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, (JavaThread*) 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 // lock the loader
719 Handle loader = Handle(THREAD, SystemDictionary::java_system_loader());
720 ObjectLocker ol(loader, THREAD);
721
722 // need the path as java.lang.String
723 Handle path = java_lang_String::create_from_platform_dependent_str(segment, THREAD);
724 if (HAS_PENDING_EXCEPTION) {
725 CLEAR_PENDING_EXCEPTION;
726 return JVMTI_ERROR_INTERNAL;
727 }
728
729 // Invoke the appendToClassPathForInstrumentation method - if the method
730 // is not found it means the loader doesn't support adding to the class path
731 // in the live phase.
732 {
733 JavaValue res(T_VOID);
734 JavaCalls::call_special(&res,
735 loader,
736 loader->klass(),
737 vmSymbols::appendToClassPathForInstrumentation_name(),
738 vmSymbols::appendToClassPathForInstrumentation_signature(),
739 path,
740 THREAD);
741 if (HAS_PENDING_EXCEPTION) {
742 Symbol* ex_name = PENDING_EXCEPTION->klass()->name();
743 CLEAR_PENDING_EXCEPTION;
744
745 if (ex_name == vmSymbols::java_lang_NoSuchMethodError()) {
746 return JVMTI_ERROR_CLASS_LOADER_UNSUPPORTED;
747 } else {
748 return JVMTI_ERROR_INTERNAL;
749 }
750 }
751 }
752
753 return JVMTI_ERROR_NONE;
754 } else {
755 return JVMTI_ERROR_WRONG_PHASE;
756 }
757 } /* end AddToSystemClassLoaderSearch */
758
759 //
760 // General functions
761 //
762
763 // phase_ptr - pre-checked for NULL
764 jvmtiError
765 JvmtiEnv::GetPhase(jvmtiPhase* phase_ptr) {
766 *phase_ptr = phase();
767 return JVMTI_ERROR_NONE;
768 } /* end GetPhase */
769
770
771 jvmtiError
772 JvmtiEnv::DisposeEnvironment() {
773 dispose();
774 return JVMTI_ERROR_NONE;
775 } /* end DisposeEnvironment */
776
777
778 // data - NULL is a valid value, must be checked
779 jvmtiError
780 JvmtiEnv::SetEnvironmentLocalStorage(const void* data) {
781 set_env_local_storage(data);
782 return JVMTI_ERROR_NONE;
783 } /* end SetEnvironmentLocalStorage */
784
785
786 // data_ptr - pre-checked for NULL
787 jvmtiError
788 JvmtiEnv::GetEnvironmentLocalStorage(void** data_ptr) {
789 *data_ptr = (void*)get_env_local_storage();
790 return JVMTI_ERROR_NONE;
791 } /* end GetEnvironmentLocalStorage */
792
793 // version_ptr - pre-checked for NULL
794 jvmtiError
795 JvmtiEnv::GetVersionNumber(jint* version_ptr) {
796 *version_ptr = JVMTI_VERSION;
797 return JVMTI_ERROR_NONE;
798 } /* end GetVersionNumber */
799
800
801 // name_ptr - pre-checked for NULL
802 jvmtiError
803 JvmtiEnv::GetErrorName(jvmtiError error, char** name_ptr) {
804 if (error < JVMTI_ERROR_NONE || error > JVMTI_ERROR_MAX) {
805 return JVMTI_ERROR_ILLEGAL_ARGUMENT;
806 }
807 const char *name = JvmtiUtil::error_name(error);
808 if (name == NULL) {
809 return JVMTI_ERROR_ILLEGAL_ARGUMENT;
810 }
811 size_t len = strlen(name) + 1;
812 jvmtiError err = allocate(len, (unsigned char**)name_ptr);
813 if (err == JVMTI_ERROR_NONE) {
814 memcpy(*name_ptr, name, len);
815 }
816 return err;
817 } /* end GetErrorName */
818
819
820 jvmtiError
821 JvmtiEnv::SetVerboseFlag(jvmtiVerboseFlag flag, jboolean value) {
822 LogLevelType level = value == 0 ? LogLevel::Off : LogLevel::Info;
823 switch (flag) {
824 case JVMTI_VERBOSE_OTHER:
825 // ignore
826 break;
827 case JVMTI_VERBOSE_CLASS:
828 LogConfiguration::configure_stdout(level, false, LOG_TAGS(class, unload));
829 LogConfiguration::configure_stdout(level, false, LOG_TAGS(class, load));
830 break;
831 case JVMTI_VERBOSE_GC:
832 LogConfiguration::configure_stdout(level, true, LOG_TAGS(gc));
833 break;
834 case JVMTI_VERBOSE_JNI:
835 level = value == 0 ? LogLevel::Off : LogLevel::Debug;
836 LogConfiguration::configure_stdout(level, true, LOG_TAGS(jni, resolve));
837 break;
838 default:
839 return JVMTI_ERROR_ILLEGAL_ARGUMENT;
840 };
841 return JVMTI_ERROR_NONE;
842 } /* end SetVerboseFlag */
843
844
845 // format_ptr - pre-checked for NULL
846 jvmtiError
847 JvmtiEnv::GetJLocationFormat(jvmtiJlocationFormat* format_ptr) {
848 *format_ptr = JVMTI_JLOCATION_JVMBCI;
849 return JVMTI_ERROR_NONE;
850 } /* end GetJLocationFormat */
851
852 //
853 // Thread functions
854 //
855
856 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
857 // thread_state_ptr - pre-checked for NULL
858 jvmtiError
859 JvmtiEnv::GetThreadState(jthread thread, jint* thread_state_ptr) {
860 JavaThread* current_thread = JavaThread::current();
861 JvmtiVTMSTransitionDisabler disabler;
862 ThreadsListHandle tlh(current_thread);
863
864 JavaThread* java_thread = NULL;
865 oop thread_oop = NULL;
866 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, &java_thread, &thread_oop);
867 if (err != JVMTI_ERROR_NONE && err != JVMTI_ERROR_THREAD_NOT_ALIVE) {
868 // We got an error code so we don't have a JavaThread*, but only
869 // return an error from here if the error is not because the thread
870 // is a virtual thread.
871 return err;
872 }
873
874 if (java_lang_VirtualThread::is_instance(thread_oop)) {
875 *thread_state_ptr = JvmtiEnvBase::get_vthread_state(thread_oop, java_thread);
876 } else {
877 *thread_state_ptr = JvmtiEnvBase::get_thread_state(thread_oop, java_thread);
878 }
879 return JVMTI_ERROR_NONE;
880 } /* end GetThreadState */
881
882
883 // thread_ptr - pre-checked for NULL
884 jvmtiError
885 JvmtiEnv::GetCurrentThread(jthread* thread_ptr) {
886 JavaThread* cur_thread = JavaThread::current();
887 oop thread_oop = get_vthread_or_thread_oop(cur_thread);
888
889 *thread_ptr = (jthread)JNIHandles::make_local(cur_thread, thread_oop);
890 return JVMTI_ERROR_NONE;
891 } /* end GetCurrentThread */
892
893
894 // threads_count_ptr - pre-checked for NULL
895 // threads_ptr - pre-checked for NULL
896 jvmtiError
897 JvmtiEnv::GetAllThreads(jint* threads_count_ptr, jthread** threads_ptr) {
898 int nthreads = 0;
899 Handle *thread_objs = NULL;
900 Thread* current_thread = Thread::current();
901 ResourceMark rm(current_thread);
902 HandleMark hm(current_thread);
903
904 // enumerate threads (including agent threads)
905 ThreadsListEnumerator tle(current_thread, true);
906 nthreads = tle.num_threads();
907 *threads_count_ptr = nthreads;
908
909 if (nthreads == 0) {
910 *threads_ptr = NULL;
911 return JVMTI_ERROR_NONE;
912 }
913
914 thread_objs = NEW_RESOURCE_ARRAY(Handle, nthreads);
915 NULL_CHECK(thread_objs, JVMTI_ERROR_OUT_OF_MEMORY);
916
917 for (int i = 0; i < nthreads; i++) {
918 thread_objs[i] = Handle(tle.get_threadObj(i));
919 }
920
921 jthread *jthreads = new_jthreadArray(nthreads, thread_objs);
922 NULL_CHECK(jthreads, JVMTI_ERROR_OUT_OF_MEMORY);
923
924 *threads_ptr = jthreads;
925 return JVMTI_ERROR_NONE;
926 } /* end GetAllThreads */
927
928
929 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
930 jvmtiError
931 JvmtiEnv::SuspendThread(jthread thread) {
932 JavaThread* current = JavaThread::current();
933
934 jvmtiError err;
935 JavaThread* java_thread = NULL;
936 oop thread_oop = NULL;
937 {
938 JvmtiVTMSTransitionDisabler disabler(true);
939 ThreadsListHandle tlh(current);
940
941 err = get_threadOop_and_JavaThread(tlh.list(), thread, &java_thread, &thread_oop);
942 if (err != JVMTI_ERROR_NONE) {
943 return err;
944 }
945
946 // Do not use JvmtiVTMSTransitionDisabler in context of self suspend to avoid deadlocks.
947 if (java_thread != current) {
948 err = suspend_thread(thread_oop, java_thread, /* single_suspend */ true, NULL);
949 return err;
950 }
951 }
952 // Do self suspend for current JavaThread.
953 err = suspend_thread(thread_oop, current, /* single_suspend */ true, NULL);
954 return err;
955 } /* end SuspendThread */
956
957
958 // request_count - pre-checked to be greater than or equal to 0
959 // request_list - pre-checked for NULL
960 // results - pre-checked for NULL
961 jvmtiError
962 JvmtiEnv::SuspendThreadList(jint request_count, const jthread* request_list, jvmtiError* results) {
963 JavaThread* current = JavaThread::current();
964 HandleMark hm(current);
965 Handle self_tobj = Handle(current, NULL);
966 int self_idx = -1;
967
968 {
969 JvmtiVTMSTransitionDisabler disabler(true);
970 ThreadsListHandle tlh(current);
971
972 for (int i = 0; i < request_count; i++) {
973 JavaThread *java_thread = NULL;
974 oop thread_oop = NULL;
975 jthread thread = request_list[i];
976 jvmtiError err = JvmtiExport::cv_external_thread_to_JavaThread(tlh.list(), thread, &java_thread, &thread_oop);
977
978 if (thread_oop != NULL &&
979 java_lang_VirtualThread::is_instance(thread_oop) &&
980 !JvmtiEnvBase::is_vthread_alive(thread_oop)) {
981 err = JVMTI_ERROR_THREAD_NOT_ALIVE;
982 }
983 if (err != JVMTI_ERROR_NONE) {
984 if (thread_oop == NULL || err != JVMTI_ERROR_INVALID_THREAD) {
985 results[i] = err;
986 continue;
987 }
988 }
989 if (java_thread == current) {
990 self_idx = i;
991 self_tobj = Handle(current, thread_oop);
992 continue; // self suspend after all other suspends
993 }
994 results[i] = suspend_thread(thread_oop, java_thread, /* single_suspend */ true, NULL);
995 }
996 }
997 // Self suspend after all other suspends if necessary.
998 // Do not use JvmtiVTMSTransitionDisabler in context of self suspend to avoid deadlocks.
999 if (self_tobj() != NULL) {
1000 // there should not be any error for current java_thread
1001 results[self_idx] = suspend_thread(self_tobj(), current, /* single_suspend */ true, NULL);
1002 }
1003 // per-thread suspend results returned via results parameter
1004 return JVMTI_ERROR_NONE;
1005 } /* end SuspendThreadList */
1006
1007
1008 jvmtiError
1009 JvmtiEnv::SuspendAllVirtualThreads(jint except_count, const jthread* except_list) {
1010 if (!JvmtiExport::can_support_virtual_threads()) {
1011 return JVMTI_ERROR_MUST_POSSESS_CAPABILITY;
1012 }
1013 if (!Continuations::enabled()) {
1014 return JVMTI_ERROR_NONE; // Nothing to do when there are no virtual threads;
1015 }
1016 JavaThread* current = JavaThread::current();
1017 HandleMark hm(current);
1018 Handle self_tobj = Handle(current, NULL);
1019
1020 {
1021 ResourceMark rm(current);
1022 JvmtiVTMSTransitionDisabler disabler(true);
1023 ThreadsListHandle tlh(current);
1024 GrowableArray<jthread>* elist = new GrowableArray<jthread>(except_count);
1025
1026 jvmtiError err = JvmtiEnvBase::check_thread_list(except_count, except_list);
1027 if (err != JVMTI_ERROR_NONE) {
1028 return err;
1029 }
1030
1031 // Collect threads from except_list for which resumed status must be restored.
1032 for (int idx = 0; idx < except_count; idx++) {
1033 jthread thread = except_list[idx];
1034 oop thread_oop = JNIHandles::resolve_external_guard(thread);
1035 if (!JvmtiVTSuspender::is_vthread_suspended(thread_oop)) {
1036 // is not suspended, so its resumed status must be restored
1037 elist->append(except_list[idx]);
1038 }
1039 }
1040
1041 for (JavaThreadIteratorWithHandle jtiwh; JavaThread *java_thread = jtiwh.next(); ) {
1042 oop vt_oop = java_thread->jvmti_vthread();
1043 if (!java_thread->is_exiting() &&
1044 !java_thread->is_jvmti_agent_thread() &&
1045 !java_thread->is_hidden_from_external_view() &&
1046 vt_oop != NULL &&
1047 java_lang_VirtualThread::is_instance(vt_oop) &&
1048 JvmtiEnvBase::is_vthread_alive(vt_oop) &&
1049 !JvmtiVTSuspender::is_vthread_suspended(vt_oop) &&
1050 !is_in_thread_list(except_count, except_list, vt_oop)
1051 ) {
1052 if (java_thread == current) {
1053 self_tobj = Handle(current, vt_oop);
1054 continue; // self suspend after all other suspends
1055 }
1056 suspend_thread(vt_oop, java_thread, /* single_suspend */ false, NULL);
1057 }
1058 }
1059 JvmtiVTSuspender::register_all_vthreads_suspend();
1060
1061 // Restore resumed state for threads from except list that were not suspended before.
1062 for (int idx = 0; idx < elist->length(); idx++) {
1063 jthread thread = elist->at(idx);
1064 oop thread_oop = JNIHandles::resolve_external_guard(thread);
1065 if (JvmtiVTSuspender::is_vthread_suspended(thread_oop)) {
1066 JvmtiVTSuspender::register_vthread_resume(thread_oop);
1067 }
1068 }
1069 }
1070 // Self suspend after all other suspends if necessary.
1071 // Do not use JvmtiVTMSTransitionDisabler in context of self suspend to avoid deadlocks.
1072 if (self_tobj() != NULL) {
1073 suspend_thread(self_tobj(), current, /* single_suspend */ false, NULL);
1074 }
1075 return JVMTI_ERROR_NONE;
1076 } /* end SuspendAllVirtualThreads */
1077
1078
1079 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
1080 jvmtiError
1081 JvmtiEnv::ResumeThread(jthread thread) {
1082 JvmtiVTMSTransitionDisabler disabler(true);
1083 ThreadsListHandle tlh;
1084
1085 JavaThread* java_thread = NULL;
1086 oop thread_oop = NULL;
1087 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, &java_thread, &thread_oop);
1088 if (err != JVMTI_ERROR_NONE) {
1089 return err;
1090 }
1091 err = resume_thread(thread_oop, java_thread, /* single_resume */ true);
1092 return err;
1093 } /* end ResumeThread */
1094
1095
1096 // request_count - pre-checked to be greater than or equal to 0
1097 // request_list - pre-checked for NULL
1098 // results - pre-checked for NULL
1099 jvmtiError
1100 JvmtiEnv::ResumeThreadList(jint request_count, const jthread* request_list, jvmtiError* results) {
1101 oop thread_oop = NULL;
1102 JavaThread* java_thread = NULL;
1103 JvmtiVTMSTransitionDisabler disabler(true);
1104 ThreadsListHandle tlh;
1105
1106 for (int i = 0; i < request_count; i++) {
1107 jthread thread = request_list[i];
1108 jvmtiError err = JvmtiExport::cv_external_thread_to_JavaThread(tlh.list(), thread, &java_thread, &thread_oop);
1109
1110 if (thread_oop != NULL &&
1111 java_lang_VirtualThread::is_instance(thread_oop) &&
1112 !JvmtiEnvBase::is_vthread_alive(thread_oop)) {
1113 err = JVMTI_ERROR_THREAD_NOT_ALIVE;
1114 }
1115 if (err != JVMTI_ERROR_NONE) {
1116 if (thread_oop == NULL || err != JVMTI_ERROR_INVALID_THREAD) {
1117 results[i] = err;
1118 continue;
1119 }
1120 }
1121 results[i] = resume_thread(thread_oop, java_thread, /* single_resume */ true);
1122 }
1123 // per-thread resume results returned via results parameter
1124 return JVMTI_ERROR_NONE;
1125 } /* end ResumeThreadList */
1126
1127
1128 jvmtiError
1129 JvmtiEnv::ResumeAllVirtualThreads(jint except_count, const jthread* except_list) {
1130 if (!JvmtiExport::can_support_virtual_threads()) {
1131 return JVMTI_ERROR_MUST_POSSESS_CAPABILITY;
1132 }
1133 if (!Continuations::enabled()) {
1134 return JVMTI_ERROR_NONE; // Nothing to do when there are no virtual threads;
1135 }
1136 jvmtiError err = JvmtiEnvBase::check_thread_list(except_count, except_list);
1137 if (err != JVMTI_ERROR_NONE) {
1138 return err;
1139 }
1140 ResourceMark rm;
1141 JvmtiVTMSTransitionDisabler disabler(true);
1142 GrowableArray<jthread>* elist = new GrowableArray<jthread>(except_count);
1143
1144 // Collect threads from except_list for which suspended status must be restored.
1145 for (int idx = 0; idx < except_count; idx++) {
1146 jthread thread = except_list[idx];
1147 oop thread_oop = JNIHandles::resolve_external_guard(thread);
1148 if (JvmtiVTSuspender::is_vthread_suspended(thread_oop)) {
1149 // is suspended, so its suspended status must be restored
1150 elist->append(except_list[idx]);
1151 }
1152 }
1153
1154 for (JavaThreadIteratorWithHandle jtiwh; JavaThread *java_thread = jtiwh.next(); ) {
1155 oop vt_oop = java_thread->jvmti_vthread();
1156 if (!java_thread->is_exiting() &&
1157 !java_thread->is_jvmti_agent_thread() &&
1158 !java_thread->is_hidden_from_external_view() &&
1159 vt_oop != NULL &&
1160 java_lang_VirtualThread::is_instance(vt_oop) &&
1161 JvmtiEnvBase::is_vthread_alive(vt_oop) &&
1162 JvmtiVTSuspender::is_vthread_suspended(vt_oop) &&
1163 !is_in_thread_list(except_count, except_list, vt_oop)
1164 ) {
1165 resume_thread(vt_oop, java_thread, /* single_resume */ false);
1166 }
1167 }
1168 JvmtiVTSuspender::register_all_vthreads_resume();
1169
1170 // Restore suspended state for threads from except list that were suspended before.
1171 for (int idx = 0; idx < elist->length(); idx++) {
1172 jthread thread = elist->at(idx);
1173 oop thread_oop = JNIHandles::resolve_external_guard(thread);
1174 if (!JvmtiVTSuspender::is_vthread_suspended(thread_oop)) {
1175 JvmtiVTSuspender::register_vthread_suspend(thread_oop);
1176 }
1177 }
1178 return JVMTI_ERROR_NONE;
1179 } /* end ResumeAllVirtualThreads */
1180
1181
1182 jvmtiError
1183 JvmtiEnv::StopThread(jthread thread, jobject exception) {
1184 JavaThread* current_thread = JavaThread::current();
1185
1186 JvmtiVTMSTransitionDisabler disabler;
1187 ThreadsListHandle tlh(current_thread);
1188 JavaThread* java_thread = NULL;
1189 oop thread_oop = NULL;
1190
1191 NULL_CHECK(thread, JVMTI_ERROR_INVALID_THREAD);
1192
1193 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, &java_thread, &thread_oop);
1194
1195 if (thread_oop != NULL && java_lang_VirtualThread::is_instance(thread_oop)) {
1196 // No support for virtual threads (yet).
1197 return JVMTI_ERROR_UNSUPPORTED_OPERATION;
1198 }
1199 if (err != JVMTI_ERROR_NONE) {
1200 return err;
1201 }
1202 oop e = JNIHandles::resolve_external_guard(exception);
1203 NULL_CHECK(e, JVMTI_ERROR_NULL_POINTER);
1204
1205 JavaThread::send_async_exception(java_thread, e);
1206
1207 return JVMTI_ERROR_NONE;
1208
1209 } /* end StopThread */
1210
1211
1212 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
1213 jvmtiError
1214 JvmtiEnv::InterruptThread(jthread thread) {
1215 JavaThread* current_thread = JavaThread::current();
1216 HandleMark hm(current_thread);
1217
1218 JvmtiVTMSTransitionDisabler disabler;
1219 ThreadsListHandle tlh(current_thread);
1220
1221 JavaThread* java_thread = NULL;
1222 oop thread_obj = NULL;
1223 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, &java_thread, &thread_obj);
1224 if (err != JVMTI_ERROR_NONE) {
1225 return err;
1226 }
1227
1228 if (java_lang_VirtualThread::is_instance(thread_obj)) {
1229 // For virtual threads we have to call into Java to interrupt:
1230 Handle obj(current_thread, thread_obj);
1231 JavaValue result(T_VOID);
1232 JavaCalls::call_virtual(&result,
1233 obj,
1234 vmClasses::Thread_klass(),
1235 vmSymbols::interrupt_method_name(),
1236 vmSymbols::void_method_signature(),
1237 current_thread);
1238
1239 return JVMTI_ERROR_NONE;
1240 }
1241
1242 // Really this should be a Java call to Thread.interrupt to ensure the same
1243 // semantics, however historically this has not been done for some reason.
1244 // So we continue with that (which means we don't interact with any Java-level
1245 // Interruptible object) but we must set the Java-level interrupted state.
1246 java_lang_Thread::set_interrupted(thread_obj, true);
1247 java_thread->interrupt();
1248
1249 return JVMTI_ERROR_NONE;
1250 } /* end InterruptThread */
1251
1252
1253 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
1254 // info_ptr - pre-checked for NULL
1255 jvmtiError
1256 JvmtiEnv::GetThreadInfo(jthread thread, jvmtiThreadInfo* info_ptr) {
1257 JavaThread* current_thread = JavaThread::current();
1258 ResourceMark rm(current_thread);
1259 HandleMark hm(current_thread);
1260 JavaThread* java_thread = NULL;
1261 oop thread_oop = NULL;
1262
1263 JvmtiVTMSTransitionDisabler disabler;
1264 ThreadsListHandle tlh(current_thread);
1265
1266 // if thread is NULL the current thread is used
1267 if (thread == NULL) {
1268 java_thread = JavaThread::current();
1269 thread_oop = get_vthread_or_thread_oop(java_thread);
1270 if (thread_oop == NULL || !thread_oop->is_a(vmClasses::Thread_klass())) {
1271 return JVMTI_ERROR_INVALID_THREAD;
1272 }
1273 } else {
1274 jvmtiError err = JvmtiExport::cv_external_thread_to_JavaThread(tlh.list(), thread, &java_thread, &thread_oop);
1275 if (err != JVMTI_ERROR_NONE) {
1276 // We got an error code so we don't have a JavaThread *, but
1277 // only return an error from here if we didn't get a valid
1278 // thread_oop.
1279 // In the virtual thread case the cv_external_thread_to_JavaThread is expected to correctly set
1280 // the thread_oop and return JVMTI_ERROR_INVALID_THREAD which we ignore here.
1281 if (thread_oop == NULL) {
1282 return err;
1283 }
1284 }
1285 }
1286 // We have a valid thread_oop so we can return some thread info.
1287
1288 Handle thread_obj(current_thread, thread_oop);
1289 Handle name;
1290 ThreadPriority priority;
1291 Handle thread_group;
1292 Handle context_class_loader;
1293 bool is_daemon;
1294
1295 name = Handle(current_thread, java_lang_Thread::name(thread_obj()));
1296
1297 if (java_lang_VirtualThread::is_instance(thread_obj())) {
1298 priority = (ThreadPriority)JVMTI_THREAD_NORM_PRIORITY;
1299 is_daemon = true;
1300 if (java_lang_VirtualThread::state(thread_obj()) == java_lang_VirtualThread::TERMINATED) {
1301 thread_group = Handle(current_thread, NULL);
1302 } else {
1303 thread_group = Handle(current_thread, java_lang_Thread_Constants::get_VTHREAD_GROUP());
1304 }
1305 } else {
1306 priority = java_lang_Thread::priority(thread_obj());
1307 is_daemon = java_lang_Thread::is_daemon(thread_obj());
1308 if (java_lang_Thread::get_thread_status(thread_obj()) == JavaThreadStatus::TERMINATED) {
1309 thread_group = Handle(current_thread, NULL);
1310 } else {
1311 thread_group = Handle(current_thread, java_lang_Thread::threadGroup(thread_obj()));
1312 }
1313 }
1314
1315 oop loader = java_lang_Thread::context_class_loader(thread_obj());
1316 if (loader != NULL) {
1317 // Do the same as Thread.getContextClassLoader and set context_class_loader to be
1318 // the system class loader when the field value is the "not supported" placeholder.
1319 if (loader == java_lang_Thread_Constants::get_NOT_SUPPORTED_CLASSLOADER()) {
1320 loader = SystemDictionary::java_system_loader();
1321 }
1322 }
1323 context_class_loader = Handle(current_thread, loader);
1324
1325 { const char *n;
1326
1327 if (name() != NULL) {
1328 n = java_lang_String::as_utf8_string(name());
1329 } else {
1330 int utf8_length = 0;
1331 n = UNICODE::as_utf8((jchar*) NULL, utf8_length);
1332 }
1333
1334 info_ptr->name = (char *) jvmtiMalloc(strlen(n)+1);
1335 if (info_ptr->name == NULL)
1336 return JVMTI_ERROR_OUT_OF_MEMORY;
1337
1338 strcpy(info_ptr->name, n);
1339 }
1340 info_ptr->is_daemon = is_daemon;
1341 info_ptr->priority = priority;
1342
1343 info_ptr->context_class_loader = (context_class_loader.is_null()) ? NULL :
1344 jni_reference(context_class_loader);
1345 info_ptr->thread_group = jni_reference(thread_group);
1346
1347 return JVMTI_ERROR_NONE;
1348 } /* end GetThreadInfo */
1349
1350
1351 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
1352 // owned_monitor_count_ptr - pre-checked for NULL
1353 // owned_monitors_ptr - pre-checked for NULL
1354 jvmtiError
1355 JvmtiEnv::GetOwnedMonitorInfo(jthread thread, jint* owned_monitor_count_ptr, jobject** owned_monitors_ptr) {
1356 JavaThread* calling_thread = JavaThread::current();
1357 HandleMark hm(calling_thread);
1358
1359 // growable array of jvmti monitors info on the C-heap
1360 GrowableArray<jvmtiMonitorStackDepthInfo*> *owned_monitors_list =
1361 new (ResourceObj::C_HEAP, mtServiceability) GrowableArray<jvmtiMonitorStackDepthInfo*>(1, mtServiceability);
1362
1363 JvmtiVTMSTransitionDisabler disabler;
1364 ThreadsListHandle tlh(calling_thread);
1365
1366 JavaThread* java_thread = NULL;
1367 oop thread_oop = NULL;
1368 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, &java_thread, &thread_oop);
1369 if (err != JVMTI_ERROR_NONE) {
1370 delete owned_monitors_list;
1371 return err;
1372 }
1373
1374 if (java_lang_VirtualThread::is_instance(thread_oop)) {
1375 // There is no monitor info to collect if target virtual thread is unmounted.
1376 if (java_thread != NULL) {
1377 VirtualThreadGetOwnedMonitorInfoClosure op(this,
1378 Handle(calling_thread, thread_oop),
1379 owned_monitors_list);
1380 Handshake::execute(&op, java_thread);
1381 err = op.result();
1382 }
1383 } else {
1384 EscapeBarrier eb(true, calling_thread, java_thread);
1385 if (!eb.deoptimize_objects(MaxJavaStackTraceDepth)) {
1386 delete owned_monitors_list;
1387 return JVMTI_ERROR_OUT_OF_MEMORY;
1388 }
1389
1390 if (java_thread == calling_thread) {
1391 // It is only safe to make a direct call on the current thread.
1392 // All other usage needs to use a direct handshake for safety.
1393 err = get_owned_monitors(calling_thread, java_thread, owned_monitors_list);
1394 } else {
1395 // get owned monitors info with handshake
1396 GetOwnedMonitorInfoClosure op(calling_thread, this, owned_monitors_list);
1397 Handshake::execute(&op, java_thread);
1398 err = op.result();
1399 }
1400 }
1401
1402 jint owned_monitor_count = owned_monitors_list->length();
1403 if (err == JVMTI_ERROR_NONE) {
1404 if ((err = allocate(owned_monitor_count * sizeof(jobject *),
1405 (unsigned char**)owned_monitors_ptr)) == JVMTI_ERROR_NONE) {
1406 // copy into the returned array
1407 for (int i = 0; i < owned_monitor_count; i++) {
1408 (*owned_monitors_ptr)[i] =
1409 ((jvmtiMonitorStackDepthInfo*)owned_monitors_list->at(i))->monitor;
1410 }
1411 *owned_monitor_count_ptr = owned_monitor_count;
1412 }
1413 }
1414 // clean up.
1415 for (int i = 0; i < owned_monitor_count; i++) {
1416 deallocate((unsigned char*)owned_monitors_list->at(i));
1417 }
1418 delete owned_monitors_list;
1419
1420 return err;
1421 } /* end GetOwnedMonitorInfo */
1422
1423
1424 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
1425 // monitor_info_count_ptr - pre-checked for NULL
1426 // monitor_info_ptr - pre-checked for NULL
1427 jvmtiError
1428 JvmtiEnv::GetOwnedMonitorStackDepthInfo(jthread thread, jint* monitor_info_count_ptr, jvmtiMonitorStackDepthInfo** monitor_info_ptr) {
1429 JavaThread* calling_thread = JavaThread::current();
1430 HandleMark hm(calling_thread);
1431
1432 // growable array of jvmti monitors info on the C-heap
1433 GrowableArray<jvmtiMonitorStackDepthInfo*> *owned_monitors_list =
1434 new (ResourceObj::C_HEAP, mtServiceability) GrowableArray<jvmtiMonitorStackDepthInfo*>(1, mtServiceability);
1435
1436 JvmtiVTMSTransitionDisabler disabler;
1437 ThreadsListHandle tlh(calling_thread);
1438
1439 JavaThread* java_thread = NULL;
1440 oop thread_oop = NULL;
1441 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, &java_thread, &thread_oop);
1442 if (err != JVMTI_ERROR_NONE) {
1443 delete owned_monitors_list;
1444 return err;
1445 }
1446
1447 if (java_lang_VirtualThread::is_instance(thread_oop)) {
1448 // There is no monitor info to collect if target virtual thread is unmounted.
1449 if (java_thread != NULL) {
1450 VirtualThreadGetOwnedMonitorInfoClosure op(this,
1451 Handle(calling_thread, thread_oop),
1452 owned_monitors_list);
1453 Handshake::execute(&op, java_thread);
1454 err = op.result();
1455 }
1456 } else {
1457 EscapeBarrier eb(true, calling_thread, java_thread);
1458 if (!eb.deoptimize_objects(MaxJavaStackTraceDepth)) {
1459 delete owned_monitors_list;
1460 return JVMTI_ERROR_OUT_OF_MEMORY;
1461 }
1462
1463 if (java_thread == calling_thread) {
1464 // It is only safe to make a direct call on the current thread.
1465 // All other usage needs to use a direct handshake for safety.
1466 err = get_owned_monitors(calling_thread, java_thread, owned_monitors_list);
1467 } else {
1468 // get owned monitors info with handshake
1469 GetOwnedMonitorInfoClosure op(calling_thread, this, owned_monitors_list);
1470 Handshake::execute(&op, java_thread);
1471 err = op.result();
1472 }
1473 }
1474 jint owned_monitor_count = owned_monitors_list->length();
1475 if (err == JVMTI_ERROR_NONE) {
1476 if ((err = allocate(owned_monitor_count * sizeof(jvmtiMonitorStackDepthInfo),
1477 (unsigned char**)monitor_info_ptr)) == JVMTI_ERROR_NONE) {
1478 // copy to output array.
1479 for (int i = 0; i < owned_monitor_count; i++) {
1480 (*monitor_info_ptr)[i].monitor =
1481 ((jvmtiMonitorStackDepthInfo*)owned_monitors_list->at(i))->monitor;
1482 (*monitor_info_ptr)[i].stack_depth =
1483 ((jvmtiMonitorStackDepthInfo*)owned_monitors_list->at(i))->stack_depth;
1484 }
1485 }
1486 *monitor_info_count_ptr = owned_monitor_count;
1487 }
1488
1489 // clean up.
1490 for (int i = 0; i < owned_monitor_count; i++) {
1491 deallocate((unsigned char*)owned_monitors_list->at(i));
1492 }
1493 delete owned_monitors_list;
1494
1495 return err;
1496 } /* end GetOwnedMonitorStackDepthInfo */
1497
1498
1499 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
1500 // monitor_ptr - pre-checked for NULL
1501 jvmtiError
1502 JvmtiEnv::GetCurrentContendedMonitor(jthread thread, jobject* monitor_ptr) {
1503 JavaThread* calling_thread = JavaThread::current();
1504 HandleMark hm(calling_thread);
1505
1506 JvmtiVTMSTransitionDisabler disabler;
1507 ThreadsListHandle tlh(calling_thread);
1508
1509 JavaThread* java_thread = NULL;
1510 oop thread_oop = NULL;
1511 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, &java_thread, &thread_oop);
1512 if (err != JVMTI_ERROR_NONE) {
1513 return err;
1514 }
1515
1516 if (java_lang_VirtualThread::is_instance(thread_oop)) {
1517 // There is no monitor info to collect if target virtual thread is unmounted.
1518 if (java_thread != NULL) {
1519 GetCurrentContendedMonitorClosure op(calling_thread, this, monitor_ptr, /* is_virtual */ true);
1520 Handshake::execute(&op, java_thread);
1521 err = op.result();
1522 } else {
1523 *monitor_ptr = NULL;
1524 if (!JvmtiEnvBase::is_vthread_alive(thread_oop)) {
1525 err = JVMTI_ERROR_THREAD_NOT_ALIVE;
1526 }
1527 }
1528 return err;
1529 }
1530 if (java_thread == calling_thread) {
1531 // It is only safe to make a direct call on the current thread.
1532 // All other usage needs to use a direct handshake for safety.
1533 err = get_current_contended_monitor(calling_thread, java_thread, monitor_ptr, /* is_virtual */ false);
1534 } else {
1535 // get contended monitor information with handshake
1536 GetCurrentContendedMonitorClosure op(calling_thread, this, monitor_ptr, /* is_virtual */ false);
1537 Handshake::execute(&op, java_thread);
1538 err = op.result();
1539 }
1540 return err;
1541 } /* end GetCurrentContendedMonitor */
1542
1543
1544 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
1545 // proc - pre-checked for NULL
1546 // arg - NULL is a valid value, must be checked
1547 jvmtiError
1548 JvmtiEnv::RunAgentThread(jthread thread, jvmtiStartFunction proc, const void* arg, jint priority) {
1549 JavaThread* current_thread = JavaThread::current();
1550
1551 JavaThread* java_thread = NULL;
1552 oop thread_oop = NULL;
1553 ThreadsListHandle tlh(current_thread);
1554 jvmtiError err = JvmtiExport::cv_external_thread_to_JavaThread(tlh.list(), thread, &java_thread, &thread_oop);
1555 if (err != JVMTI_ERROR_NONE) {
1556 // We got an error code so we don't have a JavaThread *, but
1557 // only return an error from here if we didn't get a valid
1558 // thread_oop.
1559 if (thread_oop == NULL) {
1560 return err;
1561 }
1562 // We have a valid thread_oop.
1563 }
1564
1565 if (java_thread != NULL) {
1566 // 'thread' refers to an existing JavaThread.
1567 return JVMTI_ERROR_INVALID_THREAD;
1568 }
1569 if (java_lang_VirtualThread::is_instance(thread_oop)) {
1570 // No support for virtual threads.
1571 return JVMTI_ERROR_UNSUPPORTED_OPERATION;
1572 }
1573
1574 if (priority < JVMTI_THREAD_MIN_PRIORITY || priority > JVMTI_THREAD_MAX_PRIORITY) {
1575 return JVMTI_ERROR_INVALID_PRIORITY;
1576 }
1577
1578 Handle thread_hndl(current_thread, thread_oop);
1579
1580 JvmtiAgentThread* new_thread = new JvmtiAgentThread(this, proc, arg);
1581
1582 // At this point it may be possible that no osthread was created for the
1583 // JavaThread due to lack of resources.
1584 if (new_thread->osthread() == NULL) {
1585 // The new thread is not known to Thread-SMR yet so we can just delete.
1586 delete new_thread;
1587 return JVMTI_ERROR_OUT_OF_MEMORY;
1588 }
1589
1590 JavaThread::start_internal_daemon(current_thread, new_thread, thread_hndl,
1591 (ThreadPriority)priority);
1592
1593 return JVMTI_ERROR_NONE;
1594 } /* end RunAgentThread */
1595
1596 //
1597 // Thread Group functions
1598 //
1599
1600 // group_count_ptr - pre-checked for NULL
1601 // groups_ptr - pre-checked for NULL
1602 jvmtiError
1603 JvmtiEnv::GetTopThreadGroups(jint* group_count_ptr, jthreadGroup** groups_ptr) {
1604 JavaThread* current_thread = JavaThread::current();
1605
1606 // Only one top level thread group now.
1607 *group_count_ptr = 1;
1608
1609 // Allocate memory to store global-refs to the thread groups.
1610 // Assume this area is freed by caller.
1611 *groups_ptr = (jthreadGroup *) jvmtiMalloc((sizeof(jthreadGroup)) * (*group_count_ptr));
1612
1613 NULL_CHECK(*groups_ptr, JVMTI_ERROR_OUT_OF_MEMORY);
1614
1615 // Convert oop to Handle, then convert Handle to global-ref.
1616 {
1617 HandleMark hm(current_thread);
1618 Handle system_thread_group(current_thread, Universe::system_thread_group());
1619 *groups_ptr[0] = jni_reference(system_thread_group);
1620 }
1621
1622 return JVMTI_ERROR_NONE;
1623 } /* end GetTopThreadGroups */
1624
1625
1626 // info_ptr - pre-checked for NULL
1627 jvmtiError
1628 JvmtiEnv::GetThreadGroupInfo(jthreadGroup group, jvmtiThreadGroupInfo* info_ptr) {
1629 Thread* current_thread = Thread::current();
1630 ResourceMark rm(current_thread);
1631 HandleMark hm(current_thread);
1632
1633 Handle group_obj (current_thread, JNIHandles::resolve_external_guard(group));
1634 NULL_CHECK(group_obj(), JVMTI_ERROR_INVALID_THREAD_GROUP);
1635
1636 const char* name;
1637 Handle parent_group;
1638 bool is_daemon;
1639 ThreadPriority max_priority;
1640
1641 name = java_lang_ThreadGroup::name(group_obj());
1642 parent_group = Handle(current_thread, java_lang_ThreadGroup::parent(group_obj()));
1643 is_daemon = java_lang_ThreadGroup::is_daemon(group_obj());
1644 max_priority = java_lang_ThreadGroup::maxPriority(group_obj());
1645
1646 info_ptr->is_daemon = is_daemon;
1647 info_ptr->max_priority = max_priority;
1648 info_ptr->parent = jni_reference(parent_group);
1649
1650 if (name != NULL) {
1651 info_ptr->name = (char*)jvmtiMalloc(strlen(name)+1);
1652 NULL_CHECK(info_ptr->name, JVMTI_ERROR_OUT_OF_MEMORY);
1653 strcpy(info_ptr->name, name);
1654 } else {
1655 info_ptr->name = NULL;
1656 }
1657
1658 return JVMTI_ERROR_NONE;
1659 } /* end GetThreadGroupInfo */
1660
1661 // thread_count_ptr - pre-checked for NULL
1662 // threads_ptr - pre-checked for NULL
1663 // group_count_ptr - pre-checked for NULL
1664 // groups_ptr - pre-checked for NULL
1665 jvmtiError
1666 JvmtiEnv::GetThreadGroupChildren(jthreadGroup group, jint* thread_count_ptr, jthread** threads_ptr, jint* group_count_ptr, jthreadGroup** groups_ptr) {
1667 jvmtiError err;
1668 JavaThread* current_thread = JavaThread::current();
1669 oop group_obj = JNIHandles::resolve_external_guard(group);
1670 NULL_CHECK(group_obj, JVMTI_ERROR_INVALID_THREAD_GROUP);
1671
1672 Handle *thread_objs = NULL;
1673 Handle *group_objs = NULL;
1674 jint nthreads = 0;
1675 jint ngroups = 0;
1676 int hidden_threads = 0;
1677
1678 ResourceMark rm(current_thread);
1679 HandleMark hm(current_thread);
1680
1681 Handle group_hdl(current_thread, group_obj);
1682
1683 err = get_live_threads(current_thread, group_hdl, &nthreads, &thread_objs);
1684 if (err != JVMTI_ERROR_NONE) {
1685 return err;
1686 }
1687 err = get_subgroups(current_thread, group_hdl, &ngroups, &group_objs);
1688 if (err != JVMTI_ERROR_NONE) {
1689 return err;
1690 }
1691
1692 *group_count_ptr = ngroups;
1693 *thread_count_ptr = nthreads;
1694 *threads_ptr = new_jthreadArray(nthreads, thread_objs);
1695 *groups_ptr = new_jthreadGroupArray(ngroups, group_objs);
1696 if (nthreads > 0 && *threads_ptr == NULL) {
1697 return JVMTI_ERROR_OUT_OF_MEMORY;
1698 }
1699 if (ngroups > 0 && *groups_ptr == NULL) {
1700 return JVMTI_ERROR_OUT_OF_MEMORY;
1701 }
1702
1703 return JVMTI_ERROR_NONE;
1704 } /* end GetThreadGroupChildren */
1705
1706
1707 //
1708 // Stack Frame functions
1709 //
1710
1711 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
1712 // max_frame_count - pre-checked to be greater than or equal to 0
1713 // frame_buffer - pre-checked for NULL
1714 // count_ptr - pre-checked for NULL
1715 jvmtiError
1716 JvmtiEnv::GetStackTrace(jthread thread, jint start_depth, jint max_frame_count, jvmtiFrameInfo* frame_buffer, jint* count_ptr) {
1717 JavaThread* current_thread = JavaThread::current();
1718 HandleMark hm(current_thread);
1719
1720 JvmtiVTMSTransitionDisabler disabler;
1721 ThreadsListHandle tlh(current_thread);
1722
1723 JavaThread* java_thread = NULL;
1724 oop thread_obj = NULL;
1725 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, &java_thread, &thread_obj);
1726 if (err != JVMTI_ERROR_NONE) {
1727 return err;
1728 }
1729
1730 if (java_lang_VirtualThread::is_instance(thread_obj)) {
1731 if (java_thread == NULL) { // Target virtual thread is unmounted.
1732 ResourceMark rm(current_thread);
1733
1734 VM_VirtualThreadGetStackTrace op(this, Handle(current_thread, thread_obj),
1735 start_depth, max_frame_count,
1736 frame_buffer, count_ptr);
1737 VMThread::execute(&op);
1738 return op.result();
1739 }
1740 VirtualThreadGetStackTraceClosure op(this, Handle(current_thread, thread_obj),
1741 start_depth, max_frame_count, frame_buffer, count_ptr);
1742 Handshake::execute(&op, java_thread);
1743 return op.result();
1744 }
1745
1746 // It is only safe to perform the direct operation on the current
1747 // thread. All other usage needs to use a direct handshake for safety.
1748 if (java_thread == JavaThread::current()) {
1749 err = get_stack_trace(java_thread, start_depth, max_frame_count, frame_buffer, count_ptr);
1750 } else {
1751 // Get stack trace with handshake.
1752 GetStackTraceClosure op(this, start_depth, max_frame_count, frame_buffer, count_ptr);
1753 Handshake::execute(&op, java_thread);
1754 err = op.result();
1755 }
1756
1757 return err;
1758 } /* end GetStackTrace */
1759
1760
1761 // max_frame_count - pre-checked to be greater than or equal to 0
1762 // stack_info_ptr - pre-checked for NULL
1763 // thread_count_ptr - pre-checked for NULL
1764 jvmtiError
1765 JvmtiEnv::GetAllStackTraces(jint max_frame_count, jvmtiStackInfo** stack_info_ptr, jint* thread_count_ptr) {
1766 jvmtiError err = JVMTI_ERROR_NONE;
1767 JavaThread* calling_thread = JavaThread::current();
1768
1769 // JVMTI get stack traces at safepoint.
1770 VM_GetAllStackTraces op(this, calling_thread, max_frame_count);
1771 VMThread::execute(&op);
1772 *thread_count_ptr = op.final_thread_count();
1773 *stack_info_ptr = op.stack_info();
1774 err = op.result();
1775 return err;
1776 } /* end GetAllStackTraces */
1777
1778
1779 // thread_count - pre-checked to be greater than or equal to 0
1780 // thread_list - pre-checked for NULL
1781 // max_frame_count - pre-checked to be greater than or equal to 0
1782 // stack_info_ptr - pre-checked for NULL
1783 jvmtiError
1784 JvmtiEnv::GetThreadListStackTraces(jint thread_count, const jthread* thread_list, jint max_frame_count, jvmtiStackInfo** stack_info_ptr) {
1785 jvmtiError err = JVMTI_ERROR_NONE;
1786
1787 if (thread_count == 1) {
1788 JvmtiVTMSTransitionDisabler disabler;
1789
1790 // Use direct handshake if we need to get only one stack trace.
1791 JavaThread *current_thread = JavaThread::current();
1792 ThreadsListHandle tlh(current_thread);
1793
1794 jthread thread = thread_list[0];
1795 JavaThread *java_thread;
1796 oop thread_obj = NULL;
1797 err = get_threadOop_and_JavaThread(tlh.list(), thread, &java_thread, &thread_obj);
1798 if (err != JVMTI_ERROR_NONE) {
1799 return err;
1800 }
1801
1802 if (java_lang_VirtualThread::is_instance(thread_obj) && java_thread == NULL) {
1803 // Target virtual thread is unmounted.
1804 ResourceMark rm(current_thread);
1805 MultipleStackTracesCollector collector(this, max_frame_count);
1806 collector.fill_frames(thread, java_thread, thread_obj);
1807 collector.allocate_and_fill_stacks(/* thread_count */ 1);
1808 *stack_info_ptr = collector.stack_info();
1809 return collector.result();
1810 }
1811
1812 GetSingleStackTraceClosure op(this, current_thread, thread, max_frame_count);
1813 Handshake::execute(&op, &tlh, java_thread);
1814 err = op.result();
1815 if (err == JVMTI_ERROR_NONE) {
1816 *stack_info_ptr = op.stack_info();
1817 }
1818 } else {
1819 // JVMTI get stack traces at safepoint.
1820 VM_GetThreadListStackTraces op(this, thread_count, thread_list, max_frame_count);
1821 VMThread::execute(&op);
1822 err = op.result();
1823 if (err == JVMTI_ERROR_NONE) {
1824 *stack_info_ptr = op.stack_info();
1825 }
1826 }
1827 return err;
1828 } /* end GetThreadListStackTraces */
1829
1830
1831 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
1832 // count_ptr - pre-checked for NULL
1833 jvmtiError
1834 JvmtiEnv::GetFrameCount(jthread thread, jint* count_ptr) {
1835 JavaThread* current_thread = JavaThread::current();
1836 HandleMark hm(current_thread);
1837
1838 JvmtiVTMSTransitionDisabler disabler;
1839 ThreadsListHandle tlh(current_thread);
1840
1841 JavaThread* java_thread = NULL;
1842 oop thread_obj = NULL;
1843 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, &java_thread, &thread_obj);
1844 if (err != JVMTI_ERROR_NONE) {
1845 return err;
1846 }
1847
1848 if (java_lang_VirtualThread::is_instance(thread_obj)) {
1849 if (java_thread == NULL) { // Target virtual thread is unmounted.
1850 VM_VirtualThreadGetFrameCount op(this, Handle(current_thread, thread_obj), count_ptr);
1851 VMThread::execute(&op);
1852 return op.result();
1853 }
1854 VirtualThreadGetFrameCountClosure op(this, Handle(current_thread, thread_obj), count_ptr);
1855 Handshake::execute(&op, java_thread);
1856 return op.result();
1857 }
1858
1859 // It is only safe to perform the direct operation on the current
1860 // thread. All other usage needs to use a direct handshake for safety.
1861 if (java_thread == JavaThread::current()) {
1862 err = get_frame_count(java_thread, count_ptr);
1863 } else {
1864 // get java stack frame count with handshake.
1865 GetFrameCountClosure op(this, count_ptr);
1866 Handshake::execute(&op, java_thread);
1867 err = op.result();
1868 }
1869 return err;
1870 } /* end GetFrameCount */
1871
1872
1873 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
1874 jvmtiError
1875 JvmtiEnv::PopFrame(jthread thread) {
1876 JavaThread* current_thread = JavaThread::current();
1877 HandleMark hm(current_thread);
1878
1879 if (thread == NULL) {
1880 return JVMTI_ERROR_INVALID_THREAD;
1881 }
1882 JvmtiVTMSTransitionDisabler disabler;
1883 ThreadsListHandle tlh(current_thread);
1884
1885 JavaThread* java_thread = NULL;
1886 oop thread_obj = NULL;
1887 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, &java_thread, &thread_obj);
1888
1889 if (thread_obj != NULL && java_lang_VirtualThread::is_instance(thread_obj)) {
1890 // No support for virtual threads (yet).
1891 return JVMTI_ERROR_OPAQUE_FRAME;
1892 }
1893 if (err != JVMTI_ERROR_NONE) {
1894 return err;
1895 }
1896
1897 // retrieve or create the state
1898 JvmtiThreadState* state = JvmtiThreadState::state_for(java_thread);
1899 if (state == NULL) {
1900 return JVMTI_ERROR_THREAD_NOT_ALIVE;
1901 }
1902
1903 // Eagerly reallocate scalar replaced objects.
1904 EscapeBarrier eb(true, current_thread, java_thread);
1905 if (!eb.deoptimize_objects(1)) {
1906 // Reallocation of scalar replaced objects failed -> return with error
1907 return JVMTI_ERROR_OUT_OF_MEMORY;
1908 }
1909
1910 MutexLocker mu(JvmtiThreadState_lock);
1911 UpdateForPopTopFrameClosure op(state);
1912 if (java_thread == current_thread) {
1913 op.doit(java_thread, true /* self */);
1914 } else {
1915 Handshake::execute(&op, java_thread);
1916 }
1917 return op.result();
1918 } /* end PopFrame */
1919
1920
1921 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
1922 // depth - pre-checked as non-negative
1923 // method_ptr - pre-checked for NULL
1924 // location_ptr - pre-checked for NULL
1925 jvmtiError
1926 JvmtiEnv::GetFrameLocation(jthread thread, jint depth, jmethodID* method_ptr, jlocation* location_ptr) {
1927 JavaThread* current_thread = JavaThread::current();
1928 HandleMark hm(current_thread);
1929
1930 JvmtiVTMSTransitionDisabler disabler;
1931 ThreadsListHandle tlh(current_thread);
1932
1933 JavaThread* java_thread = NULL;
1934 oop thread_obj = NULL;
1935 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, &java_thread, &thread_obj);
1936 if (err != JVMTI_ERROR_NONE) {
1937 return err;
1938 }
1939
1940 if (java_lang_VirtualThread::is_instance(thread_obj)) {
1941 if (java_thread == NULL) { // Target virtual thread is unmounted.
1942 err = get_frame_location(thread_obj, depth, method_ptr, location_ptr);
1943 return err;
1944 }
1945 VirtualThreadGetFrameLocationClosure op(this, Handle(current_thread, thread_obj),
1946 depth, method_ptr, location_ptr);
1947 Handshake::execute(&op, java_thread);
1948 return op.result();
1949 }
1950
1951 // It is only safe to perform the direct operation on the current
1952 // thread. All other usage needs to use a direct handshake for safety.
1953 if (java_thread == JavaThread::current()) {
1954 err = get_frame_location(java_thread, depth, method_ptr, location_ptr);
1955 } else {
1956 // JVMTI get java stack frame location via direct handshake.
1957 GetFrameLocationClosure op(this, depth, method_ptr, location_ptr);
1958 Handshake::execute(&op, java_thread);
1959 err = op.result();
1960 }
1961 return err;
1962 } /* end GetFrameLocation */
1963
1964
1965 // Threads_lock NOT held, java_thread not protected by lock
1966 // depth - pre-checked as non-negative
1967 jvmtiError
1968 JvmtiEnv::NotifyFramePop(jthread thread, jint depth) {
1969 ResourceMark rm;
1970 JvmtiVTMSTransitionDisabler disabler;
1971 ThreadsListHandle tlh;
1972
1973 JavaThread* java_thread = NULL;
1974 oop thread_obj = NULL;
1975 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, &java_thread, &thread_obj);
1976 if (err != JVMTI_ERROR_NONE) {
1977 return err;
1978 }
1979
1980 JavaThread* current = JavaThread::current();
1981 HandleMark hm(current);
1982 Handle thread_handle(current, thread_obj);
1983 JvmtiThreadState *state = JvmtiThreadState::state_for(java_thread, thread_handle);
1984 if (state == NULL) {
1985 return JVMTI_ERROR_THREAD_NOT_ALIVE;
1986 }
1987
1988 if (java_lang_VirtualThread::is_instance(thread_handle())) {
1989 VirtualThreadSetFramePopClosure op(this, thread_handle, state, depth);
1990 MutexLocker mu(current, JvmtiThreadState_lock);
1991 if (java_thread == NULL || java_thread == current) {
1992 // Target virtual thread is unmounted or current.
1993 op.doit(java_thread, true /* self */);
1994 } else {
1995 Handshake::execute(&op, java_thread);
1996 }
1997 return op.result();
1998 }
1999
2000 SetFramePopClosure op(this, state, depth);
2001 MutexLocker mu(current, JvmtiThreadState_lock);
2002 if (java_thread == current) {
2003 op.doit(java_thread, true /* self */);
2004 } else {
2005 Handshake::execute(&op, java_thread);
2006 }
2007 return op.result();
2008 } /* end NotifyFramePop */
2009
2010
2011 //
2012 // Force Early Return functions
2013 //
2014
2015 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
2016 jvmtiError
2017 JvmtiEnv::ForceEarlyReturnObject(jthread thread, jobject value) {
2018 jvalue val;
2019 val.l = value;
2020 return force_early_return(thread, val, atos);
2021 } /* end ForceEarlyReturnObject */
2022
2023
2024 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
2025 jvmtiError
2026 JvmtiEnv::ForceEarlyReturnInt(jthread thread, jint value) {
2027 jvalue val;
2028 val.i = value;
2029 return force_early_return(thread, val, itos);
2030 } /* end ForceEarlyReturnInt */
2031
2032
2033 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
2034 jvmtiError
2035 JvmtiEnv::ForceEarlyReturnLong(jthread thread, jlong value) {
2036 jvalue val;
2037 val.j = value;
2038 return force_early_return(thread, val, ltos);
2039 } /* end ForceEarlyReturnLong */
2040
2041
2042 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
2043 jvmtiError
2044 JvmtiEnv::ForceEarlyReturnFloat(jthread thread, jfloat value) {
2045 jvalue val;
2046 val.f = value;
2047 return force_early_return(thread, val, ftos);
2048 } /* end ForceEarlyReturnFloat */
2049
2050
2051 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
2052 jvmtiError
2053 JvmtiEnv::ForceEarlyReturnDouble(jthread thread, jdouble value) {
2054 jvalue val;
2055 val.d = value;
2056 return force_early_return(thread, val, dtos);
2057 } /* end ForceEarlyReturnDouble */
2058
2059
2060 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
2061 jvmtiError
2062 JvmtiEnv::ForceEarlyReturnVoid(jthread thread) {
2063 jvalue val;
2064 val.j = 0L;
2065 return force_early_return(thread, val, vtos);
2066 } /* end ForceEarlyReturnVoid */
2067
2068
2069 //
2070 // Heap functions
2071 //
2072
2073 // klass - NULL is a valid value, must be checked
2074 // initial_object - NULL is a valid value, must be checked
2075 // callbacks - pre-checked for NULL
2076 // user_data - NULL is a valid value, must be checked
2077 jvmtiError
2078 JvmtiEnv::FollowReferences(jint heap_filter, jclass klass, jobject initial_object, const jvmtiHeapCallbacks* callbacks, const void* user_data) {
2079 // check klass if provided
2080 Klass* k = NULL;
2081 if (klass != NULL) {
2082 oop k_mirror = JNIHandles::resolve_external_guard(klass);
2083 if (k_mirror == NULL) {
2084 return JVMTI_ERROR_INVALID_CLASS;
2085 }
2086 if (java_lang_Class::is_primitive(k_mirror)) {
2087 return JVMTI_ERROR_NONE;
2088 }
2089 k = java_lang_Class::as_Klass(k_mirror);
2090 if (klass == NULL) {
2091 return JVMTI_ERROR_INVALID_CLASS;
2092 }
2093 }
2094
2095 if (initial_object != NULL) {
2096 oop init_obj = JNIHandles::resolve_external_guard(initial_object);
2097 if (init_obj == NULL) {
2098 return JVMTI_ERROR_INVALID_OBJECT;
2099 }
2100 }
2101
2102 Thread *thread = Thread::current();
2103 HandleMark hm(thread);
2104
2105 TraceTime t("FollowReferences", TRACETIME_LOG(Debug, jvmti, objecttagging));
2106 JvmtiTagMap::tag_map_for(this)->follow_references(heap_filter, k, initial_object, callbacks, user_data);
2107 return JVMTI_ERROR_NONE;
2108 } /* end FollowReferences */
2109
2110
2111 // klass - NULL is a valid value, must be checked
2112 // callbacks - pre-checked for NULL
2113 // user_data - NULL is a valid value, must be checked
2114 jvmtiError
2115 JvmtiEnv::IterateThroughHeap(jint heap_filter, jclass klass, const jvmtiHeapCallbacks* callbacks, const void* user_data) {
2116 // check klass if provided
2117 Klass* k = NULL;
2118 if (klass != NULL) {
2119 oop k_mirror = JNIHandles::resolve_external_guard(klass);
2120 if (k_mirror == NULL) {
2121 return JVMTI_ERROR_INVALID_CLASS;
2122 }
2123 if (java_lang_Class::is_primitive(k_mirror)) {
2124 return JVMTI_ERROR_NONE;
2125 }
2126 k = java_lang_Class::as_Klass(k_mirror);
2127 if (k == NULL) {
2128 return JVMTI_ERROR_INVALID_CLASS;
2129 }
2130 }
2131
2132 TraceTime t("IterateThroughHeap", TRACETIME_LOG(Debug, jvmti, objecttagging));
2133 JvmtiTagMap::tag_map_for(this)->iterate_through_heap(heap_filter, k, callbacks, user_data);
2134 return JVMTI_ERROR_NONE;
2135 } /* end IterateThroughHeap */
2136
2137
2138 // tag_ptr - pre-checked for NULL
2139 jvmtiError
2140 JvmtiEnv::GetTag(jobject object, jlong* tag_ptr) {
2141 oop o = JNIHandles::resolve_external_guard(object);
2142 NULL_CHECK(o, JVMTI_ERROR_INVALID_OBJECT);
2143 *tag_ptr = JvmtiTagMap::tag_map_for(this)->get_tag(object);
2144 return JVMTI_ERROR_NONE;
2145 } /* end GetTag */
2146
2147
2148 jvmtiError
2149 JvmtiEnv::SetTag(jobject object, jlong tag) {
2150 oop o = JNIHandles::resolve_external_guard(object);
2151 NULL_CHECK(o, JVMTI_ERROR_INVALID_OBJECT);
2152 JvmtiTagMap::tag_map_for(this)->set_tag(object, tag);
2153 return JVMTI_ERROR_NONE;
2154 } /* end SetTag */
2155
2156
2157 // tag_count - pre-checked to be greater than or equal to 0
2158 // tags - pre-checked for NULL
2159 // count_ptr - pre-checked for NULL
2160 // object_result_ptr - NULL is a valid value, must be checked
2161 // tag_result_ptr - NULL is a valid value, must be checked
2162 jvmtiError
2163 JvmtiEnv::GetObjectsWithTags(jint tag_count, const jlong* tags, jint* count_ptr, jobject** object_result_ptr, jlong** tag_result_ptr) {
2164 TraceTime t("GetObjectsWithTags", TRACETIME_LOG(Debug, jvmti, objecttagging));
2165 return JvmtiTagMap::tag_map_for(this)->get_objects_with_tags((jlong*)tags, tag_count, count_ptr, object_result_ptr, tag_result_ptr);
2166 } /* end GetObjectsWithTags */
2167
2168
2169 jvmtiError
2170 JvmtiEnv::ForceGarbageCollection() {
2171 Universe::heap()->collect(GCCause::_jvmti_force_gc);
2172 return JVMTI_ERROR_NONE;
2173 } /* end ForceGarbageCollection */
2174
2175
2176 //
2177 // Heap (1.0) functions
2178 //
2179
2180 // object_reference_callback - pre-checked for NULL
2181 // user_data - NULL is a valid value, must be checked
2182 jvmtiError
2183 JvmtiEnv::IterateOverObjectsReachableFromObject(jobject object, jvmtiObjectReferenceCallback object_reference_callback, const void* user_data) {
2184 oop o = JNIHandles::resolve_external_guard(object);
2185 NULL_CHECK(o, JVMTI_ERROR_INVALID_OBJECT);
2186 JvmtiTagMap::tag_map_for(this)->iterate_over_objects_reachable_from_object(object, object_reference_callback, user_data);
2187 return JVMTI_ERROR_NONE;
2188 } /* end IterateOverObjectsReachableFromObject */
2189
2190
2191 // heap_root_callback - NULL is a valid value, must be checked
2192 // stack_ref_callback - NULL is a valid value, must be checked
2193 // object_ref_callback - NULL is a valid value, must be checked
2194 // user_data - NULL is a valid value, must be checked
2195 jvmtiError
2196 JvmtiEnv::IterateOverReachableObjects(jvmtiHeapRootCallback heap_root_callback, jvmtiStackReferenceCallback stack_ref_callback, jvmtiObjectReferenceCallback object_ref_callback, const void* user_data) {
2197 TraceTime t("IterateOverReachableObjects", TRACETIME_LOG(Debug, jvmti, objecttagging));
2198 JvmtiTagMap::tag_map_for(this)->iterate_over_reachable_objects(heap_root_callback, stack_ref_callback, object_ref_callback, user_data);
2199 return JVMTI_ERROR_NONE;
2200 } /* end IterateOverReachableObjects */
2201
2202
2203 // heap_object_callback - pre-checked for NULL
2204 // user_data - NULL is a valid value, must be checked
2205 jvmtiError
2206 JvmtiEnv::IterateOverHeap(jvmtiHeapObjectFilter object_filter, jvmtiHeapObjectCallback heap_object_callback, const void* user_data) {
2207 TraceTime t("IterateOverHeap", TRACETIME_LOG(Debug, jvmti, objecttagging));
2208 Thread *thread = Thread::current();
2209 HandleMark hm(thread);
2210 JvmtiTagMap::tag_map_for(this)->iterate_over_heap(object_filter, NULL, heap_object_callback, user_data);
2211 return JVMTI_ERROR_NONE;
2212 } /* end IterateOverHeap */
2213
2214
2215 // k_mirror - may be primitive, this must be checked
2216 // heap_object_callback - pre-checked for NULL
2217 // user_data - NULL is a valid value, must be checked
2218 jvmtiError
2219 JvmtiEnv::IterateOverInstancesOfClass(oop k_mirror, jvmtiHeapObjectFilter object_filter, jvmtiHeapObjectCallback heap_object_callback, const void* user_data) {
2220 if (java_lang_Class::is_primitive(k_mirror)) {
2221 // DO PRIMITIVE CLASS PROCESSING
2222 return JVMTI_ERROR_NONE;
2223 }
2224 Klass* klass = java_lang_Class::as_Klass(k_mirror);
2225 if (klass == NULL) {
2226 return JVMTI_ERROR_INVALID_CLASS;
2227 }
2228 TraceTime t("IterateOverInstancesOfClass", TRACETIME_LOG(Debug, jvmti, objecttagging));
2229 JvmtiTagMap::tag_map_for(this)->iterate_over_heap(object_filter, klass, heap_object_callback, user_data);
2230 return JVMTI_ERROR_NONE;
2231 } /* end IterateOverInstancesOfClass */
2232
2233
2234 //
2235 // Local Variable functions
2236 //
2237
2238 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
2239 // depth - pre-checked as non-negative
2240 // value_ptr - pre-checked for NULL
2241 jvmtiError
2242 JvmtiEnv::GetLocalObject(jthread thread, jint depth, jint slot, jobject* value_ptr) {
2243 JavaThread* current_thread = JavaThread::current();
2244 // rm object is created to clean up the javaVFrame created in
2245 // doit_prologue(), but after doit() is finished with it.
2246 ResourceMark rm(current_thread);
2247 HandleMark hm(current_thread);
2248 JvmtiVTMSTransitionDisabler disabler;
2249
2250 jvmtiError err = JVMTI_ERROR_NONE;
2251 oop thread_obj = current_thread_obj_or_resolve_external_guard(thread);
2252 if (java_lang_VirtualThread::is_instance(thread_obj)) {
2253 VM_VirtualThreadGetOrSetLocal op(this, Handle(current_thread, thread_obj),
2254 current_thread, depth, slot);
2255 VMThread::execute(&op);
2256 err = op.result();
2257 if (err == JVMTI_ERROR_NONE) {
2258 *value_ptr = op.value().l;
2259 }
2260 } else {
2261 // Support for ordinary threads
2262 ThreadsListHandle tlh(current_thread);
2263 JavaThread* java_thread = NULL;
2264 err = get_JavaThread(tlh.list(), thread, &java_thread);
2265 if (err != JVMTI_ERROR_NONE) {
2266 return err;
2267 }
2268 VM_GetOrSetLocal op(java_thread, current_thread, depth, slot);
2269 VMThread::execute(&op);
2270 err = op.result();
2271 if (err == JVMTI_ERROR_NONE) {
2272 *value_ptr = op.value().l;
2273 }
2274 }
2275 return err;
2276 } /* end GetLocalObject */
2277
2278 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
2279 // depth - pre-checked as non-negative
2280 // value - pre-checked for NULL
2281 jvmtiError
2282 JvmtiEnv::GetLocalInstance(jthread thread, jint depth, jobject* value_ptr){
2283 JavaThread* current_thread = JavaThread::current();
2284 // rm object is created to clean up the javaVFrame created in
2285 // doit_prologue(), but after doit() is finished with it.
2286 ResourceMark rm(current_thread);
2287 HandleMark hm(current_thread);
2288 JvmtiVTMSTransitionDisabler disabler;
2289
2290 jvmtiError err = JVMTI_ERROR_NONE;
2291 oop thread_obj = current_thread_obj_or_resolve_external_guard(thread);
2292 if (java_lang_VirtualThread::is_instance(thread_obj)) {
2293 VM_VirtualThreadGetReceiver op(this, Handle(current_thread, thread_obj),
2294 current_thread, depth);
2295 VMThread::execute(&op);
2296 err = op.result();
2297 if (err == JVMTI_ERROR_NONE) {
2298 *value_ptr = op.value().l;
2299 }
2300 } else {
2301 // Support for ordinary threads
2302 ThreadsListHandle tlh(current_thread);
2303 JavaThread* java_thread = NULL;
2304 err = get_JavaThread(tlh.list(), thread, &java_thread);
2305 if (err != JVMTI_ERROR_NONE) {
2306 return err;
2307 }
2308 VM_GetReceiver op(java_thread, current_thread, depth);
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
2331 jvmtiError err = JVMTI_ERROR_NONE;
2332 oop thread_obj = current_thread_obj_or_resolve_external_guard(thread);
2333 if (java_lang_VirtualThread::is_instance(thread_obj)) {
2334 VM_VirtualThreadGetOrSetLocal op(this, Handle(current_thread, thread_obj),
2335 depth, slot, T_INT);
2336 VMThread::execute(&op);
2337 err = op.result();
2338 if (err == JVMTI_ERROR_NONE) {
2339 *value_ptr = op.value().i;
2340 }
2341 } else {
2342 // Support for ordinary threads
2343 ThreadsListHandle tlh(current_thread);
2344 JavaThread* java_thread = NULL;
2345 err = get_JavaThread(tlh.list(), thread, &java_thread);
2346 if (err != JVMTI_ERROR_NONE) {
2347 return err;
2348 }
2349 VM_GetOrSetLocal op(java_thread, depth, slot, T_INT);
2350 VMThread::execute(&op);
2351 err = op.result();
2352 if (err == JVMTI_ERROR_NONE) {
2353 *value_ptr = op.value().i;
2354 }
2355 }
2356 return err;
2357 } /* end GetLocalInt */
2358
2359
2360 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
2361 // depth - pre-checked as non-negative
2362 // value_ptr - pre-checked for NULL
2363 jvmtiError
2364 JvmtiEnv::GetLocalLong(jthread thread, jint depth, jint slot, jlong* value_ptr) {
2365 JavaThread* current_thread = JavaThread::current();
2366 // rm object is created to clean up the javaVFrame created in
2367 // doit_prologue(), but after doit() is finished with it.
2368 ResourceMark rm(current_thread);
2369 HandleMark hm(current_thread);
2370 JvmtiVTMSTransitionDisabler disabler;
2371
2372 jvmtiError err = JVMTI_ERROR_NONE;
2373 oop thread_obj = current_thread_obj_or_resolve_external_guard(thread);
2374 if (java_lang_VirtualThread::is_instance(thread_obj)) {
2375 VM_VirtualThreadGetOrSetLocal op(this, Handle(current_thread, thread_obj),
2376 depth, slot, T_LONG);
2377 VMThread::execute(&op);
2378 err = op.result();
2379 if (err == JVMTI_ERROR_NONE) {
2380 *value_ptr = op.value().j;
2381 }
2382 } else {
2383 // Support for ordinary threads
2384 ThreadsListHandle tlh(current_thread);
2385 JavaThread* java_thread = NULL;
2386 err = get_JavaThread(tlh.list(), thread, &java_thread);
2387 if (err != JVMTI_ERROR_NONE) {
2388 return err;
2389 }
2390 VM_GetOrSetLocal op(java_thread, depth, slot, T_LONG);
2391 VMThread::execute(&op);
2392 err = op.result();
2393 if (err == JVMTI_ERROR_NONE) {
2394 *value_ptr = op.value().j;
2395 }
2396 }
2397 return err;
2398 } /* end GetLocalLong */
2399
2400
2401 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
2402 // depth - pre-checked as non-negative
2403 // value_ptr - pre-checked for NULL
2404 jvmtiError
2405 JvmtiEnv::GetLocalFloat(jthread thread, jint depth, jint slot, jfloat* value_ptr) {
2406 JavaThread* current_thread = JavaThread::current();
2407 // rm object is created to clean up the javaVFrame created in
2408 // doit_prologue(), but after doit() is finished with it.
2409 ResourceMark rm(current_thread);
2410 HandleMark hm(current_thread);
2411 JvmtiVTMSTransitionDisabler disabler;
2412
2413 jvmtiError err = JVMTI_ERROR_NONE;
2414 oop thread_obj = current_thread_obj_or_resolve_external_guard(thread);
2415 if (java_lang_VirtualThread::is_instance(thread_obj)) {
2416 VM_VirtualThreadGetOrSetLocal op(this, Handle(current_thread, thread_obj),
2417 depth, slot, T_FLOAT);
2418 VMThread::execute(&op);
2419 err = op.result();
2420 if (err == JVMTI_ERROR_NONE) {
2421 *value_ptr = op.value().f;
2422 }
2423 } else {
2424 // Support for ordinary threads
2425 ThreadsListHandle tlh(current_thread);
2426 JavaThread* java_thread = NULL;
2427 err = get_JavaThread(tlh.list(), thread, &java_thread);
2428 if (err != JVMTI_ERROR_NONE) {
2429 return err;
2430 }
2431 VM_GetOrSetLocal op(java_thread, depth, slot, T_FLOAT);
2432 VMThread::execute(&op);
2433 err = op.result();
2434 if (err == JVMTI_ERROR_NONE) {
2435 *value_ptr = op.value().f;
2436 }
2437 }
2438 return err;
2439 } /* end GetLocalFloat */
2440
2441
2442 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
2443 // depth - pre-checked as non-negative
2444 // value_ptr - pre-checked for NULL
2445 jvmtiError
2446 JvmtiEnv::GetLocalDouble(jthread thread, jint depth, jint slot, jdouble* value_ptr) {
2447 JavaThread* current_thread = JavaThread::current();
2448 // rm object is created to clean up the javaVFrame created in
2449 // doit_prologue(), but after doit() is finished with it.
2450 ResourceMark rm(current_thread);
2451 HandleMark hm(current_thread);
2452 JvmtiVTMSTransitionDisabler disabler;
2453
2454 jvmtiError err = JVMTI_ERROR_NONE;
2455 oop thread_obj = current_thread_obj_or_resolve_external_guard(thread);
2456 if (java_lang_VirtualThread::is_instance(thread_obj)) {
2457 VM_VirtualThreadGetOrSetLocal op(this, Handle(current_thread, thread_obj),
2458 depth, slot, T_DOUBLE);
2459 VMThread::execute(&op);
2460 err = op.result();
2461 if (err == JVMTI_ERROR_NONE) {
2462 *value_ptr = op.value().d;
2463 }
2464 } else {
2465 // Support for ordinary threads
2466 ThreadsListHandle tlh(current_thread);
2467 JavaThread* java_thread = NULL;
2468 err = get_JavaThread(tlh.list(), thread, &java_thread);
2469 if (err != JVMTI_ERROR_NONE) {
2470 return err;
2471 }
2472 VM_GetOrSetLocal op(java_thread, depth, slot, T_DOUBLE);
2473 VMThread::execute(&op);
2474 err = op.result();
2475 if (err == JVMTI_ERROR_NONE) {
2476 *value_ptr = op.value().d;
2477 }
2478 }
2479 return err;
2480 } /* end GetLocalDouble */
2481
2482
2483 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
2484 // depth - pre-checked as non-negative
2485 jvmtiError
2486 JvmtiEnv::SetLocalObject(jthread thread, jint depth, jint slot, jobject value) {
2487 JavaThread* current_thread = JavaThread::current();
2488 // rm object is created to clean up the javaVFrame created in
2489 // doit_prologue(), but after doit() is finished with it.
2490 ResourceMark rm(current_thread);
2491 HandleMark hm(current_thread);
2492 JvmtiVTMSTransitionDisabler disabler;
2493 jvalue val;
2494 val.l = value;
2495
2496 jvmtiError err = JVMTI_ERROR_NONE;
2497 oop thread_obj = current_thread_obj_or_resolve_external_guard(thread);
2498 if (java_lang_VirtualThread::is_instance(thread_obj)) {
2499 VM_VirtualThreadGetOrSetLocal op(this, Handle(current_thread, thread_obj),
2500 depth, slot, T_OBJECT, val);
2501 VMThread::execute(&op);
2502 err = op.result();
2503 } else {
2504 // Support for ordinary threads
2505 ThreadsListHandle tlh(current_thread);
2506 JavaThread* java_thread = NULL;
2507 err = get_JavaThread(tlh.list(), thread, &java_thread);
2508 if (err != JVMTI_ERROR_NONE) {
2509 return err;
2510 }
2511 VM_GetOrSetLocal op(java_thread, depth, slot, T_OBJECT, val);
2512 VMThread::execute(&op);
2513 err = op.result();
2514 }
2515 return err;
2516 } /* end SetLocalObject */
2517
2518
2519 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
2520 // depth - pre-checked as non-negative
2521 jvmtiError
2522 JvmtiEnv::SetLocalInt(jthread thread, jint depth, jint slot, jint value) {
2523 JavaThread* current_thread = JavaThread::current();
2524 // rm object is created to clean up the javaVFrame created in
2525 // doit_prologue(), but after doit() is finished with it.
2526 ResourceMark rm(current_thread);
2527 HandleMark hm(current_thread);
2528 JvmtiVTMSTransitionDisabler disabler;
2529 jvalue val;
2530 val.i = value;
2531
2532 jvmtiError err = JVMTI_ERROR_NONE;
2533 oop thread_obj = current_thread_obj_or_resolve_external_guard(thread);
2534 if (java_lang_VirtualThread::is_instance(thread_obj)) {
2535 VM_VirtualThreadGetOrSetLocal op(this, Handle(current_thread, thread_obj),
2536 depth, slot, T_INT, val);
2537 VMThread::execute(&op);
2538 err = op.result();
2539 } else {
2540 // Support for ordinary threads
2541 ThreadsListHandle tlh(current_thread);
2542 JavaThread* java_thread = NULL;
2543 err = get_JavaThread(tlh.list(), thread, &java_thread);
2544 if (err != JVMTI_ERROR_NONE) {
2545 return err;
2546 }
2547 VM_GetOrSetLocal op(java_thread, depth, slot, T_INT, val);
2548 VMThread::execute(&op);
2549 err = op.result();
2550 }
2551 return err;
2552 } /* end SetLocalInt */
2553
2554
2555 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
2556 // depth - pre-checked as non-negative
2557 jvmtiError
2558 JvmtiEnv::SetLocalLong(jthread thread, jint depth, jint slot, jlong value) {
2559 JavaThread* current_thread = JavaThread::current();
2560 // rm object is created to clean up the javaVFrame created in
2561 // doit_prologue(), but after doit() is finished with it.
2562 ResourceMark rm(current_thread);
2563 HandleMark hm(current_thread);
2564 JvmtiVTMSTransitionDisabler disabler;
2565 jvalue val;
2566 val.j = value;
2567
2568 jvmtiError err = JVMTI_ERROR_NONE;
2569 oop thread_obj = current_thread_obj_or_resolve_external_guard(thread);
2570 if (java_lang_VirtualThread::is_instance(thread_obj)) {
2571 VM_VirtualThreadGetOrSetLocal op(this, Handle(current_thread, thread_obj),
2572 depth, slot, T_LONG, val);
2573 VMThread::execute(&op);
2574 err = op.result();
2575 } else {
2576 // Support for ordinary threads
2577 ThreadsListHandle tlh(current_thread);
2578 JavaThread* java_thread = NULL;
2579 err = get_JavaThread(tlh.list(), thread, &java_thread);
2580 if (err != JVMTI_ERROR_NONE) {
2581 return err;
2582 }
2583 VM_GetOrSetLocal op(java_thread, depth, slot, T_LONG, val);
2584 VMThread::execute(&op);
2585 err = op.result();
2586 }
2587 return err;
2588 } /* end SetLocalLong */
2589
2590
2591 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
2592 // depth - pre-checked as non-negative
2593 jvmtiError
2594 JvmtiEnv::SetLocalFloat(jthread thread, jint depth, jint slot, jfloat value) {
2595 JavaThread* current_thread = JavaThread::current();
2596 // rm object is created to clean up the javaVFrame created in
2597 // doit_prologue(), but after doit() is finished with it.
2598 ResourceMark rm(current_thread);
2599 HandleMark hm(current_thread);
2600 JvmtiVTMSTransitionDisabler disabler;
2601 jvalue val;
2602 val.f = value;
2603
2604 jvmtiError err = JVMTI_ERROR_NONE;
2605 oop thread_obj = current_thread_obj_or_resolve_external_guard(thread);
2606 if (java_lang_VirtualThread::is_instance(thread_obj)) {
2607 VM_VirtualThreadGetOrSetLocal op(this, Handle(current_thread, thread_obj),
2608 depth, slot, T_FLOAT, val);
2609 VMThread::execute(&op);
2610 err = op.result();
2611 } else {
2612 // Support for ordinary threads
2613 ThreadsListHandle tlh(current_thread);
2614 JavaThread* java_thread = NULL;
2615 err = get_JavaThread(tlh.list(), thread, &java_thread);
2616 if (err != JVMTI_ERROR_NONE) {
2617 return err;
2618 }
2619 VM_GetOrSetLocal op(java_thread, depth, slot, T_FLOAT, val);
2620 VMThread::execute(&op);
2621 err = op.result();
2622 }
2623 return err;
2624 } /* end SetLocalFloat */
2625
2626
2627 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
2628 // depth - pre-checked as non-negative
2629 jvmtiError
2630 JvmtiEnv::SetLocalDouble(jthread thread, jint depth, jint slot, jdouble value) {
2631 JavaThread* current_thread = JavaThread::current();
2632 // rm object is created to clean up the javaVFrame created in
2633 // doit_prologue(), but after doit() is finished with it.
2634 ResourceMark rm(current_thread);
2635 HandleMark hm(current_thread);
2636 JvmtiVTMSTransitionDisabler disabler;
2637 jvalue val;
2638 val.d = value;
2639
2640 jvmtiError err = JVMTI_ERROR_NONE;
2641 oop thread_obj = current_thread_obj_or_resolve_external_guard(thread);
2642 if (java_lang_VirtualThread::is_instance(thread_obj)) {
2643 VM_VirtualThreadGetOrSetLocal op(this, Handle(current_thread, thread_obj),
2644 depth, slot, T_DOUBLE, val);
2645 VMThread::execute(&op);
2646 err = op.result();
2647 } else {
2648 // Support for ordinary threads
2649 ThreadsListHandle tlh(current_thread);
2650 JavaThread* java_thread = NULL;
2651 err = get_JavaThread(tlh.list(), thread, &java_thread);
2652 if (err != JVMTI_ERROR_NONE) {
2653 return err;
2654 }
2655 VM_GetOrSetLocal op(java_thread, depth, slot, T_DOUBLE, val);
2656 VMThread::execute(&op);
2657 err = op.result();
2658 }
2659 return err;
2660 } /* end SetLocalDouble */
2661
2662
2663 //
2664 // Breakpoint functions
2665 //
2666
2667 // method - pre-checked for validity, but may be NULL meaning obsolete method
2668 jvmtiError
2669 JvmtiEnv::SetBreakpoint(Method* method, jlocation location) {
2670 NULL_CHECK(method, JVMTI_ERROR_INVALID_METHODID);
2671 if (location < 0) { // simple invalid location check first
2672 return JVMTI_ERROR_INVALID_LOCATION;
2673 }
2674 // verify that the breakpoint is not past the end of the method
2675 if (location >= (jlocation) method->code_size()) {
2676 return JVMTI_ERROR_INVALID_LOCATION;
2677 }
2678
2679 ResourceMark rm;
2680 JvmtiBreakpoint bp(method, location);
2681 JvmtiBreakpoints& jvmti_breakpoints = JvmtiCurrentBreakpoints::get_jvmti_breakpoints();
2682 if (jvmti_breakpoints.set(bp) == JVMTI_ERROR_DUPLICATE)
2683 return JVMTI_ERROR_DUPLICATE;
2684
2685 if (TraceJVMTICalls) {
2686 jvmti_breakpoints.print();
2687 }
2688
2689 return JVMTI_ERROR_NONE;
2690 } /* end SetBreakpoint */
2691
2692
2693 // method - pre-checked for validity, but may be NULL meaning obsolete method
2694 jvmtiError
2695 JvmtiEnv::ClearBreakpoint(Method* method, jlocation location) {
2696 NULL_CHECK(method, JVMTI_ERROR_INVALID_METHODID);
2697
2698 if (location < 0) { // simple invalid location check first
2699 return JVMTI_ERROR_INVALID_LOCATION;
2700 }
2701
2702 // verify that the breakpoint is not past the end of the method
2703 if (location >= (jlocation) method->code_size()) {
2704 return JVMTI_ERROR_INVALID_LOCATION;
2705 }
2706
2707 JvmtiBreakpoint bp(method, location);
2708
2709 JvmtiBreakpoints& jvmti_breakpoints = JvmtiCurrentBreakpoints::get_jvmti_breakpoints();
2710 if (jvmti_breakpoints.clear(bp) == JVMTI_ERROR_NOT_FOUND)
2711 return JVMTI_ERROR_NOT_FOUND;
2712
2713 if (TraceJVMTICalls) {
2714 jvmti_breakpoints.print();
2715 }
2716
2717 return JVMTI_ERROR_NONE;
2718 } /* end ClearBreakpoint */
2719
2720
2721 //
2722 // Watched Field functions
2723 //
2724
2725 jvmtiError
2726 JvmtiEnv::SetFieldAccessWatch(fieldDescriptor* fdesc_ptr) {
2727 // make sure we haven't set this watch before
2728 if (fdesc_ptr->is_field_access_watched()) return JVMTI_ERROR_DUPLICATE;
2729 fdesc_ptr->set_is_field_access_watched(true);
2730
2731 JvmtiEventController::change_field_watch(JVMTI_EVENT_FIELD_ACCESS, true);
2732
2733 return JVMTI_ERROR_NONE;
2734 } /* end SetFieldAccessWatch */
2735
2736
2737 jvmtiError
2738 JvmtiEnv::ClearFieldAccessWatch(fieldDescriptor* fdesc_ptr) {
2739 // make sure we have a watch to clear
2740 if (!fdesc_ptr->is_field_access_watched()) return JVMTI_ERROR_NOT_FOUND;
2741 fdesc_ptr->set_is_field_access_watched(false);
2742
2743 JvmtiEventController::change_field_watch(JVMTI_EVENT_FIELD_ACCESS, false);
2744
2745 return JVMTI_ERROR_NONE;
2746 } /* end ClearFieldAccessWatch */
2747
2748
2749 jvmtiError
2750 JvmtiEnv::SetFieldModificationWatch(fieldDescriptor* fdesc_ptr) {
2751 // make sure we haven't set this watch before
2752 if (fdesc_ptr->is_field_modification_watched()) return JVMTI_ERROR_DUPLICATE;
2753 fdesc_ptr->set_is_field_modification_watched(true);
2754
2755 JvmtiEventController::change_field_watch(JVMTI_EVENT_FIELD_MODIFICATION, true);
2756
2757 return JVMTI_ERROR_NONE;
2758 } /* end SetFieldModificationWatch */
2759
2760
2761 jvmtiError
2762 JvmtiEnv::ClearFieldModificationWatch(fieldDescriptor* fdesc_ptr) {
2763 // make sure we have a watch to clear
2764 if (!fdesc_ptr->is_field_modification_watched()) return JVMTI_ERROR_NOT_FOUND;
2765 fdesc_ptr->set_is_field_modification_watched(false);
2766
2767 JvmtiEventController::change_field_watch(JVMTI_EVENT_FIELD_MODIFICATION, false);
2768
2769 return JVMTI_ERROR_NONE;
2770 } /* end ClearFieldModificationWatch */
2771
2772 //
2773 // Class functions
2774 //
2775
2776
2777 // k_mirror - may be primitive, this must be checked
2778 // signature_ptr - NULL is a valid value, must be checked
2779 // generic_ptr - NULL is a valid value, must be checked
2780 jvmtiError
2781 JvmtiEnv::GetClassSignature(oop k_mirror, char** signature_ptr, char** generic_ptr) {
2782 ResourceMark rm;
2783 bool isPrimitive = java_lang_Class::is_primitive(k_mirror);
2784 Klass* k = NULL;
2785 if (!isPrimitive) {
2786 k = java_lang_Class::as_Klass(k_mirror);
2787 NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS);
2788 }
2789 if (signature_ptr != NULL) {
2790 char* result = NULL;
2791 if (isPrimitive) {
2792 char tchar = type2char(java_lang_Class::primitive_type(k_mirror));
2793 result = (char*) jvmtiMalloc(2);
2794 result[0] = tchar;
2795 result[1] = '\0';
2796 } else {
2797 const char* class_sig = k->signature_name();
2798 result = (char *) jvmtiMalloc(strlen(class_sig)+1);
2799 strcpy(result, class_sig);
2800 }
2801 *signature_ptr = result;
2802 }
2803 if (generic_ptr != NULL) {
2804 *generic_ptr = NULL;
2805 if (!isPrimitive && k->is_instance_klass()) {
2806 Symbol* soo = InstanceKlass::cast(k)->generic_signature();
2807 if (soo != NULL) {
2808 const char *gen_sig = soo->as_C_string();
2809 if (gen_sig != NULL) {
2810 char* gen_result;
2811 jvmtiError err = allocate(strlen(gen_sig) + 1,
2812 (unsigned char **)&gen_result);
2813 if (err != JVMTI_ERROR_NONE) {
2814 return err;
2815 }
2816 strcpy(gen_result, gen_sig);
2817 *generic_ptr = gen_result;
2818 }
2819 }
2820 }
2821 }
2822 return JVMTI_ERROR_NONE;
2823 } /* end GetClassSignature */
2824
2825
2826 // k_mirror - may be primitive, this must be checked
2827 // status_ptr - pre-checked for NULL
2828 jvmtiError
2829 JvmtiEnv::GetClassStatus(oop k_mirror, jint* status_ptr) {
2830 jint result = 0;
2831 if (java_lang_Class::is_primitive(k_mirror)) {
2832 result |= JVMTI_CLASS_STATUS_PRIMITIVE;
2833 } else {
2834 Klass* k = java_lang_Class::as_Klass(k_mirror);
2835 NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS);
2836 result = k->jvmti_class_status();
2837 }
2838 *status_ptr = result;
2839
2840 return JVMTI_ERROR_NONE;
2841 } /* end GetClassStatus */
2842
2843
2844 // k_mirror - may be primitive, this must be checked
2845 // source_name_ptr - pre-checked for NULL
2846 jvmtiError
2847 JvmtiEnv::GetSourceFileName(oop k_mirror, char** source_name_ptr) {
2848 if (java_lang_Class::is_primitive(k_mirror)) {
2849 return JVMTI_ERROR_ABSENT_INFORMATION;
2850 }
2851 Klass* k_klass = java_lang_Class::as_Klass(k_mirror);
2852 NULL_CHECK(k_klass, JVMTI_ERROR_INVALID_CLASS);
2853
2854 if (!k_klass->is_instance_klass()) {
2855 return JVMTI_ERROR_ABSENT_INFORMATION;
2856 }
2857
2858 Symbol* sfnOop = InstanceKlass::cast(k_klass)->source_file_name();
2859 NULL_CHECK(sfnOop, JVMTI_ERROR_ABSENT_INFORMATION);
2860 {
2861 JavaThread* current_thread = JavaThread::current();
2862 ResourceMark rm(current_thread);
2863 const char* sfncp = (const char*) sfnOop->as_C_string();
2864 *source_name_ptr = (char *) jvmtiMalloc(strlen(sfncp)+1);
2865 strcpy(*source_name_ptr, sfncp);
2866 }
2867
2868 return JVMTI_ERROR_NONE;
2869 } /* end GetSourceFileName */
2870
2871
2872 // k_mirror - may be primitive, this must be checked
2873 // modifiers_ptr - pre-checked for NULL
2874 jvmtiError
2875 JvmtiEnv::GetClassModifiers(oop k_mirror, jint* modifiers_ptr) {
2876 JavaThread* current_thread = JavaThread::current();
2877 jint result = 0;
2878 if (!java_lang_Class::is_primitive(k_mirror)) {
2879 Klass* k = java_lang_Class::as_Klass(k_mirror);
2880 NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS);
2881 result = k->compute_modifier_flags();
2882
2883 // Reset the deleted ACC_SUPER bit (deleted in compute_modifier_flags()).
2884 // if (k->is_super()) {
2885 // result |= JVM_ACC_SUPER;
2886 // }
2887 } else {
2888 result = (JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC);
2889 }
2890 *modifiers_ptr = result;
2891
2892 return JVMTI_ERROR_NONE;
2893 } /* end GetClassModifiers */
2894
2895
2896 // k_mirror - may be primitive, this must be checked
2897 // method_count_ptr - pre-checked for NULL
2898 // methods_ptr - pre-checked for NULL
2899 jvmtiError
2900 JvmtiEnv::GetClassMethods(oop k_mirror, jint* method_count_ptr, jmethodID** methods_ptr) {
2901 JavaThread* current_thread = JavaThread::current();
2902 HandleMark hm(current_thread);
2903
2904 if (java_lang_Class::is_primitive(k_mirror)) {
2905 *method_count_ptr = 0;
2906 *methods_ptr = (jmethodID*) jvmtiMalloc(0 * sizeof(jmethodID));
2907 return JVMTI_ERROR_NONE;
2908 }
2909 Klass* k = java_lang_Class::as_Klass(k_mirror);
2910 NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS);
2911
2912 // Return CLASS_NOT_PREPARED error as per JVMTI spec.
2913 if (!(k->jvmti_class_status() & (JVMTI_CLASS_STATUS_PREPARED|JVMTI_CLASS_STATUS_ARRAY) )) {
2914 return JVMTI_ERROR_CLASS_NOT_PREPARED;
2915 }
2916
2917 if (!k->is_instance_klass()) {
2918 *method_count_ptr = 0;
2919 *methods_ptr = (jmethodID*) jvmtiMalloc(0 * sizeof(jmethodID));
2920 return JVMTI_ERROR_NONE;
2921 }
2922 InstanceKlass* ik = InstanceKlass::cast(k);
2923 // Allocate the result and fill it in
2924 int result_length = ik->methods()->length();
2925 jmethodID* result_list = (jmethodID*)jvmtiMalloc(result_length * sizeof(jmethodID));
2926 int index;
2927 bool jmethodids_found = true;
2928 int skipped = 0; // skip overpass methods
2929
2930 for (index = 0; index < result_length; index++) {
2931 Method* m = ik->methods()->at(index);
2932 // Depending on can_maintain_original_method_order capability use the original
2933 // method ordering indices stored in the class, so we can emit jmethodIDs in
2934 // the order they appeared in the class file or just copy in current order.
2935 int result_index = JvmtiExport::can_maintain_original_method_order() ? ik->method_ordering()->at(index) : index;
2936 assert(result_index >= 0 && result_index < result_length, "invalid original method index");
2937 if (m->is_overpass()) {
2938 result_list[result_index] = NULL;
2939 skipped++;
2940 continue;
2941 }
2942 jmethodID id;
2943 if (jmethodids_found) {
2944 id = m->find_jmethod_id_or_null();
2945 if (id == NULL) {
2946 // If we find an uninitialized value, make sure there is
2947 // enough space for all the uninitialized values we might
2948 // find.
2949 ik->ensure_space_for_methodids(index);
2950 jmethodids_found = false;
2951 id = m->jmethod_id();
2952 }
2953 } else {
2954 id = m->jmethod_id();
2955 }
2956 result_list[result_index] = id;
2957 }
2958
2959 // Fill in return value.
2960 if (skipped > 0) {
2961 // copy results skipping NULL methodIDs
2962 *methods_ptr = (jmethodID*)jvmtiMalloc((result_length - skipped) * sizeof(jmethodID));
2963 *method_count_ptr = result_length - skipped;
2964 for (index = 0, skipped = 0; index < result_length; index++) {
2965 if (result_list[index] == NULL) {
2966 skipped++;
2967 } else {
2968 (*methods_ptr)[index - skipped] = result_list[index];
2969 }
2970 }
2971 deallocate((unsigned char *)result_list);
2972 } else {
2973 *method_count_ptr = result_length;
2974 *methods_ptr = result_list;
2975 }
2976
2977 return JVMTI_ERROR_NONE;
2978 } /* end GetClassMethods */
2979
2980
2981 // k_mirror - may be primitive, this must be checked
2982 // field_count_ptr - pre-checked for NULL
2983 // fields_ptr - pre-checked for NULL
2984 jvmtiError
2985 JvmtiEnv::GetClassFields(oop k_mirror, jint* field_count_ptr, jfieldID** fields_ptr) {
2986 if (java_lang_Class::is_primitive(k_mirror)) {
2987 *field_count_ptr = 0;
2988 *fields_ptr = (jfieldID*) jvmtiMalloc(0 * sizeof(jfieldID));
2989 return JVMTI_ERROR_NONE;
2990 }
2991 JavaThread* current_thread = JavaThread::current();
2992 HandleMark hm(current_thread);
2993 Klass* k = java_lang_Class::as_Klass(k_mirror);
2994 NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS);
2995
2996 // Return CLASS_NOT_PREPARED error as per JVMTI spec.
2997 if (!(k->jvmti_class_status() & (JVMTI_CLASS_STATUS_PREPARED|JVMTI_CLASS_STATUS_ARRAY) )) {
2998 return JVMTI_ERROR_CLASS_NOT_PREPARED;
2999 }
3000
3001 if (!k->is_instance_klass()) {
3002 *field_count_ptr = 0;
3003 *fields_ptr = (jfieldID*) jvmtiMalloc(0 * sizeof(jfieldID));
3004 return JVMTI_ERROR_NONE;
3005 }
3006
3007
3008 InstanceKlass* ik = InstanceKlass::cast(k);
3009
3010 int result_count = 0;
3011 // First, count the fields.
3012 FilteredFieldStream flds(ik, true, true);
3013 result_count = flds.field_count();
3014
3015 // Allocate the result and fill it in
3016 jfieldID* result_list = (jfieldID*) jvmtiMalloc(result_count * sizeof(jfieldID));
3017 // The JVMTI spec requires fields in the order they occur in the class file,
3018 // this is the reverse order of what FieldStream hands out.
3019 int id_index = (result_count - 1);
3020
3021 for (FilteredFieldStream src_st(ik, true, true); !src_st.eos(); src_st.next()) {
3022 result_list[id_index--] = jfieldIDWorkaround::to_jfieldID(
3023 ik, src_st.offset(),
3024 src_st.access_flags().is_static(),
3025 src_st.field_descriptor().is_inlined());
3026 }
3027 assert(id_index == -1, "just checking");
3028 // Fill in the results
3029 *field_count_ptr = result_count;
3030 *fields_ptr = result_list;
3031
3032 return JVMTI_ERROR_NONE;
3033 } /* end GetClassFields */
3034
3035
3036 // k_mirror - may be primitive, this must be checked
3037 // interface_count_ptr - pre-checked for NULL
3038 // interfaces_ptr - pre-checked for NULL
3039 jvmtiError
3040 JvmtiEnv::GetImplementedInterfaces(oop k_mirror, jint* interface_count_ptr, jclass** interfaces_ptr) {
3041 {
3042 if (java_lang_Class::is_primitive(k_mirror)) {
3043 *interface_count_ptr = 0;
3044 *interfaces_ptr = (jclass*) jvmtiMalloc(0 * sizeof(jclass));
3045 return JVMTI_ERROR_NONE;
3046 }
3047 JavaThread* current_thread = JavaThread::current();
3048 HandleMark hm(current_thread);
3049 Klass* k = java_lang_Class::as_Klass(k_mirror);
3050 NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS);
3051
3052 // Return CLASS_NOT_PREPARED error as per JVMTI spec.
3053 if (!(k->jvmti_class_status() & (JVMTI_CLASS_STATUS_PREPARED|JVMTI_CLASS_STATUS_ARRAY) ))
3054 return JVMTI_ERROR_CLASS_NOT_PREPARED;
3055
3056 if (!k->is_instance_klass()) {
3057 *interface_count_ptr = 0;
3058 *interfaces_ptr = (jclass*) jvmtiMalloc(0 * sizeof(jclass));
3059 return JVMTI_ERROR_NONE;
3060 }
3061
3062 InstanceKlass* ik = InstanceKlass::cast(k);
3063 Array<InstanceKlass*>* interface_list = ik->local_interfaces();
3064 int result_length = (interface_list == NULL ? 0 : interface_list->length());
3065 jclass* result_list = (jclass*) jvmtiMalloc(result_length * sizeof(jclass));
3066 for (int i_index = 0; i_index < result_length; i_index += 1) {
3067 InstanceKlass* klass_at = interface_list->at(i_index);
3068 assert(klass_at->is_klass(), "interfaces must be Klass*s");
3069 assert(klass_at->is_interface(), "interfaces must be interfaces");
3070 oop mirror_at = klass_at->java_mirror();
3071 Handle handle_at = Handle(current_thread, mirror_at);
3072 result_list[i_index] = (jclass) jni_reference(handle_at);
3073 }
3074 *interface_count_ptr = result_length;
3075 *interfaces_ptr = result_list;
3076 }
3077
3078 return JVMTI_ERROR_NONE;
3079 } /* end GetImplementedInterfaces */
3080
3081
3082 // k_mirror - may be primitive, this must be checked
3083 // minor_version_ptr - pre-checked for NULL
3084 // major_version_ptr - pre-checked for NULL
3085 jvmtiError
3086 JvmtiEnv::GetClassVersionNumbers(oop k_mirror, jint* minor_version_ptr, jint* major_version_ptr) {
3087 if (java_lang_Class::is_primitive(k_mirror)) {
3088 return JVMTI_ERROR_ABSENT_INFORMATION;
3089 }
3090 Klass* klass = java_lang_Class::as_Klass(k_mirror);
3091
3092 jint status = klass->jvmti_class_status();
3093 if (status & (JVMTI_CLASS_STATUS_ERROR)) {
3094 return JVMTI_ERROR_INVALID_CLASS;
3095 }
3096 if (status & (JVMTI_CLASS_STATUS_ARRAY)) {
3097 return JVMTI_ERROR_ABSENT_INFORMATION;
3098 }
3099
3100 InstanceKlass* ik = InstanceKlass::cast(klass);
3101 *minor_version_ptr = ik->minor_version();
3102 *major_version_ptr = ik->major_version();
3103
3104 return JVMTI_ERROR_NONE;
3105 } /* end GetClassVersionNumbers */
3106
3107
3108 // k_mirror - may be primitive, this must be checked
3109 // constant_pool_count_ptr - pre-checked for NULL
3110 // constant_pool_byte_count_ptr - pre-checked for NULL
3111 // constant_pool_bytes_ptr - pre-checked for NULL
3112 jvmtiError
3113 JvmtiEnv::GetConstantPool(oop k_mirror, jint* constant_pool_count_ptr, jint* constant_pool_byte_count_ptr, unsigned char** constant_pool_bytes_ptr) {
3114 if (java_lang_Class::is_primitive(k_mirror)) {
3115 return JVMTI_ERROR_ABSENT_INFORMATION;
3116 }
3117
3118 Klass* klass = java_lang_Class::as_Klass(k_mirror);
3119 Thread *thread = Thread::current();
3120 ResourceMark rm(thread);
3121
3122 jint status = klass->jvmti_class_status();
3123 if (status & (JVMTI_CLASS_STATUS_ERROR)) {
3124 return JVMTI_ERROR_INVALID_CLASS;
3125 }
3126 if (status & (JVMTI_CLASS_STATUS_ARRAY)) {
3127 return JVMTI_ERROR_ABSENT_INFORMATION;
3128 }
3129
3130 InstanceKlass* ik = InstanceKlass::cast(klass);
3131 JvmtiConstantPoolReconstituter reconstituter(ik);
3132 if (reconstituter.get_error() != JVMTI_ERROR_NONE) {
3133 return reconstituter.get_error();
3134 }
3135
3136 unsigned char *cpool_bytes;
3137 int cpool_size = reconstituter.cpool_size();
3138 if (reconstituter.get_error() != JVMTI_ERROR_NONE) {
3139 return reconstituter.get_error();
3140 }
3141 jvmtiError res = allocate(cpool_size, &cpool_bytes);
3142 if (res != JVMTI_ERROR_NONE) {
3143 return res;
3144 }
3145 reconstituter.copy_cpool_bytes(cpool_bytes);
3146 if (reconstituter.get_error() != JVMTI_ERROR_NONE) {
3147 return reconstituter.get_error();
3148 }
3149
3150 constantPoolHandle constants(thread, ik->constants());
3151 *constant_pool_count_ptr = constants->length();
3152 *constant_pool_byte_count_ptr = cpool_size;
3153 *constant_pool_bytes_ptr = cpool_bytes;
3154
3155 return JVMTI_ERROR_NONE;
3156 } /* end GetConstantPool */
3157
3158
3159 // k_mirror - may be primitive, this must be checked
3160 // is_interface_ptr - pre-checked for NULL
3161 jvmtiError
3162 JvmtiEnv::IsInterface(oop k_mirror, jboolean* is_interface_ptr) {
3163 {
3164 bool result = false;
3165 if (!java_lang_Class::is_primitive(k_mirror)) {
3166 Klass* k = java_lang_Class::as_Klass(k_mirror);
3167 if (k != NULL && k->is_interface()) {
3168 result = true;
3169 }
3170 }
3171 *is_interface_ptr = result;
3172 }
3173
3174 return JVMTI_ERROR_NONE;
3175 } /* end IsInterface */
3176
3177
3178 // k_mirror - may be primitive, this must be checked
3179 // is_array_class_ptr - pre-checked for NULL
3180 jvmtiError
3181 JvmtiEnv::IsArrayClass(oop k_mirror, jboolean* is_array_class_ptr) {
3182 {
3183 bool result = false;
3184 if (!java_lang_Class::is_primitive(k_mirror)) {
3185 Klass* k = java_lang_Class::as_Klass(k_mirror);
3186 if (k != NULL && k->is_array_klass()) {
3187 result = true;
3188 }
3189 }
3190 *is_array_class_ptr = result;
3191 }
3192
3193 return JVMTI_ERROR_NONE;
3194 } /* end IsArrayClass */
3195
3196
3197 // k_mirror - may be primitive, this must be checked
3198 // classloader_ptr - pre-checked for NULL
3199 jvmtiError
3200 JvmtiEnv::GetClassLoader(oop k_mirror, jobject* classloader_ptr) {
3201 {
3202 if (java_lang_Class::is_primitive(k_mirror)) {
3203 *classloader_ptr = (jclass) jni_reference(Handle());
3204 return JVMTI_ERROR_NONE;
3205 }
3206 JavaThread* current_thread = JavaThread::current();
3207 HandleMark hm(current_thread);
3208 Klass* k = java_lang_Class::as_Klass(k_mirror);
3209 NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS);
3210
3211 oop result_oop = k->class_loader();
3212 if (result_oop == NULL) {
3213 *classloader_ptr = (jclass) jni_reference(Handle());
3214 return JVMTI_ERROR_NONE;
3215 }
3216 Handle result_handle = Handle(current_thread, result_oop);
3217 jclass result_jnihandle = (jclass) jni_reference(result_handle);
3218 *classloader_ptr = result_jnihandle;
3219 }
3220 return JVMTI_ERROR_NONE;
3221 } /* end GetClassLoader */
3222
3223
3224 // k_mirror - may be primitive, this must be checked
3225 // source_debug_extension_ptr - pre-checked for NULL
3226 jvmtiError
3227 JvmtiEnv::GetSourceDebugExtension(oop k_mirror, char** source_debug_extension_ptr) {
3228 {
3229 if (java_lang_Class::is_primitive(k_mirror)) {
3230 return JVMTI_ERROR_ABSENT_INFORMATION;
3231 }
3232 Klass* k = java_lang_Class::as_Klass(k_mirror);
3233 NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS);
3234 if (!k->is_instance_klass()) {
3235 return JVMTI_ERROR_ABSENT_INFORMATION;
3236 }
3237 const char* sde = InstanceKlass::cast(k)->source_debug_extension();
3238 NULL_CHECK(sde, JVMTI_ERROR_ABSENT_INFORMATION);
3239
3240 {
3241 *source_debug_extension_ptr = (char *) jvmtiMalloc(strlen(sde)+1);
3242 strcpy(*source_debug_extension_ptr, sde);
3243 }
3244 }
3245
3246 return JVMTI_ERROR_NONE;
3247 } /* end GetSourceDebugExtension */
3248
3249 //
3250 // Object functions
3251 //
3252
3253 // hash_code_ptr - pre-checked for NULL
3254 jvmtiError
3255 JvmtiEnv::GetObjectHashCode(jobject object, jint* hash_code_ptr) {
3256 oop mirror = JNIHandles::resolve_external_guard(object);
3257 NULL_CHECK(mirror, JVMTI_ERROR_INVALID_OBJECT);
3258 NULL_CHECK(hash_code_ptr, JVMTI_ERROR_NULL_POINTER);
3259
3260 {
3261 jint result = (jint) mirror->identity_hash();
3262 *hash_code_ptr = result;
3263 }
3264 return JVMTI_ERROR_NONE;
3265 } /* end GetObjectHashCode */
3266
3267
3268 // info_ptr - pre-checked for NULL
3269 jvmtiError
3270 JvmtiEnv::GetObjectMonitorUsage(jobject object, jvmtiMonitorUsage* info_ptr) {
3271 // This needs to be performed at a safepoint to gather stable data
3272 // because monitor owner / waiters might not be suspended.
3273 VM_GetObjectMonitorUsage op(this, JavaThread::current(), object, info_ptr);
3274 VMThread::execute(&op);
3275 return op.result();
3276 } /* end GetObjectMonitorUsage */
3277
3278
3279 //
3280 // Field functions
3281 //
3282
3283 // name_ptr - NULL is a valid value, must be checked
3284 // signature_ptr - NULL is a valid value, must be checked
3285 // generic_ptr - NULL is a valid value, must be checked
3286 jvmtiError
3287 JvmtiEnv::GetFieldName(fieldDescriptor* fdesc_ptr, char** name_ptr, char** signature_ptr, char** generic_ptr) {
3288 JavaThread* current_thread = JavaThread::current();
3289 ResourceMark rm(current_thread);
3290 if (name_ptr == NULL) {
3291 // just don't return the name
3292 } else {
3293 const char* fieldName = fdesc_ptr->name()->as_C_string();
3294 *name_ptr = (char*) jvmtiMalloc(strlen(fieldName) + 1);
3295 if (*name_ptr == NULL)
3296 return JVMTI_ERROR_OUT_OF_MEMORY;
3297 strcpy(*name_ptr, fieldName);
3298 }
3299 if (signature_ptr== NULL) {
3300 // just don't return the signature
3301 } else {
3302 const char* fieldSignature = fdesc_ptr->signature()->as_C_string();
3303 *signature_ptr = (char*) jvmtiMalloc(strlen(fieldSignature) + 1);
3304 if (*signature_ptr == NULL)
3305 return JVMTI_ERROR_OUT_OF_MEMORY;
3306 strcpy(*signature_ptr, fieldSignature);
3307 }
3308 if (generic_ptr != NULL) {
3309 *generic_ptr = NULL;
3310 Symbol* soop = fdesc_ptr->generic_signature();
3311 if (soop != NULL) {
3312 const char* gen_sig = soop->as_C_string();
3313 if (gen_sig != NULL) {
3314 jvmtiError err = allocate(strlen(gen_sig) + 1, (unsigned char **)generic_ptr);
3315 if (err != JVMTI_ERROR_NONE) {
3316 return err;
3317 }
3318 strcpy(*generic_ptr, gen_sig);
3319 }
3320 }
3321 }
3322 return JVMTI_ERROR_NONE;
3323 } /* end GetFieldName */
3324
3325
3326 // declaring_class_ptr - pre-checked for NULL
3327 jvmtiError
3328 JvmtiEnv::GetFieldDeclaringClass(fieldDescriptor* fdesc_ptr, jclass* declaring_class_ptr) {
3329
3330 *declaring_class_ptr = get_jni_class_non_null(fdesc_ptr->field_holder());
3331 return JVMTI_ERROR_NONE;
3332 } /* end GetFieldDeclaringClass */
3333
3334
3335 // modifiers_ptr - pre-checked for NULL
3336 jvmtiError
3337 JvmtiEnv::GetFieldModifiers(fieldDescriptor* fdesc_ptr, jint* modifiers_ptr) {
3338
3339 AccessFlags resultFlags = fdesc_ptr->access_flags();
3340 jint result = resultFlags.as_int();
3341 *modifiers_ptr = result;
3342
3343 return JVMTI_ERROR_NONE;
3344 } /* end GetFieldModifiers */
3345
3346
3347 // is_synthetic_ptr - pre-checked for NULL
3348 jvmtiError
3349 JvmtiEnv::IsFieldSynthetic(fieldDescriptor* fdesc_ptr, jboolean* is_synthetic_ptr) {
3350 *is_synthetic_ptr = fdesc_ptr->is_synthetic();
3351 return JVMTI_ERROR_NONE;
3352 } /* end IsFieldSynthetic */
3353
3354
3355 //
3356 // Method functions
3357 //
3358
3359 // method - pre-checked for validity, but may be NULL meaning obsolete method
3360 // name_ptr - NULL is a valid value, must be checked
3361 // signature_ptr - NULL is a valid value, must be checked
3362 // generic_ptr - NULL is a valid value, must be checked
3363 jvmtiError
3364 JvmtiEnv::GetMethodName(Method* method, char** name_ptr, char** signature_ptr, char** generic_ptr) {
3365 NULL_CHECK(method, JVMTI_ERROR_INVALID_METHODID);
3366 JavaThread* current_thread = JavaThread::current();
3367
3368 ResourceMark rm(current_thread); // get the utf8 name and signature
3369 if (name_ptr == NULL) {
3370 // just don't return the name
3371 } else {
3372 const char* utf8_name = (const char *) method->name()->as_utf8();
3373 *name_ptr = (char *) jvmtiMalloc(strlen(utf8_name)+1);
3374 strcpy(*name_ptr, utf8_name);
3375 }
3376 if (signature_ptr == NULL) {
3377 // just don't return the signature
3378 } else {
3379 const char* utf8_signature = (const char *) method->signature()->as_utf8();
3380 *signature_ptr = (char *) jvmtiMalloc(strlen(utf8_signature) + 1);
3381 strcpy(*signature_ptr, utf8_signature);
3382 }
3383
3384 if (generic_ptr != NULL) {
3385 *generic_ptr = NULL;
3386 Symbol* soop = method->generic_signature();
3387 if (soop != NULL) {
3388 const char* gen_sig = soop->as_C_string();
3389 if (gen_sig != NULL) {
3390 jvmtiError err = allocate(strlen(gen_sig) + 1, (unsigned char **)generic_ptr);
3391 if (err != JVMTI_ERROR_NONE) {
3392 return err;
3393 }
3394 strcpy(*generic_ptr, gen_sig);
3395 }
3396 }
3397 }
3398 return JVMTI_ERROR_NONE;
3399 } /* end GetMethodName */
3400
3401
3402 // method - pre-checked for validity, but may be NULL meaning obsolete method
3403 // declaring_class_ptr - pre-checked for NULL
3404 jvmtiError
3405 JvmtiEnv::GetMethodDeclaringClass(Method* method, jclass* declaring_class_ptr) {
3406 NULL_CHECK(method, JVMTI_ERROR_INVALID_METHODID);
3407 (*declaring_class_ptr) = get_jni_class_non_null(method->method_holder());
3408 return JVMTI_ERROR_NONE;
3409 } /* end GetMethodDeclaringClass */
3410
3411
3412 // method - pre-checked for validity, but may be NULL meaning obsolete method
3413 // modifiers_ptr - pre-checked for NULL
3414 jvmtiError
3415 JvmtiEnv::GetMethodModifiers(Method* method, jint* modifiers_ptr) {
3416 NULL_CHECK(method, JVMTI_ERROR_INVALID_METHODID);
3417 (*modifiers_ptr) = method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
3418 return JVMTI_ERROR_NONE;
3419 } /* end GetMethodModifiers */
3420
3421
3422 // method - pre-checked for validity, but may be NULL meaning obsolete method
3423 // max_ptr - pre-checked for NULL
3424 jvmtiError
3425 JvmtiEnv::GetMaxLocals(Method* method, jint* max_ptr) {
3426 NULL_CHECK(method, JVMTI_ERROR_INVALID_METHODID);
3427 // get max stack
3428 (*max_ptr) = method->max_locals();
3429 return JVMTI_ERROR_NONE;
3430 } /* end GetMaxLocals */
3431
3432
3433 // method - pre-checked for validity, but may be NULL meaning obsolete method
3434 // size_ptr - pre-checked for NULL
3435 jvmtiError
3436 JvmtiEnv::GetArgumentsSize(Method* method, jint* size_ptr) {
3437 NULL_CHECK(method, JVMTI_ERROR_INVALID_METHODID);
3438 // get size of arguments
3439
3440 (*size_ptr) = method->size_of_parameters();
3441 return JVMTI_ERROR_NONE;
3442 } /* end GetArgumentsSize */
3443
3444
3445 // method - pre-checked for validity, but may be NULL meaning obsolete method
3446 // entry_count_ptr - pre-checked for NULL
3447 // table_ptr - pre-checked for NULL
3448 jvmtiError
3449 JvmtiEnv::GetLineNumberTable(Method* method, jint* entry_count_ptr, jvmtiLineNumberEntry** table_ptr) {
3450 NULL_CHECK(method, JVMTI_ERROR_INVALID_METHODID);
3451 if (!method->has_linenumber_table()) {
3452 return (JVMTI_ERROR_ABSENT_INFORMATION);
3453 }
3454
3455 // The line number table is compressed so we don't know how big it is until decompressed.
3456 // Decompression is really fast so we just do it twice.
3457
3458 // Compute size of table
3459 jint num_entries = 0;
3460 CompressedLineNumberReadStream stream(method->compressed_linenumber_table());
3461 while (stream.read_pair()) {
3462 num_entries++;
3463 }
3464 jvmtiLineNumberEntry *jvmti_table =
3465 (jvmtiLineNumberEntry *)jvmtiMalloc(num_entries * (sizeof(jvmtiLineNumberEntry)));
3466
3467 // Fill jvmti table
3468 if (num_entries > 0) {
3469 int index = 0;
3470 CompressedLineNumberReadStream stream(method->compressed_linenumber_table());
3471 while (stream.read_pair()) {
3472 jvmti_table[index].start_location = (jlocation) stream.bci();
3473 jvmti_table[index].line_number = (jint) stream.line();
3474 index++;
3475 }
3476 assert(index == num_entries, "sanity check");
3477 }
3478
3479 // Set up results
3480 (*entry_count_ptr) = num_entries;
3481 (*table_ptr) = jvmti_table;
3482
3483 return JVMTI_ERROR_NONE;
3484 } /* end GetLineNumberTable */
3485
3486
3487 // method - pre-checked for validity, but may be NULL meaning obsolete method
3488 // start_location_ptr - pre-checked for NULL
3489 // end_location_ptr - pre-checked for NULL
3490 jvmtiError
3491 JvmtiEnv::GetMethodLocation(Method* method, jlocation* start_location_ptr, jlocation* end_location_ptr) {
3492
3493 NULL_CHECK(method, JVMTI_ERROR_INVALID_METHODID);
3494 // get start and end location
3495 (*end_location_ptr) = (jlocation) (method->code_size() - 1);
3496 if (method->code_size() == 0) {
3497 // there is no code so there is no start location
3498 (*start_location_ptr) = (jlocation)(-1);
3499 } else {
3500 (*start_location_ptr) = (jlocation)(0);
3501 }
3502
3503 return JVMTI_ERROR_NONE;
3504 } /* end GetMethodLocation */
3505
3506
3507 // method - pre-checked for validity, but may be NULL meaning obsolete method
3508 // entry_count_ptr - pre-checked for NULL
3509 // table_ptr - pre-checked for NULL
3510 jvmtiError
3511 JvmtiEnv::GetLocalVariableTable(Method* method, jint* entry_count_ptr, jvmtiLocalVariableEntry** table_ptr) {
3512
3513 NULL_CHECK(method, JVMTI_ERROR_INVALID_METHODID);
3514 JavaThread* current_thread = JavaThread::current();
3515
3516 // does the klass have any local variable information?
3517 InstanceKlass* ik = method->method_holder();
3518 if (!ik->access_flags().has_localvariable_table()) {
3519 return (JVMTI_ERROR_ABSENT_INFORMATION);
3520 }
3521
3522 ConstantPool* constants = method->constants();
3523 NULL_CHECK(constants, JVMTI_ERROR_ABSENT_INFORMATION);
3524
3525 // in the vm localvariable table representation, 6 consecutive elements in the table
3526 // represent a 6-tuple of shorts
3527 // [start_pc, length, name_index, descriptor_index, signature_index, index]
3528 jint num_entries = method->localvariable_table_length();
3529 jvmtiLocalVariableEntry *jvmti_table = (jvmtiLocalVariableEntry *)
3530 jvmtiMalloc(num_entries * (sizeof(jvmtiLocalVariableEntry)));
3531
3532 if (num_entries > 0) {
3533 LocalVariableTableElement* table = method->localvariable_table_start();
3534 for (int i = 0; i < num_entries; i++) {
3535 // get the 5 tuple information from the vm table
3536 jlocation start_location = (jlocation) table[i].start_bci;
3537 jint length = (jint) table[i].length;
3538 int name_index = (int) table[i].name_cp_index;
3539 int signature_index = (int) table[i].descriptor_cp_index;
3540 int generic_signature_index = (int) table[i].signature_cp_index;
3541 jint slot = (jint) table[i].slot;
3542
3543 // get utf8 name and signature
3544 char *name_buf = NULL;
3545 char *sig_buf = NULL;
3546 char *gen_sig_buf = NULL;
3547 {
3548 ResourceMark rm(current_thread);
3549
3550 const char *utf8_name = (const char *) constants->symbol_at(name_index)->as_utf8();
3551 name_buf = (char *) jvmtiMalloc(strlen(utf8_name)+1);
3552 strcpy(name_buf, utf8_name);
3553
3554 const char *utf8_signature = (const char *) constants->symbol_at(signature_index)->as_utf8();
3555 sig_buf = (char *) jvmtiMalloc(strlen(utf8_signature)+1);
3556 strcpy(sig_buf, utf8_signature);
3557
3558 if (generic_signature_index > 0) {
3559 const char *utf8_gen_sign = (const char *)
3560 constants->symbol_at(generic_signature_index)->as_utf8();
3561 gen_sig_buf = (char *) jvmtiMalloc(strlen(utf8_gen_sign)+1);
3562 strcpy(gen_sig_buf, utf8_gen_sign);
3563 }
3564 }
3565
3566 // fill in the jvmti local variable table
3567 jvmti_table[i].start_location = start_location;
3568 jvmti_table[i].length = length;
3569 jvmti_table[i].name = name_buf;
3570 jvmti_table[i].signature = sig_buf;
3571 jvmti_table[i].generic_signature = gen_sig_buf;
3572 jvmti_table[i].slot = slot;
3573 }
3574 }
3575
3576 // set results
3577 (*entry_count_ptr) = num_entries;
3578 (*table_ptr) = jvmti_table;
3579
3580 return JVMTI_ERROR_NONE;
3581 } /* end GetLocalVariableTable */
3582
3583
3584 // method - pre-checked for validity, but may be NULL meaning obsolete method
3585 // bytecode_count_ptr - pre-checked for NULL
3586 // bytecodes_ptr - pre-checked for NULL
3587 jvmtiError
3588 JvmtiEnv::GetBytecodes(Method* method, jint* bytecode_count_ptr, unsigned char** bytecodes_ptr) {
3589 NULL_CHECK(method, JVMTI_ERROR_INVALID_METHODID);
3590
3591 methodHandle mh(Thread::current(), method);
3592 jint size = (jint)mh->code_size();
3593 jvmtiError err = allocate(size, bytecodes_ptr);
3594 if (err != JVMTI_ERROR_NONE) {
3595 return err;
3596 }
3597
3598 (*bytecode_count_ptr) = size;
3599 // get byte codes
3600 JvmtiClassFileReconstituter::copy_bytecodes(mh, *bytecodes_ptr);
3601
3602 return JVMTI_ERROR_NONE;
3603 } /* end GetBytecodes */
3604
3605
3606 // method - pre-checked for validity, but may be NULL meaning obsolete method
3607 // is_native_ptr - pre-checked for NULL
3608 jvmtiError
3609 JvmtiEnv::IsMethodNative(Method* method, jboolean* is_native_ptr) {
3610 NULL_CHECK(method, JVMTI_ERROR_INVALID_METHODID);
3611 (*is_native_ptr) = method->is_native();
3612 return JVMTI_ERROR_NONE;
3613 } /* end IsMethodNative */
3614
3615
3616 // method - pre-checked for validity, but may be NULL meaning obsolete method
3617 // is_synthetic_ptr - pre-checked for NULL
3618 jvmtiError
3619 JvmtiEnv::IsMethodSynthetic(Method* method, jboolean* is_synthetic_ptr) {
3620 NULL_CHECK(method, JVMTI_ERROR_INVALID_METHODID);
3621 (*is_synthetic_ptr) = method->is_synthetic();
3622 return JVMTI_ERROR_NONE;
3623 } /* end IsMethodSynthetic */
3624
3625
3626 // method - pre-checked for validity, but may be NULL meaning obsolete method
3627 // is_obsolete_ptr - pre-checked for NULL
3628 jvmtiError
3629 JvmtiEnv::IsMethodObsolete(Method* method, jboolean* is_obsolete_ptr) {
3630 if (use_version_1_0_semantics() &&
3631 get_capabilities()->can_redefine_classes == 0) {
3632 // This JvmtiEnv requested version 1.0 semantics and this function
3633 // requires the can_redefine_classes capability in version 1.0 so
3634 // we need to return an error here.
3635 return JVMTI_ERROR_MUST_POSSESS_CAPABILITY;
3636 }
3637
3638 if (method == NULL || method->is_obsolete()) {
3639 *is_obsolete_ptr = true;
3640 } else {
3641 *is_obsolete_ptr = false;
3642 }
3643 return JVMTI_ERROR_NONE;
3644 } /* end IsMethodObsolete */
3645
3646 //
3647 // Raw Monitor functions
3648 //
3649
3650 // name - pre-checked for NULL
3651 // monitor_ptr - pre-checked for NULL
3652 jvmtiError
3653 JvmtiEnv::CreateRawMonitor(const char* name, jrawMonitorID* monitor_ptr) {
3654 JvmtiRawMonitor* rmonitor = new JvmtiRawMonitor(name);
3655 NULL_CHECK(rmonitor, JVMTI_ERROR_OUT_OF_MEMORY);
3656
3657 *monitor_ptr = (jrawMonitorID)rmonitor;
3658
3659 return JVMTI_ERROR_NONE;
3660 } /* end CreateRawMonitor */
3661
3662
3663 // rmonitor - pre-checked for validity
3664 jvmtiError
3665 JvmtiEnv::DestroyRawMonitor(JvmtiRawMonitor * rmonitor) {
3666 if (Threads::number_of_threads() == 0) {
3667 // Remove this monitor from pending raw monitors list
3668 // if it has entered in onload or start phase.
3669 JvmtiPendingMonitors::destroy(rmonitor);
3670 } else {
3671 Thread* thread = Thread::current();
3672 if (rmonitor->owner() == thread) {
3673 // The caller owns this monitor which we are about to destroy.
3674 // We exit the underlying synchronization object so that the
3675 // "delete monitor" call below can work without an assertion
3676 // failure on systems that don't like destroying synchronization
3677 // objects that are locked.
3678 int r;
3679 int recursion = rmonitor->recursions();
3680 for (int i = 0; i <= recursion; i++) {
3681 r = rmonitor->raw_exit(thread);
3682 assert(r == JvmtiRawMonitor::M_OK, "raw_exit should have worked");
3683 if (r != JvmtiRawMonitor::M_OK) { // robustness
3684 return JVMTI_ERROR_INTERNAL;
3685 }
3686 }
3687 }
3688 if (rmonitor->owner() != NULL) {
3689 // The caller is trying to destroy a monitor that is locked by
3690 // someone else. While this is not forbidden by the JVMTI
3691 // spec, it will cause an assertion failure on systems that don't
3692 // like destroying synchronization objects that are locked.
3693 // We indicate a problem with the error return (and leak the
3694 // monitor's memory).
3695 return JVMTI_ERROR_NOT_MONITOR_OWNER;
3696 }
3697 }
3698
3699 delete rmonitor;
3700
3701 return JVMTI_ERROR_NONE;
3702 } /* end DestroyRawMonitor */
3703
3704
3705 // rmonitor - pre-checked for validity
3706 jvmtiError
3707 JvmtiEnv::RawMonitorEnter(JvmtiRawMonitor * rmonitor) {
3708 if (Threads::number_of_threads() == 0) {
3709 // No JavaThreads exist so JvmtiRawMonitor enter cannot be
3710 // used, add this raw monitor to the pending list.
3711 // The pending monitors will be actually entered when
3712 // the VM is setup.
3713 // See transition_pending_raw_monitors in create_vm()
3714 // in thread.cpp.
3715 JvmtiPendingMonitors::enter(rmonitor);
3716 } else {
3717 Thread* thread = Thread::current();
3718 // 8266889: raw_enter changes Java thread state, needs WXWrite
3719 MACOS_AARCH64_ONLY(ThreadWXEnable __wx(WXWrite, thread));
3720 rmonitor->raw_enter(thread);
3721 }
3722 return JVMTI_ERROR_NONE;
3723 } /* end RawMonitorEnter */
3724
3725
3726 // rmonitor - pre-checked for validity
3727 jvmtiError
3728 JvmtiEnv::RawMonitorExit(JvmtiRawMonitor * rmonitor) {
3729 jvmtiError err = JVMTI_ERROR_NONE;
3730
3731 if (Threads::number_of_threads() == 0) {
3732 // No JavaThreads exist so just remove this monitor from the pending list.
3733 // Bool value from exit is false if rmonitor is not in the list.
3734 if (!JvmtiPendingMonitors::exit(rmonitor)) {
3735 err = JVMTI_ERROR_NOT_MONITOR_OWNER;
3736 }
3737 } else {
3738 Thread* thread = Thread::current();
3739 int r = rmonitor->raw_exit(thread);
3740 if (r == JvmtiRawMonitor::M_ILLEGAL_MONITOR_STATE) {
3741 err = JVMTI_ERROR_NOT_MONITOR_OWNER;
3742 }
3743 }
3744 return err;
3745 } /* end RawMonitorExit */
3746
3747
3748 // rmonitor - pre-checked for validity
3749 jvmtiError
3750 JvmtiEnv::RawMonitorWait(JvmtiRawMonitor * rmonitor, jlong millis) {
3751 Thread* thread = Thread::current();
3752 // 8266889: raw_wait changes Java thread state, needs WXWrite
3753 MACOS_AARCH64_ONLY(ThreadWXEnable __wx(WXWrite, thread));
3754 int r = rmonitor->raw_wait(millis, thread);
3755
3756 switch (r) {
3757 case JvmtiRawMonitor::M_INTERRUPTED:
3758 return JVMTI_ERROR_INTERRUPT;
3759 case JvmtiRawMonitor::M_ILLEGAL_MONITOR_STATE:
3760 return JVMTI_ERROR_NOT_MONITOR_OWNER;
3761 default:
3762 return JVMTI_ERROR_NONE;
3763 }
3764 } /* end RawMonitorWait */
3765
3766
3767 // rmonitor - pre-checked for validity
3768 jvmtiError
3769 JvmtiEnv::RawMonitorNotify(JvmtiRawMonitor * rmonitor) {
3770 Thread* thread = Thread::current();
3771 int r = rmonitor->raw_notify(thread);
3772
3773 if (r == JvmtiRawMonitor::M_ILLEGAL_MONITOR_STATE) {
3774 return JVMTI_ERROR_NOT_MONITOR_OWNER;
3775 }
3776 return JVMTI_ERROR_NONE;
3777 } /* end RawMonitorNotify */
3778
3779
3780 // rmonitor - pre-checked for validity
3781 jvmtiError
3782 JvmtiEnv::RawMonitorNotifyAll(JvmtiRawMonitor * rmonitor) {
3783 Thread* thread = Thread::current();
3784 int r = rmonitor->raw_notifyAll(thread);
3785
3786 if (r == JvmtiRawMonitor::M_ILLEGAL_MONITOR_STATE) {
3787 return JVMTI_ERROR_NOT_MONITOR_OWNER;
3788 }
3789 return JVMTI_ERROR_NONE;
3790 } /* end RawMonitorNotifyAll */
3791
3792
3793 //
3794 // JNI Function Interception functions
3795 //
3796
3797
3798 // function_table - pre-checked for NULL
3799 jvmtiError
3800 JvmtiEnv::SetJNIFunctionTable(const jniNativeInterface* function_table) {
3801 // Copy jni function table at safepoint.
3802 VM_JNIFunctionTableCopier copier(function_table);
3803 VMThread::execute(&copier);
3804
3805 return JVMTI_ERROR_NONE;
3806 } /* end SetJNIFunctionTable */
3807
3808
3809 // function_table - pre-checked for NULL
3810 jvmtiError
3811 JvmtiEnv::GetJNIFunctionTable(jniNativeInterface** function_table) {
3812 *function_table=(jniNativeInterface*)jvmtiMalloc(sizeof(jniNativeInterface));
3813 if (*function_table == NULL)
3814 return JVMTI_ERROR_OUT_OF_MEMORY;
3815 memcpy(*function_table,(JavaThread::current())->get_jni_functions(),sizeof(jniNativeInterface));
3816 return JVMTI_ERROR_NONE;
3817 } /* end GetJNIFunctionTable */
3818
3819
3820 //
3821 // Event Management functions
3822 //
3823
3824 jvmtiError
3825 JvmtiEnv::GenerateEvents(jvmtiEvent event_type) {
3826 // can only generate two event types
3827 if (event_type != JVMTI_EVENT_COMPILED_METHOD_LOAD &&
3828 event_type != JVMTI_EVENT_DYNAMIC_CODE_GENERATED) {
3829 return JVMTI_ERROR_ILLEGAL_ARGUMENT;
3830 }
3831
3832 // for compiled_method_load events we must check that the environment
3833 // has the can_generate_compiled_method_load_events capability.
3834 if (event_type == JVMTI_EVENT_COMPILED_METHOD_LOAD) {
3835 if (get_capabilities()->can_generate_compiled_method_load_events == 0) {
3836 return JVMTI_ERROR_MUST_POSSESS_CAPABILITY;
3837 }
3838 return JvmtiCodeBlobEvents::generate_compiled_method_load_events(this);
3839 } else {
3840 return JvmtiCodeBlobEvents::generate_dynamic_code_events(this);
3841 }
3842
3843 } /* end GenerateEvents */
3844
3845
3846 //
3847 // Extension Mechanism functions
3848 //
3849
3850 // extension_count_ptr - pre-checked for NULL
3851 // extensions - pre-checked for NULL
3852 jvmtiError
3853 JvmtiEnv::GetExtensionFunctions(jint* extension_count_ptr, jvmtiExtensionFunctionInfo** extensions) {
3854 return JvmtiExtensions::get_functions(this, extension_count_ptr, extensions);
3855 } /* end GetExtensionFunctions */
3856
3857
3858 // extension_count_ptr - pre-checked for NULL
3859 // extensions - pre-checked for NULL
3860 jvmtiError
3861 JvmtiEnv::GetExtensionEvents(jint* extension_count_ptr, jvmtiExtensionEventInfo** extensions) {
3862 return JvmtiExtensions::get_events(this, extension_count_ptr, extensions);
3863 } /* end GetExtensionEvents */
3864
3865
3866 // callback - NULL is a valid value, must be checked
3867 jvmtiError
3868 JvmtiEnv::SetExtensionEventCallback(jint extension_event_index, jvmtiExtensionEvent callback) {
3869 return JvmtiExtensions::set_event_callback(this, extension_event_index, callback);
3870 } /* end SetExtensionEventCallback */
3871
3872 //
3873 // Timers functions
3874 //
3875
3876 // info_ptr - pre-checked for NULL
3877 jvmtiError
3878 JvmtiEnv::GetCurrentThreadCpuTimerInfo(jvmtiTimerInfo* info_ptr) {
3879 os::current_thread_cpu_time_info(info_ptr);
3880 return JVMTI_ERROR_NONE;
3881 } /* end GetCurrentThreadCpuTimerInfo */
3882
3883
3884 // nanos_ptr - pre-checked for NULL
3885 jvmtiError
3886 JvmtiEnv::GetCurrentThreadCpuTime(jlong* nanos_ptr) {
3887 Thread* thread = Thread::current();
3888
3889 // Surprisingly the GetCurrentThreadCpuTime is used by non-JavaThread's.
3890 if (thread->is_Java_thread()) {
3891 if (JavaThread::cast(thread)->is_vthread_mounted()) {
3892 // No support for virtual threads (yet).
3893 return JVMTI_ERROR_UNSUPPORTED_OPERATION;
3894 }
3895 }
3896 *nanos_ptr = os::current_thread_cpu_time();
3897 return JVMTI_ERROR_NONE;
3898 } /* end GetCurrentThreadCpuTime */
3899
3900
3901 // info_ptr - pre-checked for NULL
3902 jvmtiError
3903 JvmtiEnv::GetThreadCpuTimerInfo(jvmtiTimerInfo* info_ptr) {
3904 os::thread_cpu_time_info(info_ptr);
3905 return JVMTI_ERROR_NONE;
3906 } /* end GetThreadCpuTimerInfo */
3907
3908
3909 // nanos_ptr - pre-checked for NULL
3910 jvmtiError
3911 JvmtiEnv::GetThreadCpuTime(jthread thread, jlong* nanos_ptr) {
3912 JavaThread* current_thread = JavaThread::current();
3913 ThreadsListHandle tlh(current_thread);
3914 JavaThread* java_thread = NULL;
3915 oop thread_oop = NULL;
3916
3917 jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, &java_thread, &thread_oop);
3918
3919 if (thread_oop != NULL && java_lang_VirtualThread::is_instance(thread_oop)) {
3920 // No support for virtual threads (yet).
3921 return JVMTI_ERROR_UNSUPPORTED_OPERATION;
3922 }
3923 if (err != JVMTI_ERROR_NONE) {
3924 return err;
3925 }
3926 NULL_CHECK(nanos_ptr, JVMTI_ERROR_NULL_POINTER);
3927
3928 *nanos_ptr = os::thread_cpu_time(java_thread);
3929 return JVMTI_ERROR_NONE;
3930 } /* end GetThreadCpuTime */
3931
3932
3933 // info_ptr - pre-checked for NULL
3934 jvmtiError
3935 JvmtiEnv::GetTimerInfo(jvmtiTimerInfo* info_ptr) {
3936 os::javaTimeNanos_info(info_ptr);
3937 return JVMTI_ERROR_NONE;
3938 } /* end GetTimerInfo */
3939
3940
3941 // nanos_ptr - pre-checked for NULL
3942 jvmtiError
3943 JvmtiEnv::GetTime(jlong* nanos_ptr) {
3944 *nanos_ptr = os::javaTimeNanos();
3945 return JVMTI_ERROR_NONE;
3946 } /* end GetTime */
3947
3948
3949 // processor_count_ptr - pre-checked for NULL
3950 jvmtiError
3951 JvmtiEnv::GetAvailableProcessors(jint* processor_count_ptr) {
3952 *processor_count_ptr = os::active_processor_count();
3953 return JVMTI_ERROR_NONE;
3954 } /* end GetAvailableProcessors */
3955
3956 jvmtiError
3957 JvmtiEnv::SetHeapSamplingInterval(jint sampling_interval) {
3958 if (sampling_interval < 0) {
3959 return JVMTI_ERROR_ILLEGAL_ARGUMENT;
3960 }
3961 ThreadHeapSampler::set_sampling_interval(sampling_interval);
3962 return JVMTI_ERROR_NONE;
3963 } /* end SetHeapSamplingInterval */
3964
3965 //
3966 // System Properties functions
3967 //
3968
3969 // count_ptr - pre-checked for NULL
3970 // property_ptr - pre-checked for NULL
3971 jvmtiError
3972 JvmtiEnv::GetSystemProperties(jint* count_ptr, char*** property_ptr) {
3973 jvmtiError err = JVMTI_ERROR_NONE;
3974
3975 // Get the number of readable properties.
3976 *count_ptr = Arguments::PropertyList_readable_count(Arguments::system_properties());
3977
3978 // Allocate memory to hold the exact number of readable properties.
3979 err = allocate(*count_ptr * sizeof(char *), (unsigned char **)property_ptr);
3980 if (err != JVMTI_ERROR_NONE) {
3981 return err;
3982 }
3983 int readable_count = 0;
3984 // Loop through the system properties until all the readable properties are found.
3985 for (SystemProperty* p = Arguments::system_properties(); p != NULL && readable_count < *count_ptr; p = p->next()) {
3986 if (p->readable()) {
3987 const char *key = p->key();
3988 char **tmp_value = *property_ptr+readable_count;
3989 readable_count++;
3990 err = allocate((strlen(key)+1) * sizeof(char), (unsigned char**)tmp_value);
3991 if (err == JVMTI_ERROR_NONE) {
3992 strcpy(*tmp_value, key);
3993 } else {
3994 // clean up previously allocated memory.
3995 for (int j = 0; j < readable_count; j++) {
3996 Deallocate((unsigned char*)*property_ptr+j);
3997 }
3998 Deallocate((unsigned char*)property_ptr);
3999 break;
4000 }
4001 }
4002 }
4003 assert(err != JVMTI_ERROR_NONE || readable_count == *count_ptr, "Bad readable property count");
4004 return err;
4005 } /* end GetSystemProperties */
4006
4007
4008 // property - pre-checked for NULL
4009 // value_ptr - pre-checked for NULL
4010 jvmtiError
4011 JvmtiEnv::GetSystemProperty(const char* property, char** value_ptr) {
4012 jvmtiError err = JVMTI_ERROR_NONE;
4013 const char *value;
4014
4015 // Return JVMTI_ERROR_NOT_AVAILABLE if property is not readable or doesn't exist.
4016 value = Arguments::PropertyList_get_readable_value(Arguments::system_properties(), property);
4017 if (value == NULL) {
4018 err = JVMTI_ERROR_NOT_AVAILABLE;
4019 } else {
4020 err = allocate((strlen(value)+1) * sizeof(char), (unsigned char **)value_ptr);
4021 if (err == JVMTI_ERROR_NONE) {
4022 strcpy(*value_ptr, value);
4023 }
4024 }
4025 return err;
4026 } /* end GetSystemProperty */
4027
4028
4029 // property - pre-checked for NULL
4030 // value - NULL is a valid value, must be checked
4031 jvmtiError
4032 JvmtiEnv::SetSystemProperty(const char* property, const char* value_ptr) {
4033 for (SystemProperty* p = Arguments::system_properties(); p != NULL; p = p->next()) {
4034 if (strcmp(property, p->key()) == 0) {
4035 if (p->writeable()) {
4036 if (p->set_value(value_ptr, AllocFailStrategy::RETURN_NULL)) {
4037 return JVMTI_ERROR_NONE;
4038 } else {
4039 return JVMTI_ERROR_OUT_OF_MEMORY;
4040 }
4041 } else {
4042 // We found a property, but it's not writeable
4043 return JVMTI_ERROR_NOT_AVAILABLE;
4044 }
4045 }
4046 }
4047
4048 // We cannot find a property of the given name
4049 return JVMTI_ERROR_NOT_AVAILABLE;
4050 } /* end SetSystemProperty */