()) {
3005 result = true;
3006 }
3007 }
3008 *is_interface_ptr = result;
3009 }
3010
3011 return JVMTI_ERROR_NONE;
3012 } /* end IsInterface */
3013
3014
3015 // k_mirror - may be primitive, this must be checked
3016 // is_array_class_ptr - pre-checked for null
3017 jvmtiError
3018 JvmtiEnv::IsArrayClass(oop k_mirror, jboolean* is_array_class_ptr) {
3019 {
3020 bool result = false;
3021 if (!java_lang_Class::is_primitive(k_mirror)) {
3022 Klass* k = java_lang_Class::as_Klass(k_mirror);
3023 if (k != nullptr && k->is_array_klass()) {
3024 result = true;
3025 }
3026 }
3027 *is_array_class_ptr = result;
3028 }
3029
3030 return JVMTI_ERROR_NONE;
3031 } /* end IsArrayClass */
3032
3033
3034 // k_mirror - may be primitive, this must be checked
3035 // classloader_ptr - pre-checked for null
3036 jvmtiError
3037 JvmtiEnv::GetClassLoader(oop k_mirror, jobject* classloader_ptr) {
3038 {
3039 if (java_lang_Class::is_primitive(k_mirror)) {
3040 *classloader_ptr = (jclass) jni_reference(Handle());
3041 return JVMTI_ERROR_NONE;
3042 }
3043 JavaThread* current_thread = JavaThread::current();
3044 HandleMark hm(current_thread);
3045 Klass* k = java_lang_Class::as_Klass(k_mirror);
3046 NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS);
3047
3048 oop result_oop = k->class_loader();
3049 if (result_oop == nullptr) {
3050 *classloader_ptr = (jclass) jni_reference(Handle());
3051 return JVMTI_ERROR_NONE;
3052 }
3053 Handle result_handle = Handle(current_thread, result_oop);
3054 jclass result_jnihandle = (jclass) jni_reference(result_handle);
3055 *classloader_ptr = result_jnihandle;
3056 }
3057 return JVMTI_ERROR_NONE;
3058 } /* end GetClassLoader */
3059
3060
3061 // k_mirror - may be primitive, this must be checked
3062 // source_debug_extension_ptr - pre-checked for null
3063 jvmtiError
3064 JvmtiEnv::GetSourceDebugExtension(oop k_mirror, char** source_debug_extension_ptr) {
3065 {
3066 if (java_lang_Class::is_primitive(k_mirror)) {
3067 return JVMTI_ERROR_ABSENT_INFORMATION;
3068 }
3069 Klass* k = java_lang_Class::as_Klass(k_mirror);
3070 NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS);
3071 if (!k->is_instance_klass()) {
3072 return JVMTI_ERROR_ABSENT_INFORMATION;
3073 }
3074 const char* sde = InstanceKlass::cast(k)->source_debug_extension();
3075 NULL_CHECK(sde, JVMTI_ERROR_ABSENT_INFORMATION);
3076
3077 {
3078 *source_debug_extension_ptr = (char *) jvmtiMalloc(strlen(sde)+1);
3079 strcpy(*source_debug_extension_ptr, sde);
3080 }
3081 }
3082
3083 return JVMTI_ERROR_NONE;
3084 } /* end GetSourceDebugExtension */
3085
3086 //
3087 // Object functions
3088 //
3089
3090 // hash_code_ptr - pre-checked for null
3091 jvmtiError
3092 JvmtiEnv::GetObjectHashCode(jobject object, jint* hash_code_ptr) {
3093 oop mirror = JNIHandles::resolve_external_guard(object);
3094 NULL_CHECK(mirror, JVMTI_ERROR_INVALID_OBJECT);
3095 NULL_CHECK(hash_code_ptr, JVMTI_ERROR_NULL_POINTER);
3096
3097 {
3098 jint result = (jint) mirror->identity_hash();
3099 *hash_code_ptr = result;
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 */