1 /*
2 * Copyright (c) 2003, 2023, 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, &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, &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 ThreadsListHandle tlh;
590
591 JavaThread* java_thread = nullptr;
592 oop thread_obj = nullptr;
593 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), event_thread, &java_thread, &thread_obj);
594 if (err != JVMTI_ERROR_NONE) {
595 return err;
596 }
597
598 // global events cannot be controlled at thread level.
599 if (JvmtiEventController::is_global_event(event_type)) {
600 return JVMTI_ERROR_ILLEGAL_ARGUMENT;
601 }
602
603 JvmtiEventController::set_user_enabled(this, java_thread, thread_obj, event_type, enabled);
604 }
605
606 return JVMTI_ERROR_NONE;
607 } /* end SetEventNotificationMode */
608
609 //
610 // Capability functions
611 //
612
613 // capabilities_ptr - pre-checked for null
614 jvmtiError
615 JvmtiEnv::GetPotentialCapabilities(jvmtiCapabilities* capabilities_ptr) {
616 JvmtiManageCapabilities::get_potential_capabilities(get_capabilities(),
617 get_prohibited_capabilities(),
618 capabilities_ptr);
619 return JVMTI_ERROR_NONE;
620 } /* end GetPotentialCapabilities */
621
622
623 // capabilities_ptr - pre-checked for null
624 jvmtiError
625 JvmtiEnv::AddCapabilities(const jvmtiCapabilities* capabilities_ptr) {
626 return JvmtiManageCapabilities::add_capabilities(get_capabilities(),
627 get_prohibited_capabilities(),
628 capabilities_ptr,
629 get_capabilities());
630 } /* end AddCapabilities */
631
632
633 // capabilities_ptr - pre-checked for null
634 jvmtiError
635 JvmtiEnv::RelinquishCapabilities(const jvmtiCapabilities* capabilities_ptr) {
636 JvmtiManageCapabilities::relinquish_capabilities(get_capabilities(), capabilities_ptr, get_capabilities());
637 return JVMTI_ERROR_NONE;
638 } /* end RelinquishCapabilities */
639
640
641 // capabilities_ptr - pre-checked for null
642 jvmtiError
643 JvmtiEnv::GetCapabilities(jvmtiCapabilities* capabilities_ptr) {
644 JvmtiManageCapabilities::copy_capabilities(get_capabilities(), capabilities_ptr);
645 return JVMTI_ERROR_NONE;
646 } /* end GetCapabilities */
647
648 //
649 // Class Loader Search functions
650 //
651
652 // segment - pre-checked for null
653 jvmtiError
654 JvmtiEnv::AddToBootstrapClassLoaderSearch(const char* segment) {
655 jvmtiPhase phase = get_phase();
656 if (phase == JVMTI_PHASE_ONLOAD) {
657 Arguments::append_sysclasspath(segment);
658 return JVMTI_ERROR_NONE;
659 } else if (use_version_1_0_semantics()) {
660 // This JvmtiEnv requested version 1.0 semantics and this function
661 // is only allowed in the ONLOAD phase in version 1.0 so we need to
662 // return an error here.
663 return JVMTI_ERROR_WRONG_PHASE;
664 } else if (phase == JVMTI_PHASE_LIVE) {
665 // The phase is checked by the wrapper that called this function,
666 // but this thread could be racing with the thread that is
667 // terminating the VM so we check one more time.
668
669 // create the zip entry
670 ClassPathZipEntry* zip_entry = ClassLoader::create_class_path_zip_entry(segment, true);
671 if (zip_entry == nullptr) {
672 return JVMTI_ERROR_ILLEGAL_ARGUMENT;
673 }
674
675 // add the jar file to the bootclasspath
676 log_info(class, load)("opened: %s", zip_entry->name());
677 #if INCLUDE_CDS
678 ClassLoaderExt::append_boot_classpath(zip_entry);
679 #else
680 ClassLoader::add_to_boot_append_entries(zip_entry);
681 #endif
682 return JVMTI_ERROR_NONE;
683 } else {
684 return JVMTI_ERROR_WRONG_PHASE;
685 }
686
687 } /* end AddToBootstrapClassLoaderSearch */
688
689
690 // segment - pre-checked for null
691 jvmtiError
692 JvmtiEnv::AddToSystemClassLoaderSearch(const char* segment) {
693 jvmtiPhase phase = get_phase();
694
695 if (phase == JVMTI_PHASE_ONLOAD) {
696 for (SystemProperty* p = Arguments::system_properties(); p != nullptr; p = p->next()) {
697 if (strcmp("java.class.path", p->key()) == 0) {
698 p->append_value(segment);
699 break;
700 }
701 }
702 return JVMTI_ERROR_NONE;
703 } else if (phase == JVMTI_PHASE_LIVE) {
704 // The phase is checked by the wrapper that called this function,
705 // but this thread could be racing with the thread that is
706 // terminating the VM so we check one more time.
707 JavaThread* THREAD = JavaThread::current(); // For exception macros.
708 HandleMark hm(THREAD);
709
710 // create the zip entry (which will open the zip file and hence
711 // check that the segment is indeed a zip file).
712 ClassPathZipEntry* zip_entry = ClassLoader::create_class_path_zip_entry(segment, false);
713 if (zip_entry == nullptr) {
714 return JVMTI_ERROR_ILLEGAL_ARGUMENT;
715 }
716 delete zip_entry; // no longer needed
717
718 Handle loader(THREAD, SystemDictionary::java_system_loader());
719
720 // need the path as java.lang.String
721 Handle path = java_lang_String::create_from_platform_dependent_str(segment, THREAD);
722 if (HAS_PENDING_EXCEPTION) {
723 CLEAR_PENDING_EXCEPTION;
724 return JVMTI_ERROR_INTERNAL;
725 }
726
727 // Invoke the appendToClassPathForInstrumentation method - if the method
728 // is not found it means the loader doesn't support adding to the class path
729 // in the live phase.
730 {
731 JavaValue res(T_VOID);
732 JavaCalls::call_special(&res,
733 loader,
734 loader->klass(),
735 vmSymbols::appendToClassPathForInstrumentation_name(),
736 vmSymbols::appendToClassPathForInstrumentation_signature(),
737 path,
738 THREAD);
739 if (HAS_PENDING_EXCEPTION) {
740 Symbol* ex_name = PENDING_EXCEPTION->klass()->name();
741 CLEAR_PENDING_EXCEPTION;
742
743 if (ex_name == vmSymbols::java_lang_NoSuchMethodError()) {
744 return JVMTI_ERROR_CLASS_LOADER_UNSUPPORTED;
745 } else {
746 return JVMTI_ERROR_INTERNAL;
747 }
748 }
749 }
750
751 return JVMTI_ERROR_NONE;
752 } else {
753 return JVMTI_ERROR_WRONG_PHASE;
754 }
755 } /* end AddToSystemClassLoaderSearch */
756
757 //
758 // General functions
759 //
760
761 // phase_ptr - pre-checked for null
762 jvmtiError
763 JvmtiEnv::GetPhase(jvmtiPhase* phase_ptr) {
764 *phase_ptr = phase();
765 return JVMTI_ERROR_NONE;
766 } /* end GetPhase */
767
768
769 jvmtiError
770 JvmtiEnv::DisposeEnvironment() {
771 dispose();
772 return JVMTI_ERROR_NONE;
773 } /* end DisposeEnvironment */
774
775
776 // data - null is a valid value, must be checked
777 jvmtiError
778 JvmtiEnv::SetEnvironmentLocalStorage(const void* data) {
779 set_env_local_storage(data);
780 return JVMTI_ERROR_NONE;
781 } /* end SetEnvironmentLocalStorage */
782
783
784 // data_ptr - pre-checked for null
785 jvmtiError
786 JvmtiEnv::GetEnvironmentLocalStorage(void** data_ptr) {
787 *data_ptr = (void*)get_env_local_storage();
788 return JVMTI_ERROR_NONE;
789 } /* end GetEnvironmentLocalStorage */
790
791 // version_ptr - pre-checked for null
792 jvmtiError
793 JvmtiEnv::GetVersionNumber(jint* version_ptr) {
794 *version_ptr = JVMTI_VERSION;
795 return JVMTI_ERROR_NONE;
796 } /* end GetVersionNumber */
797
798
799 // name_ptr - pre-checked for null
800 jvmtiError
801 JvmtiEnv::GetErrorName(jvmtiError error, char** name_ptr) {
802 if (error < JVMTI_ERROR_NONE || error > JVMTI_ERROR_MAX) {
803 return JVMTI_ERROR_ILLEGAL_ARGUMENT;
804 }
805 const char *name = JvmtiUtil::error_name(error);
806 if (name == nullptr) {
807 return JVMTI_ERROR_ILLEGAL_ARGUMENT;
808 }
809 size_t len = strlen(name) + 1;
810 jvmtiError err = allocate(len, (unsigned char**)name_ptr);
811 if (err == JVMTI_ERROR_NONE) {
812 memcpy(*name_ptr, name, len);
813 }
814 return err;
815 } /* end GetErrorName */
816
817
818 jvmtiError
819 JvmtiEnv::SetVerboseFlag(jvmtiVerboseFlag flag, jboolean value) {
820 LogLevelType level = value == 0 ? LogLevel::Off : LogLevel::Info;
821 switch (flag) {
822 case JVMTI_VERBOSE_OTHER:
823 // ignore
824 break;
825 case JVMTI_VERBOSE_CLASS:
826 LogConfiguration::configure_stdout(level, false, LOG_TAGS(class, unload));
827 LogConfiguration::configure_stdout(level, false, LOG_TAGS(class, load));
828 break;
829 case JVMTI_VERBOSE_GC:
830 LogConfiguration::configure_stdout(level, true, LOG_TAGS(gc));
831 break;
832 case JVMTI_VERBOSE_JNI:
833 level = value == 0 ? LogLevel::Off : LogLevel::Debug;
834 LogConfiguration::configure_stdout(level, true, LOG_TAGS(jni, resolve));
835 break;
836 default:
837 return JVMTI_ERROR_ILLEGAL_ARGUMENT;
838 };
839 return JVMTI_ERROR_NONE;
840 } /* end SetVerboseFlag */
841
842
843 // format_ptr - pre-checked for null
844 jvmtiError
845 JvmtiEnv::GetJLocationFormat(jvmtiJlocationFormat* format_ptr) {
846 *format_ptr = JVMTI_JLOCATION_JVMBCI;
847 return JVMTI_ERROR_NONE;
848 } /* end GetJLocationFormat */
849
850 //
851 // Thread functions
852 //
853
854 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
855 // thread_state_ptr - pre-checked for null
856 jvmtiError
857 JvmtiEnv::GetThreadState(jthread thread, jint* thread_state_ptr) {
858 JavaThread* current_thread = JavaThread::current();
859 JvmtiVTMSTransitionDisabler disabler(thread);
860 ThreadsListHandle tlh(current_thread);
861
862 JavaThread* java_thread = nullptr;
863 oop thread_oop = nullptr;
864 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, &java_thread, &thread_oop);
865 if (err != JVMTI_ERROR_NONE && err != JVMTI_ERROR_THREAD_NOT_ALIVE) {
866 // We got an error code so we don't have a JavaThread*, but only
867 // return an error from here if the error is not because the thread
868 // is a virtual thread.
869 return err;
870 }
871
872 if (java_lang_VirtualThread::is_instance(thread_oop)) {
873 *thread_state_ptr = JvmtiEnvBase::get_vthread_state(thread_oop, java_thread);
874 } else {
875 *thread_state_ptr = JvmtiEnvBase::get_thread_state(thread_oop, java_thread);
876 }
877 return JVMTI_ERROR_NONE;
878 } /* end GetThreadState */
879
880
881 // thread_ptr - pre-checked for null
882 jvmtiError
883 JvmtiEnv::GetCurrentThread(jthread* thread_ptr) {
884 JavaThread* cur_thread = JavaThread::current();
885 oop thread_oop = get_vthread_or_thread_oop(cur_thread);
886
887 *thread_ptr = (jthread)JNIHandles::make_local(cur_thread, thread_oop);
888 return JVMTI_ERROR_NONE;
889 } /* end GetCurrentThread */
890
891
892 // threads_count_ptr - pre-checked for null
893 // threads_ptr - pre-checked for null
894 jvmtiError
895 JvmtiEnv::GetAllThreads(jint* threads_count_ptr, jthread** threads_ptr) {
896 int nthreads = 0;
897 Handle *thread_objs = nullptr;
898 Thread* current_thread = Thread::current();
899 ResourceMark rm(current_thread);
900 HandleMark hm(current_thread);
901
902 // enumerate threads (including agent threads)
903 ThreadsListEnumerator tle(current_thread, true);
904 nthreads = tle.num_threads();
905 *threads_count_ptr = nthreads;
906
907 if (nthreads == 0) {
908 *threads_ptr = nullptr;
909 return JVMTI_ERROR_NONE;
910 }
911
912 thread_objs = NEW_RESOURCE_ARRAY(Handle, nthreads);
913 NULL_CHECK(thread_objs, JVMTI_ERROR_OUT_OF_MEMORY);
914
915 for (int i = 0; i < nthreads; i++) {
916 thread_objs[i] = Handle(tle.get_threadObj(i));
917 }
918
919 jthread *jthreads = new_jthreadArray(nthreads, thread_objs);
920 NULL_CHECK(jthreads, JVMTI_ERROR_OUT_OF_MEMORY);
921
922 *threads_ptr = jthreads;
923 return JVMTI_ERROR_NONE;
924 } /* end GetAllThreads */
925
926
927 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
928 jvmtiError
929 JvmtiEnv::SuspendThread(jthread thread) {
930 JavaThread* current = JavaThread::current();
931 HandleMark hm(current);
932 Handle self_tobj;
933
934 jvmtiError err;
935 {
936 JvmtiVTMSTransitionDisabler disabler(true);
937 ThreadsListHandle tlh(current);
938 JavaThread* java_thread = nullptr;
939 oop thread_oop = nullptr;
940
941 err = get_threadOop_and_JavaThread(tlh.list(), thread, &java_thread, &thread_oop);
942 if (err != JVMTI_ERROR_NONE) {
943 return err;
944 }
945
946 // Do not use JvmtiVTMSTransitionDisabler in context of self suspend to avoid deadlocks.
947 if (java_thread != current) {
948 err = suspend_thread(thread_oop, java_thread, /* single_suspend */ true, nullptr);
949 return err;
950 }
951 // protect thread_oop as a safepoint can be reached in disabler destructor
952 self_tobj = Handle(current, thread_oop);
953 }
954 // Do self suspend for current JavaThread.
955 err = suspend_thread(self_tobj(), current, /* single_suspend */ true, nullptr);
956 return err;
957 } /* end SuspendThread */
958
959
960 // request_count - pre-checked to be greater than or equal to 0
961 // request_list - pre-checked for null
962 // results - pre-checked for null
963 jvmtiError
964 JvmtiEnv::SuspendThreadList(jint request_count, const jthread* request_list, jvmtiError* results) {
965 JavaThread* current = JavaThread::current();
966 HandleMark hm(current);
967 Handle self_tobj;
968 int self_idx = -1;
969
970 {
971 JvmtiVTMSTransitionDisabler disabler(true);
972 ThreadsListHandle tlh(current);
973
974 for (int i = 0; i < request_count; i++) {
975 JavaThread *java_thread = nullptr;
976 oop thread_oop = nullptr;
977 jthread thread = request_list[i];
978 jvmtiError err = JvmtiExport::cv_external_thread_to_JavaThread(tlh.list(), thread, &java_thread, &thread_oop);
979
980 if (thread_oop != nullptr &&
981 java_lang_VirtualThread::is_instance(thread_oop) &&
982 !JvmtiEnvBase::is_vthread_alive(thread_oop)) {
983 err = JVMTI_ERROR_THREAD_NOT_ALIVE;
984 }
985 if (err != JVMTI_ERROR_NONE) {
986 if (thread_oop == nullptr || err != JVMTI_ERROR_INVALID_THREAD) {
987 results[i] = err;
988 continue;
989 }
990 }
991 if (java_thread == current) {
992 self_idx = i;
993 self_tobj = Handle(current, thread_oop);
994 continue; // self suspend after all other suspends
995 }
996 results[i] = suspend_thread(thread_oop, java_thread, /* single_suspend */ true, nullptr);
997 }
998 }
999 // Self suspend after all other suspends if necessary.
1000 // Do not use JvmtiVTMSTransitionDisabler in context of self suspend to avoid deadlocks.
1001 if (self_tobj() != nullptr) {
1002 // there should not be any error for current java_thread
1003 results[self_idx] = suspend_thread(self_tobj(), current, /* single_suspend */ true, nullptr);
1004 }
1005 // per-thread suspend results returned via results parameter
1006 return JVMTI_ERROR_NONE;
1007 } /* end SuspendThreadList */
1008
1009
1010 jvmtiError
1011 JvmtiEnv::SuspendAllVirtualThreads(jint except_count, const jthread* except_list) {
1012 if (!JvmtiExport::can_support_virtual_threads()) {
1013 return JVMTI_ERROR_MUST_POSSESS_CAPABILITY;
1014 }
1015 JavaThread* current = JavaThread::current();
1016 HandleMark hm(current);
1017 Handle self_tobj;
1018
1019 {
1020 ResourceMark rm(current);
1021 JvmtiVTMSTransitionDisabler disabler(true);
1022 ThreadsListHandle tlh(current);
1023 GrowableArray<jthread>* elist = new GrowableArray<jthread>(except_count);
1024
1025 jvmtiError err = JvmtiEnvBase::check_thread_list(except_count, except_list);
1026 if (err != JVMTI_ERROR_NONE) {
1027 return err;
1028 }
1029
1030 // Collect threads from except_list for which resumed status must be restored (only for VirtualThread case)
1031 for (int idx = 0; idx < except_count; idx++) {
1032 jthread thread = except_list[idx];
1033 oop thread_oop = JNIHandles::resolve_external_guard(thread);
1034 if (java_lang_VirtualThread::is_instance(thread_oop) && !JvmtiVTSuspender::is_vthread_suspended(thread_oop)) {
1035 // is not suspended, so its resumed status must be restored
1036 elist->append(except_list[idx]);
1037 }
1038 }
1039
1040 for (JavaThreadIteratorWithHandle jtiwh; JavaThread *java_thread = jtiwh.next(); ) {
1041 oop vt_oop = java_thread->jvmti_vthread();
1042 if (!java_thread->is_exiting() &&
1043 !java_thread->is_jvmti_agent_thread() &&
1044 !java_thread->is_hidden_from_external_view() &&
1045 vt_oop != nullptr &&
1046 ((java_lang_VirtualThread::is_instance(vt_oop) &&
1047 JvmtiEnvBase::is_vthread_alive(vt_oop) &&
1048 !JvmtiVTSuspender::is_vthread_suspended(vt_oop)) ||
1049 (vt_oop->is_a(vmClasses::BoundVirtualThread_klass()) && !java_thread->is_suspended())) &&
1050 !is_in_thread_list(except_count, except_list, vt_oop)
1051 ) {
1052 if (java_thread == current) {
1053 self_tobj = Handle(current, vt_oop);
1054 continue; // self suspend after all other suspends
1055 }
1056 suspend_thread(vt_oop, java_thread, /* single_suspend */ false, nullptr);
1057 }
1058 }
1059 JvmtiVTSuspender::register_all_vthreads_suspend();
1060
1061 // Restore resumed state for threads from except list that were not suspended before.
1062 for (int idx = 0; idx < elist->length(); idx++) {
1063 jthread thread = elist->at(idx);
1064 oop thread_oop = JNIHandles::resolve_external_guard(thread);
1065 if (JvmtiVTSuspender::is_vthread_suspended(thread_oop)) {
1066 JvmtiVTSuspender::register_vthread_resume(thread_oop);
1067 }
1068 }
1069 }
1070 // Self suspend after all other suspends if necessary.
1071 // Do not use JvmtiVTMSTransitionDisabler in context of self suspend to avoid deadlocks.
1072 if (self_tobj() != nullptr) {
1073 suspend_thread(self_tobj(), current, /* single_suspend */ false, nullptr);
1074 }
1075 return JVMTI_ERROR_NONE;
1076 } /* end SuspendAllVirtualThreads */
1077
1078
1079 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
1080 jvmtiError
1081 JvmtiEnv::ResumeThread(jthread thread) {
1082 JvmtiVTMSTransitionDisabler disabler(true);
1083 ThreadsListHandle tlh;
1084
1085 JavaThread* java_thread = nullptr;
1086 oop thread_oop = nullptr;
1087 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, &java_thread, &thread_oop);
1088 if (err != JVMTI_ERROR_NONE) {
1089 return err;
1090 }
1091 err = resume_thread(thread_oop, java_thread, /* single_resume */ true);
1092 return err;
1093 } /* end ResumeThread */
1094
1095
1096 // request_count - pre-checked to be greater than or equal to 0
1097 // request_list - pre-checked for null
1098 // results - pre-checked for null
1099 jvmtiError
1100 JvmtiEnv::ResumeThreadList(jint request_count, const jthread* request_list, jvmtiError* results) {
1101 oop thread_oop = nullptr;
1102 JavaThread* java_thread = nullptr;
1103 JvmtiVTMSTransitionDisabler disabler(true);
1104 ThreadsListHandle tlh;
1105
1106 for (int i = 0; i < request_count; i++) {
1107 jthread thread = request_list[i];
1108 jvmtiError err = JvmtiExport::cv_external_thread_to_JavaThread(tlh.list(), thread, &java_thread, &thread_oop);
1109
1110 if (thread_oop != nullptr &&
1111 java_lang_VirtualThread::is_instance(thread_oop) &&
1112 !JvmtiEnvBase::is_vthread_alive(thread_oop)) {
1113 err = JVMTI_ERROR_THREAD_NOT_ALIVE;
1114 }
1115 if (err != JVMTI_ERROR_NONE) {
1116 if (thread_oop == nullptr || err != JVMTI_ERROR_INVALID_THREAD) {
1117 results[i] = err;
1118 continue;
1119 }
1120 }
1121 results[i] = resume_thread(thread_oop, java_thread, /* single_resume */ true);
1122 }
1123 // per-thread resume results returned via results parameter
1124 return JVMTI_ERROR_NONE;
1125 } /* end ResumeThreadList */
1126
1127
1128 jvmtiError
1129 JvmtiEnv::ResumeAllVirtualThreads(jint except_count, const jthread* except_list) {
1130 if (!JvmtiExport::can_support_virtual_threads()) {
1131 return JVMTI_ERROR_MUST_POSSESS_CAPABILITY;
1132 }
1133 jvmtiError err = JvmtiEnvBase::check_thread_list(except_count, except_list);
1134 if (err != JVMTI_ERROR_NONE) {
1135 return err;
1136 }
1137 ResourceMark rm;
1138 JvmtiVTMSTransitionDisabler disabler(true);
1139 GrowableArray<jthread>* elist = new GrowableArray<jthread>(except_count);
1140
1141 // Collect threads from except_list for which suspended status must be restored (only for VirtualThread case)
1142 for (int idx = 0; idx < except_count; idx++) {
1143 jthread thread = except_list[idx];
1144 oop thread_oop = JNIHandles::resolve_external_guard(thread);
1145 if (java_lang_VirtualThread::is_instance(thread_oop) && JvmtiVTSuspender::is_vthread_suspended(thread_oop)) {
1146 // is suspended, so its suspended status must be restored
1147 elist->append(except_list[idx]);
1148 }
1149 }
1150
1151 for (JavaThreadIteratorWithHandle jtiwh; JavaThread *java_thread = jtiwh.next(); ) {
1152 oop vt_oop = java_thread->jvmti_vthread();
1153 if (!java_thread->is_exiting() &&
1154 !java_thread->is_jvmti_agent_thread() &&
1155 !java_thread->is_hidden_from_external_view() &&
1156 vt_oop != nullptr &&
1157 ((java_lang_VirtualThread::is_instance(vt_oop) &&
1158 JvmtiEnvBase::is_vthread_alive(vt_oop) &&
1159 JvmtiVTSuspender::is_vthread_suspended(vt_oop)) ||
1160 (vt_oop->is_a(vmClasses::BoundVirtualThread_klass()) && java_thread->is_suspended())) &&
1161 !is_in_thread_list(except_count, except_list, vt_oop)
1162 ) {
1163 resume_thread(vt_oop, java_thread, /* single_resume */ false);
1164 }
1165 }
1166 JvmtiVTSuspender::register_all_vthreads_resume();
1167
1168 // Restore suspended state for threads from except list that were suspended before.
1169 for (int idx = 0; idx < elist->length(); idx++) {
1170 jthread thread = elist->at(idx);
1171 oop thread_oop = JNIHandles::resolve_external_guard(thread);
1172 if (!JvmtiVTSuspender::is_vthread_suspended(thread_oop)) {
1173 JvmtiVTSuspender::register_vthread_suspend(thread_oop);
1174 }
1175 }
1176 return JVMTI_ERROR_NONE;
1177 } /* end ResumeAllVirtualThreads */
1178
1179
1180 jvmtiError
1181 JvmtiEnv::StopThread(jthread thread, jobject exception) {
1182 JavaThread* current_thread = JavaThread::current();
1183
1184 JvmtiVTMSTransitionDisabler disabler(thread);
1185 ThreadsListHandle tlh(current_thread);
1186 JavaThread* java_thread = nullptr;
1187 oop thread_oop = nullptr;
1188
1189 NULL_CHECK(thread, JVMTI_ERROR_INVALID_THREAD);
1190
1191 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, &java_thread, &thread_oop);
1192
1193 bool is_virtual = thread_oop != nullptr && thread_oop->is_a(vmClasses::BaseVirtualThread_klass());
1194
1195 if (is_virtual && !is_JavaThread_current(java_thread, thread_oop)) {
1196 if (!is_vthread_suspended(thread_oop, java_thread)) {
1197 return JVMTI_ERROR_THREAD_NOT_SUSPENDED;
1198 }
1199 if (java_thread == nullptr) { // unmounted virtual thread
1200 return JVMTI_ERROR_OPAQUE_FRAME;
1201 }
1202 }
1203 if (err != JVMTI_ERROR_NONE) {
1204 return err;
1205 }
1206 oop e = JNIHandles::resolve_external_guard(exception);
1207 NULL_CHECK(e, JVMTI_ERROR_NULL_POINTER);
1208
1209 JavaThread::send_async_exception(java_thread, e);
1210
1211 return JVMTI_ERROR_NONE;
1212
1213 } /* end StopThread */
1214
1215
1216 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
1217 jvmtiError
1218 JvmtiEnv::InterruptThread(jthread thread) {
1219 JavaThread* current_thread = JavaThread::current();
1220 HandleMark hm(current_thread);
1221
1222 JvmtiVTMSTransitionDisabler disabler(thread);
1223 ThreadsListHandle tlh(current_thread);
1224
1225 JavaThread* java_thread = nullptr;
1226 oop thread_obj = nullptr;
1227 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, &java_thread, &thread_obj);
1228 if (err != JVMTI_ERROR_NONE) {
1229 return err;
1230 }
1231
1232 if (java_lang_VirtualThread::is_instance(thread_obj)) {
1233 // For virtual threads we have to call into Java to interrupt:
1234 Handle obj(current_thread, thread_obj);
1235 JavaValue result(T_VOID);
1236 JavaCalls::call_virtual(&result,
1237 obj,
1238 vmClasses::Thread_klass(),
1239 vmSymbols::interrupt_method_name(),
1240 vmSymbols::void_method_signature(),
1241 current_thread);
1242
1243 return JVMTI_ERROR_NONE;
1244 }
1245
1246 // Really this should be a Java call to Thread.interrupt to ensure the same
1247 // semantics, however historically this has not been done for some reason.
1248 // So we continue with that (which means we don't interact with any Java-level
1249 // Interruptible object) but we must set the Java-level interrupted state.
1250 java_lang_Thread::set_interrupted(thread_obj, true);
1251 java_thread->interrupt();
1252
1253 return JVMTI_ERROR_NONE;
1254 } /* end InterruptThread */
1255
1256
1257 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
1258 // info_ptr - pre-checked for null
1259 jvmtiError
1260 JvmtiEnv::GetThreadInfo(jthread thread, jvmtiThreadInfo* info_ptr) {
1261 JavaThread* current_thread = JavaThread::current();
1262 ResourceMark rm(current_thread);
1263 HandleMark hm(current_thread);
1264 JavaThread* java_thread = nullptr;
1265 oop thread_oop = nullptr;
1266
1267 JvmtiVTMSTransitionDisabler disabler(thread);
1268 ThreadsListHandle tlh(current_thread);
1269
1270 // if thread is null the current thread is used
1271 if (thread == nullptr) {
1272 java_thread = JavaThread::current();
1273 thread_oop = get_vthread_or_thread_oop(java_thread);
1274 if (thread_oop == nullptr || !thread_oop->is_a(vmClasses::Thread_klass())) {
1275 return JVMTI_ERROR_INVALID_THREAD;
1276 }
1277 } else {
1278 jvmtiError err = JvmtiExport::cv_external_thread_to_JavaThread(tlh.list(), thread, &java_thread, &thread_oop);
1279 if (err != JVMTI_ERROR_NONE) {
1280 // We got an error code so we don't have a JavaThread *, but
1281 // only return an error from here if we didn't get a valid
1282 // thread_oop.
1283 // In the virtual thread case the cv_external_thread_to_JavaThread is expected to correctly set
1284 // the thread_oop and return JVMTI_ERROR_INVALID_THREAD which we ignore here.
1285 if (thread_oop == nullptr) {
1286 return err;
1287 }
1288 }
1289 }
1290 // We have a valid thread_oop so we can return some thread info.
1291
1292 Handle thread_obj(current_thread, thread_oop);
1293 Handle name;
1294 ThreadPriority priority;
1295 Handle thread_group;
1296 Handle context_class_loader;
1297 bool is_daemon;
1298
1299 name = Handle(current_thread, java_lang_Thread::name(thread_obj()));
1300
1301 if (java_lang_VirtualThread::is_instance(thread_obj())) {
1302 priority = (ThreadPriority)JVMTI_THREAD_NORM_PRIORITY;
1303 is_daemon = true;
1304 if (java_lang_VirtualThread::state(thread_obj()) == java_lang_VirtualThread::TERMINATED) {
1305 thread_group = Handle(current_thread, nullptr);
1306 } else {
1307 thread_group = Handle(current_thread, java_lang_Thread_Constants::get_VTHREAD_GROUP());
1308 }
1309 } else {
1310 priority = java_lang_Thread::priority(thread_obj());
1311 is_daemon = java_lang_Thread::is_daemon(thread_obj());
1312 if (java_lang_Thread::get_thread_status(thread_obj()) == JavaThreadStatus::TERMINATED) {
1313 thread_group = Handle(current_thread, nullptr);
1314 } else {
1315 thread_group = Handle(current_thread, java_lang_Thread::threadGroup(thread_obj()));
1316 }
1317 }
1318
1319 oop loader = java_lang_Thread::context_class_loader(thread_obj());
1320 context_class_loader = Handle(current_thread, loader);
1321
1322 { const char *n;
1323
1324 if (name() != nullptr) {
1325 n = java_lang_String::as_utf8_string(name());
1326 } else {
1327 int utf8_length = 0;
1328 n = UNICODE::as_utf8((jchar*) nullptr, utf8_length);
1329 }
1330
1331 info_ptr->name = (char *) jvmtiMalloc(strlen(n)+1);
1332 if (info_ptr->name == nullptr)
1333 return JVMTI_ERROR_OUT_OF_MEMORY;
1334
1335 strcpy(info_ptr->name, n);
1336 }
1337 info_ptr->is_daemon = is_daemon;
1338 info_ptr->priority = priority;
1339
1340 info_ptr->context_class_loader = (context_class_loader.is_null()) ? nullptr :
1341 jni_reference(context_class_loader);
1342 info_ptr->thread_group = jni_reference(thread_group);
1343
1344 return JVMTI_ERROR_NONE;
1345 } /* end GetThreadInfo */
1346
1347
1348 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
1349 // owned_monitor_count_ptr - pre-checked for null
1350 // owned_monitors_ptr - pre-checked for null
1351 jvmtiError
1352 JvmtiEnv::GetOwnedMonitorInfo(jthread thread, jint* owned_monitor_count_ptr, jobject** owned_monitors_ptr) {
1353 JavaThread* calling_thread = JavaThread::current();
1354 HandleMark hm(calling_thread);
1355
1356 // growable array of jvmti monitors info on the C-heap
1357 GrowableArray<jvmtiMonitorStackDepthInfo*> *owned_monitors_list =
1358 new (mtServiceability) GrowableArray<jvmtiMonitorStackDepthInfo*>(1, mtServiceability);
1359
1360 JvmtiVTMSTransitionDisabler disabler(thread);
1361 ThreadsListHandle tlh(calling_thread);
1362
1363 JavaThread* java_thread = nullptr;
1364 oop thread_oop = nullptr;
1365 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, &java_thread, &thread_oop);
1366 if (err != JVMTI_ERROR_NONE) {
1367 delete owned_monitors_list;
1368 return err;
1369 }
1370
1371 if (java_lang_VirtualThread::is_instance(thread_oop)) {
1372 // There is no monitor info to collect if target virtual thread is unmounted.
1373 if (java_thread != nullptr) {
1374 VirtualThreadGetOwnedMonitorInfoClosure op(this,
1375 Handle(calling_thread, thread_oop),
1376 owned_monitors_list);
1377 Handshake::execute(&op, java_thread);
1378 err = op.result();
1379 }
1380 } else {
1381 EscapeBarrier eb(true, calling_thread, java_thread);
1382 if (!eb.deoptimize_objects(MaxJavaStackTraceDepth)) {
1383 delete owned_monitors_list;
1384 return JVMTI_ERROR_OUT_OF_MEMORY;
1385 }
1386
1387 if (java_thread == calling_thread) {
1388 // It is only safe to make a direct call on the current thread.
1389 // All other usage needs to use a direct handshake for safety.
1390 err = get_owned_monitors(calling_thread, java_thread, owned_monitors_list);
1391 } else {
1392 // get owned monitors info with handshake
1393 GetOwnedMonitorInfoClosure op(calling_thread, this, owned_monitors_list);
1394 Handshake::execute(&op, java_thread);
1395 err = op.result();
1396 }
1397 }
1398
1399 jint owned_monitor_count = owned_monitors_list->length();
1400 if (err == JVMTI_ERROR_NONE) {
1401 if ((err = allocate(owned_monitor_count * sizeof(jobject *),
1402 (unsigned char**)owned_monitors_ptr)) == JVMTI_ERROR_NONE) {
1403 // copy into the returned array
1404 for (int i = 0; i < owned_monitor_count; i++) {
1405 (*owned_monitors_ptr)[i] =
1406 ((jvmtiMonitorStackDepthInfo*)owned_monitors_list->at(i))->monitor;
1407 }
1408 *owned_monitor_count_ptr = owned_monitor_count;
1409 }
1410 }
1411 // clean up.
1412 for (int i = 0; i < owned_monitor_count; i++) {
1413 deallocate((unsigned char*)owned_monitors_list->at(i));
1414 }
1415 delete owned_monitors_list;
1416
1417 return err;
1418 } /* end GetOwnedMonitorInfo */
1419
1420
1421 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
1422 // monitor_info_count_ptr - pre-checked for null
1423 // monitor_info_ptr - pre-checked for null
1424 jvmtiError
1425 JvmtiEnv::GetOwnedMonitorStackDepthInfo(jthread thread, jint* monitor_info_count_ptr, jvmtiMonitorStackDepthInfo** monitor_info_ptr) {
1426 JavaThread* calling_thread = JavaThread::current();
1427 HandleMark hm(calling_thread);
1428
1429 // growable array of jvmti monitors info on the C-heap
1430 GrowableArray<jvmtiMonitorStackDepthInfo*> *owned_monitors_list =
1431 new (mtServiceability) GrowableArray<jvmtiMonitorStackDepthInfo*>(1, mtServiceability);
1432
1433 JvmtiVTMSTransitionDisabler disabler(thread);
1434 ThreadsListHandle tlh(calling_thread);
1435
1436 JavaThread* java_thread = nullptr;
1437 oop thread_oop = nullptr;
1438 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, &java_thread, &thread_oop);
1439 if (err != JVMTI_ERROR_NONE) {
1440 delete owned_monitors_list;
1441 return err;
1442 }
1443
1444 if (java_lang_VirtualThread::is_instance(thread_oop)) {
1445 // There is no monitor info to collect if target virtual thread is unmounted.
1446 if (java_thread != nullptr) {
1447 VirtualThreadGetOwnedMonitorInfoClosure op(this,
1448 Handle(calling_thread, thread_oop),
1449 owned_monitors_list);
1450 Handshake::execute(&op, java_thread);
1451 err = op.result();
1452 }
1453 } else {
1454 EscapeBarrier eb(true, calling_thread, java_thread);
1455 if (!eb.deoptimize_objects(MaxJavaStackTraceDepth)) {
1456 delete owned_monitors_list;
1457 return JVMTI_ERROR_OUT_OF_MEMORY;
1458 }
1459
1460 if (java_thread == calling_thread) {
1461 // It is only safe to make a direct call on the current thread.
1462 // All other usage needs to use a direct handshake for safety.
1463 err = get_owned_monitors(calling_thread, java_thread, owned_monitors_list);
1464 } else {
1465 // get owned monitors info with handshake
1466 GetOwnedMonitorInfoClosure op(calling_thread, this, owned_monitors_list);
1467 Handshake::execute(&op, java_thread);
1468 err = op.result();
1469 }
1470 }
1471 jint owned_monitor_count = owned_monitors_list->length();
1472 if (err == JVMTI_ERROR_NONE) {
1473 if ((err = allocate(owned_monitor_count * sizeof(jvmtiMonitorStackDepthInfo),
1474 (unsigned char**)monitor_info_ptr)) == JVMTI_ERROR_NONE) {
1475 // copy to output array.
1476 for (int i = 0; i < owned_monitor_count; i++) {
1477 (*monitor_info_ptr)[i].monitor =
1478 ((jvmtiMonitorStackDepthInfo*)owned_monitors_list->at(i))->monitor;
1479 (*monitor_info_ptr)[i].stack_depth =
1480 ((jvmtiMonitorStackDepthInfo*)owned_monitors_list->at(i))->stack_depth;
1481 }
1482 }
1483 *monitor_info_count_ptr = owned_monitor_count;
1484 }
1485
1486 // clean up.
1487 for (int i = 0; i < owned_monitor_count; i++) {
1488 deallocate((unsigned char*)owned_monitors_list->at(i));
1489 }
1490 delete owned_monitors_list;
1491
1492 return err;
1493 } /* end GetOwnedMonitorStackDepthInfo */
1494
1495
1496 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
1497 // monitor_ptr - pre-checked for null
1498 jvmtiError
1499 JvmtiEnv::GetCurrentContendedMonitor(jthread thread, jobject* monitor_ptr) {
1500 JavaThread* calling_thread = JavaThread::current();
1501 HandleMark hm(calling_thread);
1502
1503 JvmtiVTMSTransitionDisabler disabler(thread);
1504 ThreadsListHandle tlh(calling_thread);
1505
1506 JavaThread* java_thread = nullptr;
1507 oop thread_oop = nullptr;
1508 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, &java_thread, &thread_oop);
1509 if (err != JVMTI_ERROR_NONE) {
1510 return err;
1511 }
1512
1513 if (java_lang_VirtualThread::is_instance(thread_oop)) {
1514 // There is no monitor info to collect if target virtual thread is unmounted.
1515 if (java_thread != nullptr) {
1516 GetCurrentContendedMonitorClosure op(calling_thread, this, monitor_ptr, /* is_virtual */ true);
1517 Handshake::execute(&op, java_thread);
1518 err = op.result();
1519 } else {
1520 *monitor_ptr = nullptr;
1521 if (!JvmtiEnvBase::is_vthread_alive(thread_oop)) {
1522 err = JVMTI_ERROR_THREAD_NOT_ALIVE;
1523 }
1524 }
1525 return err;
1526 }
1527 if (java_thread == calling_thread) {
1528 // It is only safe to make a direct call on the current thread.
1529 // All other usage needs to use a direct handshake for safety.
1530 err = get_current_contended_monitor(calling_thread, java_thread, monitor_ptr, /* is_virtual */ false);
1531 } else {
1532 // get contended monitor information with handshake
1533 GetCurrentContendedMonitorClosure op(calling_thread, this, monitor_ptr, /* is_virtual */ false);
1534 Handshake::execute(&op, java_thread);
1535 err = op.result();
1536 }
1537 return err;
1538 } /* end GetCurrentContendedMonitor */
1539
1540
1541 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
1542 // proc - pre-checked for null
1543 // arg - null is a valid value, must be checked
1544 jvmtiError
1545 JvmtiEnv::RunAgentThread(jthread thread, jvmtiStartFunction proc, const void* arg, jint priority) {
1546 JavaThread* current_thread = JavaThread::current();
1547
1548 JavaThread* java_thread = nullptr;
1549 oop thread_oop = nullptr;
1550 ThreadsListHandle tlh(current_thread);
1551 jvmtiError err = JvmtiExport::cv_external_thread_to_JavaThread(tlh.list(), thread, &java_thread, &thread_oop);
1552 if (err != JVMTI_ERROR_NONE) {
1553 // We got an error code so we don't have a JavaThread *, but
1554 // only return an error from here if we didn't get a valid
1555 // thread_oop.
1556 if (thread_oop == nullptr) {
1557 return err;
1558 }
1559 // We have a valid thread_oop.
1560 }
1561
1562 if (thread_oop->is_a(vmClasses::BaseVirtualThread_klass())) {
1563 // No support for virtual threads.
1564 return JVMTI_ERROR_UNSUPPORTED_OPERATION;
1565 }
1566 if (java_thread != nullptr) {
1567 // 'thread' refers to an existing JavaThread.
1568 return JVMTI_ERROR_INVALID_THREAD;
1569 }
1570
1571 if (priority < JVMTI_THREAD_MIN_PRIORITY || priority > JVMTI_THREAD_MAX_PRIORITY) {
1572 return JVMTI_ERROR_INVALID_PRIORITY;
1573 }
1574
1575 Handle thread_hndl(current_thread, thread_oop);
1576
1577 JvmtiAgentThread* new_thread = new JvmtiAgentThread(this, proc, arg);
1578
1579 // At this point it may be possible that no osthread was created for the
1580 // JavaThread due to lack of resources.
1581 if (new_thread->osthread() == nullptr) {
1582 // The new thread is not known to Thread-SMR yet so we can just delete.
1583 delete new_thread;
1584 return JVMTI_ERROR_OUT_OF_MEMORY;
1585 }
1586
1587 JavaThread::start_internal_daemon(current_thread, new_thread, thread_hndl,
1588 (ThreadPriority)priority);
1589
1590 return JVMTI_ERROR_NONE;
1591 } /* end RunAgentThread */
1592
1593 //
1594 // Thread Group functions
1595 //
1596
1597 // group_count_ptr - pre-checked for null
1598 // groups_ptr - pre-checked for null
1599 jvmtiError
1600 JvmtiEnv::GetTopThreadGroups(jint* group_count_ptr, jthreadGroup** groups_ptr) {
1601 JavaThread* current_thread = JavaThread::current();
1602
1603 // Only one top level thread group now.
1604 *group_count_ptr = 1;
1605
1606 // Allocate memory to store global-refs to the thread groups.
1607 // Assume this area is freed by caller.
1608 *groups_ptr = (jthreadGroup *) jvmtiMalloc((sizeof(jthreadGroup)) * (*group_count_ptr));
1609
1610 NULL_CHECK(*groups_ptr, JVMTI_ERROR_OUT_OF_MEMORY);
1611
1612 // Convert oop to Handle, then convert Handle to global-ref.
1613 {
1614 HandleMark hm(current_thread);
1615 Handle system_thread_group(current_thread, Universe::system_thread_group());
1616 *groups_ptr[0] = jni_reference(system_thread_group);
1617 }
1618
1619 return JVMTI_ERROR_NONE;
1620 } /* end GetTopThreadGroups */
1621
1622
1623 // info_ptr - pre-checked for null
1624 jvmtiError
1625 JvmtiEnv::GetThreadGroupInfo(jthreadGroup group, jvmtiThreadGroupInfo* info_ptr) {
1626 Thread* current_thread = Thread::current();
1627 ResourceMark rm(current_thread);
1628 HandleMark hm(current_thread);
1629
1630 Handle group_obj (current_thread, JNIHandles::resolve_external_guard(group));
1631 NULL_CHECK(group_obj(), JVMTI_ERROR_INVALID_THREAD_GROUP);
1632
1633 const char* name;
1634 Handle parent_group;
1635 bool is_daemon;
1636 ThreadPriority max_priority;
1637
1638 name = java_lang_ThreadGroup::name(group_obj());
1639 parent_group = Handle(current_thread, java_lang_ThreadGroup::parent(group_obj()));
1640 is_daemon = java_lang_ThreadGroup::is_daemon(group_obj());
1641 max_priority = java_lang_ThreadGroup::maxPriority(group_obj());
1642
1643 info_ptr->is_daemon = is_daemon;
1644 info_ptr->max_priority = max_priority;
1645 info_ptr->parent = jni_reference(parent_group);
1646
1647 if (name != nullptr) {
1648 info_ptr->name = (char*)jvmtiMalloc(strlen(name)+1);
1649 NULL_CHECK(info_ptr->name, JVMTI_ERROR_OUT_OF_MEMORY);
1650 strcpy(info_ptr->name, name);
1651 } else {
1652 info_ptr->name = nullptr;
1653 }
1654
1655 return JVMTI_ERROR_NONE;
1656 } /* end GetThreadGroupInfo */
1657
1658 // thread_count_ptr - pre-checked for null
1659 // threads_ptr - pre-checked for null
1660 // group_count_ptr - pre-checked for null
1661 // groups_ptr - pre-checked for null
1662 jvmtiError
1663 JvmtiEnv::GetThreadGroupChildren(jthreadGroup group, jint* thread_count_ptr, jthread** threads_ptr, jint* group_count_ptr, jthreadGroup** groups_ptr) {
1664 jvmtiError err;
1665 JavaThread* current_thread = JavaThread::current();
1666 oop group_obj = JNIHandles::resolve_external_guard(group);
1667 NULL_CHECK(group_obj, JVMTI_ERROR_INVALID_THREAD_GROUP);
1668
1669 Handle *thread_objs = nullptr;
1670 objArrayHandle group_objs;
1671 jint nthreads = 0;
1672 jint ngroups = 0;
1673 int hidden_threads = 0;
1674
1675 ResourceMark rm(current_thread);
1676 HandleMark hm(current_thread);
1677
1678 Handle group_hdl(current_thread, group_obj);
1679
1680 err = get_live_threads(current_thread, group_hdl, &nthreads, &thread_objs);
1681 if (err != JVMTI_ERROR_NONE) {
1682 return err;
1683 }
1684 err = get_subgroups(current_thread, group_hdl, &ngroups, &group_objs);
1685 if (err != JVMTI_ERROR_NONE) {
1686 return err;
1687 }
1688
1689 *group_count_ptr = ngroups;
1690 *thread_count_ptr = nthreads;
1691 *threads_ptr = new_jthreadArray(nthreads, thread_objs);
1692 *groups_ptr = new_jthreadGroupArray(ngroups, group_objs);
1693 if (nthreads > 0 && *threads_ptr == nullptr) {
1694 return JVMTI_ERROR_OUT_OF_MEMORY;
1695 }
1696 if (ngroups > 0 && *groups_ptr == nullptr) {
1697 return JVMTI_ERROR_OUT_OF_MEMORY;
1698 }
1699
1700 return JVMTI_ERROR_NONE;
1701 } /* end GetThreadGroupChildren */
1702
1703
1704 //
1705 // Stack Frame functions
1706 //
1707
1708 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
1709 // max_frame_count - pre-checked to be greater than or equal to 0
1710 // frame_buffer - pre-checked for null
1711 // count_ptr - pre-checked for null
1712 jvmtiError
1713 JvmtiEnv::GetStackTrace(jthread thread, jint start_depth, jint max_frame_count, jvmtiFrameInfo* frame_buffer, jint* count_ptr) {
1714 JavaThread* current_thread = JavaThread::current();
1715 HandleMark hm(current_thread);
1716
1717 JvmtiVTMSTransitionDisabler disabler(thread);
1718 ThreadsListHandle tlh(current_thread);
1719
1720 JavaThread* java_thread = nullptr;
1721 oop thread_obj = nullptr;
1722 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, &java_thread, &thread_obj);
1723 if (err != JVMTI_ERROR_NONE) {
1724 return err;
1725 }
1726
1727 if (java_lang_VirtualThread::is_instance(thread_obj)) {
1728 if (java_thread == nullptr) { // Target virtual thread is unmounted.
1729 ResourceMark rm(current_thread);
1730
1731 VM_VirtualThreadGetStackTrace op(this, Handle(current_thread, thread_obj),
1732 start_depth, max_frame_count,
1733 frame_buffer, count_ptr);
1734 VMThread::execute(&op);
1735 return op.result();
1736 }
1737 VirtualThreadGetStackTraceClosure op(this, Handle(current_thread, thread_obj),
1738 start_depth, max_frame_count, frame_buffer, count_ptr);
1739 Handshake::execute(&op, java_thread);
1740 return op.result();
1741 }
1742
1743 // It is only safe to perform the direct operation on the current
1744 // thread. All other usage needs to use a direct handshake for safety.
1745 if (java_thread == JavaThread::current()) {
1746 err = get_stack_trace(java_thread, start_depth, max_frame_count, frame_buffer, count_ptr);
1747 } else {
1748 // Get stack trace with handshake.
1749 GetStackTraceClosure op(this, start_depth, max_frame_count, frame_buffer, count_ptr);
1750 Handshake::execute(&op, java_thread);
1751 err = op.result();
1752 }
1753
1754 return err;
1755 } /* end GetStackTrace */
1756
1757
1758 // max_frame_count - pre-checked to be greater than or equal to 0
1759 // stack_info_ptr - pre-checked for null
1760 // thread_count_ptr - pre-checked for null
1761 jvmtiError
1762 JvmtiEnv::GetAllStackTraces(jint max_frame_count, jvmtiStackInfo** stack_info_ptr, jint* thread_count_ptr) {
1763 jvmtiError err = JVMTI_ERROR_NONE;
1764 JavaThread* calling_thread = JavaThread::current();
1765
1766 // JVMTI get stack traces at safepoint.
1767 VM_GetAllStackTraces op(this, calling_thread, max_frame_count);
1768 VMThread::execute(&op);
1769 *thread_count_ptr = op.final_thread_count();
1770 *stack_info_ptr = op.stack_info();
1771 err = op.result();
1772 return err;
1773 } /* end GetAllStackTraces */
1774
1775
1776 // thread_count - pre-checked to be greater than or equal to 0
1777 // thread_list - pre-checked for null
1778 // max_frame_count - pre-checked to be greater than or equal to 0
1779 // stack_info_ptr - pre-checked for null
1780 jvmtiError
1781 JvmtiEnv::GetThreadListStackTraces(jint thread_count, const jthread* thread_list, jint max_frame_count, jvmtiStackInfo** stack_info_ptr) {
1782 jvmtiError err = JVMTI_ERROR_NONE;
1783 JvmtiVTMSTransitionDisabler disabler;
1784
1785 if (thread_count == 1) {
1786
1787 // Use direct handshake if we need to get only one stack trace.
1788 JavaThread *current_thread = JavaThread::current();
1789 ThreadsListHandle tlh(current_thread);
1790
1791 jthread thread = thread_list[0];
1792 JavaThread *java_thread;
1793 oop thread_obj = nullptr;
1794 err = get_threadOop_and_JavaThread(tlh.list(), thread, &java_thread, &thread_obj);
1795 if (err != JVMTI_ERROR_NONE) {
1796 return err;
1797 }
1798
1799 if (java_lang_VirtualThread::is_instance(thread_obj) && java_thread == nullptr) {
1800 // Target virtual thread is unmounted.
1801 ResourceMark rm(current_thread);
1802 MultipleStackTracesCollector collector(this, max_frame_count);
1803 collector.fill_frames(thread, java_thread, thread_obj);
1804 collector.allocate_and_fill_stacks(/* thread_count */ 1);
1805 *stack_info_ptr = collector.stack_info();
1806 return collector.result();
1807 }
1808
1809 GetSingleStackTraceClosure op(this, current_thread, thread, max_frame_count);
1810 Handshake::execute(&op, &tlh, java_thread);
1811 err = op.result();
1812 if (err == JVMTI_ERROR_NONE) {
1813 *stack_info_ptr = op.stack_info();
1814 }
1815 } else {
1816 // JVMTI get stack traces at safepoint.
1817 VM_GetThreadListStackTraces op(this, thread_count, thread_list, max_frame_count);
1818 VMThread::execute(&op);
1819 err = op.result();
1820 if (err == JVMTI_ERROR_NONE) {
1821 *stack_info_ptr = op.stack_info();
1822 }
1823 }
1824 return err;
1825 } /* end GetThreadListStackTraces */
1826
1827
1828 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
1829 // count_ptr - pre-checked for null
1830 jvmtiError
1831 JvmtiEnv::GetFrameCount(jthread thread, jint* count_ptr) {
1832 JavaThread* current_thread = JavaThread::current();
1833 HandleMark hm(current_thread);
1834
1835 JvmtiVTMSTransitionDisabler disabler(thread);
1836 ThreadsListHandle tlh(current_thread);
1837
1838 JavaThread* java_thread = nullptr;
1839 oop thread_obj = nullptr;
1840 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, &java_thread, &thread_obj);
1841 if (err != JVMTI_ERROR_NONE) {
1842 return err;
1843 }
1844
1845 if (java_lang_VirtualThread::is_instance(thread_obj)) {
1846 if (java_thread == nullptr) { // Target virtual thread is unmounted.
1847 VM_VirtualThreadGetFrameCount op(this, Handle(current_thread, thread_obj), count_ptr);
1848 VMThread::execute(&op);
1849 return op.result();
1850 }
1851 VirtualThreadGetFrameCountClosure op(this, Handle(current_thread, thread_obj), count_ptr);
1852 Handshake::execute(&op, java_thread);
1853 return op.result();
1854 }
1855
1856 // It is only safe to perform the direct operation on the current
1857 // thread. All other usage needs to use a direct handshake for safety.
1858 if (java_thread == JavaThread::current()) {
1859 err = get_frame_count(java_thread, count_ptr);
1860 } else {
1861 // get java stack frame count with handshake.
1862 GetFrameCountClosure op(this, count_ptr);
1863 Handshake::execute(&op, java_thread);
1864 err = op.result();
1865 }
1866 return err;
1867 } /* end GetFrameCount */
1868
1869
1870 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
1871 jvmtiError
1872 JvmtiEnv::PopFrame(jthread thread) {
1873 JavaThread* current_thread = JavaThread::current();
1874 HandleMark hm(current_thread);
1875
1876 if (thread == nullptr) {
1877 return JVMTI_ERROR_INVALID_THREAD;
1878 }
1879 JvmtiVTMSTransitionDisabler disabler(thread);
1880 ThreadsListHandle tlh(current_thread);
1881
1882 JavaThread* java_thread = nullptr;
1883 oop thread_obj = nullptr;
1884 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, &java_thread, &thread_obj);
1885
1886 if (err != JVMTI_ERROR_NONE) {
1887 return err;
1888 }
1889 bool self = java_thread == current_thread;
1890
1891 err = check_non_suspended_or_opaque_frame(java_thread, thread_obj, self);
1892 if (err != JVMTI_ERROR_NONE) {
1893 return err;
1894 }
1895
1896 // retrieve or create the state
1897 JvmtiThreadState* state = JvmtiThreadState::state_for(java_thread);
1898 if (state == nullptr) {
1899 return JVMTI_ERROR_THREAD_NOT_ALIVE;
1900 }
1901
1902 // Eagerly reallocate scalar replaced objects.
1903 EscapeBarrier eb(true, current_thread, java_thread);
1904 if (!eb.deoptimize_objects(1)) {
1905 // Reallocation of scalar replaced objects failed -> return with error
1906 return JVMTI_ERROR_OUT_OF_MEMORY;
1907 }
1908
1909 MutexLocker mu(JvmtiThreadState_lock);
1910 UpdateForPopTopFrameClosure op(state);
1911 if (self) {
1912 op.doit(java_thread, self);
1913 } else {
1914 Handshake::execute(&op, java_thread);
1915 }
1916 return op.result();
1917 } /* end PopFrame */
1918
1919
1920 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
1921 // depth - pre-checked as non-negative
1922 // method_ptr - pre-checked for null
1923 // location_ptr - pre-checked for null
1924 jvmtiError
1925 JvmtiEnv::GetFrameLocation(jthread thread, jint depth, jmethodID* method_ptr, jlocation* location_ptr) {
1926 JavaThread* current_thread = JavaThread::current();
1927 HandleMark hm(current_thread);
1928
1929 JvmtiVTMSTransitionDisabler disabler(thread);
1930 ThreadsListHandle tlh(current_thread);
1931
1932 JavaThread* java_thread = nullptr;
1933 oop thread_obj = nullptr;
1934 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, &java_thread, &thread_obj);
1935 if (err != JVMTI_ERROR_NONE) {
1936 return err;
1937 }
1938
1939 if (java_lang_VirtualThread::is_instance(thread_obj)) {
1940 if (java_thread == nullptr) { // Target virtual thread is unmounted.
1941 err = get_frame_location(thread_obj, depth, method_ptr, location_ptr);
1942 return err;
1943 }
1944 VirtualThreadGetFrameLocationClosure op(this, Handle(current_thread, thread_obj),
1945 depth, method_ptr, location_ptr);
1946 Handshake::execute(&op, java_thread);
1947 return op.result();
1948 }
1949
1950 // It is only safe to perform the direct operation on the current
1951 // thread. All other usage needs to use a direct handshake for safety.
1952 if (java_thread == JavaThread::current()) {
1953 err = get_frame_location(java_thread, depth, method_ptr, location_ptr);
1954 } else {
1955 // JVMTI get java stack frame location via direct handshake.
1956 GetFrameLocationClosure op(this, depth, method_ptr, location_ptr);
1957 Handshake::execute(&op, java_thread);
1958 err = op.result();
1959 }
1960 return err;
1961 } /* end GetFrameLocation */
1962
1963
1964 // Threads_lock NOT held, java_thread not protected by lock
1965 // depth - pre-checked as non-negative
1966 jvmtiError
1967 JvmtiEnv::NotifyFramePop(jthread thread, jint depth) {
1968 ResourceMark rm;
1969 JvmtiVTMSTransitionDisabler disabler(thread);
1970 ThreadsListHandle tlh;
1971
1972 JavaThread* java_thread = nullptr;
1973 oop thread_obj = nullptr;
1974 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, &java_thread, &thread_obj);
1975 if (err != JVMTI_ERROR_NONE) {
1976 return err;
1977 }
1978
1979 JavaThread* current = JavaThread::current();
1980 HandleMark hm(current);
1981 Handle thread_handle(current, thread_obj);
1982 JvmtiThreadState *state = JvmtiThreadState::state_for(java_thread, thread_handle);
1983 if (state == nullptr) {
1984 return JVMTI_ERROR_THREAD_NOT_ALIVE;
1985 }
1986
1987 if (java_lang_VirtualThread::is_instance(thread_handle())) {
1988 VirtualThreadSetFramePopClosure op(this, thread_handle, state, depth);
1989 MutexLocker mu(current, JvmtiThreadState_lock);
1990 if (java_thread == nullptr || java_thread == current) {
1991 // Target virtual thread is unmounted or current.
1992 op.doit(java_thread, true /* self */);
1993 } else {
1994 Handshake::execute(&op, java_thread);
1995 }
1996 return op.result();
1997 }
1998
1999 SetFramePopClosure op(this, state, depth);
2000 MutexLocker mu(current, JvmtiThreadState_lock);
2001 if (java_thread == current) {
2002 op.doit(java_thread, true /* self */);
2003 } else {
2004 Handshake::execute(&op, java_thread);
2005 }
2006 return op.result();
2007 } /* end NotifyFramePop */
2008
2009
2010 //
2011 // Force Early Return functions
2012 //
2013
2014 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
2015 jvmtiError
2016 JvmtiEnv::ForceEarlyReturnObject(jthread thread, jobject value) {
2017 jvalue val;
2018 val.l = value;
2019 return force_early_return(thread, val, atos);
2020 } /* end ForceEarlyReturnObject */
2021
2022
2023 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
2024 jvmtiError
2025 JvmtiEnv::ForceEarlyReturnInt(jthread thread, jint value) {
2026 jvalue val;
2027 val.i = value;
2028 return force_early_return(thread, val, itos);
2029 } /* end ForceEarlyReturnInt */
2030
2031
2032 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
2033 jvmtiError
2034 JvmtiEnv::ForceEarlyReturnLong(jthread thread, jlong value) {
2035 jvalue val;
2036 val.j = value;
2037 return force_early_return(thread, val, ltos);
2038 } /* end ForceEarlyReturnLong */
2039
2040
2041 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
2042 jvmtiError
2043 JvmtiEnv::ForceEarlyReturnFloat(jthread thread, jfloat value) {
2044 jvalue val;
2045 val.f = value;
2046 return force_early_return(thread, val, ftos);
2047 } /* end ForceEarlyReturnFloat */
2048
2049
2050 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
2051 jvmtiError
2052 JvmtiEnv::ForceEarlyReturnDouble(jthread thread, jdouble value) {
2053 jvalue val;
2054 val.d = value;
2055 return force_early_return(thread, val, dtos);
2056 } /* end ForceEarlyReturnDouble */
2057
2058
2059 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
2060 jvmtiError
2061 JvmtiEnv::ForceEarlyReturnVoid(jthread thread) {
2062 jvalue val;
2063 val.j = 0L;
2064 return force_early_return(thread, val, vtos);
2065 } /* end ForceEarlyReturnVoid */
2066
2067
2068 //
2069 // Heap functions
2070 //
2071
2072 // klass - null is a valid value, must be checked
2073 // initial_object - null is a valid value, must be checked
2074 // callbacks - pre-checked for null
2075 // user_data - null is a valid value, must be checked
2076 jvmtiError
2077 JvmtiEnv::FollowReferences(jint heap_filter, jclass klass, jobject initial_object, const jvmtiHeapCallbacks* callbacks, const void* user_data) {
2078 // check klass if provided
2079 Klass* k = nullptr;
2080 if (klass != nullptr) {
2081 oop k_mirror = JNIHandles::resolve_external_guard(klass);
2082 if (k_mirror == nullptr) {
2083 return JVMTI_ERROR_INVALID_CLASS;
2084 }
2085 if (java_lang_Class::is_primitive(k_mirror)) {
2086 return JVMTI_ERROR_NONE;
2087 }
2088 k = java_lang_Class::as_Klass(k_mirror);
2089 if (klass == nullptr) {
2090 return JVMTI_ERROR_INVALID_CLASS;
2091 }
2092 }
2093
2094 if (initial_object != nullptr) {
2095 oop init_obj = JNIHandles::resolve_external_guard(initial_object);
2096 if (init_obj == nullptr) {
2097 return JVMTI_ERROR_INVALID_OBJECT;
2098 }
2099 }
2100
2101 Thread *thread = Thread::current();
2102 HandleMark hm(thread);
2103
2104 TraceTime t("FollowReferences", TRACETIME_LOG(Debug, jvmti, objecttagging));
2105 JvmtiTagMap::tag_map_for(this)->follow_references(heap_filter, k, initial_object, callbacks, user_data);
2106 return JVMTI_ERROR_NONE;
2107 } /* end FollowReferences */
2108
2109
2110 // klass - null is a valid value, must be checked
2111 // callbacks - pre-checked for null
2112 // user_data - null is a valid value, must be checked
2113 jvmtiError
2114 JvmtiEnv::IterateThroughHeap(jint heap_filter, jclass klass, const jvmtiHeapCallbacks* callbacks, const void* user_data) {
2115 // check klass if provided
2116 Klass* k = nullptr;
2117 if (klass != nullptr) {
2118 oop k_mirror = JNIHandles::resolve_external_guard(klass);
2119 if (k_mirror == nullptr) {
2120 return JVMTI_ERROR_INVALID_CLASS;
2121 }
2122 if (java_lang_Class::is_primitive(k_mirror)) {
2123 return JVMTI_ERROR_NONE;
2124 }
2125 k = java_lang_Class::as_Klass(k_mirror);
2126 if (k == nullptr) {
2127 return JVMTI_ERROR_INVALID_CLASS;
2128 }
2129 }
2130
2131 TraceTime t("IterateThroughHeap", TRACETIME_LOG(Debug, jvmti, objecttagging));
2132 JvmtiTagMap::tag_map_for(this)->iterate_through_heap(heap_filter, k, callbacks, user_data);
2133 return JVMTI_ERROR_NONE;
2134 } /* end IterateThroughHeap */
2135
2136
2137 // tag_ptr - pre-checked for null
2138 jvmtiError
2139 JvmtiEnv::GetTag(jobject object, jlong* tag_ptr) {
2140 oop o = JNIHandles::resolve_external_guard(object);
2141 NULL_CHECK(o, JVMTI_ERROR_INVALID_OBJECT);
2142 *tag_ptr = JvmtiTagMap::tag_map_for(this)->get_tag(object);
2143 return JVMTI_ERROR_NONE;
2144 } /* end GetTag */
2145
2146
2147 jvmtiError
2148 JvmtiEnv::SetTag(jobject object, jlong tag) {
2149 oop o = JNIHandles::resolve_external_guard(object);
2150 NULL_CHECK(o, JVMTI_ERROR_INVALID_OBJECT);
2151 JvmtiTagMap::tag_map_for(this)->set_tag(object, tag);
2152 return JVMTI_ERROR_NONE;
2153 } /* end SetTag */
2154
2155
2156 // tag_count - pre-checked to be greater than or equal to 0
2157 // tags - pre-checked for null
2158 // count_ptr - pre-checked for null
2159 // object_result_ptr - null is a valid value, must be checked
2160 // tag_result_ptr - null is a valid value, must be checked
2161 jvmtiError
2162 JvmtiEnv::GetObjectsWithTags(jint tag_count, const jlong* tags, jint* count_ptr, jobject** object_result_ptr, jlong** tag_result_ptr) {
2163 TraceTime t("GetObjectsWithTags", TRACETIME_LOG(Debug, jvmti, objecttagging));
2164 return JvmtiTagMap::tag_map_for(this)->get_objects_with_tags((jlong*)tags, tag_count, count_ptr, object_result_ptr, tag_result_ptr);
2165 } /* end GetObjectsWithTags */
2166
2167
2168 jvmtiError
2169 JvmtiEnv::ForceGarbageCollection() {
2170 Universe::heap()->collect(GCCause::_jvmti_force_gc);
2171 return JVMTI_ERROR_NONE;
2172 } /* end ForceGarbageCollection */
2173
2174
2175 //
2176 // Heap (1.0) functions
2177 //
2178
2179 // object_reference_callback - pre-checked for null
2180 // user_data - null is a valid value, must be checked
2181 jvmtiError
2182 JvmtiEnv::IterateOverObjectsReachableFromObject(jobject object, jvmtiObjectReferenceCallback object_reference_callback, const void* user_data) {
2183 oop o = JNIHandles::resolve_external_guard(object);
2184 NULL_CHECK(o, JVMTI_ERROR_INVALID_OBJECT);
2185 JvmtiTagMap::tag_map_for(this)->iterate_over_objects_reachable_from_object(object, object_reference_callback, user_data);
2186 return JVMTI_ERROR_NONE;
2187 } /* end IterateOverObjectsReachableFromObject */
2188
2189
2190 // heap_root_callback - null is a valid value, must be checked
2191 // stack_ref_callback - null is a valid value, must be checked
2192 // object_ref_callback - null is a valid value, must be checked
2193 // user_data - null is a valid value, must be checked
2194 jvmtiError
2195 JvmtiEnv::IterateOverReachableObjects(jvmtiHeapRootCallback heap_root_callback, jvmtiStackReferenceCallback stack_ref_callback, jvmtiObjectReferenceCallback object_ref_callback, const void* user_data) {
2196 TraceTime t("IterateOverReachableObjects", TRACETIME_LOG(Debug, jvmti, objecttagging));
2197 JvmtiTagMap::tag_map_for(this)->iterate_over_reachable_objects(heap_root_callback, stack_ref_callback, object_ref_callback, user_data);
2198 return JVMTI_ERROR_NONE;
2199 } /* end IterateOverReachableObjects */
2200
2201
2202 // heap_object_callback - pre-checked for null
2203 // user_data - null is a valid value, must be checked
2204 jvmtiError
2205 JvmtiEnv::IterateOverHeap(jvmtiHeapObjectFilter object_filter, jvmtiHeapObjectCallback heap_object_callback, const void* user_data) {
2206 TraceTime t("IterateOverHeap", TRACETIME_LOG(Debug, jvmti, objecttagging));
2207 Thread *thread = Thread::current();
2208 HandleMark hm(thread);
2209 JvmtiTagMap::tag_map_for(this)->iterate_over_heap(object_filter, nullptr, heap_object_callback, user_data);
2210 return JVMTI_ERROR_NONE;
2211 } /* end IterateOverHeap */
2212
2213
2214 // k_mirror - may be primitive, this must be checked
2215 // heap_object_callback - pre-checked for null
2216 // user_data - null is a valid value, must be checked
2217 jvmtiError
2218 JvmtiEnv::IterateOverInstancesOfClass(oop k_mirror, jvmtiHeapObjectFilter object_filter, jvmtiHeapObjectCallback heap_object_callback, const void* user_data) {
2219 if (java_lang_Class::is_primitive(k_mirror)) {
2220 // DO PRIMITIVE CLASS PROCESSING
2221 return JVMTI_ERROR_NONE;
2222 }
2223 Klass* klass = java_lang_Class::as_Klass(k_mirror);
2224 if (klass == nullptr) {
2225 return JVMTI_ERROR_INVALID_CLASS;
2226 }
2227 TraceTime t("IterateOverInstancesOfClass", TRACETIME_LOG(Debug, jvmti, objecttagging));
2228 JvmtiTagMap::tag_map_for(this)->iterate_over_heap(object_filter, klass, heap_object_callback, user_data);
2229 return JVMTI_ERROR_NONE;
2230 } /* end IterateOverInstancesOfClass */
2231
2232
2233 //
2234 // Local Variable functions
2235 //
2236
2237 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
2238 // depth - pre-checked as non-negative
2239 // value_ptr - pre-checked for null
2240 jvmtiError
2241 JvmtiEnv::GetLocalObject(jthread thread, jint depth, jint slot, jobject* value_ptr) {
2242 JavaThread* current_thread = JavaThread::current();
2243 // rm object is created to clean up the javaVFrame created in
2244 // doit_prologue(), but after doit() is finished with it.
2245 ResourceMark rm(current_thread);
2246 HandleMark hm(current_thread);
2247 JvmtiVTMSTransitionDisabler disabler(thread);
2248 ThreadsListHandle tlh(current_thread);
2249
2250 JavaThread* java_thread = nullptr;
2251 oop thread_obj = nullptr;
2252 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, &java_thread, &thread_obj);
2253 if (err != JVMTI_ERROR_NONE) {
2254 return err;
2255 }
2256 bool self = is_JavaThread_current(java_thread, thread_obj);
2257
2258 if (java_lang_VirtualThread::is_instance(thread_obj)) {
2259 VM_VirtualThreadGetOrSetLocal op(this, Handle(current_thread, thread_obj),
2260 current_thread, depth, slot, self);
2261 VMThread::execute(&op);
2262 err = op.result();
2263 if (err == JVMTI_ERROR_NONE) {
2264 *value_ptr = op.value().l;
2265 }
2266 } else {
2267 // Support for ordinary threads
2268 VM_GetOrSetLocal op(java_thread, current_thread, depth, slot, self);
2269 VMThread::execute(&op);
2270 err = op.result();
2271 if (err == JVMTI_ERROR_NONE) {
2272 *value_ptr = op.value().l;
2273 }
2274 }
2275 return err;
2276 } /* end GetLocalObject */
2277
2278 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
2279 // depth - pre-checked as non-negative
2280 // value - pre-checked for null
2281 jvmtiError
2282 JvmtiEnv::GetLocalInstance(jthread thread, jint depth, jobject* value_ptr){
2283 JavaThread* current_thread = JavaThread::current();
2284 // rm object is created to clean up the javaVFrame created in
2285 // doit_prologue(), but after doit() is finished with it.
2286 ResourceMark rm(current_thread);
2287 HandleMark hm(current_thread);
2288 JvmtiVTMSTransitionDisabler disabler(thread);
2289 ThreadsListHandle tlh(current_thread);
2290
2291 JavaThread* java_thread = nullptr;
2292 oop thread_obj = nullptr;
2293 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, &java_thread, &thread_obj);
2294 if (err != JVMTI_ERROR_NONE) {
2295 return err;
2296 }
2297 bool self = is_JavaThread_current(java_thread, thread_obj);
2298
2299 if (java_lang_VirtualThread::is_instance(thread_obj)) {
2300 VM_VirtualThreadGetReceiver op(this, Handle(current_thread, thread_obj),
2301 current_thread, depth, self);
2302 VMThread::execute(&op);
2303 err = op.result();
2304 if (err == JVMTI_ERROR_NONE) {
2305 *value_ptr = op.value().l;
2306 }
2307 } else {
2308 // Support for ordinary threads
2309 VM_GetReceiver op(java_thread, current_thread, depth, self);
2310 VMThread::execute(&op);
2311 err = op.result();
2312 if (err == JVMTI_ERROR_NONE) {
2313 *value_ptr = op.value().l;
2314 }
2315 }
2316 return err;
2317 } /* end GetLocalInstance */
2318
2319
2320 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
2321 // depth - pre-checked as non-negative
2322 // value_ptr - pre-checked for null
2323 jvmtiError
2324 JvmtiEnv::GetLocalInt(jthread thread, jint depth, jint slot, jint* value_ptr) {
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, &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
2341 if (java_lang_VirtualThread::is_instance(thread_obj)) {
2342 VM_VirtualThreadGetOrSetLocal op(this, Handle(current_thread, thread_obj),
2343 depth, slot, T_INT, self);
2344 VMThread::execute(&op);
2345 err = op.result();
2346 if (err == JVMTI_ERROR_NONE) {
2347 *value_ptr = op.value().i;
2348 }
2349 } else {
2350 // Support for ordinary threads
2351 VM_GetOrSetLocal op(java_thread, depth, slot, T_INT, self);
2352 VMThread::execute(&op);
2353 err = op.result();
2354 if (err == JVMTI_ERROR_NONE) {
2355 *value_ptr = op.value().i;
2356 }
2357 }
2358 return err;
2359 } /* end GetLocalInt */
2360
2361
2362 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
2363 // depth - pre-checked as non-negative
2364 // value_ptr - pre-checked for null
2365 jvmtiError
2366 JvmtiEnv::GetLocalLong(jthread thread, jint depth, jint slot, jlong* value_ptr) {
2367 JavaThread* current_thread = JavaThread::current();
2368 // rm object is created to clean up the javaVFrame created in
2369 // doit_prologue(), but after doit() is finished with it.
2370 ResourceMark rm(current_thread);
2371 HandleMark hm(current_thread);
2372 JvmtiVTMSTransitionDisabler disabler(thread);
2373 ThreadsListHandle tlh(current_thread);
2374
2375 JavaThread* java_thread = nullptr;
2376 oop thread_obj = nullptr;
2377 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, &java_thread, &thread_obj);
2378 if (err != JVMTI_ERROR_NONE) {
2379 return err;
2380 }
2381 bool self = is_JavaThread_current(java_thread, thread_obj);
2382
2383 if (java_lang_VirtualThread::is_instance(thread_obj)) {
2384 VM_VirtualThreadGetOrSetLocal op(this, Handle(current_thread, thread_obj),
2385 depth, slot, T_LONG, self);
2386 VMThread::execute(&op);
2387 err = op.result();
2388 if (err == JVMTI_ERROR_NONE) {
2389 *value_ptr = op.value().j;
2390 }
2391 } else {
2392 // Support for ordinary threads
2393 VM_GetOrSetLocal op(java_thread, depth, slot, T_LONG, self);
2394 VMThread::execute(&op);
2395 err = op.result();
2396 if (err == JVMTI_ERROR_NONE) {
2397 *value_ptr = op.value().j;
2398 }
2399 }
2400 return err;
2401 } /* end GetLocalLong */
2402
2403
2404 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
2405 // depth - pre-checked as non-negative
2406 // value_ptr - pre-checked for null
2407 jvmtiError
2408 JvmtiEnv::GetLocalFloat(jthread thread, jint depth, jint slot, jfloat* value_ptr) {
2409 JavaThread* current_thread = JavaThread::current();
2410 // rm object is created to clean up the javaVFrame created in
2411 // doit_prologue(), but after doit() is finished with it.
2412 ResourceMark rm(current_thread);
2413 HandleMark hm(current_thread);
2414 JvmtiVTMSTransitionDisabler disabler(thread);
2415 ThreadsListHandle tlh(current_thread);
2416
2417 JavaThread* java_thread = nullptr;
2418 oop thread_obj = nullptr;
2419 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, &java_thread, &thread_obj);
2420 if (err != JVMTI_ERROR_NONE) {
2421 return err;
2422 }
2423 bool self = is_JavaThread_current(java_thread, thread_obj);
2424
2425 if (java_lang_VirtualThread::is_instance(thread_obj)) {
2426 VM_VirtualThreadGetOrSetLocal op(this, Handle(current_thread, thread_obj),
2427 depth, slot, T_FLOAT, self);
2428 VMThread::execute(&op);
2429 err = op.result();
2430 if (err == JVMTI_ERROR_NONE) {
2431 *value_ptr = op.value().f;
2432 }
2433 } else {
2434 // Support for ordinary threads
2435 VM_GetOrSetLocal op(java_thread, depth, slot, T_FLOAT, self);
2436 VMThread::execute(&op);
2437 err = op.result();
2438 if (err == JVMTI_ERROR_NONE) {
2439 *value_ptr = op.value().f;
2440 }
2441 }
2442 return err;
2443 } /* end GetLocalFloat */
2444
2445
2446 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
2447 // depth - pre-checked as non-negative
2448 // value_ptr - pre-checked for null
2449 jvmtiError
2450 JvmtiEnv::GetLocalDouble(jthread thread, jint depth, jint slot, jdouble* value_ptr) {
2451 JavaThread* current_thread = JavaThread::current();
2452 // rm object is created to clean up the javaVFrame created in
2453 // doit_prologue(), but after doit() is finished with it.
2454 ResourceMark rm(current_thread);
2455 HandleMark hm(current_thread);
2456 JvmtiVTMSTransitionDisabler disabler(thread);
2457 ThreadsListHandle tlh(current_thread);
2458
2459 JavaThread* java_thread = nullptr;
2460 oop thread_obj = nullptr;
2461 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, &java_thread, &thread_obj);
2462 if (err != JVMTI_ERROR_NONE) {
2463 return err;
2464 }
2465 bool self = is_JavaThread_current(java_thread, thread_obj);
2466
2467 if (java_lang_VirtualThread::is_instance(thread_obj)) {
2468 VM_VirtualThreadGetOrSetLocal op(this, Handle(current_thread, thread_obj),
2469 depth, slot, T_DOUBLE, self);
2470 VMThread::execute(&op);
2471 err = op.result();
2472 if (err == JVMTI_ERROR_NONE) {
2473 *value_ptr = op.value().d;
2474 }
2475 } else {
2476 // Support for ordinary threads
2477 VM_GetOrSetLocal op(java_thread, depth, slot, T_DOUBLE, self);
2478 VMThread::execute(&op);
2479 err = op.result();
2480 if (err == JVMTI_ERROR_NONE) {
2481 *value_ptr = op.value().d;
2482 }
2483 }
2484 return err;
2485 } /* end GetLocalDouble */
2486
2487
2488 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
2489 // depth - pre-checked as non-negative
2490 jvmtiError
2491 JvmtiEnv::SetLocalObject(jthread thread, jint depth, jint slot, jobject value) {
2492 JavaThread* current_thread = JavaThread::current();
2493 // rm object is created to clean up the javaVFrame created in
2494 // doit_prologue(), but after doit() is finished with it.
2495 ResourceMark rm(current_thread);
2496 HandleMark hm(current_thread);
2497 JvmtiVTMSTransitionDisabler disabler(thread);
2498 ThreadsListHandle tlh(current_thread);
2499
2500 JavaThread* java_thread = nullptr;
2501 oop thread_obj = nullptr;
2502 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, &java_thread, &thread_obj);
2503 if (err != JVMTI_ERROR_NONE) {
2504 return err;
2505 }
2506 bool self = is_JavaThread_current(java_thread, thread_obj);
2507 jvalue val;
2508 val.l = value;
2509
2510 if (java_lang_VirtualThread::is_instance(thread_obj)) {
2511 VM_VirtualThreadGetOrSetLocal op(this, Handle(current_thread, thread_obj),
2512 depth, slot, T_OBJECT, val, self);
2513 VMThread::execute(&op);
2514 err = op.result();
2515 } else {
2516 // Support for ordinary threads
2517 VM_GetOrSetLocal op(java_thread, depth, slot, T_OBJECT, val, self);
2518 VMThread::execute(&op);
2519 err = op.result();
2520 }
2521 return err;
2522 } /* end SetLocalObject */
2523
2524
2525 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
2526 // depth - pre-checked as non-negative
2527 jvmtiError
2528 JvmtiEnv::SetLocalInt(jthread thread, jint depth, jint slot, jint value) {
2529 JavaThread* current_thread = JavaThread::current();
2530 // rm object is created to clean up the javaVFrame created in
2531 // doit_prologue(), but after doit() is finished with it.
2532 ResourceMark rm(current_thread);
2533 HandleMark hm(current_thread);
2534 JvmtiVTMSTransitionDisabler disabler(thread);
2535 ThreadsListHandle tlh(current_thread);
2536
2537 JavaThread* java_thread = nullptr;
2538 oop thread_obj = nullptr;
2539 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, &java_thread, &thread_obj);
2540 if (err != JVMTI_ERROR_NONE) {
2541 return err;
2542 }
2543 bool self = is_JavaThread_current(java_thread, thread_obj);
2544 jvalue val;
2545 val.i = value;
2546
2547 if (java_lang_VirtualThread::is_instance(thread_obj)) {
2548 VM_VirtualThreadGetOrSetLocal op(this, Handle(current_thread, thread_obj),
2549 depth, slot, T_INT, val, self);
2550 VMThread::execute(&op);
2551 err = op.result();
2552 } else {
2553 // Support for ordinary threads
2554 VM_GetOrSetLocal op(java_thread, depth, slot, T_INT, val, self);
2555 VMThread::execute(&op);
2556 err = op.result();
2557 }
2558 return err;
2559 } /* end SetLocalInt */
2560
2561
2562 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
2563 // depth - pre-checked as non-negative
2564 jvmtiError
2565 JvmtiEnv::SetLocalLong(jthread thread, jint depth, jint slot, jlong value) {
2566 JavaThread* current_thread = JavaThread::current();
2567 // rm object is created to clean up the javaVFrame created in
2568 // doit_prologue(), but after doit() is finished with it.
2569 ResourceMark rm(current_thread);
2570 HandleMark hm(current_thread);
2571 JvmtiVTMSTransitionDisabler disabler(thread);
2572 ThreadsListHandle tlh(current_thread);
2573
2574 JavaThread* java_thread = nullptr;
2575 oop thread_obj = nullptr;
2576 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, &java_thread, &thread_obj);
2577 if (err != JVMTI_ERROR_NONE) {
2578 return err;
2579 }
2580 bool self = is_JavaThread_current(java_thread, thread_obj);
2581 jvalue val;
2582 val.j = value;
2583
2584 if (java_lang_VirtualThread::is_instance(thread_obj)) {
2585 VM_VirtualThreadGetOrSetLocal op(this, Handle(current_thread, thread_obj),
2586 depth, slot, T_LONG, val, self);
2587 VMThread::execute(&op);
2588 err = op.result();
2589 } else {
2590 // Support for ordinary threads
2591 VM_GetOrSetLocal op(java_thread, depth, slot, T_LONG, val, self);
2592 VMThread::execute(&op);
2593 err = op.result();
2594 }
2595 return err;
2596 } /* end SetLocalLong */
2597
2598
2599 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
2600 // depth - pre-checked as non-negative
2601 jvmtiError
2602 JvmtiEnv::SetLocalFloat(jthread thread, jint depth, jint slot, jfloat value) {
2603 JavaThread* current_thread = JavaThread::current();
2604 // rm object is created to clean up the javaVFrame created in
2605 // doit_prologue(), but after doit() is finished with it.
2606 ResourceMark rm(current_thread);
2607 HandleMark hm(current_thread);
2608 JvmtiVTMSTransitionDisabler disabler(thread);
2609 ThreadsListHandle tlh(current_thread);
2610
2611 JavaThread* java_thread = nullptr;
2612 oop thread_obj = nullptr;
2613 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, &java_thread, &thread_obj);
2614 if (err != JVMTI_ERROR_NONE) {
2615 return err;
2616 }
2617 bool self = is_JavaThread_current(java_thread, thread_obj);
2618 jvalue val;
2619 val.f = value;
2620
2621 if (java_lang_VirtualThread::is_instance(thread_obj)) {
2622 VM_VirtualThreadGetOrSetLocal op(this, Handle(current_thread, thread_obj),
2623 depth, slot, T_FLOAT, val, self);
2624 VMThread::execute(&op);
2625 err = op.result();
2626 } else {
2627 // Support for ordinary threads
2628 VM_GetOrSetLocal op(java_thread, depth, slot, T_FLOAT, val, self);
2629 VMThread::execute(&op);
2630 err = op.result();
2631 }
2632 return err;
2633 } /* end SetLocalFloat */
2634
2635
2636 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
2637 // depth - pre-checked as non-negative
2638 jvmtiError
2639 JvmtiEnv::SetLocalDouble(jthread thread, jint depth, jint slot, jdouble value) {
2640 JavaThread* current_thread = JavaThread::current();
2641 // rm object is created to clean up the javaVFrame created in
2642 // doit_prologue(), but after doit() is finished with it.
2643 ResourceMark rm(current_thread);
2644 HandleMark hm(current_thread);
2645 JvmtiVTMSTransitionDisabler disabler(thread);
2646 ThreadsListHandle tlh(current_thread);
2647
2648 JavaThread* java_thread = nullptr;
2649 oop thread_obj = nullptr;
2650 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, &java_thread, &thread_obj);
2651 if (err != JVMTI_ERROR_NONE) {
2652 return err;
2653 }
2654 bool self = is_JavaThread_current(java_thread, thread_obj);
2655 jvalue val;
2656 val.d = value;
2657
2658 if (java_lang_VirtualThread::is_instance(thread_obj)) {
2659 VM_VirtualThreadGetOrSetLocal op(this, Handle(current_thread, thread_obj),
2660 depth, slot, T_DOUBLE, val, self);
2661 VMThread::execute(&op);
2662 err = op.result();
2663 } else {
2664 // Support for ordinary threads
2665 VM_GetOrSetLocal op(java_thread, depth, slot, T_DOUBLE, val, self);
2666 VMThread::execute(&op);
2667 err = op.result();
2668 }
2669 return err;
2670 } /* end SetLocalDouble */
2671
2672
2673 //
2674 // Breakpoint functions
2675 //
2676
2677 // method - pre-checked for validity, but may be null meaning obsolete method
2678 jvmtiError
2679 JvmtiEnv::SetBreakpoint(Method* method, jlocation location) {
2680 NULL_CHECK(method, JVMTI_ERROR_INVALID_METHODID);
2681 if (location < 0) { // simple invalid location check first
2682 return JVMTI_ERROR_INVALID_LOCATION;
2683 }
2684 // verify that the breakpoint is not past the end of the method
2685 if (location >= (jlocation) method->code_size()) {
2686 return JVMTI_ERROR_INVALID_LOCATION;
2687 }
2688
2689 ResourceMark rm;
2690 JvmtiBreakpoint bp(method, location);
2691 JvmtiBreakpoints& jvmti_breakpoints = JvmtiCurrentBreakpoints::get_jvmti_breakpoints();
2692 if (jvmti_breakpoints.set(bp) == JVMTI_ERROR_DUPLICATE)
2693 return JVMTI_ERROR_DUPLICATE;
2694
2695 if (TraceJVMTICalls) {
2696 jvmti_breakpoints.print();
2697 }
2698
2699 return JVMTI_ERROR_NONE;
2700 } /* end SetBreakpoint */
2701
2702
2703 // method - pre-checked for validity, but may be null meaning obsolete method
2704 jvmtiError
2705 JvmtiEnv::ClearBreakpoint(Method* method, jlocation location) {
2706 NULL_CHECK(method, JVMTI_ERROR_INVALID_METHODID);
2707
2708 if (location < 0) { // simple invalid location check first
2709 return JVMTI_ERROR_INVALID_LOCATION;
2710 }
2711
2712 // verify that the breakpoint is not past the end of the method
2713 if (location >= (jlocation) method->code_size()) {
2714 return JVMTI_ERROR_INVALID_LOCATION;
2715 }
2716
2717 JvmtiBreakpoint bp(method, location);
2718
2719 JvmtiBreakpoints& jvmti_breakpoints = JvmtiCurrentBreakpoints::get_jvmti_breakpoints();
2720 if (jvmti_breakpoints.clear(bp) == JVMTI_ERROR_NOT_FOUND)
2721 return JVMTI_ERROR_NOT_FOUND;
2722
2723 if (TraceJVMTICalls) {
2724 jvmti_breakpoints.print();
2725 }
2726
2727 return JVMTI_ERROR_NONE;
2728 } /* end ClearBreakpoint */
2729
2730
2731 //
2732 // Watched Field functions
2733 //
2734
2735 jvmtiError
2736 JvmtiEnv::SetFieldAccessWatch(fieldDescriptor* fdesc_ptr) {
2737 // make sure we haven't set this watch before
2738 if (fdesc_ptr->is_field_access_watched()) return JVMTI_ERROR_DUPLICATE;
2739 fdesc_ptr->set_is_field_access_watched(true);
2740
2741 JvmtiEventController::change_field_watch(JVMTI_EVENT_FIELD_ACCESS, true);
2742
2743 return JVMTI_ERROR_NONE;
2744 } /* end SetFieldAccessWatch */
2745
2746
2747 jvmtiError
2748 JvmtiEnv::ClearFieldAccessWatch(fieldDescriptor* fdesc_ptr) {
2749 // make sure we have a watch to clear
2750 if (!fdesc_ptr->is_field_access_watched()) return JVMTI_ERROR_NOT_FOUND;
2751 fdesc_ptr->set_is_field_access_watched(false);
2752
2753 JvmtiEventController::change_field_watch(JVMTI_EVENT_FIELD_ACCESS, false);
2754
2755 return JVMTI_ERROR_NONE;
2756 } /* end ClearFieldAccessWatch */
2757
2758
2759 jvmtiError
2760 JvmtiEnv::SetFieldModificationWatch(fieldDescriptor* fdesc_ptr) {
2761 // make sure we haven't set this watch before
2762 if (fdesc_ptr->is_field_modification_watched()) return JVMTI_ERROR_DUPLICATE;
2763 fdesc_ptr->set_is_field_modification_watched(true);
2764
2765 JvmtiEventController::change_field_watch(JVMTI_EVENT_FIELD_MODIFICATION, true);
2766
2767 return JVMTI_ERROR_NONE;
2768 } /* end SetFieldModificationWatch */
2769
2770
2771 jvmtiError
2772 JvmtiEnv::ClearFieldModificationWatch(fieldDescriptor* fdesc_ptr) {
2773 // make sure we have a watch to clear
2774 if (!fdesc_ptr->is_field_modification_watched()) return JVMTI_ERROR_NOT_FOUND;
2775 fdesc_ptr->set_is_field_modification_watched(false);
2776
2777 JvmtiEventController::change_field_watch(JVMTI_EVENT_FIELD_MODIFICATION, false);
2778
2779 return JVMTI_ERROR_NONE;
2780 } /* end ClearFieldModificationWatch */
2781
2782 //
2783 // Class functions
2784 //
2785
2786
2787 // k_mirror - may be primitive, this must be checked
2788 // signature_ptr - null is a valid value, must be checked
2789 // generic_ptr - null is a valid value, must be checked
2790 jvmtiError
2791 JvmtiEnv::GetClassSignature(oop k_mirror, char** signature_ptr, char** generic_ptr) {
2792 ResourceMark rm;
2793 bool isPrimitive = java_lang_Class::is_primitive(k_mirror);
2794 Klass* k = nullptr;
2795 if (!isPrimitive) {
2796 k = java_lang_Class::as_Klass(k_mirror);
2797 NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS);
2798 }
2799 if (signature_ptr != nullptr) {
2800 char* result = nullptr;
2801 if (isPrimitive) {
2802 char tchar = type2char(java_lang_Class::primitive_type(k_mirror));
2803 result = (char*) jvmtiMalloc(2);
2804 result[0] = tchar;
2805 result[1] = '\0';
2806 } else {
2807 const char* class_sig = k->signature_name();
2808 result = (char *) jvmtiMalloc(strlen(class_sig)+1);
2809 strcpy(result, class_sig);
2810 }
2811 *signature_ptr = result;
2812 }
2813 if (generic_ptr != nullptr) {
2814 *generic_ptr = nullptr;
2815 if (!isPrimitive && k->is_instance_klass()) {
2816 Symbol* soo = InstanceKlass::cast(k)->generic_signature();
2817 if (soo != nullptr) {
2818 const char *gen_sig = soo->as_C_string();
2819 if (gen_sig != nullptr) {
2820 char* gen_result;
2821 jvmtiError err = allocate(strlen(gen_sig) + 1,
2822 (unsigned char **)&gen_result);
2823 if (err != JVMTI_ERROR_NONE) {
2824 return err;
2825 }
2826 strcpy(gen_result, gen_sig);
2827 *generic_ptr = gen_result;
2828 }
2829 }
2830 }
2831 }
2832 return JVMTI_ERROR_NONE;
2833 } /* end GetClassSignature */
2834
2835
2836 // k_mirror - may be primitive, this must be checked
2837 // status_ptr - pre-checked for null
2838 jvmtiError
2839 JvmtiEnv::GetClassStatus(oop k_mirror, jint* status_ptr) {
2840 jint result = 0;
2841 if (java_lang_Class::is_primitive(k_mirror)) {
2842 result |= JVMTI_CLASS_STATUS_PRIMITIVE;
2843 } else {
2844 Klass* k = java_lang_Class::as_Klass(k_mirror);
2845 NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS);
2846 result = k->jvmti_class_status();
2847 }
2848 *status_ptr = result;
2849
2850 return JVMTI_ERROR_NONE;
2851 } /* end GetClassStatus */
2852
2853
2854 // k_mirror - may be primitive, this must be checked
2855 // source_name_ptr - pre-checked for null
2856 jvmtiError
2857 JvmtiEnv::GetSourceFileName(oop k_mirror, char** source_name_ptr) {
2858 if (java_lang_Class::is_primitive(k_mirror)) {
2859 return JVMTI_ERROR_ABSENT_INFORMATION;
2860 }
2861 Klass* k_klass = java_lang_Class::as_Klass(k_mirror);
2862 NULL_CHECK(k_klass, JVMTI_ERROR_INVALID_CLASS);
2863
2864 if (!k_klass->is_instance_klass()) {
2865 return JVMTI_ERROR_ABSENT_INFORMATION;
2866 }
2867
2868 Symbol* sfnOop = InstanceKlass::cast(k_klass)->source_file_name();
2869 NULL_CHECK(sfnOop, JVMTI_ERROR_ABSENT_INFORMATION);
2870 {
2871 JavaThread* current_thread = JavaThread::current();
2872 ResourceMark rm(current_thread);
2873 const char* sfncp = (const char*) sfnOop->as_C_string();
2874 *source_name_ptr = (char *) jvmtiMalloc(strlen(sfncp)+1);
2875 strcpy(*source_name_ptr, sfncp);
2876 }
2877
2878 return JVMTI_ERROR_NONE;
2879 } /* end GetSourceFileName */
2880
2881
2882 // k_mirror - may be primitive, this must be checked
2883 // modifiers_ptr - pre-checked for null
2884 jvmtiError
2885 JvmtiEnv::GetClassModifiers(oop k_mirror, jint* modifiers_ptr) {
2886 JavaThread* current_thread = JavaThread::current();
2887 jint result = 0;
2888 if (!java_lang_Class::is_primitive(k_mirror)) {
2889 Klass* k = java_lang_Class::as_Klass(k_mirror);
2890 NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS);
2891 result = k->compute_modifier_flags();
2892
2893 // Reset the deleted ACC_SUPER bit (deleted in compute_modifier_flags()).
2894 // if (k->is_super()) {
2895 // result |= JVM_ACC_SUPER;
2896 // }
2897 } else {
2898 result = (JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC);
2899 }
2900 *modifiers_ptr = result;
2901
2902 return JVMTI_ERROR_NONE;
2903 } /* end GetClassModifiers */
2904
2905
2906 // k_mirror - may be primitive, this must be checked
2907 // method_count_ptr - pre-checked for null
2908 // methods_ptr - pre-checked for null
2909 jvmtiError
2910 JvmtiEnv::GetClassMethods(oop k_mirror, jint* method_count_ptr, jmethodID** methods_ptr) {
2911 JavaThread* current_thread = JavaThread::current();
2912 HandleMark hm(current_thread);
2913
2914 if (java_lang_Class::is_primitive(k_mirror)) {
2915 *method_count_ptr = 0;
2916 *methods_ptr = (jmethodID*) jvmtiMalloc(0 * sizeof(jmethodID));
2917 return JVMTI_ERROR_NONE;
2918 }
2919 Klass* k = java_lang_Class::as_Klass(k_mirror);
2920 NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS);
2921
2922 // Return CLASS_NOT_PREPARED error as per JVMTI spec.
2923 if (!(k->jvmti_class_status() & (JVMTI_CLASS_STATUS_PREPARED|JVMTI_CLASS_STATUS_ARRAY) )) {
2924 return JVMTI_ERROR_CLASS_NOT_PREPARED;
2925 }
2926
2927 if (!k->is_instance_klass()) {
2928 *method_count_ptr = 0;
2929 *methods_ptr = (jmethodID*) jvmtiMalloc(0 * sizeof(jmethodID));
2930 return JVMTI_ERROR_NONE;
2931 }
2932 InstanceKlass* ik = InstanceKlass::cast(k);
2933 // Allocate the result and fill it in
2934 int result_length = ik->methods()->length();
2935 jmethodID* result_list = (jmethodID*)jvmtiMalloc(result_length * sizeof(jmethodID));
2936 int index;
2937 bool jmethodids_found = true;
2938 int skipped = 0; // skip overpass methods
2939
2940 for (index = 0; index < result_length; index++) {
2941 Method* m = ik->methods()->at(index);
2942 // Depending on can_maintain_original_method_order capability use the original
2943 // method ordering indices stored in the class, so we can emit jmethodIDs in
2944 // the order they appeared in the class file or just copy in current order.
2945 int result_index = JvmtiExport::can_maintain_original_method_order() ? ik->method_ordering()->at(index) : index;
2946 assert(result_index >= 0 && result_index < result_length, "invalid original method index");
2947 if (m->is_overpass()) {
2948 result_list[result_index] = nullptr;
2949 skipped++;
2950 continue;
2951 }
2952 jmethodID id;
2953 if (jmethodids_found) {
2954 id = m->find_jmethod_id_or_null();
2955 if (id == nullptr) {
2956 // If we find an uninitialized value, make sure there is
2957 // enough space for all the uninitialized values we might
2958 // find.
2959 ik->ensure_space_for_methodids(index);
2960 jmethodids_found = false;
2961 id = m->jmethod_id();
2962 }
2963 } else {
2964 id = m->jmethod_id();
2965 }
2966 result_list[result_index] = id;
2967 }
2968
2969 // Fill in return value.
2970 if (skipped > 0) {
2971 // copy results skipping null methodIDs
2972 *methods_ptr = (jmethodID*)jvmtiMalloc((result_length - skipped) * sizeof(jmethodID));
2973 *method_count_ptr = result_length - skipped;
2974 for (index = 0, skipped = 0; index < result_length; index++) {
2975 if (result_list[index] == nullptr) {
2976 skipped++;
2977 } else {
2978 (*methods_ptr)[index - skipped] = result_list[index];
2979 }
2980 }
2981 deallocate((unsigned char *)result_list);
2982 } else {
2983 *method_count_ptr = result_length;
2984 *methods_ptr = result_list;
2985 }
2986
2987 return JVMTI_ERROR_NONE;
2988 } /* end GetClassMethods */
2989
2990
2991 // k_mirror - may be primitive, this must be checked
2992 // field_count_ptr - pre-checked for null
2993 // fields_ptr - pre-checked for null
2994 jvmtiError
2995 JvmtiEnv::GetClassFields(oop k_mirror, jint* field_count_ptr, jfieldID** fields_ptr) {
2996 if (java_lang_Class::is_primitive(k_mirror)) {
2997 *field_count_ptr = 0;
2998 *fields_ptr = (jfieldID*) jvmtiMalloc(0 * sizeof(jfieldID));
2999 return JVMTI_ERROR_NONE;
3000 }
3001 JavaThread* current_thread = JavaThread::current();
3002 HandleMark hm(current_thread);
3003 Klass* k = java_lang_Class::as_Klass(k_mirror);
3004 NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS);
3005
3006 // Return CLASS_NOT_PREPARED error as per JVMTI spec.
3007 if (!(k->jvmti_class_status() & (JVMTI_CLASS_STATUS_PREPARED|JVMTI_CLASS_STATUS_ARRAY) )) {
3008 return JVMTI_ERROR_CLASS_NOT_PREPARED;
3009 }
3010
3011 if (!k->is_instance_klass()) {
3012 *field_count_ptr = 0;
3013 *fields_ptr = (jfieldID*) jvmtiMalloc(0 * sizeof(jfieldID));
3014 return JVMTI_ERROR_NONE;
3015 }
3016
3017
3018 InstanceKlass* ik = InstanceKlass::cast(k);
3019
3020 int result_count = 0;
3021 // First, count the fields.
3022 FilteredFieldStream flds(ik, true, true);
3023 result_count = flds.field_count();
3024
3025 // Allocate the result and fill it in
3026 jfieldID* result_list = (jfieldID*) jvmtiMalloc(result_count * sizeof(jfieldID));
3027 // The JVMTI spec requires fields in the order they occur in the class file,
3028 // this is the reverse order of what FieldStream hands out.
3029 int id_index = (result_count - 1);
3030
3031 for (FilteredFieldStream src_st(ik, true, true); !src_st.eos(); src_st.next()) {
3032 result_list[id_index--] = jfieldIDWorkaround::to_jfieldID(
3033 ik, src_st.offset(),
3034 src_st.access_flags().is_static(),
3035 src_st.field_descriptor().is_flat());
3036 }
3037 assert(id_index == -1, "just checking");
3038 // Fill in the results
3039 *field_count_ptr = result_count;
3040 *fields_ptr = result_list;
3041
3042 return JVMTI_ERROR_NONE;
3043 } /* end GetClassFields */
3044
3045
3046 // k_mirror - may be primitive, this must be checked
3047 // interface_count_ptr - pre-checked for null
3048 // interfaces_ptr - pre-checked for null
3049 jvmtiError
3050 JvmtiEnv::GetImplementedInterfaces(oop k_mirror, jint* interface_count_ptr, jclass** interfaces_ptr) {
3051 {
3052 if (java_lang_Class::is_primitive(k_mirror)) {
3053 *interface_count_ptr = 0;
3054 *interfaces_ptr = (jclass*) jvmtiMalloc(0 * sizeof(jclass));
3055 return JVMTI_ERROR_NONE;
3056 }
3057 JavaThread* current_thread = JavaThread::current();
3058 HandleMark hm(current_thread);
3059 Klass* k = java_lang_Class::as_Klass(k_mirror);
3060 NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS);
3061
3062 // Return CLASS_NOT_PREPARED error as per JVMTI spec.
3063 if (!(k->jvmti_class_status() & (JVMTI_CLASS_STATUS_PREPARED|JVMTI_CLASS_STATUS_ARRAY) ))
3064 return JVMTI_ERROR_CLASS_NOT_PREPARED;
3065
3066 if (!k->is_instance_klass()) {
3067 *interface_count_ptr = 0;
3068 *interfaces_ptr = (jclass*) jvmtiMalloc(0 * sizeof(jclass));
3069 return JVMTI_ERROR_NONE;
3070 }
3071
3072 InstanceKlass* ik = InstanceKlass::cast(k);
3073 Array<InstanceKlass*>* interface_list = ik->local_interfaces();
3074 int result_length = (interface_list == nullptr ? 0 : interface_list->length());
3075 jclass* result_list = (jclass*) jvmtiMalloc(result_length * sizeof(jclass));
3076 for (int i_index = 0; i_index < result_length; i_index += 1) {
3077 InstanceKlass* klass_at = interface_list->at(i_index);
3078 assert(klass_at->is_klass(), "interfaces must be Klass*s");
3079 assert(klass_at->is_interface(), "interfaces must be interfaces");
3080 oop mirror_at = klass_at->java_mirror();
3081 Handle handle_at = Handle(current_thread, mirror_at);
3082 result_list[i_index] = (jclass) jni_reference(handle_at);
3083 }
3084 *interface_count_ptr = result_length;
3085 *interfaces_ptr = result_list;
3086 }
3087
3088 return JVMTI_ERROR_NONE;
3089 } /* end GetImplementedInterfaces */
3090
3091
3092 // k_mirror - may be primitive, this must be checked
3093 // minor_version_ptr - pre-checked for null
3094 // major_version_ptr - pre-checked for null
3095 jvmtiError
3096 JvmtiEnv::GetClassVersionNumbers(oop k_mirror, jint* minor_version_ptr, jint* major_version_ptr) {
3097 if (java_lang_Class::is_primitive(k_mirror)) {
3098 return JVMTI_ERROR_ABSENT_INFORMATION;
3099 }
3100 Klass* klass = java_lang_Class::as_Klass(k_mirror);
3101
3102 jint status = klass->jvmti_class_status();
3103 if (status & (JVMTI_CLASS_STATUS_ERROR)) {
3104 return JVMTI_ERROR_INVALID_CLASS;
3105 }
3106 if (status & (JVMTI_CLASS_STATUS_ARRAY)) {
3107 return JVMTI_ERROR_ABSENT_INFORMATION;
3108 }
3109
3110 InstanceKlass* ik = InstanceKlass::cast(klass);
3111 *minor_version_ptr = ik->minor_version();
3112 *major_version_ptr = ik->major_version();
3113
3114 return JVMTI_ERROR_NONE;
3115 } /* end GetClassVersionNumbers */
3116
3117
3118 // k_mirror - may be primitive, this must be checked
3119 // constant_pool_count_ptr - pre-checked for null
3120 // constant_pool_byte_count_ptr - pre-checked for null
3121 // constant_pool_bytes_ptr - pre-checked for null
3122 jvmtiError
3123 JvmtiEnv::GetConstantPool(oop k_mirror, jint* constant_pool_count_ptr, jint* constant_pool_byte_count_ptr, unsigned char** constant_pool_bytes_ptr) {
3124 if (java_lang_Class::is_primitive(k_mirror)) {
3125 return JVMTI_ERROR_ABSENT_INFORMATION;
3126 }
3127
3128 Klass* klass = java_lang_Class::as_Klass(k_mirror);
3129 Thread *thread = Thread::current();
3130 ResourceMark rm(thread);
3131
3132 jint status = klass->jvmti_class_status();
3133 if (status & (JVMTI_CLASS_STATUS_ERROR)) {
3134 return JVMTI_ERROR_INVALID_CLASS;
3135 }
3136 if (status & (JVMTI_CLASS_STATUS_ARRAY)) {
3137 return JVMTI_ERROR_ABSENT_INFORMATION;
3138 }
3139
3140 InstanceKlass* ik = InstanceKlass::cast(klass);
3141 JvmtiConstantPoolReconstituter reconstituter(ik);
3142 if (reconstituter.get_error() != JVMTI_ERROR_NONE) {
3143 return reconstituter.get_error();
3144 }
3145
3146 unsigned char *cpool_bytes;
3147 int cpool_size = reconstituter.cpool_size();
3148 if (reconstituter.get_error() != JVMTI_ERROR_NONE) {
3149 return reconstituter.get_error();
3150 }
3151 jvmtiError res = allocate(cpool_size, &cpool_bytes);
3152 if (res != JVMTI_ERROR_NONE) {
3153 return res;
3154 }
3155 reconstituter.copy_cpool_bytes(cpool_bytes);
3156 if (reconstituter.get_error() != JVMTI_ERROR_NONE) {
3157 return reconstituter.get_error();
3158 }
3159
3160 constantPoolHandle constants(thread, ik->constants());
3161 *constant_pool_count_ptr = constants->length();
3162 *constant_pool_byte_count_ptr = cpool_size;
3163 *constant_pool_bytes_ptr = cpool_bytes;
3164
3165 return JVMTI_ERROR_NONE;
3166 } /* end GetConstantPool */
3167
3168
3169 // k_mirror - may be primitive, this must be checked
3170 // is_interface_ptr - pre-checked for null
3171 jvmtiError
3172 JvmtiEnv::IsInterface(oop k_mirror, jboolean* is_interface_ptr) {
3173 {
3174 bool result = false;
3175 if (!java_lang_Class::is_primitive(k_mirror)) {
3176 Klass* k = java_lang_Class::as_Klass(k_mirror);
3177 if (k != nullptr && k->is_interface()) {
3178 result = true;
3179 }
3180 }
3181 *is_interface_ptr = result;
3182 }
3183
3184 return JVMTI_ERROR_NONE;
3185 } /* end IsInterface */
3186
3187
3188 // k_mirror - may be primitive, this must be checked
3189 // is_array_class_ptr - pre-checked for null
3190 jvmtiError
3191 JvmtiEnv::IsArrayClass(oop k_mirror, jboolean* is_array_class_ptr) {
3192 {
3193 bool result = false;
3194 if (!java_lang_Class::is_primitive(k_mirror)) {
3195 Klass* k = java_lang_Class::as_Klass(k_mirror);
3196 if (k != nullptr && k->is_array_klass()) {
3197 result = true;
3198 }
3199 }
3200 *is_array_class_ptr = result;
3201 }
3202
3203 return JVMTI_ERROR_NONE;
3204 } /* end IsArrayClass */
3205
3206
3207 // k_mirror - may be primitive, this must be checked
3208 // classloader_ptr - pre-checked for null
3209 jvmtiError
3210 JvmtiEnv::GetClassLoader(oop k_mirror, jobject* classloader_ptr) {
3211 {
3212 if (java_lang_Class::is_primitive(k_mirror)) {
3213 *classloader_ptr = (jclass) jni_reference(Handle());
3214 return JVMTI_ERROR_NONE;
3215 }
3216 JavaThread* current_thread = JavaThread::current();
3217 HandleMark hm(current_thread);
3218 Klass* k = java_lang_Class::as_Klass(k_mirror);
3219 NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS);
3220
3221 oop result_oop = k->class_loader();
3222 if (result_oop == nullptr) {
3223 *classloader_ptr = (jclass) jni_reference(Handle());
3224 return JVMTI_ERROR_NONE;
3225 }
3226 Handle result_handle = Handle(current_thread, result_oop);
3227 jclass result_jnihandle = (jclass) jni_reference(result_handle);
3228 *classloader_ptr = result_jnihandle;
3229 }
3230 return JVMTI_ERROR_NONE;
3231 } /* end GetClassLoader */
3232
3233
3234 // k_mirror - may be primitive, this must be checked
3235 // source_debug_extension_ptr - pre-checked for null
3236 jvmtiError
3237 JvmtiEnv::GetSourceDebugExtension(oop k_mirror, char** source_debug_extension_ptr) {
3238 {
3239 if (java_lang_Class::is_primitive(k_mirror)) {
3240 return JVMTI_ERROR_ABSENT_INFORMATION;
3241 }
3242 Klass* k = java_lang_Class::as_Klass(k_mirror);
3243 NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS);
3244 if (!k->is_instance_klass()) {
3245 return JVMTI_ERROR_ABSENT_INFORMATION;
3246 }
3247 const char* sde = InstanceKlass::cast(k)->source_debug_extension();
3248 NULL_CHECK(sde, JVMTI_ERROR_ABSENT_INFORMATION);
3249
3250 {
3251 *source_debug_extension_ptr = (char *) jvmtiMalloc(strlen(sde)+1);
3252 strcpy(*source_debug_extension_ptr, sde);
3253 }
3254 }
3255
3256 return JVMTI_ERROR_NONE;
3257 } /* end GetSourceDebugExtension */
3258
3259 //
3260 // Object functions
3261 //
3262
3263 // hash_code_ptr - pre-checked for null
3264 jvmtiError
3265 JvmtiEnv::GetObjectHashCode(jobject object, jint* hash_code_ptr) {
3266 oop mirror = JNIHandles::resolve_external_guard(object);
3267 NULL_CHECK(mirror, JVMTI_ERROR_INVALID_OBJECT);
3268 NULL_CHECK(hash_code_ptr, JVMTI_ERROR_NULL_POINTER);
3269
3270 {
3271 jint result = (jint) mirror->identity_hash();
3272 *hash_code_ptr = result;
3273 }
3274 return JVMTI_ERROR_NONE;
3275 } /* end GetObjectHashCode */
3276
3277
3278 // info_ptr - pre-checked for null
3279 jvmtiError
3280 JvmtiEnv::GetObjectMonitorUsage(jobject object, jvmtiMonitorUsage* info_ptr) {
3281 // This needs to be performed at a safepoint to gather stable data
3282 // because monitor owner / waiters might not be suspended.
3283 VM_GetObjectMonitorUsage op(this, JavaThread::current(), object, info_ptr);
3284 VMThread::execute(&op);
3285 return op.result();
3286 } /* end GetObjectMonitorUsage */
3287
3288
3289 //
3290 // Field functions
3291 //
3292
3293 // name_ptr - null is a valid value, must be checked
3294 // signature_ptr - null is a valid value, must be checked
3295 // generic_ptr - null is a valid value, must be checked
3296 jvmtiError
3297 JvmtiEnv::GetFieldName(fieldDescriptor* fdesc_ptr, char** name_ptr, char** signature_ptr, char** generic_ptr) {
3298 JavaThread* current_thread = JavaThread::current();
3299 ResourceMark rm(current_thread);
3300 if (name_ptr == nullptr) {
3301 // just don't return the name
3302 } else {
3303 const char* fieldName = fdesc_ptr->name()->as_C_string();
3304 *name_ptr = (char*) jvmtiMalloc(strlen(fieldName) + 1);
3305 if (*name_ptr == nullptr)
3306 return JVMTI_ERROR_OUT_OF_MEMORY;
3307 strcpy(*name_ptr, fieldName);
3308 }
3309 if (signature_ptr== nullptr) {
3310 // just don't return the signature
3311 } else {
3312 const char* fieldSignature = fdesc_ptr->signature()->as_C_string();
3313 *signature_ptr = (char*) jvmtiMalloc(strlen(fieldSignature) + 1);
3314 if (*signature_ptr == nullptr)
3315 return JVMTI_ERROR_OUT_OF_MEMORY;
3316 strcpy(*signature_ptr, fieldSignature);
3317 }
3318 if (generic_ptr != nullptr) {
3319 *generic_ptr = nullptr;
3320 Symbol* soop = fdesc_ptr->generic_signature();
3321 if (soop != nullptr) {
3322 const char* gen_sig = soop->as_C_string();
3323 if (gen_sig != nullptr) {
3324 jvmtiError err = allocate(strlen(gen_sig) + 1, (unsigned char **)generic_ptr);
3325 if (err != JVMTI_ERROR_NONE) {
3326 return err;
3327 }
3328 strcpy(*generic_ptr, gen_sig);
3329 }
3330 }
3331 }
3332 return JVMTI_ERROR_NONE;
3333 } /* end GetFieldName */
3334
3335
3336 // declaring_class_ptr - pre-checked for null
3337 jvmtiError
3338 JvmtiEnv::GetFieldDeclaringClass(fieldDescriptor* fdesc_ptr, jclass* declaring_class_ptr) {
3339
3340 *declaring_class_ptr = get_jni_class_non_null(fdesc_ptr->field_holder());
3341 return JVMTI_ERROR_NONE;
3342 } /* end GetFieldDeclaringClass */
3343
3344
3345 // modifiers_ptr - pre-checked for null
3346 jvmtiError
3347 JvmtiEnv::GetFieldModifiers(fieldDescriptor* fdesc_ptr, jint* modifiers_ptr) {
3348
3349 AccessFlags resultFlags = fdesc_ptr->access_flags();
3350 jint result = resultFlags.as_int();
3351 *modifiers_ptr = result;
3352
3353 return JVMTI_ERROR_NONE;
3354 } /* end GetFieldModifiers */
3355
3356
3357 // is_synthetic_ptr - pre-checked for null
3358 jvmtiError
3359 JvmtiEnv::IsFieldSynthetic(fieldDescriptor* fdesc_ptr, jboolean* is_synthetic_ptr) {
3360 *is_synthetic_ptr = fdesc_ptr->is_synthetic();
3361 return JVMTI_ERROR_NONE;
3362 } /* end IsFieldSynthetic */
3363
3364
3365 //
3366 // Method functions
3367 //
3368
3369 // method - pre-checked for validity, but may be null meaning obsolete method
3370 // name_ptr - null is a valid value, must be checked
3371 // signature_ptr - null is a valid value, must be checked
3372 // generic_ptr - null is a valid value, must be checked
3373 jvmtiError
3374 JvmtiEnv::GetMethodName(Method* method, char** name_ptr, char** signature_ptr, char** generic_ptr) {
3375 NULL_CHECK(method, JVMTI_ERROR_INVALID_METHODID);
3376 JavaThread* current_thread = JavaThread::current();
3377
3378 ResourceMark rm(current_thread); // get the utf8 name and signature
3379 if (name_ptr == nullptr) {
3380 // just don't return the name
3381 } else {
3382 const char* utf8_name = (const char *) method->name()->as_utf8();
3383 *name_ptr = (char *) jvmtiMalloc(strlen(utf8_name)+1);
3384 strcpy(*name_ptr, utf8_name);
3385 }
3386 if (signature_ptr == nullptr) {
3387 // just don't return the signature
3388 } else {
3389 const char* utf8_signature = (const char *) method->signature()->as_utf8();
3390 *signature_ptr = (char *) jvmtiMalloc(strlen(utf8_signature) + 1);
3391 strcpy(*signature_ptr, utf8_signature);
3392 }
3393
3394 if (generic_ptr != nullptr) {
3395 *generic_ptr = nullptr;
3396 Symbol* soop = method->generic_signature();
3397 if (soop != nullptr) {
3398 const char* gen_sig = soop->as_C_string();
3399 if (gen_sig != nullptr) {
3400 jvmtiError err = allocate(strlen(gen_sig) + 1, (unsigned char **)generic_ptr);
3401 if (err != JVMTI_ERROR_NONE) {
3402 return err;
3403 }
3404 strcpy(*generic_ptr, gen_sig);
3405 }
3406 }
3407 }
3408 return JVMTI_ERROR_NONE;
3409 } /* end GetMethodName */
3410
3411
3412 // method - pre-checked for validity, but may be null meaning obsolete method
3413 // declaring_class_ptr - pre-checked for null
3414 jvmtiError
3415 JvmtiEnv::GetMethodDeclaringClass(Method* method, jclass* declaring_class_ptr) {
3416 NULL_CHECK(method, JVMTI_ERROR_INVALID_METHODID);
3417 (*declaring_class_ptr) = get_jni_class_non_null(method->method_holder());
3418 return JVMTI_ERROR_NONE;
3419 } /* end GetMethodDeclaringClass */
3420
3421
3422 // method - pre-checked for validity, but may be null meaning obsolete method
3423 // modifiers_ptr - pre-checked for null
3424 jvmtiError
3425 JvmtiEnv::GetMethodModifiers(Method* method, jint* modifiers_ptr) {
3426 NULL_CHECK(method, JVMTI_ERROR_INVALID_METHODID);
3427 (*modifiers_ptr) = method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
3428 return JVMTI_ERROR_NONE;
3429 } /* end GetMethodModifiers */
3430
3431
3432 // method - pre-checked for validity, but may be null meaning obsolete method
3433 // max_ptr - pre-checked for null
3434 jvmtiError
3435 JvmtiEnv::GetMaxLocals(Method* method, jint* max_ptr) {
3436 NULL_CHECK(method, JVMTI_ERROR_INVALID_METHODID);
3437 // get max stack
3438 (*max_ptr) = method->max_locals();
3439 return JVMTI_ERROR_NONE;
3440 } /* end GetMaxLocals */
3441
3442
3443 // method - pre-checked for validity, but may be null meaning obsolete method
3444 // size_ptr - pre-checked for null
3445 jvmtiError
3446 JvmtiEnv::GetArgumentsSize(Method* method, jint* size_ptr) {
3447 NULL_CHECK(method, JVMTI_ERROR_INVALID_METHODID);
3448 // get size of arguments
3449
3450 (*size_ptr) = method->size_of_parameters();
3451 return JVMTI_ERROR_NONE;
3452 } /* end GetArgumentsSize */
3453
3454
3455 // method - pre-checked for validity, but may be null meaning obsolete method
3456 // entry_count_ptr - pre-checked for null
3457 // table_ptr - pre-checked for null
3458 jvmtiError
3459 JvmtiEnv::GetLineNumberTable(Method* method, jint* entry_count_ptr, jvmtiLineNumberEntry** table_ptr) {
3460 NULL_CHECK(method, JVMTI_ERROR_INVALID_METHODID);
3461 if (!method->has_linenumber_table()) {
3462 return (JVMTI_ERROR_ABSENT_INFORMATION);
3463 }
3464
3465 // The line number table is compressed so we don't know how big it is until decompressed.
3466 // Decompression is really fast so we just do it twice.
3467
3468 // Compute size of table
3469 jint num_entries = 0;
3470 CompressedLineNumberReadStream stream(method->compressed_linenumber_table());
3471 while (stream.read_pair()) {
3472 num_entries++;
3473 }
3474 jvmtiLineNumberEntry *jvmti_table =
3475 (jvmtiLineNumberEntry *)jvmtiMalloc(num_entries * (sizeof(jvmtiLineNumberEntry)));
3476
3477 // Fill jvmti table
3478 if (num_entries > 0) {
3479 int index = 0;
3480 CompressedLineNumberReadStream stream(method->compressed_linenumber_table());
3481 while (stream.read_pair()) {
3482 jvmti_table[index].start_location = (jlocation) stream.bci();
3483 jvmti_table[index].line_number = (jint) stream.line();
3484 index++;
3485 }
3486 assert(index == num_entries, "sanity check");
3487 }
3488
3489 // Set up results
3490 (*entry_count_ptr) = num_entries;
3491 (*table_ptr) = jvmti_table;
3492
3493 return JVMTI_ERROR_NONE;
3494 } /* end GetLineNumberTable */
3495
3496
3497 // method - pre-checked for validity, but may be null meaning obsolete method
3498 // start_location_ptr - pre-checked for null
3499 // end_location_ptr - pre-checked for null
3500 jvmtiError
3501 JvmtiEnv::GetMethodLocation(Method* method, jlocation* start_location_ptr, jlocation* end_location_ptr) {
3502
3503 NULL_CHECK(method, JVMTI_ERROR_INVALID_METHODID);
3504 // get start and end location
3505 (*end_location_ptr) = (jlocation) (method->code_size() - 1);
3506 if (method->code_size() == 0) {
3507 // there is no code so there is no start location
3508 (*start_location_ptr) = (jlocation)(-1);
3509 } else {
3510 (*start_location_ptr) = (jlocation)(0);
3511 }
3512
3513 return JVMTI_ERROR_NONE;
3514 } /* end GetMethodLocation */
3515
3516
3517 // method - pre-checked for validity, but may be null meaning obsolete method
3518 // entry_count_ptr - pre-checked for null
3519 // table_ptr - pre-checked for null
3520 jvmtiError
3521 JvmtiEnv::GetLocalVariableTable(Method* method, jint* entry_count_ptr, jvmtiLocalVariableEntry** table_ptr) {
3522
3523 NULL_CHECK(method, JVMTI_ERROR_INVALID_METHODID);
3524 JavaThread* current_thread = JavaThread::current();
3525
3526 // does the klass have any local variable information?
3527 InstanceKlass* ik = method->method_holder();
3528 if (!ik->has_localvariable_table()) {
3529 return (JVMTI_ERROR_ABSENT_INFORMATION);
3530 }
3531
3532 ConstantPool* constants = method->constants();
3533 NULL_CHECK(constants, JVMTI_ERROR_ABSENT_INFORMATION);
3534
3535 // in the vm localvariable table representation, 6 consecutive elements in the table
3536 // represent a 6-tuple of shorts
3537 // [start_pc, length, name_index, descriptor_index, signature_index, index]
3538 jint num_entries = method->localvariable_table_length();
3539 jvmtiLocalVariableEntry *jvmti_table = (jvmtiLocalVariableEntry *)
3540 jvmtiMalloc(num_entries * (sizeof(jvmtiLocalVariableEntry)));
3541
3542 if (num_entries > 0) {
3543 LocalVariableTableElement* table = method->localvariable_table_start();
3544 for (int i = 0; i < num_entries; i++) {
3545 // get the 5 tuple information from the vm table
3546 jlocation start_location = (jlocation) table[i].start_bci;
3547 jint length = (jint) table[i].length;
3548 int name_index = (int) table[i].name_cp_index;
3549 int signature_index = (int) table[i].descriptor_cp_index;
3550 int generic_signature_index = (int) table[i].signature_cp_index;
3551 jint slot = (jint) table[i].slot;
3552
3553 // get utf8 name and signature
3554 char *name_buf = nullptr;
3555 char *sig_buf = nullptr;
3556 char *gen_sig_buf = nullptr;
3557 {
3558 ResourceMark rm(current_thread);
3559
3560 const char *utf8_name = (const char *) constants->symbol_at(name_index)->as_utf8();
3561 name_buf = (char *) jvmtiMalloc(strlen(utf8_name)+1);
3562 strcpy(name_buf, utf8_name);
3563
3564 const char *utf8_signature = (const char *) constants->symbol_at(signature_index)->as_utf8();
3565 sig_buf = (char *) jvmtiMalloc(strlen(utf8_signature)+1);
3566 strcpy(sig_buf, utf8_signature);
3567
3568 if (generic_signature_index > 0) {
3569 const char *utf8_gen_sign = (const char *)
3570 constants->symbol_at(generic_signature_index)->as_utf8();
3571 gen_sig_buf = (char *) jvmtiMalloc(strlen(utf8_gen_sign)+1);
3572 strcpy(gen_sig_buf, utf8_gen_sign);
3573 }
3574 }
3575
3576 // fill in the jvmti local variable table
3577 jvmti_table[i].start_location = start_location;
3578 jvmti_table[i].length = length;
3579 jvmti_table[i].name = name_buf;
3580 jvmti_table[i].signature = sig_buf;
3581 jvmti_table[i].generic_signature = gen_sig_buf;
3582 jvmti_table[i].slot = slot;
3583 }
3584 }
3585
3586 // set results
3587 (*entry_count_ptr) = num_entries;
3588 (*table_ptr) = jvmti_table;
3589
3590 return JVMTI_ERROR_NONE;
3591 } /* end GetLocalVariableTable */
3592
3593
3594 // method - pre-checked for validity, but may be null meaning obsolete method
3595 // bytecode_count_ptr - pre-checked for null
3596 // bytecodes_ptr - pre-checked for null
3597 jvmtiError
3598 JvmtiEnv::GetBytecodes(Method* method, jint* bytecode_count_ptr, unsigned char** bytecodes_ptr) {
3599 NULL_CHECK(method, JVMTI_ERROR_INVALID_METHODID);
3600
3601 methodHandle mh(Thread::current(), method);
3602 jint size = (jint)mh->code_size();
3603 jvmtiError err = allocate(size, bytecodes_ptr);
3604 if (err != JVMTI_ERROR_NONE) {
3605 return err;
3606 }
3607
3608 (*bytecode_count_ptr) = size;
3609 // get byte codes
3610 JvmtiClassFileReconstituter::copy_bytecodes(mh, *bytecodes_ptr);
3611
3612 return JVMTI_ERROR_NONE;
3613 } /* end GetBytecodes */
3614
3615
3616 // method - pre-checked for validity, but may be null meaning obsolete method
3617 // is_native_ptr - pre-checked for null
3618 jvmtiError
3619 JvmtiEnv::IsMethodNative(Method* method, jboolean* is_native_ptr) {
3620 NULL_CHECK(method, JVMTI_ERROR_INVALID_METHODID);
3621 (*is_native_ptr) = method->is_native();
3622 return JVMTI_ERROR_NONE;
3623 } /* end IsMethodNative */
3624
3625
3626 // method - pre-checked for validity, but may be null meaning obsolete method
3627 // is_synthetic_ptr - pre-checked for null
3628 jvmtiError
3629 JvmtiEnv::IsMethodSynthetic(Method* method, jboolean* is_synthetic_ptr) {
3630 NULL_CHECK(method, JVMTI_ERROR_INVALID_METHODID);
3631 (*is_synthetic_ptr) = method->is_synthetic();
3632 return JVMTI_ERROR_NONE;
3633 } /* end IsMethodSynthetic */
3634
3635
3636 // method - pre-checked for validity, but may be null meaning obsolete method
3637 // is_obsolete_ptr - pre-checked for null
3638 jvmtiError
3639 JvmtiEnv::IsMethodObsolete(Method* method, jboolean* is_obsolete_ptr) {
3640 if (use_version_1_0_semantics() &&
3641 get_capabilities()->can_redefine_classes == 0) {
3642 // This JvmtiEnv requested version 1.0 semantics and this function
3643 // requires the can_redefine_classes capability in version 1.0 so
3644 // we need to return an error here.
3645 return JVMTI_ERROR_MUST_POSSESS_CAPABILITY;
3646 }
3647
3648 if (method == nullptr || method->is_obsolete()) {
3649 *is_obsolete_ptr = true;
3650 } else {
3651 *is_obsolete_ptr = false;
3652 }
3653 return JVMTI_ERROR_NONE;
3654 } /* end IsMethodObsolete */
3655
3656 //
3657 // Raw Monitor functions
3658 //
3659
3660 // name - pre-checked for null
3661 // monitor_ptr - pre-checked for null
3662 jvmtiError
3663 JvmtiEnv::CreateRawMonitor(const char* name, jrawMonitorID* monitor_ptr) {
3664 JvmtiRawMonitor* rmonitor = new (std::nothrow) JvmtiRawMonitor(name);
3665 NULL_CHECK(rmonitor, JVMTI_ERROR_OUT_OF_MEMORY);
3666
3667 *monitor_ptr = (jrawMonitorID)rmonitor;
3668
3669 return JVMTI_ERROR_NONE;
3670 } /* end CreateRawMonitor */
3671
3672
3673 // rmonitor - pre-checked for validity
3674 jvmtiError
3675 JvmtiEnv::DestroyRawMonitor(JvmtiRawMonitor * rmonitor) {
3676 if (Threads::number_of_threads() == 0) {
3677 // Remove this monitor from pending raw monitors list
3678 // if it has entered in onload or start phase.
3679 JvmtiPendingMonitors::destroy(rmonitor);
3680 } else {
3681 Thread* thread = Thread::current();
3682 if (rmonitor->owner() == thread) {
3683 // The caller owns this monitor which we are about to destroy.
3684 // We exit the underlying synchronization object so that the
3685 // "delete monitor" call below can work without an assertion
3686 // failure on systems that don't like destroying synchronization
3687 // objects that are locked.
3688 int r;
3689 int recursion = rmonitor->recursions();
3690 for (int i = 0; i <= recursion; i++) {
3691 r = rmonitor->raw_exit(thread);
3692 assert(r == JvmtiRawMonitor::M_OK, "raw_exit should have worked");
3693 if (r != JvmtiRawMonitor::M_OK) { // robustness
3694 return JVMTI_ERROR_INTERNAL;
3695 }
3696 }
3697 }
3698 if (rmonitor->owner() != nullptr) {
3699 // The caller is trying to destroy a monitor that is locked by
3700 // someone else. While this is not forbidden by the JVMTI
3701 // spec, it will cause an assertion failure on systems that don't
3702 // like destroying synchronization objects that are locked.
3703 // We indicate a problem with the error return (and leak the
3704 // monitor's memory).
3705 return JVMTI_ERROR_NOT_MONITOR_OWNER;
3706 }
3707 }
3708
3709 delete rmonitor;
3710
3711 return JVMTI_ERROR_NONE;
3712 } /* end DestroyRawMonitor */
3713
3714
3715 // rmonitor - pre-checked for validity
3716 jvmtiError
3717 JvmtiEnv::RawMonitorEnter(JvmtiRawMonitor * rmonitor) {
3718 if (Threads::number_of_threads() == 0) {
3719 // No JavaThreads exist so JvmtiRawMonitor enter cannot be
3720 // used, add this raw monitor to the pending list.
3721 // The pending monitors will be actually entered when
3722 // the VM is setup.
3723 // See transition_pending_raw_monitors in create_vm()
3724 // in thread.cpp.
3725 JvmtiPendingMonitors::enter(rmonitor);
3726 } else {
3727 Thread* thread = Thread::current();
3728 // 8266889: raw_enter changes Java thread state, needs WXWrite
3729 MACOS_AARCH64_ONLY(ThreadWXEnable __wx(WXWrite, thread));
3730 rmonitor->raw_enter(thread);
3731 }
3732 return JVMTI_ERROR_NONE;
3733 } /* end RawMonitorEnter */
3734
3735
3736 // rmonitor - pre-checked for validity
3737 jvmtiError
3738 JvmtiEnv::RawMonitorExit(JvmtiRawMonitor * rmonitor) {
3739 jvmtiError err = JVMTI_ERROR_NONE;
3740
3741 if (Threads::number_of_threads() == 0) {
3742 // No JavaThreads exist so just remove this monitor from the pending list.
3743 // Bool value from exit is false if rmonitor is not in the list.
3744 if (!JvmtiPendingMonitors::exit(rmonitor)) {
3745 err = JVMTI_ERROR_NOT_MONITOR_OWNER;
3746 }
3747 } else {
3748 Thread* thread = Thread::current();
3749 int r = rmonitor->raw_exit(thread);
3750 if (r == JvmtiRawMonitor::M_ILLEGAL_MONITOR_STATE) {
3751 err = JVMTI_ERROR_NOT_MONITOR_OWNER;
3752 }
3753 }
3754 return err;
3755 } /* end RawMonitorExit */
3756
3757
3758 // rmonitor - pre-checked for validity
3759 jvmtiError
3760 JvmtiEnv::RawMonitorWait(JvmtiRawMonitor * rmonitor, jlong millis) {
3761 Thread* thread = Thread::current();
3762 // 8266889: raw_wait changes Java thread state, needs WXWrite
3763 MACOS_AARCH64_ONLY(ThreadWXEnable __wx(WXWrite, thread));
3764 int r = rmonitor->raw_wait(millis, thread);
3765
3766 switch (r) {
3767 case JvmtiRawMonitor::M_INTERRUPTED:
3768 return JVMTI_ERROR_INTERRUPT;
3769 case JvmtiRawMonitor::M_ILLEGAL_MONITOR_STATE:
3770 return JVMTI_ERROR_NOT_MONITOR_OWNER;
3771 default:
3772 return JVMTI_ERROR_NONE;
3773 }
3774 } /* end RawMonitorWait */
3775
3776
3777 // rmonitor - pre-checked for validity
3778 jvmtiError
3779 JvmtiEnv::RawMonitorNotify(JvmtiRawMonitor * rmonitor) {
3780 Thread* thread = Thread::current();
3781 int r = rmonitor->raw_notify(thread);
3782
3783 if (r == JvmtiRawMonitor::M_ILLEGAL_MONITOR_STATE) {
3784 return JVMTI_ERROR_NOT_MONITOR_OWNER;
3785 }
3786 return JVMTI_ERROR_NONE;
3787 } /* end RawMonitorNotify */
3788
3789
3790 // rmonitor - pre-checked for validity
3791 jvmtiError
3792 JvmtiEnv::RawMonitorNotifyAll(JvmtiRawMonitor * rmonitor) {
3793 Thread* thread = Thread::current();
3794 int r = rmonitor->raw_notifyAll(thread);
3795
3796 if (r == JvmtiRawMonitor::M_ILLEGAL_MONITOR_STATE) {
3797 return JVMTI_ERROR_NOT_MONITOR_OWNER;
3798 }
3799 return JVMTI_ERROR_NONE;
3800 } /* end RawMonitorNotifyAll */
3801
3802
3803 //
3804 // JNI Function Interception functions
3805 //
3806
3807
3808 // function_table - pre-checked for null
3809 jvmtiError
3810 JvmtiEnv::SetJNIFunctionTable(const jniNativeInterface* function_table) {
3811 // Copy jni function table at safepoint.
3812 VM_JNIFunctionTableCopier copier(function_table);
3813 VMThread::execute(&copier);
3814
3815 return JVMTI_ERROR_NONE;
3816 } /* end SetJNIFunctionTable */
3817
3818
3819 // function_table - pre-checked for null
3820 jvmtiError
3821 JvmtiEnv::GetJNIFunctionTable(jniNativeInterface** function_table) {
3822 *function_table=(jniNativeInterface*)jvmtiMalloc(sizeof(jniNativeInterface));
3823 if (*function_table == nullptr)
3824 return JVMTI_ERROR_OUT_OF_MEMORY;
3825 memcpy(*function_table,(JavaThread::current())->get_jni_functions(),sizeof(jniNativeInterface));
3826 return JVMTI_ERROR_NONE;
3827 } /* end GetJNIFunctionTable */
3828
3829
3830 //
3831 // Event Management functions
3832 //
3833
3834 jvmtiError
3835 JvmtiEnv::GenerateEvents(jvmtiEvent event_type) {
3836 // can only generate two event types
3837 if (event_type != JVMTI_EVENT_COMPILED_METHOD_LOAD &&
3838 event_type != JVMTI_EVENT_DYNAMIC_CODE_GENERATED) {
3839 return JVMTI_ERROR_ILLEGAL_ARGUMENT;
3840 }
3841
3842 // for compiled_method_load events we must check that the environment
3843 // has the can_generate_compiled_method_load_events capability.
3844 if (event_type == JVMTI_EVENT_COMPILED_METHOD_LOAD) {
3845 if (get_capabilities()->can_generate_compiled_method_load_events == 0) {
3846 return JVMTI_ERROR_MUST_POSSESS_CAPABILITY;
3847 }
3848 return JvmtiCodeBlobEvents::generate_compiled_method_load_events(this);
3849 } else {
3850 return JvmtiCodeBlobEvents::generate_dynamic_code_events(this);
3851 }
3852
3853 } /* end GenerateEvents */
3854
3855
3856 //
3857 // Extension Mechanism functions
3858 //
3859
3860 // extension_count_ptr - pre-checked for null
3861 // extensions - pre-checked for null
3862 jvmtiError
3863 JvmtiEnv::GetExtensionFunctions(jint* extension_count_ptr, jvmtiExtensionFunctionInfo** extensions) {
3864 return JvmtiExtensions::get_functions(this, extension_count_ptr, extensions);
3865 } /* end GetExtensionFunctions */
3866
3867
3868 // extension_count_ptr - pre-checked for null
3869 // extensions - pre-checked for null
3870 jvmtiError
3871 JvmtiEnv::GetExtensionEvents(jint* extension_count_ptr, jvmtiExtensionEventInfo** extensions) {
3872 return JvmtiExtensions::get_events(this, extension_count_ptr, extensions);
3873 } /* end GetExtensionEvents */
3874
3875
3876 // callback - null is a valid value, must be checked
3877 jvmtiError
3878 JvmtiEnv::SetExtensionEventCallback(jint extension_event_index, jvmtiExtensionEvent callback) {
3879 return JvmtiExtensions::set_event_callback(this, extension_event_index, callback);
3880 } /* end SetExtensionEventCallback */
3881
3882 //
3883 // Timers functions
3884 //
3885
3886 // info_ptr - pre-checked for null
3887 jvmtiError
3888 JvmtiEnv::GetCurrentThreadCpuTimerInfo(jvmtiTimerInfo* info_ptr) {
3889 os::current_thread_cpu_time_info(info_ptr);
3890 return JVMTI_ERROR_NONE;
3891 } /* end GetCurrentThreadCpuTimerInfo */
3892
3893
3894 // nanos_ptr - pre-checked for null
3895 jvmtiError
3896 JvmtiEnv::GetCurrentThreadCpuTime(jlong* nanos_ptr) {
3897 Thread* thread = Thread::current();
3898
3899 // Surprisingly the GetCurrentThreadCpuTime is used by non-JavaThread's.
3900 if (thread->is_Java_thread()) {
3901 if (JavaThread::cast(thread)->is_vthread_mounted()) {
3902 // No support for a VirtualThread (yet).
3903 return JVMTI_ERROR_UNSUPPORTED_OPERATION;
3904 }
3905 }
3906 *nanos_ptr = os::current_thread_cpu_time();
3907 return JVMTI_ERROR_NONE;
3908 } /* end GetCurrentThreadCpuTime */
3909
3910
3911 // info_ptr - pre-checked for null
3912 jvmtiError
3913 JvmtiEnv::GetThreadCpuTimerInfo(jvmtiTimerInfo* info_ptr) {
3914 os::thread_cpu_time_info(info_ptr);
3915 return JVMTI_ERROR_NONE;
3916 } /* end GetThreadCpuTimerInfo */
3917
3918
3919 // nanos_ptr - pre-checked for null
3920 jvmtiError
3921 JvmtiEnv::GetThreadCpuTime(jthread thread, jlong* nanos_ptr) {
3922 JavaThread* current_thread = JavaThread::current();
3923 ThreadsListHandle tlh(current_thread);
3924 JavaThread* java_thread = nullptr;
3925 oop thread_oop = nullptr;
3926
3927 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, &java_thread, &thread_oop);
3928
3929 if (thread_oop != nullptr && thread_oop->is_a(vmClasses::BaseVirtualThread_klass())) {
3930 // No support for virtual threads (yet).
3931 return JVMTI_ERROR_UNSUPPORTED_OPERATION;
3932 }
3933 if (err != JVMTI_ERROR_NONE) {
3934 return err;
3935 }
3936 NULL_CHECK(nanos_ptr, JVMTI_ERROR_NULL_POINTER);
3937
3938 *nanos_ptr = os::thread_cpu_time(java_thread);
3939 return JVMTI_ERROR_NONE;
3940 } /* end GetThreadCpuTime */
3941
3942
3943 // info_ptr - pre-checked for null
3944 jvmtiError
3945 JvmtiEnv::GetTimerInfo(jvmtiTimerInfo* info_ptr) {
3946 os::javaTimeNanos_info(info_ptr);
3947 return JVMTI_ERROR_NONE;
3948 } /* end GetTimerInfo */
3949
3950
3951 // nanos_ptr - pre-checked for null
3952 jvmtiError
3953 JvmtiEnv::GetTime(jlong* nanos_ptr) {
3954 *nanos_ptr = os::javaTimeNanos();
3955 return JVMTI_ERROR_NONE;
3956 } /* end GetTime */
3957
3958
3959 // processor_count_ptr - pre-checked for null
3960 jvmtiError
3961 JvmtiEnv::GetAvailableProcessors(jint* processor_count_ptr) {
3962 *processor_count_ptr = os::active_processor_count();
3963 return JVMTI_ERROR_NONE;
3964 } /* end GetAvailableProcessors */
3965
3966 jvmtiError
3967 JvmtiEnv::SetHeapSamplingInterval(jint sampling_interval) {
3968 if (sampling_interval < 0) {
3969 return JVMTI_ERROR_ILLEGAL_ARGUMENT;
3970 }
3971 ThreadHeapSampler::set_sampling_interval(sampling_interval);
3972 return JVMTI_ERROR_NONE;
3973 } /* end SetHeapSamplingInterval */
3974
3975 //
3976 // System Properties functions
3977 //
3978
3979 // count_ptr - pre-checked for null
3980 // property_ptr - pre-checked for null
3981 jvmtiError
3982 JvmtiEnv::GetSystemProperties(jint* count_ptr, char*** property_ptr) {
3983 jvmtiError err = JVMTI_ERROR_NONE;
3984
3985 // Get the number of readable properties.
3986 *count_ptr = Arguments::PropertyList_readable_count(Arguments::system_properties());
3987
3988 // Allocate memory to hold the exact number of readable properties.
3989 err = allocate(*count_ptr * sizeof(char *), (unsigned char **)property_ptr);
3990 if (err != JVMTI_ERROR_NONE) {
3991 return err;
3992 }
3993 int readable_count = 0;
3994 // Loop through the system properties until all the readable properties are found.
3995 for (SystemProperty* p = Arguments::system_properties(); p != nullptr && readable_count < *count_ptr; p = p->next()) {
3996 if (p->readable()) {
3997 const char *key = p->key();
3998 char **tmp_value = *property_ptr+readable_count;
3999 readable_count++;
4000 err = allocate((strlen(key)+1) * sizeof(char), (unsigned char**)tmp_value);
4001 if (err == JVMTI_ERROR_NONE) {
4002 strcpy(*tmp_value, key);
4003 } else {
4004 // clean up previously allocated memory.
4005 for (int j = 0; j < readable_count; j++) {
4006 Deallocate((unsigned char*)*property_ptr+j);
4007 }
4008 Deallocate((unsigned char*)property_ptr);
4009 break;
4010 }
4011 }
4012 }
4013 assert(err != JVMTI_ERROR_NONE || readable_count == *count_ptr, "Bad readable property count");
4014 return err;
4015 } /* end GetSystemProperties */
4016
4017
4018 // property - pre-checked for null
4019 // value_ptr - pre-checked for null
4020 jvmtiError
4021 JvmtiEnv::GetSystemProperty(const char* property, char** value_ptr) {
4022 jvmtiError err = JVMTI_ERROR_NONE;
4023 const char *value;
4024
4025 // Return JVMTI_ERROR_NOT_AVAILABLE if property is not readable or doesn't exist.
4026 value = Arguments::PropertyList_get_readable_value(Arguments::system_properties(), property);
4027 if (value == nullptr) {
4028 err = JVMTI_ERROR_NOT_AVAILABLE;
4029 } else {
4030 err = allocate((strlen(value)+1) * sizeof(char), (unsigned char **)value_ptr);
4031 if (err == JVMTI_ERROR_NONE) {
4032 strcpy(*value_ptr, value);
4033 }
4034 }
4035 return err;
4036 } /* end GetSystemProperty */
4037
4038
4039 // property - pre-checked for null
4040 // value - null is a valid value, must be checked
4041 jvmtiError
4042 JvmtiEnv::SetSystemProperty(const char* property, const char* value_ptr) {
4043 for (SystemProperty* p = Arguments::system_properties(); p != nullptr; p = p->next()) {
4044 if (strcmp(property, p->key()) == 0) {
4045 if (p->writeable()) {
4046 if (p->set_value(value_ptr, AllocFailStrategy::RETURN_NULL)) {
4047 return JVMTI_ERROR_NONE;
4048 } else {
4049 return JVMTI_ERROR_OUT_OF_MEMORY;
4050 }
4051 } else {
4052 // We found a property, but it's not writeable
4053 return JVMTI_ERROR_NOT_AVAILABLE;
4054 }
4055 }
4056 }
4057
4058 // We cannot find a property of the given name
4059 return JVMTI_ERROR_NOT_AVAILABLE;
4060 } /* end SetSystemProperty */