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