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(event_thread);
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 if (thread_oop != nullptr && thread_oop->is_a(vmClasses::BaseVirtualThread_klass())) {
1194 // No support for virtual threads (yet).
1195 return JVMTI_ERROR_UNSUPPORTED_OPERATION;
1196 }
1197 if (err != JVMTI_ERROR_NONE) {
1198 return err;
1199 }
1200 oop e = JNIHandles::resolve_external_guard(exception);
1201 NULL_CHECK(e, JVMTI_ERROR_NULL_POINTER);
1202
1203 JavaThread::send_async_exception(java_thread, e);
1204
1205 return JVMTI_ERROR_NONE;
1206
1207 } /* end StopThread */
1208
1209
1210 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
1211 jvmtiError
1212 JvmtiEnv::InterruptThread(jthread thread) {
1213 JavaThread* current_thread = JavaThread::current();
1214 HandleMark hm(current_thread);
1215
1216 JvmtiVTMSTransitionDisabler disabler(thread);
1217 ThreadsListHandle tlh(current_thread);
1218
1219 JavaThread* java_thread = nullptr;
1220 oop thread_obj = nullptr;
1221 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, &java_thread, &thread_obj);
1222 if (err != JVMTI_ERROR_NONE) {
1223 return err;
1224 }
1225
1226 if (java_lang_VirtualThread::is_instance(thread_obj)) {
1227 // For virtual threads we have to call into Java to interrupt:
1228 Handle obj(current_thread, thread_obj);
1229 JavaValue result(T_VOID);
1230 JavaCalls::call_virtual(&result,
1231 obj,
1232 vmClasses::Thread_klass(),
1233 vmSymbols::interrupt_method_name(),
1234 vmSymbols::void_method_signature(),
1235 current_thread);
1236
1237 return JVMTI_ERROR_NONE;
1238 }
1239
1240 // Really this should be a Java call to Thread.interrupt to ensure the same
1241 // semantics, however historically this has not been done for some reason.
1242 // So we continue with that (which means we don't interact with any Java-level
1243 // Interruptible object) but we must set the Java-level interrupted state.
1244 java_lang_Thread::set_interrupted(thread_obj, true);
1245 java_thread->interrupt();
1246
1247 return JVMTI_ERROR_NONE;
1248 } /* end InterruptThread */
1249
1250
1251 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
1252 // info_ptr - pre-checked for null
1253 jvmtiError
1254 JvmtiEnv::GetThreadInfo(jthread thread, jvmtiThreadInfo* info_ptr) {
1255 JavaThread* current_thread = JavaThread::current();
1256 ResourceMark rm(current_thread);
1257 HandleMark hm(current_thread);
1258 JavaThread* java_thread = nullptr;
1259 oop thread_oop = nullptr;
1260
1261 JvmtiVTMSTransitionDisabler disabler(thread);
1262 ThreadsListHandle tlh(current_thread);
1263
1264 // if thread is null the current thread is used
1265 if (thread == nullptr) {
1266 java_thread = JavaThread::current();
1267 thread_oop = get_vthread_or_thread_oop(java_thread);
1268 if (thread_oop == nullptr || !thread_oop->is_a(vmClasses::Thread_klass())) {
1269 return JVMTI_ERROR_INVALID_THREAD;
1270 }
1271 } else {
1272 jvmtiError err = JvmtiExport::cv_external_thread_to_JavaThread(tlh.list(), thread, &java_thread, &thread_oop);
1273 if (err != JVMTI_ERROR_NONE) {
1274 // We got an error code so we don't have a JavaThread *, but
1275 // only return an error from here if we didn't get a valid
1276 // thread_oop.
1277 // In the virtual thread case the cv_external_thread_to_JavaThread is expected to correctly set
1278 // the thread_oop and return JVMTI_ERROR_INVALID_THREAD which we ignore here.
1279 if (thread_oop == nullptr) {
1280 return err;
1281 }
1282 }
1283 }
1284 // We have a valid thread_oop so we can return some thread info.
1285
1286 Handle thread_obj(current_thread, thread_oop);
1287 Handle name;
1288 ThreadPriority priority;
1289 Handle thread_group;
1290 Handle context_class_loader;
1291 bool is_daemon;
1292
1293 name = Handle(current_thread, java_lang_Thread::name(thread_obj()));
1294
1295 if (java_lang_VirtualThread::is_instance(thread_obj())) {
1296 priority = (ThreadPriority)JVMTI_THREAD_NORM_PRIORITY;
1297 is_daemon = true;
1298 if (java_lang_VirtualThread::state(thread_obj()) == java_lang_VirtualThread::TERMINATED) {
1299 thread_group = Handle(current_thread, nullptr);
1300 } else {
1301 thread_group = Handle(current_thread, java_lang_Thread_Constants::get_VTHREAD_GROUP());
1302 }
1303 } else {
1304 priority = java_lang_Thread::priority(thread_obj());
1305 is_daemon = java_lang_Thread::is_daemon(thread_obj());
1306 if (java_lang_Thread::get_thread_status(thread_obj()) == JavaThreadStatus::TERMINATED) {
1307 thread_group = Handle(current_thread, nullptr);
1308 } else {
1309 thread_group = Handle(current_thread, java_lang_Thread::threadGroup(thread_obj()));
1310 }
1311 }
1312
1313 oop loader = java_lang_Thread::context_class_loader(thread_obj());
1314 context_class_loader = Handle(current_thread, loader);
1315
1316 { const char *n;
1317
1318 if (name() != nullptr) {
1319 n = java_lang_String::as_utf8_string(name());
1320 } else {
1321 int utf8_length = 0;
1322 n = UNICODE::as_utf8((jchar*) nullptr, utf8_length);
1323 }
1324
1325 info_ptr->name = (char *) jvmtiMalloc(strlen(n)+1);
1326 if (info_ptr->name == nullptr)
1327 return JVMTI_ERROR_OUT_OF_MEMORY;
1328
1329 strcpy(info_ptr->name, n);
1330 }
1331 info_ptr->is_daemon = is_daemon;
1332 info_ptr->priority = priority;
1333
1334 info_ptr->context_class_loader = (context_class_loader.is_null()) ? nullptr :
1335 jni_reference(context_class_loader);
1336 info_ptr->thread_group = jni_reference(thread_group);
1337
1338 return JVMTI_ERROR_NONE;
1339 } /* end GetThreadInfo */
1340
1341
1342 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
1343 // owned_monitor_count_ptr - pre-checked for null
1344 // owned_monitors_ptr - pre-checked for null
1345 jvmtiError
1346 JvmtiEnv::GetOwnedMonitorInfo(jthread thread, jint* owned_monitor_count_ptr, jobject** owned_monitors_ptr) {
1347 JavaThread* calling_thread = JavaThread::current();
1348 HandleMark hm(calling_thread);
1349
1350 // growable array of jvmti monitors info on the C-heap
1351 GrowableArray<jvmtiMonitorStackDepthInfo*> *owned_monitors_list =
1352 new (mtServiceability) GrowableArray<jvmtiMonitorStackDepthInfo*>(1, mtServiceability);
1353
1354 JvmtiVTMSTransitionDisabler disabler(thread);
1355 ThreadsListHandle tlh(calling_thread);
1356
1357 JavaThread* java_thread = nullptr;
1358 oop thread_oop = nullptr;
1359 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, &java_thread, &thread_oop);
1360 if (err != JVMTI_ERROR_NONE) {
1361 delete owned_monitors_list;
1362 return err;
1363 }
1364
1365 if (java_lang_VirtualThread::is_instance(thread_oop)) {
1366 // There is no monitor info to collect if target virtual thread is unmounted.
1367 if (java_thread != nullptr) {
1368 VirtualThreadGetOwnedMonitorInfoClosure op(this,
1369 Handle(calling_thread, thread_oop),
1370 owned_monitors_list);
1371 Handshake::execute(&op, java_thread);
1372 err = op.result();
1373 }
1374 } else {
1375 EscapeBarrier eb(true, calling_thread, java_thread);
1376 if (!eb.deoptimize_objects(MaxJavaStackTraceDepth)) {
1377 delete owned_monitors_list;
1378 return JVMTI_ERROR_OUT_OF_MEMORY;
1379 }
1380
1381 if (java_thread == calling_thread) {
1382 // It is only safe to make a direct call on the current thread.
1383 // All other usage needs to use a direct handshake for safety.
1384 err = get_owned_monitors(calling_thread, java_thread, owned_monitors_list);
1385 } else {
1386 // get owned monitors info with handshake
1387 GetOwnedMonitorInfoClosure op(calling_thread, this, owned_monitors_list);
1388 Handshake::execute(&op, java_thread);
1389 err = op.result();
1390 }
1391 }
1392
1393 jint owned_monitor_count = owned_monitors_list->length();
1394 if (err == JVMTI_ERROR_NONE) {
1395 if ((err = allocate(owned_monitor_count * sizeof(jobject *),
1396 (unsigned char**)owned_monitors_ptr)) == JVMTI_ERROR_NONE) {
1397 // copy into the returned array
1398 for (int i = 0; i < owned_monitor_count; i++) {
1399 (*owned_monitors_ptr)[i] =
1400 ((jvmtiMonitorStackDepthInfo*)owned_monitors_list->at(i))->monitor;
1401 }
1402 *owned_monitor_count_ptr = owned_monitor_count;
1403 }
1404 }
1405 // clean up.
1406 for (int i = 0; i < owned_monitor_count; i++) {
1407 deallocate((unsigned char*)owned_monitors_list->at(i));
1408 }
1409 delete owned_monitors_list;
1410
1411 return err;
1412 } /* end GetOwnedMonitorInfo */
1413
1414
1415 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
1416 // monitor_info_count_ptr - pre-checked for null
1417 // monitor_info_ptr - pre-checked for null
1418 jvmtiError
1419 JvmtiEnv::GetOwnedMonitorStackDepthInfo(jthread thread, jint* monitor_info_count_ptr, jvmtiMonitorStackDepthInfo** monitor_info_ptr) {
1420 JavaThread* calling_thread = JavaThread::current();
1421 HandleMark hm(calling_thread);
1422
1423 // growable array of jvmti monitors info on the C-heap
1424 GrowableArray<jvmtiMonitorStackDepthInfo*> *owned_monitors_list =
1425 new (mtServiceability) GrowableArray<jvmtiMonitorStackDepthInfo*>(1, mtServiceability);
1426
1427 JvmtiVTMSTransitionDisabler disabler(thread);
1428 ThreadsListHandle tlh(calling_thread);
1429
1430 JavaThread* java_thread = nullptr;
1431 oop thread_oop = nullptr;
1432 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, &java_thread, &thread_oop);
1433 if (err != JVMTI_ERROR_NONE) {
1434 delete owned_monitors_list;
1435 return err;
1436 }
1437
1438 if (java_lang_VirtualThread::is_instance(thread_oop)) {
1439 // There is no monitor info to collect if target virtual thread is unmounted.
1440 if (java_thread != nullptr) {
1441 VirtualThreadGetOwnedMonitorInfoClosure op(this,
1442 Handle(calling_thread, thread_oop),
1443 owned_monitors_list);
1444 Handshake::execute(&op, java_thread);
1445 err = op.result();
1446 }
1447 } else {
1448 EscapeBarrier eb(true, calling_thread, java_thread);
1449 if (!eb.deoptimize_objects(MaxJavaStackTraceDepth)) {
1450 delete owned_monitors_list;
1451 return JVMTI_ERROR_OUT_OF_MEMORY;
1452 }
1453
1454 if (java_thread == calling_thread) {
1455 // It is only safe to make a direct call on the current thread.
1456 // All other usage needs to use a direct handshake for safety.
1457 err = get_owned_monitors(calling_thread, java_thread, owned_monitors_list);
1458 } else {
1459 // get owned monitors info with handshake
1460 GetOwnedMonitorInfoClosure op(calling_thread, this, owned_monitors_list);
1461 Handshake::execute(&op, java_thread);
1462 err = op.result();
1463 }
1464 }
1465 jint owned_monitor_count = owned_monitors_list->length();
1466 if (err == JVMTI_ERROR_NONE) {
1467 if ((err = allocate(owned_monitor_count * sizeof(jvmtiMonitorStackDepthInfo),
1468 (unsigned char**)monitor_info_ptr)) == JVMTI_ERROR_NONE) {
1469 // copy to output array.
1470 for (int i = 0; i < owned_monitor_count; i++) {
1471 (*monitor_info_ptr)[i].monitor =
1472 ((jvmtiMonitorStackDepthInfo*)owned_monitors_list->at(i))->monitor;
1473 (*monitor_info_ptr)[i].stack_depth =
1474 ((jvmtiMonitorStackDepthInfo*)owned_monitors_list->at(i))->stack_depth;
1475 }
1476 }
1477 *monitor_info_count_ptr = owned_monitor_count;
1478 }
1479
1480 // clean up.
1481 for (int i = 0; i < owned_monitor_count; i++) {
1482 deallocate((unsigned char*)owned_monitors_list->at(i));
1483 }
1484 delete owned_monitors_list;
1485
1486 return err;
1487 } /* end GetOwnedMonitorStackDepthInfo */
1488
1489
1490 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
1491 // monitor_ptr - pre-checked for null
1492 jvmtiError
1493 JvmtiEnv::GetCurrentContendedMonitor(jthread thread, jobject* monitor_ptr) {
1494 JavaThread* calling_thread = JavaThread::current();
1495 HandleMark hm(calling_thread);
1496
1497 JvmtiVTMSTransitionDisabler disabler(thread);
1498 ThreadsListHandle tlh(calling_thread);
1499
1500 JavaThread* java_thread = nullptr;
1501 oop thread_oop = nullptr;
1502 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, &java_thread, &thread_oop);
1503 if (err != JVMTI_ERROR_NONE) {
1504 return err;
1505 }
1506
1507 if (java_lang_VirtualThread::is_instance(thread_oop)) {
1508 // There is no monitor info to collect if target virtual thread is unmounted.
1509 if (java_thread != nullptr) {
1510 GetCurrentContendedMonitorClosure op(calling_thread, this, monitor_ptr, /* is_virtual */ true);
1511 Handshake::execute(&op, java_thread);
1512 err = op.result();
1513 } else {
1514 *monitor_ptr = nullptr;
1515 if (!JvmtiEnvBase::is_vthread_alive(thread_oop)) {
1516 err = JVMTI_ERROR_THREAD_NOT_ALIVE;
1517 }
1518 }
1519 return err;
1520 }
1521 if (java_thread == calling_thread) {
1522 // It is only safe to make a direct call on the current thread.
1523 // All other usage needs to use a direct handshake for safety.
1524 err = get_current_contended_monitor(calling_thread, java_thread, monitor_ptr, /* is_virtual */ false);
1525 } else {
1526 // get contended monitor information with handshake
1527 GetCurrentContendedMonitorClosure op(calling_thread, this, monitor_ptr, /* is_virtual */ false);
1528 Handshake::execute(&op, java_thread);
1529 err = op.result();
1530 }
1531 return err;
1532 } /* end GetCurrentContendedMonitor */
1533
1534
1535 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
1536 // proc - pre-checked for null
1537 // arg - null is a valid value, must be checked
1538 jvmtiError
1539 JvmtiEnv::RunAgentThread(jthread thread, jvmtiStartFunction proc, const void* arg, jint priority) {
1540 JavaThread* current_thread = JavaThread::current();
1541
1542 JavaThread* java_thread = nullptr;
1543 oop thread_oop = nullptr;
1544 ThreadsListHandle tlh(current_thread);
1545 jvmtiError err = JvmtiExport::cv_external_thread_to_JavaThread(tlh.list(), thread, &java_thread, &thread_oop);
1546 if (err != JVMTI_ERROR_NONE) {
1547 // We got an error code so we don't have a JavaThread *, but
1548 // only return an error from here if we didn't get a valid
1549 // thread_oop.
1550 if (thread_oop == nullptr) {
1551 return err;
1552 }
1553 // We have a valid thread_oop.
1554 }
1555
1556 if (thread_oop->is_a(vmClasses::BaseVirtualThread_klass())) {
1557 // No support for virtual threads.
1558 return JVMTI_ERROR_UNSUPPORTED_OPERATION;
1559 }
1560 if (java_thread != nullptr) {
1561 // 'thread' refers to an existing JavaThread.
1562 return JVMTI_ERROR_INVALID_THREAD;
1563 }
1564
1565 if (priority < JVMTI_THREAD_MIN_PRIORITY || priority > JVMTI_THREAD_MAX_PRIORITY) {
1566 return JVMTI_ERROR_INVALID_PRIORITY;
1567 }
1568
1569 Handle thread_hndl(current_thread, thread_oop);
1570
1571 JvmtiAgentThread* new_thread = new JvmtiAgentThread(this, proc, arg);
1572
1573 // At this point it may be possible that no osthread was created for the
1574 // JavaThread due to lack of resources.
1575 if (new_thread->osthread() == nullptr) {
1576 // The new thread is not known to Thread-SMR yet so we can just delete.
1577 delete new_thread;
1578 return JVMTI_ERROR_OUT_OF_MEMORY;
1579 }
1580
1581 JavaThread::start_internal_daemon(current_thread, new_thread, thread_hndl,
1582 (ThreadPriority)priority);
1583
1584 return JVMTI_ERROR_NONE;
1585 } /* end RunAgentThread */
1586
1587 //
1588 // Thread Group functions
1589 //
1590
1591 // group_count_ptr - pre-checked for null
1592 // groups_ptr - pre-checked for null
1593 jvmtiError
1594 JvmtiEnv::GetTopThreadGroups(jint* group_count_ptr, jthreadGroup** groups_ptr) {
1595 JavaThread* current_thread = JavaThread::current();
1596
1597 // Only one top level thread group now.
1598 *group_count_ptr = 1;
1599
1600 // Allocate memory to store global-refs to the thread groups.
1601 // Assume this area is freed by caller.
1602 *groups_ptr = (jthreadGroup *) jvmtiMalloc((sizeof(jthreadGroup)) * (*group_count_ptr));
1603
1604 NULL_CHECK(*groups_ptr, JVMTI_ERROR_OUT_OF_MEMORY);
1605
1606 // Convert oop to Handle, then convert Handle to global-ref.
1607 {
1608 HandleMark hm(current_thread);
1609 Handle system_thread_group(current_thread, Universe::system_thread_group());
1610 *groups_ptr[0] = jni_reference(system_thread_group);
1611 }
1612
1613 return JVMTI_ERROR_NONE;
1614 } /* end GetTopThreadGroups */
1615
1616
1617 // info_ptr - pre-checked for null
1618 jvmtiError
1619 JvmtiEnv::GetThreadGroupInfo(jthreadGroup group, jvmtiThreadGroupInfo* info_ptr) {
1620 Thread* current_thread = Thread::current();
1621 ResourceMark rm(current_thread);
1622 HandleMark hm(current_thread);
1623
1624 Handle group_obj (current_thread, JNIHandles::resolve_external_guard(group));
1625 NULL_CHECK(group_obj(), JVMTI_ERROR_INVALID_THREAD_GROUP);
1626
1627 const char* name;
1628 Handle parent_group;
1629 bool is_daemon;
1630 ThreadPriority max_priority;
1631
1632 name = java_lang_ThreadGroup::name(group_obj());
1633 parent_group = Handle(current_thread, java_lang_ThreadGroup::parent(group_obj()));
1634 is_daemon = java_lang_ThreadGroup::is_daemon(group_obj());
1635 max_priority = java_lang_ThreadGroup::maxPriority(group_obj());
1636
1637 info_ptr->is_daemon = is_daemon;
1638 info_ptr->max_priority = max_priority;
1639 info_ptr->parent = jni_reference(parent_group);
1640
1641 if (name != nullptr) {
1642 info_ptr->name = (char*)jvmtiMalloc(strlen(name)+1);
1643 NULL_CHECK(info_ptr->name, JVMTI_ERROR_OUT_OF_MEMORY);
1644 strcpy(info_ptr->name, name);
1645 } else {
1646 info_ptr->name = nullptr;
1647 }
1648
1649 return JVMTI_ERROR_NONE;
1650 } /* end GetThreadGroupInfo */
1651
1652 // thread_count_ptr - pre-checked for null
1653 // threads_ptr - pre-checked for null
1654 // group_count_ptr - pre-checked for null
1655 // groups_ptr - pre-checked for null
1656 jvmtiError
1657 JvmtiEnv::GetThreadGroupChildren(jthreadGroup group, jint* thread_count_ptr, jthread** threads_ptr, jint* group_count_ptr, jthreadGroup** groups_ptr) {
1658 jvmtiError err;
1659 JavaThread* current_thread = JavaThread::current();
1660 oop group_obj = JNIHandles::resolve_external_guard(group);
1661 NULL_CHECK(group_obj, JVMTI_ERROR_INVALID_THREAD_GROUP);
1662
1663 Handle *thread_objs = nullptr;
1664 objArrayHandle group_objs;
1665 jint nthreads = 0;
1666 jint ngroups = 0;
1667 int hidden_threads = 0;
1668
1669 ResourceMark rm(current_thread);
1670 HandleMark hm(current_thread);
1671
1672 Handle group_hdl(current_thread, group_obj);
1673
1674 err = get_live_threads(current_thread, group_hdl, &nthreads, &thread_objs);
1675 if (err != JVMTI_ERROR_NONE) {
1676 return err;
1677 }
1678 err = get_subgroups(current_thread, group_hdl, &ngroups, &group_objs);
1679 if (err != JVMTI_ERROR_NONE) {
1680 return err;
1681 }
1682
1683 *group_count_ptr = ngroups;
1684 *thread_count_ptr = nthreads;
1685 *threads_ptr = new_jthreadArray(nthreads, thread_objs);
1686 *groups_ptr = new_jthreadGroupArray(ngroups, group_objs);
1687 if (nthreads > 0 && *threads_ptr == nullptr) {
1688 return JVMTI_ERROR_OUT_OF_MEMORY;
1689 }
1690 if (ngroups > 0 && *groups_ptr == nullptr) {
1691 return JVMTI_ERROR_OUT_OF_MEMORY;
1692 }
1693
1694 return JVMTI_ERROR_NONE;
1695 } /* end GetThreadGroupChildren */
1696
1697
1698 //
1699 // Stack Frame functions
1700 //
1701
1702 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
1703 // max_frame_count - pre-checked to be greater than or equal to 0
1704 // frame_buffer - pre-checked for null
1705 // count_ptr - pre-checked for null
1706 jvmtiError
1707 JvmtiEnv::GetStackTrace(jthread thread, jint start_depth, jint max_frame_count, jvmtiFrameInfo* frame_buffer, jint* count_ptr) {
1708 JavaThread* current_thread = JavaThread::current();
1709 HandleMark hm(current_thread);
1710
1711 JvmtiVTMSTransitionDisabler disabler(thread);
1712 ThreadsListHandle tlh(current_thread);
1713
1714 JavaThread* java_thread = nullptr;
1715 oop thread_obj = nullptr;
1716 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, &java_thread, &thread_obj);
1717 if (err != JVMTI_ERROR_NONE) {
1718 return err;
1719 }
1720
1721 if (java_lang_VirtualThread::is_instance(thread_obj)) {
1722 if (java_thread == nullptr) { // Target virtual thread is unmounted.
1723 ResourceMark rm(current_thread);
1724
1725 VM_VirtualThreadGetStackTrace op(this, Handle(current_thread, thread_obj),
1726 start_depth, max_frame_count,
1727 frame_buffer, count_ptr);
1728 VMThread::execute(&op);
1729 return op.result();
1730 }
1731 VirtualThreadGetStackTraceClosure op(this, Handle(current_thread, thread_obj),
1732 start_depth, max_frame_count, frame_buffer, count_ptr);
1733 Handshake::execute(&op, java_thread);
1734 return op.result();
1735 }
1736
1737 // It is only safe to perform the direct operation on the current
1738 // thread. All other usage needs to use a direct handshake for safety.
1739 if (java_thread == JavaThread::current()) {
1740 err = get_stack_trace(java_thread, start_depth, max_frame_count, frame_buffer, count_ptr);
1741 } else {
1742 // Get stack trace with handshake.
1743 GetStackTraceClosure op(this, start_depth, max_frame_count, frame_buffer, count_ptr);
1744 Handshake::execute(&op, java_thread);
1745 err = op.result();
1746 }
1747
1748 return err;
1749 } /* end GetStackTrace */
1750
1751
1752 // max_frame_count - pre-checked to be greater than or equal to 0
1753 // stack_info_ptr - pre-checked for null
1754 // thread_count_ptr - pre-checked for null
1755 jvmtiError
1756 JvmtiEnv::GetAllStackTraces(jint max_frame_count, jvmtiStackInfo** stack_info_ptr, jint* thread_count_ptr) {
1757 jvmtiError err = JVMTI_ERROR_NONE;
1758 JavaThread* calling_thread = JavaThread::current();
1759
1760 // JVMTI get stack traces at safepoint.
1761 VM_GetAllStackTraces op(this, calling_thread, max_frame_count);
1762 VMThread::execute(&op);
1763 *thread_count_ptr = op.final_thread_count();
1764 *stack_info_ptr = op.stack_info();
1765 err = op.result();
1766 return err;
1767 } /* end GetAllStackTraces */
1768
1769
1770 // thread_count - pre-checked to be greater than or equal to 0
1771 // thread_list - pre-checked for null
1772 // max_frame_count - pre-checked to be greater than or equal to 0
1773 // stack_info_ptr - pre-checked for null
1774 jvmtiError
1775 JvmtiEnv::GetThreadListStackTraces(jint thread_count, const jthread* thread_list, jint max_frame_count, jvmtiStackInfo** stack_info_ptr) {
1776 jvmtiError err = JVMTI_ERROR_NONE;
1777
1778 if (thread_count == 1) {
1779 JvmtiVTMSTransitionDisabler disabler;
1780
1781 // Use direct handshake if we need to get only one stack trace.
1782 JavaThread *current_thread = JavaThread::current();
1783 ThreadsListHandle tlh(current_thread);
1784
1785 jthread thread = thread_list[0];
1786 JavaThread *java_thread;
1787 oop thread_obj = nullptr;
1788 err = get_threadOop_and_JavaThread(tlh.list(), thread, &java_thread, &thread_obj);
1789 if (err != JVMTI_ERROR_NONE) {
1790 return err;
1791 }
1792
1793 if (java_lang_VirtualThread::is_instance(thread_obj) && java_thread == nullptr) {
1794 // Target virtual thread is unmounted.
1795 ResourceMark rm(current_thread);
1796 MultipleStackTracesCollector collector(this, max_frame_count);
1797 collector.fill_frames(thread, java_thread, thread_obj);
1798 collector.allocate_and_fill_stacks(/* thread_count */ 1);
1799 *stack_info_ptr = collector.stack_info();
1800 return collector.result();
1801 }
1802
1803 GetSingleStackTraceClosure op(this, current_thread, thread, max_frame_count);
1804 Handshake::execute(&op, &tlh, java_thread);
1805 err = op.result();
1806 if (err == JVMTI_ERROR_NONE) {
1807 *stack_info_ptr = op.stack_info();
1808 }
1809 } else {
1810 // JVMTI get stack traces at safepoint.
1811 VM_GetThreadListStackTraces op(this, thread_count, thread_list, max_frame_count);
1812 VMThread::execute(&op);
1813 err = op.result();
1814 if (err == JVMTI_ERROR_NONE) {
1815 *stack_info_ptr = op.stack_info();
1816 }
1817 }
1818 return err;
1819 } /* end GetThreadListStackTraces */
1820
1821
1822 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
1823 // count_ptr - pre-checked for null
1824 jvmtiError
1825 JvmtiEnv::GetFrameCount(jthread thread, jint* count_ptr) {
1826 JavaThread* current_thread = JavaThread::current();
1827 HandleMark hm(current_thread);
1828
1829 JvmtiVTMSTransitionDisabler disabler(thread);
1830 ThreadsListHandle tlh(current_thread);
1831
1832 JavaThread* java_thread = nullptr;
1833 oop thread_obj = nullptr;
1834 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, &java_thread, &thread_obj);
1835 if (err != JVMTI_ERROR_NONE) {
1836 return err;
1837 }
1838
1839 if (java_lang_VirtualThread::is_instance(thread_obj)) {
1840 if (java_thread == nullptr) { // Target virtual thread is unmounted.
1841 VM_VirtualThreadGetFrameCount op(this, Handle(current_thread, thread_obj), count_ptr);
1842 VMThread::execute(&op);
1843 return op.result();
1844 }
1845 VirtualThreadGetFrameCountClosure op(this, Handle(current_thread, thread_obj), count_ptr);
1846 Handshake::execute(&op, java_thread);
1847 return op.result();
1848 }
1849
1850 // It is only safe to perform the direct operation on the current
1851 // thread. All other usage needs to use a direct handshake for safety.
1852 if (java_thread == JavaThread::current()) {
1853 err = get_frame_count(java_thread, count_ptr);
1854 } else {
1855 // get java stack frame count with handshake.
1856 GetFrameCountClosure op(this, count_ptr);
1857 Handshake::execute(&op, java_thread);
1858 err = op.result();
1859 }
1860 return err;
1861 } /* end GetFrameCount */
1862
1863
1864 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
1865 jvmtiError
1866 JvmtiEnv::PopFrame(jthread thread) {
1867 JavaThread* current_thread = JavaThread::current();
1868 HandleMark hm(current_thread);
1869
1870 if (thread == nullptr) {
1871 return JVMTI_ERROR_INVALID_THREAD;
1872 }
1873 JvmtiVTMSTransitionDisabler disabler(thread);
1874 ThreadsListHandle tlh(current_thread);
1875
1876 JavaThread* java_thread = nullptr;
1877 oop thread_obj = nullptr;
1878 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, &java_thread, &thread_obj);
1879
1880 if (thread_obj != nullptr && thread_obj->is_a(vmClasses::BaseVirtualThread_klass())) {
1881 // No support for virtual threads (yet).
1882 return JVMTI_ERROR_OPAQUE_FRAME;
1883 }
1884 if (err != JVMTI_ERROR_NONE) {
1885 return err;
1886 }
1887
1888 // retrieve or create the state
1889 JvmtiThreadState* state = JvmtiThreadState::state_for(java_thread);
1890 if (state == nullptr) {
1891 return JVMTI_ERROR_THREAD_NOT_ALIVE;
1892 }
1893
1894 // Eagerly reallocate scalar replaced objects.
1895 EscapeBarrier eb(true, current_thread, java_thread);
1896 if (!eb.deoptimize_objects(1)) {
1897 // Reallocation of scalar replaced objects failed -> return with error
1898 return JVMTI_ERROR_OUT_OF_MEMORY;
1899 }
1900
1901 MutexLocker mu(JvmtiThreadState_lock);
1902 UpdateForPopTopFrameClosure op(state);
1903 if (java_thread == current_thread) {
1904 op.doit(java_thread, true /* self */);
1905 } else {
1906 Handshake::execute(&op, java_thread);
1907 }
1908 return op.result();
1909 } /* end PopFrame */
1910
1911
1912 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
1913 // depth - pre-checked as non-negative
1914 // method_ptr - pre-checked for null
1915 // location_ptr - pre-checked for null
1916 jvmtiError
1917 JvmtiEnv::GetFrameLocation(jthread thread, jint depth, jmethodID* method_ptr, jlocation* location_ptr) {
1918 JavaThread* current_thread = JavaThread::current();
1919 HandleMark hm(current_thread);
1920
1921 JvmtiVTMSTransitionDisabler disabler(thread);
1922 ThreadsListHandle tlh(current_thread);
1923
1924 JavaThread* java_thread = nullptr;
1925 oop thread_obj = nullptr;
1926 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, &java_thread, &thread_obj);
1927 if (err != JVMTI_ERROR_NONE) {
1928 return err;
1929 }
1930
1931 if (java_lang_VirtualThread::is_instance(thread_obj)) {
1932 if (java_thread == nullptr) { // Target virtual thread is unmounted.
1933 err = get_frame_location(thread_obj, depth, method_ptr, location_ptr);
1934 return err;
1935 }
1936 VirtualThreadGetFrameLocationClosure op(this, Handle(current_thread, thread_obj),
1937 depth, method_ptr, location_ptr);
1938 Handshake::execute(&op, java_thread);
1939 return op.result();
1940 }
1941
1942 // It is only safe to perform the direct operation on the current
1943 // thread. All other usage needs to use a direct handshake for safety.
1944 if (java_thread == JavaThread::current()) {
1945 err = get_frame_location(java_thread, depth, method_ptr, location_ptr);
1946 } else {
1947 // JVMTI get java stack frame location via direct handshake.
1948 GetFrameLocationClosure op(this, depth, method_ptr, location_ptr);
1949 Handshake::execute(&op, java_thread);
1950 err = op.result();
1951 }
1952 return err;
1953 } /* end GetFrameLocation */
1954
1955
1956 // Threads_lock NOT held, java_thread not protected by lock
1957 // depth - pre-checked as non-negative
1958 jvmtiError
1959 JvmtiEnv::NotifyFramePop(jthread thread, jint depth) {
1960 ResourceMark rm;
1961 JvmtiVTMSTransitionDisabler disabler(thread);
1962 ThreadsListHandle tlh;
1963
1964 JavaThread* java_thread = nullptr;
1965 oop thread_obj = nullptr;
1966 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, &java_thread, &thread_obj);
1967 if (err != JVMTI_ERROR_NONE) {
1968 return err;
1969 }
1970
1971 JavaThread* current = JavaThread::current();
1972 HandleMark hm(current);
1973 Handle thread_handle(current, thread_obj);
1974 JvmtiThreadState *state = JvmtiThreadState::state_for(java_thread, thread_handle);
1975 if (state == nullptr) {
1976 return JVMTI_ERROR_THREAD_NOT_ALIVE;
1977 }
1978
1979 if (java_lang_VirtualThread::is_instance(thread_handle())) {
1980 VirtualThreadSetFramePopClosure op(this, thread_handle, state, depth);
1981 MutexLocker mu(current, JvmtiThreadState_lock);
1982 if (java_thread == nullptr || java_thread == current) {
1983 // Target virtual thread is unmounted or current.
1984 op.doit(java_thread, true /* self */);
1985 } else {
1986 Handshake::execute(&op, java_thread);
1987 }
1988 return op.result();
1989 }
1990
1991 SetFramePopClosure op(this, state, depth);
1992 MutexLocker mu(current, JvmtiThreadState_lock);
1993 if (java_thread == current) {
1994 op.doit(java_thread, true /* self */);
1995 } else {
1996 Handshake::execute(&op, java_thread);
1997 }
1998 return op.result();
1999 } /* end NotifyFramePop */
2000
2001
2002 //
2003 // Force Early Return functions
2004 //
2005
2006 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
2007 jvmtiError
2008 JvmtiEnv::ForceEarlyReturnObject(jthread thread, jobject value) {
2009 jvalue val;
2010 val.l = value;
2011 return force_early_return(thread, val, atos);
2012 } /* end ForceEarlyReturnObject */
2013
2014
2015 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
2016 jvmtiError
2017 JvmtiEnv::ForceEarlyReturnInt(jthread thread, jint value) {
2018 jvalue val;
2019 val.i = value;
2020 return force_early_return(thread, val, itos);
2021 } /* end ForceEarlyReturnInt */
2022
2023
2024 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
2025 jvmtiError
2026 JvmtiEnv::ForceEarlyReturnLong(jthread thread, jlong value) {
2027 jvalue val;
2028 val.j = value;
2029 return force_early_return(thread, val, ltos);
2030 } /* end ForceEarlyReturnLong */
2031
2032
2033 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
2034 jvmtiError
2035 JvmtiEnv::ForceEarlyReturnFloat(jthread thread, jfloat value) {
2036 jvalue val;
2037 val.f = value;
2038 return force_early_return(thread, val, ftos);
2039 } /* end ForceEarlyReturnFloat */
2040
2041
2042 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
2043 jvmtiError
2044 JvmtiEnv::ForceEarlyReturnDouble(jthread thread, jdouble value) {
2045 jvalue val;
2046 val.d = value;
2047 return force_early_return(thread, val, dtos);
2048 } /* end ForceEarlyReturnDouble */
2049
2050
2051 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
2052 jvmtiError
2053 JvmtiEnv::ForceEarlyReturnVoid(jthread thread) {
2054 jvalue val;
2055 val.j = 0L;
2056 return force_early_return(thread, val, vtos);
2057 } /* end ForceEarlyReturnVoid */
2058
2059
2060 //
2061 // Heap functions
2062 //
2063
2064 // klass - null is a valid value, must be checked
2065 // initial_object - null is a valid value, must be checked
2066 // callbacks - pre-checked for null
2067 // user_data - null is a valid value, must be checked
2068 jvmtiError
2069 JvmtiEnv::FollowReferences(jint heap_filter, jclass klass, jobject initial_object, const jvmtiHeapCallbacks* callbacks, const void* user_data) {
2070 // check klass if provided
2071 Klass* k = nullptr;
2072 if (klass != nullptr) {
2073 oop k_mirror = JNIHandles::resolve_external_guard(klass);
2074 if (k_mirror == nullptr) {
2075 return JVMTI_ERROR_INVALID_CLASS;
2076 }
2077 if (java_lang_Class::is_primitive(k_mirror)) {
2078 return JVMTI_ERROR_NONE;
2079 }
2080 k = java_lang_Class::as_Klass(k_mirror);
2081 if (klass == nullptr) {
2082 return JVMTI_ERROR_INVALID_CLASS;
2083 }
2084 }
2085
2086 if (initial_object != nullptr) {
2087 oop init_obj = JNIHandles::resolve_external_guard(initial_object);
2088 if (init_obj == nullptr) {
2089 return JVMTI_ERROR_INVALID_OBJECT;
2090 }
2091 }
2092
2093 Thread *thread = Thread::current();
2094 HandleMark hm(thread);
2095
2096 TraceTime t("FollowReferences", TRACETIME_LOG(Debug, jvmti, objecttagging));
2097 JvmtiTagMap::tag_map_for(this)->follow_references(heap_filter, k, initial_object, callbacks, user_data);
2098 return JVMTI_ERROR_NONE;
2099 } /* end FollowReferences */
2100
2101
2102 // klass - null is a valid value, must be checked
2103 // callbacks - pre-checked for null
2104 // user_data - null is a valid value, must be checked
2105 jvmtiError
2106 JvmtiEnv::IterateThroughHeap(jint heap_filter, jclass klass, const jvmtiHeapCallbacks* callbacks, const void* user_data) {
2107 // check klass if provided
2108 Klass* k = nullptr;
2109 if (klass != nullptr) {
2110 oop k_mirror = JNIHandles::resolve_external_guard(klass);
2111 if (k_mirror == nullptr) {
2112 return JVMTI_ERROR_INVALID_CLASS;
2113 }
2114 if (java_lang_Class::is_primitive(k_mirror)) {
2115 return JVMTI_ERROR_NONE;
2116 }
2117 k = java_lang_Class::as_Klass(k_mirror);
2118 if (k == nullptr) {
2119 return JVMTI_ERROR_INVALID_CLASS;
2120 }
2121 }
2122
2123 TraceTime t("IterateThroughHeap", TRACETIME_LOG(Debug, jvmti, objecttagging));
2124 JvmtiTagMap::tag_map_for(this)->iterate_through_heap(heap_filter, k, callbacks, user_data);
2125 return JVMTI_ERROR_NONE;
2126 } /* end IterateThroughHeap */
2127
2128
2129 // tag_ptr - pre-checked for null
2130 jvmtiError
2131 JvmtiEnv::GetTag(jobject object, jlong* tag_ptr) {
2132 oop o = JNIHandles::resolve_external_guard(object);
2133 NULL_CHECK(o, JVMTI_ERROR_INVALID_OBJECT);
2134 *tag_ptr = JvmtiTagMap::tag_map_for(this)->get_tag(object);
2135 return JVMTI_ERROR_NONE;
2136 } /* end GetTag */
2137
2138
2139 jvmtiError
2140 JvmtiEnv::SetTag(jobject object, jlong tag) {
2141 oop o = JNIHandles::resolve_external_guard(object);
2142 NULL_CHECK(o, JVMTI_ERROR_INVALID_OBJECT);
2143 JvmtiTagMap::tag_map_for(this)->set_tag(object, tag);
2144 return JVMTI_ERROR_NONE;
2145 } /* end SetTag */
2146
2147
2148 // tag_count - pre-checked to be greater than or equal to 0
2149 // tags - pre-checked for null
2150 // count_ptr - pre-checked for null
2151 // object_result_ptr - null is a valid value, must be checked
2152 // tag_result_ptr - null is a valid value, must be checked
2153 jvmtiError
2154 JvmtiEnv::GetObjectsWithTags(jint tag_count, const jlong* tags, jint* count_ptr, jobject** object_result_ptr, jlong** tag_result_ptr) {
2155 TraceTime t("GetObjectsWithTags", TRACETIME_LOG(Debug, jvmti, objecttagging));
2156 return JvmtiTagMap::tag_map_for(this)->get_objects_with_tags((jlong*)tags, tag_count, count_ptr, object_result_ptr, tag_result_ptr);
2157 } /* end GetObjectsWithTags */
2158
2159
2160 jvmtiError
2161 JvmtiEnv::ForceGarbageCollection() {
2162 Universe::heap()->collect(GCCause::_jvmti_force_gc);
2163 return JVMTI_ERROR_NONE;
2164 } /* end ForceGarbageCollection */
2165
2166
2167 //
2168 // Heap (1.0) functions
2169 //
2170
2171 // object_reference_callback - pre-checked for null
2172 // user_data - null is a valid value, must be checked
2173 jvmtiError
2174 JvmtiEnv::IterateOverObjectsReachableFromObject(jobject object, jvmtiObjectReferenceCallback object_reference_callback, const void* user_data) {
2175 oop o = JNIHandles::resolve_external_guard(object);
2176 NULL_CHECK(o, JVMTI_ERROR_INVALID_OBJECT);
2177 JvmtiTagMap::tag_map_for(this)->iterate_over_objects_reachable_from_object(object, object_reference_callback, user_data);
2178 return JVMTI_ERROR_NONE;
2179 } /* end IterateOverObjectsReachableFromObject */
2180
2181
2182 // heap_root_callback - null is a valid value, must be checked
2183 // stack_ref_callback - null is a valid value, must be checked
2184 // object_ref_callback - null is a valid value, must be checked
2185 // user_data - null is a valid value, must be checked
2186 jvmtiError
2187 JvmtiEnv::IterateOverReachableObjects(jvmtiHeapRootCallback heap_root_callback, jvmtiStackReferenceCallback stack_ref_callback, jvmtiObjectReferenceCallback object_ref_callback, const void* user_data) {
2188 TraceTime t("IterateOverReachableObjects", TRACETIME_LOG(Debug, jvmti, objecttagging));
2189 JvmtiTagMap::tag_map_for(this)->iterate_over_reachable_objects(heap_root_callback, stack_ref_callback, object_ref_callback, user_data);
2190 return JVMTI_ERROR_NONE;
2191 } /* end IterateOverReachableObjects */
2192
2193
2194 // heap_object_callback - pre-checked for null
2195 // user_data - null is a valid value, must be checked
2196 jvmtiError
2197 JvmtiEnv::IterateOverHeap(jvmtiHeapObjectFilter object_filter, jvmtiHeapObjectCallback heap_object_callback, const void* user_data) {
2198 TraceTime t("IterateOverHeap", TRACETIME_LOG(Debug, jvmti, objecttagging));
2199 Thread *thread = Thread::current();
2200 HandleMark hm(thread);
2201 JvmtiTagMap::tag_map_for(this)->iterate_over_heap(object_filter, nullptr, heap_object_callback, user_data);
2202 return JVMTI_ERROR_NONE;
2203 } /* end IterateOverHeap */
2204
2205
2206 // k_mirror - may be primitive, this must be checked
2207 // heap_object_callback - pre-checked for null
2208 // user_data - null is a valid value, must be checked
2209 jvmtiError
2210 JvmtiEnv::IterateOverInstancesOfClass(oop k_mirror, jvmtiHeapObjectFilter object_filter, jvmtiHeapObjectCallback heap_object_callback, const void* user_data) {
2211 if (java_lang_Class::is_primitive(k_mirror)) {
2212 // DO PRIMITIVE CLASS PROCESSING
2213 return JVMTI_ERROR_NONE;
2214 }
2215 Klass* klass = java_lang_Class::as_Klass(k_mirror);
2216 if (klass == nullptr) {
2217 return JVMTI_ERROR_INVALID_CLASS;
2218 }
2219 TraceTime t("IterateOverInstancesOfClass", TRACETIME_LOG(Debug, jvmti, objecttagging));
2220 JvmtiTagMap::tag_map_for(this)->iterate_over_heap(object_filter, klass, heap_object_callback, user_data);
2221 return JVMTI_ERROR_NONE;
2222 } /* end IterateOverInstancesOfClass */
2223
2224
2225 //
2226 // Local Variable functions
2227 //
2228
2229 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
2230 // depth - pre-checked as non-negative
2231 // value_ptr - pre-checked for null
2232 jvmtiError
2233 JvmtiEnv::GetLocalObject(jthread thread, jint depth, jint slot, jobject* value_ptr) {
2234 JavaThread* current_thread = JavaThread::current();
2235 // rm object is created to clean up the javaVFrame created in
2236 // doit_prologue(), but after doit() is finished with it.
2237 ResourceMark rm(current_thread);
2238 HandleMark hm(current_thread);
2239 JvmtiVTMSTransitionDisabler disabler(thread);
2240 ThreadsListHandle tlh(current_thread);
2241
2242 JavaThread* java_thread = nullptr;
2243 oop thread_obj = nullptr;
2244 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, &java_thread, &thread_obj);
2245 if (err != JVMTI_ERROR_NONE) {
2246 return err;
2247 }
2248 bool self = is_JavaThread_current(java_thread, thread_obj);
2249
2250 if (java_lang_VirtualThread::is_instance(thread_obj)) {
2251 VM_VirtualThreadGetOrSetLocal op(this, Handle(current_thread, thread_obj),
2252 current_thread, depth, slot, self);
2253 VMThread::execute(&op);
2254 err = op.result();
2255 if (err == JVMTI_ERROR_NONE) {
2256 *value_ptr = op.value().l;
2257 }
2258 } else {
2259 // Support for ordinary threads
2260 VM_GetOrSetLocal op(java_thread, 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 }
2267 return err;
2268 } /* end GetLocalObject */
2269
2270 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
2271 // depth - pre-checked as non-negative
2272 // value - pre-checked for null
2273 jvmtiError
2274 JvmtiEnv::GetLocalInstance(jthread thread, jint depth, jobject* value_ptr){
2275 JavaThread* current_thread = JavaThread::current();
2276 // rm object is created to clean up the javaVFrame created in
2277 // doit_prologue(), but after doit() is finished with it.
2278 ResourceMark rm(current_thread);
2279 HandleMark hm(current_thread);
2280 JvmtiVTMSTransitionDisabler disabler(thread);
2281 ThreadsListHandle tlh(current_thread);
2282
2283 JavaThread* java_thread = nullptr;
2284 oop thread_obj = nullptr;
2285 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, &java_thread, &thread_obj);
2286 if (err != JVMTI_ERROR_NONE) {
2287 return err;
2288 }
2289 bool self = is_JavaThread_current(java_thread, thread_obj);
2290
2291 if (java_lang_VirtualThread::is_instance(thread_obj)) {
2292 VM_VirtualThreadGetReceiver op(this, Handle(current_thread, thread_obj),
2293 current_thread, depth, self);
2294 VMThread::execute(&op);
2295 err = op.result();
2296 if (err == JVMTI_ERROR_NONE) {
2297 *value_ptr = op.value().l;
2298 }
2299 } else {
2300 // Support for ordinary threads
2301 VM_GetReceiver op(java_thread, 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 }
2308 return err;
2309 } /* end GetLocalInstance */
2310
2311
2312 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
2313 // depth - pre-checked as non-negative
2314 // value_ptr - pre-checked for null
2315 jvmtiError
2316 JvmtiEnv::GetLocalInt(jthread thread, jint depth, jint slot, jint* value_ptr) {
2317 JavaThread* current_thread = JavaThread::current();
2318 // rm object is created to clean up the javaVFrame created in
2319 // doit_prologue(), but after doit() is finished with it.
2320 ResourceMark rm(current_thread);
2321 HandleMark hm(current_thread);
2322 JvmtiVTMSTransitionDisabler disabler(thread);
2323 ThreadsListHandle tlh(current_thread);
2324
2325 JavaThread* java_thread = nullptr;
2326 oop thread_obj = nullptr;
2327 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, &java_thread, &thread_obj);
2328 if (err != JVMTI_ERROR_NONE) {
2329 return err;
2330 }
2331 bool self = is_JavaThread_current(java_thread, thread_obj);
2332
2333 if (java_lang_VirtualThread::is_instance(thread_obj)) {
2334 VM_VirtualThreadGetOrSetLocal op(this, Handle(current_thread, thread_obj),
2335 depth, slot, T_INT, self);
2336 VMThread::execute(&op);
2337 err = op.result();
2338 if (err == JVMTI_ERROR_NONE) {
2339 *value_ptr = op.value().i;
2340 }
2341 } else {
2342 // Support for ordinary threads
2343 VM_GetOrSetLocal op(java_thread, 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 }
2350 return err;
2351 } /* end GetLocalInt */
2352
2353
2354 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
2355 // depth - pre-checked as non-negative
2356 // value_ptr - pre-checked for null
2357 jvmtiError
2358 JvmtiEnv::GetLocalLong(jthread thread, jint depth, jint slot, jlong* value_ptr) {
2359 JavaThread* current_thread = JavaThread::current();
2360 // rm object is created to clean up the javaVFrame created in
2361 // doit_prologue(), but after doit() is finished with it.
2362 ResourceMark rm(current_thread);
2363 HandleMark hm(current_thread);
2364 JvmtiVTMSTransitionDisabler disabler(thread);
2365 ThreadsListHandle tlh(current_thread);
2366
2367 JavaThread* java_thread = nullptr;
2368 oop thread_obj = nullptr;
2369 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, &java_thread, &thread_obj);
2370 if (err != JVMTI_ERROR_NONE) {
2371 return err;
2372 }
2373 bool self = is_JavaThread_current(java_thread, thread_obj);
2374
2375 if (java_lang_VirtualThread::is_instance(thread_obj)) {
2376 VM_VirtualThreadGetOrSetLocal op(this, Handle(current_thread, thread_obj),
2377 depth, slot, T_LONG, self);
2378 VMThread::execute(&op);
2379 err = op.result();
2380 if (err == JVMTI_ERROR_NONE) {
2381 *value_ptr = op.value().j;
2382 }
2383 } else {
2384 // Support for ordinary threads
2385 VM_GetOrSetLocal op(java_thread, 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 }
2392 return err;
2393 } /* end GetLocalLong */
2394
2395
2396 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
2397 // depth - pre-checked as non-negative
2398 // value_ptr - pre-checked for null
2399 jvmtiError
2400 JvmtiEnv::GetLocalFloat(jthread thread, jint depth, jint slot, jfloat* value_ptr) {
2401 JavaThread* current_thread = JavaThread::current();
2402 // rm object is created to clean up the javaVFrame created in
2403 // doit_prologue(), but after doit() is finished with it.
2404 ResourceMark rm(current_thread);
2405 HandleMark hm(current_thread);
2406 JvmtiVTMSTransitionDisabler disabler(thread);
2407 ThreadsListHandle tlh(current_thread);
2408
2409 JavaThread* java_thread = nullptr;
2410 oop thread_obj = nullptr;
2411 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, &java_thread, &thread_obj);
2412 if (err != JVMTI_ERROR_NONE) {
2413 return err;
2414 }
2415 bool self = is_JavaThread_current(java_thread, thread_obj);
2416
2417 if (java_lang_VirtualThread::is_instance(thread_obj)) {
2418 VM_VirtualThreadGetOrSetLocal op(this, Handle(current_thread, thread_obj),
2419 depth, slot, T_FLOAT, self);
2420 VMThread::execute(&op);
2421 err = op.result();
2422 if (err == JVMTI_ERROR_NONE) {
2423 *value_ptr = op.value().f;
2424 }
2425 } else {
2426 // Support for ordinary threads
2427 VM_GetOrSetLocal op(java_thread, 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 }
2434 return err;
2435 } /* end GetLocalFloat */
2436
2437
2438 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
2439 // depth - pre-checked as non-negative
2440 // value_ptr - pre-checked for null
2441 jvmtiError
2442 JvmtiEnv::GetLocalDouble(jthread thread, jint depth, jint slot, jdouble* value_ptr) {
2443 JavaThread* current_thread = JavaThread::current();
2444 // rm object is created to clean up the javaVFrame created in
2445 // doit_prologue(), but after doit() is finished with it.
2446 ResourceMark rm(current_thread);
2447 HandleMark hm(current_thread);
2448 JvmtiVTMSTransitionDisabler disabler(thread);
2449 ThreadsListHandle tlh(current_thread);
2450
2451 JavaThread* java_thread = nullptr;
2452 oop thread_obj = nullptr;
2453 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, &java_thread, &thread_obj);
2454 if (err != JVMTI_ERROR_NONE) {
2455 return err;
2456 }
2457 bool self = is_JavaThread_current(java_thread, thread_obj);
2458
2459 if (java_lang_VirtualThread::is_instance(thread_obj)) {
2460 VM_VirtualThreadGetOrSetLocal op(this, Handle(current_thread, thread_obj),
2461 depth, slot, T_DOUBLE, self);
2462 VMThread::execute(&op);
2463 err = op.result();
2464 if (err == JVMTI_ERROR_NONE) {
2465 *value_ptr = op.value().d;
2466 }
2467 } else {
2468 // Support for ordinary threads
2469 VM_GetOrSetLocal op(java_thread, 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 }
2476 return err;
2477 } /* end GetLocalDouble */
2478
2479
2480 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
2481 // depth - pre-checked as non-negative
2482 jvmtiError
2483 JvmtiEnv::SetLocalObject(jthread thread, jint depth, jint slot, jobject value) {
2484 JavaThread* current_thread = JavaThread::current();
2485 // rm object is created to clean up the javaVFrame created in
2486 // doit_prologue(), but after doit() is finished with it.
2487 ResourceMark rm(current_thread);
2488 HandleMark hm(current_thread);
2489 JvmtiVTMSTransitionDisabler disabler(thread);
2490 ThreadsListHandle tlh(current_thread);
2491
2492 JavaThread* java_thread = nullptr;
2493 oop thread_obj = nullptr;
2494 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, &java_thread, &thread_obj);
2495 if (err != JVMTI_ERROR_NONE) {
2496 return err;
2497 }
2498 bool self = is_JavaThread_current(java_thread, thread_obj);
2499 jvalue val;
2500 val.l = value;
2501
2502 if (java_lang_VirtualThread::is_instance(thread_obj)) {
2503 VM_VirtualThreadGetOrSetLocal op(this, Handle(current_thread, thread_obj),
2504 depth, slot, T_OBJECT, val, self);
2505 VMThread::execute(&op);
2506 err = op.result();
2507 } else {
2508 // Support for ordinary threads
2509 VM_GetOrSetLocal op(java_thread, depth, slot, T_OBJECT, val, self);
2510 VMThread::execute(&op);
2511 err = op.result();
2512 }
2513 return err;
2514 } /* end SetLocalObject */
2515
2516
2517 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
2518 // depth - pre-checked as non-negative
2519 jvmtiError
2520 JvmtiEnv::SetLocalInt(jthread thread, jint depth, jint slot, jint value) {
2521 JavaThread* current_thread = JavaThread::current();
2522 // rm object is created to clean up the javaVFrame created in
2523 // doit_prologue(), but after doit() is finished with it.
2524 ResourceMark rm(current_thread);
2525 HandleMark hm(current_thread);
2526 JvmtiVTMSTransitionDisabler disabler(thread);
2527 ThreadsListHandle tlh(current_thread);
2528
2529 JavaThread* java_thread = nullptr;
2530 oop thread_obj = nullptr;
2531 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, &java_thread, &thread_obj);
2532 if (err != JVMTI_ERROR_NONE) {
2533 return err;
2534 }
2535 bool self = is_JavaThread_current(java_thread, thread_obj);
2536 jvalue val;
2537 val.i = value;
2538
2539 if (java_lang_VirtualThread::is_instance(thread_obj)) {
2540 VM_VirtualThreadGetOrSetLocal op(this, Handle(current_thread, thread_obj),
2541 depth, slot, T_INT, val, self);
2542 VMThread::execute(&op);
2543 err = op.result();
2544 } else {
2545 // Support for ordinary threads
2546 VM_GetOrSetLocal op(java_thread, depth, slot, T_INT, val, self);
2547 VMThread::execute(&op);
2548 err = op.result();
2549 }
2550 return err;
2551 } /* end SetLocalInt */
2552
2553
2554 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
2555 // depth - pre-checked as non-negative
2556 jvmtiError
2557 JvmtiEnv::SetLocalLong(jthread thread, jint depth, jint slot, jlong value) {
2558 JavaThread* current_thread = JavaThread::current();
2559 // rm object is created to clean up the javaVFrame created in
2560 // doit_prologue(), but after doit() is finished with it.
2561 ResourceMark rm(current_thread);
2562 HandleMark hm(current_thread);
2563 JvmtiVTMSTransitionDisabler disabler(thread);
2564 ThreadsListHandle tlh(current_thread);
2565
2566 JavaThread* java_thread = nullptr;
2567 oop thread_obj = nullptr;
2568 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, &java_thread, &thread_obj);
2569 if (err != JVMTI_ERROR_NONE) {
2570 return err;
2571 }
2572 bool self = is_JavaThread_current(java_thread, thread_obj);
2573 jvalue val;
2574 val.j = value;
2575
2576 if (java_lang_VirtualThread::is_instance(thread_obj)) {
2577 VM_VirtualThreadGetOrSetLocal op(this, Handle(current_thread, thread_obj),
2578 depth, slot, T_LONG, val, self);
2579 VMThread::execute(&op);
2580 err = op.result();
2581 } else {
2582 // Support for ordinary threads
2583 VM_GetOrSetLocal op(java_thread, depth, slot, T_LONG, val, self);
2584 VMThread::execute(&op);
2585 err = op.result();
2586 }
2587 return err;
2588 } /* end SetLocalLong */
2589
2590
2591 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
2592 // depth - pre-checked as non-negative
2593 jvmtiError
2594 JvmtiEnv::SetLocalFloat(jthread thread, jint depth, jint slot, jfloat value) {
2595 JavaThread* current_thread = JavaThread::current();
2596 // rm object is created to clean up the javaVFrame created in
2597 // doit_prologue(), but after doit() is finished with it.
2598 ResourceMark rm(current_thread);
2599 HandleMark hm(current_thread);
2600 JvmtiVTMSTransitionDisabler disabler(thread);
2601 ThreadsListHandle tlh(current_thread);
2602
2603 JavaThread* java_thread = nullptr;
2604 oop thread_obj = nullptr;
2605 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, &java_thread, &thread_obj);
2606 if (err != JVMTI_ERROR_NONE) {
2607 return err;
2608 }
2609 bool self = is_JavaThread_current(java_thread, thread_obj);
2610 jvalue val;
2611 val.f = value;
2612
2613 if (java_lang_VirtualThread::is_instance(thread_obj)) {
2614 VM_VirtualThreadGetOrSetLocal op(this, Handle(current_thread, thread_obj),
2615 depth, slot, T_FLOAT, val, self);
2616 VMThread::execute(&op);
2617 err = op.result();
2618 } else {
2619 // Support for ordinary threads
2620 VM_GetOrSetLocal op(java_thread, depth, slot, T_FLOAT, val, self);
2621 VMThread::execute(&op);
2622 err = op.result();
2623 }
2624 return err;
2625 } /* end SetLocalFloat */
2626
2627
2628 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
2629 // depth - pre-checked as non-negative
2630 jvmtiError
2631 JvmtiEnv::SetLocalDouble(jthread thread, jint depth, jint slot, jdouble value) {
2632 JavaThread* current_thread = JavaThread::current();
2633 // rm object is created to clean up the javaVFrame created in
2634 // doit_prologue(), but after doit() is finished with it.
2635 ResourceMark rm(current_thread);
2636 HandleMark hm(current_thread);
2637 JvmtiVTMSTransitionDisabler disabler(thread);
2638 ThreadsListHandle tlh(current_thread);
2639
2640 JavaThread* java_thread = nullptr;
2641 oop thread_obj = nullptr;
2642 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, &java_thread, &thread_obj);
2643 if (err != JVMTI_ERROR_NONE) {
2644 return err;
2645 }
2646 bool self = is_JavaThread_current(java_thread, thread_obj);
2647 jvalue val;
2648 val.d = value;
2649
2650 if (java_lang_VirtualThread::is_instance(thread_obj)) {
2651 VM_VirtualThreadGetOrSetLocal op(this, Handle(current_thread, thread_obj),
2652 depth, slot, T_DOUBLE, val, self);
2653 VMThread::execute(&op);
2654 err = op.result();
2655 } else {
2656 // Support for ordinary threads
2657 VM_GetOrSetLocal op(java_thread, depth, slot, T_DOUBLE, val, self);
2658 VMThread::execute(&op);
2659 err = op.result();
2660 }
2661 return err;
2662 } /* end SetLocalDouble */
2663
2664
2665 //
2666 // Breakpoint functions
2667 //
2668
2669 // method - pre-checked for validity, but may be null meaning obsolete method
2670 jvmtiError
2671 JvmtiEnv::SetBreakpoint(Method* method, jlocation location) {
2672 NULL_CHECK(method, JVMTI_ERROR_INVALID_METHODID);
2673 if (location < 0) { // simple invalid location check first
2674 return JVMTI_ERROR_INVALID_LOCATION;
2675 }
2676 // verify that the breakpoint is not past the end of the method
2677 if (location >= (jlocation) method->code_size()) {
2678 return JVMTI_ERROR_INVALID_LOCATION;
2679 }
2680
2681 ResourceMark rm;
2682 JvmtiBreakpoint bp(method, location);
2683 JvmtiBreakpoints& jvmti_breakpoints = JvmtiCurrentBreakpoints::get_jvmti_breakpoints();
2684 if (jvmti_breakpoints.set(bp) == JVMTI_ERROR_DUPLICATE)
2685 return JVMTI_ERROR_DUPLICATE;
2686
2687 if (TraceJVMTICalls) {
2688 jvmti_breakpoints.print();
2689 }
2690
2691 return JVMTI_ERROR_NONE;
2692 } /* end SetBreakpoint */
2693
2694
2695 // method - pre-checked for validity, but may be null meaning obsolete method
2696 jvmtiError
2697 JvmtiEnv::ClearBreakpoint(Method* method, jlocation location) {
2698 NULL_CHECK(method, JVMTI_ERROR_INVALID_METHODID);
2699
2700 if (location < 0) { // simple invalid location check first
2701 return JVMTI_ERROR_INVALID_LOCATION;
2702 }
2703
2704 // verify that the breakpoint is not past the end of the method
2705 if (location >= (jlocation) method->code_size()) {
2706 return JVMTI_ERROR_INVALID_LOCATION;
2707 }
2708
2709 JvmtiBreakpoint bp(method, location);
2710
2711 JvmtiBreakpoints& jvmti_breakpoints = JvmtiCurrentBreakpoints::get_jvmti_breakpoints();
2712 if (jvmti_breakpoints.clear(bp) == JVMTI_ERROR_NOT_FOUND)
2713 return JVMTI_ERROR_NOT_FOUND;
2714
2715 if (TraceJVMTICalls) {
2716 jvmti_breakpoints.print();
2717 }
2718
2719 return JVMTI_ERROR_NONE;
2720 } /* end ClearBreakpoint */
2721
2722
2723 //
2724 // Watched Field functions
2725 //
2726
2727 jvmtiError
2728 JvmtiEnv::SetFieldAccessWatch(fieldDescriptor* fdesc_ptr) {
2729 // make sure we haven't set this watch before
2730 if (fdesc_ptr->is_field_access_watched()) return JVMTI_ERROR_DUPLICATE;
2731 fdesc_ptr->set_is_field_access_watched(true);
2732
2733 JvmtiEventController::change_field_watch(JVMTI_EVENT_FIELD_ACCESS, true);
2734
2735 return JVMTI_ERROR_NONE;
2736 } /* end SetFieldAccessWatch */
2737
2738
2739 jvmtiError
2740 JvmtiEnv::ClearFieldAccessWatch(fieldDescriptor* fdesc_ptr) {
2741 // make sure we have a watch to clear
2742 if (!fdesc_ptr->is_field_access_watched()) return JVMTI_ERROR_NOT_FOUND;
2743 fdesc_ptr->set_is_field_access_watched(false);
2744
2745 JvmtiEventController::change_field_watch(JVMTI_EVENT_FIELD_ACCESS, false);
2746
2747 return JVMTI_ERROR_NONE;
2748 } /* end ClearFieldAccessWatch */
2749
2750
2751 jvmtiError
2752 JvmtiEnv::SetFieldModificationWatch(fieldDescriptor* fdesc_ptr) {
2753 // make sure we haven't set this watch before
2754 if (fdesc_ptr->is_field_modification_watched()) return JVMTI_ERROR_DUPLICATE;
2755 fdesc_ptr->set_is_field_modification_watched(true);
2756
2757 JvmtiEventController::change_field_watch(JVMTI_EVENT_FIELD_MODIFICATION, true);
2758
2759 return JVMTI_ERROR_NONE;
2760 } /* end SetFieldModificationWatch */
2761
2762
2763 jvmtiError
2764 JvmtiEnv::ClearFieldModificationWatch(fieldDescriptor* fdesc_ptr) {
2765 // make sure we have a watch to clear
2766 if (!fdesc_ptr->is_field_modification_watched()) return JVMTI_ERROR_NOT_FOUND;
2767 fdesc_ptr->set_is_field_modification_watched(false);
2768
2769 JvmtiEventController::change_field_watch(JVMTI_EVENT_FIELD_MODIFICATION, false);
2770
2771 return JVMTI_ERROR_NONE;
2772 } /* end ClearFieldModificationWatch */
2773
2774 //
2775 // Class functions
2776 //
2777
2778
2779 // k_mirror - may be primitive, this must be checked
2780 // signature_ptr - null is a valid value, must be checked
2781 // generic_ptr - null is a valid value, must be checked
2782 jvmtiError
2783 JvmtiEnv::GetClassSignature(oop k_mirror, char** signature_ptr, char** generic_ptr) {
2784 ResourceMark rm;
2785 bool isPrimitive = java_lang_Class::is_primitive(k_mirror);
2786 Klass* k = nullptr;
2787 if (!isPrimitive) {
2788 k = java_lang_Class::as_Klass(k_mirror);
2789 NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS);
2790 }
2791 if (signature_ptr != nullptr) {
2792 char* result = nullptr;
2793 if (isPrimitive) {
2794 char tchar = type2char(java_lang_Class::primitive_type(k_mirror));
2795 result = (char*) jvmtiMalloc(2);
2796 result[0] = tchar;
2797 result[1] = '\0';
2798 } else {
2799 const char* class_sig = k->signature_name();
2800 result = (char *) jvmtiMalloc(strlen(class_sig)+1);
2801 strcpy(result, class_sig);
2802 }
2803 *signature_ptr = result;
2804 }
2805 if (generic_ptr != nullptr) {
2806 *generic_ptr = nullptr;
2807 if (!isPrimitive && k->is_instance_klass()) {
2808 Symbol* soo = InstanceKlass::cast(k)->generic_signature();
2809 if (soo != nullptr) {
2810 const char *gen_sig = soo->as_C_string();
2811 if (gen_sig != nullptr) {
2812 char* gen_result;
2813 jvmtiError err = allocate(strlen(gen_sig) + 1,
2814 (unsigned char **)&gen_result);
2815 if (err != JVMTI_ERROR_NONE) {
2816 return err;
2817 }
2818 strcpy(gen_result, gen_sig);
2819 *generic_ptr = gen_result;
2820 }
2821 }
2822 }
2823 }
2824 return JVMTI_ERROR_NONE;
2825 } /* end GetClassSignature */
2826
2827
2828 // k_mirror - may be primitive, this must be checked
2829 // status_ptr - pre-checked for null
2830 jvmtiError
2831 JvmtiEnv::GetClassStatus(oop k_mirror, jint* status_ptr) {
2832 jint result = 0;
2833 if (java_lang_Class::is_primitive(k_mirror)) {
2834 result |= JVMTI_CLASS_STATUS_PRIMITIVE;
2835 } else {
2836 Klass* k = java_lang_Class::as_Klass(k_mirror);
2837 NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS);
2838 result = k->jvmti_class_status();
2839 }
2840 *status_ptr = result;
2841
2842 return JVMTI_ERROR_NONE;
2843 } /* end GetClassStatus */
2844
2845
2846 // k_mirror - may be primitive, this must be checked
2847 // source_name_ptr - pre-checked for null
2848 jvmtiError
2849 JvmtiEnv::GetSourceFileName(oop k_mirror, char** source_name_ptr) {
2850 if (java_lang_Class::is_primitive(k_mirror)) {
2851 return JVMTI_ERROR_ABSENT_INFORMATION;
2852 }
2853 Klass* k_klass = java_lang_Class::as_Klass(k_mirror);
2854 NULL_CHECK(k_klass, JVMTI_ERROR_INVALID_CLASS);
2855
2856 if (!k_klass->is_instance_klass()) {
2857 return JVMTI_ERROR_ABSENT_INFORMATION;
2858 }
2859
2860 Symbol* sfnOop = InstanceKlass::cast(k_klass)->source_file_name();
2861 NULL_CHECK(sfnOop, JVMTI_ERROR_ABSENT_INFORMATION);
2862 {
2863 JavaThread* current_thread = JavaThread::current();
2864 ResourceMark rm(current_thread);
2865 const char* sfncp = (const char*) sfnOop->as_C_string();
2866 *source_name_ptr = (char *) jvmtiMalloc(strlen(sfncp)+1);
2867 strcpy(*source_name_ptr, sfncp);
2868 }
2869
2870 return JVMTI_ERROR_NONE;
2871 } /* end GetSourceFileName */
2872
2873
2874 // k_mirror - may be primitive, this must be checked
2875 // modifiers_ptr - pre-checked for null
2876 jvmtiError
2877 JvmtiEnv::GetClassModifiers(oop k_mirror, jint* modifiers_ptr) {
2878 JavaThread* current_thread = JavaThread::current();
2879 jint result = 0;
2880 if (!java_lang_Class::is_primitive(k_mirror)) {
2881 Klass* k = java_lang_Class::as_Klass(k_mirror);
2882 NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS);
2883 result = k->compute_modifier_flags();
2884
2885 // Reset the deleted ACC_SUPER bit (deleted in compute_modifier_flags()).
2886 if (k->is_super()) {
2887 result |= JVM_ACC_SUPER;
2888 }
2889 } else {
2890 result = (JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC);
2891 }
2892 *modifiers_ptr = result;
2893
2894 return JVMTI_ERROR_NONE;
2895 } /* end GetClassModifiers */
2896
2897
2898 // k_mirror - may be primitive, this must be checked
2899 // method_count_ptr - pre-checked for null
2900 // methods_ptr - pre-checked for null
2901 jvmtiError
2902 JvmtiEnv::GetClassMethods(oop k_mirror, jint* method_count_ptr, jmethodID** methods_ptr) {
2903 JavaThread* current_thread = JavaThread::current();
2904 HandleMark hm(current_thread);
2905
2906 if (java_lang_Class::is_primitive(k_mirror)) {
2907 *method_count_ptr = 0;
2908 *methods_ptr = (jmethodID*) jvmtiMalloc(0 * sizeof(jmethodID));
2909 return JVMTI_ERROR_NONE;
2910 }
2911 Klass* k = java_lang_Class::as_Klass(k_mirror);
2912 NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS);
2913
2914 // Return CLASS_NOT_PREPARED error as per JVMTI spec.
2915 if (!(k->jvmti_class_status() & (JVMTI_CLASS_STATUS_PREPARED|JVMTI_CLASS_STATUS_ARRAY) )) {
2916 return JVMTI_ERROR_CLASS_NOT_PREPARED;
2917 }
2918
2919 if (!k->is_instance_klass()) {
2920 *method_count_ptr = 0;
2921 *methods_ptr = (jmethodID*) jvmtiMalloc(0 * sizeof(jmethodID));
2922 return JVMTI_ERROR_NONE;
2923 }
2924 InstanceKlass* ik = InstanceKlass::cast(k);
2925 // Allocate the result and fill it in
2926 int result_length = ik->methods()->length();
2927 jmethodID* result_list = (jmethodID*)jvmtiMalloc(result_length * sizeof(jmethodID));
2928 int index;
2929 bool jmethodids_found = true;
2930 int skipped = 0; // skip overpass methods
2931
2932 for (index = 0; index < result_length; index++) {
2933 Method* m = ik->methods()->at(index);
2934 // Depending on can_maintain_original_method_order capability use the original
2935 // method ordering indices stored in the class, so we can emit jmethodIDs in
2936 // the order they appeared in the class file or just copy in current order.
2937 int result_index = JvmtiExport::can_maintain_original_method_order() ? ik->method_ordering()->at(index) : index;
2938 assert(result_index >= 0 && result_index < result_length, "invalid original method index");
2939 if (m->is_overpass()) {
2940 result_list[result_index] = nullptr;
2941 skipped++;
2942 continue;
2943 }
2944 jmethodID id;
2945 if (jmethodids_found) {
2946 id = m->find_jmethod_id_or_null();
2947 if (id == nullptr) {
2948 // If we find an uninitialized value, make sure there is
2949 // enough space for all the uninitialized values we might
2950 // find.
2951 ik->ensure_space_for_methodids(index);
2952 jmethodids_found = false;
2953 id = m->jmethod_id();
2954 }
2955 } else {
2956 id = m->jmethod_id();
2957 }
2958 result_list[result_index] = id;
2959 }
2960
2961 // Fill in return value.
2962 if (skipped > 0) {
2963 // copy results skipping null methodIDs
2964 *methods_ptr = (jmethodID*)jvmtiMalloc((result_length - skipped) * sizeof(jmethodID));
2965 *method_count_ptr = result_length - skipped;
2966 for (index = 0, skipped = 0; index < result_length; index++) {
2967 if (result_list[index] == nullptr) {
2968 skipped++;
2969 } else {
2970 (*methods_ptr)[index - skipped] = result_list[index];
2971 }
2972 }
2973 deallocate((unsigned char *)result_list);
2974 } else {
2975 *method_count_ptr = result_length;
2976 *methods_ptr = result_list;
2977 }
2978
2979 return JVMTI_ERROR_NONE;
2980 } /* end GetClassMethods */
2981
2982
2983 // k_mirror - may be primitive, this must be checked
2984 // field_count_ptr - pre-checked for null
2985 // fields_ptr - pre-checked for null
2986 jvmtiError
2987 JvmtiEnv::GetClassFields(oop k_mirror, jint* field_count_ptr, jfieldID** fields_ptr) {
2988 if (java_lang_Class::is_primitive(k_mirror)) {
2989 *field_count_ptr = 0;
2990 *fields_ptr = (jfieldID*) jvmtiMalloc(0 * sizeof(jfieldID));
2991 return JVMTI_ERROR_NONE;
2992 }
2993 JavaThread* current_thread = JavaThread::current();
2994 HandleMark hm(current_thread);
2995 Klass* k = java_lang_Class::as_Klass(k_mirror);
2996 NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS);
2997
2998 // Return CLASS_NOT_PREPARED error as per JVMTI spec.
2999 if (!(k->jvmti_class_status() & (JVMTI_CLASS_STATUS_PREPARED|JVMTI_CLASS_STATUS_ARRAY) )) {
3000 return JVMTI_ERROR_CLASS_NOT_PREPARED;
3001 }
3002
3003 if (!k->is_instance_klass()) {
3004 *field_count_ptr = 0;
3005 *fields_ptr = (jfieldID*) jvmtiMalloc(0 * sizeof(jfieldID));
3006 return JVMTI_ERROR_NONE;
3007 }
3008
3009
3010 InstanceKlass* ik = InstanceKlass::cast(k);
3011
3012 int result_count = 0;
3013 // First, count the fields.
3014 FilteredFieldStream flds(ik, true, true);
3015 result_count = flds.field_count();
3016
3017 // Allocate the result and fill it in
3018 jfieldID* result_list = (jfieldID*) jvmtiMalloc(result_count * sizeof(jfieldID));
3019 // The JVMTI spec requires fields in the order they occur in the class file,
3020 // this is the reverse order of what FieldStream hands out.
3021 int id_index = (result_count - 1);
3022
3023 for (FilteredFieldStream src_st(ik, true, true); !src_st.eos(); src_st.next()) {
3024 result_list[id_index--] = jfieldIDWorkaround::to_jfieldID(
3025 ik, src_st.offset(),
3026 src_st.access_flags().is_static());
3027 }
3028 assert(id_index == -1, "just checking");
3029 // Fill in the results
3030 *field_count_ptr = result_count;
3031 *fields_ptr = result_list;
3032
3033 return JVMTI_ERROR_NONE;
3034 } /* end GetClassFields */
3035
3036
3037 // k_mirror - may be primitive, this must be checked
3038 // interface_count_ptr - pre-checked for null
3039 // interfaces_ptr - pre-checked for null
3040 jvmtiError
3041 JvmtiEnv::GetImplementedInterfaces(oop k_mirror, jint* interface_count_ptr, jclass** interfaces_ptr) {
3042 {
3043 if (java_lang_Class::is_primitive(k_mirror)) {
3044 *interface_count_ptr = 0;
3045 *interfaces_ptr = (jclass*) jvmtiMalloc(0 * sizeof(jclass));
3046 return JVMTI_ERROR_NONE;
3047 }
3048 JavaThread* current_thread = JavaThread::current();
3049 HandleMark hm(current_thread);
3050 Klass* k = java_lang_Class::as_Klass(k_mirror);
3051 NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS);
3052
3053 // Return CLASS_NOT_PREPARED error as per JVMTI spec.
3054 if (!(k->jvmti_class_status() & (JVMTI_CLASS_STATUS_PREPARED|JVMTI_CLASS_STATUS_ARRAY) ))
3055 return JVMTI_ERROR_CLASS_NOT_PREPARED;
3056
3057 if (!k->is_instance_klass()) {
3058 *interface_count_ptr = 0;
3059 *interfaces_ptr = (jclass*) jvmtiMalloc(0 * sizeof(jclass));
3060 return JVMTI_ERROR_NONE;
3061 }
3062
3063 Array<InstanceKlass*>* interface_list = InstanceKlass::cast(k)->local_interfaces();
3064 const int result_length = (interface_list == nullptr ? 0 : interface_list->length());
3065 jclass* result_list = (jclass*) jvmtiMalloc(result_length * sizeof(jclass));
3066 for (int i_index = 0; i_index < result_length; i_index += 1) {
3067 InstanceKlass* klass_at = interface_list->at(i_index);
3068 assert(klass_at->is_klass(), "interfaces must be Klass*s");
3069 assert(klass_at->is_interface(), "interfaces must be interfaces");
3070 oop mirror_at = klass_at->java_mirror();
3071 Handle handle_at = Handle(current_thread, mirror_at);
3072 result_list[i_index] = (jclass) jni_reference(handle_at);
3073 }
3074 *interface_count_ptr = result_length;
3075 *interfaces_ptr = result_list;
3076 }
3077
3078 return JVMTI_ERROR_NONE;
3079 } /* end GetImplementedInterfaces */
3080
3081
3082 // k_mirror - may be primitive, this must be checked
3083 // minor_version_ptr - pre-checked for null
3084 // major_version_ptr - pre-checked for null
3085 jvmtiError
3086 JvmtiEnv::GetClassVersionNumbers(oop k_mirror, jint* minor_version_ptr, jint* major_version_ptr) {
3087 if (java_lang_Class::is_primitive(k_mirror)) {
3088 return JVMTI_ERROR_ABSENT_INFORMATION;
3089 }
3090 Klass* klass = java_lang_Class::as_Klass(k_mirror);
3091
3092 jint status = klass->jvmti_class_status();
3093 if (status & (JVMTI_CLASS_STATUS_ERROR)) {
3094 return JVMTI_ERROR_INVALID_CLASS;
3095 }
3096 if (status & (JVMTI_CLASS_STATUS_ARRAY)) {
3097 return JVMTI_ERROR_ABSENT_INFORMATION;
3098 }
3099
3100 InstanceKlass* ik = InstanceKlass::cast(klass);
3101 *minor_version_ptr = ik->minor_version();
3102 *major_version_ptr = ik->major_version();
3103
3104 return JVMTI_ERROR_NONE;
3105 } /* end GetClassVersionNumbers */
3106
3107
3108 // k_mirror - may be primitive, this must be checked
3109 // constant_pool_count_ptr - pre-checked for null
3110 // constant_pool_byte_count_ptr - pre-checked for null
3111 // constant_pool_bytes_ptr - pre-checked for null
3112 jvmtiError
3113 JvmtiEnv::GetConstantPool(oop k_mirror, jint* constant_pool_count_ptr, jint* constant_pool_byte_count_ptr, unsigned char** constant_pool_bytes_ptr) {
3114 if (java_lang_Class::is_primitive(k_mirror)) {
3115 return JVMTI_ERROR_ABSENT_INFORMATION;
3116 }
3117
3118 Klass* klass = java_lang_Class::as_Klass(k_mirror);
3119 Thread *thread = Thread::current();
3120 ResourceMark rm(thread);
3121
3122 jint status = klass->jvmti_class_status();
3123 if (status & (JVMTI_CLASS_STATUS_ERROR)) {
3124 return JVMTI_ERROR_INVALID_CLASS;
3125 }
3126 if (status & (JVMTI_CLASS_STATUS_ARRAY)) {
3127 return JVMTI_ERROR_ABSENT_INFORMATION;
3128 }
3129
3130 InstanceKlass* ik = InstanceKlass::cast(klass);
3131 JvmtiConstantPoolReconstituter reconstituter(ik);
3132 if (reconstituter.get_error() != JVMTI_ERROR_NONE) {
3133 return reconstituter.get_error();
3134 }
3135
3136 unsigned char *cpool_bytes;
3137 int cpool_size = reconstituter.cpool_size();
3138 if (reconstituter.get_error() != JVMTI_ERROR_NONE) {
3139 return reconstituter.get_error();
3140 }
3141 jvmtiError res = allocate(cpool_size, &cpool_bytes);
3142 if (res != JVMTI_ERROR_NONE) {
3143 return res;
3144 }
3145 reconstituter.copy_cpool_bytes(cpool_bytes);
3146 if (reconstituter.get_error() != JVMTI_ERROR_NONE) {
3147 return reconstituter.get_error();
3148 }
3149
3150 constantPoolHandle constants(thread, ik->constants());
3151 *constant_pool_count_ptr = constants->length();
3152 *constant_pool_byte_count_ptr = cpool_size;
3153 *constant_pool_bytes_ptr = cpool_bytes;
3154
3155 return JVMTI_ERROR_NONE;
3156 } /* end GetConstantPool */
3157
3158
3159 // k_mirror - may be primitive, this must be checked
3160 // is_interface_ptr - pre-checked for null
3161 jvmtiError
3162 JvmtiEnv::IsInterface(oop k_mirror, jboolean* is_interface_ptr) {
3163 {
3164 bool result = false;
3165 if (!java_lang_Class::is_primitive(k_mirror)) {
3166 Klass* k = java_lang_Class::as_Klass(k_mirror);
3167 if (k != nullptr && k->is_interface()) {
3168 result = true;
3169 }
3170 }
3171 *is_interface_ptr = result;
3172 }
3173
3174 return JVMTI_ERROR_NONE;
3175 } /* end IsInterface */
3176
3177
3178 // k_mirror - may be primitive, this must be checked
3179 // is_array_class_ptr - pre-checked for null
3180 jvmtiError
3181 JvmtiEnv::IsArrayClass(oop k_mirror, jboolean* is_array_class_ptr) {
3182 {
3183 bool result = false;
3184 if (!java_lang_Class::is_primitive(k_mirror)) {
3185 Klass* k = java_lang_Class::as_Klass(k_mirror);
3186 if (k != nullptr && k->is_array_klass()) {
3187 result = true;
3188 }
3189 }
3190 *is_array_class_ptr = result;
3191 }
3192
3193 return JVMTI_ERROR_NONE;
3194 } /* end IsArrayClass */
3195
3196
3197 // k_mirror - may be primitive, this must be checked
3198 // classloader_ptr - pre-checked for null
3199 jvmtiError
3200 JvmtiEnv::GetClassLoader(oop k_mirror, jobject* classloader_ptr) {
3201 {
3202 if (java_lang_Class::is_primitive(k_mirror)) {
3203 *classloader_ptr = (jclass) jni_reference(Handle());
3204 return JVMTI_ERROR_NONE;
3205 }
3206 JavaThread* current_thread = JavaThread::current();
3207 HandleMark hm(current_thread);
3208 Klass* k = java_lang_Class::as_Klass(k_mirror);
3209 NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS);
3210
3211 oop result_oop = k->class_loader();
3212 if (result_oop == nullptr) {
3213 *classloader_ptr = (jclass) jni_reference(Handle());
3214 return JVMTI_ERROR_NONE;
3215 }
3216 Handle result_handle = Handle(current_thread, result_oop);
3217 jclass result_jnihandle = (jclass) jni_reference(result_handle);
3218 *classloader_ptr = result_jnihandle;
3219 }
3220 return JVMTI_ERROR_NONE;
3221 } /* end GetClassLoader */
3222
3223
3224 // k_mirror - may be primitive, this must be checked
3225 // source_debug_extension_ptr - pre-checked for null
3226 jvmtiError
3227 JvmtiEnv::GetSourceDebugExtension(oop k_mirror, char** source_debug_extension_ptr) {
3228 {
3229 if (java_lang_Class::is_primitive(k_mirror)) {
3230 return JVMTI_ERROR_ABSENT_INFORMATION;
3231 }
3232 Klass* k = java_lang_Class::as_Klass(k_mirror);
3233 NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS);
3234 if (!k->is_instance_klass()) {
3235 return JVMTI_ERROR_ABSENT_INFORMATION;
3236 }
3237 const char* sde = InstanceKlass::cast(k)->source_debug_extension();
3238 NULL_CHECK(sde, JVMTI_ERROR_ABSENT_INFORMATION);
3239
3240 {
3241 *source_debug_extension_ptr = (char *) jvmtiMalloc(strlen(sde)+1);
3242 strcpy(*source_debug_extension_ptr, sde);
3243 }
3244 }
3245
3246 return JVMTI_ERROR_NONE;
3247 } /* end GetSourceDebugExtension */
3248
3249 //
3250 // Object functions
3251 //
3252
3253 // hash_code_ptr - pre-checked for null
3254 jvmtiError
3255 JvmtiEnv::GetObjectHashCode(jobject object, jint* hash_code_ptr) {
3256 oop mirror = JNIHandles::resolve_external_guard(object);
3257 NULL_CHECK(mirror, JVMTI_ERROR_INVALID_OBJECT);
3258 NULL_CHECK(hash_code_ptr, JVMTI_ERROR_NULL_POINTER);
3259
3260 {
3261 jint result = (jint) mirror->identity_hash();
3262 *hash_code_ptr = result;
3263 }
3264 return JVMTI_ERROR_NONE;
3265 } /* end GetObjectHashCode */
3266
3267
3268 // info_ptr - pre-checked for null
3269 jvmtiError
3270 JvmtiEnv::GetObjectMonitorUsage(jobject object, jvmtiMonitorUsage* info_ptr) {
3271 // This needs to be performed at a safepoint to gather stable data
3272 // because monitor owner / waiters might not be suspended.
3273 VM_GetObjectMonitorUsage op(this, JavaThread::current(), object, info_ptr);
3274 VMThread::execute(&op);
3275 return op.result();
3276 } /* end GetObjectMonitorUsage */
3277
3278
3279 //
3280 // Field functions
3281 //
3282
3283 // name_ptr - null is a valid value, must be checked
3284 // signature_ptr - null is a valid value, must be checked
3285 // generic_ptr - null is a valid value, must be checked
3286 jvmtiError
3287 JvmtiEnv::GetFieldName(fieldDescriptor* fdesc_ptr, char** name_ptr, char** signature_ptr, char** generic_ptr) {
3288 JavaThread* current_thread = JavaThread::current();
3289 ResourceMark rm(current_thread);
3290 if (name_ptr == nullptr) {
3291 // just don't return the name
3292 } else {
3293 const char* fieldName = fdesc_ptr->name()->as_C_string();
3294 *name_ptr = (char*) jvmtiMalloc(strlen(fieldName) + 1);
3295 if (*name_ptr == nullptr)
3296 return JVMTI_ERROR_OUT_OF_MEMORY;
3297 strcpy(*name_ptr, fieldName);
3298 }
3299 if (signature_ptr== nullptr) {
3300 // just don't return the signature
3301 } else {
3302 const char* fieldSignature = fdesc_ptr->signature()->as_C_string();
3303 *signature_ptr = (char*) jvmtiMalloc(strlen(fieldSignature) + 1);
3304 if (*signature_ptr == nullptr)
3305 return JVMTI_ERROR_OUT_OF_MEMORY;
3306 strcpy(*signature_ptr, fieldSignature);
3307 }
3308 if (generic_ptr != nullptr) {
3309 *generic_ptr = nullptr;
3310 Symbol* soop = fdesc_ptr->generic_signature();
3311 if (soop != nullptr) {
3312 const char* gen_sig = soop->as_C_string();
3313 if (gen_sig != nullptr) {
3314 jvmtiError err = allocate(strlen(gen_sig) + 1, (unsigned char **)generic_ptr);
3315 if (err != JVMTI_ERROR_NONE) {
3316 return err;
3317 }
3318 strcpy(*generic_ptr, gen_sig);
3319 }
3320 }
3321 }
3322 return JVMTI_ERROR_NONE;
3323 } /* end GetFieldName */
3324
3325
3326 // declaring_class_ptr - pre-checked for null
3327 jvmtiError
3328 JvmtiEnv::GetFieldDeclaringClass(fieldDescriptor* fdesc_ptr, jclass* declaring_class_ptr) {
3329
3330 *declaring_class_ptr = get_jni_class_non_null(fdesc_ptr->field_holder());
3331 return JVMTI_ERROR_NONE;
3332 } /* end GetFieldDeclaringClass */
3333
3334
3335 // modifiers_ptr - pre-checked for null
3336 jvmtiError
3337 JvmtiEnv::GetFieldModifiers(fieldDescriptor* fdesc_ptr, jint* modifiers_ptr) {
3338
3339 AccessFlags resultFlags = fdesc_ptr->access_flags();
3340 jint result = resultFlags.as_int();
3341 *modifiers_ptr = result;
3342
3343 return JVMTI_ERROR_NONE;
3344 } /* end GetFieldModifiers */
3345
3346
3347 // is_synthetic_ptr - pre-checked for null
3348 jvmtiError
3349 JvmtiEnv::IsFieldSynthetic(fieldDescriptor* fdesc_ptr, jboolean* is_synthetic_ptr) {
3350 *is_synthetic_ptr = fdesc_ptr->is_synthetic();
3351 return JVMTI_ERROR_NONE;
3352 } /* end IsFieldSynthetic */
3353
3354
3355 //
3356 // Method functions
3357 //
3358
3359 // method - pre-checked for validity, but may be null meaning obsolete method
3360 // name_ptr - null is a valid value, must be checked
3361 // signature_ptr - null is a valid value, must be checked
3362 // generic_ptr - null is a valid value, must be checked
3363 jvmtiError
3364 JvmtiEnv::GetMethodName(Method* method, char** name_ptr, char** signature_ptr, char** generic_ptr) {
3365 NULL_CHECK(method, JVMTI_ERROR_INVALID_METHODID);
3366 JavaThread* current_thread = JavaThread::current();
3367
3368 ResourceMark rm(current_thread); // get the utf8 name and signature
3369 if (name_ptr == nullptr) {
3370 // just don't return the name
3371 } else {
3372 const char* utf8_name = (const char *) method->name()->as_utf8();
3373 *name_ptr = (char *) jvmtiMalloc(strlen(utf8_name)+1);
3374 strcpy(*name_ptr, utf8_name);
3375 }
3376 if (signature_ptr == nullptr) {
3377 // just don't return the signature
3378 } else {
3379 const char* utf8_signature = (const char *) method->signature()->as_utf8();
3380 *signature_ptr = (char *) jvmtiMalloc(strlen(utf8_signature) + 1);
3381 strcpy(*signature_ptr, utf8_signature);
3382 }
3383
3384 if (generic_ptr != nullptr) {
3385 *generic_ptr = nullptr;
3386 Symbol* soop = method->generic_signature();
3387 if (soop != nullptr) {
3388 const char* gen_sig = soop->as_C_string();
3389 if (gen_sig != nullptr) {
3390 jvmtiError err = allocate(strlen(gen_sig) + 1, (unsigned char **)generic_ptr);
3391 if (err != JVMTI_ERROR_NONE) {
3392 return err;
3393 }
3394 strcpy(*generic_ptr, gen_sig);
3395 }
3396 }
3397 }
3398 return JVMTI_ERROR_NONE;
3399 } /* end GetMethodName */
3400
3401
3402 // method - pre-checked for validity, but may be null meaning obsolete method
3403 // declaring_class_ptr - pre-checked for null
3404 jvmtiError
3405 JvmtiEnv::GetMethodDeclaringClass(Method* method, jclass* declaring_class_ptr) {
3406 NULL_CHECK(method, JVMTI_ERROR_INVALID_METHODID);
3407 (*declaring_class_ptr) = get_jni_class_non_null(method->method_holder());
3408 return JVMTI_ERROR_NONE;
3409 } /* end GetMethodDeclaringClass */
3410
3411
3412 // method - pre-checked for validity, but may be null meaning obsolete method
3413 // modifiers_ptr - pre-checked for null
3414 jvmtiError
3415 JvmtiEnv::GetMethodModifiers(Method* method, jint* modifiers_ptr) {
3416 NULL_CHECK(method, JVMTI_ERROR_INVALID_METHODID);
3417 (*modifiers_ptr) = method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
3418 return JVMTI_ERROR_NONE;
3419 } /* end GetMethodModifiers */
3420
3421
3422 // method - pre-checked for validity, but may be null meaning obsolete method
3423 // max_ptr - pre-checked for null
3424 jvmtiError
3425 JvmtiEnv::GetMaxLocals(Method* method, jint* max_ptr) {
3426 NULL_CHECK(method, JVMTI_ERROR_INVALID_METHODID);
3427 // get max stack
3428 (*max_ptr) = method->max_locals();
3429 return JVMTI_ERROR_NONE;
3430 } /* end GetMaxLocals */
3431
3432
3433 // method - pre-checked for validity, but may be null meaning obsolete method
3434 // size_ptr - pre-checked for null
3435 jvmtiError
3436 JvmtiEnv::GetArgumentsSize(Method* method, jint* size_ptr) {
3437 NULL_CHECK(method, JVMTI_ERROR_INVALID_METHODID);
3438 // get size of arguments
3439
3440 (*size_ptr) = method->size_of_parameters();
3441 return JVMTI_ERROR_NONE;
3442 } /* end GetArgumentsSize */
3443
3444
3445 // method - pre-checked for validity, but may be null meaning obsolete method
3446 // entry_count_ptr - pre-checked for null
3447 // table_ptr - pre-checked for null
3448 jvmtiError
3449 JvmtiEnv::GetLineNumberTable(Method* method, jint* entry_count_ptr, jvmtiLineNumberEntry** table_ptr) {
3450 NULL_CHECK(method, JVMTI_ERROR_INVALID_METHODID);
3451 if (!method->has_linenumber_table()) {
3452 return (JVMTI_ERROR_ABSENT_INFORMATION);
3453 }
3454
3455 // The line number table is compressed so we don't know how big it is until decompressed.
3456 // Decompression is really fast so we just do it twice.
3457
3458 // Compute size of table
3459 jint num_entries = 0;
3460 CompressedLineNumberReadStream stream(method->compressed_linenumber_table());
3461 while (stream.read_pair()) {
3462 num_entries++;
3463 }
3464 jvmtiLineNumberEntry *jvmti_table =
3465 (jvmtiLineNumberEntry *)jvmtiMalloc(num_entries * (sizeof(jvmtiLineNumberEntry)));
3466
3467 // Fill jvmti table
3468 if (num_entries > 0) {
3469 int index = 0;
3470 CompressedLineNumberReadStream stream(method->compressed_linenumber_table());
3471 while (stream.read_pair()) {
3472 jvmti_table[index].start_location = (jlocation) stream.bci();
3473 jvmti_table[index].line_number = (jint) stream.line();
3474 index++;
3475 }
3476 assert(index == num_entries, "sanity check");
3477 }
3478
3479 // Set up results
3480 (*entry_count_ptr) = num_entries;
3481 (*table_ptr) = jvmti_table;
3482
3483 return JVMTI_ERROR_NONE;
3484 } /* end GetLineNumberTable */
3485
3486
3487 // method - pre-checked for validity, but may be null meaning obsolete method
3488 // start_location_ptr - pre-checked for null
3489 // end_location_ptr - pre-checked for null
3490 jvmtiError
3491 JvmtiEnv::GetMethodLocation(Method* method, jlocation* start_location_ptr, jlocation* end_location_ptr) {
3492
3493 NULL_CHECK(method, JVMTI_ERROR_INVALID_METHODID);
3494 // get start and end location
3495 (*end_location_ptr) = (jlocation) (method->code_size() - 1);
3496 if (method->code_size() == 0) {
3497 // there is no code so there is no start location
3498 (*start_location_ptr) = (jlocation)(-1);
3499 } else {
3500 (*start_location_ptr) = (jlocation)(0);
3501 }
3502
3503 return JVMTI_ERROR_NONE;
3504 } /* end GetMethodLocation */
3505
3506
3507 // method - pre-checked for validity, but may be null meaning obsolete method
3508 // entry_count_ptr - pre-checked for null
3509 // table_ptr - pre-checked for null
3510 jvmtiError
3511 JvmtiEnv::GetLocalVariableTable(Method* method, jint* entry_count_ptr, jvmtiLocalVariableEntry** table_ptr) {
3512
3513 NULL_CHECK(method, JVMTI_ERROR_INVALID_METHODID);
3514 JavaThread* current_thread = JavaThread::current();
3515
3516 // does the klass have any local variable information?
3517 InstanceKlass* ik = method->method_holder();
3518 if (!ik->has_localvariable_table()) {
3519 return (JVMTI_ERROR_ABSENT_INFORMATION);
3520 }
3521
3522 ConstantPool* constants = method->constants();
3523 NULL_CHECK(constants, JVMTI_ERROR_ABSENT_INFORMATION);
3524
3525 // in the vm localvariable table representation, 6 consecutive elements in the table
3526 // represent a 6-tuple of shorts
3527 // [start_pc, length, name_index, descriptor_index, signature_index, index]
3528 jint num_entries = method->localvariable_table_length();
3529 jvmtiLocalVariableEntry *jvmti_table = (jvmtiLocalVariableEntry *)
3530 jvmtiMalloc(num_entries * (sizeof(jvmtiLocalVariableEntry)));
3531
3532 if (num_entries > 0) {
3533 LocalVariableTableElement* table = method->localvariable_table_start();
3534 for (int i = 0; i < num_entries; i++) {
3535 // get the 5 tuple information from the vm table
3536 jlocation start_location = (jlocation) table[i].start_bci;
3537 jint length = (jint) table[i].length;
3538 int name_index = (int) table[i].name_cp_index;
3539 int signature_index = (int) table[i].descriptor_cp_index;
3540 int generic_signature_index = (int) table[i].signature_cp_index;
3541 jint slot = (jint) table[i].slot;
3542
3543 // get utf8 name and signature
3544 char *name_buf = nullptr;
3545 char *sig_buf = nullptr;
3546 char *gen_sig_buf = nullptr;
3547 {
3548 ResourceMark rm(current_thread);
3549
3550 const char *utf8_name = (const char *) constants->symbol_at(name_index)->as_utf8();
3551 name_buf = (char *) jvmtiMalloc(strlen(utf8_name)+1);
3552 strcpy(name_buf, utf8_name);
3553
3554 const char *utf8_signature = (const char *) constants->symbol_at(signature_index)->as_utf8();
3555 sig_buf = (char *) jvmtiMalloc(strlen(utf8_signature)+1);
3556 strcpy(sig_buf, utf8_signature);
3557
3558 if (generic_signature_index > 0) {
3559 const char *utf8_gen_sign = (const char *)
3560 constants->symbol_at(generic_signature_index)->as_utf8();
3561 gen_sig_buf = (char *) jvmtiMalloc(strlen(utf8_gen_sign)+1);
3562 strcpy(gen_sig_buf, utf8_gen_sign);
3563 }
3564 }
3565
3566 // fill in the jvmti local variable table
3567 jvmti_table[i].start_location = start_location;
3568 jvmti_table[i].length = length;
3569 jvmti_table[i].name = name_buf;
3570 jvmti_table[i].signature = sig_buf;
3571 jvmti_table[i].generic_signature = gen_sig_buf;
3572 jvmti_table[i].slot = slot;
3573 }
3574 }
3575
3576 // set results
3577 (*entry_count_ptr) = num_entries;
3578 (*table_ptr) = jvmti_table;
3579
3580 return JVMTI_ERROR_NONE;
3581 } /* end GetLocalVariableTable */
3582
3583
3584 // method - pre-checked for validity, but may be null meaning obsolete method
3585 // bytecode_count_ptr - pre-checked for null
3586 // bytecodes_ptr - pre-checked for null
3587 jvmtiError
3588 JvmtiEnv::GetBytecodes(Method* method, jint* bytecode_count_ptr, unsigned char** bytecodes_ptr) {
3589 NULL_CHECK(method, JVMTI_ERROR_INVALID_METHODID);
3590
3591 methodHandle mh(Thread::current(), method);
3592 jint size = (jint)mh->code_size();
3593 jvmtiError err = allocate(size, bytecodes_ptr);
3594 if (err != JVMTI_ERROR_NONE) {
3595 return err;
3596 }
3597
3598 (*bytecode_count_ptr) = size;
3599 // get byte codes
3600 JvmtiClassFileReconstituter::copy_bytecodes(mh, *bytecodes_ptr);
3601
3602 return JVMTI_ERROR_NONE;
3603 } /* end GetBytecodes */
3604
3605
3606 // method - pre-checked for validity, but may be null meaning obsolete method
3607 // is_native_ptr - pre-checked for null
3608 jvmtiError
3609 JvmtiEnv::IsMethodNative(Method* method, jboolean* is_native_ptr) {
3610 NULL_CHECK(method, JVMTI_ERROR_INVALID_METHODID);
3611 (*is_native_ptr) = method->is_native();
3612 return JVMTI_ERROR_NONE;
3613 } /* end IsMethodNative */
3614
3615
3616 // method - pre-checked for validity, but may be null meaning obsolete method
3617 // is_synthetic_ptr - pre-checked for null
3618 jvmtiError
3619 JvmtiEnv::IsMethodSynthetic(Method* method, jboolean* is_synthetic_ptr) {
3620 NULL_CHECK(method, JVMTI_ERROR_INVALID_METHODID);
3621 (*is_synthetic_ptr) = method->is_synthetic();
3622 return JVMTI_ERROR_NONE;
3623 } /* end IsMethodSynthetic */
3624
3625
3626 // method - pre-checked for validity, but may be null meaning obsolete method
3627 // is_obsolete_ptr - pre-checked for null
3628 jvmtiError
3629 JvmtiEnv::IsMethodObsolete(Method* method, jboolean* is_obsolete_ptr) {
3630 if (use_version_1_0_semantics() &&
3631 get_capabilities()->can_redefine_classes == 0) {
3632 // This JvmtiEnv requested version 1.0 semantics and this function
3633 // requires the can_redefine_classes capability in version 1.0 so
3634 // we need to return an error here.
3635 return JVMTI_ERROR_MUST_POSSESS_CAPABILITY;
3636 }
3637
3638 if (method == nullptr || method->is_obsolete()) {
3639 *is_obsolete_ptr = true;
3640 } else {
3641 *is_obsolete_ptr = false;
3642 }
3643 return JVMTI_ERROR_NONE;
3644 } /* end IsMethodObsolete */
3645
3646 //
3647 // Raw Monitor functions
3648 //
3649
3650 // name - pre-checked for null
3651 // monitor_ptr - pre-checked for null
3652 jvmtiError
3653 JvmtiEnv::CreateRawMonitor(const char* name, jrawMonitorID* monitor_ptr) {
3654 JvmtiRawMonitor* rmonitor = new JvmtiRawMonitor(name);
3655 NULL_CHECK(rmonitor, JVMTI_ERROR_OUT_OF_MEMORY);
3656
3657 *monitor_ptr = (jrawMonitorID)rmonitor;
3658
3659 return JVMTI_ERROR_NONE;
3660 } /* end CreateRawMonitor */
3661
3662
3663 // rmonitor - pre-checked for validity
3664 jvmtiError
3665 JvmtiEnv::DestroyRawMonitor(JvmtiRawMonitor * rmonitor) {
3666 if (Threads::number_of_threads() == 0) {
3667 // Remove this monitor from pending raw monitors list
3668 // if it has entered in onload or start phase.
3669 JvmtiPendingMonitors::destroy(rmonitor);
3670 } else {
3671 Thread* thread = Thread::current();
3672 if (rmonitor->owner() == thread) {
3673 // The caller owns this monitor which we are about to destroy.
3674 // We exit the underlying synchronization object so that the
3675 // "delete monitor" call below can work without an assertion
3676 // failure on systems that don't like destroying synchronization
3677 // objects that are locked.
3678 int r;
3679 int recursion = rmonitor->recursions();
3680 for (int i = 0; i <= recursion; i++) {
3681 r = rmonitor->raw_exit(thread);
3682 assert(r == JvmtiRawMonitor::M_OK, "raw_exit should have worked");
3683 if (r != JvmtiRawMonitor::M_OK) { // robustness
3684 return JVMTI_ERROR_INTERNAL;
3685 }
3686 }
3687 }
3688 if (rmonitor->owner() != nullptr) {
3689 // The caller is trying to destroy a monitor that is locked by
3690 // someone else. While this is not forbidden by the JVMTI
3691 // spec, it will cause an assertion failure on systems that don't
3692 // like destroying synchronization objects that are locked.
3693 // We indicate a problem with the error return (and leak the
3694 // monitor's memory).
3695 return JVMTI_ERROR_NOT_MONITOR_OWNER;
3696 }
3697 }
3698
3699 delete rmonitor;
3700
3701 return JVMTI_ERROR_NONE;
3702 } /* end DestroyRawMonitor */
3703
3704
3705 // rmonitor - pre-checked for validity
3706 jvmtiError
3707 JvmtiEnv::RawMonitorEnter(JvmtiRawMonitor * rmonitor) {
3708 if (Threads::number_of_threads() == 0) {
3709 // No JavaThreads exist so JvmtiRawMonitor enter cannot be
3710 // used, add this raw monitor to the pending list.
3711 // The pending monitors will be actually entered when
3712 // the VM is setup.
3713 // See transition_pending_raw_monitors in create_vm()
3714 // in thread.cpp.
3715 JvmtiPendingMonitors::enter(rmonitor);
3716 } else {
3717 Thread* thread = Thread::current();
3718 // 8266889: raw_enter changes Java thread state, needs WXWrite
3719 MACOS_AARCH64_ONLY(ThreadWXEnable __wx(WXWrite, thread));
3720 rmonitor->raw_enter(thread);
3721 }
3722 return JVMTI_ERROR_NONE;
3723 } /* end RawMonitorEnter */
3724
3725
3726 // rmonitor - pre-checked for validity
3727 jvmtiError
3728 JvmtiEnv::RawMonitorExit(JvmtiRawMonitor * rmonitor) {
3729 jvmtiError err = JVMTI_ERROR_NONE;
3730
3731 if (Threads::number_of_threads() == 0) {
3732 // No JavaThreads exist so just remove this monitor from the pending list.
3733 // Bool value from exit is false if rmonitor is not in the list.
3734 if (!JvmtiPendingMonitors::exit(rmonitor)) {
3735 err = JVMTI_ERROR_NOT_MONITOR_OWNER;
3736 }
3737 } else {
3738 Thread* thread = Thread::current();
3739 int r = rmonitor->raw_exit(thread);
3740 if (r == JvmtiRawMonitor::M_ILLEGAL_MONITOR_STATE) {
3741 err = JVMTI_ERROR_NOT_MONITOR_OWNER;
3742 }
3743 }
3744 return err;
3745 } /* end RawMonitorExit */
3746
3747
3748 // rmonitor - pre-checked for validity
3749 jvmtiError
3750 JvmtiEnv::RawMonitorWait(JvmtiRawMonitor * rmonitor, jlong millis) {
3751 Thread* thread = Thread::current();
3752 // 8266889: raw_wait changes Java thread state, needs WXWrite
3753 MACOS_AARCH64_ONLY(ThreadWXEnable __wx(WXWrite, thread));
3754 int r = rmonitor->raw_wait(millis, thread);
3755
3756 switch (r) {
3757 case JvmtiRawMonitor::M_INTERRUPTED:
3758 return JVMTI_ERROR_INTERRUPT;
3759 case JvmtiRawMonitor::M_ILLEGAL_MONITOR_STATE:
3760 return JVMTI_ERROR_NOT_MONITOR_OWNER;
3761 default:
3762 return JVMTI_ERROR_NONE;
3763 }
3764 } /* end RawMonitorWait */
3765
3766
3767 // rmonitor - pre-checked for validity
3768 jvmtiError
3769 JvmtiEnv::RawMonitorNotify(JvmtiRawMonitor * rmonitor) {
3770 Thread* thread = Thread::current();
3771 int r = rmonitor->raw_notify(thread);
3772
3773 if (r == JvmtiRawMonitor::M_ILLEGAL_MONITOR_STATE) {
3774 return JVMTI_ERROR_NOT_MONITOR_OWNER;
3775 }
3776 return JVMTI_ERROR_NONE;
3777 } /* end RawMonitorNotify */
3778
3779
3780 // rmonitor - pre-checked for validity
3781 jvmtiError
3782 JvmtiEnv::RawMonitorNotifyAll(JvmtiRawMonitor * rmonitor) {
3783 Thread* thread = Thread::current();
3784 int r = rmonitor->raw_notifyAll(thread);
3785
3786 if (r == JvmtiRawMonitor::M_ILLEGAL_MONITOR_STATE) {
3787 return JVMTI_ERROR_NOT_MONITOR_OWNER;
3788 }
3789 return JVMTI_ERROR_NONE;
3790 } /* end RawMonitorNotifyAll */
3791
3792
3793 //
3794 // JNI Function Interception functions
3795 //
3796
3797
3798 // function_table - pre-checked for null
3799 jvmtiError
3800 JvmtiEnv::SetJNIFunctionTable(const jniNativeInterface* function_table) {
3801 // Copy jni function table at safepoint.
3802 VM_JNIFunctionTableCopier copier(function_table);
3803 VMThread::execute(&copier);
3804
3805 return JVMTI_ERROR_NONE;
3806 } /* end SetJNIFunctionTable */
3807
3808
3809 // function_table - pre-checked for null
3810 jvmtiError
3811 JvmtiEnv::GetJNIFunctionTable(jniNativeInterface** function_table) {
3812 *function_table=(jniNativeInterface*)jvmtiMalloc(sizeof(jniNativeInterface));
3813 if (*function_table == nullptr)
3814 return JVMTI_ERROR_OUT_OF_MEMORY;
3815 memcpy(*function_table,(JavaThread::current())->get_jni_functions(),sizeof(jniNativeInterface));
3816 return JVMTI_ERROR_NONE;
3817 } /* end GetJNIFunctionTable */
3818
3819
3820 //
3821 // Event Management functions
3822 //
3823
3824 jvmtiError
3825 JvmtiEnv::GenerateEvents(jvmtiEvent event_type) {
3826 // can only generate two event types
3827 if (event_type != JVMTI_EVENT_COMPILED_METHOD_LOAD &&
3828 event_type != JVMTI_EVENT_DYNAMIC_CODE_GENERATED) {
3829 return JVMTI_ERROR_ILLEGAL_ARGUMENT;
3830 }
3831
3832 // for compiled_method_load events we must check that the environment
3833 // has the can_generate_compiled_method_load_events capability.
3834 if (event_type == JVMTI_EVENT_COMPILED_METHOD_LOAD) {
3835 if (get_capabilities()->can_generate_compiled_method_load_events == 0) {
3836 return JVMTI_ERROR_MUST_POSSESS_CAPABILITY;
3837 }
3838 return JvmtiCodeBlobEvents::generate_compiled_method_load_events(this);
3839 } else {
3840 return JvmtiCodeBlobEvents::generate_dynamic_code_events(this);
3841 }
3842
3843 } /* end GenerateEvents */
3844
3845
3846 //
3847 // Extension Mechanism functions
3848 //
3849
3850 // extension_count_ptr - pre-checked for null
3851 // extensions - pre-checked for null
3852 jvmtiError
3853 JvmtiEnv::GetExtensionFunctions(jint* extension_count_ptr, jvmtiExtensionFunctionInfo** extensions) {
3854 return JvmtiExtensions::get_functions(this, extension_count_ptr, extensions);
3855 } /* end GetExtensionFunctions */
3856
3857
3858 // extension_count_ptr - pre-checked for null
3859 // extensions - pre-checked for null
3860 jvmtiError
3861 JvmtiEnv::GetExtensionEvents(jint* extension_count_ptr, jvmtiExtensionEventInfo** extensions) {
3862 return JvmtiExtensions::get_events(this, extension_count_ptr, extensions);
3863 } /* end GetExtensionEvents */
3864
3865
3866 // callback - null is a valid value, must be checked
3867 jvmtiError
3868 JvmtiEnv::SetExtensionEventCallback(jint extension_event_index, jvmtiExtensionEvent callback) {
3869 return JvmtiExtensions::set_event_callback(this, extension_event_index, callback);
3870 } /* end SetExtensionEventCallback */
3871
3872 //
3873 // Timers functions
3874 //
3875
3876 // info_ptr - pre-checked for null
3877 jvmtiError
3878 JvmtiEnv::GetCurrentThreadCpuTimerInfo(jvmtiTimerInfo* info_ptr) {
3879 os::current_thread_cpu_time_info(info_ptr);
3880 return JVMTI_ERROR_NONE;
3881 } /* end GetCurrentThreadCpuTimerInfo */
3882
3883
3884 // nanos_ptr - pre-checked for null
3885 jvmtiError
3886 JvmtiEnv::GetCurrentThreadCpuTime(jlong* nanos_ptr) {
3887 Thread* thread = Thread::current();
3888
3889 // Surprisingly the GetCurrentThreadCpuTime is used by non-JavaThread's.
3890 if (thread->is_Java_thread()) {
3891 if (JavaThread::cast(thread)->is_vthread_mounted()) {
3892 // No support for a VirtualThread (yet).
3893 return JVMTI_ERROR_UNSUPPORTED_OPERATION;
3894 }
3895 }
3896 *nanos_ptr = os::current_thread_cpu_time();
3897 return JVMTI_ERROR_NONE;
3898 } /* end GetCurrentThreadCpuTime */
3899
3900
3901 // info_ptr - pre-checked for null
3902 jvmtiError
3903 JvmtiEnv::GetThreadCpuTimerInfo(jvmtiTimerInfo* info_ptr) {
3904 os::thread_cpu_time_info(info_ptr);
3905 return JVMTI_ERROR_NONE;
3906 } /* end GetThreadCpuTimerInfo */
3907
3908
3909 // nanos_ptr - pre-checked for null
3910 jvmtiError
3911 JvmtiEnv::GetThreadCpuTime(jthread thread, jlong* nanos_ptr) {
3912 JavaThread* current_thread = JavaThread::current();
3913 ThreadsListHandle tlh(current_thread);
3914 JavaThread* java_thread = nullptr;
3915 oop thread_oop = nullptr;
3916
3917 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, &java_thread, &thread_oop);
3918
3919 if (thread_oop != nullptr && thread_oop->is_a(vmClasses::BaseVirtualThread_klass())) {
3920 // No support for virtual threads (yet).
3921 return JVMTI_ERROR_UNSUPPORTED_OPERATION;
3922 }
3923 if (err != JVMTI_ERROR_NONE) {
3924 return err;
3925 }
3926 NULL_CHECK(nanos_ptr, JVMTI_ERROR_NULL_POINTER);
3927
3928 *nanos_ptr = os::thread_cpu_time(java_thread);
3929 return JVMTI_ERROR_NONE;
3930 } /* end GetThreadCpuTime */
3931
3932
3933 // info_ptr - pre-checked for null
3934 jvmtiError
3935 JvmtiEnv::GetTimerInfo(jvmtiTimerInfo* info_ptr) {
3936 os::javaTimeNanos_info(info_ptr);
3937 return JVMTI_ERROR_NONE;
3938 } /* end GetTimerInfo */
3939
3940
3941 // nanos_ptr - pre-checked for null
3942 jvmtiError
3943 JvmtiEnv::GetTime(jlong* nanos_ptr) {
3944 *nanos_ptr = os::javaTimeNanos();
3945 return JVMTI_ERROR_NONE;
3946 } /* end GetTime */
3947
3948
3949 // processor_count_ptr - pre-checked for null
3950 jvmtiError
3951 JvmtiEnv::GetAvailableProcessors(jint* processor_count_ptr) {
3952 *processor_count_ptr = os::active_processor_count();
3953 return JVMTI_ERROR_NONE;
3954 } /* end GetAvailableProcessors */
3955
3956 jvmtiError
3957 JvmtiEnv::SetHeapSamplingInterval(jint sampling_interval) {
3958 if (sampling_interval < 0) {
3959 return JVMTI_ERROR_ILLEGAL_ARGUMENT;
3960 }
3961 ThreadHeapSampler::set_sampling_interval(sampling_interval);
3962 return JVMTI_ERROR_NONE;
3963 } /* end SetHeapSamplingInterval */
3964
3965 //
3966 // System Properties functions
3967 //
3968
3969 // count_ptr - pre-checked for null
3970 // property_ptr - pre-checked for null
3971 jvmtiError
3972 JvmtiEnv::GetSystemProperties(jint* count_ptr, char*** property_ptr) {
3973 jvmtiError err = JVMTI_ERROR_NONE;
3974
3975 // Get the number of readable properties.
3976 *count_ptr = Arguments::PropertyList_readable_count(Arguments::system_properties());
3977
3978 // Allocate memory to hold the exact number of readable properties.
3979 err = allocate(*count_ptr * sizeof(char *), (unsigned char **)property_ptr);
3980 if (err != JVMTI_ERROR_NONE) {
3981 return err;
3982 }
3983 int readable_count = 0;
3984 // Loop through the system properties until all the readable properties are found.
3985 for (SystemProperty* p = Arguments::system_properties(); p != nullptr && readable_count < *count_ptr; p = p->next()) {
3986 if (p->readable()) {
3987 const char *key = p->key();
3988 char **tmp_value = *property_ptr+readable_count;
3989 readable_count++;
3990 err = allocate((strlen(key)+1) * sizeof(char), (unsigned char**)tmp_value);
3991 if (err == JVMTI_ERROR_NONE) {
3992 strcpy(*tmp_value, key);
3993 } else {
3994 // clean up previously allocated memory.
3995 for (int j = 0; j < readable_count; j++) {
3996 Deallocate((unsigned char*)*property_ptr+j);
3997 }
3998 Deallocate((unsigned char*)property_ptr);
3999 break;
4000 }
4001 }
4002 }
4003 assert(err != JVMTI_ERROR_NONE || readable_count == *count_ptr, "Bad readable property count");
4004 return err;
4005 } /* end GetSystemProperties */
4006
4007
4008 // property - pre-checked for null
4009 // value_ptr - pre-checked for null
4010 jvmtiError
4011 JvmtiEnv::GetSystemProperty(const char* property, char** value_ptr) {
4012 jvmtiError err = JVMTI_ERROR_NONE;
4013 const char *value;
4014
4015 // Return JVMTI_ERROR_NOT_AVAILABLE if property is not readable or doesn't exist.
4016 value = Arguments::PropertyList_get_readable_value(Arguments::system_properties(), property);
4017 if (value == nullptr) {
4018 err = JVMTI_ERROR_NOT_AVAILABLE;
4019 } else {
4020 err = allocate((strlen(value)+1) * sizeof(char), (unsigned char **)value_ptr);
4021 if (err == JVMTI_ERROR_NONE) {
4022 strcpy(*value_ptr, value);
4023 }
4024 }
4025 return err;
4026 } /* end GetSystemProperty */
4027
4028
4029 // property - pre-checked for null
4030 // value - null is a valid value, must be checked
4031 jvmtiError
4032 JvmtiEnv::SetSystemProperty(const char* property, const char* value_ptr) {
4033 for (SystemProperty* p = Arguments::system_properties(); p != nullptr; p = p->next()) {
4034 if (strcmp(property, p->key()) == 0) {
4035 if (p->writeable()) {
4036 if (p->set_value(value_ptr, AllocFailStrategy::RETURN_NULL)) {
4037 return JVMTI_ERROR_NONE;
4038 } else {
4039 return JVMTI_ERROR_OUT_OF_MEMORY;
4040 }
4041 } else {
4042 // We found a property, but it's not writeable
4043 return JVMTI_ERROR_NOT_AVAILABLE;
4044 }
4045 }
4046 }
4047
4048 // We cannot find a property of the given name
4049 return JVMTI_ERROR_NOT_AVAILABLE;
4050 } /* end SetSystemProperty */