1 /*
2 * Copyright (c) 2003, 2024, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "classfile/classLoaderExt.hpp"
27 #include "classfile/javaClasses.inline.hpp"
28 #include "classfile/stringTable.hpp"
29 #include "classfile/modules.hpp"
30 #include "classfile/systemDictionary.hpp"
31 #include "classfile/vmClasses.hpp"
32 #include "classfile/vmSymbols.hpp"
33 #include "gc/shared/collectedHeap.hpp"
34 #include "interpreter/bytecodeStream.hpp"
35 #include "interpreter/interpreter.hpp"
36 #include "jfr/jfrEvents.hpp"
37 #include "jvmtifiles/jvmtiEnv.hpp"
38 #include "logging/log.hpp"
39 #include "logging/logConfiguration.hpp"
40 #include "memory/allocation.hpp"
41 #include "memory/resourceArea.hpp"
42 #include "memory/universe.hpp"
43 #include "oops/instanceKlass.hpp"
44 #include "oops/klass.inline.hpp"
45 #include "oops/objArrayOop.inline.hpp"
46 #include "oops/oop.inline.hpp"
47 #include "prims/jniCheck.hpp"
48 #include "prims/jvm_misc.hpp"
49 #include "prims/jvmtiAgentThread.hpp"
50 #include "prims/jvmtiClassFileReconstituter.hpp"
51 #include "prims/jvmtiCodeBlobEvents.hpp"
52 #include "prims/jvmtiExtensions.hpp"
53 #include "prims/jvmtiGetLoadedClasses.hpp"
54 #include "prims/jvmtiImpl.hpp"
55 #include "prims/jvmtiManageCapabilities.hpp"
56 #include "prims/jvmtiRawMonitor.hpp"
57 #include "prims/jvmtiRedefineClasses.hpp"
58 #include "prims/jvmtiTagMap.hpp"
59 #include "prims/jvmtiThreadState.inline.hpp"
60 #include "prims/jvmtiUtil.hpp"
61 #include "runtime/arguments.hpp"
62 #include "runtime/deoptimization.hpp"
63 #include "runtime/fieldDescriptor.inline.hpp"
64 #include "runtime/handles.inline.hpp"
65 #include "runtime/interfaceSupport.inline.hpp"
66 #include "runtime/javaCalls.hpp"
67 #include "runtime/javaThread.inline.hpp"
68 #include "runtime/jfieldIDWorkaround.hpp"
69 #include "runtime/jniHandles.inline.hpp"
70 #include "runtime/objectMonitor.inline.hpp"
71 #include "runtime/os.hpp"
72 #include "runtime/osThread.hpp"
73 #include "runtime/reflectionUtils.hpp"
74 #include "runtime/signature.hpp"
75 #include "runtime/threadHeapSampler.hpp"
76 #include "runtime/threads.hpp"
77 #include "runtime/threadSMR.hpp"
78 #include "runtime/timerTrace.hpp"
79 #include "runtime/vframe.inline.hpp"
80 #include "runtime/vmThread.hpp"
81 #include "services/threadService.hpp"
82 #include "utilities/exceptions.hpp"
83 #include "utilities/preserveException.hpp"
84 #include "utilities/utf8.hpp"
85
86
87 #define FIXLATER 0 // REMOVE this when completed.
88
89 // FIXLATER: hook into JvmtiTrace
90 #define TraceJVMTICalls false
91
92 JvmtiEnv::JvmtiEnv(jint version) : JvmtiEnvBase(version) {
93 }
94
95 JvmtiEnv::~JvmtiEnv() {
96 }
97
98 JvmtiEnv*
99 JvmtiEnv::create_a_jvmti(jint version) {
100 return new JvmtiEnv(version);
101 }
102
103 // VM operation class to copy jni function table at safepoint.
104 // More than one java threads or jvmti agents may be reading/
105 // modifying jni function tables. To reduce the risk of bad
106 // interaction b/w these threads it is copied at safepoint.
107 class VM_JNIFunctionTableCopier : public VM_Operation {
108 private:
109 const struct JNINativeInterface_ *_function_table;
110 public:
111 VM_JNIFunctionTableCopier(const struct JNINativeInterface_ *func_tbl) {
112 _function_table = func_tbl;
113 };
114
115 VMOp_Type type() const { return VMOp_JNIFunctionTableCopier; }
116 void doit() {
117 copy_jni_function_table(_function_table);
118 };
119 };
120
121 //
122 // Do not change the "prefix" marker below, everything above it is copied
123 // unchanged into the filled stub, everything below is controlled by the
124 // stub filler (only method bodies are carried forward, and then only for
125 // functionality still in the spec).
126 //
127 // end file prefix
128
129 //
130 // Memory Management functions
131 //
132
133 // mem_ptr - pre-checked for null
134 jvmtiError
135 JvmtiEnv::Allocate(jlong size, unsigned char** mem_ptr) {
136 return allocate(size, mem_ptr);
137 } /* end Allocate */
138
139
140 // mem - null is a valid value, must be checked
141 jvmtiError
142 JvmtiEnv::Deallocate(unsigned char* mem) {
143 return deallocate(mem);
144 } /* end Deallocate */
145
146 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
147 // data - null is a valid value, must be checked
148 jvmtiError
149 JvmtiEnv::SetThreadLocalStorage(jthread thread, const void* data) {
150 JavaThread* current = JavaThread::current();
151 JvmtiThreadState* state = nullptr;
152 JvmtiVTMSTransitionDisabler disabler(thread);
153 ThreadsListHandle tlh(current);
154
155 JavaThread* java_thread = nullptr;
156 oop thread_obj = nullptr;
157 if (thread == nullptr) {
158 java_thread = current;
159 state = java_thread->jvmti_thread_state();
160 } else {
161 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, current, &java_thread, &thread_obj);
162 if (err != JVMTI_ERROR_NONE) {
163 return err;
164 }
165 state = java_lang_Thread::jvmti_thread_state(thread_obj);
166 }
167 if (state == nullptr) {
168 if (data == nullptr) {
169 // leaving state unset same as data set to null
170 return JVMTI_ERROR_NONE;
171 }
172 // otherwise, create the state
173 HandleMark hm(current);
174 Handle thread_handle(current, thread_obj);
175 state = JvmtiThreadState::state_for(java_thread, thread_handle);
176 if (state == nullptr) {
177 return JVMTI_ERROR_THREAD_NOT_ALIVE;
178 }
179 }
180 state->env_thread_state(this)->set_agent_thread_local_storage_data((void*)data);
181 return JVMTI_ERROR_NONE;
182 } /* end SetThreadLocalStorage */
183
184
185 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
186 // data_ptr - pre-checked for null
187 jvmtiError
188 JvmtiEnv::GetThreadLocalStorage(jthread thread, void** data_ptr) {
189 JavaThread* current_thread = JavaThread::current();
190 if (thread == nullptr) {
191 JvmtiThreadState* state = current_thread->jvmti_thread_state();
192 *data_ptr = (state == nullptr) ? nullptr :
193 state->env_thread_state(this)->get_agent_thread_local_storage_data();
194 } else {
195 // jvmti_GetThreadLocalStorage is "in native" and doesn't transition
196 // the thread to _thread_in_vm. However, when the TLS for a thread
197 // other than the current thread is required we need to transition
198 // from native so as to resolve the jthread.
199
200 MACOS_AARCH64_ONLY(ThreadWXEnable __wx(WXWrite, current_thread));
201 ThreadInVMfromNative __tiv(current_thread);
202 VM_ENTRY_BASE(jvmtiError, JvmtiEnv::GetThreadLocalStorage , current_thread)
203 debug_only(VMNativeEntryWrapper __vew;)
204
205 JvmtiVTMSTransitionDisabler disabler(thread);
206 ThreadsListHandle tlh(current_thread);
207
208 JavaThread* java_thread = nullptr;
209 oop thread_obj = nullptr;
210 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, current_thread, &java_thread, &thread_obj);
211 if (err != JVMTI_ERROR_NONE) {
212 return err;
213 }
214
215 HandleMark hm(current_thread);
216 Handle thread_handle(current_thread, thread_obj);
217 JvmtiThreadState* state = JvmtiThreadState::state_for(java_thread, thread_handle);
218 *data_ptr = (state == nullptr) ? nullptr :
219 state->env_thread_state(this)->get_agent_thread_local_storage_data();
220 }
221 return JVMTI_ERROR_NONE;
222 } /* end GetThreadLocalStorage */
223
224 //
225 // Module functions
226 //
227
228 // module_count_ptr - pre-checked for null
229 // modules_ptr - pre-checked for null
230 jvmtiError
231 JvmtiEnv::GetAllModules(jint* module_count_ptr, jobject** modules_ptr) {
232 JvmtiModuleClosure jmc;
233
234 return jmc.get_all_modules(this, module_count_ptr, modules_ptr);
235 } /* end GetAllModules */
236
237
238 // class_loader - null is a valid value, must be pre-checked
239 // package_name - pre-checked for null
240 // module_ptr - pre-checked for null
241 jvmtiError
242 JvmtiEnv::GetNamedModule(jobject class_loader, const char* package_name, jobject* module_ptr) {
243 JavaThread* THREAD = JavaThread::current(); // For exception macros.
244 ResourceMark rm(THREAD);
245
246 Handle h_loader (THREAD, JNIHandles::resolve(class_loader));
247 // Check that loader is a subclass of java.lang.ClassLoader.
248 if (h_loader.not_null() && !java_lang_ClassLoader::is_subclass(h_loader->klass())) {
249 return JVMTI_ERROR_ILLEGAL_ARGUMENT;
250 }
251 oop module = Modules::get_named_module(h_loader, package_name);
252 *module_ptr = module != nullptr ? JNIHandles::make_local(THREAD, module) : nullptr;
253 return JVMTI_ERROR_NONE;
254 } /* end GetNamedModule */
255
256
257 // module - pre-checked for null
258 // to_module - pre-checked for null
259 jvmtiError
260 JvmtiEnv::AddModuleReads(jobject module, jobject to_module) {
261 JavaThread* THREAD = JavaThread::current(); // For exception macros.
262
263 // check module
264 Handle h_module(THREAD, JNIHandles::resolve(module));
265 if (!java_lang_Module::is_instance(h_module())) {
266 return JVMTI_ERROR_INVALID_MODULE;
267 }
268 // check to_module
269 Handle h_to_module(THREAD, JNIHandles::resolve(to_module));
270 if (!java_lang_Module::is_instance(h_to_module())) {
271 return JVMTI_ERROR_INVALID_MODULE;
272 }
273 return JvmtiExport::add_module_reads(h_module, h_to_module, THREAD);
274 } /* end AddModuleReads */
275
276
277 // module - pre-checked for null
278 // pkg_name - pre-checked for null
279 // to_module - pre-checked for null
280 jvmtiError
281 JvmtiEnv::AddModuleExports(jobject module, const char* pkg_name, jobject to_module) {
282 JavaThread* THREAD = JavaThread::current(); // For exception macros.
283 Handle h_pkg = java_lang_String::create_from_str(pkg_name, THREAD);
284
285 // check module
286 Handle h_module(THREAD, JNIHandles::resolve(module));
287 if (!java_lang_Module::is_instance(h_module())) {
288 return JVMTI_ERROR_INVALID_MODULE;
289 }
290 // check to_module
291 Handle h_to_module(THREAD, JNIHandles::resolve(to_module));
292 if (!java_lang_Module::is_instance(h_to_module())) {
293 return JVMTI_ERROR_INVALID_MODULE;
294 }
295 return JvmtiExport::add_module_exports(h_module, h_pkg, h_to_module, THREAD);
296 } /* end AddModuleExports */
297
298
299 // module - pre-checked for null
300 // pkg_name - pre-checked for null
301 // to_module - pre-checked for null
302 jvmtiError
303 JvmtiEnv::AddModuleOpens(jobject module, const char* pkg_name, jobject to_module) {
304 JavaThread* THREAD = JavaThread::current(); // For exception macros.
305 Handle h_pkg = java_lang_String::create_from_str(pkg_name, THREAD);
306
307 // check module
308 Handle h_module(THREAD, JNIHandles::resolve(module));
309 if (!java_lang_Module::is_instance(h_module())) {
310 return JVMTI_ERROR_INVALID_MODULE;
311 }
312 // check to_module
313 Handle h_to_module(THREAD, JNIHandles::resolve(to_module));
314 if (!java_lang_Module::is_instance(h_to_module())) {
315 return JVMTI_ERROR_INVALID_MODULE;
316 }
317 return JvmtiExport::add_module_opens(h_module, h_pkg, h_to_module, THREAD);
318 } /* end AddModuleOpens */
319
320
321 // module - pre-checked for null
322 // service - pre-checked for null
323 jvmtiError
324 JvmtiEnv::AddModuleUses(jobject module, jclass service) {
325 JavaThread* THREAD = JavaThread::current(); // For exception macros.
326
327 // check module
328 Handle h_module(THREAD, JNIHandles::resolve(module));
329 if (!java_lang_Module::is_instance(h_module())) {
330 return JVMTI_ERROR_INVALID_MODULE;
331 }
332 // check service
333 Handle h_service(THREAD, JNIHandles::resolve_external_guard(service));
334 if (!java_lang_Class::is_instance(h_service()) ||
335 java_lang_Class::is_primitive(h_service())) {
336 return JVMTI_ERROR_INVALID_CLASS;
337 }
338 return JvmtiExport::add_module_uses(h_module, h_service, THREAD);
339 } /* end AddModuleUses */
340
341
342 // module - pre-checked for null
343 // service - pre-checked for null
344 // impl_class - pre-checked for null
345 jvmtiError
346 JvmtiEnv::AddModuleProvides(jobject module, jclass service, jclass impl_class) {
347 JavaThread* THREAD = JavaThread::current(); // For exception macros.
348
349 // check module
350 Handle h_module(THREAD, JNIHandles::resolve(module));
351 if (!java_lang_Module::is_instance(h_module())) {
352 return JVMTI_ERROR_INVALID_MODULE;
353 }
354 // check service
355 Handle h_service(THREAD, JNIHandles::resolve_external_guard(service));
356 if (!java_lang_Class::is_instance(h_service()) ||
357 java_lang_Class::is_primitive(h_service())) {
358 return JVMTI_ERROR_INVALID_CLASS;
359 }
360 // check impl_class
361 Handle h_impl_class(THREAD, JNIHandles::resolve_external_guard(impl_class));
362 if (!java_lang_Class::is_instance(h_impl_class()) ||
363 java_lang_Class::is_primitive(h_impl_class())) {
364 return JVMTI_ERROR_INVALID_CLASS;
365 }
366 return JvmtiExport::add_module_provides(h_module, h_service, h_impl_class, THREAD);
367 } /* end AddModuleProvides */
368
369 // module - pre-checked for null
370 // is_modifiable_class_ptr - pre-checked for null
371 jvmtiError
372 JvmtiEnv::IsModifiableModule(jobject module, jboolean* is_modifiable_module_ptr) {
373 JavaThread* current = JavaThread::current();
374
375 // check module
376 Handle h_module(current, JNIHandles::resolve(module));
377 if (!java_lang_Module::is_instance(h_module())) {
378 return JVMTI_ERROR_INVALID_MODULE;
379 }
380
381 *is_modifiable_module_ptr = JNI_TRUE;
382 return JVMTI_ERROR_NONE;
383 } /* end IsModifiableModule */
384
385
386 //
387 // Class functions
388 //
389
390 // class_count_ptr - pre-checked for null
391 // classes_ptr - pre-checked for null
392 jvmtiError
393 JvmtiEnv::GetLoadedClasses(jint* class_count_ptr, jclass** classes_ptr) {
394 return JvmtiGetLoadedClasses::getLoadedClasses(this, class_count_ptr, classes_ptr);
395 } /* end GetLoadedClasses */
396
397
398 // initiating_loader - null is a valid value, must be checked
399 // class_count_ptr - pre-checked for null
400 // classes_ptr - pre-checked for null
401 jvmtiError
402 JvmtiEnv::GetClassLoaderClasses(jobject initiating_loader, jint* class_count_ptr, jclass** classes_ptr) {
403 return JvmtiGetLoadedClasses::getClassLoaderClasses(this, initiating_loader,
404 class_count_ptr, classes_ptr);
405 } /* end GetClassLoaderClasses */
406
407 // k_mirror - may be primitive, this must be checked
408 // is_modifiable_class_ptr - pre-checked for null
409 jvmtiError
410 JvmtiEnv::IsModifiableClass(oop k_mirror, jboolean* is_modifiable_class_ptr) {
411 *is_modifiable_class_ptr = VM_RedefineClasses::is_modifiable_class(k_mirror)?
412 JNI_TRUE : JNI_FALSE;
413 return JVMTI_ERROR_NONE;
414 } /* end IsModifiableClass */
415
416 // class_count - pre-checked to be greater than or equal to 0
417 // classes - pre-checked for null
418 jvmtiError
419 JvmtiEnv::RetransformClasses(jint class_count, const jclass* classes) {
420 //TODO: add locking
421
422 int index;
423 JavaThread* current_thread = JavaThread::current();
424 ResourceMark rm(current_thread);
425
426 jvmtiClassDefinition* class_definitions =
427 NEW_RESOURCE_ARRAY(jvmtiClassDefinition, class_count);
428 NULL_CHECK(class_definitions, JVMTI_ERROR_OUT_OF_MEMORY);
429
430 for (index = 0; index < class_count; index++) {
431 HandleMark hm(current_thread);
432
433 jclass jcls = classes[index];
434 oop k_mirror = JNIHandles::resolve_external_guard(jcls);
435 if (k_mirror == nullptr) {
436 return JVMTI_ERROR_INVALID_CLASS;
437 }
438 if (!k_mirror->is_a(vmClasses::Class_klass())) {
439 return JVMTI_ERROR_INVALID_CLASS;
440 }
441
442 if (!VM_RedefineClasses::is_modifiable_class(k_mirror)) {
443 return JVMTI_ERROR_UNMODIFIABLE_CLASS;
444 }
445
446 Klass* klass = java_lang_Class::as_Klass(k_mirror);
447
448 jint status = klass->jvmti_class_status();
449 if (status & (JVMTI_CLASS_STATUS_ERROR)) {
450 return JVMTI_ERROR_INVALID_CLASS;
451 }
452
453 InstanceKlass* ik = InstanceKlass::cast(klass);
454 if (ik->get_cached_class_file_bytes() == nullptr) {
455 // Not cached, we need to reconstitute the class file from the
456 // VM representation. We don't attach the reconstituted class
457 // bytes to the InstanceKlass here because they have not been
458 // validated and we're not at a safepoint.
459 JvmtiClassFileReconstituter reconstituter(ik);
460 if (reconstituter.get_error() != JVMTI_ERROR_NONE) {
461 return reconstituter.get_error();
462 }
463
464 class_definitions[index].class_byte_count = (jint)reconstituter.class_file_size();
465 class_definitions[index].class_bytes = (unsigned char*)
466 reconstituter.class_file_bytes();
467 } else {
468 // it is cached, get it from the cache
469 class_definitions[index].class_byte_count = ik->get_cached_class_file_len();
470 class_definitions[index].class_bytes = ik->get_cached_class_file_bytes();
471 }
472 class_definitions[index].klass = jcls;
473 }
474 EventRetransformClasses event;
475 VM_RedefineClasses op(class_count, class_definitions, jvmti_class_load_kind_retransform);
476 VMThread::execute(&op);
477 jvmtiError error = op.check_error();
478 if (error == JVMTI_ERROR_NONE) {
479 event.set_classCount(class_count);
480 event.set_redefinitionId(op.id());
481 event.commit();
482 }
483 return error;
484 } /* end RetransformClasses */
485
486
487 // class_count - pre-checked to be greater than or equal to 0
488 // class_definitions - pre-checked for null
489 jvmtiError
490 JvmtiEnv::RedefineClasses(jint class_count, const jvmtiClassDefinition* class_definitions) {
491 //TODO: add locking
492 EventRedefineClasses event;
493 VM_RedefineClasses op(class_count, class_definitions, jvmti_class_load_kind_redefine);
494 VMThread::execute(&op);
495 jvmtiError error = op.check_error();
496 if (error == JVMTI_ERROR_NONE) {
497 event.set_classCount(class_count);
498 event.set_redefinitionId(op.id());
499 event.commit();
500 }
501 return error;
502 } /* end RedefineClasses */
503
504
505 //
506 // Object functions
507 //
508
509 // size_ptr - pre-checked for null
510 jvmtiError
511 JvmtiEnv::GetObjectSize(jobject object, jlong* size_ptr) {
512 oop mirror = JNIHandles::resolve_external_guard(object);
513 NULL_CHECK(mirror, JVMTI_ERROR_INVALID_OBJECT);
514 *size_ptr = (jlong)mirror->size() * wordSize;
515 return JVMTI_ERROR_NONE;
516 } /* end GetObjectSize */
517
518 //
519 // Method functions
520 //
521
522 // prefix - null is a valid value, must be checked
523 jvmtiError
524 JvmtiEnv::SetNativeMethodPrefix(const char* prefix) {
525 return prefix == nullptr?
526 SetNativeMethodPrefixes(0, nullptr) :
527 SetNativeMethodPrefixes(1, (char**)&prefix);
528 } /* end SetNativeMethodPrefix */
529
530
531 // prefix_count - pre-checked to be greater than or equal to 0
532 // prefixes - pre-checked for null
533 jvmtiError
534 JvmtiEnv::SetNativeMethodPrefixes(jint prefix_count, char** prefixes) {
535 // Have to grab JVMTI thread state lock to be sure that some thread
536 // isn't accessing the prefixes at the same time we are setting them.
537 // No locks during VM bring-up.
538 if (Threads::number_of_threads() == 0) {
539 return set_native_method_prefixes(prefix_count, prefixes);
540 } else {
541 MutexLocker mu(JvmtiThreadState_lock);
542 return set_native_method_prefixes(prefix_count, prefixes);
543 }
544 } /* end SetNativeMethodPrefixes */
545
546 //
547 // Event Management functions
548 //
549
550 // callbacks - null is a valid value, must be checked
551 // size_of_callbacks - pre-checked to be greater than or equal to 0
552 jvmtiError
553 JvmtiEnv::SetEventCallbacks(const jvmtiEventCallbacks* callbacks, jint size_of_callbacks) {
554 JvmtiVTMSTransitionDisabler disabler;
555 JvmtiEventController::set_event_callbacks(this, callbacks, size_of_callbacks);
556 return JVMTI_ERROR_NONE;
557 } /* end SetEventCallbacks */
558
559
560 // event_thread - null is a valid value, must be checked
561 jvmtiError
562 JvmtiEnv::SetEventNotificationMode(jvmtiEventMode mode, jvmtiEvent event_type, jthread event_thread, ...) {
563 bool enabled = (mode == JVMTI_ENABLE);
564
565 // event_type must be valid
566 if (!JvmtiEventController::is_valid_event_type(event_type)) {
567 return JVMTI_ERROR_INVALID_EVENT_TYPE;
568 }
569
570 // assure that needed capabilities are present
571 if (enabled && !JvmtiUtil::has_event_capability(event_type, get_capabilities())) {
572 return JVMTI_ERROR_MUST_POSSESS_CAPABILITY;
573 }
574
575 if (event_type == JVMTI_EVENT_CLASS_FILE_LOAD_HOOK && enabled) {
576 record_class_file_load_hook_enabled();
577 }
578 JvmtiVTMSTransitionDisabler disabler;
579
580 if (event_thread == nullptr) {
581 // Can be called at Agent_OnLoad() time with event_thread == nullptr
582 // when Thread::current() does not work yet so we cannot create a
583 // ThreadsListHandle that is common to both thread-specific and
584 // global code paths.
585
586 JvmtiEventController::set_user_enabled(this, nullptr, (oop) nullptr, event_type, enabled);
587 } else {
588 // We have a specified event_thread.
589 JavaThread* current = JavaThread::current();
590 ThreadsListHandle tlh(current);
591
592 JavaThread* java_thread = nullptr;
593 oop thread_obj = nullptr;
594 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), event_thread, current, &java_thread, &thread_obj);
595 if (err != JVMTI_ERROR_NONE) {
596 return err;
597 }
598
599 // global events cannot be controlled at thread level.
600 if (JvmtiEventController::is_global_event(event_type)) {
601 return JVMTI_ERROR_ILLEGAL_ARGUMENT;
602 }
603
604 JvmtiEventController::set_user_enabled(this, java_thread, thread_obj, event_type, enabled);
605 }
606
607 return JVMTI_ERROR_NONE;
608 } /* end SetEventNotificationMode */
609
610 //
611 // Capability functions
612 //
613
614 // capabilities_ptr - pre-checked for null
615 jvmtiError
616 JvmtiEnv::GetPotentialCapabilities(jvmtiCapabilities* capabilities_ptr) {
617 JvmtiManageCapabilities::get_potential_capabilities(get_capabilities(),
618 get_prohibited_capabilities(),
619 capabilities_ptr);
620 return JVMTI_ERROR_NONE;
621 } /* end GetPotentialCapabilities */
622
623
624 // capabilities_ptr - pre-checked for null
625 jvmtiError
626 JvmtiEnv::AddCapabilities(const jvmtiCapabilities* capabilities_ptr) {
627 return JvmtiManageCapabilities::add_capabilities(get_capabilities(),
628 get_prohibited_capabilities(),
629 capabilities_ptr,
630 get_capabilities());
631 } /* end AddCapabilities */
632
633
634 // capabilities_ptr - pre-checked for null
635 jvmtiError
636 JvmtiEnv::RelinquishCapabilities(const jvmtiCapabilities* capabilities_ptr) {
637 JvmtiManageCapabilities::relinquish_capabilities(get_capabilities(), capabilities_ptr, get_capabilities());
638 return JVMTI_ERROR_NONE;
639 } /* end RelinquishCapabilities */
640
641
642 // capabilities_ptr - pre-checked for null
643 jvmtiError
644 JvmtiEnv::GetCapabilities(jvmtiCapabilities* capabilities_ptr) {
645 JvmtiManageCapabilities::copy_capabilities(get_capabilities(), capabilities_ptr);
646 return JVMTI_ERROR_NONE;
647 } /* end GetCapabilities */
648
649 //
650 // Class Loader Search functions
651 //
652
653 // segment - pre-checked for null
654 jvmtiError
655 JvmtiEnv::AddToBootstrapClassLoaderSearch(const char* segment) {
656 jvmtiPhase phase = get_phase();
657 if (phase == JVMTI_PHASE_ONLOAD) {
658 Arguments::append_sysclasspath(segment);
659 return JVMTI_ERROR_NONE;
660 } else if (use_version_1_0_semantics()) {
661 // This JvmtiEnv requested version 1.0 semantics and this function
662 // is only allowed in the ONLOAD phase in version 1.0 so we need to
663 // return an error here.
664 return JVMTI_ERROR_WRONG_PHASE;
665 } else if (phase == JVMTI_PHASE_LIVE) {
666 // The phase is checked by the wrapper that called this function,
667 // but this thread could be racing with the thread that is
668 // terminating the VM so we check one more time.
669
670 // create the zip entry
671 ClassPathZipEntry* zip_entry = ClassLoader::create_class_path_zip_entry(segment, true);
672 if (zip_entry == nullptr) {
673 return JVMTI_ERROR_ILLEGAL_ARGUMENT;
674 }
675
676 // add the jar file to the bootclasspath
677 log_info(class, load)("opened: %s", zip_entry->name());
678 #if INCLUDE_CDS
679 ClassLoaderExt::append_boot_classpath(zip_entry);
680 #else
681 ClassLoader::add_to_boot_append_entries(zip_entry);
682 #endif
683 return JVMTI_ERROR_NONE;
684 } else {
685 return JVMTI_ERROR_WRONG_PHASE;
686 }
687
688 } /* end AddToBootstrapClassLoaderSearch */
689
690
691 // segment - pre-checked for null
692 jvmtiError
693 JvmtiEnv::AddToSystemClassLoaderSearch(const char* segment) {
694 jvmtiPhase phase = get_phase();
695
696 if (phase == JVMTI_PHASE_ONLOAD) {
697 for (SystemProperty* p = Arguments::system_properties(); p != nullptr; p = p->next()) {
698 if (strcmp("java.class.path", p->key()) == 0) {
699 p->append_value(segment);
700 break;
701 }
702 }
703 return JVMTI_ERROR_NONE;
704 } else if (phase == JVMTI_PHASE_LIVE) {
705 // The phase is checked by the wrapper that called this function,
706 // but this thread could be racing with the thread that is
707 // terminating the VM so we check one more time.
708 JavaThread* THREAD = JavaThread::current(); // For exception macros.
709 HandleMark hm(THREAD);
710
711 // create the zip entry (which will open the zip file and hence
712 // check that the segment is indeed a zip file).
713 ClassPathZipEntry* zip_entry = ClassLoader::create_class_path_zip_entry(segment, false);
714 if (zip_entry == nullptr) {
715 return JVMTI_ERROR_ILLEGAL_ARGUMENT;
716 }
717 delete zip_entry; // no longer needed
718
719 Handle loader(THREAD, SystemDictionary::java_system_loader());
720
721 // need the path as java.lang.String
722 Handle path = java_lang_String::create_from_platform_dependent_str(segment, THREAD);
723 if (HAS_PENDING_EXCEPTION) {
724 CLEAR_PENDING_EXCEPTION;
725 return JVMTI_ERROR_INTERNAL;
726 }
727
728 // Invoke the appendToClassPathForInstrumentation method - if the method
729 // is not found it means the loader doesn't support adding to the class path
730 // in the live phase.
731 {
732 JavaValue res(T_VOID);
733 JavaCalls::call_special(&res,
734 loader,
735 loader->klass(),
736 vmSymbols::appendToClassPathForInstrumentation_name(),
737 vmSymbols::appendToClassPathForInstrumentation_signature(),
738 path,
739 THREAD);
740 if (HAS_PENDING_EXCEPTION) {
741 Symbol* ex_name = PENDING_EXCEPTION->klass()->name();
742 CLEAR_PENDING_EXCEPTION;
743
744 if (ex_name == vmSymbols::java_lang_NoSuchMethodError()) {
745 return JVMTI_ERROR_CLASS_LOADER_UNSUPPORTED;
746 } else {
747 return JVMTI_ERROR_INTERNAL;
748 }
749 }
750 }
751
752 return JVMTI_ERROR_NONE;
753 } else {
754 return JVMTI_ERROR_WRONG_PHASE;
755 }
756 } /* end AddToSystemClassLoaderSearch */
757
758 //
759 // General functions
760 //
761
762 // phase_ptr - pre-checked for null
763 jvmtiError
764 JvmtiEnv::GetPhase(jvmtiPhase* phase_ptr) {
765 *phase_ptr = phase();
766 return JVMTI_ERROR_NONE;
767 } /* end GetPhase */
768
769
770 jvmtiError
771 JvmtiEnv::DisposeEnvironment() {
772 dispose();
773 return JVMTI_ERROR_NONE;
774 } /* end DisposeEnvironment */
775
776
777 // data - null is a valid value, must be checked
778 jvmtiError
779 JvmtiEnv::SetEnvironmentLocalStorage(const void* data) {
780 set_env_local_storage(data);
781 return JVMTI_ERROR_NONE;
782 } /* end SetEnvironmentLocalStorage */
783
784
785 // data_ptr - pre-checked for null
786 jvmtiError
787 JvmtiEnv::GetEnvironmentLocalStorage(void** data_ptr) {
788 *data_ptr = (void*)get_env_local_storage();
789 return JVMTI_ERROR_NONE;
790 } /* end GetEnvironmentLocalStorage */
791
792 // version_ptr - pre-checked for null
793 jvmtiError
794 JvmtiEnv::GetVersionNumber(jint* version_ptr) {
795 *version_ptr = JVMTI_VERSION;
796 return JVMTI_ERROR_NONE;
797 } /* end GetVersionNumber */
798
799
800 // name_ptr - pre-checked for null
801 jvmtiError
802 JvmtiEnv::GetErrorName(jvmtiError error, char** name_ptr) {
803 if (error < JVMTI_ERROR_NONE || error > JVMTI_ERROR_MAX) {
804 return JVMTI_ERROR_ILLEGAL_ARGUMENT;
805 }
806 const char *name = JvmtiUtil::error_name(error);
807 if (name == nullptr) {
808 return JVMTI_ERROR_ILLEGAL_ARGUMENT;
809 }
810 size_t len = strlen(name) + 1;
811 jvmtiError err = allocate(len, (unsigned char**)name_ptr);
812 if (err == JVMTI_ERROR_NONE) {
813 memcpy(*name_ptr, name, len);
814 }
815 return err;
816 } /* end GetErrorName */
817
818
819 jvmtiError
820 JvmtiEnv::SetVerboseFlag(jvmtiVerboseFlag flag, jboolean value) {
821 LogLevelType level = value == 0 ? LogLevel::Off : LogLevel::Info;
822 switch (flag) {
823 case JVMTI_VERBOSE_OTHER:
824 // ignore
825 break;
826 case JVMTI_VERBOSE_CLASS:
827 LogConfiguration::configure_stdout(level, false, LOG_TAGS(class, unload));
828 LogConfiguration::configure_stdout(level, false, LOG_TAGS(class, load));
829 break;
830 case JVMTI_VERBOSE_GC:
831 LogConfiguration::configure_stdout(level, true, LOG_TAGS(gc));
832 break;
833 case JVMTI_VERBOSE_JNI:
834 level = value == 0 ? LogLevel::Off : LogLevel::Debug;
835 LogConfiguration::configure_stdout(level, true, LOG_TAGS(jni, resolve));
836 break;
837 default:
838 return JVMTI_ERROR_ILLEGAL_ARGUMENT;
839 };
840 return JVMTI_ERROR_NONE;
841 } /* end SetVerboseFlag */
842
843
844 // format_ptr - pre-checked for null
845 jvmtiError
846 JvmtiEnv::GetJLocationFormat(jvmtiJlocationFormat* format_ptr) {
847 *format_ptr = JVMTI_JLOCATION_JVMBCI;
848 return JVMTI_ERROR_NONE;
849 } /* end GetJLocationFormat */
850
851 //
852 // Thread functions
853 //
854
855 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
856 // thread_state_ptr - pre-checked for null
857 jvmtiError
858 JvmtiEnv::GetThreadState(jthread thread, jint* thread_state_ptr) {
859 JavaThread* current_thread = JavaThread::current();
860 JvmtiVTMSTransitionDisabler disabler(thread);
861 ThreadsListHandle tlh(current_thread);
862
863 JavaThread* java_thread = nullptr;
864 oop thread_oop = nullptr;
865 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, current_thread, &java_thread, &thread_oop);
866 if (err != JVMTI_ERROR_NONE && err != JVMTI_ERROR_THREAD_NOT_ALIVE) {
867 // We got an error code so we don't have a JavaThread*, but only
868 // return an error from here if the error is not because the thread
869 // is a virtual thread.
870 return err;
871 }
872 *thread_state_ptr = JvmtiEnvBase::get_thread_or_vthread_state(thread_oop, java_thread);
873 return JVMTI_ERROR_NONE;
874 } /* end GetThreadState */
875
876
877 // thread_ptr - pre-checked for null
878 jvmtiError
879 JvmtiEnv::GetCurrentThread(jthread* thread_ptr) {
880 JavaThread* cur_thread = JavaThread::current();
881 oop thread_oop = get_vthread_or_thread_oop(cur_thread);
882
883 *thread_ptr = (jthread)JNIHandles::make_local(cur_thread, thread_oop);
884 return JVMTI_ERROR_NONE;
885 } /* end GetCurrentThread */
886
887
888 // threads_count_ptr - pre-checked for null
889 // threads_ptr - pre-checked for null
890 jvmtiError
891 JvmtiEnv::GetAllThreads(jint* threads_count_ptr, jthread** threads_ptr) {
892 int nthreads = 0;
893 Handle *thread_objs = nullptr;
894 Thread* current_thread = Thread::current();
895 ResourceMark rm(current_thread);
896 HandleMark hm(current_thread);
897
898 // enumerate threads (including agent threads)
899 ThreadsListEnumerator tle(current_thread, true);
900 nthreads = tle.num_threads();
901 *threads_count_ptr = nthreads;
902
903 if (nthreads == 0) {
904 *threads_ptr = nullptr;
905 return JVMTI_ERROR_NONE;
906 }
907
908 thread_objs = NEW_RESOURCE_ARRAY(Handle, nthreads);
909 NULL_CHECK(thread_objs, JVMTI_ERROR_OUT_OF_MEMORY);
910
911 for (int i = 0; i < nthreads; i++) {
912 thread_objs[i] = Handle(tle.get_threadObj(i));
913 }
914
915 jthread *jthreads = new_jthreadArray(nthreads, thread_objs);
916 NULL_CHECK(jthreads, JVMTI_ERROR_OUT_OF_MEMORY);
917
918 *threads_ptr = jthreads;
919 return JVMTI_ERROR_NONE;
920 } /* end GetAllThreads */
921
922
923 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
924 jvmtiError
925 JvmtiEnv::SuspendThread(jthread thread) {
926 JavaThread* current = JavaThread::current();
927 HandleMark hm(current);
928 Handle self_tobj;
929
930 jvmtiError err;
931 {
932 JvmtiVTMSTransitionDisabler disabler(true);
933 ThreadsListHandle tlh(current);
934 JavaThread* java_thread = nullptr;
935 oop thread_oop = nullptr;
936
937 err = get_threadOop_and_JavaThread(tlh.list(), thread, current, &java_thread, &thread_oop);
938 if (err != JVMTI_ERROR_NONE) {
939 return err;
940 }
941
942 // Do not use JvmtiVTMSTransitionDisabler in context of self suspend to avoid deadlocks.
943 if (java_thread != current) {
944 err = suspend_thread(thread_oop, java_thread, /* single_suspend */ true, nullptr);
945 return err;
946 }
947 // protect thread_oop as a safepoint can be reached in disabler destructor
948 self_tobj = Handle(current, thread_oop);
949 }
950 // Do self suspend for current JavaThread.
951 err = suspend_thread(self_tobj(), current, /* single_suspend */ true, nullptr);
952 return err;
953 } /* end SuspendThread */
954
955
956 // request_count - pre-checked to be greater than or equal to 0
957 // request_list - pre-checked for null
958 // results - pre-checked for null
959 jvmtiError
960 JvmtiEnv::SuspendThreadList(jint request_count, const jthread* request_list, jvmtiError* results) {
961 JavaThread* current = JavaThread::current();
962 HandleMark hm(current);
963 Handle self_tobj;
964 int self_idx = -1;
965
966 {
967 JvmtiVTMSTransitionDisabler disabler(true);
968 ThreadsListHandle tlh(current);
969
970 for (int i = 0; i < request_count; i++) {
971 JavaThread *java_thread = nullptr;
972 oop thread_oop = nullptr;
973 jthread thread = request_list[i];
974 jvmtiError err = JvmtiExport::cv_external_thread_to_JavaThread(tlh.list(), thread, &java_thread, &thread_oop);
975
976 if (thread_oop != nullptr &&
977 java_lang_VirtualThread::is_instance(thread_oop) &&
978 !JvmtiEnvBase::is_vthread_alive(thread_oop)) {
979 err = JVMTI_ERROR_THREAD_NOT_ALIVE;
980 }
981 if (err != JVMTI_ERROR_NONE) {
982 if (thread_oop == nullptr || err != JVMTI_ERROR_INVALID_THREAD) {
983 results[i] = err;
984 continue;
985 }
986 }
987 if (java_thread == current) {
988 self_idx = i;
989 self_tobj = Handle(current, thread_oop);
990 continue; // self suspend after all other suspends
991 }
992 results[i] = suspend_thread(thread_oop, java_thread, /* single_suspend */ true, nullptr);
993 }
994 }
995 // Self suspend after all other suspends if necessary.
996 // Do not use JvmtiVTMSTransitionDisabler in context of self suspend to avoid deadlocks.
997 if (self_tobj() != nullptr) {
998 // there should not be any error for current java_thread
999 results[self_idx] = suspend_thread(self_tobj(), current, /* single_suspend */ true, nullptr);
1000 }
1001 // per-thread suspend results returned via results parameter
1002 return JVMTI_ERROR_NONE;
1003 } /* end SuspendThreadList */
1004
1005
1006 jvmtiError
1007 JvmtiEnv::SuspendAllVirtualThreads(jint except_count, const jthread* except_list) {
1008 if (get_capabilities()->can_support_virtual_threads == 0) {
1009 return JVMTI_ERROR_MUST_POSSESS_CAPABILITY;
1010 }
1011 JavaThread* current = JavaThread::current();
1012 HandleMark hm(current);
1013 Handle self_tobj;
1014
1015 {
1016 ResourceMark rm(current);
1017 JvmtiVTMSTransitionDisabler disabler(true);
1018 ThreadsListHandle tlh(current);
1019 GrowableArray<jthread>* elist = new GrowableArray<jthread>(except_count);
1020
1021 jvmtiError err = JvmtiEnvBase::check_thread_list(except_count, except_list);
1022 if (err != JVMTI_ERROR_NONE) {
1023 return err;
1024 }
1025
1026 // Collect threads from except_list for which resumed status must be restored (only for VirtualThread case)
1027 for (int idx = 0; idx < except_count; idx++) {
1028 jthread thread = except_list[idx];
1029 oop thread_oop = JNIHandles::resolve_external_guard(thread);
1030 if (java_lang_VirtualThread::is_instance(thread_oop) && !JvmtiVTSuspender::is_vthread_suspended(thread_oop)) {
1031 // is not suspended, so its resumed status must be restored
1032 elist->append(except_list[idx]);
1033 }
1034 }
1035
1036 for (JavaThreadIteratorWithHandle jtiwh; JavaThread *java_thread = jtiwh.next(); ) {
1037 oop vt_oop = java_thread->jvmti_vthread();
1038 if (!java_thread->is_exiting() &&
1039 !java_thread->is_jvmti_agent_thread() &&
1040 !java_thread->is_hidden_from_external_view() &&
1041 vt_oop != nullptr &&
1042 ((java_lang_VirtualThread::is_instance(vt_oop) &&
1043 JvmtiEnvBase::is_vthread_alive(vt_oop) &&
1044 !JvmtiVTSuspender::is_vthread_suspended(vt_oop)) ||
1045 (vt_oop->is_a(vmClasses::BoundVirtualThread_klass()) && !java_thread->is_suspended())) &&
1046 !is_in_thread_list(except_count, except_list, vt_oop)
1047 ) {
1048 if (java_thread == current) {
1049 self_tobj = Handle(current, vt_oop);
1050 continue; // self suspend after all other suspends
1051 }
1052 suspend_thread(vt_oop, java_thread, /* single_suspend */ false, nullptr);
1053 }
1054 }
1055 JvmtiVTSuspender::register_all_vthreads_suspend();
1056
1057 // Restore resumed state for threads from except list that were not suspended before.
1058 for (int idx = 0; idx < elist->length(); idx++) {
1059 jthread thread = elist->at(idx);
1060 oop thread_oop = JNIHandles::resolve_external_guard(thread);
1061 if (JvmtiVTSuspender::is_vthread_suspended(thread_oop)) {
1062 JvmtiVTSuspender::register_vthread_resume(thread_oop);
1063 }
1064 }
1065 }
1066 // Self suspend after all other suspends if necessary.
1067 // Do not use JvmtiVTMSTransitionDisabler in context of self suspend to avoid deadlocks.
1068 if (self_tobj() != nullptr) {
1069 suspend_thread(self_tobj(), current, /* single_suspend */ false, nullptr);
1070 }
1071 return JVMTI_ERROR_NONE;
1072 } /* end SuspendAllVirtualThreads */
1073
1074
1075 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
1076 jvmtiError
1077 JvmtiEnv::ResumeThread(jthread thread) {
1078 JvmtiVTMSTransitionDisabler disabler(true);
1079 JavaThread* current = JavaThread::current();
1080 ThreadsListHandle tlh(current);
1081
1082 JavaThread* java_thread = nullptr;
1083 oop thread_oop = nullptr;
1084 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, current, &java_thread, &thread_oop);
1085 if (err != JVMTI_ERROR_NONE) {
1086 return err;
1087 }
1088 err = resume_thread(thread_oop, java_thread, /* single_resume */ true);
1089 return err;
1090 } /* end ResumeThread */
1091
1092
1093 // request_count - pre-checked to be greater than or equal to 0
1094 // request_list - pre-checked for null
1095 // results - pre-checked for null
1096 jvmtiError
1097 JvmtiEnv::ResumeThreadList(jint request_count, const jthread* request_list, jvmtiError* results) {
1098 oop thread_oop = nullptr;
1099 JavaThread* java_thread = nullptr;
1100 JvmtiVTMSTransitionDisabler disabler(true);
1101 ThreadsListHandle tlh;
1102
1103 for (int i = 0; i < request_count; i++) {
1104 jthread thread = request_list[i];
1105 jvmtiError err = JvmtiExport::cv_external_thread_to_JavaThread(tlh.list(), thread, &java_thread, &thread_oop);
1106
1107 if (thread_oop != nullptr &&
1108 java_lang_VirtualThread::is_instance(thread_oop) &&
1109 !JvmtiEnvBase::is_vthread_alive(thread_oop)) {
1110 err = JVMTI_ERROR_THREAD_NOT_ALIVE;
1111 }
1112 if (err != JVMTI_ERROR_NONE) {
1113 if (thread_oop == nullptr || err != JVMTI_ERROR_INVALID_THREAD) {
1114 results[i] = err;
1115 continue;
1116 }
1117 }
1118 results[i] = resume_thread(thread_oop, java_thread, /* single_resume */ true);
1119 }
1120 // per-thread resume results returned via results parameter
1121 return JVMTI_ERROR_NONE;
1122 } /* end ResumeThreadList */
1123
1124
1125 jvmtiError
1126 JvmtiEnv::ResumeAllVirtualThreads(jint except_count, const jthread* except_list) {
1127 if (get_capabilities()->can_support_virtual_threads == 0) {
1128 return JVMTI_ERROR_MUST_POSSESS_CAPABILITY;
1129 }
1130 jvmtiError err = JvmtiEnvBase::check_thread_list(except_count, except_list);
1131 if (err != JVMTI_ERROR_NONE) {
1132 return err;
1133 }
1134 ResourceMark rm;
1135 JvmtiVTMSTransitionDisabler disabler(true);
1136 GrowableArray<jthread>* elist = new GrowableArray<jthread>(except_count);
1137
1138 // Collect threads from except_list for which suspended status must be restored (only for VirtualThread case)
1139 for (int idx = 0; idx < except_count; idx++) {
1140 jthread thread = except_list[idx];
1141 oop thread_oop = JNIHandles::resolve_external_guard(thread);
1142 if (java_lang_VirtualThread::is_instance(thread_oop) && JvmtiVTSuspender::is_vthread_suspended(thread_oop)) {
1143 // is suspended, so its suspended status must be restored
1144 elist->append(except_list[idx]);
1145 }
1146 }
1147
1148 for (JavaThreadIteratorWithHandle jtiwh; JavaThread *java_thread = jtiwh.next(); ) {
1149 oop vt_oop = java_thread->jvmti_vthread();
1150 if (!java_thread->is_exiting() &&
1151 !java_thread->is_jvmti_agent_thread() &&
1152 !java_thread->is_hidden_from_external_view() &&
1153 vt_oop != nullptr &&
1154 ((java_lang_VirtualThread::is_instance(vt_oop) &&
1155 JvmtiEnvBase::is_vthread_alive(vt_oop) &&
1156 JvmtiVTSuspender::is_vthread_suspended(vt_oop)) ||
1157 (vt_oop->is_a(vmClasses::BoundVirtualThread_klass()) && java_thread->is_suspended())) &&
1158 !is_in_thread_list(except_count, except_list, vt_oop)
1159 ) {
1160 resume_thread(vt_oop, java_thread, /* single_resume */ false);
1161 }
1162 }
1163 JvmtiVTSuspender::register_all_vthreads_resume();
1164
1165 // Restore suspended state for threads from except list that were suspended before.
1166 for (int idx = 0; idx < elist->length(); idx++) {
1167 jthread thread = elist->at(idx);
1168 oop thread_oop = JNIHandles::resolve_external_guard(thread);
1169 if (!JvmtiVTSuspender::is_vthread_suspended(thread_oop)) {
1170 JvmtiVTSuspender::register_vthread_suspend(thread_oop);
1171 }
1172 }
1173 return JVMTI_ERROR_NONE;
1174 } /* end ResumeAllVirtualThreads */
1175
1176
1177 jvmtiError
1178 JvmtiEnv::StopThread(jthread thread, jobject exception) {
1179 JavaThread* current_thread = JavaThread::current();
1180
1181 JvmtiVTMSTransitionDisabler disabler(thread);
1182 ThreadsListHandle tlh(current_thread);
1183 JavaThread* java_thread = nullptr;
1184 oop thread_oop = nullptr;
1185
1186 NULL_CHECK(thread, JVMTI_ERROR_INVALID_THREAD);
1187
1188 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, current_thread, &java_thread, &thread_oop);
1189
1190 bool is_virtual = thread_oop != nullptr && thread_oop->is_a(vmClasses::BaseVirtualThread_klass());
1191
1192 if (is_virtual && !is_JavaThread_current(java_thread, thread_oop)) {
1193 if (!is_vthread_suspended(thread_oop, java_thread)) {
1194 return JVMTI_ERROR_THREAD_NOT_SUSPENDED;
1195 }
1196 if (java_thread == nullptr) { // unmounted virtual thread
1197 return JVMTI_ERROR_OPAQUE_FRAME;
1198 }
1199 }
1200 if (err != JVMTI_ERROR_NONE) {
1201 return err;
1202 }
1203 oop e = JNIHandles::resolve_external_guard(exception);
1204 NULL_CHECK(e, JVMTI_ERROR_NULL_POINTER);
1205
1206 JavaThread::send_async_exception(java_thread, e);
1207
1208 return JVMTI_ERROR_NONE;
1209
1210 } /* end StopThread */
1211
1212
1213 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
1214 jvmtiError
1215 JvmtiEnv::InterruptThread(jthread thread) {
1216 JavaThread* current_thread = JavaThread::current();
1217 HandleMark hm(current_thread);
1218
1219 JvmtiVTMSTransitionDisabler disabler(thread);
1220 ThreadsListHandle tlh(current_thread);
1221
1222 JavaThread* java_thread = nullptr;
1223 oop thread_obj = nullptr;
1224 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, current_thread, &java_thread, &thread_obj);
1225 if (err != JVMTI_ERROR_NONE) {
1226 return err;
1227 }
1228
1229 if (java_lang_VirtualThread::is_instance(thread_obj)) {
1230 // For virtual threads we have to call into Java to interrupt:
1231 Handle obj(current_thread, thread_obj);
1232 JavaValue result(T_VOID);
1233 JavaCalls::call_virtual(&result,
1234 obj,
1235 vmClasses::Thread_klass(),
1236 vmSymbols::interrupt_method_name(),
1237 vmSymbols::void_method_signature(),
1238 current_thread);
1239
1240 return JVMTI_ERROR_NONE;
1241 }
1242
1243 // Really this should be a Java call to Thread.interrupt to ensure the same
1244 // semantics, however historically this has not been done for some reason.
1245 // So we continue with that (which means we don't interact with any Java-level
1246 // Interruptible object) but we must set the Java-level interrupted state.
1247 java_lang_Thread::set_interrupted(thread_obj, true);
1248 java_thread->interrupt();
1249
1250 return JVMTI_ERROR_NONE;
1251 } /* end InterruptThread */
1252
1253
1254 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
1255 // info_ptr - pre-checked for null
1256 jvmtiError
1257 JvmtiEnv::GetThreadInfo(jthread thread, jvmtiThreadInfo* info_ptr) {
1258 JavaThread* current_thread = JavaThread::current();
1259 ResourceMark rm(current_thread);
1260 HandleMark hm(current_thread);
1261 JavaThread* java_thread = nullptr;
1262 oop thread_oop = nullptr;
1263
1264 JvmtiVTMSTransitionDisabler disabler(thread);
1265 ThreadsListHandle tlh(current_thread);
1266
1267 // if thread is null the current thread is used
1268 if (thread == nullptr) {
1269 java_thread = JavaThread::current();
1270 thread_oop = get_vthread_or_thread_oop(java_thread);
1271 if (thread_oop == nullptr || !thread_oop->is_a(vmClasses::Thread_klass())) {
1272 return JVMTI_ERROR_INVALID_THREAD;
1273 }
1274 } else {
1275 jvmtiError err = JvmtiExport::cv_external_thread_to_JavaThread(tlh.list(), thread, &java_thread, &thread_oop);
1276 if (err != JVMTI_ERROR_NONE) {
1277 // We got an error code so we don't have a JavaThread *, but
1278 // only return an error from here if we didn't get a valid
1279 // thread_oop.
1280 // In the virtual thread case the cv_external_thread_to_JavaThread is expected to correctly set
1281 // the thread_oop and return JVMTI_ERROR_INVALID_THREAD which we ignore here.
1282 if (thread_oop == nullptr) {
1283 return err;
1284 }
1285 }
1286 }
1287 // We have a valid thread_oop so we can return some thread info.
1288
1289 Handle thread_obj(current_thread, thread_oop);
1290 Handle name;
1291 ThreadPriority priority;
1292 Handle thread_group;
1293 Handle context_class_loader;
1294 bool is_daemon;
1295
1296 name = Handle(current_thread, java_lang_Thread::name(thread_obj()));
1297
1298 if (java_lang_VirtualThread::is_instance(thread_obj())) {
1299 priority = (ThreadPriority)JVMTI_THREAD_NORM_PRIORITY;
1300 is_daemon = true;
1301 if (java_lang_VirtualThread::state(thread_obj()) == java_lang_VirtualThread::TERMINATED) {
1302 thread_group = Handle(current_thread, nullptr);
1303 } else {
1304 thread_group = Handle(current_thread, java_lang_Thread_Constants::get_VTHREAD_GROUP());
1305 }
1306 } else {
1307 priority = java_lang_Thread::priority(thread_obj());
1308 is_daemon = java_lang_Thread::is_daemon(thread_obj());
1309 if (java_lang_Thread::get_thread_status(thread_obj()) == JavaThreadStatus::TERMINATED) {
1310 thread_group = Handle(current_thread, nullptr);
1311 } else {
1312 thread_group = Handle(current_thread, java_lang_Thread::threadGroup(thread_obj()));
1313 }
1314 }
1315
1316 oop loader = java_lang_Thread::context_class_loader(thread_obj());
1317 context_class_loader = Handle(current_thread, loader);
1318
1319 { const char *n;
1320
1321 if (name() != nullptr) {
1322 n = java_lang_String::as_utf8_string(name());
1323 } else {
1324 int utf8_length = 0;
1325 n = UNICODE::as_utf8((jchar*) nullptr, utf8_length);
1326 }
1327
1328 info_ptr->name = (char *) jvmtiMalloc(strlen(n)+1);
1329 if (info_ptr->name == nullptr)
1330 return JVMTI_ERROR_OUT_OF_MEMORY;
1331
1332 strcpy(info_ptr->name, n);
1333 }
1334 info_ptr->is_daemon = is_daemon;
1335 info_ptr->priority = priority;
1336
1337 info_ptr->context_class_loader = (context_class_loader.is_null()) ? nullptr :
1338 jni_reference(context_class_loader);
1339 info_ptr->thread_group = jni_reference(thread_group);
1340
1341 return JVMTI_ERROR_NONE;
1342 } /* end GetThreadInfo */
1343
1344
1345 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
1346 // owned_monitor_count_ptr - pre-checked for null
1347 // owned_monitors_ptr - pre-checked for null
1348 jvmtiError
1349 JvmtiEnv::GetOwnedMonitorInfo(jthread thread, jint* owned_monitor_count_ptr, jobject** owned_monitors_ptr) {
1350 JavaThread* calling_thread = JavaThread::current();
1351 HandleMark hm(calling_thread);
1352
1353 // growable array of jvmti monitors info on the C-heap
1354 GrowableArray<jvmtiMonitorStackDepthInfo*> *owned_monitors_list =
1355 new (mtServiceability) GrowableArray<jvmtiMonitorStackDepthInfo*>(1, mtServiceability);
1356
1357 JvmtiVTMSTransitionDisabler disabler(thread);
1358 ThreadsListHandle tlh(calling_thread);
1359
1360 JavaThread* java_thread = nullptr;
1361 oop thread_oop = nullptr;
1362 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, calling_thread, &java_thread, &thread_oop);
1363 if (err != JVMTI_ERROR_NONE) {
1364 delete owned_monitors_list;
1365 return err;
1366 }
1367
1368 Handle thread_handle(calling_thread, thread_oop);
1369 EscapeBarrier eb(java_thread != nullptr, calling_thread, java_thread);
1370 if (!eb.deoptimize_objects(MaxJavaStackTraceDepth)) {
1371 delete owned_monitors_list;
1372 return JVMTI_ERROR_OUT_OF_MEMORY;
1373 }
1374 // get owned monitors info with handshake
1375 GetOwnedMonitorInfoClosure op(this, calling_thread, owned_monitors_list);
1376 JvmtiHandshake::execute(&op, &tlh, java_thread, thread_handle);
1377 err = op.result();
1378
1379 jint owned_monitor_count = owned_monitors_list->length();
1380 if (err == JVMTI_ERROR_NONE) {
1381 if ((err = allocate(owned_monitor_count * sizeof(jobject *),
1382 (unsigned char**)owned_monitors_ptr)) == JVMTI_ERROR_NONE) {
1383 // copy into the returned array
1384 for (int i = 0; i < owned_monitor_count; i++) {
1385 (*owned_monitors_ptr)[i] =
1386 ((jvmtiMonitorStackDepthInfo*)owned_monitors_list->at(i))->monitor;
1387 }
1388 *owned_monitor_count_ptr = owned_monitor_count;
1389 }
1390 }
1391 // clean up.
1392 for (int i = 0; i < owned_monitor_count; i++) {
1393 deallocate((unsigned char*)owned_monitors_list->at(i));
1394 }
1395 delete owned_monitors_list;
1396
1397 return err;
1398 } /* end GetOwnedMonitorInfo */
1399
1400
1401 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
1402 // monitor_info_count_ptr - pre-checked for null
1403 // monitor_info_ptr - pre-checked for null
1404 jvmtiError
1405 JvmtiEnv::GetOwnedMonitorStackDepthInfo(jthread thread, jint* monitor_info_count_ptr, jvmtiMonitorStackDepthInfo** monitor_info_ptr) {
1406 JavaThread* calling_thread = JavaThread::current();
1407 HandleMark hm(calling_thread);
1408
1409 // growable array of jvmti monitors info on the C-heap
1410 GrowableArray<jvmtiMonitorStackDepthInfo*> *owned_monitors_list =
1411 new (mtServiceability) GrowableArray<jvmtiMonitorStackDepthInfo*>(1, mtServiceability);
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 delete owned_monitors_list;
1421 return err;
1422 }
1423
1424 Handle thread_handle(calling_thread, thread_oop);
1425 EscapeBarrier eb(java_thread != nullptr, calling_thread, java_thread);
1426 if (!eb.deoptimize_objects(MaxJavaStackTraceDepth)) {
1427 delete owned_monitors_list;
1428 return JVMTI_ERROR_OUT_OF_MEMORY;
1429 }
1430 // get owned monitors info with handshake
1431 GetOwnedMonitorInfoClosure op(this, calling_thread, owned_monitors_list);
1432 JvmtiHandshake::execute(&op, &tlh, java_thread, thread_handle);
1433 err = op.result();
1434
1435 jint owned_monitor_count = owned_monitors_list->length();
1436 if (err == JVMTI_ERROR_NONE) {
1437 if ((err = allocate(owned_monitor_count * sizeof(jvmtiMonitorStackDepthInfo),
1438 (unsigned char**)monitor_info_ptr)) == JVMTI_ERROR_NONE) {
1439 // copy to output array.
1440 for (int i = 0; i < owned_monitor_count; i++) {
1441 (*monitor_info_ptr)[i].monitor =
1442 ((jvmtiMonitorStackDepthInfo*)owned_monitors_list->at(i))->monitor;
1443 (*monitor_info_ptr)[i].stack_depth =
1444 ((jvmtiMonitorStackDepthInfo*)owned_monitors_list->at(i))->stack_depth;
1445 }
1446 }
1447 *monitor_info_count_ptr = owned_monitor_count;
1448 }
1449
1450 // clean up.
1451 for (int i = 0; i < owned_monitor_count; i++) {
1452 deallocate((unsigned char*)owned_monitors_list->at(i));
1453 }
1454 delete owned_monitors_list;
1455
1456 return err;
1457 } /* end GetOwnedMonitorStackDepthInfo */
1458
1459
1460 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
1461 // monitor_ptr - pre-checked for null
1462 jvmtiError
1463 JvmtiEnv::GetCurrentContendedMonitor(jthread thread, jobject* monitor_ptr) {
1464 JavaThread* current = JavaThread::current();
1465
1466 *monitor_ptr = nullptr;
1467
1468 // get contended monitor information with handshake
1469 GetCurrentContendedMonitorClosure op(this, current, monitor_ptr);
1470 JvmtiHandshake::execute(&op, thread);
1471 return op.result();
1472 } /* end GetCurrentContendedMonitor */
1473
1474
1475 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
1476 // proc - pre-checked for null
1477 // arg - null is a valid value, must be checked
1478 jvmtiError
1479 JvmtiEnv::RunAgentThread(jthread thread, jvmtiStartFunction proc, const void* arg, jint priority) {
1480 JavaThread* current_thread = JavaThread::current();
1481
1482 JavaThread* java_thread = nullptr;
1483 oop thread_oop = nullptr;
1484 ThreadsListHandle tlh(current_thread);
1485 jvmtiError err = JvmtiExport::cv_external_thread_to_JavaThread(tlh.list(), thread, &java_thread, &thread_oop);
1486 if (err != JVMTI_ERROR_NONE) {
1487 // We got an error code so we don't have a JavaThread *, but
1488 // only return an error from here if we didn't get a valid
1489 // thread_oop.
1490 if (thread_oop == nullptr) {
1491 return err;
1492 }
1493 // We have a valid thread_oop.
1494 }
1495
1496 if (thread_oop->is_a(vmClasses::BaseVirtualThread_klass())) {
1497 // No support for virtual threads.
1498 return JVMTI_ERROR_UNSUPPORTED_OPERATION;
1499 }
1500 if (java_thread != nullptr) {
1501 // 'thread' refers to an existing JavaThread.
1502 return JVMTI_ERROR_INVALID_THREAD;
1503 }
1504
1505 if (priority < JVMTI_THREAD_MIN_PRIORITY || priority > JVMTI_THREAD_MAX_PRIORITY) {
1506 return JVMTI_ERROR_INVALID_PRIORITY;
1507 }
1508
1509 Handle thread_hndl(current_thread, thread_oop);
1510
1511 JvmtiAgentThread* new_thread = new JvmtiAgentThread(this, proc, arg);
1512
1513 // At this point it may be possible that no osthread was created for the
1514 // JavaThread due to lack of resources.
1515 if (new_thread->osthread() == nullptr) {
1516 // The new thread is not known to Thread-SMR yet so we can just delete.
1517 delete new_thread;
1518 return JVMTI_ERROR_OUT_OF_MEMORY;
1519 }
1520
1521 JavaThread::start_internal_daemon(current_thread, new_thread, thread_hndl,
1522 (ThreadPriority)priority);
1523
1524 return JVMTI_ERROR_NONE;
1525 } /* end RunAgentThread */
1526
1527 //
1528 // Thread Group functions
1529 //
1530
1531 // group_count_ptr - pre-checked for null
1532 // groups_ptr - pre-checked for null
1533 jvmtiError
1534 JvmtiEnv::GetTopThreadGroups(jint* group_count_ptr, jthreadGroup** groups_ptr) {
1535 JavaThread* current_thread = JavaThread::current();
1536
1537 // Only one top level thread group now.
1538 *group_count_ptr = 1;
1539
1540 // Allocate memory to store global-refs to the thread groups.
1541 // Assume this area is freed by caller.
1542 *groups_ptr = (jthreadGroup *) jvmtiMalloc((sizeof(jthreadGroup)) * (*group_count_ptr));
1543
1544 NULL_CHECK(*groups_ptr, JVMTI_ERROR_OUT_OF_MEMORY);
1545
1546 // Convert oop to Handle, then convert Handle to global-ref.
1547 {
1548 HandleMark hm(current_thread);
1549 Handle system_thread_group(current_thread, Universe::system_thread_group());
1550 *groups_ptr[0] = jni_reference(system_thread_group);
1551 }
1552
1553 return JVMTI_ERROR_NONE;
1554 } /* end GetTopThreadGroups */
1555
1556
1557 // info_ptr - pre-checked for null
1558 jvmtiError
1559 JvmtiEnv::GetThreadGroupInfo(jthreadGroup group, jvmtiThreadGroupInfo* info_ptr) {
1560 Thread* current_thread = Thread::current();
1561 ResourceMark rm(current_thread);
1562 HandleMark hm(current_thread);
1563
1564 Handle group_obj (current_thread, JNIHandles::resolve_external_guard(group));
1565 NULL_CHECK(group_obj(), JVMTI_ERROR_INVALID_THREAD_GROUP);
1566
1567 const char* name;
1568 Handle parent_group;
1569 bool is_daemon;
1570 ThreadPriority max_priority;
1571
1572 name = java_lang_ThreadGroup::name(group_obj());
1573 parent_group = Handle(current_thread, java_lang_ThreadGroup::parent(group_obj()));
1574 is_daemon = java_lang_ThreadGroup::is_daemon(group_obj());
1575 max_priority = java_lang_ThreadGroup::maxPriority(group_obj());
1576
1577 info_ptr->is_daemon = is_daemon;
1578 info_ptr->max_priority = max_priority;
1579 info_ptr->parent = jni_reference(parent_group);
1580
1581 if (name != nullptr) {
1582 info_ptr->name = (char*)jvmtiMalloc(strlen(name)+1);
1583 NULL_CHECK(info_ptr->name, JVMTI_ERROR_OUT_OF_MEMORY);
1584 strcpy(info_ptr->name, name);
1585 } else {
1586 info_ptr->name = nullptr;
1587 }
1588
1589 return JVMTI_ERROR_NONE;
1590 } /* end GetThreadGroupInfo */
1591
1592 // thread_count_ptr - pre-checked for null
1593 // threads_ptr - pre-checked for null
1594 // group_count_ptr - pre-checked for null
1595 // groups_ptr - pre-checked for null
1596 jvmtiError
1597 JvmtiEnv::GetThreadGroupChildren(jthreadGroup group, jint* thread_count_ptr, jthread** threads_ptr, jint* group_count_ptr, jthreadGroup** groups_ptr) {
1598 jvmtiError err;
1599 JavaThread* current_thread = JavaThread::current();
1600 oop group_obj = JNIHandles::resolve_external_guard(group);
1601 NULL_CHECK(group_obj, JVMTI_ERROR_INVALID_THREAD_GROUP);
1602
1603 Handle *thread_objs = nullptr;
1604 objArrayHandle group_objs;
1605 jint nthreads = 0;
1606 jint ngroups = 0;
1607 int hidden_threads = 0;
1608
1609 ResourceMark rm(current_thread);
1610 HandleMark hm(current_thread);
1611
1612 Handle group_hdl(current_thread, group_obj);
1613
1614 err = get_live_threads(current_thread, group_hdl, &nthreads, &thread_objs);
1615 if (err != JVMTI_ERROR_NONE) {
1616 return err;
1617 }
1618 err = get_subgroups(current_thread, group_hdl, &ngroups, &group_objs);
1619 if (err != JVMTI_ERROR_NONE) {
1620 return err;
1621 }
1622
1623 *group_count_ptr = ngroups;
1624 *thread_count_ptr = nthreads;
1625 *threads_ptr = new_jthreadArray(nthreads, thread_objs);
1626 *groups_ptr = new_jthreadGroupArray(ngroups, group_objs);
1627 if (nthreads > 0 && *threads_ptr == nullptr) {
1628 return JVMTI_ERROR_OUT_OF_MEMORY;
1629 }
1630 if (ngroups > 0 && *groups_ptr == nullptr) {
1631 return JVMTI_ERROR_OUT_OF_MEMORY;
1632 }
1633
1634 return JVMTI_ERROR_NONE;
1635 } /* end GetThreadGroupChildren */
1636
1637
1638 //
1639 // Stack Frame functions
1640 //
1641
1642 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
1643 // max_frame_count - pre-checked to be greater than or equal to 0
1644 // frame_buffer - pre-checked for null
1645 // count_ptr - pre-checked for null
1646 jvmtiError
1647 JvmtiEnv::GetStackTrace(jthread thread, jint start_depth, jint max_frame_count, jvmtiFrameInfo* frame_buffer, jint* count_ptr) {
1648 GetStackTraceClosure op(this, start_depth, max_frame_count, frame_buffer, count_ptr);
1649 JvmtiHandshake::execute(&op, thread);
1650 return op.result();
1651 } /* end GetStackTrace */
1652
1653
1654 // max_frame_count - pre-checked to be greater than or equal to 0
1655 // stack_info_ptr - pre-checked for null
1656 // thread_count_ptr - pre-checked for null
1657 jvmtiError
1658 JvmtiEnv::GetAllStackTraces(jint max_frame_count, jvmtiStackInfo** stack_info_ptr, jint* thread_count_ptr) {
1659 jvmtiError err = JVMTI_ERROR_NONE;
1660 JavaThread* calling_thread = JavaThread::current();
1661
1662 // JVMTI get stack traces at safepoint.
1663 VM_GetAllStackTraces op(this, calling_thread, max_frame_count);
1664 VMThread::execute(&op);
1665 *thread_count_ptr = op.final_thread_count();
1666 *stack_info_ptr = op.stack_info();
1667 err = op.result();
1668 return err;
1669 } /* end GetAllStackTraces */
1670
1671
1672 // thread_count - pre-checked to be greater than or equal to 0
1673 // thread_list - pre-checked for null
1674 // max_frame_count - pre-checked to be greater than or equal to 0
1675 // stack_info_ptr - pre-checked for null
1676 jvmtiError
1677 JvmtiEnv::GetThreadListStackTraces(jint thread_count, const jthread* thread_list, jint max_frame_count, jvmtiStackInfo** stack_info_ptr) {
1678 jvmtiError err = JVMTI_ERROR_NONE;
1679
1680 if (thread_count == 1) {
1681 // Use direct handshake if we need to get only one stack trace.
1682 JavaThread *current_thread = JavaThread::current();
1683
1684 jthread thread = thread_list[0];
1685
1686 GetSingleStackTraceClosure op(this, current_thread, thread, max_frame_count);
1687 JvmtiHandshake::execute(&op, thread);
1688 err = op.result();
1689 if (err == JVMTI_ERROR_NONE) {
1690 *stack_info_ptr = op.stack_info();
1691 }
1692 } else {
1693 JvmtiVTMSTransitionDisabler disabler;
1694
1695 // JVMTI get stack traces at safepoint.
1696 VM_GetThreadListStackTraces op(this, thread_count, thread_list, max_frame_count);
1697 VMThread::execute(&op);
1698 err = op.result();
1699 if (err == JVMTI_ERROR_NONE) {
1700 *stack_info_ptr = op.stack_info();
1701 }
1702 }
1703 return err;
1704 } /* end GetThreadListStackTraces */
1705
1706
1707 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
1708 // count_ptr - pre-checked for null
1709 jvmtiError
1710 JvmtiEnv::GetFrameCount(jthread thread, jint* count_ptr) {
1711 GetFrameCountClosure op(this, count_ptr);
1712 JvmtiHandshake::execute(&op, thread);
1713 return op.result();
1714 } /* end GetFrameCount */
1715
1716
1717 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
1718 jvmtiError
1719 JvmtiEnv::PopFrame(jthread thread) {
1720 JavaThread* current_thread = JavaThread::current();
1721 HandleMark hm(current_thread);
1722
1723 if (thread == nullptr) {
1724 return JVMTI_ERROR_INVALID_THREAD;
1725 }
1726 JvmtiVTMSTransitionDisabler disabler(thread);
1727 ThreadsListHandle tlh(current_thread);
1728
1729 JavaThread* java_thread = nullptr;
1730 oop thread_obj = nullptr;
1731 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, current_thread, &java_thread, &thread_obj);
1732 Handle thread_handle(current_thread, thread_obj);
1733
1734 if (err != JVMTI_ERROR_NONE) {
1735 return err;
1736 }
1737 bool self = java_thread == current_thread;
1738
1739 err = check_non_suspended_or_opaque_frame(java_thread, thread_obj, self);
1740 if (err != JVMTI_ERROR_NONE) {
1741 return err;
1742 }
1743
1744 // retrieve or create the state
1745 JvmtiThreadState* state = JvmtiThreadState::state_for(java_thread);
1746 if (state == nullptr) {
1747 return JVMTI_ERROR_THREAD_NOT_ALIVE;
1748 }
1749
1750 // Eagerly reallocate scalar replaced objects.
1751 EscapeBarrier eb(true, current_thread, java_thread);
1752 if (!eb.deoptimize_objects(1)) {
1753 // Reallocation of scalar replaced objects failed -> return with error
1754 return JVMTI_ERROR_OUT_OF_MEMORY;
1755 }
1756
1757 MutexLocker mu(JvmtiThreadState_lock);
1758 UpdateForPopTopFrameClosure op(state);
1759 JvmtiHandshake::execute(&op, &tlh, java_thread, thread_handle);
1760 return op.result();
1761 } /* end PopFrame */
1762
1763
1764 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
1765 // depth - pre-checked as non-negative
1766 // method_ptr - pre-checked for null
1767 // location_ptr - pre-checked for null
1768 jvmtiError
1769 JvmtiEnv::GetFrameLocation(jthread thread, jint depth, jmethodID* method_ptr, jlocation* location_ptr) {
1770 GetFrameLocationClosure op(this, depth, method_ptr, location_ptr);
1771 JvmtiHandshake::execute(&op, thread);
1772 return op.result();
1773 } /* end GetFrameLocation */
1774
1775
1776 // Threads_lock NOT held, java_thread not protected by lock
1777 // depth - pre-checked as non-negative
1778 jvmtiError
1779 JvmtiEnv::NotifyFramePop(jthread thread, jint depth) {
1780 ResourceMark rm;
1781 JvmtiVTMSTransitionDisabler disabler(thread);
1782 JavaThread* current = JavaThread::current();
1783 ThreadsListHandle tlh(current);
1784
1785 JavaThread* java_thread = nullptr;
1786 oop thread_obj = nullptr;
1787 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, current, &java_thread, &thread_obj);
1788 if (err != JVMTI_ERROR_NONE) {
1789 return err;
1790 }
1791
1792 HandleMark hm(current);
1793 Handle thread_handle(current, thread_obj);
1794 JvmtiThreadState *state = JvmtiThreadState::state_for(java_thread, thread_handle);
1795 if (state == nullptr) {
1796 return JVMTI_ERROR_THREAD_NOT_ALIVE;
1797 }
1798
1799 SetFramePopClosure op(this, state, depth);
1800 MutexLocker mu(current, JvmtiThreadState_lock);
1801 JvmtiHandshake::execute(&op, &tlh, java_thread, thread_handle);
1802 return op.result();
1803 } /* end NotifyFramePop */
1804
1805
1806 //
1807 // Force Early Return functions
1808 //
1809
1810 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
1811 jvmtiError
1812 JvmtiEnv::ForceEarlyReturnObject(jthread thread, jobject value) {
1813 jvalue val;
1814 val.l = value;
1815 return force_early_return(thread, val, atos);
1816 } /* end ForceEarlyReturnObject */
1817
1818
1819 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
1820 jvmtiError
1821 JvmtiEnv::ForceEarlyReturnInt(jthread thread, jint value) {
1822 jvalue val;
1823 val.i = value;
1824 return force_early_return(thread, val, itos);
1825 } /* end ForceEarlyReturnInt */
1826
1827
1828 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
1829 jvmtiError
1830 JvmtiEnv::ForceEarlyReturnLong(jthread thread, jlong value) {
1831 jvalue val;
1832 val.j = value;
1833 return force_early_return(thread, val, ltos);
1834 } /* end ForceEarlyReturnLong */
1835
1836
1837 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
1838 jvmtiError
1839 JvmtiEnv::ForceEarlyReturnFloat(jthread thread, jfloat value) {
1840 jvalue val;
1841 val.f = value;
1842 return force_early_return(thread, val, ftos);
1843 } /* end ForceEarlyReturnFloat */
1844
1845
1846 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
1847 jvmtiError
1848 JvmtiEnv::ForceEarlyReturnDouble(jthread thread, jdouble value) {
1849 jvalue val;
1850 val.d = value;
1851 return force_early_return(thread, val, dtos);
1852 } /* end ForceEarlyReturnDouble */
1853
1854
1855 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
1856 jvmtiError
1857 JvmtiEnv::ForceEarlyReturnVoid(jthread thread) {
1858 jvalue val;
1859 val.j = 0L;
1860 return force_early_return(thread, val, vtos);
1861 } /* end ForceEarlyReturnVoid */
1862
1863
1864 //
1865 // Heap functions
1866 //
1867
1868 // klass - null is a valid value, must be checked
1869 // initial_object - null is a valid value, must be checked
1870 // callbacks - pre-checked for null
1871 // user_data - null is a valid value, must be checked
1872 jvmtiError
1873 JvmtiEnv::FollowReferences(jint heap_filter, jclass klass, jobject initial_object, const jvmtiHeapCallbacks* callbacks, const void* user_data) {
1874 // check klass if provided
1875 Klass* k = nullptr;
1876 if (klass != nullptr) {
1877 oop k_mirror = JNIHandles::resolve_external_guard(klass);
1878 if (k_mirror == nullptr) {
1879 return JVMTI_ERROR_INVALID_CLASS;
1880 }
1881 if (java_lang_Class::is_primitive(k_mirror)) {
1882 return JVMTI_ERROR_NONE;
1883 }
1884 k = java_lang_Class::as_Klass(k_mirror);
1885 if (klass == nullptr) {
1886 return JVMTI_ERROR_INVALID_CLASS;
1887 }
1888 }
1889
1890 if (initial_object != nullptr) {
1891 oop init_obj = JNIHandles::resolve_external_guard(initial_object);
1892 if (init_obj == nullptr) {
1893 return JVMTI_ERROR_INVALID_OBJECT;
1894 }
1895 }
1896
1897 Thread *thread = Thread::current();
1898 HandleMark hm(thread);
1899
1900 TraceTime t("FollowReferences", TRACETIME_LOG(Debug, jvmti, objecttagging));
1901 JvmtiTagMap::tag_map_for(this)->follow_references(heap_filter, k, initial_object, callbacks, user_data);
1902 return JVMTI_ERROR_NONE;
1903 } /* end FollowReferences */
1904
1905
1906 // klass - null is a valid value, must be checked
1907 // callbacks - pre-checked for null
1908 // user_data - null is a valid value, must be checked
1909 jvmtiError
1910 JvmtiEnv::IterateThroughHeap(jint heap_filter, jclass klass, const jvmtiHeapCallbacks* callbacks, const void* user_data) {
1911 // check klass if provided
1912 Klass* k = nullptr;
1913 if (klass != nullptr) {
1914 oop k_mirror = JNIHandles::resolve_external_guard(klass);
1915 if (k_mirror == nullptr) {
1916 return JVMTI_ERROR_INVALID_CLASS;
1917 }
1918 if (java_lang_Class::is_primitive(k_mirror)) {
1919 return JVMTI_ERROR_NONE;
1920 }
1921 k = java_lang_Class::as_Klass(k_mirror);
1922 if (k == nullptr) {
1923 return JVMTI_ERROR_INVALID_CLASS;
1924 }
1925 }
1926
1927 TraceTime t("IterateThroughHeap", TRACETIME_LOG(Debug, jvmti, objecttagging));
1928 JvmtiTagMap::tag_map_for(this)->iterate_through_heap(heap_filter, k, callbacks, user_data);
1929 return JVMTI_ERROR_NONE;
1930 } /* end IterateThroughHeap */
1931
1932
1933 // tag_ptr - pre-checked for null
1934 jvmtiError
1935 JvmtiEnv::GetTag(jobject object, jlong* tag_ptr) {
1936 oop o = JNIHandles::resolve_external_guard(object);
1937 NULL_CHECK(o, JVMTI_ERROR_INVALID_OBJECT);
1938 *tag_ptr = JvmtiTagMap::tag_map_for(this)->get_tag(object);
1939 return JVMTI_ERROR_NONE;
1940 } /* end GetTag */
1941
1942
1943 jvmtiError
1944 JvmtiEnv::SetTag(jobject object, jlong tag) {
1945 oop o = JNIHandles::resolve_external_guard(object);
1946 NULL_CHECK(o, JVMTI_ERROR_INVALID_OBJECT);
1947 JvmtiTagMap::tag_map_for(this)->set_tag(object, tag);
1948 return JVMTI_ERROR_NONE;
1949 } /* end SetTag */
1950
1951
1952 // tag_count - pre-checked to be greater than or equal to 0
1953 // tags - pre-checked for null
1954 // count_ptr - pre-checked for null
1955 // object_result_ptr - null is a valid value, must be checked
1956 // tag_result_ptr - null is a valid value, must be checked
1957 jvmtiError
1958 JvmtiEnv::GetObjectsWithTags(jint tag_count, const jlong* tags, jint* count_ptr, jobject** object_result_ptr, jlong** tag_result_ptr) {
1959 TraceTime t("GetObjectsWithTags", TRACETIME_LOG(Debug, jvmti, objecttagging));
1960 return JvmtiTagMap::tag_map_for(this)->get_objects_with_tags((jlong*)tags, tag_count, count_ptr, object_result_ptr, tag_result_ptr);
1961 } /* end GetObjectsWithTags */
1962
1963
1964 jvmtiError
1965 JvmtiEnv::ForceGarbageCollection() {
1966 Universe::heap()->collect(GCCause::_jvmti_force_gc);
1967 return JVMTI_ERROR_NONE;
1968 } /* end ForceGarbageCollection */
1969
1970
1971 //
1972 // Heap (1.0) functions
1973 //
1974
1975 // object_reference_callback - pre-checked for null
1976 // user_data - null is a valid value, must be checked
1977 jvmtiError
1978 JvmtiEnv::IterateOverObjectsReachableFromObject(jobject object, jvmtiObjectReferenceCallback object_reference_callback, const void* user_data) {
1979 oop o = JNIHandles::resolve_external_guard(object);
1980 NULL_CHECK(o, JVMTI_ERROR_INVALID_OBJECT);
1981 JvmtiTagMap::tag_map_for(this)->iterate_over_objects_reachable_from_object(object, object_reference_callback, user_data);
1982 return JVMTI_ERROR_NONE;
1983 } /* end IterateOverObjectsReachableFromObject */
1984
1985
1986 // heap_root_callback - null is a valid value, must be checked
1987 // stack_ref_callback - null is a valid value, must be checked
1988 // object_ref_callback - null is a valid value, must be checked
1989 // user_data - null is a valid value, must be checked
1990 jvmtiError
1991 JvmtiEnv::IterateOverReachableObjects(jvmtiHeapRootCallback heap_root_callback, jvmtiStackReferenceCallback stack_ref_callback, jvmtiObjectReferenceCallback object_ref_callback, const void* user_data) {
1992 TraceTime t("IterateOverReachableObjects", TRACETIME_LOG(Debug, jvmti, objecttagging));
1993 JvmtiTagMap::tag_map_for(this)->iterate_over_reachable_objects(heap_root_callback, stack_ref_callback, object_ref_callback, user_data);
1994 return JVMTI_ERROR_NONE;
1995 } /* end IterateOverReachableObjects */
1996
1997
1998 // heap_object_callback - pre-checked for null
1999 // user_data - null is a valid value, must be checked
2000 jvmtiError
2001 JvmtiEnv::IterateOverHeap(jvmtiHeapObjectFilter object_filter, jvmtiHeapObjectCallback heap_object_callback, const void* user_data) {
2002 TraceTime t("IterateOverHeap", TRACETIME_LOG(Debug, jvmti, objecttagging));
2003 Thread *thread = Thread::current();
2004 HandleMark hm(thread);
2005 JvmtiTagMap::tag_map_for(this)->iterate_over_heap(object_filter, nullptr, heap_object_callback, user_data);
2006 return JVMTI_ERROR_NONE;
2007 } /* end IterateOverHeap */
2008
2009
2010 // k_mirror - may be primitive, this must be checked
2011 // heap_object_callback - pre-checked for null
2012 // user_data - null is a valid value, must be checked
2013 jvmtiError
2014 JvmtiEnv::IterateOverInstancesOfClass(oop k_mirror, jvmtiHeapObjectFilter object_filter, jvmtiHeapObjectCallback heap_object_callback, const void* user_data) {
2015 if (java_lang_Class::is_primitive(k_mirror)) {
2016 // DO PRIMITIVE CLASS PROCESSING
2017 return JVMTI_ERROR_NONE;
2018 }
2019 Klass* klass = java_lang_Class::as_Klass(k_mirror);
2020 if (klass == nullptr) {
2021 return JVMTI_ERROR_INVALID_CLASS;
2022 }
2023 TraceTime t("IterateOverInstancesOfClass", TRACETIME_LOG(Debug, jvmti, objecttagging));
2024 JvmtiTagMap::tag_map_for(this)->iterate_over_heap(object_filter, klass, heap_object_callback, user_data);
2025 return JVMTI_ERROR_NONE;
2026 } /* end IterateOverInstancesOfClass */
2027
2028
2029 //
2030 // Local Variable functions
2031 //
2032
2033 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
2034 // depth - pre-checked as non-negative
2035 // value_ptr - pre-checked for null
2036 jvmtiError
2037 JvmtiEnv::GetLocalObject(jthread thread, jint depth, jint slot, jobject* value_ptr) {
2038 JavaThread* current_thread = JavaThread::current();
2039 // rm object is created to clean up the javaVFrame created in
2040 // doit_prologue(), but after doit() is finished with it.
2041 ResourceMark rm(current_thread);
2042 HandleMark hm(current_thread);
2043 JvmtiVTMSTransitionDisabler disabler(thread);
2044 ThreadsListHandle tlh(current_thread);
2045
2046 JavaThread* java_thread = nullptr;
2047 oop thread_obj = nullptr;
2048 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, current_thread, &java_thread, &thread_obj);
2049 if (err != JVMTI_ERROR_NONE) {
2050 return err;
2051 }
2052 bool self = is_JavaThread_current(java_thread, thread_obj);
2053
2054 if (java_lang_VirtualThread::is_instance(thread_obj)) {
2055 VM_VirtualThreadGetOrSetLocal op(this, Handle(current_thread, thread_obj),
2056 current_thread, depth, slot, self);
2057 VMThread::execute(&op);
2058 err = op.result();
2059 if (err == JVMTI_ERROR_NONE) {
2060 *value_ptr = op.value().l;
2061 }
2062 } else {
2063 // Support for ordinary threads
2064 VM_GetOrSetLocal op(java_thread, 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 }
2071 return err;
2072 } /* end GetLocalObject */
2073
2074 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
2075 // depth - pre-checked as non-negative
2076 // value - pre-checked for null
2077 jvmtiError
2078 JvmtiEnv::GetLocalInstance(jthread thread, jint depth, jobject* value_ptr){
2079 JavaThread* current_thread = JavaThread::current();
2080 // rm object is created to clean up the javaVFrame created in
2081 // doit_prologue(), but after doit() is finished with it.
2082 ResourceMark rm(current_thread);
2083 HandleMark hm(current_thread);
2084 JvmtiVTMSTransitionDisabler disabler(thread);
2085 ThreadsListHandle tlh(current_thread);
2086
2087 JavaThread* java_thread = nullptr;
2088 oop thread_obj = nullptr;
2089 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, current_thread, &java_thread, &thread_obj);
2090 if (err != JVMTI_ERROR_NONE) {
2091 return err;
2092 }
2093 bool self = is_JavaThread_current(java_thread, thread_obj);
2094
2095 if (java_lang_VirtualThread::is_instance(thread_obj)) {
2096 VM_VirtualThreadGetReceiver op(this, Handle(current_thread, thread_obj),
2097 current_thread, depth, self);
2098 VMThread::execute(&op);
2099 err = op.result();
2100 if (err == JVMTI_ERROR_NONE) {
2101 *value_ptr = op.value().l;
2102 }
2103 } else {
2104 // Support for ordinary threads
2105 VM_GetReceiver op(java_thread, 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 }
2112 return err;
2113 } /* end GetLocalInstance */
2114
2115
2116 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
2117 // depth - pre-checked as non-negative
2118 // value_ptr - pre-checked for null
2119 jvmtiError
2120 JvmtiEnv::GetLocalInt(jthread thread, jint depth, jint slot, jint* value_ptr) {
2121 JavaThread* current_thread = JavaThread::current();
2122 // rm object is created to clean up the javaVFrame created in
2123 // doit_prologue(), but after doit() is finished with it.
2124 ResourceMark rm(current_thread);
2125 HandleMark hm(current_thread);
2126 JvmtiVTMSTransitionDisabler disabler(thread);
2127 ThreadsListHandle tlh(current_thread);
2128
2129 JavaThread* java_thread = nullptr;
2130 oop thread_obj = nullptr;
2131 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, current_thread, &java_thread, &thread_obj);
2132 if (err != JVMTI_ERROR_NONE) {
2133 return err;
2134 }
2135 bool self = is_JavaThread_current(java_thread, thread_obj);
2136
2137 if (java_lang_VirtualThread::is_instance(thread_obj)) {
2138 VM_VirtualThreadGetOrSetLocal op(this, Handle(current_thread, thread_obj),
2139 depth, slot, T_INT, self);
2140 VMThread::execute(&op);
2141 err = op.result();
2142 if (err == JVMTI_ERROR_NONE) {
2143 *value_ptr = op.value().i;
2144 }
2145 } else {
2146 // Support for ordinary threads
2147 VM_GetOrSetLocal op(java_thread, 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 }
2154 return err;
2155 } /* end GetLocalInt */
2156
2157
2158 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
2159 // depth - pre-checked as non-negative
2160 // value_ptr - pre-checked for null
2161 jvmtiError
2162 JvmtiEnv::GetLocalLong(jthread thread, jint depth, jint slot, jlong* value_ptr) {
2163 JavaThread* current_thread = JavaThread::current();
2164 // rm object is created to clean up the javaVFrame created in
2165 // doit_prologue(), but after doit() is finished with it.
2166 ResourceMark rm(current_thread);
2167 HandleMark hm(current_thread);
2168 JvmtiVTMSTransitionDisabler disabler(thread);
2169 ThreadsListHandle tlh(current_thread);
2170
2171 JavaThread* java_thread = nullptr;
2172 oop thread_obj = nullptr;
2173 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, current_thread, &java_thread, &thread_obj);
2174 if (err != JVMTI_ERROR_NONE) {
2175 return err;
2176 }
2177 bool self = is_JavaThread_current(java_thread, thread_obj);
2178
2179 if (java_lang_VirtualThread::is_instance(thread_obj)) {
2180 VM_VirtualThreadGetOrSetLocal op(this, Handle(current_thread, thread_obj),
2181 depth, slot, T_LONG, self);
2182 VMThread::execute(&op);
2183 err = op.result();
2184 if (err == JVMTI_ERROR_NONE) {
2185 *value_ptr = op.value().j;
2186 }
2187 } else {
2188 // Support for ordinary threads
2189 VM_GetOrSetLocal op(java_thread, 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 }
2196 return err;
2197 } /* end GetLocalLong */
2198
2199
2200 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
2201 // depth - pre-checked as non-negative
2202 // value_ptr - pre-checked for null
2203 jvmtiError
2204 JvmtiEnv::GetLocalFloat(jthread thread, jint depth, jint slot, jfloat* value_ptr) {
2205 JavaThread* current_thread = JavaThread::current();
2206 // rm object is created to clean up the javaVFrame created in
2207 // doit_prologue(), but after doit() is finished with it.
2208 ResourceMark rm(current_thread);
2209 HandleMark hm(current_thread);
2210 JvmtiVTMSTransitionDisabler disabler(thread);
2211 ThreadsListHandle tlh(current_thread);
2212
2213 JavaThread* java_thread = nullptr;
2214 oop thread_obj = nullptr;
2215 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, current_thread, &java_thread, &thread_obj);
2216 if (err != JVMTI_ERROR_NONE) {
2217 return err;
2218 }
2219 bool self = is_JavaThread_current(java_thread, thread_obj);
2220
2221 if (java_lang_VirtualThread::is_instance(thread_obj)) {
2222 VM_VirtualThreadGetOrSetLocal op(this, Handle(current_thread, thread_obj),
2223 depth, slot, T_FLOAT, self);
2224 VMThread::execute(&op);
2225 err = op.result();
2226 if (err == JVMTI_ERROR_NONE) {
2227 *value_ptr = op.value().f;
2228 }
2229 } else {
2230 // Support for ordinary threads
2231 VM_GetOrSetLocal op(java_thread, 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 }
2238 return err;
2239 } /* end GetLocalFloat */
2240
2241
2242 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
2243 // depth - pre-checked as non-negative
2244 // value_ptr - pre-checked for null
2245 jvmtiError
2246 JvmtiEnv::GetLocalDouble(jthread thread, jint depth, jint slot, jdouble* value_ptr) {
2247 JavaThread* current_thread = JavaThread::current();
2248 // rm object is created to clean up the javaVFrame created in
2249 // doit_prologue(), but after doit() is finished with it.
2250 ResourceMark rm(current_thread);
2251 HandleMark hm(current_thread);
2252 JvmtiVTMSTransitionDisabler disabler(thread);
2253 ThreadsListHandle tlh(current_thread);
2254
2255 JavaThread* java_thread = nullptr;
2256 oop thread_obj = nullptr;
2257 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, current_thread, &java_thread, &thread_obj);
2258 if (err != JVMTI_ERROR_NONE) {
2259 return err;
2260 }
2261 bool self = is_JavaThread_current(java_thread, thread_obj);
2262
2263 if (java_lang_VirtualThread::is_instance(thread_obj)) {
2264 VM_VirtualThreadGetOrSetLocal op(this, Handle(current_thread, thread_obj),
2265 depth, slot, T_DOUBLE, self);
2266 VMThread::execute(&op);
2267 err = op.result();
2268 if (err == JVMTI_ERROR_NONE) {
2269 *value_ptr = op.value().d;
2270 }
2271 } else {
2272 // Support for ordinary threads
2273 VM_GetOrSetLocal op(java_thread, 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 }
2280 return err;
2281 } /* end GetLocalDouble */
2282
2283
2284 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
2285 // depth - pre-checked as non-negative
2286 jvmtiError
2287 JvmtiEnv::SetLocalObject(jthread thread, jint depth, jint slot, jobject value) {
2288 JavaThread* current_thread = JavaThread::current();
2289 // rm object is created to clean up the javaVFrame created in
2290 // doit_prologue(), but after doit() is finished with it.
2291 ResourceMark rm(current_thread);
2292 HandleMark hm(current_thread);
2293 JvmtiVTMSTransitionDisabler disabler(thread);
2294 ThreadsListHandle tlh(current_thread);
2295
2296 JavaThread* java_thread = nullptr;
2297 oop thread_obj = nullptr;
2298 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, current_thread, &java_thread, &thread_obj);
2299 if (err != JVMTI_ERROR_NONE) {
2300 return err;
2301 }
2302 bool self = is_JavaThread_current(java_thread, thread_obj);
2303 jvalue val;
2304 val.l = value;
2305
2306 if (java_lang_VirtualThread::is_instance(thread_obj)) {
2307 VM_VirtualThreadGetOrSetLocal op(this, Handle(current_thread, thread_obj),
2308 depth, slot, T_OBJECT, val, self);
2309 VMThread::execute(&op);
2310 err = op.result();
2311 } else {
2312 // Support for ordinary threads
2313 VM_GetOrSetLocal op(java_thread, depth, slot, T_OBJECT, val, self);
2314 VMThread::execute(&op);
2315 err = op.result();
2316 }
2317 return err;
2318 } /* end SetLocalObject */
2319
2320
2321 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
2322 // depth - pre-checked as non-negative
2323 jvmtiError
2324 JvmtiEnv::SetLocalInt(jthread thread, jint depth, jint slot, jint value) {
2325 JavaThread* current_thread = JavaThread::current();
2326 // rm object is created to clean up the javaVFrame created in
2327 // doit_prologue(), but after doit() is finished with it.
2328 ResourceMark rm(current_thread);
2329 HandleMark hm(current_thread);
2330 JvmtiVTMSTransitionDisabler disabler(thread);
2331 ThreadsListHandle tlh(current_thread);
2332
2333 JavaThread* java_thread = nullptr;
2334 oop thread_obj = nullptr;
2335 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, current_thread, &java_thread, &thread_obj);
2336 if (err != JVMTI_ERROR_NONE) {
2337 return err;
2338 }
2339 bool self = is_JavaThread_current(java_thread, thread_obj);
2340 jvalue val;
2341 val.i = value;
2342
2343 if (java_lang_VirtualThread::is_instance(thread_obj)) {
2344 VM_VirtualThreadGetOrSetLocal op(this, Handle(current_thread, thread_obj),
2345 depth, slot, T_INT, val, self);
2346 VMThread::execute(&op);
2347 err = op.result();
2348 } else {
2349 // Support for ordinary threads
2350 VM_GetOrSetLocal op(java_thread, depth, slot, T_INT, val, self);
2351 VMThread::execute(&op);
2352 err = op.result();
2353 }
2354 return err;
2355 } /* end SetLocalInt */
2356
2357
2358 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
2359 // depth - pre-checked as non-negative
2360 jvmtiError
2361 JvmtiEnv::SetLocalLong(jthread thread, jint depth, jint slot, jlong value) {
2362 JavaThread* current_thread = JavaThread::current();
2363 // rm object is created to clean up the javaVFrame created in
2364 // doit_prologue(), but after doit() is finished with it.
2365 ResourceMark rm(current_thread);
2366 HandleMark hm(current_thread);
2367 JvmtiVTMSTransitionDisabler disabler(thread);
2368 ThreadsListHandle tlh(current_thread);
2369
2370 JavaThread* java_thread = nullptr;
2371 oop thread_obj = nullptr;
2372 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, current_thread, &java_thread, &thread_obj);
2373 if (err != JVMTI_ERROR_NONE) {
2374 return err;
2375 }
2376 bool self = is_JavaThread_current(java_thread, thread_obj);
2377 jvalue val;
2378 val.j = value;
2379
2380 if (java_lang_VirtualThread::is_instance(thread_obj)) {
2381 VM_VirtualThreadGetOrSetLocal op(this, Handle(current_thread, thread_obj),
2382 depth, slot, T_LONG, val, self);
2383 VMThread::execute(&op);
2384 err = op.result();
2385 } else {
2386 // Support for ordinary threads
2387 VM_GetOrSetLocal op(java_thread, depth, slot, T_LONG, val, self);
2388 VMThread::execute(&op);
2389 err = op.result();
2390 }
2391 return err;
2392 } /* end SetLocalLong */
2393
2394
2395 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
2396 // depth - pre-checked as non-negative
2397 jvmtiError
2398 JvmtiEnv::SetLocalFloat(jthread thread, jint depth, jint slot, jfloat value) {
2399 JavaThread* current_thread = JavaThread::current();
2400 // rm object is created to clean up the javaVFrame created in
2401 // doit_prologue(), but after doit() is finished with it.
2402 ResourceMark rm(current_thread);
2403 HandleMark hm(current_thread);
2404 JvmtiVTMSTransitionDisabler disabler(thread);
2405 ThreadsListHandle tlh(current_thread);
2406
2407 JavaThread* java_thread = nullptr;
2408 oop thread_obj = nullptr;
2409 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, current_thread, &java_thread, &thread_obj);
2410 if (err != JVMTI_ERROR_NONE) {
2411 return err;
2412 }
2413 bool self = is_JavaThread_current(java_thread, thread_obj);
2414 jvalue val;
2415 val.f = value;
2416
2417 if (java_lang_VirtualThread::is_instance(thread_obj)) {
2418 VM_VirtualThreadGetOrSetLocal op(this, Handle(current_thread, thread_obj),
2419 depth, slot, T_FLOAT, val, self);
2420 VMThread::execute(&op);
2421 err = op.result();
2422 } else {
2423 // Support for ordinary threads
2424 VM_GetOrSetLocal op(java_thread, depth, slot, T_FLOAT, val, self);
2425 VMThread::execute(&op);
2426 err = op.result();
2427 }
2428 return err;
2429 } /* end SetLocalFloat */
2430
2431
2432 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
2433 // depth - pre-checked as non-negative
2434 jvmtiError
2435 JvmtiEnv::SetLocalDouble(jthread thread, jint depth, jint slot, jdouble value) {
2436 JavaThread* current_thread = JavaThread::current();
2437 // rm object is created to clean up the javaVFrame created in
2438 // doit_prologue(), but after doit() is finished with it.
2439 ResourceMark rm(current_thread);
2440 HandleMark hm(current_thread);
2441 JvmtiVTMSTransitionDisabler disabler(thread);
2442 ThreadsListHandle tlh(current_thread);
2443
2444 JavaThread* java_thread = nullptr;
2445 oop thread_obj = nullptr;
2446 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, current_thread, &java_thread, &thread_obj);
2447 if (err != JVMTI_ERROR_NONE) {
2448 return err;
2449 }
2450 bool self = is_JavaThread_current(java_thread, thread_obj);
2451 jvalue val;
2452 val.d = value;
2453
2454 if (java_lang_VirtualThread::is_instance(thread_obj)) {
2455 VM_VirtualThreadGetOrSetLocal op(this, Handle(current_thread, thread_obj),
2456 depth, slot, T_DOUBLE, val, self);
2457 VMThread::execute(&op);
2458 err = op.result();
2459 } else {
2460 // Support for ordinary threads
2461 VM_GetOrSetLocal op(java_thread, depth, slot, T_DOUBLE, val, self);
2462 VMThread::execute(&op);
2463 err = op.result();
2464 }
2465 return err;
2466 } /* end SetLocalDouble */
2467
2468
2469 //
2470 // Breakpoint functions
2471 //
2472
2473 // method - pre-checked for validity, but may be null meaning obsolete method
2474 jvmtiError
2475 JvmtiEnv::SetBreakpoint(Method* method, jlocation location) {
2476 NULL_CHECK(method, JVMTI_ERROR_INVALID_METHODID);
2477 if (location < 0) { // simple invalid location check first
2478 return JVMTI_ERROR_INVALID_LOCATION;
2479 }
2480 // verify that the breakpoint is not past the end of the method
2481 if (location >= (jlocation) method->code_size()) {
2482 return JVMTI_ERROR_INVALID_LOCATION;
2483 }
2484
2485 ResourceMark rm;
2486 JvmtiBreakpoint bp(method, location);
2487 JvmtiBreakpoints& jvmti_breakpoints = JvmtiCurrentBreakpoints::get_jvmti_breakpoints();
2488 if (jvmti_breakpoints.set(bp) == JVMTI_ERROR_DUPLICATE)
2489 return JVMTI_ERROR_DUPLICATE;
2490
2491 if (TraceJVMTICalls) {
2492 jvmti_breakpoints.print();
2493 }
2494
2495 return JVMTI_ERROR_NONE;
2496 } /* end SetBreakpoint */
2497
2498
2499 // method - pre-checked for validity, but may be null meaning obsolete method
2500 jvmtiError
2501 JvmtiEnv::ClearBreakpoint(Method* method, jlocation location) {
2502 NULL_CHECK(method, JVMTI_ERROR_INVALID_METHODID);
2503
2504 if (location < 0) { // simple invalid location check first
2505 return JVMTI_ERROR_INVALID_LOCATION;
2506 }
2507
2508 // verify that the breakpoint is not past the end of the method
2509 if (location >= (jlocation) method->code_size()) {
2510 return JVMTI_ERROR_INVALID_LOCATION;
2511 }
2512
2513 JvmtiBreakpoint bp(method, location);
2514
2515 JvmtiBreakpoints& jvmti_breakpoints = JvmtiCurrentBreakpoints::get_jvmti_breakpoints();
2516 if (jvmti_breakpoints.clear(bp) == JVMTI_ERROR_NOT_FOUND)
2517 return JVMTI_ERROR_NOT_FOUND;
2518
2519 if (TraceJVMTICalls) {
2520 jvmti_breakpoints.print();
2521 }
2522
2523 return JVMTI_ERROR_NONE;
2524 } /* end ClearBreakpoint */
2525
2526
2527 //
2528 // Watched Field functions
2529 //
2530
2531 jvmtiError
2532 JvmtiEnv::SetFieldAccessWatch(fieldDescriptor* fdesc_ptr) {
2533 // make sure we haven't set this watch before
2534 if (fdesc_ptr->is_field_access_watched()) return JVMTI_ERROR_DUPLICATE;
2535 fdesc_ptr->set_is_field_access_watched(true);
2536
2537 JvmtiEventController::change_field_watch(JVMTI_EVENT_FIELD_ACCESS, true);
2538
2539 return JVMTI_ERROR_NONE;
2540 } /* end SetFieldAccessWatch */
2541
2542
2543 jvmtiError
2544 JvmtiEnv::ClearFieldAccessWatch(fieldDescriptor* fdesc_ptr) {
2545 // make sure we have a watch to clear
2546 if (!fdesc_ptr->is_field_access_watched()) return JVMTI_ERROR_NOT_FOUND;
2547 fdesc_ptr->set_is_field_access_watched(false);
2548
2549 JvmtiEventController::change_field_watch(JVMTI_EVENT_FIELD_ACCESS, false);
2550
2551 return JVMTI_ERROR_NONE;
2552 } /* end ClearFieldAccessWatch */
2553
2554
2555 jvmtiError
2556 JvmtiEnv::SetFieldModificationWatch(fieldDescriptor* fdesc_ptr) {
2557 // make sure we haven't set this watch before
2558 if (fdesc_ptr->is_field_modification_watched()) return JVMTI_ERROR_DUPLICATE;
2559 fdesc_ptr->set_is_field_modification_watched(true);
2560
2561 JvmtiEventController::change_field_watch(JVMTI_EVENT_FIELD_MODIFICATION, true);
2562
2563 return JVMTI_ERROR_NONE;
2564 } /* end SetFieldModificationWatch */
2565
2566
2567 jvmtiError
2568 JvmtiEnv::ClearFieldModificationWatch(fieldDescriptor* fdesc_ptr) {
2569 // make sure we have a watch to clear
2570 if (!fdesc_ptr->is_field_modification_watched()) return JVMTI_ERROR_NOT_FOUND;
2571 fdesc_ptr->set_is_field_modification_watched(false);
2572
2573 JvmtiEventController::change_field_watch(JVMTI_EVENT_FIELD_MODIFICATION, false);
2574
2575 return JVMTI_ERROR_NONE;
2576 } /* end ClearFieldModificationWatch */
2577
2578 //
2579 // Class functions
2580 //
2581
2582
2583 // k_mirror - may be primitive, this must be checked
2584 // signature_ptr - null is a valid value, must be checked
2585 // generic_ptr - null is a valid value, must be checked
2586 jvmtiError
2587 JvmtiEnv::GetClassSignature(oop k_mirror, char** signature_ptr, char** generic_ptr) {
2588 ResourceMark rm;
2589 bool isPrimitive = java_lang_Class::is_primitive(k_mirror);
2590 Klass* k = nullptr;
2591 if (!isPrimitive) {
2592 k = java_lang_Class::as_Klass(k_mirror);
2593 NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS);
2594 }
2595 if (signature_ptr != nullptr) {
2596 char* result = nullptr;
2597 if (isPrimitive) {
2598 char tchar = type2char(java_lang_Class::primitive_type(k_mirror));
2599 result = (char*) jvmtiMalloc(2);
2600 result[0] = tchar;
2601 result[1] = '\0';
2602 } else {
2603 const char* class_sig = k->signature_name();
2604 result = (char *) jvmtiMalloc(strlen(class_sig)+1);
2605 strcpy(result, class_sig);
2606 }
2607 *signature_ptr = result;
2608 }
2609 if (generic_ptr != nullptr) {
2610 *generic_ptr = nullptr;
2611 if (!isPrimitive && k->is_instance_klass()) {
2612 Symbol* soo = InstanceKlass::cast(k)->generic_signature();
2613 if (soo != nullptr) {
2614 const char *gen_sig = soo->as_C_string();
2615 if (gen_sig != nullptr) {
2616 char* gen_result;
2617 jvmtiError err = allocate(strlen(gen_sig) + 1,
2618 (unsigned char **)&gen_result);
2619 if (err != JVMTI_ERROR_NONE) {
2620 return err;
2621 }
2622 strcpy(gen_result, gen_sig);
2623 *generic_ptr = gen_result;
2624 }
2625 }
2626 }
2627 }
2628 return JVMTI_ERROR_NONE;
2629 } /* end GetClassSignature */
2630
2631
2632 // k_mirror - may be primitive, this must be checked
2633 // status_ptr - pre-checked for null
2634 jvmtiError
2635 JvmtiEnv::GetClassStatus(oop k_mirror, jint* status_ptr) {
2636 jint result = 0;
2637 if (java_lang_Class::is_primitive(k_mirror)) {
2638 result |= JVMTI_CLASS_STATUS_PRIMITIVE;
2639 } else {
2640 Klass* k = java_lang_Class::as_Klass(k_mirror);
2641 NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS);
2642 result = k->jvmti_class_status();
2643 }
2644 *status_ptr = result;
2645
2646 return JVMTI_ERROR_NONE;
2647 } /* end GetClassStatus */
2648
2649
2650 // k_mirror - may be primitive, this must be checked
2651 // source_name_ptr - pre-checked for null
2652 jvmtiError
2653 JvmtiEnv::GetSourceFileName(oop k_mirror, char** source_name_ptr) {
2654 if (java_lang_Class::is_primitive(k_mirror)) {
2655 return JVMTI_ERROR_ABSENT_INFORMATION;
2656 }
2657 Klass* k_klass = java_lang_Class::as_Klass(k_mirror);
2658 NULL_CHECK(k_klass, JVMTI_ERROR_INVALID_CLASS);
2659
2660 if (!k_klass->is_instance_klass()) {
2661 return JVMTI_ERROR_ABSENT_INFORMATION;
2662 }
2663
2664 Symbol* sfnOop = InstanceKlass::cast(k_klass)->source_file_name();
2665 NULL_CHECK(sfnOop, JVMTI_ERROR_ABSENT_INFORMATION);
2666 {
2667 JavaThread* current_thread = JavaThread::current();
2668 ResourceMark rm(current_thread);
2669 const char* sfncp = (const char*) sfnOop->as_C_string();
2670 *source_name_ptr = (char *) jvmtiMalloc(strlen(sfncp)+1);
2671 strcpy(*source_name_ptr, sfncp);
2672 }
2673
2674 return JVMTI_ERROR_NONE;
2675 } /* end GetSourceFileName */
2676
2677
2678 // k_mirror - may be primitive, this must be checked
2679 // modifiers_ptr - pre-checked for null
2680 jvmtiError
2681 JvmtiEnv::GetClassModifiers(oop k_mirror, jint* modifiers_ptr) {
2682 JavaThread* current_thread = JavaThread::current();
2683 jint result = 0;
2684 if (!java_lang_Class::is_primitive(k_mirror)) {
2685 Klass* k = java_lang_Class::as_Klass(k_mirror);
2686 NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS);
2687 result = k->compute_modifier_flags();
2688
2689 // Reset the deleted ACC_SUPER bit (deleted in compute_modifier_flags()).
2690 if (k->is_super()) {
2691 result |= JVM_ACC_SUPER;
2692 }
2693 } else {
2694 result = (JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC);
2695 }
2696 *modifiers_ptr = result;
2697
2698 return JVMTI_ERROR_NONE;
2699 } /* end GetClassModifiers */
2700
2701
2702 // k_mirror - may be primitive, this must be checked
2703 // method_count_ptr - pre-checked for null
2704 // methods_ptr - pre-checked for null
2705 jvmtiError
2706 JvmtiEnv::GetClassMethods(oop k_mirror, jint* method_count_ptr, jmethodID** methods_ptr) {
2707 JavaThread* current_thread = JavaThread::current();
2708 HandleMark hm(current_thread);
2709
2710 if (java_lang_Class::is_primitive(k_mirror)) {
2711 *method_count_ptr = 0;
2712 *methods_ptr = (jmethodID*) jvmtiMalloc(0 * sizeof(jmethodID));
2713 return JVMTI_ERROR_NONE;
2714 }
2715 Klass* k = java_lang_Class::as_Klass(k_mirror);
2716 NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS);
2717
2718 // Return CLASS_NOT_PREPARED error as per JVMTI spec.
2719 if (!(k->jvmti_class_status() & (JVMTI_CLASS_STATUS_PREPARED|JVMTI_CLASS_STATUS_ARRAY) )) {
2720 return JVMTI_ERROR_CLASS_NOT_PREPARED;
2721 }
2722
2723 if (!k->is_instance_klass()) {
2724 *method_count_ptr = 0;
2725 *methods_ptr = (jmethodID*) jvmtiMalloc(0 * sizeof(jmethodID));
2726 return JVMTI_ERROR_NONE;
2727 }
2728 InstanceKlass* ik = InstanceKlass::cast(k);
2729 // Allocate the result and fill it in
2730 int result_length = ik->methods()->length();
2731 jmethodID* result_list = (jmethodID*)jvmtiMalloc(result_length * sizeof(jmethodID));
2732 int index;
2733 bool jmethodids_found = true;
2734 int skipped = 0; // skip overpass methods
2735
2736 for (index = 0; index < result_length; index++) {
2737 Method* m = ik->methods()->at(index);
2738 // Depending on can_maintain_original_method_order capability use the original
2739 // method ordering indices stored in the class, so we can emit jmethodIDs in
2740 // the order they appeared in the class file or just copy in current order.
2741 int result_index = JvmtiExport::can_maintain_original_method_order() ? ik->method_ordering()->at(index) : index;
2742 assert(result_index >= 0 && result_index < result_length, "invalid original method index");
2743 if (m->is_overpass()) {
2744 result_list[result_index] = nullptr;
2745 skipped++;
2746 continue;
2747 }
2748 jmethodID id;
2749 if (jmethodids_found) {
2750 id = m->find_jmethod_id_or_null();
2751 if (id == nullptr) {
2752 // If we find an uninitialized value, make sure there is
2753 // enough space for all the uninitialized values we might
2754 // find.
2755 ik->ensure_space_for_methodids(index);
2756 jmethodids_found = false;
2757 id = m->jmethod_id();
2758 }
2759 } else {
2760 id = m->jmethod_id();
2761 }
2762 result_list[result_index] = id;
2763 }
2764
2765 // Fill in return value.
2766 if (skipped > 0) {
2767 // copy results skipping null methodIDs
2768 *methods_ptr = (jmethodID*)jvmtiMalloc((result_length - skipped) * sizeof(jmethodID));
2769 *method_count_ptr = result_length - skipped;
2770 for (index = 0, skipped = 0; index < result_length; index++) {
2771 if (result_list[index] == nullptr) {
2772 skipped++;
2773 } else {
2774 (*methods_ptr)[index - skipped] = result_list[index];
2775 }
2776 }
2777 deallocate((unsigned char *)result_list);
2778 } else {
2779 *method_count_ptr = result_length;
2780 *methods_ptr = result_list;
2781 }
2782
2783 return JVMTI_ERROR_NONE;
2784 } /* end GetClassMethods */
2785
2786
2787 // k_mirror - may be primitive, this must be checked
2788 // field_count_ptr - pre-checked for null
2789 // fields_ptr - pre-checked for null
2790 jvmtiError
2791 JvmtiEnv::GetClassFields(oop k_mirror, jint* field_count_ptr, jfieldID** fields_ptr) {
2792 if (java_lang_Class::is_primitive(k_mirror)) {
2793 *field_count_ptr = 0;
2794 *fields_ptr = (jfieldID*) jvmtiMalloc(0 * sizeof(jfieldID));
2795 return JVMTI_ERROR_NONE;
2796 }
2797 JavaThread* current_thread = JavaThread::current();
2798 HandleMark hm(current_thread);
2799 Klass* k = java_lang_Class::as_Klass(k_mirror);
2800 NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS);
2801
2802 // Return CLASS_NOT_PREPARED error as per JVMTI spec.
2803 if (!(k->jvmti_class_status() & (JVMTI_CLASS_STATUS_PREPARED|JVMTI_CLASS_STATUS_ARRAY) )) {
2804 return JVMTI_ERROR_CLASS_NOT_PREPARED;
2805 }
2806
2807 if (!k->is_instance_klass()) {
2808 *field_count_ptr = 0;
2809 *fields_ptr = (jfieldID*) jvmtiMalloc(0 * sizeof(jfieldID));
2810 return JVMTI_ERROR_NONE;
2811 }
2812
2813 InstanceKlass* ik = InstanceKlass::cast(k);
2814
2815 FilteredJavaFieldStream flds(ik);
2816
2817 int result_count = flds.field_count();
2818
2819 // Allocate the result and fill it in.
2820 jfieldID* result_list = (jfieldID*)jvmtiMalloc(result_count * sizeof(jfieldID));
2821 for (int i = 0; i < result_count; i++, flds.next()) {
2822 result_list[i] = jfieldIDWorkaround::to_jfieldID(ik, flds.offset(),
2823 flds.access_flags().is_static());
2824 }
2825 assert(flds.done(), "just checking");
2826
2827 // Fill in the results
2828 *field_count_ptr = result_count;
2829 *fields_ptr = result_list;
2830
2831 return JVMTI_ERROR_NONE;
2832 } /* end GetClassFields */
2833
2834
2835 // k_mirror - may be primitive, this must be checked
2836 // interface_count_ptr - pre-checked for null
2837 // interfaces_ptr - pre-checked for null
2838 jvmtiError
2839 JvmtiEnv::GetImplementedInterfaces(oop k_mirror, jint* interface_count_ptr, jclass** interfaces_ptr) {
2840 {
2841 if (java_lang_Class::is_primitive(k_mirror)) {
2842 *interface_count_ptr = 0;
2843 *interfaces_ptr = (jclass*) jvmtiMalloc(0 * sizeof(jclass));
2844 return JVMTI_ERROR_NONE;
2845 }
2846 JavaThread* current_thread = JavaThread::current();
2847 HandleMark hm(current_thread);
2848 Klass* k = java_lang_Class::as_Klass(k_mirror);
2849 NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS);
2850
2851 // Return CLASS_NOT_PREPARED error as per JVMTI spec.
2852 if (!(k->jvmti_class_status() & (JVMTI_CLASS_STATUS_PREPARED|JVMTI_CLASS_STATUS_ARRAY) ))
2853 return JVMTI_ERROR_CLASS_NOT_PREPARED;
2854
2855 if (!k->is_instance_klass()) {
2856 *interface_count_ptr = 0;
2857 *interfaces_ptr = (jclass*) jvmtiMalloc(0 * sizeof(jclass));
2858 return JVMTI_ERROR_NONE;
2859 }
2860
2861 Array<InstanceKlass*>* interface_list = InstanceKlass::cast(k)->local_interfaces();
2862 const int result_length = (interface_list == nullptr ? 0 : interface_list->length());
2863 jclass* result_list = (jclass*) jvmtiMalloc(result_length * sizeof(jclass));
2864 for (int i_index = 0; i_index < result_length; i_index += 1) {
2865 InstanceKlass* klass_at = interface_list->at(i_index);
2866 assert(klass_at->is_klass(), "interfaces must be Klass*s");
2867 assert(klass_at->is_interface(), "interfaces must be interfaces");
2868 oop mirror_at = klass_at->java_mirror();
2869 Handle handle_at = Handle(current_thread, mirror_at);
2870 result_list[i_index] = (jclass) jni_reference(handle_at);
2871 }
2872 *interface_count_ptr = result_length;
2873 *interfaces_ptr = result_list;
2874 }
2875
2876 return JVMTI_ERROR_NONE;
2877 } /* end GetImplementedInterfaces */
2878
2879
2880 // k_mirror - may be primitive, this must be checked
2881 // minor_version_ptr - pre-checked for null
2882 // major_version_ptr - pre-checked for null
2883 jvmtiError
2884 JvmtiEnv::GetClassVersionNumbers(oop k_mirror, jint* minor_version_ptr, jint* major_version_ptr) {
2885 if (java_lang_Class::is_primitive(k_mirror)) {
2886 return JVMTI_ERROR_ABSENT_INFORMATION;
2887 }
2888 Klass* klass = java_lang_Class::as_Klass(k_mirror);
2889
2890 jint status = klass->jvmti_class_status();
2891 if (status & (JVMTI_CLASS_STATUS_ERROR)) {
2892 return JVMTI_ERROR_INVALID_CLASS;
2893 }
2894 if (status & (JVMTI_CLASS_STATUS_ARRAY)) {
2895 return JVMTI_ERROR_ABSENT_INFORMATION;
2896 }
2897
2898 InstanceKlass* ik = InstanceKlass::cast(klass);
2899 *minor_version_ptr = ik->minor_version();
2900 *major_version_ptr = ik->major_version();
2901
2902 return JVMTI_ERROR_NONE;
2903 } /* end GetClassVersionNumbers */
2904
2905
2906 // k_mirror - may be primitive, this must be checked
2907 // constant_pool_count_ptr - pre-checked for null
2908 // constant_pool_byte_count_ptr - pre-checked for null
2909 // constant_pool_bytes_ptr - pre-checked for null
2910 jvmtiError
2911 JvmtiEnv::GetConstantPool(oop k_mirror, jint* constant_pool_count_ptr, jint* constant_pool_byte_count_ptr, unsigned char** constant_pool_bytes_ptr) {
2912 if (java_lang_Class::is_primitive(k_mirror)) {
2913 return JVMTI_ERROR_ABSENT_INFORMATION;
2914 }
2915
2916 Klass* klass = java_lang_Class::as_Klass(k_mirror);
2917 Thread *thread = Thread::current();
2918 ResourceMark rm(thread);
2919
2920 jint status = klass->jvmti_class_status();
2921 if (status & (JVMTI_CLASS_STATUS_ERROR)) {
2922 return JVMTI_ERROR_INVALID_CLASS;
2923 }
2924 if (status & (JVMTI_CLASS_STATUS_ARRAY)) {
2925 return JVMTI_ERROR_ABSENT_INFORMATION;
2926 }
2927
2928 InstanceKlass* ik = InstanceKlass::cast(klass);
2929 JvmtiConstantPoolReconstituter reconstituter(ik);
2930 if (reconstituter.get_error() != JVMTI_ERROR_NONE) {
2931 return reconstituter.get_error();
2932 }
2933
2934 unsigned char *cpool_bytes;
2935 int cpool_size = reconstituter.cpool_size();
2936 if (reconstituter.get_error() != JVMTI_ERROR_NONE) {
2937 return reconstituter.get_error();
2938 }
2939 jvmtiError res = allocate(cpool_size, &cpool_bytes);
2940 if (res != JVMTI_ERROR_NONE) {
2941 return res;
2942 }
2943 reconstituter.copy_cpool_bytes(cpool_bytes);
2944 if (reconstituter.get_error() != JVMTI_ERROR_NONE) {
2945 return reconstituter.get_error();
2946 }
2947
2948 constantPoolHandle constants(thread, ik->constants());
2949 *constant_pool_count_ptr = constants->length();
2950 *constant_pool_byte_count_ptr = cpool_size;
2951 *constant_pool_bytes_ptr = cpool_bytes;
2952
2953 return JVMTI_ERROR_NONE;
2954 } /* end GetConstantPool */
2955
2956
2957 // k_mirror - may be primitive, this must be checked
2958 // is_interface_ptr - pre-checked for null
2959 jvmtiError
2960 JvmtiEnv::IsInterface(oop k_mirror, jboolean* is_interface_ptr) {
2961 {
2962 bool result = false;
2963 if (!java_lang_Class::is_primitive(k_mirror)) {
2964 Klass* k = java_lang_Class::as_Klass(k_mirror);
2965 if (k != nullptr && k->is_interface()) {
2966 result = true;
2967 }
2968 }
2969 *is_interface_ptr = result;
2970 }
2971
2972 return JVMTI_ERROR_NONE;
2973 } /* end IsInterface */
2974
2975
2976 // k_mirror - may be primitive, this must be checked
2977 // is_array_class_ptr - pre-checked for null
2978 jvmtiError
2979 JvmtiEnv::IsArrayClass(oop k_mirror, jboolean* is_array_class_ptr) {
2980 {
2981 bool result = false;
2982 if (!java_lang_Class::is_primitive(k_mirror)) {
2983 Klass* k = java_lang_Class::as_Klass(k_mirror);
2984 if (k != nullptr && k->is_array_klass()) {
2985 result = true;
2986 }
2987 }
2988 *is_array_class_ptr = result;
2989 }
2990
2991 return JVMTI_ERROR_NONE;
2992 } /* end IsArrayClass */
2993
2994
2995 // k_mirror - may be primitive, this must be checked
2996 // classloader_ptr - pre-checked for null
2997 jvmtiError
2998 JvmtiEnv::GetClassLoader(oop k_mirror, jobject* classloader_ptr) {
2999 {
3000 if (java_lang_Class::is_primitive(k_mirror)) {
3001 *classloader_ptr = (jclass) jni_reference(Handle());
3002 return JVMTI_ERROR_NONE;
3003 }
3004 JavaThread* current_thread = JavaThread::current();
3005 HandleMark hm(current_thread);
3006 Klass* k = java_lang_Class::as_Klass(k_mirror);
3007 NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS);
3008
3009 oop result_oop = k->class_loader();
3010 if (result_oop == nullptr) {
3011 *classloader_ptr = (jclass) jni_reference(Handle());
3012 return JVMTI_ERROR_NONE;
3013 }
3014 Handle result_handle = Handle(current_thread, result_oop);
3015 jclass result_jnihandle = (jclass) jni_reference(result_handle);
3016 *classloader_ptr = result_jnihandle;
3017 }
3018 return JVMTI_ERROR_NONE;
3019 } /* end GetClassLoader */
3020
3021
3022 // k_mirror - may be primitive, this must be checked
3023 // source_debug_extension_ptr - pre-checked for null
3024 jvmtiError
3025 JvmtiEnv::GetSourceDebugExtension(oop k_mirror, char** source_debug_extension_ptr) {
3026 {
3027 if (java_lang_Class::is_primitive(k_mirror)) {
3028 return JVMTI_ERROR_ABSENT_INFORMATION;
3029 }
3030 Klass* k = java_lang_Class::as_Klass(k_mirror);
3031 NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS);
3032 if (!k->is_instance_klass()) {
3033 return JVMTI_ERROR_ABSENT_INFORMATION;
3034 }
3035 const char* sde = InstanceKlass::cast(k)->source_debug_extension();
3036 NULL_CHECK(sde, JVMTI_ERROR_ABSENT_INFORMATION);
3037
3038 {
3039 *source_debug_extension_ptr = (char *) jvmtiMalloc(strlen(sde)+1);
3040 strcpy(*source_debug_extension_ptr, sde);
3041 }
3042 }
3043
3044 return JVMTI_ERROR_NONE;
3045 } /* end GetSourceDebugExtension */
3046
3047 //
3048 // Object functions
3049 //
3050
3051 // hash_code_ptr - pre-checked for null
3052 jvmtiError
3053 JvmtiEnv::GetObjectHashCode(jobject object, jint* hash_code_ptr) {
3054 oop mirror = JNIHandles::resolve_external_guard(object);
3055 NULL_CHECK(mirror, JVMTI_ERROR_INVALID_OBJECT);
3056 NULL_CHECK(hash_code_ptr, JVMTI_ERROR_NULL_POINTER);
3057
3058 {
3059 jint result = (jint) mirror->identity_hash();
3060 *hash_code_ptr = result;
3061 }
3062 return JVMTI_ERROR_NONE;
3063 } /* end GetObjectHashCode */
3064
3065
3066 // info_ptr - pre-checked for null
3067 jvmtiError
3068 JvmtiEnv::GetObjectMonitorUsage(jobject object, jvmtiMonitorUsage* info_ptr) {
3069 // This needs to be performed at a safepoint to gather stable data
3070 // because monitor owner / waiters might not be suspended.
3071 VM_GetObjectMonitorUsage op(this, JavaThread::current(), object, info_ptr);
3072 VMThread::execute(&op);
3073 return op.result();
3074 } /* end GetObjectMonitorUsage */
3075
3076
3077 //
3078 // Field functions
3079 //
3080
3081 // name_ptr - null is a valid value, must be checked
3082 // signature_ptr - null is a valid value, must be checked
3083 // generic_ptr - null is a valid value, must be checked
3084 jvmtiError
3085 JvmtiEnv::GetFieldName(fieldDescriptor* fdesc_ptr, char** name_ptr, char** signature_ptr, char** generic_ptr) {
3086 JavaThread* current_thread = JavaThread::current();
3087 ResourceMark rm(current_thread);
3088 if (name_ptr == nullptr) {
3089 // just don't return the name
3090 } else {
3091 const char* fieldName = fdesc_ptr->name()->as_C_string();
3092 *name_ptr = (char*) jvmtiMalloc(strlen(fieldName) + 1);
3093 if (*name_ptr == nullptr)
3094 return JVMTI_ERROR_OUT_OF_MEMORY;
3095 strcpy(*name_ptr, fieldName);
3096 }
3097 if (signature_ptr== nullptr) {
3098 // just don't return the signature
3099 } else {
3100 const char* fieldSignature = fdesc_ptr->signature()->as_C_string();
3101 *signature_ptr = (char*) jvmtiMalloc(strlen(fieldSignature) + 1);
3102 if (*signature_ptr == nullptr)
3103 return JVMTI_ERROR_OUT_OF_MEMORY;
3104 strcpy(*signature_ptr, fieldSignature);
3105 }
3106 if (generic_ptr != nullptr) {
3107 *generic_ptr = nullptr;
3108 Symbol* soop = fdesc_ptr->generic_signature();
3109 if (soop != nullptr) {
3110 const char* gen_sig = soop->as_C_string();
3111 if (gen_sig != nullptr) {
3112 jvmtiError err = allocate(strlen(gen_sig) + 1, (unsigned char **)generic_ptr);
3113 if (err != JVMTI_ERROR_NONE) {
3114 return err;
3115 }
3116 strcpy(*generic_ptr, gen_sig);
3117 }
3118 }
3119 }
3120 return JVMTI_ERROR_NONE;
3121 } /* end GetFieldName */
3122
3123
3124 // declaring_class_ptr - pre-checked for null
3125 jvmtiError
3126 JvmtiEnv::GetFieldDeclaringClass(fieldDescriptor* fdesc_ptr, jclass* declaring_class_ptr) {
3127
3128 *declaring_class_ptr = get_jni_class_non_null(fdesc_ptr->field_holder());
3129 return JVMTI_ERROR_NONE;
3130 } /* end GetFieldDeclaringClass */
3131
3132
3133 // modifiers_ptr - pre-checked for null
3134 jvmtiError
3135 JvmtiEnv::GetFieldModifiers(fieldDescriptor* fdesc_ptr, jint* modifiers_ptr) {
3136
3137 AccessFlags resultFlags = fdesc_ptr->access_flags();
3138 jint result = resultFlags.as_int();
3139 *modifiers_ptr = result;
3140
3141 return JVMTI_ERROR_NONE;
3142 } /* end GetFieldModifiers */
3143
3144
3145 // is_synthetic_ptr - pre-checked for null
3146 jvmtiError
3147 JvmtiEnv::IsFieldSynthetic(fieldDescriptor* fdesc_ptr, jboolean* is_synthetic_ptr) {
3148 *is_synthetic_ptr = fdesc_ptr->is_synthetic();
3149 return JVMTI_ERROR_NONE;
3150 } /* end IsFieldSynthetic */
3151
3152
3153 //
3154 // Method functions
3155 //
3156
3157 // method - pre-checked for validity, but may be null meaning obsolete method
3158 // name_ptr - null is a valid value, must be checked
3159 // signature_ptr - null is a valid value, must be checked
3160 // generic_ptr - null is a valid value, must be checked
3161 jvmtiError
3162 JvmtiEnv::GetMethodName(Method* method, char** name_ptr, char** signature_ptr, char** generic_ptr) {
3163 NULL_CHECK(method, JVMTI_ERROR_INVALID_METHODID);
3164 JavaThread* current_thread = JavaThread::current();
3165
3166 ResourceMark rm(current_thread); // get the utf8 name and signature
3167 if (name_ptr == nullptr) {
3168 // just don't return the name
3169 } else {
3170 const char* utf8_name = (const char *) method->name()->as_utf8();
3171 *name_ptr = (char *) jvmtiMalloc(strlen(utf8_name)+1);
3172 strcpy(*name_ptr, utf8_name);
3173 }
3174 if (signature_ptr == nullptr) {
3175 // just don't return the signature
3176 } else {
3177 const char* utf8_signature = (const char *) method->signature()->as_utf8();
3178 *signature_ptr = (char *) jvmtiMalloc(strlen(utf8_signature) + 1);
3179 strcpy(*signature_ptr, utf8_signature);
3180 }
3181
3182 if (generic_ptr != nullptr) {
3183 *generic_ptr = nullptr;
3184 Symbol* soop = method->generic_signature();
3185 if (soop != nullptr) {
3186 const char* gen_sig = soop->as_C_string();
3187 if (gen_sig != nullptr) {
3188 jvmtiError err = allocate(strlen(gen_sig) + 1, (unsigned char **)generic_ptr);
3189 if (err != JVMTI_ERROR_NONE) {
3190 return err;
3191 }
3192 strcpy(*generic_ptr, gen_sig);
3193 }
3194 }
3195 }
3196 return JVMTI_ERROR_NONE;
3197 } /* end GetMethodName */
3198
3199
3200 // method - pre-checked for validity, but may be null meaning obsolete method
3201 // declaring_class_ptr - pre-checked for null
3202 jvmtiError
3203 JvmtiEnv::GetMethodDeclaringClass(Method* method, jclass* declaring_class_ptr) {
3204 NULL_CHECK(method, JVMTI_ERROR_INVALID_METHODID);
3205 (*declaring_class_ptr) = get_jni_class_non_null(method->method_holder());
3206 return JVMTI_ERROR_NONE;
3207 } /* end GetMethodDeclaringClass */
3208
3209
3210 // method - pre-checked for validity, but may be null meaning obsolete method
3211 // modifiers_ptr - pre-checked for null
3212 jvmtiError
3213 JvmtiEnv::GetMethodModifiers(Method* method, jint* modifiers_ptr) {
3214 NULL_CHECK(method, JVMTI_ERROR_INVALID_METHODID);
3215 (*modifiers_ptr) = method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
3216 return JVMTI_ERROR_NONE;
3217 } /* end GetMethodModifiers */
3218
3219
3220 // method - pre-checked for validity, but may be null meaning obsolete method
3221 // max_ptr - pre-checked for null
3222 jvmtiError
3223 JvmtiEnv::GetMaxLocals(Method* method, jint* max_ptr) {
3224 NULL_CHECK(method, JVMTI_ERROR_INVALID_METHODID);
3225 // get max stack
3226 (*max_ptr) = method->max_locals();
3227 return JVMTI_ERROR_NONE;
3228 } /* end GetMaxLocals */
3229
3230
3231 // method - pre-checked for validity, but may be null meaning obsolete method
3232 // size_ptr - pre-checked for null
3233 jvmtiError
3234 JvmtiEnv::GetArgumentsSize(Method* method, jint* size_ptr) {
3235 NULL_CHECK(method, JVMTI_ERROR_INVALID_METHODID);
3236 // get size of arguments
3237
3238 (*size_ptr) = method->size_of_parameters();
3239 return JVMTI_ERROR_NONE;
3240 } /* end GetArgumentsSize */
3241
3242
3243 // method - pre-checked for validity, but may be null meaning obsolete method
3244 // entry_count_ptr - pre-checked for null
3245 // table_ptr - pre-checked for null
3246 jvmtiError
3247 JvmtiEnv::GetLineNumberTable(Method* method, jint* entry_count_ptr, jvmtiLineNumberEntry** table_ptr) {
3248 NULL_CHECK(method, JVMTI_ERROR_INVALID_METHODID);
3249 if (!method->has_linenumber_table()) {
3250 return (JVMTI_ERROR_ABSENT_INFORMATION);
3251 }
3252
3253 // The line number table is compressed so we don't know how big it is until decompressed.
3254 // Decompression is really fast so we just do it twice.
3255
3256 // Compute size of table
3257 jint num_entries = 0;
3258 CompressedLineNumberReadStream stream(method->compressed_linenumber_table());
3259 while (stream.read_pair()) {
3260 num_entries++;
3261 }
3262 jvmtiLineNumberEntry *jvmti_table =
3263 (jvmtiLineNumberEntry *)jvmtiMalloc(num_entries * (sizeof(jvmtiLineNumberEntry)));
3264
3265 // Fill jvmti table
3266 if (num_entries > 0) {
3267 int index = 0;
3268 CompressedLineNumberReadStream stream(method->compressed_linenumber_table());
3269 while (stream.read_pair()) {
3270 jvmti_table[index].start_location = (jlocation) stream.bci();
3271 jvmti_table[index].line_number = (jint) stream.line();
3272 index++;
3273 }
3274 assert(index == num_entries, "sanity check");
3275 }
3276
3277 // Set up results
3278 (*entry_count_ptr) = num_entries;
3279 (*table_ptr) = jvmti_table;
3280
3281 return JVMTI_ERROR_NONE;
3282 } /* end GetLineNumberTable */
3283
3284
3285 // method - pre-checked for validity, but may be null meaning obsolete method
3286 // start_location_ptr - pre-checked for null
3287 // end_location_ptr - pre-checked for null
3288 jvmtiError
3289 JvmtiEnv::GetMethodLocation(Method* method, jlocation* start_location_ptr, jlocation* end_location_ptr) {
3290
3291 NULL_CHECK(method, JVMTI_ERROR_INVALID_METHODID);
3292 // get start and end location
3293 (*end_location_ptr) = (jlocation) (method->code_size() - 1);
3294 if (method->code_size() == 0) {
3295 // there is no code so there is no start location
3296 (*start_location_ptr) = (jlocation)(-1);
3297 } else {
3298 (*start_location_ptr) = (jlocation)(0);
3299 }
3300
3301 return JVMTI_ERROR_NONE;
3302 } /* end GetMethodLocation */
3303
3304
3305 // method - pre-checked for validity, but may be null meaning obsolete method
3306 // entry_count_ptr - pre-checked for null
3307 // table_ptr - pre-checked for null
3308 jvmtiError
3309 JvmtiEnv::GetLocalVariableTable(Method* method, jint* entry_count_ptr, jvmtiLocalVariableEntry** table_ptr) {
3310
3311 NULL_CHECK(method, JVMTI_ERROR_INVALID_METHODID);
3312 JavaThread* current_thread = JavaThread::current();
3313
3314 // does the klass have any local variable information?
3315 InstanceKlass* ik = method->method_holder();
3316 if (!ik->has_localvariable_table()) {
3317 return (JVMTI_ERROR_ABSENT_INFORMATION);
3318 }
3319
3320 ConstantPool* constants = method->constants();
3321 NULL_CHECK(constants, JVMTI_ERROR_ABSENT_INFORMATION);
3322
3323 // in the vm localvariable table representation, 6 consecutive elements in the table
3324 // represent a 6-tuple of shorts
3325 // [start_pc, length, name_index, descriptor_index, signature_index, index]
3326 jint num_entries = method->localvariable_table_length();
3327 jvmtiLocalVariableEntry *jvmti_table = (jvmtiLocalVariableEntry *)
3328 jvmtiMalloc(num_entries * (sizeof(jvmtiLocalVariableEntry)));
3329
3330 if (num_entries > 0) {
3331 LocalVariableTableElement* table = method->localvariable_table_start();
3332 for (int i = 0; i < num_entries; i++) {
3333 // get the 5 tuple information from the vm table
3334 jlocation start_location = (jlocation) table[i].start_bci;
3335 jint length = (jint) table[i].length;
3336 int name_index = (int) table[i].name_cp_index;
3337 int signature_index = (int) table[i].descriptor_cp_index;
3338 int generic_signature_index = (int) table[i].signature_cp_index;
3339 jint slot = (jint) table[i].slot;
3340
3341 // get utf8 name and signature
3342 char *name_buf = nullptr;
3343 char *sig_buf = nullptr;
3344 char *gen_sig_buf = nullptr;
3345 {
3346 ResourceMark rm(current_thread);
3347
3348 const char *utf8_name = (const char *) constants->symbol_at(name_index)->as_utf8();
3349 name_buf = (char *) jvmtiMalloc(strlen(utf8_name)+1);
3350 strcpy(name_buf, utf8_name);
3351
3352 const char *utf8_signature = (const char *) constants->symbol_at(signature_index)->as_utf8();
3353 sig_buf = (char *) jvmtiMalloc(strlen(utf8_signature)+1);
3354 strcpy(sig_buf, utf8_signature);
3355
3356 if (generic_signature_index > 0) {
3357 const char *utf8_gen_sign = (const char *)
3358 constants->symbol_at(generic_signature_index)->as_utf8();
3359 gen_sig_buf = (char *) jvmtiMalloc(strlen(utf8_gen_sign)+1);
3360 strcpy(gen_sig_buf, utf8_gen_sign);
3361 }
3362 }
3363
3364 // fill in the jvmti local variable table
3365 jvmti_table[i].start_location = start_location;
3366 jvmti_table[i].length = length;
3367 jvmti_table[i].name = name_buf;
3368 jvmti_table[i].signature = sig_buf;
3369 jvmti_table[i].generic_signature = gen_sig_buf;
3370 jvmti_table[i].slot = slot;
3371 }
3372 }
3373
3374 // set results
3375 (*entry_count_ptr) = num_entries;
3376 (*table_ptr) = jvmti_table;
3377
3378 return JVMTI_ERROR_NONE;
3379 } /* end GetLocalVariableTable */
3380
3381
3382 // method - pre-checked for validity, but may be null meaning obsolete method
3383 // bytecode_count_ptr - pre-checked for null
3384 // bytecodes_ptr - pre-checked for null
3385 jvmtiError
3386 JvmtiEnv::GetBytecodes(Method* method, jint* bytecode_count_ptr, unsigned char** bytecodes_ptr) {
3387 NULL_CHECK(method, JVMTI_ERROR_INVALID_METHODID);
3388
3389 methodHandle mh(Thread::current(), method);
3390 jint size = (jint)mh->code_size();
3391 jvmtiError err = allocate(size, bytecodes_ptr);
3392 if (err != JVMTI_ERROR_NONE) {
3393 return err;
3394 }
3395
3396 (*bytecode_count_ptr) = size;
3397 // get byte codes
3398 JvmtiClassFileReconstituter::copy_bytecodes(mh, *bytecodes_ptr);
3399
3400 return JVMTI_ERROR_NONE;
3401 } /* end GetBytecodes */
3402
3403
3404 // method - pre-checked for validity, but may be null meaning obsolete method
3405 // is_native_ptr - pre-checked for null
3406 jvmtiError
3407 JvmtiEnv::IsMethodNative(Method* method, jboolean* is_native_ptr) {
3408 NULL_CHECK(method, JVMTI_ERROR_INVALID_METHODID);
3409 (*is_native_ptr) = method->is_native();
3410 return JVMTI_ERROR_NONE;
3411 } /* end IsMethodNative */
3412
3413
3414 // method - pre-checked for validity, but may be null meaning obsolete method
3415 // is_synthetic_ptr - pre-checked for null
3416 jvmtiError
3417 JvmtiEnv::IsMethodSynthetic(Method* method, jboolean* is_synthetic_ptr) {
3418 NULL_CHECK(method, JVMTI_ERROR_INVALID_METHODID);
3419 (*is_synthetic_ptr) = method->is_synthetic();
3420 return JVMTI_ERROR_NONE;
3421 } /* end IsMethodSynthetic */
3422
3423
3424 // method - pre-checked for validity, but may be null meaning obsolete method
3425 // is_obsolete_ptr - pre-checked for null
3426 jvmtiError
3427 JvmtiEnv::IsMethodObsolete(Method* method, jboolean* is_obsolete_ptr) {
3428 if (use_version_1_0_semantics() &&
3429 get_capabilities()->can_redefine_classes == 0) {
3430 // This JvmtiEnv requested version 1.0 semantics and this function
3431 // requires the can_redefine_classes capability in version 1.0 so
3432 // we need to return an error here.
3433 return JVMTI_ERROR_MUST_POSSESS_CAPABILITY;
3434 }
3435
3436 if (method == nullptr || method->is_obsolete()) {
3437 *is_obsolete_ptr = true;
3438 } else {
3439 *is_obsolete_ptr = false;
3440 }
3441 return JVMTI_ERROR_NONE;
3442 } /* end IsMethodObsolete */
3443
3444 //
3445 // Raw Monitor functions
3446 //
3447
3448 // name - pre-checked for null
3449 // monitor_ptr - pre-checked for null
3450 jvmtiError
3451 JvmtiEnv::CreateRawMonitor(const char* name, jrawMonitorID* monitor_ptr) {
3452 JvmtiRawMonitor* rmonitor = new (std::nothrow) JvmtiRawMonitor(name);
3453 NULL_CHECK(rmonitor, JVMTI_ERROR_OUT_OF_MEMORY);
3454
3455 *monitor_ptr = (jrawMonitorID)rmonitor;
3456
3457 return JVMTI_ERROR_NONE;
3458 } /* end CreateRawMonitor */
3459
3460
3461 // rmonitor - pre-checked for validity
3462 jvmtiError
3463 JvmtiEnv::DestroyRawMonitor(JvmtiRawMonitor * rmonitor) {
3464 if (Threads::number_of_threads() == 0) {
3465 // Remove this monitor from pending raw monitors list
3466 // if it has entered in onload or start phase.
3467 JvmtiPendingMonitors::destroy(rmonitor);
3468 } else {
3469 Thread* thread = Thread::current();
3470 if (rmonitor->owner() == thread) {
3471 // The caller owns this monitor which we are about to destroy.
3472 // We exit the underlying synchronization object so that the
3473 // "delete monitor" call below can work without an assertion
3474 // failure on systems that don't like destroying synchronization
3475 // objects that are locked.
3476 int r;
3477 int recursion = rmonitor->recursions();
3478 for (int i = 0; i <= recursion; i++) {
3479 r = rmonitor->raw_exit(thread);
3480 assert(r == JvmtiRawMonitor::M_OK, "raw_exit should have worked");
3481 if (r != JvmtiRawMonitor::M_OK) { // robustness
3482 return JVMTI_ERROR_INTERNAL;
3483 }
3484 }
3485 }
3486 if (rmonitor->owner() != nullptr) {
3487 // The caller is trying to destroy a monitor that is locked by
3488 // someone else. While this is not forbidden by the JVMTI
3489 // spec, it will cause an assertion failure on systems that don't
3490 // like destroying synchronization objects that are locked.
3491 // We indicate a problem with the error return (and leak the
3492 // monitor's memory).
3493 return JVMTI_ERROR_NOT_MONITOR_OWNER;
3494 }
3495 }
3496
3497 delete rmonitor;
3498
3499 return JVMTI_ERROR_NONE;
3500 } /* end DestroyRawMonitor */
3501
3502
3503 // rmonitor - pre-checked for validity
3504 jvmtiError
3505 JvmtiEnv::RawMonitorEnter(JvmtiRawMonitor * rmonitor) {
3506 if (Threads::number_of_threads() == 0) {
3507 // No JavaThreads exist so JvmtiRawMonitor enter cannot be
3508 // used, add this raw monitor to the pending list.
3509 // The pending monitors will be actually entered when
3510 // the VM is setup.
3511 // See transition_pending_raw_monitors in create_vm()
3512 // in thread.cpp.
3513 JvmtiPendingMonitors::enter(rmonitor);
3514 } else {
3515 Thread* thread = Thread::current();
3516 // 8266889: raw_enter changes Java thread state, needs WXWrite
3517 MACOS_AARCH64_ONLY(ThreadWXEnable __wx(WXWrite, thread));
3518 rmonitor->raw_enter(thread);
3519 }
3520 return JVMTI_ERROR_NONE;
3521 } /* end RawMonitorEnter */
3522
3523
3524 // rmonitor - pre-checked for validity
3525 jvmtiError
3526 JvmtiEnv::RawMonitorExit(JvmtiRawMonitor * rmonitor) {
3527 jvmtiError err = JVMTI_ERROR_NONE;
3528
3529 if (Threads::number_of_threads() == 0) {
3530 // No JavaThreads exist so just remove this monitor from the pending list.
3531 // Bool value from exit is false if rmonitor is not in the list.
3532 if (!JvmtiPendingMonitors::exit(rmonitor)) {
3533 err = JVMTI_ERROR_NOT_MONITOR_OWNER;
3534 }
3535 } else {
3536 Thread* thread = Thread::current();
3537 int r = rmonitor->raw_exit(thread);
3538 if (r == JvmtiRawMonitor::M_ILLEGAL_MONITOR_STATE) {
3539 err = JVMTI_ERROR_NOT_MONITOR_OWNER;
3540 }
3541 }
3542 return err;
3543 } /* end RawMonitorExit */
3544
3545
3546 // rmonitor - pre-checked for validity
3547 jvmtiError
3548 JvmtiEnv::RawMonitorWait(JvmtiRawMonitor * rmonitor, jlong millis) {
3549 Thread* thread = Thread::current();
3550 // 8266889: raw_wait changes Java thread state, needs WXWrite
3551 MACOS_AARCH64_ONLY(ThreadWXEnable __wx(WXWrite, thread));
3552 int r = rmonitor->raw_wait(millis, thread);
3553
3554 switch (r) {
3555 case JvmtiRawMonitor::M_INTERRUPTED:
3556 return JVMTI_ERROR_INTERRUPT;
3557 case JvmtiRawMonitor::M_ILLEGAL_MONITOR_STATE:
3558 return JVMTI_ERROR_NOT_MONITOR_OWNER;
3559 default:
3560 return JVMTI_ERROR_NONE;
3561 }
3562 } /* end RawMonitorWait */
3563
3564
3565 // rmonitor - pre-checked for validity
3566 jvmtiError
3567 JvmtiEnv::RawMonitorNotify(JvmtiRawMonitor * rmonitor) {
3568 Thread* thread = Thread::current();
3569 int r = rmonitor->raw_notify(thread);
3570
3571 if (r == JvmtiRawMonitor::M_ILLEGAL_MONITOR_STATE) {
3572 return JVMTI_ERROR_NOT_MONITOR_OWNER;
3573 }
3574 return JVMTI_ERROR_NONE;
3575 } /* end RawMonitorNotify */
3576
3577
3578 // rmonitor - pre-checked for validity
3579 jvmtiError
3580 JvmtiEnv::RawMonitorNotifyAll(JvmtiRawMonitor * rmonitor) {
3581 Thread* thread = Thread::current();
3582 int r = rmonitor->raw_notifyAll(thread);
3583
3584 if (r == JvmtiRawMonitor::M_ILLEGAL_MONITOR_STATE) {
3585 return JVMTI_ERROR_NOT_MONITOR_OWNER;
3586 }
3587 return JVMTI_ERROR_NONE;
3588 } /* end RawMonitorNotifyAll */
3589
3590
3591 //
3592 // JNI Function Interception functions
3593 //
3594
3595
3596 // function_table - pre-checked for null
3597 jvmtiError
3598 JvmtiEnv::SetJNIFunctionTable(const jniNativeInterface* function_table) {
3599 // Copy jni function table at safepoint.
3600 VM_JNIFunctionTableCopier copier(function_table);
3601 VMThread::execute(&copier);
3602
3603 return JVMTI_ERROR_NONE;
3604 } /* end SetJNIFunctionTable */
3605
3606
3607 // function_table - pre-checked for null
3608 jvmtiError
3609 JvmtiEnv::GetJNIFunctionTable(jniNativeInterface** function_table) {
3610 *function_table=(jniNativeInterface*)jvmtiMalloc(sizeof(jniNativeInterface));
3611 if (*function_table == nullptr)
3612 return JVMTI_ERROR_OUT_OF_MEMORY;
3613 memcpy(*function_table,(JavaThread::current())->get_jni_functions(),sizeof(jniNativeInterface));
3614 return JVMTI_ERROR_NONE;
3615 } /* end GetJNIFunctionTable */
3616
3617
3618 //
3619 // Event Management functions
3620 //
3621
3622 jvmtiError
3623 JvmtiEnv::GenerateEvents(jvmtiEvent event_type) {
3624 // can only generate two event types
3625 if (event_type != JVMTI_EVENT_COMPILED_METHOD_LOAD &&
3626 event_type != JVMTI_EVENT_DYNAMIC_CODE_GENERATED) {
3627 return JVMTI_ERROR_ILLEGAL_ARGUMENT;
3628 }
3629
3630 // for compiled_method_load events we must check that the environment
3631 // has the can_generate_compiled_method_load_events capability.
3632 if (event_type == JVMTI_EVENT_COMPILED_METHOD_LOAD) {
3633 if (get_capabilities()->can_generate_compiled_method_load_events == 0) {
3634 return JVMTI_ERROR_MUST_POSSESS_CAPABILITY;
3635 }
3636 return JvmtiCodeBlobEvents::generate_compiled_method_load_events(this);
3637 } else {
3638 return JvmtiCodeBlobEvents::generate_dynamic_code_events(this);
3639 }
3640
3641 } /* end GenerateEvents */
3642
3643
3644 //
3645 // Extension Mechanism functions
3646 //
3647
3648 // extension_count_ptr - pre-checked for null
3649 // extensions - pre-checked for null
3650 jvmtiError
3651 JvmtiEnv::GetExtensionFunctions(jint* extension_count_ptr, jvmtiExtensionFunctionInfo** extensions) {
3652 return JvmtiExtensions::get_functions(this, extension_count_ptr, extensions);
3653 } /* end GetExtensionFunctions */
3654
3655
3656 // extension_count_ptr - pre-checked for null
3657 // extensions - pre-checked for null
3658 jvmtiError
3659 JvmtiEnv::GetExtensionEvents(jint* extension_count_ptr, jvmtiExtensionEventInfo** extensions) {
3660 return JvmtiExtensions::get_events(this, extension_count_ptr, extensions);
3661 } /* end GetExtensionEvents */
3662
3663
3664 // callback - null is a valid value, must be checked
3665 jvmtiError
3666 JvmtiEnv::SetExtensionEventCallback(jint extension_event_index, jvmtiExtensionEvent callback) {
3667 return JvmtiExtensions::set_event_callback(this, extension_event_index, callback);
3668 } /* end SetExtensionEventCallback */
3669
3670 //
3671 // Timers functions
3672 //
3673
3674 // info_ptr - pre-checked for null
3675 jvmtiError
3676 JvmtiEnv::GetCurrentThreadCpuTimerInfo(jvmtiTimerInfo* info_ptr) {
3677 os::current_thread_cpu_time_info(info_ptr);
3678 return JVMTI_ERROR_NONE;
3679 } /* end GetCurrentThreadCpuTimerInfo */
3680
3681
3682 // nanos_ptr - pre-checked for null
3683 jvmtiError
3684 JvmtiEnv::GetCurrentThreadCpuTime(jlong* nanos_ptr) {
3685 Thread* thread = Thread::current();
3686
3687 // Surprisingly the GetCurrentThreadCpuTime is used by non-JavaThread's.
3688 if (thread->is_Java_thread()) {
3689 if (JavaThread::cast(thread)->is_vthread_mounted()) {
3690 // No support for a VirtualThread (yet).
3691 return JVMTI_ERROR_UNSUPPORTED_OPERATION;
3692 }
3693 }
3694 *nanos_ptr = os::current_thread_cpu_time();
3695 return JVMTI_ERROR_NONE;
3696 } /* end GetCurrentThreadCpuTime */
3697
3698
3699 // info_ptr - pre-checked for null
3700 jvmtiError
3701 JvmtiEnv::GetThreadCpuTimerInfo(jvmtiTimerInfo* info_ptr) {
3702 os::thread_cpu_time_info(info_ptr);
3703 return JVMTI_ERROR_NONE;
3704 } /* end GetThreadCpuTimerInfo */
3705
3706
3707 // nanos_ptr - pre-checked for null
3708 jvmtiError
3709 JvmtiEnv::GetThreadCpuTime(jthread thread, jlong* nanos_ptr) {
3710 JavaThread* current_thread = JavaThread::current();
3711 ThreadsListHandle tlh(current_thread);
3712 JavaThread* java_thread = nullptr;
3713 oop thread_oop = nullptr;
3714
3715 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, current_thread, &java_thread, &thread_oop);
3716
3717 if (thread_oop != nullptr && thread_oop->is_a(vmClasses::BaseVirtualThread_klass())) {
3718 // No support for virtual threads (yet).
3719 return JVMTI_ERROR_UNSUPPORTED_OPERATION;
3720 }
3721 if (err != JVMTI_ERROR_NONE) {
3722 return err;
3723 }
3724 NULL_CHECK(nanos_ptr, JVMTI_ERROR_NULL_POINTER);
3725
3726 *nanos_ptr = os::thread_cpu_time(java_thread);
3727 return JVMTI_ERROR_NONE;
3728 } /* end GetThreadCpuTime */
3729
3730
3731 // info_ptr - pre-checked for null
3732 jvmtiError
3733 JvmtiEnv::GetTimerInfo(jvmtiTimerInfo* info_ptr) {
3734 os::javaTimeNanos_info(info_ptr);
3735 return JVMTI_ERROR_NONE;
3736 } /* end GetTimerInfo */
3737
3738
3739 // nanos_ptr - pre-checked for null
3740 jvmtiError
3741 JvmtiEnv::GetTime(jlong* nanos_ptr) {
3742 *nanos_ptr = os::javaTimeNanos();
3743 return JVMTI_ERROR_NONE;
3744 } /* end GetTime */
3745
3746
3747 // processor_count_ptr - pre-checked for null
3748 jvmtiError
3749 JvmtiEnv::GetAvailableProcessors(jint* processor_count_ptr) {
3750 *processor_count_ptr = os::active_processor_count();
3751 return JVMTI_ERROR_NONE;
3752 } /* end GetAvailableProcessors */
3753
3754 jvmtiError
3755 JvmtiEnv::SetHeapSamplingInterval(jint sampling_interval) {
3756 if (sampling_interval < 0) {
3757 return JVMTI_ERROR_ILLEGAL_ARGUMENT;
3758 }
3759 ThreadHeapSampler::set_sampling_interval(sampling_interval);
3760 return JVMTI_ERROR_NONE;
3761 } /* end SetHeapSamplingInterval */
3762
3763 //
3764 // System Properties functions
3765 //
3766
3767 // count_ptr - pre-checked for null
3768 // property_ptr - pre-checked for null
3769 jvmtiError
3770 JvmtiEnv::GetSystemProperties(jint* count_ptr, char*** property_ptr) {
3771 jvmtiError err = JVMTI_ERROR_NONE;
3772
3773 // Get the number of readable properties.
3774 *count_ptr = Arguments::PropertyList_readable_count(Arguments::system_properties());
3775
3776 // Allocate memory to hold the exact number of readable properties.
3777 err = allocate(*count_ptr * sizeof(char *), (unsigned char **)property_ptr);
3778 if (err != JVMTI_ERROR_NONE) {
3779 return err;
3780 }
3781 int readable_count = 0;
3782 // Loop through the system properties until all the readable properties are found.
3783 for (SystemProperty* p = Arguments::system_properties(); p != nullptr && readable_count < *count_ptr; p = p->next()) {
3784 if (p->readable()) {
3785 const char *key = p->key();
3786 char **tmp_value = *property_ptr+readable_count;
3787 readable_count++;
3788 err = allocate((strlen(key)+1) * sizeof(char), (unsigned char**)tmp_value);
3789 if (err == JVMTI_ERROR_NONE) {
3790 strcpy(*tmp_value, key);
3791 } else {
3792 // clean up previously allocated memory.
3793 for (int j = 0; j < readable_count; j++) {
3794 Deallocate((unsigned char*)*property_ptr+j);
3795 }
3796 Deallocate((unsigned char*)property_ptr);
3797 break;
3798 }
3799 }
3800 }
3801 assert(err != JVMTI_ERROR_NONE || readable_count == *count_ptr, "Bad readable property count");
3802 return err;
3803 } /* end GetSystemProperties */
3804
3805
3806 // property - pre-checked for null
3807 // value_ptr - pre-checked for null
3808 jvmtiError
3809 JvmtiEnv::GetSystemProperty(const char* property, char** value_ptr) {
3810 jvmtiError err = JVMTI_ERROR_NONE;
3811 const char *value;
3812
3813 // Return JVMTI_ERROR_NOT_AVAILABLE if property is not readable or doesn't exist.
3814 value = Arguments::PropertyList_get_readable_value(Arguments::system_properties(), property);
3815 if (value == nullptr) {
3816 err = JVMTI_ERROR_NOT_AVAILABLE;
3817 } else {
3818 err = allocate((strlen(value)+1) * sizeof(char), (unsigned char **)value_ptr);
3819 if (err == JVMTI_ERROR_NONE) {
3820 strcpy(*value_ptr, value);
3821 }
3822 }
3823 return err;
3824 } /* end GetSystemProperty */
3825
3826
3827 // property - pre-checked for null
3828 // value - null is a valid value, must be checked
3829 jvmtiError
3830 JvmtiEnv::SetSystemProperty(const char* property, const char* value_ptr) {
3831 for (SystemProperty* p = Arguments::system_properties(); p != nullptr; p = p->next()) {
3832 if (strcmp(property, p->key()) == 0) {
3833 if (p->writeable()) {
3834 if (p->set_value(value_ptr, AllocFailStrategy::RETURN_NULL)) {
3835 return JVMTI_ERROR_NONE;
3836 } else {
3837 return JVMTI_ERROR_OUT_OF_MEMORY;
3838 }
3839 } else {
3840 // We found a property, but it's not writeable
3841 return JVMTI_ERROR_NOT_AVAILABLE;
3842 }
3843 }
3844 }
3845
3846 // We cannot find a property of the given name
3847 return JVMTI_ERROR_NOT_AVAILABLE;
3848 } /* end SetSystemProperty */