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