1 /*
2 * Copyright (c) 2003, 2022, 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 = NULL;
152 JvmtiVTMSTransitionDisabler disabler;
153 ThreadsListHandle tlh(current);
154
155 JavaThread* java_thread = NULL;
156 oop thread_obj = NULL;
157 if (thread == NULL) {
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 == NULL) {
168 if (data == NULL) {
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 == NULL) {
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 == NULL) {
191 JvmtiThreadState* state = current_thread->jvmti_thread_state();
192 *data_ptr = (state == NULL) ? NULL :
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;
206 ThreadsListHandle tlh(current_thread);
207
208 JavaThread* java_thread = NULL;
209 oop thread_obj = NULL;
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 == NULL) ? NULL :
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 != NULL ? JNIHandles::make_local(THREAD, module) : NULL;
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 == NULL) {
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() == NULL) {
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 == NULL?
526 SetNativeMethodPrefixes(0, NULL) :
527 SetNativeMethodPrefixes(1, (char**)&prefix);
528 } /* end SetNativeMethodPrefix */
529
530
531 // prefix_count - pre-checked to be greater than or equal to 0
532 // prefixes - pre-checked for NULL
533 jvmtiError
534 JvmtiEnv::SetNativeMethodPrefixes(jint prefix_count, char** prefixes) {
535 // Have to grab JVMTI thread state lock to be sure that some thread
536 // isn't accessing the prefixes at the same time we are setting them.
537 // No locks during VM bring-up.
538 if (Threads::number_of_threads() == 0) {
539 return set_native_method_prefixes(prefix_count, prefixes);
540 } else {
541 MutexLocker mu(JvmtiThreadState_lock);
542 return set_native_method_prefixes(prefix_count, prefixes);
543 }
544 } /* end SetNativeMethodPrefixes */
545
546 //
547 // Event Management functions
548 //
549
550 // callbacks - NULL is a valid value, must be checked
551 // size_of_callbacks - pre-checked to be greater than or equal to 0
552 jvmtiError
553 JvmtiEnv::SetEventCallbacks(const jvmtiEventCallbacks* callbacks, jint size_of_callbacks) {
554 JvmtiVTMSTransitionDisabler disabler;
555 JvmtiEventController::set_event_callbacks(this, callbacks, size_of_callbacks);
556 return JVMTI_ERROR_NONE;
557 } /* end SetEventCallbacks */
558
559
560 // event_thread - NULL is a valid value, must be checked
561 jvmtiError
562 JvmtiEnv::SetEventNotificationMode(jvmtiEventMode mode, jvmtiEvent event_type, jthread event_thread, ...) {
563 bool enabled = (mode == JVMTI_ENABLE);
564
565 // event_type must be valid
566 if (!JvmtiEventController::is_valid_event_type(event_type)) {
567 return JVMTI_ERROR_INVALID_EVENT_TYPE;
568 }
569
570 // assure that needed capabilities are present
571 if (enabled && !JvmtiUtil::has_event_capability(event_type, get_capabilities())) {
572 return JVMTI_ERROR_MUST_POSSESS_CAPABILITY;
573 }
574
575 if (event_type == JVMTI_EVENT_CLASS_FILE_LOAD_HOOK && enabled) {
576 record_class_file_load_hook_enabled();
577 }
578 JvmtiVTMSTransitionDisabler disabler;
579
580 if (event_thread == NULL) {
581 // Can be called at Agent_OnLoad() time with event_thread == NULL
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, NULL, (oop) NULL, event_type, enabled);
587 } else {
588 // We have a specified event_thread.
589 ThreadsListHandle tlh;
590
591 JavaThread* java_thread = NULL;
592 oop thread_obj = NULL;
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 == NULL) {
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 != NULL; 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 == NULL) {
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 == NULL) {
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;
860 ThreadsListHandle tlh(current_thread);
861
862 JavaThread* java_thread = NULL;
863 oop thread_oop = NULL;
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 = NULL;
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 = NULL;
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
932 jvmtiError err;
933 JavaThread* java_thread = NULL;
934 oop thread_oop = NULL;
935 {
936 JvmtiVTMSTransitionDisabler disabler(true);
937 ThreadsListHandle tlh(current);
938
939 err = get_threadOop_and_JavaThread(tlh.list(), thread, &java_thread, &thread_oop);
940 if (err != JVMTI_ERROR_NONE) {
941 return err;
942 }
943
944 // Do not use JvmtiVTMSTransitionDisabler in context of self suspend to avoid deadlocks.
945 if (java_thread != current) {
946 err = suspend_thread(thread_oop, java_thread, /* single_suspend */ true, NULL);
947 return err;
948 }
949 }
950 // Do self suspend for current JavaThread.
951 err = suspend_thread(thread_oop, current, /* single_suspend */ true, NULL);
952 return err;
953 } /* end SuspendThread */
954
955
956 // request_count - pre-checked to be greater than or equal to 0
957 // request_list - pre-checked for NULL
958 // results - pre-checked for NULL
959 jvmtiError
960 JvmtiEnv::SuspendThreadList(jint request_count, const jthread* request_list, jvmtiError* results) {
961 JavaThread* current = JavaThread::current();
962 HandleMark hm(current);
963 Handle self_tobj = Handle(current, NULL);
964 int self_idx = -1;
965
966 {
967 JvmtiVTMSTransitionDisabler disabler(true);
968 ThreadsListHandle tlh(current);
969
970 for (int i = 0; i < request_count; i++) {
971 JavaThread *java_thread = NULL;
972 oop thread_oop = NULL;
973 jthread thread = request_list[i];
974 jvmtiError err = JvmtiExport::cv_external_thread_to_JavaThread(tlh.list(), thread, &java_thread, &thread_oop);
975
976 if (thread_oop != NULL &&
977 java_lang_VirtualThread::is_instance(thread_oop) &&
978 !JvmtiEnvBase::is_vthread_alive(thread_oop)) {
979 err = JVMTI_ERROR_THREAD_NOT_ALIVE;
980 }
981 if (err != JVMTI_ERROR_NONE) {
982 if (thread_oop == NULL || err != JVMTI_ERROR_INVALID_THREAD) {
983 results[i] = err;
984 continue;
985 }
986 }
987 if (java_thread == current) {
988 self_idx = i;
989 self_tobj = Handle(current, thread_oop);
990 continue; // self suspend after all other suspends
991 }
992 results[i] = suspend_thread(thread_oop, java_thread, /* single_suspend */ true, NULL);
993 }
994 }
995 // Self suspend after all other suspends if necessary.
996 // Do not use JvmtiVTMSTransitionDisabler in context of self suspend to avoid deadlocks.
997 if (self_tobj() != NULL) {
998 // there should not be any error for current java_thread
999 results[self_idx] = suspend_thread(self_tobj(), current, /* single_suspend */ true, NULL);
1000 }
1001 // per-thread suspend results returned via results parameter
1002 return JVMTI_ERROR_NONE;
1003 } /* end SuspendThreadList */
1004
1005
1006 jvmtiError
1007 JvmtiEnv::SuspendAllVirtualThreads(jint except_count, const jthread* except_list) {
1008 if (!JvmtiExport::can_support_virtual_threads()) {
1009 return JVMTI_ERROR_MUST_POSSESS_CAPABILITY;
1010 }
1011 if (!Continuations::enabled()) {
1012 return JVMTI_ERROR_NONE; // Nothing to do when there are no virtual threads;
1013 }
1014 JavaThread* current = JavaThread::current();
1015 HandleMark hm(current);
1016 Handle self_tobj = Handle(current, NULL);
1017
1018 {
1019 ResourceMark rm(current);
1020 JvmtiVTMSTransitionDisabler disabler(true);
1021 ThreadsListHandle tlh(current);
1022 GrowableArray<jthread>* elist = new GrowableArray<jthread>(except_count);
1023
1024 jvmtiError err = JvmtiEnvBase::check_thread_list(except_count, except_list);
1025 if (err != JVMTI_ERROR_NONE) {
1026 return err;
1027 }
1028
1029 // Collect threads from except_list for which resumed status must be restored.
1030 for (int idx = 0; idx < except_count; idx++) {
1031 jthread thread = except_list[idx];
1032 oop thread_oop = JNIHandles::resolve_external_guard(thread);
1033 if (!JvmtiVTSuspender::is_vthread_suspended(thread_oop)) {
1034 // is not suspended, so its resumed status must be restored
1035 elist->append(except_list[idx]);
1036 }
1037 }
1038
1039 for (JavaThreadIteratorWithHandle jtiwh; JavaThread *java_thread = jtiwh.next(); ) {
1040 oop vt_oop = java_thread->jvmti_vthread();
1041 if (!java_thread->is_exiting() &&
1042 !java_thread->is_jvmti_agent_thread() &&
1043 !java_thread->is_hidden_from_external_view() &&
1044 vt_oop != NULL &&
1045 java_lang_VirtualThread::is_instance(vt_oop) &&
1046 JvmtiEnvBase::is_vthread_alive(vt_oop) &&
1047 !JvmtiVTSuspender::is_vthread_suspended(vt_oop) &&
1048 !is_in_thread_list(except_count, except_list, vt_oop)
1049 ) {
1050 if (java_thread == current) {
1051 self_tobj = Handle(current, vt_oop);
1052 continue; // self suspend after all other suspends
1053 }
1054 suspend_thread(vt_oop, java_thread, /* single_suspend */ false, NULL);
1055 }
1056 }
1057 JvmtiVTSuspender::register_all_vthreads_suspend();
1058
1059 // Restore resumed state for threads from except list that were not suspended before.
1060 for (int idx = 0; idx < elist->length(); idx++) {
1061 jthread thread = elist->at(idx);
1062 oop thread_oop = JNIHandles::resolve_external_guard(thread);
1063 if (JvmtiVTSuspender::is_vthread_suspended(thread_oop)) {
1064 JvmtiVTSuspender::register_vthread_resume(thread_oop);
1065 }
1066 }
1067 }
1068 // Self suspend after all other suspends if necessary.
1069 // Do not use JvmtiVTMSTransitionDisabler in context of self suspend to avoid deadlocks.
1070 if (self_tobj() != NULL) {
1071 suspend_thread(self_tobj(), current, /* single_suspend */ false, NULL);
1072 }
1073 return JVMTI_ERROR_NONE;
1074 } /* end SuspendAllVirtualThreads */
1075
1076
1077 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
1078 jvmtiError
1079 JvmtiEnv::ResumeThread(jthread thread) {
1080 JvmtiVTMSTransitionDisabler disabler(true);
1081 ThreadsListHandle tlh;
1082
1083 JavaThread* java_thread = NULL;
1084 oop thread_oop = NULL;
1085 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, &java_thread, &thread_oop);
1086 if (err != JVMTI_ERROR_NONE) {
1087 return err;
1088 }
1089 err = resume_thread(thread_oop, java_thread, /* single_resume */ true);
1090 return err;
1091 } /* end ResumeThread */
1092
1093
1094 // request_count - pre-checked to be greater than or equal to 0
1095 // request_list - pre-checked for NULL
1096 // results - pre-checked for NULL
1097 jvmtiError
1098 JvmtiEnv::ResumeThreadList(jint request_count, const jthread* request_list, jvmtiError* results) {
1099 oop thread_oop = NULL;
1100 JavaThread* java_thread = NULL;
1101 JvmtiVTMSTransitionDisabler disabler(true);
1102 ThreadsListHandle tlh;
1103
1104 for (int i = 0; i < request_count; i++) {
1105 jthread thread = request_list[i];
1106 jvmtiError err = JvmtiExport::cv_external_thread_to_JavaThread(tlh.list(), thread, &java_thread, &thread_oop);
1107
1108 if (thread_oop != NULL &&
1109 java_lang_VirtualThread::is_instance(thread_oop) &&
1110 !JvmtiEnvBase::is_vthread_alive(thread_oop)) {
1111 err = JVMTI_ERROR_THREAD_NOT_ALIVE;
1112 }
1113 if (err != JVMTI_ERROR_NONE) {
1114 if (thread_oop == NULL || err != JVMTI_ERROR_INVALID_THREAD) {
1115 results[i] = err;
1116 continue;
1117 }
1118 }
1119 results[i] = resume_thread(thread_oop, java_thread, /* single_resume */ true);
1120 }
1121 // per-thread resume results returned via results parameter
1122 return JVMTI_ERROR_NONE;
1123 } /* end ResumeThreadList */
1124
1125
1126 jvmtiError
1127 JvmtiEnv::ResumeAllVirtualThreads(jint except_count, const jthread* except_list) {
1128 if (!JvmtiExport::can_support_virtual_threads()) {
1129 return JVMTI_ERROR_MUST_POSSESS_CAPABILITY;
1130 }
1131 if (!Continuations::enabled()) {
1132 return JVMTI_ERROR_NONE; // Nothing to do when there are no virtual threads;
1133 }
1134 jvmtiError err = JvmtiEnvBase::check_thread_list(except_count, except_list);
1135 if (err != JVMTI_ERROR_NONE) {
1136 return err;
1137 }
1138 ResourceMark rm;
1139 JvmtiVTMSTransitionDisabler disabler(true);
1140 GrowableArray<jthread>* elist = new GrowableArray<jthread>(except_count);
1141
1142 // Collect threads from except_list for which suspended status must be restored.
1143 for (int idx = 0; idx < except_count; idx++) {
1144 jthread thread = except_list[idx];
1145 oop thread_oop = JNIHandles::resolve_external_guard(thread);
1146 if (JvmtiVTSuspender::is_vthread_suspended(thread_oop)) {
1147 // is suspended, so its suspended status must be restored
1148 elist->append(except_list[idx]);
1149 }
1150 }
1151
1152 for (JavaThreadIteratorWithHandle jtiwh; JavaThread *java_thread = jtiwh.next(); ) {
1153 oop vt_oop = java_thread->jvmti_vthread();
1154 if (!java_thread->is_exiting() &&
1155 !java_thread->is_jvmti_agent_thread() &&
1156 !java_thread->is_hidden_from_external_view() &&
1157 vt_oop != NULL &&
1158 java_lang_VirtualThread::is_instance(vt_oop) &&
1159 JvmtiEnvBase::is_vthread_alive(vt_oop) &&
1160 JvmtiVTSuspender::is_vthread_suspended(vt_oop) &&
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;
1185 ThreadsListHandle tlh(current_thread);
1186 JavaThread* java_thread = NULL;
1187 oop thread_oop = NULL;
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 != NULL && java_lang_VirtualThread::is_instance(thread_oop)) {
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;
1217 ThreadsListHandle tlh(current_thread);
1218
1219 JavaThread* java_thread = NULL;
1220 oop thread_obj = NULL;
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 = NULL;
1259 oop thread_oop = NULL;
1260
1261 JvmtiVTMSTransitionDisabler disabler;
1262 ThreadsListHandle tlh(current_thread);
1263
1264 // if thread is NULL the current thread is used
1265 if (thread == NULL) {
1266 java_thread = JavaThread::current();
1267 thread_oop = get_vthread_or_thread_oop(java_thread);
1268 if (thread_oop == NULL || !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 == NULL) {
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, NULL);
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, NULL);
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 if (loader != NULL) {
1315 // Do the same as Thread.getContextClassLoader and set context_class_loader to be
1316 // the system class loader when the field value is the "not supported" placeholder.
1317 if (loader == java_lang_Thread_Constants::get_NOT_SUPPORTED_CLASSLOADER()) {
1318 loader = SystemDictionary::java_system_loader();
1319 }
1320 }
1321 context_class_loader = Handle(current_thread, loader);
1322
1323 { const char *n;
1324
1325 if (name() != NULL) {
1326 n = java_lang_String::as_utf8_string(name());
1327 } else {
1328 int utf8_length = 0;
1329 n = UNICODE::as_utf8((jchar*) NULL, utf8_length);
1330 }
1331
1332 info_ptr->name = (char *) jvmtiMalloc(strlen(n)+1);
1333 if (info_ptr->name == NULL)
1334 return JVMTI_ERROR_OUT_OF_MEMORY;
1335
1336 strcpy(info_ptr->name, n);
1337 }
1338 info_ptr->is_daemon = is_daemon;
1339 info_ptr->priority = priority;
1340
1341 info_ptr->context_class_loader = (context_class_loader.is_null()) ? NULL :
1342 jni_reference(context_class_loader);
1343 info_ptr->thread_group = jni_reference(thread_group);
1344
1345 return JVMTI_ERROR_NONE;
1346 } /* end GetThreadInfo */
1347
1348
1349 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
1350 // owned_monitor_count_ptr - pre-checked for NULL
1351 // owned_monitors_ptr - pre-checked for NULL
1352 jvmtiError
1353 JvmtiEnv::GetOwnedMonitorInfo(jthread thread, jint* owned_monitor_count_ptr, jobject** owned_monitors_ptr) {
1354 JavaThread* calling_thread = JavaThread::current();
1355 HandleMark hm(calling_thread);
1356
1357 // growable array of jvmti monitors info on the C-heap
1358 GrowableArray<jvmtiMonitorStackDepthInfo*> *owned_monitors_list =
1359 new (mtServiceability) GrowableArray<jvmtiMonitorStackDepthInfo*>(1, mtServiceability);
1360
1361 JvmtiVTMSTransitionDisabler disabler;
1362 ThreadsListHandle tlh(calling_thread);
1363
1364 JavaThread* java_thread = NULL;
1365 oop thread_oop = NULL;
1366 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, &java_thread, &thread_oop);
1367 if (err != JVMTI_ERROR_NONE) {
1368 delete owned_monitors_list;
1369 return err;
1370 }
1371
1372 if (java_lang_VirtualThread::is_instance(thread_oop)) {
1373 // There is no monitor info to collect if target virtual thread is unmounted.
1374 if (java_thread != NULL) {
1375 VirtualThreadGetOwnedMonitorInfoClosure op(this,
1376 Handle(calling_thread, thread_oop),
1377 owned_monitors_list);
1378 Handshake::execute(&op, java_thread);
1379 err = op.result();
1380 }
1381 } else {
1382 EscapeBarrier eb(true, calling_thread, java_thread);
1383 if (!eb.deoptimize_objects(MaxJavaStackTraceDepth)) {
1384 delete owned_monitors_list;
1385 return JVMTI_ERROR_OUT_OF_MEMORY;
1386 }
1387
1388 if (java_thread == calling_thread) {
1389 // It is only safe to make a direct call on the current thread.
1390 // All other usage needs to use a direct handshake for safety.
1391 err = get_owned_monitors(calling_thread, java_thread, owned_monitors_list);
1392 } else {
1393 // get owned monitors info with handshake
1394 GetOwnedMonitorInfoClosure op(calling_thread, this, owned_monitors_list);
1395 Handshake::execute(&op, java_thread);
1396 err = op.result();
1397 }
1398 }
1399
1400 jint owned_monitor_count = owned_monitors_list->length();
1401 if (err == JVMTI_ERROR_NONE) {
1402 if ((err = allocate(owned_monitor_count * sizeof(jobject *),
1403 (unsigned char**)owned_monitors_ptr)) == JVMTI_ERROR_NONE) {
1404 // copy into the returned array
1405 for (int i = 0; i < owned_monitor_count; i++) {
1406 (*owned_monitors_ptr)[i] =
1407 ((jvmtiMonitorStackDepthInfo*)owned_monitors_list->at(i))->monitor;
1408 }
1409 *owned_monitor_count_ptr = owned_monitor_count;
1410 }
1411 }
1412 // clean up.
1413 for (int i = 0; i < owned_monitor_count; i++) {
1414 deallocate((unsigned char*)owned_monitors_list->at(i));
1415 }
1416 delete owned_monitors_list;
1417
1418 return err;
1419 } /* end GetOwnedMonitorInfo */
1420
1421
1422 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
1423 // monitor_info_count_ptr - pre-checked for NULL
1424 // monitor_info_ptr - pre-checked for NULL
1425 jvmtiError
1426 JvmtiEnv::GetOwnedMonitorStackDepthInfo(jthread thread, jint* monitor_info_count_ptr, jvmtiMonitorStackDepthInfo** monitor_info_ptr) {
1427 JavaThread* calling_thread = JavaThread::current();
1428 HandleMark hm(calling_thread);
1429
1430 // growable array of jvmti monitors info on the C-heap
1431 GrowableArray<jvmtiMonitorStackDepthInfo*> *owned_monitors_list =
1432 new (mtServiceability) GrowableArray<jvmtiMonitorStackDepthInfo*>(1, mtServiceability);
1433
1434 JvmtiVTMSTransitionDisabler disabler;
1435 ThreadsListHandle tlh(calling_thread);
1436
1437 JavaThread* java_thread = NULL;
1438 oop thread_oop = NULL;
1439 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, &java_thread, &thread_oop);
1440 if (err != JVMTI_ERROR_NONE) {
1441 delete owned_monitors_list;
1442 return err;
1443 }
1444
1445 if (java_lang_VirtualThread::is_instance(thread_oop)) {
1446 // There is no monitor info to collect if target virtual thread is unmounted.
1447 if (java_thread != NULL) {
1448 VirtualThreadGetOwnedMonitorInfoClosure op(this,
1449 Handle(calling_thread, thread_oop),
1450 owned_monitors_list);
1451 Handshake::execute(&op, java_thread);
1452 err = op.result();
1453 }
1454 } else {
1455 EscapeBarrier eb(true, calling_thread, java_thread);
1456 if (!eb.deoptimize_objects(MaxJavaStackTraceDepth)) {
1457 delete owned_monitors_list;
1458 return JVMTI_ERROR_OUT_OF_MEMORY;
1459 }
1460
1461 if (java_thread == calling_thread) {
1462 // It is only safe to make a direct call on the current thread.
1463 // All other usage needs to use a direct handshake for safety.
1464 err = get_owned_monitors(calling_thread, java_thread, owned_monitors_list);
1465 } else {
1466 // get owned monitors info with handshake
1467 GetOwnedMonitorInfoClosure op(calling_thread, this, owned_monitors_list);
1468 Handshake::execute(&op, java_thread);
1469 err = op.result();
1470 }
1471 }
1472 jint owned_monitor_count = owned_monitors_list->length();
1473 if (err == JVMTI_ERROR_NONE) {
1474 if ((err = allocate(owned_monitor_count * sizeof(jvmtiMonitorStackDepthInfo),
1475 (unsigned char**)monitor_info_ptr)) == JVMTI_ERROR_NONE) {
1476 // copy to output array.
1477 for (int i = 0; i < owned_monitor_count; i++) {
1478 (*monitor_info_ptr)[i].monitor =
1479 ((jvmtiMonitorStackDepthInfo*)owned_monitors_list->at(i))->monitor;
1480 (*monitor_info_ptr)[i].stack_depth =
1481 ((jvmtiMonitorStackDepthInfo*)owned_monitors_list->at(i))->stack_depth;
1482 }
1483 }
1484 *monitor_info_count_ptr = owned_monitor_count;
1485 }
1486
1487 // clean up.
1488 for (int i = 0; i < owned_monitor_count; i++) {
1489 deallocate((unsigned char*)owned_monitors_list->at(i));
1490 }
1491 delete owned_monitors_list;
1492
1493 return err;
1494 } /* end GetOwnedMonitorStackDepthInfo */
1495
1496
1497 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
1498 // monitor_ptr - pre-checked for NULL
1499 jvmtiError
1500 JvmtiEnv::GetCurrentContendedMonitor(jthread thread, jobject* monitor_ptr) {
1501 JavaThread* calling_thread = JavaThread::current();
1502 HandleMark hm(calling_thread);
1503
1504 JvmtiVTMSTransitionDisabler disabler;
1505 ThreadsListHandle tlh(calling_thread);
1506
1507 JavaThread* java_thread = NULL;
1508 oop thread_oop = NULL;
1509 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, &java_thread, &thread_oop);
1510 if (err != JVMTI_ERROR_NONE) {
1511 return err;
1512 }
1513
1514 if (java_lang_VirtualThread::is_instance(thread_oop)) {
1515 // There is no monitor info to collect if target virtual thread is unmounted.
1516 if (java_thread != NULL) {
1517 GetCurrentContendedMonitorClosure op(calling_thread, this, monitor_ptr, /* is_virtual */ true);
1518 Handshake::execute(&op, java_thread);
1519 err = op.result();
1520 } else {
1521 *monitor_ptr = NULL;
1522 if (!JvmtiEnvBase::is_vthread_alive(thread_oop)) {
1523 err = JVMTI_ERROR_THREAD_NOT_ALIVE;
1524 }
1525 }
1526 return err;
1527 }
1528 if (java_thread == calling_thread) {
1529 // It is only safe to make a direct call on the current thread.
1530 // All other usage needs to use a direct handshake for safety.
1531 err = get_current_contended_monitor(calling_thread, java_thread, monitor_ptr, /* is_virtual */ false);
1532 } else {
1533 // get contended monitor information with handshake
1534 GetCurrentContendedMonitorClosure op(calling_thread, this, monitor_ptr, /* is_virtual */ false);
1535 Handshake::execute(&op, java_thread);
1536 err = op.result();
1537 }
1538 return err;
1539 } /* end GetCurrentContendedMonitor */
1540
1541
1542 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
1543 // proc - pre-checked for NULL
1544 // arg - NULL is a valid value, must be checked
1545 jvmtiError
1546 JvmtiEnv::RunAgentThread(jthread thread, jvmtiStartFunction proc, const void* arg, jint priority) {
1547 JavaThread* current_thread = JavaThread::current();
1548
1549 JavaThread* java_thread = NULL;
1550 oop thread_oop = NULL;
1551 ThreadsListHandle tlh(current_thread);
1552 jvmtiError err = JvmtiExport::cv_external_thread_to_JavaThread(tlh.list(), thread, &java_thread, &thread_oop);
1553 if (err != JVMTI_ERROR_NONE) {
1554 // We got an error code so we don't have a JavaThread *, but
1555 // only return an error from here if we didn't get a valid
1556 // thread_oop.
1557 if (thread_oop == NULL) {
1558 return err;
1559 }
1560 // We have a valid thread_oop.
1561 }
1562
1563 if (java_thread != NULL) {
1564 // 'thread' refers to an existing JavaThread.
1565 return JVMTI_ERROR_INVALID_THREAD;
1566 }
1567 if (java_lang_VirtualThread::is_instance(thread_oop)) {
1568 // No support for virtual threads.
1569 return JVMTI_ERROR_UNSUPPORTED_OPERATION;
1570 }
1571
1572 if (priority < JVMTI_THREAD_MIN_PRIORITY || priority > JVMTI_THREAD_MAX_PRIORITY) {
1573 return JVMTI_ERROR_INVALID_PRIORITY;
1574 }
1575
1576 Handle thread_hndl(current_thread, thread_oop);
1577
1578 JvmtiAgentThread* new_thread = new JvmtiAgentThread(this, proc, arg);
1579
1580 // At this point it may be possible that no osthread was created for the
1581 // JavaThread due to lack of resources.
1582 if (new_thread->osthread() == NULL) {
1583 // The new thread is not known to Thread-SMR yet so we can just delete.
1584 delete new_thread;
1585 return JVMTI_ERROR_OUT_OF_MEMORY;
1586 }
1587
1588 JavaThread::start_internal_daemon(current_thread, new_thread, thread_hndl,
1589 (ThreadPriority)priority);
1590
1591 return JVMTI_ERROR_NONE;
1592 } /* end RunAgentThread */
1593
1594 //
1595 // Thread Group functions
1596 //
1597
1598 // group_count_ptr - pre-checked for NULL
1599 // groups_ptr - pre-checked for NULL
1600 jvmtiError
1601 JvmtiEnv::GetTopThreadGroups(jint* group_count_ptr, jthreadGroup** groups_ptr) {
1602 JavaThread* current_thread = JavaThread::current();
1603
1604 // Only one top level thread group now.
1605 *group_count_ptr = 1;
1606
1607 // Allocate memory to store global-refs to the thread groups.
1608 // Assume this area is freed by caller.
1609 *groups_ptr = (jthreadGroup *) jvmtiMalloc((sizeof(jthreadGroup)) * (*group_count_ptr));
1610
1611 NULL_CHECK(*groups_ptr, JVMTI_ERROR_OUT_OF_MEMORY);
1612
1613 // Convert oop to Handle, then convert Handle to global-ref.
1614 {
1615 HandleMark hm(current_thread);
1616 Handle system_thread_group(current_thread, Universe::system_thread_group());
1617 *groups_ptr[0] = jni_reference(system_thread_group);
1618 }
1619
1620 return JVMTI_ERROR_NONE;
1621 } /* end GetTopThreadGroups */
1622
1623
1624 // info_ptr - pre-checked for NULL
1625 jvmtiError
1626 JvmtiEnv::GetThreadGroupInfo(jthreadGroup group, jvmtiThreadGroupInfo* info_ptr) {
1627 Thread* current_thread = Thread::current();
1628 ResourceMark rm(current_thread);
1629 HandleMark hm(current_thread);
1630
1631 Handle group_obj (current_thread, JNIHandles::resolve_external_guard(group));
1632 NULL_CHECK(group_obj(), JVMTI_ERROR_INVALID_THREAD_GROUP);
1633
1634 const char* name;
1635 Handle parent_group;
1636 bool is_daemon;
1637 ThreadPriority max_priority;
1638
1639 name = java_lang_ThreadGroup::name(group_obj());
1640 parent_group = Handle(current_thread, java_lang_ThreadGroup::parent(group_obj()));
1641 is_daemon = java_lang_ThreadGroup::is_daemon(group_obj());
1642 max_priority = java_lang_ThreadGroup::maxPriority(group_obj());
1643
1644 info_ptr->is_daemon = is_daemon;
1645 info_ptr->max_priority = max_priority;
1646 info_ptr->parent = jni_reference(parent_group);
1647
1648 if (name != NULL) {
1649 info_ptr->name = (char*)jvmtiMalloc(strlen(name)+1);
1650 NULL_CHECK(info_ptr->name, JVMTI_ERROR_OUT_OF_MEMORY);
1651 strcpy(info_ptr->name, name);
1652 } else {
1653 info_ptr->name = NULL;
1654 }
1655
1656 return JVMTI_ERROR_NONE;
1657 } /* end GetThreadGroupInfo */
1658
1659 // thread_count_ptr - pre-checked for NULL
1660 // threads_ptr - pre-checked for NULL
1661 // group_count_ptr - pre-checked for NULL
1662 // groups_ptr - pre-checked for NULL
1663 jvmtiError
1664 JvmtiEnv::GetThreadGroupChildren(jthreadGroup group, jint* thread_count_ptr, jthread** threads_ptr, jint* group_count_ptr, jthreadGroup** groups_ptr) {
1665 jvmtiError err;
1666 JavaThread* current_thread = JavaThread::current();
1667 oop group_obj = JNIHandles::resolve_external_guard(group);
1668 NULL_CHECK(group_obj, JVMTI_ERROR_INVALID_THREAD_GROUP);
1669
1670 Handle *thread_objs = NULL;
1671 objArrayHandle group_objs;
1672 jint nthreads = 0;
1673 jint ngroups = 0;
1674 int hidden_threads = 0;
1675
1676 ResourceMark rm(current_thread);
1677 HandleMark hm(current_thread);
1678
1679 Handle group_hdl(current_thread, group_obj);
1680
1681 err = get_live_threads(current_thread, group_hdl, &nthreads, &thread_objs);
1682 if (err != JVMTI_ERROR_NONE) {
1683 return err;
1684 }
1685 err = get_subgroups(current_thread, group_hdl, &ngroups, &group_objs);
1686 if (err != JVMTI_ERROR_NONE) {
1687 return err;
1688 }
1689
1690 *group_count_ptr = ngroups;
1691 *thread_count_ptr = nthreads;
1692 *threads_ptr = new_jthreadArray(nthreads, thread_objs);
1693 *groups_ptr = new_jthreadGroupArray(ngroups, group_objs);
1694 if (nthreads > 0 && *threads_ptr == NULL) {
1695 return JVMTI_ERROR_OUT_OF_MEMORY;
1696 }
1697 if (ngroups > 0 && *groups_ptr == NULL) {
1698 return JVMTI_ERROR_OUT_OF_MEMORY;
1699 }
1700
1701 return JVMTI_ERROR_NONE;
1702 } /* end GetThreadGroupChildren */
1703
1704
1705 //
1706 // Stack Frame functions
1707 //
1708
1709 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
1710 // max_frame_count - pre-checked to be greater than or equal to 0
1711 // frame_buffer - pre-checked for NULL
1712 // count_ptr - pre-checked for NULL
1713 jvmtiError
1714 JvmtiEnv::GetStackTrace(jthread thread, jint start_depth, jint max_frame_count, jvmtiFrameInfo* frame_buffer, jint* count_ptr) {
1715 JavaThread* current_thread = JavaThread::current();
1716 HandleMark hm(current_thread);
1717
1718 JvmtiVTMSTransitionDisabler disabler;
1719 ThreadsListHandle tlh(current_thread);
1720
1721 JavaThread* java_thread = NULL;
1722 oop thread_obj = NULL;
1723 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, &java_thread, &thread_obj);
1724 if (err != JVMTI_ERROR_NONE) {
1725 return err;
1726 }
1727
1728 if (java_lang_VirtualThread::is_instance(thread_obj)) {
1729 if (java_thread == NULL) { // Target virtual thread is unmounted.
1730 ResourceMark rm(current_thread);
1731
1732 VM_VirtualThreadGetStackTrace op(this, Handle(current_thread, thread_obj),
1733 start_depth, max_frame_count,
1734 frame_buffer, count_ptr);
1735 VMThread::execute(&op);
1736 return op.result();
1737 }
1738 VirtualThreadGetStackTraceClosure op(this, Handle(current_thread, thread_obj),
1739 start_depth, max_frame_count, frame_buffer, count_ptr);
1740 Handshake::execute(&op, java_thread);
1741 return op.result();
1742 }
1743
1744 // It is only safe to perform the direct operation on the current
1745 // thread. All other usage needs to use a direct handshake for safety.
1746 if (java_thread == JavaThread::current()) {
1747 err = get_stack_trace(java_thread, start_depth, max_frame_count, frame_buffer, count_ptr);
1748 } else {
1749 // Get stack trace with handshake.
1750 GetStackTraceClosure op(this, start_depth, max_frame_count, frame_buffer, count_ptr);
1751 Handshake::execute(&op, java_thread);
1752 err = op.result();
1753 }
1754
1755 return err;
1756 } /* end GetStackTrace */
1757
1758
1759 // max_frame_count - pre-checked to be greater than or equal to 0
1760 // stack_info_ptr - pre-checked for NULL
1761 // thread_count_ptr - pre-checked for NULL
1762 jvmtiError
1763 JvmtiEnv::GetAllStackTraces(jint max_frame_count, jvmtiStackInfo** stack_info_ptr, jint* thread_count_ptr) {
1764 jvmtiError err = JVMTI_ERROR_NONE;
1765 JavaThread* calling_thread = JavaThread::current();
1766
1767 // JVMTI get stack traces at safepoint.
1768 VM_GetAllStackTraces op(this, calling_thread, max_frame_count);
1769 VMThread::execute(&op);
1770 *thread_count_ptr = op.final_thread_count();
1771 *stack_info_ptr = op.stack_info();
1772 err = op.result();
1773 return err;
1774 } /* end GetAllStackTraces */
1775
1776
1777 // thread_count - pre-checked to be greater than or equal to 0
1778 // thread_list - pre-checked for NULL
1779 // max_frame_count - pre-checked to be greater than or equal to 0
1780 // stack_info_ptr - pre-checked for NULL
1781 jvmtiError
1782 JvmtiEnv::GetThreadListStackTraces(jint thread_count, const jthread* thread_list, jint max_frame_count, jvmtiStackInfo** stack_info_ptr) {
1783 jvmtiError err = JVMTI_ERROR_NONE;
1784
1785 if (thread_count == 1) {
1786 JvmtiVTMSTransitionDisabler disabler;
1787
1788 // Use direct handshake if we need to get only one stack trace.
1789 JavaThread *current_thread = JavaThread::current();
1790 ThreadsListHandle tlh(current_thread);
1791
1792 jthread thread = thread_list[0];
1793 JavaThread *java_thread;
1794 oop thread_obj = NULL;
1795 err = get_threadOop_and_JavaThread(tlh.list(), thread, &java_thread, &thread_obj);
1796 if (err != JVMTI_ERROR_NONE) {
1797 return err;
1798 }
1799
1800 if (java_lang_VirtualThread::is_instance(thread_obj) && java_thread == NULL) {
1801 // Target virtual thread is unmounted.
1802 ResourceMark rm(current_thread);
1803 MultipleStackTracesCollector collector(this, max_frame_count);
1804 collector.fill_frames(thread, java_thread, thread_obj);
1805 collector.allocate_and_fill_stacks(/* thread_count */ 1);
1806 *stack_info_ptr = collector.stack_info();
1807 return collector.result();
1808 }
1809
1810 GetSingleStackTraceClosure op(this, current_thread, thread, max_frame_count);
1811 Handshake::execute(&op, &tlh, java_thread);
1812 err = op.result();
1813 if (err == JVMTI_ERROR_NONE) {
1814 *stack_info_ptr = op.stack_info();
1815 }
1816 } else {
1817 // JVMTI get stack traces at safepoint.
1818 VM_GetThreadListStackTraces op(this, thread_count, thread_list, max_frame_count);
1819 VMThread::execute(&op);
1820 err = op.result();
1821 if (err == JVMTI_ERROR_NONE) {
1822 *stack_info_ptr = op.stack_info();
1823 }
1824 }
1825 return err;
1826 } /* end GetThreadListStackTraces */
1827
1828
1829 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
1830 // count_ptr - pre-checked for NULL
1831 jvmtiError
1832 JvmtiEnv::GetFrameCount(jthread thread, jint* count_ptr) {
1833 JavaThread* current_thread = JavaThread::current();
1834 HandleMark hm(current_thread);
1835
1836 JvmtiVTMSTransitionDisabler disabler;
1837 ThreadsListHandle tlh(current_thread);
1838
1839 JavaThread* java_thread = NULL;
1840 oop thread_obj = NULL;
1841 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, &java_thread, &thread_obj);
1842 if (err != JVMTI_ERROR_NONE) {
1843 return err;
1844 }
1845
1846 if (java_lang_VirtualThread::is_instance(thread_obj)) {
1847 if (java_thread == NULL) { // Target virtual thread is unmounted.
1848 VM_VirtualThreadGetFrameCount op(this, Handle(current_thread, thread_obj), count_ptr);
1849 VMThread::execute(&op);
1850 return op.result();
1851 }
1852 VirtualThreadGetFrameCountClosure op(this, Handle(current_thread, thread_obj), count_ptr);
1853 Handshake::execute(&op, java_thread);
1854 return op.result();
1855 }
1856
1857 // It is only safe to perform the direct operation on the current
1858 // thread. All other usage needs to use a direct handshake for safety.
1859 if (java_thread == JavaThread::current()) {
1860 err = get_frame_count(java_thread, count_ptr);
1861 } else {
1862 // get java stack frame count with handshake.
1863 GetFrameCountClosure op(this, count_ptr);
1864 Handshake::execute(&op, java_thread);
1865 err = op.result();
1866 }
1867 return err;
1868 } /* end GetFrameCount */
1869
1870
1871 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
1872 jvmtiError
1873 JvmtiEnv::PopFrame(jthread thread) {
1874 JavaThread* current_thread = JavaThread::current();
1875 HandleMark hm(current_thread);
1876
1877 if (thread == NULL) {
1878 return JVMTI_ERROR_INVALID_THREAD;
1879 }
1880 JvmtiVTMSTransitionDisabler disabler;
1881 ThreadsListHandle tlh(current_thread);
1882
1883 JavaThread* java_thread = NULL;
1884 oop thread_obj = NULL;
1885 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, &java_thread, &thread_obj);
1886
1887 if (thread_obj != NULL && java_lang_VirtualThread::is_instance(thread_obj)) {
1888 // No support for virtual threads (yet).
1889 return JVMTI_ERROR_OPAQUE_FRAME;
1890 }
1891 if (err != JVMTI_ERROR_NONE) {
1892 return err;
1893 }
1894
1895 // retrieve or create the state
1896 JvmtiThreadState* state = JvmtiThreadState::state_for(java_thread);
1897 if (state == NULL) {
1898 return JVMTI_ERROR_THREAD_NOT_ALIVE;
1899 }
1900
1901 // Eagerly reallocate scalar replaced objects.
1902 EscapeBarrier eb(true, current_thread, java_thread);
1903 if (!eb.deoptimize_objects(1)) {
1904 // Reallocation of scalar replaced objects failed -> return with error
1905 return JVMTI_ERROR_OUT_OF_MEMORY;
1906 }
1907
1908 MutexLocker mu(JvmtiThreadState_lock);
1909 UpdateForPopTopFrameClosure op(state);
1910 if (java_thread == current_thread) {
1911 op.doit(java_thread, true /* self */);
1912 } else {
1913 Handshake::execute(&op, java_thread);
1914 }
1915 return op.result();
1916 } /* end PopFrame */
1917
1918
1919 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
1920 // depth - pre-checked as non-negative
1921 // method_ptr - pre-checked for NULL
1922 // location_ptr - pre-checked for NULL
1923 jvmtiError
1924 JvmtiEnv::GetFrameLocation(jthread thread, jint depth, jmethodID* method_ptr, jlocation* location_ptr) {
1925 JavaThread* current_thread = JavaThread::current();
1926 HandleMark hm(current_thread);
1927
1928 JvmtiVTMSTransitionDisabler disabler;
1929 ThreadsListHandle tlh(current_thread);
1930
1931 JavaThread* java_thread = NULL;
1932 oop thread_obj = NULL;
1933 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, &java_thread, &thread_obj);
1934 if (err != JVMTI_ERROR_NONE) {
1935 return err;
1936 }
1937
1938 if (java_lang_VirtualThread::is_instance(thread_obj)) {
1939 if (java_thread == NULL) { // Target virtual thread is unmounted.
1940 err = get_frame_location(thread_obj, depth, method_ptr, location_ptr);
1941 return err;
1942 }
1943 VirtualThreadGetFrameLocationClosure op(this, Handle(current_thread, thread_obj),
1944 depth, method_ptr, location_ptr);
1945 Handshake::execute(&op, java_thread);
1946 return op.result();
1947 }
1948
1949 // It is only safe to perform the direct operation on the current
1950 // thread. All other usage needs to use a direct handshake for safety.
1951 if (java_thread == JavaThread::current()) {
1952 err = get_frame_location(java_thread, depth, method_ptr, location_ptr);
1953 } else {
1954 // JVMTI get java stack frame location via direct handshake.
1955 GetFrameLocationClosure op(this, depth, method_ptr, location_ptr);
1956 Handshake::execute(&op, java_thread);
1957 err = op.result();
1958 }
1959 return err;
1960 } /* end GetFrameLocation */
1961
1962
1963 // Threads_lock NOT held, java_thread not protected by lock
1964 // depth - pre-checked as non-negative
1965 jvmtiError
1966 JvmtiEnv::NotifyFramePop(jthread thread, jint depth) {
1967 ResourceMark rm;
1968 JvmtiVTMSTransitionDisabler disabler;
1969 ThreadsListHandle tlh;
1970
1971 JavaThread* java_thread = NULL;
1972 oop thread_obj = NULL;
1973 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, &java_thread, &thread_obj);
1974 if (err != JVMTI_ERROR_NONE) {
1975 return err;
1976 }
1977
1978 JavaThread* current = JavaThread::current();
1979 HandleMark hm(current);
1980 Handle thread_handle(current, thread_obj);
1981 JvmtiThreadState *state = JvmtiThreadState::state_for(java_thread, thread_handle);
1982 if (state == NULL) {
1983 return JVMTI_ERROR_THREAD_NOT_ALIVE;
1984 }
1985
1986 if (java_lang_VirtualThread::is_instance(thread_handle())) {
1987 VirtualThreadSetFramePopClosure op(this, thread_handle, state, depth);
1988 MutexLocker mu(current, JvmtiThreadState_lock);
1989 if (java_thread == NULL || java_thread == current) {
1990 // Target virtual thread is unmounted or current.
1991 op.doit(java_thread, true /* self */);
1992 } else {
1993 Handshake::execute(&op, java_thread);
1994 }
1995 return op.result();
1996 }
1997
1998 SetFramePopClosure op(this, state, depth);
1999 MutexLocker mu(current, JvmtiThreadState_lock);
2000 if (java_thread == current) {
2001 op.doit(java_thread, true /* self */);
2002 } else {
2003 Handshake::execute(&op, java_thread);
2004 }
2005 return op.result();
2006 } /* end NotifyFramePop */
2007
2008
2009 //
2010 // Force Early Return functions
2011 //
2012
2013 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
2014 jvmtiError
2015 JvmtiEnv::ForceEarlyReturnObject(jthread thread, jobject value) {
2016 jvalue val;
2017 val.l = value;
2018 return force_early_return(thread, val, atos);
2019 } /* end ForceEarlyReturnObject */
2020
2021
2022 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
2023 jvmtiError
2024 JvmtiEnv::ForceEarlyReturnInt(jthread thread, jint value) {
2025 jvalue val;
2026 val.i = value;
2027 return force_early_return(thread, val, itos);
2028 } /* end ForceEarlyReturnInt */
2029
2030
2031 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
2032 jvmtiError
2033 JvmtiEnv::ForceEarlyReturnLong(jthread thread, jlong value) {
2034 jvalue val;
2035 val.j = value;
2036 return force_early_return(thread, val, ltos);
2037 } /* end ForceEarlyReturnLong */
2038
2039
2040 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
2041 jvmtiError
2042 JvmtiEnv::ForceEarlyReturnFloat(jthread thread, jfloat value) {
2043 jvalue val;
2044 val.f = value;
2045 return force_early_return(thread, val, ftos);
2046 } /* end ForceEarlyReturnFloat */
2047
2048
2049 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
2050 jvmtiError
2051 JvmtiEnv::ForceEarlyReturnDouble(jthread thread, jdouble value) {
2052 jvalue val;
2053 val.d = value;
2054 return force_early_return(thread, val, dtos);
2055 } /* end ForceEarlyReturnDouble */
2056
2057
2058 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
2059 jvmtiError
2060 JvmtiEnv::ForceEarlyReturnVoid(jthread thread) {
2061 jvalue val;
2062 val.j = 0L;
2063 return force_early_return(thread, val, vtos);
2064 } /* end ForceEarlyReturnVoid */
2065
2066
2067 //
2068 // Heap functions
2069 //
2070
2071 // klass - NULL is a valid value, must be checked
2072 // initial_object - NULL is a valid value, must be checked
2073 // callbacks - pre-checked for NULL
2074 // user_data - NULL is a valid value, must be checked
2075 jvmtiError
2076 JvmtiEnv::FollowReferences(jint heap_filter, jclass klass, jobject initial_object, const jvmtiHeapCallbacks* callbacks, const void* user_data) {
2077 // check klass if provided
2078 Klass* k = NULL;
2079 if (klass != NULL) {
2080 oop k_mirror = JNIHandles::resolve_external_guard(klass);
2081 if (k_mirror == NULL) {
2082 return JVMTI_ERROR_INVALID_CLASS;
2083 }
2084 if (java_lang_Class::is_primitive(k_mirror)) {
2085 return JVMTI_ERROR_NONE;
2086 }
2087 k = java_lang_Class::as_Klass(k_mirror);
2088 if (klass == NULL) {
2089 return JVMTI_ERROR_INVALID_CLASS;
2090 }
2091 }
2092
2093 if (initial_object != NULL) {
2094 oop init_obj = JNIHandles::resolve_external_guard(initial_object);
2095 if (init_obj == NULL) {
2096 return JVMTI_ERROR_INVALID_OBJECT;
2097 }
2098 }
2099
2100 Thread *thread = Thread::current();
2101 HandleMark hm(thread);
2102
2103 TraceTime t("FollowReferences", TRACETIME_LOG(Debug, jvmti, objecttagging));
2104 JvmtiTagMap::tag_map_for(this)->follow_references(heap_filter, k, initial_object, callbacks, user_data);
2105 return JVMTI_ERROR_NONE;
2106 } /* end FollowReferences */
2107
2108
2109 // klass - NULL is a valid value, must be checked
2110 // callbacks - pre-checked for NULL
2111 // user_data - NULL is a valid value, must be checked
2112 jvmtiError
2113 JvmtiEnv::IterateThroughHeap(jint heap_filter, jclass klass, const jvmtiHeapCallbacks* callbacks, const void* user_data) {
2114 // check klass if provided
2115 Klass* k = NULL;
2116 if (klass != NULL) {
2117 oop k_mirror = JNIHandles::resolve_external_guard(klass);
2118 if (k_mirror == NULL) {
2119 return JVMTI_ERROR_INVALID_CLASS;
2120 }
2121 if (java_lang_Class::is_primitive(k_mirror)) {
2122 return JVMTI_ERROR_NONE;
2123 }
2124 k = java_lang_Class::as_Klass(k_mirror);
2125 if (k == NULL) {
2126 return JVMTI_ERROR_INVALID_CLASS;
2127 }
2128 }
2129
2130 TraceTime t("IterateThroughHeap", TRACETIME_LOG(Debug, jvmti, objecttagging));
2131 JvmtiTagMap::tag_map_for(this)->iterate_through_heap(heap_filter, k, callbacks, user_data);
2132 return JVMTI_ERROR_NONE;
2133 } /* end IterateThroughHeap */
2134
2135
2136 // tag_ptr - pre-checked for NULL
2137 jvmtiError
2138 JvmtiEnv::GetTag(jobject object, jlong* tag_ptr) {
2139 oop o = JNIHandles::resolve_external_guard(object);
2140 NULL_CHECK(o, JVMTI_ERROR_INVALID_OBJECT);
2141 *tag_ptr = JvmtiTagMap::tag_map_for(this)->get_tag(object);
2142 return JVMTI_ERROR_NONE;
2143 } /* end GetTag */
2144
2145
2146 jvmtiError
2147 JvmtiEnv::SetTag(jobject object, jlong tag) {
2148 oop o = JNIHandles::resolve_external_guard(object);
2149 NULL_CHECK(o, JVMTI_ERROR_INVALID_OBJECT);
2150 JvmtiTagMap::tag_map_for(this)->set_tag(object, tag);
2151 return JVMTI_ERROR_NONE;
2152 } /* end SetTag */
2153
2154
2155 // tag_count - pre-checked to be greater than or equal to 0
2156 // tags - pre-checked for NULL
2157 // count_ptr - pre-checked for NULL
2158 // object_result_ptr - NULL is a valid value, must be checked
2159 // tag_result_ptr - NULL is a valid value, must be checked
2160 jvmtiError
2161 JvmtiEnv::GetObjectsWithTags(jint tag_count, const jlong* tags, jint* count_ptr, jobject** object_result_ptr, jlong** tag_result_ptr) {
2162 TraceTime t("GetObjectsWithTags", TRACETIME_LOG(Debug, jvmti, objecttagging));
2163 return JvmtiTagMap::tag_map_for(this)->get_objects_with_tags((jlong*)tags, tag_count, count_ptr, object_result_ptr, tag_result_ptr);
2164 } /* end GetObjectsWithTags */
2165
2166
2167 jvmtiError
2168 JvmtiEnv::ForceGarbageCollection() {
2169 Universe::heap()->collect(GCCause::_jvmti_force_gc);
2170 return JVMTI_ERROR_NONE;
2171 } /* end ForceGarbageCollection */
2172
2173
2174 //
2175 // Heap (1.0) functions
2176 //
2177
2178 // object_reference_callback - pre-checked for NULL
2179 // user_data - NULL is a valid value, must be checked
2180 jvmtiError
2181 JvmtiEnv::IterateOverObjectsReachableFromObject(jobject object, jvmtiObjectReferenceCallback object_reference_callback, const void* user_data) {
2182 oop o = JNIHandles::resolve_external_guard(object);
2183 NULL_CHECK(o, JVMTI_ERROR_INVALID_OBJECT);
2184 JvmtiTagMap::tag_map_for(this)->iterate_over_objects_reachable_from_object(object, object_reference_callback, user_data);
2185 return JVMTI_ERROR_NONE;
2186 } /* end IterateOverObjectsReachableFromObject */
2187
2188
2189 // heap_root_callback - NULL is a valid value, must be checked
2190 // stack_ref_callback - NULL is a valid value, must be checked
2191 // object_ref_callback - NULL is a valid value, must be checked
2192 // user_data - NULL is a valid value, must be checked
2193 jvmtiError
2194 JvmtiEnv::IterateOverReachableObjects(jvmtiHeapRootCallback heap_root_callback, jvmtiStackReferenceCallback stack_ref_callback, jvmtiObjectReferenceCallback object_ref_callback, const void* user_data) {
2195 TraceTime t("IterateOverReachableObjects", TRACETIME_LOG(Debug, jvmti, objecttagging));
2196 JvmtiTagMap::tag_map_for(this)->iterate_over_reachable_objects(heap_root_callback, stack_ref_callback, object_ref_callback, user_data);
2197 return JVMTI_ERROR_NONE;
2198 } /* end IterateOverReachableObjects */
2199
2200
2201 // heap_object_callback - pre-checked for NULL
2202 // user_data - NULL is a valid value, must be checked
2203 jvmtiError
2204 JvmtiEnv::IterateOverHeap(jvmtiHeapObjectFilter object_filter, jvmtiHeapObjectCallback heap_object_callback, const void* user_data) {
2205 TraceTime t("IterateOverHeap", TRACETIME_LOG(Debug, jvmti, objecttagging));
2206 Thread *thread = Thread::current();
2207 HandleMark hm(thread);
2208 JvmtiTagMap::tag_map_for(this)->iterate_over_heap(object_filter, NULL, heap_object_callback, user_data);
2209 return JVMTI_ERROR_NONE;
2210 } /* end IterateOverHeap */
2211
2212
2213 // k_mirror - may be primitive, this must be checked
2214 // heap_object_callback - pre-checked for NULL
2215 // user_data - NULL is a valid value, must be checked
2216 jvmtiError
2217 JvmtiEnv::IterateOverInstancesOfClass(oop k_mirror, jvmtiHeapObjectFilter object_filter, jvmtiHeapObjectCallback heap_object_callback, const void* user_data) {
2218 if (java_lang_Class::is_primitive(k_mirror)) {
2219 // DO PRIMITIVE CLASS PROCESSING
2220 return JVMTI_ERROR_NONE;
2221 }
2222 Klass* klass = java_lang_Class::as_Klass(k_mirror);
2223 if (klass == NULL) {
2224 return JVMTI_ERROR_INVALID_CLASS;
2225 }
2226 TraceTime t("IterateOverInstancesOfClass", TRACETIME_LOG(Debug, jvmti, objecttagging));
2227 JvmtiTagMap::tag_map_for(this)->iterate_over_heap(object_filter, klass, heap_object_callback, user_data);
2228 return JVMTI_ERROR_NONE;
2229 } /* end IterateOverInstancesOfClass */
2230
2231
2232 //
2233 // Local Variable functions
2234 //
2235
2236 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
2237 // depth - pre-checked as non-negative
2238 // value_ptr - pre-checked for NULL
2239 jvmtiError
2240 JvmtiEnv::GetLocalObject(jthread thread, jint depth, jint slot, jobject* value_ptr) {
2241 JavaThread* current_thread = JavaThread::current();
2242 // rm object is created to clean up the javaVFrame created in
2243 // doit_prologue(), but after doit() is finished with it.
2244 ResourceMark rm(current_thread);
2245 HandleMark hm(current_thread);
2246 JvmtiVTMSTransitionDisabler disabler;
2247 ThreadsListHandle tlh(current_thread);
2248
2249 JavaThread* java_thread = NULL;
2250 oop thread_obj = NULL;
2251 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, &java_thread, &thread_obj);
2252 if (err != JVMTI_ERROR_NONE) {
2253 return err;
2254 }
2255 bool self = is_JavaThread_current(java_thread, thread_obj);
2256
2257 if (java_lang_VirtualThread::is_instance(thread_obj)) {
2258 VM_VirtualThreadGetOrSetLocal op(this, Handle(current_thread, thread_obj),
2259 current_thread, depth, slot, self);
2260 VMThread::execute(&op);
2261 err = op.result();
2262 if (err == JVMTI_ERROR_NONE) {
2263 *value_ptr = op.value().l;
2264 }
2265 } else {
2266 // Support for ordinary threads
2267 VM_GetOrSetLocal op(java_thread, current_thread, depth, slot, self);
2268 VMThread::execute(&op);
2269 err = op.result();
2270 if (err == JVMTI_ERROR_NONE) {
2271 *value_ptr = op.value().l;
2272 }
2273 }
2274 return err;
2275 } /* end GetLocalObject */
2276
2277 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
2278 // depth - pre-checked as non-negative
2279 // value - pre-checked for NULL
2280 jvmtiError
2281 JvmtiEnv::GetLocalInstance(jthread thread, jint depth, jobject* value_ptr){
2282 JavaThread* current_thread = JavaThread::current();
2283 // rm object is created to clean up the javaVFrame created in
2284 // doit_prologue(), but after doit() is finished with it.
2285 ResourceMark rm(current_thread);
2286 HandleMark hm(current_thread);
2287 JvmtiVTMSTransitionDisabler disabler;
2288 ThreadsListHandle tlh(current_thread);
2289
2290 JavaThread* java_thread = NULL;
2291 oop thread_obj = NULL;
2292 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, &java_thread, &thread_obj);
2293 if (err != JVMTI_ERROR_NONE) {
2294 return err;
2295 }
2296 bool self = is_JavaThread_current(java_thread, thread_obj);
2297
2298 if (java_lang_VirtualThread::is_instance(thread_obj)) {
2299 VM_VirtualThreadGetReceiver op(this, Handle(current_thread, thread_obj),
2300 current_thread, depth, self);
2301 VMThread::execute(&op);
2302 err = op.result();
2303 if (err == JVMTI_ERROR_NONE) {
2304 *value_ptr = op.value().l;
2305 }
2306 } else {
2307 // Support for ordinary threads
2308 VM_GetReceiver op(java_thread, current_thread, depth, self);
2309 VMThread::execute(&op);
2310 err = op.result();
2311 if (err == JVMTI_ERROR_NONE) {
2312 *value_ptr = op.value().l;
2313 }
2314 }
2315 return err;
2316 } /* end GetLocalInstance */
2317
2318
2319 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
2320 // depth - pre-checked as non-negative
2321 // value_ptr - pre-checked for NULL
2322 jvmtiError
2323 JvmtiEnv::GetLocalInt(jthread thread, jint depth, jint slot, jint* value_ptr) {
2324 JavaThread* current_thread = JavaThread::current();
2325 // rm object is created to clean up the javaVFrame created in
2326 // doit_prologue(), but after doit() is finished with it.
2327 ResourceMark rm(current_thread);
2328 HandleMark hm(current_thread);
2329 JvmtiVTMSTransitionDisabler disabler;
2330 ThreadsListHandle tlh(current_thread);
2331
2332 JavaThread* java_thread = NULL;
2333 oop thread_obj = NULL;
2334 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, &java_thread, &thread_obj);
2335 if (err != JVMTI_ERROR_NONE) {
2336 return err;
2337 }
2338 bool self = is_JavaThread_current(java_thread, thread_obj);
2339
2340 if (java_lang_VirtualThread::is_instance(thread_obj)) {
2341 VM_VirtualThreadGetOrSetLocal op(this, Handle(current_thread, thread_obj),
2342 depth, slot, T_INT, self);
2343 VMThread::execute(&op);
2344 err = op.result();
2345 if (err == JVMTI_ERROR_NONE) {
2346 *value_ptr = op.value().i;
2347 }
2348 } else {
2349 // Support for ordinary threads
2350 VM_GetOrSetLocal op(java_thread, depth, slot, T_INT, self);
2351 VMThread::execute(&op);
2352 err = op.result();
2353 if (err == JVMTI_ERROR_NONE) {
2354 *value_ptr = op.value().i;
2355 }
2356 }
2357 return err;
2358 } /* end GetLocalInt */
2359
2360
2361 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
2362 // depth - pre-checked as non-negative
2363 // value_ptr - pre-checked for NULL
2364 jvmtiError
2365 JvmtiEnv::GetLocalLong(jthread thread, jint depth, jint slot, jlong* value_ptr) {
2366 JavaThread* current_thread = JavaThread::current();
2367 // rm object is created to clean up the javaVFrame created in
2368 // doit_prologue(), but after doit() is finished with it.
2369 ResourceMark rm(current_thread);
2370 HandleMark hm(current_thread);
2371 JvmtiVTMSTransitionDisabler disabler;
2372 ThreadsListHandle tlh(current_thread);
2373
2374 JavaThread* java_thread = NULL;
2375 oop thread_obj = NULL;
2376 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, &java_thread, &thread_obj);
2377 if (err != JVMTI_ERROR_NONE) {
2378 return err;
2379 }
2380 bool self = is_JavaThread_current(java_thread, thread_obj);
2381
2382 if (java_lang_VirtualThread::is_instance(thread_obj)) {
2383 VM_VirtualThreadGetOrSetLocal op(this, Handle(current_thread, thread_obj),
2384 depth, slot, T_LONG, self);
2385 VMThread::execute(&op);
2386 err = op.result();
2387 if (err == JVMTI_ERROR_NONE) {
2388 *value_ptr = op.value().j;
2389 }
2390 } else {
2391 // Support for ordinary threads
2392 VM_GetOrSetLocal op(java_thread, depth, slot, T_LONG, self);
2393 VMThread::execute(&op);
2394 err = op.result();
2395 if (err == JVMTI_ERROR_NONE) {
2396 *value_ptr = op.value().j;
2397 }
2398 }
2399 return err;
2400 } /* end GetLocalLong */
2401
2402
2403 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
2404 // depth - pre-checked as non-negative
2405 // value_ptr - pre-checked for NULL
2406 jvmtiError
2407 JvmtiEnv::GetLocalFloat(jthread thread, jint depth, jint slot, jfloat* value_ptr) {
2408 JavaThread* current_thread = JavaThread::current();
2409 // rm object is created to clean up the javaVFrame created in
2410 // doit_prologue(), but after doit() is finished with it.
2411 ResourceMark rm(current_thread);
2412 HandleMark hm(current_thread);
2413 JvmtiVTMSTransitionDisabler disabler;
2414 ThreadsListHandle tlh(current_thread);
2415
2416 JavaThread* java_thread = NULL;
2417 oop thread_obj = NULL;
2418 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, &java_thread, &thread_obj);
2419 if (err != JVMTI_ERROR_NONE) {
2420 return err;
2421 }
2422 bool self = is_JavaThread_current(java_thread, thread_obj);
2423
2424 if (java_lang_VirtualThread::is_instance(thread_obj)) {
2425 VM_VirtualThreadGetOrSetLocal op(this, Handle(current_thread, thread_obj),
2426 depth, slot, T_FLOAT, self);
2427 VMThread::execute(&op);
2428 err = op.result();
2429 if (err == JVMTI_ERROR_NONE) {
2430 *value_ptr = op.value().f;
2431 }
2432 } else {
2433 // Support for ordinary threads
2434 VM_GetOrSetLocal op(java_thread, depth, slot, T_FLOAT, self);
2435 VMThread::execute(&op);
2436 err = op.result();
2437 if (err == JVMTI_ERROR_NONE) {
2438 *value_ptr = op.value().f;
2439 }
2440 }
2441 return err;
2442 } /* end GetLocalFloat */
2443
2444
2445 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
2446 // depth - pre-checked as non-negative
2447 // value_ptr - pre-checked for NULL
2448 jvmtiError
2449 JvmtiEnv::GetLocalDouble(jthread thread, jint depth, jint slot, jdouble* value_ptr) {
2450 JavaThread* current_thread = JavaThread::current();
2451 // rm object is created to clean up the javaVFrame created in
2452 // doit_prologue(), but after doit() is finished with it.
2453 ResourceMark rm(current_thread);
2454 HandleMark hm(current_thread);
2455 JvmtiVTMSTransitionDisabler disabler;
2456 ThreadsListHandle tlh(current_thread);
2457
2458 JavaThread* java_thread = NULL;
2459 oop thread_obj = NULL;
2460 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, &java_thread, &thread_obj);
2461 if (err != JVMTI_ERROR_NONE) {
2462 return err;
2463 }
2464 bool self = is_JavaThread_current(java_thread, thread_obj);
2465
2466 if (java_lang_VirtualThread::is_instance(thread_obj)) {
2467 VM_VirtualThreadGetOrSetLocal op(this, Handle(current_thread, thread_obj),
2468 depth, slot, T_DOUBLE, self);
2469 VMThread::execute(&op);
2470 err = op.result();
2471 if (err == JVMTI_ERROR_NONE) {
2472 *value_ptr = op.value().d;
2473 }
2474 } else {
2475 // Support for ordinary threads
2476 VM_GetOrSetLocal op(java_thread, depth, slot, T_DOUBLE, self);
2477 VMThread::execute(&op);
2478 err = op.result();
2479 if (err == JVMTI_ERROR_NONE) {
2480 *value_ptr = op.value().d;
2481 }
2482 }
2483 return err;
2484 } /* end GetLocalDouble */
2485
2486
2487 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
2488 // depth - pre-checked as non-negative
2489 jvmtiError
2490 JvmtiEnv::SetLocalObject(jthread thread, jint depth, jint slot, jobject value) {
2491 JavaThread* current_thread = JavaThread::current();
2492 // rm object is created to clean up the javaVFrame created in
2493 // doit_prologue(), but after doit() is finished with it.
2494 ResourceMark rm(current_thread);
2495 HandleMark hm(current_thread);
2496 JvmtiVTMSTransitionDisabler disabler;
2497 ThreadsListHandle tlh(current_thread);
2498
2499 JavaThread* java_thread = NULL;
2500 oop thread_obj = NULL;
2501 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, &java_thread, &thread_obj);
2502 if (err != JVMTI_ERROR_NONE) {
2503 return err;
2504 }
2505 bool self = is_JavaThread_current(java_thread, thread_obj);
2506 jvalue val;
2507 val.l = value;
2508
2509 if (java_lang_VirtualThread::is_instance(thread_obj)) {
2510 VM_VirtualThreadGetOrSetLocal op(this, Handle(current_thread, thread_obj),
2511 depth, slot, T_OBJECT, val, self);
2512 VMThread::execute(&op);
2513 err = op.result();
2514 } else {
2515 // Support for ordinary threads
2516 VM_GetOrSetLocal op(java_thread, depth, slot, T_OBJECT, val, self);
2517 VMThread::execute(&op);
2518 err = op.result();
2519 }
2520 return err;
2521 } /* end SetLocalObject */
2522
2523
2524 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
2525 // depth - pre-checked as non-negative
2526 jvmtiError
2527 JvmtiEnv::SetLocalInt(jthread thread, jint depth, jint slot, jint value) {
2528 JavaThread* current_thread = JavaThread::current();
2529 // rm object is created to clean up the javaVFrame created in
2530 // doit_prologue(), but after doit() is finished with it.
2531 ResourceMark rm(current_thread);
2532 HandleMark hm(current_thread);
2533 JvmtiVTMSTransitionDisabler disabler;
2534 ThreadsListHandle tlh(current_thread);
2535
2536 JavaThread* java_thread = NULL;
2537 oop thread_obj = NULL;
2538 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, &java_thread, &thread_obj);
2539 if (err != JVMTI_ERROR_NONE) {
2540 return err;
2541 }
2542 bool self = is_JavaThread_current(java_thread, thread_obj);
2543 jvalue val;
2544 val.i = value;
2545
2546 if (java_lang_VirtualThread::is_instance(thread_obj)) {
2547 VM_VirtualThreadGetOrSetLocal op(this, Handle(current_thread, thread_obj),
2548 depth, slot, T_INT, val, self);
2549 VMThread::execute(&op);
2550 err = op.result();
2551 } else {
2552 // Support for ordinary threads
2553 VM_GetOrSetLocal op(java_thread, depth, slot, T_INT, val, self);
2554 VMThread::execute(&op);
2555 err = op.result();
2556 }
2557 return err;
2558 } /* end SetLocalInt */
2559
2560
2561 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
2562 // depth - pre-checked as non-negative
2563 jvmtiError
2564 JvmtiEnv::SetLocalLong(jthread thread, jint depth, jint slot, jlong value) {
2565 JavaThread* current_thread = JavaThread::current();
2566 // rm object is created to clean up the javaVFrame created in
2567 // doit_prologue(), but after doit() is finished with it.
2568 ResourceMark rm(current_thread);
2569 HandleMark hm(current_thread);
2570 JvmtiVTMSTransitionDisabler disabler;
2571 ThreadsListHandle tlh(current_thread);
2572
2573 JavaThread* java_thread = NULL;
2574 oop thread_obj = NULL;
2575 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, &java_thread, &thread_obj);
2576 if (err != JVMTI_ERROR_NONE) {
2577 return err;
2578 }
2579 bool self = is_JavaThread_current(java_thread, thread_obj);
2580 jvalue val;
2581 val.j = value;
2582
2583 if (java_lang_VirtualThread::is_instance(thread_obj)) {
2584 VM_VirtualThreadGetOrSetLocal op(this, Handle(current_thread, thread_obj),
2585 depth, slot, T_LONG, val, self);
2586 VMThread::execute(&op);
2587 err = op.result();
2588 } else {
2589 // Support for ordinary threads
2590 VM_GetOrSetLocal op(java_thread, depth, slot, T_LONG, val, self);
2591 VMThread::execute(&op);
2592 err = op.result();
2593 }
2594 return err;
2595 } /* end SetLocalLong */
2596
2597
2598 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
2599 // depth - pre-checked as non-negative
2600 jvmtiError
2601 JvmtiEnv::SetLocalFloat(jthread thread, jint depth, jint slot, jfloat value) {
2602 JavaThread* current_thread = JavaThread::current();
2603 // rm object is created to clean up the javaVFrame created in
2604 // doit_prologue(), but after doit() is finished with it.
2605 ResourceMark rm(current_thread);
2606 HandleMark hm(current_thread);
2607 JvmtiVTMSTransitionDisabler disabler;
2608 ThreadsListHandle tlh(current_thread);
2609
2610 JavaThread* java_thread = NULL;
2611 oop thread_obj = NULL;
2612 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, &java_thread, &thread_obj);
2613 if (err != JVMTI_ERROR_NONE) {
2614 return err;
2615 }
2616 bool self = is_JavaThread_current(java_thread, thread_obj);
2617 jvalue val;
2618 val.f = value;
2619
2620 if (java_lang_VirtualThread::is_instance(thread_obj)) {
2621 VM_VirtualThreadGetOrSetLocal op(this, Handle(current_thread, thread_obj),
2622 depth, slot, T_FLOAT, val, self);
2623 VMThread::execute(&op);
2624 err = op.result();
2625 } else {
2626 // Support for ordinary threads
2627 VM_GetOrSetLocal op(java_thread, depth, slot, T_FLOAT, val, self);
2628 VMThread::execute(&op);
2629 err = op.result();
2630 }
2631 return err;
2632 } /* end SetLocalFloat */
2633
2634
2635 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
2636 // depth - pre-checked as non-negative
2637 jvmtiError
2638 JvmtiEnv::SetLocalDouble(jthread thread, jint depth, jint slot, jdouble value) {
2639 JavaThread* current_thread = JavaThread::current();
2640 // rm object is created to clean up the javaVFrame created in
2641 // doit_prologue(), but after doit() is finished with it.
2642 ResourceMark rm(current_thread);
2643 HandleMark hm(current_thread);
2644 JvmtiVTMSTransitionDisabler disabler;
2645 ThreadsListHandle tlh(current_thread);
2646
2647 JavaThread* java_thread = NULL;
2648 oop thread_obj = NULL;
2649 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, &java_thread, &thread_obj);
2650 if (err != JVMTI_ERROR_NONE) {
2651 return err;
2652 }
2653 bool self = is_JavaThread_current(java_thread, thread_obj);
2654 jvalue val;
2655 val.d = value;
2656
2657 if (java_lang_VirtualThread::is_instance(thread_obj)) {
2658 VM_VirtualThreadGetOrSetLocal op(this, Handle(current_thread, thread_obj),
2659 depth, slot, T_DOUBLE, val, self);
2660 VMThread::execute(&op);
2661 err = op.result();
2662 } else {
2663 // Support for ordinary threads
2664 VM_GetOrSetLocal op(java_thread, depth, slot, T_DOUBLE, val, self);
2665 VMThread::execute(&op);
2666 err = op.result();
2667 }
2668 return err;
2669 } /* end SetLocalDouble */
2670
2671
2672 //
2673 // Breakpoint functions
2674 //
2675
2676 // method - pre-checked for validity, but may be NULL meaning obsolete method
2677 jvmtiError
2678 JvmtiEnv::SetBreakpoint(Method* method, jlocation location) {
2679 NULL_CHECK(method, JVMTI_ERROR_INVALID_METHODID);
2680 if (location < 0) { // simple invalid location check first
2681 return JVMTI_ERROR_INVALID_LOCATION;
2682 }
2683 // verify that the breakpoint is not past the end of the method
2684 if (location >= (jlocation) method->code_size()) {
2685 return JVMTI_ERROR_INVALID_LOCATION;
2686 }
2687
2688 ResourceMark rm;
2689 JvmtiBreakpoint bp(method, location);
2690 JvmtiBreakpoints& jvmti_breakpoints = JvmtiCurrentBreakpoints::get_jvmti_breakpoints();
2691 if (jvmti_breakpoints.set(bp) == JVMTI_ERROR_DUPLICATE)
2692 return JVMTI_ERROR_DUPLICATE;
2693
2694 if (TraceJVMTICalls) {
2695 jvmti_breakpoints.print();
2696 }
2697
2698 return JVMTI_ERROR_NONE;
2699 } /* end SetBreakpoint */
2700
2701
2702 // method - pre-checked for validity, but may be NULL meaning obsolete method
2703 jvmtiError
2704 JvmtiEnv::ClearBreakpoint(Method* method, jlocation location) {
2705 NULL_CHECK(method, JVMTI_ERROR_INVALID_METHODID);
2706
2707 if (location < 0) { // simple invalid location check first
2708 return JVMTI_ERROR_INVALID_LOCATION;
2709 }
2710
2711 // verify that the breakpoint is not past the end of the method
2712 if (location >= (jlocation) method->code_size()) {
2713 return JVMTI_ERROR_INVALID_LOCATION;
2714 }
2715
2716 JvmtiBreakpoint bp(method, location);
2717
2718 JvmtiBreakpoints& jvmti_breakpoints = JvmtiCurrentBreakpoints::get_jvmti_breakpoints();
2719 if (jvmti_breakpoints.clear(bp) == JVMTI_ERROR_NOT_FOUND)
2720 return JVMTI_ERROR_NOT_FOUND;
2721
2722 if (TraceJVMTICalls) {
2723 jvmti_breakpoints.print();
2724 }
2725
2726 return JVMTI_ERROR_NONE;
2727 } /* end ClearBreakpoint */
2728
2729
2730 //
2731 // Watched Field functions
2732 //
2733
2734 jvmtiError
2735 JvmtiEnv::SetFieldAccessWatch(fieldDescriptor* fdesc_ptr) {
2736 // make sure we haven't set this watch before
2737 if (fdesc_ptr->is_field_access_watched()) return JVMTI_ERROR_DUPLICATE;
2738 fdesc_ptr->set_is_field_access_watched(true);
2739
2740 JvmtiEventController::change_field_watch(JVMTI_EVENT_FIELD_ACCESS, true);
2741
2742 return JVMTI_ERROR_NONE;
2743 } /* end SetFieldAccessWatch */
2744
2745
2746 jvmtiError
2747 JvmtiEnv::ClearFieldAccessWatch(fieldDescriptor* fdesc_ptr) {
2748 // make sure we have a watch to clear
2749 if (!fdesc_ptr->is_field_access_watched()) return JVMTI_ERROR_NOT_FOUND;
2750 fdesc_ptr->set_is_field_access_watched(false);
2751
2752 JvmtiEventController::change_field_watch(JVMTI_EVENT_FIELD_ACCESS, false);
2753
2754 return JVMTI_ERROR_NONE;
2755 } /* end ClearFieldAccessWatch */
2756
2757
2758 jvmtiError
2759 JvmtiEnv::SetFieldModificationWatch(fieldDescriptor* fdesc_ptr) {
2760 // make sure we haven't set this watch before
2761 if (fdesc_ptr->is_field_modification_watched()) return JVMTI_ERROR_DUPLICATE;
2762 fdesc_ptr->set_is_field_modification_watched(true);
2763
2764 JvmtiEventController::change_field_watch(JVMTI_EVENT_FIELD_MODIFICATION, true);
2765
2766 return JVMTI_ERROR_NONE;
2767 } /* end SetFieldModificationWatch */
2768
2769
2770 jvmtiError
2771 JvmtiEnv::ClearFieldModificationWatch(fieldDescriptor* fdesc_ptr) {
2772 // make sure we have a watch to clear
2773 if (!fdesc_ptr->is_field_modification_watched()) return JVMTI_ERROR_NOT_FOUND;
2774 fdesc_ptr->set_is_field_modification_watched(false);
2775
2776 JvmtiEventController::change_field_watch(JVMTI_EVENT_FIELD_MODIFICATION, false);
2777
2778 return JVMTI_ERROR_NONE;
2779 } /* end ClearFieldModificationWatch */
2780
2781 //
2782 // Class functions
2783 //
2784
2785
2786 // k_mirror - may be primitive, this must be checked
2787 // signature_ptr - NULL is a valid value, must be checked
2788 // generic_ptr - NULL is a valid value, must be checked
2789 jvmtiError
2790 JvmtiEnv::GetClassSignature(oop k_mirror, char** signature_ptr, char** generic_ptr) {
2791 ResourceMark rm;
2792 bool isPrimitive = java_lang_Class::is_primitive(k_mirror);
2793 Klass* k = NULL;
2794 if (!isPrimitive) {
2795 k = java_lang_Class::as_Klass(k_mirror);
2796 NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS);
2797 }
2798 if (signature_ptr != NULL) {
2799 char* result = NULL;
2800 if (isPrimitive) {
2801 char tchar = type2char(java_lang_Class::primitive_type(k_mirror));
2802 result = (char*) jvmtiMalloc(2);
2803 result[0] = tchar;
2804 result[1] = '\0';
2805 } else {
2806 const char* class_sig = k->signature_name();
2807 result = (char *) jvmtiMalloc(strlen(class_sig)+1);
2808 strcpy(result, class_sig);
2809 }
2810 *signature_ptr = result;
2811 }
2812 if (generic_ptr != NULL) {
2813 *generic_ptr = NULL;
2814 if (!isPrimitive && k->is_instance_klass()) {
2815 Symbol* soo = InstanceKlass::cast(k)->generic_signature();
2816 if (soo != NULL) {
2817 const char *gen_sig = soo->as_C_string();
2818 if (gen_sig != NULL) {
2819 char* gen_result;
2820 jvmtiError err = allocate(strlen(gen_sig) + 1,
2821 (unsigned char **)&gen_result);
2822 if (err != JVMTI_ERROR_NONE) {
2823 return err;
2824 }
2825 strcpy(gen_result, gen_sig);
2826 *generic_ptr = gen_result;
2827 }
2828 }
2829 }
2830 }
2831 return JVMTI_ERROR_NONE;
2832 } /* end GetClassSignature */
2833
2834
2835 // k_mirror - may be primitive, this must be checked
2836 // status_ptr - pre-checked for NULL
2837 jvmtiError
2838 JvmtiEnv::GetClassStatus(oop k_mirror, jint* status_ptr) {
2839 jint result = 0;
2840 if (java_lang_Class::is_primitive(k_mirror)) {
2841 result |= JVMTI_CLASS_STATUS_PRIMITIVE;
2842 } else {
2843 Klass* k = java_lang_Class::as_Klass(k_mirror);
2844 NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS);
2845 result = k->jvmti_class_status();
2846 }
2847 *status_ptr = result;
2848
2849 return JVMTI_ERROR_NONE;
2850 } /* end GetClassStatus */
2851
2852
2853 // k_mirror - may be primitive, this must be checked
2854 // source_name_ptr - pre-checked for NULL
2855 jvmtiError
2856 JvmtiEnv::GetSourceFileName(oop k_mirror, char** source_name_ptr) {
2857 if (java_lang_Class::is_primitive(k_mirror)) {
2858 return JVMTI_ERROR_ABSENT_INFORMATION;
2859 }
2860 Klass* k_klass = java_lang_Class::as_Klass(k_mirror);
2861 NULL_CHECK(k_klass, JVMTI_ERROR_INVALID_CLASS);
2862
2863 if (!k_klass->is_instance_klass()) {
2864 return JVMTI_ERROR_ABSENT_INFORMATION;
2865 }
2866
2867 Symbol* sfnOop = InstanceKlass::cast(k_klass)->source_file_name();
2868 NULL_CHECK(sfnOop, JVMTI_ERROR_ABSENT_INFORMATION);
2869 {
2870 JavaThread* current_thread = JavaThread::current();
2871 ResourceMark rm(current_thread);
2872 const char* sfncp = (const char*) sfnOop->as_C_string();
2873 *source_name_ptr = (char *) jvmtiMalloc(strlen(sfncp)+1);
2874 strcpy(*source_name_ptr, sfncp);
2875 }
2876
2877 return JVMTI_ERROR_NONE;
2878 } /* end GetSourceFileName */
2879
2880
2881 // k_mirror - may be primitive, this must be checked
2882 // modifiers_ptr - pre-checked for NULL
2883 jvmtiError
2884 JvmtiEnv::GetClassModifiers(oop k_mirror, jint* modifiers_ptr) {
2885 JavaThread* current_thread = JavaThread::current();
2886 jint result = 0;
2887 if (!java_lang_Class::is_primitive(k_mirror)) {
2888 Klass* k = java_lang_Class::as_Klass(k_mirror);
2889 NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS);
2890 result = k->compute_modifier_flags();
2891
2892 // Reset the deleted ACC_SUPER bit (deleted in compute_modifier_flags()).
2893 // if (k->is_super()) {
2894 // result |= JVM_ACC_SUPER;
2895 // }
2896 } else {
2897 result = (JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC);
2898 }
2899 *modifiers_ptr = result;
2900
2901 return JVMTI_ERROR_NONE;
2902 } /* end GetClassModifiers */
2903
2904
2905 // k_mirror - may be primitive, this must be checked
2906 // method_count_ptr - pre-checked for NULL
2907 // methods_ptr - pre-checked for NULL
2908 jvmtiError
2909 JvmtiEnv::GetClassMethods(oop k_mirror, jint* method_count_ptr, jmethodID** methods_ptr) {
2910 JavaThread* current_thread = JavaThread::current();
2911 HandleMark hm(current_thread);
2912
2913 if (java_lang_Class::is_primitive(k_mirror)) {
2914 *method_count_ptr = 0;
2915 *methods_ptr = (jmethodID*) jvmtiMalloc(0 * sizeof(jmethodID));
2916 return JVMTI_ERROR_NONE;
2917 }
2918 Klass* k = java_lang_Class::as_Klass(k_mirror);
2919 NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS);
2920
2921 // Return CLASS_NOT_PREPARED error as per JVMTI spec.
2922 if (!(k->jvmti_class_status() & (JVMTI_CLASS_STATUS_PREPARED|JVMTI_CLASS_STATUS_ARRAY) )) {
2923 return JVMTI_ERROR_CLASS_NOT_PREPARED;
2924 }
2925
2926 if (!k->is_instance_klass()) {
2927 *method_count_ptr = 0;
2928 *methods_ptr = (jmethodID*) jvmtiMalloc(0 * sizeof(jmethodID));
2929 return JVMTI_ERROR_NONE;
2930 }
2931 InstanceKlass* ik = InstanceKlass::cast(k);
2932 // Allocate the result and fill it in
2933 int result_length = ik->methods()->length();
2934 jmethodID* result_list = (jmethodID*)jvmtiMalloc(result_length * sizeof(jmethodID));
2935 int index;
2936 bool jmethodids_found = true;
2937 int skipped = 0; // skip overpass methods
2938
2939 for (index = 0; index < result_length; index++) {
2940 Method* m = ik->methods()->at(index);
2941 // Depending on can_maintain_original_method_order capability use the original
2942 // method ordering indices stored in the class, so we can emit jmethodIDs in
2943 // the order they appeared in the class file or just copy in current order.
2944 int result_index = JvmtiExport::can_maintain_original_method_order() ? ik->method_ordering()->at(index) : index;
2945 assert(result_index >= 0 && result_index < result_length, "invalid original method index");
2946 if (m->is_overpass()) {
2947 result_list[result_index] = NULL;
2948 skipped++;
2949 continue;
2950 }
2951 jmethodID id;
2952 if (jmethodids_found) {
2953 id = m->find_jmethod_id_or_null();
2954 if (id == NULL) {
2955 // If we find an uninitialized value, make sure there is
2956 // enough space for all the uninitialized values we might
2957 // find.
2958 ik->ensure_space_for_methodids(index);
2959 jmethodids_found = false;
2960 id = m->jmethod_id();
2961 }
2962 } else {
2963 id = m->jmethod_id();
2964 }
2965 result_list[result_index] = id;
2966 }
2967
2968 // Fill in return value.
2969 if (skipped > 0) {
2970 // copy results skipping NULL methodIDs
2971 *methods_ptr = (jmethodID*)jvmtiMalloc((result_length - skipped) * sizeof(jmethodID));
2972 *method_count_ptr = result_length - skipped;
2973 for (index = 0, skipped = 0; index < result_length; index++) {
2974 if (result_list[index] == NULL) {
2975 skipped++;
2976 } else {
2977 (*methods_ptr)[index - skipped] = result_list[index];
2978 }
2979 }
2980 deallocate((unsigned char *)result_list);
2981 } else {
2982 *method_count_ptr = result_length;
2983 *methods_ptr = result_list;
2984 }
2985
2986 return JVMTI_ERROR_NONE;
2987 } /* end GetClassMethods */
2988
2989
2990 // k_mirror - may be primitive, this must be checked
2991 // field_count_ptr - pre-checked for NULL
2992 // fields_ptr - pre-checked for NULL
2993 jvmtiError
2994 JvmtiEnv::GetClassFields(oop k_mirror, jint* field_count_ptr, jfieldID** fields_ptr) {
2995 if (java_lang_Class::is_primitive(k_mirror)) {
2996 *field_count_ptr = 0;
2997 *fields_ptr = (jfieldID*) jvmtiMalloc(0 * sizeof(jfieldID));
2998 return JVMTI_ERROR_NONE;
2999 }
3000 JavaThread* current_thread = JavaThread::current();
3001 HandleMark hm(current_thread);
3002 Klass* k = java_lang_Class::as_Klass(k_mirror);
3003 NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS);
3004
3005 // Return CLASS_NOT_PREPARED error as per JVMTI spec.
3006 if (!(k->jvmti_class_status() & (JVMTI_CLASS_STATUS_PREPARED|JVMTI_CLASS_STATUS_ARRAY) )) {
3007 return JVMTI_ERROR_CLASS_NOT_PREPARED;
3008 }
3009
3010 if (!k->is_instance_klass()) {
3011 *field_count_ptr = 0;
3012 *fields_ptr = (jfieldID*) jvmtiMalloc(0 * sizeof(jfieldID));
3013 return JVMTI_ERROR_NONE;
3014 }
3015
3016
3017 InstanceKlass* ik = InstanceKlass::cast(k);
3018
3019 int result_count = 0;
3020 // First, count the fields.
3021 FilteredFieldStream flds(ik, true, true);
3022 result_count = flds.field_count();
3023
3024 // Allocate the result and fill it in
3025 jfieldID* result_list = (jfieldID*) jvmtiMalloc(result_count * sizeof(jfieldID));
3026 // The JVMTI spec requires fields in the order they occur in the class file,
3027 // this is the reverse order of what FieldStream hands out.
3028 int id_index = (result_count - 1);
3029
3030 for (FilteredFieldStream src_st(ik, true, true); !src_st.eos(); src_st.next()) {
3031 result_list[id_index--] = jfieldIDWorkaround::to_jfieldID(
3032 ik, src_st.offset(),
3033 src_st.access_flags().is_static(),
3034 src_st.field_descriptor().is_inlined());
3035 }
3036 assert(id_index == -1, "just checking");
3037 // Fill in the results
3038 *field_count_ptr = result_count;
3039 *fields_ptr = result_list;
3040
3041 return JVMTI_ERROR_NONE;
3042 } /* end GetClassFields */
3043
3044
3045 // k_mirror - may be primitive, this must be checked
3046 // interface_count_ptr - pre-checked for NULL
3047 // interfaces_ptr - pre-checked for NULL
3048 jvmtiError
3049 JvmtiEnv::GetImplementedInterfaces(oop k_mirror, jint* interface_count_ptr, jclass** interfaces_ptr) {
3050 {
3051 if (java_lang_Class::is_primitive(k_mirror)) {
3052 *interface_count_ptr = 0;
3053 *interfaces_ptr = (jclass*) jvmtiMalloc(0 * sizeof(jclass));
3054 return JVMTI_ERROR_NONE;
3055 }
3056 JavaThread* current_thread = JavaThread::current();
3057 HandleMark hm(current_thread);
3058 Klass* k = java_lang_Class::as_Klass(k_mirror);
3059 NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS);
3060
3061 // Return CLASS_NOT_PREPARED error as per JVMTI spec.
3062 if (!(k->jvmti_class_status() & (JVMTI_CLASS_STATUS_PREPARED|JVMTI_CLASS_STATUS_ARRAY) ))
3063 return JVMTI_ERROR_CLASS_NOT_PREPARED;
3064
3065 if (!k->is_instance_klass()) {
3066 *interface_count_ptr = 0;
3067 *interfaces_ptr = (jclass*) jvmtiMalloc(0 * sizeof(jclass));
3068 return JVMTI_ERROR_NONE;
3069 }
3070
3071 InstanceKlass* ik = InstanceKlass::cast(k);
3072 Array<InstanceKlass*>* interface_list = ik->local_interfaces();
3073 int result_length = (interface_list == NULL ? 0 : interface_list->length());
3074 jclass* result_list = (jclass*) jvmtiMalloc(result_length * sizeof(jclass));
3075 for (int i_index = 0; i_index < result_length; i_index += 1) {
3076 InstanceKlass* klass_at = interface_list->at(i_index);
3077 assert(klass_at->is_klass(), "interfaces must be Klass*s");
3078 assert(klass_at->is_interface(), "interfaces must be interfaces");
3079 oop mirror_at = klass_at->java_mirror();
3080 Handle handle_at = Handle(current_thread, mirror_at);
3081 result_list[i_index] = (jclass) jni_reference(handle_at);
3082 }
3083 *interface_count_ptr = result_length;
3084 *interfaces_ptr = result_list;
3085 }
3086
3087 return JVMTI_ERROR_NONE;
3088 } /* end GetImplementedInterfaces */
3089
3090
3091 // k_mirror - may be primitive, this must be checked
3092 // minor_version_ptr - pre-checked for NULL
3093 // major_version_ptr - pre-checked for NULL
3094 jvmtiError
3095 JvmtiEnv::GetClassVersionNumbers(oop k_mirror, jint* minor_version_ptr, jint* major_version_ptr) {
3096 if (java_lang_Class::is_primitive(k_mirror)) {
3097 return JVMTI_ERROR_ABSENT_INFORMATION;
3098 }
3099 Klass* klass = java_lang_Class::as_Klass(k_mirror);
3100
3101 jint status = klass->jvmti_class_status();
3102 if (status & (JVMTI_CLASS_STATUS_ERROR)) {
3103 return JVMTI_ERROR_INVALID_CLASS;
3104 }
3105 if (status & (JVMTI_CLASS_STATUS_ARRAY)) {
3106 return JVMTI_ERROR_ABSENT_INFORMATION;
3107 }
3108
3109 InstanceKlass* ik = InstanceKlass::cast(klass);
3110 *minor_version_ptr = ik->minor_version();
3111 *major_version_ptr = ik->major_version();
3112
3113 return JVMTI_ERROR_NONE;
3114 } /* end GetClassVersionNumbers */
3115
3116
3117 // k_mirror - may be primitive, this must be checked
3118 // constant_pool_count_ptr - pre-checked for NULL
3119 // constant_pool_byte_count_ptr - pre-checked for NULL
3120 // constant_pool_bytes_ptr - pre-checked for NULL
3121 jvmtiError
3122 JvmtiEnv::GetConstantPool(oop k_mirror, jint* constant_pool_count_ptr, jint* constant_pool_byte_count_ptr, unsigned char** constant_pool_bytes_ptr) {
3123 if (java_lang_Class::is_primitive(k_mirror)) {
3124 return JVMTI_ERROR_ABSENT_INFORMATION;
3125 }
3126
3127 Klass* klass = java_lang_Class::as_Klass(k_mirror);
3128 Thread *thread = Thread::current();
3129 ResourceMark rm(thread);
3130
3131 jint status = klass->jvmti_class_status();
3132 if (status & (JVMTI_CLASS_STATUS_ERROR)) {
3133 return JVMTI_ERROR_INVALID_CLASS;
3134 }
3135 if (status & (JVMTI_CLASS_STATUS_ARRAY)) {
3136 return JVMTI_ERROR_ABSENT_INFORMATION;
3137 }
3138
3139 InstanceKlass* ik = InstanceKlass::cast(klass);
3140 JvmtiConstantPoolReconstituter reconstituter(ik);
3141 if (reconstituter.get_error() != JVMTI_ERROR_NONE) {
3142 return reconstituter.get_error();
3143 }
3144
3145 unsigned char *cpool_bytes;
3146 int cpool_size = reconstituter.cpool_size();
3147 if (reconstituter.get_error() != JVMTI_ERROR_NONE) {
3148 return reconstituter.get_error();
3149 }
3150 jvmtiError res = allocate(cpool_size, &cpool_bytes);
3151 if (res != JVMTI_ERROR_NONE) {
3152 return res;
3153 }
3154 reconstituter.copy_cpool_bytes(cpool_bytes);
3155 if (reconstituter.get_error() != JVMTI_ERROR_NONE) {
3156 return reconstituter.get_error();
3157 }
3158
3159 constantPoolHandle constants(thread, ik->constants());
3160 *constant_pool_count_ptr = constants->length();
3161 *constant_pool_byte_count_ptr = cpool_size;
3162 *constant_pool_bytes_ptr = cpool_bytes;
3163
3164 return JVMTI_ERROR_NONE;
3165 } /* end GetConstantPool */
3166
3167
3168 // k_mirror - may be primitive, this must be checked
3169 // is_interface_ptr - pre-checked for NULL
3170 jvmtiError
3171 JvmtiEnv::IsInterface(oop k_mirror, jboolean* is_interface_ptr) {
3172 {
3173 bool result = false;
3174 if (!java_lang_Class::is_primitive(k_mirror)) {
3175 Klass* k = java_lang_Class::as_Klass(k_mirror);
3176 if (k != NULL && k->is_interface()) {
3177 result = true;
3178 }
3179 }
3180 *is_interface_ptr = result;
3181 }
3182
3183 return JVMTI_ERROR_NONE;
3184 } /* end IsInterface */
3185
3186
3187 // k_mirror - may be primitive, this must be checked
3188 // is_array_class_ptr - pre-checked for NULL
3189 jvmtiError
3190 JvmtiEnv::IsArrayClass(oop k_mirror, jboolean* is_array_class_ptr) {
3191 {
3192 bool result = false;
3193 if (!java_lang_Class::is_primitive(k_mirror)) {
3194 Klass* k = java_lang_Class::as_Klass(k_mirror);
3195 if (k != NULL && k->is_array_klass()) {
3196 result = true;
3197 }
3198 }
3199 *is_array_class_ptr = result;
3200 }
3201
3202 return JVMTI_ERROR_NONE;
3203 } /* end IsArrayClass */
3204
3205
3206 // k_mirror - may be primitive, this must be checked
3207 // classloader_ptr - pre-checked for NULL
3208 jvmtiError
3209 JvmtiEnv::GetClassLoader(oop k_mirror, jobject* classloader_ptr) {
3210 {
3211 if (java_lang_Class::is_primitive(k_mirror)) {
3212 *classloader_ptr = (jclass) jni_reference(Handle());
3213 return JVMTI_ERROR_NONE;
3214 }
3215 JavaThread* current_thread = JavaThread::current();
3216 HandleMark hm(current_thread);
3217 Klass* k = java_lang_Class::as_Klass(k_mirror);
3218 NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS);
3219
3220 oop result_oop = k->class_loader();
3221 if (result_oop == NULL) {
3222 *classloader_ptr = (jclass) jni_reference(Handle());
3223 return JVMTI_ERROR_NONE;
3224 }
3225 Handle result_handle = Handle(current_thread, result_oop);
3226 jclass result_jnihandle = (jclass) jni_reference(result_handle);
3227 *classloader_ptr = result_jnihandle;
3228 }
3229 return JVMTI_ERROR_NONE;
3230 } /* end GetClassLoader */
3231
3232
3233 // k_mirror - may be primitive, this must be checked
3234 // source_debug_extension_ptr - pre-checked for NULL
3235 jvmtiError
3236 JvmtiEnv::GetSourceDebugExtension(oop k_mirror, char** source_debug_extension_ptr) {
3237 {
3238 if (java_lang_Class::is_primitive(k_mirror)) {
3239 return JVMTI_ERROR_ABSENT_INFORMATION;
3240 }
3241 Klass* k = java_lang_Class::as_Klass(k_mirror);
3242 NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS);
3243 if (!k->is_instance_klass()) {
3244 return JVMTI_ERROR_ABSENT_INFORMATION;
3245 }
3246 const char* sde = InstanceKlass::cast(k)->source_debug_extension();
3247 NULL_CHECK(sde, JVMTI_ERROR_ABSENT_INFORMATION);
3248
3249 {
3250 *source_debug_extension_ptr = (char *) jvmtiMalloc(strlen(sde)+1);
3251 strcpy(*source_debug_extension_ptr, sde);
3252 }
3253 }
3254
3255 return JVMTI_ERROR_NONE;
3256 } /* end GetSourceDebugExtension */
3257
3258 //
3259 // Object functions
3260 //
3261
3262 // hash_code_ptr - pre-checked for NULL
3263 jvmtiError
3264 JvmtiEnv::GetObjectHashCode(jobject object, jint* hash_code_ptr) {
3265 oop mirror = JNIHandles::resolve_external_guard(object);
3266 NULL_CHECK(mirror, JVMTI_ERROR_INVALID_OBJECT);
3267 NULL_CHECK(hash_code_ptr, JVMTI_ERROR_NULL_POINTER);
3268
3269 {
3270 jint result = (jint) mirror->identity_hash();
3271 *hash_code_ptr = result;
3272 }
3273 return JVMTI_ERROR_NONE;
3274 } /* end GetObjectHashCode */
3275
3276
3277 // info_ptr - pre-checked for NULL
3278 jvmtiError
3279 JvmtiEnv::GetObjectMonitorUsage(jobject object, jvmtiMonitorUsage* info_ptr) {
3280 // This needs to be performed at a safepoint to gather stable data
3281 // because monitor owner / waiters might not be suspended.
3282 VM_GetObjectMonitorUsage op(this, JavaThread::current(), object, info_ptr);
3283 VMThread::execute(&op);
3284 return op.result();
3285 } /* end GetObjectMonitorUsage */
3286
3287
3288 //
3289 // Field functions
3290 //
3291
3292 // name_ptr - NULL is a valid value, must be checked
3293 // signature_ptr - NULL is a valid value, must be checked
3294 // generic_ptr - NULL is a valid value, must be checked
3295 jvmtiError
3296 JvmtiEnv::GetFieldName(fieldDescriptor* fdesc_ptr, char** name_ptr, char** signature_ptr, char** generic_ptr) {
3297 JavaThread* current_thread = JavaThread::current();
3298 ResourceMark rm(current_thread);
3299 if (name_ptr == NULL) {
3300 // just don't return the name
3301 } else {
3302 const char* fieldName = fdesc_ptr->name()->as_C_string();
3303 *name_ptr = (char*) jvmtiMalloc(strlen(fieldName) + 1);
3304 if (*name_ptr == NULL)
3305 return JVMTI_ERROR_OUT_OF_MEMORY;
3306 strcpy(*name_ptr, fieldName);
3307 }
3308 if (signature_ptr== NULL) {
3309 // just don't return the signature
3310 } else {
3311 const char* fieldSignature = fdesc_ptr->signature()->as_C_string();
3312 *signature_ptr = (char*) jvmtiMalloc(strlen(fieldSignature) + 1);
3313 if (*signature_ptr == NULL)
3314 return JVMTI_ERROR_OUT_OF_MEMORY;
3315 strcpy(*signature_ptr, fieldSignature);
3316 }
3317 if (generic_ptr != NULL) {
3318 *generic_ptr = NULL;
3319 Symbol* soop = fdesc_ptr->generic_signature();
3320 if (soop != NULL) {
3321 const char* gen_sig = soop->as_C_string();
3322 if (gen_sig != NULL) {
3323 jvmtiError err = allocate(strlen(gen_sig) + 1, (unsigned char **)generic_ptr);
3324 if (err != JVMTI_ERROR_NONE) {
3325 return err;
3326 }
3327 strcpy(*generic_ptr, gen_sig);
3328 }
3329 }
3330 }
3331 return JVMTI_ERROR_NONE;
3332 } /* end GetFieldName */
3333
3334
3335 // declaring_class_ptr - pre-checked for NULL
3336 jvmtiError
3337 JvmtiEnv::GetFieldDeclaringClass(fieldDescriptor* fdesc_ptr, jclass* declaring_class_ptr) {
3338
3339 *declaring_class_ptr = get_jni_class_non_null(fdesc_ptr->field_holder());
3340 return JVMTI_ERROR_NONE;
3341 } /* end GetFieldDeclaringClass */
3342
3343
3344 // modifiers_ptr - pre-checked for NULL
3345 jvmtiError
3346 JvmtiEnv::GetFieldModifiers(fieldDescriptor* fdesc_ptr, jint* modifiers_ptr) {
3347
3348 AccessFlags resultFlags = fdesc_ptr->access_flags();
3349 jint result = resultFlags.as_int();
3350 *modifiers_ptr = result;
3351
3352 return JVMTI_ERROR_NONE;
3353 } /* end GetFieldModifiers */
3354
3355
3356 // is_synthetic_ptr - pre-checked for NULL
3357 jvmtiError
3358 JvmtiEnv::IsFieldSynthetic(fieldDescriptor* fdesc_ptr, jboolean* is_synthetic_ptr) {
3359 *is_synthetic_ptr = fdesc_ptr->is_synthetic();
3360 return JVMTI_ERROR_NONE;
3361 } /* end IsFieldSynthetic */
3362
3363
3364 //
3365 // Method functions
3366 //
3367
3368 // method - pre-checked for validity, but may be NULL meaning obsolete method
3369 // name_ptr - NULL is a valid value, must be checked
3370 // signature_ptr - NULL is a valid value, must be checked
3371 // generic_ptr - NULL is a valid value, must be checked
3372 jvmtiError
3373 JvmtiEnv::GetMethodName(Method* method, char** name_ptr, char** signature_ptr, char** generic_ptr) {
3374 NULL_CHECK(method, JVMTI_ERROR_INVALID_METHODID);
3375 JavaThread* current_thread = JavaThread::current();
3376
3377 ResourceMark rm(current_thread); // get the utf8 name and signature
3378 if (name_ptr == NULL) {
3379 // just don't return the name
3380 } else {
3381 const char* utf8_name = (const char *) method->name()->as_utf8();
3382 *name_ptr = (char *) jvmtiMalloc(strlen(utf8_name)+1);
3383 strcpy(*name_ptr, utf8_name);
3384 }
3385 if (signature_ptr == NULL) {
3386 // just don't return the signature
3387 } else {
3388 const char* utf8_signature = (const char *) method->signature()->as_utf8();
3389 *signature_ptr = (char *) jvmtiMalloc(strlen(utf8_signature) + 1);
3390 strcpy(*signature_ptr, utf8_signature);
3391 }
3392
3393 if (generic_ptr != NULL) {
3394 *generic_ptr = NULL;
3395 Symbol* soop = method->generic_signature();
3396 if (soop != NULL) {
3397 const char* gen_sig = soop->as_C_string();
3398 if (gen_sig != NULL) {
3399 jvmtiError err = allocate(strlen(gen_sig) + 1, (unsigned char **)generic_ptr);
3400 if (err != JVMTI_ERROR_NONE) {
3401 return err;
3402 }
3403 strcpy(*generic_ptr, gen_sig);
3404 }
3405 }
3406 }
3407 return JVMTI_ERROR_NONE;
3408 } /* end GetMethodName */
3409
3410
3411 // method - pre-checked for validity, but may be NULL meaning obsolete method
3412 // declaring_class_ptr - pre-checked for NULL
3413 jvmtiError
3414 JvmtiEnv::GetMethodDeclaringClass(Method* method, jclass* declaring_class_ptr) {
3415 NULL_CHECK(method, JVMTI_ERROR_INVALID_METHODID);
3416 (*declaring_class_ptr) = get_jni_class_non_null(method->method_holder());
3417 return JVMTI_ERROR_NONE;
3418 } /* end GetMethodDeclaringClass */
3419
3420
3421 // method - pre-checked for validity, but may be NULL meaning obsolete method
3422 // modifiers_ptr - pre-checked for NULL
3423 jvmtiError
3424 JvmtiEnv::GetMethodModifiers(Method* method, jint* modifiers_ptr) {
3425 NULL_CHECK(method, JVMTI_ERROR_INVALID_METHODID);
3426 (*modifiers_ptr) = method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
3427 return JVMTI_ERROR_NONE;
3428 } /* end GetMethodModifiers */
3429
3430
3431 // method - pre-checked for validity, but may be NULL meaning obsolete method
3432 // max_ptr - pre-checked for NULL
3433 jvmtiError
3434 JvmtiEnv::GetMaxLocals(Method* method, jint* max_ptr) {
3435 NULL_CHECK(method, JVMTI_ERROR_INVALID_METHODID);
3436 // get max stack
3437 (*max_ptr) = method->max_locals();
3438 return JVMTI_ERROR_NONE;
3439 } /* end GetMaxLocals */
3440
3441
3442 // method - pre-checked for validity, but may be NULL meaning obsolete method
3443 // size_ptr - pre-checked for NULL
3444 jvmtiError
3445 JvmtiEnv::GetArgumentsSize(Method* method, jint* size_ptr) {
3446 NULL_CHECK(method, JVMTI_ERROR_INVALID_METHODID);
3447 // get size of arguments
3448
3449 (*size_ptr) = method->size_of_parameters();
3450 return JVMTI_ERROR_NONE;
3451 } /* end GetArgumentsSize */
3452
3453
3454 // method - pre-checked for validity, but may be NULL meaning obsolete method
3455 // entry_count_ptr - pre-checked for NULL
3456 // table_ptr - pre-checked for NULL
3457 jvmtiError
3458 JvmtiEnv::GetLineNumberTable(Method* method, jint* entry_count_ptr, jvmtiLineNumberEntry** table_ptr) {
3459 NULL_CHECK(method, JVMTI_ERROR_INVALID_METHODID);
3460 if (!method->has_linenumber_table()) {
3461 return (JVMTI_ERROR_ABSENT_INFORMATION);
3462 }
3463
3464 // The line number table is compressed so we don't know how big it is until decompressed.
3465 // Decompression is really fast so we just do it twice.
3466
3467 // Compute size of table
3468 jint num_entries = 0;
3469 CompressedLineNumberReadStream stream(method->compressed_linenumber_table());
3470 while (stream.read_pair()) {
3471 num_entries++;
3472 }
3473 jvmtiLineNumberEntry *jvmti_table =
3474 (jvmtiLineNumberEntry *)jvmtiMalloc(num_entries * (sizeof(jvmtiLineNumberEntry)));
3475
3476 // Fill jvmti table
3477 if (num_entries > 0) {
3478 int index = 0;
3479 CompressedLineNumberReadStream stream(method->compressed_linenumber_table());
3480 while (stream.read_pair()) {
3481 jvmti_table[index].start_location = (jlocation) stream.bci();
3482 jvmti_table[index].line_number = (jint) stream.line();
3483 index++;
3484 }
3485 assert(index == num_entries, "sanity check");
3486 }
3487
3488 // Set up results
3489 (*entry_count_ptr) = num_entries;
3490 (*table_ptr) = jvmti_table;
3491
3492 return JVMTI_ERROR_NONE;
3493 } /* end GetLineNumberTable */
3494
3495
3496 // method - pre-checked for validity, but may be NULL meaning obsolete method
3497 // start_location_ptr - pre-checked for NULL
3498 // end_location_ptr - pre-checked for NULL
3499 jvmtiError
3500 JvmtiEnv::GetMethodLocation(Method* method, jlocation* start_location_ptr, jlocation* end_location_ptr) {
3501
3502 NULL_CHECK(method, JVMTI_ERROR_INVALID_METHODID);
3503 // get start and end location
3504 (*end_location_ptr) = (jlocation) (method->code_size() - 1);
3505 if (method->code_size() == 0) {
3506 // there is no code so there is no start location
3507 (*start_location_ptr) = (jlocation)(-1);
3508 } else {
3509 (*start_location_ptr) = (jlocation)(0);
3510 }
3511
3512 return JVMTI_ERROR_NONE;
3513 } /* end GetMethodLocation */
3514
3515
3516 // method - pre-checked for validity, but may be NULL meaning obsolete method
3517 // entry_count_ptr - pre-checked for NULL
3518 // table_ptr - pre-checked for NULL
3519 jvmtiError
3520 JvmtiEnv::GetLocalVariableTable(Method* method, jint* entry_count_ptr, jvmtiLocalVariableEntry** table_ptr) {
3521
3522 NULL_CHECK(method, JVMTI_ERROR_INVALID_METHODID);
3523 JavaThread* current_thread = JavaThread::current();
3524
3525 // does the klass have any local variable information?
3526 InstanceKlass* ik = method->method_holder();
3527 if (!ik->has_localvariable_table()) {
3528 return (JVMTI_ERROR_ABSENT_INFORMATION);
3529 }
3530
3531 ConstantPool* constants = method->constants();
3532 NULL_CHECK(constants, JVMTI_ERROR_ABSENT_INFORMATION);
3533
3534 // in the vm localvariable table representation, 6 consecutive elements in the table
3535 // represent a 6-tuple of shorts
3536 // [start_pc, length, name_index, descriptor_index, signature_index, index]
3537 jint num_entries = method->localvariable_table_length();
3538 jvmtiLocalVariableEntry *jvmti_table = (jvmtiLocalVariableEntry *)
3539 jvmtiMalloc(num_entries * (sizeof(jvmtiLocalVariableEntry)));
3540
3541 if (num_entries > 0) {
3542 LocalVariableTableElement* table = method->localvariable_table_start();
3543 for (int i = 0; i < num_entries; i++) {
3544 // get the 5 tuple information from the vm table
3545 jlocation start_location = (jlocation) table[i].start_bci;
3546 jint length = (jint) table[i].length;
3547 int name_index = (int) table[i].name_cp_index;
3548 int signature_index = (int) table[i].descriptor_cp_index;
3549 int generic_signature_index = (int) table[i].signature_cp_index;
3550 jint slot = (jint) table[i].slot;
3551
3552 // get utf8 name and signature
3553 char *name_buf = NULL;
3554 char *sig_buf = NULL;
3555 char *gen_sig_buf = NULL;
3556 {
3557 ResourceMark rm(current_thread);
3558
3559 const char *utf8_name = (const char *) constants->symbol_at(name_index)->as_utf8();
3560 name_buf = (char *) jvmtiMalloc(strlen(utf8_name)+1);
3561 strcpy(name_buf, utf8_name);
3562
3563 const char *utf8_signature = (const char *) constants->symbol_at(signature_index)->as_utf8();
3564 sig_buf = (char *) jvmtiMalloc(strlen(utf8_signature)+1);
3565 strcpy(sig_buf, utf8_signature);
3566
3567 if (generic_signature_index > 0) {
3568 const char *utf8_gen_sign = (const char *)
3569 constants->symbol_at(generic_signature_index)->as_utf8();
3570 gen_sig_buf = (char *) jvmtiMalloc(strlen(utf8_gen_sign)+1);
3571 strcpy(gen_sig_buf, utf8_gen_sign);
3572 }
3573 }
3574
3575 // fill in the jvmti local variable table
3576 jvmti_table[i].start_location = start_location;
3577 jvmti_table[i].length = length;
3578 jvmti_table[i].name = name_buf;
3579 jvmti_table[i].signature = sig_buf;
3580 jvmti_table[i].generic_signature = gen_sig_buf;
3581 jvmti_table[i].slot = slot;
3582 }
3583 }
3584
3585 // set results
3586 (*entry_count_ptr) = num_entries;
3587 (*table_ptr) = jvmti_table;
3588
3589 return JVMTI_ERROR_NONE;
3590 } /* end GetLocalVariableTable */
3591
3592
3593 // method - pre-checked for validity, but may be NULL meaning obsolete method
3594 // bytecode_count_ptr - pre-checked for NULL
3595 // bytecodes_ptr - pre-checked for NULL
3596 jvmtiError
3597 JvmtiEnv::GetBytecodes(Method* method, jint* bytecode_count_ptr, unsigned char** bytecodes_ptr) {
3598 NULL_CHECK(method, JVMTI_ERROR_INVALID_METHODID);
3599
3600 methodHandle mh(Thread::current(), method);
3601 jint size = (jint)mh->code_size();
3602 jvmtiError err = allocate(size, bytecodes_ptr);
3603 if (err != JVMTI_ERROR_NONE) {
3604 return err;
3605 }
3606
3607 (*bytecode_count_ptr) = size;
3608 // get byte codes
3609 JvmtiClassFileReconstituter::copy_bytecodes(mh, *bytecodes_ptr);
3610
3611 return JVMTI_ERROR_NONE;
3612 } /* end GetBytecodes */
3613
3614
3615 // method - pre-checked for validity, but may be NULL meaning obsolete method
3616 // is_native_ptr - pre-checked for NULL
3617 jvmtiError
3618 JvmtiEnv::IsMethodNative(Method* method, jboolean* is_native_ptr) {
3619 NULL_CHECK(method, JVMTI_ERROR_INVALID_METHODID);
3620 (*is_native_ptr) = method->is_native();
3621 return JVMTI_ERROR_NONE;
3622 } /* end IsMethodNative */
3623
3624
3625 // method - pre-checked for validity, but may be NULL meaning obsolete method
3626 // is_synthetic_ptr - pre-checked for NULL
3627 jvmtiError
3628 JvmtiEnv::IsMethodSynthetic(Method* method, jboolean* is_synthetic_ptr) {
3629 NULL_CHECK(method, JVMTI_ERROR_INVALID_METHODID);
3630 (*is_synthetic_ptr) = method->is_synthetic();
3631 return JVMTI_ERROR_NONE;
3632 } /* end IsMethodSynthetic */
3633
3634
3635 // method - pre-checked for validity, but may be NULL meaning obsolete method
3636 // is_obsolete_ptr - pre-checked for NULL
3637 jvmtiError
3638 JvmtiEnv::IsMethodObsolete(Method* method, jboolean* is_obsolete_ptr) {
3639 if (use_version_1_0_semantics() &&
3640 get_capabilities()->can_redefine_classes == 0) {
3641 // This JvmtiEnv requested version 1.0 semantics and this function
3642 // requires the can_redefine_classes capability in version 1.0 so
3643 // we need to return an error here.
3644 return JVMTI_ERROR_MUST_POSSESS_CAPABILITY;
3645 }
3646
3647 if (method == NULL || method->is_obsolete()) {
3648 *is_obsolete_ptr = true;
3649 } else {
3650 *is_obsolete_ptr = false;
3651 }
3652 return JVMTI_ERROR_NONE;
3653 } /* end IsMethodObsolete */
3654
3655 //
3656 // Raw Monitor functions
3657 //
3658
3659 // name - pre-checked for NULL
3660 // monitor_ptr - pre-checked for NULL
3661 jvmtiError
3662 JvmtiEnv::CreateRawMonitor(const char* name, jrawMonitorID* monitor_ptr) {
3663 JvmtiRawMonitor* rmonitor = new JvmtiRawMonitor(name);
3664 NULL_CHECK(rmonitor, JVMTI_ERROR_OUT_OF_MEMORY);
3665
3666 *monitor_ptr = (jrawMonitorID)rmonitor;
3667
3668 return JVMTI_ERROR_NONE;
3669 } /* end CreateRawMonitor */
3670
3671
3672 // rmonitor - pre-checked for validity
3673 jvmtiError
3674 JvmtiEnv::DestroyRawMonitor(JvmtiRawMonitor * rmonitor) {
3675 if (Threads::number_of_threads() == 0) {
3676 // Remove this monitor from pending raw monitors list
3677 // if it has entered in onload or start phase.
3678 JvmtiPendingMonitors::destroy(rmonitor);
3679 } else {
3680 Thread* thread = Thread::current();
3681 if (rmonitor->owner() == thread) {
3682 // The caller owns this monitor which we are about to destroy.
3683 // We exit the underlying synchronization object so that the
3684 // "delete monitor" call below can work without an assertion
3685 // failure on systems that don't like destroying synchronization
3686 // objects that are locked.
3687 int r;
3688 int recursion = rmonitor->recursions();
3689 for (int i = 0; i <= recursion; i++) {
3690 r = rmonitor->raw_exit(thread);
3691 assert(r == JvmtiRawMonitor::M_OK, "raw_exit should have worked");
3692 if (r != JvmtiRawMonitor::M_OK) { // robustness
3693 return JVMTI_ERROR_INTERNAL;
3694 }
3695 }
3696 }
3697 if (rmonitor->owner() != NULL) {
3698 // The caller is trying to destroy a monitor that is locked by
3699 // someone else. While this is not forbidden by the JVMTI
3700 // spec, it will cause an assertion failure on systems that don't
3701 // like destroying synchronization objects that are locked.
3702 // We indicate a problem with the error return (and leak the
3703 // monitor's memory).
3704 return JVMTI_ERROR_NOT_MONITOR_OWNER;
3705 }
3706 }
3707
3708 delete rmonitor;
3709
3710 return JVMTI_ERROR_NONE;
3711 } /* end DestroyRawMonitor */
3712
3713
3714 // rmonitor - pre-checked for validity
3715 jvmtiError
3716 JvmtiEnv::RawMonitorEnter(JvmtiRawMonitor * rmonitor) {
3717 if (Threads::number_of_threads() == 0) {
3718 // No JavaThreads exist so JvmtiRawMonitor enter cannot be
3719 // used, add this raw monitor to the pending list.
3720 // The pending monitors will be actually entered when
3721 // the VM is setup.
3722 // See transition_pending_raw_monitors in create_vm()
3723 // in thread.cpp.
3724 JvmtiPendingMonitors::enter(rmonitor);
3725 } else {
3726 Thread* thread = Thread::current();
3727 // 8266889: raw_enter changes Java thread state, needs WXWrite
3728 MACOS_AARCH64_ONLY(ThreadWXEnable __wx(WXWrite, thread));
3729 rmonitor->raw_enter(thread);
3730 }
3731 return JVMTI_ERROR_NONE;
3732 } /* end RawMonitorEnter */
3733
3734
3735 // rmonitor - pre-checked for validity
3736 jvmtiError
3737 JvmtiEnv::RawMonitorExit(JvmtiRawMonitor * rmonitor) {
3738 jvmtiError err = JVMTI_ERROR_NONE;
3739
3740 if (Threads::number_of_threads() == 0) {
3741 // No JavaThreads exist so just remove this monitor from the pending list.
3742 // Bool value from exit is false if rmonitor is not in the list.
3743 if (!JvmtiPendingMonitors::exit(rmonitor)) {
3744 err = JVMTI_ERROR_NOT_MONITOR_OWNER;
3745 }
3746 } else {
3747 Thread* thread = Thread::current();
3748 int r = rmonitor->raw_exit(thread);
3749 if (r == JvmtiRawMonitor::M_ILLEGAL_MONITOR_STATE) {
3750 err = JVMTI_ERROR_NOT_MONITOR_OWNER;
3751 }
3752 }
3753 return err;
3754 } /* end RawMonitorExit */
3755
3756
3757 // rmonitor - pre-checked for validity
3758 jvmtiError
3759 JvmtiEnv::RawMonitorWait(JvmtiRawMonitor * rmonitor, jlong millis) {
3760 Thread* thread = Thread::current();
3761 // 8266889: raw_wait changes Java thread state, needs WXWrite
3762 MACOS_AARCH64_ONLY(ThreadWXEnable __wx(WXWrite, thread));
3763 int r = rmonitor->raw_wait(millis, thread);
3764
3765 switch (r) {
3766 case JvmtiRawMonitor::M_INTERRUPTED:
3767 return JVMTI_ERROR_INTERRUPT;
3768 case JvmtiRawMonitor::M_ILLEGAL_MONITOR_STATE:
3769 return JVMTI_ERROR_NOT_MONITOR_OWNER;
3770 default:
3771 return JVMTI_ERROR_NONE;
3772 }
3773 } /* end RawMonitorWait */
3774
3775
3776 // rmonitor - pre-checked for validity
3777 jvmtiError
3778 JvmtiEnv::RawMonitorNotify(JvmtiRawMonitor * rmonitor) {
3779 Thread* thread = Thread::current();
3780 int r = rmonitor->raw_notify(thread);
3781
3782 if (r == JvmtiRawMonitor::M_ILLEGAL_MONITOR_STATE) {
3783 return JVMTI_ERROR_NOT_MONITOR_OWNER;
3784 }
3785 return JVMTI_ERROR_NONE;
3786 } /* end RawMonitorNotify */
3787
3788
3789 // rmonitor - pre-checked for validity
3790 jvmtiError
3791 JvmtiEnv::RawMonitorNotifyAll(JvmtiRawMonitor * rmonitor) {
3792 Thread* thread = Thread::current();
3793 int r = rmonitor->raw_notifyAll(thread);
3794
3795 if (r == JvmtiRawMonitor::M_ILLEGAL_MONITOR_STATE) {
3796 return JVMTI_ERROR_NOT_MONITOR_OWNER;
3797 }
3798 return JVMTI_ERROR_NONE;
3799 } /* end RawMonitorNotifyAll */
3800
3801
3802 //
3803 // JNI Function Interception functions
3804 //
3805
3806
3807 // function_table - pre-checked for NULL
3808 jvmtiError
3809 JvmtiEnv::SetJNIFunctionTable(const jniNativeInterface* function_table) {
3810 // Copy jni function table at safepoint.
3811 VM_JNIFunctionTableCopier copier(function_table);
3812 VMThread::execute(&copier);
3813
3814 return JVMTI_ERROR_NONE;
3815 } /* end SetJNIFunctionTable */
3816
3817
3818 // function_table - pre-checked for NULL
3819 jvmtiError
3820 JvmtiEnv::GetJNIFunctionTable(jniNativeInterface** function_table) {
3821 *function_table=(jniNativeInterface*)jvmtiMalloc(sizeof(jniNativeInterface));
3822 if (*function_table == NULL)
3823 return JVMTI_ERROR_OUT_OF_MEMORY;
3824 memcpy(*function_table,(JavaThread::current())->get_jni_functions(),sizeof(jniNativeInterface));
3825 return JVMTI_ERROR_NONE;
3826 } /* end GetJNIFunctionTable */
3827
3828
3829 //
3830 // Event Management functions
3831 //
3832
3833 jvmtiError
3834 JvmtiEnv::GenerateEvents(jvmtiEvent event_type) {
3835 // can only generate two event types
3836 if (event_type != JVMTI_EVENT_COMPILED_METHOD_LOAD &&
3837 event_type != JVMTI_EVENT_DYNAMIC_CODE_GENERATED) {
3838 return JVMTI_ERROR_ILLEGAL_ARGUMENT;
3839 }
3840
3841 // for compiled_method_load events we must check that the environment
3842 // has the can_generate_compiled_method_load_events capability.
3843 if (event_type == JVMTI_EVENT_COMPILED_METHOD_LOAD) {
3844 if (get_capabilities()->can_generate_compiled_method_load_events == 0) {
3845 return JVMTI_ERROR_MUST_POSSESS_CAPABILITY;
3846 }
3847 return JvmtiCodeBlobEvents::generate_compiled_method_load_events(this);
3848 } else {
3849 return JvmtiCodeBlobEvents::generate_dynamic_code_events(this);
3850 }
3851
3852 } /* end GenerateEvents */
3853
3854
3855 //
3856 // Extension Mechanism functions
3857 //
3858
3859 // extension_count_ptr - pre-checked for NULL
3860 // extensions - pre-checked for NULL
3861 jvmtiError
3862 JvmtiEnv::GetExtensionFunctions(jint* extension_count_ptr, jvmtiExtensionFunctionInfo** extensions) {
3863 return JvmtiExtensions::get_functions(this, extension_count_ptr, extensions);
3864 } /* end GetExtensionFunctions */
3865
3866
3867 // extension_count_ptr - pre-checked for NULL
3868 // extensions - pre-checked for NULL
3869 jvmtiError
3870 JvmtiEnv::GetExtensionEvents(jint* extension_count_ptr, jvmtiExtensionEventInfo** extensions) {
3871 return JvmtiExtensions::get_events(this, extension_count_ptr, extensions);
3872 } /* end GetExtensionEvents */
3873
3874
3875 // callback - NULL is a valid value, must be checked
3876 jvmtiError
3877 JvmtiEnv::SetExtensionEventCallback(jint extension_event_index, jvmtiExtensionEvent callback) {
3878 return JvmtiExtensions::set_event_callback(this, extension_event_index, callback);
3879 } /* end SetExtensionEventCallback */
3880
3881 //
3882 // Timers functions
3883 //
3884
3885 // info_ptr - pre-checked for NULL
3886 jvmtiError
3887 JvmtiEnv::GetCurrentThreadCpuTimerInfo(jvmtiTimerInfo* info_ptr) {
3888 os::current_thread_cpu_time_info(info_ptr);
3889 return JVMTI_ERROR_NONE;
3890 } /* end GetCurrentThreadCpuTimerInfo */
3891
3892
3893 // nanos_ptr - pre-checked for NULL
3894 jvmtiError
3895 JvmtiEnv::GetCurrentThreadCpuTime(jlong* nanos_ptr) {
3896 Thread* thread = Thread::current();
3897
3898 // Surprisingly the GetCurrentThreadCpuTime is used by non-JavaThread's.
3899 if (thread->is_Java_thread()) {
3900 if (JavaThread::cast(thread)->is_vthread_mounted()) {
3901 // No support for virtual threads (yet).
3902 return JVMTI_ERROR_UNSUPPORTED_OPERATION;
3903 }
3904 }
3905 *nanos_ptr = os::current_thread_cpu_time();
3906 return JVMTI_ERROR_NONE;
3907 } /* end GetCurrentThreadCpuTime */
3908
3909
3910 // info_ptr - pre-checked for NULL
3911 jvmtiError
3912 JvmtiEnv::GetThreadCpuTimerInfo(jvmtiTimerInfo* info_ptr) {
3913 os::thread_cpu_time_info(info_ptr);
3914 return JVMTI_ERROR_NONE;
3915 } /* end GetThreadCpuTimerInfo */
3916
3917
3918 // nanos_ptr - pre-checked for NULL
3919 jvmtiError
3920 JvmtiEnv::GetThreadCpuTime(jthread thread, jlong* nanos_ptr) {
3921 JavaThread* current_thread = JavaThread::current();
3922 ThreadsListHandle tlh(current_thread);
3923 JavaThread* java_thread = NULL;
3924 oop thread_oop = NULL;
3925
3926 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, &java_thread, &thread_oop);
3927
3928 if (thread_oop != NULL && java_lang_VirtualThread::is_instance(thread_oop)) {
3929 // No support for virtual threads (yet).
3930 return JVMTI_ERROR_UNSUPPORTED_OPERATION;
3931 }
3932 if (err != JVMTI_ERROR_NONE) {
3933 return err;
3934 }
3935 NULL_CHECK(nanos_ptr, JVMTI_ERROR_NULL_POINTER);
3936
3937 *nanos_ptr = os::thread_cpu_time(java_thread);
3938 return JVMTI_ERROR_NONE;
3939 } /* end GetThreadCpuTime */
3940
3941
3942 // info_ptr - pre-checked for NULL
3943 jvmtiError
3944 JvmtiEnv::GetTimerInfo(jvmtiTimerInfo* info_ptr) {
3945 os::javaTimeNanos_info(info_ptr);
3946 return JVMTI_ERROR_NONE;
3947 } /* end GetTimerInfo */
3948
3949
3950 // nanos_ptr - pre-checked for NULL
3951 jvmtiError
3952 JvmtiEnv::GetTime(jlong* nanos_ptr) {
3953 *nanos_ptr = os::javaTimeNanos();
3954 return JVMTI_ERROR_NONE;
3955 } /* end GetTime */
3956
3957
3958 // processor_count_ptr - pre-checked for NULL
3959 jvmtiError
3960 JvmtiEnv::GetAvailableProcessors(jint* processor_count_ptr) {
3961 *processor_count_ptr = os::active_processor_count();
3962 return JVMTI_ERROR_NONE;
3963 } /* end GetAvailableProcessors */
3964
3965 jvmtiError
3966 JvmtiEnv::SetHeapSamplingInterval(jint sampling_interval) {
3967 if (sampling_interval < 0) {
3968 return JVMTI_ERROR_ILLEGAL_ARGUMENT;
3969 }
3970 ThreadHeapSampler::set_sampling_interval(sampling_interval);
3971 return JVMTI_ERROR_NONE;
3972 } /* end SetHeapSamplingInterval */
3973
3974 //
3975 // System Properties functions
3976 //
3977
3978 // count_ptr - pre-checked for NULL
3979 // property_ptr - pre-checked for NULL
3980 jvmtiError
3981 JvmtiEnv::GetSystemProperties(jint* count_ptr, char*** property_ptr) {
3982 jvmtiError err = JVMTI_ERROR_NONE;
3983
3984 // Get the number of readable properties.
3985 *count_ptr = Arguments::PropertyList_readable_count(Arguments::system_properties());
3986
3987 // Allocate memory to hold the exact number of readable properties.
3988 err = allocate(*count_ptr * sizeof(char *), (unsigned char **)property_ptr);
3989 if (err != JVMTI_ERROR_NONE) {
3990 return err;
3991 }
3992 int readable_count = 0;
3993 // Loop through the system properties until all the readable properties are found.
3994 for (SystemProperty* p = Arguments::system_properties(); p != NULL && readable_count < *count_ptr; p = p->next()) {
3995 if (p->readable()) {
3996 const char *key = p->key();
3997 char **tmp_value = *property_ptr+readable_count;
3998 readable_count++;
3999 err = allocate((strlen(key)+1) * sizeof(char), (unsigned char**)tmp_value);
4000 if (err == JVMTI_ERROR_NONE) {
4001 strcpy(*tmp_value, key);
4002 } else {
4003 // clean up previously allocated memory.
4004 for (int j = 0; j < readable_count; j++) {
4005 Deallocate((unsigned char*)*property_ptr+j);
4006 }
4007 Deallocate((unsigned char*)property_ptr);
4008 break;
4009 }
4010 }
4011 }
4012 assert(err != JVMTI_ERROR_NONE || readable_count == *count_ptr, "Bad readable property count");
4013 return err;
4014 } /* end GetSystemProperties */
4015
4016
4017 // property - pre-checked for NULL
4018 // value_ptr - pre-checked for NULL
4019 jvmtiError
4020 JvmtiEnv::GetSystemProperty(const char* property, char** value_ptr) {
4021 jvmtiError err = JVMTI_ERROR_NONE;
4022 const char *value;
4023
4024 // Return JVMTI_ERROR_NOT_AVAILABLE if property is not readable or doesn't exist.
4025 value = Arguments::PropertyList_get_readable_value(Arguments::system_properties(), property);
4026 if (value == NULL) {
4027 err = JVMTI_ERROR_NOT_AVAILABLE;
4028 } else {
4029 err = allocate((strlen(value)+1) * sizeof(char), (unsigned char **)value_ptr);
4030 if (err == JVMTI_ERROR_NONE) {
4031 strcpy(*value_ptr, value);
4032 }
4033 }
4034 return err;
4035 } /* end GetSystemProperty */
4036
4037
4038 // property - pre-checked for NULL
4039 // value - NULL is a valid value, must be checked
4040 jvmtiError
4041 JvmtiEnv::SetSystemProperty(const char* property, const char* value_ptr) {
4042 for (SystemProperty* p = Arguments::system_properties(); p != NULL; p = p->next()) {
4043 if (strcmp(property, p->key()) == 0) {
4044 if (p->writeable()) {
4045 if (p->set_value(value_ptr, AllocFailStrategy::RETURN_NULL)) {
4046 return JVMTI_ERROR_NONE;
4047 } else {
4048 return JVMTI_ERROR_OUT_OF_MEMORY;
4049 }
4050 } else {
4051 // We found a property, but it's not writeable
4052 return JVMTI_ERROR_NOT_AVAILABLE;
4053 }
4054 }
4055 }
4056
4057 // We cannot find a property of the given name
4058 return JVMTI_ERROR_NOT_AVAILABLE;
4059 } /* end SetSystemProperty */